| // Copyright 2012 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_DEOPTIMIZER_DEOPTIMIZER_H_ |
| #define V8_DEOPTIMIZER_DEOPTIMIZER_H_ |
| |
| #include <stack> |
| #include <vector> |
| |
| #include "src/base/macros.h" |
| #include "src/codegen/label.h" |
| #include "src/codegen/register-arch.h" |
| #include "src/codegen/source-position.h" |
| #include "src/common/assert-scope.h" |
| #include "src/common/globals.h" |
| #include "src/deoptimizer/deoptimize-reason.h" |
| #include "src/diagnostics/code-tracer.h" |
| #include "src/execution/frame-constants.h" |
| #include "src/execution/isolate.h" |
| #include "src/heap/heap.h" |
| #include "src/objects/feedback-vector.h" |
| #include "src/objects/js-function.h" |
| #include "src/objects/shared-function-info.h" |
| #include "src/utils/allocation.h" |
| #include "src/utils/boxed-float.h" |
| #include "src/zone/zone-chunk-list.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| class FrameDescription; |
| class JavaScriptFrame; |
| class TranslationIterator; |
| class DeoptimizedFrameInfo; |
| class TranslatedFrame; |
| class TranslatedState; |
| class RegisterValues; |
| class MacroAssembler; |
| class StrongRootsEntry; |
| |
| enum class BuiltinContinuationMode; |
| |
| class TranslatedValue { |
| public: |
| // Allocation-free getter of the value. |
| // Returns ReadOnlyRoots::arguments_marker() if allocation would be necessary |
| // to get the value. In the case of numbers, returns a Smi if possible. |
| Object GetRawValue() const; |
| |
| // Convenience wrapper around GetRawValue (checked). |
| int GetSmiValue() const; |
| |
| // Returns the value, possibly materializing it first (and the whole subgraph |
| // reachable from this value). In the case of numbers, returns a Smi if |
| // possible. |
| Handle<Object> GetValue(); |
| |
| bool IsMaterializedObject() const; |
| bool IsMaterializableByDebugger() const; |
| |
| private: |
| friend class TranslatedState; |
| friend class TranslatedFrame; |
| |
| enum Kind : uint8_t { |
| kInvalid, |
| kTagged, |
| kInt32, |
| kInt64, |
| kUInt32, |
| kBoolBit, |
| kFloat, |
| kDouble, |
| kCapturedObject, // Object captured by the escape analysis. |
| // The number of nested objects can be obtained |
| // with the DeferredObjectLength() method |
| // (the values of the nested objects follow |
| // this value in the depth-first order.) |
| kDuplicatedObject // Duplicated object of a deferred object. |
| }; |
| |
| enum MaterializationState : uint8_t { |
| kUninitialized, |
| kAllocated, // Storage for the object has been allocated (or |
| // enqueued for allocation). |
| kFinished, // The object has been initialized (or enqueued for |
| // initialization). |
| }; |
| |
| TranslatedValue(TranslatedState* container, Kind kind) |
| : kind_(kind), container_(container) {} |
| Kind kind() const { return kind_; } |
| MaterializationState materialization_state() const { |
| return materialization_state_; |
| } |
| void Handlify(); |
| int GetChildrenCount() const; |
| |
| static TranslatedValue NewDeferredObject(TranslatedState* container, |
| int length, int object_index); |
| static TranslatedValue NewDuplicateObject(TranslatedState* container, int id); |
| static TranslatedValue NewFloat(TranslatedState* container, Float32 value); |
| static TranslatedValue NewDouble(TranslatedState* container, Float64 value); |
| static TranslatedValue NewInt32(TranslatedState* container, int32_t value); |
| static TranslatedValue NewInt64(TranslatedState* container, int64_t value); |
| static TranslatedValue NewUInt32(TranslatedState* container, uint32_t value); |
| static TranslatedValue NewBool(TranslatedState* container, uint32_t value); |
| static TranslatedValue NewTagged(TranslatedState* container, Object literal); |
| static TranslatedValue NewInvalid(TranslatedState* container); |
| |
| Isolate* isolate() const; |
| |
| void set_storage(Handle<HeapObject> storage) { storage_ = storage; } |
| void set_initialized_storage(Handle<HeapObject> storage); |
| void mark_finished() { materialization_state_ = kFinished; } |
| void mark_allocated() { materialization_state_ = kAllocated; } |
| |
| Handle<HeapObject> storage() { |
| DCHECK_NE(materialization_state(), kUninitialized); |
| return storage_; |
| } |
| |
| Kind kind_; |
| MaterializationState materialization_state_ = kUninitialized; |
| TranslatedState* container_; // This is only needed for materialization of |
| // objects and constructing handles (to get |
| // to the isolate). |
| |
| Handle<HeapObject> storage_; // Contains the materialized value or the |
