v8::internal::CompilationCacheScript Class Reference

#include <compilation-cache.h>

Inheritance diagram for v8::internal::CompilationCacheScript:

Collaboration diagram for v8::internal::CompilationCacheScript:

Public Member Functions
	CompilationCacheScript (Isolate *isolate, int generations)
Handle< SharedFunctionInfo >	Lookup (Handle< String > source, Handle< Object > name, int line_offset, int column_offset, bool is_shared_cross_origin, Handle< Context > context)
void	Put (Handle< String > source, Handle< Context > context, Handle< SharedFunctionInfo > function_info)
Public Member Functions inherited from v8::internal::CompilationSubCache
	CompilationSubCache (Isolate *isolate, int generations)
	~CompilationSubCache ()
Handle< CompilationCacheTable >	GetTable (int generation)
Handle< CompilationCacheTable >	GetFirstTable ()
void	SetFirstTable (Handle< CompilationCacheTable > value)
void	Age ()
void	Iterate (ObjectVisitor *v)
void	IterateFunctions (ObjectVisitor *v)
void	Clear ()
void	Remove (Handle< SharedFunctionInfo > function_info)
int	generations ()

Private Member Functions
bool	HasOrigin (Handle< SharedFunctionInfo > function_info, Handle< Object > name, int line_offset, int column_offset, bool is_shared_cross_origin)
	DISALLOW_IMPLICIT_CONSTRUCTORS (CompilationCacheScript)

Private Attributes
void *	script_histogram_
bool	script_histogram_initialized_

Additional Inherited Members
Static Public Attributes inherited from v8::internal::CompilationSubCache
static const int	kFirstGeneration = 0
Protected Member Functions inherited from v8::internal::CompilationSubCache
Isolate *	isolate ()

Detailed Description

Definition at line 71 of file compilation-cache.h.

Constructor & Destructor Documentation

CompilationCacheScript()

v8::internal::CompilationCacheScript::CompilationCacheScript	(	Isolate *	isolate,
		int	generations
	)

Definition at line 103 of file compilation-cache.cc.

    : CompilationSubCache(isolate, generations),
      script_histogram_(NULL),
      script_histogram_initialized_(false) { }

Member Function Documentation

DISALLOW_IMPLICIT_CONSTRUCTORS()

v8::internal::CompilationCacheScript::DISALLOW_IMPLICIT_CONSTRUCTORS ( CompilationCacheScript  )

private

HasOrigin()

bool v8::internal::CompilationCacheScript::HasOrigin ( Handle< SharedFunctionInfo >  function_info, Handle< Object >  name, int  line_offset, int  column_offset, bool  is_shared_cross_origin  )

private

Definition at line 113 of file compilation-cache.cc.

                                 {
  Handle<Script> script =
      Handle<Script>(Script::cast(function_info->script()), isolate());
  // If the script name isn't set, the boilerplate script should have
  // an undefined name to have the same origin.
  if (name.is_null()) {
    return script->name()->IsUndefined();
  }
  // Do the fast bailout checks first.
  if (line_offset != script->line_offset()->value()) return false;
  if (column_offset != script->column_offset()->value()) return false;
  // Check that both names are strings. If not, no match.
  if (!name->IsString() || !script->name()->IsString()) return false;
  // Were both scripts tagged by the embedder as being shared cross-origin?
  if (is_shared_cross_origin != script->is_shared_cross_origin()) return false;
  // Compare the two name strings for equality.
  return String::Equals(Handle<String>::cast(name),
                        Handle<String>(String::cast(script->name())));
}

References v8::internal::String::Equals(), v8::internal::CompilationSubCache::isolate(), and name.

Referenced by Lookup().

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Lookup()

Handle< SharedFunctionInfo > v8::internal::CompilationCacheScript::Lookup	(	Handle< String >	source,
		Handle< Object >	name,
		int	line_offset,
		int	column_offset,
		bool	is_shared_cross_origin,
		Handle< Context >	context
	)

Definition at line 143 of file compilation-cache.cc.

