//===-- Verifier.cpp - Implement the Module Verifier -------------*- C++ -*-==//
+//
+// The LLVM Compiler Infrastructure
//
-// This file defines the method verifier interface, that can be used for some
+// This file was developed by the LLVM research group and 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.
//
-// . There are no duplicated names in a symbol table... ie there !exist a val
-// with the same name as something in the symbol table, but with a different
-// address as what is in the symbol table...
-// . Both of a binary operator's parameters are the same type
-// . Verify that arithmetic and other things are only performed on first class
-// types. No adding structures or arrays.
+// * Both of a binary operator's parameters are 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
+// * 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!]
-// . Right now 'add bool 0, 0' is valid. This isn't particularly good.
-// . Only phi nodes can be self referential: 'add int 0, 0 ; <int>:0' is bad
-// . PHI nodes must have an entry for each predecessor, with no extras.
-// . All other things that are tested by asserts spread about the code...
-// . All basic blocks should only end with terminator insts, not contain them
-// . All methods must have >= 1 basic block
-// . Verify that none of the Value getType()'s are null.
-// . Method's cannot take a void typed parameter
-// . Verify that a method's argument list agrees with it's declared type.
-// . Verify that arrays and structures have fixed elements: No unsized arrays.
+// * Only phi nodes can be self referential: 'add int %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
+// . Function's 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/Method.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/Constants.h"
+#include "llvm/Pass.h"
#include "llvm/Module.h"
-#include "llvm/BasicBlock.h"
-#include "llvm/Type.h"
+#include "llvm/ModuleProvider.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Instructions.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/PassManager.h"
+#include "llvm/SymbolTable.h"
+#include "llvm/Analysis/Dominators.h"
+#include "llvm/Support/CFG.h"
+#include "llvm/Support/InstVisitor.h"
+#include "Support/STLExtras.h"
+#include <algorithm>
+#include <sstream>
+using namespace llvm;
+
+namespace { // Anonymous namespace for class
+
+ struct Verifier : public FunctionPass, InstVisitor<Verifier> {
+ 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
+ DominatorSet *DS; // Dominator set, caution can be null!
+ std::stringstream msgs; // A stringstream to collect messages
+
+ Verifier()
+ : Broken(false), RealPass(true), action(AbortProcessAction),
+ DS(0), msgs( std::ios_base::app | std::ios_base::out ) {}
+ Verifier( VerifierFailureAction ctn )
+ : Broken(false), RealPass(true), action(ctn), DS(0),
+ msgs( std::ios_base::app | std::ios_base::out ) {}
+ Verifier(bool AB )
+ : Broken(false), RealPass(true),
+ action( AB ? AbortProcessAction : PrintMessageAction), DS(0),
+ msgs( std::ios_base::app | std::ios_base::out ) {}
+ Verifier(DominatorSet &ds)
+ : Broken(false), RealPass(false), action(PrintMessageAction),
+ DS(&ds), msgs( std::ios_base::app | std::ios_base::out ) {}
+
+
+ bool doInitialization(Module &M) {
+ Mod = &M;
+ verifySymbolTable(M.getSymbolTable());
+
+ // 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)
+ abortIfBroken();
+ return false;
+ }
+
+ bool runOnFunction(Function &F) {
+ // Get dominator information if we are being run by PassManager
+ if (RealPass) DS = &getAnalysis<DominatorSet>();
+ visit(F);
+
+ // 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)
+ 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);
+
+ for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
+ visitGlobalValue(*I);
+
+ // If the module is broken, abort at this time.
+ abortIfBroken();
+ return false;
+ }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ if (RealPass)
+ AU.addRequired<DominatorSet>();
+ }
+
+ /// abortIfBroken - If the module is broken and we are supposed to abort on
+ /// this condition, do so.
+ ///
+ void abortIfBroken() {
+ if (Broken)
+ {
+ msgs << "Broken module found, ";
+ switch (action)
+ {
+ case AbortProcessAction:
+ msgs << "compilation aborted!\n";
+ std::cerr << msgs.str();
+ abort();
+ case ThrowExceptionAction:
+ msgs << "verification terminated.\n";
+ throw msgs.str();
+ case PrintMessageAction:
+ msgs << "verification continues.\n";
+ std::cerr << msgs.str();
+ break;
+ case ReturnStatusAction:
+ break;
+ }
+ }
+ }
+
+
+ // Verification methods...
