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

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

# LLVM project lib folder
if (ENV{LLVM_PROJECT_LIB})
  set(LLVM_PROJECT_LIB $ENV{LLVM_PROJECT_LIB})
else()
  if(MSVC)
    if (CMAKE_BUILD_TYPE)
      set(LLVM_PROJECT_LIB ${LLVM_PROJ_BUILD}/${CMAKE_BUILD_TYPE}/lib)
    else()
      set(LLVM_PROJECT_LIB ${LLVM_PROJ_BUILD}/release/lib)
    endif()  
  else()
    set(LLVM_PROJECT_LIB ${LLVM_PROJ_BUILD}/lib)
  endif()
endif()
message(STATUS "LLVM_PROJECT_LIB:" ${LLVM_PROJECT_LIB})

# LLVM project bin folder
if (ENV{LLVM_PROJ_BIN})
  set(LLVM_PROJ_BIN $ENV{LLVM_PROJ_BIN})
else()
  if(MSVC)
    if (CMAKE_BUILD_TYPE)
      set(LLVM_PROJ_BIN ${LLVM_PROJ_BUILD}/${CMAKE_BUILD_TYPE}/bin)
    else()
      set(LLVM_PROJ_BIN ${LLVM_PROJ_BUILD}/Release/bin)
    endif()
  else()
    set(LLVM_PROJ_BIN ${LLVM_PROJ_BUILD}/bin)
  endif()
endif()
message(STATUS "LLVM_PROJ_BIN:" ${LLVM_PROJ_BIN})

# Include paths for MLIR
set(LLVM_SRC_INCLUDE_PATH ${LLVM_PROJ_SRC}/llvm/include)
set(LLVM_BIN_INCLUDE_PATH ${LLVM_PROJ_BUILD}/include)
set(MLIR_SRC_INCLUDE_PATH ${LLVM_PROJ_SRC}/mlir/include)
set(MLIR_BIN_INCLUDE_PATH ${LLVM_PROJ_BUILD}/tools/mlir/include)
set(MLIR_TOOLS_DIR ${LLVM_PROJ_BIN})

# ONNX-MLIR tools folder
if(MSVC)
  if (CMAKE_BUILD_TYPE)
    set(ONNX_MLIR_TOOLS_DIR ${CMAKE_BINARY_DIR}/bin/${CMAKE_BUILD_TYPE})
  else()
    set(ONNX_MLIR_TOOLS_DIR ${CMAKE_BINARY_DIR}/bin/Release)
  endif()
else()
  set(ONNX_MLIR_TOOLS_DIR ${CMAKE_BINARY_DIR}/bin)
endif()
message(STATUS "ONNX_MLIR_TOOLS_DIR:" ${ONNX_MLIR_TOOLS_DIR})
set(ONNX_MLIR_LIT_TEST_SRC_DIR ${ONNX_MLIR_SRC_ROOT}/test/mlir)
set(ONNX_MLIR_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})

# Force BUILD_SHARED_LIBS to be the same as LLVM build
file(STRINGS ${LLVM_PROJ_BUILD}/CMakeCache.txt shared REGEX BUILD_SHARED_LIBS)
string(REGEX REPLACE "BUILD_SHARED_LIBS:BOOL=" "" shared ${shared})
set(BUILD_SHARED_LIBS ${shared} CACHE BOOL "" FORCE)
message(STATUS "BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS}")

# Threading libraries required due to parallel pass execution.
find_package(Threads REQUIRED)
# libcurses and libz required by libLLVMSupport
if(MSVC)
  if(DEFINED ENV{CURSES_LIB_PATH})
    find_library(CURSES_LIBRARIES
            NAMES pdcurses
            PATHS $ENV{CURSES_LIB_PATH}
            NO_DEFAULT_PATH)
    if(CURSES_LIBRARIES)
      message(STATUS "CURSES_LIBRARIES: ${CURSES_LIBRARIES}")
    else()
      message(FATAL_ERROR "Could not find curses library at $ENV{CURSES_LIB_PATH}")
    endif()
  else()
      message(FATAL_ERROR "Expected CURSES_LIB_PATH environment variable to be set to location of pdcurses.lib")
  endif()
else()
  find_package(Curses REQUIRED)
  find_package(ZLIB REQUIRED)
endif()

