1 //===-- Verifier.cpp - Implement the Module Verifier -------------*- C++ -*-==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the function verifier interface, that can be used for some
11 // sanity checking of input to the system.
13 // Note that this does not provide full `Java style' security and verifications,
14 // instead it just tries to ensure that code is well-formed.
16 // * Both of a binary operator's parameters are of the same type
17 // * Verify that the indices of mem access instructions match other operands
18 // * Verify that arithmetic and other things are only performed on first-class
19 // types. Verify that shifts & logicals only happen on integrals f.e.
20 // * All of the constants in a switch statement are of the correct type
21 // * The code is in valid SSA form
22 // * It should be illegal to put a label into any other type (like a structure)
23 // or to return one. [except constant arrays!]
24 // * Only phi nodes can be self referential: 'add i32 %0, %0 ; <int>:0' is bad
25 // * PHI nodes must have an entry for each predecessor, with no extras.
26 // * PHI nodes must be the first thing in a basic block, all grouped together
27 // * PHI nodes must have at least one entry
28 // * All basic blocks should only end with terminator insts, not contain them
29 // * The entry node to a function must not have predecessors
30 // * All Instructions must be embedded into a basic block
31 // * Functions cannot take a void-typed parameter
32 // * Verify that a function's argument list agrees with it's declared type.
33 // * It is illegal to specify a name for a void value.
34 // * It is illegal to have a internal global value with no initializer
35 // * It is illegal to have a ret instruction that returns a value that does not
36 // agree with the function return value type.
37 // * Function call argument types match the function prototype
38 // * All other things that are tested by asserts spread about the code...
40 //===----------------------------------------------------------------------===//
42 #include "llvm/Analysis/Verifier.h"
43 #include "llvm/CallingConv.h"
44 #include "llvm/Constants.h"
45 #include "llvm/DerivedTypes.h"
46 #include "llvm/InlineAsm.h"
47 #include "llvm/IntrinsicInst.h"
48 #include "llvm/Module.h"
49 #include "llvm/ModuleProvider.h"
50 #include "llvm/Pass.h"
51 #include "llvm/PassManager.h"
52 #include "llvm/Analysis/Dominators.h"
53 #include "llvm/Assembly/Writer.h"
54 #include "llvm/CodeGen/ValueTypes.h"
55 #include "llvm/Support/CallSite.h"
56 #include "llvm/Support/CFG.h"
57 #include "llvm/Support/InstVisitor.h"
58 #include "llvm/Support/Streams.h"
59 #include "llvm/ADT/SmallPtrSet.h"
60 #include "llvm/ADT/SmallVector.h"
61 #include "llvm/ADT/StringExtras.h"
62 #include "llvm/ADT/STLExtras.h"
63 #include "llvm/Support/Compiler.h"
69 namespace { // Anonymous namespace for class
70 struct VISIBILITY_HIDDEN PreVerifier : public FunctionPass {
71 static char ID; // Pass ID, replacement for typeid
73 PreVerifier() : FunctionPass(&ID) { }
75 // Check that the prerequisites for successful DominatorTree construction
77 bool runOnFunction(Function &F) {
80 for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
81 if (I->empty() || !I->back().isTerminator()) {
82 cerr << "Basic Block does not have terminator!\n";
83 WriteAsOperand(*cerr, I, true);
97 char PreVerifier::ID = 0;
98 static RegisterPass<PreVerifier>
99 PreVer("preverify", "Preliminary module verification");
100 static const PassInfo *const PreVerifyID = &PreVer;
103 struct VISIBILITY_HIDDEN
104 Verifier : public FunctionPass, InstVisitor<Verifier> {
105 static char ID; // Pass ID, replacement for typeid
106 bool Broken; // Is this module found to be broken?
107 bool RealPass; // Are we not being run by a PassManager?
108 VerifierFailureAction action;
109 // What to do if verification fails.
110 Module *Mod; // Module we are verifying right now
111 DominatorTree *DT; // Dominator Tree, caution can be null!
112 std::stringstream msgs; // A stringstream to collect messages
114 /// InstInThisBlock - when verifying a basic block, keep track of all of the
115 /// instructions we have seen so far. This allows us to do efficient
116 /// dominance checks for the case when an instruction has an operand that is
117 /// an instruction in the same block.
118 SmallPtrSet<Instruction*, 16> InstsInThisBlock;
122 Broken(false), RealPass(true), action(AbortProcessAction),
123 DT(0), msgs( std::ios::app | std::ios::out ) {}
124 explicit Verifier(VerifierFailureAction ctn)
126 Broken(false), RealPass(true), action(ctn), DT(0),
127 msgs( std::ios::app | std::ios::out ) {}
128 explicit Verifier(bool AB)
130 Broken(false), RealPass(true),
131 action( AB ? AbortProcessAction : PrintMessageAction), DT(0),
132 msgs( std::ios::app | std::ios::out ) {}
133 explicit Verifier(DominatorTree &dt)
135 Broken(false), RealPass(false), action(PrintMessageAction),
136 DT(&dt), msgs( std::ios::app | std::ios::out ) {}
139 bool doInitialization(Module &M) {
141 verifyTypeSymbolTable(M.getTypeSymbolTable());
143 // If this is a real pass, in a pass manager, we must abort before
144 // returning back to the pass manager, or else the pass manager may try to
145 // run other passes on the broken module.
147 return abortIfBroken();
151 bool runOnFunction(Function &F) {
152 // Get dominator information if we are being run by PassManager
153 if (RealPass) DT = &getAnalysis<DominatorTree>();
158 InstsInThisBlock.clear();
160 // If this is a real pass, in a pass manager, we must abort before
161 // returning back to the pass manager, or else the pass manager may try to
162 // run other passes on the broken module.
164 return abortIfBroken();
169 bool doFinalization(Module &M) {
170 // Scan through, checking all of the external function's linkage now...
171 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
172 visitGlobalValue(*I);
174 // Check to make sure function prototypes are okay.
175 if (I->isDeclaration()) visitFunction(*I);
178 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
180 visitGlobalVariable(*I);
182 for (Module::alias_iterator I = M.alias_begin(), E = M.alias_end();
184 visitGlobalAlias(*I);
186 // If the module is broken, abort at this time.
187 return abortIfBroken();
190 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
191 AU.setPreservesAll();
192 AU.addRequiredID(PreVerifyID);
194 AU.addRequired<DominatorTree>();
197 /// abortIfBroken - If the module is broken and we are supposed to abort on
198 /// this condition, do so.
200 bool abortIfBroken() {
201 if (!Broken) return false;
202 msgs << "Broken module found, ";
204 default: assert(0 && "Unknown action");
205 case AbortProcessAction:
206 msgs << "compilation aborted!\n";
209 case PrintMessageAction:
210 msgs << "verification continues.\n";
213 case ReturnStatusAction:
214 msgs << "compilation terminated.\n";
220 // Verification methods...
