1 /* Read coff symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1987-2022 Free Software Foundation, Inc.
3 Contributed by David D. Johnson, Brown University (ddj@cs.brown.edu).
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "breakpoint.h"
27 #include "gdbsupport/gdb_obstack.h"
30 #include "coff/internal.h" /* Internal format of COFF symbols in BFD */
31 #include "libcoff.h" /* FIXME secret internal data from BFD */
33 #include "buildsym-legacy.h"
34 #include "stabsread.h"
35 #include "complaints.h"
38 #include "dictionary.h"
39 #include "dwarf2/public.h"
41 #include "coff-pe-read.h"
46 /* The objfile we are currently reading. */
48 static struct objfile
*coffread_objfile
;
50 struct coff_symfile_info
52 file_ptr min_lineno_offset
= 0; /* Where in file lowest line#s are. */
53 file_ptr max_lineno_offset
= 0; /* 1+last byte of line#s in file. */
55 CORE_ADDR textaddr
= 0; /* Addr of .text section. */
56 unsigned int textsize
= 0; /* Size of .text section. */
57 std::vector
<asection
*> *stabsects
; /* .stab sections. */
58 asection
*stabstrsect
= nullptr; /* Section pointer for .stab section. */
59 char *stabstrdata
= nullptr;
62 /* Key for COFF-associated data. */
64 static const struct objfile_key
<coff_symfile_info
> coff_objfile_data_key
;
66 /* Translate an external name string into a user-visible name. */
67 #define EXTERNAL_NAME(string, abfd) \
68 (string[0] == bfd_get_symbol_leading_char (abfd) \
69 ? string + 1 : string)
71 /* To be an sdb debug type, type must have at least a basic or primary
72 derived type. Using this rather than checking against T_NULL is
73 said to prevent core dumps if we try to operate on Michael Bloom
76 #define SDB_TYPE(type) (BTYPE(type) | (type & N_TMASK))
78 /* Core address of start and end of text of current source file.
79 This comes from a ".text" symbol where x_nlinno > 0. */
81 static CORE_ADDR current_source_start_addr
;
82 static CORE_ADDR current_source_end_addr
;
84 /* The addresses of the symbol table stream and number of symbols
85 of the object file we are reading (as copied into core). */
87 static bfd
*nlist_bfd_global
;
88 static int nlist_nsyms_global
;
91 /* Pointers to scratch storage, used for reading raw symbols and
94 static char *temp_sym
;
95 static char *temp_aux
;
97 /* Local variables that hold the shift and mask values for the
98 COFF file that we are currently reading. These come back to us
99 from BFD, and are referenced by their macro names, as well as
100 internally to the BTYPE, ISPTR, ISFCN, ISARY, ISTAG, and DECREF
101 macros from include/coff/internal.h . */
103 static unsigned local_n_btmask
;
104 static unsigned local_n_btshft
;
105 static unsigned local_n_tmask
;
106 static unsigned local_n_tshift
;
108 #define N_BTMASK local_n_btmask
109 #define N_BTSHFT local_n_btshft
110 #define N_TMASK local_n_tmask
111 #define N_TSHIFT local_n_tshift
113 /* Local variables that hold the sizes in the file of various COFF
114 structures. (We only need to know this to read them from the file
115 -- BFD will then translate the data in them, into `internal_xxx'
116 structs in the right byte order, alignment, etc.) */
118 static unsigned local_linesz
;
119 static unsigned local_symesz
;
120 static unsigned local_auxesz
;
122 /* This is set if this is a PE format file. */
126 /* Chain of typedefs of pointers to empty struct/union types.
127 They are chained thru the SYMBOL_VALUE_CHAIN. */
129 static struct symbol
*opaque_type_chain
[HASHSIZE
];
131 /* Simplified internal version of coff symbol table information. */
136 int c_symnum
; /* Symbol number of this entry. */
137 int c_naux
; /* 0 if syment only, 1 if syment +
145 /* Vector of types defined so far, indexed by their type numbers. */
147 static struct type
**type_vector
;
149 /* Number of elements allocated for type_vector currently. */
151 static int type_vector_length
;
153 /* Initial size of type vector. Is realloc'd larger if needed, and
154 realloc'd down to the size actually used, when completed. */
156 #define INITIAL_TYPE_VECTOR_LENGTH 160
158 static char *linetab
= NULL
;
159 static file_ptr linetab_offset
;
160 static file_ptr linetab_size
;
162 static char *stringtab
= NULL
;
164 extern void stabsread_clear_cache (void);
166 static struct type
*coff_read_struct_type (int, int, int,
169 static struct type
*decode_base_type (struct coff_symbol
*,
171 union internal_auxent
*,
174 static struct type
*decode_type (struct coff_symbol
*, unsigned int,
175 union internal_auxent
*,
178 static struct type
*decode_function_type (struct coff_symbol
*,
180 union internal_auxent
*,
183 static struct type
*coff_read_enum_type (int, int, int,
186 static struct symbol
*process_coff_symbol (struct coff_symbol
*,
187 union internal_auxent
*,
190 static void patch_opaque_types (struct symtab
*);
192 static void enter_linenos (file_ptr
, int, int, struct objfile
*);
194 static int init_lineno (bfd
*, file_ptr
, file_ptr
, gdb::unique_xmalloc_ptr
<char> *);
196 static char *getsymname (struct internal_syment
*);
198 static const char *coff_getfilename (union internal_auxent
*);
200 static int init_stringtab (bfd
*, file_ptr
, gdb::unique_xmalloc_ptr
<char> *);
202 static void read_one_sym (struct coff_symbol
*,
203 struct internal_syment
*,
204 union internal_auxent
*);
206 static void coff_symtab_read (minimal_symbol_reader
&,
207 file_ptr
, unsigned int, struct objfile
*);
209 /* We are called once per section from coff_symfile_read. We
210 need to examine each section we are passed, check to see
211 if it is something we are interested in processing, and
212 if so, stash away some access information for the section.
214 FIXME: The section names should not be hardwired strings (what
215 should they be? I don't think most object file formats have enough
216 section flags to specify what kind of debug section it is
220 coff_locate_sections (bfd
*abfd
, asection
*sectp
, void *csip
)
222 struct coff_symfile_info
*csi
;
225 csi
= (struct coff_symfile_info
*) csip
;
226 name
= bfd_section_name (sectp
);
227 if (strcmp (name
, ".text") == 0)
229 csi
->textaddr
= bfd_section_vma (sectp
);
230 csi
->textsize
+= bfd_section_size (sectp
);
232 else if (startswith (name
, ".text"))
234 csi
->textsize
+= bfd_section_size (sectp
);
236 else if (strcmp (name
, ".stabstr") == 0)
238 csi
->stabstrsect
= sectp
;
240 else if (startswith (name
, ".stab"))
244 /* We can have multiple .stab sections if linked with
246 for (s
= name
+ sizeof ".stab" - 1; *s
!= '\0'; s
++)
250 csi
->stabsects
->push_back (sectp
);
254 /* Return the section_offsets* that CS points to. */
255 static int cs_to_section (struct coff_symbol
*, struct objfile
*);
257 struct find_targ_sec_arg
264 find_targ_sec (bfd
*abfd
, asection
*sect
, void *obj
)
266 struct find_targ_sec_arg
*args
= (struct find_targ_sec_arg
*) obj
;
268 if (sect
->target_index
== args
->targ_index
)
269 *args
->resultp
= sect
;
272 /* Return the bfd_section that CS points to. */
273 static struct bfd_section
*
274 cs_to_bfd_section (struct coff_symbol
*cs
, struct objfile
*objfile
)
276 asection
*sect
= NULL
;
277 struct find_targ_sec_arg args
;
279 args
.targ_index
= cs
->c_secnum
;
280 args
.resultp
= §
;
281 bfd_map_over_sections (objfile
->obfd
, find_targ_sec
, &args
);
285 /* Return the section number (SECT_OFF_*) that CS points to. */
287 cs_to_section (struct coff_symbol
*cs
, struct objfile
*objfile
)
289 asection
*sect
= cs_to_bfd_section (cs
, objfile
);
292 return SECT_OFF_TEXT (objfile
);
293 return gdb_bfd_section_index (objfile
->obfd
, sect
);
296 /* Return the address of the section of a COFF symbol. */
298 static CORE_ADDR
cs_section_address (struct coff_symbol
*, bfd
*);
301 cs_section_address (struct coff_symbol
*cs
, bfd
*abfd
)
303 asection
*sect
= NULL
;
304 struct find_targ_sec_arg args
;
307 args
.targ_index
= cs
->c_secnum
;
308 args
.resultp
= §
;
309 bfd_map_over_sections (abfd
, find_targ_sec
, &args
);
311 addr
= bfd_section_vma (sect
);
315 /* Look up a coff type-number index. Return the address of the slot
316 where the type for that index is stored.
