| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_HYDROGEN_H_ |
| #define V8_HYDROGEN_H_ |
| |
| #include "v8.h" |
| |
| #include "allocation.h" |
| #include "ast.h" |
| #include "compiler.h" |
| #include "hydrogen-instructions.h" |
| #include "zone.h" |
| #include "scopes.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Forward declarations. |
| class BitVector; |
| class FunctionState; |
| class HEnvironment; |
| class HGraph; |
| class HLoopInformation; |
| class HTracer; |
| class LAllocator; |
| class LChunk; |
| class LiveRange; |
| |
| |
| class HBasicBlock: public ZoneObject { |
| public: |
| explicit HBasicBlock(HGraph* graph); |
| virtual ~HBasicBlock() { } |
| |
| // Simple accessors. |
| int block_id() const { return block_id_; } |
| void set_block_id(int id) { block_id_ = id; } |
| HGraph* graph() const { return graph_; } |
| Isolate* isolate() const; |
| const ZoneList<HPhi*>* phis() const { return &phis_; } |
| HInstruction* first() const { return first_; } |
| HInstruction* last() const { return last_; } |
| void set_last(HInstruction* instr) { last_ = instr; } |
| HInstruction* GetLastInstruction(); |
| HControlInstruction* end() const { return end_; } |
| HLoopInformation* loop_information() const { return loop_information_; } |
| const ZoneList<HBasicBlock*>* predecessors() const { return &predecessors_; } |
| bool HasPredecessor() const { return predecessors_.length() > 0; } |
| const ZoneList<HBasicBlock*>* dominated_blocks() const { |
| return &dominated_blocks_; |
| } |
| const ZoneList<int>* deleted_phis() const { |
| return &deleted_phis_; |
| } |
| void RecordDeletedPhi(int merge_index) { |
| deleted_phis_.Add(merge_index, zone()); |
| } |
| HBasicBlock* dominator() const { return dominator_; } |
| HEnvironment* last_environment() const { return last_environment_; } |
| int argument_count() const { return argument_count_; } |
| void set_argument_count(int count) { argument_count_ = count; } |
| int first_instruction_index() const { return first_instruction_index_; } |
| void set_first_instruction_index(int index) { |
| first_instruction_index_ = index; |
| } |
| int last_instruction_index() const { return last_instruction_index_; } |
| void set_last_instruction_index(int index) { |
| last_instruction_index_ = index; |
| } |
| bool is_osr_entry() { return is_osr_entry_; } |
| void set_osr_entry() { is_osr_entry_ = true; } |
| |
| void AttachLoopInformation(); |
| void DetachLoopInformation(); |
| bool IsLoopHeader() const { return loop_information() != NULL; } |
| bool IsStartBlock() const { return block_id() == 0; } |
| void PostProcessLoopHeader(IterationStatement* stmt); |
| |
| bool IsFinished() const { return end_ != NULL; } |
| void AddPhi(HPhi* phi); |
| void RemovePhi(HPhi* phi); |
| void AddInstruction(HInstruction* instr); |
| bool Dominates(HBasicBlock* other) const; |
| int LoopNestingDepth() const; |
| |
| void SetInitialEnvironment(HEnvironment* env); |
| void ClearEnvironment() { |
| ASSERT(IsFinished()); |
| ASSERT(end()->SuccessorCount() == 0); |
| last_environment_ = NULL; |
| } |
| bool HasEnvironment() const { return last_environment_ != NULL; } |
| void UpdateEnvironment(HEnvironment* env); |
| HBasicBlock* parent_loop_header() const { return parent_loop_header_; } |
| |
| void set_parent_loop_header(HBasicBlock* block) { |
| ASSERT(parent_loop_header_ == NULL); |
| parent_loop_header_ = block; |
| } |
| |
| bool HasParentLoopHeader() const { return parent_loop_header_ != NULL; } |
| |
| void SetJoinId(BailoutId ast_id); |
| |
| void Finish(HControlInstruction* last); |
| void FinishExit(HControlInstruction* instruction); |
| void Goto(HBasicBlock* block, |
| FunctionState* state = NULL, |
| bool add_simulate = true); |
| void GotoNoSimulate(HBasicBlock* block) { |
| Goto(block, NULL, false); |
| } |
| |
| int PredecessorIndexOf(HBasicBlock* predecessor) const; |
| void AddSimulate(BailoutId ast_id, |
| RemovableSimulate removable = FIXED_SIMULATE) { |
| AddInstruction(CreateSimulate(ast_id, removable)); |
| } |
| void AssignCommonDominator(HBasicBlock* other); |
| void AssignLoopSuccessorDominators(); |
| |
| void FinishExitWithDeoptimization(HDeoptimize::UseEnvironment has_uses) { |
| FinishExit(CreateDeoptimize(has_uses)); |
| } |
| |
| // Add the inlined function exit sequence, adding an HLeaveInlined |
| // instruction and updating the bailout environment. |
| void AddLeaveInlined(HValue* return_value, FunctionState* state); |
| |
| // If a target block is tagged as an inline function return, all |
| // predecessors should contain the inlined exit sequence: |
| // |
| // LeaveInlined |
| // Simulate (caller's environment) |
| // Goto (target block) |
| bool IsInlineReturnTarget() const { return is_inline_return_target_; } |
| void MarkAsInlineReturnTarget(HBasicBlock* inlined_entry_block) { |
| is_inline_return_target_ = true; |
| inlined_entry_block_ = inlined_entry_block; |
| } |
| HBasicBlock* inlined_entry_block() { return inlined_entry_block_; } |
| |
| bool IsDeoptimizing() const { return is_deoptimizing_; } |
| void MarkAsDeoptimizing() { is_deoptimizing_ = true; } |
| |
| bool IsLoopSuccessorDominator() const { |
| return dominates_loop_successors_; |
| } |
| void MarkAsLoopSuccessorDominator() { |
| dominates_loop_successors_ = true; |
| } |
| |
| inline Zone* zone() const; |
| |
| #ifdef DEBUG |
| void Verify(); |
| #endif |
| |
| private: |
| void RegisterPredecessor(HBasicBlock* pred); |
| void AddDominatedBlock(HBasicBlock* block); |
| |
| HSimulate* CreateSimulate(BailoutId ast_id, RemovableSimulate removable); |
| HDeoptimize* CreateDeoptimize(HDeoptimize::UseEnvironment has_uses); |
| |
| int block_id_; |
| HGraph* graph_; |
| ZoneList<HPhi*> phis_; |
| HInstruction* first_; |
| HInstruction* last_; |
| HControlInstruction* end_; |
| HLoopInformation* loop_information_; |
| ZoneList<HBasicBlock*> predecessors_; |
| HBasicBlock* dominator_; |
| ZoneList<HBasicBlock*> dominated_blocks_; |
| HEnvironment* last_environment_; |
| // Outgoing parameter count at block exit, set during lithium translation. |
| int argument_count_; |
| // Instruction indices into the lithium code stream. |
| int first_instruction_index_; |
| int last_instruction_index_; |
| ZoneList<int> deleted_phis_; |
| HBasicBlock* parent_loop_header_; |
| // For blocks marked as inline return target: the block with HEnterInlined. |
| HBasicBlock* inlined_entry_block_; |
| bool is_inline_return_target_ : 1; |
| bool is_deoptimizing_ : 1; |
| bool dominates_loop_successors_ : 1; |
| bool is_osr_entry_ : 1; |
| }; |
| |
| |
| class HPredecessorIterator BASE_EMBEDDED { |
| public: |
| explicit HPredecessorIterator(HBasicBlock* block) |
| : predecessor_list_(block->predecessors()), current_(0) { } |
| |
| bool Done() { return current_ >= predecessor_list_->length(); } |
| HBasicBlock* Current() { return predecessor_list_->at(current_); } |
| void Advance() { current_++; } |
| |
| private: |
| const ZoneList<HBasicBlock*>* predecessor_list_; |
| int current_; |
| }; |
| |
| |
| class HLoopInformation: public ZoneObject { |
| public: |
| HLoopInformation(HBasicBlock* loop_header, Zone* zone) |
| : back_edges_(4, zone), |
| loop_header_(loop_header), |
| blocks_(8, zone), |
| stack_check_(NULL) { |
| blocks_.Add(loop_header, zone); |
| } |
| virtual ~HLoopInformation() {} |
| |
| const ZoneList<HBasicBlock*>* back_edges() const { return &back_edges_; } |
| const ZoneList<HBasicBlock*>* blocks() const { return &blocks_; } |
| HBasicBlock* loop_header() const { return loop_header_; } |
| HBasicBlock* GetLastBackEdge() const; |
| void RegisterBackEdge(HBasicBlock* block); |
| |
| HStackCheck* stack_check() const { return stack_check_; } |
| void set_stack_check(HStackCheck* stack_check) { |
| stack_check_ = stack_check; |
| } |
| |
| private: |
| void AddBlock(HBasicBlock* block); |
| |
| ZoneList<HBasicBlock*> back_edges_; |
| HBasicBlock* loop_header_; |
| ZoneList<HBasicBlock*> blocks_; |