# Set output library path
if(MSVC)
  if (CMAKE_BUILD_TYPE)
    set(ONNX_MLIR_LIB_DIR ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${CMAKE_BUILD_TYPE})
  else()
    set(ONNX_MLIR_LIB_DIR ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/Release)
  endif()
else()
    set(ONNX_MLIR_LIB_DIR ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
endif()

function(find_mlir_lib lib)
  find_library(${lib}
          NAMES ${lib}
          PATHS ${LLVM_PROJECT_LIB}
          NO_DEFAULT_PATH)
  if(${${lib}} STREQUAL ${lib}-NOTFOUND)
    message(FATAL_ERROR "${lib} not found, did you forget to build llvm-project?")
  endif()
endfunction(find_mlir_lib)

find_mlir_lib(MLIRAffineOps)
find_mlir_lib(MLIRAffineUtils)
find_mlir_lib(MLIRAffineToStandard)
find_mlir_lib(MLIRAffineTransforms)
find_mlir_lib(MLIRAnalysis)
find_mlir_lib(MLIRCallInterfaces)
find_mlir_lib(MLIRControlFlowInterfaces)
find_mlir_lib(MLIRCopyOpInterface)
find_mlir_lib(MLIRDialect)
find_mlir_lib(MLIREDSC)
find_mlir_lib(MLIRExecutionEngine)
find_mlir_lib(MLIRInferTypeOpInterface)
find_mlir_lib(MLIRIR)
find_mlir_lib(MLIRLLVMIR)
find_mlir_lib(MLIRLoopAnalysis)
find_mlir_lib(MLIRSCFToStandard)
find_mlir_lib(MLIRLoopLikeInterface)
find_mlir_lib(MLIRLinalgOps)
find_mlir_lib(MLIRLinalgEDSC)
find_mlir_lib(MLIRLinalgAnalysis)
find_mlir_lib(MLIRLinalgTransforms)
find_mlir_lib(MLIRLinalgUtils)
find_mlir_lib(MLIRSCF)
find_mlir_lib(MLIRSCFTransforms)
find_mlir_lib(MLIRLLVMIRTransforms)
find_mlir_lib(MLIRMlirOptMain)
find_mlir_lib(MLIRParser)
find_mlir_lib(MLIRPass)
find_mlir_lib(MLIRStandardOps)
find_mlir_lib(MLIRStandardOpsTransforms)
find_mlir_lib(MLIRStandardToLLVM)
find_mlir_lib(MLIRSideEffectInterfaces)
find_mlir_lib(MLIRTargetLLVMIR)
find_mlir_lib(MLIRTransforms)
find_mlir_lib(MLIRTransformUtils)
find_mlir_lib(MLIRSupport)
find_mlir_lib(MLIRShape)
find_mlir_lib(MLIRShapeToStandard)
find_mlir_lib(MLIRSideEffectInterfaces)
find_mlir_lib(MLIROpenMP)
find_mlir_lib(MLIROptLib)
find_mlir_lib(MLIRTableGen)
find_mlir_lib(MLIRTargetLLVMIRModuleTranslation)
find_mlir_lib(MLIRTargetLLVMIR)
find_mlir_lib(MLIRTransformUtils)
find_mlir_lib(MLIRTranslation)
find_mlir_lib(MLIRVector)
find_mlir_lib(MLIRVectorInterfaces)
find_mlir_lib(MLIRVectorToLLVM)
find_mlir_lib(MLIRVectorToSCF)
find_mlir_lib(MLIRMlirOptMain)
find_mlir_lib(MLIRAffineEDSC)
find_mlir_lib(MLIRLinalgEDSC)
find_mlir_lib(MLIRViewLikeInterface)
find_mlir_lib(MLIRPresburger)

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)
find_mlir_lib(LLVMFrontendOpenMP)

