dds(iceoryx、fastdds等)中间件采用了共享内存，如果app内存越界将共享内存踩踏坏了，将会形成灾难。本插件可以检测到app是否在写共享内存，如果是，我们可以让app assert。从而提高dds的稳定性
插件效果：
插件源码：
#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"; // 日志打印函数调用
InsertStubPass() : FunctionPass(ID) {}
bool runOnFunction(Function &F) override {
errs().write_escaped(F.getName()) << "-----------\n";
if(F.getName() != "init_ring_buffer")
return true;
// 字符串类型
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";
// 检查是否为mov指令
if ( auto *MOV = dyn_cast<StoreInst>(&I) ) {
errs().write_escaped("store ins") << "-----------\n";
// 在mov指令前插入一个空的call指令作为插桩
IRBuilder<> builder(MOV);
// ReturnInst i;
Value *PointerOperand = MOV->getPointerOperand();
errs() << "Store address: " << *PointerOperand << "\n";
Value *AddrOp = builder.CreatePointerCast(PointerOperand, builder.getInt8PtrTy());
// 该函数的指针变量
// Value *strPointer = builder.CreateGlobalStringPtr(f.getName());
// 自己定义的 日志函数
std::vector<Value *> args;
args.push_back(AddrOp); // 生成日志函数 的参数列表
// 创建自己的日志函数 并传入 本函数的函数指针
CallInst::Create(logFunction, args, "", MOV);
// 可以在这里添加插桩的相关信息，例如标记插桩的名称或其他属性
// StubCall->setName("stub_instruction");
// 如果需要追踪插桩的执行情况，可以在这里添加分析或者断言
// 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);
