441 lines
19 KiB
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441 lines
19 KiB
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<title>GDB/MI Stack Manipulation - Debugging with GDB</title>
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="GDB_002fMI.html#GDB_002fMI" title="GDB/MI">
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<link rel="prev" href="GDB_002fMI-Program-Execution.html#GDB_002fMI-Program-Execution" title="GDB/MI Program Execution">
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<link rel="next" href="GDB_002fMI-Variable-Objects.html#GDB_002fMI-Variable-Objects" title="GDB/MI Variable Objects">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Free Software'' and ``Free Software Needs
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Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="GDB%2fMI-Stack-Manipulation"></a>
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<a name="GDB_002fMI-Stack-Manipulation"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="GDB_002fMI-Variable-Objects.html#GDB_002fMI-Variable-Objects">GDB/MI Variable Objects</a>,
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Previous: <a rel="previous" accesskey="p" href="GDB_002fMI-Program-Execution.html#GDB_002fMI-Program-Execution">GDB/MI Program Execution</a>,
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Up: <a rel="up" accesskey="u" href="GDB_002fMI.html#GDB_002fMI">GDB/MI</a>
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<hr>
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</div>
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<h3 class="section">27.14 <span class="sc">gdb/mi</span> Stack Manipulation Commands</h3>
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<h4 class="subheading">The <code>-enable-frame-filters</code> Command</h4>
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<p><a name="index-g_t_002denable_002dframe_002dfilters-3019"></a>
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<pre class="smallexample"> -enable-frame-filters
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</pre>
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<p><span class="sc">gdb</span> allows Python-based frame filters to affect the output of
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the MI commands relating to stack traces. As there is no way to
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implement this in a fully backward-compatible way, a front end must
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request that this functionality be enabled.
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<p>Once enabled, this feature cannot be disabled.
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<p>Note that if Python support has not been compiled into <span class="sc">gdb</span>,
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this command will still succeed (and do nothing).
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<h4 class="subheading">The <code>-stack-info-frame</code> Command</h4>
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<p><a name="index-g_t_002dstack_002dinfo_002dframe-3020"></a>
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<h5 class="subsubheading">Synopsis</h5>
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<pre class="smallexample"> -stack-info-frame
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</pre>
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<p>Get info on the selected frame.
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<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
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<p>The corresponding <span class="sc">gdb</span> command is ‘<samp><span class="samp">info frame</span></samp>’ or ‘<samp><span class="samp">frame</span></samp>’
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(without arguments).
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<h5 class="subsubheading">Example</h5>
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<pre class="smallexample"> (gdb)
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-stack-info-frame
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^done,frame={level="1",addr="0x0001076c",func="callee3",
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file="../../../devo/gdb/testsuite/gdb.mi/basics.c",
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fullname="/home/foo/bar/devo/gdb/testsuite/gdb.mi/basics.c",line="17",
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arch="i386:x86_64"}
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(gdb)
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</pre>
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<h4 class="subheading">The <code>-stack-info-depth</code> Command</h4>
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<p><a name="index-g_t_002dstack_002dinfo_002ddepth-3021"></a>
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<h5 class="subsubheading">Synopsis</h5>
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<pre class="smallexample"> -stack-info-depth [ <var>max-depth</var> ]
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</pre>
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<p>Return the depth of the stack. If the integer argument <var>max-depth</var>
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is specified, do not count beyond <var>max-depth</var> frames.
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<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
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<p>There's no equivalent <span class="sc">gdb</span> command.
