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Added bits about MachineFunctionPass

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7192 91177308-0d34-0410-b5e6-96231b3b80d8
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Brian Gaeke 2003-07-17 18:53:20 +00:00
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docs/WritingAnLLVMPass.html

@ -40,6 +40,8 @@
<li><a href="#doFinalization_fn">The <tt>doFinalization(Function
&amp;)</tt> method</a>
</ul>
<li><a href="#MachineFunctionPass">The <tt>MachineFunctionPass</tt>
class</a>
</ul>
<li><a href="#registration">Pass Registration</a>
<ul>
@ -569,6 +571,31 @@ program being compiled. This can be used to perform per-function
finalization.<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="MachineFunctionPass">The <tt>MachineFunctionPass</tt> class
</b></font></td></tr></table><ul>
A <tt>MachineFunctionPass</tt> executes on the machine-dependent
representation of each LLVM function in the program,
independent of all of the other functions in the program.
A <tt>MachineFunctionPass</tt> is also a <tt>FunctionPass</tt>, so all
the restrictions that apply to a <tt>FunctionPass</tt> also apply to it.
<tt>MachineFunctionPass</tt>es also have additional restrictions. In
particular, <tt>MachineFunctionPass</tt>es are not allowed to do any of
the following:
<ol>
<li>Modify any LLVM Instructions, BasicBlocks or Functions.
<li>Modify a MachineFunction other than the one currently being processed.
<li>Add or remove MachineFunctions from the current Module.
<li>Add or remove global variables from the current Module.
<li>Maintain state across invocations of
<a href="#runOnMachineFunction"><tt>runOnMachineFunction</tt></a> (including global data)
</ol><p>
<!-- *********************************************************************** -->
</ul><table width="100%" bgcolor="#330077" border=0 cellpadding=4 cellspacing=0>