Add support for a clang-tidy linter. Add a files utility function.

.clang-tidy

@@ -13,6 +13,7 @@ misc-*,
 llvm-*,
 google-*,
 -modernize-use-trailing-return-type,
+-misc-confusable-identifiers,
 -readability-identifier-length,
 -cppcoreguidelines-owning-memory,
 -bugprone-easily-swappable-parameters,

CMakeLists.txt

@@ -368,9 +368,9 @@ else()
 endif()
 
 include_directories (
-  ${P4C_SOURCE_DIR}/extensions
   ${P4C_SOURCE_DIR}
   ${P4C_BINARY_DIR}
+  ${P4C_SOURCE_DIR}/extensions
   )
 add_definitions (-DCONFIG_PREFIX="${CMAKE_INSTALL_PREFIX}")
 add_definitions (-DCONFIG_PKGDATADIR="${CMAKE_INSTALL_PREFIX}/${P4C_ARTIFACTS_OUTPUT_DIRECTORY}")

cmake/Linters.cmake

@@ -18,7 +18,6 @@ file(
   tools/*.h
 )
 # Filter some folders from the CI checks.
-list(FILTER P4C_LINT_LIST EXCLUDE REGEX "backends/p4tools/submodules")
 list(FILTER P4C_LINT_LIST EXCLUDE REGEX "backends/ebpf/runtime")
 list(FILTER P4C_LINT_LIST EXCLUDE REGEX "backends/ubpf/runtime")
 list(FILTER P4C_LINT_LIST EXCLUDE REGEX "control-plane/p4runtime")
@@ -29,7 +28,7 @@ list(FILTER P4C_LINT_LIST EXCLUDE REGEX "test/frameworks")
 add_cpplint_files(${P4C_SOURCE_DIR} "${P4C_LINT_LIST}")
 
 # Retrieve the global cpplint property.
-get_property(CPPLINT_FILES GLOBAL PROPERTY cpplint-files)
+get_property(CPPLINT_FILES GLOBAL PROPERTY CPPLINT-files)
 
 if(DEFINED CPPLINT_FILES)
   # Write the list to a file. We need to do this as too many files will reach
@@ -58,17 +57,15 @@ endif()
 add_clang_format_files(${P4C_SOURCE_DIR} "${P4C_LINT_LIST}")
 
