include(AddLLVM)
include(ExternalProject)
include(CompilerRTUtils)

# Tries to add an "object library" target for a given list of OSs and/or
# architectures with name "<name>.<arch>" for non-Darwin platforms if
# architecture can be targeted, and "<name>.<os>" for Darwin platforms.
# add_compiler_rt_object_libraries(<name>
#                                  OS <os names>
#                                  ARCHS <architectures>
#                                  SOURCES <source files>
#                                  CFLAGS <compile flags>
#                                  DEFS <compile definitions>)
function(add_compiler_rt_object_libraries name)
  cmake_parse_arguments(LIB "" "" "OS;ARCHS;SOURCES;CFLAGS;DEFS" ${ARGN})
  set(libnames)
  if(APPLE)
    foreach(os ${LIB_OS})
      set(libname "${name}.${os}")
      set(libnames ${libnames} ${libname})
      set(extra_cflags_${libname} ${DARWIN_${os}_CFLAGS})
      list_intersect(LIB_ARCHS_${libname} DARWIN_${os}_ARCHS LIB_ARCHS)
    endforeach()
  else()
    foreach(arch ${LIB_ARCHS})
      set(libname "${name}.${arch}")
      set(libnames ${libnames} ${libname})
      set(extra_cflags_${libname} ${TARGET_${arch}_CFLAGS})
      if(NOT CAN_TARGET_${arch})
        message(FATAL_ERROR "Architecture ${arch} can't be targeted")
        return()
      endif()
    endforeach()
  endif()
  
  foreach(libname ${libnames})
    add_library(${libname} OBJECT ${LIB_SOURCES})
    set_target_compile_flags(${libname}
      ${CMAKE_CXX_FLAGS} ${extra_cflags_${libname}} ${LIB_CFLAGS})
    set_property(TARGET ${libname} APPEND PROPERTY
      COMPILE_DEFINITIONS ${LIB_DEFS})
    if(APPLE)
      set_target_properties(${libname} PROPERTIES
        OSX_ARCHITECTURES "${LIB_ARCHS_${libname}}")
    endif()
  endforeach()
endfunction()

# Takes a list of object library targets, and a suffix and appends the proper
# TARGET_OBJECTS string to the output variable.
# format_object_libs(<output> <suffix> ...)
macro(format_object_libs output suffix)
  foreach(lib ${ARGN})
    list(APPEND ${output} $<TARGET_OBJECTS:${lib}.${suffix}>)
  endforeach()
endmacro()

