1 /* Read coff symbol tables and convert to internal format, for GDB.
2 Copyright (C) 1987-2018 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 /* Key for COFF-associated data. */
48 static const struct objfile_data
*coff_objfile_data_key
;
50 /* The objfile we are currently reading. */
52 static struct objfile
*coffread_objfile
;
54 struct coff_symfile_info
56 file_ptr min_lineno_offset
; /* Where in file lowest line#s are. */
57 file_ptr max_lineno_offset
; /* 1+last byte of line#s in file. */
59 CORE_ADDR textaddr
; /* Addr of .text section. */
60 unsigned int textsize
; /* Size of .text section. */
61 struct stab_section_list
*stabsects
; /* .stab sections. */
62 asection
*stabstrsect
; /* Section pointer for .stab section. */
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 extern void stabsread_clear_cache (void);
160 static struct type
*coff_read_struct_type (int, int, int,
163 static struct type
*decode_base_type (struct coff_symbol
*,
165 union internal_auxent
*,
168 static struct type
*decode_type (struct coff_symbol
*, unsigned int,
169 union internal_auxent
*,
172 static struct type
*decode_function_type (struct coff_symbol
*,
174 union internal_auxent
*,
177 static struct type
*coff_read_enum_type (int, int, int,
180 static struct symbol
*process_coff_symbol (struct coff_symbol
*,
181 union internal_auxent
*,
184 static void patch_opaque_types (struct symtab
*);
186 static void enter_linenos (long, int, int, struct objfile
*);
188 static void free_linetab (void);
190 static void free_linetab_cleanup (void *ignore
);
192 static int init_lineno (bfd
*, long, int);
194 static char *getsymname (struct internal_syment
*);
196 static const char *coff_getfilename (union internal_auxent
*);
198 static void free_stringtab (void);
200 static void free_stringtab_cleanup (void *ignore
);
202 static int init_stringtab (bfd
*, long);
204 static void read_one_sym (struct coff_symbol
*,
205 struct internal_syment
*,
206 union internal_auxent
*);
208 static void coff_symtab_read (minimal_symbol_reader
&,
209 long, unsigned int, struct objfile
*);
211 /* We are called once per section from coff_symfile_read. We
212 need to examine each section we are passed, check to see
213 if it is something we are interested in processing, and
214 if so, stash away some access information for the section.
216 FIXME: The section names should not be hardwired strings (what
217 should they be? I don't think most object file formats have enough
218 section flags to specify what kind of debug section it is
222 coff_locate_sections (bfd
*abfd
, asection
*sectp
, void *csip
)
224 struct coff_symfile_info
*csi
;
227 csi
= (struct coff_symfile_info
*) csip
;
228 name
= bfd_get_section_name (abfd
, sectp
);
229 if (strcmp (name
, ".text") == 0)
231 csi
->textaddr
= bfd_section_vma (abfd
, sectp
);
232 csi
->textsize
+= bfd_section_size (abfd
, sectp
);
234 else if (startswith (name
, ".text"))
236 csi
->textsize
+= bfd_section_size (abfd
, sectp
);
238 else if (strcmp (name
, ".stabstr") == 0)
240 csi
->stabstrsect
= sectp
;
242 else if (startswith (name
, ".stab"))
246 /* We can have multiple .stab sections if linked with
248 for (s
= name
+ sizeof ".stab" - 1; *s
!= '\0'; s
++)
253 struct stab_section_list
*n
, **pn
;
255 n
= XNEW (struct stab_section_list
);
258 for (pn
= &csi
->stabsects
; *pn
!= NULL
; pn
= &(*pn
)->next
)
262 /* This will be run after coffstab_build_psymtabs is called
263 in coff_symfile_read, at which point we no longer need
265 make_cleanup (xfree
, n
);
270 /* Return the section_offsets* that CS points to. */
271 static int cs_to_section (struct coff_symbol
*, struct objfile
*);
273 struct find_targ_sec_arg
280 find_targ_sec (bfd
*abfd
, asection
*sect
, void *obj
)
282 struct find_targ_sec_arg
*args
= (struct find_targ_sec_arg
*) obj
;
284 if (sect
->target_index
== args
->targ_index
)
285 *args
->resultp
= sect
;
288 /* Return the bfd_section that CS points to. */
289 static struct bfd_section
*
290 cs_to_bfd_section (struct coff_symbol
*cs
, struct objfile
*objfile
)
292 asection
*sect
= NULL
;
293 struct find_targ_sec_arg args
;
295 args
.targ_index
= cs
->c_secnum
;
296 args
.resultp
= §
;
297 bfd_map_over_sections (objfile
->obfd
, find_targ_sec
, &args
);
301 /* Return the section number (SECT_OFF_*) that CS points to. */
303 cs_to_section (struct coff_symbol
*cs
, struct objfile
*objfile
)
305 asection
*sect
= cs_to_bfd_section (cs
, objfile
);
308 return SECT_OFF_TEXT (objfile
);
309 return gdb_bfd_section_index (objfile
->obfd
, sect
);
312 /* Return the address of the section of a COFF symbol. */
314 static CORE_ADDR
cs_section_address (struct coff_symbol
*, bfd
*);
317 cs_section_address (struct coff_symbol
*cs
, bfd
*abfd
)
319 asection
*sect
= NULL
;
320 struct find_targ_sec_arg args
;
323 args
.targ_index
= cs
->c_secnum
;
324 args
.resultp
= §
;
325 bfd_map_over_sections (abfd
, find_targ_sec
, &args
);
327 addr
= bfd_get_section_vma (abfd
, sect
);
331 /* Look up a coff type-number index. Return the address of the slot
332 where the type for that index is stored.
333 The type-number is in INDEX.
335 This can be used for finding the type associated with that index
336 or for associating a new type with the index. */
338 static struct type
**
339 coff_lookup_type (int index
)
341 if (index
>= type_vector_length
)
343 int old_vector_length
= type_vector_length
;
345 type_vector_length
*= 2;
346 if (index
/* is still */ >= type_vector_length
)
347 type_vector_length
= index
* 2;
349 type_vector
= (struct type
**)
350 xrealloc ((char *) type_vector
,
351 type_vector_length
* sizeof (struct type
*));
352 memset (&type_vector
[old_vector_length
], 0,
353 (type_vector_length
- old_vector_length
) * sizeof (struct type
*));
355 return &type_vector
[index
];
358 /* Make sure there is a type allocated for type number index
359 and return the type object.
360 This can create an empty (zeroed) type object. */
363 coff_alloc_type (int index
)
365 struct type
**type_addr
= coff_lookup_type (index
);
366 struct type
*type
= *type_addr
;
368 /* If we are referring to a type not known at all yet,
369 allocate an empty type for it.
370 We will fill it in later if we find out how. */
373 type
= alloc_type (coffread_objfile
);
379 /* Start a new symtab for a new source file.
380 This is called when a COFF ".file" symbol is seen;
381 it indicates the start of data for one original source file. */
384 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 call
395 set_last_source_start_addr in coff_end_symtab. */
397 /* Let buildsym.c deduce the language for this symtab. */
399 record_debugformat ("COFF");
402 /* Save the vital information from when starting to read a file,
403 for use when closing off the current file.
404 NAME is the file name the symbols came from, START_ADDR is the
405 first text address for the file, and SIZE is the number of bytes of
409 complete_symtab (const char *name
, CORE_ADDR start_addr
, unsigned int size
)
411 set_last_source_file (name
);
412 current_source_start_addr
= start_addr
;
413 current_source_end_addr
= start_addr
+ size
;
416 /* Finish the symbol definitions for one main source file, close off
417 all the lexical contexts for that file (creating struct block's for
418 them), then make the struct symtab for that file and put it in the
422 coff_end_symtab (struct objfile
*objfile
)
424 set_last_source_start_addr (current_source_start_addr
);
426 end_symtab (current_source_end_addr
, SECT_OFF_TEXT (objfile
));
428 /* Reinitialize for beginning of new file. */
429 set_last_source_file (NULL
);
432 /* The linker sometimes generates some non-function symbols inside
433 functions referencing variables imported from another DLL.
