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- /* Read dbx symbol tables and convert to internal format, for GDB.
- Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993
- Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* This module provides three functions: dbx_symfile_init,
- which initializes to read a symbol file; dbx_new_init, which
- discards existing cached information when all symbols are being
- discarded; and dbx_symfile_read, which reads a symbol table
- from a file.
-
- dbx_symfile_read only does the minimum work necessary for letting the
- user "name" things symbolically; it does not read the entire symtab.
- Instead, it reads the external and static symbols and puts them in partial
- symbol tables. When more extensive information is requested of a
- file, the corresponding partial symbol table is mutated into a full
- fledged symbol table by going back and reading the symbols
- for real. dbx_psymtab_to_symtab() is the function that does this */
-
- #include "defs.h"
- #include <string.h>
-
- #if defined(USG) || defined(__CYGNUSCLIB__)
- #include <sys/types.h>
- #include <fcntl.h>
- #define L_SET 0
- #define L_INCR 1
- #endif
-
- #include <obstack.h>
- #include <sys/param.h>
- #ifndef NO_SYS_FILE
- #include <sys/file.h>
- #endif
- #include <sys/stat.h>
- #include <ctype.h>
- #include "symtab.h"
- #include "breakpoint.h"
- #include "command.h"
- #include "target.h"
- #include "gdbcore.h" /* for bfd stuff */
- #include "libbfd.h" /* FIXME Secret internal BFD stuff (bfd_read) */
- #include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */
- #include "symfile.h"
- #include "objfiles.h"
- #include "buildsym.h"
- #include "stabsread.h"
- #include "gdb-stabs.h"
- #include "demangle.h"
- #include "language.h" /* Needed inside partial-stab.h */
- #include "complaints.h"
-
- #include "aout/aout64.h"
- #include "aout/stab_gnu.h" /* We always use GNU stabs, not native, now */
-
- /* Each partial symbol table entry contains a pointer to private data for the
- read_symtab() function to use when expanding a partial symbol table entry
- to a full symbol table entry.
-
- For dbxread this structure contains the offset within the file symbol table
- of first local symbol for this file, and length (in bytes) of the section
- of the symbol table devoted to this file's symbols (actually, the section
- bracketed may contain more than just this file's symbols). It also contains
- further information needed to locate the symbols if they are in an ELF file.
-
- If ldsymlen is 0, the only reason for this thing's existence is the
- dependency list. Nothing else will happen when it is read in. */
-
- #define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff)
- #define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen)
- #define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private))
- #define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size)
- #define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset)
- #define STRING_OFFSET(p) (SYMLOC(p)->string_offset)
- #define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset)
-
- struct symloc {
- int ldsymoff;
- int ldsymlen;
- int symbol_size;
- int symbol_offset;
- int string_offset;
- int file_string_offset;
- };
-
- /* Macro to determine which symbols to ignore when reading the first symbol
- of a file. Some machines override this definition. */
- #ifndef IGNORE_SYMBOL
- /* This code is used on Ultrix systems. Ignore it */
- #define IGNORE_SYMBOL(type) (type == (int)N_NSYMS)
- #endif
-
- /* Macro for name of symbol to indicate a file compiled with gcc. */
- #ifndef GCC_COMPILED_FLAG_SYMBOL
- #define GCC_COMPILED_FLAG_SYMBOL "gcc_compiled."
- #endif
-
- /* Macro for name of symbol to indicate a file compiled with gcc2. */
- #ifndef GCC2_COMPILED_FLAG_SYMBOL
- #define GCC2_COMPILED_FLAG_SYMBOL "gcc2_compiled."
- #endif
-
- /* Define this as 1 if a pcc declaration of a char or short argument
- gives the correct address. Otherwise assume pcc gives the
- address of the corresponding int, which is not the same on a
- big-endian machine. */
-
- #ifndef BELIEVE_PCC_PROMOTION
- #define BELIEVE_PCC_PROMOTION 0
- #endif
-
- /* Remember what we deduced to be the source language of this psymtab. */
-
- static enum language psymtab_language = language_unknown;
-
- /* Nonzero means give verbose info on gdb action. From main.c. */
- extern int info_verbose;
-
- /* The BFD for this file -- implicit parameter to next_symbol_text. */
-
- static bfd *symfile_bfd;
-
- /* The size of each symbol in the symbol file (in external form).
- This is set by dbx_symfile_read when building psymtabs, and by
- dbx_psymtab_to_symtab when building symtabs. */
-
- static unsigned symbol_size;
-
- /* This is the offset of the symbol table in the executable file */
- static unsigned symbol_table_offset;
-
- /* This is the offset of the string table in the executable file */
- static unsigned string_table_offset;
-
- /* For elf+stab executables, the n_strx field is not a simple index
- into the string table. Instead, each .o file has a base offset
- in the string table, and the associated symbols contain offsets
- from this base. The following two variables contain the base
- offset for the current and next .o files. */
- static unsigned int file_string_table_offset;
- static unsigned int next_file_string_table_offset;
-
- /* Complaints about the symbols we have encountered. */
-
- struct complaint lbrac_complaint =
- {"bad block start address patched", 0, 0};
-
- struct complaint string_table_offset_complaint =
- {"bad string table offset in symbol %d", 0, 0};
-
- struct complaint unknown_symtype_complaint =
- {"unknown symbol type %s", 0, 0};
-
- struct complaint unknown_symchar_complaint =
- {"unknown symbol type character `%c'", 0, 0};
-
- struct complaint lbrac_rbrac_complaint =
- {"block start larger than block end", 0, 0};
-
- struct complaint lbrac_unmatched_complaint =
- {"unmatched N_LBRAC before symtab pos %d", 0, 0};
-
- struct complaint lbrac_mismatch_complaint =
- {"N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d", 0, 0};
-
- struct complaint repeated_header_complaint =
- {"\"repeated\" header file not previously seen, at symtab pos %d", 0, 0};
-
- struct complaint repeated_header_name_complaint =
- {"\"repeated\" header file not previously seen, named %s", 0, 0};
-
- /* During initial symbol readin, we need to have a structure to keep
- track of which psymtabs have which bincls in them. This structure
- is used during readin to setup the list of dependencies within each
- partial symbol table. */
-
- struct header_file_location
- {
- char *name; /* Name of header file */
- int instance; /* See above */
- struct partial_symtab *pst; /* Partial symtab that has the
- BINCL/EINCL defs for this file */
- };
-
- /* The actual list and controling variables */
- static struct header_file_location *bincl_list, *next_bincl;
- static int bincls_allocated;
-
- /* Local function prototypes */
-
- static void
- free_header_files PARAMS ((void));
-
- static void
- init_header_files PARAMS ((void));
-
- static struct pending *
- copy_pending PARAMS ((struct pending *, int, struct pending *));
-
- static struct symtab *
- read_ofile_symtab PARAMS ((struct objfile *, int, int, CORE_ADDR, int,
- struct section_offsets *));
-
- static void
- dbx_psymtab_to_symtab PARAMS ((struct partial_symtab *));
-
- static void
- dbx_psymtab_to_symtab_1 PARAMS ((struct partial_symtab *));
-
- static void
- read_dbx_symtab PARAMS ((struct section_offsets *, struct objfile *,
- CORE_ADDR, int));
-
- static void
- free_bincl_list PARAMS ((struct objfile *));
-
- static struct partial_symtab *
- find_corresponding_bincl_psymtab PARAMS ((char *, int));
-
- static void
- add_bincl_to_list PARAMS ((struct partial_symtab *, char *, int));
-
- static void
- init_bincl_list PARAMS ((int, struct objfile *));
-
- static void
- init_psymbol_list PARAMS ((struct objfile *));
-
- static char *
- dbx_next_symbol_text PARAMS ((void));
-
- static void
- fill_symbuf PARAMS ((bfd *));
-
- static void
- dbx_symfile_init PARAMS ((struct objfile *));
-
- static void
- dbx_new_init PARAMS ((struct objfile *));
-
- static void
- dbx_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));
-
- static void
- dbx_symfile_finish PARAMS ((struct objfile *));
-
- static void
- record_minimal_symbol PARAMS ((char *, CORE_ADDR, int, struct objfile *));
-
- static void
- add_new_header_file PARAMS ((char *, int));
-
- static void
- add_old_header_file PARAMS ((char *, int));
-
- static void
- add_this_object_header_file PARAMS ((int));
-
- /* Free up old header file tables */
-
- static void
- free_header_files ()
- {
- register int i;
-
- if (header_files != NULL)
- {
- for (i = 0; i < n_header_files; i++)
- {
- free (header_files[i].name);
- }
- free ((PTR)header_files);
- header_files = NULL;
- n_header_files = 0;
- }
- if (this_object_header_files)
- {
- free ((PTR)this_object_header_files);
- this_object_header_files = NULL;
- }
- n_allocated_header_files = 0;
- n_allocated_this_object_header_files = 0;
- }
-
- /* Allocate new header file tables */
-
- static void
- init_header_files ()
- {
- n_header_files = 0;
- n_allocated_header_files = 10;
- header_files = (struct header_file *)
- xmalloc (10 * sizeof (struct header_file));
-
- n_allocated_this_object_header_files = 10;
- this_object_header_files = (int *) xmalloc (10 * sizeof (int));
- }
-
- /* Add header file number I for this object file
- at the next successive FILENUM. */
-
- static void
- add_this_object_header_file (i)
- int i;
- {
- if (n_this_object_header_files == n_allocated_this_object_header_files)
- {
- n_allocated_this_object_header_files *= 2;
- this_object_header_files
- = (int *) xrealloc ((char *) this_object_header_files,
- n_allocated_this_object_header_files * sizeof (int));
- }
-
- this_object_header_files[n_this_object_header_files++] = i;
- }
-
- /* Add to this file an "old" header file, one already seen in
- a previous object file. NAME is the header file's name.
- INSTANCE is its instance code, to select among multiple
- symbol tables for the same header file. */
-
- static void
- add_old_header_file (name, instance)
- char *name;
- int instance;
- {
- register struct header_file *p = header_files;
- register int i;
-
- for (i = 0; i < n_header_files; i++)
- if (STREQ (p[i].name, name) && instance == p[i].instance)
- {
- add_this_object_header_file (i);
- return;
- }
- complain (&repeated_header_complaint, symnum);
- complain (&repeated_header_name_complaint, name);
- }
-
- /* Add to this file a "new" header file: definitions for its types follow.
- NAME is the header file's name.
- Most often this happens only once for each distinct header file,
- but not necessarily. If it happens more than once, INSTANCE has
- a different value each time, and references to the header file
- use INSTANCE values to select among them.
-
- dbx output contains "begin" and "end" markers for each new header file,
- but at this level we just need to know which files there have been;
- so we record the file when its "begin" is seen and ignore the "end". */
-
- static void
- add_new_header_file (name, instance)
- char *name;
- int instance;
- {
- register int i;
-
- /* Make sure there is room for one more header file. */
-
- if (n_header_files == n_allocated_header_files)
- {
- n_allocated_header_files *= 2;
- header_files = (struct header_file *)
- xrealloc ((char *) header_files,
- (n_allocated_header_files * sizeof (struct header_file)));
- }
-
- /* Create an entry for this header file. */
-
- i = n_header_files++;
- header_files[i].name = savestring (name, strlen(name));
- header_files[i].instance = instance;
- header_files[i].length = 10;
- header_files[i].vector
- = (struct type **) xmalloc (10 * sizeof (struct type *));
- memset (header_files[i].vector, 0, 10 * sizeof (struct type *));
-
- add_this_object_header_file (i);
- }
-
- #if 0
- static struct type **
- explicit_lookup_type (real_filenum, index)
- int real_filenum, index;
- {
- register struct header_file *f = &header_files[real_filenum];
-
- if (index >= f->length)
- {
- f->length *= 2;
- f->vector = (struct type **)
- xrealloc (f->vector, f->length * sizeof (struct type *));
- bzero (&f->vector[f->length / 2],
- f->length * sizeof (struct type *) / 2);
- }
- return &f->vector[index];
- }
- #endif
-
- static void
- record_minimal_symbol (name, address, type, objfile)
- char *name;
- CORE_ADDR address;
- int type;
- struct objfile *objfile;
- {
- enum minimal_symbol_type ms_type;
-
- switch (type &~ N_EXT) {
- case N_TEXT: ms_type = mst_text; break;
- case N_DATA: ms_type = mst_data; break;
- case N_BSS: ms_type = mst_bss; break;
- case N_ABS: ms_type = mst_abs; break;
- #ifdef N_SETV
- 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),
- address, ms_type);
- }
-
- /* 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.
-
- SECTION_OFFSETS contains offsets relative to which the symbols in the
- various sections are (depending where the sections were actually loaded).
- 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, section_offsets, mainline)
- struct objfile *objfile;
- struct section_offsets *section_offsets;
- 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);
-
- symbol_size = DBX_SYMBOL_SIZE (objfile);
- symbol_table_offset = DBX_SYMTAB_OFFSET (objfile);
-
- 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. */
-
- read_dbx_symtab (section_offsets, 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;
- {
- stabsread_new_init ();
- 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. */
-
- #define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */
-
- 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[DBX_STRINGTAB_SIZE_SIZE];
-
- /* 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_SYMFILE_INFO (objfile)->stab_section_info = NULL;
- DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
- if (!DBX_TEXT_SECT (objfile))
- error ("Can't find .text section in symbol file");
-
- DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd);
- DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd);
- DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
-
- /* 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 less than the size of
- the size field itself, or larger than the size of the entire file.
- Note that all valid string tables have a size greater than zero, since
- the bytes used to hold the size are included in the count. */
-
- if (STRING_TABLE_OFFSET == 0)
- {
- /* It appears that with the existing bfd code, STRING_TABLE_OFFSET
- will never be zero, even when there is no string table. This
- would appear to be a bug in bfd. */
- DBX_STRINGTAB_SIZE (objfile) = 0;
- DBX_STRINGTAB (objfile) = NULL;
- }
- else
- {
- val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET);
- if (val < 0)
- perror_with_name (name);
-
- memset ((PTR) size_temp, 0, sizeof (size_temp));
- val = bfd_read ((PTR) size_temp, sizeof (size_temp), 1, sym_bfd);
- if (val < 0)
- {
- perror_with_name (name);
- }
- else if (val == 0)
- {
- /* With the existing bfd code, STRING_TABLE_OFFSET will be set to
- EOF if there is no string table, and attempting to read the size
- from EOF will read zero bytes. */
- DBX_STRINGTAB_SIZE (objfile) = 0;
- DBX_STRINGTAB (objfile) = NULL;
- }
- else
- {
- /* Read some data that would appear to be the string table size.
- If there really is a string table, then it is probably the right
- size. Byteswap if necessary and validate the size. Note that
- the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some
- random data that happened to be at STRING_TABLE_OFFSET, because
- bfd can't tell us there is no string table, the sanity checks may
- or may not catch this. */
- DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp);
-
- if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp)
- || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
- 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);
- }
- }
- }
-
- /* 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;
-
- /* Name of last function encountered. Used in Solaris to approximate
- object file boundaries. */
- static char *last_function_name;
-
- /* 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
- + file_string_table_offset;
- }
-
- /* 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
- && STREQ (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 SECTION_OFFSETS is the set of offsets for the various sections
- of the file (a set of zeros if the mainline program). */
-
- static void
- read_dbx_symtab (section_offsets, objfile, text_addr, text_size)
- struct section_offsets *section_offsets;
- 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;
-
- /* FIXME. We probably want to change stringtab_global rather than add this
- while processing every symbol entry. FIXME. */
- file_string_table_offset = 0;
- next_file_string_table_offset = 0;
-
- 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 = NULL;
-
- #ifdef END_OF_TEXT_DEFAULT
- end_of_text_addr = END_OF_TEXT_DEFAULT;
- #else
- end_of_text_addr = text_addr + section_offsets->offsets[SECT_OFF_TEXT]
- + 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. */
-
- /*FIXME: Too many adds and indirections in here for the inner loop. */
- #define SET_NAMESTRING()\
- if (((unsigned)bufp->n_strx + file_string_table_offset) >= \
- DBX_STRINGTAB_SIZE (objfile)) { \
- complain (&string_table_offset_complaint, symnum); \
- namestring = "foo"; \
- } else \
- namestring = bufp->n_strx + file_string_table_offset + \
- DBX_STRINGTAB (objfile)
-
- #define CUR_SYMBOL_TYPE bufp->n_type
- #define CUR_SYMBOL_VALUE bufp->n_value
- #define DBXREAD_ONLY
- #define START_PSYMTAB(ofile,secoff,fname,low,symoff,global_syms,static_syms)\
- start_psymtab(ofile, secoff, 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 */
- /*FIXME, does this have a bug at start address 0? */
- && last_o_file_start
- && 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, section_offsets,
- filename, textlow, ldsymoff, global_syms, static_syms)
- struct objfile *objfile;
- struct section_offsets *section_offsets;
- 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, section_offsets,
- 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;
- SYMBOL_SIZE(result) = symbol_size;
- SYMBOL_OFFSET(result) = symbol_table_offset;
- STRING_OFFSET(result) = string_table_offset;
- FILE_STRING_OFFSET(result) = file_string_table_offset;
-
- /* If we're handling an ELF file, drag some section-relocation info
- for this source file out of the ELF symbol table, to compensate for
- Sun brain death. This replaces the section_offsets in this psymtab,
- if successful. */
- elfstab_offset_sections (objfile, result);
-
- /* Deduce the source language from the filename for this psymtab. */
- psymtab_language = deduce_language_from_filename (filename);
-
- 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 partial_symtab *p1;
- struct objfile *objfile = pst -> objfile;
-
- if (capping_symbol_offset != -1)
- LDSYMLEN(pst) = capping_symbol_offset - LDSYMOFF(pst);
- pst->texthigh = capping_text;
-
- /* Under Solaris, the N_SO symbols always have a value of 0,
- instead of the usual address of the .o file. Therefore,
- we have to do some tricks to fill in texthigh and textlow.
- The first trick is in partial-stab.h: if we see a static
- or global function, and the textlow for the current pst
- is still 0, then we use that function's address for
- the textlow of the pst.
-
- Now, to fill in texthigh, we remember the last function seen
- in the .o file (also in partial-stab.h). Also, there's a hack in
- bfd/elf.c and gdb/elfread.c to pass the ELF st_size field
- to here via the misc_info field. Therefore, we can fill in
- a reliable texthigh by taking the address plus size of the
- last function in the file.
-
- Unfortunately, that does not cover the case where the last function
- in the file is static. See the paragraph below for more comments
- on this situation.
-
- Finally, if we have a valid textlow for the current file, we run
- down the partial_symtab_list filling in previous texthighs that
- are still unknown. */
-
- if (pst->texthigh == 0 && last_function_name) {
- char *p;
- int n;
- struct minimal_symbol *minsym;
-
- p = strchr (last_function_name, ':');
- if (p == NULL)
- p = last_function_name;
- n = p - last_function_name;
- p = alloca (n + 1);
- strncpy (p, last_function_name, n);
- p[n] = 0;
-
- minsym = lookup_minimal_symbol (p, objfile);
-
- if (minsym) {
- pst->texthigh = SYMBOL_VALUE_ADDRESS (minsym) +
- (int) MSYMBOL_INFO (minsym);
- } else {
- /* This file ends with a static function, and it's
- difficult to imagine how hard it would be to track down
- the elf symbol. Luckily, most of the time no one will notice,
- since the next file will likely be compiled with -g, so
- the code below will copy the first fuction's start address
- back to our texthigh variable. (Also, if this file is the
- last one in a dynamically linked program, texthigh already
- has the right value.) If the next file isn't compiled
- with -g, then the last function in this file winds up owning
- all of the text space up to the next -g file, or the end (minus
- shared libraries). This only matters for single stepping,
- and even then it will still work, except that it will single
- step through all of the covered functions, instead of setting
- breakpoints around them as it usualy does. This makes it
- pretty slow, but at least it doesn't fail.
-
- We can fix this with a fairly big change to bfd, but we need
- to coordinate better with Cygnus if we want to do that. FIXME. */
- }
- last_function_name = NULL;
- }
-
- /* this test will be true if the last .o file is only data */
- if (pst->textlow == 0)
- pst->textlow = pst->texthigh;
-
- /* If we know our own starting text address, then walk through all other
- psymtabs for this objfile, and if any didn't know their ending text
- address, set it to our starting address. Take care to not set our
- own ending address to our starting address, nor to set addresses on
- `dependency' files that have both textlow and texthigh zero. */
- if (pst->textlow) {
- ALL_OBJFILE_PSYMTABS (objfile, p1) {
- if (p1->texthigh == 0 && p1->textlow != 0 && p1 != pst) {
- p1->texthigh = pst->textlow;
- /* if this file has only data, then make textlow match texthigh */
- if (p1->textlow == 0)
- p1->textlow = p1->texthigh;
- }
- }
- }
-
- /* End of kludge for patching Solaris textlow and texthigh. */
-
-
- 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->section_offsets = pst->section_offsets;
- 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 = pst->read_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
- dbx_psymtab_to_symtab_1 (pst)
- struct partial_symtab *pst;
- {
- 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);
- }
- dbx_psymtab_to_symtab_1 (pst->dependencies[i]);
- }
-
- if (LDSYMLEN(pst)) /* Otherwise it's a dummy */
- {
- /* Init stuff necessary for reading in symbols */
- stabsread_init ();
- buildsym_init ();
- old_chain = make_cleanup (really_free_pendings, 0);
- file_string_table_offset = FILE_STRING_OFFSET (pst);
- symbol_size = SYMBOL_SIZE (pst);
-
- /* Read in this file's symbols */
- bfd_seek (pst->objfile->obfd, SYMBOL_OFFSET (pst), L_SET);
- pst->symtab =
- read_ofile_symtab (pst->objfile, LDSYMOFF(pst), LDSYMLEN(pst),
- pst->textlow, pst->texthigh - pst->textlow,
- pst->section_offsets);
- 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;
-
- next_symbol_text_func = dbx_next_symbol_text;
-
- dbx_psymtab_to_symtab_1 (pst);
-
- /* 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.
- SECTION_OFFSETS are the relocation offsets which get added to each symbol. */
-
- static struct symtab *
- read_ofile_symtab (objfile, sym_offset, sym_size, text_offset, text_size,
- section_offsets)
- struct objfile *objfile;
- int sym_offset;
- int sym_size;
- CORE_ADDR text_offset;
- int text_size;
- struct section_offsets *section_offsets;
- {
- register char *namestring;
- register struct internal_nlist *bufp;
- unsigned char type;
- unsigned max_symnum;
- register bfd *abfd;
- struct symtab *rtn;
-
- current_objfile = objfile;
- subfile_stack = NULL;
-
- stringtab_global = DBX_STRINGTAB (objfile);
- last_source_file = NULL;
-
- abfd = objfile->obfd;
- symfile_bfd = objfile->obfd; /* Implicit param to next_text_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 (!processing_acc_compilation && 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 = 0;
- if (bufp->n_type == N_TEXT)
- {
- if (STREQ (namestring, GCC_COMPILED_FLAG_SYMBOL))
- processing_gcc_compilation = 1;
- else if (STREQ (namestring, GCC2_COMPILED_FLAG_SYMBOL))
- processing_gcc_compilation = 2;
- }
-
- /* Try to select a C++ demangling based on the compilation unit
- producer. */
-
- if (processing_gcc_compilation)
- {
- #if 1 /* Works, but is experimental. -fnf */
- if (AUTO_DEMANGLING)
- {
- set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
- }
- #endif
- }
- }
- 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;
-
- SET_NAMESTRING ();
-
- if (type & N_STAB) {
- process_one_symbol (type, bufp->n_desc, bufp->n_value,
- namestring, section_offsets, objfile);
- }
- /* We skip checking for a new .o or -l file; that should never
- happen in this routine. */
- else if (type == N_TEXT)
- {
- /* 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. */
-
- if (STREQ (namestring, GCC_COMPILED_FLAG_SYMBOL))
- processing_gcc_compilation = 1;
- else if (STREQ (namestring, GCC2_COMPILED_FLAG_SYMBOL))
- processing_gcc_compilation = 2;
-
- #if 1 /* Works, but is experimental. -fnf */
- if (AUTO_DEMANGLING)
- {
- set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
- }
- #endif
- }
- 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;
-
- /* In a Solaris elf file, this variable, which comes from the
- value of the N_SO symbol, will still be 0. Luckily, text_offset,
- which comes from pst->textlow is correct. */
- if (last_source_start_addr == 0)
- last_source_start_addr = text_offset;
-
- rtn = end_symtab (text_offset + text_size, 0, 0, objfile, SECT_OFF_TEXT);
- end_stabs ();
- return (rtn);
- }
-
- /* 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.
- SECTION_OFFSETS is a set of amounts by which the sections of this object
- file were relocated when it was loaded into memory.
- All symbols that refer
- to memory locations need to be offset by these amounts.
- 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, section_offsets, objfile)
- int type, desc;
- CORE_ADDR valu;
- char *name;
- struct section_offsets *section_offsets;
- struct objfile *objfile;
- {
- #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;
- /* This remembers the address of the start of a function. It is used
- because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries are
- relative to the current function's start address. On systems
- other than Solaris 2, this just holds the SECT_OFF_TEXT value, and is
- used to relocate these symbol types rather than SECTION_OFFSETS. */
- static CORE_ADDR function_start_offset;
- char *colon_pos;
-
- #ifndef BLOCK_ADDRESS_FUNCTION_RELATIVE
- /* N_LBRAC, N_RBRAC and N_SLINE entries are not relative to the
- function start address, so just use the text offset. */
- function_start_offset = ANOFFSET (section_offsets, SECT_OFF_TEXT);
- #endif
-
- /* Something is wrong if we see real data before
- seeing a source file name. */
-
- if (last_source_file == NULL && 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. FIXME. */
-
- case N_GSYM:
- case N_STSYM:
- #endif /* 0 */
-
- /* Relocate for dynamic loading */
- valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
-
- /* 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, objfile);
- break;
- }
-
- #ifndef SUN_FIXED_LBRAC_BUG
- last_pc_address = valu; /* Save for SunOS bug circumcision */
- #endif
-
- #ifdef BLOCK_ADDRESS_FUNCTION_RELATIVE
- /* On Solaris 2.0 compilers, the block addresses and N_SLINE's
- are relative to the start of the function. On normal systems,
- and when using gcc on Solaris 2.0, these addresses are just
- absolute, or relative to the N_SO, depending on
- BLOCK_ADDRESS_ABSOLUTE. */
- function_start_offset = valu;
- #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, objfile);
- }
- /* Stack must be empty now. */
- if (context_stack_depth != 0)
- complain (&lbrac_unmatched_complaint, symnum);
-
- new = push_context (0, valu);
- new->name = define_symbol (valu, name, desc, type, objfile);
- break;
-
- case N_LBRAC:
- /* This "symbol" just indicates the start of an inner lexical
- context within a function. */
-
- #if defined(BLOCK_ADDRESS_ABSOLUTE) || defined(BLOCK_ADDRESS_FUNCTION_RELATIVE)
- /* Relocate for dynamic loading and Sun ELF acc fn-relative syms. */
- valu += function_start_offset;
- #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);
- 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) || defined(BLOCK_ADDRESS_FUNCTION_RELATIVE)
- /* Relocate for dynamic loading and Sun ELF acc fn-relative syms. */
- valu += function_start_offset;
- #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, 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);
- new->start_addr = valu;
- }
- /* Make a block for the local symbols within. */
- finish_block (0, &local_symbols, new->old_blocks,
- new->start_addr, valu, 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. */
- /* Relocate for dynamic loading */
- valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
- 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. */
- /* Relocate for dynamic loading */
- valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
-
- #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 == (unsigned char) N_SO)
- {
- patch_subfile_names (current_subfile, name);
- break; /* Ignore repeated SOs */
- }
- end_symtab (valu, 0, 0, objfile, SECT_OFF_TEXT);
- end_stabs ();
- }
- start_stabs ();
- 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.) */
- /* Relocate for dynamic loading */
- valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
- start_subfile (name, current_subfile->dirname);
- break;
-
- case N_BINCL:
- push_subfile ();
- add_new_header_file (name, valu);
- start_subfile (name, current_subfile->dirname);
- break;
-
- case N_EINCL:
- start_subfile (pop_subfile (), current_subfile->dirname);
- 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. */
- /* Relocate for dynamic loading and for ELF acc fn-relative syms. */
- valu += function_start_offset;
- #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 (objfile -> md, sizeof (struct symbol));
- memset (sym, 0, 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 appropriate offset added
- to their value; then we process symbol definitions in the name. */
-
- case N_STSYM: /* Static symbol in data seg */
- case N_LCSYM: /* Static symbol in BSS seg */
- case N_ROSYM: /* Static symbol in Read-only data seg */
- /* HORRID HACK DEPT. However, it's Sun's furgin' fault. FIXME.
- Solaris2's stabs-in-coff makes *most* symbols relative
- but leaves a few absolute. N_STSYM and friends sit on the fence.
- .stab "foo:S...",N_STSYM is absolute (ld relocates it)
- .stab "foo:V...",N_STSYM is relative (section base subtracted).
- This leaves us no choice but to search for the 'S' or 'V'...
- (or pass the whole section_offsets stuff down ONE MORE function
- call level, which we really don't want to do). */
- {
- char *p;
- p = strchr (name, ':');
- if (p != 0 && p[1] == 'S')
- {
- /* FIXME! We relocate it by the TEXT offset, in case the
- whole module moved in memory. But this is wrong, since
- the sections can side around independently. */
- valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
- goto define_a_symbol;
- }
- /* Since it's not the kludge case, re-dispatch to the right handler. */
- switch (type) {
- case N_STSYM: goto case_N_STSYM;
- case N_LCSYM: goto case_N_LCSYM;
- case N_ROSYM: goto case_N_ROSYM;
- default: abort();
- }
- }
-
- case_N_STSYM: /* Static symbol in data seg */
- case N_DSLINE: /* Source line number, data seg */
- valu += ANOFFSET (section_offsets, SECT_OFF_DATA);
- goto define_a_symbol;
-
- case_N_LCSYM: /* Static symbol in BSS seg */
- case N_BSLINE: /* Source line number, bss seg */
- /* N_BROWS: overlaps with N_BSLINE */
- valu += ANOFFSET (section_offsets, SECT_OFF_BSS);
- goto define_a_symbol;
-
- case_N_ROSYM: /* Static symbol in Read-only data seg */
- valu += ANOFFSET (section_offsets, SECT_OFF_RODATA);
- goto define_a_symbol;
-
- case N_ENTRY: /* Alternate entry point */
- /* Relocate for dynamic loading */
- valu += ANOFFSET (section_offsets, SECT_OFF_TEXT);
- goto define_a_symbol;
-
- /* The following symbol types don't need the address field relocated,
- since it is either unused, or is absolute. */
- define_a_symbol:
- 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, objfile);
- break;
-
- /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it
- for a bunch of other flags, too. Someday we may parse their
- flags; for now we ignore theirs and hope they'll ignore ours. */
- case N_OPT: /* Solaris 2: Compiler options */
- if (name)
- {
- if (STREQ (name, GCC2_COMPILED_FLAG_SYMBOL))
- {
- processing_gcc_compilation = 2;
- #if 1 /* Works, but is experimental. -fnf */
- if (AUTO_DEMANGLING)
- {
- set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
- }
- #endif
- }
- }
- break;
-
- /* The following symbol types can be ignored. */
- case N_OBJ: /* Solaris 2: Object file dir and name */
- /* N_UNDF: Solaris 2: file separator mark */
- /* N_UNDF: -- we will never encounter it, since we only process one
- file's symbols at once. */
- case N_ENDM: /* Solaris 2: End of module */
- case N_MAIN: /* Name of main routine. */
- 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_CATCH: /* Exception handler catcher */
- case N_EHDECL: /* Exception handler name */
- 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, 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;
- }
-
- /* Scan and build partial symbols for an ELF symbol file.
- This ELF file has already been processed to get its minimal symbols,
- and any DWARF symbols that were in it.
-
- This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
- rolled into one.
-
- OBJFILE is the object file we are reading symbols from.
- ADDR is the address relative to which the symbols 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).
- STABOFFSET and STABSIZE define the location in OBJFILE where the .stab
- section exists.
- STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
- .stabstr section exists.
-
- This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
- adjusted for elf details. */
-
- void
- elfstab_build_psymtabs (objfile, section_offsets, mainline,
- staboffset, stabsize,
- stabstroffset, stabstrsize)
- struct objfile *objfile;
- struct section_offsets *section_offsets;
- int mainline;
- file_ptr staboffset;
- unsigned int stabsize;
- file_ptr stabstroffset;
- unsigned int stabstrsize;
- {
- int val;
- bfd *sym_bfd = objfile->obfd;
- char *name = bfd_get_filename (sym_bfd);
- struct dbx_symfile_info *info;
-
- /* There is already a dbx_symfile_info allocated by our caller.
- It might even contain some info from the ELF symtab to help us. */
- info = (struct dbx_symfile_info *) objfile->sym_private;
-
- DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
- if (!DBX_TEXT_SECT (objfile))
- error ("Can't find .text section in symbol file");
-
- #define ELF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */
- DBX_SYMBOL_SIZE (objfile) = ELF_STABS_SYMBOL_SIZE;
- DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile);
- DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
- DBX_SYMTAB_OFFSET (objfile) = staboffset;
-
- if (stabstrsize < 0 /* FIXME: stabstrsize is unsigned; never true! */
- || stabstrsize > bfd_get_size (sym_bfd))
- error ("ridiculous string table size: %d bytes", stabstrsize);
- DBX_STRINGTAB (objfile) = (char *)
- obstack_alloc (&objfile->psymbol_obstack, stabstrsize+1);
-
- /* Now read in the string table in one big gulp. */
-
- val = bfd_seek (sym_bfd, stabstroffset, L_SET);
- if (val < 0)
- perror_with_name (name);
- val = bfd_read (DBX_STRINGTAB (objfile), stabstrsize, 1, sym_bfd);
- if (val != stabstrsize)
- perror_with_name (name);
-
- stabsread_new_init ();
- buildsym_new_init ();
- free_header_files ();
- init_header_files ();
- install_minimal_symbols (objfile);
-
- processing_acc_compilation = 1;
-
- /* In an elf file, we've already installed the minimal symbols that came
- from the elf (non-stab) symbol table, so always act like an
- incremental load here. */
- dbx_symfile_read (objfile, section_offsets, 0);
- }
-
- /* Scan and build partial symbols for a PA symbol file.
- This PA file has already been processed to get its minimal symbols.
-
- OBJFILE is the object file we are reading symbols from.
- ADDR is the address relative to which the symbols 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).
-
- */
-
- void
- pastab_build_psymtabs (objfile, section_offsets, mainline)
- struct objfile *objfile;
- struct section_offsets *section_offsets;
- int mainline;
- {
- free_header_files ();
- init_header_files ();
-
- /* In a PA file, we've already installed the minimal symbols that came
- from the PA (non-stab) symbol table, so always act like an
- incremental load here. */
-
- dbx_symfile_read (objfile, section_offsets, mainline);
- }
-
- /* Parse the user's idea of an offset for dynamic linking, into our idea
- of how to represent it for fast symbol reading. */
-
- static struct section_offsets *
- dbx_symfile_offsets (objfile, addr)
- struct objfile *objfile;
- CORE_ADDR addr;
- {
- struct section_offsets *section_offsets;
- int i;
-
- section_offsets = (struct section_offsets *)
- obstack_alloc (&objfile -> psymbol_obstack,
- sizeof (struct section_offsets) +
- sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
-
- for (i = 0; i < SECT_OFF_MAX; i++)
- ANOFFSET (section_offsets, i) = addr;
-
- return section_offsets;
- }
-
- /* 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 */
- dbx_symfile_offsets, /* sym_offsets: parse user's offsets to internal form */
- 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 */
- dbx_symfile_offsets, /* sym_offsets: parse user's offsets to internal form */
- 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 */
- dbx_symfile_offsets, /* sym_offsets: parse user's offsets to internal form */
- 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);
- }
-