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125 lines
4.7 KiB
HTML
125 lines
4.7 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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<!-- This file documents the gprof profiler of the GNU system.
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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
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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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>Debugging (GNU gprof)</title>
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<meta name="description" content="Debugging (GNU gprof)">
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<meta name="keywords" content="Debugging (GNU gprof)">
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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="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Details.html#Details" rel="up" title="Details">
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<link href="GNU-Free-Documentation-License.html#GNU-Free-Documentation-License" rel="next" title="GNU Free Documentation License">
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<link href="Internals.html#Internals" rel="prev" title="Internals">
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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="Debugging"></a>
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<div class="header">
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<p>
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Previous: <a href="Internals.html#Internals" accesskey="p" rel="prev">Internals</a>, Up: <a href="Details.html#Details" accesskey="u" rel="up">Details</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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<hr>
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<a name="Debugging-gprof"></a>
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<h3 class="section">9.4 Debugging <code>gprof</code></h3>
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<p>If <code>gprof</code> was compiled with debugging enabled,
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the ‘<samp>-d</samp>’ option triggers debugging output
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(to stdout) which can be helpful in understanding its operation.
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The debugging number specified is interpreted as a sum of the following
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options:
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</p>
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<dl compact="compact">
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<dt>2 - Topological sort</dt>
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<dd><p>Monitor depth-first numbering of symbols during call graph analysis
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</p></dd>
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<dt>4 - Cycles</dt>
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<dd><p>Shows symbols as they are identified as cycle heads
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</p></dd>
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<dt>16 - Tallying</dt>
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<dd><p>As the call graph arcs are read, show each arc and how
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the total calls to each function are tallied
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</p></dd>
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<dt>32 - Call graph arc sorting</dt>
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<dd><p>Details sorting individual parents/children within each call graph entry
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</p></dd>
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<dt>64 - Reading histogram and call graph records</dt>
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<dd><p>Shows address ranges of histograms as they are read, and each
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call graph arc
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</p></dd>
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<dt>128 - Symbol table</dt>
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<dd><p>Reading, classifying, and sorting the symbol table from the object file.
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For line-by-line profiling (‘<samp>-l</samp>’ option), also shows line numbers
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being assigned to memory addresses.
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</p></dd>
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<dt>256 - Static call graph</dt>
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<dd><p>Trace operation of ‘<samp>-c</samp>’ option
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</p></dd>
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<dt>512 - Symbol table and arc table lookups</dt>
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<dd><p>Detail operation of lookup routines
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</p></dd>
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<dt>1024 - Call graph propagation</dt>
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<dd><p>Shows how function times are propagated along the call graph
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</p></dd>
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<dt>2048 - Basic-blocks</dt>
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<dd><p>Shows basic-block records as they are read from profile data
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(only meaningful with ‘<samp>-l</samp>’ option)
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</p></dd>
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<dt>4096 - Symspecs</dt>
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<dd><p>Shows symspec-to-symbol pattern matching operation
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</p></dd>
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<dt>8192 - Annotate source</dt>
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<dd><p>Tracks operation of ‘<samp>-A</samp>’ option
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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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