434 Return nonzero if the given symbol corresponds to one of them. */
437 is_import_fixup_symbol (struct coff_symbol
*cs
,
438 enum minimal_symbol_type type
)
440 /* The following is a bit of a heuristic using the characterictics
441 of these fixup symbols, but should work well in practice... */
444 /* Must be a non-static text symbol. */
445 if (type
!= mst_text
)
448 /* Must be a non-function symbol. */
449 if (ISFCN (cs
->c_type
))
452 /* The name must start with "__fu<digits>__". */
453 if (!startswith (cs
->c_name
, "__fu"))
455 if (! isdigit (cs
->c_name
[4]))
457 for (i
= 5; cs
->c_name
[i
] != '\0' && isdigit (cs
->c_name
[i
]); i
++)
458 /* Nothing, just incrementing index past all digits. */;
459 if (cs
->c_name
[i
] != '_' || cs
->c_name
[i
+ 1] != '_')
465 static struct minimal_symbol
*
466 record_minimal_symbol (minimal_symbol_reader
&reader
,
467 struct coff_symbol
*cs
, CORE_ADDR address
,
468 enum minimal_symbol_type type
, int section
,
469 struct objfile
*objfile
)
471 /* We don't want TDESC entry points in the minimal symbol table. */
472 if (cs
->c_name
[0] == '@')
475 if (is_import_fixup_symbol (cs
, type
))
477 /* Because the value of these symbols is within a function code
478 range, these symbols interfere with the symbol-from-address
479 reverse lookup; this manifests itselfs in backtraces, or any
480 other commands that prints symbolic addresses. Just pretend
481 these symbols do not exist. */
485 return reader
.record_with_info (cs
->c_name
, address
, type
, section
);
488 /* coff_symfile_init ()
489 is the coff-specific initialization routine for reading symbols.
490 It is passed a struct objfile which contains, among other things,
491 the BFD for the file whose symbols are being read, and a slot for
492 a pointer to "private data" which we fill with cookies and other
493 treats for coff_symfile_read ().
495 We will only be called if this is a COFF or COFF-like file. BFD
496 handles figuring out the format of the file, and code in symtab.c
497 uses BFD's determination to vector to us.
499 The ultimate result is a new symtab (or, FIXME, eventually a
503 coff_symfile_init (struct objfile
*objfile
)
505 struct dbx_symfile_info
*dbx
;
506 struct coff_symfile_info
*coff
;
508 /* Allocate struct to keep track of stab reading. */
509 dbx
= XCNEW (struct dbx_symfile_info
);
510 set_objfile_data (objfile
, dbx_objfile_data_key
, dbx
);
512 /* Allocate struct to keep track of the symfile. */
513 coff
= XCNEW (struct coff_symfile_info
);
514 set_objfile_data (objfile
, coff_objfile_data_key
, coff
);
516 /* COFF objects may be reordered, so set OBJF_REORDERED. If we
517 find this causes a significant slowdown in gdb then we could
518 set it in the debug symbol readers only when necessary. */
519 objfile
->flags
|= OBJF_REORDERED
;
522 /* This function is called for every section; it finds the outer
523 limits of the line table (minimum and maximum file offset) so that
524 the mainline code can read the whole thing for efficiency. */
527 find_linenos (bfd
*abfd
, struct bfd_section
*asect
, void *vpinfo
)
529 struct coff_symfile_info
*info
;
531 file_ptr offset
, maxoff
;
533 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
534 count
= asect
->lineno_count
;
535 /* End of warning. */
539 size
= count
* local_linesz
;
541 info
= (struct coff_symfile_info
*) vpinfo
;
542 /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */
543 offset
= asect
->line_filepos
;
544 /* End of warning. */
546 if (offset
< info
->min_lineno_offset
|| info
->min_lineno_offset
== 0)
547 info
->min_lineno_offset
= offset
;
549 maxoff
= offset
+ size
;
550 if (maxoff
> info
->max_lineno_offset
)
551 info
->max_lineno_offset
= maxoff
;
555 /* The BFD for this file -- only good while we're actively reading
556 symbols into a psymtab or a symtab. */
558 static bfd
*symfile_bfd
;
560 /* Read a symbol file, after initialization by coff_symfile_init. */
563 coff_symfile_read (struct objfile
*objfile
, symfile_add_flags symfile_flags
)
565 struct coff_symfile_info
*info
;
566 bfd
*abfd
= objfile
->obfd
;
567 coff_data_type
*cdata
= coff_data (abfd
);
568 char *name
= bfd_get_filename (abfd
);
570 unsigned int num_symbols
;
572 int stringtab_offset
;
573 struct cleanup
*back_to
;
576 info
= (struct coff_symfile_info
*) objfile_data (objfile
,
577 coff_objfile_data_key
);
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 minimal_symbol_reader
reader (objfile
);
652 /* Now that the executable file is positioned at symbol table,
653 process it and define symbols accordingly. */
655 coff_symtab_read (reader
, (long) symtab_offset
, num_symbols
, objfile
);
657 /* Install any minimal symbols that have been collected as the
658 current minimal symbols for this objfile. */
664 struct minimal_symbol
*msym
;
666 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
668 const char *name
= MSYMBOL_LINKAGE_NAME (msym
);
670 /* If the minimal symbols whose name are prefixed by "__imp_"
671 or "_imp_", get rid of the prefix, and search the minimal
672 symbol in OBJFILE. Note that 'maintenance print msymbols'
673 shows that type of these "_imp_XXXX" symbols is mst_data. */
674 if (MSYMBOL_TYPE (msym
) == mst_data
)
676 const char *name1
= NULL
;
678 if (startswith (name
, "_imp_"))
680 else if (startswith (name
, "__imp_"))
684 int lead
= bfd_get_symbol_leading_char (objfile
->obfd
);
685 struct bound_minimal_symbol found
;
687 if (lead
!= '\0' && *name1
== lead
)
690 found
= lookup_minimal_symbol (name1
, NULL
, objfile
);
692 /* If found, there are symbols named "_imp_foo" and "foo"
693 respectively in OBJFILE. Set the type of symbol "foo"
694 as 'mst_solib_trampoline'. */
695 if (found
.minsym
!= NULL
696 && MSYMBOL_TYPE (found
.minsym
) == mst_text
)
697 MSYMBOL_TYPE (found
.minsym
) = mst_solib_trampoline
;
703 if (!(objfile
->flags
& OBJF_READNEVER
))
704 bfd_map_over_sections (abfd
, coff_locate_sections
, (void *) info
);
708 if (!info
->stabstrsect
)
710 error (_("The debugging information in `%s' is corrupted.\nThe "
711 "file has a `.stabs' section, but no `.stabstr' section."),
715 /* FIXME: dubious. Why can't we use something normal like
716 bfd_get_section_contents? */
717 bfd_seek (abfd
, abfd
->where
, 0);
719 stabstrsize
= bfd_section_size (abfd
, info
->stabstrsect
);
721 coffstab_build_psymtabs (objfile
,
722 info
->textaddr
, info
->textsize
,
724 info
->stabstrsect
->filepos
, stabstrsize
);
726 if (dwarf2_has_info (objfile
, NULL
))
728 /* DWARF2 sections. */
729 dwarf2_build_psymtabs (objfile
);
732 dwarf2_build_frame_info (objfile
);
734 /* Try to add separate debug file if no symbols table found. */
735 if (!objfile_has_partial_symbols (objfile
))
737 std::string debugfile
= find_separate_debug_file_by_buildid (objfile
);
739 if (debugfile
.empty ())
740 debugfile
= find_separate_debug_file_by_debuglink (objfile
);
742 if (!debugfile
.empty ())
744 gdb_bfd_ref_ptr
abfd (symfile_bfd_open (debugfile
.c_str ()));
746 symbol_file_add_separate (abfd
.get (), debugfile
.c_str (),
747 symfile_flags
, objfile
);
751 do_cleanups (back_to
);
755 coff_new_init (struct objfile
*ignore
)
759 /* Perform any local cleanups required when we are done with a
760 particular objfile. I.E, we are in the process of discarding all
761 symbol information for an objfile, freeing up all memory held for
762 it, and unlinking the objfile struct from the global list of known
766 coff_symfile_finish (struct objfile
*objfile
)
768 /* Let stabs reader clean up. */
769 stabsread_clear_cache ();
773 /* Given pointers to a symbol table in coff style exec file,
774 analyze them and create struct symtab's describing the symbols.
