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llvm-6502/lib/VMCore/Verifier.cpp
Jeffrey Yasskin f0356fe140 Kill ModuleProvider and ghost linkage by inverting the relationship between 
Modules and ModuleProviders. Because the "ModuleProvider" simply materializes
GlobalValues now, and doesn't provide modules, it's renamed to
"GVMaterializer". Code that used to need a ModuleProvider to materialize
Functions can now materialize the Functions directly. Functions no longer use a
magic linkage to record that they're materializable; they simply ask the
GVMaterializer.

Because the C ABI must never change, we can't remove LLVMModuleProviderRef or
the functions that refer to it. Instead, because Module now exposes the same
functionality ModuleProvider used to, we store a Module* in any
LLVMModuleProviderRef and translate in the wrapper methods.  The bindings to
other languages still use the ModuleProvider concept.  It would probably be
worth some time to update them to follow the C++ more closely, but I don't
intend to do it.

Fixes http://llvm.org/PR5737 and http://llvm.org/PR5735.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94686 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-27 20:34:15 +00:00

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//===-- Verifier.cpp - Implement the Module Verifier -------------*- C++ -*-==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the function verifier interface, that can be used for some
// sanity checking of input to the system.
//
// Note that this does not provide full `Java style' security and verifications,
// instead it just tries to ensure that code is well-formed.
//
// * Both of a binary operator's parameters are of the same type
// * Verify that the indices of mem access instructions match other operands
// * Verify that arithmetic and other things are only performed on first-class
// types. Verify that shifts & logicals only happen on integrals f.e.
// * All of the constants in a switch statement are of the correct type
// * The code is in valid SSA form
// * It should be illegal to put a label into any other type (like a structure)
// or to return one. [except constant arrays!]
// * Only phi nodes can be self referential: 'add i32 %0, %0 ; <int>:0' is bad
// * PHI nodes must have an entry for each predecessor, with no extras.
// * PHI nodes must be the first thing in a basic block, all grouped together
// * PHI nodes must have at least one entry
// * All basic blocks should only end with terminator insts, not contain them
// * The entry node to a function must not have predecessors
// * All Instructions must be embedded into a basic block
// * Functions cannot take a void-typed parameter
// * Verify that a function's argument list agrees with it's declared type.
// * It is illegal to specify a name for a void value.
// * It is illegal to have a internal global value with no initializer
// * It is illegal to have a ret instruction that returns a value that does not
// agree with the function return value type.
// * Function call argument types match the function prototype
// * All other things that are tested by asserts spread about the code...
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Verifier.h"
#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/InlineAsm.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Metadata.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/PassManager.h"
#include "llvm/TypeSymbolTable.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstdarg>
using namespace llvm;
namespace { // Anonymous namespace for class
struct PreVerifier : public FunctionPass {
static char ID; // Pass ID, replacement for typeid
PreVerifier() : FunctionPass(&ID) { }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
// Check that the prerequisites for successful DominatorTree construction
// are satisfied.
bool runOnFunction(Function &F) {
bool Broken = false;
for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
if (I->empty() || !I->back().isTerminator()) {
dbgs() << "Basic Block does not have terminator!\n";
WriteAsOperand(dbgs(), I, true);
dbgs() << "\n";
Broken = true;
}
}
if (Broken)
llvm_report_error("Broken module, no Basic Block terminator!");
return false;
}
};
}
char PreVerifier::ID = 0;
static RegisterPass<PreVerifier>
PreVer("preverify", "Preliminary module verification");
static const PassInfo *const PreVerifyID = &PreVer;
namespace {
class TypeSet : public AbstractTypeUser {
public:
TypeSet() {}
/// Insert a type into the set of types.
bool insert(const Type *Ty) {
if (!Types.insert(Ty))
return false;
if (Ty->isAbstract())
Ty->addAbstractTypeUser(this);
return true;
}
// Remove ourselves as abstract type listeners for any types that remain
// abstract when the TypeSet is destroyed.
~TypeSet() {
for (SmallSetVector<const Type *, 16>::iterator I = Types.begin(),
E = Types.end(); I != E; ++I) {
const Type *Ty = *I;
if (Ty->isAbstract())
Ty->removeAbstractTypeUser(this);
}
}
// Abstract type user interface.
/// Remove types from the set when refined. Do not insert the type it was
/// refined to because that type hasn't been verified yet.
void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
Types.remove(OldTy);
OldTy->removeAbstractTypeUser(this);
}
/// Stop listening for changes to a type which is no longer abstract.
void typeBecameConcrete(const DerivedType *AbsTy) {
AbsTy->removeAbstractTypeUser(this);
}
void dump() const {}
private:
SmallSetVector<const Type *, 16> Types;
// Disallow copying.
TypeSet(const TypeSet &);
TypeSet &operator=(const TypeSet &);
};
struct Verifier : public FunctionPass, public InstVisitor<Verifier> {
static char ID; // Pass ID, replacement for typeid
bool Broken; // Is this module found to be broken?
bool RealPass; // Are we not being run by a PassManager?
VerifierFailureAction action;
// What to do if verification fails.
Module *Mod; // Module we are verifying right now
DominatorTree *DT; // Dominator Tree, caution can be null!
std::string Messages;
raw_string_ostream MessagesStr;
/// InstInThisBlock - when verifying a basic block, keep track of all of the
/// instructions we have seen so far. This allows us to do efficient
/// dominance checks for the case when an instruction has an operand that is
/// an instruction in the same block.
SmallPtrSet<Instruction*, 16> InstsInThisBlock;
/// Types - keep track of the types that have been checked already.
TypeSet Types;
Verifier()
: FunctionPass(&ID),
Broken(false), RealPass(true), action(AbortProcessAction),
DT(0), MessagesStr(Messages) {}
explicit Verifier(VerifierFailureAction ctn)
: FunctionPass(&ID),
Broken(false), RealPass(true), action(ctn), DT(0),
MessagesStr(Messages) {}
explicit Verifier(bool AB)
: FunctionPass(&ID),
Broken(false), RealPass(true),
action( AB ? AbortProcessAction : PrintMessageAction), DT(0),
MessagesStr(Messages) {}
explicit Verifier(DominatorTree &dt)
: FunctionPass(&ID),
Broken(false), RealPass(false), action(PrintMessageAction),
DT(&dt), MessagesStr(Messages) {}
bool doInitialization(Module &M) {
Mod = &M;
verifyTypeSymbolTable(M.getTypeSymbolTable());
// If this is a real pass, in a pass manager, we must abort before
// returning back to the pass manager, or else the pass manager may try to
// run other passes on the broken module.
if (RealPass)
return abortIfBroken();
return false;
}
bool runOnFunction(Function &F) {
// Get dominator information if we are being run by PassManager
if (RealPass) DT = &getAnalysis<DominatorTree>();
Mod = F.getParent();
visit(F);
InstsInThisBlock.clear();
// If this is a real pass, in a pass manager, we must abort before
// returning back to the pass manager, or else the pass manager may try to
// run other passes on the broken module.
if (RealPass)
return abortIfBroken();
return false;
}
bool doFinalization(Module &M) {
// Scan through, checking all of the external function's linkage now...
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
visitGlobalValue(*I);
// Check to make sure function prototypes are okay.
if (I->isDeclaration()) visitFunction(*I);
}
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
visitGlobalVariable(*I);
for (Module::alias_iterator I = M.alias_begin(), E = M.alias_end();
I != E; ++I)
visitGlobalAlias(*I);
// If the module is broken, abort at this time.
return abortIfBroken();
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequiredID(PreVerifyID);
if (RealPass)
AU.addRequired<DominatorTree>();
}
/// abortIfBroken - If the module is broken and we are supposed to abort on
/// this condition, do so.
