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((intptr_t)&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;
121 : FunctionPass((intptr_t)&ID),
122 Broken(false), RealPass(true), action(AbortProcessAction),
123 DT(0), msgs( std::ios::app | std::ios::out ) {}
124 explicit Verifier(VerifierFailureAction ctn)
125 : FunctionPass((intptr_t)&ID),
126 Broken(false), RealPass(true), action(ctn), DT(0),
127 msgs( std::ios::app | std::ios::out ) {}
128 explicit Verifier(bool AB)
129 : FunctionPass((intptr_t)&ID),
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)
134 : FunctionPass((intptr_t)&ID),
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() {
202 msgs << "Broken module found, ";
204 case AbortProcessAction:
205 msgs << "compilation aborted!\n";
208 case PrintMessageAction:
209 msgs << "verification continues.\n";
212 case ReturnStatusAction:
213 msgs << "compilation terminated.\n";
221 // Verification methods...
222 void verifyTypeSymbolTable(TypeSymbolTable &ST);
223 void visitGlobalValue(GlobalValue &GV);
224 void visitGlobalVariable(GlobalVariable &GV);
225 void visitGlobalAlias(GlobalAlias &GA);
226 void visitFunction(Function &F);
227 void visitBasicBlock(BasicBlock &BB);
228 void visitTruncInst(TruncInst &I);
229 void visitZExtInst(ZExtInst &I);
230 void visitSExtInst(SExtInst &I);
231 void visitFPTruncInst(FPTruncInst &I);
232 void visitFPExtInst(FPExtInst &I);
233 void visitFPToUIInst(FPToUIInst &I);
234 void visitFPToSIInst(FPToSIInst &I);
235 void visitUIToFPInst(UIToFPInst &I);
236 void visitSIToFPInst(SIToFPInst &I);
237 void visitIntToPtrInst(IntToPtrInst &I);
238 void visitPtrToIntInst(PtrToIntInst &I);
239 void visitBitCastInst(BitCastInst &I);
240 void visitPHINode(PHINode &PN);
241 void visitBinaryOperator(BinaryOperator &B);
242 void visitICmpInst(ICmpInst &IC);
243 void visitFCmpInst(FCmpInst &FC);
244 void visitExtractElementInst(ExtractElementInst &EI);
245 void visitInsertElementInst(InsertElementInst &EI);
246 void visitShuffleVectorInst(ShuffleVectorInst &EI);
247 void visitVAArgInst(VAArgInst &VAA) { visitInstruction(VAA); }
248 void visitCallInst(CallInst &CI);
249 void visitInvokeInst(InvokeInst &II);
250 void visitGetElementPtrInst(GetElementPtrInst &GEP);
251 void visitLoadInst(LoadInst &LI);
252 void visitStoreInst(StoreInst &SI);
253 void visitInstruction(Instruction &I);
254 void visitTerminatorInst(TerminatorInst &I);
255 void visitReturnInst(ReturnInst &RI);
256 void visitSwitchInst(SwitchInst &SI);
257 void visitSelectInst(SelectInst &SI);
258 void visitUserOp1(Instruction &I);
259 void visitUserOp2(Instruction &I) { visitUserOp1(I); }
260 void visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI);
261 void visitAllocationInst(AllocationInst &AI);
262 void visitExtractValueInst(ExtractValueInst &EVI);
263 void visitInsertValueInst(InsertValueInst &IVI);
265 void VerifyCallSite(CallSite CS);
266 void VerifyIntrinsicPrototype(Intrinsic::ID ID, Function *F,
267 unsigned Count, ...);
268 void VerifyAttrs(ParameterAttributes Attrs, const Type *Ty,
269 bool isReturnValue, const Value *V);
270 void VerifyFunctionAttrs(const FunctionType *FT, const PAListPtr &Attrs,
273 void WriteValue(const Value *V) {
275 if (isa<Instruction>(V)) {
278 WriteAsOperand(msgs, V, true, Mod);
283 void WriteType(const Type *T) {
285 WriteTypeSymbolic(msgs, T, Mod );
289 // CheckFailed - A check failed, so print out the condition and the message
290 // that failed. This provides a nice place to put a breakpoint if you want
291 // to see why something is not correct.
292 void CheckFailed(const std::string &Message,
293 const Value *V1 = 0, const Value *V2 = 0,
294 const Value *V3 = 0, const Value *V4 = 0) {
295 msgs << Message << "\n";
303 void CheckFailed( const std::string& Message, const Value* V1,
304 const Type* T2, const Value* V3 = 0 ) {
305 msgs << Message << "\n";
312 } // End anonymous namespace
314 char Verifier::ID = 0;
315 static RegisterPass<Verifier> X("verify", "Module Verifier");
317 // Assert - We know that cond should be true, if not print an error message.
