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157 lines
7.8 KiB
HTML
157 lines
7.8 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>Explicit Locations (Debugging with GDB)</title>
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<meta name="description" content="Explicit Locations (Debugging with GDB)">
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<meta name="keywords" content="Explicit Locations (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="Specify-Location.html#Specify-Location" rel="up" title="Specify Location">
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<link href="Address-Locations.html#Address-Locations" rel="next" title="Address Locations">
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<link href="Linespec-Locations.html#Linespec-Locations" rel="prev" title="Linespec Locations">
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<style type="text/css">
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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="Explicit-Locations"></a>
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<div class="header">
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<p>
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Next: <a href="Address-Locations.html#Address-Locations" accesskey="n" rel="next">Address Locations</a>, Previous: <a href="Linespec-Locations.html#Linespec-Locations" accesskey="p" rel="prev">Linespec Locations</a>, Up: <a href="Specify-Location.html#Specify-Location" accesskey="u" rel="up">Specify Location</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="Explicit-Locations-1"></a>
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<h4 class="subsection">9.2.2 Explicit Locations</h4>
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<a name="index-explicit-locations"></a>
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<p><em>Explicit locations</em> allow the user to directly specify the source
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location’s parameters using option-value pairs.
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</p>
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<p>Explicit locations are useful when several functions, labels, or
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file names have the same name (base name for files) in the program’s
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sources. In these cases, explicit locations point to the source
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line you meant more accurately and unambiguously. Also, using
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explicit locations might be faster in large programs.
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</p>
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<p>For example, the linespec ‘<samp>foo:bar</samp>’ may refer to a function <code>bar</code>
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defined in the file named <samp>foo</samp> or the label <code>bar</code> in a function
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named <code>foo</code>. <small>GDB</small> must search either the file system or
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the symbol table to know.
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</p>
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<p>The list of valid explicit location options is summarized in the
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following table:
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</p>
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<dl compact="compact">
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<dt><code>-source <var>filename</var></code></dt>
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<dd><p>The value specifies the source file name. To differentiate between
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files with the same base name, prepend as many directories as is necessary
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to uniquely identify the desired file, e.g., <samp>foo/bar/baz.c</samp>. Otherwise
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<small>GDB</small> will use the first file it finds with the given base
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name. This option requires the use of either <code>-function</code> or <code>-line</code>.
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</p>
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</dd>
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<dt><code>-function <var>function</var></code></dt>
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<dd><p>The value specifies the name of a function. Operations
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on function locations unmodified by other options (such as <code>-label</code>
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or <code>-line</code>) refer to the line that begins the body of the function.
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In C, for example, this is the line with the open brace.
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</p>
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<p>By default, in C<tt>++</tt> and Ada, <var>function</var> is interpreted as
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specifying all functions named <var>function</var> in all scopes. For
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C<tt>++</tt>, this means in all namespaces and classes. For Ada, this
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means in all packages.
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</p>
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<p>For example, assuming a program with C<tt>++</tt> symbols named
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<code>A::B::func</code> and <code>B::func</code>, both commands <kbd>break <span class="nolinebreak">-function</span> func</kbd><!-- /@w --> and <kbd>break <span class="nolinebreak">-function</span> B::func</kbd><!-- /@w --> set a
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breakpoint on both symbols.
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</p>
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<p>You can use the <kbd>-qualified</kbd> flag to override this (see below).
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</p>
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</dd>
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<dt><code>-qualified</code></dt>
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<dd>
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<p>This flag makes <small>GDB</small> interpret a function name specified with
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<kbd>-function</kbd> as a complete fully-qualified name.
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</p>
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<p>For example, assuming a C<tt>++</tt> program with symbols named
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<code>A::B::func</code> and <code>B::func</code>, the <kbd>break <span class="nolinebreak">-qualified</span> <span class="nolinebreak">-function</span> B::func</kbd><!-- /@w --> command sets a breakpoint on <code>B::func</code>, only.
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</p>
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<p>(Note: the <kbd>-qualified</kbd> option can precede a linespec as well
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(see <a href="Linespec-Locations.html#Linespec-Locations">Linespec Locations</a>), so the particular example above could be
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simplified as <kbd>break <span class="nolinebreak">-qualified</span> B::func</kbd><!-- /@w -->.)
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</p>
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</dd>
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<dt><code>-label <var>label</var></code></dt>
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<dd><p>The value specifies the name of a label. When the function
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name is not specified, the label is searched in the function of the currently
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selected stack frame.
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</p>
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</dd>
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<dt><code>-line <var>number</var></code></dt>
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<dd><p>The value specifies a line offset for the location. The offset may either
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be absolute (<code>-line 3</code>) or relative (<code>-line +3</code>), depending on
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the command. When specified without any other options, the line offset is
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relative to the current line.
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</p></dd>
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</dl>
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<p>Explicit location options may be abbreviated by omitting any non-unique
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trailing characters from the option name, e.g., <kbd>break <span class="nolinebreak">-s</span> main.c <span class="nolinebreak">-li</span> 3</kbd><!-- /@w -->.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Address-Locations.html#Address-Locations" accesskey="n" rel="next">Address Locations</a>, Previous: <a href="Linespec-Locations.html#Linespec-Locations" accesskey="p" rel="prev">Linespec Locations</a>, Up: <a href="Specify-Location.html#Specify-Location" accesskey="u" rel="up">Specify Location</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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