///
bool abortIfBroken() {
if (!Broken) return false;
MessagesStr << "Broken module found, ";
switch (action) {
default: llvm_unreachable("Unknown action");
case AbortProcessAction:
MessagesStr << "compilation aborted!\n";
dbgs() << MessagesStr.str();
// Client should choose different reaction if abort is not desired
abort();
case PrintMessageAction:
MessagesStr << "verification continues.\n";
dbgs() << MessagesStr.str();
return false;
case ReturnStatusAction:
MessagesStr << "compilation terminated.\n";
return true;
}
}
// Verification methods...
void verifyTypeSymbolTable(TypeSymbolTable &ST);
void visitGlobalValue(GlobalValue &GV);
void visitGlobalVariable(GlobalVariable &GV);
void visitGlobalAlias(GlobalAlias &GA);
void visitFunction(Function &F);
void visitBasicBlock(BasicBlock &BB);
using InstVisitor<Verifier>::visit;
void visit(Instruction &I);
void visitTruncInst(TruncInst &I);
void visitZExtInst(ZExtInst &I);
void visitSExtInst(SExtInst &I);
void visitFPTruncInst(FPTruncInst &I);
void visitFPExtInst(FPExtInst &I);
void visitFPToUIInst(FPToUIInst &I);
void visitFPToSIInst(FPToSIInst &I);
void visitUIToFPInst(UIToFPInst &I);
void visitSIToFPInst(SIToFPInst &I);
void visitIntToPtrInst(IntToPtrInst &I);
void visitPtrToIntInst(PtrToIntInst &I);
void visitBitCastInst(BitCastInst &I);
void visitPHINode(PHINode &PN);
void visitBinaryOperator(BinaryOperator &B);
void visitICmpInst(ICmpInst &IC);
void visitFCmpInst(FCmpInst &FC);
void visitExtractElementInst(ExtractElementInst &EI);
void visitInsertElementInst(InsertElementInst &EI);
void visitShuffleVectorInst(ShuffleVectorInst &EI);
void visitVAArgInst(VAArgInst &VAA) { visitInstruction(VAA); }
void visitCallInst(CallInst &CI);
void visitInvokeInst(InvokeInst &II);
void visitGetElementPtrInst(GetElementPtrInst &GEP);
void visitLoadInst(LoadInst &LI);
void visitStoreInst(StoreInst &SI);
void visitInstruction(Instruction &I);
void visitTerminatorInst(TerminatorInst &I);
void visitReturnInst(ReturnInst &RI);
void visitSwitchInst(SwitchInst &SI);
void visitSelectInst(SelectInst &SI);
void visitUserOp1(Instruction &I);
void visitUserOp2(Instruction &I) { visitUserOp1(I); }
void visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI);
void visitAllocaInst(AllocaInst &AI);
void visitExtractValueInst(ExtractValueInst &EVI);
void visitInsertValueInst(InsertValueInst &IVI);
void VerifyCallSite(CallSite CS);
bool PerformTypeCheck(Intrinsic::ID ID, Function *F, const Type *Ty,
int VT, unsigned ArgNo, std::string &Suffix);
void VerifyIntrinsicPrototype(Intrinsic::ID ID, Function *F,
unsigned RetNum, unsigned ParamNum, ...);
void VerifyFunctionLocalMetadata(MDNode *N, Function *F,
SmallPtrSet<MDNode *, 32> &Visited);
void VerifyParameterAttrs(Attributes Attrs, const Type *Ty,
bool isReturnValue, const Value *V);
void VerifyFunctionAttrs(const FunctionType *FT, const AttrListPtr &Attrs,
const Value *V);
void VerifyType(const Type *Ty);
void WriteValue(const Value *V) {
if (!V) return;
if (isa<Instruction>(V)) {
MessagesStr << *V << '\n';
} else {
WriteAsOperand(MessagesStr, V, true, Mod);
MessagesStr << '\n';
}
}
void WriteType(const Type *T) {
if (!T) return;
MessagesStr << ' ';
WriteTypeSymbolic(MessagesStr, T, Mod);
}
// CheckFailed - A check failed, so print out the condition and the message
// that failed. This provides a nice place to put a breakpoint if you want
// to see why something is not correct.
void CheckFailed(const Twine &Message,
const Value *V1 = 0, const Value *V2 = 0,
const Value *V3 = 0, const Value *V4 = 0) {
MessagesStr << Message.str() << "\n";
WriteValue(V1);
WriteValue(V2);
WriteValue(V3);
WriteValue(V4);
Broken = true;
}
void CheckFailed(const Twine &Message, const Value *V1,
const Type *T2, const Value *V3 = 0) {
MessagesStr << Message.str() << "\n";
WriteValue(V1);
WriteType(T2);
WriteValue(V3);
Broken = true;
}
void CheckFailed(const Twine &Message, const Type *T1,
const Type *T2 = 0, const Type *T3 = 0) {
MessagesStr << Message.str() << "\n";
WriteType(T1);
WriteType(T2);
WriteType(T3);
Broken = true;
}
};
} // End anonymous namespace
char Verifier::ID = 0;
static RegisterPass<Verifier> X("verify", "Module Verifier");
// Assert - We know that cond should be true, if not print an error message.
#define Assert(C, M) \
do { if (!(C)) { CheckFailed(M); return; } } while (0)
#define Assert1(C, M, V1) \
do { if (!(C)) { CheckFailed(M, V1); return; } } while (0)
#define Assert2(C, M, V1, V2) \
do { if (!(C)) { CheckFailed(M, V1, V2); return; } } while (0)
#define Assert3(C, M, V1, V2, V3) \
do { if (!(C)) { CheckFailed(M, V1, V2, V3); return; } } while (0)
#define Assert4(C, M, V1, V2, V3, V4) \
do { if (!(C)) { CheckFailed(M, V1, V2, V3, V4); return; } } while (0)
void Verifier::visit(Instruction &I) {
for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
Assert1(I.getOperand(i) != 0, "Operand is null", &I);
InstVisitor<Verifier>::visit(I);
}
void Verifier::visitGlobalValue(GlobalValue &GV) {
Assert1(!GV.isDeclaration() ||
GV.isMaterializable() ||
GV.hasExternalLinkage() ||
GV.hasDLLImportLinkage() ||
GV.hasExternalWeakLinkage() ||
(isa<GlobalAlias>(GV) &&
(GV.hasLocalLinkage() || GV.hasWeakLinkage())),
"Global is external, but doesn't have external or dllimport or weak linkage!",
&GV);
Assert1(!GV.hasDLLImportLinkage() || GV.isDeclaration(),
"Global is marked as dllimport, but not external", &GV);
Assert1(!GV.hasAppendingLinkage() || isa<GlobalVariable>(GV),
"Only global variables can have appending linkage!", &GV);
if (GV.hasAppendingLinkage()) {
GlobalVariable *GVar = dyn_cast<GlobalVariable>(&GV);
Assert1(GVar && isa<ArrayType>(GVar->getType()->getElementType()),
"Only global arrays can have appending linkage!", GVar);
}
}
void Verifier::visitGlobalVariable(GlobalVariable &GV) {
if (GV.hasInitializer()) {
Assert1(GV.getInitializer()->getType() == GV.getType()->getElementType(),
"Global variable initializer type does not match global "
"variable type!", &GV);
// If the global has common linkage, it must have a zero initializer and
// cannot be constant.
if (GV.hasCommonLinkage()) {
Assert1(GV.getInitializer()->isNullValue(),
"'common' global must have a zero initializer!", &GV);
Assert1(!GV.isConstant(), "'common' global may not be marked constant!",
&GV);
}
} else {
Assert1(GV.hasExternalLinkage() || GV.hasDLLImportLinkage() ||
GV.hasExternalWeakLinkage(),
"invalid linkage type for global declaration", &GV);
}
visitGlobalValue(GV);
}
void Verifier::visitGlobalAlias(GlobalAlias &GA) {
Assert1(!GA.getName().empty(),
"Alias name cannot be empty!", &GA);
Assert1(GA.hasExternalLinkage() || GA.hasLocalLinkage() ||
GA.hasWeakLinkage(),
"Alias should have external or external weak linkage!", &GA);
Assert1(GA.getAliasee(),
"Aliasee cannot be NULL!", &GA);
Assert1(GA.getType() == GA.getAliasee()->getType(),
"Alias and aliasee types should match!", &GA);
if (!isa<GlobalValue>(GA.getAliasee())) {
const ConstantExpr *CE = dyn_cast<ConstantExpr>(GA.getAliasee());
Assert1(CE &&
(CE->getOpcode() == Instruction::BitCast ||
CE->getOpcode() == Instruction::GetElementPtr) &&
isa<GlobalValue>(CE->getOperand(0)),
"Aliasee should be either GlobalValue or bitcast of GlobalValue",
&GA);
}
const GlobalValue* Aliasee = GA.resolveAliasedGlobal(/*stopOnWeak*/ false);
Assert1(Aliasee,
"Aliasing chain should end with function or global variable", &GA);
visitGlobalValue(GA);
}
void Verifier::verifyTypeSymbolTable(TypeSymbolTable &ST) {
for (TypeSymbolTable::iterator I = ST.begin(), E = ST.end(); I != E; ++I)
VerifyType(I->second);
}
// VerifyParameterAttrs - Check the given attributes for an argument or return
// value of the specified type. The value V is printed in error messages.
void Verifier::VerifyParameterAttrs(Attributes Attrs, const Type *Ty,
bool isReturnValue, const Value *V) {
if (Attrs == Attribute::None)
return;
Attributes FnCheckAttr = Attrs & Attribute::FunctionOnly;
Assert1(!FnCheckAttr, "Attribute " + Attribute::getAsString(FnCheckAttr) +
" only applies to the function!", V);
if (isReturnValue) {
Attributes RetI = Attrs & Attribute::ParameterOnly;
Assert1(!RetI, "Attribute " + Attribute::getAsString(RetI) +
" does not apply to return values!", V);
}
for (unsigned i = 0;
i < array_lengthof(Attribute::MutuallyIncompatible); ++i) {
Attributes MutI = Attrs & Attribute::MutuallyIncompatible[i];
Assert1(!(MutI & (MutI - 1)), "Attributes " +
Attribute::getAsString(MutI) + " are incompatible!", V);
}
Attributes TypeI = Attrs & Attribute::typeIncompatible(Ty);
Assert1(!TypeI, "Wrong type for attribute " +
Attribute::getAsString(TypeI), V);
Attributes ByValI = Attrs & Attribute::ByVal;
if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) {
Assert1(!ByValI || PTy->getElementType()->isSized(),
"Attribute " + Attribute::getAsString(ByValI) +
" does not support unsized types!", V);
} else {
Assert1(!ByValI,
"Attribute " + Attribute::getAsString(ByValI) +
" only applies to parameters with pointer type!", V);
}
}
// VerifyFunctionAttrs - Check parameter attributes against a function type.