318 #define Assert(C, M) \
319 do { if (!(C)) { CheckFailed(M); return; } } while (0)
320 #define Assert1(C, M, V1) \
321 do { if (!(C)) { CheckFailed(M, V1); return; } } while (0)
322 #define Assert2(C, M, V1, V2) \
323 do { if (!(C)) { CheckFailed(M, V1, V2); return; } } while (0)
324 #define Assert3(C, M, V1, V2, V3) \
325 do { if (!(C)) { CheckFailed(M, V1, V2, V3); return; } } while (0)
326 #define Assert4(C, M, V1, V2, V3, V4) \
327 do { if (!(C)) { CheckFailed(M, V1, V2, V3, V4); return; } } while (0)
330 void Verifier::visitGlobalValue(GlobalValue &GV) {
331 Assert1(!GV.isDeclaration() ||
332 GV.hasExternalLinkage() ||
333 GV.hasDLLImportLinkage() ||
334 GV.hasExternalWeakLinkage() ||
335 GV.hasGhostLinkage() ||
336 (isa<GlobalAlias>(GV) &&
337 (GV.hasInternalLinkage() || GV.hasWeakLinkage())),
338 "Global is external, but doesn't have external or dllimport or weak linkage!",
341 Assert1(!GV.hasDLLImportLinkage() || GV.isDeclaration(),
342 "Global is marked as dllimport, but not external", &GV);
344 Assert1(!GV.hasAppendingLinkage() || isa<GlobalVariable>(GV),
345 "Only global variables can have appending linkage!", &GV);
347 if (GV.hasAppendingLinkage()) {
348 GlobalVariable &GVar = cast<GlobalVariable>(GV);
349 Assert1(isa<ArrayType>(GVar.getType()->getElementType()),
350 "Only global arrays can have appending linkage!", &GV);
354 void Verifier::visitGlobalVariable(GlobalVariable &GV) {
355 if (GV.hasInitializer()) {
356 Assert1(GV.getInitializer()->getType() == GV.getType()->getElementType(),
357 "Global variable initializer type does not match global "
358 "variable type!", &GV);
360 Assert1(GV.hasExternalLinkage() || GV.hasDLLImportLinkage() ||
361 GV.hasExternalWeakLinkage(),
362 "invalid linkage type for global declaration", &GV);
365 visitGlobalValue(GV);
368 void Verifier::visitGlobalAlias(GlobalAlias &GA) {
369 Assert1(!GA.getName().empty(),
370 "Alias name cannot be empty!", &GA);
371 Assert1(GA.hasExternalLinkage() || GA.hasInternalLinkage() ||
373 "Alias should have external or external weak linkage!", &GA);
374 Assert1(GA.getAliasee(),
375 "Aliasee cannot be NULL!", &GA);
376 Assert1(GA.getType() == GA.getAliasee()->getType(),
377 "Alias and aliasee types should match!", &GA);
379 if (!isa<GlobalValue>(GA.getAliasee())) {
380 const ConstantExpr *CE = dyn_cast<ConstantExpr>(GA.getAliasee());
381 Assert1(CE && CE->getOpcode() == Instruction::BitCast &&
382 isa<GlobalValue>(CE->getOperand(0)),
383 "Aliasee should be either GlobalValue or bitcast of GlobalValue",
387 const GlobalValue* Aliasee = GA.resolveAliasedGlobal();
389 "Aliasing chain should end with function or global variable", &GA);
391 visitGlobalValue(GA);
394 void Verifier::verifyTypeSymbolTable(TypeSymbolTable &ST) {
397 // VerifyAttrs - Check the given parameter attributes for an argument or return
398 // value of the specified type. The value V is printed in error messages.
399 void Verifier::VerifyAttrs(ParameterAttributes Attrs, const Type *Ty,
400 bool isReturnValue, const Value *V) {
401 if (Attrs == ParamAttr::None)
405 ParameterAttributes RetI = Attrs & ParamAttr::ParameterOnly;
406 Assert1(!RetI, "Attribute " + ParamAttr::getAsString(RetI) +
407 " does not apply to return values!", V);
409 ParameterAttributes ParmI = Attrs & ParamAttr::ReturnOnly;
410 Assert1(!ParmI, "Attribute " + ParamAttr::getAsString(ParmI) +
411 " only applies to return values!", V);
415 i < array_lengthof(ParamAttr::MutuallyIncompatible); ++i) {
416 ParameterAttributes MutI = Attrs & ParamAttr::MutuallyIncompatible[i];
417 Assert1(!(MutI & (MutI - 1)), "Attributes " +
418 ParamAttr::getAsString(MutI) + " are incompatible!", V);
421 ParameterAttributes TypeI = Attrs & ParamAttr::typeIncompatible(Ty);
422 Assert1(!TypeI, "Wrong type for attribute " +
423 ParamAttr::getAsString(TypeI), V);
425 ParameterAttributes ByValI = Attrs & ParamAttr::ByVal;
426 if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) {
427 Assert1(!ByValI || PTy->getElementType()->isSized(),
428 "Attribute " + ParamAttr::getAsString(ByValI) +
429 " does not support unsized types!", V);
432 "Attribute " + ParamAttr::getAsString(ByValI) +
433 " only applies to parameters with pointer type!", V);
437 // VerifyFunctionAttrs - Check parameter attributes against a function type.
438 // The value V is printed in error messages.
439 void Verifier::VerifyFunctionAttrs(const FunctionType *FT,
440 const PAListPtr &Attrs,
445 bool SawNest = false;
447 for (unsigned i = 0, e = Attrs.getNumSlots(); i != e; ++i) {
448 const ParamAttrsWithIndex &Attr = Attrs.getSlot(i);
452 Ty = FT->getReturnType();
453 else if (Attr.Index-1 < FT->getNumParams())
454 Ty = FT->getParamType(Attr.Index-1);
456 break; // VarArgs attributes, don't verify.
458 VerifyAttrs(Attr.Attrs, Ty, Attr.Index == 0, V);
460 if (Attr.Attrs & ParamAttr::Nest) {
461 Assert1(!SawNest, "More than one parameter has attribute nest!", V);
465 if (Attr.Attrs & ParamAttr::StructRet)
466 Assert1(Attr.Index == 1, "Attribute sret not on first parameter!", V);
470 // visitFunction - Verify that a function is ok.
472 void Verifier::visitFunction(Function &F) {
473 // Check function arguments.
474 const FunctionType *FT = F.getFunctionType();
475 unsigned NumArgs = F.arg_size();
477 Assert2(FT->getNumParams() == NumArgs,
478 "# formal arguments must match # of arguments for function type!",
480 Assert1(F.getReturnType()->isFirstClassType() ||
481 F.getReturnType() == Type::VoidTy ||
482 isa<StructType>(F.getReturnType()),
483 "Functions cannot return aggregate values!", &F);
485 Assert1(!F.hasStructRetAttr() || F.getReturnType() == Type::VoidTy,
486 "Invalid struct return type!", &F);
488 const PAListPtr &Attrs = F.getParamAttrs();
490 Assert1(Attrs.isEmpty() ||
491 Attrs.getSlot(Attrs.getNumSlots()-1).Index <= FT->getNumParams(),
492 "Attributes after last parameter!", &F);
494 // Check function attributes.
495 VerifyFunctionAttrs(FT, Attrs, &F);
497 // Check that this function meets the restrictions on this calling convention.
498 switch (F.getCallingConv()) {
502 case CallingConv::X86_SSECall:
504 case CallingConv::Fast:
505 case CallingConv::Cold:
506 case CallingConv::X86_FastCall:
507 Assert1(!F.isVarArg(),
508 "Varargs functions must have C calling conventions!", &F);
512 // Check that the argument values match the function type for this function...
514 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end();
516 Assert2(I->getType() == FT->getParamType(i),
517 "Argument value does not match function argument type!",
518 I, FT->getParamType(i));
519 Assert1(I->getType()->isFirstClassType(),
520 "Function arguments must have first-class types!", I);
523 if (F.isDeclaration()) {
524 Assert1(F.hasExternalLinkage() || F.hasDLLImportLinkage() ||
525 F.hasExternalWeakLinkage() || F.hasGhostLinkage(),
526 "invalid linkage type for function declaration", &F);
528 // Verify that this function (which has a body) is not named "llvm.*". It
529 // is not legal to define intrinsics.