| // byte-array that will be later morphed into |
| // the materialized object. |
| |
| struct MaterializedObjectInfo { |
| int id_; |
| int length_; // Applies only to kCapturedObject kinds. |
| }; |
| |
| union { |
| // kind kTagged. After handlification it is always nullptr. |
| Object raw_literal_; |
| // kind is kUInt32 or kBoolBit. |
| uint32_t uint32_value_; |
| // kind is kInt32. |
| int32_t int32_value_; |
| // kind is kInt64. |
| int64_t int64_value_; |
| // kind is kFloat |
| Float32 float_value_; |
| // kind is kDouble |
| Float64 double_value_; |
| // kind is kDuplicatedObject or kCapturedObject. |
| MaterializedObjectInfo materialization_info_; |
| }; |
| |
| // Checked accessors for the union members. |
| Object raw_literal() const; |
| int32_t int32_value() const; |
| int64_t int64_value() const; |
| uint32_t uint32_value() const; |
| Float32 float_value() const; |
| Float64 double_value() const; |
| int object_length() const; |
| int object_index() const; |
| }; |
| |
| class TranslatedFrame { |
| public: |
| enum Kind { |
| kInterpretedFunction, |
| kArgumentsAdaptor, |
| kConstructStub, |
| kBuiltinContinuation, |
| kJavaScriptBuiltinContinuation, |
| kJavaScriptBuiltinContinuationWithCatch, |
| kInvalid |
| }; |
| |
| int GetValueCount(); |
| |
| Kind kind() const { return kind_; } |
| BailoutId node_id() const { return node_id_; } |
| Handle<SharedFunctionInfo> shared_info() const { return shared_info_; } |
| |
| // TODO(jgruber): Simplify/clarify the semantics of this field. The name |
| // `height` is slightly misleading. Yes, this value is related to stack frame |
| // height, but must undergo additional mutations to arrive at the real stack |
| // frame height (e.g.: addition/subtraction of context, accumulator, fixed |
| // frame sizes, padding). |
| int height() const { return height_; } |
| |
| int return_value_offset() const { return return_value_offset_; } |
| int return_value_count() const { return return_value_count_; } |
| |
| SharedFunctionInfo raw_shared_info() const { |
| CHECK(!raw_shared_info_.is_null()); |
| return raw_shared_info_; |
| } |
| |
| class iterator { |
| public: |
| iterator& operator++() { |
| ++input_index_; |
| AdvanceIterator(&position_); |
| return *this; |
| } |
| |
| iterator operator++(int) { |
| iterator original(position_, input_index_); |
| ++input_index_; |
| AdvanceIterator(&position_); |
| return original; |
| } |
| |
| bool operator==(const iterator& other) const { |
| // Ignore {input_index_} for equality. |
| return position_ == other.position_; |
| } |
| bool operator!=(const iterator& other) const { return !(*this == other); } |
| |
| TranslatedValue& operator*() { return (*position_); } |
| TranslatedValue* operator->() { return &(*position_); } |
| const TranslatedValue& operator*() const { return (*position_); } |
| const TranslatedValue* operator->() const { return &(*position_); } |
| |
| int input_index() const { return input_index_; } |
| |
| private: |
| friend TranslatedFrame; |
| |
| explicit iterator(std::deque<TranslatedValue>::iterator position, |
| int input_index = 0) |
| : position_(position), input_index_(input_index) {} |
| |
| std::deque<TranslatedValue>::iterator position_; |
| int input_index_; |
| }; |
| |
| using reference = TranslatedValue&; |
| using const_reference = TranslatedValue const&; |
| |
| iterator begin() { return iterator(values_.begin()); } |
| iterator end() { return iterator(values_.end()); } |
| |
| reference front() { return values_.front(); } |
| const_reference front() const { return values_.front(); } |
| |
| private: |
| friend class TranslatedState; |
| |
| // Constructor static methods. |
| static TranslatedFrame InterpretedFrame(BailoutId bytecode_offset, |
| SharedFunctionInfo shared_info, |
| int height, int return_value_offset, |
| int return_value_count); |
| static TranslatedFrame AccessorFrame(Kind kind, |
| SharedFunctionInfo shared_info); |
| static TranslatedFrame ArgumentsAdaptorFrame(SharedFunctionInfo shared_info, |
| int height); |
| static TranslatedFrame ConstructStubFrame(BailoutId bailout_id, |
| SharedFunctionInfo shared_info, |
| int height); |
| static TranslatedFrame BuiltinContinuationFrame( |
| BailoutId bailout_id, SharedFunctionInfo shared_info, int height); |
| static TranslatedFrame JavaScriptBuiltinContinuationFrame( |
| BailoutId bailout_id, SharedFunctionInfo shared_info, int height); |
| static TranslatedFrame JavaScriptBuiltinContinuationWithCatchFrame( |
| BailoutId bailout_id, SharedFunctionInfo shared_info, int height); |