// The value V is printed in error messages.
void Verifier::VerifyFunctionAttrs(const FunctionType *FT,
const AttrListPtr &Attrs,
const Value *V) {
if (Attrs.isEmpty())
return;
bool SawNest = false;
for (unsigned i = 0, e = Attrs.getNumSlots(); i != e; ++i) {
const AttributeWithIndex &Attr = Attrs.getSlot(i);
const Type *Ty;
if (Attr.Index == 0)
Ty = FT->getReturnType();
else if (Attr.Index-1 < FT->getNumParams())
Ty = FT->getParamType(Attr.Index-1);
else
break; // VarArgs attributes, verified elsewhere.
VerifyParameterAttrs(Attr.Attrs, Ty, Attr.Index == 0, V);
if (Attr.Attrs & Attribute::Nest) {
Assert1(!SawNest, "More than one parameter has attribute nest!", V);
SawNest = true;
}
if (Attr.Attrs & Attribute::StructRet)
Assert1(Attr.Index == 1, "Attribute sret not on first parameter!", V);
}
Attributes FAttrs = Attrs.getFnAttributes();
Attributes NotFn = FAttrs & (~Attribute::FunctionOnly);
Assert1(!NotFn, "Attribute " + Attribute::getAsString(NotFn) +
" does not apply to the function!", V);
for (unsigned i = 0;
i < array_lengthof(Attribute::MutuallyIncompatible); ++i) {
Attributes MutI = FAttrs & Attribute::MutuallyIncompatible[i];
Assert1(!(MutI & (MutI - 1)), "Attributes " +
Attribute::getAsString(MutI) + " are incompatible!", V);
}
}
static bool VerifyAttributeCount(const AttrListPtr &Attrs, unsigned Params) {
if (Attrs.isEmpty())
return true;
unsigned LastSlot = Attrs.getNumSlots() - 1;
unsigned LastIndex = Attrs.getSlot(LastSlot).Index;
if (LastIndex <= Params
|| (LastIndex == (unsigned)~0
&& (LastSlot == 0 || Attrs.getSlot(LastSlot - 1).Index <= Params)))
return true;
return false;
}
// visitFunction - Verify that a function is ok.
//
void Verifier::visitFunction(Function &F) {
// Check function arguments.
const FunctionType *FT = F.getFunctionType();
unsigned NumArgs = F.arg_size();
Assert1(!F.hasCommonLinkage(), "Functions may not have common linkage", &F);
Assert2(FT->getNumParams() == NumArgs,
"# formal arguments must match # of arguments for function type!",
&F, FT);
Assert1(F.getReturnType()->isFirstClassType() ||
F.getReturnType()->isVoidTy() ||
isa<StructType>(F.getReturnType()),
"Functions cannot return aggregate values!", &F);
Assert1(!F.hasStructRetAttr() || F.getReturnType()->isVoidTy(),
"Invalid struct return type!", &F);
const AttrListPtr &Attrs = F.getAttributes();
Assert1(VerifyAttributeCount(Attrs, FT->getNumParams()),
"Attributes after last parameter!", &F);
// Check function attributes.
VerifyFunctionAttrs(FT, Attrs, &F);
// Check that this function meets the restrictions on this calling convention.
switch (F.getCallingConv()) {
default:
break;
case CallingConv::C:
break;
case CallingConv::Fast:
case CallingConv::Cold:
case CallingConv::X86_FastCall:
Assert1(!F.isVarArg(),
"Varargs functions must have C calling conventions!", &F);
break;
}
bool isLLVMdotName = F.getName().size() >= 5 &&
F.getName().substr(0, 5) == "llvm.";
// Check that the argument values match the function type for this function...
unsigned i = 0;
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end();
I != E; ++I, ++i) {
Assert2(I->getType() == FT->getParamType(i),
"Argument value does not match function argument type!",
I, FT->getParamType(i));
Assert1(I->getType()->isFirstClassType(),
"Function arguments must have first-class types!", I);
if (!isLLVMdotName)
Assert2(!I->getType()->isMetadataTy(),
"Function takes metadata but isn't an intrinsic", I, &F);
}
if (F.isMaterializable()) {
// Function has a body somewhere we can't see.
} else if (F.isDeclaration()) {
Assert1(F.hasExternalLinkage() || F.hasDLLImportLinkage() ||
F.hasExternalWeakLinkage(),
"invalid linkage type for function declaration", &F);
} else {
// Verify that this function (which has a body) is not named "llvm.*". It
// is not legal to define intrinsics.
Assert1(!isLLVMdotName, "llvm intrinsics cannot be defined!", &F);
// Check the entry node
BasicBlock *Entry = &F.getEntryBlock();
Assert1(pred_begin(Entry) == pred_end(Entry),
"Entry block to function must not have predecessors!", Entry);
// The address of the entry block cannot be taken, unless it is dead.
if (Entry->hasAddressTaken()) {
Assert1(!BlockAddress::get(Entry)->isConstantUsed(),
"blockaddress may not be used with the entry block!", Entry);
}
}
// If this function is actually an intrinsic, verify that it is only used in
// direct call/invokes, never having its "address taken".
if (F.getIntrinsicID()) {
for (Value::use_iterator UI = F.use_begin(), E = F.use_end(); UI != E;++UI){
User *U = cast<User>(UI);
if ((isa<CallInst>(U) || isa<InvokeInst>(U)) && UI.getOperandNo() == 0)
continue; // Direct calls/invokes are ok.
Assert1(0, "Invalid user of intrinsic instruction!", U);
}
}
}
// verifyBasicBlock - Verify that a basic block is well formed...
//
void Verifier::visitBasicBlock(BasicBlock &BB) {
InstsInThisBlock.clear();
// Ensure that basic blocks have terminators!
Assert1(BB.getTerminator(), "Basic Block does not have terminator!", &BB);
// Check constraints that this basic block imposes on all of the PHI nodes in
// it.
if (isa<PHINode>(BB.front())) {
SmallVector<BasicBlock*, 8> Preds(pred_begin(&BB), pred_end(&BB));
SmallVector<std::pair<BasicBlock*, Value*>, 8> Values;
std::sort(Preds.begin(), Preds.end());
PHINode *PN;
for (BasicBlock::iterator I = BB.begin(); (PN = dyn_cast<PHINode>(I));++I) {
// Ensure that PHI nodes have at least one entry!
Assert1(PN->getNumIncomingValues() != 0,
"PHI nodes must have at least one entry. If the block is dead, "
"the PHI should be removed!", PN);
Assert1(PN->getNumIncomingValues() == Preds.size(),
"PHINode should have one entry for each predecessor of its "
"parent basic block!", PN);
// Get and sort all incoming values in the PHI node...
Values.clear();
Values.reserve(PN->getNumIncomingValues());
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
Values.push_back(std::make_pair(PN->getIncomingBlock(i),
PN->getIncomingValue(i)));
std::sort(Values.begin(), Values.end());
for (unsigned i = 0, e = Values.size(); i != e; ++i) {
// Check to make sure that if there is more than one entry for a
// particular basic block in this PHI node, that the incoming values are
// all identical.
//
Assert4(i == 0 || Values[i].first != Values[i-1].first ||
Values[i].second == Values[i-1].second,
"PHI node has multiple entries for the same basic block with "
"different incoming values!", PN, Values[i].first,
Values[i].second, Values[i-1].second);
// Check to make sure that the predecessors and PHI node entries are
// matched up.
Assert3(Values[i].first == Preds[i],
"PHI node entries do not match predecessors!", PN,
Values[i].first, Preds[i]);
}
}
}
}
void Verifier::visitTerminatorInst(TerminatorInst &I) {
// Ensure that terminators only exist at the end of the basic block.