317 The type-number is in INDEX.
319 This can be used for finding the type associated with that index
320 or for associating a new type with the index. */
322 static struct type
**
323 coff_lookup_type (int index
)
325 if (index
>= type_vector_length
)
327 int old_vector_length
= type_vector_length
;
329 type_vector_length
*= 2;
330 if (index
/* is still */ >= type_vector_length
)
331 type_vector_length
= index
* 2;
333 type_vector
= (struct type
**)
334 xrealloc ((char *) type_vector
,
335 type_vector_length
* sizeof (struct type
*));
336 memset (&type_vector
[old_vector_length
], 0,
337 (type_vector_length
- old_vector_length
) * sizeof (struct type
*));
339 return &type_vector
[index
];
342 /* Make sure there is a type allocated for type number index
343 and return the type object.
344 This can create an empty (zeroed) type object. */
347 coff_alloc_type (int index
)
349 struct type
**type_addr
= coff_lookup_type (index
);
350 struct type
*type
= *type_addr
;
352 /* If we are referring to a type not known at all yet,
353 allocate an empty type for it.
354 We will fill it in later if we find out how. */
357 type
= alloc_type (coffread_objfile
);
363 /* Start a new symtab for a new source file.
364 This is called when a COFF ".file" symbol is seen;
365 it indicates the start of data for one original source file. */
368 coff_start_compunit_symtab (struct objfile
*objfile
, const char *name
)
371 start_compunit_symtab (objfile
,
373 /* We never know the directory name for COFF. */
375 /* The start address is irrelevant, since we call
376 set_last_source_start_addr in coff_end_compunit_symtab. */
378 /* Let buildsym.c deduce the language for this symtab. */
380 record_debugformat ("COFF");
383 /* Save the vital information from when starting to read a file,
384 for use when closing off the current file.
385 NAME is the file name the symbols came from, START_ADDR is the
386 first text address for the file, and SIZE is the number of bytes of
390 complete_symtab (const char *name
, CORE_ADDR start_addr
, unsigned int size
)
392 set_last_source_file (name
);
393 current_source_start_addr
= start_addr
;
394 current_source_end_addr
= start_addr
+ size
;
397 /* Finish the symbol definitions for one main source file, close off
398 all the lexical contexts for that file (creating struct block's for
399 them), then make the struct symtab for that file and put it in the
403 coff_end_compunit_symtab (struct objfile
*objfile
)
405 set_last_source_start_addr (current_source_start_addr
);
407 end_compunit_symtab (current_source_end_addr
, SECT_OFF_TEXT (objfile
));
409 /* Reinitialize for beginning of new file. */
410 set_last_source_file (NULL
);
413 /* The linker sometimes generates some non-function symbols inside
414 functions referencing variables imported from another DLL.
415 Return nonzero if the given symbol corresponds to one of them. */
418 is_import_fixup_symbol (struct coff_symbol
*cs
,
419 enum minimal_symbol_type type
)
421 /* The following is a bit of a heuristic using the characteristics
422 of these fixup symbols, but should work well in practice... */
425 /* Must be a non-static text symbol. */
426 if (type
!= mst_text
)
429 /* Must be a non-function symbol. */
430 if (ISFCN (cs
->c_type
))
433 /* The name must start with "__fu<digits>__". */
434 if (!startswith (cs
->c_name
, "__fu"))
436 if (! isdigit (cs
->c_name
[4]))
438 for (i
= 5; cs
->c_name
[i
] != '\0' && isdigit (cs
->c_name
[i
]); i
++)
439 /* Nothing, just incrementing index past all digits. */;
440 if (cs
->c_name
[i
] != '_' || cs
->c_name
[i
+ 1] != '_')
446 static struct minimal_symbol
*
447 record_minimal_symbol (minimal_symbol_reader
&reader
,
448 struct coff_symbol
*cs
, CORE_ADDR address
,
449 enum minimal_symbol_type type
, int section
,
450 struct objfile
*objfile
)
452 /* We don't want TDESC entry points in the minimal symbol table. */
453 if (cs
->c_name
[0] == '@')
456 if (is_import_fixup_symbol (cs
, type
))
458 /* Because the value of these symbols is within a function code
459 range, these symbols interfere with the symbol-from-address
460 reverse lookup; this manifests itself in backtraces, or any
461 other commands that prints symbolic addresses. Just pretend
462 these symbols do not exist. */
466 return reader
.record_full (cs
->c_name
, true, address
, type
, section
);
469 /* coff_symfile_init ()
470 is the coff-specific initialization routine for reading symbols.
471 It is passed a struct objfile which contains, among other things,
472 the BFD for the file whose symbols are being read, and a slot for
473 a pointer to "private data" which we fill with cookies and other
474 treats for coff_symfile_read ().
476 We will only be called if this is a COFF or COFF-like file. BFD
477 handles figuring out the format of the file, and code in symtab.c
478 uses BFD's determination to vector to us.
480 The ultimate result is a new symtab (or, FIXME, eventually a
484 coff_symfile_init (struct objfile
*objfile
)
486 /* Allocate struct to keep track of the symfile. */
487 coff_objfile_data_key
.emplace (objfile
);
489 /* COFF objects may be reordered, so set OBJF_REORDERED. If we
490 find this causes a significant slowdown in gdb then we could
491 set it in the debug symbol readers only when necessary. */
492 objfile
->flags
|= OBJF_REORDERED
;
495 /* This function is called for every section; it finds the outer
496 limits of the line table (minimum and maximum file offset) so that
497 the mainline code can read the whole thing for efficiency. */
500 find_linenos (bfd
*abfd
, struct bfd_section
*asect
, void *vpinfo
)
502 struct coff_symfile_info
*info
;
504 file_ptr offset
, maxoff
;
506 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
507 count
= asect
->lineno_count
;
508 /* End of warning. */
512 size
= count
* local_linesz
;
514 info
= (struct coff_symfile_info
*) vpinfo
;
515 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
516 offset
= asect
->line_filepos
;
517 /* End of warning. */
519 if (offset
< info
->min_lineno_offset
|| info
->min_lineno_offset
== 0)
520 info
->min_lineno_offset
= offset
;
522 maxoff
= offset
+ size
;
523 if (maxoff
> info
->max_lineno_offset
)
524 info
->max_lineno_offset
= maxoff
;
528 /* The BFD for this file -- only good while we're actively reading
529 symbols into a psymtab or a symtab. */
531 static bfd
*symfile_bfd
;
533 /* Read a symbol file, after initialization by coff_symfile_init. */
536 coff_symfile_read (struct objfile
*objfile
, symfile_add_flags symfile_flags
)
538 struct coff_symfile_info
*info
;
539 bfd
*abfd
= objfile
->obfd
;
540 coff_data_type
*cdata
= coff_data (abfd
);
541 const char *filename
= bfd_get_filename (abfd
);
543 unsigned int num_symbols
;
544 file_ptr symtab_offset
;
545 file_ptr stringtab_offset
;
546 unsigned int stabstrsize
;
548 info
= coff_objfile_data_key
.get (objfile
);
549 symfile_bfd
= abfd
; /* Kludge for swap routines. */
551 std::vector
<asection
*> stabsects
;
552 scoped_restore restore_stabsects
553 = make_scoped_restore (&info
->stabsects
, &stabsects
);
555 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
556 num_symbols
= bfd_get_symcount (abfd
); /* How many syms */
557 symtab_offset
= cdata
->sym_filepos
; /* Symbol table file offset */
558 stringtab_offset
= symtab_offset
+ /* String table file offset */
559 num_symbols
* cdata
->local_symesz
;
561 /* Set a few file-statics that give us specific information about
562 the particular COFF file format we're reading. */
563 local_n_btmask
= cdata
->local_n_btmask
;
564 local_n_btshft
= cdata
->local_n_btshft
;
565 local_n_tmask
= cdata
->local_n_tmask
;
566 local_n_tshift
= cdata
->local_n_tshift
;
567 local_linesz
= cdata
->local_linesz
;
568 local_symesz
= cdata
->local_symesz
;
569 local_auxesz
= cdata
->local_auxesz
;
571 /* Allocate space for raw symbol and aux entries, based on their
572 space requirements as reported by BFD. */
573 gdb::def_vector
<char> temp_storage (cdata
->local_symesz
574 + cdata
->local_auxesz
);
575 temp_sym
= temp_storage
.data ();
576 temp_aux
= temp_sym
+ cdata
->local_symesz
;
578 /* We need to know whether this is a PE file, because in PE files,
579 unlike standard COFF files, symbol values are stored as offsets
580 from the section address, rather than as absolute addresses.
