-//===-- Verifier.cpp - Implement the Module Verifier -------------*- C++ -*-==//
+//===-- Verifier.cpp - Implement the Module Verifier -----------------------==//
//
// The LLVM Compiler Infrastructure
//
// * It is illegal to have a ret instruction that returns a value that does not
// agree with the function return value type.
// * Function call argument types match the function prototype
+// * A landing pad is defined by a landingpad instruction, and can be jumped to
+// only by the unwind edge of an invoke instruction.
+// * A landingpad instruction must be the first non-PHI instruction in the
+// block.
+// * All landingpad instructions must use the same personality function with
+// the same function.
// * All other things that are tested by asserts spread about the code...
//
//===----------------------------------------------------------------------===//
#include "llvm/DerivedTypes.h"
#include "llvm/InlineAsm.h"
#include "llvm/IntrinsicInst.h"
+#include "llvm/LLVMContext.h"
#include "llvm/Metadata.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
struct Verifier : public FunctionPass, public InstVisitor<Verifier> {
static char ID; // Pass ID, replacement for typeid
bool Broken; // Is this module found to be broken?
- bool RealPass; // Are we not being run by a PassManager?
VerifierFailureAction action;
// What to do if verification fails.
Module *Mod; // Module we are verifying right now
/// already.
SmallPtrSet<MDNode *, 32> MDNodes;
+ /// PersonalityFn - The personality function referenced by the
+ /// LandingPadInsts. All LandingPadInsts within the same function must use
+ /// the same personality function.
+ const Value *PersonalityFn;
+
Verifier()
- : FunctionPass(ID),
- Broken(false), RealPass(true), action(AbortProcessAction),
- Mod(0), Context(0), DT(0), MessagesStr(Messages) {
- initializeVerifierPass(*PassRegistry::getPassRegistry());
- }
+ : FunctionPass(ID), Broken(false),
+ action(AbortProcessAction), Mod(0), Context(0), DT(0),
+ MessagesStr(Messages), PersonalityFn(0) {
+ initializeVerifierPass(*PassRegistry::getPassRegistry());
+ }
explicit Verifier(VerifierFailureAction ctn)
- : FunctionPass(ID),
- Broken(false), RealPass(true), action(ctn), Mod(0), Context(0), DT(0),
- MessagesStr(Messages) {
- initializeVerifierPass(*PassRegistry::getPassRegistry());
- }
+ : FunctionPass(ID), Broken(false), action(ctn), Mod(0),
+ Context(0), DT(0), MessagesStr(Messages), PersonalityFn(0) {
+ initializeVerifierPass(*PassRegistry::getPassRegistry());
+ }
bool doInitialization(Module &M) {
Mod = &M;
Context = &M.getContext();
- // If this is a real pass, in a pass manager, we must abort before
- // returning back to the pass manager, or else the pass manager may try to
- // run other passes on the broken module.
- if (RealPass)
- return abortIfBroken();
- return false;
+ // We must abort before returning back to the pass manager, or else the
+ // pass manager may try to run other passes on the broken module.
+ return abortIfBroken();
}
bool runOnFunction(Function &F) {
// Get dominator information if we are being run by PassManager
- if (RealPass) DT = &getAnalysis<DominatorTree>();
+ DT = &getAnalysis<DominatorTree>();
Mod = F.getParent();
if (!Context) Context = &F.getContext();
visit(F);
InstsInThisBlock.clear();
+ PersonalityFn = 0;
- // If this is a real pass, in a pass manager, we must abort before
- // returning back to the pass manager, or else the pass manager may try to
- // run other passes on the broken module.
- if (RealPass)
- return abortIfBroken();
-
- return false;
+ // We must abort before returning back to the pass manager, or else the
+ // pass manager may try to run other passes on the broken module.
