1 /* DWARF debugging format support for GDB.
2 Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998
3 Free Software Foundation, Inc.
4 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
5 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 FIXME: Do we need to generate dependencies in partial symtabs?
26 (Perhaps we don't need to).
28 FIXME: Resolve minor differences between what information we put in the
29 partial symbol table and what dbxread puts in. For example, we don't yet
30 put enum constants there. And dbxread seems to invent a lot of typedefs
31 we never see. Use the new printpsym command to see the partial symbol table
34 FIXME: Figure out a better way to tell gdb about the name of the function
35 contain the user's entry point (I.E. main())
37 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
38 other things to work on, if you get bored. :-)
47 #include "elf/dwarf.h"
50 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
52 #include "complaints.h"
55 #include "gdb_string.h"
57 /* Some macros to provide DIE info for complaints. */
59 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
60 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
62 /* Complaints that can be issued during DWARF debug info reading. */
64 struct complaint no_bfd_get_N =
66 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object", 0, 0
69 struct complaint malformed_die =
71 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%d bytes)", 0, 0
74 struct complaint bad_die_ref =
76 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit", 0, 0
79 struct complaint unknown_attribute_form =
81 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", 0, 0
84 struct complaint unknown_attribute_length =
86 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes", 0, 0
89 struct complaint unexpected_fund_type =
91 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x", 0, 0
94 struct complaint unknown_type_modifier =
96 "DIE @ 0x%x \"%s\", unknown type modifier %u", 0, 0
99 struct complaint volatile_ignored =
101 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored", 0, 0
104 struct complaint const_ignored =
106 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", 0, 0
109 struct complaint botched_modified_type =
111 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)", 0, 0
114 struct complaint op_deref2 =
116 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%x not handled", 0, 0
119 struct complaint op_deref4 =
121 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%x not handled", 0, 0
124 struct complaint basereg_not_handled =
126 "DIE @ 0x%x \"%s\", BASEREG %d not handled", 0, 0
129 struct complaint dup_user_type_allocation =
131 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation", 0, 0
134 struct complaint dup_user_type_definition =
136 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition", 0, 0
139 struct complaint missing_tag =
141 "DIE @ 0x%x \"%s\", missing class, structure, or union tag", 0, 0
144 struct complaint bad_array_element_type =
146 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", 0, 0
149 struct complaint subscript_data_items =
151 "DIE @ 0x%x \"%s\", can't decode subscript data items", 0, 0
154 struct complaint unhandled_array_subscript_format =
156 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet", 0, 0
159 struct complaint unknown_array_subscript_format =
161 "DIE @ 0x%x \"%s\", unknown array subscript format %x", 0, 0
164 struct complaint not_row_major =
166 "DIE @ 0x%x \"%s\", array not row major; not handled correctly", 0, 0
169 struct complaint missing_at_name =
171 "DIE @ 0x%x, AT_name tag missing", 0, 0
174 typedef unsigned int DIE_REF; /* Reference to a DIE */
177 #define GCC_PRODUCER "GNU C "
180 #ifndef GPLUS_PRODUCER
181 #define GPLUS_PRODUCER "GNU C++ "
185 #define LCC_PRODUCER "NCR C/C++"
188 #ifndef CHILL_PRODUCER
189 #define CHILL_PRODUCER "GNU Chill "
192 /* Provide a default mapping from a DWARF register number to a gdb REGNUM. */
193 #ifndef DWARF_REG_TO_REGNUM
194 #define DWARF_REG_TO_REGNUM(num) (num)
197 /* Flags to target_to_host() that tell whether or not the data object is
198 expected to be signed. Used, for example, when fetching a signed
199 integer in the target environment which is used as a signed integer
200 in the host environment, and the two environments have different sized
201 ints. In this case, *somebody* has to sign extend the smaller sized
204 #define GET_UNSIGNED 0 /* No sign extension required */
205 #define GET_SIGNED 1 /* Sign extension required */
207 /* Defines for things which are specified in the document "DWARF Debugging
208 Information Format" published by UNIX International, Programming Languages
209 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
211 #define SIZEOF_DIE_LENGTH 4
212 #define SIZEOF_DIE_TAG 2
213 #define SIZEOF_ATTRIBUTE 2
214 #define SIZEOF_FORMAT_SPECIFIER 1
215 #define SIZEOF_FMT_FT 2
216 #define SIZEOF_LINETBL_LENGTH 4
217 #define SIZEOF_LINETBL_LINENO 4
218 #define SIZEOF_LINETBL_STMT 2
219 #define SIZEOF_LINETBL_DELTA 4
220 #define SIZEOF_LOC_ATOM_CODE 1
222 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
224 /* Macros that return the sizes of various types of data in the target
227 FIXME: Currently these are just compile time constants (as they are in
228 other parts of gdb as well). They need to be able to get the right size
229 either from the bfd or possibly from the DWARF info. It would be nice if
230 the DWARF producer inserted DIES that describe the fundamental types in
231 the target environment into the DWARF info, similar to the way dbx stabs
232 producers produce information about their fundamental types. */
234 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
235 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
237 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
238 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
239 However, the Issue 2 DWARF specification from AT&T defines it as
240 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
241 For backwards compatibility with the AT&T compiler produced executables
242 we define AT_short_element_list for this variant. */
244 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
246 /* External variables referenced. */
248 extern int info_verbose; /* From main.c; nonzero => verbose */
249 extern char *warning_pre_print; /* From utils.c */
251 /* The DWARF debugging information consists of two major pieces,
252 one is a block of DWARF Information Entries (DIE's) and the other
253 is a line number table. The "struct dieinfo" structure contains
254 the information for a single DIE, the one currently being processed.
