// 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.
+// 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 the same type
+// * 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
+// * 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
+// * 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)
+// * 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 int %0, %0 ; <int>:0' is bad
// * PHI nodes must have an entry for each predecessor, with no extras.
// * 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
+// * 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
#include "llvm/Analysis/Dominators.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/InstVisitor.h"
-#include "Support/STLExtras.h"
+#include "llvm/ADT/STLExtras.h"
#include <algorithm>
+#include <iostream>
#include <sstream>
using namespace llvm;
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.
+ // 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
+ /// 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.
+ std::set<Instruction*> InstsInThisBlock;
+
Verifier()
- : Broken(false), RealPass(true), action(AbortProcessAction),
- DS(0), msgs( std::ios_base::app | std::ios_base::out ) {}
+ : Broken(false), RealPass(true), action(AbortProcessAction),
+ DS(0), msgs( std::ios::app | std::ios::out ) {}
Verifier( VerifierFailureAction ctn )
- : Broken(false), RealPass(true), action(ctn), DS(0),
- msgs( std::ios_base::app | std::ios_base::out ) {}
+ : Broken(false), RealPass(true), action(ctn), DS(0),
+ msgs( std::ios::app | std::ios::out ) {}
Verifier(bool AB )
- : Broken(false), RealPass(true),
+ : Broken(false), RealPass(true),
action( AB ? AbortProcessAction : PrintMessageAction), DS(0),
- msgs( std::ios_base::app | std::ios_base::out ) {}
+ msgs( std::ios::app | std::ios::out ) {}
Verifier(DominatorSet &ds)
: Broken(false), RealPass(false), action(PrintMessageAction),
- DS(&ds), msgs( std::ios_base::app | std::ios_base::out ) {}
+ DS(&ds), msgs( std::ios::app | std::ios::out ) {}
bool doInitialization(Module &M) {
// Get dominator information if we are being run by PassManager
if (RealPass) DS = &getAnalysis<DominatorSet>();
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
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)
+ 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);
+ // Check to make sure function prototypes are okay.
+ if (I->isExternal()) visitFunction(*I);
+ }
+
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
+ visitGlobalVariable(*I);
// If the module is broken, abort at this time.
abortIfBroken();
// Verification methods...
void verifySymbolTable(SymbolTable &ST);
void visitGlobalValue(GlobalValue &GV);
+ void visitGlobalVariable(GlobalVariable &GV);
void visitFunction(Function &F);
void visitBasicBlock(BasicBlock &BB);
void visitPHINode(PHINode &PN);
if (!V) return;
if (isa<Instruction>(V)) {
msgs << *V;
- } else if (const Type *Ty = dyn_cast<Type>(V)) {
- WriteTypeSymbolic(msgs, Ty, Mod);
} 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
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);
+ Broken = true;
+ }
};
RegisterOpt<Verifier> X("verify", "Module Verifier");
}
}
+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);
+
+ visitGlobalValue(GV);
+}
+
+
// verifySymbolTable - Verify that a function or module symbol table is ok
//
void Verifier::verifySymbolTable(SymbolTable &ST) {
- // Loop over all of the types in the symbol table...
- for (SymbolTable::iterator TI = ST.begin(), TE = ST.end(); TI != TE; ++TI)
- for (SymbolTable::type_iterator I = TI->second.begin(),
- E = TI->second.end(); I != E; ++I) {
- Value *V = I->second;
+ // 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);
+ "Values with void type are not allowed to have names!", V);
}
}
-
// visitFunction - Verify that a function is ok.
//
void Verifier::visitFunction(Function &F) {
// 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)
+ 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));
+ // Make sure no aggregates are passed by value.
+ Assert1(I->getType()->isFirstClassType(),
+ "Functions cannot take aggregates as arguments by value!", I);
+ }
if (!F.isExternal()) {
verifySymbolTable(F.getSymbolTable());
// 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())) {
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) {
+ 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,
}
}
}
-
- // Ensure that basic blocks have terminators!
- Assert1(BB.getTerminator(), "Basic Block does not have terminator!", &BB);
}
void Verifier::visitTerminatorInst(TerminatorInst &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);
+ Assert2(F->getReturnType() == Type::VoidTy,
+ "Found return instr that returns void in Function of non-void "
+ "return type!", &RI, F->getReturnType());
else
Assert2(F->getReturnType() == RI.getOperand(0)->getType(),
"Function return type does not match operand "
"Select values must have identical types!", &SI);
Assert1(SI.getTrueValue()->getType() == SI.getType(),
"Select values must have same type as select instruction!", &SI);
+ visitInstruction(SI);
}
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);
+ Assert1(B.getType()->isInteger() || B.getType()->isFloatingPoint() ||
+ isa<PackedType>(B.getType()),
+ "Arithmetic operators must have integer, fp, or packed type!", &B);
}
visitInstruction(B);
for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
// Check to make sure that the "address of" an intrinsic function is never
// taken.
+ Assert1(I.getOperand(i) != 0, "Instruction has null operand!", &I);
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 (OpBlock == BB) {
// If they are in the same basic block, make sure that the definition
// comes before the use.
- Assert2(DS->dominates(Op, &I),
+ Assert2(InstsInThisBlock.count(Op) ||
+ !DS->dominates(&BB->getParent()->getEntryBlock(), BB),
"Instruction does not dominate all uses!", Op, &I);
}
}
}
}
+ InstsInThisBlock.insert(&I);
}
/// visitIntrinsicFunction - Allow intrinsics to be verified in different ways.
"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,
+ Assert1(isa<PointerType>(FT->getParamType(1)),
"Second argument not a pointer!", IF);
NumArgs = 2;
break;
NumArgs = 1;
break;
- case Intrinsic:: readio: {
- const Type * ParamType = FT->getParamType(0);
- const Type * ReturnType = FT->getReturnType();
+ 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(isa<PointerType>(ParamType),
- "First argument not a pointer!", IF);
- Assert1(((cast<PointerType>(ParamType)->getElementType()) == ReturnType),
+ 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::isunordered:
+ Assert1(FT->getNumParams() == 2,
+ "Illegal # arguments for intrinsic function!", IF);
+ Assert1(FT->getReturnType() == Type::BoolTy,
+ "Return type is not bool!", IF);
+ Assert1(FT->getParamType(0) == FT->getParamType(1),
+ "Arguments must be of the same type!", IF);
+ Assert1(FT->getParamType(0)->isFloatingPoint(),
+ "Argument is not a floating point type!", IF);
+ NumArgs = 2;
+ 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)),
+ "Second argument to llvm.gcroot must be a constant!", &CI);
+ NumArgs = 2;
+ break;
+ case Intrinsic::gcread: NumArgs = 2; break;
+ case Intrinsic::gcwrite: NumArgs = 3; 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::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::prefetch: NumArgs = 3; break;
+
case Intrinsic::not_intrinsic:
assert(0 && "Invalid intrinsic!"); NumArgs = 0; break;
}
PM.run((Module&)M);
return V->Broken;
}
+
+// vim: sw=2
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