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annotate host/infra/assert.cxx @ 126:518f42066aba ecos-sw-2000-09-19

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Merge from eCos master repository on 2000-09-19-06:25:26-BST
author jlarmour
date Tue, 19 Sep 2000 05:53:51 +0000
parents 435cced73e2f
children e2d866e32dac
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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 //####COPYRIGHTBEGIN####
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11 //
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12 // ----------------------------------------------------------------------------
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13 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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14 //
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15 // This file is part of the eCos host tools.
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16 //
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17 // This program is free software; you can redistribute it and/or modify it
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18 // under the terms of the GNU General Public License as published by the Free
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19 // Software Foundation; either version 2 of the License, or (at your option)
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20 // any later version.
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21 //
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22 // This program is distributed in the hope that it will be useful, but WITHOUT
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23 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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24 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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25 // more details.
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26 //
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27 // You should have received a copy of the GNU General Public License along with
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28 // this program; if not, write to the Free Software Foundation, Inc.,
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29 // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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30 //
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31 // ----------------------------------------------------------------------------
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32 //
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33 //####COPYRIGHTEND####
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34 //============================================================================
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35 //#####DESCRIPTIONBEGIN####
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36 //
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37 // Author(s): bartv
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38 // Contact(s): bartv
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39 // Date: 1998/11/27
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40 // Version: 0.01
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41 // Purpose: To provide a host-side implementation of the eCos assertion
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42 // facilities.
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43 //
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44 //####DESCRIPTIONEND####
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45 //============================================================================
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46
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47 //}}}
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48 //{{{ #include's
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49
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50 #include "pkgconf/infra.h"
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51 #include "cyg/infra/cyg_type.h"
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52 // Without this symbol the header file has no effect
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53 #define CYGDBG_USE_TRACING
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54 // Make sure that the host-side extensions get prototyped
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55 // as well.
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56 #define CYG_DECLARE_HOST_ASSERTION_SUPPORT
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57 #include "cyg/infra/cyg_ass.h"
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58
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59 // STDIO is needed for the default assertion handler.
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60 // STDLIB is needed for exit() and the status codes.
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61 #include <cstdio>
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62 #include <cstdlib>
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63
126
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64 #ifdef __unix__
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65 extern "C" {
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66 #include <unistd.h> // Needed for _exit()
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67 }
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68 #endif
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69
76
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70 // These are needed for the table of callbacks.
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71 #include <utility>
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72 #include <iterator>
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73 #include <vector>
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74
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75 //}}}
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76
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77 // -------------------------------------------------------------------------
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78 // Statics. The host-side assertion code requires two bits of data.
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79 //
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80 // The first identifies the function that should actually get invoked
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81 // when an assertion is triggered. A default implementation is defined
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82 // in this module, but applications may install a replacement.
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83 //
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84 // The second is a table of callback functions that various libraries
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85 // or bits of application code may install. Each such callback gets invoked
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86 // when an assertion triggers.
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87
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88 // VC++ bogosity. Using a full function pointer prototype in a template
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89 // confuses the compiler. It is still possible to declare the callbacks vector,
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90 // but not any iterators for that vector. A typedef makes the problem go
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91 // away.
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92 typedef void (*cyg_callback_fn)(void (*)(const char*));
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93
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94 // The current assertion handler
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95 static bool (*current_handler)( const char*, const char*, cyg_uint32, const char*) = 0;
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96
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97 // The callback table.
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98 static std::vector<std::pair<const char*, cyg_callback_fn> > callbacks;
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99
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100 // ----------------------------------------------------------------------------
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101 // Many applications will want to handle assertion failures differently
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102 // from the default, for example pipe the output into an emacs buffer
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103 // rather than just generate a file. This routine allows a suitable
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104 // function to be installed.
