1 /* DWARF debugging format support for GDB.
2 Copyright (C) 1991, 1992 Free Software Foundation, Inc.
3 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
4 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 FIXME: Figure out how to get the frame pointer register number in the
25 execution environment of the target. Remove R_FP kludge
27 FIXME: Add generation of dependencies list to partial symtab code.
29 FIXME: Resolve minor differences between what information we put in the
30 partial symbol table and what dbxread puts in. For example, we don't yet
31 put enum constants there. And dbxread seems to invent a lot of typedefs
32 we never see. Use the new printpsym command to see the partial symbol table
35 FIXME: Figure out a better way to tell gdb about the name of the function
36 contain the user's entry point (I.E. main())
38 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
39 other things to work on, if you get bored. :-)
49 #include "libbfd.h" /* FIXME Secret Internal BFD stuff (bfd_read) */
50 #include "elf/dwarf.h"
53 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
55 #include "complaints.h"
59 #include <sys/types.h>
65 /* FIXME -- convert this to SEEK_SET a la POSIX, move to config files. */
70 /* Some macros to provide DIE info for complaints. */
72 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
73 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
75 /* Complaints that can be issued during DWARF debug info reading. */
77 struct complaint no_bfd_get_N
=
79 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object", 0, 0
82 struct complaint malformed_die
=
84 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%d bytes)", 0, 0
87 struct complaint bad_die_ref
=
89 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit", 0, 0
92 struct complaint unknown_attribute_form
=
94 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", 0, 0
97 struct complaint unknown_attribute_length
=
99 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes", 0, 0
102 struct complaint unexpected_fund_type
=
104 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x", 0, 0
107 struct complaint unknown_type_modifier
=
109 "DIE @ 0x%x \"%s\", unknown type modifier %u", 0, 0
112 struct complaint volatile_ignored
=
114 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored", 0, 0
117 struct complaint const_ignored
=
119 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", 0, 0
122 struct complaint botched_modified_type
=
124 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)", 0, 0
127 struct complaint op_deref2
=
129 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%x not handled", 0, 0
132 struct complaint op_deref4
=
134 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%x not handled", 0, 0
137 struct complaint basereg_not_handled
=
139 "DIE @ 0x%x \"%s\", BASEREG %d not handled", 0, 0
142 struct complaint dup_user_type_allocation
=
144 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation", 0, 0
147 struct complaint dup_user_type_definition
=
149 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition", 0, 0
152 struct complaint missing_tag
=
154 "DIE @ 0x%x \"%s\", missing class, structure, or union tag", 0, 0
157 struct complaint bad_array_element_type
=
159 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", 0, 0
162 struct complaint subscript_data_items
=
164 "DIE @ 0x%x \"%s\", can't decode subscript data items", 0, 0
167 struct complaint unhandled_array_subscript_format
=
169 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet", 0, 0
172 struct complaint unknown_array_subscript_format
=
174 "DIE @ 0x%x \"%s\", unknown array subscript format %x", 0, 0
177 struct complaint not_row_major
=
179 "DIE @ 0x%x \"%s\", array not row major; not handled correctly", 0, 0
182 #ifndef R_FP /* FIXME */
183 #define R_FP 14 /* Kludge to get frame pointer register number */
186 typedef unsigned int DIE_REF
; /* Reference to a DIE */
189 #define GCC_PRODUCER "GNU C "
192 #ifndef GPLUS_PRODUCER
193 #define GPLUS_PRODUCER "GNU C++ "
197 #define LCC_PRODUCER "NCR C/C++"
200 #ifndef CFRONT_PRODUCER
201 #define CFRONT_PRODUCER "CFRONT " /* A wild a** guess... */
204 /* start-sanitize-chill */
205 #ifndef CHILL_PRODUCER
206 #define CHILL_PRODUCER "GNU Chill "
208 /* end-sanitize-chill */
210 #define STREQ(a,b) (strcmp(a,b)==0)
211 #define STREQN(a,b,n) (strncmp(a,b,n)==0)
213 /* Flags to target_to_host() that tell whether or not the data object is
214 expected to be signed. Used, for example, when fetching a signed
215 integer in the target environment which is used as a signed integer
216 in the host environment, and the two environments have different sized
217 ints. In this case, *somebody* has to sign extend the smaller sized
220 #define GET_UNSIGNED 0 /* No sign extension required */
221 #define GET_SIGNED 1 /* Sign extension required */
223 /* Defines for things which are specified in the document "DWARF Debugging
224 Information Format" published by UNIX International, Programming Languages
225 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
227 #define SIZEOF_DIE_LENGTH 4
228 #define SIZEOF_DIE_TAG 2
229 #define SIZEOF_ATTRIBUTE 2
230 #define SIZEOF_FORMAT_SPECIFIER 1
231 #define SIZEOF_FMT_FT 2
232 #define SIZEOF_LINETBL_LENGTH 4
233 #define SIZEOF_LINETBL_LINENO 4
234 #define SIZEOF_LINETBL_STMT 2
235 #define SIZEOF_LINETBL_DELTA 4
236 #define SIZEOF_LOC_ATOM_CODE 1
238 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
240 /* Macros that return the sizes of various types of data in the target
243 FIXME: Currently these are just compile time constants (as they are in
244 other parts of gdb as well). They need to be able to get the right size
245 either from the bfd or possibly from the DWARF info. It would be nice if
246 the DWARF producer inserted DIES that describe the fundamental types in
247 the target environment into the DWARF info, similar to the way dbx stabs
248 producers produce information about their fundamental types. */
250 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
251 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
253 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
254 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
255 However, the Issue 2 DWARF specification from AT&T defines it as
256 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
257 For backwards compatibility with the AT&T compiler produced executables
258 we define AT_short_element_list for this variant. */
260 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
262 /* External variables referenced. */
264 extern int info_verbose
; /* From main.c; nonzero => verbose */
265 extern char *warning_pre_print
; /* From utils.c */
267 /* The DWARF debugging information consists of two major pieces,
268 one is a block of DWARF Information Entries (DIE's) and the other
269 is a line number table. The "struct dieinfo" structure contains
270 the information for a single DIE, the one currently being processed.
272 In order to make it easier to randomly access the attribute fields
273 of the current DIE, which are specifically unordered within the DIE,
274 each DIE is scanned and an instance of the "struct dieinfo"
275 structure is initialized.
277 Initialization is done in two levels. The first, done by basicdieinfo(),
278 just initializes those fields that are vital to deciding whether or not
279 to use this DIE, how to skip past it, etc. The second, done by the
280 function completedieinfo(), fills in the rest of the information.
282 Attributes which have block forms are not interpreted at the time
283 the DIE is scanned, instead we just save pointers to the start
284 of their value fields.
286 Some fields have a flag <name>_p that is set when the value of the
287 field is valid (I.E. we found a matching attribute in the DIE). Since
288 we may want to test for the presence of some attributes in the DIE,
289 such as AT_low_pc, without restricting the values of the field,
290 we need someway to note that we found such an attribute.
297 char * die
; /* Pointer to the raw DIE data */
298 unsigned long die_length
; /* Length of the raw DIE data */
299 DIE_REF die_ref
; /* Offset of this DIE */
300 unsigned short die_tag
; /* Tag for this DIE */
301 unsigned long at_padding
;
302 unsigned long at_sibling
;
305 unsigned short at_fund_type
;
306 BLOCK
* at_mod_fund_type
;
307 unsigned long at_user_def_type
;
308 BLOCK
* at_mod_u_d_type
;
309 unsigned short at_ordering
;
310 BLOCK
* at_subscr_data
;
311 unsigned long at_byte_size
;
312 unsigned short at_bit_offset
;
313 unsigned long at_bit_size
;
314 BLOCK
* at_element_list
;
315 unsigned long at_stmt_list
;
316 unsigned long at_low_pc
;
317 unsigned long at_high_pc
;
318 unsigned long at_language
;
319 unsigned long at_member
;
320 unsigned long at_discr
;
321 BLOCK
* at_discr_value
;
322 BLOCK
* at_string_length
;
325 unsigned long at_start_scope
;
326 unsigned long at_stride_size
;
327 unsigned long at_src_info
;
328 char * at_prototyped
;
329 unsigned int has_at_low_pc
:1;
330 unsigned int has_at_stmt_list
:1;
331 unsigned int has_at_byte_size
:1;
332 unsigned int short_element_list
:1;
335 static int diecount
; /* Approximate count of dies for compilation unit */
336 static struct dieinfo
*curdie
; /* For warnings and such */
338 static char *dbbase
; /* Base pointer to dwarf info */
339 static int dbsize
; /* Size of dwarf info in bytes */
340 static int dbroff
; /* Relative offset from start of .debug section */
341 static char *lnbase
; /* Base pointer to line section */
342 static int isreg
; /* Kludge to identify register variables */
343 static int offreg
; /* Kludge to identify basereg references */
345 /* This value is added to each symbol value. FIXME: Generalize to
346 the section_offsets structure used by dbxread. */
347 static CORE_ADDR baseaddr
; /* Add to each symbol value */
349 /* The section offsets used in the current psymtab or symtab. FIXME,
350 only used to pass one value (baseaddr) at the moment. */
351 static struct section_offsets
*base_section_offsets
;
353 /* Each partial symbol table entry contains a pointer to private data for the
354 read_symtab() function to use when expanding a partial symbol table entry
355 to a full symbol table entry. For DWARF debugging info, this data is
356 contained in the following structure and macros are provided for easy
357 access to the members given a pointer to a partial symbol table entry.
359 dbfoff Always the absolute file offset to the start of the ".debug"
360 section for the file containing the DIE's being accessed.
362 dbroff Relative offset from the start of the ".debug" access to the
363 first DIE to be accessed. When building the partial symbol
364 table, this value will be zero since we are accessing the
365 entire ".debug" section. When expanding a partial symbol
366 table entry, this value will be the offset to the first
367 DIE for the compilation unit containing the symbol that
368 triggers the expansion.
370 dblength The size of the chunk of DIE's being examined, in bytes.
372 lnfoff The absolute file offset to the line table fragment. Ignored
373 when building partial symbol tables, but used when expanding
374 them, and contains the absolute file offset to the fragment
375 of the ".line" section containing the line numbers for the
376 current compilation unit.
380 file_ptr dbfoff
; /* Absolute file offset to start of .debug section */
381 int dbroff
; /* Relative offset from start of .debug section */
382 int dblength
; /* Size of the chunk of DIE's being examined */
383 file_ptr lnfoff
; /* Absolute file offset to line table fragment */
386 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
387 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
388 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
389 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
391 /* The generic symbol table building routines have separate lists for
392 file scope symbols and all all other scopes (local scopes). So
393 we need to select the right one to pass to add_symbol_to_list().
