webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 184 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/CodeCache.cpp b/Source/JavaScriptCore/runtime/CodeCache.cpp
new file mode 100644
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+++ b/Source/JavaScriptCore/runtime/CodeCache.cpp
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+/*
+ * Copyright (C) 2012 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "config.h"
+
+#include "CodeCache.h"
+
+#include "BytecodeGenerator.h"
+#include "CodeSpecializationKind.h"
+#include "JSCInlines.h"
+#include "Parser.h"
+#include "StrongInlines.h"
+#include "UnlinkedCodeBlock.h"
+
+namespace JSC {
+
+const double CodeCacheMap::workingSetTime = 10.0;
+
+void CodeCacheMap::pruneSlowCase()
+{
+    m_minCapacity = std::max(m_size - m_sizeAtLastPrune, static_cast<int64_t>(0));
+    m_sizeAtLastPrune = m_size;
+    m_timeAtLastPrune = monotonicallyIncreasingTime();
+
+    if (m_capacity < m_minCapacity)
+        m_capacity = m_minCapacity;
+
+    while (m_size > m_capacity || !canPruneQuickly()) {
+        MapType::iterator it = m_map.begin();
+        m_size -= it->key.length();
+        m_map.remove(it);
+    }
+}
+
+CodeCache::CodeCache()
+{
+}
+
+CodeCache::~CodeCache()
+{
+}
+
+template <typename T> struct CacheTypes { };
+
+template <> struct CacheTypes<UnlinkedProgramCodeBlock> {
+    typedef JSC::ProgramNode RootNode;
+    static const SourceCodeKey::CodeType codeType = SourceCodeKey::ProgramType;
+};
+
+template <> struct CacheTypes<UnlinkedEvalCodeBlock> {
+    typedef JSC::EvalNode RootNode;
+    static const SourceCodeKey::CodeType codeType = SourceCodeKey::EvalType;
+};
+
+template <class UnlinkedCodeBlockType, class ExecutableType>
+UnlinkedCodeBlockType* CodeCache::getGlobalCodeBlock(VM& vm, ExecutableType* executable, const SourceCode& source, JSParserBuiltinMode builtinMode,
+    JSParserStrictMode strictMode, ThisTDZMode thisTDZMode, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error, const VariableEnvironment* variablesUnderTDZ)
+{
+    SourceCodeKey key = SourceCodeKey(source, String(), CacheTypes<UnlinkedCodeBlockType>::codeType, builtinMode, strictMode, thisTDZMode);
+    SourceCodeValue* cache = m_sourceCode.findCacheAndUpdateAge(key);
+    bool canCache = debuggerMode == DebuggerOff && profilerMode == ProfilerOff && !vm.typeProfiler() && !vm.controlFlowProfiler();
+    if (cache && canCache) {
+        UnlinkedCodeBlockType* unlinkedCodeBlock = jsCast<UnlinkedCodeBlockType*>(cache->cell.get());
+        unsigned firstLine = source.firstLine() + unlinkedCodeBlock->firstLine();
+        unsigned lineCount = unlinkedCodeBlock->lineCount();
+        unsigned startColumn = unlinkedCodeBlock->startColumn() + source.startColumn();
+        bool endColumnIsOnStartLine = !lineCount;
+        unsigned endColumn = unlinkedCodeBlock->endColumn() + (endColumnIsOnStartLine ? startColumn : 1);
+        executable->recordParse(unlinkedCodeBlock->codeFeatures(), unlinkedCodeBlock->hasCapturedVariables(), firstLine, firstLine + lineCount, startColumn, endColumn);
+        return unlinkedCodeBlock;
+    }
+
+    typedef typename CacheTypes<UnlinkedCodeBlockType>::RootNode RootNode;
+    std::unique_ptr<RootNode> rootNode = parse<RootNode>(
+        &vm, source, Identifier(), builtinMode, strictMode,
+        SourceParseMode::ProgramMode, error, nullptr, ConstructorKind::None, thisTDZMode);
+    if (!rootNode)
+        return nullptr;
+
+    unsigned lineCount = rootNode->lastLine() - rootNode->firstLine();
+    unsigned startColumn = rootNode->startColumn() + 1;
+    bool endColumnIsOnStartLine = !lineCount;
+    unsigned unlinkedEndColumn = rootNode->endColumn();
+    unsigned endColumn = unlinkedEndColumn + (endColumnIsOnStartLine ? startColumn : 1);
+    executable->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), rootNode->firstLine(), rootNode->lastLine(), startColumn, endColumn);
+
