void visitCallSite(CallSite CS);
void visitMemoryReference(Instruction &I, Value *Ptr,
- unsigned Size, unsigned Align,
- const Type *Ty, unsigned Flags);
+ uint64_t Size, unsigned Align,
+ Type *Ty, unsigned Flags);
void visitCallInst(CallInst &I);
void visitInvokeInst(InvokeInst &I);
raw_string_ostream MessagesStr;
static char ID; // Pass identification, replacement for typeid
- Lint() : FunctionPass(&ID), MessagesStr(Messages) {}
+ Lint() : FunctionPass(ID), MessagesStr(Messages) {
+ initializeLintPass(*PassRegistry::getPassRegistry());
+ }
virtual bool runOnFunction(Function &F);
}
}
- void WriteType(const Type *T) {
- if (!T) return;
- MessagesStr << ' ';
- WriteTypeSymbolic(MessagesStr, T, Mod);
- }
-
// CheckFailed - A check failed, so print out the condition and the message
// that failed. This provides a nice place to put a breakpoint if you want
// to see why something is not correct.
WriteValue(V3);
WriteValue(V4);
}
-
- void CheckFailed(const Twine &Message, const Value *V1,
- const Type *T2, const Value *V3 = 0) {
- MessagesStr << Message.str() << "\n";
- WriteValue(V1);
- WriteType(T2);
- WriteValue(V3);
- }
-
- void CheckFailed(const Twine &Message, const Type *T1,
- const Type *T2 = 0, const Type *T3 = 0) {
- MessagesStr << Message.str() << "\n";
- WriteType(T1);
- WriteType(T2);
- WriteType(T3);
- }
};
}
char Lint::ID = 0;
-static RegisterPass<Lint>
-X("lint", "Statically lint-checks LLVM IR", false, true);
+INITIALIZE_PASS_BEGIN(Lint, "lint", "Statically lint-checks LLVM IR",
+ false, true)
+INITIALIZE_PASS_DEPENDENCY(DominatorTree)
+INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
+INITIALIZE_PASS_END(Lint, "lint", "Statically lint-checks LLVM IR",
+ false, true)
// Assert - We know that cond should be true, if not print an error message.
#define Assert(C, M) \
// fairly common mistake to neglect to name a function.
Assert1(F.hasName() || F.hasLocalLinkage(),
"Unusual: Unnamed function with non-local linkage", &F);
+
+ // TODO: Check for irreducible control flow.
}
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(),
"Undefined behavior: Caller and callee calling convention differ",
&I);
- const FunctionType *FT = F->getFunctionType();
+ FunctionType *FT = F->getFunctionType();
unsigned NumActualArgs = unsigned(CS.arg_end()-CS.arg_begin());
Assert1(FT->isVarArg() ?
"Undefined behavior: Call argument count mismatches callee "
"argument count", &I);
+ Assert1(FT->getReturnType() == I.getType(),
+ "Undefined behavior: Call return type mismatches "
+ "callee return type", &I);
+
// Check argument types (in case the callee was casted) and attributes.
+ // TODO: Verify that caller and callee attributes are compatible.
Function::arg_iterator PI = F->arg_begin(), PE = F->arg_end();
CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
for (; AI != AE; ++AI) {
"Undefined behavior: Call argument type mismatches "
"callee parameter type", &I);
- // Check that noalias arguments don't alias other arguments. The
- // AliasAnalysis API isn't expressive enough for what we really want
- // to do. Known partial overlap is not distinguished from the case
- // where nothing is known.
+ // Check that noalias arguments don't alias other arguments. This is
+ // not fully precise because we don't know the sizes of the dereferenced
+ // memory regions.
if (Formal->hasNoAliasAttr() && Actual->getType()->isPointerTy())
- for (CallSite::arg_iterator BI = CS.arg_begin(); BI != AE; ++BI) {
- Assert1(AI == BI ||
- AA->alias(*AI, ~0u, *BI, ~0u) != AliasAnalysis::MustAlias,
- "Unusual: noalias argument aliases another argument", &I);
- }
+ for (CallSite::arg_iterator BI = CS.arg_begin(); BI != AE; ++BI)
+ if (AI != BI && (*BI)->getType()->isPointerTy()) {
+ AliasAnalysis::AliasResult Result = AA->alias(*AI, *BI);
+ Assert1(Result != AliasAnalysis::MustAlias &&
+ Result != AliasAnalysis::PartialAlias,
+ "Unusual: noalias argument aliases another argument", &I);
+ }
// Check that an sret argument points to valid memory.
if (Formal->hasStructRetAttr() && Actual->getType()->isPointerTy()) {
- const Type *Ty =
+ Type *Ty =
cast<PointerType>(Formal->getType())->getElementType();
visitMemoryReference(I, Actual, AA->getTypeStoreSize(Ty),
TD ? TD->getABITypeAlignment(Ty) : 0,
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
// isn't expressive enough for what we really want to do. Known partial
// overlap is not distinguished from the case where nothing is known.
