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https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
33e8fc8687
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
30 lines
1.3 KiB
C
30 lines
1.3 KiB
C
#ifndef COSMOPOLITAN_LIBC_RUNTIME_GC_H_
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#define COSMOPOLITAN_LIBC_RUNTIME_GC_H_
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#include "libc/calls/calls.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/runtime/runtime.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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void *_gc(void *) hidden;
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void *_defer(void *, void *) hidden;
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void __defer(struct StackFrame *, void *, void *) hidden;
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void __deferer(struct StackFrame *, void *, void *) hidden;
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void _gclongjmp(jmp_buf, int) nothrow wontreturn;
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
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#define _gc(THING) _defer((void *)_weakfree, (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((struct StackFrame *)__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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#endif /* defined(__GNUC__) && !defined(__STRICT_ANSI__) */
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_RUNTIME_GC_H_ */
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