256 In order to make it easier to randomly access the attribute fields
257 of the current DIE, which are specifically unordered within the DIE,
258 each DIE is scanned and an instance of the "struct dieinfo"
259 structure is initialized.
261 Initialization is done in two levels. The first, done by basicdieinfo(),
262 just initializes those fields that are vital to deciding whether or not
263 to use this DIE, how to skip past it, etc. The second, done by the
264 function completedieinfo(), fills in the rest of the information.
266 Attributes which have block forms are not interpreted at the time
267 the DIE is scanned, instead we just save pointers to the start
268 of their value fields.
270 Some fields have a flag <name>_p that is set when the value of the
271 field is valid (I.E. we found a matching attribute in the DIE). Since
272 we may want to test for the presence of some attributes in the DIE,
273 such as AT_low_pc, without restricting the values of the field,
274 we need someway to note that we found such an attribute.
282 char *die; /* Pointer to the raw DIE data */
283 unsigned long die_length; /* Length of the raw DIE data */
284 DIE_REF die_ref; /* Offset of this DIE */
285 unsigned short die_tag; /* Tag for this DIE */
286 unsigned long at_padding;
287 unsigned long at_sibling;
290 unsigned short at_fund_type;
291 BLOCK *at_mod_fund_type;
292 unsigned long at_user_def_type;
293 BLOCK *at_mod_u_d_type;
294 unsigned short at_ordering;
295 BLOCK *at_subscr_data;
296 unsigned long at_byte_size;
297 unsigned short at_bit_offset;
298 unsigned long at_bit_size;
299 BLOCK *at_element_list;
300 unsigned long at_stmt_list;
302 CORE_ADDR at_high_pc;
303 unsigned long at_language;
304 unsigned long at_member;
305 unsigned long at_discr;
306 BLOCK *at_discr_value;
307 BLOCK *at_string_length;
310 unsigned long at_start_scope;
311 unsigned long at_stride_size;
312 unsigned long at_src_info;
314 unsigned int has_at_low_pc:1;
315 unsigned int has_at_stmt_list:1;
316 unsigned int has_at_byte_size:1;
317 unsigned int short_element_list:1;
319 /* Kludge to identify register variables */
323 /* Kludge to identify optimized out variables */
325 unsigned int optimized_out;
327 /* Kludge to identify basereg references.
328 Nonzero if we have an offset relative to a basereg. */
332 /* Kludge to identify which base register is it relative to. */
334 unsigned int basereg;
337 static int diecount; /* Approximate count of dies for compilation unit */
338 static struct dieinfo *curdie; /* For warnings and such */
340 static char *dbbase; /* Base pointer to dwarf info */
341 static int dbsize; /* Size of dwarf info in bytes */
342 static int dbroff; /* Relative offset from start of .debug section */
343 static char *lnbase; /* Base pointer to line section */
345 /* This value is added to each symbol value. FIXME: Generalize to
346 the section_offsets structure used by dbxread (once this is done,
347 pass the appropriate section number to end_symtab). */
348 static CORE_ADDR baseaddr; /* Add to each symbol value */
350 /* The section offsets used in the current psymtab or symtab. FIXME,
351 only used to pass one value (baseaddr) at the moment. */
352 static struct section_offsets *base_section_offsets;
354 /* We put a pointer to this structure in the read_symtab_private field
359 /* Always the absolute file offset to the start of the ".debug"
360 section for the file containing the DIE's being accessed. */
362 /* Relative offset from the start of the ".debug" section 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 /* The size of the chunk of DIE's being examined, in bytes. */
372 /* 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 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
381 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
382 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
383 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
385 /* The generic symbol table building routines have separate lists for
386 file scope symbols and all all other scopes (local scopes). So
387 we need to select the right one to pass to add_symbol_to_list().
