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Document a more robust implementation of performCustomLowering.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45326 91177308-0d34-0410-b5e6-96231b3b80d8
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Gordon Henriksen 2007-12-22 23:32:32 +00:00
parent 52ec375438
commit 0adede059e
1 changed files with 14 additions and 16 deletions
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docs/GarbageCollection.html
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@ -1084,37 +1084,35 @@ href="WritingAnLLVMPass.html#doInitialization_mod"><tt>doInitialization(Module
<blockquote><pre
>#include "llvm/Module.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
bool MyCollector::initializeCustomLowering(Module &amp;M) {
return false;
}
bool MyCollector::performCustomLowering(Function &amp;F) {
const Module *M = F.getParent();
Function *GCReadInt = M-&gt;getFunction("llvm.gcread"),
*GCWriteInt = M-&gt;getFunction("llvm.gcwrite"),
*GCRootInt = M-&gt;getFunction("llvm.gcroot");
bool MadeChange = false;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
for (BasicBlock::iterator II = BB->begin(), E = BB->end(); II != E;)
if (CallInst *CI = dyn_cast&lt;CallInst&gt;(II++))
if (Function *F = CI->getCalledFunction())
if (F == GCWriteInt) {
for (BasicBlock::iterator II = BB-&gt;begin(), E = BB-&gt;end(); II != E; ++II)
if (IntrinsicInst *CI = dyn_cast&lt;IntrinsicInst&gt;(II))
if (Function *F = CI-&gt;getCalledFunction())
switch (F-&gt;getIntrinsicID()) {
case Intrinsic::gcwrite:
// Handle llvm.gcwrite.
CI->eraseFromParent();
CI-&gt;eraseFromParent();
MadeChange = true;
} else if (F == GCReadInt) {
break;
case Intrinsic::gcread:
// Handle llvm.gcread.
CI->eraseFromParent();
CI-&gt;eraseFromParent();
MadeChange = true;
} else if (F == GCRootInt) {
break;
case Intrinsic::gcroot:
// Handle llvm.gcroot.
CI->eraseFromParent();
CI-&gt;eraseFromParent();
MadeChange = true;
break;
}
return MadeChange;