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add support for GlobalAlias to ObjectSizeOffsetVisitor

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llvm-svn: 171303
This commit is contained in:
Nuno Lopes 2012-12-31 16:23:48 +00:00
parent 812bc66ae6
commit be740c67e2
2 changed files with 10 additions and 0 deletions
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1
include/llvm/Analysis/MemoryBuiltins.h
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@ -191,6 +191,7 @@ public:
SizeOffsetType visitExtractElementInst(ExtractElementInst &I);
SizeOffsetType visitExtractValueInst(ExtractValueInst &I);
SizeOffsetType visitGEPOperator(GEPOperator &GEP);
SizeOffsetType visitGlobalAlias(GlobalAlias &GA);
SizeOffsetType visitGlobalVariable(GlobalVariable &GV);
SizeOffsetType visitIntToPtrInst(IntToPtrInst&);
SizeOffsetType visitLoadInst(LoadInst &I);

9
lib/Analysis/MemoryBuiltins.cpp
View File

@ -399,6 +399,8 @@ SizeOffsetType ObjectSizeOffsetVisitor::compute(Value *V) {
return visitArgument(*A);
if (ConstantPointerNull *P = dyn_cast<ConstantPointerNull>(V))
return visitConstantPointerNull(*P);
if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
return visitGlobalAlias(*GA);
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
return visitGlobalVariable(*GV);
if (UndefValue *UV = dyn_cast<UndefValue>(V))
@ -517,6 +519,12 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitGEPOperator(GEPOperator &GEP) {
return std::make_pair(PtrData.first, PtrData.second + Offset);
}
SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalAlias(GlobalAlias &GA) {
if (GA.mayBeOverridden())
return unknown();
return compute(GA.getAliasee());
}
SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalVariable(GlobalVariable &GV){
if (!GV.hasDefinitiveInitializer())
return unknown();
@ -629,6 +637,7 @@ SizeOffsetEvalType ObjectSizeOffsetEvaluator::compute_(Value *V) {
} else if (isa<Argument>(V) ||
(isa<ConstantExpr>(V) &&
cast<ConstantExpr>(V)->getOpcode() == Instruction::IntToPtr) ||
isa<GlobalAlias>(V) ||
isa<GlobalVariable>(V)) {
// ignore values where we cannot do more than what ObjectSizeVisitor can
Result = unknown();