+ return abortIfBroken();
}
bool doFinalization(Module &M) {
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequiredID(PreVerifyID);
- if (RealPass)
- AU.addRequired<DominatorTree>();
+ AU.addRequired<DominatorTree>();
}
/// abortIfBroken - If the module is broken and we are supposed to abort on
if (!Broken) return false;
MessagesStr << "Broken module found, ";
switch (action) {
- default: llvm_unreachable("Unknown action");
case AbortProcessAction:
MessagesStr << "compilation aborted!\n";
dbgs() << MessagesStr.str();
MessagesStr << "compilation terminated.\n";
return true;
}
+ llvm_unreachable("Invalid action");
}
void visitGetElementPtrInst(GetElementPtrInst &GEP);
void visitLoadInst(LoadInst &LI);
void visitStoreInst(StoreInst &SI);
+ void verifyDominatesUse(Instruction &I, unsigned i);
void visitInstruction(Instruction &I);
void visitTerminatorInst(TerminatorInst &I);
void visitBranchInst(BranchInst &BI);
void visitAllocaInst(AllocaInst &AI);
void visitExtractValueInst(ExtractValueInst &EVI);
void visitInsertValueInst(InsertValueInst &IVI);
+ void visitLandingPadInst(LandingPadInst &LPI);
void VerifyCallSite(CallSite CS);
bool PerformTypeCheck(Intrinsic::ID ID, Function *F, Type *Ty,
for (unsigned i = 0;
i < array_lengthof(Attribute::MutuallyIncompatible); ++i) {
Attributes MutI = Attrs & Attribute::MutuallyIncompatible[i];
- Assert1(!(MutI & (MutI - 1)), "Attributes " +
+ Assert1(MutI.isEmptyOrSingleton(), "Attributes " +
Attribute::getAsString(MutI) + " are incompatible!", V);
}
for (unsigned i = 0;
i < array_lengthof(Attribute::MutuallyIncompatible); ++i) {
Attributes MutI = FAttrs & Attribute::MutuallyIncompatible[i];
- Assert1(!(MutI & (MutI - 1)), "Attributes " +
+ Assert1(MutI.isEmptyOrSingleton(), "Attributes " +
Attribute::getAsString(MutI) + " are incompatible!", V);
}
}
// have the same type as the switched-on value.
Type *SwitchTy = SI.getCondition()->getType();
SmallPtrSet<ConstantInt*, 32> Constants;
- for (unsigned i = 1, e = SI.getNumCases(); i != e; ++i) {
- Assert1(SI.getCaseValue(i)->getType() == SwitchTy,
+ for (SwitchInst::CaseIt i = SI.case_begin(), e = SI.case_end(); i != e; ++i) {
+ Assert1(i.getCaseValue()->getType() == SwitchTy,
"Switch constants must all be same type as switch value!", &SI);
- Assert2(Constants.insert(SI.getCaseValue(i)),
- "Duplicate integer as switch case", &SI, SI.getCaseValue(i));
+ Assert2(Constants.insert(i.getCaseValue()),
+ "Duplicate integer as switch case", &SI, i.getCaseValue());
}
visitTerminatorInst(SI);
Type *SrcTy = I.getOperand(0)->getType();
Type *DestTy = I.getType();
- Assert1(SrcTy->isPointerTy(), "PtrToInt source must be pointer", &I);
- Assert1(DestTy->isIntegerTy(), "PtrToInt result must be integral", &I);
+ Assert1(SrcTy->getScalarType()->isPointerTy(),
+ "PtrToInt source must be pointer", &I);
+ Assert1(DestTy->getScalarType()->isIntegerTy(),
+ "PtrToInt result must be integral", &I);
+ Assert1(SrcTy->isVectorTy() == DestTy->isVectorTy(),
+ "PtrToInt type mismatch", &I);
+
+ if (SrcTy->isVectorTy()) {
+ VectorType *VSrc = dyn_cast<VectorType>(SrcTy);
+ VectorType *VDest = dyn_cast<VectorType>(DestTy);
+ Assert1(VSrc->getNumElements() == VDest->getNumElements(),
+ "PtrToInt Vector width mismatch", &I);
+ }
visitInstruction(I);
}
Type *SrcTy = I.getOperand(0)->getType();
Type *DestTy = I.getType();
- Assert1(SrcTy->isIntegerTy(), "IntToPtr source must be an integral", &I);
- Assert1(DestTy->isPointerTy(), "IntToPtr result must be a pointer",&I);
-
+ Assert1(SrcTy->getScalarType()->isIntegerTy(),
+ "IntToPtr source must be an integral", &I);
+ Assert1(DestTy->getScalarType()->isPointerTy(),
+ "IntToPtr result must be a pointer",&I);
+ Assert1(SrcTy->isVectorTy() == DestTy->isVectorTy(),
+ "IntToPtr type mismatch", &I);
+ if (SrcTy->isVectorTy()) {
+ VectorType *VSrc = dyn_cast<VectorType>(SrcTy);
+ VectorType *VDest = dyn_cast<VectorType>(DestTy);
+ Assert1(VSrc->getNumElements() == VDest->getNumElements(),
+ "IntToPtr Vector width mismatch", &I);
+ }
visitInstruction(I);
}
void Verifier::visitInvokeInst(InvokeInst &II) {
VerifyCallSite(&II);
+
+ // Verify that there is a landingpad instruction as the first non-PHI
+ // instruction of the 'unwind' destination.
