88 lines
4.2 KiB
HTML
88 lines
4.2 KiB
HTML
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<html lang="en">
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<head>
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<title>Stack - Debugging with GDB</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Debugging with GDB">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="prev" href="Process-Record-and-Replay.html#Process-Record-and-Replay" title="Process Record and Replay">
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<link rel="next" href="Source.html#Source" title="Source">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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Copyright (C) 1988-2019 Free Software Foundation, Inc.
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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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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: ``You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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</head>
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<body>
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<div class="node">
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<a name="Stack"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Source.html#Source">Source</a>,
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Previous: <a rel="previous" accesskey="p" href="Process-Record-and-Replay.html#Process-Record-and-Replay">Process Record and Replay</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<hr>
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</div>
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<h2 class="chapter">8 Examining the Stack</h2>
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<p>When your program has stopped, the first thing you need to know is where it
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stopped and how it got there.
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<p><a name="index-call-stack-502"></a>Each time your program performs a function call, information about the call
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is generated.
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That information includes the location of the call in your program,
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the arguments of the call,
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and the local variables of the function being called.
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The information is saved in a block of data called a <dfn>stack frame</dfn>.
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The stack frames are allocated in a region of memory called the <dfn>call
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stack</dfn>.
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<p>When your program stops, the <span class="sc">gdb</span> commands for examining the
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stack allow you to see all of this information.
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<p><a name="index-selected-frame-503"></a>One of the stack frames is <dfn>selected</dfn> by <span class="sc">gdb</span> and many
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<span class="sc">gdb</span> commands refer implicitly to the selected frame. In
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particular, whenever you ask <span class="sc">gdb</span> for the value of a variable in
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your program, the value is found in the selected frame. There are
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special <span class="sc">gdb</span> commands to select whichever frame you are
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interested in. See <a href="Selection.html#Selection">Selecting a Frame</a>.
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<p>When your program stops, <span class="sc">gdb</span> automatically selects the
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currently executing frame and describes it briefly, similar to the
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<code>frame</code> command (see <a href="Frame-Info.html#Frame-Info">Information about a Frame</a>).
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<ul class="menu">
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<li><a accesskey="1" href="Frames.html#Frames">Frames</a>: Stack frames
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<li><a accesskey="2" href="Backtrace.html#Backtrace">Backtrace</a>: Backtraces
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<li><a accesskey="3" href="Selection.html#Selection">Selection</a>: Selecting a frame
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<li><a accesskey="4" href="Frame-Info.html#Frame-Info">Frame Info</a>: Information on a frame
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<li><a accesskey="5" href="Frame-Apply.html#Frame-Apply">Frame Apply</a>: Applying a command to several frames
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<li><a accesskey="6" href="Frame-Filter-Management.html#Frame-Filter-Management">Frame Filter Management</a>: Managing frame filters
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</ul>
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</body></html>
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