1 /* DWARF debugging format support for GDB.
2 Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996
3 Free Software Foundation, Inc.
4 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
5 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 FIXME: Do we need to generate dependencies in partial symtabs?
26 (Perhaps we don't need to).
28 FIXME: Resolve minor differences between what information we put in the
29 partial symbol table and what dbxread puts in. For example, we don't yet
30 put enum constants there. And dbxread seems to invent a lot of typedefs
31 we never see. Use the new printpsym command to see the partial symbol table
34 FIXME: Figure out a better way to tell gdb about the name of the function
35 contain the user's entry point (I.E. main())
37 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
38 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"
55 #include "gdb_string.h"
61 /* Some macros to provide DIE info for complaints. */
63 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
64 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
66 /* Complaints that can be issued during DWARF debug info reading. */
68 struct complaint no_bfd_get_N
=
70 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object", 0, 0
73 struct complaint malformed_die
=
75 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%d bytes)", 0, 0
78 struct complaint bad_die_ref
=
80 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit", 0, 0
83 struct complaint unknown_attribute_form
=
85 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", 0, 0
88 struct complaint unknown_attribute_length
=
90 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes", 0, 0
93 struct complaint unexpected_fund_type
=
95 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x", 0, 0
98 struct complaint unknown_type_modifier
=
100 "DIE @ 0x%x \"%s\", unknown type modifier %u", 0, 0
103 struct complaint volatile_ignored
=
105 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored", 0, 0
108 struct complaint const_ignored
=
110 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", 0, 0
113 struct complaint botched_modified_type
=
115 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)", 0, 0
118 struct complaint op_deref2
=
120 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%x not handled", 0, 0
123 struct complaint op_deref4
=
125 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%x not handled", 0, 0
128 struct complaint basereg_not_handled
=
130 "DIE @ 0x%x \"%s\", BASEREG %d not handled", 0, 0
133 struct complaint dup_user_type_allocation
=
135 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation", 0, 0
138 struct complaint dup_user_type_definition
=
140 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition", 0, 0
143 struct complaint missing_tag
=
145 "DIE @ 0x%x \"%s\", missing class, structure, or union tag", 0, 0
148 struct complaint bad_array_element_type
=
150 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", 0, 0
153 struct complaint subscript_data_items
=
155 "DIE @ 0x%x \"%s\", can't decode subscript data items", 0, 0
158 struct complaint unhandled_array_subscript_format
=
160 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet", 0, 0
163 struct complaint unknown_array_subscript_format
=
165 "DIE @ 0x%x \"%s\", unknown array subscript format %x", 0, 0
168 struct complaint not_row_major
=
170 "DIE @ 0x%x \"%s\", array not row major; not handled correctly", 0, 0
173 struct complaint missing_at_name
=
175 "DIE @ 0x%x, AT_name tag missing", 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 /* Provide a default mapping from a DWARF register number to a gdb REGNUM. */
197 #ifndef DWARF_REG_TO_REGNUM
198 #define DWARF_REG_TO_REGNUM(num) (num)
201 /* Flags to target_to_host() that tell whether or not the data object is
202 expected to be signed. Used, for example, when fetching a signed
203 integer in the target environment which is used as a signed integer
204 in the host environment, and the two environments have different sized
205 ints. In this case, *somebody* has to sign extend the smaller sized
208 #define GET_UNSIGNED 0 /* No sign extension required */
209 #define GET_SIGNED 1 /* Sign extension required */
211 /* Defines for things which are specified in the document "DWARF Debugging
212 Information Format" published by UNIX International, Programming Languages
213 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
215 #define SIZEOF_DIE_LENGTH 4
216 #define SIZEOF_DIE_TAG 2
217 #define SIZEOF_ATTRIBUTE 2
218 #define SIZEOF_FORMAT_SPECIFIER 1
219 #define SIZEOF_FMT_FT 2
220 #define SIZEOF_LINETBL_LENGTH 4
221 #define SIZEOF_LINETBL_LINENO 4
222 #define SIZEOF_LINETBL_STMT 2
223 #define SIZEOF_LINETBL_DELTA 4
224 #define SIZEOF_LOC_ATOM_CODE 1
226 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
228 /* Macros that return the sizes of various types of data in the target
231 FIXME: Currently these are just compile time constants (as they are in
232 other parts of gdb as well). They need to be able to get the right size
233 either from the bfd or possibly from the DWARF info. It would be nice if
234 the DWARF producer inserted DIES that describe the fundamental types in
235 the target environment into the DWARF info, similar to the way dbx stabs
236 producers produce information about their fundamental types. */
238 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
239 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
241 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
242 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
243 However, the Issue 2 DWARF specification from AT&T defines it as
244 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
245 For backwards compatibility with the AT&T compiler produced executables
246 we define AT_short_element_list for this variant. */
248 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
250 /* External variables referenced. */
252 extern int info_verbose
; /* From main.c; nonzero => verbose */
253 extern char *warning_pre_print
; /* From utils.c */
255 /* The DWARF debugging information consists of two major pieces,
256 one is a block of DWARF Information Entries (DIE's) and the other
257 is a line number table. The "struct dieinfo" structure contains
258 the information for a single DIE, the one currently being processed.
260 In order to make it easier to randomly access the attribute fields
261 of the current DIE, which are specifically unordered within the DIE,
262 each DIE is scanned and an instance of the "struct dieinfo"
263 structure is initialized.
265 Initialization is done in two levels. The first, done by basicdieinfo(),
266 just initializes those fields that are vital to deciding whether or not
267 to use this DIE, how to skip past it, etc. The second, done by the
268 function completedieinfo(), fills in the rest of the information.
270 Attributes which have block forms are not interpreted at the time
271 the DIE is scanned, instead we just save pointers to the start
272 of their value fields.
274 Some fields have a flag <name>_p that is set when the value of the
275 field is valid (I.E. we found a matching attribute in the DIE). Since
276 we may want to test for the presence of some attributes in the DIE,
277 such as AT_low_pc, without restricting the values of the field,
278 we need someway to note that we found such an attribute.
285 char * die
; /* Pointer to the raw DIE data */
286 unsigned long die_length
; /* Length of the raw DIE data */
287 DIE_REF die_ref
; /* Offset of this DIE */
288 unsigned short die_tag
; /* Tag for this DIE */
289 unsigned long at_padding
;
290 unsigned long at_sibling
;
293 unsigned short at_fund_type
;
294 BLOCK
* at_mod_fund_type
;
295 unsigned long at_user_def_type
;
296 BLOCK
* at_mod_u_d_type
;
297 unsigned short at_ordering
;
298 BLOCK
* at_subscr_data
;
299 unsigned long at_byte_size
;
300 unsigned short at_bit_offset
;
301 unsigned long at_bit_size
;
302 BLOCK
* at_element_list
;
303 unsigned long at_stmt_list
;
305 CORE_ADDR at_high_pc
;
306 unsigned long at_language
;
307 unsigned long at_member
;
308 unsigned long at_discr
;
309 BLOCK
* at_discr_value
;
310 BLOCK
* at_string_length
;
313 unsigned long at_start_scope
;
314 unsigned long at_stride_size
;
315 unsigned long at_src_info
;
316 char * at_prototyped
;
317 unsigned int has_at_low_pc
:1;
318 unsigned int has_at_stmt_list
:1;
319 unsigned int has_at_byte_size
:1;
320 unsigned int short_element_list
:1;
323 static int diecount
; /* Approximate count of dies for compilation unit */
324 static struct dieinfo
*curdie
; /* For warnings and such */
326 static char *dbbase
; /* Base pointer to dwarf info */
327 static int dbsize
; /* Size of dwarf info in bytes */
328 static int dbroff
; /* Relative offset from start of .debug section */
329 static char *lnbase
; /* Base pointer to line section */
330 static int isreg
; /* Kludge to identify register variables */
331 static int optimized_out
; /* Kludge to identify optimized out variables */
332 /* Kludge to identify basereg references. Nonzero if we have an offset
333 relative to a basereg. */
335 /* Which base register is it relative to? */
338 /* This value is added to each symbol value. FIXME: Generalize to
339 the section_offsets structure used by dbxread (once this is done,
340 pass the appropriate section number to end_symtab). */
341 static CORE_ADDR baseaddr
; /* Add to each symbol value */
343 /* The section offsets used in the current psymtab or symtab. FIXME,
344 only used to pass one value (baseaddr) at the moment. */
345 static struct section_offsets
*base_section_offsets
;
347 /* We put a pointer to this structure in the read_symtab_private field
351 /* Always the absolute file offset to the start of the ".debug"
352 section for the file containing the DIE's being accessed. */
354 /* Relative offset from the start of the ".debug" section to the
355 first DIE to be accessed. When building the partial symbol
356 table, this value will be zero since we are accessing the
357 entire ".debug" section. When expanding a partial symbol
358 table entry, this value will be the offset to the first
359 DIE for the compilation unit containing the symbol that
360 triggers the expansion. */
362 /* The size of the chunk of DIE's being examined, in bytes. */
364 /* The absolute file offset to the line table fragment. Ignored
365 when building partial symbol tables, but used when expanding
366 them, and contains the absolute file offset to the fragment
367 of the ".line" section containing the line numbers for the
368 current compilation unit. */
372 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
373 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
374 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
375 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
377 /* The generic symbol table building routines have separate lists for
378 file scope symbols and all all other scopes (local scopes). So
379 we need to select the right one to pass to add_symbol_to_list().
380 We do it by keeping a pointer to the correct list in list_in_scope.
382 FIXME: The original dwarf code just treated the file scope as the first
383 local scope, and all other local scopes as nested local scopes, and worked
384 fine. Check to see if we really need to distinguish these in buildsym.c */
386 struct pending
**list_in_scope
= &file_symbols
;
388 /* DIES which have user defined types or modified user defined types refer to
389 other DIES for the type information. Thus we need to associate the offset
390 of a DIE for a user defined type with a pointer to the type information.
392 Originally this was done using a simple but expensive algorithm, with an
393 array of unsorted structures, each containing an offset/type-pointer pair.
394 This array was scanned linearly each time a lookup was done. The result
395 was that gdb was spending over half it's startup time munging through this
396 array of pointers looking for a structure that had the right offset member.
398 The second attempt used the same array of structures, but the array was
399 sorted using qsort each time a new offset/type was recorded, and a binary
400 search was used to find the type pointer for a given DIE offset. This was
401 even slower, due to the overhead of sorting the array each time a new
402 offset/type pair was entered.
404 The third attempt uses a fixed size array of type pointers, indexed by a
405 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
406 we can divide any DIE offset by 4 to obtain a unique index into this fixed
407 size array. Since each element is a 4 byte pointer, it takes exactly as
408 much memory to hold this array as to hold the DWARF info for a given
409 compilation unit. But it gets freed as soon as we are done with it.