                             {
  Object* result = NULL;
  int generation;
 
  // Probe the script generation tables. Make sure not to leak handles
  // into the caller's handle scope.
  { HandleScope scope(isolate());
    for (generation = 0; generation < generations(); generation++) {
      Handle<CompilationCacheTable> table = GetTable(generation);
      Handle<Object> probe = table->Lookup(source, context);
      if (probe->IsSharedFunctionInfo()) {
        Handle<SharedFunctionInfo> function_info =
            Handle<SharedFunctionInfo>::cast(probe);
        // Break when we've found a suitable shared function info that
        // matches the origin.
        if (HasOrigin(function_info,
                      name,
                      line_offset,
                      column_offset,
                      is_shared_cross_origin)) {
          result = *function_info;
          break;
        }
      }
    }
  }
 
  if (!script_histogram_initialized_) {
    script_histogram_ = isolate()->stats_table()->CreateHistogram(
        "V8.ScriptCache",
        0,
        kScriptGenerations,
        kScriptGenerations + 1);
    script_histogram_initialized_ = true;
  }
 
  if (script_histogram_ != NULL) {
    // The level NUMBER_OF_SCRIPT_GENERATIONS is equivalent to a cache miss.
    isolate()->stats_table()->AddHistogramSample(script_histogram_, generation);
  }
 
  // Once outside the manacles of the handle scope, we need to recheck
  // to see if we actually found a cached script. If so, we return a
  // handle created in the caller's handle scope.
  if (result != NULL) {
    Handle<SharedFunctionInfo> shared(SharedFunctionInfo::cast(result),
                                      isolate());
    DCHECK(HasOrigin(shared,
                     name,
                     line_offset,
                     column_offset,
                     is_shared_cross_origin));
    // If the script was found in a later generation, we promote it to
    // the first generation to let it survive longer in the cache.
    if (generation != 0) Put(source, context, shared);
    isolate()->counters()->compilation_cache_hits()->Increment();
    return shared;
  } else {
    isolate()->counters()->compilation_cache_misses()->Increment();
    return Handle<SharedFunctionInfo>::null();
  }
}

References v8::internal::StatsTable::AddHistogramSample(), v8::internal::Handle< T >::cast(), v8::internal::Isolate::counters(), v8::internal::StatsTable::CreateHistogram(), DCHECK, v8::internal::CompilationSubCache::generations(), v8::internal::CompilationSubCache::GetTable(), HasOrigin(), v8::internal::CompilationSubCache::isolate(), v8::internal::kScriptGenerations, name, NULL, v8::internal::Handle< T >::null(), Put(), script_histogram_, script_histogram_initialized_, and v8::internal::Isolate::stats_table().

Referenced by v8::internal::CompilationCache::LookupScript().

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Put()

void v8::internal::CompilationCacheScript::Put	(	Handle< String >	source,
		Handle< Context >	context,
		Handle< SharedFunctionInfo >	function_info
	)

Definition at line 213 of file compilation-cache.cc.

                                                                           {
  HandleScope scope(isolate());
  Handle<CompilationCacheTable> table = GetFirstTable();
  SetFirstTable(
      CompilationCacheTable::Put(table, source, context, function_info));
}

References v8::internal::CompilationSubCache::GetFirstTable(), v8::internal::CompilationSubCache::isolate(), v8::internal::CompilationCacheTable::Put(), and v8::internal::CompilationSubCache::SetFirstTable().

Referenced by Lookup(), and v8::internal::CompilationCache::PutScript().

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Member Data Documentation

script_histogram_

void* v8::internal::CompilationCacheScript::script_histogram_

private

Definition at line 92 of file compilation-cache.h.

Referenced by Lookup().

script_histogram_initialized_

bool v8::internal::CompilationCacheScript::script_histogram_initialized_

private

Definition at line 93 of file compilation-cache.h.

Referenced by Lookup().

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

• /mnt/V8SourceCode/src/compilation-cache.h
• /mnt/V8SourceCode/src/compilation-cache.cc