# Copyright 2020 The IREE Authors
#
# Licensed under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

include(CMakeParseArguments)

# iree_check_test()
#
# Creates a test using iree-check-module for the specified source file.
#
# Mirrors the bzl rule of the same name.
#
# Parameters:
#   NAME: Name of the target
#   SRC: mlir source file to be compiled to an IREE module.
#   TARGET_BACKEND: target backend to compile for.
#   DRIVER: driver to run the module with. This can be omitted to test only
#       compilation, but consider omiting the driver as a hacky abuse of the
#       rule since compilation on its own not use iree-check-module.
#   COMPILER_FLAGS: additional flags to pass to the compiler. Bytecode output
#       format and backend flags are passed automatically.
#   RUNNER_ARGS: additional args to pass to iree-check-module. The driver
#       and input file are passed automatically.
#   LABELS: Additional labels to apply to the test. The package path and
#       "driver=${DRIVER}" are added automatically.
#   MODULE_FILE_NAME: Optional, specifies the absolute path to the filename
#       to use for the generated IREE module (.vmfb).
#   TARGET_CPU_FEATURES: If specified, a string passed as argument to
#       --iree-llvmcpu-target-cpu-features.
function(iree_check_test)
  if(NOT IREE_BUILD_TESTS)
    return()
  endif()

  # Check tests require (by way of iree_bytecode_module) some tools.
  #
  # These can either be built from source, if IREE_BUILD_COMPILER is set, or
  # be located under IREE_HOST_BIN_DIR (required if cross-compiling).
  if(NOT IREE_BUILD_COMPILER AND NOT IREE_HOST_BIN_DIR)
    return()
  endif()

  cmake_parse_arguments(
    _RULE
    ""
    "NAME;SRC;TARGET_BACKEND;DRIVER;MODULE_FILE_NAME"
    "COMPILER_FLAGS;RUNNER_ARGS;LABELS;TARGET_CPU_FEATURES;TIMEOUT"
    ${ARGN}
  )

  if(CMAKE_CROSSCOMPILING AND "hostonly" IN_LIST _RULE_LABELS)
    return()
  endif()

  iree_package_name(_PACKAGE_NAME)
  set(_NAME "${_PACKAGE_NAME}_${_RULE_NAME}")

  set(_MODULE_NAME "${_RULE_NAME}_module")

  if(DEFINED _RULE_MODULE_FILE_NAME)
    set(_MODULE_FILE_NAME "${_RULE_MODULE_FILE_NAME}")
  else(DEFINED _RULE_MODULE_FILE_NAME)
    set(_MODULE_FILE_NAME "${_MODULE_NAME}.vmfb")
  endif(DEFINED _RULE_MODULE_FILE_NAME)

  set(_BASE_COMPILER_FLAGS
    "--iree-hal-target-backends=${_RULE_TARGET_BACKEND}"
  )

  if (_RULE_TARGET_CPU_FEATURES)
    list(APPEND _BASE_COMPILER_FLAGS "--iree-llvmcpu-target-cpu-features=${_RULE_TARGET_CPU_FEATURES}")
  endif()

  iree_bytecode_module(
    NAME
      "${_MODULE_NAME}"
    MODULE_FILE_NAME
      "${_MODULE_FILE_NAME}"
    SRC
      "${_RULE_SRC}"
    FLAGS
      "${_BASE_COMPILER_FLAGS}"
      "${_RULE_COMPILER_FLAGS}"
  )

  set(_RUNNER_TARGET "iree-check-module")

  # A target specifically for the test. We could combine this with the above,
  # but we want that one to get pulled into iree_bytecode_module.
  add_custom_target("${_NAME}" ALL)
  add_dependencies(
    "${_NAME}"
    "${_NAME}_module"
    "${_RUNNER_TARGET}"
  )

  add_dependencies(iree-test-deps "${_NAME}")

  if(NOT DEFINED _RULE_DRIVER)
    return()
  endif()

  iree_native_test(
    NAME
      "${_RULE_NAME}"
    DRIVER
      "${_RULE_DRIVER}"
    SRC
      "${_RUNNER_TARGET}"
    ARGS
      "--module={{${_MODULE_FILE_NAME}}}"
      ${_RULE_RUNNER_ARGS}
    LABELS
      ${_RULE_LABELS}
    TIMEOUT
      ${_RULE_TIMEOUT}
  )
endfunction()

