7d6a3b433f
now, the custom call generator stuff is disabled. Review URL: http://codereview.chromium.org/1094014 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4217 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
535 lines
17 KiB
C++
535 lines
17 KiB
C++
// Copyright 2008 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.
|
|
|
|
#include "v8.h"
|
|
|
|
#include "compilation-cache.h"
|
|
#include "serialize.h"
|
|
|
|
namespace v8 {
|
|
namespace internal {
|
|
|
|
// The number of sub caches covering the different types to cache.
|
|
static const int kSubCacheCount = 4;
|
|
|
|
// The number of generations for each sub cache.
|
|
// The number of ScriptGenerations is carefully chosen based on histograms.
|
|
// See issue 458: http://code.google.com/p/v8/issues/detail?id=458
|
|
static const int kScriptGenerations = 5;
|
|
static const int kEvalGlobalGenerations = 2;
|
|
static const int kEvalContextualGenerations = 2;
|
|
static const int kRegExpGenerations = 2;
|
|
|
|
// Initial size of each compilation cache table allocated.
|
|
static const int kInitialCacheSize = 64;
|
|
|
|
// Index for the first generation in the cache.
|
|
static const int kFirstGeneration = 0;
|
|
|
|
// The compilation cache consists of several generational sub-caches which uses
|
|
// this class as a base class. A sub-cache contains a compilation cache tables
|
|
// for each generation of the sub-cache. Since the same source code string has
|
|
// different compiled code for scripts and evals, we use separate sub-caches
|
|
// for different compilation modes, to avoid retrieving the wrong result.
|
|
class CompilationSubCache {
|
|
public:
|
|
explicit CompilationSubCache(int generations): generations_(generations) {
|
|
tables_ = NewArray<Object*>(generations);
|
|
}
|
|
|
|
~CompilationSubCache() { DeleteArray(tables_); }
|
|
|
|
// Get the compilation cache tables for a specific generation.
|
|
Handle<CompilationCacheTable> GetTable(int generation);
|
|
|
|
// Accessors for first generation.
|
|
Handle<CompilationCacheTable> GetFirstTable() {
|
|
return GetTable(kFirstGeneration);
|
|
}
|
|
void SetFirstTable(Handle<CompilationCacheTable> value) {
|
|
ASSERT(kFirstGeneration < generations_);
|
|
tables_[kFirstGeneration] = *value;
|
|
}
|
|
|
|
// Age the sub-cache by evicting the oldest generation and creating a new
|
|
// young generation.
|
|
void Age();
|
|
|
|
// GC support.
|
|
void Iterate(ObjectVisitor* v);
|
|
|
|
// Clear this sub-cache evicting all its content.
|
|
void Clear();
|
|
|
|
// Number of generations in this sub-cache.
|
|
inline int generations() { return generations_; }
|
|
|
|
private:
|
|
int generations_; // Number of generations.
|
|
Object** tables_; // Compilation cache tables - one for each generation.
|
|
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationSubCache);
|
|
};
|
|
|
|
|
|
// Sub-cache for scripts.
|
|
class CompilationCacheScript : public CompilationSubCache {
|
|
public:
|
|
explicit CompilationCacheScript(int generations)
|
|
: CompilationSubCache(generations) { }
|
|
|
|
Handle<SharedFunctionInfo> Lookup(Handle<String> source,
|
|
Handle<Object> name,
|
|
int line_offset,
|
|
int column_offset);
|
|
void Put(Handle<String> source, Handle<SharedFunctionInfo> function_info);
|
|
|
|
private:
|
|
// Note: Returns a new hash table if operation results in expansion.
|
|
Handle<CompilationCacheTable> TablePut(
|
|
Handle<String> source, Handle<SharedFunctionInfo> function_info);
|
|
|
|
bool HasOrigin(Handle<SharedFunctionInfo> function_info,
|
|
Handle<Object> name,
|
|
int line_offset,
|
|
int column_offset);
|
|
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheScript);
|
|
};
|
|
|
|
|
|
// Sub-cache for eval scripts.
|
|
class CompilationCacheEval: public CompilationSubCache {
|
|
public:
|
|
explicit CompilationCacheEval(int generations)
|
|
: CompilationSubCache(generations) { }
|
|
|
|
Handle<SharedFunctionInfo> Lookup(Handle<String> source,
|
|
Handle<Context> context);
|
|
|
|
void Put(Handle<String> source,
|
|
Handle<Context> context,
|
|
Handle<SharedFunctionInfo> function_info);
|
|
|
|
private:
|
|
// Note: Returns a new hash table if operation results in expansion.
