riscv-gnu-toolchain/gcc.git - Unnamed repository; edit this file 'description' to name the repository.

Age	Commit message (Collapse)	Author	Files	Lines
2021-09-07	dwarf2out: Emit BTF in dwarf2out_finish for BPF CO-RE usecase	Indu Bhagat	1	-1/+3
	DWARF generation is split between early and late phases when LTO is in effect. This poses challenges for CTF/BTF generation especially if late debug info generation is desirable, as turns out to be the case for BPF CO-RE. The approach taken here in this patch is: 1. LTO is disabled for BPF CO-RE The reason to disable LTO for BPF CO-RE is that if LTO is in effect, BPF CO-RE relocations need to be generated in the LTO link phase _after_ the optimizations are done. This means we need to devise way to combine early and late BTF. At this time, in absence of linker support for BTF sections, it makes sense to steer clear of LTO for BPF CO-RE and bypass the issue. 2. The BPF backend updates the write_symbols with BPF_WITH_CORE_DEBUG to convey the case that BTF with CO-RE support needs to be generated. This information is used by the debug info emission routines to defer the emission of BTF/CO-RE until dwarf2out_finish. So, in other words, dwarf2out_early_finish - Always emit CTF here. - if (BTF && !BTF_WITH_CORE), emit BTF now. dwarf2out_finish - if (BTF_WITH_CORE) emit BTF now. gcc/ChangeLog: * dwarf2ctf.c (ctf_debug_finalize): Make it static. (ctf_debug_early_finish): New definition. (ctf_debug_finish): Likewise. * dwarf2ctf.h (ctf_debug_finalize): Remove declaration. (ctf_debug_early_finish): New declaration. (ctf_debug_finish): Likewise. * dwarf2out.c (dwarf2out_finish): Invoke ctf_debug_finish. (dwarf2out_early_finish): Invoke ctf_debug_early_finish.
2021-06-28	CTF/BTF debug formats	Indu Bhagat	1	-0/+53
	This commit introduces support for generating CTF debugging information and BTF debugging information from GCC. 2021-06-28 Indu Bhagat <indu.bhagat@oracle.com> David Faust <david.faust@oracle.com> Jose E. Marchesi <jose.marchesi@oracle.com> Weimin Pan <weimin.pan@oracle.com> gcc/ * Makefile.in: Add ctfc., ctfout.c and btfout.c files to GTFILES. Add new object files. common.opt: Add CTF and BTF debug info options. * btfout.c: New file. * ctfc.c: Likewise. * ctfc.h: Likewise. * ctfout.c: Likewise. * dwarf2ctf.c: Likewise. * dwarf2ctf.h: Likewise. * dwarf2cfi.c (dwarf2out_do_frame): Acknowledge CTF_DEBUG and BTF_DEBUG. * dwarf2out.c (dwarf2out_source_line): Likewise. (dwarf2out_finish): Skip emitting DWARF if CTF or BTF are to be generated. (debug_format_do_cu): New function. (dwarf2out_early_finish): Traverse DIEs and emit CTF/BTF for them if requested. Include dwarf2ctf.c. * final.c (dwarf2_debug_info_emitted_p): Acknowledge DWARF-based debug formats. * flag-types.h (enum debug_info_type): Add CTF_DEBUG and BTF_DEBUG. (CTF_DEBUG): New bitmask. (BTF_DEBUG): Likewise. (enum ctf_debug_info_levels): New enum. * gengtype.c (open_base_files): Handle ctfc.h. (main): Handle uint32_t type. * flags.h (btf_debuginfo_p): New definition. (dwarf_based_debuginfo_p): Likewise. * opts.c (debug_type_names): Add entries for CTF and BTF. (btf_debuginfo_p): New function. (dwarf_based_debuginfo_p): Likewise. (common_handle_option): Handle -gctfN and -gbtf options. (set_debug_level): Set CTF_DEBUG, BTF_DEBUG whenever appropriate. * toplev.c (process_options): Inform the user and ignore -gctfLEVEL if frontend is not C. include/ * ctf.h: New file. * btf.h: Likewise. libiberty/ * simple-object.c (handle_lto_debug_sections): Copy over .ctf sections.