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Add an unwind_to field to basic blocks, making them Users instead of Values.

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This is the first checkin for PR1269, the new EH infrastructure.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47802 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2008-03-02 02:48:09 +00:00
parent fe0753efba
commit fc82fabe00
10 changed files with 146 additions and 30 deletions
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23
lib/VMCore/BasicBlock.cpp
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@ -70,8 +70,8 @@ template class SymbolTableListTraits<Instruction, BasicBlock>;
BasicBlock::BasicBlock(const std::string &Name, Function *NewParent,
BasicBlock *InsertBefore)
: Value(Type::LabelTy, Value::BasicBlockVal), Parent(0) {
BasicBlock *InsertBefore, BasicBlock *Dest)
: User(Type::LabelTy, Value::BasicBlockVal, &unwindDest, 0), Parent(0) {
// Make sure that we get added to a function
LeakDetector::addGarbageObject(this);
@ -85,6 +85,8 @@ BasicBlock::BasicBlock(const std::string &Name, Function *NewParent,
}
setName(Name);
unwindDest.init(NULL, this);
setUnwindDest(Dest);
}
@ -113,6 +115,19 @@ void BasicBlock::eraseFromParent() {
getParent()->getBasicBlockList().erase(this);
}
const BasicBlock *BasicBlock::getUnwindDest() const {
return cast_or_null<const BasicBlock>(unwindDest.get());
}
BasicBlock *BasicBlock::getUnwindDest() {
return cast_or_null<BasicBlock>(unwindDest.get());
}
void BasicBlock::setUnwindDest(BasicBlock *dest) {
NumOperands = unwindDest ? 1 : 0;
unwindDest.set(dest);
}
/// moveBefore - Unlink this basic block from its current function and
/// insert it into the function that MovePos lives in, right before MovePos.
void BasicBlock::moveBefore(BasicBlock *MovePos) {
@ -151,6 +166,7 @@ Instruction* BasicBlock::getFirstNonPHI()
}
void BasicBlock::dropAllReferences() {
setUnwindDest(NULL);
for(iterator I = begin(), E = end(); I != E; ++I)
I->dropAllReferences();
}
@ -177,6 +193,9 @@ void BasicBlock::removePredecessor(BasicBlock *Pred,
find(pred_begin(this), pred_end(this), Pred) != pred_end(this)) &&
"removePredecessor: BB is not a predecessor!");
if (Pred == getUnwindDest())
setUnwindDest(NULL);
if (InstList.empty()) return;
PHINode *APN = dyn_cast<PHINode>(&front());
if (!APN) return; // Quick exit.