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Consistently use AliasAnalysis::UnknownSize instead of hardcoding ~0u.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116815 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-10-19 17:06:23 +00:00
parent 99fca5de96
commit f3a925dc7a
5 changed files with 34 additions and 25 deletions
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lib/Analysis/Lint.cpp
+25 -16
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@@ -191,7 +191,8 @@ void Lint::visitCallSite(CallSite CS) {
Instruction &I = *CS.getInstruction();
Value *Callee = CS.getCalledValue();
visitMemoryReference(I, Callee, ~0u, 0, 0, MemRef::Callee);
visitMemoryReference(I, Callee, AliasAnalysis::UnknownSize,
0, 0, MemRef::Callee);
if (Function *F = dyn_cast<Function>(findValue(Callee, /*OffsetOk=*/false))) {
Assert1(CS.getCallingConv() == F->getCallingConv(),
@@ -264,9 +265,11 @@ void Lint::visitCallSite(CallSite CS) {
case Intrinsic::memcpy: {
MemCpyInst *MCI = cast<MemCpyInst>(&I);
// TODO: If the size is known, use it.
visitMemoryReference(I, MCI->getDest(), ~0u, MCI->getAlignment(), 0,
visitMemoryReference(I, MCI->getDest(), AliasAnalysis::UnknownSize,
MCI->getAlignment(), 0,
MemRef::Write);
visitMemoryReference(I, MCI->getSource(), ~0u, MCI->getAlignment(), 0,
visitMemoryReference(I, MCI->getSource(), AliasAnalysis::UnknownSize,
MCI->getAlignment(), 0,
MemRef::Read);
// Check that the memcpy arguments don't overlap. The AliasAnalysis API
@@ -286,16 +289,19 @@ void Lint::visitCallSite(CallSite CS) {
case Intrinsic::memmove: {
MemMoveInst *MMI = cast<MemMoveInst>(&I);
// TODO: If the size is known, use it.
visitMemoryReference(I, MMI->getDest(), ~0u, MMI->getAlignment(), 0,
visitMemoryReference(I, MMI->getDest(), AliasAnalysis::UnknownSize,
MMI->getAlignment(), 0,
MemRef::Write);
visitMemoryReference(I, MMI->getSource(), ~0u, MMI->getAlignment(), 0,
visitMemoryReference(I, MMI->getSource(), AliasAnalysis::UnknownSize,
MMI->getAlignment(), 0,
MemRef::Read);
break;
}
case Intrinsic::memset: {
MemSetInst *MSI = cast<MemSetInst>(&I);
// TODO: If the size is known, use it.
visitMemoryReference(I, MSI->getDest(), ~0u, MSI->getAlignment(), 0,
visitMemoryReference(I, MSI->getDest(), AliasAnalysis::UnknownSize,
MSI->getAlignment(), 0,
MemRef::Write);
break;
}
@@ -305,24 +311,26 @@ void Lint::visitCallSite(CallSite CS) {
"Undefined behavior: va_start called in a non-varargs function",
&I);
visitMemoryReference(I, CS.getArgument(0), ~0u, 0, 0,
MemRef::Read | MemRef::Write);
visitMemoryReference(I, CS.getArgument(0), AliasAnalysis::UnknownSize,
0, 0, MemRef::Read | MemRef::Write);
break;
case Intrinsic::vacopy:
visitMemoryReference(I, CS.getArgument(0), ~0u, 0, 0, MemRef::Write);
visitMemoryReference(I, CS.getArgument(1), ~0u, 0, 0, MemRef::Read);
visitMemoryReference(I, CS.getArgument(0), AliasAnalysis::UnknownSize,
0, 0, MemRef::Write);
visitMemoryReference(I, CS.getArgument(1), AliasAnalysis::UnknownSize,
0, 0, MemRef::Read);
break;
case Intrinsic::vaend:
visitMemoryReference(I, CS.getArgument(0), ~0u, 0, 0,
MemRef::Read | MemRef::Write);
visitMemoryReference(I, CS.getArgument(0), AliasAnalysis::UnknownSize,
0, 0, MemRef::Read | MemRef::Write);
break;
case Intrinsic::stackrestore:
// Stackrestore doesn't read or write memory, but it sets the
// stack pointer, which the compiler may read from or write to
// at any time, so check it for both readability and writeability.
visitMemoryReference(I, CS.getArgument(0), ~0u, 0, 0,
MemRef::Read | MemRef::Write);
visitMemoryReference(I, CS.getArgument(0), AliasAnalysis::UnknownSize,
0, 0, MemRef::Read | MemRef::Write);
break;
}
}
@@ -495,12 +503,13 @@ void Lint::visitAllocaInst(AllocaInst &I) {
}
void Lint::visitVAArgInst(VAArgInst &I) {
visitMemoryReference(I, I.getOperand(0), ~0u, 0, 0,
visitMemoryReference(I, I.getOperand(0), AliasAnalysis::UnknownSize, 0, 0,
MemRef::Read | MemRef::Write);
}
void Lint::visitIndirectBrInst(IndirectBrInst &I) {
visitMemoryReference(I, I.getAddress(), ~0u, 0, 0, MemRef::Branchee);
visitMemoryReference(I, I.getAddress(), AliasAnalysis::UnknownSize, 0, 0,
MemRef::Branchee);
Assert1(I.getNumDestinations() != 0,
"Undefined behavior: indirectbr with no destinations", &I);