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Fix a bug where we would evaluate stores into linkonce objects which could be
potentially replaced at link-time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23463 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1239,13 +1239,18 @@ static Constant *getVal(std::map<Value*, Constant*> &ComputedValues,
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/// we punt. We basically just support direct accesses to globals and GEP's of
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/// globals. This should be kept up to date with CommitValueTo.
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static bool isSimpleEnoughPointerToCommit(Constant *C) {
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
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if (!GV->hasExternalLinkage() && !GV->hasInternalLinkage())
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return false; // do not allow weak/linkonce linkage.
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return !GV->isExternal(); // reject external globals.
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}
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
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// Handle a constantexpr gep.
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if (CE->getOpcode() == Instruction::GetElementPtr &&
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isa<GlobalVariable>(CE->getOperand(0))) {
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GlobalVariable *GV = cast<GlobalVariable>(CE->getOperand(0));
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if (!GV->hasExternalLinkage() && !GV->hasInternalLinkage())
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return false; // do not allow weak/linkonce linkage.
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return GV->hasInitializer() &&
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ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE);
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}
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