581 FIXME: We should use BFD to read the symbol table, and thus avoid
584 startswith (bfd_get_target (objfile
->obfd
), "pe")
585 || startswith (bfd_get_target (objfile
->obfd
), "epoc-pe");
587 /* End of warning. */
589 info
->min_lineno_offset
= 0;
590 info
->max_lineno_offset
= 0;
592 /* Only read line number information if we have symbols.
594 On Windows NT, some of the system's DLL's have sections with
595 PointerToLinenumbers fields that are non-zero, but point at
596 random places within the image file. (In the case I found,
597 KERNEL32.DLL's .text section has a line number info pointer that
598 points into the middle of the string `lib\\i386\kernel32.dll'.)
600 However, these DLL's also have no symbols. The line number
601 tables are meaningless without symbols. And in fact, GDB never
602 uses the line number information unless there are symbols. So we
603 can avoid spurious error messages (and maybe run a little
604 faster!) by not even reading the line number table unless we have
606 scoped_restore restore_linetab
= make_scoped_restore (&linetab
);
607 gdb::unique_xmalloc_ptr
<char> linetab_storage
;
610 /* Read the line number table, all at once. */
611 bfd_map_over_sections (abfd
, find_linenos
, (void *) info
);
613 val
= init_lineno (abfd
, info
->min_lineno_offset
,
614 info
->max_lineno_offset
- info
->min_lineno_offset
,
617 error (_("\"%s\": error reading line numbers."), filename
);
620 /* Now read the string table, all at once. */
622 scoped_restore restore_stringtab
= make_scoped_restore (&stringtab
);
623 gdb::unique_xmalloc_ptr
<char> stringtab_storage
;
624 val
= init_stringtab (abfd
, stringtab_offset
, &stringtab_storage
);
626 error (_("\"%s\": can't get string table"), filename
);
628 minimal_symbol_reader
reader (objfile
);
630 /* Now that the executable file is positioned at symbol table,
631 process it and define symbols accordingly. */
633 coff_symtab_read (reader
, (long) symtab_offset
, num_symbols
, objfile
);
635 /* Install any minimal symbols that have been collected as the
636 current minimal symbols for this objfile. */
642 for (minimal_symbol
*msym
: objfile
->msymbols ())
644 const char *name
= msym
->linkage_name ();
646 /* If the minimal symbols whose name are prefixed by "__imp_"
647 or "_imp_", get rid of the prefix, and search the minimal
648 symbol in OBJFILE. Note that 'maintenance print msymbols'
649 shows that type of these "_imp_XXXX" symbols is mst_data. */
650 if (msym
->type () == mst_data
)
652 const char *name1
= NULL
;
654 if (startswith (name
, "_imp_"))
656 else if (startswith (name
, "__imp_"))
660 int lead
= bfd_get_symbol_leading_char (objfile
->obfd
);
661 struct bound_minimal_symbol found
;
663 if (lead
!= '\0' && *name1
== lead
)
666 found
= lookup_minimal_symbol (name1
, NULL
, objfile
);
668 /* If found, there are symbols named "_imp_foo" and "foo"
669 respectively in OBJFILE. Set the type of symbol "foo"
670 as 'mst_solib_trampoline'. */
671 if (found
.minsym
!= NULL
672 && found
.minsym
->type () == mst_text
)
673 found
.minsym
->set_type (mst_solib_trampoline
);
679 if (!(objfile
->flags
& OBJF_READNEVER
))
680 bfd_map_over_sections (abfd
, coff_locate_sections
, (void *) info
);
682 if (!info
->stabsects
->empty())
684 if (!info
->stabstrsect
)
686 error (_("The debugging information in `%s' is corrupted.\nThe "
687 "file has a `.stabs' section, but no `.stabstr' section."),
691 /* FIXME: dubious. Why can't we use something normal like
692 bfd_get_section_contents? */
693 bfd_seek (abfd
, abfd
->where
, 0);
695 stabstrsize
= bfd_section_size (info
->stabstrsect
);
697 coffstab_build_psymtabs (objfile
,
698 info
->textaddr
, info
->textsize
,
700 info
->stabstrsect
->filepos
, stabstrsize
);
702 if (dwarf2_has_info (objfile
, NULL
))
704 /* DWARF2 sections. */
705 dwarf2_initialize_objfile (objfile
);
708 /* Try to add separate debug file if no symbols table found. */
709 if (!objfile
->has_partial_symbols ())
711 std::string debugfile
= find_separate_debug_file_by_buildid (objfile
);
713 if (debugfile
.empty ())
714 debugfile
= find_separate_debug_file_by_debuglink (objfile
);
716 if (!debugfile
.empty ())
718 gdb_bfd_ref_ptr
debug_bfd (symfile_bfd_open (debugfile
.c_str ()));
720 symbol_file_add_separate (debug_bfd
.get (), debugfile
.c_str (),
721 symfile_flags
, objfile
);
727 coff_new_init (struct objfile
*ignore
)
731 /* Perform any local cleanups required when we are done with a
732 particular objfile. I.E, we are in the process of discarding all
733 symbol information for an objfile, freeing up all memory held for
734 it, and unlinking the objfile struct from the global list of known
738 coff_symfile_finish (struct objfile
*objfile
)
740 /* Let stabs reader clean up. */
741 stabsread_clear_cache ();
745 /* Given pointers to a symbol table in coff style exec file,
746 analyze them and create struct symtab's describing the symbols.
747 NSYMS is the number of symbols in the symbol table.
748 We read them one at a time using read_one_sym (). */
751 coff_symtab_read (minimal_symbol_reader
&reader
,
752 file_ptr symtab_offset
, unsigned int nsyms
,
753 struct objfile
*objfile
)
755 struct gdbarch
*gdbarch
= objfile
->arch ();
756 struct context_stack
*newobj
= nullptr;
757 struct coff_symbol coff_symbol
;
758 struct coff_symbol
*cs
= &coff_symbol
;
759 static struct internal_syment main_sym
;
760 static union internal_auxent main_aux
;
761 struct coff_symbol fcn_cs_saved
;
762 static struct internal_syment fcn_sym_saved
;
763 static union internal_auxent fcn_aux_saved
;
764 /* A .file is open. */
765 int in_source_file
= 0;
766 int next_file_symnum
= -1;
767 /* Name of the current file. */
768 const char *filestring
= "";
770 int fcn_first_line
= 0;
771 CORE_ADDR fcn_first_line_addr
= 0;
772 int fcn_last_line
= 0;
773 int fcn_start_addr
= 0;
774 long fcn_line_ptr
= 0;
777 struct minimal_symbol
*msym
;
779 scoped_free_pendings free_pending
;
781 /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous....
782 it's hard to know I've really worked around it. The fix should
783 be harmless, anyway). The symptom of the bug is that the first
784 fread (in read_one_sym), will (in my example) actually get data
785 from file offset 268, when the fseek was to 264 (and ftell shows
786 264). This causes all hell to break loose. I was unable to
787 reproduce this on a short test program which operated on the same
788 file, performing (I think) the same sequence of operations.
