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If we are extracting a basic block that ends in an invoke call, we must also

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extract the landing pad block. Otherwise, there will be a situation where the
invoke's unwind edge lands on a non-landing pad.

We also forbid the user from extracting the landing pad block by itself. Again,
this is not a valid transformation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140083 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-09-19 23:00:52 +00:00
parent 11f23c1a72
commit ad027053fe
1 changed files with 8 additions and 1 deletions
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9
lib/Transforms/Utils/CodeExtractor.cpp
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@ -664,7 +664,13 @@ ExtractCodeRegion(const std::vector<BasicBlock*> &code) {
// * Pass in uses as args
// 3) Move code region, add call instr to func
//
BlocksToExtract.insert(code.begin(), code.end());
for (std::vector<BasicBlock*>::const_iterator
I = code.begin(), E = code.end(); I != E; ++I) {
BasicBlock *BB = *I;
BlocksToExtract.insert(BB);
if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator()))
BlocksToExtract.insert(II->getUnwindDest());
}
Values inputs, outputs;
@ -788,6 +794,7 @@ Function* llvm::ExtractLoop(DominatorTree &DT, Loop *L, bool AggregateArgs) {
/// ExtractBasicBlock - slurp a basic block into a brand new function
///
Function* llvm::ExtractBasicBlock(BasicBlock *BB, bool AggregateArgs) {
if (BB->isLandingPad()) return 0;
std::vector<BasicBlock*> Blocks;
Blocks.push_back(BB);
return CodeExtractor(0, AggregateArgs).ExtractCodeRegion(Blocks);