1 /* DWARF debugging format support for GDB.
2 Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
3 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
4 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 FIXME: Do we need to generate dependencies in partial symtabs?
25 (Perhaps we don't need to).
27 FIXME: Resolve minor differences between what information we put in the
28 partial symbol table and what dbxread puts in. For example, we don't yet
29 put enum constants there. And dbxread seems to invent a lot of typedefs
30 we never see. Use the new printpsym command to see the partial symbol table
33 FIXME: Figure out a better way to tell gdb about the name of the function
34 contain the user's entry point (I.E. main())
36 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
37 other things to work on, if you get bored. :-)
46 #include "elf/dwarf.h"
49 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
51 #include "complaints.h"
60 /* FIXME -- convert this to SEEK_SET a la POSIX, move to config files. */
65 /* Some macros to provide DIE info for complaints. */
67 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
68 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
70 /* Complaints that can be issued during DWARF debug info reading. */
72 struct complaint no_bfd_get_N
=
74 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object", 0, 0
77 struct complaint malformed_die
=
79 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%d bytes)", 0, 0
82 struct complaint bad_die_ref
=
84 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit", 0, 0
87 struct complaint unknown_attribute_form
=
89 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", 0, 0
92 struct complaint unknown_attribute_length
=
94 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes", 0, 0
97 struct complaint unexpected_fund_type
=
99 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x", 0, 0
102 struct complaint unknown_type_modifier
=
104 "DIE @ 0x%x \"%s\", unknown type modifier %u", 0, 0
107 struct complaint volatile_ignored
=
109 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored", 0, 0
112 struct complaint const_ignored
=
114 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", 0, 0
117 struct complaint botched_modified_type
=
119 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)", 0, 0
122 struct complaint op_deref2
=
124 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%x not handled", 0, 0
127 struct complaint op_deref4
=
129 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%x not handled", 0, 0
132 struct complaint basereg_not_handled
=
134 "DIE @ 0x%x \"%s\", BASEREG %d not handled", 0, 0
137 struct complaint dup_user_type_allocation
=
139 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation", 0, 0
142 struct complaint dup_user_type_definition
=
144 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition", 0, 0
147 struct complaint missing_tag
=
149 "DIE @ 0x%x \"%s\", missing class, structure, or union tag", 0, 0
152 struct complaint bad_array_element_type
=
154 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", 0, 0
157 struct complaint subscript_data_items
=
159 "DIE @ 0x%x \"%s\", can't decode subscript data items", 0, 0
162 struct complaint unhandled_array_subscript_format
=
164 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet", 0, 0
167 struct complaint unknown_array_subscript_format
=
169 "DIE @ 0x%x \"%s\", unknown array subscript format %x", 0, 0
172 struct complaint not_row_major
=
174 "DIE @ 0x%x \"%s\", array not row major; not handled correctly", 0, 0
177 typedef unsigned int DIE_REF
; /* Reference to a DIE */
180 #define GCC_PRODUCER "GNU C "
183 #ifndef GPLUS_PRODUCER
184 #define GPLUS_PRODUCER "GNU C++ "
188 #define LCC_PRODUCER "NCR C/C++"
191 #ifndef CHILL_PRODUCER
192 #define CHILL_PRODUCER "GNU Chill "
195 /* Provide a default mapping from a DWARF register number to a gdb REGNUM. */
196 #ifndef DWARF_REG_TO_REGNUM
197 #define DWARF_REG_TO_REGNUM(num) (num)
200 /* Flags to target_to_host() that tell whether or not the data object is
201 expected to be signed. Used, for example, when fetching a signed
202 integer in the target environment which is used as a signed integer
203 in the host environment, and the two environments have different sized
204 ints. In this case, *somebody* has to sign extend the smaller sized
207 #define GET_UNSIGNED 0 /* No sign extension required */
208 #define GET_SIGNED 1 /* Sign extension required */
210 /* Defines for things which are specified in the document "DWARF Debugging
211 Information Format" published by UNIX International, Programming Languages
212 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
214 #define SIZEOF_DIE_LENGTH 4
215 #define SIZEOF_DIE_TAG 2
216 #define SIZEOF_ATTRIBUTE 2
217 #define SIZEOF_FORMAT_SPECIFIER 1
218 #define SIZEOF_FMT_FT 2
219 #define SIZEOF_LINETBL_LENGTH 4
220 #define SIZEOF_LINETBL_LINENO 4
221 #define SIZEOF_LINETBL_STMT 2
222 #define SIZEOF_LINETBL_DELTA 4
223 #define SIZEOF_LOC_ATOM_CODE 1
225 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
227 /* Macros that return the sizes of various types of data in the target
230 FIXME: Currently these are just compile time constants (as they are in
231 other parts of gdb as well). They need to be able to get the right size
232 either from the bfd or possibly from the DWARF info. It would be nice if
233 the DWARF producer inserted DIES that describe the fundamental types in
234 the target environment into the DWARF info, similar to the way dbx stabs
235 producers produce information about their fundamental types. */
237 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
238 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
240 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
241 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
242 However, the Issue 2 DWARF specification from AT&T defines it as
243 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
244 For backwards compatibility with the AT&T compiler produced executables
245 we define AT_short_element_list for this variant. */
247 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
249 /* External variables referenced. */
251 extern int info_verbose
; /* From main.c; nonzero => verbose */
252 extern char *warning_pre_print
; /* From utils.c */
254 /* The DWARF debugging information consists of two major pieces,
255 one is a block of DWARF Information Entries (DIE's) and the other
256 is a line number table. The "struct dieinfo" structure contains
257 the information for a single DIE, the one currently being processed.
259 In order to make it easier to randomly access the attribute fields
260 of the current DIE, which are specifically unordered within the DIE,
261 each DIE is scanned and an instance of the "struct dieinfo"
262 structure is initialized.
264 Initialization is done in two levels. The first, done by basicdieinfo(),
265 just initializes those fields that are vital to deciding whether or not
266 to use this DIE, how to skip past it, etc. The second, done by the
267 function completedieinfo(), fills in the rest of the information.
269 Attributes which have block forms are not interpreted at the time
270 the DIE is scanned, instead we just save pointers to the start
271 of their value fields.
273 Some fields have a flag <name>_p that is set when the value of the
274 field is valid (I.E. we found a matching attribute in the DIE). Since
275 we may want to test for the presence of some attributes in the DIE,
276 such as AT_low_pc, without restricting the values of the field,
277 we need someway to note that we found such an attribute.
284 char * die
; /* Pointer to the raw DIE data */
285 unsigned long die_length
; /* Length of the raw DIE data */
286 DIE_REF die_ref
; /* Offset of this DIE */
287 unsigned short die_tag
; /* Tag for this DIE */
288 unsigned long at_padding
;
289 unsigned long at_sibling
;
292 unsigned short at_fund_type
;
293 BLOCK
* at_mod_fund_type
;
294 unsigned long at_user_def_type
;
295 BLOCK
* at_mod_u_d_type
;
296 unsigned short at_ordering
;
297 BLOCK
* at_subscr_data
;
298 unsigned long at_byte_size
;
299 unsigned short at_bit_offset
;
300 unsigned long at_bit_size
;
301 BLOCK
* at_element_list
;
302 unsigned long at_stmt_list
;
304 CORE_ADDR at_high_pc
;
305 unsigned long at_language
;
306 unsigned long at_member
;
307 unsigned long at_discr
;
308 BLOCK
* at_discr_value
;
309 BLOCK
* at_string_length
;
312 unsigned long at_start_scope
;
313 unsigned long at_stride_size
;
314 unsigned long at_src_info
;
315 char * at_prototyped
;
316 unsigned int has_at_low_pc
:1;
317 unsigned int has_at_stmt_list
:1;
318 unsigned int has_at_byte_size
:1;
319 unsigned int short_element_list
:1;
322 static int diecount
; /* Approximate count of dies for compilation unit */
323 static struct dieinfo
*curdie
; /* For warnings and such */
325 static char *dbbase
; /* Base pointer to dwarf info */
326 static int dbsize
; /* Size of dwarf info in bytes */
327 static int dbroff
; /* Relative offset from start of .debug section */
328 static char *lnbase
; /* Base pointer to line section */
329 static int isreg
; /* Kludge to identify register variables */
330 /* Kludge to identify basereg references. Nonzero if we have an offset
331 relative to a basereg. */
333 /* Which base register is it relative to? */
336 /* This value is added to each symbol value. FIXME: Generalize to
337 the section_offsets structure used by dbxread (once this is done,
338 pass the appropriate section number to end_symtab). */
339 static CORE_ADDR baseaddr
; /* Add to each symbol value */
341 /* The section offsets used in the current psymtab or symtab. FIXME,
342 only used to pass one value (baseaddr) at the moment. */
343 static struct section_offsets
*base_section_offsets
;
345 /* We put a pointer to this structure in the read_symtab_private field
349 /* Always the absolute file offset to the start of the ".debug"
350 section for the file containing the DIE's being accessed. */
352 /* Relative offset from the start of the ".debug" section to the
353 first DIE to be accessed. When building the partial symbol
354 table, this value will be zero since we are accessing the
355 entire ".debug" section. When expanding a partial symbol
356 table entry, this value will be the offset to the first
357 DIE for the compilation unit containing the symbol that
358 triggers the expansion. */
360 /* The size of the chunk of DIE's being examined, in bytes. */
362 /* The absolute file offset to the line table fragment. Ignored
363 when building partial symbol tables, but used when expanding
364 them, and contains the absolute file offset to the fragment
365 of the ".line" section containing the line numbers for the
366 current compilation unit. */
370 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
371 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
372 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
373 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
375 /* The generic symbol table building routines have separate lists for
376 file scope symbols and all all other scopes (local scopes). So
377 we need to select the right one to pass to add_symbol_to_list().
378 We do it by keeping a pointer to the correct list in list_in_scope.
380 FIXME: The original dwarf code just treated the file scope as the first
381 local scope, and all other local scopes as nested local scopes, and worked
382 fine. Check to see if we really need to distinguish these in buildsym.c */
384 struct pending
**list_in_scope
= &file_symbols
;
386 /* DIES which have user defined types or modified user defined types refer to
387 other DIES for the type information. Thus we need to associate the offset
388 of a DIE for a user defined type with a pointer to the type information.
390 Originally this was done using a simple but expensive algorithm, with an
391 array of unsorted structures, each containing an offset/type-pointer pair.
392 This array was scanned linearly each time a lookup was done. The result
393 was that gdb was spending over half it's startup time munging through this
394 array of pointers looking for a structure that had the right offset member.