221 void verifyTypeSymbolTable(TypeSymbolTable &ST);
222 void visitGlobalValue(GlobalValue &GV);
223 void visitGlobalVariable(GlobalVariable &GV);
224 void visitGlobalAlias(GlobalAlias &GA);
225 void visitFunction(Function &F);
226 void visitBasicBlock(BasicBlock &BB);
227 using InstVisitor<Verifier>::visit;
229 void visit(Instruction &I);
231 void visitTruncInst(TruncInst &I);
232 void visitZExtInst(ZExtInst &I);
233 void visitSExtInst(SExtInst &I);
234 void visitFPTruncInst(FPTruncInst &I);
235 void visitFPExtInst(FPExtInst &I);
236 void visitFPToUIInst(FPToUIInst &I);
237 void visitFPToSIInst(FPToSIInst &I);
238 void visitUIToFPInst(UIToFPInst &I);
239 void visitSIToFPInst(SIToFPInst &I);
240 void visitIntToPtrInst(IntToPtrInst &I);
241 void visitPtrToIntInst(PtrToIntInst &I);
242 void visitBitCastInst(BitCastInst &I);
243 void visitPHINode(PHINode &PN);
244 void visitBinaryOperator(BinaryOperator &B);
245 void visitICmpInst(ICmpInst &IC);
246 void visitFCmpInst(FCmpInst &FC);
247 void visitExtractElementInst(ExtractElementInst &EI);
248 void visitInsertElementInst(InsertElementInst &EI);
249 void visitShuffleVectorInst(ShuffleVectorInst &EI);
250 void visitVAArgInst(VAArgInst &VAA) { visitInstruction(VAA); }
251 void visitCallInst(CallInst &CI);
252 void visitInvokeInst(InvokeInst &II);
253 void visitGetElementPtrInst(GetElementPtrInst &GEP);
254 void visitLoadInst(LoadInst &LI);
255 void visitStoreInst(StoreInst &SI);
256 void visitInstruction(Instruction &I);
257 void visitTerminatorInst(TerminatorInst &I);
258 void visitReturnInst(ReturnInst &RI);
259 void visitSwitchInst(SwitchInst &SI);
260 void visitSelectInst(SelectInst &SI);
261 void visitUserOp1(Instruction &I);
262 void visitUserOp2(Instruction &I) { visitUserOp1(I); }
263 void visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI);
264 void visitAllocationInst(AllocationInst &AI);
265 void visitExtractValueInst(ExtractValueInst &EVI);
266 void visitInsertValueInst(InsertValueInst &IVI);
268 void VerifyCallSite(CallSite CS);
269 void VerifyIntrinsicPrototype(Intrinsic::ID ID, Function *F,
270 unsigned Count, ...);
271 void VerifyAttrs(Attributes Attrs, const Type *Ty,
272 bool isReturnValue, const Value *V);
273 void VerifyFunctionAttrs(const FunctionType *FT, const AttrListPtr &Attrs,
276 void WriteValue(const Value *V) {
278 if (isa<Instruction>(V)) {
281 WriteAsOperand(msgs, V, true, Mod);
286 void WriteType(const Type *T) {
288 WriteTypeSymbolic(msgs, T, Mod );
292 // CheckFailed - A check failed, so print out the condition and the message
293 // that failed. This provides a nice place to put a breakpoint if you want
294 // to see why something is not correct.
295 void CheckFailed(const std::string &Message,
296 const Value *V1 = 0, const Value *V2 = 0,
297 const Value *V3 = 0, const Value *V4 = 0) {
298 msgs << Message << "\n";
306 void CheckFailed( const std::string& Message, const Value* V1,
307 const Type* T2, const Value* V3 = 0 ) {
308 msgs << Message << "\n";
315 } // End anonymous namespace
317 char Verifier::ID = 0;
318 static RegisterPass<Verifier> X("verify", "Module Verifier");
320 // Assert - We know that cond should be true, if not print an error message.
321 #define Assert(C, M) \
322 do { if (!(C)) { CheckFailed(M); return; } } while (0)
323 #define Assert1(C, M, V1) \
324 do { if (!(C)) { CheckFailed(M, V1); return; } } while (0)
325 #define Assert2(C, M, V1, V2) \
326 do { if (!(C)) { CheckFailed(M, V1, V2); return; } } while (0)
327 #define Assert3(C, M, V1, V2, V3) \
328 do { if (!(C)) { CheckFailed(M, V1, V2, V3); return; } } while (0)
329 #define Assert4(C, M, V1, V2, V3, V4) \
330 do { if (!(C)) { CheckFailed(M, V1, V2, V3, V4); return; } } while (0)
333 void Verifier::visit(Instruction &I) {
334 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
335 Assert1(I.getOperand(i) != 0, "Operand is null", &I);
336 InstVisitor<Verifier>::visit(I);
340 void Verifier::visitGlobalValue(GlobalValue &GV) {
341 Assert1(!GV.isDeclaration() ||
342 GV.hasExternalLinkage() ||
343 GV.hasDLLImportLinkage() ||
344 GV.hasExternalWeakLinkage() ||
345 GV.hasGhostLinkage() ||
346 (isa<GlobalAlias>(GV) &&
347 (GV.hasInternalLinkage() || GV.hasWeakLinkage())),
348 "Global is external, but doesn't have external or dllimport or weak linkage!",
351 Assert1(!GV.hasDLLImportLinkage() || GV.isDeclaration(),
352 "Global is marked as dllimport, but not external", &GV);
354 Assert1(!GV.hasAppendingLinkage() || isa<GlobalVariable>(GV),
355 "Only global variables can have appending linkage!", &GV);
357 if (GV.hasAppendingLinkage()) {
358 GlobalVariable &GVar = cast<GlobalVariable>(GV);
359 Assert1(isa<ArrayType>(GVar.getType()->getElementType()),
360 "Only global arrays can have appending linkage!", &GV);
364 void Verifier::visitGlobalVariable(GlobalVariable &GV) {
365 if (GV.hasInitializer()) {
366 Assert1(GV.getInitializer()->getType() == GV.getType()->getElementType(),
367 "Global variable initializer type does not match global "
368 "variable type!", &GV);
370 Assert1(GV.hasExternalLinkage() || GV.hasDLLImportLinkage() ||
371 GV.hasExternalWeakLinkage(),
372 "invalid linkage type for global declaration", &GV);
375 visitGlobalValue(GV);
378 void Verifier::visitGlobalAlias(GlobalAlias &GA) {
379 Assert1(!GA.getName().empty(),
380 "Alias name cannot be empty!", &GA);
381 Assert1(GA.hasExternalLinkage() || GA.hasInternalLinkage() ||
383 "Alias should have external or external weak linkage!", &GA);
384 Assert1(GA.getAliasee(),
385 "Aliasee cannot be NULL!", &GA);
386 Assert1(GA.getType() == GA.getAliasee()->getType(),
387 "Alias and aliasee types should match!", &GA);
389 if (!isa<GlobalValue>(GA.getAliasee())) {
390 const ConstantExpr *CE = dyn_cast<ConstantExpr>(GA.getAliasee());
391 Assert1(CE && CE->getOpcode() == Instruction::BitCast &&
392 isa<GlobalValue>(CE->getOperand(0)),
393 "Aliasee should be either GlobalValue or bitcast of GlobalValue",
397 const GlobalValue* Aliasee = GA.resolveAliasedGlobal(/*stopOnWeak*/ false);
399 "Aliasing chain should end with function or global variable", &GA);
401 visitGlobalValue(GA);
404 void Verifier::verifyTypeSymbolTable(TypeSymbolTable &ST) {
407 // VerifyAttrs - Check the given parameter attributes for an argument or return
408 // value of the specified type. The value V is printed in error messages.
