Changeset 36316 in webkit for trunk/JavaScriptCore/kjs/JSGlobalObject.h

Timestamp:

Sep 10, 2008, 1:42:43 AM (17 years ago)

Author:

[email protected]

Message:

2008-09-10 Maciej Stachowiak <​[email protected]>

Reviewed by Oliver.

• enable polymorphic inline caching of properties of primitives

1.012x speedup on SunSpider.

We create special structure IDs for JSString and
JSNumberCell. Unlike normal structure IDs, these cannot hold the
true prototype. Due to JS autoboxing semantics, the prototype used
when looking up string or number properties depends on the lexical
global object of the call site, not the creation site. Thus we
enable StructureIDs to handle this quirk for primitives.

Everything else should be straightforward.

• VM/CTI.cpp: (JSC::CTI::privateCompileGetByIdProto): (JSC::CTI::privateCompileGetByIdChain):
• VM/CTI.h: (JSC::CTI::compileGetByIdProto): (JSC::CTI::compileGetByIdChain):
• VM/JSPropertyNameIterator.h: (JSC::JSPropertyNameIterator::JSPropertyNameIterator):
• VM/Machine.cpp: (JSC::Machine::Machine): (JSC::cachePrototypeChain): (JSC::Machine::tryCachePutByID): (JSC::Machine::tryCacheGetByID): (JSC::Machine::privateExecute): (JSC::Machine::tryCTICachePutByID): (JSC::Machine::tryCTICacheGetByID):
• kjs/GetterSetter.h: (JSC::GetterSetter::GetterSetter):
• kjs/JSCell.h:
• kjs/JSGlobalData.cpp: (JSC::JSGlobalData::JSGlobalData):
• kjs/JSGlobalData.h:
• kjs/JSGlobalObject.h: (JSC::StructureID::prototypeForLookup):
• kjs/JSNumberCell.h: (JSC::JSNumberCell::JSNumberCell): (JSC::jsNumberCell):
• kjs/JSObject.h: (JSC::JSObject::prototype):
• kjs/JSString.cpp: (JSC::jsString): (JSC::jsSubstring): (JSC::jsOwnedString):
• kjs/JSString.h: (JSC::JSString::JSString): (JSC::JSString::): (JSC::jsSingleCharacterString): (JSC::jsSingleCharacterSubstring): (JSC::jsNontrivialString):
• kjs/SmallStrings.cpp: (JSC::SmallStrings::createEmptyString): (JSC::SmallStrings::createSingleCharacterString):
• kjs/StructureID.cpp: (JSC::StructureID::StructureID): (JSC::StructureID::addPropertyTransition): (JSC::StructureID::getterSetterTransition): (JSC::StructureIDChain::StructureIDChain):
• kjs/StructureID.h: (JSC::StructureID::create): (JSC::StructureID::storedPrototype):

File:

• trunk/JavaScriptCore/kjs/JSGlobalObject.h (modified) (2 diffs)

trunk/JavaScriptCore/kjs/JSGlobalObject.h

@@ -25 +25 @@
 #include "JSGlobalData.h"
 #include "JSVariableObject.h"
+#include "NumberPrototype.h"
+#include "StringPrototype.h"
 #include <wtf/HashSet.h>
 #include <wtf/OwnPtr.h>
@@ -294 +296 @@
     }
 
+    inline JSValue* StructureID::prototypeForLookup(ExecState* exec) {
+        if (m_type == ObjectType)
+            return m_prototype;
+
+        if (m_type == StringType)
+            return exec->lexicalGlobalObject()->stringPrototype();
+
+        ASSERT(m_type == NumberType);
+        return exec->lexicalGlobalObject()->numberPrototype();
+    }
+
 } // namespace JSC