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Add documentation for ImmutablePass's

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3926 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2002-09-25 22:31:38 +00:00
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docs/WritingAnLLVMPass.html
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@ -19,6 +19,7 @@
</ul>
<li><a href="#passtype">Pass classes and requirements</a>
<ul>
<li><a href="#ImmutablePass">The <tt>ImmutablePass</tt> class</a>
<li><a href="#Pass">The <tt>Pass</tt> class</a>
<ul>
<li><a href="#run">The <tt>run</tt> method</a>
@ -365,6 +366,27 @@ optimize how passes are run, so that the resultant compiler isn't unneccesarily
slow.<p>
<!-- ======================================================================= -->
</ul><table width="100%" bgcolor="#441188" border=0 cellpadding=4 cellspacing=0>
<tr><td>&nbsp;</td><td width="100%">&nbsp;
<font color="#EEEEFF" face="Georgia,Palatino"><b>
<a name="ImmutablePass">The <tt>ImmutablePass</tt> class
</b></font></td></tr></table><ul>
The most plain and boring type of pass is the "<tt><a
href="http://llvm.cs.uiuc.edu/doxygen/structImmutablePass.html">ImmutablePass</a></tt>"
class. This pass type is used for passes that do not have to be run, do not
change state, and never need to be updated. This is not a normal type of
transformation or analysis, but can provide information about the current
compiler configuration.<p>
Although this pass class is very infrequently used, it is important for
providing information about the current target machine being compiled for, and
other static information that can affect the various transformations.<p>
<tt>ImmutablePass</tt>'s never invalidate other transformations, are never
invalidated, and are never "run".<p>
<!-- ======================================================================= -->
</ul><table width="100%" bgcolor="#441188" border=0 cellpadding=4 cellspacing=0>
@ -1201,6 +1223,6 @@ href="#Pass"><tt>Pass</tt></a>, only the other way around.<p>
<address><a href="mailto:sabre@nondot.org">Chris Lattner</a></address>
<!-- Created: Tue Aug 6 15:00:33 CDT 2002 -->
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Last modified: Mon Sep 16 17:37:27 CDT 2002
Last modified: Wed Sep 25 17:20:10 CDT 2002
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</font></body></html>