一.下载

llvm_source.zip

二. 安装

三. 编译

1. 打开LLVM.xcodeproj
2. 选择Automatically Create Schemes
3. 创建Custom Aggregate
4. 进入Build Phases
5. 点击Dependencies
6. 添加opt,clang以及需要编译的pass
7. command+B 开始编译

四. 解决Pass无法加载

使用LLVM工程自带实例LLVMHello

路径：根目录/llvm_project/llvm/lib/transforms/Hello/Hello.cpp

1. 打开[CustomPass].cpp
2. 添加两个头文件

   1 2	#include "llvm/IR/LegacyPassManager.h" #include "llvm/Transforms/IPO/PassManagerBuilder.h"

3. 添加自动注册Pass代码

   1 2 3 4 5 6

   static void registerSkeletonPass(const PassManagerBuilder &, legacy::PassManagerBase &PM) {    PM.add(new Hello()); }   static RegisterStandardPasses RegisterMyPass(PassManagerBuilder::EP_EarlyAsPossible, registerSkeletonPass);

五. 在XCode中添加Pass

1. 打开Project选择Target
2. 点击Build Settings
3. 添加User-Defined，命名为CC,值为根目录/llvm_project-build/Debug/bin/clang
4. 添加User-Defined，命名为CXX,值为根目录/llvm_project-build/Debug/bin/clang++
5. 点击other c flags,添加-Xclang -load -Xclang /Volumes/T.SSD/LLVM/llvm-project-build/Debug/lib/[Pass名称].dylib
6. 点击enable index-while-building funcationality,将属性值改为NO
7. command+B编译
   • 编译出错function does not return or could not build module **
     • 点击other c flags,追加-DNS_FORMAT_ARGUMENT(A)= -D_Nullable_result=_Nullable，重新进行编译
   • 成功后会打印

     1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

     Hello: \001+[OMGameHandle shared] Hello: _dispatch_once Hello: __22+[GHandle shared]_block_invoke Hello: \001-[GameHandle setup] Hello: \001-[GameHandle agreeProtocol] Hello: \001-[GameHandle initWithStatus:] Hello: \001-[GameHandle loginWithSuccess:] Hello: \001-[GameHandle loginWithSignout] Hello: \001-[GameHandle loginWithFailure:] Hello: \001-[GameHandle login] Hello: \001-[GameHandle setupBlock] Hello: \001-[GameHandle setSetupBlock:] Hello: \001-[GameHandle vc] Hello: \001-[GameHandle setVc:] Hello: \001-[GameHandle .cxx_destruct]

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