Mercurial > ecos
annotate host/infra/assert.cxx @ 3292:7f8e529b4d82 default tip
Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
| author | vae |
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| date | Wed, 29 Apr 2015 23:31:48 +0000 |
| parents | 74dbf4c3f2e1 |
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| rev | line source |
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1 //{{{ Banner |
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2 |
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3 //============================================================================ |
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4 // |
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5 // assert.cxx |
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6 // |
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7 // Host side implementation of the infrastructure assertions. |
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8 // |
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9 //============================================================================ |
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10 // ####ECOSHOSTGPLCOPYRIGHTBEGIN#### |
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11 // ------------------------------------------- |
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12 // This file is part of the eCos host tools. |
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13 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
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14 // |
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15 // This program is free software; you can redistribute it and/or modify |
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16 // it under the terms of the GNU General Public License as published by |
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17 // the Free Software Foundation; either version 2 or (at your option) any |
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18 // later version. |
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19 // |
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20 // This program is distributed in the hope that it will be useful, but |
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21 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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22 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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23 // General Public License for more details. |
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24 // |
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25 // You should have received a copy of the GNU General Public License |
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26 // along with this program; if not, write to the |
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27 // Free Software Foundation, Inc., 51 Franklin Street, |
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28 // Fifth Floor, Boston, MA 02110-1301, USA. |
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29 // ------------------------------------------- |
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30 // ####ECOSHOSTGPLCOPYRIGHTEND#### |
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31 //============================================================================ |
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32 //#####DESCRIPTIONBEGIN#### |
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33 // |
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34 // Author(s): bartv |
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35 // Contact(s): bartv |
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36 // Date: 1998/11/27 |
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37 // Version: 0.01 |
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38 // Purpose: To provide a host-side implementation of the eCos assertion |
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39 // facilities. |
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40 // |
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41 //####DESCRIPTIONEND#### |
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42 //============================================================================ |
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43 |
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44 //}}} |
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45 //{{{ #include's |
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46 |
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47 #include "pkgconf/infra.h" |
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48 #include "cyg/infra/cyg_type.h" |
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49 // Without this symbol the header file has no effect |
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50 #define CYGDBG_USE_TRACING |
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51 // Make sure that the host-side extensions get prototyped |
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52 // as well. |
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53 #define CYG_DECLARE_HOST_ASSERTION_SUPPORT |
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54 #include "cyg/infra/cyg_ass.h" |
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55 |
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56 // STDIO is needed for the default assertion handler. |
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57 // STDLIB is needed for exit() and the status codes. |
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59 #include <cstdio> |
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60 #include <cstdlib> |
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62 |
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63 #if defined(__unix__) || defined(__CYGWIN32__) |
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64 extern "C" { |
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65 #include <unistd.h> // Needed for _exit() |
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66 } |
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67 #endif |
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68 |
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69 // These are needed for the table of callbacks. |
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70 #include <utility> |
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71 #include <iterator> |
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72 #include <vector> |
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73 |
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74 //}}} |
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75 |
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76 // ------------------------------------------------------------------------- |
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77 // Statics. The host-side assertion code requires two bits of data. |
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78 // |
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79 // The first identifies the function that should actually get invoked |
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80 // when an assertion is triggered. A default implementation is defined |
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81 // in this module, but applications may install a replacement. |
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82 // |
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83 // The second is a table of callback functions that various libraries |
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84 // or bits of application code may install. Each such callback gets invoked |
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85 // when an assertion triggers. |
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86 |
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87 // VC++ bogosity. Using a full function pointer prototype in a template |
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88 // confuses the compiler. It is still possible to declare the callbacks vector, |
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89 // but not any iterators for that vector. A typedef makes the problem go |
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90 // away. |
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91 typedef void (*cyg_callback_fn)(void (*)(const char*)); |
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92 |
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93 // The current assertion handler |
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94 static bool (*current_handler)( const char*, const char*, cyg_uint32, const char*) = 0; |
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95 |
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96 // The callback table. |
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97 static std::vector<std::pair<const char*, cyg_callback_fn> > callbacks; |
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98 |
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99 // ---------------------------------------------------------------------------- |
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100 // Many applications will want to handle assertion failures differently |
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101 // from the default, for example pipe the output into an emacs buffer |
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102 // rather than just generate a file. This routine allows a suitable |
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103 // function to be installed. |
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104 |
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105 extern "C" void |
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106 cyg_assert_install_failure_handler( bool(*fn)(const char*, const char*, cyg_uint32, const char*) ) |
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107 { |
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108 current_handler = fn; |
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109 } |
