LLVM防忘录
目录
- Windows中源码编译LLVM
- Windows下编译LLVM Pass DLL
Windows中源码编译LLVM
直接从llvm-project下载源码, 然后解压后用VS2022打开该目录, 然后利用VS的开发终端执行:
cmake -S llvm -B build -G "Visual Studio 17 2022" -DLLVM_ENABLE_PROJECTS=clang -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_ENABLE_PLUGINS=On -DCMAKE_CXX_FLAGS=/utf-8
然后关闭VS进入build目录, 打开.sln文件直接利用VS进行编译, 期间可能会遇到一些报错, 大概率都是utf-8等编码的问题, 小小的修理一下就可以…
参考:
- http://www.qfrost.com/posts/llvm/llvm%E7%BC%96%E8%AF%91%E4%B8%8Efirst_pass
- https://bbs.kanxue.com/thread-279734.htm
- https://blog.csdn.net/hfcaoguilin/article/details/128095147
Windows下编译LLVM Pass DLL
HelloWorld.cpp:
#include <iostream>
#include "llvm/IR/Module.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Support/raw_ostream.h"#pragma comment(lib,"ntdll.lib")using namespace llvm;
namespace llvm{struct NewPassHelloWorld : public PassInfoMixin<NewPassHelloWorld> {PreservedAnalyses run(Module &F, ModuleAnalysisManager &AM) {std::cout << "NewPassHelloWorld Loaded" << std::endl;errs() << "Pass:" << F.getName() << "\n";return PreservedAnalyses::all();}bool isRequird(){ return true; }};}
// This part is the new way of registering your pass
extern "C" ::llvm::PassPluginLibraryInfoLLVM_ATTRIBUTE_WEAK llvmGetPassPluginInfo() {return { LLVM_PLUGIN_API_VERSION, "HelloWorld", LLVM_VERSION_STRING,[](llvm::PassBuilder& PB) {PB.registerPipelineStartEPCallback([&](llvm::ModulePassManager& MPM,OptimizationLevel Level) {MPM.addPass(NewPassHelloWorld());});} };
}
export.def:
LIBRARY QVMProtect
EXPORTS
llvmGetPassPluginInfo
CMakeLists.txt
cmake_minimum_required(VERSION 3.4)project(QVMProtect)
set(CMAKE_CXX_STANDARD 17)
# 设置编译模式
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MD") # /MD for release
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /MDd") # /MDd for debug# 设置源码文件
aux_source_directory(./ src)
set(srcs ${src})# 生成动态链接库，并指定.def模块文件
add_library(QVMProtect SHARED ${srcs} export.def)# 设置LLVM的路径 (绝对路径或环境变量)
set(LLVM_BUILD_DIR "D:\\Demo\\llvm-project\\build")
set(LLVM_SOURCE_DIR "D:\\Demo\\llvm-project\\llvm")
include_directories("${LLVM_BUILD_DIR}\\include")
include_directories("${LLVM_SOURCE_DIR}\\include")# 添加LLVM的库路径
set(mylibdir "${LLVM_BUILD_DIR}\\Release\\lib")# 链接LLVM所需库 (根据你的项目需要，可能需要添加其他库)
set(LLVM_LIBSLLVMCoreLLVMSupportLLVMBinaryFormatLLVMRemarksLLVMBitstreamReaderLLVMTargetLLVMDemangleLLVMTargetParser
)# 查找并链接库
foreach(libname ${LLVM_LIBS})SET(FOUND_LIB "FOUND_LIB-NOTFOUND")find_library(FOUND_LIB NAMES ${libname} HINTS ${mylibdir} NO_DEFAULT_PATH)IF (FOUND_LIB)message("found lib: ${FOUND_LIB}")LIST(APPEND mylibs ${FOUND_LIB})ELSE()MESSAGE("not lib found: ${libname}")ENDIF ()
endforeach(libname)# 添加Windows特定库
list(APPEND mylibs ntdll.lib)# 链接库
target_link_libraries(QVMProtect PUBLIC ${mylibs})
然后在VS开发CMD中执行:
mkdir build
cd build
cmake ..
然后同样会生产VS项目, 打开.sln文件进行编译即可;
编译的时候可能会遇到找不到符号的错误, 例如:
严重性 代码 说明 项目 文件 行 禁止显示状态 详细信息
错误 LNK2019 无法解析的外部符号 "public: __cdecl llvm::Triple::Triple(class llvm::Twine const &)" (??0Triple@llvm@@QEAA@AEBVTwine@1@@Z)，函数 "public: bool __cdecl llvm::GlobalObject::canIncreaseAlignment(void)const " (?canIncreaseAlignment@GlobalObject@llvm@@QEBA_NXZ) 中引用了该符号 QVMProtect D:\Demo\TestPass\build\LLVMCore.lib(Globals.obj) 1
需要在你编译好的llvm的lib目录中找找哪个lib包含相关的符号了;
编译好的Pass是一个DLL, 可以用clang直接加载:
D:\Demo\llvm-project\build\Release\bin\clang++.exe -Xclang -fpass-plugin="D:\Demo\TestPass\build\Release\QVMProtect.dll" exp.cpp -o exp.exe