Assert1(&I == I.getParent()->getTerminator(),
"Terminator found in the middle of a basic block!", I.getParent());
visitInstruction(I);
}
void Verifier::visitReturnInst(ReturnInst &RI) {
Function *F = RI.getParent()->getParent();
unsigned N = RI.getNumOperands();
if (F->getReturnType()->isVoidTy())
Assert2(N == 0,
"Found return instr that returns non-void in Function of void "
"return type!", &RI, F->getReturnType());
else if (N == 1 && F->getReturnType() == RI.getOperand(0)->getType()) {
// Exactly one return value and it matches the return type. Good.
} else if (const StructType *STy = dyn_cast<StructType>(F->getReturnType())) {
// The return type is a struct; check for multiple return values.
Assert2(STy->getNumElements() == N,
"Incorrect number of return values in ret instruction!",
&RI, F->getReturnType());
for (unsigned i = 0; i != N; ++i)
Assert2(STy->getElementType(i) == RI.getOperand(i)->getType(),
"Function return type does not match operand "
"type of return inst!", &RI, F->getReturnType());
} else if (const ArrayType *ATy = dyn_cast<ArrayType>(F->getReturnType())) {
// The return type is an array; check for multiple return values.
Assert2(ATy->getNumElements() == N,
"Incorrect number of return values in ret instruction!",
&RI, F->getReturnType());
for (unsigned i = 0; i != N; ++i)
Assert2(ATy->getElementType() == RI.getOperand(i)->getType(),
"Function return type does not match operand "
"type of return inst!", &RI, F->getReturnType());
} else {
CheckFailed("Function return type does not match operand "
"type of return inst!", &RI, F->getReturnType());
}
// Check to make sure that the return value has necessary properties for
// terminators...
visitTerminatorInst(RI);
}
void Verifier::visitSwitchInst(SwitchInst &SI) {
// Check to make sure that all of the constants in the switch instruction
// have the same type as the switched-on value.
const Type *SwitchTy = SI.getCondition()->getType();
SmallPtrSet<ConstantInt*, 32> Constants;
for (unsigned i = 1, e = SI.getNumCases(); i != e; ++i) {
Assert1(SI.getCaseValue(i)->getType() == SwitchTy,
"Switch constants must all be same type as switch value!", &SI);
Assert2(Constants.insert(SI.getCaseValue(i)),
"Duplicate integer as switch case", &SI, SI.getCaseValue(i));
}
visitTerminatorInst(SI);
}
void Verifier::visitSelectInst(SelectInst &SI) {
Assert1(!SelectInst::areInvalidOperands(SI.getOperand(0), SI.getOperand(1),
SI.getOperand(2)),
"Invalid operands for select instruction!", &SI);
Assert1(SI.getTrueValue()->getType() == SI.getType(),
"Select values must have same type as select instruction!", &SI);
visitInstruction(SI);
}
/// visitUserOp1 - User defined operators shouldn't live beyond the lifetime of
/// a pass, if any exist, it's an error.
///
void Verifier::visitUserOp1(Instruction &I) {
Assert1(0, "User-defined operators should not live outside of a pass!", &I);
}
void Verifier::visitTruncInst(TruncInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
// Get the size of the types in bits, we'll need this later
unsigned SrcBitSize = SrcTy->getScalarSizeInBits();
unsigned DestBitSize = DestTy->getScalarSizeInBits();
Assert1(SrcTy->isIntOrIntVector(), "Trunc only operates on integer", &I);
Assert1(DestTy->isIntOrIntVector(), "Trunc only produces integer", &I);
Assert1(isa<VectorType>(SrcTy) == isa<VectorType>(DestTy),
"trunc source and destination must both be a vector or neither", &I);
Assert1(SrcBitSize > DestBitSize,"DestTy too big for Trunc", &I);
visitInstruction(I);
}
void Verifier::visitZExtInst(ZExtInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
// Get the size of the types in bits, we'll need this later
Assert1(SrcTy->isIntOrIntVector(), "ZExt only operates on integer", &I);
Assert1(DestTy->isIntOrIntVector(), "ZExt only produces an integer", &I);
Assert1(isa<VectorType>(SrcTy) == isa<VectorType>(DestTy),
"zext source and destination must both be a vector or neither", &I);
unsigned SrcBitSize = SrcTy->getScalarSizeInBits();
unsigned DestBitSize = DestTy->getScalarSizeInBits();
Assert1(SrcBitSize < DestBitSize,"Type too small for ZExt", &I);
visitInstruction(I);
}
void Verifier::visitSExtInst(SExtInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
// Get the size of the types in bits, we'll need this later
unsigned SrcBitSize = SrcTy->getScalarSizeInBits();
unsigned DestBitSize = DestTy->getScalarSizeInBits();
Assert1(SrcTy->isIntOrIntVector(), "SExt only operates on integer", &I);
Assert1(DestTy->isIntOrIntVector(), "SExt only produces an integer", &I);
Assert1(isa<VectorType>(SrcTy) == isa<VectorType>(DestTy),
"sext source and destination must both be a vector or neither", &I);
Assert1(SrcBitSize < DestBitSize,"Type too small for SExt", &I);
visitInstruction(I);
}
void Verifier::visitFPTruncInst(FPTruncInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
// Get the size of the types in bits, we'll need this later
unsigned SrcBitSize = SrcTy->getScalarSizeInBits();
unsigned DestBitSize = DestTy->getScalarSizeInBits();
Assert1(SrcTy->isFPOrFPVector(),"FPTrunc only operates on FP", &I);
Assert1(DestTy->isFPOrFPVector(),"FPTrunc only produces an FP", &I);
Assert1(isa<VectorType>(SrcTy) == isa<VectorType>(DestTy),
"fptrunc source and destination must both be a vector or neither",&I);
Assert1(SrcBitSize > DestBitSize,"DestTy too big for FPTrunc", &I);
visitInstruction(I);
}
void Verifier::visitFPExtInst(FPExtInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
// Get the size of the types in bits, we'll need this later
unsigned SrcBitSize = SrcTy->getScalarSizeInBits();
unsigned DestBitSize = DestTy->getScalarSizeInBits();
Assert1(SrcTy->isFPOrFPVector(),"FPExt only operates on FP", &I);
Assert1(DestTy->isFPOrFPVector(),"FPExt only produces an FP", &I);
Assert1(isa<VectorType>(SrcTy) == isa<VectorType>(DestTy),
"fpext source and destination must both be a vector or neither", &I);
Assert1(SrcBitSize < DestBitSize,"DestTy too small for FPExt", &I);
visitInstruction(I);
}
void Verifier::visitUIToFPInst(UIToFPInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
bool SrcVec = isa<VectorType>(SrcTy);
bool DstVec = isa<VectorType>(DestTy);
Assert1(SrcVec == DstVec,
"UIToFP source and dest must both be vector or scalar", &I);
Assert1(SrcTy->isIntOrIntVector(),
"UIToFP source must be integer or integer vector", &I);
Assert1(DestTy->isFPOrFPVector(),
"UIToFP result must be FP or FP vector", &I);
if (SrcVec && DstVec)
Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
cast<VectorType>(DestTy)->getNumElements(),
"UIToFP source and dest vector length mismatch", &I);
visitInstruction(I);
}
void Verifier::visitSIToFPInst(SIToFPInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
bool SrcVec = isa<VectorType>(SrcTy);
bool DstVec = isa<VectorType>(DestTy);
Assert1(SrcVec == DstVec,
"SIToFP source and dest must both be vector or scalar", &I);
Assert1(SrcTy->isIntOrIntVector(),
"SIToFP source must be integer or integer vector", &I);
Assert1(DestTy->isFPOrFPVector(),
"SIToFP result must be FP or FP vector", &I);
if (SrcVec && DstVec)
Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
cast<VectorType>(DestTy)->getNumElements(),
"SIToFP source and dest vector length mismatch", &I);
visitInstruction(I);
}
void Verifier::visitFPToUIInst(FPToUIInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
bool SrcVec = isa<VectorType>(SrcTy);
bool DstVec = isa<VectorType>(DestTy);
Assert1(SrcVec == DstVec,
"FPToUI source and dest must both be vector or scalar", &I);
Assert1(SrcTy->isFPOrFPVector(), "FPToUI source must be FP or FP vector", &I);
Assert1(DestTy->isIntOrIntVector(),
"FPToUI result must be integer or integer vector", &I);
if (SrcVec && DstVec)
Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
cast<VectorType>(DestTy)->getNumElements(),
"FPToUI source and dest vector length mismatch", &I);
visitInstruction(I);
}
void Verifier::visitFPToSIInst(FPToSIInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
bool SrcVec = isa<VectorType>(SrcTy);
bool DstVec = isa<VectorType>(DestTy);
Assert1(SrcVec == DstVec,
"FPToSI source and dest must both be vector or scalar", &I);
Assert1(SrcTy->isFPOrFPVector(),
"FPToSI source must be FP or FP vector", &I);
Assert1(DestTy->isIntOrIntVector(),
"FPToSI result must be integer or integer vector", &I);
if (SrcVec && DstVec)
Assert1(cast<VectorType>(SrcTy)->getNumElements() ==
cast<VectorType>(DestTy)->getNumElements(),
"FPToSI source and dest vector length mismatch", &I);
visitInstruction(I);
}
void Verifier::visitPtrToIntInst(PtrToIntInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
Assert1(isa<PointerType>(SrcTy), "PtrToInt source must be pointer", &I);
Assert1(DestTy->isInteger(), "PtrToInt result must be integral", &I);
visitInstruction(I);
}
void Verifier::visitIntToPtrInst(IntToPtrInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
Assert1(SrcTy->isInteger(), "IntToPtr source must be an integral", &I);
Assert1(isa<PointerType>(DestTy), "IntToPtr result must be a pointer",&I);
visitInstruction(I);
}
void Verifier::visitBitCastInst(BitCastInst &I) {
// Get the source and destination types
const Type *SrcTy = I.getOperand(0)->getType();
const Type *DestTy = I.getType();
// Get the size of the types in bits, we'll need this later
unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
unsigned DestBitSize = DestTy->getPrimitiveSizeInBits();
// BitCast implies a no-op cast of type only. No bits change.
