https://bugs.webkit.org/show_bug.cgi?id=119962

Source/JavaScriptCore: 

Reviewed by Oliver Hunt.
        
This adds a new node, GetTypedArrayByteOffset, which inlines
typedArray.byteOffset.
        
Also, I improved a bunch of the clobbering logic related to typed arrays
and clobbering in general. For example, PutByOffset/PutStructure are not
clobber-world so they can be handled by most default cases in CSE. Also,
It's better to use the 'Class_field' notation for typed arrays now that
they no longer involve magical descriptor thingies.

* bytecode/SpeculatedType.h:
* dfg/DFGAbstractHeap.h:
* dfg/DFGAbstractInterpreterInlines.h:
(JSC::DFG::::executeEffects):
* dfg/DFGArrayMode.h:
(JSC::DFG::neverNeedsStorage):
* dfg/DFGCSEPhase.cpp:
(JSC::DFG::CSEPhase::getByValLoadElimination):
(JSC::DFG::CSEPhase::getByOffsetLoadElimination):
(JSC::DFG::CSEPhase::getPropertyStorageLoadElimination):
(JSC::DFG::CSEPhase::checkArrayElimination):
(JSC::DFG::CSEPhase::getIndexedPropertyStorageLoadElimination):
(JSC::DFG::CSEPhase::getTypedArrayByteOffsetLoadElimination):
(JSC::DFG::CSEPhase::performNodeCSE):
* dfg/DFGClobberize.h:
(JSC::DFG::clobberize):
* dfg/DFGFixupPhase.cpp:
(JSC::DFG::FixupPhase::fixupNode):
(JSC::DFG::FixupPhase::attemptToMakeGetTypedArrayByteLength):
(JSC::DFG::FixupPhase::convertToGetArrayLength):
(JSC::DFG::FixupPhase::attemptToMakeGetTypedArrayByteOffset):
* dfg/DFGNodeType.h:
* dfg/DFGPredictionPropagationPhase.cpp:
(JSC::DFG::PredictionPropagationPhase::propagate):
* dfg/DFGSafeToExecute.h:
(JSC::DFG::safeToExecute):
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileGetTypedArrayByteOffset):
* dfg/DFGSpeculativeJIT.h:
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGSpeculativeJIT64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGTypeCheckHoistingPhase.cpp:
(JSC::DFG::TypeCheckHoistingPhase::identifyRedundantStructureChecks):
* runtime/ArrayBuffer.h:
(JSC::ArrayBuffer::offsetOfData):
* runtime/Butterfly.h:
(JSC::Butterfly::offsetOfArrayBuffer):
* runtime/IndexingHeader.h:
(JSC::IndexingHeader::offsetOfArrayBuffer):

LayoutTests: 

Reviewed by Oliver Hunt.

* fast/js/dfg-byteOffset-neuter.html: Added.
* fast/js/dfg-byteOffset-neuter-expected.txt: Added.
* fast/js/regress/ArrayBuffer-Int32Array-byteOffset-expected.txt: Added.
* fast/js/regress/ArrayBuffer-Int32Array-byteOffset.html: Added.
* fast/js/regress/script-tests/ArrayBuffer-Int32Array-byteOffset.js: Added.
* fast/js/script-tests/dfg-byteOffset-neuter.js: Added.
(foo):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154305 268f45cc-cd09-0410-ab3c-d52691b4dbfc