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68 lines
2.2 KiB
68 lines
2.2 KiB
/* Memory allocation on the stack. |
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Copyright (C) 1995, 1999, 2001-2007 Free Software Foundation, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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/* When this file is included, it may be preceded only by preprocessor |
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declarations. Thanks to AIX. Therefore we include it right after |
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"config.h", not later. */ |
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/* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H |
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means there is a real alloca function. */ |
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#ifndef _GL_ALLOCA_H |
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#define _GL_ALLOCA_H |
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/* alloca(N) returns a pointer (void* or char*) to N bytes of memory |
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allocated on the stack, and which will last until the function returns. |
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Use of alloca should be avoided: |
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- inside arguments of function calls - undefined behaviour, |
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- in inline functions - the allocation may actually last until the |
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calling function returns, |
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- for huge N (say, N >= 65536) - you never know how large (or small) |
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the stack is, and when the stack cannot fulfill the memory allocation |
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request, the program just crashes. |
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*/ |
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#ifndef alloca |
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# ifdef __GNUC__ |
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# define alloca __builtin_alloca |
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# else |
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# ifdef _MSC_VER |
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# include <malloc.h> |
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# define alloca _alloca |
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# else |
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# if HAVE_ALLOCA_H |
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# include <alloca.h> |
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# else |
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# ifdef _AIX |
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#pragma alloca |
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# else |
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# ifdef __hpux /* This section must match that of bison generated files. */ |
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# ifdef __cplusplus |
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extern "C" void *alloca (unsigned int); |
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# else /* not __cplusplus */ |
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extern void *alloca (); |
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# endif /* not __cplusplus */ |
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# else /* not __hpux */ |
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# ifndef alloca |
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extern char *alloca (); |
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# endif |
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# endif /* __hpux */ |
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# endif |
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# endif |
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# endif |
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# endif |
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#endif |
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#endif /* _GL_ALLOCA_H */
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