| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_OBJECTS_H_ |
| #define V8_OBJECTS_H_ |
| |
| #include <iosfwd> |
| #include <memory> |
| |
| #include "src/assert-scope.h" |
| #include "src/bailout-reason.h" |
| #include "src/base/bits.h" |
| #include "src/base/flags.h" |
| #include "src/builtins/builtins-definitions.h" |
| #include "src/checks.h" |
| #include "src/elements-kind.h" |
| #include "src/field-index.h" |
| #include "src/flags.h" |
| #include "src/interpreter/bytecode-register.h" |
| #include "src/messages.h" |
| #include "src/property-details.h" |
| #include "src/unicode-decoder.h" |
| #include "src/unicode.h" |
| |
| #if V8_TARGET_ARCH_ARM |
| #include "src/arm/constants-arm.h" // NOLINT |
| #elif V8_TARGET_ARCH_ARM64 |
| #include "src/arm64/constants-arm64.h" // NOLINT |
| #elif V8_TARGET_ARCH_MIPS |
| #include "src/mips/constants-mips.h" // NOLINT |
| #elif V8_TARGET_ARCH_MIPS64 |
| #include "src/mips64/constants-mips64.h" // NOLINT |
| #elif V8_TARGET_ARCH_PPC |
| #include "src/ppc/constants-ppc.h" // NOLINT |
| #elif V8_TARGET_ARCH_S390 |
| #include "src/s390/constants-s390.h" // NOLINT |
| #endif |
| |
| // Has to be the last include (doesn't have include guards): |
| #include "src/objects/object-macros.h" |
| |
| // |
| // Most object types in the V8 JavaScript are described in this file. |
| // |
| // Inheritance hierarchy: |
| // - Object |
| // - Smi (immediate small integer) |
| // - HeapObject (superclass for everything allocated in the heap) |
| // - JSReceiver (suitable for property access) |
| // - JSObject |
| // - JSArray |
| // - JSArrayBuffer |
| // - JSArrayBufferView |
| // - JSTypedArray |
| // - JSDataView |
| // - JSBoundFunction |
| // - JSCollection |
| // - JSSet |
| // - JSMap |
| // - JSStringIterator |
| // - JSSetIterator |
| // - JSMapIterator |
| // - JSWeakCollection |
| // - JSWeakMap |
| // - JSWeakSet |
| // - JSRegExp |
| // - JSFunction |
| // - JSGeneratorObject |
| // - JSGlobalObject |
| // - JSGlobalProxy |
| // - JSValue |
| // - JSDate |
| // - JSMessageObject |
| // - JSModuleNamespace |
| // - WasmInstanceObject |
| // - WasmMemoryObject |
| // - WasmModuleObject |
| // - WasmTableObject |
| // - JSProxy |
| // - FixedArrayBase |
| // - ByteArray |
| // - BytecodeArray |
| // - FixedArray |
| // - DescriptorArray |
| // - FrameArray |
| // - HashTable |
| // - Dictionary |
| // - StringTable |
| // - StringSet |
| // - CompilationCacheTable |
| // - MapCache |
| // - OrderedHashTable |
| // - OrderedHashSet |
| // - OrderedHashMap |
| // - Context |
| // - FeedbackMetadata |
| // - TemplateList |
| // - TransitionArray |
| // - ScopeInfo |
| // - ModuleInfo |
| // - ScriptContextTable |
| // - WeakFixedArray |
| // - WasmSharedModuleData |
| // - WasmCompiledModule |
| // - FixedDoubleArray |
| // - Name |
| // - String |
| // - SeqString |
| // - SeqOneByteString |
| // - SeqTwoByteString |
| // - SlicedString |
| // - ConsString |
| // - ThinString |
| // - ExternalString |
| // - ExternalOneByteString |
| // - ExternalTwoByteString |
| // - InternalizedString |
| // - SeqInternalizedString |
| // - SeqOneByteInternalizedString |
| // - SeqTwoByteInternalizedString |
| // - ConsInternalizedString |
| // - ExternalInternalizedString |
| // - ExternalOneByteInternalizedString |
| // - ExternalTwoByteInternalizedString |
| // - Symbol |
| // - HeapNumber |
| // - BigInt |
| // - Cell |
| // - PropertyCell |
| // - PropertyArray |
| // - Code |
| // - AbstractCode, a wrapper around Code or BytecodeArray |
| // - Map |
| // - Oddball |
| // - Foreign |
| // - SmallOrderedHashTable |
| // - SmallOrderedHashMap |
| // - SmallOrderedHashSet |
| // - SharedFunctionInfo |
| // - Struct |
| // - AccessorInfo |
| // - PromiseResolveThenableJobInfo |
| // - PromiseReactionJobInfo |
| // - PromiseCapability |
| // - AccessorPair |
| // - AccessCheckInfo |
| // - InterceptorInfo |
| // - CallHandlerInfo |
| // - EnumCache |
| // - TemplateInfo |
| // - FunctionTemplateInfo |
| // - ObjectTemplateInfo |
| // - Script |
| // - DebugInfo |
| // - BreakPoint |
| // - BreakPointInfo |
| // - StackFrameInfo |
| // - SourcePositionTableWithFrameCache |
| // - CodeCache |
| // - PrototypeInfo |
| // - Module |
| // - ModuleInfoEntry |
| // - PreParsedScopeData |
| // - WeakCell |
| // - FeedbackVector |
| // |
| // Formats of Object*: |
| // Smi: [31 bit signed int] 0 |
| // HeapObject: [32 bit direct pointer] (4 byte aligned) | 01 |
| |
| namespace v8 { |
| namespace internal { |
| |
| struct InliningPosition; |
| class PropertyDescriptorObject; |
| |
| enum KeyedAccessStoreMode { |
| STANDARD_STORE, |
| STORE_TRANSITION_TO_OBJECT, |
| STORE_TRANSITION_TO_DOUBLE, |
| STORE_AND_GROW_NO_TRANSITION, |
| STORE_AND_GROW_TRANSITION_TO_OBJECT, |
| STORE_AND_GROW_TRANSITION_TO_DOUBLE, |
| STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS, |
| STORE_NO_TRANSITION_HANDLE_COW |
| }; |
| |
| enum MutableMode { |
| MUTABLE, |
| IMMUTABLE |
| }; |
| |
| |
| static inline bool IsTransitionStoreMode(KeyedAccessStoreMode store_mode) { |
| return store_mode == STORE_TRANSITION_TO_OBJECT || |
| store_mode == STORE_TRANSITION_TO_DOUBLE || |
| store_mode == STORE_AND_GROW_TRANSITION_TO_OBJECT || |
| store_mode == STORE_AND_GROW_TRANSITION_TO_DOUBLE; |
| } |
| |
| |
| static inline KeyedAccessStoreMode GetNonTransitioningStoreMode( |
| KeyedAccessStoreMode store_mode) { |
| if (store_mode >= STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS) { |
| return store_mode; |
| } |
| if (store_mode >= STORE_AND_GROW_NO_TRANSITION) { |
| return STORE_AND_GROW_NO_TRANSITION; |
| } |
| return STANDARD_STORE; |
| } |
| |
| |
| static inline bool IsGrowStoreMode(KeyedAccessStoreMode store_mode) { |
| return store_mode >= STORE_AND_GROW_NO_TRANSITION && |
| store_mode <= STORE_AND_GROW_TRANSITION_TO_DOUBLE; |
| } |
| |
| |
| enum IcCheckType { ELEMENT, PROPERTY }; |
| |
| |
| // SKIP_WRITE_BARRIER skips the write barrier. |
| // UPDATE_WEAK_WRITE_BARRIER skips the marking part of the write barrier and |
| // only performs the generational part. |
| // UPDATE_WRITE_BARRIER is doing the full barrier, marking and generational. |
| enum WriteBarrierMode { |
| SKIP_WRITE_BARRIER, |
| UPDATE_WEAK_WRITE_BARRIER, |
| UPDATE_WRITE_BARRIER |
| }; |
| |
| |
| // PropertyNormalizationMode is used to specify whether to keep |
| // inobject properties when normalizing properties of a JSObject. |
| enum PropertyNormalizationMode { |
| CLEAR_INOBJECT_PROPERTIES, |
| KEEP_INOBJECT_PROPERTIES |
| }; |
| |
| |
| // Indicates whether transitions can be added to a source map or not. |
| enum TransitionFlag { |
| INSERT_TRANSITION, |
| OMIT_TRANSITION |
| }; |
| |
| |
| // Indicates whether the transition is simple: the target map of the transition |
| // either extends the current map with a new property, or it modifies the |
| // property that was added last to the current map. |
| enum SimpleTransitionFlag { |
| SIMPLE_PROPERTY_TRANSITION, |
| PROPERTY_TRANSITION, |
| SPECIAL_TRANSITION |
| }; |
| |
| // Indicates whether we are only interested in the descriptors of a particular |
| // map, or in all descriptors in the descriptor array. |
| enum DescriptorFlag { |
| ALL_DESCRIPTORS, |
| OWN_DESCRIPTORS |
| }; |
| |
| // Instance size sentinel for objects of variable size. |
| const int kVariableSizeSentinel = 0; |
| |
| // We may store the unsigned bit field as signed Smi value and do not |
| // use the sign bit. |
| const int kStubMajorKeyBits = 8; |
| const int kStubMinorKeyBits = kSmiValueSize - kStubMajorKeyBits - 1; |
| |
| // All Maps have a field instance_type containing a InstanceType. |
| // It describes the type of the instances. |
| // |
| // As an example, a JavaScript object is a heap object and its map |
| // instance_type is JS_OBJECT_TYPE. |
| // |
| // The names of the string instance types are intended to systematically |
| // mirror their encoding in the instance_type field of the map. The default |
| // encoding is considered TWO_BYTE. It is not mentioned in the name. ONE_BYTE |
| // encoding is mentioned explicitly in the name. Likewise, the default |
| // representation is considered sequential. It is not mentioned in the |
| // name. The other representations (e.g. CONS, EXTERNAL) are explicitly |
| // mentioned. Finally, the string is either a STRING_TYPE (if it is a normal |
| // string) or a INTERNALIZED_STRING_TYPE (if it is a internalized string). |
| // |
| // NOTE: The following things are some that depend on the string types having |
| // instance_types that are less than those of all other types: |
| // HeapObject::Size, HeapObject::IterateBody, the typeof operator, and |
| // Object::IsString. |
| // |
| // NOTE: Everything following JS_VALUE_TYPE is considered a |
| // JSObject for GC purposes. The first four entries here have typeof |
| // 'object', whereas JS_FUNCTION_TYPE has typeof 'function'. |
| #define INSTANCE_TYPE_LIST(V) \ |
| V(INTERNALIZED_STRING_TYPE) \ |
| V(EXTERNAL_INTERNALIZED_STRING_TYPE) \ |
| V(ONE_BYTE_INTERNALIZED_STRING_TYPE) \ |
| V(EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE) \ |
| V(EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE) \ |
| V(SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE) \ |
| V(STRING_TYPE) \ |
| V(CONS_STRING_TYPE) \ |
| V(EXTERNAL_STRING_TYPE) \ |
| V(SLICED_STRING_TYPE) \ |
| V(THIN_STRING_TYPE) \ |
| V(ONE_BYTE_STRING_TYPE) \ |
| V(CONS_ONE_BYTE_STRING_TYPE) \ |
| V(EXTERNAL_ONE_BYTE_STRING_TYPE) \ |
| V(SLICED_ONE_BYTE_STRING_TYPE) \ |
| V(THIN_ONE_BYTE_STRING_TYPE) \ |
| V(EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE) \ |
| V(SHORT_EXTERNAL_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_ONE_BYTE_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE) \ |
| \ |
| V(SYMBOL_TYPE) \ |
| V(HEAP_NUMBER_TYPE) \ |
| V(BIGINT_TYPE) \ |
| V(ODDBALL_TYPE) \ |
| \ |
| V(MAP_TYPE) \ |
| V(CODE_TYPE) \ |
| V(MUTABLE_HEAP_NUMBER_TYPE) \ |
| V(FOREIGN_TYPE) \ |
| V(BYTE_ARRAY_TYPE) \ |
| V(BYTECODE_ARRAY_TYPE) \ |
| V(FREE_SPACE_TYPE) \ |
| \ |
| V(FIXED_INT8_ARRAY_TYPE) \ |
| V(FIXED_UINT8_ARRAY_TYPE) \ |
| V(FIXED_INT16_ARRAY_TYPE) \ |
| V(FIXED_UINT16_ARRAY_TYPE) \ |
| V(FIXED_INT32_ARRAY_TYPE) \ |
| V(FIXED_UINT32_ARRAY_TYPE) \ |
| V(FIXED_FLOAT32_ARRAY_TYPE) \ |
| V(FIXED_FLOAT64_ARRAY_TYPE) \ |
| V(FIXED_UINT8_CLAMPED_ARRAY_TYPE) \ |
| \ |
| V(FIXED_DOUBLE_ARRAY_TYPE) \ |
| V(FILLER_TYPE) \ |
| \ |
| V(ACCESSOR_INFO_TYPE) \ |
| V(ACCESSOR_PAIR_TYPE) \ |
| V(ACCESS_CHECK_INFO_TYPE) \ |
| V(INTERCEPTOR_INFO_TYPE) \ |
| V(FUNCTION_TEMPLATE_INFO_TYPE) \ |
| V(OBJECT_TEMPLATE_INFO_TYPE) \ |
| V(ALLOCATION_SITE_TYPE) \ |
| V(ALLOCATION_MEMENTO_TYPE) \ |
| V(SCRIPT_TYPE) \ |
| V(ALIASED_ARGUMENTS_ENTRY_TYPE) \ |
| V(PROMISE_RESOLVE_THENABLE_JOB_INFO_TYPE) \ |
| V(PROMISE_REACTION_JOB_INFO_TYPE) \ |
| V(PROMISE_CAPABILITY_TYPE) \ |
| V(DEBUG_INFO_TYPE) \ |
| V(STACK_FRAME_INFO_TYPE) \ |
| V(PROTOTYPE_INFO_TYPE) \ |
| V(TUPLE2_TYPE) \ |
| V(TUPLE3_TYPE) \ |
| V(CONTEXT_EXTENSION_TYPE) \ |
| V(MODULE_TYPE) \ |
| V(MODULE_INFO_ENTRY_TYPE) \ |
| V(ASYNC_GENERATOR_REQUEST_TYPE) \ |
| V(FIXED_ARRAY_TYPE) \ |
| V(HASH_TABLE_TYPE) \ |
| V(FEEDBACK_VECTOR_TYPE) \ |
| V(TRANSITION_ARRAY_TYPE) \ |
| V(PROPERTY_ARRAY_TYPE) \ |
| V(SHARED_FUNCTION_INFO_TYPE) \ |
| V(CELL_TYPE) \ |
| V(WEAK_CELL_TYPE) \ |
| V(PROPERTY_CELL_TYPE) \ |
| V(SMALL_ORDERED_HASH_MAP_TYPE) \ |
| V(SMALL_ORDERED_HASH_SET_TYPE) \ |
| \ |
| V(JS_PROXY_TYPE) \ |
| V(JS_GLOBAL_OBJECT_TYPE) \ |
| V(JS_GLOBAL_PROXY_TYPE) \ |
| V(JS_MODULE_NAMESPACE_TYPE) \ |
| V(JS_SPECIAL_API_OBJECT_TYPE) \ |
| V(JS_VALUE_TYPE) \ |
| V(JS_MESSAGE_OBJECT_TYPE) \ |
| V(JS_DATE_TYPE) \ |
| V(JS_API_OBJECT_TYPE) \ |
| V(JS_OBJECT_TYPE) \ |
| V(JS_ARGUMENTS_TYPE) \ |
| V(JS_CONTEXT_EXTENSION_OBJECT_TYPE) \ |
| V(JS_GENERATOR_OBJECT_TYPE) \ |
| V(JS_ASYNC_GENERATOR_OBJECT_TYPE) \ |
| V(JS_ARRAY_TYPE) \ |
| V(JS_ARRAY_BUFFER_TYPE) \ |
| V(JS_TYPED_ARRAY_TYPE) \ |
| V(JS_DATA_VIEW_TYPE) \ |
| V(JS_SET_TYPE) \ |
| V(JS_MAP_TYPE) \ |
| V(JS_SET_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_SET_VALUE_ITERATOR_TYPE) \ |
| V(JS_MAP_KEY_ITERATOR_TYPE) \ |
| V(JS_MAP_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_MAP_VALUE_ITERATOR_TYPE) \ |
| V(JS_WEAK_MAP_TYPE) \ |
| V(JS_WEAK_SET_TYPE) \ |
| V(JS_PROMISE_TYPE) \ |
| V(JS_REGEXP_TYPE) \ |
| V(JS_ERROR_TYPE) \ |
| V(JS_ASYNC_FROM_SYNC_ITERATOR_TYPE) \ |
| V(JS_STRING_ITERATOR_TYPE) \ |
| \ |
| ARRAY_ITERATOR_TYPE_LIST(V) \ |
| \ |
| V(WASM_INSTANCE_TYPE) \ |
| V(WASM_MEMORY_TYPE) \ |
| V(WASM_MODULE_TYPE) \ |
| V(WASM_TABLE_TYPE) \ |
| V(JS_BOUND_FUNCTION_TYPE) \ |
| V(JS_FUNCTION_TYPE) |
| |
| // Since string types are not consecutive, this macro is used to |
| // iterate over them. |
| #define STRING_TYPE_LIST(V) \ |
| V(STRING_TYPE, kVariableSizeSentinel, string, String) \ |
| V(ONE_BYTE_STRING_TYPE, kVariableSizeSentinel, one_byte_string, \ |
| OneByteString) \ |
| V(CONS_STRING_TYPE, ConsString::kSize, cons_string, ConsString) \ |
| V(CONS_ONE_BYTE_STRING_TYPE, ConsString::kSize, cons_one_byte_string, \ |
| ConsOneByteString) \ |
| V(SLICED_STRING_TYPE, SlicedString::kSize, sliced_string, SlicedString) \ |
| V(SLICED_ONE_BYTE_STRING_TYPE, SlicedString::kSize, sliced_one_byte_string, \ |
| SlicedOneByteString) \ |
| V(EXTERNAL_STRING_TYPE, ExternalTwoByteString::kSize, external_string, \ |
| ExternalString) \ |
| V(EXTERNAL_ONE_BYTE_STRING_TYPE, ExternalOneByteString::kSize, \ |
| external_one_byte_string, ExternalOneByteString) \ |
| V(EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE, ExternalTwoByteString::kSize, \ |
| external_string_with_one_byte_data, ExternalStringWithOneByteData) \ |
| V(SHORT_EXTERNAL_STRING_TYPE, ExternalTwoByteString::kShortSize, \ |
| short_external_string, ShortExternalString) \ |
| V(SHORT_EXTERNAL_ONE_BYTE_STRING_TYPE, ExternalOneByteString::kShortSize, \ |
| short_external_one_byte_string, ShortExternalOneByteString) \ |
| V(SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE, \ |
| ExternalTwoByteString::kShortSize, \ |
| short_external_string_with_one_byte_data, \ |
| ShortExternalStringWithOneByteData) \ |
| \ |
| V(INTERNALIZED_STRING_TYPE, kVariableSizeSentinel, internalized_string, \ |
| InternalizedString) \ |
| V(ONE_BYTE_INTERNALIZED_STRING_TYPE, kVariableSizeSentinel, \ |
| one_byte_internalized_string, OneByteInternalizedString) \ |
| V(EXTERNAL_INTERNALIZED_STRING_TYPE, ExternalTwoByteString::kSize, \ |
| external_internalized_string, ExternalInternalizedString) \ |
| V(EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE, ExternalOneByteString::kSize, \ |
| external_one_byte_internalized_string, ExternalOneByteInternalizedString) \ |
| V(EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE, \ |
| ExternalTwoByteString::kSize, \ |
| external_internalized_string_with_one_byte_data, \ |
| ExternalInternalizedStringWithOneByteData) \ |
| V(SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE, \ |
| ExternalTwoByteString::kShortSize, short_external_internalized_string, \ |
| ShortExternalInternalizedString) \ |
| V(SHORT_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE, \ |
| ExternalOneByteString::kShortSize, \ |
| short_external_one_byte_internalized_string, \ |
| ShortExternalOneByteInternalizedString) \ |
| V(SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE, \ |
| ExternalTwoByteString::kShortSize, \ |
| short_external_internalized_string_with_one_byte_data, \ |
| ShortExternalInternalizedStringWithOneByteData) \ |
| V(THIN_STRING_TYPE, ThinString::kSize, thin_string, ThinString) \ |
| V(THIN_ONE_BYTE_STRING_TYPE, ThinString::kSize, thin_one_byte_string, \ |
| ThinOneByteString) |
| |
| #define ARRAY_ITERATOR_TYPE_LIST(V) \ |
| V(JS_TYPED_ARRAY_KEY_ITERATOR_TYPE) \ |
| V(JS_FAST_ARRAY_KEY_ITERATOR_TYPE) \ |
| V(JS_GENERIC_ARRAY_KEY_ITERATOR_TYPE) \ |
| \ |
| V(JS_UINT8_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_INT8_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_UINT16_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_INT16_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_UINT32_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_INT32_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FLOAT32_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FLOAT64_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_UINT8_CLAMPED_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| \ |
| V(JS_FAST_SMI_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_HOLEY_SMI_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_HOLEY_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_DOUBLE_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_HOLEY_DOUBLE_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| V(JS_GENERIC_ARRAY_KEY_VALUE_ITERATOR_TYPE) \ |
| \ |
| V(JS_UINT8_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_INT8_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_UINT16_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_INT16_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_UINT32_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_INT32_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FLOAT32_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FLOAT64_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_UINT8_CLAMPED_ARRAY_VALUE_ITERATOR_TYPE) \ |
| \ |
| V(JS_FAST_SMI_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_HOLEY_SMI_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_HOLEY_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_DOUBLE_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_FAST_HOLEY_DOUBLE_ARRAY_VALUE_ITERATOR_TYPE) \ |
| V(JS_GENERIC_ARRAY_VALUE_ITERATOR_TYPE) |
| |
| // A struct is a simple object a set of object-valued fields. Including an |
| // object type in this causes the compiler to generate most of the boilerplate |
| // code for the class including allocation and garbage collection routines, |
| // casts and predicates. All you need to define is the class, methods and |
| // object verification routines. Easy, no? |
| // |
| // Note that for subtle reasons related to the ordering or numerical values of |
| // type tags, elements in this list have to be added to the INSTANCE_TYPE_LIST |
| // manually. |
| #define STRUCT_LIST(V) \ |
| V(ACCESSOR_INFO, AccessorInfo, accessor_info) \ |
| V(ACCESSOR_PAIR, AccessorPair, accessor_pair) \ |
| V(ACCESS_CHECK_INFO, AccessCheckInfo, access_check_info) \ |
| V(INTERCEPTOR_INFO, InterceptorInfo, interceptor_info) \ |
| V(FUNCTION_TEMPLATE_INFO, FunctionTemplateInfo, function_template_info) \ |
| V(OBJECT_TEMPLATE_INFO, ObjectTemplateInfo, object_template_info) \ |
| V(ALLOCATION_SITE, AllocationSite, allocation_site) \ |
| V(ALLOCATION_MEMENTO, AllocationMemento, allocation_memento) \ |
| V(SCRIPT, Script, script) \ |
| V(ALIASED_ARGUMENTS_ENTRY, AliasedArgumentsEntry, aliased_arguments_entry) \ |
| V(PROMISE_RESOLVE_THENABLE_JOB_INFO, PromiseResolveThenableJobInfo, \ |
| promise_resolve_thenable_job_info) \ |
| V(PROMISE_REACTION_JOB_INFO, PromiseReactionJobInfo, \ |
| promise_reaction_job_info) \ |
| V(PROMISE_CAPABILITY, PromiseCapability, promise_capability) \ |
| V(DEBUG_INFO, DebugInfo, debug_info) \ |
| V(STACK_FRAME_INFO, StackFrameInfo, stack_frame_info) \ |
| V(PROTOTYPE_INFO, PrototypeInfo, prototype_info) \ |
| V(TUPLE2, Tuple2, tuple2) \ |
| V(TUPLE3, Tuple3, tuple3) \ |
| V(CONTEXT_EXTENSION, ContextExtension, context_extension) \ |
| V(MODULE, Module, module) \ |
| V(MODULE_INFO_ENTRY, ModuleInfoEntry, module_info_entry) \ |
| V(ASYNC_GENERATOR_REQUEST, AsyncGeneratorRequest, async_generator_request) |
| |
| // We use the full 8 bits of the instance_type field to encode heap object |
| // instance types. The high-order bit (bit 7) is set if the object is not a |
| // string, and cleared if it is a string. |
| const uint32_t kIsNotStringMask = 0x80; |
| const uint32_t kStringTag = 0x0; |
| const uint32_t kNotStringTag = 0x80; |
| |
| // Bit 6 indicates that the object is an internalized string (if set) or not. |
| // Bit 7 has to be clear as well. |
| const uint32_t kIsNotInternalizedMask = 0x40; |
| const uint32_t kNotInternalizedTag = 0x40; |
| const uint32_t kInternalizedTag = 0x0; |
| |
| // If bit 7 is clear then bit 3 indicates whether the string consists of |
| // two-byte characters or one-byte characters. |
| const uint32_t kStringEncodingMask = 0x8; |
| const uint32_t kTwoByteStringTag = 0x0; |
| const uint32_t kOneByteStringTag = 0x8; |
| |
| // If bit 7 is clear, the low-order 3 bits indicate the representation |
| // of the string. |
| const uint32_t kStringRepresentationMask = 0x07; |
| enum StringRepresentationTag { |
| kSeqStringTag = 0x0, |
| kConsStringTag = 0x1, |
| kExternalStringTag = 0x2, |
| kSlicedStringTag = 0x3, |
| kThinStringTag = 0x5 |
| }; |
| const uint32_t kIsIndirectStringMask = 0x1; |
| const uint32_t kIsIndirectStringTag = 0x1; |
| STATIC_ASSERT((kSeqStringTag & kIsIndirectStringMask) == 0); // NOLINT |
| STATIC_ASSERT((kExternalStringTag & kIsIndirectStringMask) == 0); // NOLINT |
| STATIC_ASSERT((kConsStringTag & |
| kIsIndirectStringMask) == kIsIndirectStringTag); // NOLINT |
| STATIC_ASSERT((kSlicedStringTag & |
| kIsIndirectStringMask) == kIsIndirectStringTag); // NOLINT |
| STATIC_ASSERT((kThinStringTag & kIsIndirectStringMask) == kIsIndirectStringTag); |
| |
| // If bit 7 is clear, then bit 4 indicates whether this two-byte |
| // string actually contains one byte data. |
| const uint32_t kOneByteDataHintMask = 0x10; |
| const uint32_t kOneByteDataHintTag = 0x10; |
| |
| // If bit 7 is clear and string representation indicates an external string, |
| // then bit 5 indicates whether the data pointer is cached. |
| const uint32_t kShortExternalStringMask = 0x20; |
| const uint32_t kShortExternalStringTag = 0x20; |
| |
| // A ConsString with an empty string as the right side is a candidate |
| // for being shortcut by the garbage collector. We don't allocate any |
| // non-flat internalized strings, so we do not shortcut them thereby |
| // avoiding turning internalized strings into strings. The bit-masks |
| // below contain the internalized bit as additional safety. |
| // See heap.cc, mark-compact.cc and objects-visiting.cc. |
| const uint32_t kShortcutTypeMask = |
| kIsNotStringMask | |
| kIsNotInternalizedMask | |
| kStringRepresentationMask; |
| const uint32_t kShortcutTypeTag = kConsStringTag | kNotInternalizedTag; |
| |
| static inline bool IsShortcutCandidate(int type) { |
| return ((type & kShortcutTypeMask) == kShortcutTypeTag); |
| } |
| |
| enum InstanceType : uint8_t { |
| // String types. |
| INTERNALIZED_STRING_TYPE = kTwoByteStringTag | kSeqStringTag | |
| kInternalizedTag, // FIRST_PRIMITIVE_TYPE |
| ONE_BYTE_INTERNALIZED_STRING_TYPE = |
| kOneByteStringTag | kSeqStringTag | kInternalizedTag, |
| EXTERNAL_INTERNALIZED_STRING_TYPE = |
| kTwoByteStringTag | kExternalStringTag | kInternalizedTag, |
| EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE = |
| kOneByteStringTag | kExternalStringTag | kInternalizedTag, |
| EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE = |
| EXTERNAL_INTERNALIZED_STRING_TYPE | kOneByteDataHintTag | |
| kInternalizedTag, |
| SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE = EXTERNAL_INTERNALIZED_STRING_TYPE | |
| kShortExternalStringTag | |
| kInternalizedTag, |
| SHORT_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE = |
| EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE | kShortExternalStringTag | |
| kInternalizedTag, |
| SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE = |
| EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE | |
| kShortExternalStringTag | kInternalizedTag, |
| STRING_TYPE = INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| ONE_BYTE_STRING_TYPE = |
| ONE_BYTE_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag | kNotInternalizedTag, |
| CONS_ONE_BYTE_STRING_TYPE = |
| kOneByteStringTag | kConsStringTag | kNotInternalizedTag, |
| SLICED_STRING_TYPE = |
| kTwoByteStringTag | kSlicedStringTag | kNotInternalizedTag, |
| SLICED_ONE_BYTE_STRING_TYPE = |
| kOneByteStringTag | kSlicedStringTag | kNotInternalizedTag, |
| EXTERNAL_STRING_TYPE = |
| EXTERNAL_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| EXTERNAL_ONE_BYTE_STRING_TYPE = |
| EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE = |
| EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE | |
| kNotInternalizedTag, |
| SHORT_EXTERNAL_STRING_TYPE = |
| SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| SHORT_EXTERNAL_ONE_BYTE_STRING_TYPE = |
| SHORT_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE = |
| SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE | |
| kNotInternalizedTag, |
| THIN_STRING_TYPE = kTwoByteStringTag | kThinStringTag | kNotInternalizedTag, |
| THIN_ONE_BYTE_STRING_TYPE = |
| kOneByteStringTag | kThinStringTag | kNotInternalizedTag, |
| |
| // Non-string names |
| SYMBOL_TYPE = kNotStringTag, // FIRST_NONSTRING_TYPE, LAST_NAME_TYPE |
| |
| // Other primitives (cannot contain non-map-word pointers to heap objects). |
| HEAP_NUMBER_TYPE, |
| BIGINT_TYPE, |
| ODDBALL_TYPE, // LAST_PRIMITIVE_TYPE |
| |
| // Objects allocated in their own spaces (never in new space). |
| MAP_TYPE, |
| CODE_TYPE, |
| |
| // "Data", objects that cannot contain non-map-word pointers to heap |
| // objects. |
| MUTABLE_HEAP_NUMBER_TYPE, |
| FOREIGN_TYPE, |
| BYTE_ARRAY_TYPE, |
| BYTECODE_ARRAY_TYPE, |
| FREE_SPACE_TYPE, |
| FIXED_INT8_ARRAY_TYPE, // FIRST_FIXED_TYPED_ARRAY_TYPE |
| FIXED_UINT8_ARRAY_TYPE, |
| FIXED_INT16_ARRAY_TYPE, |
| FIXED_UINT16_ARRAY_TYPE, |
| FIXED_INT32_ARRAY_TYPE, |
| FIXED_UINT32_ARRAY_TYPE, |
| FIXED_FLOAT32_ARRAY_TYPE, |
| FIXED_FLOAT64_ARRAY_TYPE, |
| FIXED_UINT8_CLAMPED_ARRAY_TYPE, // LAST_FIXED_TYPED_ARRAY_TYPE |
| FIXED_DOUBLE_ARRAY_TYPE, |
| FILLER_TYPE, // LAST_DATA_TYPE |
| |
| // Structs. |
| ACCESSOR_INFO_TYPE, |
| ACCESSOR_PAIR_TYPE, |
| ACCESS_CHECK_INFO_TYPE, |
| INTERCEPTOR_INFO_TYPE, |
| FUNCTION_TEMPLATE_INFO_TYPE, |
| OBJECT_TEMPLATE_INFO_TYPE, |
| ALLOCATION_SITE_TYPE, |
| ALLOCATION_MEMENTO_TYPE, |
| SCRIPT_TYPE, |
| ALIASED_ARGUMENTS_ENTRY_TYPE, |
| PROMISE_RESOLVE_THENABLE_JOB_INFO_TYPE, |
| PROMISE_REACTION_JOB_INFO_TYPE, |
| PROMISE_CAPABILITY_TYPE, |
| DEBUG_INFO_TYPE, |
| STACK_FRAME_INFO_TYPE, |
| PROTOTYPE_INFO_TYPE, |
| TUPLE2_TYPE, |
| TUPLE3_TYPE, |
| CONTEXT_EXTENSION_TYPE, |
| MODULE_TYPE, |
| MODULE_INFO_ENTRY_TYPE, |
| ASYNC_GENERATOR_REQUEST_TYPE, |
| FIXED_ARRAY_TYPE, |
| HASH_TABLE_TYPE, |
| FEEDBACK_VECTOR_TYPE, |
| TRANSITION_ARRAY_TYPE, |
| PROPERTY_ARRAY_TYPE, |
| SHARED_FUNCTION_INFO_TYPE, |
| CELL_TYPE, |
| WEAK_CELL_TYPE, |
| PROPERTY_CELL_TYPE, |
| SMALL_ORDERED_HASH_MAP_TYPE, |
| SMALL_ORDERED_HASH_SET_TYPE, |
| |
| // All the following types are subtypes of JSReceiver, which corresponds to |
| // objects in the JS sense. The first and the last type in this range are |
| // the two forms of function. This organization enables using the same |
| // compares for checking the JS_RECEIVER and the NONCALLABLE_JS_OBJECT range. |
| JS_PROXY_TYPE, // FIRST_JS_RECEIVER_TYPE |
| JS_GLOBAL_OBJECT_TYPE, // FIRST_JS_OBJECT_TYPE |
| JS_GLOBAL_PROXY_TYPE, |
| JS_MODULE_NAMESPACE_TYPE, |
| // Like JS_API_OBJECT_TYPE, but requires access checks and/or has |
| // interceptors. |
| JS_SPECIAL_API_OBJECT_TYPE, // LAST_SPECIAL_RECEIVER_TYPE |
| JS_VALUE_TYPE, // LAST_CUSTOM_ELEMENTS_RECEIVER |
| JS_MESSAGE_OBJECT_TYPE, |
| JS_DATE_TYPE, |
| // Like JS_OBJECT_TYPE, but created from API function. |
| JS_API_OBJECT_TYPE, |
| JS_OBJECT_TYPE, |
| JS_ARGUMENTS_TYPE, |
| JS_CONTEXT_EXTENSION_OBJECT_TYPE, |
| JS_GENERATOR_OBJECT_TYPE, |
| JS_ASYNC_GENERATOR_OBJECT_TYPE, |
| JS_ARRAY_TYPE, |
| JS_ARRAY_BUFFER_TYPE, |
| JS_TYPED_ARRAY_TYPE, |
| JS_DATA_VIEW_TYPE, |
| JS_SET_TYPE, |
| JS_MAP_TYPE, |
| JS_SET_KEY_VALUE_ITERATOR_TYPE, |
| JS_SET_VALUE_ITERATOR_TYPE, |
| JS_MAP_KEY_ITERATOR_TYPE, |
| JS_MAP_KEY_VALUE_ITERATOR_TYPE, |
| JS_MAP_VALUE_ITERATOR_TYPE, |
| JS_WEAK_MAP_TYPE, |
| JS_WEAK_SET_TYPE, |
| JS_PROMISE_TYPE, |
| JS_REGEXP_TYPE, |
| JS_ERROR_TYPE, |
| JS_ASYNC_FROM_SYNC_ITERATOR_TYPE, |
| JS_STRING_ITERATOR_TYPE, |
| |
| #define ARRAY_ITERATOR_TYPE(type) type, |
| ARRAY_ITERATOR_TYPE_LIST(ARRAY_ITERATOR_TYPE) |
| #undef ARRAY_ITERATOR_TYPE |
| |
| WASM_INSTANCE_TYPE, |
| WASM_MEMORY_TYPE, |
| WASM_MODULE_TYPE, |
| WASM_TABLE_TYPE, |
| JS_BOUND_FUNCTION_TYPE, |
| JS_FUNCTION_TYPE, // LAST_JS_OBJECT_TYPE, LAST_JS_RECEIVER_TYPE |
| |
| // Pseudo-types |
| FIRST_TYPE = 0x0, |
| LAST_TYPE = JS_FUNCTION_TYPE, |
| FIRST_NAME_TYPE = FIRST_TYPE, |
| LAST_NAME_TYPE = SYMBOL_TYPE, |
| FIRST_UNIQUE_NAME_TYPE = INTERNALIZED_STRING_TYPE, |
| LAST_UNIQUE_NAME_TYPE = SYMBOL_TYPE, |
| FIRST_NONSTRING_TYPE = SYMBOL_TYPE, |
| FIRST_PRIMITIVE_TYPE = FIRST_NAME_TYPE, |
| LAST_PRIMITIVE_TYPE = ODDBALL_TYPE, |
| FIRST_FUNCTION_TYPE = JS_BOUND_FUNCTION_TYPE, |
| LAST_FUNCTION_TYPE = JS_FUNCTION_TYPE, |
| // Boundaries for testing for a fixed typed array. |
| FIRST_FIXED_TYPED_ARRAY_TYPE = FIXED_INT8_ARRAY_TYPE, |
| LAST_FIXED_TYPED_ARRAY_TYPE = FIXED_UINT8_CLAMPED_ARRAY_TYPE, |
| // Boundary for promotion to old space. |
| LAST_DATA_TYPE = FILLER_TYPE, |
| // Boundary for objects represented as JSReceiver (i.e. JSObject or JSProxy). |
| // Note that there is no range for JSObject or JSProxy, since their subtypes |
| // are not continuous in this enum! The enum ranges instead reflect the |
| // external class names, where proxies are treated as either ordinary objects, |
| // or functions. |
| FIRST_JS_RECEIVER_TYPE = JS_PROXY_TYPE, |
| LAST_JS_RECEIVER_TYPE = LAST_TYPE, |
| // Boundaries for testing the types represented as JSObject |
| FIRST_JS_OBJECT_TYPE = JS_GLOBAL_OBJECT_TYPE, |
| LAST_JS_OBJECT_TYPE = LAST_TYPE, |
| // Boundary for testing JSReceivers that need special property lookup handling |
| LAST_SPECIAL_RECEIVER_TYPE = JS_SPECIAL_API_OBJECT_TYPE, |
| // Boundary case for testing JSReceivers that may have elements while having |
| // an empty fixed array as elements backing store. This is true for string |
| // wrappers. |
| LAST_CUSTOM_ELEMENTS_RECEIVER = JS_VALUE_TYPE, |
| |
| FIRST_ARRAY_KEY_ITERATOR_TYPE = JS_TYPED_ARRAY_KEY_ITERATOR_TYPE, |
| LAST_ARRAY_KEY_ITERATOR_TYPE = JS_GENERIC_ARRAY_KEY_ITERATOR_TYPE, |
| |
| FIRST_ARRAY_KEY_VALUE_ITERATOR_TYPE = JS_UINT8_ARRAY_KEY_VALUE_ITERATOR_TYPE, |
| LAST_ARRAY_KEY_VALUE_ITERATOR_TYPE = JS_GENERIC_ARRAY_KEY_VALUE_ITERATOR_TYPE, |
| |
| FIRST_ARRAY_VALUE_ITERATOR_TYPE = JS_UINT8_ARRAY_VALUE_ITERATOR_TYPE, |
| LAST_ARRAY_VALUE_ITERATOR_TYPE = JS_GENERIC_ARRAY_VALUE_ITERATOR_TYPE, |
| |
| FIRST_ARRAY_ITERATOR_TYPE = FIRST_ARRAY_KEY_ITERATOR_TYPE, |
| LAST_ARRAY_ITERATOR_TYPE = LAST_ARRAY_VALUE_ITERATOR_TYPE, |
| |
| FIRST_SET_ITERATOR_TYPE = JS_SET_KEY_VALUE_ITERATOR_TYPE, |
| LAST_SET_ITERATOR_TYPE = JS_SET_VALUE_ITERATOR_TYPE, |
| |
| FIRST_MAP_ITERATOR_TYPE = JS_MAP_KEY_ITERATOR_TYPE, |
| LAST_MAP_ITERATOR_TYPE = JS_MAP_VALUE_ITERATOR_TYPE, |
| }; |
| |
| STATIC_ASSERT(JS_OBJECT_TYPE == Internals::kJSObjectType); |
| STATIC_ASSERT(JS_API_OBJECT_TYPE == Internals::kJSApiObjectType); |
| STATIC_ASSERT(FIRST_NONSTRING_TYPE == Internals::kFirstNonstringType); |
| STATIC_ASSERT(ODDBALL_TYPE == Internals::kOddballType); |
| STATIC_ASSERT(FOREIGN_TYPE == Internals::kForeignType); |
| |
| V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os, |
| InstanceType instance_type); |
| |
| #define FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(V) \ |
| V(BYTECODE_ARRAY_CONSTANT_POOL_SUB_TYPE) \ |
| V(BYTECODE_ARRAY_HANDLER_TABLE_SUB_TYPE) \ |
| V(CODE_STUBS_TABLE_SUB_TYPE) \ |
| V(COMPILATION_CACHE_TABLE_SUB_TYPE) \ |
| V(CONTEXT_SUB_TYPE) \ |
| V(COPY_ON_WRITE_SUB_TYPE) \ |
| V(DEOPTIMIZATION_DATA_SUB_TYPE) \ |
| V(DESCRIPTOR_ARRAY_SUB_TYPE) \ |
| V(EMBEDDED_OBJECT_SUB_TYPE) \ |
| V(ENUM_CACHE_SUB_TYPE) \ |
| V(ENUM_INDICES_CACHE_SUB_TYPE) \ |
| V(DEPENDENT_CODE_SUB_TYPE) \ |
| V(DICTIONARY_ELEMENTS_SUB_TYPE) \ |
| V(DICTIONARY_PROPERTIES_SUB_TYPE) \ |
| V(EMPTY_PROPERTIES_DICTIONARY_SUB_TYPE) \ |
| V(PACKED_ELEMENTS_SUB_TYPE) \ |
| V(FAST_PROPERTIES_SUB_TYPE) \ |
| V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_SUB_TYPE) \ |
| V(HANDLER_TABLE_SUB_TYPE) \ |
| V(JS_COLLECTION_SUB_TYPE) \ |
| V(JS_WEAK_COLLECTION_SUB_TYPE) \ |
| V(NOSCRIPT_SHARED_FUNCTION_INFOS_SUB_TYPE) \ |
| V(NUMBER_STRING_CACHE_SUB_TYPE) \ |
| V(OBJECT_TO_CODE_SUB_TYPE) \ |
| V(OPTIMIZED_CODE_LITERALS_SUB_TYPE) \ |
| V(OPTIMIZED_CODE_MAP_SUB_TYPE) \ |
| V(PROTOTYPE_USERS_SUB_TYPE) \ |
| V(REGEXP_MULTIPLE_CACHE_SUB_TYPE) \ |
| V(RETAINED_MAPS_SUB_TYPE) \ |
| V(SCOPE_INFO_SUB_TYPE) \ |
| V(SCRIPT_LIST_SUB_TYPE) \ |
| V(SERIALIZED_TEMPLATES_SUB_TYPE) \ |
| V(SHARED_FUNCTION_INFOS_SUB_TYPE) \ |
| V(SINGLE_CHARACTER_STRING_CACHE_SUB_TYPE) \ |
| V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_SUB_TYPE) \ |
| V(STRING_SPLIT_CACHE_SUB_TYPE) \ |
