Changeset 58317 in webkit for trunk/JavaScriptCore/runtime/StringConstructor.cpp

Timestamp:

Apr 27, 2010, 11:17:35 AM (15 years ago)

Author:

[email protected]

Message:

2010-04-26 Oliver Hunt <​[email protected]>

Reviewed by Maciej Stachowiak.

Add specialized thunks for a char code related string functions
​https://bugs.webkit.org/show_bug.cgi?id=38177

This is a simple extension to my prior patch. Basically hoist the
existing character loading logic from the charCodeAt thunk and into
a helper function, then add a helper to load strings from the small
string cache. This allows trivial implementations of fromCharCode
and charAt.

• create_hash_table:
• jit/SpecializedThunkJIT.h: (JSC::SpecializedThunkJIT::returnJSCell): (JSC::SpecializedThunkJIT::tagReturnAsJSCell):
• jit/ThunkGenerators.cpp: (JSC::stringCharLoad): (JSC::charToString): (JSC::charCodeAtThunkGenerator): (JSC::charAtThunkGenerator): (JSC::fromCharCodeThunkGenerator):
• jit/ThunkGenerators.h:
• runtime/SmallStrings.h: (JSC::SmallStrings::singleCharacterStrings):
• runtime/StringConstructor.cpp: (JSC::StringConstructor::StringConstructor):

File:

• trunk/JavaScriptCore/runtime/StringConstructor.cpp (modified) (1 diff)

trunk/JavaScriptCore/runtime/StringConstructor.cpp

@@ -55 +55 @@
 
     // ECMA 15.5.3.2 fromCharCode()
+#if ENABLE(JIT)
+    putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, prototypeFunctionStructure, 1, exec->propertyNames().fromCharCode, exec->globalData().getThunk(fromCharCodeThunkGenerator), stringFromCharCode), DontEnum);
+#else
     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, prototypeFunctionStructure, 1, exec->propertyNames().fromCharCode, stringFromCharCode), DontEnum);
-
+#endif
     // no. of arguments for constructor
     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);