28c32713ac
* symfile.c (symfile_map_offsets_to_segments): Doc fixes. Assert that we were passed some loaded segment addresses, and that sections' segment numbers are valid. Simplify offset calculation. * remote.c (get_offsets): Clarify selection of relocate-by-segment strategy, and set num_segments correctly. Delete redundant assignments to do_sections.
386 lines
13 KiB
C
386 lines
13 KiB
C
/* Definitions for reading symbol files into GDB.
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Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
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2000, 2001, 2002, 2003, 2004, 2007 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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/* Opaque declarations. */
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struct section_table;
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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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/* Partial symbols are stored in the psymbol_cache and pointers to
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them are kept in a dynamically grown array that is obtained from
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malloc and grown as necessary via realloc. Each objfile typically
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has two of these, one for global symbols and one for static
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symbols. Although this adds a level of indirection for storing or
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accessing the partial symbols, it allows us to throw away duplicate
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psymbols and set all pointers to the single saved instance. */
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struct psymbol_allocation_list
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{
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/* Pointer to beginning of dynamically allocated array of pointers
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to partial symbols. The array is dynamically expanded as
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necessary to accommodate more pointers. */
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struct partial_symbol **list;
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/* Pointer to next available slot in which to store a pointer to a
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partial symbol. */
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struct partial_symbol **next;
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/* Number of allocated pointer slots in current dynamic array (not
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the number of bytes of storage). The "next" pointer will always
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point somewhere between list[0] and list[size], and when at
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list[size] the array will be expanded on the next attempt to
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store a pointer. */
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int size;
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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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struct section_addr_info
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{
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/* The number of sections for which address information is
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available. */
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size_t num_sections;
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/* Sections whose names are file format dependent. */
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struct other_sections
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{
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CORE_ADDR addr;
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char *name;
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int sectindex;
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} other[1];
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};
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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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/* 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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/* BFD flavour that we handle, or (as a special kludge, see
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xcoffread.c, (enum bfd_flavour)-1 for xcoff). */
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enum bfd_flavour sym_flavour;
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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, mainline) 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. MAINLINE is 1 if this is the main symbol
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table being read, and 0 if a secondary symbol file (e.g. shared
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library or dynamically loaded file) is being read. */
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void (*sym_read) (struct objfile *, int);
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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, and based on the
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parameter. The parameter is currently a CORE_ADDR (FIXME!) for
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backward compatibility with the higher levels of GDB. It should
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probably be changed to a string, where NULL means the default,
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and others are parsed in a file dependent way. */
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void (*sym_offsets) (struct objfile *, struct 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) (void);
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/* Finds the next struct sym_fns. They are allocated and
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initialized in whatever module implements the functions pointed
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to; an initializer calls add_symtab_fns to add them to the global
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chain. */
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struct sym_fns *next;
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};
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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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struct 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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extern void extend_psymbol_list (struct psymbol_allocation_list *,
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struct objfile *);
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/* Add any kind of symbol to a psymbol_allocation_list. */
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/* #include "demangle.h" */
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extern const
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struct partial_symbol *add_psymbol_to_list (char *, int, domain_enum,
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enum address_class,
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struct psymbol_allocation_list *,
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long, CORE_ADDR,
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enum language, struct objfile *);
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extern void init_psymbol_list (struct objfile *, int);
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extern void sort_pst_symbols (struct partial_symtab *);
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extern struct symtab *allocate_symtab (char *, struct objfile *);
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extern int free_named_symtabs (char *);
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extern void fill_in_vptr_fieldno (struct type *);
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extern void add_symtab_fns (struct sym_fns *);
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extern void syms_from_objfile (struct objfile *,
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struct section_addr_info *,
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struct section_offsets *, int, int, int);
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extern void new_symfile_objfile (struct objfile *, int, int);
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extern struct objfile *symbol_file_add (char *, int,
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struct section_addr_info *, int, int);
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extern struct objfile *symbol_file_add_from_bfd (bfd *, int,
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struct section_addr_info *,
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int, int);
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/* Create a new section_addr_info, with room for NUM_SECTIONS. */
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extern struct section_addr_info *alloc_section_addr_info (size_t
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num_sections);
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/* Return a freshly allocated copy of ADDRS. The section names, if
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any, are also freshly allocated copies of those in ADDRS. */
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extern struct section_addr_info *(copy_section_addr_info
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(struct section_addr_info *addrs));
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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 struct section_addr_info
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*build_section_addr_info_from_section_table (const struct section_table
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*start,
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const struct section_table
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*end);
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/* Free all memory allocated by
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build_section_addr_info_from_section_table. */
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extern void free_section_addr_info (struct section_addr_info *);
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extern struct partial_symtab *start_psymtab_common (struct objfile *,
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struct section_offsets *,
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char *, CORE_ADDR,
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struct partial_symbol **,
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struct partial_symbol **);
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/* Make a copy of the string at PTR with SIZE characters in the symbol
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obstack (and add a null character at the end in the copy). Returns
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the address of the copy. */
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extern char *obsavestring (const char *, int, struct obstack *);
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/* Concatenate strings S1, S2 and S3; return the new string. Space is
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found in the OBSTACKP */
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extern char *obconcat (struct obstack *obstackp, const char *, const char *,
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const char *);
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/* Variables */
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/* If non-zero, 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 int auto_solib_add;
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/* For systems that support it, a threshold size in megabytes. If
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automatically adding a new library's symbol table to those already
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known to the debugger would cause the total shared library symbol
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size to exceed this threshhold, then the shlib's symbols are not
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added. The threshold is ignored if the user explicitly asks for a
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shlib to be added, such as when using the "sharedlibrary" command. */
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extern int auto_solib_limit;
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/* From symfile.c */
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extern struct partial_symtab *allocate_psymtab (char *, struct objfile *);
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extern void discard_psymtab (struct partial_symtab *);
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extern void find_lowest_section (bfd *, asection *, void *);
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extern bfd *symfile_bfd_open (char *);
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extern int get_section_index (struct objfile *, char *);
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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 asection *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 asection *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 (asection *);
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/* Return true if the overlay section is currently "mapped". */
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extern int section_is_mapped (asection *);
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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, asection *);
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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, asection *);
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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, asection *);
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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, asection *);
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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, asection *);
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/* Load symbols from a file. */
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extern void symbol_file_add_main (char *args, int from_tty);
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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 (bfd *abfd, asection *sectp,
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bfd_byte * buf);
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extern int symfile_map_offsets_to_segments (bfd *,
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struct symfile_segment_data *,
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struct 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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/* From dwarf2read.c */
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extern int dwarf2_has_info (struct objfile *);
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extern void dwarf2_build_psymtabs (struct objfile *, int);
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extern void dwarf2_build_frame_info (struct objfile *);
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/* From mdebugread.c */
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/* Hack to force structures to exist before use in parameter list. */
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struct ecoff_debug_hack
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{
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struct ecoff_debug_swap *a;
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struct ecoff_debug_info *b;
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};
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extern void mdebug_build_psymtabs (struct objfile *,
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const struct ecoff_debug_swap *,
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struct ecoff_debug_info *);
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extern void elfmdebug_build_psymtabs (struct objfile *,
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const struct ecoff_debug_swap *,
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asection *);
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#endif /* !defined(SYMFILE_H) */
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