1 /* Read dbx symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1986-2019 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* This module provides three functions: dbx_symfile_init,
20 which initializes to read a symbol file; dbx_new_init, which
21 discards existing cached information when all symbols are being
22 discarded; and dbx_symfile_read, which reads a symbol table
25 dbx_symfile_read only does the minimum work necessary for letting the
26 user "name" things symbolically; it does not read the entire symtab.
27 Instead, it reads the external and static symbols and puts them in partial
28 symbol tables. When more extensive information is requested of a
29 file, the corresponding partial symbol table is mutated into a full
30 fledged symbol table by going back and reading the symbols
31 for real. dbx_psymtab_to_symtab() is the function that does this */
34 #if defined(__CYGNUSCLIB__)
35 #include <sys/types.h>
39 #include "gdb_obstack.h"
42 #include "breakpoint.h"
44 #include "gdbcore.h" /* for bfd stuff */
45 #include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */
46 #include "filenames.h"
48 #include "buildsym-legacy.h"
49 #include "stabsread.h"
50 #include "gdb-stabs.h"
52 #include "complaints.h"
54 #include "cp-support.h"
57 #include "aout/aout64.h"
58 #include "aout/stab_gnu.h" /* We always use GNU stabs, not
62 /* Key for dbx-associated data. */
64 objfile_key<dbx_symfile_info> dbx_objfile_data_key;
66 /* We put a pointer to this structure in the read_symtab_private field
71 /* Offset within the file symbol table of first local symbol for this
76 /* Length (in bytes) of the section of the symbol table devoted to
77 this file's symbols (actually, the section bracketed may contain
78 more than just this file's symbols). If ldsymlen is 0, the only
79 reason for this thing's existence is the dependency list. Nothing
80 else will happen when it is read in. */
84 /* The size of each symbol in the symbol file (in external form). */
88 /* Further information needed to locate the symbols if they are in
93 int file_string_offset;
94 enum language pst_language;
97 #define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff)
98 #define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen)
99 #define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private))
100 #define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size)
101 #define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset)
102 #define STRING_OFFSET(p) (SYMLOC(p)->string_offset)
103 #define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset)
104 #define PST_LANGUAGE(p) (SYMLOC(p)->pst_language)
107 /* The objfile we are currently reading. */
109 static struct objfile *dbxread_objfile;
111 /* Remember what we deduced to be the source language of this psymtab. */
113 static enum language psymtab_language = language_unknown;
115 /* The BFD for this file -- implicit parameter to next_symbol_text. */
117 static bfd *symfile_bfd;
119 /* The size of each symbol in the symbol file (in external form).
120 This is set by dbx_symfile_read when building psymtabs, and by
121 dbx_psymtab_to_symtab when building symtabs. */
123 static unsigned symbol_size;
125 /* This is the offset of the symbol table in the executable file. */
127 static unsigned symbol_table_offset;
129 /* This is the offset of the string table in the executable file. */
131 static unsigned string_table_offset;
133 /* For elf+stab executables, the n_strx field is not a simple index
134 into the string table. Instead, each .o file has a base offset in
135 the string table, and the associated symbols contain offsets from
136 this base. The following two variables contain the base offset for
137 the current and next .o files. */
139 static unsigned int file_string_table_offset;
140 static unsigned int next_file_string_table_offset;
142 /* .o and NLM files contain unrelocated addresses which are based at
143 0. When non-zero, this flag disables some of the special cases for
144 Solaris elf+stab text addresses at location 0. */
146 static int symfile_relocatable = 0;
148 /* When set, we are processing a .o file compiled by sun acc. This is
149 misnamed; it refers to all stabs-in-elf implementations which use
150 N_UNDF the way Sun does, including Solaris gcc. Hopefully all
151 stabs-in-elf implementations ever invented will choose to be
154 static unsigned char processing_acc_compilation;
157 /* The lowest text address we have yet encountered. This is needed
158 because in an a.out file, there is no header field which tells us
159 what address the program is actually going to be loaded at, so we
160 need to make guesses based on the symbols (which *are* relocated to
161 reflect the address it will be loaded at). */
163 static CORE_ADDR lowest_text_address;
165 /* Non-zero if there is any line number info in the objfile. Prevents
166 dbx_end_psymtab from discarding an otherwise empty psymtab. */
168 static int has_line_numbers;
170 /* Complaints about the symbols we have encountered. */
173 unknown_symtype_complaint (const char *arg1)
175 complaint (_("unknown symbol type %s"), arg1);
179 lbrac_mismatch_complaint (int arg1)
181 complaint (_("N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d"), arg1);
185 repeated_header_complaint (const char *arg1, int arg2)
187 complaint (_("\"repeated\" header file %s not "
188 "previously seen, at symtab pos %d"),
192 /* find_text_range --- find start and end of loadable code sections
194 The find_text_range function finds the shortest address range that
195 encloses all sections containing executable code, and stores it in
196 objfile's text_addr and text_size members.
198 dbx_symfile_read will use this to finish off the partial symbol
199 table, in some cases. */
202 find_text_range (bfd * sym_bfd, struct objfile *objfile)
209 for (sec = sym_bfd->sections; sec; sec = sec->next)
210 if (bfd_get_section_flags (sym_bfd, sec) & SEC_CODE)
212 CORE_ADDR sec_start = bfd_section_vma (sym_bfd, sec);
213 CORE_ADDR sec_end = sec_start + bfd_section_size (sym_bfd, sec);
217 if (sec_start < start)
232 error (_("Can't find any code sections in symbol file"));
234 DBX_TEXT_ADDR (objfile) = start;
235 DBX_TEXT_SIZE (objfile) = end - start;
240 /* During initial symbol readin, we need to have a structure to keep
241 track of which psymtabs have which bincls in them. This structure
242 is used during readin to setup the list of dependencies within each
243 partial symbol table. */
245 struct header_file_location
247 header_file_location (const char *name_, int instance_,
248 struct partial_symtab *pst_)
250 instance (instance_),
255 const char *name; /* Name of header file */
256 int instance; /* See above */
257 struct partial_symtab *pst; /* Partial symtab that has the
258 BINCL/EINCL defs for this file. */
261 /* The list of bincls. */
262 static std::vector<struct header_file_location> *bincl_list;
264 /* Local function prototypes. */
266 static void read_ofile_symtab (struct objfile *, struct partial_symtab *);
268 static void dbx_read_symtab (struct partial_symtab *self,
269 struct objfile *objfile);
271 static void dbx_psymtab_to_symtab_1 (struct objfile *, struct partial_symtab *);
273 static void read_dbx_symtab (minimal_symbol_reader &, struct objfile *);
275 static struct partial_symtab *find_corresponding_bincl_psymtab (const char *,
278 static const char *dbx_next_symbol_text (struct objfile *);
280 static void fill_symbuf (bfd *);
282 static void dbx_symfile_init (struct objfile *);
284 static void dbx_new_init (struct objfile *);
286 static void dbx_symfile_read (struct objfile *, symfile_add_flags);
288 static void dbx_symfile_finish (struct objfile *);
290 static void record_minimal_symbol (minimal_symbol_reader &,
291 const char *, CORE_ADDR, int,
294 static void add_new_header_file (const char *, int);
296 static void add_old_header_file (const char *, int);
298 static void add_this_object_header_file (int);
300 static struct partial_symtab *start_psymtab (struct objfile *, const char *,
303 /* Free up old header file tables. */
306 free_header_files (void)
308 if (this_object_header_files)
310 xfree (this_object_header_files);
311 this_object_header_files = NULL;
313 n_allocated_this_object_header_files = 0;
316 /* Allocate new header file tables. */
319 init_header_files (void)
321 n_allocated_this_object_header_files = 10;
322 this_object_header_files = XNEWVEC (int, 10);
325 /* Add header file number I for this object file
326 at the next successive FILENUM. */
329 add_this_object_header_file (int i)
331 if (n_this_object_header_files == n_allocated_this_object_header_files)
333 n_allocated_this_object_header_files *= 2;
334 this_object_header_files
335 = (int *) xrealloc ((char *) this_object_header_files,
336 n_allocated_this_object_header_files * sizeof (int));
339 this_object_header_files[n_this_object_header_files++] = i;
342 /* Add to this file an "old" header file, one already seen in
343 a previous object file. NAME is the header file's name.
344 INSTANCE is its instance code, to select among multiple
345 symbol tables for the same header file. */
348 add_old_header_file (const char *name, int instance)
350 struct header_file *p = HEADER_FILES (dbxread_objfile);
353 for (i = 0; i < N_HEADER_FILES (dbxread_objfile); i++)
354 if (filename_cmp (p[i].name, name) == 0 && instance == p[i].instance)
356 add_this_object_header_file (i);
359 repeated_header_complaint (name, symnum);
362 /* Add to this file a "new" header file: definitions for its types follow.
363 NAME is the header file's name.
364 Most often this happens only once for each distinct header file,
365 but not necessarily. If it happens more than once, INSTANCE has
366 a different value each time, and references to the header file
367 use INSTANCE values to select among them.
369 dbx output contains "begin" and "end" markers for each new header file,
370 but at this level we just need to know which files there have been;
371 so we record the file when its "begin" is seen and ignore the "end". */
374 add_new_header_file (const char *name, int instance)
377 struct header_file *hfile;
379 /* Make sure there is room for one more header file. */
381 i = N_ALLOCATED_HEADER_FILES (dbxread_objfile);
383 if (N_HEADER_FILES (dbxread_objfile) == i)
387 N_ALLOCATED_HEADER_FILES (dbxread_objfile) = 10;
388 HEADER_FILES (dbxread_objfile) = (struct header_file *)
389 xmalloc (10 * sizeof (struct header_file));
394 N_ALLOCATED_HEADER_FILES (dbxread_objfile) = i;
395 HEADER_FILES (dbxread_objfile) = (struct header_file *)
396 xrealloc ((char *) HEADER_FILES (dbxread_objfile),
397 (i * sizeof (struct header_file)));
401 /* Create an entry for this header file. */
403 i = N_HEADER_FILES (dbxread_objfile)++;
404 hfile = HEADER_FILES (dbxread_objfile) + i;
405 hfile->name = xstrdup (name);
406 hfile->instance = instance;
408 hfile->vector = XCNEWVEC (struct type *, 10);
410 add_this_object_header_file (i);
414 static struct type **
415 explicit_lookup_type (int real_filenum, int index)
417 struct header_file *f = &HEADER_FILES (dbxread_objfile)[real_filenum];
419 if (index >= f->length)
422 f->vector = (struct type **)
423 xrealloc (f->vector, f->length * sizeof (struct type *));
424 memset (&f->vector[f->length / 2],
425 '\0', f->length * sizeof (struct type *) / 2);
427 return &f->vector[index];
432 record_minimal_symbol (minimal_symbol_reader &reader,
433 const char *name, CORE_ADDR address, int type,
434 struct objfile *objfile)
436 enum minimal_symbol_type ms_type;
443 section = SECT_OFF_TEXT (objfile);
447 section = SECT_OFF_DATA (objfile);
451 section = SECT_OFF_BSS (objfile);
460 section = SECT_OFF_DATA (objfile);
463 /* I don't think this type actually exists; since a N_SETV is the result
464 of going over many .o files, it doesn't make sense to have one
466 ms_type = mst_file_data;
467 section = SECT_OFF_DATA (objfile);
474 ms_type = mst_file_text;
475 section = SECT_OFF_TEXT (objfile);
478 ms_type = mst_file_data;
480 /* Check for __DYNAMIC, which is used by Sun shared libraries.