+ Assert1(II.getUnwindDest()->isLandingPad(),
+ "The unwind destination does not have a landingpad instruction!",&II);
+
visitTerminatorInst(II);
}
Assert1(Op0Ty == Op1Ty,
"Both operands to ICmp instruction are not of the same type!", &IC);
// Check that the operands are the right type
- Assert1(Op0Ty->isIntOrIntVectorTy() || Op0Ty->isPointerTy(),
+ Assert1(Op0Ty->isIntOrIntVectorTy() || Op0Ty->getScalarType()->isPointerTy(),
"Invalid operand types for ICmp instruction", &IC);
// Check that the predicate is valid.
Assert1(IC.getPredicate() >= CmpInst::FIRST_ICMP_PREDICATE &&
}
void Verifier::visitGetElementPtrInst(GetElementPtrInst &GEP) {
- Assert1(cast<PointerType>(GEP.getOperand(0)->getType())
- ->getElementType()->isSized(),
+ Type *TargetTy = GEP.getPointerOperandType()->getScalarType();
+
+ Assert1(isa<PointerType>(TargetTy),
+ "GEP base pointer is not a vector or a vector of pointers", &GEP);
+ Assert1(cast<PointerType>(TargetTy)->getElementType()->isSized(),
"GEP into unsized type!", &GEP);
-
+
SmallVector<Value*, 16> Idxs(GEP.idx_begin(), GEP.idx_end());
Type *ElTy =
- GetElementPtrInst::getIndexedType(GEP.getOperand(0)->getType(), Idxs);
+ GetElementPtrInst::getIndexedType(GEP.getPointerOperandType(), Idxs);
Assert1(ElTy, "Invalid indices for GEP pointer type!", &GEP);
- Assert2(GEP.getType()->isPointerTy() &&
- cast<PointerType>(GEP.getType())->getElementType() == ElTy,
- "GEP is not of right type for indices!", &GEP, ElTy);
+
+ if (GEP.getPointerOperandType()->isPointerTy()) {
+ // Validate GEPs with scalar indices.
+ Assert2(GEP.getType()->isPointerTy() &&
+ cast<PointerType>(GEP.getType())->getElementType() == ElTy,
+ "GEP is not of right type for indices!", &GEP, ElTy);
+ } else {
+ // Validate GEPs with a vector index.
