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. :-)
47 #include "elf/dwarf.h"
50 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
52 #include "complaints.h"
61 /* FIXME -- convert this to SEEK_SET a la POSIX, move to config files. */
66 /* Some macros to provide DIE info for complaints. */
68 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
69 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
71 /* Complaints that can be issued during DWARF debug info reading. */
73 struct complaint no_bfd_get_N
=
75 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object", 0, 0
78 struct complaint malformed_die
=
80 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%d bytes)", 0, 0
83 struct complaint bad_die_ref
=
85 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit", 0, 0
88 struct complaint unknown_attribute_form
=
90 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", 0, 0
93 struct complaint unknown_attribute_length
=
95 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes", 0, 0
98 struct complaint unexpected_fund_type
=
100 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x", 0, 0
103 struct complaint unknown_type_modifier
=
105 "DIE @ 0x%x \"%s\", unknown type modifier %u", 0, 0
108 struct complaint volatile_ignored
=
110 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored", 0, 0
113 struct complaint const_ignored
=
115 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", 0, 0
118 struct complaint botched_modified_type
=
120 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)", 0, 0
123 struct complaint op_deref2
=
125 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%x not handled", 0, 0
128 struct complaint op_deref4
=
130 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%x not handled", 0, 0
133 struct complaint basereg_not_handled
=
135 "DIE @ 0x%x \"%s\", BASEREG %d not handled", 0, 0
138 struct complaint dup_user_type_allocation
=
140 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation", 0, 0
143 struct complaint dup_user_type_definition
=
145 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition", 0, 0
148 struct complaint missing_tag
=
150 "DIE @ 0x%x \"%s\", missing class, structure, or union tag", 0, 0
153 struct complaint bad_array_element_type
=
155 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", 0, 0
158 struct complaint subscript_data_items
=
160 "DIE @ 0x%x \"%s\", can't decode subscript data items", 0, 0
163 struct complaint unhandled_array_subscript_format
=
165 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet", 0, 0
168 struct complaint unknown_array_subscript_format
=
170 "DIE @ 0x%x \"%s\", unknown array subscript format %x", 0, 0
173 struct complaint not_row_major
=
175 "DIE @ 0x%x \"%s\", array not row major; not handled correctly", 0, 0
178 typedef unsigned int DIE_REF
; /* Reference to a DIE */
181 #define GCC_PRODUCER "GNU C "
184 #ifndef GPLUS_PRODUCER
185 #define GPLUS_PRODUCER "GNU C++ "
189 #define LCC_PRODUCER "NCR C/C++"
192 #ifndef CHILL_PRODUCER
193 #define CHILL_PRODUCER "GNU Chill "
196 /* Flags to target_to_host() that tell whether or not the data object is
197 expected to be signed. Used, for example, when fetching a signed
198 integer in the target environment which is used as a signed integer
199 in the host environment, and the two environments have different sized
200 ints. In this case, *somebody* has to sign extend the smaller sized
203 #define GET_UNSIGNED 0 /* No sign extension required */
204 #define GET_SIGNED 1 /* Sign extension required */
206 /* Defines for things which are specified in the document "DWARF Debugging
207 Information Format" published by UNIX International, Programming Languages
208 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
210 #define SIZEOF_DIE_LENGTH 4
211 #define SIZEOF_DIE_TAG 2
212 #define SIZEOF_ATTRIBUTE 2
213 #define SIZEOF_FORMAT_SPECIFIER 1
214 #define SIZEOF_FMT_FT 2
215 #define SIZEOF_LINETBL_LENGTH 4
216 #define SIZEOF_LINETBL_LINENO 4
217 #define SIZEOF_LINETBL_STMT 2
218 #define SIZEOF_LINETBL_DELTA 4
219 #define SIZEOF_LOC_ATOM_CODE 1
221 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
223 /* Macros that return the sizes of various types of data in the target
226 FIXME: Currently these are just compile time constants (as they are in
227 other parts of gdb as well). They need to be able to get the right size
228 either from the bfd or possibly from the DWARF info. It would be nice if
229 the DWARF producer inserted DIES that describe the fundamental types in
230 the target environment into the DWARF info, similar to the way dbx stabs
231 producers produce information about their fundamental types. */
233 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
234 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
236 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
237 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
238 However, the Issue 2 DWARF specification from AT&T defines it as
239 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
240 For backwards compatibility with the AT&T compiler produced executables
241 we define AT_short_element_list for this variant. */
243 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
245 /* External variables referenced. */
247 extern int info_verbose
; /* From main.c; nonzero => verbose */
248 extern char *warning_pre_print
; /* From utils.c */
250 /* The DWARF debugging information consists of two major pieces,
251 one is a block of DWARF Information Entries (DIE's) and the other
252 is a line number table. The "struct dieinfo" structure contains
253 the information for a single DIE, the one currently being processed.
255 In order to make it easier to randomly access the attribute fields
256 of the current DIE, which are specifically unordered within the DIE,
257 each DIE is scanned and an instance of the "struct dieinfo"
258 structure is initialized.
260 Initialization is done in two levels. The first, done by basicdieinfo(),
261 just initializes those fields that are vital to deciding whether or not
262 to use this DIE, how to skip past it, etc. The second, done by the
263 function completedieinfo(), fills in the rest of the information.
265 Attributes which have block forms are not interpreted at the time
266 the DIE is scanned, instead we just save pointers to the start
267 of their value fields.
269 Some fields have a flag <name>_p that is set when the value of the
270 field is valid (I.E. we found a matching attribute in the DIE). Since
271 we may want to test for the presence of some attributes in the DIE,
272 such as AT_low_pc, without restricting the values of the field,
273 we need someway to note that we found such an attribute.
280 char * die
; /* Pointer to the raw DIE data */
281 unsigned long die_length
; /* Length of the raw DIE data */
282 DIE_REF die_ref
; /* Offset of this DIE */
283 unsigned short die_tag
; /* Tag for this DIE */
284 unsigned long at_padding
;
285 unsigned long at_sibling
;
288 unsigned short at_fund_type
;
289 BLOCK
* at_mod_fund_type
;
290 unsigned long at_user_def_type
;
291 BLOCK
* at_mod_u_d_type
;
292 unsigned short at_ordering
;
293 BLOCK
* at_subscr_data
;
294 unsigned long at_byte_size
;
295 unsigned short at_bit_offset
;
296 unsigned long at_bit_size
;
297 BLOCK
* at_element_list
;
298 unsigned long at_stmt_list
;
299 unsigned long at_low_pc
;
300 unsigned long at_high_pc
;
301 unsigned long at_language
;
302 unsigned long at_member
;
303 unsigned long at_discr
;
304 BLOCK
* at_discr_value
;
305 BLOCK
* at_string_length
;
308 unsigned long at_start_scope
;
309 unsigned long at_stride_size
;
310 unsigned long at_src_info
;
311 char * at_prototyped
;
312 unsigned int has_at_low_pc
:1;
313 unsigned int has_at_stmt_list
:1;
314 unsigned int has_at_byte_size
:1;
315 unsigned int short_element_list
:1;
318 static int diecount
; /* Approximate count of dies for compilation unit */
319 static struct dieinfo
*curdie
; /* For warnings and such */
321 static char *dbbase
; /* Base pointer to dwarf info */
322 static int dbsize
; /* Size of dwarf info in bytes */
323 static int dbroff
; /* Relative offset from start of .debug section */
324 static char *lnbase
; /* Base pointer to line section */
325 static int isreg
; /* Kludge to identify register variables */
326 /* Kludge to identify basereg references. Nonzero if we have an offset
327 relative to a basereg. */
329 /* Which base register is it relative to? */
332 /* This value is added to each symbol value. FIXME: Generalize to
333 the section_offsets structure used by dbxread (once this is done,
334 pass the appropriate section number to end_symtab). */
335 static CORE_ADDR baseaddr
; /* Add to each symbol value */
337 /* The section offsets used in the current psymtab or symtab. FIXME,
338 only used to pass one value (baseaddr) at the moment. */
339 static struct section_offsets
*base_section_offsets
;
341 /* Each partial symbol table entry contains a pointer to private data for the
342 read_symtab() function to use when expanding a partial symbol table entry
343 to a full symbol table entry. For DWARF debugging info, this data is
344 contained in the following structure and macros are provided for easy
345 access to the members given a pointer to a partial symbol table entry.
347 dbfoff Always the absolute file offset to the start of the ".debug"
348 section for the file containing the DIE's being accessed.
350 dbroff Relative offset from the start of the ".debug" access to the
351 first DIE to be accessed. When building the partial symbol
352 table, this value will be zero since we are accessing the
353 entire ".debug" section. When expanding a partial symbol
354 table entry, this value will be the offset to the first
355 DIE for the compilation unit containing the symbol that
356 triggers the expansion.
358 dblength The size of the chunk of DIE's being examined, in bytes.
360 lnfoff The absolute file offset to the line table fragment. Ignored
361 when building partial symbol tables, but used when expanding
362 them, and contains the absolute file offset to the fragment
363 of the ".line" section containing the line numbers for the
364 current compilation unit.
368 file_ptr dbfoff
; /* Absolute file offset to start of .debug section */
369 int dbroff
; /* Relative offset from start of .debug section */
370 int dblength
; /* Size of the chunk of DIE's being examined */
371 file_ptr lnfoff
; /* Absolute file offset to line table fragment */
374 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
375 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
376 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
377 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
379 /* The generic symbol table building routines have separate lists for
380 file scope symbols and all all other scopes (local scopes). So
381 we need to select the right one to pass to add_symbol_to_list().
382 We do it by keeping a pointer to the correct list in list_in_scope.
384 FIXME: The original dwarf code just treated the file scope as the first
385 local scope, and all other local scopes as nested local scopes, and worked
386 fine. Check to see if we really need to distinguish these in buildsym.c */
388 struct pending
**list_in_scope
= &file_symbols
;
390 /* DIES which have user defined types or modified user defined types refer to
391 other DIES for the type information. Thus we need to associate the offset
392 of a DIE for a user defined type with a pointer to the type information.
