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# Copyright 2020 The Dawn Authors
#
# 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.
find_package(PythonInterp REQUIRED)
message(STATUS "Dawn: using python at ${PYTHON_EXECUTABLE}")
# Check for Jinja2
if (NOT DAWN_JINJA2_DIR)
message(STATUS "Dawn: Using system jinja2")
execute_process(
COMMAND ${PYTHON_EXECUTABLE} -c "import jinja2"
RESULT_VARIABLE RET
)
if (NOT RET EQUAL 0)
message(FATAL_ERROR "Dawn: Missing dependencies for code generation, please ensure you have python-jinja2 installed.")
endif()
else()
message(STATUS "Dawn: using jinja2 at ${DAWN_JINJA2_DIR}")
endif()
# Function to invoke a generator_lib.py generator.
# - SCRIPT is the name of the script to call
# - ARGS are the extra arguments to pass to the script in addition to the base generator_lib.py arguments
# - PRINT_NAME is the name to use when outputting status or errors
# - RESULT_VARIABLE will be modified to contain the list of files generated by this generator
function(DawnGenerator)
set(oneValueArgs SCRIPT RESULT_VARIABLE PRINT_NAME)
set(multiValueArgs ARGS)
cmake_parse_arguments(G "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
# Build the set of args common to all invocation of that generator.
set(BASE_ARGS
${PYTHON_EXECUTABLE}
${G_SCRIPT}
--template-dir
"${DAWN_TEMPLATE_DIR}"
--root-dir
"${Dawn_SOURCE_DIR}"
--output-dir
"${DAWN_BUILD_GEN_DIR}"
${G_ARGS}
)
if (DAWN_JINJA2_DIR)
list(APPEND BASE_ARGS --jinja2-path ${DAWN_JINJA2_DIR})
endif()
# Call the generator to get the list of its dependencies.
execute_process(
COMMAND ${BASE_ARGS} --print-cmake-dependencies
OUTPUT_VARIABLE DEPENDENCIES
RESULT_VARIABLE RET
)
if (NOT RET EQUAL 0)
message(FATAL_ERROR "Dawn: Failed to get the dependencies for ${G_PRINT_NAME}. Base args are '${BASE_ARGS}'.")
endif()
# Ask CMake to re-run if any of the dependencies changed as it might modify the build graph.
if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.12.0")
set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${DEPENDENCIES})
endif()
# Call the generator to get the list of its outputs.
execute_process(
COMMAND ${BASE_ARGS} --print-cmake-outputs
OUTPUT_VARIABLE OUTPUTS
RESULT_VARIABLE RET
)
if (NOT RET EQUAL 0)
message(FATAL_ERROR "Dawn: Failed to get the outputs for ${G_PRINT_NAME}. Base args are '${BASE_ARGS}'.")
endif()
# Add the custom command that calls the generator.
add_custom_command(
COMMAND ${BASE_ARGS}
DEPENDS ${DEPENDENCIES}
OUTPUT ${OUTPUTS}
COMMENT "Dawn: Generating files for ${G_PRINT_NAME}."
)
# Return the list of outputs.
set(${G_RESULT_VARIABLE} ${OUTPUTS} PARENT_SCOPE)
endfunction()
# Helper function to call dawn_generator.py:
# - TARGET is the generator target to build
# - PRINT_NAME and RESULT_VARIABLE are like for DawnGenerator
function(DawnJSONGenerator)
set(oneValueArgs TARGET RESULT_VARIABLE)
cmake_parse_arguments(G "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
DawnGenerator(
SCRIPT "${Dawn_SOURCE_DIR}/generator/dawn_json_generator.py"
ARGS --dawn-json
"${Dawn_SOURCE_DIR}/dawn.json"
--wire-json
"${Dawn_SOURCE_DIR}/dawn_wire.json"
--targets
${G_TARGET}
RESULT_VARIABLE RET
${G_UNPARSED_ARGUMENTS}
)
# Forward the result up one more scope
set(${G_RESULT_VARIABLE} ${RET} PARENT_SCOPE)
endfunction()