18a8505e38
* Process debug_str_offsets section. Handle DW_AT_str_offsets_base attribute and keep the value in dwarf2_cu. * Make addr_base field in dwarf2_cu optional to disambiguate 0 value (absent or present and 0). * During parsing, there is no guarantee that DW_AT_str_offsets_base and DW_AT_rnglists_base fields will be processed before the attributes that need those values for correct computation. So make two passes, on the first one mark the attributes that depend on *_base attributes and process only the others. On the second pass, only process the attributes that are marked on the first pass. * For string attributes, differentiate between addresses that directly point to a string and those that point to an offset in debug_str_offsets section. * There are now two attributes, DW_AT_addr_base and DW_AT_GNU_addr_base to read address offset base. Likewise, there are two attributes, DW_AT_rnglists_base and DW_AT_GNU_ranges_base to read ranges base. Since there is no guarantee which ones the compiler will generate, create helper functions to handle all cases. Tested with CC=/usr/bin/gcc (version 8.3.0) against master branch (also with -gsplit-dwarf and -gdwarf-4 flags) and there was no increase in the set of tests that fails. (gdb still cannot debug a 'hello world' program with DWARF 5, so for the time being, this is all we care about). This is part of an effort to support DWARF-5 in gdb.
632 lines
23 KiB
C++
632 lines
23 KiB
C++
/* Definitions for reading symbol files into GDB.
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Copyright (C) 1990-2020 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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#if !defined (SYMFILE_H)
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#define SYMFILE_H
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/* This file requires that you first include "bfd.h". */
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#include "symtab.h"
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#include "probe.h"
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#include "symfile-add-flags.h"
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#include "objfile-flags.h"
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#include "gdb_bfd.h"
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#include "gdbsupport/function-view.h"
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/* Opaque declarations. */
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struct target_section;
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struct objfile;
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struct obj_section;
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struct obstack;
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struct block;
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struct value;
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struct frame_info;
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struct agent_expr;
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struct axs_value;
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class probe;
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/* Comparison function for symbol look ups. */
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typedef int (symbol_compare_ftype) (const char *string1,
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const char *string2);
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struct other_sections
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{
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other_sections (CORE_ADDR addr_, std::string &&name_, int sectindex_)
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: addr (addr_),
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name (std::move (name_)),
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sectindex (sectindex_)
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{
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}
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other_sections (other_sections &&other) = default;
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DISABLE_COPY_AND_ASSIGN (other_sections);
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CORE_ADDR addr;
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std::string name;
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/* SECTINDEX must be valid for associated BFD or set to -1.
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See syms_from_objfile_1 for an exception to this rule.
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*/
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int sectindex;
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};
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/* Define an array of addresses to accommodate non-contiguous dynamic
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loading of modules. This is for use when entering commands, so we
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can keep track of the section names until we read the file and can
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map them to bfd sections. This structure is also used by solib.c
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to communicate the section addresses in shared objects to
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symbol_file_add (). */
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typedef std::vector<other_sections> section_addr_info;
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/* A table listing the load segments in a symfile, and which segment
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each BFD section belongs to. */
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struct symfile_segment_data
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{
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/* How many segments are present in this file. If there are
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two, the text segment is the first one and the data segment
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is the second one. */
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int num_segments;
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/* If NUM_SEGMENTS is greater than zero, the original base address
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of each segment. */
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CORE_ADDR *segment_bases;
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/* If NUM_SEGMENTS is greater than zero, the memory size of each
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segment. */
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CORE_ADDR *segment_sizes;
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/* If NUM_SEGMENTS is greater than zero, this is an array of entries
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recording which segment contains each BFD section.
