| // Copyright 2011 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/codegen/compilation-cache.h" |
| |
| #include "src/common/globals.h" |
| #include "src/heap/factory.h" |
| #include "src/logging/counters.h" |
| #include "src/logging/log.h" |
| #include "src/objects/compilation-cache-table-inl.h" |
| #include "src/objects/objects-inl.h" |
| #include "src/objects/slots.h" |
| #include "src/objects/visitors.h" |
| #include "src/utils/ostreams.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // The number of generations for each sub cache. |
| static const int kRegExpGenerations = 2; |
| |
| // Initial size of each compilation cache table allocated. |
| static const int kInitialCacheSize = 64; |
| |
| CompilationCache::CompilationCache(Isolate* isolate) |
| : isolate_(isolate), |
| script_(isolate), |
| eval_global_(isolate), |
| eval_contextual_(isolate), |
| reg_exp_(isolate, kRegExpGenerations), |
| code_(isolate), |
| enabled_script_and_eval_(true) { |
| CompilationSubCache* subcaches[kSubCacheCount] = { |
| &script_, &eval_global_, &eval_contextual_, ®_exp_, &code_}; |
| for (int i = 0; i < kSubCacheCount; ++i) { |
| subcaches_[i] = subcaches[i]; |
| } |
| } |
| |
| Handle<CompilationCacheTable> CompilationSubCache::GetTable(int generation) { |
| DCHECK_LT(generation, generations()); |
| Handle<CompilationCacheTable> result; |
| if (tables_[generation].IsUndefined(isolate())) { |
| result = CompilationCacheTable::New(isolate(), kInitialCacheSize); |
| tables_[generation] = *result; |
| } else { |
| CompilationCacheTable table = |
| CompilationCacheTable::cast(tables_[generation]); |
| result = Handle<CompilationCacheTable>(table, isolate()); |
| } |
| return result; |
| } |
| |
| // static |
| void CompilationSubCache::AgeByGeneration(CompilationSubCache* c) { |
| DCHECK_GT(c->generations(), 1); |
| |
| // Age the generations implicitly killing off the oldest. |
| for (int i = c->generations() - 1; i > 0; i--) { |
| c->tables_[i] = c->tables_[i - 1]; |
| } |
| |
| // Set the first generation as unborn. |
| c->tables_[0] = ReadOnlyRoots(c->isolate()).undefined_value(); |
| } |
| |
| // static |
| void CompilationSubCache::AgeCustom(CompilationSubCache* c) { |
| DCHECK_EQ(c->generations(), 1); |
| if (c->tables_[0].IsUndefined(c->isolate())) return; |
| CompilationCacheTable::cast(c->tables_[0]).Age(); |
| } |
| |
| void CompilationCacheScript::Age() { |
| if (FLAG_isolate_script_cache_ageing) AgeCustom(this); |
| } |
| void CompilationCacheEval::Age() { AgeCustom(this); } |
| void CompilationCacheRegExp::Age() { AgeByGeneration(this); } |
| void CompilationCacheCode::Age() { |
| if (FLAG_turbo_nci_cache_ageing) { |
| if (FLAG_trace_turbo_nci) CompilationCacheCode::TraceAgeing(); |
| AgeByGeneration(this); |
| } |
| } |
| |
| void CompilationSubCache::Iterate(RootVisitor* v) { |
| v->VisitRootPointers(Root::kCompilationCache, nullptr, |
| FullObjectSlot(&tables_[0]), |
| FullObjectSlot(&tables_[generations()])); |
| } |
| |
| void CompilationSubCache::Clear() { |
| MemsetPointer(reinterpret_cast<Address*>(tables_), |
| ReadOnlyRoots(isolate()).undefined_value().ptr(), |
| generations()); |
| } |
| |
| void CompilationSubCache::Remove(Handle<SharedFunctionInfo> function_info) { |
| // Probe the script generation tables. Make sure not to leak handles |
| // into the caller's handle scope. |
| { |
| HandleScope scope(isolate()); |
| for (int generation = 0; generation < generations(); generation++) { |
| Handle<CompilationCacheTable> table = GetTable(generation); |
| table->Remove(*function_info); |
| } |
| } |
| } |
| |
| CompilationCacheScript::CompilationCacheScript(Isolate* isolate) |
| : CompilationSubCache(isolate, 1) {} |
| |