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<h5 class="subsubheading">Example</h5>
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<p>For a stack with frame levels 0 through 11:
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<pre class="smallexample"> (gdb)
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-stack-info-depth
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^done,depth="12"
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(gdb)
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-stack-info-depth 4
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^done,depth="4"
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(gdb)
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-stack-info-depth 12
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^done,depth="12"
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(gdb)
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-stack-info-depth 11
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^done,depth="11"
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(gdb)
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-stack-info-depth 13
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^done,depth="12"
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(gdb)
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</pre>
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<p><a name="g_t_002dstack_002dlist_002darguments"></a>
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<h4 class="subheading">The <code>-stack-list-arguments</code> Command</h4>
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<p><a name="index-g_t_002dstack_002dlist_002darguments-3022"></a>
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<h5 class="subsubheading">Synopsis</h5>
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<pre class="smallexample"> -stack-list-arguments [ --no-frame-filters ] [ --skip-unavailable ] <var>print-values</var>
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[ <var>low-frame</var> <var>high-frame</var> ]
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</pre>
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<p>Display a list of the arguments for the frames between <var>low-frame</var>
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and <var>high-frame</var> (inclusive). If <var>low-frame</var> and
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<var>high-frame</var> are not provided, list the arguments for the whole
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call stack. If the two arguments are equal, show the single frame
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at the corresponding level. It is an error if <var>low-frame</var> is
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larger than the actual number of frames. On the other hand,
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<var>high-frame</var> may be larger than the actual number of frames, in
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which case only existing frames will be returned.
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<p>If <var>print-values</var> is 0 or <code>--no-values</code>, print only the names of
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the variables; if it is 1 or <code>--all-values</code>, print also their
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values; and if it is 2 or <code>--simple-values</code>, print the name,
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type and value for simple data types, and the name and type for arrays,
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structures and unions. If the option <code>--no-frame-filters</code> is
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supplied, then Python frame filters will not be executed.
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<p>If the <code>--skip-unavailable</code> option is specified, arguments that
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are not available are not listed. Partially available arguments
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are still displayed, however.
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<p>Use of this command to obtain arguments in a single frame is
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deprecated in favor of the ‘<samp><span class="samp">-stack-list-variables</span></samp>’ command.
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<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
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<p><span class="sc">gdb</span> does not have an equivalent command. <code>gdbtk</code> has a
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‘<samp><span class="samp">gdb_get_args</span></samp>’ command which partially overlaps with the
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functionality of ‘<samp><span class="samp">-stack-list-arguments</span></samp>’.
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<h5 class="subsubheading">Example</h5>
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<pre class="smallexample"> (gdb)
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-stack-list-frames
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^done,
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stack=[
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frame={level="0",addr="0x00010734",func="callee4",
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file="../../../devo/gdb/testsuite/gdb.mi/basics.c",
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fullname="/home/foo/bar/devo/gdb/testsuite/gdb.mi/basics.c",line="8",
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arch="i386:x86_64"},
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frame={level="1",addr="0x0001076c",func="callee3",
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file="../../../devo/gdb/testsuite/gdb.mi/basics.c",
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fullname="/home/foo/bar/devo/gdb/testsuite/gdb.mi/basics.c",line="17",
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arch="i386:x86_64"},
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frame={level="2",addr="0x0001078c",func="callee2",
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file="../../../devo/gdb/testsuite/gdb.mi/basics.c",
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fullname="/home/foo/bar/devo/gdb/testsuite/gdb.mi/basics.c",line="22",
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arch="i386:x86_64"},
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frame={level="3",addr="0x000107b4",func="callee1",
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file="../../../devo/gdb/testsuite/gdb.mi/basics.c",
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fullname="/home/foo/bar/devo/gdb/testsuite/gdb.mi/basics.c",line="27",
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arch="i386:x86_64"},
