Changeset 43642 in webkit for trunk/JavaScriptCore/parser/ParserArena.h

Timestamp:

May 13, 2009, 11:14:48 AM (16 years ago)

Author:

Darin Adler

Message:

JavaScriptCore:

2009-05-13 Darin Adler <Darin Adler>

Reviewed by Cameron Zwarich.

Bug 25674: syntax tree nodes should use arena allocation
​https://bugs.webkit.org/show_bug.cgi?id=25674

Step 3: Add some actual arena allocation. About 1% SunSpider speedup.

• JavaScriptCore.exp: Updated.

• bytecompiler/BytecodeGenerator.cpp: (JSC::BytecodeGenerator::BytecodeGenerator): Updated since VarStack contains const Identifier* now. (JSC::BytecodeGenerator::emitPushNewScope): Updated to take a const Identifier&.
• bytecompiler/BytecodeGenerator.h: Ditto

• bytecompiler/SegmentedVector.h: Added isEmpty.

• debugger/Debugger.cpp: (JSC::Debugger::recompileAllJSFunctions): Moved this function here from WebCore so WebCore doesn't need the details of FunctionBodyNode.
• debugger/Debugger.h: Ditto.

• interpreter/Interpreter.cpp: (JSC::Interpreter::execute): Updated since VarStack contains const Identifier* now.

• jit/JITStubs.cpp: (JSC::JITStubs::cti_vm_lazyLinkCall): Call isHostFunction on the body rather than on the function object, since we can't easily have inlined access to the FunctionBodyNode in JSFunction.h since WebCore needs access to that header. (JSC::JITStubs::cti_op_construct_JSConstruct): Ditto.
• profiler/Profiler.cpp: (JSC::Profiler::createCallIdentifier): Ditto.

• parser/Grammar.y: Use JSGlobalData* to pass the global data pointer around whenever possible instead of using void*. Changed SET_EXCEPTION_LOCATION from a macro to an inline function. Marked the structure-creating functions inline. Changed the VarStack to use identifier pointers instead of actual identifiers. This takes advantage of the fact that all identifier pointers come from the arena and avoids referenc count churn. Changed Identifier* to const Identifier* to make sure we don't modify any by accident. Used identifiers for regular expression strings too, using the new scanRegExp that has out parameters instead of the old one that relied on side effects in the Lexer. Move the creation of numeric identifiers out of this file and into the PropertyNode constructor.

• parser/Lexer.cpp: (JSC::Lexer::setCode): Pass in ParserArena, used for identifiers. (JSC::Lexer::makeIdentifier): Changed return type to const Identifier* and changed to call ParserArena. (JSC::Lexer::scanRegExp): Added out arguments that are const Identifier* as well as a prefix character argument so we can handle the /= case without a string append. (JSC::Lexer::skipRegExp): Added. Skips a regular expression without allocating Identifier objects. (JSC::Lexer::clear): Removed the code to manage m_identifiers, m_pattern, and m_flags, and added code to set m_arena to 0.
• parser/Lexer.h: Updated for changes above.

• parser/NodeConstructors.h: (JSC::ParserArenaFreeable::operator new): Added. Calls allocateFreeable on the arena. (JSC::ParserArenaDeletable::operator new): Changed to call the allocateDeletable function on the arena instead of deleteWithArena. (JSC::RegExpNode::RegExpNode): Changed arguments to Identifier instead of UString since these come from the parser which makes identifiers. (JSC::PropertyNode::PropertyNode): Added new constructor that makes numeric identifiers. Some day we might want to optimize this for integers so it doesn't create a string for each one. (JSC::ContinueNode::ContinueNode): Initialize m_ident to nullIdentifier since it's now a const Identifier& so it can't be left uninitialized. (JSC::BreakNode::BreakNode): Ditto. (JSC::CaseClauseNode::CaseClauseNode): Updated to use SourceElements* to keep track of the statements rather than a separate statement vector. (JSC::BlockNode::BlockNode): Ditto. (JSC::ForInNode::ForInNode): Initialize m_ident to nullIdentifier.

• parser/Nodes.cpp: Moved the comment explaining emitBytecode in here. It seemed strangely out of place in the header. (JSC::ThrowableExpressionData::emitThrowError): Added an overload for UString as well as Identifier. (JSC::SourceElements::singleStatement): Added. (JSC::SourceElements::lastStatement): Added. (JSC::RegExpNode::emitBytecode): Updated since the pattern and flags are now Identifier instead of UString. Also changed the throwError code to use the substitution mechanism instead of doing a string append. (JSC::SourceElements::emitBytecode): Added. Replaces the old statementListEmitCode function, since we now keep the SourceElements objects around. (JSC::BlockNode::lastStatement): Added. (JSC::BlockNode::emitBytecode): Changed to use emitBytecode instead of statementListEmitCode. (JSC::CaseClauseNode::emitBytecode): Added. (JSC::CaseBlockNode::emitBytecodeForBlock): Changed to use emitBytecode instead of statementListEmitCode. (JSC::ScopeNodeData::ScopeNodeData): Changed to store the SourceElements* instead of using releaseContentsIntoVector. (JSC::ScopeNode::emitStatementsBytecode): Added. (JSC::ScopeNode::singleStatement): Added. (JSC::ProgramNode::emitBytecode): Call emitStatementsBytecode instead of statementListEmitCode. (JSC::EvalNode::emitBytecode): Ditto. (JSC::EvalNode::generateBytecode): Removed code to clear the children vector. This optimization is no longer possible since everything is in a single arena. (JSC::FunctionBodyNode::emitBytecode): Call emitStatementsBytecode insetad of statementListEmitCode and check for the return node using the new functions.

