mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-18 03:22:40 +00:00
eeb20775d2
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.
24 lines
885 B
C
24 lines
885 B
C
#ifndef COSMOPOLITAN_LIBC_MEM_GC_H_
|
|
#define COSMOPOLITAN_LIBC_MEM_GC_H_
|
|
#ifdef _COSMO_SOURCE
|
|
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 /* _COSMO_SOURCE */
|
|
#endif /* COSMOPOLITAN_LIBC_MEM_GC_H_ */
|