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1 /* Copyright (C) 2006-2020 Free Software Foundation, Inc.
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2 Contributed by François-Xavier Coudert
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3
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4 This file is part of the GNU Fortran runtime library (libgfortran).
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5
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6 Libgfortran is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgfortran is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #include "libgfortran.h"
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26
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27 #include <gthr.h>
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28
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29 #include <string.h>
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30 #include <errno.h>
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31
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32 #ifdef HAVE_UNISTD_H
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33 #include <unistd.h>
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34 #endif
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35
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36 #include "backtrace-supported.h"
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37 #include "backtrace.h"
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38
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39
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40 /* Store our own state while backtracing. */
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41 struct mystate
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42 {
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43 int frame;
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44 bool try_simple;
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45 bool in_signal_handler;
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46 };
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47
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48
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49 /* Does a function name have "_gfortran_" or "_gfortrani_" prefix, possibly
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50 with additional underscore(s) at the beginning? Cannot use strncmp()
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51 because we might be called from a signal handler. */
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52
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53 static int
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54 has_gfortran_prefix (const char *s)
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55 {
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56 if (!s)
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57 return 0;
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58
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59 while (*s == '_')
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60 s++;
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61
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62 return (s[0] == 'g' && s[1] == 'f' && s[2] == 'o' && s[3] == 'r'
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63 && s[4] == 't' && s[5] == 'r' && s[6] == 'a' && s[7] == 'n'
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64 && (s[8] == '_' || (s[8] == 'i' && s[9] == '_')));
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65 }
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66
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67 static void
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68 error_callback (void *data, const char *msg, int errnum)
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69 {
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70 struct mystate *state = (struct mystate *) data;
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71 struct iovec iov[5];
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72 #define ERRHDR "\nCould not print backtrace: "
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73
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74 if (errnum < 0)
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75 {
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76 state->try_simple = true;
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77 return;
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78 }
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79 else if (errnum == 0)
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80 {
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81 iov[0].iov_base = (char*) ERRHDR;
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82 iov[0].iov_len = strlen (ERRHDR);
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83 iov[1].iov_base = (char*) msg;
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84 iov[1].iov_len = strlen (msg);
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85 iov[2].iov_base = (char*) "\n";
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86 iov[2].iov_len = 1;
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87 estr_writev (iov, 3);
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111
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88 }
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89 else
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90 {
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91 char errbuf[256];
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92 if (state->in_signal_handler)
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93 {
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94 iov[0].iov_base = (char*) ERRHDR;
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95 iov[0].iov_len = strlen (ERRHDR);
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96 iov[1].iov_base = (char*) msg;
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97 iov[1].iov_len = strlen (msg);
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98 iov[2].iov_base = (char*) ", errno: ";
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99 iov[2].iov_len = strlen (iov[2].iov_base);
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100 const char *p = gfc_itoa (errnum, errbuf, sizeof (errbuf));
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101 iov[3].iov_base = (char*) p;
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102 iov[3].iov_len = strlen (p);
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103 iov[4].iov_base = (char*) "\n";
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104 iov[4].iov_len = 1;
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105 estr_writev (iov, 5);
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111
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106 }
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107 else
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108 st_printf (ERRHDR "%s: %s\n", msg,
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109 gf_strerror (errnum, errbuf, sizeof (errbuf)));
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110 }
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111 }
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112
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113 static int
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114 simple_callback (void *data, uintptr_t pc)
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115 {
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116 struct mystate *state = (struct mystate *) data;
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117 st_printf ("#%d 0x%lx\n", state->frame, (unsigned long) pc);
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118 (state->frame)++;
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119 return 0;
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120 }
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121
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122 static int
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123 full_callback (void *data, uintptr_t pc, const char *filename,
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124 int lineno, const char *function)
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125 {
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126 struct mystate *state = (struct mystate *) data;
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127
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128 if (has_gfortran_prefix (function))
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129 return 0;
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130
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131 st_printf ("#%d 0x%lx in %s\n", state->frame,
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132 (unsigned long) pc, function == NULL ? "???" : function);
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133 if (filename || lineno != 0)
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134 st_printf ("\tat %s:%d\n", filename == NULL ? "???" : filename, lineno);
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135 (state->frame)++;
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136
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137 if (function != NULL && strcmp (function, "main") == 0)
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138 return 1;
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139
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140 return 0;
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141 }
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142
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143
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144 /* Display the backtrace. */
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145
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146 void
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147 show_backtrace (bool in_signal_handler)
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148 {
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145
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149 /* Note that libbacktrace allows the state to be accessed from
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150 multiple threads, so we don't need to use a TLS variable for the
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151 state here. */
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152 static struct backtrace_state *lbstate_saved;
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153 struct backtrace_state *lbstate;
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154 struct mystate state = { 0, false, in_signal_handler };
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155
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156 lbstate = __atomic_load_n (&lbstate_saved, __ATOMIC_RELAXED);
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157 if (!lbstate)
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158 {
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159 lbstate = backtrace_create_state (NULL, __gthread_active_p (),
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160 error_callback, NULL);
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161 if (lbstate)
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162 __atomic_store_n (&lbstate_saved, lbstate, __ATOMIC_RELAXED);
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163 else
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164 return;
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165 }
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111
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166
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167 if (!BACKTRACE_SUPPORTED || (in_signal_handler && BACKTRACE_USES_MALLOC))
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168 {
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169 /* If symbolic backtrace is not supported on this target, or would
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170 require malloc() and we are in a signal handler, go with a
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171 simple backtrace. */
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172
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173 backtrace_simple (lbstate, 0, simple_callback, error_callback, &state);
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174 }
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175 else
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176 {
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177 /* libbacktrace uses mmap, which is safe to call from a signal handler
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178 (in practice, if not in theory). Thus we can generate a symbolic
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179 backtrace, if debug symbols are available. */
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180
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181 backtrace_full (lbstate, 0, full_callback, error_callback, &state);
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182 if (state.try_simple)
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183 backtrace_simple (lbstate, 0, simple_callback, error_callback, &state);
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184 }
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185 }
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186
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187
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188
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189 /* Function called by the front-end translating the BACKTRACE intrinsic. */
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190
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191 extern void backtrace (void);
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192 export_proto (backtrace);
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193
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194 void
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195 backtrace (void)
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196 {
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197 show_backtrace (false);
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198 }
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199
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