Changeset 96983 in webkit for trunk/Source/JavaScriptCore/runtime

Timestamp:

Oct 7, 2011, 3:11:51 PM (14 years ago)

Author:

[email protected]

Message:

Support string indexing in the DFG
​https://bugs.webkit.org/show_bug.cgi?id=69671

Reviewed by Gavin Barraclough.

Emit code to support inline indexing of strings

• dfg/DFGSpeculativeJIT.cpp:

(JSC::DFG::SpeculativeJIT::compileGetByValOnString):

Shared code to perform string indexing.

• dfg/DFGSpeculativeJIT.h:
• dfg/DFGSpeculativeJIT32_64.cpp:

(JSC::DFG::SpeculativeJIT::compile):

• dfg/DFGSpeculativeJIT64.cpp:

(JSC::DFG::SpeculativeJIT::compile):

Use compileGetByValOnString if we predict that the base object
is a string in GetByVal.

• runtime/JSString.h:

(JSC::JSString::offsetOfFiberCount):
(JSC::JSString::offsetOfValue):

File:

• trunk/Source/JavaScriptCore/runtime/JSString.h (modified) (1 diff)

trunk/Source/JavaScriptCore/runtime/JSString.h

@@ -448 +448 @@
 
         static size_t offsetOfLength() { return OBJECT_OFFSETOF(JSString, m_length); }
+        static size_t offsetOfFiberCount() { return OBJECT_OFFSETOF(JSString, m_fiberCount); }
+        static size_t offsetOfValue() { return OBJECT_OFFSETOF(JSString, m_value); }
 
         static const ClassInfo s_info;