530 if (F.getName().size() >= 5)
531 Assert1(F.getName().substr(0, 5) != "llvm.",
532 "llvm intrinsics cannot be defined!", &F);
534 // Check the entry node
535 BasicBlock *Entry = &F.getEntryBlock();
536 Assert1(pred_begin(Entry) == pred_end(Entry),
537 "Entry block to function must not have predecessors!", Entry);
542 // verifyBasicBlock - Verify that a basic block is well formed...
544 void Verifier::visitBasicBlock(BasicBlock &BB) {
545 InstsInThisBlock.clear();
547 // Ensure that basic blocks have terminators!
548 Assert1(BB.getTerminator(), "Basic Block does not have terminator!", &BB);
550 // Check constraints that this basic block imposes on all of the PHI nodes in
552 if (isa<PHINode>(BB.front())) {
553 SmallVector<BasicBlock*, 8> Preds(pred_begin(&BB), pred_end(&BB));
554 SmallVector<std::pair<BasicBlock*, Value*>, 8> Values;
555 std::sort(Preds.begin(), Preds.end());
557 for (BasicBlock::iterator I = BB.begin(); (PN = dyn_cast<PHINode>(I));++I) {
559 // Ensure that PHI nodes have at least one entry!
560 Assert1(PN->getNumIncomingValues() != 0,
561 "PHI nodes must have at least one entry. If the block is dead, "
562 "the PHI should be removed!", PN);
563 Assert1(PN->getNumIncomingValues() == Preds.size(),
564 "PHINode should have one entry for each predecessor of its "
565 "parent basic block!", PN);
567 // Get and sort all incoming values in the PHI node...
569 Values.reserve(PN->getNumIncomingValues());
570 for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
571 Values.push_back(std::make_pair(PN->getIncomingBlock(i),
572 PN->getIncomingValue(i)));
573 std::sort(Values.begin(), Values.end());
575 for (unsigned i = 0, e = Values.size(); i != e; ++i) {
576 // Check to make sure that if there is more than one entry for a
577 // particular basic block in this PHI node, that the incoming values are
580 Assert4(i == 0 || Values[i].first != Values[i-1].first ||
581 Values[i].second == Values[i-1].second,
582 "PHI node has multiple entries for the same basic block with "
583 "different incoming values!", PN, Values[i].first,
584 Values[i].second, Values[i-1].second);
586 // Check to make sure that the predecessors and PHI node entries are
588 Assert3(Values[i].first == Preds[i],
589 "PHI node entries do not match predecessors!", PN,
590 Values[i].first, Preds[i]);
596 void Verifier::visitTerminatorInst(TerminatorInst &I) {
597 // Ensure that terminators only exist at the end of the basic block.
598 Assert1(&I == I.getParent()->getTerminator(),
599 "Terminator found in the middle of a basic block!", I.getParent());
603 void Verifier::visitReturnInst(ReturnInst &RI) {
604 Function *F = RI.getParent()->getParent();
605 unsigned N = RI.getNumOperands();
606 if (F->getReturnType() == Type::VoidTy)
608 "Found return instr that returns void in Function of non-void "
609 "return type!", &RI, F->getReturnType());
610 else if (N == 1 && F->getReturnType() == RI.getOperand(0)->getType()) {
611 // Exactly one return value and it matches the return type. Good.
612 } else if (const StructType *STy = dyn_cast<StructType>(F->getReturnType())) {
613 // The return type is a struct; check for multiple return values.
614 Assert2(STy->getNumElements() == N,
615 "Incorrect number of return values in ret instruction!",
616 &RI, F->getReturnType());
617 for (unsigned i = 0; i != N; ++i)
618 Assert2(STy->getElementType(i) == RI.getOperand(i)->getType(),
619 "Function return type does not match operand "
620 "type of return inst!", &RI, F->getReturnType());
621 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(F->getReturnType())) {
622 // The return type is an array; check for multiple return values.
623 Assert2(ATy->getNumElements() == N,
624 "Incorrect number of return values in ret instruction!",
625 &RI, F->getReturnType());
626 for (unsigned i = 0; i != N; ++i)
627 Assert2(ATy->getElementType() == RI.getOperand(i)->getType(),
628 "Function return type does not match operand "
629 "type of return inst!", &RI, F->getReturnType());
631 CheckFailed("Function return type does not match operand "
632 "type of return inst!", &RI, F->getReturnType());
635 // Check to make sure that the return value has necessary properties for
637 visitTerminatorInst(RI);
640 void Verifier::visitSwitchInst(SwitchInst &SI) {
641 // Check to make sure that all of the constants in the switch instruction
642 // have the same type as the switched-on value.
643 const Type *SwitchTy = SI.getCondition()->getType();
644 for (unsigned i = 1, e = SI.getNumCases(); i != e; ++i)
645 Assert1(SI.getCaseValue(i)->getType() == SwitchTy,
646 "Switch constants must all be same type as switch value!", &SI);
648 visitTerminatorInst(SI);
651 void Verifier::visitSelectInst(SelectInst &SI) {
652 Assert1(SI.getCondition()->getType() == Type::Int1Ty,
653 "Select condition type must be bool!", &SI);
654 Assert1(SI.getTrueValue()->getType() == SI.getFalseValue()->getType(),
655 "Select values must have identical types!", &SI);
656 Assert1(SI.getTrueValue()->getType() == SI.getType(),
657 "Select values must have same type as select instruction!", &SI);
658 visitInstruction(SI);
662 /// visitUserOp1 - User defined operators shouldn't live beyond the lifetime of
663 /// a pass, if any exist, it's an error.
