| // Copyright 2014 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. |
| |
| #include "src/runtime/runtime-utils.h" |
| |
| #include <memory> |
| |
| #include "src/accessors.h" |
| #include "src/arguments.h" |
| #include "src/ast/scopes.h" |
| #include "src/bootstrapper.h" |
| #include "src/deoptimizer.h" |
| #include "src/frames-inl.h" |
| #include "src/isolate-inl.h" |
| #include "src/messages.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| RUNTIME_FUNCTION(Runtime_ThrowConstAssignError) { |
| HandleScope scope(isolate); |
| THROW_NEW_ERROR_RETURN_FAILURE(isolate, |
| NewTypeError(MessageTemplate::kConstAssign)); |
| } |
| |
| namespace { |
| |
| enum class RedeclarationType { kSyntaxError = 0, kTypeError = 1 }; |
| |
| Object* ThrowRedeclarationError(Isolate* isolate, Handle<String> name, |
| RedeclarationType redeclaration_type) { |
| HandleScope scope(isolate); |
| if (redeclaration_type == RedeclarationType::kSyntaxError) { |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewSyntaxError(MessageTemplate::kVarRedeclaration, name)); |
| } else { |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewTypeError(MessageTemplate::kVarRedeclaration, name)); |
| } |
| } |
| |
| |
| // May throw a RedeclarationError. |
| Object* DeclareGlobal( |
| Isolate* isolate, Handle<JSGlobalObject> global, Handle<String> name, |
| Handle<Object> value, PropertyAttributes attr, bool is_var, |
| bool is_function_declaration, RedeclarationType redeclaration_type, |
| Handle<FeedbackVector> feedback_vector = Handle<FeedbackVector>(), |
| FeedbackSlot slot = FeedbackSlot::Invalid()) { |
| Handle<ScriptContextTable> script_contexts( |
| global->native_context()->script_context_table()); |
| ScriptContextTable::LookupResult lookup; |
| if (ScriptContextTable::Lookup(script_contexts, name, &lookup) && |
| IsLexicalVariableMode(lookup.mode)) { |
| // ES#sec-globaldeclarationinstantiation 6.a: |
| // If envRec.HasLexicalDeclaration(name) is true, throw a SyntaxError |
| // exception. |
| return ThrowRedeclarationError(isolate, name, |
| RedeclarationType::kSyntaxError); |
| } |
| |
| // Do the lookup own properties only, see ES5 erratum. |
| LookupIterator::Configuration lookup_config( |
| LookupIterator::Configuration::OWN_SKIP_INTERCEPTOR); |
| if (is_function_declaration) { |
| // For function declarations, use the interceptor on the declaration. For |
| // non-functions, use it only on initialization. |
| lookup_config = LookupIterator::Configuration::OWN; |
| } |
| LookupIterator it(global, name, global, lookup_config); |
| Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it); |
| if (maybe.IsNothing()) return isolate->heap()->exception(); |
| |
| if (it.IsFound()) { |
| PropertyAttributes old_attributes = maybe.FromJust(); |
| // The name was declared before; check for conflicting re-declarations. |
| |
| // Skip var re-declarations. |
| if (is_var) return isolate->heap()->undefined_value(); |
| |
| DCHECK(is_function_declaration); |
| if ((old_attributes & DONT_DELETE) != 0) { |
| // Only allow reconfiguring globals to functions in user code (no |
| // natives, which are marked as read-only). |
| DCHECK_EQ(attr & READ_ONLY, 0); |
| |
| // Check whether we can reconfigure the existing property into a |
| // function. |
| if (old_attributes & READ_ONLY || old_attributes & DONT_ENUM || |
| (it.state() == LookupIterator::ACCESSOR)) { |
| // ECMA-262 section 15.1.11 GlobalDeclarationInstantiation 5.d: |
| // If hasRestrictedGlobal is true, throw a SyntaxError exception. |
| // ECMA-262 section 18.2.1.3 EvalDeclarationInstantiation 8.a.iv.1.b: |
| // If fnDefinable is false, throw a TypeError exception. |
| return ThrowRedeclarationError(isolate, name, redeclaration_type); |
| } |
| // If the existing property is not configurable, keep its attributes. Do |
| attr = old_attributes; |
| } |
| |
| // If the current state is ACCESSOR, this could mean it's an AccessorInfo |
| // type property. We are not allowed to call into such setters during global |
| // function declaration since this would break e.g., onload. Meaning |
| // 'function onload() {}' would invalidly register that function as the |
| // onload callback. To avoid this situation, we first delete the property |
| // before readding it as a regular data property below. |
| if (it.state() == LookupIterator::ACCESSOR) it.Delete(); |
| } |
| |
| if (is_function_declaration) { |
| it.Restart(); |
| } |
| |
| // Define or redefine own property. |
| RETURN_FAILURE_ON_EXCEPTION( |
| isolate, JSObject::DefineOwnPropertyIgnoreAttributes(&it, value, attr)); |
| |
| if (!feedback_vector.is_null() && |
| it.state() != LookupIterator::State::INTERCEPTOR) { |
| DCHECK_EQ(*global, *it.GetHolder<Object>()); |
| // Preinitialize the feedback slot if the global object does not have |
