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//===- PNaClABIVerifyFunctions.cpp - Verify PNaCl ABI rules --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Verify function-level PNaCl ABI requirements.
//
//
//===----------------------------------------------------------------------===//
#include "llvm/Pass.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Analysis/NaCl.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Metadata.h"
#include "llvm/Support/raw_ostream.h"
#include "PNaClABITypeChecker.h"
using namespace llvm;
namespace {
// Checks that examine anything in the function body should be in
// FunctionPasses to make them streaming-friendly
class PNaClABIVerifyFunctions : public FunctionPass {
public:
static char ID;
PNaClABIVerifyFunctions() :
FunctionPass(ID),
Reporter(new PNaClABIErrorReporter),
ReporterIsOwned(true) {
initializePNaClABIVerifyFunctionsPass(*PassRegistry::getPassRegistry());
}
explicit PNaClABIVerifyFunctions(PNaClABIErrorReporter *Reporter_) :
FunctionPass(ID),
Reporter(Reporter_),
ReporterIsOwned(false) {
initializePNaClABIVerifyFunctionsPass(*PassRegistry::getPassRegistry());
}
~PNaClABIVerifyFunctions() {
if (ReporterIsOwned)
delete Reporter;
}
bool runOnFunction(Function &F);
virtual void print(raw_ostream &O, const Module *M) const;
private:
PNaClABITypeChecker TC;
PNaClABIErrorReporter *Reporter;
bool ReporterIsOwned;
};
} // and anonymous namespace
bool PNaClABIVerifyFunctions::runOnFunction(Function &F) {
// TODO: only report one error per instruction?
for (Function::const_iterator FI = F.begin(), FE = F.end();
FI != FE; ++FI) {
for (BasicBlock::const_iterator BBI = FI->begin(), BBE = FI->end();
BBI != BBE; ++BBI) {
switch (BBI->getOpcode()) {
// Disallowed instructions. Default is to disallow.
default:
// indirectbr may interfere with streaming
case Instruction::IndirectBr:
// No vector instructions yet
case Instruction::ExtractElement:
case Instruction::InsertElement:
case Instruction::ShuffleVector:
Reporter->addError() << "Function " << F.getName() <<
" has disallowed instruction: " <<
BBI->getOpcodeName() << "\n";
break;
// Terminator instructions
case Instruction::Ret:
case Instruction::Br:
case Instruction::Switch:
case Instruction::Resume:
case Instruction::Unreachable:
case Instruction::Invoke:
// Binary operations
case Instruction::Add:
case Instruction::FAdd:
case Instruction::Sub:
case Instruction::FSub:
case Instruction::Mul:
case Instruction::FMul:
case Instruction::UDiv:
case Instruction::SDiv:
case Instruction::FDiv:
case Instruction::URem:
case Instruction::SRem:
case Instruction::FRem:
// Bitwise binary operations
case Instruction::Shl:
case Instruction::LShr:
case Instruction::AShr:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor:
case Instruction::ExtractValue:
case Instruction::InsertValue:
// Memory instructions
case Instruction::Alloca:
case Instruction::Load:
case Instruction::Store:
case Instruction::Fence:
case Instruction::AtomicCmpXchg:
case Instruction::AtomicRMW:
case Instruction::GetElementPtr:
// Conversion operations
case Instruction::Trunc:
case Instruction::ZExt:
case Instruction::SExt:
case Instruction::FPTrunc:
case Instruction::FPExt:
case Instruction::FPToUI:
case Instruction::FPToSI:
case Instruction::UIToFP:
case Instruction::SIToFP:
case Instruction::PtrToInt:
case Instruction::IntToPtr:
case Instruction::BitCast:
// Other operations
case Instruction::ICmp:
case Instruction::FCmp:
case Instruction::PHI:
case Instruction::Select:
case Instruction::Call:
case Instruction::VAArg:
case Instruction::LandingPad:
break;
}
// Check the types. First check the type of the instruction.
if (!TC.isValidType(BBI->getType())) {
Reporter->addError() << "Function " << F.getName() <<
" has instruction with disallowed type: " <<
PNaClABITypeChecker::getTypeName(BBI->getType()) << "\n";
}
// Check the instruction operands. Operands which are Instructions will
// be checked on their own here, and GlobalValues will be checked by the
// Module verifier. That leaves Constants.
// Switches are implemented in the in-memory IR with vectors, so don't
// check them.
if (!isa<SwitchInst>(*BBI))
for (User::const_op_iterator OI = BBI->op_begin(), OE = BBI->op_end();
OI != OE; OI++) {
if (isa<Constant>(OI) && !isa<GlobalValue>(OI)) {
Type *T = TC.checkTypesInConstant(cast<Constant>(*OI));
if (T) {
Reporter->addError() << "Function " << F.getName() <<
" has instruction operand with disallowed type: " <<
PNaClABITypeChecker::getTypeName(T) << "\n";
}
}
}
// Get types hiding in metadata attached to the instruction
SmallVector<std::pair<unsigned, MDNode*>, 4> MDForInst;
BBI->getAllMetadataOtherThanDebugLoc(MDForInst);
for (unsigned i = 0, e = MDForInst.size(); i != e; i++) {
Type *T = TC.checkTypesInMDNode(MDForInst[i].second);
if (T) {
Reporter->addError() << "Function " << F.getName() <<
" has instruction metadata containing disallowed type: " <<
PNaClABITypeChecker::getTypeName(T) << "\n";
}
}
}
}
return false;
}
// This method exists so that the passes can easily be run with opt -analyze.
// In this case the default constructor is used and we want to reset the error
// messages after each print.
void PNaClABIVerifyFunctions::print(llvm::raw_ostream &O, const Module *M)
const {
Reporter->printErrors(O);
Reporter->reset();
}
char PNaClABIVerifyFunctions::ID = 0;
INITIALIZE_PASS(PNaClABIVerifyFunctions, "verify-pnaclabi-functions",
"Verify functions for PNaCl", false, true)
FunctionPass *llvm::createPNaClABIVerifyFunctionsPass(
PNaClABIErrorReporter *Reporter) {
return new PNaClABIVerifyFunctions(Reporter);
}
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