409 void Verifier::VerifyAttrs(Attributes Attrs, const Type *Ty,
410 bool isReturnValue, const Value *V) {
411 if (Attrs == Attribute::None)
415 Attributes RetI = Attrs & Attribute::ParameterOnly;
416 Assert1(!RetI, "Attribute " + Attribute::getAsString(RetI) +
417 " does not apply to return values!", V);
419 Attributes ParmI = Attrs & Attribute::FunctionOnly;
420 Assert1(!ParmI, "Attribute " + Attribute::getAsString(ParmI) +
421 " only applies to return values!", V);
425 i < array_lengthof(Attribute::MutuallyIncompatible); ++i) {
426 Attributes MutI = Attrs & Attribute::MutuallyIncompatible[i];
427 Assert1(!(MutI & (MutI - 1)), "Attributes " +
428 Attribute::getAsString(MutI) + " are incompatible!", V);
431 Attributes TypeI = Attrs & Attribute::typeIncompatible(Ty);
432 Assert1(!TypeI, "Wrong type for attribute " +
433 Attribute::getAsString(TypeI), V);
435 Attributes ByValI = Attrs & Attribute::ByVal;
436 if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) {
437 Assert1(!ByValI || PTy->getElementType()->isSized(),
438 "Attribute " + Attribute::getAsString(ByValI) +
439 " does not support unsized types!", V);
442 "Attribute " + Attribute::getAsString(ByValI) +
443 " only applies to parameters with pointer type!", V);
447 // VerifyFunctionAttrs - Check parameter attributes against a function type.
448 // The value V is printed in error messages.
449 void Verifier::VerifyFunctionAttrs(const FunctionType *FT,
450 const AttrListPtr &Attrs,
455 bool SawNest = false;
457 for (unsigned i = 0, e = Attrs.getNumSlots(); i != e; ++i) {
458 const AttributeWithIndex &Attr = Attrs.getSlot(i);
462 Ty = FT->getReturnType();
463 else if (Attr.Index-1 < FT->getNumParams())
464 Ty = FT->getParamType(Attr.Index-1);
466 break; // VarArgs attributes, don't verify.
468 VerifyAttrs(Attr.Attrs, Ty, Attr.Index == 0, V);
470 if (Attr.Attrs & Attribute::Nest) {
471 Assert1(!SawNest, "More than one parameter has attribute nest!", V);
475 if (Attr.Attrs & Attribute::StructRet)
476 Assert1(Attr.Index == 1, "Attribute sret not on first parameter!", V);
479 Attributes FAttrs = Attrs.getFnAttributes();
480 Assert1(!(FAttrs & (!Attribute::FunctionOnly)),
481 "Attribute " + Attribute::getAsString(FAttrs) +
482 " does not apply to function!", V);
485 i < array_lengthof(Attribute::MutuallyIncompatible); ++i) {
486 Attributes MutI = FAttrs & Attribute::MutuallyIncompatible[i];
487 Assert1(!(MutI & (MutI - 1)), "Attributes " +
488 Attribute::getAsString(MutI) + " are incompatible!", V);
492 static bool VerifyAttributeCount(const AttrListPtr &Attrs, unsigned Params) {
496 unsigned LastSlot = Attrs.getNumSlots() - 1;
497 unsigned LastIndex = Attrs.getSlot(LastSlot).Index;
498 if (LastIndex <= Params
499 || (LastIndex == (unsigned)~0
500 && (LastSlot == 0 || Attrs.getSlot(LastSlot - 1).Index <= Params)))
505 // visitFunction - Verify that a function is ok.
507 void Verifier::visitFunction(Function &F) {
508 // Check function arguments.
509 const FunctionType *FT = F.getFunctionType();
510 unsigned NumArgs = F.arg_size();
512 Assert2(FT->getNumParams() == NumArgs,
513 "# formal arguments must match # of arguments for function type!",
515 Assert1(F.getReturnType()->isFirstClassType() ||
516 F.getReturnType() == Type::VoidTy ||
517 isa<StructType>(F.getReturnType()),
518 "Functions cannot return aggregate values!", &F);
520 Assert1(!F.hasStructRetAttr() || F.getReturnType() == Type::VoidTy,
521 "Invalid struct return type!", &F);
523 const AttrListPtr &Attrs = F.getAttributes();
525 Assert1(VerifyAttributeCount(Attrs, FT->getNumParams()),
526 "Attributes after last parameter!", &F);
528 // Check function attributes.
529 VerifyFunctionAttrs(FT, Attrs, &F);
531 // Check that this function meets the restrictions on this calling convention.
532 switch (F.getCallingConv()) {
537 case CallingConv::Fast:
538 case CallingConv::Cold:
539 case CallingConv::X86_FastCall:
540 Assert1(!F.isVarArg(),
541 "Varargs functions must have C calling conventions!", &F);
545 // Check that the argument values match the function type for this function...
547 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end();
549 Assert2(I->getType() == FT->getParamType(i),
550 "Argument value does not match function argument type!",
551 I, FT->getParamType(i));
552 Assert1(I->getType()->isFirstClassType(),
553 "Function arguments must have first-class types!", I);
556 if (F.isDeclaration()) {
557 Assert1(F.hasExternalLinkage() || F.hasDLLImportLinkage() ||
558 F.hasExternalWeakLinkage() || F.hasGhostLinkage(),
559 "invalid linkage type for function declaration", &F);
561 // Verify that this function (which has a body) is not named "llvm.*". It
562 // is not legal to define intrinsics.
563 if (F.getName().size() >= 5)
564 Assert1(F.getName().substr(0, 5) != "llvm.",
565 "llvm intrinsics cannot be defined!", &F);
567 // Check the entry node
568 BasicBlock *Entry = &F.getEntryBlock();
569 Assert1(pred_begin(Entry) == pred_end(Entry),
570 "Entry block to function must not have predecessors!", Entry);
575 // verifyBasicBlock - Verify that a basic block is well formed...
577 void Verifier::visitBasicBlock(BasicBlock &BB) {
578 InstsInThisBlock.clear();
580 // Ensure that basic blocks have terminators!
581 Assert1(BB.getTerminator(), "Basic Block does not have terminator!", &BB);
583 // Check constraints that this basic block imposes on all of the PHI nodes in
585 if (isa<PHINode>(BB.front())) {
586 SmallVector<BasicBlock*, 8> Preds(pred_begin(&BB), pred_end(&BB));
587 SmallVector<std::pair<BasicBlock*, Value*>, 8> Values;
588 std::sort(Preds.begin(), Preds.end());
590 for (BasicBlock::iterator I = BB.begin(); (PN = dyn_cast<PHINode>(I));++I) {
592 // Ensure that PHI nodes have at least one entry!
593 Assert1(PN->getNumIncomingValues() != 0,
594 "PHI nodes must have at least one entry. If the block is dead, "
595 "the PHI should be removed!", PN);
596 Assert1(PN->getNumIncomingValues() == Preds.size(),
597 "PHINode should have one entry for each predecessor of its "
598 "parent basic block!", PN);
600 // Get and sort all incoming values in the PHI node...
602 Values.reserve(PN->getNumIncomingValues());
603 for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
604 Values.push_back(std::make_pair(PN->getIncomingBlock(i),
605 PN->getIncomingValue(i)));
606 std::sort(Values.begin(), Values.end());
608 for (unsigned i = 0, e = Values.size(); i != e; ++i) {
609 // Check to make sure that if there is more than one entry for a
610 // particular basic block in this PHI node, that the incoming values are
613 Assert4(i == 0 || Values[i].first != Values[i-1].first ||
614 Values[i].second == Values[i-1].second,
615 "PHI node has multiple entries for the same basic block with "
616 "different incoming values!", PN, Values[i].first,
617 Values[i].second, Values[i-1].second);
619 // Check to make sure that the predecessors and PHI node entries are
621 Assert3(Values[i].first == Preds[i],
622 "PHI node entries do not match predecessors!", PN,
623 Values[i].first, Preds[i]);
629 void Verifier::visitTerminatorInst(TerminatorInst &I) {
630 // Ensure that terminators only exist at the end of the basic block.
