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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.
23 lines
885 B
C
23 lines
885 B
C
#ifndef COSMOPOLITAN_LIBC_MEM_GC_H_
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#define COSMOPOLITAN_LIBC_MEM_GC_H_
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#ifdef _COSMO_SOURCE
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COSMOPOLITAN_C_START_
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libcesque void _gc_free(void *);
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libcesque void __defer(void *, void *, void *);
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libcesque void gclongjmp(void *, int) wontreturn;
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#define gc(THING) defer((void *)_gc_free, (void *)(THING))
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#define _gc(THING) defer((void *)_gc_free, (void *)(THING))
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#define defer(FN, ARG) \
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({ \
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autotype(ARG) Arg = (ARG); \
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/* prevent weird opts like tail call */ \
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__asm__ volatile("" : "+g"(Arg) : : "memory"); \
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__defer(__builtin_frame_address(0), FN, Arg); \
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__asm__ volatile("" : "+g"(Arg) : : "memory"); \
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Arg; \
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})
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COSMOPOLITAN_C_END_
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#endif /* _COSMO_SOURCE */
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#endif /* COSMOPOLITAN_LIBC_MEM_GC_H_ */
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