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SEGMENT_INFO[I] is S+1 if the I'th BFD section belongs to segment
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S, or zero if it is not in any segment. */
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int *segment_info;
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};
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/* Callback for quick_symbol_functions->map_symbol_filenames. */
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typedef void (symbol_filename_ftype) (const char *filename,
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const char *fullname, void *data);
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/* Callback for quick_symbol_functions->expand_symtabs_matching
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to match a file name. */
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typedef bool (expand_symtabs_file_matcher_ftype) (const char *filename,
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bool basenames);
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/* Callback for quick_symbol_functions->expand_symtabs_matching
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to match a symbol name. */
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typedef bool (expand_symtabs_symbol_matcher_ftype) (const char *name);
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/* Callback for quick_symbol_functions->expand_symtabs_matching
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to be called after a symtab has been expanded. */
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typedef void (expand_symtabs_exp_notify_ftype) (compunit_symtab *symtab);
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/* The "quick" symbol functions exist so that symbol readers can
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avoiding an initial read of all the symbols. For example, symbol
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readers might choose to use the "partial symbol table" utilities,
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which is one implementation of the quick symbol functions.
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The quick symbol functions are generally opaque: the underlying
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representation is hidden from the caller.
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In general, these functions should only look at whatever special
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index the symbol reader creates -- looking through the symbol
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tables themselves is handled by generic code. If a function is
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defined as returning a "symbol table", this means that the function
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should only return a newly-created symbol table; it should not
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examine pre-existing ones.
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The exact list of functions here was determined in an ad hoc way
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based on gdb's history. */
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struct quick_symbol_functions
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{
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/* Return true if this objfile has any "partial" symbols
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available. */
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int (*has_symbols) (struct objfile *objfile);
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/* Return the symbol table for the "last" file appearing in
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OBJFILE. */
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struct symtab *(*find_last_source_symtab) (struct objfile *objfile);
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/* Forget all cached full file names for OBJFILE. */
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void (*forget_cached_source_info) (struct objfile *objfile);
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/* Expand and iterate over each "partial" symbol table in OBJFILE
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where the source file is named NAME.
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If NAME is not absolute, a match after a '/' in the symbol table's
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file name will also work, REAL_PATH is NULL then. If NAME is
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absolute then REAL_PATH is non-NULL absolute file name as resolved
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via gdb_realpath from NAME.
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If a match is found, the "partial" symbol table is expanded.
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Then, this calls iterate_over_some_symtabs (or equivalent) over
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all newly-created symbol tables, passing CALLBACK to it.
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The result of this call is returned. */
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bool (*map_symtabs_matching_filename)
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(struct objfile *objfile, const char *name, const char *real_path,
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gdb::function_view<bool (symtab *)> callback);
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/* Check to see if the symbol is defined in a "partial" symbol table
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of OBJFILE. BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
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depending on whether we want to search global symbols or static
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symbols. NAME is the name of the symbol to look for. DOMAIN
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indicates what sort of symbol to search for.
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Returns the newly-expanded compunit in which the symbol is
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defined, or NULL if no such symbol table exists. If OBJFILE
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contains !TYPE_OPAQUE symbol prefer its compunit. If it contains
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only TYPE_OPAQUE symbol(s), return at least that compunit. */
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struct compunit_symtab *(*lookup_symbol) (struct objfile *objfile,
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block_enum block_index,
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const char *name,
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domain_enum domain);
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/* Print statistics about any indices loaded for OBJFILE. The
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statistics should be printed to gdb_stdout. This is used for
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"maint print statistics". */
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void (*print_stats) (struct objfile *objfile);
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/* Dump any indices loaded for OBJFILE. The dump should go to
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gdb_stdout. This is used for "maint print objfiles". */
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void (*dump) (struct objfile *objfile);
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/* Find all the symbols in OBJFILE named FUNC_NAME, and ensure that
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the corresponding symbol tables are loaded. */
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void (*expand_symtabs_for_function) (struct objfile *objfile,
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const char *func_name);
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/* Read all symbol tables associated with OBJFILE. */
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void (*expand_all_symtabs) (struct objfile *objfile);
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/* Read all symbol tables associated with OBJFILE which have
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symtab_to_fullname equal to FULLNAME.