// However, you can't cast pointers to anything but pointers.
Assert1(isa<PointerType>(DestTy) == isa<PointerType>(DestTy),
"Bitcast requires both operands to be pointer or neither", &I);
Assert1(SrcBitSize == DestBitSize, "Bitcast requires types of same width",&I);
// Disallow aggregates.
Assert1(!SrcTy->isAggregateType(),
"Bitcast operand must not be aggregate", &I);
Assert1(!DestTy->isAggregateType(),
"Bitcast type must not be aggregate", &I);
visitInstruction(I);
}
/// visitPHINode - Ensure that a PHI node is well formed.
///
void Verifier::visitPHINode(PHINode &PN) {
// Ensure that the PHI nodes are all grouped together at the top of the block.
// This can be tested by checking whether the instruction before this is
// either nonexistent (because this is begin()) or is a PHI node. If not,
// then there is some other instruction before a PHI.
Assert2(&PN == &PN.getParent()->front() ||
isa<PHINode>(--BasicBlock::iterator(&PN)),
"PHI nodes not grouped at top of basic block!",
&PN, PN.getParent());
// Check that all of the values of the PHI node have the same type as the
// result, and that the incoming blocks are really basic blocks.
for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
Assert1(PN.getType() == PN.getIncomingValue(i)->getType(),
"PHI node operands are not the same type as the result!", &PN);
Assert1(isa<BasicBlock>(PN.getOperand(
PHINode::getOperandNumForIncomingBlock(i))),
"PHI node incoming block is not a BasicBlock!", &PN);
}
// All other PHI node constraints are checked in the visitBasicBlock method.
visitInstruction(PN);
}
void Verifier::VerifyCallSite(CallSite CS) {
Instruction *I = CS.getInstruction();
Assert1(isa<PointerType>(CS.getCalledValue()->getType()),
"Called function must be a pointer!", I);
const PointerType *FPTy = cast<PointerType>(CS.getCalledValue()->getType());
Assert1(isa<FunctionType>(FPTy->getElementType()),
"Called function is not pointer to function type!", I);
const FunctionType *FTy = cast<FunctionType>(FPTy->getElementType());
// Verify that the correct number of arguments are being passed
if (FTy->isVarArg())
Assert1(CS.arg_size() >= FTy->getNumParams(),
"Called function requires more parameters than were provided!",I);
else
Assert1(CS.arg_size() == FTy->getNumParams(),
"Incorrect number of arguments passed to called function!", I);
// Verify that all arguments to the call match the function type...
for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
Assert3(CS.getArgument(i)->getType() == FTy->getParamType(i),
"Call parameter type does not match function signature!",
CS.getArgument(i), FTy->getParamType(i), I);
const AttrListPtr &Attrs = CS.getAttributes();
Assert1(VerifyAttributeCount(Attrs, CS.arg_size()),
"Attributes after last parameter!", I);
// Verify call attributes.
VerifyFunctionAttrs(FTy, Attrs, I);
if (FTy->isVarArg())
// Check attributes on the varargs part.
for (unsigned Idx = 1 + FTy->getNumParams(); Idx <= CS.arg_size(); ++Idx) {
Attributes Attr = Attrs.getParamAttributes(Idx);
VerifyParameterAttrs(Attr, CS.getArgument(Idx-1)->getType(), false, I);
Attributes VArgI = Attr & Attribute::VarArgsIncompatible;
Assert1(!VArgI, "Attribute " + Attribute::getAsString(VArgI) +
" cannot be used for vararg call arguments!", I);
}
// Verify that there's no metadata unless it's a direct call to an intrinsic.
if (!CS.getCalledFunction() || CS.getCalledFunction()->getName().size() < 5 ||
CS.getCalledFunction()->getName().substr(0, 5) != "llvm.") {
for (FunctionType::param_iterator PI = FTy->param_begin(),
PE = FTy->param_end(); PI != PE; ++PI)
Assert1(!PI->get()->isMetadataTy(),
"Function has metadata parameter but isn't an intrinsic", I);
}
visitInstruction(*I);
}
void Verifier::visitCallInst(CallInst &CI) {
VerifyCallSite(&CI);
if (Function *F = CI.getCalledFunction())
if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
visitIntrinsicFunctionCall(ID, CI);
}
void Verifier::visitInvokeInst(InvokeInst &II) {
VerifyCallSite(&II);
}
/// visitBinaryOperator - Check that both arguments to the binary operator are
/// of the same type!
///
void Verifier::visitBinaryOperator(BinaryOperator &B) {
Assert1(B.getOperand(0)->getType() == B.getOperand(1)->getType(),
"Both operands to a binary operator are not of the same type!", &B);
switch (B.getOpcode()) {
// Check that integer arithmetic operators are only used with
// integral operands.
case Instruction::Add:
case Instruction::Sub:
case Instruction::Mul:
case Instruction::SDiv:
case Instruction::UDiv:
case Instruction::SRem:
case Instruction::URem:
Assert1(B.getType()->isIntOrIntVector(),
"Integer arithmetic operators only work with integral types!", &B);
Assert1(B.getType() == B.getOperand(0)->getType(),
"Integer arithmetic operators must have same type "
"for operands and result!", &B);
break;
// Check that floating-point arithmetic operators are only used with
// floating-point operands.
case Instruction::FAdd:
case Instruction::FSub:
case Instruction::FMul:
case Instruction::FDiv:
case Instruction::FRem:
Assert1(B.getType()->isFPOrFPVector(),
"Floating-point arithmetic operators only work with "
"floating-point types!", &B);
Assert1(B.getType() == B.getOperand(0)->getType(),
"Floating-point arithmetic operators must have same type "
"for operands and result!", &B);
break;
// Check that logical operators are only used with integral operands.
case Instruction::And:
case Instruction::Or:
case Instruction::Xor:
Assert1(B.getType()->isIntOrIntVector(),
"Logical operators only work with integral types!", &B);
Assert1(B.getType() == B.getOperand(0)->getType(),
"Logical operators must have same type for operands and result!",
&B);
break;
case Instruction::Shl:
case Instruction::LShr:
case Instruction::AShr:
Assert1(B.getType()->isIntOrIntVector(),
"Shifts only work with integral types!", &B);
Assert1(B.getType() == B.getOperand(0)->getType(),
"Shift return type must be same as operands!", &B);
break;
default:
llvm_unreachable("Unknown BinaryOperator opcode!");
}
visitInstruction(B);
}
void Verifier::visitICmpInst(ICmpInst& IC) {
// Check that the operands are the same type
const Type* Op0Ty = IC.getOperand(0)->getType();
const Type* Op1Ty = IC.getOperand(1)->getType();
Assert1(Op0Ty == Op1Ty,
"Both operands to ICmp instruction are not of the same type!", &IC);
// Check that the operands are the right type
Assert1(Op0Ty->isIntOrIntVector() || isa<PointerType>(Op0Ty),
"Invalid operand types for ICmp instruction", &IC);
visitInstruction(IC);
}
void Verifier::visitFCmpInst(FCmpInst& FC) {
// Check that the operands are the same type
const Type* Op0Ty = FC.getOperand(0)->getType();
const Type* Op1Ty = FC.getOperand(1)->getType();
Assert1(Op0Ty == Op1Ty,
"Both operands to FCmp instruction are not of the same type!", &FC);
// Check that the operands are the right type
Assert1(Op0Ty->isFPOrFPVector(),
"Invalid operand types for FCmp instruction", &FC);
visitInstruction(FC);
}
void Verifier::visitExtractElementInst(ExtractElementInst &EI) {
Assert1(ExtractElementInst::isValidOperands(EI.getOperand(0),
EI.getOperand(1)),
"Invalid extractelement operands!", &EI);
visitInstruction(EI);
}
void Verifier::visitInsertElementInst(InsertElementInst &IE) {
Assert1(InsertElementInst::isValidOperands(IE.getOperand(0),
IE.getOperand(1),
IE.getOperand(2)),
"Invalid insertelement operands!", &IE);
visitInstruction(IE);
}
void Verifier::visitShuffleVectorInst(ShuffleVectorInst &SV) {
Assert1(ShuffleVectorInst::isValidOperands(SV.getOperand(0), SV.getOperand(1),
SV.getOperand(2)),
"Invalid shufflevector operands!", &SV);
const VectorType *VTy = dyn_cast<VectorType>(SV.getOperand(0)->getType());
Assert1(VTy, "Operands are not a vector type", &SV);
// Check to see if Mask is valid.