# iree_check_single_backend_test_suite()
#
# Creates a test suite of iree-check-module tests for a single backend/driver pair.
#
# Mirrors the bzl rule of the same name.
#
# One test is generated per source file.
# Parameters:
#   NAME: name of the generated test suite.
#   SRCS: source mlir files containing the module.
#   TARGET_BACKEND: target backend to compile for.
#   DRIVER: driver to run the module with. This can be omitted to test only
#       compilation, but consider omiting the driver as a hacky abuse of the
#       rule since compilation on its own not use iree-check-module.
#   COMPILER_FLAGS: additional flags to pass to the compiler. Bytecode output
#       format and backend flags are passed automatically.
#   RUNNER_ARGS: additional args to pass to the underlying iree-check-module
#       tests. The driver and input file are passed automatically. To use
#       different args per test, create a separate suite or iree_check_test.
#   LABELS: Additional labels to apply to the generated tests. The package path
#       is added automatically.
#   TARGET_CPU_FEATURES: If specified, a string passed as argument to
#       --iree-llvmcpu-target-cpu-features.
function(iree_check_single_backend_test_suite)
  if(NOT IREE_BUILD_TESTS)
    return()
  endif()

  # Note: we could check IREE_BUILD_COMPILER here, but cross compilation makes
  # that a little tricky. Instead, we let iree_check_test handle the checks,
  # meaning this function may run some configuration but generate no targets.

  cmake_parse_arguments(
    _RULE
    ""
    "NAME;TARGET_BACKEND;DRIVER"
    "SRCS;COMPILER_FLAGS;RUNNER_ARGS;LABELS;TARGET_CPU_FEATURES;TIMEOUT"
    ${ARGN}
  )

  string(TOUPPER "${IREE_EXTERNAL_HAL_DRIVERS}" _UPPERCASE_EXTERNAL_DRIVERS)
  string(REPLACE "-" "_" _NORMALIZED_EXTERNAL_DRIVERS "${_UPPERCASE_EXTERNAL_DRIVERS}")

  # Omit tests for which the specified driver or target backend is not enabled.
  # This overlaps with directory exclusions and other filtering mechanisms.
  #
  # Note: omitting the DRIVER arg is allowed (though it is a hack). If it is
  # omitted, we don't need to test for a driver being enabled.
  if(DEFINED _RULE_DRIVER)
    string(TOUPPER ${_RULE_DRIVER} _UPPERCASE_DRIVER)
    string(REPLACE "-" "_" _NORMALIZED_DRIVER ${_UPPERCASE_DRIVER})
    if((NOT DEFINED IREE_HAL_DRIVER_${_NORMALIZED_DRIVER}) AND (NOT ${_NORMALIZED_DRIVER} IN_LIST _NORMALIZED_EXTERNAL_DRIVERS))
      message(SEND_ERROR "Unknown driver '${_RULE_DRIVER}'. Check IREE_HAL_DRIVER_*/IREE_EXTERNAL_HAL_DRIVERS options.")
    endif()
    if((NOT IREE_HAL_DRIVER_${_NORMALIZED_DRIVER}) AND (NOT IREE_EXTERNAL_${_NORMALIZED_DRIVER}_HAL_DRIVER_FOUND))
      return()
    endif()
  endif()
  string(TOUPPER ${_RULE_TARGET_BACKEND} _UPPERCASE_TARGET_BACKEND)
  string(REPLACE "-" "_" _NORMALIZED_TARGET_BACKEND ${_UPPERCASE_TARGET_BACKEND})
  if(NOT DEFINED IREE_TARGET_BACKEND_${_NORMALIZED_TARGET_BACKEND})
    message(SEND_ERROR "Unknown backend '${_RULE_TARGET_BACKEND}'. Check IREE_TARGET_BACKEND_* options.")
  endif()
  if(IREE_HOST_BIN_DIR)
    # If we're not building the host tools from source under this configuration,
    # such as when cross compiling, then we can't easily check for which
    # compiler target backends are enabled. Just assume all are enabled and only
    # rely on the runtime HAL driver check above for filtering.