# Adds static or shared runtime for a list of architectures and operating
# systems and puts it in the proper directory in the build and install trees.
# add_compiler_rt_runtime(<name>
#                         {STATIC|SHARED}
#                         ARCHS <architectures>
#                         OS <os list>
#                         SOURCES <source files>
#                         CFLAGS <compile flags>
#                         LINKFLAGS <linker flags>
#                         DEFS <compile definitions>
#                         LINK_LIBS <linked libraries> (only for shared library)
#                         OBJECT_LIBS <object libraries to use as sources>
#                         PARENT_TARGET <convenience parent target>)
function(add_compiler_rt_runtime name type)
  if(NOT type MATCHES "^(STATIC|SHARED)$")
    message(FATAL_ERROR "type argument must be STATIC or SHARED")
    return()
  endif()
  cmake_parse_arguments(LIB
    ""
    "PARENT_TARGET"
    "OS;ARCHS;SOURCES;CFLAGS;LINKFLAGS;DEFS;LINK_LIBS;OBJECT_LIBS"
    ${ARGN})
  set(libnames)
  if(APPLE)
    foreach(os ${LIB_OS})
      if(type STREQUAL "STATIC")
        set(libname "${name}_${os}")
      else()
        set(libname "${name}_${os}_dynamic")
        set(extra_linkflags_${libname} ${DARWIN_${os}_LINKFLAGS} ${LIB_LINKFLAGS})
      endif()
      list_intersect(LIB_ARCHS_${libname} DARWIN_${os}_ARCHS LIB_ARCHS)
      if(LIB_ARCHS_${libname})
        list(APPEND libnames ${libname})
        set(extra_cflags_${libname} ${DARWIN_${os}_CFLAGS} ${LIB_CFLAGS})
        set(output_name_${libname} ${libname}${COMPILER_RT_OS_SUFFIX})
        set(sources_${libname} ${LIB_SOURCES})
        format_object_libs(sources_${libname} ${os} ${LIB_OBJECT_LIBS})
      endif()
    endforeach()
  else()
    foreach(arch ${LIB_ARCHS})
      if(NOT CAN_TARGET_${arch})
        message(FATAL_ERROR "Architecture ${arch} can't be targeted")
        return()
      endif()
      if(type STREQUAL "STATIC")
        set(libname "${name}-${arch}")
        set(output_name_${libname} ${libname}${COMPILER_RT_OS_SUFFIX})
      else()
        set(libname "${name}-dynamic-${arch}")
        set(extra_linkflags_${libname} ${TARGET_${arch}_CFLAGS} ${LIB_CFLAGS} ${LIB_LINKFLAGS})
        if(WIN32)
          set(output_name_${libname} ${name}_dynamic-${arch}${COMPILER_RT_OS_SUFFIX})
        else()
          set(output_name_${libname} ${name}-${arch}${COMPILER_RT_OS_SUFFIX})
        endif()
      endif()
      set(sources_${libname} ${LIB_SOURCES})
      format_object_libs(sources_${libname} ${arch} ${LIB_OBJECT_LIBS})
      set(libnames ${libnames} ${libname})
      set(extra_cflags_${libname} ${TARGET_${arch}_CFLAGS} ${LIB_CFLAGS})
    endforeach()
  endif()

  if(NOT libnames)
    return()
  endif()

  if(LIB_PARENT_TARGET)
    set(COMPONENT_OPTION COMPONENT ${LIB_PARENT_TARGET})
  endif()

  foreach(libname ${libnames})
    add_library(${libname} ${type} ${sources_${libname}})
    set_target_compile_flags(${libname} ${extra_cflags_${libname}})
    set_target_link_flags(${libname} ${extra_linkflags_${libname}})
    set_property(TARGET ${libname} APPEND PROPERTY 
                COMPILE_DEFINITIONS ${LIB_DEFS})
    set_target_properties(${libname} PROPERTIES
        ARCHIVE_OUTPUT_DIRECTORY ${COMPILER_RT_LIBRARY_OUTPUT_DIR}
        LIBRARY_OUTPUT_DIRECTORY ${COMPILER_RT_LIBRARY_OUTPUT_DIR}
        RUNTIME_OUTPUT_DIRECTORY ${COMPILER_RT_LIBRARY_OUTPUT_DIR})
    set_target_properties(${libname} PROPERTIES
        OUTPUT_NAME ${output_name_${libname}})
    if(LIB_LINK_LIBS AND ${type} STREQUAL "SHARED")
      target_link_libraries(${libname} ${LIB_LINK_LIBS})
    endif()
    install(TARGETS ${libname}
      ARCHIVE DESTINATION ${COMPILER_RT_LIBRARY_INSTALL_DIR}
              ${COMPONENT_OPTION}
      LIBRARY DESTINATION ${COMPILER_RT_LIBRARY_INSTALL_DIR}
              ${COMPONENT_OPTION}
      RUNTIME DESTINATION ${COMPILER_RT_LIBRARY_INSTALL_DIR}
              ${COMPONENT_OPTION})
    if(APPLE)
      set_target_properties(${libname} PROPERTIES
      OSX_ARCHITECTURES "${LIB_ARCHS_${libname}}")
    endif()

    if(type STREQUAL "SHARED")
      rt_externalize_debuginfo(${libname})
    endif()
  endforeach()
  if(LIB_PARENT_TARGET)
    add_dependencies(${LIB_PARENT_TARGET} ${libnames})
  endif()
endfunction()

set(COMPILER_RT_TEST_CFLAGS)