| HStackCheck* stack_check_; |
| }; |
| |
| |
| class BoundsCheckTable; |
| class HGraph: public ZoneObject { |
| public: |
| explicit HGraph(CompilationInfo* info); |
| |
| Isolate* isolate() const { return isolate_; } |
| Zone* zone() const { return zone_; } |
| CompilationInfo* info() const { return info_; } |
| |
| const ZoneList<HBasicBlock*>* blocks() const { return &blocks_; } |
| const ZoneList<HPhi*>* phi_list() const { return phi_list_; } |
| HBasicBlock* entry_block() const { return entry_block_; } |
| HEnvironment* start_environment() const { return start_environment_; } |
| |
| void FinalizeUniqueValueIds(); |
| void InitializeInferredTypes(); |
| void InsertTypeConversions(); |
| void MergeRemovableSimulates(); |
| void InsertRepresentationChanges(); |
| void MarkDeoptimizeOnUndefined(); |
| void ComputeMinusZeroChecks(); |
| void ComputeSafeUint32Operations(); |
| bool ProcessArgumentsObject(); |
| void EliminateRedundantPhis(); |
| void Canonicalize(); |
| void OrderBlocks(); |
| void AssignDominators(); |
| void SetupInformativeDefinitions(); |
| void EliminateRedundantBoundsChecks(); |
| void DehoistSimpleArrayIndexComputations(); |
| void RestoreActualValues(); |
| void DeadCodeElimination(const char *phase_name); |
| void PropagateDeoptimizingMark(); |
| void AnalyzeAndPruneEnvironmentLiveness(); |
| |
| // Returns false if there are phi-uses of the arguments-object |
| // which are not supported by the optimizing compiler. |
| bool CheckArgumentsPhiUses(); |
| |
| // Returns false if there are phi-uses of an uninitialized const |
| // which are not supported by the optimizing compiler. |
| bool CheckConstPhiUses(); |
| |
| void CollectPhis(); |
| |
| void set_undefined_constant(HConstant* constant) { |
| undefined_constant_.set(constant); |
| } |
| HConstant* GetConstantUndefined() const { return undefined_constant_.get(); } |
| HConstant* GetConstant0(); |
| HConstant* GetConstant1(); |
| HConstant* GetConstantMinus1(); |
| HConstant* GetConstantTrue(); |
| HConstant* GetConstantFalse(); |
| HConstant* GetConstantHole(); |
| HConstant* GetConstantNull(); |
| HConstant* GetInvalidContext(); |
| |
| HBasicBlock* CreateBasicBlock(); |
| HArgumentsObject* GetArgumentsObject() const { |
| return arguments_object_.get(); |
| } |
| |
| void SetArgumentsObject(HArgumentsObject* object) { |
| arguments_object_.set(object); |
| } |
| |
| int GetMaximumValueID() const { return values_.length(); } |
| int GetNextBlockID() { return next_block_id_++; } |
| int GetNextValueID(HValue* value) { |
| values_.Add(value, zone()); |
| return values_.length() - 1; |
| } |
| HValue* LookupValue(int id) const { |
| if (id >= 0 && id < values_.length()) return values_[id]; |
| return NULL; |
| } |
| |
| bool Optimize(SmartArrayPointer<char>* bailout_reason); |
| |
| #ifdef DEBUG |
| void Verify(bool do_full_verify) const; |
| #endif |
| |
| bool has_osr_loop_entry() { |
| return osr_loop_entry_.is_set(); |
| } |
| |
| HBasicBlock* osr_loop_entry() { |
| return osr_loop_entry_.get(); |
| } |
| |
| void set_osr_loop_entry(HBasicBlock* entry) { |
| osr_loop_entry_.set(entry); |
| } |
| |
| ZoneList<HUnknownOSRValue*>* osr_values() { |
| return osr_values_.get(); |
| } |
| |
| void set_osr_values(ZoneList<HUnknownOSRValue*>* values) { |
| osr_values_.set(values); |
| } |
| |
| int update_type_change_checksum(int delta) { |
| type_change_checksum_ += delta; |
| return type_change_checksum_; |
| } |
| |
| void update_maximum_environment_size(int environment_size) { |
| if (environment_size > maximum_environment_size_) { |
| maximum_environment_size_ = environment_size; |
| } |
| } |
| int maximum_environment_size() { return maximum_environment_size_; } |
| |
| bool use_optimistic_licm() { |
| return use_optimistic_licm_; |
| } |
| |
| void set_use_optimistic_licm(bool value) { |
| use_optimistic_licm_ = value; |
| } |
| |
| bool has_soft_deoptimize() { |
| return has_soft_deoptimize_; |
| } |
| |
| void set_has_soft_deoptimize(bool value) { |
| has_soft_deoptimize_ = value; |
| } |
| |
| void MarkRecursive() { |
| is_recursive_ = true; |
| } |
| |
| bool is_recursive() const { |
| return is_recursive_; |
| } |
| |
| void MarkDependsOnEmptyArrayProtoElements() { |
| // Add map dependency if not already added. |
| if (depends_on_empty_array_proto_elements_) return; |
| isolate()->initial_object_prototype()->map()->AddDependentCompilationInfo( |
| DependentCode::kElementsCantBeAddedGroup, info()); |
| isolate()->initial_array_prototype()->map()->AddDependentCompilationInfo( |
| DependentCode::kElementsCantBeAddedGroup, info()); |
| depends_on_empty_array_proto_elements_ = true; |
| } |
| |
| bool depends_on_empty_array_proto_elements() { |
| return depends_on_empty_array_proto_elements_; |
| } |
| |
| void RecordUint32Instruction(HInstruction* instr) { |
| if (uint32_instructions_ == NULL) { |
| uint32_instructions_ = new(zone()) ZoneList<HInstruction*>(4, zone()); |
| } |
| uint32_instructions_->Add(instr, zone()); |
| } |
| |
| private: |
| HConstant* GetConstant(SetOncePointer<HConstant>* pointer, |
| int32_t integer_value); |
| |
| template<class Phase> |
| void Run() { |
| Phase phase(this); |
| phase.Run(); |
| } |
| |
| void MarkLive(HValue* ref, HValue* instr, ZoneList<HValue*>* worklist); |
| void MarkLiveInstructions(); |
| void RemoveDeadInstructions(); |
| void MarkAsDeoptimizingRecursively(HBasicBlock* block); |
| void NullifyUnreachableInstructions(); |
| void InsertTypeConversions(HInstruction* instr); |
| void PropagateMinusZeroChecks(HValue* value, BitVector* visited); |
| void RecursivelyMarkPhiDeoptimizeOnUndefined(HPhi* phi); |
| void InsertRepresentationChangeForUse(HValue* value, |
| HValue* use_value, |
| int use_index, |
| Representation to); |
| void InsertRepresentationChangesForValue(HValue* value); |
| void InferTypes(ZoneList<HValue*>* worklist); |
| void InitializeInferredTypes(int from_inclusive, int to_inclusive); |
| void CheckForBackEdge(HBasicBlock* block, HBasicBlock* successor); |
| void SetupInformativeDefinitionsInBlock(HBasicBlock* block); |
| void SetupInformativeDefinitionsRecursively(HBasicBlock* block); |
| void EliminateRedundantBoundsChecks(HBasicBlock* bb, BoundsCheckTable* table); |
| |
| Isolate* isolate_; |
| int next_block_id_; |
| HBasicBlock* entry_block_; |
| HEnvironment* start_environment_; |
| ZoneList<HBasicBlock*> blocks_; |
| ZoneList<HValue*> values_; |
| ZoneList<HPhi*>* phi_list_; |
| ZoneList<HInstruction*>* uint32_instructions_; |
| SetOncePointer<HConstant> undefined_constant_; |
| SetOncePointer<HConstant> constant_0_; |
| SetOncePointer<HConstant> constant_1_; |
| SetOncePointer<HConstant> constant_minus1_; |
| SetOncePointer<HConstant> constant_true_; |
| SetOncePointer<HConstant> constant_false_; |
| SetOncePointer<HConstant> constant_the_hole_; |
| SetOncePointer<HConstant> constant_null_; |
| SetOncePointer<HConstant> constant_invalid_context_; |
| SetOncePointer<HArgumentsObject> arguments_object_; |
| |
| SetOncePointer<HBasicBlock> osr_loop_entry_; |
| SetOncePointer<ZoneList<HUnknownOSRValue*> > osr_values_; |
| |
| CompilationInfo* info_; |
| Zone* zone_; |
| |
| bool is_recursive_; |
| bool use_optimistic_licm_; |
| bool has_soft_deoptimize_; |
| bool depends_on_empty_array_proto_elements_; |
| int type_change_checksum_; |
| int maximum_environment_size_; |
| |
| DISALLOW_COPY_AND_ASSIGN(HGraph); |
| }; |
| |
| |
| Zone* HBasicBlock::zone() const { return graph_->zone(); } |
| |
| |
| // Type of stack frame an environment might refer to. |
| enum FrameType { |
| JS_FUNCTION, |
| JS_CONSTRUCT, |
| JS_GETTER, |
| JS_SETTER, |
| ARGUMENTS_ADAPTOR, |
| STUB |
| }; |
| |
| |
| class HEnvironment: public ZoneObject { |
| public: |
| HEnvironment(HEnvironment* outer, |
| Scope* scope, |
| Handle<JSFunction> closure, |
| Zone* zone); |
| |
| HEnvironment(Zone* zone, int parameter_count); |
| |
| HEnvironment* arguments_environment() { |
