1660 lines
52 KiB
C
1660 lines
52 KiB
C
/* Read dbx symbol tables and convert to internal format, for GDB.
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Copyright 1986, 1987, 1988, 1989, 1990, 1991 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 2 of the License, or
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||
(at your option) any later version.
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||
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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, write to the Free Software
|
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This module provides three functions: dbx_symfile_init,
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which initializes to read a symbol file; dbx_new_init, which
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discards existing cached information when all symbols are being
|
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discarded; and dbx_symfile_read, which reads a symbol table
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from a file.
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dbx_symfile_read only does the minimum work necessary for letting the
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user "name" things symbolically; it does not read the entire symtab.
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Instead, it reads the external and static symbols and puts them in partial
|
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symbol tables. When more extensive information is requested of a
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file, the corresponding partial symbol table is mutated into a full
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fledged symbol table by going back and reading the symbols
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for real. dbx_psymtab_to_symtab() is the function that does this */
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#include "defs.h"
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#include <string.h>
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#ifdef USG
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#include <sys/types.h>
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#include <fcntl.h>
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#define L_SET 0
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#define L_INCR 1
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#endif
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#include <obstack.h>
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#include <sys/param.h>
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#ifndef NO_SYS_FILE
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#include <sys/file.h>
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#endif
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#include <sys/stat.h>
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#include <ctype.h>
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#include "symtab.h"
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#include "breakpoint.h"
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#include "command.h"
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#include "target.h"
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#include "gdbcore.h" /* for bfd stuff */
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#include "libbfd.h" /* FIXME Secret internal BFD stuff (bfd_read) */
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#include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */
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#include "symfile.h"
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#include "objfiles.h"
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#include "buildsym.h"
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#include "aout/aout64.h"
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#include "aout/stab_gnu.h" /* We always use GNU stabs, not native, now */
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/* Information is passed among various dbxread routines for accessing
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symbol files. A pointer to this structure is kept in the sym_private
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field of the objfile struct. */
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struct dbx_symfile_info {
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asection *text_sect; /* Text section accessor */
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int symcount; /* How many symbols are there in the file */
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char *stringtab; /* The actual string table */
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int stringtab_size; /* Its size */
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off_t symtab_offset; /* Offset in file to symbol table */
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};
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#define DBX_SYMFILE_INFO(o) ((struct dbx_symfile_info *)((o)->sym_private))
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#define DBX_TEXT_SECT(o) (DBX_SYMFILE_INFO(o)->text_sect)
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#define DBX_SYMCOUNT(o) (DBX_SYMFILE_INFO(o)->symcount)
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#define DBX_STRINGTAB(o) (DBX_SYMFILE_INFO(o)->stringtab)
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#define DBX_STRINGTAB_SIZE(o) (DBX_SYMFILE_INFO(o)->stringtab_size)
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#define DBX_SYMTAB_OFFSET(o) (DBX_SYMFILE_INFO(o)->symtab_offset)
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/* Each partial symbol table entry contains a pointer to private data for the
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read_symtab() function to use when expanding a partial symbol table entry
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to a full symbol table entry.
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For dbxread this structure contains the offset within the file symbol table
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of first local symbol for this file, and length (in bytes) of the section
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of the symbol table devoted to this file's symbols (actually, the section
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bracketed may contain more than just this file's symbols). If ldsymlen is
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0, the only reason for this thing's existence is the dependency list.
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Nothing else will happen when it is read in. */
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#define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff)
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#define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen)
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struct symloc {
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int ldsymoff;
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int ldsymlen;
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};
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/* Macro to determine which symbols to ignore when reading the first symbol
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of a file. Some machines override this definition. */
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#ifndef IGNORE_SYMBOL
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/* This code is used on Ultrix systems. Ignore it */
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#define IGNORE_SYMBOL(type) (type == (int)N_NSYMS)
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#endif
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/* Macro for name of symbol to indicate a file compiled with gcc. */
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#ifndef GCC_COMPILED_FLAG_SYMBOL
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#define GCC_COMPILED_FLAG_SYMBOL "gcc_compiled."
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#endif
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/* Macro for name of symbol to indicate a file compiled with gcc2. */
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#ifndef GCC2_COMPILED_FLAG_SYMBOL
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#define GCC2_COMPILED_FLAG_SYMBOL "gcc2_compiled."
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#endif
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/* Define this as 1 if a pcc declaration of a char or short argument
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gives the correct address. Otherwise assume pcc gives the
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address of the corresponding int, which is not the same on a
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big-endian machine. */
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#ifndef BELIEVE_PCC_PROMOTION
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#define BELIEVE_PCC_PROMOTION 0
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#endif
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/* Nonzero means give verbose info on gdb action. From main.c. */
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extern int info_verbose;
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/* The BFD for this file -- implicit parameter to next_symbol_text. */
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static bfd *symfile_bfd;
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/* The objfile for this file -- only good in process_one_symbol(). */
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static struct objfile *our_objfile;
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/* The size of each symbol in the symbol file (in external form).
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This is set by dbx_symfile_read when building psymtabs, and by
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dbx_psymtab_to_symtab when building symtabs. */
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static unsigned symbol_size;
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/* Complaints about the symbols we have encountered. */
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struct complaint lbrac_complaint =
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{"bad block start address patched", 0, 0};
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struct complaint string_table_offset_complaint =
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{"bad string table offset in symbol %d", 0, 0};
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struct complaint unknown_symtype_complaint =
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{"unknown symbol type %s", 0, 0};
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struct complaint lbrac_rbrac_complaint =
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{"block start larger than block end", 0, 0};
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struct complaint lbrac_unmatched_complaint =
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{"unmatched N_LBRAC before symtab pos %d", 0, 0};
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struct complaint lbrac_mismatch_complaint =
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{"N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d", 0, 0};
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/* During initial symbol readin, we need to have a structure to keep
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track of which psymtabs have which bincls in them. This structure
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is used during readin to setup the list of dependencies within each
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partial symbol table. */
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struct header_file_location
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{
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char *name; /* Name of header file */
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int instance; /* See above */
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struct partial_symtab *pst; /* Partial symtab that has the
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BINCL/EINCL defs for this file */
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};
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/* The actual list and controling variables */
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static struct header_file_location *bincl_list, *next_bincl;
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static int bincls_allocated;
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/* Local function prototypes */
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static void
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free_header_files PARAMS ((void));
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static void
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init_header_files PARAMS ((void));
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static struct pending *
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copy_pending PARAMS ((struct pending *, int, struct pending *));
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static struct symtab *
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read_ofile_symtab PARAMS ((struct objfile *, int, int, CORE_ADDR, int, int));
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static void
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dbx_psymtab_to_symtab PARAMS ((struct partial_symtab *));
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static void
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psymtab_to_symtab_1 PARAMS ((struct partial_symtab *, int));
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static void
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read_dbx_symtab PARAMS ((CORE_ADDR, struct objfile *, CORE_ADDR, int));
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static void
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free_bincl_list PARAMS ((struct objfile *));
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static struct partial_symtab *
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find_corresponding_bincl_psymtab PARAMS ((char *, int));
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static void
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add_bincl_to_list PARAMS ((struct partial_symtab *, char *, int));
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static void
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init_bincl_list PARAMS ((int, struct objfile *));
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static void
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init_psymbol_list PARAMS ((struct objfile *));
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static char *
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dbx_next_symbol_text PARAMS ((void));
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static void
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fill_symbuf PARAMS ((bfd *));
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static void
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dbx_symfile_init PARAMS ((struct objfile *));
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static void
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dbx_new_init PARAMS ((struct objfile *));
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static void
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dbx_symfile_read PARAMS ((struct objfile *, CORE_ADDR, int));
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static void
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dbx_symfile_finish PARAMS ((struct objfile *));
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static void
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record_minimal_symbol PARAMS ((char *, CORE_ADDR, int, struct objfile *));
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static void
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add_new_header_file PARAMS ((char *, int));
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static void
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add_old_header_file PARAMS ((char *, int));
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static void
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add_this_object_header_file PARAMS ((int));
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/* Free up old header file tables */
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static void
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free_header_files ()
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{
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register int i;
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if (header_files != NULL)
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{
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for (i = 0; i < n_header_files; i++)
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{
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free (header_files[i].name);
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}
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free ((PTR)header_files);
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header_files = NULL;
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n_header_files = 0;
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}
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if (this_object_header_files)
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{
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free ((PTR)this_object_header_files);
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this_object_header_files = NULL;
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}
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n_allocated_header_files = 0;
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n_allocated_this_object_header_files = 0;
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}
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/* Allocate new header file tables */
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static void
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init_header_files ()
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{
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n_header_files = 0;
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n_allocated_header_files = 10;
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header_files = (struct header_file *)
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xmalloc (10 * sizeof (struct header_file));
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n_allocated_this_object_header_files = 10;
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this_object_header_files = (int *) xmalloc (10 * sizeof (int));
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}
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/* Add header file number I for this object file
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at the next successive FILENUM. */
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static void
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add_this_object_header_file (i)
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int i;
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{
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if (n_this_object_header_files == n_allocated_this_object_header_files)
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{
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n_allocated_this_object_header_files *= 2;
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this_object_header_files
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= (int *) xrealloc ((char *) this_object_header_files,
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n_allocated_this_object_header_files * sizeof (int));
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}
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this_object_header_files[n_this_object_header_files++] = i;
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}
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/* Add to this file an "old" header file, one already seen in
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a previous object file. NAME is the header file's name.