665 void Verifier::visitUserOp1(Instruction &I) {
666 Assert1(0, "User-defined operators should not live outside of a pass!", &I);
669 void Verifier::visitTruncInst(TruncInst &I) {
670 // Get the source and destination types
671 const Type *SrcTy = I.getOperand(0)->getType();
672 const Type *DestTy = I.getType();
674 // Get the size of the types in bits, we'll need this later
675 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
676 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
678 Assert1(SrcTy->isIntOrIntVector(), "Trunc only operates on integer", &I);
679 Assert1(DestTy->isIntOrIntVector(), "Trunc only produces integer", &I);
680 Assert1(SrcBitSize > DestBitSize,"DestTy too big for Trunc", &I);
685 void Verifier::visitZExtInst(ZExtInst &I) {
686 // Get the source and destination types
687 const Type *SrcTy = I.getOperand(0)->getType();
688 const Type *DestTy = I.getType();
690 // Get the size of the types in bits, we'll need this later
691 Assert1(SrcTy->isIntOrIntVector(), "ZExt only operates on integer", &I);
692 Assert1(DestTy->isIntOrIntVector(), "ZExt only produces an integer", &I);
693 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
694 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
696 Assert1(SrcBitSize < DestBitSize,"Type too small for ZExt", &I);
701 void Verifier::visitSExtInst(SExtInst &I) {
702 // Get the source and destination types
703 const Type *SrcTy = I.getOperand(0)->getType();
704 const Type *DestTy = I.getType();
706 // Get the size of the types in bits, we'll need this later
707 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
708 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
710 Assert1(SrcTy->isIntOrIntVector(), "SExt only operates on integer", &I);
711 Assert1(DestTy->isIntOrIntVector(), "SExt only produces an integer", &I);
712 Assert1(SrcBitSize < DestBitSize,"Type too small for SExt", &I);
717 void Verifier::visitFPTruncInst(FPTruncInst &I) {
718 // Get the source and destination types
719 const Type *SrcTy = I.getOperand(0)->getType();
720 const Type *DestTy = I.getType();
721 // Get the size of the types in bits, we'll need this later
722 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
723 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
725 Assert1(SrcTy->isFPOrFPVector(),"FPTrunc only operates on FP", &I);
726 Assert1(DestTy->isFPOrFPVector(),"FPTrunc only produces an FP", &I);
727 Assert1(SrcBitSize > DestBitSize,"DestTy too big for FPTrunc", &I);
732 void Verifier::visitFPExtInst(FPExtInst &I) {
733 // Get the source and destination types
734 const Type *SrcTy = I.getOperand(0)->getType();
735 const Type *DestTy = I.getType();
737 // Get the size of the types in bits, we'll need this later
738 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
739 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
741 Assert1(SrcTy->isFPOrFPVector(),"FPExt only operates on FP", &I);
742 Assert1(DestTy->isFPOrFPVector(),"FPExt only produces an FP", &I);
743 Assert1(SrcBitSize < DestBitSize,"DestTy too small for FPExt", &I);
748 void Verifier::visitUIToFPInst(UIToFPInst &I) {
749 // Get the source and destination types
750 const Type *SrcTy = I.getOperand(0)->getType();
751 const Type *DestTy = I.getType();
753 bool SrcVec = isa<VectorType>(SrcTy);
754 bool DstVec = isa<VectorType>(DestTy);
756 Assert1(SrcVec == DstVec,
757 "UIToFP source and dest must both be vector or scalar", &I);
758 Assert1(SrcTy->isIntOrIntVector(),
759 "UIToFP source must be integer or integer vector", &I);
760 Assert1(DestTy->isFPOrFPVector(),
761 "UIToFP result must be FP or FP vector", &I);
763 if (SrcVec && DstVec)
764 Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
765 cast<VectorType>(DestTy)->getNumElements(),
766 "UIToFP source and dest vector length mismatch", &I);
771 void Verifier::visitSIToFPInst(SIToFPInst &I) {
772 // Get the source and destination types
773 const Type *SrcTy = I.getOperand(0)->getType();
774 const Type *DestTy = I.getType();
776 bool SrcVec = SrcTy->getTypeID() == Type::VectorTyID;
777 bool DstVec = DestTy->getTypeID() == Type::VectorTyID;
779 Assert1(SrcVec == DstVec,
780 "SIToFP source and dest must both be vector or scalar", &I);
781 Assert1(SrcTy->isIntOrIntVector(),
782 "SIToFP source must be integer or integer vector", &I);
783 Assert1(DestTy->isFPOrFPVector(),
784 "SIToFP result must be FP or FP vector", &I);
786 if (SrcVec && DstVec)
787 Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
788 cast<VectorType>(DestTy)->getNumElements(),
789 "SIToFP source and dest vector length mismatch", &I);
794 void Verifier::visitFPToUIInst(FPToUIInst &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 "FPToUI source and dest must both be vector or scalar", &I);
804 Assert1(SrcTy->isFPOrFPVector(), "FPToUI source must be FP or FP vector", &I);
805 Assert1(DestTy->isIntOrIntVector(),
806 "FPToUI result must be integer or integer vector", &I);
808 if (SrcVec && DstVec)
809 Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
810 cast<VectorType>(DestTy)->getNumElements(),
811 "FPToUI source and dest vector length mismatch", &I);
816 void Verifier::visitFPToSIInst(FPToSIInst &I) {
817 // Get the source and destination types
818 const Type *SrcTy = I.getOperand(0)->getType();
819 const Type *DestTy = I.getType();
821 bool SrcVec = isa<VectorType>(SrcTy);
822 bool DstVec = isa<VectorType>(DestTy);
824 Assert1(SrcVec == DstVec,
825 "FPToSI source and dest must both be vector or scalar", &I);
826 Assert1(SrcTy->isFPOrFPVector(),
827 "FPToSI source must be FP or FP vector", &I);
828 Assert1(DestTy->isIntOrIntVector(),
829 "FPToSI result must be integer or integer vector", &I);
831 if (SrcVec && DstVec)
832 Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
833 cast<VectorType>(DestTy)->getNumElements(),
834 "FPToSI source and dest vector length mismatch", &I);
839 void Verifier::visitPtrToIntInst(PtrToIntInst &I) {
840 // Get the source and destination types
841 const Type *SrcTy = I.getOperand(0)->getType();
842 const Type *DestTy = I.getType();
844 Assert1(isa<PointerType>(SrcTy), "PtrToInt source must be pointer", &I);
845 Assert1(DestTy->isInteger(), "PtrToInt result must be integral", &I);
850 void Verifier::visitIntToPtrInst(IntToPtrInst &I) {
851 // Get the source and destination types
852 const Type *SrcTy = I.getOperand(0)->getType();
853 const Type *DestTy = I.getType();
855 Assert1(SrcTy->isInteger(), "IntToPtr source must be an integral", &I);
856 Assert1(isa<PointerType>(DestTy), "IntToPtr result must be a pointer",&I);
861 void Verifier::visitBitCastInst(BitCastInst &I) {
862 // Get the source and destination types
863 const Type *SrcTy = I.getOperand(0)->getType();
864 const Type *DestTy = I.getType();
866 // Get the size of the types in bits, we'll need this later
867 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
868 unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
870 // BitCast implies a no-op cast of type only. No bits change.
