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 const struct objfile_data *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 if (objfile->global_psymbols.capacity () == 0
540 && objfile->static_psymbols.capacity () == 0)
541 init_psymbol_list (objfile, DBX_SYMCOUNT (objfile));
543 symbol_size = DBX_SYMBOL_SIZE (objfile);
544 symbol_table_offset = DBX_SYMTAB_OFFSET (objfile);
546 scoped_free_pendings free_pending;
548 minimal_symbol_reader reader (objfile);
550 /* Read stabs data from executable file and define symbols. */
552 read_dbx_symtab (reader, objfile);
554 /* Install any minimal symbols that have been collected as the current
555 minimal symbols for this objfile. */
560 /* Initialize anything that needs initializing when a completely new
561 symbol file is specified (not just adding some symbols from another
562 file, e.g. a shared library). */
565 dbx_new_init (struct objfile *ignore)
567 stabsread_new_init ();
568 init_header_files ();
572 /* dbx_symfile_init ()
573 is the dbx-specific initialization routine for reading symbols.
574 It is passed a struct objfile which contains, among other things,
575 the BFD for the file whose symbols are being read, and a slot for a pointer
576 to "private data" which we fill with goodies.
578 We read the string table into malloc'd space and stash a pointer to it.
580 Since BFD doesn't know how to read debug symbols in a format-independent
581 way (and may never do so...), we have to do it ourselves. We will never
582 be called unless this is an a.out (or very similar) file.
583 FIXME, there should be a cleaner peephole into the BFD environment here. */
585 #define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */
588 dbx_symfile_init (struct objfile *objfile)
591 bfd *sym_bfd = objfile->obfd;
592 char *name = bfd_get_filename (sym_bfd);
594 unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE];
595 struct dbx_symfile_info *dbx;
597 /* Allocate struct to keep track of the symfile. */
598 dbx = XCNEW (struct dbx_symfile_info);
599 set_objfile_data (objfile, dbx_objfile_data_key, dbx);
601 DBX_TEXT_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
602 DBX_DATA_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".data");
603 DBX_BSS_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".bss");
605 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */
606 #define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd))
607 #define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd))
609 /* FIXME POKING INSIDE BFD DATA STRUCTURES. */
611 text_sect = bfd_get_section_by_name (sym_bfd, ".text");
613 error (_("Can't find .text section in symbol file"));
614 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect);
615 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect);
617 DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd);
618 DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd);
619 DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
621 /* Read the string table and stash it away in the objfile_obstack.
622 When we blow away the objfile the string table goes away as well.
623 Note that gdb used to use the results of attempting to malloc the
624 string table, based on the size it read, as a form of sanity check
625 for botched byte swapping, on the theory that a byte swapped string
626 table size would be so totally bogus that the malloc would fail. Now
627 that we put in on the objfile_obstack, we can't do this since gdb gets
628 a fatal error (out of virtual memory) if the size is bogus. We can
629 however at least check to see if the size is less than the size of
630 the size field itself, or larger than the size of the entire file.
631 Note that all valid string tables have a size greater than zero, since
632 the bytes used to hold the size are included in the count. */
634 if (STRING_TABLE_OFFSET == 0)
636 /* It appears that with the existing bfd code, STRING_TABLE_OFFSET
637 will never be zero, even when there is no string table. This
638 would appear to be a bug in bfd. */
639 DBX_STRINGTAB_SIZE (objfile) = 0;
640 DBX_STRINGTAB (objfile) = NULL;
644 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
646 perror_with_name (name);
648 memset (size_temp, 0, sizeof (size_temp));
649 val = bfd_bread (size_temp, sizeof (size_temp), sym_bfd);
652 perror_with_name (name);
656 /* With the existing bfd code, STRING_TABLE_OFFSET will be set to
657 EOF if there is no string table, and attempting to read the size
658 from EOF will read zero bytes. */
659 DBX_STRINGTAB_SIZE (objfile) = 0;
660 DBX_STRINGTAB (objfile) = NULL;
664 /* Read some data that would appear to be the string table size.
665 If there really is a string table, then it is probably the right
666 size. Byteswap if necessary and validate the size. Note that
667 the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some
668 random data that happened to be at STRING_TABLE_OFFSET, because
669 bfd can't tell us there is no string table, the sanity checks may
670 or may not catch this. */
671 DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp);
673 if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp)
674 || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
675 error (_("ridiculous string table size (%d bytes)."),
676 DBX_STRINGTAB_SIZE (objfile));
678 DBX_STRINGTAB (objfile) =
679 (char *) obstack_alloc (&objfile->objfile_obstack,
680 DBX_STRINGTAB_SIZE (objfile));
681 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile));
683 /* Now read in the string table in one big gulp. */
685 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET);
687 perror_with_name (name);
688 val = bfd_bread (DBX_STRINGTAB (objfile),
689 DBX_STRINGTAB_SIZE (objfile),
691 if (val != DBX_STRINGTAB_SIZE (objfile))
692 perror_with_name (name);
697 /* Perform any local cleanups required when we are done with a particular
698 objfile. I.E, we are in the process of discarding all symbol information
699 for an objfile, freeing up all memory held for it, and unlinking the
700 objfile struct from the global list of known objfiles. */
703 dbx_symfile_finish (struct objfile *objfile)
705 free_header_files ();
709 dbx_free_symfile_info (struct objfile *objfile, void *arg)
711 struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) arg;
713 if (dbx->header_files != NULL)
715 int i = dbx->n_header_files;
716 struct header_file *hfiles = dbx->header_files;
720 xfree (hfiles[i].name);
721 xfree (hfiles[i].vector);
731 /* Buffer for reading the symbol table entries. */
732 static struct external_nlist symbuf[4096];
733 static int symbuf_idx;
734 static int symbuf_end;
736 /* Name of last function encountered. Used in Solaris to approximate
737 object file boundaries. */
738 static const char *last_function_name;
740 /* The address in memory of the string table of the object file we are
741 reading (which might not be the "main" object file, but might be a
742 shared library or some other dynamically loaded thing). This is
743 set by read_dbx_symtab when building psymtabs, and by
744 read_ofile_symtab when building symtabs, and is used only by
745 next_symbol_text. FIXME: If that is true, we don't need it when
746 building psymtabs, right? */
747 static char *stringtab_global;
749 /* These variables are used to control fill_symbuf when the stabs
750 symbols are not contiguous (as may be the case when a COFF file is
751 linked using --split-by-reloc). */
752 static struct stab_section_list *symbuf_sections;
753 static unsigned int symbuf_left;
754 static unsigned int symbuf_read;
756 /* This variable stores a global stabs buffer, if we read stabs into
757 memory in one chunk in order to process relocations. */
758 static bfd_byte *stabs_data;
760 /* Refill the symbol table input buffer
761 and set the variables that control fetching entries from it.