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105
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106 extern "C" void
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107 cyg_assert_install_failure_handler( bool(*fn)(const char*, const char*, cyg_uint32, const char*) )
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108 {
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109 current_handler = fn;
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110 }
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111
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112 // ----------------------------------------------------------------------------
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113 // Various different bits of the system may want to register callback functions
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114 // that get invoked during an assertion failure and that output useful
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115 // data. Typically this might happen in the constructor for a static object.
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116 // A good example of such a callback is the implementation of the trace code.
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117 //
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118 // The implementation requires creating a new entry in the static vector.
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119 // A memory exhaustion exception could occur but there is no sensible way of
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120 // handling it at this level.
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121 //
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122 // Multiple callbacks with the same name are legal. Multiple callbacks with
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123 // the same function are unlikely, but it is probably not worthwhile raising
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124 // an exception (especially since this code may be called from C).
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125 extern "C" void
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126 cyg_assert_install_failure_callback( const char* name, void (*fn)(void (*)(const char*)) )
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127 {
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128 callbacks.push_back(std::make_pair(name, fn));
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129 }
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130
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131 // -------------------------------------------------------------------------
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132 // Once an assertion has triggered either the default handler or the
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133 // installed handler will want to invoke all the callbacks. Rather than
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134 // provide direct access to the callback table and require the calling
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135 // code to be in C++, a functional interface is provided instead.
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136 extern "C" void
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137 cyg_assert_failure_invoke_callbacks(
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138 void (*first_fn)(const char*),
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139 void (*data_fn)(const char*),
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140 void (*final_fn)(void) )
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141 {
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142 std::vector<std::pair<const char*, cyg_callback_fn> >::const_iterator i;
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143
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144 for ( i = callbacks.begin(); i != callbacks.end(); i++ ) {
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145
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146 if (0 != first_fn) {
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147 (*first_fn)(i->first);
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148 }
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149 if (0 != data_fn) {
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150 (*(i->second))(data_fn);
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151 }
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152 if (0 != final_fn) {
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153 (*final_fn)();
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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 // ----------------------------------------------------------------------------
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159 // The default assertion handler. This assumes that the application is
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160 // a console application with a sensible stderr stream.
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161 //
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162 // First some initial diagnostics are output immediately, in case
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163 // subsequent attempts to output more data cause additional failures. It
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164 // is worthwhile detecting recursive assertion failures.
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165 //
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166 // Assuming the table of callbacks is not empty it is possible to output
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167 // some more data to a file. The tmpnam() function is used to get a filename.
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168 // The file is opened and the callbacks are invoked. Three utilities have to
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169 // be provided to do the real work, and a static is used to keep track of the
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170 // FILE * pointer.
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171 //
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172 // The testcase tassert8, and in particular the associated Tcl proc
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173 // tassert8_filter in testsuite/cyginfra/assert.exp, has detailed
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174 // knowledge of the output format. Any changes here may need to be
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175 // reflected in that test case. There are also support routines in
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176 // hosttest.exp which may need to be updated.
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177
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178 static FILE * default_handler_output_file = 0;
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179 static bool body_contains_data = false;
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180
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181 // output the callback name
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182 static void
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183 default_handler_first_fn(const char* name)
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184 {
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185 if (0 != default_handler_output_file) {
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186 fprintf(default_handler_output_file, "# {{{ %s\n\n", name);
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187 }
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188 body_contains_data = false;
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189 }
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190
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191 // output some actual text.
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192 static void
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193 default_handler_second_fn(const char* data)
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194 {
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195 body_contains_data = true;
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196 if (0 != default_handler_output_file) {
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197 fputs(data, default_handler_output_file);
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198 }
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199 }
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200
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201 // the end of a callback.
