2009-02-13  Geoffrey Garen  <ggaren@apple.com>

        Reviewed by Darin Adler.
        
        Fixed <rdar://problem/6584057> Optimize sort by JS numeric comparison
        function not to run the comparison function
        
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::CodeBlock):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::setIsNumericCompareFunction):
        (JSC::CodeBlock::isNumericCompareFunction): Added the ability to track
        whether a CodeBlock performs a sort-like numeric comparison.

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::generate): Set the isNumericCompareFunction bit
        after compiling.

        * parser/Nodes.cpp:
        (JSC::FunctionBodyNode::emitBytecode): Fixed a bug that caused us to
        codegen an extra return at the end of all functions (eek!), since this
        made it harder / weirder to detect the numeric comparison pattern in
        bytecode.

        * runtime/ArrayPrototype.cpp:
        (JSC::arrayProtoFuncSort): Use the isNumericCompareFunction bit to do
        a faster sort if we can.

        * runtime/FunctionConstructor.cpp:
        (JSC::extractFunctionBody):
        (JSC::constructFunction):
        * runtime/FunctionConstructor.h: Renamed and exported extractFunctionBody for
        use in initializing lazyNumericCompareFunction.

        * runtime/JSArray.cpp:
        (JSC::compareNumbersForQSort):
        (JSC::compareByStringPairForQSort):
        (JSC::JSArray::sortNumeric):
        (JSC::JSArray::sort):
        * runtime/JSArray.h: Added a fast numeric sort. Renamed ArrayQSortPair
        to be more specific since we do different kinds of qsort now.

        * runtime/JSGlobalData.cpp:
        (JSC::JSGlobalData::JSGlobalData):
        (JSC::JSGlobalData::numericCompareFunction):
        (JSC::JSGlobalData::ClientData::~ClientData):
        * runtime/JSGlobalData.h: Added helper data for computing the
        isNumericCompareFunction bit.

LayoutTests:

2009-02-13  Geoffrey Garen  <ggaren@apple.com>

        Reviewed by Sam Weinig.
        
        Added a test for an edge case in <rdar://problem/6584057>.

        * fast/js/resources/sort-non-numbers.js: Added.
        * fast/js/sort-non-numbers.html: Added.
        * fast/js/sort-non-numbers-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@40993 268f45cc-cd09-0410-ab3c-d52691b4dbfc