# Path to LLVM source folder.
if(DEFINED ENV{LLVM_SRC})
  set(LLVM_SRC $ENV{LLVM_SRC})
  if(EXISTS ${LLVM_SRC})
    message(STATUS "LLVM_SRC " ${LLVM_SRC})
  else()
    message(FATAL_ERROR "The path specified by LLVM_SRC does not exist: "
            ${LLVM_SRC})
  endif()
else()
  message(FATAL_ERROR "env variable LLVM_SRC not set")
endif()

# Path to LLVM build folder
if(DEFINED ENV{LLVM_BUILD})
  set(LLVM_BUILD $ENV{LLVM_BUILD})
  if(EXISTS ${LLVM_BUILD})
    message(STATUS "LLVM_BUILD " ${LLVM_BUILD})
  else()
    message(FATAL_ERROR "The path specified by LLVM_BUILD does not exist: "
            ${LLVM_BUILD})
  endif()
else()
  message(FATAL_ERROR "env variable LLVM_BUILD not set")
endif()

# LLVM project lib folder
set(LLVM_PROJECT_LIB ${LLVM_BUILD}/lib)

# Include paths for MLIR
set(LLVM_SRC_INCLUDE_PATH ${LLVM_SRC}/include)
set(LLVM_BIN_INCLUDE_PATH ${LLVM_BUILD}/include)
set(MLIR_SRC_INCLUDE_PATH ${LLVM_SRC}/../mlir/include)
set(MLIR_BIN_INCLUDE_PATH ${LLVM_BUILD}/tools/mlir/include)
set(MLIR_TOOLS_DIR ${LLVM_BUILD}/bin)

set(ONNF_TOOLS_DIR ${ONNF_BIN_ROOT}/bin)
set(ONNF_LIT_TEST_SRC_DIR ${CMAKE_SOURCE_DIR}/test/mlir)
set(ONNF_LIT_TEST_BUILD_DIR ${CMAKE_BINARY_DIR}/test/mlir)

set(
        MLIR_INCLUDE_PATHS
        ${LLVM_SRC_INCLUDE_PATH};${LLVM_BIN_INCLUDE_PATH};${MLIR_SRC_INCLUDE_PATH};${MLIR_BIN_INCLUDE_PATH}
)
include_directories(${MLIR_INCLUDE_PATHS})

# Threading libraries required due to parallel pass execution.
find_package(Threads REQUIRED)

function(find_mlir_lib lib)
  find_library(${lib}
          NAMES ${lib}
          PATHS ${LLVM_PROJECT_LIB}
          NO_DEFAULT_PATH)
endfunction(find_mlir_lib)

find_mlir_lib(MLIRAffineOps)
find_mlir_lib(MLIRAffineToStandard)
find_mlir_lib(MLIRAnalysis)
find_mlir_lib(MLIRDialect)
find_mlir_lib(MLIRExecutionEngine)
find_mlir_lib(MLIRIR)
find_mlir_lib(MLIRLLVMIR)
find_mlir_lib(MLIRLoopToStandard)
find_mlir_lib(MLIRLoopOps)
find_mlir_lib(MLIRParser)
find_mlir_lib(MLIRPass)
find_mlir_lib(MLIRStandardOps)
find_mlir_lib(MLIRStandardToLLVM)
find_mlir_lib(MLIRTargetLLVMIR)
find_mlir_lib(MLIRTransforms)
find_mlir_lib(MLIRTransformUtils)
find_mlir_lib(MLIRSupport)
find_mlir_lib(MLIROptMain)
find_mlir_lib(MLIRTargetLLVMIRModuleTranslation)
find_mlir_lib(MLIRTargetLLVMIR)
find_mlir_lib(MLIRTransformUtils)
find_mlir_lib(MLIRTranslation)
find_mlir_lib(MLIRVectorOps)

find_mlir_lib(LLVMCore)
find_mlir_lib(LLVMSupport)
find_mlir_lib(LLVMAsmParser)
find_mlir_lib(LLVMBinaryFormat)
find_mlir_lib(LLVMRemarks)
find_mlir_lib(LLVMIRReader)
find_mlir_lib(LLVMTransformUtils)
find_mlir_lib(LLVMBitstreamReader)
find_mlir_lib(LLVMAnalysis)
find_mlir_lib(LLVMBitWriter)
find_mlir_lib(LLVMBitReader)
find_mlir_lib(LLVMMC)
find_mlir_lib(LLVMMCParser)
find_mlir_lib(LLVMObject)
find_mlir_lib(LLVMProfileData)
find_mlir_lib(LLVMDemangle)