+    UnlinkedCodeBlockType* unlinkedCodeBlock = UnlinkedCodeBlockType::create(&vm, executable->executableInfo());
+    unlinkedCodeBlock->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), rootNode->firstLine() - source.firstLine(), lineCount, unlinkedEndColumn);
+
+    auto generator = std::make_unique<BytecodeGenerator>(vm, rootNode.get(), unlinkedCodeBlock, debuggerMode, profilerMode, variablesUnderTDZ);
+    error = generator->generate();
+    if (error.isValid())
+        return nullptr;
+
+    if (!canCache)
+        return unlinkedCodeBlock;
+
+    m_sourceCode.addCache(key, SourceCodeValue(vm, unlinkedCodeBlock, m_sourceCode.age()));
+    return unlinkedCodeBlock;
+}
+
+UnlinkedProgramCodeBlock* CodeCache::getProgramCodeBlock(VM& vm, ProgramExecutable* executable, const SourceCode& source, JSParserBuiltinMode builtinMode, JSParserStrictMode strictMode, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
+{
+    VariableEnvironment emptyParentTDZVariables;
+    return getGlobalCodeBlock<UnlinkedProgramCodeBlock>(vm, executable, source, builtinMode, strictMode, ThisTDZMode::CheckIfNeeded, debuggerMode, profilerMode, error, &emptyParentTDZVariables);
+}
+
+UnlinkedEvalCodeBlock* CodeCache::getEvalCodeBlock(VM& vm, EvalExecutable* executable, const SourceCode& source, JSParserBuiltinMode builtinMode, JSParserStrictMode strictMode, ThisTDZMode thisTDZMode, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error, const VariableEnvironment* variablesUnderTDZ)
+{
+    return getGlobalCodeBlock<UnlinkedEvalCodeBlock>(vm, executable, source, builtinMode, strictMode, thisTDZMode, debuggerMode, profilerMode, error, variablesUnderTDZ);
+}
+
+// FIXME: There's no need to add the function's name to the key here. It's already in the source code.
+UnlinkedFunctionExecutable* CodeCache::getFunctionExecutableFromGlobalCode(VM& vm, const Identifier& name, const SourceCode& source, ParserError& error)
+{
+    SourceCodeKey key = SourceCodeKey(
+        source, name.string(), SourceCodeKey::FunctionType, 
+        JSParserBuiltinMode::NotBuiltin, 
+        JSParserStrictMode::NotStrict);
+    SourceCodeValue* cache = m_sourceCode.findCacheAndUpdateAge(key);
+    if (cache)
+        return jsCast<UnlinkedFunctionExecutable*>(cache->cell.get());
+
+    JSTextPosition positionBeforeLastNewline;
+    std::unique_ptr<ProgramNode> program = parse<ProgramNode>(
+        &vm, source, Identifier(), JSParserBuiltinMode::NotBuiltin,
+        JSParserStrictMode::NotStrict, SourceParseMode::ProgramMode,
+        error, &positionBeforeLastNewline);
+    if (!program) {
+        RELEASE_ASSERT(error.isValid());
+        return nullptr;
+    }
+
+    // This function assumes an input string that would result in a single function declaration.
+    StatementNode* statement = program->singleStatement();
+    ASSERT(statement);
+    ASSERT(statement->isBlock());
+    if (!statement || !statement->isBlock())
+        return nullptr;
+
+    StatementNode* funcDecl = static_cast<BlockNode*>(statement)->singleStatement();
+    ASSERT(funcDecl);
+    ASSERT(funcDecl->isFuncDeclNode());
+    if (!funcDecl || !funcDecl->isFuncDeclNode())
+        return nullptr;
+
+    FunctionMetadataNode* metadata = static_cast<FuncDeclNode*>(funcDecl)->metadata();
+    ASSERT(metadata);
+    if (!metadata)
+        return nullptr;
+    
+    metadata->setEndPosition(positionBeforeLastNewline);
+    // The Function constructor only has access to global variables, so no variables will be under TDZ.
+    VariableEnvironment emptyTDZVariables;
+    UnlinkedFunctionExecutable* functionExecutable = UnlinkedFunctionExecutable::create(&vm, source, metadata, UnlinkedNormalFunction, ConstructAbility::CanConstruct, emptyTDZVariables);
+    functionExecutable->m_nameValue.set(vm, functionExecutable, jsString(&vm, name.string()));
+
+    m_sourceCode.addCache(key, SourceCodeValue(vm, functionExecutable, m_sourceCode.age()));
+    return functionExecutable;
+}
+
+}