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127 lines
6.4 KiB
HTML
127 lines
6.4 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Stack (Debugging with GDB)</title>
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<meta name="description" content="Stack (Debugging with GDB)">
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<meta name="keywords" content="Stack (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="Frames.html#Frames" rel="next" title="Frames">
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<link href="Process-Record-and-Replay.html#Process-Record-and-Replay" rel="prev" title="Process Record and Replay">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Stack"></a>
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<div class="header">
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<p>
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Next: <a href="Source.html#Source" accesskey="n" rel="next">Source</a>, Previous: <a href="Process-Record-and-Replay.html#Process-Record-and-Replay" accesskey="p" rel="prev">Process Record and Replay</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<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>
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</div>
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<hr>
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<a name="Examining-the-Stack"></a>
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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>
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<a name="index-call-stack"></a>
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<p>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 <em>stack frame</em>.
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The stack frames are allocated in a region of memory called the <em>call
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stack</em>.
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</p>
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<p>When your program stops, the <small>GDB</small> commands for examining the
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stack allow you to see all of this information.
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</p>
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<a name="index-selected-frame"></a>
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<p>One of the stack frames is <em>selected</em> by <small>GDB</small> and many
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<small>GDB</small> commands refer implicitly to the selected frame. In
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particular, whenever you ask <small>GDB</small> 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 <small>GDB</small> 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>
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<p>When your program stops, <small>GDB</small> 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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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Frames.html#Frames" accesskey="1">Frames</a>:</td><td> </td><td align="left" valign="top">Stack frames
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Backtrace.html#Backtrace" accesskey="2">Backtrace</a>:</td><td> </td><td align="left" valign="top">Backtraces
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Selection.html#Selection" accesskey="3">Selection</a>:</td><td> </td><td align="left" valign="top">Selecting a frame
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Frame-Info.html#Frame-Info" accesskey="4">Frame Info</a>:</td><td> </td><td align="left" valign="top">Information on a frame
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Frame-Apply.html#Frame-Apply" accesskey="5">Frame Apply</a>:</td><td> </td><td align="left" valign="top">Applying a command to several frames
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Frame-Filter-Management.html#Frame-Filter-Management" accesskey="6">Frame Filter Management</a>:</td><td> </td><td align="left" valign="top">Managing frame filters
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</td></tr>
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<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
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</pre></th></tr></table>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Source.html#Source" accesskey="n" rel="next">Source</a>, Previous: <a href="Process-Record-and-Replay.html#Process-Record-and-Replay" accesskey="p" rel="prev">Process Record and Replay</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<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>
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</div>
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</body>
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</html>
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