if (const ConstantVector *MV = dyn_cast<ConstantVector>(SV.getOperand(2))) {
for (unsigned i = 0, e = MV->getNumOperands(); i != e; ++i) {
if (ConstantInt* CI = dyn_cast<ConstantInt>(MV->getOperand(i))) {
Assert1(!CI->uge(VTy->getNumElements()*2),
"Invalid shufflevector shuffle mask!", &SV);
} else {
Assert1(isa<UndefValue>(MV->getOperand(i)),
"Invalid shufflevector shuffle mask!", &SV);
}
}
} else {
Assert1(isa<UndefValue>(SV.getOperand(2)) ||
isa<ConstantAggregateZero>(SV.getOperand(2)),
"Invalid shufflevector shuffle mask!", &SV);
}
visitInstruction(SV);
}
void Verifier::visitGetElementPtrInst(GetElementPtrInst &GEP) {
SmallVector<Value*, 16> Idxs(GEP.idx_begin(), GEP.idx_end());
const Type *ElTy =
GetElementPtrInst::getIndexedType(GEP.getOperand(0)->getType(),
Idxs.begin(), Idxs.end());
Assert1(ElTy, "Invalid indices for GEP pointer type!", &GEP);
Assert2(isa<PointerType>(GEP.getType()) &&
cast<PointerType>(GEP.getType())->getElementType() == ElTy,
"GEP is not of right type for indices!", &GEP, ElTy);
visitInstruction(GEP);
}
void Verifier::visitLoadInst(LoadInst &LI) {
const PointerType *PTy = dyn_cast<PointerType>(LI.getOperand(0)->getType());
Assert1(PTy, "Load operand must be a pointer.", &LI);
const Type *ElTy = PTy->getElementType();
Assert2(ElTy == LI.getType(),
"Load result type does not match pointer operand type!", &LI, ElTy);
visitInstruction(LI);
}
void Verifier::visitStoreInst(StoreInst &SI) {
const PointerType *PTy = dyn_cast<PointerType>(SI.getOperand(1)->getType());
Assert1(PTy, "Load operand must be a pointer.", &SI);
const Type *ElTy = PTy->getElementType();
Assert2(ElTy == SI.getOperand(0)->getType(),
"Stored value type does not match pointer operand type!",
&SI, ElTy);
visitInstruction(SI);
}
void Verifier::visitAllocaInst(AllocaInst &AI) {
const PointerType *PTy = AI.getType();
Assert1(PTy->getAddressSpace() == 0,
"Allocation instruction pointer not in the generic address space!",
&AI);
Assert1(PTy->getElementType()->isSized(), "Cannot allocate unsized type",
&AI);
Assert1(AI.getArraySize()->getType()->isInteger(32),
"Alloca array size must be i32", &AI);
visitInstruction(AI);
}
void Verifier::visitExtractValueInst(ExtractValueInst &EVI) {
Assert1(ExtractValueInst::getIndexedType(EVI.getAggregateOperand()->getType(),
EVI.idx_begin(), EVI.idx_end()) ==
EVI.getType(),
"Invalid ExtractValueInst operands!", &EVI);
visitInstruction(EVI);
}
void Verifier::visitInsertValueInst(InsertValueInst &IVI) {
Assert1(ExtractValueInst::getIndexedType(IVI.getAggregateOperand()->getType(),
IVI.idx_begin(), IVI.idx_end()) ==
IVI.getOperand(1)->getType(),
"Invalid InsertValueInst operands!", &IVI);
visitInstruction(IVI);
}
/// verifyInstruction - Verify that an instruction is well formed.
///
void Verifier::visitInstruction(Instruction &I) {
BasicBlock *BB = I.getParent();
Assert1(BB, "Instruction not embedded in basic block!", &I);
if (!isa<PHINode>(I)) { // Check that non-phi nodes are not self referential
for (Value::use_iterator UI = I.use_begin(), UE = I.use_end();
UI != UE; ++UI)
Assert1(*UI != (User*)&I || !DT->isReachableFromEntry(BB),
"Only PHI nodes may reference their own value!", &I);
}
// Verify that if this is a terminator that it is at the end of the block.
if (isa<TerminatorInst>(I))
Assert1(BB->getTerminator() == &I, "Terminator not at end of block!", &I);
// Check that void typed values don't have names
Assert1(!I.getType()->isVoidTy() || !I.hasName(),
"Instruction has a name, but provides a void value!", &I);
// Check that the return value of the instruction is either void or a legal
// value type.
Assert1(I.getType()->isVoidTy() ||
I.getType()->isFirstClassType(),
"Instruction returns a non-scalar type!", &I);
// Check that the instruction doesn't produce metadata. Calls are already
// checked against the callee type.
Assert1(!I.getType()->isMetadataTy() ||
isa<CallInst>(I) || isa<InvokeInst>(I),
"Invalid use of metadata!", &I);
// Check that all uses of the instruction, if they are instructions
// themselves, actually have parent basic blocks. If the use is not an
// instruction, it is an error!
for (User::use_iterator UI = I.use_begin(), UE = I.use_end();
UI != UE; ++UI) {
if (Instruction *Used = dyn_cast<Instruction>(*UI))
Assert2(Used->getParent() != 0, "Instruction referencing instruction not"
" embedded in a basic block!", &I, Used);
else {
CheckFailed("Use of instruction is not an instruction!", *UI);
return;
}
}
for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
Assert1(I.getOperand(i) != 0, "Instruction has null operand!", &I);
// Check to make sure that only first-class-values are operands to
// instructions.
if (!I.getOperand(i)->getType()->isFirstClassType()) {
Assert1(0, "Instruction operands must be first-class values!", &I);
}
if (Function *F = dyn_cast<Function>(I.getOperand(i))) {
// Check to make sure that the "address of" an intrinsic function is never
// taken.
Assert1(!F->isIntrinsic() || (i == 0 && isa<CallInst>(I)),
"Cannot take the address of an intrinsic!", &I);
Assert1(F->getParent() == Mod, "Referencing function in another module!",
&I);
} else if (BasicBlock *OpBB = dyn_cast<BasicBlock>(I.getOperand(i))) {
Assert1(OpBB->getParent() == BB->getParent(),
"Referring to a basic block in another function!", &I);
} else if (Argument *OpArg = dyn_cast<Argument>(I.getOperand(i))) {
Assert1(OpArg->getParent() == BB->getParent(),
"Referring to an argument in another function!", &I);
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(I.getOperand(i))) {
Assert1(GV->getParent() == Mod, "Referencing global in another module!",
&I);
} else if (Instruction *Op = dyn_cast<Instruction>(I.getOperand(i))) {
BasicBlock *OpBlock = Op->getParent();
// Check that a definition dominates all of its uses.
if (InvokeInst *II = dyn_cast<InvokeInst>(Op)) {
// Invoke results are only usable in the normal destination, not in the
// exceptional destination.
BasicBlock *NormalDest = II->getNormalDest();
Assert2(NormalDest != II->getUnwindDest(),
"No uses of invoke possible due to dominance structure!",
Op, &I);
// PHI nodes differ from other nodes because they actually "use" the
// value in the predecessor basic blocks they correspond to.
BasicBlock *UseBlock = BB;
if (isa<PHINode>(I))
UseBlock = dyn_cast<BasicBlock>(I.getOperand(i+1));
Assert2(UseBlock, "Invoke operand is PHI node with bad incoming-BB",
Op, &I);
if (isa<PHINode>(I) && UseBlock == OpBlock) {
// Special case of a phi node in the normal destination or the unwind
// destination.
Assert2(BB == NormalDest || !DT->isReachableFromEntry(UseBlock),
"Invoke result not available in the unwind destination!",
Op, &I);
} else {
Assert2(DT->dominates(NormalDest, UseBlock) ||
!DT->isReachableFromEntry(UseBlock),
"Invoke result does not dominate all uses!", Op, &I);
// If the normal successor of an invoke instruction has multiple
// predecessors, then the normal edge from the invoke is critical,
// so the invoke value can only be live if the destination block
// dominates all of it's predecessors (other than the invoke).
if (!NormalDest->getSinglePredecessor() &&
DT->isReachableFromEntry(UseBlock))
// If it is used by something non-phi, then the other case is that
// 'NormalDest' dominates all of its predecessors other than the
// invoke. In this case, the invoke value can still be used.
for (pred_iterator PI = pred_begin(NormalDest),
E = pred_end(NormalDest); PI != E; ++PI)
if (*PI != II->getParent() && !DT->dominates(NormalDest, *PI) &&
DT->isReachableFromEntry(*PI)) {
CheckFailed("Invoke result does not dominate all uses!", Op,&I);
return;
}
}
} else if (isa<PHINode>(I)) {
// PHI nodes are more difficult than other nodes because they actually
// "use" the value in the predecessor basic blocks they correspond to.