| // named interceptor or the interceptor is not masking. |
| if (!global->HasNamedInterceptor() || |
| global->GetNamedInterceptor()->non_masking()) { |
| LoadGlobalICNexus nexus(feedback_vector, slot); |
| nexus.ConfigurePropertyCellMode(it.GetPropertyCell()); |
| } |
| } |
| return isolate->heap()->undefined_value(); |
| } |
| |
| Object* DeclareGlobals(Isolate* isolate, Handle<FixedArray> declarations, |
| int flags, Handle<FeedbackVector> feedback_vector) { |
| HandleScope scope(isolate); |
| Handle<JSGlobalObject> global(isolate->global_object()); |
| Handle<Context> context(isolate->context()); |
| |
| // Traverse the name/value pairs and set the properties. |
| int length = declarations->length(); |
| FOR_WITH_HANDLE_SCOPE(isolate, int, i = 0, i, i < length, i += 4, { |
| Handle<String> name(String::cast(declarations->get(i)), isolate); |
| FeedbackSlot slot(Smi::ToInt(declarations->get(i + 1))); |
| Handle<Object> possibly_literal_slot(declarations->get(i + 2), isolate); |
| Handle<Object> initial_value(declarations->get(i + 3), isolate); |
| |
| bool is_var = initial_value->IsUndefined(isolate); |
| bool is_function = initial_value->IsSharedFunctionInfo(); |
| DCHECK_EQ(1, BoolToInt(is_var) + BoolToInt(is_function)); |
| |
| Handle<Object> value; |
| if (is_function) { |
| DCHECK(possibly_literal_slot->IsSmi()); |
| // Copy the function and update its context. Use it as value. |
| Handle<SharedFunctionInfo> shared = |
| Handle<SharedFunctionInfo>::cast(initial_value); |
| FeedbackSlot literals_slot(Smi::ToInt(*possibly_literal_slot)); |
| Handle<Cell> literals(Cell::cast(feedback_vector->Get(literals_slot)), |
| isolate); |
| Handle<JSFunction> function = |
| isolate->factory()->NewFunctionFromSharedFunctionInfo( |
| shared, context, literals, TENURED); |
| value = function; |
| } else { |
| value = isolate->factory()->undefined_value(); |
| } |
| |
| // Compute the property attributes. According to ECMA-262, |
| // the property must be non-configurable except in eval. |
| bool is_native = DeclareGlobalsNativeFlag::decode(flags); |
| bool is_eval = DeclareGlobalsEvalFlag::decode(flags); |
| int attr = NONE; |
| if (is_function && is_native) attr |= READ_ONLY; |
| if (!is_eval) attr |= DONT_DELETE; |
| |
| // ES#sec-globaldeclarationinstantiation 5.d: |
| // If hasRestrictedGlobal is true, throw a SyntaxError exception. |
| Object* result = DeclareGlobal( |
| isolate, global, name, value, static_cast<PropertyAttributes>(attr), |
| is_var, is_function, RedeclarationType::kSyntaxError, feedback_vector, |
| slot); |
| if (isolate->has_pending_exception()) return result; |
| }); |
| |
| return isolate->heap()->undefined_value(); |
| } |
| |
| } // namespace |
| |
| RUNTIME_FUNCTION(Runtime_DeclareGlobals) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| |
| CONVERT_ARG_HANDLE_CHECKED(FixedArray, declarations, 0); |
| CONVERT_SMI_ARG_CHECKED(flags, 1); |
| CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, feedback_vector, 2); |
| |
| return DeclareGlobals(isolate, declarations, flags, feedback_vector); |
| } |
| |
| // TODO(ishell): merge this with Runtime::kDeclareGlobals once interpreter |
| // is able to pass feedback vector. |
| RUNTIME_FUNCTION(Runtime_DeclareGlobalsForInterpreter) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| |
| CONVERT_ARG_HANDLE_CHECKED(FixedArray, declarations, 0); |
| CONVERT_SMI_ARG_CHECKED(flags, 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, closure, 2); |
| |
| Handle<FeedbackVector> feedback_vector(closure->feedback_vector(), isolate); |
| return DeclareGlobals(isolate, declarations, flags, feedback_vector); |
| } |
| |
| namespace { |
| |
| Object* DeclareEvalHelper(Isolate* isolate, Handle<String> name, |
| Handle<Object> value) { |
| // Declarations are always made in a function, native, eval, or script |
| // context, or a declaration block scope. Since this is called from eval, the |
| // context passed is the context of the caller, which may be some nested |
| // context and not the declaration context. |
| Handle<Context> context_arg(isolate->context(), isolate); |
| Handle<Context> context(context_arg->declaration_context(), isolate); |
| |
| DCHECK(context->IsFunctionContext() || context->IsNativeContext() || |
| context->IsScriptContext() || context->IsEvalContext() || |
| (context->IsBlockContext() && context->has_extension())); |
| |
| bool is_function = value->IsJSFunction(); |
| bool is_var = !is_function; |
| DCHECK(!is_var || value->IsUndefined(isolate)); |
| |
| int index; |
| PropertyAttributes attributes; |
| InitializationFlag init_flag; |
| VariableMode mode; |
| |
| // Check for a conflict with a lexically scoped variable |
| const ContextLookupFlags lookup_flags = static_cast<ContextLookupFlags>( |
| FOLLOW_CONTEXT_CHAIN | STOP_AT_DECLARATION_SCOPE | SKIP_WITH_CONTEXT); |