871 // However, you can't cast pointers to anything but pointers.
872 Assert1(isa<PointerType>(DestTy) == isa<PointerType>(DestTy),
873 "Bitcast requires both operands to be pointer or neither", &I);
874 Assert1(SrcBitSize == DestBitSize, "Bitcast requies types of same width", &I);
879 /// visitPHINode - Ensure that a PHI node is well formed.
881 void Verifier::visitPHINode(PHINode &PN) {
882 // Ensure that the PHI nodes are all grouped together at the top of the block.
883 // This can be tested by checking whether the instruction before this is
884 // either nonexistent (because this is begin()) or is a PHI node. If not,
885 // then there is some other instruction before a PHI.
886 Assert2(&PN == &PN.getParent()->front() ||
887 isa<PHINode>(--BasicBlock::iterator(&PN)),
888 "PHI nodes not grouped at top of basic block!",
889 &PN, PN.getParent());
891 // Check that all of the operands of the PHI node have the same type as the
893 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i)
894 Assert1(PN.getType() == PN.getIncomingValue(i)->getType(),
895 "PHI node operands are not the same type as the result!", &PN);
897 // All other PHI node constraints are checked in the visitBasicBlock method.
899 visitInstruction(PN);
902 void Verifier::VerifyCallSite(CallSite CS) {
903 Instruction *I = CS.getInstruction();
905 Assert1(isa<PointerType>(CS.getCalledValue()->getType()),
906 "Called function must be a pointer!", I);
907 const PointerType *FPTy = cast<PointerType>(CS.getCalledValue()->getType());
908 Assert1(isa<FunctionType>(FPTy->getElementType()),
909 "Called function is not pointer to function type!", I);
911 const FunctionType *FTy = cast<FunctionType>(FPTy->getElementType());
913 // Verify that the correct number of arguments are being passed
915 Assert1(CS.arg_size() >= FTy->getNumParams(),
916 "Called function requires more parameters than were provided!",I);
918 Assert1(CS.arg_size() == FTy->getNumParams(),
919 "Incorrect number of arguments passed to called function!", I);
921 // Verify that all arguments to the call match the function type...
922 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
923 Assert3(CS.getArgument(i)->getType() == FTy->getParamType(i),
924 "Call parameter type does not match function signature!",
925 CS.getArgument(i), FTy->getParamType(i), I);
927 const PAListPtr &Attrs = CS.getParamAttrs();
929 Assert1(Attrs.isEmpty() ||
930 Attrs.getSlot(Attrs.getNumSlots()-1).Index <= CS.arg_size(),
931 "Attributes after last parameter!", I);
933 // Verify call attributes.
934 VerifyFunctionAttrs(FTy, Attrs, I);
937 // Check attributes on the varargs part.
938 for (unsigned Idx = 1 + FTy->getNumParams(); Idx <= CS.arg_size(); ++Idx) {
939 ParameterAttributes Attr = Attrs.getParamAttrs(Idx);
941 VerifyAttrs(Attr, CS.getArgument(Idx-1)->getType(), false, I);
943 ParameterAttributes VArgI = Attr & ParamAttr::VarArgsIncompatible;
944 Assert1(!VArgI, "Attribute " + ParamAttr::getAsString(VArgI) +
945 " cannot be used for vararg call arguments!", I);
948 visitInstruction(*I);
951 void Verifier::visitCallInst(CallInst &CI) {
954 if (Function *F = CI.getCalledFunction()) {
955 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
956 visitIntrinsicFunctionCall(ID, CI);
960 void Verifier::visitInvokeInst(InvokeInst &II) {
964 /// visitBinaryOperator - Check that both arguments to the binary operator are
965 /// of the same type!
967 void Verifier::visitBinaryOperator(BinaryOperator &B) {
968 Assert1(B.getOperand(0)->getType() == B.getOperand(1)->getType(),
969 "Both operands to a binary operator are not of the same type!", &B);
971 switch (B.getOpcode()) {
972 // Check that logical operators are only used with integral operands.
973 case Instruction::And:
974 case Instruction::Or:
975 case Instruction::Xor:
976 Assert1(B.getType()->isInteger() ||
977 (isa<VectorType>(B.getType()) &&
978 cast<VectorType>(B.getType())->getElementType()->isInteger()),
979 "Logical operators only work with integral types!", &B);
980 Assert1(B.getType() == B.getOperand(0)->getType(),
981 "Logical operators must have same type for operands and result!",
984 case Instruction::Shl:
985 case Instruction::LShr:
986 case Instruction::AShr:
987 Assert1(B.getType()->isInteger() ||
988 (isa<VectorType>(B.getType()) &&
989 cast<VectorType>(B.getType())->getElementType()->isInteger()),
990 "Shifts only work with integral types!", &B);
991 Assert1(B.getType() == B.getOperand(0)->getType(),
992 "Shift return type must be same as operands!", &B);
995 // Arithmetic operators only work on integer or fp values
996 Assert1(B.getType() == B.getOperand(0)->getType(),
997 "Arithmetic operators must have same type for operands and result!",
999 Assert1(B.getType()->isInteger() || B.getType()->isFloatingPoint() ||
1000 isa<VectorType>(B.getType()),
1001 "Arithmetic operators must have integer, fp, or vector type!", &B);
1005 visitInstruction(B);
1008 void Verifier::visitICmpInst(ICmpInst& IC) {
1009 // Check that the operands are the same type
1010 const Type* Op0Ty = IC.getOperand(0)->getType();
1011 const Type* Op1Ty = IC.getOperand(1)->getType();
1012 Assert1(Op0Ty == Op1Ty,
1013 "Both operands to ICmp instruction are not of the same type!", &IC);
1014 // Check that the operands are the right type
1015 Assert1(Op0Ty->isInteger() || isa<PointerType>(Op0Ty),
1016 "Invalid operand types for ICmp instruction", &IC);
1017 visitInstruction(IC);
1020 void Verifier::visitFCmpInst(FCmpInst& FC) {
1021 // Check that the operands are the same type
1022 const Type* Op0Ty = FC.getOperand(0)->getType();
1023 const Type* Op1Ty = FC.getOperand(1)->getType();
1024 Assert1(Op0Ty == Op1Ty,
1025 "Both operands to FCmp instruction are not of the same type!", &FC);
1026 // Check that the operands are the right type
1027 Assert1(Op0Ty->isFloatingPoint(),
1028 "Invalid operand types for FCmp instruction", &FC);
1029 visitInstruction(FC);
1032 void Verifier::visitExtractElementInst(ExtractElementInst &EI) {
1033 Assert1(ExtractElementInst::isValidOperands(EI.getOperand(0),
1035 "Invalid extractelement operands!", &EI);
1036 visitInstruction(EI);
1039 void Verifier::visitInsertElementInst(InsertElementInst &IE) {
1040 Assert1(InsertElementInst::isValidOperands(IE.getOperand(0),
1043 "Invalid insertelement operands!", &IE);
1044 visitInstruction(IE);
1047 void Verifier::visitShuffleVectorInst(ShuffleVectorInst &SV) {
1048 Assert1(ShuffleVectorInst::isValidOperands(SV.getOperand(0), SV.getOperand(1),
1050 "Invalid shufflevector operands!", &SV);
1051 Assert1(SV.getType() == SV.getOperand(0)->getType(),
1052 "Result of shufflevector must match first operand type!", &SV);
1054 // Check to see if Mask is valid.
