2015-07-31  Lucas Forschler  <lforschler@apple.com>

        Merge r187579

    2015-07-29  Filip Pizlo  <fpizlo@apple.com>

            DFG::ArgumentsEliminationPhase should emit a PutStack for all of the GetStacks that the ByteCodeParser emitted
            https://bugs.webkit.org/show_bug.cgi?id=147433
            rdar://problem/21668986

            Reviewed by Mark Lam.

            Ideally, the ByteCodeParser would only emit SetArgument nodes for named arguments.  But
            currently that's not what it does - it emits a SetArgument for every argument that a varargs
            call may pass.  Each SetArgument gets turned into a GetStack.  This means that if
            ArgumentsEliminationPhase optimizes away PutStacks for those varargs arguments that didn't
            get passed or used, we get degenerate IR where we have a GetStack of something that didn't
            have a PutStack.

            This fixes the bug by removing the code to optimize away PutStacks in
            ArgumentsEliminationPhase.

            * dfg/DFGArgumentsEliminationPhase.cpp:
            * tests/stress/varargs-inlining-underflow.js: Added.
            (baz):
            (bar):
            (foo):

2015-07-24  Matthew Hanson  <matthew_hanson@apple.com>

        Merge r187139. rdar://problem/21847618

    2015-07-21  Filip Pizlo  <fpizlo@apple.com>

            Unreviewed, fix a lot of tests. Need to initialize WTF threading sooner.

            * jsc.cpp:
            (main):

2015-07-23  Lucas Forschler  <lforschler@apple.com>

        Merge r187125

    2015-07-21  Filip Pizlo  <fpizlo@apple.com>

            Fixed VM pool allocation should have a reserve for allocations that cannot fail
            https://bugs.webkit.org/show_bug.cgi?id=147154
            rdar://problem/21847618

            Reviewed by Geoffrey Garen.

            This adds the notion of a JIT pool reserve fraction. Some fraction, currently 1/4, of
            the JIT pool is reserved for allocations that cannot fail. It makes sense to make this
            a fraction rather than a constant because each allocation that can fail may cause some
            number of allocations that cannot fail (for example, the OSR exit thunks that we
            compile when we exit from some CodeBlock cannot fail).

            I've tested this by adding a test mode where we artificially limit the JIT pool size.
            Prior to the fix, we had >20 failures. Now we have none.

            * heap/GCLogging.cpp:
            (WTF::printInternal): I needed a dump method on Options members when debugging this.
            * heap/GCLogging.h:
            * jit/ExecutableAllocator.h: Raise the ARM64 limit to 32MB because 16MB is cutting it too close.
            * jit/ExecutableAllocatorFixedVMPool.cpp:
            (JSC::FixedVMPoolExecutableAllocator::FixedVMPoolExecutableAllocator): Add the ability to artificially limit JIT pool size for testing.
            (JSC::ExecutableAllocator::memoryPressureMultiplier): Implement the reserve when computing memory pressure for JIT tier-up heuristics.
            (JSC::ExecutableAllocator::allocate): Implement the reserve when allocating can-fail things.
            * jsc.cpp: Rewire some options parsing so that CommandLine happens before we create the JIT pool.
            (main):
            (CommandLine::parseArguments):
            (jscmain):
            * runtime/Options.cpp: 
            (JSC::OptionRange::dump): I needed a dump method on Options members when debugging this.
            (JSC::Options::initialize): This can now be called more than once.
            * runtime/Options.h:

== Rolled over to ChangeLog-2015-07-23 ==