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If a function happens to: - call setjmp - do a 16-byte stack allocation - call a function that sets up a stack frame and longjmp's back The stack pointer that is restores by setjmp will no longer point to a valid back chain. According to the ABI, stack accesses in such a function are to be frame pointer based - so it is an error (quite obviously) to restore the stack from the back chain. We already restore the stack from the frame pointer when there are calls to fast_cc functions. We just need to also do that when there are calls to setjmp. This patch simply does that. This was pointed out by the Julia team. Differential revision: https://reviews.llvm.org/D92906 |
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