631 Assert1(&I == I.getParent()->getTerminator(),
632 "Terminator found in the middle of a basic block!", I.getParent());
636 void Verifier::visitReturnInst(ReturnInst &RI) {
637 Function *F = RI.getParent()->getParent();
638 unsigned N = RI.getNumOperands();
639 if (F->getReturnType() == Type::VoidTy)
641 "Found return instr that returns void in Function of non-void "
642 "return type!", &RI, F->getReturnType());
643 else if (N == 1 && F->getReturnType() == RI.getOperand(0)->getType()) {
644 // Exactly one return value and it matches the return type. Good.
645 } else if (const StructType *STy = dyn_cast<StructType>(F->getReturnType())) {
646 // The return type is a struct; check for multiple return values.
647 Assert2(STy->getNumElements() == N,
648 "Incorrect number of return values in ret instruction!",
649 &RI, F->getReturnType());
650 for (unsigned i = 0; i != N; ++i)
651 Assert2(STy->getElementType(i) == RI.getOperand(i)->getType(),
652 "Function return type does not match operand "
653 "type of return inst!", &RI, F->getReturnType());
654 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(F->getReturnType())) {
655 // The return type is an array; check for multiple return values.
656 Assert2(ATy->getNumElements() == N,
657 "Incorrect number of return values in ret instruction!",
658 &RI, F->getReturnType());
659 for (unsigned i = 0; i != N; ++i)
660 Assert2(ATy->getElementType() == RI.getOperand(i)->getType(),
661 "Function return type does not match operand "
662 "type of return inst!", &RI, F->getReturnType());
664 CheckFailed("Function return type does not match operand "
665 "type of return inst!", &RI, F->getReturnType());
668 // Check to make sure that the return value has necessary properties for
670 visitTerminatorInst(RI);
673 void Verifier::visitSwitchInst(SwitchInst &SI) {
674 // Check to make sure that all of the constants in the switch instruction
675 // have the same type as the switched-on value.
676 const Type *SwitchTy = SI.getCondition()->getType();
677 for (unsigned i = 1, e = SI.getNumCases(); i != e; ++i)
678 Assert1(SI.getCaseValue(i)->getType() == SwitchTy,
679 "Switch constants must all be same type as switch value!", &SI);
681 visitTerminatorInst(SI);
684 void Verifier::visitSelectInst(SelectInst &SI) {
685 if (const VectorType* vt
686 = dyn_cast<VectorType>(SI.getCondition()->getType())) {
687 Assert1( vt->getElementType() == Type::Int1Ty,
688 "Select condition type must be vector of bool!", &SI);
689 if (const VectorType* val_vt
690 = dyn_cast<VectorType>(SI.getTrueValue()->getType())) {
691 Assert1( vt->getNumElements() == val_vt->getNumElements(),
692 "Select vector size != value vector size", &SI);
694 Assert1(0, "Vector select values must have vector types", &SI);
697 Assert1(SI.getCondition()->getType() == Type::Int1Ty,
698 "Select condition type must be bool!", &SI);
700 Assert1(SI.getTrueValue()->getType() == SI.getFalseValue()->getType(),
701 "Select values must have identical types!", &SI);
702 Assert1(SI.getTrueValue()->getType() == SI.getType(),
703 "Select values must have same type as select instruction!", &SI);
704 visitInstruction(SI);
708 /// visitUserOp1 - User defined operators shouldn't live beyond the lifetime of
709 /// a pass, if any exist, it's an error.
711 void Verifier::visitUserOp1(Instruction &I) {
712 Assert1(0, "User-defined operators should not live outside of a pass!", &I);
715 void Verifier::visitTruncInst(TruncInst &I) {
716 // Get the source and destination types
717 const Type *SrcTy = I.getOperand(0)->getType();
718 const Type *DestTy = I.getType();
720 // Get the size of the types in bits, we'll need this later
721 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
722 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
724 Assert1(SrcTy->isIntOrIntVector(), "Trunc only operates on integer", &I);
725 Assert1(DestTy->isIntOrIntVector(), "Trunc only produces integer", &I);
726 Assert1(SrcBitSize > DestBitSize,"DestTy too big for Trunc", &I);
731 void Verifier::visitZExtInst(ZExtInst &I) {
732 // Get the source and destination types
733 const Type *SrcTy = I.getOperand(0)->getType();
734 const Type *DestTy = I.getType();
736 // Get the size of the types in bits, we'll need this later
737 Assert1(SrcTy->isIntOrIntVector(), "ZExt only operates on integer", &I);
738 Assert1(DestTy->isIntOrIntVector(), "ZExt only produces an integer", &I);
739 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
740 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
742 Assert1(SrcBitSize < DestBitSize,"Type too small for ZExt", &I);
747 void Verifier::visitSExtInst(SExtInst &I) {
748 // Get the source and destination types
749 const Type *SrcTy = I.getOperand(0)->getType();
750 const Type *DestTy = I.getType();
752 // Get the size of the types in bits, we'll need this later
753 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
754 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
756 Assert1(SrcTy->isIntOrIntVector(), "SExt only operates on integer", &I);
757 Assert1(DestTy->isIntOrIntVector(), "SExt only produces an integer", &I);
758 Assert1(SrcBitSize < DestBitSize,"Type too small for SExt", &I);
763 void Verifier::visitFPTruncInst(FPTruncInst &I) {
764 // Get the source and destination types
765 const Type *SrcTy = I.getOperand(0)->getType();
766 const Type *DestTy = I.getType();
767 // Get the size of the types in bits, we'll need this later
768 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
769 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
771 Assert1(SrcTy->isFPOrFPVector(),"FPTrunc only operates on FP", &I);
772 Assert1(DestTy->isFPOrFPVector(),"FPTrunc only produces an FP", &I);
773 Assert1(SrcBitSize > DestBitSize,"DestTy too big for FPTrunc", &I);
778 void Verifier::visitFPExtInst(FPExtInst &I) {
779 // Get the source and destination types
780 const Type *SrcTy = I.getOperand(0)->getType();
781 const Type *DestTy = I.getType();
783 // Get the size of the types in bits, we'll need this later
784 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
785 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
787 Assert1(SrcTy->isFPOrFPVector(),"FPExt only operates on FP", &I);
788 Assert1(DestTy->isFPOrFPVector(),"FPExt only produces an FP", &I);
789 Assert1(SrcBitSize < DestBitSize,"DestTy too small for FPExt", &I);
794 void Verifier::visitUIToFPInst(UIToFPInst &I) {
795 // Get the source and destination types
796 const Type *SrcTy = I.getOperand(0)->getType();
797 const Type *DestTy = I.getType();
799 bool SrcVec = isa<VectorType>(SrcTy);
800 bool DstVec = isa<VectorType>(DestTy);
802 Assert1(SrcVec == DstVec,
803 "UIToFP source and dest must both be vector or scalar", &I);
804 Assert1(SrcTy->isIntOrIntVector(),
805 "UIToFP source must be integer or integer vector", &I);
806 Assert1(DestTy->isFPOrFPVector(),
807 "UIToFP result must be FP or FP vector", &I);
809 if (SrcVec && DstVec)
810 Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
811 cast<VectorType>(DestTy)->getNumElements(),
