project( common_clang )
cmake_minimum_required(VERSION 3.4.3)

# Do not omit TARGET_OBJECTS expression from the SOURCES target
# property
# `cmake --help-policy CMP0051` for details.
cmake_policy(SET CMP0051 NEW)
cmake_policy(SET CMP0057 NEW)
cmake_policy(SET CMP0022 NEW)

set(CMAKE_MODULE_PATH
  ${CMAKE_MODULE_PATH}
  "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")

include(CMakeFunctions)

if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
    set(USE_PREBUILT_LLVM ON)

    add_definitions(-DUSE_PREBUILT_LLVM)

    if(NOT PREFERRED_LLVM_VERSION)
        set(PREFERRED_LLVM_VERSION "11.0.0")
    endif(NOT PREFERRED_LLVM_VERSION)
    message(STATUS "Looking for LLVM version ${PREFERRED_LLVM_VERSION}")
    find_package(LLVM ${PREFERRED_LLVM_VERSION} REQUIRED)

    message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")
    message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")

    set(CMAKE_MODULE_PATH
      ${CMAKE_MODULE_PATH}
      ${LLVM_CMAKE_DIR})

    set(CMAKE_CXX_STANDARD 14)
    set(CMAKE_CXX_STANDARD_REQUIRED ON)

    option(LLVMSPIRV_INCLUDED_IN_LLVM
      "Set to ON if libLLVMSPIRVLib is linked into libLLVM" ON)
    if(LLVMSPIRV_INCLUDED_IN_LLVM)
        message(STATUS "Assuming that libLLVMSPIRVLib is linked into libLLVM")
    else(LLVMSPIRV_INCLUDED_IN_LLVM)
        message(STATUS
          "Assuming that libLLVMSPIRVLib is NOT linked into libLLVM")
        if(NOT SPIRV_TRANSLATOR_DIR)
            message(FATAL_ERROR "SPIRV_TRANSLATOR_DIR is required")
        endif(NOT SPIRV_TRANSLATOR_DIR)
    endif(LLVMSPIRV_INCLUDED_IN_LLVM)
else(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
    set(USE_PREBUILT_LLVM OFF)
    find_package(Git REQUIRED)
endif(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)

include(AddLLVM)
include(TableGen)

if (NOT WIN32)
    add_subdirectory( linux_linker )
endif()

if (CMAKE_SIZEOF_VOID_P EQUAL 4)
    set(ADDR 32)
else ()
    set(ADDR 64)
endif (CMAKE_SIZEOF_VOID_P EQUAL 4)

# set windows binary suffix
if (WIN32)
    set (BUILD_PLATFORM ${ADDR})
else (WIN32)
    set (BUILD_PLATFORM "")
endif (WIN32)

# set that name of the main output file as a target name
if (NOT DEFINED COMMON_CLANG_LIBRARY_NAME)
    set(COMMON_CLANG_LIBRARY_NAME "opencl-clang")
endif()
set(TARGET_NAME ${COMMON_CLANG_LIBRARY_NAME}${BUILD_PLATFORM} )

if(NOT USE_PREBUILT_LLVM)

    if(NOT LLVM_EXTERNAL_CLANG_SOURCE_DIR)
        set(LLVM_BASE_REVISION release_11)
        set(CLANG_SOURCE_DIR ${LLVM_SOURCE_DIR}/tools/clang)
        set(CLANG_BASE_REVISION release_11)
    elseif(EXISTS "${LLVM_EXTERNAL_CLANG_SOURCE_DIR}/CMakeLists.txt")
        set(LLVM_BASE_REVISION release/11.x)
        set(CLANG_SOURCE_DIR "${LLVM_EXTERNAL_CLANG_SOURCE_DIR}")
        set(CLANG_BASE_REVISION release/11.x)
    endif()
    if(EXISTS ${CLANG_SOURCE_DIR})
        message(STATUS "Using Clang source code direcotry: ${CLANG_SOURCE_DIR}")
    else()
        message(FATAL_ERROR
            "Can't find Clang source code directory!\n"
            "If you are using LLVM monorepo:\n"
            "  1. Clean CMake cache: `rm CMakeCache.txt`\n"
            "  2. Enable Clang project with `-DLLVM_ENABLE_PROJECTS=\"clang\"` option\n"
            "If Clang is used as a separate repository (not monorepo), it should "
            "be checked out at `llvm/tools/clang`."
        )
    endif()