410 This has worked well in practice, as a reasonable tradeoff between memory
411 consumption and speed, without having to resort to much more complicated
414 static struct type
**utypes
; /* Pointer to array of user type pointers */
415 static int numutypes
; /* Max number of user type pointers */
417 /* Maintain an array of referenced fundamental types for the current
418 compilation unit being read. For DWARF version 1, we have to construct
419 the fundamental types on the fly, since no information about the
420 fundamental types is supplied. Each such fundamental type is created by
421 calling a language dependent routine to create the type, and then a
422 pointer to that type is then placed in the array at the index specified
423 by it's FT_<TYPENAME> value. The array has a fixed size set by the
424 FT_NUM_MEMBERS compile time constant, which is the number of predefined
425 fundamental types gdb knows how to construct. */
427 static struct type
*ftypes
[FT_NUM_MEMBERS
]; /* Fundamental types */
429 /* Record the language for the compilation unit which is currently being
430 processed. We know it once we have seen the TAG_compile_unit DIE,
431 and we need it while processing the DIE's for that compilation unit.
432 It is eventually saved in the symtab structure, but we don't finalize
433 the symtab struct until we have processed all the DIE's for the
434 compilation unit. We also need to get and save a pointer to the
435 language struct for this language, so we can call the language
436 dependent routines for doing things such as creating fundamental
439 static enum language cu_language
;
440 static const struct language_defn
*cu_language_defn
;
442 /* Forward declarations of static functions so we don't have to worry
443 about ordering within this file. */
446 free_utypes
PARAMS ((PTR
));
449 attribute_size
PARAMS ((unsigned int));
452 target_to_host
PARAMS ((char *, int, int, struct objfile
*));
455 add_enum_psymbol
PARAMS ((struct dieinfo
*, struct objfile
*));
458 handle_producer
PARAMS ((char *));
461 read_file_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
464 read_func_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
467 read_lexical_block_scope
PARAMS ((struct dieinfo
*, char *, char *,
471 scan_partial_symbols
PARAMS ((char *, char *, struct objfile
*));
474 scan_compilation_units
PARAMS ((char *, char *, file_ptr
,
475 file_ptr
, struct objfile
*));
478 add_partial_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
481 basicdieinfo
PARAMS ((struct dieinfo
*, char *, struct objfile
*));
484 completedieinfo
PARAMS ((struct dieinfo
*, struct objfile
*));
487 dwarf_psymtab_to_symtab
PARAMS ((struct partial_symtab
*));
490 psymtab_to_symtab_1
PARAMS ((struct partial_symtab
*));
493 read_ofile_symtab
PARAMS ((struct partial_symtab
*));
496 process_dies
PARAMS ((char *, char *, struct objfile
*));
499 read_structure_scope
PARAMS ((struct dieinfo
*, char *, char *,
503 decode_array_element_type
PARAMS ((char *));
506 decode_subscript_data_item
PARAMS ((char *, char *));
509 dwarf_read_array_type
PARAMS ((struct dieinfo
*));
512 read_tag_pointer_type
PARAMS ((struct dieinfo
*dip
));
515 read_tag_string_type
PARAMS ((struct dieinfo
*dip
));
518 read_subroutine_type
PARAMS ((struct dieinfo
*, char *, char *));
521 read_enumeration
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
524 struct_type
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
527 enum_type
PARAMS ((struct dieinfo
*, struct objfile
*));
530 decode_line_numbers
PARAMS ((char *));
533 decode_die_type
PARAMS ((struct dieinfo
*));
536 decode_mod_fund_type
PARAMS ((char *));
539 decode_mod_u_d_type
PARAMS ((char *));
542 decode_modified_type
PARAMS ((char *, unsigned int, int));
545 decode_fund_type
PARAMS ((unsigned int));
548 create_name
PARAMS ((char *, struct obstack
*));
551 lookup_utype
PARAMS ((DIE_REF
));
554 alloc_utype
PARAMS ((DIE_REF
, struct type
*));
556 static struct symbol
*
557 new_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
560 synthesize_typedef
PARAMS ((struct dieinfo
*, struct objfile
*,
564 locval
PARAMS ((char *));
567 set_cu_language
PARAMS ((struct dieinfo
*));
570 dwarf_fundamental_type
PARAMS ((struct objfile
*, int));
577 dwarf_fundamental_type -- lookup or create a fundamental type
582 dwarf_fundamental_type (struct objfile *objfile, int typeid)
586 DWARF version 1 doesn't supply any fundamental type information,
587 so gdb has to construct such types. It has a fixed number of
588 fundamental types that it knows how to construct, which is the
589 union of all types that it knows how to construct for all languages
590 that it knows about. These are enumerated in gdbtypes.h.
592 As an example, assume we find a DIE that references a DWARF
593 fundamental type of FT_integer. We first look in the ftypes
594 array to see if we already have such a type, indexed by the
595 gdb internal value of FT_INTEGER. If so, we simply return a
596 pointer to that type. If not, then we ask an appropriate
597 language dependent routine to create a type FT_INTEGER, using
598 defaults reasonable for the current target machine, and install
599 that type in ftypes for future reference.
603 Pointer to a fundamental type.
608 dwarf_fundamental_type (objfile
, typeid)
609 struct objfile
*objfile
;
612 if (typeid < 0 || typeid >= FT_NUM_MEMBERS
)
614 error ("internal error - invalid fundamental type id %d", typeid);
617 /* Look for this particular type in the fundamental type vector. If one is
618 not found, create and install one appropriate for the current language
619 and the current target machine. */
621 if (ftypes
[typeid] == NULL
)
623 ftypes
[typeid] = cu_language_defn
-> la_fund_type(objfile
, typeid);
626 return (ftypes
[typeid]);
633 set_cu_language -- set local copy of language for compilation unit
638 set_cu_language (struct dieinfo *dip)
642 Decode the language attribute for a compilation unit DIE and
643 remember what the language was. We use this at various times
644 when processing DIE's for a given compilation unit.
653 set_cu_language (dip
)
656 switch (dip
-> at_language
)
660 cu_language
= language_c
;
662 case LANG_C_PLUS_PLUS
:
663 cu_language
= language_cplus
;
666 cu_language
= language_chill
;
669 cu_language
= language_m2
;
677 /* We don't know anything special about these yet. */
678 cu_language
= language_unknown
;
681 /* If no at_language, try to deduce one from the filename */
682 cu_language
= deduce_language_from_filename (dip
-> at_name
);
685 cu_language_defn
= language_def (cu_language
);
692 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
696 void dwarf_build_psymtabs (struct objfile *objfile,
697 struct section_offsets *section_offsets,
698 int mainline, file_ptr dbfoff, unsigned int dbfsize,
699 file_ptr lnoffset, unsigned int lnsize)
703 This function is called upon to build partial symtabs from files
704 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
706 It is passed a bfd* containing the DIES
707 and line number information, the corresponding filename for that
708 file, a base address for relocating the symbols, a flag indicating
709 whether or not this debugging information is from a "main symbol
710 table" rather than a shared library or dynamically linked file,
711 and file offset/size pairs for the DIE information and line number
721 dwarf_build_psymtabs (objfile
, section_offsets
, mainline
, dbfoff
, dbfsize
,
723 struct objfile
*objfile
;
724 struct section_offsets
*section_offsets
;
727 unsigned int dbfsize
;
731 bfd
*abfd
= objfile
->obfd
;
732 struct cleanup
*back_to
;
734 current_objfile
= objfile
;
736 dbbase
= xmalloc (dbsize
);
738 if ((bfd_seek (abfd
, dbfoff
, SEEK_SET
) != 0) ||
739 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
742 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
744 back_to
= make_cleanup (free
, dbbase
);
746 /* If we are reinitializing, or if we have never loaded syms yet, init.
747 Since we have no idea how many DIES we are looking at, we just guess
748 some arbitrary value. */
750 if (mainline
|| objfile
-> global_psymbols
.size
== 0 ||
751 objfile
-> static_psymbols
.size
== 0)
753 init_psymbol_list (objfile
, 1024);
756 /* Save the relocation factor where everybody can see it. */
758 base_section_offsets
= section_offsets
;
759 baseaddr
= ANOFFSET (section_offsets
, 0);
761 /* Follow the compilation unit sibling chain, building a partial symbol
762 table entry for each one. Save enough information about each compilation
763 unit to locate the full DWARF information later. */
765 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
767 do_cleanups (back_to
);
768 current_objfile
= NULL
;
775 read_lexical_block_scope -- process all dies in a lexical block
779 static void read_lexical_block_scope (struct dieinfo *dip,
780 char *thisdie, char *enddie)
784 Process all the DIES contained within a lexical block scope.
785 Start a new scope, process the dies, and then close the scope.
790 read_lexical_block_scope (dip
, thisdie
, enddie
, objfile
)
794 struct objfile
*objfile
;
796 register struct context_stack
*new;
798 push_context (0, dip
-> at_low_pc
);
799 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
800 new = pop_context ();
801 if (local_symbols
!= NULL
)
803 finish_block (0, &local_symbols
, new -> old_blocks
, new -> start_addr
,
804 dip
-> at_high_pc
, objfile
);
806 local_symbols
= new -> locals
;
813 lookup_utype -- look up a user defined type from die reference
817 static type *lookup_utype (DIE_REF die_ref)
821 Given a DIE reference, lookup the user defined type associated with
822 that DIE, if it has been registered already. If not registered, then
823 return NULL. Alloc_utype() can be called to register an empty
824 type for this reference, which will be filled in later when the
825 actual referenced DIE is processed.
829 lookup_utype (die_ref
)
832 struct type
*type
= NULL
;
835 utypeidx
= (die_ref
- dbroff
) / 4;
836 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
838 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
842 type
= *(utypes
+ utypeidx
);
852 alloc_utype -- add a user defined type for die reference
856 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
860 Given a die reference DIE_REF, and a possible pointer to a user
861 defined type UTYPEP, register that this reference has a user
862 defined type and either use the specified type in UTYPEP or
863 make a new empty type that will be filled in later.
865 We should only be called after calling lookup_utype() to verify that
866 there is not currently a type registered for DIE_REF.
870 alloc_utype (die_ref
, utypep
)
877 utypeidx
= (die_ref
- dbroff
) / 4;
878 typep
= utypes
+ utypeidx
;
879 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
881 utypep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
882 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
884 else if (*typep
!= NULL
)
887 complain (&dup_user_type_allocation
, DIE_ID
, DIE_NAME
);
893 utypep
= alloc_type (current_objfile
);
904 free_utypes -- free the utypes array and reset pointer & count
908 static void free_utypes (PTR dummy)
912 Called via do_cleanups to free the utypes array, reset the pointer to NULL,
913 and set numutypes back to zero. This ensures that the utypes does not get
914 referenced after being freed.