+ Assert1(Idxs.size() == 1, "Invalid number of indices!", &GEP);
+ Value *Index = Idxs[0];
+ Type *IndexTy = Index->getType();
+ Assert1(IndexTy->isVectorTy(),
+ "Vector GEP must have vector indices!", &GEP);
+ Assert1(GEP.getType()->isVectorTy(),
+ "Vector GEP must return a vector value", &GEP);
+ Type *ElemPtr = cast<VectorType>(GEP.getType())->getElementType();
+ Assert1(ElemPtr->isPointerTy(),
+ "Vector GEP pointer operand is not a pointer!", &GEP);
+ unsigned IndexWidth = cast<VectorType>(IndexTy)->getNumElements();
+ unsigned GepWidth = cast<VectorType>(GEP.getType())->getNumElements();
+ Assert1(IndexWidth == GepWidth, "Invalid GEP index vector width", &GEP);
+ Assert1(ElTy == cast<PointerType>(ElemPtr)->getElementType(),
+ "Vector GEP type does not match pointer type!", &GEP);
+ }
visitInstruction(GEP);
}
Type *ElTy = PTy->getElementType();
Assert2(ElTy == LI.getType(),
"Load result type does not match pointer operand type!", &LI, ElTy);
+ if (LI.isAtomic()) {
+ Assert1(LI.getOrdering() != Release && LI.getOrdering() != AcquireRelease,
+ "Load cannot have Release ordering", &LI);
+ Assert1(LI.getAlignment() != 0,
+ "Atomic load must specify explicit alignment", &LI);
+ } else {
+ Assert1(LI.getSynchScope() == CrossThread,
+ "Non-atomic load cannot have SynchronizationScope specified", &LI);
+ }
+
+ if (MDNode *Range = LI.getMetadata(LLVMContext::MD_range)) {
+ unsigned NumOperands = Range->getNumOperands();
+ Assert1(NumOperands % 2 == 0, "Unfinished range!", Range);
+ unsigned NumRanges = NumOperands / 2;
+ Assert1(NumRanges >= 1, "It should have at least one range!", Range);
+ for (unsigned i = 0; i < NumRanges; ++i) {
+ ConstantInt *Low = dyn_cast<ConstantInt>(Range->getOperand(2*i));
+ Assert1(Low, "The lower limit must be an integer!", Low);
+ ConstantInt *High = dyn_cast<ConstantInt>(Range->getOperand(2*i + 1));
+ Assert1(High, "The upper limit must be an integer!", High);
+ Assert1(High->getType() == Low->getType() &&
+ High->getType() == ElTy, "Range types must match load type!",
+ &LI);
+ Assert1(High->getValue() != Low->getValue(), "Range must not be empty!",
+ Range);
+ }
+ }
+
visitInstruction(LI);
}
Assert2(ElTy == SI.getOperand(0)->getType(),
"Stored value type does not match pointer operand type!",
&SI, ElTy);
+ if (SI.isAtomic()) {
+ Assert1(SI.getOrdering() != Acquire && SI.getOrdering() != AcquireRelease,
+ "Store cannot have Acquire ordering", &SI);
+ Assert1(SI.getAlignment() != 0,
+ "Atomic store must specify explicit alignment", &SI);
+ } else {
+ Assert1(SI.getSynchScope() == CrossThread,
+ "Non-atomic store cannot have SynchronizationScope specified", &SI);
+ }
visitInstruction(SI);
}
visitInstruction(IVI);
}
+void Verifier::visitLandingPadInst(LandingPadInst &LPI) {
+ BasicBlock *BB = LPI.getParent();
+
+ // The landingpad instruction is ill-formed if it doesn't have any clauses and
+ // isn't a cleanup.
+ Assert1(LPI.getNumClauses() > 0 || LPI.isCleanup(),
+ "LandingPadInst needs at least one clause or to be a cleanup.", &LPI);
+
+ // The landingpad instruction defines its parent as a landing pad block. The
+ // landing pad block may be branched to only by the unwind edge of an invoke.
+ for (pred_iterator I = pred_begin(BB), E = pred_end(BB); I != E; ++I) {
+ const InvokeInst *II = dyn_cast<InvokeInst>((*I)->getTerminator());
+ Assert1(II && II->getUnwindDest() == BB,
+ "Block containing LandingPadInst must be jumped to "
+ "only by the unwind edge of an invoke.", &LPI);
+ }
+
+ // The landingpad instruction must be the first non-PHI instruction in the
+ // block.
+ Assert1(LPI.getParent()->getLandingPadInst() == &LPI,
+ "LandingPadInst not the first non-PHI instruction in the block.",
+ &LPI);
+
+ // The personality functions for all landingpad instructions within the same
+ // function should match.
+ if (PersonalityFn)
+ Assert1(LPI.getPersonalityFn() == PersonalityFn,
+ "Personality function doesn't match others in function", &LPI);
+ PersonalityFn = LPI.getPersonalityFn();
+
+ // All operands must be constants.