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This is for the purposes of examining code only, e.g., expand_line_sal.
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The routine may ignore debug info that is known to not be useful with
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code, e.g., DW_TAG_type_unit for dwarf debug info. */
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void (*expand_symtabs_with_fullname) (struct objfile *objfile,
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const char *fullname);
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/* Find global or static symbols in all tables that are in DOMAIN
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and for which MATCH (symbol name, NAME) == 0, passing each to
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CALLBACK, reading in partial symbol tables as needed. Look
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through global symbols if GLOBAL and otherwise static symbols.
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Passes NAME and NAMESPACE to CALLBACK with each symbol
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found. After each block is processed, passes NULL to CALLBACK.
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MATCH must be weaker than strcmp_iw_ordered in the sense that
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strcmp_iw_ordered(x,y) == 0 --> MATCH(x,y) == 0. ORDERED_COMPARE,
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if non-null, must be an ordering relation compatible with
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strcmp_iw_ordered in the sense that
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strcmp_iw_ordered(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
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and
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strcmp_iw_ordered(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
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(allowing strcmp_iw_ordered(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
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CALLBACK returns true to indicate that the scan should continue, or
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false to indicate that the scan should be terminated. */
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void (*map_matching_symbols)
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(struct objfile *,
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const lookup_name_info &lookup_name,
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domain_enum domain,
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int global,
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gdb::function_view<symbol_found_callback_ftype> callback,
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symbol_compare_ftype *ordered_compare);
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/* Expand all symbol tables in OBJFILE matching some criteria.
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FILE_MATCHER is called for each file in OBJFILE. The file name
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is passed to it. If the matcher returns false, the file is
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skipped. If FILE_MATCHER is NULL the file is not skipped. If
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BASENAMES is true the matcher should consider only file base
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names (the passed file name is already only the lbasename'd
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part).
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Otherwise, if KIND does not match, this symbol is skipped.
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If even KIND matches, SYMBOL_MATCHER is called for each symbol
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defined in the file. The symbol "search" name is passed to
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SYMBOL_MATCHER.
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If SYMBOL_MATCHER returns false, then the symbol is skipped.
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Otherwise, the symbol's symbol table is expanded. */
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void (*expand_symtabs_matching)
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(struct objfile *objfile,
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gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
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const lookup_name_info &lookup_name,
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gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
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gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
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enum search_domain kind);
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/* Return the comp unit from OBJFILE that contains PC and
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SECTION. Return NULL if there is no such compunit. This
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should return the compunit that contains a symbol whose
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address exactly matches PC, or, if there is no exact match, the
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compunit that contains a symbol whose address is closest to
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PC. */
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struct compunit_symtab *(*find_pc_sect_compunit_symtab)
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(struct objfile *objfile, struct bound_minimal_symbol msymbol,
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CORE_ADDR pc, struct obj_section *section, int warn_if_readin);
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/* Return the comp unit from OBJFILE that contains a symbol at
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ADDRESS. Return NULL if there is no such comp unit. Unlike
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find_pc_sect_compunit_symtab, any sort of symbol (not just text
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symbols) can be considered, and only exact address matches are
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considered. This pointer may be NULL. */
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struct compunit_symtab *(*find_compunit_symtab_by_address)
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(struct objfile *objfile, CORE_ADDR address);
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/* Call a callback for every file defined in OBJFILE whose symtab is
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not already read in. FUN is the callback. It is passed the file's
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FILENAME, the file's FULLNAME (if need_fullname is non-zero), and
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the DATA passed to this function. */
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void (*map_symbol_filenames) (struct objfile *objfile,
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symbol_filename_ftype *fun, void *data,
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int need_fullname);
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};
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/* Structure of functions used for probe support. If one of these functions
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is provided, all must be. */
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struct sym_probe_fns
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{
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/* If non-NULL, return a reference to vector of probe objects. */
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const std::vector<std::unique_ptr<probe>> &(*sym_get_probes)
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(struct objfile *);
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};
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/* Structure to keep track of symbol reading functions for various
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object file types. */
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struct sym_fns
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{
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/* Initializes anything that is global to the entire symbol table.
