include(LLVMProcessSources)

function(get_system_libs return_var)
  # Returns in `return_var' a list of system libraries used by LLVM.
  if( NOT MSVC )
    if( MINGW )
      set(system_libs ${system_libs} imagehlp psapi)
    elseif( CMAKE_HOST_UNIX )
      if( HAVE_LIBDL )
        set(system_libs ${system_libs} ${CMAKE_DL_LIBS})
      endif()
      if( LLVM_ENABLE_THREADS AND HAVE_LIBPTHREAD )
        set(system_libs ${system_libs} pthread)
      endif()
    endif( MINGW )
  endif( NOT MSVC )
  set(${return_var} ${system_libs} PARENT_SCOPE)
endfunction(get_system_libs)

macro(add_llvm_library name)
  llvm_process_sources( ALL_FILES ${ARGN} )
  add_library( ${name} ${ALL_FILES} )
  set( llvm_libs ${llvm_libs} ${name} PARENT_SCOPE)
  set( llvm_lib_targets ${llvm_lib_targets} ${name} PARENT_SCOPE )
  if( LLVM_COMMON_DEPENDS )
    add_dependencies( ${name} ${LLVM_COMMON_DEPENDS} )
  endif( LLVM_COMMON_DEPENDS )
  if (LLVM_COMMON_LIBS)
    target_link_libraries(${name} ${LLVM_COMMON_LIBS})
  endif()
  install(TARGETS ${name}
    EXPORT LLVM
    LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
    ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
  # The LLVM Target library shall be built before its sublibraries
  # (asmprinter, etc) because those may use tablegenned files which
  # generation is triggered by the main LLVM target library. Necessary
  # for parallel builds:
  if( CURRENT_LLVM_TARGET )
    add_dependencies(${name} ${CURRENT_LLVM_TARGET})
  endif()
endmacro(add_llvm_library name)


macro(add_llvm_loadable_module name)
  if( NOT LLVM_ON_UNIX )
    message(STATUS "Loadable modules not supported on this platform.
${name} ignored.")
  else()
    llvm_process_sources( ALL_FILES ${ARGN} )
    add_library( ${name} MODULE ${ALL_FILES} )
    set_target_properties( ${name} PROPERTIES PREFIX "" )

    if (APPLE)
      # Darwin-specific linker flags for loadable modules.
      set_target_properties(${name} PROPERTIES
        LINK_FLAGS "-Wl,-flat_namespace -Wl,-undefined -Wl,suppress")
    endif()

    install(TARGETS ${name}
      EXPORT LLVM
      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
  endif()
endmacro(add_llvm_loadable_module name)


macro(add_llvm_executable name)
  llvm_process_sources( ALL_FILES ${ARGN} )
  if( EXCLUDE_FROM_ALL )
    add_executable(${name} EXCLUDE_FROM_ALL ${ALL_FILES})
  else()
    add_executable(${name} ${ALL_FILES})
  endif()
  set(EXCLUDE_FROM_ALL OFF)
  if( LLVM_USED_LIBS )
    foreach(lib ${LLVM_USED_LIBS})
      target_link_libraries( ${name} ${lib} )
    endforeach(lib)
  endif( LLVM_USED_LIBS )
  if( LLVM_COMMON_DEPENDS )
    add_dependencies( ${name} ${LLVM_COMMON_DEPENDS} )
  endif( LLVM_COMMON_DEPENDS )
  if (LLVM_COMMON_LIBS)
    target_link_libraries(${name} ${LLVM_COMMON_LIBS})
  endif()
  if( NOT MINGW )
    get_system_libs(llvm_system_libs)
    if( llvm_system_libs )
      target_link_libraries(${name} ${llvm_system_libs})
    endif()
  endif()
endmacro(add_llvm_executable name)


macro(add_llvm_tool name)
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LLVM_TOOLS_BINARY_DIR})
  if( NOT LLVM_BUILD_TOOLS )
    set(EXCLUDE_FROM_ALL ON)
  endif()
  add_llvm_executable(${name} ${ARGN})
  if( LLVM_BUILD_TOOLS )
    install(TARGETS ${name} RUNTIME DESTINATION bin)
  endif()
endmacro(add_llvm_tool name)


