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  16. <title>Frame Info (Debugging with GDB)</title>
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  57. <a name="Frame-Info"></a>
  58. <div class="header">
  59. <p>
  60. Next: <a href="Frame-Apply.html#Frame-Apply" accesskey="n" rel="next">Frame Apply</a>, Previous: <a href="Selection.html#Selection" accesskey="p" rel="prev">Selection</a>, Up: <a href="Stack.html#Stack" accesskey="u" rel="up">Stack</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
  61. </div>
  62. <hr>
  63. <a name="Information-About-a-Frame"></a>
  64. <h3 class="section">8.4 Information About a Frame</h3>
  65. <p>There are several other commands to print information about the selected
  66. stack frame.
  67. </p>
  68. <dl compact="compact">
  69. <dt><code>frame</code></dt>
  70. <dt><code>f</code></dt>
  71. <dd><p>When used without any argument, this command does not change which
  72. frame is selected, but prints a brief description of the currently
  73. selected stack frame. It can be abbreviated <code>f</code>. With an
  74. argument, this command is used to select a stack frame.
  75. See <a href="Selection.html#Selection">Selecting a Frame</a>.
  76. </p>
  77. <a name="index-info-frame"></a>
  78. <a name="index-info-f-_0028info-frame_0029"></a>
  79. </dd>
  80. <dt><code>info frame</code></dt>
  81. <dt><code>info f</code></dt>
  82. <dd><p>This command prints a verbose description of the selected stack frame,
  83. including:
  84. </p>
  85. <ul>
  86. <li> the address of the frame
  87. </li><li> the address of the next frame down (called by this frame)
  88. </li><li> the address of the next frame up (caller of this frame)
  89. </li><li> the language in which the source code corresponding to this frame is written
  90. </li><li> the address of the frame&rsquo;s arguments
  91. </li><li> the address of the frame&rsquo;s local variables
  92. </li><li> the program counter saved in it (the address of execution in the caller frame)
  93. </li><li> which registers were saved in the frame
  94. </li></ul>
  95. <p>The verbose description is useful when
  96. something has gone wrong that has made the stack format fail to fit
  97. the usual conventions.
  98. </p>
  99. </dd>
  100. <dt><code>info frame <span class="roman">[</span> <var>frame-selection-spec</var> <span class="roman">]</span></code></dt>
  101. <dt><code>info f <span class="roman">[</span> <var>frame-selection-spec</var> <span class="roman">]</span></code></dt>
  102. <dd><p>Print a verbose description of the frame selected by
  103. <var>frame-selection-spec</var>. The <var>frame-selection-spec</var> is the
  104. same as for the <code>frame</code> command (see <a href="Selection.html#Selection">Selecting
  105. a Frame</a>). The selected frame remains unchanged by this command.
  106. </p>
  107. <a name="index-info-args"></a>
  108. </dd>
  109. <dt><code>info args [-q]</code></dt>
  110. <dd><p>Print the arguments of the selected frame, each on a separate line.
  111. </p>
  112. <p>The optional flag &lsquo;<samp>-q</samp>&rsquo;, which stands for &lsquo;<samp>quiet</samp>&rsquo;, disables
  113. printing header information and messages explaining why no argument
  114. have been printed.
  115. </p>
  116. </dd>
  117. <dt><code>info args [-q] [-t <var>type_regexp</var>] [<var>regexp</var>]</code></dt>
  118. <dd><p>Like <kbd>info args</kbd>, but only print the arguments selected
  119. with the provided regexp(s).
  120. </p>
  121. <p>If <var>regexp</var> is provided, print only the arguments whose names
  122. match the regular expression <var>regexp</var>.
  123. </p>
  124. <p>If <var>type_regexp</var> is provided, print only the arguments whose
  125. types, as printed by the <code>whatis</code> command, match
  126. the regular expression <var>type_regexp</var>.
  127. If <var>type_regexp</var> contains space(s), it should be enclosed in
  128. quote characters. If needed, use backslash to escape the meaning
  129. of special characters or quotes.
  130. </p>
  131. <p>If both <var>regexp</var> and <var>type_regexp</var> are provided, an argument
  132. is printed only if its name matches <var>regexp</var> and its type matches
  133. <var>type_regexp</var>.
  134. </p>
  135. </dd>
  136. <dt><code>info locals [-q]</code></dt>
  137. <dd><a name="index-info-locals"></a>
  138. <p>Print the local variables of the selected frame, each on a separate
  139. line. These are all variables (declared either static or automatic)
  140. accessible at the point of execution of the selected frame.
  141. </p>
  142. <p>The optional flag &lsquo;<samp>-q</samp>&rsquo;, which stands for &lsquo;<samp>quiet</samp>&rsquo;, disables
  143. printing header information and messages explaining why no local variables
  144. have been printed.
  145. </p>
  146. </dd>
  147. <dt><code>info locals [-q] [-t <var>type_regexp</var>] [<var>regexp</var>]</code></dt>
  148. <dd><p>Like <kbd>info locals</kbd>, but only print the local variables selected
  149. with the provided regexp(s).
  150. </p>
  151. <p>If <var>regexp</var> is provided, print only the local variables whose names
  152. match the regular expression <var>regexp</var>.
  153. </p>
  154. <p>If <var>type_regexp</var> is provided, print only the local variables whose
  155. types, as printed by the <code>whatis</code> command, match
  156. the regular expression <var>type_regexp</var>.
  157. If <var>type_regexp</var> contains space(s), it should be enclosed in
  158. quote characters. If needed, use backslash to escape the meaning
  159. of special characters or quotes.
  160. </p>
  161. <p>If both <var>regexp</var> and <var>type_regexp</var> are provided, a local variable
  162. is printed only if its name matches <var>regexp</var> and its type matches
  163. <var>type_regexp</var>.
  164. </p>
  165. <p>The command <kbd>info locals -q -t <var>type_regexp</var></kbd> can usefully be
  166. combined with the commands <kbd>frame apply</kbd> and <kbd>thread apply</kbd>.
  167. For example, your program might use Resource Acquisition Is
  168. Initialization types (RAII) such as <code>lock_something_t</code>: each
  169. local variable of type <code>lock_something_t</code> automatically places a
  170. lock that is destroyed when the variable goes out of scope. You can
  171. then list all acquired locks in your program by doing
  172. </p><div class="smallexample">
  173. <pre class="smallexample">thread apply all -s frame apply all -s info locals -q -t lock_something_t
  174. </pre></div>
  175. <p>or the equivalent shorter form
  176. </p><div class="smallexample">
  177. <pre class="smallexample">tfaas i lo -q -t lock_something_t
  178. </pre></div>
  179. </dd>
  180. </dl>
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