| return outer()->frame_type() == ARGUMENTS_ADAPTOR ? outer() : this; |
| } |
| |
| // Simple accessors. |
| Handle<JSFunction> closure() const { return closure_; } |
| const ZoneList<HValue*>* values() const { return &values_; } |
| const GrowableBitVector* assigned_variables() const { |
| return &assigned_variables_; |
| } |
| FrameType frame_type() const { return frame_type_; } |
| int parameter_count() const { return parameter_count_; } |
| int specials_count() const { return specials_count_; } |
| int local_count() const { return local_count_; } |
| HEnvironment* outer() const { return outer_; } |
| int pop_count() const { return pop_count_; } |
| int push_count() const { return push_count_; } |
| |
| BailoutId ast_id() const { return ast_id_; } |
| void set_ast_id(BailoutId id) { ast_id_ = id; } |
| |
| HEnterInlined* entry() const { return entry_; } |
| void set_entry(HEnterInlined* entry) { entry_ = entry; } |
| |
| int length() const { return values_.length(); } |
| bool is_special_index(int i) const { |
| return i >= parameter_count() && i < parameter_count() + specials_count(); |
| } |
| |
| int first_expression_index() const { |
| return parameter_count() + specials_count() + local_count(); |
| } |
| |
| int first_local_index() const { |
| return parameter_count() + specials_count(); |
| } |
| |
| void Bind(Variable* variable, HValue* value) { |
| Bind(IndexFor(variable), value); |
| } |
| |
| void Bind(int index, HValue* value); |
| |
| void BindContext(HValue* value) { |
| Bind(parameter_count(), value); |
| } |
| |
| HValue* Lookup(Variable* variable) const { |
| return Lookup(IndexFor(variable)); |
| } |
| |
| HValue* Lookup(int index) const { |
| HValue* result = values_[index]; |
| ASSERT(result != NULL); |
| return result; |
| } |
| |
| HValue* LookupContext() const { |
| // Return first special. |
| return Lookup(parameter_count()); |
| } |
| |
| void Push(HValue* value) { |
| ASSERT(value != NULL); |
| ++push_count_; |
| values_.Add(value, zone()); |
| } |
| |
| HValue* Pop() { |
| ASSERT(!ExpressionStackIsEmpty()); |
| if (push_count_ > 0) { |
| --push_count_; |
| } else { |
| ++pop_count_; |
| } |
| return values_.RemoveLast(); |
| } |
| |
| void Drop(int count); |
| |
| HValue* Top() const { return ExpressionStackAt(0); } |
| |
| bool ExpressionStackIsEmpty() const; |
| |
| HValue* ExpressionStackAt(int index_from_top) const { |
| int index = length() - index_from_top - 1; |
| ASSERT(HasExpressionAt(index)); |
| return values_[index]; |
| } |
| |
| void SetExpressionStackAt(int index_from_top, HValue* value); |
| |
| HEnvironment* Copy() const; |
| HEnvironment* CopyWithoutHistory() const; |
| HEnvironment* CopyAsLoopHeader(HBasicBlock* block) const; |
| |
| // Create an "inlined version" of this environment, where the original |
| // environment is the outer environment but the top expression stack |
| // elements are moved to an inner environment as parameters. |
| HEnvironment* CopyForInlining(Handle<JSFunction> target, |
| int arguments, |
| FunctionLiteral* function, |
| HConstant* undefined, |
| InliningKind inlining_kind, |
| bool undefined_receiver) const; |
| |
| static bool UseUndefinedReceiver(Handle<JSFunction> closure, |
| FunctionLiteral* function, |
| CallKind call_kind, |
| InliningKind inlining_kind) { |
| return (closure->shared()->native() || !function->is_classic_mode()) && |
| call_kind == CALL_AS_FUNCTION && inlining_kind != CONSTRUCT_CALL_RETURN; |
| } |
| |
| HEnvironment* DiscardInlined(bool drop_extra) { |
| HEnvironment* outer = outer_; |
| while (outer->frame_type() != JS_FUNCTION) outer = outer->outer_; |
| if (drop_extra) outer->Drop(1); |
| return outer; |
| } |
| |
| void AddIncomingEdge(HBasicBlock* block, HEnvironment* other); |
| |
| void ClearHistory() { |
| pop_count_ = 0; |
| push_count_ = 0; |
| assigned_variables_.Clear(); |
| } |
| |
| void SetValueAt(int index, HValue* value) { |
| ASSERT(index < length()); |
| values_[index] = value; |
| } |
| |
| // Map a variable to an environment index. Parameter indices are shifted |
| // by 1 (receiver is parameter index -1 but environment index 0). |
| // Stack-allocated local indices are shifted by the number of parameters. |
| int IndexFor(Variable* variable) const { |
| ASSERT(variable->IsStackAllocated()); |
| int shift = variable->IsParameter() |
| ? 1 |
| : parameter_count_ + specials_count_; |
| return variable->index() + shift; |
| } |
| |
| bool is_local_index(int i) const { |
| return i >= first_local_index() && |
| i < first_expression_index(); |
| } |
| |
| void PrintTo(StringStream* stream); |
| void PrintToStd(); |
| |
| Zone* zone() const { return zone_; } |
| |
| private: |
| HEnvironment(const HEnvironment* other, Zone* zone); |
| |
| HEnvironment(HEnvironment* outer, |
| Handle<JSFunction> closure, |
| FrameType frame_type, |
| int arguments, |
| Zone* zone); |
| |
| // Create an artificial stub environment (e.g. for argument adaptor or |
| // constructor stub). |
| HEnvironment* CreateStubEnvironment(HEnvironment* outer, |
| Handle<JSFunction> target, |
| FrameType frame_type, |
| int arguments) const; |
| |
| // True if index is included in the expression stack part of the environment. |
| bool HasExpressionAt(int index) const; |
| |
| void Initialize(int parameter_count, int local_count, int stack_height); |
| void Initialize(const HEnvironment* other); |
| |
| Handle<JSFunction> closure_; |
| // Value array [parameters] [specials] [locals] [temporaries]. |
| ZoneList<HValue*> values_; |
| GrowableBitVector assigned_variables_; |
| FrameType frame_type_; |
| int parameter_count_; |
| int specials_count_; |
| int local_count_; |
| HEnvironment* outer_; |
| HEnterInlined* entry_; |
| int pop_count_; |
| int push_count_; |
| BailoutId ast_id_; |
| Zone* zone_; |
| }; |
| |
| |
| class HOptimizedGraphBuilder; |
| |
| enum ArgumentsAllowedFlag { |
| ARGUMENTS_NOT_ALLOWED, |
| ARGUMENTS_ALLOWED |
| }; |
| |
| |
| class HIfContinuation; |
| |
| // This class is not BASE_EMBEDDED because our inlining implementation uses |
| // new and delete. |
| class AstContext { |
| public: |
| bool IsEffect() const { return kind_ == Expression::kEffect; } |
| bool IsValue() const { return kind_ == Expression::kValue; } |
| bool IsTest() const { return kind_ == Expression::kTest; } |
| |
| // 'Fill' this context with a hydrogen value. The value is assumed to |
| // have already been inserted in the instruction stream (or not need to |
| // be, e.g., HPhi). Call this function in tail position in the Visit |
| // functions for expressions. |
| virtual void ReturnValue(HValue* value) = 0; |
| |
| // Add a hydrogen instruction to the instruction stream (recording an |
| // environment simulation if necessary) and then fill this context with |
| // the instruction as value. |
| virtual void ReturnInstruction(HInstruction* instr, BailoutId ast_id) = 0; |
| |
| // Finishes the current basic block and materialize a boolean for |
| // value context, nothing for effect, generate a branch for test context. |
| // Call this function in tail position in the Visit functions for |
| // expressions. |
| virtual void ReturnControl(HControlInstruction* instr, BailoutId ast_id) = 0; |
| |
| // Finishes the current basic block and materialize a boolean for |
| // value context, nothing for effect, generate a branch for test context. |
| // Call this function in tail position in the Visit functions for |
| // expressions that use an IfBuilder. |
| virtual void ReturnContinuation(HIfContinuation* continuation, |
| BailoutId ast_id) = 0; |
| |
| void set_for_typeof(bool for_typeof) { for_typeof_ = for_typeof; } |
| bool is_for_typeof() { return for_typeof_; } |
| |
| protected: |
| AstContext(HOptimizedGraphBuilder* owner, Expression::Context kind); |
| virtual ~AstContext(); |
| |
| HOptimizedGraphBuilder* owner() const { return owner_; } |
| |
| inline Zone* zone() const; |
| |
| // We want to be able to assert, in a context-specific way, that the stack |
