1 /* Read coff symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1987-2016 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 "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 */
34 #include "gdb-stabs.h"
35 #include "stabsread.h"
36 #include "complaints.h"
39 #include "dictionary.h"
41 #include "coff-pe-read.h"
46 extern void _initialize_coffread (void);
48 /* Key for COFF-associated data. */
50 static const struct objfile_data
*coff_objfile_data_key
;
52 /* The objfile we are currently reading. */
54 static struct objfile
*coffread_objfile
;
56 struct coff_symfile_info
58 file_ptr min_lineno_offset
; /* Where in file lowest line#s are. */
59 file_ptr max_lineno_offset
; /* 1+last byte of line#s in file. */
61 CORE_ADDR textaddr
; /* Addr of .text section. */
62 unsigned int textsize
; /* Size of .text section. */
63 struct stab_section_list
*stabsects
; /* .stab sections. */
64 asection
*stabstrsect
; /* Section pointer for .stab section. */
68 /* Translate an external name string into a user-visible name. */
69 #define EXTERNAL_NAME(string, abfd) \
70 (string[0] == bfd_get_symbol_leading_char (abfd) \
71 ? string + 1 : string)
73 /* To be an sdb debug type, type must have at least a basic or primary
74 derived type. Using this rather than checking against T_NULL is
75 said to prevent core dumps if we try to operate on Michael Bloom
78 #define SDB_TYPE(type) (BTYPE(type) | (type & N_TMASK))
80 /* Core address of start and end of text of current source file.
81 This comes from a ".text" symbol where x_nlinno > 0. */
83 static CORE_ADDR current_source_start_addr
;
84 static CORE_ADDR current_source_end_addr
;
86 /* The addresses of the symbol table stream and number of symbols
87 of the object file we are reading (as copied into core). */
89 static bfd
*nlist_bfd_global
;
90 static int nlist_nsyms_global
;
93 /* Pointers to scratch storage, used for reading raw symbols and
96 static char *temp_sym
;
97 static char *temp_aux
;
99 /* Local variables that hold the shift and mask values for the
100 COFF file that we are currently reading. These come back to us
101 from BFD, and are referenced by their macro names, as well as
102 internally to the BTYPE, ISPTR, ISFCN, ISARY, ISTAG, and DECREF
103 macros from include/coff/internal.h . */
105 static unsigned local_n_btmask
;
106 static unsigned local_n_btshft
;
107 static unsigned local_n_tmask
;
108 static unsigned local_n_tshift
;
110 #define N_BTMASK local_n_btmask
111 #define N_BTSHFT local_n_btshft
112 #define N_TMASK local_n_tmask
113 #define N_TSHIFT local_n_tshift
115 /* Local variables that hold the sizes in the file of various COFF
116 structures. (We only need to know this to read them from the file
117 -- BFD will then translate the data in them, into `internal_xxx'
118 structs in the right byte order, alignment, etc.) */
120 static unsigned local_linesz
;
121 static unsigned local_symesz
;
122 static unsigned local_auxesz
;
124 /* This is set if this is a PE format file. */
128 /* Chain of typedefs of pointers to empty struct/union types.
129 They are chained thru the SYMBOL_VALUE_CHAIN. */
131 static struct symbol
*opaque_type_chain
[HASHSIZE
];
133 /* Simplified internal version of coff symbol table information. */
138 int c_symnum
; /* Symbol number of this entry. */
139 int c_naux
; /* 0 if syment only, 1 if syment +
147 /* Vector of types defined so far, indexed by their type numbers. */
149 static struct type
**type_vector
;
151 /* Number of elements allocated for type_vector currently. */
153 static int type_vector_length
;
155 /* Initial size of type vector. Is realloc'd larger if needed, and
156 realloc'd down to the size actually used, when completed. */
158 #define INITIAL_TYPE_VECTOR_LENGTH 160
160 extern void stabsread_clear_cache (void);
162 static struct type
*coff_read_struct_type (int, int, int,
165 static struct type
*decode_base_type (struct coff_symbol
*,
167 union internal_auxent
*,
170 static struct type
*decode_type (struct coff_symbol
*, unsigned int,
171 union internal_auxent
*,
174 static struct type
*decode_function_type (struct coff_symbol
*,
176 union internal_auxent
*,
179 static struct type
*coff_read_enum_type (int, int, int,
182 static struct symbol
*process_coff_symbol (struct coff_symbol
*,
183 union internal_auxent
*,
186 static void patch_opaque_types (struct symtab
*);
188 static void enter_linenos (long, int, int, struct objfile
*);
190 static void free_linetab (void);
192 static void free_linetab_cleanup (void *ignore
);
194 static int init_lineno (bfd
*, long, int);
196 static char *getsymname (struct internal_syment
*);
198 static const char *coff_getfilename (union internal_auxent
*);
200 static void free_stringtab (void);
202 static void free_stringtab_cleanup (void *ignore
);
204 static int init_stringtab (bfd
*, long);
206 static void read_one_sym (struct coff_symbol
*,
207 struct internal_syment
*,
208 union internal_auxent
*);
210 static void coff_symtab_read (long, unsigned int, struct objfile
*);
212 /* We are called once per section from coff_symfile_read. We
213 need to examine each section we are passed, check to see
214 if it is something we are interested in processing, and
215 if so, stash away some access information for the section.
217 FIXME: The section names should not be hardwired strings (what
218 should they be? I don't think most object file formats have enough
219 section flags to specify what kind of debug section it is
223 coff_locate_sections (bfd
*abfd
, asection
*sectp
, void *csip
)
225 struct coff_symfile_info
*csi
;
228 csi
= (struct coff_symfile_info
*) csip
;
229 name
= bfd_get_section_name (abfd
, sectp
);
230 if (strcmp (name
, ".text") == 0)
232 csi
->textaddr
= bfd_section_vma (abfd
, sectp
);
233 csi
->textsize
+= bfd_section_size (abfd
, sectp
);
235 else if (startswith (name
, ".text"))
237 csi
->textsize
+= bfd_section_size (abfd
, sectp
);
239 else if (strcmp (name
, ".stabstr") == 0)
241 csi
->stabstrsect
= sectp
;
243 else if (startswith (name
, ".stab"))
247 /* We can have multiple .stab sections if linked with
249 for (s
= name
+ sizeof ".stab" - 1; *s
!= '\0'; s
++)
254 struct stab_section_list
*n
, **pn
;
256 n
= XNEW (struct stab_section_list
);
259 for (pn
= &csi
->stabsects
; *pn
!= NULL
; pn
= &(*pn
)->next
)
263 /* This will be run after coffstab_build_psymtabs is called
264 in coff_symfile_read, at which point we no longer need
266 make_cleanup (xfree
, n
);
271 /* Return the section_offsets* that CS points to. */
272 static int cs_to_section (struct coff_symbol
*, struct objfile
*);
274 struct find_targ_sec_arg
281 find_targ_sec (bfd
*abfd
, asection
*sect
, void *obj
)
283 struct find_targ_sec_arg
*args
= (struct find_targ_sec_arg
*) obj
;
285 if (sect
->target_index
== args
->targ_index
)
286 *args
->resultp
= sect
;
289 /* Return the bfd_section that CS points to. */
290 static struct bfd_section
*
291 cs_to_bfd_section (struct coff_symbol
*cs
, struct objfile
*objfile
)
293 asection
*sect
= NULL
;
294 struct find_targ_sec_arg args
;
296 args
.targ_index
= cs
->c_secnum
;
297 args
.resultp
= §
;
298 bfd_map_over_sections (objfile
->obfd
, find_targ_sec
, &args
);
302 /* Return the section number (SECT_OFF_*) that CS points to. */
304 cs_to_section (struct coff_symbol
*cs
, struct objfile
*objfile
)
306 asection
*sect
= cs_to_bfd_section (cs
, objfile
);
309 return SECT_OFF_TEXT (objfile
);
310 return gdb_bfd_section_index (objfile
->obfd
, sect
);
313 /* Return the address of the section of a COFF symbol. */
315 static CORE_ADDR
cs_section_address (struct coff_symbol
*, bfd
*);
318 cs_section_address (struct coff_symbol
*cs
, bfd
*abfd
)
320 asection
*sect
= NULL
;
321 struct find_targ_sec_arg args
;
324 args
.targ_index
= cs
->c_secnum
;
325 args
.resultp
= §
;
326 bfd_map_over_sections (abfd
, find_targ_sec
, &args
);
328 addr
= bfd_get_section_vma (abfd
, sect
);
332 /* Look up a coff type-number index. Return the address of the slot
333 where the type for that index is stored.
