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119 lines
5.2 KiB
HTML
119 lines
5.2 KiB
HTML
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<head>
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<title>Address Locations (Debugging with GDB)</title>
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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="Edit.html#Edit" rel="next" title="Edit">
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<a name="Address-Locations"></a>
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<div class="header">
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<p>
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Previous: <a href="Explicit-Locations.html#Explicit-Locations" accesskey="p" rel="prev">Explicit 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="Address-Locations-1"></a>
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<h4 class="subsection">9.2.3 Address Locations</h4>
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<a name="index-address-locations"></a>
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<p><em>Address locations</em> indicate a specific program address. They have
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the generalized form *<var>address</var>.
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</p>
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<p>For line-oriented commands, such as <code>list</code> and <code>edit</code>, this
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specifies a source line that contains <var>address</var>. For <code>break</code> and
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other breakpoint-oriented commands, this can be used to set breakpoints in
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parts of your program which do not have debugging information or
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source files.
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</p>
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<p>Here <var>address</var> may be any expression valid in the current working
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language (see <a href="Languages.html#Languages">working language</a>) that specifies a code
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address. In addition, as a convenience, <small>GDB</small> extends the
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semantics of expressions used in locations to cover several situations
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that frequently occur during debugging. Here are the various forms
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of <var>address</var>:
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</p>
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<dl compact="compact">
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<dt><code><var>expression</var></code></dt>
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<dd><p>Any expression valid in the current working language.
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</p>
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</dd>
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<dt><code><var>funcaddr</var></code></dt>
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<dd><p>An address of a function or procedure derived from its name. In C,
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C<tt>++</tt>, Objective-C, Fortran, minimal, and assembly, this is
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simply the function’s name <var>function</var> (and actually a special case
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of a valid expression). In Pascal and Modula-2, this is
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<code>&<var>function</var></code>. In Ada, this is <code><var>function</var>'Address</code>
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(although the Pascal form also works).
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</p>
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<p>This form specifies the address of the function’s first instruction,
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before the stack frame and arguments have been set up.
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</p>
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</dd>
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<dt><code>'<var>filename</var>':<var>funcaddr</var></code></dt>
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<dd><p>Like <var>funcaddr</var> above, but also specifies the name of the source
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file explicitly. This is useful if the name of the function does not
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specify the function unambiguously, e.g., if there are several
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functions with identical names in different source files.
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</p></dd>
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</dl>
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</body>
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</html>
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