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[msan] Make -msan-check-constant-shadow a bit stronger.

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Allow (under the experimental flag) non-Instructions to participate in MSan checks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220601 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov
2014-10-24 23:34:15 +00:00
parent c498284e46
commit e376441786
2 changed files with 25 additions and 3 deletions
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13
lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@@ -1062,9 +1062,16 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
/// UMR warning in runtime if the value is not fully defined.
void insertShadowCheck(Value *Val, Instruction *OrigIns) {
assert(Val);
Instruction *Shadow = dyn_cast_or_null<Instruction>(getShadow(Val));
if (!Shadow) return;
Instruction *Origin = dyn_cast_or_null<Instruction>(getOrigin(Val));
Value *Shadow, *Origin;
if (ClCheckConstantShadow) {
Shadow = getShadow(Val);
if (!Shadow) return;
Origin = getOrigin(Val);
} else {
Shadow = dyn_cast_or_null<Instruction>(getShadow(Val));
if (!Shadow) return;
Origin = dyn_cast_or_null<Instruction>(getOrigin(Val));
}
insertShadowCheck(Shadow, Origin, OrigIns);
}