394 Originally this was done using a simple but expensive algorithm, with an
395 array of unsorted structures, each containing an offset/type-pointer pair.
396 This array was scanned linearly each time a lookup was done. The result
397 was that gdb was spending over half it's startup time munging through this
398 array of pointers looking for a structure that had the right offset member.
400 The second attempt used the same array of structures, but the array was
401 sorted using qsort each time a new offset/type was recorded, and a binary
402 search was used to find the type pointer for a given DIE offset. This was
403 even slower, due to the overhead of sorting the array each time a new
404 offset/type pair was entered.
406 The third attempt uses a fixed size array of type pointers, indexed by a
407 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
408 we can divide any DIE offset by 4 to obtain a unique index into this fixed
409 size array. Since each element is a 4 byte pointer, it takes exactly as
410 much memory to hold this array as to hold the DWARF info for a given
411 compilation unit. But it gets freed as soon as we are done with it.
412 This has worked well in practice, as a reasonable tradeoff between memory
413 consumption and speed, without having to resort to much more complicated
416 static struct type
**utypes
; /* Pointer to array of user type pointers */
417 static int numutypes
; /* Max number of user type pointers */
419 /* Maintain an array of referenced fundamental types for the current
420 compilation unit being read. For DWARF version 1, we have to construct
421 the fundamental types on the fly, since no information about the
422 fundamental types is supplied. Each such fundamental type is created by
423 calling a language dependent routine to create the type, and then a
424 pointer to that type is then placed in the array at the index specified
425 by it's FT_<TYPENAME> value. The array has a fixed size set by the
426 FT_NUM_MEMBERS compile time constant, which is the number of predefined
427 fundamental types gdb knows how to construct. */
429 static struct type
*ftypes
[FT_NUM_MEMBERS
]; /* Fundamental types */
431 /* Record the language for the compilation unit which is currently being
432 processed. We know it once we have seen the TAG_compile_unit DIE,
433 and we need it while processing the DIE's for that compilation unit.
434 It is eventually saved in the symtab structure, but we don't finalize
435 the symtab struct until we have processed all the DIE's for the
436 compilation unit. We also need to get and save a pointer to the
437 language struct for this language, so we can call the language
438 dependent routines for doing things such as creating fundamental
441 static enum language cu_language
;
442 static const struct language_defn
*cu_language_defn
;
444 /* Forward declarations of static functions so we don't have to worry
445 about ordering within this file. */
448 attribute_size
PARAMS ((unsigned int));
451 target_to_host
PARAMS ((char *, int, int, struct objfile
*));
454 add_enum_psymbol
PARAMS ((struct dieinfo
*, struct objfile
*));
457 handle_producer
PARAMS ((char *));
460 read_file_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
463 read_func_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
466 read_lexical_block_scope
PARAMS ((struct dieinfo
*, char *, char *,
470 scan_partial_symbols
PARAMS ((char *, char *, struct objfile
*));
473 scan_compilation_units
PARAMS ((char *, char *, file_ptr
,
474 file_ptr
, struct objfile
*));
477 add_partial_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
480 init_psymbol_list
PARAMS ((struct objfile
*, int));
483 basicdieinfo
PARAMS ((struct dieinfo
*, char *, struct objfile
*));
486 completedieinfo
PARAMS ((struct dieinfo
*, struct objfile
*));
489 dwarf_psymtab_to_symtab
PARAMS ((struct partial_symtab
*));
492 psymtab_to_symtab_1
PARAMS ((struct partial_symtab
*));
495 read_ofile_symtab
PARAMS ((struct partial_symtab
*));
498 process_dies
PARAMS ((char *, char *, struct objfile
*));
501 read_structure_scope
PARAMS ((struct dieinfo
*, char *, char *,
505 decode_array_element_type
PARAMS ((char *));
508 decode_subscript_data_item
PARAMS ((char *, char *));
511 dwarf_read_array_type
PARAMS ((struct dieinfo
*));
514 read_tag_pointer_type
PARAMS ((struct dieinfo
*dip
));
517 read_tag_string_type
PARAMS ((struct dieinfo
*dip
));
520 read_subroutine_type
PARAMS ((struct dieinfo
*, char *, char *));
523 read_enumeration
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
526 struct_type
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
529 enum_type
PARAMS ((struct dieinfo
*, struct objfile
*));
532 decode_line_numbers
PARAMS ((char *));
535 decode_die_type
PARAMS ((struct dieinfo
*));
538 decode_mod_fund_type
PARAMS ((char *));
541 decode_mod_u_d_type
PARAMS ((char *));
544 decode_modified_type
PARAMS ((char *, unsigned int, int));
547 decode_fund_type
PARAMS ((unsigned int));
550 create_name
PARAMS ((char *, struct obstack
*));
553 lookup_utype
PARAMS ((DIE_REF
));
556 alloc_utype
PARAMS ((DIE_REF
, struct type
*));
558 static struct symbol
*
559 new_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
562 synthesize_typedef
PARAMS ((struct dieinfo
*, struct objfile
*,
566 locval
PARAMS ((char *));
569 set_cu_language
PARAMS ((struct dieinfo
*));
572 dwarf_fundamental_type
PARAMS ((struct objfile
*, int));
579 dwarf_fundamental_type -- lookup or create a fundamental type
584 dwarf_fundamental_type (struct objfile *objfile, int typeid)
588 DWARF version 1 doesn't supply any fundamental type information,
589 so gdb has to construct such types. It has a fixed number of
590 fundamental types that it knows how to construct, which is the
591 union of all types that it knows how to construct for all languages
592 that it knows about. These are enumerated in gdbtypes.h.
594 As an example, assume we find a DIE that references a DWARF
595 fundamental type of FT_integer. We first look in the ftypes
596 array to see if we already have such a type, indexed by the
597 gdb internal value of FT_INTEGER. If so, we simply return a
598 pointer to that type. If not, then we ask an appropriate
599 language dependent routine to create a type FT_INTEGER, using
600 defaults reasonable for the current target machine, and install
601 that type in ftypes for future reference.
605 Pointer to a fundamental type.
610 dwarf_fundamental_type (objfile
, typeid)
611 struct objfile
*objfile
;
614 if (typeid < 0 || typeid >= FT_NUM_MEMBERS
)
616 error ("internal error - invalid fundamental type id %d", typeid);
619 /* Look for this particular type in the fundamental type vector. If one is
620 not found, create and install one appropriate for the current language
621 and the current target machine. */
623 if (ftypes
[typeid] == NULL
)
625 ftypes
[typeid] = cu_language_defn
-> la_fund_type(objfile
, typeid);
628 return (ftypes
[typeid]);
635 set_cu_language -- set local copy of language for compilation unit
640 set_cu_language (struct dieinfo *dip)
644 Decode the language attribute for a compilation unit DIE and
645 remember what the language was. We use this at various times
646 when processing DIE's for a given compilation unit.
655 set_cu_language (dip
)
658 switch (dip
-> at_language
)
662 cu_language
= language_c
;
664 case LANG_C_PLUS_PLUS
:
665 cu_language
= language_cplus
;
668 cu_language
= language_chill
;
671 cu_language
= language_m2
;
679 /* We don't know anything special about these yet. */
680 cu_language
= language_unknown
;
683 /* If no at_language, try to deduce one from the filename */
684 cu_language
= deduce_language_from_filename (dip
-> at_name
);
687 cu_language_defn
= language_def (cu_language
);
694 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
698 void dwarf_build_psymtabs (struct objfile *objfile,
699 struct section_offsets *section_offsets,
700 int mainline, file_ptr dbfoff, unsigned int dbfsize,
701 file_ptr lnoffset, unsigned int lnsize)
705 This function is called upon to build partial symtabs from files
706 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
708 It is passed a bfd* containing the DIES
709 and line number information, the corresponding filename for that
710 file, a base address for relocating the symbols, a flag indicating
711 whether or not this debugging information is from a "main symbol
712 table" rather than a shared library or dynamically linked file,
713 and file offset/size pairs for the DIE information and line number
723 dwarf_build_psymtabs (objfile
, section_offsets
, mainline
, dbfoff
, dbfsize
,
725 struct objfile
*objfile
;
726 struct section_offsets
*section_offsets
;
729 unsigned int dbfsize
;
733 bfd
*abfd
= objfile
->obfd
;
734 struct cleanup
*back_to
;
736 current_objfile
= objfile
;
738 dbbase
= xmalloc (dbsize
);
740 if ((bfd_seek (abfd
, dbfoff
, L_SET
) != 0) ||
741 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
744 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
746 back_to
= make_cleanup (free
, dbbase
);
748 /* If we are reinitializing, or if we have never loaded syms yet, init.
749 Since we have no idea how many DIES we are looking at, we just guess
750 some arbitrary value. */
752 if (mainline
|| objfile
-> global_psymbols
.size
== 0 ||
753 objfile
-> static_psymbols
.size
== 0)
755 init_psymbol_list (objfile
, 1024);
758 /* Save the relocation factor where everybody can see it. */
760 base_section_offsets
= section_offsets
;
761 baseaddr
= ANOFFSET (section_offsets
, 0);
763 /* Follow the compilation unit sibling chain, building a partial symbol
764 table entry for each one. Save enough information about each compilation
765 unit to locate the full DWARF information later. */
767 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
769 do_cleanups (back_to
);
770 current_objfile
= NULL
;
777 read_lexical_block_scope -- process all dies in a lexical block
781 static void read_lexical_block_scope (struct dieinfo *dip,
782 char *thisdie, char *enddie)
786 Process all the DIES contained within a lexical block scope.
787 Start a new scope, process the dies, and then close the scope.
792 read_lexical_block_scope (dip
, thisdie
, enddie
, objfile
)
796 struct objfile
*objfile
;
798 register struct context_stack
*new;
800 push_context (0, dip
-> at_low_pc
);
801 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
802 new = pop_context ();
803 if (local_symbols
!= NULL
)
805 finish_block (0, &local_symbols
, new -> old_blocks
, new -> start_addr
,
806 dip
-> at_high_pc
, objfile
);
808 local_symbols
= new -> locals
;
815 lookup_utype -- look up a user defined type from die reference
819 static type *lookup_utype (DIE_REF die_ref)
823 Given a DIE reference, lookup the user defined type associated with
824 that DIE, if it has been registered already. If not registered, then
825 return NULL. Alloc_utype() can be called to register an empty
826 type for this reference, which will be filled in later when the
827 actual referenced DIE is processed.