481 Record it as global even if it's local, not global, so
482 lookup_minimal_symbol can find it. We don't check symbol_leading_char
483 because for SunOS4 it always is '_'. */
484 if (name[8] == 'C' && strcmp ("__DYNAMIC", name) == 0)
487 /* Same with virtual function tables, both global and static. */
489 const char *tempstring = name;
491 if (tempstring[0] == bfd_get_symbol_leading_char (objfile->obfd))
493 if (is_vtable_name (tempstring))
496 section = SECT_OFF_DATA (objfile);
499 ms_type = mst_file_bss;
500 section = SECT_OFF_BSS (objfile);
503 ms_type = mst_unknown;
508 if ((ms_type == mst_file_text || ms_type == mst_text)
509 && address < lowest_text_address)
510 lowest_text_address = address;
512 reader.record_with_info (name, address, ms_type, section);
515 /* Scan and build partial symbols for a symbol file.
516 We have been initialized by a call to dbx_symfile_init, which
517 put all the relevant info into a "struct dbx_symfile_info",
518 hung off the objfile structure. */
521 dbx_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
526 sym_bfd = objfile->obfd;
528 /* .o and .nlm files are relocatables with text, data and bss segs based at
529 0. This flag disables special (Solaris stabs-in-elf only) fixups for
530 symbols with a value of 0. */
532 symfile_relocatable = bfd_get_file_flags (sym_bfd) & HAS_RELOC;
534 val = bfd_seek (sym_bfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET);
536 perror_with_name (objfile_name (objfile));
538 /* Size the symbol table. */
539 init_psymbol_list (objfile, DBX_SYMCOUNT (objfile));
541 symbol_size = DBX_SYMBOL_SIZE (objfile);
542 symbol_table_offset = DBX_SYMTAB_OFFSET (objfile);
544 scoped_free_pendings free_pending;
546 minimal_symbol_reader reader (objfile);
548 /* Read stabs data from executable file and define symbols. */
550 read_dbx_symtab (reader, objfile);
552 /* Install any minimal symbols that have been collected as the current
553 minimal symbols for this objfile. */
558 /* Initialize anything that needs initializing when a completely new
559 symbol file is specified (not just adding some symbols from another
560 file, e.g. a shared library). */
563 dbx_new_init (struct objfile *ignore)
565 stabsread_new_init ();
566 init_header_files ();
570 /* dbx_symfile_init ()
571 is the dbx-specific initialization routine for reading symbols.
572 It is passed a struct objfile which contains, among other things,
573 the BFD for the file whose symbols are being read, and a slot for a pointer
574 to "private data" which we fill with goodies.
576 We read the string table into malloc'd space and stash a pointer to it.
578 Since BFD doesn't know how to read debug symbols in a format-independent
579 way (and may never do so...), we have to do it ourselves. We will never
580 be called unless this is an a.out (or very similar) file.
581 FIXME, there should be a cleaner peephole into the BFD environment here. */
583 #define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */
586 dbx_symfile_init (struct objfile *objfile)
589 bfd *sym_bfd = objfile->obfd;
590 char *name = bfd_get_filename (sym_bfd);
592 unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE];
594 /* Allocate struct to keep track of the symfile. */
595 dbx_objfile_data_key.emplace (objfile);
597 DBX_TEXT_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
598 DBX_DATA_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".data");
599 DBX_BSS_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".bss");
601 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */
602 #define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd))
603 #define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd))
605 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */
607 text_sect = bfd_get_section_by_name (sym_bfd, ".text");
609 error (_("Can't find .text section in symbol file"));
610 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect);
611 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect);
613 DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd);
614 DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd);
615 DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
617 /* Read the string table and stash it away in the objfile_obstack.
618 When we blow away the objfile the string table goes away as well.
619 Note that gdb used to use the results of attempting to malloc the
620 string table, based on the size it read, as a form of sanity check
621 for botched byte swapping, on the theory that a byte swapped string
622 table size would be so totally bogus that the malloc would fail. Now
623 that we put in on the objfile_obstack, we can't do this since gdb gets
624 a fatal error (out of virtual memory) if the size is bogus. We can
625 however at least check to see if the size is less than the size of
626 the size field itself, or larger than the size of the entire file.
627 Note that all valid string tables have a size greater than zero, since
628 the bytes used to hold the size are included in the count. */
630 if (STRING_TABLE_OFFSET == 0)
632 /* It appears that with the existing bfd code, STRING_TABLE_OFFSET
633 will never be zero, even when there is no string table. This
634 would appear to be a bug in bfd. */
635 DBX_STRINGTAB_SIZE (objfile) = 0;
636 DBX_STRINGTAB (objfile) = NULL;
640 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
642 perror_with_name (name);
644 memset (size_temp, 0, sizeof (size_temp));
645 val = bfd_bread (size_temp, sizeof (size_temp), sym_bfd);
648 perror_with_name (name);
652 /* With the existing bfd code, STRING_TABLE_OFFSET will be set to
653 EOF if there is no string table, and attempting to read the size
654 from EOF will read zero bytes. */
655 DBX_STRINGTAB_SIZE (objfile) = 0;
656 DBX_STRINGTAB (objfile) = NULL;
660 /* Read some data that would appear to be the string table size.
661 If there really is a string table, then it is probably the right
662 size. Byteswap if necessary and validate the size. Note that
663 the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some
664 random data that happened to be at STRING_TABLE_OFFSET, because
665 bfd can't tell us there is no string table, the sanity checks may
666 or may not catch this. */
667 DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp);
669 if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp)
670 || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
671 error (_("ridiculous string table size (%d bytes)."),
672 DBX_STRINGTAB_SIZE (objfile));
674 DBX_STRINGTAB (objfile) =
675 (char *) obstack_alloc (&objfile->objfile_obstack,
676 DBX_STRINGTAB_SIZE (objfile));
677 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile));
679 /* Now read in the string table in one big gulp. */
681 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
683 perror_with_name (name);
684 val = bfd_bread (DBX_STRINGTAB (objfile),
685 DBX_STRINGTAB_SIZE (objfile),
687 if (val != DBX_STRINGTAB_SIZE (objfile))
688 perror_with_name (name);
693 /* Perform any local cleanups required when we are done with a particular
694 objfile. I.E, we are in the process of discarding all symbol information
695 for an objfile, freeing up all memory held for it, and unlinking the
696 objfile struct from the global list of known objfiles. */
699 dbx_symfile_finish (struct objfile *objfile)
701 free_header_files ();
704 dbx_symfile_info::~dbx_symfile_info ()
706 if (header_files != NULL)
708 int i = n_header_files;
709 struct header_file *hfiles = header_files;
713 xfree (hfiles[i].name);
714 xfree (hfiles[i].vector);
722 /* Buffer for reading the symbol table entries. */
723 static struct external_nlist symbuf[4096];
724 static int symbuf_idx;
725 static int symbuf_end;
727 /* Name of last function encountered. Used in Solaris to approximate
728 object file boundaries. */
729 static const char *last_function_name;
731 /* The address in memory of the string table of the object file we are
732 reading (which might not be the "main" object file, but might be a
733 shared library or some other dynamically loaded thing). This is
734 set by read_dbx_symtab when building psymtabs, and by
735 read_ofile_symtab when building symtabs, and is used only by
736 next_symbol_text. FIXME: If that is true, we don't need it when
737 building psymtabs, right? */
738 static char *stringtab_global;
740 /* These variables are used to control fill_symbuf when the stabs
741 symbols are not contiguous (as may be the case when a COFF file is
742 linked using --split-by-reloc). */
743 static const std::vector<asection *> *symbuf_sections;
744 static size_t sect_idx;
745 static unsigned int symbuf_left;
746 static unsigned int symbuf_read;
748 /* This variable stores a global stabs buffer, if we read stabs into
749 memory in one chunk in order to process relocations. */
750 static bfd_byte *stabs_data;
752 /* Refill the symbol table input buffer
753 and set the variables that control fetching entries from it.
754 Reports an error if no data available.
755 This function can read past the end of the symbol table
756 (into the string table) but this does no harm. */
759 fill_symbuf (bfd *sym_bfd)
766 nbytes = sizeof (symbuf);
767 if (nbytes > symbuf_left)
768 nbytes = symbuf_left;
769 memcpy (symbuf, stabs_data + symbuf_read, nbytes);
771 else if (symbuf_sections == NULL)
773 count = sizeof (symbuf);
774 nbytes = bfd_bread (symbuf, count, sym_bfd);
778 if (symbuf_left <= 0)
780 file_ptr filepos = (*symbuf_sections)[sect_idx]->filepos;
782 if (bfd_seek (sym_bfd, filepos, SEEK_SET) != 0)
783 perror_with_name (bfd_get_filename (sym_bfd));
784 symbuf_left = bfd_section_size (sym_bfd, (*symbuf_sections)[sect_idx]);
785 symbol_table_offset = filepos - symbuf_read;
790 if (count > sizeof (symbuf))
791 count = sizeof (symbuf);
792 nbytes = bfd_bread (symbuf, count, sym_bfd);
796 perror_with_name (bfd_get_filename (sym_bfd));
797 else if (nbytes == 0)
798 error (_("Premature end of file reading symbol table"));
799 symbuf_end = nbytes / symbol_size;
801 symbuf_left -= nbytes;
802 symbuf_read += nbytes;
806 stabs_seek (int sym_offset)
810 symbuf_read += sym_offset;
811 symbuf_left -= sym_offset;
814 bfd_seek (symfile_bfd, sym_offset, SEEK_CUR);
817 #define INTERNALIZE_SYMBOL(intern, extern, abfd) \
819 (intern).n_strx = bfd_h_get_32 (abfd, (extern)->e_strx); \
820 (intern).n_type = bfd_h_get_8 (abfd, (extern)->e_type); \
821 (intern).n_other = 0; \
822 (intern).n_desc = bfd_h_get_16 (abfd, (extern)->e_desc); \
823 if (bfd_get_sign_extend_vma (abfd)) \
824 (intern).n_value = bfd_h_get_signed_32 (abfd, (extern)->e_value); \
826 (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \
829 /* Invariant: The symbol pointed to by symbuf_idx is the first one
830 that hasn't been swapped. Swap the symbol at the same time
831 that symbuf_idx is incremented. */
833 /* dbx allows the text of a symbol name to be continued into the
834 next symbol name! When such a continuation is encountered
835 (a \ at the end of the text of a name)
836 call this function to get the continuation. */
839 dbx_next_symbol_text (struct objfile *objfile)
841 struct internal_nlist nlist;
843 if (symbuf_idx == symbuf_end)
844 fill_symbuf (symfile_bfd);
847 INTERNALIZE_SYMBOL (nlist, &symbuf[symbuf_idx], symfile_bfd);
848 OBJSTAT (objfile, n_stabs++);
852 return nlist.n_strx + stringtab_global + file_string_table_offset;
856 /* Given a name, value pair, find the corresponding
857 bincl in the list. Return the partial symtab associated
858 with that header_file_location. */
860 static struct partial_symtab *
861 find_corresponding_bincl_psymtab (const char *name, int instance)
863 for (const header_file_location &bincl : *bincl_list)