931 decode_die_type -- return a type for a specified die
935 static struct type *decode_die_type (struct dieinfo *dip)
939 Given a pointer to a die information structure DIP, decode the
940 type of the die and return a pointer to the decoded type. All
941 dies without specific types default to type int.
945 decode_die_type (dip
)
948 struct type
*type
= NULL
;
950 if (dip
-> at_fund_type
!= 0)
952 type
= decode_fund_type (dip
-> at_fund_type
);
954 else if (dip
-> at_mod_fund_type
!= NULL
)
956 type
= decode_mod_fund_type (dip
-> at_mod_fund_type
);
958 else if (dip
-> at_user_def_type
)
960 if ((type
= lookup_utype (dip
-> at_user_def_type
)) == NULL
)
962 type
= alloc_utype (dip
-> at_user_def_type
, NULL
);
965 else if (dip
-> at_mod_u_d_type
)
967 type
= decode_mod_u_d_type (dip
-> at_mod_u_d_type
);
971 type
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
980 struct_type -- compute and return the type for a struct or union
984 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
985 char *enddie, struct objfile *objfile)
989 Given pointer to a die information structure for a die which
990 defines a union or structure (and MUST define one or the other),
991 and pointers to the raw die data that define the range of dies which
992 define the members, compute and return the user defined type for the
997 struct_type (dip
, thisdie
, enddie
, objfile
)
1001 struct objfile
*objfile
;
1005 struct nextfield
*next
;
1008 struct nextfield
*list
= NULL
;
1009 struct nextfield
*new;
1016 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1018 /* No forward references created an empty type, so install one now */
1019 type
= alloc_utype (dip
-> die_ref
, NULL
);
1021 INIT_CPLUS_SPECIFIC(type
);
1022 switch (dip
-> die_tag
)
1024 case TAG_class_type
:
1025 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
1027 case TAG_structure_type
:
1028 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
1030 case TAG_union_type
:
1031 TYPE_CODE (type
) = TYPE_CODE_UNION
;
1034 /* Should never happen */
1035 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
1036 complain (&missing_tag
, DIE_ID
, DIE_NAME
);
1039 /* Some compilers try to be helpful by inventing "fake" names for
1040 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1041 Thanks, but no thanks... */
1042 if (dip
-> at_name
!= NULL
1043 && *dip
-> at_name
!= '~'
1044 && *dip
-> at_name
!= '.')
1046 TYPE_TAG_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1047 "", "", dip
-> at_name
);
1049 /* Use whatever size is known. Zero is a valid size. We might however
1050 wish to check has_at_byte_size to make sure that some byte size was
1051 given explicitly, but DWARF doesn't specify that explicit sizes of
1052 zero have to present, so complaining about missing sizes should
1053 probably not be the default. */
1054 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1055 thisdie
+= dip
-> die_length
;
1056 while (thisdie
< enddie
)
1058 basicdieinfo (&mbr
, thisdie
, objfile
);
1059 completedieinfo (&mbr
, objfile
);
1060 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
1064 else if (mbr
.at_sibling
!= 0)
1066 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
1070 nextdie
= thisdie
+ mbr
.die_length
;
1072 switch (mbr
.die_tag
)
1075 /* Get space to record the next field's data. */
1076 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1079 /* Save the data. */
1080 list
-> field
.name
=
1081 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
1082 &objfile
-> type_obstack
);
1083 list
-> field
.type
= decode_die_type (&mbr
);
1084 list
-> field
.bitpos
= 8 * locval (mbr
.at_location
);
1085 /* Handle bit fields. */
1086 list
-> field
.bitsize
= mbr
.at_bit_size
;
1087 if (BITS_BIG_ENDIAN
)
1089 /* For big endian bits, the at_bit_offset gives the
1090 additional bit offset from the MSB of the containing
1091 anonymous object to the MSB of the field. We don't
1092 have to do anything special since we don't need to
1093 know the size of the anonymous object. */
1094 list
-> field
.bitpos
+= mbr
.at_bit_offset
;
1098 /* For little endian bits, we need to have a non-zero
1099 at_bit_size, so that we know we are in fact dealing
1100 with a bitfield. Compute the bit offset to the MSB
1101 of the anonymous object, subtract off the number of
1102 bits from the MSB of the field to the MSB of the
1103 object, and then subtract off the number of bits of
1104 the field itself. The result is the bit offset of
1105 the LSB of the field. */
1106 if (mbr
.at_bit_size
> 0)
1108 if (mbr
.has_at_byte_size
)
1110 /* The size of the anonymous object containing
1111 the bit field is explicit, so use the
1112 indicated size (in bytes). */
1113 anonymous_size
= mbr
.at_byte_size
;
1117 /* The size of the anonymous object containing
1118 the bit field matches the size of an object
1119 of the bit field's type. DWARF allows
1120 at_byte_size to be left out in such cases, as
1121 a debug information size optimization. */
1122 anonymous_size
= TYPE_LENGTH (list
-> field
.type
);
1124 list
-> field
.bitpos
+=
1125 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
1131 process_dies (thisdie
, nextdie
, objfile
);
1136 /* Now create the vector of fields, and record how big it is. We may
1137 not even have any fields, if this DIE was generated due to a reference
1138 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1139 set, which clues gdb in to the fact that it needs to search elsewhere
1140 for the full structure definition. */
1143 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1147 TYPE_NFIELDS (type
) = nfields
;
1148 TYPE_FIELDS (type
) = (struct field
*)
1149 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1150 /* Copy the saved-up fields into the field vector. */
1151 for (n
= nfields
; list
; list
= list
-> next
)
1153 TYPE_FIELD (type
, --n
) = list
-> field
;
1163 read_structure_scope -- process all dies within struct or union
1167 static void read_structure_scope (struct dieinfo *dip,
1168 char *thisdie, char *enddie, struct objfile *objfile)
1172 Called when we find the DIE that starts a structure or union
1173 scope (definition) to process all dies that define the members
1174 of the structure or union. DIP is a pointer to the die info
1175 struct for the DIE that names the structure or union.
1179 Note that we need to call struct_type regardless of whether or not
1180 the DIE has an at_name attribute, since it might be an anonymous
1181 structure or union. This gets the type entered into our set of
1184 However, if the structure is incomplete (an opaque struct/union)
1185 then suppress creating a symbol table entry for it since gdb only
1186 wants to find the one with the complete definition. Note that if
1187 it is complete, we just call new_symbol, which does it's own
1188 checking about whether the struct/union is anonymous or not (and
1189 suppresses creating a symbol table entry itself).
1194 read_structure_scope (dip
, thisdie
, enddie
, objfile
)
1195 struct dieinfo
*dip
;
1198 struct objfile
*objfile
;
1203 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1204 if (!(TYPE_FLAGS (type
) & TYPE_FLAG_STUB
))
1206 sym
= new_symbol (dip
, objfile
);
1209 SYMBOL_TYPE (sym
) = type
;
1210 if (cu_language
== language_cplus
)
1212 synthesize_typedef (dip
, objfile
, type
);
1222 decode_array_element_type -- decode type of the array elements
1226 static struct type *decode_array_element_type (char *scan, char *end)
1230 As the last step in decoding the array subscript information for an
1231 array DIE, we need to decode the type of the array elements. We are
1232 passed a pointer to this last part of the subscript information and
1233 must return the appropriate type. If the type attribute is not
1234 recognized, just warn about the problem and return type int.
1237 static struct type
*
1238 decode_array_element_type (scan
)
1243 unsigned short attribute
;
1244 unsigned short fundtype
;
1247 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1249 scan
+= SIZEOF_ATTRIBUTE
;
1250 if ((nbytes
= attribute_size (attribute
)) == -1)
1252 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1253 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1260 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1262 typep
= decode_fund_type (fundtype
);
1264 case AT_mod_fund_type
:
1265 typep
= decode_mod_fund_type (scan
);
1267 case AT_user_def_type
:
1268 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1270 if ((typep
= lookup_utype (die_ref
)) == NULL
)
1272 typep
= alloc_utype (die_ref
, NULL
);
1275 case AT_mod_u_d_type
:
1276 typep
= decode_mod_u_d_type (scan
);
1279 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1280 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1291 decode_subscript_data_item -- decode array subscript item
1295 static struct type *
1296 decode_subscript_data_item (char *scan, char *end)
1300 The array subscripts and the data type of the elements of an
1301 array are described by a list of data items, stored as a block
1302 of contiguous bytes. There is a data item describing each array
1303 dimension, and a final data item describing the element type.
1304 The data items are ordered the same as their appearance in the
1305 source (I.E. leftmost dimension first, next to leftmost second,
1308 The data items describing each array dimension consist of four
1309 parts: (1) a format specifier, (2) type type of the subscript
1310 index, (3) a description of the low bound of the array dimension,
1311 and (4) a description of the high bound of the array dimension.
1313 The last data item is the description of the type of each of
1316 We are passed a pointer to the start of the block of bytes
1317 containing the remaining data items, and a pointer to the first
1318 byte past the data. This function recursively decodes the
1319 remaining data items and returns a type.
1321 If we somehow fail to decode some data, we complain about it
1322 and return a type "array of int".
1325 FIXME: This code only implements the forms currently used
1326 by the AT&T and GNU C compilers.
1328 The end pointer is supplied for error checking, maybe we should
1332 static struct type
*
1333 decode_subscript_data_item (scan
, end
)
1337 struct type
*typep
= NULL
; /* Array type we are building */
1338 struct type
*nexttype
; /* Type of each element (may be array) */
1339 struct type
*indextype
; /* Type of this index */
1340 struct type
*rangetype
;
1341 unsigned int format
;
1342 unsigned short fundtype
;
1343 unsigned long lowbound
;
1344 unsigned long highbound
;
1347 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1349 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1353 typep
= decode_array_element_type (scan
);
1356 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1358 indextype
= decode_fund_type (fundtype
);
1359 scan
+= SIZEOF_FMT_FT
;
1360 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1361 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1363 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1365 nexttype
= decode_subscript_data_item (scan
, end
);
1366 if (nexttype
== NULL
)
1368 /* Munged subscript data or other problem, fake it. */
1369 complain (&subscript_data_items
, DIE_ID
, DIE_NAME
);
1370 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1372 rangetype
= create_range_type ((struct type
*) NULL
, indextype
,
1373 lowbound
, highbound
);
1374 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1383 complain (&unhandled_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1384 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1385 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1386 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1389 complain (&unknown_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1390 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1391 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1392 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1402 dwarf_read_array_type -- read TAG_array_type DIE
1406 static void dwarf_read_array_type (struct dieinfo *dip)
1410 Extract all information from a TAG_array_type DIE and add to
1411 the user defined type vector.