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It is called during symbol_file_add, when we begin debugging an
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entirely new program. */
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void (*sym_new_init) (struct objfile *);
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/* Reads any initial information from a symbol file, and initializes
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the struct sym_fns SF in preparation for sym_read(). It is
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called every time we read a symbol file for any reason. */
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void (*sym_init) (struct objfile *);
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/* sym_read (objfile, symfile_flags) Reads a symbol file into a psymtab
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(or possibly a symtab). OBJFILE is the objfile struct for the
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file we are reading. SYMFILE_FLAGS are the flags passed to
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symbol_file_add & co. */
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void (*sym_read) (struct objfile *, symfile_add_flags);
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/* Read the partial symbols for an objfile. This may be NULL, in which case
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gdb has to check other ways if this objfile has any symbols. This may
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only be non-NULL if the objfile actually does have debuginfo available.
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*/
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void (*sym_read_psymbols) (struct objfile *);
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/* Called when we are finished with an objfile. Should do all
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cleanup that is specific to the object file format for the
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particular objfile. */
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void (*sym_finish) (struct objfile *);
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/* This function produces a file-dependent section_offsets
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structure, allocated in the objfile's storage.
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The section_addr_info structure contains the offset of loadable and
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allocated sections, relative to the absolute offsets found in the BFD. */
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void (*sym_offsets) (struct objfile *, const section_addr_info &);
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/* This function produces a format-independent description of
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the segments of ABFD. Each segment is a unit of the file
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which may be relocated independently. */
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struct symfile_segment_data *(*sym_segments) (bfd *abfd);
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/* This function should read the linetable from the objfile when
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the line table cannot be read while processing the debugging
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information. */
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void (*sym_read_linetable) (struct objfile *);
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/* Relocate the contents of a debug section SECTP. The
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contents are stored in BUF if it is non-NULL, or returned in a
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malloc'd buffer otherwise. */
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bfd_byte *(*sym_relocate) (struct objfile *, asection *sectp, bfd_byte *buf);
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/* If non-NULL, this objfile has probe support, and all the probe
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functions referred to here will be non-NULL. */
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const struct sym_probe_fns *sym_probe_fns;
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/* The "quick" (aka partial) symbol functions for this symbol
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reader. */
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const struct quick_symbol_functions *qf;
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};
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extern section_addr_info
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build_section_addr_info_from_objfile (const struct objfile *objfile);
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extern void relative_addr_info_to_section_offsets
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(section_offsets §ion_offsets, const section_addr_info &addrs);
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extern void addr_info_make_relative (section_addr_info *addrs,
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bfd *abfd);
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/* The default version of sym_fns.sym_offsets for readers that don't
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do anything special. */
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extern void default_symfile_offsets (struct objfile *objfile,
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const section_addr_info &);
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/* The default version of sym_fns.sym_segments for readers that don't
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do anything special. */
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extern struct symfile_segment_data *default_symfile_segments (bfd *abfd);
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/* The default version of sym_fns.sym_relocate for readers that don't
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do anything special. */
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extern bfd_byte *default_symfile_relocate (struct objfile *objfile,
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asection *sectp, bfd_byte *buf);
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extern struct symtab *allocate_symtab (struct compunit_symtab *, const char *)
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ATTRIBUTE_NONNULL (1);
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extern struct compunit_symtab *allocate_compunit_symtab (struct objfile *,
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const char *)
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ATTRIBUTE_NONNULL (1);
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extern void add_compunit_symtab_to_objfile (struct compunit_symtab *cu);
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extern void add_symtab_fns (enum bfd_flavour flavour, const struct sym_fns *);
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extern void clear_symtab_users (symfile_add_flags add_flags);
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extern enum language deduce_language_from_filename (const char *);
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/* Map the filename extension EXT to the language LANG. Any previous
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association of EXT will be removed. EXT will be copied by this
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function. */
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extern void add_filename_language (const char *ext, enum language lang);
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extern struct objfile *symbol_file_add (const char *, symfile_add_flags,
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section_addr_info *, objfile_flags);
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extern struct objfile *symbol_file_add_from_bfd (bfd *, const char *, symfile_add_flags,