| // height makes sense when the context is filled. |
| #ifdef DEBUG |
| int original_length_; |
| #endif |
| |
| private: |
| HOptimizedGraphBuilder* owner_; |
| Expression::Context kind_; |
| AstContext* outer_; |
| bool for_typeof_; |
| }; |
| |
| |
| class EffectContext: public AstContext { |
| public: |
| explicit EffectContext(HOptimizedGraphBuilder* owner) |
| : AstContext(owner, Expression::kEffect) { |
| } |
| virtual ~EffectContext(); |
| |
| virtual void ReturnValue(HValue* value); |
| virtual void ReturnInstruction(HInstruction* instr, BailoutId ast_id); |
| virtual void ReturnControl(HControlInstruction* instr, BailoutId ast_id); |
| virtual void ReturnContinuation(HIfContinuation* continuation, |
| BailoutId ast_id); |
| }; |
| |
| |
| class ValueContext: public AstContext { |
| public: |
| ValueContext(HOptimizedGraphBuilder* owner, ArgumentsAllowedFlag flag) |
| : AstContext(owner, Expression::kValue), flag_(flag) { |
| } |
| virtual ~ValueContext(); |
| |
| virtual void ReturnValue(HValue* value); |
| virtual void ReturnInstruction(HInstruction* instr, BailoutId ast_id); |
| virtual void ReturnControl(HControlInstruction* instr, BailoutId ast_id); |
| virtual void ReturnContinuation(HIfContinuation* continuation, |
| BailoutId ast_id); |
| |
| bool arguments_allowed() { return flag_ == ARGUMENTS_ALLOWED; } |
| |
| private: |
| ArgumentsAllowedFlag flag_; |
| }; |
| |
| |
| class TestContext: public AstContext { |
| public: |
| TestContext(HOptimizedGraphBuilder* owner, |
| Expression* condition, |
| HBasicBlock* if_true, |
| HBasicBlock* if_false) |
| : AstContext(owner, Expression::kTest), |
| condition_(condition), |
| if_true_(if_true), |
| if_false_(if_false) { |
| } |
| |
| virtual void ReturnValue(HValue* value); |
| virtual void ReturnInstruction(HInstruction* instr, BailoutId ast_id); |
| virtual void ReturnControl(HControlInstruction* instr, BailoutId ast_id); |
| virtual void ReturnContinuation(HIfContinuation* continuation, |
| BailoutId ast_id); |
| |
| static TestContext* cast(AstContext* context) { |
| ASSERT(context->IsTest()); |
| return reinterpret_cast<TestContext*>(context); |
| } |
| |
| Expression* condition() const { return condition_; } |
| HBasicBlock* if_true() const { return if_true_; } |
| HBasicBlock* if_false() const { return if_false_; } |
| |
| private: |
| // Build the shared core part of the translation unpacking a value into |
| // control flow. |
| void BuildBranch(HValue* value); |
| |
| Expression* condition_; |
| HBasicBlock* if_true_; |
| HBasicBlock* if_false_; |
| }; |
| |
| |
| class FunctionState { |
| public: |
| FunctionState(HOptimizedGraphBuilder* owner, |
| CompilationInfo* info, |
| InliningKind inlining_kind); |
| ~FunctionState(); |
| |
| CompilationInfo* compilation_info() { return compilation_info_; } |
| AstContext* call_context() { return call_context_; } |
| InliningKind inlining_kind() const { return inlining_kind_; } |
| HBasicBlock* function_return() { return function_return_; } |
| TestContext* test_context() { return test_context_; } |
| void ClearInlinedTestContext() { |
| delete test_context_; |
| test_context_ = NULL; |
| } |
| |
| FunctionState* outer() { return outer_; } |
| |
| HEnterInlined* entry() { return entry_; } |
| void set_entry(HEnterInlined* entry) { entry_ = entry; } |
| |
| HArgumentsObject* arguments_object() { return arguments_object_; } |
| void set_arguments_object(HArgumentsObject* arguments_object) { |
| arguments_object_ = arguments_object; |
| } |
| |
| HArgumentsElements* arguments_elements() { return arguments_elements_; } |
| void set_arguments_elements(HArgumentsElements* arguments_elements) { |
| arguments_elements_ = arguments_elements; |
| } |
| |
| bool arguments_pushed() { return arguments_elements() != NULL; } |
| |
| private: |
| HOptimizedGraphBuilder* owner_; |
| |
| CompilationInfo* compilation_info_; |
| |
| // During function inlining, expression context of the call being |
| // inlined. NULL when not inlining. |
| AstContext* call_context_; |
| |
| // The kind of call which is currently being inlined. |
| InliningKind inlining_kind_; |
| |
| // When inlining in an effect or value context, this is the return block. |
| // It is NULL otherwise. When inlining in a test context, there are a |
| // pair of return blocks in the context. When not inlining, there is no |
| // local return point. |
| HBasicBlock* function_return_; |
| |
| // When inlining a call in a test context, a context containing a pair of |
| // return blocks. NULL in all other cases. |
| TestContext* test_context_; |
| |
| // When inlining HEnterInlined instruction corresponding to the function |
| // entry. |
| HEnterInlined* entry_; |
| |
| HArgumentsObject* arguments_object_; |
| HArgumentsElements* arguments_elements_; |
| |
| FunctionState* outer_; |
| }; |
| |
| |
| class HIfContinuation { |
| public: |
| HIfContinuation() { continuation_captured_ = false; } |
| ~HIfContinuation() { ASSERT(!continuation_captured_); } |
| |
| void Capture(HBasicBlock* true_branch, |
| HBasicBlock* false_branch, |
| int position) { |
| ASSERT(!continuation_captured_); |
| true_branch_ = true_branch; |
| false_branch_ = false_branch; |
| position_ = position; |
| continuation_captured_ = true; |
| } |
| |
| void Continue(HBasicBlock** true_branch, |
| HBasicBlock** false_branch, |
| int* position) { |
| ASSERT(continuation_captured_); |
| *true_branch = true_branch_; |
| *false_branch = false_branch_; |
| if (position != NULL) *position = position_; |
| continuation_captured_ = false; |
| } |
| |
| bool IsTrueReachable() { return true_branch_ != NULL; } |
| bool IsFalseReachable() { return false_branch_ != NULL; } |
| bool TrueAndFalseReachable() { |
| return IsTrueReachable() || IsFalseReachable(); |
| } |
| |
| bool continuation_captured_; |
| HBasicBlock* true_branch_; |
| HBasicBlock* false_branch_; |
| int position_; |
| }; |
| |
| |
| class HGraphBuilder { |
| public: |
| explicit HGraphBuilder(CompilationInfo* info) |
| : info_(info), |
| graph_(NULL), |
| current_block_(NULL), |
| no_side_effects_scope_count_(0) {} |
| virtual ~HGraphBuilder() {} |
| |
| HBasicBlock* current_block() const { return current_block_; } |
| void set_current_block(HBasicBlock* block) { current_block_ = block; } |
| HEnvironment* environment() const { |
| return current_block()->last_environment(); |
| } |
| Zone* zone() const { return info_->zone(); } |
| HGraph* graph() const { return graph_; } |
| Isolate* isolate() const { return graph_->isolate(); } |
| CompilationInfo* top_info() { return info_; } |
| |
| HGraph* CreateGraph(); |
| |
| // Bailout environment manipulation. |
| void Push(HValue* value) { environment()->Push(value); } |
| HValue* Pop() { return environment()->Pop(); } |
| |
| // Adding instructions. |
| HInstruction* AddInstruction(HInstruction* instr); |
| |
| template<class I> |
| I* Add() { return static_cast<I*>(AddInstruction(new(zone()) I())); } |
| |
| template<class I, class P1> |
| I* Add(P1 p1) { |
| return static_cast<I*>(AddInstruction(new(zone()) I(p1))); |
| } |
| |
| template<class I, class P1, class P2> |
| I* Add(P1 p1, P2 p2) { |
| return static_cast<I*>(AddInstruction(new(zone()) I(p1, p2))); |
| } |
| |
| template<class I, class P1, class P2, class P3> |
| I* Add(P1 p1, P2 p2, P3 p3) { |
| return static_cast<I*>(AddInstruction(new(zone()) I(p1, p2, p3))); |
| } |
| |
| template<class I, class P1, class P2, class P3, class P4> |
| I* Add(P1 p1, P2 p2, P3 p3, P4 p4) { |
| return static_cast<I*>(AddInstruction(new(zone()) I(p1, p2, p3, p4))); |
| } |
| |
| template<class I, class P1, class P2, class P3, class P4, class P5> |
| I* Add(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) { |
| return static_cast<I*>(AddInstruction(new(zone()) I(p1, p2, p3, p4, p5))); |
| } |
| |
| template<class I, class P1, class P2, class P3, class P4, class P5, class P6> |
| I* Add(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6) { |