+ void verifySymbolTable(SymbolTable &ST);
+ void visitGlobalValue(GlobalValue &GV);
+ void visitFunction(Function &F);
+ void visitBasicBlock(BasicBlock &BB);
+ void visitPHINode(PHINode &PN);
+ void visitBinaryOperator(BinaryOperator &B);
+ void visitShiftInst(ShiftInst &SI);
+ void visitVANextInst(VANextInst &VAN) { visitInstruction(VAN); }
+ void visitVAArgInst(VAArgInst &VAA) { visitInstruction(VAA); }
+ void visitCallInst(CallInst &CI);
+ 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 WriteValue(const Value *V) {
+ if (!V) return;
+ if (isa<Instruction>(V)) {
+ msgs << *V;
+ } else {
+ WriteAsOperand (msgs, V, true, true, Mod);
+ msgs << "\n";
+ }
+ }
+
+ void WriteType(const Type* T ) {
+ if ( !T ) return;
+ WriteTypeSymbolic(msgs, 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 std::string &Message,
+ const Value *V1 = 0, const Value *V2 = 0,
+ const Value *V3 = 0, const Value *V4 = 0) {
+ msgs << Message << "\n";
+ WriteValue(V1);
+ WriteValue(V2);
+ WriteValue(V3);
+ WriteValue(V4);
+ Broken = true;
+ }
+
+ void CheckFailed( const std::string& Message, const Value* V1,
+ const Type* T2, const Value* V3 = 0 ) {
+ msgs << Message << "\n";
+ WriteValue(V1);
+ WriteType(T2);
+ WriteValue(V3);
+ }
+ };
+
+ RegisterOpt<Verifier> X("verify", "Module Verifier");
+} // End anonymous namespace
+
+
+// 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)
-// Error - Define a macro to do the common task of pushing a message onto the
-// end of the error list and setting Bad to true.
+
+void Verifier::visitGlobalValue(GlobalValue &GV) {
+ Assert1(!GV.isExternal() || GV.hasExternalLinkage(),
+ "Global is external, but doesn't have external linkage!", &GV);
+ Assert1(!GV.hasAppendingLinkage() || isa<GlobalVariable>(GV),
+ "Only global variables can have appending linkage!", &GV);
+
+ if (GV.hasAppendingLinkage()) {
+ GlobalVariable &GVar = cast<GlobalVariable>(GV);
+ Assert1(isa<ArrayType>(GVar.getType()->getElementType()),
+ "Only global arrays can have appending linkage!", &GV);
+ }
+}
+
+// verifySymbolTable - Verify that a function or module symbol table is ok
//
-#define Error(msg) do { ErrorMsgs.push_back(msg); Bad = true; } while (0)
+void Verifier::verifySymbolTable(SymbolTable &ST) {
-#define t(x) (1 << (unsigned)Type::x)
+ // Loop over all of the values in all type planes in the symbol table.
+ for (SymbolTable::plane_const_iterator PI = ST.plane_begin(),
+ PE = ST.plane_end(); PI != PE; ++PI)
+ for (SymbolTable::value_const_iterator VI = PI->second.begin(),
+ VE = PI->second.end(); VI != VE; ++VI) {
+ Value *V = VI->second;
+ // Check that there are no void typed values in the symbol table. Values
+ // with a void type cannot be put into symbol tables because they cannot
+ // have names!
+ Assert1(V->getType() != Type::VoidTy,
+ "Values with void type are not allowed to have names!", V);
+ }
+}
-#define SignedIntegralTypes (t(SByteTyID) | t(ShortTyID) | \
- t(IntTyID) | t(LongTyID))
-static long UnsignedIntegralTypes = t(UByteTyID) | t(UShortTyID) |
- t(UIntTyID) | t(ULongTyID);
-static const long FloatingPointTypes = t(FloatTyID) | t(DoubleTyID);
+// visitFunction - Verify that a function is ok.
+//
+void Verifier::visitFunction(Function &F) {
+ // Check function arguments...