BasicBlock *PredBB = dyn_cast<BasicBlock>(I.getOperand(i+1));
Assert2(PredBB && (DT->dominates(OpBlock, PredBB) ||
!DT->isReachableFromEntry(PredBB)),
"Instruction does not dominate all uses!", Op, &I);
} else {
if (OpBlock == BB) {
// If they are in the same basic block, make sure that the definition
// comes before the use.
Assert2(InstsInThisBlock.count(Op) || !DT->isReachableFromEntry(BB),
"Instruction does not dominate all uses!", Op, &I);
}
// Definition must dominate use unless use is unreachable!
Assert2(InstsInThisBlock.count(Op) || DT->dominates(Op, &I) ||
!DT->isReachableFromEntry(BB),
"Instruction does not dominate all uses!", Op, &I);
}
} else if (isa<InlineAsm>(I.getOperand(i))) {
Assert1(i == 0 && (isa<CallInst>(I) || isa<InvokeInst>(I)),
"Cannot take the address of an inline asm!", &I);
}
}
InstsInThisBlock.insert(&I);
VerifyType(I.getType());
}
/// VerifyType - Verify that a type is well formed.
///
void Verifier::VerifyType(const Type *Ty) {
if (!Types.insert(Ty)) return;
Assert1(&Mod->getContext() == &Ty->getContext(),
"Type context does not match Module context!", Ty);
switch (Ty->getTypeID()) {
case Type::FunctionTyID: {
const FunctionType *FTy = cast<FunctionType>(Ty);
const Type *RetTy = FTy->getReturnType();
Assert2(FunctionType::isValidReturnType(RetTy),
"Function type with invalid return type", RetTy, FTy);
VerifyType(RetTy);
for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) {
const Type *ElTy = FTy->getParamType(i);
Assert2(FunctionType::isValidArgumentType(ElTy),
"Function type with invalid parameter type", ElTy, FTy);
VerifyType(ElTy);
}
} break;
case Type::StructTyID: {
const StructType *STy = cast<StructType>(Ty);
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
const Type *ElTy = STy->getElementType(i);
Assert2(StructType::isValidElementType(ElTy),
"Structure type with invalid element type", ElTy, STy);
VerifyType(ElTy);
}
} break;
case Type::ArrayTyID: {
const ArrayType *ATy = cast<ArrayType>(Ty);
Assert1(ArrayType::isValidElementType(ATy->getElementType()),
"Array type with invalid element type", ATy);
VerifyType(ATy->getElementType());
} break;
case Type::PointerTyID: {
const PointerType *PTy = cast<PointerType>(Ty);
Assert1(PointerType::isValidElementType(PTy->getElementType()),
"Pointer type with invalid element type", PTy);
VerifyType(PTy->getElementType());
} break;
case Type::VectorTyID: {
const VectorType *VTy = cast<VectorType>(Ty);
Assert1(VectorType::isValidElementType(VTy->getElementType()),
"Vector type with invalid element type", VTy);
VerifyType(VTy->getElementType());
} break;
default:
break;
}
}
/// VerifyFunctionLocalMetadata - Verify that the specified MDNode is local to
/// specified Function.
void Verifier::VerifyFunctionLocalMetadata(MDNode *N, Function *F,
SmallPtrSet<MDNode *, 32> &Visited) {
assert(N->isFunctionLocal() && "Should only be called on function-local MD");
// Only visit each node once.
if (!Visited.insert(N))
return;
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
Value *V = N->getOperand(i);
if (!V) continue;
Function *ActualF = 0;
if (Instruction *I = dyn_cast<Instruction>(V))
ActualF = I->getParent()->getParent();
else if (BasicBlock *BB = dyn_cast<BasicBlock>(V))
ActualF = BB->getParent();
else if (Argument *A = dyn_cast<Argument>(V))
ActualF = A->getParent();
else if (MDNode *MD = dyn_cast<MDNode>(V))
if (MD->isFunctionLocal())
VerifyFunctionLocalMetadata(MD, F, Visited);
// If this was an instruction, bb, or argument, verify that it is in the
// function that we expect.
Assert1(ActualF == 0 || ActualF == F,
"function-local metadata used in wrong function", N);
}
}
// Flags used by TableGen to mark intrinsic parameters with the
// LLVMExtendedElementVectorType and LLVMTruncatedElementVectorType classes.
static const unsigned ExtendedElementVectorType = 0x40000000;
static const unsigned TruncatedElementVectorType = 0x20000000;
/// visitIntrinsicFunction - Allow intrinsics to be verified in different ways.
///
void Verifier::visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI) {
Function *IF = CI.getCalledFunction();
Assert1(IF->isDeclaration(), "Intrinsic functions should never be defined!",
IF);
#define GET_INTRINSIC_VERIFIER
#include "llvm/Intrinsics.gen"
#undef GET_INTRINSIC_VERIFIER
// If the intrinsic takes MDNode arguments, verify that they are either global
// or are local to *this* function.
for (unsigned i = 1, e = CI.getNumOperands(); i != e; ++i)
if (MDNode *MD = dyn_cast<MDNode>(CI.getOperand(i))) {
if (!MD->isFunctionLocal()) continue;
SmallPtrSet<MDNode *, 32> Visited;
VerifyFunctionLocalMetadata(MD, CI.getParent()->getParent(), Visited);
}
switch (ID) {
default:
break;
case Intrinsic::dbg_declare: { // llvm.dbg.declare
Assert1(CI.getOperand(1) && isa<MDNode>(CI.getOperand(1)),
"invalid llvm.dbg.declare intrinsic call 1", &CI);
MDNode *MD = cast<MDNode>(CI.getOperand(1));
Assert1(MD->getNumOperands() == 1,
"invalid llvm.dbg.declare intrinsic call 2", &CI);
if (MD->getOperand(0))
if (Constant *C = dyn_cast<Constant>(MD->getOperand(0)))
Assert1(C && !isa<ConstantPointerNull>(C),
"invalid llvm.dbg.declare intrinsic call 3", &CI);
} break;
case Intrinsic::memcpy:
case Intrinsic::memmove:
case Intrinsic::memset:
Assert1(isa<ConstantInt>(CI.getOperand(4)),
"alignment argument of memory intrinsics must be a constant int",
&CI);
break;
case Intrinsic::gcroot:
case Intrinsic::gcwrite:
case Intrinsic::gcread:
if (ID == Intrinsic::gcroot) {
AllocaInst *AI =
dyn_cast<AllocaInst>(CI.getOperand(1)->stripPointerCasts());
Assert1(AI && isa<PointerType>(AI->getType()->getElementType()),
"llvm.gcroot parameter #1 must be a pointer alloca.", &CI);
Assert1(isa<Constant>(CI.getOperand(2)),
"llvm.gcroot parameter #2 must be a constant.", &CI);
}
Assert1(CI.getParent()->getParent()->hasGC(),
"Enclosing function does not use GC.", &CI);
break;
case Intrinsic::init_trampoline:
Assert1(isa<Function>(CI.getOperand(2)->stripPointerCasts()),
"llvm.init_trampoline parameter #2 must resolve to a function.",
&CI);
break;
case Intrinsic::prefetch:
Assert1(isa<ConstantInt>(CI.getOperand(2)) &&
isa<ConstantInt>(CI.getOperand(3)) &&
cast<ConstantInt>(CI.getOperand(2))->getZExtValue() < 2 &&
cast<ConstantInt>(CI.getOperand(3))->getZExtValue() < 4,
"invalid arguments to llvm.prefetch",
&CI);
break;
case Intrinsic::stackprotector:
Assert1(isa<AllocaInst>(CI.getOperand(2)->stripPointerCasts()),
"llvm.stackprotector parameter #2 must resolve to an alloca.",
&CI);
break;
case Intrinsic::lifetime_start:
case Intrinsic::lifetime_end:
case Intrinsic::invariant_start:
Assert1(isa<ConstantInt>(CI.getOperand(1)),
"size argument of memory use markers must be a constant integer",
&CI);
break;
case Intrinsic::invariant_end:
Assert1(isa<ConstantInt>(CI.getOperand(2)),
"llvm.invariant.end parameter #2 must be a constant integer", &CI);
break;
}
}
/// Produce a string to identify an intrinsic parameter or return value.