# Unittests support.
set(COMPILER_RT_GTEST_PATH ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest)
set(COMPILER_RT_GTEST_SOURCE ${COMPILER_RT_GTEST_PATH}/src/gtest-all.cc)
set(COMPILER_RT_GTEST_CFLAGS
  -DGTEST_NO_LLVM_RAW_OSTREAM=1
  -DGTEST_HAS_RTTI=0
  -I${COMPILER_RT_GTEST_PATH}/include
  -I${COMPILER_RT_GTEST_PATH}
)

append_list_if(COMPILER_RT_DEBUG -DSANITIZER_DEBUG=1 COMPILER_RT_TEST_CFLAGS)

if(MSVC)
  # clang doesn't support exceptions on Windows yet.
  list(APPEND COMPILER_RT_TEST_CFLAGS -D_HAS_EXCEPTIONS=0)

  # We should teach clang to understand "#pragma intrinsic", see PR19898.
  list(APPEND COMPILER_RT_TEST_CFLAGS -Wno-undefined-inline)

  # Clang doesn't support SEH on Windows yet.
  list(APPEND COMPILER_RT_GTEST_CFLAGS -DGTEST_HAS_SEH=0)

  # gtest use a lot of stuff marked as deprecated on Windows.
  list(APPEND COMPILER_RT_GTEST_CFLAGS -Wno-deprecated-declarations)

  # Visual Studio 2012 only supports up to 8 template parameters in
  # std::tr1::tuple by default, but gtest requires 10
  if(MSVC_VERSION EQUAL 1700)
    list(APPEND COMPILER_RT_GTEST_CFLAGS -D_VARIADIC_MAX=10)
  endif()
endif()

# Link objects into a single executable with COMPILER_RT_TEST_COMPILER,
# using specified link flags. Make executable a part of provided
# test_suite.
# add_compiler_rt_test(<test_suite> <test_name>
#                      SUBDIR <subdirectory for binary>
#                      OBJECTS <object files>
#                      DEPS <deps (e.g. runtime libs)>
#                      LINK_FLAGS <link flags>)
macro(add_compiler_rt_test test_suite test_name)
  cmake_parse_arguments(TEST "" "SUBDIR" "OBJECTS;DEPS;LINK_FLAGS" "" ${ARGN})
  if(TEST_SUBDIR)
    set(output_bin "${CMAKE_CURRENT_BINARY_DIR}/${TEST_SUBDIR}/${test_name}")
  else()
    set(output_bin "${CMAKE_CURRENT_BINARY_DIR}/${test_name}")
  endif()
  if(MSVC)
    set(output_bin "${output_bin}.exe")
  endif()
  # Use host compiler in a standalone build, and just-built Clang otherwise.
  if(NOT COMPILER_RT_STANDALONE_BUILD)
    list(APPEND TEST_DEPS clang)
  endif()
  # If we're not on MSVC, include the linker flags from CMAKE but override them
  # with the provided link flags. This ensures that flags which are required to
  # link programs at all are included, but the changes needed for the test
  # trump. With MSVC we can't do that because CMake is set up to run link.exe
  # when linking, not the compiler. Here, we hack it to use the compiler
  # because we want to use -fsanitize flags.
  if(NOT MSVC)
    set(TEST_LINK_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${TEST_LINK_FLAGS}")
    separate_arguments(TEST_LINK_FLAGS)
  endif()
  add_custom_target(${test_name}
    COMMAND ${COMPILER_RT_TEST_COMPILER} ${TEST_OBJECTS}
            -o "${output_bin}"
            ${TEST_LINK_FLAGS}
    DEPENDS ${TEST_DEPS})
  # Make the test suite depend on the binary.
  add_dependencies(${test_suite} ${test_name})
endmacro()

macro(add_compiler_rt_resource_file target_name file_name)
  set(src_file "${CMAKE_CURRENT_SOURCE_DIR}/${file_name}")
  set(dst_file "${COMPILER_RT_OUTPUT_DIR}/${file_name}")
  add_custom_command(OUTPUT ${dst_file}
    DEPENDS ${src_file}
    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src_file} ${dst_file}
    COMMENT "Copying ${file_name}...")
  add_custom_target(${target_name} DEPENDS ${dst_file})
  # Install in Clang resource directory.
  install(FILES ${file_name} DESTINATION ${COMPILER_RT_INSTALL_PATH})
endmacro()

