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annotate include/SDL_assert.h @ 5172:ededa1ccf91c

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Switched the SDL 1.2 compatibility to use the window surface, so it's fast even when there's no hardware acceleration available. This means that the YUV overlay now uses software, but that's okay since fast YUV code should be using the textures now anyway.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 03 Feb 2011 21:13:55 -0800
parents c2539ff054c8
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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
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23 #ifndef _SDL_assert_h
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24 #define _SDL_assert_h
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25
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26 #include "SDL_config.h"
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27
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28 #include "begin_code.h"
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29 /* Set up for C function definitions, even when using C++ */
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30 #ifdef __cplusplus
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31 /* *INDENT-OFF* */
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32 extern "C" {
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33 /* *INDENT-ON* */
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34 #endif
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35
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36 #ifndef SDL_ASSERT_LEVEL
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37 #ifdef SDL_DEFAULT_ASSERT_LEVEL
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38 #define SDL_ASSERT_LEVEL SDL_DEFAULT_ASSERT_LEVEL
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39 #elif defined(_DEBUG) || defined(DEBUG) || \
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40 (defined(__GNUC__) && !defined(__OPTIMIZE__))
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41 #define SDL_ASSERT_LEVEL 2
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42 #else
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43 #define SDL_ASSERT_LEVEL 1
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44 #endif
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45 #endif /* SDL_ASSERT_LEVEL */
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46
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47 /*
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48 These are macros and not first class functions so that the debugger breaks
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49 on the assertion line and not in some random guts of SDL, and so each
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50 assert can have unique static variables associated with it.
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51 */
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52
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53 #if defined(_MSC_VER) && !defined(_WIN32_WCE)
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54 #include <intrin.h>
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55 #define SDL_TriggerBreakpoint() __debugbreak()
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56 #elif (defined(__GNUC__) && ((__i386__) || (__x86_64__)))
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57 #define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" )
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58 #elif defined(HAVE_SIGNAL_H)
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59 #include <signal.h>
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60 #define SDL_TriggerBreakpoint() raise(SIGTRAP)
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61 #else
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62 /* How do we trigger breakpoints on this platform? */
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63 #define SDL_TriggerBreakpoint()
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64 #endif
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65
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66 #if (__STDC_VERSION__ >= 199901L) /* C99 supports __func__ as a standard. */
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67 # define SDL_FUNCTION __func__
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68 #elif ((__GNUC__ >= 2) || defined(_MSC_VER))
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69 # define SDL_FUNCTION __FUNCTION__
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70 #else
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71 # define SDL_FUNCTION "???"
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72 #endif
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73 #define SDL_FILE __FILE__
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74 #define SDL_LINE __LINE__
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75
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76 /*
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77 sizeof (x) makes the compiler still parse the expression even without
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78 assertions enabled, so the code is always checked at compile time, but
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79 doesn't actually generate code for it, so there are no side effects or
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80 expensive checks at run time, just the constant size of what x WOULD be,
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81 which presumably gets optimized out as unused.
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82 This also solves the problem of...
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83
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84 int somevalue = blah();
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85 SDL_assert(somevalue == 1);
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86
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87 ...which would cause compiles to complain that somevalue is unused if we
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88 disable assertions.
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89 */
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90
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91 #define SDL_disabled_assert(condition) \
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92 do { (void) sizeof ((condition)); } while (0)
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93
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94 #if (SDL_ASSERT_LEVEL > 0)
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95
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96 typedef enum
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97 {
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98 SDL_ASSERTION_RETRY, /**< Retry the assert immediately. */
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99 SDL_ASSERTION_BREAK, /**< Make the debugger trigger a breakpoint. */
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100 SDL_ASSERTION_ABORT, /**< Terminate the program. */
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101 SDL_ASSERTION_IGNORE, /**< Ignore the assert. */
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102 SDL_ASSERTION_ALWAYS_IGNORE, /**< Ignore the assert from now on. */
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103 } SDL_assert_state;
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104
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105 typedef struct SDL_assert_data
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106 {
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107 int always_ignore;
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108 unsigned int trigger_count;
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109 const char *condition;
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110 const char *filename;
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111 int linenum;
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112 const char *function;
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113 const struct SDL_assert_data *next;
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114 } SDL_assert_data;
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115
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116 /* Never call this directly. Use the SDL_assert* macros. */
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117 extern DECLSPEC SDL_assert_state SDLCALL SDL_ReportAssertion(SDL_assert_data *,
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118 const char *,
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119 const char *, int);
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120
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121 /* the do {} while(0) avoids dangling else problems:
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122 if (x) SDL_assert(y); else blah();
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123 ... without the do/while, the "else" could attach to this macro's "if".