macro(add_llvm_example name)
#  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LLVM_EXAMPLES_BINARY_DIR})
  if( NOT LLVM_BUILD_EXAMPLES )
    set(EXCLUDE_FROM_ALL ON)
  endif()
  add_llvm_executable(${name} ${ARGN})
  if( LLVM_BUILD_EXAMPLES )
    install(TARGETS ${name} RUNTIME DESTINATION examples)
  endif()
endmacro(add_llvm_example name)


macro(add_llvm_target target_name)
  if( TABLEGEN_OUTPUT )
    add_custom_target(${target_name}Table_gen
      DEPENDS ${TABLEGEN_OUTPUT})
    add_dependencies(${target_name}Table_gen ${LLVM_COMMON_DEPENDS})
  endif( TABLEGEN_OUTPUT )
  include_directories(BEFORE ${CMAKE_CURRENT_BINARY_DIR})
  add_llvm_library(LLVM${target_name} ${ARGN} ${TABLEGEN_OUTPUT})
  if ( TABLEGEN_OUTPUT )
    add_dependencies(LLVM${target_name} ${target_name}Table_gen)
  endif (TABLEGEN_OUTPUT)
  set(CURRENT_LLVM_TARGET LLVM${target_name} PARENT_SCOPE)
endmacro(add_llvm_target)

macro(llvm_get_target_libraries return_var)
  set( link_components ${ARGN} )
  foreach(c ${link_components})
    # add codegen, asmprinter, asmparser, disassembler
    list(FIND LLVM_TARGETS_TO_BUILD ${c} idx)
    if( NOT idx LESS 0 )
      list(FIND llvm_libs "LLVM${c}CodeGen" idx)
      if( NOT idx LESS 0 )
        list(APPEND expanded_components "LLVM${c}CodeGen")
      else()
        list(FIND llvm_libs "LLVM${c}" idx)
        if( NOT idx LESS 0 )
          list(APPEND expanded_components "LLVM${c}")
        else()
          message(FATAL_ERROR "Target ${c} is not in the set of libraries.")
        endif()
      endif()
      list(FIND llvm_libs "LLVM${c}AsmPrinter" asmidx)
      if( NOT asmidx LESS 0 )
        list(APPEND expanded_components "LLVM${c}AsmPrinter")
      endif()
      list(FIND llvm_libs "LLVM${c}AsmParser" asmidx)
      if( NOT asmidx LESS 0 )
        list(APPEND expanded_components "LLVM${c}AsmParser")
      endif()
      list(FIND llvm_libs "LLVM${c}Info" asmidx)
      if( NOT asmidx LESS 0 )
        list(APPEND expanded_components "LLVM${c}Info")
      endif()
      list(FIND llvm_libs "LLVM${c}Disassembler" asmidx)
      if( NOT asmidx LESS 0 )
        list(APPEND expanded_components "LLVM${c}Disassembler")
      endif()
    elseif( c STREQUAL "native" )
      list(APPEND expanded_components "LLVM${LLVM_NATIVE_ARCH}CodeGen")
    elseif( c STREQUAL "nativecodegen" )
      list(APPEND expanded_components "LLVM${LLVM_NATIVE_ARCH}CodeGen")
    elseif( c STREQUAL "backend" )
      # same case as in `native'.
    elseif( c STREQUAL "engine" OR c STREQUAL "jit")
      # TODO: as we assume we are on X86, this is `jit'.
      list(APPEND expanded_components "LLVMJIT")
    elseif( c STREQUAL "interpreter" )
      list(APPEND expanded_components "LLVMInterpreter")
    elseif( c STREQUAL "all" )
      list(APPEND expanded_components ${llvm_libs})
    else( NOT idx LESS 0 )
      list(APPEND expanded_components LLVM${c})
    endif( NOT idx LESS 0 )
  endforeach(c)
  set(${return_var} ${expanded_components})
endmacro(llvm_get_target_libraries)

macro(add_llvm_link_components target_name)
  llvm_get_target_libraries(target_libs ${ARGN})
  target_link_libraries(${target_name} ${target_libs})
endmacro()