831 lookup_utype (die_ref
)
834 struct type
*type
= NULL
;
837 utypeidx
= (die_ref
- dbroff
) / 4;
838 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
840 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
844 type
= *(utypes
+ utypeidx
);
854 alloc_utype -- add a user defined type for die reference
858 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
862 Given a die reference DIE_REF, and a possible pointer to a user
863 defined type UTYPEP, register that this reference has a user
864 defined type and either use the specified type in UTYPEP or
865 make a new empty type that will be filled in later.
867 We should only be called after calling lookup_utype() to verify that
868 there is not currently a type registered for DIE_REF.
872 alloc_utype (die_ref
, utypep
)
879 utypeidx
= (die_ref
- dbroff
) / 4;
880 typep
= utypes
+ utypeidx
;
881 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
883 utypep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
884 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
886 else if (*typep
!= NULL
)
889 complain (&dup_user_type_allocation
, DIE_ID
, DIE_NAME
);
895 utypep
= alloc_type (current_objfile
);
906 decode_die_type -- return a type for a specified die
910 static struct type *decode_die_type (struct dieinfo *dip)
914 Given a pointer to a die information structure DIP, decode the
915 type of the die and return a pointer to the decoded type. All
916 dies without specific types default to type int.
920 decode_die_type (dip
)
923 struct type
*type
= NULL
;
925 if (dip
-> at_fund_type
!= 0)
927 type
= decode_fund_type (dip
-> at_fund_type
);
929 else if (dip
-> at_mod_fund_type
!= NULL
)
931 type
= decode_mod_fund_type (dip
-> at_mod_fund_type
);
933 else if (dip
-> at_user_def_type
)
935 if ((type
= lookup_utype (dip
-> at_user_def_type
)) == NULL
)
937 type
= alloc_utype (dip
-> at_user_def_type
, NULL
);
940 else if (dip
-> at_mod_u_d_type
)
942 type
= decode_mod_u_d_type (dip
-> at_mod_u_d_type
);
946 type
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
955 struct_type -- compute and return the type for a struct or union
959 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
960 char *enddie, struct objfile *objfile)
964 Given pointer to a die information structure for a die which
965 defines a union or structure (and MUST define one or the other),
966 and pointers to the raw die data that define the range of dies which
967 define the members, compute and return the user defined type for the
972 struct_type (dip
, thisdie
, enddie
, objfile
)
976 struct objfile
*objfile
;
980 struct nextfield
*next
;
983 struct nextfield
*list
= NULL
;
984 struct nextfield
*new;
993 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
995 /* No forward references created an empty type, so install one now */
996 type
= alloc_utype (dip
-> die_ref
, NULL
);
998 INIT_CPLUS_SPECIFIC(type
);
999 switch (dip
-> die_tag
)
1001 case TAG_class_type
:
1002 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
1004 case TAG_structure_type
:
1005 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
1007 case TAG_union_type
:
1008 TYPE_CODE (type
) = TYPE_CODE_UNION
;
1011 /* Should never happen */
1012 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
1013 complain (&missing_tag
, DIE_ID
, DIE_NAME
);
1016 /* Some compilers try to be helpful by inventing "fake" names for
1017 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1018 Thanks, but no thanks... */
1019 if (dip
-> at_name
!= NULL
1020 && *dip
-> at_name
!= '~'
1021 && *dip
-> at_name
!= '.')
1023 TYPE_TAG_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1024 "", "", dip
-> at_name
);
1026 /* Use whatever size is known. Zero is a valid size. We might however
1027 wish to check has_at_byte_size to make sure that some byte size was
1028 given explicitly, but DWARF doesn't specify that explicit sizes of
1029 zero have to present, so complaining about missing sizes should
1030 probably not be the default. */
1031 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1032 thisdie
+= dip
-> die_length
;
1033 while (thisdie
< enddie
)
1035 basicdieinfo (&mbr
, thisdie
, objfile
);
1036 completedieinfo (&mbr
, objfile
);
1037 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
1041 else if (mbr
.at_sibling
!= 0)
1043 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
1047 nextdie
= thisdie
+ mbr
.die_length
;
1049 switch (mbr
.die_tag
)
1052 /* Get space to record the next field's data. */
1053 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1056 /* Save the data. */
1057 list
-> field
.name
=
1058 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
1059 &objfile
-> type_obstack
);
1060 list
-> field
.type
= decode_die_type (&mbr
);
1061 list
-> field
.bitpos
= 8 * locval (mbr
.at_location
);
1062 /* Handle bit fields. */
1063 list
-> field
.bitsize
= mbr
.at_bit_size
;
1065 /* For big endian bits, the at_bit_offset gives the additional
1066 bit offset from the MSB of the containing anonymous object to
1067 the MSB of the field. We don't have to do anything special
1068 since we don't need to know the size of the anonymous object. */
1069 list
-> field
.bitpos
+= mbr
.at_bit_offset
;
1071 /* For little endian bits, we need to have a non-zero at_bit_size,
1072 so that we know we are in fact dealing with a bitfield. Compute
1073 the bit offset to the MSB of the anonymous object, subtract off
1074 the number of bits from the MSB of the field to the MSB of the
1075 object, and then subtract off the number of bits of the field
1076 itself. The result is the bit offset of the LSB of the field. */
1077 if (mbr
.at_bit_size
> 0)
1079 if (mbr
.has_at_byte_size
)
1081 /* The size of the anonymous object containing the bit field
1082 is explicit, so use the indicated size (in bytes). */
1083 anonymous_size
= mbr
.at_byte_size
;
1087 /* The size of the anonymous object containing the bit field
1088 matches the size of an object of the bit field's type.
1089 DWARF allows at_byte_size to be left out in such cases,
1090 as a debug information size optimization. */
1091 anonymous_size
= TYPE_LENGTH (list
-> field
.type
);
1093 list
-> field
.bitpos
+=
1094 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
1100 process_dies (thisdie
, nextdie
, objfile
);
1105 /* Now create the vector of fields, and record how big it is. We may
1106 not even have any fields, if this DIE was generated due to a reference
1107 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1108 set, which clues gdb in to the fact that it needs to search elsewhere
1109 for the full structure definition. */
1112 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1116 TYPE_NFIELDS (type
) = nfields
;
1117 TYPE_FIELDS (type
) = (struct field
*)
1118 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1119 /* Copy the saved-up fields into the field vector. */
1120 for (n
= nfields
; list
; list
= list
-> next
)
1122 TYPE_FIELD (type
, --n
) = list
-> field
;
1132 read_structure_scope -- process all dies within struct or union
1136 static void read_structure_scope (struct dieinfo *dip,
1137 char *thisdie, char *enddie, struct objfile *objfile)
1141 Called when we find the DIE that starts a structure or union
1142 scope (definition) to process all dies that define the members
1143 of the structure or union. DIP is a pointer to the die info
1144 struct for the DIE that names the structure or union.
1148 Note that we need to call struct_type regardless of whether or not
1149 the DIE has an at_name attribute, since it might be an anonymous
1150 structure or union. This gets the type entered into our set of
1153 However, if the structure is incomplete (an opaque struct/union)
1154 then suppress creating a symbol table entry for it since gdb only
1155 wants to find the one with the complete definition. Note that if
1156 it is complete, we just call new_symbol, which does it's own
1157 checking about whether the struct/union is anonymous or not (and
1158 suppresses creating a symbol table entry itself).
1163 read_structure_scope (dip
, thisdie
, enddie
, objfile
)
1164 struct dieinfo
*dip
;
1167 struct objfile
*objfile
;
1172 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1173 if (!(TYPE_FLAGS (type
) & TYPE_FLAG_STUB
))
1175 sym
= new_symbol (dip
, objfile
);
1178 SYMBOL_TYPE (sym
) = type
;
1179 if (cu_language
== language_cplus
)
1181 synthesize_typedef (dip
, objfile
, type
);
1191 decode_array_element_type -- decode type of the array elements
1195 static struct type *decode_array_element_type (char *scan, char *end)
1199 As the last step in decoding the array subscript information for an
1200 array DIE, we need to decode the type of the array elements. We are
1201 passed a pointer to this last part of the subscript information and
1202 must return the appropriate type. If the type attribute is not
1203 recognized, just warn about the problem and return type int.
1206 static struct type
*
1207 decode_array_element_type (scan
)
1212 unsigned short attribute
;
1213 unsigned short fundtype
;
1216 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1218 scan
+= SIZEOF_ATTRIBUTE
;
1219 if ((nbytes
= attribute_size (attribute
)) == -1)
1221 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1222 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1229 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1231 typep
= decode_fund_type (fundtype
);
1233 case AT_mod_fund_type
:
1234 typep
= decode_mod_fund_type (scan
);
1236 case AT_user_def_type
:
1237 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1239 if ((typep
= lookup_utype (die_ref
)) == NULL
)
1241 typep
= alloc_utype (die_ref
, NULL
);
1244 case AT_mod_u_d_type
:
1245 typep
= decode_mod_u_d_type (scan
);
1248 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1249 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1260 decode_subscript_data_item -- decode array subscript item
1264 static struct type *
1265 decode_subscript_data_item (char *scan, char *end)
1269 The array subscripts and the data type of the elements of an
1270 array are described by a list of data items, stored as a block
1271 of contiguous bytes. There is a data item describing each array
1272 dimension, and a final data item describing the element type.
1273 The data items are ordered the same as their appearance in the
1274 source (I.E. leftmost dimension first, next to leftmost second,
1277 The data items describing each array dimension consist of four
1278 parts: (1) a format specifier, (2) type type of the subscript
1279 index, (3) a description of the low bound of the array dimension,
1280 and (4) a description of the high bound of the array dimension.