394 We do it by keeping a pointer to the correct list in list_in_scope.
396 FIXME: The original dwarf code just treated the file scope as the first
397 local scope, and all other local scopes as nested local scopes, and worked
398 fine. Check to see if we really need to distinguish these in buildsym.c */
400 struct pending
**list_in_scope
= &file_symbols
;
402 /* DIES which have user defined types or modified user defined types refer to
403 other DIES for the type information. Thus we need to associate the offset
404 of a DIE for a user defined type with a pointer to the type information.
406 Originally this was done using a simple but expensive algorithm, with an
407 array of unsorted structures, each containing an offset/type-pointer pair.
408 This array was scanned linearly each time a lookup was done. The result
409 was that gdb was spending over half it's startup time munging through this
410 array of pointers looking for a structure that had the right offset member.
412 The second attempt used the same array of structures, but the array was
413 sorted using qsort each time a new offset/type was recorded, and a binary
414 search was used to find the type pointer for a given DIE offset. This was
415 even slower, due to the overhead of sorting the array each time a new
416 offset/type pair was entered.
418 The third attempt uses a fixed size array of type pointers, indexed by a
419 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
420 we can divide any DIE offset by 4 to obtain a unique index into this fixed
421 size array. Since each element is a 4 byte pointer, it takes exactly as
422 much memory to hold this array as to hold the DWARF info for a given
423 compilation unit. But it gets freed as soon as we are done with it.
424 This has worked well in practice, as a reasonable tradeoff between memory
425 consumption and speed, without having to resort to much more complicated
428 static struct type
**utypes
; /* Pointer to array of user type pointers */
429 static int numutypes
; /* Max number of user type pointers */
431 /* Maintain an array of referenced fundamental types for the current
432 compilation unit being read. For DWARF version 1, we have to construct
433 the fundamental types on the fly, since no information about the
434 fundamental types is supplied. Each such fundamental type is created by
435 calling a language dependent routine to create the type, and then a
436 pointer to that type is then placed in the array at the index specified
437 by it's FT_<TYPENAME> value. The array has a fixed size set by the
438 FT_NUM_MEMBERS compile time constant, which is the number of predefined
439 fundamental types gdb knows how to construct. */
441 static struct type
*ftypes
[FT_NUM_MEMBERS
]; /* Fundamental types */
443 /* Record the language for the compilation unit which is currently being
444 processed. We know it once we have seen the TAG_compile_unit DIE,
445 and we need it while processing the DIE's for that compilation unit.
446 It is eventually saved in the symtab structure, but we don't finalize
447 the symtab struct until we have processed all the DIE's for the
448 compilation unit. We also need to get and save a pointer to the
449 language struct for this language, so we can call the language
450 dependent routines for doing things such as creating fundamental
453 static enum language cu_language
;
454 static const struct language_defn
*cu_language_defn
;
456 /* Forward declarations of static functions so we don't have to worry
457 about ordering within this file. */
460 attribute_size
PARAMS ((unsigned int));
463 target_to_host
PARAMS ((char *, int, int, struct objfile
*));
466 add_enum_psymbol
PARAMS ((struct dieinfo
*, struct objfile
*));
469 handle_producer
PARAMS ((char *));
472 read_file_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
475 read_func_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
478 read_lexical_block_scope
PARAMS ((struct dieinfo
*, char *, char *,
482 scan_partial_symbols
PARAMS ((char *, char *, struct objfile
*));
485 scan_compilation_units
PARAMS ((char *, char *, file_ptr
,
486 file_ptr
, struct objfile
*));
489 add_partial_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
492 init_psymbol_list
PARAMS ((struct objfile
*, int));
495 basicdieinfo
PARAMS ((struct dieinfo
*, char *, struct objfile
*));
498 completedieinfo
PARAMS ((struct dieinfo
*, struct objfile
*));
501 dwarf_psymtab_to_symtab
PARAMS ((struct partial_symtab
*));
504 psymtab_to_symtab_1
PARAMS ((struct partial_symtab
*));
506 static struct symtab
*
507 read_ofile_symtab
PARAMS ((struct partial_symtab
*));
510 process_dies
PARAMS ((char *, char *, struct objfile
*));
513 read_structure_scope
PARAMS ((struct dieinfo
*, char *, char *,
517 decode_array_element_type
PARAMS ((char *));
520 decode_subscript_data_item
PARAMS ((char *, char *));
523 dwarf_read_array_type
PARAMS ((struct dieinfo
*));
526 read_tag_pointer_type
PARAMS ((struct dieinfo
*dip
));
529 read_subroutine_type
PARAMS ((struct dieinfo
*, char *, char *));
532 read_enumeration
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
535 struct_type
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
538 enum_type
PARAMS ((struct dieinfo
*, struct objfile
*));
541 decode_line_numbers
PARAMS ((char *));
544 decode_die_type
PARAMS ((struct dieinfo
*));
547 decode_mod_fund_type
PARAMS ((char *));
550 decode_mod_u_d_type
PARAMS ((char *));
553 decode_modified_type
PARAMS ((char *, unsigned int, int));
556 decode_fund_type
PARAMS ((unsigned int));
559 create_name
PARAMS ((char *, struct obstack
*));
562 lookup_utype
PARAMS ((DIE_REF
));
565 alloc_utype
PARAMS ((DIE_REF
, struct type
*));
567 static struct symbol
*
568 new_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
571 synthesize_typedef
PARAMS ((struct dieinfo
*, struct objfile
*,
575 locval
PARAMS ((char *));
578 record_minimal_symbol
PARAMS ((char *, CORE_ADDR
, enum minimal_symbol_type
,
582 set_cu_language
PARAMS ((struct dieinfo
*));
585 dwarf_fundamental_type
PARAMS ((struct objfile
*, int));
592 dwarf_fundamental_type -- lookup or create a fundamental type
597 dwarf_fundamental_type (struct objfile *objfile, int typeid)
601 DWARF version 1 doesn't supply any fundamental type information,
602 so gdb has to construct such types. It has a fixed number of
603 fundamental types that it knows how to construct, which is the
604 union of all types that it knows how to construct for all languages
605 that it knows about. These are enumerated in gdbtypes.h.
607 As an example, assume we find a DIE that references a DWARF
608 fundamental type of FT_integer. We first look in the ftypes
609 array to see if we already have such a type, indexed by the
610 gdb internal value of FT_INTEGER. If so, we simply return a
611 pointer to that type. If not, then we ask an appropriate
612 language dependent routine to create a type FT_INTEGER, using
613 defaults reasonable for the current target machine, and install
614 that type in ftypes for future reference.
618 Pointer to a fundamental type.
623 dwarf_fundamental_type (objfile
, typeid)
624 struct objfile
*objfile
;
627 if (typeid < 0 || typeid >= FT_NUM_MEMBERS
)
629 error ("internal error - invalid fundamental type id %d", typeid);
632 /* Look for this particular type in the fundamental type vector. If one is
633 not found, create and install one appropriate for the current language
634 and the current target machine. */
636 if (ftypes
[typeid] == NULL
)
638 ftypes
[typeid] = cu_language_defn
-> la_fund_type(objfile
, typeid);
641 return (ftypes
[typeid]);
648 set_cu_language -- set local copy of language for compilation unit
653 set_cu_language (struct dieinfo *dip)
657 Decode the language attribute for a compilation unit DIE and
658 remember what the language was. We use this at various times
659 when processing DIE's for a given compilation unit.
668 set_cu_language (dip
)
671 switch (dip
-> at_language
)
675 cu_language
= language_c
;
677 case LANG_C_PLUS_PLUS
:
678 cu_language
= language_cplus
;
680 /* start-sanitize-chill */
682 cu_language
= language_chill
;
684 /* end-sanitize-chill */
686 cu_language
= language_m2
;
695 cu_language
= language_unknown
;
698 cu_language_defn
= language_def (cu_language
);
705 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
709 void dwarf_build_psymtabs (struct objfile *objfile,
710 struct section_offsets *section_offsets,
711 int mainline, file_ptr dbfoff, unsigned int dbfsize,
712 file_ptr lnoffset, unsigned int lnsize)
716 This function is called upon to build partial symtabs from files
717 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
719 It is passed a bfd* containing the DIES
720 and line number information, the corresponding filename for that
721 file, a base address for relocating the symbols, a flag indicating
722 whether or not this debugging information is from a "main symbol
723 table" rather than a shared library or dynamically linked file,
724 and file offset/size pairs for the DIE information and line number
734 dwarf_build_psymtabs (objfile
, section_offsets
, mainline
, dbfoff
, dbfsize
,
736 struct objfile
*objfile
;
737 struct section_offsets
*section_offsets
;
740 unsigned int dbfsize
;
744 bfd
*abfd
= objfile
->obfd
;
745 struct cleanup
*back_to
;
747 current_objfile
= objfile
;
749 dbbase
= xmalloc (dbsize
);
751 if ((bfd_seek (abfd
, dbfoff
, L_SET
) != 0) ||
752 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
755 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
757 back_to
= make_cleanup (free
, dbbase
);
759 /* If we are reinitializing, or if we have never loaded syms yet, init.
760 Since we have no idea how many DIES we are looking at, we just guess
761 some arbitrary value. */
763 if (mainline
|| objfile
-> global_psymbols
.size
== 0 ||
764 objfile
-> static_psymbols
.size
== 0)
766 init_psymbol_list (objfile
, 1024);
769 /* Save the relocation factor where everybody can see it. */
771 base_section_offsets
= section_offsets
;
772 baseaddr
= ANOFFSET (section_offsets
, 0);
774 /* Follow the compilation unit sibling chain, building a partial symbol
775 table entry for each one. Save enough information about each compilation
776 unit to locate the full DWARF information later. */
778 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
780 do_cleanups (back_to
);
781 current_objfile
= NULL
;
789 record_minimal_symbol -- add entry to gdb's minimal symbol table
793 static void record_minimal_symbol (char *name, CORE_ADDR address,
794 enum minimal_symbol_type ms_type,
795 struct objfile *objfile)
799 Given a pointer to the name of a symbol that should be added to the
800 minimal symbol table, and the address associated with that
801 symbol, records this information for later use in building the
802 minimal symbol table.