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INSTANCE is its instance code, to select among multiple
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symbol tables for the same header file. */
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static void
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add_old_header_file (name, instance)
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char *name;
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int instance;
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{
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register struct header_file *p = header_files;
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register int i;
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for (i = 0; i < n_header_files; i++)
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if (!strcmp (p[i].name, name) && instance == p[i].instance)
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{
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add_this_object_header_file (i);
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return;
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}
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error ("Invalid symbol data: \"repeated\" header file that hasn't been seen before, at symtab pos %d.",
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symnum);
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}
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/* Add to this file a "new" header file: definitions for its types follow.
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NAME is the header file's name.
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Most often this happens only once for each distinct header file,
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but not necessarily. If it happens more than once, INSTANCE has
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a different value each time, and references to the header file
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use INSTANCE values to select among them.
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dbx output contains "begin" and "end" markers for each new header file,
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but at this level we just need to know which files there have been;
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so we record the file when its "begin" is seen and ignore the "end". */
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static void
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add_new_header_file (name, instance)
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char *name;
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int instance;
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{
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register int i;
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header_file_prev_index = -1;
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/* Make sure there is room for one more header file. */
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if (n_header_files == n_allocated_header_files)
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{
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n_allocated_header_files *= 2;
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header_files = (struct header_file *)
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xrealloc ((char *) header_files,
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(n_allocated_header_files * sizeof (struct header_file)));
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}
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/* Create an entry for this header file. */
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i = n_header_files++;
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header_files[i].name = savestring (name, strlen(name));
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header_files[i].instance = instance;
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header_files[i].length = 10;
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header_files[i].vector
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= (struct type **) xmalloc (10 * sizeof (struct type *));
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bzero (header_files[i].vector, 10 * sizeof (struct type *));
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add_this_object_header_file (i);
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}
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#if 0
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static struct type **
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explicit_lookup_type (real_filenum, index)
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int real_filenum, index;
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{
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register struct header_file *f = &header_files[real_filenum];
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if (index >= f->length)
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{
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f->length *= 2;
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f->vector = (struct type **)
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xrealloc (f->vector, f->length * sizeof (struct type *));
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bzero (&f->vector[f->length / 2],
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f->length * sizeof (struct type *) / 2);
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}
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return &f->vector[index];
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||
}
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#endif
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static void
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record_minimal_symbol (name, address, type, objfile)
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char *name;
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CORE_ADDR address;
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int type;
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struct objfile *objfile;
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{
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enum minimal_symbol_type ms_type;
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||
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switch (type &~ N_EXT) {
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case N_TEXT: ms_type = mst_text; break;
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case N_DATA: ms_type = mst_data; break;
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case N_BSS: ms_type = mst_bss; break;
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||
case N_ABS: ms_type = mst_abs; break;
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||
#ifdef N_SETV
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||
case N_SETV: ms_type = mst_data; break;
|
||
#endif
|
||
default: ms_type = mst_unknown; break;
|
||
}
|
||
|
||
prim_record_minimal_symbol (obsavestring (name, strlen (name), &objfile -> symbol_obstack),
|
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address, ms_type);
|
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}
|
||
|
||
/* Scan and build partial symbols for a symbol file.
|
||
We have been initialized by a call to dbx_symfile_init, which
|
||
put all the relevant info into a "struct dbx_symfile_info",
|
||
hung off the objfile structure.
|
||
|
||
ADDR is the address relative to which the symbols in it are (e.g.
|
||
the base address of the text segment).
|
||
MAINLINE is true if we are reading the main symbol
|
||
table (as opposed to a shared lib or dynamically loaded file). */
|
||
|
||
static void
|
||
dbx_symfile_read (objfile, addr, mainline)
|
||
struct objfile *objfile;
|
||
CORE_ADDR addr;
|
||
int mainline; /* FIXME comments above */
|
||
{
|
||
bfd *sym_bfd;
|
||
int val;
|
||
|
||
sym_bfd = objfile->obfd;
|
||
val = bfd_seek (objfile->obfd, DBX_SYMTAB_OFFSET (objfile), L_SET);
|
||
if (val < 0)
|
||
perror_with_name (objfile->name);
|
||
|
||
/* If we are reinitializing, or if we have never loaded syms yet, init */
|
||
if (mainline || objfile->global_psymbols.size == 0 || objfile->static_psymbols.size == 0)
|
||
init_psymbol_list (objfile);
|
||
|
||
/* FIXME POKING INSIDE BFD DATA STRUCTURES */
|
||
symbol_size = obj_symbol_entry_size (sym_bfd);
|
||
|
||
pending_blocks = 0;
|
||
make_cleanup (really_free_pendings, 0);
|
||
|
||
init_minimal_symbol_collection ();
|
||
make_cleanup (discard_minimal_symbols, 0);
|
||
|
||
/* Now that the symbol table data of the executable file are all in core,
|
||
process them and define symbols accordingly. */
|
||
|
||
addr -= bfd_section_vma (sym_bfd, DBX_TEXT_SECT (objfile)); /*offset*/
|
||
read_dbx_symtab (addr, objfile,
|
||
bfd_section_vma (sym_bfd, DBX_TEXT_SECT (objfile)),
|
||
bfd_section_size (sym_bfd, DBX_TEXT_SECT (objfile)));
|
||
|
||
/* Install any minimal symbols that have been collected as the current
|
||
minimal symbols for this objfile. */
|
||
|
||
install_minimal_symbols (objfile);
|
||
|
||
if (!have_partial_symbols ()) {
|
||
wrap_here ("");
|
||
printf_filtered ("(no debugging symbols found)...");
|
||
wrap_here ("");
|
||
}
|
||
}
|
||
|
||
/* Initialize anything that needs initializing when a completely new
|
||
symbol file is specified (not just adding some symbols from another
|
||
file, e.g. a shared library). */
|
||
|
||
static void
|
||
dbx_new_init (ignore)
|
||
struct objfile *ignore;
|
||
{
|
||
buildsym_new_init ();
|
||
init_header_files ();
|
||
}
|
||
|
||
|
||
/* dbx_symfile_init ()
|
||
is the dbx-specific initialization routine for reading symbols.
|
||
It is passed a struct objfile which contains, among other things,
|
||
the BFD for the file whose symbols are being read, and a slot for a pointer
|
||
to "private data" which we fill with goodies.
|
||
|
||
We read the string table into malloc'd space and stash a pointer to it.
|
||
|
||
Since BFD doesn't know how to read debug symbols in a format-independent
|
||
way (and may never do so...), we have to do it ourselves. We will never
|
||
be called unless this is an a.out (or very similar) file.
|
||
FIXME, there should be a cleaner peephole into the BFD environment here. */
|
||
|
||
static void
|
||
dbx_symfile_init (objfile)
|
||
struct objfile *objfile;
|
||
{
|
||
int val;
|
||
bfd *sym_bfd = objfile->obfd;
|
||
char *name = bfd_get_filename (sym_bfd);
|
||
unsigned char size_temp[4];
|
||
|
||
/* Allocate struct to keep track of the symfile */
|
||
objfile->sym_private = (PTR)
|
||
xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));
|
||
|
||
/* FIXME POKING INSIDE BFD DATA STRUCTURES */
|
||
#define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd))
|
||
#define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd))
|
||
/* FIXME POKING INSIDE BFD DATA STRUCTURES */
|
||
|
||
DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
|
||
if (!DBX_TEXT_SECT (objfile))
|
||
abort();
|
||
DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd);
|
||
|
||
/* Read the string table and stash it away in the psymbol_obstack. It is
|
||
only needed as long as we need to expand psymbols into full symbols,
|
||
so when we blow away the psymbol the string table goes away as well.
|
||
Note that gdb used to use the results of attempting to malloc the
|
||
string table, based on the size it read, as a form of sanity check
|
||
for botched byte swapping, on the theory that a byte swapped string
|
||
table size would be so totally bogus that the malloc would fail. Now
|
||
that we put in on the psymbol_obstack, we can't do this since gdb gets
|
||
a fatal error (out of virtual memory) if the size is bogus. We can
|
||
however at least check to see if the size is zero or some negative
|
||
value. */
|
||
|
||
val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET);
|
||
if (val < 0)
|
||
perror_with_name (name);
|
||
|
||
val = bfd_read ((PTR)size_temp, sizeof (long), 1, sym_bfd);
|
||
if (val < 0)
|
||
perror_with_name (name);
|
||
|
||
DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp);
|
||
if (DBX_STRINGTAB_SIZE (objfile) <= 0)
|
||
error ("ridiculous string table size (%d bytes).",
|
||
DBX_STRINGTAB_SIZE (objfile));
|
||
|
||
DBX_STRINGTAB (objfile) =
|
||
(char *) obstack_alloc (&objfile -> psymbol_obstack,
|
||
DBX_STRINGTAB_SIZE (objfile));
|
||
|
||
/* Now read in the string table in one big gulp. */
|
||
|
||
val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET);
|
||
if (val < 0)
|
||
perror_with_name (name);
|
||
val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1,
|
||
sym_bfd);
|
||
if (val != DBX_STRINGTAB_SIZE (objfile))
|
||
perror_with_name (name);
|
||
|
||
/* Record the position of the symbol table for later use. */
|
||
|
||
DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
|
||
}
|
||
|
||
/* Perform any local cleanups required when we are done with a particular
|
||
objfile. I.E, we are in the process of discarding all symbol information
|
||
for an objfile, freeing up all memory held for it, and unlinking the
|
||
objfile struct from the global list of known objfiles. */
|
||
|
||
static void
|
||
dbx_symfile_finish (objfile)
|
||
struct objfile *objfile;
|
||
{
|
||
if (objfile->sym_private != NULL)
|
||
{
|
||
mfree (objfile -> md, objfile->sym_private);
|
||
}
|
||
free_header_files ();
|
||
}
|
||
|
||
|
||
/* Buffer for reading the symbol table entries. */
|
||
static struct internal_nlist symbuf[4096];
|
||
static int symbuf_idx;
|
||
static int symbuf_end;
|
||
|
||
/* The address in memory of the string table of the object file we are
|
||
reading (which might not be the "main" object file, but might be a
|
||
shared library or some other dynamically loaded thing). This is set
|
||
by read_dbx_symtab when building psymtabs, and by read_ofile_symtab
|
||
when building symtabs, and is used only by next_symbol_text. */
|
||
static char *stringtab_global;
|
||
|
||
/* Refill the symbol table input buffer
|
||
and set the variables that control fetching entries from it.
|
||
Reports an error if no data available.
|
||
This function can read past the end of the symbol table
|
||
(into the string table) but this does no harm. */
|
||
|
||
static void
|
||
fill_symbuf (sym_bfd)
|
||
bfd *sym_bfd;
|
||
{
|
||
int nbytes = bfd_read ((PTR)symbuf, sizeof (symbuf), 1, sym_bfd);
|
||
if (nbytes < 0)
|
||
perror_with_name (bfd_get_filename (sym_bfd));
|
||
else if (nbytes == 0)
|
||
error ("Premature end of file reading symbol table");
|
||
symbuf_end = nbytes / symbol_size;
|
||
symbuf_idx = 0;
|
||
}
|
||
|
||
#define SWAP_SYMBOL(symp, abfd) \
|
||
{ \
|
||
(symp)->n_strx = bfd_h_get_32(abfd, \
|
||
(unsigned char *)&(symp)->n_strx); \
|
||
(symp)->n_desc = bfd_h_get_16 (abfd, \
|
||
(unsigned char *)&(symp)->n_desc); \
|
||
(symp)->n_value = bfd_h_get_32 (abfd, \
|
||
(unsigned char *)&(symp)->n_value); \
|
||
}
|
||
|
||
/* Invariant: The symbol pointed to by symbuf_idx is the first one
|
||
that hasn't been swapped. Swap the symbol at the same time
|
||
that symbuf_idx is incremented. */
|
||
|
||
/* dbx allows the text of a symbol name to be continued into the
|
||
next symbol name! When such a continuation is encountered
|
||
(a \ at the end of the text of a name)
|
||
call this function to get the continuation. */
|
||
|
||
static char *
|
||
dbx_next_symbol_text ()
|
||
{
|
||
if (symbuf_idx == symbuf_end)
|
||
fill_symbuf (symfile_bfd);
|
||
symnum++;
|
||
SWAP_SYMBOL(&symbuf[symbuf_idx], symfile_bfd);
|
||
return symbuf[symbuf_idx++].n_strx + stringtab_global;
|
||
}
|
||
|
||
/* Initializes storage for all of the partial symbols that will be
|
||
created by read_dbx_symtab and subsidiaries. */
|
||
|
||
static void
|
||
init_psymbol_list (objfile)
|
||
struct objfile *objfile;
|
||
{
|
||
/* Free any previously allocated psymbol lists. */
|
||
if (objfile -> global_psymbols.list)
|
||
mfree (objfile -> md, (PTR)objfile -> global_psymbols.list);
|
||
if (objfile -> static_psymbols.list)
|
||
mfree (objfile -> md, (PTR)objfile -> static_psymbols.list);
|
||
|
||
/* Current best guess is that there are approximately a twentieth
|
||
of the total symbols (in a debugging file) are global or static
|
||
oriented symbols */
|
||
objfile -> global_psymbols.size = DBX_SYMCOUNT (objfile) / 10;
|
||
objfile -> static_psymbols.size = DBX_SYMCOUNT (objfile) / 10;
|
||
objfile -> global_psymbols.next = objfile -> global_psymbols.list = (struct partial_symbol *)
|
||
xmmalloc (objfile -> md, objfile -> global_psymbols.size * sizeof (struct partial_symbol));
|
||
objfile -> static_psymbols.next = objfile -> static_psymbols.list = (struct partial_symbol *)
|
||
xmmalloc (objfile -> md, objfile -> static_psymbols.size * sizeof (struct partial_symbol));
|
||
}
|
||
|
||
/* Initialize the list of bincls to contain none and have some
|
||
allocated. */
|
||
|
||
static void
|
||
init_bincl_list (number, objfile)
|
||
int number;
|
||
struct objfile *objfile;
|
||
{
|
||
bincls_allocated = number;
|
||
next_bincl = bincl_list = (struct header_file_location *)
|
||
xmmalloc (objfile -> md, bincls_allocated * sizeof(struct header_file_location));
|
||
}
|
||
|
||
/* Add a bincl to the list. */
|
||
|
||
static void
|
||
add_bincl_to_list (pst, name, instance)
|
||
struct partial_symtab *pst;
|
||
char *name;
|
||
int instance;
|
||
{
|
||
if (next_bincl >= bincl_list + bincls_allocated)
|
||
{
|
||
int offset = next_bincl - bincl_list;
|
||
bincls_allocated *= 2;
|
||
bincl_list = (struct header_file_location *)
|
||
xmrealloc (pst->objfile->md, (char *)bincl_list,
|
||
bincls_allocated * sizeof (struct header_file_location));
|
||
next_bincl = bincl_list + offset;
|
||
}
|
||
next_bincl->pst = pst;
|
||
next_bincl->instance = instance;
|
||
next_bincl++->name = name;
|
||
}
|
||
|
||
/* Given a name, value pair, find the corresponding
|
||
bincl in the list. Return the partial symtab associated
|
||
with that header_file_location. */
|
||
|
||
static struct partial_symtab *
|
||
find_corresponding_bincl_psymtab (name, instance)
|
||
char *name;
|
||
int instance;
|
||
{
|
||
struct header_file_location *bincl;
|
||
|
||
for (bincl = bincl_list; bincl < next_bincl; bincl++)
|
||
if (bincl->instance == instance
|
||
&& !strcmp (name, bincl->name))
|
||
return bincl->pst;
|
||
|
||
return (struct partial_symtab *) 0;
|
||
}
|
||
|
||
/* Free the storage allocated for the bincl list. */
|
||
|
||
static void
|
||
free_bincl_list (objfile)
|
||
struct objfile *objfile;
|
||
{
|
||
mfree (objfile -> md, (PTR)bincl_list);
|
||
bincls_allocated = 0;
|
||
}
|
||
|
||
/* Given pointers to an a.out symbol table in core containing dbx
|
||
style data, setup partial_symtab's describing each source file for
|
||
which debugging information is available.
|
||
SYMFILE_NAME is the name of the file we are reading from
|
||
and ADDR is its relocated address (if incremental) or 0 (if not). */
|
||
|
||
static void
|
||
read_dbx_symtab (addr, objfile, text_addr, text_size)
|
||
CORE_ADDR addr;
|
||
struct objfile *objfile;
|
||
CORE_ADDR text_addr;
|
||
int text_size;
|
||
{
|
||
register struct internal_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch */
|
||
register char *namestring;
|
||
int nsl;
|
||
int past_first_source_file = 0;
|
||
CORE_ADDR last_o_file_start = 0;
|
||
struct cleanup *old_chain;
|
||
bfd *abfd;
|
||
|
||
/* End of the text segment of the executable file. */
|
||
CORE_ADDR end_of_text_addr;
|
||
|
||
/* Current partial symtab */
|
||
struct partial_symtab *pst;
|
||
|
||
/* List of current psymtab's include files */
|
||
char **psymtab_include_list;
|
||
int includes_allocated;
|
||
int includes_used;
|
||
|
||
/* Index within current psymtab dependency list */
|
||
struct partial_symtab **dependency_list;
|
||
int dependencies_used, dependencies_allocated;
|
||
|
||
stringtab_global = DBX_STRINGTAB (objfile);
|
||
|
||
pst = (struct partial_symtab *) 0;
|
||
|
||
includes_allocated = 30;
|
||
includes_used = 0;
|
||
psymtab_include_list = (char **) alloca (includes_allocated *
|
||
sizeof (char *));
|
||
|
||
dependencies_allocated = 30;
|
||
dependencies_used = 0;
|
||
dependency_list =
|
||
(struct partial_symtab **) alloca (dependencies_allocated *
|
||
sizeof (struct partial_symtab *));
|
||
|
||
old_chain = make_cleanup (free_objfile, objfile);
|
||
|
||
/* Init bincl list */
|
||
init_bincl_list (20, objfile);
|
||
make_cleanup (free_bincl_list, objfile);
|
||
|
||
last_source_file = 0;
|
||
|
||
#ifdef END_OF_TEXT_DEFAULT
|
||
end_of_text_addr = END_OF_TEXT_DEFAULT;
|
||
#else
|
||
end_of_text_addr = text_addr + addr + text_size; /* Relocate */
|
||
#endif
|
||
|
||
symfile_bfd = objfile->obfd; /* For next_text_symbol */
|
||
abfd = objfile->obfd;
|
||
symbuf_end = symbuf_idx = 0;
|
||
next_symbol_text_func = dbx_next_symbol_text;
|
||
|
||
for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++)
|
||
{
|
||
/* Get the symbol for this run and pull out some info */
|
||
QUIT; /* allow this to be interruptable */
|
||
if (symbuf_idx == symbuf_end)
|
||
fill_symbuf (abfd);
|
||
bufp = &symbuf[symbuf_idx++];
|
||
|
||
/*
|
||
* Special case to speed up readin.
|
||
*/
|
||
if (bufp->n_type == (unsigned char)N_SLINE) continue;
|
||
|
||
SWAP_SYMBOL (bufp, abfd);
|
||
|
||
/* Ok. There is a lot of code duplicated in the rest of this
|
||
switch statement (for efficiency reasons). Since I don't
|
||
like duplicating code, I will do my penance here, and
|
||
describe the code which is duplicated:
|
||
|
||
*) The assignment to namestring.
|
||
*) The call to strchr.
|
||
*) The addition of a partial symbol the the two partial
|
||
symbol lists. This last is a large section of code, so
|
||
I've imbedded it in the following macro.
|
||
*/
|
||
|
||
/* Set namestring based on bufp. If the string table index is invalid,
|
||
give a fake name, and print a single error message per symbol file read,
|
||
rather than abort the symbol reading or flood the user with messages. */
|
||
#define SET_NAMESTRING()\
|
||
if (((unsigned)bufp->n_strx) >= DBX_STRINGTAB_SIZE (objfile)) { \
|
||
complain (&string_table_offset_complaint, (char *) symnum); \
|
||
namestring = "foo"; \
|
||
} else \
|
||
namestring = bufp->n_strx + DBX_STRINGTAB (objfile)
|
||
|
||
#define CUR_SYMBOL_TYPE bufp->n_type
|
||
#define CUR_SYMBOL_VALUE bufp->n_value
|
||
#define DBXREAD_ONLY
|
||
#define START_PSYMTAB(ofile,addr,fname,low,symoff,global_syms,static_syms)\
|
||
start_psymtab(ofile, addr, fname, low, symoff, global_syms, static_syms)
|
||
#define END_PSYMTAB(pst,ilist,ninc,c_off,c_text,dep_list,n_deps)\
|
||
end_psymtab(pst,ilist,ninc,c_off,c_text,dep_list,n_deps)
|
||
|
||
#include "partial-stab.h"
|
||
}
|
||
|
||
/* If there's stuff to be cleaned up, clean it up. */
|
||
if (DBX_SYMCOUNT (objfile) > 0 /* We have some syms */
|
||
&& objfile -> ei.entry_point < bufp->n_value
|
||
&& objfile -> ei.entry_point >= last_o_file_start)
|
||
{
|
||
objfile -> ei.entry_file_lowpc = last_o_file_start;
|
||
objfile -> ei.entry_file_highpc = bufp->n_value;
|
||
}
|
||
|
||
if (pst)
|
||
{
|
||
end_psymtab (pst, psymtab_include_list, includes_used,
|
||
symnum * symbol_size, end_of_text_addr,
|
||
dependency_list, dependencies_used);
|
||
}
|
||
|
||
free_bincl_list (objfile);
|
||
discard_cleanups (old_chain);
|
||
}
|
||
|
||
/* Allocate and partially fill a partial symtab. It will be
|
||
completely filled at the end of the symbol list.
|
||
|
||
SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
|
||
is the address relative to which its symbols are (incremental) or 0
|
||
(normal). */
|
||
|
||
|
||
struct partial_symtab *
|
||
start_psymtab (objfile, addr,
|
||
filename, textlow, ldsymoff, global_syms, static_syms)
|
||
struct objfile *objfile;
|
||
CORE_ADDR addr;
|
||
char *filename;
|
||
CORE_ADDR textlow;
|
||
int ldsymoff;
|
||
struct partial_symbol *global_syms;
|
||
struct partial_symbol *static_syms;
|
||
{
|
||
struct partial_symtab *result =
|
||
start_psymtab_common(objfile, addr,
|
||
filename, textlow, global_syms, static_syms);
|
||
|
||
result->read_symtab_private = (char *)
|
||
obstack_alloc (&objfile -> psymbol_obstack, sizeof (struct symloc));
|
||
LDSYMOFF(result) = ldsymoff;
|
||
result->read_symtab = dbx_psymtab_to_symtab;
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Close off the current usage of a partial_symbol table entry. This
|
||
involves setting the correct number of includes (with a realloc),
|
||
setting the high text mark, setting the symbol length in the
|
||
executable, and setting the length of the global and static lists
|
||
of psymbols.
|
||
|
||
The global symbols and static symbols are then seperately sorted.
|
||
|
||
Then the partial symtab is put on the global list.
|
||
*** List variables and peculiarities of same. ***
|
||
*/
|
||
|
||
void
|
||
end_psymtab (pst, include_list, num_includes, capping_symbol_offset,
|
||
capping_text, dependency_list, number_dependencies)
|
||
struct partial_symtab *pst;
|
||
char **include_list;
|
||
int num_includes;
|
||
int capping_symbol_offset;
|
||
CORE_ADDR capping_text;
|
||
struct partial_symtab **dependency_list;
|
||
int number_dependencies;
|
||
/* struct partial_symbol *capping_global, *capping_static;*/
|
||
{
|
||
int i;
|
||
struct objfile *objfile = pst -> objfile;
|
||
|
||
if (capping_symbol_offset != -1)
|
||
LDSYMLEN(pst) = capping_symbol_offset - LDSYMOFF(pst);
|
||
pst->texthigh = capping_text;
|
||
|
||
pst->n_global_syms =
|
||
objfile->global_psymbols.next - (objfile->global_psymbols.list + pst->globals_offset);
|
||
pst->n_static_syms =
|
||
objfile->static_psymbols.next - (objfile->static_psymbols.list + pst->statics_offset);
|
||
|
||
pst->number_of_dependencies = number_dependencies;
|
||
if (number_dependencies)
|
||
{
|
||
pst->dependencies = (struct partial_symtab **)
|
||
obstack_alloc (&objfile->psymbol_obstack,
|
||
number_dependencies * sizeof (struct partial_symtab *));
|
||
memcpy (pst->dependencies, dependency_list,
|
||
number_dependencies * sizeof (struct partial_symtab *));
|
||
}
|
||
else
|
||
pst->dependencies = 0;
|
||
|
||
for (i = 0; i < num_includes; i++)
|
||
{
|
||
struct partial_symtab *subpst =
|
||
allocate_psymtab (include_list[i], objfile);
|
||
|
||
subpst->addr = pst->addr;
|
||
subpst->read_symtab_private =
|
||
(char *) obstack_alloc (&objfile->psymbol_obstack,
|
||
sizeof (struct symloc));
|
||
LDSYMOFF(subpst) =
|
||
LDSYMLEN(subpst) =
|
||
subpst->textlow =
|
||
subpst->texthigh = 0;
|
||
|
||
/* We could save slight bits of space by only making one of these,
|
||
shared by the entire set of include files. FIXME-someday. */
|
||
subpst->dependencies = (struct partial_symtab **)
|
||
obstack_alloc (&objfile->psymbol_obstack,
|
||
sizeof (struct partial_symtab *));
|
||
subpst->dependencies[0] = pst;
|
||
subpst->number_of_dependencies = 1;
|
||
|
||
subpst->globals_offset =
|
||
subpst->n_global_syms =
|
||
subpst->statics_offset =
|
||
subpst->n_static_syms = 0;
|
||
|
||
subpst->readin = 0;
|
||
subpst->symtab = 0;
|
||
subpst->read_symtab = dbx_psymtab_to_symtab;
|
||
}
|
||
|
||
sort_pst_symbols (pst);
|
||
|
||
/* If there is already a psymtab or symtab for a file of this name, remove it.
|
||
(If there is a symtab, more drastic things also happen.)
|
||
This happens in VxWorks. */
|
||
free_named_symtabs (pst->filename);
|
||
|
||
if (num_includes == 0
|
||
&& number_dependencies == 0
|
||
&& pst->n_global_syms == 0
|
||
&& pst->n_static_syms == 0) {
|
||
/* Throw away this psymtab, it's empty. We can't deallocate it, since
|
||
it is on the obstack, but we can forget to chain it on the list. */
|
||
struct partial_symtab *prev_pst;
|
||
|
||
/* First, snip it out of the psymtab chain */
|
||
|
||
if (pst->objfile->psymtabs == pst)
|
||
pst->objfile->psymtabs = pst->next;
|
||
else
|
||
for (prev_pst = pst->objfile->psymtabs; prev_pst; prev_pst = pst->next)
|
||
if (prev_pst->next == pst)
|
||
prev_pst->next = pst->next;
|
||
|
||
/* Next, put it on a free list for recycling */
|
||
|
||
pst->next = pst->objfile->free_psymtabs;
|
||
pst->objfile->free_psymtabs = pst;
|
||
}
|
||
}
|
||
|
||
static void
|
||
psymtab_to_symtab_1 (pst, sym_offset)
|
||
struct partial_symtab *pst;
|
||
int sym_offset;
|
||
{
|
||
struct cleanup *old_chain;
|
||
int i;
|
||
|
||
if (!pst)
|
||
return;
|
||
|
||
if (pst->readin)
|
||
{
|
||
fprintf (stderr, "Psymtab for %s already read in. Shouldn't happen.\n",
|
||
pst->filename);
|
||
return;
|
||
}
|
||
|
||
/* Read in all partial symtabs on which this one is dependent */
|
||
for (i = 0; i < pst->number_of_dependencies; i++)
|
||
if (!pst->dependencies[i]->readin)
|
||
{
|
||
/* Inform about additional files that need to be read in. */
|
||
if (info_verbose)
|
||
{
|
||
fputs_filtered (" ", stdout);
|
||
wrap_here ("");
|
||
fputs_filtered ("and ", stdout);
|
||
wrap_here ("");
|
||
printf_filtered ("%s...", pst->dependencies[i]->filename);
|
||
wrap_here (""); /* Flush output */
|
||
fflush (stdout);
|
||
}
|
||
psymtab_to_symtab_1 (pst->dependencies[i], sym_offset);
|
||
}
|
||
|
||
if (LDSYMLEN(pst)) /* Otherwise it's a dummy */
|
||
{
|
||
/* Init stuff necessary for reading in symbols */
|
||
buildsym_init ();
|
||
old_chain = make_cleanup (really_free_pendings, 0);
|
||
|
||
/* Read in this files symbols */
|
||
bfd_seek (pst->objfile->obfd, sym_offset, L_SET);
|
||
pst->symtab =
|
||
read_ofile_symtab (pst->objfile, LDSYMOFF(pst), LDSYMLEN(pst),
|
||
pst->textlow, pst->texthigh - pst->textlow,
|
||
pst->addr);
|
||
sort_symtab_syms (pst->symtab);
|
||
|
||
do_cleanups (old_chain);
|
||
}
|
||
|
||
pst->readin = 1;
|
||
}
|
||
|
||
/* Read in all of the symbols for a given psymtab for real.
|
||
Be verbose about it if the user wants that. */
|
||
|
||
static void
|
||
dbx_psymtab_to_symtab (pst)
|
||
struct partial_symtab *pst;
|
||
{
|
||
bfd *sym_bfd;
|
||
|
||
if (!pst)
|
||
return;
|
||
|
||
if (pst->readin)
|
||
{
|
||
fprintf (stderr, "Psymtab for %s already read in. Shouldn't happen.\n",
|
||
pst->filename);
|
||
return;
|
||
}
|
||
|
||
if (LDSYMLEN(pst) || pst->number_of_dependencies)
|
||
{
|
||
/* Print the message now, before reading the string table,
|
||
to avoid disconcerting pauses. */
|
||
if (info_verbose)
|
||
{
|
||
printf_filtered ("Reading in symbols for %s...", pst->filename);
|
||
fflush (stdout);
|
||
}
|
||
|
||
sym_bfd = pst->objfile->obfd;
|
||
|
||
/* FIXME POKING INSIDE BFD DATA STRUCTURES */
|
||
symbol_size = obj_symbol_entry_size (sym_bfd);
|
||
|
||
next_symbol_text_func = dbx_next_symbol_text;
|
||
|
||
/* FIXME, this uses internal BFD variables. See above in
|
||
dbx_symbol_file_open where the macro is defined! */
|
||
psymtab_to_symtab_1 (pst, SYMBOL_TABLE_OFFSET);
|
||
|
||
/* Match with global symbols. This only needs to be done once,
|
||
after all of the symtabs and dependencies have been read in. */
|
||
scan_file_globals (pst->objfile);
|
||
|
||
/* Finish up the debug error message. */
|
||
if (info_verbose)
|
||
printf_filtered ("done.\n");
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Read in a defined section of a specific object file's symbols.
|
||
*
|
||
* DESC is the file descriptor for the file, positioned at the
|
||
* beginning of the symtab
|
||
* SYM_OFFSET is the offset within the file of
|
||
* the beginning of the symbols we want to read
|
||
* SYM_SIZE is the size of the symbol info to read in.
|
||
* TEXT_OFFSET is the beginning of the text segment we are reading symbols for
|
||
* TEXT_SIZE is the size of the text segment read in.
|
||
* OFFSET is a relocation offset which gets added to each symbol
|
||
*/
|
||
|
||
static struct symtab *
|
||
read_ofile_symtab (objfile, sym_offset, sym_size, text_offset, text_size,
|
||
offset)
|
||
struct objfile *objfile;
|
||
int sym_offset;
|
||
int sym_size;
|
||
CORE_ADDR text_offset;
|
||
int text_size;
|
||
int offset;
|
||
{
|
||
register char *namestring;
|
||
register struct internal_nlist *bufp;
|
||
unsigned char type;
|
||
unsigned max_symnum;
|
||
register bfd *abfd;
|
||
|
||
current_objfile = objfile;
|
||
subfile_stack = 0;
|
||
|
||
stringtab_global = DBX_STRINGTAB (objfile);
|
||
last_source_file = 0;
|
||
|
||
abfd = objfile->obfd;
|
||
symfile_bfd = objfile->obfd; /* Implicit param to next_text_symbol */
|
||
our_objfile = objfile; /* For end_symtab calls in process_one_symbol */
|
||
symbuf_end = symbuf_idx = 0;
|
||
|
||
/* It is necessary to actually read one symbol *before* the start
|
||
of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL
|
||
occurs before the N_SO symbol.
|
||
|
||
Detecting this in read_dbx_symtab
|
||
would slow down initial readin, so we look for it here instead. */
|
||
if (sym_offset >= (int)symbol_size)
|
||
{
|
||
bfd_seek (symfile_bfd, sym_offset - symbol_size, L_INCR);
|
||
fill_symbuf (abfd);
|
||
bufp = &symbuf[symbuf_idx++];
|
||
SWAP_SYMBOL (bufp, abfd);
|
||
|
||
SET_NAMESTRING ();
|
||
|
||
processing_gcc_compilation =
|
||
(bufp->n_type == N_TEXT
|
||
&& (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0
|
||
|| strcmp(namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0));
|
||
}
|
||
else
|
||
{
|
||
/* The N_SO starting this symtab is the first symbol, so we
|
||
better not check the symbol before it. I'm not this can
|
||
happen, but it doesn't hurt to check for it. */
|
||
bfd_seek (symfile_bfd, sym_offset, L_INCR);
|
||
processing_gcc_compilation = 0;
|
||
}
|
||
|
||
if (symbuf_idx == symbuf_end)
|
||
fill_symbuf (abfd);
|
||
bufp = &symbuf[symbuf_idx];
|
||
if (bufp->n_type != (unsigned char)N_SO)
|
||
error("First symbol in segment of executable not a source symbol");
|
||
|
||
max_symnum = sym_size / symbol_size;
|
||
|
||
for (symnum = 0;
|
||
symnum < max_symnum;
|
||
symnum++)
|
||
{
|
||
QUIT; /* Allow this to be interruptable */
|
||
if (symbuf_idx == symbuf_end)
|
||
fill_symbuf(abfd);
|
||
bufp = &symbuf[symbuf_idx++];
|
||
SWAP_SYMBOL (bufp, abfd);
|
||
|
||
type = bufp->n_type;
|
||
if (type == (unsigned char)N_CATCH)
|
||
{
|
||
/* N_CATCH is not fixed up by the linker, and unfortunately,
|
||
there's no other place to put it in the .stab map. */
|
||
bufp->n_value += text_offset - offset;
|
||
}
|
||
|
||
SET_NAMESTRING ();
|
||
|
||
if (type & N_STAB) {
|
||
process_one_symbol (type, bufp->n_desc, bufp->n_value,
|
||
namestring, offset);
|
||
/* our_objfile is an implicit parameter. */
|
||
}
|
||
/* We skip checking for a new .o or -l file; that should never
|
||
happen in this routine. */
|
||
else if (type == N_TEXT
|
||
&& (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0
|
||
|| strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0))
|
||
/* I don't think this code will ever be executed, because
|
||
the GCC_COMPILED_FLAG_SYMBOL usually is right before
|
||
the N_SO symbol which starts this source file.
|
||
However, there is no reason not to accept
|
||
the GCC_COMPILED_FLAG_SYMBOL anywhere. */
|
||
processing_gcc_compilation = 1;
|
||
else if (type & N_EXT || type == (unsigned char)N_TEXT
|
||
|| type == (unsigned char)N_NBTEXT
|
||
) {
|
||
/* Global symbol: see if we came across a dbx defintion for
|
||
a corresponding symbol. If so, store the value. Remove
|
||
syms from the chain when their values are stored, but
|
||
search the whole chain, as there may be several syms from
|
||
different files with the same name. */
|
||
/* This is probably not true. Since the files will be read
|
||
in one at a time, each reference to a global symbol will
|
||
be satisfied in each file as it appears. So we skip this
|
||
section. */
|
||
;
|
||
}
|
||
}
|
||
|
||
current_objfile = NULL;
|
||
return (end_symtab (text_offset + text_size, 0, 0, objfile));
|
||
}
|
||
|
||
/* This handles a single symbol from the symbol-file, building symbols
|
||
into a GDB symtab. It takes these arguments and an implicit argument.
|
||
|
||
TYPE is the type field of the ".stab" symbol entry.
|
||
DESC is the desc field of the ".stab" entry.
|
||
VALU is the value field of the ".stab" entry.
|
||
NAME is the symbol name, in our address space.
|
||
OFFSET is the amount by which this object file was relocated
|
||
when it was loaded into memory. All symbols that refer
|
||
to memory locations need to be offset by this amount.
|
||
|
||
The implicit argument is:
|
||
OUR_OBJFILE is the object file from which we are reading symbols.
|
||
It is used in end_symtab. */
|
||
|
||
void
|
||
process_one_symbol (type, desc, valu, name, offset)
|
||
int type, desc;
|
||
CORE_ADDR valu;
|
||
char *name;
|
||
int offset;
|
||
{
|
||
#ifndef SUN_FIXED_LBRAC_BUG
|
||
/* This records the last pc address we've seen. We depend on there being
|
||
an SLINE or FUN or SO before the first LBRAC, since the variable does
|
||
not get reset in between reads of different symbol files. */
|
||
static CORE_ADDR last_pc_address;
|
||
#endif
|
||
register struct context_stack *new;
|
||
char *colon_pos;
|
||
|
||
/* Something is wrong if we see real data before
|
||
seeing a source file name. */
|
||
|
||
if (last_source_file == 0 && type != (unsigned char)N_SO)
|
||
{
|
||
/* Currently this ignores N_ENTRY on Gould machines, N_NSYM on machines
|
||
where that code is defined. */
|
||
if (IGNORE_SYMBOL (type))
|
||
return;
|
||
|
||
/* FIXME, this should not be an error, since it precludes extending
|
||
the symbol table information in this way... */
|
||
error ("Invalid symbol data: does not start by identifying a source file.");
|
||
}
|
||
|
||
switch (type)
|
||
{
|
||
case N_FUN:
|
||
case N_FNAME:
|
||
#if 0
|
||
/* It seems that the Sun ANSI C compiler (acc) replaces N_FUN with N_GSYM and
|
||
N_STSYM with a type code of f or F. Can't enable this until we get some
|
||
stuff straightened out with psymtabs. */
|
||
|
||
case N_GSYM:
|
||
case N_STSYM:
|
||
#endif /* 0 */
|
||
|
||
valu += offset; /* Relocate for dynamic loading */
|
||
|
||
/* Either of these types of symbols indicates the start of
|
||
a new function. We must process its "name" normally for dbx,
|
||
but also record the start of a new lexical context, and possibly
|
||
also the end of the lexical context for the previous function. */
|
||
/* This is not always true. This type of symbol may indicate a
|
||
text segment variable. */
|
||
|
||
colon_pos = strchr (name, ':');
|
||
if (!colon_pos++
|
||
|| (*colon_pos != 'f' && *colon_pos != 'F'))
|
||
{
|
||
define_symbol (valu, name, desc, type, our_objfile);
|
||
break;
|
||
}
|
||
|
||
#ifndef SUN_FIXED_LBRAC_BUG
|
||
last_pc_address = valu; /* Save for SunOS bug circumcision */
|
||
#endif
|
||
|
||
within_function = 1;
|
||
if (context_stack_depth > 0)
|
||
{
|
||
new = pop_context ();
|
||
/* Make a block for the local symbols within. */
|
||
finish_block (new->name, &local_symbols, new->old_blocks,
|
||
new->start_addr, valu, our_objfile);
|
||
}
|
||
/* Stack must be empty now. */
|
||
if (context_stack_depth != 0)
|
||
complain (&lbrac_unmatched_complaint, (char *) symnum);
|
||
|
||
new = push_context (0, valu);
|
||
new->name = define_symbol (valu, name, desc, type, our_objfile);
|
||
break;
|
||
|
||
case N_CATCH:
|
||
/* Record the address at which this catch takes place. */
|
||
define_symbol (valu+offset, name, desc, type, our_objfile);
|
||
break;
|
||
|
||
case N_LBRAC:
|
||
/* This "symbol" just indicates the start of an inner lexical
|
||
context within a function. */
|
||
|
||
#if defined (BLOCK_ADDRESS_ABSOLUTE)
|
||
valu += offset; /* Relocate for dynamic loading */
|
||
#else
|
||
/* On most machines, the block addresses are relative to the
|
||
N_SO, the linker did not relocate them (sigh). */
|
||
valu += last_source_start_addr;
|
||
#endif
|
||
|
||
#ifndef SUN_FIXED_LBRAC_BUG
|
||
if (valu < last_pc_address) {
|
||
/* Patch current LBRAC pc value to match last handy pc value */
|
||
complain (&lbrac_complaint, 0);
|
||
valu = last_pc_address;
|
||
}
|
||
#endif
|
||
new = push_context (desc, valu);
|
||
break;
|
||
|
||
case N_RBRAC:
|
||
/* This "symbol" just indicates the end of an inner lexical
|
||
context that was started with N_LBRAC. */
|
||
|
||
#if defined (BLOCK_ADDRESS_ABSOLUTE)
|
||
valu += offset; /* Relocate for dynamic loading */
|
||
#else
|
||
/* On most machines, the block addresses are relative to the
|
||
N_SO, the linker did not relocate them (sigh). */
|
||
valu += last_source_start_addr;
|
||
#endif
|
||
|
||
new = pop_context();
|
||
if (desc != new->depth)
|
||
complain (&lbrac_mismatch_complaint, (char *) symnum);
|
||
|
||
/* Some compilers put the variable decls inside of an
|
||
LBRAC/RBRAC block. This macro should be nonzero if this
|
||
is true. DESC is N_DESC from the N_RBRAC symbol.
|
||
GCC_P is true if we've detected the GCC_COMPILED_SYMBOL
|
||
or the GCC2_COMPILED_SYMBOL. */
|
||
#if !defined (VARIABLES_INSIDE_BLOCK)
|
||
#define VARIABLES_INSIDE_BLOCK(desc, gcc_p) 0
|
||
#endif
|
||
|
||
/* Can only use new->locals as local symbols here if we're in
|
||
gcc or on a machine that puts them before the lbrack. */
|
||
if (!VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation))
|
||
local_symbols = new->locals;
|
||
|
||
/* If this is not the outermost LBRAC...RBRAC pair in the
|
||
function, its local symbols preceded it, and are the ones
|
||
just recovered from the context stack. Defined the block for them.
|
||
|
||
If this is the outermost LBRAC...RBRAC pair, there is no
|
||
need to do anything; leave the symbols that preceded it
|
||
to be attached to the function's own block. However, if
|
||
it is so, we need to indicate that we just moved outside
|
||
of the function. */
|
||
if (local_symbols
|
||
&& (context_stack_depth
|
||
> !VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation)))
|
||
{
|
||
/* FIXME Muzzle a compiler bug that makes end < start. */
|
||
if (new->start_addr > valu)
|
||
{
|
||
complain(&lbrac_rbrac_complaint, 0);
|
||
new->start_addr = valu;
|
||
}
|
||
/* Make a block for the local symbols within. */
|
||
finish_block (0, &local_symbols, new->old_blocks,
|
||
new->start_addr, valu, our_objfile);
|
||
}
|
||
else
|
||
{
|
||
within_function = 0;
|
||
}
|
||
if (VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation))
|
||
/* Now pop locals of block just finished. */
|
||
local_symbols = new->locals;
|
||
break;
|
||
|
||
case N_FN:
|
||
case N_FN_SEQ:
|
||
/* This kind of symbol indicates the start of an object file. */
|
||
valu += offset; /* Relocate for dynamic loading */
|
||
break;
|
||
|
||
case N_SO:
|
||
/* This type of symbol indicates the start of data
|
||
for one source file.
|
||
Finish the symbol table of the previous source file
|
||
(if any) and start accumulating a new symbol table. */
|
||
valu += offset; /* Relocate for dynamic loading */
|
||
|
||
#ifndef SUN_FIXED_LBRAC_BUG
|
||
last_pc_address = valu; /* Save for SunOS bug circumcision */
|
||
#endif
|
||
|
||
#ifdef PCC_SOL_BROKEN
|
||
/* pcc bug, occasionally puts out SO for SOL. */
|
||
if (context_stack_depth > 0)
|
||
{
|
||
start_subfile (name, NULL);
|
||
break;
|
||
}
|
||
#endif
|
||
if (last_source_file)
|
||
{
|
||
/* Check if previous symbol was also an N_SO (with some
|
||
sanity checks). If so, that one was actually the directory
|
||
name, and the current one is the real file name.