• parser/Nodes.h: Changed VarStack to store const Identifier* instead of Identifier and rely on the arena to control lifetime. Added a new ParserArenaFreeable class. Made ParserArenaDeletable inherit from FastAllocBase instead of having its own operator new. Base the Node class on ParserArenaFreeable. Changed the various Node classes to use const Identifier& instead of Identifier to avoid the need to call their destructors and allow them to function as "freeable" in the arena. Removed extraneous JSC_FAST_CALL on definitions of inline functions. Changed ElementNode, PropertyNode, ArgumentsNode, ParameterNode, CaseClauseNode, ClauseListNode, and CaseBlockNode to use ParserArenaFreeable as a base class since they do not descend from Node. Eliminated the StatementVector type and instead have various classes use SourceElements* instead of StatementVector. This prevents those classes from having th use ParserArenaDeletable to make sure the vector destructor is called.

• parser/Parser.cpp: (JSC::Parser::parse): Pass the arena to the lexer.

• parser/Parser.h: Added an include of ParserArena.h, which is no longer included by Nodes.h.

• parser/ParserArena.cpp: (JSC::ParserArena::ParserArena): Added. Initializes the new members, m_freeableMemory, m_freeablePoolEnd, and m_identifiers. (JSC::ParserArena::freeablePool): Added. Computes the pool pointer, since we store only the current pointer and the end of pool pointer. (JSC::ParserArena::deallocateObjects): Added. Contains the common memory-deallocation logic used by both the destructor and the reset function. (JSC::ParserArena::~ParserArena): Changed to call deallocateObjects. (JSC::ParserArena::reset): Ditto. Also added code to zero out the new structures, and switched to use clear() instead of shrink(0) since we don't really reuse arenas. (JSC::ParserArena::makeNumericIdentifier): Added. (JSC::ParserArena::allocateFreeablePool): Added. Used when the pool is empty. (JSC::ParserArena::isEmpty): Added. No longer inline, which is fine since this is used only for assertions at the moment.

• parser/ParserArena.h: Added an actual arena of "freeable" objects, ones that don't need destructors to be called. Also added the segmented vector of identifiers that used to be in the Lexer.

• runtime/FunctionConstructor.cpp: (JSC::extractFunctionBody): Use singleStatement function rather than getting at a StatementVector.

• runtime/FunctionPrototype.cpp: (JSC::functionProtoFuncToString): Call isHostFunction on the body rather than the function object.

• runtime/JSFunction.cpp: (JSC::JSFunction::JSFunction): Moved the structure version of this in here from the header. It's not hot enough that it needs to be inlined. (JSC::JSFunction::isHostFunction): Moved this in here from the header. It's now a helper to be used only within the class. (JSC::JSFunction::setBody): Moved this in here. It's not hot enough that it needs to be inlined, and we want to be able to compile the header without the definition of FunctionBodyNode.

• runtime/JSFunction.h: Eliminated the include of "Nodes.h". This was exposing too much JavaScriptCore dependency to WebCore. Because of this change and some changes made to WebCore, we could now export a lot fewer headers from JavaScriptCore, but I have not done that yet in this check-in. Made a couple functions non-inline. Removes some isHostFunction() assertions.

• wtf/FastAllocBase.h: Added the conventional using statements we use in WTF so we can use identifiers from the WTF namespace without explicit namespace qualification or namespace directive. This is the usual WTF style, although it's unconventional in the C++ world. We use the namespace primarily for link-time disambiguation, not compile-time.

• wtf/FastMalloc.cpp: Fixed an incorrect comment.

WebCore:

2009-05-13 Darin Adler <Darin Adler>

Reviewed by Cameron Zwarich.

Bug 25674: syntax tree nodes should use arena allocation
​https://bugs.webkit.org/show_bug.cgi?id=25674

• bindings/js/JSDOMBinding.h: Removed include of JSFunction.h. We don't want the entire DOM binding to depend on that file.

• bindings/js/JSAudioConstructor.cpp: Added include of Error.h. Before we inherited this automatically because JDDOMBinding.h included JSFunction.h, but that was excessive.
• bindings/js/JSDOMWindowCustom.cpp: Ditto.
• bindings/js/JSHTMLInputElementCustom.cpp: Ditto.
• bindings/js/JSImageConstructor.cpp: Ditto.
• bindings/js/JSLazyEventListener.cpp: Ditto, but for JSFunction.h.
• bindings/js/JSMessageChannelConstructor.cpp: Ditto.
• bindings/js/JSOptionConstructor.cpp: Ditto.
• bindings/js/JSWorkerConstructor.cpp: Ditto.
• bindings/js/JSXMLHttpRequestConstructor.cpp: Ditto.
• bridge/jni/jni_jsobject.mm: Ditto, but for SourceCode.h.
• inspector/InspectorController.cpp: Ditto.