+ const FunctionType *FT = F.getFunctionType();
+ unsigned NumArgs = F.getArgumentList().size();
-static const long IntegralTypes = SignedIntegralTypes | UnsignedIntegralTypes;
+ Assert2(FT->getNumParams() == NumArgs,
+ "# formal arguments must match # of arguments for function type!",
+ &F, FT);
+ Assert1(F.getReturnType()->isFirstClassType() ||
+ F.getReturnType() == Type::VoidTy,
+ "Functions cannot return aggregate values!", &F);
-#if 0
-static long ValidTypes[Type::FirstDerivedTyID] = {
- [(unsigned)Instruction::UnaryOps::Not] t(BoolTyID),
- //[Instruction::UnaryOps::Add] = IntegralTypes,
- // [Instruction::Sub] = IntegralTypes,
-};
-#endif
+ // Check that the argument values match the function type for this function...
+ unsigned i = 0;
+ for (Function::aiterator I = F.abegin(), E = F.aend(); I != E; ++I, ++i)
+ Assert2(I->getType() == FT->getParamType(i),
+ "Argument value does not match function argument type!",
+ I, FT->getParamType(i));
-#undef t
+ if (!F.isExternal()) {
+ verifySymbolTable(F.getSymbolTable());
-static bool verify(const BasicBlock *BB, vector<string> &ErrorMsgs) {
- bool Bad = false;
- if (BB->getTerminator() == 0) Error("Basic Block does not have terminator!");
+ // Check the entry node
+ BasicBlock *Entry = &F.getEntryBlock();
+ Assert1(pred_begin(Entry) == pred_end(Entry),
+ "Entry block to function must not have predecessors!", Entry);
+ }
+}
-
- return Bad;
+
+// verifyBasicBlock - Verify that a basic block is well formed...
+//
+void Verifier::visitBasicBlock(BasicBlock &BB) {
+ // Check constraints that this basic block imposes on all of the PHI nodes in
+ // it.
+ if (isa<PHINode>(BB.front())) {
+ std::vector<BasicBlock*> Preds(pred_begin(&BB), pred_end(&BB));
+ std::sort(Preds.begin(), Preds.end());
+
+ for (BasicBlock::iterator I = BB.begin();
+ PHINode *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...
+ std::vector<std::pair<BasicBlock*, Value*> > Values;
+ 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]);
+ }
+ }
+ }
+
+ // Ensure that basic blocks have terminators!
+ Assert1(BB.getTerminator(), "Basic Block does not have terminator!", &BB);
+}
+
+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();
+ if (RI.getNumOperands() == 0)
+ Assert1(F->getReturnType() == Type::VoidTy,
+ "Function returns no value, but ret instruction found that does!",
+ &RI);
+ else
+ Assert2(F->getReturnType() == RI.getOperand(0)->getType(),
+ "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();
+ 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);
+
+ visitTerminatorInst(SI);
}
+void Verifier::visitSelectInst(SelectInst &SI) {
+ Assert1(SI.getCondition()->getType() == Type::BoolTy,
+ "Select condition type must be bool!", &SI);
+ Assert1(SI.getTrueValue()->getType() == SI.getFalseValue()->getType(),
+ "Select values must have identical types!", &SI);
+ Assert1(SI.getTrueValue()->getType() == SI.getType(),
+ "Select values must have same type as select instruction!", &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);
+}
+
+/// 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.getParent()->front() == &PN || isa<PHINode>(PN.getPrev()),
+ "PHI nodes not grouped at top of basic block!",
+ &PN, PN.getParent());
+
+ // Check that all of the operands of the PHI node have the same type as the
+ // result.
+ 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);
-bool verify(const Method *M, vector<string> &ErrorMsgs) {
- bool Bad = false;
+ // All other PHI node constraints are checked in the visitBasicBlock method.
+
+ visitInstruction(PN);
+}
+
+void Verifier::visitCallInst(CallInst &CI) {
+ Assert1(isa<PointerType>(CI.getOperand(0)->getType()),
+ "Called function must be a pointer!", &CI);
+ const PointerType *FPTy = cast<PointerType>(CI.getOperand(0)->getType());
+ Assert1(isa<FunctionType>(FPTy->getElementType()),
+ "Called function is not pointer to function type!", &CI);
+
+ const FunctionType *FTy = cast<FunctionType>(FPTy->getElementType());
+
+ // Verify that the correct number of arguments are being passed
+ if (FTy->isVarArg())
+ Assert1(CI.getNumOperands()-1 >= FTy->getNumParams(),
+ "Called function requires more parameters than were provided!",&CI);
+ else
+ Assert1(CI.getNumOperands()-1 == FTy->getNumParams(),
+ "Incorrect number of arguments passed to called function!", &CI);
+
+ // Verify that all arguments to the call match the function type...