| context_arg->Lookup(name, lookup_flags, &index, &attributes, &init_flag, |
| &mode); |
| if (attributes != ABSENT && IsLexicalVariableMode(mode)) { |
| // ES#sec-evaldeclarationinstantiation 5.a.i.1: |
| // If varEnvRec.HasLexicalDeclaration(name) is true, throw a SyntaxError |
| // exception. |
| // ES#sec-evaldeclarationinstantiation 5.d.ii.2.a.i: |
| // Throw a SyntaxError exception. |
| return ThrowRedeclarationError(isolate, name, |
| RedeclarationType::kSyntaxError); |
| } |
| |
| Handle<Object> holder = context->Lookup(name, DONT_FOLLOW_CHAINS, &index, |
| &attributes, &init_flag, &mode); |
| DCHECK(holder.is_null() || !holder->IsModule()); |
| DCHECK(!isolate->has_pending_exception()); |
| |
| Handle<JSObject> object; |
| |
| if (attributes != ABSENT && holder->IsJSGlobalObject()) { |
| // ES#sec-evaldeclarationinstantiation 8.a.iv.1.b: |
| // If fnDefinable is false, throw a TypeError exception. |
| return DeclareGlobal(isolate, Handle<JSGlobalObject>::cast(holder), name, |
| value, NONE, is_var, is_function, |
| RedeclarationType::kTypeError); |
| } |
| if (context_arg->extension()->IsJSGlobalObject()) { |
| Handle<JSGlobalObject> global( |
| JSGlobalObject::cast(context_arg->extension()), isolate); |
| return DeclareGlobal(isolate, global, name, value, NONE, is_var, |
| is_function, RedeclarationType::kTypeError); |
| } else if (context->IsScriptContext()) { |
| DCHECK(context->global_object()->IsJSGlobalObject()); |
| Handle<JSGlobalObject> global( |
| JSGlobalObject::cast(context->global_object()), isolate); |
| return DeclareGlobal(isolate, global, name, value, NONE, is_var, |
| is_function, RedeclarationType::kTypeError); |
| } |
| |
| if (attributes != ABSENT) { |
| DCHECK_EQ(NONE, attributes); |
| |
| // Skip var re-declarations. |
| if (is_var) return isolate->heap()->undefined_value(); |
| |
| DCHECK(is_function); |
| if (index != Context::kNotFound) { |
| DCHECK(holder.is_identical_to(context)); |
| context->set(index, *value); |
| return isolate->heap()->undefined_value(); |
| } |
| |
| object = Handle<JSObject>::cast(holder); |
| |
| } else if (context->has_extension()) { |
| // Sloppy varblock contexts might not have an extension object yet, |
| // in which case their extension is a ScopeInfo. |
| if (context->extension()->IsScopeInfo()) { |
| DCHECK(context->IsBlockContext()); |
| object = isolate->factory()->NewJSObject( |
| isolate->context_extension_function()); |
| Handle<HeapObject> extension = isolate->factory()->NewContextExtension( |
| handle(context->scope_info()), object); |
| context->set_extension(*extension); |
| } else { |
| object = handle(context->extension_object(), isolate); |
| } |
| DCHECK(object->IsJSContextExtensionObject() || object->IsJSGlobalObject()); |
| } else { |
| // Sloppy eval will never have an extension object, as vars are hoisted out, |
| // and lets are known statically. |
| DCHECK(context->IsFunctionContext()); |
| object = |
| isolate->factory()->NewJSObject(isolate->context_extension_function()); |
| context->set_extension(*object); |
| } |
| |
| RETURN_FAILURE_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes( |
| object, name, value, NONE)); |
| |
| return isolate->heap()->undefined_value(); |
| } |
| |
| } // namespace |
| |
| RUNTIME_FUNCTION(Runtime_DeclareEvalFunction) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(2, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| CONVERT_ARG_HANDLE_CHECKED(Object, value, 1); |
| return DeclareEvalHelper(isolate, name, value); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_DeclareEvalVar) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| return DeclareEvalHelper(isolate, name, |
| isolate->factory()->undefined_value()); |
| } |
| |
| namespace { |
| |
| // Find the arguments of the JavaScript function invocation that called |
| // into C++ code. Collect these in a newly allocated array of handles. |
| std::unique_ptr<Handle<Object>[]> GetCallerArguments(Isolate* isolate, |
| int* total_argc) { |
| // Find frame containing arguments passed to the caller. |
| JavaScriptFrameIterator it(isolate); |
| JavaScriptFrame* frame = it.frame(); |
| std::vector<SharedFunctionInfo*> functions; |
| frame->GetFunctions(&functions); |
| if (functions.size() > 1) { |
| int inlined_jsframe_index = static_cast<int>(functions.size()) - 1; |
| TranslatedState translated_values(frame); |
| translated_values.Prepare(frame->fp()); |
| |
| int argument_count = 0; |
| TranslatedFrame* translated_frame = |
| translated_values.GetArgumentsInfoFromJSFrameIndex( |
| inlined_jsframe_index, &argument_count); |
| TranslatedFrame::iterator iter = translated_frame->begin(); |
| |
| // Skip the function. |
| iter++; |
| |
| // Skip the receiver. |
| iter++; |
| argument_count--; |
| |
| *total_argc = argument_count; |
| std::unique_ptr<Handle<Object>[]> param_data( |
