Changeset 46879 in webkit for trunk/JavaScriptCore/bytecode/StructureStubInfo.cpp

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/bytecode/StructureStubInfo.cpp (modified) (3 diffs)

trunk/JavaScriptCore/bytecode/StructureStubInfo.cpp

@@ -32 +32 @@
 void StructureStubInfo::deref()
 {
-    switch (opcodeID) {
-    case op_get_by_id_self:
+    switch (accessType) {
+    case access_get_by_id_self:
         u.getByIdSelf.baseObjectStructure->deref();
         return;
-    case op_get_by_id_proto:
+    case access_get_by_id_proto:
         u.getByIdProto.baseObjectStructure->deref();
         u.getByIdProto.prototypeStructure->deref();
         return;
-    case op_get_by_id_chain:
+    case access_get_by_id_chain:
         u.getByIdChain.baseObjectStructure->deref();
         u.getByIdChain.chain->deref();
         return;
-    case op_get_by_id_self_list: {
+    case access_get_by_id_self_list: {
         PolymorphicAccessStructureList* polymorphicStructures = u.getByIdSelfList.structureList;
         polymorphicStructures->derefStructures(u.getByIdSelfList.listSize);
@@ -50 +50 @@
         return;
     }
-    case op_get_by_id_proto_list: {
+    case access_get_by_id_proto_list: {
         PolymorphicAccessStructureList* polymorphicStructures = u.getByIdProtoList.structureList;
         polymorphicStructures->derefStructures(u.getByIdProtoList.listSize);
@@ -56 +56 @@
         return;
     }
-    case op_put_by_id_transition:
+    case access_put_by_id_transition:
         u.putByIdTransition.previousStructure->deref();
         u.putByIdTransition.structure->deref();
         u.putByIdTransition.chain->deref();
         return;
-    case op_put_by_id_replace:
+    case access_put_by_id_replace:
         u.putByIdReplace.baseObjectStructure->deref();
         return;
-    case op_get_by_id:
-    case op_put_by_id:
-    case op_get_by_id_generic:
-    case op_put_by_id_generic:
-    case op_get_array_length:
-    case op_get_string_length:
+    case access_get_by_id:
+    case access_put_by_id:
+    case access_get_by_id_generic:
+    case access_put_by_id_generic:
+    case access_get_array_length:
+    case access_get_string_length:
         // These instructions don't ref their Structures.
         return;