| return static_cast<I*>(AddInstruction( |
| new(zone()) I(p1, p2, p3, p4, p5, p6))); |
| } |
| |
| template<class I, class P1, class P2, class P3, |
| class P4, class P5, class P6, class P7> |
| I* Add(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7) { |
| return static_cast<I*>(AddInstruction( |
| new(zone()) I(p1, p2, p3, p4, p5, p6, p7))); |
| } |
| |
| template<class I, class P1, class P2, class P3, class P4, |
| class P5, class P6, class P7, class P8> |
| I* Add(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7, P8 p8) { |
| return static_cast<I*>(AddInstruction( |
| new(zone()) I(p1, p2, p3, p4, p5, p6, p7, p8))); |
| } |
| |
| void AddSimulate(BailoutId id, |
| RemovableSimulate removable = FIXED_SIMULATE); |
| |
| HReturn* AddReturn(HValue* value); |
| |
| void IncrementInNoSideEffectsScope() { |
| no_side_effects_scope_count_++; |
| } |
| |
| void DecrementInNoSideEffectsScope() { |
| no_side_effects_scope_count_--; |
| } |
| |
| protected: |
| virtual bool BuildGraph() = 0; |
| |
| HBasicBlock* CreateBasicBlock(HEnvironment* env); |
| HBasicBlock* CreateLoopHeaderBlock(); |
| |
| HValue* BuildCheckHeapObject(HValue* object); |
| HValue* BuildCheckMap(HValue* obj, Handle<Map> map); |
| |
| // Building common constructs |
| HInstruction* BuildExternalArrayElementAccess( |
| HValue* external_elements, |
| HValue* checked_key, |
| HValue* val, |
| HValue* dependency, |
| ElementsKind elements_kind, |
| bool is_store); |
| |
| HInstruction* BuildFastElementAccess( |
| HValue* elements, |
| HValue* checked_key, |
| HValue* val, |
| HValue* dependency, |
| ElementsKind elements_kind, |
| bool is_store, |
| LoadKeyedHoleMode load_mode, |
| KeyedAccessStoreMode store_mode); |
| |
| HValue* BuildCheckForCapacityGrow(HValue* object, |
| HValue* elements, |
| ElementsKind kind, |
| HValue* length, |
| HValue* key, |
| bool is_js_array); |
| |
| HValue* BuildCopyElementsOnWrite(HValue* object, |
| HValue* elements, |
| ElementsKind kind, |
| HValue* length); |
| |
| HInstruction* BuildUncheckedMonomorphicElementAccess( |
| HValue* object, |
| HValue* key, |
| HValue* val, |
| HCheckMaps* mapcheck, |
| bool is_js_array, |
| ElementsKind elements_kind, |
| bool is_store, |
| LoadKeyedHoleMode load_mode, |
| KeyedAccessStoreMode store_mode); |
| |
| HLoadNamedField* AddLoad( |
| HValue *object, |
| HObjectAccess access, |
| HValue *typecheck = NULL, |
| Representation representation = Representation::Tagged()); |
| |
| HLoadNamedField* BuildLoadNamedField( |
| HValue* object, |
| HObjectAccess access, |
| Representation representation); |
| |
| HStoreNamedField* AddStore( |
| HValue *object, |
| HObjectAccess access, |
| HValue *val, |
| Representation representation = Representation::Tagged()); |
| |
| HStoreNamedField* AddStoreMapConstant(HValue *object, Handle<Map>); |
| |
| HLoadNamedField* AddLoadElements(HValue *object, HValue *typecheck = NULL); |
| |
| class IfBuilder { |
| public: |
| explicit IfBuilder(HGraphBuilder* builder, |
| int position = RelocInfo::kNoPosition); |
| IfBuilder(HGraphBuilder* builder, |
| HIfContinuation* continuation); |
| |
| ~IfBuilder() { |
| if (!finished_) End(); |
| } |
| |
| HInstruction* IfCompare( |
| HValue* left, |
| HValue* right, |
| Token::Value token); |
| |
| HInstruction* IfCompareMap(HValue* left, Handle<Map> map); |
| |
| template<class Condition> |
| HInstruction* If(HValue *p) { |
| HControlInstruction* compare = new(zone()) Condition(p); |
| AddCompare(compare); |
| return compare; |
| } |
| |
| template<class Condition, class P2> |
| HInstruction* If(HValue* p1, P2 p2) { |
| HControlInstruction* compare = new(zone()) Condition(p1, p2); |
| AddCompare(compare); |
| return compare; |
| } |
| |
| template<class Condition, class P2> |
| HInstruction* IfNot(HValue* p1, P2 p2) { |
| HControlInstruction* compare = new(zone()) Condition(p1, p2); |
| AddCompare(compare); |
| HBasicBlock* block0 = compare->SuccessorAt(0); |
| HBasicBlock* block1 = compare->SuccessorAt(1); |
| compare->SetSuccessorAt(0, block1); |
| compare->SetSuccessorAt(1, block0); |
| return compare; |
| } |
| |
| HInstruction* OrIfCompare( |
| HValue* p1, |
| HValue* p2, |
| Token::Value token) { |
| Or(); |
| return IfCompare(p1, p2, token); |
| } |
| |
| HInstruction* OrIfCompareMap(HValue* left, Handle<Map> map) { |
| Or(); |
| return IfCompareMap(left, map); |
| } |
| |
| template<class Condition> |
| HInstruction* OrIf(HValue *p) { |
| Or(); |
| return If<Condition>(p); |
| } |
| |
| template<class Condition, class P2> |
| HInstruction* OrIf(HValue* p1, P2 p2) { |
| Or(); |
| return If<Condition>(p1, p2); |
| } |
| |
| HInstruction* AndIfCompare( |
| HValue* p1, |
| HValue* p2, |
| Token::Value token) { |
| And(); |
| return IfCompare(p1, p2, token); |
| } |
| |
| HInstruction* AndIfCompareMap(HValue* left, Handle<Map> map) { |
| And(); |
| return IfCompareMap(left, map); |
| } |
| |
| template<class Condition> |
| HInstruction* AndIf(HValue *p) { |
| And(); |
| return If<Condition>(p); |
| } |
| |
| template<class Condition, class P2> |
| HInstruction* AndIf(HValue* p1, P2 p2) { |
| And(); |
| return If<Condition>(p1, p2); |
| } |
| |
| void Or(); |
| void And(); |
| |
| void CaptureContinuation(HIfContinuation* continuation); |
| |
| void Then(); |
| void Else(); |
| void End(); |
| |
| void Deopt(); |
| void ElseDeopt() { |
| Else(); |
| Deopt(); |
| End(); |
| } |
| |
| void Return(HValue* value); |
| |
| private: |
| void AddCompare(HControlInstruction* compare); |
| |
| Zone* zone() { return builder_->zone(); } |
| |
| HGraphBuilder* builder_; |
| int position_; |
| bool finished_ : 1; |
| bool did_then_ : 1; |
| bool did_else_ : 1; |
| bool did_and_ : 1; |
| bool did_or_ : 1; |
| bool captured_ : 1; |
| bool needs_compare_ : 1; |
| HBasicBlock* first_true_block_; |
| HBasicBlock* last_true_block_; |
| HBasicBlock* first_false_block_; |
| HBasicBlock* split_edge_merge_block_; |
| HBasicBlock* merge_block_; |
| }; |
| |
| class LoopBuilder { |
| public: |
| enum Direction { |
| kPreIncrement, |
| kPostIncrement, |
| kPreDecrement, |
| kPostDecrement |
| }; |
| |
| LoopBuilder(HGraphBuilder* builder, |
| HValue* context, |
| Direction direction); |
| ~LoopBuilder() { |
| ASSERT(finished_); |
| } |
| |
| HValue* BeginBody( |
| HValue* initial, |
| HValue* terminating, |
| Token::Value token); |
| void EndBody(); |
| |
| private: |
| Zone* zone() { return builder_->zone(); } |
| |
| HGraphBuilder* builder_; |
| HValue* context_; |
| HInstruction* increment_; |
| HPhi* phi_; |
| HBasicBlock* header_block_; |
| HBasicBlock* body_block_; |
| HBasicBlock* exit_block_; |
| Direction direction_; |
| bool finished_; |
| }; |
| |
| class NoObservableSideEffectsScope { |
| public: |
| explicit NoObservableSideEffectsScope(HGraphBuilder* builder) : |
| builder_(builder) { |
| builder_->IncrementInNoSideEffectsScope(); |
| } |
| ~NoObservableSideEffectsScope() { |
| builder_->DecrementInNoSideEffectsScope(); |
| } |
| |
| private: |
| HGraphBuilder* builder_; |
| }; |
| |
| HValue* BuildNewElementsCapacity(HValue* context, |
| HValue* old_capacity); |
| |
| void BuildNewSpaceArrayCheck(HValue* length, |
| ElementsKind kind); |
| |
| class JSArrayBuilder { |
| public: |
| JSArrayBuilder(HGraphBuilder* builder, |
| ElementsKind kind, |
| HValue* allocation_site_payload, |
| HValue* constructor_function, |
| AllocationSiteOverrideMode override_mode); |
| |
| JSArrayBuilder(HGraphBuilder* builder, |
| ElementsKind kind, |
| HValue* constructor_function); |
| |
| HValue* AllocateEmptyArray(); |
| HValue* AllocateArray(HValue* capacity, HValue* length_field, |
| bool fill_with_hole); |
| HValue* GetElementsLocation() { return elements_location_; } |
| |
| private: |
| Zone* zone() const { return builder_->zone(); } |
| int elements_size() const { |
| return IsFastDoubleElementsKind(kind_) ? kDoubleSize : kPointerSize; |
| } |
| HGraphBuilder* builder() { return builder_; } |
| HGraph* graph() { return builder_->graph(); } |