775 NSYMS is the number of symbols in the symbol table.
776 We read them one at a time using read_one_sym (). */
779 coff_symtab_read (minimal_symbol_reader
&reader
,
780 long symtab_offset
, unsigned int nsyms
,
781 struct objfile
*objfile
)
783 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
784 struct context_stack
*newobj
;
785 struct coff_symbol coff_symbol
;
786 struct coff_symbol
*cs
= &coff_symbol
;
787 static struct internal_syment main_sym
;
788 static union internal_auxent main_aux
;
789 struct coff_symbol fcn_cs_saved
;
790 static struct internal_syment fcn_sym_saved
;
791 static union internal_auxent fcn_aux_saved
;
792 /* A .file is open. */
793 int in_source_file
= 0;
794 int next_file_symnum
= -1;
795 /* Name of the current file. */
796 const char *filestring
= "";
798 int fcn_first_line
= 0;
799 CORE_ADDR fcn_first_line_addr
= 0;
800 int fcn_last_line
= 0;
801 int fcn_start_addr
= 0;
802 long fcn_line_ptr
= 0;
805 struct minimal_symbol
*msym
;
808 scoped_free_pendings free_pending
;
810 /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous....
811 it's hard to know I've really worked around it. The fix should
812 be harmless, anyway). The symptom of the bug is that the first
813 fread (in read_one_sym), will (in my example) actually get data
814 from file offset 268, when the fseek was to 264 (and ftell shows
815 264). This causes all hell to break loose. I was unable to
816 reproduce this on a short test program which operated on the same
817 file, performing (I think) the same sequence of operations.
819 It stopped happening when I put in this (former) rewind().
821 FIXME: Find out if this has been reported to Sun, whether it has
822 been fixed in a later release, etc. */
824 bfd_seek (objfile
->obfd
, 0, 0);
826 /* Position to read the symbol table. */
827 val
= bfd_seek (objfile
->obfd
, (long) symtab_offset
, 0);
829 perror_with_name (objfile_name (objfile
));
831 coffread_objfile
= objfile
;
832 nlist_bfd_global
= objfile
->obfd
;
833 nlist_nsyms_global
= nsyms
;
834 set_last_source_file (NULL
);
835 memset (opaque_type_chain
, 0, sizeof opaque_type_chain
);
837 if (type_vector
) /* Get rid of previous one. */
839 type_vector_length
= INITIAL_TYPE_VECTOR_LENGTH
;
840 type_vector
= XCNEWVEC (struct type
*, type_vector_length
);
842 coff_start_symtab (objfile
, "");
845 while (symnum
< nsyms
)
847 QUIT
; /* Make this command interruptable. */
849 read_one_sym (cs
, &main_sym
, &main_aux
);
851 if (cs
->c_symnum
== next_file_symnum
&& cs
->c_sclass
!= C_FILE
)
853 if (get_last_source_file ())
854 coff_end_symtab (objfile
);
856 coff_start_symtab (objfile
, "_globals_");
857 /* coff_start_symtab will set the language of this symtab to
858 language_unknown, since such a ``file name'' is not
859 recognized. Override that with the minimal language to
860 allow printing values in this symtab. */
861 get_current_subfile ()->language
= language_minimal
;
862 complete_symtab ("_globals_", 0, 0);
863 /* Done with all files, everything from here on out is
867 /* Special case for file with type declarations only, no
869 if (!get_last_source_file () && SDB_TYPE (cs
->c_type
)
870 && cs
->c_secnum
== N_DEBUG
)
871 complete_symtab (filestring
, 0, 0);
873 /* Typedefs should not be treated as symbol definitions. */
874 if (ISFCN (cs
->c_type
) && cs
->c_sclass
!= C_TPDEF
)
876 /* Record all functions -- external and static -- in
878 int section
= cs_to_section (cs
, objfile
);
880 tmpaddr
= cs
->c_value
;
881 record_minimal_symbol (reader
, cs
, tmpaddr
, mst_text
,
884 fcn_line_ptr
= main_aux
.x_sym
.x_fcnary
.x_fcn
.x_lnnoptr
;
885 fcn_start_addr
= tmpaddr
;
887 fcn_sym_saved
= main_sym
;
888 fcn_aux_saved
= main_aux
;
892 switch (cs
->c_sclass
)
901 complaint (_("Bad n_sclass for symbol %s"),
906 /* c_value field contains symnum of next .file entry in
907 table or symnum of first global after last .file. */
908 next_file_symnum
= cs
->c_value
;
910 filestring
= coff_getfilename (&main_aux
);
914 /* Complete symbol table for last object file
915 containing debugging information. */
916 if (get_last_source_file ())
918 coff_end_symtab (objfile
);
919 coff_start_symtab (objfile
, filestring
);
924 /* C_LABEL is used for labels and static functions.
925 Including it here allows gdb to see static functions when
926 no debug info is available. */
928 /* However, labels within a function can make weird
929 backtraces, so filter them out (from phdm@macqel.be). */
936 case C_THUMBSTATFUNC
:
937 if (cs
->c_name
[0] == '.')
939 if (strcmp (cs
->c_name
, ".text") == 0)
941 /* FIXME: don't wire in ".text" as section name or
943 /* Check for in_source_file deals with case of a
944 file with debugging symbols followed by a later
945 file with no symbols. */
947 complete_symtab (filestring
,
948 cs
->c_value
+ ANOFFSET (objfile
->section_offsets
,
949 SECT_OFF_TEXT (objfile
)),
950 main_aux
.x_scn
.x_scnlen
);
953 /* Flush rest of '.' symbols. */
956 else if (!SDB_TYPE (cs
->c_type
)
957 && cs
->c_name
[0] == 'L'
958 && (startswith (cs
->c_name
, "LI%")
959 || startswith (cs
->c_name
, "LF%")
960 || startswith (cs
->c_name
, "LC%")
961 || startswith (cs
->c_name
, "LP%")
962 || startswith (cs
->c_name
, "LPB%")
963 || startswith (cs
->c_name
, "LBB%")
964 || startswith (cs
->c_name
, "LBE%")
965 || startswith (cs
->c_name
, "LPBX%")))
966 /* At least on a 3b1, gcc generates swbeg and string labels
967 that look like this. Ignore them. */
969 /* For static symbols that don't start with '.'... */
975 /* Record it in the minimal symbols regardless of
976 SDB_TYPE. This parallels what we do for other debug
977 formats, and probably is needed to make
978 print_address_symbolic work right without the (now
979 gone) "set fast-symbolic-addr off" kludge. */
981 enum minimal_symbol_type ms_type
;
983 CORE_ADDR offset
= 0;
985 if (cs
->c_secnum
== N_UNDEF
)
987 /* This is a common symbol. We used to rely on
988 the target to tell us whether it knows where
989 the symbol has been relocated to, but none of
990 the target implementations actually provided
991 that operation. So we just ignore the symbol,
992 the same way we would do if we had a target-side
993 symbol lookup which returned no match. */
996 else if (cs
->c_secnum
== N_ABS
)
998 /* Use the correct minimal symbol type (and don't
999 relocate) for absolute values. */
1001 sec
= cs_to_section (cs
, objfile
);
1002 tmpaddr
= cs
->c_value
;
1006 asection
*bfd_section
= cs_to_bfd_section (cs
, objfile
);
1008 sec
= cs_to_section (cs
, objfile
);
1009 tmpaddr
= cs
->c_value
;
1010 /* Statics in a PE file also get relocated. */
1011 if (cs
->c_sclass
== C_EXT
1012 || cs
->c_sclass
== C_THUMBEXTFUNC
1013 || cs
->c_sclass
== C_THUMBEXT
1014 || (pe_file
&& (cs
->c_sclass
== C_STAT
)))
1015 offset
= ANOFFSET (objfile
->section_offsets
, sec
);
1017 if (bfd_section
->flags
& SEC_CODE
)
1020 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXTFUNC
1021 || cs
->c_sclass
== C_THUMBEXT
?