| static TranslatedFrame InvalidFrame() { |
| return TranslatedFrame(kInvalid, SharedFunctionInfo()); |
| } |
| |
| static void AdvanceIterator(std::deque<TranslatedValue>::iterator* iter); |
| |
| TranslatedFrame(Kind kind, |
| SharedFunctionInfo shared_info = SharedFunctionInfo(), |
| int height = 0, int return_value_offset = 0, |
| int return_value_count = 0) |
| : kind_(kind), |
| node_id_(BailoutId::None()), |
| raw_shared_info_(shared_info), |
| height_(height), |
| return_value_offset_(return_value_offset), |
| return_value_count_(return_value_count) {} |
| |
| void Add(const TranslatedValue& value) { values_.push_back(value); } |
| TranslatedValue* ValueAt(int index) { return &(values_[index]); } |
| void Handlify(); |
| |
| Kind kind_; |
| BailoutId node_id_; |
| SharedFunctionInfo raw_shared_info_; |
| Handle<SharedFunctionInfo> shared_info_; |
| int height_; |
| int return_value_offset_; |
| int return_value_count_; |
| |
| using ValuesContainer = std::deque<TranslatedValue>; |
| |
| ValuesContainer values_; |
| }; |
| |
| // Auxiliary class for translating deoptimization values. |
| // Typical usage sequence: |
| // |
| // 1. Construct the instance. This will involve reading out the translations |
| // and resolving them to values using the supplied frame pointer and |
| // machine state (registers). This phase is guaranteed not to allocate |
| // and not to use any HandleScope. Any object pointers will be stored raw. |
| // |
| // 2. Handlify pointers. This will convert all the raw pointers to handles. |
| // |
| // 3. Reading out the frame values. |
| // |
| // Note: After the instance is constructed, it is possible to iterate over |
| // the values eagerly. |
| |
| class TranslatedState { |
| public: |
| TranslatedState() = default; |
| explicit TranslatedState(const JavaScriptFrame* frame); |
| |
| void Prepare(Address stack_frame_pointer); |
| |
| // Store newly materialized values into the isolate. |
| void StoreMaterializedValuesAndDeopt(JavaScriptFrame* frame); |
| |
| using iterator = std::vector<TranslatedFrame>::iterator; |
| iterator begin() { return frames_.begin(); } |
| iterator end() { return frames_.end(); } |
| |
| using const_iterator = std::vector<TranslatedFrame>::const_iterator; |
| const_iterator begin() const { return frames_.begin(); } |
| const_iterator end() const { return frames_.end(); } |
| |
| std::vector<TranslatedFrame>& frames() { return frames_; } |
| |
| TranslatedFrame* GetFrameFromJSFrameIndex(int jsframe_index); |
| TranslatedFrame* GetArgumentsInfoFromJSFrameIndex(int jsframe_index, |
| int* arguments_count); |
| |
| Isolate* isolate() { return isolate_; } |
| |
| void Init(Isolate* isolate, Address input_frame_pointer, |
| Address stack_frame_pointer, TranslationIterator* iterator, |
| FixedArray literal_array, RegisterValues* registers, |
| FILE* trace_file, int parameter_count, int actual_argument_count); |
| |
| void VerifyMaterializedObjects(); |
| bool DoUpdateFeedback(); |
| |
| private: |
| friend TranslatedValue; |
| |
| TranslatedFrame CreateNextTranslatedFrame(TranslationIterator* iterator, |
| FixedArray literal_array, |
| Address fp, FILE* trace_file); |
| int CreateNextTranslatedValue(int frame_index, TranslationIterator* iterator, |
| FixedArray literal_array, Address fp, |
| RegisterValues* registers, FILE* trace_file); |
| Address DecompressIfNeeded(intptr_t value); |
| Address ComputeArgumentsPosition(Address input_frame_pointer, int* length); |
| void CreateArgumentsElementsTranslatedValues(int frame_index, |
| Address input_frame_pointer, |
| CreateArgumentsType type, |
| FILE* trace_file); |
| |
| void UpdateFromPreviouslyMaterializedObjects(); |
| void MaterializeFixedDoubleArray(TranslatedFrame* frame, int* value_index, |
| TranslatedValue* slot, Handle<Map> map); |
| void MaterializeHeapNumber(TranslatedFrame* frame, int* value_index, |
| TranslatedValue* slot); |
| |
| void EnsureObjectAllocatedAt(TranslatedValue* slot); |
| |
| void SkipSlots(int slots_to_skip, TranslatedFrame* frame, int* value_index); |
| |
| Handle<ByteArray> AllocateStorageFor(TranslatedValue* slot); |
| void EnsureJSObjectAllocated(TranslatedValue* slot, Handle<Map> map); |
| void EnsurePropertiesAllocatedAndMarked(TranslatedValue* properties_slot, |
| Handle<Map> map); |
| void EnsureChildrenAllocated(int count, TranslatedFrame* frame, |
| int* value_index, std::stack<int>* worklist); |
| void EnsureCapturedObjectAllocatedAt(int object_index, |
| std::stack<int>* worklist); |
| Handle<HeapObject> InitializeObjectAt(TranslatedValue* slot); |