807 record_minimal_symbol (name
, address
, ms_type
, objfile
)
810 enum minimal_symbol_type ms_type
;
811 struct objfile
*objfile
;
813 name
= obsavestring (name
, strlen (name
), &objfile
-> symbol_obstack
);
814 prim_record_minimal_symbol (name
, address
, ms_type
);
821 read_lexical_block_scope -- process all dies in a lexical block
825 static void read_lexical_block_scope (struct dieinfo *dip,
826 char *thisdie, char *enddie)
830 Process all the DIES contained within a lexical block scope.
831 Start a new scope, process the dies, and then close the scope.
836 read_lexical_block_scope (dip
, thisdie
, enddie
, objfile
)
840 struct objfile
*objfile
;
842 register struct context_stack
*new;
844 push_context (0, dip
-> at_low_pc
);
845 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
846 new = pop_context ();
847 if (local_symbols
!= NULL
)
849 finish_block (0, &local_symbols
, new -> old_blocks
, new -> start_addr
,
850 dip
-> at_high_pc
, objfile
);
852 local_symbols
= new -> locals
;
859 lookup_utype -- look up a user defined type from die reference
863 static type *lookup_utype (DIE_REF die_ref)
867 Given a DIE reference, lookup the user defined type associated with
868 that DIE, if it has been registered already. If not registered, then
869 return NULL. Alloc_utype() can be called to register an empty
870 type for this reference, which will be filled in later when the
871 actual referenced DIE is processed.
875 lookup_utype (die_ref
)
878 struct type
*type
= NULL
;
881 utypeidx
= (die_ref
- dbroff
) / 4;
882 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
884 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
888 type
= *(utypes
+ utypeidx
);
898 alloc_utype -- add a user defined type for die reference
902 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
906 Given a die reference DIE_REF, and a possible pointer to a user
907 defined type UTYPEP, register that this reference has a user
908 defined type and either use the specified type in UTYPEP or
909 make a new empty type that will be filled in later.
911 We should only be called after calling lookup_utype() to verify that
912 there is not currently a type registered for DIE_REF.
916 alloc_utype (die_ref
, utypep
)
923 utypeidx
= (die_ref
- dbroff
) / 4;
924 typep
= utypes
+ utypeidx
;
925 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
927 utypep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
928 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
930 else if (*typep
!= NULL
)
933 complain (&dup_user_type_allocation
, DIE_ID
, DIE_NAME
);
939 utypep
= alloc_type (current_objfile
);
950 decode_die_type -- return a type for a specified die
954 static struct type *decode_die_type (struct dieinfo *dip)
958 Given a pointer to a die information structure DIP, decode the
959 type of the die and return a pointer to the decoded type. All
960 dies without specific types default to type int.
964 decode_die_type (dip
)
967 struct type
*type
= NULL
;
969 if (dip
-> at_fund_type
!= 0)
971 type
= decode_fund_type (dip
-> at_fund_type
);
973 else if (dip
-> at_mod_fund_type
!= NULL
)
975 type
= decode_mod_fund_type (dip
-> at_mod_fund_type
);
977 else if (dip
-> at_user_def_type
)
979 if ((type
= lookup_utype (dip
-> at_user_def_type
)) == NULL
)
981 type
= alloc_utype (dip
-> at_user_def_type
, NULL
);
984 else if (dip
-> at_mod_u_d_type
)
986 type
= decode_mod_u_d_type (dip
-> at_mod_u_d_type
);
990 type
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
999 struct_type -- compute and return the type for a struct or union
1003 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
1004 char *enddie, struct objfile *objfile)
1008 Given pointer to a die information structure for a die which
1009 defines a union or structure (and MUST define one or the other),
1010 and pointers to the raw die data that define the range of dies which
1011 define the members, compute and return the user defined type for the
1015 static struct type
*
1016 struct_type (dip
, thisdie
, enddie
, objfile
)
1017 struct dieinfo
*dip
;
1020 struct objfile
*objfile
;
1024 struct nextfield
*next
;
1027 struct nextfield
*list
= NULL
;
1028 struct nextfield
*new;
1034 #if !BITS_BIG_ENDIAN
1038 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1040 /* No forward references created an empty type, so install one now */
1041 type
= alloc_utype (dip
-> die_ref
, NULL
);
1043 INIT_CPLUS_SPECIFIC(type
);
1044 switch (dip
-> die_tag
)
1046 case TAG_class_type
:
1047 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
1050 case TAG_structure_type
:
1051 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
1054 case TAG_union_type
:
1055 TYPE_CODE (type
) = TYPE_CODE_UNION
;
1059 /* Should never happen */
1060 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
1062 complain (&missing_tag
, DIE_ID
, DIE_NAME
);
1065 /* Some compilers try to be helpful by inventing "fake" names for
1066 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1067 Thanks, but no thanks... */
1068 if (dip
-> at_name
!= NULL
1069 && *dip
-> at_name
!= '~'
1070 && *dip
-> at_name
!= '.')
1072 TYPE_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1073 tpart1
, " ", dip
-> at_name
);
1075 /* Use whatever size is known. Zero is a valid size. We might however
1076 wish to check has_at_byte_size to make sure that some byte size was
1077 given explicitly, but DWARF doesn't specify that explicit sizes of
1078 zero have to present, so complaining about missing sizes should
1079 probably not be the default. */
1080 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1081 thisdie
+= dip
-> die_length
;
1082 while (thisdie
< enddie
)
1084 basicdieinfo (&mbr
, thisdie
, objfile
);
1085 completedieinfo (&mbr
, objfile
);
1086 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
1090 else if (mbr
.at_sibling
!= 0)
1092 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
1096 nextdie
= thisdie
+ mbr
.die_length
;
1098 switch (mbr
.die_tag
)
1101 /* Get space to record the next field's data. */
1102 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1105 /* Save the data. */
1106 list
-> field
.name
=
1107 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
1108 &objfile
-> type_obstack
);
1109 list
-> field
.type
= decode_die_type (&mbr
);
1110 list
-> field
.bitpos
= 8 * locval (mbr
.at_location
);
1111 /* Handle bit fields. */
1112 list
-> field
.bitsize
= mbr
.at_bit_size
;
1114 /* For big endian bits, the at_bit_offset gives the additional
1115 bit offset from the MSB of the containing anonymous object to
1116 the MSB of the field. We don't have to do anything special
1117 since we don't need to know the size of the anonymous object. */
1118 list
-> field
.bitpos
+= mbr
.at_bit_offset
;
1120 /* For little endian bits, we need to have a non-zero at_bit_size,
1121 so that we know we are in fact dealing with a bitfield. Compute
1122 the bit offset to the MSB of the anonymous object, subtract off
1123 the number of bits from the MSB of the field to the MSB of the
1124 object, and then subtract off the number of bits of the field
1125 itself. The result is the bit offset of the LSB of the field. */
1126 if (mbr
.at_bit_size
> 0)
1128 if (mbr
.has_at_byte_size
)
1130 /* The size of the anonymous object containing the bit field
1131 is explicit, so use the indicated size (in bytes). */
1132 anonymous_size
= mbr
.at_byte_size
;
1136 /* The size of the anonymous object containing the bit field
1137 matches the size of an object of the bit field's type.
1138 DWARF allows at_byte_size to be left out in such cases,
1139 as a debug information size optimization. */
1140 anonymous_size
= TYPE_LENGTH (list
-> field
.type
);
1142 list
-> field
.bitpos
+=
1143 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
1149 process_dies (thisdie
, nextdie
, objfile
);
1154 /* Now create the vector of fields, and record how big it is. We may
1155 not even have any fields, if this DIE was generated due to a reference
1156 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1157 set, which clues gdb in to the fact that it needs to search elsewhere
1158 for the full structure definition. */
1161 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1165 TYPE_NFIELDS (type
) = nfields
;
1166 TYPE_FIELDS (type
) = (struct field
*)
1167 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1168 /* Copy the saved-up fields into the field vector. */
1169 for (n
= nfields
; list
; list
= list
-> next
)
1171 TYPE_FIELD (type
, --n
) = list
-> field
;
1181 read_structure_scope -- process all dies within struct or union
1185 static void read_structure_scope (struct dieinfo *dip,
1186 char *thisdie, char *enddie, struct objfile *objfile)
1190 Called when we find the DIE that starts a structure or union
1191 scope (definition) to process all dies that define the members
1192 of the structure or union. DIP is a pointer to the die info
1193 struct for the DIE that names the structure or union.
1197 Note that we need to call struct_type regardless of whether or not
1198 the DIE has an at_name attribute, since it might be an anonymous
1199 structure or union. This gets the type entered into our set of
1202 However, if the structure is incomplete (an opaque struct/union)
1203 then suppress creating a symbol table entry for it since gdb only
1204 wants to find the one with the complete definition. Note that if
1205 it is complete, we just call new_symbol, which does it's own
1206 checking about whether the struct/union is anonymous or not (and
1207 suppresses creating a symbol table entry itself).
1212 read_structure_scope (dip
, thisdie
, enddie
, objfile
)
1213 struct dieinfo
*dip
;
1216 struct objfile
*objfile
;
1221 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1222 if (!(TYPE_FLAGS (type
) & TYPE_FLAG_STUB
))
1224 sym
= new_symbol (dip
, objfile
);
1227 SYMBOL_TYPE (sym
) = type
;
1228 if (cu_language
== language_cplus
)
1230 synthesize_typedef (dip
, objfile
, type
);
1240 decode_array_element_type -- decode type of the array elements
1244 static struct type *decode_array_element_type (char *scan, char *end)
1248 As the last step in decoding the array subscript information for an
1249 array DIE, we need to decode the type of the array elements. We are
1250 passed a pointer to this last part of the subscript information and
1251 must return the appropriate type. If the type attribute is not
1252 recognized, just warn about the problem and return type int.
1255 static struct type
*
1256 decode_array_element_type (scan
)
1261 unsigned short attribute
;
1262 unsigned short fundtype
;
1265 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1267 scan
+= SIZEOF_ATTRIBUTE
;
1268 if ((nbytes
= attribute_size (attribute
)) == -1)
1270 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1271 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1278 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1280 typep
= decode_fund_type (fundtype
);
1282 case AT_mod_fund_type
:
1283 typep
= decode_mod_fund_type (scan
);
1285 case AT_user_def_type
:
1286 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1288 if ((typep
= lookup_utype (die_ref
)) == NULL
)
1290 typep
= alloc_utype (die_ref
, NULL
);
1293 case AT_mod_u_d_type
:
1294 typep
= decode_mod_u_d_type (scan
);
1297 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1298 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1309 decode_subscript_data_item -- decode array subscript item
1313 static struct type *
1314 decode_subscript_data_item (char *scan, char *end)
1318 The array subscripts and the data type of the elements of an
1319 array are described by a list of data items, stored as a block
1320 of contiguous bytes. There is a data item describing each array
1321 dimension, and a final data item describing the element type.
1322 The data items are ordered the same as their appearance in the
1323 source (I.E. leftmost dimension first, next to leftmost second,
1326 The data items describing each array dimension consist of four
1327 parts: (1) a format specifier, (2) type type of the subscript
1328 index, (3) a description of the low bound of the array dimension,
1329 and (4) a description of the high bound of the array dimension.