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110 |
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111 // ---------------------------------------------------------------------------- |
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112 // Various different bits of the system may want to register callback functions |
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113 // that get invoked during an assertion failure and that output useful |
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114 // data. Typically this might happen in the constructor for a static object. |
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115 // A good example of such a callback is the implementation of the trace code. |
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116 // |
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117 // The implementation requires creating a new entry in the static vector. |
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118 // A memory exhaustion exception could occur but there is no sensible way of |
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119 // handling it at this level. |
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120 // |
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121 // Multiple callbacks with the same name are legal. Multiple callbacks with |
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122 // the same function are unlikely, but it is probably not worthwhile raising |
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123 // an exception (especially since this code may be called from C). |
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124 extern "C" void |
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125 cyg_assert_install_failure_callback( const char* name, void (*fn)(void (*)(const char*)) ) |
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126 { |
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127 callbacks.push_back(std::make_pair(name, fn)); |
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128 } |
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129 |
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130 // ------------------------------------------------------------------------- |
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131 // Once an assertion has triggered either the default handler or the |
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132 // installed handler will want to invoke all the callbacks. Rather than |
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133 // provide direct access to the callback table and require the calling |
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134 // code to be in C++, a functional interface is provided instead. |
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135 extern "C" void |
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136 cyg_assert_failure_invoke_callbacks( |
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137 void (*first_fn)(const char*), |
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138 void (*data_fn)(const char*), |
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139 void (*final_fn)(void) ) |
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140 { |
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141 std::vector<std::pair<const char*, cyg_callback_fn> >::const_iterator i; |
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142 |
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143 for ( i = callbacks.begin(); i != callbacks.end(); i++ ) { |
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144 |
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145 if (0 != first_fn) { |
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146 (*first_fn)(i->first); |
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147 } |
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148 if (0 != data_fn) { |
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149 (*(i->second))(data_fn); |
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150 } |
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151 if (0 != final_fn) { |
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152 (*final_fn)(); |
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153 } |
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154 } |
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155 } |
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156 |
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157 // ---------------------------------------------------------------------------- |
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158 // The default assertion handler. This assumes that the application is |
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159 // a console application with a sensible stderr stream. |
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160 // |
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161 // First some initial diagnostics are output immediately, in case |
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162 // subsequent attempts to output more data cause additional failures. It |
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163 // is worthwhile detecting recursive assertion failures. |
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164 // |
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283
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165 // Assuming the table of callbacks is not empty it is possible to |
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166 // output some more data to a file. If possible mkstemp() is used to |
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167 // create this file. If mkstemp() is not available then tmpnam() is |
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168 // used instead. That function has security problems, albeit not ones |
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169 // likely to affect dump files. Once the file is opened the callbacks |
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170 // are invoked. Three utilities have to be provided to do the real |
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171 // work, and a static is used to keep track of the FILE * pointer. |
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172 // |
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173 // The testcase tassert8, and in particular the associated Tcl proc |
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174 // tassert8_filter in testsuite/cyginfra/assert.exp, has detailed |
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175 // knowledge of the output format. Any changes here may need to be |
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176 // reflected in that test case. There are also support routines in |
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177 // hosttest.exp which may need to be updated. |
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178 |
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179 static FILE * default_handler_output_file = 0; |
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180 static bool body_contains_data = false; |
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181 |
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182 // output the callback name |
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183 static void |
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184 default_handler_first_fn(const char* name) |
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185 { |
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186 if (0 != default_handler_output_file) { |
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187 fprintf(default_handler_output_file, "# {{{ %s\n\n", name); |
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188 } |
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189 body_contains_data = false; |
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190 } |
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191 |
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192 // output some actual text. |
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193 static void |
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194 default_handler_second_fn(const char* data) |
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195 { |
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196 body_contains_data = true; |
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197 if (0 != default_handler_output_file) { |
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198 fputs(data, default_handler_output_file); |
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199 } |
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200 } |
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201 |
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202 // the end of a callback. |
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203 static void |
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204 default_handler_final_fn( void ) |
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205 { |
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206 |
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207 if (0 != default_handler_output_file) { |
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208 if (body_contains_data) { |
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209 fputs("\n", default_handler_output_file); |
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210 } |
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211 fputs("# }}}\n", default_handler_output_file); |
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212 } |
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213 } |
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214 |
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215 |
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216 static void |
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217 default_handler(const char* fn, const char* file, cyg_uint32 lineno, const char* msg) |
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218 { |
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219 static int invoke_count = 0; |
