runtime/CodeCache.cpp

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All Rights Reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27
  28 #include "CodeCache.h"
  29
  30 #include "BytecodeGenerator.h"
  31 #include "CodeSpecializationKind.h"
  32 #include "Operations.h"
  33 #include "Parser.h"
  34 #include "StrongInlines.h"
  35 #include "UnlinkedCodeBlock.h"
  36
  37 namespace JSC {
  38
  39 const double CodeCacheMap::workingSetTime = 10.0;
  40 const int64_t CodeCacheMap::globalWorkingSetMaxBytes = 16000000;
  41 const size_t CodeCacheMap::globalWorkingSetMaxEntries = 2000;
  42 const unsigned CodeCacheMap::nonGlobalWorkingSetScale = 20;
  43 const int64_t CodeCacheMap::nonGlobalWorkingSetMaxBytes = CodeCacheMap::globalWorkingSetMaxBytes / CodeCacheMap::nonGlobalWorkingSetScale;
  44 const size_t CodeCacheMap::nonGlobalWorkingSetMaxEntries = CodeCacheMap::globalWorkingSetMaxEntries / CodeCacheMap::nonGlobalWorkingSetScale;
  45
  46 void CodeCacheMap::pruneSlowCase()
  47 {
  48     m_minCapacity = std::max(m_size - m_sizeAtLastPrune, static_cast<int64_t>(0));
  49     m_sizeAtLastPrune = m_size;
  50     m_timeAtLastPrune = monotonicallyIncreasingTime();
  51
  52     if (m_capacity < m_minCapacity)
  53         m_capacity = m_minCapacity;
  54
  55     while (m_size > m_capacity || !canPruneQuickly()) {
  56         MapType::iterator it = m_map.begin();
  57         m_size -= it->key.length();
  58         m_map.remove(it);
  59     }
  60 }
  61
  62 CodeCache::CodeCache(CodeCacheKind kind)
  63 : m_sourceCode(kind == GlobalCodeCache ? CodeCacheMap::globalWorkingSetMaxBytes : CodeCacheMap::nonGlobalWorkingSetMaxBytes,
  64     kind == GlobalCodeCache ? CodeCacheMap::globalWorkingSetMaxEntries : CodeCacheMap::nonGlobalWorkingSetMaxEntries)
  65 {
  66 }
  67
  68 CodeCache::~CodeCache()
  69 {
  70 }
  71
  72 template <typename T> struct CacheTypes { };
  73
  74 template <> struct CacheTypes<UnlinkedProgramCodeBlock> {
  75     typedef JSC::ProgramNode RootNode;
  76     static const SourceCodeKey::CodeType codeType = SourceCodeKey::ProgramType;
  77 };
  78
  79 template <> struct CacheTypes<UnlinkedEvalCodeBlock> {
  80     typedef JSC::EvalNode RootNode;
  81     static const SourceCodeKey::CodeType codeType = SourceCodeKey::EvalType;
  82 };
  83
  84 template <class UnlinkedCodeBlockType, class ExecutableType>
  85 UnlinkedCodeBlockType* CodeCache::generateBytecode(VM& vm, JSScope* scope, ExecutableType* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
  86 {
  87     typedef typename CacheTypes<UnlinkedCodeBlockType>::RootNode RootNode;
  88     RefPtr<RootNode> rootNode = parse<RootNode>(&vm, source, 0, Identifier(), strictness, JSParseProgramCode, error);
  89     if (!rootNode)
  90         return 0;
  91     executable->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), rootNode->lineNo(), rootNode->lastLine(), rootNode->startColumn());
  92
  93     UnlinkedCodeBlockType* unlinkedCode = UnlinkedCodeBlockType::create(&vm, executable->executableInfo());
  94     unlinkedCode->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), rootNode->lineNo() - source.firstLine(), rootNode->lastLine() - rootNode->lineNo());
  95     OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(vm, scope, rootNode.get(), unlinkedCode, debuggerMode, profilerMode)));
  96     error = generator->generate();
  97     rootNode->destroyData();
  98     if (error.m_type != ParserError::ErrorNone)
  99         return 0;
 100     return unlinkedCode;
 101 }
 102
 103 template <class UnlinkedCodeBlockType, class ExecutableType>
 104 UnlinkedCodeBlockType* CodeCache::getCodeBlock(VM& vm, JSScope* scope, ExecutableType* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
 105 {
 106     // We completely skip the cache if we're an eval that isn't at the top of the scope chain.