1331 The last data item is the description of the type of each of
1334 We are passed a pointer to the start of the block of bytes
1335 containing the remaining data items, and a pointer to the first
1336 byte past the data. This function recursively decodes the
1337 remaining data items and returns a type.
1339 If we somehow fail to decode some data, we complain about it
1340 and return a type "array of int".
1343 FIXME: This code only implements the forms currently used
1344 by the AT&T and GNU C compilers.
1346 The end pointer is supplied for error checking, maybe we should
1350 static struct type
*
1351 decode_subscript_data_item (scan
, end
)
1355 struct type
*typep
= NULL
; /* Array type we are building */
1356 struct type
*nexttype
; /* Type of each element (may be array) */
1357 struct type
*indextype
; /* Type of this index */
1358 struct type
*rangetype
;
1359 unsigned int format
;
1360 unsigned short fundtype
;
1361 unsigned long lowbound
;
1362 unsigned long highbound
;
1365 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1367 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1371 typep
= decode_array_element_type (scan
);
1374 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1376 indextype
= decode_fund_type (fundtype
);
1377 scan
+= SIZEOF_FMT_FT
;
1378 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1379 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1381 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1383 nexttype
= decode_subscript_data_item (scan
, end
);
1384 if (nexttype
== NULL
)
1386 /* Munged subscript data or other problem, fake it. */
1387 complain (&subscript_data_items
, DIE_ID
, DIE_NAME
);
1388 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1390 rangetype
= create_range_type ((struct type
*) NULL
, indextype
,
1391 lowbound
, highbound
);
1392 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1401 complain (&unhandled_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1402 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1403 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1404 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1407 complain (&unknown_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1408 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1409 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1410 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1420 dwarf_read_array_type -- read TAG_array_type DIE
1424 static void dwarf_read_array_type (struct dieinfo *dip)
1428 Extract all information from a TAG_array_type DIE and add to
1429 the user defined type vector.
1433 dwarf_read_array_type (dip
)
1434 struct dieinfo
*dip
;
1440 unsigned short blocksz
;
1443 if (dip
-> at_ordering
!= ORD_row_major
)
1445 /* FIXME: Can gdb even handle column major arrays? */
1446 complain (¬_row_major
, DIE_ID
, DIE_NAME
);
1448 if ((sub
= dip
-> at_subscr_data
) != NULL
)
1450 nbytes
= attribute_size (AT_subscr_data
);
1451 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1452 subend
= sub
+ nbytes
+ blocksz
;
1454 type
= decode_subscript_data_item (sub
, subend
);
1455 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1457 /* Install user defined type that has not been referenced yet. */
1458 alloc_utype (dip
-> die_ref
, type
);
1460 else if (TYPE_CODE (utype
) == TYPE_CODE_UNDEF
)
1462 /* Ick! A forward ref has already generated a blank type in our
1463 slot, and this type probably already has things pointing to it
1464 (which is what caused it to be created in the first place).
1465 If it's just a place holder we can plop our fully defined type
1466 on top of it. We can't recover the space allocated for our
1467 new type since it might be on an obstack, but we could reuse
1468 it if we kept a list of them, but it might not be worth it
1474 /* Double ick! Not only is a type already in our slot, but
1475 someone has decorated it. Complain and leave it alone. */
1476 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1485 read_tag_pointer_type -- read TAG_pointer_type DIE
1489 static void read_tag_pointer_type (struct dieinfo *dip)
1493 Extract all information from a TAG_pointer_type DIE and add to
1494 the user defined type vector.
1498 read_tag_pointer_type (dip
)
1499 struct dieinfo
*dip
;
1504 type
= decode_die_type (dip
);
1505 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1507 utype
= lookup_pointer_type (type
);
1508 alloc_utype (dip
-> die_ref
, utype
);
1512 TYPE_TARGET_TYPE (utype
) = type
;
1513 TYPE_POINTER_TYPE (type
) = utype
;
1515 /* We assume the machine has only one representation for pointers! */
1516 /* FIXME: This confuses host<->target data representations, and is a
1517 poor assumption besides. */
1519 TYPE_LENGTH (utype
) = sizeof (char *);
1520 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1528 read_subroutine_type -- process TAG_subroutine_type dies
1532 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1537 Handle DIES due to C code like:
1540 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1546 The parameter DIES are currently ignored. See if gdb has a way to
1547 include this info in it's type system, and decode them if so. Is
1548 this what the type structure's "arg_types" field is for? (FIXME)
1552 read_subroutine_type (dip
, thisdie
, enddie
)
1553 struct dieinfo
*dip
;
1557 struct type
*type
; /* Type that this function returns */
1558 struct type
*ftype
; /* Function that returns above type */
1560 /* Decode the type that this subroutine returns */
1562 type
= decode_die_type (dip
);
1564 /* Check to see if we already have a partially constructed user
1565 defined type for this DIE, from a forward reference. */
1567 if ((ftype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1569 /* This is the first reference to one of these types. Make
1570 a new one and place it in the user defined types. */
1571 ftype
= lookup_function_type (type
);
1572 alloc_utype (dip
-> die_ref
, ftype
);
1574 else if (TYPE_CODE (ftype
) == TYPE_CODE_UNDEF
)
1576 /* We have an existing partially constructed type, so bash it
1577 into the correct type. */
1578 TYPE_TARGET_TYPE (ftype
) = type
;
1579 TYPE_FUNCTION_TYPE (type
) = ftype
;
1580 TYPE_LENGTH (ftype
) = 1;
1581 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1585 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1593 read_enumeration -- process dies which define an enumeration
1597 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1598 char *enddie, struct objfile *objfile)
1602 Given a pointer to a die which begins an enumeration, process all
1603 the dies that define the members of the enumeration.
1607 Note that we need to call enum_type regardless of whether or not we
1608 have a symbol, since we might have an enum without a tag name (thus
1609 no symbol for the tagname).
1613 read_enumeration (dip
, thisdie
, enddie
, objfile
)
1614 struct dieinfo
*dip
;
1617 struct objfile
*objfile
;
1622 type
= enum_type (dip
, objfile
);
1623 sym
= new_symbol (dip
, objfile
);
1626 SYMBOL_TYPE (sym
) = type
;
1627 if (cu_language
== language_cplus
)
1629 synthesize_typedef (dip
, objfile
, type
);
1638 enum_type -- decode and return a type for an enumeration
1642 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1646 Given a pointer to a die information structure for the die which
1647 starts an enumeration, process all the dies that define the members
1648 of the enumeration and return a type pointer for the enumeration.
1650 At the same time, for each member of the enumeration, create a
1651 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1652 and give it the type of the enumeration itself.
1656 Note that the DWARF specification explicitly mandates that enum
1657 constants occur in reverse order from the source program order,
1658 for "consistency" and because this ordering is easier for many
1659 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1660 Entries). Because gdb wants to see the enum members in program
1661 source order, we have to ensure that the order gets reversed while
1662 we are processing them.
1665 static struct type
*
1666 enum_type (dip
, objfile
)
1667 struct dieinfo
*dip
;
1668 struct objfile
*objfile
;
1672 struct nextfield
*next
;
1675 struct nextfield
*list
= NULL
;
1676 struct nextfield
*new;
1681 unsigned short blocksz
;
1685 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1687 /* No forward references created an empty type, so install one now */
1688 type
= alloc_utype (dip
-> die_ref
, NULL
);
1690 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1691 /* Some compilers try to be helpful by inventing "fake" names for
1692 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1693 Thanks, but no thanks... */
1694 if (dip
-> at_name
!= NULL
1695 && *dip
-> at_name
!= '~'
1696 && *dip
-> at_name
!= '.')
1698 TYPE_NAME (type
) = obconcat (&objfile
-> type_obstack
, "enum",
1699 " ", dip
-> at_name
);
1701 if (dip
-> at_byte_size
!= 0)
1703 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1705 if ((scan
= dip
-> at_element_list
) != NULL
)
1707 if (dip
-> short_element_list
)
1709 nbytes
= attribute_size (AT_short_element_list
);
1713 nbytes
= attribute_size (AT_element_list
);
1715 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1716 listend
= scan
+ nbytes
+ blocksz
;
1718 while (scan
< listend
)
1720 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1723 list
-> field
.type
= NULL
;
1724 list
-> field
.bitsize
= 0;
1725 list
-> field
.bitpos
=
1726 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1728 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1729 list
-> field
.name
= obsavestring (scan
, strlen (scan
),
1730 &objfile
-> type_obstack
);
1731 scan
+= strlen (scan
) + 1;
1733 /* Handcraft a new symbol for this enum member. */
1734 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1735 sizeof (struct symbol
));
1736 memset (sym
, 0, sizeof (struct symbol
));
1737 SYMBOL_NAME (sym
) = create_name (list
-> field
.name
,
1738 &objfile
->symbol_obstack
);
1739 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1740 SYMBOL_CLASS (sym
) = LOC_CONST
;
1741 SYMBOL_TYPE (sym
) = type
;
1742 SYMBOL_VALUE (sym
) = list
-> field
.bitpos
;
1743 add_symbol_to_list (sym
, list_in_scope
);
1745 /* Now create the vector of fields, and record how big it is. This is
1746 where we reverse the order, by pulling the members off the list in
1747 reverse order from how they were inserted. If we have no fields
1748 (this is apparently possible in C++) then skip building a field
1752 TYPE_NFIELDS (type
) = nfields
;
1753 TYPE_FIELDS (type
) = (struct field
*)
1754 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1755 /* Copy the saved-up fields into the field vector. */
1756 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
-> next
)
1758 TYPE_FIELD (type
, n
++) = list
-> field
;
1769 read_func_scope -- process all dies within a function scope
1773 Process all dies within a given function scope. We are passed
1774 a die information structure pointer DIP for the die which
1775 starts the function scope, and pointers into the raw die data
1776 that define the dies within the function scope.
1778 For now, we ignore lexical block scopes within the function.
1779 The problem is that AT&T cc does not define a DWARF lexical
1780 block scope for the function itself, while gcc defines a
1781 lexical block scope for the function. We need to think about
1782 how to handle this difference, or if it is even a problem.
