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Bring back gc() function

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Renaming gc() to _gc() was a mistake since the better thing to do is put
it behind the _COSMO_SOURCE macro. We need this change because I haven't
wanted to use my amazing garbage collector ever since we renamed it. You
now need to define _COSMO_SOURCE yourself when using amalgamation header
and cosmocc users need to pass the -mcosmo flag to get the gc() function

Some other issues relating to cancelation have been fixed along the way.
We're also now putting cosmocc in a folder named `.cosmocc` so it can be
more safely excluded by grep --exclude-dir=.cosmocc --exclude-dir=o etc.
This commit is contained in:
Justine Tunney 2024-01-08 10:07:35 -08:00
parent 6cb0354e19
commit a4b455185b
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280 changed files with 1362 additions and 1407 deletions
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32
libc/mem/gc.h
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@ -1,25 +1,23 @@
#ifndef COSMOPOLITAN_LIBC_MEM_GC_H_
#define COSMOPOLITAN_LIBC_MEM_GC_H_
#ifdef _COSMO_SOURCE
COSMOPOLITAN_C_START_
void *_gc(void *);
void *_defer(void *, void *);
void __defer(void *, void *, void *);
void _gclongjmp(void *, int) dontthrow wontreturn;
void _gc_free(void *);
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
#define _gc(THING) _defer((void *)_gc_free, (void *)(THING))
#define _defer(FN, ARG) \
({ \
autotype(ARG) Arg = (ARG); \
/* prevent weird opts like tail call */ \
asm volatile("" : "+g"(Arg) : : "memory"); \
__defer(__builtin_frame_address(0), FN, Arg); \
asm volatile("" : "+g"(Arg) : : "memory"); \
Arg; \
void _gc_free(void *) libcesque;
void __defer(void *, void *, void *) libcesque;
void gclongjmp(void *, int) libcesque wontreturn;
#define gc(THING) defer((void *)_gc_free, (void *)(THING))
#define _gc(THING) defer((void *)_gc_free, (void *)(THING))
#define defer(FN, ARG) \
({ \
autotype(ARG) Arg = (ARG); \
/* prevent weird opts like tail call */ \
__asm__ volatile("" : "+g"(Arg) : : "memory"); \
__defer(__builtin_frame_address(0), FN, Arg); \
__asm__ volatile("" : "+g"(Arg) : : "memory"); \
Arg; \
})
#endif /* defined(__GNUC__) && !defined(__STRICT_ANSI__) */
COSMOPOLITAN_C_END_
#endif /* _COSMO_SOURCE */
#endif /* COSMOPOLITAN_LIBC_MEM_GC_H_ */