| void InitializeCapturedObjectAt(int object_index, std::stack<int>* worklist, |
| const DisallowHeapAllocation& no_allocation); |
| void InitializeJSObjectAt(TranslatedFrame* frame, int* value_index, |
| TranslatedValue* slot, Handle<Map> map, |
| const DisallowHeapAllocation& no_allocation); |
| void InitializeObjectWithTaggedFieldsAt( |
| TranslatedFrame* frame, int* value_index, TranslatedValue* slot, |
| Handle<Map> map, const DisallowHeapAllocation& no_allocation); |
| |
| void ReadUpdateFeedback(TranslationIterator* iterator, |
| FixedArray literal_array, FILE* trace_file); |
| |
| TranslatedValue* ResolveCapturedObject(TranslatedValue* slot); |
| TranslatedValue* GetValueByObjectIndex(int object_index); |
| Handle<Object> GetValueAndAdvance(TranslatedFrame* frame, int* value_index); |
| TranslatedValue* GetResolvedSlot(TranslatedFrame* frame, int value_index); |
| TranslatedValue* GetResolvedSlotAndAdvance(TranslatedFrame* frame, |
| int* value_index); |
| |
| static uint32_t GetUInt32Slot(Address fp, int slot_index); |
| static uint64_t GetUInt64Slot(Address fp, int slot_index); |
| static Float32 GetFloatSlot(Address fp, int slot_index); |
| static Float64 GetDoubleSlot(Address fp, int slot_index); |
| |
| std::vector<TranslatedFrame> frames_; |
| Isolate* isolate_ = nullptr; |
| Address stack_frame_pointer_ = kNullAddress; |
| int formal_parameter_count_; |
| int actual_argument_count_; |
| |
| struct ObjectPosition { |
| int frame_index_; |
| int value_index_; |
| }; |
| std::deque<ObjectPosition> object_positions_; |
| Handle<FeedbackVector> feedback_vector_handle_; |
| FeedbackVector feedback_vector_; |
| FeedbackSlot feedback_slot_; |
| }; |
| |
| class OptimizedFunctionVisitor { |
| public: |
| virtual ~OptimizedFunctionVisitor() = default; |
| virtual void VisitFunction(JSFunction function) = 0; |
| }; |
| |
| class Deoptimizer : public Malloced { |
| public: |
| struct DeoptInfo { |
| DeoptInfo(SourcePosition position, DeoptimizeReason deopt_reason, |
| int deopt_id) |
| : position(position), deopt_reason(deopt_reason), deopt_id(deopt_id) {} |
| |
| SourcePosition position; |
| DeoptimizeReason deopt_reason; |
| int deopt_id; |
| |
| static const int kNoDeoptId = -1; |
| }; |
| |
| static DeoptInfo GetDeoptInfo(Code code, Address from); |
| |
| static int ComputeSourcePositionFromBytecodeArray(SharedFunctionInfo shared, |
| BailoutId node_id); |
| |
| static const char* MessageFor(DeoptimizeKind kind, bool reuse_code); |
| |
| int output_count() const { return output_count_; } |
| |
| Handle<JSFunction> function() const; |
| Handle<Code> compiled_code() const; |
| DeoptimizeKind deopt_kind() const { return deopt_kind_; } |
| |
| // Number of created JS frames. Not all created frames are necessarily JS. |
| int jsframe_count() const { return jsframe_count_; } |
| |
| bool should_reuse_code() const; |
| |
| static Deoptimizer* New(Address raw_function, DeoptimizeKind kind, |
| unsigned bailout_id, Address from, int fp_to_sp_delta, |
| Isolate* isolate); |
| static Deoptimizer* Grab(Isolate* isolate); |
| |
| // The returned object with information on the optimized frame needs to be |
| // freed before another one can be generated. |
| static DeoptimizedFrameInfo* DebuggerInspectableFrame(JavaScriptFrame* frame, |
| int jsframe_index, |
| Isolate* isolate); |
| |
| // Deoptimize the function now. Its current optimized code will never be run |
| // again and any activations of the optimized code will get deoptimized when |
| // execution returns. If {code} is specified then the given code is targeted |
| // instead of the function code (e.g. OSR code not installed on function). |
| static void DeoptimizeFunction(JSFunction function, Code code = Code()); |
| |
| // Deoptimize all code in the given isolate. |
| V8_EXPORT_PRIVATE static void DeoptimizeAll(Isolate* isolate); |
| |
| // Deoptimizes all optimized code that has been previously marked |
| // (via code->set_marked_for_deoptimization) and unlinks all functions that |
| // refer to that code. |
| static void DeoptimizeMarkedCode(Isolate* isolate); |
| |
| // Check the given address against a list of allowed addresses, to prevent a |
| // potential attacker from using the frame creation process in the |
| // deoptimizer, in particular the signing process, to gain control over the |
| // program. |
| // When building mksnapshot, always return false. |
| static bool IsValidReturnAddress(Address address); |
| |
| ~Deoptimizer(); |
| |
| void MaterializeHeapObjects(); |
| |
