llvm指令错误:: getOpcode（）和getOpcodeName

Question

我发现我的llvm pass项目可能存在一些错误。我写了一个小程序，试图打印出所有指令及其相应的操作码。我使用Instruction :: getOpcode（）和Instruction :: getOpcodeName（）。

但结果看起来有点奇怪。以下是我的结果：

  %1 = alloca i32, align 4
load
  %a = alloca i32, align 4
load
  %b = alloca i32, align 4
load
  store i32 0, i32* %1
getelementptr
  %2 = call i64 @time(i64* null) #3
select
  %3 = trunc i64 %2 to i32
zext
  call void @srand(i32 %3) #3
select
  %4 = call i32 @rand() #3
select
  %5 = srem i32 %4, 10
frem
  store i32 %5, i32* %a, align 4
getelementptr
  %6 = call i32 @rand() #3
select
  %7 = srem i32 %6, 10
frem
  store i32 %7, i32* %b, align 4
getelementptr
  %8 = load i32* %a, align 4
store
  %9 = load i32* %b, align 4
store
  %10 = icmp sgt i32 %8, %9
fcmp
  br i1 %10, label %11, label %14
switch
  %12 = load i32* %a, align 4
store
  %13 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i32 0, i32 0), i32 %12)
select
  br label %17
switch
  %15 = load i32* %b, align 4
store
  %16 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i32 0, i32 0), i32 %15)
select
  br label %17
switch
  %18 = load i32* %1
store
  ret i32 %18
br

我尝试在指令后打印出每个指令opcodeName，但每条指令都得到一个错误的opcodeName。我还检查了每个opcodeName的操作码，它们也是错误的。我不确切知道在哪里找到指令列表的枚举，但我想我以前找过它，并且错误的opcodeName与操作码相关。看起来他们都从右侧案件转移了2个单位。

你有没有遇到过这样的问题？

我还附上了我的llvm传递的代码，如下所示：

#include "llvm/ADT/Statistic.h"
#include "llvm/IR/Function.h"
#include "llvm/Pass.h"
#include "llvm/Support/raw_ostream.h"
#include "llvmFaultInjector.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/BasicBlock.h"
#include <iostream>
#include <cstdlib>

using namespace llvm;

namespace {
  // Hello - The first implementation, without getAnalysisUsage.
  struct Hello : public ModulePass {
    static char ID; // Pass identification, replacement for typeid
    Hello() : ModulePass(ID) {}

    bool runOnModule(Module &M) override {
        Module::iterator fi, fie;
        Function::iterator bi, bie;
        BasicBlock::iterator ii, iie;

        /* test a example : delete first instruction of test file */
        Instruction * inst;

        for(fi = M.begin(), fie = M.end(); fi != fie; fi++)
        {
            for(bi = fi->begin(), bie = fi->end(); bi != bie; bi++)
            {
                for(ii = bi->begin(), iie = bi->end(); ii != iie; ii++)
                {
                    inst = (Instruction *)(ii);
                    errs() << *inst << '\n';
                    errs() << inst->getOpcodeName() << '\n';
                }
            }
        }

        /* delete instruction*/
        /*llvmFaultInjector::tranBranchDelete(inst);
        */      
        return true;
    }
  };
}

char Hello::ID = 0;
static RegisterPass<Hello> X("CFCFaultInject", "llvm CFCFaultInjector");