1787 read_func_scope (dip
, thisdie
, enddie
, objfile
)
1788 struct dieinfo
*dip
;
1791 struct objfile
*objfile
;
1793 register struct context_stack
*new;
1795 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1796 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1798 objfile
-> ei
.entry_func_lowpc
= dip
-> at_low_pc
;
1799 objfile
-> ei
.entry_func_highpc
= dip
-> at_high_pc
;
1801 if (STREQ (dip
-> at_name
, "main")) /* FIXME: hardwired name */
1803 objfile
-> ei
.main_func_lowpc
= dip
-> at_low_pc
;
1804 objfile
-> ei
.main_func_highpc
= dip
-> at_high_pc
;
1806 new = push_context (0, dip
-> at_low_pc
);
1807 new -> name
= new_symbol (dip
, objfile
);
1808 list_in_scope
= &local_symbols
;
1809 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1810 new = pop_context ();
1811 /* Make a block for the local symbols within. */
1812 finish_block (new -> name
, &local_symbols
, new -> old_blocks
,
1813 new -> start_addr
, dip
-> at_high_pc
, objfile
);
1814 list_in_scope
= &file_symbols
;
1822 handle_producer -- process the AT_producer attribute
1826 Perform any operations that depend on finding a particular
1827 AT_producer attribute.
1832 handle_producer (producer
)
1836 /* If this compilation unit was compiled with g++ or gcc, then set the
1837 processing_gcc_compilation flag. */
1839 processing_gcc_compilation
=
1840 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
))
1841 /* start-sanitize-chill */
1842 || STREQN (producer
, CHILL_PRODUCER
, strlen (CHILL_PRODUCER
))
1843 /* end-sanitize-chill */
1844 || STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
));
1846 /* Select a demangling style if we can identify the producer and if
1847 the current style is auto. We leave the current style alone if it
1848 is not auto. We also leave the demangling style alone if we find a
1849 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1851 #if 1 /* Works, but is experimental. -fnf */
1852 if (AUTO_DEMANGLING
)
1854 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1856 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1858 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1860 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1862 else if (STREQN (producer
, CFRONT_PRODUCER
, strlen (CFRONT_PRODUCER
)))
1864 set_demangling_style (CFRONT_DEMANGLING_STYLE_STRING
);
1875 read_file_scope -- process all dies within a file scope
1879 Process all dies within a given file scope. We are passed a
1880 pointer to the die information structure for the die which
1881 starts the file scope, and pointers into the raw die data which
1882 mark the range of dies within the file scope.
1884 When the partial symbol table is built, the file offset for the line
1885 number table for each compilation unit is saved in the partial symbol
1886 table entry for that compilation unit. As the symbols for each
1887 compilation unit are read, the line number table is read into memory
1888 and the variable lnbase is set to point to it. Thus all we have to
1889 do is use lnbase to access the line number table for the current
1894 read_file_scope (dip
, thisdie
, enddie
, objfile
)
1895 struct dieinfo
*dip
;
1898 struct objfile
*objfile
;
1900 struct cleanup
*back_to
;
1901 struct symtab
*symtab
;
1903 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1904 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1906 objfile
-> ei
.entry_file_lowpc
= dip
-> at_low_pc
;
1907 objfile
-> ei
.entry_file_highpc
= dip
-> at_high_pc
;
1909 set_cu_language (dip
);
1910 if (dip
-> at_producer
!= NULL
)
1912 handle_producer (dip
-> at_producer
);
1914 numutypes
= (enddie
- thisdie
) / 4;
1915 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1916 back_to
= make_cleanup (free
, utypes
);
1917 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1918 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1919 start_symtab (dip
-> at_name
, dip
-> at_comp_dir
, dip
-> at_low_pc
);
1920 decode_line_numbers (lnbase
);
1921 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1922 symtab
= end_symtab (dip
-> at_high_pc
, 0, 0, objfile
);
1925 symtab
-> language
= cu_language
;
1927 do_cleanups (back_to
);
1936 process_dies -- process a range of DWARF Information Entries
1940 static void process_dies (char *thisdie, char *enddie,
1941 struct objfile *objfile)
1945 Process all DIE's in a specified range. May be (and almost
1946 certainly will be) called recursively.
1950 process_dies (thisdie
, enddie
, objfile
)
1953 struct objfile
*objfile
;
1958 while (thisdie
< enddie
)
1960 basicdieinfo (&di
, thisdie
, objfile
);
1961 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1965 else if (di
.die_tag
== TAG_padding
)
1967 nextdie
= thisdie
+ di
.die_length
;
1971 completedieinfo (&di
, objfile
);
1972 if (di
.at_sibling
!= 0)
1974 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1978 nextdie
= thisdie
+ di
.die_length
;
1982 case TAG_compile_unit
:
1983 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
1985 case TAG_global_subroutine
:
1986 case TAG_subroutine
:
1987 if (di
.has_at_low_pc
)
1989 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
1992 case TAG_lexical_block
:
1993 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
1995 case TAG_class_type
:
1996 case TAG_structure_type
:
1997 case TAG_union_type
:
1998 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
2000 case TAG_enumeration_type
:
2001 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
2003 case TAG_subroutine_type
:
2004 read_subroutine_type (&di
, thisdie
, nextdie
);
2006 case TAG_array_type
:
2007 dwarf_read_array_type (&di
);
2009 case TAG_pointer_type
:
2010 read_tag_pointer_type (&di
);
2013 new_symbol (&di
, objfile
);
2025 decode_line_numbers -- decode a line number table fragment
2029 static void decode_line_numbers (char *tblscan, char *tblend,
2030 long length, long base, long line, long pc)
2034 Translate the DWARF line number information to gdb form.
2036 The ".line" section contains one or more line number tables, one for
2037 each ".line" section from the objects that were linked.
2039 The AT_stmt_list attribute for each TAG_source_file entry in the
2040 ".debug" section contains the offset into the ".line" section for the
2041 start of the table for that file.
2043 The table itself has the following structure:
2045 <table length><base address><source statement entry>
2046 4 bytes 4 bytes 10 bytes
2048 The table length is the total size of the table, including the 4 bytes
2049 for the length information.
2051 The base address is the address of the first instruction generated
2052 for the source file.
2054 Each source statement entry has the following structure:
2056 <line number><statement position><address delta>
2057 4 bytes 2 bytes 4 bytes
2059 The line number is relative to the start of the file, starting with
2062 The statement position either -1 (0xFFFF) or the number of characters
2063 from the beginning of the line to the beginning of the statement.
2065 The address delta is the difference between the base address and
2066 the address of the first instruction for the statement.
2068 Note that we must copy the bytes from the packed table to our local
2069 variables before attempting to use them, to avoid alignment problems
2070 on some machines, particularly RISC processors.
2074 Does gdb expect the line numbers to be sorted? They are now by
2075 chance/luck, but are not required to be. (FIXME)
2077 The line with number 0 is unused, gdb apparently can discover the
2078 span of the last line some other way. How? (FIXME)
2082 decode_line_numbers (linetable
)
2087 unsigned long length
;
2092 if (linetable
!= NULL
)
2094 tblscan
= tblend
= linetable
;
2095 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2097 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2099 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2100 GET_UNSIGNED
, current_objfile
);
2101 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2103 while (tblscan
< tblend
)
2105 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2107 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2108 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2110 tblscan
+= SIZEOF_LINETBL_DELTA
;
2114 record_line (current_subfile
, line
, pc
);
2124 locval -- compute the value of a location attribute
2128 static int locval (char *loc)
2132 Given pointer to a string of bytes that define a location, compute
2133 the location and return the value.
2135 When computing values involving the current value of the frame pointer,
2136 the value zero is used, which results in a value relative to the frame
2137 pointer, rather than the absolute value. This is what GDB wants
2140 When the result is a register number, the global isreg flag is set,
2141 otherwise it is cleared. This is a kludge until we figure out a better
2142 way to handle the problem. Gdb's design does not mesh well with the
2143 DWARF notion of a location computing interpreter, which is a shame
2144 because the flexibility goes unused.
2148 Note that stack[0] is unused except as a default error return.
2149 Note that stack overflow is not yet handled.
2156 unsigned short nbytes
;
2157 unsigned short locsize
;
2158 auto long stack
[64];
2165 nbytes
= attribute_size (AT_location
);
2166 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2168 end
= loc
+ locsize
;
2173 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2176 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2178 loc
+= SIZEOF_LOC_ATOM_CODE
;
2179 switch (loc_atom_code
)
2186 /* push register (number) */
2187 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2188 GET_UNSIGNED
, current_objfile
);
2189 loc
+= loc_value_size
;
2193 /* push value of register (number) */
2194 /* Actually, we compute the value as if register has 0 */
2196 regno
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2198 loc
+= loc_value_size
;
2201 stack
[++stacki
] = 0;
2205 stack
[++stacki
] = 0;
2207 complain (&basereg_not_handled
, DIE_ID
, DIE_NAME
, regno
);
2211 /* push address (relocated address) */
2212 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2213 GET_UNSIGNED
, current_objfile
);
2214 loc
+= loc_value_size
;
2217 /* push constant (number) FIXME: signed or unsigned! */
2218 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2219 GET_SIGNED
, current_objfile
);
2220 loc
+= loc_value_size
;
2223 /* pop, deref and push 2 bytes (as a long) */
2224 complain (&op_deref2
, DIE_ID
, DIE_NAME
, stack
[stacki
]);
2226 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2227 complain (&op_deref4
, DIE_ID
, DIE_NAME
, stack
[stacki
]);
2229 case OP_ADD
: /* pop top 2 items, add, push result */
2230 stack
[stacki
- 1] += stack
[stacki
];
2235 return (stack
[stacki
]);
2242 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2246 static struct symtab *read_ofile_symtab (struct partial_symtab *pst)
2250 When expanding a partial symbol table entry to a full symbol table
2251 entry, this is the function that gets called to read in the symbols
2252 for the compilation unit.
2254 Returns a pointer to the newly constructed symtab (which is now
2255 the new first one on the objfile's symtab list).
2258 static struct symtab
*
2259 read_ofile_symtab (pst
)
2260 struct partial_symtab
*pst
;
2262 struct cleanup
*back_to
;
2263 unsigned long lnsize
;
2266 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2268 abfd
= pst
-> objfile
-> obfd
;
2269 current_objfile
= pst
-> objfile
;
2271 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2272 unit, seek to the location in the file, and read in all the DIE's. */
2275 dbsize
= DBLENGTH (pst
);
2276 dbbase
= xmalloc (dbsize
);
2277 dbroff
= DBROFF(pst
);
2278 foffset
= DBFOFF(pst
) + dbroff
;
2279 base_section_offsets
= pst
->section_offsets
;
2280 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2281 if (bfd_seek (abfd
, foffset
, L_SET
) ||
2282 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
2285 error ("can't read DWARF data");
2287 back_to
= make_cleanup (free
, dbbase
);
2289 /* If there is a line number table associated with this compilation unit
2290 then read the size of this fragment in bytes, from the fragment itself.
