https://bugs.webkit.org/show_bug.cgi?id=85269

Source/JavaScriptCore: 

Reviewed by Oliver Hunt.
        
Merged r115754 from dfgopt.
        
Implements a naive dominator calculator, which is currently just used to
print information in graph dumps. I've enabled it by default mainly to
be able to track its performance impact. So far it appears that there is
none, which is unsurprising given that the number of basic blocks in most
procedures is small.
        
Also tweaked bytecode dumping to reveal more useful information about the
nature of the code block.

* CMakeLists.txt:
* GNUmakefile.list.am:
* JavaScriptCore.xcodeproj/project.pbxproj:
* Target.pri:
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dump):
* dfg/DFGDominators.cpp: Added.
(DFG):
(JSC::DFG::Dominators::Dominators):
(JSC::DFG::Dominators::~Dominators):
(JSC::DFG::Dominators::compute):
(JSC::DFG::Dominators::iterateForBlock):
* dfg/DFGDominators.h: Added.
(DFG):
(Dominators):
(JSC::DFG::Dominators::invalidate):
(JSC::DFG::Dominators::computeIfNecessary):
(JSC::DFG::Dominators::isValid):
(JSC::DFG::Dominators::dominates):
* dfg/DFGDriver.cpp:
(JSC::DFG::compile):
* dfg/DFGGraph.cpp:
(JSC::DFG::Graph::dump):
* dfg/DFGGraph.h:
(Graph):

Source/WTF: 

Reviewed by Oliver Hunt.
        
Merged r115754 from dfgopt.
        
Added a bitvector class suitable for cheap static analysis. This class
differs from BitVector in that instead of optimizing for space, it
optimizes for execution time. Its API is also somewhat less friendly,
which is intentional; it's meant to be used in places where you know
up front how bit your bitvectors are going to be.

* GNUmakefile.list.am:
* WTF.vcproj/WTF.vcproj:
* WTF.xcodeproj/project.pbxproj:
* wtf/FastBitVector.h: Added.
(WTF):
(FastBitVector):
(WTF::FastBitVector::FastBitVector):
(WTF::FastBitVector::operator=):
(WTF::FastBitVector::numBits):
(WTF::FastBitVector::resize):
(WTF::FastBitVector::setAll):
(WTF::FastBitVector::clearAll):
(WTF::FastBitVector::set):
(WTF::FastBitVector::setAndCheck):
(WTF::FastBitVector::equals):
(WTF::FastBitVector::merge):
(WTF::FastBitVector::filter):
(WTF::FastBitVector::exclude):
(WTF::FastBitVector::clear):
(WTF::FastBitVector::get):
(WTF::FastBitVector::arrayLength):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117861 268f45cc-cd09-0410-ab3c-d52691b4dbfc