790 It stopped happening when I put in this (former) rewind().
792 FIXME: Find out if this has been reported to Sun, whether it has
793 been fixed in a later release, etc. */
795 bfd_seek (objfile
->obfd
, 0, 0);
797 /* Position to read the symbol table. */
798 val
= bfd_seek (objfile
->obfd
, symtab_offset
, 0);
800 perror_with_name (objfile_name (objfile
));
802 coffread_objfile
= objfile
;
803 nlist_bfd_global
= objfile
->obfd
;
804 nlist_nsyms_global
= nsyms
;
805 set_last_source_file (NULL
);
806 memset (opaque_type_chain
, 0, sizeof opaque_type_chain
);
808 if (type_vector
) /* Get rid of previous one. */
810 type_vector_length
= INITIAL_TYPE_VECTOR_LENGTH
;
811 type_vector
= XCNEWVEC (struct type
*, type_vector_length
);
813 coff_start_compunit_symtab (objfile
, "");
816 while (symnum
< nsyms
)
818 QUIT
; /* Make this command interruptable. */
820 read_one_sym (cs
, &main_sym
, &main_aux
);
822 if (cs
->c_symnum
== next_file_symnum
&& cs
->c_sclass
!= C_FILE
)
824 if (get_last_source_file ())
825 coff_end_compunit_symtab (objfile
);
827 coff_start_compunit_symtab (objfile
, "_globals_");
828 /* coff_start_compunit_symtab will set the language of this symtab to
829 language_unknown, since such a ``file name'' is not
830 recognized. Override that with the minimal language to
831 allow printing values in this symtab. */
832 get_current_subfile ()->language
= language_minimal
;
833 complete_symtab ("_globals_", 0, 0);
834 /* Done with all files, everything from here on out is
838 /* Special case for file with type declarations only, no
840 if (!get_last_source_file () && SDB_TYPE (cs
->c_type
)
841 && cs
->c_secnum
== N_DEBUG
)
842 complete_symtab (filestring
, 0, 0);
844 /* Typedefs should not be treated as symbol definitions. */
845 if (ISFCN (cs
->c_type
) && cs
->c_sclass
!= C_TPDEF
)
847 /* Record all functions -- external and static -- in
849 int section
= cs_to_section (cs
, objfile
);
851 tmpaddr
= cs
->c_value
;
852 /* Don't record unresolved symbols. */
853 if (!(cs
->c_secnum
<= 0 && cs
->c_value
== 0))
854 record_minimal_symbol (reader
, cs
, tmpaddr
, mst_text
,
857 fcn_line_ptr
= main_aux
.x_sym
.x_fcnary
.x_fcn
.x_lnnoptr
;
858 fcn_start_addr
= tmpaddr
;
860 fcn_sym_saved
= main_sym
;
861 fcn_aux_saved
= main_aux
;
865 switch (cs
->c_sclass
)
874 complaint (_("Bad n_sclass for symbol %s"),
879 /* c_value field contains symnum of next .file entry in
880 table or symnum of first global after last .file. */
881 next_file_symnum
= cs
->c_value
;
883 filestring
= coff_getfilename (&main_aux
);
887 /* Complete symbol table for last object file
888 containing debugging information. */
889 if (get_last_source_file ())
891 coff_end_compunit_symtab (objfile
);
892 coff_start_compunit_symtab (objfile
, filestring
);
897 /* C_LABEL is used for labels and static functions.
898 Including it here allows gdb to see static functions when
899 no debug info is available. */
901 /* However, labels within a function can make weird
902 backtraces, so filter them out (from phdm@macqel.be). */
909 case C_THUMBSTATFUNC
:
910 if (cs
->c_name
[0] == '.')
912 if (strcmp (cs
->c_name
, ".text") == 0)
914 /* FIXME: don't wire in ".text" as section name or
916 /* Check for in_source_file deals with case of a
917 file with debugging symbols followed by a later
918 file with no symbols. */
920 complete_symtab (filestring
,
922 + objfile
->text_section_offset ()),
923 main_aux
.x_scn
.x_scnlen
);
926 /* Flush rest of '.' symbols. */
929 else if (!SDB_TYPE (cs
->c_type
)
930 && cs
->c_name
[0] == 'L'
931 && (startswith (cs
->c_name
, "LI%")
932 || startswith (cs
->c_name
, "LF%")
933 || startswith (cs
->c_name
, "LC%")
934 || startswith (cs
->c_name
, "LP%")
935 || startswith (cs
->c_name
, "LPB%")
936 || startswith (cs
->c_name
, "LBB%")
937 || startswith (cs
->c_name
, "LBE%")
938 || startswith (cs
->c_name
, "LPBX%")))
939 /* At least on a 3b1, gcc generates swbeg and string labels
940 that look like this. Ignore them. */
942 /* For static symbols that don't start with '.'... */
948 /* Record it in the minimal symbols regardless of
949 SDB_TYPE. This parallels what we do for other debug
950 formats, and probably is needed to make
951 print_address_symbolic work right without the (now
952 gone) "set fast-symbolic-addr off" kludge. */
954 enum minimal_symbol_type ms_type
;
956 CORE_ADDR offset
= 0;
958 if (cs
->c_secnum
== N_UNDEF
)
960 /* This is a common symbol. We used to rely on
961 the target to tell us whether it knows where
962 the symbol has been relocated to, but none of
963 the target implementations actually provided
964 that operation. So we just ignore the symbol,
965 the same way we would do if we had a target-side
966 symbol lookup which returned no match. */
969 else if (cs
->c_secnum
== N_ABS
)
971 /* Use the correct minimal symbol type (and don't
972 relocate) for absolute values. */
974 sec
= cs_to_section (cs
, objfile
);
975 tmpaddr
= cs
->c_value
;
979 asection
*bfd_section
= cs_to_bfd_section (cs
, objfile
);
981 sec
= cs_to_section (cs
, objfile
);
982 tmpaddr
= cs
->c_value
;
983 /* Statics in a PE file also get relocated. */
984 if (cs
->c_sclass
== C_EXT
985 || cs
->c_sclass
== C_THUMBEXTFUNC
986 || cs
->c_sclass
== C_THUMBEXT
987 || (pe_file
&& (cs
->c_sclass
== C_STAT
)))
988 offset
= objfile
->section_offsets
[sec
];
990 if (bfd_section
->flags
& SEC_CODE
)
993 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXTFUNC
994 || cs
->c_sclass
== C_THUMBEXT
?
995 mst_text
: mst_file_text
;
996 tmpaddr
= gdbarch_addr_bits_remove (gdbarch
, tmpaddr
);
998 else if (bfd_section
->flags
& SEC_ALLOC
999 && bfd_section
->flags
& SEC_LOAD
)
1002 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1003 ? mst_data
: mst_file_data
;
1005 else if (bfd_section
->flags
& SEC_ALLOC
)
1008 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1009 ? mst_bss
: mst_file_bss
;
1012 ms_type
= mst_unknown
;
1015 msym
= record_minimal_symbol (reader
, cs
, tmpaddr
, ms_type
,
1018 gdbarch_coff_make_msymbol_special (gdbarch
,
1019 cs
->c_sclass
, msym
);
1021 if (SDB_TYPE (cs
->c_type
))
1025 sym
= process_coff_symbol
1026 (cs
, &main_aux
, objfile
);
1027 sym
->set_value_longest (tmpaddr
+ offset
);
1028 sym
->set_section_index (sec
);
1034 if (strcmp (cs
->c_name
, ".bf") == 0)
1036 within_function
= 1;
1038 /* Value contains address of first non-init type
1040 /* main_aux.x_sym.x_misc.x_lnsz.x_lnno
1041 contains line number of '{' }. */
1042 if (cs
->c_naux
!= 1)
1043 complaint (_("`.bf' symbol %d has no aux entry"),
1045 fcn_first_line
= main_aux
.x_sym
.x_misc
.x_lnsz
.x_lnno
;
1046 fcn_first_line_addr
= cs
->c_value
;
1048 /* Might want to check that locals are 0 and
1049 context_stack_depth is zero, and complain if not. */
1052 newobj
= push_context (depth
, fcn_start_addr
);
1053 fcn_cs_saved
.c_name
= getsymname (&fcn_sym_saved
);
1055 process_coff_symbol (&fcn_cs_saved
,
1056 &fcn_aux_saved
, objfile
);
1058 else if (strcmp (cs
->c_name
, ".ef") == 0)
1060 if (!within_function
)
1061 error (_("Bad coff function information."));
1062 /* The value of .ef is the address of epilogue code;
1063 not useful for gdb. */
1064 /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
1065 contains number of lines to '}' */
1067 if (outermost_context_p ())
1068 { /* We attempted to pop an empty context stack. */
1069 complaint (_("`.ef' symbol without matching `.bf' "
1070 "symbol ignored starting at symnum %d"),
1072 within_function
= 0;
1076 struct context_stack cstk
= pop_context ();
1077 /* Stack must be empty now. */
1078 if (!outermost_context_p () || newobj
== NULL
)
1080 complaint (_("Unmatched .ef symbol(s) ignored "
1081 "starting at symnum %d"),
1083 within_function
= 0;
1086 if (cs
->c_naux
!= 1)
1088 complaint (_("`.ef' symbol %d has no aux entry"),
1090 fcn_last_line
= 0x7FFFFFFF;
1094 fcn_last_line
= main_aux
.x_sym
.x_misc
.x_lnsz
.x_lnno
;
1096 /* fcn_first_line is the line number of the opening '{'.
1097 Do not record it - because it would affect gdb's idea
1098 of the line number of the first statement of the
1099 function - except for one-line functions, for which
1100 it is also the line number of all the statements and
1101 of the closing '}', and for which we do not have any
1102 other statement-line-number. */
1103 if (fcn_last_line
== 1)
1104 record_line (get_current_subfile (), fcn_first_line
,
1105 gdbarch_addr_bits_remove (gdbarch
,
1106 fcn_first_line_addr
));
1108 enter_linenos (fcn_line_ptr
, fcn_first_line
,
1109 fcn_last_line
, objfile
);
1111 finish_block (cstk
.name
, cstk
.old_blocks
,
1112 NULL
, cstk
.start_addr
,
1113 fcn_cs_saved
.c_value
1114 + fcn_aux_saved
.x_sym
.x_misc
.x_fsize
1115 + objfile
->text_section_offset ());
1116 within_function
= 0;
1121 if (strcmp (cs
->c_name
, ".bb") == 0)
1123 tmpaddr
= cs
->c_value
;
1124 tmpaddr
+= objfile
->text_section_offset ();
1125 push_context (++depth
, tmpaddr
);
1127 else if (strcmp (cs
->c_name
, ".eb") == 0)
1129 if (outermost_context_p ())
1130 { /* We attempted to pop an empty context stack. */
1131 complaint (_("`.eb' symbol without matching `.bb' "
1132 "symbol ignored starting at symnum %d"),
1137 struct context_stack cstk
= pop_context ();
1138 if (depth
-- != cstk
.depth
)
1140 complaint (_("Mismatched .eb symbol ignored "
1141 "starting at symnum %d"),
1145 if (*get_local_symbols () && !outermost_context_p ())
1147 tmpaddr
= cs
->c_value
+ objfile
->text_section_offset ();
1148 /* Make a block for the local symbols within. */
1149 finish_block (0, cstk
.old_blocks
, NULL
,
1150 cstk
.start_addr
, tmpaddr
);
1152 /* Now pop locals of block just finished. */
1153 *get_local_symbols () = cstk
.locals
;
1158 process_coff_symbol (cs
, &main_aux
, objfile
);
1163 if ((nsyms
== 0) && (pe_file
))
1165 /* We've got no debugging symbols, but it's a portable
1166 executable, so try to read the export table. */
1167 read_pe_exported_syms (reader
, objfile
);
1170 if (get_last_source_file ())
1171 coff_end_compunit_symtab (objfile
);
1173 /* Patch up any opaque types (references to types that are not defined
1174 in the file where they are referenced, e.g. "struct foo *bar"). */
1176 for (compunit_symtab
*cu
: objfile
->compunits ())
1178 for (symtab
*s
: cu
->filetabs ())
1179 patch_opaque_types (s
);
1183 coffread_objfile
= NULL
;
1186 /* Routines for reading headers and symbols from executable. */
1188 /* Read the next symbol, swap it, and return it in both
1189 internal_syment form, and coff_symbol form. Also return its first
1190 auxent, if any, in internal_auxent form, and skip any other
1194 read_one_sym (struct coff_symbol
*cs
,
1195 struct internal_syment
*sym
,
1196 union internal_auxent
*aux
)
1199 bfd_size_type bytes
;
1201 cs
->c_symnum
= symnum
;
1202 bytes
= bfd_bread (temp_sym
, local_symesz
, nlist_bfd_global
);
1203 if (bytes
!= local_symesz
)
1204 error (_("%s: error reading symbols"), objfile_name (coffread_objfile
));
1205 bfd_coff_swap_sym_in (symfile_bfd
, temp_sym
, (char *) sym
);
1206 cs
->c_naux
= sym
->n_numaux
& 0xff;
1207 if (cs
->c_naux
>= 1)
1209 bytes
= bfd_bread (temp_aux
, local_auxesz
, nlist_bfd_global
);
1210 if (bytes
!= local_auxesz
)
1211 error (_("%s: error reading symbols"), objfile_name (coffread_objfile
));
1212 bfd_coff_swap_aux_in (symfile_bfd
, temp_aux
,
1213 sym
->n_type
, sym
->n_sclass
,
1214 0, cs
->c_naux
, (char *) aux
);
1215 /* If more than one aux entry, read past it (only the first aux
1217 for (i
= 1; i
< cs
->c_naux
; i
++)
1219 bytes
= bfd_bread (temp_aux
, local_auxesz
, nlist_bfd_global
);
1220 if (bytes
!= local_auxesz
)
1221 error (_("%s: error reading symbols"),
1222 objfile_name (coffread_objfile
));
1225 cs
->c_name
= getsymname (sym
);
1226 cs
->c_value
= sym
->n_value
;
1227 cs
->c_sclass
= (sym
->n_sclass
& 0xff);
1228 cs
->c_secnum
= sym
->n_scnum
;
1229 cs
->c_type
= (unsigned) sym
->n_type
;
1230 if (!SDB_TYPE (cs
->c_type
))
1234 if (cs
->c_sclass
& 128)
1235 printf (_("thumb symbol %s, class 0x%x\n"), cs
->c_name
, cs
->c_sclass
);
1238 symnum
+= 1 + cs
->c_naux
;
1240 /* The PE file format stores symbol values as offsets within the
1241 section, rather than as absolute addresses. We correct that
1242 here, if the symbol has an appropriate storage class. FIXME: We
1243 should use BFD to read the symbols, rather than duplicating the
1247 switch (cs
->c_sclass
)
1251 case C_THUMBEXTFUNC
:
1256 case C_THUMBSTATFUNC
:
1262 if (cs
->c_secnum
!= 0)
1263 cs
->c_value
+= cs_section_address (cs
, symfile_bfd
);
1269 /* Support for string table handling. */
1272 init_stringtab (bfd
*abfd
, file_ptr offset
, gdb::unique_xmalloc_ptr
<char> *storage
)
1276 unsigned char lengthbuf
[4];
1278 /* If the file is stripped, the offset might be zero, indicating no
1279 string table. Just return with `stringtab' set to null. */
1283 if (bfd_seek (abfd
, offset
, 0) < 0)
1286 val
= bfd_bread ((char *) lengthbuf
, sizeof lengthbuf
, abfd
);
1287 length
= bfd_h_get_32 (symfile_bfd
, lengthbuf
);
1289 /* If no string table is needed, then the file may end immediately
1290 after the symbols. Just return with `stringtab' set to null. */
1291 if (val
!= sizeof lengthbuf
|| length
< sizeof lengthbuf
)
1294 storage
->reset ((char *) xmalloc (length
));
1295 stringtab
= storage
->get ();
1296 /* This is in target format (probably not very useful, and not
1297 currently used), not host format. */
1298 memcpy (stringtab
, lengthbuf
, sizeof lengthbuf
);
1299 if (length
== sizeof length
) /* Empty table -- just the count. */
1302 val
= bfd_bread (stringtab
+ sizeof lengthbuf
,
1303 length
- sizeof lengthbuf
, abfd
);
1304 if (val
!= length
- sizeof lengthbuf
|| stringtab
[length
- 1] != '\0')
1311 getsymname (struct internal_syment
*symbol_entry
)
1313 static char buffer
[SYMNMLEN
+ 1];
1316 if (symbol_entry
->_n
._n_n
._n_zeroes
== 0)
1318 /* FIXME: Probably should be detecting corrupt symbol files by
1319 seeing whether offset points to within the stringtab. */
1320 result
= stringtab
+ symbol_entry
->_n
._n_n
._n_offset
;
1324 strncpy (buffer
, symbol_entry
->_n
._n_name
, SYMNMLEN
);
1325 buffer
[SYMNMLEN
] = '\0';
1331 /* Extract the file name from the aux entry of a C_FILE symbol.
1332 Return only the last component of the name. Result is in static
1333 storage and is only good for temporary use. */
1336 coff_getfilename (union internal_auxent
*aux_entry
)
1338 static char buffer
[BUFSIZ
];
1341 if (aux_entry
->x_file
.x_n
.x_n
.x_zeroes
== 0)
1343 if (strlen (stringtab
+ aux_entry
->x_file
.x_n
.x_n
.x_offset
) >= BUFSIZ
)
1344 internal_error (__FILE__
, __LINE__
, _("coff file name too long"));
1345 strcpy (buffer
, stringtab
+ aux_entry
->x_file
.x_n
.x_n
.x_offset
);
1349 strncpy (buffer
, aux_entry
->x_file
.x_n
.x_fname
, FILNMLEN
);
1350 buffer
[FILNMLEN
] = '\0';
1354 /* FIXME: We should not be throwing away the information about what
1355 directory. It should go into dirname of the symtab, or some such
1357 result
= lbasename (result
);
1361 /* Support for line number handling. */
1363 /* Read in all the line numbers for fast lookups later. Leave them in
1364 external (unswapped) format in memory; we'll swap them as we enter
1365 them into GDB's data structures. */
1368 init_lineno (bfd
*abfd
, file_ptr offset
, file_ptr size
,
1369 gdb::unique_xmalloc_ptr
<char> *storage
)
1373 linetab_offset
= offset
;
1374 linetab_size
= size
;
1379 if (bfd_seek (abfd
, offset
, 0) < 0)
1382 /* Allocate the desired table, plus a sentinel. */
1383 storage
->reset ((char *) xmalloc (size
+ local_linesz
));
1384 linetab
= storage
->get ();
1386 val
= bfd_bread (storage
->get (), size
, abfd
);
1390 /* Terminate it with an all-zero sentinel record. */
1391 memset (linetab
+ size
, 0, local_linesz
);
1396 #if !defined (L_LNNO32)
1397 #define L_LNNO32(lp) ((lp)->l_lnno)
1401 enter_linenos (file_ptr file_offset
, int first_line
,
1402 int last_line
, struct objfile
*objfile
)
1404 struct gdbarch
*gdbarch
= objfile
->arch ();
1406 struct internal_lineno lptr
;
1410 if (file_offset
< linetab_offset
)
1412 complaint (_("Line number pointer %s lower than start of line numbers"),
1413 plongest (file_offset
));
1414 if (file_offset
> linetab_size
) /* Too big to be an offset? */
1416 file_offset
+= linetab_offset
; /* Try reading at that linetab
1420 rawptr
= &linetab
[file_offset
- linetab_offset
];
1422 /* Skip first line entry for each function. */
1423 rawptr
+= local_linesz
;
1424 /* Line numbers start at one for the first line of the function. */
1427 /* If the line number table is full (e.g. 64K lines in COFF debug
1428 info), the next function's L_LNNO32 might not be zero, so don't
1429 overstep the table's end in any case. */
1430 while (rawptr
<= &linetab
[0] + linetab_size
)
1432 bfd_coff_swap_lineno_in (symfile_bfd
, rawptr
, &lptr
);
1433 rawptr
+= local_linesz
;
1434 /* The next function, or the sentinel, will have L_LNNO32 zero;
1436 if (L_LNNO32 (&lptr
) && L_LNNO32 (&lptr
) <= last_line
)
1438 CORE_ADDR addr
= lptr
.l_addr
.l_paddr
;
1439 addr
+= objfile
->text_section_offset ();
1440 record_line (get_current_subfile (),
1441 first_line
+ L_LNNO32 (&lptr
),
1442 gdbarch_addr_bits_remove (gdbarch
, addr
));
1450 patch_type (struct type
*type
, struct type
*real_type
)
1452 struct type
*target
= TYPE_TARGET_TYPE (type
);
1453 struct type
*real_target
= TYPE_TARGET_TYPE (real_type
);
1454 int field_size
= real_target
->num_fields () * sizeof (struct field
);
1456 TYPE_LENGTH (target
) = TYPE_LENGTH (real_target
);
1457 target
->set_num_fields (real_target
->num_fields ());
1459 field
*fields
= (struct field
*) TYPE_ALLOC (target
, field_size
);
1460 memcpy (fields
, real_target
->fields (), field_size
);
1461 target
->set_fields (fields
);
1463 if (real_target
->name ())
1465 /* The previous copy of TYPE_NAME is allocated by
1466 process_coff_symbol. */
1467 xfree ((char *) target
->name ());
1468 target
->set_name (xstrdup (real_target
->name ()));
1472 /* Patch up all appropriate typedef symbols in the opaque_type_chains
1473 so that they can be used to print out opaque data structures
1477 patch_opaque_types (struct symtab
*s
)
1479 struct block_iterator iter
;
1480 struct symbol
*real_sym
;
1482 /* Go through the per-file symbols only. */
1483 const struct block
*b
= s
->compunit ()->blockvector ()->static_block ();
1484 ALL_BLOCK_SYMBOLS (b
, iter
, real_sym
)
1486 /* Find completed typedefs to use to fix opaque ones.
1487 Remove syms from the chain when their types are stored,
1488 but search the whole chain, as there may be several syms
1489 from different files with the same name. */
1490 if (real_sym
->aclass () == LOC_TYPEDEF
1491 && real_sym
->domain () == VAR_DOMAIN
1492 && real_sym
->type ()->code () == TYPE_CODE_PTR
1493 && TYPE_LENGTH (TYPE_TARGET_TYPE (real_sym
->type ())) != 0)
1495 const char *name
= real_sym
->linkage_name ();
1496 int hash
= hashname (name
);
1497 struct symbol
*sym
, *prev
;
1500 for (sym
= opaque_type_chain
[hash
]; sym
;)
1502 if (name
[0] == sym
->linkage_name ()[0]
1503 && strcmp (name
+ 1, sym
->linkage_name () + 1) == 0)
1506 prev
->set_value_chain (sym
->value_chain ());
1508 opaque_type_chain
[hash
] = sym
->value_chain ();
1510 patch_type (sym
->type (), real_sym
->type ());
1513 sym
= prev
->value_chain ();
1515 sym
= opaque_type_chain
[hash
];
1520 sym
->set_value_chain (sym
);
1528 coff_reg_to_regnum (struct symbol
*sym
, struct gdbarch
*gdbarch
)
1530 return gdbarch_sdb_reg_to_regnum (gdbarch
, sym
->value_longest ());
1533 static const struct symbol_register_ops coff_register_funcs
= {
1537 /* The "aclass" index for computed COFF symbols. */
1539 static int coff_register_index
;
1541 static struct symbol
*
1542 process_coff_symbol (struct coff_symbol
*cs
,
1543 union internal_auxent
*aux
,
1544 struct objfile
*objfile
)
1546 struct symbol
*sym
= new (&objfile
->objfile_obstack
) symbol
;
1550 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
1551 sym
->set_language (get_current_subfile ()->language
,
1552 &objfile
->objfile_obstack
);
1553 sym
->compute_and_set_names (name
, true, objfile
->per_bfd
);
1555 /* default assumptions */
1556 sym
->set_value_longest (cs
->c_value
);
1557 sym
->set_domain (VAR_DOMAIN
);
1558 sym
->set_section_index (cs_to_section (cs
, objfile
));
1560 if (ISFCN (cs
->c_type
))
1562 sym
->set_value_longest
1563 (sym
->value_longest () + objfile
->text_section_offset ());
1565 (lookup_function_type (decode_function_type (cs
, cs
->c_type
,
1568 sym
->set_aclass_index (LOC_BLOCK
);
1569 if (cs
->c_sclass
== C_STAT
|| cs
->c_sclass
== C_THUMBSTAT
1570 || cs
->c_sclass
== C_THUMBSTATFUNC
)
1571 add_symbol_to_list (sym
, get_file_symbols ());
1572 else if (cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1573 || cs
->c_sclass
== C_THUMBEXTFUNC
)
1574 add_symbol_to_list (sym
, get_global_symbols ());
1578 sym
->set_type (decode_type (cs
, cs
->c_type
, aux
, objfile
));
1579 switch (cs
->c_sclass
)
1585 sym
->set_aclass_index (LOC_LOCAL
);
1586 add_symbol_to_list (sym
, get_local_symbols ());
1590 case C_THUMBEXTFUNC
:
1592 sym
->set_aclass_index (LOC_STATIC
);
1593 sym
->set_value_address ((CORE_ADDR
) cs
->c_value
1594 + objfile
->section_offsets
[SECT_OFF_TEXT (objfile
)]);
1595 add_symbol_to_list (sym
, get_global_symbols ());
1599 case C_THUMBSTATFUNC
:
1601 sym
->set_aclass_index (LOC_STATIC
);
1602 sym
->set_value_address ((CORE_ADDR
) cs
->c_value
1603 + objfile
->section_offsets
[SECT_OFF_TEXT (objfile
)]);
1604 if (within_function
)
1606 /* Static symbol of local scope. */
1607 add_symbol_to_list (sym
, get_local_symbols ());
1611 /* Static symbol at top level of file. */
1612 add_symbol_to_list (sym
, get_file_symbols ());
1616 #ifdef C_GLBLREG /* AMD coff */
1620 sym
->set_aclass_index (coff_register_index
);
1621 sym
->set_value_longest (cs
->c_value
);
1622 add_symbol_to_list (sym
, get_local_symbols ());
1630 sym
->set_aclass_index (LOC_ARG
);
1631 sym
->set_is_argument (1);
1632 add_symbol_to_list (sym
, get_local_symbols ());
1636 sym
->set_aclass_index (coff_register_index
);
1637 sym
->set_is_argument (1);
1638 sym
->set_value_longest (cs
->c_value
);
1639 add_symbol_to_list (sym
, get_local_symbols ());
1643 sym
->set_aclass_index (LOC_TYPEDEF
);
1644 sym
->set_domain (VAR_DOMAIN
);
1646 /* If type has no name, give it one. */
1647 if (sym
->type ()->name () == 0)
1649 if (sym
->type ()->code () == TYPE_CODE_PTR
1650 || sym
->type ()->code () == TYPE_CODE_FUNC
)
1652 /* If we are giving a name to a type such as
1653 "pointer to foo" or "function returning foo", we
1654 better not set the TYPE_NAME. If the program
1655 contains "typedef char *caddr_t;", we don't want
1656 all variables of type char * to print as caddr_t.