| NewArray<Handle<Object>>(*total_argc)); |
| bool should_deoptimize = false; |
| for (int i = 0; i < argument_count; i++) { |
| // If we materialize any object, we should deoptimize the frame because we |
| // might alias an object that was eliminated by escape analysis. |
| should_deoptimize = should_deoptimize || iter->IsMaterializedObject(); |
| Handle<Object> value = iter->GetValue(); |
| param_data[i] = value; |
| iter++; |
| } |
| |
| if (should_deoptimize) { |
| translated_values.StoreMaterializedValuesAndDeopt(frame); |
| } |
| |
| return param_data; |
| } else { |
| if (it.frame()->has_adapted_arguments()) { |
| it.AdvanceOneFrame(); |
| DCHECK(it.frame()->is_arguments_adaptor()); |
| } |
| frame = it.frame(); |
| int args_count = frame->ComputeParametersCount(); |
| |
| *total_argc = args_count; |
| std::unique_ptr<Handle<Object>[]> param_data( |
| NewArray<Handle<Object>>(*total_argc)); |
| for (int i = 0; i < args_count; i++) { |
| Handle<Object> val = Handle<Object>(frame->GetParameter(i), isolate); |
| param_data[i] = val; |
| } |
| return param_data; |
| } |
| } |
| |
| template <typename T> |
| Handle<JSObject> NewSloppyArguments(Isolate* isolate, Handle<JSFunction> callee, |
| T parameters, int argument_count) { |
| CHECK(!IsDerivedConstructor(callee->shared()->kind())); |
| DCHECK(callee->shared()->has_simple_parameters()); |
| Handle<JSObject> result = |
| isolate->factory()->NewArgumentsObject(callee, argument_count); |
| |
| // Allocate the elements if needed. |
| int parameter_count = callee->shared()->internal_formal_parameter_count(); |
| if (argument_count > 0) { |
| if (parameter_count > 0) { |
| int mapped_count = Min(argument_count, parameter_count); |
| Handle<FixedArray> parameter_map = |
| isolate->factory()->NewFixedArray(mapped_count + 2, NOT_TENURED); |
| parameter_map->set_map(isolate->heap()->sloppy_arguments_elements_map()); |
| result->set_map(isolate->native_context()->fast_aliased_arguments_map()); |
| result->set_elements(*parameter_map); |
| |
| // Store the context and the arguments array at the beginning of the |
| // parameter map. |
| Handle<Context> context(isolate->context()); |
| Handle<FixedArray> arguments = |
| isolate->factory()->NewFixedArray(argument_count, NOT_TENURED); |
| parameter_map->set(0, *context); |
| parameter_map->set(1, *arguments); |
| |
| // Loop over the actual parameters backwards. |
| int index = argument_count - 1; |
| while (index >= mapped_count) { |
| // These go directly in the arguments array and have no |
| // corresponding slot in the parameter map. |
| arguments->set(index, parameters[index]); |
| --index; |
| } |
| |
| Handle<ScopeInfo> scope_info(callee->shared()->scope_info()); |
| while (index >= 0) { |
| // Detect duplicate names to the right in the parameter list. |
| Handle<String> name(scope_info->ParameterName(index)); |
| int context_local_count = scope_info->ContextLocalCount(); |
| bool duplicate = false; |
| for (int j = index + 1; j < parameter_count; ++j) { |
| if (scope_info->ParameterName(j) == *name) { |
| duplicate = true; |
| break; |
| } |
| } |
| |
| if (duplicate) { |
| // This goes directly in the arguments array with a hole in the |
| // parameter map. |
| arguments->set(index, parameters[index]); |
| parameter_map->set_the_hole(index + 2); |
| } else { |
| // The context index goes in the parameter map with a hole in the |
| // arguments array. |
| int context_index = -1; |
| for (int j = 0; j < context_local_count; ++j) { |
| if (scope_info->ContextLocalName(j) == *name) { |
| context_index = j; |
| break; |
| } |
| } |
| |
| DCHECK_GE(context_index, 0); |
| arguments->set_the_hole(index); |
| parameter_map->set( |
| index + 2, |
| Smi::FromInt(Context::MIN_CONTEXT_SLOTS + context_index)); |
| } |
| |
| --index; |
| } |
| } else { |
| // If there is no aliasing, the arguments object elements are not |
| // special in any way. |
| Handle<FixedArray> elements = |
| isolate->factory()->NewFixedArray(argument_count, NOT_TENURED); |
| result->set_elements(*elements); |
| for (int i = 0; i < argument_count; ++i) { |
| elements->set(i, parameters[i]); |
| } |
| } |
| } |
| return result; |
| } |
| |
| |
| class HandleArguments BASE_EMBEDDED { |
| public: |
| explicit HandleArguments(Handle<Object>* array) : array_(array) {} |
| Object* operator[](int index) { return *array_[index]; } |
| |
| private: |
| Handle<Object>* array_; |
| }; |
| |
| |
| class ParameterArguments BASE_EMBEDDED { |
| public: |
| explicit ParameterArguments(Object** parameters) : parameters_(parameters) {} |
| Object*& operator[](int index) { return *(parameters_ - index - 1); } |
| |
| private: |
| Object** parameters_; |
| }; |
| |
| } // namespace |
| |
| |
| RUNTIME_FUNCTION(Runtime_NewSloppyArguments_Generic) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0); |