812 "UIToFP source and dest vector length mismatch", &I);
817 void Verifier::visitSIToFPInst(SIToFPInst &I) {
818 // Get the source and destination types
819 const Type *SrcTy = I.getOperand(0)->getType();
820 const Type *DestTy = I.getType();
822 bool SrcVec = SrcTy->getTypeID() == Type::VectorTyID;
823 bool DstVec = DestTy->getTypeID() == Type::VectorTyID;
825 Assert1(SrcVec == DstVec,
826 "SIToFP source and dest must both be vector or scalar", &I);
827 Assert1(SrcTy->isIntOrIntVector(),
828 "SIToFP source must be integer or integer vector", &I);
829 Assert1(DestTy->isFPOrFPVector(),
830 "SIToFP result must be FP or FP vector", &I);
832 if (SrcVec && DstVec)
833 Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
834 cast<VectorType>(DestTy)->getNumElements(),
835 "SIToFP source and dest vector length mismatch", &I);
840 void Verifier::visitFPToUIInst(FPToUIInst &I) {
841 // Get the source and destination types
842 const Type *SrcTy = I.getOperand(0)->getType();
843 const Type *DestTy = I.getType();
845 bool SrcVec = isa<VectorType>(SrcTy);
846 bool DstVec = isa<VectorType>(DestTy);
848 Assert1(SrcVec == DstVec,
849 "FPToUI source and dest must both be vector or scalar", &I);
850 Assert1(SrcTy->isFPOrFPVector(), "FPToUI source must be FP or FP vector", &I);
851 Assert1(DestTy->isIntOrIntVector(),
852 "FPToUI result must be integer or integer vector", &I);
854 if (SrcVec && DstVec)
855 Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
856 cast<VectorType>(DestTy)->getNumElements(),
857 "FPToUI source and dest vector length mismatch", &I);
862 void Verifier::visitFPToSIInst(FPToSIInst &I) {
863 // Get the source and destination types
864 const Type *SrcTy = I.getOperand(0)->getType();
865 const Type *DestTy = I.getType();
867 bool SrcVec = isa<VectorType>(SrcTy);
868 bool DstVec = isa<VectorType>(DestTy);
870 Assert1(SrcVec == DstVec,
871 "FPToSI source and dest must both be vector or scalar", &I);
872 Assert1(SrcTy->isFPOrFPVector(),
873 "FPToSI source must be FP or FP vector", &I);
874 Assert1(DestTy->isIntOrIntVector(),
875 "FPToSI result must be integer or integer vector", &I);
877 if (SrcVec && DstVec)
878 Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
879 cast<VectorType>(DestTy)->getNumElements(),
880 "FPToSI source and dest vector length mismatch", &I);
885 void Verifier::visitPtrToIntInst(PtrToIntInst &I) {
886 // Get the source and destination types
887 const Type *SrcTy = I.getOperand(0)->getType();
888 const Type *DestTy = I.getType();
890 Assert1(isa<PointerType>(SrcTy), "PtrToInt source must be pointer", &I);
891 Assert1(DestTy->isInteger(), "PtrToInt result must be integral", &I);
896 void Verifier::visitIntToPtrInst(IntToPtrInst &I) {
897 // Get the source and destination types
898 const Type *SrcTy = I.getOperand(0)->getType();
899 const Type *DestTy = I.getType();
901 Assert1(SrcTy->isInteger(), "IntToPtr source must be an integral", &I);
902 Assert1(isa<PointerType>(DestTy), "IntToPtr result must be a pointer",&I);
907 void Verifier::visitBitCastInst(BitCastInst &I) {
908 // Get the source and destination types
909 const Type *SrcTy = I.getOperand(0)->getType();
910 const Type *DestTy = I.getType();
912 // Get the size of the types in bits, we'll need this later
913 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
914 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
916 // BitCast implies a no-op cast of type only. No bits change.
917 // However, you can't cast pointers to anything but pointers.
918 Assert1(isa<PointerType>(DestTy) == isa<PointerType>(DestTy),
919 "Bitcast requires both operands to be pointer or neither", &I);
920 Assert1(SrcBitSize == DestBitSize, "Bitcast requies types of same width", &I);
922 // Disallow aggregates.
923 Assert1(!SrcTy->isAggregateType(),
924 "Bitcast operand must not be aggregate", &I);
925 Assert1(!DestTy->isAggregateType(),
926 "Bitcast type must not be aggregate", &I);
931 /// visitPHINode - Ensure that a PHI node is well formed.
933 void Verifier::visitPHINode(PHINode &PN) {
934 // Ensure that the PHI nodes are all grouped together at the top of the block.
935 // This can be tested by checking whether the instruction before this is
936 // either nonexistent (because this is begin()) or is a PHI node. If not,
937 // then there is some other instruction before a PHI.
938 Assert2(&PN == &PN.getParent()->front() ||
939 isa<PHINode>(--BasicBlock::iterator(&PN)),
940 "PHI nodes not grouped at top of basic block!",
941 &PN, PN.getParent());
943 // Check that all of the operands of the PHI node have the same type as the
945 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i)
946 Assert1(PN.getType() == PN.getIncomingValue(i)->getType(),
947 "PHI node operands are not the same type as the result!", &PN);
949 // All other PHI node constraints are checked in the visitBasicBlock method.
951 visitInstruction(PN);
954 void Verifier::VerifyCallSite(CallSite CS) {
955 Instruction *I = CS.getInstruction();
957 Assert1(isa<PointerType>(CS.getCalledValue()->getType()),
958 "Called function must be a pointer!", I);
959 const PointerType *FPTy = cast<PointerType>(CS.getCalledValue()->getType());
960 Assert1(isa<FunctionType>(FPTy->getElementType()),
961 "Called function is not pointer to function type!", I);
963 const FunctionType *FTy = cast<FunctionType>(FPTy->getElementType());
965 // Verify that the correct number of arguments are being passed
967 Assert1(CS.arg_size() >= FTy->getNumParams(),
968 "Called function requires more parameters than were provided!",I);
970 Assert1(CS.arg_size() == FTy->getNumParams(),
971 "Incorrect number of arguments passed to called function!", I);
973 // Verify that all arguments to the call match the function type...
974 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
975 Assert3(CS.getArgument(i)->getType() == FTy->getParamType(i),
976 "Call parameter type does not match function signature!",
977 CS.getArgument(i), FTy->getParamType(i), I);
979 const AttrListPtr &Attrs = CS.getAttributes();
981 Assert1(VerifyAttributeCount(Attrs, CS.arg_size()),
982 "Attributes after last parameter!", I);
984 // Verify call attributes.
985 VerifyFunctionAttrs(FTy, Attrs, I);
988 // Check attributes on the varargs part.
989 for (unsigned Idx = 1 + FTy->getNumParams(); Idx <= CS.arg_size(); ++Idx) {
990 Attributes Attr = Attrs.getParamAttributes(Idx);
992 VerifyAttrs(Attr, CS.getArgument(Idx-1)->getType(), false, I);
994 Attributes VArgI = Attr & Attribute::VarArgsIncompatible;
995 Assert1(!VArgI, "Attribute " + Attribute::getAsString(VArgI) +
996 " cannot be used for vararg call arguments!", I);
999 visitInstruction(*I);
1002 void Verifier::visitCallInst(CallInst &CI) {
1003 VerifyCallSite(&CI);
1005 if (Function *F = CI.getCalledFunction()) {
1006 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
1007 visitIntrinsicFunctionCall(ID, CI);
1011 void Verifier::visitInvokeInst(InvokeInst &II) {
1012 VerifyCallSite(&II);
1015 /// visitBinaryOperator - Check that both arguments to the binary operator are
1016 /// of the same type!