1657 This is not just a consequence of GDB's type
1658 management; CC and GCC (at least through version
1659 2.4) both output variables of either type char *
1660 or caddr_t with the type refering to the C_TPDEF
1661 symbol for caddr_t. If a future compiler cleans
1662 this up it GDB is not ready for it yet, but if it
1663 becomes ready we somehow need to disable this
1664 check (without breaking the PCC/GCC2.4 case).
1668 Fortunately, this check seems not to be necessary
1669 for anything except pointers or functions. */
1673 sym
->type ()->set_name (xstrdup (sym
->linkage_name ()));
1676 /* Keep track of any type which points to empty structured
1677 type, so it can be filled from a definition from another
1678 file. A simple forward reference (TYPE_CODE_UNDEF) is
1679 not an empty structured type, though; the forward
1680 references work themselves out via the magic of
1681 coff_lookup_type. */
1682 if (sym
->type ()->code () == TYPE_CODE_PTR
1683 && TYPE_LENGTH (TYPE_TARGET_TYPE (sym
->type ())) == 0
1684 && TYPE_TARGET_TYPE (sym
->type ())->code ()
1687 int i
= hashname (sym
->linkage_name ());
1689 sym
->set_value_chain (opaque_type_chain
[i
]);
1690 opaque_type_chain
[i
] = sym
;
1692 add_symbol_to_list (sym
, get_file_symbols ());
1698 sym
->set_aclass_index (LOC_TYPEDEF
);
1699 sym
->set_domain (STRUCT_DOMAIN
);
1701 /* Some compilers try to be helpful by inventing "fake"
1702 names for anonymous enums, structures, and unions, like
1703 "~0fake" or ".0fake". Thanks, but no thanks... */
1704 if (sym
->type ()->name () == 0)
1705 if (sym
->linkage_name () != NULL
1706 && *sym
->linkage_name () != '~'
1707 && *sym
->linkage_name () != '.')
1708 sym
->type ()->set_name (xstrdup (sym
->linkage_name ()));
1710 add_symbol_to_list (sym
, get_file_symbols ());
1720 /* Decode a coff type specifier; return the type that is meant. */
1722 static struct type
*
1723 decode_type (struct coff_symbol
*cs
, unsigned int c_type
,
1724 union internal_auxent
*aux
, struct objfile
*objfile
)
1726 struct type
*type
= 0;
1727 unsigned int new_c_type
;
1729 if (c_type
& ~N_BTMASK
)
1731 new_c_type
= DECREF (c_type
);
1734 type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1735 type
= lookup_pointer_type (type
);
1737 else if (ISFCN (c_type
))
1739 type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1740 type
= lookup_function_type (type
);
1742 else if (ISARY (c_type
))
1745 unsigned short *dim
;
1746 struct type
*base_type
, *index_type
, *range_type
;
1748 /* Define an array type. */
1749 /* auxent refers to array, not base type. */
1750 if (aux
->x_sym
.x_tagndx
.l
== 0)
1753 /* Shift the indices down. */
1754 dim
= &aux
->x_sym
.x_fcnary
.x_ary
.x_dimen
[0];
1757 for (i
= 0; *dim
&& i
< DIMNUM
- 1; i
++, dim
++)
1761 base_type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1762 index_type
= objfile_type (objfile
)->builtin_int
;
1764 = create_static_range_type (NULL
, index_type
, 0, n
- 1);
1766 create_array_type (NULL
, base_type
, range_type
);
1771 /* Reference to existing type. This only occurs with the struct,
1772 union, and enum types. EPI a29k coff fakes us out by producing
1773 aux entries with a nonzero x_tagndx for definitions of structs,
1774 unions, and enums, so we have to check the c_sclass field. SCO
1775 3.2v4 cc gets confused with pointers to pointers to defined
1776 structs, and generates negative x_tagndx fields. */
1777 if (cs
->c_naux
> 0 && aux
->x_sym
.x_tagndx
.l
!= 0)
1779 if (cs
->c_sclass
!= C_STRTAG
1780 && cs
->c_sclass
!= C_UNTAG
1781 && cs
->c_sclass
!= C_ENTAG
1782 && aux
->x_sym
.x_tagndx
.l
>= 0)
1784 type
= coff_alloc_type (aux
->x_sym
.x_tagndx
.l
);
1789 complaint (_("Symbol table entry for %s has bad tagndx value"),
1791 /* And fall through to decode_base_type... */
1795 return decode_base_type (cs
, BTYPE (c_type
), aux
, objfile
);
1798 /* Decode a coff type specifier for function definition;
1799 return the type that the function returns. */
1801 static struct type
*
1802 decode_function_type (struct coff_symbol
*cs
,
1803 unsigned int c_type
,
1804 union internal_auxent
*aux
,
1805 struct objfile
*objfile
)
1807 if (aux
->x_sym
.x_tagndx
.l
== 0)
1808 cs
->c_naux
= 0; /* auxent refers to function, not base
1811 return decode_type (cs
, DECREF (c_type
), aux
, objfile
);
1814 /* Basic C types. */
1816 static struct type
*
1817 decode_base_type (struct coff_symbol
*cs
,
1818 unsigned int c_type
,
1819 union internal_auxent
*aux
,
1820 struct objfile
*objfile
)
1822 struct gdbarch
*gdbarch
= objfile
->arch ();
1828 /* Shows up with "void (*foo)();" structure members. */
1829 return objfile_type (objfile
)->builtin_void
;
1833 /* Intel 960 COFF has this symbol and meaning. */
1834 return objfile_type (objfile
)->builtin_void
;
1838 return objfile_type (objfile
)->builtin_char
;
1841 return objfile_type (objfile
)->builtin_short
;
1844 return objfile_type (objfile
)->builtin_int
;
1847 if (cs
->c_sclass
== C_FIELD
1848 && aux
->x_sym
.x_misc
.x_lnsz
.x_size
1849 > gdbarch_long_bit (gdbarch
))
1850 return objfile_type (objfile
)->builtin_long_long
;
1852 return objfile_type (objfile
)->builtin_long
;
1855 return objfile_type (objfile
)->builtin_float
;
1858 return objfile_type (objfile
)->builtin_double
;
1861 return objfile_type (objfile
)->builtin_long_double
;
1864 if (cs
->c_naux
!= 1)
1866 /* Anonymous structure type. */
1867 type
= coff_alloc_type (cs
->c_symnum
);
1868 type
->set_code (TYPE_CODE_STRUCT
);
1869 type
->set_name (NULL
);
1870 INIT_CPLUS_SPECIFIC (type
);
1871 TYPE_LENGTH (type
) = 0;
1872 type
->set_fields (nullptr);
1873 type
->set_num_fields (0);
1877 type
= coff_read_struct_type (cs
->c_symnum
,
1878 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
1879 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
1885 if (cs
->c_naux
!= 1)
1887 /* Anonymous union type. */
1888 type
= coff_alloc_type (cs
->c_symnum
);
1889 type
->set_name (NULL
);
1890 INIT_CPLUS_SPECIFIC (type
);
1891 TYPE_LENGTH (type
) = 0;
1892 type
->set_fields (nullptr);
1893 type
->set_num_fields (0);
1897 type
= coff_read_struct_type (cs
->c_symnum
,
1898 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
1899 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
1902 type
->set_code (TYPE_CODE_UNION
);
1906 if (cs
->c_naux
!= 1)
1908 /* Anonymous enum type. */
1909 type
= coff_alloc_type (cs
->c_symnum
);
1910 type
->set_code (TYPE_CODE_ENUM
);