762 Reports an error if no data available.
763 This function can read past the end of the symbol table
764 (into the string table) but this does no harm. */
767 fill_symbuf (bfd *sym_bfd)
774 nbytes = sizeof (symbuf);
775 if (nbytes > symbuf_left)
776 nbytes = symbuf_left;
777 memcpy (symbuf, stabs_data + symbuf_read, nbytes);
779 else if (symbuf_sections == NULL)
781 count = sizeof (symbuf);
782 nbytes = bfd_bread (symbuf, count, sym_bfd);
786 if (symbuf_left <= 0)
788 file_ptr filepos = symbuf_sections->section->filepos;
790 if (bfd_seek (sym_bfd, filepos, SEEK_SET) != 0)
791 perror_with_name (bfd_get_filename (sym_bfd));
792 symbuf_left = bfd_section_size (sym_bfd, symbuf_sections->section);
793 symbol_table_offset = filepos - symbuf_read;
794 symbuf_sections = symbuf_sections->next;
798 if (count > sizeof (symbuf))
799 count = sizeof (symbuf);
800 nbytes = bfd_bread (symbuf, count, sym_bfd);
804 perror_with_name (bfd_get_filename (sym_bfd));
805 else if (nbytes == 0)
806 error (_("Premature end of file reading symbol table"));
807 symbuf_end = nbytes / symbol_size;
809 symbuf_left -= nbytes;
810 symbuf_read += nbytes;
814 stabs_seek (int sym_offset)
818 symbuf_read += sym_offset;
819 symbuf_left -= sym_offset;
822 bfd_seek (symfile_bfd, sym_offset, SEEK_CUR);
825 #define INTERNALIZE_SYMBOL(intern, extern, abfd) \
827 (intern).n_strx = bfd_h_get_32 (abfd, (extern)->e_strx); \
828 (intern).n_type = bfd_h_get_8 (abfd, (extern)->e_type); \
829 (intern).n_other = 0; \
830 (intern).n_desc = bfd_h_get_16 (abfd, (extern)->e_desc); \
831 if (bfd_get_sign_extend_vma (abfd)) \
832 (intern).n_value = bfd_h_get_signed_32 (abfd, (extern)->e_value); \
834 (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \
837 /* Invariant: The symbol pointed to by symbuf_idx is the first one
838 that hasn't been swapped. Swap the symbol at the same time
839 that symbuf_idx is incremented. */
841 /* dbx allows the text of a symbol name to be continued into the
842 next symbol name! When such a continuation is encountered
843 (a \ at the end of the text of a name)
844 call this function to get the continuation. */
847 dbx_next_symbol_text (struct objfile *objfile)
849 struct internal_nlist nlist;
851 if (symbuf_idx == symbuf_end)
852 fill_symbuf (symfile_bfd);
855 INTERNALIZE_SYMBOL (nlist, &symbuf[symbuf_idx], symfile_bfd);
856 OBJSTAT (objfile, n_stabs++);
860 return nlist.n_strx + stringtab_global + file_string_table_offset;
864 /* Given a name, value pair, find the corresponding
865 bincl in the list. Return the partial symtab associated
866 with that header_file_location. */
868 static struct partial_symtab *
869 find_corresponding_bincl_psymtab (const char *name, int instance)
871 for (const header_file_location &bincl : *bincl_list)
872 if (bincl.instance == instance
873 && strcmp (name, bincl.name) == 0)
876 repeated_header_complaint (name, symnum);
877 return (struct partial_symtab *) 0;
880 /* Set namestring based on nlist. If the string table index is invalid,
881 give a fake name, and print a single error message per symbol file read,
882 rather than abort the symbol reading or flood the user with messages. */
885 set_namestring (struct objfile *objfile, const struct internal_nlist *nlist)
887 const char *namestring;
889 if (nlist->n_strx + file_string_table_offset
890 >= DBX_STRINGTAB_SIZE (objfile)
891 || nlist->n_strx + file_string_table_offset < nlist->n_strx)
893 complaint (_("bad string table offset in symbol %d"),
895 namestring = "<bad string table offset>";
898 namestring = (nlist->n_strx + file_string_table_offset
899 + DBX_STRINGTAB (objfile));
903 static struct bound_minimal_symbol
904 find_stab_function (const char *namestring, const char *filename,
905 struct objfile *objfile)
907 struct bound_minimal_symbol msym;
910 const char *colon = strchr (namestring, ':');
914 n = colon - namestring;
916 char *p = (char *) alloca (n + 2);
917 strncpy (p, namestring, n);
920 msym = lookup_minimal_symbol (p, filename, objfile);
921 if (msym.minsym == NULL)
923 /* Sun Fortran appends an underscore to the minimal symbol name,
924 try again with an appended underscore if the minimal symbol
928 msym = lookup_minimal_symbol (p, filename, objfile);
931 if (msym.minsym == NULL && filename != NULL)
933 /* Try again without the filename. */
935 msym = lookup_minimal_symbol (p, NULL, objfile);
937 if (msym.minsym == NULL && filename != NULL)
939 /* And try again for Sun Fortran, but without the filename. */
942 msym = lookup_minimal_symbol (p, NULL, objfile);
949 function_outside_compilation_unit_complaint (const char *arg1)
951 complaint (_("function `%s' appears to be defined "
952 "outside of all compilation units"),
956 /* Setup partial_symtab's describing each source file for which
957 debugging information is available. */
960 read_dbx_symtab (minimal_symbol_reader &reader, struct objfile *objfile)
962 struct gdbarch *gdbarch = get_objfile_arch (objfile);
963 struct external_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch. */
964 struct internal_nlist nlist;
967 const char *sym_name;
970 const char *namestring;
972 int past_first_source_file = 0;
973 CORE_ADDR last_function_start = 0;
978 /* Current partial symtab. */
979 struct partial_symtab *pst;
981 /* List of current psymtab's include files. */
982 const char **psymtab_include_list;
983 int includes_allocated;
986 /* Index within current psymtab dependency list. */
987 struct partial_symtab **dependency_list;
988 int dependencies_used, dependencies_allocated;
990 text_addr = DBX_TEXT_ADDR (objfile);
991 text_size = DBX_TEXT_SIZE (objfile);
993 /* FIXME. We probably want to change stringtab_global rather than add this
994 while processing every symbol entry. FIXME. */
995 file_string_table_offset = 0;
996 next_file_string_table_offset = 0;
998 stringtab_global = DBX_STRINGTAB (objfile);
1000 pst = (struct partial_symtab *) 0;
1002 includes_allocated = 30;
1004 psymtab_include_list = (const char **) alloca (includes_allocated *
1005 sizeof (const char *));
1007 dependencies_allocated = 30;
1008 dependencies_used = 0;
1010 (struct partial_symtab **) alloca (dependencies_allocated *
1011 sizeof (struct partial_symtab *));
1013 /* Init bincl list */
1014 std::vector<struct header_file_location> bincl_storage;
1015 scoped_restore restore_bincl_global
1016 = make_scoped_restore (&bincl_list, &bincl_storage);
1018 set_last_source_file (NULL);
1020 lowest_text_address = (CORE_ADDR) -1;
1022 symfile_bfd = objfile->obfd; /* For next_text_symbol. */
1023 abfd = objfile->obfd;
1024 symbuf_end = symbuf_idx = 0;
1025 next_symbol_text_func = dbx_next_symbol_text;
1026 textlow_not_set = 1;
1027 has_line_numbers = 0;
1029 /* FIXME: jimb/2003-09-12: We don't apply the right section's offset
1030 to global and static variables. The stab for a global or static
1031 variable doesn't give us any indication of which section it's in,
1032 so we can't tell immediately which offset in
1033 objfile->section_offsets we should apply to the variable's
1036 We could certainly find out which section contains the variable
1037 by looking up the variable's unrelocated address with
1038 find_pc_section, but that would be expensive; this is the
1039 function that constructs the partial symbol tables by examining
1040 every symbol in the entire executable, and it's
1041 performance-critical. So that expense would not be welcome. I'm
1042 not sure what to do about this at the moment.
1044 What we have done for years is to simply assume that the .data
1045 section's offset is appropriate for all global and static
1046 variables. Recently, this was expanded to fall back to the .bss
1047 section's offset if there is no .data section, and then to the
1048 .rodata section's offset. */
1049 data_sect_index = objfile->sect_index_data;
1050 if (data_sect_index == -1)
1051 data_sect_index = SECT_OFF_BSS (objfile);
1052 if (data_sect_index == -1)
1053 data_sect_index = SECT_OFF_RODATA (objfile);
1055 /* If data_sect_index is still -1, that's okay. It's perfectly fine
1056 for the file to have no .data, no .bss, and no .text at all, if
1057 it also has no global or static variables. If it does, we will
1058 get an internal error from an ANOFFSET macro below when we try to
1059 use data_sect_index. */
1061 for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++)
1063 /* Get the symbol for this run and pull out some info. */
1064 QUIT; /* Allow this to be interruptable. */
1065 if (symbuf_idx == symbuf_end)
1067 bufp = &symbuf[symbuf_idx++];
1070 * Special case to speed up readin.
1072 if (bfd_h_get_8 (abfd, bufp->e_type) == N_SLINE)
1074 has_line_numbers = 1;
1078 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
1079 OBJSTAT (objfile, n_stabs++);
1081 /* Ok. There is a lot of code duplicated in the rest of this
1082 switch statement (for efficiency reasons). Since I don't
1083 like duplicating code, I will do my penance here, and
1084 describe the code which is duplicated:
1086 *) The assignment to namestring.
1087 *) The call to strchr.
1088 *) The addition of a partial symbol the two partial
1089 symbol lists. This last is a large section of code, so
1090 I've imbedded it in the following macro. */
1092 switch (nlist.n_type)
1095 * Standard, external, non-debugger, symbols
1098 case N_TEXT | N_EXT:
1099 case N_NBTEXT | N_EXT:
1102 case N_DATA | N_EXT:
1103 case N_NBDATA | N_EXT:
1108 case N_NBBSS | N_EXT:
1109 case N_SETV | N_EXT: /* FIXME, is this in BSS? */
1114 namestring = set_namestring (objfile, &nlist);
1116 record_minimal_symbol (reader, namestring, nlist.n_value,
1117 nlist.n_type, objfile); /* Always */
1120 /* Standard, local, non-debugger, symbols. */
1124 /* We need to be able to deal with both N_FN or N_TEXT,
1125 because we have no way of knowing whether the sys-supplied ld
1126 or GNU ld was used to make the executable. Sequents throw
1127 in another wrinkle -- they renumbered N_FN. */
1132 namestring = set_namestring (objfile, &nlist);
1134 if ((namestring[0] == '-' && namestring[1] == 'l')
1135 || (namestring[(nsl = strlen (namestring)) - 1] == 'o'
1136 && namestring[nsl - 2] == '.'))
1138 if (past_first_source_file && pst
1139 /* The gould NP1 uses low values for .o and -l symbols
1140 which are not the address. */
1141 && nlist.n_value >= pst->raw_text_low ())
1143 dbx_end_psymtab (objfile, pst, psymtab_include_list,
1144 includes_used, symnum * symbol_size,
1145 nlist.n_value > pst->raw_text_high ()
1146 ? nlist.n_value : pst->raw_text_high (),
1147 dependency_list, dependencies_used,
1149 pst = (struct partial_symtab *) 0;
1151 dependencies_used = 0;
1152 has_line_numbers = 0;
1155 past_first_source_file = 1;
1164 case N_UNDF | N_EXT:
1165 /* The case (nlist.n_value != 0) is a "Fortran COMMON" symbol.
1166 We used to rely on the target to tell us whether it knows
1167 where the symbol has been relocated to, but none of the
1168 target implementations actually provided that operation.
1169 So we just ignore the symbol, the same way we would do if
1170 we had a target-side symbol lookup which returned no match.
1172 All other symbols (with nlist.n_value == 0), are really
1173 undefined, and so we ignore them too. */
1177 if (processing_acc_compilation && nlist.n_strx == 1)
1179 /* Deal with relative offsets in the string table
1180 used in ELF+STAB under Solaris. If we want to use the
1181 n_strx field, which contains the name of the file,
1182 we must adjust file_string_table_offset *before* calling
1183 set_namestring(). */
1184 past_first_source_file = 1;
1185 file_string_table_offset = next_file_string_table_offset;
1186 next_file_string_table_offset =
1187 file_string_table_offset + nlist.n_value;
1188 if (next_file_string_table_offset < file_string_table_offset)
1189 error (_("string table offset backs up at %d"), symnum);
1190 /* FIXME -- replace error() with complaint. */
1195 /* Lots of symbol types we can just ignore. */
1202 /* Keep going . . . */
1205 * Special symbol types for GNU
1208 case N_INDR | N_EXT:
1210 case N_SETA | N_EXT:
1212 case N_SETT | N_EXT:
1214 case N_SETD | N_EXT:
1216 case N_SETB | N_EXT:
1227 static int prev_so_symnum = -10;
1228 static int first_so_symnum;
1230 static const char *dirname_nso;
1231 int prev_textlow_not_set;
1233 valu = nlist.n_value;
1235 prev_textlow_not_set = textlow_not_set;
1237 /* A zero value is probably an indication for the SunPRO 3.0
1238 compiler. dbx_end_psymtab explicitly tests for zero, so
1239 don't relocate it. */
1241 if (nlist.n_value == 0
1242 && gdbarch_sofun_address_maybe_missing (gdbarch))
1244 textlow_not_set = 1;
1248 textlow_not_set = 0;
1250 past_first_source_file = 1;
1252 if (prev_so_symnum != symnum - 1)
1253 { /* Here if prev stab wasn't N_SO. */
1254 first_so_symnum = symnum;
1258 dbx_end_psymtab (objfile, pst, psymtab_include_list,
1259 includes_used, symnum * symbol_size,
1260 (valu > pst->raw_text_high ()
1261 ? valu : pst->raw_text_high ()),
1262 dependency_list, dependencies_used,
1263 prev_textlow_not_set);
1264 pst = (struct partial_symtab *) 0;
1266 dependencies_used = 0;
1267 has_line_numbers = 0;
1271 prev_so_symnum = symnum;
1273 /* End the current partial symtab and start a new one. */
1275 namestring = set_namestring (objfile, &nlist);
1277 /* Null name means end of .o file. Don't start a new one. */
1278 if (*namestring == '\000')
1281 /* Some compilers (including gcc) emit a pair of initial N_SOs.
1282 The first one is a directory name; the second the file name.
1283 If pst exists, is empty, and has a filename ending in '/',
1284 we assume the previous N_SO was a directory name. */
1286 p = lbasename (namestring);
1287 if (p != namestring && *p == '\000')
1289 /* Save the directory name SOs locally, then save it into
1290 the psymtab when it's created below. */
1291 dirname_nso = namestring;
1295 /* Some other compilers (C++ ones in particular) emit useless
1296 SOs for non-existant .c files. We ignore all subsequent SOs
1297 that immediately follow the first. */
1301 pst = start_psymtab (objfile,
1303 first_so_symnum * symbol_size);
1304 pst->dirname = dirname_nso;
1312 enum language tmp_language;
1314 /* Add this bincl to the bincl_list for future EXCLs. No
1315 need to save the string; it'll be around until
1316 read_dbx_symtab function returns. */
1318 namestring = set_namestring (objfile, &nlist);
1319 tmp_language = deduce_language_from_filename (namestring);
1321 /* Only change the psymtab's language if we've learned
1322 something useful (eg. tmp_language is not language_unknown).
1323 In addition, to match what start_subfile does, never change
1325 if (tmp_language != language_unknown
1326 && (tmp_language != language_c
1327 || psymtab_language != language_cplus))
1328 psymtab_language = tmp_language;
1332 /* FIXME: we should not get here without a PST to work on.
1333 Attempt to recover. */
1334 complaint (_("N_BINCL %s not in entries for "
1335 "any file, at symtab pos %d"),
1336 namestring, symnum);
1339 bincl_list->emplace_back (namestring, nlist.n_value, pst);
1341 /* Mark down an include file in the current psymtab. */
1343 goto record_include_file;
1348 enum language tmp_language;
1350 /* Mark down an include file in the current psymtab. */
1351 namestring = set_namestring (objfile, &nlist);
1352 tmp_language = deduce_language_from_filename (namestring);
1354 /* Only change the psymtab's language if we've learned
1355 something useful (eg. tmp_language is not language_unknown).
1356 In addition, to match what start_subfile does, never change
1358 if (tmp_language != language_unknown
1359 && (tmp_language != language_c
1360 || psymtab_language != language_cplus))
1361 psymtab_language = tmp_language;
1363 /* In C++, one may expect the same filename to come round many
1364 times, when code is coming alternately from the main file
1365 and from inline functions in other files. So I check to see
1366 if this is a file we've seen before -- either the main
1367 source file, or a previously included file.
1369 This seems to be a lot of time to be spending on N_SOL, but
1370 things like "break c-exp.y:435" need to work (I
1371 suppose the psymtab_include_list could be hashed or put
1372 in a binary tree, if profiling shows this is a major hog). */
1373 if (pst && filename_cmp (namestring, pst->filename) == 0)
1378 for (i = 0; i < includes_used; i++)
1379 if (filename_cmp (namestring, psymtab_include_list[i]) == 0)
1388 record_include_file:
1390 psymtab_include_list[includes_used++] = namestring;
1391 if (includes_used >= includes_allocated)
1393 const char **orig = psymtab_include_list;
1395 psymtab_include_list = (const char **)
1396 alloca ((includes_allocated *= 2) * sizeof (const char *));
1397 memcpy (psymtab_include_list, orig,
1398 includes_used * sizeof (const char *));
1402 case N_LSYM: /* Typedef or automatic variable. */
1403 case N_STSYM: /* Data seg var -- static. */
1404 case N_LCSYM: /* BSS " */
1405 case N_ROSYM: /* Read-only data seg var -- static. */
1406 case N_NBSTS: /* Gould nobase. */
1407 case N_NBLCS: /* symbols. */
1409 case N_GSYM: /* Global (extern) variable; can be
1410 data or bss (sigh FIXME). */
1412 /* Following may probably be ignored; I'll leave them here
1413 for now (until I do Pascal and Modula 2 extensions). */
1415 case N_PC: /* I may or may not need this; I
1417 case N_M2C: /* I suspect that I can ignore this here. */
1418 case N_SCOPE: /* Same. */
1422 namestring = set_namestring (objfile, &nlist);
1424 /* See if this is an end of function stab. */
1425 if (pst && nlist.n_type == N_FUN && *namestring == '\000')
1429 /* It's value is the size (in bytes) of the function for
1430 function relative stabs, or the address of the function's
1431 end for old style stabs. */
1432 valu = nlist.n_value + last_function_start;
1433 if (pst->raw_text_high () == 0 || valu > pst->raw_text_high ())
1434 pst->set_text_high (valu);
1438 p = (char *) strchr (namestring, ':');
1440 continue; /* Not a debugging symbol. */
1443 sym_name = NULL; /* pacify "gcc -Werror" */
1444 if (psymtab_language == language_cplus)
1446 std::string name (namestring, p - namestring);
1447 std::string new_name = cp_canonicalize_string (name.c_str ());
1448 if (!new_name.empty ())
1450 sym_len = new_name.length ();
1451 sym_name = (char *) obstack_copy0 (&objfile->objfile_obstack,
1459 sym_name = namestring;
1460 sym_len = p - namestring;
1463 /* Main processing section for debugging symbols which
1464 the initial read through the symbol tables needs to worry
1465 about. If we reach this point, the symbol which we are
1466 considering is definitely one we are interested in.
1467 p must also contain the (valid) index into the namestring
1468 which indicates the debugging type symbol. */
1473 if (gdbarch_static_transform_name_p (gdbarch))
1474 gdbarch_static_transform_name (gdbarch, namestring);
1476 add_psymbol_to_list (sym_name, sym_len, 1,
1477 VAR_DOMAIN, LOC_STATIC,
1479 psymbol_placement::STATIC,
1480 nlist.n_value, psymtab_language, objfile);
1484 /* The addresses in these entries are reported to be
1485 wrong. See the code that reads 'G's for symtabs. */
1486 add_psymbol_to_list (sym_name, sym_len, 1,
1487 VAR_DOMAIN, LOC_STATIC,
1489 psymbol_placement::GLOBAL,
1490 nlist.n_value, psymtab_language, objfile);
1494 /* When a 'T' entry is defining an anonymous enum, it
1495 may have a name which is the empty string, or a
1496 single space. Since they're not really defining a
1497 symbol, those shouldn't go in the partial symbol
1498 table. We do pick up the elements of such enums at
1499 'check_enum:', below. */
1500 if (p >= namestring + 2
1501 || (p == namestring + 1
1502 && namestring[0] != ' '))
1504 add_psymbol_to_list (sym_name, sym_len, 1,
1505 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
1506 psymbol_placement::STATIC,
1507 0, psymtab_language, objfile);
1510 /* Also a typedef with the same name. */
1511 add_psymbol_to_list (sym_name, sym_len, 1,
1512 VAR_DOMAIN, LOC_TYPEDEF, -1,
1513 psymbol_placement::STATIC,
1514 0, psymtab_language, objfile);
1521 if (p != namestring) /* a name is there, not just :T... */
1523 add_psymbol_to_list (sym_name, sym_len, 1,
1524 VAR_DOMAIN, LOC_TYPEDEF, -1,
1525 psymbol_placement::STATIC,
1526 0, psymtab_language, objfile);
1529 /* If this is an enumerated type, we need to
1530 add all the enum constants to the partial symbol
1531 table. This does not cover enums without names, e.g.