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frame={level="4",addr="0x000107e0",func="main",
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file="../../../devo/gdb/testsuite/gdb.mi/basics.c",
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fullname="/home/foo/bar/devo/gdb/testsuite/gdb.mi/basics.c",line="32",
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arch="i386:x86_64"}]
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(gdb)
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-stack-list-arguments 0
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^done,
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stack-args=[
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frame={level="0",args=[]},
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frame={level="1",args=[name="strarg"]},
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frame={level="2",args=[name="intarg",name="strarg"]},
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frame={level="3",args=[name="intarg",name="strarg",name="fltarg"]},
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frame={level="4",args=[]}]
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(gdb)
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-stack-list-arguments 1
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^done,
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stack-args=[
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frame={level="0",args=[]},
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frame={level="1",
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args=[{name="strarg",value="0x11940 \"A string argument.\""}]},
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frame={level="2",args=[
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{name="intarg",value="2"},
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{name="strarg",value="0x11940 \"A string argument.\""}]},
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{frame={level="3",args=[
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{name="intarg",value="2"},
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{name="strarg",value="0x11940 \"A string argument.\""},
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{name="fltarg",value="3.5"}]},
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frame={level="4",args=[]}]
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(gdb)
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-stack-list-arguments 0 2 2
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^done,stack-args=[frame={level="2",args=[name="intarg",name="strarg"]}]
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(gdb)
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-stack-list-arguments 1 2 2
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^done,stack-args=[frame={level="2",
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args=[{name="intarg",value="2"},
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{name="strarg",value="0x11940 \"A string argument.\""}]}]
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(gdb)
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</pre>
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<!-- @subheading -stack-list-exception-handlers -->
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<p><a name="g_t_002dstack_002dlist_002dframes"></a>
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<h4 class="subheading">The <code>-stack-list-frames</code> Command</h4>
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<p><a name="index-g_t_002dstack_002dlist_002dframes-3023"></a>
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<h5 class="subsubheading">Synopsis</h5>
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<pre class="smallexample"> -stack-list-frames [ --no-frame-filters <var>low-frame</var> <var>high-frame</var> ]
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</pre>
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<p>List the frames currently on the stack. For each frame it displays the
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following info:
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<dl>
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<dt>‘<samp><var>level</var></samp>’<dd>The frame number, 0 being the topmost frame, i.e., the innermost function.
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<br><dt>‘<samp><var>addr</var></samp>’<dd>The <code>$pc</code> value for that frame.
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<br><dt>‘<samp><var>func</var></samp>’<dd>Function name.
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<br><dt>‘<samp><var>file</var></samp>’<dd>File name of the source file where the function lives.
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<br><dt>‘<samp><var>fullname</var></samp>’<dd>The full file name of the source file where the function lives.
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<br><dt>‘<samp><var>line</var></samp>’<dd>Line number corresponding to the <code>$pc</code>.
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<br><dt>‘<samp><var>from</var></samp>’<dd>The shared library where this function is defined. This is only given
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if the frame's function is not known.
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<br><dt>‘<samp><var>arch</var></samp>’<dd>Frame's architecture.
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</dl>
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<p>If invoked without arguments, this command prints a backtrace for the
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whole stack. If given two integer arguments, it shows the frames whose
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levels are between the two arguments (inclusive). If the two arguments
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are equal, it shows the single frame at the corresponding level. It is
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an error if <var>low-frame</var> is larger than the actual number of
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frames. On the other hand, <var>high-frame</var> may be larger than the
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actual number of frames, in which case only existing frames will be
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returned. If the option <code>--no-frame-filters</code> is supplied, then
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Python frame filters will not be executed.
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<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
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<p>The corresponding <span class="sc">gdb</span> commands are ‘<samp><span class="samp">backtrace</span></samp>’ and ‘<samp><span class="samp">where</span></samp>’.
