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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.
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6cb0354e19
commit
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280 changed files with 1362 additions and 1407 deletions
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@ -39,7 +39,7 @@ static void TeardownGc(void) {
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if (__tls_enabled) {
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t = __get_tls();
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if ((g = t->tib_garbages)) {
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// exit() currently doesn't use _gclongjmp() like pthread_exit()
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// exit() currently doesn't use gclongjmp() like pthread_exit()
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// so we need to run the deferred functions manually.
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while (g->i) {
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--g->i;
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@ -88,7 +88,7 @@ static void DeferFunction(struct StackFrame *frame, void *fn, void *arg) {
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frame->addr = (intptr_t)__gc;
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}
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// the gnu extension macros for _gc / _defer point here
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// the gnu extension macros for gc / defer point here
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void __defer(void *rbp, void *fn, void *arg) {
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struct StackFrame *f, *frame = rbp;
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f = __builtin_frame_address(0);
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@ -96,48 +96,3 @@ void __defer(void *rbp, void *fn, void *arg) {
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unassert(PointerNotOwnedByParentStackFrame(f, frame, arg));
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DeferFunction(frame, fn, arg);
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}
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/**
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* Frees memory when function returns.
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*
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* This garbage collector overwrites the return address on the stack so
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* that the RET instruction calls a trampoline which calls free(). It's
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* loosely analogous to Go's defer keyword rather than a true cycle gc.
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*
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* const char *s = _gc(strdup("hello"));
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* puts(s);
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*
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* This macro is equivalent to:
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*
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* _defer(free, ptr)
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*
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* @warning do not return a gc()'d pointer
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* @warning do not realloc() with gc()'d pointer
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* @warning be careful about static keyword due to impact of inlining
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* @note you should use -fno-omit-frame-pointer
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*/
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void *(_gc)(void *thing) {
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struct StackFrame *frame;
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frame = __builtin_frame_address(0);
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DeferFunction(frame->next, _weakfree, thing);
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return thing;
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}
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/**
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* Calls fn(arg) when function returns.
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*
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* This garbage collector overwrites the return address on the stack so
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* that the RET instruction calls a trampoline which calls free(). It's
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* loosely analogous to Go's defer keyword rather than a true cycle gc.
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*
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* @warning do not return a gc()'d pointer
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* @warning do not realloc() with gc()'d pointer
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* @warning be careful about static keyword due to impact of inlining
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* @note you should use -fno-omit-frame-pointer
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*/
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void *(_defer)(void *fn, void *arg) {
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struct StackFrame *frame;
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frame = __builtin_frame_address(0);
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DeferFunction(frame->next, fn, arg);
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return arg;
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}
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@ -1,25 +1,23 @@
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#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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void *_gc(void *);
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void *_defer(void *, void *);
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void __defer(void *, void *, void *);
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void _gclongjmp(void *, int) dontthrow wontreturn;
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void _gc_free(void *);
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
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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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void _gc_free(void *) libcesque;
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void __defer(void *, void *, void *) libcesque;
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void gclongjmp(void *, int) libcesque 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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#endif /* defined(__GNUC__) && !defined(__STRICT_ANSI__) */
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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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@ -1,9 +0,0 @@
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#ifndef COSMOPOLITAN_LIBC_MEM_GC_INTERNAL_H_
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#define COSMOPOLITAN_LIBC_MEM_GC_INTERNAL_H_
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#include "libc/mem/gc.h"
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#define gc(THING) _gc(THING)
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#define defer(FN, ARG) _defer(FN, ARG)
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#define gclongjmp(JB, ARG) _gclongjmp(JB, ARG)
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#endif /* COSMOPOLITAN_LIBC_MEM_GC_INTERNAL_H_ */
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