117 lines
4.1 KiB
CMake
117 lines
4.1 KiB
CMake
# Copyright 2020 The Dawn Authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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find_package(PythonInterp REQUIRED)
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message(STATUS "Dawn: using python at ${PYTHON_EXECUTABLE}")
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# Check for Jinja2
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if (NOT DAWN_JINJA2_DIR)
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message(STATUS "Dawn: Using system jinja2")
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execute_process(
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COMMAND ${PYTHON_EXECUTABLE} -c "import jinja2"
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RESULT_VARIABLE RET
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)
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if (NOT RET EQUAL 0)
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message(FATAL_ERROR "Dawn: Missing dependencies for code generation, please ensure you have python-jinja2 installed.")
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endif()
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else()
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message(STATUS "Dawn: Using jinja2 at ${DAWN_JINJA2_DIR}")
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endif()
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# Function to invoke a generator_lib.py generator.
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# - SCRIPT is the name of the script to call
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# - ARGS are the extra arguments to pass to the script in addition to the base generator_lib.py arguments
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# - PRINT_NAME is the name to use when outputting status or errors
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# - RESULT_VARIABLE will be modified to contain the list of files generated by this generator
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function(DawnGenerator)
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set(oneValueArgs SCRIPT RESULT_VARIABLE PRINT_NAME)
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set(multiValueArgs ARGS)
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cmake_parse_arguments(G "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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# Build the set of args common to all invocation of that generator.
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set(BASE_ARGS
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${PYTHON_EXECUTABLE}
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${G_SCRIPT}
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--template-dir
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"${DAWN_TEMPLATE_DIR}"
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--root-dir
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"${Dawn_SOURCE_DIR}"
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--output-dir
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"${DAWN_BUILD_GEN_DIR}"
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${G_ARGS}
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)
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if (DAWN_JINJA2_DIR)
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list(APPEND BASE_ARGS --jinja2-path ${DAWN_JINJA2_DIR})
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endif()
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# Call the generator to get the list of its dependencies.
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execute_process(
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COMMAND ${BASE_ARGS} --print-cmake-dependencies
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OUTPUT_VARIABLE DEPENDENCIES
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RESULT_VARIABLE RET
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)
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if (NOT RET EQUAL 0)
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message(FATAL_ERROR "Dawn: Failed to get the dependencies for ${G_PRINT_NAME}. Base args are '${BASE_ARGS}'.")
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endif()
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# Ask CMake to re-run if any of the dependencies changed as it might modify the build graph.
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if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.12.0")
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set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${DEPENDENCIES})
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endif()
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# Call the generator to get the list of its outputs.
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execute_process(
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COMMAND ${BASE_ARGS} --print-cmake-outputs
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OUTPUT_VARIABLE OUTPUTS
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RESULT_VARIABLE RET
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)
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if (NOT RET EQUAL 0)
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message(FATAL_ERROR "Dawn: Failed to get the outputs for ${G_PRINT_NAME}. Base args are '${BASE_ARGS}'.")
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endif()
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# Add the custom command that calls the generator.
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add_custom_command(
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COMMAND ${BASE_ARGS}
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DEPENDS ${DEPENDENCIES}
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OUTPUT ${OUTPUTS}
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COMMENT "Dawn: Generating files for ${G_PRINT_NAME}."
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)
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# Return the list of outputs.
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set(${G_RESULT_VARIABLE} ${OUTPUTS} PARENT_SCOPE)
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endfunction()
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# Helper function to call dawn_generator.py:
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# - TARGET is the generator target to build
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# - PRINT_NAME and RESULT_VARIABLE are like for DawnGenerator
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function(DawnJSONGenerator)
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set(oneValueArgs TARGET RESULT_VARIABLE)
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cmake_parse_arguments(G "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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DawnGenerator(
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SCRIPT "${Dawn_SOURCE_DIR}/generator/dawn_json_generator.py"
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ARGS --dawn-json
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"${Dawn_SOURCE_DIR}/dawn.json"
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--wire-json
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"${Dawn_SOURCE_DIR}/dawn_wire.json"
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--targets
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${G_TARGET}
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RESULT_VARIABLE RET
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${G_UNPARSED_ARGUMENTS}
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)
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# Forward the result up one more scope
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set(${G_RESULT_VARIABLE} ${RET} PARENT_SCOPE)
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endfunction()
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