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 "JSCInlines.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
  41 void CodeCacheMap::pruneSlowCase()
  42 {
  43     m_minCapacity = std::max(m_size - m_sizeAtLastPrune, static_cast<int64_t>(0));
  44     m_sizeAtLastPrune = m_size;
  45     m_timeAtLastPrune = monotonicallyIncreasingTime();
  46
  47     if (m_capacity < m_minCapacity)
  48         m_capacity = m_minCapacity;
  49
  50     while (m_size > m_capacity || !canPruneQuickly()) {
  51         MapType::iterator it = m_map.begin();
  52         m_size -= it->key.length();
  53         m_map.remove(it);
  54     }
  55 }
  56
  57 CodeCache::CodeCache()
  58 {
  59 }
  60
  61 CodeCache::~CodeCache()
  62 {
  63 }
  64
  65 template <typename T> struct CacheTypes { };
  66
  67 template <> struct CacheTypes<UnlinkedProgramCodeBlock> {
  68     typedef JSC::ProgramNode RootNode;
  69     static const SourceCodeKey::CodeType codeType = SourceCodeKey::ProgramType;
  70 };
  71
  72 template <> struct CacheTypes<UnlinkedEvalCodeBlock> {
  73     typedef JSC::EvalNode RootNode;
  74     static const SourceCodeKey::CodeType codeType = SourceCodeKey::EvalType;
  75 };
  76
  77 template <class UnlinkedCodeBlockType, class ExecutableType>
  78 UnlinkedCodeBlockType* CodeCache::getGlobalCodeBlock(VM& vm, ExecutableType* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
  79 {
  80     SourceCodeKey key = SourceCodeKey(source, String(), CacheTypes<UnlinkedCodeBlockType>::codeType, strictness);
  81     CodeCacheMap::AddResult addResult = m_sourceCode.add(key, SourceCodeValue());
  82     bool canCache = debuggerMode == DebuggerOff && profilerMode == ProfilerOff;
  83     if (!addResult.isNewEntry && canCache) {
  84         UnlinkedCodeBlockType* unlinkedCodeBlock = jsCast<UnlinkedCodeBlockType*>(addResult.iterator->value.cell.get());
  85         unsigned firstLine = source.firstLine() + unlinkedCodeBlock->firstLine();
  86         unsigned lineCount = unlinkedCodeBlock->lineCount();
  87         unsigned startColumn = unlinkedCodeBlock->startColumn() + source.startColumn();
  88         bool endColumnIsOnStartLine = !lineCount;
  89         unsigned endColumn = unlinkedCodeBlock->endColumn() + (endColumnIsOnStartLine ? startColumn : 1);
  90         executable->recordParse(unlinkedCodeBlock->codeFeatures(), unlinkedCodeBlock->hasCapturedVariables(), firstLine, firstLine + lineCount, startColumn, endColumn);
  91         return unlinkedCodeBlock;
  92     }
  93
  94     typedef typename CacheTypes<UnlinkedCodeBlockType>::RootNode RootNode;
  95     RefPtr<RootNode> rootNode = parse<RootNode>(&vm, source, 0, Identifier(), strictness, JSParseProgramCode, error);
  96     if (!rootNode) {
  97         m_sourceCode.remove(addResult.iterator);
  98         return 0;
  99     }
 100     unsigned lineCount = rootNode->lastLine() - rootNode->lineNo();
 101     unsigned startColumn = rootNode->startColumn() + 1;
 102     bool endColumnIsOnStartLine = !lineCount;
 103     unsigned unlinkedEndColumn = rootNode->endColumn();
 104     unsigned endColumn = unlinkedEndColumn + (endColumnIsOnStartLine ? startColumn : 1);
 105     executable->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), rootNode->lineNo(), rootNode->lastLine(), startColumn, endColumn);
 106
 107     UnlinkedCodeBlockType* unlinkedCodeBlock = UnlinkedCodeBlockType::create(&vm, executable->executableInfo());
 108     unlinkedCodeBlock->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), rootNode->lineNo() - source.firstLine(), lineCount, unlinkedEndColumn);
 109
 110     OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(vm, rootNode.get(), unlinkedCodeBlock, debuggerMode, profilerMode)));
 111     error = generator->generate();
 112     rootNode->destroyData();
 113     if (error.m_type != ParserError::ErrorNone) {
 114         m_sourceCode.remove(addResult.iterator);
 115         return 0;
 116     }
 117
 118     if (!canCache) {
 119         m_sourceCode.remove(addResult.iterator);
 120         return unlinkedCodeBlock;
 121     }
 122
 123     addResult.iterator->value = SourceCodeValue(vm, unlinkedCodeBlock, m_sourceCode.age());
 124     return unlinkedCodeBlock;
 125 }
 126
 127 UnlinkedProgramCodeBlock* CodeCache::getProgramCodeBlock(VM& vm, ProgramExecutable* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
 128 {
 129     return getGlobalCodeBlock<UnlinkedProgramCodeBlock>(vm, executable, source, strictness, debuggerMode, profilerMode, error);
 130 }
 131
 132 UnlinkedEvalCodeBlock* CodeCache::getEvalCodeBlock(VM& vm, EvalExecutable* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
 133 {
 134     return getGlobalCodeBlock<UnlinkedEvalCodeBlock>(vm, executable, source, strictness, debuggerMode, profilerMode, error);
 135 }
 136
 137 UnlinkedFunctionExecutable* CodeCache::getFunctionExecutableFromGlobalCode(VM& vm, const Identifier& name, const SourceCode& source, ParserError& error)
 138 {
 139     SourceCodeKey key = SourceCodeKey(source, name.string(), SourceCodeKey::FunctionType, JSParseNormal);
 140     CodeCacheMap::AddResult addResult = m_sourceCode.add(key, SourceCodeValue());
 141     if (!addResult.isNewEntry)
 142         return jsCast<UnlinkedFunctionExecutable*>(addResult.iterator->value.cell.get());
 143
 144     JSTextPosition positionBeforeLastNewline;
 145     RefPtr<ProgramNode> program = parse<ProgramNode>(&vm, source, 0, Identifier(), JSParseNormal, JSParseProgramCode, error, &positionBeforeLastNewline);
 146     if (!program) {
 147         RELEASE_ASSERT(error.m_type != ParserError::ErrorNone);
 148         m_sourceCode.remove(addResult.iterator);
 149         return 0;
 150     }
 151
 152     // This function assumes an input string that would result in a single anonymous function expression.
 153     StatementNode* exprStatement = program->singleStatement();
 154     RELEASE_ASSERT(exprStatement);
 155     RELEASE_ASSERT(exprStatement->isExprStatement());
 156     ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
 157     RELEASE_ASSERT(funcExpr);
 158     RELEASE_ASSERT(funcExpr->isFuncExprNode());
 159     FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
 160     RELEASE_ASSERT(!program->hasCapturedVariables());
 161
 162     body->setEndPosition(positionBeforeLastNewline);
 163     RELEASE_ASSERT(body);
 164     RELEASE_ASSERT(body->ident().isNull());
 165
 166     UnlinkedFunctionExecutable* functionExecutable = UnlinkedFunctionExecutable::create(&vm, source, body, UnlinkedNormalFunction);
 167     functionExecutable->m_nameValue.set(vm, functionExecutable, jsString(&vm, name.string()));
 168
 169     addResult.iterator->value = SourceCodeValue(vm, functionExecutable, m_sourceCode.age());
 170     return functionExecutable;
 171 }
 172
 173 }