我开始学习LLVM API,并写了我的第一个Pass。我的目标是打印函数之间的调用关系。
最近,我想在显示上添加一些循环信息,以查看一个函数是否可以被多次调用。但是当我尝试使用LoopInfo时,我遇到了这个编译错误:
llvm[0]: Compiling cfg.cpp for Debug+Asserts build (PIC)
In file included from cfg.cpp:19:
In file included from /home/llvm-lab/llvm/include/llvm/Pass.h:378:
/home/llvm-lab/llvm/include/llvm/PassAnalysisSupport.h:56:37: error:
no member named 'ID' in 'llvm::LoopInfo'
return addRequiredID(PassClass::ID);
^
cfg.cpp:33:10: note: in instantiation of function template
specialization 'llvm::AnalysisUsage::addRequired<llvm::LoopInfo>'
requested here
AU.addRequired<LoopInfo>();
^
1 error generated.
这是我的代码:
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/raw_ostream.h"
#include "iostream"
#include "llvm/Pass.h"
#include "llvm/IR/InstIterator.h"
#include <llvm/IR/Instructions.h>
#include <llvm/Analysis/LoopInfo.h>
using namespace llvm;
namespace {
struct CFG : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
CFG() : FunctionPass(ID) {}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<LoopInfo>();
}
bool runOnFunction(Function &F) override {
errs().write_escaped(F.getName());
errs() << " : ";
for( Function::iterator b = F.begin() , be = F.end(); b != be; ++b){
errs() << "\n\t BB : ";
LoopInfo *loop = new LoopInfo();
bool isLoop = loop->getLoopFor(b);
if(isLoop){
errs() << "loop{";
}
for(BasicBlock::iterator i = b->begin() , ie = b->end(); i!=ie; ++i){
if( isa<CallInst>(&(*i)) || isa<InvokeInst>(&(*i))){
errs() << cast<CallInst>(&(*i))->getCalledFunction()->getName() << "\t";
}
}
if(isLoop){
errs() << "}";
}
}
errs() << '\n';
return false;
}
};
}
char CFG::ID = 0;
static RegisterPass<CFG> X("CFG", "Gen CFG",true ,true);
我在任何地方都找不到关于“llvm::LoopInfo中没有名为'ID'的成员”的参考错误,有人知道出了什么问题吗?