| // This generic runtime function can also be used when the caller has been |
| // inlined, we use the slow but accurate {GetCallerArguments}. |
| int argument_count = 0; |
| std::unique_ptr<Handle<Object>[]> arguments = |
| GetCallerArguments(isolate, &argument_count); |
| HandleArguments argument_getter(arguments.get()); |
| return *NewSloppyArguments(isolate, callee, argument_getter, argument_count); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_NewStrictArguments) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0); |
| // This generic runtime function can also be used when the caller has been |
| // inlined, we use the slow but accurate {GetCallerArguments}. |
| int argument_count = 0; |
| std::unique_ptr<Handle<Object>[]> arguments = |
| GetCallerArguments(isolate, &argument_count); |
| Handle<JSObject> result = |
| isolate->factory()->NewArgumentsObject(callee, argument_count); |
| if (argument_count) { |
| Handle<FixedArray> array = |
| isolate->factory()->NewUninitializedFixedArray(argument_count); |
| DisallowHeapAllocation no_gc; |
| WriteBarrierMode mode = array->GetWriteBarrierMode(no_gc); |
| for (int i = 0; i < argument_count; i++) { |
| array->set(i, *arguments[i], mode); |
| } |
| result->set_elements(*array); |
| } |
| return *result; |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_NewRestParameter) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0) |
| int start_index = callee->shared()->internal_formal_parameter_count(); |
| // This generic runtime function can also be used when the caller has been |
| // inlined, we use the slow but accurate {GetCallerArguments}. |
| int argument_count = 0; |
| std::unique_ptr<Handle<Object>[]> arguments = |
| GetCallerArguments(isolate, &argument_count); |
| int num_elements = std::max(0, argument_count - start_index); |
| Handle<JSObject> result = isolate->factory()->NewJSArray( |
| PACKED_ELEMENTS, num_elements, num_elements, |
| DONT_INITIALIZE_ARRAY_ELEMENTS); |
| { |
| DisallowHeapAllocation no_gc; |
| FixedArray* elements = FixedArray::cast(result->elements()); |
| WriteBarrierMode mode = elements->GetWriteBarrierMode(no_gc); |
| for (int i = 0; i < num_elements; i++) { |
| elements->set(i, *arguments[i + start_index], mode); |
| } |
| } |
| return *result; |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_NewSloppyArguments) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, callee, 0); |
| StackFrameIterator iterator(isolate); |
| |
| // Stub/interpreter handler frame |
| iterator.Advance(); |
| DCHECK(iterator.frame()->type() == StackFrame::STUB); |
| |
| // Function frame |
| iterator.Advance(); |
| JavaScriptFrame* function_frame = JavaScriptFrame::cast(iterator.frame()); |
| DCHECK(function_frame->is_java_script()); |
| int argc = function_frame->ComputeParametersCount(); |
| Address fp = function_frame->fp(); |
| if (function_frame->has_adapted_arguments()) { |
| iterator.Advance(); |
| ArgumentsAdaptorFrame* adaptor_frame = |
| ArgumentsAdaptorFrame::cast(iterator.frame()); |
| argc = adaptor_frame->ComputeParametersCount(); |
| fp = adaptor_frame->fp(); |
| } |
| |
| Object** parameters = reinterpret_cast<Object**>( |
| fp + argc * kPointerSize + StandardFrameConstants::kCallerSPOffset); |
| ParameterArguments argument_getter(parameters); |
| return *NewSloppyArguments(isolate, callee, argument_getter, argc); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_NewArgumentsElements) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| Object** frame = reinterpret_cast<Object**>(args[0]); |
| CONVERT_SMI_ARG_CHECKED(length, 1); |
| CONVERT_SMI_ARG_CHECKED(mapped_count, 2); |
| Handle<FixedArray> result = |
| isolate->factory()->NewUninitializedFixedArray(length); |
| int const offset = length + 1; |
| DisallowHeapAllocation no_gc; |
| WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc); |
| int number_of_holes = Min(mapped_count, length); |
| for (int index = 0; index < number_of_holes; ++index) { |
| result->set_the_hole(isolate, index); |
| } |
| for (int index = number_of_holes; index < length; ++index) { |
| result->set(index, frame[offset - index], mode); |
| } |
| return *result; |
| } |
| |
| RUNTIME_FUNCTION(Runtime_NewClosure) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 0); |
| CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, vector, 1); |
| CONVERT_SMI_ARG_CHECKED(index, 2); |
| Handle<Context> context(isolate->context(), isolate); |
| FeedbackSlot slot = FeedbackVector::ToSlot(index); |
| Handle<Cell> vector_cell(Cell::cast(vector->Get(slot)), isolate); |
| Handle<JSFunction> function = |
| isolate->factory()->NewFunctionFromSharedFunctionInfo( |
| shared, context, vector_cell, NOT_TENURED); |
| return *function; |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_NewClosure_Tenured) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 0); |
| CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, vector, 1); |
| CONVERT_SMI_ARG_CHECKED(index, 2); |
| Handle<Context> context(isolate->context(), isolate); |
| FeedbackSlot slot = FeedbackVector::ToSlot(index); |
| Handle<Cell> vector_cell(Cell::cast(vector->Get(slot)), isolate); |
| // The caller ensures that we pretenure closures that are assigned |
| // directly to properties. |
| Handle<JSFunction> function = |
| isolate->factory()->NewFunctionFromSharedFunctionInfo( |
| shared, context, vector_cell, TENURED); |
| return *function; |
| } |
| |
| static Object* FindNameClash(Handle<ScopeInfo> scope_info, |
| Handle<JSGlobalObject> global_object, |
| Handle<ScriptContextTable> script_context) { |
| Isolate* isolate = scope_info->GetIsolate(); |
| for (int var = 0; var < scope_info->ContextLocalCount(); var++) { |
| Handle<String> name(scope_info->ContextLocalName(var)); |
| VariableMode mode = scope_info->ContextLocalMode(var); |
| ScriptContextTable::LookupResult lookup; |
| if (ScriptContextTable::Lookup(script_context, name, &lookup)) { |
| if (IsLexicalVariableMode(mode) || IsLexicalVariableMode(lookup.mode)) { |
| // ES#sec-globaldeclarationinstantiation 5.b: |
| // If envRec.HasLexicalDeclaration(name) is true, throw a SyntaxError |
| // exception. |
| return ThrowRedeclarationError(isolate, name, |
| RedeclarationType::kSyntaxError); |
| } |
| } |
| |
| if (IsLexicalVariableMode(mode)) { |
| LookupIterator it(global_object, name, global_object, |
| LookupIterator::OWN_SKIP_INTERCEPTOR); |
| Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it); |
| if (maybe.IsNothing()) return isolate->heap()->exception(); |
| if ((maybe.FromJust() & DONT_DELETE) != 0) { |
| // ES#sec-globaldeclarationinstantiation 5.a: |
| // If envRec.HasVarDeclaration(name) is true, throw a SyntaxError |
| // exception. |
| // ES#sec-globaldeclarationinstantiation 5.d: |
| // If hasRestrictedGlobal is true, throw a SyntaxError exception. |
| return ThrowRedeclarationError(isolate, name, |
| RedeclarationType::kSyntaxError); |
| } |
| |
| JSGlobalObject::InvalidatePropertyCell(global_object, name); |
| } |
| } |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_NewScriptContext) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(2, args.length()); |
| |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 1); |
| Handle<JSGlobalObject> global_object(function->context()->global_object()); |
| Handle<Context> native_context(global_object->native_context()); |
| Handle<ScriptContextTable> script_context_table( |
| native_context->script_context_table()); |
| |
| Object* name_clash_result = |
| FindNameClash(scope_info, global_object, script_context_table); |
| if (isolate->has_pending_exception()) return name_clash_result; |
| |
| // Script contexts have a canonical empty function as their closure, not the |
| // anonymous closure containing the global code. See |
| // FullCodeGenerator::PushFunctionArgumentForContextAllocation. |
| Handle<JSFunction> closure(function->shared()->IsUserJavaScript() |
| ? native_context->closure() |
| : *function); |
| |
| // We do not need script contexts here during bootstrap. |
| DCHECK(!isolate->bootstrapper()->IsActive()); |
| Handle<Context> result = |
| isolate->factory()->NewScriptContext(closure, scope_info); |
| |
| DCHECK(function->context() == isolate->context()); |
| DCHECK(*global_object == result->global_object()); |
| |
| Handle<ScriptContextTable> new_script_context_table = |
| ScriptContextTable::Extend(script_context_table, result); |
| native_context->set_script_context_table(*new_script_context_table); |
| return *result; |
| } |
| |
| RUNTIME_FUNCTION(Runtime_NewFunctionContext) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(2, args.length()); |
| |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| CONVERT_SMI_ARG_CHECKED(scope_type, 1); |
| |
| DCHECK(function->context() == isolate->context()); |
| int length = function->shared()->scope_info()->ContextLength(); |
| return *isolate->factory()->NewFunctionContext( |
| length, function, static_cast<ScopeType>(scope_type)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_PushWithContext) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSReceiver, extension_object, 0); |
| CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 2); |
| Handle<Context> current(isolate->context()); |
| Handle<Context> context = isolate->factory()->NewWithContext( |
| function, current, scope_info, extension_object); |
| isolate->set_context(*context); |
| return *context; |
| } |
| |
| RUNTIME_FUNCTION(Runtime_PushModuleContext) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(Module, module, 0); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 1); |
| CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 2); |