+ Assert1(isa<Constant>(PersonalityFn), "Personality function is not constant!",
+ &LPI);
+ for (unsigned i = 0, e = LPI.getNumClauses(); i < e; ++i) {
+ Value *Clause = LPI.getClause(i);
+ Assert1(isa<Constant>(Clause), "Clause is not constant!", &LPI);
+ if (LPI.isCatch(i)) {
+ Assert1(isa<PointerType>(Clause->getType()),
+ "Catch operand does not have pointer type!", &LPI);
+ } else {
+ Assert1(LPI.isFilter(i), "Clause is neither catch nor filter!", &LPI);
+ Assert1(isa<ConstantArray>(Clause) || isa<ConstantAggregateZero>(Clause),
+ "Filter operand is not an array of constants!", &LPI);
+ }
+ }
+
+ visitInstruction(LPI);
+}
+
+void Verifier::verifyDominatesUse(Instruction &I, unsigned i) {
+ Instruction *Op = cast<Instruction>(I.getOperand(i));
+ BasicBlock *BB = I.getParent();
+ BasicBlock *OpBlock = Op->getParent();
+ PHINode *PN = dyn_cast<PHINode>(&I);
+
+ // DT can handle non phi instructions for us.
+ if (!PN) {
+ // Definition must dominate use unless use is unreachable!
+ Assert2(InstsInThisBlock.count(Op) || !DT->isReachableFromEntry(BB) ||
+ DT->dominates(Op, &I),
+ "Instruction does not dominate all uses!", Op, &I);
+ return;
+ }
+
+ // Check that a definition dominates all of its uses.
+ if (InvokeInst *II = dyn_cast<InvokeInst>(Op)) {
+ // Invoke results are only usable in the normal destination, not in the
+ // exceptional destination.
+ BasicBlock *NormalDest = II->getNormalDest();
+
+
+ // PHI nodes differ from other nodes because they actually "use" the
+ // value in the predecessor basic blocks they correspond to.
+ BasicBlock *UseBlock = BB;
+ unsigned j = PHINode::getIncomingValueNumForOperand(i);
+ UseBlock = PN->getIncomingBlock(j);
+ Assert2(UseBlock, "Invoke operand is PHI node with bad incoming-BB",
+ Op, &I);
+
+ if (UseBlock == OpBlock) {
+ // Special case of a phi node in the normal destination or the unwind
+ // destination.
+ Assert2(BB == NormalDest || !DT->isReachableFromEntry(UseBlock),
+ "Invoke result not available in the unwind destination!",
+ Op, &I);
+ } else {
+ Assert2(DT->dominates(II, UseBlock) ||
+ !DT->isReachableFromEntry(UseBlock),
+ "Invoke result does not dominate all uses!", Op, &I);
+ }
+ }
+
+ // PHI nodes are more difficult than other nodes because they actually
+ // "use" the value in the predecessor basic blocks they correspond to.
+ unsigned j = PHINode::getIncomingValueNumForOperand(i);
+ BasicBlock *PredBB = PN->getIncomingBlock(j);
+ Assert2(PredBB && (DT->dominates(OpBlock, PredBB) ||
+ !DT->isReachableFromEntry(PredBB)),
+ "Instruction does not dominate all uses!", Op, &I);
+}
+
/// verifyInstruction - Verify that an instruction is well formed.
///
void Verifier::visitInstruction(Instruction &I) {
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(I.getOperand(i))) {
Assert1(GV->getParent() == Mod, "Referencing global in another module!",
&I);
- } else if (Instruction *Op = dyn_cast<Instruction>(I.getOperand(i))) {
- BasicBlock *OpBlock = Op->getParent();
-
- // Check that a definition dominates all of its uses.
- if (InvokeInst *II = dyn_cast<InvokeInst>(Op)) {
- // Invoke results are only usable in the normal destination, not in the
- // exceptional destination.
- BasicBlock *NormalDest = II->getNormalDest();
-
- Assert2(NormalDest != II->getUnwindDest(),
- "No uses of invoke possible due to dominance structure!",
- Op, &I);
-
- // PHI nodes differ from other nodes because they actually "use" the
- // value in the predecessor basic blocks they correspond to.
- BasicBlock *UseBlock = BB;
- if (PHINode *PN = dyn_cast<PHINode>(&I)) {
- unsigned j = PHINode::getIncomingValueNumForOperand(i);
- UseBlock = PN->getIncomingBlock(j);
- }
- Assert2(UseBlock, "Invoke operand is PHI node with bad incoming-BB",
- Op, &I);
-
- if (isa<PHINode>(I) && UseBlock == OpBlock) {
- // Special case of a phi node in the normal destination or the unwind
- // destination.