/// The ArgNo value numbers the return values from 0 to NumRets-1 and the
/// parameters beginning with NumRets.
///
static std::string IntrinsicParam(unsigned ArgNo, unsigned NumRets) {
if (ArgNo < NumRets) {
if (NumRets == 1)
return "Intrinsic result type";
else
return "Intrinsic result type #" + utostr(ArgNo);
} else
return "Intrinsic parameter #" + utostr(ArgNo - NumRets);
}
bool Verifier::PerformTypeCheck(Intrinsic::ID ID, Function *F, const Type *Ty,
int VT, unsigned ArgNo, std::string &Suffix) {
const FunctionType *FTy = F->getFunctionType();
unsigned NumElts = 0;
const Type *EltTy = Ty;
const VectorType *VTy = dyn_cast<VectorType>(Ty);
if (VTy) {
EltTy = VTy->getElementType();
NumElts = VTy->getNumElements();
}
const Type *RetTy = FTy->getReturnType();
const StructType *ST = dyn_cast<StructType>(RetTy);
unsigned NumRets = 1;
if (ST)
NumRets = ST->getNumElements();
if (VT < 0) {
int Match = ~VT;
// Check flags that indicate a type that is an integral vector type with
// elements that are larger or smaller than the elements of the matched
// type.
if ((Match & (ExtendedElementVectorType |
TruncatedElementVectorType)) != 0) {
const IntegerType *IEltTy = dyn_cast<IntegerType>(EltTy);
if (!VTy || !IEltTy) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " is not "
"an integral vector type.", F);
return false;
}
// Adjust the current Ty (in the opposite direction) rather than
// the type being matched against.
if ((Match & ExtendedElementVectorType) != 0) {
if ((IEltTy->getBitWidth() & 1) != 0) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " vector "
"element bit-width is odd.", F);
return false;
}
Ty = VectorType::getTruncatedElementVectorType(VTy);
} else
Ty = VectorType::getExtendedElementVectorType(VTy);
Match &= ~(ExtendedElementVectorType | TruncatedElementVectorType);
}
if (Match <= static_cast<int>(NumRets - 1)) {
if (ST)
RetTy = ST->getElementType(Match);
if (Ty != RetTy) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " does not "
"match return type.", F);
return false;
}
} else {
if (Ty != FTy->getParamType(Match - NumRets)) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " does not "
"match parameter %" + utostr(Match - NumRets) + ".", F);
return false;
}
}
} else if (VT == MVT::iAny) {
if (!EltTy->isInteger()) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " is not "
"an integer type.", F);
return false;
}
unsigned GotBits = cast<IntegerType>(EltTy)->getBitWidth();
Suffix += ".";
if (EltTy != Ty)
Suffix += "v" + utostr(NumElts);
Suffix += "i" + utostr(GotBits);
// Check some constraints on various intrinsics.
switch (ID) {
default: break; // Not everything needs to be checked.
case Intrinsic::bswap:
if (GotBits < 16 || GotBits % 16 != 0) {
CheckFailed("Intrinsic requires even byte width argument", F);
return false;
}
break;
}
} else if (VT == MVT::fAny) {
if (!EltTy->isFloatingPoint()) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " is not "
"a floating-point type.", F);
return false;
}
Suffix += ".";
if (EltTy != Ty)
Suffix += "v" + utostr(NumElts);
Suffix += EVT::getEVT(EltTy).getEVTString();
} else if (VT == MVT::vAny) {
if (!VTy) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " is not a vector type.", F);
return false;
}
Suffix += ".v" + utostr(NumElts) + EVT::getEVT(EltTy).getEVTString();
} else if (VT == MVT::iPTR) {
if (!isa<PointerType>(Ty)) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " is not a "
"pointer and a pointer is required.", F);
return false;
}
} else if (VT == MVT::iPTRAny) {
// Outside of TableGen, we don't distinguish iPTRAny (to any address space)
// and iPTR. In the verifier, we can not distinguish which case we have so
// allow either case to be legal.
if (const PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
Suffix += ".p" + utostr(PTyp->getAddressSpace()) +
EVT::getEVT(PTyp->getElementType()).getEVTString();
} else {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " is not a "
"pointer and a pointer is required.", F);
return false;
}
} else if (EVT((MVT::SimpleValueType)VT).isVector()) {
EVT VVT = EVT((MVT::SimpleValueType)VT);
// If this is a vector argument, verify the number and type of elements.
if (VVT.getVectorElementType() != EVT::getEVT(EltTy)) {
CheckFailed("Intrinsic prototype has incorrect vector element type!", F);
return false;
}
if (VVT.getVectorNumElements() != NumElts) {
CheckFailed("Intrinsic prototype has incorrect number of "
"vector elements!", F);
return false;
}
} else if (EVT((MVT::SimpleValueType)VT).getTypeForEVT(Ty->getContext()) !=
EltTy) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " is wrong!", F);
return false;
} else if (EltTy != Ty) {
CheckFailed(IntrinsicParam(ArgNo, NumRets) + " is a vector "
"and a scalar is required.", F);
return false;
}
return true;
}
/// VerifyIntrinsicPrototype - TableGen emits calls to this function into
/// Intrinsics.gen. This implements a little state machine that verifies the
/// prototype of intrinsics.
void Verifier::VerifyIntrinsicPrototype(Intrinsic::ID ID, Function *F,
unsigned RetNum,
unsigned ParamNum, ...) {
va_list VA;
va_start(VA, ParamNum);
const FunctionType *FTy = F->getFunctionType();
// For overloaded intrinsics, the Suffix of the function name must match the
// types of the arguments. This variable keeps track of the expected
// suffix, to be checked at the end.
std::string Suffix;
if (FTy->getNumParams() + FTy->isVarArg() != ParamNum) {
CheckFailed("Intrinsic prototype has incorrect number of arguments!", F);
return;
}
const Type *Ty = FTy->getReturnType();
const StructType *ST = dyn_cast<StructType>(Ty);
// Verify the return types.
if (ST && ST->getNumElements() != RetNum) {
CheckFailed("Intrinsic prototype has incorrect number of return types!", F);
return;
}
for (unsigned ArgNo = 0; ArgNo < RetNum; ++ArgNo) {
int VT = va_arg(VA, int); // An MVT::SimpleValueType when non-negative.
if (ST) Ty = ST->getElementType(ArgNo);
if (!PerformTypeCheck(ID, F, Ty, VT, ArgNo, Suffix))
break;
}
// Verify the parameter types.
for (unsigned ArgNo = 0; ArgNo < ParamNum; ++ArgNo) {
int VT = va_arg(VA, int); // An MVT::SimpleValueType when non-negative.
if (VT == MVT::isVoid && ArgNo > 0) {
if (!FTy->isVarArg())
CheckFailed("Intrinsic prototype has no '...'!", F);
break;
}
if (!PerformTypeCheck(ID, F, FTy->getParamType(ArgNo), VT, ArgNo + RetNum,
Suffix))
break;
}
va_end(VA);
// For intrinsics without pointer arguments, if we computed a Suffix then the
// intrinsic is overloaded and we need to make sure that the name of the
// function is correct. We add the suffix to the name of the intrinsic and
// compare against the given function name. If they are not the same, the
// function name is invalid. This ensures that overloading of intrinsics
// uses a sane and consistent naming convention. Note that intrinsics with
// pointer argument may or may not be overloaded so we will check assuming it
// has a suffix and not.
if (!Suffix.empty()) {
std::string Name(Intrinsic::getName(ID));
if (Name + Suffix != F->getName()) {
CheckFailed("Overloaded intrinsic has incorrect suffix: '" +
F->getName().substr(Name.length()) + "'. It should be '" +
Suffix + "'", F);
}
}
// Check parameter attributes.
Assert1(F->getAttributes() == Intrinsic::getAttributes(ID),
"Intrinsic has wrong parameter attributes!", F);
}
//===----------------------------------------------------------------------===//
// Implement the public interfaces to this file...
//===----------------------------------------------------------------------===//
FunctionPass *llvm::createVerifierPass(VerifierFailureAction action) {
return new Verifier(action);
}
// verifyFunction - Create
bool llvm::verifyFunction(const Function &f, VerifierFailureAction action) {
Function &F = const_cast<Function&>(f);
assert(!F.isDeclaration() && "Cannot verify external functions");
FunctionPassManager FPM(F.getParent());
Verifier *V = new Verifier(action);
FPM.add(V);
FPM.run(F);
return V->Broken;
}
/// verifyModule - Check a module for errors, printing messages on stderr.
/// Return true if the module is corrupt.
///
bool llvm::verifyModule(const Module &M, VerifierFailureAction action,
std::string *ErrorInfo) {
PassManager PM;
Verifier *V = new Verifier(action);
PM.add(V);
PM.run(const_cast<Module&>(M));
if (ErrorInfo && V->Broken)
*ErrorInfo = V->MessagesStr.str();
return V->Broken;
}
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