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<title>Symspecs - GNU gprof</title>
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<a name="Symspecs"></a>Previous: <a rel="previous" accesskey="p" href="Deprecated-Options.html#Deprecated-Options">Deprecated Options</a>,
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Up: <a rel="up" accesskey="u" href="Invoking.html#Invoking">Invoking</a>
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<hr><br>
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<h3 class="section">4.5 Symspecs</h3>
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<p>Many of the output options allow functions to be included or excluded
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using <dfn>symspecs</dfn> (symbol specifications), which observe the
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following syntax:
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<pre class="example"> filename_containing_a_dot
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| funcname_not_containing_a_dot
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| linenumber
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| ( [ any_filename ] `:' ( any_funcname | linenumber ) )
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</pre>
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<p>Here are some sample symspecs:
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<dl>
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<dt><span class="samp">main.c</span><dd>Selects everything in file <span class="file">main.c</span>—the
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dot in the string tells <code>gprof</code> to interpret
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the string as a filename, rather than as
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a function name. To select a file whose
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name does not contain a dot, a trailing colon
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should be specified. For example, <span class="samp">odd:</span> is
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interpreted as the file named <span class="file">odd</span>.
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<br><dt><span class="samp">main</span><dd>Selects all functions named <span class="samp">main</span>.
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<p>Note that there may be multiple instances of the same function name
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because some of the definitions may be local (i.e., static). Unless a
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function name is unique in a program, you must use the colon notation
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explained below to specify a function from a specific source file.
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<p>Sometimes, function names contain dots. In such cases, it is necessary
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to add a leading colon to the name. For example, <span class="samp">:.mul</span> selects
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function <span class="samp">.mul</span>.
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<p>In some object file formats, symbols have a leading underscore.
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<code>gprof</code> will normally not print these underscores. When you name a
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symbol in a symspec, you should type it exactly as <code>gprof</code> prints
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it in its output. For example, if the compiler produces a symbol
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<span class="samp">_main</span> from your <code>main</code> function, <code>gprof</code> still prints
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it as <span class="samp">main</span> in its output, so you should use <span class="samp">main</span> in
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symspecs.
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<br><dt><span class="samp">main.c:main</span><dd>Selects function <span class="samp">main</span> in file <span class="file">main.c</span>.
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<br><dt><span class="samp">main.c:134</span><dd>Selects line 134 in file <span class="file">main.c</span>.
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</dl>
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