This patch series adds Clang support for gcov. Patch 1 refactors existing code in preparation for Clang support. Patch 2 implements necessary LLVM runtime hooks and gcov kernel interfaces. Patch 3 updates documentation.
Greg Hackmann (2): gcov: Clang: move common GCC code into gcc_base.c gcov: Clang support Tri Vo (1): gcov: docs: add a note on GCC vs Clang differences Documentation/dev-tools/gcov.rst | 18 +- kernel/gcov/Kconfig | 3 +- kernel/gcov/Makefile | 5 +- kernel/gcov/base.c | 86 +---- kernel/gcov/clang.c | 586 +++++++++++++++++++++++++++++++ kernel/gcov/gcc_3_4.c | 12 + kernel/gcov/gcc_4_7.c | 12 + kernel/gcov/gcc_base.c | 86 +++++ kernel/gcov/gcov.h | 5 + 9 files changed, 723 insertions(+), 90 deletions(-) create mode 100644 kernel/gcov/clang.c create mode 100644 kernel/gcov/gcc_base.c v2: - Reorganized config dependencies, as per Masahiro. v3: - Squashed patches 2-4 of v2, as per Nick, Masahiro, and Peter. Addressed comments by Peter: - Moved __gcov_exit() to gcc_base.c - Added missing header to gcc_base.c - Removed unnecessary boundary checks in gcov_info_add(). - Changed counters' allocation to use vmalloc(). - Added check for failed allocation of filename. - Changed list_for_each_entry_safe to list_for_each_entry when traversing without modifying. - Updated Documentation/dev-tools/gcov.rst v4: Made following changes to pass kernel module test cases suggested by Peter: - Generic code in base.c unlinks gcov_info data sets while iterating over the gcov_info list. Changed Clang's gcov_info_unlink() to preserve next and prev links of the unlinked gcov_info instance. - Attributing a given gcov_info to a module is done differently in Clang vs GCC. Generic code in base.c needs to do this. So added gcov_info_within_module() interface to gcov.h to abstract away the difference. - Clang provides checksums for each function. These checksums are used to determine whether the source files of the compiled kernel module have been modified. Changed gcov_info_is_compatible() to account for function-level checksums. Addressed comments by Peter: - Removed unnecessary #define, if-clause, empty line. - Amended commit message to note documentation was adjusted to account for the removal of config symbol CONFIG_GCOV_FORMAT_AUTODETECT. -- 2.21.0.225.g810b269d1ac-goog