| DCHECK(function->context() == isolate->context()); |
| |
| Handle<Context> context = |
| isolate->factory()->NewModuleContext(module, function, scope_info); |
| isolate->set_context(*context); |
| return *context; |
| } |
| |
| RUNTIME_FUNCTION(Runtime_PushCatchContext) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| CONVERT_ARG_HANDLE_CHECKED(Object, thrown_object, 1); |
| CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 2); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 3); |
| Handle<Context> current(isolate->context()); |
| Handle<Context> context = isolate->factory()->NewCatchContext( |
| function, current, scope_info, name, thrown_object); |
| isolate->set_context(*context); |
| return *context; |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_PushBlockContext) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(2, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 0); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 1); |
| Handle<Context> current(isolate->context()); |
| Handle<Context> context = |
| isolate->factory()->NewBlockContext(function, current, scope_info); |
| isolate->set_context(*context); |
| return *context; |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_DeleteLookupSlot) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| |
| int index; |
| PropertyAttributes attributes; |
| InitializationFlag flag; |
| VariableMode mode; |
| Handle<Object> holder = isolate->context()->Lookup( |
| name, FOLLOW_CHAINS, &index, &attributes, &flag, &mode); |
| |
| // If the slot was not found the result is true. |
| if (holder.is_null()) { |
| // In case of JSProxy, an exception might have been thrown. |
| if (isolate->has_pending_exception()) return isolate->heap()->exception(); |
| return isolate->heap()->true_value(); |
| } |
| |
| // If the slot was found in a context or in module imports and exports it |
| // should be DONT_DELETE. |
| if (holder->IsContext() || holder->IsModule()) { |
| return isolate->heap()->false_value(); |
| } |
| |
| // The slot was found in a JSReceiver, either a context extension object, |
| // the global object, or the subject of a with. Try to delete it |
| // (respecting DONT_DELETE). |
| Handle<JSReceiver> object = Handle<JSReceiver>::cast(holder); |
| Maybe<bool> result = JSReceiver::DeleteProperty(object, name); |
| MAYBE_RETURN(result, isolate->heap()->exception()); |
| return isolate->heap()->ToBoolean(result.FromJust()); |
| } |
| |
| |
| namespace { |
| |
| MaybeHandle<Object> LoadLookupSlot(Handle<String> name, |
| ShouldThrow should_throw, |
| Handle<Object>* receiver_return = nullptr) { |
| Isolate* const isolate = name->GetIsolate(); |
| |
| int index; |
| PropertyAttributes attributes; |
| InitializationFlag flag; |
| VariableMode mode; |
| Handle<Object> holder = isolate->context()->Lookup( |
| name, FOLLOW_CHAINS, &index, &attributes, &flag, &mode); |
| if (isolate->has_pending_exception()) return MaybeHandle<Object>(); |
| |
| if (!holder.is_null() && holder->IsModule()) { |
| return Module::LoadVariable(Handle<Module>::cast(holder), index); |
| } |
| if (index != Context::kNotFound) { |
| DCHECK(holder->IsContext()); |
| // If the "property" we were looking for is a local variable, the |
| // receiver is the global object; see ECMA-262, 3rd., 10.1.6 and 10.2.3. |
| Handle<Object> receiver = isolate->factory()->undefined_value(); |
| Handle<Object> value = handle(Context::cast(*holder)->get(index), isolate); |
| // Check for uninitialized bindings. |
| if (flag == kNeedsInitialization && value->IsTheHole(isolate)) { |
| THROW_NEW_ERROR(isolate, |
| NewReferenceError(MessageTemplate::kNotDefined, name), |
| Object); |
| } |
| DCHECK(!value->IsTheHole(isolate)); |
| if (receiver_return) *receiver_return = receiver; |
| return value; |
| } |
| |
| // Otherwise, if the slot was found the holder is a context extension |
| // object, subject of a with, or a global object. We read the named |
| // property from it. |
| if (!holder.is_null()) { |
| // No need to unhole the value here. This is taken care of by the |
| // GetProperty function. |
| Handle<Object> value; |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, value, Object::GetProperty(holder, name), |
| Object); |
| if (receiver_return) { |
| *receiver_return = |
| (holder->IsJSGlobalObject() || holder->IsJSContextExtensionObject()) |
| ? Handle<Object>::cast(isolate->factory()->undefined_value()) |
| : holder; |
| } |
| return value; |
| } |
| |
| if (should_throw == kThrowOnError) { |
| // The property doesn't exist - throw exception. |
| THROW_NEW_ERROR( |
| isolate, NewReferenceError(MessageTemplate::kNotDefined, name), Object); |
| } |
| |
| // The property doesn't exist - return undefined. |
| if (receiver_return) *receiver_return = isolate->factory()->undefined_value(); |
| return isolate->factory()->undefined_value(); |
