# ******************************************************************************
# Copyright 2018-2019 Intel Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ******************************************************************************

include(ExternalProject)

find_package(ZLIB REQUIRED)

set(HALIDE_LLVM_TARBALL_URL https://releases.llvm.org/6.0.1/clang+llvm-6.0.1-x86_64-linux-gnu-ubuntu-16.04.tar.xz)
set(HALIDE_LLVM_SHA1_HASH c7db0162fbf4cc32193b6a85f84f4abee3d107b9)

ExternalProject_Add(
    ext_halide_llvm
    PREFIX halide_llvm
    URL ${HALIDE_LLVM_TARBALL_URL}
    URL_HASH SHA1=${HALIDE_LLVM_SHA1_HASH}
    CONFIGURE_COMMAND ""
    BUILD_COMMAND ""
    INSTALL_COMMAND ""
    UPDATE_COMMAND ""
    EXCLUDE_FROM_ALL TRUE
    )

ExternalProject_Get_Property(ext_halide_llvm SOURCE_DIR)

set(HALIDE_LLVM_DIR "${SOURCE_DIR}/lib/cmake/llvm")

set(HALIDE_GIT_REPO_URL https://github.com/halide/Halide)
set(HALIDE_GIT_TAG "ea9c863")

ExternalProject_Add(
    ext_halide
    PREFIX halide
    DEPENDS ext_halide_llvm
    GIT_REPOSITORY ${HALIDE_GIT_REPO_URL}
    GIT_TAG ${HALIDE_GIT_TAG}
    UPDATE_COMMAND ""
    CMAKE_GENERATOR ${CMAKE_GENERATOR}
    CMAKE_GENERATOR_PLATFORM ${CMAKE_GENERATOR_PLATFORM}
    CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
    CMAKE_ARGS
    ${NGRAPH_FORWARD_CMAKE_ARGS}
    -DLLVM_DIR=${HALIDE_LLVM_DIR}
    -DCMAKE_INSTALL_PREFIX=${EXTERNAL_PROJECTS_ROOT}/halide
    -DHALIDE_SHARED_LIBRARY=OFF
    -DWITH_APPS=OFF
    -DWITH_TUTORIALS=OFF
    -DWITH_TESTS=OFF
    -DCMAKE_POSITION_INDEPENDENT_CODE=ON
    -DTARGET_ARM=OFF
    -DTARGET_AARCH64=OFF
    -DTARGET_HEXAGON=OFF
    -DTARGET_METAL=OFF
    -DTARGET_MIPS=OFF
    -DTARGET_POWERPC=OFF
    -DTARGET_PTX=OFF
    -DTARGET_AMDGPU=OFF
    -DTARGET_OPENCL=OFF
    -DTARGET_OPENGL=OFF
    -DTARGET_OPENGLCOMPUTE=OFF
    -DTARGET_D3D12COMPUTE=OFF
    EXCLUDE_FROM_ALL TRUE
    )

# Not sure if all of these are used by Halide but we can trim it down later
# if needed
set(HALIDE_LLVM_LINK_LIBS
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMX86AsmParser${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMX86CodeGen${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMGlobalISel${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMSelectionDAG${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMAsmPrinter${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMDebugInfoCodeView${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMX86Desc${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMMCDisassembler${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMX86Info${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMX86AsmPrinter${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMX86Utils${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMMCJIT${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMLineEditor${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMInterpreter${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMExecutionEngine${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMRuntimeDyld${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMCodeGen${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMTarget${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMCoroutines${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMipo${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMInstrumentation${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMVectorize${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMScalarOpts${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMLinker${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMIRReader${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMAsmParser${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMInstCombine${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMTransformUtils${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMBitWriter${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMAnalysis${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMProfileData${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMObject${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMMCParser${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMMC${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMBitReader${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMCore${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMBinaryFormat${CMAKE_STATIC_LIBRARY_SUFFIX}
    ${SOURCE_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}LLVMSupport${CMAKE_STATIC_LIBRARY_SUFFIX}
)

add_library(libhalidellvm INTERFACE)
add_dependencies(libhalidellvm ext_halide_llvm)
target_include_directories(libhalidellvm SYSTEM INTERFACE ${EXTERNAL_PROJECTS_ROOT}/halide_llvm/include)
target_link_libraries(libhalidellvm INTERFACE ${HALIDE_LLVM_LINK_LIBS})