1415 dwarf_read_array_type (dip
)
1416 struct dieinfo
*dip
;
1422 unsigned short blocksz
;
1425 if (dip
-> at_ordering
!= ORD_row_major
)
1427 /* FIXME: Can gdb even handle column major arrays? */
1428 complain (¬_row_major
, DIE_ID
, DIE_NAME
);
1430 if ((sub
= dip
-> at_subscr_data
) != NULL
)
1432 nbytes
= attribute_size (AT_subscr_data
);
1433 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1434 subend
= sub
+ nbytes
+ blocksz
;
1436 type
= decode_subscript_data_item (sub
, subend
);
1437 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1439 /* Install user defined type that has not been referenced yet. */
1440 alloc_utype (dip
-> die_ref
, type
);
1442 else if (TYPE_CODE (utype
) == TYPE_CODE_UNDEF
)
1444 /* Ick! A forward ref has already generated a blank type in our
1445 slot, and this type probably already has things pointing to it
1446 (which is what caused it to be created in the first place).
1447 If it's just a place holder we can plop our fully defined type
1448 on top of it. We can't recover the space allocated for our
1449 new type since it might be on an obstack, but we could reuse
1450 it if we kept a list of them, but it might not be worth it
1456 /* Double ick! Not only is a type already in our slot, but
1457 someone has decorated it. Complain and leave it alone. */
1458 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1467 read_tag_pointer_type -- read TAG_pointer_type DIE
1471 static void read_tag_pointer_type (struct dieinfo *dip)
1475 Extract all information from a TAG_pointer_type DIE and add to
1476 the user defined type vector.
1480 read_tag_pointer_type (dip
)
1481 struct dieinfo
*dip
;
1486 type
= decode_die_type (dip
);
1487 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1489 utype
= lookup_pointer_type (type
);
1490 alloc_utype (dip
-> die_ref
, utype
);
1494 TYPE_TARGET_TYPE (utype
) = type
;
1495 TYPE_POINTER_TYPE (type
) = utype
;
1497 /* We assume the machine has only one representation for pointers! */
1498 /* FIXME: This confuses host<->target data representations, and is a
1499 poor assumption besides. */
1501 TYPE_LENGTH (utype
) = sizeof (char *);
1502 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1510 read_tag_string_type -- read TAG_string_type DIE
1514 static void read_tag_string_type (struct dieinfo *dip)
1518 Extract all information from a TAG_string_type DIE and add to
1519 the user defined type vector. It isn't really a user defined
1520 type, but it behaves like one, with other DIE's using an
1521 AT_user_def_type attribute to reference it.
1525 read_tag_string_type (dip
)
1526 struct dieinfo
*dip
;
1529 struct type
*indextype
;
1530 struct type
*rangetype
;
1531 unsigned long lowbound
= 0;
1532 unsigned long highbound
;
1534 if (dip
-> has_at_byte_size
)
1536 /* A fixed bounds string */
1537 highbound
= dip
-> at_byte_size
- 1;
1541 /* A varying length string. Stub for now. (FIXME) */
1544 indextype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1545 rangetype
= create_range_type ((struct type
*) NULL
, indextype
, lowbound
,
1548 utype
= lookup_utype (dip
-> die_ref
);
1551 /* No type defined, go ahead and create a blank one to use. */
1552 utype
= alloc_utype (dip
-> die_ref
, (struct type
*) NULL
);
1556 /* Already a type in our slot due to a forward reference. Make sure it
1557 is a blank one. If not, complain and leave it alone. */
1558 if (TYPE_CODE (utype
) != TYPE_CODE_UNDEF
)
1560 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1565 /* Create the string type using the blank type we either found or created. */
1566 utype
= create_string_type (utype
, rangetype
);
1573 read_subroutine_type -- process TAG_subroutine_type dies
1577 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1582 Handle DIES due to C code like:
1585 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1591 The parameter DIES are currently ignored. See if gdb has a way to
1592 include this info in it's type system, and decode them if so. Is
1593 this what the type structure's "arg_types" field is for? (FIXME)
1597 read_subroutine_type (dip
, thisdie
, enddie
)
1598 struct dieinfo
*dip
;
1602 struct type
*type
; /* Type that this function returns */
1603 struct type
*ftype
; /* Function that returns above type */
1605 /* Decode the type that this subroutine returns */
1607 type
= decode_die_type (dip
);
1609 /* Check to see if we already have a partially constructed user
1610 defined type for this DIE, from a forward reference. */
1612 if ((ftype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1614 /* This is the first reference to one of these types. Make
1615 a new one and place it in the user defined types. */
1616 ftype
= lookup_function_type (type
);
1617 alloc_utype (dip
-> die_ref
, ftype
);
1619 else if (TYPE_CODE (ftype
) == TYPE_CODE_UNDEF
)
1621 /* We have an existing partially constructed type, so bash it
1622 into the correct type. */
1623 TYPE_TARGET_TYPE (ftype
) = type
;
1624 TYPE_LENGTH (ftype
) = 1;
1625 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1629 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1637 read_enumeration -- process dies which define an enumeration
1641 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1642 char *enddie, struct objfile *objfile)
1646 Given a pointer to a die which begins an enumeration, process all
1647 the dies that define the members of the enumeration.
1651 Note that we need to call enum_type regardless of whether or not we
1652 have a symbol, since we might have an enum without a tag name (thus
1653 no symbol for the tagname).
1657 read_enumeration (dip
, thisdie
, enddie
, objfile
)
1658 struct dieinfo
*dip
;
1661 struct objfile
*objfile
;
1666 type
= enum_type (dip
, objfile
);
1667 sym
= new_symbol (dip
, objfile
);
1670 SYMBOL_TYPE (sym
) = type
;
1671 if (cu_language
== language_cplus
)
1673 synthesize_typedef (dip
, objfile
, type
);
1682 enum_type -- decode and return a type for an enumeration
1686 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1690 Given a pointer to a die information structure for the die which
1691 starts an enumeration, process all the dies that define the members
1692 of the enumeration and return a type pointer for the enumeration.
1694 At the same time, for each member of the enumeration, create a
1695 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1696 and give it the type of the enumeration itself.
1700 Note that the DWARF specification explicitly mandates that enum
1701 constants occur in reverse order from the source program order,
1702 for "consistency" and because this ordering is easier for many
1703 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1704 Entries). Because gdb wants to see the enum members in program
1705 source order, we have to ensure that the order gets reversed while
1706 we are processing them.
1709 static struct type
*
1710 enum_type (dip
, objfile
)
1711 struct dieinfo
*dip
;
1712 struct objfile
*objfile
;
1716 struct nextfield
*next
;
1719 struct nextfield
*list
= NULL
;
1720 struct nextfield
*new;
1725 unsigned short blocksz
;
1728 int unsigned_enum
= 1;
1730 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1732 /* No forward references created an empty type, so install one now */
1733 type
= alloc_utype (dip
-> die_ref
, NULL
);
1735 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1736 /* Some compilers try to be helpful by inventing "fake" names for
1737 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1738 Thanks, but no thanks... */
1739 if (dip
-> at_name
!= NULL
1740 && *dip
-> at_name
!= '~'
1741 && *dip
-> at_name
!= '.')
1743 TYPE_TAG_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1744 "", "", dip
-> at_name
);
1746 if (dip
-> at_byte_size
!= 0)
1748 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1750 if ((scan
= dip
-> at_element_list
) != NULL
)
1752 if (dip
-> short_element_list
)
1754 nbytes
= attribute_size (AT_short_element_list
);
1758 nbytes
= attribute_size (AT_element_list
);
1760 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1761 listend
= scan
+ nbytes
+ blocksz
;
1763 while (scan
< listend
)
1765 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1768 list
-> field
.type
= NULL
;
1769 list
-> field
.bitsize
= 0;
1770 list
-> field
.bitpos
=
1771 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1773 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1774 list
-> field
.name
= obsavestring (scan
, strlen (scan
),
1775 &objfile
-> type_obstack
);
1776 scan
+= strlen (scan
) + 1;
1778 /* Handcraft a new symbol for this enum member. */
1779 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1780 sizeof (struct symbol
));
1781 memset (sym
, 0, sizeof (struct symbol
));
1782 SYMBOL_NAME (sym
) = create_name (list
-> field
.name
,
1783 &objfile
->symbol_obstack
);
1784 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
1785 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1786 SYMBOL_CLASS (sym
) = LOC_CONST
;
1787 SYMBOL_TYPE (sym
) = type
;
1788 SYMBOL_VALUE (sym
) = list
-> field
.bitpos
;
1789 if (SYMBOL_VALUE (sym
) < 0)
1791 add_symbol_to_list (sym
, list_in_scope
);
1793 /* Now create the vector of fields, and record how big it is. This is
1794 where we reverse the order, by pulling the members off the list in
1795 reverse order from how they were inserted. If we have no fields
1796 (this is apparently possible in C++) then skip building a field
1801 TYPE_FLAGS (type
) |= TYPE_FLAG_UNSIGNED
;
1802 TYPE_NFIELDS (type
) = nfields
;
1803 TYPE_FIELDS (type
) = (struct field
*)
1804 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1805 /* Copy the saved-up fields into the field vector. */
1806 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
-> next
)
1808 TYPE_FIELD (type
, n
++) = list
-> field
;
1819 read_func_scope -- process all dies within a function scope
1823 Process all dies within a given function scope. We are passed
1824 a die information structure pointer DIP for the die which
1825 starts the function scope, and pointers into the raw die data
1826 that define the dies within the function scope.
1828 For now, we ignore lexical block scopes within the function.
1829 The problem is that AT&T cc does not define a DWARF lexical
1830 block scope for the function itself, while gcc defines a
1831 lexical block scope for the function. We need to think about
1832 how to handle this difference, or if it is even a problem.
1837 read_func_scope (dip
, thisdie
, enddie
, objfile
)
1838 struct dieinfo
*dip
;
1841 struct objfile
*objfile
;
1843 register struct context_stack
*new;
1845 /* AT_name is absent if the function is described with an
1846 AT_abstract_origin tag.
1847 Ignore the function description for now to avoid GDB core dumps.
1848 FIXME: Add code to handle AT_abstract_origin tags properly. */
1849 if (dip
-> at_name
== NULL
)
1851 complain (&missing_at_name
, DIE_ID
);
1855 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1856 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1858 objfile
-> ei
.entry_func_lowpc
= dip
-> at_low_pc
;
1859 objfile
-> ei
.entry_func_highpc
= dip
-> at_high_pc
;
1861 if (STREQ (dip
-> at_name
, "main")) /* FIXME: hardwired name */
1863 objfile
-> ei
.main_func_lowpc
= dip
-> at_low_pc
;
1864 objfile
-> ei
.main_func_highpc
= dip
-> at_high_pc
;
1866 new = push_context (0, dip
-> at_low_pc
);
1867 new -> name
= new_symbol (dip
, objfile
);
1868 list_in_scope
= &local_symbols
;
1869 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1870 new = pop_context ();
1871 /* Make a block for the local symbols within. */
1872 finish_block (new -> name
, &local_symbols
, new -> old_blocks
,
1873 new -> start_addr
, dip
-> at_high_pc
, objfile
);
1874 list_in_scope
= &file_symbols
;
1882 handle_producer -- process the AT_producer attribute
1886 Perform any operations that depend on finding a particular
1887 AT_producer attribute.
1892 handle_producer (producer
)
1896 /* If this compilation unit was compiled with g++ or gcc, then set the
1897 processing_gcc_compilation flag. */
1899 processing_gcc_compilation
=
1900 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
))
1901 || STREQN (producer
, CHILL_PRODUCER
, strlen (CHILL_PRODUCER
))
1902 || STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
));
1904 /* Select a demangling style if we can identify the producer and if
1905 the current style is auto. We leave the current style alone if it
1906 is not auto. We also leave the demangling style alone if we find a
1907 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1909 if (AUTO_DEMANGLING
)
1911 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1913 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1915 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1917 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1927 read_file_scope -- process all dies within a file scope
1931 Process all dies within a given file scope. We are passed a
1932 pointer to the die information structure for the die which
1933 starts the file scope, and pointers into the raw die data which
1934 mark the range of dies within the file scope.
1936 When the partial symbol table is built, the file offset for the line
1937 number table for each compilation unit is saved in the partial symbol
1938 table entry for that compilation unit. As the symbols for each
1939 compilation unit are read, the line number table is read into memory
1940 and the variable lnbase is set to point to it. Thus all we have to
1941 do is use lnbase to access the line number table for the current
1946 read_file_scope (dip
, thisdie
, enddie
, objfile
)
1947 struct dieinfo
*dip
;
1950 struct objfile
*objfile
;
1952 struct cleanup
*back_to
;
1953 struct symtab
*symtab
;
1955 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1956 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1958 objfile
-> ei
.entry_file_lowpc
= dip
-> at_low_pc
;
1959 objfile
-> ei
.entry_file_highpc
= dip
-> at_high_pc
;
1961 set_cu_language (dip
);
1962 if (dip
-> at_producer
!= NULL
)
1964 handle_producer (dip
-> at_producer
);
1966 numutypes
= (enddie
- thisdie
) / 4;
1967 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1968 back_to
= make_cleanup (free_utypes
, NULL
);
1969 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1970 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1971 start_symtab (dip
-> at_name
, dip
-> at_comp_dir
, dip
-> at_low_pc
);
1972 decode_line_numbers (lnbase
);
1973 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1975 symtab
= end_symtab (dip
-> at_high_pc
, objfile
, 0);
1978 symtab
-> language
= cu_language
;
1980 do_cleanups (back_to
);
1987 process_dies -- process a range of DWARF Information Entries
1991 static void process_dies (char *thisdie, char *enddie,
1992 struct objfile *objfile)
1996 Process all DIE's in a specified range. May be (and almost
1997 certainly will be) called recursively.
2001 process_dies (thisdie
, enddie
, objfile
)
2004 struct objfile
*objfile
;
2009 while (thisdie
< enddie
)
2011 basicdieinfo (&di
, thisdie
, objfile
);
2012 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2016 else if (di
.die_tag
== TAG_padding
)
2018 nextdie
= thisdie
+ di
.die_length
;
2022 completedieinfo (&di
, objfile
);
2023 if (di
.at_sibling
!= 0)
2025 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2029 nextdie
= thisdie
+ di
.die_length
;
2031 #ifdef SMASH_TEXT_ADDRESS
2032 /* I think that these are always text, not data, addresses. */
2033 SMASH_TEXT_ADDRESS (di
.at_low_pc
);
2034 SMASH_TEXT_ADDRESS (di
.at_high_pc
);
2038 case TAG_compile_unit
:
2039 /* Skip Tag_compile_unit if we are already inside a compilation
2040 unit, we are unable to handle nested compilation units
2041 properly (FIXME). */
2042 if (current_subfile
== NULL
)
2043 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
2045 nextdie
= thisdie
+ di
.die_length
;
2047 case TAG_global_subroutine
:
2048 case TAG_subroutine
:
2049 if (di
.has_at_low_pc
)
2051 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
2054 case TAG_lexical_block
:
2055 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
2057 case TAG_class_type
:
2058 case TAG_structure_type
:
2059 case TAG_union_type
:
2060 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
2062 case TAG_enumeration_type
:
2063 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
2065 case TAG_subroutine_type
:
2066 read_subroutine_type (&di
, thisdie
, nextdie
);
2068 case TAG_array_type
:
2069 dwarf_read_array_type (&di
);
2071 case TAG_pointer_type
:
2072 read_tag_pointer_type (&di
);
2074 case TAG_string_type
:
2075 read_tag_string_type (&di
);
2078 new_symbol (&di
, objfile
);
2090 decode_line_numbers -- decode a line number table fragment
2094 static void decode_line_numbers (char *tblscan, char *tblend,
2095 long length, long base, long line, long pc)
2099 Translate the DWARF line number information to gdb form.
2101 The ".line" section contains one or more line number tables, one for
2102 each ".line" section from the objects that were linked.
2104 The AT_stmt_list attribute for each TAG_source_file entry in the
2105 ".debug" section contains the offset into the ".line" section for the
2106 start of the table for that file.
2108 The table itself has the following structure:
2110 <table length><base address><source statement entry>
2111 4 bytes 4 bytes 10 bytes
2113 The table length is the total size of the table, including the 4 bytes
2114 for the length information.
2116 The base address is the address of the first instruction generated
2117 for the source file.
2119 Each source statement entry has the following structure:
2121 <line number><statement position><address delta>
2122 4 bytes 2 bytes 4 bytes
2124 The line number is relative to the start of the file, starting with
2127 The statement position either -1 (0xFFFF) or the number of characters
2128 from the beginning of the line to the beginning of the statement.
2130 The address delta is the difference between the base address and
2131 the address of the first instruction for the statement.
2133 Note that we must copy the bytes from the packed table to our local
2134 variables before attempting to use them, to avoid alignment problems
2135 on some machines, particularly RISC processors.
2139 Does gdb expect the line numbers to be sorted? They are now by
2140 chance/luck, but are not required to be. (FIXME)
2142 The line with number 0 is unused, gdb apparently can discover the
2143 span of the last line some other way. How? (FIXME)
2147 decode_line_numbers (linetable
)
2152 unsigned long length
;
2157 if (linetable
!= NULL
)
2159 tblscan
= tblend
= linetable
;
2160 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2162 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2164 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2165 GET_UNSIGNED
, current_objfile
);
2166 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2168 while (tblscan
< tblend
)
2170 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2172 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2173 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2175 tblscan
+= SIZEOF_LINETBL_DELTA
;
2179 record_line (current_subfile
, line
, pc
);
2189 locval -- compute the value of a location attribute
2193 static int locval (char *loc)
2197 Given pointer to a string of bytes that define a location, compute
2198 the location and return the value.
2199 A location description containing no atoms indicates that the
2200 object is optimized out. The global optimized_out flag is set for
2201 those, the return value is meaningless.
2203 When computing values involving the current value of the frame pointer,
2204 the value zero is used, which results in a value relative to the frame
2205 pointer, rather than the absolute value. This is what GDB wants
2208 When the result is a register number, the global isreg flag is set,
2209 otherwise it is cleared. This is a kludge until we figure out a better
2210 way to handle the problem. Gdb's design does not mesh well with the
2211 DWARF notion of a location computing interpreter, which is a shame
2212 because the flexibility goes unused.
2216 Note that stack[0] is unused except as a default error return.
2217 Note that stack overflow is not yet handled.
2224 unsigned short nbytes
;
2225 unsigned short locsize
;
2226 auto long stack
[64];
2232 nbytes
= attribute_size (AT_location
);
2233 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2235 end
= loc
+ locsize
;
2241 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2245 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2247 loc
+= SIZEOF_LOC_ATOM_CODE
;
2248 switch (loc_atom_code
)
2255 /* push register (number) */
2257 = DWARF_REG_TO_REGNUM (target_to_host (loc
, loc_value_size
,
2260 loc
+= loc_value_size
;
2264 /* push value of register (number) */
2265 /* Actually, we compute the value as if register has 0, so the
2266 value ends up being the offset from that register. */
2268 basereg
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2270 loc
+= loc_value_size
;
2271 stack
[++stacki
] = 0;
2274 /* push address (relocated address) */
2275 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2276 GET_UNSIGNED
, current_objfile
);
2277 loc
+= loc_value_size
;
2280 /* push constant (number) FIXME: signed or unsigned! */
2281 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2282 GET_SIGNED
, current_objfile
);
2283 loc
+= loc_value_size
;
2286 /* pop, deref and push 2 bytes (as a long) */
2287 complain (&op_deref2
, DIE_ID
, DIE_NAME
, stack
[stacki
]);
2289 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2290 complain (&op_deref4
, DIE_ID
, DIE_NAME
, stack
[stacki
]);
2292 case OP_ADD
: /* pop top 2 items, add, push result */
2293 stack
[stacki
- 1] += stack
[stacki
];
2298 return (stack
[stacki
]);
2305 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2309 static void read_ofile_symtab (struct partial_symtab *pst)
2313 When expanding a partial symbol table entry to a full symbol table
2314 entry, this is the function that gets called to read in the symbols
2315 for the compilation unit. A pointer to the newly constructed symtab,
2316 which is now the new first one on the objfile's symtab list, is
2317 stashed in the partial symbol table entry.
2321 read_ofile_symtab (pst
)
2322 struct partial_symtab
*pst
;
2324 struct cleanup
*back_to
;
2325 unsigned long lnsize
;
2328 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2330 abfd
= pst
-> objfile
-> obfd
;
2331 current_objfile
= pst
-> objfile
;
2333 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2334 unit, seek to the location in the file, and read in all the DIE's. */
2337 dbsize
= DBLENGTH (pst
);
2338 dbbase
= xmalloc (dbsize
);
2339 dbroff
= DBROFF(pst
);
2340 foffset
= DBFOFF(pst
) + dbroff
;
2341 base_section_offsets
= pst
->section_offsets
;
2342 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2343 if (bfd_seek (abfd
, foffset
, SEEK_SET
) ||
2344 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
2347 error ("can't read DWARF data");
2349 back_to
= make_cleanup (free
, dbbase
);
2351 /* If there is a line number table associated with this compilation unit
2352 then read the size of this fragment in bytes, from the fragment itself.
2353 Allocate a buffer for the fragment and read it in for future
2359 if (bfd_seek (abfd
, LNFOFF (pst
), SEEK_SET
) ||
2360 (bfd_read ((PTR
) lnsizedata
, sizeof (lnsizedata
), 1, abfd
) !=
2361 sizeof (lnsizedata
)))
2363 error ("can't read DWARF line number table size");
2365 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2366 GET_UNSIGNED
, pst
-> objfile
);
2367 lnbase
= xmalloc (lnsize
);
2368 if (bfd_seek (abfd
, LNFOFF (pst
), SEEK_SET
) ||
2369 (bfd_read (lnbase
, lnsize
, 1, abfd
) != lnsize
))
2372 error ("can't read DWARF line numbers");
2374 make_cleanup (free
, lnbase
);
2377 process_dies (dbbase
, dbbase
+ dbsize
, pst
-> objfile
);
2378 do_cleanups (back_to
);
2379 current_objfile
= NULL
;
2380 pst
-> symtab
= pst
-> objfile
-> symtabs
;
2387 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2391 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2395 Called once for each partial symbol table entry that needs to be
2396 expanded into a full symbol table entry.
2401 psymtab_to_symtab_1 (pst
)
2402 struct partial_symtab
*pst
;
2405 struct cleanup
*old_chain
;
2411 warning ("psymtab for %s already read in. Shouldn't happen.",
2416 /* Read in all partial symtabs on which this one is dependent */
2417 for (i
= 0; i
< pst
-> number_of_dependencies
; i
++)
2419 if (!pst
-> dependencies
[i
] -> readin
)
2421 /* Inform about additional files that need to be read in. */
2424 fputs_filtered (" ", gdb_stdout
);
2426 fputs_filtered ("and ", gdb_stdout
);
2428 printf_filtered ("%s...",
2429 pst
-> dependencies
[i
] -> filename
);
2431 gdb_flush (gdb_stdout
); /* Flush output */
2433 psymtab_to_symtab_1 (pst
-> dependencies
[i
]);
2436 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2439 old_chain
= make_cleanup (really_free_pendings
, 0);
2440 read_ofile_symtab (pst
);
2443 printf_filtered ("%d DIE's, sorting...", diecount
);
2445 gdb_flush (gdb_stdout
);
2447 sort_symtab_syms (pst
-> symtab
);
2448 do_cleanups (old_chain
);
2459 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2463 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2467 This is the DWARF support entry point for building a full symbol
2468 table entry from a partial symbol table entry. We are passed a
2469 pointer to the partial symbol table entry that needs to be expanded.
2474 dwarf_psymtab_to_symtab (pst
)
2475 struct partial_symtab
*pst
;
2482 warning ("psymtab for %s already read in. Shouldn't happen.",
2487 if (DBLENGTH (pst
) || pst
-> number_of_dependencies
)
2489 /* Print the message now, before starting serious work, to avoid
2490 disconcerting pauses. */
2493 printf_filtered ("Reading in symbols for %s...",
2495 gdb_flush (gdb_stdout
);
2498 psymtab_to_symtab_1 (pst
);
2500 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2501 we need to do an equivalent or is this something peculiar to
2503 Match with global symbols. This only needs to be done once,
2504 after all of the symtabs and dependencies have been read in.
2506 scan_file_globals (pst
-> objfile
);
2509 /* Finish up the verbose info message. */
2512 printf_filtered ("done.\n");
2513 gdb_flush (gdb_stdout
);
2524 add_enum_psymbol -- add enumeration members to partial symbol table
2528 Given pointer to a DIE that is known to be for an enumeration,
2529 extract the symbolic names of the enumeration members and add
2530 partial symbols for them.
2534 add_enum_psymbol (dip
, objfile
)
2535 struct dieinfo
*dip
;
2536 struct objfile
*objfile
;
2540 unsigned short blocksz
;
2543 if ((scan
= dip
-> at_element_list
) != NULL
)
2545 if (dip
-> short_element_list
)
2547 nbytes
= attribute_size (AT_short_element_list
);
2551 nbytes
= attribute_size (AT_element_list
);
2553 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2555 listend
= scan
+ blocksz
;
2556 while (scan
< listend
)
2558 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2559 add_psymbol_to_list (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2560 &objfile
-> static_psymbols
, 0, 0, cu_language
,
2562 scan
+= strlen (scan
) + 1;
2571 add_partial_symbol -- add symbol to partial symbol table
2575 Given a DIE, if it is one of the types that we want to
2576 add to a partial symbol table, finish filling in the die info
2577 and then add a partial symbol table entry for it.
2581 The caller must ensure that the DIE has a valid name attribute.
2585 add_partial_symbol (dip
, objfile
)
2586 struct dieinfo
*dip
;
2587 struct objfile
*objfile
;
2589 switch (dip
-> die_tag
)
2591 case TAG_global_subroutine
:
2592 add_psymbol_to_list (dip
-> at_name
, strlen (dip
-> at_name
),
2593 VAR_NAMESPACE
, LOC_BLOCK
,
2594 &objfile
-> global_psymbols
,
2595 0, dip
-> at_low_pc
, cu_language
, objfile
);
2597 case TAG_global_variable
:
2598 add_psymbol_to_list (dip
-> at_name
, strlen (dip
-> at_name
),
2599 VAR_NAMESPACE
, LOC_STATIC
,
2600 &objfile
-> global_psymbols
,
2601 0, 0, cu_language
, objfile
);
2603 case TAG_subroutine
:
2604 add_psymbol_to_list (dip
-> at_name
, strlen (dip
-> at_name
),
2605 VAR_NAMESPACE
, LOC_BLOCK
,
2606 &objfile
-> static_psymbols
,
2607 0, dip
-> at_low_pc
, cu_language
, objfile
);
2609 case TAG_local_variable
:
2610 add_psymbol_to_list (dip
-> at_name
, strlen (dip
-> at_name
),
2611 VAR_NAMESPACE
, LOC_STATIC
,
2612 &objfile
-> static_psymbols
,
2613 0, 0, cu_language
, objfile
);
2616 add_psymbol_to_list (dip
-> at_name
, strlen (dip
-> at_name
),
2617 VAR_NAMESPACE
, LOC_TYPEDEF
,
2618 &objfile
-> static_psymbols
,
2619 0, 0, cu_language
, objfile
);
2621 case TAG_class_type
:
2622 case TAG_structure_type
:
2623 case TAG_union_type
:
2624 case TAG_enumeration_type
:
2625 /* Do not add opaque aggregate definitions to the psymtab. */
2626 if (!dip
-> has_at_byte_size
)
2628 add_psymbol_to_list (dip
-> at_name
, strlen (dip
-> at_name
),
2629 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2630 &objfile
-> static_psymbols
,
2631 0, 0, cu_language
, objfile
);
2632 if (cu_language
== language_cplus
)
2634 /* For C++, these implicitly act as typedefs as well. */
2635 add_psymbol_to_list (dip
-> at_name
, strlen (dip
-> at_name
),
2636 VAR_NAMESPACE
, LOC_TYPEDEF
,
2637 &objfile
-> static_psymbols
,
2638 0, 0, cu_language
, objfile
);
2648 scan_partial_symbols -- scan DIE's within a single compilation unit
2652 Process the DIE's within a single compilation unit, looking for
2653 interesting DIE's that contribute to the partial symbol table entry
2654 for this compilation unit.
2658 There are some DIE's that may appear both at file scope and within
2659 the scope of a function. We are only interested in the ones at file
2660 scope, and the only way to tell them apart is to keep track of the
2661 scope. For example, consider the test case:
2666 for which the relevant DWARF segment has the structure:
2669 0x23 global subrtn sibling 0x9b
2671 fund_type FT_integer
2676 0x23 local var sibling 0x97
2678 fund_type FT_integer
2679 location OP_BASEREG 0xe
2686 0x1d local var sibling 0xb8
2688 fund_type FT_integer
2689 location OP_ADDR 0x800025dc
2694 We want to include the symbol 'i' in the partial symbol table, but
2695 not the symbol 'j'. In essence, we want to skip all the dies within
2696 the scope of a TAG_global_subroutine DIE.
2698 Don't attempt to add anonymous structures or unions since they have
2699 no name. Anonymous enumerations however are processed, because we
2700 want to extract their member names (the check for a tag name is
2703 Also, for variables and subroutines, check that this is the place
2704 where the actual definition occurs, rather than just a reference
2709 scan_partial_symbols (thisdie
, enddie
, objfile
)
2712 struct objfile
*objfile
;
2718 while (thisdie
< enddie
)
2720 basicdieinfo (&di
, thisdie
, objfile
);
2721 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2727 nextdie
= thisdie
+ di
.die_length
;
2728 /* To avoid getting complete die information for every die, we
2729 only do it (below) for the cases we are interested in. */
2732 case TAG_global_subroutine
:
2733 case TAG_subroutine
:
2734 completedieinfo (&di
, objfile
);
2735 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2737 add_partial_symbol (&di
, objfile
);
2738 /* If there is a sibling attribute, adjust the nextdie
2739 pointer to skip the entire scope of the subroutine.
2740 Apply some sanity checking to make sure we don't
2741 overrun or underrun the range of remaining DIE's */
2742 if (di
.at_sibling
!= 0)
2744 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2745 if ((temp
< thisdie
) || (temp
>= enddie
))
2747 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
,
2757 case TAG_global_variable
:
2758 case TAG_local_variable
:
2759 completedieinfo (&di
, objfile
);
2760 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2762 add_partial_symbol (&di
, objfile
);
2766 case TAG_class_type
:
2767 case TAG_structure_type
:
2768 case TAG_union_type
:
2769 completedieinfo (&di
, objfile
);
2772 add_partial_symbol (&di
, objfile
);
2775 case TAG_enumeration_type
:
2776 completedieinfo (&di
, objfile
);
2779 add_partial_symbol (&di
, objfile
);
2781 add_enum_psymbol (&di
, objfile
);
2793 scan_compilation_units -- build a psymtab entry for each compilation
2797 This is the top level dwarf parsing routine for building partial
2800 It scans from the beginning of the DWARF table looking for the first
2801 TAG_compile_unit DIE, and then follows the sibling chain to locate
2802 each additional TAG_compile_unit DIE.
2804 For each TAG_compile_unit DIE it creates a partial symtab structure,
2805 calls a subordinate routine to collect all the compilation unit's
2806 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2807 new partial symtab structure into the partial symbol table. It also
2808 records the appropriate information in the partial symbol table entry
2809 to allow the chunk of DIE's and line number table for this compilation
2810 unit to be located and re-read later, to generate a complete symbol
2811 table entry for the compilation unit.
2813 Thus it effectively partitions up a chunk of DIE's for multiple
2814 compilation units into smaller DIE chunks and line number tables,
2815 and associates them with a partial symbol table entry.