| int initial_capacity() { |
| STATIC_ASSERT(JSArray::kPreallocatedArrayElements > 0); |
| return JSArray::kPreallocatedArrayElements; |
| } |
| |
| HValue* EmitMapCode(HValue* context); |
| HValue* EmitInternalMapCode(); |
| HValue* EstablishEmptyArrayAllocationSize(); |
| HValue* EstablishAllocationSize(HValue* length_node); |
| HValue* AllocateArray(HValue* size_in_bytes, HValue* capacity, |
| HValue* length_field, bool fill_with_hole); |
| |
| HGraphBuilder* builder_; |
| ElementsKind kind_; |
| AllocationSiteMode mode_; |
| HValue* allocation_site_payload_; |
| HValue* constructor_function_; |
| HInnerAllocatedObject* elements_location_; |
| }; |
| |
| HValue* BuildAllocateElements(HValue* context, |
| ElementsKind kind, |
| HValue* capacity); |
| |
| void BuildInitializeElementsHeader(HValue* elements, |
| ElementsKind kind, |
| HValue* capacity); |
| |
| HValue* BuildAllocateElementsAndInitializeElementsHeader(HValue* context, |
| ElementsKind kind, |
| HValue* capacity); |
| |
| // array must have been allocated with enough room for |
| // 1) the JSArray, 2) a AllocationSiteInfo if mode requires it, |
| // 3) a FixedArray or FixedDoubleArray. |
| // A pointer to the Fixed(Double)Array is returned. |
| HInnerAllocatedObject* BuildJSArrayHeader(HValue* array, |
| HValue* array_map, |
| AllocationSiteMode mode, |
| HValue* allocation_site_payload, |
| HValue* length_field); |
| |
| HValue* BuildGrowElementsCapacity(HValue* object, |
| HValue* elements, |
| ElementsKind kind, |
| HValue* length, |
| HValue* new_capacity); |
| |
| void BuildFillElementsWithHole(HValue* context, |
| HValue* elements, |
| ElementsKind elements_kind, |
| HValue* from, |
| HValue* to); |
| |
| void BuildCopyElements(HValue* context, |
| HValue* from_elements, |
| ElementsKind from_elements_kind, |
| HValue* to_elements, |
| ElementsKind to_elements_kind, |
| HValue* length, |
| HValue* capacity); |
| |
| HValue* BuildCloneShallowArray(HContext* context, |
| HValue* boilerplate, |
| AllocationSiteMode mode, |
| ElementsKind kind, |
| int length); |
| |
| void BuildCompareNil( |
| HValue* value, |
| Handle<Type> type, |
| int position, |
| HIfContinuation* continuation); |
| |
| HValue* BuildCreateAllocationSiteInfo(HValue* previous_object, |
| int previous_object_size, |
| HValue* payload); |
| |
| HInstruction* BuildGetNativeContext(HValue* context); |
| HInstruction* BuildGetArrayFunction(HValue* context); |
| |
| private: |
| HGraphBuilder(); |
| CompilationInfo* info_; |
| HGraph* graph_; |
| HBasicBlock* current_block_; |
| int no_side_effects_scope_count_; |
| }; |
| |
| |
| class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor { |
| public: |
| // A class encapsulating (lazily-allocated) break and continue blocks for |
| // a breakable statement. Separated from BreakAndContinueScope so that it |
| // can have a separate lifetime. |
| class BreakAndContinueInfo BASE_EMBEDDED { |
| public: |
| explicit BreakAndContinueInfo(BreakableStatement* target, |
| int drop_extra = 0) |
| : target_(target), |
| break_block_(NULL), |
| continue_block_(NULL), |
| drop_extra_(drop_extra) { |
| } |
| |
| BreakableStatement* target() { return target_; } |
| HBasicBlock* break_block() { return break_block_; } |
| void set_break_block(HBasicBlock* block) { break_block_ = block; } |
| HBasicBlock* continue_block() { return continue_block_; } |
| void set_continue_block(HBasicBlock* block) { continue_block_ = block; } |
| int drop_extra() { return drop_extra_; } |
| |
| private: |
| BreakableStatement* target_; |
| HBasicBlock* break_block_; |
| HBasicBlock* continue_block_; |
| int drop_extra_; |
| }; |
| |
| // A helper class to maintain a stack of current BreakAndContinueInfo |
| // structures mirroring BreakableStatement nesting. |
| class BreakAndContinueScope BASE_EMBEDDED { |
| public: |
| BreakAndContinueScope(BreakAndContinueInfo* info, |
| HOptimizedGraphBuilder* owner) |
| : info_(info), owner_(owner), next_(owner->break_scope()) { |
| owner->set_break_scope(this); |
| } |
| |
| ~BreakAndContinueScope() { owner_->set_break_scope(next_); } |
| |
| BreakAndContinueInfo* info() { return info_; } |
| HOptimizedGraphBuilder* owner() { return owner_; } |
| BreakAndContinueScope* next() { return next_; } |
| |
| // Search the break stack for a break or continue target. |
| enum BreakType { BREAK, CONTINUE }; |
| HBasicBlock* Get(BreakableStatement* stmt, BreakType type, int* drop_extra); |
| |
| private: |
| BreakAndContinueInfo* info_; |
| HOptimizedGraphBuilder* owner_; |
| BreakAndContinueScope* next_; |
| }; |
| |
| explicit HOptimizedGraphBuilder(CompilationInfo* info); |
| |
| virtual bool BuildGraph(); |
| |
| // Simple accessors. |
| BreakAndContinueScope* break_scope() const { return break_scope_; } |
| void set_break_scope(BreakAndContinueScope* head) { break_scope_ = head; } |
| |
| bool inline_bailout() { return inline_bailout_; } |
| |
| void AddSoftDeoptimize(); |
| |
| void Bailout(const char* reason); |
| |
| HBasicBlock* CreateJoin(HBasicBlock* first, |
| HBasicBlock* second, |
| BailoutId join_id); |
| |
| FunctionState* function_state() const { return function_state_; } |
| |
| void VisitDeclarations(ZoneList<Declaration*>* declarations); |
| |
| void* operator new(size_t size, Zone* zone) { |
| return zone->New(static_cast<int>(size)); |
| } |
| void operator delete(void* pointer, Zone* zone) { } |
| void operator delete(void* pointer) { } |
| |
| DEFINE_AST_VISITOR_SUBCLASS_MEMBERS(); |
| |
| private: |
| // Type of a member function that generates inline code for a native function. |
| typedef void (HOptimizedGraphBuilder::*InlineFunctionGenerator) |
| (CallRuntime* call); |
| |
| // Forward declarations for inner scope classes. |
| class SubgraphScope; |
| |
| static const InlineFunctionGenerator kInlineFunctionGenerators[]; |
| |
| static const int kMaxCallPolymorphism = 4; |
| static const int kMaxLoadPolymorphism = 4; |
| static const int kMaxStorePolymorphism = 4; |
| |
| // Even in the 'unlimited' case we have to have some limit in order not to |
| // overflow the stack. |
| static const int kUnlimitedMaxInlinedSourceSize = 100000; |
| static const int kUnlimitedMaxInlinedNodes = 10000; |
| static const int kUnlimitedMaxInlinedNodesCumulative = 10000; |
| |
| // Maximum depth and total number of elements and properties for literal |
| // graphs to be considered for fast deep-copying. |
| static const int kMaxFastLiteralDepth = 3; |
| static const int kMaxFastLiteralProperties = 8; |
| |
| // Simple accessors. |
| void set_function_state(FunctionState* state) { function_state_ = state; } |
| |
| AstContext* ast_context() const { return ast_context_; } |
| void set_ast_context(AstContext* context) { ast_context_ = context; } |
| |
| // Accessors forwarded to the function state. |
| CompilationInfo* current_info() const { |
| return function_state()->compilation_info(); |
| } |
| AstContext* call_context() const { |
| return function_state()->call_context(); |
| } |
| HBasicBlock* function_return() const { |
| return function_state()->function_return(); |
| } |
| TestContext* inlined_test_context() const { |
| return function_state()->test_context(); |
| } |
| void ClearInlinedTestContext() { |
| function_state()->ClearInlinedTestContext(); |
| } |
| StrictModeFlag function_strict_mode_flag() { |
| return function_state()->compilation_info()->is_classic_mode() |
| ? kNonStrictMode : kStrictMode; |
| } |
| |
| // Generators for inline runtime functions. |
| #define INLINE_FUNCTION_GENERATOR_DECLARATION(Name, argc, ressize) \ |
| void Generate##Name(CallRuntime* call); |
| |
| INLINE_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_DECLARATION) |
| INLINE_RUNTIME_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_DECLARATION) |
| #undef INLINE_FUNCTION_GENERATOR_DECLARATION |
| |
| void VisitDelete(UnaryOperation* expr); |
| void VisitVoid(UnaryOperation* expr); |
| void VisitTypeof(UnaryOperation* expr); |