1022 mst_text
: mst_file_text
;
1023 tmpaddr
= gdbarch_addr_bits_remove (gdbarch
, tmpaddr
);
1025 else if (bfd_section
->flags
& SEC_ALLOC
1026 && bfd_section
->flags
& SEC_LOAD
)
1029 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1030 ? mst_data
: mst_file_data
;
1032 else if (bfd_section
->flags
& SEC_ALLOC
)
1035 cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1036 ? mst_bss
: mst_file_bss
;
1039 ms_type
= mst_unknown
;
1042 msym
= record_minimal_symbol (reader
, cs
, tmpaddr
, ms_type
,
1045 gdbarch_coff_make_msymbol_special (gdbarch
,
1046 cs
->c_sclass
, msym
);
1048 if (SDB_TYPE (cs
->c_type
))
1052 sym
= process_coff_symbol
1053 (cs
, &main_aux
, objfile
);
1054 SYMBOL_VALUE (sym
) = tmpaddr
+ offset
;
1055 SYMBOL_SECTION (sym
) = sec
;
1061 if (strcmp (cs
->c_name
, ".bf") == 0)
1063 within_function
= 1;
1065 /* Value contains address of first non-init type
1067 /* main_aux.x_sym.x_misc.x_lnsz.x_lnno
1068 contains line number of '{' }. */
1069 if (cs
->c_naux
!= 1)
1070 complaint (_("`.bf' symbol %d has no aux entry"),
1072 fcn_first_line
= main_aux
.x_sym
.x_misc
.x_lnsz
.x_lnno
;
1073 fcn_first_line_addr
= cs
->c_value
;
1075 /* Might want to check that locals are 0 and
1076 context_stack_depth is zero, and complain if not. */
1079 newobj
= push_context (depth
, fcn_start_addr
);
1080 fcn_cs_saved
.c_name
= getsymname (&fcn_sym_saved
);
1082 process_coff_symbol (&fcn_cs_saved
,
1083 &fcn_aux_saved
, objfile
);
1085 else if (strcmp (cs
->c_name
, ".ef") == 0)
1087 if (!within_function
)
1088 error (_("Bad coff function information."));
1089 /* The value of .ef is the address of epilogue code;
1090 not useful for gdb. */
1091 /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno
1092 contains number of lines to '}' */
1094 if (outermost_context_p ())
1095 { /* We attempted to pop an empty context stack. */
1096 complaint (_("`.ef' symbol without matching `.bf' "
1097 "symbol ignored starting at symnum %d"),
1099 within_function
= 0;
1103 struct context_stack cstk
= pop_context ();
1104 /* Stack must be empty now. */
1105 if (!outermost_context_p () || newobj
== NULL
)
1107 complaint (_("Unmatched .ef symbol(s) ignored "
1108 "starting at symnum %d"),
1110 within_function
= 0;
1113 if (cs
->c_naux
!= 1)
1115 complaint (_("`.ef' symbol %d has no aux entry"),
1117 fcn_last_line
= 0x7FFFFFFF;
1121 fcn_last_line
= main_aux
.x_sym
.x_misc
.x_lnsz
.x_lnno
;
1123 /* fcn_first_line is the line number of the opening '{'.
1124 Do not record it - because it would affect gdb's idea
1125 of the line number of the first statement of the
1126 function - except for one-line functions, for which
1127 it is also the line number of all the statements and
1128 of the closing '}', and for which we do not have any
1129 other statement-line-number. */
1130 if (fcn_last_line
== 1)
1131 record_line (get_current_subfile (), fcn_first_line
,
1132 gdbarch_addr_bits_remove (gdbarch
,
1133 fcn_first_line_addr
));
1135 enter_linenos (fcn_line_ptr
, fcn_first_line
,
1136 fcn_last_line
, objfile
);
1138 finish_block (cstk
.name
, &local_symbols
, cstk
.old_blocks
,
1139 NULL
, cstk
.start_addr
,
1140 fcn_cs_saved
.c_value
1141 + fcn_aux_saved
.x_sym
.x_misc
.x_fsize
1142 + ANOFFSET (objfile
->section_offsets
,
1143 SECT_OFF_TEXT (objfile
)));
1144 within_function
= 0;
1149 if (strcmp (cs
->c_name
, ".bb") == 0)
1151 tmpaddr
= cs
->c_value
;
1152 tmpaddr
+= ANOFFSET (objfile
->section_offsets
,
1153 SECT_OFF_TEXT (objfile
));
1154 push_context (++depth
, tmpaddr
);
1156 else if (strcmp (cs
->c_name
, ".eb") == 0)
1158 if (outermost_context_p ())
1159 { /* We attempted to pop an empty context stack. */
1160 complaint (_("`.eb' symbol without matching `.bb' "
1161 "symbol ignored starting at symnum %d"),
1166 struct context_stack cstk
= pop_context ();
1167 if (depth
-- != cstk
.depth
)
1169 complaint (_("Mismatched .eb symbol ignored "
1170 "starting at symnum %d"),
1174 if (local_symbols
&& !outermost_context_p ())
1177 cs
->c_value
+ ANOFFSET (objfile
->section_offsets
,
1178 SECT_OFF_TEXT (objfile
));
1179 /* Make a block for the local symbols within. */
1180 finish_block (0, &local_symbols
, cstk
.old_blocks
, NULL
,
1181 cstk
.start_addr
, tmpaddr
);
1183 /* Now pop locals of block just finished. */
1184 local_symbols
= cstk
.locals
;
1189 process_coff_symbol (cs
, &main_aux
, objfile
);
1194 if ((nsyms
== 0) && (pe_file
))
1196 /* We've got no debugging symbols, but it's a portable
1197 executable, so try to read the export table. */
1198 read_pe_exported_syms (reader
, objfile
);
1201 if (get_last_source_file ())
1202 coff_end_symtab (objfile
);
1204 /* Patch up any opaque types (references to types that are not defined
1205 in the file where they are referenced, e.g. "struct foo *bar"). */
1207 struct compunit_symtab
*cu
;
1210 ALL_OBJFILE_FILETABS (objfile
, cu
, s
)
1211 patch_opaque_types (s
);
1214 coffread_objfile
= NULL
;
1217 /* Routines for reading headers and symbols from executable. */
1219 /* Read the next symbol, swap it, and return it in both
1220 internal_syment form, and coff_symbol form. Also return its first
1221 auxent, if any, in internal_auxent form, and skip any other
1225 read_one_sym (struct coff_symbol
*cs
,
1226 struct internal_syment
*sym
,
1227 union internal_auxent
*aux
)
1230 bfd_size_type bytes
;
1232 cs
->c_symnum
= symnum
;
1233 bytes
= bfd_bread (temp_sym
, local_symesz
, nlist_bfd_global
);
1234 if (bytes
!= local_symesz
)
1235 error (_("%s: error reading symbols"), objfile_name (coffread_objfile
));
1236 bfd_coff_swap_sym_in (symfile_bfd
, temp_sym
, (char *) sym
);
1237 cs
->c_naux
= sym
->n_numaux
& 0xff;
1238 if (cs
->c_naux
>= 1)
1240 bytes
= bfd_bread (temp_aux
, local_auxesz
, nlist_bfd_global
);
1241 if (bytes
!= local_auxesz
)
1242 error (_("%s: error reading symbols"), objfile_name (coffread_objfile
));
1243 bfd_coff_swap_aux_in (symfile_bfd
, temp_aux
,
1244 sym
->n_type
, sym
->n_sclass
,
1245 0, cs
->c_naux
, (char *) aux
);
1246 /* If more than one aux entry, read past it (only the first aux
1248 for (i
= 1; i
< cs
->c_naux
; i
++)
1250 bytes
= bfd_bread (temp_aux
, local_auxesz
, nlist_bfd_global
);
1251 if (bytes
!= local_auxesz
)
1252 error (_("%s: error reading symbols"),
1253 objfile_name (coffread_objfile
));
1256 cs
->c_name
= getsymname (sym
);
1257 cs
->c_value
= sym
->n_value
;
1258 cs
->c_sclass
= (sym
->n_sclass
& 0xff);
1259 cs
->c_secnum
= sym
->n_scnum
;
1260 cs
->c_type
= (unsigned) sym
->n_type
;
1261 if (!SDB_TYPE (cs
->c_type
))
1265 if (cs
->c_sclass
