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Implement function prefix data as an IR feature.

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Previous discussion:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-July/063909.html

Differential Revision: http://llvm-reviews.chandlerc.com/D1191

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190773 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2013-09-16 01:08:15 +00:00
parent fabfb5d588
commit 1e3037f0be
20 changed files with 213 additions and 13 deletions
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36
lib/IR/Function.cpp
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@@ -276,6 +276,9 @@ void Function::dropAllReferences() {
// blockaddresses, but BasicBlock's destructor takes care of those.
while (!BasicBlocks.empty())
BasicBlocks.begin()->eraseFromParent();
// Prefix data is stored in a side table.
setPrefixData(0);
}
void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
@@ -351,6 +354,10 @@ void Function::copyAttributesFrom(const GlobalValue *Src) {
setGC(SrcF->getGC());
else
clearGC();
if (SrcF->hasPrefixData())
setPrefixData(SrcF->getPrefixData());
else
setPrefixData(0);
}
/// getIntrinsicID - This method returns the ID number of the specified
@@ -720,3 +727,32 @@ bool Function::callsFunctionThatReturnsTwice() const {
return false;
}
Constant *Function::getPrefixData() const {
assert(hasPrefixData());
const LLVMContextImpl::PrefixDataMapTy &PDMap =
getContext().pImpl->PrefixDataMap;
assert(PDMap.find(this) != PDMap.end());
return cast<Constant>(PDMap.find(this)->second->getReturnValue());
}
void Function::setPrefixData(Constant *PrefixData) {
if (!PrefixData && !hasPrefixData())
return;
unsigned SCData = getSubclassDataFromValue();
LLVMContextImpl::PrefixDataMapTy &PDMap = getContext().pImpl->PrefixDataMap;
ReturnInst *&PDHolder = PDMap[this];
if (PrefixData) {
if (PDHolder)
PDHolder->setOperand(0, PrefixData);
else
PDHolder = ReturnInst::Create(getContext(), PrefixData);
SCData |= 2;
} else {
delete PDHolder;
PDMap.erase(this);
SCData &= ~2;
}
setValueSubclassData(SCData);
}