388 We do it by keeping a pointer to the correct list in list_in_scope.
390 FIXME: The original dwarf code just treated the file scope as the first
391 local scope, and all other local scopes as nested local scopes, and worked
392 fine. Check to see if we really need to distinguish these in buildsym.c */
394 struct pending **list_in_scope = &file_symbols;
396 /* DIES which have user defined types or modified user defined types refer to
397 other DIES for the type information. Thus we need to associate the offset
398 of a DIE for a user defined type with a pointer to the type information.
400 Originally this was done using a simple but expensive algorithm, with an
401 array of unsorted structures, each containing an offset/type-pointer pair.
402 This array was scanned linearly each time a lookup was done. The result
403 was that gdb was spending over half it's startup time munging through this
404 array of pointers looking for a structure that had the right offset member.
406 The second attempt used the same array of structures, but the array was
407 sorted using qsort each time a new offset/type was recorded, and a binary
408 search was used to find the type pointer for a given DIE offset. This was
409 even slower, due to the overhead of sorting the array each time a new
410 offset/type pair was entered.
412 The third attempt uses a fixed size array of type pointers, indexed by a
413 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
414 we can divide any DIE offset by 4 to obtain a unique index into this fixed
415 size array. Since each element is a 4 byte pointer, it takes exactly as
416 much memory to hold this array as to hold the DWARF info for a given
417 compilation unit. But it gets freed as soon as we are done with it.
418 This has worked well in practice, as a reasonable tradeoff between memory
419 consumption and speed, without having to resort to much more complicated
422 static struct type **utypes; /* Pointer to array of user type pointers */
423 static int numutypes; /* Max number of user type pointers */
425 /* Maintain an array of referenced fundamental types for the current
426 compilation unit being read. For DWARF version 1, we have to construct
427 the fundamental types on the fly, since no information about the
428 fundamental types is supplied. Each such fundamental type is created by
429 calling a language dependent routine to create the type, and then a
430 pointer to that type is then placed in the array at the index specified
431 by it's FT_<TYPENAME> value. The array has a fixed size set by the
432 FT_NUM_MEMBERS compile time constant, which is the number of predefined
433 fundamental types gdb knows how to construct. */
435 static struct type *ftypes[FT_NUM_MEMBERS]; /* Fundamental types */
437 /* Record the language for the compilation unit which is currently being
438 processed. We know it once we have seen the TAG_compile_unit DIE,
439 and we need it while processing the DIE's for that compilation unit.
440 It is eventually saved in the symtab structure, but we don't finalize
441 the symtab struct until we have processed all the DIE's for the
442 compilation unit. We also need to get and save a pointer to the
443 language struct for this language, so we can call the language
444 dependent routines for doing things such as creating fundamental
447 static enum language cu_language;
448 static const struct language_defn *cu_language_defn;
450 /* Forward declarations of static functions so we don't have to worry
451 about ordering within this file. */
453 static void free_utypes (PTR);
455 static int attribute_size (unsigned int);
457 static CORE_ADDR target_to_host (char *, int, int, struct objfile *);
459 static void add_enum_psymbol (struct dieinfo *, struct objfile *);
461 static void handle_producer (char *);
464 read_file_scope (struct dieinfo *, char *, char *, struct objfile *);
467 read_func_scope (struct dieinfo *, char *, char *, struct objfile *);
470 read_lexical_block_scope (struct dieinfo *, char *, char *, struct objfile *);
472 static void scan_partial_symbols (char *, char *, struct objfile *);
475 scan_compilation_units (char *, char *, file_ptr, file_ptr, struct objfile *);
477 static void add_partial_symbol (struct dieinfo *, struct objfile *);
479 static void basicdieinfo (struct dieinfo *, char *, struct objfile *);
481 static void completedieinfo (struct dieinfo *, struct objfile *);
483 static void dwarf_psymtab_to_symtab (struct partial_symtab *);
485 static void psymtab_to_symtab_1 (struct partial_symtab *);
487 static void read_ofile_symtab (struct partial_symtab *);
489 static void process_dies (char *, char *, struct objfile *);
492 read_structure_scope (struct dieinfo *, char *, char *, struct objfile *);
494 static struct type *decode_array_element_type (char *);
496 static struct type *decode_subscript_data_item (char *, char *);
498 static void dwarf_read_array_type (struct dieinfo *);
500 static void read_tag_pointer_type (struct dieinfo *dip);
502 static void read_tag_string_type (struct dieinfo *dip);
504 static void read_subroutine_type (struct dieinfo *, char *, char *);
507 read_enumeration (struct dieinfo *, char *, char *, struct objfile *);
509 static struct type *struct_type (struct dieinfo *, char *, char *,
512 static struct type *enum_type (struct dieinfo *, struct objfile *);
514 static void decode_line_numbers (char *);
516 static struct type *decode_die_type (struct dieinfo *);
518 static struct type *decode_mod_fund_type (char *);
520 static struct type *decode_mod_u_d_type (char *);
522 static struct type *decode_modified_type (char *, unsigned int, int);
524 static struct type *decode_fund_type (unsigned int);
526 static char *create_name (char *, struct obstack *);
528 static struct type *lookup_utype (DIE_REF);
530 static struct type *alloc_utype (DIE_REF, struct type *);
532 static struct symbol *new_symbol (struct dieinfo *, struct objfile *);
535 synthesize_typedef (struct dieinfo *, struct objfile *, struct type *);
537 static int locval (struct dieinfo *);
539 static void set_cu_language (struct dieinfo *);
541 static struct type *dwarf_fundamental_type (struct objfile *, int);
548 dwarf_fundamental_type -- lookup or create a fundamental type
553 dwarf_fundamental_type (struct objfile *objfile, int typeid)
557 DWARF version 1 doesn't supply any fundamental type information,
558 so gdb has to construct such types. It has a fixed number of
559 fundamental types that it knows how to construct, which is the
560 union of all types that it knows how to construct for all languages
561 that it knows about. These are enumerated in gdbtypes.h.