1532 "enum {a, b} c;" in C, but fortunately those are
1533 rare. There is no way for GDB to find those from the
1534 enum type without spending too much time on it. Thus
1535 to solve this problem, the compiler needs to put out the
1536 enum in a nameless type. GCC2 does this. */
1538 /* We are looking for something of the form
1539 <name> ":" ("t" | "T") [<number> "="] "e"
1540 {<constant> ":" <value> ","} ";". */
1542 /* Skip over the colon and the 't' or 'T'. */
1544 /* This type may be given a number. Also, numbers can come
1545 in pairs like (0,26). Skip over it. */
1546 while ((*p >= '0' && *p <= '9')
1547 || *p == '(' || *p == ',' || *p == ')'
1553 /* The aix4 compiler emits extra crud before the members. */
1556 /* Skip over the type (?). */
1560 /* Skip over the colon. */
1564 /* We have found an enumerated type. */
1565 /* According to comments in read_enum_type
1566 a comma could end it instead of a semicolon.
1567 I don't know where that happens.
1569 while (*p && *p != ';' && *p != ',')
1573 /* Check for and handle cretinous dbx symbol name
1575 if (*p == '\\' || (*p == '?' && p[1] == '\0'))
1576 p = next_symbol_text (objfile);
1578 /* Point to the character after the name
1579 of the enum constant. */
1580 for (q = p; *q && *q != ':'; q++)
1582 /* Note that the value doesn't matter for
1583 enum constants in psymtabs, just in symtabs. */
1584 add_psymbol_to_list (p, q - p, 1,
1585 VAR_DOMAIN, LOC_CONST, -1,
1586 psymbol_placement::STATIC, 0,
1587 psymtab_language, objfile);
1588 /* Point past the name. */
1590 /* Skip over the value. */
1591 while (*p && *p != ',')
1593 /* Advance past the comma. */
1601 /* Constant, e.g. from "const" in Pascal. */
1602 add_psymbol_to_list (sym_name, sym_len, 1,
1603 VAR_DOMAIN, LOC_CONST, -1,
1604 psymbol_placement::STATIC, 0,
1605 psymtab_language, objfile);
1611 int name_len = p - namestring;
1612 char *name = (char *) xmalloc (name_len + 1);
1614 memcpy (name, namestring, name_len);
1615 name[name_len] = '\0';
1616 function_outside_compilation_unit_complaint (name);
1619 /* Kludges for ELF/STABS with Sun ACC. */
1620 last_function_name = namestring;
1621 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
1622 value for the bottom of the text seg in those cases. */
1623 if (nlist.n_value == 0
1624 && gdbarch_sofun_address_maybe_missing (gdbarch))
1626 struct bound_minimal_symbol minsym
1627 = find_stab_function (namestring,
1628 pst ? pst->filename : NULL,
1630 if (minsym.minsym != NULL)
1631 nlist.n_value = MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym);
1633 if (pst && textlow_not_set
1634 && gdbarch_sofun_address_maybe_missing (gdbarch))
1636 pst->set_text_low (nlist.n_value);
1637 textlow_not_set = 0;
1641 /* Keep track of the start of the last function so we
1642 can handle end of function symbols. */
1643 last_function_start = nlist.n_value;
1645 /* In reordered executables this function may lie outside
1646 the bounds created by N_SO symbols. If that's the case
1647 use the address of this function as the low bound for
1648 the partial symbol table. */
1651 || (nlist.n_value < pst->raw_text_low ()
1652 && (nlist.n_value != 0))))
1654 pst->set_text_low (nlist.n_value);
1655 textlow_not_set = 0;
1657 add_psymbol_to_list (sym_name, sym_len, 1,
1658 VAR_DOMAIN, LOC_BLOCK,
1659 SECT_OFF_TEXT (objfile),
1660 psymbol_placement::STATIC,
1661 nlist.n_value, psymtab_language, objfile);
1664 /* Global functions were ignored here, but now they
1665 are put into the global psymtab like one would expect.
1666 They're also in the minimal symbol table. */
1670 int name_len = p - namestring;
1671 char *name = (char *) xmalloc (name_len + 1);
1673 memcpy (name, namestring, name_len);
1674 name[name_len] = '\0';
1675 function_outside_compilation_unit_complaint (name);
1678 /* Kludges for ELF/STABS with Sun ACC. */
1679 last_function_name = namestring;
1680 /* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
1681 value for the bottom of the text seg in those cases. */
1682 if (nlist.n_value == 0
1683 && gdbarch_sofun_address_maybe_missing (gdbarch))
1685 struct bound_minimal_symbol minsym
1686 = find_stab_function (namestring,
1687 pst ? pst->filename : NULL,
1689 if (minsym.minsym != NULL)
1690 nlist.n_value = MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym);
1692 if (pst && textlow_not_set
1693 && gdbarch_sofun_address_maybe_missing (gdbarch))
1695 pst->set_text_low (nlist.n_value);
1696 textlow_not_set = 0;
1700 /* Keep track of the start of the last function so we
1701 can handle end of function symbols. */
1702 last_function_start = nlist.n_value;
1704 /* In reordered executables this function may lie outside
1705 the bounds created by N_SO symbols. If that's the case
1706 use the address of this function as the low bound for
1707 the partial symbol table. */
1710 || (nlist.n_value < pst->raw_text_low ()
1711 && (nlist.n_value != 0))))
1713 pst->set_text_low (nlist.n_value);
1714 textlow_not_set = 0;
1716 add_psymbol_to_list (sym_name, sym_len, 1,
1717 VAR_DOMAIN, LOC_BLOCK,
1718 SECT_OFF_TEXT (objfile),
1719 psymbol_placement::GLOBAL,
1720 nlist.n_value, psymtab_language, objfile);
1723 /* Two things show up here (hopefully); static symbols of
1724 local scope (static used inside braces) or extensions
1725 of structure symbols. We can ignore both. */
1739 case '#': /* For symbol identification (used in live ranges). */
1743 /* It is a C++ nested symbol. We don't need to record it
1744 (I don't think); if we try to look up foo::bar::baz,
1745 then symbols for the symtab containing foo should get
1746 read in, I think. */
1747 /* Someone says sun cc puts out symbols like
1748 /foo/baz/maclib::/usr/local/bin/maclib,
1749 which would get here with a symbol type of ':'. */
1753 /* Unexpected symbol descriptor. The second and subsequent stabs
1754 of a continued stab can show up here. The question is
1755 whether they ever can mimic a normal stab--it would be
1756 nice if not, since we certainly don't want to spend the
1757 time searching to the end of every string looking for
1760 complaint (_("unknown symbol descriptor `%c'"),
1763 /* Ignore it; perhaps it is an extension that we don't
1771 namestring = set_namestring (objfile, &nlist);
1773 /* Find the corresponding bincl and mark that psymtab on the
1774 psymtab dependency list. */
1776 struct partial_symtab *needed_pst =
1777 find_corresponding_bincl_psymtab (namestring, nlist.n_value);
1779 /* If this include file was defined earlier in this file,
1781 if (needed_pst == pst)
1789 for (i = 0; i < dependencies_used; i++)
1790 if (dependency_list[i] == needed_pst)
1796 /* If it's already in the list, skip the rest. */
1800 dependency_list[dependencies_used++] = needed_pst;
1801 if (dependencies_used >= dependencies_allocated)
1803 struct partial_symtab **orig = dependency_list;
1806 (struct partial_symtab **)
1807 alloca ((dependencies_allocated *= 2)
1808 * sizeof (struct partial_symtab *));
1809 memcpy (dependency_list, orig,
1811 * sizeof (struct partial_symtab *)));
1813 fprintf_unfiltered (gdb_stderr,
1814 "Had to reallocate "
1815 "dependency list.\n");
1816 fprintf_unfiltered (gdb_stderr,
1817 "New dependencies allocated: %d\n",
1818 dependencies_allocated);
1826 /* Solaris 2 end of module, finish current partial symbol
1827 table. dbx_end_psymtab will set the high text address of
1828 PST to the proper value, which is necessary if a module
1829 compiled without debugging info follows this module. */
1830 if (pst && gdbarch_sofun_address_maybe_missing (gdbarch))
1832 dbx_end_psymtab (objfile, pst,
1833 psymtab_include_list, includes_used,
1834 symnum * symbol_size,
1835 (CORE_ADDR) 0, dependency_list,
1836 dependencies_used, textlow_not_set);
1837 pst = (struct partial_symtab *) 0;
1839 dependencies_used = 0;
1840 has_line_numbers = 0;
1846 HANDLE_RBRAC (nlist.n_value);
1852 case N_SSYM: /* Claim: Structure or union element.
1853 Hopefully, I can ignore this. */
1854 case N_ENTRY: /* Alternate entry point; can ignore. */
1855 case N_MAIN: /* Can definitely ignore this. */
1856 case N_CATCH: /* These are GNU C++ extensions */
1857 case N_EHDECL: /* that can safely be ignored here. */
1869 case N_NSYMS: /* Ultrix 4.0: symbol count */
1870 case N_DEFD: /* GNU Modula-2 */
1871 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */
1873 case N_OBJ: /* Useless types from Solaris. */
1876 /* These symbols aren't interesting; don't worry about them. */
1880 /* If we haven't found it yet, ignore it. It's probably some
1881 new type we don't know about yet. */
1882 unknown_symtype_complaint (hex_string (nlist.n_type));
1887 /* If there's stuff to be cleaned up, clean it up. */
1890 /* Don't set high text address of PST lower than it already
1892 CORE_ADDR text_end =
1893 (lowest_text_address == (CORE_ADDR) -1
1895 : lowest_text_address)
1898 dbx_end_psymtab (objfile, pst, psymtab_include_list, includes_used,
1899 symnum * symbol_size,
1900 (text_end > pst->raw_text_high ()
1901 ? text_end : pst->raw_text_high ()),
1902 dependency_list, dependencies_used, textlow_not_set);
1906 /* Allocate and partially fill a partial symtab. It will be
1907 completely filled at the end of the symbol list.
1909 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
1910 is the address relative to which its symbols are (incremental) or 0
1913 static struct partial_symtab *
1914 start_psymtab (struct objfile *objfile, const char *filename, CORE_ADDR textlow,
1917 struct partial_symtab *result =
1918 start_psymtab_common (objfile, filename, textlow);
1920 result->read_symtab_private =
1921 XOBNEW (&objfile->objfile_obstack, struct symloc);
1922 LDSYMOFF (result) = ldsymoff;
1923 result->read_symtab = dbx_read_symtab;
1924 SYMBOL_SIZE (result) = symbol_size;
1925 SYMBOL_OFFSET (result) = symbol_table_offset;
1926 STRING_OFFSET (result) = string_table_offset;
1927 FILE_STRING_OFFSET (result) = file_string_table_offset;
1929 /* Deduce the source language from the filename for this psymtab. */
1930 psymtab_language = deduce_language_from_filename (filename);
1931 PST_LANGUAGE (result) = psymtab_language;
1936 /* Close off the current usage of PST.
1937 Returns PST or NULL if the partial symtab was empty and thrown away.
1939 FIXME: List variables and peculiarities of same. */
1941 struct partial_symtab *
1942 dbx_end_psymtab (struct objfile *objfile, struct partial_symtab *pst,
1943 const char **include_list, int num_includes,
1944 int capping_symbol_offset, CORE_ADDR capping_text,
1945 struct partial_symtab **dependency_list,
1946 int number_dependencies,
1947 int textlow_not_set)
1950 struct gdbarch *gdbarch = get_objfile_arch (objfile);
1952 if (capping_symbol_offset != -1)
1953 LDSYMLEN (pst) = capping_symbol_offset - LDSYMOFF (pst);
1954 pst->set_text_high (capping_text);
1956 /* Under Solaris, the N_SO symbols always have a value of 0,
1957 instead of the usual address of the .o file. Therefore,
1958 we have to do some tricks to fill in texthigh and textlow.
1959 The first trick is: if we see a static
1960 or global function, and the textlow for the current pst
1961 is not set (ie: textlow_not_set), then we use that function's
1962 address for the textlow of the pst. */
1964 /* Now, to fill in texthigh, we remember the last function seen
1965 in the .o file. Also, there's a hack in
1966 bfd/elf.c and gdb/elfread.c to pass the ELF st_size field
1967 to here via the misc_info field. Therefore, we can fill in
1968 a reliable texthigh by taking the address plus size of the
1969 last function in the file. */
1971 if (!pst->text_high_valid && last_function_name
1972 && gdbarch_sofun_address_maybe_missing (gdbarch))
1975 struct bound_minimal_symbol minsym;
1977 const char *colon = strchr (last_function_name, ':');
1981 n = colon - last_function_name;
1982 char *p = (char *) alloca (n + 2);
1983 strncpy (p, last_function_name, n);
1986 minsym = lookup_minimal_symbol (p, pst->filename, objfile);
1987 if (minsym.minsym == NULL)
1989 /* Sun Fortran appends an underscore to the minimal symbol name,
1990 try again with an appended underscore if the minimal symbol
1994 minsym = lookup_minimal_symbol (p, pst->filename, objfile);
1998 pst->set_text_high (MSYMBOL_VALUE_RAW_ADDRESS (minsym.minsym)
1999 + MSYMBOL_SIZE (minsym.minsym));
2001 last_function_name = NULL;
2004 if (!gdbarch_sofun_address_maybe_missing (gdbarch))
2006 /* This test will be true if the last .o file is only data. */
2007 else if (textlow_not_set)
2008 pst->set_text_low (pst->raw_text_high ());
2011 /* If we know our own starting text address, then walk through all other
2012 psymtabs for this objfile, and if any didn't know their ending text
2013 address, set it to our starting address. Take care to not set our
2014 own ending address to our starting address. */
2016 for (partial_symtab *p1 : objfile_psymtabs (objfile))
2017 if (!p1->text_high_valid && p1->text_low_valid && p1 != pst)
2018 p1->set_text_high (pst->raw_text_low ());
2021 /* End of kludge for patching Solaris textlow and texthigh. */
2023 end_psymtab_common (objfile, pst);
2025 pst->number_of_dependencies = number_dependencies;
2026 if (number_dependencies)
2028 pst->dependencies = XOBNEWVEC (&objfile->objfile_obstack,
2029 struct partial_symtab *,
2030 number_dependencies);
2031 memcpy (pst->dependencies, dependency_list,
2032 number_dependencies * sizeof (struct partial_symtab *));
2035 pst->dependencies = 0;
2037 for (i = 0; i < num_includes; i++)
2039 struct partial_symtab *subpst =
2040 allocate_psymtab (include_list[i], objfile);
2042 subpst->read_symtab_private =
2043 XOBNEW (&objfile->objfile_obstack, struct symloc);
2045 LDSYMLEN (subpst) = 0;
2047 /* We could save slight bits of space by only making one of these,
2048 shared by the entire set of include files. FIXME-someday. */
2049 subpst->dependencies =
2050 XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
2051 subpst->dependencies[0] = pst;
2052 subpst->number_of_dependencies = 1;
2054 subpst->read_symtab = pst->read_symtab;
2057 if (num_includes == 0
2058 && number_dependencies == 0
2059 && pst->n_global_syms == 0
2060 && pst->n_static_syms == 0
2061 && has_line_numbers == 0)
2063 /* Throw away this psymtab, it's empty. We can't deallocate it, since
2064 it is on the obstack, but we can forget to chain it on the list. */
2065 /* Empty psymtabs happen as a result of header files which don't have
2066 any symbols in them. There can be a lot of them. But this check
2067 is wrong, in that a psymtab with N_SLINE entries but nothing else
2068 is not empty, but we don't realize that. Fixing that without slowing
2069 things down might be tricky. */
2071 discard_psymtab (objfile, pst);
2073 /* Indicate that psymtab was thrown away. */
2080 dbx_psymtab_to_symtab_1 (struct objfile *objfile, struct partial_symtab *pst)
2086 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. "
2087 "Shouldn't happen.\n",
2092 /* Read in all partial symtabs on which this one is dependent. */
2093 for (i = 0; i < pst->number_of_dependencies; i++)
2094 if (!pst->dependencies[i]->readin)
2096 /* Inform about additional files that need to be read in. */
2099 fputs_filtered (" ", gdb_stdout);
2101 fputs_filtered ("and ", gdb_stdout);
2103 printf_filtered ("%s...", pst->dependencies[i]->filename);
2104 wrap_here (""); /* Flush output. */
2105 gdb_flush (gdb_stdout);
2107 dbx_psymtab_to_symtab_1 (objfile, pst->dependencies[i]);
2110 if (LDSYMLEN (pst)) /* Otherwise it's a dummy. */
2112 /* Init stuff necessary for reading in symbols */
2114 scoped_free_pendings free_pending;
2115 file_string_table_offset = FILE_STRING_OFFSET (pst);
2116 symbol_size = SYMBOL_SIZE (pst);
2118 /* Read in this file's symbols. */
2119 bfd_seek (objfile->obfd, SYMBOL_OFFSET (pst), SEEK_SET);
2120 read_ofile_symtab (objfile, pst);
2126 /* Read in all of the symbols for a given psymtab for real.
2127 Be verbose about it if the user wants that. SELF is not NULL. */
2130 dbx_read_symtab (struct partial_symtab *self, struct objfile *objfile)
2134 fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. "
2135 "Shouldn't happen.\n",
2140 if (LDSYMLEN (self) || self->number_of_dependencies)
2142 /* Print the message now, before reading the string table,
2143 to avoid disconcerting pauses. */
2146 printf_filtered ("Reading in symbols for %s...", self->filename);
2147 gdb_flush (gdb_stdout);
2150 next_symbol_text_func = dbx_next_symbol_text;
2153 scoped_restore restore_stabs_data = make_scoped_restore (&stabs_data);
2154 gdb::unique_xmalloc_ptr<gdb_byte> data_holder;
2155 if (DBX_STAB_SECTION (objfile))
2158 = symfile_relocate_debug_section (objfile,
2159 DBX_STAB_SECTION (objfile),
2161 data_holder.reset (stabs_data);
2164 dbx_psymtab_to_symtab_1 (objfile, self);
2167 /* Match with global symbols. This only needs to be done once,
2168 after all of the symtabs and dependencies have been read in. */
2169 scan_file_globals (objfile);
2171 /* Finish up the debug error message. */
2173 printf_filtered ("done.\n");
2177 /* Read in a defined section of a specific object file's symbols. */
2180 read_ofile_symtab (struct objfile *objfile, struct partial_symtab *pst)
2182 const char *namestring;
2183 struct external_nlist *bufp;
2184 struct internal_nlist nlist;
2186 unsigned max_symnum;
2188 int sym_offset; /* Offset to start of symbols to read */
2189 int sym_size; /* Size of symbols to read */
2190 CORE_ADDR text_offset; /* Start of text segment for symbols */
2191 int text_size; /* Size of text segment for symbols */
2192 struct section_offsets *section_offsets;
2194 sym_offset = LDSYMOFF (pst);
2195 sym_size = LDSYMLEN (pst);
2196 text_offset = pst->text_low (objfile);
2197 text_size = pst->text_high (objfile) - pst->text_low (objfile);
2198 section_offsets = objfile->section_offsets;
2200 dbxread_objfile = objfile;
2202 stringtab_global = DBX_STRINGTAB (objfile);
2203 set_last_source_file (NULL);
2205 abfd = objfile->obfd;
2206 symfile_bfd = objfile->obfd; /* Implicit param to next_text_symbol. */
2207 symbuf_end = symbuf_idx = 0;
2209 symbuf_left = sym_offset + sym_size;
2211 /* It is necessary to actually read one symbol *before* the start
2212 of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL
2213 occurs before the N_SO symbol.
2215 Detecting this in read_dbx_symtab
2216 would slow down initial readin, so we look for it here instead. */
2217 if (!processing_acc_compilation && sym_offset >= (int) symbol_size)
2219 stabs_seek (sym_offset - symbol_size);
2221 bufp = &symbuf[symbuf_idx++];
2222 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
2223 OBJSTAT (objfile, n_stabs++);
2225 namestring = set_namestring (objfile, &nlist);
2227 processing_gcc_compilation = 0;
2228 if (nlist.n_type == N_TEXT)
2230 const char *tempstring = namestring;
2232 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0)
2233 processing_gcc_compilation = 1;
2234 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2235 processing_gcc_compilation = 2;
2236 if (tempstring[0] == bfd_get_symbol_leading_char (symfile_bfd))
2238 if (startswith (tempstring, "__gnu_compiled"))
2239 processing_gcc_compilation = 2;
2244 /* The N_SO starting this symtab is the first symbol, so we
2245 better not check the symbol before it. I'm not this can
2246 happen, but it doesn't hurt to check for it. */
2247 stabs_seek (sym_offset);
2248 processing_gcc_compilation = 0;
2251 if (symbuf_idx == symbuf_end)
2253 bufp = &symbuf[symbuf_idx];
2254 if (bfd_h_get_8 (abfd, bufp->e_type) != N_SO)
2255 error (_("First symbol in segment of executable not a source symbol"));
2257 max_symnum = sym_size / symbol_size;
2260 symnum < max_symnum;
2263 QUIT; /* Allow this to be interruptable. */
2264 if (symbuf_idx == symbuf_end)
2266 bufp = &symbuf[symbuf_idx++];
2267 INTERNALIZE_SYMBOL (nlist, bufp, abfd);
2268 OBJSTAT (objfile, n_stabs++);
2270 type = bfd_h_get_8 (abfd, bufp->e_type);
2272 namestring = set_namestring (objfile, &nlist);
2276 if (sizeof (nlist.n_value) > 4
2277 /* We are a 64-bit debugger debugging a 32-bit program. */
2278 && (type == N_LSYM || type == N_PSYM))
2279 /* We have to be careful with the n_value in the case of N_LSYM
2280 and N_PSYM entries, because they are signed offsets from frame
2281 pointer, but we actually read them as unsigned 32-bit values.
2282 This is not a problem for 32-bit debuggers, for which negative
2283 values end up being interpreted correctly (as negative
2284 offsets) due to integer overflow.
2285 But we need to sign-extend the value for 64-bit debuggers,
2286 or we'll end up interpreting negative values as very large
2287 positive offsets. */
2288 nlist.n_value = (nlist.n_value ^ 0x80000000) - 0x80000000;
2289 process_one_symbol (type, nlist.n_desc, nlist.n_value,
2290 namestring, section_offsets, objfile,
2291 PST_LANGUAGE (pst));
2293 /* We skip checking for a new .o or -l file; that should never
2294 happen in this routine. */
2295 else if (type == N_TEXT)
2297 /* I don't think this code will ever be executed, because
2298 the GCC_COMPILED_FLAG_SYMBOL usually is right before
2299 the N_SO symbol which starts this source file.
2300 However, there is no reason not to accept
2301 the GCC_COMPILED_FLAG_SYMBOL anywhere. */
2303 if (strcmp (namestring, GCC_COMPILED_FLAG_SYMBOL) == 0)
2304 processing_gcc_compilation = 1;
2305 else if (strcmp (namestring, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2306 processing_gcc_compilation = 2;
2308 else if (type & N_EXT || type == (unsigned char) N_TEXT
2309 || type == (unsigned char) N_NBTEXT)
2311 /* Global symbol: see if we came across a dbx defintion for
2312 a corresponding symbol. If so, store the value. Remove
2313 syms from the chain when their values are stored, but
2314 search the whole chain, as there may be several syms from
2315 different files with the same name. */
2316 /* This is probably not true. Since the files will be read
2317 in one at a time, each reference to a global symbol will
2318 be satisfied in each file as it appears. So we skip this
2324 /* In a Solaris elf file, this variable, which comes from the value
2325 of the N_SO symbol, will still be 0. Luckily, text_offset, which
2326 comes from low text address of PST, is correct. */
2327 if (get_last_source_start_addr () == 0)
2328 set_last_source_start_addr (text_offset);
2330 /* In reordered executables last_source_start_addr may not be the
2331 lower bound for this symtab, instead use text_offset which comes
2332 from the low text address of PST, which is correct. */
2333 if (get_last_source_start_addr () > text_offset)
2334 set_last_source_start_addr (text_offset);
2336 pst->compunit_symtab = end_symtab (text_offset + text_size,
2337 SECT_OFF_TEXT (objfile));
2341 dbxread_objfile = NULL;
2345 /* Record the namespace that the function defined by SYMBOL was
2346 defined in, if necessary. BLOCK is the associated block; use
2347 OBSTACK for allocation. */
2350 cp_set_block_scope (const struct symbol *symbol,
2351 struct block *block,
2352 struct obstack *obstack)
2354 if (SYMBOL_DEMANGLED_NAME (symbol) != NULL)
2356 /* Try to figure out the appropriate namespace from the
2359 /* FIXME: carlton/2003-04-15: If the function in question is
2360 a method of a class, the name will actually include the
2361 name of the class as well. This should be harmless, but
2362 is a little unfortunate. */
2364 const char *name = SYMBOL_DEMANGLED_NAME (symbol);
2365 unsigned int prefix_len = cp_entire_prefix_len (name);
2367 block_set_scope (block,
2368 (const char *) obstack_copy0 (obstack, name, prefix_len),
2373 /* This handles a single symbol from the symbol-file, building symbols
2374 into a GDB symtab. It takes these arguments and an implicit argument.
2376 TYPE is the type field of the ".stab" symbol entry.
2377 DESC is the desc field of the ".stab" entry.
2378 VALU is the value field of the ".stab" entry.
2379 NAME is the symbol name, in our address space.
2380 SECTION_OFFSETS is a set of amounts by which the sections of this
2381 object file were relocated when it was loaded into memory. Note
2382 that these section_offsets are not the objfile->section_offsets but
2383 the pst->section_offsets. All symbols that refer to memory
2384 locations need to be offset by these amounts.
2385 OBJFILE is the object file from which we are reading symbols. It
2386 is used in end_symtab.
2387 LANGUAGE is the language of the symtab.
2391 process_one_symbol (int type, int desc, CORE_ADDR valu, const char *name,
2392 const struct section_offsets *section_offsets,
2393 struct objfile *objfile, enum language language)
2395 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2396 struct context_stack *newobj;
2397 struct context_stack cstk;
2398 /* This remembers the address of the start of a function. It is
2399 used because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries
2400 are relative to the current function's start address. On systems
2401 other than Solaris 2, this just holds the SECT_OFF_TEXT value,
2402 and is used to relocate these symbol types rather than
2404 static CORE_ADDR function_start_offset;
2406 /* This holds the address of the start of a function, without the
2407 system peculiarities of function_start_offset. */
2408 static CORE_ADDR last_function_start;
2410 /* If this is nonzero, we've seen an N_SLINE since the start of the
2411 current function. We use this to tell us to move the first sline
2412 to the beginning of the function regardless of what its given
2414 static int sline_found_in_function = 1;
2416 /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this
2417 source file. Used to detect the SunPRO solaris compiler. */
2418 static int n_opt_found;
2420 /* Something is wrong if we see real data before seeing a source
2423 if (get_last_source_file () == NULL && type != (unsigned char) N_SO)
2425 /* Ignore any symbols which appear before an N_SO symbol.
2426 Currently no one puts symbols there, but we should deal
2427 gracefully with the case. A complain()t might be in order,
2428 but this should not be an error (). */
2437 if (*name == '\000')
2439 /* This N_FUN marks the end of a function. This closes off
2440 the current block. */
2441 struct block *block;
2443 if (outermost_context_p ())
2445 lbrac_mismatch_complaint (symnum);
2449 /* The following check is added before recording line 0 at
2450 end of function so as to handle hand-generated stabs
2451 which may have an N_FUN stabs at the end of the function,
2452 but no N_SLINE stabs. */
2453 if (sline_found_in_function)
2455 CORE_ADDR addr = last_function_start + valu;
2457 record_line (get_current_subfile (), 0,
2458 gdbarch_addr_bits_remove (gdbarch, addr));
2461 within_function = 0;
2462 cstk = pop_context ();
2464 /* Make a block for the local symbols within. */
2465 block = finish_block (cstk.name,
2466 cstk.old_blocks, NULL,
2467 cstk.start_addr, cstk.start_addr + valu);
2469 /* For C++, set the block's scope. */
2470 if (SYMBOL_LANGUAGE (cstk.name) == language_cplus)
2471 cp_set_block_scope (cstk.name, block, &objfile->objfile_obstack);
2473 /* May be switching to an assembler file which may not be using
2474 block relative stabs, so reset the offset. */
2475 function_start_offset = 0;
2480 sline_found_in_function = 0;
2482 /* Relocate for dynamic loading. */
2483 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2484 valu = gdbarch_addr_bits_remove (gdbarch, valu);
2485 last_function_start = valu;
2487 goto define_a_symbol;
2490 /* This "symbol" just indicates the start of an inner lexical
2491 context within a function. */
2493 /* Ignore extra outermost context from SunPRO cc and acc. */
2494 if (n_opt_found && desc == 1)
2497 valu += function_start_offset;
2499 push_context (desc, valu);
2503 /* This "symbol" just indicates the end of an inner lexical
2504 context that was started with N_LBRAC. */
2506 /* Ignore extra outermost context from SunPRO cc and acc. */
2507 if (n_opt_found && desc == 1)
2510 valu += function_start_offset;
2512 if (outermost_context_p ())
2514 lbrac_mismatch_complaint (symnum);
2518 cstk = pop_context ();
2519 if (desc != cstk.depth)
2520 lbrac_mismatch_complaint (symnum);
2522 if (*get_local_symbols () != NULL)
2524 /* GCC development snapshots from March to December of
2525 2000 would output N_LSYM entries after N_LBRAC
2526 entries. As a consequence, these symbols are simply
2527 discarded. Complain if this is the case. */
2528 complaint (_("misplaced N_LBRAC entry; discarding local "
2529 "symbols which have no enclosing block"));
2531 *get_local_symbols () = cstk.locals;
2533 if (get_context_stack_depth () > 1)
2535 /* This is not the outermost LBRAC...RBRAC pair in the
2536 function, its local symbols preceded it, and are the ones
2537 just recovered from the context stack. Define the block
2538 for them (but don't bother if the block contains no
2539 symbols. Should we complain on blocks without symbols?
2540 I can't think of any useful purpose for them). */
2541 if (*get_local_symbols () != NULL)
2543 /* Muzzle a compiler bug that makes end < start.
2545 ??? Which compilers? Is this ever harmful?. */
2546 if (cstk.start_addr > valu)
2548 complaint (_("block start larger than block end"));
2549 cstk.start_addr = valu;
2551 /* Make a block for the local symbols within. */
2552 finish_block (0, cstk.old_blocks, NULL,
2553 cstk.start_addr, valu);
2558 /* This is the outermost LBRAC...RBRAC pair. There is no
2559 need to do anything; leave the symbols that preceded it
2560 to be attached to the function's own block. We need to
2561 indicate that we just moved outside of the function. */
2562 within_function = 0;
2569 /* This kind of symbol indicates the start of an object file.
2570 Relocate for dynamic loading. */
2571 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2575 /* This type of symbol indicates the start of data for one
2576 source file. Finish the symbol table of the previous source
2577 file (if any) and start accumulating a new symbol table.
2578 Relocate for dynamic loading. */
2579 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2583 if (get_last_source_file ())
2585 /* Check if previous symbol was also an N_SO (with some
2586 sanity checks). If so, that one was actually the
2587 directory name, and the current one is the real file
2588 name. Patch things up. */
2589 if (previous_stab_code == (unsigned char) N_SO)
2591 patch_subfile_names (get_current_subfile (), name);
2592 break; /* Ignore repeated SOs. */
2594 end_symtab (valu, SECT_OFF_TEXT (objfile));
2598 /* Null name means this just marks the end of text for this .o
2599 file. Don't start a new symtab in this case. */
2600 if (*name == '\000')
2603 function_start_offset = 0;
2606 start_symtab (objfile, name, NULL, valu, language);
2607 record_debugformat ("stabs");
2611 /* This type of symbol indicates the start of data for a
2612 sub-source-file, one whose contents were copied or included
2613 in the compilation of the main source file (whose name was
2614 given in the N_SO symbol). Relocate for dynamic loading. */
2615 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2616 start_subfile (name);
2621 add_new_header_file (name, valu);
2622 start_subfile (name);
2626 start_subfile (pop_subfile ());
2630 add_old_header_file (name, valu);
2634 /* This type of "symbol" really just records one line-number --
2635 core-address correspondence. Enter it in the line list for
2636 this symbol table. */
2638 /* Relocate for dynamic loading and for ELF acc
2639 function-relative symbols. */
2640 valu += function_start_offset;
2642 /* GCC 2.95.3 emits the first N_SLINE stab somwehere in the
2643 middle of the prologue instead of right at the start of the
2644 function. To deal with this we record the address for the
2645 first N_SLINE stab to be the start of the function instead of
2646 the listed location. We really shouldn't to this. When
2647 compiling with optimization, this first N_SLINE stab might be
2648 optimized away. Other (non-GCC) compilers don't emit this
2649 stab at all. There is no real harm in having an extra
2650 numbered line, although it can be a bit annoying for the
2651 user. However, it totally screws up our testsuite.
2653 So for now, keep adjusting the address of the first N_SLINE
2654 stab, but only for code compiled with GCC. */
2656 if (within_function && sline_found_in_function == 0)
2658 CORE_ADDR addr = processing_gcc_compilation == 2 ?
2659 last_function_start : valu;
2661 record_line (get_current_subfile (), desc,
2662 gdbarch_addr_bits_remove (gdbarch, addr));
2663 sline_found_in_function = 1;
2666 record_line (get_current_subfile (), desc,
2667 gdbarch_addr_bits_remove (gdbarch, valu));
2671 common_block_start (name, objfile);
2675 common_block_end (objfile);
2678 /* The following symbol types need to have the appropriate
2679 offset added to their value; then we process symbol
2680 definitions in the name. */
2682 case N_STSYM: /* Static symbol in data segment. */
2683 case N_LCSYM: /* Static symbol in BSS segment. */
2684 case N_ROSYM: /* Static symbol in read-only data segment. */
2685 /* HORRID HACK DEPT. However, it's Sun's furgin' fault.
2686 Solaris 2's stabs-in-elf makes *most* symbols relative but
2687 leaves a few absolute (at least for Solaris 2.1 and version
2688 2.0.1 of the SunPRO compiler). N_STSYM and friends sit on
2689 the fence. .stab "foo:S...",N_STSYM is absolute (ld
2690 relocates it) .stab "foo:V...",N_STSYM is relative (section
2691 base subtracted). This leaves us no choice but to search for
2692 the 'S' or 'V'... (or pass the whole section_offsets stuff
2693 down ONE MORE function call level, which we really don't want
2698 /* Normal object file and NLMs have non-zero text seg offsets,
2699 but don't need their static syms offset in this fashion.
2700 XXX - This is really a crock that should be fixed in the
2701 solib handling code so that I don't have to work around it
2704 if (!symfile_relocatable)
2706 p = strchr (name, ':');
2707 if (p != 0 && p[1] == 'S')
2709 /* The linker relocated it. We don't want to add a
2710 Sun-stabs Tfoo.foo-like offset, but we *do*
2711 want to add whatever solib.c passed to
2712 symbol_file_add as addr (this is known to affect
2713 SunOS 4, and I suspect ELF too). Since there is no
2714 Ttext.text symbol, we can get addr from the text offset. */
2715 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2716 goto define_a_symbol;
2719 /* Since it's not the kludge case, re-dispatch to the right
2730 internal_error (__FILE__, __LINE__,
2731 _("failed internal consistency check"));
2735 case_N_STSYM: /* Static symbol in data segment. */
2736 case N_DSLINE: /* Source line number, data segment. */
2737 valu += ANOFFSET (section_offsets, SECT_OFF_DATA (objfile));
2738 goto define_a_symbol;
2740 case_N_LCSYM: /* Static symbol in BSS segment. */
2741 case N_BSLINE: /* Source line number, BSS segment. */
2742 /* N_BROWS: overlaps with N_BSLINE. */
2743 valu += ANOFFSET (section_offsets, SECT_OFF_BSS (objfile));
2744 goto define_a_symbol;
2746 case_N_ROSYM: /* Static symbol in read-only data segment. */
2747 valu += ANOFFSET (section_offsets, SECT_OFF_RODATA (objfile));
2748 goto define_a_symbol;
2750 case N_ENTRY: /* Alternate entry point. */
2751 /* Relocate for dynamic loading. */
2752 valu += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
2753 goto define_a_symbol;
2755 /* The following symbol types we don't know how to process.