+ for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
+ Assert3(CI.getOperand(i+1)->getType() == FTy->getParamType(i),
+ "Call parameter type does not match function signature!",
+ CI.getOperand(i+1), FTy->getParamType(i), &CI);
+
+ if (Function *F = CI.getCalledFunction())
+ if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
+ visitIntrinsicFunctionCall(ID, CI);
+
+ visitInstruction(CI);
+}
+
+/// 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);
+
+ // Check that logical operators are only used with integral operands.
+ if (B.getOpcode() == Instruction::And || B.getOpcode() == Instruction::Or ||
+ B.getOpcode() == Instruction::Xor) {
+ Assert1(B.getType()->isIntegral(),
+ "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);
+ } else if (isa<SetCondInst>(B)) {
+ // Check that setcc instructions return bool
+ Assert1(B.getType() == Type::BoolTy,
+ "setcc instructions must return boolean values!", &B);
+ } else {
+ // Arithmetic operators only work on integer or fp values
+ Assert1(B.getType() == B.getOperand(0)->getType(),
+ "Arithmetic operators must have same type for operands and result!",
+ &B);
+ Assert1(B.getType()->isInteger() || B.getType()->isFloatingPoint(),
+ "Arithmetic operators must have integer or fp type!", &B);
+ }
- for (Method::const_iterator BBIt = M->begin();
- BBIt != M->end(); ++BBIt)
- Bad |= verify(*BBIt, ErrorMsgs);
+ visitInstruction(B);
+}
+
+void Verifier::visitShiftInst(ShiftInst &SI) {
+ Assert1(SI.getType()->isInteger(),
+ "Shift must return an integer result!", &SI);
+ Assert1(SI.getType() == SI.getOperand(0)->getType(),
+ "Shift return type must be same as first operand!", &SI);
+ Assert1(SI.getOperand(1)->getType() == Type::UByteTy,
+ "Second operand to shift must be ubyte type!", &SI);
+ visitInstruction(SI);
+}
+
+void Verifier::visitGetElementPtrInst(GetElementPtrInst &GEP) {
+ const Type *ElTy =
+ GetElementPtrInst::getIndexedType(GEP.getOperand(0)->getType(),
+ std::vector<Value*>(GEP.idx_begin(), GEP.idx_end()), true);
+ Assert1(ElTy, "Invalid indices for GEP pointer type!", &GEP);
+ Assert2(PointerType::get(ElTy) == GEP.getType(),
+ "GEP is not of right type for indices!", &GEP, ElTy);
+ visitInstruction(GEP);
+}
+
+void Verifier::visitLoadInst(LoadInst &LI) {
+ const Type *ElTy =
+ cast<PointerType>(LI.getOperand(0)->getType())->getElementType();
+ Assert2(ElTy == LI.getType(),
+ "Load result type does not match pointer operand type!", &LI, ElTy);
+ visitInstruction(LI);
+}
+
+void Verifier::visitStoreInst(StoreInst &SI) {
+ const Type *ElTy =
+ cast<PointerType>(SI.getOperand(1)->getType())->getElementType();
+ Assert2(ElTy == SI.getOperand(0)->getType(),
+ "Stored value type does not match pointer operand type!", &SI, ElTy);
+ visitInstruction(SI);
+}
+
+
+/// 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 ||
+ !DS->dominates(&BB->getParent()->getEntryBlock(), BB),
+ "Only PHI nodes may reference their own value!", &I);
+ }
+
+ // Check that void typed values don't have names
+ Assert1(I.getType() != Type::VoidTy || !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() == Type::VoidTy || I.getType()->isFirstClassType(),
+ "Instruction returns a non-scalar type!", &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) {
+ Assert1(isa<Instruction>(*UI), "Use of instruction is not an instruction!",
+ *UI);
+ Instruction *Used = cast<Instruction>(*UI);
+ Assert2(Used->getParent() != 0, "Instruction referencing instruction not"
+ " embeded in a basic block!", &I, Used);
+ }
- return Bad;
+ for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
+ // Check to make sure that the "address of" an intrinsic function is never
+ // taken.
