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Verifier: Check for null operands in !llvm.module.flags

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228818 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2015-02-11 09:13:06 +00:00
parent 0686b8affc
commit f937622ece
3 changed files with 9 additions and 3 deletions
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4
lib/IR/Module.cpp
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@ -278,7 +278,7 @@ void Module::eraseNamedMetadata(NamedMDNode *NMD) {
}
bool Module::isValidModFlagBehavior(Metadata *MD, ModFlagBehavior &MFB) {
if (ConstantInt *Behavior = mdconst::dyn_extract<ConstantInt>(MD)) {
if (ConstantInt *Behavior = mdconst::dyn_extract_or_null<ConstantInt>(MD)) {
uint64_t Val = Behavior->getLimitedValue();
if (Val >= ModFlagBehaviorFirstVal && Val <= ModFlagBehaviorLastVal) {
MFB = static_cast<ModFlagBehavior>(Val);
@ -298,7 +298,7 @@ getModuleFlagsMetadata(SmallVectorImpl<ModuleFlagEntry> &Flags) const {
ModFlagBehavior MFB;
if (Flag->getNumOperands() >= 3 &&
isValidModFlagBehavior(Flag->getOperand(0), MFB) &&
isa<MDString>(Flag->getOperand(1))) {
dyn_cast_or_null<MDString>(Flag->getOperand(1))) {
// Check the operands of the MDNode before accessing the operands.
// The verifier will actually catch these failures.
MDString *Key = cast<MDString>(Flag->getOperand(1));