| static void ComputeOutputFrames(Deoptimizer* deoptimizer); |
| |
| V8_EXPORT_PRIVATE static Builtins::Name GetDeoptimizationEntry( |
| Isolate* isolate, DeoptimizeKind kind); |
| |
| // Returns true if {addr} is a deoptimization entry and stores its type in |
| // {type_out}. Returns false if {addr} is not a deoptimization entry. |
| static bool IsDeoptimizationEntry(Isolate* isolate, Address addr, |
| DeoptimizeKind* type_out); |
| |
| // Code generation support. |
| static int input_offset() { return offsetof(Deoptimizer, input_); } |
| static int output_count_offset() { |
| return offsetof(Deoptimizer, output_count_); |
| } |
| static int output_offset() { return offsetof(Deoptimizer, output_); } |
| |
| static int caller_frame_top_offset() { |
| return offsetof(Deoptimizer, caller_frame_top_); |
| } |
| |
| V8_EXPORT_PRIVATE static int GetDeoptimizedCodeCount(Isolate* isolate); |
| |
| Isolate* isolate() const { return isolate_; } |
| |
| static constexpr int kMaxNumberOfEntries = 16384; |
| |
| // This marker is passed to Deoptimizer::New as {bailout_id} on platforms |
| // that have fixed deopt sizes (see also kSupportsFixedDeoptExitSizes). The |
| // actual deoptimization id is then calculated from the return address. |
| static constexpr unsigned kFixedExitSizeMarker = kMaxUInt32; |
| |
| // Set to true when the architecture supports deoptimization exit sequences |
| // of a fixed size, that can be sorted so that the deoptimization index is |
| // deduced from the address of the deoptimization exit. |
| // TODO(jgruber): Remove this, and support for variable deopt exit sizes, |
| // once all architectures use fixed exit sizes. |
| V8_EXPORT_PRIVATE static const bool kSupportsFixedDeoptExitSizes; |
| |
| // Size of deoptimization exit sequence. This is only meaningful when |
| // kSupportsFixedDeoptExitSizes is true. |
| V8_EXPORT_PRIVATE static const int kNonLazyDeoptExitSize; |
| V8_EXPORT_PRIVATE static const int kLazyDeoptExitSize; |
| |
| // Tracing. |
| static void TraceMarkForDeoptimization(Code code, const char* reason); |
| static void TraceEvictFromOptimizedCodeCache(SharedFunctionInfo sfi, |
| const char* reason); |
| |
| private: |
| friend class FrameWriter; |
| void QueueValueForMaterialization(Address output_address, Object obj, |
| const TranslatedFrame::iterator& iterator); |
| |
| Deoptimizer(Isolate* isolate, JSFunction function, DeoptimizeKind kind, |
| unsigned bailout_id, Address from, int fp_to_sp_delta); |
| Code FindOptimizedCode(); |
| void DeleteFrameDescriptions(); |
| |
| void DoComputeOutputFrames(); |
| void DoComputeInterpretedFrame(TranslatedFrame* translated_frame, |
| int frame_index, bool goto_catch_handler); |
| void DoComputeArgumentsAdaptorFrame(TranslatedFrame* translated_frame, |
| int frame_index); |
| void DoComputeConstructStubFrame(TranslatedFrame* translated_frame, |
| int frame_index); |
| |
| static Builtins::Name TrampolineForBuiltinContinuation( |
| BuiltinContinuationMode mode, bool must_handle_result); |
| |
| void DoComputeBuiltinContinuation(TranslatedFrame* translated_frame, |
| int frame_index, |
| BuiltinContinuationMode mode); |
| |
| unsigned ComputeInputFrameAboveFpFixedSize() const; |
| unsigned ComputeInputFrameSize() const; |
| |
| static unsigned ComputeIncomingArgumentSize(SharedFunctionInfo shared); |
| static unsigned ComputeOutgoingArgumentSize(Code code, unsigned bailout_id); |
| |
| static void MarkAllCodeForContext(NativeContext native_context); |
| static void DeoptimizeMarkedCodeForContext(NativeContext native_context); |
| // Searches the list of known deoptimizing code for a Code object |
| // containing the given address (which is supposedly faster than |
| // searching all code objects). |
| Code FindDeoptimizingCode(Address addr); |
| |
| // Tracing. |
| bool tracing_enabled() const { return static_cast<bool>(trace_scope_); } |
| bool verbose_tracing_enabled() const { |
| return FLAG_trace_deopt_verbose && trace_scope_; |
| } |
| CodeTracer::Scope* trace_scope() const { return trace_scope_.get(); } |
| CodeTracer::Scope* verbose_trace_scope() const { |
| return FLAG_trace_deopt_verbose ? trace_scope() : nullptr; |
| } |
| void TraceDeoptBegin(int optimization_id, int node_id); |
| void TraceDeoptEnd(double deopt_duration); |
| #ifdef DEBUG |
| static void TraceFoundActivation(Isolate* isolate, JSFunction function); |
| #endif |
| static void TraceDeoptAll(Isolate* isolate); |
| static void TraceDeoptMarked(Isolate* isolate); |
| |
| Isolate* isolate_; |
| JSFunction function_; |
| Code compiled_code_; |
