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212 lines
8.2 KiB
C++
212 lines
8.2 KiB
C++
//===-- Verifier.cpp - Implement the Module Verifier -------------*- C++ -*-==//
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//
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// This file defines the function verifier interface, that can be used for some
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// sanity checking of input to the system.
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//
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// Note that this does not provide full 'java style' security and verifications,
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// instead it just tries to ensure that code is well formed.
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//
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// . There are no duplicated names in a symbol table... ie there !exist a val
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// with the same name as something in the symbol table, but with a different
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// address as what is in the symbol table...
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// . Both of a binary operator's parameters are the same type
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// . Verify that arithmetic and other things are only performed on first class
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// types. No adding structures or arrays.
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// . All of the constants in a switch statement are of the correct type
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// . The code is in valid SSA form
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// . It should be illegal to put a label into any other type (like a structure)
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// or to return one. [except constant arrays!]
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// . Right now 'add bool 0, 0' is valid. This isn't particularly good.
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// * Only phi nodes can be self referential: 'add int %0, %0 ; <int>:0' is bad
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// * PHI nodes must have an entry for each predecessor, with no extras.
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// * All basic blocks should only end with terminator insts, not contain them
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// * The entry node to a function must not have predecessors
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// * All Instructions must be embeded into a basic block
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// . Verify that none of the Value getType()'s are null.
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// . Function's cannot take a void typed parameter
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// . Verify that a function's argument list agrees with it's declared type.
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// . Verify that arrays and structures have fixed elements: No unsized arrays.
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// * It is illegal to specify a name for a void value.
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// * It is illegal to have a internal function that is just a declaration
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// . All other things that are tested by asserts spread about the code...
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Pass.h"
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#include "llvm/Function.h"
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#include "llvm/Module.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/Type.h"
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#include "llvm/iPHINode.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/Support/CFG.h"
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#include "Support/STLExtras.h"
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#include <algorithm>
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#if 0
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#define t(x) (1 << (unsigned)Type::x)
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#define SignedIntegralTypes (t(SByteTyID) | t(ShortTyID) | \
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t(IntTyID) | t(LongTyID))
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static long UnsignedIntegralTypes = t(UByteTyID) | t(UShortTyID) |
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t(UIntTyID) | t(ULongTyID);
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static const long FloatingPointTypes = t(FloatTyID) | t(DoubleTyID);
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static const long IntegralTypes = SignedIntegralTypes | UnsignedIntegralTypes;
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static long ValidTypes[Type::FirstDerivedTyID] = {
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[(unsigned)Instruction::UnaryOps::Not] t(BoolTyID),
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//[Instruction::UnaryOps::Add] = IntegralTypes,
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// [Instruction::Sub] = IntegralTypes,
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};
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#undef t
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#endif
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// CheckFailed - A check failed, so print out the condition and the message that
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// failed. This provides a nice place to put a breakpoint if you want to see
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// why something is not correct.
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//
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static inline void CheckFailed(const char *Cond, const std::string &Message,
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const Value *V1 = 0, const Value *V2 = 0) {
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std::cerr << Message << "\n";
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if (V1) { V1->dump(); std::cerr << "\n"; }
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if (V2) { V2->dump(); std::cerr << "\n"; }
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}
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// Assert - We know that cond should be true, if not print an error message.
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#define Assert(C, M) \
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do { if (!(C)) { CheckFailed(#C, M); Broken = true; } } while (0)
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#define Assert1(C, M, V1) \
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do { if (!(C)) { CheckFailed(#C, M, V1); Broken = true; } } while (0)
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#define Assert2(C, M, V1, V2) \
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do { if (!(C)) { CheckFailed(#C, M, V1, V2); Broken = true; } } while (0)
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// verifyInstruction - Verify that a non-terminator instruction is well formed.
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//
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static bool verifyInstruction(const Instruction *I) {
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bool Broken = false;
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assert(I->getParent() && "Instruction not embedded in basic block!");
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Assert1(!isa<TerminatorInst>(I),
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"Terminator instruction found embedded in basic block!\n", I);
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// Check that all uses of the instruction, if they are instructions
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// themselves, actually have parent basic blocks.