| V(STRING_TABLE_SUB_TYPE) \ |
| V(TEMPLATE_INFO_SUB_TYPE) \ |
| V(FEEDBACK_METADATA_SUB_TYPE) \ |
| V(WEAK_NEW_SPACE_OBJECT_TO_CODE_SUB_TYPE) |
| |
| enum FixedArraySubInstanceType { |
| #define DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE(name) name, |
| FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE) |
| #undef DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE |
| LAST_FIXED_ARRAY_SUB_TYPE = WEAK_NEW_SPACE_OBJECT_TO_CODE_SUB_TYPE |
| }; |
| |
| |
| // TODO(bmeurer): Remove this in favor of the ComparisonResult below. |
| enum CompareResult { |
| LESS = -1, |
| EQUAL = 0, |
| GREATER = 1, |
| |
| NOT_EQUAL = GREATER |
| }; |
| |
| |
| // Result of an abstract relational comparison of x and y, implemented according |
| // to ES6 section 7.2.11 Abstract Relational Comparison. |
| enum class ComparisonResult { |
| kLessThan, // x < y |
| kEqual, // x = y |
| kGreaterThan, // x > y |
| kUndefined // at least one of x or y was undefined or NaN |
| }; |
| |
| |
| class AbstractCode; |
| class AccessorPair; |
| class AllocationSite; |
| class Cell; |
| class ConsString; |
| class ElementsAccessor; |
| class EnumCache; |
| class FixedArrayBase; |
| class PropertyArray; |
| class FunctionLiteral; |
| class JSGlobalObject; |
| class KeyAccumulator; |
| class LayoutDescriptor; |
| class LookupIterator; |
| class FieldType; |
| class Module; |
| class ModuleInfoEntry; |
| class ObjectHashTable; |
| class ObjectVisitor; |
| class PropertyCell; |
| class PropertyDescriptor; |
| class RootVisitor; |
| class SafepointEntry; |
| class SharedFunctionInfo; |
| class StringStream; |
| class TypeFeedbackInfo; |
| class FeedbackMetadata; |
| class FeedbackVector; |
| class WeakCell; |
| class TransitionArray; |
| class TemplateList; |
| class TemplateMap; |
| template <typename T> |
| class ZoneForwardList; |
| |
| // A template-ized version of the IsXXX functions. |
| template <class C> inline bool Is(Object* obj); |
| |
| #ifdef OBJECT_PRINT |
| #define DECL_PRINTER(Name) void Name##Print(std::ostream& os); // NOLINT |
| #else |
| #define DECL_PRINTER(Name) |
| #endif |
| |
| #define OBJECT_TYPE_LIST(V) \ |
| V(Smi) \ |
| V(LayoutDescriptor) \ |
| V(HeapObject) \ |
| V(Primitive) \ |
| V(Number) |
| |
| #define HEAP_OBJECT_ORDINARY_TYPE_LIST(V) \ |
| V(AbstractCode) \ |
| V(AccessCheckNeeded) \ |
| V(ArrayList) \ |
| V(BigInt) \ |
| V(BoilerplateDescription) \ |
| V(Boolean) \ |
| V(BreakPoint) \ |
| V(BreakPointInfo) \ |
| V(ByteArray) \ |
| V(BytecodeArray) \ |
| V(Callable) \ |
| V(CallHandlerInfo) \ |
| V(Cell) \ |
| V(Code) \ |
| V(CompilationCacheTable) \ |
| V(ConsString) \ |
| V(ConstantElementsPair) \ |
| V(Constructor) \ |
| V(Context) \ |
| V(CoverageInfo) \ |
| V(DeoptimizationInputData) \ |
| V(DependentCode) \ |
| V(DescriptorArray) \ |
| V(EnumCache) \ |
| V(External) \ |
| V(ExternalOneByteString) \ |
| V(ExternalString) \ |
| V(ExternalTwoByteString) \ |
| V(FeedbackMetadata) \ |
| V(FeedbackVector) \ |
| V(Filler) \ |
| V(FixedArray) \ |
| V(FixedArrayBase) \ |
| V(FixedDoubleArray) \ |
| V(FixedFloat32Array) \ |
| V(FixedFloat64Array) \ |
| V(FixedInt16Array) \ |
| V(FixedInt32Array) \ |
| V(FixedInt8Array) \ |
| V(FixedTypedArrayBase) \ |
| V(FixedUint16Array) \ |
| V(FixedUint32Array) \ |
| V(FixedUint8Array) \ |
| V(FixedUint8ClampedArray) \ |
| V(Foreign) \ |
| V(FrameArray) \ |
| V(FreeSpace) \ |
| V(Function) \ |
| V(HandlerTable) \ |
| V(HeapNumber) \ |
| V(InternalizedString) \ |
| V(JSArgumentsObject) \ |
| V(JSArray) \ |
| V(JSArrayBuffer) \ |
| V(JSArrayBufferView) \ |
| V(JSArrayIterator) \ |
| V(JSAsyncFromSyncIterator) \ |
| V(JSAsyncGeneratorObject) \ |
| V(JSBoundFunction) \ |
| V(JSCollection) \ |
| V(JSContextExtensionObject) \ |
| V(JSDataView) \ |
| V(JSDate) \ |
| V(JSError) \ |
| V(JSFunction) \ |
| V(JSGeneratorObject) \ |
| V(JSGlobalObject) \ |
| V(JSGlobalProxy) \ |
| V(JSMap) \ |
| V(JSMapIterator) \ |
| V(JSMessageObject) \ |
| V(JSModuleNamespace) \ |
| V(JSObject) \ |
| V(JSPromise) \ |
| V(JSProxy) \ |
| V(JSReceiver) \ |
| V(JSRegExp) \ |
| V(JSSet) \ |
| V(JSSetIterator) \ |
| V(JSSloppyArgumentsObject) \ |
| V(JSStringIterator) \ |
| V(JSTypedArray) \ |
| V(JSValue) \ |
| V(JSWeakCollection) \ |
| V(JSWeakMap) \ |
| V(JSWeakSet) \ |
| V(Map) \ |
| V(MapCache) \ |
| V(ModuleInfo) \ |
| V(MutableHeapNumber) \ |
| V(Name) \ |
| V(NativeContext) \ |
| V(NormalizedMapCache) \ |
| V(ObjectHashSet) \ |
| V(ObjectHashTable) \ |
| V(Oddball) \ |
| V(PreParsedScopeData) \ |
| V(PropertyArray) \ |
| V(PropertyCell) \ |
| V(PropertyDescriptorObject) \ |
| V(RegExpMatchInfo) \ |
| V(ScopeInfo) \ |
| V(ScriptContextTable) \ |
| V(SeqOneByteString) \ |
| V(SeqString) \ |
| V(SeqTwoByteString) \ |
| V(SharedFunctionInfo) \ |
| V(SlicedString) \ |
| V(SloppyArgumentsElements) \ |
| V(SmallOrderedHashMap) \ |
| V(SmallOrderedHashSet) \ |
| V(SourcePositionTableWithFrameCache) \ |
| V(String) \ |
| V(StringSet) \ |
| V(StringTable) \ |
| V(StringWrapper) \ |
| V(Struct) \ |
| V(Symbol) \ |
| V(TemplateInfo) \ |
| V(TemplateList) \ |
| V(TemplateMap) \ |
| V(TemplateObjectDescription) \ |
| V(ThinString) \ |
| V(TransitionArray) \ |
| V(TypeFeedbackInfo) \ |
| V(Undetectable) \ |
| V(UniqueName) \ |
| V(UnseededNumberDictionary) \ |
| V(WasmInstanceObject) \ |
| V(WasmMemoryObject) \ |
| V(WasmModuleObject) \ |
| V(WasmTableObject) \ |
| V(WeakCell) \ |
| V(WeakFixedArray) \ |
| V(WeakHashTable) |
| |
| #define HEAP_OBJECT_TEMPLATE_TYPE_LIST(V) \ |
| V(Dictionary) \ |
| V(HashTable) \ |
| V(OrderedHashTable) |
| |
| #define HEAP_OBJECT_TYPE_LIST(V) \ |
| HEAP_OBJECT_ORDINARY_TYPE_LIST(V) \ |
| HEAP_OBJECT_TEMPLATE_TYPE_LIST(V) |
| |
| #define ODDBALL_LIST(V) \ |
| V(Undefined, undefined_value) \ |
| V(Null, null_value) \ |
| V(TheHole, the_hole_value) \ |
| V(Exception, exception) \ |
| V(Uninitialized, uninitialized_value) \ |
| V(True, true_value) \ |
| V(False, false_value) \ |
| V(ArgumentsMarker, arguments_marker) \ |
| V(OptimizedOut, optimized_out) \ |
| V(StaleRegister, stale_register) |
| |
| // The element types selection for CreateListFromArrayLike. |
| enum class ElementTypes { kAll, kStringAndSymbol }; |
| |
| // Object is the abstract superclass for all classes in the |
| // object hierarchy. |
| // Object does not use any virtual functions to avoid the |
| // allocation of the C++ vtable. |
| // Since both Smi and HeapObject are subclasses of Object no |
| // data members can be present in Object. |
| class Object { |
| public: |
| // Type testing. |
| bool IsObject() const { return true; } |
| |
| #define IS_TYPE_FUNCTION_DECL(Type) INLINE(bool Is##Type() const); |
| OBJECT_TYPE_LIST(IS_TYPE_FUNCTION_DECL) |
| HEAP_OBJECT_TYPE_LIST(IS_TYPE_FUNCTION_DECL) |
| #undef IS_TYPE_FUNCTION_DECL |
| |
| #define IS_TYPE_FUNCTION_DECL(Type, Value) \ |
| INLINE(bool Is##Type(Isolate* isolate) const); |
| ODDBALL_LIST(IS_TYPE_FUNCTION_DECL) |
| #undef IS_TYPE_FUNCTION_DECL |
| |
| INLINE(bool IsNullOrUndefined(Isolate* isolate) const); |
| |
| // A non-keyed store is of the form a.x = foo or a["x"] = foo whereas |
| // a keyed store is of the form a[expression] = foo. |
| enum StoreFromKeyed { |
| MAY_BE_STORE_FROM_KEYED, |
| CERTAINLY_NOT_STORE_FROM_KEYED |
| }; |
| |
| enum ShouldThrow { THROW_ON_ERROR, DONT_THROW }; |
| |
| #define RETURN_FAILURE(isolate, should_throw, call) \ |
| do { \ |
| if ((should_throw) == DONT_THROW) { \ |
| return Just(false); \ |
| } else { \ |
| isolate->Throw(*isolate->factory()->call); \ |
| return Nothing<bool>(); \ |
| } \ |
| } while (false) |
| |
| #define MAYBE_RETURN(call, value) \ |
| do { \ |
| if ((call).IsNothing()) return value; \ |
| } while (false) |
| |
| #define MAYBE_RETURN_NULL(call) MAYBE_RETURN(call, MaybeHandle<Object>()) |
| |
| #define DECL_STRUCT_PREDICATE(NAME, Name, name) INLINE(bool Is##Name() const); |
| STRUCT_LIST(DECL_STRUCT_PREDICATE) |
| #undef DECL_STRUCT_PREDICATE |
| |
| // ES6, #sec-isarray. NOT to be confused with %_IsArray. |
| INLINE(MUST_USE_RESULT static Maybe<bool> IsArray(Handle<Object> object)); |
| |
| INLINE(bool IsNameDictionary() const); |
| INLINE(bool IsGlobalDictionary() const); |
| INLINE(bool IsSeededNumberDictionary() const); |
| INLINE(bool IsOrderedHashSet() const); |
| INLINE(bool IsOrderedHashMap() const); |
| INLINE(bool IsSmallOrderedHashTable() const); |
| |
| // Extract the number. |
| inline double Number() const; |
| INLINE(bool IsNaN() const); |
| INLINE(bool IsMinusZero() const); |
| V8_EXPORT_PRIVATE bool ToInt32(int32_t* value); |
| inline bool ToUint32(uint32_t* value) const; |
| |
| inline Representation OptimalRepresentation(); |
| |
| inline ElementsKind OptimalElementsKind(); |
| |
| inline bool FitsRepresentation(Representation representation); |
| |
| // Checks whether two valid primitive encodings of a property name resolve to |
| // the same logical property. E.g., the smi 1, the string "1" and the double |
| // 1 all refer to the same property, so this helper will return true. |
| inline bool KeyEquals(Object* other); |
| |
| inline bool FilterKey(PropertyFilter filter); |
| |
| Handle<FieldType> OptimalType(Isolate* isolate, |
| Representation representation); |
| |
| inline static Handle<Object> NewStorageFor(Isolate* isolate, |
| Handle<Object> object, |
| Representation representation); |
| |
| inline static Handle<Object> WrapForRead(Isolate* isolate, |
| Handle<Object> object, |
| Representation representation); |
| |
| // Returns true if the object is of the correct type to be used as a |
| // implementation of a JSObject's elements. |
| inline bool HasValidElements(); |
| |
| inline bool HasSpecificClassOf(String* name); |
| |
| bool BooleanValue(); // ECMA-262 9.2. |
| |
| // ES6 section 7.2.11 Abstract Relational Comparison |
| MUST_USE_RESULT static Maybe<ComparisonResult> Compare(Handle<Object> x, |
| Handle<Object> y); |
| |
| // ES6 section 7.2.12 Abstract Equality Comparison |
| MUST_USE_RESULT static Maybe<bool> Equals(Handle<Object> x, Handle<Object> y); |
| |
| // ES6 section 7.2.13 Strict Equality Comparison |
| bool StrictEquals(Object* that); |
| |
| // ES6 section 7.1.13 ToObject |
| // Convert to a JSObject if needed. |
| // native_context is used when creating wrapper object. |
| // |
| // Passing a non-null method_name allows us to give a more informative |
| // error message for those cases where ToObject is being called on |
| // the receiver of a built-in method. |
| MUST_USE_RESULT static inline MaybeHandle<JSReceiver> ToObject( |
| Isolate* isolate, Handle<Object> object, |
| const char* method_name = nullptr); |
| MUST_USE_RESULT static MaybeHandle<JSReceiver> ToObject( |
| Isolate* isolate, Handle<Object> object, Handle<Context> native_context, |
| const char* method_name = nullptr); |
| |
| // ES6 section 9.2.1.2, OrdinaryCallBindThis for sloppy callee. |
| MUST_USE_RESULT static MaybeHandle<JSReceiver> ConvertReceiver( |
| Isolate* isolate, Handle<Object> object); |
| |
| // ES6 section 7.1.14 ToPropertyKey |
| MUST_USE_RESULT static inline MaybeHandle<Name> ToName(Isolate* isolate, |
| Handle<Object> input); |
| |
| // ES6 section 7.1.1 ToPrimitive |
| MUST_USE_RESULT static inline MaybeHandle<Object> ToPrimitive( |
| Handle<Object> input, ToPrimitiveHint hint = ToPrimitiveHint::kDefault); |
| |
| // ES6 section 7.1.3 ToNumber |
| MUST_USE_RESULT static inline MaybeHandle<Object> ToNumber( |
| Handle<Object> input); |
| |
| // ES6 section 7.1.4 ToInteger |
| MUST_USE_RESULT static inline MaybeHandle<Object> ToInteger( |
| Isolate* isolate, Handle<Object> input); |
| |
| // ES6 section 7.1.5 ToInt32 |
| MUST_USE_RESULT static inline MaybeHandle<Object> ToInt32( |
| Isolate* isolate, Handle<Object> input); |
| |
| // ES6 section 7.1.6 ToUint32 |
| MUST_USE_RESULT inline static MaybeHandle<Object> ToUint32( |
| Isolate* isolate, Handle<Object> input); |
| |
| // ES6 section 7.1.12 ToString |
| MUST_USE_RESULT static inline MaybeHandle<String> ToString( |
| Isolate* isolate, Handle<Object> input); |
| |
| static Handle<String> NoSideEffectsToString(Isolate* isolate, |
| Handle<Object> input); |
| |
| // ES6 section 7.1.14 ToPropertyKey |
| MUST_USE_RESULT static inline MaybeHandle<Object> ToPropertyKey( |
| Isolate* isolate, Handle<Object> value); |
| |
| // ES6 section 7.1.15 ToLength |
| MUST_USE_RESULT static inline MaybeHandle<Object> ToLength( |
| Isolate* isolate, Handle<Object> input); |
| |
| // ES6 section 7.1.17 ToIndex |
| MUST_USE_RESULT static inline MaybeHandle<Object> ToIndex( |
| Isolate* isolate, Handle<Object> input, |
| MessageTemplate::Template error_index); |
| |
| // ES6 section 7.3.9 GetMethod |
| MUST_USE_RESULT static MaybeHandle<Object> GetMethod( |
| Handle<JSReceiver> receiver, Handle<Name> name); |
| |
| // ES6 section 7.3.17 CreateListFromArrayLike |
| MUST_USE_RESULT static MaybeHandle<FixedArray> CreateListFromArrayLike( |
| Isolate* isolate, Handle<Object> object, ElementTypes element_types); |
| |
| // Get length property and apply ToLength. |
| MUST_USE_RESULT static MaybeHandle<Object> GetLengthFromArrayLike( |
| Isolate* isolate, Handle<Object> object); |
| |
| // ES6 section 12.5.6 The typeof Operator |
| static Handle<String> TypeOf(Isolate* isolate, Handle<Object> object); |
| |
| // ES6 section 12.6 Multiplicative Operators |
| MUST_USE_RESULT static MaybeHandle<Object> Multiply(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> Divide(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> Modulus(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| |
| // ES6 section 12.7 Additive Operators |
| MUST_USE_RESULT static MaybeHandle<Object> Add(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> Subtract(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| |
| // ES6 section 12.8 Bitwise Shift Operators |
| MUST_USE_RESULT static MaybeHandle<Object> ShiftLeft(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> ShiftRight(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> ShiftRightLogical( |
| Isolate* isolate, Handle<Object> lhs, Handle<Object> rhs); |
| |
| // ES6 section 12.9 Relational Operators |
| MUST_USE_RESULT static inline Maybe<bool> GreaterThan(Handle<Object> x, |
| Handle<Object> y); |
| MUST_USE_RESULT static inline Maybe<bool> GreaterThanOrEqual( |
| Handle<Object> x, Handle<Object> y); |
| MUST_USE_RESULT static inline Maybe<bool> LessThan(Handle<Object> x, |
| Handle<Object> y); |
| MUST_USE_RESULT static inline Maybe<bool> LessThanOrEqual(Handle<Object> x, |
| Handle<Object> y); |
| |
| // ES6 section 12.11 Binary Bitwise Operators |
| MUST_USE_RESULT static MaybeHandle<Object> BitwiseAnd(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> BitwiseOr(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> BitwiseXor(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| |
| // ES6 section 7.3.19 OrdinaryHasInstance (C, O). |
| MUST_USE_RESULT static MaybeHandle<Object> OrdinaryHasInstance( |
| Isolate* isolate, Handle<Object> callable, Handle<Object> object); |
| |
| // ES6 section 12.10.4 Runtime Semantics: InstanceofOperator(O, C) |
| MUST_USE_RESULT static MaybeHandle<Object> InstanceOf( |
| Isolate* isolate, Handle<Object> object, Handle<Object> callable); |
| |
| V8_EXPORT_PRIVATE MUST_USE_RESULT static MaybeHandle<Object> GetProperty( |
| LookupIterator* it); |
| |
| // ES6 [[Set]] (when passed DONT_THROW) |
| // Invariants for this and related functions (unless stated otherwise): |
| // 1) When the result is Nothing, an exception is pending. |
| // 2) When passed THROW_ON_ERROR, the result is never Just(false). |
| // In some cases, an exception is thrown regardless of the ShouldThrow |
| // argument. These cases are either in accordance with the spec or not |
| // covered by it (eg., concerning API callbacks). |
| MUST_USE_RESULT static Maybe<bool> SetProperty(LookupIterator* it, |
| Handle<Object> value, |
| LanguageMode language_mode, |
| StoreFromKeyed store_mode); |
| MUST_USE_RESULT static MaybeHandle<Object> SetProperty( |
| Handle<Object> object, Handle<Name> name, Handle<Object> value, |
| LanguageMode language_mode, |
| StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED); |
| MUST_USE_RESULT static inline MaybeHandle<Object> SetPropertyOrElement( |
| Handle<Object> object, Handle<Name> name, Handle<Object> value, |
| LanguageMode language_mode, |
| StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED); |
| |
| MUST_USE_RESULT static Maybe<bool> SetSuperProperty( |
| LookupIterator* it, Handle<Object> value, LanguageMode language_mode, |
| StoreFromKeyed store_mode); |
| |
| MUST_USE_RESULT static Maybe<bool> CannotCreateProperty( |
| Isolate* isolate, Handle<Object> receiver, Handle<Object> name, |
| Handle<Object> value, ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> WriteToReadOnlyProperty( |
| LookupIterator* it, Handle<Object> value, ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> WriteToReadOnlyProperty( |
| Isolate* isolate, Handle<Object> receiver, Handle<Object> name, |
| Handle<Object> value, ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> RedefineIncompatibleProperty( |
| Isolate* isolate, Handle<Object> name, Handle<Object> value, |
| ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> SetDataProperty(LookupIterator* it, |
| Handle<Object> value); |
| MUST_USE_RESULT static Maybe<bool> AddDataProperty( |
| LookupIterator* it, Handle<Object> value, PropertyAttributes attributes, |
| ShouldThrow should_throw, StoreFromKeyed store_mode); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetPropertyOrElement( |
| Handle<Object> object, Handle<Name> name); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetPropertyOrElement( |
| Handle<Object> receiver, Handle<Name> name, Handle<JSReceiver> holder); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty( |
| Handle<Object> object, Handle<Name> name); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithAccessor( |
| LookupIterator* it); |
| MUST_USE_RESULT static Maybe<bool> SetPropertyWithAccessor( |
| LookupIterator* it, Handle<Object> value, ShouldThrow should_throw); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithDefinedGetter( |
| Handle<Object> receiver, |
| Handle<JSReceiver> getter); |
| MUST_USE_RESULT static Maybe<bool> SetPropertyWithDefinedSetter( |
| Handle<Object> receiver, Handle<JSReceiver> setter, Handle<Object> value, |
| ShouldThrow should_throw); |
| |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetElement( |
| Isolate* isolate, Handle<Object> object, uint32_t index); |
| |
| MUST_USE_RESULT static inline MaybeHandle<Object> SetElement( |
| Isolate* isolate, Handle<Object> object, uint32_t index, |
| Handle<Object> value, LanguageMode language_mode); |
| |
| // Returns the permanent hash code associated with this object. May return |
| // undefined if not yet created. |
| Object* GetHash(); |
| |
| // Returns the permanent hash code associated with this object depending on |
| // the actual object type. May create and store a hash code if needed and none |
| // exists. |
| Smi* GetOrCreateHash(Isolate* isolate); |
| static Smi* GetOrCreateHash(Isolate* isolate, Object* key); |
| |
| // Checks whether this object has the same value as the given one. This |
| // function is implemented according to ES5, section 9.12 and can be used |
| // to implement the Harmony "egal" function. |
| V8_EXPORT_PRIVATE bool SameValue(Object* other); |
| |
| // Checks whether this object has the same value as the given one. |
| // +0 and -0 are treated equal. Everything else is the same as SameValue. |
| // This function is implemented according to ES6, section 7.2.4 and is used |
| // by ES6 Map and Set. |
| bool SameValueZero(Object* other); |
| |
| // ES6 section 9.4.2.3 ArraySpeciesCreate (part of it) |
| MUST_USE_RESULT static MaybeHandle<Object> ArraySpeciesConstructor( |
| Isolate* isolate, Handle<Object> original_array); |
| |
| // ES6 section 7.3.20 SpeciesConstructor ( O, defaultConstructor ) |
| MUST_USE_RESULT static MaybeHandle<Object> SpeciesConstructor( |
| Isolate* isolate, Handle<JSReceiver> recv, |
| Handle<JSFunction> default_ctor); |
| |
| // Tries to convert an object to an array length. Returns true and sets the |
| // output parameter if it succeeds. |
| inline bool ToArrayLength(uint32_t* index) const; |
| |
| // Tries to convert an object to an array index. Returns true and sets the |
| // output parameter if it succeeds. Equivalent to ToArrayLength, but does not |
| // allow kMaxUInt32. |
| inline bool ToArrayIndex(uint32_t* index) const; |
| |
| // Returns true if the result of iterating over the object is the same |
| // (including observable effects) as simply accessing the properties between 0 |
| // and length. |
| bool IterationHasObservableEffects(); |
| |
| DECL_VERIFIER(Object) |
| #ifdef VERIFY_HEAP |
| // Verify a pointer is a valid object pointer. |
| static void VerifyPointer(Object* p); |
| #endif |
| |
| inline void VerifyApiCallResultType(); |
| |
| // Prints this object without details. |
| void ShortPrint(FILE* out = stdout); |
| |
| // Prints this object without details to a message accumulator. |
| void ShortPrint(StringStream* accumulator); |
| |
| void ShortPrint(std::ostream& os); // NOLINT |
| |
| DECL_CAST(Object) |
| |
| // Layout description. |
| static const int kHeaderSize = 0; // Object does not take up any space. |
| |
| #ifdef OBJECT_PRINT |
| // For our gdb macros, we should perhaps change these in the future. |
| void Print(); |
| |
| // Prints this object with details. |
| void Print(std::ostream& os); // NOLINT |
| #else |
| void Print() { ShortPrint(); } |
| void Print(std::ostream& os) { ShortPrint(os); } // NOLINT |
| #endif |
| |
| private: |
| friend class LookupIterator; |
| friend class StringStream; |
| |
| // Return the map of the root of object's prototype chain. |
| Map* GetPrototypeChainRootMap(Isolate* isolate) const; |
| |
| // Helper for SetProperty and SetSuperProperty. |
| // Return value is only meaningful if [found] is set to true on return. |
| MUST_USE_RESULT static Maybe<bool> SetPropertyInternal( |
| LookupIterator* it, Handle<Object> value, LanguageMode language_mode, |
| StoreFromKeyed store_mode, bool* found); |
| |
| MUST_USE_RESULT static MaybeHandle<Name> ConvertToName(Isolate* isolate, |
| Handle<Object> input); |
| MUST_USE_RESULT static MaybeHandle<Object> ConvertToPropertyKey( |
| Isolate* isolate, Handle<Object> value); |
| MUST_USE_RESULT static MaybeHandle<String> ConvertToString( |
| Isolate* isolate, Handle<Object> input); |
| MUST_USE_RESULT static MaybeHandle<Object> ConvertToNumber( |
| Isolate* isolate, Handle<Object> input); |
| MUST_USE_RESULT static MaybeHandle<Object> ConvertToInteger( |
| Isolate* isolate, Handle<Object> input); |
| MUST_USE_RESULT static MaybeHandle<Object> ConvertToInt32( |
| Isolate* isolate, Handle<Object> input); |
| MUST_USE_RESULT static MaybeHandle<Object> ConvertToUint32( |
| Isolate* isolate, Handle<Object> input); |
| MUST_USE_RESULT static MaybeHandle<Object> ConvertToLength( |
| Isolate* isolate, Handle<Object> input); |
| MUST_USE_RESULT static MaybeHandle<Object> ConvertToIndex( |
| Isolate* isolate, Handle<Object> input, |
| MessageTemplate::Template error_index); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Object); |
| }; |
| |
| |
| // In objects.h to be usable without objects-inl.h inclusion. |
| bool Object::IsSmi() const { return HAS_SMI_TAG(this); } |
| bool Object::IsHeapObject() const { |
| DCHECK_EQ(!IsSmi(), Internals::HasHeapObjectTag(this)); |
| return !IsSmi(); |
| } |
| |
| struct Brief { |
| explicit Brief(const Object* const v) : value(v) {} |
| const Object* value; |
| }; |
| |
| V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os, const Brief& v); |
| |
| // Smi represents integer Numbers that can be stored in 31 bits. |
| // Smis are immediate which means they are NOT allocated in the heap. |
| // The this pointer has the following format: [31 bit signed int] 0 |
| // For long smis it has the following format: |
| // [32 bit signed int] [31 bits zero padding] 0 |
| // Smi stands for small integer. |
| class Smi: public Object { |
| public: |
| // Returns the integer value. |
| inline int value() const { return Internals::SmiValue(this); } |
| inline Smi* ToUint32Smi() { |
| if (value() <= 0) return Smi::kZero; |
| return Smi::FromInt(static_cast<uint32_t>(value())); |
| } |
| |
| // Convert a Smi object to an int. |
| static inline int ToInt(const Object* object); |
| |
| // Convert a value to a Smi object. |
| static inline Smi* FromInt(int value) { |
| DCHECK(Smi::IsValid(value)); |
| return reinterpret_cast<Smi*>(Internals::IntToSmi(value)); |
| } |
| |
| static inline Smi* FromIntptr(intptr_t value) { |
| DCHECK(Smi::IsValid(value)); |
| int smi_shift_bits = kSmiTagSize + kSmiShiftSize; |
| return reinterpret_cast<Smi*>((value << smi_shift_bits) | kSmiTag); |
| } |
| |
| template <typename E, |
| typename = typename std::enable_if<std::is_enum<E>::value>::type> |
| static inline Smi* FromEnum(E value) { |
| STATIC_ASSERT(sizeof(E) <= sizeof(int)); |
| return FromInt(static_cast<int>(value)); |
| } |
| |
| // Returns whether value can be represented in a Smi. |
| static inline bool IsValid(intptr_t value) { |
| bool result = Internals::IsValidSmi(value); |
| DCHECK_EQ(result, value >= kMinValue && value <= kMaxValue); |
| return result; |
| } |
| |
| DECL_CAST(Smi) |
| |
| // Dispatched behavior. |
| V8_EXPORT_PRIVATE void SmiPrint(std::ostream& os) const; // NOLINT |
| DECL_VERIFIER(Smi) |
| |
| static constexpr Smi* const kZero = nullptr; |
| static const int kMinValue = |
| (static_cast<unsigned int>(-1)) << (kSmiValueSize - 1); |
| static const int kMaxValue = -(kMinValue + 1); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Smi); |
| }; |
| |
| |
| // Heap objects typically have a map pointer in their first word. However, |
| // during GC other data (e.g. mark bits, forwarding addresses) is sometimes |
| // encoded in the first word. The class MapWord is an abstraction of the |
| // value in a heap object's first word. |
| class MapWord BASE_EMBEDDED { |
| public: |
| // Normal state: the map word contains a map pointer. |
| |
| // Create a map word from a map pointer. |
| static inline MapWord FromMap(const Map* map); |
| |
| // View this map word as a map pointer. |
| inline Map* ToMap() const; |
| |
| // Scavenge collection: the map word of live objects in the from space |
| // contains a forwarding address (a heap object pointer in the to space). |
| |
| // True if this map word is a forwarding address for a scavenge |
| // collection. Only valid during a scavenge collection (specifically, |
| // when all map words are heap object pointers, i.e. not during a full GC). |
| inline bool IsForwardingAddress() const; |
| |
| // Create a map word from a forwarding address. |
| static inline MapWord FromForwardingAddress(HeapObject* object); |
| |
| // View this map word as a forwarding address. |
| inline HeapObject* ToForwardingAddress(); |
| |
| static inline MapWord FromRawValue(uintptr_t value) { |
| return MapWord(value); |
| } |
| |
| inline uintptr_t ToRawValue() { |
| return value_; |
| } |
| |
| private: |
| // HeapObject calls the private constructor and directly reads the value. |
| friend class HeapObject; |
| |
| explicit MapWord(uintptr_t value) : value_(value) {} |
| |
| uintptr_t value_; |
| }; |
| |
| |
| // HeapObject is the superclass for all classes describing heap allocated |
| // objects. |
| class HeapObject: public Object { |
| public: |
| // [map]: Contains a map which contains the object's reflective |
| // information. |
| inline Map* map() const; |
| inline void set_map(Map* value); |
| |
| inline HeapObject** map_slot(); |
| |
| // The no-write-barrier version. This is OK if the object is white and in |
| // new space, or if the value is an immortal immutable object, like the maps |
| // of primitive (non-JS) objects like strings, heap numbers etc. |
| inline void set_map_no_write_barrier(Map* value); |
| |
| // Get the map using acquire load. |
| inline Map* synchronized_map() const; |
| inline MapWord synchronized_map_word() const; |
| |
| // Set the map using release store |
| inline void synchronized_set_map(Map* value); |
| inline void synchronized_set_map_word(MapWord map_word); |
| |
| // Initialize the map immediately after the object is allocated. |
| // Do not use this outside Heap. |
| inline void set_map_after_allocation( |
| Map* value, WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| |
| // During garbage collection, the map word of a heap object does not |
| // necessarily contain a map pointer. |
| inline MapWord map_word() const; |
| inline void set_map_word(MapWord map_word); |
| |
| // The Heap the object was allocated in. Used also to access Isolate. |
| inline Heap* GetHeap() const; |
| |
| // Convenience method to get current isolate. |
| inline Isolate* GetIsolate() const; |
| |
| #define IS_TYPE_FUNCTION_DECL(Type) INLINE(bool Is##Type() const); |
| HEAP_OBJECT_TYPE_LIST(IS_TYPE_FUNCTION_DECL) |
| #undef IS_TYPE_FUNCTION_DECL |
| |
| #define IS_TYPE_FUNCTION_DECL(Type, Value) \ |
| INLINE(bool Is##Type(Isolate* isolate) const); |
| ODDBALL_LIST(IS_TYPE_FUNCTION_DECL) |
| #undef IS_TYPE_FUNCTION_DECL |
| |
| INLINE(bool IsNullOrUndefined(Isolate* isolate) const); |
| |
| #define DECL_STRUCT_PREDICATE(NAME, Name, name) INLINE(bool Is##Name() const); |
| STRUCT_LIST(DECL_STRUCT_PREDICATE) |
| #undef DECL_STRUCT_PREDICATE |
| |
| // Converts an address to a HeapObject pointer. |
| static inline HeapObject* FromAddress(Address address) { |
| DCHECK_TAG_ALIGNED(address); |
| return reinterpret_cast<HeapObject*>(address + kHeapObjectTag); |
| } |
| |
| // Returns the address of this HeapObject. |
| inline Address address() const { |
| return reinterpret_cast<Address>(const_cast<HeapObject*>(this)) - |
| kHeapObjectTag; |
| } |
| |
| // Iterates over pointers contained in the object (including the Map). |
| // If it's not performance critical iteration use the non-templatized |
| // version. |
| void Iterate(ObjectVisitor* v); |
| |
| template <typename ObjectVisitor> |
| inline void IterateFast(ObjectVisitor* v); |
| |
| // Iterates over all pointers contained in the object except the |
| // first map pointer. The object type is given in the first |
| // parameter. This function does not access the map pointer in the |
| // object, and so is safe to call while the map pointer is modified. |
| // If it's not performance critical iteration use the non-templatized |
| // version. |
| void IterateBody(ObjectVisitor* v); |
| void IterateBody(InstanceType type, int object_size, ObjectVisitor* v); |
| |
| template <typename ObjectVisitor> |
| inline void IterateBodyFast(ObjectVisitor* v); |
| |
| template <typename ObjectVisitor> |
| inline void IterateBodyFast(InstanceType type, int object_size, |
| ObjectVisitor* v); |
| |
| // Returns true if the object contains a tagged value at given offset. |
| // It is used for invalid slots filtering. If the offset points outside |
| // of the object or to the map word, the result is UNDEFINED (!!!). |
| bool IsValidSlot(int offset); |
| |
| // Returns the heap object's size in bytes |
| inline int Size() const; |
| |
| // Given a heap object's map pointer, returns the heap size in bytes |
| // Useful when the map pointer field is used for other purposes. |
| // GC internal. |
| inline int SizeFromMap(Map* map) const; |
| |
| // Returns the field at offset in obj, as a read/write Object* reference. |
| // Does no checking, and is safe to use during GC, while maps are invalid. |
| // Does not invoke write barrier, so should only be assigned to |
| // during marking GC. |
| static inline Object** RawField(HeapObject* obj, int offset); |
| |
| DECL_CAST(HeapObject) |
| |
| // Return the write barrier mode for this. Callers of this function |
| // must be able to present a reference to an DisallowHeapAllocation |
| // object as a sign that they are not going to use this function |
| // from code that allocates and thus invalidates the returned write |
| // barrier mode. |
| inline WriteBarrierMode GetWriteBarrierMode( |
| const DisallowHeapAllocation& promise); |
| |
| // Dispatched behavior. |
| void HeapObjectShortPrint(std::ostream& os); // NOLINT |
| #ifdef OBJECT_PRINT |
| void PrintHeader(std::ostream& os, const char* id); // NOLINT |
| #endif |
| DECL_PRINTER(HeapObject) |
| DECL_VERIFIER(HeapObject) |
| #ifdef VERIFY_HEAP |
| inline void VerifyObjectField(int offset); |
| inline void VerifySmiField(int offset); |
| |
| // Verify a pointer is a valid HeapObject pointer that points to object |
| // areas in the heap. |
| static void VerifyHeapPointer(Object* p); |
| #endif |
| |
| inline AllocationAlignment RequiredAlignment() const; |
| |
| // Layout description. |
| // First field in a heap object is map. |