1282 The last data item is the description of the type of each of
1285 We are passed a pointer to the start of the block of bytes
1286 containing the remaining data items, and a pointer to the first
1287 byte past the data. This function recursively decodes the
1288 remaining data items and returns a type.
1290 If we somehow fail to decode some data, we complain about it
1291 and return a type "array of int".
1294 FIXME: This code only implements the forms currently used
1295 by the AT&T and GNU C compilers.
1297 The end pointer is supplied for error checking, maybe we should
1301 static struct type
*
1302 decode_subscript_data_item (scan
, end
)
1306 struct type
*typep
= NULL
; /* Array type we are building */
1307 struct type
*nexttype
; /* Type of each element (may be array) */
1308 struct type
*indextype
; /* Type of this index */
1309 struct type
*rangetype
;
1310 unsigned int format
;
1311 unsigned short fundtype
;
1312 unsigned long lowbound
;
1313 unsigned long highbound
;
1316 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1318 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1322 typep
= decode_array_element_type (scan
);
1325 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1327 indextype
= decode_fund_type (fundtype
);
1328 scan
+= SIZEOF_FMT_FT
;
1329 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1330 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1332 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1334 nexttype
= decode_subscript_data_item (scan
, end
);
1335 if (nexttype
== NULL
)
1337 /* Munged subscript data or other problem, fake it. */
1338 complain (&subscript_data_items
, DIE_ID
, DIE_NAME
);
1339 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1341 rangetype
= create_range_type ((struct type
*) NULL
, indextype
,
1342 lowbound
, highbound
);
1343 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1352 complain (&unhandled_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1353 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1354 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1355 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1358 complain (&unknown_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1359 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1360 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1361 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1371 dwarf_read_array_type -- read TAG_array_type DIE
1375 static void dwarf_read_array_type (struct dieinfo *dip)
1379 Extract all information from a TAG_array_type DIE and add to
1380 the user defined type vector.
1384 dwarf_read_array_type (dip
)
1385 struct dieinfo
*dip
;
1391 unsigned short blocksz
;
1394 if (dip
-> at_ordering
!= ORD_row_major
)
1396 /* FIXME: Can gdb even handle column major arrays? */
1397 complain (¬_row_major
, DIE_ID
, DIE_NAME
);
1399 if ((sub
= dip
-> at_subscr_data
) != NULL
)
1401 nbytes
= attribute_size (AT_subscr_data
);
1402 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1403 subend
= sub
+ nbytes
+ blocksz
;
1405 type
= decode_subscript_data_item (sub
, subend
);
1406 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1408 /* Install user defined type that has not been referenced yet. */
1409 alloc_utype (dip
-> die_ref
, type
);
1411 else if (TYPE_CODE (utype
) == TYPE_CODE_UNDEF
)
1413 /* Ick! A forward ref has already generated a blank type in our
1414 slot, and this type probably already has things pointing to it
1415 (which is what caused it to be created in the first place).
1416 If it's just a place holder we can plop our fully defined type
1417 on top of it. We can't recover the space allocated for our
1418 new type since it might be on an obstack, but we could reuse
1419 it if we kept a list of them, but it might not be worth it
1425 /* Double ick! Not only is a type already in our slot, but
1426 someone has decorated it. Complain and leave it alone. */
1427 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1436 read_tag_pointer_type -- read TAG_pointer_type DIE
1440 static void read_tag_pointer_type (struct dieinfo *dip)
1444 Extract all information from a TAG_pointer_type DIE and add to
1445 the user defined type vector.
1449 read_tag_pointer_type (dip
)
1450 struct dieinfo
*dip
;
1455 type
= decode_die_type (dip
);
1456 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1458 utype
= lookup_pointer_type (type
);
1459 alloc_utype (dip
-> die_ref
, utype
);
1463 TYPE_TARGET_TYPE (utype
) = type
;
1464 TYPE_POINTER_TYPE (type
) = utype
;
1466 /* We assume the machine has only one representation for pointers! */
1467 /* FIXME: This confuses host<->target data representations, and is a
1468 poor assumption besides. */
1470 TYPE_LENGTH (utype
) = sizeof (char *);
1471 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1479 read_tag_string_type -- read TAG_string_type DIE
1483 static void read_tag_string_type (struct dieinfo *dip)
1487 Extract all information from a TAG_string_type DIE and add to
1488 the user defined type vector. It isn't really a user defined
1489 type, but it behaves like one, with other DIE's using an
1490 AT_user_def_type attribute to reference it.
1494 read_tag_string_type (dip
)
1495 struct dieinfo
*dip
;
1498 struct type
*indextype
;
1499 struct type
*rangetype
;
1500 unsigned long lowbound
= 0;
1501 unsigned long highbound
;
1503 if (dip
-> has_at_byte_size
)
1505 /* A fixed bounds string */
1506 highbound
= dip
-> at_byte_size
- 1;
1510 /* A varying length string. Stub for now. (FIXME) */
1513 indextype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1514 rangetype
= create_range_type ((struct type
*) NULL
, indextype
, lowbound
,
1517 utype
= lookup_utype (dip
-> die_ref
);
1520 /* No type defined, go ahead and create a blank one to use. */
1521 utype
= alloc_utype (dip
-> die_ref
, (struct type
*) NULL
);
1525 /* Already a type in our slot due to a forward reference. Make sure it
1526 is a blank one. If not, complain and leave it alone. */
1527 if (TYPE_CODE (utype
) != TYPE_CODE_UNDEF
)
1529 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1534 /* Create the string type using the blank type we either found or created. */
1535 utype
= create_string_type (utype
, rangetype
);
1542 read_subroutine_type -- process TAG_subroutine_type dies
1546 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1551 Handle DIES due to C code like:
1554 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1560 The parameter DIES are currently ignored. See if gdb has a way to
1561 include this info in it's type system, and decode them if so. Is
1562 this what the type structure's "arg_types" field is for? (FIXME)
1566 read_subroutine_type (dip
, thisdie
, enddie
)
1567 struct dieinfo
*dip
;
1571 struct type
*type
; /* Type that this function returns */
1572 struct type
*ftype
; /* Function that returns above type */
1574 /* Decode the type that this subroutine returns */
1576 type
= decode_die_type (dip
);
1578 /* Check to see if we already have a partially constructed user
1579 defined type for this DIE, from a forward reference. */
1581 if ((ftype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1583 /* This is the first reference to one of these types. Make
1584 a new one and place it in the user defined types. */
1585 ftype
= lookup_function_type (type
);
1586 alloc_utype (dip
-> die_ref
, ftype
);
1588 else if (TYPE_CODE (ftype
) == TYPE_CODE_UNDEF
)
1590 /* We have an existing partially constructed type, so bash it
1591 into the correct type. */
1592 TYPE_TARGET_TYPE (ftype
) = type
;
1593 TYPE_FUNCTION_TYPE (type
) = ftype
;
1594 TYPE_LENGTH (ftype
) = 1;
1595 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1599 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1607 read_enumeration -- process dies which define an enumeration
1611 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1612 char *enddie, struct objfile *objfile)
1616 Given a pointer to a die which begins an enumeration, process all
1617 the dies that define the members of the enumeration.
1621 Note that we need to call enum_type regardless of whether or not we
1622 have a symbol, since we might have an enum without a tag name (thus
1623 no symbol for the tagname).
1627 read_enumeration (dip
, thisdie
, enddie
, objfile
)
1628 struct dieinfo
*dip
;
1631 struct objfile
*objfile
;
1636 type
= enum_type (dip
, objfile
);
1637 sym
= new_symbol (dip
, objfile
);
1640 SYMBOL_TYPE (sym
) = type
;
1641 if (cu_language
== language_cplus
)
1643 synthesize_typedef (dip
, objfile
, type
);
1652 enum_type -- decode and return a type for an enumeration
1656 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1660 Given a pointer to a die information structure for the die which
1661 starts an enumeration, process all the dies that define the members
1662 of the enumeration and return a type pointer for the enumeration.
1664 At the same time, for each member of the enumeration, create a
1665 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1666 and give it the type of the enumeration itself.
1670 Note that the DWARF specification explicitly mandates that enum
1671 constants occur in reverse order from the source program order,
1672 for "consistency" and because this ordering is easier for many
1673 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1674 Entries). Because gdb wants to see the enum members in program
1675 source order, we have to ensure that the order gets reversed while
1676 we are processing them.
1679 static struct type
*
1680 enum_type (dip
, objfile
)
1681 struct dieinfo
*dip
;
1682 struct objfile
*objfile
;
1686 struct nextfield
*next
;
1689 struct nextfield
*list
= NULL
;
1690 struct nextfield
*new;
1695 unsigned short blocksz
;
1699 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1701 /* No forward references created an empty type, so install one now */
1702 type
= alloc_utype (dip
-> die_ref
, NULL
);
1704 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1705 /* Some compilers try to be helpful by inventing "fake" names for
1706 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1707 Thanks, but no thanks... */
1708 if (dip
-> at_name
!= NULL
1709 && *dip
-> at_name
!= '~'
1710 && *dip
-> at_name
!= '.')
