mirror of git://sourceware.org/git/glibc.git
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
#ifndef _ALLOCA_H
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#include <stdlib/alloca.h>
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#include <stackinfo.h>
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#undef __alloca
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/* Now define the internal interfaces. */
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extern void *__alloca (size_t __size);
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#ifdef __GNUC__
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# define __alloca(size) __builtin_alloca (size)
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#endif /* GCC. */
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extern int __libc_use_alloca (size_t size) __attribute__ ((const));
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extern int __libc_alloca_cutoff (size_t size) __attribute__ ((const));
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libc_hidden_proto (__libc_alloca_cutoff)
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#define __MAX_ALLOCA_CUTOFF 65536
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#include <allocalim.h>
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#ifndef stackinfo_alloca_round
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# define stackinfo_alloca_round(l) (((l) + 15) & -16)
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#endif
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#if _STACK_GROWS_DOWN
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# define extend_alloca(buf, len, newlen) \
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(__typeof (buf)) ({ size_t __newlen = stackinfo_alloca_round (newlen); \
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char *__newbuf = __alloca (__newlen); \
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if (__newbuf + __newlen == (char *) buf) \
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len += __newlen; \
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else \
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len = __newlen; \
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__newbuf; })
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#elif _STACK_GROWS_UP
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# define extend_alloca(buf, len, newlen) \
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(__typeof (buf)) ({ size_t __newlen = stackinfo_alloca_round (newlen); \
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char *__newbuf = __alloca (__newlen); \
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char *__buf = (buf); \
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if (__buf + len == __newbuf) \
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{ \
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len += __newlen; \
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__newbuf = __buf; \
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} \
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else \
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len = __newlen; \
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__newbuf; })
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#else
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# define extend_alloca(buf, len, newlen) \
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__alloca (((len) = (newlen)))
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#endif
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#if defined stackinfo_get_sp && defined stackinfo_sub_sp
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# define alloca_account(size, avar) \
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({ void *old__ = stackinfo_get_sp (); \
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void *m__ = __alloca (size); \
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avar += stackinfo_sub_sp (old__); \
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m__; })
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# define extend_alloca_account(buf, len, newlen, avar) \
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({ void *old__ = stackinfo_get_sp (); \
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void *m__ = extend_alloca (buf, len, newlen); \
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avar += stackinfo_sub_sp (old__); \
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m__; })
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#else
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# define alloca_account(size, avar) \
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({ size_t s__ = (size); \
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avar += s__; \
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__alloca (s__); })
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# define extend_alloca_account(buf, len, newlen, avar) \
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({ size_t s__ = (newlen); \
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avar += s__; \
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extend_alloca (buf, len, s__); })
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#endif
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#endif
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