|
||
Patch things up. */
|
||
if (previous_stab_code == N_SO
|
||
&& current_subfile && current_subfile->dirname == NULL
|
||
&& current_subfile->name != NULL
|
||
&& current_subfile->name[strlen(current_subfile->name)-1] == '/')
|
||
{
|
||
current_subfile->dirname = current_subfile->name;
|
||
current_subfile->name =
|
||
obsavestring (name, strlen (name),
|
||
&our_objfile -> symbol_obstack);
|
||
break;
|
||
}
|
||
(void) end_symtab (valu, 0, 0, our_objfile);
|
||
}
|
||
start_symtab (name, NULL, valu);
|
||
break;
|
||
|
||
|
||
case N_SOL:
|
||
/* This type of symbol indicates the start of data for
|
||
a sub-source-file, one whose contents were copied or
|
||
included in the compilation of the main source file
|
||
(whose name was given in the N_SO symbol.) */
|
||
valu += offset; /* Relocate for dynamic loading */
|
||
start_subfile (name, NULL);
|
||
break;
|
||
|
||
case N_BINCL:
|
||
push_subfile ();
|
||
add_new_header_file (name, valu);
|
||
start_subfile (name, NULL);
|
||
break;
|
||
|
||
case N_EINCL:
|
||
start_subfile (pop_subfile (), NULL);
|
||
break;
|
||
|
||
case N_EXCL:
|
||
add_old_header_file (name, valu);
|
||
break;
|
||
|
||
case N_SLINE:
|
||
/* This type of "symbol" really just records
|
||
one line-number -- core-address correspondence.
|
||
Enter it in the line list for this symbol table. */
|
||
valu += offset; /* Relocate for dynamic loading */
|
||
#ifndef SUN_FIXED_LBRAC_BUG
|
||
last_pc_address = valu; /* Save for SunOS bug circumcision */
|
||
#endif
|
||
record_line (current_subfile, desc, valu);
|
||
break;
|
||
|
||
case N_BCOMM:
|
||
if (common_block)
|
||
error ("Invalid symbol data: common within common at symtab pos %d",
|
||
symnum);
|
||
common_block = local_symbols;
|
||
common_block_i = local_symbols ? local_symbols->nsyms : 0;
|
||
break;
|
||
|
||
case N_ECOMM:
|
||
/* Symbols declared since the BCOMM are to have the common block
|
||
start address added in when we know it. common_block points to
|
||
the first symbol after the BCOMM in the local_symbols list;
|
||
copy the list and hang it off the symbol for the common block name
|
||
for later fixup. */
|
||
{
|
||
int i;
|
||
struct symbol *sym =
|
||
(struct symbol *) xmmalloc (our_objfile -> md, sizeof (struct symbol));
|
||
bzero (sym, sizeof *sym);
|
||
SYMBOL_NAME (sym) = savestring (name, strlen (name));
|
||
SYMBOL_CLASS (sym) = LOC_BLOCK;
|
||
SYMBOL_NAMESPACE (sym) = (enum namespace)((long)
|
||
copy_pending (local_symbols, common_block_i, common_block));
|
||
i = hashname (SYMBOL_NAME (sym));
|
||
SYMBOL_VALUE_CHAIN (sym) = global_sym_chain[i];
|
||
global_sym_chain[i] = sym;
|
||
common_block = 0;
|
||
break;
|
||
}
|
||
|
||
/* The following symbol types need to have the offset added to their
|
||
value; then we process symbol definitions in the name. */
|
||
case N_STSYM: /* Global symbol */
|
||
case N_LCSYM: /* Local symbol */
|
||
case N_DSLINE: /* Source line number, data seg */
|
||
case N_BSLINE: /* Source line number, bss seg */
|
||
/* N_BROWS: overlaps with N_BSLINE */
|
||
case N_ENTRY: /* Alternate entry point */
|
||
valu += offset; /* Relocate for dynamic loading */
|
||
/* FALL THROUGH */
|
||
|
||
/* The following symbol types don't need the address field relocated,
|
||
since it is either unused, or is absolute. */
|
||
case N_GSYM: /* Global variable */
|
||
case N_NSYMS: /* Number of symbols (ultrix) */
|
||
case N_NOMAP: /* No map? (ultrix) */
|
||
case N_RSYM: /* Register variable */
|
||
case N_DEFD: /* Modula-2 GNU module dependency */
|
||
case N_SSYM: /* Struct or union element */
|
||
case N_LSYM: /* Local symbol in stack */
|
||
case N_PSYM: /* Parameter variable */
|
||
case N_LENG: /* Length of preceding symbol type */
|
||
if (name)
|
||
define_symbol (valu, name, desc, type, our_objfile);
|
||
break;
|
||
|
||
/* The following symbol types we don't know how to process. Handle
|
||
them in a "default" way, but complain to people who care. */
|
||
default:
|
||
case N_EHDECL: /* Exception handler name */
|
||
case N_MAIN: /* Name of main routine (not used in C) */
|
||
case N_PC: /* Global symbol in Pascal */
|
||
case N_M2C: /* Modula-2 compilation unit */
|
||
/* N_MOD2: overlaps with N_EHDECL */
|
||
case N_SCOPE: /* Modula-2 scope information */
|
||
case N_ECOML: /* End common (local name) */
|
||
case N_NBTEXT: /* Gould Non-Base-Register symbols??? */
|
||
case N_NBDATA:
|
||
case N_NBBSS:
|
||
case N_NBSTS:
|
||
case N_NBLCS:
|
||
complain (&unknown_symtype_complaint, local_hex_string(type));
|
||
if (name)
|
||
define_symbol (valu, name, desc, type, our_objfile);
|
||
}
|
||
|
||
previous_stab_code = type;
|
||
}
|
||
|
||
/* Copy a pending list, used to record the contents of a common
|
||
block for later fixup. */
|
||
static struct pending *
|
||
copy_pending (beg, begi, end)
|
||
struct pending *beg;
|
||
int begi;
|
||
struct pending *end;
|
||
{
|
||
struct pending *new = 0;
|
||
struct pending *next;
|
||
|
||
for (next = beg; next != 0 && (next != end || begi < end->nsyms);
|
||
next = next->next, begi = 0)
|
||
{
|
||
register int j;
|
||
for (j = begi; j < next->nsyms; j++)
|
||
add_symbol_to_list (next->symbol[j], &new);
|
||
}
|
||
return new;
|
||
}
|
||
|
||
/* Register our willingness to decode symbols for SunOS and a.out and
|
||
b.out files handled by BFD... */
|
||
static struct sym_fns sunos_sym_fns =
|
||
{
|
||
"sunOs", /* sym_name: name or name prefix of BFD target type */
|
||
6, /* sym_namelen: number of significant sym_name chars */
|
||
dbx_new_init, /* sym_new_init: init anything gbl to entire symtab */
|
||
dbx_symfile_init, /* sym_init: read initial info, setup for sym_read() */
|
||
dbx_symfile_read, /* sym_read: read a symbol file into symtab */
|
||
dbx_symfile_finish, /* sym_finish: finished with file, cleanup */
|
||
NULL /* next: pointer to next struct sym_fns */
|
||
};
|
||
|
||
static struct sym_fns aout_sym_fns =
|
||
{
|
||
"a.out", /* sym_name: name or name prefix of BFD target type */
|
||
5, /* sym_namelen: number of significant sym_name chars */
|
||
dbx_new_init, /* sym_new_init: init anything gbl to entire symtab */
|
||
dbx_symfile_init, /* sym_init: read initial info, setup for sym_read() */
|
||
dbx_symfile_read, /* sym_read: read a symbol file into symtab */
|
||
dbx_symfile_finish, /* sym_finish: finished with file, cleanup */
|
||
NULL /* next: pointer to next struct sym_fns */
|
||
};
|
||
|
||
static struct sym_fns bout_sym_fns =
|
||
{
|
||
"b.out", /* sym_name: name or name prefix of BFD target type */
|
||
5, /* sym_namelen: number of significant sym_name chars */
|
||
dbx_new_init, /* sym_new_init: init anything gbl to entire symtab */
|
||
dbx_symfile_init, /* sym_init: read initial info, setup for sym_read() */
|
||
dbx_symfile_read, /* sym_read: read a symbol file into symtab */
|
||
dbx_symfile_finish, /* sym_finish: finished with file, cleanup */
|
||
NULL /* next: pointer to next struct sym_fns */
|
||
};
|
||
|
||
void
|
||
_initialize_dbxread ()
|
||
{
|
||
add_symtab_fns(&sunos_sym_fns);
|
||
add_symtab_fns(&aout_sym_fns);
|
||
add_symtab_fns(&bout_sym_fns);
|
||
}
|