334 The type-number is in INDEX.
336 This can be used for finding the type associated with that index
337 or for associating a new type with the index. */
339 static struct type
**
340 coff_lookup_type (int index
)
342 if (index
>= type_vector_length
)
344 int old_vector_length
= type_vector_length
;
346 type_vector_length
*= 2;
347 if (index
/* is still */ >= type_vector_length
)
348 type_vector_length
= index
* 2;
350 type_vector
= (struct type
**)
351 xrealloc ((char *) type_vector
,
352 type_vector_length
* sizeof (struct type
*));
353 memset (&type_vector
[old_vector_length
], 0,
354 (type_vector_length
- old_vector_length
) * sizeof (struct type
*));
356 return &type_vector
[index
];
359 /* Make sure there is a type allocated for type number index
360 and return the type object.
361 This can create an empty (zeroed) type object. */
364 coff_alloc_type (int index
)
366 struct type
**type_addr
= coff_lookup_type (index
);
367 struct type
*type
= *type_addr
;
369 /* If we are referring to a type not known at all yet,
370 allocate an empty type for it.
371 We will fill it in later if we find out how. */
374 type
= alloc_type (coffread_objfile
);
380 /* Start a new symtab for a new source file.
381 This is called when a COFF ".file" symbol is seen;
382 it indicates the start of data for one original source file. */
385 coff_start_symtab (struct objfile
*objfile
, const char *name
)
387 start_symtab (objfile
,
388 /* We fill in the filename later. start_symtab puts this pointer
389 into last_source_file and we put it in subfiles->name, which
390 end_symtab frees; that's why it must be malloc'd. */
392 /* We never know the directory name for COFF. */
394 /* The start address is irrelevant, since we set
395 last_source_start_addr in coff_end_symtab. */
397 record_debugformat ("COFF");
400 /* Save the vital information from when starting to read a file,
401 for use when closing off the current file.
402 NAME is the file name the symbols came from, START_ADDR is the
403 first text address for the file, and SIZE is the number of bytes of
407 complete_symtab (const char *name
, CORE_ADDR start_addr
, unsigned int size
)
409 set_last_source_file (name
);
410 current_source_start_addr
= start_addr
;
411 current_source_end_addr
= start_addr
+ size
;
414 /* Finish the symbol definitions for one main source file, close off
415 all the lexical contexts for that file (creating struct block's for
416 them), then make the struct symtab for that file and put it in the
420 coff_end_symtab (struct objfile
*objfile
)
422 last_source_start_addr
= current_source_start_addr
;
424 end_symtab (current_source_end_addr
, SECT_OFF_TEXT (objfile
));
426 /* Reinitialize for beginning of new file. */
427 set_last_source_file (NULL
);
430 /* The linker sometimes generates some non-function symbols inside
431 functions referencing variables imported from another DLL.
432 Return nonzero if the given symbol corresponds to one of them. */
435 is_import_fixup_symbol (struct coff_symbol
*cs
,
436 enum minimal_symbol_type type
)
438 /* The following is a bit of a heuristic using the characterictics
439 of these fixup symbols, but should work well in practice... */
442 /* Must be a non-static text symbol. */
443 if (type
!= mst_text
)
446 /* Must be a non-function symbol. */
447 if (ISFCN (cs
->c_type
))
450 /* The name must start with "__fu<digits>__". */
451 if (!startswith (cs
->c_name
, "__fu"))
453 if (! isdigit (cs
->c_name
[4]))
455 for (i
= 5; cs
->c_name
[i
] != '\0' && isdigit (cs
->c_name
[i
]); i
++)
456 /* Nothing, just incrementing index past all digits. */;
457 if (cs
->c_name
[i
] != '_' || cs
->c_name
[i
+ 1] != '_')
463 static struct minimal_symbol
*
464 record_minimal_symbol (struct coff_symbol
*cs
, CORE_ADDR address
,
465 enum minimal_symbol_type type
, int section
,
466 struct objfile
*objfile
)
468 /* We don't want TDESC entry points in the minimal symbol table. */
469 if (cs
->c_name
[0] == '@')
472 if (is_import_fixup_symbol (cs
, type
))
474 /* Because the value of these symbols is within a function code
475 range, these symbols interfere with the symbol-from-address
476 reverse lookup; this manifests itselfs in backtraces, or any
477 other commands that prints symbolic addresses. Just pretend
478 these symbols do not exist. */
482 return prim_record_minimal_symbol_and_info (cs
->c_name
, address
,
483 type
, section
, objfile
);
486 /* coff_symfile_init ()
487 is the coff-specific initialization routine for reading symbols.
488 It is passed a struct objfile which contains, among other things,
489 the BFD for the file whose symbols are being read, and a slot for
490 a pointer to "private data" which we fill with cookies and other
491 treats for coff_symfile_read ().
493 We will only be called if this is a COFF or COFF-like file. BFD
494 handles figuring out the format of the file, and code in symtab.c
495 uses BFD's determination to vector to us.
497 The ultimate result is a new symtab (or, FIXME, eventually a
501 coff_symfile_init (struct objfile
*objfile
)
503 struct dbx_symfile_info
*dbx
;
504 struct coff_symfile_info
*coff
;
506 /* Allocate struct to keep track of stab reading. */
507 dbx
= XCNEW (struct dbx_symfile_info
);
508 set_objfile_data (objfile
, dbx_objfile_data_key
, dbx
);
510 /* Allocate struct to keep track of the symfile. */
511 coff
= XCNEW (struct coff_symfile_info
);
512 set_objfile_data (objfile
, coff_objfile_data_key
, coff
);
514 /* COFF objects may be reordered, so set OBJF_REORDERED. If we
515 find this causes a significant slowdown in gdb then we could
516 set it in the debug symbol readers only when necessary. */
517 objfile
->flags
|= OBJF_REORDERED
;
520 /* This function is called for every section; it finds the outer
521 limits of the line table (minimum and maximum file offset) so that
522 the mainline code can read the whole thing for efficiency. */
525 find_linenos (bfd
*abfd
, struct bfd_section
*asect
, void *vpinfo
)
527 struct coff_symfile_info
*info
;
529 file_ptr offset
, maxoff
;
531 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
532 count
= asect
->lineno_count
;
533 /* End of warning. */
537 size
= count
* local_linesz
;
539 info
= (struct coff_symfile_info
*) vpinfo
;
540 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
541 offset
= asect
->line_filepos
;
542 /* End of warning. */
544 if (offset
< info
->min_lineno_offset
|| info
->min_lineno_offset
== 0)
545 info
->min_lineno_offset
= offset
;
547 maxoff
= offset
+ size
;
548 if (maxoff
> info
->max_lineno_offset
)
549 info
->max_lineno_offset
= maxoff
;
553 /* The BFD for this file -- only good while we're actively reading
554 symbols into a psymtab or a symtab. */
556 static bfd
*symfile_bfd
;
558 /* Read a symbol file, after initialization by coff_symfile_init. */
561 coff_symfile_read (struct objfile
*objfile
, int symfile_flags
)
563 struct coff_symfile_info
*info
;
564 struct dbx_symfile_info
*dbxinfo
;
565 bfd
*abfd
= objfile
->obfd
;
566 coff_data_type
*cdata
= coff_data (abfd
);
567 char *name
= bfd_get_filename (abfd
);
569 unsigned int num_symbols
;
571 int stringtab_offset
;
572 struct cleanup
*back_to
, *cleanup_minimal_symbols
;
575 info
= (struct coff_symfile_info
*) objfile_data (objfile
,
576 coff_objfile_data_key
);
577 dbxinfo
= DBX_SYMFILE_INFO (objfile
);
578 symfile_bfd
= abfd
; /* Kludge for swap routines. */
580 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
581 num_symbols
= bfd_get_symcount (abfd
); /* How many syms */
582 symtab_offset
= cdata
->sym_filepos
; /* Symbol table file offset */
583 stringtab_offset
= symtab_offset
+ /* String table file offset */
584 num_symbols
* cdata
->local_symesz
;
586 /* Set a few file-statics that give us specific information about
587 the particular COFF file format we're reading. */
588 local_n_btmask
= cdata
->local_n_btmask
;
589 local_n_btshft
= cdata
->local_n_btshft
;
590 local_n_tmask
= cdata
->local_n_tmask
;
591 local_n_tshift
= cdata
->local_n_tshift
;
592 local_linesz
= cdata
->local_linesz
;
593 local_symesz
= cdata
->local_symesz
;
594 local_auxesz
= cdata
->local_auxesz
;
596 /* Allocate space for raw symbol and aux entries, based on their
597 space requirements as reported by BFD. */
598 temp_sym
= (char *) xmalloc
599 (cdata
->local_symesz
+ cdata
->local_auxesz
);
600 temp_aux
= temp_sym
+ cdata
->local_symesz
;
601 back_to
= make_cleanup (free_current_contents
, &temp_sym
);
603 /* We need to know whether this is a PE file, because in PE files,
604 unlike standard COFF files, symbol values are stored as offsets
605 from the section address, rather than as absolute addresses.
