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138 lines
5.2 KiB
138 lines
5.2 KiB
/* $XConsortium: Xalloca.h /main/6 1996/09/28 16:17:22 rws $ */
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/*
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Copyright (c) 1995 X Consortium
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the X Consortium shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from the X Consortium.
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*/
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/*
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* The purpose of this header is to define the macros ALLOCATE_LOCAL and
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* DEALLOCATE_LOCAL appropriately for the platform being compiled on.
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* These macros are used to make fast, function-local memory allocations.
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* Their characteristics are as follows:
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*
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* void *ALLOCATE_LOCAL(int size)
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* Returns a pointer to size bytes of memory, or NULL if the allocation
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* failed. The memory must be freed with DEALLOCATE_LOCAL before the
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* function that made the allocation returns. You should not ask for
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* large blocks of memory with this function, since on many platforms
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* the memory comes from the stack, which may have limited size.
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*
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* void DEALLOCATE_LOCAL(void *)
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* Frees the memory allocated by ALLOCATE_LOCAL. Omission of this
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* step may be harmless on some platforms, but will result in
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* memory leaks or worse on others.
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*
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* Before including this file, you should define two macros,
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* ALLOCATE_LOCAL_FALLBACK and DEALLOCATE_LOCAL_FALLBACK, that have the
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* same characteristics as ALLOCATE_LOCAL and DEALLOCATE_LOCAL. The
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* header uses the fallbacks if it doesn't know a "better" way to define
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* ALLOCATE_LOCAL and DEALLOCATE_LOCAL. Typical usage would be:
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*
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* #define ALLOCATE_LOCAL_FALLBACK(_size) malloc(_size)
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* #define DEALLOCATE_LOCAL_FALLBACK(_ptr) free(_ptr)
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* #include "Xalloca.h"
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*/
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#ifndef XALLOCA_H
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#define XALLOCA_H 1
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#ifdef INCLUDE_ALLOCA_H
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# include <alloca.h>
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#endif
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#ifndef NO_ALLOCA
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/*
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* os-dependent definition of local allocation and deallocation
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* If you want something other than (DE)ALLOCATE_LOCAL_FALLBACK
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* for ALLOCATE/DEALLOCATE_LOCAL then you add that in here.
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*/
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# if defined(__HIGHC__)
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# ifndef NCR
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extern char *alloca();
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# if HCVERSION < 21003
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# define ALLOCATE_LOCAL(size) alloca((int)(size))
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pragma on(alloca);
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# else /* HCVERSION >= 21003 */
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# define ALLOCATE_LOCAL(size) _Alloca((int)(size))
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# endif /* HCVERSION < 21003 */
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# else /* NCR */
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# define ALLOCATE_LOCAL(size) alloca(size)
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# endif
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# define DEALLOCATE_LOCAL(ptr) /* as nothing */
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# endif /* defined(__HIGHC__) */
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# ifdef __GNUC__
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# ifndef alloca
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# define alloca __builtin_alloca
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# endif /* !alloca */
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# define ALLOCATE_LOCAL(size) alloca((int)(size))
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# define DEALLOCATE_LOCAL(ptr) /* as nothing */
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# else /* ! __GNUC__ */
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/*
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* warning: old mips alloca (pre 2.10) is unusable, new one is built in
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* Test is easy, the new one is named __builtin_alloca and comes
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* from alloca.h which #defines alloca.
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*/
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# ifndef NCR
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# if defined(vax) || defined(sun) || defined(apollo) || defined(stellar) || defined(USL) || defined(alloca)
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/*
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* Some System V boxes extract alloca.o from /lib/libPW.a; if you
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* decide that you don't want to use alloca, you might want to fix it here.
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*/
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/* alloca might be a macro taking one arg (hi, Sun!), so give it one. */
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# ifndef __sgi /* IRIX 5/6 has definition */
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# define __Xnullarg /* as nothing */
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# ifndef X_NOT_STDC_ENV
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extern void *alloca(__Xnullarg);
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# else
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extern char *alloca(__Xnullarg);
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# endif
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# endif /* __sgi */
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# define ALLOCATE_LOCAL(size) alloca((int)(size))
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# define DEALLOCATE_LOCAL(ptr) /* as nothing */
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# endif /* who does alloca */
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# endif /* NCR */
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# endif /* __GNUC__ */
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#endif /* NO_ALLOCA */
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#if !defined(ALLOCATE_LOCAL)
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# if defined(ALLOCATE_LOCAL_FALLBACK) && defined(DEALLOCATE_LOCAL_FALLBACK)
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# define ALLOCATE_LOCAL(_size) ALLOCATE_LOCAL_FALLBACK(_size)
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# define DEALLOCATE_LOCAL(_ptr) DEALLOCATE_LOCAL_FALLBACK(_ptr)
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# else /* no fallbacks supplied; error */
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# define ALLOCATE_LOCAL(_size) ALLOCATE_LOCAL_FALLBACK undefined!
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# define DEALLOCATE_LOCAL(_ptr) DEALLOCATE_LOCAL_FALLBACK undefined!
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# endif /* defined(ALLOCATE_LOCAL_FALLBACK && DEALLOCATE_LOCAL_FALLBACK) */
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#endif /* !defined(ALLOCATE_LOCAL) */
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#endif /* XALLOCA_H */
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