ivmai / bdwgc / 1513

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Support client-defined stack pointer adjustment before thread stack push

New public GC_set_sp_corrector() and GC_get_sp_corrector() are defined.

This functionality might be useful for a crude integration with certain
coroutine implementations.

* darwin_stop_world.c [STACKPTR_CORRECTOR_AVAILABLE
&& DARWIN_DONT_PARSE_STACK] (GC_stack_range_for): Call GC_sp_corrector
if non-zero.
* pthread_stop_world.c [STACKPTR_CORRECTOR_AVAILABLE]
(GC_push_all_stacks): Likewise.
* win32_threads.c [STACKPTR_CORRECTOR_AVAILABLE] (GC_push_stack_for):
Likewise.
* include/gc/gc.h [GC_THREADS] (GC_sp_corrector_proc): New type; add
comment.
* include/gc/gc.h [GC_THREADS] (GC_set_sp_corrector,
GC_get_sp_corrector): New public function declaration.
* include/private/gc_priv.h [THREADS && STACKPTR_CORRECTOR_AVAILABLE]
(GC_sp_corrector): Declare variable.
* include/private/gcconfig.h [GC_PTHREADS && !E2K && !IA64 && (!DARWIN
|| DARWIN_DONT_PARSE_STACK) && !SN_TARGET_PSP2 && !REDIRECT_MALLOC]
(STACKPTR_CORRECTOR_AVAILABLE): Define macro; add comment.
* misc.c [THREADS && STACKPTR_CORRECTOR_AVAILABLE] (GC_sp_corrector):
Define GC_INNER variable.
* misc.c [THREADS] (GC_set_sp_corrector, GC_get_sp_corrector):
Implement (depending on STACKPTR_CORRECTOR_AVAILABLE).
* tests/gctest.c [GC_PTHREADS] (main): Call GC_get_sp_corrector() and
GC_set_sp_corrector().

13 of 13 new or added lines in 3 files covered. (100.0%)

7831 of 10220 relevant lines covered (76.62%)

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