1712 TYPE_TAG_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1713 "", "", dip
-> at_name
);
1715 if (dip
-> at_byte_size
!= 0)
1717 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1719 if ((scan
= dip
-> at_element_list
) != NULL
)
1721 if (dip
-> short_element_list
)
1723 nbytes
= attribute_size (AT_short_element_list
);
1727 nbytes
= attribute_size (AT_element_list
);
1729 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1730 listend
= scan
+ nbytes
+ blocksz
;
1732 while (scan
< listend
)
1734 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1737 list
-> field
.type
= NULL
;
1738 list
-> field
.bitsize
= 0;
1739 list
-> field
.bitpos
=
1740 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1742 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1743 list
-> field
.name
= obsavestring (scan
, strlen (scan
),
1744 &objfile
-> type_obstack
);
1745 scan
+= strlen (scan
) + 1;
1747 /* Handcraft a new symbol for this enum member. */
1748 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1749 sizeof (struct symbol
));
1750 memset (sym
, 0, sizeof (struct symbol
));
1751 SYMBOL_NAME (sym
) = create_name (list
-> field
.name
,
1752 &objfile
->symbol_obstack
);
1753 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
1754 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1755 SYMBOL_CLASS (sym
) = LOC_CONST
;
1756 SYMBOL_TYPE (sym
) = type
;
1757 SYMBOL_VALUE (sym
) = list
-> field
.bitpos
;
1758 add_symbol_to_list (sym
, list_in_scope
);
1760 /* Now create the vector of fields, and record how big it is. This is
1761 where we reverse the order, by pulling the members off the list in
1762 reverse order from how they were inserted. If we have no fields
1763 (this is apparently possible in C++) then skip building a field
1767 TYPE_NFIELDS (type
) = nfields
;
1768 TYPE_FIELDS (type
) = (struct field
*)
1769 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1770 /* Copy the saved-up fields into the field vector. */
1771 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
-> next
)
1773 TYPE_FIELD (type
, n
++) = list
-> field
;
1784 read_func_scope -- process all dies within a function scope
1788 Process all dies within a given function scope. We are passed
1789 a die information structure pointer DIP for the die which
1790 starts the function scope, and pointers into the raw die data
1791 that define the dies within the function scope.
1793 For now, we ignore lexical block scopes within the function.
1794 The problem is that AT&T cc does not define a DWARF lexical
1795 block scope for the function itself, while gcc defines a
1796 lexical block scope for the function. We need to think about
1797 how to handle this difference, or if it is even a problem.
1802 read_func_scope (dip
, thisdie
, enddie
, objfile
)
1803 struct dieinfo
*dip
;
1806 struct objfile
*objfile
;
1808 register struct context_stack
*new;
1810 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1811 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1813 objfile
-> ei
.entry_func_lowpc
= dip
-> at_low_pc
;
1814 objfile
-> ei
.entry_func_highpc
= dip
-> at_high_pc
;
1816 if (STREQ (dip
-> at_name
, "main")) /* FIXME: hardwired name */
1818 objfile
-> ei
.main_func_lowpc
= dip
-> at_low_pc
;
1819 objfile
-> ei
.main_func_highpc
= dip
-> at_high_pc
;
1821 new = push_context (0, dip
-> at_low_pc
);
1822 new -> name
= new_symbol (dip
, objfile
);
1823 list_in_scope
= &local_symbols
;
1824 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1825 new = pop_context ();
1826 /* Make a block for the local symbols within. */
1827 finish_block (new -> name
, &local_symbols
, new -> old_blocks
,
1828 new -> start_addr
, dip
-> at_high_pc
, objfile
);
1829 list_in_scope
= &file_symbols
;
1837 handle_producer -- process the AT_producer attribute
1841 Perform any operations that depend on finding a particular
1842 AT_producer attribute.
1847 handle_producer (producer
)
1851 /* If this compilation unit was compiled with g++ or gcc, then set the
1852 processing_gcc_compilation flag. */
1854 processing_gcc_compilation
=
1855 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
))
1856 || STREQN (producer
, CHILL_PRODUCER
, strlen (CHILL_PRODUCER
))
1857 || STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
));
1859 /* Select a demangling style if we can identify the producer and if
1860 the current style is auto. We leave the current style alone if it
1861 is not auto. We also leave the demangling style alone if we find a
1862 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1864 if (AUTO_DEMANGLING
)
1866 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1868 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1870 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1872 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1882 read_file_scope -- process all dies within a file scope
1886 Process all dies within a given file scope. We are passed a
1887 pointer to the die information structure for the die which
1888 starts the file scope, and pointers into the raw die data which
1889 mark the range of dies within the file scope.
1891 When the partial symbol table is built, the file offset for the line
1892 number table for each compilation unit is saved in the partial symbol
1893 table entry for that compilation unit. As the symbols for each
1894 compilation unit are read, the line number table is read into memory
1895 and the variable lnbase is set to point to it. Thus all we have to
1896 do is use lnbase to access the line number table for the current
1901 read_file_scope (dip
, thisdie
, enddie
, objfile
)
1902 struct dieinfo
*dip
;
1905 struct objfile
*objfile
;
1907 struct cleanup
*back_to
;
1908 struct symtab
*symtab
;
1910 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1911 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1913 objfile
-> ei
.entry_file_lowpc
= dip
-> at_low_pc
;
1914 objfile
-> ei
.entry_file_highpc
= dip
-> at_high_pc
;
1916 set_cu_language (dip
);
1917 if (dip
-> at_producer
!= NULL
)
1919 handle_producer (dip
-> at_producer
);
1921 numutypes
= (enddie
- thisdie
) / 4;
1922 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1923 back_to
= make_cleanup (free
, utypes
);
1924 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1925 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1926 start_symtab (dip
-> at_name
, dip
-> at_comp_dir
, dip
-> at_low_pc
);
1927 decode_line_numbers (lnbase
);
1928 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1930 symtab
= end_symtab (dip
-> at_high_pc
, 0, 0, objfile
, 0);
1933 symtab
-> language
= cu_language
;
1935 do_cleanups (back_to
);
1944 process_dies -- process a range of DWARF Information Entries
1948 static void process_dies (char *thisdie, char *enddie,
1949 struct objfile *objfile)
1953 Process all DIE's in a specified range. May be (and almost
1954 certainly will be) called recursively.
1958 process_dies (thisdie
, enddie
, objfile
)
1961 struct objfile
*objfile
;
1966 while (thisdie
< enddie
)
1968 basicdieinfo (&di
, thisdie
, objfile
);
1969 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1973 else if (di
.die_tag
== TAG_padding
)
1975 nextdie
= thisdie
+ di
.die_length
;
1979 completedieinfo (&di
, objfile
);
1980 if (di
.at_sibling
!= 0)
1982 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1986 nextdie
= thisdie
+ di
.die_length
;
1988 #ifdef SMASH_TEXT_ADDRESS
1989 /* I think that these are always text, not data, addresses. */
1990 SMASH_TEXT_ADDRESS (di
.at_low_pc
);
1991 SMASH_TEXT_ADDRESS (di
.at_high_pc
);
1995 case TAG_compile_unit
:
1996 /* Skip Tag_compile_unit if we are already inside a compilation
1997 unit, we are unable to handle nested compilation units
1998 properly (FIXME). */
1999 if (current_subfile
== NULL
)
2000 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
2002 nextdie
= thisdie
+ di
.die_length
;
2004 case TAG_global_subroutine
:
2005 case TAG_subroutine
:
2006 if (di
.has_at_low_pc
)
2008 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
2011 case TAG_lexical_block
:
2012 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
2014 case TAG_class_type
:
2015 case TAG_structure_type
:
2016 case TAG_union_type
:
2017 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
2019 case TAG_enumeration_type
:
2020 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
2022 case TAG_subroutine_type
:
2023 read_subroutine_type (&di
, thisdie
, nextdie
);
2025 case TAG_array_type
:
2026 dwarf_read_array_type (&di
);
2028 case TAG_pointer_type
:
2029 read_tag_pointer_type (&di
);
2031 case TAG_string_type
:
2032 read_tag_string_type (&di
);
2035 new_symbol (&di
, objfile
);
2047 decode_line_numbers -- decode a line number table fragment
2051 static void decode_line_numbers (char *tblscan, char *tblend,
2052 long length, long base, long line, long pc)
2056 Translate the DWARF line number information to gdb form.
2058 The ".line" section contains one or more line number tables, one for
2059 each ".line" section from the objects that were linked.
2061 The AT_stmt_list attribute for each TAG_source_file entry in the
2062 ".debug" section contains the offset into the ".line" section for the
2063 start of the table for that file.
2065 The table itself has the following structure:
2067 <table length><base address><source statement entry>
2068 4 bytes 4 bytes 10 bytes
2070 The table length is the total size of the table, including the 4 bytes
2071 for the length information.
2073 The base address is the address of the first instruction generated
2074 for the source file.
2076 Each source statement entry has the following structure:
2078 <line number><statement position><address delta>
2079 4 bytes 2 bytes 4 bytes
2081 The line number is relative to the start of the file, starting with
2084 The statement position either -1 (0xFFFF) or the number of characters
2085 from the beginning of the line to the beginning of the statement.
2087 The address delta is the difference between the base address and
2088 the address of the first instruction for the statement.
2090 Note that we must copy the bytes from the packed table to our local
2091 variables before attempting to use them, to avoid alignment problems
2092 on some machines, particularly RISC processors.
2096 Does gdb expect the line numbers to be sorted? They are now by
2097 chance/luck, but are not required to be. (FIXME)
2099 The line with number 0 is unused, gdb apparently can discover the
2100 span of the last line some other way. How? (FIXME)
2104 decode_line_numbers (linetable
)
2109 unsigned long length
;
2114 if (linetable
!= NULL
)
2116 tblscan
= tblend
= linetable
;
2117 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2119 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2121 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2122 GET_UNSIGNED
, current_objfile
);
2123 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2125 while (tblscan
< tblend
)
2127 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2129 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2130 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2132 tblscan
+= SIZEOF_LINETBL_DELTA
;
2136 record_line (current_subfile
, line
, pc
);
2146 locval -- compute the value of a location attribute
2150 static int locval (char *loc)
2154 Given pointer to a string of bytes that define a location, compute
2155 the location and return the value.
2157 When computing values involving the current value of the frame pointer,
2158 the value zero is used, which results in a value relative to the frame
2159 pointer, rather than the absolute value. This is what GDB wants
2162 When the result is a register number, the global isreg flag is set,
2163 otherwise it is cleared. This is a kludge until we figure out a better
2164 way to handle the problem. Gdb's design does not mesh well with the
2165 DWARF notion of a location computing interpreter, which is a shame
2166 because the flexibility goes unused.
