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PHI nodes are not allowed to exist with zero incoming values, check that

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there aren't any like this.

llvm-svn: 4044
This commit is contained in:
Chris Lattner 2002-10-06 21:00:31 +00:00
parent 6932399f9b
commit 53a414c3c4
1 changed files with 7 additions and 0 deletions
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7
lib/VMCore/Verifier.cpp
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@ -17,6 +17,7 @@
// * Only phi nodes can be self referential: 'add int %0, %0 ; <int>:0' is bad
// * PHI nodes must have an entry for each predecessor, with no extras.
// * PHI nodes must be the first thing in a basic block, all grouped together
// * PHI nodes must have at least one entry
// * All basic blocks should only end with terminator insts, not contain them
// * The entry node to a function must not have predecessors
// * All Instructions must be embeded into a basic block
@ -258,6 +259,12 @@ void Verifier::visitPHINode(PHINode &PN) {
"PHI nodes not grouped at top of basic block!",
&PN, PN.getParent());
// Ensure that PHI nodes have at least one entry!
Assert1(PN.getNumIncomingValues() != 0,
"PHI nodes must have at least one entry. If the block is dead, "
"the PHI should be removed!",
&PN);
std::vector<BasicBlock*> Preds(pred_begin(PN.getParent()),
pred_end(PN.getParent()));
// Loop over all of the incoming values, make sure that there are