864 if (bincl.instance == instance
865 && strcmp (name, bincl.name) == 0)
868 repeated_header_complaint (name, symnum);
869 return (struct partial_symtab *) 0;
872 /* Set namestring based on nlist. If the string table index is invalid,
873 give a fake name, and print a single error message per symbol file read,
874 rather than abort the symbol reading or flood the user with messages. */
877 set_namestring (struct objfile *objfile, const struct internal_nlist *nlist)
879 const char *namestring;
881 if (nlist->n_strx + file_string_table_offset
882 >= DBX_STRINGTAB_SIZE (objfile)
883 || nlist->n_strx + file_string_table_offset < nlist->n_strx)
885 complaint (_("bad string table offset in symbol %d"),
887 namestring = "<bad string table offset>";
890 namestring = (nlist->n_strx + file_string_table_offset
891 + DBX_STRINGTAB (objfile));
895 static struct bound_minimal_symbol
896 find_stab_function (const char *namestring, const char *filename,
897 struct objfile *objfile)
899 struct bound_minimal_symbol msym;
902 const char *colon = strchr (namestring, ':');
906 n = colon - namestring;
908 char *p = (char *) alloca (n + 2);
909 strncpy (p, namestring, n);
912 msym = lookup_minimal_symbol (p, filename, objfile);
913 if (msym.minsym == NULL)
915 /* Sun Fortran appends an underscore to the minimal symbol name,
916 try again with an appended underscore if the minimal symbol
920 msym = lookup_minimal_symbol (p, filename, objfile);
923 if (msym.minsym == NULL && filename != NULL)
925 /* Try again without the filename. */
927 msym = lookup_minimal_symbol (p, NULL, objfile);
929 if (msym.minsym == NULL && filename != NULL)
931 /* And try again for Sun Fortran, but without the filename. */
934 msym = lookup_minimal_symbol (p, NULL, objfile);
941 function_outside_compilation_unit_complaint (const char *arg1)
943 complaint (_("function `%s' appears to be defined "
944 "outside of all compilation units"),
948 /* Setup partial_symtab's describing each source file for which
949 debugging information is available. */
952 read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
954 struct gdbarch *gdbarch = get_objfile_arch (objfile);
955 struct external_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch. */
956 struct internal_nlist nlist;
959 const char *sym_name;
962 const char *namestring;
964 int past_first_source_file = 0;
965 CORE_ADDR last_function_start = 0;
970 /* Current partial symtab. */
971 struct partial_symtab *pst;
973 /* List of current psymtab's include files. */
974 const char **psymtab_include_list;
975 int includes_allocated;
978 /* Index within current psymtab dependency list. */
979 struct partial_symtab **dependency_list;
980 int dependencies_used, dependencies_allocated;
982 text_addr = DBX_TEXT_ADDR (objfile);
983 text_size = DBX_TEXT_SIZE (objfile);
985 /* FIXME. We probably want to change stringtab_global rather than add this
986 while processing every symbol entry. FIXME. */
987 file_string_table_offset = 0;
988 next_file_string_table_offset = 0;
990 stringtab_global = DBX_STRINGTAB (objfile);
992 pst = (struct partial_symtab *) 0;
994 includes_allocated = 30;
996 psymtab_include_list = (const char **) alloca (includes_allocated *
997 sizeof (const char *));
999 dependencies_allocated = 30;
1000 dependencies_used = 0;
1002 (struct partial_symtab **) alloca (dependencies_allocated *
1003 sizeof (struct partial_symtab *));
1005 /* Init bincl list */
1006 std::vector<struct header_file_location> bincl_storage;
1007 scoped_restore restore_bincl_global
1008 = make_scoped_restore (&bincl_list, &bincl_storage);
1010 set_last_source_file (NULL);
1012 lowest_text_address = (CORE_ADDR) -1;
1014 symfile_bfd = objfile->obfd; /* For next_text_symbol. */
1015 abfd = objfile->obfd;
1016 symbuf_end = symbuf_idx = 0;
1017 next_symbol_text_func = dbx_next_symbol_text;
1018 textlow_not_set = 1;
1019 has_line_numbers = 0;
1021 /* FIXME: jimb/2003-09-12: We don't apply the right section's offset
1022 to global and static variables. The stab for a global or static
1023 variable doesn't give us any indication of which section it's in,
1024 so we can't tell immediately which offset in
1025 objfile->section_offsets we should apply to the variable's
1028 We could certainly find out which section contains the variable
1029 by looking up the variable's unrelocated address with
1030 find_pc_section, but that would be expensive; this is the
1031 function that constructs the partial symbol tables by examining
1032 every symbol in the entire executable, and it's
1033 performance-critical. So that expense would not be welcome. I'm
1034 not sure what to do about this at the moment.
1036 What we have done for years is to simply assume that the .data
1037 section's offset is appropriate for all global and static
1038 variables. Recently, this was expanded to fall back to the .bss
1039 section's offset if there is no .data section, and then to the
1040 .rodata section's offset. */
1041 data_sect_index = objfile->sect_index_data;
1042 if (data_sect_index == -1)
1043 data_sect_index = SECT_OFF_BSS (objfile);
1044 if (data_sect_index == -1)
1045 data_sect_index = SECT_OFF_RODATA (objfile);
1047 /* If data_sect_index is still -1, that's okay. It's perfectly fine
1048 for the file to have no .data, no .bss, and no .text at all, if
1049 it also has no global or static variables. If it does, we will
1050 get an internal error from an ANOFFSET macro below when we try to
1051 use data_sect_index. */
1053 for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++)
1055 /* Get the symbol for this run and pull out some info. */
1056 QUIT; /* Allow this to be interruptable. */
1057 if (symbuf_idx == symbuf_end)
1059 bufp = &symbuf[symbuf_idx++];
1062 * Special case to speed up readin.
1064 if (bfd_h_get_8 (abfd, bufp->e_type) == N_SLINE)
1066 has_line_numbers = 1;
1070 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
1071 OBJSTAT (objfile, n_stabs++);
1073 /* Ok. There is a lot of code duplicated in the rest of this
1074 switch statement (for efficiency reasons). Since I don't
1075 like duplicating code, I will do my penance here, and
1076 describe the code which is duplicated:
1078 *) The assignment to namestring.
1079 *) The call to strchr.
1080 *) The addition of a partial symbol the two partial
1081 symbol lists. This last is a large section of code, so
1082 I've imbedded it in the following macro. */
1084 switch (nlist.n_type)
1087 * Standard, external, non-debugger, symbols
1090 case N_TEXT | N_EXT:
1091 case N_NBTEXT | N_EXT:
1094 case N_DATA | N_EXT:
1095 case N_NBDATA | N_EXT:
1100 case N_NBBSS | N_EXT:
1101 case N_SETV | N_EXT: /* FIXME, is this in BSS? */
1106 namestring = set_namestring (objfile, &nlist);
1108 record_minimal_symbol (reader, namestring, nlist.n_value,
1109 nlist.n_type, objfile); /* Always */
1112 /* Standard, local, non-debugger, symbols. */
1116 /* We need to be able to deal with both N_FN or N_TEXT,
1117 because we have no way of knowing whether the sys-supplied ld
1118 or GNU ld was used to make the executable. Sequents throw
1119 in another wrinkle -- they renumbered N_FN. */
1124 namestring = set_namestring (objfile, &nlist);
1126 if ((namestring[0] == '-' && namestring[1] == 'l')
1127 || (namestring[(nsl = strlen (namestring)) - 1] == 'o'
1128 && namestring[nsl - 2] == '.'))
1130 if (past_first_source_file && pst
1131 /* The gould NP1 uses low values for .o and -l symbols
1132 which are not the address. */
1133 && nlist.n_value >= pst->raw_text_low ())
1135 dbx_end_psymtab (objfile, pst, psymtab_include_list,
1136 includes_used, symnum * symbol_size,
1137 nlist.n_value > pst->raw_text_high ()
1138 ? nlist.n_value : pst->raw_text_high (),
1139 dependency_list, dependencies_used,
1141 pst = (struct partial_symtab *) 0;
1143 dependencies_used = 0;
1144 has_line_numbers = 0;
1147 past_first_source_file = 1;
1156 case N_UNDF | N_EXT:
1157 /* The case (nlist.n_value != 0) is a "Fortran COMMON" symbol.
1158 We used to rely on the target to tell us whether it knows
1159 where the symbol has been relocated to, but none of the
1160 target implementations actually provided that operation.
1161 So we just ignore the symbol, the same way we would do if
1162 we had a target-side symbol lookup which returned no match.
1164 All other symbols (with nlist.n_value == 0), are really
1165 undefined, and so we ignore them too. */
1169 if (processing_acc_compilation && nlist.n_strx == 1)
1171 /* Deal with relative offsets in the string table
1172 used in ELF+STAB under Solaris. If we want to use the
1173 n_strx field, which contains the name of the file,
1174 we must adjust file_string_table_offset *before* calling
1175 set_namestring(). */
1176 past_first_source_file = 1;
1177 file_string_table_offset = next_file_string_table_offset;
1178 next_file_string_table_offset =
1179 file_string_table_offset + nlist.n_value;
1180 if (next_file_string_table_offset < file_string_table_offset)
1181 error (_("string table offset backs up at %d"), symnum);
1182 /* FIXME -- replace error() with complaint. */
1187 /* Lots of symbol types we can just ignore. */
1194 /* Keep going . . . */
1197 * Special symbol types for GNU
1200 case N_INDR | N_EXT:
1202 case N_SETA | N_EXT:
1204 case N_SETT | N_EXT:
1206 case N_SETD | N_EXT:
1208 case N_SETB | N_EXT:
1219 static int prev_so_symnum = -10;
1220 static int first_so_symnum;
1222 static const char *dirname_nso;
1223 int prev_textlow_not_set;
1225 valu = nlist.n_value;
1227 prev_textlow_not_set = textlow_not_set;
1229 /* A zero value is probably an indication for the SunPRO 3.0
1230 compiler. dbx_end_psymtab explicitly tests for zero, so
1231 don't relocate it. */
1233 if (nlist.n_value == 0
1234 && gdbarch_sofun_address_maybe_missing (gdbarch))
1236 textlow_not_set = 1;
1240 textlow_not_set = 0;
1242 past_first_source_file = 1;
1244 if (prev_so_symnum != symnum - 1)
1245 { /* Here if prev stab wasn't N_SO. */
1246 first_so_symnum = symnum;
1250 dbx_end_psymtab (objfile, pst, psymtab_include_list,
1251 includes_used, symnum * symbol_size,
1252 (valu > pst->raw_text_high ()
1253 ? valu : pst->raw_text_high ()),
1254 dependency_list, dependencies_used,
1255 prev_textlow_not_set);
1256 pst = (struct partial_symtab *) 0;
1258 dependencies_used = 0;
1259 has_line_numbers = 0;
1263 prev_so_symnum = symnum;
1265 /* End the current partial symtab and start a new one. */
1267 namestring = set_namestring (objfile, &nlist);
1269 /* Null name means end of .o file. Don't start a new one. */
1270 if (*namestring == '\000')
1273 /* Some compilers (including gcc) emit a pair of initial N_SOs.
1274 The first one is a directory name; the second the file name.
1275 If pst exists, is empty, and has a filename ending in '/',
1276 we assume the previous N_SO was a directory name. */
1278 p = lbasename (namestring);
1279 if (p != namestring && *p == '\000')
1281 /* Save the directory name SOs locally, then save it into
1282 the psymtab when it's created below. */
1283 dirname_nso = namestring;
1287 /* Some other compilers (C++ ones in particular) emit useless
1288 SOs for non-existant .c files. We ignore all subsequent SOs
1289 that immediately follow the first. */
1293 pst = start_psymtab (objfile,
1295 first_so_symnum * symbol_size);
1296 pst->dirname = dirname_nso;
1304 enum language tmp_language;
1306 /* Add this bincl to the bincl_list for future EXCLs. No
1307 need to save the string; it'll be around until
1308 read_dbx_symtab function returns. */
1310 namestring = set_namestring (objfile, &nlist);
1311 tmp_language = deduce_language_from_filename (namestring);
1313 /* Only change the psymtab's language if we've learned
1314 something useful (eg. tmp_language is not language_unknown).
1315 In addition, to match what start_subfile does, never change
1317 if (tmp_language != language_unknown
1318 && (tmp_language != language_c
1319 || psymtab_language != language_cplus))
1320 psymtab_language = tmp_language;
1324 /* FIXME: we should not get here without a PST to work on.
1325 Attempt to recover. */
1326 complaint (_("N_BINCL %s not in entries for "
1327 "any file, at symtab pos %d"),
1328 namestring, symnum);
1331 bincl_list->emplace_back (namestring, nlist.n_value, pst);
1333 /* Mark down an include file in the current psymtab. */
1335 goto record_include_file;
1340 enum language tmp_language;
1342 /* Mark down an include file in the current psymtab. */
1343 namestring = set_namestring (objfile, &nlist);
1344 tmp_language = deduce_language_from_filename (namestring);
1346 /* Only change the psymtab's language if we've learned
1347 something useful (eg. tmp_language is not language_unknown).
1348 In addition, to match what start_subfile does, never change
1350 if (tmp_language != language_unknown
1351 && (tmp_language != language_c
1352 || psymtab_language != language_cplus))
1353 psymtab_language = tmp_language;
1355 /* In C++, one may expect the same filename to come round many
1356 times, when code is coming alternately from the main file
1357 and from inline functions in other files. So I check to see
1358 if this is a file we've seen before -- either the main
1359 source file, or a previously included file.
1361 This seems to be a lot of time to be spending on N_SOL, but
1362 things like "break c-exp.y:435" need to work (I
1363 suppose the psymtab_include_list could be hashed or put
1364 in a binary tree, if profiling shows this is a major hog). */
1365 if (pst && filename_cmp (namestring, pst->filename) == 0)
1370 for (i = 0; i < includes_used; i++)
1371 if (filename_cmp (namestring, psymtab_include_list[i]) == 0)
1380 record_include_file:
1382 psymtab_include_list[includes_used++] = namestring;
1383 if (includes_used >= includes_allocated)
1385 const char **orig = psymtab_include_list;
1387 psymtab_include_list = (const char **)
1388 alloca ((includes_allocated *= 2) * sizeof (const char *));
1389 memcpy (psymtab_include_list, orig,
1390 includes_used * sizeof (const char *));
1394 case N_LSYM: /* Typedef or automatic variable. */
1395 case N_STSYM: /* Data seg var -- static. */
1396 case N_LCSYM: /* BSS " */
1397 case N_ROSYM: /* Read-only data seg var -- static. */
1398 case N_NBSTS: /* Gould nobase. */
1399 case N_NBLCS: /* symbols. */
1401 case N_GSYM: /* Global (extern) variable; can be
1402 data or bss (sigh FIXME). */
1404 /* Following may probably be ignored; I'll leave them here
1405 for now (until I do Pascal and Modula 2 extensions). */
1407 case N_PC: /* I may or may not need this; I
1409 case N_M2C: /* I suspect that I can ignore this here. */
1410 case N_SCOPE: /* Same. */
1414 namestring = set_namestring (objfile, &nlist);
1416 /* See if this is an end of function stab. */
1417 if (pst && nlist.n_type == N_FUN && *namestring == '\000')
1421 /* It's value is the size (in bytes) of the function for
1422 function relative stabs, or the address of the function's
1423 end for old style stabs. */
1424 valu = nlist.n_value + last_function_start;
1425 if (pst->raw_text_high () == 0 || valu > pst->raw_text_high ())
1426 pst->set_text_high (valu);
1430 p = (char *) strchr (namestring, ':');
1432 continue; /* Not a debugging symbol. */
1435 sym_name = NULL; /* pacify "gcc -Werror" */
1436 if (psymtab_language == language_cplus)
1438 std::string name (namestring, p - namestring);
1439 std::string new_name = cp_canonicalize_string (name.c_str ());
1440 if (!new_name.empty ())
1442 sym_len = new_name.length ();
1443 sym_name = (char *) obstack_copy0 (&objfile->objfile_obstack,
1451 sym_name = namestring;
1452 sym_len = p - namestring;
1455 /* Main processing section for debugging symbols which
1456 the initial read through the symbol tables needs to worry
1457 about. If we reach this point, the symbol which we are
1458 considering is definitely one we are interested in.
1459 p must also contain the (valid) index into the namestring
1460 which indicates the debugging type symbol. */
1465 if (gdbarch_static_transform_name_p (gdbarch))
1466 gdbarch_static_transform_name (gdbarch, namestring);
1468 add_psymbol_to_list (sym_name, sym_len, 1,
1469 VAR_DOMAIN, LOC_STATIC,
1471 psymbol_placement::STATIC,
1472 nlist.n_value, psymtab_language, objfile);
1476 /* The addresses in these entries are reported to be
1477 wrong. See the code that reads 'G's for symtabs. */
1478 add_psymbol_to_list (sym_name, sym_len, 1,
1479 VAR_DOMAIN, LOC_STATIC,
1481 psymbol_placement::GLOBAL,
1482 nlist.n_value, psymtab_language, objfile);
1486 /* When a 'T' entry is defining an anonymous enum, it
1487 may have a name which is the empty string, or a
1488 single space. Since they're not really defining a
1489 symbol, those shouldn't go in the partial symbol
1490 table. We do pick up the elements of such enums at
1491 'check_enum:', below. */
1492 if (p >= namestring + 2
1493 || (p == namestring + 1
1494 && namestring[0] != ' '))
1496 add_psymbol_to_list (sym_name, sym_len, 1,
1497 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
1498 psymbol_placement::STATIC,
1499 0, psymtab_language, objfile);
1502 /* Also a typedef with the same name. */
1503 add_psymbol_to_list (sym_name, sym_len, 1,
1504 VAR_DOMAIN, LOC_TYPEDEF, -1,
1505 psymbol_placement::STATIC,
1506 0, psymtab_language, objfile);
1513 if (p != namestring) /* a name is there, not just :T... */
1515 add_psymbol_to_list (sym_name, sym_len, 1,
1516 VAR_DOMAIN, LOC_TYPEDEF, -1,
1517 psymbol_placement::STATIC,
1518 0, psymtab_language, objfile);
1521 /* If this is an enumerated type, we need to
1522 add all the enum constants to the partial symbol
1523 table. This does not cover enums without names, e.g.
1524 "enum {a, b} c;" in C, but fortunately those are
1525 rare. There is no way for GDB to find those from the
1526 enum type without spending too much time on it. Thus
1527 to solve this problem, the compiler needs to put out the
1528 enum in a nameless type. GCC2 does this. */
1530 /* We are looking for something of the form
1531 <name> ":" ("t" | "T") [<number> "="] "e"
1532 {<constant> ":" <value> ","} ";". */
1534 /* Skip over the colon and the 't' or 'T'. */
1536 /* This type may be given a number. Also, numbers can come
1537 in pairs like (0,26). Skip over it. */
1538 while ((*p >= '0' && *p <= '9')
1539 || *p == '(' || *p == ',' || *p == ')'
1545 /* The aix4 compiler emits extra crud before the members. */
1548 /* Skip over the type (?). */
1552 /* Skip over the colon. */
1556 /* We have found an enumerated type. */
1557 /* According to comments in read_enum_type
1558 a comma could end it instead of a semicolon.
1559 I don't know where that happens.
1561 while (*p && *p != ';' && *p != ',')
1565 /* Check for and handle cretinous dbx symbol name
1567 if (*p == '\\' || (*p == '?' && p[1] == '\0'))
1568 p = next_symbol_text (objfile);
1570 /* Point to the character after the name
1571 of the enum constant. */
1572 for (q = p; *q && *q != ':'; q++)
1574 /* Note that the value doesn't matter for
1575 enum constants in psymtabs, just in symtabs. */
1576 add_psymbol_to_list (p, q - p, 1,
1577 VAR_DOMAIN, LOC_CONST, -1,
1578 psymbol_placement::STATIC, 0,
1579 psymtab_language, objfile);
1580 /* Point past the name. */
1582 /* Skip over the value. */
1583 while (*p && *p != ',')
1585 /* Advance past the comma. */
1593 /* Constant, e.g. from "const" in Pascal. */
1594 add_psymbol_to_list (sym_name, sym_len, 1,
1595 VAR_DOMAIN, LOC_CONST, -1,
1596 psymbol_placement::STATIC, 0,
1597 psymtab_language, objfile);
1603 int name_len = p - namestring;
1604 char *name = (char *) xmalloc (name_len + 1);
1606 memcpy (name, namestring, name_len);
1607 name[name_len] = '\0';
1608 function_outside_compilation_unit_complaint (name);
1611 /* Kludges for ELF/STABS with Sun ACC. */
1612 last_function_name = namestring;
1613 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
1614 value for the bottom of the text seg in those cases. */
1615 if (nlist.n_value == 0
1616 && gdbarch_sofun_address_maybe_missing (gdbarch))
1618 struct bound_minimal_symbol minsym
1619 = find_stab_function (namestring,
1620 pst ? pst->filename : NULL,
1622 if (minsym.minsym != NULL)
1623 nlist.n_value = MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym);
1625 if (pst && textlow_not_set
1626 && gdbarch_sofun_address_maybe_missing (gdbarch))
1628 pst->set_text_low (nlist.n_value);
1629 textlow_not_set = 0;
1633 /* Keep track of the start of the last function so we
1634 can handle end of function symbols. */
1635 last_function_start = nlist.n_value;
1637 /* In reordered executables this function may lie outside
1638 the bounds created by N_SO symbols. If that's the case
1639 use the address of this function as the low bound for
1640 the partial symbol table. */
1643 || (nlist.n_value < pst->raw_text_low ()
1644 && (nlist.n_value != 0))))
1646 pst->set_text_low (nlist.n_value);
1647 textlow_not_set = 0;
1649 add_psymbol_to_list (sym_name, sym_len, 1,
1650 VAR_DOMAIN, LOC_BLOCK,
1651 SECT_OFF_TEXT (objfile),
1652 psymbol_placement::STATIC,
1653 nlist.n_value, psymtab_language, objfile);
1656 /* Global functions were ignored here, but now they
1657 are put into the global psymtab like one would expect.
1658 They're also in the minimal symbol table. */
1662 int name_len = p - namestring;
1663 char *name = (char *) xmalloc (name_len + 1);
1665 memcpy (name, namestring, name_len);
1666 name[name_len] = '\0';
1667 function_outside_compilation_unit_complaint (name);
1670 /* Kludges for ELF/STABS with Sun ACC. */
1671 last_function_name = namestring;
1672 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
1673 value for the bottom of the text seg in those cases. */
1674 if (nlist.n_value == 0
1675 && gdbarch_sofun_address_maybe_missing (gdbarch))
1677 struct bound_minimal_symbol minsym
1678 = find_stab_function (namestring,
1679 pst ? pst->filename : NULL,
1681 if (minsym.minsym != NULL)
1682 nlist.n_value = MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym);
1684 if (pst && textlow_not_set
1685 && gdbarch_sofun_address_maybe_missing (gdbarch))
1687 pst->set_text_low (nlist.n_value);
1688 textlow_not_set = 0;
1692 /* Keep track of the start of the last function so we
1693 can handle end of function symbols. */
1694 last_function_start = nlist.n_value;
1696 /* In reordered executables this function may lie outside
1697 the bounds created by N_SO symbols. If that's the case
1698 use the address of this function as the low bound for
1699 the partial symbol table. */
1702 || (nlist.n_value < pst->raw_text_low ()
1703 && (nlist.n_value != 0))))
1705 pst->set_text_low (nlist.n_value);
1706 textlow_not_set = 0;
1708 add_psymbol_to_list (sym_name, sym_len, 1,
1709 VAR_DOMAIN, LOC_BLOCK,
1710 SECT_OFF_TEXT (objfile),
1711 psymbol_placement::GLOBAL,
1712 nlist.n_value, psymtab_language, objfile);
1715 /* Two things show up here (hopefully); static symbols of
1716 local scope (static used inside braces) or extensions
1717 of structure symbols. We can ignore both. */
1731 case '#': /* For symbol identification (used in live ranges). */
1735 /* It is a C++ nested symbol. We don't need to record it
1736 (I don't think); if we try to look up foo::bar::baz,
1737 then symbols for the symtab containing foo should get
1738 read in, I think. */
1739 /* Someone says sun cc puts out symbols like
1740 /foo/baz/maclib::/usr/local/bin/maclib,
1741 which would get here with a symbol type of ':'. */
1745 /* Unexpected symbol descriptor. The second and subsequent stabs
1746 of a continued stab can show up here. The question is
1747 whether they ever can mimic a normal stab--it would be
1748 nice if not, since we certainly don't want to spend the
1749 time searching to the end of every string looking for
1752 complaint (_("unknown symbol descriptor `%c'"),
1755 /* Ignore it; perhaps it is an extension that we don't
1763 namestring = set_namestring (objfile, &nlist);
1765 /* Find the corresponding bincl and mark that psymtab on the
1766 psymtab dependency list. */
1768 struct partial_symtab *needed_pst =
1769 find_corresponding_bincl_psymtab (namestring, nlist.n_value);
1771 /* If this include file was defined earlier in this file,
1773 if (needed_pst == pst)
1781 for (i = 0; i < dependencies_used; i++)
1782 if (dependency_list[i] == needed_pst)
1788 /* If it's already in the list, skip the rest. */
1792 dependency_list[dependencies_used++] = needed_pst;
1793 if (dependencies_used >= dependencies_allocated)
1795 struct partial_symtab **orig = dependency_list;
1798 (struct partial_symtab **)
1799 alloca ((dependencies_allocated *= 2)
1800 * sizeof (struct partial_symtab *));
1801 memcpy (dependency_list, orig,
1803 * sizeof (struct partial_symtab *)));
1805 fprintf_unfiltered (gdb_stderr,
1806 "Had to reallocate "
1807 "dependency list.\n");
1808 fprintf_unfiltered (gdb_stderr,
1809 "New dependencies allocated: %d\n",
1810 dependencies_allocated);
1818 /* Solaris 2 end of module, finish current partial symbol
1819 table. dbx_end_psymtab will set the high text address of
1820 PST to the proper value, which is necessary if a module
1821 compiled without debugging info follows this module. */
1822 if (pst && gdbarch_sofun_address_maybe_missing (gdbarch))
1824 dbx_end_psymtab (objfile, pst,
1825 psymtab_include_list, includes_used,
1826 symnum * symbol_size,
1827 (CORE_ADDR) 0, dependency_list,
1828 dependencies_used, textlow_not_set);
1829 pst = (struct partial_symtab *) 0;
1831 dependencies_used = 0;
1832 has_line_numbers = 0;
1838 HANDLE_RBRAC (nlist.n_value);
1844 case N_SSYM: /* Claim: Structure or union element.
1845 Hopefully, I can ignore this. */
1846 case N_ENTRY: /* Alternate entry point; can ignore. */
1847 case N_MAIN: /* Can definitely ignore this. */
1848 case N_CATCH: /* These are GNU C++ extensions */
1849 case N_EHDECL: /* that can safely be ignored here. */
1861 case N_NSYMS: /* Ultrix 4.0: symbol count */
1862 case N_DEFD: /* GNU Modula-2 */
1863 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */
1865 case N_OBJ: /* Useless types from Solaris. */
1868 /* These symbols aren't interesting; don't worry about them. */
1872 /* If we haven't found it yet, ignore it. It's probably some
1873 new type we don't know about yet. */
1874 unknown_symtype_complaint (hex_string (nlist.n_type));
1879 /* If there's stuff to be cleaned up, clean it up. */
1882 /* Don't set high text address of PST lower than it already
1884 CORE_ADDR text_end =
1885 (lowest_text_address == (CORE_ADDR) -1
1887 : lowest_text_address)
1890 dbx_end_psymtab (objfile, pst, psymtab_include_list, includes_used,
1891 symnum * symbol_size,
1892 (text_end > pst->raw_text_high ()
1893 ? text_end : pst->raw_text_high ()),
1894 dependency_list, dependencies_used, textlow_not_set);
1898 /* Allocate and partially fill a partial symtab. It will be
1899 completely filled at the end of the symbol list.
1901 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
1902 is the address relative to which its symbols are (incremental) or 0
1905 static struct partial_symtab *
1906 start_psymtab (struct objfile *objfile, const char *filename, CORE_ADDR textlow,
1909 struct partial_symtab *result =
1910 start_psymtab_common (objfile, filename, textlow);
1912 result->read_symtab_private =
1913 XOBNEW (&objfile->objfile_obstack, struct symloc);
1914 LDSYMOFF (result) = ldsymoff;
1915 result->read_symtab = dbx_read_symtab;
1916 SYMBOL_SIZE (result) = symbol_size;
1917 SYMBOL_OFFSET (result) = symbol_table_offset;
1918 STRING_OFFSET (result) = string_table_offset;
1919 FILE_STRING_OFFSET (result) = file_string_table_offset;
1921 /* Deduce the source language from the filename for this psymtab. */
1922 psymtab_language = deduce_language_from_filename (filename);
1923 PST_LANGUAGE (result) = psymtab_language;
1928 /* Close off the current usage of PST.
1929 Returns PST or NULL if the partial symtab was empty and thrown away.
1931 FIXME: List variables and peculiarities of same. */
1933 struct partial_symtab *
1934 dbx_end_psymtab (struct objfile *objfile, struct partial_symtab *pst,
1935 const char **include_list, int num_includes,
1936 int capping_symbol_offset, CORE_ADDR capping_text,
1937 struct partial_symtab **dependency_list,
1938 int number_dependencies,
1939 int textlow_not_set)
1942 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1944 if (capping_symbol_offset != -1)
1945 LDSYMLEN (pst) = capping_symbol_offset - LDSYMOFF (pst);
1946 pst->set_text_high (capping_text);
1948 /* Under Solaris, the N_SO symbols always have a value of 0,
1949 instead of the usual address of the .o file. Therefore,
1950 we have to do some tricks to fill in texthigh and textlow.
1951 The first trick is: if we see a static
1952 or global function, and the textlow for the current pst
1953 is not set (ie: textlow_not_set), then we use that function's
1954 address for the textlow of the pst. */
1956 /* Now, to fill in texthigh, we remember the last function seen
1957 in the .o file. Also, there's a hack in
1958 bfd/elf.c and gdb/elfread.c to pass the ELF st_size field
1959 to here via the misc_info field. Therefore, we can fill in
1960 a reliable texthigh by taking the address plus size of the
1961 last function in the file. */
1963 if (!pst->text_high_valid && last_function_name
1964 && gdbarch_sofun_address_maybe_missing (gdbarch))
1967 struct bound_minimal_symbol minsym;
1969 const char *colon = strchr (last_function_name, ':');
1973 n = colon - last_function_name;
1974 char *p = (char *) alloca (n + 2);
1975 strncpy (p, last_function_name, n);
1978 minsym = lookup_minimal_symbol (p, pst->filename, objfile);
1979 if (minsym.minsym == NULL)
1981 /* Sun Fortran appends an underscore to the minimal symbol name,
1982 try again with an appended underscore if the minimal symbol
1986 minsym = lookup_minimal_symbol (p, pst->filename, objfile);
1990 pst->set_text_high (MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym)
1991 + MSYMBOL_SIZE (minsym.minsym));
1993 last_function_name = NULL;
1996 if (!gdbarch_sofun_address_maybe_missing (gdbarch))
1998 /* This test will be true if the last .o file is only data. */
1999 else if (textlow_not_set)
2000 pst->set_text_low (pst->raw_text_high ());
2003 /* If we know our own starting text address, then walk through all other
2004 psymtabs for this objfile, and if any didn't know their ending text
2005 address, set it to our starting address. Take care to not set our
2006 own ending address to our starting address. */
2008 for (partial_symtab *p1 : objfile->psymtabs ())
2009 if (!p1->text_high_valid && p1->text_low_valid && p1 != pst)
2010 p1->set_text_high (pst->raw_text_low ());
2013 /* End of kludge for patching Solaris textlow and texthigh. */
2015 end_psymtab_common (objfile, pst);
2017 pst->number_of_dependencies = number_dependencies;
2018 if (number_dependencies)
2021 = objfile->partial_symtabs->allocate_dependencies (number_dependencies);
2022 memcpy (pst->dependencies, dependency_list,
2023 number_dependencies * sizeof (struct partial_symtab *));
2026 pst->dependencies = 0;
2028 for (i = 0; i < num_includes; i++)
2030 struct partial_symtab *subpst =
2031 allocate_psymtab (include_list[i], objfile);
2033 subpst->read_symtab_private =
2034 XOBNEW (&objfile->objfile_obstack, struct symloc);
2036 LDSYMLEN (subpst) = 0;
2038 /* We could save slight bits of space by only making one of these,
2039 shared by the entire set of include files. FIXME-someday. */
2040 subpst->dependencies =
2041 objfile->partial_symtabs->allocate_dependencies (1);
2042 subpst->dependencies[0] = pst;
2043 subpst->number_of_dependencies = 1;
2045 subpst->read_symtab = pst->read_symtab;
2048 if (num_includes == 0
2049 && number_dependencies == 0
2050 && pst->n_global_syms == 0
2051 && pst->n_static_syms == 0
2052 && has_line_numbers == 0)
2054 /* Throw away this psymtab, it's empty. We can't deallocate it, since
2055 it is on the obstack, but we can forget to chain it on the list. */
2056 /* Empty psymtabs happen as a result of header files which don't have
2057 any symbols in them. There can be a lot of them. But this check
2058 is wrong, in that a psymtab with N_SLINE entries but nothing else
2059 is not empty, but we don't realize that. Fixing that without slowing
2060 things down might be tricky. */
2062 discard_psymtab (objfile, pst);
2064 /* Indicate that psymtab was thrown away. */
2071 dbx_psymtab_to_symtab_1 (struct objfile *objfile, struct partial_symtab *pst)
2077 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. "
2078 "Shouldn't happen.\n",
2083 /* Read in all partial symtabs on which this one is dependent. */
2084 for (i = 0; i < pst->number_of_dependencies; i++)
2085 if (!pst->dependencies[i]->readin)
2087 /* Inform about additional files that need to be read in. */
2090 fputs_filtered (" ", gdb_stdout);
2092 fputs_filtered ("and ", gdb_stdout);
2094 printf_filtered ("%s...", pst->dependencies[i]->filename);
2095 wrap_here (""); /* Flush output. */
2096 gdb_flush (gdb_stdout);
2098 dbx_psymtab_to_symtab_1 (objfile, pst->dependencies[i]);
2101 if (LDSYMLEN (pst)) /* Otherwise it's a dummy. */
2103 /* Init stuff necessary for reading in symbols */
2105 scoped_free_pendings free_pending;
2106 file_string_table_offset = FILE_STRING_OFFSET (pst);
2107 symbol_size = SYMBOL_SIZE (pst);
2109 /* Read in this file's symbols. */
2110 bfd_seek (objfile->obfd, SYMBOL_OFFSET (pst), SEEK_SET);
2111 read_ofile_symtab (objfile, pst);
2117 /* Read in all of the symbols for a given psymtab for real.
2118 Be verbose about it if the user wants that. SELF is not NULL. */
2121 dbx_read_symtab (struct partial_symtab *self, struct objfile *objfile)
2125 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. "
2126 "Shouldn't happen.\n",
2131 if (LDSYMLEN (self) || self->number_of_dependencies)
2133 /* Print the message now, before reading the string table,
2134 to avoid disconcerting pauses. */
2137 printf_filtered ("Reading in symbols for %s...", self->filename);
2138 gdb_flush (gdb_stdout);
2141 next_symbol_text_func = dbx_next_symbol_text;
2144 scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data);
2145 gdb::unique_xmalloc_ptr<gdb_byte> data_holder;
2146 if (DBX_STAB_SECTION (objfile))
2149 = symfile_relocate_debug_section (objfile,
2150 DBX_STAB_SECTION (objfile),
2152 data_holder.reset (stabs_data);
2155 dbx_psymtab_to_symtab_1 (objfile, self);
2158 /* Match with global symbols. This only needs to be done once,
2159 after all of the symtabs and dependencies have been read in. */
2160 scan_file_globals (objfile);
2162 /* Finish up the debug error message. */
2164 printf_filtered ("done.\n");
2168 /* Read in a defined section of a specific object file's symbols. */
2171 read_ofile_symtab (struct objfile *objfile, struct partial_symtab *pst)
2173 const char *namestring;
2174 struct external_nlist *bufp;
2175 struct internal_nlist nlist;
2177 unsigned max_symnum;
2179 int sym_offset; /* Offset to start of symbols to read */
2180 int sym_size; /* Size of symbols to read */
2181 CORE_ADDR text_offset; /* Start of text segment for symbols */
2182 int text_size; /* Size of text segment for symbols */
2183 struct section_offsets *section_offsets;
2185 sym_offset = LDSYMOFF (pst);
2186 sym_size = LDSYMLEN (pst);
2187 text_offset = pst->text_low (objfile);
2188 text_size = pst->text_high (objfile) - pst->text_low (objfile);
2189 section_offsets = objfile->section_offsets;
2191 dbxread_objfile = objfile;
2193 stringtab_global = DBX_STRINGTAB (objfile);
2194 set_last_source_file (NULL);
2196 abfd = objfile->obfd;
2197 symfile_bfd = objfile->obfd; /* Implicit param to next_text_symbol. */
2198 symbuf_end = symbuf_idx = 0;
2200 symbuf_left = sym_offset + sym_size;
2202 /* It is necessary to actually read one symbol *before* the start
2203 of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL
2204 occurs before the N_SO symbol.
2206 Detecting this in read_dbx_symtab
2207 would slow down initial readin, so we look for it here instead. */
2208 if (!processing_acc_compilation && sym_offset >= (int) symbol_size)
2210 stabs_seek (sym_offset - symbol_size);
2212 bufp = &symbuf[symbuf_idx++];
2213 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
2214 OBJSTAT (objfile, n_stabs++);
2216 namestring = set_namestring (objfile, &nlist);
2218 processing_gcc_compilation = 0;
2219 if (nlist.n_type == N_TEXT)
2221 const char *tempstring = namestring;
2223 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0)
2224 processing_gcc_compilation = 1;
2225 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2226 processing_gcc_compilation = 2;
2227 if (tempstring[0] == bfd_get_symbol_leading_char (symfile_bfd))
2229 if (startswith (tempstring, "__gnu_compiled"))
2230 processing_gcc_compilation = 2;
2235 /* The N_SO starting this symtab is the first symbol, so we
2236 better not check the symbol before it. I'm not this can
2237 happen, but it doesn't hurt to check for it. */
2238 stabs_seek (sym_offset);
2239 processing_gcc_compilation = 0;
2242 if (symbuf_idx == symbuf_end)
2244 bufp = &symbuf[symbuf_idx];
2245 if (bfd_h_get_8 (abfd, bufp->e_type) != N_SO)
2246 error (_("First symbol in segment of executable not a source symbol"));
2248 max_symnum = sym_size / symbol_size;
2251 symnum < max_symnum;
2254 QUIT; /* Allow this to be interruptable. */
2255 if (symbuf_idx == symbuf_end)
2257 bufp = &symbuf[symbuf_idx++];
2258 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
2259 OBJSTAT (objfile, n_stabs++);
2261 type = bfd_h_get_8 (abfd, bufp->e_type);
2263 namestring = set_namestring (objfile, &nlist);
2267 if (sizeof (nlist.n_value) > 4
2268 /* We are a 64-bit debugger debugging a 32-bit program. */
2269 && (type == N_LSYM || type == N_PSYM))
2270 /* We have to be careful with the n_value in the case of N_LSYM
2271 and N_PSYM entries, because they are signed offsets from frame
2272 pointer, but we actually read them as unsigned 32-bit values.
2273 This is not a problem for 32-bit debuggers, for which negative
2274 values end up being interpreted correctly (as negative
2275 offsets) due to integer overflow.
2276 But we need to sign-extend the value for 64-bit debuggers,
2277 or we'll end up interpreting negative values as very large
2278 positive offsets. */
2279 nlist.n_value = (nlist.n_value ^ 0x80000000) - 0x80000000;
2280 process_one_symbol (type, nlist.n_desc, nlist.n_value,
2281 namestring, section_offsets, objfile,
2282 PST_LANGUAGE (pst));
2284 /* We skip checking for a new .o or -l file; that should never
2285 happen in this routine. */
2286 else if (type == N_TEXT)
2288 /* I don't think this code will ever be executed, because
2289 the GCC_COMPILED_FLAG_SYMBOL usually is right before
2290 the N_SO symbol which starts this source file.
2291 However, there is no reason not to accept
2292 the GCC_COMPILED_FLAG_SYMBOL anywhere. */
2294 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0)
2295 processing_gcc_compilation = 1;
2296 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2297 processing_gcc_compilation = 2;
2299 else if (type & N_EXT || type == (unsigned char) N_TEXT
2300 || type == (unsigned char) N_NBTEXT)
2302 /* Global symbol: see if we came across a dbx defintion for
2303 a corresponding symbol. If so, store the value. Remove
2304 syms from the chain when their values are stored, but
2305 search the whole chain, as there may be several syms from
2306 different files with the same name. */
2307 /* This is probably not true. Since the files will be read
2308 in one at a time, each reference to a global symbol will
2309 be satisfied in each file as it appears. So we skip this
2315 /* In a Solaris elf file, this variable, which comes from the value
2316 of the N_SO symbol, will still be 0. Luckily, text_offset, which
2317 comes from low text address of PST, is correct. */
2318 if (get_last_source_start_addr () == 0)
2319 set_last_source_start_addr (text_offset);
2321 /* In reordered executables last_source_start_addr may not be the
2322 lower bound for this symtab, instead use text_offset which comes
2323 from the low text address of PST, which is correct. */
2324 if (get_last_source_start_addr () > text_offset)
2325 set_last_source_start_addr (text_offset);
2327 pst->compunit_symtab = end_symtab (text_offset + text_size,
2328 SECT_OFF_TEXT (objfile));
2332 dbxread_objfile = NULL;
2336 /* Record the namespace that the function defined by SYMBOL was
2337 defined in, if necessary. BLOCK is the associated block; use
2338 OBSTACK for allocation. */
2341 cp_set_block_scope (const struct symbol *symbol,
2342 struct block *block,
2343 struct obstack *obstack)
2345 if (SYMBOL_DEMANGLED_NAME (symbol) != NULL)
2347 /* Try to figure out the appropriate namespace from the
2350 /* FIXME: carlton/2003-04-15: If the function in question is
2351 a method of a class, the name will actually include the
2352 name of the class as well. This should be harmless, but
2353 is a little unfortunate. */
2355 const char *name = SYMBOL_DEMANGLED_NAME (symbol);
2356 unsigned int prefix_len = cp_entire_prefix_len (name);
2358 block_set_scope (block,
2359 (const char *) obstack_copy0 (obstack, name, prefix_len),
2364 /* This handles a single symbol from the symbol-file, building symbols
2365 into a GDB symtab. It takes these arguments and an implicit argument.
2367 TYPE is the type field of the ".stab" symbol entry.
2368 DESC is the desc field of the ".stab" entry.
2369 VALU is the value field of the ".stab" entry.
2370 NAME is the symbol name, in our address space.
2371 SECTION_OFFSETS is a set of amounts by which the sections of this
2372 object file were relocated when it was loaded into memory. Note
2373 that these section_offsets are not the objfile->section_offsets but
2374 the pst->section_offsets. All symbols that refer to memory
2375 locations need to be offset by these amounts.
2376 OBJFILE is the object file from which we are reading symbols. It
2377 is used in end_symtab.
2378 LANGUAGE is the language of the symtab.
2382 process_one_symbol (int type, int desc, CORE_ADDR valu, const char *name,
2383 const struct section_offsets *section_offsets,
2384 struct objfile *objfile, enum language language)
2386 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2387 struct context_stack *newobj;
2388 struct context_stack cstk;
2389 /* This remembers the address of the start of a function. It is
2390 used because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries
2391 are relative to the current function's start address. On systems
2392 other than Solaris 2, this just holds the SECT_OFF_TEXT value,
2393 and is used to relocate these symbol types rather than
2395 static CORE_ADDR function_start_offset;
2397 /* This holds the address of the start of a function, without the
2398 system peculiarities of function_start_offset. */
2399 static CORE_ADDR last_function_start;
2401 /* If this is nonzero, we've seen an N_SLINE since the start of the
2402 current function. We use this to tell us to move the first sline
2403 to the beginning of the function regardless of what its given
2405 static int sline_found_in_function = 1;
2407 /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this
2408 source file. Used to detect the SunPRO solaris compiler. */
2409 static int n_opt_found;
2411 /* Something is wrong if we see real data before seeing a source
2414 if (get_last_source_file () == NULL && type != (unsigned char) N_SO)
2416 /* Ignore any symbols which appear before an N_SO symbol.
2417 Currently no one puts symbols there, but we should deal
2418 gracefully with the case. A complain()t might be in order,
2419 but this should not be an error (). */
2428 if (*name == '\000')
2430 /* This N_FUN marks the end of a function. This closes off
2431 the current block. */
2432 struct block *block;
2434 if (outermost_context_p ())
2436 lbrac_mismatch_complaint (symnum);
2440 /* The following check is added before recording line 0 at
2441 end of function so as to handle hand-generated stabs
2442 which may have an N_FUN stabs at the end of the function,
2443 but no N_SLINE stabs. */
2444 if (sline_found_in_function)
2446 CORE_ADDR addr = last_function_start + valu;
2448 record_line (get_current_subfile (), 0,
2449 gdbarch_addr_bits_remove (gdbarch, addr));
2452 within_function = 0;
2453 cstk = pop_context ();
2455 /* Make a block for the local symbols within. */
2456 block = finish_block (cstk.name,
2457 cstk.old_blocks, NULL,
2458 cstk.start_addr, cstk.start_addr + valu);
2460 /* For C++, set the block's scope. */
2461 if (SYMBOL_LANGUAGE (cstk.name) == language_cplus)
2462 cp_set_block_scope (cstk.name, block, &objfile->objfile_obstack);
2464 /* May be switching to an assembler file which may not be using
2465 block relative stabs, so reset the offset. */
2466 function_start_offset = 0;
2471 sline_found_in_function = 0;
2473 /* Relocate for dynamic loading. */
2474 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2475 valu = gdbarch_addr_bits_remove (gdbarch, valu);
2476 last_function_start = valu;
2478 goto define_a_symbol;
2481 /* This "symbol" just indicates the start of an inner lexical
2482 context within a function. */
2484 /* Ignore extra outermost context from SunPRO cc and acc. */
2485 if (n_opt_found && desc == 1)
2488 valu += function_start_offset;
2490 push_context (desc, valu);
2494 /* This "symbol" just indicates the end of an inner lexical
2495 context that was started with N_LBRAC. */
2497 /* Ignore extra outermost context from SunPRO cc and acc. */
2498 if (n_opt_found && desc == 1)
2501 valu += function_start_offset;
2503 if (outermost_context_p ())
2505 lbrac_mismatch_complaint (symnum);
2509 cstk = pop_context ();
2510 if (desc != cstk.depth)
2511 lbrac_mismatch_complaint (symnum);
2513 if (*get_local_symbols () != NULL)
2515 /* GCC development snapshots from March to December of
2516 2000 would output N_LSYM entries after N_LBRAC
2517 entries. As a consequence, these symbols are simply
2518 discarded. Complain if this is the case. */
2519 complaint (_("misplaced N_LBRAC entry; discarding local "
2520 "symbols which have no enclosing block"));
2522 *get_local_symbols () = cstk.locals;
2524 if (get_context_stack_depth () > 1)
2526 /* This is not the outermost LBRAC...RBRAC pair in the
2527 function, its local symbols preceded it, and are the ones
2528 just recovered from the context stack. Define the block
2529 for them (but don't bother if the block contains no
2530 symbols. Should we complain on blocks without symbols?
2531 I can't think of any useful purpose for them). */
2532 if (*get_local_symbols () != NULL)
2534 /* Muzzle a compiler bug that makes end < start.
2536 ??? Which compilers? Is this ever harmful?. */
2537 if (cstk.start_addr > valu)
2539 complaint (_("block start larger than block end"));
2540 cstk.start_addr = valu;
2542 /* Make a block for the local symbols within. */
2543 finish_block (0, cstk.old_blocks, NULL,
2544 cstk.start_addr, valu);
2549 /* This is the outermost LBRAC...RBRAC pair. There is no
2550 need to do anything; leave the symbols that preceded it
2551 to be attached to the function's own block. We need to
2552 indicate that we just moved outside of the function. */
2553 within_function = 0;
2560 /* This kind of symbol indicates the start of an object file.
2561 Relocate for dynamic loading. */
2562 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2566 /* This type of symbol indicates the start of data for one
2567 source file. Finish the symbol table of the previous source
2568 file (if any) and start accumulating a new symbol table.
2569 Relocate for dynamic loading. */
2570 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2574 if (get_last_source_file ())
2576 /* Check if previous symbol was also an N_SO (with some
2577 sanity checks). If so, that one was actually the
2578 directory name, and the current one is the real file
2579 name. Patch things up. */
2580 if (previous_stab_code == (unsigned char) N_SO)
2582 patch_subfile_names (get_current_subfile (), name);
2583 break; /* Ignore repeated SOs. */
2585 end_symtab (valu, SECT_OFF_TEXT (objfile));
2589 /* Null name means this just marks the end of text for this .o
2590 file. Don't start a new symtab in this case. */
2591 if (*name == '\000')
2594 function_start_offset = 0;
2597 start_symtab (objfile, name, NULL, valu, language);
2598 record_debugformat ("stabs");
2602 /* This type of symbol indicates the start of data for a
2603 sub-source-file, one whose contents were copied or included
2604 in the compilation of the main source file (whose name was
2605 given in the N_SO symbol). Relocate for dynamic loading. */
2606 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2607 start_subfile (name);
2612 add_new_header_file (name, valu);
2613 start_subfile (name);
2617 start_subfile (pop_subfile ());
2621 add_old_header_file (name, valu);
2625 /* This type of "symbol" really just records one line-number --
2626 core-address correspondence. Enter it in the line list for
2627 this symbol table. */
2629 /* Relocate for dynamic loading and for ELF acc
2630 function-relative symbols. */
2631 valu += function_start_offset;
2633 /* GCC 2.95.3 emits the first N_SLINE stab somwehere in the
2634 middle of the prologue instead of right at the start of the
2635 function. To deal with this we record the address for the
2636 first N_SLINE stab to be the start of the function instead of
2637 the listed location. We really shouldn't to this. When
2638 compiling with optimization, this first N_SLINE stab might be
2639 optimized away. Other (non-GCC) compilers don't emit this
2640 stab at all. There is no real harm in having an extra
2641 numbered line, although it can be a bit annoying for the
2642 user. However, it totally screws up our testsuite.
2644 So for now, keep adjusting the address of the first N_SLINE
2645 stab, but only for code compiled with GCC. */
2647 if (within_function && sline_found_in_function == 0)
2649 CORE_ADDR addr = processing_gcc_compilation == 2 ?
2650 last_function_start : valu;
2652 record_line (get_current_subfile (), desc,
2653 gdbarch_addr_bits_remove (gdbarch, addr));
2654 sline_found_in_function = 1;
2657 record_line (get_current_subfile (), desc,
2658 gdbarch_addr_bits_remove (gdbarch, valu));
2662 common_block_start (name, objfile);
2666 common_block_end (objfile);
2669 /* The following symbol types need to have the appropriate
2670 offset added to their value; then we process symbol
2671 definitions in the name. */
2673 case N_STSYM: /* Static symbol in data segment. */
2674 case N_LCSYM: /* Static symbol in BSS segment. */
2675 case N_ROSYM: /* Static symbol in read-only data segment. */
2676 /* HORRID HACK DEPT. However, it's Sun's furgin' fault.
2677 Solaris 2's stabs-in-elf makes *most* symbols relative but
2678 leaves a few absolute (at least for Solaris 2.1 and version
2679 2.0.1 of the SunPRO compiler). N_STSYM and friends sit on
2680 the fence. .stab "foo:S...",N_STSYM is absolute (ld
2681 relocates it) .stab "foo:V...",N_STSYM is relative (section
2682 base subtracted). This leaves us no choice but to search for
2683 the 'S' or 'V'... (or pass the whole section_offsets stuff
2684 down ONE MORE function call level, which we really don't want
2689 /* Normal object file and NLMs have non-zero text seg offsets,
2690 but don't need their static syms offset in this fashion.
2691 XXX - This is really a crock that should be fixed in the
2692 solib handling code so that I don't have to work around it
2695 if (!symfile_relocatable)
2697 p = strchr (name, ':');
2698 if (p != 0 && p[1] == 'S')
2700 /* The linker relocated it. We don't want to add a
2701 Sun-stabs Tfoo.foo-like offset, but we *do*
2702 want to add whatever solib.c passed to
2703 symbol_file_add as addr (this is known to affect
2704 SunOS 4, and I suspect ELF too). Since there is no
2705 Ttext.text symbol, we can get addr from the text offset. */
2706 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2707 goto define_a_symbol;
2710 /* Since it's not the kludge case, re-dispatch to the right
2721 internal_error (__FILE__, __LINE__,
2722 _("failed internal consistency check"));
2726 case_N_STSYM: /* Static symbol in data segment. */
2727 case N_DSLINE: /* Source line number, data segment. */
2728 valu += ANOFFSET (section_offsets, SECT_OFF_DATA (objfile));
2729 goto define_a_symbol;
2731 case_N_LCSYM: /* Static symbol in BSS segment. */
2732 case N_BSLINE: /* Source line number, BSS segment. */
2733 /* N_BROWS: overlaps with N_BSLINE. */
2734 valu += ANOFFSET (section_offsets, SECT_OFF_BSS (objfile));
2735 goto define_a_symbol;
2737 case_N_ROSYM: /* Static symbol in read-only data segment. */
2738 valu += ANOFFSET (section_offsets, SECT_OFF_RODATA (objfile));
2739 goto define_a_symbol;
2741 case N_ENTRY: /* Alternate entry point. */
2742 /* Relocate for dynamic loading. */
2743 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2744 goto define_a_symbol;
2746 /* The following symbol types we don't know how to process.
2747 Handle them in a "default" way, but complain to people who
2750 case N_CATCH: /* Exception handler catcher. */
2751 case N_EHDECL: /* Exception handler name. */
2752 case N_PC: /* Global symbol in Pascal. */
2753 case N_M2C: /* Modula-2 compilation unit. */
2754 /* N_MOD2: overlaps with N_EHDECL. */
2755 case N_SCOPE: /* Modula-2 scope information. */
2756 case N_ECOML: /* End common (local name). */
2757 case N_NBTEXT: /* Gould Non-Base-Register symbols??? */
2762 unknown_symtype_complaint (hex_string (type));
2766 /* These symbol types don't need the address field relocated,
2767 since it is either unused, or is absolute. */
2768 case N_GSYM: /* Global variable. */
2769 case N_NSYMS: /* Number of symbols (Ultrix). */
2770 case N_NOMAP: /* No map? (Ultrix). */
2771 case N_RSYM: /* Register variable. */
2772 case N_DEFD: /* Modula-2 GNU module dependency. */
2773 case N_SSYM: /* Struct or union element. */
2774 case N_LSYM: /* Local symbol in stack. */
2775 case N_PSYM: /* Parameter variable. */
2776 case N_LENG: /* Length of preceding symbol type. */
2780 const char *colon_pos = strchr (name, ':');
2782 if (colon_pos == NULL)
2785 deftype = colon_pos[1];
2791 /* Deal with the SunPRO 3.0 compiler which omits the
2792 address from N_FUN symbols. */
2794 && valu == ANOFFSET (section_offsets,
2795 SECT_OFF_TEXT (objfile))
2796 && gdbarch_sofun_address_maybe_missing (gdbarch))
2798 struct bound_minimal_symbol minsym
2799 = find_stab_function (name, get_last_source_file (),
2801 if (minsym.minsym != NULL)
2802 valu = BMSYMBOL_VALUE_ADDRESS (minsym);
2805 /* These addresses are absolute. */
2806 function_start_offset = valu;
2808 within_function = 1;
2810 if (get_context_stack_depth () > 1)
2812 complaint (_("unmatched N_LBRAC before symtab pos %d"),
2817 if (!outermost_context_p ())
2819 struct block *block;
2821 cstk = pop_context ();
2822 /* Make a block for the local symbols within. */
2823 block = finish_block (cstk.name,
2824 cstk.old_blocks, NULL,
2825 cstk.start_addr, valu);
2827 /* For C++, set the block's scope. */
2828 if (SYMBOL_LANGUAGE (cstk.name) == language_cplus)
2829 cp_set_block_scope (cstk.name, block,
2830 &objfile->objfile_obstack);
2833 newobj = push_context (0, valu);
2834 newobj->name = define_symbol (valu, name, desc, type, objfile);
2838 define_symbol (valu, name, desc, type, objfile);
2844 /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it
2845 for a bunch of other flags, too. Someday we may parse their
2846 flags; for now we ignore theirs and hope they'll ignore ours. */
2847 case N_OPT: /* Solaris 2: Compiler options. */
2850 if (strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2852 processing_gcc_compilation = 2;
2859 case N_MAIN: /* Name of main routine. */
2860 /* FIXME: If one has a symbol file with N_MAIN and then replaces
2861 it with a symbol file with "main" and without N_MAIN. I'm
2862 not sure exactly what rule to follow but probably something
2863 like: N_MAIN takes precedence over "main" no matter what
2864 objfile it is in; If there is more than one N_MAIN, choose
2865 the one in the symfile_objfile; If there is more than one
2866 N_MAIN within a given objfile, complain() and choose
2867 arbitrarily. (kingdon) */
2869 set_objfile_main_name (objfile, name, language_unknown);
2872 /* The following symbol types can be ignored. */
2873 case N_OBJ: /* Solaris 2: Object file dir and name. */
2874 case N_PATCH: /* Solaris 2: Patch Run Time Checker. */
2875 /* N_UNDF: Solaris 2: File separator mark. */
2876 /* N_UNDF: -- we will never encounter it, since we only process
2877 one file's symbols at once. */
2878 case N_ENDM: /* Solaris 2: End of module. */
2879 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */
2883 /* '#' is a GNU C extension to allow one symbol to refer to another
2886 Generally this is used so that an alias can refer to its main
2891 /* Initialize symbol reference names and determine if this is a
2892 definition. If a symbol reference is being defined, go ahead
2893 and add it. Otherwise, just return. */
2895 const char *s = name;
2898 /* If this stab defines a new reference ID that is not on the
2899 reference list, then put it on the reference list.