| unsigned bailout_id_; |
| DeoptimizeKind deopt_kind_; |
| Address from_; |
| int fp_to_sp_delta_; |
| bool deoptimizing_throw_; |
| int catch_handler_data_; |
| int catch_handler_pc_offset_; |
| |
| // Input frame description. |
| FrameDescription* input_; |
| // Number of output frames. |
| int output_count_; |
| // Number of output js frames. |
| int jsframe_count_; |
| // Array of output frame descriptions. |
| FrameDescription** output_; |
| |
| // Caller frame details computed from input frame. |
| intptr_t caller_frame_top_; |
| intptr_t caller_fp_; |
| intptr_t caller_pc_; |
| intptr_t caller_constant_pool_; |
| intptr_t input_frame_context_; |
| |
| // The argument count of the bottom most frame. |
| int actual_argument_count_; |
| |
| // Key for lookup of previously materialized objects |
| intptr_t stack_fp_; |
| |
| TranslatedState translated_state_; |
| struct ValueToMaterialize { |
| Address output_slot_address_; |
| TranslatedFrame::iterator value_; |
| }; |
| std::vector<ValueToMaterialize> values_to_materialize_; |
| |
| #ifdef DEBUG |
| DisallowGarbageCollection* disallow_garbage_collection_; |
| #endif // DEBUG |
| |
| std::unique_ptr<CodeTracer::Scope> trace_scope_; |
| |
| static const int table_entry_size_; |
| |
| friend class FrameDescription; |
| friend class DeoptimizedFrameInfo; |
| }; |
| |
| class RegisterValues { |
| public: |
| intptr_t GetRegister(unsigned n) const { |
| #if DEBUG |
| // This convoluted DCHECK is needed to work around a gcc problem that |
| // improperly detects an array bounds overflow in optimized debug builds |
| // when using a plain DCHECK. |
| if (n >= arraysize(registers_)) { |
| DCHECK(false); |
| return 0; |
| } |
| #endif |
| return registers_[n]; |
| } |
| |
| Float32 GetFloatRegister(unsigned n) const; |
| |
| Float64 GetDoubleRegister(unsigned n) const { |
| DCHECK(n < arraysize(double_registers_)); |
| return double_registers_[n]; |
| } |
| |
| void SetRegister(unsigned n, intptr_t value) { |
| DCHECK(n < arraysize(registers_)); |
| registers_[n] = value; |
| } |
| |
| intptr_t registers_[Register::kNumRegisters]; |
| // Generated code writes directly into the following array, make sure the |
| // element size matches what the machine instructions expect. |
| static_assert(sizeof(Float64) == kDoubleSize, "size mismatch"); |
| Float64 double_registers_[DoubleRegister::kNumRegisters]; |
| }; |
| |
| class FrameDescription { |
| public: |
| explicit FrameDescription(uint32_t frame_size, int parameter_count = 0); |
| |
| void* operator new(size_t size, uint32_t frame_size) { |
| // Subtracts kSystemPointerSize, as the member frame_content_ already |
| // supplies the first element of the area to store the frame. |
| return malloc(size + frame_size - kSystemPointerSize); |
| } |
| |
| void operator delete(void* pointer, uint32_t frame_size) { free(pointer); } |
| |
| void operator delete(void* description) { free(description); } |
| |
| uint32_t GetFrameSize() const { |
| USE(frame_content_); |
| DCHECK(static_cast<uint32_t>(frame_size_) == frame_size_); |
| return static_cast<uint32_t>(frame_size_); |
| } |
| |
| intptr_t GetFrameSlot(unsigned offset) { |
| return *GetFrameSlotPointer(offset); |
| } |
| |
| unsigned GetLastArgumentSlotOffset(bool pad_arguments = true) { |
| int parameter_slots = parameter_count(); |
| if (pad_arguments && ShouldPadArguments(parameter_slots)) parameter_slots++; |
| return GetFrameSize() - parameter_slots * kSystemPointerSize; |
| } |
| |
| Address GetFramePointerAddress() { |
| #ifdef V8_NO_ARGUMENTS_ADAPTOR |
| // We should not pad arguments in the bottom frame, since this |
| // already contain a padding if necessary and it might contain |
| // extra arguments (actual argument count > parameter count). |
| const bool pad_arguments_bottom_frame = false; |
| #else |
| const bool pad_arguments_bottom_frame = true; |
| #endif |
| int fp_offset = GetLastArgumentSlotOffset(pad_arguments_bottom_frame) - |
| StandardFrameConstants::kCallerSPOffset; |
| return reinterpret_cast<Address>(GetFrameSlotPointer(fp_offset)); |
| } |
| |
| RegisterValues* GetRegisterValues() { return ®ister_values_; } |
| |
| void SetFrameSlot(unsigned offset, intptr_t value) { |
| *GetFrameSlotPointer(offset) = value; |
| } |
| |
| void SetCallerPc(unsigned offset, intptr_t value); |
| |
| void SetCallerFp(unsigned offset, intptr_t value); |
| |
| void SetCallerConstantPool(unsigned offset, intptr_t value); |
| |
| intptr_t GetRegister(unsigned n) const { |
| return register_values_.GetRegister(n); |
| } |
| |
