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Make getModRefInfo(Instruction *) not crash on certain types of instructions

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236023 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Berlin 2015-04-28 19:19:14 +00:00
parent 3813ef6886
commit b1e1aa04ed
2 changed files with 23 additions and 10 deletions
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23
lib/Analysis/AliasAnalysis.cpp
View File

@ -379,15 +379,18 @@ AliasAnalysis::getModRefInfo(const StoreInst *S, const Location &Loc) {
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(const VAArgInst *V, const Location &Loc) {
// If the va_arg address cannot alias the pointer in question, then the
// specified memory cannot be accessed by the va_arg.
if (!alias(getLocation(V), Loc))
return NoModRef;
// If the pointer is a pointer to constant memory, then it could not have been
// modified by this va_arg.
if (pointsToConstantMemory(Loc))
return NoModRef;
if (Loc.Ptr) {
// If the va_arg address cannot alias the pointer in question, then the
// specified memory cannot be accessed by the va_arg.
if (!alias(getLocation(V), Loc))
return NoModRef;
// If the pointer is a pointer to constant memory, then it could not have
// been modified by this va_arg.
if (pointsToConstantMemory(Loc))
return NoModRef;
}
// Otherwise, a va_arg reads and writes.
return ModRef;
@ -400,7 +403,7 @@ AliasAnalysis::getModRefInfo(const AtomicCmpXchgInst *CX, const Location &Loc) {
return ModRef;
// If the cmpxchg address does not alias the location, it does not access it.
if (!alias(getLocation(CX), Loc))
if (Loc.Ptr && !alias(getLocation(CX), Loc))
return NoModRef;
return ModRef;
@ -413,7 +416,7 @@ AliasAnalysis::getModRefInfo(const AtomicRMWInst *RMW, const Location &Loc) {
return ModRef;
// If the atomicrmw address does not alias the location, it does not access it.
if (!alias(getLocation(RMW), Loc))
if (Loc.Ptr && !alias(getLocation(RMW), Loc))
return NoModRef;
return ModRef;

10
unittests/Analysis/AliasAnalysisTest.cpp
View File

@ -81,6 +81,13 @@ TEST_F(AliasAnalysisTest, getModRefInfo) {
auto *Store1 = new StoreInst(Value, Addr, BB);
auto *Load1 = new LoadInst(Addr, "load", BB);
auto *Add1 = BinaryOperator::CreateAdd(Value, Value, "add", BB);
auto *VAArg1 = new VAArgInst(Addr, PtrType, "vaarg", BB);
auto *CmpXChg1 = new AtomicCmpXchgInst(Addr, ConstantInt::get(IntType, 0),
ConstantInt::get(IntType, 1),
Monotonic, Monotonic, CrossThread, BB);
auto *AtomicRMW =
new AtomicRMWInst(AtomicRMWInst::Xchg, Addr, ConstantInt::get(IntType, 1),
Monotonic, CrossThread, BB);
ReturnInst::Create(C, nullptr, BB);
@ -88,6 +95,9 @@ TEST_F(AliasAnalysisTest, getModRefInfo) {
CheckModRef(Store1, AliasAnalysis::ModRefResult::Mod);
CheckModRef(Load1, AliasAnalysis::ModRefResult::Ref);
CheckModRef(Add1, AliasAnalysis::ModRefResult::NoModRef);
CheckModRef(VAArg1, AliasAnalysis::ModRefResult::ModRef);
CheckModRef(CmpXChg1, AliasAnalysis::ModRefResult::ModRef);
CheckModRef(AtomicRMW, AliasAnalysis::ModRefResult::ModRef);
}
} // end anonymous namspace