2901 We go ahead and advance NAME past the reference, even though
2902 it is not strictly necessary at this time. */
2903 refnum = symbol_reference_defined (&s);
2905 if (!ref_search (refnum))
2906 ref_add (refnum, 0, name, valu);
2910 previous_stab_code = type;
2913 /* FIXME: The only difference between this and elfstab_build_psymtabs
2914 is the call to install_minimal_symbols for elf, and the support for
2915 split sections. If the differences are really that small, the code
2916 should be shared. */
2918 /* Scan and build partial symbols for an coff symbol file.
2919 The coff file has already been processed to get its minimal symbols.
2921 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
2924 OBJFILE is the object file we are reading symbols from.
2925 ADDR is the address relative to which the symbols are (e.g.
2926 the base address of the text segment).
2927 TEXTADDR is the address of the text section.
2928 TEXTSIZE is the size of the text section.
2929 STABSECTS is the list of .stab sections in OBJFILE.
2930 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
2931 .stabstr section exists.
2933 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
2934 adjusted for coff details. */
2937 coffstab_build_psymtabs (struct objfile *objfile,
2938 CORE_ADDR textaddr, unsigned int textsize,
2939 const std::vector<asection *> &stabsects,
2940 file_ptr stabstroffset, unsigned int stabstrsize)
2943 bfd *sym_bfd = objfile->obfd;
2944 char *name = bfd_get_filename (sym_bfd);
2945 unsigned int stabsize;
2947 /* Allocate struct to keep track of stab reading. */
2948 dbx_objfile_data_key.emplace (objfile);
2950 DBX_TEXT_ADDR (objfile) = textaddr;
2951 DBX_TEXT_SIZE (objfile) = textsize;
2953 #define COFF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */
2954 DBX_SYMBOL_SIZE (objfile) = COFF_STABS_SYMBOL_SIZE;
2955 DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
2957 if (stabstrsize > bfd_get_size (sym_bfd))
2958 error (_("ridiculous string table size: %d bytes"), stabstrsize);
2959 DBX_STRINGTAB (objfile) = (char *)
2960 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1);
2961 OBJSTAT (objfile, sz_strtab += stabstrsize + 1);
2963 /* Now read in the string table in one big gulp. */
2965 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET);
2967 perror_with_name (name);
2968 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd);
2969 if (val != stabstrsize)
2970 perror_with_name (name);
2972 stabsread_new_init ();
2973 free_header_files ();
2974 init_header_files ();
2976 processing_acc_compilation = 1;
2978 /* In a coff file, we've already installed the minimal symbols that came
2979 from the coff (non-stab) symbol table, so always act like an
2980 incremental load here. */
2981 scoped_restore save_symbuf_sections
2982 = make_scoped_restore (&symbuf_sections);
2983 if (stabsects.size () == 1)
2985 stabsize = bfd_section_size (sym_bfd, stabsects[0]);
2986 DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile);
2987 DBX_SYMTAB_OFFSET (objfile) = stabsects[0]->filepos;
2991 DBX_SYMCOUNT (objfile) = 0;
2992 for (asection *section : stabsects)
2994 stabsize = bfd_section_size (sym_bfd, section);
2995 DBX_SYMCOUNT (objfile) += stabsize / DBX_SYMBOL_SIZE (objfile);
2998 DBX_SYMTAB_OFFSET (objfile) = stabsects[0]->filepos;
3001 symbuf_sections = &stabsects;
3002 symbuf_left = bfd_section_size (sym_bfd, stabsects[0]);
3006 dbx_symfile_read (objfile, 0);
3009 /* Scan and build partial symbols for an ELF symbol file.
3010 This ELF file has already been processed to get its minimal symbols.
3012 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
3015 OBJFILE is the object file we are reading symbols from.
3016 ADDR is the address relative to which the symbols are (e.g.
3017 the base address of the text segment).
3018 STABSECT is the BFD section information for the .stab section.
3019 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
3020 .stabstr section exists.
3022 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
3023 adjusted for elf details. */
3026 elfstab_build_psymtabs (struct objfile *objfile, asection *stabsect,
3027 file_ptr stabstroffset, unsigned int stabstrsize)
3030 bfd *sym_bfd = objfile->obfd;
3031 char *name = bfd_get_filename (sym_bfd);
3033 stabsread_new_init ();
3035 /* Allocate struct to keep track of stab reading. */
3036 dbx_objfile_data_key.emplace (objfile);
3038 /* Find the first and last text address. dbx_symfile_read seems to
3040 find_text_range (sym_bfd, objfile);
3042 #define ELF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */
3043 DBX_SYMBOL_SIZE (objfile) = ELF_STABS_SYMBOL_SIZE;
3044 DBX_SYMCOUNT (objfile)
3045 = bfd_section_size (objfile->obfd, stabsect) / DBX_SYMBOL_SIZE (objfile);
3046 DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
3047 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos;
3048 DBX_STAB_SECTION (objfile) = stabsect;
3050 if (stabstrsize > bfd_get_size (sym_bfd))
3051 error (_("ridiculous string table size: %d bytes"), stabstrsize);
3052 DBX_STRINGTAB (objfile) = (char *)
3053 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1);
3054 OBJSTAT (objfile, sz_strtab += stabstrsize + 1);
3056 /* Now read in the string table in one big gulp. */
3058 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET);
3060 perror_with_name (name);
3061 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd);
3062 if (val != stabstrsize)
3063 perror_with_name (name);
3065 stabsread_new_init ();
3066 free_header_files ();
3067 init_header_files ();
3069 processing_acc_compilation = 1;
3072 symbuf_left = bfd_section_size (objfile->obfd, stabsect);
3074 scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data);
3075 gdb::unique_xmalloc_ptr<gdb_byte> data_holder;
3077 stabs_data = symfile_relocate_debug_section (objfile, stabsect, NULL);
3079 data_holder.reset (stabs_data);
3081 /* In an elf file, we've already installed the minimal symbols that came
3082 from the elf (non-stab) symbol table, so always act like an
3083 incremental load here. dbx_symfile_read should not generate any new
3084 minimal symbols, since we will have already read the ELF dynamic symbol
3085 table and normal symbol entries won't be in the ".stab" section; but in
3086 case it does, it will install them itself. */
3087 dbx_symfile_read (objfile, 0);
3090 /* Scan and build partial symbols for a file with special sections for stabs
3091 and stabstrings. The file has already been processed to get its minimal
3092 symbols, and any other symbols that might be necessary to resolve GSYMs.
3094 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
3097 OBJFILE is the object file we are reading symbols from.
3098 ADDR is the address relative to which the symbols are (e.g. the base address
3099 of the text segment).
3100 STAB_NAME is the name of the section that contains the stabs.
3101 STABSTR_NAME is the name of the section that contains the stab strings.
3103 This routine is mostly copied from dbx_symfile_init and
3104 dbx_symfile_read. */
3107 stabsect_build_psymtabs (struct objfile *objfile, char *stab_name,
3108 char *stabstr_name, char *text_name)
3111 bfd *sym_bfd = objfile->obfd;
3112 char *name = bfd_get_filename (sym_bfd);
3114 asection *stabstrsect;
3115 asection *text_sect;
3117 stabsect = bfd_get_section_by_name (sym_bfd, stab_name);
3118 stabstrsect = bfd_get_section_by_name (sym_bfd, stabstr_name);
3124 error (_("stabsect_build_psymtabs: Found stabs (%s), "
3125 "but not string section (%s)"),
3126 stab_name, stabstr_name);
3128 dbx_objfile_data_key.emplace (objfile);
3130 text_sect = bfd_get_section_by_name (sym_bfd, text_name);
3132 error (_("Can't find %s section in symbol file"), text_name);
3133 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect);
3134 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect);
3136 DBX_SYMBOL_SIZE (objfile) = sizeof (struct external_nlist);
3137 DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect)
3138 / DBX_SYMBOL_SIZE (objfile);
3139 DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stabstrsect);
3140 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; /* XXX - FIXME: POKING
3144 if (DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
3145 error (_("ridiculous string table size: %d bytes"),
3146 DBX_STRINGTAB_SIZE (objfile));
3147 DBX_STRINGTAB (objfile) = (char *)
3148 obstack_alloc (&objfile->objfile_obstack,
3149 DBX_STRINGTAB_SIZE (objfile) + 1);
3150 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile) + 1);
3152 /* Now read in the string table in one big gulp. */
3154 val = bfd_get_section_contents (sym_bfd, /* bfd */
3155 stabstrsect, /* bfd section */
3156 DBX_STRINGTAB (objfile), /* input buffer */
3157 0, /* offset into section */
3158 DBX_STRINGTAB_SIZE (objfile)); /* amount to
3162 perror_with_name (name);
3164 stabsread_new_init ();
3165 free_header_files ();
3166 init_header_files ();
3168 /* Now, do an incremental load. */
3170 processing_acc_compilation = 1;
3171 dbx_symfile_read (objfile, 0);
3174 static const struct sym_fns aout_sym_fns =
3176 dbx_new_init, /* init anything gbl to entire symtab */
3177 dbx_symfile_init, /* read initial info, setup for sym_read() */
3178 dbx_symfile_read, /* read a symbol file into symtab */
3179 NULL, /* sym_read_psymbols */
3180 dbx_symfile_finish, /* finished with file, cleanup */
3181 default_symfile_offsets, /* parse user's offsets to internal form */
3182 default_symfile_segments, /* Get segment information from a file. */
3184 default_symfile_relocate, /* Relocate a debug section. */
3185 NULL, /* sym_probe_fns */
3190 _initialize_dbxread (void)
3192 add_symtab_fns (bfd_target_aout_flavour, &aout_sym_fns);