1018 void Verifier::visitBinaryOperator(BinaryOperator &B) {
1019 Assert1(B.getOperand(0)->getType() == B.getOperand(1)->getType(),
1020 "Both operands to a binary operator are not of the same type!", &B);
1022 switch (B.getOpcode()) {
1023 // Check that logical operators are only used with integral operands.
1024 case Instruction::And:
1025 case Instruction::Or:
1026 case Instruction::Xor:
1027 Assert1(B.getType()->isInteger() ||
1028 (isa<VectorType>(B.getType()) &&
1029 cast<VectorType>(B.getType())->getElementType()->isInteger()),
1030 "Logical operators only work with integral types!", &B);
1031 Assert1(B.getType() == B.getOperand(0)->getType(),
1032 "Logical operators must have same type for operands and result!",
1035 case Instruction::Shl:
1036 case Instruction::LShr:
1037 case Instruction::AShr:
1038 Assert1(B.getType()->isInteger() ||
1039 (isa<VectorType>(B.getType()) &&
1040 cast<VectorType>(B.getType())->getElementType()->isInteger()),
1041 "Shifts only work with integral types!", &B);
1042 Assert1(B.getType() == B.getOperand(0)->getType(),
1043 "Shift return type must be same as operands!", &B);
1046 // Arithmetic operators only work on integer or fp values
1047 Assert1(B.getType() == B.getOperand(0)->getType(),
1048 "Arithmetic operators must have same type for operands and result!",
1050 Assert1(B.getType()->isInteger() || B.getType()->isFloatingPoint() ||
1051 isa<VectorType>(B.getType()),
1052 "Arithmetic operators must have integer, fp, or vector type!", &B);
1056 visitInstruction(B);
1059 void Verifier::visitICmpInst(ICmpInst& IC) {
1060 // Check that the operands are the same type
1061 const Type* Op0Ty = IC.getOperand(0)->getType();
1062 const Type* Op1Ty = IC.getOperand(1)->getType();
1063 Assert1(Op0Ty == Op1Ty,
1064 "Both operands to ICmp instruction are not of the same type!", &IC);
1065 // Check that the operands are the right type
1066 Assert1(Op0Ty->isIntOrIntVector() || isa<PointerType>(Op0Ty),
1067 "Invalid operand types for ICmp instruction", &IC);
1068 visitInstruction(IC);
1071 void Verifier::visitFCmpInst(FCmpInst& FC) {
1072 // Check that the operands are the same type
1073 const Type* Op0Ty = FC.getOperand(0)->getType();
1074 const Type* Op1Ty = FC.getOperand(1)->getType();
1075 Assert1(Op0Ty == Op1Ty,
1076 "Both operands to FCmp instruction are not of the same type!", &FC);
1077 // Check that the operands are the right type
1078 Assert1(Op0Ty->isFPOrFPVector(),
1079 "Invalid operand types for FCmp instruction", &FC);
1080 visitInstruction(FC);
1083 void Verifier::visitExtractElementInst(ExtractElementInst &EI) {
1084 Assert1(ExtractElementInst::isValidOperands(EI.getOperand(0),
1086 "Invalid extractelement operands!", &EI);
1087 visitInstruction(EI);
1090 void Verifier::visitInsertElementInst(InsertElementInst &IE) {
1091 Assert1(InsertElementInst::isValidOperands(IE.getOperand(0),
1094 "Invalid insertelement operands!", &IE);
1095 visitInstruction(IE);
1098 void Verifier::visitShuffleVectorInst(ShuffleVectorInst &SV) {
1099 Assert1(ShuffleVectorInst::isValidOperands(SV.getOperand(0), SV.getOperand(1),
1101 "Invalid shufflevector operands!", &SV);
1102 Assert1(SV.getType() == SV.getOperand(0)->getType(),
1103 "Result of shufflevector must match first operand type!", &SV);
1105 // Check to see if Mask is valid.
1106 if (const ConstantVector *MV = dyn_cast<ConstantVector>(SV.getOperand(2))) {
1107 for (unsigned i = 0, e = MV->getNumOperands(); i != e; ++i) {
1108 if (ConstantInt* CI = dyn_cast<ConstantInt>(MV->getOperand(i))) {
1109 Assert1(!CI->uge(MV->getNumOperands()*2),
1110 "Invalid shufflevector shuffle mask!", &SV);
1112 Assert1(isa<UndefValue>(MV->getOperand(i)),
1113 "Invalid shufflevector shuffle mask!", &SV);
1117 Assert1(isa<UndefValue>(SV.getOperand(2)) ||
1118 isa<ConstantAggregateZero>(SV.getOperand(2)),
1119 "Invalid shufflevector shuffle mask!", &SV);
1122 visitInstruction(SV);
1125 void Verifier::visitGetElementPtrInst(GetElementPtrInst &GEP) {
1126 SmallVector<Value*, 16> Idxs(GEP.idx_begin(), GEP.idx_end());
1128 GetElementPtrInst::getIndexedType(GEP.getOperand(0)->getType(),
1129 Idxs.begin(), Idxs.end());
1130 Assert1(ElTy, "Invalid indices for GEP pointer type!", &GEP);
1131 Assert2(isa<PointerType>(GEP.getType()) &&
1132 cast<PointerType>(GEP.getType())->getElementType() == ElTy,
1133 "GEP is not of right type for indices!", &GEP, ElTy);
1134 visitInstruction(GEP);
1137 void Verifier::visitLoadInst(LoadInst &LI) {
1139 cast<PointerType>(LI.getOperand(0)->getType())->getElementType();
1140 Assert2(ElTy == LI.getType(),
1141 "Load result type does not match pointer operand type!", &LI, ElTy);
1142 visitInstruction(LI);
1145 void Verifier::visitStoreInst(StoreInst &SI) {
1147 cast<PointerType>(SI.getOperand(1)->getType())->getElementType();
1148 Assert2(ElTy == SI.getOperand(0)->getType(),
1149 "Stored value type does not match pointer operand type!", &SI, ElTy);
1150 visitInstruction(SI);
1153 void Verifier::visitAllocationInst(AllocationInst &AI) {
1154 const PointerType *PTy = AI.getType();
1155 Assert1(PTy->getAddressSpace() == 0,
1156 "Allocation instruction pointer not in the generic address space!",
1158 Assert1(PTy->getElementType()->isSized(), "Cannot allocate unsized type",
1160 visitInstruction(AI);
1163 void Verifier::visitExtractValueInst(ExtractValueInst &EVI) {
1164 Assert1(ExtractValueInst::getIndexedType(EVI.getAggregateOperand()->getType(),
1165 EVI.idx_begin(), EVI.idx_end()) ==
1167 "Invalid ExtractValueInst operands!", &EVI);
1169 visitInstruction(EVI);
1172 void Verifier::visitInsertValueInst(InsertValueInst &IVI) {
1173 Assert1(ExtractValueInst::getIndexedType(IVI.getAggregateOperand()->getType(),
1174 IVI.idx_begin(), IVI.idx_end()) ==
1175 IVI.getOperand(1)->getType(),
1176 "Invalid InsertValueInst operands!", &IVI);
1178 visitInstruction(IVI);
1181 /// verifyInstruction - Verify that an instruction is well formed.