|
|
Handle<CompilationCacheTable> TablePut(
|
|
Handle<String> source,
|
|
Handle<Context> context,
|
|
Handle<SharedFunctionInfo> function_info);
|
|
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheEval);
|
|
};
|
|
|
|
|
|
// Sub-cache for regular expressions.
|
|
class CompilationCacheRegExp: public CompilationSubCache {
|
|
public:
|
|
explicit CompilationCacheRegExp(int generations)
|
|
: CompilationSubCache(generations) { }
|
|
|
|
Handle<FixedArray> Lookup(Handle<String> source, JSRegExp::Flags flags);
|
|
|
|
void Put(Handle<String> source,
|
|
JSRegExp::Flags flags,
|
|
Handle<FixedArray> data);
|
|
private:
|
|
// Note: Returns a new hash table if operation results in expansion.
|
|
Handle<CompilationCacheTable> TablePut(Handle<String> source,
|
|
JSRegExp::Flags flags,
|
|
Handle<FixedArray> data);
|
|
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheRegExp);
|
|
};
|
|
|
|
|
|
// Statically allocate all the sub-caches.
|
|
static CompilationCacheScript script(kScriptGenerations);
|
|
static CompilationCacheEval eval_global(kEvalGlobalGenerations);
|
|
static CompilationCacheEval eval_contextual(kEvalContextualGenerations);
|
|
static CompilationCacheRegExp reg_exp(kRegExpGenerations);
|
|
static CompilationSubCache* subcaches[kSubCacheCount] =
|
|
{&script, &eval_global, &eval_contextual, ®_exp};
|
|
|
|
|
|
// Current enable state of the compilation cache.
|
|
static bool enabled = true;
|
|
static inline bool IsEnabled() {
|
|
return FLAG_compilation_cache && enabled;
|
|
}
|
|
|
|
|
|
static Handle<CompilationCacheTable> AllocateTable(int size) {
|
|
CALL_HEAP_FUNCTION(CompilationCacheTable::Allocate(size),
|
|
CompilationCacheTable);
|
|
}
|
|
|
|
|
|
Handle<CompilationCacheTable> CompilationSubCache::GetTable(int generation) {
|
|
ASSERT(generation < generations_);
|
|
Handle<CompilationCacheTable> result;
|
|
if (tables_[generation]->IsUndefined()) {
|
|
result = AllocateTable(kInitialCacheSize);
|
|
tables_[generation] = *result;
|
|
} else {
|
|
CompilationCacheTable* table =
|
|
CompilationCacheTable::cast(tables_[generation]);
|
|
result = Handle<CompilationCacheTable>(table);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
void CompilationSubCache::Age() {
|
|
// Age the generations implicitly killing off the oldest.
|
|
for (int i = generations_ - 1; i > 0; i--) {
|
|
tables_[i] = tables_[i - 1];
|
|
}
|
|
|
|
// Set the first generation as unborn.
|
|
tables_[0] = Heap::undefined_value();
|
|
}
|
|
|
|
|
|
void CompilationSubCache::Iterate(ObjectVisitor* v) {
|
|
v->VisitPointers(&tables_[0], &tables_[generations_]);
|
|
}
|
|
|
|
|
|
void CompilationSubCache::Clear() {
|
|
MemsetPointer(tables_, Heap::undefined_value(), generations_);
|
|
}
|
|
|
|
|
|
// We only re-use a cached function for some script source code if the
|
|
// script originates from the same place. This is to avoid issues
|
|
// when reporting errors, etc.
|
|
bool CompilationCacheScript::HasOrigin(
|
|
Handle<SharedFunctionInfo> function_info,
|
|
Handle<Object> name,
|
|
int line_offset,
|
|
int column_offset) {
|
|
Handle<Script> script =
|
|
Handle<Script>(Script::cast(function_info->script()));
|
|
// 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;
|
|
// Compare the two name strings for equality.
|
|
return String::cast(*name)->Equals(String::cast(script->name()));
|
|
}
|
|
|
|
|
|
// TODO(245): Need to allow identical code from different contexts to
|
|
// be cached in the same script generation. Currently the first use
|
|
// will be cached, but subsequent code from different source / line
|
|
// won't.
|
|
Handle<SharedFunctionInfo> CompilationCacheScript::Lookup(Handle<String> source,
|
|
Handle<Object> name,
|
|
int line_offset,
|
|
int column_offset) {
|
|
Object* result = NULL;
|
|
int generation;
|
|
|
|
// Probe the script generation tables. Make sure not to leak handles
|
|
// into the caller's handle scope.
