forked from Imagelibrary/binutils-gdb
7b80401da0
DWARF 5 standardized the .gnu_debugaltlink section that dwz emits in multi-file mode. This is handled via some new forms, and a new .debug_sup section. This patch adds support for this to gdb. It is largely straightforward, I think, though one oddity is that I chose not to have this code search the system build-id directories for the supplementary file. My feeling was that, while it makes sense for a distro to unify the build-id concept with the hash stored in the .debug_sup section, there's no intrinsic need to do so. This in turn means that a few tests -- for example those that test the index cache -- will not work in this mode. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32808 Acked-By: Simon Marchi <simon.marchi@efficios.com>
81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
/* DWARF DWZ handling for GDB.
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Copyright (C) 2003-2025 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDB_DWARF2_DWZ_H
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#define GDB_DWARF2_DWZ_H
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#include "gdb_bfd.h"
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#include "dwarf2/index-cache.h"
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#include "dwarf2/section.h"
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struct dwarf2_per_bfd;
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struct dwarf2_per_objfile;
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/* This represents a '.dwz' file. */
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struct dwz_file
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{
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/* Open the separate '.dwz' debug file, if needed. This will set
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the appropriate field in the per-BFD structure. If the DWZ file
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exists, the relevant sections are read in as well. Throws an
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exception if the .gnu_debugaltlink or .debug_sup section exists
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but is invalid or if the file cannot be found. */
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static void read_dwz_file (dwarf2_per_objfile *per_objfile);
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const char *filename () const
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{
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return bfd_get_filename (this->dwz_bfd.get ());
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}
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/* A dwz file can only contain a few sections. */
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struct dwarf2_section_info abbrev {};
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struct dwarf2_section_info info {};
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struct dwarf2_section_info str {};
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struct dwarf2_section_info line {};
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struct dwarf2_section_info macro {};
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struct dwarf2_section_info gdb_index {};
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struct dwarf2_section_info debug_names {};
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struct dwarf2_section_info types {};
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/* The dwz's BFD. */
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gdb_bfd_ref_ptr dwz_bfd;
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/* If we loaded the index from an external file, this contains the
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resources associated to the open file, memory mapping, etc. */
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index_cache_resource_up index_cache_res;
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/* Read a string at offset STR_OFFSET in the .debug_str section from
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this dwz file. Throw an error if the offset is too large. If
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the string consists of a single NUL byte, return NULL; otherwise
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return a pointer to the string. */
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const char *read_string (struct objfile *objfile, LONGEST str_offset);
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private:
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explicit dwz_file (gdb_bfd_ref_ptr &&bfd)
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: dwz_bfd (std::move (bfd))
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{
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}
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};
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using dwz_file_up = std::unique_ptr<dwz_file>;
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#endif /* GDB_DWARF2_DWZ_H */
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