+ if (Function *F = dyn_cast<Function>(I.getOperand(i))) {
+ Assert1(!F->isIntrinsic() || (i == 0 && isa<CallInst>(I)),
+ "Cannot take the address of an intrinsic!", &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 (Instruction *Op = dyn_cast<Instruction>(I.getOperand(i))) {
+ BasicBlock *OpBlock = Op->getParent();
+
+ // Check that a definition dominates all of its uses.
+ if (!isa<PHINode>(I)) {
+ // Invoke results are only usable in the normal destination, not in the
+ // exceptional destination.
+ if (InvokeInst *II = dyn_cast<InvokeInst>(Op))
+ OpBlock = II->getNormalDest();
+ else if (OpBlock == BB) {
+ // If they are in the same basic block, make sure that the definition
+ // comes before the use.
+ Assert2(DS->dominates(Op, &I),
+ "Instruction does not dominate all uses!", Op, &I);
+ }
+
+ // Definition must dominate use unless use is unreachable!
+ Assert2(DS->dominates(OpBlock, BB) ||
+ !DS->dominates(&BB->getParent()->getEntryBlock(), BB),
+ "Instruction does not dominate all uses!", Op, &I);
+ } else {
+ // PHI nodes are more difficult than other nodes because they actually
+ // "use" the value in the predecessor basic blocks they correspond to.
+ BasicBlock *PredBB = cast<BasicBlock>(I.getOperand(i+1));
+ Assert2(DS->dominates(OpBlock, PredBB) ||
+ !DS->dominates(&BB->getParent()->getEntryBlock(), PredBB),
+ "Instruction does not dominate all uses!", Op, &I);
+ }
+ }
+ }
+}
+
+/// visitIntrinsicFunction - Allow intrinsics to be verified in different ways.
+///
+void Verifier::visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI) {
+ Function *IF = CI.getCalledFunction();
+ const FunctionType *FT = IF->getFunctionType();
+ Assert1(IF->isExternal(), "Intrinsic functions should never be defined!", IF);
+ unsigned NumArgs = 0;
+
+ // FIXME: this should check the return type of each intrinsic as well, also
+ // arguments!
+ switch (ID) {
+ case Intrinsic::vastart:
+ Assert1(CI.getParent()->getParent()->getFunctionType()->isVarArg(),
+ "llvm.va_start intrinsic may only occur in function with variable"
+ " args!", &CI);
+ NumArgs = 0;
+ break;
+ case Intrinsic::vaend: NumArgs = 1; break;
+ case Intrinsic::vacopy: NumArgs = 1; break;
+
+ case Intrinsic::returnaddress:
+ case Intrinsic::frameaddress:
+ Assert1(isa<PointerType>(FT->getReturnType()),
+ "llvm.(frame|return)address must return pointers", IF);
+ Assert1(FT->getNumParams() == 1 && isa<ConstantInt>(CI.getOperand(1)),
+ "llvm.(frame|return)address require a single constant integer argument",
+ &CI);
+ NumArgs = 1;
+ break;
+
+ // Verify that read and write port have integral parameters of the correct
+ // signed-ness.
