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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3635 91177308-0d34-0410-b5e6-96231b3b80d8
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Joel Stanley 2002-09-09 16:29:58 +00:00
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commit d8aabb20e8
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docs/ProgrammersManual.html
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@ -383,11 +383,11 @@ more complex example </h4><ul>
Say that you're writing a FunctionPass and would like to count all the
locations in the entire module (that is, across every
<tt>Function</tt>) where a certain function (i.e. <tt>Function</tt>*)
passed into the FunctionPass constructor. As you'll learn later, you
may want to use an <tt>InstVisitor</tt> to accomplish this in a much
more straightforward manner, but this example will allow us to explore
how you'd do it if you didn't have <tt>InstVisitor</tt> around. In
<tt>Function</tt>) where a certain function (i.e. some
<tt>Function</tt>*) already in scope. As you'll learn later, you may
want to use an <tt>InstVisitor</tt> to accomplish this in a much more
straightforward manner, but this example will allow us to explore how
you'd do it if you didn't have <tt>InstVisitor</tt> around. In
pseudocode, this is what we want to do:
<pre>
@ -400,15 +400,16 @@ for each Function f in the Module
</pre>
And the actual code is (remember, since we're writing a
<tt>FunctionPass</tt> our <tt>FunctionPass</tt>-derived class simply
<tt>FunctionPass</tt>, our <tt>FunctionPass</tt>-derived class simply
has to override the <tt>runOnFunction</tt> method...):
<pre>
Function* targetFunc = ...;
class OurFunctionPass : public FunctionPass {
public:
OurFunctionPass(Function* func): m_func(func) { }
virtual doInitialization(Module&amp M) { callCounter = 0; };
OurFunctionPass(): callCounter(0) { }
virtual runOnFunction(Function&amp F) {
for(Function::iterator b = F.begin(), be = F.end(); b != be; ++b) {
@ -418,15 +419,14 @@ class OurFunctionPass : public FunctionPass {
// need to determine if it's a call to the
// function pointed to by m_func or not.
if(callInst-&gt;getCalledFunction() == m_func)
if(callInst-&gt;getCalledFunction() == targetFunc)
++callCounter;
}
}
}
private:
Function* m_func; // we're counting calls to this function.
static unsigned callCounter;
unsigned callCounter;
};
</pre>
@ -1280,6 +1280,6 @@ pointer to the parent Function.
<a href="mailto:sabre@nondot.org">Chris Lattner</a></address>
<!-- Created: Tue Aug 6 15:00:33 CDT 2002 -->
<!-- hhmts start -->
Last modified: Mon Sep 9 10:47:48 CDT 2002
Last modified: Mon Sep 9 11:29:35 CDT 2002
<!-- hhmts end -->
</font></body></html>