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f521e30212
Summary:
This patch adds a LLVM_ENABLE_GISEL_COV which, like LLVM_ENABLE_DAGISEL_COV,
causes TableGen to instrument the generated table to collect rule coverage
information. However, LLVM_ENABLE_GISEL_COV goes a bit further than
LLVM_ENABLE_DAGISEL_COV. The information is written to files
(${CMAKE_BINARY_DIR}/gisel-coverage-* by default). These files can then be
concatenated into ${LLVM_GISEL_COV_PREFIX}-all after which TableGen will
read this information and use it to emit warnings about untested rules.
This technique could also be used by SelectionDAG and can be further
extended to detect hot rules and give them priority over colder rules.
Usage:
* Enable LLVM_ENABLE_GISEL_COV in CMake
* Build the compiler and run some tests
* cat gisel-coverage-[0-9]* > gisel-coverage-all
* Delete lib/Target/*/*GenGlobalISel.inc*
* Build the compiler
Known issues:
* ${LLVM_GISEL_COV_PREFIX}-all must be generated as a manual
step due to a lack of a portable 'cat' command. It should be the
concatenation of all ${LLVM_GISEL_COV_PREFIX}-[0-9]* files.
* There's no mechanism to discard coverage information when the ruleset
changes
Depends on D39742
Reviewers: ab, qcolombet, t.p.northover, aditya_nandakumar, rovka
Reviewed By: rovka
Subscribers: vsk, arsenm, nhaehnle, mgorny, kristof.beyls, javed.absar, igorb, llvm-commits
Differential Revision: https://reviews.llvm.org/D39747
llvm-svn: 318356
184 lines
7.2 KiB
CMake
184 lines
7.2 KiB
CMake
# LLVM_TARGET_DEFINITIONS must contain the name of the .td file to process.
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# Extra parameters for `tblgen' may come after `ofn' parameter.
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# Adds the name of the generated file to TABLEGEN_OUTPUT.
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include(LLVMExternalProjectUtils)
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if(LLVM_MAIN_INCLUDE_DIR)
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set(LLVM_TABLEGEN_FLAGS -I ${LLVM_MAIN_INCLUDE_DIR})
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endif()
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function(tablegen project ofn)
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# Validate calling context.
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if(NOT ${project}_TABLEGEN_EXE)
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message(FATAL_ERROR "${project}_TABLEGEN_EXE not set")
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endif()
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# Use depfile instead of globbing arbitrary *.td(s)
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# DEPFILE is available for Ninja Generator with CMake>=3.7.
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if(CMAKE_GENERATOR STREQUAL "Ninja" AND NOT CMAKE_VERSION VERSION_LESS 3.7)
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# Make output path relative to build.ninja, assuming located on
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# ${CMAKE_BINARY_DIR}.
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# CMake emits build targets as relative paths but Ninja doesn't identify
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# absolute path (in *.d) as relative path (in build.ninja)
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# Note that tblgen is executed on ${CMAKE_BINARY_DIR} as working directory.
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file(RELATIVE_PATH ofn_rel
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${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_BINARY_DIR}/${ofn})
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set(additional_cmdline
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-o ${ofn_rel}.tmp
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-d ${ofn_rel}.d
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WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
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DEPFILE ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.d
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)
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set(local_tds)
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set(global_tds)
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else()
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file(GLOB local_tds "*.td")
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file(GLOB_RECURSE global_tds "${LLVM_MAIN_INCLUDE_DIR}/llvm/*.td")
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set(additional_cmdline
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-o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
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)
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endif()
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if (IS_ABSOLUTE ${LLVM_TARGET_DEFINITIONS})
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set(LLVM_TARGET_DEFINITIONS_ABSOLUTE ${LLVM_TARGET_DEFINITIONS})
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else()
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set(LLVM_TARGET_DEFINITIONS_ABSOLUTE
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${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS})
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endif()
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if (LLVM_ENABLE_DAGISEL_COV)
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list(FIND ARGN "-gen-dag-isel" idx)
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if( NOT idx EQUAL -1 )
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list(APPEND LLVM_TABLEGEN_FLAGS "-instrument-coverage")
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endif()
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endif()
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if (LLVM_ENABLE_GISEL_COV)
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list(FIND ARGN "-gen-global-isel" idx)
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if( NOT idx EQUAL -1 )
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list(APPEND LLVM_TABLEGEN_FLAGS "-instrument-gisel-coverage")
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list(APPEND LLVM_TABLEGEN_FLAGS "-gisel-coverage-file=${LLVM_GISEL_COV_PREFIX}all")
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endif()
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endif()
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# We need both _TABLEGEN_TARGET and _TABLEGEN_EXE in the DEPENDS list
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# (both the target and the file) to have .inc files rebuilt on
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# a tablegen change, as cmake does not propagate file-level dependencies
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# of custom targets. See the following ticket for more information:
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# https://cmake.org/Bug/view.php?id=15858
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# The dependency on both, the target and the file, produces the same
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# dependency twice in the result file when
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# ("${${project}_TABLEGEN_TARGET}" STREQUAL "${${project}_TABLEGEN_EXE}")
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# but lets us having smaller and cleaner code here.
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add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
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# Generate tablegen output in a temporary file.