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section_addr_info *,
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objfile_flags, struct objfile *parent);
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extern void symbol_file_add_separate (bfd *, const char *, symfile_add_flags,
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struct objfile *);
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extern std::string find_separate_debug_file_by_debuglink (struct objfile *);
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/* Build (allocate and populate) a section_addr_info struct from an
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existing section table. */
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extern section_addr_info
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build_section_addr_info_from_section_table (const struct target_section
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*start,
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const struct target_section
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*end);
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/* Variables */
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/* If true, shared library symbols will be added automatically
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when the inferior is created, new libraries are loaded, or when
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attaching to the inferior. This is almost always what users will
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want to have happen; but for very large programs, the startup time
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will be excessive, and so if this is a problem, the user can clear
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this flag and then add the shared library symbols as needed. Note
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that there is a potential for confusion, since if the shared
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library symbols are not loaded, commands like "info fun" will *not*
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report all the functions that are actually present. */
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extern bool auto_solib_add;
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/* From symfile.c */
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extern void set_initial_language (void);
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extern void find_lowest_section (bfd *, asection *, void *);
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extern gdb_bfd_ref_ptr symfile_bfd_open (const char *);
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extern int get_section_index (struct objfile *, const char *);
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extern int print_symbol_loading_p (int from_tty, int mainline, int full);
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/* Utility functions for overlay sections: */
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extern enum overlay_debugging_state
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{
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ovly_off,
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ovly_on,
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ovly_auto
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} overlay_debugging;
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extern int overlay_cache_invalid;
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/* Return the "mapped" overlay section containing the PC. */
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extern struct obj_section *find_pc_mapped_section (CORE_ADDR);
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/* Return any overlay section containing the PC (even in its LMA
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region). */
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extern struct obj_section *find_pc_overlay (CORE_ADDR);
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/* Return true if the section is an overlay. */
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extern int section_is_overlay (struct obj_section *);
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/* Return true if the overlay section is currently "mapped". */
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extern int section_is_mapped (struct obj_section *);
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/* Return true if pc belongs to section's VMA. */
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extern CORE_ADDR pc_in_mapped_range (CORE_ADDR, struct obj_section *);
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/* Return true if pc belongs to section's LMA. */
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extern CORE_ADDR pc_in_unmapped_range (CORE_ADDR, struct obj_section *);
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/* Map an address from a section's LMA to its VMA. */
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extern CORE_ADDR overlay_mapped_address (CORE_ADDR, struct obj_section *);
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/* Map an address from a section's VMA to its LMA. */
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extern CORE_ADDR overlay_unmapped_address (CORE_ADDR, struct obj_section *);
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/* Convert an address in an overlay section (force into VMA range). */
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extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
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/* Load symbols from a file. */
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extern void symbol_file_add_main (const char *args,
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symfile_add_flags add_flags);
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/* Clear GDB symbol tables. */
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extern void symbol_file_clear (int from_tty);
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/* Default overlay update function. */
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extern void simple_overlay_update (struct obj_section *);
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extern bfd_byte *symfile_relocate_debug_section (struct objfile *, asection *,
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bfd_byte *);
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extern int symfile_map_offsets_to_segments (bfd *,
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const struct symfile_segment_data *,
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section_offsets &,
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int, const CORE_ADDR *);
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struct symfile_segment_data *get_symfile_segment_data (bfd *abfd);
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void free_symfile_segment_data (struct symfile_segment_data *data);
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extern scoped_restore_tmpl<int> increment_reading_symtab (void);
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void expand_symtabs_matching
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(gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
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const lookup_name_info &lookup_name,
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gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
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gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
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enum search_domain kind);
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void map_symbol_filenames (symbol_filename_ftype *fun, void *data,
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int need_fullname);
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/* Target-agnostic function to load the sections of an executable into memory.
