media/libopus/celt/stack_alloc.h@ac0c01689b40
media/libopus/celt/stack_alloc.h
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /* Copyright (C) 2002-2003 Jean-Marc Valin
2 Copyright (C) 2007-2009 Xiph.Org Foundation */
3 /**
4 @file stack_alloc.h
5 @brief Temporary memory allocation on stack
6 */
7 /*
8 Redistribution and use in source and binary forms, with or without
9 modification, are permitted provided that the following conditions
10 are met:
12 - Redistributions of source code must retain the above copyright
13 notice, this list of conditions and the following disclaimer.
15 - Redistributions in binary form must reproduce the above copyright
16 notice, this list of conditions and the following disclaimer in the
17 documentation and/or other materials provided with the distribution.
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
23 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
32 #ifndef STACK_ALLOC_H
33 #define STACK_ALLOC_H
35 #include "opus_types.h"
36 #include "opus_defines.h"
38 #if (!defined (VAR_ARRAYS) && !defined (USE_ALLOCA) && !defined (NONTHREADSAFE_PSEUDOSTACK))
39 #error "Opus requires one of VAR_ARRAYS, USE_ALLOCA, or NONTHREADSAFE_PSEUDOSTACK be defined to select the temporary allocation mode."
40 #endif
42 #ifdef USE_ALLOCA
43 # ifdef WIN32
44 # include <malloc.h>
45 # else
46 # ifdef HAVE_ALLOCA_H
47 # include <alloca.h>
48 # else
49 # include <stdlib.h>
50 # endif
51 # endif
52 #endif
54 /**
55 * @def ALIGN(stack, size)
56 *
57 * Aligns the stack to a 'size' boundary
58 *
59 * @param stack Stack
60 * @param size New size boundary
61 */
63 /**
64 * @def PUSH(stack, size, type)
65 *
66 * Allocates 'size' elements of type 'type' on the stack
67 *
68 * @param stack Stack
69 * @param size Number of elements
70 * @param type Type of element
71 */
73 /**
74 * @def VARDECL(var)
75 *
76 * Declare variable on stack
77 *
78 * @param var Variable to declare
79 */
81 /**
82 * @def ALLOC(var, size, type)
83 *
84 * Allocate 'size' elements of 'type' on stack
85 *
86 * @param var Name of variable to allocate
87 * @param size Number of elements
88 * @param type Type of element
89 */
91 #if defined(VAR_ARRAYS)
93 #define VARDECL(type, var)
94 #define ALLOC(var, size, type) type var[size]
95 #define SAVE_STACK
96 #define RESTORE_STACK
97 #define ALLOC_STACK
98 /* C99 does not allow VLAs of size zero */
99 #define ALLOC_NONE 1
101 #elif defined(USE_ALLOCA)
103 #define VARDECL(type, var) type *var
105 # ifdef WIN32
106 # define ALLOC(var, size, type) var = ((type*)_alloca(sizeof(type)*(size)))
107 # else
108 # define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size)))
109 # endif
111 #define SAVE_STACK
112 #define RESTORE_STACK
113 #define ALLOC_STACK
114 #define ALLOC_NONE 0
116 #else
118 #ifdef CELT_C
119 char *global_stack=0;
120 #else
121 extern char *global_stack;
122 #endif /* CELT_C */
124 #ifdef ENABLE_VALGRIND
126 #include <valgrind/memcheck.h>
128 #ifdef CELT_C
129 char *global_stack_top=0;
130 #else
131 extern char *global_stack_top;
132 #endif /* CELT_C */
134 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
135 #define PUSH(stack, size, type) (VALGRIND_MAKE_MEM_NOACCESS(stack, global_stack_top-stack),ALIGN((stack),sizeof(type)/sizeof(char)),VALGRIND_MAKE_MEM_UNDEFINED(stack, ((size)*sizeof(type)/sizeof(char))),(stack)+=(2*(size)*sizeof(type)/sizeof(char)),(type*)((stack)-(2*(size)*sizeof(type)/sizeof(char))))
136 #define RESTORE_STACK ((global_stack = _saved_stack),VALGRIND_MAKE_MEM_NOACCESS(global_stack, global_stack_top-global_stack))
137 #define ALLOC_STACK char *_saved_stack; ((global_stack = (global_stack==0) ? ((global_stack_top=opus_alloc_scratch(GLOBAL_STACK_SIZE*2)+(GLOBAL_STACK_SIZE*2))-(GLOBAL_STACK_SIZE*2)) : global_stack),VALGRIND_MAKE_MEM_NOACCESS(global_stack, global_stack_top-global_stack)); _saved_stack = global_stack;
139 #else
141 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
142 #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)/sizeof(char)),(stack)+=(size)*(sizeof(type)/sizeof(char)),(type*)((stack)-(size)*(sizeof(type)/sizeof(char))))
143 #define RESTORE_STACK (global_stack = _saved_stack)
144 #define ALLOC_STACK char *_saved_stack; (global_stack = (global_stack==0) ? opus_alloc_scratch(GLOBAL_STACK_SIZE) : global_stack); _saved_stack = global_stack;
146 #endif /* ENABLE_VALGRIND */
148 #include "os_support.h"
149 #define VARDECL(type, var) type *var
150 #define ALLOC(var, size, type) var = PUSH(global_stack, size, type)
151 #define SAVE_STACK char *_saved_stack = global_stack;
152 #define ALLOC_NONE 0
154 #endif /* VAR_ARRAYS */
157 #ifdef ENABLE_VALGRIND
159 #include <valgrind/memcheck.h>
160 #define OPUS_CHECK_ARRAY(ptr, len) VALGRIND_CHECK_MEM_IS_DEFINED(ptr, len*sizeof(*ptr))
161 #define OPUS_CHECK_VALUE(value) VALGRIND_CHECK_VALUE_IS_DEFINED(value)
162 #define OPUS_CHECK_ARRAY_COND(ptr, len) VALGRIND_CHECK_MEM_IS_DEFINED(ptr, len*sizeof(*ptr))
163 #define OPUS_CHECK_VALUE_COND(value) VALGRIND_CHECK_VALUE_IS_DEFINED(value)
164 #define OPUS_PRINT_INT(value) do {fprintf(stderr, #value " = %d at %s:%d\n", value, __FILE__, __LINE__);}while(0)
165 #define OPUS_FPRINTF fprintf
167 #else
169 static OPUS_INLINE int _opus_false(void) {return 0;}
170 #define OPUS_CHECK_ARRAY(ptr, len) _opus_false()
171 #define OPUS_CHECK_VALUE(value) _opus_false()
172 #define OPUS_PRINT_INT(value) do{}while(0)
173 #define OPUS_FPRINTF (void)
175 #endif
178 #endif /* STACK_ALLOC_H */