2170 Note that stack[0] is unused except as a default error return.
2171 Note that stack overflow is not yet handled.
2178 unsigned short nbytes
;
2179 unsigned short locsize
;
2180 auto long stack
[64];
2186 nbytes
= attribute_size (AT_location
);
2187 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2189 end
= loc
+ locsize
;
2194 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2197 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2199 loc
+= SIZEOF_LOC_ATOM_CODE
;
2200 switch (loc_atom_code
)
2207 /* push register (number) */
2208 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2209 GET_UNSIGNED
, current_objfile
);
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 init_psymbol_list -- initialize storage for partial symbols
2478 static void init_psymbol_list (struct objfile *objfile, int total_symbols)
2482 Initializes storage for all of the partial symbols that will be
2483 created by dwarf_build_psymtabs and subsidiaries.
2487 init_psymbol_list (objfile
, total_symbols
)
2488 struct objfile
*objfile
;
2491 /* Free any previously allocated psymbol lists. */
2493 if (objfile
-> global_psymbols
.list
)
2495 mfree (objfile
-> md
, (PTR
)objfile
-> global_psymbols
.list
);
2497 if (objfile
-> static_psymbols
.list
)
2499 mfree (objfile
-> md
, (PTR
)objfile
-> static_psymbols
.list
);
2502 /* Current best guess is that there are approximately a twentieth
2503 of the total symbols (in a debugging file) are global or static
2506 objfile
-> global_psymbols
.size
= total_symbols
/ 10;
2507 objfile
-> static_psymbols
.size
= total_symbols
/ 10;
2508 objfile
-> global_psymbols
.next
=
2509 objfile
-> global_psymbols
.list
= (struct partial_symbol
*)
2510 xmmalloc (objfile
-> md
, objfile
-> global_psymbols
.size
2511 * sizeof (struct partial_symbol
));
2512 objfile
-> static_psymbols
.next
=
2513 objfile
-> static_psymbols
.list
= (struct partial_symbol
*)
2514 xmmalloc (objfile
-> md
, objfile
-> static_psymbols
.size
2515 * sizeof (struct partial_symbol
));
2522 add_enum_psymbol -- add enumeration members to partial symbol table
2526 Given pointer to a DIE that is known to be for an enumeration,
2527 extract the symbolic names of the enumeration members and add
2528 partial symbols for them.
2532 add_enum_psymbol (dip
, objfile
)
2533 struct dieinfo
*dip
;
2534 struct objfile
*objfile
;
2538 unsigned short blocksz
;
2541 if ((scan
= dip
-> at_element_list
) != NULL
)
2543 if (dip
-> short_element_list
)
2545 nbytes
= attribute_size (AT_short_element_list
);
2549 nbytes
= attribute_size (AT_element_list
);
2551 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2553 listend
= scan
+ blocksz
;
2554 while (scan
< listend
)
2556 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2557 ADD_PSYMBOL_TO_LIST (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2558 objfile
-> static_psymbols
, 0, cu_language
,
2560 scan
+= strlen (scan
) + 1;
2569 add_partial_symbol -- add symbol to partial symbol table
2573 Given a DIE, if it is one of the types that we want to
2574 add to a partial symbol table, finish filling in the die info
2575 and then add a partial symbol table entry for it.
2579 The caller must ensure that the DIE has a valid name attribute.
2583 add_partial_symbol (dip
, objfile
)
2584 struct dieinfo
*dip
;
2585 struct objfile
*objfile
;
2587 switch (dip
-> die_tag
)
2589 case TAG_global_subroutine
:
2590 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2591 VAR_NAMESPACE
, LOC_BLOCK
,
2592 objfile
-> global_psymbols
,
2593 dip
-> at_low_pc
, cu_language
, objfile
);
2595 case TAG_global_variable
:
2596 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2597 VAR_NAMESPACE
, LOC_STATIC
,
2598 objfile
-> global_psymbols
,
2599 0, cu_language
, objfile
);
2601 case TAG_subroutine
:
2602 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2603 VAR_NAMESPACE
, LOC_BLOCK
,
2604 objfile
-> static_psymbols
,
2605 dip
-> at_low_pc
, cu_language
, objfile
);
2607 case TAG_local_variable
:
2608 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2609 VAR_NAMESPACE
, LOC_STATIC
,
2610 objfile
-> static_psymbols
,
2611 0, cu_language
, objfile
);
2614 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2615 VAR_NAMESPACE
, LOC_TYPEDEF
,
2616 objfile
-> static_psymbols
,
2617 0, cu_language
, objfile
);
2619 case TAG_class_type
:
2620 case TAG_structure_type
:
2621 case TAG_union_type
:
2622 case TAG_enumeration_type
:
2623 /* Do not add opaque aggregate definitions to the psymtab. */
2624 if (!dip
-> has_at_byte_size
)
2626 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2627 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2628 objfile
-> static_psymbols
,
2629 0, cu_language
, objfile
);
2630 if (cu_language
== language_cplus
)
2632 /* For C++, these implicitly act as typedefs as well. */
2633 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2634 VAR_NAMESPACE
, LOC_TYPEDEF
,
2635 objfile
-> static_psymbols
,
2636 0, cu_language
, objfile
);
2646 scan_partial_symbols -- scan DIE's within a single compilation unit
2650 Process the DIE's within a single compilation unit, looking for
2651 interesting DIE's that contribute to the partial symbol table entry
2652 for this compilation unit.
2656 There are some DIE's that may appear both at file scope and within
2657 the scope of a function. We are only interested in the ones at file
2658 scope, and the only way to tell them apart is to keep track of the
2659 scope. For example, consider the test case:
2664 for which the relevant DWARF segment has the structure:
2667 0x23 global subrtn sibling 0x9b
2669 fund_type FT_integer
2674 0x23 local var sibling 0x97
2676 fund_type FT_integer
2677 location OP_BASEREG 0xe
2684 0x1d local var sibling 0xb8
2686 fund_type FT_integer
2687 location OP_ADDR 0x800025dc
2692 We want to include the symbol 'i' in the partial symbol table, but
2693 not the symbol 'j'. In essence, we want to skip all the dies within
2694 the scope of a TAG_global_subroutine DIE.
2696 Don't attempt to add anonymous structures or unions since they have
2697 no name. Anonymous enumerations however are processed, because we
2698 want to extract their member names (the check for a tag name is
2701 Also, for variables and subroutines, check that this is the place
2702 where the actual definition occurs, rather than just a reference
2707 scan_partial_symbols (thisdie
, enddie
, objfile
)
2710 struct objfile
*objfile
;
2716 while (thisdie
< enddie
)
2718 basicdieinfo (&di
, thisdie
, objfile
);
2719 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2725 nextdie
= thisdie
+ di
.die_length
;
2726 /* To avoid getting complete die information for every die, we
2727 only do it (below) for the cases we are interested in. */
2730 case TAG_global_subroutine
:
2731 case TAG_subroutine
:
2732 completedieinfo (&di
, objfile
);
2733 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2735 add_partial_symbol (&di
, objfile
);
2736 /* If there is a sibling attribute, adjust the nextdie
2737 pointer to skip the entire scope of the subroutine.
2738 Apply some sanity checking to make sure we don't
2739 overrun or underrun the range of remaining DIE's */
2740 if (di
.at_sibling
!= 0)
2742 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2743 if ((temp
< thisdie
) || (temp
>= enddie
))
2745 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
,
2755 case TAG_global_variable
:
2756 case TAG_local_variable
:
2757 completedieinfo (&di
, objfile
);
2758 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2760 add_partial_symbol (&di
, objfile
);
2764 case TAG_class_type
:
2765 case TAG_structure_type
:
2766 case TAG_union_type
:
2767 completedieinfo (&di
, objfile
);
2770 add_partial_symbol (&di
, objfile
);
2773 case TAG_enumeration_type
:
2774 completedieinfo (&di
, objfile
);
2777 add_partial_symbol (&di
, objfile
);
2779 add_enum_psymbol (&di
, objfile
);
2791 scan_compilation_units -- build a psymtab entry for each compilation
2795 This is the top level dwarf parsing routine for building partial
2798 It scans from the beginning of the DWARF table looking for the first
2799 TAG_compile_unit DIE, and then follows the sibling chain to locate
2800 each additional TAG_compile_unit DIE.
2802 For each TAG_compile_unit DIE it creates a partial symtab structure,
2803 calls a subordinate routine to collect all the compilation unit's
2804 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2805 new partial symtab structure into the partial symbol table. It also
2806 records the appropriate information in the partial symbol table entry
2807 to allow the chunk of DIE's and line number table for this compilation
2808 unit to be located and re-read later, to generate a complete symbol
2809 table entry for the compilation unit.
2811 Thus it effectively partitions up a chunk of DIE's for multiple
2812 compilation units into smaller DIE chunks and line number tables,
2813 and associates them with a partial symbol table entry.
2817 If any compilation unit has no line number table associated with
2818 it for some reason (a missing at_stmt_list attribute, rather than
2819 just one with a value of zero, which is valid) then we ensure that
2820 the recorded file offset is zero so that the routine which later
2821 reads line number table fragments knows that there is no fragment
2831 scan_compilation_units (thisdie
, enddie
, dbfoff
, lnoffset
, objfile
)
2836 struct objfile
*objfile
;
2840 struct partial_symtab
*pst
;
2843 file_ptr curlnoffset
;
2845 while (thisdie
< enddie
)
2847 basicdieinfo (&di
, thisdie
, objfile
);
2848 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2852 else if (di
.die_tag
!= TAG_compile_unit
)
2854 nextdie
= thisdie
+ di
.die_length
;
2858 completedieinfo (&di
, objfile
);
2859 set_cu_language (&di
);
2860 if (di
.at_sibling
!= 0)
2862 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2866 nextdie
= thisdie
+ di
.die_length
;
2868 curoff
= thisdie
- dbbase
;
2869 culength
= nextdie
- thisdie
;
2870 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2872 /* First allocate a new partial symbol table structure */
2874 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2875 di
.at_name
, di
.at_low_pc
,
2876 objfile
-> global_psymbols
.next
,
2877 objfile
-> static_psymbols
.next
);
2879 pst
-> texthigh
= di
.at_high_pc
;
2880 pst
-> read_symtab_private
= (char *)
2881 obstack_alloc (&objfile
-> psymbol_obstack
,
2882 sizeof (struct dwfinfo
));
2883 DBFOFF (pst
) = dbfoff
;
2884 DBROFF (pst
) = curoff
;
2885 DBLENGTH (pst
) = culength
;
2886 LNFOFF (pst
) = curlnoffset
;
2887 pst
-> read_symtab
= dwarf_psymtab_to_symtab
;
2889 /* Now look for partial symbols */
2891 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2893 pst
-> n_global_syms
= objfile
-> global_psymbols
.next
-
2894 (objfile
-> global_psymbols
.list
+ pst
-> globals_offset
);
2895 pst
-> n_static_syms
= objfile
-> static_psymbols
.next
-
2896 (objfile
-> static_psymbols
.list
+ pst
-> statics_offset
);
2897 sort_pst_symbols (pst
);
2898 /* If there is already a psymtab or symtab for a file of this name,
2899 remove it. (If there is a symtab, more drastic things also
2900 happen.) This happens in VxWorks. */
2901 free_named_symtabs (pst
-> filename
);
2911 new_symbol -- make a symbol table entry for a new symbol
2915 static struct symbol *new_symbol (struct dieinfo *dip,
2916 struct objfile *objfile)
2920 Given a pointer to a DWARF information entry, figure out if we need
2921 to make a symbol table entry for it, and if so, create a new entry
2922 and return a pointer to it.
2925 static struct symbol
*
2926 new_symbol (dip
, objfile
)
2927 struct dieinfo
*dip
;
2928 struct objfile
*objfile
;
2930 struct symbol
*sym
= NULL
;
2932 if (dip
-> at_name
!= NULL
)
2934 sym
= (struct symbol
*) obstack_alloc (&objfile
-> symbol_obstack
,
2935 sizeof (struct symbol
));
2936 memset (sym
, 0, sizeof (struct symbol
));
2937 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2938 &objfile
->symbol_obstack
);
2939 /* default assumptions */
2940 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2941 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2942 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2944 /* If this symbol is from a C++ compilation, then attempt to cache the
2945 demangled form for future reference. This is a typical time versus
2946 space tradeoff, that was decided in favor of time because it sped up
2947 C++ symbol lookups by a factor of about 20. */
2949 SYMBOL_LANGUAGE (sym
) = cu_language
;
2950 SYMBOL_INIT_DEMANGLED_NAME (sym
, &objfile
-> symbol_obstack
);
2951 switch (dip
-> die_tag
)
2954 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2955 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2957 case TAG_global_subroutine
:
2958 case TAG_subroutine
:
2959 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2960 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2961 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2962 if (dip
-> die_tag
== TAG_global_subroutine
)
2964 add_symbol_to_list (sym
, &global_symbols
);
2968 add_symbol_to_list (sym
, list_in_scope
);
2971 case TAG_global_variable
:
2972 if (dip
-> at_location
!= NULL
)
2974 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2975 add_symbol_to_list (sym
, &global_symbols
);
2976 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2977 SYMBOL_VALUE (sym
) += baseaddr
;
2980 case TAG_local_variable
:
2981 if (dip
-> at_location
!= NULL
)
2983 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2984 add_symbol_to_list (sym
, list_in_scope
);
2987 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2991 SYMBOL_CLASS (sym
) = LOC_BASEREG
;
2992 SYMBOL_BASEREG (sym
) = basereg
;
2996 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2997 SYMBOL_VALUE (sym
) += baseaddr
;
3001 case TAG_formal_parameter
:
3002 if (dip
-> at_location
!= NULL
)
3004 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
3006 add_symbol_to_list (sym
, list_in_scope
);
3009 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
3013 SYMBOL_CLASS (sym
) = LOC_BASEREG_ARG
;
3014 SYMBOL_BASEREG (sym
) = basereg
;
3018 SYMBOL_CLASS (sym
) = LOC_ARG
;
3021 case TAG_unspecified_parameters
:
3022 /* From varargs functions; gdb doesn't seem to have any interest in
3023 this information, so just ignore it for now. (FIXME?) */
3025 case TAG_class_type
:
3026 case TAG_structure_type
:
3027 case TAG_union_type
:
3028 case TAG_enumeration_type
:
3029 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3030 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
3031 add_symbol_to_list (sym
, list_in_scope
);
3034 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3035 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3036 add_symbol_to_list (sym
, list_in_scope
);
3039 /* Not a tag we recognize. Hopefully we aren't processing trash
3040 data, but since we must specifically ignore things we don't
3041 recognize, there is nothing else we should do at this point. */
3052 synthesize_typedef -- make a symbol table entry for a "fake" typedef
3056 static void synthesize_typedef (struct dieinfo *dip,
3057 struct objfile *objfile,
3062 Given a pointer to a DWARF information entry, synthesize a typedef
3063 for the name in the DIE, using the specified type.
3065 This is used for C++ class, structs, unions, and enumerations to
3066 set up the tag name as a type.
3071 synthesize_typedef (dip
, objfile
, type
)
3072 struct dieinfo
*dip
;
3073 struct objfile
*objfile
;
3076 struct symbol
*sym
= NULL
;
3078 if (dip
-> at_name
!= NULL
)
3080 sym
= (struct symbol
*)
3081 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symbol
));
3082 memset (sym
, 0, sizeof (struct symbol
));
3083 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
3084 &objfile
->symbol_obstack
);
3085 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
3086 SYMBOL_TYPE (sym
) = type
;
3087 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3088 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3089 add_symbol_to_list (sym
, list_in_scope
);
3097 decode_mod_fund_type -- decode a modified fundamental type
3101 static struct type *decode_mod_fund_type (char *typedata)
3105 Decode a block of data containing a modified fundamental
3106 type specification. TYPEDATA is a pointer to the block,
3107 which starts with a length containing the size of the rest
3108 of the block. At the end of the block is a fundmental type
3109 code value that gives the fundamental type. Everything
3110 in between are type modifiers.
3112 We simply compute the number of modifiers and call the general
3113 function decode_modified_type to do the actual work.
3116 static struct type
*
3117 decode_mod_fund_type (typedata
)
3120 struct type
*typep
= NULL
;
3121 unsigned short modcount
;
3124 /* Get the total size of the block, exclusive of the size itself */
3126 nbytes
= attribute_size (AT_mod_fund_type
);
3127 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3130 /* Deduct the size of the fundamental type bytes at the end of the block. */
3132 modcount
-= attribute_size (AT_fund_type
);
3134 /* Now do the actual decoding */
3136 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3144 decode_mod_u_d_type -- decode a modified user defined type
3148 static struct type *decode_mod_u_d_type (char *typedata)
3152 Decode a block of data containing a modified user defined
3153 type specification. TYPEDATA is a pointer to the block,
3154 which consists of a two byte length, containing the size
3155 of the rest of the block. At the end of the block is a
3156 four byte value that gives a reference to a user defined type.
3157 Everything in between are type modifiers.
3159 We simply compute the number of modifiers and call the general
3160 function decode_modified_type to do the actual work.
3163 static struct type
*
3164 decode_mod_u_d_type (typedata
)
3167 struct type
*typep
= NULL
;
3168 unsigned short modcount
;
3171 /* Get the total size of the block, exclusive of the size itself */
3173 nbytes
= attribute_size (AT_mod_u_d_type
);
3174 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3177 /* Deduct the size of the reference type bytes at the end of the block. */
3179 modcount
-= attribute_size (AT_user_def_type
);
3181 /* Now do the actual decoding */
3183 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3191 decode_modified_type -- decode modified user or fundamental type
3195 static struct type *decode_modified_type (char *modifiers,
3196 unsigned short modcount, int mtype)
3200 Decode a modified type, either a modified fundamental type or
3201 a modified user defined type. MODIFIERS is a pointer to the
3202 block of bytes that define MODCOUNT modifiers. Immediately
3203 following the last modifier is a short containing the fundamental
3204 type or a long containing the reference to the user defined
3205 type. Which one is determined by MTYPE, which is either
3206 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3207 type we are generating.
3209 We call ourself recursively to generate each modified type,`
3210 until MODCOUNT reaches zero, at which point we have consumed
3211 all the modifiers and generate either the fundamental type or
3212 user defined type. When the recursion unwinds, each modifier
3213 is applied in turn to generate the full modified type.
3217 If we find a modifier that we don't recognize, and it is not one
3218 of those reserved for application specific use, then we issue a
3219 warning and simply ignore the modifier.
3223 We currently ignore MOD_const and MOD_volatile. (FIXME)
3227 static struct type
*
3228 decode_modified_type (modifiers
, modcount
, mtype
)
3230 unsigned int modcount
;
3233 struct type
*typep
= NULL
;
3234 unsigned short fundtype
;
3243 case AT_mod_fund_type
:
3244 nbytes
= attribute_size (AT_fund_type
);
3245 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3247 typep
= decode_fund_type (fundtype
);
3249 case AT_mod_u_d_type
:
3250 nbytes
= attribute_size (AT_user_def_type
);
3251 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3253 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3255 typep
= alloc_utype (die_ref
, NULL
);
3259 complain (&botched_modified_type
, DIE_ID
, DIE_NAME
, mtype
);
3260 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3266 modifier
= *modifiers
++;
3267 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3270 case MOD_pointer_to
:
3271 typep
= lookup_pointer_type (typep
);
3273 case MOD_reference_to
:
3274 typep
= lookup_reference_type (typep
);
3277 complain (&const_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3280 complain (&volatile_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3283 if (!(MOD_lo_user
<= (unsigned char) modifier
3284 && (unsigned char) modifier
<= MOD_hi_user
))
3286 complain (&unknown_type_modifier
, DIE_ID
, DIE_NAME
, modifier
);
3298 decode_fund_type -- translate basic DWARF type to gdb base type
3302 Given an integer that is one of the fundamental DWARF types,
3303 translate it to one of the basic internal gdb types and return
3304 a pointer to the appropriate gdb type (a "struct type *").
3308 For robustness, if we are asked to translate a fundamental
3309 type that we are unprepared to deal with, we return int so
3310 callers can always depend upon a valid type being returned,
3311 and so gdb may at least do something reasonable by default.
3312 If the type is not in the range of those types defined as
3313 application specific types, we also issue a warning.