    if(NOT LLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR)
        set(SPIRV_SOURCE_DIR ${LLVM_SOURCE_DIR}/projects/llvm-spirv)
    elseif(EXISTS "${LLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR}/CMakeLists.txt")
        set(SPIRV_SOURCE_DIR ${LLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR})
    endif()
    if(EXISTS ${SPIRV_SOURCE_DIR})
        message(STATUS "Using SPIRV-LLVM-Translator source code directory: ${SPIRV_SOURCE_DIR}")
    else()
        message(FATAL_ERROR
            "Can't find SPIRV-LLVM-Translator source code dir!\n"
            "If you are using LLVM monorepo, SPIRV-LLVM-Translator should be checked out "
            "at '<monorepo_root_dir>/llvm-spirv' and it should be enabled as an external LLVM "
            "project using the following 2 options:\n"
            "  -DLLVM_EXTERNAL_PROJECTS=\"opencl-clang;llvm-spirv\"\n"
            "  -DLLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR=\"<monorepo_root_dir>/llvm-spirv\"\n"
            "If you are not using LLVM monorepo, SPIRV-LLVM-Translator should be checked "
            "out at `llvm/projects/llvm-spirv`"
        )
    endif()


    set(SPIRV_BASE_REVISION llvm_release_110)
    set(TARGET_BRANCH "ocl-open-110")
    get_filename_component(LLVM_MONOREPO_DIR ${LLVM_SOURCE_DIR} DIRECTORY)
    set(LLVM_PATCHES_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/patches/llvm
                          ${CMAKE_CURRENT_SOURCE_DIR}/patches/clang)
    apply_patches(${LLVM_MONOREPO_DIR}
                  "${LLVM_PATCHES_DIRS}"
                  ${LLVM_BASE_REVISION}
                  ${TARGET_BRANCH}
                  ret)
    if(${ret})
        add_definitions(-DAPPLIED_LLVM_PATCHES)
    endif()
    apply_patches(${SPIRV_SOURCE_DIR}
                  ${CMAKE_CURRENT_SOURCE_DIR}/patches/spirv
                  ${SPIRV_BASE_REVISION}
                  ${TARGET_BRANCH}
                  ret)
endif(NOT USE_PREBUILT_LLVM)

#
# TblGen the options include file
#
set (COMPILE_OPTIONS_TD  opencl_clang_options.td)
set (COMPILE_OPTIONS_INC opencl_clang_options.inc)

set(LLVM_TABLEGEN_EXE "llvm-tblgen")
set(LLVM_TARGET_DEFINITIONS ${COMPILE_OPTIONS_TD})
if(USE_PREBUILT_LLVM)
  set(TABLEGEN_ADDITIONAL -I ${LLVM_INCLUDE_DIRS})
else(USE_PREBUILT_LLVM)
  set(TABLEGEN_ADDITIONAL "")
endif(USE_PREBUILT_LLVM)
tablegen(LLVM ${COMPILE_OPTIONS_INC} -gen-opt-parser-defs ${TABLEGEN_ADDITIONAL})
add_public_tablegen_target(CClangCompileOptions)

#
# Source code
#
set(TARGET_INCLUDE_FILES
    common_clang.h
    options.h
    binary_result.h
    pch_mgr.h
    ${COMPILE_OPTIONS_TD}
    ${COMPILE_OPTIONS_INC}
)

set(TARGET_SOURCE_FILES
    common_clang.cpp
    options.cpp
    pch_mgr.cpp
    options_compile.cpp
)

#
# Resources
#

set( PRODUCT_VER_MAJOR 2 )
set( PRODUCT_VER_MINOR 0 )
set (LLVM_VER_MAJOR ${LLVM_VERSION_MAJOR} )
set (LLVM_VER_MINOR ${LLVM_VERSION_MINOR} )

add_definitions( -D__STDC_LIMIT_MACROS )
add_definitions( -D__STDC_CONSTANT_MACROS )
add_definitions( -DCOMMON_CLANG_EXPORTS )

#
# Include directories
#

if(NOT USE_PREBUILT_LLVM)
    set(CLANG_BINARY_DIR ${LLVM_BINARY_DIR}/tools/clang/)
    include_directories(
        ${CLANG_BINARY_DIR}/include  # for tablegened includes
        ${CLANG_SOURCE_DIR}/include  # for basic headers
        ${SPIRV_SOURCE_DIR}/include) # for SPIRV headers
endif(NOT USE_PREBUILT_LLVM)

if(USE_PREBUILT_LLVM AND NOT LLVMSPIRV_INCLUDED_IN_LLVM)
    include_directories(${SPIRV_TRANSLATOR_DIR}/include)
    link_directories(${SPIRV_TRANSLATOR_DIR}/lib${LLVM_LIBDIR_SUFFIX})
endif(USE_PREBUILT_LLVM AND NOT LLVMSPIRV_INCLUDED_IN_LLVM)

include_directories( AFTER
            ${LLVM_INCLUDE_DIRS}
            ${CMAKE_CURRENT_BINARY_DIR}
            ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}
            )

link_directories(
    ${LLVM_LIBRARY_DIRS}
)

set(OPENCL_CLANG_LINK_LIBS ${CMAKE_DL_LIBS})

if(NOT LLVMSPIRVLib IN_LIST LLVM_AVAILABLE_LIBS OR (USE_PREBUILT_LLVM AND LLVM_LINK_LLVM_DYLIB))
  # SPIRV-LLVM-Translator is not included into LLVM as a component.
  # So, we need to list it here explicitly as an external library
  list(APPEND OPENCL_CLANG_LINK_LIBS LLVMSPIRVLib)
endif()