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<h5 class="subsubheading">Example</h5>
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<p>Full stack backtrace:
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<pre class="smallexample"> (gdb)
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-stack-list-frames
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^done,stack=
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[frame={level="0",addr="0x0001076c",func="foo",
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file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="11",
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arch="i386:x86_64"},
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frame={level="1",addr="0x000107a4",func="foo",
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file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
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arch="i386:x86_64"},
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frame={level="2",addr="0x000107a4",func="foo",
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file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
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arch="i386:x86_64"},
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frame={level="3",addr="0x000107a4",func="foo",
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file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
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arch="i386:x86_64"},
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frame={level="4",addr="0x000107a4",func="foo",
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file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
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arch="i386:x86_64"},
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frame={level="5",addr="0x000107a4",func="foo",
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file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
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arch="i386:x86_64"},
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frame={level="6",addr="0x000107a4",func="foo",
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file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
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arch="i386:x86_64"},
|
||
|
|
frame={level="7",addr="0x000107a4",func="foo",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
|
||
|
|
arch="i386:x86_64"},
|
||
|
|
frame={level="8",addr="0x000107a4",func="foo",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
|
||
|
|
arch="i386:x86_64"},
|
||
|
|
frame={level="9",addr="0x000107a4",func="foo",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
|
||
|
|
arch="i386:x86_64"},
|
||
|
|
frame={level="10",addr="0x000107a4",func="foo",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
|
||
|
|
arch="i386:x86_64"},
|
||
|
|
frame={level="11",addr="0x00010738",func="main",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="4",
|
||
|
|
arch="i386:x86_64"}]
|
||
|
|
(gdb)
|
||
|
|
</pre>
|
||
|
|
<p>Show frames between <var>low_frame</var> and <var>high_frame</var>:
|
||
|
|
|
||
|
|
<pre class="smallexample"> (gdb)
|
||
|
|
-stack-list-frames 3 5
|
||
|
|
^done,stack=
|
||
|
|
[frame={level="3",addr="0x000107a4",func="foo",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
|
||
|
|
arch="i386:x86_64"},
|
||
|
|
frame={level="4",addr="0x000107a4",func="foo",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
|
||
|
|
arch="i386:x86_64"},
|
||
|
|
frame={level="5",addr="0x000107a4",func="foo",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
|
||
|
|
arch="i386:x86_64"}]
|
||
|
|
(gdb)
|
||
|
|
</pre>
|
||
|
|
<p>Show a single frame:
|
||
|
|
|
||
|
|
<pre class="smallexample"> (gdb)
|
||
|
|
-stack-list-frames 3 3
|
||
|
|
^done,stack=
|
||
|
|
[frame={level="3",addr="0x000107a4",func="foo",
|
||
|
|
file="recursive2.c",fullname="/home/foo/bar/recursive2.c",line="14",
|
||
|
|
arch="i386:x86_64"}]
|
||
|
|
(gdb)
|
||
|
|
</pre>
|
||
|
|
<h4 class="subheading">The <code>-stack-list-locals</code> Command</h4>
|
||
|
|
|
||
|
|
<p><a name="index-g_t_002dstack_002dlist_002dlocals-3024"></a><a name="g_t_002dstack_002dlist_002dlocals"></a>
|
||
|
|
|
||
|
|
<h5 class="subsubheading">Synopsis</h5>
|
||
|
|
|
||
|
|
<pre class="smallexample"> -stack-list-locals [ --no-frame-filters ] [ --skip-unavailable ] <var>print-values</var>
|
||
|
|
</pre>
|
||
|
|
<p>Display the local variable names for the selected frame. If
|
||
|
|
<var>print-values</var> is 0 or <code>--no-values</code>, print only the names of
|
||
|
|
the variables; if it is 1 or <code>--all-values</code>, print also their
|
||
|
|
values; and if it is 2 or <code>--simple-values</code>, print the name,
|
||
|
|
type and value for simple data types, and the name and type for arrays,
|
||
|
|
structures and unions. In this last case, a frontend can immediately
|
||
|
|
display the value of simple data types and create variable objects for
|
||
|
|
other data types when the user wishes to explore their values in
|
||
|
|
more detail. If the option <code>--no-frame-filters</code> is supplied, then
|
||
|
|
Python frame filters will not be executed.
|
||
|
|
|
||
|
|
<p>If the <code>--skip-unavailable</code> option is specified, local variables
|
||
|
|
that are not available are not listed. Partially available local
|
||
|
|
variables are still displayed, however.
|
||
|
|
|
||
|
|
<p>This command is deprecated in favor of the
|
||
|
|
‘<samp><span class="samp">-stack-list-variables</span></samp>’ command.
|
||
|
|
|
||
|
|
<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
|
||
|
|
|
||
|
|
<p>‘<samp><span class="samp">info locals</span></samp>’ in <span class="sc">gdb</span>, ‘<samp><span class="samp">gdb_get_locals</span></samp>’ in <code>gdbtk</code>.
