cache data structures
https://bugs.webkit.org/show_bug.cgi?id=76768

Reviewed by Sam Weinig.
        
Introduced new classes (like GetByIdStatus) that encapsulate the set of things
that the DFG would like to know about property accesses and calls. Whereas it
previously got this information by directly decoding the data structures used
by the old JIT for inline caching, it now uses these classes, which do the work
for it. This should make it somewhat more straight forward to introduce new
ways of profiling the same information.
        
Also hoisted StructureSet into bytecode/ from dfg/, because it's now used by
code in bytecode/.
        
Making this work right involved carefully ensuring that the heuristics for
choosing how to handle property accesses was at least as good as what we had
before, since I completely restructured that code. Currently the performance
looks neutral. Since I rewrote the code I did change some things that I never
liked before, like previously if a put_bu_id had executed exactly once then
we'd compile it as if it had taken slow-path. Executing once is special because
then the inline cache is not baked in, so there is no information about how the
DFG should optimize the code. Now this is rationalized: if the put_by_id does
not offer enough information to be optimized (i.e. had executed 0 or 1 times)
then we turn it into a forced OSR exit (i.e. a patch point). However, get_by_id
still has the old behavior; I left it that way because I didn't want to make
too many changes at once.

* CMakeLists.txt:
* GNUmakefile.list.am:
* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj:
* JavaScriptCore.xcodeproj/project.pbxproj:
* Target.pri:
* bytecode/CallLinkStatus.cpp: Added.
(JSC::CallLinkStatus::computeFor):
* bytecode/CallLinkStatus.h: Added.
(JSC::CallLinkStatus::CallLinkStatus):
(JSC::CallLinkStatus::isSet):
(JSC::CallLinkStatus::operator!):
(JSC::CallLinkStatus::couldTakeSlowPath):
(JSC::CallLinkStatus::callTarget):
* bytecode/GetByIdStatus.cpp: Added.
(JSC::GetByIdStatus::computeFor):
* bytecode/GetByIdStatus.h: Added.
(JSC::GetByIdStatus::GetByIdStatus):
(JSC::GetByIdStatus::state):
(JSC::GetByIdStatus::isSet):
(JSC::GetByIdStatus::operator!):
(JSC::GetByIdStatus::isSimpleDirect):
(JSC::GetByIdStatus::takesSlowPath):
(JSC::GetByIdStatus::makesCalls):
(JSC::GetByIdStatus::structureSet):
(JSC::GetByIdStatus::offset):
* bytecode/MethodCallLinkStatus.cpp: Added.
(JSC::MethodCallLinkStatus::computeFor):
* bytecode/MethodCallLinkStatus.h: Added.
(JSC::MethodCallLinkStatus::MethodCallLinkStatus):
(JSC::MethodCallLinkStatus::isSet):
(JSC::MethodCallLinkStatus::operator!):
(JSC::MethodCallLinkStatus::needsPrototypeCheck):
(JSC::MethodCallLinkStatus::structure):
(JSC::MethodCallLinkStatus::prototypeStructure):
(JSC::MethodCallLinkStatus::function):
(JSC::MethodCallLinkStatus::prototype):
* bytecode/PutByIdStatus.cpp: Added.
(JSC::PutByIdStatus::computeFor):
* bytecode/PutByIdStatus.h: Added.
(JSC::PutByIdStatus::PutByIdStatus):
(JSC::PutByIdStatus::state):
(JSC::PutByIdStatus::isSet):
(JSC::PutByIdStatus::operator!):
(JSC::PutByIdStatus::isSimpleReplace):
(JSC::PutByIdStatus::isSimpleTransition):
(JSC::PutByIdStatus::takesSlowPath):
(JSC::PutByIdStatus::oldStructure):
(JSC::PutByIdStatus::newStructure):
(JSC::PutByIdStatus::structureChain):
(JSC::PutByIdStatus::offset):
* bytecode/StructureSet.h: Added.
(JSC::StructureSet::StructureSet):
(JSC::StructureSet::clear):
(JSC::StructureSet::add):
(JSC::StructureSet::addAll):
(JSC::StructureSet::remove):
(JSC::StructureSet::contains):
(JSC::StructureSet::isSubsetOf):
(JSC::StructureSet::isSupersetOf):
(JSC::StructureSet::size):
(JSC::StructureSet::at):
(JSC::StructureSet::operator[]):
(JSC::StructureSet::last):
(JSC::StructureSet::predictionFromStructures):
(JSC::StructureSet::operator==):
(JSC::StructureSet::dump):
* dfg/DFGAbstractValue.h:
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::handleCall):
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGStructureSet.h: Removed.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105581 268f45cc-cd09-0410-ab3c-d52691b4dbfc