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COMMAND ${${project}_TABLEGEN_EXE} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR}
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${LLVM_TABLEGEN_FLAGS}
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${LLVM_TARGET_DEFINITIONS_ABSOLUTE}
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${additional_cmdline}
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# The file in LLVM_TARGET_DEFINITIONS may be not in the current
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# directory and local_tds may not contain it, so we must
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# explicitly list it here:
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DEPENDS ${${project}_TABLEGEN_TARGET} ${${project}_TABLEGEN_EXE}
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${local_tds} ${global_tds}
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${LLVM_TARGET_DEFINITIONS_ABSOLUTE}
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COMMENT "Building ${ofn}..."
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)
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add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
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# Only update the real output file if there are any differences.
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# This prevents recompilation of all the files depending on it if there
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# aren't any.
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COMMAND ${CMAKE_COMMAND} -E copy_if_different
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${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
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${CMAKE_CURRENT_BINARY_DIR}/${ofn}
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DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
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COMMENT "Updating ${ofn}..."
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)
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# `make clean' must remove all those generated files:
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set_property(DIRECTORY APPEND
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PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${ofn}.tmp ${ofn})
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set(TABLEGEN_OUTPUT ${TABLEGEN_OUTPUT} ${CMAKE_CURRENT_BINARY_DIR}/${ofn} PARENT_SCOPE)
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set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${ofn} PROPERTIES
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GENERATED 1)
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endfunction()
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# Creates a target for publicly exporting tablegen dependencies.
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function(add_public_tablegen_target target)
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if(NOT TABLEGEN_OUTPUT)
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message(FATAL_ERROR "Requires tablegen() definitions as TABLEGEN_OUTPUT.")
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endif()
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add_custom_target(${target}
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DEPENDS ${TABLEGEN_OUTPUT})
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if(LLVM_COMMON_DEPENDS)
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add_dependencies(${target} ${LLVM_COMMON_DEPENDS})
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endif()
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set_target_properties(${target} PROPERTIES FOLDER "Tablegenning")
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set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} ${target} PARENT_SCOPE)
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endfunction()
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macro(add_tablegen target project)
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set(${target}_OLD_LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS})
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set(LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS} TableGen)
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# CMake-3.9 doesn't let compilation units depend on their dependent libraries.
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if(NOT (CMAKE_GENERATOR STREQUAL "Ninja" AND NOT CMAKE_VERSION VERSION_LESS 3.9) AND NOT XCODE)
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# FIXME: It leaks to user, callee of add_tablegen.
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set(LLVM_ENABLE_OBJLIB ON)
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endif()
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add_llvm_executable(${target} DISABLE_LLVM_LINK_LLVM_DYLIB ${ARGN})
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set(LLVM_LINK_COMPONENTS ${${target}_OLD_LLVM_LINK_COMPONENTS})
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set(${project}_TABLEGEN "${target}" CACHE
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STRING "Native TableGen executable. Saves building one when cross-compiling.")
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# Upgrade existing LLVM_TABLEGEN setting.
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if(${project} STREQUAL LLVM)
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if(${LLVM_TABLEGEN} STREQUAL tblgen)
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set(LLVM_TABLEGEN "${target}" CACHE
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STRING "Native TableGen executable. Saves building one when cross-compiling."
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FORCE)
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endif()
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endif()
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# Effective tblgen executable to be used:
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set(${project}_TABLEGEN_EXE ${${project}_TABLEGEN} PARENT_SCOPE)
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set(${project}_TABLEGEN_TARGET ${${project}_TABLEGEN} PARENT_SCOPE)
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if(LLVM_USE_HOST_TOOLS)
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if( ${${project}_TABLEGEN} STREQUAL "${target}" )
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if (NOT CMAKE_CONFIGURATION_TYPES)
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set(${project}_TABLEGEN_EXE "${LLVM_NATIVE_BUILD}/bin/${target}")
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else()
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set(${project}_TABLEGEN_EXE "${LLVM_NATIVE_BUILD}/Release/bin/${target}")
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endif()
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set(${project}_TABLEGEN_EXE ${${project}_TABLEGEN_EXE} PARENT_SCOPE)
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llvm_ExternalProject_BuildCmd(tblgen_build_cmd ${target}
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${LLVM_NATIVE_BUILD}
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CONFIGURATION Release)
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add_custom_command(OUTPUT ${${project}_TABLEGEN_EXE}
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COMMAND ${tblgen_build_cmd}
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DEPENDS CONFIGURE_LLVM_NATIVE ${target}
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WORKING_DIRECTORY ${LLVM_NATIVE_BUILD}
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COMMENT "Building native TableGen..."
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USES_TERMINAL)
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add_custom_target(${project}-tablegen-host DEPENDS ${${project}_TABLEGEN_EXE})
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set(${project}_TABLEGEN_TARGET ${project}-tablegen-host PARENT_SCOPE)
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endif()
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endif()
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if (${project} STREQUAL LLVM AND NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
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if(${target} IN_LIST LLVM_DISTRIBUTION_COMPONENTS OR
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NOT LLVM_DISTRIBUTION_COMPONENTS)
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set(export_to_llvmexports EXPORT LLVMExports)
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endif()
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install(TARGETS ${target}
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${export_to_llvmexports}
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RUNTIME DESTINATION ${LLVM_TOOLS_INSTALL_DIR})
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endif()
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set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${target})
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endmacro()
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