https://bugs.webkit.org/show_bug.cgi?id=76855

Reviewed by Oliver Hunt.

To enable the profiler, set the JSC_CODE_PROFILING environment variable to
1 (no tracing the C stack), 2 (trace one level of C code) or 3 (recursively
trace all samples).

The profiler requires -fomit-frame-pointer to be removed from the build flags.

* JavaScriptCore.exp:
    - Removed an export.
* JavaScriptCore.xcodeproj/project.pbxproj:
    - Added new files
* bytecode/CodeBlock.cpp:
    - For baseline codeblocks, cache the result of canCompileWithDFG.
* bytecode/CodeBlock.h:
    - For baseline codeblocks, cache the result of canCompileWithDFG.
* jit/ExecutableAllocator.cpp:
(JSC::ExecutableAllocator::initializeAllocator):
    - Notify the profiler when the allocator is created.
(JSC::ExecutableAllocator::allocate):
    - Inform the allocated of the ownerUID.
* jit/ExecutableAllocatorFixedVMPool.cpp:
(JSC::ExecutableAllocator::initializeAllocator):
    - Notify the profiler when the allocator is created.
(JSC::ExecutableAllocator::allocate):
    - Inform the allocated of the ownerUID.
* jit/JITStubs.cpp:
    - If profiling, don't mask the return address in JIT code.
      (We do so to provide nicer backtraces in debug builds).
* runtime/Completion.cpp:
(JSC::evaluate):
    - Notify the profiler of script evaluations.
* tools: Added.
* tools/CodeProfile.cpp: Added.
(JSC::symbolName):
    - Helper function to get the name of a symbol in the framework.
(JSC::truncateTrace):
    - Helper to truncate traces into methods know to have uninformatively deep stacks.
(JSC::CodeProfile::sample):
    - Record a stack trace classifying samples.
(JSC::CodeProfile::report):
    - {Print profiler output.
* tools/CodeProfile.h: Added.
    - new class, captures a set of samples associated with an evaluated script,
      and nested to record samples from subscripts.
* tools/CodeProfiling.cpp: Added.
(JSC::CodeProfiling::profilingTimer):
    - callback fired then a timer event occurs.
(JSC::CodeProfiling::notifyAllocator):
    - called when the executable allocator is constructed.
(JSC::CodeProfiling::getOwnerUIDForPC):
    - helper to lookup the codeblock from an address in JIT code
(JSC::CodeProfiling::begin):
    - enter a profiling scope.
(JSC::CodeProfiling::end):
    - exit a profiling scope.
* tools/CodeProfiling.h: Added.
    - new class, instantialed from Completion to define a profiling scope.
* tools/ProfileTreeNode.h: Added.
    - new class, used to construct a tree of samples.
* tools/TieredMMapArray.h: Added.
    - new class, a malloc-free vector (can be used while the main thread is suspended,
      possibly holding the malloc heap lock).
* wtf/MetaAllocator.cpp:
(WTF::MetaAllocatorHandle::MetaAllocatorHandle):
(WTF::MetaAllocator::allocate):
    - Allow allocation handles to track information about their owner.
* wtf/MetaAllocator.h:
(MetaAllocator):
    - Allow allocation handles to track information about their owner.
* wtf/MetaAllocatorHandle.h:
(MetaAllocatorHandle):
(WTF::MetaAllocatorHandle::ownerUID):
    - Allow allocation handles to track information about their owner.
* wtf/OSAllocator.h:
(WTF::OSAllocator::reallocateCommitted):
    - reallocate an existing, committed memory allocation.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106197 268f45cc-cd09-0410-ab3c-d52691b4dbfc