Differential D5321 Diff 18752 cmake/modules/Coverage.cmake

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cmake/modules/Coverage.cmake

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				# Copyright (c) 2020 The Bitcoin developers
				###############################################################################
				# Provide support for building test coverage reports.
				#
				# Dependencies:
				# - c++filt
				# - gcov
				# - genhtml
				# - lcov
				# - python3
				#
				# The basic workflow for building coverage report is as follow:
				# 1/ Build the instrumented code by passing the --coverage flag to the
				# compiler. For better accuracy there should be no optimization.
				# 2/ Build the code, prior to run any test. Capture an initial state with
				# `lcov` to get a baseline for the coverage information (function names,
				# number of lines). This is achieved by running the `coverage-baseline`
				# target.
				# 3/ The coverage data is filtered to remove coverage info from code which is
				# not of interest (such as 3rd party libs, generated files, etc.).
				# 4/ Run the tests, and capture the generated coverage data with `lcov`. Again,
				# the coverage data is filtered. After the test target has run, the
				# coverage counters are reset in order to make each test run produce an
				# independent output.
				# 5/ Combine the test coverage data with the baseline data using `lcov` to
				# produce the final coverage information for the test.
				# 6/ Use `genhtml` to generate a HTML report from the combined coverage data.
				#
				# How to use:
				# 1/ Enable coverage with the `enable_coverage()` function. The branch coverage
				# can be enabled by setting the `ENABLE_BRANCH_COVERAGE` parameter to true.
				# 2/ Call `exclude_from_coverage()` to exclude paths from the coverage report.
				# 3/ Use `add_custom_target_coverage()` to enable coverage reporting for your
				# test target. This generates a new `coverage-<target>` target that will run
				# the tests and create the HTML report in a `<target.coverage>` directory.
				###############################################################################

				include(SanitizeHelper)

				# Exclude directories (and subdirectories) from the coverage report.
				function(exclude_from_coverage)
				foreach(_dir ${ARGN})
				get_filename_component(_abspath "${_dir}" ABSOLUTE)
				set_property(GLOBAL APPEND_STRING PROPERTY LCOV_FILTER_PATTERN " -p ${_abspath}")
				endforeach()
				endfunction()

				function(enable_coverage ENABLE_BRANCH_COVERAGE)
				set(__ENABLE_COVERAGE ON CACHE INTERNAL "Coverage is enabled")

				# Required dependencies.
				# c++filt is needed to demangle c++ function names at HTML generation time.
				include(DoOrFail)
				find_program_or_fail(LCOV_EXECUTABLE lcov)
				find_program_or_fail(GCOV_EXECUTABLE gcov)
				find_program_or_fail(GENHTML_EXECUTABLE genhtml)
				find_program_or_fail(CXXFILT_EXECUTABLE c++filt)
				find_package(Python3 COMPONENTS Interpreter REQUIRED)
				set(__COVERAGE_PYTHON "${Python3_EXECUTABLE}" CACHE PATH "Path to the Python interpreter")

				get_property(_project_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
				set(COVERAGE_FLAG --coverage)

				foreach(_language ${_project_languages})
				sanitize_c_cxx_definition(
				"supports_${_language}_"
				${COVERAGE_FLAG}
				SUPPORTS_COVERAGE
				)

				set(_save_linker_flags ${CMAKE_EXE_LINKER_FLAGS})
				string(APPEND CMAKE_EXE_LINKER_FLAGS " ${COVERAGE_FLAG}")

				if("${_language}" STREQUAL "C")
				include(CheckCCompilerFlag)
				CHECK_C_COMPILER_FLAG(${COVERAGE_FLAG} ${SUPPORTS_COVERAGE})
				elseif("${_language}" STREQUAL "CXX")
				include(CheckCXXCompilerFlag)
				CHECK_CXX_COMPILER_FLAG(${COVERAGE_FLAG} ${SUPPORTS_COVERAGE})
				else()
				message(WARNING "Coverage is not supported for the ${_language} language")
				endif()

				set(CMAKE_EXE_LINKER_FLAGS ${_save_linker_flags})

				if(NOT ${SUPPORTS_COVERAGE})
				message(FATAL_ERROR "The ${COVERAGE_FLAG} option is not supported by your ${_language} compiler")
				endif()

				add_compile_options($<$<COMPILE_LANGUAGE:${_language}>:${COVERAGE_FLAG}>)
				add_link_options($<$<COMPILE_LANGUAGE:${_language}>:${COVERAGE_FLAG}>)
				endforeach()

				# Exclude some path by default, such as system headers and generated files.
				exclude_from_coverage(
				"${CMAKE_BINARY_DIR}"
				"/usr/include"
				"/usr/lib"
				"/usr/lib64"
				)

				if(ENABLE_BRANCH_COVERAGE)
				string(APPEND LCOV_OPTIONS "--rc lcov_branch_coverage=1")
				set(LCOV_OPTIONS "${LCOV_OPTIONS}" CACHE STRING "Lcov options")
				endif()
				endfunction()

				function(add_custom_target_coverage TARGET)
				# Coverage should have been enabled in order to create the new coverage-*
				# targets.
				if(NOT __ENABLE_COVERAGE)
				return()
				endif()

				get_property(LCOV_FILTER_PATTERN GLOBAL PROPERTY LCOV_FILTER_PATTERN)

				# Make sure we generate the base coverage data before building this target.
				if(NOT TARGET coverage-baseline)
				configure_file(
				"${CMAKE_SOURCE_DIR}/cmake/templates/CoverageBaseline.sh.in"
				"${CMAKE_BINARY_DIR}/CoverageBaseline.sh"
				)

				add_custom_command(
				COMMENT "Generating baseline coverage info"
				OUTPUT "${CMAKE_BINARY_DIR}/baseline.info"
				COMMAND "${CMAKE_BINARY_DIR}/CoverageBaseline.sh"
				VERBATIM USES_TERMINAL
				)

				add_custom_target(coverage-baseline
				DEPENDS "${CMAKE_BINARY_DIR}/baseline.info"
				)
				endif()

				sanitize_c_cxx_definition("" "${TARGET}" SANITIZED_TARGET)

				configure_file(
				"${CMAKE_SOURCE_DIR}/cmake/templates/CoverageTest.sh.in"
				"${CMAKE_BINARY_DIR}/Coverage-${TARGET}.sh"
				)

				add_custom_target(coverage-${TARGET}
				DEPENDS coverage-baseline ${TARGET}
				COMMENT "Generating ${TARGET} coverage report"
				COMMAND "${CMAKE_BINARY_DIR}/Coverage-${TARGET}.sh"
				VERBATIM USES_TERMINAL
				)
				endfunction()