563 As an example, assume we find a DIE that references a DWARF
564 fundamental type of FT_integer. We first look in the ftypes
565 array to see if we already have such a type, indexed by the
566 gdb internal value of FT_INTEGER. If so, we simply return a
567 pointer to that type. If not, then we ask an appropriate
568 language dependent routine to create a type FT_INTEGER, using
569 defaults reasonable for the current target machine, and install
570 that type in ftypes for future reference.
574 Pointer to a fundamental type.
579 dwarf_fundamental_type (objfile, typeid)
580 struct objfile *objfile;
583 if (typeid < 0 || typeid >= FT_NUM_MEMBERS)
585 error ("internal error - invalid fundamental type id %d", typeid);
588 /* Look for this particular type in the fundamental type vector. If one is
589 not found, create and install one appropriate for the current language
590 and the current target machine. */
592 if (ftypes[typeid] == NULL)
594 ftypes[typeid] = cu_language_defn->la_fund_type (objfile, typeid);
597 return (ftypes[typeid]);
604 set_cu_language -- set local copy of language for compilation unit
609 set_cu_language (struct dieinfo *dip)
613 Decode the language attribute for a compilation unit DIE and
614 remember what the language was. We use this at various times
615 when processing DIE's for a given compilation unit.
624 set_cu_language (dip)
627 switch (dip->at_language)
631 cu_language = language_c;
633 case LANG_C_PLUS_PLUS:
634 cu_language = language_cplus;
637 cu_language = language_chill;
640 cu_language = language_m2;
644 cu_language = language_fortran;
650 /* We don't know anything special about these yet. */
651 cu_language = language_unknown;
654 /* If no at_language, try to deduce one from the filename */
655 cu_language = deduce_language_from_filename (dip->at_name);
658 cu_language_defn = language_def (cu_language);
665 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
669 void dwarf_build_psymtabs (struct objfile *objfile,
670 int mainline, file_ptr dbfoff, unsigned int dbfsize,
671 file_ptr lnoffset, unsigned int lnsize)
675 This function is called upon to build partial symtabs from files
676 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
678 It is passed a bfd* containing the DIES
679 and line number information, the corresponding filename for that
680 file, a base address for relocating the symbols, a flag indicating
681 whether or not this debugging information is from a "main symbol
682 table" rather than a shared library or dynamically linked file,
683 and file offset/size pairs for the DIE information and line number
693 dwarf_build_psymtabs (objfile, mainline, dbfoff, dbfsize,
695 struct objfile *objfile;
698 unsigned int dbfsize;
702 bfd *abfd = objfile->obfd;
703 struct cleanup *back_to;
705 current_objfile = objfile;
707 dbbase = xmalloc (dbsize);
709 if ((bfd_seek (abfd, dbfoff, SEEK_SET) != 0) ||
710 (bfd_read (dbbase, dbsize, 1, abfd) != dbsize))
713 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd));
715 back_to = make_cleanup (free, dbbase);
717 /* If we are reinitializing, or if we have never loaded syms yet, init.
718 Since we have no idea how many DIES we are looking at, we just guess
719 some arbitrary value. */
721 if (mainline || objfile->global_psymbols.size == 0 ||
722 objfile->static_psymbols.size == 0)
724 init_psymbol_list (objfile, 1024);
727 /* Save the relocation factor where everybody can see it. */
729 base_section_offsets = objfile->section_offsets;
730 baseaddr = ANOFFSET (objfile->section_offsets, 0);
732 /* Follow the compilation unit sibling chain, building a partial symbol
733 table entry for each one. Save enough information about each compilation
734 unit to locate the full DWARF information later. */
736 scan_compilation_units (dbbase, dbbase + dbsize, dbfoff, lnoffset, objfile);
738 do_cleanups (back_to);
739 current_objfile = NULL;
746 read_lexical_block_scope -- process all dies in a lexical block
750 static void read_lexical_block_scope (struct dieinfo *dip,
751 char *thisdie, char *enddie)