| Float64 GetDoubleRegister(unsigned n) const { |
| return register_values_.GetDoubleRegister(n); |
| } |
| |
| void SetRegister(unsigned n, intptr_t value) { |
| register_values_.SetRegister(n, value); |
| } |
| |
| intptr_t GetTop() const { return top_; } |
| void SetTop(intptr_t top) { top_ = top; } |
| |
| intptr_t GetPc() const { return pc_; } |
| void SetPc(intptr_t pc); |
| |
| intptr_t GetFp() const { return fp_; } |
| void SetFp(intptr_t fp) { fp_ = fp; } |
| |
| intptr_t GetContext() const { return context_; } |
| void SetContext(intptr_t context) { context_ = context; } |
| |
| intptr_t GetConstantPool() const { return constant_pool_; } |
| void SetConstantPool(intptr_t constant_pool) { |
| constant_pool_ = constant_pool; |
| } |
| |
| void SetContinuation(intptr_t pc) { continuation_ = pc; } |
| |
| // Argument count, including receiver. |
| int parameter_count() { return parameter_count_; } |
| |
| static int registers_offset() { |
| return offsetof(FrameDescription, register_values_.registers_); |
| } |
| |
| static constexpr int double_registers_offset() { |
| return offsetof(FrameDescription, register_values_.double_registers_); |
| } |
| |
| static int frame_size_offset() { |
| return offsetof(FrameDescription, frame_size_); |
| } |
| |
| static int pc_offset() { return offsetof(FrameDescription, pc_); } |
| |
| static int continuation_offset() { |
| return offsetof(FrameDescription, continuation_); |
| } |
| |
| static int frame_content_offset() { |
| return offsetof(FrameDescription, frame_content_); |
| } |
| |
| private: |
| static const uint32_t kZapUint32 = 0xbeeddead; |
| |
| // Frame_size_ must hold a uint32_t value. It is only a uintptr_t to |
| // keep the variable-size array frame_content_ of type intptr_t at |
| // the end of the structure aligned. |
| uintptr_t frame_size_; // Number of bytes. |
| int parameter_count_; |
| RegisterValues register_values_; |
| intptr_t top_; |
| intptr_t pc_; |
| intptr_t fp_; |
| intptr_t context_; |
| intptr_t constant_pool_; |
| |
| // Continuation is the PC where the execution continues after |
| // deoptimizing. |
| intptr_t continuation_; |
| |
| // This must be at the end of the object as the object is allocated larger |
| // than its definition indicates to extend this array. |
| intptr_t frame_content_[1]; |
| |
| intptr_t* GetFrameSlotPointer(unsigned offset) { |
| DCHECK(offset < frame_size_); |
| return reinterpret_cast<intptr_t*>(reinterpret_cast<Address>(this) + |
| frame_content_offset() + offset); |
| } |
| }; |
| |
| class TranslationBuffer { |
| public: |
| explicit TranslationBuffer(Zone* zone) : contents_(zone) {} |
| |
| int CurrentIndex() const { return static_cast<int>(contents_.size()); } |
| void Add(int32_t value); |
| |
| Handle<ByteArray> CreateByteArray(Factory* factory); |
| |
| private: |
| ZoneChunkList<uint8_t> contents_; |
| }; |
| |
| class TranslationIterator { |
| public: |
| TranslationIterator(ByteArray buffer, int index); |
| |
| int32_t Next(); |
| |
| bool HasNext() const; |
| |
| void Skip(int n) { |
| for (int i = 0; i < n; i++) Next(); |
| } |
| |
| private: |
| ByteArray buffer_; |
| int index_; |
| }; |
| |
| #define TRANSLATION_OPCODE_LIST(V) \ |
| V(BEGIN) \ |
| V(INTERPRETED_FRAME) \ |
| V(BUILTIN_CONTINUATION_FRAME) \ |
| V(JAVA_SCRIPT_BUILTIN_CONTINUATION_FRAME) \ |
| V(JAVA_SCRIPT_BUILTIN_CONTINUATION_WITH_CATCH_FRAME) \ |
| V(CONSTRUCT_STUB_FRAME) \ |
| V(ARGUMENTS_ADAPTOR_FRAME) \ |
| V(DUPLICATED_OBJECT) \ |
| V(ARGUMENTS_ELEMENTS) \ |
| V(ARGUMENTS_LENGTH) \ |
| V(CAPTURED_OBJECT) \ |
| V(REGISTER) \ |
| V(INT32_REGISTER) \ |
| V(INT64_REGISTER) \ |
| V(UINT32_REGISTER) \ |
| V(BOOL_REGISTER) \ |
| V(FLOAT_REGISTER) \ |
| V(DOUBLE_REGISTER) \ |
| V(STACK_SLOT) \ |
| V(INT32_STACK_SLOT) \ |
| V(INT64_STACK_SLOT) \ |
| V(UINT32_STACK_SLOT) \ |
| V(BOOL_STACK_SLOT) \ |
| V(FLOAT_STACK_SLOT) \ |
| V(DOUBLE_STACK_SLOT) \ |
| V(LITERAL) \ |
| V(UPDATE_FEEDBACK) |
| |
| class Translation { |
| public: |
| #define DECLARE_TRANSLATION_OPCODE_ENUM(item) item, |
| enum Opcode { |
| TRANSLATION_OPCODE_LIST(DECLARE_TRANSLATION_OPCODE_ENUM) LAST = LITERAL |
| }; |
| #undef DECLARE_TRANSLATION_OPCODE_ENUM |
| |
| Translation(TranslationBuffer* buffer, int frame_count, int jsframe_count, |
| int update_feedback_count, Zone* zone) |
| : buffer_(buffer), index_(buffer->CurrentIndex()), zone_(zone) { |
| buffer_->Add(BEGIN); |
| buffer_->Add(frame_count); |
| buffer_->Add(jsframe_count); |
| buffer_->Add(update_feedback_count); |
| } |
| |
| int index() const { return index_; } |
| |
| // Commands. |
| void BeginInterpretedFrame(BailoutId bytecode_offset, int literal_id, |
| unsigned height, int return_value_offset, |
| int return_value_count); |
| void BeginArgumentsAdaptorFrame(int literal_id, unsigned height); |
| void BeginConstructStubFrame(BailoutId bailout_id, int literal_id, |
| unsigned height); |
| void BeginBuiltinContinuationFrame(BailoutId bailout_id, int literal_id, |
| unsigned height); |
| void BeginJavaScriptBuiltinContinuationFrame(BailoutId bailout_id, |
| int literal_id, unsigned height); |
| void BeginJavaScriptBuiltinContinuationWithCatchFrame(BailoutId bailout_id, |
| int literal_id, |
| unsigned height); |
| void ArgumentsElements(CreateArgumentsType type); |
| void ArgumentsLength(); |
| void BeginCapturedObject(int length); |
| void AddUpdateFeedback(int vector_literal, int slot); |
| void DuplicateObject(int object_index); |
| void StoreRegister(Register reg); |
| void StoreInt32Register(Register reg); |
| void StoreInt64Register(Register reg); |
| void StoreUint32Register(Register reg); |
| void StoreBoolRegister(Register reg); |
| void StoreFloatRegister(FloatRegister reg); |
| void StoreDoubleRegister(DoubleRegister reg); |
| void StoreStackSlot(int index); |
| void StoreInt32StackSlot(int index); |
| void StoreInt64StackSlot(int index); |
| void StoreUint32StackSlot(int index); |
| void StoreBoolStackSlot(int index); |
| void StoreFloatStackSlot(int index); |
| void StoreDoubleStackSlot(int index); |
| void StoreLiteral(int literal_id); |
| void StoreJSFrameFunction(); |
| |
| Zone* zone() const { return zone_; } |
| |
| static int NumberOfOperandsFor(Opcode opcode); |
| |
| #if defined(OBJECT_PRINT) || defined(ENABLE_DISASSEMBLER) |
| static const char* StringFor(Opcode opcode); |
| #endif |
| |
| private: |
| TranslationBuffer* buffer_; |
| int index_; |
| Zone* zone_; |
| }; |
| |
| class MaterializedObjectStore { |
| public: |
| explicit MaterializedObjectStore(Isolate* isolate) : isolate_(isolate) {} |
| |
| Handle<FixedArray> Get(Address fp); |
| void Set(Address fp, Handle<FixedArray> materialized_objects); |
| bool Remove(Address fp); |
| |
| private: |
| Isolate* isolate() const { return isolate_; } |
| Handle<FixedArray> GetStackEntries(); |
| Handle<FixedArray> EnsureStackEntries(int size); |
| |
| int StackIdToIndex(Address fp); |
| |
| Isolate* isolate_; |
| std::vector<Address> frame_fps_; |
| }; |
| |
| // Class used to represent an unoptimized frame when the debugger |
| // needs to inspect a frame that is part of an optimized frame. The |
| // internally used FrameDescription objects are not GC safe so for use |
| // by the debugger frame information is copied to an object of this type. |
| // Represents parameters in unadapted form so their number might mismatch |
| // formal parameter count. |
| class DeoptimizedFrameInfo : public Malloced { |
| public: |
| DeoptimizedFrameInfo(TranslatedState* state, |
| TranslatedState::iterator frame_it, Isolate* isolate); |
| |
| // Return the number of incoming arguments. |
| int parameters_count() { return static_cast<int>(parameters_.size()); } |
| |
| // Return the height of the expression stack. |
| int expression_count() { return static_cast<int>(expression_stack_.size()); } |
| |
| // Get the frame function. |
| Handle<JSFunction> GetFunction() { return function_; } |
| |
| // Get the frame context. |
| Handle<Object> GetContext() { return context_; } |
| |
| // Get an incoming argument. |
| Handle<Object> GetParameter(int index) { |
| DCHECK(0 <= index && index < parameters_count()); |
| return parameters_[index]; |
| } |
| |
| // Get an expression from the expression stack. |
| Handle<Object> GetExpression(int index) { |
| DCHECK(0 <= index && index < expression_count()); |
| return expression_stack_[index]; |
| } |
| |
| int GetSourcePosition() { return source_position_; } |
| |
| private: |
| // Set an incoming argument. |
| void SetParameter(int index, Handle<Object> obj) { |
| DCHECK(0 <= index && index < parameters_count()); |
| parameters_[index] = obj; |
| } |
| |
| // Set an expression on the expression stack. |
| void SetExpression(int index, Handle<Object> obj) { |
| DCHECK(0 <= index && index < expression_count()); |
| expression_stack_[index] = obj; |
| } |
| |
| Handle<JSFunction> function_; |
| Handle<Object> context_; |
| std::vector<Handle<Object> > parameters_; |
| std::vector<Handle<Object> > expression_stack_; |
| int source_position_; |
| |
| friend class Deoptimizer; |
| }; |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_DEOPTIMIZER_DEOPTIMIZER_H_ |