add_subdirectory(cl_headers)

set(LLVM_REQUIRES_EH ON)

if(USE_PREBUILT_LLVM OR CLANG_LINK_CLANG_DYLIB)
  list(APPEND OPENCL_CLANG_LINK_LIBS clang-cpp)
else()
  list(APPEND OPENCL_CLANG_LINK_LIBS
# The list of clang libraries is taken from clang makefile
# (build/tools/clang/tools/driver/CMakeFiles/clang.dir/link.txt)
# All duplicate libraries are there on purpose
    clangBasic
    clangCodeGen
    clangDriver
    clangFrontend
    clangFrontendTool
    clangCodeGen
    clangRewriteFrontend
    clangARCMigrate
    clangStaticAnalyzerFrontend
    clangStaticAnalyzerCheckers
    clangStaticAnalyzerCore
    clangCrossTU
    clangIndex
    clangFrontend
    clangDriver
    clangParse
    clangSerialization
    clangSema
    clangAnalysis
    clangEdit
    clangFormat
    clangToolingInclusions
    clangToolingCore
    clangRewrite
    clangASTMatchers
    clangAST
    clangLex
    clangBasic
  )
endif()

add_llvm_library(${TARGET_NAME} SHARED
  ${TARGET_INCLUDE_FILES}
  ${TARGET_SOURCE_FILES}
  $<TARGET_OBJECTS:cl_headers>

  DEPENDS CClangCompileOptions
  LINK_COMPONENTS
    all
  LINK_LIBS
    ${OPENCL_CLANG_LINK_LIBS}
  )

# Configure resource file on Windows
if (WIN32)
    # windows_resource_file should be defined by llvm_add_library and should
    # contain full patch to a .rc file
    # It also might not be defined if this library is built out-of-tree:
    # let's use our copy of .rc file from LLVM source tree in that case
    if (NOT DEFINED windows_resource_file)
        set(windows_resource_file windows_resource_file.rc)
    endif(NOT DEFINED windows_resource_file)

    set(RC_CHAR_TM "\\231")
    set(RC_CHAR_C "\\251")
    set(RC_CHAR_R "\\256")

    set(RC_FILE_VERSION "${PRODUCT_VER_MAJOR}.${PRODUCT_VER_MINOR}.${LLVM_VER_MAJOR}.${LLVM_VER_MINOR}")
    set(RC_PRODUCT_NAME "Intel${RC_CHAR_R} Front-end Library for OpenCL${RC_CHAR_TM} software")

    # Adjust content of the resource file by specifying compile definitions
    set_property(SOURCE ${windows_resource_file}
        PROPERTY COMPILE_DEFINITIONS
            "RC_VERSION_FIELD_1=${PRODUCT_VER_MAJOR}"
            "RC_VERSION_FIELD_2=${PRODUCT_VER_MINOR}"
            "RC_VERSION_FIELD_3=${LLVM_VER_MAJOR}"
            "RC_VERSION_FIELD_4=${LLVM_VER_MINOR}"
            "RC_COMPANY_NAME=\"Intel Corporation\""
            "RC_FILE_DESCRIPTION=\"${RC_PRODUCT_NAME}\""
            "RC_FILE_VERSION=\"${RC_FILE_VERSION}\""
            "RC_INTERNAL_NAME=\"${TARGET_NAME}\""
            "RC_ORIGINAL_FILENAME=\"${TARGET_NAME}.dll\""
            "RC_PRODUCT_NAME=\"${RC_PRODUCT_NAME}\""
            "RC_PRODUCT_VERSION=\"${RC_FILE_VERSION}\""
            "RC_COPYRIGHT=\"Copyright ${RC_CHAR_C} 2018 Intel Corporation. All rights reserved.\"")

    # Enable compiler generation of Control Flow Guard security checks.
    target_compile_options(${TARGET_NAME} PUBLIC "/guard:cf")
    set_property(TARGET ${TARGET_NAME} APPEND_STRING PROPERTY
        LINK_FLAGS "/DYNAMICBASE /GUARD:CF")

elseif(UNIX)
    set_property(TARGET ${TARGET_NAME} APPEND_STRING PROPERTY
        COMPILE_DEFINITIONS LIBCOMMON_CLANG_NAME="$<TARGET_SONAME_FILE_NAME:${TARGET_NAME}>")

    set_property(TARGET ${TARGET_NAME} APPEND_STRING PROPERTY
        LINK_FLAGS " -Wl,--no-undefined")
endif(WIN32)

install(FILES common_clang.h
        DESTINATION include/cclang
        COMPONENT ${TARGET_NAME})

SET_LINUX_EXPORTS_FILE( ${TARGET_NAME} common_clang.map )

add_custom_target(deploy DEPENDS install-${TARGET_NAME})