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220 if (2 == invoke_count) { |
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221 // The fprintf() immediately below causes an assertion failure |
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222 } else if (1 == invoke_count) { |
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223 invoke_count++; |
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224 fprintf(stderr, "Recursive assertion failure.\n"); |
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225 return; |
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226 } else { |
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227 invoke_count = 1; |
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228 } |
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229 |
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230 // There is an argument for using write() rather than fprintf() here, |
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231 // in case the C library has been corrupted. For now this has not been |
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232 // attempted. |
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233 if (0 == msg) |
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234 msg ="<unknown>"; |
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235 if (0 == file) |
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236 file = "<unknown>"; |
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237 |
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238 fprintf(stderr, "Assertion failure: %s\n", msg); |
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239 fprintf(stderr, "File %s, line number %lu\n", file, (unsigned long) lineno); |
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240 if (0 != fn) |
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241 fprintf(stderr, "Function %s\n", fn); |
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242 |
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243 // Only create a logfile if more information is available. |
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244 if (0 != callbacks.size() ) { |
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283
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245 |
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246 // Use mkstemp() if possible, but only when running on a platform where /tmp |
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247 // is likely to be available. |
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248 #if defined(HAVE_MKSTEMP) && !defined(_MSC_VER) |
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249 char filename[32]; |
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250 int fd; |
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251 strcpy(filename, "/tmp/ecosdump.XXXXXX"); |
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252 fd = mkstemp(filename); |
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253 if (-1 == fd) { |
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254 fprintf(stderr, "Unable to create a suitable output file for additional data.\n"); |
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255 } else { |
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256 default_handler_output_file = fdopen(fd, "w"); |
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257 if (0 == default_handler_output_file) { |
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258 close(fd); |
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259 } |
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260 } |
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261 #else |
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262 char filename[L_tmpnam]; |
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263 if (0 == tmpnam(filename)) { |
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264 fprintf(stderr, "Unable to create a suitable output file for additional data.\n"); |
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265 } else { |
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266 |
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267 // No attempt is made to ensure that the file does not already |
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268 // exist. This would require POSIX calls rather than ISO C ones. |
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269 // The probability of a problem is considered to be too small |
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270 // to worry about. |
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271 default_handler_output_file = fopen(filename, "w"); |
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283
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272 } |
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273 #endif |
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274 if (0 == default_handler_output_file) { |
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275 fprintf(stderr, "Unable to open output file %s\n", filename); |
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276 fputs("No further assertion information is available.\n", stderr); |
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277 } else { |
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278 fprintf(stderr, "Writing additional output to %s\n", filename); |
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279 |
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283
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280 // Repeat the information about the assertion itself. |
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281 fprintf(default_handler_output_file, "Assertion failure: %s\n", msg); |
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282 fprintf(default_handler_output_file, "File %s, line number %lu\n", file, (unsigned long) lineno); |
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283 if (0 != fn) |
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284 fprintf(default_handler_output_file, "Function %s\n", fn); |
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285 fputs("\n", default_handler_output_file); |
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286 |
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283
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287 // Now for the various callbacks. |
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288 cyg_assert_failure_invoke_callbacks( &default_handler_first_fn, |
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289 &default_handler_second_fn, &default_handler_final_fn ); |
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290 |
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283
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291 // And close the file. |
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292 fputs("\nEnd of assertion data.\n", default_handler_output_file); |
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293 fclose(default_handler_output_file); |
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294 } |
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295 } |
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296 fflush(stderr); |
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297 } |
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298 |
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299 // ---------------------------------------------------------------------------- |
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300 // The assertion handler. This is the function that gets invoked when |
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301 // an assertion triggers. If a special assertion handler has been installed |
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302 // then this gets called. If it returns false or if no special handler is |
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303 // available then the default handler gets called instead. Typically the |
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304 // user will now have a lot of information about what happened to cause the |
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305 // assertion failure. The next stage is to invoke abort() which should |
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306 // terminate the program and generate a core dump for subsequent inspection |
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307 // (unless of course the application is already running in a debugger session). |
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308 // A final call to _exit() should be completely redundant. |
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309 |
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310 extern "C" void |
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311 cyg_assert_fail( const char* fn, const char* file, cyg_uint32 lineno, const char* msg ) |
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312 { |
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313 |
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314 if ((0 == current_handler) || !(*current_handler)(fn, file, lineno, msg)) { |
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315 default_handler(fn, file, lineno, msg); |
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316 } |
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317 abort(); |
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318 _exit(0); |
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319 } |
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320 |
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321 // ---------------------------------------------------------------------------- |
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322 // A utility function, primarily intended to be called from inside gdb. |
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323 extern "C" void |
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324 cyg_assert_quickfail(void) |
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325 { |
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326 cyg_assert_fail("gdb", "<no file>", 0, "manual call"); |
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327 } |