    # No driver, so this is a special configuration. The assumption above
    # might not be true, so skip (these tests are _probably_ already being
    # built on the host anyway, so no need to build when cross compiling).
    # TODO(#11354): Use a different test function / move compile to test-time
    if(NOT DEFINED _RULE_DRIVER)
      return()
    endif()
  else()
    # We are building the host tools, so check enabled compiler target backends.
    if(NOT IREE_TARGET_BACKEND_${_NORMALIZED_TARGET_BACKEND})
      return()
    endif()
  endif()

  foreach(_SRC IN LISTS _RULE_SRCS)
    get_filename_component(_BASE_NAME ${_SRC} NAME)
    set(_TEST_NAME "${_RULE_NAME}_${_BASE_NAME}")
    iree_check_test(
      NAME
        ${_TEST_NAME}
      SRC
        ${_SRC}
      TARGET_BACKEND
        ${_RULE_TARGET_BACKEND}
      DRIVER
        ${_RULE_DRIVER}
      COMPILER_FLAGS
        ${_RULE_COMPILER_FLAGS}
      RUNNER_ARGS
        ${_RULE_RUNNER_ARGS}
      LABELS
        ${_RULE_LABELS}
      TARGET_CPU_FEATURES
        ${_RULE_TARGET_CPU_FEATURES}
      TIMEOUT
        ${_RULE_TIMEOUT}
    )
  endforeach()
endfunction()

# Helper function parsing a string occurring as an entry in TARGET_CPU_FEATURES_VARIANTS.
#
# This function has 3 output-params: variables that it sets with PARENT_SCOPE:
# _ENABLED, _FEATURES_NAME, _FEATURES.
#
# "default" is handled specially. _ENABLED is always set to "TRUE" and
# _FEATURES_NAME and _FEATURES are set to
# the empty string.
#
# Other values are parsed as "arch:features_name:features". The `arch`
# component is  matched with `IREE_ARCH`, `_ENABLED` is set to "TRUE" if and
# only if they match. In that case:
#   `_FEATURES_NAME` is set to `features_name`.
#   `_FEATURES` is set to `features`.
#
# Examples:
#
# default:
#    _ENABLED="TRUE" unconditionally,
#        other output strings are "".
#
# aarch64:dotprod:+dotprod:
#    _ENABLED="TRUE" if the target architecture is aarch64, and in that case:
#        _FEATURES_NAME="dotprod".
#        _FEATURES="+dotprod".
function(parse_target_cpu_features_variant _VARIANT_STRING _ENABLED_VAR
             _FEATURES_NAME_VAR _FEATURES_VAR)
  set("${_ENABLED_VAR}" FALSE PARENT_SCOPE)
  set("${_FEATURES_NAME_VAR}" "" PARENT_SCOPE)
  set("${_FEATURES_VAR}" "" PARENT_SCOPE)
  if("${_VARIANT_STRING}" STREQUAL "default")
    set("{_ENABLED_VAR}" TRUE PARENT_SCOPE)
    return()
  endif()
  # Interpret _VARIANT_STRING as a CMake list (;-separated).
  string(REPLACE ":" ";" _COMPONENTS "${_VARIANT_STRING}")
  list(LENGTH _COMPONENTS _NUM_COMPONENTS)
  if(NOT _NUM_COMPONENTS EQUAL 3)
    message(SEND_ERROR "TARGET_CPU_FEATURES_VARIANTS should be of the form \
    \"arch:features_name:features\". Got: \"${_VARIANT_STRING}\"")
    return()
  endif()
  list(GET _COMPONENTS 0 _FILTER_ARCH)
  list(GET _COMPONENTS 1 _FEATURES_NAME)
  list(GET _COMPONENTS 2 _FEATURES)
  if(_FILTER_ARCH STREQUAL IREE_ARCH)
    set("${_ENABLED_VAR}" TRUE PARENT_SCOPE)
    set("${_FEATURES_NAME_VAR}" "${_FEATURES_NAME}" PARENT_SCOPE)
    set("${_FEATURES_VAR}" "${_FEATURES}" PARENT_SCOPE)
  endif()
endfunction()

