[LLVMdev] setjmp / longjmp does not work on X86 (original) (raw)
Tim Northover t.p.northover at gmail.com
Mon Feb 9 09:27:42 PST 2015
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Hi Paweł,
On Windows 64bit and Linux 64bit this code crashes. setjmp lowering pushes only jump address to buffer, but longjmp expects also stack pointer (rsp) and bsp register values to be in the buffer.
Saving those two components is the front-end's responsibility (http://llvm.org/docs/ExceptionHandling.html#llvm-eh-sjlj-setjmp). The best idea is probably to copy what clang produces for:
void foo(void *buf) { __builtin_setjmp(buf); }
Cheers.
Tim.
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