我正在学习LLVM Essentials这本书上的一个例子，这个部分叫做生成if-else条件IR，但我一直遇到以下错误。
Assertion failed: (getOperand(0)->getType() == getOperand(1)->getType()
&& "Both operands to ICmp instruction are not of the same type!"),
function AssertOK,
file /usr/local/Cellar/llvm/3.6.2/include/llvm/IR/Instructions.h, line
997. Abort trap: 6
我花了好几个小时试图弄清楚这个问题，但是我已经束手无策了。我相信这只是一个小问题，但我毫无头绪。下面是我使用的代码。
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include <vector>
#include <iostream>
#include <typeinfo>
using namespace llvm;
static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new Module("my compiler", Context);
static std::vector<std::string> FunArgs;
typedef SmallVector<BasicBlock *, 16> BBList;
typedef SmallVector<Value *, 16> ValList;
Function *createFunc(IRBuilder<> &Builder, std::string Name) {
std::vector<Type *> Integers(FunArgs.size(), Type::getInt32Ty(Context));
FunctionType *funcType =
llvm::FunctionType::get(Builder.getInt32Ty(), Integers, false);
Function *fooFunc = llvm::Function::Create(
funcType, llvm::Function::ExternalLinkage, Name, ModuleOb);
return fooFunc;
}
void setFuncArgs(Function *fooFunc, std::vector<std::string> FunArgs) {
unsigned Idx = 0;
Function::arg_iterator AI, AE;
for (AI = fooFunc->arg_begin(), AE = fooFunc->arg_end(); AI != AE;
++AI, ++Idx)
AI->setName(FunArgs[Idx]);
}
BasicBlock *createBB(Function *fooFunc, std::string Name) {
return BasicBlock::Create(Context, Name, fooFunc);
}
GlobalVariable *createGlob(IRBuilder<> &Builder, std::string Name) {
ModuleOb->getOrInsertGlobal(Name, Builder.getInt32Ty());
GlobalVariable *gVar = ModuleOb->getNamedGlobal(Name);
gVar->setLinkage(GlobalValue::CommonLinkage);
gVar->setAlignment(4);
return gVar;
}
Value *createArith(IRBuilder<> &Builder, Value *L, Value *R) {
return Builder.CreateMul(L, R, "multmp");
}
Value *createIfElse(IRBuilder<> &Builder, BBList List, ValList VL) {
Value *Condtn = VL[0];
Value *Arg1 = VL[1];
BasicBlock *ThenBB = List[0];
BasicBlock *ElseBB = List[1];
BasicBlock *MergeBB = List[2];
Builder.CreateCondBr(Condtn, ThenBB, ElseBB);
Builder.SetInsertPoint(ThenBB);
Value *ThenVal = Builder.CreateAdd(Arg1, Builder.getInt32(1), "thenaddtmp");
Builder.CreateBr(MergeBB);
Builder.SetInsertPoint(ElseBB);
Value *ElseVal = Builder.CreateAdd(Arg1, Builder.getInt32(2), "elseaddtmp");
Builder.CreateBr(MergeBB);
unsigned PhiBBSize = List.size() - 1;
Builder.SetInsertPoint(MergeBB);
PHINode *Phi = Builder.CreatePHI(Type::getInt32Ty(getGlobalContext()), PhiBBSize, "iftmp");
Phi->addIncoming(ThenVal, ThenBB);
Phi->addIncoming(ElseVal, ElseBB);
return Phi;
}
int main(int argc, char *argv[]) {
FunArgs.push_back("a");
FunArgs.push_back("b");
static IRBuilder<> Builder(Context);
GlobalVariable *gVar = createGlob(Builder, "x");
Function *fooFunc = createFunc(Builder, "foo");
setFuncArgs(fooFunc, FunArgs);
BasicBlock *entry = createBB(fooFunc, "entry");
Builder.SetInsertPoint(entry);
Value *Arg1 = fooFunc->arg_begin();
Value *constant = Builder.getInt32(16);
Value *val = createArith(Builder, Arg1, constant);
Value *val2 = Builder.getInt32(100);
Value *Compare = Builder.CreateICmpULT(val, val2, "cmptmp");
Value *Condtn = Builder.CreateICmpNE(Compare, Builder.getInt32(0), "ifcond");
ValList VL;
VL.push_back(Condtn);
VL.push_back(Arg1);
BasicBlock *ThenBB = createBB(fooFunc, "then");
BasicBlock *ElseBB = createBB(fooFunc, "else");
BasicBlock *MergeBB = createBB(fooFunc, "ifcont");
BBList List;
List.push_back(ThenBB);
List.push_back(ElseBB);
List.push_back(MergeBB);
Value *v = createIfElse(Builder, List, VL);
Builder.CreateRet(v);
verifyFunction(*fooFunc);
ModuleOb->dump();
return 0;
}
我知道这个问题发生在这个位置。我尝试动态将两个对象转换为相同的类型，但仍然无法编译。
Value *Condtn = Builder.CreateICmpNE(Compare, Builder.getInt32(0), "ifcond");