# iree_check_test_suite()
#
# Creates a test suite of iree-check-module tests.
#
# Mirrors the bzl rule of the same name.
#
# One test is generated per source and backend/driver pair.
# Parameters:
#   NAME: name of the generated test suite.
#   SRCS: source mlir files containing the module.
#   TARGET_BACKENDS: backends to compile the module for. These form pairs with
#       the DRIVERS argument (due to cmake limitations they are separate list
#       arguments). The lengths must exactly match. If no backends or drivers are
#       specified, a test will be generated for every supported pair.
#   DRIVERS: drivers to run the module with. These form pairs with the
#       TARGET_BACKENDS argument (due to cmake limitations they are separate list
#       arguments). The lengths must exactly match. If no backends or drivers are
#       specified, a test will be generated for every supported pair.
#   RUNNER_ARGS: additional args to pass to the underlying iree-check-module tests. The
#       driver and input file are passed automatically. To use different args per
#       test, create a separate suite or iree_check_test.
#   LABELS: Additional labels to apply to the generated tests. The package path is
#       added automatically.
#   TARGET_CPU_FEATURES_VARIANTS: list of target cpu features variants. Each
#       entry is either "default" for the architecture defaults, or a colon-
#       separated triple "arch:name:cpu_features" where "arch" filters
#       for a target CPU architecture (in IREE_ARCH format), "name" is a
#       short name for the CPU features set (used to generate target names)
#       and cpu_features is a comma-separated list of LLVM target attributes
#       to enable. Example:
#         x86_64:avx2_fma:+avx,+avx2,+fma
function(iree_check_test_suite)
  if(NOT IREE_BUILD_TESTS)
    return()
  endif()

  cmake_parse_arguments(
    _RULE
    ""
    "NAME"
    "SRCS;TARGET_BACKENDS;DRIVERS;RUNNER_ARGS;LABELS;TARGET_CPU_FEATURES_VARIANTS;TIMEOUT"
    ${ARGN}
  )

  if(_RULE_TARGET_CPU_FEATURES_VARIANTS)
    set(_TARGET_CPU_FEATURES_VARIANTS "${_RULE_TARGET_CPU_FEATURES_VARIANTS}")
  else()
    set(_TARGET_CPU_FEATURES_VARIANTS "default")
  endif()

  if(NOT DEFINED _RULE_TARGET_BACKENDS AND NOT DEFINED _RULE_DRIVERS)
    set(_RULE_TARGET_BACKENDS "vmvx" "vulkan-spirv" "llvm-cpu")
    set(_RULE_DRIVERS "local-task" "vulkan" "local-task")
  endif()

  list(LENGTH _RULE_TARGET_BACKENDS _TARGET_BACKEND_COUNT)
  list(LENGTH _RULE_DRIVERS _DRIVER_COUNT)

  if(NOT _TARGET_BACKEND_COUNT EQUAL _DRIVER_COUNT)
    message(SEND_ERROR
        "TARGET_BACKENDS count ${_TARGET_BACKEND_COUNT} does not match DRIVERS count ${_DRIVER_COUNT}")
  endif()

  math(EXPR _MAX_INDEX "${_TARGET_BACKEND_COUNT} - 1")
  foreach(_INDEX RANGE "${_MAX_INDEX}")
    list(GET _RULE_TARGET_BACKENDS ${_INDEX} _TARGET_BACKEND)
    list(GET _RULE_DRIVERS ${_INDEX} _DRIVER)
    foreach(_VARIANT_STRING IN LISTS _TARGET_CPU_FEATURES_VARIANTS)
      parse_target_cpu_features_variant("${_VARIANT_STRING}"
        _ENABLED _TARGET_CPU_FEATURES_NAME _TARGET_CPU_FEATURES)
      if(NOT _ENABLED)
        # The current entry is disabled on the target CPU architecture.
        continue()
      endif()
      set(_TARGET_CPU_FEATURES_SUFFIX "")
      set(_LABELS "${_RULE_LABELS}")
      if (_TARGET_CPU_FEATURES_NAME)
        set(_TARGET_CPU_FEATURES_SUFFIX "_${_TARGET_CPU_FEATURES_NAME}")
        list(APPEND _LABELS "cpu_features=${_TARGET_CPU_FEATURES_NAME}")
      endif()
      iree_check_single_backend_test_suite(
        NAME
          "${_RULE_NAME}_${_TARGET_BACKEND}_${_DRIVER}${_TARGET_CPU_FEATURES_SUFFIX}"
        SRCS
          ${_RULE_SRCS}
        TARGET_BACKEND
          ${_TARGET_BACKEND}
        DRIVER
          ${_DRIVER}
        COMPILER_FLAGS
          ${_RULE_COMPILER_FLAGS}
        RUNNER_ARGS
          ${_RULE_RUNNER_ARGS}
        LABELS
          ${_LABELS}
        TARGET_CPU_FEATURES
          ${_TARGET_CPU_FEATURES}
        TIMEOUT
          ${_RULE_TIMEOUT}
      )
    endforeach()
  endforeach()
endfunction()