|
||
|
|
|
||
|
|
<h5 class="subsubheading">Example</h5>
|
||
|
|
|
||
|
|
<pre class="smallexample"> (gdb)
|
||
|
|
-stack-list-locals 0
|
||
|
|
^done,locals=[name="A",name="B",name="C"]
|
||
|
|
(gdb)
|
||
|
|
-stack-list-locals --all-values
|
||
|
|
^done,locals=[{name="A",value="1"},{name="B",value="2"},
|
||
|
|
{name="C",value="{1, 2, 3}"}]
|
||
|
|
-stack-list-locals --simple-values
|
||
|
|
^done,locals=[{name="A",type="int",value="1"},
|
||
|
|
{name="B",type="int",value="2"},{name="C",type="int [3]"}]
|
||
|
|
(gdb)
|
||
|
|
</pre>
|
||
|
|
<p><a name="g_t_002dstack_002dlist_002dvariables"></a>
|
||
|
|
|
||
|
|
<h4 class="subheading">The <code>-stack-list-variables</code> Command</h4>
|
||
|
|
|
||
|
|
<p><a name="index-g_t_002dstack_002dlist_002dvariables-3025"></a>
|
||
|
|
|
||
|
|
<h5 class="subsubheading">Synopsis</h5>
|
||
|
|
|
||
|
|
<pre class="smallexample"> -stack-list-variables [ --no-frame-filters ] [ --skip-unavailable ] <var>print-values</var>
|
||
|
|
</pre>
|
||
|
|
<p>Display the names of local variables and function arguments for the selected frame. If
|
||
|
|
<var>print-values</var> is 0 or <code>--no-values</code>, print only the names of
|
||
|
|
the variables; if it is 1 or <code>--all-values</code>, print also their
|
||
|
|
values; and if it is 2 or <code>--simple-values</code>, print the name,
|
||
|
|
type and value for simple data types, and the name and type for arrays,
|
||
|
|
structures and unions. If the option <code>--no-frame-filters</code> is
|
||
|
|
supplied, then Python frame filters will not be executed.
|
||
|
|
|
||
|
|
<p>If the <code>--skip-unavailable</code> option is specified, local variables
|
||
|
|
and arguments that are not available are not listed. Partially
|
||
|
|
available arguments and local variables are still displayed, however.
|
||
|
|
|
||
|
|
<h5 class="subsubheading">Example</h5>
|
||
|
|
|
||
|
|
<pre class="smallexample"> (gdb)
|
||
|
|
-stack-list-variables --thread 1 --frame 0 --all-values
|
||
|
|
^done,variables=[{name="x",value="11"},{name="s",value="{a = 1, b = 2}"}]
|
||
|
|
(gdb)
|
||
|
|
</pre>
|
||
|
|
<h4 class="subheading">The <code>-stack-select-frame</code> Command</h4>
|
||
|
|
|
||
|
|
<p><a name="index-g_t_002dstack_002dselect_002dframe-3026"></a>
|
||
|
|
|
||
|
|
<h5 class="subsubheading">Synopsis</h5>
|
||
|
|
|
||
|
|
<pre class="smallexample"> -stack-select-frame <var>framenum</var>
|
||
|
|
</pre>
|
||
|
|
<p>Change the selected frame. Select a different frame <var>framenum</var> on
|
||
|
|
the stack.
|
||
|
|
|
||
|
|
<p>This command in deprecated in favor of passing the ‘<samp><span class="samp">--frame</span></samp>’
|
||
|
|
option to every command.
|
||
|
|
|
||
|
|
<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
|
||
|
|
|
||
|
|
<p>The corresponding <span class="sc">gdb</span> commands are ‘<samp><span class="samp">frame</span></samp>’, ‘<samp><span class="samp">up</span></samp>’,
|
||
|
|
‘<samp><span class="samp">down</span></samp>’, ‘<samp><span class="samp">select-frame</span></samp>’, ‘<samp><span class="samp">up-silent</span></samp>’, and ‘<samp><span class="samp">down-silent</span></samp>’.
|
||
|
|
|
||
|
|
<h5 class="subsubheading">Example</h5>
|
||
|
|
|
||
|
|
<pre class="smallexample"> (gdb)
|
||
|
|
-stack-select-frame 2
|
||
|
|
^done
|
||
|
|
(gdb)
|
||
|
|
</pre>
|
||
|
|
<!-- %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -->
|
||
|
|
</body></html>
|
||
|
|
|