| // 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, |
| MaybeHandle<Object> maybe_name, |
| int line_offset, int column_offset, |
| ScriptOriginOptions resource_options) { |
| 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. |
| Handle<Object> name; |
| if (!maybe_name.ToHandle(&name)) { |
| return script->name().IsUndefined(isolate()); |
| } |
| // Do the fast bailout checks first. |
| if (line_offset != script->line_offset()) return false; |
| if (column_offset != script->column_offset()) return false; |
| // Check that both names are strings. If not, no match. |
| if (!name->IsString() || !script->name().IsString()) return false; |
| // Are the origin_options same? |
| if (resource_options.Flags() != script->origin_options().Flags()) |
| return false; |
| // Compare the two name strings for equality. |
| return String::Equals( |
| isolate(), Handle<String>::cast(name), |
| Handle<String>(String::cast(script->name()), isolate())); |
| } |
| |
| // 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. |
| MaybeHandle<SharedFunctionInfo> CompilationCacheScript::Lookup( |
| Handle<String> source, MaybeHandle<Object> name, int line_offset, |
| int column_offset, ScriptOriginOptions resource_options, |
| Handle<Context> native_context, LanguageMode language_mode) { |
| MaybeHandle<SharedFunctionInfo> result; |
| |
| // Probe the script generation tables. Make sure not to leak handles |
| // into the caller's handle scope. |
| { |
| HandleScope scope(isolate()); |
| const int generation = 0; |
| DCHECK_EQ(generations(), 1); |
| Handle<CompilationCacheTable> table = GetTable(generation); |
| MaybeHandle<SharedFunctionInfo> probe = CompilationCacheTable::LookupScript( |
| table, source, native_context, language_mode); |
| Handle<SharedFunctionInfo> function_info; |
| if (probe.ToHandle(&function_info)) { |
| // Break when we've found a suitable shared function info that |
| // matches the origin. |
| if (HasOrigin(function_info, name, line_offset, column_offset, |
| resource_options)) { |
| result = scope.CloseAndEscape(function_info); |
| } |
| } |
| } |
| |
| // 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. |
| Handle<SharedFunctionInfo> function_info; |
| if (result.ToHandle(&function_info)) { |
| #ifdef DEBUG |
| // Since HasOrigin can allocate, we need to protect the SharedFunctionInfo |
| // with handles during the call. |
| DCHECK(HasOrigin(function_info, name, line_offset, column_offset, |
| resource_options)); |
| #endif |
| isolate()->counters()->compilation_cache_hits()->Increment(); |
| LOG(isolate(), CompilationCacheEvent("hit", "script", *function_info)); |
| } else { |
| isolate()->counters()->compilation_cache_misses()->Increment(); |
| } |
| return result; |
| } |
| |
| void CompilationCacheScript::Put(Handle<String> source, |
| Handle<Context> native_context, |
| LanguageMode language_mode, |
| Handle<SharedFunctionInfo> function_info) { |
| HandleScope scope(isolate()); |
| Handle<CompilationCacheTable> table = GetFirstTable(); |
| SetFirstTable(CompilationCacheTable::PutScript(table, source, native_context, |
| language_mode, function_info)); |
| } |
| |
| InfoCellPair CompilationCacheEval::Lookup(Handle<String> source, |
| Handle<SharedFunctionInfo> outer_info, |
| Handle<Context> native_context, |
| LanguageMode language_mode, |
| int position) { |
| HandleScope scope(isolate()); |
| // 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. |
| InfoCellPair result; |
| const int generation = 0; |
| DCHECK_EQ(generations(), 1); |
| Handle<CompilationCacheTable> table = GetTable(generation); |
| result = CompilationCacheTable::LookupEval( |
| table, source, outer_info, native_context, language_mode, position); |
| if (result.has_shared()) { |