1055 if (const ConstantVector *MV = dyn_cast<ConstantVector>(SV.getOperand(2))) {
1056 for (unsigned i = 0, e = MV->getNumOperands(); i != e; ++i) {
1057 if (ConstantInt* CI = dyn_cast<ConstantInt>(MV->getOperand(i))) {
1058 Assert1(!CI->uge(MV->getNumOperands()*2),
1059 "Invalid shufflevector shuffle mask!", &SV);
1061 Assert1(isa<UndefValue>(MV->getOperand(i)),
1062 "Invalid shufflevector shuffle mask!", &SV);
1066 Assert1(isa<UndefValue>(SV.getOperand(2)) ||
1067 isa<ConstantAggregateZero>(SV.getOperand(2)),
1068 "Invalid shufflevector shuffle mask!", &SV);
1071 visitInstruction(SV);
1074 void Verifier::visitGetElementPtrInst(GetElementPtrInst &GEP) {
1075 SmallVector<Value*, 16> Idxs(GEP.idx_begin(), GEP.idx_end());
1077 GetElementPtrInst::getIndexedType(GEP.getOperand(0)->getType(),
1078 Idxs.begin(), Idxs.end());
1079 Assert1(ElTy, "Invalid indices for GEP pointer type!", &GEP);
1080 Assert2(isa<PointerType>(GEP.getType()) &&
1081 cast<PointerType>(GEP.getType())->getElementType() == ElTy,
1082 "GEP is not of right type for indices!", &GEP, ElTy);
1083 visitInstruction(GEP);
1086 void Verifier::visitLoadInst(LoadInst &LI) {
1088 cast<PointerType>(LI.getOperand(0)->getType())->getElementType();
1089 Assert2(ElTy == LI.getType(),
1090 "Load result type does not match pointer operand type!", &LI, ElTy);
1091 visitInstruction(LI);
1094 void Verifier::visitStoreInst(StoreInst &SI) {
1096 cast<PointerType>(SI.getOperand(1)->getType())->getElementType();
1097 Assert2(ElTy == SI.getOperand(0)->getType(),
1098 "Stored value type does not match pointer operand type!", &SI, ElTy);
1099 visitInstruction(SI);
1102 void Verifier::visitAllocationInst(AllocationInst &AI) {
1103 const PointerType *PTy = AI.getType();
1104 Assert1(PTy->getAddressSpace() == 0,
1105 "Allocation instruction pointer not in the generic address space!",
1107 Assert1(PTy->getElementType()->isSized(), "Cannot allocate unsized type",
1109 visitInstruction(AI);
1112 void Verifier::visitExtractValueInst(ExtractValueInst &EVI) {
1113 Assert1(ExtractValueInst::getIndexedType(EVI.getAggregateOperand()->getType(),
1114 EVI.idx_begin(), EVI.idx_end()) ==
1116 "Invalid ExtractValueInst operands!", &EVI);
1118 visitInstruction(EVI);
1121 void Verifier::visitInsertValueInst(InsertValueInst &IVI) {
1122 Assert1(ExtractValueInst::getIndexedType(IVI.getAggregateOperand()->getType(),
1123 IVI.idx_begin(), IVI.idx_end()) ==
1124 IVI.getOperand(1)->getType(),
1125 "Invalid InsertValueInst operands!", &IVI);
1127 visitInstruction(IVI);
1130 /// verifyInstruction - Verify that an instruction is well formed.
1132 void Verifier::visitInstruction(Instruction &I) {
1133 BasicBlock *BB = I.getParent();
1134 Assert1(BB, "Instruction not embedded in basic block!", &I);
1136 if (!isa<PHINode>(I)) { // Check that non-phi nodes are not self referential
1137 for (Value::use_iterator UI = I.use_begin(), UE = I.use_end();
1139 Assert1(*UI != (User*)&I ||
1140 !DT->dominates(&BB->getParent()->getEntryBlock(), BB),
1141 "Only PHI nodes may reference their own value!", &I);
1144 // Verify that if this is a terminator that it is at the end of the block.
1145 if (isa<TerminatorInst>(I))
1146 Assert1(BB->getTerminator() == &I, "Terminator not at end of block!", &I);
1149 // Check that void typed values don't have names
1150 Assert1(I.getType() != Type::VoidTy || !I.hasName(),
1151 "Instruction has a name, but provides a void value!", &I);
1153 // Check that the return value of the instruction is either void or a legal
1155 Assert1(I.getType() == Type::VoidTy || I.getType()->isFirstClassType()
1156 || ((isa<CallInst>(I) || isa<InvokeInst>(I))
1157 && isa<StructType>(I.getType())),
1158 "Instruction returns a non-scalar type!", &I);
1160 // Check that all uses of the instruction, if they are instructions
1161 // themselves, actually have parent basic blocks. If the use is not an
1162 // instruction, it is an error!