| } |
| |
| } // namespace |
| |
| |
| RUNTIME_FUNCTION(Runtime_LoadLookupSlot) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| RETURN_RESULT_OR_FAILURE(isolate, LoadLookupSlot(name, kThrowOnError)); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_LoadLookupSlotInsideTypeof) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| RETURN_RESULT_OR_FAILURE(isolate, LoadLookupSlot(name, kDontThrow)); |
| } |
| |
| |
| RUNTIME_FUNCTION_RETURN_PAIR(Runtime_LoadLookupSlotForCall) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(1, args.length()); |
| DCHECK(args[0]->IsString()); |
| Handle<String> name = args.at<String>(0); |
| Handle<Object> value; |
| Handle<Object> receiver; |
| ASSIGN_RETURN_ON_EXCEPTION_VALUE( |
| isolate, value, LoadLookupSlot(name, kThrowOnError, &receiver), |
| MakePair(isolate->heap()->exception(), nullptr)); |
| return MakePair(*value, *receiver); |
| } |
| |
| |
| namespace { |
| |
| MaybeHandle<Object> StoreLookupSlot( |
| Handle<String> name, Handle<Object> value, LanguageMode language_mode, |
| ContextLookupFlags context_lookup_flags = FOLLOW_CHAINS) { |
| Isolate* const isolate = name->GetIsolate(); |
| Handle<Context> context(isolate->context(), isolate); |
| |
| int index; |
| PropertyAttributes attributes; |
| InitializationFlag flag; |
| VariableMode mode; |
| bool is_sloppy_function_name; |
| Handle<Object> holder = |
| context->Lookup(name, context_lookup_flags, &index, &attributes, &flag, |
| &mode, &is_sloppy_function_name); |
| if (holder.is_null()) { |
| // In case of JSProxy, an exception might have been thrown. |
| if (isolate->has_pending_exception()) return MaybeHandle<Object>(); |
| } else if (holder->IsModule()) { |
| if ((attributes & READ_ONLY) == 0) { |
| Module::StoreVariable(Handle<Module>::cast(holder), index, value); |
| } else { |
| THROW_NEW_ERROR( |
| isolate, NewTypeError(MessageTemplate::kConstAssign, name), Object); |
| } |
| return value; |
| } |
| // The property was found in a context slot. |
| if (index != Context::kNotFound) { |
| if (flag == kNeedsInitialization && |
| Handle<Context>::cast(holder)->is_the_hole(isolate, index)) { |
| THROW_NEW_ERROR(isolate, |
| NewReferenceError(MessageTemplate::kNotDefined, name), |
| Object); |
| } |
| if ((attributes & READ_ONLY) == 0) { |
| Handle<Context>::cast(holder)->set(index, *value); |
| } else if (!is_sloppy_function_name || is_strict(language_mode)) { |
| THROW_NEW_ERROR( |
| isolate, NewTypeError(MessageTemplate::kConstAssign, name), Object); |
| } |
| return value; |
| } |
| |
| // Slow case: The property is not in a context slot. It is either in a |
| // context extension object, a property of the subject of a with, or a |
| // property of the global object. |
| Handle<JSReceiver> object; |
| if (attributes != ABSENT) { |
| // The property exists on the holder. |
| object = Handle<JSReceiver>::cast(holder); |
| } else if (is_strict(language_mode)) { |
| // If absent in strict mode: throw. |
| THROW_NEW_ERROR( |
| isolate, NewReferenceError(MessageTemplate::kNotDefined, name), Object); |
| } else { |
| // If absent in sloppy mode: add the property to the global object. |
| object = Handle<JSReceiver>(context->global_object()); |
| } |
| |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, value, Object::SetProperty(object, name, value, language_mode), |
| Object); |
| return value; |
| } |
| |
| } // namespace |
| |
| |
| RUNTIME_FUNCTION(Runtime_StoreLookupSlot_Sloppy) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(2, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| CONVERT_ARG_HANDLE_CHECKED(Object, value, 1); |
| RETURN_RESULT_OR_FAILURE(isolate, |
| StoreLookupSlot(name, value, LanguageMode::kSloppy)); |
| } |
| |
| // Store into a dynamic context for sloppy-mode block-scoped function hoisting |
| // which leaks out of an eval. In particular, with-scopes are be skipped to |
| // reach the appropriate var-like declaration. |
| RUNTIME_FUNCTION(Runtime_StoreLookupSlot_SloppyHoisting) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(2, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| CONVERT_ARG_HANDLE_CHECKED(Object, value, 1); |
| const ContextLookupFlags lookup_flags = static_cast<ContextLookupFlags>( |
| FOLLOW_CONTEXT_CHAIN | STOP_AT_DECLARATION_SCOPE | SKIP_WITH_CONTEXT); |
| RETURN_RESULT_OR_FAILURE( |
| isolate, |
| StoreLookupSlot(name, value, LanguageMode::kSloppy, lookup_flags)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_StoreLookupSlot_Strict) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(2, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(String, name, 0); |
| CONVERT_ARG_HANDLE_CHECKED(Object, value, 1); |
| RETURN_RESULT_OR_FAILURE(isolate, |
| StoreLookupSlot(name, value, LanguageMode::kStrict)); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |