3e03848b6c
* elfread.c (elf_symfile_read): Protect dwarf2_initialize_objfile by !objfile_has_partial_symbols. New comment. * objfiles.c (objfile_has_partial_symbols): Call HAS_SYMBOLS if SYM_READ_PSYMBOLS is not present. Extend the comment. * symfile.h (struct sym_fns): Extend the sym_read_psymbols comment. gdb/testsuite/ * gdb.base/gdbindex-stabs-dwarf.c: New file. * gdb.base/gdbindex-stabs.c: New file. * gdb.base/gdbindex-stabs.exp: New file.
582 lines
21 KiB
C
582 lines
21 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, 2008, 2009, 2010, 2011
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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 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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/* 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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/* 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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/* SECTINDEX must be valid for associated BFD if ADDR is not zero. */
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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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/* 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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/* Look up the symbol table, in OBJFILE, of a source file named
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NAME. If there is no '/' in the name, a match after a '/' in the
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symbol table's file name will also work. FULL_PATH is the
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absolute file name, and REAL_PATH is the same, run through
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gdb_realpath.
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If no such symbol table can be found, returns 0.
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Otherwise, sets *RESULT to the symbol table and returns 1. This
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might return 1 and set *RESULT to NULL if the requested file is
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an include file that does not have a symtab of its own. */
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int (*lookup_symtab) (struct objfile *objfile,
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const char *name,
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const char *full_path,
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const char *real_path,
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struct symtab **result);
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/* Check to see if the symbol is defined in a "partial" symbol table
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of OBJFILE. KIND 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 symbol table in which the symbol is
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defined, or NULL if no such symbol table exists. */
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struct symtab *(*lookup_symbol) (struct objfile *objfile,
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int kind, const char *name,
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domain_enum domain);
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/* This is called to expand symbol tables before looking up a
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symbol. A backend can choose to implement this and then have its
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`lookup_symbol' hook always return NULL, or the reverse. (It
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doesn't make sense to implement both.) The arguments are as for
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`lookup_symbol'. */
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void (*pre_expand_symtabs_matching) (struct objfile *objfile,
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enum block_enum block_kind,
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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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/* This is called by objfile_relocate to relocate any indices loaded
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for OBJFILE. */
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void (*relocate) (struct objfile *objfile,
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struct section_offsets *new_offsets,
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struct section_offsets *delta);
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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 the
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file name FILENAME.
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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_filename) (struct objfile *objfile,
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const char *filename);
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/* Return the file name of the file holding the symbol in OBJFILE
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named NAME. If no such symbol exists in OBJFILE, return NULL. */
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const char *(*find_symbol_file) (struct objfile *objfile, const char *name);
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/* Find global or static symbols in all tables that are in NAMESPACE
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and for which MATCH (symbol name, NAME) == 0, passing each to
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CALLBACK, reading in partial symbol symbol tables as needed. Look
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through global symbols if GLOBAL and otherwise static symbols.
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Passes NAME, NAMESPACE, and DATA 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 in the sense that
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strcmp_iw(x,y) == 0 --> MATCH(x,y) == 0. ORDERED_COMPARE, if
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non-null, must be an ordering relation compatible with strcmp_iw
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in the sense that
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strcmp(x,y) == 0 --> ORDERED_COMPARE(x,y) == 0
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and
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strcmp(x,y) <= 0 --> ORDERED_COMPARE(x,y) <= 0
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(allowing strcmp(x,y) < 0 while ORDERED_COMPARE(x, y) == 0).
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CALLBACK returns 0 to indicate that the scan should continue, or
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non-zero to indicate that the scan should be terminated. */
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void (*map_matching_symbols) (const char *name, domain_enum namespace,
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struct objfile *, int global,
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int (*callback) (struct block *,
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struct symbol *, void *),
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void *data,
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symbol_compare_ftype *match,
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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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and the DATA argument are passed to it. If it returns zero, this
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file is skipped. If FILE_MATCHER is NULL such file is not skipped.
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Otherwise, if KIND does not match this symbol is skipped.
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If even KIND matches, then NAME_MATCHER is called for each symbol defined
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in the file. The symbol's "natural" name and DATA are passed to
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NAME_MATCHER.
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If NAME_MATCHER returns zero, then this symbol is skipped.
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Otherwise, this symbol's symbol table is expanded.
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DATA is user data that is passed unmodified to the callback
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functions. */
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void (*expand_symtabs_matching) (struct objfile *objfile,
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int (*file_matcher) (const char *, void *),
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int (*name_matcher) (const char *, void *),
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enum search_domain kind,
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void *data);
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/* Return the symbol table from OBJFILE that contains PC and
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SECTION. Return NULL if there is no such symbol table. This
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should return the symbol table 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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symbol table that contains a symbol whose address is closest to
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PC. */
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struct symtab *(*find_pc_sect_symtab) (struct objfile *objfile,
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struct minimal_symbol *msymbol,
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CORE_ADDR pc,
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struct obj_section *section,
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int warn_if_readin);
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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 name,
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the file's full name, and the DATA passed to this function. */
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void (*map_symbol_filenames) (struct objfile *objfile,
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void (*fun) (const char *, const char *,
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void *),
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void *data);
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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, 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 *, int);
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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, 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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/* 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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/* 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 struct 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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(struct section_offsets *section_offsets, int num_sections,
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struct section_addr_info *addrs);
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extern void addr_info_make_relative (struct 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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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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/* 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 (const char *, struct objfile *);
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extern void add_symtab_fns (const struct sym_fns *);
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/* This enum encodes bit-flags passed as ADD_FLAGS parameter to
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syms_from_objfile, symbol_file_add, etc. */
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enum symfile_add_flags
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{
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/* Be chatty about what you are doing. */
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SYMFILE_VERBOSE = 1 << 1,
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/* This is the main symbol file (as opposed to symbol file for dynamically
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loaded code). */
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SYMFILE_MAINLINE = 1 << 2,
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/* Do not call breakpoint_re_set when adding this symbol file. */
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SYMFILE_DEFER_BP_RESET = 1 << 3,
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/* Do not immediately read symbols for this file. By default,
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symbols are read when the objfile is created. */
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SYMFILE_NO_READ = 1 << 4
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};
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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);
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extern void new_symfile_objfile (struct objfile *, int);
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extern struct objfile *symbol_file_add (char *, int,
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struct section_addr_info *, 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, struct objfile *parent);
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extern void symbol_file_add_separate (bfd *, int, struct objfile *);
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extern char *find_separate_debug_file_by_debuglink (struct objfile *);
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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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/* 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 target_section
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*start,
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const struct target_section
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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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/* 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 NULL terminated variable argument list of `const char
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*' strings; return the new string. Space is found in the OBSTACKP.
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Argument list must be terminated by a sentinel expression `(char *)
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NULL'. */
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extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
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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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/* 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 bfd *symfile_bfd_open (char *);
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extern bfd *bfd_open_maybe_remote (const 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 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 (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 (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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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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extern struct cleanup *increment_reading_symtab (void);
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/* From dwarf2read.c */
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extern int dwarf2_has_info (struct objfile *);
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extern int dwarf2_initialize_objfile (struct objfile *);
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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 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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