396 The second attempt used the same array of structures, but the array was
397 sorted using qsort each time a new offset/type was recorded, and a binary
398 search was used to find the type pointer for a given DIE offset. This was
399 even slower, due to the overhead of sorting the array each time a new
400 offset/type pair was entered.
402 The third attempt uses a fixed size array of type pointers, indexed by a
403 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
404 we can divide any DIE offset by 4 to obtain a unique index into this fixed
405 size array. Since each element is a 4 byte pointer, it takes exactly as
406 much memory to hold this array as to hold the DWARF info for a given
407 compilation unit. But it gets freed as soon as we are done with it.
408 This has worked well in practice, as a reasonable tradeoff between memory
409 consumption and speed, without having to resort to much more complicated
412 static struct type
**utypes
; /* Pointer to array of user type pointers */
413 static int numutypes
; /* Max number of user type pointers */
415 /* Maintain an array of referenced fundamental types for the current
416 compilation unit being read. For DWARF version 1, we have to construct
417 the fundamental types on the fly, since no information about the
418 fundamental types is supplied. Each such fundamental type is created by
419 calling a language dependent routine to create the type, and then a
420 pointer to that type is then placed in the array at the index specified
421 by it's FT_<TYPENAME> value. The array has a fixed size set by the
422 FT_NUM_MEMBERS compile time constant, which is the number of predefined
423 fundamental types gdb knows how to construct. */
425 static struct type
*ftypes
[FT_NUM_MEMBERS
]; /* Fundamental types */
427 /* Record the language for the compilation unit which is currently being
428 processed. We know it once we have seen the TAG_compile_unit DIE,
429 and we need it while processing the DIE's for that compilation unit.
430 It is eventually saved in the symtab structure, but we don't finalize
431 the symtab struct until we have processed all the DIE's for the
432 compilation unit. We also need to get and save a pointer to the
433 language struct for this language, so we can call the language
434 dependent routines for doing things such as creating fundamental
437 static enum language cu_language
;
438 static const struct language_defn
*cu_language_defn
;
440 /* Forward declarations of static functions so we don't have to worry
441 about ordering within this file. */
444 attribute_size
PARAMS ((unsigned int));
447 target_to_host
PARAMS ((char *, int, int, struct objfile
*));
450 add_enum_psymbol
PARAMS ((struct dieinfo
*, struct objfile
*));
453 handle_producer
PARAMS ((char *));
456 read_file_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
459 read_func_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
462 read_lexical_block_scope
PARAMS ((struct dieinfo
*, char *, char *,
466 scan_partial_symbols
PARAMS ((char *, char *, struct objfile
*));
469 scan_compilation_units
PARAMS ((char *, char *, file_ptr
,
470 file_ptr
, struct objfile
*));
473 add_partial_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
476 basicdieinfo
PARAMS ((struct dieinfo
*, char *, struct objfile
*));
479 completedieinfo
PARAMS ((struct dieinfo
*, struct objfile
*));
482 dwarf_psymtab_to_symtab
PARAMS ((struct partial_symtab
*));
485 psymtab_to_symtab_1
PARAMS ((struct partial_symtab
*));
488 read_ofile_symtab
PARAMS ((struct partial_symtab
*));
491 process_dies
PARAMS ((char *, char *, struct objfile
*));
494 read_structure_scope
PARAMS ((struct dieinfo
*, char *, char *,
498 decode_array_element_type
PARAMS ((char *));
501 decode_subscript_data_item
PARAMS ((char *, char *));
504 dwarf_read_array_type
PARAMS ((struct dieinfo
*));
507 read_tag_pointer_type
PARAMS ((struct dieinfo
*dip
));
510 read_tag_string_type
PARAMS ((struct dieinfo
*dip
));
513 read_subroutine_type
PARAMS ((struct dieinfo
*, char *, char *));
516 read_enumeration
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
519 struct_type
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
522 enum_type
PARAMS ((struct dieinfo
*, struct objfile
*));
525 decode_line_numbers
PARAMS ((char *));
528 decode_die_type
PARAMS ((struct dieinfo
*));
531 decode_mod_fund_type
PARAMS ((char *));
534 decode_mod_u_d_type
PARAMS ((char *));
537 decode_modified_type
PARAMS ((char *, unsigned int, int));
540 decode_fund_type
PARAMS ((unsigned int));
543 create_name
PARAMS ((char *, struct obstack
*));
546 lookup_utype
PARAMS ((DIE_REF
));
549 alloc_utype
PARAMS ((DIE_REF
, struct type
*));
551 static struct symbol
*
552 new_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
555 synthesize_typedef
PARAMS ((struct dieinfo
*, struct objfile
*,
559 locval
PARAMS ((char *));
562 set_cu_language
PARAMS ((struct dieinfo
*));
565 dwarf_fundamental_type
PARAMS ((struct objfile
*, int));
572 dwarf_fundamental_type -- lookup or create a fundamental type
577 dwarf_fundamental_type (struct objfile *objfile, int typeid)
581 DWARF version 1 doesn't supply any fundamental type information,
582 so gdb has to construct such types. It has a fixed number of
583 fundamental types that it knows how to construct, which is the
584 union of all types that it knows how to construct for all languages
585 that it knows about. These are enumerated in gdbtypes.h.
587 As an example, assume we find a DIE that references a DWARF
588 fundamental type of FT_integer. We first look in the ftypes
589 array to see if we already have such a type, indexed by the
590 gdb internal value of FT_INTEGER. If so, we simply return a
591 pointer to that type. If not, then we ask an appropriate
592 language dependent routine to create a type FT_INTEGER, using
593 defaults reasonable for the current target machine, and install
594 that type in ftypes for future reference.
598 Pointer to a fundamental type.
603 dwarf_fundamental_type (objfile
, typeid)
604 struct objfile
*objfile
;
607 if (typeid < 0 || typeid >= FT_NUM_MEMBERS
)
609 error ("internal error - invalid fundamental type id %d", typeid);
612 /* Look for this particular type in the fundamental type vector. If one is
613 not found, create and install one appropriate for the current language
614 and the current target machine. */
616 if (ftypes
[typeid] == NULL
)
618 ftypes
[typeid] = cu_language_defn
-> la_fund_type(objfile
, typeid);
621 return (ftypes
[typeid]);
628 set_cu_language -- set local copy of language for compilation unit
633 set_cu_language (struct dieinfo *dip)
637 Decode the language attribute for a compilation unit DIE and
638 remember what the language was. We use this at various times
639 when processing DIE's for a given compilation unit.
648 set_cu_language (dip
)
651 switch (dip
-> at_language
)
655 cu_language
= language_c
;
657 case LANG_C_PLUS_PLUS
:
658 cu_language
= language_cplus
;
661 cu_language
= language_chill
;
664 cu_language
= language_m2
;
672 /* We don't know anything special about these yet. */
673 cu_language
= language_unknown
;
676 /* If no at_language, try to deduce one from the filename */
677 cu_language
= deduce_language_from_filename (dip
-> at_name
);
680 cu_language_defn
= language_def (cu_language
);
687 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
691 void dwarf_build_psymtabs (struct objfile *objfile,
692 struct section_offsets *section_offsets,
693 int mainline, file_ptr dbfoff, unsigned int dbfsize,
694 file_ptr lnoffset, unsigned int lnsize)
698 This function is called upon to build partial symtabs from files
699 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
701 It is passed a bfd* containing the DIES
702 and line number information, the corresponding filename for that
703 file, a base address for relocating the symbols, a flag indicating
704 whether or not this debugging information is from a "main symbol
705 table" rather than a shared library or dynamically linked file,
706 and file offset/size pairs for the DIE information and line number
716 dwarf_build_psymtabs (objfile
, section_offsets
, mainline
, dbfoff
, dbfsize
,
718 struct objfile
*objfile
;
719 struct section_offsets
*section_offsets
;
722 unsigned int dbfsize
;
726 bfd
*abfd
= objfile
->obfd
;
727 struct cleanup
*back_to
;
729 current_objfile
= objfile
;
731 dbbase
= xmalloc (dbsize
);
733 if ((bfd_seek (abfd
, dbfoff
, L_SET
) != 0) ||
734 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
737 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
739 back_to
= make_cleanup (free
, dbbase
);
741 /* If we are reinitializing, or if we have never loaded syms yet, init.
742 Since we have no idea how many DIES we are looking at, we just guess
743 some arbitrary value. */
745 if (mainline
|| objfile
-> global_psymbols
.size
== 0 ||
746 objfile
-> static_psymbols
.size
== 0)
748 init_psymbol_list (objfile
, 1024);
751 /* Save the relocation factor where everybody can see it. */
753 base_section_offsets
= section_offsets
;
754 baseaddr
= ANOFFSET (section_offsets
, 0);
756 /* Follow the compilation unit sibling chain, building a partial symbol
757 table entry for each one. Save enough information about each compilation
758 unit to locate the full DWARF information later. */
760 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
762 do_cleanups (back_to
);
763 current_objfile
= NULL
;
770 read_lexical_block_scope -- process all dies in a lexical block
774 static void read_lexical_block_scope (struct dieinfo *dip,
775 char *thisdie, char *enddie)
779 Process all the DIES contained within a lexical block scope.
780 Start a new scope, process the dies, and then close the scope.
785 read_lexical_block_scope (dip
, thisdie
, enddie
, objfile
)
789 struct objfile
*objfile
;
791 register struct context_stack
*new;
793 push_context (0, dip
-> at_low_pc
);
794 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
795 new = pop_context ();
796 if (local_symbols
!= NULL
)
798 finish_block (0, &local_symbols
, new -> old_blocks
, new -> start_addr
,
799 dip
-> at_high_pc
, objfile
);
801 local_symbols
= new -> locals
;
808 lookup_utype -- look up a user defined type from die reference
812 static type *lookup_utype (DIE_REF die_ref)
816 Given a DIE reference, lookup the user defined type associated with
817 that DIE, if it has been registered already. If not registered, then
818 return NULL. Alloc_utype() can be called to register an empty
819 type for this reference, which will be filled in later when the
820 actual referenced DIE is processed.
824 lookup_utype (die_ref
)
827 struct type
*type
= NULL
;
830 utypeidx
= (die_ref
- dbroff
) / 4;
831 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
833 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
837 type
= *(utypes
+ utypeidx
);
847 alloc_utype -- add a user defined type for die reference
851 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
855 Given a die reference DIE_REF, and a possible pointer to a user
856 defined type UTYPEP, register that this reference has a user
857 defined type and either use the specified type in UTYPEP or
858 make a new empty type that will be filled in later.
860 We should only be called after calling lookup_utype() to verify that
861 there is not currently a type registered for DIE_REF.