set(MLIRLibsOnce
        ${LLVMAnalysis}
        ${LLVMAsmParser}
        ${LLVMBinaryFormat}
        ${LLVMBitReader}
        ${LLVMBitstreamReader}
        ${LLVMBitWriter}
        ${LLVMCore}
        ${LLVMIRReader}
        ${LLVMMC}
        ${LLVMMCParser}
        ${LLVMObject}
        ${LLVMRemarks}
        ${LLVMSupport}
        ${LLVMTransformUtils}
        ${LLVMProfileData}
        ${LLVMDemangle}
        ${MLIRAffineOps}
        ${MLIRAffineToStandard}
        ${MLIRAnalysis}
        ${MLIRDialect}
        ${MLIRExecutionEngine}
        ${MLIRIR}
        ${MLIRLLVMIR}
        ${MLIRLoopToStandard}
        ${MLIRLoopOps}
        ${MLIROptMain}
        ${MLIRParser}
        ${MLIRPass}
        ${MLIRStandardOps}
        ${MLIRStandardToLLVM}
        ${MLIRSupport}
        ${MLIRTargetLLVMIR}
        ${MLIRTargetLLVMIRModuleTranslation}
        ${MLIRTransforms}
        ${MLIRTransformUtils}
        ${MLIRTranslation})

set(MLIRLibs
        ${MLIRLibsOnce}
        ${MLIRLibsOnce}
        Threads::Threads)

set(MLIRWholeArchiveLibs
        MLIRAffineToStandard
        MLIRAffineOps
        MLIRLLVMIR
        MLIRStandardOps
        MLIRStandardToLLVM
        MLIRTransforms
        MLIRLoopToStandard
        MLIRVectorOps
        MLIRLoopOps)

function(whole_archive_link target lib_dir)
  get_property(link_flags TARGET ${target} PROPERTY LINK_FLAGS)
  if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
    set(link_flags "${link_flags} -L${lib_dir}  ")
    foreach(LIB ${ARGN})
      string(CONCAT link_flags ${link_flags}
              "-Wl,-force_load, ${lib_dir}/lib${LIB}.a ")
    endforeach(LIB)
  elseif(MSVC)
    foreach(LIB ${ARGN})
      string(CONCAT link_flags ${link_flags} "/WHOLEARCHIVE:${LIB} ")
    endforeach(LIB)
  else()
    set(link_flags "${link_flags} -L${lib_dir} -Wl,--whole-archive,")
    foreach(LIB ${ARGN})
      string(CONCAT link_flags ${link_flags} "-l${LIB},")
    endforeach(LIB)
    string(CONCAT link_flags ${link_flags} "--no-whole-archive")
  endif()
  set_target_properties(${target} PROPERTIES LINK_FLAGS ${link_flags})
endfunction(whole_archive_link)

function(whole_archive_link_mlir target)
  whole_archive_link(${target} ${LLVM_BUILD}/lib ${ARGN})
endfunction(whole_archive_link_mlir)

function(whole_archive_link_onnf target)
  foreach(lib_target ${ARGN})
    add_dependencies(${target} ${lib_target})
  endforeach(lib_target)
  whole_archive_link(${target} ${CMAKE_BINARY_DIR}/lib ${ARGN})
endfunction(whole_archive_link_onnf)

set(LLVM_CMAKE_DIR
        "${LLVM_BUILD}/lib/cmake/llvm"
        CACHE PATH "Path to LLVM cmake modules")
list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_DIR}")
include(AddLLVM)
include(TableGen)

function(onnf_tablegen ofn)
  tablegen(MLIR
          ${ARGV}
          "-I${MLIR_SRC_INCLUDE_PATH}"
          "-I${MLIR_BIN_INCLUDE_PATH}")
  set(TABLEGEN_OUTPUT
          ${TABLEGEN_OUTPUT} ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
          PARENT_SCOPE)
endfunction()

# Import the pre-built mlir TableGen as an imported exetuable. It is required by
# the LLVM TableGen command to have the TableGen target so that changes to the
# table gen utility itself can be detected and cause re-compilation of .td file.
add_executable(mlir-tblgen IMPORTED)
set_property(TARGET mlir-tblgen
        PROPERTY IMPORTED_LOCATION ${LLVM_BUILD}/bin/mlir-tblgen)
set(MLIR_TABLEGEN_EXE mlir-tblgen)