https://bugs.webkit.org/show_bug.cgi?id=72563

Reviewed by Geoff Garen.
        
CodeBlock::m_dfgData now tracks weak references and weak reference transitions
(like ephemerons) generated by the DFG. The DFG makes sure to notify the
CodeBlock of all uses of weak references and weak reference transitions.
CodeBlock currently marks them strongly, since the weak marking logic is not
in place, yet.

* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::visitAggregate):
(JSC::CodeBlock::stronglyVisitWeakReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::appendWeakReference):
(JSC::CodeBlock::shrinkWeakReferencesToFit):
(JSC::CodeBlock::appendWeakReferenceTransition):
(JSC::CodeBlock::shrinkWeakReferenceTransitionsToFit):
(JSC::CodeBlock::WeakReferenceTransition::WeakReferenceTransition):
* bytecode/CodeOrigin.h:
(JSC::CodeOrigin::codeOriginOwner):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::handleCall):
(JSC::DFG::ByteCodeParser::handleInlining):
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGJITCompiler.cpp:
(JSC::DFG::JITCompiler::link):
* dfg/DFGJITCompiler.h:
(JSC::DFG::JITCompiler::addWeakReference):
(JSC::DFG::JITCompiler::addWeakReferenceTransition):
(JSC::DFG::JITCompiler::branchWeakPtr):
* dfg/DFGSpeculativeJIT.h:
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGSpeculativeJIT64.cpp:
(JSC::DFG::SpeculativeJIT::fillJSValue):
(JSC::DFG::SpeculativeJIT::compile):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@100527 268f45cc-cd09-0410-ab3c-d52691b4dbfc