• inspector/JavaScriptDebugServer.cpp: (WebCore::JavaScriptDebugServer::recompileAllJSFunctions): Moved mose of this function into the base class in JavaScriptCore, so the details of compilation don't have to be exposed.

WebKit/mac:

2009-05-13 Darin Adler <Darin Adler>

Reviewed by Cameron Zwarich.

Bug 25674: syntax tree nodes should use arena allocation
​https://bugs.webkit.org/show_bug.cgi?id=25674

• Plugins/Hosted/NetscapePluginInstanceProxy.mm: Updated includes. New ones needed due to reducing includes of JSDOMBinding.h.
• WebView/WebScriptDebugger.mm: Ditto.

File:

• trunk/JavaScriptCore/parser/ParserArena.h (modified) (2 diffs)

trunk/JavaScriptCore/parser/ParserArena.h

@@ -27 +27 @@
 #define ParserArena_h
 
-#include <wtf/PassRefPtr.h>
-#include <wtf/RefPtr.h>
-#include <wtf/Vector.h>
+#include "Identifier.h"
+#include "SegmentedVector.h"
 
 namespace JSC {
@@ -36 +35 @@
     class ParserArenaRefCounted;
 
-    class ParserArena {
+    typedef SegmentedVector<Identifier, 64> IdentifierArena;
+
+    class ParserArena : Noncopyable {
     public:
+        ParserArena();
+        ~ParserArena();
+
         void swap(ParserArena& otherArena)
         {
+            std::swap(m_freeableMemory, otherArena.m_freeableMemory);
+            std::swap(m_freeablePoolEnd, otherArena.m_freeablePoolEnd);
+            m_identifierArena.swap(otherArena.m_identifierArena);
+            m_freeablePools.swap(otherArena.m_freeablePools);
             m_deletableObjects.swap(otherArena.m_deletableObjects);
             m_refCountedObjects.swap(otherArena.m_refCountedObjects);
         }
-        ~ParserArena();
 
-        void deleteWithArena(ParserArenaDeletable* object) { m_deletableObjects.append(object); }
+        void* allocateFreeable(size_t size)
+        {
+            ASSERT(size);
+            ASSERT(size <= freeablePoolSize);
+            size_t alignedSize = alignSize(size);
+            ASSERT(alignedSize <= freeablePoolSize);
+            if (UNLIKELY(static_cast<size_t>(m_freeablePoolEnd - m_freeableMemory) < alignedSize))
+                allocateFreeablePool();
+            void* block = m_freeableMemory;
+            m_freeableMemory += alignedSize;
+            return block;
+        }
+
+        void* allocateDeletable(size_t size)
+        {
+            ParserArenaDeletable* deletable = static_cast<ParserArenaDeletable*>(fastMalloc(size));
+            m_deletableObjects.append(deletable);
+            return deletable;
+        }
+
         void derefWithArena(PassRefPtr<ParserArenaRefCounted> object) { m_refCountedObjects.append(object); }
-
         bool contains(ParserArenaRefCounted*) const;
         ParserArenaRefCounted* last() const;
         void removeLast();
 
-        bool isEmpty() const { return m_deletableObjects.isEmpty() && m_refCountedObjects.isEmpty(); }
+        bool isEmpty() const;
         void reset();
 
+        const Identifier& makeIdentifier(JSGlobalData*, const UChar* character, size_t length);
+        const Identifier& makeNumericIdentifier(JSGlobalData*, double number);
+
+        IdentifierArena& identifierArena() { return *m_identifierArena; }
+
     private:
+        static const size_t freeablePoolSize = 8000;
+
+        static size_t alignSize(size_t size)
+        {
+            return (size + sizeof(WTF::AllocAlignmentInteger) - 1) & ~(sizeof(WTF::AllocAlignmentInteger) - 1);
+        }
+
+        void* freeablePool();
+        void allocateFreeablePool();
+        void deallocateObjects();
+
+        char* m_freeableMemory;
+        char* m_freeablePoolEnd;
+
+        OwnPtr<IdentifierArena> m_identifierArena;
+        Vector<void*> m_freeablePools;
         Vector<ParserArenaDeletable*> m_deletableObjects;
         Vector<RefPtr<ParserArenaRefCounted> > m_refCountedObjects;
     };
 
+    ALWAYS_INLINE const Identifier& makeIdentifier(IdentifierArena& arena, JSGlobalData* globalData, const UChar* characters, size_t length)
+    {
+        arena.append(Identifier(globalData, characters, length));
+        return arena.last();
+    }
+
+    ALWAYS_INLINE const Identifier& ParserArena::makeIdentifier(JSGlobalData* globalData, const UChar* characters, size_t length)
+    {
+        return JSC::makeIdentifier(*m_identifierArena, globalData, characters, length);
+    }
+
 }