v8::internal::HOsrBuilder Class Reference

#include <hydrogen-osr.h>

Inheritance diagram for v8::internal::HOsrBuilder:

Collaboration diagram for v8::internal::HOsrBuilder:

Public Member Functions
	HOsrBuilder (HOptimizedGraphBuilder *builder)
HBasicBlock *	BuildOsrLoopEntry (IterationStatement *statement)
void	FinishGraph ()
void	FinishOsrValues ()
int	UnoptimizedFrameSlots () const
bool	HasOsrEntryAt (IterationStatement *statement)
Public Member Functions inherited from v8::internal::ZoneObject
	INLINE (void *operator new(size_t size, Zone *zone))
void	operator delete (void *, size_t)
void	operator delete (void *pointer, Zone *zone)

Private Attributes
int	unoptimized_frame_slots_
HOptimizedGraphBuilder *	builder_
HBasicBlock *	osr_entry_
HBasicBlock *	osr_loop_entry_
ZoneList< HUnknownOSRValue * > *	osr_values_

Detailed Description

Definition at line 17 of file hydrogen-osr.h.

Constructor & Destructor Documentation

HOsrBuilder()

v8::internal::HOsrBuilder::HOsrBuilder ( HOptimizedGraphBuilder *  builder )

inlineexplicit

Definition at line 19 of file hydrogen-osr.h.

    : unoptimized_frame_slots_(0),
      builder_(builder),
      osr_entry_(NULL),
      osr_loop_entry_(NULL),
      osr_values_(NULL) { }

Member Function Documentation

BuildOsrLoopEntry()

HBasicBlock * v8::internal::HOsrBuilder::BuildOsrLoopEntry

(

IterationStatement *

statement

)

Definition at line 17 of file hydrogen-osr.cc.

                                                                         {
  DCHECK(HasOsrEntryAt(statement));
 
  Zone* zone = builder_->zone();
  HGraph* graph = builder_->graph();
 
  // only one OSR point per compile is allowed.
  DCHECK(graph->osr() == NULL);
 
  // remember this builder as the one OSR builder in the graph.
  graph->set_osr(this);
 
  HBasicBlock* non_osr_entry = graph->CreateBasicBlock();
  osr_entry_ = graph->CreateBasicBlock();
  HValue* true_value = graph->GetConstantTrue();
  HBranch* test = builder_->New<HBranch>(true_value, ToBooleanStub::Types(),
                                         non_osr_entry, osr_entry_);
  builder_->FinishCurrentBlock(test);
 
  HBasicBlock* loop_predecessor = graph->CreateBasicBlock();
  builder_->Goto(non_osr_entry, loop_predecessor);
 
  builder_->set_current_block(osr_entry_);
  osr_entry_->set_osr_entry();
  BailoutId osr_entry_id = statement->OsrEntryId();
 
  HEnvironment *environment = builder_->environment();
  int first_expression_index = environment->first_expression_index();
  int length = environment->length();
  osr_values_ = new(zone) ZoneList<HUnknownOSRValue*>(length, zone);
 
  for (int i = 0; i < first_expression_index; ++i) {
    HUnknownOSRValue* osr_value
        = builder_->Add<HUnknownOSRValue>(environment, i);
    environment->Bind(i, osr_value);
    osr_values_->Add(osr_value, zone);
  }
 
  if (first_expression_index != length) {
    environment->Drop(length - first_expression_index);
    for (int i = first_expression_index; i < length; ++i) {
      HUnknownOSRValue* osr_value
          = builder_->Add<HUnknownOSRValue>(environment, i);
      environment->Push(osr_value);
      osr_values_->Add(osr_value, zone);
    }
  }
 
  unoptimized_frame_slots_ =
      environment->local_count() + environment->push_count();
 
  // Keep a copy of the old environment, since the OSR values need it
  // to figure out where exactly they are located in the unoptimized frame.
  environment = environment->Copy();
  builder_->current_block()->UpdateEnvironment(environment);
 
  builder_->Add<HSimulate>(osr_entry_id);
  builder_->Add<HOsrEntry>(osr_entry_id);
  HContext* context = builder_->Add<HContext>();
  environment->BindContext(context);
  builder_->Goto(loop_predecessor);
  loop_predecessor->SetJoinId(statement->EntryId());
  builder_->set_current_block(loop_predecessor);
 
  // Create the final loop entry
  osr_loop_entry_ = builder_->BuildLoopEntry();
  return osr_loop_entry_;
}

References v8::internal::HGraphBuilder::Add(), v8::internal::List< T, AllocationPolicy >::Add(), builder_, v8::internal::HOptimizedGraphBuilder::BuildLoopEntry(), v8::internal::HGraphBuilder::current_block(), DCHECK, v8::internal::BreakableStatement::EntryId(), v8::internal::HGraphBuilder::environment(), v8::internal::HGraphBuilder::FinishCurrentBlock(), v8::internal::HGraphBuilder::Goto(), v8::internal::HGraphBuilder::graph(), HasOsrEntryAt(), v8::internal::HGraphBuilder::New(), NULL, osr_entry_, osr_loop_entry_, osr_values_, v8::internal::IterationStatement::OsrEntryId(), v8::internal::HGraphBuilder::set_current_block(), unoptimized_frame_slots_, and v8::internal::HGraphBuilder::zone().

Referenced by v8::internal::HOptimizedGraphBuilder::BuildLoopEntry().

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FinishGraph()

void v8::internal::HOsrBuilder::FinishGraph

(

)

Definition at line 87 of file hydrogen-osr.cc.

                              {
  // do nothing for now.
}

Referenced by v8::internal::HOptimizedGraphBuilder::BuildGraph().

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FinishOsrValues()

void v8::internal::HOsrBuilder::FinishOsrValues

(

)

Definition at line 92 of file hydrogen-osr.cc.

                                  {
  const ZoneList<HPhi*>* phis = osr_loop_entry_->phis();
  for (int j = 0; j < phis->length(); j++) {
    HPhi* phi = phis->at(j);
    if (phi->HasMergedIndex()) {
      osr_values_->at(phi->merged_index())->set_incoming_value(phi);
    }
  }
}

References v8::internal::List< T, AllocationPolicy >::at(), osr_loop_entry_, and osr_values_.

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HasOsrEntryAt()

bool v8::internal::HOsrBuilder::HasOsrEntryAt

(

IterationStatement *

statement

)

Definition at line 12 of file hydrogen-osr.cc.

                                                             {
  return statement->OsrEntryId() == builder_->current_info()->osr_ast_id();
}

References builder_, v8::internal::HOptimizedGraphBuilder::current_info(), v8::internal::CompilationInfo::osr_ast_id(), and v8::internal::IterationStatement::OsrEntryId().

Referenced by v8::internal::HOptimizedGraphBuilder::BuildLoopEntry(), and BuildOsrLoopEntry().

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UnoptimizedFrameSlots()

int v8::internal::HOsrBuilder::UnoptimizedFrameSlots ( ) const

inline

Definition at line 38 of file hydrogen-osr.h.

                                    {
    return unoptimized_frame_slots_;
  }

References unoptimized_frame_slots_.

Member Data Documentation

builder_

HOptimizedGraphBuilder* v8::internal::HOsrBuilder::builder_

private

Definition at line 46 of file hydrogen-osr.h.

Referenced by BuildOsrLoopEntry(), and HasOsrEntryAt().

osr_entry_

HBasicBlock* v8::internal::HOsrBuilder::osr_entry_

private

Definition at line 47 of file hydrogen-osr.h.

Referenced by BuildOsrLoopEntry().

osr_loop_entry_

HBasicBlock* v8::internal::HOsrBuilder::osr_loop_entry_

private

Definition at line 48 of file hydrogen-osr.h.

Referenced by BuildOsrLoopEntry(), and FinishOsrValues().

osr_values_

ZoneList<HUnknownOSRValue*>* v8::internal::HOsrBuilder::osr_values_

private

Definition at line 49 of file hydrogen-osr.h.

Referenced by BuildOsrLoopEntry(), and FinishOsrValues().

unoptimized_frame_slots_

int v8::internal::HOsrBuilder::unoptimized_frame_slots_

private

Definition at line 45 of file hydrogen-osr.h.

Referenced by BuildOsrLoopEntry(), and UnoptimizedFrameSlots().

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The documentation for this class was generated from the following files:

• /mnt/V8SourceCode/src/hydrogen-osr.h
• /mnt/V8SourceCode/src/hydrogen-osr.cc