|
|
{ HandleScope scope;
|
|
for (generation = 0; generation < generations(); generation++) {
|
|
Handle<CompilationCacheTable> table = GetTable(generation);
|
|
Handle<Object> probe(table->Lookup(*source));
|
|
if (probe->IsSharedFunctionInfo()) {
|
|
Handle<SharedFunctionInfo> function_info =
|
|
Handle<SharedFunctionInfo>::cast(probe);
|
|
// Break when we've found a suitable boilerplate function that
|
|
// matches the origin.
|
|
if (HasOrigin(function_info, name, line_offset, column_offset)) {
|
|
result = *function_info;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void* script_histogram = StatsTable::CreateHistogram(
|
|
"V8.ScriptCache",
|
|
0,
|
|
kScriptGenerations,
|
|
kScriptGenerations + 1);
|
|
|
|
if (script_histogram != NULL) {
|
|
// The level NUMBER_OF_SCRIPT_GENERATIONS is equivalent to a cache miss.
|
|
StatsTable::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));
|
|
ASSERT(HasOrigin(shared, name, line_offset, column_offset));
|
|
// 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, shared);
|
|
Counters::compilation_cache_hits.Increment();
|
|
return shared;
|
|
} else {
|
|
Counters::compilation_cache_misses.Increment();
|
|
return Handle<SharedFunctionInfo>::null();
|
|
}
|
|
}
|
|
|
|
|
|
Handle<CompilationCacheTable> CompilationCacheScript::TablePut(
|
|
Handle<String> source,
|
|
Handle<SharedFunctionInfo> function_info) {
|
|
CALL_HEAP_FUNCTION(GetFirstTable()->Put(*source, *function_info),
|
|
CompilationCacheTable);
|
|
}
|
|
|
|
|
|
void CompilationCacheScript::Put(Handle<String> source,
|
|
Handle<SharedFunctionInfo> function_info) {
|
|
HandleScope scope;
|
|
SetFirstTable(TablePut(source, function_info));
|
|
}
|
|
|
|
|
|
Handle<SharedFunctionInfo> CompilationCacheEval::Lookup(
|
|
Handle<String> source, Handle<Context> context) {
|
|
// Make sure not to leak the table into the surrounding handle
|
|
// scope. Otherwise, we risk keeping old tables around even after
|
|
// having cleared the cache.
|
|
Object* result = NULL;
|
|
int generation;
|
|
{ HandleScope scope;
|
|
for (generation = 0; generation < generations(); generation++) {
|
|
Handle<CompilationCacheTable> table = GetTable(generation);
|
|
result = table->LookupEval(*source, *context);
|
|
if (result->IsSharedFunctionInfo()) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (result->IsSharedFunctionInfo()) {
|
|
Handle<SharedFunctionInfo>
|
|
function_info(SharedFunctionInfo::cast(result));
|
|
if (generation != 0) {
|
|
Put(source, context, function_info);
|
|
}
|
|
Counters::compilation_cache_hits.Increment();
|
|
return function_info;
|
|
} else {
|
|
Counters::compilation_cache_misses.Increment();
|
|
return Handle<SharedFunctionInfo>::null();
|
|
}
|
|
}
|
|
|
|
|
|
Handle<CompilationCacheTable> CompilationCacheEval::TablePut(
|
|
Handle<String> source,
|
|
Handle<Context> context,
|
|
Handle<SharedFunctionInfo> function_info) {
|
|
CALL_HEAP_FUNCTION(GetFirstTable()->PutEval(*source,
|
|
*context,
|
|
*function_info),
|
|
CompilationCacheTable);
|
|
}
|
|
|
|
|
|
void CompilationCacheEval::Put(Handle<String> source,
|
|
Handle<Context> context,
|
|
Handle<SharedFunctionInfo> function_info) {
|
|
HandleScope scope;
|
|
SetFirstTable(TablePut(source, context, function_info));
|
|
}
|
|
|
|
|
|
Handle<FixedArray> CompilationCacheRegExp::Lookup(Handle<String> source,
|
|
JSRegExp::Flags flags) {
|
|
// Make sure not to leak the table into the surrounding handle
|
|
// scope. Otherwise, we risk keeping old tables around even after
|
|
// having cleared the cache.