1183 void Verifier::visitInstruction(Instruction &I) {
1184 BasicBlock *BB = I.getParent();
1185 Assert1(BB, "Instruction not embedded in basic block!", &I);
1187 if (!isa<PHINode>(I)) { // Check that non-phi nodes are not self referential
1188 for (Value::use_iterator UI = I.use_begin(), UE = I.use_end();
1190 Assert1(*UI != (User*)&I ||
1191 !DT->dominates(&BB->getParent()->getEntryBlock(), BB),
1192 "Only PHI nodes may reference their own value!", &I);
1195 // Verify that if this is a terminator that it is at the end of the block.
1196 if (isa<TerminatorInst>(I))
1197 Assert1(BB->getTerminator() == &I, "Terminator not at end of block!", &I);
1200 // Check that void typed values don't have names
1201 Assert1(I.getType() != Type::VoidTy || !I.hasName(),
1202 "Instruction has a name, but provides a void value!", &I);
1204 // Check that the return value of the instruction is either void or a legal
1206 Assert1(I.getType() == Type::VoidTy || I.getType()->isFirstClassType()
1207 || ((isa<CallInst>(I) || isa<InvokeInst>(I))
1208 && isa<StructType>(I.getType())),
1209 "Instruction returns a non-scalar type!", &I);
1211 // Check that all uses of the instruction, if they are instructions
1212 // themselves, actually have parent basic blocks. If the use is not an
1213 // instruction, it is an error!
1214 for (User::use_iterator UI = I.use_begin(), UE = I.use_end();
1216 Assert1(isa<Instruction>(*UI), "Use of instruction is not an instruction!",
1218 Instruction *Used = cast<Instruction>(*UI);
1219 Assert2(Used->getParent() != 0, "Instruction referencing instruction not"
1220 " embeded in a basic block!", &I, Used);
1223 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
1224 Assert1(I.getOperand(i) != 0, "Instruction has null operand!", &I);
1226 // Check to make sure that only first-class-values are operands to
1228 if (!I.getOperand(i)->getType()->isFirstClassType()) {
1229 Assert1(0, "Instruction operands must be first-class values!", &I);
1232 if (Function *F = dyn_cast<Function>(I.getOperand(i))) {
1233 // Check to make sure that the "address of" an intrinsic function is never
1235 Assert1(!F->isIntrinsic() || (i == 0 && isa<CallInst>(I)),
1236 "Cannot take the address of an intrinsic!", &I);
1237 Assert1(F->getParent() == Mod, "Referencing function in another module!",
1239 } else if (BasicBlock *OpBB = dyn_cast<BasicBlock>(I.getOperand(i))) {
1240 Assert1(OpBB->getParent() == BB->getParent(),
1241 "Referring to a basic block in another function!", &I);
1242 } else if (Argument *OpArg = dyn_cast<Argument>(I.getOperand(i))) {
1243 Assert1(OpArg->getParent() == BB->getParent(),
1244 "Referring to an argument in another function!", &I);
1245 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(I.getOperand(i))) {
1246 Assert1(GV->getParent() == Mod, "Referencing global in another module!",
1248 } else if (Instruction *Op = dyn_cast<Instruction>(I.getOperand(i))) {
1249 BasicBlock *OpBlock = Op->getParent();
1251 // Check that a definition dominates all of its uses.
1252 if (!isa<PHINode>(I)) {
1253 // Invoke results are only usable in the normal destination, not in the
1254 // exceptional destination.
1255 if (InvokeInst *II = dyn_cast<InvokeInst>(Op)) {
1256 OpBlock = II->getNormalDest();
1258 Assert2(OpBlock != II->getUnwindDest(),
1259 "No uses of invoke possible due to dominance structure!",
1262 // If the normal successor of an invoke instruction has multiple
1263 // predecessors, then the normal edge from the invoke is critical, so
1264 // the invoke value can only be live if the destination block
1265 // dominates all of it's predecessors (other than the invoke) or if
1266 // the invoke value is only used by a phi in the successor.
1267 if (!OpBlock->getSinglePredecessor() &&
1268 DT->dominates(&BB->getParent()->getEntryBlock(), BB)) {
1269 // The first case we allow is if the use is a PHI operand in the
1270 // normal block, and if that PHI operand corresponds to the invoke's
1273 if (PHINode *PN = dyn_cast<PHINode>(&I))
1274 if (PN->getParent() == OpBlock &&
1275 PN->getIncomingBlock(i/2) == Op->getParent())
1278 // If it is used by something non-phi, then the other case is that
1279 // 'OpBlock' dominates all of its predecessors other than the
1280 // invoke. In this case, the invoke value can still be used.
1283 for (pred_iterator PI = pred_begin(OpBlock),
1284 E = pred_end(OpBlock); PI != E; ++PI) {
1285 if (*PI != II->getParent() && !DT->dominates(OpBlock, *PI)) {
1292 "Invoke value defined on critical edge but not dead!", &I,
1295 } else if (OpBlock == BB) {
1296 // If they are in the same basic block, make sure that the definition
1297 // comes before the use.
1298 Assert2(InstsInThisBlock.count(Op) ||
1299 !DT->dominates(&BB->getParent()->getEntryBlock(), BB),
1300 "Instruction does not dominate all uses!", Op, &I);
1303 // Definition must dominate use unless use is unreachable!
1304 Assert2(InstsInThisBlock.count(Op) || DT->dominates(Op, &I) ||
1305 !DT->dominates(&BB->getParent()->getEntryBlock(), BB),
1306 "Instruction does not dominate all uses!", Op, &I);
1308 // PHI nodes are more difficult than other nodes because they actually
1309 // "use" the value in the predecessor basic blocks they correspond to.
1310 BasicBlock *PredBB = cast<BasicBlock>(I.getOperand(i+1));
1311 Assert2(DT->dominates(OpBlock, PredBB) ||
1312 !DT->dominates(&BB->getParent()->getEntryBlock(), PredBB),
1313 "Instruction does not dominate all uses!", Op, &I);
1315 } else if (isa<InlineAsm>(I.getOperand(i))) {
1316 Assert1(i == 0 && (isa<CallInst>(I) || isa<InvokeInst>(I)),
1317 "Cannot take the address of an inline asm!", &I);
1320 InstsInThisBlock.insert(&I);
1323 /// visitIntrinsicFunction - Allow intrinsics to be verified in different ways.
1325 void Verifier::visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI) {
1326 Function *IF = CI.getCalledFunction();
1327 Assert1(IF->isDeclaration(), "Intrinsic functions should never be defined!",
1330 #define GET_INTRINSIC_VERIFIER
1331 #include "llvm/Intrinsics.gen"
1332 #undef GET_INTRINSIC_VERIFIER
1337 case Intrinsic::memcpy_i32:
1338 case Intrinsic::memcpy_i64:
1339 case Intrinsic::memmove_i32:
1340 case Intrinsic::memmove_i64:
1341 case Intrinsic::memset_i32:
1342 case Intrinsic::memset_i64:
1343 Assert1(isa<ConstantInt>(CI.getOperand(4)),
1344 "alignment argument of memory intrinsics must be a constant int",
1347 case Intrinsic::gcroot:
1348 case Intrinsic::gcwrite:
1349 case Intrinsic::gcread:
1350 if (ID == Intrinsic::gcroot) {
1351 Assert1(isa<AllocaInst>(CI.getOperand(1)->stripPointerCasts()),
1352 "llvm.gcroot parameter #1 must be an alloca.", &CI);
1353 Assert1(isa<Constant>(CI.getOperand(2)),
1354 "llvm.gcroot parameter #2 must be a constant.", &CI);
1357 Assert1(CI.getParent()->getParent()->hasGC(),
1358 "Enclosing function does not use GC.", &CI);
1360 case Intrinsic::init_trampoline:
1361 Assert1(isa<Function>(CI.getOperand(2)->stripPointerCasts()),
1362 "llvm.init_trampoline parameter #2 must resolve to a function.",
1368 /// VerifyIntrinsicPrototype - TableGen emits calls to this function into
1369 /// Intrinsics.gen. This implements a little state machine that verifies the
1370 /// prototype of intrinsics.
