Changeset 46879 in webkit for trunk/JavaScriptCore/wtf/PtrAndFlags.h

Timestamp:

Aug 6, 2009, 8:05:42 PM (16 years ago)

Author:

[email protected]

Message:

2009-08-06 Gavin Barraclough <​[email protected]>

Reviewed by Oliver Hunt.

Make get_by_id/put_by_id/method_check/call defer optimization using a data flag rather than a code modification.
( ​https://bugs.webkit.org/show_bug.cgi?id=27635 )

This improves performance of ENABLE(ASSEMBLER_WX_EXCLUSIVE) builds by 2-2.5%, reducing the overhead to about 2.5%.
(No performance impact with ASSEMBLER_WX_EXCLUSIVE disabled).

• bytecode/CodeBlock.cpp: (JSC::printStructureStubInfo):
  • Make StructureStubInfo store the type as an integer, rather than an OpcodeID.

• bytecode/CodeBlock.h: (JSC::): (JSC::CallLinkInfo::seenOnce): (JSC::CallLinkInfo::setSeen): (JSC::MethodCallLinkInfo::seenOnce): (JSC::MethodCallLinkInfo::setSeen):
  • Change a pointer in CallLinkInfo/MethodCallLinkInfo to use a PtrAndFlags, use a flag to track when an op has been executed once.

• bytecode/StructureStubInfo.cpp: (JSC::StructureStubInfo::deref):
  • Make StructureStubInfo store the type as an integer, rather than an OpcodeID.

• bytecode/StructureStubInfo.h: (JSC::StructureStubInfo::StructureStubInfo): (JSC::StructureStubInfo::initGetByIdSelf): (JSC::StructureStubInfo::initGetByIdProto): (JSC::StructureStubInfo::initGetByIdChain): (JSC::StructureStubInfo::initGetByIdSelfList): (JSC::StructureStubInfo::initGetByIdProtoList): (JSC::StructureStubInfo::initPutByIdTransition): (JSC::StructureStubInfo::initPutByIdReplace): (JSC::StructureStubInfo::seenOnce): (JSC::StructureStubInfo::setSeen):
  • Make StructureStubInfo store the type as an integer, rather than an OpcodeID, add a flag to track when an op has been executed once.

• bytecompiler/BytecodeGenerator.cpp: (JSC::BytecodeGenerator::emitGetById): (JSC::BytecodeGenerator::emitPutById):
  • Make StructureStubInfo store the type as an integer, rather than an OpcodeID.

• jit/JIT.cpp: (JSC::JIT::privateCompileCTIMachineTrampolines): (JSC::JIT::unlinkCall):
  • Remove the "don't lazy link" stage of calls.

• jit/JIT.h: (JSC::JIT::compileCTIMachineTrampolines):
  • Remove the "don't lazy link" stage of calls.

• jit/JITCall.cpp: (JSC::JIT::compileOpCallSlowCase):
  • Remove the "don't lazy link" stage of calls.

• jit/JITStubs.cpp: (JSC::JITThunks::JITThunks): (JSC::JITThunks::tryCachePutByID): (JSC::JITThunks::tryCacheGetByID): (JSC::JITStubs::DEFINE_STUB_FUNCTION): (JSC::JITStubs::getPolymorphicAccessStructureListSlot):
  • Remove the "don't lazy link" stage of calls, and the "_second" stage of get_by_id/put_by_id/method_check.

• jit/JITStubs.h: (JSC::JITThunks::ctiStringLengthTrampoline): (JSC::JITStubs::):
  • Remove the "don't lazy link" stage of calls, and the "_second" stage of get_by_id/put_by_id/method_check.

• wtf/PtrAndFlags.h: (WTF::PtrAndFlags::PtrAndFlags): (WTF::PtrAndFlags::operator!): (WTF::PtrAndFlags::operator->):
  • Add ! and -> operators, add constuctor with pointer argument.

File:

• trunk/JavaScriptCore/wtf/PtrAndFlags.h (modified) (2 diffs)

trunk/JavaScriptCore/wtf/PtrAndFlags.h

@@ -38 +38 @@
     public:
         PtrAndFlags() : m_ptrAndFlags(0) {}
+        PtrAndFlags(T* ptr) : m_ptrAndFlags(0) { set(ptr); }
 
         bool isFlagSet(FlagEnum flagNumber) const { ASSERT(flagNumber < 2); return m_ptrAndFlags & (1 << flagNumber); }
@@ -52 +53 @@
         }
 
+        bool operator!() const { return !get(); }
+        T* operator->() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); }
+
     private:
         intptr_t m_ptrAndFlags;