set(MLIRLibs
        ${MLIRAffineToStandard}
        ${MLIRAffineOps}
        ${MLIRAffineUtils}
        ${MLIRCopyOpInterface}
        ${MLIRLLVMIR}
        ${MLIRStandardOps}
        ${MLIRStandardOpsTransforms}
        ${MLIRStandardToLLVM}
        ${MLIRTransforms}
        ${MLIRSCFToStandard}
        ${MLIRVector}
        ${MLIRVectorInterfaces}
        ${MLIRVectorToLLVM}
        ${MLIRVectorToSCF}
        ${MLIRSCF}
        ${MLIRIR}
        ${MLIRLLVMIR}
        ${MLIROptLib}
        ${MLIRParser}
        ${MLIRPass}
        ${MLIRTargetLLVMIR}
        ${MLIRTargetLLVMIRModuleTranslation}
        ${MLIRTransforms}
        ${MLIRTransformUtils}
        ${MLIRAffineOps}
        ${MLIRAffineToStandard}
        ${MLIRAffineTransforms}
        ${MLIRAnalysis}
        ${MLIRCallInterfaces}
        ${MLIRControlFlowInterfaces}
        ${MLIRDialect}
        ${MLIREDSC}
        ${MLIRExecutionEngine}
        ${MLIRIR}
        ${MLIRLLVMIRTransforms}        
        ${MLIRSCFToStandard}
        ${MLIRSCF}
        ${MLIRSCFTransforms}
        ${MLIRLoopAnalysis}
        ${MLIRLoopLikeInterface}
        ${MLIROpenMP}
        ${MLIRMlirOptMain}
        ${MLIRSideEffectInterfaces}
        ${MLIRStandardOps}
        ${MLIRStandardToLLVM}
        ${MLIRTranslation}
        ${MLIRSupport}
        ${MLIRLinalgOps}
        ${MLIRLinalgEDSC}
        ${MLIRLinalgAnalysis}
        ${MLIRLinalgTransforms}
        ${MLIRLinalgUtils}
        ${MLIRAffineEDSC}
        ${MLIRLinalgEDSC}
        ${MLIRViewLikeInterface}
        ${MLIRPresburger}
        ${MLIRShape}
        ${MLIRShapeToStandard}
        ${MLIRInferTypeOpInterface}
        # strict order verified
        ${LLVMBitWriter}
        ${LLVMObject}
        ${LLVMBitReader}
        # strict order verified
        ${LLVMFrontendOpenMP}
        ${LLVMTransformUtils}
        ${LLVMAnalysis}
        # strict order verified
        ${LLVMAsmParser}
        ${LLVMCore}
        # strict order not yet verified
        ${LLVMRemarks}
        ${LLVMMCParser}
        ${LLVMMC}
        ${LLVMProfileData}
        ${LLVMBinaryFormat}
        ${LLVMBitstreamReader}
        ${LLVMIRReader}
        ${LLVMMLIRTableGen}
        ${LLVMSupport}
        ${LLVMDemangle}
        ${CMAKE_THREAD_LIBS_INIT}
	      ${CURSES_LIBRARIES}
	      ${ZLIB_LIBRARIES})

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

function(onnx_mlir_tablegen ofn)
  tablegen(MLIR
          ${ARGV}
          "-I${MLIR_SRC_INCLUDE_PATH}"
          "-I${MLIR_BIN_INCLUDE_PATH}"
          "-I${ONNX_MLIR_SRC_ROOT}")
  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)
# Specify extension for incremental Windows builds.
if(MSVC)
  set_property(TARGET mlir-tblgen
          PROPERTY IMPORTED_LOCATION ${LLVM_PROJ_BIN}/mlir-tblgen.exe)
else()
  set_property(TARGET mlir-tblgen
          PROPERTY IMPORTED_LOCATION ${LLVM_PROJ_BIN}/mlir-tblgen)
endif()

set(MLIR_TABLEGEN_EXE mlir-tblgen)

# Add a dialect used by ONNX MLIR and copy the generated operation
# documentation to the desired places.
# c.f. https://github.com/llvm/llvm-project/blob/e298e216501abf38b44e690d2b28fc788ffc96cf/mlir/CMakeLists.txt#L11
function(add_onnx_mlir_dialect_doc dialect dialect_tablegen_file)
  # Generate Dialect Documentation
  set(LLVM_TARGET_DEFINITIONS ${dialect_tablegen_file})
  onnx_mlir_tablegen(${dialect}.md -gen-op-doc)
  set(GEN_DOC_FILE ${ONNX_MLIR_BIN_ROOT}/docs/Dialects/${dialect}.md)
  add_custom_command(
          OUTPUT ${GEN_DOC_FILE}
          COMMAND ${CMAKE_COMMAND} -E copy
          ${CMAKE_CURRENT_BINARY_DIR}/${dialect}.md
          ${GEN_DOC_FILE}
          DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${dialect}.md)
  add_custom_target(${dialect}DocGen DEPENDS ${GEN_DOC_FILE})
  add_dependencies(onnx-mlir-doc ${dialect}DocGen)
endfunction()

add_custom_target(onnx-mlir-doc)