Fix handling of indirect stackmap locations in FTL OSR exit
https://bugs.webkit.org/show_bug.cgi?id=122666
Reviewed by Mark Hahnenberg.
With this change, the llvm.webkit.stackmap-based OSR exit only fails one test, down from
five tests previously.
* ftl/FTLLocation.cpp:
(JSC::FTL::Location::gpr): It's OK to call this method when kind() == Indirect, so asserting that isGPR() is wrong; change to assert that involvesGPR().
(JSC::FTL::Location::restoreInto): Stack-related registers aren't saved to the scratch buffer, so use them directly.
* ftl/FTLLocation.h: Add comment about requirements for stack layout.
* ftl/FTLOSRExitCompiler.cpp:
(JSC::FTL::compileStubWithOSRExitStackmap): Make enough room on the stack so that saveAllRegisters() has a scratchpad to save things to. Without this, saveAllRegisters() may clobber a spilled value.
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157326 268f45cc-cd09-0410-ab3c-d52691b4dbfc
4 files changed