| static const int kMapOffset = Object::kHeaderSize; |
| static const int kHeaderSize = kMapOffset + kPointerSize; |
| |
| STATIC_ASSERT(kMapOffset == Internals::kHeapObjectMapOffset); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(HeapObject); |
| }; |
| |
| |
| template <int start_offset, int end_offset, int size> |
| class FixedBodyDescriptor; |
| |
| |
| template <int start_offset> |
| class FlexibleBodyDescriptor; |
| |
| |
| // The HeapNumber class describes heap allocated numbers that cannot be |
| // represented in a Smi (small integer) |
| class HeapNumber: public HeapObject { |
| public: |
| // [value]: number value. |
| inline double value() const; |
| inline void set_value(double value); |
| |
| inline uint64_t value_as_bits() const; |
| inline void set_value_as_bits(uint64_t bits); |
| |
| DECL_CAST(HeapNumber) |
| |
| V8_EXPORT_PRIVATE void HeapNumberPrint(std::ostream& os); // NOLINT |
| DECL_VERIFIER(HeapNumber) |
| |
| inline int get_exponent(); |
| inline int get_sign(); |
| |
| // Layout description. |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| // IEEE doubles are two 32 bit words. The first is just mantissa, the second |
| // is a mixture of sign, exponent and mantissa. The offsets of two 32 bit |
| // words within double numbers are endian dependent and they are set |
| // accordingly. |
| #if defined(V8_TARGET_LITTLE_ENDIAN) |
| static const int kMantissaOffset = kValueOffset; |
| static const int kExponentOffset = kValueOffset + 4; |
| #elif defined(V8_TARGET_BIG_ENDIAN) |
| static const int kMantissaOffset = kValueOffset + 4; |
| static const int kExponentOffset = kValueOffset; |
| #else |
| #error Unknown byte ordering |
| #endif |
| |
| static const int kSize = kValueOffset + kDoubleSize; |
| static const uint32_t kSignMask = 0x80000000u; |
| static const uint32_t kExponentMask = 0x7ff00000u; |
| static const uint32_t kMantissaMask = 0xfffffu; |
| static const int kMantissaBits = 52; |
| static const int kExponentBits = 11; |
| static const int kExponentBias = 1023; |
| static const int kExponentShift = 20; |
| static const int kInfinityOrNanExponent = |
| (kExponentMask >> kExponentShift) - kExponentBias; |
| static const int kMantissaBitsInTopWord = 20; |
| static const int kNonMantissaBitsInTopWord = 12; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(HeapNumber); |
| }; |
| |
| enum EnsureElementsMode { |
| DONT_ALLOW_DOUBLE_ELEMENTS, |
| ALLOW_COPIED_DOUBLE_ELEMENTS, |
| ALLOW_CONVERTED_DOUBLE_ELEMENTS |
| }; |
| |
| |
| // Indicator for one component of an AccessorPair. |
| enum AccessorComponent { |
| ACCESSOR_GETTER, |
| ACCESSOR_SETTER |
| }; |
| |
| enum class GetKeysConversion { kKeepNumbers, kConvertToString }; |
| |
| enum class KeyCollectionMode { |
| kOwnOnly = static_cast<int>(v8::KeyCollectionMode::kOwnOnly), |
| kIncludePrototypes = |
| static_cast<int>(v8::KeyCollectionMode::kIncludePrototypes) |
| }; |
| |
| enum class AllocationSiteUpdateMode { kUpdate, kCheckOnly }; |
| |
| class PropertyArray : public HeapObject { |
| public: |
| // [length]: length of the array. |
| inline int length() const; |
| |
| // Get the length using acquire loads. |
| inline int synchronized_length() const; |
| |
| // This is only used on a newly allocated PropertyArray which |
| // doesn't have an existing hash. |
| inline void initialize_length(int length); |
| |
| inline void SetHash(int hash); |
| inline int Hash() const; |
| |
| inline Object* get(int index) const; |
| |
| inline void set(int index, Object* value); |
| // Setter with explicit barrier mode. |
| inline void set(int index, Object* value, WriteBarrierMode mode); |
| |
| // Gives access to raw memory which stores the array's data. |
| inline Object** data_start(); |
| |
| // Garbage collection support. |
| static constexpr int SizeFor(int length) { |
| return kHeaderSize + length * kPointerSize; |
| } |
| |
| DECL_CAST(PropertyArray) |
| DECL_PRINTER(PropertyArray) |
| DECL_VERIFIER(PropertyArray) |
| |
| // Layout description. |
| static const int kLengthAndHashOffset = HeapObject::kHeaderSize; |
| static const int kHeaderSize = kLengthAndHashOffset + kPointerSize; |
| |
| // Garbage collection support. |
| typedef FlexibleBodyDescriptor<kHeaderSize> BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| static const int kLengthMask = 0x3ff; |
| static const int kHashMask = 0x7ffffc00; |
| STATIC_ASSERT(kLengthMask + kHashMask == 0x7fffffff); |
| |
| static const int kMaxLength = kLengthMask; |
| STATIC_ASSERT(kMaxLength > kMaxNumberOfDescriptors); |
| |
| static const int kNoHashSentinel = 0; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PropertyArray); |
| }; |
| |
| // JSReceiver includes types on which properties can be defined, i.e., |
| // JSObject and JSProxy. |
| class JSReceiver: public HeapObject { |
| public: |
| // Returns true if there is no slow (ie, dictionary) backing store. |
| inline bool HasFastProperties() const; |
| |
| // Returns the properties array backing store if it |
| // exists. Otherwise, returns an empty_property_array when there's a |
| // Smi (hash code) or an empty_fixed_array for a fast properties |
| // map. |
| inline PropertyArray* property_array() const; |
| |
| // Gets slow properties for non-global objects. |
| inline NameDictionary* property_dictionary() const; |
| |
| void SetProperties(HeapObject* properties); |
| |
| // There are five possible values for the properties offset. |
| // 1) EmptyFixedArray/EmptyPropertyDictionary - This is the standard |
| // placeholder. |
| // |
| // 2) Smi - This is the hash code of the object. |
| // |
| // 3) PropertyArray - This is similar to a FixedArray but stores |
| // the hash code of the object in its length field. This is a fast |
| // backing store. |
| // |
| // 4) NameDictionary - This is the dictionary-mode backing store. |
| // |
| // 4) GlobalDictionary - This is the backing store for the |
| // GlobalObject. |
| // |
| // This is used only in the deoptimizer and heap. Please use the |
| // above typed getters and setters to access the properties. |
| DECL_ACCESSORS(raw_properties_or_hash, Object) |
| |
| inline void initialize_properties(); |
| |
| // Deletes an existing named property in a normalized object. |
| static void DeleteNormalizedProperty(Handle<JSReceiver> object, int entry); |
| |
| DECL_CAST(JSReceiver) |
| |
| // ES6 section 7.1.1 ToPrimitive |
| MUST_USE_RESULT static MaybeHandle<Object> ToPrimitive( |
| Handle<JSReceiver> receiver, |
| ToPrimitiveHint hint = ToPrimitiveHint::kDefault); |
| |
| // ES6 section 7.1.1.1 OrdinaryToPrimitive |
| MUST_USE_RESULT static MaybeHandle<Object> OrdinaryToPrimitive( |
| Handle<JSReceiver> receiver, OrdinaryToPrimitiveHint hint); |
| |
| static MaybeHandle<Context> GetFunctionRealm(Handle<JSReceiver> receiver); |
| |
| // Get the first non-hidden prototype. |
| static inline MaybeHandle<Object> GetPrototype(Isolate* isolate, |
| Handle<JSReceiver> receiver); |
| |
| MUST_USE_RESULT static Maybe<bool> HasInPrototypeChain( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> proto); |
| |
| // Reads all enumerable own properties of source and adds them to |
| // target, using either Set or CreateDataProperty depending on the |
| // use_set argument. This only copies values not present in the |
| // maybe_excluded_properties list. |
| MUST_USE_RESULT static Maybe<bool> SetOrCopyDataProperties( |
| Isolate* isolate, Handle<JSReceiver> target, Handle<Object> source, |
| const ScopedVector<Handle<Object>>* excluded_properties = nullptr, |
| bool use_set = true); |
| |
| // Implementation of [[HasProperty]], ECMA-262 5th edition, section 8.12.6. |
| MUST_USE_RESULT static Maybe<bool> HasProperty(LookupIterator* it); |
| MUST_USE_RESULT static inline Maybe<bool> HasProperty( |
| Handle<JSReceiver> object, Handle<Name> name); |
| MUST_USE_RESULT static inline Maybe<bool> HasElement( |
| Handle<JSReceiver> object, uint32_t index); |
| |
| MUST_USE_RESULT static Maybe<bool> HasOwnProperty(Handle<JSReceiver> object, |
| Handle<Name> name); |
| MUST_USE_RESULT static inline Maybe<bool> HasOwnProperty( |
| Handle<JSReceiver> object, uint32_t index); |
| |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty( |
| Isolate* isolate, Handle<JSReceiver> receiver, const char* key); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty( |
| Handle<JSReceiver> receiver, Handle<Name> name); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetElement( |
| Isolate* isolate, Handle<JSReceiver> receiver, uint32_t index); |
| |
| // Implementation of ES6 [[Delete]] |
| MUST_USE_RESULT static Maybe<bool> DeletePropertyOrElement( |
| Handle<JSReceiver> object, Handle<Name> name, |
| LanguageMode language_mode = SLOPPY); |
| MUST_USE_RESULT static Maybe<bool> DeleteProperty( |
| Handle<JSReceiver> object, Handle<Name> name, |
| LanguageMode language_mode = SLOPPY); |
| MUST_USE_RESULT static Maybe<bool> DeleteProperty(LookupIterator* it, |
| LanguageMode language_mode); |
| MUST_USE_RESULT static Maybe<bool> DeleteElement( |
| Handle<JSReceiver> object, uint32_t index, |
| LanguageMode language_mode = SLOPPY); |
| |
| MUST_USE_RESULT static Object* DefineProperty(Isolate* isolate, |
| Handle<Object> object, |
| Handle<Object> name, |
| Handle<Object> attributes); |
| MUST_USE_RESULT static MaybeHandle<Object> DefineProperties( |
| Isolate* isolate, Handle<Object> object, Handle<Object> properties); |
| |
| // "virtual" dispatcher to the correct [[DefineOwnProperty]] implementation. |
| MUST_USE_RESULT static Maybe<bool> DefineOwnProperty( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> key, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| |
| // ES6 7.3.4 (when passed DONT_THROW) |
| MUST_USE_RESULT static Maybe<bool> CreateDataProperty( |
| LookupIterator* it, Handle<Object> value, ShouldThrow should_throw); |
| |
| // ES6 9.1.6.1 |
| MUST_USE_RESULT static Maybe<bool> OrdinaryDefineOwnProperty( |
| Isolate* isolate, Handle<JSObject> object, Handle<Object> key, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> OrdinaryDefineOwnProperty( |
| LookupIterator* it, PropertyDescriptor* desc, ShouldThrow should_throw); |
| // ES6 9.1.6.2 |
| MUST_USE_RESULT static Maybe<bool> IsCompatiblePropertyDescriptor( |
| Isolate* isolate, bool extensible, PropertyDescriptor* desc, |
| PropertyDescriptor* current, Handle<Name> property_name, |
| ShouldThrow should_throw); |
| // ES6 9.1.6.3 |
| // |it| can be NULL in cases where the ES spec passes |undefined| as the |
| // receiver. Exactly one of |it| and |property_name| must be provided. |
| MUST_USE_RESULT static Maybe<bool> ValidateAndApplyPropertyDescriptor( |
| Isolate* isolate, LookupIterator* it, bool extensible, |
| PropertyDescriptor* desc, PropertyDescriptor* current, |
| ShouldThrow should_throw, Handle<Name> property_name); |
| |
| V8_EXPORT_PRIVATE MUST_USE_RESULT static Maybe<bool> GetOwnPropertyDescriptor( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> key, |
| PropertyDescriptor* desc); |
| MUST_USE_RESULT static Maybe<bool> GetOwnPropertyDescriptor( |
| LookupIterator* it, PropertyDescriptor* desc); |
| |
| typedef PropertyAttributes IntegrityLevel; |
| |
| // ES6 7.3.14 (when passed DONT_THROW) |
| // 'level' must be SEALED or FROZEN. |
| MUST_USE_RESULT static Maybe<bool> SetIntegrityLevel( |
| Handle<JSReceiver> object, IntegrityLevel lvl, ShouldThrow should_throw); |
| |
| // ES6 7.3.15 |
| // 'level' must be SEALED or FROZEN. |
| MUST_USE_RESULT static Maybe<bool> TestIntegrityLevel( |
| Handle<JSReceiver> object, IntegrityLevel lvl); |
| |
| // ES6 [[PreventExtensions]] (when passed DONT_THROW) |
| MUST_USE_RESULT static Maybe<bool> PreventExtensions( |
| Handle<JSReceiver> object, ShouldThrow should_throw); |
| |
| MUST_USE_RESULT static Maybe<bool> IsExtensible(Handle<JSReceiver> object); |
| |
| // Returns the class name ([[Class]] property in the specification). |
| V8_EXPORT_PRIVATE String* class_name(); |
| |
| // Returns the constructor name (the name (possibly, inferred name) of the |
| // function that was used to instantiate the object). |
| static Handle<String> GetConstructorName(Handle<JSReceiver> receiver); |
| |
| Handle<Context> GetCreationContext(); |
| |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> GetPropertyAttributes( |
| Handle<JSReceiver> object, Handle<Name> name); |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnPropertyAttributes(Handle<JSReceiver> object, Handle<Name> name); |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnPropertyAttributes(Handle<JSReceiver> object, uint32_t index); |
| |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> GetElementAttributes( |
| Handle<JSReceiver> object, uint32_t index); |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnElementAttributes(Handle<JSReceiver> object, uint32_t index); |
| |
| MUST_USE_RESULT static Maybe<PropertyAttributes> GetPropertyAttributes( |
| LookupIterator* it); |
| |
| // Set the object's prototype (only JSReceiver and null are allowed values). |
| MUST_USE_RESULT static Maybe<bool> SetPrototype(Handle<JSReceiver> object, |
| Handle<Object> value, |
| bool from_javascript, |
| ShouldThrow should_throw); |
| |
| inline static Handle<Object> GetDataProperty(Handle<JSReceiver> object, |
| Handle<Name> name); |
| static Handle<Object> GetDataProperty(LookupIterator* it); |
| |
| |
| // Retrieves a permanent object identity hash code. The undefined value might |
| // be returned in case no hash was created yet. |
| inline Object* GetIdentityHash(Isolate* isolate); |
| |
| // Retrieves a permanent object identity hash code. May create and store a |
| // hash code if needed and none exists. |
| inline Smi* GetOrCreateIdentityHash(Isolate* isolate); |
| |
| // Stores the hash code. The hash passed in must be masked with |
| // JSReceiver::kHashMask. |
| void SetIdentityHash(int masked_hash); |
| |
| // ES6 [[OwnPropertyKeys]] (modulo return type) |
| MUST_USE_RESULT static inline MaybeHandle<FixedArray> OwnPropertyKeys( |
| Handle<JSReceiver> object); |
| |
| MUST_USE_RESULT static MaybeHandle<FixedArray> GetOwnValues( |
| Handle<JSReceiver> object, PropertyFilter filter); |
| |
| MUST_USE_RESULT static MaybeHandle<FixedArray> GetOwnEntries( |
| Handle<JSReceiver> object, PropertyFilter filter); |
| |
| static const int kHashMask = PropertyArray::kHashMask; |
| |
| // Layout description. |
| static const int kPropertiesOrHashOffset = HeapObject::kHeaderSize; |
| static const int kHeaderSize = HeapObject::kHeaderSize + kPointerSize; |
| |
| bool HasProxyInPrototype(Isolate* isolate); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSReceiver); |
| }; |
| |
| |
| // The JSObject describes real heap allocated JavaScript objects with |
| // properties. |
| // Note that the map of JSObject changes during execution to enable inline |
| // caching. |
| class JSObject: public JSReceiver { |
| public: |
| static bool IsUnmodifiedApiObject(Object** o); |
| |
| static MUST_USE_RESULT MaybeHandle<JSObject> New( |
| Handle<JSFunction> constructor, Handle<JSReceiver> new_target, |
| Handle<AllocationSite> site = Handle<AllocationSite>::null()); |
| |
| static MaybeHandle<Context> GetFunctionRealm(Handle<JSObject> object); |
| |
| // [elements]: The elements (properties with names that are integers). |
| // |
| // Elements can be in two general modes: fast and slow. Each mode |
| // corresponds to a set of object representations of elements that |
| // have something in common. |
| // |
| // In the fast mode elements is a FixedArray and so each element can |
| // be quickly accessed. This fact is used in the generated code. The |
| // elements array can have one of three maps in this mode: |
| // fixed_array_map, sloppy_arguments_elements_map or |
| // fixed_cow_array_map (for copy-on-write arrays). In the latter case |
| // the elements array may be shared by a few objects and so before |
| // writing to any element the array must be copied. Use |
| // EnsureWritableFastElements in this case. |
| // |
| // In the slow mode the elements is either a NumberDictionary, a |
| // FixedArray parameter map for a (sloppy) arguments object. |
| DECL_ACCESSORS(elements, FixedArrayBase) |
| inline void initialize_elements(); |
| static inline void SetMapAndElements(Handle<JSObject> object, |
| Handle<Map> map, |
| Handle<FixedArrayBase> elements); |
| inline ElementsKind GetElementsKind(); |
| ElementsAccessor* GetElementsAccessor(); |
| // Returns true if an object has elements of PACKED_SMI_ELEMENTS or |
| // HOLEY_SMI_ELEMENTS ElementsKind. |
| inline bool HasSmiElements(); |
| // Returns true if an object has elements of PACKED_ELEMENTS or |
| // HOLEY_ELEMENTS ElementsKind. |
| inline bool HasObjectElements(); |
| // Returns true if an object has elements of PACKED_SMI_ELEMENTS, |
| // HOLEY_SMI_ELEMENTS, PACKED_ELEMENTS, or HOLEY_ELEMENTS. |
| inline bool HasSmiOrObjectElements(); |
| // Returns true if an object has any of the "fast" elements kinds. |
| inline bool HasFastElements(); |
| // Returns true if an object has elements of PACKED_DOUBLE_ELEMENTS or |
| // HOLEY_DOUBLE_ELEMENTS ElementsKind. |
| inline bool HasDoubleElements(); |
| // Returns true if an object has elements of HOLEY_SMI_ELEMENTS, |
| // HOLEY_DOUBLE_ELEMENTS, or HOLEY_ELEMENTS ElementsKind. |
| inline bool HasHoleyElements(); |
| inline bool HasSloppyArgumentsElements(); |
| inline bool HasStringWrapperElements(); |
| inline bool HasDictionaryElements(); |
| |
| inline bool HasFixedTypedArrayElements(); |
| |
| inline bool HasFixedUint8ClampedElements(); |
| inline bool HasFixedArrayElements(); |
| inline bool HasFixedInt8Elements(); |
| inline bool HasFixedUint8Elements(); |
| inline bool HasFixedInt16Elements(); |
| inline bool HasFixedUint16Elements(); |
| inline bool HasFixedInt32Elements(); |
| inline bool HasFixedUint32Elements(); |
| inline bool HasFixedFloat32Elements(); |
| inline bool HasFixedFloat64Elements(); |
| |
| inline bool HasFastArgumentsElements(); |
| inline bool HasSlowArgumentsElements(); |
| inline bool HasFastStringWrapperElements(); |
| inline bool HasSlowStringWrapperElements(); |
| bool HasEnumerableElements(); |
| |
| inline SeededNumberDictionary* element_dictionary(); // Gets slow elements. |
| |
| // Requires: HasFastElements(). |
| static void EnsureWritableFastElements(Handle<JSObject> object); |
| |
| MUST_USE_RESULT static Maybe<bool> SetPropertyWithInterceptor( |
| LookupIterator* it, ShouldThrow should_throw, Handle<Object> value); |
| |
| // The API currently still wants DefineOwnPropertyIgnoreAttributes to convert |
| // AccessorInfo objects to data fields. We allow FORCE_FIELD as an exception |
| // to the default behavior that calls the setter. |
| enum AccessorInfoHandling { FORCE_FIELD, DONT_FORCE_FIELD }; |
| |
| MUST_USE_RESULT static MaybeHandle<Object> DefineOwnPropertyIgnoreAttributes( |
| LookupIterator* it, Handle<Object> value, PropertyAttributes attributes, |
| AccessorInfoHandling handling = DONT_FORCE_FIELD); |
| |
| MUST_USE_RESULT static Maybe<bool> DefineOwnPropertyIgnoreAttributes( |
| LookupIterator* it, Handle<Object> value, PropertyAttributes attributes, |
| ShouldThrow should_throw, |
| AccessorInfoHandling handling = DONT_FORCE_FIELD); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> SetOwnPropertyIgnoreAttributes( |
| Handle<JSObject> object, Handle<Name> name, Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> SetOwnElementIgnoreAttributes( |
| Handle<JSObject> object, uint32_t index, Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| // Equivalent to one of the above depending on whether |name| can be converted |
| // to an array index. |
| MUST_USE_RESULT static MaybeHandle<Object> |
| DefinePropertyOrElementIgnoreAttributes(Handle<JSObject> object, |
| Handle<Name> name, |
| Handle<Object> value, |
| PropertyAttributes attributes = NONE); |
| |
| // Adds or reconfigures a property to attributes NONE. It will fail when it |
| // cannot. |
| MUST_USE_RESULT static Maybe<bool> CreateDataProperty( |
| LookupIterator* it, Handle<Object> value, |
| ShouldThrow should_throw = DONT_THROW); |
| |
| static void AddProperty(Handle<JSObject> object, Handle<Name> name, |
| Handle<Object> value, PropertyAttributes attributes); |
| |
| MUST_USE_RESULT static Maybe<bool> AddDataElement( |
| Handle<JSObject> receiver, uint32_t index, Handle<Object> value, |
| PropertyAttributes attributes, ShouldThrow should_throw); |
| MUST_USE_RESULT static MaybeHandle<Object> AddDataElement( |
| Handle<JSObject> receiver, uint32_t index, Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| // Extend the receiver with a single fast property appeared first in the |
| // passed map. This also extends the property backing store if necessary. |
| static void AllocateStorageForMap(Handle<JSObject> object, Handle<Map> map); |
| |
| // Migrates the given object to a map whose field representations are the |
| // lowest upper bound of all known representations for that field. |
| static void MigrateInstance(Handle<JSObject> instance); |
| |
| // Migrates the given object only if the target map is already available, |
| // or returns false if such a map is not yet available. |
| static bool TryMigrateInstance(Handle<JSObject> instance); |
| |
| // Sets the property value in a normalized object given (key, value, details). |
| // Handles the special representation of JS global objects. |
| static void SetNormalizedProperty(Handle<JSObject> object, Handle<Name> name, |
| Handle<Object> value, |
| PropertyDetails details); |
| static void SetDictionaryElement(Handle<JSObject> object, uint32_t index, |
| Handle<Object> value, |
| PropertyAttributes attributes); |
| static void SetDictionaryArgumentsElement(Handle<JSObject> object, |
| uint32_t index, |
| Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| static void OptimizeAsPrototype(Handle<JSObject> object); |
| static void ReoptimizeIfPrototype(Handle<JSObject> object); |
| static void MakePrototypesFast(Handle<Object> receiver, |
| WhereToStart where_to_start, Isolate* isolate); |
| static void LazyRegisterPrototypeUser(Handle<Map> user, Isolate* isolate); |
| static void UpdatePrototypeUserRegistration(Handle<Map> old_map, |
| Handle<Map> new_map, |
| Isolate* isolate); |
| static bool UnregisterPrototypeUser(Handle<Map> user, Isolate* isolate); |
| static void InvalidatePrototypeChains(Map* map); |
| |
| // Updates prototype chain tracking information when an object changes its |
| // map from |old_map| to |new_map|. |
| static void NotifyMapChange(Handle<Map> old_map, Handle<Map> new_map, |
| Isolate* isolate); |
| |
| // Utility used by many Array builtins and runtime functions |
| static inline bool PrototypeHasNoElements(Isolate* isolate, JSObject* object); |
| |
| // Alternative implementation of WeakFixedArray::NullCallback. |
| class PrototypeRegistryCompactionCallback { |
| public: |
| static void Callback(Object* value, int old_index, int new_index); |
| }; |
| |
| // Retrieve interceptors. |
| inline InterceptorInfo* GetNamedInterceptor(); |
| inline InterceptorInfo* GetIndexedInterceptor(); |
| |
| // Used from JSReceiver. |
| MUST_USE_RESULT static Maybe<PropertyAttributes> |
| GetPropertyAttributesWithInterceptor(LookupIterator* it); |
| MUST_USE_RESULT static Maybe<PropertyAttributes> |
| GetPropertyAttributesWithFailedAccessCheck(LookupIterator* it); |
| |
| // Defines an AccessorPair property on the given object. |
| // TODO(mstarzinger): Rename to SetAccessor(). |
| static MaybeHandle<Object> DefineAccessor(Handle<JSObject> object, |
| Handle<Name> name, |
| Handle<Object> getter, |
| Handle<Object> setter, |
| PropertyAttributes attributes); |
| static MaybeHandle<Object> DefineAccessor(LookupIterator* it, |
| Handle<Object> getter, |
| Handle<Object> setter, |
| PropertyAttributes attributes); |
| |
| // Defines an AccessorInfo property on the given object. |
| MUST_USE_RESULT static MaybeHandle<Object> SetAccessor( |
| Handle<JSObject> object, |
| Handle<AccessorInfo> info); |
| |
| // The result must be checked first for exceptions. If there's no exception, |
| // the output parameter |done| indicates whether the interceptor has a result |
| // or not. |
| MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithInterceptor( |
| LookupIterator* it, bool* done); |
| |
| static void ValidateElements(JSObject* object); |
| |
| // Makes sure that this object can contain HeapObject as elements. |
| static inline void EnsureCanContainHeapObjectElements(Handle<JSObject> obj); |
| |
| // Makes sure that this object can contain the specified elements. |
| static inline void EnsureCanContainElements( |
| Handle<JSObject> object, |
| Object** elements, |
| uint32_t count, |
| EnsureElementsMode mode); |
| static inline void EnsureCanContainElements( |
| Handle<JSObject> object, |
| Handle<FixedArrayBase> elements, |
| uint32_t length, |
| EnsureElementsMode mode); |
| static void EnsureCanContainElements( |
| Handle<JSObject> object, |
| Arguments* arguments, |
| uint32_t first_arg, |
| uint32_t arg_count, |
| EnsureElementsMode mode); |
| |
| // Would we convert a fast elements array to dictionary mode given |
| // an access at key? |
| bool WouldConvertToSlowElements(uint32_t index); |
| |
| static const uint32_t kMinAddedElementsCapacity = 16; |
| |
| // Computes the new capacity when expanding the elements of a JSObject. |
| static uint32_t NewElementsCapacity(uint32_t old_capacity) { |
| // (old_capacity + 50%) + kMinAddedElementsCapacity |
| return old_capacity + (old_capacity >> 1) + kMinAddedElementsCapacity; |
| } |
| |
| // These methods do not perform access checks! |
| template <AllocationSiteUpdateMode update_or_check = |
| AllocationSiteUpdateMode::kUpdate> |
| static bool UpdateAllocationSite(Handle<JSObject> object, |
| ElementsKind to_kind); |
| |
| // Lookup interceptors are used for handling properties controlled by host |
| // objects. |
| inline bool HasNamedInterceptor(); |
| inline bool HasIndexedInterceptor(); |
| |
| // Support functions for v8 api (needed for correct interceptor behavior). |
| MUST_USE_RESULT static Maybe<bool> HasRealNamedProperty( |
| Handle<JSObject> object, Handle<Name> name); |
| MUST_USE_RESULT static Maybe<bool> HasRealElementProperty( |
| Handle<JSObject> object, uint32_t index); |
| MUST_USE_RESULT static Maybe<bool> HasRealNamedCallbackProperty( |
| Handle<JSObject> object, Handle<Name> name); |
| |
| // Get the header size for a JSObject. Used to compute the index of |
| // embedder fields as well as the number of embedder fields. |
| static int GetHeaderSize(InstanceType instance_type); |
| inline int GetHeaderSize(); |
| |
| static inline int GetEmbedderFieldCount(const Map* map); |
| inline int GetEmbedderFieldCount() const; |
| inline int GetEmbedderFieldOffset(int index); |
| inline Object* GetEmbedderField(int index); |
| inline void SetEmbedderField(int index, Object* value); |
| inline void SetEmbedderField(int index, Smi* value); |
| bool WasConstructedFromApiFunction(); |
| |
| // Returns a new map with all transitions dropped from the object's current |
| // map and the ElementsKind set. |
| static Handle<Map> GetElementsTransitionMap(Handle<JSObject> object, |
| ElementsKind to_kind); |
| static void TransitionElementsKind(Handle<JSObject> object, |
| ElementsKind to_kind); |
| |
| // Always use this to migrate an object to a new map. |
| // |expected_additional_properties| is only used for fast-to-slow transitions |
| // and ignored otherwise. |
| static void MigrateToMap(Handle<JSObject> object, Handle<Map> new_map, |
| int expected_additional_properties = 0); |
| |
| // Forces a prototype without any of the checks that the regular SetPrototype |
| // would do. |
| static void ForceSetPrototype(Handle<JSObject> object, Handle<Object> proto); |
| |
| // Convert the object to use the canonical dictionary |
| // representation. If the object is expected to have additional properties |
| // added this number can be indicated to have the backing store allocated to |
| // an initial capacity for holding these properties. |
| static void NormalizeProperties(Handle<JSObject> object, |
| PropertyNormalizationMode mode, |
| int expected_additional_properties, |
| const char* reason); |
| |
| // Convert and update the elements backing store to be a |
| // SeededNumberDictionary dictionary. Returns the backing after conversion. |
| static Handle<SeededNumberDictionary> NormalizeElements( |
| Handle<JSObject> object); |
| |
| void RequireSlowElements(SeededNumberDictionary* dictionary); |
| |
| // Transform slow named properties to fast variants. |
| static void MigrateSlowToFast(Handle<JSObject> object, |
| int unused_property_fields, const char* reason); |
| |
| inline bool IsUnboxedDoubleField(FieldIndex index); |
| |
| // Access fast-case object properties at index. |
| static Handle<Object> FastPropertyAt(Handle<JSObject> object, |
| Representation representation, |
| FieldIndex index); |
| inline Object* RawFastPropertyAt(FieldIndex index); |
| inline double RawFastDoublePropertyAt(FieldIndex index); |
| inline uint64_t RawFastDoublePropertyAsBitsAt(FieldIndex index); |
| |
| inline void FastPropertyAtPut(FieldIndex index, Object* value); |
| inline void RawFastPropertyAtPut(FieldIndex index, Object* value); |
| inline void RawFastDoublePropertyAsBitsAtPut(FieldIndex index, uint64_t bits); |
| inline void WriteToField(int descriptor, PropertyDetails details, |
| Object* value); |
| |
| // Access to in object properties. |
| inline int GetInObjectPropertyOffset(int index); |
| inline Object* InObjectPropertyAt(int index); |
| inline Object* InObjectPropertyAtPut(int index, |
| Object* value, |
| WriteBarrierMode mode |
| = UPDATE_WRITE_BARRIER); |
| |
| // Set the object's prototype (only JSReceiver and null are allowed values). |
| MUST_USE_RESULT static Maybe<bool> SetPrototype(Handle<JSObject> object, |
| Handle<Object> value, |
| bool from_javascript, |
| ShouldThrow should_throw); |
| |
| // Makes the object prototype immutable |
| // Never called from JavaScript |
| static void SetImmutableProto(Handle<JSObject> object); |
| |
| // Initializes the body starting at |start_offset|. It is responsibility of |
| // the caller to initialize object header. Fill the pre-allocated fields with |
| // pre_allocated_value and the rest with filler_value. |
| // Note: this call does not update write barrier, the caller is responsible |
| // to ensure that |filler_value| can be collected without WB here. |
| inline void InitializeBody(Map* map, int start_offset, |
| Object* pre_allocated_value, Object* filler_value); |
| |
| // Check whether this object references another object |
| bool ReferencesObject(Object* obj); |
| |
| MUST_USE_RESULT static Maybe<bool> TestIntegrityLevel(Handle<JSObject> object, |
| IntegrityLevel lvl); |
| |
| MUST_USE_RESULT static Maybe<bool> PreventExtensions( |
| Handle<JSObject> object, ShouldThrow should_throw); |
| |
| static bool IsExtensible(Handle<JSObject> object); |
| |
| DECL_CAST(JSObject) |
| |
| // Dispatched behavior. |
| void JSObjectShortPrint(StringStream* accumulator); |
| DECL_PRINTER(JSObject) |
| DECL_VERIFIER(JSObject) |
| #ifdef OBJECT_PRINT |
| bool PrintProperties(std::ostream& os); // NOLINT |
| void PrintElements(std::ostream& os); // NOLINT |
| #endif |
| #if defined(DEBUG) || defined(OBJECT_PRINT) |
| void PrintTransitions(std::ostream& os); // NOLINT |
| #endif |
| |
| static void PrintElementsTransition( |
| FILE* file, Handle<JSObject> object, |
| ElementsKind from_kind, Handle<FixedArrayBase> from_elements, |
| ElementsKind to_kind, Handle<FixedArrayBase> to_elements); |
| |
| void PrintInstanceMigration(FILE* file, Map* original_map, Map* new_map); |
| |
| #ifdef DEBUG |
| // Structure for collecting spill information about JSObjects. |
| class SpillInformation { |
| public: |
| void Clear(); |
| void Print(); |
| int number_of_objects_; |
| int number_of_objects_with_fast_properties_; |
| int number_of_objects_with_fast_elements_; |
| int number_of_fast_used_fields_; |
| int number_of_fast_unused_fields_; |
| int number_of_slow_used_properties_; |
| int number_of_slow_unused_properties_; |
| int number_of_fast_used_elements_; |
| int number_of_fast_unused_elements_; |
| int number_of_slow_used_elements_; |
| int number_of_slow_unused_elements_; |
| }; |
| |
| void IncrementSpillStatistics(SpillInformation* info); |
| #endif |
| |
| #ifdef VERIFY_HEAP |
| // If a GC was caused while constructing this object, the elements pointer |
| // may point to a one pointer filler map. The object won't be rooted, but |
| // our heap verification code could stumble across it. |
| bool ElementsAreSafeToExamine(); |
| #endif |
| |
| Object* SlowReverseLookup(Object* value); |
| |
| // Maximal number of elements (numbered 0 .. kMaxElementCount - 1). |
| // Also maximal value of JSArray's length property. |