1371 void Verifier::VerifyIntrinsicPrototype(Intrinsic::ID ID,
1373 unsigned Count, ...) {
1375 va_start(VA, Count);
1376 const FunctionType *FTy = F->getFunctionType();
1378 // For overloaded intrinsics, the Suffix of the function name must match the
1379 // types of the arguments. This variable keeps track of the expected
1380 // suffix, to be checked at the end.
1383 if (FTy->getNumParams() + FTy->isVarArg() != Count - 1) {
1384 CheckFailed("Intrinsic prototype has incorrect number of arguments!", F);
1388 // Note that "arg#0" is the return type.
1389 for (unsigned ArgNo = 0; ArgNo < Count; ++ArgNo) {
1390 int VT = va_arg(VA, int); // An MVT::SimpleValueType when non-negative.
1392 if (VT == MVT::isVoid && ArgNo > 0) {
1393 if (!FTy->isVarArg())
1394 CheckFailed("Intrinsic prototype has no '...'!", F);
1400 Ty = FTy->getReturnType();
1402 Ty = FTy->getParamType(ArgNo-1);
1404 unsigned NumElts = 0;
1405 const Type *EltTy = Ty;
1406 if (const VectorType *VTy = dyn_cast<VectorType>(Ty)) {
1407 EltTy = VTy->getElementType();
1408 NumElts = VTy->getNumElements();
1414 if (Ty != FTy->getReturnType()) {
1415 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " does not "
1416 "match return type.", F);
1420 if (Ty != FTy->getParamType(Match-1)) {
1421 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " does not "
1422 "match parameter %" + utostr(Match-1) + ".", F);
1426 } else if (VT == MVT::iAny) {
1427 if (!EltTy->isInteger()) {
1429 CheckFailed("Intrinsic result type is not "
1430 "an integer type.", F);
1432 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is not "
1433 "an integer type.", F);
1436 unsigned GotBits = cast<IntegerType>(EltTy)->getBitWidth();
1439 Suffix += "v" + utostr(NumElts);
1440 Suffix += "i" + utostr(GotBits);;
1441 // Check some constraints on various intrinsics.
1443 default: break; // Not everything needs to be checked.
1444 case Intrinsic::bswap:
1445 if (GotBits < 16 || GotBits % 16 != 0)
1446 CheckFailed("Intrinsic requires even byte width argument", F);
1449 } else if (VT == MVT::fAny) {
1450 if (!EltTy->isFloatingPoint()) {
1452 CheckFailed("Intrinsic result type is not "
1453 "a floating-point type.", F);
1455 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is not "
1456 "a floating-point type.", F);
1461 Suffix += "v" + utostr(NumElts);
1462 Suffix += MVT::getMVT(EltTy).getMVTString();
1463 } else if (VT == MVT::iPTR) {
1464 if (!isa<PointerType>(Ty)) {
1466 CheckFailed("Intrinsic result type is not a "
1467 "pointer and a pointer is required.", F);
1469 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is not a "
1470 "pointer and a pointer is required.", F);
1472 } else if (VT == MVT::iPTRAny) {
1473 // Outside of TableGen, we don't distinguish iPTRAny (to any address
1474 // space) and iPTR. In the verifier, we can not distinguish which case
1475 // we have so allow either case to be legal.
1476 if (const PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
1477 Suffix += ".p" + utostr(PTyp->getAddressSpace()) +
1478 MVT::getMVT(PTyp->getElementType()).getMVTString();
1481 CheckFailed("Intrinsic result type is not a "
1482 "pointer and a pointer is required.", F);
1484 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is not a "
1485 "pointer and a pointer is required.", F);
1488 } else if (MVT((MVT::SimpleValueType)VT).isVector()) {
1489 MVT VVT = MVT((MVT::SimpleValueType)VT);
1490 // If this is a vector argument, verify the number and type of elements.
1491 if (VVT.getVectorElementType() != MVT::getMVT(EltTy)) {
1492 CheckFailed("Intrinsic prototype has incorrect vector element type!",
1496 if (VVT.getVectorNumElements() != NumElts) {
1497 CheckFailed("Intrinsic prototype has incorrect number of "
1498 "vector elements!",F);
1501 } else if (MVT((MVT::SimpleValueType)VT).getTypeForMVT() != EltTy) {
1503 CheckFailed("Intrinsic prototype has incorrect result type!", F);
1505 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is wrong!",F);
1507 } else if (EltTy != Ty) {
1509 CheckFailed("Intrinsic result type is vector "
1510 "and a scalar is required.", F);
1512 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is vector "
1513 "and a scalar is required.", F);
1519 // For intrinsics without pointer arguments, if we computed a Suffix then the
1520 // intrinsic is overloaded and we need to make sure that the name of the
1521 // function is correct. We add the suffix to the name of the intrinsic and
1522 // compare against the given function name. If they are not the same, the
1523 // function name is invalid. This ensures that overloading of intrinsics
1524 // uses a sane and consistent naming convention. Note that intrinsics with
1525 // pointer argument may or may not be overloaded so we will check assuming it
1526 // has a suffix and not.
1527 if (!Suffix.empty()) {
1528 std::string Name(Intrinsic::getName(ID));
1529 if (Name + Suffix != F->getName()) {
1530 CheckFailed("Overloaded intrinsic has incorrect suffix: '" +
1531 F->getName().substr(Name.length()) + "'. It should be '" +
1536 // Check parameter attributes.
1537 Assert1(F->getAttributes() == Intrinsic::getAttributes(ID),
1538 "Intrinsic has wrong parameter attributes!", F);
1542 //===----------------------------------------------------------------------===//
1543 // Implement the public interfaces to this file...
1544 //===----------------------------------------------------------------------===//
1546 FunctionPass *llvm::createVerifierPass(VerifierFailureAction action) {
1547 return new Verifier(action);
1551 // verifyFunction - Create
1552 bool llvm::verifyFunction(const Function &f, VerifierFailureAction action) {
1553 Function &F = const_cast<Function&>(f);
1554 assert(!F.isDeclaration() && "Cannot verify external functions");
1556 ExistingModuleProvider MP(F.getParent());
1557 FunctionPassManager FPM(&MP);
1558 Verifier *V = new Verifier(action);
1565 /// verifyModule - Check a module for errors, printing messages on stderr.
1566 /// Return true if the module is corrupt.
1568 bool llvm::verifyModule(const Module &M, VerifierFailureAction action,
1569 std::string *ErrorInfo) {
1571 Verifier *V = new Verifier(action);
1573 PM.run(const_cast<Module&>(M));
1575 if (ErrorInfo && V->Broken)
1576 *ErrorInfo = V->msgs.str();