865 alloc_utype (die_ref
, utypep
)
872 utypeidx
= (die_ref
- dbroff
) / 4;
873 typep
= utypes
+ utypeidx
;
874 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
876 utypep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
877 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
879 else if (*typep
!= NULL
)
882 complain (&dup_user_type_allocation
, DIE_ID
, DIE_NAME
);
888 utypep
= alloc_type (current_objfile
);
899 decode_die_type -- return a type for a specified die
903 static struct type *decode_die_type (struct dieinfo *dip)
907 Given a pointer to a die information structure DIP, decode the
908 type of the die and return a pointer to the decoded type. All
909 dies without specific types default to type int.
913 decode_die_type (dip
)
916 struct type
*type
= NULL
;
918 if (dip
-> at_fund_type
!= 0)
920 type
= decode_fund_type (dip
-> at_fund_type
);
922 else if (dip
-> at_mod_fund_type
!= NULL
)
924 type
= decode_mod_fund_type (dip
-> at_mod_fund_type
);
926 else if (dip
-> at_user_def_type
)
928 if ((type
= lookup_utype (dip
-> at_user_def_type
)) == NULL
)
930 type
= alloc_utype (dip
-> at_user_def_type
, NULL
);
933 else if (dip
-> at_mod_u_d_type
)
935 type
= decode_mod_u_d_type (dip
-> at_mod_u_d_type
);
939 type
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
948 struct_type -- compute and return the type for a struct or union
952 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
953 char *enddie, struct objfile *objfile)
957 Given pointer to a die information structure for a die which
958 defines a union or structure (and MUST define one or the other),
959 and pointers to the raw die data that define the range of dies which
960 define the members, compute and return the user defined type for the
965 struct_type (dip
, thisdie
, enddie
, objfile
)
969 struct objfile
*objfile
;
973 struct nextfield
*next
;
976 struct nextfield
*list
= NULL
;
977 struct nextfield
*new;
984 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
986 /* No forward references created an empty type, so install one now */
987 type
= alloc_utype (dip
-> die_ref
, NULL
);
989 INIT_CPLUS_SPECIFIC(type
);
990 switch (dip
-> die_tag
)
993 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
995 case TAG_structure_type
:
996 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
999 TYPE_CODE (type
) = TYPE_CODE_UNION
;
1002 /* Should never happen */
1003 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
1004 complain (&missing_tag
, DIE_ID
, DIE_NAME
);
1007 /* Some compilers try to be helpful by inventing "fake" names for
1008 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1009 Thanks, but no thanks... */
1010 if (dip
-> at_name
!= NULL
1011 && *dip
-> at_name
!= '~'
1012 && *dip
-> at_name
!= '.')
1014 TYPE_TAG_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1015 "", "", dip
-> at_name
);
1017 /* Use whatever size is known. Zero is a valid size. We might however
1018 wish to check has_at_byte_size to make sure that some byte size was
1019 given explicitly, but DWARF doesn't specify that explicit sizes of
1020 zero have to present, so complaining about missing sizes should
1021 probably not be the default. */
1022 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1023 thisdie
+= dip
-> die_length
;
1024 while (thisdie
< enddie
)
1026 basicdieinfo (&mbr
, thisdie
, objfile
);
1027 completedieinfo (&mbr
, objfile
);
1028 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
1032 else if (mbr
.at_sibling
!= 0)
1034 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
1038 nextdie
= thisdie
+ mbr
.die_length
;
1040 switch (mbr
.die_tag
)
1043 /* Get space to record the next field's data. */
1044 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1047 /* Save the data. */
1048 list
-> field
.name
=
1049 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
1050 &objfile
-> type_obstack
);
1051 list
-> field
.type
= decode_die_type (&mbr
);
1052 list
-> field
.bitpos
= 8 * locval (mbr
.at_location
);
1053 /* Handle bit fields. */
1054 list
-> field
.bitsize
= mbr
.at_bit_size
;
1055 if (BITS_BIG_ENDIAN
)
1057 /* For big endian bits, the at_bit_offset gives the
1058 additional bit offset from the MSB of the containing
1059 anonymous object to the MSB of the field. We don't
1060 have to do anything special since we don't need to
1061 know the size of the anonymous object. */
1062 list
-> field
.bitpos
+= mbr
.at_bit_offset
;
1066 /* For little endian bits, we need to have a non-zero
1067 at_bit_size, so that we know we are in fact dealing
1068 with a bitfield. Compute the bit offset to the MSB
1069 of the anonymous object, subtract off the number of
1070 bits from the MSB of the field to the MSB of the
1071 object, and then subtract off the number of bits of
1072 the field itself. The result is the bit offset of
1073 the LSB of the field. */
1074 if (mbr
.at_bit_size
> 0)
1076 if (mbr
.has_at_byte_size
)
1078 /* The size of the anonymous object containing
1079 the bit field is explicit, so use the
1080 indicated size (in bytes). */
1081 anonymous_size
= mbr
.at_byte_size
;
1085 /* The size of the anonymous object containing
1086 the bit field matches the size of an object
1087 of the bit field's type. DWARF allows
1088 at_byte_size to be left out in such cases, as
1089 a debug information size optimization. */
1090 anonymous_size
= TYPE_LENGTH (list
-> field
.type
);
1092 list
-> field
.bitpos
+=
1093 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
1099 process_dies (thisdie
, nextdie
, objfile
);
1104 /* Now create the vector of fields, and record how big it is. We may
1105 not even have any fields, if this DIE was generated due to a reference
1106 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1107 set, which clues gdb in to the fact that it needs to search elsewhere
1108 for the full structure definition. */
1111 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1115 TYPE_NFIELDS (type
) = nfields
;
1116 TYPE_FIELDS (type
) = (struct field
*)
1117 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1118 /* Copy the saved-up fields into the field vector. */
1119 for (n
= nfields
; list
; list
= list
-> next
)
1121 TYPE_FIELD (type
, --n
) = list
-> field
;
1131 read_structure_scope -- process all dies within struct or union
1135 static void read_structure_scope (struct dieinfo *dip,
1136 char *thisdie, char *enddie, struct objfile *objfile)
1140 Called when we find the DIE that starts a structure or union
1141 scope (definition) to process all dies that define the members
1142 of the structure or union. DIP is a pointer to the die info
1143 struct for the DIE that names the structure or union.
1147 Note that we need to call struct_type regardless of whether or not
1148 the DIE has an at_name attribute, since it might be an anonymous
1149 structure or union. This gets the type entered into our set of
1152 However, if the structure is incomplete (an opaque struct/union)
1153 then suppress creating a symbol table entry for it since gdb only
1154 wants to find the one with the complete definition. Note that if
1155 it is complete, we just call new_symbol, which does it's own
1156 checking about whether the struct/union is anonymous or not (and
1157 suppresses creating a symbol table entry itself).
1162 read_structure_scope (dip
, thisdie
, enddie
, objfile
)
1163 struct dieinfo
*dip
;
1166 struct objfile
*objfile
;
1171 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1172 if (!(TYPE_FLAGS (type
) & TYPE_FLAG_STUB
))
1174 sym
= new_symbol (dip
, objfile
);
1177 SYMBOL_TYPE (sym
) = type
;
1178 if (cu_language
== language_cplus
)
1180 synthesize_typedef (dip
, objfile
, type
);
1190 decode_array_element_type -- decode type of the array elements
1194 static struct type *decode_array_element_type (char *scan, char *end)
1198 As the last step in decoding the array subscript information for an
1199 array DIE, we need to decode the type of the array elements. We are
1200 passed a pointer to this last part of the subscript information and
1201 must return the appropriate type. If the type attribute is not
1202 recognized, just warn about the problem and return type int.
1205 static struct type
*
1206 decode_array_element_type (scan
)
1211 unsigned short attribute
;
1212 unsigned short fundtype
;
1215 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1217 scan
+= SIZEOF_ATTRIBUTE
;
1218 if ((nbytes
= attribute_size (attribute
)) == -1)
1220 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1221 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1228 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1230 typep
= decode_fund_type (fundtype
);
1232 case AT_mod_fund_type
:
1233 typep
= decode_mod_fund_type (scan
);
1235 case AT_user_def_type
:
1236 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1238 if ((typep
= lookup_utype (die_ref
)) == NULL
)
1240 typep
= alloc_utype (die_ref
, NULL
);
1243 case AT_mod_u_d_type
:
1244 typep
= decode_mod_u_d_type (scan
);
1247 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1248 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1259 decode_subscript_data_item -- decode array subscript item
1263 static struct type *
1264 decode_subscript_data_item (char *scan, char *end)
1268 The array subscripts and the data type of the elements of an
1269 array are described by a list of data items, stored as a block
1270 of contiguous bytes. There is a data item describing each array
1271 dimension, and a final data item describing the element type.
1272 The data items are ordered the same as their appearance in the
1273 source (I.E. leftmost dimension first, next to leftmost second,
1276 The data items describing each array dimension consist of four
1277 parts: (1) a format specifier, (2) type type of the subscript
1278 index, (3) a description of the low bound of the array dimension,
1279 and (4) a description of the high bound of the array dimension.
1281 The last data item is the description of the type of each of
1284 We are passed a pointer to the start of the block of bytes
1285 containing the remaining data items, and a pointer to the first
1286 byte past the data. This function recursively decodes the
1287 remaining data items and returns a type.
1289 If we somehow fail to decode some data, we complain about it
1290 and return a type "array of int".
1293 FIXME: This code only implements the forms currently used
1294 by the AT&T and GNU C compilers.
1296 The end pointer is supplied for error checking, maybe we should
1300 static struct type
*
1301 decode_subscript_data_item (scan
, end
)
1305 struct type
*typep
= NULL
; /* Array type we are building */
1306 struct type
*nexttype
; /* Type of each element (may be array) */
1307 struct type
*indextype
; /* Type of this index */
1308 struct type
*rangetype
;
1309 unsigned int format
;
1310 unsigned short fundtype
;
1311 unsigned long lowbound
;
1312 unsigned long highbound
;
1315 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1317 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1321 typep
= decode_array_element_type (scan
);
1324 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1326 indextype
= decode_fund_type (fundtype
);
1327 scan
+= SIZEOF_FMT_FT
;
1328 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1329 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1331 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1333 nexttype
= decode_subscript_data_item (scan
, end
);
1334 if (nexttype
== NULL
)
1336 /* Munged subscript data or other problem, fake it. */
1337 complain (&subscript_data_items
, DIE_ID
, DIE_NAME
);
1338 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1340 rangetype
= create_range_type ((struct type
*) NULL
, indextype
,
1341 lowbound
, highbound
);
1342 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1351 complain (&unhandled_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1352 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1353 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1354 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1357 complain (&unknown_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1358 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1359 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1360 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1370 dwarf_read_array_type -- read TAG_array_type DIE
1374 static void dwarf_read_array_type (struct dieinfo *dip)
1378 Extract all information from a TAG_array_type DIE and add to
1379 the user defined type vector.