macro(add_compiler_rt_script name)
  set(dst ${COMPILER_RT_EXEC_OUTPUT_DIR}/${name})
  set(src ${CMAKE_CURRENT_SOURCE_DIR}/${name})
  add_custom_command(OUTPUT ${dst}
    DEPENDS ${src}
    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
    COMMENT "Copying ${name}...")
  add_custom_target(${name} DEPENDS ${dst})
  install(FILES ${dst}
    PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
endmacro(add_compiler_rt_script src name)

# Builds custom version of libc++ and installs it in <prefix>.
# Can be used to build sanitized versions of libc++ for running unit tests.
# add_custom_libcxx(<name> <prefix>
#                   DEPS <list of build deps>
#                   CFLAGS <list of compile flags>)
macro(add_custom_libcxx name prefix)
  if(NOT COMPILER_RT_HAS_LIBCXX_SOURCES)
    message(FATAL_ERROR "libcxx not found!")
  endif()

  cmake_parse_arguments(LIBCXX "" "" "DEPS;CFLAGS" ${ARGN})
  foreach(flag ${LIBCXX_CFLAGS})
    set(flagstr "${flagstr} ${flag}")
  endforeach()
  set(LIBCXX_CFLAGS ${flagstr})

  if(NOT COMPILER_RT_STANDALONE_BUILD)
    list(APPEND LIBCXX_DEPS clang)
  endif()

  ExternalProject_Add(${name}
    PREFIX ${prefix}
    SOURCE_DIR ${COMPILER_RT_LIBCXX_PATH}
    CMAKE_ARGS -DCMAKE_MAKE_PROGRAM:STRING=${CMAKE_MAKE_PROGRAM}
               -DCMAKE_C_COMPILER=${COMPILER_RT_TEST_COMPILER}
               -DCMAKE_CXX_COMPILER=${COMPILER_RT_TEST_CXX_COMPILER}
               -DCMAKE_C_FLAGS=${LIBCXX_CFLAGS}
               -DCMAKE_CXX_FLAGS=${LIBCXX_CFLAGS}
               -DCMAKE_BUILD_TYPE=Release
               -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
               -DLLVM_PATH=${LLVM_MAIN_SRC_DIR}
    LOG_BUILD 1
    LOG_CONFIGURE 1
    LOG_INSTALL 1
    )
  set_target_properties(${name} PROPERTIES EXCLUDE_FROM_ALL TRUE)

  ExternalProject_Add_Step(${name} force-reconfigure
    DEPENDERS configure
    ALWAYS 1
    )

  ExternalProject_Add_Step(${name} clobber
    COMMAND ${CMAKE_COMMAND} -E remove_directory <BINARY_DIR>
    COMMAND ${CMAKE_COMMAND} -E make_directory <BINARY_DIR>
    COMMENT "Clobberring ${name} build directory..."
    DEPENDERS configure
    DEPENDS ${LIBCXX_DEPS}
    )
endmacro()

function(rt_externalize_debuginfo name)
  if(NOT COMPILER_RT_EXTERNALIZE_DEBUGINFO)
    return()
  endif()

  if(APPLE)
    if(CMAKE_CXX_FLAGS MATCHES "-flto"
      OR CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE} MATCHES "-flto")

      set(lto_object ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${name}-lto.o)
      set_property(TARGET ${name} APPEND_STRING PROPERTY
        LINK_FLAGS " -Wl,-object_path_lto -Wl,${lto_object}")
    endif()
    add_custom_command(TARGET ${name} POST_BUILD
      COMMAND xcrun dsymutil $<TARGET_FILE:${name}>
      COMMAND xcrun strip -Sl $<TARGET_FILE:${name}>)
  else()
    message(FATAL_ERROR "COMPILER_RT_EXTERNALIZE_DEBUGINFO isn't implemented for non-darwin platforms!")
  endif()
endfunction()