1 | // name-finder.cc - Convert addresses to names |
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2 | |
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3 | /* Copyright (C) 2000 Red Hat Inc |
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4 | |
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5 | This file is part of libgcj. |
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6 | |
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7 | This software is copyrighted work licensed under the terms of the |
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8 | Libgcj License. Please consult the file "LIBGCJ_LICENSE" for |
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9 | details. */ |
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10 | |
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11 | /** |
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12 | * @author Andrew Haley <aph@cygnus.com> |
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13 | * @date Jan 6 2000 |
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14 | */ |
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15 | |
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16 | /* _Jv_name_finder is a class wrapper around a mechanism that can |
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17 | convert address of methods to their names and the names of files in |
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18 | which they appear. |
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19 | |
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20 | Right now, the only implementation of this involves running a copy |
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21 | of addr2line, but at some point it is worth building this |
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22 | functionality into libgcj, if only for embedded systems. */ |
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23 | |
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24 | |
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25 | #ifndef _GNU_SOURCE |
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26 | #define _GNU_SOURCE 1 |
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27 | #endif |
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28 | |
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29 | #include <config.h> |
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30 | |
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31 | #include <string.h> |
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32 | |
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33 | #include <gcj/cni.h> |
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34 | #include <jvm.h> |
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35 | #include <java/lang/Object.h> |
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36 | #include <java-threads.h> |
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37 | #include <java/lang/Throwable.h> |
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38 | #include <java/io/PrintStream.h> |
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39 | #include <java/io/PrintWriter.h> |
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40 | |
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41 | #include <sys/types.h> |
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42 | |
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43 | #include <stdlib.h> |
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44 | #include <stdio.h> |
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45 | |
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46 | #ifdef HAVE_UNISTD_H |
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47 | #include <unistd.h> |
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48 | #endif |
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49 | |
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50 | #ifdef HAVE_DLFCN_H |
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51 | #include <dlfcn.h> |
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52 | #endif |
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53 | |
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54 | #include <name-finder.h> |
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55 | |
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56 | /* Create a new name finder which will perform address lookups on an |
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57 | executable. */ |
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58 | |
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59 | _Jv_name_finder::_Jv_name_finder (char *executable) |
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60 | { |
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61 | #if defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP) |
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62 | error = 0; |
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63 | |
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64 | char *argv[6]; |
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65 | { |
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66 | int arg = 0; |
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67 | #ifdef __ia64__ |
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68 | argv[arg++] = "addr2name.awk"; |
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69 | #else |
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70 | argv[arg++] = "addr2line"; |
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71 | argv[arg++] = "-C"; |
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72 | argv[arg++] = "-f"; |
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73 | argv[arg++] = "-e"; |
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74 | #endif |
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75 | argv[arg++] = executable; |
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76 | argv[arg] = NULL; |
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77 | } |
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78 | |
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79 | error |= pipe (f_pipe) < 0; |
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80 | error |= pipe (b_pipe) < 0; |
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81 | |
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82 | if (error) |
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83 | return; |
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84 | |
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85 | pid = fork (); |
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86 | if (pid == 0) |
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87 | { |
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88 | close (f_pipe[1]); |
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89 | close (b_pipe[0]); |
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90 | dup2 (f_pipe[0], fileno (stdin)); |
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91 | dup2 (b_pipe[1], fileno (stdout)); |
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92 | execvp (argv[0], argv); |
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93 | _exit (127); |
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94 | } |
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95 | |
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96 | close (f_pipe [0]); |
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97 | close (b_pipe [1]); |
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98 | |
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99 | if (pid < 0) |
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100 | { |
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101 | error |= 1; |
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102 | return; |
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103 | } |
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104 | |
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105 | b_pipe_fd = fdopen (b_pipe[0], "r"); |
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106 | error |= !b_pipe_fd; |
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107 | #endif |
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108 | } |
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109 | |
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110 | /* Convert a pointer to hex. */ |
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111 | |
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112 | void |
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113 | _Jv_name_finder::toHex (void *p) |
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114 | { |
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115 | unsigned long long n = (unsigned long long)p; |
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116 | int digits = sizeof (void *) * 2; |
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117 | |
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118 | strcpy (hex, "0x"); |
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119 | for (int i = digits - 1; i >= 0; i--) |
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120 | { |
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121 | int digit = n % 16; |
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122 | |
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123 | n /= 16; |
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124 | hex[i+2] = digit > 9 ? 'a' + digit - 10 : '0' + digit; |
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125 | } |
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126 | hex [digits+2] = 0; |
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127 | } |
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128 | |
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129 | /* Given a pointer to a function or method, try to convert it into a |
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130 | name and the appropriate line and source file. The caller passes |
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131 | the code pointer in p. |
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132 | |
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133 | Returns false if the lookup fails. Even if this happens, the field |
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134 | he will have been correctly filled in with the pointer. */ |
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135 | |
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136 | bool |
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137 | _Jv_name_finder::lookup (void *p) |
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138 | { |
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139 | extern char **_Jv_argv; |
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140 | toHex (p); |
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141 | |
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142 | #if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR) |
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143 | { |
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144 | Dl_info dl_info; |
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145 | |
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146 | if (dladdr (p, &dl_info)) |
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147 | { |
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148 | if (dl_info.dli_fname) |
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149 | strncpy (file_name, dl_info.dli_fname, sizeof file_name); |
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150 | if (dl_info.dli_sname) |
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151 | strncpy (method_name, dl_info.dli_sname, sizeof method_name); |
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152 | |
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153 | /* Don't trust dladdr() if the address is from the main program. */ |
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154 | if (dl_info.dli_fname != NULL |
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155 | && dl_info.dli_sname != NULL |
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156 | && (_Jv_argv == NULL || strcmp (file_name, _Jv_argv[0]) != 0)) |
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157 | return true; |
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158 | } |
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159 | } |
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160 | #endif |
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161 | |
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162 | #if defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP) |
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163 | if (error) |
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164 | return false; |
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165 | |
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166 | error |= write (f_pipe[1], hex, strlen (hex)) < 0; |
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167 | if (error) |
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168 | return false; |
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169 | error |= write (f_pipe[1], "\n", 1) < 0; |
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170 | if (error) |
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171 | return false; |
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172 | |
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173 | error |= (fgets (method_name, sizeof method_name, b_pipe_fd) == NULL); |
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174 | if (error) |
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175 | return false; |
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176 | error |= (fgets (file_name, sizeof file_name, b_pipe_fd) == NULL); |
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177 | if (error) |
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178 | return false; |
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179 | |
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180 | char *newline = strchr (method_name, '\n'); |
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181 | if (newline) |
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182 | *newline = 0; |
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183 | newline = strchr (file_name, '\n'); |
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184 | if (newline) |
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185 | *newline = 0; |
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186 | |
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187 | return true; |
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188 | |
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189 | #else |
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190 | return false; |
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191 | #endif /* defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP) */ |
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192 | } |
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