849d5f5929
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.
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* dwarf2ctf.h - DWARF interface for CTF/BTF generation.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* This file contains declarations and prototypes to define an interface
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between DWARF and CTF/BTF generation. */
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#ifndef GCC_DWARF2CTF_H
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#define GCC_DWARF2CTF_H 1
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#include "dwarf2out.h"
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#include "flags.h"
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/* Debug Format Interface. Used in dwarf2out.c. */
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extern void ctf_debug_init (void);
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extern void ctf_debug_init_postprocess (bool);
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extern bool ctf_do_die (dw_die_ref);
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extern void ctf_debug_early_finish (const char *);
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extern void ctf_debug_finish (const char *);
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/* Wrappers for CTF/BTF to fetch information from GCC DWARF DIE. Used in
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ctfc.c.
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A CTF container does not store all debug information internally. Some of
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the info is fetched indirectly via the DIE reference available in each CTF
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container entry.
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These functions will be used by the CTF container to give access to its
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consumers (CTF/BTF) to various debug information available in DWARF DIE.
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Direct access to debug information in GCC dwarf structures by the consumers
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of CTF/BTF information is not ideal. */
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/* Source location information. */
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extern const char * ctf_get_die_loc_file (dw_die_ref);
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extern unsigned int ctf_get_die_loc_line (dw_die_ref);
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extern unsigned int ctf_get_die_loc_col (dw_die_ref);
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#endif /* GCC_DWARF2CTF_H */
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