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fix PR6112 - When globalopt (or any other pass) does RAUW(@G, %G),

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metadata references in non-function-local MDNodes should drop to 
null.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102519 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-04-28 20:16:12 +00:00
parent 59b3655564
commit f3f325b82f
2 changed files with 34 additions and 2 deletions
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lib/VMCore/Metadata.cpp
+15 -2
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@@ -178,6 +178,13 @@ void MDNode::destroy() {
free(this);
}
/// isFunctionLocalValue - Return true if this is a value that would require a
/// function-local MDNode.
static bool isFunctionLocalValue(Value *V) {
return isa<Instruction>(V) || isa<Argument>(V) || isa<BasicBlock>(V) ||
(isa<MDNode>(V) && cast<MDNode>(V)->isFunctionLocal());
}
MDNode *MDNode::getMDNode(LLVMContext &Context, Value *const *Vals,
unsigned NumVals, FunctionLocalness FL,
bool Insert) {
@@ -188,8 +195,7 @@ MDNode *MDNode::getMDNode(LLVMContext &Context, Value *const *Vals,
for (unsigned i = 0; i != NumVals; ++i) {
Value *V = Vals[i];
if (!V) continue;
if (isa<Instruction>(V) || isa<Argument>(V) || isa<BasicBlock>(V) ||
(isa<MDNode>(V) && cast<MDNode>(V)->isFunctionLocal())) {
if (isFunctionLocalValue(V)) {
isFunctionLocal = true;
break;
}
@@ -262,6 +268,13 @@ void MDNode::setIsNotUniqued() {
void MDNode::replaceOperand(MDNodeOperand *Op, Value *To) {
Value *From = *Op;
// If is possible that someone did GV->RAUW(inst), replacing a global variable
// with an instruction or some other function-local object. If this is a
// non-function-local MDNode, it can't point to a function-local object.
// Handle this case by implicitly dropping the MDNode reference to null.
if (!isFunctionLocal() && To && isFunctionLocalValue(To))
To = 0;
if (From == To)
return;