dds(iceoryx、fastdds等)中間件采用了共享內存，如果app內存越界將共享內存踩踏壞了，將會形成災難。本插件可以檢測到app是否在寫共享內存，如果是，我們可以讓app assert。從而提高dds的穩定性

插件效果：

插件源碼：

#include "llvm/Pass.h"

#include "llvm/IR/Function.h"

#include "llvm/IR/BasicBlock.h"

#include "llvm/IR/Instructions.h"

#include "llvm/Support/raw_ostream.h"

#include "llvm/Pass.h"

#include "llvm/IR/Constants.h"

#include "llvm/Support/CommandLine.h"

#include "llvm/IR/IRBuilder.h"

#include "llvm/IR/Value.h"

#include "llvm/IR/Module.h"

#include "llvm/IR/Function.h"

#include "llvm/IR/BasicBlock.h"

#include "llvm/IR/Instruction.h"

#include "llvm/IR/Instructions.h"

#include "llvm/Support/raw_ostream.h"

#include "llvm/IR/IntrinsicInst.h"

using namespace llvm;

namespace {

struct InsertStubPass : public FunctionPass {

static char ID;

const char *LOG_FUNCTION_STR = "log_function_call"; // 日志打印函數調用

InsertStubPass() : FunctionPass(ID) {}

bool runOnFunction(Function &F) override {

errs().write_escaped(F.getName()) << "-----------\n";

if(F.getName() != "init_ring_buffer")

return true;

// 字符串類型

Type *StringType = Type::getInt8PtrTy(F.getParent()->getContext());

// void type

Type *voidTy = Type::getVoidTy(F.getParent()->getContext());

bool isVarArg = false;

std::vector<Type*> functionCallParams;

functionCallParams.push_back(StringType);

FunctionType *functionCallType = FunctionType::get(

voidTy, functionCallParams, isVarArg

);

F.getParent()->getOrInsertFunction(LOG_FUNCTION_STR, functionCallType);

Function *logFunction = F.getParent()->getFunction(LOG_FUNCTION_STR);

for (BasicBlock &BB : F) {

for (Instruction &I : BB) {

errs() << I << "+++\n";

// 檢查是否為mov指令

if ( auto *MOV = dyn_cast<StoreInst>(&I) ) {

errs().write_escaped("store ins") << "-----------\n";

// 在mov指令前插入一個空的call指令作為插樁

IRBuilder<> builder(MOV);

// ReturnInst i;

Value *PointerOperand = MOV->getPointerOperand();

errs() << "Store address: " << *PointerOperand << "\n";

Value *AddrOp = builder.CreatePointerCast(PointerOperand, builder.getInt8PtrTy());

// 該函數的指針變量

// Value *strPointer = builder.CreateGlobalStringPtr(f.getName());

// 自己定義的 日志函數

std::vector<Value *> args;

args.push_back(AddrOp); // 生成日志函數 的參數列表

// 創建自己的日志函數 并傳入 本函數的函數指針

CallInst::Create(logFunction, args, "", MOV);

// 可以在這里添加插樁的相關信息，例如標記插樁的名稱或其他屬性

// StubCall->setName("stub_instruction");

// 如果需要追蹤插樁的執行情況，可以在這里添加分析或者斷言

// e.g., llvm::Assume(Builder.CreateICmpEQ(StubCall, StubCall));

}

}

}

return true;

}

};

}

char InsertStubPass::ID = 0;

static RegisterPass<InsertStubPass> X("insert-stub", "Insert a stub instruction before mov instructions", false, false);