| isolate()->counters()->compilation_cache_hits()->Increment(); |
| } else { |
| isolate()->counters()->compilation_cache_misses()->Increment(); |
| } |
| return result; |
| } |
| |
| void CompilationCacheEval::Put(Handle<String> source, |
| Handle<SharedFunctionInfo> outer_info, |
| Handle<SharedFunctionInfo> function_info, |
| Handle<Context> native_context, |
| Handle<FeedbackCell> feedback_cell, |
| int position) { |
| HandleScope scope(isolate()); |
| Handle<CompilationCacheTable> table = GetFirstTable(); |
| table = |
| CompilationCacheTable::PutEval(table, source, outer_info, function_info, |
| native_context, feedback_cell, position); |
| SetFirstTable(table); |
| } |
| |
| MaybeHandle<FixedArray> CompilationCacheRegExp::Lookup(Handle<String> source, |
| JSRegExp::Flags flags) { |
| HandleScope scope(isolate()); |
| // 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. |
| Handle<Object> result = isolate()->factory()->undefined_value(); |
| int generation; |
| 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 = Handle<FixedArray>::cast(result); |
| if (generation != 0) { |
| Put(source, flags, data); |
| } |
| isolate()->counters()->compilation_cache_hits()->Increment(); |
| return scope.CloseAndEscape(data); |
| } else { |
| isolate()->counters()->compilation_cache_misses()->Increment(); |
| return MaybeHandle<FixedArray>(); |
| } |
| } |
| |
| void CompilationCacheRegExp::Put(Handle<String> source, JSRegExp::Flags flags, |
| Handle<FixedArray> data) { |
| HandleScope scope(isolate()); |
| Handle<CompilationCacheTable> table = GetFirstTable(); |
| SetFirstTable( |
| CompilationCacheTable::PutRegExp(isolate(), table, source, flags, data)); |
| } |
| |
| MaybeHandle<Code> CompilationCacheCode::Lookup(Handle<SharedFunctionInfo> key) { |
| // 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. |
| HandleScope scope(isolate()); |
| MaybeHandle<Code> maybe_value; |
| int generation = 0; |
| for (; generation < generations(); generation++) { |
| Handle<CompilationCacheTable> table = GetTable(generation); |
| maybe_value = table->LookupCode(key); |
| if (!maybe_value.is_null()) break; |
| } |
| |
| if (maybe_value.is_null()) { |
| isolate()->counters()->compilation_cache_misses()->Increment(); |
| return MaybeHandle<Code>(); |
| } |
| |
| Handle<Code> value = maybe_value.ToHandleChecked(); |
| if (generation != 0) Put(key, value); // Add to the first generation. |
| isolate()->counters()->compilation_cache_hits()->Increment(); |
| return scope.CloseAndEscape(value); |
| } |
| |
| void CompilationCacheCode::Put(Handle<SharedFunctionInfo> key, |
| Handle<Code> value) { |
| HandleScope scope(isolate()); |
| Handle<CompilationCacheTable> table = GetFirstTable(); |
| SetFirstTable(CompilationCacheTable::PutCode(isolate(), table, key, value)); |
| } |
| |
| void CompilationCacheCode::TraceAgeing() { |
| DCHECK(FLAG_trace_turbo_nci); |
| StdoutStream os; |
| os << "NCI cache ageing: Removing oldest generation" << std::endl; |
| } |
| |
| void CompilationCacheCode::TraceInsertion(Handle<SharedFunctionInfo> key, |
| Handle<Code> value) { |
| DCHECK(FLAG_trace_turbo_nci); |
| StdoutStream os; |
| os << "NCI cache insertion: " << Brief(*key) << ", " << Brief(*value) |
| << std::endl; |
| } |
| |
| void CompilationCacheCode::TraceHit(Handle<SharedFunctionInfo> key, |
| Handle<Code> value) { |
| DCHECK(FLAG_trace_turbo_nci); |
| StdoutStream os; |
| os << "NCI cache hit: " << Brief(*key) << ", " << Brief(*value) << std::endl; |
| } |
| |
| void CompilationCache::Remove(Handle<SharedFunctionInfo> function_info) { |
| if (!IsEnabledScriptAndEval()) return; |
| |
| eval_global_.Remove(function_info); |
| eval_contextual_.Remove(function_info); |