1911 type
->set_name (NULL
);
1912 TYPE_LENGTH (type
) = 0;
1913 type
->set_fields (nullptr);
1914 type
->set_num_fields (0);
1918 type
= coff_read_enum_type (cs
->c_symnum
,
1919 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
1920 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
1926 /* Shouldn't show up here. */
1930 return objfile_type (objfile
)->builtin_unsigned_char
;
1933 return objfile_type (objfile
)->builtin_unsigned_short
;
1936 return objfile_type (objfile
)->builtin_unsigned_int
;
1939 if (cs
->c_sclass
== C_FIELD
1940 && aux
->x_sym
.x_misc
.x_lnsz
.x_size
1941 > gdbarch_long_bit (gdbarch
))
1942 return objfile_type (objfile
)->builtin_unsigned_long_long
;
1944 return objfile_type (objfile
)->builtin_unsigned_long
;
1946 complaint (_("Unexpected type for symbol %s"), cs
->c_name
);
1947 return objfile_type (objfile
)->builtin_void
;
1950 /* This page contains subroutines of read_type. */
1952 /* Read the description of a structure (or union type) and return an
1953 object describing the type. */
1955 static struct type
*
1956 coff_read_struct_type (int index
, int length
, int lastsym
,
1957 struct objfile
*objfile
)
1961 struct nextfield
*next
;
1966 struct nextfield
*list
= 0;
1967 struct nextfield
*newobj
;
1971 struct coff_symbol member_sym
;
1972 struct coff_symbol
*ms
= &member_sym
;
1973 struct internal_syment sub_sym
;
1974 union internal_auxent sub_aux
;
1977 type
= coff_alloc_type (index
);
1978 type
->set_code (TYPE_CODE_STRUCT
);
1979 INIT_CPLUS_SPECIFIC (type
);
1980 TYPE_LENGTH (type
) = length
;
1982 while (!done
&& symnum
< lastsym
&& symnum
< nlist_nsyms_global
)
1984 read_one_sym (ms
, &sub_sym
, &sub_aux
);
1986 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
1988 switch (ms
->c_sclass
)
1993 /* Get space to record the next field's data. */
1994 newobj
= XALLOCA (struct nextfield
);
1995 newobj
->next
= list
;
1998 /* Save the data. */
1999 list
->field
.set_name (obstack_strdup (&objfile
->objfile_obstack
,
2001 list
->field
.set_type (decode_type (ms
, ms
->c_type
, &sub_aux
,
2003 list
->field
.set_loc_bitpos (8 * ms
->c_value
);
2004 FIELD_BITSIZE (list
->field
) = 0;
2010 /* Get space to record the next field's data. */
2011 newobj
= XALLOCA (struct nextfield
);
2012 newobj
->next
= list
;
2015 /* Save the data. */
2016 list
->field
.set_name (obstack_strdup (&objfile
->objfile_obstack
,
2018 list
->field
.set_type (decode_type (ms
, ms
->c_type
, &sub_aux
,
2020 list
->field
.set_loc_bitpos (ms
->c_value
);
2021 FIELD_BITSIZE (list
->field
) = sub_aux
.x_sym
.x_misc
.x_lnsz
.x_size
;
2030 /* Now create the vector of fields, and record how big it is. */
2032 type
->set_num_fields (nfields
);
2034 ((struct field
*) TYPE_ALLOC (type
, sizeof (struct field
) * nfields
));
2036 /* Copy the saved-up fields into the field vector. */
2038 for (n
= nfields
; list
; list
= list
->next
)
2039 type
->field (--n
) = list
->field
;
2044 /* Read a definition of an enumeration type,
2045 and create and return a suitable type object.
2046 Also defines the symbols that represent the values of the type. */
2048 static struct type
*
2049 coff_read_enum_type (int index
, int length
, int lastsym
,
2050 struct objfile
*objfile
)
2052 struct gdbarch
*gdbarch
= objfile
->arch ();
2057 struct pending
**symlist
;
2058 struct coff_symbol member_sym
;
2059 struct coff_symbol
*ms
= &member_sym
;
2060 struct internal_syment sub_sym
;
2061 union internal_auxent sub_aux
;
2062 struct pending
*osyms
, *syms
;
2066 int unsigned_enum
= 1;
2068 type
= coff_alloc_type (index
);
2069 if (within_function
)
2070 symlist
= get_local_symbols ();
2072 symlist
= get_file_symbols ();
2074 o_nsyms
= osyms
? osyms
->nsyms
: 0;
2076 while (!done
&& symnum
< lastsym
&& symnum
< nlist_nsyms_global
)
2078 read_one_sym (ms
, &sub_sym
, &sub_aux
);
2080 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
2082 switch (ms
->c_sclass
)
2085 sym
= new (&objfile
->objfile_obstack
) symbol
;
2087 name
= obstack_strdup (&objfile
->objfile_obstack
, name
);
2088 sym
->set_linkage_name (name
);
2089 sym
->set_aclass_index (LOC_CONST
);
2090 sym
->set_domain (VAR_DOMAIN
);
2091 sym
->set_value_longest (ms
->c_value
);
2092 add_symbol_to_list (sym
, symlist
);
2097 /* Sometimes the linker (on 386/ix 2.0.2 at least) screws
2098 up the count of how many symbols to read. So stop
2105 /* Now fill in the fields of the type-structure. */
2108 TYPE_LENGTH (type
) = length
;
2109 else /* Assume ints. */
2110 TYPE_LENGTH (type
) = gdbarch_int_bit (gdbarch
) / TARGET_CHAR_BIT
;
2111 type
->set_code (TYPE_CODE_ENUM
);
2112 type
->set_num_fields (nsyms
);
2114 ((struct field
*) TYPE_ALLOC (type
, sizeof (struct field
) * nsyms
));
2116 /* Find the symbols for the values and put them into the type.
2117 The symbols can be found in the symlist that we put them on
2118 to cause them to be defined. osyms contains the old value
2119 of that symlist; everything up to there was defined by us. */
2120 /* Note that we preserve the order of the enum constants, so
2121 that in something like "enum {FOO, LAST_THING=FOO}" we print
2122 FOO, not LAST_THING. */
2124 for (syms
= *symlist
, n
= 0; syms
; syms
= syms
->next
)
2130 for (; j
< syms
->nsyms
; j
++, n
++)
2132 struct symbol
*xsym
= syms
->symbol
[j
];
2134 xsym
->set_type (type
);
2135 type
->field (n
).set_name (xsym
->linkage_name ());
2136 type
->field (n
).set_loc_enumval (xsym
->value_longest ());
2137 if (xsym
->value_longest () < 0)
2139 TYPE_FIELD_BITSIZE (type
, n
) = 0;
2146 type
->set_is_unsigned (true);
2151 /* Register our ability to parse symbols for coff BFD files. */
2153 static const struct sym_fns coff_sym_fns
=
2155 coff_new_init
, /* sym_new_init: init anything gbl to
2157 coff_symfile_init
, /* sym_init: read initial info, setup
2159 coff_symfile_read
, /* sym_read: read a symbol file into
2161 coff_symfile_finish
, /* sym_finish: finished with file,
2163 default_symfile_offsets
, /* sym_offsets: xlate external to
2165 default_symfile_segments
, /* sym_segments: Get segment
2166 information from a file */
2167 NULL
, /* sym_read_linetable */
2169 default_symfile_relocate
, /* sym_relocate: Relocate a debug
2171 NULL
, /* sym_probe_fns */
2174 void _initialize_coffread ();
2176 _initialize_coffread ()
2178 add_symtab_fns (bfd_target_coff_flavour
, &coff_sym_fns
);
2181 = register_symbol_register_impl (LOC_REGISTER
, &coff_register_funcs
);