# The MIT License (MIT)
#
# Copyright (c)
#   2013 Matthew Arsenault
#   2015-2016 RWTH Aachen University, Federal Republic of Germany
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# Helper function to get the language of a source file.
function (sanitizer_lang_of_source FILE RETURN_VAR)
    get_filename_component(FILE_EXT "${FILE}" EXT)
    string(TOLOWER "${FILE_EXT}" FILE_EXT)
    string(SUBSTRING "${FILE_EXT}" 1 -1 FILE_EXT)

    get_property(ENABLED_LANGUAGES GLOBAL PROPERTY ENABLED_LANGUAGES)
    foreach (LANG ${ENABLED_LANGUAGES})
        list(FIND CMAKE_${LANG}_SOURCE_FILE_EXTENSIONS "${FILE_EXT}" TEMP)
        if (NOT ${TEMP} EQUAL -1)
            set(${RETURN_VAR} "${LANG}" PARENT_SCOPE)
            return()
        endif ()
    endforeach()

    set(${RETURN_VAR} "" PARENT_SCOPE)
endfunction ()


# Helper function to get compilers used by a target.
function (sanitizer_target_compilers TARGET RETURN_VAR)
    # Check if all sources for target use the same compiler. If a target uses
    # e.g. C and Fortran mixed and uses different compilers (e.g. clang and
    # gfortran) this can trigger huge problems, because different compilers may
    # use different implementations for sanitizers.
    set(BUFFER "")
    get_target_property(TSOURCES ${TARGET} SOURCES)
    foreach (FILE ${TSOURCES})
        # If expression was found, FILE is a generator-expression for an object
        # library. Object libraries will be ignored.
        string(REGEX MATCH "TARGET_OBJECTS:([^ >]+)" _file ${FILE})
        if ("${_file}" STREQUAL "")
            sanitizer_lang_of_source(${FILE} LANG)
            if (LANG)
                list(APPEND BUFFER ${CMAKE_${LANG}_COMPILER_ID})
            endif ()
        endif ()
    endforeach ()

    list(REMOVE_DUPLICATES BUFFER)
    set(${RETURN_VAR} "${BUFFER}" PARENT_SCOPE)
endfunction ()