如何使用LLVM函数pass找出调用站点的循环深度?
我需要使用LLVM函数传递找出函数调用站点(或任何指令)的嵌套级别。我已经编写了下面的代码,但它总是返回0作为嵌套级别如何使用LLVM函数pass找出调用站点的循环深度?,llvm,llvm-c++-api,Llvm,Llvm C++ Api,我需要使用LLVM函数传递找出函数调用站点(或任何指令)的嵌套级别。我已经编写了下面的代码,但它总是返回0作为嵌套级别 virtual bool runOnFunction(Function &F) { LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo(); errs() << "Function: " << F.getName() << "\n";
virtual bool runOnFunction(Function &F) {
LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
errs() << "Function: " << F.getName() << "\n";
for (User *U : F.users()) {
CallSite CS(dyn_cast<Instruction>(U));
Function *callerFn = CS.getCaller();
if (callerFn && !callerFn->isDeclaration()) {
errs() <<callerFn->getName() << "--> " << F.getName()<<"\n";
Instruction *callInstr = CS.getInstruction();
BasicBlock *callerBB = callInstr->getParent();
callerBB->dump();
bool isLoop = LI.getLoopFor(callerBB);
errs()<<"Is Loop: "<<isLoop<<"\n";
int LoopDepth = LI.getLoopDepth(callerBB);
errs()<<"Loop Depth: "<< LoopDepth <<"\n";
}
}
virtualbool runOnFunction(函数&F){
LoopInfo&LI=getAnalysis().getLoopInfo();
errs()
我需要找出函数调用站点(或任何
(关于这一点,请参见说明)
对于循环,可以通过以下方式编辑过程来执行此操作:
namespace {
struct LoopDepthPass: public FunctionPass {
static char ID;
LoopDepthPass: () : FunctionPass(ID) {}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
AU.addRequired<LoopInfoWrapperPass>();
}
bool runOnFunction(Function& F) override {
LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
for (LoopInfo::iterator LIT = LI.begin(); LIT != LI.end(); ++LIT) {
Loop* ll = *LIT;
ll->dump();
}
return false;
}
};
产出将是:
Loop at depth 1 containing: %for.cond<header><exiting>,%for.body,%for.cond.1,%for.end,%for.inc.7<latch>,%for.body.4,%for.inc
Loop at depth 2 containing: %for.cond.1<header><exiting>,%for.body.4,%for.inc<latch>
深度1处的循环包含以下内容:%for.cond、.body、.cond.1、.end、.inc.7、.body.4、.inc
深度2处的循环包含:%for.cond.1、%for.body.4、%for.inc
我已打印出循环->转储()
,您也可以轻松地将其改编为其他属性
Loop at depth 1 containing: %for.cond<header><exiting>,%for.body,%for.cond.1,%for.end,%for.inc.7<latch>,%for.body.4,%for.inc
Loop at depth 2 containing: %for.cond.1<header><exiting>,%for.body.4,%for.inc<latch>