How to create own Transforms pass directory in llvm-3.4

Step 1: Go to the llvm Transforms directory and create directory MyLLVMPasses 

            (you can give any directory name)

cd llvm/lib/Transforms mkdir MyLLVMPasses

Step 2: Add directory name MyLLVMPasses in Transforms/CmakeLists.txt file 

add_subdirectory(MyLLVMPasses)

Step 3: Add directory name MyLLVMPasses in Transforms/LLVMBuild.txt file

[common] subdirectories = IPO InstCombine Instrumentation Scalar Utils Vectorize ObjCARC MyLLVMPasses

Step 4: Add directory name MyLLVMPasses in Transforms/Makefile file

PARALLEL_DIRS = Utils Instrumentation Scalar InstCombine IPO Vectorize Hello ObjCARC MyLLVMPasses

Step 5: Create CmakeLists.txt file in  MyLLVMPasses directory and write these lines

add_llvm_library(LLVMMyLLVMPasses   ) add_dependencies(LLVMMyLLVMPasses intrinsics_gen)

Step 6: Create LLVMBuild.txt file in MyLLVMPasses directory and write these lines

[component_0] type = Library name = MyLLVMPasses parent = Transforms library_name = MyLLVMPasses required_libraries = Analysis Core Support Target TransformUtils

Step 7:  Create Makefile in MyLLVMPasses directory and write these lines

LEVEL = ../../.. LIBRARYNAME = LLVMMyLLVMPasses BUILD_ARCHIVE = 1 include $(LEVEL)/Makefile.common

Step 8: Create MyLLVMPasses.cpp file in MyLLVMPasses directory and write these lines

#include "llvm/Transforms/MyLLVMPasses.h" #include "llvm-c/Initialization.h" #include "llvm-c/Transforms/MyLLVMPasses.h" #include "llvm/Analysis/Passes.h" #include "llvm/IR/Verifier.h" #include "llvm/InitializePasses.h" #include "llvm/PassManager.h" using namespace llvm; // initializeMyLLVMPasses - Initialize all passes linked into the // MyLLVMPasses library. void llvm::initializeMyLLVMPasses(PassRegistry &Registry) {   // nothing is needed here yet } void LLVMInitializeMyLLVMPasses(LLVMPassRegistryRef R) {   initializeMyLLVMPasses(*unwrap(R)); }

Step 9: Create MyLLVMPasses.h file in llvm/include/llvm/Transforms and write these lines

#ifndef LLVM_TRANSFORMS_MYLLVMPASSES_H #define LLVM_TRANSFORMS_MYLLVMPASSES_H #include "llvm/ADT/StringRef.h" namespace llvm { class FunctionPass; class Pass; } // End llvm namespace #endif

Step 10: Create MyLLVMPasses.h file in llvm/include/llvm-c/Transforms and write these lines

#ifndef LLVM_C_TRANSFORMS_MYLLVMPASSES_H #define LLVM_C_TRANSFORMS_MYLLVMPASSES_H #include "llvm-c/Core.h" #ifdef __cplusplus extern "C" { #endif // LLVMCTransformsMyLLVMPasses MyLLVMPasses transformations #ifdef __cplusplus } #endif /* defined(__cplusplus) */ #endif

Step 11: Open llvm/include/llvm-c/Initialization.h file, add this line

void LLVMInitializeMyLLVMPasses(LLVMPassRegistryRef R);

Step 12: Open llvm/include/llvm/InitializePasses.h file, add this line

// initializeMyLLVMPasses - Initialize all passes linked into the // MyLLVMPasses library. void initializeMyLLVMPasses(PassRegistry&);

Step 13: Add directory name MyLLVMPasses in lib/Transforms/IPO/LLVMBuild.txt file

[component_0] type = Library name = IPO parent = Transforms library_name = ipo required_libraries = Analysis Core IPA InstCombine Scalar Support Target TransformUtils Vectorize MyLLVMPasses

Step 14: Include MyLLVMPasses.h file in llvm/include/llvm/LinkAllPasses.h file

#include "llvm/Transforms/MyLLVMPasses.h"

Step 15: Include MyLLVMPasses.h file in llvm/tools/clang/lib/CodeGen/BackendUtil.cpp file

#include "llvm/Transforms/MyLLVMPasses.h"

see How to create LLVM Transforms pass