| script_.Remove(function_info); |
| } |
| |
| MaybeHandle<SharedFunctionInfo> CompilationCache::LookupScript( |
| Handle<String> source, MaybeHandle<Object> name, int line_offset, |
| int column_offset, ScriptOriginOptions resource_options, |
| Handle<Context> native_context, LanguageMode language_mode) { |
| if (!IsEnabledScriptAndEval()) return MaybeHandle<SharedFunctionInfo>(); |
| |
| return script_.Lookup(source, name, line_offset, column_offset, |
| resource_options, native_context, language_mode); |
| } |
| |
| InfoCellPair CompilationCache::LookupEval(Handle<String> source, |
| Handle<SharedFunctionInfo> outer_info, |
| Handle<Context> context, |
| LanguageMode language_mode, |
| int position) { |
| InfoCellPair result; |
| if (!IsEnabledScriptAndEval()) return result; |
| |
| const char* cache_type; |
| |
| if (context->IsNativeContext()) { |
| result = eval_global_.Lookup(source, outer_info, context, language_mode, |
| position); |
| cache_type = "eval-global"; |
| |
| } else { |
| DCHECK_NE(position, kNoSourcePosition); |
| Handle<Context> native_context(context->native_context(), isolate()); |
| result = eval_contextual_.Lookup(source, outer_info, native_context, |
| language_mode, position); |
| cache_type = "eval-contextual"; |
| } |
| |
| if (result.has_shared()) { |
| LOG(isolate(), CompilationCacheEvent("hit", cache_type, result.shared())); |
| } |
| |
| return result; |
| } |
| |
| MaybeHandle<FixedArray> CompilationCache::LookupRegExp(Handle<String> source, |
| JSRegExp::Flags flags) { |
| return reg_exp_.Lookup(source, flags); |
| } |
| |
| MaybeHandle<Code> CompilationCache::LookupCode(Handle<SharedFunctionInfo> sfi) { |
| return code_.Lookup(sfi); |
| } |
| |
| void CompilationCache::PutScript(Handle<String> source, |
| Handle<Context> native_context, |
| LanguageMode language_mode, |
| Handle<SharedFunctionInfo> function_info) { |
| if (!IsEnabledScriptAndEval()) return; |
| LOG(isolate(), CompilationCacheEvent("put", "script", *function_info)); |
| |
| script_.Put(source, native_context, language_mode, function_info); |
| } |
| |
| void CompilationCache::PutEval(Handle<String> source, |
| Handle<SharedFunctionInfo> outer_info, |
| Handle<Context> context, |
| Handle<SharedFunctionInfo> function_info, |
| Handle<FeedbackCell> feedback_cell, |
| int position) { |
| if (!IsEnabledScriptAndEval()) return; |
| |
| const char* cache_type; |
| HandleScope scope(isolate()); |
| if (context->IsNativeContext()) { |
| eval_global_.Put(source, outer_info, function_info, context, feedback_cell, |
| position); |
| cache_type = "eval-global"; |
| } else { |
| DCHECK_NE(position, kNoSourcePosition); |
| Handle<Context> native_context(context->native_context(), isolate()); |
| eval_contextual_.Put(source, outer_info, function_info, native_context, |
| feedback_cell, position); |
| cache_type = "eval-contextual"; |
| } |
| LOG(isolate(), CompilationCacheEvent("put", cache_type, *function_info)); |
| } |
| |
| void CompilationCache::PutRegExp(Handle<String> source, JSRegExp::Flags flags, |
| Handle<FixedArray> data) { |
| reg_exp_.Put(source, flags, data); |
| } |
| |
| void CompilationCache::PutCode(Handle<SharedFunctionInfo> shared, |
| Handle<Code> code) { |
| code_.Put(shared, code); |
| } |
| |
| void CompilationCache::Clear() { |
| for (int i = 0; i < kSubCacheCount; i++) { |
| subcaches_[i]->Clear(); |
| } |
| } |
| |
| void CompilationCache::Iterate(RootVisitor* 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::EnableScriptAndEval() { |
| enabled_script_and_eval_ = true; |
| } |
| |
| void CompilationCache::DisableScriptAndEval() { |
| enabled_script_and_eval_ = false; |
| Clear(); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |