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ARGS should be in the form "EXECUTABLE [OFFSET]", where OFFSET is an
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optional offset to apply to each section. */
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extern void generic_load (const char *args, int from_tty);
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/* From dwarf2read.c */
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/* Names for a dwarf2 debugging section. The field NORMAL is the normal
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section name (usually from the DWARF standard), while the field COMPRESSED
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is the name of compressed sections. If your object file format doesn't
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support compressed sections, the field COMPRESSED can be NULL. Likewise,
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the debugging section is not supported, the field NORMAL can be NULL too.
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It doesn't make sense to have a NULL NORMAL field but a non-NULL COMPRESSED
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field. */
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struct dwarf2_section_names {
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const char *normal;
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const char *compressed;
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};
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/* List of names for dward2 debugging sections. Also most object file formats
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use the standardized (ie ELF) names, some (eg XCOFF) have customized names
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due to restrictions.
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The table for the standard names is defined in dwarf2read.c. Please
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update all instances of dwarf2_debug_sections if you add a field to this
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structure. It is always safe to use { NULL, NULL } in this case. */
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struct dwarf2_debug_sections {
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struct dwarf2_section_names info;
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struct dwarf2_section_names abbrev;
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struct dwarf2_section_names line;
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struct dwarf2_section_names loc;
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struct dwarf2_section_names loclists;
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struct dwarf2_section_names macinfo;
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struct dwarf2_section_names macro;
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struct dwarf2_section_names str;
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struct dwarf2_section_names str_offsets;
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struct dwarf2_section_names line_str;
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struct dwarf2_section_names ranges;
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struct dwarf2_section_names rnglists;
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struct dwarf2_section_names types;
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struct dwarf2_section_names addr;
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struct dwarf2_section_names frame;
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struct dwarf2_section_names eh_frame;
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struct dwarf2_section_names gdb_index;
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struct dwarf2_section_names debug_names;
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struct dwarf2_section_names debug_aranges;
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/* This field has no meaning, but exists solely to catch changes to
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this structure which are not reflected in some instance. */
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int sentinel;
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};
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extern int dwarf2_has_info (struct objfile *,
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const struct dwarf2_debug_sections *,
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bool = false);
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/* Dwarf2 sections that can be accessed by dwarf2_get_section_info. */
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enum dwarf2_section_enum {
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DWARF2_DEBUG_FRAME,
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DWARF2_EH_FRAME
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};
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extern void dwarf2_get_section_info (struct objfile *,
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enum dwarf2_section_enum,
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asection **, const gdb_byte **,
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bfd_size_type *);
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/* A DWARF names index variant. */
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enum class dw_index_kind
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{
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/* GDB's own .gdb_index format. */
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GDB_INDEX,
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/* DWARF5 .debug_names. */
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DEBUG_NAMES,
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};
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/* Initialize for reading DWARF for OBJFILE. Return false if this
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file will use psymtabs, or true if using an index, in which case
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*INDEX_KIND is set to the index variant in use. */
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extern bool dwarf2_initialize_objfile (struct objfile *objfile,
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dw_index_kind *index_kind);
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extern void dwarf2_build_psymtabs (struct objfile *);
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extern void dwarf2_build_frame_info (struct objfile *);
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void dwarf2_free_objfile (struct objfile *);
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/* From minidebug.c. */
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extern gdb_bfd_ref_ptr find_separate_debug_file_in_section (struct objfile *);
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/* True if we are printing debug output about separate debug info files. */
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extern bool separate_debug_file_debug;
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#endif /* !defined(SYMFILE_H) */
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