https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107844
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Cupertino Miranda <cuper...@gcc.gnu.org>: https://gcc.gnu.org/g:e0a81559c198153923f0a1a3be7c25df545f3964 commit r14-2962-ge0a81559c198153923f0a1a3be7c25df545f3964 Author: Cupertino Miranda <cupertino.mira...@oracle.com> Date: Thu Apr 6 15:22:48 2023 +0100 bpf: Implementation of BPF CO-RE builtins This patch updates the support for the BPF CO-RE builtins __builtin_preserve_access_index and __builtin_preserve_field_info, and adds support for the CO-RE builtins __builtin_btf_type_id, __builtin_preserve_type_info and __builtin_preserve_enum_value. These CO-RE relocations are now converted to __builtin_core_reloc which abstracts all of the original builtins in a polymorphic relocation specific builtin. The builtin processing is now split in 2 stages, the first (pack) is executed right after the front-end and the second (process) right before the asm output. In expand pass the __builtin_core_reloc is converted to a unspec:UNSPEC_CORE_RELOC rtx entry. The data required to process the builtin is now collected in the packing stage (after front-end), not allowing the compiler to optimize any of the relevant information required to compose the relocation when necessary. At expansion, that information is recovered and CTF/BTF is queried to construct the information that will be used in the relocation. At this point the relocation is added to specific section and the builtin is expanded to the expected default value for the builtin. In order to process __builtin_preserve_enum_value, it was necessary to hook the front-end to collect the original enum value reference. This is needed since the parser folds all the enum values to its integer_cst representation. More details can be found within the core-builtins.cc. Regtested in host x86_64-linux-gnu and target bpf-unknown-none. gcc/ChangeLog: PR target/107844 PR target/107479 PR target/107480 PR target/107481 * config.gcc: Added core-builtins.cc and .o files. * config/bpf/bpf-passes.def: Removed file. * config/bpf/bpf-protos.h (bpf_add_core_reloc, bpf_replace_core_move_operands): New prototypes. * config/bpf/bpf.cc (enum bpf_builtins, is_attr_preserve_access, maybe_make_core_relo, bpf_core_field_info, bpf_core_compute, bpf_core_get_index, bpf_core_new_decl, bpf_core_walk, bpf_is_valid_preserve_field_info_arg, is_attr_preserve_access, handle_attr_preserve, pass_data_bpf_core_attr, pass_bpf_core_attr): Removed. (def_builtin, bpf_expand_builtin, bpf_resolve_overloaded_builtin): Changed. * config/bpf/bpf.md (define_expand mov<MM:mode>): Changed. (mov_reloc_core<mode>): Added. * config/bpf/core-builtins.cc (struct cr_builtin, enum cr_decision struct cr_local, struct cr_final, struct core_builtin_helpers, enum bpf_plugin_states): Added types. (builtins_data, core_builtin_helpers, core_builtin_type_defs): Added variables. (allocate_builtin_data, get_builtin-data, search_builtin_data, remove_parser_plugin, compare_same_kind, compare_same_ptr_expr, compare_same_ptr_type, is_attr_preserve_access, core_field_info, bpf_core_get_index, compute_field_expr, pack_field_expr_for_access_index, pack_field_expr_for_preserve_field, process_field_expr, pack_enum_value, process_enum_value, pack_type, process_type, bpf_require_core_support, make_core_relo, read_kind, kind_access_index, kind_preserve_field_info, kind_enum_value, kind_type_id, kind_preserve_type_info, get_core_builtin_fndecl_for_type, bpf_handle_plugin_finish_type, bpf_init_core_builtins, construct_builtin_core_reloc, bpf_resolve_overloaded_core_builtin, bpf_expand_core_builtin, bpf_add_core_reloc, bpf_replace_core_move_operands): Added functions. * config/bpf/core-builtins.h (enum bpf_builtins): Added. (bpf_init_core_builtins, bpf_expand_core_builtin, bpf_resolve_overloaded_core_builtin): Added functions. * config/bpf/coreout.cc (struct bpf_core_extra): Added. (bpf_core_reloc_add, output_asm_btfext_core_reloc): Changed. * config/bpf/coreout.h (bpf_core_reloc_add) Changed prototype. * config/bpf/t-bpf: Added core-builtins.o. * doc/extend.texi: Added documentation for new BPF builtins.
