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Fix PR 2160 by making sure arguments to external functions get marked as pointing to anything

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48509 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Berlin 2008-03-18 22:22:53 +00:00
parent 856ce2da14
commit d3bf1aef3f
2 changed files with 52 additions and 20 deletions
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58
lib/Analysis/IPA/Andersens.cpp
View File

@ -647,9 +647,13 @@ Andersens::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
if (N1->PointsTo->empty())
return NoModRef;
#if FULL_UNIVERSAL
if (!UniversalSet->PointsTo->test(FindNode(getNode(P))))
return NoModRef; // Universal set does not contain P
#else
if (!N1->PointsTo->test(UniversalSet))
return NoModRef; // P doesn't point to the universal set.
#endif
}
return AliasAnalysis::getModRefInfo(CS, P, Size);
@ -1266,29 +1270,43 @@ void Andersens::AddConstraintsForCall(CallSite CS, Function *F) {
}
CallSite::arg_iterator ArgI = CS.arg_begin(), ArgE = CS.arg_end();
bool external = !F || F->isDeclaration();
if (F) {
// Direct Call
Function::arg_iterator AI = F->arg_begin(), AE = F->arg_end();
for (; AI != AE && ArgI != ArgE; ++AI, ++ArgI)
if (isa<PointerType>(AI->getType())) {
if (isa<PointerType>((*ArgI)->getType())) {
// Copy the actual argument into the formal argument.
Constraints.push_back(Constraint(Constraint::Copy, getNode(AI),
getNode(*ArgI)));
} else {
Constraints.push_back(Constraint(Constraint::Copy, getNode(AI),
UniversalSet));
}
} else if (isa<PointerType>((*ArgI)->getType())) {
#if FULL_UNIVERSAL
Constraints.push_back(Constraint(Constraint::Copy,
UniversalSet,
getNode(*ArgI)));
#else
Constraints.push_back(Constraint(Constraint::Copy,
getNode(*ArgI),
UniversalSet));
for (; AI != AE && ArgI != ArgE; ++AI, ++ArgI)
{
#if !FULL_UNIVERSAL
if (external && isa<PointerType>((*ArgI)->getType()))
{
// Add constraint that ArgI can now point to anything due to
// escaping, as can everything it points to. The second portion of
// this should be taken care of by universal = *universal
Constraints.push_back(Constraint(Constraint::Copy,
getNode(*ArgI),
UniversalSet));
}
#endif
if (isa<PointerType>(AI->getType())) {
if (isa<PointerType>((*ArgI)->getType())) {
// Copy the actual argument into the formal argument.
Constraints.push_back(Constraint(Constraint::Copy, getNode(AI),
getNode(*ArgI)));
} else {
Constraints.push_back(Constraint(Constraint::Copy, getNode(AI),
UniversalSet));
}
} else if (isa<PointerType>((*ArgI)->getType())) {
#if FULL_UNIVERSAL
Constraints.push_back(Constraint(Constraint::Copy,
UniversalSet,
getNode(*ArgI)));
#else
Constraints.push_back(Constraint(Constraint::Copy,
getNode(*ArgI),
UniversalSet));
#endif
}
}
} else {
//Indirect Call

14
test/Analysis/Andersens/modreftest2.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: llvm-as < %s | opt -anders-aa -gvn | llvm-dis \
; RUN: | not grep {ret i32 undef}
;; From PR 2160
declare void @f(i32*)
define i32 @g() {
entry:
%tmp = alloca i32 ; <i32*> [#uses=2]
call void @f( i32* %tmp )
%tmp2 = load i32* %tmp ; <i32> [#uses=1]
ret i32 %tmp2
}