2819 If any compilation unit has no line number table associated with
2820 it for some reason (a missing at_stmt_list attribute, rather than
2821 just one with a value of zero, which is valid) then we ensure that
2822 the recorded file offset is zero so that the routine which later
2823 reads line number table fragments knows that there is no fragment
2833 scan_compilation_units (thisdie
, enddie
, dbfoff
, lnoffset
, objfile
)
2838 struct objfile
*objfile
;
2842 struct partial_symtab
*pst
;
2845 file_ptr curlnoffset
;
2847 while (thisdie
< enddie
)
2849 basicdieinfo (&di
, thisdie
, objfile
);
2850 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2854 else if (di
.die_tag
!= TAG_compile_unit
)
2856 nextdie
= thisdie
+ di
.die_length
;
2860 completedieinfo (&di
, objfile
);
2861 set_cu_language (&di
);
2862 if (di
.at_sibling
!= 0)
2864 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2868 nextdie
= thisdie
+ di
.die_length
;
2870 curoff
= thisdie
- dbbase
;
2871 culength
= nextdie
- thisdie
;
2872 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2874 /* First allocate a new partial symbol table structure */
2876 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2877 di
.at_name
, di
.at_low_pc
,
2878 objfile
-> global_psymbols
.next
,
2879 objfile
-> static_psymbols
.next
);
2881 pst
-> texthigh
= di
.at_high_pc
;
2882 pst
-> read_symtab_private
= (char *)
2883 obstack_alloc (&objfile
-> psymbol_obstack
,
2884 sizeof (struct dwfinfo
));
2885 DBFOFF (pst
) = dbfoff
;
2886 DBROFF (pst
) = curoff
;
2887 DBLENGTH (pst
) = culength
;
2888 LNFOFF (pst
) = curlnoffset
;
2889 pst
-> read_symtab
= dwarf_psymtab_to_symtab
;
2891 /* Now look for partial symbols */
2893 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2895 pst
-> n_global_syms
= objfile
-> global_psymbols
.next
-
2896 (objfile
-> global_psymbols
.list
+ pst
-> globals_offset
);
2897 pst
-> n_static_syms
= objfile
-> static_psymbols
.next
-
2898 (objfile
-> static_psymbols
.list
+ pst
-> statics_offset
);
2899 sort_pst_symbols (pst
);
2900 /* If there is already a psymtab or symtab for a file of this name,
2901 remove it. (If there is a symtab, more drastic things also
2902 happen.) This happens in VxWorks. */
2903 free_named_symtabs (pst
-> filename
);
2913 new_symbol -- make a symbol table entry for a new symbol
2917 static struct symbol *new_symbol (struct dieinfo *dip,
2918 struct objfile *objfile)
2922 Given a pointer to a DWARF information entry, figure out if we need
2923 to make a symbol table entry for it, and if so, create a new entry
2924 and return a pointer to it.
2927 static struct symbol
*
2928 new_symbol (dip
, objfile
)
2929 struct dieinfo
*dip
;
2930 struct objfile
*objfile
;
2932 struct symbol
*sym
= NULL
;
2934 if (dip
-> at_name
!= NULL
)
2936 sym
= (struct symbol
*) obstack_alloc (&objfile
-> symbol_obstack
,
2937 sizeof (struct symbol
));
2938 OBJSTAT (objfile
, n_syms
++);
2939 memset (sym
, 0, sizeof (struct symbol
));
2940 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2941 &objfile
->symbol_obstack
);
2942 /* default assumptions */
2943 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2944 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2945 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2947 /* If this symbol is from a C++ compilation, then attempt to cache the
2948 demangled form for future reference. This is a typical time versus
2949 space tradeoff, that was decided in favor of time because it sped up
2950 C++ symbol lookups by a factor of about 20. */
2952 SYMBOL_LANGUAGE (sym
) = cu_language
;
2953 SYMBOL_INIT_DEMANGLED_NAME (sym
, &objfile
-> symbol_obstack
);
2954 switch (dip
-> die_tag
)
2957 SYMBOL_VALUE_ADDRESS (sym
) = dip
-> at_low_pc
;
2958 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2960 case TAG_global_subroutine
:
2961 case TAG_subroutine
:
2962 SYMBOL_VALUE_ADDRESS (sym
) = dip
-> at_low_pc
;
2963 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2964 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2965 if (dip
-> die_tag
== TAG_global_subroutine
)
2967 add_symbol_to_list (sym
, &global_symbols
);
2971 add_symbol_to_list (sym
, list_in_scope
);
2974 case TAG_global_variable
:
2975 if (dip
-> at_location
!= NULL
)
2977 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2978 add_symbol_to_list (sym
, &global_symbols
);
2979 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2980 SYMBOL_VALUE (sym
) += baseaddr
;
2983 case TAG_local_variable
:
2984 if (dip
-> at_location
!= NULL
)
2986 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2987 add_symbol_to_list (sym
, list_in_scope
);
2990 SYMBOL_CLASS (sym
) = LOC_OPTIMIZED_OUT
;
2994 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2998 SYMBOL_CLASS (sym
) = LOC_BASEREG
;
2999 SYMBOL_BASEREG (sym
) = basereg
;
3003 SYMBOL_CLASS (sym
) = LOC_STATIC
;
3004 SYMBOL_VALUE (sym
) += baseaddr
;
3008 case TAG_formal_parameter
:
3009 if (dip
-> at_location
!= NULL
)
3011 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
3013 add_symbol_to_list (sym
, list_in_scope
);
3016 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
3020 SYMBOL_CLASS (sym
) = LOC_BASEREG_ARG
;
3021 SYMBOL_BASEREG (sym
) = basereg
;
3025 SYMBOL_CLASS (sym
) = LOC_ARG
;
3028 case TAG_unspecified_parameters
:
3029 /* From varargs functions; gdb doesn't seem to have any interest in
3030 this information, so just ignore it for now. (FIXME?) */
3032 case TAG_class_type
:
3033 case TAG_structure_type
:
3034 case TAG_union_type
:
3035 case TAG_enumeration_type
:
3036 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3037 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
3038 add_symbol_to_list (sym
, list_in_scope
);
3041 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3042 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3043 add_symbol_to_list (sym
, list_in_scope
);
3046 /* Not a tag we recognize. Hopefully we aren't processing trash
3047 data, but since we must specifically ignore things we don't
3048 recognize, there is nothing else we should do at this point. */
3059 synthesize_typedef -- make a symbol table entry for a "fake" typedef
3063 static void synthesize_typedef (struct dieinfo *dip,
3064 struct objfile *objfile,
3069 Given a pointer to a DWARF information entry, synthesize a typedef
3070 for the name in the DIE, using the specified type.
3072 This is used for C++ class, structs, unions, and enumerations to
3073 set up the tag name as a type.
3078 synthesize_typedef (dip
, objfile
, type
)
3079 struct dieinfo
*dip
;
3080 struct objfile
*objfile
;
3083 struct symbol
*sym
= NULL
;
3085 if (dip
-> at_name
!= NULL
)
3087 sym
= (struct symbol
*)
3088 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symbol
));
3089 OBJSTAT (objfile
, n_syms
++);
3090 memset (sym
, 0, sizeof (struct symbol
));
3091 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
3092 &objfile
->symbol_obstack
);
3093 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
3094 SYMBOL_TYPE (sym
) = type
;
3095 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3096 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3097 add_symbol_to_list (sym
, list_in_scope
);
3105 decode_mod_fund_type -- decode a modified fundamental type
3109 static struct type *decode_mod_fund_type (char *typedata)
3113 Decode a block of data containing a modified fundamental
3114 type specification. TYPEDATA is a pointer to the block,
3115 which starts with a length containing the size of the rest
3116 of the block. At the end of the block is a fundmental type
3117 code value that gives the fundamental type. Everything
3118 in between are type modifiers.
3120 We simply compute the number of modifiers and call the general
3121 function decode_modified_type to do the actual work.
3124 static struct type
*
3125 decode_mod_fund_type (typedata
)
3128 struct type
*typep
= NULL
;
3129 unsigned short modcount
;
3132 /* Get the total size of the block, exclusive of the size itself */
3134 nbytes
= attribute_size (AT_mod_fund_type
);
3135 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3138 /* Deduct the size of the fundamental type bytes at the end of the block. */
3140 modcount
-= attribute_size (AT_fund_type
);
3142 /* Now do the actual decoding */
3144 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3152 decode_mod_u_d_type -- decode a modified user defined type
3156 static struct type *decode_mod_u_d_type (char *typedata)
3160 Decode a block of data containing a modified user defined
3161 type specification. TYPEDATA is a pointer to the block,
3162 which consists of a two byte length, containing the size
3163 of the rest of the block. At the end of the block is a
3164 four byte value that gives a reference to a user defined type.
3165 Everything in between are type modifiers.
3167 We simply compute the number of modifiers and call the general
3168 function decode_modified_type to do the actual work.
3171 static struct type
*
3172 decode_mod_u_d_type (typedata
)
3175 struct type
*typep
= NULL
;
3176 unsigned short modcount
;
3179 /* Get the total size of the block, exclusive of the size itself */
3181 nbytes
= attribute_size (AT_mod_u_d_type
);
3182 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3185 /* Deduct the size of the reference type bytes at the end of the block. */
3187 modcount
-= attribute_size (AT_user_def_type
);
3189 /* Now do the actual decoding */
3191 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3199 decode_modified_type -- decode modified user or fundamental type
3203 static struct type *decode_modified_type (char *modifiers,
3204 unsigned short modcount, int mtype)
3208 Decode a modified type, either a modified fundamental type or
3209 a modified user defined type. MODIFIERS is a pointer to the
3210 block of bytes that define MODCOUNT modifiers. Immediately
3211 following the last modifier is a short containing the fundamental
3212 type or a long containing the reference to the user defined
3213 type. Which one is determined by MTYPE, which is either
3214 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3215 type we are generating.
3217 We call ourself recursively to generate each modified type,`
3218 until MODCOUNT reaches zero, at which point we have consumed
3219 all the modifiers and generate either the fundamental type or
3220 user defined type. When the recursion unwinds, each modifier
3221 is applied in turn to generate the full modified type.
3225 If we find a modifier that we don't recognize, and it is not one
3226 of those reserved for application specific use, then we issue a
3227 warning and simply ignore the modifier.
3231 We currently ignore MOD_const and MOD_volatile. (FIXME)
3235 static struct type
*
3236 decode_modified_type (modifiers
, modcount
, mtype
)
3238 unsigned int modcount
;
3241 struct type
*typep
= NULL
;
3242 unsigned short fundtype
;
3251 case AT_mod_fund_type
:
3252 nbytes
= attribute_size (AT_fund_type
);
3253 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3255 typep
= decode_fund_type (fundtype
);
3257 case AT_mod_u_d_type
:
3258 nbytes
= attribute_size (AT_user_def_type
);
3259 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3261 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3263 typep
= alloc_utype (die_ref
, NULL
);
3267 complain (&botched_modified_type
, DIE_ID
, DIE_NAME
, mtype
);
3268 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3274 modifier
= *modifiers
++;
3275 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3278 case MOD_pointer_to
:
3279 typep
= lookup_pointer_type (typep
);
3281 case MOD_reference_to
:
3282 typep
= lookup_reference_type (typep
);
3285 complain (&const_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3288 complain (&volatile_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3291 if (!(MOD_lo_user
<= (unsigned char) modifier
3292 && (unsigned char) modifier
<= MOD_hi_user
))
3294 complain (&unknown_type_modifier
, DIE_ID
, DIE_NAME
, modifier
);
3306 decode_fund_type -- translate basic DWARF type to gdb base type
3310 Given an integer that is one of the fundamental DWARF types,
3311 translate it to one of the basic internal gdb types and return
3312 a pointer to the appropriate gdb type (a "struct type *").