3316 static struct type
*
3317 decode_fund_type (fundtype
)
3318 unsigned int fundtype
;
3320 struct type
*typep
= NULL
;
3326 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3329 case FT_boolean
: /* Was FT_set in AT&T version */
3330 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3333 case FT_pointer
: /* (void *) */
3334 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3335 typep
= lookup_pointer_type (typep
);
3339 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3342 case FT_signed_char
:
3343 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3346 case FT_unsigned_char
:
3347 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3351 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3354 case FT_signed_short
:
3355 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3358 case FT_unsigned_short
:
3359 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3363 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3366 case FT_signed_integer
:
3367 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3370 case FT_unsigned_integer
:
3371 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3375 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3378 case FT_signed_long
:
3379 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3382 case FT_unsigned_long
:
3383 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3387 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3390 case FT_signed_long_long
:
3391 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3394 case FT_unsigned_long_long
:
3395 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3399 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3402 case FT_dbl_prec_float
:
3403 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3406 case FT_ext_prec_float
:
3407 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3411 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3414 case FT_dbl_prec_complex
:
3415 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3418 case FT_ext_prec_complex
:
3419 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3426 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3427 if (!(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3429 complain (&unexpected_fund_type
, DIE_ID
, DIE_NAME
, fundtype
);
3440 create_name -- allocate a fresh copy of a string on an obstack
3444 Given a pointer to a string and a pointer to an obstack, allocates
3445 a fresh copy of the string on the specified obstack.
3450 create_name (name
, obstackp
)
3452 struct obstack
*obstackp
;
3457 length
= strlen (name
) + 1;
3458 newname
= (char *) obstack_alloc (obstackp
, length
);
3459 strcpy (newname
, name
);
3467 basicdieinfo -- extract the minimal die info from raw die data
3471 void basicdieinfo (char *diep, struct dieinfo *dip,
3472 struct objfile *objfile)
3476 Given a pointer to raw DIE data, and a pointer to an instance of a
3477 die info structure, this function extracts the basic information
3478 from the DIE data required to continue processing this DIE, along
3479 with some bookkeeping information about the DIE.
3481 The information we absolutely must have includes the DIE tag,
3482 and the DIE length. If we need the sibling reference, then we
3483 will have to call completedieinfo() to process all the remaining
3486 Note that since there is no guarantee that the data is properly
3487 aligned in memory for the type of access required (indirection
3488 through anything other than a char pointer), and there is no
3489 guarantee that it is in the same byte order as the gdb host,
3490 we call a function which deals with both alignment and byte
3491 swapping issues. Possibly inefficient, but quite portable.
3493 We also take care of some other basic things at this point, such
3494 as ensuring that the instance of the die info structure starts
3495 out completely zero'd and that curdie is initialized for use
3496 in error reporting if we have a problem with the current die.
3500 All DIE's must have at least a valid length, thus the minimum
3501 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3502 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3503 are forced to be TAG_padding DIES.
3505 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3506 that if a padding DIE is used for alignment and the amount needed is
3507 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3508 enough to align to the next alignment boundry.
3510 We do some basic sanity checking here, such as verifying that the
3511 length of the die would not cause it to overrun the recorded end of
3512 the buffer holding the DIE info. If we find a DIE that is either
3513 too small or too large, we force it's length to zero which should
3514 cause the caller to take appropriate action.
3518 basicdieinfo (dip
, diep
, objfile
)
3519 struct dieinfo
*dip
;
3521 struct objfile
*objfile
;
3524 memset (dip
, 0, sizeof (struct dieinfo
));
3526 dip
-> die_ref
= dbroff
+ (diep
- dbbase
);
3527 dip
-> die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3529 if ((dip
-> die_length
< SIZEOF_DIE_LENGTH
) ||
3530 ((diep
+ dip
-> die_length
) > (dbbase
+ dbsize
)))
3532 complain (&malformed_die
, DIE_ID
, DIE_NAME
, dip
-> die_length
);
3533 dip
-> die_length
= 0;
3535 else if (dip
-> die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3537 dip
-> die_tag
= TAG_padding
;
3541 diep
+= SIZEOF_DIE_LENGTH
;
3542 dip
-> die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3551 completedieinfo -- finish reading the information for a given DIE
3555 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3559 Given a pointer to an already partially initialized die info structure,
3560 scan the raw DIE data and finish filling in the die info structure
3561 from the various attributes found.
3563 Note that since there is no guarantee that the data is properly
3564 aligned in memory for the type of access required (indirection
3565 through anything other than a char pointer), and there is no
3566 guarantee that it is in the same byte order as the gdb host,
3567 we call a function which deals with both alignment and byte
3568 swapping issues. Possibly inefficient, but quite portable.
3572 Each time we are called, we increment the diecount variable, which
3573 keeps an approximate count of the number of dies processed for
3574 each compilation unit. This information is presented to the user
3575 if the info_verbose flag is set.
3580 completedieinfo (dip
, objfile
)
3581 struct dieinfo
*dip
;
3582 struct objfile
*objfile
;
3584 char *diep
; /* Current pointer into raw DIE data */
3585 char *end
; /* Terminate DIE scan here */
3586 unsigned short attr
; /* Current attribute being scanned */
3587 unsigned short form
; /* Form of the attribute */
3588 int nbytes
; /* Size of next field to read */
3592 end
= diep
+ dip
-> die_length
;
3593 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3596 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3597 diep
+= SIZEOF_ATTRIBUTE
;
3598 if ((nbytes
= attribute_size (attr
)) == -1)
3600 complain (&unknown_attribute_length
, DIE_ID
, DIE_NAME
);
3607 dip
-> at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3611 dip
-> at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3615 dip
-> at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3619 dip
-> at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3623 dip
-> at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3625 dip
-> has_at_stmt_list
= 1;
3628 dip
-> at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3630 dip
-> at_low_pc
+= baseaddr
;
3631 dip
-> has_at_low_pc
= 1;
3634 dip
-> at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3636 dip
-> at_high_pc
+= baseaddr
;
3639 dip
-> at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3642 case AT_user_def_type
:
3643 dip
-> at_user_def_type
= target_to_host (diep
, nbytes
,
3644 GET_UNSIGNED
, objfile
);
3647 dip
-> at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3649 dip
-> has_at_byte_size
= 1;
3652 dip
-> at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3656 dip
-> at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3660 dip
-> at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3664 dip
-> at_location
= diep
;
3666 case AT_mod_fund_type
:
3667 dip
-> at_mod_fund_type
= diep
;
3669 case AT_subscr_data
:
3670 dip
-> at_subscr_data
= diep
;
3672 case AT_mod_u_d_type
:
3673 dip
-> at_mod_u_d_type
= diep
;
3675 case AT_element_list
:
3676 dip
-> at_element_list
= diep
;
3677 dip
-> short_element_list
= 0;
3679 case AT_short_element_list
:
3680 dip
-> at_element_list
= diep
;
3681 dip
-> short_element_list
= 1;
3683 case AT_discr_value
:
3684 dip
-> at_discr_value
= diep
;
3686 case AT_string_length
:
3687 dip
-> at_string_length
= diep
;
3690 dip
-> at_name
= diep
;
3693 /* For now, ignore any "hostname:" portion, since gdb doesn't
3694 know how to deal with it. (FIXME). */
3695 dip
-> at_comp_dir
= strrchr (diep
, ':');
3696 if (dip
-> at_comp_dir
!= NULL
)
3698 dip
-> at_comp_dir
++;
3702 dip
-> at_comp_dir
= diep
;
3706 dip
-> at_producer
= diep
;
3708 case AT_start_scope
:
3709 dip
-> at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3712 case AT_stride_size
:
3713 dip
-> at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3717 dip
-> at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3721 dip
-> at_prototyped
= diep
;
3724 /* Found an attribute that we are unprepared to handle. However
3725 it is specifically one of the design goals of DWARF that
3726 consumers should ignore unknown attributes. As long as the
3727 form is one that we recognize (so we know how to skip it),
3728 we can just ignore the unknown attribute. */
3731 form
= FORM_FROM_ATTR (attr
);
3745 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3748 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3751 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3754 diep
+= strlen (diep
) + 1;
3757 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);
3768 target_to_host -- swap in target data to host
3772 target_to_host (char *from, int nbytes, int signextend,
3773 struct objfile *objfile)
3777 Given pointer to data in target format in FROM, a byte count for
3778 the size of the data in NBYTES, a flag indicating whether or not
3779 the data is signed in SIGNEXTEND, and a pointer to the current
3780 objfile in OBJFILE, convert the data to host format and return
3781 the converted value.
3785 FIXME: If we read data that is known to be signed, and expect to
3786 use it as signed data, then we need to explicitly sign extend the
3787 result until the bfd library is able to do this for us.
3791 static unsigned long
3792 target_to_host (from
, nbytes
, signextend
, objfile
)
3795 int signextend
; /* FIXME: Unused */
3796 struct objfile
*objfile
;
3798 unsigned long rtnval
;
3803 rtnval
= bfd_get_64 (objfile
-> obfd
, (bfd_byte
*) from
);
3806 rtnval
= bfd_get_32 (objfile
-> obfd
, (bfd_byte
*) from
);
3809 rtnval
= bfd_get_16 (objfile
-> obfd
, (bfd_byte
*) from
);
3812 rtnval
= bfd_get_8 (objfile
-> obfd
, (bfd_byte
*) from
);
3815 complain (&no_bfd_get_N
, DIE_ID
, DIE_NAME
, nbytes
);
3826 attribute_size -- compute size of data for a DWARF attribute
3830 static int attribute_size (unsigned int attr)
3834 Given a DWARF attribute in ATTR, compute the size of the first
3835 piece of data associated with this attribute and return that
3838 Returns -1 for unrecognized attributes.
3843 attribute_size (attr
)
3846 int nbytes
; /* Size of next data for this attribute */
3847 unsigned short form
; /* Form of the attribute */
3849 form
= FORM_FROM_ATTR (attr
);
3852 case FORM_STRING
: /* A variable length field is next */
3855 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3856 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3859 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3860 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3861 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3864 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3867 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3868 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3871 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);