1383 dwarf_read_array_type (dip
)
1384 struct dieinfo
*dip
;
1390 unsigned short blocksz
;
1393 if (dip
-> at_ordering
!= ORD_row_major
)
1395 /* FIXME: Can gdb even handle column major arrays? */
1396 complain (¬_row_major
, DIE_ID
, DIE_NAME
);
1398 if ((sub
= dip
-> at_subscr_data
) != NULL
)
1400 nbytes
= attribute_size (AT_subscr_data
);
1401 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1402 subend
= sub
+ nbytes
+ blocksz
;
1404 type
= decode_subscript_data_item (sub
, subend
);
1405 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1407 /* Install user defined type that has not been referenced yet. */
1408 alloc_utype (dip
-> die_ref
, type
);
1410 else if (TYPE_CODE (utype
) == TYPE_CODE_UNDEF
)
1412 /* Ick! A forward ref has already generated a blank type in our
1413 slot, and this type probably already has things pointing to it
1414 (which is what caused it to be created in the first place).
1415 If it's just a place holder we can plop our fully defined type
1416 on top of it. We can't recover the space allocated for our
1417 new type since it might be on an obstack, but we could reuse
1418 it if we kept a list of them, but it might not be worth it
1424 /* Double ick! Not only is a type already in our slot, but
1425 someone has decorated it. Complain and leave it alone. */
1426 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1435 read_tag_pointer_type -- read TAG_pointer_type DIE
1439 static void read_tag_pointer_type (struct dieinfo *dip)
1443 Extract all information from a TAG_pointer_type DIE and add to
1444 the user defined type vector.
1448 read_tag_pointer_type (dip
)
1449 struct dieinfo
*dip
;
1454 type
= decode_die_type (dip
);
1455 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1457 utype
= lookup_pointer_type (type
);
1458 alloc_utype (dip
-> die_ref
, utype
);
1462 TYPE_TARGET_TYPE (utype
) = type
;
1463 TYPE_POINTER_TYPE (type
) = utype
;
1465 /* We assume the machine has only one representation for pointers! */
1466 /* FIXME: This confuses host<->target data representations, and is a
1467 poor assumption besides. */
1469 TYPE_LENGTH (utype
) = sizeof (char *);
1470 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1478 read_tag_string_type -- read TAG_string_type DIE
1482 static void read_tag_string_type (struct dieinfo *dip)
1486 Extract all information from a TAG_string_type DIE and add to
1487 the user defined type vector. It isn't really a user defined
1488 type, but it behaves like one, with other DIE's using an
1489 AT_user_def_type attribute to reference it.
1493 read_tag_string_type (dip
)
1494 struct dieinfo
*dip
;
1497 struct type
*indextype
;
1498 struct type
*rangetype
;
1499 unsigned long lowbound
= 0;
1500 unsigned long highbound
;
1502 if (dip
-> has_at_byte_size
)
1504 /* A fixed bounds string */
1505 highbound
= dip
-> at_byte_size
- 1;
1509 /* A varying length string. Stub for now. (FIXME) */
1512 indextype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1513 rangetype
= create_range_type ((struct type
*) NULL
, indextype
, lowbound
,
1516 utype
= lookup_utype (dip
-> die_ref
);
1519 /* No type defined, go ahead and create a blank one to use. */
1520 utype
= alloc_utype (dip
-> die_ref
, (struct type
*) NULL
);
1524 /* Already a type in our slot due to a forward reference. Make sure it
1525 is a blank one. If not, complain and leave it alone. */
1526 if (TYPE_CODE (utype
) != TYPE_CODE_UNDEF
)
1528 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1533 /* Create the string type using the blank type we either found or created. */
1534 utype
= create_string_type (utype
, rangetype
);
1541 read_subroutine_type -- process TAG_subroutine_type dies
1545 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1550 Handle DIES due to C code like:
1553 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1559 The parameter DIES are currently ignored. See if gdb has a way to
1560 include this info in it's type system, and decode them if so. Is
1561 this what the type structure's "arg_types" field is for? (FIXME)
1565 read_subroutine_type (dip
, thisdie
, enddie
)
1566 struct dieinfo
*dip
;
1570 struct type
*type
; /* Type that this function returns */
1571 struct type
*ftype
; /* Function that returns above type */
1573 /* Decode the type that this subroutine returns */
1575 type
= decode_die_type (dip
);
1577 /* Check to see if we already have a partially constructed user
1578 defined type for this DIE, from a forward reference. */
1580 if ((ftype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1582 /* This is the first reference to one of these types. Make
1583 a new one and place it in the user defined types. */
1584 ftype
= lookup_function_type (type
);
1585 alloc_utype (dip
-> die_ref
, ftype
);
1587 else if (TYPE_CODE (ftype
) == TYPE_CODE_UNDEF
)
1589 /* We have an existing partially constructed type, so bash it
1590 into the correct type. */
1591 TYPE_TARGET_TYPE (ftype
) = type
;
1592 TYPE_LENGTH (ftype
) = 1;
1593 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1597 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1605 read_enumeration -- process dies which define an enumeration
1609 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1610 char *enddie, struct objfile *objfile)
1614 Given a pointer to a die which begins an enumeration, process all
1615 the dies that define the members of the enumeration.
1619 Note that we need to call enum_type regardless of whether or not we
1620 have a symbol, since we might have an enum without a tag name (thus
1621 no symbol for the tagname).
1625 read_enumeration (dip
, thisdie
, enddie
, objfile
)
1626 struct dieinfo
*dip
;
1629 struct objfile
*objfile
;
1634 type
= enum_type (dip
, objfile
);
1635 sym
= new_symbol (dip
, objfile
);
1638 SYMBOL_TYPE (sym
) = type
;
1639 if (cu_language
== language_cplus
)
1641 synthesize_typedef (dip
, objfile
, type
);
1650 enum_type -- decode and return a type for an enumeration
1654 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1658 Given a pointer to a die information structure for the die which
1659 starts an enumeration, process all the dies that define the members
1660 of the enumeration and return a type pointer for the enumeration.
1662 At the same time, for each member of the enumeration, create a
1663 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1664 and give it the type of the enumeration itself.
1668 Note that the DWARF specification explicitly mandates that enum
1669 constants occur in reverse order from the source program order,
1670 for "consistency" and because this ordering is easier for many
1671 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1672 Entries). Because gdb wants to see the enum members in program
1673 source order, we have to ensure that the order gets reversed while
1674 we are processing them.
1677 static struct type
*
1678 enum_type (dip
, objfile
)
1679 struct dieinfo
*dip
;
1680 struct objfile
*objfile
;
1684 struct nextfield
*next
;
1687 struct nextfield
*list
= NULL
;
1688 struct nextfield
*new;
1693 unsigned short blocksz
;
1697 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1699 /* No forward references created an empty type, so install one now */
1700 type
= alloc_utype (dip
-> die_ref
, NULL
);
1702 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1703 /* Some compilers try to be helpful by inventing "fake" names for
1704 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1705 Thanks, but no thanks... */
1706 if (dip
-> at_name
!= NULL
1707 && *dip
-> at_name
!= '~'
1708 && *dip
-> at_name
!= '.')
1710 TYPE_TAG_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1711 "", "", dip
-> at_name
);
1713 if (dip
-> at_byte_size
!= 0)
1715 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1717 if ((scan
= dip
-> at_element_list
) != NULL
)
1719 if (dip
-> short_element_list
)
1721 nbytes
= attribute_size (AT_short_element_list
);
1725 nbytes
= attribute_size (AT_element_list
);
1727 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1728 listend
= scan
+ nbytes
+ blocksz
;
1730 while (scan
< listend
)
1732 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1735 list
-> field
.type
= NULL
;
1736 list
-> field
.bitsize
= 0;
1737 list
-> field
.bitpos
=
1738 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1740 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1741 list
-> field
.name
= obsavestring (scan
, strlen (scan
),
1742 &objfile
-> type_obstack
);
1743 scan
+= strlen (scan
) + 1;
1745 /* Handcraft a new symbol for this enum member. */
1746 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1747 sizeof (struct symbol
));
1748 memset (sym
, 0, sizeof (struct symbol
));
1749 SYMBOL_NAME (sym
) = create_name (list
-> field
.name
,
1750 &objfile
->symbol_obstack
);
1751 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
1752 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1753 SYMBOL_CLASS (sym
) = LOC_CONST
;
1754 SYMBOL_TYPE (sym
) = type
;
1755 SYMBOL_VALUE (sym
) = list
-> field
.bitpos
;
1756 add_symbol_to_list (sym
, list_in_scope
);
1758 /* Now create the vector of fields, and record how big it is. This is
1759 where we reverse the order, by pulling the members off the list in
1760 reverse order from how they were inserted. If we have no fields
1761 (this is apparently possible in C++) then skip building a field
1765 TYPE_NFIELDS (type
) = nfields
;
1766 TYPE_FIELDS (type
) = (struct field
*)
1767 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1768 /* Copy the saved-up fields into the field vector. */
1769 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
-> next
)
1771 TYPE_FIELD (type
, n
++) = list
-> field
;
1782 read_func_scope -- process all dies within a function scope
1786 Process all dies within a given function scope. We are passed
1787 a die information structure pointer DIP for the die which
1788 starts the function scope, and pointers into the raw die data
1789 that define the dies within the function scope.
1791 For now, we ignore lexical block scopes within the function.
1792 The problem is that AT&T cc does not define a DWARF lexical
1793 block scope for the function itself, while gcc defines a
1794 lexical block scope for the function. We need to think about
1795 how to handle this difference, or if it is even a problem.