| static const uint32_t kMaxElementCount = 0xffffffffu; |
| |
| // Constants for heuristics controlling conversion of fast elements |
| // to slow elements. |
| |
| // Maximal gap that can be introduced by adding an element beyond |
| // the current elements length. |
| static const uint32_t kMaxGap = 1024; |
| |
| // Maximal length of fast elements array that won't be checked for |
| // being dense enough on expansion. |
| static const int kMaxUncheckedFastElementsLength = 5000; |
| |
| // Same as above but for old arrays. This limit is more strict. We |
| // don't want to be wasteful with long lived objects. |
| static const int kMaxUncheckedOldFastElementsLength = 500; |
| |
| // This constant applies only to the initial map of "global.Object" and |
| // not to arbitrary other JSObject maps. |
| static const int kInitialGlobalObjectUnusedPropertiesCount = 4; |
| |
| static const int kMaxInstanceSize = 255 * kPointerSize; |
| |
| // When extending the backing storage for property values, we increase |
| // its size by more than the 1 entry necessary, so sequentially adding fields |
| // to the same object requires fewer allocations and copies. |
| static const int kFieldsAdded = 3; |
| |
| // Layout description. |
| static const int kElementsOffset = JSReceiver::kHeaderSize; |
| static const int kHeaderSize = kElementsOffset + kPointerSize; |
| |
| STATIC_ASSERT(kHeaderSize == Internals::kJSObjectHeaderSize); |
| static const int kMaxInObjectProperties = |
| (kMaxInstanceSize - kHeaderSize) >> kPointerSizeLog2; |
| |
| class BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| class FastBodyDescriptor; |
| // No weak fields. |
| typedef FastBodyDescriptor FastBodyDescriptorWeak; |
| |
| // Gets the number of currently used elements. |
| int GetFastElementsUsage(); |
| |
| static bool AllCanRead(LookupIterator* it); |
| static bool AllCanWrite(LookupIterator* it); |
| |
| private: |
| friend class JSReceiver; |
| friend class Object; |
| |
| // Used from Object::GetProperty(). |
| MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithFailedAccessCheck( |
| LookupIterator* it); |
| |
| MUST_USE_RESULT static Maybe<bool> SetPropertyWithFailedAccessCheck( |
| LookupIterator* it, Handle<Object> value, ShouldThrow should_throw); |
| |
| MUST_USE_RESULT static Maybe<bool> DeletePropertyWithInterceptor( |
| LookupIterator* it, ShouldThrow should_throw); |
| |
| bool ReferencesObjectFromElements(FixedArray* elements, |
| ElementsKind kind, |
| Object* object); |
| |
| Object* GetIdentityHash(Isolate* isolate); |
| |
| Smi* GetOrCreateIdentityHash(Isolate* isolate); |
| |
| // Helper for fast versions of preventExtensions, seal, and freeze. |
| // attrs is one of NONE, SEALED, or FROZEN (depending on the operation). |
| template <PropertyAttributes attrs> |
| MUST_USE_RESULT static Maybe<bool> PreventExtensionsWithTransition( |
| Handle<JSObject> object, ShouldThrow should_throw); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSObject); |
| }; |
| |
| |
| // JSAccessorPropertyDescriptor is just a JSObject with a specific initial |
| // map. This initial map adds in-object properties for "get", "set", |
| // "enumerable" and "configurable" properties, as assigned by the |
| // FromPropertyDescriptor function for regular accessor properties. |
| class JSAccessorPropertyDescriptor: public JSObject { |
| public: |
| // Offsets of object fields. |
| static const int kGetOffset = JSObject::kHeaderSize; |
| static const int kSetOffset = kGetOffset + kPointerSize; |
| static const int kEnumerableOffset = kSetOffset + kPointerSize; |
| static const int kConfigurableOffset = kEnumerableOffset + kPointerSize; |
| static const int kSize = kConfigurableOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kGetIndex = 0; |
| static const int kSetIndex = 1; |
| static const int kEnumerableIndex = 2; |
| static const int kConfigurableIndex = 3; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSAccessorPropertyDescriptor); |
| }; |
| |
| |
| // JSDataPropertyDescriptor is just a JSObject with a specific initial map. |
| // This initial map adds in-object properties for "value", "writable", |
| // "enumerable" and "configurable" properties, as assigned by the |
| // FromPropertyDescriptor function for regular data properties. |
| class JSDataPropertyDescriptor: public JSObject { |
| public: |
| // Offsets of object fields. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kWritableOffset = kValueOffset + kPointerSize; |
| static const int kEnumerableOffset = kWritableOffset + kPointerSize; |
| static const int kConfigurableOffset = kEnumerableOffset + kPointerSize; |
| static const int kSize = kConfigurableOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kValueIndex = 0; |
| static const int kWritableIndex = 1; |
| static const int kEnumerableIndex = 2; |
| static const int kConfigurableIndex = 3; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSDataPropertyDescriptor); |
| }; |
| |
| |
| // JSIteratorResult is just a JSObject with a specific initial map. |
| // This initial map adds in-object properties for "done" and "value", |
| // as specified by ES6 section 25.1.1.3 The IteratorResult Interface |
| class JSIteratorResult: public JSObject { |
| public: |
| DECL_ACCESSORS(value, Object) |
| |
| DECL_ACCESSORS(done, Object) |
| |
| // Offsets of object fields. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kDoneOffset = kValueOffset + kPointerSize; |
| static const int kSize = kDoneOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kValueIndex = 0; |
| static const int kDoneIndex = 1; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSIteratorResult); |
| }; |
| |
| |
| // Common superclass for FixedArrays that allow implementations to share |
| // common accessors and some code paths. |
| class FixedArrayBase: public HeapObject { |
| public: |
| // [length]: length of the array. |
| inline int length() const; |
| inline void set_length(int value); |
| |
| // Get and set the length using acquire loads and release stores. |
| inline int synchronized_length() const; |
| inline void synchronized_set_length(int value); |
| |
| DECL_CAST(FixedArrayBase) |
| |
| static int GetMaxLengthForNewSpaceAllocation(ElementsKind kind); |
| |
| bool IsCowArray() const; |
| |
| // Layout description. |
| // Length is smi tagged when it is stored. |
| static const int kLengthOffset = HeapObject::kHeaderSize; |
| static const int kHeaderSize = kLengthOffset + kPointerSize; |
| }; |
| |
| |
| class FixedDoubleArray; |
| class IncrementalMarking; |
| |
| |
| // FixedArray describes fixed-sized arrays with element type Object*. |
| class FixedArray: public FixedArrayBase { |
| public: |
| // Setter and getter for elements. |
| inline Object* get(int index) const; |
| static inline Handle<Object> get(FixedArray* array, int index, |
| Isolate* isolate); |
| template <class T> |
| MaybeHandle<T> GetValue(Isolate* isolate, int index) const; |
| |
| template <class T> |
| Handle<T> GetValueChecked(Isolate* isolate, int index) const; |
| |
| // Return a grown copy if the index is bigger than the array's length. |
| static Handle<FixedArray> SetAndGrow(Handle<FixedArray> array, int index, |
| Handle<Object> value); |
| |
| // Setter that uses write barrier. |
| inline void set(int index, Object* value); |
| inline bool is_the_hole(Isolate* isolate, int index); |
| |
| // Setter that doesn't need write barrier. |
| inline void set(int index, Smi* value); |
| // Setter with explicit barrier mode. |
| inline void set(int index, Object* value, WriteBarrierMode mode); |
| |
| // Setters for frequently used oddballs located in old space. |
| inline void set_undefined(int index); |
| inline void set_undefined(Isolate* isolate, int index); |
| inline void set_null(int index); |
| inline void set_null(Isolate* isolate, int index); |
| inline void set_the_hole(int index); |
| inline void set_the_hole(Isolate* isolate, int index); |
| |
| inline Object** GetFirstElementAddress(); |
| inline bool ContainsOnlySmisOrHoles(); |
| |
| // Gives access to raw memory which stores the array's data. |
| inline Object** data_start(); |
| |
| inline void FillWithHoles(int from, int to); |
| |
| // Shrink length and insert filler objects. |
| void Shrink(int length); |
| |
| // Copy a sub array from the receiver to dest. |
| void CopyTo(int pos, FixedArray* dest, int dest_pos, int len) const; |
| |
| // Garbage collection support. |
| static constexpr int SizeFor(int length) { |
| return kHeaderSize + length * kPointerSize; |
| } |
| |
| // Code Generation support. |
| static constexpr int OffsetOfElementAt(int index) { return SizeFor(index); } |
| |
| // Garbage collection support. |
| inline Object** RawFieldOfElementAt(int index); |
| |
| DECL_CAST(FixedArray) |
| |
| // Maximal allowed size, in bytes, of a single FixedArray. |
| // Prevents overflowing size computations, as well as extreme memory |
| // consumption. |
| static const int kMaxSize = 128 * MB * kPointerSize; |
| // Maximally allowed length of a FixedArray. |
| static const int kMaxLength = (kMaxSize - kHeaderSize) / kPointerSize; |
| // Maximally allowed length for regular (non large object space) object. |
| STATIC_ASSERT(kMaxRegularHeapObjectSize < kMaxSize); |
| static const int kMaxRegularLength = |
| (kMaxRegularHeapObjectSize - kHeaderSize) / kPointerSize; |
| |
| // Dispatched behavior. |
| DECL_PRINTER(FixedArray) |
| DECL_VERIFIER(FixedArray) |
| #ifdef DEBUG |
| // Checks if two FixedArrays have identical contents. |
| bool IsEqualTo(FixedArray* other); |
| #endif |
| |
| typedef FlexibleBodyDescriptor<kHeaderSize> BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| protected: |
| // Set operation on FixedArray without using write barriers. Can |
| // only be used for storing old space objects or smis. |
| static inline void NoWriteBarrierSet(FixedArray* array, |
| int index, |
| Object* value); |
| |
| private: |
| STATIC_ASSERT(kHeaderSize == Internals::kFixedArrayHeaderSize); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedArray); |
| }; |
| |
| // FixedDoubleArray describes fixed-sized arrays with element type double. |
| class FixedDoubleArray: public FixedArrayBase { |
| public: |
| // Setter and getter for elements. |
| inline double get_scalar(int index); |
| inline uint64_t get_representation(int index); |
| static inline Handle<Object> get(FixedDoubleArray* array, int index, |
| Isolate* isolate); |
| inline void set(int index, double value); |
| inline void set_the_hole(Isolate* isolate, int index); |
| inline void set_the_hole(int index); |
| |
| // Checking for the hole. |
| inline bool is_the_hole(Isolate* isolate, int index); |
| inline bool is_the_hole(int index); |
| |
| // Garbage collection support. |
| inline static int SizeFor(int length) { |
| return kHeaderSize + length * kDoubleSize; |
| } |
| |
| // Gives access to raw memory which stores the array's data. |
| inline double* data_start(); |
| |
| inline void FillWithHoles(int from, int to); |
| |
| // Code Generation support. |
| static int OffsetOfElementAt(int index) { return SizeFor(index); } |
| |
| DECL_CAST(FixedDoubleArray) |
| |
| // Maximal allowed size, in bytes, of a single FixedDoubleArray. |
| // Prevents overflowing size computations, as well as extreme memory |
| // consumption. |
| static const int kMaxSize = 512 * MB; |
| // Maximally allowed length of a FixedArray. |
| static const int kMaxLength = (kMaxSize - kHeaderSize) / kDoubleSize; |
| |
| // Dispatched behavior. |
| DECL_PRINTER(FixedDoubleArray) |
| DECL_VERIFIER(FixedDoubleArray) |
| |
| class BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedDoubleArray); |
| }; |
| |
| class WeakFixedArray : public FixedArray { |
| public: |
| // If |maybe_array| is not a WeakFixedArray, a fresh one will be allocated. |
| // This function does not check if the value exists already, callers must |
| // ensure this themselves if necessary. |
| static Handle<WeakFixedArray> Add(Handle<Object> maybe_array, |
| Handle<HeapObject> value, |
| int* assigned_index = NULL); |
| |
| // Returns true if an entry was found and removed. |
| bool Remove(Handle<HeapObject> value); |
| |
| class NullCallback { |
| public: |
| static void Callback(Object* value, int old_index, int new_index) {} |
| }; |
| |
| template <class CompactionCallback> |
| void Compact(); |
| |
| inline Object* Get(int index) const; |
| inline void Clear(int index); |
| inline int Length() const; |
| |
| inline bool IsEmptySlot(int index) const; |
| static Object* Empty() { return Smi::kZero; } |
| |
| class Iterator { |
| public: |
| explicit Iterator(Object* maybe_array) : list_(NULL) { Reset(maybe_array); } |
| void Reset(Object* maybe_array); |
| |
| template <class T> |
| inline T* Next(); |
| |
| private: |
| int index_; |
| WeakFixedArray* list_; |
| #ifdef DEBUG |
| int last_used_index_; |
| DisallowHeapAllocation no_gc_; |
| #endif // DEBUG |
| DISALLOW_COPY_AND_ASSIGN(Iterator); |
| }; |
| |
| DECL_CAST(WeakFixedArray) |
| |
| private: |
| static const int kLastUsedIndexIndex = 0; |
| static const int kFirstIndex = 1; |
| |
| static Handle<WeakFixedArray> Allocate( |
| Isolate* isolate, int size, Handle<WeakFixedArray> initialize_from); |
| |
| static void Set(Handle<WeakFixedArray> array, int index, |
| Handle<HeapObject> value); |
| inline void clear(int index); |
| |
| inline int last_used_index() const; |
| inline void set_last_used_index(int index); |
| |
| // Disallow inherited setters. |
| void set(int index, Smi* value); |
| void set(int index, Object* value); |
| void set(int index, Object* value, WriteBarrierMode mode); |
| DISALLOW_IMPLICIT_CONSTRUCTORS(WeakFixedArray); |
| }; |
| |
| // Generic array grows dynamically with O(1) amortized insertion. |
| // |
| // ArrayList is a FixedArray with static convenience methods for adding more |
| // elements. The Length() method returns the number of elements in the list, not |
| // the allocated size. The number of elements is stored at kLengthIndex and is |
| // updated with every insertion. The elements of the ArrayList are stored in the |
| // underlying FixedArray starting at kFirstIndex. |
| class ArrayList : public FixedArray { |
| public: |
| enum AddMode { |
| kNone, |
| // Use this if GC can delete elements from the array. |
| kReloadLengthAfterAllocation, |
| }; |
| static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj, |
| AddMode mode = kNone); |
| static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj1, |
| Handle<Object> obj2, AddMode = kNone); |
| static Handle<ArrayList> New(Isolate* isolate, int size); |
| |
| // Returns the number of elements in the list, not the allocated size, which |
| // is length(). Lower and upper case length() return different results! |
| inline int Length() const; |
| |
| // Sets the Length() as used by Elements(). Does not change the underlying |
| // storage capacity, i.e., length(). |
| inline void SetLength(int length); |
| inline Object* Get(int index) const; |
| inline Object** Slot(int index); |
| |
| // Set the element at index to obj. The underlying array must be large enough. |
| // If you need to grow the ArrayList, use the static Add() methods instead. |
| inline void Set(int index, Object* obj, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| |
| // Set the element at index to undefined. This does not change the Length(). |
| inline void Clear(int index, Object* undefined); |
| |
| // Return a copy of the list of size Length() without the first entry. The |
| // number returned by Length() is stored in the first entry. |
| static Handle<FixedArray> Elements(Handle<ArrayList> array); |
| bool IsFull(); |
| DECL_CAST(ArrayList) |
| |
| private: |
| static Handle<ArrayList> EnsureSpace(Handle<ArrayList> array, int length); |
| static const int kLengthIndex = 0; |
| static const int kFirstIndex = 1; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ArrayList); |
| }; |
| |
| enum SearchMode { ALL_ENTRIES, VALID_ENTRIES }; |
| |
| template <SearchMode search_mode, typename T> |
| inline int Search(T* array, Name* name, int valid_entries = 0, |
| int* out_insertion_index = NULL); |
| |
| // HandlerTable is a fixed array containing entries for exception handlers in |
| // the code object it is associated with. The tables comes in two flavors: |
| // 1) Based on ranges: Used for unoptimized code. Contains one entry per |
| // exception handler and a range representing the try-block covered by that |
| // handler. Layout looks as follows: |
| // [ range-start , range-end , handler-offset , handler-data ] |
| // 2) Based on return addresses: Used for turbofanned code. Contains one entry |
| // per call-site that could throw an exception. Layout looks as follows: |
| // [ return-address-offset , handler-offset ] |
| class HandlerTable : public FixedArray { |
| public: |
| // Conservative prediction whether a given handler will locally catch an |
| // exception or cause a re-throw to outside the code boundary. Since this is |
| // undecidable it is merely an approximation (e.g. useful for debugger). |
| enum CatchPrediction { |
| UNCAUGHT, // The handler will (likely) rethrow the exception. |
| CAUGHT, // The exception will be caught by the handler. |
| PROMISE, // The exception will be caught and cause a promise rejection. |
| DESUGARING, // The exception will be caught, but both the exception and the |
| // catching are part of a desugaring and should therefore not |
| // be visible to the user (we won't notify the debugger of such |
| // exceptions). |
| ASYNC_AWAIT, // The exception will be caught and cause a promise rejection |
| // in the desugaring of an async function, so special |
| // async/await handling in the debugger can take place. |
| }; |
| |
| // Getters for handler table based on ranges. |
| inline int GetRangeStart(int index) const; |
| inline int GetRangeEnd(int index) const; |
| inline int GetRangeHandler(int index) const; |
| inline int GetRangeData(int index) const; |
| |
| // Setters for handler table based on ranges. |
| inline void SetRangeStart(int index, int value); |
| inline void SetRangeEnd(int index, int value); |
| inline void SetRangeHandler(int index, int offset, CatchPrediction pred); |
| inline void SetRangeData(int index, int value); |
| |
| // Setters for handler table based on return addresses. |
| inline void SetReturnOffset(int index, int value); |
| inline void SetReturnHandler(int index, int offset); |
| |
| // Lookup handler in a table based on ranges. The {pc_offset} is an offset to |
| // the start of the potentially throwing instruction (using return addresses |
| // for this value would be invalid). |
| int LookupRange(int pc_offset, int* data, CatchPrediction* prediction); |
| |
| // Lookup handler in a table based on return addresses. |
| int LookupReturn(int pc_offset); |
| |
| // Returns the number of entries in the table. |
| inline int NumberOfRangeEntries() const; |
| |
| // Returns the required length of the underlying fixed array. |
| static int LengthForRange(int entries) { return entries * kRangeEntrySize; } |
| static int LengthForReturn(int entries) { return entries * kReturnEntrySize; } |
| |
| DECL_CAST(HandlerTable) |
| |
| #ifdef ENABLE_DISASSEMBLER |
| void HandlerTableRangePrint(std::ostream& os); // NOLINT |
| void HandlerTableReturnPrint(std::ostream& os); // NOLINT |
| #endif |
| |
| private: |
| // Layout description for handler table based on ranges. |
| static const int kRangeStartIndex = 0; |
| static const int kRangeEndIndex = 1; |
| static const int kRangeHandlerIndex = 2; |
| static const int kRangeDataIndex = 3; |
| static const int kRangeEntrySize = 4; |
| |
| // Layout description for handler table based on return addresses. |
| static const int kReturnOffsetIndex = 0; |
| static const int kReturnHandlerIndex = 1; |
| static const int kReturnEntrySize = 2; |
| |
| // Encoding of the {handler} field. |
| class HandlerPredictionField : public BitField<CatchPrediction, 0, 3> {}; |
| class HandlerOffsetField : public BitField<int, 3, 29> {}; |
| }; |
| |
| // ByteArray represents fixed sized byte arrays. Used for the relocation info |
| // that is attached to code objects. |
| class ByteArray: public FixedArrayBase { |
| public: |
| inline int Size(); |
| |
| // Setter and getter. |
| inline byte get(int index) const; |
| inline void set(int index, byte value); |
| |
| // Copy in / copy out whole byte slices. |
| inline void copy_out(int index, byte* buffer, int length); |
| inline void copy_in(int index, const byte* buffer, int length); |
| |
| // Treat contents as an int array. |
| inline int get_int(int index) const; |
| inline void set_int(int index, int value); |
| |
| inline uint32_t get_uint32(int index) const; |
| inline void set_uint32(int index, uint32_t value); |
| |
| // Clear uninitialized padding space. This ensures that the snapshot content |
| // is deterministic. |
| inline void clear_padding(); |
| |
| static int SizeFor(int length) { |
| return OBJECT_POINTER_ALIGN(kHeaderSize + length); |
| } |
| // We use byte arrays for free blocks in the heap. Given a desired size in |
| // bytes that is a multiple of the word size and big enough to hold a byte |
| // array, this function returns the number of elements a byte array should |
| // have. |
| static int LengthFor(int size_in_bytes) { |
| DCHECK(IsAligned(size_in_bytes, kPointerSize)); |
| DCHECK(size_in_bytes >= kHeaderSize); |
| return size_in_bytes - kHeaderSize; |
| } |
| |
| // Returns data start address. |
| inline Address GetDataStartAddress(); |
| |
| inline int DataSize() const; |
| |
| // Returns a pointer to the ByteArray object for a given data start address. |
| static inline ByteArray* FromDataStartAddress(Address address); |
| |
| DECL_CAST(ByteArray) |
| |
| // Dispatched behavior. |
| inline int ByteArraySize(); |
| DECL_PRINTER(ByteArray) |
| DECL_VERIFIER(ByteArray) |
| |
| // Layout description. |
| static const int kAlignedSize = OBJECT_POINTER_ALIGN(kHeaderSize); |
| |
| // Maximal memory consumption for a single ByteArray. |
| static const int kMaxSize = 512 * MB; |
| // Maximal length of a single ByteArray. |
| static const int kMaxLength = kMaxSize - kHeaderSize; |
| |
| class BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ByteArray); |
| }; |
| |
| // Wrapper class for ByteArray which can store arbitrary C++ classes, as long |
| // as they can be copied with memcpy. |
| template <class T> |
| class PodArray : public ByteArray { |
| public: |
| static Handle<PodArray<T>> New(Isolate* isolate, int length, |
| PretenureFlag pretenure = NOT_TENURED); |
| void copy_out(int index, T* result) { |
| ByteArray::copy_out(index * sizeof(T), reinterpret_cast<byte*>(result), |
| sizeof(T)); |
| } |
| T get(int index) { |
| T result; |
| copy_out(index, &result); |
| return result; |
| } |
| void set(int index, const T& value) { |
| copy_in(index * sizeof(T), reinterpret_cast<const byte*>(&value), |
| sizeof(T)); |
| } |
| int length() { return ByteArray::length() / sizeof(T); } |
| DECL_CAST(PodArray<T>) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PodArray<T>); |
| }; |
| |
| // BytecodeArray represents a sequence of interpreter bytecodes. |
| class BytecodeArray : public FixedArrayBase { |
| public: |
| enum Age { |
| kNoAgeBytecodeAge = 0, |
| kQuadragenarianBytecodeAge, |
| kQuinquagenarianBytecodeAge, |
| kSexagenarianBytecodeAge, |
| kSeptuagenarianBytecodeAge, |
| kOctogenarianBytecodeAge, |
| kAfterLastBytecodeAge, |
| kFirstBytecodeAge = kNoAgeBytecodeAge, |
| kLastBytecodeAge = kAfterLastBytecodeAge - 1, |
| kBytecodeAgeCount = kAfterLastBytecodeAge - kFirstBytecodeAge - 1, |
| kIsOldBytecodeAge = kSexagenarianBytecodeAge |
| }; |
| |
| static int SizeFor(int length) { |
| return OBJECT_POINTER_ALIGN(kHeaderSize + length); |
| } |
| |
| // Setter and getter |
| inline byte get(int index); |
| inline void set(int index, byte value); |
| |
| // Returns data start address. |
| inline Address GetFirstBytecodeAddress(); |
| |
| // Accessors for frame size. |
| inline int frame_size() const; |
| inline void set_frame_size(int frame_size); |
| |
| // Accessor for register count (derived from frame_size). |
| inline int register_count() const; |
| |
| // Accessors for parameter count (including implicit 'this' receiver). |
| inline int parameter_count() const; |
| inline void set_parameter_count(int number_of_parameters); |
| |
| // Register used to pass the incoming new.target or generator object from the |
| // fucntion call. |
| inline interpreter::Register incoming_new_target_or_generator_register() |
| const; |
| inline void set_incoming_new_target_or_generator_register( |
| interpreter::Register incoming_new_target_or_generator_register); |
| |
| // Accessors for profiling count. |
| inline int interrupt_budget() const; |
| inline void set_interrupt_budget(int interrupt_budget); |
| |
| // Accessors for OSR loop nesting level. |
| inline int osr_loop_nesting_level() const; |
| inline void set_osr_loop_nesting_level(int depth); |
| |
| // Accessors for bytecode's code age. |
| inline Age bytecode_age() const; |
| inline void set_bytecode_age(Age age); |
| |
| // Accessors for the constant pool. |
| DECL_ACCESSORS(constant_pool, FixedArray) |
| |
| // Accessors for handler table containing offsets of exception handlers. |
| DECL_ACCESSORS(handler_table, FixedArray) |
| |
| // Accessors for source position table containing mappings between byte code |
| // offset and source position or SourcePositionTableWithFrameCache. |
| DECL_ACCESSORS(source_position_table, Object) |
| |
| inline ByteArray* SourcePositionTable(); |
| |
| DECL_CAST(BytecodeArray) |
| |
| // Dispatched behavior. |
| inline int BytecodeArraySize(); |
| |
| inline int instruction_size(); |
| |
| // Returns the size of bytecode and its metadata. This includes the size of |
| // bytecode, constant pool, source position table, and handler table. |
| inline int SizeIncludingMetadata(); |
| |
| int SourcePosition(int offset); |
| int SourceStatementPosition(int offset); |
| |
| DECL_PRINTER(BytecodeArray) |
| DECL_VERIFIER(BytecodeArray) |
| |
| void Disassemble(std::ostream& os); |
| |
| void CopyBytecodesTo(BytecodeArray* to); |
| |
| // Bytecode aging |
| bool IsOld() const; |
| void MakeOlder(); |
| |
| // Clear uninitialized padding space. This ensures that the snapshot content |
| // is deterministic. |
| inline void clear_padding(); |
| |
| // Layout description. |
| #define BYTECODE_ARRAY_FIELDS(V) \ |
| /* Pointer fields. */ \ |
| V(kConstantPoolOffset, kPointerSize) \ |
| V(kHandlerTableOffset, kPointerSize) \ |
| V(kSourcePositionTableOffset, kPointerSize) \ |
| V(kFrameSizeOffset, kIntSize) \ |
| V(kParameterSizeOffset, kIntSize) \ |
| V(kIncomingNewTargetOrGeneratorRegisterOffset, kIntSize) \ |
| V(kInterruptBudgetOffset, kIntSize) \ |
| V(kOSRNestingLevelOffset, kCharSize) \ |
| V(kBytecodeAgeOffset, kCharSize) \ |
| /* Total size. */ \ |
| V(kHeaderSize, 0) |
| |
| DEFINE_FIELD_OFFSET_CONSTANTS(FixedArrayBase::kHeaderSize, |
| BYTECODE_ARRAY_FIELDS) |
| #undef BYTECODE_ARRAY_FIELDS |
| |
| // Maximal memory consumption for a single BytecodeArray. |
| static const int kMaxSize = 512 * MB; |
| // Maximal length of a single BytecodeArray. |
| static const int kMaxLength = kMaxSize - kHeaderSize; |
| |
| class BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeArray); |
| }; |
| |
| |
| // FreeSpace are fixed-size free memory blocks used by the heap and GC. |
| // They look like heap objects (are heap object tagged and have a map) so that |
| // the heap remains iterable. They have a size and a next pointer. |
| // The next pointer is the raw address of the next FreeSpace object (or NULL) |
| // in the free list. |
| class FreeSpace: public HeapObject { |
| public: |
| // [size]: size of the free space including the header. |
| inline int size() const; |
| inline void set_size(int value); |
| |
| inline int relaxed_read_size() const; |
| inline void relaxed_write_size(int value); |
| |
| inline int Size(); |
| |
| // Accessors for the next field. |
| inline FreeSpace* next(); |
| inline void set_next(FreeSpace* next); |
| |
| inline static FreeSpace* cast(HeapObject* obj); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(FreeSpace) |
| DECL_VERIFIER(FreeSpace) |
| |
| // Layout description. |
| // Size is smi tagged when it is stored. |
| static const int kSizeOffset = HeapObject::kHeaderSize; |
| static const int kNextOffset = POINTER_SIZE_ALIGN(kSizeOffset + kPointerSize); |
| static const int kSize = kNextOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FreeSpace); |
| }; |
| |
| |
| // V has parameters (Type, type, TYPE, C type, element_size) |
| #define TYPED_ARRAYS(V) \ |
| V(Uint8, uint8, UINT8, uint8_t, 1) \ |
| V(Int8, int8, INT8, int8_t, 1) \ |
| V(Uint16, uint16, UINT16, uint16_t, 2) \ |
| V(Int16, int16, INT16, int16_t, 2) \ |
| V(Uint32, uint32, UINT32, uint32_t, 4) \ |
| V(Int32, int32, INT32, int32_t, 4) \ |
| V(Float32, float32, FLOAT32, float, 4) \ |
| V(Float64, float64, FLOAT64, double, 8) \ |
| V(Uint8Clamped, uint8_clamped, UINT8_CLAMPED, uint8_t, 1) |
| |
| |
| class FixedTypedArrayBase: public FixedArrayBase { |
| public: |
| // [base_pointer]: Either points to the FixedTypedArrayBase itself or nullptr. |
| DECL_ACCESSORS(base_pointer, Object) |
| |
| // [external_pointer]: Contains the offset between base_pointer and the start |
| // of the data. If the base_pointer is a nullptr, the external_pointer |
| // therefore points to the actual backing store. |
| DECL_ACCESSORS(external_pointer, void) |
| |
| // Dispatched behavior. |
| DECL_CAST(FixedTypedArrayBase) |
| |
| static const int kBasePointerOffset = FixedArrayBase::kHeaderSize; |
| static const int kExternalPointerOffset = kBasePointerOffset + kPointerSize; |
| static const int kHeaderSize = |
| DOUBLE_POINTER_ALIGN(kExternalPointerOffset + kPointerSize); |
| |
| static const int kDataOffset = kHeaderSize; |
| |
| static const int kMaxElementSize = 8; |
| |
| #ifdef V8_HOST_ARCH_32_BIT |
| static const size_t kMaxByteLength = std::numeric_limits<size_t>::max(); |
| #else |
| static const size_t kMaxByteLength = |
| static_cast<size_t>(Smi::kMaxValue) * kMaxElementSize; |
| #endif // V8_HOST_ARCH_32_BIT |
| |
| static const size_t kMaxLength = Smi::kMaxValue; |
| |
| class BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| inline int size() const; |
| |
| static inline int TypedArraySize(InstanceType type, int length); |
| inline int TypedArraySize(InstanceType type) const; |
| |
| // Use with care: returns raw pointer into heap. |
| inline void* DataPtr(); |
| |
| inline int DataSize() const; |
| |
| inline size_t ByteLength() const; |
| |
| private: |
| static inline int ElementSize(InstanceType type); |
| |
| inline int DataSize(InstanceType type) const; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedTypedArrayBase); |
| }; |
| |
| |
| template <class Traits> |
| class FixedTypedArray: public FixedTypedArrayBase { |
| public: |
| typedef typename Traits::ElementType ElementType; |
| static const InstanceType kInstanceType = Traits::kInstanceType; |
| |
| DECL_CAST(FixedTypedArray<Traits>) |
| |
| inline ElementType get_scalar(int index); |
| static inline Handle<Object> get(FixedTypedArray* array, int index); |
| inline void set(int index, ElementType value); |
| |
| static inline ElementType from(int value); |
| static inline ElementType from(uint32_t value); |
| static inline ElementType from(double value); |
| |
| // This accessor applies the correct conversion from Smi, HeapNumber |
| // and undefined. |
| inline void SetValue(uint32_t index, Object* value); |
| |
| DECL_PRINTER(FixedTypedArray) |
| DECL_VERIFIER(FixedTypedArray) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedTypedArray); |
| }; |
| |
| #define FIXED_TYPED_ARRAY_TRAITS(Type, type, TYPE, elementType, size) \ |
| STATIC_ASSERT(size <= FixedTypedArrayBase::kMaxElementSize); \ |
| class Type##ArrayTraits { \ |
| public: /* NOLINT */ \ |
| typedef elementType ElementType; \ |
| static const InstanceType kInstanceType = FIXED_##TYPE##_ARRAY_TYPE; \ |
| static const char* Designator() { return #type " array"; } \ |
| static inline Handle<Object> ToHandle(Isolate* isolate, \ |
| elementType scalar); \ |
| static inline elementType defaultValue(); \ |
| }; \ |
| \ |
| typedef FixedTypedArray<Type##ArrayTraits> Fixed##Type##Array; |
| |
| TYPED_ARRAYS(FIXED_TYPED_ARRAY_TRAITS) |
| |
| #undef FIXED_TYPED_ARRAY_TRAITS |
| |
| // DeoptimizationInputData is a fixed array used to hold the deoptimization |
| // data for optimized code. It also contains information about functions that |
| // were inlined. If N different functions were inlined then first N elements of |
| // the literal array will contain these functions. |
| // |
| // It can be empty. |
| class DeoptimizationInputData: public FixedArray { |
| public: |
| // Layout description. Indices in the array. |
| static const int kTranslationByteArrayIndex = 0; |
| static const int kInlinedFunctionCountIndex = 1; |
| static const int kLiteralArrayIndex = 2; |
| static const int kOsrBytecodeOffsetIndex = 3; |
| static const int kOsrPcOffsetIndex = 4; |
| static const int kOptimizationIdIndex = 5; |
| static const int kSharedFunctionInfoIndex = 6; |
| static const int kWeakCellCacheIndex = 7; |
| static const int kInliningPositionsIndex = 8; |
| static const int kFirstDeoptEntryIndex = 9; |
| |
| // Offsets of deopt entry elements relative to the start of the entry. |
| static const int kBytecodeOffsetRawOffset = 0; |
| static const int kTranslationIndexOffset = 1; |
| static const int kPcOffset = 2; |
| static const int kDeoptEntrySize = 3; |
| |
| // Simple element accessors. |
| #define DECL_ELEMENT_ACCESSORS(name, type) \ |
| inline type* name(); \ |
| inline void Set##name(type* value); |
| |
| DECL_ELEMENT_ACCESSORS(TranslationByteArray, ByteArray) |
| DECL_ELEMENT_ACCESSORS(InlinedFunctionCount, Smi) |
| DECL_ELEMENT_ACCESSORS(LiteralArray, FixedArray) |
| DECL_ELEMENT_ACCESSORS(OsrBytecodeOffset, Smi) |
| DECL_ELEMENT_ACCESSORS(OsrPcOffset, Smi) |
| DECL_ELEMENT_ACCESSORS(OptimizationId, Smi) |
| DECL_ELEMENT_ACCESSORS(SharedFunctionInfo, Object) |
| DECL_ELEMENT_ACCESSORS(WeakCellCache, Object) |
| DECL_ELEMENT_ACCESSORS(InliningPositions, PodArray<InliningPosition>) |
| |
| #undef DECL_ELEMENT_ACCESSORS |
| |
| // Accessors for elements of the ith deoptimization entry. |
| #define DECL_ENTRY_ACCESSORS(name, type) \ |
| inline type* name(int i); \ |
| inline void Set##name(int i, type* value); |
| |
| DECL_ENTRY_ACCESSORS(BytecodeOffsetRaw, Smi) |
| DECL_ENTRY_ACCESSORS(TranslationIndex, Smi) |
| DECL_ENTRY_ACCESSORS(Pc, Smi) |
| |
| #undef DECL_ENTRY_ACCESSORS |
| |
| inline BailoutId BytecodeOffset(int i); |
| |
| inline void SetBytecodeOffset(int i, BailoutId value); |
| |
| inline int DeoptCount(); |
| |
| static const int kNotInlinedIndex = -1; |
| |
| // Returns the inlined function at the given position in LiteralArray, or the |
| // outer function if index == kNotInlinedIndex. |
| class SharedFunctionInfo* GetInlinedFunction(int index); |
| |
| // Allocates a DeoptimizationInputData. |
| static Handle<DeoptimizationInputData> New(Isolate* isolate, |
| int deopt_entry_count, |
| PretenureFlag pretenure); |
| |
| DECL_CAST(DeoptimizationInputData) |
| |
| #ifdef ENABLE_DISASSEMBLER |
| void DeoptimizationInputDataPrint(std::ostream& os); // NOLINT |
| #endif |
| |
| private: |
| static int IndexForEntry(int i) { |
| return kFirstDeoptEntryIndex + (i * kDeoptEntrySize); |
| } |
| |
| |
| static int LengthFor(int entry_count) { return IndexForEntry(entry_count); } |
| }; |
| |
| class TemplateList : public FixedArray { |
| public: |
| static Handle<TemplateList> New(Isolate* isolate, int size); |
| inline int length() const; |
| inline Object* get(int index) const; |
| inline void set(int index, Object* value); |
| static Handle<TemplateList> Add(Isolate* isolate, Handle<TemplateList> list, |
| Handle<Object> value); |
| DECL_CAST(TemplateList) |
| private: |
| static const int kLengthIndex = 0; |
| static const int kFirstElementIndex = kLengthIndex + 1; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(TemplateList); |
| }; |
| |
| // Code describes objects with on-the-fly generated machine code. |
| class Code: public HeapObject { |
| public: |
| // Opaque data type for encapsulating code flags like kind, inline |
| // cache state, and arguments count. |
| typedef uint32_t Flags; |
| |
| #define CODE_KIND_LIST(V) \ |
| V(OPTIMIZED_FUNCTION) \ |
| V(BYTECODE_HANDLER) \ |
| V(STUB) \ |
| V(BUILTIN) \ |
| V(REGEXP) \ |
| V(WASM_FUNCTION) \ |
| V(WASM_TO_JS_FUNCTION) \ |
| V(JS_TO_WASM_FUNCTION) \ |
| V(WASM_INTERPRETER_ENTRY) \ |
| V(C_WASM_ENTRY) |
| |
| enum Kind { |
| #define DEFINE_CODE_KIND_ENUM(name) name, |
| CODE_KIND_LIST(DEFINE_CODE_KIND_ENUM) |
| #undef DEFINE_CODE_KIND_ENUM |
| NUMBER_OF_KINDS |
| }; |
| |
| static const char* Kind2String(Kind kind); |
| |
| #if defined(OBJECT_PRINT) || defined(ENABLE_DISASSEMBLER) |
| // Printing |
| static const char* ICState2String(InlineCacheState state); |
| #endif // defined(OBJECT_PRINT) || defined(ENABLE_DISASSEMBLER) |
| |
| #ifdef ENABLE_DISASSEMBLER |
| void Disassemble(const char* name, std::ostream& os); // NOLINT |
| #endif // ENABLE_DISASSEMBLER |
| |
| // [instruction_size]: Size of the native instructions |
| inline int instruction_size() const; |
| inline void set_instruction_size(int value); |
| |
| // [relocation_info]: Code relocation information |
| DECL_ACCESSORS(relocation_info, ByteArray) |
| void InvalidateRelocation(); |
| void InvalidateEmbeddedObjects(); |
| |
| // [handler_table]: Fixed array containing offsets of exception handlers. |
| DECL_ACCESSORS(handler_table, FixedArray) |
| |
| // [deoptimization_data]: Array containing data for deopt. |
| DECL_ACCESSORS(deoptimization_data, FixedArray) |
| |
| // [source_position_table]: ByteArray for the source positions table or |
| // SourcePositionTableWithFrameCache. |
| DECL_ACCESSORS(source_position_table, Object) |
| |
| inline ByteArray* SourcePositionTable() const; |
| |
| // [trap_handler_index]: An index into the trap handler's master list of code |
| // objects. |
| DECL_ACCESSORS(trap_handler_index, Smi) |
| |
| // [raw_type_feedback_info]: This field stores various things, depending on |
| // the kind of the code object. |
| // STUB and ICs => major/minor key as Smi. |
| // TODO(mvstanton): rename raw_type_feedback_info to stub_key, since the |
| // field is no longer overloaded. |
| DECL_ACCESSORS(raw_type_feedback_info, Object) |
| inline uint32_t stub_key() const; |
| inline void set_stub_key(uint32_t key); |
| |
| // [next_code_link]: Link for lists of optimized or deoptimized code. |
| // Note that storage for this field is overlapped with typefeedback_info. |
| DECL_ACCESSORS(next_code_link, Object) |
| |
| // [constant_pool offset]: Offset of the constant pool. |
| // Valid for FLAG_enable_embedded_constant_pool only |
| inline int constant_pool_offset() const; |
| inline void set_constant_pool_offset(int offset); |
| |
| // Unchecked accessors to be used during GC. |
| inline ByteArray* unchecked_relocation_info() const; |
| |
| inline int relocation_size() const; |
| |
| // [kind]: Access to specific code kind. |
| inline Kind kind() const; |
| inline void set_kind(Kind kind); |
| |
| inline bool is_stub() const; |
| inline bool is_optimized_code() const; |
| inline bool is_wasm_code() const; |
| |
| inline void set_raw_kind_specific_flags1(int value); |
| inline void set_raw_kind_specific_flags2(int value); |
| |
| // Testers for interpreter builtins. |
| inline bool is_interpreter_trampoline_builtin() const; |
| |
| // Tells whether the code checks the optimization marker in the function's |
| // feedback vector. |
| inline bool checks_optimization_marker() const; |
| |
| // [has_tagged_params]: For compiled code or builtins: Tells whether the |
| // outgoing parameters of this code are tagged pointers. True for other kinds. |
| inline bool has_tagged_params() const; |
| inline void set_has_tagged_params(bool value); |
| |
| // [is_turbofanned]: For kind STUB or OPTIMIZED_FUNCTION, tells whether the |
| // code object was generated by the TurboFan optimizing compiler. |
| inline bool is_turbofanned() const; |
| inline void set_is_turbofanned(bool value); |
| |
| // [can_have_weak_objects]: For kind OPTIMIZED_FUNCTION, tells whether the |
| // embedded objects in code should be treated weakly. |
| inline bool can_have_weak_objects() const; |
| inline void set_can_have_weak_objects(bool value); |
| |
| // [is_construct_stub]: For kind BUILTIN, tells whether the code object |
| // represents a hand-written construct stub |
| // (e.g., NumberConstructor_ConstructStub). |
| inline bool is_construct_stub() const; |
| inline void set_is_construct_stub(bool value); |
| |
| // [builtin_index]: For builtins, tells which builtin index the code object |
| // has. The builtin index is a non-negative integer for builtins, and -1 |
| // otherwise. |
| inline int builtin_index() const; |
| inline void set_builtin_index(int id); |
| inline bool is_builtin() const; |
| |
| // [stack_slots]: For kind OPTIMIZED_FUNCTION, the number of stack slots |
| // reserved in the code prologue. |
| inline unsigned stack_slots() const; |
| inline void set_stack_slots(unsigned slots); |
| |
| // [safepoint_table_start]: For kind OPTIMIZED_FUNCTION, the offset in |
| // the instruction stream where the safepoint table starts. |
| inline unsigned safepoint_table_offset() const; |
| inline void set_safepoint_table_offset(unsigned offset); |
| |
| // [marked_for_deoptimization]: For kind OPTIMIZED_FUNCTION tells whether |
| // the code is going to be deoptimized because of dead embedded maps. |
| inline bool marked_for_deoptimization() const; |
| inline void set_marked_for_deoptimization(bool flag); |
| |
| // [deopt_already_counted]: For kind OPTIMIZED_FUNCTION tells whether |
| // the code was already deoptimized. |
| inline bool deopt_already_counted() const; |
| inline void set_deopt_already_counted(bool flag); |
| |
| // [is_promise_rejection]: For kind BUILTIN tells whether the |
| // exception thrown by the code will lead to promise rejection or |
| // uncaught if both this and is_exception_caught is set. |
| // Use GetBuiltinCatchPrediction to access this. |
| inline void set_is_promise_rejection(bool flag); |
| |
| // [is_exception_caught]: For kind BUILTIN tells whether the |
| // exception thrown by the code will be caught internally or |
| // uncaught if both this and is_promise_rejection is set. |
| // Use GetBuiltinCatchPrediction to access this. |
| inline void set_is_exception_caught(bool flag); |
| |
| // [constant_pool]: The constant pool for this function. |
| inline Address constant_pool(); |
| |
| // Get the safepoint entry for the given pc. |
| SafepointEntry GetSafepointEntry(Address pc); |
| |
| // The entire code object including its header is copied verbatim to the |
| // snapshot so that it can be written in one, fast, memcpy during |
| // deserialization. The deserializer will overwrite some pointers, rather |
| // like a runtime linker, but the random allocation addresses used in the |
| // mksnapshot process would still be present in the unlinked snapshot data, |
| // which would make snapshot production non-reproducible. This method wipes |
| // out the to-be-overwritten header data for reproducible snapshots. |
| inline void WipeOutHeader(); |
| |
| // Clear uninitialized padding space. This ensures that the snapshot content |
| // is deterministic. |
| inline void clear_padding(); |
| // Initialize the flags field. Similar to clear_padding above this ensure that |
| // the snapshot content is deterministic. |
| inline void initialize_flags(Kind kind); |
| |
| // Convert a target address into a code object. |
| static inline Code* GetCodeFromTargetAddress(Address address); |
| |
| // Convert an entry address into an object. |
| static inline Object* GetObjectFromEntryAddress(Address location_of_address); |
| |
| // Convert a code entry into an object. |
| static inline Object* GetObjectFromCodeEntry(Address code_entry); |
| |
| // Returns the address of the first instruction. |
| inline byte* instruction_start() const; |
| |
| // Returns the address right after the last instruction. |
| inline byte* instruction_end() const; |
| |
| // Returns the size of the instructions, padding, relocation and unwinding |
| // information. |
| inline int body_size() const; |
| |
| // Returns the size of code and its metadata. This includes the size of code |
| // relocation information, deoptimization data and handler table. |
| inline int SizeIncludingMetadata() const; |
| |
| // Returns the address of the first relocation info (read backwards!). |
| inline byte* relocation_start() const; |
| |
| // [has_unwinding_info]: Whether this code object has unwinding information. |
| // If it doesn't, unwinding_information_start() will point to invalid data. |
| // |
| // The body of all code objects has the following layout. |
| // |
| // +--------------------------+ <-- instruction_start() |
| // | instructions | |
| // | ... | |
| // +--------------------------+ |
| // | relocation info | |
| // | ... | |
| // +--------------------------+ <-- instruction_end() |
| // |
| // If has_unwinding_info() is false, instruction_end() points to the first |
| // memory location after the end of the code object. Otherwise, the body |
| // continues as follows: |
| // |
| // +--------------------------+ |
| // | padding to the next | |
| // | 8-byte aligned address | |
| // +--------------------------+ <-- instruction_end() |
| // | [unwinding_info_size] | |
| // | as uint64_t | |
| // +--------------------------+ <-- unwinding_info_start() |
| // | unwinding info | |
| // | ... | |
| // +--------------------------+ <-- unwinding_info_end() |
| // |
| // and unwinding_info_end() points to the first memory location after the end |
| // of the code object. |
| // |
| DECL_BOOLEAN_ACCESSORS(has_unwinding_info) |
| |
| // [unwinding_info_size]: Size of the unwinding information. |
| inline int unwinding_info_size() const; |
| inline void set_unwinding_info_size(int value); |
| |
| // Returns the address of the unwinding information, if any. |
| inline byte* unwinding_info_start() const; |
| |
| // Returns the address right after the end of the unwinding information. |
| inline byte* unwinding_info_end() const; |
| |
| // Code entry point. |
| inline byte* entry() const; |
| |
| // Returns true if pc is inside this object's instructions. |
| inline bool contains(byte* pc); |
| |
| // Relocate the code by delta bytes. Called to signal that this code |
| // object has been moved by delta bytes. |
| void Relocate(intptr_t delta); |
| |
| // Migrate code described by desc. |
| void CopyFrom(const CodeDesc& desc); |
| |
| // Returns the object size for a given body (used for allocation). |
| static int SizeFor(int body_size) { |
| DCHECK_SIZE_TAG_ALIGNED(body_size); |
| return RoundUp(kHeaderSize + body_size, kCodeAlignment); |
| } |
| |
| // Calculate the size of the code object to report for log events. This takes |
| // the layout of the code object into account. |
| inline int ExecutableSize() const; |
| |
| DECL_CAST(Code) |
| |
| // Dispatched behavior. |
| inline int CodeSize() const; |
| |
| DECL_PRINTER(Code) |
| DECL_VERIFIER(Code) |
| |
| void PrintDeoptLocation(FILE* out, Address pc); |
| bool CanDeoptAt(Address pc); |
| |
| inline HandlerTable::CatchPrediction GetBuiltinCatchPrediction(); |
| #ifdef VERIFY_HEAP |
| void VerifyEmbeddedObjectsDependency(); |
| #endif |
| |
| #ifdef DEBUG |
| enum VerifyMode { kNoContextSpecificPointers, kNoContextRetainingPointers }; |
| void VerifyEmbeddedObjects(VerifyMode mode = kNoContextRetainingPointers); |
| #endif // DEBUG |
| |
| inline bool CanContainWeakObjects(); |
| |
| inline bool IsWeakObject(Object* object); |
| |
| static inline bool IsWeakObjectInOptimizedCode(Object* object); |
| |
| static Handle<WeakCell> WeakCellFor(Handle<Code> code); |
| WeakCell* CachedWeakCell(); |
| |
| // Return true if the function is inlined in the code. |
| bool Inlines(SharedFunctionInfo* sfi); |
| |
| class OptimizedCodeIterator { |
| public: |
| explicit OptimizedCodeIterator(Isolate* isolate); |
| Code* Next(); |
| |
| private: |
| Context* next_context_; |
| Code* current_code_; |
| Isolate* isolate_; |
| |
| DisallowHeapAllocation no_gc; |
| DISALLOW_COPY_AND_ASSIGN(OptimizedCodeIterator) |
| }; |
| |
| static const int kConstantPoolSize = |
| FLAG_enable_embedded_constant_pool ? kIntSize : 0; |
| |
| // Layout description. |
| static const int kRelocationInfoOffset = HeapObject::kHeaderSize; |
| static const int kHandlerTableOffset = kRelocationInfoOffset + kPointerSize; |
| static const int kDeoptimizationDataOffset = |
| kHandlerTableOffset + kPointerSize; |
| static const int kSourcePositionTableOffset = |
| kDeoptimizationDataOffset + kPointerSize; |
| // For FUNCTION kind, we store the type feedback info here. |
| static const int kTypeFeedbackInfoOffset = |
| kSourcePositionTableOffset + kPointerSize; |
| static const int kNextCodeLinkOffset = kTypeFeedbackInfoOffset + kPointerSize; |
| static const int kInstructionSizeOffset = kNextCodeLinkOffset + kPointerSize; |
| static const int kFlagsOffset = kInstructionSizeOffset + kIntSize; |
| static const int kKindSpecificFlags1Offset = kFlagsOffset + kIntSize; |
| static const int kKindSpecificFlags2Offset = |
| kKindSpecificFlags1Offset + kIntSize; |
| static const int kConstantPoolOffset = kKindSpecificFlags2Offset + kIntSize; |
| static const int kBuiltinIndexOffset = |
| kConstantPoolOffset + kConstantPoolSize; |
| static const int kTrapHandlerIndex = kBuiltinIndexOffset + kIntSize; |
| static const int kHeaderPaddingStart = kTrapHandlerIndex + kPointerSize; |
| |
| // Add padding to align the instruction start following right after |
| // the Code object header. |
| static const int kHeaderSize = |
| (kHeaderPaddingStart + kCodeAlignmentMask) & ~kCodeAlignmentMask; |
| |
| // Data or code not directly visited by GC directly starts here. |
| // The serializer needs to copy bytes starting from here verbatim. |
| // Objects embedded into code is visited via reloc info. |
| static const int kDataStart = kInstructionSizeOffset; |
| |
| inline int GetUnwindingInfoSizeOffset() const; |
| |
| class BodyDescriptor; |
| |
| // Flags layout. BitField<type, shift, size>. |
| class HasUnwindingInfoField : public BitField<bool, 0, 1> {}; |
| class KindField : public BitField<Kind, HasUnwindingInfoField::kNext, 5> {}; |
| STATIC_ASSERT(NUMBER_OF_KINDS <= KindField::kMax); |
| |
| // KindSpecificFlags1 layout (STUB, BUILTIN and OPTIMIZED_FUNCTION) |
| static const int kStackSlotsFirstBit = 0; |
| static const int kStackSlotsBitCount = 24; |
| static const int kMarkedForDeoptimizationBit = |
| kStackSlotsFirstBit + kStackSlotsBitCount; |
| static const int kDeoptAlreadyCountedBit = kMarkedForDeoptimizationBit + 1; |
| static const int kIsTurbofannedBit = kDeoptAlreadyCountedBit + 1; |
| static const int kCanHaveWeakObjects = kIsTurbofannedBit + 1; |
| // Could be moved to overlap previous bits when we need more space. |
| static const int kIsConstructStub = kCanHaveWeakObjects + 1; |
| static const int kIsPromiseRejection = kIsConstructStub + 1; |
| static const int kIsExceptionCaught = kIsPromiseRejection + 1; |
| |
| STATIC_ASSERT(kStackSlotsFirstBit + kStackSlotsBitCount <= 32); |
| STATIC_ASSERT(kIsExceptionCaught + 1 <= 32); |
| |
| class StackSlotsField: public BitField<int, |
| kStackSlotsFirstBit, kStackSlotsBitCount> {}; // NOLINT |
| class MarkedForDeoptimizationField |
| : public BitField<bool, kMarkedForDeoptimizationBit, 1> {}; // NOLINT |
| class DeoptAlreadyCountedField |
| : public BitField<bool, kDeoptAlreadyCountedBit, 1> {}; // NOLINT |
| class IsTurbofannedField : public BitField<bool, kIsTurbofannedBit, 1> { |
| }; // NOLINT |
| class CanHaveWeakObjectsField |
| : public BitField<bool, kCanHaveWeakObjects, 1> {}; // NOLINT |
| class IsConstructStubField : public BitField<bool, kIsConstructStub, 1> { |
| }; // NOLINT |
| class IsPromiseRejectionField |
| : public BitField<bool, kIsPromiseRejection, 1> {}; // NOLINT |
| class IsExceptionCaughtField : public BitField<bool, kIsExceptionCaught, 1> { |
| }; // NOLINT |
| |
| // KindSpecificFlags2 layout (ALL) |
| static const int kHasTaggedStackBit = 0; |
| class HasTaggedStackField : public BitField<bool, kHasTaggedStackBit, 1> {}; |
| |
| // KindSpecificFlags2 layout (STUB and OPTIMIZED_FUNCTION) |
| static const int kSafepointTableOffsetFirstBit = kHasTaggedStackBit + 1; |
| static const int kSafepointTableOffsetBitCount = 30; |
| |
| STATIC_ASSERT(kSafepointTableOffsetFirstBit + |
| kSafepointTableOffsetBitCount <= 32); |
| STATIC_ASSERT(1 + kSafepointTableOffsetBitCount <= 32); |
| |
| class SafepointTableOffsetField: public BitField<int, |
| kSafepointTableOffsetFirstBit, |
| kSafepointTableOffsetBitCount> {}; // NOLINT |
| |
| static const int kArgumentsBits = 16; |
| static const int kMaxArguments = (1 << kArgumentsBits) - 1; |
| |
| private: |
| friend class RelocIterator; |
| |
| bool is_promise_rejection() const; |
| bool is_exception_caught() const; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Code); |
| }; |
| |
| class AbstractCode : public HeapObject { |
| public: |
| // All code kinds and INTERPRETED_FUNCTION. |
| enum Kind { |
| #define DEFINE_CODE_KIND_ENUM(name) name, |
| CODE_KIND_LIST(DEFINE_CODE_KIND_ENUM) |
| #undef DEFINE_CODE_KIND_ENUM |
| INTERPRETED_FUNCTION, |
| NUMBER_OF_KINDS |
| }; |
| |
| static const char* Kind2String(Kind kind); |
| |
| int SourcePosition(int offset); |
| int SourceStatementPosition(int offset); |
| |
| // Returns the address of the first instruction. |
| inline Address instruction_start(); |
| |
| // Returns the address right after the last instruction. |
| inline Address instruction_end(); |
| |
| // Returns the size of the code instructions. |
| inline int instruction_size(); |
| |
| // Return the source position table. |
| inline ByteArray* source_position_table(); |
| |
| // Set the source position table. |
| inline void set_source_position_table(ByteArray* source_position_table); |
| |
| inline Object* stack_frame_cache(); |
| static void SetStackFrameCache(Handle<AbstractCode> abstract_code, |
| Handle<UnseededNumberDictionary> cache); |
| void DropStackFrameCache(); |
| |
| // Returns the size of instructions and the metadata. |
| inline int SizeIncludingMetadata(); |
| |
| // Returns true if pc is inside this object's instructions. |
| inline bool contains(byte* pc); |
| |
| // Returns the AbstractCode::Kind of the code. |
| inline Kind kind(); |
| |
| // Calculate the size of the code object to report for log events. This takes |
| // the layout of the code object into account. |
| inline int ExecutableSize(); |
| |
| DECL_CAST(AbstractCode) |
| inline Code* GetCode(); |
| inline BytecodeArray* GetBytecodeArray(); |
| |
| // Max loop nesting marker used to postpose OSR. We don't take loop |
| // nesting that is deeper than 5 levels into account. |
| static const int kMaxLoopNestingMarker = 6; |
| }; |
| |
| // Dependent code is a singly linked list of fixed arrays. Each array contains |
| // code objects in weak cells for one dependent group. The suffix of the array |
| // can be filled with the undefined value if the number of codes is less than |
| // the length of the array. |
| // |
| // +------+-----------------+--------+--------+-----+--------+-----------+-----+ |
| // | next | count & group 1 | code 1 | code 2 | ... | code n | undefined | ... | |
| // +------+-----------------+--------+--------+-----+--------+-----------+-----+ |
| // | |
| // V |
| // +------+-----------------+--------+--------+-----+--------+-----------+-----+ |
| // | next | count & group 2 | code 1 | code 2 | ... | code m | undefined | ... | |
| // +------+-----------------+--------+--------+-----+--------+-----------+-----+ |
| // | |
| // V |
| // empty_fixed_array() |
| // |
| // The list of fixed arrays is ordered by dependency groups. |
| |
| class DependentCode: public FixedArray { |
| public: |
| enum DependencyGroup { |
| // Group of code that weakly embed this map and depend on being |
| // deoptimized when the map is garbage collected. |
| kWeakCodeGroup, |
| // Group of code that embed a transition to this map, and depend on being |
| // deoptimized when the transition is replaced by a new version. |
| kTransitionGroup, |
| // Group of code that omit run-time prototype checks for prototypes |
| // described by this map. The group is deoptimized whenever an object |
| // described by this map changes shape (and transitions to a new map), |
| // possibly invalidating the assumptions embedded in the code. |
| kPrototypeCheckGroup, |
| // Group of code that depends on global property values in property cells |
| // not being changed. |
| kPropertyCellChangedGroup, |
| // Group of code that omit run-time checks for field(s) introduced by |
| // this map, i.e. for the field type. |
| kFieldOwnerGroup, |
| // Group of code that omit run-time type checks for initial maps of |
| // constructors. |
| kInitialMapChangedGroup, |
| // Group of code that depends on tenuring information in AllocationSites |
| // not being changed. |
| kAllocationSiteTenuringChangedGroup, |
| // Group of code that depends on element transition information in |
| // AllocationSites not being changed. |
| kAllocationSiteTransitionChangedGroup |
| }; |
| |
| static const int kGroupCount = kAllocationSiteTransitionChangedGroup + 1; |
| static const int kNextLinkIndex = 0; |
| static const int kFlagsIndex = 1; |
| static const int kCodesStartIndex = 2; |
| |
| bool Contains(DependencyGroup group, WeakCell* code_cell); |
| bool IsEmpty(DependencyGroup group); |
| |
| static Handle<DependentCode> InsertCompilationDependencies( |
| Handle<DependentCode> entries, DependencyGroup group, |
| Handle<Foreign> info); |
| |
| static Handle<DependentCode> InsertWeakCode(Handle<DependentCode> entries, |
| DependencyGroup group, |
| Handle<WeakCell> code_cell); |
| |
| void UpdateToFinishedCode(DependencyGroup group, Foreign* info, |
| WeakCell* code_cell); |
| |
| void RemoveCompilationDependencies(DependentCode::DependencyGroup group, |
| Foreign* info); |
| |
| void DeoptimizeDependentCodeGroup(Isolate* isolate, |
| DependentCode::DependencyGroup group); |
| |
| bool MarkCodeForDeoptimization(Isolate* isolate, |
| DependentCode::DependencyGroup group); |
| |
| // The following low-level accessors should only be used by this class |
| // and the mark compact collector. |
| inline DependentCode* next_link(); |
| inline void set_next_link(DependentCode* next); |
| inline int count(); |
| inline void set_count(int value); |
| inline DependencyGroup group(); |
| inline void set_group(DependencyGroup group); |
| inline Object* object_at(int i); |
| inline void set_object_at(int i, Object* object); |
| inline void clear_at(int i); |
| inline void copy(int from, int to); |
| DECL_CAST(DependentCode) |
| |
| static const char* DependencyGroupName(DependencyGroup group); |
| static void SetMarkedForDeoptimization(Code* code, DependencyGroup group); |
| |
| private: |
| static Handle<DependentCode> Insert(Handle<DependentCode> entries, |
| DependencyGroup group, |
| Handle<Object> object); |
| static Handle<DependentCode> New(DependencyGroup group, Handle<Object> object, |
| Handle<DependentCode> next); |
| static Handle<DependentCode> EnsureSpace(Handle<DependentCode> entries); |
| // Compact by removing cleared weak cells and return true if there was |
| // any cleared weak cell. |
| bool Compact(); |
| static int Grow(int number_of_entries) { |
| if (number_of_entries < 5) return number_of_entries + 1; |
| return number_of_entries * 5 / 4; |
| } |
| inline int flags(); |
| inline void set_flags(int flags); |
| class GroupField : public BitField<int, 0, 3> {}; |
| class CountField : public BitField<int, 3, 27> {}; |
| STATIC_ASSERT(kGroupCount <= GroupField::kMax + 1); |
| }; |
| |
| class PrototypeInfo; |
| |
| // An abstract superclass, a marker class really, for simple structure classes. |
| // It doesn't carry much functionality but allows struct classes to be |
| // identified in the type system. |
| class Struct: public HeapObject { |
| public: |
| inline void InitializeBody(int object_size); |
| DECL_CAST(Struct) |
| void BriefPrintDetails(std::ostream& os); |
| }; |
| |
| class PromiseCapability : public Struct { |
| public: |
| DECL_CAST(PromiseCapability) |
| DECL_PRINTER(PromiseCapability) |
| DECL_VERIFIER(PromiseCapability) |
| |
| DECL_ACCESSORS(promise, Object) |
| DECL_ACCESSORS(resolve, Object) |
| DECL_ACCESSORS(reject, Object) |
| |
| static const int kPromiseOffset = Struct::kHeaderSize; |
| static const int kResolveOffset = kPromiseOffset + kPointerSize; |
| static const int kRejectOffset = kResolveOffset + kPointerSize; |
| static const int kSize = kRejectOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PromiseCapability); |
| }; |
| |
| // A container struct to hold state required for PromiseResolveThenableJob. |
| class PromiseResolveThenableJobInfo : public Struct { |
| public: |
| DECL_ACCESSORS(thenable, JSReceiver) |
| DECL_ACCESSORS(then, JSReceiver) |
| DECL_ACCESSORS(resolve, JSFunction) |
| DECL_ACCESSORS(reject, JSFunction) |
| |
| DECL_ACCESSORS(context, Context) |
| |
| static const int kThenableOffset = Struct::kHeaderSize; |
| static const int kThenOffset = kThenableOffset + kPointerSize; |
| static const int kResolveOffset = kThenOffset + kPointerSize; |
| static const int kRejectOffset = kResolveOffset + kPointerSize; |
| static const int kContextOffset = kRejectOffset + kPointerSize; |
| static const int kSize = kContextOffset + kPointerSize; |
| |
| DECL_CAST(PromiseResolveThenableJobInfo) |
| DECL_PRINTER(PromiseResolveThenableJobInfo) |
| DECL_VERIFIER(PromiseResolveThenableJobInfo) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PromiseResolveThenableJobInfo); |
| }; |
| |
| class JSPromise; |
| |
| // Struct to hold state required for PromiseReactionJob. |
| class PromiseReactionJobInfo : public Struct { |
| public: |
| DECL_ACCESSORS(value, Object) |
| DECL_ACCESSORS(tasks, Object) |
| |
| // Check comment in JSPromise for information on what state these |
| // deferred fields could be in. |
| DECL_ACCESSORS(deferred_promise, Object) |
| DECL_ACCESSORS(deferred_on_resolve, Object) |
| DECL_ACCESSORS(deferred_on_reject, Object) |
| |
| DECL_INT_ACCESSORS(debug_id) |
| |
| DECL_ACCESSORS(context, Context) |
| |
| static const int kValueOffset = Struct::kHeaderSize; |
| static const int kTasksOffset = kValueOffset + kPointerSize; |
| static const int kDeferredPromiseOffset = kTasksOffset + kPointerSize; |
| static const int kDeferredOnResolveOffset = |
| kDeferredPromiseOffset + kPointerSize; |
| static const int kDeferredOnRejectOffset = |
| kDeferredOnResolveOffset + kPointerSize; |
| static const int kContextOffset = kDeferredOnRejectOffset + kPointerSize; |
| static const int kSize = kContextOffset + kPointerSize; |
| |
| DECL_CAST(PromiseReactionJobInfo) |
| DECL_PRINTER(PromiseReactionJobInfo) |
| DECL_VERIFIER(PromiseReactionJobInfo) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PromiseReactionJobInfo); |
| }; |
| |
| class AsyncGeneratorRequest : public Struct { |
| public: |
| // Holds an AsyncGeneratorRequest, or Undefined. |
| DECL_ACCESSORS(next, Object) |
| DECL_INT_ACCESSORS(resume_mode) |
| DECL_ACCESSORS(value, Object) |
| DECL_ACCESSORS(promise, Object) |
| |
| static const int kNextOffset = Struct::kHeaderSize; |
| static const int kResumeModeOffset = kNextOffset + kPointerSize; |
| static const int kValueOffset = kResumeModeOffset + kPointerSize; |
| static const int kPromiseOffset = kValueOffset + kPointerSize; |
| static const int kSize = kPromiseOffset + kPointerSize; |
| |
| DECL_CAST(AsyncGeneratorRequest) |
| DECL_PRINTER(AsyncGeneratorRequest) |
| DECL_VERIFIER(AsyncGeneratorRequest) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AsyncGeneratorRequest); |
| }; |
| |
| // Container for metadata stored on each prototype map. |
| class PrototypeInfo : public Struct { |
| public: |
| static const int UNREGISTERED = -1; |
| |
| // [weak_cell]: A WeakCell containing this prototype. ICs cache the cell here. |
| DECL_ACCESSORS(weak_cell, Object) |
| |
| // [prototype_users]: WeakFixedArray containing maps using this prototype, |
| // or Smi(0) if uninitialized. |
| DECL_ACCESSORS(prototype_users, Object) |
| |
| // [object_create_map]: A field caching the map for Object.create(prototype). |
| static inline void SetObjectCreateMap(Handle<PrototypeInfo> info, |
| Handle<Map> map); |
| inline Map* ObjectCreateMap(); |
| inline bool HasObjectCreateMap(); |
| |
| // [registry_slot]: Slot in prototype's user registry where this user |
| // is stored. Returns UNREGISTERED if this prototype has not been registered. |
| inline int registry_slot() const; |
| inline void set_registry_slot(int slot); |
| // [validity_cell]: Cell containing the validity bit for prototype chains |
| // going through this object, or Smi(0) if uninitialized. |
| // When a prototype object changes its map, then both its own validity cell |
| // and those of all "downstream" prototypes are invalidated; handlers for a |
| // given receiver embed the currently valid cell for that receiver's prototype |
| // during their compilation and check it on execution. |
| DECL_ACCESSORS(validity_cell, Object) |
| // [bit_field] |
| inline int bit_field() const; |
| inline void set_bit_field(int bit_field); |
| |
| DECL_BOOLEAN_ACCESSORS(should_be_fast_map) |
| |
| DECL_CAST(PrototypeInfo) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(PrototypeInfo) |
| DECL_VERIFIER(PrototypeInfo) |
| |
| static const int kWeakCellOffset = HeapObject::kHeaderSize; |
| static const int kPrototypeUsersOffset = kWeakCellOffset + kPointerSize; |
| static const int kRegistrySlotOffset = kPrototypeUsersOffset + kPointerSize; |
| static const int kValidityCellOffset = kRegistrySlotOffset + kPointerSize; |
| static const int kObjectCreateMap = kValidityCellOffset + kPointerSize; |
| static const int kBitFieldOffset = kObjectCreateMap + kPointerSize; |
| static const int kSize = kBitFieldOffset + kPointerSize; |
| |
| // Bit field usage. |
| static const int kShouldBeFastBit = 0; |
| |
| private: |
| DECL_ACCESSORS(object_create_map, Object) |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PrototypeInfo); |
| }; |
| |
| class Tuple2 : public Struct { |
| public: |
| DECL_ACCESSORS(value1, Object) |
| DECL_ACCESSORS(value2, Object) |
| |
| DECL_CAST(Tuple2) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(Tuple2) |
| DECL_VERIFIER(Tuple2) |
| void BriefPrintDetails(std::ostream& os); |
| |
| static const int kValue1Offset = HeapObject::kHeaderSize; |
| static const int kValue2Offset = kValue1Offset + kPointerSize; |
| static const int kSize = kValue2Offset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Tuple2); |
| }; |
| |
| class Tuple3 : public Tuple2 { |
| public: |
| DECL_ACCESSORS(value3, Object) |
| |
| DECL_CAST(Tuple3) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(Tuple3) |
| DECL_VERIFIER(Tuple3) |
| void BriefPrintDetails(std::ostream& os); |
| |
| static const int kValue3Offset = Tuple2::kSize; |
| static const int kSize = kValue3Offset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Tuple3); |
| }; |
| |
| // Pair used to store both a ScopeInfo and an extension object in the extension |
| // slot of a block, catch, or with context. Needed in the rare case where a |
| // declaration block scope (a "varblock" as used to desugar parameter |
| // destructuring) also contains a sloppy direct eval, or for with and catch |
| // scopes. (In no other case both are needed at the same time.) |
| class ContextExtension : public Struct { |
| public: |
| // [scope_info]: Scope info. |
| DECL_ACCESSORS(scope_info, ScopeInfo) |
| // [extension]: Extension object. |
| DECL_ACCESSORS(extension, Object) |
| |
| DECL_CAST(ContextExtension) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(ContextExtension) |
| DECL_VERIFIER(ContextExtension) |
| |
| static const int kScopeInfoOffset = HeapObject::kHeaderSize; |
| static const int kExtensionOffset = kScopeInfoOffset + kPointerSize; |
| static const int kSize = kExtensionOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ContextExtension); |
| }; |
| |
| // List of builtin functions we want to identify to improve code |
| // generation. |
| // |
| // Each entry has a name of a global object property holding an object |
| // optionally followed by ".prototype", a name of a builtin function |
| // on the object (the one the id is set for), and a label. |
| // |
| // Installation of ids for the selected builtin functions is handled |
| // by the bootstrapper. |
| #define FUNCTIONS_WITH_ID_LIST(V) \ |
| V(Array, isArray, ArrayIsArray) \ |
| V(Array.prototype, concat, ArrayConcat) \ |
| V(Array.prototype, every, ArrayEvery) \ |
| V(Array.prototype, fill, ArrayFill) \ |
| V(Array.prototype, filter, ArrayFilter) \ |
| V(Array.prototype, findIndex, ArrayFindIndex) \ |
| V(Array.prototype, forEach, ArrayForEach) \ |
| V(Array.prototype, includes, ArrayIncludes) \ |
| V(Array.prototype, indexOf, ArrayIndexOf) \ |
| V(Array.prototype, join, ArrayJoin) \ |
| V(Array.prototype, lastIndexOf, ArrayLastIndexOf) \ |
| V(Array.prototype, map, ArrayMap) \ |
| V(Array.prototype, pop, ArrayPop) \ |
| V(Array.prototype, push, ArrayPush) \ |
| V(Array.prototype, reverse, ArrayReverse) \ |
| V(Array.prototype, shift, ArrayShift) \ |
| V(Array.prototype, slice, ArraySlice) \ |
| V(Array.prototype, some, ArraySome) \ |
| V(Array.prototype, splice, ArraySplice) \ |
| V(Array.prototype, unshift, ArrayUnshift) \ |
| V(Date, now, DateNow) \ |
| V(Date.prototype, getDate, DateGetDate) \ |
| V(Date.prototype, getDay, DateGetDay) \ |
| V(Date.prototype, getFullYear, DateGetFullYear) \ |
| V(Date.prototype, getHours, DateGetHours) \ |
| V(Date.prototype, getMilliseconds, DateGetMilliseconds) \ |
| V(Date.prototype, getMinutes, DateGetMinutes) \ |
| V(Date.prototype, getMonth, DateGetMonth) \ |
| V(Date.prototype, getSeconds, DateGetSeconds) \ |
| V(Date.prototype, getTime, DateGetTime) \ |
| V(Function.prototype, apply, FunctionApply) \ |
| V(Function.prototype, bind, FunctionBind) \ |
| V(Function.prototype, call, FunctionCall) \ |
| V(Object, assign, ObjectAssign) \ |
| V(Object, create, ObjectCreate) \ |
| V(Object.prototype, hasOwnProperty, ObjectHasOwnProperty) \ |
| V(Object.prototype, isPrototypeOf, ObjectIsPrototypeOf) \ |
| V(Object.prototype, toString, ObjectToString) \ |
| V(RegExp.prototype, compile, RegExpCompile) \ |
| V(RegExp.prototype, exec, RegExpExec) \ |
| V(RegExp.prototype, test, RegExpTest) \ |
| V(RegExp.prototype, toString, RegExpToString) \ |
| V(String.prototype, charCodeAt, StringCharCodeAt) \ |
| V(String.prototype, charAt, StringCharAt) \ |
| V(String.prototype, codePointAt, StringCodePointAt) \ |
| V(String.prototype, concat, StringConcat) \ |
| V(String.prototype, endsWith, StringEndsWith) \ |
| V(String.prototype, includes, StringIncludes) \ |
| V(String.prototype, indexOf, StringIndexOf) \ |
| V(String.prototype, lastIndexOf, StringLastIndexOf) \ |
| V(String.prototype, repeat, StringRepeat) \ |
| V(String.prototype, slice, StringSlice) \ |
| V(String.prototype, startsWith, StringStartsWith) \ |
| V(String.prototype, substr, StringSubstr) \ |
| V(String.prototype, substring, StringSubstring) \ |
| V(String.prototype, toLowerCase, StringToLowerCase) \ |
| V(String.prototype, toString, StringToString) \ |
| V(String.prototype, toUpperCase, StringToUpperCase) \ |
| V(String.prototype, trim, StringTrim) \ |
| V(String.prototype, trimLeft, StringTrimLeft) \ |
| V(String.prototype, trimRight, StringTrimRight) \ |
| V(String.prototype, valueOf, StringValueOf) \ |
| V(String, fromCharCode, StringFromCharCode) \ |
| V(String, fromCodePoint, StringFromCodePoint) \ |
| V(String, raw, StringRaw) \ |
| V(Math, random, MathRandom) \ |
| V(Math, floor, MathFloor) \ |
| V(Math, round, MathRound) \ |
| V(Math, ceil, MathCeil) \ |
| V(Math, abs, MathAbs) \ |
| V(Math, log, MathLog) \ |
| V(Math, log1p, MathLog1p) \ |
| V(Math, log2, MathLog2) \ |
| V(Math, log10, MathLog10) \ |
| V(Math, cbrt, MathCbrt) \ |
| V(Math, exp, MathExp) \ |
| V(Math, expm1, MathExpm1) \ |
| V(Math, sqrt, MathSqrt) \ |
| V(Math, pow, MathPow) \ |
| V(Math, max, MathMax) \ |
| V(Math, min, MathMin) \ |
| V(Math, cos, MathCos) \ |
| V(Math, cosh, MathCosh) \ |
| V(Math, sign, MathSign) \ |
| V(Math, sin, MathSin) \ |
| V(Math, sinh, MathSinh) \ |
| V(Math, tan, MathTan) \ |
| V(Math, tanh, MathTanh) \ |
| V(Math, acos, MathAcos) \ |
| V(Math, acosh, MathAcosh) \ |
| V(Math, asin, MathAsin) \ |
| V(Math, asinh, MathAsinh) \ |
| V(Math, atan, MathAtan) \ |
| V(Math, atan2, MathAtan2) \ |
| V(Math, atanh, MathAtanh) \ |
| V(Math, imul, MathImul) \ |
| V(Math, clz32, MathClz32) \ |
| V(Math, fround, MathFround) \ |
| V(Math, trunc, MathTrunc) \ |
| V(Number, isFinite, NumberIsFinite) \ |
| V(Number, isInteger, NumberIsInteger) \ |
| V(Number, isNaN, NumberIsNaN) \ |
| V(Number, isSafeInteger, NumberIsSafeInteger) \ |
| V(Number, parseFloat, NumberParseFloat) \ |
| V(Number, parseInt, NumberParseInt) \ |
| V(Number.prototype, toString, NumberToString) \ |
| V(Map.prototype, clear, MapClear) \ |
| V(Map.prototype, delete, MapDelete) \ |
| V(Map.prototype, entries, MapEntries) \ |
| V(Map.prototype, forEach, MapForEach) \ |
| V(Map.prototype, has, MapHas) \ |
| V(Map.prototype, keys, MapKeys) \ |
| V(Map.prototype, get, MapGet) \ |
| V(Map.prototype, set, MapSet) \ |
| V(Map.prototype, values, MapValues) \ |
| V(Set.prototype, add, SetAdd) \ |
| V(Set.prototype, clear, SetClear) \ |
| V(Set.prototype, delete, SetDelete) \ |
| V(Set.prototype, entries, SetEntries) \ |
| V(Set.prototype, forEach, SetForEach) \ |
| V(Set.prototype, has, SetHas) \ |
| V(Set.prototype, values, SetValues) \ |
| V(WeakMap.prototype, delete, WeakMapDelete) \ |
| V(WeakMap.prototype, has, WeakMapHas) \ |
| V(WeakMap.prototype, set, WeakMapSet) \ |
| V(WeakSet.prototype, add, WeakSetAdd) \ |
| V(WeakSet.prototype, delete, WeakSetDelete) \ |
| V(WeakSet.prototype, has, WeakSetHas) |
| |
| #define ATOMIC_FUNCTIONS_WITH_ID_LIST(V) \ |
| V(Atomics, load, AtomicsLoad) \ |
| V(Atomics, store, AtomicsStore) \ |
| V(Atomics, exchange, AtomicsExchange) \ |
| V(Atomics, compareExchange, AtomicsCompareExchange) \ |
| V(Atomics, add, AtomicsAdd) \ |
| V(Atomics, sub, AtomicsSub) \ |
| V(Atomics, and, AtomicsAnd) \ |
| V(Atomics, or, AtomicsOr) \ |
| V(Atomics, xor, AtomicsXor) |
| |
| enum BuiltinFunctionId { |
| kInvalidBuiltinFunctionId = -1, |
| kArrayConstructor, |
| #define DECL_FUNCTION_ID(ignored1, ignore2, name) k##name, |
| FUNCTIONS_WITH_ID_LIST(DECL_FUNCTION_ID) |
| ATOMIC_FUNCTIONS_WITH_ID_LIST(DECL_FUNCTION_ID) |
| #undef DECL_FUNCTION_ID |
| // Fake id for a special case of Math.pow. Note, it continues the |
| // list of math functions. |
| kMathPowHalf, |
| // These are manually assigned to special getters during bootstrapping. |
| kArrayBufferByteLength, |
| kArrayBufferIsView, |
| kArrayEntries, |
| kArrayKeys, |
| kArrayValues, |
| kArrayIteratorNext, |
| kMapSize, |
| kSetSize, |
| kMapIteratorNext, |
| kSetIteratorNext, |
| kDataViewBuffer, |
| kDataViewByteLength, |
| kDataViewByteOffset, |
| kFunctionHasInstance, |
| kGlobalDecodeURI, |
| kGlobalDecodeURIComponent, |
| kGlobalEncodeURI, |
| kGlobalEncodeURIComponent, |
| kGlobalEscape, |
| kGlobalUnescape, |
| kGlobalIsFinite, |
| kGlobalIsNaN, |
| kTypedArrayByteLength, |
| kTypedArrayByteOffset, |
| kTypedArrayEntries, |
| kTypedArrayKeys, |
| kTypedArrayLength, |
| kTypedArrayToStringTag, |
| kTypedArrayValues, |
| kSharedArrayBufferByteLength, |
| kStringIterator, |
| kStringIteratorNext, |
| kStringToLowerCaseIntl, |
| kStringToUpperCaseIntl |
| }; |
| |
| class JSGeneratorObject: public JSObject { |
| public: |
| // [function]: The function corresponding to this generator object. |
| DECL_ACCESSORS(function, JSFunction) |
| |
| // [context]: The context of the suspended computation. |
| DECL_ACCESSORS(context, Context) |
| |
| // [receiver]: The receiver of the suspended computation. |
| DECL_ACCESSORS(receiver, Object) |
| |
| // [input_or_debug_pos] |
| // For executing generators: the most recent input value. |
| // For suspended generators: debug information (bytecode offset). |
| // There is currently no need to remember the most recent input value for a |
| // suspended generator. |
| DECL_ACCESSORS(input_or_debug_pos, Object) |
| |
| // [resume_mode]: The most recent resume mode. |
| enum ResumeMode { kNext, kReturn, kThrow }; |
| DECL_INT_ACCESSORS(resume_mode) |
| |
| // [continuation] |
| // |
| // A positive value indicates a suspended generator. The special |
| // kGeneratorExecuting and kGeneratorClosed values indicate that a generator |
| // cannot be resumed. |
| inline int continuation() const; |
| inline void set_continuation(int continuation); |
| inline bool is_closed() const; |
| inline bool is_executing() const; |
| inline bool is_suspended() const; |
| |
| // For suspended generators: the source position at which the generator |
| // is suspended. |
| int source_position() const; |
| |
| // [register_file]: Saved interpreter register file. |
| DECL_ACCESSORS(register_file, FixedArray) |
| |
| DECL_CAST(JSGeneratorObject) |
| |
| // Dispatched behavior. |
| DECL_VERIFIER(JSGeneratorObject) |
| |
| // Magic sentinel values for the continuation. |
| static const int kGeneratorExecuting = -2; |
| static const int kGeneratorClosed = -1; |
| |
| // Layout description. |
| static const int kFunctionOffset = JSObject::kHeaderSize; |
| static const int kContextOffset = kFunctionOffset + kPointerSize; |
| static const int kReceiverOffset = kContextOffset + kPointerSize; |
| static const int kInputOrDebugPosOffset = kReceiverOffset + kPointerSize; |
| static const int kResumeModeOffset = kInputOrDebugPosOffset + kPointerSize; |
| static const int kContinuationOffset = kResumeModeOffset + kPointerSize; |
| static const int kRegisterFileOffset = kContinuationOffset + kPointerSize; |
| static const int kSize = kRegisterFileOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSGeneratorObject); |
| }; |
| |
| class JSAsyncGeneratorObject : public JSGeneratorObject { |
| public: |
| DECL_CAST(JSAsyncGeneratorObject) |
| |
| // Dispatched behavior. |
| DECL_VERIFIER(JSAsyncGeneratorObject) |
| |
| // [queue] |
| // Pointer to the head of a singly linked list of AsyncGeneratorRequest, or |
| // undefined. |
| DECL_ACCESSORS(queue, HeapObject) |
| |
| // [awaited_promise] |
| // A reference to the Promise of an AwaitExpression. |
| DECL_ACCESSORS(awaited_promise, HeapObject) |
| |
| // Layout description. |
| static const int kQueueOffset = JSGeneratorObject::kSize; |
| static const int kAwaitedPromiseOffset = kQueueOffset + kPointerSize; |
| static const int kSize = kAwaitedPromiseOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSAsyncGeneratorObject); |
| }; |
| |
| // JSBoundFunction describes a bound function exotic object. |
| class JSBoundFunction : public JSObject { |
| public: |
| // [bound_target_function]: The wrapped function object. |
| inline Object* raw_bound_target_function() const; |
| DECL_ACCESSORS(bound_target_function, JSReceiver) |
| |
| // [bound_this]: The value that is always passed as the this value when |
| // calling the wrapped function. |
| DECL_ACCESSORS(bound_this, Object) |
| |
| // [bound_arguments]: A list of values whose elements are used as the first |
| // arguments to any call to the wrapped function. |
| DECL_ACCESSORS(bound_arguments, FixedArray) |
| |
| static MaybeHandle<String> GetName(Isolate* isolate, |
| Handle<JSBoundFunction> function); |
| static MaybeHandle<Context> GetFunctionRealm( |
| Handle<JSBoundFunction> function); |
| |
| DECL_CAST(JSBoundFunction) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSBoundFunction) |
| DECL_VERIFIER(JSBoundFunction) |
| |
| // The bound function's string representation implemented according |
| // to ES6 section 19.2.3.5 Function.prototype.toString ( ). |
| static Handle<String> ToString(Handle<JSBoundFunction> function); |
| |
| // Layout description. |
| static const int kBoundTargetFunctionOffset = JSObject::kHeaderSize; |
| static const int kBoundThisOffset = kBoundTargetFunctionOffset + kPointerSize; |
| static const int kBoundArgumentsOffset = kBoundThisOffset + kPointerSize; |
| static const int kSize = kBoundArgumentsOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSBoundFunction); |
| }; |
| |
| |
| // JSFunction describes JavaScript functions. |
| class JSFunction: public JSObject { |
| public: |
| // [prototype_or_initial_map]: |
| DECL_ACCESSORS(prototype_or_initial_map, Object) |
| |
| // [shared]: The information about the function that |
| // can be shared by instances. |
| DECL_ACCESSORS(shared, SharedFunctionInfo) |
| |
| static const int kLengthDescriptorIndex = 0; |
| static const int kNameDescriptorIndex = 1; |
| |
| // [context]: The context for this function. |
| inline Context* context(); |
| inline bool has_context() const; |
| inline void set_context(Object* context); |
| inline JSObject* global_proxy(); |
| inline Context* native_context(); |
| |
| static Handle<Object> GetName(Isolate* isolate, Handle<JSFunction> function); |
| static MaybeHandle<Smi> GetLength(Isolate* isolate, |
| Handle<JSFunction> function); |
| static Handle<Context> GetFunctionRealm(Handle<JSFunction> function); |
| |
| // [code]: The generated code object for this function. Executed |
| // when the function is invoked, e.g. foo() or new foo(). See |
| // [[Call]] and [[Construct]] description in ECMA-262, section |
| // 8.6.2, page 27. |
| inline Code* code(); |
| inline void set_code(Code* code); |
| inline void set_code_no_write_barrier(Code* code); |
| |
| // Get the abstract code associated with the function, which will either be |
| // a Code object or a BytecodeArray. |
| inline AbstractCode* abstract_code(); |
| |
| // Tells whether or not this function is interpreted. |
| // |
| // Note: function->IsInterpreted() does not necessarily return the same value |
| // as function->shared()->IsInterpreted() because the closure might have been |
| // optimized. |
| inline bool IsInterpreted(); |
| |
| // Tells whether or not this function checks its optimization marker in its |
| // feedback vector. |
| inline bool ChecksOptimizationMarker(); |
| |
| // Tells whether or not this function holds optimized code. |
| // |
| // Note: Returning false does not necessarily mean that this function hasn't |
| // been optimized, as it may have optimized code on its feedback vector. |
| inline bool IsOptimized(); |
| |
| // Tells whether or not this function has optimized code available to it, |
| // either because it is optimized or because it has optimized code in its |
| // feedback vector. |
| inline bool HasOptimizedCode(); |
| |
| // Tells whether or not this function has a (non-zero) optimization marker. |
| inline bool HasOptimizationMarker(); |
| |
| // Mark this function for lazy recompilation. The function will be recompiled |
| // the next time it is executed. |
| void MarkForOptimization(ConcurrencyMode mode); |
| |
| // Tells whether or not the function is already marked for lazy recompilation. |
| inline bool IsMarkedForOptimization(); |
| inline bool IsMarkedForConcurrentOptimization(); |
| |
| // Tells whether or not the function is on the concurrent recompilation queue. |
| inline bool IsInOptimizationQueue(); |
| |
| // Clears the optimized code slot in the function's feedback vector. |
| inline void ClearOptimizedCodeSlot(const char* reason); |
| |
| // Sets the optimization marker in the function's feedback vector. |
| inline void SetOptimizationMarker(OptimizationMarker marker); |
| |
| // Clears the optimization marker in the function's feedback vector. |
| inline void ClearOptimizationMarker(); |
| |
| // Completes inobject slack tracking on initial map if it is active. |
| inline void CompleteInobjectSlackTrackingIfActive(); |
| |
| // [feedback_vector_cell]: The feedback vector. |
| DECL_ACCESSORS(feedback_vector_cell, Cell) |
| |
| enum FeedbackVectorState { |
| TOP_LEVEL_SCRIPT_NEEDS_VECTOR, |
| NEEDS_VECTOR, |
| HAS_VECTOR |
| }; |
| |
| inline FeedbackVectorState GetFeedbackVectorState(Isolate* isolate) const; |
| |
| // feedback_vector() can be used once the function is compiled. |
| inline FeedbackVector* feedback_vector() const; |
| inline bool has_feedback_vector() const; |
| static void EnsureLiterals(Handle<JSFunction> function); |
| |
| // Unconditionally clear the type feedback vector. |
| void ClearTypeFeedbackInfo(); |
| |
| // The initial map for an object created by this constructor. |
| inline Map* initial_map(); |
| static void SetInitialMap(Handle<JSFunction> function, Handle<Map> map, |
| Handle<Object> prototype); |
| inline bool has_initial_map(); |
| static void EnsureHasInitialMap(Handle<JSFunction> function); |
| |
| // Creates a map that matches the constructor's initial map, but with |
| // [[prototype]] being new.target.prototype. Because new.target can be a |
| // JSProxy, this can call back into JavaScript. |
| static MUST_USE_RESULT MaybeHandle<Map> GetDerivedMap( |
| Isolate* isolate, Handle<JSFunction> constructor, |
| Handle<JSReceiver> new_target); |
| |
| // Get and set the prototype property on a JSFunction. If the |
| // function has an initial map the prototype is set on the initial |
| // map. Otherwise, the prototype is put in the initial map field |
| // until an initial map is needed. |
| inline bool has_prototype(); |
| inline bool has_instance_prototype(); |
| inline Object* prototype(); |
| inline Object* instance_prototype(); |
| static void SetPrototype(Handle<JSFunction> function, |
| Handle<Object> value); |
| |
| // Returns if this function has been compiled to native code yet. |
| inline bool is_compiled(); |
| |
| // Prints the name of the function using PrintF. |
| void PrintName(FILE* out = stdout); |
| |
| DECL_CAST(JSFunction) |
| |
| // Calculate the instance size and in-object properties count. |
| static void CalculateInstanceSizeForDerivedClass( |
| Handle<JSFunction> function, InstanceType instance_type, |
| int requested_embedder_fields, int* instance_size, |
| int* in_object_properties); |
| static void CalculateInstanceSizeHelper(InstanceType instance_type, |
| int requested_embedder_fields, |
| int requested_in_object_properties, |
| int* instance_size, |
| int* in_object_properties); |
| |
| class BodyDescriptor; |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSFunction) |
| DECL_VERIFIER(JSFunction) |
| |
| // The function's name if it is configured, otherwise shared function info |
| // debug name. |
| static Handle<String> GetName(Handle<JSFunction> function); |
| |
| // ES6 section 9.2.11 SetFunctionName |
| // Because of the way this abstract operation is used in the spec, |
| // it should never fail, but in practice it will fail if the generated |
| // function name's length exceeds String::kMaxLength. |
| static MUST_USE_RESULT bool SetName(Handle<JSFunction> function, |
| Handle<Name> name, Handle<String> prefix); |
| |
| // The function's displayName if it is set, otherwise name if it is |
| // configured, otherwise shared function info |
| // debug name. |
| static Handle<String> GetDebugName(Handle<JSFunction> function); |
| |
| // The function's string representation implemented according to |
| // ES6 section 19.2.3.5 Function.prototype.toString ( ). |
| static Handle<String> ToString(Handle<JSFunction> function); |
| |
| // Layout descriptors. The last property (from kNonWeakFieldsEndOffset to |
| // kSize) is weak and has special handling during garbage collection. |
| static const int kPrototypeOrInitialMapOffset = JSObject::kHeaderSize; |
| static const int kSharedFunctionInfoOffset = |
| kPrototypeOrInitialMapOffset + kPointerSize; |
| static const int kContextOffset = kSharedFunctionInfoOffset + kPointerSize; |
| static const int kFeedbackVectorOffset = kContextOffset + kPointerSize; |
| static const int kCodeOffset = kFeedbackVectorOffset + kPointerSize; |
| static const int kSize = kCodeOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSFunction); |
| }; |
| |
| |
| // JSGlobalProxy's prototype must be a JSGlobalObject or null, |
| // and the prototype is hidden. JSGlobalProxy always delegates |
| // property accesses to its prototype if the prototype is not null. |
| // |
| // A JSGlobalProxy can be reinitialized which will preserve its identity. |
| // |
| // Accessing a JSGlobalProxy requires security check. |
| |
| class JSGlobalProxy : public JSObject { |
| public: |
| // [native_context]: the owner native context of this global proxy object. |
| // It is null value if this object is not used by any context. |
| DECL_ACCESSORS(native_context, Object) |
| |
| // [hash]: The hash code property (undefined if not initialized yet). |
| DECL_ACCESSORS(hash, Object) |
| |
| DECL_CAST(JSGlobalProxy) |
| |
| inline bool IsDetachedFrom(JSGlobalObject* global) const; |
| |
| static int SizeWithEmbedderFields(int embedder_field_count); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSGlobalProxy) |
| DECL_VERIFIER(JSGlobalProxy) |
| |
| // Layout description. |
| static const int kNativeContextOffset = JSObject::kHeaderSize; |
| static const int kHashOffset = kNativeContextOffset + kPointerSize; |
| static const int kSize = kHashOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalProxy); |
| }; |
| |
| |
| // JavaScript global object. |
| class JSGlobalObject : public JSObject { |
| public: |
| // [native context]: the natives corresponding to this global object. |
| DECL_ACCESSORS(native_context, Context) |
| |
| // [global proxy]: the global proxy object of the context |
| DECL_ACCESSORS(global_proxy, JSObject) |
| |
| // Gets global object properties. |
| inline GlobalDictionary* global_dictionary(); |
| inline void set_global_dictionary(GlobalDictionary* dictionary); |
| |
| static void InvalidatePropertyCell(Handle<JSGlobalObject> object, |
| Handle<Name> name); |
| // Ensure that the global object has a cell for the given property name. |
| static Handle<PropertyCell> EnsureEmptyPropertyCell( |
| Handle<JSGlobalObject> global, Handle<Name> name, |
| PropertyCellType cell_type, int* entry_out = nullptr); |
| |
| DECL_CAST(JSGlobalObject) |
| |
| inline bool IsDetached(); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSGlobalObject) |
| DECL_VERIFIER(JSGlobalObject) |
| |
| // Layout description. |
| static const int kNativeContextOffset = JSObject::kHeaderSize; |
| static const int kGlobalProxyOffset = kNativeContextOffset + kPointerSize; |
| static const int kHeaderSize = kGlobalProxyOffset + kPointerSize; |
| static const int kSize = kHeaderSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalObject); |
| }; |
| |
| |
| // Representation for JS Wrapper objects, String, Number, Boolean, etc. |
| class JSValue: public JSObject { |
| public: |
| // [value]: the object being wrapped. |
| DECL_ACCESSORS(value, Object) |
| |
| DECL_CAST(JSValue) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSValue) |
| DECL_VERIFIER(JSValue) |
| |
| // Layout description. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kSize = kValueOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSValue); |
| }; |
| |
| |
| class DateCache; |
| |
| // Representation for JS date objects. |
| class JSDate: public JSObject { |
| public: |
| static MUST_USE_RESULT MaybeHandle<JSDate> New(Handle<JSFunction> constructor, |
| Handle<JSReceiver> new_target, |
| double tv); |
| |
| // If one component is NaN, all of them are, indicating a NaN time value. |
| // [value]: the time value. |
| DECL_ACCESSORS(value, Object) |
| // [year]: caches year. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(year, Object) |
| // [month]: caches month. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(month, Object) |
| // [day]: caches day. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(day, Object) |
| // [weekday]: caches day of week. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(weekday, Object) |
| // [hour]: caches hours. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(hour, Object) |
| // [min]: caches minutes. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(min, Object) |
| // [sec]: caches seconds. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(sec, Object) |
| // [cache stamp]: sample of the date cache stamp at the |
| // moment when chached fields were cached. |
| DECL_ACCESSORS(cache_stamp, Object) |
| |
| DECL_CAST(JSDate) |
| |
| // Returns the time value (UTC) identifying the current time. |
| static double CurrentTimeValue(Isolate* isolate); |
| |
| // Returns the date field with the specified index. |
| // See FieldIndex for the list of date fields. |
| static Object* GetField(Object* date, Smi* index); |
| |
| static Handle<Object> SetValue(Handle<JSDate> date, double v); |
| |
| void SetValue(Object* value, bool is_value_nan); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSDate) |
| DECL_VERIFIER(JSDate) |
| |
| // The order is important. It must be kept in sync with date macros |
| // in macros.py. |
| enum FieldIndex { |
| kDateValue, |
| kYear, |
| kMonth, |
| kDay, |
| kWeekday, |
| kHour, |
| kMinute, |
| kSecond, |
| kFirstUncachedField, |
| kMillisecond = kFirstUncachedField, |
| kDays, |
| kTimeInDay, |
| kFirstUTCField, |
| kYearUTC = kFirstUTCField, |
| kMonthUTC, |
| kDayUTC, |
| kWeekdayUTC, |
| kHourUTC, |
| kMinuteUTC, |
| kSecondUTC, |
| kMillisecondUTC, |
| kDaysUTC, |
| kTimeInDayUTC, |
| kTimezoneOffset |
| }; |
| |
| // Layout description. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kYearOffset = kValueOffset + kPointerSize; |
| static const int kMonthOffset = kYearOffset + kPointerSize; |
| static const int kDayOffset = kMonthOffset + kPointerSize; |
| static const int kWeekdayOffset = kDayOffset + kPointerSize; |
| static const int kHourOffset = kWeekdayOffset + kPointerSize; |
| static const int kMinOffset = kHourOffset + kPointerSize; |
| static const int kSecOffset = kMinOffset + kPointerSize; |
| static const int kCacheStampOffset = kSecOffset + kPointerSize; |
| static const int kSize = kCacheStampOffset + kPointerSize; |
| |
| private: |
| inline Object* DoGetField(FieldIndex index); |
| |
| Object* GetUTCField(FieldIndex index, double value, DateCache* date_cache); |
| |
| // Computes and caches the cacheable fields of the date. |
| inline void SetCachedFields(int64_t local_time_ms, DateCache* date_cache); |
| |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSDate); |
| }; |
| |
| |
| // Representation of message objects used for error reporting through |
| // the API. The messages are formatted in JavaScript so this object is |
| // a real JavaScript object. The information used for formatting the |
| // error messages are not directly accessible from JavaScript to |
| // prevent leaking information to user code called during error |
| // formatting. |
| class JSMessageObject: public JSObject { |
| public: |
| // [type]: the type of error message. |
| inline int type() const; |
| inline void set_type(int value); |
| |
| // [arguments]: the arguments for formatting the error message. |
| DECL_ACCESSORS(argument, Object) |
| |
| // [script]: the script from which the error message originated. |
| DECL_ACCESSORS(script, Object) |
| |
| // [stack_frames]: an array of stack frames for this error object. |
| DECL_ACCESSORS(stack_frames, Object) |
| |
| // [start_position]: the start position in the script for the error message. |
| inline int start_position() const; |
| inline void set_start_position(int value); |
| |
| // [end_position]: the end position in the script for the error message. |
| inline int end_position() const; |
| inline void set_end_position(int value); |
| |
| // Returns the line number for the error message (1-based), or |
| // Message::kNoLineNumberInfo if the line cannot be determined. |
| int GetLineNumber() const; |
| |
| // Returns the offset of the given position within the containing line. |
| int GetColumnNumber() const; |
| |
| // Returns the source code line containing the given source |
| // position, or the empty string if the position is invalid. |
| Handle<String> GetSourceLine() const; |
| |
| inline int error_level() const; |
| inline void set_error_level(int level); |
| |
| DECL_CAST(JSMessageObject) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSMessageObject) |
| DECL_VERIFIER(JSMessageObject) |
| |
| // Layout description. |
| static const int kTypeOffset = JSObject::kHeaderSize; |
| static const int kArgumentsOffset = kTypeOffset + kPointerSize; |
| static const int kScriptOffset = kArgumentsOffset + kPointerSize; |
| static const int kStackFramesOffset = kScriptOffset + kPointerSize; |
| static const int kStartPositionOffset = kStackFramesOffset + kPointerSize; |
| static const int kEndPositionOffset = kStartPositionOffset + kPointerSize; |
| static const int kErrorLevelOffset = kEndPositionOffset + kPointerSize; |
| static const int kSize = kErrorLevelOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<HeapObject::kMapOffset, |
| kStackFramesOffset + kPointerSize, |
| kSize> BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| }; |
| |
| class JSPromise : public JSObject { |
| public: |
| DECL_ACCESSORS(result, Object) |
| |
| // There are 3 possible states for these fields -- |
| // 1) Undefined -- This is the zero state when there is no callback |
| // or deferred fields registered. |
| // |
| // 2) Object -- There is a single callback directly attached to the |
| // fulfill_reactions, reject_reactions and the deferred fields are |
| // directly attached to the slots. In this state, deferred_promise |
| // is a JSReceiver and deferred_on_{resolve, reject} are Callables. |
| // |
| // 3) FixedArray -- There is more than one callback and deferred |
| // fields attached to a FixedArray. |
| // |
| // The callback can be a Callable or a Symbol. |
| DECL_ACCESSORS(deferred_promise, Object) |
| DECL_ACCESSORS(deferred_on_resolve, Object) |
| DECL_ACCESSORS(deferred_on_reject, Object) |
| DECL_ACCESSORS(fulfill_reactions, Object) |
| DECL_ACCESSORS(reject_reactions, Object) |
| |
| DECL_INT_ACCESSORS(flags) |
| |