| void VisitSub(UnaryOperation* expr); |
| void VisitBitNot(UnaryOperation* expr); |
| void VisitNot(UnaryOperation* expr); |
| |
| void VisitComma(BinaryOperation* expr); |
| void VisitLogicalExpression(BinaryOperation* expr); |
| void VisitArithmeticExpression(BinaryOperation* expr); |
| |
| bool PreProcessOsrEntry(IterationStatement* statement); |
| // True iff. we are compiling for OSR and the statement is the entry. |
| bool HasOsrEntryAt(IterationStatement* statement); |
| void VisitLoopBody(IterationStatement* stmt, |
| HBasicBlock* loop_entry, |
| BreakAndContinueInfo* break_info); |
| |
| // Create a back edge in the flow graph. body_exit is the predecessor |
| // block and loop_entry is the successor block. loop_successor is the |
| // block where control flow exits the loop normally (e.g., via failure of |
| // the condition) and break_block is the block where control flow breaks |
| // from the loop. All blocks except loop_entry can be NULL. The return |
| // value is the new successor block which is the join of loop_successor |
| // and break_block, or NULL. |
| HBasicBlock* CreateLoop(IterationStatement* statement, |
| HBasicBlock* loop_entry, |
| HBasicBlock* body_exit, |
| HBasicBlock* loop_successor, |
| HBasicBlock* break_block); |
| |
| HBasicBlock* JoinContinue(IterationStatement* statement, |
| HBasicBlock* exit_block, |
| HBasicBlock* continue_block); |
| |
| HValue* Top() const { return environment()->Top(); } |
| void Drop(int n) { environment()->Drop(n); } |
| void Bind(Variable* var, HValue* value) { environment()->Bind(var, value); } |
| bool IsEligibleForEnvironmentLivenessAnalysis(Variable* var, |
| int index, |
| HValue* value, |
| HEnvironment* env) { |
| if (!FLAG_analyze_environment_liveness) return false; |
| // |this| and |arguments| are always live; zapping parameters isn't |
| // safe because function.arguments can inspect them at any time. |
| return !var->is_this() && |
| !var->is_arguments() && |
| !value->IsArgumentsObject() && |
| env->is_local_index(index); |
| } |
| void BindIfLive(Variable* var, HValue* value) { |
| HEnvironment* env = environment(); |
| int index = env->IndexFor(var); |
| env->Bind(index, value); |
| if (IsEligibleForEnvironmentLivenessAnalysis(var, index, value, env)) { |
| HEnvironmentMarker* bind = |
| new(zone()) HEnvironmentMarker(HEnvironmentMarker::BIND, index); |
| AddInstruction(bind); |
| #ifdef DEBUG |
| bind->set_closure(env->closure()); |
| #endif |
| } |
| } |
| HValue* LookupAndMakeLive(Variable* var) { |
| HEnvironment* env = environment(); |
| int index = env->IndexFor(var); |
| HValue* value = env->Lookup(index); |
| if (IsEligibleForEnvironmentLivenessAnalysis(var, index, value, env)) { |
| HEnvironmentMarker* lookup = |
| new(zone()) HEnvironmentMarker(HEnvironmentMarker::LOOKUP, index); |
| AddInstruction(lookup); |
| #ifdef DEBUG |
| lookup->set_closure(env->closure()); |
| #endif |
| } |
| return value; |
| } |
| |
| // The value of the arguments object is allowed in some but not most value |
| // contexts. (It's allowed in all effect contexts and disallowed in all |
| // test contexts.) |
| void VisitForValue(Expression* expr, |
| ArgumentsAllowedFlag flag = ARGUMENTS_NOT_ALLOWED); |
| void VisitForTypeOf(Expression* expr); |
| void VisitForEffect(Expression* expr); |
| void VisitForControl(Expression* expr, |
| HBasicBlock* true_block, |
| HBasicBlock* false_block); |
| |
| // Visit an argument subexpression and emit a push to the outgoing arguments. |
| void VisitArgument(Expression* expr); |
| |
| void VisitArgumentList(ZoneList<Expression*>* arguments); |
| |
| // Visit a list of expressions from left to right, each in a value context. |
| void VisitExpressions(ZoneList<Expression*>* exprs); |
| |
| void PushAndAdd(HInstruction* instr); |
| |
| // Remove the arguments from the bailout environment and emit instructions |
| // to push them as outgoing parameters. |
| template <class Instruction> HInstruction* PreProcessCall(Instruction* call); |
| |
| static Representation ToRepresentation(TypeInfo info); |
| static Representation ToRepresentation(Handle<Type> type); |
| |
| void SetUpScope(Scope* scope); |
| virtual void VisitStatements(ZoneList<Statement*>* statements); |
| |
| #define DECLARE_VISIT(type) virtual void Visit##type(type* node); |
| AST_NODE_LIST(DECLARE_VISIT) |
| #undef DECLARE_VISIT |
| |
| // Helpers for flow graph construction. |
| enum GlobalPropertyAccess { |
| kUseCell, |
| kUseGeneric |
| }; |
| GlobalPropertyAccess LookupGlobalProperty(Variable* var, |
| LookupResult* lookup, |
| bool is_store); |
| |
| void EnsureArgumentsArePushedForAccess(); |
| bool TryArgumentsAccess(Property* expr); |
| |
| // Try to optimize fun.apply(receiver, arguments) pattern. |
| bool TryCallApply(Call* expr); |
| |
| int InliningAstSize(Handle<JSFunction> target); |
| bool TryInline(CallKind call_kind, |
| Handle<JSFunction> target, |
| int arguments_count, |
| HValue* implicit_return_value, |
| BailoutId ast_id, |
| BailoutId return_id, |
| InliningKind inlining_kind); |
| |
| bool TryInlineCall(Call* expr, bool drop_extra = false); |
| bool TryInlineConstruct(CallNew* expr, HValue* implicit_return_value); |
| bool TryInlineGetter(Handle<JSFunction> getter, Property* prop); |
| bool TryInlineSetter(Handle<JSFunction> setter, |
| BailoutId id, |
| BailoutId assignment_id, |
| HValue* implicit_return_value); |
| bool TryInlineApply(Handle<JSFunction> function, |
| Call* expr, |
| int arguments_count); |
| bool TryInlineBuiltinMethodCall(Call* expr, |
| HValue* receiver, |
| Handle<Map> receiver_map, |
| CheckType check_type); |
| bool TryInlineBuiltinFunctionCall(Call* expr, bool drop_extra); |
| |
| // If --trace-inlining, print a line of the inlining trace. Inlining |
| // succeeded if the reason string is NULL and failed if there is a |
| // non-NULL reason string. |
| void TraceInline(Handle<JSFunction> target, |
| Handle<JSFunction> caller, |
| const char* failure_reason); |
| |
| void HandleGlobalVariableAssignment(Variable* var, |
| HValue* value, |
| int position, |
| BailoutId ast_id); |
| |
| void HandlePropertyAssignment(Assignment* expr); |
| void HandleCompoundAssignment(Assignment* expr); |
| void HandlePolymorphicLoadNamedField(Property* expr, |
| HValue* object, |
| SmallMapList* types, |
| Handle<String> name); |
| HInstruction* TryLoadPolymorphicAsMonomorphic(Property* expr, |
| HValue* object, |
| SmallMapList* types, |
| Handle<String> name); |
| void HandlePolymorphicStoreNamedField(BailoutId id, |
| int position, |
| BailoutId assignment_id, |
| HValue* object, |
| HValue* value, |
| SmallMapList* types, |
| Handle<String> name); |
| bool TryStorePolymorphicAsMonomorphic(int position, |
| BailoutId assignment_id, |
| HValue* object, |
| HValue* value, |
| SmallMapList* types, |
| Handle<String> name); |
| void HandlePolymorphicCallNamed(Call* expr, |
| HValue* receiver, |
| SmallMapList* types, |
| Handle<String> name); |
| void HandleLiteralCompareTypeof(CompareOperation* expr, |
| HTypeof* typeof_expr, |
| Handle<String> check); |
| void HandleLiteralCompareNil(CompareOperation* expr, |
| HValue* value, |
| NilValue nil); |
| |
| HInstruction* BuildStringCharCodeAt(HValue* context, |
| HValue* string, |
| HValue* index); |
| HInstruction* BuildBinaryOperation(BinaryOperation* expr, |
| HValue* left, |
| HValue* right); |
| HInstruction* BuildIncrement(bool returns_original_input, |
| CountOperation* expr); |
| HInstruction* BuildLoadKeyedGeneric(HValue* object, |
| HValue* key); |
| |
| HInstruction* TryBuildConsolidatedElementLoad(HValue* object, |
| HValue* key, |
| HValue* val, |
| SmallMapList* maps); |
| |
| HInstruction* BuildMonomorphicElementAccess(HValue* object, |
| HValue* key, |
| HValue* val, |
| HValue* dependency, |
| Handle<Map> map, |
| bool is_store, |
| KeyedAccessStoreMode store_mode); |
| |
| HValue* HandlePolymorphicElementAccess(HValue* object, |
| HValue* key, |
| HValue* val, |
| Expression* prop, |