1800 read_func_scope (dip
, thisdie
, enddie
, objfile
)
1801 struct dieinfo
*dip
;
1804 struct objfile
*objfile
;
1806 register struct context_stack
*new;
1808 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1809 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1811 objfile
-> ei
.entry_func_lowpc
= dip
-> at_low_pc
;
1812 objfile
-> ei
.entry_func_highpc
= dip
-> at_high_pc
;
1814 if (STREQ (dip
-> at_name
, "main")) /* FIXME: hardwired name */
1816 objfile
-> ei
.main_func_lowpc
= dip
-> at_low_pc
;
1817 objfile
-> ei
.main_func_highpc
= dip
-> at_high_pc
;
1819 new = push_context (0, dip
-> at_low_pc
);
1820 new -> name
= new_symbol (dip
, objfile
);
1821 list_in_scope
= &local_symbols
;
1822 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1823 new = pop_context ();
1824 /* Make a block for the local symbols within. */
1825 finish_block (new -> name
, &local_symbols
, new -> old_blocks
,
1826 new -> start_addr
, dip
-> at_high_pc
, objfile
);
1827 list_in_scope
= &file_symbols
;
1835 handle_producer -- process the AT_producer attribute
1839 Perform any operations that depend on finding a particular
1840 AT_producer attribute.
1845 handle_producer (producer
)
1849 /* If this compilation unit was compiled with g++ or gcc, then set the
1850 processing_gcc_compilation flag. */
1852 processing_gcc_compilation
=
1853 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
))
1854 || STREQN (producer
, CHILL_PRODUCER
, strlen (CHILL_PRODUCER
))
1855 || STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
));
1857 /* Select a demangling style if we can identify the producer and if
1858 the current style is auto. We leave the current style alone if it
1859 is not auto. We also leave the demangling style alone if we find a
1860 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1862 if (AUTO_DEMANGLING
)
1864 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1866 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1868 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1870 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1880 read_file_scope -- process all dies within a file scope
1884 Process all dies within a given file scope. We are passed a
1885 pointer to the die information structure for the die which
1886 starts the file scope, and pointers into the raw die data which
1887 mark the range of dies within the file scope.
1889 When the partial symbol table is built, the file offset for the line
1890 number table for each compilation unit is saved in the partial symbol
1891 table entry for that compilation unit. As the symbols for each
1892 compilation unit are read, the line number table is read into memory
1893 and the variable lnbase is set to point to it. Thus all we have to
1894 do is use lnbase to access the line number table for the current
1899 read_file_scope (dip
, thisdie
, enddie
, objfile
)
1900 struct dieinfo
*dip
;
1903 struct objfile
*objfile
;
1905 struct cleanup
*back_to
;
1906 struct symtab
*symtab
;
1908 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1909 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1911 objfile
-> ei
.entry_file_lowpc
= dip
-> at_low_pc
;
1912 objfile
-> ei
.entry_file_highpc
= dip
-> at_high_pc
;
1914 set_cu_language (dip
);
1915 if (dip
-> at_producer
!= NULL
)
1917 handle_producer (dip
-> at_producer
);
1919 numutypes
= (enddie
- thisdie
) / 4;
1920 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1921 back_to
= make_cleanup (free
, utypes
);
1922 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1923 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1924 start_symtab (dip
-> at_name
, dip
-> at_comp_dir
, dip
-> at_low_pc
);
1925 decode_line_numbers (lnbase
);
1926 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1928 symtab
= end_symtab (dip
-> at_high_pc
, 0, 0, objfile
, 0);
1931 symtab
-> language
= cu_language
;
1933 do_cleanups (back_to
);
1942 process_dies -- process a range of DWARF Information Entries
1946 static void process_dies (char *thisdie, char *enddie,
1947 struct objfile *objfile)
1951 Process all DIE's in a specified range. May be (and almost
1952 certainly will be) called recursively.
1956 process_dies (thisdie
, enddie
, objfile
)
1959 struct objfile
*objfile
;
1964 while (thisdie
< enddie
)
1966 basicdieinfo (&di
, thisdie
, objfile
);
1967 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1971 else if (di
.die_tag
== TAG_padding
)
1973 nextdie
= thisdie
+ di
.die_length
;
1977 completedieinfo (&di
, objfile
);
1978 if (di
.at_sibling
!= 0)
1980 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1984 nextdie
= thisdie
+ di
.die_length
;
1986 #ifdef SMASH_TEXT_ADDRESS
1987 /* I think that these are always text, not data, addresses. */
1988 SMASH_TEXT_ADDRESS (di
.at_low_pc
);
1989 SMASH_TEXT_ADDRESS (di
.at_high_pc
);
1993 case TAG_compile_unit
:
1994 /* Skip Tag_compile_unit if we are already inside a compilation
1995 unit, we are unable to handle nested compilation units
1996 properly (FIXME). */
1997 if (current_subfile
== NULL
)
1998 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
2000 nextdie
= thisdie
+ di
.die_length
;
2002 case TAG_global_subroutine
:
2003 case TAG_subroutine
:
2004 if (di
.has_at_low_pc
)
2006 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
2009 case TAG_lexical_block
:
2010 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
2012 case TAG_class_type
:
2013 case TAG_structure_type
:
2014 case TAG_union_type
:
2015 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
2017 case TAG_enumeration_type
:
2018 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
2020 case TAG_subroutine_type
:
2021 read_subroutine_type (&di
, thisdie
, nextdie
);
2023 case TAG_array_type
:
2024 dwarf_read_array_type (&di
);
2026 case TAG_pointer_type
:
2027 read_tag_pointer_type (&di
);
2029 case TAG_string_type
:
2030 read_tag_string_type (&di
);
2033 new_symbol (&di
, objfile
);
2045 decode_line_numbers -- decode a line number table fragment
2049 static void decode_line_numbers (char *tblscan, char *tblend,
2050 long length, long base, long line, long pc)
2054 Translate the DWARF line number information to gdb form.
2056 The ".line" section contains one or more line number tables, one for
2057 each ".line" section from the objects that were linked.
2059 The AT_stmt_list attribute for each TAG_source_file entry in the
2060 ".debug" section contains the offset into the ".line" section for the
2061 start of the table for that file.
2063 The table itself has the following structure:
2065 <table length><base address><source statement entry>
2066 4 bytes 4 bytes 10 bytes
2068 The table length is the total size of the table, including the 4 bytes
2069 for the length information.
2071 The base address is the address of the first instruction generated
2072 for the source file.
2074 Each source statement entry has the following structure:
2076 <line number><statement position><address delta>
2077 4 bytes 2 bytes 4 bytes
2079 The line number is relative to the start of the file, starting with
2082 The statement position either -1 (0xFFFF) or the number of characters
2083 from the beginning of the line to the beginning of the statement.
2085 The address delta is the difference between the base address and
2086 the address of the first instruction for the statement.
2088 Note that we must copy the bytes from the packed table to our local
2089 variables before attempting to use them, to avoid alignment problems
2090 on some machines, particularly RISC processors.
2094 Does gdb expect the line numbers to be sorted? They are now by
2095 chance/luck, but are not required to be. (FIXME)
2097 The line with number 0 is unused, gdb apparently can discover the
2098 span of the last line some other way. How? (FIXME)
2102 decode_line_numbers (linetable
)
2107 unsigned long length
;
2112 if (linetable
!= NULL
)
2114 tblscan
= tblend
= linetable
;
2115 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2117 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2119 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2120 GET_UNSIGNED
, current_objfile
);
2121 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2123 while (tblscan
< tblend
)
2125 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2127 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2128 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2130 tblscan
+= SIZEOF_LINETBL_DELTA
;
2134 record_line (current_subfile
, line
, pc
);
2144 locval -- compute the value of a location attribute
2148 static int locval (char *loc)
2152 Given pointer to a string of bytes that define a location, compute
2153 the location and return the value.
2155 When computing values involving the current value of the frame pointer,
2156 the value zero is used, which results in a value relative to the frame
2157 pointer, rather than the absolute value. This is what GDB wants
2160 When the result is a register number, the global isreg flag is set,
2161 otherwise it is cleared. This is a kludge until we figure out a better
2162 way to handle the problem. Gdb's design does not mesh well with the
2163 DWARF notion of a location computing interpreter, which is a shame
2164 because the flexibility goes unused.
2168 Note that stack[0] is unused except as a default error return.
2169 Note that stack overflow is not yet handled.
2176 unsigned short nbytes
;
2177 unsigned short locsize
;
2178 auto long stack
[64];
2184 nbytes
= attribute_size (AT_location
);
2185 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2187 end
= loc
+ locsize
;
2192 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2195 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2197 loc
+= SIZEOF_LOC_ATOM_CODE
;
2198 switch (loc_atom_code
)
2205 /* push register (number) */
2207 = DWARF_REG_TO_REGNUM (target_to_host (loc
, loc_value_size
,
2210 loc
+= loc_value_size
;
2214 /* push value of register (number) */
2215 /* Actually, we compute the value as if register has 0, so the
2216 value ends up being the offset from that register. */
2218 basereg
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2220 loc
+= loc_value_size
;
2221 stack
[++stacki
] = 0;
2224 /* push address (relocated address) */
2225 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2226 GET_UNSIGNED
, current_objfile
);
2227 loc
+= loc_value_size
;
2230 /* push constant (number) FIXME: signed or unsigned! */
2231 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2232 GET_SIGNED
, current_objfile
);
2233 loc
+= loc_value_size
;
2236 /* pop, deref and push 2 bytes (as a long) */
2237 complain (&op_deref2
, DIE_ID
, DIE_NAME
, stack
[stacki
]);
2239 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2240 complain (&op_deref4
, DIE_ID
, DIE_NAME
, stack
[stacki
]);
2242 case OP_ADD
: /* pop top 2 items, add, push result */
2243 stack
[stacki
- 1] += stack
[stacki
];
2248 return (stack
[stacki
]);
2255 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2259 static void read_ofile_symtab (struct partial_symtab *pst)
2263 When expanding a partial symbol table entry to a full symbol table
2264 entry, this is the function that gets called to read in the symbols
2265 for the compilation unit. A pointer to the newly constructed symtab,
2266 which is now the new first one on the objfile's symtab list, is
2267 stashed in the partial symbol table entry.
2271 read_ofile_symtab (pst
)
2272 struct partial_symtab
*pst
;
2274 struct cleanup
*back_to
;
2275 unsigned long lnsize
;
2278 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2280 abfd
= pst
-> objfile
-> obfd
;
2281 current_objfile
= pst
-> objfile
;
2283 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2284 unit, seek to the location in the file, and read in all the DIE's. */
2287 dbsize
= DBLENGTH (pst
);
2288 dbbase
= xmalloc (dbsize
);
2289 dbroff
= DBROFF(pst
);
2290 foffset
= DBFOFF(pst
) + dbroff
;
2291 base_section_offsets
= pst
->section_offsets
;
2292 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2293 if (bfd_seek (abfd
, foffset
, L_SET
) ||
2294 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
2297 error ("can't read DWARF data");
2299 back_to
= make_cleanup (free
, dbbase
);
2301 /* If there is a line number table associated with this compilation unit
2302 then read the size of this fragment in bytes, from the fragment itself.