| // [has_handler]: Whether this promise has a reject handler or not. |
| DECL_BOOLEAN_ACCESSORS(has_handler) |
| |
| // [handled_hint]: Whether this promise will be handled by a catch |
| // block in an async function. |
| DECL_BOOLEAN_ACCESSORS(handled_hint) |
| |
| static const char* Status(v8::Promise::PromiseState status); |
| v8::Promise::PromiseState status() const; |
| |
| DECL_CAST(JSPromise) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSPromise) |
| DECL_VERIFIER(JSPromise) |
| |
| // Layout description. |
| static const int kResultOffset = JSObject::kHeaderSize; |
| static const int kDeferredPromiseOffset = kResultOffset + kPointerSize; |
| static const int kDeferredOnResolveOffset = |
| kDeferredPromiseOffset + kPointerSize; |
| static const int kDeferredOnRejectOffset = |
| kDeferredOnResolveOffset + kPointerSize; |
| static const int kFulfillReactionsOffset = |
| kDeferredOnRejectOffset + kPointerSize; |
| static const int kRejectReactionsOffset = |
| kFulfillReactionsOffset + kPointerSize; |
| static const int kFlagsOffset = kRejectReactionsOffset + kPointerSize; |
| static const int kSize = kFlagsOffset + kPointerSize; |
| static const int kSizeWithEmbedderFields = |
| kSize + v8::Promise::kEmbedderFieldCount * kPointerSize; |
| |
| // Flags layout. |
| // The first two bits store the v8::Promise::PromiseState. |
| static const int kStatusBits = 2; |
| static const int kHasHandlerBit = 2; |
| static const int kHandledHintBit = 3; |
| |
| static const int kStatusShift = 0; |
| static const int kStatusMask = 0x3; |
| STATIC_ASSERT(v8::Promise::kPending == 0); |
| STATIC_ASSERT(v8::Promise::kFulfilled == 1); |
| STATIC_ASSERT(v8::Promise::kRejected == 2); |
| }; |
| |
| // Regular expressions |
| // The regular expression holds a single reference to a FixedArray in |
| // the kDataOffset field. |
| // The FixedArray contains the following data: |
| // - tag : type of regexp implementation (not compiled yet, atom or irregexp) |
| // - reference to the original source string |
| // - reference to the original flag string |
| // If it is an atom regexp |
| // - a reference to a literal string to search for |
| // If it is an irregexp regexp: |
| // - a reference to code for Latin1 inputs (bytecode or compiled), or a smi |
| // used for tracking the last usage (used for regexp code flushing). |
| // - a reference to code for UC16 inputs (bytecode or compiled), or a smi |
| // used for tracking the last usage (used for regexp code flushing). |
| // - max number of registers used by irregexp implementations. |
| // - number of capture registers (output values) of the regexp. |
| class JSRegExp: public JSObject { |
| public: |
| // Meaning of Type: |
| // NOT_COMPILED: Initial value. No data has been stored in the JSRegExp yet. |
| // ATOM: A simple string to match against using an indexOf operation. |
| // IRREGEXP: Compiled with Irregexp. |
| enum Type { NOT_COMPILED, ATOM, IRREGEXP }; |
| enum Flag { |
| kNone = 0, |
| kGlobal = 1 << 0, |
| kIgnoreCase = 1 << 1, |
| kMultiline = 1 << 2, |
| kSticky = 1 << 3, |
| kUnicode = 1 << 4, |
| kDotAll = 1 << 5, |
| // Update FlagCount when adding new flags. |
| }; |
| typedef base::Flags<Flag> Flags; |
| |
| static int FlagCount() { return FLAG_harmony_regexp_dotall ? 6 : 5; } |
| |
| DECL_ACCESSORS(data, Object) |
| DECL_ACCESSORS(flags, Object) |
| DECL_ACCESSORS(last_index, Object) |
| DECL_ACCESSORS(source, Object) |
| |
| V8_EXPORT_PRIVATE static MaybeHandle<JSRegExp> New(Handle<String> source, |
| Flags flags); |
| static Handle<JSRegExp> Copy(Handle<JSRegExp> regexp); |
| |
| static MaybeHandle<JSRegExp> Initialize(Handle<JSRegExp> regexp, |
| Handle<String> source, Flags flags); |
| static MaybeHandle<JSRegExp> Initialize(Handle<JSRegExp> regexp, |
| Handle<String> source, |
| Handle<String> flags_string); |
| |
| inline Type TypeTag(); |
| // Number of captures (without the match itself). |
| inline int CaptureCount(); |
| inline Flags GetFlags(); |
| inline String* Pattern(); |
| inline Object* CaptureNameMap(); |
| inline Object* DataAt(int index); |
| // Set implementation data after the object has been prepared. |
| inline void SetDataAt(int index, Object* value); |
| |
| static int code_index(bool is_latin1) { |
| if (is_latin1) { |
| return kIrregexpLatin1CodeIndex; |
| } else { |
| return kIrregexpUC16CodeIndex; |
| } |
| } |
| |
| DECL_CAST(JSRegExp) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSRegExp) |
| DECL_VERIFIER(JSRegExp) |
| |
| static const int kDataOffset = JSObject::kHeaderSize; |
| static const int kSourceOffset = kDataOffset + kPointerSize; |
| static const int kFlagsOffset = kSourceOffset + kPointerSize; |
| static const int kSize = kFlagsOffset + kPointerSize; |
| static const int kLastIndexOffset = kSize; // In-object field. |
| |
| // Indices in the data array. |
| static const int kTagIndex = 0; |
| static const int kSourceIndex = kTagIndex + 1; |
| static const int kFlagsIndex = kSourceIndex + 1; |
| static const int kDataIndex = kFlagsIndex + 1; |
| // The data fields are used in different ways depending on the |
| // value of the tag. |
| // Atom regexps (literal strings). |
| static const int kAtomPatternIndex = kDataIndex; |
| |
| static const int kAtomDataSize = kAtomPatternIndex + 1; |
| |
| // Irregexp compiled code or bytecode for Latin1. If compilation |
| // fails, this fields hold an exception object that should be |
| // thrown if the regexp is used again. |
| static const int kIrregexpLatin1CodeIndex = kDataIndex; |
| // Irregexp compiled code or bytecode for UC16. If compilation |
| // fails, this fields hold an exception object that should be |
| // thrown if the regexp is used again. |
| static const int kIrregexpUC16CodeIndex = kDataIndex + 1; |
| // Maximal number of registers used by either Latin1 or UC16. |
| // Only used to check that there is enough stack space |
| static const int kIrregexpMaxRegisterCountIndex = kDataIndex + 2; |
| // Number of captures in the compiled regexp. |
| static const int kIrregexpCaptureCountIndex = kDataIndex + 3; |
| // Maps names of named capture groups (at indices 2i) to their corresponding |
| // (1-based) capture group indices (at indices 2i + 1). |
| static const int kIrregexpCaptureNameMapIndex = kDataIndex + 4; |
| |
| static const int kIrregexpDataSize = kIrregexpCaptureNameMapIndex + 1; |
| |
| // In-object fields. |
| static const int kLastIndexFieldIndex = 0; |
| static const int kInObjectFieldCount = 1; |
| |
| // The uninitialized value for a regexp code object. |
| static const int kUninitializedValue = -1; |
| }; |
| |
| DEFINE_OPERATORS_FOR_FLAGS(JSRegExp::Flags) |
| |
| class TypeFeedbackInfo : public Tuple3 { |
| public: |
| inline int ic_total_count(); |
| inline void set_ic_total_count(int count); |
| |
| inline int ic_with_type_info_count(); |
| inline void change_ic_with_type_info_count(int delta); |
| |
| inline int ic_generic_count(); |
| inline void change_ic_generic_count(int delta); |
| |
| inline void initialize_storage(); |
| |
| inline void change_own_type_change_checksum(); |
| inline int own_type_change_checksum(); |
| |
| inline void set_inlined_type_change_checksum(int checksum); |
| inline bool matches_inlined_type_change_checksum(int checksum); |
| |
| DECL_CAST(TypeFeedbackInfo) |
| |
| static const int kStorage1Offset = kValue1Offset; |
| static const int kStorage2Offset = kValue2Offset; |
| static const int kStorage3Offset = kValue3Offset; |
| |
| private: |
| static const int kTypeChangeChecksumBits = 7; |
| |
| class ICTotalCountField: public BitField<int, 0, |
| kSmiValueSize - kTypeChangeChecksumBits> {}; // NOLINT |
| class OwnTypeChangeChecksum: public BitField<int, |
| kSmiValueSize - kTypeChangeChecksumBits, |
| kTypeChangeChecksumBits> {}; // NOLINT |
| class ICsWithTypeInfoCountField: public BitField<int, 0, |
| kSmiValueSize - kTypeChangeChecksumBits> {}; // NOLINT |
| class InlinedTypeChangeChecksum: public BitField<int, |
| kSmiValueSize - kTypeChangeChecksumBits, |
| kTypeChangeChecksumBits> {}; // NOLINT |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(TypeFeedbackInfo); |
| }; |
| |
| class AllocationSite: public Struct { |
| public: |
| static const uint32_t kMaximumArrayBytesToPretransition = 8 * 1024; |
| static const double kPretenureRatio; |
| static const int kPretenureMinimumCreated = 100; |
| |
| // Values for pretenure decision field. |
| enum PretenureDecision { |
| kUndecided = 0, |
| kDontTenure = 1, |
| kMaybeTenure = 2, |
| kTenure = 3, |
| kZombie = 4, |
| kLastPretenureDecisionValue = kZombie |
| }; |
| |
| const char* PretenureDecisionName(PretenureDecision decision); |
| |
| // Contains either a Smi-encoded bitfield or a boilerplate. If it's a Smi the |
| // AllocationSite is for a constructed Array. |
| DECL_ACCESSORS(transition_info_or_boilerplate, Object) |
| DECL_ACCESSORS(boilerplate, JSObject) |
| DECL_INT_ACCESSORS(transition_info) |
| |
| // nested_site threads a list of sites that represent nested literals |
| // walked in a particular order. So [[1, 2], 1, 2] will have one |
| // nested_site, but [[1, 2], 3, [4]] will have a list of two. |
| DECL_ACCESSORS(nested_site, Object) |
| |
| // Bitfield containing pretenuring information. |
| DECL_INT_ACCESSORS(pretenure_data) |
| |
| DECL_INT_ACCESSORS(pretenure_create_count) |
| DECL_ACCESSORS(dependent_code, DependentCode) |
| |
| // heap->allocation_site_list() points to the last AllocationSite which form |
| // a linked list through the weak_next property. The GC might remove elements |
| // from the list by updateing weak_next. |
| DECL_ACCESSORS(weak_next, Object) |
| |
| inline void Initialize(); |
| |
| // This method is expensive, it should only be called for reporting. |
| bool IsNested(); |
| |
| // transition_info bitfields, for constructed array transition info. |
| class ElementsKindBits: public BitField<ElementsKind, 0, 15> {}; |
| class UnusedBits: public BitField<int, 15, 14> {}; |
| class DoNotInlineBit: public BitField<bool, 29, 1> {}; |
| |
| // Bitfields for pretenure_data |
| class MementoFoundCountBits: public BitField<int, 0, 26> {}; |
| class PretenureDecisionBits: public BitField<PretenureDecision, 26, 3> {}; |
| class DeoptDependentCodeBit: public BitField<bool, 29, 1> {}; |
| STATIC_ASSERT(PretenureDecisionBits::kMax >= kLastPretenureDecisionValue); |
| |
| // Increments the mementos found counter and returns true when the first |
| // memento was found for a given allocation site. |
| inline bool IncrementMementoFoundCount(int increment = 1); |
| |
| inline void IncrementMementoCreateCount(); |
| |
| PretenureFlag GetPretenureMode() const; |
| |
| void ResetPretenureDecision(); |
| |
| inline PretenureDecision pretenure_decision() const; |
| inline void set_pretenure_decision(PretenureDecision decision); |
| |
| inline bool deopt_dependent_code() const; |
| inline void set_deopt_dependent_code(bool deopt); |
| |
| inline int memento_found_count() const; |
| inline void set_memento_found_count(int count); |
| |
| inline int memento_create_count() const; |
| inline void set_memento_create_count(int count); |
| |
| // The pretenuring decision is made during gc, and the zombie state allows |
| // us to recognize when an allocation site is just being kept alive because |
| // a later traversal of new space may discover AllocationMementos that point |
| // to this AllocationSite. |
| inline bool IsZombie() const; |
| |
| inline bool IsMaybeTenure() const; |
| |
| inline void MarkZombie(); |
| |
| inline bool MakePretenureDecision(PretenureDecision current_decision, |
| double ratio, |
| bool maximum_size_scavenge); |
| |
| inline bool DigestPretenuringFeedback(bool maximum_size_scavenge); |
| |
| inline ElementsKind GetElementsKind() const; |
| inline void SetElementsKind(ElementsKind kind); |
| |
| inline bool CanInlineCall() const; |
| inline void SetDoNotInlineCall(); |
| |
| inline bool PointsToLiteral() const; |
| |
| template <AllocationSiteUpdateMode update_or_check = |
| AllocationSiteUpdateMode::kUpdate> |
| static bool DigestTransitionFeedback(Handle<AllocationSite> site, |
| ElementsKind to_kind); |
| |
| DECL_PRINTER(AllocationSite) |
| DECL_VERIFIER(AllocationSite) |
| |
| DECL_CAST(AllocationSite) |
| static inline bool ShouldTrack(ElementsKind boilerplate_elements_kind); |
| static bool ShouldTrack(ElementsKind from, ElementsKind to); |
| static inline bool CanTrack(InstanceType type); |
| |
| static const int kTransitionInfoOrBoilerplateOffset = HeapObject::kHeaderSize; |
| static const int kNestedSiteOffset = |
| kTransitionInfoOrBoilerplateOffset + kPointerSize; |
| static const int kPretenureDataOffset = kNestedSiteOffset + kPointerSize; |
| static const int kPretenureCreateCountOffset = |
| kPretenureDataOffset + kPointerSize; |
| static const int kDependentCodeOffset = |
| kPretenureCreateCountOffset + kPointerSize; |
| static const int kWeakNextOffset = kDependentCodeOffset + kPointerSize; |
| static const int kSize = kWeakNextOffset + kPointerSize; |
| |
| // During mark compact we need to take special care for the dependent code |
| // field. |
| static const int kPointerFieldsBeginOffset = |
| kTransitionInfoOrBoilerplateOffset; |
| static const int kPointerFieldsEndOffset = kWeakNextOffset; |
| |
| // Ignores weakness. |
| typedef FixedBodyDescriptor<HeapObject::kHeaderSize, kSize, kSize> |
| BodyDescriptor; |
| |
| // Respects weakness. |
| typedef FixedBodyDescriptor<kPointerFieldsBeginOffset, |
| kPointerFieldsEndOffset, kSize> |
| BodyDescriptorWeak; |
| |
| private: |
| inline bool PretenuringDecisionMade() const; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationSite); |
| }; |
| |
| |
| class AllocationMemento: public Struct { |
| public: |
| static const int kAllocationSiteOffset = HeapObject::kHeaderSize; |
| static const int kSize = kAllocationSiteOffset + kPointerSize; |
| |
| DECL_ACCESSORS(allocation_site, Object) |
| |
| inline bool IsValid() const; |
| inline AllocationSite* GetAllocationSite() const; |
| inline Address GetAllocationSiteUnchecked() const; |
| |
| DECL_PRINTER(AllocationMemento) |
| DECL_VERIFIER(AllocationMemento) |
| |
| DECL_CAST(AllocationMemento) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationMemento); |
| }; |
| |
| |
| // Utility superclass for stack-allocated objects that must be updated |
| // on gc. It provides two ways for the gc to update instances, either |
| // iterating or updating after gc. |
| class Relocatable BASE_EMBEDDED { |
| public: |
| explicit inline Relocatable(Isolate* isolate); |
| inline virtual ~Relocatable(); |
| virtual void IterateInstance(RootVisitor* v) {} |
| virtual void PostGarbageCollection() { } |
| |
| static void PostGarbageCollectionProcessing(Isolate* isolate); |
| static int ArchiveSpacePerThread(); |
| static char* ArchiveState(Isolate* isolate, char* to); |
| static char* RestoreState(Isolate* isolate, char* from); |
| static void Iterate(Isolate* isolate, RootVisitor* v); |
| static void Iterate(RootVisitor* v, Relocatable* top); |
| static char* Iterate(RootVisitor* v, char* t); |
| |
| private: |
| Isolate* isolate_; |
| Relocatable* prev_; |
| }; |
| |
| template <typename T> |
| class VectorIterator { |
| public: |
| VectorIterator(T* d, int l) : data_(Vector<const T>(d, l)), index_(0) { } |
| explicit VectorIterator(Vector<const T> data) : data_(data), index_(0) { } |
| T GetNext() { return data_[index_++]; } |
| bool has_more() { return index_ < data_.length(); } |
| private: |
| Vector<const T> data_; |
| int index_; |
| }; |
| |
| |
| // The Oddball describes objects null, undefined, true, and false. |
| class Oddball: public HeapObject { |
| public: |
| // [to_number_raw]: Cached raw to_number computed at startup. |
| inline double to_number_raw() const; |
| inline void set_to_number_raw(double value); |
| inline void set_to_number_raw_as_bits(uint64_t bits); |
| |
| // [to_string]: Cached to_string computed at startup. |
| DECL_ACCESSORS(to_string, String) |
| |
| // [to_number]: Cached to_number computed at startup. |
| DECL_ACCESSORS(to_number, Object) |
| |
| // [typeof]: Cached type_of computed at startup. |
| DECL_ACCESSORS(type_of, String) |
| |
| inline byte kind() const; |
| inline void set_kind(byte kind); |
| |
| // ES6 section 7.1.3 ToNumber for Boolean, Null, Undefined. |
| MUST_USE_RESULT static inline Handle<Object> ToNumber(Handle<Oddball> input); |
| |
| DECL_CAST(Oddball) |
| |
| // Dispatched behavior. |
| DECL_VERIFIER(Oddball) |
| |
| // Initialize the fields. |
| static void Initialize(Isolate* isolate, Handle<Oddball> oddball, |
| const char* to_string, Handle<Object> to_number, |
| const char* type_of, byte kind); |
| |
| // Layout description. |
| static const int kToNumberRawOffset = HeapObject::kHeaderSize; |
| static const int kToStringOffset = kToNumberRawOffset + kDoubleSize; |
| static const int kToNumberOffset = kToStringOffset + kPointerSize; |
| static const int kTypeOfOffset = kToNumberOffset + kPointerSize; |
| static const int kKindOffset = kTypeOfOffset + kPointerSize; |
| static const int kSize = kKindOffset + kPointerSize; |
| |
| static const byte kFalse = 0; |
| static const byte kTrue = 1; |
| static const byte kNotBooleanMask = static_cast<byte>(~1); |
| static const byte kTheHole = 2; |
| static const byte kNull = 3; |
| static const byte kArgumentsMarker = 4; |
| static const byte kUndefined = 5; |
| static const byte kUninitialized = 6; |
| static const byte kOther = 7; |
| static const byte kException = 8; |
| static const byte kOptimizedOut = 9; |
| static const byte kStaleRegister = 10; |
| |
| typedef FixedBodyDescriptor<kToStringOffset, kTypeOfOffset + kPointerSize, |
| kSize> BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| STATIC_ASSERT(kToNumberRawOffset == HeapNumber::kValueOffset); |
| STATIC_ASSERT(kKindOffset == Internals::kOddballKindOffset); |
| STATIC_ASSERT(kNull == Internals::kNullOddballKind); |
| STATIC_ASSERT(kUndefined == Internals::kUndefinedOddballKind); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Oddball); |
| }; |
| |
| |
| class Cell: public HeapObject { |
| public: |
| // [value]: value of the cell. |
| DECL_ACCESSORS(value, Object) |
| |
| DECL_CAST(Cell) |
| |
| static inline Cell* FromValueAddress(Address value) { |
| Object* result = FromAddress(value - kValueOffset); |
| return static_cast<Cell*>(result); |
| } |
| |
| inline Address ValueAddress() { |
| return address() + kValueOffset; |
| } |
| |
| // Dispatched behavior. |
| DECL_PRINTER(Cell) |
| DECL_VERIFIER(Cell) |
| |
| // Layout description. |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| static const int kSize = kValueOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<kValueOffset, |
| kValueOffset + kPointerSize, |
| kSize> BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Cell); |
| }; |
| |
| |
| class PropertyCell : public HeapObject { |
| public: |
| // [name]: the name of the global property. |
| DECL_ACCESSORS(name, Name) |
| // [property_details]: details of the global property. |
| DECL_ACCESSORS(property_details_raw, Object) |
| // [value]: value of the global property. |
| DECL_ACCESSORS(value, Object) |
| // [dependent_code]: dependent code that depends on the type of the global |
| // property. |
| DECL_ACCESSORS(dependent_code, DependentCode) |
| |
| inline PropertyDetails property_details(); |
| inline void set_property_details(PropertyDetails details); |
| |
| PropertyCellConstantType GetConstantType(); |
| |
| // Computes the new type of the cell's contents for the given value, but |
| // without actually modifying the details. |
| static PropertyCellType UpdatedType(Handle<PropertyCell> cell, |
| Handle<Object> value, |
| PropertyDetails details); |
| // Prepares property cell at given entry for receiving given value. |
| // As a result the old cell could be invalidated and/or dependent code could |
| // be deoptimized. Returns the prepared property cell. |
| static Handle<PropertyCell> PrepareForValue( |
| Handle<GlobalDictionary> dictionary, int entry, Handle<Object> value, |
| PropertyDetails details); |
| |
| static Handle<PropertyCell> InvalidateEntry( |
| Handle<GlobalDictionary> dictionary, int entry); |
| |
| static void SetValueWithInvalidation(Handle<PropertyCell> cell, |
| Handle<Object> new_value); |
| |
| DECL_CAST(PropertyCell) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(PropertyCell) |
| DECL_VERIFIER(PropertyCell) |
| |
| // Layout description. |
| static const int kDetailsOffset = HeapObject::kHeaderSize; |
| static const int kNameOffset = kDetailsOffset + kPointerSize; |
| static const int kValueOffset = kNameOffset + kPointerSize; |
| static const int kDependentCodeOffset = kValueOffset + kPointerSize; |
| static const int kSize = kDependentCodeOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<kNameOffset, kSize, kSize> BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PropertyCell); |
| }; |
| |
| |
| class WeakCell : public HeapObject { |
| public: |
| inline Object* value() const; |
| |
| // This should not be called by anyone except GC. |
| inline void clear(); |
| |
| // This should not be called by anyone except allocator. |
| inline void initialize(HeapObject* value); |
| |
| inline bool cleared() const; |
| |
| DECL_CAST(WeakCell) |
| |
| DECL_PRINTER(WeakCell) |
| DECL_VERIFIER(WeakCell) |
| |
| // Layout description. |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| static const int kSize = kValueOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<kValueOffset, kSize, kSize> BodyDescriptor; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(WeakCell); |
| }; |
| |
| |
| // The JSProxy describes EcmaScript Harmony proxies |
| class JSProxy: public JSReceiver { |
| public: |
| MUST_USE_RESULT static MaybeHandle<JSProxy> New(Isolate* isolate, |
| Handle<Object>, |
| Handle<Object>); |
| |
| // [handler]: The handler property. |
| DECL_ACCESSORS(handler, Object) |
| // [target]: The target property. |
| DECL_ACCESSORS(target, JSReceiver) |
| // [hash]: The hash code property (undefined if not initialized yet). |
| DECL_ACCESSORS(hash, Object) |
| |
| static MaybeHandle<Context> GetFunctionRealm(Handle<JSProxy> proxy); |
| |
| DECL_CAST(JSProxy) |
| |
| INLINE(bool IsRevoked() const); |
| static void Revoke(Handle<JSProxy> proxy); |
| |
| // ES6 9.5.1 |
| static MaybeHandle<Object> GetPrototype(Handle<JSProxy> receiver); |
| |
| // ES6 9.5.2 |
| MUST_USE_RESULT static Maybe<bool> SetPrototype(Handle<JSProxy> proxy, |
| Handle<Object> value, |
| bool from_javascript, |
| ShouldThrow should_throw); |
| // ES6 9.5.3 |
| MUST_USE_RESULT static Maybe<bool> IsExtensible(Handle<JSProxy> proxy); |
| |
| // ES6, #sec-isarray. NOT to be confused with %_IsArray. |
| MUST_USE_RESULT static Maybe<bool> IsArray(Handle<JSProxy> proxy); |
| |
| // ES6 9.5.4 (when passed DONT_THROW) |
| MUST_USE_RESULT static Maybe<bool> PreventExtensions( |
| Handle<JSProxy> proxy, ShouldThrow should_throw); |
| |
| // ES6 9.5.5 |
| MUST_USE_RESULT static Maybe<bool> GetOwnPropertyDescriptor( |
| Isolate* isolate, Handle<JSProxy> proxy, Handle<Name> name, |
| PropertyDescriptor* desc); |
| |
| // ES6 9.5.6 |
| MUST_USE_RESULT static Maybe<bool> DefineOwnProperty( |
| Isolate* isolate, Handle<JSProxy> object, Handle<Object> key, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| |
| // ES6 9.5.7 |
| MUST_USE_RESULT static Maybe<bool> HasProperty(Isolate* isolate, |
| Handle<JSProxy> proxy, |
| Handle<Name> name); |
| |
| // This function never returns false. |
| // It returns either true or throws. |
| MUST_USE_RESULT static Maybe<bool> CheckHasTrap(Isolate* isolate, |
| Handle<Name> name, |
| Handle<JSReceiver> target); |
| |
| // ES6 9.5.8 |
| MUST_USE_RESULT static MaybeHandle<Object> GetProperty( |
| Isolate* isolate, Handle<JSProxy> proxy, Handle<Name> name, |
| Handle<Object> receiver, bool* was_found); |
| |
| enum AccessKind { kGet, kSet }; |
| |
| static MaybeHandle<Object> CheckGetSetTrapResult(Isolate* isolate, |
| Handle<Name> name, |
| Handle<JSReceiver> target, |
| Handle<Object> trap_result, |
| AccessKind access_kind); |
| |
| // ES6 9.5.9 |
| MUST_USE_RESULT static Maybe<bool> SetProperty(Handle<JSProxy> proxy, |
| Handle<Name> name, |
| Handle<Object> value, |
| Handle<Object> receiver, |
| LanguageMode language_mode); |
| |
| // ES6 9.5.10 (when passed SLOPPY) |
| MUST_USE_RESULT static Maybe<bool> DeletePropertyOrElement( |
| Handle<JSProxy> proxy, Handle<Name> name, LanguageMode language_mode); |
| |
| // ES6 9.5.12 |
| MUST_USE_RESULT static Maybe<bool> OwnPropertyKeys( |
| Isolate* isolate, Handle<JSReceiver> receiver, Handle<JSProxy> proxy, |
| PropertyFilter filter, KeyAccumulator* accumulator); |
| |
| MUST_USE_RESULT static Maybe<PropertyAttributes> GetPropertyAttributes( |
| LookupIterator* it); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSProxy) |
| DECL_VERIFIER(JSProxy) |
| |
| static const int kMaxIterationLimit = 100 * 1024; |
| |
| // Layout description. |
| static const int kTargetOffset = JSReceiver::kHeaderSize; |
| static const int kHandlerOffset = kTargetOffset + kPointerSize; |
| static const int kHashOffset = kHandlerOffset + kPointerSize; |
| static const int kSize = kHashOffset + kPointerSize; |
| |
| // kTargetOffset aliases with the elements of JSObject. The fact that |
| // JSProxy::target is a Javascript value which cannot be confused with an |
| // elements backing store is exploited by loading from this offset from an |
| // unknown JSReceiver. |
| STATIC_ASSERT(JSObject::kElementsOffset == JSProxy::kTargetOffset); |
| |
| typedef FixedBodyDescriptor<JSReceiver::kPropertiesOrHashOffset, kSize, kSize> |
| BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| Object* GetIdentityHash(); |
| |
| Smi* GetOrCreateIdentityHash(Isolate* isolate); |
| |
| static Maybe<bool> SetPrivateProperty(Isolate* isolate, Handle<JSProxy> proxy, |
| Handle<Symbol> private_name, |
| PropertyDescriptor* desc, |
| ShouldThrow should_throw); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSProxy); |
| }; |
| |
| |
| class JSCollection : public JSObject { |
| public: |
| // [table]: the backing hash table |
| DECL_ACCESSORS(table, Object) |
| |
| static const int kTableOffset = JSObject::kHeaderSize; |
| static const int kSize = kTableOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSCollection); |
| }; |
| |
| |
| // The JSSet describes EcmaScript Harmony sets |
| // TODO(marja): When moving JSSet out of objects.h, move JSSetIterator (from |
| // objects/hash-table.h) into the same file. |
| class JSSet : public JSCollection { |
| public: |
| DECL_CAST(JSSet) |
| |
| static void Initialize(Handle<JSSet> set, Isolate* isolate); |
| static void Clear(Handle<JSSet> set); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSSet) |
| DECL_VERIFIER(JSSet) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSSet); |
| }; |
| |
| |
| // The JSMap describes EcmaScript Harmony maps |
| // TODO(marja): When moving JSMap out of objects.h, move JSMapIterator (from |
| // objects/hash-table.h) into the same file. |
| class JSMap : public JSCollection { |
| public: |
| DECL_CAST(JSMap) |
| |
| static void Initialize(Handle<JSMap> map, Isolate* isolate); |
| static void Clear(Handle<JSMap> map); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSMap) |
| DECL_VERIFIER(JSMap) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSMap); |
| }; |
| |
| class JSArrayIterator : public JSObject { |
| public: |
| DECL_PRINTER(JSArrayIterator) |
| DECL_VERIFIER(JSArrayIterator) |
| |
| DECL_CAST(JSArrayIterator) |
| |
| // [object]: the [[IteratedObject]] inobject property. |
| DECL_ACCESSORS(object, Object) |
| |
| // [index]: The [[ArrayIteratorNextIndex]] inobject property. |
| DECL_ACCESSORS(index, Object) |
| |
| // [map]: The Map of the [[IteratedObject]] field at the time the iterator is |
| // allocated. |
| DECL_ACCESSORS(object_map, Object) |
| |
| // Return the ElementsKind that a JSArrayIterator's [[IteratedObject]] is |
| // expected to have, based on its instance type. |
| static ElementsKind ElementsKindForInstanceType(InstanceType instance_type); |
| |
| static const int kIteratedObjectOffset = JSObject::kHeaderSize; |
| static const int kNextIndexOffset = kIteratedObjectOffset + kPointerSize; |
| static const int kIteratedObjectMapOffset = kNextIndexOffset + kPointerSize; |
| static const int kSize = kIteratedObjectMapOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArrayIterator); |
| }; |
| |
| // The [Async-from-Sync Iterator] object |
| // (proposal-async-iteration/#sec-async-from-sync-iterator-objects) |
| // An object which wraps an ordinary Iterator and converts it to behave |
| // according to the Async Iterator protocol. |
| // (See https://tc39.github.io/proposal-async-iteration/#sec-iteration) |
| class JSAsyncFromSyncIterator : public JSObject { |
| public: |
| DECL_CAST(JSAsyncFromSyncIterator) |
| DECL_PRINTER(JSAsyncFromSyncIterator) |
| DECL_VERIFIER(JSAsyncFromSyncIterator) |
| |
| // Async-from-Sync Iterator instances are ordinary objects that inherit |
| // properties from the %AsyncFromSyncIteratorPrototype% intrinsic object. |
| // Async-from-Sync Iterator instances are initially created with the internal |
| // slots listed in Table 4. |
| // (proposal-async-iteration/#table-async-from-sync-iterator-internal-slots) |
| DECL_ACCESSORS(sync_iterator, JSReceiver) |
| |
| // Offsets of object fields. |
| static const int kSyncIteratorOffset = JSObject::kHeaderSize; |
| static const int kSize = kSyncIteratorOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSAsyncFromSyncIterator); |
| }; |
| |
| class JSStringIterator : public JSObject { |
| public: |
| // Dispatched behavior. |
| DECL_PRINTER(JSStringIterator) |
| DECL_VERIFIER(JSStringIterator) |
| |
| DECL_CAST(JSStringIterator) |
| |
| // [string]: the [[IteratedString]] inobject property. |
| DECL_ACCESSORS(string, String) |
| |
| // [index]: The [[StringIteratorNextIndex]] inobject property. |
| inline int index() const; |
| inline void set_index(int value); |
| |
| static const int kStringOffset = JSObject::kHeaderSize; |
| static const int kNextIndexOffset = kStringOffset + kPointerSize; |
| static const int kSize = kNextIndexOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSStringIterator); |
| }; |
| |
| // Base class for both JSWeakMap and JSWeakSet |
| class JSWeakCollection: public JSObject { |
| public: |
| DECL_CAST(JSWeakCollection) |
| |
| // [table]: the backing hash table mapping keys to values. |
| DECL_ACCESSORS(table, Object) |
| |
| // [next]: linked list of encountered weak maps during GC. |
| DECL_ACCESSORS(next, Object) |
| |
| static void Initialize(Handle<JSWeakCollection> collection, Isolate* isolate); |
| static void Set(Handle<JSWeakCollection> collection, Handle<Object> key, |
| Handle<Object> value, int32_t hash); |
| static bool Delete(Handle<JSWeakCollection> collection, Handle<Object> key, |
| int32_t hash); |
| static Handle<JSArray> GetEntries(Handle<JSWeakCollection> holder, |
| int max_entries); |
| |
| static const int kTableOffset = JSObject::kHeaderSize; |
| static const int kNextOffset = kTableOffset + kPointerSize; |
| static const int kSize = kNextOffset + kPointerSize; |
| |
| // Visiting policy defines whether the table and next collection fields |
| // should be visited or not. |
| enum BodyVisitingPolicy { kIgnoreWeakness, kRespectWeakness }; |
| |
| // Iterates the function object according to the visiting policy. |
| template <BodyVisitingPolicy> |
| class BodyDescriptorImpl; |
| |
| // Visit the whole object. |
| typedef BodyDescriptorImpl<kIgnoreWeakness> BodyDescriptor; |
| |
| // Don't visit table and next collection fields. |
| typedef BodyDescriptorImpl<kRespectWeakness> BodyDescriptorWeak; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSWeakCollection); |
| }; |
| |
| |
| // The JSWeakMap describes EcmaScript Harmony weak maps |
| class JSWeakMap: public JSWeakCollection { |
| public: |
| DECL_CAST(JSWeakMap) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSWeakMap) |
| DECL_VERIFIER(JSWeakMap) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSWeakMap); |
| }; |
| |
| |
| // The JSWeakSet describes EcmaScript Harmony weak sets |
| class JSWeakSet: public JSWeakCollection { |
| public: |
| DECL_CAST(JSWeakSet) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSWeakSet) |
| DECL_VERIFIER(JSWeakSet) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSWeakSet); |
| }; |
| |
| |
| // Whether a JSArrayBuffer is a SharedArrayBuffer or not. |
| enum class SharedFlag { kNotShared, kShared }; |
| |
| |
| class JSArrayBuffer: public JSObject { |
| public: |
| // [backing_store]: backing memory for this array |
| DECL_ACCESSORS(backing_store, void) |
| |
| // [byte_length]: length in bytes |
| DECL_ACCESSORS(byte_length, Object) |
| |
| // [allocation_base]: the start of the memory allocation for this array, |
| // normally equal to backing_store |
| DECL_ACCESSORS(allocation_base, void) |
| |
| // [allocation_length]: the size of the memory allocation for this array, |
| // normally equal to byte_length |
| inline size_t allocation_length() const; |
| inline void set_allocation_length(size_t value); |
| |
| inline uint32_t bit_field() const; |
| inline void set_bit_field(uint32_t bits); |
| |
| // [is_external]: true indicates that the embedder is in charge of freeing the |
| // backing_store, while is_external == false means that v8 will free the |
| // memory block once all ArrayBuffers referencing it are collected by the GC. |
| inline bool is_external(); |
| inline void set_is_external(bool value); |
| |
| inline bool is_neuterable(); |
| inline void set_is_neuterable(bool value); |
| |
| inline bool was_neutered(); |
| inline void set_was_neutered(bool value); |
| |
| inline bool is_shared(); |
| inline void set_is_shared(bool value); |
| |
| inline bool has_guard_region() const; |
| inline void set_has_guard_region(bool value); |
| |
| // TODO(gdeepti): This flag is introduced to disable asm.js optimizations in |
| // js-typer-lowering.cc, remove when the asm.js case is fixed. |
| inline bool is_wasm_buffer(); |
| inline void set_is_wasm_buffer(bool value); |
| |
| DECL_CAST(JSArrayBuffer) |
| |
| void Neuter(); |
| |
| inline ArrayBuffer::Allocator::AllocationMode allocation_mode() const; |
| |
| void FreeBackingStore(); |
| |
| V8_EXPORT_PRIVATE static void Setup( |
| Handle<JSArrayBuffer> array_buffer, Isolate* isolate, bool is_external, |
| void* data, size_t allocated_length, |
| SharedFlag shared = SharedFlag::kNotShared); |
| |
| V8_EXPORT_PRIVATE static void Setup( |
| Handle<JSArrayBuffer> array_buffer, Isolate* isolate, bool is_external, |
| void* allocation_base, size_t allocation_length, void* data, |
| size_t byte_length, SharedFlag shared = SharedFlag::kNotShared); |
| |
| // Returns false if array buffer contents could not be allocated. |
| // In this case, |array_buffer| will not be set up. |
| static bool SetupAllocatingData( |
| Handle<JSArrayBuffer> array_buffer, Isolate* isolate, |
| size_t allocated_length, bool initialize = true, |
| SharedFlag shared = SharedFlag::kNotShared) WARN_UNUSED_RESULT; |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSArrayBuffer) |
| DECL_VERIFIER(JSArrayBuffer) |
| |
| static const int kByteLengthOffset = JSObject::kHeaderSize; |
| // The rest of the fields are not JSObjects, so they are not iterated over in |
| // objects-body-descriptors-inl.h. |
| static const int kBackingStoreOffset = kByteLengthOffset + kPointerSize; |
| static const int kAllocationBaseOffset = kBackingStoreOffset + kPointerSize; |
| static const int kAllocationLengthOffset = |
| kAllocationBaseOffset + kPointerSize; |
| static const int kBitFieldSlot = kAllocationLengthOffset + kSizetSize; |
| #if V8_TARGET_LITTLE_ENDIAN || !V8_HOST_ARCH_64_BIT |
| static const int kBitFieldOffset = kBitFieldSlot; |
| #else |
| static const int kBitFieldOffset = kBitFieldSlot + kIntSize; |
| #endif |
| static const int kSize = kBitFieldSlot + kPointerSize; |
| |
| static const int kSizeWithEmbedderFields = |
| kSize + v8::ArrayBuffer::kEmbedderFieldCount * kPointerSize; |
| |
| // Iterates all fields in the object including internal ones except |
| // kBackingStoreOffset and kBitFieldSlot. |
| class BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| class IsExternal : public BitField<bool, 1, 1> {}; |
| class IsNeuterable : public BitField<bool, 2, 1> {}; |
| class WasNeutered : public BitField<bool, 3, 1> {}; |
| class IsShared : public BitField<bool, 4, 1> {}; |
| class HasGuardRegion : public BitField<bool, 5, 1> {}; |
| class IsWasmBuffer : public BitField<bool, 6, 1> {}; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArrayBuffer); |
| }; |
| |
| |
| class JSArrayBufferView: public JSObject { |
| public: |
| // [buffer]: ArrayBuffer that this typed array views. |
| DECL_ACCESSORS(buffer, Object) |
| |
| // [byte_offset]: offset of typed array in bytes. |
| DECL_ACCESSORS(byte_offset, Object) |
| |
| // [byte_length]: length of typed array in bytes. |
| DECL_ACCESSORS(byte_length, Object) |
| |
| DECL_CAST(JSArrayBufferView) |
| |
| DECL_VERIFIER(JSArrayBufferView) |
| |
| inline bool WasNeutered() const; |
| |
| static const int kBufferOffset = JSObject::kHeaderSize; |
| static const int kByteOffsetOffset = kBufferOffset + kPointerSize; |
| static const int kByteLengthOffset = kByteOffsetOffset + kPointerSize; |
| static const int kViewSize = kByteLengthOffset + kPointerSize; |
| |
| private: |
| #ifdef VERIFY_HEAP |
| DECL_ACCESSORS(raw_byte_offset, Object) |
| DECL_ACCESSORS(raw_byte_length, Object) |
| #endif |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArrayBufferView); |
| }; |
| |
| |
| class JSTypedArray: public JSArrayBufferView { |
| public: |
| // [length]: length of typed array in elements. |
| DECL_ACCESSORS(length, Object) |
| inline uint32_t length_value() const; |
| |
| // ES6 9.4.5.3 |
| MUST_USE_RESULT static Maybe<bool> DefineOwnProperty( |
| Isolate* isolate, Handle<JSTypedArray> o, Handle<Object> key, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| |
| DECL_CAST(JSTypedArray) |
| |
| ExternalArrayType type(); |
| V8_EXPORT_PRIVATE size_t element_size(); |
| |
| Handle<JSArrayBuffer> GetBuffer(); |
| |
| static inline MaybeHandle<JSTypedArray> Validate(Isolate* isolate, |
| Handle<Object> receiver, |
| const char* method_name); |
| // ES7 section 22.2.4.6 Create ( constructor, argumentList ) |
| static MaybeHandle<JSTypedArray> Create(Isolate* isolate, |
| Handle<Object> default_ctor, int argc, |
| Handle<Object>* argv, |
| const char* method_name); |
| // ES7 section 22.2.4.7 TypedArraySpeciesCreate ( exemplar, argumentList ) |
| static MaybeHandle<JSTypedArray> SpeciesCreate(Isolate* isolate, |
| Handle<JSTypedArray> exemplar, |
| int argc, Handle<Object>* argv, |
| const char* method_name); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSTypedArray) |
| DECL_VERIFIER(JSTypedArray) |
| |
| static const int kLengthOffset = kViewSize + kPointerSize; |
| static const int kSize = kLengthOffset + kPointerSize; |
| |
| static const int kSizeWithEmbedderFields = |
| kSize + v8::ArrayBufferView::kEmbedderFieldCount * kPointerSize; |
| |
| private: |
| static Handle<JSArrayBuffer> MaterializeArrayBuffer( |
| Handle<JSTypedArray> typed_array); |
| #ifdef VERIFY_HEAP |
| DECL_ACCESSORS(raw_length, Object) |
| #endif |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSTypedArray); |
| }; |
| |
| |
| class JSDataView: public JSArrayBufferView { |
| public: |
| DECL_CAST(JSDataView) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSDataView) |
| DECL_VERIFIER(JSDataView) |
| |
| static const int kSize = kViewSize; |
| |
| static const int kSizeWithEmbedderFields = |
| kSize + v8::ArrayBufferView::kEmbedderFieldCount * kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSDataView); |
| }; |
| |
| |
| // Foreign describes objects pointing from JavaScript to C structures. |
| class Foreign: public HeapObject { |
| public: |
| // [address]: field containing the address. |
| inline Address foreign_address(); |
| inline void set_foreign_address(Address value); |
| |
| DECL_CAST(Foreign) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(Foreign) |
| DECL_VERIFIER(Foreign) |
| |
| // Layout description. |
| |
| static const int kForeignAddressOffset = HeapObject::kHeaderSize; |
| static const int kSize = kForeignAddressOffset + kPointerSize; |
| |
| STATIC_ASSERT(kForeignAddressOffset == Internals::kForeignAddressOffset); |
| |
| class BodyDescriptor; |
| // No weak fields. |
| typedef BodyDescriptor BodyDescriptorWeak; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Foreign); |
| }; |
| |
| |
| // The JSArray describes JavaScript Arrays |
| // Such an array can be in one of two modes: |
| // - fast, backing storage is a FixedArray and length <= elements.length(); |
| // Please note: push and pop can be used to grow and shrink the array. |
| // - slow, backing storage is a HashTable with numbers as keys. |
| class JSArray: public JSObject { |
| public: |
| // [length]: The length property. |
| DECL_ACCESSORS(length, Object) |
| |
| // Overload the length setter to skip write barrier when the length |
| // is set to a smi. This matches the set function on FixedArray. |
| inline void set_length(Smi* length); |
| |
| static bool HasReadOnlyLength(Handle<JSArray> array); |
| static bool WouldChangeReadOnlyLength(Handle<JSArray> array, uint32_t index); |
| |
| // Initialize the array with the given capacity. The function may |
| // fail due to out-of-memory situations, but only if the requested |
| // capacity is non-zero. |
| static void Initialize(Handle<JSArray> array, int capacity, int length = 0); |
| |
| // If the JSArray has fast elements, and new_length would result in |
| // normalization, returns true. |
| bool SetLengthWouldNormalize(uint32_t new_length); |
| static inline bool SetLengthWouldNormalize(Heap* heap, uint32_t new_length); |
| |
| // Initializes the array to a certain length. |
| inline bool AllowsSetLength(); |
| |
| static void SetLength(Handle<JSArray> array, uint32_t length); |
| |
| // Set the content of the array to the content of storage. |
| static inline void SetContent(Handle<JSArray> array, |
| Handle<FixedArrayBase> storage); |
| |
| // ES6 9.4.2.1 |
| MUST_USE_RESULT static Maybe<bool> DefineOwnProperty( |
| Isolate* isolate, Handle<JSArray> o, Handle<Object> name, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| |
| static bool AnythingToArrayLength(Isolate* isolate, |
| Handle<Object> length_object, |
| uint32_t* output); |
| MUST_USE_RESULT static Maybe<bool> ArraySetLength(Isolate* isolate, |
| Handle<JSArray> a, |
| PropertyDescriptor* desc, |
| ShouldThrow should_throw); |
| |
| // Checks whether the Array has the current realm's Array.prototype as its |
| // prototype. This function is best-effort and only gives a conservative |
| // approximation, erring on the side of false, in particular with respect |
| // to Proxies and objects with a hidden prototype. |
| inline bool HasArrayPrototype(Isolate* isolate); |
| |
| DECL_CAST(JSArray) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(JSArray) |
| DECL_VERIFIER(JSArray) |
| |
| // Number of element slots to pre-allocate for an empty array. |
| static const int kPreallocatedArrayElements = 4; |
| |
| // Layout description. |
| static const int kLengthOffset = JSObject::kHeaderSize; |
| static const int kSize = kLengthOffset + kPointerSize; |
| |
| // Max. number of elements being copied in Array builtins. |
| static const int kMaxCopyElements = 100; |
| |
| // This constant is somewhat arbitrary. Any large enough value would work. |
| static const uint32_t kMaxFastArrayLength = 32 * 1024 * 1024; |
| |
| static const int kInitialMaxFastElementArray = |
| (kMaxRegularHeapObjectSize - FixedArray::kHeaderSize - kSize - |
| AllocationMemento::kSize) / |
| kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArray); |
| }; |
| |
| |
| Handle<Object> CacheInitialJSArrayMaps(Handle<Context> native_context, |
| Handle<Map> initial_map); |
| |
| |
| // JSRegExpResult is just a JSArray with a specific initial map. |
| // This initial map adds in-object properties for "index" and "input" |
| // properties, as assigned by RegExp.prototype.exec, which allows |
| // faster creation of RegExp exec results. |
| // This class just holds constants used when creating the result. |
| // After creation the result must be treated as a JSArray in all regards. |
| class JSRegExpResult: public JSArray { |
| public: |
| // Offsets of object fields. |
| static const int kIndexOffset = JSArray::kSize; |
| static const int kInputOffset = kIndexOffset + kPointerSize; |
| static const int kSize = kInputOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kIndexIndex = 0; |
| static const int kInputIndex = 1; |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSRegExpResult); |
| }; |
| |
| |
| // An accessor must have a getter, but can have no setter. |
| // |
| // When setting a property, V8 searches accessors in prototypes. |
| // If an accessor was found and it does not have a setter, |
| // the request is ignored. |
| // |
| // If the accessor in the prototype has the READ_ONLY property attribute, then |
| // a new value is added to the derived object when the property is set. |
| // This shadows the accessor in the prototype. |
| class AccessorInfo: public Struct { |
| public: |
| DECL_ACCESSORS(name, Object) |
| DECL_INT_ACCESSORS(flag) |
| DECL_ACCESSORS(expected_receiver_type, Object) |
| // This directly points at a foreign C function to be used from the runtime. |
| DECL_ACCESSORS(getter, Object) |
| DECL_ACCESSORS(setter, Object) |
| // This either points at the same as above, or a trampoline in case we are |
| // running with the simulator. Use these entries from generated code. |
| DECL_ACCESSORS(js_getter, Object) |
| DECL_ACCESSORS(data, Object) |
| |
| static Address redirect(Isolate* isolate, Address address, |
| AccessorComponent component); |
| Address redirected_getter() const; |
| |
| // Dispatched behavior. |
| DECL_PRINTER(AccessorInfo) |
| |
| inline bool all_can_read(); |
| inline void set_all_can_read(bool value); |
| |
| inline bool all_can_write(); |
| inline void set_all_can_write(bool value); |
| |
| inline bool is_special_data_property(); |
| inline void set_is_special_data_property(bool value); |
| |
| inline bool replace_on_access(); |
| inline void set_replace_on_access(bool value); |
| |
| inline bool is_sloppy(); |
| inline void set_is_sloppy(bool value); |
| |
| inline PropertyAttributes property_attributes(); |
| inline void set_property_attributes(PropertyAttributes attributes); |
| |
| // Checks whether the given receiver is compatible with this accessor. |
| static bool IsCompatibleReceiverMap(Isolate* isolate, |
| Handle<AccessorInfo> info, |
| Handle<Map> map); |
| inline bool IsCompatibleReceiver(Object* receiver); |
| |
| DECL_CAST(AccessorInfo) |
| |
| // Dispatched behavior. |
| DECL_VERIFIER(AccessorInfo) |
| |
| // Append all descriptors to the array that are not already there. |
| // Return number added. |
| static int AppendUnique(Handle<Object> descriptors, |
| Handle<FixedArray> array, |
| int valid_descriptors); |
| |
| static const int kNameOffset = HeapObject::kHeaderSize; |
| static const int kFlagOffset = kNameOffset + kPointerSize; |
| static const int kExpectedReceiverTypeOffset = kFlagOffset + kPointerSize; |
| static const int kSetterOffset = kExpectedReceiverTypeOffset + kPointerSize; |
| static const int kGetterOffset = kSetterOffset + kPointerSize; |
| static const int kJsGetterOffset = kGetterOffset + kPointerSize; |
| static const int kDataOffset = kJsGetterOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| |
| private: |
| inline bool HasExpectedReceiverType(); |
| |
| // Bit positions in flag. |
| static const int kAllCanReadBit = 0; |
| static const int kAllCanWriteBit = 1; |
| static const int kSpecialDataProperty = 2; |
| static const int kIsSloppy = 3; |
| static const int kReplaceOnAccess = 4; |
| class AttributesField : public BitField<PropertyAttributes, 5, 3> {}; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorInfo); |
| }; |
| |
| // Support for JavaScript accessors: A pair of a getter and a setter. Each |
| // accessor can either be |
| // * a JavaScript function or proxy: a real accessor |
| // * a FunctionTemplateInfo: a real (lazy) accessor |
| // * undefined: considered an accessor by the spec, too, strangely enough |
| // * null: an accessor which has not been set |
| class AccessorPair: public Struct { |
| public: |
| DECL_ACCESSORS(getter, Object) |
| DECL_ACCESSORS(setter, Object) |
| |
| DECL_CAST(AccessorPair) |
| |
| static Handle<AccessorPair> Copy(Handle<AccessorPair> pair); |
| |
| inline Object* get(AccessorComponent component); |
| inline void set(AccessorComponent component, Object* value); |
| |
| // Note: Returns undefined if the component is not set. |
| static Handle<Object> GetComponent(Handle<AccessorPair> accessor_pair, |
| AccessorComponent component); |
| |
| // Set both components, skipping arguments which are a JavaScript null. |
| inline void SetComponents(Object* getter, Object* setter); |
| |
| inline bool Equals(AccessorPair* pair); |
| inline bool Equals(Object* getter_value, Object* setter_value); |
| |
| inline bool ContainsAccessor(); |
| |
| // Dispatched behavior. |
| DECL_PRINTER(AccessorPair) |
| DECL_VERIFIER(AccessorPair) |
| |
| static const int kGetterOffset = HeapObject::kHeaderSize; |
| static const int kSetterOffset = kGetterOffset + kPointerSize; |
| static const int kSize = kSetterOffset + kPointerSize; |
| |
| private: |
| // Strangely enough, in addition to functions and harmony proxies, the spec |
| // requires us to consider undefined as a kind of accessor, too: |
| // var obj = {}; |
| // Object.defineProperty(obj, "foo", {get: undefined}); |
| // assertTrue("foo" in obj); |
| inline bool IsJSAccessor(Object* obj); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorPair); |
| }; |
| |
| |
| class AccessCheckInfo: public Struct { |
| public: |
| DECL_ACCESSORS(callback, Object) |
| DECL_ACCESSORS(named_interceptor, Object) |
| DECL_ACCESSORS(indexed_interceptor, Object) |
| DECL_ACCESSORS(data, Object) |
| |
| DECL_CAST(AccessCheckInfo) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(AccessCheckInfo) |
| DECL_VERIFIER(AccessCheckInfo) |
| |
| static AccessCheckInfo* Get(Isolate* isolate, Handle<JSObject> receiver); |
| |
| static const int kCallbackOffset = HeapObject::kHeaderSize; |
| static const int kNamedInterceptorOffset = kCallbackOffset + kPointerSize; |
| static const int kIndexedInterceptorOffset = |
| kNamedInterceptorOffset + kPointerSize; |
| static const int kDataOffset = kIndexedInterceptorOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AccessCheckInfo); |
| }; |
| |
| |
| class InterceptorInfo: public Struct { |
| public: |
| DECL_ACCESSORS(getter, Object) |
| DECL_ACCESSORS(setter, Object) |
| DECL_ACCESSORS(query, Object) |
| DECL_ACCESSORS(descriptor, Object) |
| DECL_ACCESSORS(deleter, Object) |
| DECL_ACCESSORS(enumerator, Object) |
| DECL_ACCESSORS(definer, Object) |
| DECL_ACCESSORS(data, Object) |
| DECL_BOOLEAN_ACCESSORS(can_intercept_symbols) |
| DECL_BOOLEAN_ACCESSORS(all_can_read) |
| DECL_BOOLEAN_ACCESSORS(non_masking) |
| |
| inline int flags() const; |
| inline void set_flags(int flags); |
| |
| DECL_CAST(InterceptorInfo) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(InterceptorInfo) |
| DECL_VERIFIER(InterceptorInfo) |
| |
| static const int kGetterOffset = HeapObject::kHeaderSize; |
| static const int kSetterOffset = kGetterOffset + kPointerSize; |
| static const int kQueryOffset = kSetterOffset + kPointerSize; |
| static const int kDescriptorOffset = kQueryOffset + kPointerSize; |
| static const int kDeleterOffset = kDescriptorOffset + kPointerSize; |
| static const int kEnumeratorOffset = kDeleterOffset + kPointerSize; |
| static const int kDefinerOffset = kEnumeratorOffset + kPointerSize; |
| static const int kDataOffset = kDefinerOffset + kPointerSize; |
| static const int kFlagsOffset = kDataOffset + kPointerSize; |
| static const int kSize = kFlagsOffset + kPointerSize; |
| |
| static const int kCanInterceptSymbolsBit = 0; |
| static const int kAllCanReadBit = 1; |
| static const int kNonMasking = 2; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(InterceptorInfo); |
| }; |
| |
| class CallHandlerInfo : public Tuple2 { |
| public: |
| DECL_ACCESSORS(callback, Object) |
| DECL_ACCESSORS(data, Object) |
| |
| DECL_CAST(CallHandlerInfo) |
| |
| static const int kCallbackOffset = kValue1Offset; |
| static const int kDataOffset = kValue2Offset; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(CallHandlerInfo); |
| }; |
| |
| |
| class TemplateInfo: public Struct { |
| public: |
| DECL_ACCESSORS(tag, Object) |
| DECL_ACCESSORS(serial_number, Object) |
| DECL_INT_ACCESSORS(number_of_properties) |
| DECL_ACCESSORS(property_list, Object) |
| DECL_ACCESSORS(property_accessors, Object) |
| |
| DECL_VERIFIER(TemplateInfo) |
| |
| DECL_CAST(TemplateInfo) |
| |
| static const int kTagOffset = HeapObject::kHeaderSize; |
| static const int kSerialNumberOffset = kTagOffset + kPointerSize; |
| static const int kNumberOfProperties = kSerialNumberOffset + kPointerSize; |
| static const int kPropertyListOffset = kNumberOfProperties + kPointerSize; |
| static const int kPropertyAccessorsOffset = |
| kPropertyListOffset + kPointerSize; |
| static const int kHeaderSize = kPropertyAccessorsOffset + kPointerSize; |
| |
| static const int kFastTemplateInstantiationsCacheSize = 1 * KB; |
| |
| // While we could grow the slow cache until we run out of memory, we put |
| // a limit on it anyway to not crash for embedders that re-create templates |
| // instead of caching them. |
| static const int kSlowTemplateInstantiationsCacheSize = 1 * MB; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(TemplateInfo); |
| }; |
| |
| // See the api-exposed FunctionTemplate for more information. |
| class FunctionTemplateInfo: public TemplateInfo { |
| public: |
| // Handler invoked when calling an instance of this FunctionTemplateInfo. |
| // Either CallInfoHandler or Undefined. |
| DECL_ACCESSORS(call_code, Object) |
| |
| // ObjectTemplateInfo or Undefined, used for the prototype property of the |
| // resulting JSFunction instance of this FunctionTemplate. |
| DECL_ACCESSORS(prototype_template, Object) |
| |
| // In the case the prototype_template is Undefined we use the |
| // protoype_provider_template to retrieve the instance prototype. Either |
| // contains an ObjectTemplateInfo or Undefined. |
| DECL_ACCESSORS(prototype_provider_template, Object) |
| |
| // Used to create protoype chains. The parent_template's prototype is set as |
| // __proto__ of this FunctionTemplate's instance prototype. Is either a |
| // FunctionTemplateInfo or Undefined. |
| DECL_ACCESSORS(parent_template, Object) |
| |
| // Returns an InterceptorInfo or Undefined for named properties. |
| DECL_ACCESSORS(named_property_handler, Object) |
| // Returns an InterceptorInfo or Undefined for indexed properties/elements. |
| DECL_ACCESSORS(indexed_property_handler, Object) |
| |
| // An ObjectTemplateInfo that is used when instantiating the JSFunction |
| // associated with this FunctionTemplateInfo. Contains either an |
| // ObjectTemplateInfo or Undefined. A default instance_template is assigned |
| // upon first instantiation if it's Undefined. |
| DECL_ACCESSORS(instance_template, Object) |
| |
| DECL_ACCESSORS(class_name, Object) |
| |
| // If the signature is a FunctionTemplateInfo it is used to check whether the |
| // receiver calling the associated JSFunction is a compatible receiver, i.e. |
| // it is an instance of the signare FunctionTemplateInfo or any of the |
| // receiver's prototypes are. |
| DECL_ACCESSORS(signature, Object) |
| |
| // Either a CallHandlerInfo or Undefined. If an instance_call_handler is |
| // provided the instances created from the associated JSFunction are marked as |
| // callable. |
| DECL_ACCESSORS(instance_call_handler, Object) |
| |
| DECL_ACCESSORS(access_check_info, Object) |
| DECL_ACCESSORS(shared_function_info, Object) |
| |
| // Internal field to store a flag bitfield. |
| DECL_INT_ACCESSORS(flag) |
| |
| // "length" property of the final JSFunction. |
| DECL_INT_ACCESSORS(length) |
| |
| // Either the_hole or a private symbol. Used to cache the result on |
| // the receiver under the the cached_property_name when this |
| // FunctionTemplateInfo is used as a getter. |
| DECL_ACCESSORS(cached_property_name, Object) |
| |
| // Begin flag bits --------------------- |
| DECL_BOOLEAN_ACCESSORS(hidden_prototype) |
| DECL_BOOLEAN_ACCESSORS(undetectable) |
| |
| // If set, object instances created by this function |
| // requires access check. |
| DECL_BOOLEAN_ACCESSORS(needs_access_check) |
| |
| DECL_BOOLEAN_ACCESSORS(read_only_prototype) |
| |
| // If set, do not create a prototype property for the associated |
| // JSFunction. This bit implies that neither the prototype_template nor the |
| // prototype_provoider_template are instantiated. |
| DECL_BOOLEAN_ACCESSORS(remove_prototype) |
| |
| // If set, do not attach a serial number to this FunctionTemplate and thus do |
| // not keep an instance boilerplate around. |
| DECL_BOOLEAN_ACCESSORS(do_not_cache) |
| |
| // If not set an access may be performed on calling the associated JSFunction. |
| DECL_BOOLEAN_ACCESSORS(accept_any_receiver) |
| // End flag bits --------------------- |
| |
| DECL_CAST(FunctionTemplateInfo) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(FunctionTemplateInfo) |
| DECL_VERIFIER(FunctionTemplateInfo) |
| |
| static const int kInvalidSerialNumber = 0; |
| |
| static const int kCallCodeOffset = TemplateInfo::kHeaderSize; |
| static const int kPrototypeTemplateOffset = |
| kCallCodeOffset + kPointerSize; |
| static const int kPrototypeProviderTemplateOffset = |
| kPrototypeTemplateOffset + kPointerSize; |
| static const int kParentTemplateOffset = |
| kPrototypeProviderTemplateOffset + kPointerSize; |
| static const int kNamedPropertyHandlerOffset = |
| kParentTemplateOffset + kPointerSize; |
| static const int kIndexedPropertyHandlerOffset = |
| kNamedPropertyHandlerOffset + kPointerSize; |
| static const int kInstanceTemplateOffset = |
| kIndexedPropertyHandlerOffset + kPointerSize; |
| static const int kClassNameOffset = kInstanceTemplateOffset + kPointerSize; |
| static const int kSignatureOffset = kClassNameOffset + kPointerSize; |
| static const int kInstanceCallHandlerOffset = kSignatureOffset + kPointerSize; |
| static const int kAccessCheckInfoOffset = |
| kInstanceCallHandlerOffset + kPointerSize; |
| static const int kSharedFunctionInfoOffset = |
| kAccessCheckInfoOffset + kPointerSize; |
| static const int kFlagOffset = kSharedFunctionInfoOffset + kPointerSize; |
| static const int kLengthOffset = kFlagOffset + kPointerSize; |
| static const int kCachedPropertyNameOffset = kLengthOffset + kPointerSize; |
| static const int kSize = kCachedPropertyNameOffset + kPointerSize; |
| |
| static Handle<SharedFunctionInfo> GetOrCreateSharedFunctionInfo( |
| Isolate* isolate, Handle<FunctionTemplateInfo> info, |
| MaybeHandle<Name> maybe_name); |
| // Returns parent function template or null. |
| inline FunctionTemplateInfo* GetParent(Isolate* isolate); |
| // Returns true if |object| is an instance of this function template. |
| inline bool IsTemplateFor(JSObject* object); |
| bool IsTemplateFor(Map* map); |
| inline bool instantiated(); |
| |
| // Helper function for cached accessors. |
| static MaybeHandle<Name> TryGetCachedPropertyName(Isolate* isolate, |
| Handle<Object> getter); |
| |
| private: |
| // Bit position in the flag, from least significant bit position. |
| static const int kHiddenPrototypeBit = 0; |
| static const int kUndetectableBit = 1; |
| static const int kNeedsAccessCheckBit = 2; |
| static const int kReadOnlyPrototypeBit = 3; |
| static const int kRemovePrototypeBit = 4; |
| static const int kDoNotCacheBit = 5; |
| static const int kAcceptAnyReceiver = 6; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FunctionTemplateInfo); |
| }; |
| |
| |
| class ObjectTemplateInfo: public TemplateInfo { |
| public: |
| DECL_ACCESSORS(constructor, Object) |
| DECL_ACCESSORS(data, Object) |
| DECL_INT_ACCESSORS(embedder_field_count) |
| DECL_BOOLEAN_ACCESSORS(immutable_proto) |
| |
| DECL_CAST(ObjectTemplateInfo) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(ObjectTemplateInfo) |
| DECL_VERIFIER(ObjectTemplateInfo) |
| |
| static const int kConstructorOffset = TemplateInfo::kHeaderSize; |
| // LSB is for immutable_proto, higher bits for embedder_field_count |
| static const int kDataOffset = kConstructorOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| // Starting from given object template's constructor walk up the inheritance |
| // chain till a function template that has an instance template is found. |
| inline ObjectTemplateInfo* GetParent(Isolate* isolate); |
| |
| private: |
| class IsImmutablePrototype : public BitField<bool, 0, 1> {}; |
| class EmbedderFieldCount |
| : public BitField<int, IsImmutablePrototype::kNext, 29> {}; |
| }; |
| |
| class StackFrameInfo : public Struct { |
| public: |
| DECL_INT_ACCESSORS(line_number) |
| DECL_INT_ACCESSORS(column_number) |
| DECL_INT_ACCESSORS(script_id) |
| DECL_ACCESSORS(script_name, Object) |
| DECL_ACCESSORS(script_name_or_source_url, Object) |
| DECL_ACCESSORS(function_name, Object) |
| DECL_BOOLEAN_ACCESSORS(is_eval) |
| DECL_BOOLEAN_ACCESSORS(is_constructor) |
| DECL_BOOLEAN_ACCESSORS(is_wasm) |
| DECL_INT_ACCESSORS(flag) |
| DECL_INT_ACCESSORS(id) |
| |
| DECL_CAST(StackFrameInfo) |
| |
| // Dispatched behavior. |
| DECL_PRINTER(StackFrameInfo) |
| DECL_VERIFIER(StackFrameInfo) |
| |
| static const int kLineNumberIndex = Struct::kHeaderSize; |
| static const int kColumnNumberIndex = kLineNumberIndex + kPointerSize; |
| static const int kScriptIdIndex = kColumnNumberIndex + kPointerSize; |
| static const int kScriptNameIndex = kScriptIdIndex + kPointerSize; |
| static const int kScriptNameOrSourceUrlIndex = |
| kScriptNameIndex + kPointerSize; |
| static const int kFunctionNameIndex = |
| kScriptNameOrSourceUrlIndex + kPointerSize; |
| static const int kFlagIndex = kFunctionNameIndex + kPointerSize; |
| static const int kIdIndex = kFlagIndex + kPointerSize; |
| static const int kSize = kIdIndex + kPointerSize; |
| |
| private: |
| // Bit position in the flag, from least significant bit position. |
| static const int kIsEvalBit = 0; |
| static const int kIsConstructorBit = 1; |
| static const int kIsWasmBit = 2; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(StackFrameInfo); |
| }; |
| |
| class SourcePositionTableWithFrameCache : public Tuple2 { |
| public: |
| DECL_ACCESSORS(source_position_table, ByteArray) |
| DECL_ACCESSORS(stack_frame_cache, UnseededNumberDictionary) |
| |
| DECL_CAST(SourcePositionTableWithFrameCache) |
| |
| static const int kSourcePositionTableIndex = Struct::kHeaderSize; |
| static const int kStackFrameCacheIndex = |
| kSourcePositionTableIndex + kPointerSize; |
| static const int kSize = kStackFrameCacheIndex + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SourcePositionTableWithFrameCache); |
| }; |
| |
| // Abstract base class for visiting, and optionally modifying, the |
| // pointers contained in Objects. Used in GC and serialization/deserialization. |
| // TODO(ulan): move to src/visitors.h |
| class ObjectVisitor BASE_EMBEDDED { |
| public: |
| virtual ~ObjectVisitor() {} |
| |
| // Visits a contiguous arrays of pointers in the half-open range |
| // [start, end). Any or all of the values may be modified on return. |
| virtual void VisitPointers(HeapObject* host, Object** start, |
| Object** end) = 0; |
| |
| // Handy shorthand for visiting a single pointer. |
| virtual void VisitPointer(HeapObject* host, Object** p) { |
| VisitPointers(host, p, p + 1); |
| } |
| |
| // Visit weak next_code_link in Code object. |
| virtual void VisitNextCodeLink(Code* host, Object** p) { |
| VisitPointers(host, p, p + 1); |
| } |
| |
| // To allow lazy clearing of inline caches the visitor has |
| // a rich interface for iterating over Code objects.. |
| |
| // Visits a code target in the instruction stream. |
| virtual void VisitCodeTarget(Code* host, RelocInfo* rinfo); |
| |
| // Visits a runtime entry in the instruction stream. |
| virtual void VisitRuntimeEntry(Code* host, RelocInfo* rinfo) {} |
| |
| // Visit pointer embedded into a code object. |
| virtual void VisitEmbeddedPointer(Code* host, RelocInfo* rinfo); |
| |
| // Visits an external reference embedded into a code object. |
| virtual void VisitExternalReference(Code* host, RelocInfo* rinfo) {} |
| |
| // Visits an external reference. |
| virtual void VisitExternalReference(Foreign* host, Address* p) {} |
| |
| // Visits an (encoded) internal reference. |
| virtual void VisitInternalReference(Code* host, RelocInfo* rinfo) {} |
| }; |
| |
| |
| // BooleanBit is a helper class for setting and getting a bit in an integer. |
| class BooleanBit : public AllStatic { |
| public: |
| static inline bool get(int value, int bit_position) { |
| return (value & (1 << bit_position)) != 0; |
| } |
| |
| static inline int set(int value, int bit_position, bool v) { |
| if (v) { |
| value |= (1 << bit_position); |
| } else { |
| value &= ~(1 << bit_position); |
| } |
| return value; |
| } |
| }; |
| |
| |
| } // NOLINT, false-positive due to second-order macros. |
| } // NOLINT, false-positive due to second-order macros. |
| |
| #include "src/objects/object-macros-undef.h" |
| |
| #endif // V8_OBJECTS_H_ |