755 Process all the DIES contained within a lexical block scope.
756 Start a new scope, process the dies, and then close the scope.
761 read_lexical_block_scope (dip, thisdie, enddie, objfile)
765 struct objfile *objfile;
767 register struct context_stack *new;
769 push_context (0, dip->at_low_pc);
770 process_dies (thisdie + dip->die_length, enddie, objfile);
771 new = pop_context ();
772 if (local_symbols != NULL)
774 finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
775 dip->at_high_pc, objfile);
777 local_symbols = new->locals;
784 lookup_utype -- look up a user defined type from die reference
788 static type *lookup_utype (DIE_REF die_ref)
792 Given a DIE reference, lookup the user defined type associated with
793 that DIE, if it has been registered already. If not registered, then
794 return NULL. Alloc_utype() can be called to register an empty
795 type for this reference, which will be filled in later when the
796 actual referenced DIE is processed.
800 lookup_utype (die_ref)
803 struct type *type = NULL;
806 utypeidx = (die_ref - dbroff) / 4;
807 if ((utypeidx < 0) || (utypeidx >= numutypes))
809 complain (&bad_die_ref, DIE_ID, DIE_NAME);
813 type = *(utypes + utypeidx);
823 alloc_utype -- add a user defined type for die reference
827 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
831 Given a die reference DIE_REF, and a possible pointer to a user
832 defined type UTYPEP, register that this reference has a user
833 defined type and either use the specified type in UTYPEP or
834 make a new empty type that will be filled in later.
836 We should only be called after calling lookup_utype() to verify that
837 there is not currently a type registered for DIE_REF.
841 alloc_utype (die_ref, utypep)
848 utypeidx = (die_ref - dbroff) / 4;
849 typep = utypes + utypeidx;
850 if ((utypeidx < 0) || (utypeidx >= numutypes))
852 utypep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
853 complain (&bad_die_ref, DIE_ID, DIE_NAME);
855 else if (*typep != NULL)
858 complain (&dup_user_type_allocation, DIE_ID, DIE_NAME);
864 utypep = alloc_type (current_objfile);
875 free_utypes -- free the utypes array and reset pointer & count
879 static void free_utypes (PTR dummy)
883 Called via do_cleanups to free the utypes array, reset the pointer to NULL,
884 and set numutypes back to zero. This ensures that the utypes does not get
885 referenced after being freed.
902 decode_die_type -- return a type for a specified die
906 static struct type *decode_die_type (struct dieinfo *dip)
910 Given a pointer to a die information structure DIP, decode the
911 type of the die and return a pointer to the decoded type. All
912 dies without specific types default to type int.
916 decode_die_type (dip)
919 struct type *type = NULL;
921 if (dip->at_fund_type != 0)
923 type = decode_fund_type (dip->at_fund_type);
925 else if (dip->at_mod_fund_type != NULL)
927 type = decode_mod_fund_type (dip->at_mod_fund_type);
929 else if (dip->at_user_def_type)
931 if ((type = lookup_utype (dip->at_user_def_type)) == NULL)
933 type = alloc_utype (dip->at_user_def_type, NULL);
936 else if (dip->at_mod_u_d_type)
938 type = decode_mod_u_d_type (dip->at_mod_u_d_type);
942 type = dwarf_fundamental_type (current_objfile, FT_VOID);
951 struct_type -- compute and return the type for a struct or union
955 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
956 char *enddie, struct objfile *objfile)
960 Given pointer to a die information structure for a die which
961 defines a union or structure (and MUST define one or the other),
962 and pointers to the raw die data that define the range of dies which
963 define the members, compute and return the user defined type for the
968 struct_type (dip, thisdie, enddie, objfile)
972 struct objfile *objfile;
977 struct nextfield *next;
980 struct nextfield *list = NULL;
981 struct nextfield *new;
988 if ((type = lookup_utype (dip->die_ref)) == NULL)
990 /* No forward references created an empty type, so install one now */
991 type = alloc_utype (dip->die_ref, NULL);
993 INIT_CPLUS_SPECIFIC (type);
994 switch (dip->die_tag)
997 TYPE_CODE (type) = TYPE_CODE_CLASS;
999 case TAG_structure_type:
1000 TYPE_CODE (type) = TYPE_CODE_STRUCT;
1002 case TAG_union_type:
1003 TYPE_CODE (type) = TYPE_CODE_UNION;
1006 /* Should never happen */
1007 TYPE_CODE (type) = TYPE_CODE_UNDEF;
1008 complain (&missing_tag, DIE_ID, DIE_NAME);
1011 /* Some compilers try to be helpful by inventing "fake" names for
1012 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1013 Thanks, but no thanks... */
1014 if (dip->at_name != NULL
1015 && *dip->at_name != '~'
1016 && *dip->at_name != '.')
1018 TYPE_TAG_NAME (type) = obconcat (&objfile->type_obstack,
1019 "", "", dip->at_name);
1021 /* Use whatever size is known. Zero is a valid size. We might however
1022 wish to check has_at_byte_size to make sure that some byte size was
1023 given explicitly, but DWARF doesn't specify that explicit sizes of
1024 zero have to present, so complaining about missing sizes should
1025 probably not be the default. */
1026 TYPE_LENGTH (type) = dip->at_byte_size;
1027 thisdie += dip->die_length;
1028 while (thisdie < enddie)
1030 basicdieinfo (&mbr, thisdie, objfile);
1031 completedieinfo (&mbr, objfile);
1032 if (mbr.die_length <= SIZEOF_DIE_LENGTH)
1036 else if (mbr.at_sibling != 0)
1038 nextdie = dbbase + mbr.at_sibling - dbroff;
1042 nextdie = thisdie + mbr.die_length;
1044 switch (mbr.die_tag)
1047 /* Get space to record the next field's data. */
1048 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1051 /* Save the data. */
1053 obsavestring (mbr.at_name, strlen (mbr.at_name),
1054 &objfile->type_obstack);
1055 FIELD_TYPE (list->field) = decode_die_type (&mbr);
1056 FIELD_BITPOS (list->field) = 8 * locval (&mbr);
1057 /* Handle bit fields. */
1058 FIELD_BITSIZE (list->field) = mbr.at_bit_size;
1059 if (BITS_BIG_ENDIAN)
1061 /* For big endian bits, the at_bit_offset gives the
1062 additional bit offset from the MSB of the containing
1063 anonymous object to the MSB of the field. We don't
1064 have to do anything special since we don't need to
1065 know the size of the anonymous object. */
1066 FIELD_BITPOS (list->field) += mbr.at_bit_offset;
1070 /* For little endian bits, we need to have a non-zero
1071 at_bit_size, so that we know we are in fact dealing
1072 with a bitfield. Compute the bit offset to the MSB
1073 of the anonymous object, subtract off the number of
1074 bits from the MSB of the field to the MSB of the
1075 object, and then subtract off the number of bits of
1076 the field itself. The result is the bit offset of
1077 the LSB of the field. */
1078 if (mbr.at_bit_size > 0)
1080 if (mbr.has_at_byte_size)
1082 /* The size of the anonymous object containing
1083 the bit field is explicit, so use the
1084 indicated size (in bytes). */
1085 anonymous_size = mbr.at_byte_size;
1089 /* The size of the anonymous object containing
1090 the bit field matches the size of an object
1091 of the bit field's type. DWARF allows
1092 at_byte_size to be left out in such cases, as
1093 a debug information size optimization. */
1094 anonymous_size = TYPE_LENGTH (list->field.type);
1096 FIELD_BITPOS (list->field) +=
1097 anonymous_size * 8 - mbr.at_bit_offset - mbr.at_bit_size;
1103 process_dies (thisdie, nextdie, objfile);
1108 /* Now create the vector of fields, and record how big it is. We may
1109 not even have any fields, if this DIE was generated due to a reference
1110 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1111 set, which clues gdb in to the fact that it needs to search elsewhere
1112 for the full structure definition. */
1115 TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
1119 TYPE_NFIELDS (type) = nfields;
1120 TYPE_FIELDS (type) = (struct field *)
1121 TYPE_ALLOC (type, sizeof (struct field) * nfields);
1122 /* Copy the saved-up fields into the field vector. */
1123 for (n = nfields; list; list = list->next)
1125 TYPE_FIELD (type, --n) = list->field;
1135 read_structure_scope -- process all dies within struct or union
1139 static void read_structure_scope (struct dieinfo *dip,
1140 char *thisdie, char *enddie, struct objfile *objfile)
1144 Called when we find the DIE that starts a structure or union
1145 scope (definition) to process all dies that define the members
1146 of the structure or union. DIP is a pointer to the die info
1147 struct for the DIE that names the structure or union.
1151 Note that we need to call struct_type regardless of whether or not
1152 the DIE has an at_name attribute, since it might be an anonymous
1153 structure or union. This gets the type entered into our set of
1156 However, if the structure is incomplete (an opaque struct/union)
1157 then suppress creating a symbol table entry for it since gdb only
1158 wants to find the one with the complete definition. Note that if
1159 it is complete, we just call new_symbol, which does it's own
1160 checking about whether the struct/union is anonymous or not (and
1161 suppresses creating a symbol table entry itself).