 107     if (CacheTypes<UnlinkedCodeBlockType>::codeType == SourceCodeKey::EvalType) {
 108         if (scope->next() && !scope->isActivationObject())
 109             return generateBytecode<UnlinkedCodeBlockType, ExecutableType>(vm, scope, executable, source, strictness, debuggerMode, profilerMode, error);
 110     }
 111
 112     SourceCodeKey key = SourceCodeKey(source, String(), CacheTypes<UnlinkedCodeBlockType>::codeType, strictness);
 113     CodeCacheMap::AddResult addResult = m_sourceCode.add(key, SourceCodeValue());
 114     bool canCache = debuggerMode == DebuggerOff && profilerMode == ProfilerOff;
 115
 116     if (!addResult.isNewEntry && canCache) {
 117         UnlinkedCodeBlockType* unlinkedCode = jsCast<UnlinkedCodeBlockType*>(addResult.iterator->value.cell.get());
 118         unsigned firstLine = source.firstLine() + unlinkedCode->firstLine();
 119         unsigned startColumn = source.firstLine() ? source.startColumn() : 0;
 120         executable->recordParse(unlinkedCode->codeFeatures(), unlinkedCode->hasCapturedVariables(), firstLine, firstLine + unlinkedCode->lineCount(), startColumn);
 121         return unlinkedCode;
 122     }
 123     UnlinkedCodeBlockType* unlinkedCode = generateBytecode<UnlinkedCodeBlockType, ExecutableType>(vm, scope, executable, source, strictness, debuggerMode, profilerMode, error);
 124
 125     if (!canCache || !unlinkedCode) {
 126         m_sourceCode.remove(addResult.iterator);
 127         return unlinkedCode;
 128     }
 129
 130     addResult.iterator->value = SourceCodeValue(vm, unlinkedCode, m_sourceCode.age());
 131     return unlinkedCode;
 132 }
 133
 134 UnlinkedProgramCodeBlock* CodeCache::getProgramCodeBlock(VM& vm, ProgramExecutable* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
 135 {
 136     return getCodeBlock<UnlinkedProgramCodeBlock>(vm, 0, executable, source, strictness, debuggerMode, profilerMode, error);
 137 }
 138
 139 UnlinkedEvalCodeBlock* CodeCache::getEvalCodeBlock(VM& vm, JSScope* scope, EvalExecutable* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
 140 {
 141     return getCodeBlock<UnlinkedEvalCodeBlock>(vm, scope, executable, source, strictness, debuggerMode, profilerMode, error);
 142 }
 143
 144 UnlinkedFunctionExecutable* CodeCache::getFunctionExecutableFromGlobalCode(VM& vm, const Identifier& name, const SourceCode& source, ParserError& error)
 145 {
 146     SourceCodeKey key = SourceCodeKey(source, name.string(), SourceCodeKey::FunctionType, JSParseNormal);
 147     CodeCacheMap::AddResult addResult = m_sourceCode.add(key, SourceCodeValue());
 148     if (!addResult.isNewEntry)
 149         return jsCast<UnlinkedFunctionExecutable*>(addResult.iterator->value.cell.get());
 150
 151     RefPtr<ProgramNode> program = parse<ProgramNode>(&vm, source, 0, Identifier(), JSParseNormal, JSParseProgramCode, error);
 152     if (!program) {
 153         ASSERT(error.m_type != ParserError::ErrorNone);
 154         m_sourceCode.remove(addResult.iterator);
 155         return 0;
 156     }
 157
 158     // This function assumes an input string that would result in a single anonymous function expression.
 159     StatementNode* exprStatement = program->singleStatement();
 160     ASSERT(exprStatement);
 161     ASSERT(exprStatement->isExprStatement());
 162     ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
 163     ASSERT(funcExpr);
 164     RELEASE_ASSERT(funcExpr->isFuncExprNode());
 165     FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
 166     ASSERT(body);
 167     ASSERT(body->ident().isNull());
 168
 169     UnlinkedFunctionExecutable* functionExecutable = UnlinkedFunctionExecutable::create(&vm, source, body);
 170     functionExecutable->m_nameValue.set(vm, functionExecutable, jsString(&vm, name.string()));
 171
 172     addResult.iterator->value = SourceCodeValue(vm, functionExecutable, m_sourceCode.age());
 173     return functionExecutable;
 174 }
 175
 176 }