- unsigned Size = 0;
+ uint64_t Size = 0;
if (const ConstantInt *Len =
dyn_cast<ConstantInt>(findValue(MCI->getLength(),
/*OffsetOk=*/false)))
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;
}
"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;
}
}
}
// TODO: Check that the reference is in bounds.
+// TODO: Check readnone/readonly function attributes.
void Lint::visitMemoryReference(Instruction &I,
- Value *Ptr, unsigned Size, unsigned Align,
- const Type *Ty, unsigned Flags) {
+ Value *Ptr, uint64_t Size, unsigned Align,
+ Type *Ty, unsigned Flags) {
// If no memory is being referenced, it doesn't matter if the pointer
// is valid.
if (Size == 0)
// This isn't undefined behavior, it's just an obvious pessimization.
Assert1(&I.getParent()->getParent()->getEntryBlock() == I.getParent(),
"Pessimization: Static alloca outside of entry block", &I);
+
+ // TODO: Check for an unusual size (MSB set?)
}
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);
}
void Lint::visitExtractElementInst(ExtractElementInst &I) {
// TODO: Look through eliminable cast pairs.
// TODO: Look through calls with unique return values.
// TODO: Look through vector insert/extract/shuffle.
- V = OffsetOk ? V->getUnderlyingObject() : V->stripPointerCasts();
+ V = OffsetOk ? GetUnderlyingObject(V, TD) : V->stripPointerCasts();
if (LoadInst *L = dyn_cast<LoadInst>(V)) {
BasicBlock::iterator BBI = L;
BasicBlock *BB = L->getParent();
BBI = BB->end();
}
} else if (PHINode *PN = dyn_cast<PHINode>(V)) {
- if (Value *W = PN->hasConstantValue(DT))
- return findValueImpl(W, OffsetOk, Visited);
+ if (Value *W = PN->hasConstantValue())
+ if (W != V)
+ return findValueImpl(W, OffsetOk, Visited);
} else if (CastInst *CI = dyn_cast<CastInst>(V)) {
if (CI->isNoopCast(TD ? TD->getIntPtrType(V->getContext()) :
Type::getInt64Ty(V->getContext())))
return findValueImpl(CI->getOperand(0), OffsetOk, Visited);
} else if (ExtractValueInst *Ex = dyn_cast<ExtractValueInst>(V)) {
if (Value *W = FindInsertedValue(Ex->getAggregateOperand(),
- Ex->idx_begin(),
- Ex->idx_end()))
+ Ex->getIndices()))
if (W != V)
return findValueImpl(W, OffsetOk, Visited);
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
Type::getInt64Ty(V->getContext())))
return findValueImpl(CE->getOperand(0), OffsetOk, Visited);
} else if (CE->getOpcode() == Instruction::ExtractValue) {
- const SmallVector<unsigned, 4> &Indices = CE->getIndices();
- if (Value *W = FindInsertedValue(CE->getOperand(0),
- Indices.begin(),
- Indices.end()))
+ ArrayRef<unsigned> Indices = CE->getIndices();
+ if (Value *W = FindInsertedValue(CE->getOperand(0), Indices))
if (W != V)
return findValueImpl(W, OffsetOk, Visited);
}
// As a last resort, try SimplifyInstruction or constant folding.
if (Instruction *Inst = dyn_cast<Instruction>(V)) {
- if (Value *W = SimplifyInstruction(Inst, TD))
- if (W != Inst)
- return findValueImpl(W, OffsetOk, Visited);
+ if (Value *W = SimplifyInstruction(Inst, TD, DT))
+ return findValueImpl(W, OffsetOk, Visited);
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
if (Value *W = ConstantFoldConstantExpression(CE, TD))
if (W != V)
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