2291 Allocate a buffer for the fragment and read it in for future
2297 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2298 (bfd_read ((PTR
) lnsizedata
, sizeof (lnsizedata
), 1, abfd
) !=
2299 sizeof (lnsizedata
)))
2301 error ("can't read DWARF line number table size");
2303 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2304 GET_UNSIGNED
, pst
-> objfile
);
2305 lnbase
= xmalloc (lnsize
);
2306 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2307 (bfd_read (lnbase
, lnsize
, 1, abfd
) != lnsize
))
2310 error ("can't read DWARF line numbers");
2312 make_cleanup (free
, lnbase
);
2315 process_dies (dbbase
, dbbase
+ dbsize
, pst
-> objfile
);
2316 do_cleanups (back_to
);
2317 current_objfile
= NULL
;
2318 return (pst
-> objfile
-> symtabs
);
2325 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2329 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2333 Called once for each partial symbol table entry that needs to be
2334 expanded into a full symbol table entry.
2339 psymtab_to_symtab_1 (pst
)
2340 struct partial_symtab
*pst
;
2343 struct cleanup
*old_chain
;
2349 warning ("psymtab for %s already read in. Shouldn't happen.",
2354 /* Read in all partial symtabs on which this one is dependent */
2355 for (i
= 0; i
< pst
-> number_of_dependencies
; i
++)
2357 if (!pst
-> dependencies
[i
] -> readin
)
2359 /* Inform about additional files that need to be read in. */
2362 fputs_filtered (" ", stdout
);
2364 fputs_filtered ("and ", stdout
);
2366 printf_filtered ("%s...",
2367 pst
-> dependencies
[i
] -> filename
);
2369 fflush (stdout
); /* Flush output */
2371 psymtab_to_symtab_1 (pst
-> dependencies
[i
]);
2374 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2377 old_chain
= make_cleanup (really_free_pendings
, 0);
2378 pst
-> symtab
= read_ofile_symtab (pst
);
2381 printf_filtered ("%d DIE's, sorting...", diecount
);
2385 sort_symtab_syms (pst
-> symtab
);
2386 do_cleanups (old_chain
);
2397 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2401 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2405 This is the DWARF support entry point for building a full symbol
2406 table entry from a partial symbol table entry. We are passed a
2407 pointer to the partial symbol table entry that needs to be expanded.
2412 dwarf_psymtab_to_symtab (pst
)
2413 struct partial_symtab
*pst
;
2420 warning ("psymtab for %s already read in. Shouldn't happen.",
2425 if (DBLENGTH (pst
) || pst
-> number_of_dependencies
)
2427 /* Print the message now, before starting serious work, to avoid
2428 disconcerting pauses. */
2431 printf_filtered ("Reading in symbols for %s...",
2436 psymtab_to_symtab_1 (pst
);
2438 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2439 we need to do an equivalent or is this something peculiar to
2441 Match with global symbols. This only needs to be done once,
2442 after all of the symtabs and dependencies have been read in.
2444 scan_file_globals (pst
-> objfile
);
2447 /* Finish up the verbose info message. */
2450 printf_filtered ("done.\n");
2462 init_psymbol_list -- initialize storage for partial symbols
2466 static void init_psymbol_list (struct objfile *objfile, int total_symbols)
2470 Initializes storage for all of the partial symbols that will be
2471 created by dwarf_build_psymtabs and subsidiaries.
2475 init_psymbol_list (objfile
, total_symbols
)
2476 struct objfile
*objfile
;
2479 /* Free any previously allocated psymbol lists. */
2481 if (objfile
-> global_psymbols
.list
)
2483 mfree (objfile
-> md
, (PTR
)objfile
-> global_psymbols
.list
);
2485 if (objfile
-> static_psymbols
.list
)
2487 mfree (objfile
-> md
, (PTR
)objfile
-> static_psymbols
.list
);
2490 /* Current best guess is that there are approximately a twentieth
2491 of the total symbols (in a debugging file) are global or static
2494 objfile
-> global_psymbols
.size
= total_symbols
/ 10;
2495 objfile
-> static_psymbols
.size
= total_symbols
/ 10;
2496 objfile
-> global_psymbols
.next
=
2497 objfile
-> global_psymbols
.list
= (struct partial_symbol
*)
2498 xmmalloc (objfile
-> md
, objfile
-> global_psymbols
.size
2499 * sizeof (struct partial_symbol
));
2500 objfile
-> static_psymbols
.next
=
2501 objfile
-> static_psymbols
.list
= (struct partial_symbol
*)
2502 xmmalloc (objfile
-> md
, objfile
-> static_psymbols
.size
2503 * sizeof (struct partial_symbol
));
2510 add_enum_psymbol -- add enumeration members to partial symbol table
2514 Given pointer to a DIE that is known to be for an enumeration,
2515 extract the symbolic names of the enumeration members and add
2516 partial symbols for them.
2520 add_enum_psymbol (dip
, objfile
)
2521 struct dieinfo
*dip
;
2522 struct objfile
*objfile
;
2526 unsigned short blocksz
;
2529 if ((scan
= dip
-> at_element_list
) != NULL
)
2531 if (dip
-> short_element_list
)
2533 nbytes
= attribute_size (AT_short_element_list
);
2537 nbytes
= attribute_size (AT_element_list
);
2539 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2541 listend
= scan
+ blocksz
;
2542 while (scan
< listend
)
2544 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2545 ADD_PSYMBOL_TO_LIST (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2546 objfile
-> static_psymbols
, 0);
2547 scan
+= strlen (scan
) + 1;
2556 add_partial_symbol -- add symbol to partial symbol table
2560 Given a DIE, if it is one of the types that we want to
2561 add to a partial symbol table, finish filling in the die info
2562 and then add a partial symbol table entry for it.
2566 The caller must ensure that the DIE has a valid name attribute.
2570 add_partial_symbol (dip
, objfile
)
2571 struct dieinfo
*dip
;
2572 struct objfile
*objfile
;
2574 switch (dip
-> die_tag
)
2576 case TAG_global_subroutine
:
2577 record_minimal_symbol (dip
-> at_name
, dip
-> at_low_pc
, mst_text
,
2579 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2580 VAR_NAMESPACE
, LOC_BLOCK
,
2581 objfile
-> global_psymbols
,
2584 case TAG_global_variable
:
2585 record_minimal_symbol (dip
-> at_name
, locval (dip
-> at_location
),
2587 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2588 VAR_NAMESPACE
, LOC_STATIC
,
2589 objfile
-> global_psymbols
,
2592 case TAG_subroutine
:
2593 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2594 VAR_NAMESPACE
, LOC_BLOCK
,
2595 objfile
-> static_psymbols
,
2598 case TAG_local_variable
:
2599 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2600 VAR_NAMESPACE
, LOC_STATIC
,
2601 objfile
-> static_psymbols
,
2605 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2606 VAR_NAMESPACE
, LOC_TYPEDEF
,
2607 objfile
-> static_psymbols
,
2610 case TAG_class_type
:
2611 case TAG_structure_type
:
2612 case TAG_union_type
:
2613 case TAG_enumeration_type
:
2614 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2615 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2616 objfile
-> static_psymbols
,
2618 if (cu_language
== language_cplus
)
2620 /* For C++, these implicitly act as typedefs as well. */
2621 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2622 VAR_NAMESPACE
, LOC_TYPEDEF
,
2623 objfile
-> static_psymbols
,
2634 scan_partial_symbols -- scan DIE's within a single compilation unit
2638 Process the DIE's within a single compilation unit, looking for
2639 interesting DIE's that contribute to the partial symbol table entry
2640 for this compilation unit.
2644 There are some DIE's that may appear both at file scope and within
2645 the scope of a function. We are only interested in the ones at file
2646 scope, and the only way to tell them apart is to keep track of the
2647 scope. For example, consider the test case:
2652 for which the relevant DWARF segment has the structure:
2655 0x23 global subrtn sibling 0x9b
2657 fund_type FT_integer
2662 0x23 local var sibling 0x97
2664 fund_type FT_integer
2665 location OP_BASEREG 0xe
2672 0x1d local var sibling 0xb8
2674 fund_type FT_integer
2675 location OP_ADDR 0x800025dc
2680 We want to include the symbol 'i' in the partial symbol table, but
2681 not the symbol 'j'. In essence, we want to skip all the dies within
2682 the scope of a TAG_global_subroutine DIE.
2684 Don't attempt to add anonymous structures or unions since they have
2685 no name. Anonymous enumerations however are processed, because we
2686 want to extract their member names (the check for a tag name is
2689 Also, for variables and subroutines, check that this is the place
2690 where the actual definition occurs, rather than just a reference
2695 scan_partial_symbols (thisdie
, enddie
, objfile
)
2698 struct objfile
*objfile
;
2704 while (thisdie
< enddie
)
2706 basicdieinfo (&di
, thisdie
, objfile
);
2707 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2713 nextdie
= thisdie
+ di
.die_length
;
2714 /* To avoid getting complete die information for every die, we
2715 only do it (below) for the cases we are interested in. */
2718 case TAG_global_subroutine
:
2719 case TAG_subroutine
:
2720 completedieinfo (&di
, objfile
);
2721 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2723 add_partial_symbol (&di
, objfile
);
2724 /* If there is a sibling attribute, adjust the nextdie
2725 pointer to skip the entire scope of the subroutine.
2726 Apply some sanity checking to make sure we don't
2727 overrun or underrun the range of remaining DIE's */
2728 if (di
.at_sibling
!= 0)
2730 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2731 if ((temp
< thisdie
) || (temp
>= enddie
))
2733 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
,
2743 case TAG_global_variable
:
2744 case TAG_local_variable
:
2745 completedieinfo (&di
, objfile
);
2746 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2748 add_partial_symbol (&di
, objfile
);
2752 case TAG_class_type
:
2753 case TAG_structure_type
:
2754 case TAG_union_type
:
2755 completedieinfo (&di
, objfile
);
2758 add_partial_symbol (&di
, objfile
);
2761 case TAG_enumeration_type
:
2762 completedieinfo (&di
, objfile
);
2765 add_partial_symbol (&di
, objfile
);
2767 add_enum_psymbol (&di
, objfile
);
2779 scan_compilation_units -- build a psymtab entry for each compilation
2783 This is the top level dwarf parsing routine for building partial
2786 It scans from the beginning of the DWARF table looking for the first
2787 TAG_compile_unit DIE, and then follows the sibling chain to locate
2788 each additional TAG_compile_unit DIE.
2790 For each TAG_compile_unit DIE it creates a partial symtab structure,
2791 calls a subordinate routine to collect all the compilation unit's
2792 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2793 new partial symtab structure into the partial symbol table. It also
2794 records the appropriate information in the partial symbol table entry
2795 to allow the chunk of DIE's and line number table for this compilation
2796 unit to be located and re-read later, to generate a complete symbol
2797 table entry for the compilation unit.