- Assert2(BB == NormalDest || !DT->isReachableFromEntry(UseBlock),
- "Invoke result not available in the unwind destination!",
- Op, &I);
- } else {
- Assert2(DT->dominates(NormalDest, UseBlock) ||
- !DT->isReachableFromEntry(UseBlock),
- "Invoke result does not dominate all uses!", Op, &I);
-
- // If the normal successor of an invoke instruction has multiple
- // predecessors, then the normal edge from the invoke is critical,
- // so the invoke value can only be live if the destination block
- // dominates all of it's predecessors (other than the invoke).
- if (!NormalDest->getSinglePredecessor() &&
- DT->isReachableFromEntry(UseBlock))
- // If it is used by something non-phi, then the other case is that
- // 'NormalDest' dominates all of its predecessors other than the
- // invoke. In this case, the invoke value can still be used.
- for (pred_iterator PI = pred_begin(NormalDest),
- E = pred_end(NormalDest); PI != E; ++PI)
- if (*PI != II->getParent() && !DT->dominates(NormalDest, *PI) &&
- DT->isReachableFromEntry(*PI)) {
- CheckFailed("Invoke result does not dominate all uses!", Op,&I);
- return;
- }
- }
- } else if (PHINode *PN = dyn_cast<PHINode>(&I)) {
- // PHI nodes are more difficult than other nodes because they actually
- // "use" the value in the predecessor basic blocks they correspond to.
- unsigned j = PHINode::getIncomingValueNumForOperand(i);
- BasicBlock *PredBB = PN->getIncomingBlock(j);
- Assert2(PredBB && (DT->dominates(OpBlock, PredBB) ||
- !DT->isReachableFromEntry(PredBB)),
- "Instruction does not dominate all uses!", Op, &I);
- } else {
- if (OpBlock == BB) {
- // If they are in the same basic block, make sure that the definition
- // comes before the use.
- Assert2(InstsInThisBlock.count(Op) || !DT->isReachableFromEntry(BB),
- "Instruction does not dominate all uses!", Op, &I);
- }
-
- // Definition must dominate use unless use is unreachable!
- Assert2(InstsInThisBlock.count(Op) || DT->dominates(Op, &I) ||
- !DT->isReachableFromEntry(BB),
- "Instruction does not dominate all uses!", Op, &I);
- }
+ } else if (isa<Instruction>(I.getOperand(i))) {
+ verifyDominatesUse(I, i);
} else if (isa<InlineAsm>(I.getOperand(i))) {
Assert1((i + 1 == e && isa<CallInst>(I)) ||
(i + 3 == e && isa<InvokeInst>(I)),
"Cannot take the address of an inline asm!", &I);
}
}
+
+ if (MDNode *MD = I.getMetadata(LLVMContext::MD_fpmath)) {
+ Assert1(I.getType()->isFPOrFPVectorTy(),
+ "fpmath requires a floating point result!", &I);
+ Assert1(MD->getNumOperands() == 1, "fpmath takes one operand!", &I);
+ Value *Op0 = MD->getOperand(0);
+ if (ConstantFP *CFP0 = dyn_cast_or_null<ConstantFP>(Op0)) {
+ APFloat Accuracy = CFP0->getValueAPF();
+ Assert1(Accuracy.isNormal() && !Accuracy.isNegative(),
+ "fpmath accuracy not a positive number!", &I);
+ } else {
+ Assert1(false, "invalid fpmath accuracy!", &I);
+ }
+ }
+
+ MDNode *MD = I.getMetadata(LLVMContext::MD_range);
+ Assert1(!MD || isa<LoadInst>(I), "Ranges are only for loads!", &I);
+
InstsInThisBlock.insert(&I);
}
switch (ID) {
default:
break;
+ case Intrinsic::ctlz: // llvm.ctlz
+ case Intrinsic::cttz: // llvm.cttz
+ Assert1(isa<ConstantInt>(CI.getArgOperand(1)),
+ "is_zero_undef argument of bit counting intrinsics must be a "
+ "constant int", &CI);
+ break;
case Intrinsic::dbg_declare: { // llvm.dbg.declare
Assert1(CI.getArgOperand(0) && isa<MDNode>(CI.getArgOperand(0)),
"invalid llvm.dbg.declare intrinsic call 1", &CI);
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