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Check if a block has a terminator first before calling front() on

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it. If a block has a terminator then it is certainly non-empty so the
verifier will not crash on it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18484 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos
2004-12-04 02:30:42 +00:00
parent 8b42b43dc2
commit 4f4cf99a86
1 changed files with 3 additions and 3 deletions
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6
lib/VMCore/Verifier.cpp
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@@ -321,6 +321,9 @@ void Verifier::visitFunction(Function &F) {
void Verifier::visitBasicBlock(BasicBlock &BB) { void Verifier::visitBasicBlock(BasicBlock &BB) {
InstsInThisBlock.clear(); InstsInThisBlock.clear();
// Ensure that basic blocks have terminators!
Assert1(BB.getTerminator(), "Basic Block does not have terminator!", &BB);
// Check constraints that this basic block imposes on all of the PHI nodes in // Check constraints that this basic block imposes on all of the PHI nodes in
// it. // it.
if (isa<PHINode>(BB.front())) { if (isa<PHINode>(BB.front())) {
@@ -364,9 +367,6 @@ void Verifier::visitBasicBlock(BasicBlock &BB) {
} }
} }
} }
// Ensure that basic blocks have terminators!
Assert1(BB.getTerminator(), "Basic Block does not have terminator!", &BB);
} }
void Verifier::visitTerminatorInst(TerminatorInst &I) { void Verifier::visitTerminatorInst(TerminatorInst &I) {