 find_program(CLANG_FORMAT_CMD clang-format)
-
-if(NOT ${CLANG_FORMAT_CMD})
+if(CLANG_FORMAT_CMD)
   # Retrieve the global clang-format property.
-  get_property(CLANG_FORMAT_FILES GLOBAL PROPERTY clang-format-files)
+  get_property(CLANG_FORMAT_FILES GLOBAL PROPERTY CLANG_FORMAT-files)
   if(DEFINED CLANG_FORMAT_FILES)
     # Write the list to a file.
     # We need to do this as too many files will reach the shell argument limit.
     set(CLANG_FORMAT_TXT_FILE ${P4C_BINARY_DIR}/clang_format_files.txt)
     list(SORT CLANG_FORMAT_FILES)
     file(WRITE ${CLANG_FORMAT_TXT_FILE} "${CLANG_FORMAT_FILES}")
-    set(CLANG_FORMAT_CMD clang-format)
     add_custom_target(
       clang-format
       COMMAND xargs -a ${CLANG_FORMAT_TXT_FILE} -r -d '\;' ${CLANG_FORMAT_CMD} --verbose --Werror --dry-run -i -- || (echo ${RED}clang-format failed. Run \"make clang-format-fix-errors\" to fix the complaints.${COLOURRESET} && false)
@@ -83,7 +80,49 @@ if(NOT ${CLANG_FORMAT_CMD})
     )
   endif()
 else()
-  message(WARNING "clang-format executable not found. Disabling clang-format checks. clang-format can be installed with \"pip3 install --user --upgrade clang-format\"")
+  message(WARNING "clang-format executable not found. Disabling clang-format checks. clang-format can be installed with \"pip3 install --user --upgrade clang-format\" or your distribution's package manager.")
+endif()
+
+
+#################### CLANG-TIDY
+
+# TODO: Add files here once clang-tidy is fast enough.
+# file(
+#   GLOB_RECURSE P4C_CLANG_TIDY_LINT_LIST  FOLLOW_SYMLINKS
+# )
+# add_clang_tidy_files(${P4C_SOURCE_DIR} "${P4C_CLANG_TIDY_LINT_LIST}")
+
+find_program(CLANG_TIDY_CMD clang-tidy)
+
+if(CLANG_TIDY_CMD)
+  if (NOT CMAKE_EXPORT_COMPILE_COMMANDS)
+    message(WARNING "CMAKE_EXPORT_COMPILE_COMMANDS is not set ON, clang-tidy remains disabled.")
+  endif()
+
+  # Retrieve the global clang-tidy property.
+  get_property(CLANG_TIDY_FILES GLOBAL PROPERTY CLANG_TIDY-files)
+  if(DEFINED CLANG_TIDY_FILES AND CMAKE_EXPORT_COMPILE_COMMANDS)
+
+    # Write the list to a file.
+    # We need to do this as too many files will reach the shell argument limit.
+    set(CLANG_TIDY_TXT_FILE ${P4C_BINARY_DIR}/clang_tidy_files.txt)
+    list(SORT CLANG_TIDY_FILES)
+    file(WRITE ${CLANG_TIDY_TXT_FILE} "${CLANG_TIDY_FILES}")
+    add_custom_target(
+      clang-tidy
+      COMMAND xargs -a ${CLANG_TIDY_TXT_FILE} -r -d '\;' ${CLANG_TIDY_CMD} -p ${CMAKE_BINARY_DIR}
+      WORKING_DIRECTORY ${P4C_SOURCE_DIR}
+      COMMENT "Applying clang-tidy analysis."
+    )
+    add_custom_target(
+      clang-tidy-apply-fix-its
+      COMMAND xargs -a ${CLANG_TIDY_TXT_FILE} -r -d '\;' ${CLANG_TIDY_CMD} -p ${CMAKE_BINARY_DIR} --fix
+      WORKING_DIRECTORY ${P4C_SOURCE_DIR}
+      COMMENT "Applying clang-tidy fix-its."
+    )
+  endif()
+else()
+  message(WARNING "clang-tidy executable not found. Disabling clang-tidy checks. clang-tidy can be installed with \"pip3 install --user --upgrade clang-tidy\" or your distribution's package manager.")
 endif()
 
 
@@ -105,9 +144,9 @@ find_program(BLACK_CMD black)
 find_program(ISORT_CMD isort)
 
 # Black and isort share the same files and should be run together.
-if(NOT ${BLACK_CMD} OR NOT (NOT ${ISORT_CMD}))
+if(BLACK_CMD AND ISORT_CMD)
   # Retrieve the global black property.
-  get_property(BLACK_FILES GLOBAL PROPERTY black-files)
+  get_property(BLACK_FILES GLOBAL PROPERTY BLACK-files)
   if(DEFINED BLACK_FILES)
     # Write the list to a file.
     # We need to do this as too many files will reach the shell argument limit.
@@ -141,7 +180,7 @@ if(NOT ${BLACK_CMD} OR NOT (NOT ${ISORT_CMD}))
     )
   endif()
 else()
-  message(WARNING "black or isort executable not found. Disabling black/isort checks. black/isort can be installed with \"pip3 install --user --upgrade black\" and \"pip3 install --user --upgrade isort\" ")
+  message(WARNING "black or isort executable not found. Disabling black/isort checks. black/isort can be installed with \"pip3 install --user --upgrade black\" and \"pip3 install --user --upgrade isort\" or your distribution's package manager. ")
 endif()
 
 #################### IWYU

cmake/P4CUtils.cmake

@@ -67,76 +67,48 @@ macro (p4c_add_library name symbol var)
   endif()
 endmacro(p4c_add_library)
 