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124 We try to handle just the minimum we need here in a macro...the loop,
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125 the static vars, and break points. The heavy lifting is handled in
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126 SDL_ReportAssertion(), in SDL_assert.c.
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127 */
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128 #define SDL_enabled_assert(condition) \
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129 do { \
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130 while ( !(condition) ) { \
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131 static struct SDL_assert_data assert_data = { \
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132 0, 0, #condition, 0, 0, 0, 0 \
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133 }; \
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134 const SDL_assert_state state = SDL_ReportAssertion(&assert_data, \
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135 SDL_FUNCTION, \
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136 SDL_FILE, \
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137 SDL_LINE); \
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138 if (state == SDL_ASSERTION_RETRY) { \
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139 continue; /* go again. */ \
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140 } else if (state == SDL_ASSERTION_BREAK) { \
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141 SDL_TriggerBreakpoint(); \
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142 } \
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143 break; /* not retrying. */ \
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144 } \
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145 } while (0)
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146
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147 #endif /* enabled assertions support code */
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148
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149 /* Enable various levels of assertions. */
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150 #if SDL_ASSERT_LEVEL == 0 /* assertions disabled */
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151 # define SDL_assert(condition) SDL_disabled_assert(condition)
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152 # define SDL_assert_release(condition) SDL_disabled_assert(condition)
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153 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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154 #elif SDL_ASSERT_LEVEL == 1 /* release settings. */
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155 # define SDL_assert(condition) SDL_disabled_assert(condition)
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156 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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157 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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158 #elif SDL_ASSERT_LEVEL == 2 /* normal settings. */
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159 # define SDL_assert(condition) SDL_enabled_assert(condition)
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160 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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161 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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162 #elif SDL_ASSERT_LEVEL == 3 /* paranoid settings. */
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163 # define SDL_assert(condition) SDL_enabled_assert(condition)
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164 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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165 # define SDL_assert_paranoid(condition) SDL_enabled_assert(condition)
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166 #else
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167 # error Unknown assertion level.
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168 #endif
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169
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170
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171 typedef SDL_assert_state (SDLCALL *SDL_AssertionHandler)(
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172 const SDL_assert_data *, void *userdata);
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173
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174 /**
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175 * \brief Set an application-defined assertion handler.
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176 *
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177 * This allows an app to show its own assertion UI and/or force the
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178 * response to an assertion failure. If the app doesn't provide this, SDL
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179 * will try to do the right thing, popping up a system-specific GUI dialog,
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180 * and probably minimizing any fullscreen windows.
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181 *
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182 * This callback may fire from any thread, but it runs wrapped in a mutex, so
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183 * it will only fire from one thread at a time.
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184 *
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185 * Setting the callback to NULL restores SDL's original internal handler.
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186 *
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187 * This callback is NOT reset to SDL's internal handler upon SDL_Quit()!
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188 *
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189 * \return SDL_assert_state value of how to handle the assertion failure.
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190 *
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191 * \param handler Callback function, called when an assertion fails.
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192 * \param userdata A pointer passed to the callback as-is.
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193 */
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194 extern DECLSPEC void SDLCALL SDL_SetAssertionHandler(
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195 SDL_AssertionHandler handler,
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196 void *userdata);
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197
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198 /**
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199 * \brief Get a list of all assertion failures.
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200 *
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201 * Get all assertions triggered since last call to SDL_ResetAssertionReport(),
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202 * or the start of the program.
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203 *
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204 * The proper way to examine this data looks something like this:
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205 *
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206 * <code>
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207 * const SDL_assert_data *item = SDL_GetAssertionReport();
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208 * while (item->condition) {
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209 * printf("'%s', %s (%s:%d), triggered %u times, always ignore: %s.\n",
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210 * item->condition, item->function, item->filename,
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211 * item->linenum, item->trigger_count,
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212 * item->always_ignore ? "yes" : "no");
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213 * item = item->next;
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214 * }
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215 * </code>
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216 *
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217 * \return List of all assertions. This never returns NULL,
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218 * even if there are no items.
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219 * \sa SDL_ResetAssertionReport
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220 */
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221 extern DECLSPEC const SDL_assert_data * SDLCALL SDL_GetAssertionReport(void);
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222
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223 /**
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224 * \brief Reset the list of all assertion failures.
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225 *
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226 * Reset list of all assertions triggered.
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227 *
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228 * \sa SDL_GetAssertionReport
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229 */
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230 extern DECLSPEC void SDLCALL SDL_ResetAssertionReport(void);
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231
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232 /* Ends C function definitions when using C++ */
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233 #ifdef __cplusplus
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234 /* *INDENT-OFF* */
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235 }
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236 /* *INDENT-ON* */
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237 #endif
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238 #include "close_code.h"
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239
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240 #endif /* _SDL_assert_h */
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241
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242 /* vi: set ts=4 sw=4 expandtab: */