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annotate include/SDL_assert.h @ 3654:336f3df1578d

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Allow configure to override assertion settings, but by default this comes from the build optimization level.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 13 Jan 2010 08:06:32 +0000
parents 1cd9f7117b98
children 1cc7f0143c12
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifndef _SDL_assert_h
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25 #define _SDL_assert_h
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26
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27 #ifndef SDL_ASSERT_LEVEL
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28 #ifdef SDL_DEFAULT_ASSERT_LEVEL
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29 #define SDL_ASSERT_LEVEL SDL_DEFAULT_ASSERT_LEVEL
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30 #elif defined(_DEBUG) || defined(DEBUG) || \
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31 (defined(__GNUC__) && !defined(__OPTIMIZE__))
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32 #define SDL_ASSERT_LEVEL 2
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33 #else
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34 #define SDL_ASSERT_LEVEL 1
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35 #endif
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36 #endif /* SDL_ASSERT_LEVEL */
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37
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38 /*
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39 sizeof (x) makes the compiler still parse the expression even without
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40 assertions enabled, so the code is always checked at compile time, but
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41 doesn't actually generate code for it, so there are no side effects or
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42 expensive checks at run time, just the constant size of what x WOULD be,
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43 which presumably gets optimized out as unused.
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44 This also solves the problem of...
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45
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46 int somevalue = blah();
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47 SDL_assert(somevalue == 1);
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48
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49 ...which would cause compiles to complain that somevalue is unused if we
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50 disable assertions.
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51 */
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52
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53 #define SDL_disabled_assert(condition) \
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54 do { (void) sizeof ((condition)); } while (0)
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55
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56 #if (SDL_ASSERT_LEVEL > 0)
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57
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58 /*
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59 These are macros and not first class functions so that the debugger breaks
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60 on the assertion line and not in some random guts of SDL, and so each
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61 macro can have unique static variables associated with it.
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62 */
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63
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64 #if (defined(_MSC_VER) && ((_M_IX86) || (_M_X64)))
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65 #define SDL_TriggerBreakpoint() __asm { int 3 }
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66 #elif (defined(__GNUC__) && ((__i386__) || (__x86_64__)))
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67 #define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" )
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68 #elif defined(HAVE_SIGNAL_H)
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69 #include <signal.h>
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70 #define SDL_TriggerBreakpoint() raise(SIGTRAP)
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71 #else
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72 #error Please define your platform or set SDL_ASSERT_LEVEL to 0.
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73 #endif
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74
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75 #if (__STDC_VERSION__ >= 199901L) /* C99 supports __func__ as a standard. */
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76 # define SDL_FUNCTION __func__
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77 #elif ((__GNUC__ >= 2) || defined(_MSC_VER))
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78 # define SDL_FUNCTION __FUNCTION__
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79 #else
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80 # define SDL_FUNCTION "???"
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81 #endif
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82
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83 typedef enum
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84 {
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85 SDL_ASSERTION_RETRY, /**< Retry the assert immediately. */
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86 SDL_ASSERTION_BREAK, /**< Make the debugger trigger a breakpoint. */
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87 SDL_ASSERTION_ABORT, /**< Terminate the program. */
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88 SDL_ASSERTION_IGNORE, /**< Ignore the assert. */
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89 SDL_ASSERTION_ALWAYS_IGNORE, /**< Ignore the assert from now on. */
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90 } SDL_assert_state;
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91
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92 typedef struct SDL_assert_data
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93 {
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94 int always_ignore;
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95 unsigned int trigger_count;
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96 const char *condition;
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97 const char *filename;
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98 int linenum;
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99 const char *function;
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100 struct SDL_assert_data *next;
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101 } SDL_assert_data;
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102
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103 SDL_assert_state SDL_ReportAssertion(SDL_assert_data *, const char *, int);
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104
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105 /* the do {} while(0) avoids dangling else problems:
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106 if (x) SDL_assert(y); else blah();
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107 ... without the do/while, the "else" could attach to this macro's "if".
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108 We try to handle just the minimum we need here in a macro...the loop,
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109 the static vars, and break points. The heavy lifting is handled in
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110 SDL_ReportAssertion(), in SDL_assert.c.
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111 */
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112 #define SDL_enabled_assert(condition) \
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113 do { \
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114 while ( !(condition) ) { \
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115 static struct SDL_assert_data assert_data = { \
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116 0, 0, #condition, __FILE__, 0, 0, 0 \
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117 }; \
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118 const SDL_assert_state state = SDL_ReportAssertion(&assert_data, \
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119 SDL_FUNCTION, \
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120 __LINE__); \
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121 if (state == SDL_ASSERTION_RETRY) { \
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122 continue; /* go again. */ \
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123 } else if (state == SDL_ASSERTION_BREAK) { \
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124 SDL_TriggerBreakpoint(); \
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125 } \
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126 break; /* not retrying. */ \
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127 } \
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128 } while (0)
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129
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130 #endif /* enabled assertions support code */
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131
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132 /* Enable various levels of assertions. */
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133 #if SDL_ASSERT_LEVEL == 0 /* assertions disabled */
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134 # define SDL_assert(condition) SDL_disabled_assert(condition)
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135 # define SDL_assert_release(condition) SDL_disabled_assert(condition)
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136 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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137 #elif SDL_ASSERT_LEVEL == 1 /* release settings. */
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138 # define SDL_assert(condition) SDL_disabled_assert(condition)
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139 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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140 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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141 #elif SDL_ASSERT_LEVEL == 2 /* normal settings. */
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142 # define SDL_assert(condition) SDL_enabled_assert(condition)
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143 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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144 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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145 #elif SDL_ASSERT_LEVEL == 3 /* paranoid settings. */
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146 # define SDL_assert(condition) SDL_enabled_assert(condition)
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147 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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148 # define SDL_assert_paranoid(condition) SDL_enabled_assert(condition)
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149 #else
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150 # error Unknown assertion level. Please fix your SDL_config.h.
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151 #endif
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152
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153 #endif /* _SDL_assert_h */
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154
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155 /* vi: set ts=4 sw=4 expandtab: */