2799 Thus it effectively partitions up a chunk of DIE's for multiple
2800 compilation units into smaller DIE chunks and line number tables,
2801 and associates them with a partial symbol table entry.
2805 If any compilation unit has no line number table associated with
2806 it for some reason (a missing at_stmt_list attribute, rather than
2807 just one with a value of zero, which is valid) then we ensure that
2808 the recorded file offset is zero so that the routine which later
2809 reads line number table fragments knows that there is no fragment
2819 scan_compilation_units (thisdie
, enddie
, dbfoff
, lnoffset
, objfile
)
2824 struct objfile
*objfile
;
2828 struct partial_symtab
*pst
;
2831 file_ptr curlnoffset
;
2833 while (thisdie
< enddie
)
2835 basicdieinfo (&di
, thisdie
, objfile
);
2836 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2840 else if (di
.die_tag
!= TAG_compile_unit
)
2842 nextdie
= thisdie
+ di
.die_length
;
2846 completedieinfo (&di
, objfile
);
2847 set_cu_language (&di
);
2848 if (di
.at_sibling
!= 0)
2850 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2854 nextdie
= thisdie
+ di
.die_length
;
2856 curoff
= thisdie
- dbbase
;
2857 culength
= nextdie
- thisdie
;
2858 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2860 /* First allocate a new partial symbol table structure */
2862 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2863 di
.at_name
, di
.at_low_pc
,
2864 objfile
-> global_psymbols
.next
,
2865 objfile
-> static_psymbols
.next
);
2867 pst
-> texthigh
= di
.at_high_pc
;
2868 pst
-> read_symtab_private
= (char *)
2869 obstack_alloc (&objfile
-> psymbol_obstack
,
2870 sizeof (struct dwfinfo
));
2871 DBFOFF (pst
) = dbfoff
;
2872 DBROFF (pst
) = curoff
;
2873 DBLENGTH (pst
) = culength
;
2874 LNFOFF (pst
) = curlnoffset
;
2875 pst
-> read_symtab
= dwarf_psymtab_to_symtab
;
2877 /* Now look for partial symbols */
2879 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2881 pst
-> n_global_syms
= objfile
-> global_psymbols
.next
-
2882 (objfile
-> global_psymbols
.list
+ pst
-> globals_offset
);
2883 pst
-> n_static_syms
= objfile
-> static_psymbols
.next
-
2884 (objfile
-> static_psymbols
.list
+ pst
-> statics_offset
);
2885 sort_pst_symbols (pst
);
2886 /* If there is already a psymtab or symtab for a file of this name,
2887 remove it. (If there is a symtab, more drastic things also
2888 happen.) This happens in VxWorks. */
2889 free_named_symtabs (pst
-> filename
);
2899 new_symbol -- make a symbol table entry for a new symbol
2903 static struct symbol *new_symbol (struct dieinfo *dip,
2904 struct objfile *objfile)
2908 Given a pointer to a DWARF information entry, figure out if we need
2909 to make a symbol table entry for it, and if so, create a new entry
2910 and return a pointer to it.
2913 static struct symbol
*
2914 new_symbol (dip
, objfile
)
2915 struct dieinfo
*dip
;
2916 struct objfile
*objfile
;
2918 struct symbol
*sym
= NULL
;
2920 if (dip
-> at_name
!= NULL
)
2922 sym
= (struct symbol
*) obstack_alloc (&objfile
-> symbol_obstack
,
2923 sizeof (struct symbol
));
2924 memset (sym
, 0, sizeof (struct symbol
));
2925 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2926 &objfile
->symbol_obstack
);
2927 /* default assumptions */
2928 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2929 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2930 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2931 switch (dip
-> die_tag
)
2934 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2935 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2937 case TAG_global_subroutine
:
2938 case TAG_subroutine
:
2939 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2940 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2941 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2942 if (dip
-> die_tag
== TAG_global_subroutine
)
2944 add_symbol_to_list (sym
, &global_symbols
);
2948 add_symbol_to_list (sym
, list_in_scope
);
2951 case TAG_global_variable
:
2952 if (dip
-> at_location
!= NULL
)
2954 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2955 add_symbol_to_list (sym
, &global_symbols
);
2956 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2957 SYMBOL_VALUE (sym
) += baseaddr
;
2960 case TAG_local_variable
:
2961 if (dip
-> at_location
!= NULL
)
2963 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2964 add_symbol_to_list (sym
, list_in_scope
);
2967 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2971 SYMBOL_CLASS (sym
) = LOC_LOCAL
;
2975 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2976 SYMBOL_VALUE (sym
) += baseaddr
;
2980 case TAG_formal_parameter
:
2981 if (dip
-> at_location
!= NULL
)
2983 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2985 add_symbol_to_list (sym
, list_in_scope
);
2988 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
2992 SYMBOL_CLASS (sym
) = LOC_ARG
;
2995 case TAG_unspecified_parameters
:
2996 /* From varargs functions; gdb doesn't seem to have any interest in
2997 this information, so just ignore it for now. (FIXME?) */
2999 case TAG_class_type
:
3000 case TAG_structure_type
:
3001 case TAG_union_type
:
3002 case TAG_enumeration_type
:
3003 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3004 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
3005 add_symbol_to_list (sym
, list_in_scope
);
3008 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3009 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3010 add_symbol_to_list (sym
, list_in_scope
);
3013 /* Not a tag we recognize. Hopefully we aren't processing trash
3014 data, but since we must specifically ignore things we don't
3015 recognize, there is nothing else we should do at this point. */
3026 synthesize_typedef -- make a symbol table entry for a "fake" typedef
3030 static void synthesize_typedef (struct dieinfo *dip,
3031 struct objfile *objfile,
3036 Given a pointer to a DWARF information entry, synthesize a typedef
3037 for the name in the DIE, using the specified type.
3039 This is used for C++ class, structs, unions, and enumerations to
3040 set up the tag name as a type.
3045 synthesize_typedef (dip
, objfile
, type
)
3046 struct dieinfo
*dip
;
3047 struct objfile
*objfile
;
3050 struct symbol
*sym
= NULL
;
3052 if (dip
-> at_name
!= NULL
)
3054 sym
= (struct symbol
*)
3055 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symbol
));
3056 memset (sym
, 0, sizeof (struct symbol
));
3057 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
3058 &objfile
->symbol_obstack
);
3059 SYMBOL_TYPE (sym
) = type
;
3060 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3061 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3062 add_symbol_to_list (sym
, list_in_scope
);
3070 decode_mod_fund_type -- decode a modified fundamental type
3074 static struct type *decode_mod_fund_type (char *typedata)
3078 Decode a block of data containing a modified fundamental
3079 type specification. TYPEDATA is a pointer to the block,
3080 which starts with a length containing the size of the rest
3081 of the block. At the end of the block is a fundmental type
3082 code value that gives the fundamental type. Everything
3083 in between are type modifiers.
3085 We simply compute the number of modifiers and call the general
3086 function decode_modified_type to do the actual work.
3089 static struct type
*
3090 decode_mod_fund_type (typedata
)
3093 struct type
*typep
= NULL
;
3094 unsigned short modcount
;
3097 /* Get the total size of the block, exclusive of the size itself */
3099 nbytes
= attribute_size (AT_mod_fund_type
);
3100 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3103 /* Deduct the size of the fundamental type bytes at the end of the block. */
3105 modcount
-= attribute_size (AT_fund_type
);
3107 /* Now do the actual decoding */
3109 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3117 decode_mod_u_d_type -- decode a modified user defined type
3121 static struct type *decode_mod_u_d_type (char *typedata)
3125 Decode a block of data containing a modified user defined
3126 type specification. TYPEDATA is a pointer to the block,
3127 which consists of a two byte length, containing the size
3128 of the rest of the block. At the end of the block is a
3129 four byte value that gives a reference to a user defined type.
3130 Everything in between are type modifiers.
3132 We simply compute the number of modifiers and call the general
3133 function decode_modified_type to do the actual work.
3136 static struct type
*
3137 decode_mod_u_d_type (typedata
)
3140 struct type
*typep
= NULL
;
3141 unsigned short modcount
;
3144 /* Get the total size of the block, exclusive of the size itself */
3146 nbytes
= attribute_size (AT_mod_u_d_type
);
3147 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3150 /* Deduct the size of the reference type bytes at the end of the block. */
3152 modcount
-= attribute_size (AT_user_def_type
);
3154 /* Now do the actual decoding */
3156 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3164 decode_modified_type -- decode modified user or fundamental type
3168 static struct type *decode_modified_type (char *modifiers,
3169 unsigned short modcount, int mtype)
3173 Decode a modified type, either a modified fundamental type or
3174 a modified user defined type. MODIFIERS is a pointer to the
3175 block of bytes that define MODCOUNT modifiers. Immediately
3176 following the last modifier is a short containing the fundamental
3177 type or a long containing the reference to the user defined
3178 type. Which one is determined by MTYPE, which is either
3179 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3180 type we are generating.
3182 We call ourself recursively to generate each modified type,`
3183 until MODCOUNT reaches zero, at which point we have consumed
3184 all the modifiers and generate either the fundamental type or
3185 user defined type. When the recursion unwinds, each modifier
3186 is applied in turn to generate the full modified type.
3190 If we find a modifier that we don't recognize, and it is not one
3191 of those reserved for application specific use, then we issue a
3192 warning and simply ignore the modifier.
3196 We currently ignore MOD_const and MOD_volatile. (FIXME)
3200 static struct type
*
3201 decode_modified_type (modifiers
, modcount
, mtype
)
3203 unsigned int modcount
;
3206 struct type
*typep
= NULL
;
3207 unsigned short fundtype
;
3216 case AT_mod_fund_type
:
3217 nbytes
= attribute_size (AT_fund_type
);
3218 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3220 typep
= decode_fund_type (fundtype
);
3222 case AT_mod_u_d_type
:
3223 nbytes
= attribute_size (AT_user_def_type
);
3224 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3226 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3228 typep
= alloc_utype (die_ref
, NULL
);
3232 complain (&botched_modified_type
, DIE_ID
, DIE_NAME
, mtype
);
3233 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3239 modifier
= *modifiers
++;
3240 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3243 case MOD_pointer_to
:
3244 typep
= lookup_pointer_type (typep
);
3246 case MOD_reference_to
:
3247 typep
= lookup_reference_type (typep
);
3250 complain (&const_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3253 complain (&volatile_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3256 if (!(MOD_lo_user
<= (unsigned char) modifier
3257 && (unsigned char) modifier
<= MOD_hi_user
))
3259 complain (&unknown_type_modifier
, DIE_ID
, DIE_NAME
, modifier
);
3271 decode_fund_type -- translate basic DWARF type to gdb base type
3275 Given an integer that is one of the fundamental DWARF types,
3276 translate it to one of the basic internal gdb types and return
3277 a pointer to the appropriate gdb type (a "struct type *").
3281 For robustness, if we are asked to translate a fundamental
3282 type that we are unprepared to deal with, we return int so
3283 callers can always depend upon a valid type being returned,
3284 and so gdb may at least do something reasonable by default.
3285 If the type is not in the range of those types defined as
3286 application specific types, we also issue a warning.
3289 static struct type
*
3290 decode_fund_type (fundtype
)
3291 unsigned int fundtype
;
3293 struct type
*typep
= NULL
;
3299 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3302 case FT_boolean
: /* Was FT_set in AT&T version */
3303 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3306 case FT_pointer
: /* (void *) */
3307 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3308 typep
= lookup_pointer_type (typep
);
3312 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3315 case FT_signed_char
:
3316 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3319 case FT_unsigned_char
:
3320 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3324 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3327 case FT_signed_short
:
3328 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3331 case FT_unsigned_short
:
3332 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3336 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3339 case FT_signed_integer
:
3340 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3343 case FT_unsigned_integer
:
3344 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3348 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3351 case FT_signed_long
:
3352 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3355 case FT_unsigned_long
:
3356 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3360 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3363 case FT_signed_long_long
:
3364 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3367 case FT_unsigned_long_long
:
3368 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3372 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3375 case FT_dbl_prec_float
:
3376 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3379 case FT_ext_prec_float
:
3380 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3384 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3387 case FT_dbl_prec_complex
:
3388 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3391 case FT_ext_prec_complex
:
3392 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3399 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3400 if (!(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3402 complain (&unexpected_fund_type
, DIE_ID
, DIE_NAME
, fundtype
);
3413 create_name -- allocate a fresh copy of a string on an obstack
3417 Given a pointer to a string and a pointer to an obstack, allocates
3418 a fresh copy of the string on the specified obstack.
3423 create_name (name
, obstackp
)
3425 struct obstack
*obstackp
;
3430 length
= strlen (name
) + 1;
3431 newname
= (char *) obstack_alloc (obstackp
, length
);
3432 strcpy (newname
, name
);
3440 basicdieinfo -- extract the minimal die info from raw die data
3444 void basicdieinfo (char *diep, struct dieinfo *dip,
3445 struct objfile *objfile)
3449 Given a pointer to raw DIE data, and a pointer to an instance of a
3450 die info structure, this function extracts the basic information
3451 from the DIE data required to continue processing this DIE, along
3452 with some bookkeeping information about the DIE.
3454 The information we absolutely must have includes the DIE tag,
3455 and the DIE length. If we need the sibling reference, then we
3456 will have to call completedieinfo() to process all the remaining
3459 Note that since there is no guarantee that the data is properly
3460 aligned in memory for the type of access required (indirection
3461 through anything other than a char pointer), and there is no
3462 guarantee that it is in the same byte order as the gdb host,
3463 we call a function which deals with both alignment and byte
3464 swapping issues. Possibly inefficient, but quite portable.
3466 We also take care of some other basic things at this point, such
3467 as ensuring that the instance of the die info structure starts
3468 out completely zero'd and that curdie is initialized for use
3469 in error reporting if we have a problem with the current die.
3473 All DIE's must have at least a valid length, thus the minimum
3474 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3475 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3476 are forced to be TAG_padding DIES.
3478 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3479 that if a padding DIE is used for alignment and the amount needed is
3480 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3481 enough to align to the next alignment boundry.
3483 We do some basic sanity checking here, such as verifying that the
3484 length of the die would not cause it to overrun the recorded end of
3485 the buffer holding the DIE info. If we find a DIE that is either
3486 too small or too large, we force it's length to zero which should
3487 cause the caller to take appropriate action.
3491 basicdieinfo (dip
, diep
, objfile
)
3492 struct dieinfo
*dip
;
3494 struct objfile
*objfile
;
3497 memset (dip
, 0, sizeof (struct dieinfo
));
3499 dip
-> die_ref
= dbroff
+ (diep
- dbbase
);
3500 dip
-> die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3502 if ((dip
-> die_length
< SIZEOF_DIE_LENGTH
) ||
3503 ((diep
+ dip
-> die_length
) > (dbbase
+ dbsize
)))
3505 complain (&malformed_die
, DIE_ID
, DIE_NAME
, dip
-> die_length
);
3506 dip
-> die_length
= 0;
3508 else if (dip
-> die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3510 dip
-> die_tag
= TAG_padding
;
3514 diep
+= SIZEOF_DIE_LENGTH
;
3515 dip
-> die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3524 completedieinfo -- finish reading the information for a given DIE
3528 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3532 Given a pointer to an already partially initialized die info structure,
3533 scan the raw DIE data and finish filling in the die info structure
3534 from the various attributes found.
3536 Note that since there is no guarantee that the data is properly
3537 aligned in memory for the type of access required (indirection
3538 through anything other than a char pointer), and there is no
3539 guarantee that it is in the same byte order as the gdb host,
3540 we call a function which deals with both alignment and byte
3541 swapping issues. Possibly inefficient, but quite portable.
3545 Each time we are called, we increment the diecount variable, which
3546 keeps an approximate count of the number of dies processed for
3547 each compilation unit. This information is presented to the user
3548 if the info_verbose flag is set.
3553 completedieinfo (dip
, objfile
)
3554 struct dieinfo
*dip
;
3555 struct objfile
*objfile
;
3557 char *diep
; /* Current pointer into raw DIE data */
3558 char *end
; /* Terminate DIE scan here */
3559 unsigned short attr
; /* Current attribute being scanned */
3560 unsigned short form
; /* Form of the attribute */
3561 int nbytes
; /* Size of next field to read */
3565 end
= diep
+ dip
-> die_length
;
3566 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3569 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3570 diep
+= SIZEOF_ATTRIBUTE
;
3571 if ((nbytes
= attribute_size (attr
)) == -1)
3573 complain (&unknown_attribute_length
, DIE_ID
, DIE_NAME
);
3580 dip
-> at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3584 dip
-> at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3588 dip
-> at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3592 dip
-> at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3596 dip
-> at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3598 dip
-> has_at_stmt_list
= 1;
3601 dip
-> at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3603 dip
-> at_low_pc
+= baseaddr
;
3604 dip
-> has_at_low_pc
= 1;
3607 dip
-> at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3609 dip
-> at_high_pc
+= baseaddr
;
3612 dip
-> at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3615 case AT_user_def_type
:
3616 dip
-> at_user_def_type
= target_to_host (diep
, nbytes
,
3617 GET_UNSIGNED
, objfile
);
3620 dip
-> at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3622 dip
-> has_at_byte_size
= 1;
3625 dip
-> at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3629 dip
-> at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3633 dip
-> at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3637 dip
-> at_location
= diep
;
3639 case AT_mod_fund_type
:
3640 dip
-> at_mod_fund_type
= diep
;
3642 case AT_subscr_data
:
3643 dip
-> at_subscr_data
= diep
;
3645 case AT_mod_u_d_type
:
3646 dip
-> at_mod_u_d_type
= diep
;
3648 case AT_element_list
:
3649 dip
-> at_element_list
= diep
;
3650 dip
-> short_element_list
= 0;
3652 case AT_short_element_list
:
3653 dip
-> at_element_list
= diep
;
3654 dip
-> short_element_list
= 1;
3656 case AT_discr_value
:
3657 dip
-> at_discr_value
= diep
;
3659 case AT_string_length
:
3660 dip
-> at_string_length
= diep
;
3663 dip
-> at_name
= diep
;
3666 /* For now, ignore any "hostname:" portion, since gdb doesn't
3667 know how to deal with it. (FIXME). */
3668 dip
-> at_comp_dir
= strrchr (diep
, ':');
3669 if (dip
-> at_comp_dir
!= NULL
)
3671 dip
-> at_comp_dir
++;
3675 dip
-> at_comp_dir
= diep
;
3679 dip
-> at_producer
= diep
;
3681 case AT_start_scope
:
3682 dip
-> at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3685 case AT_stride_size
:
3686 dip
-> at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3690 dip
-> at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3694 dip
-> at_prototyped
= diep
;
3697 /* Found an attribute that we are unprepared to handle. However
3698 it is specifically one of the design goals of DWARF that
3699 consumers should ignore unknown attributes. As long as the
3700 form is one that we recognize (so we know how to skip it),
3701 we can just ignore the unknown attribute. */
3704 form
= FORM_FROM_ATTR (attr
);
3718 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3721 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3724 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3727 diep
+= strlen (diep
) + 1;
3730 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);
3741 target_to_host -- swap in target data to host
3745 target_to_host (char *from, int nbytes, int signextend,
3746 struct objfile *objfile)
3750 Given pointer to data in target format in FROM, a byte count for
3751 the size of the data in NBYTES, a flag indicating whether or not
3752 the data is signed in SIGNEXTEND, and a pointer to the current
3753 objfile in OBJFILE, convert the data to host format and return
3754 the converted value.
3758 FIXME: If we read data that is known to be signed, and expect to
3759 use it as signed data, then we need to explicitly sign extend the
3760 result until the bfd library is able to do this for us.
3764 static unsigned long
3765 target_to_host (from
, nbytes
, signextend
, objfile
)
3768 int signextend
; /* FIXME: Unused */
3769 struct objfile
*objfile
;
3771 unsigned long rtnval
;
3776 rtnval
= bfd_get_64 (objfile
-> obfd
, (bfd_byte
*) from
);
3779 rtnval
= bfd_get_32 (objfile
-> obfd
, (bfd_byte
*) from
);
3782 rtnval
= bfd_get_16 (objfile
-> obfd
, (bfd_byte
*) from
);
3785 rtnval
= bfd_get_8 (objfile
-> obfd
, (bfd_byte
*) from
);
3788 complain (&no_bfd_get_N
, DIE_ID
, DIE_NAME
, nbytes
);
3799 attribute_size -- compute size of data for a DWARF attribute
3803 static int attribute_size (unsigned int attr)
3807 Given a DWARF attribute in ATTR, compute the size of the first
3808 piece of data associated with this attribute and return that
3811 Returns -1 for unrecognized attributes.
3816 attribute_size (attr
)
3819 int nbytes
; /* Size of next data for this attribute */
3820 unsigned short form
; /* Form of the attribute */
3822 form
= FORM_FROM_ATTR (attr
);
3825 case FORM_STRING
: /* A variable length field is next */
3828 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3829 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3832 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3833 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3834 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3837 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3840 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3841 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3844 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);