& 128)
1266 printf (_("thumb symbol %s, class 0x%x\n"), cs
->c_name
, cs
->c_sclass
);
1269 symnum
+= 1 + cs
->c_naux
;
1271 /* The PE file format stores symbol values as offsets within the
1272 section, rather than as absolute addresses. We correct that
1273 here, if the symbol has an appropriate storage class. FIXME: We
1274 should use BFD to read the symbols, rather than duplicating the
1278 switch (cs
->c_sclass
)
1282 case C_THUMBEXTFUNC
:
1287 case C_THUMBSTATFUNC
:
1293 if (cs
->c_secnum
!= 0)
1294 cs
->c_value
+= cs_section_address (cs
, symfile_bfd
);
1300 /* Support for string table handling. */
1302 static char *stringtab
= NULL
;
1305 init_stringtab (bfd
*abfd
, long offset
)
1309 unsigned char lengthbuf
[4];
1313 /* If the file is stripped, the offset might be zero, indicating no
1314 string table. Just return with `stringtab' set to null. */
1318 if (bfd_seek (abfd
, offset
, 0) < 0)
1321 val
= bfd_bread ((char *) lengthbuf
, sizeof lengthbuf
, abfd
);
1322 length
= bfd_h_get_32 (symfile_bfd
, lengthbuf
);
1324 /* If no string table is needed, then the file may end immediately
1325 after the symbols. Just return with `stringtab' set to null. */
1326 if (val
!= sizeof lengthbuf
|| length
< sizeof lengthbuf
)
1329 stringtab
= (char *) xmalloc (length
);
1330 /* This is in target format (probably not very useful, and not
1331 currently used), not host format. */
1332 memcpy (stringtab
, lengthbuf
, sizeof lengthbuf
);
1333 if (length
== sizeof length
) /* Empty table -- just the count. */
1336 val
= bfd_bread (stringtab
+ sizeof lengthbuf
,
1337 length
- sizeof lengthbuf
, abfd
);
1338 if (val
!= length
- sizeof lengthbuf
|| stringtab
[length
- 1] != '\0')
1345 free_stringtab (void)
1353 free_stringtab_cleanup (void *ignore
)
1359 getsymname (struct internal_syment
*symbol_entry
)
1361 static char buffer
[SYMNMLEN
+ 1];
1364 if (symbol_entry
->_n
._n_n
._n_zeroes
== 0)
1366 /* FIXME: Probably should be detecting corrupt symbol files by
1367 seeing whether offset points to within the stringtab. */
1368 result
= stringtab
+ symbol_entry
->_n
._n_n
._n_offset
;
1372 strncpy (buffer
, symbol_entry
->_n
._n_name
, SYMNMLEN
);
1373 buffer
[SYMNMLEN
] = '\0';
1379 /* Extract the file name from the aux entry of a C_FILE symbol.
1380 Return only the last component of the name. Result is in static
1381 storage and is only good for temporary use. */
1384 coff_getfilename (union internal_auxent
*aux_entry
)
1386 static char buffer
[BUFSIZ
];
1389 if (aux_entry
->x_file
.x_n
.x_zeroes
== 0)
1391 if (strlen (stringtab
+ aux_entry
->x_file
.x_n
.x_offset
) >= BUFSIZ
)
1392 internal_error (__FILE__
, __LINE__
, _("coff file name too long"));
1393 strcpy (buffer
, stringtab
+ aux_entry
->x_file
.x_n
.x_offset
);
1397 strncpy (buffer
, aux_entry
->x_file
.x_fname
, FILNMLEN
);
1398 buffer
[FILNMLEN
] = '\0';
1402 /* FIXME: We should not be throwing away the information about what
1403 directory. It should go into dirname of the symtab, or some such
1405 result
= lbasename (result
);
1409 /* Support for line number handling. */
1411 static char *linetab
= NULL
;
1412 static long linetab_offset
;
1413 static unsigned long linetab_size
;
1415 /* Read in all the line numbers for fast lookups later. Leave them in
1416 external (unswapped) format in memory; we'll swap them as we enter
1417 them into GDB's data structures. */
1420 init_lineno (bfd
*abfd
, long offset
, int size
)
1424 linetab_offset
= offset
;
1425 linetab_size
= size
;
1432 if (bfd_seek (abfd
, offset
, 0) < 0)
1435 /* Allocate the desired table, plus a sentinel. */
1436 linetab
= (char *) xmalloc (size
+ local_linesz
);
1438 val
= bfd_bread (linetab
, size
, abfd
);
1442 /* Terminate it with an all-zero sentinel record. */
1443 memset (linetab
+ size
, 0, local_linesz
);
1457 free_linetab_cleanup (void *ignore
)
1462 #if !defined (L_LNNO32)
1463 #define L_LNNO32(lp) ((lp)->l_lnno)
1467 enter_linenos (long file_offset
, int first_line
,
1468 int last_line
, struct objfile
*objfile
)
1470 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
1472 struct internal_lineno lptr
;
1476 if (file_offset
< linetab_offset
)
1478 complaint (_("Line number pointer %ld lower than start of line numbers"),
1480 if (file_offset
> linetab_size
) /* Too big to be an offset? */
1482 file_offset
+= linetab_offset
; /* Try reading at that linetab
1486 rawptr
= &linetab
[file_offset
- linetab_offset
];
1488 /* Skip first line entry for each function. */
1489 rawptr
+= local_linesz
;
1490 /* Line numbers start at one for the first line of the function. */
1493 /* If the line number table is full (e.g. 64K lines in COFF debug
1494 info), the next function's L_LNNO32 might not be zero, so don't
1495 overstep the table's end in any case. */
1496 while (rawptr
<= &linetab
[0] + linetab_size
)
1498 bfd_coff_swap_lineno_in (symfile_bfd
, rawptr
, &lptr
);
1499 rawptr
+= local_linesz
;
1500 /* The next function, or the sentinel, will have L_LNNO32 zero;
1502 if (L_LNNO32 (&lptr
) && L_LNNO32 (&lptr
) <= last_line
)
1504 CORE_ADDR addr
= lptr
.l_addr
.l_paddr
;
1505 addr
+= ANOFFSET (objfile
->section_offsets
,
1506 SECT_OFF_TEXT (objfile
));
1507 record_line (get_current_subfile (),
1508 first_line
+ L_LNNO32 (&lptr
),
1509 gdbarch_addr_bits_remove (gdbarch
, addr
));
1517 patch_type (struct type
*type
, struct type
*real_type
)
1519 struct type
*target
= TYPE_TARGET_TYPE (type
);
1520 struct type
*real_target
= TYPE_TARGET_TYPE (real_type
);
1521 int field_size
= TYPE_NFIELDS (real_target
) * sizeof (struct field
);
1523 TYPE_LENGTH (target
) = TYPE_LENGTH (real_target
);
1524 TYPE_NFIELDS (target
) = TYPE_NFIELDS (real_target
);
1525 TYPE_FIELDS (target
) = (struct field
*) TYPE_ALLOC (target
,
1528 memcpy (TYPE_FIELDS (target
),
1529 TYPE_FIELDS (real_target
),
1532 if (TYPE_NAME (real_target
))
1534 /* The previous copy of TYPE_NAME is allocated by
1535 process_coff_symbol. */
1536 if (TYPE_NAME (target
))
1537 xfree ((char*) TYPE_NAME (target
));
1538 TYPE_NAME (target
) = xstrdup (TYPE_NAME (real_target
));
1542 /* Patch up all appropriate typedef symbols in the opaque_type_chains
1543 so that they can be used to print out opaque data structures
1547 patch_opaque_types (struct symtab
*s
)
1550 struct block_iterator iter
;
1551 struct symbol
*real_sym
;
1553 /* Go through the per-file symbols only. */
1554 b
= BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (s
), STATIC_BLOCK
);
1555 ALL_BLOCK_SYMBOLS (b
, iter
, real_sym
)
1557 /* Find completed typedefs to use to fix opaque ones.
