Files
mercury/runtime
Peter Wang 7647cba072 Don't use __builtin_setjmp, __builtin_longjmp on AArch64 with older GCCs.
There is an issue on Linux/aarch64 with older versions of gcc where a
commit performed on a thread using the gcc __builtin_longjmp function
causes an assertion failure in pthread_create() if the Mercury runtime
is dynamically linked:

    pthread_create.c:430: start_thread: Assertion `freesize < pd->stackblock_size' failed.

or a crash if the Mercury runtime is statically linked:

    *** Mercury runtime: caught segmentation violation ***
    cause: address not mapped to object

The gcc versions tested are:

    BAD - gcc version 6.3.0 20170516 (Debian 6.3.0-18) from Debian 9
    BAD - gcc version 8.3.0 (Debian 8.3.0-2) from Debian 10
    OK  - gcc version 10.2.1 20210110 (Debian 10.2.1-6) from Debian 11

on Debian with glibc.

runtime/mercury.h:
    Define MR_USE_GCC_BUILTIN_SETJMP_LONGJMP if we decide to use gcc's
    __builtin_setjmp and __builtin_longjmp functions instead of the
    standard functions.

    Use standard setjmp/longjmp on aarch64 if gcc version is < 10.

    Update the comment for MR_builtin_jmp_buf to refer to the GCC manual
    instead of the GCC source code. Use an array of 'intptr_t's instead
    of 'void *'s, to match the manual.

tests/hard_coded/Mmakefile
tests/hard_coded/thread_commit.m:
tests/hard_coded/thread_commit.exp:
tests/hard_coded/thread_commit.exp2:
    Add test case.
2022-05-26 22:47:58 +10:00
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