Mercurial > sdl-ios-xcode
annotate include/SDL_assert.h @ 3647:c5925cd41955
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author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 13 Jan 2010 06:47:17 +0000 |
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children | 1e74d7984d0b |
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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 /* This is an assert macro for SDL's internal use. Not for the public API! */ |
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25 |
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26 #ifndef _SDL_assert_h |
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27 #define _SDL_assert_h |
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28 |
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29 #ifndef SDL_ASSERT_LEVEL |
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30 #error SDL_ASSERT_LEVEL is not defined. Please fix your SDL_config.h. |
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31 #endif |
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32 |
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33 /* |
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34 sizeof (x) makes the compiler still parse the expression even without |
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35 assertions enabled, so the code is always checked at compile time, but |
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36 doesn't actually generate code for it, so there are no side effects or |
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37 expensive checks at run time, just the constant size of what x WOULD be, |
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38 which presumably gets optimized out as unused. |
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39 This also solves the problem of... |
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40 |
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41 int somevalue = blah(); |
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42 SDL_assert(somevalue == 1); |
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43 |
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44 ...which would cause compiles to complain that somevalue is unused if we |
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45 disable assertions. |
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46 */ |
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47 |
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48 #define SDL_disabled_assert(condition) \ |
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49 do { (void) sizeof ((condition)); } while (0) |
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50 |
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51 #if (SDL_ASSERT_LEVEL > 0) |
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52 |
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53 /* |
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54 These are macros and not first class functions so that the debugger breaks |
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55 on the assertion line and not in some random guts of SDL, and so each |
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56 macro can have unique static variables associated with it. |
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57 */ |
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58 |
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59 #if (defined(_MSC_VER) && ((_M_IX86) || (_M_X64))) |
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60 #define SDL_TriggerBreakpoint() __asm { int 3 } |
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61 #elif (defined(__GNUC__) && ((__i386__) || (__x86_64__))) |
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62 #define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" ) |
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63 #elif defined(unix) |
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64 #include <signal.h> |
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65 #define SDL_TriggerBreakpoint() raise(SIGTRAP) |
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66 #else |
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67 #error Please define your platform or set SDL_ASSERT_LEVEL to 0. |
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68 #endif |
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69 |
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70 #if (__STDC_VERSION__ >= 199901L) /* C99 supports __func__ as a standard. */ |
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71 # define SDL_FUNCTION __func__ |
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72 #elif ((__GNUC__ >= 2) || defined(_MSC_VER)) |
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73 # define SDL_FUNCTION __FUNCTION__ |
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74 #else |
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75 # define SDL_FUNCTION "???" |
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76 #endif |
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77 |
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78 typedef enum |
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79 { |
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80 SDL_ASSERTION_RETRY, /**< Retry the assert immediately. */ |
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81 SDL_ASSERTION_BREAK, /**< Make the debugger trigger a breakpoint. */ |
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82 SDL_ASSERTION_ABORT, /**< Terminate the program. */ |
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83 SDL_ASSERTION_IGNORE, /**< Ignore the assert. */ |
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84 SDL_ASSERTION_ALWAYS_IGNORE, /**< Ignore the assert from now on. */ |
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85 } SDL_assert_state; |
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86 |
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87 typedef struct SDL_assert_data |
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88 { |
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89 int always_ignore; |
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90 unsigned int trigger_count; |
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91 const char *condition; |
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92 const char *filename; |
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93 int linenum; |
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94 const char *function; |
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95 struct SDL_assert_data *next; |
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96 } SDL_assert_data; |
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97 |
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98 SDL_assert_state SDL_ReportAssertion(SDL_assert_data *, const char *, int); |
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99 |
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100 /* the do {} while(0) avoids dangling else problems: |
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101 if (x) SDL_assert(y); else blah(); |
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102 ... without the do/while, the "else" could attach to this macro's "if". |
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103 We try to handle just the minimum we need here in a macro...the loop, |
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104 the static vars, and break points. The heavy lifting is handled in |
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105 SDL_ReportAssertion(), in SDL_assert.c. |
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106 */ |
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107 #define SDL_enabled_assert(condition) \ |
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108 do { \ |
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109 while ( !(condition) ) { \ |
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110 static struct SDL_assert_data assert_data = { \ |
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111 0, 0, #condition, __FILE__, 0, 0, 0 \ |
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112 }; \ |
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113 const SDL_assert_state state = SDL_ReportAssertion(&assert_data, \ |
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114 SDL_FUNCTION, \ |
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115 __LINE__); \ |
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116 if (state == SDL_ASSERTION_RETRY) { \ |
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117 continue; /* go again. */ \ |
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118 } else if (state == SDL_ASSERTION_BREAK) { \ |
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119 SDL_TriggerBreakpoint(); \ |
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120 } \ |
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121 break; /* not retrying. */ \ |
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122 } \ |
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123 } while (0) |
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124 |
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125 #endif /* enabled assertions support code */ |
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126 |
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127 /* Enable various levels of assertions. */ |
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128 #if SDL_ASSERT_LEVEL == 0 /* assertions disabled */ |
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129 # define SDL_assert(condition) SDL_disabled_assert(condition) |
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130 # define SDL_assert_release(condition) SDL_disabled_assert(condition) |
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131 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition) |
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132 #elif SDL_ASSERT_LEVEL == 1 /* release settings. */ |
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133 # define SDL_assert(condition) SDL_enabled_assert(condition) |
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134 # define SDL_assert_release(condition) SDL_enabled_assert(condition) |
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135 # define SDL_assert_paranoid(condition) SDL_enabled_assert(condition) |
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136 #elif SDL_ASSERT_LEVEL == 2 /* normal settings. */ |
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137 # define SDL_assert(condition) SDL_enabled_assert(condition) |
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138 # define SDL_assert_release(condition) SDL_enabled_assert(condition) |
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139 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition) |
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140 #elif SDL_ASSERT_LEVEL == 3 /* paranoid settings. */ |
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141 # define SDL_assert(condition) SDL_enabled_assert(condition) |
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142 # define SDL_assert_release(condition) SDL_enabled_assert(condition) |
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143 # define SDL_assert_paranoid(condition) SDL_enabled_assert(condition) |
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144 #else |
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145 # error Unknown assertion level. Please fix your SDL_config.h. |
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146 #endif |
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147 |
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148 #endif /* _SDL_assert_h */ |
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149 |
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150 /* vi: set ts=4 sw=4 expandtab: */ |
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151 |