1558 Remove syms from the chain when their types are stored,
1559 but search the whole chain, as there may be several syms
1560 from different files with the same name. */
1561 if (SYMBOL_CLASS (real_sym
) == LOC_TYPEDEF
1562 && SYMBOL_DOMAIN (real_sym
) == VAR_DOMAIN
1563 && TYPE_CODE (SYMBOL_TYPE (real_sym
)) == TYPE_CODE_PTR
1564 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym
))) != 0)
1566 const char *name
= SYMBOL_LINKAGE_NAME (real_sym
);
1567 int hash
= hashname (name
);
1568 struct symbol
*sym
, *prev
;
1571 for (sym
= opaque_type_chain
[hash
]; sym
;)
1573 if (name
[0] == SYMBOL_LINKAGE_NAME (sym
)[0]
1574 && strcmp (name
+ 1, SYMBOL_LINKAGE_NAME (sym
) + 1) == 0)
1578 SYMBOL_VALUE_CHAIN (prev
) = SYMBOL_VALUE_CHAIN (sym
);
1582 opaque_type_chain
[hash
] = SYMBOL_VALUE_CHAIN (sym
);
1585 patch_type (SYMBOL_TYPE (sym
), SYMBOL_TYPE (real_sym
));
1589 sym
= SYMBOL_VALUE_CHAIN (prev
);
1593 sym
= opaque_type_chain
[hash
];
1599 sym
= SYMBOL_VALUE_CHAIN (sym
);
1607 coff_reg_to_regnum (struct symbol
*sym
, struct gdbarch
*gdbarch
)
1609 return gdbarch_sdb_reg_to_regnum (gdbarch
, SYMBOL_VALUE (sym
));
1612 static const struct symbol_register_ops coff_register_funcs
= {
1616 /* The "aclass" index for computed COFF symbols. */
1618 static int coff_register_index
;
1620 static struct symbol
*
1621 process_coff_symbol (struct coff_symbol
*cs
,
1622 union internal_auxent
*aux
,
1623 struct objfile
*objfile
)
1625 struct symbol
*sym
= allocate_symbol (objfile
);
1629 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
1630 SYMBOL_SET_LANGUAGE (sym
, get_current_subfile ()->language
,
1631 &objfile
->objfile_obstack
);
1632 SYMBOL_SET_NAMES (sym
, name
, strlen (name
), 1, objfile
);
1634 /* default assumptions */
1635 SYMBOL_VALUE (sym
) = cs
->c_value
;
1636 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
1637 SYMBOL_SECTION (sym
) = cs_to_section (cs
, objfile
);
1639 if (ISFCN (cs
->c_type
))
1641 SYMBOL_VALUE (sym
) += ANOFFSET (objfile
->section_offsets
,
1642 SECT_OFF_TEXT (objfile
));
1644 lookup_function_type (decode_function_type (cs
, cs
->c_type
,
1647 SYMBOL_ACLASS_INDEX (sym
) = LOC_BLOCK
;
1648 if (cs
->c_sclass
== C_STAT
|| cs
->c_sclass
== C_THUMBSTAT
1649 || cs
->c_sclass
== C_THUMBSTATFUNC
)
1650 add_symbol_to_list (sym
, &file_symbols
);
1651 else if (cs
->c_sclass
== C_EXT
|| cs
->c_sclass
== C_THUMBEXT
1652 || cs
->c_sclass
== C_THUMBEXTFUNC
)
1653 add_symbol_to_list (sym
, &global_symbols
);
1657 SYMBOL_TYPE (sym
) = decode_type (cs
, cs
->c_type
, aux
, objfile
);
1658 switch (cs
->c_sclass
)
1664 SYMBOL_ACLASS_INDEX (sym
) = LOC_LOCAL
;
1665 add_symbol_to_list (sym
, &local_symbols
);
1669 case C_THUMBEXTFUNC
:
1671 SYMBOL_ACLASS_INDEX (sym
) = LOC_STATIC
;
1672 SYMBOL_VALUE_ADDRESS (sym
) = (CORE_ADDR
) cs
->c_value
;
1673 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (objfile
->section_offsets
,
1674 SECT_OFF_TEXT (objfile
));
1675 add_symbol_to_list (sym
, &global_symbols
);
1679 case C_THUMBSTATFUNC
:
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 if (within_function
)
1687 /* Static symbol of local scope. */
1688 add_symbol_to_list (sym
, &local_symbols
);
1692 /* Static symbol at top level of file. */
1693 add_symbol_to_list (sym
, &file_symbols
);
1697 #ifdef C_GLBLREG /* AMD coff */
1701 SYMBOL_ACLASS_INDEX (sym
) = coff_register_index
;
1702 SYMBOL_VALUE (sym
) = cs
->c_value
;
1703 add_symbol_to_list (sym
, &local_symbols
);
1711 SYMBOL_ACLASS_INDEX (sym
) = LOC_ARG
;
1712 SYMBOL_IS_ARGUMENT (sym
) = 1;
1713 add_symbol_to_list (sym
, &local_symbols
);
1717 SYMBOL_ACLASS_INDEX (sym
) = coff_register_index
;
1718 SYMBOL_IS_ARGUMENT (sym
) = 1;
1719 SYMBOL_VALUE (sym
) = cs
->c_value
;
1720 add_symbol_to_list (sym
, &local_symbols
);
1724 SYMBOL_ACLASS_INDEX (sym
) = LOC_TYPEDEF
;
1725 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
1727 /* If type has no name, give it one. */
1728 if (TYPE_NAME (SYMBOL_TYPE (sym
)) == 0)
1730 if (TYPE_CODE (SYMBOL_TYPE (sym
)) == TYPE_CODE_PTR
1731 || TYPE_CODE (SYMBOL_TYPE (sym
)) == TYPE_CODE_FUNC
)
1733 /* If we are giving a name to a type such as
1734 "pointer to foo" or "function returning foo", we
1735 better not set the TYPE_NAME. If the program
1736 contains "typedef char *caddr_t;", we don't want
1737 all variables of type char * to print as caddr_t.
1738 This is not just a consequence of GDB's type
1739 management; CC and GCC (at least through version
1740 2.4) both output variables of either type char *
1741 or caddr_t with the type refering to the C_TPDEF
1742 symbol for caddr_t. If a future compiler cleans
1743 this up it GDB is not ready for it yet, but if it
1744 becomes ready we somehow need to disable this
1745 check (without breaking the PCC/GCC2.4 case).