1166 read_structure_scope (dip, thisdie, enddie, objfile)
1167 struct dieinfo *dip;
1170 struct objfile *objfile;
1175 type = struct_type (dip, thisdie, enddie, objfile);
1176 if (!(TYPE_FLAGS (type) & TYPE_FLAG_STUB))
1178 sym = new_symbol (dip, objfile);
1181 SYMBOL_TYPE (sym) = type;
1182 if (cu_language == language_cplus)
1184 synthesize_typedef (dip, objfile, type);
1194 decode_array_element_type -- decode type of the array elements
1198 static struct type *decode_array_element_type (char *scan, char *end)
1202 As the last step in decoding the array subscript information for an
1203 array DIE, we need to decode the type of the array elements. We are
1204 passed a pointer to this last part of the subscript information and
1205 must return the appropriate type. If the type attribute is not
1206 recognized, just warn about the problem and return type int.
1209 static struct type *
1210 decode_array_element_type (scan)
1215 unsigned short attribute;
1216 unsigned short fundtype;
1219 attribute = target_to_host (scan, SIZEOF_ATTRIBUTE, GET_UNSIGNED,
1221 scan += SIZEOF_ATTRIBUTE;
1222 if ((nbytes = attribute_size (attribute)) == -1)
1224 complain (&bad_array_element_type, DIE_ID, DIE_NAME, attribute);
1225 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1232 fundtype = target_to_host (scan, nbytes, GET_UNSIGNED,
1234 typep = decode_fund_type (fundtype);
1236 case AT_mod_fund_type:
1237 typep = decode_mod_fund_type (scan);
1239 case AT_user_def_type:
1240 die_ref = target_to_host (scan, nbytes, GET_UNSIGNED,
1242 if ((typep = lookup_utype (die_ref)) == NULL)
1244 typep = alloc_utype (die_ref, NULL);
1247 case AT_mod_u_d_type:
1248 typep = decode_mod_u_d_type (scan);
1251 complain (&bad_array_element_type, DIE_ID, DIE_NAME, attribute);
1252 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1263 decode_subscript_data_item -- decode array subscript item
1267 static struct type *
1268 decode_subscript_data_item (char *scan, char *end)
1272 The array subscripts and the data type of the elements of an
1273 array are described by a list of data items, stored as a block
1274 of contiguous bytes. There is a data item describing each array
1275 dimension, and a final data item describing the element type.
1276 The data items are ordered the same as their appearance in the
1277 source (I.E. leftmost dimension first, next to leftmost second,
1280 The data items describing each array dimension consist of four
1281 parts: (1) a format specifier, (2) type type of the subscript
1282 index, (3) a description of the low bound of the array dimension,
1283 and (4) a description of the high bound of the array dimension.
1285 The last data item is the description of the type of each of
1288 We are passed a pointer to the start of the block of bytes
1289 containing the remaining data items, and a pointer to the first
1290 byte past the data. This function recursively decodes the
1291 remaining data items and returns a type.
1293 If we somehow fail to decode some data, we complain about it
1294 and return a type "array of int".
1297 FIXME: This code only implements the forms currently used
1298 by the AT&T and GNU C compilers.
1300 The end pointer is supplied for error checking, maybe we should
1304 static struct type *
1305 decode_subscript_data_item (scan, end)
1309 struct type *typep = NULL; /* Array type we are building */
1310 struct type *nexttype; /* Type of each element (may be array) */
1311 struct type *indextype; /* Type of this index */
1312 struct type *rangetype;
1313 unsigned int format;
1314 unsigned short fundtype;
1315 unsigned long lowbound;
1316 unsigned long highbound;
1319 format = target_to_host (scan, SIZEOF_FORMAT_SPECIFIER, GET_UNSIGNED,
1321 scan += SIZEOF_FORMAT_SPECIFIER;
1325 typep = decode_array_element_type (scan);
1328 fundtype = target_to_host (scan, SIZEOF_FMT_FT, GET_UNSIGNED,
1330 indextype = decode_fund_type (fundtype);
1331 scan += SIZEOF_FMT_FT;
1332 nbytes = TARGET_FT_LONG_SIZE (current_objfile);
1333 lowbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile);
1335 highbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile);
1337 nexttype = decode_subscript_data_item (scan, end);
1338 if (nexttype == NULL)
1340 /* Munged subscript data or other problem, fake it. */
1341 complain (&subscript_data_items, DIE_ID, DIE_NAME);
1342 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1344 rangetype = create_range_type ((struct type *) NULL, indextype,
1345 lowbound, highbound);
1346 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1355 complain (&unhandled_array_subscript_format, DIE_ID, DIE_NAME, format);
1356 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1357 rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0);
1358 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1361 complain (&unknown_array_subscript_format, DIE_ID, DIE_NAME, format);
1362 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1363 rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0);
1364 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1374 dwarf_read_array_type -- read TAG_array_type DIE
1378 static void dwarf_read_array_type (struct dieinfo *dip)
1382 Extract all information from a TAG_array_type DIE and add to
1383 the user defined type vector.