2303 Allocate a buffer for the fragment and read it in for future
2309 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2310 (bfd_read ((PTR
) lnsizedata
, sizeof (lnsizedata
), 1, abfd
) !=
2311 sizeof (lnsizedata
)))
2313 error ("can't read DWARF line number table size");
2315 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2316 GET_UNSIGNED
, pst
-> objfile
);
2317 lnbase
= xmalloc (lnsize
);
2318 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2319 (bfd_read (lnbase
, lnsize
, 1, abfd
) != lnsize
))
2322 error ("can't read DWARF line numbers");
2324 make_cleanup (free
, lnbase
);
2327 process_dies (dbbase
, dbbase
+ dbsize
, pst
-> objfile
);
2328 do_cleanups (back_to
);
2329 current_objfile
= NULL
;
2330 pst
-> symtab
= pst
-> objfile
-> symtabs
;
2337 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2341 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2345 Called once for each partial symbol table entry that needs to be
2346 expanded into a full symbol table entry.
2351 psymtab_to_symtab_1 (pst
)
2352 struct partial_symtab
*pst
;
2355 struct cleanup
*old_chain
;
2361 warning ("psymtab for %s already read in. Shouldn't happen.",
2366 /* Read in all partial symtabs on which this one is dependent */
2367 for (i
= 0; i
< pst
-> number_of_dependencies
; i
++)
2369 if (!pst
-> dependencies
[i
] -> readin
)
2371 /* Inform about additional files that need to be read in. */
2374 fputs_filtered (" ", gdb_stdout
);
2376 fputs_filtered ("and ", gdb_stdout
);
2378 printf_filtered ("%s...",
2379 pst
-> dependencies
[i
] -> filename
);
2381 gdb_flush (gdb_stdout
); /* Flush output */
2383 psymtab_to_symtab_1 (pst
-> dependencies
[i
]);
2386 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2389 old_chain
= make_cleanup (really_free_pendings
, 0);
2390 read_ofile_symtab (pst
);
2393 printf_filtered ("%d DIE's, sorting...", diecount
);
2395 gdb_flush (gdb_stdout
);
2397 sort_symtab_syms (pst
-> symtab
);
2398 do_cleanups (old_chain
);
2409 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2413 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2417 This is the DWARF support entry point for building a full symbol
2418 table entry from a partial symbol table entry. We are passed a
2419 pointer to the partial symbol table entry that needs to be expanded.
2424 dwarf_psymtab_to_symtab (pst
)
2425 struct partial_symtab
*pst
;
2432 warning ("psymtab for %s already read in. Shouldn't happen.",
2437 if (DBLENGTH (pst
) || pst
-> number_of_dependencies
)
2439 /* Print the message now, before starting serious work, to avoid
2440 disconcerting pauses. */
2443 printf_filtered ("Reading in symbols for %s...",
2445 gdb_flush (gdb_stdout
);
2448 psymtab_to_symtab_1 (pst
);
2450 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2451 we need to do an equivalent or is this something peculiar to
2453 Match with global symbols. This only needs to be done once,
2454 after all of the symtabs and dependencies have been read in.
2456 scan_file_globals (pst
-> objfile
);
2459 /* Finish up the verbose info message. */
2462 printf_filtered ("done.\n");
2463 gdb_flush (gdb_stdout
);
2474 add_enum_psymbol -- add enumeration members to partial symbol table
2478 Given pointer to a DIE that is known to be for an enumeration,
2479 extract the symbolic names of the enumeration members and add
2480 partial symbols for them.
2484 add_enum_psymbol (dip
, objfile
)
2485 struct dieinfo
*dip
;
2486 struct objfile
*objfile
;
2490 unsigned short blocksz
;
2493 if ((scan
= dip
-> at_element_list
) != NULL
)
2495 if (dip
-> short_element_list
)
2497 nbytes
= attribute_size (AT_short_element_list
);
2501 nbytes
= attribute_size (AT_element_list
);
2503 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2505 listend
= scan
+ blocksz
;
2506 while (scan
< listend
)
2508 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2509 ADD_PSYMBOL_TO_LIST (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2510 objfile
-> static_psymbols
, 0, cu_language
,
2512 scan
+= strlen (scan
) + 1;
2521 add_partial_symbol -- add symbol to partial symbol table
2525 Given a DIE, if it is one of the types that we want to
2526 add to a partial symbol table, finish filling in the die info
2527 and then add a partial symbol table entry for it.
2531 The caller must ensure that the DIE has a valid name attribute.
2535 add_partial_symbol (dip
, objfile
)
2536 struct dieinfo
*dip
;
2537 struct objfile
*objfile
;
2539 switch (dip
-> die_tag
)
2541 case TAG_global_subroutine
:
2542 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2543 VAR_NAMESPACE
, LOC_BLOCK
,
2544 objfile
-> global_psymbols
,
2545 dip
-> at_low_pc
, cu_language
, objfile
);
2547 case TAG_global_variable
:
2548 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2549 VAR_NAMESPACE
, LOC_STATIC
,
2550 objfile
-> global_psymbols
,
2551 0, cu_language
, objfile
);
2553 case TAG_subroutine
:
2554 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2555 VAR_NAMESPACE
, LOC_BLOCK
,
2556 objfile
-> static_psymbols
,
2557 dip
-> at_low_pc
, cu_language
, objfile
);
2559 case TAG_local_variable
:
2560 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2561 VAR_NAMESPACE
, LOC_STATIC
,
2562 objfile
-> static_psymbols
,
2563 0, cu_language
, objfile
);
2566 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2567 VAR_NAMESPACE
, LOC_TYPEDEF
,
2568 objfile
-> static_psymbols
,
2569 0, cu_language
, objfile
);
2571 case TAG_class_type
:
2572 case TAG_structure_type
:
2573 case TAG_union_type
:
2574 case TAG_enumeration_type
:
2575 /* Do not add opaque aggregate definitions to the psymtab. */
2576 if (!dip
-> has_at_byte_size
)
2578 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2579 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2580 objfile
-> static_psymbols
,
2581 0, cu_language
, objfile
);
2582 if (cu_language
== language_cplus
)
2584 /* For C++, these implicitly act as typedefs as well. */
2585 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2586 VAR_NAMESPACE
, LOC_TYPEDEF
,
2587 objfile
-> static_psymbols
,
2588 0, cu_language
, objfile
);
2598 scan_partial_symbols -- scan DIE's within a single compilation unit
2602 Process the DIE's within a single compilation unit, looking for
2603 interesting DIE's that contribute to the partial symbol table entry
2604 for this compilation unit.
2608 There are some DIE's that may appear both at file scope and within
2609 the scope of a function. We are only interested in the ones at file
2610 scope, and the only way to tell them apart is to keep track of the
2611 scope. For example, consider the test case:
2616 for which the relevant DWARF segment has the structure:
2619 0x23 global subrtn sibling 0x9b
2621 fund_type FT_integer
2626 0x23 local var sibling 0x97
2628 fund_type FT_integer
2629 location OP_BASEREG 0xe
2636 0x1d local var sibling 0xb8
2638 fund_type FT_integer
2639 location OP_ADDR 0x800025dc
2644 We want to include the symbol 'i' in the partial symbol table, but
2645 not the symbol 'j'. In essence, we want to skip all the dies within
2646 the scope of a TAG_global_subroutine DIE.
2648 Don't attempt to add anonymous structures or unions since they have
2649 no name. Anonymous enumerations however are processed, because we
2650 want to extract their member names (the check for a tag name is
2653 Also, for variables and subroutines, check that this is the place
2654 where the actual definition occurs, rather than just a reference
2659 scan_partial_symbols (thisdie
, enddie
, objfile
)
2662 struct objfile
*objfile
;
2668 while (thisdie
< enddie
)
2670 basicdieinfo (&di
, thisdie
, objfile
);
2671 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2677 nextdie
= thisdie
+ di
.die_length
;
2678 /* To avoid getting complete die information for every die, we
2679 only do it (below) for the cases we are interested in. */
2682 case TAG_global_subroutine
:
2683 case TAG_subroutine
:
2684 completedieinfo (&di
, objfile
);
2685 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2687 add_partial_symbol (&di
, objfile
);
2688 /* If there is a sibling attribute, adjust the nextdie
2689 pointer to skip the entire scope of the subroutine.
2690 Apply some sanity checking to make sure we don't
2691 overrun or underrun the range of remaining DIE's */
2692 if (di
.at_sibling
!= 0)
2694 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2695 if ((temp
< thisdie
) || (temp
>= enddie
))
2697 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
,
2707 case TAG_global_variable
:
2708 case TAG_local_variable
:
2709 completedieinfo (&di
, objfile
);
2710 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2712 add_partial_symbol (&di
, objfile
);
2716 case TAG_class_type
:
2717 case TAG_structure_type
:
2718 case TAG_union_type
:
2719 completedieinfo (&di
, objfile
);
2722 add_partial_symbol (&di
, objfile
);
2725 case TAG_enumeration_type
:
2726 completedieinfo (&di
, objfile
);
2729 add_partial_symbol (&di
, objfile
);
2731 add_enum_psymbol (&di
, objfile
);
2743 scan_compilation_units -- build a psymtab entry for each compilation
2747 This is the top level dwarf parsing routine for building partial
2750 It scans from the beginning of the DWARF table looking for the first
2751 TAG_compile_unit DIE, and then follows the sibling chain to locate
2752 each additional TAG_compile_unit DIE.
2754 For each TAG_compile_unit DIE it creates a partial symtab structure,
2755 calls a subordinate routine to collect all the compilation unit's
2756 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2757 new partial symtab structure into the partial symbol table. It also
2758 records the appropriate information in the partial symbol table entry
2759 to allow the chunk of DIE's and line number table for this compilation
2760 unit to be located and re-read later, to generate a complete symbol
2761 table entry for the compilation unit.
2763 Thus it effectively partitions up a chunk of DIE's for multiple
2764 compilation units into smaller DIE chunks and line number tables,
2765 and associates them with a partial symbol table entry.