1749 Fortunately, this check seems not to be necessary
1750 for anything except pointers or functions. */
1754 TYPE_NAME (SYMBOL_TYPE (sym
)) =
1755 xstrdup (SYMBOL_LINKAGE_NAME (sym
));
1758 /* Keep track of any type which points to empty structured
1759 type, so it can be filled from a definition from another
1760 file. A simple forward reference (TYPE_CODE_UNDEF) is
1761 not an empty structured type, though; the forward
1762 references work themselves out via the magic of
1763 coff_lookup_type. */
1764 if (TYPE_CODE (SYMBOL_TYPE (sym
)) == TYPE_CODE_PTR
1765 && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym
))) == 0
1766 && TYPE_CODE (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym
)))
1769 int i
= hashname (SYMBOL_LINKAGE_NAME (sym
));
1771 SYMBOL_VALUE_CHAIN (sym
) = opaque_type_chain
[i
];
1772 opaque_type_chain
[i
] = sym
;
1774 add_symbol_to_list (sym
, &file_symbols
);
1780 SYMBOL_ACLASS_INDEX (sym
) = LOC_TYPEDEF
;
1781 SYMBOL_DOMAIN (sym
) = STRUCT_DOMAIN
;
1783 /* Some compilers try to be helpful by inventing "fake"
1784 names for anonymous enums, structures, and unions, like
1785 "~0fake" or ".0fake". Thanks, but no thanks... */
1786 if (TYPE_NAME (SYMBOL_TYPE (sym
)) == 0)
1787 if (SYMBOL_LINKAGE_NAME (sym
) != NULL
1788 && *SYMBOL_LINKAGE_NAME (sym
) != '~'
1789 && *SYMBOL_LINKAGE_NAME (sym
) != '.')
1790 TYPE_NAME (SYMBOL_TYPE (sym
)) =
1791 concat (SYMBOL_LINKAGE_NAME (sym
), (char *)NULL
);
1793 add_symbol_to_list (sym
, &file_symbols
);
1803 /* Decode a coff type specifier; return the type that is meant. */
1805 static struct type
*
1806 decode_type (struct coff_symbol
*cs
, unsigned int c_type
,
1807 union internal_auxent
*aux
, struct objfile
*objfile
)
1809 struct type
*type
= 0;
1810 unsigned int new_c_type
;
1812 if (c_type
& ~N_BTMASK
)
1814 new_c_type
= DECREF (c_type
);
1817 type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1818 type
= lookup_pointer_type (type
);
1820 else if (ISFCN (c_type
))
1822 type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1823 type
= lookup_function_type (type
);
1825 else if (ISARY (c_type
))
1828 unsigned short *dim
;
1829 struct type
*base_type
, *index_type
, *range_type
;
1831 /* Define an array type. */
1832 /* auxent refers to array, not base type. */
1833 if (aux
->x_sym
.x_tagndx
.l
== 0)
1836 /* Shift the indices down. */
1837 dim
= &aux
->x_sym
.x_fcnary
.x_ary
.x_dimen
[0];
1840 for (i
= 0; *dim
&& i
< DIMNUM
- 1; i
++, dim
++)
1844 base_type
= decode_type (cs
, new_c_type
, aux
, objfile
);
1845 index_type
= objfile_type (objfile
)->builtin_int
;
1847 = create_static_range_type ((struct type
*) NULL
,
1848 index_type
, 0, n
- 1);
1850 create_array_type ((struct type
*) NULL
,
1851 base_type
, range_type
);
1856 /* Reference to existing type. This only occurs with the struct,
1857 union, and enum types. EPI a29k coff fakes us out by producing
1858 aux entries with a nonzero x_tagndx for definitions of structs,
1859 unions, and enums, so we have to check the c_sclass field. SCO
1860 3.2v4 cc gets confused with pointers to pointers to defined
1861 structs, and generates negative x_tagndx fields. */
1862 if (cs
->c_naux
> 0 && aux
->x_sym
.x_tagndx
.l
!= 0)
1864 if (cs
->c_sclass
!= C_STRTAG
1865 && cs
->c_sclass
!= C_UNTAG
1866 && cs
->c_sclass
!= C_ENTAG
1867 && aux
->x_sym
.x_tagndx
.l
>= 0)
1869 type
= coff_alloc_type (aux
->x_sym
.x_tagndx
.l
);
1874 complaint (_("Symbol table entry for %s has bad tagndx value"),
1876 /* And fall through to decode_base_type... */
1880 return decode_base_type (cs
, BTYPE (c_type
), aux
, objfile
);
1883 /* Decode a coff type specifier for function definition;
1884 return the type that the function returns. */
1886 static struct type
*
1887 decode_function_type (struct coff_symbol
*cs
,
1888 unsigned int c_type
,
1889 union internal_auxent
*aux
,
1890 struct objfile
*objfile
)
1892 if (aux
->x_sym
.x_tagndx
.l
== 0)
1893 cs
->c_naux
= 0; /* auxent refers to function, not base
1896 return decode_type (cs
, DECREF (c_type
), aux
, objfile
);
1899 /* Basic C types. */
1901 static struct type
*
1902 decode_base_type (struct coff_symbol
*cs
,
1903 unsigned int c_type
,
1904 union internal_auxent
*aux
,
1905 struct objfile
*objfile
)
1907 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
1913 /* Shows up with "void (*foo)();" structure members. */
1914 return objfile_type (objfile
)->builtin_void
;
1918 /* Intel 960 COFF has this symbol and meaning. */
1919 return objfile_type (objfile
)->builtin_void
;
1923 return objfile_type (objfile
)->builtin_char
;
1926 return objfile_type (objfile
)->builtin_short
;
1929 return objfile_type (objfile
)->builtin_int
;
1932 if (cs
->c_sclass
== C_FIELD
1933 && aux
->x_sym
.x_misc
.x_lnsz
.x_size
1934 > gdbarch_long_bit (gdbarch
))
1935 return objfile_type (objfile
)->builtin_long_long
;
1937 return objfile_type (objfile
)->builtin_long
;
1940 return objfile_type (objfile
)->builtin_float
;
1943 return objfile_type (objfile
)->builtin_double
;
1946 return objfile_type (objfile
)->builtin_long_double
;
1949 if (cs
->c_naux
!= 1)
1951 /* Anonymous structure type. */
1952 type
= coff_alloc_type (cs
->c_symnum
);
1953 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
1954 TYPE_NAME (type
) = NULL
;
1955 INIT_CPLUS_SPECIFIC (type
);
1956 TYPE_LENGTH (type
) = 0;
1957 TYPE_FIELDS (type
) = 0;
1958 TYPE_NFIELDS (type
) = 0;
1962 type
= coff_read_struct_type (cs
->c_symnum
,
1963 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
1964 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
1970 if (cs
->c_naux
!= 1)
1972 /* Anonymous union type. */
1973 type
= coff_alloc_type (cs
->c_symnum
);
1974 TYPE_NAME (type
) = NULL
;
1975 INIT_CPLUS_SPECIFIC (type
);
1976 TYPE_LENGTH (type
) = 0;
1977 TYPE_FIELDS (type
) = 0;
1978 TYPE_NFIELDS (type
) = 0;
1982 type
= coff_read_struct_type (cs
->c_symnum
,
1983 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
1984 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
1987 TYPE_CODE (type
) = TYPE_CODE_UNION
;
1991 if (cs
->c_naux
!= 1)
1993 /* Anonymous enum type. */
1994 type
= coff_alloc_type (cs
->c_symnum
);
1995 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1996 TYPE_NAME (type
) = NULL
;
1997 TYPE_LENGTH (type
) = 0;
1998 TYPE_FIELDS (type
) = 0;
1999 TYPE_NFIELDS (type
) = 0;
2003 type
= coff_read_enum_type (cs
->c_symnum
,
2004 aux
->x_sym
.x_misc
.x_lnsz
.x_size
,
2005 aux
->x_sym
.x_fcnary
.x_fcn
.x_endndx