1163 for (User::use_iterator UI = I.use_begin(), UE = I.use_end();
1165 Assert1(isa<Instruction>(*UI), "Use of instruction is not an instruction!",
1167 Instruction *Used = cast<Instruction>(*UI);
1168 Assert2(Used->getParent() != 0, "Instruction referencing instruction not"
1169 " embeded in a basic block!", &I, Used);
1172 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
1173 Assert1(I.getOperand(i) != 0, "Instruction has null operand!", &I);
1175 // Check to make sure that only first-class-values are operands to
1177 if (!I.getOperand(i)->getType()->isFirstClassType()) {
1178 Assert1(0, "Instruction operands must be first-class values!", &I);
1181 if (Function *F = dyn_cast<Function>(I.getOperand(i))) {
1182 // Check to make sure that the "address of" an intrinsic function is never
1184 Assert1(!F->isIntrinsic() || (i == 0 && isa<CallInst>(I)),
1185 "Cannot take the address of an intrinsic!", &I);
1186 Assert1(F->getParent() == Mod, "Referencing function in another module!",
1188 } else if (BasicBlock *OpBB = dyn_cast<BasicBlock>(I.getOperand(i))) {
1189 Assert1(OpBB->getParent() == BB->getParent(),
1190 "Referring to a basic block in another function!", &I);
1191 } else if (Argument *OpArg = dyn_cast<Argument>(I.getOperand(i))) {
1192 Assert1(OpArg->getParent() == BB->getParent(),
1193 "Referring to an argument in another function!", &I);
1194 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(I.getOperand(i))) {
1195 Assert1(GV->getParent() == Mod, "Referencing global in another module!",
1197 } else if (Instruction *Op = dyn_cast<Instruction>(I.getOperand(i))) {
1198 BasicBlock *OpBlock = Op->getParent();
1200 // Check that a definition dominates all of its uses.
1201 if (!isa<PHINode>(I)) {
1202 // Invoke results are only usable in the normal destination, not in the
1203 // exceptional destination.
1204 if (InvokeInst *II = dyn_cast<InvokeInst>(Op)) {
1205 OpBlock = II->getNormalDest();
1207 Assert2(OpBlock != II->getUnwindDest(),
1208 "No uses of invoke possible due to dominance structure!",
1211 // If the normal successor of an invoke instruction has multiple
1212 // predecessors, then the normal edge from the invoke is critical, so
1213 // the invoke value can only be live if the destination block
1214 // dominates all of it's predecessors (other than the invoke) or if
1215 // the invoke value is only used by a phi in the successor.
1216 if (!OpBlock->getSinglePredecessor() &&
1217 DT->dominates(&BB->getParent()->getEntryBlock(), BB)) {
1218 // The first case we allow is if the use is a PHI operand in the
1219 // normal block, and if that PHI operand corresponds to the invoke's
1222 if (PHINode *PN = dyn_cast<PHINode>(&I))
1223 if (PN->getParent() == OpBlock &&
1224 PN->getIncomingBlock(i/2) == Op->getParent())
1227 // If it is used by something non-phi, then the other case is that
1228 // 'OpBlock' dominates all of its predecessors other than the
1229 // invoke. In this case, the invoke value can still be used.
1232 for (pred_iterator PI = pred_begin(OpBlock),
1233 E = pred_end(OpBlock); PI != E; ++PI) {
1234 if (*PI != II->getParent() && !DT->dominates(OpBlock, *PI)) {
1241 "Invoke value defined on critical edge but not dead!", &I,
1244 } else if (OpBlock == BB) {
1245 // If they are in the same basic block, make sure that the definition
1246 // comes before the use.
1247 Assert2(InstsInThisBlock.count(Op) ||
1248 !DT->dominates(&BB->getParent()->getEntryBlock(), BB),
1249 "Instruction does not dominate all uses!", Op, &I);
1252 // Definition must dominate use unless use is unreachable!
1253 Assert2(InstsInThisBlock.count(Op) || DT->dominates(Op, &I) ||
1254 !DT->dominates(&BB->getParent()->getEntryBlock(), BB),
1255 "Instruction does not dominate all uses!", Op, &I);
1257 // PHI nodes are more difficult than other nodes because they actually
1258 // "use" the value in the predecessor basic blocks they correspond to.
1259 BasicBlock *PredBB = cast<BasicBlock>(I.getOperand(i+1));
1260 Assert2(DT->dominates(OpBlock, PredBB) ||
1261 !DT->dominates(&BB->getParent()->getEntryBlock(), PredBB),
1262 "Instruction does not dominate all uses!", Op, &I);
1264 } else if (isa<InlineAsm>(I.getOperand(i))) {
1265 Assert1(i == 0 && (isa<CallInst>(I) || isa<InvokeInst>(I)),
1266 "Cannot take the address of an inline asm!", &I);
1269 InstsInThisBlock.insert(&I);
1272 /// visitIntrinsicFunction - Allow intrinsics to be verified in different ways.
1274 void Verifier::visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI) {
1275 Function *IF = CI.getCalledFunction();
1276 Assert1(IF->isDeclaration(), "Intrinsic functions should never be defined!",
1279 #define GET_INTRINSIC_VERIFIER
1280 #include "llvm/Intrinsics.gen"
1281 #undef GET_INTRINSIC_VERIFIER
1286 case Intrinsic::memcpy_i32:
1287 case Intrinsic::memcpy_i64:
1288 case Intrinsic::memmove_i32:
1289 case Intrinsic::memmove_i64:
1290 case Intrinsic::memset_i32:
1291 case Intrinsic::memset_i64:
1292 Assert1(isa<ConstantInt>(CI.getOperand(4)),
1293 "alignment argument of memory intrinsics must be a constant int",
1296 case Intrinsic::gcroot:
1297 case Intrinsic::gcwrite:
1298 case Intrinsic::gcread:
1299 if (ID == Intrinsic::gcroot) {
1300 Assert1(isa<AllocaInst>(CI.getOperand(1)->stripPointerCasts()),
1301 "llvm.gcroot parameter #1 must be an alloca.", &CI);
1302 Assert1(isa<Constant>(CI.getOperand(2)),
1303 "llvm.gcroot parameter #2 must be a constant.", &CI);
1306 Assert1(CI.getParent()->getParent()->hasGC(),
1307 "Enclosing function does not use GC.", &CI);
1309 case Intrinsic::init_trampoline:
1310 Assert1(isa<Function>(CI.getOperand(2)->stripPointerCasts()),
1311 "llvm.init_trampoline parameter #2 must resolve to a function.",
1317 /// VerifyIntrinsicPrototype - TableGen emits calls to this function into
1318 /// Intrinsics.gen. This implements a little state machine that verifies the
1319 /// prototype of intrinsics.
1320 void Verifier::VerifyIntrinsicPrototype(Intrinsic::ID ID,
1322 unsigned Count, ...) {
1324 va_start(VA, Count);
1325 const FunctionType *FTy = F->getFunctionType();
1327 // For overloaded intrinsics, the Suffix of the function name must match the
1328 // types of the arguments. This variable keeps track of the expected
1329 // suffix, to be checked at the end.