606 FIXME: We should use BFD to read the symbol table, and thus avoid
609 startswith (bfd_get_target (objfile
->obfd
), "pe")
610 || startswith (bfd_get_target (objfile
->obfd
), "epoc-pe");
612 /* End of warning. */
614 info
->min_lineno_offset
= 0;
615 info
->max_lineno_offset
= 0;
617 /* Only read line number information if we have symbols.
619 On Windows NT, some of the system's DLL's have sections with
620 PointerToLinenumbers fields that are non-zero, but point at
621 random places within the image file. (In the case I found,
622 KERNEL32.DLL's .text section has a line number info pointer that
623 points into the middle of the string `lib\\i386\kernel32.dll'.)
625 However, these DLL's also have no symbols. The line number
626 tables are meaningless without symbols. And in fact, GDB never
627 uses the line number information unless there are symbols. So we
628 can avoid spurious error messages (and maybe run a little
629 faster!) by not even reading the line number table unless we have
633 /* Read the line number table, all at once. */
634 bfd_map_over_sections (abfd
, find_linenos
, (void *) info
);
636 make_cleanup (free_linetab_cleanup
, 0 /*ignore*/);
637 val
= init_lineno (abfd
, info
->min_lineno_offset
,
638 info
->max_lineno_offset
- info
->min_lineno_offset
);
640 error (_("\"%s\": error reading line numbers."), name
);
643 /* Now read the string table, all at once. */
645 make_cleanup (free_stringtab_cleanup
, 0 /*ignore*/);
646 val
= init_stringtab (abfd
, stringtab_offset
);
648 error (_("\"%s\": can't get string table"), name
);
650 init_minimal_symbol_collection ();
651 cleanup_minimal_symbols
= make_cleanup_discard_minimal_symbols ();
653 /* Now that the executable file is positioned at symbol table,
654 process it and define symbols accordingly. */
656 coff_symtab_read ((long) symtab_offset
, num_symbols
, objfile
);
658 /* Install any minimal symbols that have been collected as the
659 current minimal symbols for this objfile. */
661 install_minimal_symbols (objfile
);
665 struct minimal_symbol
*msym
;
667 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
669 const char *name
= MSYMBOL_LINKAGE_NAME (msym
);
671 /* If the minimal symbols whose name are prefixed by "__imp_"
672 or "_imp_", get rid of the prefix, and search the minimal
673 symbol in OBJFILE. Note that 'maintenance print msymbols'
674 shows that type of these "_imp_XXXX" symbols is mst_data. */
675 if (MSYMBOL_TYPE (msym
) == mst_data
)
677 const char *name1
= NULL
;
679 if (startswith (name
, "_imp_"))
681 else if (startswith (name
, "__imp_"))
685 int lead
= bfd_get_symbol_leading_char (objfile
->obfd
);
686 struct bound_minimal_symbol found
;
688 if (lead
!= '\0' && *name1
== lead
)
691 found
= lookup_minimal_symbol (name1
, NULL
, objfile
);
693 /* If found, there are symbols named "_imp_foo" and "foo"
694 respectively in OBJFILE. Set the type of symbol "foo"
695 as 'mst_solib_trampoline'. */
696 if (found
.minsym
!= NULL
697 && MSYMBOL_TYPE (found
.minsym
) == mst_text
)
698 MSYMBOL_TYPE (found
.minsym
) = mst_solib_trampoline
;
704 /* Free the installed minimal symbol data. */
705 do_cleanups (cleanup_minimal_symbols
);
707 bfd_map_over_sections (abfd
, coff_locate_sections
, (void *) info
);
711 if (!info
->stabstrsect
)
713 error (_("The debugging information in `%s' is corrupted.\nThe "
714 "file has a `.stabs' section, but no `.stabstr' section."),
718 /* FIXME: dubious. Why can't we use something normal like
719 bfd_get_section_contents? */
720 bfd_seek (abfd
, abfd
->where
, 0);
722 stabstrsize
= bfd_section_size (abfd
, info
->stabstrsect
);
724 coffstab_build_psymtabs (objfile
,
725 info
->textaddr
, info
->textsize
,
727 info
->stabstrsect
->filepos
, stabstrsize
);
729 if (dwarf2_has_info (objfile
, NULL
))
731 /* DWARF2 sections. */
732 dwarf2_build_psymtabs (objfile
);
735 dwarf2_build_frame_info (objfile
);
737 /* Try to add separate debug file if no symbols table found. */
738 if (!objfile_has_partial_symbols (objfile
))
742 debugfile
= find_separate_debug_file_by_buildid (objfile
);
744 if (debugfile
== NULL
)
745 debugfile
= find_separate_debug_file_by_debuglink (objfile
);
746 make_cleanup (xfree
, debugfile
);
750 bfd
*abfd
= symfile_bfd_open (debugfile
);
752 make_cleanup_bfd_unref (abfd
);
753 symbol_file_add_separate (abfd
, debugfile
, symfile_flags
, objfile
);
757 do_cleanups (back_to
);
761 coff_new_init (struct objfile
*ignore
)
765 /* Perform any local cleanups required when we are done with a
766 particular objfile. I.E, we are in the process of discarding all
767 symbol information for an objfile, freeing up all memory held for
768 it, and unlinking the objfile struct from the global list of known
772 coff_symfile_finish (struct objfile
*objfile
)
774 /* Let stabs reader clean up. */
775 stabsread_clear_cache ();
777 dwarf2_free_objfile (objfile
);
781 /* Given pointers to a symbol table in coff style exec file,
782 analyze them and create struct symtab's describing the symbols.
783 NSYMS is the number of symbols in the symbol table.
784 We read them one at a time using read_one_sym (). */
787 coff_symtab_read (long symtab_offset
, unsigned int nsyms
,
788 struct objfile
*objfile
)
790 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
791 struct context_stack
*newobj
;
792 struct coff_symbol coff_symbol
;
793 struct coff_symbol
*cs
= &coff_symbol
;
794 static struct internal_syment main_sym
;
795 static union internal_auxent main_aux
;
796 struct coff_symbol fcn_cs_saved
;
797 static struct internal_syment fcn_sym_saved
;
798 static union internal_auxent fcn_aux_saved
;
799 /* A .file is open. */
800 int in_source_file
= 0;
801 int next_file_symnum
= -1;
802 /* Name of the current file. */
803 const char *filestring
= "";
805 int fcn_first_line
= 0;
806 CORE_ADDR fcn_first_line_addr
= 0;
807 int fcn_last_line
= 0;
808 int fcn_start_addr
= 0;
809 long fcn_line_ptr
= 0;
812 struct minimal_symbol
*msym
;
814 /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous....
815 it's hard to know I've really worked around it. The fix should
816 be harmless, anyway). The symptom of the bug is that the first
817 fread (in read_one_sym), will (in my example) actually get data
818 from file offset 268, when the fseek was to 264 (and ftell shows
819 264). This causes all hell to break loose. I was unable to
820 reproduce this on a short test program which operated on the same
821 file, performing (I think) the same sequence of operations.
823 It stopped happening when I put in this (former) rewind().
825 FIXME: Find out if this has been reported to Sun, whether it has
826 been fixed in a later release, etc. */
828 bfd_seek (objfile
->obfd
, 0, 0);
830 /* Position to read the symbol table. */
831 val
= bfd_seek (objfile
->obfd
, (long) symtab_offset
, 0);
833 perror_with_name (objfile_name (objfile
));
835 coffread_objfile
= objfile
;
836 nlist_bfd_global
= objfile
->obfd
;
837 nlist_nsyms_global
= nsyms
;
838 set_last_source_file (NULL
);
839 memset (opaque_type_chain
, 0, sizeof opaque_type_chain
);
841 if (type_vector
) /* Get rid of previous one. */
843 type_vector_length
= INITIAL_TYPE_VECTOR_LENGTH
;
844 type_vector
= XCNEWVEC (struct type
*, type_vector_length
);
846 coff_start_symtab (objfile
, "");
849 while (symnum
< nsyms
)
851 QUIT
; /* Make this command interruptable. */
853 read_one_sym (cs
, &main_sym
, &main_aux
);
855 if (cs
->c_symnum
== next_file_symnum
&& cs
->c_sclass
!= C_FILE
)
857 if (get_last_source_file ())
858 coff_end_symtab (objfile
);
860 coff_start_symtab (objfile
, "_globals_");
861 /* coff_start_symtab will set the language of this symtab to
862 language_unknown, since such a ``file name'' is not
863 recognized. Override that with the minimal language to
864 allow printing values in this symtab. */
865 current_subfile
->language
= language_minimal
;
866 complete_symtab ("_globals_", 0, 0);
867 /* Done with all files, everything from here on out is
871 /* Special case for file with type declarations only, no
873 if (!get_last_source_file () && SDB_TYPE (cs
->c_type
)
874 && cs
->c_secnum
== N_DEBUG
)
875 complete_symtab (filestring
, 0, 0);
877 /* Typedefs should not be treated as symbol definitions. */
878 if (ISFCN (cs
->c_type
) && cs
->c_sclass
!= C_TPDEF
)
880 /* Record all functions -- external and static -- in
882 int section
= cs_to_section (cs
, objfile
);
884 tmpaddr
= cs
->c_value
;
885 record_minimal_symbol (cs
, tmpaddr
, mst_text
,
888 fcn_line_ptr
= main_aux
.x_sym
.x_fcnary
.x_fcn
.x_lnnoptr
;
889 fcn_start_addr
= tmpaddr
;
891 fcn_sym_saved
= main_sym
;
892 fcn_aux_saved
= main_aux
;
896 switch (cs
->c_sclass
)
905 complaint (&symfile_complaints
,
906 _("Bad n_sclass for symbol %s"),
911 /* c_value field contains symnum of next .file entry in
912 table or symnum of first global after last .file. */
913 next_file_symnum
= cs
->c_value
;
915 filestring
= coff_getfilename (&main_aux
);
919 /* Complete symbol table for last object file
920 containing debugging information. */
921 if (get_last_source_file ())
923 coff_end_symtab (objfile
);
924 coff_start_symtab (objfile
, filestring
);
929 /* C_LABEL is used for labels and static functions.
930 Including it here allows gdb to see static functions when
931 no debug info is available. */
933 /* However, labels within a function can make weird
934 backtraces, so filter them out (from phdm@macqel.be). */
940 case C_THUMBSTATFUNC
:
941 if (cs
->c_name
[0] == '.')
943 if (strcmp (cs
->c_name
, ".text") == 0)
945 /* FIXME: don't wire in ".text" as section name or
947 /* Check for in_source_file deals with case of a
948 file with debugging symbols followed by a later
949 file with no symbols. */
951 complete_symtab (filestring
,
952 cs
->c_value
+ ANOFFSET (objfile
->section_offsets
,
953 SECT_OFF_TEXT (objfile
)),
954 main_aux
.x_scn
.x_scnlen
);
957 /* Flush rest of '.' symbols. */
960 else if (!SDB_TYPE (cs
->c_type
)
961 && cs
->c_name
[0] == 'L'
962 && (startswith (cs
->c_name
, "LI%")
963 || startswith (cs
->c_name
, "LF%")
964 || startswith (cs
->c_name
, "LC%")
965 || startswith (cs
->c_name
, "LP%")
966 || startswith (cs
->c_name
, "LPB%")
967 || startswith (cs
->c_name
, "LBB%")
968 || startswith (cs
->c_name
, "LBE%")
969 || startswith (cs
->c_name
, "LPBX%")))
970 /* At least on a 3b1, gcc generates swbeg and string labels
971 that look like this. Ignore them. */
973 /* Fall in for static symbols that don't start with '.' */
978 /* Record it in the minimal symbols regardless of
979 SDB_TYPE. This parallels what we do for other debug
980 formats, and probably is needed to make
981 print_address_symbolic work right without the (now
982 gone) "set fast-symbolic-addr off" kludge. */
984 enum minimal_symbol_type ms_type
;
986 CORE_ADDR offset
= 0;
988 if (cs
->c_secnum
== N_UNDEF
)
990 /* This is a common symbol. We used to rely on
991 the target to tell us whether it knows where
992 the symbol has been relocated to, but none of
993 the target implementations actually provided
994 that operation. So we just ignore the symbol,
995 the same way we would do if we had a target-side
996 symbol lookup which returned no match. */
999 else if (cs
->c_secnum
== N_ABS
)
1001 /* Use the correct minimal symbol type (and don't
1002 relocate) for absolute values. */
1004 sec
= cs_to_section (cs
, objfile
);
1005 tmpaddr
= cs
->c_value
;
1009 asection
*bfd_section
= cs_to_bfd_section (cs
, objfile
);
1011 sec
= cs_to_section (cs
, objfile
);
1012 tmpaddr
= cs
->c_value
;
1013 /* Statics in a PE file also get relocated. */
1014 if (cs
->c_sclass
== C_EXT
1015 || cs
->c_sclass
== C_THUMBEXTFUNC
1016 || cs
->c_sclass
== C_THUMBEXT
1017 || (pe_file
&& (cs
->c_sclass
== C_STAT
)))
1018 offset
= ANOFFSET (objfile
->section_offsets
, sec
);
1020 if (bfd_section
->flags
& SEC_CODE
)
1023 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXTFUNC
1024 || cs
->c_sclass
== C_THUMBEXT
?
1025 mst_text
: mst_file_text
;
1026 tmpaddr
= gdbarch_addr_bits_remove (gdbarch
, tmpaddr
);
1028 else if (bfd_section
->flags
& SEC_ALLOC
1029 && bfd_section
->flags
& SEC_LOAD
)
1032 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1033 ? mst_data
: mst_file_data
;
1035 else if (bfd_section
->flags
& SEC_ALLOC
)
1038 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1039 ? mst_bss
: mst_file_bss
;
1042 ms_type
= mst_unknown
;
1045 msym
= record_minimal_symbol (cs
, tmpaddr
, ms_type
,
1048 gdbarch_coff_make_msymbol_special (gdbarch
,
1049 cs
->c_sclass
, msym
);
1051 if (SDB_TYPE (cs
->c_type
))
1055 sym
= process_coff_symbol
1056 (cs
, &main_aux
, objfile
);
1057 SYMBOL_VALUE (sym
) = tmpaddr
+ offset
;
1058 SYMBOL_SECTION (sym
) = sec
;
1064 if (strcmp (cs
->c_name
, ".bf") == 0)
1066 within_function
= 1;
1068 /* Value contains address of first non-init type
1070 /* main_aux.x_sym.x_misc.x_lnsz.x_lnno
1071 contains line number of '{' }. */
1072 if (cs
->c_naux
!= 1)
1073 complaint (&symfile_complaints
,
1074 _("`.bf' symbol %d has no aux entry"),
1076 fcn_first_line
= main_aux
.x_sym
.x_misc
.x_lnsz
.x_lnno
;
1077 fcn_first_line_addr
= cs
->c_value
;
1079 /* Might want to check that locals are 0 and
1080 context_stack_depth is zero, and complain if not. */
1083 newobj
= push_context (depth
, fcn_start_addr
);
1084 fcn_cs_saved
.c_name
= getsymname (&fcn_sym_saved
);
1086 process_coff_symbol (&fcn_cs_saved
,
1087 &fcn_aux_saved
, objfile
);
1089 else if (strcmp (cs
->c_name
, ".ef") == 0)
1091 if (!within_function
)
1092 error (_("Bad coff function information."));
1093 /* The value of .ef is the address of epilogue code;
1094 not useful for gdb. */
1095 /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
1096 contains number of lines to '}' */
1098 if (context_stack_depth
<= 0)
1099 { /* We attempted to pop an empty context stack. */
1100 complaint (&symfile_complaints
,
1101 _("`.ef' symbol without matching `.bf' "
1102 "symbol ignored starting at symnum %d"),
1104 within_function
= 0;
1108 newobj
= pop_context ();
1109 /* Stack must be empty now. */
1110 if (context_stack_depth
> 0 || newobj
== NULL
)
1112 complaint (&symfile_complaints
,
1113 _("Unmatched .ef symbol(s) ignored "
1114 "starting at symnum %d"),
1116 within_function
= 0;
1119 if (cs
->c_naux
!= 1)
1121 complaint (&symfile_complaints
,
1122 _("`.ef' symbol %d has no aux entry"),
1124 fcn_last_line
= 0x7FFFFFFF;
1128 fcn_last_line
= main_aux
.x_sym
.x_misc
.x_lnsz
.x_lnno
;
1130 /* fcn_first_line is the line number of the opening '{'.
1131 Do not record it - because it would affect gdb's idea
1132 of the line number of the first statement of the
1133 function - except for one-line functions, for which
1134 it is also the line number of all the statements and
1135 of the closing '}', and for which we do not have any
1136 other statement-line-number. */
1137 if (fcn_last_line
== 1)
1138 record_line (current_subfile
, fcn_first_line
,
1139 gdbarch_addr_bits_remove (gdbarch
,
1140 fcn_first_line_addr
));
1142 enter_linenos (fcn_line_ptr
, fcn_first_line
,
1143 fcn_last_line
, objfile
);
1145 finish_block (newobj
->name
, &local_symbols
, newobj
->old_blocks
,
1146 NULL
, newobj
->start_addr
,
1147 fcn_cs_saved
.c_value
1148 + fcn_aux_saved
.x_sym
.x_misc
.x_fsize
1149 + ANOFFSET (objfile
->section_offsets
,
1150 SECT_OFF_TEXT (objfile
)));
1151 within_function
= 0;
1156 if (strcmp (cs
->c_name
, ".bb") == 0)
1158 tmpaddr
= cs
->c_value
;
1159 tmpaddr
+= ANOFFSET (objfile
->section_offsets
,
1160 SECT_OFF_TEXT (objfile
));
1161 push_context (++depth
, tmpaddr
);
1163 else if (strcmp (cs
->c_name
, ".eb") == 0)
1165 if (context_stack_depth
<= 0)
1166 { /* We attempted to pop an empty context stack. */
1167 complaint (&symfile_complaints
,
1168 _("`.eb' symbol without matching `.bb' "
1169 "symbol ignored starting at symnum %d"),
1174 newobj
= pop_context ();
1175 if (depth
-- != newobj
->depth
)
1177 complaint (&symfile_complaints
,
1178 _("Mismatched .eb symbol ignored "
1179 "starting at symnum %d"),
1183 if (local_symbols
&& context_stack_depth
> 0)
1186 cs
->c_value
+ ANOFFSET (objfile
->section_offsets
,
1187 SECT_OFF_TEXT (objfile
));
1188 /* Make a block for the local symbols within. */
1189 finish_block (0, &local_symbols
, newobj
->old_blocks
, NULL
,
1190 newobj
->start_addr
, tmpaddr
);
1192 /* Now pop locals of block just finished. */
1193 local_symbols
= newobj
->locals
;
1198 process_coff_symbol (cs
, &main_aux
, objfile
);
1203 if ((nsyms
== 0) && (pe_file
))
1205 /* We've got no debugging symbols, but it's a portable
1206 executable, so try to read the export table. */
1207 read_pe_exported_syms (objfile
);
1210 if (get_last_source_file ())
1211 coff_end_symtab (objfile
);
1213 /* Patch up any opaque types (references to types that are not defined
1214 in the file where they are referenced, e.g. "struct foo *bar"). */
1216 struct compunit_symtab
*cu
;
1219 ALL_OBJFILE_FILETABS (objfile
, cu
, s
)
1220 patch_opaque_types (s
);
1223 coffread_objfile
= NULL
;
1226 /* Routines for reading headers and symbols from executable. */
1228 /* Read the next symbol, swap it, and return it in both
1229 internal_syment form, and coff_symbol form. Also return its first
1230 auxent, if any, in internal_auxent form, and skip any other
1234 read_one_sym (struct coff_symbol
*cs
,
1235 struct internal_syment
*sym
,
1236 union internal_auxent
*aux
)
1239 bfd_size_type bytes
;
1241 cs
->c_symnum
= symnum
;
1242 bytes
= bfd_bread (temp_sym
, local_symesz
, nlist_bfd_global
);
1243 if (bytes
!= local_symesz
)
1244 error (_("%s: error reading symbols"), objfile_name (coffread_objfile
));
1245 bfd_coff_swap_sym_in (symfile_bfd
, temp_sym
, (char *) sym
);
1246 cs
->c_naux
= sym
->n_numaux
& 0xff;
1247 if (cs
->c_naux
>= 1)
1249 bytes
= bfd_bread (temp_aux
, local_auxesz
, nlist_bfd_global
);
1250 if (bytes
!= local_auxesz
)
1251 error (_("%s: error reading symbols"), objfile_name (coffread_objfile
));
1252 bfd_coff_swap_aux_in (symfile_bfd
, temp_aux
,
1253 sym
->n_type
, sym
->n_sclass
,
1254 0, cs
->c_naux
, (char *) aux
);
1255 /* If more than one aux entry, read past it (only the first aux
1257 for (i
= 1; i
< cs
->c_naux
; i
++)
1259 bytes
= bfd_bread (temp_aux
, local_auxesz
, nlist_bfd_global
);
1260 if (bytes
!= local_auxesz
)
1261 error (_("%s: error reading symbols"),
1262 objfile_name (coffread_objfile
));
1265 cs
->c_name
= getsymname (sym
);
1266 cs
->c_value
= sym
->n_value
;
1267 cs
->c_sclass
= (sym
->n_sclass
& 0xff);
1268 cs
->c_secnum
= sym
->n_scnum
;
1269 cs
->c_type
= (unsigned) sym
->n_type
;
1270 if (!SDB_TYPE (cs
->c_type
))
1274 if (cs
->c_sclass
& 128)
1275 printf (_("thumb symbol %s, class 0x%x\n"), cs
->c_name
, cs
->c_sclass
);
1278 symnum
+= 1 + cs
->c_naux
;
1280 /* The PE file format stores symbol values as offsets within the
1281 section, rather than as absolute addresses. We correct that
1282 here, if the symbol has an appropriate storage class. FIXME: We
1283 should use BFD to read the symbols, rather than duplicating the
1287 switch (cs
->c_sclass
)
1291 case C_THUMBEXTFUNC
:
1296 case C_THUMBSTATFUNC
:
1302 if (cs
->c_secnum
!= 0)
1303 cs
->c_value
+= cs_section_address (cs
, symfile_bfd
);
1309 /* Support for string table handling. */
1311 static char *stringtab
= NULL
;
1314 init_stringtab (bfd
*abfd
, long offset
)
1318 unsigned char lengthbuf
[4];
1322 /* If the file is stripped, the offset might be zero, indicating no
1323 string table. Just return with `stringtab' set to null. */
1327 if (bfd_seek (abfd
, offset
, 0) < 0)
1330 val
= bfd_bread ((char *) lengthbuf
, sizeof lengthbuf
, abfd
);
1331 length
= bfd_h_get_32 (symfile_bfd
, lengthbuf
);
1333 /* If no string table is needed, then the file may end immediately
1334 after the symbols. Just return with `stringtab' set to null. */
1335 if (val
!= sizeof lengthbuf
|| length
< sizeof lengthbuf
)
1338 stringtab
= (char *) xmalloc (length
);
1339 /* This is in target format (probably not very useful, and not
1340 currently used), not host format. */
1341 memcpy (stringtab
, lengthbuf
, sizeof lengthbuf
);
1342 if (length
== sizeof length
) /* Empty table -- just the count. */
1345 val
= bfd_bread (stringtab
+ sizeof lengthbuf
,
1346 length
- sizeof lengthbuf
, abfd
);
1347 if (val
!= length
- sizeof lengthbuf
|| stringtab
[length
- 1] != '\0')
1354 free_stringtab (void)
1362 free_stringtab_cleanup (void *ignore
)
1368 getsymname (struct internal_syment
*symbol_entry
)
1370 static char buffer
[SYMNMLEN
+ 1];
1373 if (symbol_entry
->_n
._n_n
._n_zeroes
== 0)
1375 /* FIXME: Probably should be detecting corrupt symbol files by
1376 seeing whether offset points to within the stringtab. */
1377 result
= stringtab
+ symbol_entry
->_n
._n_n
._n_offset
;
1381 strncpy (buffer
, symbol_entry
->_n
._n_name
, SYMNMLEN
);
1382 buffer
[SYMNMLEN
] = '\0';
1388 /* Extract the file name from the aux entry of a C_FILE symbol.
1389 Return only the last component of the name. Result is in static
1390 storage and is only good for temporary use. */
1393 coff_getfilename (union internal_auxent
*aux_entry
)
1395 static char buffer
[BUFSIZ
];
1398 if (aux_entry
->x_file
.x_n
.x_zeroes
== 0)
1400 if (strlen (stringtab
+ aux_entry
->x_file
.x_n
.x_offset
) >= BUFSIZ
)
1401 internal_error (__FILE__
, __LINE__
, _("coff file name too long"));
1402 strcpy (buffer
, stringtab
+ aux_entry
->x_file
.x_n
.x_offset
);
1406 strncpy (buffer
, aux_entry
->x_file
.x_fname
, FILNMLEN
);
1407 buffer
[FILNMLEN
] = '\0';
1411 /* FIXME: We should not be throwing away the information about what
1412 directory. It should go into dirname of the symtab, or some such
1414 result
= lbasename (result
);
1418 /* Support for line number handling. */
1420 static char *linetab
= NULL
;
1421 static long linetab_offset
;
1422 static unsigned long linetab_size
;
1424 /* Read in all the line numbers for fast lookups later. Leave them in
1425 external (unswapped) format in memory; we'll swap them as we enter
1426 them into GDB's data structures. */
1429 init_lineno (bfd
*abfd
, long offset
, int size
)
1433 linetab_offset
= offset
;
1434 linetab_size
= size
;
1441 if (bfd_seek (abfd
, offset
, 0) < 0)
1444 /* Allocate the desired table, plus a sentinel. */
1445 linetab
= (char *) xmalloc (size
+ local_linesz
);
1447 val
= bfd_bread (linetab
, size
, abfd
);
1451 /* Terminate it with an all-zero sentinel record. */
1452 memset (linetab
+ size
, 0, local_linesz
);
1466 free_linetab_cleanup (void *ignore
)
1471 #if !defined (L_LNNO32)
1472 #define L_LNNO32(lp) ((lp)->l_lnno)
1476 enter_linenos (long file_offset
, int first_line
,
1477 int last_line
, struct objfile
*objfile
)
1479 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
1481 struct internal_lineno lptr
;
1485 if (file_offset
< linetab_offset
)
1487 complaint (&symfile_complaints
,
1488 _("Line number pointer %ld lower than start of line numbers"),
1490 if (file_offset
> linetab_size
) /* Too big to be an offset? */
1492 file_offset
+= linetab_offset
; /* Try reading at that linetab
1496 rawptr
= &linetab
[file_offset
- linetab_offset
];
1498 /* Skip first line entry for each function. */
1499 rawptr
+= local_linesz
;
1500 /* Line numbers start at one for the first line of the function. */
1503 /* If the line number table is full (e.g. 64K lines in COFF debug
1504 info), the next function's L_LNNO32 might not be zero, so don't
1505 overstep the table's end in any case. */
1506 while (rawptr
<= &linetab
[0] + linetab_size
)
1508 bfd_coff_swap_lineno_in (symfile_bfd
, rawptr
, &lptr
);
1509 rawptr
+= local_linesz
;
1510 /* The next function, or the sentinel, will have L_LNNO32 zero;
1512 if (L_LNNO32 (&lptr
) && L_LNNO32 (&lptr
) <= last_line
)
1514 CORE_ADDR addr
= lptr
.l_addr
.l_paddr
;
1515 addr
+= ANOFFSET (objfile
->section_offsets
,
1516 SECT_OFF_TEXT (objfile
));
1517 record_line (current_subfile
,
1518 first_line
+ L_LNNO32 (&lptr
),
1519 gdbarch_addr_bits_remove (gdbarch
, addr
));
1527 patch_type (struct type
*type
, struct type
*real_type
)
1529 struct type
*target
= TYPE_TARGET_TYPE (type
);
1530 struct type
*real_target
= TYPE_TARGET_TYPE (real_type
);
1531 int field_size
= TYPE_NFIELDS (real_target
) * sizeof (struct field
);
1533 TYPE_LENGTH (target
) = TYPE_LENGTH (real_target
);
1534 TYPE_NFIELDS (target
) = TYPE_NFIELDS (real_target
);
1535 TYPE_FIELDS (target
) = (struct field
*) TYPE_ALLOC (target
,
1538 memcpy (TYPE_FIELDS (target
),
1539 TYPE_FIELDS (real_target
),
1542 if (TYPE_NAME (real_target
))
1544 /* The previous copy of TYPE_NAME is allocated by
1545 process_coff_symbol. */
1546 if (TYPE_NAME (target
))
1547 xfree ((char*) TYPE_NAME (target
));
1548 TYPE_NAME (target
) = xstrdup (TYPE_NAME (real_target
));
1552 /* Patch up all appropriate typedef symbols in the opaque_type_chains
1553 so that they can be used to print out opaque data structures
1557 patch_opaque_types (struct symtab
*s
)
1560 struct block_iterator iter
;
1561 struct symbol
*real_sym
;
1563 /* Go through the per-file symbols only. */
1564 b
= BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (s
), STATIC_BLOCK
);
1565 ALL_BLOCK_SYMBOLS (b
, iter
, real_sym
)
1567 /* Find completed typedefs to use to fix opaque ones.
1568 Remove syms from the chain when their types are stored,
1569 but search the whole chain, as there may be several syms
1570 from different files with the same name. */
1571 if (SYMBOL_CLASS (real_sym
) == LOC_TYPEDEF
1572 && SYMBOL_DOMAIN (real_sym
) == VAR_DOMAIN
1573 && TYPE_CODE (SYMBOL_TYPE (real_sym
)) == TYPE_CODE_PTR
1574 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym
))) != 0)
1576 const char *name
= SYMBOL_LINKAGE_NAME (real_sym
);
1577 int hash
= hashname (name
);
1578 struct symbol
*sym
, *prev
;
1581 for (sym
= opaque_type_chain
[hash
]; sym
;)
1583 if (name
[0] == SYMBOL_LINKAGE_NAME (sym
)[0]
1584 && strcmp (name
+ 1, SYMBOL_LINKAGE_NAME (sym
) + 1) == 0)
1588 SYMBOL_VALUE_CHAIN (prev
) = SYMBOL_VALUE_CHAIN (sym
);
1592 opaque_type_chain
[hash
] = SYMBOL_VALUE_CHAIN (sym
);
1595 patch_type (SYMBOL_TYPE (sym
), SYMBOL_TYPE (real_sym
));
1599 sym
= SYMBOL_VALUE_CHAIN (prev
);
1603 sym
= opaque_type_chain
[hash
];
1609 sym
= SYMBOL_VALUE_CHAIN (sym
);
1617 coff_reg_to_regnum (struct symbol
*sym
, struct gdbarch
*gdbarch
)
1619 return gdbarch_sdb_reg_to_regnum (gdbarch
, SYMBOL_VALUE (sym
));
1622 static const struct symbol_register_ops coff_register_funcs
= {
1626 /* The "aclass" index for computed COFF symbols. */
1628 static int coff_register_index
;
1630 static struct symbol
*
1631 process_coff_symbol (struct coff_symbol
*cs
,
1632 union internal_auxent
*aux
,
1633 struct objfile
*objfile
)
1635 struct symbol
*sym
= allocate_symbol (objfile
);
1639 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
1640 SYMBOL_SET_LANGUAGE (sym
, current_subfile
->language
,
1641 &objfile
->objfile_obstack
);
1642 SYMBOL_SET_NAMES (sym
, name
, strlen (name
), 1, objfile
);
1644 /* default assumptions */
1645 SYMBOL_VALUE (sym
) = cs
->c_value
;
1646 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
1647 SYMBOL_SECTION (sym
) = cs_to_section (cs
, objfile
);
1649 if (ISFCN (cs
->c_type
))
1651 SYMBOL_VALUE (sym
) += ANOFFSET (objfile
->section_offsets
,
1652 SECT_OFF_TEXT (objfile
));
1654 lookup_function_type (decode_function_type (cs
, cs
->c_type
,
1657 SYMBOL_ACLASS_INDEX (sym
) = LOC_BLOCK
;
1658 if (cs
->c_sclass
== C_STAT
|| cs
->c_sclass
== C_THUMBSTAT
1659 || cs
->c_sclass
== C_THUMBSTATFUNC
)
1660 add_symbol_to_list (sym
, &file_symbols
);
1661 else if (cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1662 || cs
->c_sclass
== C_THUMBEXTFUNC
)
1663 add_symbol_to_list (sym
, &global_symbols
);
1667 SYMBOL_TYPE (sym
) = decode_type (cs
, cs
->c_type
, aux
, objfile
);
1668 switch (cs
->c_sclass
)
1674 SYMBOL_ACLASS_INDEX (sym
) = LOC_LOCAL
;
1675 add_symbol_to_list (sym
, &local_symbols
);
1679 case C_THUMBEXTFUNC
:
1681 SYMBOL_ACLASS_INDEX (sym
) = LOC_STATIC
;
1682 SYMBOL_VALUE_ADDRESS (sym
) = (CORE_ADDR
) cs
->c_value
;
1683 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (objfile
->section_offsets
,
1684 SECT_OFF_TEXT (objfile
));
1685 add_symbol_to_list (sym
, &global_symbols
);
1689 case C_THUMBSTATFUNC
:
1691 SYMBOL_ACLASS_INDEX (sym
) = LOC_STATIC
;
1692 SYMBOL_VALUE_ADDRESS (sym
) = (CORE_ADDR
) cs
->c_value
;
1693 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (objfile
->section_offsets
,
1694 SECT_OFF_TEXT (objfile
));
1695 if (within_function
)
1697 /* Static symbol of local scope. */
1698 add_symbol_to_list (sym
, &local_symbols
);
1702 /* Static symbol at top level of file. */
1703 add_symbol_to_list (sym
, &file_symbols
);
1707 #ifdef C_GLBLREG /* AMD coff */
1711 SYMBOL_ACLASS_INDEX (sym
) = coff_register_index
;
1712 SYMBOL_VALUE (sym
) = cs
->c_value
;
1713 add_symbol_to_list (sym
, &local_symbols
);
1721 SYMBOL_ACLASS_INDEX (sym
) = LOC_ARG
;
1722 SYMBOL_IS_ARGUMENT (sym
) = 1;
1723 add_symbol_to_list (sym
, &local_symbols
);
1727 SYMBOL_ACLASS_INDEX (sym
) = coff_register_index
;
1728 SYMBOL_IS_ARGUMENT (sym
) = 1;
1729 SYMBOL_VALUE (sym
) = cs
->c_value
;
1730 add_symbol_to_list (sym
, &local_symbols
);
1734 SYMBOL_ACLASS_INDEX (sym
) = LOC_TYPEDEF
;
1735 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
1737 /* If type has no name, give it one. */
1738 if (TYPE_NAME (SYMBOL_TYPE (sym
)) == 0)
1740 if (TYPE_CODE (SYMBOL_TYPE (sym
)) == TYPE_CODE_PTR
1741 || TYPE_CODE (SYMBOL_TYPE (sym
)) == TYPE_CODE_FUNC
)
1743 /* If we are giving a name to a type such as
1744 "pointer to foo" or "function returning foo", we
1745 better not set the TYPE_NAME. If the program
1746 contains "typedef char *caddr_t;", we don't want
1747 all variables of type char * to print as caddr_t.
1748 This is not just a consequence of GDB's type
1749 management; CC and GCC (at least through version
1750 2.4) both output variables of either type char *
1751 or caddr_t with the type refering to the C_TPDEF
1752 symbol for caddr_t. If a future compiler cleans
1753 this up it GDB is not ready for it yet, but if it
1754 becomes ready we somehow need to disable this
1755 check (without breaking the PCC/GCC2.4 case).
1759 Fortunately, this check seems not to be necessary
1760 for anything except pointers or functions. */
1764 TYPE_NAME (SYMBOL_TYPE (sym
)) =
1765 xstrdup (SYMBOL_LINKAGE_NAME (sym
));
1768 /* Keep track of any type which points to empty structured
1769 type, so it can be filled from a definition from another
1770 file. A simple forward reference (TYPE_CODE_UNDEF) is
1771 not an empty structured type, though; the forward
1772 references work themselves out via the magic of
1773 coff_lookup_type. */
1774 if (TYPE_CODE (SYMBOL_TYPE (sym
)) == TYPE_CODE_PTR
1775 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym
))) == 0
1776 && TYPE_CODE (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym
)))
1779 int i
= hashname (SYMBOL_LINKAGE_NAME (sym
));
1781 SYMBOL_VALUE_CHAIN (sym
) = opaque_type_chain
[i
];
1782 opaque_type_chain
[i
] = sym
;
1784 add_symbol_to_list (sym
, &file_symbols
);
1790 SYMBOL_ACLASS_INDEX (sym
) = LOC_TYPEDEF
;
1791 SYMBOL_DOMAIN (sym
) = STRUCT_DOMAIN
;
1793 /* Some compilers try to be helpful by inventing "fake"
1794 names for anonymous enums, structures, and unions, like
1795 "~0fake" or ".0fake". Thanks, but no thanks... */
1796 if (TYPE_TAG_NAME (SYMBOL_TYPE (sym
)) == 0)
1797 if (SYMBOL_LINKAGE_NAME (sym
) != NULL
1798 && *SYMBOL_LINKAGE_NAME (sym
) != '~'
1799 && *SYMBOL_LINKAGE_NAME (sym
) != '.')
1800 TYPE_TAG_NAME (SYMBOL_TYPE (sym
)) =
1801 concat (SYMBOL_LINKAGE_NAME (sym
), (char *)NULL
);
1803 add_symbol_to_list (sym
, &file_symbols
);
1813 /* Decode a coff type specifier; return the type that is meant. */
1815 static struct type
*
1816 decode_type (struct coff_symbol
*cs
, unsigned int c_type
,
1817 union internal_auxent
*aux
, struct objfile
*objfile
)
1819 struct type
*type
= 0;
1820 unsigned int new_c_type
;
1822 if (c_type
& ~N_BTMASK
)
1824 new_c_type
= DECREF (c_type
);
1827 type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1828 type
= lookup_pointer_type (type
);
1830 else if (ISFCN (c_type
))
1832 type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1833 type
= lookup_function_type (type
);
1835 else if (ISARY (c_type
))
1838 unsigned short *dim
;
1839 struct type
*base_type
, *index_type
, *range_type
;
1841 /* Define an array type. */
1842 /* auxent refers to array, not base type. */
1843 if (aux
->x_sym
.x_tagndx
.l
== 0)
1846 /* Shift the indices down. */
1847 dim
= &aux
->x_sym
.x_fcnary
.x_ary
.x_dimen
[0];
1850 for (i
= 0; *dim
&& i
< DIMNUM
- 1; i
++, dim
++)
1854 base_type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1855 index_type
= objfile_type (objfile
)->builtin_int
;
1857 = create_static_range_type ((struct type
*) NULL
,
1858 index_type
, 0, n
- 1);
1860 create_array_type ((struct type
*) NULL
,
1861 base_type
, range_type
);
1866 /* Reference to existing type. This only occurs with the struct,
1867 union, and enum types. EPI a29k coff fakes us out by producing
1868 aux entries with a nonzero x_tagndx for definitions of structs,
1869 unions, and enums, so we have to check the c_sclass field. SCO
1870 3.2v4 cc gets confused with pointers to pointers to defined
1871 structs, and generates negative x_tagndx fields. */
1872 if (cs
->c_naux
> 0 && aux
->x_sym
.x_tagndx
.l
!= 0)
1874 if (cs
->c_sclass
!= C_STRTAG
1875 && cs
->c_sclass
!= C_UNTAG
1876 && cs
->c_sclass
!= C_ENTAG
1877 && aux
->x_sym
.x_tagndx
.l
>= 0)
1879 type
= coff_alloc_type (aux
->x_sym
.x_tagndx
.l
);
1884 complaint (&symfile_complaints
,
1885 _("Symbol table entry for %s has bad tagndx value"),
1887 /* And fall through to decode_base_type... */
1891 return decode_base_type (cs
, BTYPE (c_type
), aux
, objfile
);
1894 /* Decode a coff type specifier for function definition;
1895 return the type that the function returns. */
1897 static struct type
*
1898 decode_function_type (struct coff_symbol
*cs
,
1899 unsigned int c_type
,
1900 union internal_auxent
*aux
,
1901 struct objfile
*objfile
)
1903 if (aux
->x_sym
.x_tagndx
.l
== 0)
1904 cs
->c_naux
= 0; /* auxent refers to function, not base
1907 return decode_type (cs
, DECREF (c_type
), aux
, objfile
);
1910 /* Basic C types. */
1912 static struct type
*
1913 decode_base_type (struct coff_symbol
*cs
,
1914 unsigned int c_type
,
1915 union internal_auxent
*aux
,
1916 struct objfile
*objfile
)
1918 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
1924 /* Shows up with "void (*foo)();" structure members. */
1925 return objfile_type (objfile
)->builtin_void
;
1929 /* Intel 960 COFF has this symbol and meaning. */
1930 return objfile_type (objfile
)->builtin_void
;
1934 return objfile_type (objfile
)->builtin_char
;
1937 return objfile_type (objfile
)->builtin_short
;
1940 return objfile_type (objfile
)->builtin_int
;
1943 if (cs
->c_sclass
== C_FIELD
1944 && aux
->x_sym
.x_misc
.x_lnsz
.x_size
1945 > gdbarch_long_bit (gdbarch
))
1946 return objfile_type (objfile
)->builtin_long_long
;
1948 return objfile_type (objfile
)->builtin_long
;
1951 return objfile_type (objfile
)->builtin_float
;
1954 return objfile_type (objfile
)->builtin_double
;
1957 return objfile_type (objfile
)->builtin_long_double
;
1960 if (cs
->c_naux
!= 1)
1962 /* Anonymous structure type. */
1963 type
= coff_alloc_type (cs
->c_symnum
);
1964 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
1965 TYPE_NAME (type
) = NULL
;
1966 /* This used to set the tag to "<opaque>". But I think
1967 setting it to NULL is right, and the printing code can
1968 print it as "struct {...}". */
1969 TYPE_TAG_NAME (type
) = NULL
;
1970 INIT_CPLUS_SPECIFIC (type
);
1971 TYPE_LENGTH (type
) = 0;
1972 TYPE_FIELDS (type
) = 0;
1973 TYPE_NFIELDS (type
) = 0;
1977 type
= coff_read_struct_type (cs
->c_symnum
,
1978 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
1979 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
1985 if (cs
->c_naux
!= 1)
1987 /* Anonymous union type. */
1988 type
= coff_alloc_type (cs
->c_symnum
);
1989 TYPE_NAME (type
) = NULL
;
1990 /* This used to set the tag to "<opaque>". But I think
1991 setting it to NULL is right, and the printing code can
1992 print it as "union {...}". */
1993 TYPE_TAG_NAME (type
) = NULL
;
1994 INIT_CPLUS_SPECIFIC (type
);
1995 TYPE_LENGTH (type
) = 0;
1996 TYPE_FIELDS (type
) = 0;
1997 TYPE_NFIELDS (type
) = 0;
2001 type
= coff_read_struct_type (cs
->c_symnum
,
2002 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
2003 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
2006 TYPE_CODE (type
) = TYPE_CODE_UNION
;
2010 if (cs
->c_naux
!= 1)
2012 /* Anonymous enum type. */
2013 type
= coff_alloc_type (cs
->c_symnum
);
2014 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
2015 TYPE_NAME (type
) = NULL
;
2016 /* This used to set the tag to "<opaque>". But I think
2017 setting it to NULL is right, and the printing code can
2018 print it as "enum {...}". */
2019 TYPE_TAG_NAME (type
) = NULL
;
2020 TYPE_LENGTH (type
) = 0;
2021 TYPE_FIELDS (type
) = 0;
2022 TYPE_NFIELDS (type
) = 0;
2026 type
= coff_read_enum_type (cs
->c_symnum
,
2027 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
2028 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
2034 /* Shouldn't show up here. */
2038 return objfile_type (objfile
)->builtin_unsigned_char
;
2041 return objfile_type (objfile
)->builtin_unsigned_short
;
2044 return objfile_type (objfile
)->builtin_unsigned_int
;
2047 if (cs
->c_sclass
== C_FIELD
2048 && aux
->x_sym
.x_misc
.x_lnsz
.x_size
2049 > gdbarch_long_bit (gdbarch
))
2050 return objfile_type (objfile
)->builtin_unsigned_long_long
;
2052 return objfile_type (objfile
)->builtin_unsigned_long
;
2054 complaint (&symfile_complaints
,
2055 _("Unexpected type for symbol %s"), cs
->c_name
);
2056 return objfile_type (objfile
)->builtin_void
;
2059 /* This page contains subroutines of read_type. */
2061 /* Read the description of a structure (or union type) and return an
2062 object describing the type. */
2064 static struct type
*
2065 coff_read_struct_type (int index
, int length
, int lastsym
,
2066 struct objfile
*objfile
)
2070 struct nextfield
*next
;
2075 struct nextfield
*list
= 0;
2076 struct nextfield
*newobj
;
2080 struct coff_symbol member_sym
;
2081 struct coff_symbol
*ms
= &member_sym
;
2082 struct internal_syment sub_sym
;
2083 union internal_auxent sub_aux
;
2086 type
= coff_alloc_type (index
);
2087 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
2088 INIT_CPLUS_SPECIFIC (type
);
2089 TYPE_LENGTH (type
) = length
;
2091 while (!done
&& symnum
< lastsym
&& symnum
< nlist_nsyms_global
)
2093 read_one_sym (ms
, &sub_sym
, &sub_aux
);
2095 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
2097 switch (ms
->c_sclass
)
2102 /* Get space to record the next field's data. */
2103 newobj
= XALLOCA (struct nextfield
);
2104 newobj
->next
= list
;
2107 /* Save the data. */
2109 = (const char *) obstack_copy0 (&objfile
->objfile_obstack
,
2110 name
, strlen (name
));
2111 FIELD_TYPE (list
->field
) = decode_type (ms
, ms
->c_type
,
2113 SET_FIELD_BITPOS (list
->field
, 8 * ms
->c_value
);
2114 FIELD_BITSIZE (list
->field
) = 0;
2120 /* Get space to record the next field's data. */
2121 newobj
= XALLOCA (struct nextfield
);
2122 newobj
->next
= list
;
2125 /* Save the data. */
2127 = (const char *) obstack_copy0 (&objfile
->objfile_obstack
,
2128 name
, strlen (name
));
2129 FIELD_TYPE (list
->field
) = decode_type (ms
, ms
->c_type
,
2131 SET_FIELD_BITPOS (list
->field
, ms
->c_value
);
2132 FIELD_BITSIZE (list
->field
) = sub_aux
.x_sym
.x_misc
.x_lnsz
.x_size
;
2141 /* Now create the vector of fields, and record how big it is. */
2143 TYPE_NFIELDS (type
) = nfields
;
2144 TYPE_FIELDS (type
) = (struct field
*)
2145 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
2147 /* Copy the saved-up fields into the field vector. */
2149 for (n
= nfields
; list
; list
= list
->next
)
2150 TYPE_FIELD (type
, --n
) = list
->field
;
2155 /* Read a definition of an enumeration type,
2156 and create and return a suitable type object.
2157 Also defines the symbols that represent the values of the type. */
2159 static struct type
*
2160 coff_read_enum_type (int index
, int length
, int lastsym
,
2161 struct objfile
*objfile
)
2163 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
2168 struct pending
**symlist
;
2169 struct coff_symbol member_sym
;
2170 struct coff_symbol
*ms
= &member_sym
;
2171 struct internal_syment sub_sym
;
2172 union internal_auxent sub_aux
;
2173 struct pending
*osyms
, *syms
;
2177 int unsigned_enum
= 1;
2179 type
= coff_alloc_type (index
);
2180 if (within_function
)
2181 symlist
= &local_symbols
;
2183 symlist
= &file_symbols
;
2185 o_nsyms
= osyms
? osyms
->nsyms
: 0;
2187 while (!done
&& symnum
< lastsym
&& symnum
< nlist_nsyms_global
)
2189 read_one_sym (ms
, &sub_sym
, &sub_aux
);
2191 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
2193 switch (ms
->c_sclass
)
2196 sym
= allocate_symbol (objfile
);
2198 name
= (char *) obstack_copy0 (&objfile
->objfile_obstack
, name
,
2200 SYMBOL_SET_LINKAGE_NAME (sym
, name
);
2201 SYMBOL_ACLASS_INDEX (sym
) = LOC_CONST
;
2202 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
2203 SYMBOL_VALUE (sym
) = ms
->c_value
;
2204 add_symbol_to_list (sym
, symlist
);
2209 /* Sometimes the linker (on 386/ix 2.0.2 at least) screws
2210 up the count of how many symbols to read. So stop
2217 /* Now fill in the fields of the type-structure. */
2220 TYPE_LENGTH (type
) = length
;
2221 else /* Assume ints. */
2222 TYPE_LENGTH (type
) = gdbarch_int_bit (gdbarch
) / TARGET_CHAR_BIT
;
2223 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
2224 TYPE_NFIELDS (type
) = nsyms
;
2225 TYPE_FIELDS (type
) = (struct field
*)
2226 TYPE_ALLOC (type
, sizeof (struct field
) * nsyms
);
2228 /* Find the symbols for the values and put them into the type.
2229 The symbols can be found in the symlist that we put them on
2230 to cause them to be defined. osyms contains the old value
2231 of that symlist; everything up to there was defined by us. */
2232 /* Note that we preserve the order of the enum constants, so
2233 that in something like "enum {FOO, LAST_THING=FOO}" we print
2234 FOO, not LAST_THING. */
2236 for (syms
= *symlist
, n
= 0; syms
; syms
= syms
->next
)
2242 for (; j
< syms
->nsyms
; j
++, n
++)
2244 struct symbol
*xsym
= syms
->symbol
[j
];
2246 SYMBOL_TYPE (xsym
) = type
;
2247 TYPE_FIELD_NAME (type
, n
) = SYMBOL_LINKAGE_NAME (xsym
);
2248 SET_FIELD_ENUMVAL (TYPE_FIELD (type
, n
), SYMBOL_VALUE (xsym
));
2249 if (SYMBOL_VALUE (xsym
) < 0)
2251 TYPE_FIELD_BITSIZE (type
, n
) = 0;
2258 TYPE_UNSIGNED (type
) = 1;
2263 /* Register our ability to parse symbols for coff BFD files. */
2265 static const struct sym_fns coff_sym_fns
=
2267 coff_new_init
, /* sym_new_init: init anything gbl to
2269 coff_symfile_init
, /* sym_init: read initial info, setup
2271 coff_symfile_read
, /* sym_read: read a symbol file into
2273 NULL
, /* sym_read_psymbols */
2274 coff_symfile_finish
, /* sym_finish: finished with file,
2276 default_symfile_offsets
, /* sym_offsets: xlate external to
2278 default_symfile_segments
, /* sym_segments: Get segment
2279 information from a file */
2280 NULL
, /* sym_read_linetable */
2282 default_symfile_relocate
, /* sym_relocate: Relocate a debug
2284 NULL
, /* sym_probe_fns */
2288 /* Free the per-objfile COFF data. */
2291 coff_free_info (struct objfile
*objfile
, void *arg
)
2297 _initialize_coffread (void)
2299 add_symtab_fns (bfd_target_coff_flavour
, &coff_sym_fns
);
2301 coff_objfile_data_key
= register_objfile_data_with_cleanup (NULL
,
2305 = register_symbol_register_impl (LOC_REGISTER
, &coff_register_funcs
);