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//
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for (User::use_const_iterator UI = I->use_begin(), UE = I->use_end();
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UI != UE; ++UI) {
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if (Instruction *Used = dyn_cast<Instruction>(*UI))
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Assert2(Used->getParent() != 0, "Instruction referencing instruction not"
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" embeded in a basic block!", I, Used);
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}
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// Check that PHI nodes look ok
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if (const PHINode *PN = dyn_cast<PHINode>(I)) {
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std::vector<const BasicBlock*> Preds(pred_begin(I->getParent()),
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pred_end(I->getParent()));
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// Loop over all of the incoming values, make sure that there are
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// predecessors for each one...
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//
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for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
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const BasicBlock *BB = PN->getIncomingBlock(i);
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std::vector<const BasicBlock*>::iterator PI =
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find(Preds.begin(), Preds.end(), BB);
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Assert2(PI != Preds.end(), "PHI node has entry for basic block that"
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" is not a predecessor!", PN, BB);
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if (PI != Preds.end()) Preds.erase(PI);
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}
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// There should be no entries left in the predecessor list...
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for (std::vector<const BasicBlock*>::iterator I = Preds.begin(),
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E = Preds.end(); I != E; ++I)
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Assert2(0, "PHI node does not have entry for a predecessor basic block!",
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PN, *I);
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} else {
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// Check that non-phi nodes are not self referential...
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for (Value::use_const_iterator UI = I->use_begin(), UE = I->use_end();
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UI != UE; ++UI)
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Assert1(*UI != (const User*)I,
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"Only PHI nodes may reference their own value!", I);
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}
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return Broken;
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}
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// verifyBasicBlock - Verify that a basic block is well formed...
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//
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static bool verifyBasicBlock(const BasicBlock *BB) {
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bool Broken = false;
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Assert1(BB->getTerminator(), "Basic Block does not have terminator!\n", BB);
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// Verify all instructions, except the terminator...
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Broken |= reduce_apply_bool(BB->begin(), BB->end()-1, verifyInstruction);
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return Broken;
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}
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// verifySymbolTable - Verify that a method or module symbol table is ok
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//
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static bool verifySymbolTable(const SymbolTable *ST) {
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if (ST == 0) return false;
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bool Broken = false;
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// Loop over all of the types in the symbol table...
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for (SymbolTable::const_iterator TI = ST->begin(), TE = ST->end();
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TI != TE; ++TI)
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for (SymbolTable::type_const_iterator I = TI->second.begin(),
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E = TI->second.end(); I != E; ++I) {
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Value *V = I->second;
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// Check that there are no void typed values in the symbol table. Values
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// with a void type cannot be put into symbol tables because they cannot
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// have names!
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Assert1(V->getType() != Type::VoidTy,
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"Values with void type are not allowed to have names!\n", V);
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}
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return Broken;
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}
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// verifyMethod - Verify that a method is ok. Return true if not so that
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// verifyModule and direct clients of the verifyMethod function are correctly
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// informed.
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//
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bool verifyMethod(const Function *F) {
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if (F->isExternal()) return false; // Can happen if called by verifyModule
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bool Broken = verifySymbolTable(F->getSymbolTable());
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Assert1(!F->isExternal() || F->hasExternalLinkage(),
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"Function cannot be an 'internal' 'declare'ation!", F);
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const BasicBlock *Entry = F->getEntryNode();
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Assert1(pred_begin(Entry) == pred_end(Entry),
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"Entry block to method must not have predecessors!", Entry);
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Broken |= reduce_apply_bool(F->begin(), F->end(), verifyBasicBlock);
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return Broken;
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}
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namespace { // Anonymous namespace for class
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struct VerifierPass : public MethodPass {
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bool doInitialization(Module *M) {
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verifySymbolTable(M->getSymbolTable());
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return false;
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}
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bool runOnMethod(Function *F) { verifyMethod(F); return false; }
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};
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}
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Pass *createVerifierPass() {
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return new VerifierPass();
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}
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// verifyModule - Check a module for errors, printing messages on stderr.
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// Return true if the module is corrupt.
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//
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bool verifyModule(const Module *M) {
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return verifySymbolTable(M->getSymbolTable()) |
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reduce_apply_bool(M->begin(), M->end(), verifyMethod);
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}
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