2756 Handle them in a "default" way, but complain to people who
2759 case N_CATCH: /* Exception handler catcher. */
2760 case N_EHDECL: /* Exception handler name. */
2761 case N_PC: /* Global symbol in Pascal. */
2762 case N_M2C: /* Modula-2 compilation unit. */
2763 /* N_MOD2: overlaps with N_EHDECL. */
2764 case N_SCOPE: /* Modula-2 scope information. */
2765 case N_ECOML: /* End common (local name). */
2766 case N_NBTEXT: /* Gould Non-Base-Register symbols??? */
2771 unknown_symtype_complaint (hex_string (type));
2775 /* These symbol types don't need the address field relocated,
2776 since it is either unused, or is absolute. */
2777 case N_GSYM: /* Global variable. */
2778 case N_NSYMS: /* Number of symbols (Ultrix). */
2779 case N_NOMAP: /* No map? (Ultrix). */
2780 case N_RSYM: /* Register variable. */
2781 case N_DEFD: /* Modula-2 GNU module dependency. */
2782 case N_SSYM: /* Struct or union element. */
2783 case N_LSYM: /* Local symbol in stack. */
2784 case N_PSYM: /* Parameter variable. */
2785 case N_LENG: /* Length of preceding symbol type. */
2789 const char *colon_pos = strchr (name, ':');
2791 if (colon_pos == NULL)
2794 deftype = colon_pos[1];
2800 /* Deal with the SunPRO 3.0 compiler which omits the
2801 address from N_FUN symbols. */
2803 && valu == ANOFFSET (section_offsets,
2804 SECT_OFF_TEXT (objfile))
2805 && gdbarch_sofun_address_maybe_missing (gdbarch))
2807 struct bound_minimal_symbol minsym
2808 = find_stab_function (name, get_last_source_file (),
2810 if (minsym.minsym != NULL)
2811 valu = BMSYMBOL_VALUE_ADDRESS (minsym);
2814 /* These addresses are absolute. */
2815 function_start_offset = valu;
2817 within_function = 1;
2819 if (get_context_stack_depth () > 1)
2821 complaint (_("unmatched N_LBRAC before symtab pos %d"),
2826 if (!outermost_context_p ())
2828 struct block *block;
2830 cstk = pop_context ();
2831 /* Make a block for the local symbols within. */
2832 block = finish_block (cstk.name,
2833 cstk.old_blocks, NULL,
2834 cstk.start_addr, valu);
2836 /* For C++, set the block's scope. */
2837 if (SYMBOL_LANGUAGE (cstk.name) == language_cplus)
2838 cp_set_block_scope (cstk.name, block,
2839 &objfile->objfile_obstack);
2842 newobj = push_context (0, valu);
2843 newobj->name = define_symbol (valu, name, desc, type, objfile);
2847 define_symbol (valu, name, desc, type, objfile);
2853 /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it
2854 for a bunch of other flags, too. Someday we may parse their
2855 flags; for now we ignore theirs and hope they'll ignore ours. */
2856 case N_OPT: /* Solaris 2: Compiler options. */
2859 if (strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0)
2861 processing_gcc_compilation = 2;
2868 case N_MAIN: /* Name of main routine. */
2869 /* FIXME: If one has a symbol file with N_MAIN and then replaces
2870 it with a symbol file with "main" and without N_MAIN. I'm
2871 not sure exactly what rule to follow but probably something
2872 like: N_MAIN takes precedence over "main" no matter what
2873 objfile it is in; If there is more than one N_MAIN, choose
2874 the one in the symfile_objfile; If there is more than one
2875 N_MAIN within a given objfile, complain() and choose
2876 arbitrarily. (kingdon) */
2878 set_objfile_main_name (objfile, name, language_unknown);
2881 /* The following symbol types can be ignored. */
2882 case N_OBJ: /* Solaris 2: Object file dir and name. */
2883 case N_PATCH: /* Solaris 2: Patch Run Time Checker. */
2884 /* N_UNDF: Solaris 2: File separator mark. */
2885 /* N_UNDF: -- we will never encounter it, since we only process
2886 one file's symbols at once. */
2887 case N_ENDM: /* Solaris 2: End of module. */
2888 case N_ALIAS: /* SunPro F77: alias name, ignore for now. */
2892 /* '#' is a GNU C extension to allow one symbol to refer to another
2895 Generally this is used so that an alias can refer to its main
2900 /* Initialize symbol reference names and determine if this is a
2901 definition. If a symbol reference is being defined, go ahead
2902 and add it. Otherwise, just return. */
2904 const char *s = name;
2907 /* If this stab defines a new reference ID that is not on the
2908 reference list, then put it on the reference list.
2910 We go ahead and advance NAME past the reference, even though
2911 it is not strictly necessary at this time. */
2912 refnum = symbol_reference_defined (&s);
2914 if (!ref_search (refnum))
2915 ref_add (refnum, 0, name, valu);
2919 previous_stab_code = type;
2922 /* FIXME: The only difference between this and elfstab_build_psymtabs
2923 is the call to install_minimal_symbols for elf, and the support for
2924 split sections. If the differences are really that small, the code
2925 should be shared. */
2927 /* Scan and build partial symbols for an coff symbol file.
2928 The coff file has already been processed to get its minimal symbols.
2930 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
2933 OBJFILE is the object file we are reading symbols from.
2934 ADDR is the address relative to which the symbols are (e.g.
2935 the base address of the text segment).
2936 TEXTADDR is the address of the text section.
2937 TEXTSIZE is the size of the text section.
2938 STABSECTS is the list of .stab sections in OBJFILE.
2939 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
2940 .stabstr section exists.
2942 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
2943 adjusted for coff details. */
2946 coffstab_build_psymtabs (struct objfile *objfile,
2947 CORE_ADDR textaddr, unsigned int textsize,
2948 struct stab_section_list *stabsects,
2949 file_ptr stabstroffset, unsigned int stabstrsize)
2952 bfd *sym_bfd = objfile->obfd;
2953 char *name = bfd_get_filename (sym_bfd);
2954 unsigned int stabsize;
2956 DBX_TEXT_ADDR (objfile) = textaddr;
2957 DBX_TEXT_SIZE (objfile) = textsize;
2959 #define COFF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */
2960 DBX_SYMBOL_SIZE (objfile) = COFF_STABS_SYMBOL_SIZE;
2961 DBX_STRINGTAB_SIZE (objfile) = stabstrsize;
2963 if (stabstrsize > bfd_get_size (sym_bfd))
2964 error (_("ridiculous string table size: %d bytes"), stabstrsize);
2965 DBX_STRINGTAB (objfile) = (char *)
2966 obstack_alloc (&objfile->objfile_obstack, stabstrsize + 1);
2967 OBJSTAT (objfile, sz_strtab += stabstrsize + 1);
2969 /* Now read in the string table in one big gulp. */
2971 val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET);
2973 perror_with_name (name);
2974 val = bfd_bread (DBX_STRINGTAB (objfile), stabstrsize, sym_bfd);
2975 if (val != stabstrsize)
2976 perror_with_name (name);
2978 stabsread_new_init ();
2979 free_header_files ();
2980 init_header_files ();
2982 processing_acc_compilation = 1;
2984 /* In a coff file, we've already installed the minimal symbols that came
2985 from the coff (non-stab) symbol table, so always act like an
2986 incremental load here. */
2987 if (stabsects->next == NULL)
2989 stabsize = bfd_section_size (sym_bfd, stabsects->section);
2990 DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile);
2991 DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos;
2995 struct stab_section_list *stabsect;
2997 DBX_SYMCOUNT (objfile) = 0;
2998 for (stabsect = stabsects; stabsect != NULL; stabsect = stabsect->next)
3000 stabsize = bfd_section_size (sym_bfd, stabsect->section);
3001 DBX_SYMCOUNT (objfile) += stabsize / DBX_SYMBOL_SIZE (objfile);
3004 DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos;
3006 symbuf_sections = stabsects->next;
3007 symbuf_left = bfd_section_size (sym_bfd, stabsects->section);
3011 dbx_symfile_read (objfile, 0);
3014 /* Scan and build partial symbols for an ELF symbol file.
3015 This ELF file has already been processed to get its minimal symbols.
3017 This routine is the equivalent of dbx_symfile_init and dbx_symfile_read
3020 OBJFILE is the object file we are reading symbols from.
3021 ADDR is the address relative to which the symbols are (e.g.
3022 the base address of the text segment).
3023 STABSECT is the BFD section information for the .stab section.
3024 STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the
3025 .stabstr section exists.
3027 This routine is mostly copied from dbx_symfile_init and dbx_symfile_read,
3028 adjusted for elf details. */
3031 elfstab_build_psymtabs (struct objfile *objfile, asection *stabsect,
3032 file_ptr stabstroffset, unsigned int stabstrsize)
3035 bfd *sym_bfd = objfile->obfd;
3036 char *name = bfd_get_filename (sym_bfd);
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;
3116 struct dbx_symfile_info *dbx;
3118 stabsect = bfd_get_section_by_name (sym_bfd, stab_name);
3119 stabstrsect = bfd_get_section_by_name (sym_bfd, stabstr_name);
3125 error (_("stabsect_build_psymtabs: Found stabs (%s), "
3126 "but not string section (%s)"),
3127 stab_name, stabstr_name);
3129 dbx = XCNEW (struct dbx_symfile_info);
3130 set_objfile_data (objfile, dbx_objfile_data_key, dbx);
3132 text_sect = bfd_get_section_by_name (sym_bfd, text_name);
3134 error (_("Can't find %s section in symbol file"), text_name);
3135 DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect);
3136 DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect);
3138 DBX_SYMBOL_SIZE (objfile) = sizeof (struct external_nlist);
3139 DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect)
3140 / DBX_SYMBOL_SIZE (objfile);
3141 DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stabstrsect);
3142 DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; /* XXX - FIXME: POKING
3146 if (DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
3147 error (_("ridiculous string table size: %d bytes"),
3148 DBX_STRINGTAB_SIZE (objfile));
3149 DBX_STRINGTAB (objfile) = (char *)
3150 obstack_alloc (&objfile->objfile_obstack,
3151 DBX_STRINGTAB_SIZE (objfile) + 1);
3152 OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile) + 1);
3154 /* Now read in the string table in one big gulp. */
3156 val = bfd_get_section_contents (sym_bfd, /* bfd */
3157 stabstrsect, /* bfd section */
3158 DBX_STRINGTAB (objfile), /* input buffer */
3159 0, /* offset into section */
3160 DBX_STRINGTAB_SIZE (objfile)); /* amount to
3164 perror_with_name (name);
3166 stabsread_new_init ();
3167 free_header_files ();
3168 init_header_files ();
3170 /* Now, do an incremental load. */
3172 processing_acc_compilation = 1;
3173 dbx_symfile_read (objfile, 0);
3176 static const struct sym_fns aout_sym_fns =
3178 dbx_new_init, /* init anything gbl to entire symtab */
3179 dbx_symfile_init, /* read initial info, setup for sym_read() */
3180 dbx_symfile_read, /* read a symbol file into symtab */
3181 NULL, /* sym_read_psymbols */
3182 dbx_symfile_finish, /* finished with file, cleanup */
3183 default_symfile_offsets, /* parse user's offsets to internal form */
3184 default_symfile_segments, /* Get segment information from a file. */
3186 default_symfile_relocate, /* Relocate a debug section. */
3187 NULL, /* sym_probe_fns */
3192 _initialize_dbxread (void)
3194 add_symtab_fns (bfd_target_aout_flavour, &aout_sym_fns);
3196 dbx_objfile_data_key
3197 = register_objfile_data_with_cleanup (NULL, dbx_free_symfile_info);