|
|
Object* result = NULL;
|
|
int generation;
|
|
{ HandleScope scope;
|
|
for (generation = 0; generation < generations(); generation++) {
|
|
Handle<CompilationCacheTable> table = GetTable(generation);
|
|
result = table->LookupRegExp(*source, flags);
|
|
if (result->IsFixedArray()) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (result->IsFixedArray()) {
|
|
Handle<FixedArray> data(FixedArray::cast(result));
|
|
if (generation != 0) {
|
|
Put(source, flags, data);
|
|
}
|
|
Counters::compilation_cache_hits.Increment();
|
|
return data;
|
|
} else {
|
|
Counters::compilation_cache_misses.Increment();
|
|
return Handle<FixedArray>::null();
|
|
}
|
|
}
|
|
|
|
|
|
Handle<CompilationCacheTable> CompilationCacheRegExp::TablePut(
|
|
Handle<String> source,
|
|
JSRegExp::Flags flags,
|
|
Handle<FixedArray> data) {
|
|
CALL_HEAP_FUNCTION(GetFirstTable()->PutRegExp(*source, flags, *data),
|
|
CompilationCacheTable);
|
|
}
|
|
|
|
|
|
void CompilationCacheRegExp::Put(Handle<String> source,
|
|
JSRegExp::Flags flags,
|
|
Handle<FixedArray> data) {
|
|
HandleScope scope;
|
|
SetFirstTable(TablePut(source, flags, data));
|
|
}
|
|
|
|
|
|
Handle<SharedFunctionInfo> CompilationCache::LookupScript(Handle<String> source,
|
|
Handle<Object> name,
|
|
int line_offset,
|
|
int column_offset) {
|
|
if (!IsEnabled()) {
|
|
return Handle<SharedFunctionInfo>::null();
|
|
}
|
|
|
|
return script.Lookup(source, name, line_offset, column_offset);
|
|
}
|
|
|
|
|
|
Handle<SharedFunctionInfo> CompilationCache::LookupEval(Handle<String> source,
|
|
Handle<Context> context,
|
|
bool is_global) {
|
|
if (!IsEnabled()) {
|
|
return Handle<SharedFunctionInfo>::null();
|
|
}
|
|
|
|
Handle<SharedFunctionInfo> result;
|
|
if (is_global) {
|
|
result = eval_global.Lookup(source, context);
|
|
} else {
|
|
result = eval_contextual.Lookup(source, context);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
Handle<FixedArray> CompilationCache::LookupRegExp(Handle<String> source,
|
|
JSRegExp::Flags flags) {
|
|
if (!IsEnabled()) {
|
|
return Handle<FixedArray>::null();
|
|
}
|
|
|
|
return reg_exp.Lookup(source, flags);
|
|
}
|
|
|
|
|
|
void CompilationCache::PutScript(Handle<String> source,
|
|
Handle<SharedFunctionInfo> function_info) {
|
|
if (!IsEnabled()) {
|
|
return;
|
|
}
|
|
|
|
script.Put(source, function_info);
|
|
}
|
|
|
|
|
|
void CompilationCache::PutEval(Handle<String> source,
|
|
Handle<Context> context,
|
|
bool is_global,
|
|
Handle<SharedFunctionInfo> function_info) {
|
|
if (!IsEnabled()) {
|
|
return;
|
|
}
|
|
|
|
HandleScope scope;
|
|
if (is_global) {
|
|
eval_global.Put(source, context, function_info);
|
|
} else {
|
|
eval_contextual.Put(source, context, function_info);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void CompilationCache::PutRegExp(Handle<String> source,
|
|
JSRegExp::Flags flags,
|
|
Handle<FixedArray> data) {
|
|
if (!IsEnabled()) {
|
|
return;
|
|
}
|
|
|
|
reg_exp.Put(source, flags, data);
|
|
}
|
|
|
|
|
|
void CompilationCache::Clear() {
|
|
for (int i = 0; i < kSubCacheCount; i++) {
|
|
subcaches[i]->Clear();
|
|
}
|
|
}
|
|
|
|
|
|
void CompilationCache::Iterate(ObjectVisitor* v) {
|
|
for (int i = 0; i < kSubCacheCount; i++) {
|
|
subcaches[i]->Iterate(v);
|
|
}
|
|
}
|
|
|
|
|
|
void CompilationCache::MarkCompactPrologue() {
|
|
for (int i = 0; i < kSubCacheCount; i++) {
|
|
subcaches[i]->Age();
|
|
}
|
|
}
|
|
|
|
|
|
void CompilationCache::Enable() {
|
|
enabled = true;
|
|
}
|
|
|
|
|
|
void CompilationCache::Disable() {
|
|
enabled = false;
|
|
Clear();
|
|
}
|
|
|
|
|
|
} } // namespace v8::internal
|