2769 If any compilation unit has no line number table associated with
2770 it for some reason (a missing at_stmt_list attribute, rather than
2771 just one with a value of zero, which is valid) then we ensure that
2772 the recorded file offset is zero so that the routine which later
2773 reads line number table fragments knows that there is no fragment
2783 scan_compilation_units (thisdie
, enddie
, dbfoff
, lnoffset
, objfile
)
2788 struct objfile
*objfile
;
2792 struct partial_symtab
*pst
;
2795 file_ptr curlnoffset
;
2797 while (thisdie
< enddie
)
2799 basicdieinfo (&di
, thisdie
, objfile
);
2800 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2804 else if (di
.die_tag
!= TAG_compile_unit
)
2806 nextdie
= thisdie
+ di
.die_length
;
2810 completedieinfo (&di
, objfile
);
2811 set_cu_language (&di
);
2812 if (di
.at_sibling
!= 0)
2814 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2818 nextdie
= thisdie
+ di
.die_length
;
2820 curoff
= thisdie
- dbbase
;
2821 culength
= nextdie
- thisdie
;
2822 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2824 /* First allocate a new partial symbol table structure */
2826 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2827 di
.at_name
, di
.at_low_pc
,
2828 objfile
-> global_psymbols
.next
,
2829 objfile
-> static_psymbols
.next
);
2831 pst
-> texthigh
= di
.at_high_pc
;
2832 pst
-> read_symtab_private
= (char *)
2833 obstack_alloc (&objfile
-> psymbol_obstack
,
2834 sizeof (struct dwfinfo
));
2835 DBFOFF (pst
) = dbfoff
;
2836 DBROFF (pst
) = curoff
;
2837 DBLENGTH (pst
) = culength
;
2838 LNFOFF (pst
) = curlnoffset
;
2839 pst
-> read_symtab
= dwarf_psymtab_to_symtab
;
2841 /* Now look for partial symbols */
2843 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2845 pst
-> n_global_syms
= objfile
-> global_psymbols
.next
-
2846 (objfile
-> global_psymbols
.list
+ pst
-> globals_offset
);
2847 pst
-> n_static_syms
= objfile
-> static_psymbols
.next
-
2848 (objfile
-> static_psymbols
.list
+ pst
-> statics_offset
);
2849 sort_pst_symbols (pst
);
2850 /* If there is already a psymtab or symtab for a file of this name,
2851 remove it. (If there is a symtab, more drastic things also
2852 happen.) This happens in VxWorks. */
2853 free_named_symtabs (pst
-> filename
);
2863 new_symbol -- make a symbol table entry for a new symbol
2867 static struct symbol *new_symbol (struct dieinfo *dip,
2868 struct objfile *objfile)
2872 Given a pointer to a DWARF information entry, figure out if we need
2873 to make a symbol table entry for it, and if so, create a new entry
2874 and return a pointer to it.
2877 static struct symbol
*
2878 new_symbol (dip
, objfile
)
2879 struct dieinfo
*dip
;
2880 struct objfile
*objfile
;
2882 struct symbol
*sym
= NULL
;
2884 if (dip
-> at_name
!= NULL
)
2886 sym
= (struct symbol
*) obstack_alloc (&objfile
-> symbol_obstack
,
2887 sizeof (struct symbol
));
2888 memset (sym
, 0, sizeof (struct symbol
));
2889 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2890 &objfile
->symbol_obstack
);
2891 /* default assumptions */
2892 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2893 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2894 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2896 /* If this symbol is from a C++ compilation, then attempt to cache the
2897 demangled form for future reference. This is a typical time versus
2898 space tradeoff, that was decided in favor of time because it sped up
2899 C++ symbol lookups by a factor of about 20. */
2901 SYMBOL_LANGUAGE (sym
) = cu_language
;
2902 SYMBOL_INIT_DEMANGLED_NAME (sym
, &objfile
-> symbol_obstack
);
2903 switch (dip
-> die_tag
)
2906 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2907 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2909 case TAG_global_subroutine
:
2910 case TAG_subroutine
:
2911 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2912 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2913 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2914 if (dip
-> die_tag
== TAG_global_subroutine
)
2916 add_symbol_to_list (sym
, &global_symbols
);
2920 add_symbol_to_list (sym
, list_in_scope
);
2923 case TAG_global_variable
:
2924 if (dip
-> at_location
!= NULL
)
2926 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2927 add_symbol_to_list (sym
, &global_symbols
);
2928 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2929 SYMBOL_VALUE (sym
) += baseaddr
;
2932 case TAG_local_variable
:
2933 if (dip
-> at_location
!= NULL
)
2935 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2936 add_symbol_to_list (sym
, list_in_scope
);
2939 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2943 SYMBOL_CLASS (sym
) = LOC_BASEREG
;
2944 SYMBOL_BASEREG (sym
) = basereg
;
2948 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2949 SYMBOL_VALUE (sym
) += baseaddr
;
2953 case TAG_formal_parameter
:
2954 if (dip
-> at_location
!= NULL
)
2956 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2958 add_symbol_to_list (sym
, list_in_scope
);
2961 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
2965 SYMBOL_CLASS (sym
) = LOC_BASEREG_ARG
;
2966 SYMBOL_BASEREG (sym
) = basereg
;
2970 SYMBOL_CLASS (sym
) = LOC_ARG
;
2973 case TAG_unspecified_parameters
:
2974 /* From varargs functions; gdb doesn't seem to have any interest in
2975 this information, so just ignore it for now. (FIXME?) */
2977 case TAG_class_type
:
2978 case TAG_structure_type
:
2979 case TAG_union_type
:
2980 case TAG_enumeration_type
:
2981 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2982 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
2983 add_symbol_to_list (sym
, list_in_scope
);
2986 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2987 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2988 add_symbol_to_list (sym
, list_in_scope
);
2991 /* Not a tag we recognize. Hopefully we aren't processing trash
2992 data, but since we must specifically ignore things we don't
2993 recognize, there is nothing else we should do at this point. */
3004 synthesize_typedef -- make a symbol table entry for a "fake" typedef
3008 static void synthesize_typedef (struct dieinfo *dip,
3009 struct objfile *objfile,
3014 Given a pointer to a DWARF information entry, synthesize a typedef
3015 for the name in the DIE, using the specified type.
3017 This is used for C++ class, structs, unions, and enumerations to
3018 set up the tag name as a type.
3023 synthesize_typedef (dip
, objfile
, type
)
3024 struct dieinfo
*dip
;
3025 struct objfile
*objfile
;
3028 struct symbol
*sym
= NULL
;
3030 if (dip
-> at_name
!= NULL
)
3032 sym
= (struct symbol
*)
3033 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symbol
));
3034 memset (sym
, 0, sizeof (struct symbol
));
3035 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
3036 &objfile
->symbol_obstack
);
3037 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
3038 SYMBOL_TYPE (sym
) = type
;
3039 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3040 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3041 add_symbol_to_list (sym
, list_in_scope
);
3049 decode_mod_fund_type -- decode a modified fundamental type
3053 static struct type *decode_mod_fund_type (char *typedata)
3057 Decode a block of data containing a modified fundamental
3058 type specification. TYPEDATA is a pointer to the block,
3059 which starts with a length containing the size of the rest
3060 of the block. At the end of the block is a fundmental type
3061 code value that gives the fundamental type. Everything
3062 in between are type modifiers.
3064 We simply compute the number of modifiers and call the general
3065 function decode_modified_type to do the actual work.
3068 static struct type
*
3069 decode_mod_fund_type (typedata
)
3072 struct type
*typep
= NULL
;
3073 unsigned short modcount
;
3076 /* Get the total size of the block, exclusive of the size itself */
3078 nbytes
= attribute_size (AT_mod_fund_type
);
3079 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3082 /* Deduct the size of the fundamental type bytes at the end of the block. */
3084 modcount
-= attribute_size (AT_fund_type
);
3086 /* Now do the actual decoding */
3088 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3096 decode_mod_u_d_type -- decode a modified user defined type
3100 static struct type *decode_mod_u_d_type (char *typedata)
3104 Decode a block of data containing a modified user defined
3105 type specification. TYPEDATA is a pointer to the block,
3106 which consists of a two byte length, containing the size
3107 of the rest of the block. At the end of the block is a
3108 four byte value that gives a reference to a user defined type.
3109 Everything in between are type modifiers.
3111 We simply compute the number of modifiers and call the general
3112 function decode_modified_type to do the actual work.
3115 static struct type
*
3116 decode_mod_u_d_type (typedata
)
3119 struct type
*typep
= NULL
;
3120 unsigned short modcount
;
3123 /* Get the total size of the block, exclusive of the size itself */
3125 nbytes
= attribute_size (AT_mod_u_d_type
);
3126 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3129 /* Deduct the size of the reference type bytes at the end of the block. */
3131 modcount
-= attribute_size (AT_user_def_type
);
3133 /* Now do the actual decoding */
3135 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3143 decode_modified_type -- decode modified user or fundamental type
3147 static struct type *decode_modified_type (char *modifiers,
3148 unsigned short modcount, int mtype)
3152 Decode a modified type, either a modified fundamental type or
3153 a modified user defined type. MODIFIERS is a pointer to the
3154 block of bytes that define MODCOUNT modifiers. Immediately
3155 following the last modifier is a short containing the fundamental
3156 type or a long containing the reference to the user defined
3157 type. Which one is determined by MTYPE, which is either
3158 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3159 type we are generating.
3161 We call ourself recursively to generate each modified type,`
3162 until MODCOUNT reaches zero, at which point we have consumed
3163 all the modifiers and generate either the fundamental type or
3164 user defined type. When the recursion unwinds, each modifier
3165 is applied in turn to generate the full modified type.
3169 If we find a modifier that we don't recognize, and it is not one
3170 of those reserved for application specific use, then we issue a
3171 warning and simply ignore the modifier.
3175 We currently ignore MOD_const and MOD_volatile. (FIXME)
3179 static struct type
*
3180 decode_modified_type (modifiers
, modcount
, mtype
)
3182 unsigned int modcount
;
3185 struct type
*typep
= NULL
;
3186 unsigned short fundtype
;
3195 case AT_mod_fund_type
:
3196 nbytes
= attribute_size (AT_fund_type
);
3197 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3199 typep
= decode_fund_type (fundtype
);
3201 case AT_mod_u_d_type
:
3202 nbytes
= attribute_size (AT_user_def_type
);
3203 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3205 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3207 typep
= alloc_utype (die_ref
, NULL
);
3211 complain (&botched_modified_type
, DIE_ID
, DIE_NAME
, mtype
);
3212 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3218 modifier
= *modifiers
++;
3219 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3222 case MOD_pointer_to
:
3223 typep
= lookup_pointer_type (typep
);
3225 case MOD_reference_to
:
3226 typep
= lookup_reference_type (typep
);
3229 complain (&const_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3232 complain (&volatile_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3235 if (!(MOD_lo_user
<= (unsigned char) modifier
3236 && (unsigned char) modifier
<= MOD_hi_user
))
3238 complain (&unknown_type_modifier
, DIE_ID
, DIE_NAME
, modifier
);
3250 decode_fund_type -- translate basic DWARF type to gdb base type
3254 Given an integer that is one of the fundamental DWARF types,
3255 translate it to one of the basic internal gdb types and return
3256 a pointer to the appropriate gdb type (a "struct type *").
