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Teach the verifier to check the condition on a branch and ensure that it has

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'i1' type.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96282 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2010-02-15 22:09:09 +00:00
parent 8eea48a43d
commit 6a7cb63f6f
2 changed files with 53 additions and 0 deletions
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9
lib/VMCore/Verifier.cpp
View File

@ -317,6 +317,7 @@ namespace {
void visitStoreInst(StoreInst &SI);
void visitInstruction(Instruction &I);
void visitTerminatorInst(TerminatorInst &I);
void visitBranchInst(BranchInst &BI);
void visitReturnInst(ReturnInst &RI);
void visitSwitchInst(SwitchInst &SI);
void visitSelectInst(SelectInst &SI);
@ -749,6 +750,14 @@ void Verifier::visitTerminatorInst(TerminatorInst &I) {
visitInstruction(I);
}
void Verifier::visitBranchInst(BranchInst &BI) {
if (BI.isConditional()) {
Assert2(BI.getCondition()->getType()->isIntegerTy(1),
"Branch condition is not 'i1' type!", &BI, BI.getCondition());
}
visitTerminatorInst(BI);
}
void Verifier::visitReturnInst(ReturnInst &RI) {
Function *F = RI.getParent()->getParent();
unsigned N = RI.getNumOperands();

44
unittests/VMCore/VerifierTest.cpp Normal file
View File

@ -0,0 +1,44 @@
//===- llvm/unittest/VMCore/VerifierTest.cpp - Verifier unit tests --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/LLVMContext.h"
#include "llvm/Analysis/Verifier.h"
#include "gtest/gtest.h"
namespace llvm {
namespace {
TEST(VerifierTest, Branch_i1) {
LLVMContext &C = getGlobalContext();
FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
Function *F = Function::Create(FTy, GlobalValue::ExternalLinkage);
BasicBlock *Entry = BasicBlock::Create(C, "entry", F);
BasicBlock *Exit = BasicBlock::Create(C, "exit", F);
ReturnInst::Create(C, Exit);
// To avoid triggering an assertion in BranchInst::Create, we first create
// a branch with an 'i1' condition ...
Constant *False = ConstantInt::getFalse(C);
BranchInst *BI = BranchInst::Create(Exit, Exit, False, Entry);
// ... then use setOperand to redirect it to a value of different type.
Constant *Zero32 = ConstantInt::get(IntegerType::get(C, 32), 0);
BI->setOperand(0, Zero32);
EXPECT_TRUE(verifyFunction(*F, ReturnStatusAction));
}
}
}