-# Add files with the appropriate path to the list of cpplint-linted files.
-function(add_cpplint_files dir filelist)
+# Utility function which adds @param filelist to a global list of ${label}-files
+function(add_files dir filelist label)
   if (NOT filelist)
     message(WARNING "Input file list is empty. Returning.")
     return()
   endif()
   # Initialize an empty list.
-  set (__cpplintFileList "")
+  set (__FileList "")
   foreach(__f ${filelist})
     string(REGEX MATCH "^/.*" abs_path "${__f}")
     if (NOT ${abs_path} EQUAL "")
-      list (APPEND __cpplintFileList "${__f}")
+      list (APPEND __FileList "${__f}")
     else()
-      list (APPEND __cpplintFileList "${dir}/${__f}")
+      list (APPEND __FileList "${dir}/${__f}")
     endif()
   endforeach(__f)
 
-  # Get the global cpplint property and append to it.
-  get_property(CPPLINT_FILES GLOBAL PROPERTY cpplint-files)
-  list (APPEND CPPLINT_FILES "${__cpplintFileList}")
-  list(REMOVE_DUPLICATES CPPLINT_FILES)
-  set_property(GLOBAL PROPERTY cpplint-files "${CPPLINT_FILES}")
+  # Get the global label property and append to it.
+  get_property(${label}_FILES GLOBAL PROPERTY ${label}-files)
+  list (APPEND ${label}_FILES "${__FileList}")
+  list(REMOVE_DUPLICATES ${label}_FILES)
+  set_property(GLOBAL PROPERTY ${label}-files "${${label}_FILES}")
+endfunction(add_files)
+
+# Add files with the appropriate path to the list of cpplint-linted files.
+function(add_cpplint_files dir filelist)
+  add_files(${dir} "${filelist}" CPPLINT)
 endfunction(add_cpplint_files)
 
 # Add files with the appropriate path to the list of clang-format-linted files.
 function(add_clang_format_files dir filelist)
-  if (NOT filelist)
-    message(WARNING "Input file list is empty. Returning.")
-    return()
-  endif()
-  # Initialize an empty list.
-  set (__clangFormatFileList "")
-  foreach(__f ${filelist})
-    string(REGEX MATCH "^/.*" abs_path "${__f}")
-    if (NOT ${abs_path} EQUAL "")
-      list (APPEND __clangFormatFileList "${__f}")
-    else()
-      list (APPEND __clangFormatFileList "${dir}/${__f}")
-    endif()
-  endforeach(__f)
-
-  # Get the global clang-format property and append to it.
-  get_property(CLANG_FORMAT_FILES GLOBAL PROPERTY clang-format-files)
-  list (APPEND CLANG_FORMAT_FILES "${__clangFormatFileList}")
-  list(REMOVE_DUPLICATES CLANG_FORMAT_FILES)
-  set_property(GLOBAL PROPERTY clang-format-files "${CLANG_FORMAT_FILES}")
+  add_files(${dir} "${filelist}" CLANG_FORMAT)
 endfunction(add_clang_format_files)
 
+# Add files with the appropriate path to the list of clang-tidy-linted files.
+function(add_clang_tidy_files dir filelist)
+  add_files(${dir} "${filelist}" CLANG_TIDY)
+endfunction(add_clang_tidy_files)
+
 # Add files with the appropriate path to the list of black-linted files.
 function(add_black_files dir filelist)
-  if (NOT filelist)
-    message(WARNING "Input file list is empty. Returning.")
-    return()
-  endif()
-  # Initialize an empty list.
-  set (__blackFileList "")
-  foreach(__f ${filelist})
-    string(REGEX MATCH "^/.*" abs_path "${__f}")
-    if (NOT ${abs_path} EQUAL "")
-      list (APPEND __blackFileList "${__f}")
-    else()
-      list (APPEND __blackFileList "${dir}/${__f}")
-    endif()
-  endforeach(__f)
-
-  # Get the global clang-format property and append to it.
-  get_property(BLACK_FILES GLOBAL PROPERTY black-files)
-  list (APPEND BLACK_FILES "${__blackFileList}")
-  list(REMOVE_DUPLICATES BLACK_FILES)
-  set_property(GLOBAL PROPERTY black-files "${BLACK_FILES}")
+  add_files(${dir} "${filelist}" BLACK)
 endfunction(add_black_files)
 
 macro(p4c_test_set_name name tag alias)