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78 lines
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<title>Dump setup - GNU Compiler Collection (GCC) Internals</title>
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<a name="Dump-setup"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Optimization-groups.html#Optimization-groups">Optimization groups</a>,
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Up: <a rel="up" accesskey="u" href="Optimization-info.html#Optimization-info">Optimization info</a>
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<h4 class="subsection">9.7.1 Dump setup</h4>
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<p><a name="index-dump-setup-1696"></a>
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A dump_manager class is defined in <samp><span class="file">dumpfile.h</span></samp>. Various passes
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register dumping pass-specific information via <code>dump_register</code> in
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<samp><span class="file">passes.c</span></samp>. During the registration, an optimization pass can
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select its optimization group (see <a href="Optimization-groups.html#Optimization-groups">Optimization groups</a>). After
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that optimization information corresponding to the entire group
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(presumably from multiple passes) can be output via command-line
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switches. Note that if a pass does not fit into any of the pre-defined
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groups, it can select <code>OPTGROUP_NONE</code>.
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<p>Note that in general, a pass need not know its dump output file name,
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whether certain flags are enabled, etc. However, for legacy reasons,
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passes could also call <code>dump_begin</code> which returns a stream in
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case the particular pass has optimization dumps enabled. A pass could
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call <code>dump_end</code> when the dump has ended. These methods should go
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away once all the passes are converted to use the new dump
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infrastructure.
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<p>The recommended way to setup the dump output is via <code>dump_start</code>
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and <code>dump_end</code>.
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