3260 For robustness, if we are asked to translate a fundamental
3261 type that we are unprepared to deal with, we return int so
3262 callers can always depend upon a valid type being returned,
3263 and so gdb may at least do something reasonable by default.
3264 If the type is not in the range of those types defined as
3265 application specific types, we also issue a warning.
3268 static struct type
*
3269 decode_fund_type (fundtype
)
3270 unsigned int fundtype
;
3272 struct type
*typep
= NULL
;
3278 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3281 case FT_boolean
: /* Was FT_set in AT&T version */
3282 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3285 case FT_pointer
: /* (void *) */
3286 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3287 typep
= lookup_pointer_type (typep
);
3291 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3294 case FT_signed_char
:
3295 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3298 case FT_unsigned_char
:
3299 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3303 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3306 case FT_signed_short
:
3307 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3310 case FT_unsigned_short
:
3311 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3315 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3318 case FT_signed_integer
:
3319 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3322 case FT_unsigned_integer
:
3323 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3327 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3330 case FT_signed_long
:
3331 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3334 case FT_unsigned_long
:
3335 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3339 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3342 case FT_signed_long_long
:
3343 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3346 case FT_unsigned_long_long
:
3347 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3351 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3354 case FT_dbl_prec_float
:
3355 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3358 case FT_ext_prec_float
:
3359 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3363 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3366 case FT_dbl_prec_complex
:
3367 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3370 case FT_ext_prec_complex
:
3371 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3378 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3379 if (!(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3381 complain (&unexpected_fund_type
, DIE_ID
, DIE_NAME
, fundtype
);
3392 create_name -- allocate a fresh copy of a string on an obstack
3396 Given a pointer to a string and a pointer to an obstack, allocates
3397 a fresh copy of the string on the specified obstack.
3402 create_name (name
, obstackp
)
3404 struct obstack
*obstackp
;
3409 length
= strlen (name
) + 1;
3410 newname
= (char *) obstack_alloc (obstackp
, length
);
3411 strcpy (newname
, name
);
3419 basicdieinfo -- extract the minimal die info from raw die data
3423 void basicdieinfo (char *diep, struct dieinfo *dip,
3424 struct objfile *objfile)
3428 Given a pointer to raw DIE data, and a pointer to an instance of a
3429 die info structure, this function extracts the basic information
3430 from the DIE data required to continue processing this DIE, along
3431 with some bookkeeping information about the DIE.
3433 The information we absolutely must have includes the DIE tag,
3434 and the DIE length. If we need the sibling reference, then we
3435 will have to call completedieinfo() to process all the remaining
3438 Note that since there is no guarantee that the data is properly
3439 aligned in memory for the type of access required (indirection
3440 through anything other than a char pointer), and there is no
3441 guarantee that it is in the same byte order as the gdb host,
3442 we call a function which deals with both alignment and byte
3443 swapping issues. Possibly inefficient, but quite portable.
3445 We also take care of some other basic things at this point, such
3446 as ensuring that the instance of the die info structure starts
3447 out completely zero'd and that curdie is initialized for use
3448 in error reporting if we have a problem with the current die.
3452 All DIE's must have at least a valid length, thus the minimum
3453 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3454 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3455 are forced to be TAG_padding DIES.
3457 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3458 that if a padding DIE is used for alignment and the amount needed is
3459 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3460 enough to align to the next alignment boundry.
3462 We do some basic sanity checking here, such as verifying that the
3463 length of the die would not cause it to overrun the recorded end of
3464 the buffer holding the DIE info. If we find a DIE that is either
3465 too small or too large, we force it's length to zero which should
3466 cause the caller to take appropriate action.
3470 basicdieinfo (dip
, diep
, objfile
)
3471 struct dieinfo
*dip
;
3473 struct objfile
*objfile
;
3476 memset (dip
, 0, sizeof (struct dieinfo
));
3478 dip
-> die_ref
= dbroff
+ (diep
- dbbase
);
3479 dip
-> die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3481 if ((dip
-> die_length
< SIZEOF_DIE_LENGTH
) ||
3482 ((diep
+ dip
-> die_length
) > (dbbase
+ dbsize
)))
3484 complain (&malformed_die
, DIE_ID
, DIE_NAME
, dip
-> die_length
);
3485 dip
-> die_length
= 0;
3487 else if (dip
-> die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3489 dip
-> die_tag
= TAG_padding
;
3493 diep
+= SIZEOF_DIE_LENGTH
;
3494 dip
-> die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3503 completedieinfo -- finish reading the information for a given DIE
3507 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3511 Given a pointer to an already partially initialized die info structure,
3512 scan the raw DIE data and finish filling in the die info structure
3513 from the various attributes found.
3515 Note that since there is no guarantee that the data is properly
3516 aligned in memory for the type of access required (indirection
3517 through anything other than a char pointer), and there is no
3518 guarantee that it is in the same byte order as the gdb host,
3519 we call a function which deals with both alignment and byte
3520 swapping issues. Possibly inefficient, but quite portable.
3524 Each time we are called, we increment the diecount variable, which
3525 keeps an approximate count of the number of dies processed for
3526 each compilation unit. This information is presented to the user
3527 if the info_verbose flag is set.
3532 completedieinfo (dip
, objfile
)
3533 struct dieinfo
*dip
;
3534 struct objfile
*objfile
;
3536 char *diep
; /* Current pointer into raw DIE data */
3537 char *end
; /* Terminate DIE scan here */
3538 unsigned short attr
; /* Current attribute being scanned */
3539 unsigned short form
; /* Form of the attribute */
3540 int nbytes
; /* Size of next field to read */
3544 end
= diep
+ dip
-> die_length
;
3545 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3548 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3549 diep
+= SIZEOF_ATTRIBUTE
;
3550 if ((nbytes
= attribute_size (attr
)) == -1)
3552 complain (&unknown_attribute_length
, DIE_ID
, DIE_NAME
);
3559 dip
-> at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3563 dip
-> at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3567 dip
-> at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3571 dip
-> at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3575 dip
-> at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3577 dip
-> has_at_stmt_list
= 1;
3580 dip
-> at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3582 dip
-> at_low_pc
+= baseaddr
;
3583 dip
-> has_at_low_pc
= 1;
3586 dip
-> at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3588 dip
-> at_high_pc
+= baseaddr
;
3591 dip
-> at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3594 case AT_user_def_type
:
3595 dip
-> at_user_def_type
= target_to_host (diep
, nbytes
,
3596 GET_UNSIGNED
, objfile
);
3599 dip
-> at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3601 dip
-> has_at_byte_size
= 1;
3604 dip
-> at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3608 dip
-> at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3612 dip
-> at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3616 dip
-> at_location
= diep
;
3618 case AT_mod_fund_type
:
3619 dip
-> at_mod_fund_type
= diep
;
3621 case AT_subscr_data
:
3622 dip
-> at_subscr_data
= diep
;
3624 case AT_mod_u_d_type
:
3625 dip
-> at_mod_u_d_type
= diep
;
3627 case AT_element_list
:
3628 dip
-> at_element_list
= diep
;
3629 dip
-> short_element_list
= 0;
3631 case AT_short_element_list
:
3632 dip
-> at_element_list
= diep
;
3633 dip
-> short_element_list
= 1;
3635 case AT_discr_value
:
3636 dip
-> at_discr_value
= diep
;
3638 case AT_string_length
:
3639 dip
-> at_string_length
= diep
;
3642 dip
-> at_name
= diep
;
3645 /* For now, ignore any "hostname:" portion, since gdb doesn't
3646 know how to deal with it. (FIXME). */
3647 dip
-> at_comp_dir
= strrchr (diep
, ':');
3648 if (dip
-> at_comp_dir
!= NULL
)
3650 dip
-> at_comp_dir
++;
3654 dip
-> at_comp_dir
= diep
;
3658 dip
-> at_producer
= diep
;
3660 case AT_start_scope
:
3661 dip
-> at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3664 case AT_stride_size
:
3665 dip
-> at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3669 dip
-> at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3673 dip
-> at_prototyped
= diep
;
3676 /* Found an attribute that we are unprepared to handle. However
3677 it is specifically one of the design goals of DWARF that
3678 consumers should ignore unknown attributes. As long as the
3679 form is one that we recognize (so we know how to skip it),
3680 we can just ignore the unknown attribute. */
3683 form
= FORM_FROM_ATTR (attr
);
3697 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3700 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3703 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3706 diep
+= strlen (diep
) + 1;
3709 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);
3720 target_to_host -- swap in target data to host
3724 target_to_host (char *from, int nbytes, int signextend,
3725 struct objfile *objfile)
3729 Given pointer to data in target format in FROM, a byte count for
3730 the size of the data in NBYTES, a flag indicating whether or not
3731 the data is signed in SIGNEXTEND, and a pointer to the current
3732 objfile in OBJFILE, convert the data to host format and return
3733 the converted value.
3737 FIXME: If we read data that is known to be signed, and expect to
3738 use it as signed data, then we need to explicitly sign extend the
3739 result until the bfd library is able to do this for us.
3741 FIXME: Would a 32 bit target ever need an 8 byte result?
3746 target_to_host (from
, nbytes
, signextend
, objfile
)
3749 int signextend
; /* FIXME: Unused */
3750 struct objfile
*objfile
;
3757 rtnval
= bfd_get_64 (objfile
-> obfd
, (bfd_byte
*) from
);
3760 rtnval
= bfd_get_32 (objfile
-> obfd
, (bfd_byte
*) from
);
3763 rtnval
= bfd_get_16 (objfile
-> obfd
, (bfd_byte
*) from
);
3766 rtnval
= bfd_get_8 (objfile
-> obfd
, (bfd_byte
*) from
);
3769 complain (&no_bfd_get_N
, DIE_ID
, DIE_NAME
, nbytes
);
3780 attribute_size -- compute size of data for a DWARF attribute
3784 static int attribute_size (unsigned int attr)
3788 Given a DWARF attribute in ATTR, compute the size of the first
3789 piece of data associated with this attribute and return that
3792 Returns -1 for unrecognized attributes.
3797 attribute_size (attr
)
3800 int nbytes
; /* Size of next data for this attribute */
3801 unsigned short form
; /* Form of the attribute */
3803 form
= FORM_FROM_ATTR (attr
);
3806 case FORM_STRING
: /* A variable length field is next */
3809 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3810 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3813 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3814 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3815 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3818 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3821 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3822 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3825 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);