Wireshark  2.9.0-477-g68ec514b
The Wireshark network protocol analyzer
stack_alloc.h
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1 /* Copyright (C) 2002 Jean-Marc Valin */
6 /*
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33 */
34 
35 #ifndef STACK_ALLOC_H
36 #define STACK_ALLOC_H
37 
38 #ifdef USE_ALLOCA
39 # ifdef WIN32
40 # include <malloc.h>
41 # else
42 # ifdef HAVE_ALLOCA_H
43 # include <alloca.h>
44 # else
45 # include <stdlib.h>
46 # endif
47 # endif
48 #endif
49 
87 #ifdef ENABLE_VALGRIND
88 
89 #include <valgrind/memcheck.h>
90 
91 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
92 
93 #define PUSH(stack, size, type) (VALGRIND_MAKE_NOACCESS(stack, 1000),ALIGN((stack),sizeof(type)),VALGRIND_MAKE_WRITABLE(stack, ((size)*sizeof(type))),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type))))
94 
95 #else
96 
97 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
98 
99 #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type))))
100 
101 #endif
102 
103 #if defined(VAR_ARRAYS)
104 #define VARDECL(var)
105 #define ALLOC(var, size, type) type var[size]
106 #elif defined(USE_ALLOCA)
107 #define VARDECL(var) var
108 #define ALLOC(var, size, type) var = alloca(sizeof(type)*(size))
109 #else
110 #define VARDECL(var) var
111 #define ALLOC(var, size, type) var = PUSH(stack, size, type)
112 #endif
113 
114 
115 #endif