.l
,
2011 /* Shouldn't show up here. */
2015 return objfile_type (objfile
)->builtin_unsigned_char
;
2018 return objfile_type (objfile
)->builtin_unsigned_short
;
2021 return objfile_type (objfile
)->builtin_unsigned_int
;
2024 if (cs
->c_sclass
== C_FIELD
2025 && aux
->x_sym
.x_misc
.x_lnsz
.x_size
2026 > gdbarch_long_bit (gdbarch
))
2027 return objfile_type (objfile
)->builtin_unsigned_long_long
;
2029 return objfile_type (objfile
)->builtin_unsigned_long
;
2031 complaint (_("Unexpected type for symbol %s"), cs
->c_name
);
2032 return objfile_type (objfile
)->builtin_void
;
2035 /* This page contains subroutines of read_type. */
2037 /* Read the description of a structure (or union type) and return an
2038 object describing the type. */
2040 static struct type
*
2041 coff_read_struct_type (int index
, int length
, int lastsym
,
2042 struct objfile
*objfile
)
2046 struct nextfield
*next
;
2051 struct nextfield
*list
= 0;
2052 struct nextfield
*newobj
;
2056 struct coff_symbol member_sym
;
2057 struct coff_symbol
*ms
= &member_sym
;
2058 struct internal_syment sub_sym
;
2059 union internal_auxent sub_aux
;
2062 type
= coff_alloc_type (index
);
2063 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
2064 INIT_CPLUS_SPECIFIC (type
);
2065 TYPE_LENGTH (type
) = length
;
2067 while (!done
&& symnum
< lastsym
&& symnum
< nlist_nsyms_global
)
2069 read_one_sym (ms
, &sub_sym
, &sub_aux
);
2071 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
2073 switch (ms
->c_sclass
)
2078 /* Get space to record the next field's data. */
2079 newobj
= XALLOCA (struct nextfield
);
2080 newobj
->next
= list
;
2083 /* Save the data. */
2085 = (const char *) obstack_copy0 (&objfile
->objfile_obstack
,
2086 name
, strlen (name
));
2087 FIELD_TYPE (list
->field
) = decode_type (ms
, ms
->c_type
,
2089 SET_FIELD_BITPOS (list
->field
, 8 * ms
->c_value
);
2090 FIELD_BITSIZE (list
->field
) = 0;
2096 /* Get space to record the next field's data. */
2097 newobj
= XALLOCA (struct nextfield
);
2098 newobj
->next
= list
;
2101 /* Save the data. */
2103 = (const char *) obstack_copy0 (&objfile
->objfile_obstack
,
2104 name
, strlen (name
));
2105 FIELD_TYPE (list
->field
) = decode_type (ms
, ms
->c_type
,
2107 SET_FIELD_BITPOS (list
->field
, ms
->c_value
);
2108 FIELD_BITSIZE (list
->field
) = sub_aux
.x_sym
.x_misc
.x_lnsz
.x_size
;
2117 /* Now create the vector of fields, and record how big it is. */
2119 TYPE_NFIELDS (type
) = nfields
;
2120 TYPE_FIELDS (type
) = (struct field
*)
2121 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
2123 /* Copy the saved-up fields into the field vector. */
2125 for (n
= nfields
; list
; list
= list
->next
)
2126 TYPE_FIELD (type
, --n
) = list
->field
;
2131 /* Read a definition of an enumeration type,
2132 and create and return a suitable type object.
2133 Also defines the symbols that represent the values of the type. */
2135 static struct type
*
2136 coff_read_enum_type (int index
, int length
, int lastsym
,
2137 struct objfile
*objfile
)
2139 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
2144 struct pending
**symlist
;
2145 struct coff_symbol member_sym
;
2146 struct coff_symbol
*ms
= &member_sym
;
2147 struct internal_syment sub_sym
;
2148 union internal_auxent sub_aux
;
2149 struct pending
*osyms
, *syms
;
2153 int unsigned_enum
= 1;
2155 type
= coff_alloc_type (index
);
2156 if (within_function
)
2157 symlist
= &local_symbols
;
2159 symlist
= &file_symbols
;
2161 o_nsyms
= osyms
? osyms
->nsyms
: 0;
2163 while (!done
&& symnum
< lastsym
&& symnum
< nlist_nsyms_global
)
2165 read_one_sym (ms
, &sub_sym
, &sub_aux
);
2167 name
= EXTERNAL_NAME (name
, objfile
->obfd
);
2169 switch (ms
->c_sclass
)
2172 sym
= allocate_symbol (objfile
);
2174 name
= (char *) obstack_copy0 (&objfile
->objfile_obstack
, name
,
2176 SYMBOL_SET_LINKAGE_NAME (sym
, name
);
2177 SYMBOL_ACLASS_INDEX (sym
) = LOC_CONST
;
2178 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
2179 SYMBOL_VALUE (sym
) = ms
->c_value
;
2180 add_symbol_to_list (sym
, symlist
);
2185 /* Sometimes the linker (on 386/ix 2.0.2 at least) screws
2186 up the count of how many symbols to read. So stop
2193 /* Now fill in the fields of the type-structure. */
2196 TYPE_LENGTH (type
) = length
;
2197 else /* Assume ints. */
2198 TYPE_LENGTH (type
) = gdbarch_int_bit (gdbarch
) / TARGET_CHAR_BIT
;
2199 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
2200 TYPE_NFIELDS (type
) = nsyms
;
2201 TYPE_FIELDS (type
) = (struct field
*)
2202 TYPE_ALLOC (type
, sizeof (struct field
) * nsyms
);
2204 /* Find the symbols for the values and put them into the type.
2205 The symbols can be found in the symlist that we put them on
2206 to cause them to be defined. osyms contains the old value
2207 of that symlist; everything up to there was defined by us. */
2208 /* Note that we preserve the order of the enum constants, so
2209 that in something like "enum {FOO, LAST_THING=FOO}" we print
2210 FOO, not LAST_THING. */
2212 for (syms
= *symlist
, n
= 0; syms
; syms
= syms
->next
)
2218 for (; j
< syms
->nsyms
; j
++, n
++)
2220 struct symbol
*xsym
= syms
->symbol
[j
];
2222 SYMBOL_TYPE (xsym
) = type
;
2223 TYPE_FIELD_NAME (type
, n
) = SYMBOL_LINKAGE_NAME (xsym
);
2224 SET_FIELD_ENUMVAL (TYPE_FIELD (type
, n
), SYMBOL_VALUE (xsym
));
2225 if (SYMBOL_VALUE (xsym
) < 0)
2227 TYPE_FIELD_BITSIZE (type
, n
) = 0;
2234 TYPE_UNSIGNED (type
) = 1;
2239 /* Register our ability to parse symbols for coff BFD files. */
2241 static const struct sym_fns coff_sym_fns
=
2243 coff_new_init
, /* sym_new_init: init anything gbl to
2245 coff_symfile_init
, /* sym_init: read initial info, setup
2247 coff_symfile_read
, /* sym_read: read a symbol file into
2249 NULL
, /* sym_read_psymbols */
2250 coff_symfile_finish
, /* sym_finish: finished with file,
2252 default_symfile_offsets
, /* sym_offsets: xlate external to
2254 default_symfile_segments
, /* sym_segments: Get segment
2255 information from a file */
2256 NULL
, /* sym_read_linetable */
2258 default_symfile_relocate
, /* sym_relocate: Relocate a debug
2260 NULL
, /* sym_probe_fns */
2264 /* Free the per-objfile COFF data. */
2267 coff_free_info (struct objfile
*objfile
, void *arg
)
2273 _initialize_coffread (void)
2275 add_symtab_fns (bfd_target_coff_flavour
, &coff_sym_fns
);
2277 coff_objfile_data_key
= register_objfile_data_with_cleanup (NULL
,
2281 = register_symbol_register_impl (LOC_REGISTER
, &coff_register_funcs
);