1332 if (FTy->getNumParams() + FTy->isVarArg() != Count - 1) {
1333 CheckFailed("Intrinsic prototype has incorrect number of arguments!", F);
1337 // Note that "arg#0" is the return type.
1338 for (unsigned ArgNo = 0; ArgNo < Count; ++ArgNo) {
1339 int VT = va_arg(VA, int); // An MVT::SimpleValueType when non-negative.
1341 if (VT == MVT::isVoid && ArgNo > 0) {
1342 if (!FTy->isVarArg())
1343 CheckFailed("Intrinsic prototype has no '...'!", F);
1349 Ty = FTy->getReturnType();
1351 Ty = FTy->getParamType(ArgNo-1);
1353 unsigned NumElts = 0;
1354 const Type *EltTy = Ty;
1355 if (const VectorType *VTy = dyn_cast<VectorType>(Ty)) {
1356 EltTy = VTy->getElementType();
1357 NumElts = VTy->getNumElements();
1363 if (Ty != FTy->getReturnType()) {
1364 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " does not "
1365 "match return type.", F);
1369 if (Ty != FTy->getParamType(Match-1)) {
1370 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " does not "
1371 "match parameter %" + utostr(Match-1) + ".", F);
1375 } else if (VT == MVT::iAny) {
1376 if (!EltTy->isInteger()) {
1378 CheckFailed("Intrinsic result type is not "
1379 "an integer type.", F);
1381 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is not "
1382 "an integer type.", F);
1385 unsigned GotBits = cast<IntegerType>(EltTy)->getBitWidth();
1388 Suffix += "v" + utostr(NumElts);
1389 Suffix += "i" + utostr(GotBits);;
1390 // Check some constraints on various intrinsics.
1392 default: break; // Not everything needs to be checked.
1393 case Intrinsic::bswap:
1394 if (GotBits < 16 || GotBits % 16 != 0)
1395 CheckFailed("Intrinsic requires even byte width argument", F);
1398 } else if (VT == MVT::fAny) {
1399 if (!EltTy->isFloatingPoint()) {
1401 CheckFailed("Intrinsic result type is not "
1402 "a floating-point type.", F);
1404 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is not "
1405 "a floating-point type.", F);
1410 Suffix += "v" + utostr(NumElts);
1411 Suffix += MVT::getMVT(EltTy).getMVTString();
1412 } else if (VT == MVT::iPTR) {
1413 if (!isa<PointerType>(Ty)) {
1415 CheckFailed("Intrinsic result type is not a "
1416 "pointer and a pointer is required.", F);
1418 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is not a "
1419 "pointer and a pointer is required.", F);
1421 } else if (VT == MVT::iPTRAny) {
1422 // Outside of TableGen, we don't distinguish iPTRAny (to any address
1423 // space) and iPTR. In the verifier, we can not distinguish which case
1424 // we have so allow either case to be legal.
1425 if (const PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
1426 Suffix += ".p" + utostr(PTyp->getAddressSpace()) +
1427 MVT::getMVT(PTyp->getElementType()).getMVTString();
1430 CheckFailed("Intrinsic result type is not a "
1431 "pointer and a pointer is required.", F);
1433 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is not a "
1434 "pointer and a pointer is required.", F);
1437 } else if (MVT((MVT::SimpleValueType)VT).isVector()) {
1438 MVT VVT = MVT((MVT::SimpleValueType)VT);
1439 // If this is a vector argument, verify the number and type of elements.
1440 if (VVT.getVectorElementType() != MVT::getMVT(EltTy)) {
1441 CheckFailed("Intrinsic prototype has incorrect vector element type!",
1445 if (VVT.getVectorNumElements() != NumElts) {
1446 CheckFailed("Intrinsic prototype has incorrect number of "
1447 "vector elements!",F);
1450 } else if (MVT((MVT::SimpleValueType)VT).getTypeForMVT() != EltTy) {
1452 CheckFailed("Intrinsic prototype has incorrect result type!", F);
1454 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is wrong!",F);
1456 } else if (EltTy != Ty) {
1458 CheckFailed("Intrinsic result type is vector "
1459 "and a scalar is required.", F);
1461 CheckFailed("Intrinsic parameter #" + utostr(ArgNo-1) + " is vector "
1462 "and a scalar is required.", F);
1468 // For intrinsics without pointer arguments, if we computed a Suffix then the
1469 // intrinsic is overloaded and we need to make sure that the name of the
1470 // function is correct. We add the suffix to the name of the intrinsic and
1471 // compare against the given function name. If they are not the same, the
1472 // function name is invalid. This ensures that overloading of intrinsics
1473 // uses a sane and consistent naming convention. Note that intrinsics with
1474 // pointer argument may or may not be overloaded so we will check assuming it
1475 // has a suffix and not.
1476 if (!Suffix.empty()) {
1477 std::string Name(Intrinsic::getName(ID));
1478 if (Name + Suffix != F->getName()) {
1479 CheckFailed("Overloaded intrinsic has incorrect suffix: '" +
1480 F->getName().substr(Name.length()) + "'. It should be '" +
1485 // Check parameter attributes.
1486 Assert1(F->getParamAttrs() == Intrinsic::getParamAttrs(ID),
1487 "Intrinsic has wrong parameter attributes!", F);
1491 //===----------------------------------------------------------------------===//
1492 // Implement the public interfaces to this file...
1493 //===----------------------------------------------------------------------===//
1495 FunctionPass *llvm::createVerifierPass(VerifierFailureAction action) {
1496 return new Verifier(action);
1500 // verifyFunction - Create
1501 bool llvm::verifyFunction(const Function &f, VerifierFailureAction action) {
1502 Function &F = const_cast<Function&>(f);
1503 assert(!F.isDeclaration() && "Cannot verify external functions");
1505 FunctionPassManager FPM(new ExistingModuleProvider(F.getParent()));
1506 Verifier *V = new Verifier(action);
1512 /// verifyModule - Check a module for errors, printing messages on stderr.
1513 /// Return true if the module is corrupt.
1515 bool llvm::verifyModule(const Module &M, VerifierFailureAction action,
1516 std::string *ErrorInfo) {
1518 Verifier *V = new Verifier(action);
1520 PM.run(const_cast<Module&>(M));
1522 if (ErrorInfo && V->Broken)
1523 *ErrorInfo = V->msgs.str();