cosmopolitan/libc/mem/gc.h

#ifdef _COSMO_SOURCE
#ifndef COSMOPOLITAN_LIBC_MEM_GC_H_
#define COSMOPOLITAN_LIBC_MEM_GC_H_
COSMOPOLITAN_C_START_

libcesque void _gc_free(void *);
libcesque void __defer(void *, void *, void *);
libcesque void gclongjmp(void *, int) 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;                                           \
  })

COSMOPOLITAN_C_END_
#endif /* COSMOPOLITAN_LIBC_MEM_GC_H_ */
#endif /* _COSMO_SOURCE */
Make cosmo.h work a little better 2024-02-22 00:40:09 +00:00			`#ifdef _COSMO_SOURCE`
Pay off more technical debt This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available. 2022-09-13 06:10:38 +00:00			`#ifndef COSMOPOLITAN_LIBC_MEM_GC_H_`
			`#define COSMOPOLITAN_LIBC_MEM_GC_H_`
Expose public garbage collector API for C language You can now do epic things like this: puts(_gc(xasprintf("%d", 123))); The _gc() API is shorthand for _defer() which works like Go's keyword: const char *s = xasprintf("%d", 123); _defer(free, s); puts(s); Be sure to always use -fno-omit-frame-pointer which makes code fast too. Enjoy! See also #114 2021-03-08 18:56:09 +00:00			`COSMOPOLITAN_C_START_`

Add `dontthrow` attribute to most libc functions This will help C++ code that uses exceptions to be tinier. For example, this change shaves away 1000 lines of assembly code from LLVM's libcxx, which is 0.7% of all assembly instructions in the entire library. 2024-01-09 09:26:03 +00:00			`libcesque void _gc_free(void *);`
			`libcesque void __defer(void , void , void *);`
			`libcesque void gclongjmp(void *, int) wontreturn;`
Bring back gc() function 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. 2024-01-08 18:07:35 +00:00			`#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; \`
Expose public garbage collector API for C language You can now do epic things like this: puts(_gc(xasprintf("%d", 123))); The _gc() API is shorthand for _defer() which works like Go's keyword: const char *s = xasprintf("%d", 123); _defer(free, s); puts(s); Be sure to always use -fno-omit-frame-pointer which makes code fast too. Enjoy! See also #114 2021-03-08 18:56:09 +00:00			`})`

			`COSMOPOLITAN_C_END_`
Pay off more technical debt This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available. 2022-09-13 06:10:38 +00:00			`#endif /* COSMOPOLITAN_LIBC_MEM_GC_H_ */`
Make cosmo.h work a little better 2024-02-22 00:40:09 +00:00			`#endif /* _COSMO_SOURCE */`