+ case Intrinsic::writeport:
+ Assert1(FT->getNumParams() == 2,
+ "Illegal # arguments for intrinsic function!", IF);
+ Assert1(FT->getParamType(0)->isIntegral(),
+ "First argument not unsigned int!", IF);
+ Assert1(FT->getParamType(1)->isUnsigned(),
+ "First argument not unsigned int!", IF);
+ NumArgs = 2;
+ break;
+
+ case Intrinsic::writeio:
+ Assert1(FT->getNumParams() == 2,
+ "Illegal # arguments for intrinsic function!", IF);
+ Assert1(FT->getParamType(0)->isFirstClassType(),
+ "First argument not a first class type!", IF);
+ Assert1(FT->getParamType(1)->getPrimitiveID() == Type::PointerTyID,
+ "Second argument not a pointer!", IF);
+ NumArgs = 2;
+ break;
+
+ case Intrinsic::readport:
+ Assert1(FT->getNumParams() == 1,
+ "Illegal # arguments for intrinsic function!", IF);
+ Assert1(FT->getReturnType()->isFirstClassType(),
+ "Return type is not a first class type!", IF);
+ Assert1(FT->getParamType(0)->isUnsigned(),
+ "First argument not unsigned int!", IF);
+ NumArgs = 1;
+ break;
+
+ case Intrinsic::readio: {
+ const PointerType *ParamType = dyn_cast<PointerType>(FT->getParamType(0));
+ const Type *ReturnType = FT->getReturnType();
+
+ Assert1(FT->getNumParams() == 1,
+ "Illegal # arguments for intrinsic function!", IF);
+ Assert1(ParamType, "First argument not a pointer!", IF);
+ Assert1(ParamType->getElementType() == ReturnType,
+ "Pointer type doesn't match return type!", IF);
+ NumArgs = 1;
+ break;
+ }
+
+ case Intrinsic::setjmp: NumArgs = 1; break;
+ case Intrinsic::longjmp: NumArgs = 2; break;
+ case Intrinsic::sigsetjmp: NumArgs = 2; break;
+ case Intrinsic::siglongjmp: NumArgs = 2; break;
+
+ case Intrinsic::gcroot:
+ Assert1(FT->getNumParams() == 2,
+ "Illegal # arguments for intrinsic function!", IF);
+ Assert1(isa<Constant>(CI.getOperand(2)) ||
+ isa<GlobalValue>(CI.getOperand(2)),
+ "Second argument to llvm.gcroot must be a constant!", &CI);
+ NumArgs = 2;
+ break;
+ case Intrinsic::gcread: NumArgs = 1; break;
+ case Intrinsic::gcwrite: NumArgs = 2; break;
+
+ case Intrinsic::dbg_stoppoint: NumArgs = 4; break;
+ case Intrinsic::dbg_region_start:NumArgs = 1; break;
+ case Intrinsic::dbg_region_end: NumArgs = 1; break;
+ case Intrinsic::dbg_func_start: NumArgs = 1; break;
+ case Intrinsic::dbg_declare: NumArgs = 1; break;
+
+ case Intrinsic::memcpy: NumArgs = 4; break;
+ case Intrinsic::memmove: NumArgs = 4; break;
+ case Intrinsic::memset: NumArgs = 4; break;
+
+ case Intrinsic::alpha_ctlz: NumArgs = 1; break;
+ case Intrinsic::alpha_cttz: NumArgs = 1; break;
+ case Intrinsic::alpha_ctpop: NumArgs = 1; break;
+ case Intrinsic::alpha_umulh: NumArgs = 2; break;
+ case Intrinsic::alpha_vecop: NumArgs = 4; break;
+ case Intrinsic::alpha_pup: NumArgs = 3; break;
+ case Intrinsic::alpha_bytezap: NumArgs = 2; break;
+ case Intrinsic::alpha_bytemanip: NumArgs = 3; break;
+ case Intrinsic::alpha_dfpbop: NumArgs = 3; break;
+ case Intrinsic::alpha_dfpuop: NumArgs = 2; break;
+ case Intrinsic::alpha_unordered: NumArgs = 2; break;
+ case Intrinsic::alpha_uqtodfp: NumArgs = 2; break;
+ case Intrinsic::alpha_uqtosfp: NumArgs = 2; break;
+ case Intrinsic::alpha_dfptosq: NumArgs = 2; break;
+ case Intrinsic::alpha_sfptosq: NumArgs = 2; break;
+
+ case Intrinsic::not_intrinsic:
+ assert(0 && "Invalid intrinsic!"); NumArgs = 0; break;
+ }
+
+ Assert1(FT->getNumParams() == NumArgs || (FT->getNumParams() < NumArgs &&
+ FT->isVarArg()),
+ "Illegal # arguments for intrinsic function!", IF);
}
-bool verify(const Module *C, vector<string> &ErrorMsgs) {
- bool Bad = false;
- assert(Type::FirstDerivedTyID-1 < sizeof(long)*8 &&
- "Resize ValidTypes table to handle more than 32 primitive types!");
- for (Module::const_iterator MI = C->begin(); MI != C->end(); ++MI)
- Bad |= verify(*MI, ErrorMsgs);
+//===----------------------------------------------------------------------===//
+// 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.isExternal() && "Cannot verify external functions");
- return Bad;
+ FunctionPassManager FPM(new ExistingModuleProvider(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) {
+ PassManager PM;
+ Verifier *V = new Verifier(action);
+ PM.add(V);
+ PM.run((Module&)M);
+ return V->Broken;
+}
+
+// vim: sw=2
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