| BailoutId ast_id, |
| int position, |
| bool is_store, |
| KeyedAccessStoreMode store_mode, |
| bool* has_side_effects); |
| |
| HValue* HandleKeyedElementAccess(HValue* obj, |
| HValue* key, |
| HValue* val, |
| Expression* expr, |
| BailoutId ast_id, |
| int position, |
| bool is_store, |
| bool* has_side_effects); |
| |
| HInstruction* BuildLoadNamedGeneric(HValue* object, |
| Handle<String> name, |
| Property* expr); |
| HInstruction* BuildCallGetter(HValue* object, |
| Handle<Map> map, |
| Handle<JSFunction> getter, |
| Handle<JSObject> holder); |
| HInstruction* BuildLoadNamedMonomorphic(HValue* object, |
| Handle<String> name, |
| Property* expr, |
| Handle<Map> map); |
| |
| void AddCheckMap(HValue* object, Handle<Map> map); |
| |
| void AddCheckMapsWithTransitions(HValue* object, |
| Handle<Map> map); |
| |
| void BuildStoreNamed(Expression* expression, |
| BailoutId id, |
| int position, |
| BailoutId assignment_id, |
| Property* prop, |
| HValue* object, |
| HValue* value); |
| |
| HInstruction* BuildStoreNamedField(HValue* object, |
| Handle<String> name, |
| HValue* value, |
| Handle<Map> map, |
| LookupResult* lookup); |
| HInstruction* BuildStoreNamedGeneric(HValue* object, |
| Handle<String> name, |
| HValue* value); |
| HInstruction* BuildCallSetter(HValue* object, |
| HValue* value, |
| Handle<Map> map, |
| Handle<JSFunction> setter, |
| Handle<JSObject> holder); |
| HInstruction* BuildStoreNamedMonomorphic(HValue* object, |
| Handle<String> name, |
| HValue* value, |
| Handle<Map> map); |
| HInstruction* BuildStoreKeyedGeneric(HValue* object, |
| HValue* key, |
| HValue* value); |
| |
| HValue* BuildContextChainWalk(Variable* var); |
| |
| HInstruction* BuildThisFunction(); |
| |
| HInstruction* BuildFastLiteral(HValue* context, |
| Handle<JSObject> boilerplate_object, |
| Handle<JSObject> original_boilerplate_object, |
| int data_size, |
| int pointer_size, |
| AllocationSiteMode mode); |
| |
| void BuildEmitDeepCopy(Handle<JSObject> boilerplat_object, |
| Handle<JSObject> object, |
| HInstruction* target, |
| int* offset, |
| HInstruction* data_target, |
| int* data_offset, |
| AllocationSiteMode mode); |
| |
| MUST_USE_RESULT HValue* BuildEmitObjectHeader( |
| Handle<JSObject> boilerplat_object, |
| HInstruction* target, |
| HInstruction* data_target, |
| int object_offset, |
| int elements_offset, |
| int elements_size); |
| |
| void BuildEmitInObjectProperties(Handle<JSObject> boilerplate_object, |
| Handle<JSObject> original_boilerplate_object, |
| HValue* object_properties, |
| HInstruction* target, |
| int* offset, |
| HInstruction* data_target, |
| int* data_offset); |
| |
| void BuildEmitElements(Handle<FixedArrayBase> elements, |
| Handle<FixedArrayBase> original_elements, |
| ElementsKind kind, |
| HValue* object_elements, |
| HInstruction* target, |
| int* offset, |
| HInstruction* data_target, |
| int* data_offset); |
| |
| void BuildEmitFixedDoubleArray(Handle<FixedArrayBase> elements, |
| ElementsKind kind, |
| HValue* object_elements); |
| |
| void BuildEmitFixedArray(Handle<FixedArrayBase> elements, |
| Handle<FixedArrayBase> original_elements, |
| ElementsKind kind, |
| HValue* object_elements, |
| HInstruction* target, |
| int* offset, |
| HInstruction* data_target, |
| int* data_offset); |
| |
| void AddCheckPrototypeMaps(Handle<JSObject> holder, |
| Handle<Map> receiver_map); |
| |
| void AddCheckConstantFunction(Handle<JSObject> holder, |
| HValue* receiver, |
| Handle<Map> receiver_map); |
| |
| bool MatchRotateRight(HValue* left, |
| HValue* right, |
| HValue** operand, |
| HValue** shift_amount); |
| |
| // The translation state of the currently-being-translated function. |
| FunctionState* function_state_; |
| |
| // The base of the function state stack. |
| FunctionState initial_function_state_; |
| |
| // Expression context of the currently visited subexpression. NULL when |
| // visiting statements. |
| AstContext* ast_context_; |
| |
| // A stack of breakable statements entered. |
| BreakAndContinueScope* break_scope_; |
| |
| int inlined_count_; |
| ZoneList<Handle<Object> > globals_; |
| |
| bool inline_bailout_; |
| |
| friend class FunctionState; // Pushes and pops the state stack. |
| friend class AstContext; // Pushes and pops the AST context stack. |
| friend class KeyedLoadFastElementStub; |
| |
| DISALLOW_COPY_AND_ASSIGN(HOptimizedGraphBuilder); |
| }; |
| |
| |
| Zone* AstContext::zone() const { return owner_->zone(); } |
| |
| |
| class HStatistics: public Malloced { |
| public: |
| HStatistics() |
| : timing_(5), |
| names_(5), |
| sizes_(5), |
| create_graph_(0), |
| optimize_graph_(0), |
| generate_code_(0), |
| total_size_(0), |
| full_code_gen_(0), |
| source_size_(0) { } |
| |
| void Initialize(CompilationInfo* info); |
| void Print(); |
| void SaveTiming(const char* name, int64_t ticks, unsigned size); |
| |
| void IncrementFullCodeGen(int64_t full_code_gen) { |
| full_code_gen_ += full_code_gen; |
| } |
| |
| void IncrementSubtotals(int64_t create_graph, |
| int64_t optimize_graph, |
| int64_t generate_code) { |
| create_graph_ += create_graph; |
| optimize_graph_ += optimize_graph; |
| generate_code_ += generate_code; |
| } |
| |
| private: |
| List<int64_t> timing_; |
| List<const char*> names_; |
| List<unsigned> sizes_; |
| int64_t create_graph_; |
| int64_t optimize_graph_; |
| int64_t generate_code_; |
| unsigned total_size_; |
| int64_t full_code_gen_; |
| double source_size_; |
| }; |
| |
| |
| class HPhase : public CompilationPhase { |
| public: |
| HPhase(const char* name, HGraph* graph) |
| : CompilationPhase(name, graph->info()), |
| graph_(graph) { } |
| ~HPhase(); |
| |
| protected: |
| HGraph* graph() const { return graph_; } |
| |
| private: |
| HGraph* graph_; |
| |
| DISALLOW_COPY_AND_ASSIGN(HPhase); |
| }; |
| |
| |
| class HTracer: public Malloced { |
| public: |
| explicit HTracer(int isolate_id) |
| : trace_(&string_allocator_), indent_(0) { |
| OS::SNPrintF(filename_, |
| "hydrogen-%d-%d.cfg", |
| OS::GetCurrentProcessId(), |
| isolate_id); |
| WriteChars(filename_.start(), "", 0, false); |
| } |
| |
| void TraceCompilation(CompilationInfo* info); |
| void TraceHydrogen(const char* name, HGraph* graph); |
| void TraceLithium(const char* name, LChunk* chunk); |
| void TraceLiveRanges(const char* name, LAllocator* allocator); |
| |
| private: |
| class Tag BASE_EMBEDDED { |
| public: |
| Tag(HTracer* tracer, const char* name) { |
| name_ = name; |
| tracer_ = tracer; |
| tracer->PrintIndent(); |
| tracer->trace_.Add("begin_%s\n", name); |
| tracer->indent_++; |
| } |
| |
| ~Tag() { |
| tracer_->indent_--; |
| tracer_->PrintIndent(); |
| tracer_->trace_.Add("end_%s\n", name_); |
| ASSERT(tracer_->indent_ >= 0); |
| tracer_->FlushToFile(); |
| } |
| |
| private: |
| HTracer* tracer_; |
| const char* name_; |
| }; |
| |
| void TraceLiveRange(LiveRange* range, const char* type, Zone* zone); |
| void Trace(const char* name, HGraph* graph, LChunk* chunk); |
| void FlushToFile(); |
| |
| void PrintEmptyProperty(const char* name) { |
| PrintIndent(); |
| trace_.Add("%s\n", name); |
| } |
| |
| void PrintStringProperty(const char* name, const char* value) { |
| PrintIndent(); |
| trace_.Add("%s \"%s\"\n", name, value); |
| } |
| |
| void PrintLongProperty(const char* name, int64_t value) { |
| PrintIndent(); |
| trace_.Add("%s %d000\n", name, static_cast<int>(value / 1000)); |
| } |
| |
| void PrintBlockProperty(const char* name, int block_id) { |
| PrintIndent(); |
| trace_.Add("%s \"B%d\"\n", name, block_id); |
| } |
| |
| void PrintIntProperty(const char* name, int value) { |
| PrintIndent(); |
| trace_.Add("%s %d\n", name, value); |
| } |
| |
| void PrintIndent() { |
| for (int i = 0; i < indent_; i++) { |
| trace_.Add(" "); |
| } |
| } |
| |
| EmbeddedVector<char, 64> filename_; |
| HeapStringAllocator string_allocator_; |
| StringStream trace_; |
| int indent_; |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_HYDROGEN_H_ |