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202 static void
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203 default_handler_final_fn( void )
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204 {
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205
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206 if (0 != default_handler_output_file) {
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207 if (body_contains_data) {
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208 fputs("\n", default_handler_output_file);
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209 }
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210 fputs("# }}}\n", default_handler_output_file);
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211 }
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212 }
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213
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214
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215 static void
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216 default_handler(const char* fn, const char* file, cyg_uint32 lineno, const char* msg)
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217 {
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218 static int invoke_count = 0;
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219 if (2 == invoke_count) {
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220 // The fprintf() immediately below causes an assertion failure
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221 } else if (1 == invoke_count) {
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222 invoke_count++;
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223 fprintf(stderr, "Recursive assertion failure.\n");
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224 return;
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225 } else {
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226 invoke_count = 1;
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227 }
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228
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229 // There is an argument for using write() rather than fprintf() here,
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230 // in case the C library has been corrupted. For now this has not been
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231 // attempted.
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232 if (0 == msg)
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233 msg ="<unknown>";
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234 if (0 == file)
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235 file = "<unknown>";
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236
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237 fprintf(stderr, "Assertion failure: %s\n", msg);
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238 fprintf(stderr, "File %s, line number %lu\n", file, (unsigned long) lineno);
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239 if (0 != fn)
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240 fprintf(stderr, "Function %s\n", fn);
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241
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242 // Only create a logfile if more information is available.
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243 if (0 != callbacks.size() ) {
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244 char filename[L_tmpnam];
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245 if (0 == tmpnam(filename)) {
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246 fprintf(stderr, "Unable to create a suitable output file for additional data.\n");
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247 } else {
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248
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249 // No attempt is made to ensure that the file does not already
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250 // exist. This would require POSIX calls rather than ISO C ones.
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251 // The probability of a problem is considered to be too small
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252 // to worry about.
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253 default_handler_output_file = fopen(filename, "w");
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254 if (0 == default_handler_output_file) {
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255 fprintf(stderr, "Unable to open output file %s\n", filename);
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256 fputs("No further assertion information is available.\n", stderr);
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257 } else {
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258 fprintf(stderr, "Writing additional output to %s\n", filename);
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259
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260 // Repeat the information about the assertion itself.
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261 fprintf(default_handler_output_file, "Assertion failure: %s\n", msg);
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262 fprintf(default_handler_output_file, "File %s, line number %lu\n", file, (unsigned long) lineno);
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263 if (0 != fn)
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264 fprintf(default_handler_output_file, "Function %s\n", fn);
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265 fputs("\n", default_handler_output_file);
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266
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267 // Now for the various callbacks.
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268 cyg_assert_failure_invoke_callbacks( &default_handler_first_fn,
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269 &default_handler_second_fn, &default_handler_final_fn );
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270
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271 // And close the file.
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272 fputs("\nEnd of assertion data.\n", default_handler_output_file);
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273 fclose(default_handler_output_file);
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274 }
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275 }
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276 }
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277 fflush(stderr);
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278 }
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279
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280 // ----------------------------------------------------------------------------
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281 // The assertion handler. This is the function that gets invoked when
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282 // an assertion triggers. If a special assertion handler has been installed
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283 // then this gets called. If it returns false or if no special handler is
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284 // available then the default handler gets called instead. Typically the
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285 // user will now have a lot of information about what happened to cause the
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286 // assertion failure. The next stage is to invoke abort() which should
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287 // terminate the program and generate a core dump for subsequent inspection
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288 // (unless of course the application is already running in a debugger session).
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289 // A final call to _exit() should be completely redundant.
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290
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291 extern "C" void
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292 cyg_assert_fail( const char* fn, const char* file, cyg_uint32 lineno, const char* msg )
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293 {
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294
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295 if ((0 == current_handler) || !(*current_handler)(fn, file, lineno, msg)) {
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296 default_handler(fn, file, lineno, msg);
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297 }
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298 abort();
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299 _exit(0);
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300 }
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301
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302 // ----------------------------------------------------------------------------
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303 // A utility function, primarily intended to be called from inside gdb.
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304 extern "C" void
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305 cyg_assert_quickfail(void)
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306 {
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307 cyg_assert_fail("gdb", "<no file>", 0, "manual call");
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308 }