3316 For robustness, if we are asked to translate a fundamental
3317 type that we are unprepared to deal with, we return int so
3318 callers can always depend upon a valid type being returned,
3319 and so gdb may at least do something reasonable by default.
3320 If the type is not in the range of those types defined as
3321 application specific types, we also issue a warning.
3324 static struct type
*
3325 decode_fund_type (fundtype
)
3326 unsigned int fundtype
;
3328 struct type
*typep
= NULL
;
3334 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3337 case FT_boolean
: /* Was FT_set in AT&T version */
3338 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3341 case FT_pointer
: /* (void *) */
3342 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3343 typep
= lookup_pointer_type (typep
);
3347 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3350 case FT_signed_char
:
3351 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3354 case FT_unsigned_char
:
3355 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3359 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3362 case FT_signed_short
:
3363 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3366 case FT_unsigned_short
:
3367 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3371 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3374 case FT_signed_integer
:
3375 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3378 case FT_unsigned_integer
:
3379 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3383 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3386 case FT_signed_long
:
3387 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3390 case FT_unsigned_long
:
3391 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3395 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3398 case FT_signed_long_long
:
3399 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3402 case FT_unsigned_long_long
:
3403 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3407 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3410 case FT_dbl_prec_float
:
3411 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3414 case FT_ext_prec_float
:
3415 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3419 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3422 case FT_dbl_prec_complex
:
3423 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3426 case FT_ext_prec_complex
:
3427 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3434 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3435 if (!(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3437 complain (&unexpected_fund_type
, DIE_ID
, DIE_NAME
, fundtype
);
3448 create_name -- allocate a fresh copy of a string on an obstack
3452 Given a pointer to a string and a pointer to an obstack, allocates
3453 a fresh copy of the string on the specified obstack.
3458 create_name (name
, obstackp
)
3460 struct obstack
*obstackp
;
3465 length
= strlen (name
) + 1;
3466 newname
= (char *) obstack_alloc (obstackp
, length
);
3467 strcpy (newname
, name
);
3475 basicdieinfo -- extract the minimal die info from raw die data
3479 void basicdieinfo (char *diep, struct dieinfo *dip,
3480 struct objfile *objfile)
3484 Given a pointer to raw DIE data, and a pointer to an instance of a
3485 die info structure, this function extracts the basic information
3486 from the DIE data required to continue processing this DIE, along
3487 with some bookkeeping information about the DIE.
3489 The information we absolutely must have includes the DIE tag,
3490 and the DIE length. If we need the sibling reference, then we
3491 will have to call completedieinfo() to process all the remaining
3494 Note that since there is no guarantee that the data is properly
3495 aligned in memory for the type of access required (indirection
3496 through anything other than a char pointer), and there is no
3497 guarantee that it is in the same byte order as the gdb host,
3498 we call a function which deals with both alignment and byte
3499 swapping issues. Possibly inefficient, but quite portable.
3501 We also take care of some other basic things at this point, such
3502 as ensuring that the instance of the die info structure starts
3503 out completely zero'd and that curdie is initialized for use
3504 in error reporting if we have a problem with the current die.
3508 All DIE's must have at least a valid length, thus the minimum
3509 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3510 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3511 are forced to be TAG_padding DIES.
3513 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3514 that if a padding DIE is used for alignment and the amount needed is
3515 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3516 enough to align to the next alignment boundry.
3518 We do some basic sanity checking here, such as verifying that the
3519 length of the die would not cause it to overrun the recorded end of
3520 the buffer holding the DIE info. If we find a DIE that is either
3521 too small or too large, we force it's length to zero which should
3522 cause the caller to take appropriate action.
3526 basicdieinfo (dip
, diep
, objfile
)
3527 struct dieinfo
*dip
;
3529 struct objfile
*objfile
;
3532 memset (dip
, 0, sizeof (struct dieinfo
));
3534 dip
-> die_ref
= dbroff
+ (diep
- dbbase
);
3535 dip
-> die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3537 if ((dip
-> die_length
< SIZEOF_DIE_LENGTH
) ||
3538 ((diep
+ dip
-> die_length
) > (dbbase
+ dbsize
)))
3540 complain (&malformed_die
, DIE_ID
, DIE_NAME
, dip
-> die_length
);
3541 dip
-> die_length
= 0;
3543 else if (dip
-> die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3545 dip
-> die_tag
= TAG_padding
;
3549 diep
+= SIZEOF_DIE_LENGTH
;
3550 dip
-> die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3559 completedieinfo -- finish reading the information for a given DIE
3563 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3567 Given a pointer to an already partially initialized die info structure,
3568 scan the raw DIE data and finish filling in the die info structure
3569 from the various attributes found.
3571 Note that since there is no guarantee that the data is properly
3572 aligned in memory for the type of access required (indirection
3573 through anything other than a char pointer), and there is no
3574 guarantee that it is in the same byte order as the gdb host,
3575 we call a function which deals with both alignment and byte
3576 swapping issues. Possibly inefficient, but quite portable.
3580 Each time we are called, we increment the diecount variable, which
3581 keeps an approximate count of the number of dies processed for
3582 each compilation unit. This information is presented to the user
3583 if the info_verbose flag is set.
3588 completedieinfo (dip
, objfile
)
3589 struct dieinfo
*dip
;
3590 struct objfile
*objfile
;
3592 char *diep
; /* Current pointer into raw DIE data */
3593 char *end
; /* Terminate DIE scan here */
3594 unsigned short attr
; /* Current attribute being scanned */
3595 unsigned short form
; /* Form of the attribute */
3596 int nbytes
; /* Size of next field to read */
3600 end
= diep
+ dip
-> die_length
;
3601 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3604 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3605 diep
+= SIZEOF_ATTRIBUTE
;
3606 if ((nbytes
= attribute_size (attr
)) == -1)
3608 complain (&unknown_attribute_length
, DIE_ID
, DIE_NAME
);
3615 dip
-> at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3619 dip
-> at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3623 dip
-> at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3627 dip
-> at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3631 dip
-> at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3633 dip
-> has_at_stmt_list
= 1;
3636 dip
-> at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3638 dip
-> at_low_pc
+= baseaddr
;
3639 dip
-> has_at_low_pc
= 1;
3642 dip
-> at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3644 dip
-> at_high_pc
+= baseaddr
;
3647 dip
-> at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3650 case AT_user_def_type
:
3651 dip
-> at_user_def_type
= target_to_host (diep
, nbytes
,
3652 GET_UNSIGNED
, objfile
);
3655 dip
-> at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3657 dip
-> has_at_byte_size
= 1;
3660 dip
-> at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3664 dip
-> at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3668 dip
-> at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3672 dip
-> at_location
= diep
;
3674 case AT_mod_fund_type
:
3675 dip
-> at_mod_fund_type
= diep
;
3677 case AT_subscr_data
:
3678 dip
-> at_subscr_data
= diep
;
3680 case AT_mod_u_d_type
:
3681 dip
-> at_mod_u_d_type
= diep
;
3683 case AT_element_list
:
3684 dip
-> at_element_list
= diep
;
3685 dip
-> short_element_list
= 0;
3687 case AT_short_element_list
:
3688 dip
-> at_element_list
= diep
;
3689 dip
-> short_element_list
= 1;
3691 case AT_discr_value
:
3692 dip
-> at_discr_value
= diep
;
3694 case AT_string_length
:
3695 dip
-> at_string_length
= diep
;
3698 dip
-> at_name
= diep
;
3701 /* For now, ignore any "hostname:" portion, since gdb doesn't
3702 know how to deal with it. (FIXME). */
3703 dip
-> at_comp_dir
= strrchr (diep
, ':');
3704 if (dip
-> at_comp_dir
!= NULL
)
3706 dip
-> at_comp_dir
++;
3710 dip
-> at_comp_dir
= diep
;
3714 dip
-> at_producer
= diep
;
3716 case AT_start_scope
:
3717 dip
-> at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3720 case AT_stride_size
:
3721 dip
-> at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3725 dip
-> at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3729 dip
-> at_prototyped
= diep
;
3732 /* Found an attribute that we are unprepared to handle. However
3733 it is specifically one of the design goals of DWARF that
3734 consumers should ignore unknown attributes. As long as the
3735 form is one that we recognize (so we know how to skip it),
3736 we can just ignore the unknown attribute. */
3739 form
= FORM_FROM_ATTR (attr
);
3753 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3756 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3759 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3762 diep
+= strlen (diep
) + 1;
3765 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);
3776 target_to_host -- swap in target data to host
3780 target_to_host (char *from, int nbytes, int signextend,
3781 struct objfile *objfile)
3785 Given pointer to data in target format in FROM, a byte count for
3786 the size of the data in NBYTES, a flag indicating whether or not
3787 the data is signed in SIGNEXTEND, and a pointer to the current
3788 objfile in OBJFILE, convert the data to host format and return
3789 the converted value.
3793 FIXME: If we read data that is known to be signed, and expect to
3794 use it as signed data, then we need to explicitly sign extend the
3795 result until the bfd library is able to do this for us.
3797 FIXME: Would a 32 bit target ever need an 8 byte result?
3802 target_to_host (from
, nbytes
, signextend
, objfile
)
3805 int signextend
; /* FIXME: Unused */
3806 struct objfile
*objfile
;
3813 rtnval
= bfd_get_64 (objfile
-> obfd
, (bfd_byte
*) from
);
3816 rtnval
= bfd_get_32 (objfile
-> obfd
, (bfd_byte
*) from
);
3819 rtnval
= bfd_get_16 (objfile
-> obfd
, (bfd_byte
*) from
);
3822 rtnval
= bfd_get_8 (objfile
-> obfd
, (bfd_byte
*) from
);
3825 complain (&no_bfd_get_N
, DIE_ID
, DIE_NAME
, nbytes
);
3836 attribute_size -- compute size of data for a DWARF attribute
3840 static int attribute_size (unsigned int attr)
3844 Given a DWARF attribute in ATTR, compute the size of the first
3845 piece of data associated with this attribute and return that
3848 Returns -1 for unrecognized attributes.
3853 attribute_size (attr
)
3856 int nbytes
; /* Size of next data for this attribute */
3857 unsigned short form
; /* Form of the attribute */
3859 form
= FORM_FROM_ATTR (attr
);
3862 case FORM_STRING
: /* A variable length field is next */
3865 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3866 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3869 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3870 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3871 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3874 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3877 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3878 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3881 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);