1387 dwarf_read_array_type (dip)
1388 struct dieinfo *dip;
1394 unsigned short blocksz;
1397 if (dip->at_ordering != ORD_row_major)
1399 /* FIXME: Can gdb even handle column major arrays? */
1400 complain (¬_row_major, DIE_ID, DIE_NAME);
1402 if ((sub = dip->at_subscr_data) != NULL)
1404 nbytes = attribute_size (AT_subscr_data);
1405 blocksz = target_to_host (sub, nbytes, GET_UNSIGNED, current_objfile);
1406 subend = sub + nbytes + blocksz;
1408 type = decode_subscript_data_item (sub, subend);
1409 if ((utype = lookup_utype (dip->die_ref)) == NULL)
1411 /* Install user defined type that has not been referenced yet. */
1412 alloc_utype (dip->die_ref, type);
1414 else if (TYPE_CODE (utype) == TYPE_CODE_UNDEF)
1416 /* Ick! A forward ref has already generated a blank type in our
1417 slot, and this type probably already has things pointing to it
1418 (which is what caused it to be created in the first place).
1419 If it's just a place holder we can plop our fully defined type
1420 on top of it. We can't recover the space allocated for our
1421 new type since it might be on an obstack, but we could reuse
1422 it if we kept a list of them, but it might not be worth it
1428 /* Double ick! Not only is a type already in our slot, but
1429 someone has decorated it. Complain and leave it alone. */
1430 complain (&dup_user_type_definition, DIE_ID, DIE_NAME);
1439 read_tag_pointer_type -- read TAG_pointer_type DIE
1443 static void read_tag_pointer_type (struct dieinfo *dip)
1447 Extract all information from a TAG_pointer_type DIE and add to
1448 the user defined type vector.
1452 read_tag_pointer_type (dip)
1453 struct dieinfo *dip;
1458 type = decode_die_type (dip);
1459 if ((utype = lookup_utype (dip->die_ref)) == NULL)
1461 utype = lookup_pointer_type (type);
1462 alloc_utype (dip->die_ref, utype);
1466 TYPE_TARGET_TYPE (utype) = type;
1467 TYPE_POINTER_TYPE (type) = utype;
1469 /* We assume the machine has only one representation for pointers! */
1470 /* FIXME: Possably a poor assumption */
1471 TYPE_LENGTH (utype) = TARGET_PTR_BIT / TARGET_CHAR_BIT;
1472 TYPE_CODE (utype) = TYPE_CODE_PTR;
1480 read_tag_string_type -- read TAG_string_type DIE
1484 static void read_tag_string_type (struct dieinfo *dip)
1488 Extract all information from a TAG_string_type DIE and add to
1489 the user defined type vector. It isn't really a user defined
1490 type, but it behaves like one, with other DIE's using an
1491 AT_user_def_type attribute to reference it.
1495 read_tag_string_type (dip)
1496 struct dieinfo *dip;
1499 struct type *indextype;
1500 struct type *rangetype;
1501 unsigned long lowbound = 0;
1502 unsigned long highbound;
1504 if (dip->has_at_byte_size)
1506 /* A fixed bounds string */
1507 highbound = dip->at_byte_size - 1;
1511 /* A varying length string. Stub for now. (FIXME) */
1514 indextype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1515 rangetype = create_range_type ((struct type *) NULL, indextype, lowbound,
1518 utype = lookup_utype (dip->die_ref);
1521 /* No type defined, go ahead and create a blank one to use. */
1522 utype = alloc_utype (dip->die_ref, (struct type *) NULL);
1526 /* Already a type in our slot due to a forward reference. Make sure it
1527 is a blank one. If not, complain and leave it alone. */
1528 if (TYPE_CODE (utype) != TYPE_CODE_UNDEF)
1530 complain (&dup_user_type_definition, DIE_ID, DIE_NAME);
1535 /* Create the string type using the blank type we either found or created. */
1536 utype = create_string_type (utype, rangetype);
1543 read_subroutine_type -- process TAG_subroutine_type dies
1547 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1552 Handle DIES due to C code like:
1555 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1561 The parameter DIES are currently ignored. See if gdb has a way to
1562 include this info in it's type system, and decode them if so. Is
1563 this what the type structure's "arg_types" field is for? (FIXME)
1567 read_subroutine_type (dip, thisdie, enddie)
1568 struct dieinfo *dip;
1572 struct type *type; /* Type that this function returns */
1573 struct type *ftype; /* Function that returns above type */
1575 /* Decode the type that this subroutine returns */
1577 type = decode_die_type (dip);
1579 /* Check to see if we already have a partially constructed user
1580 defined type for this DIE, from a forward reference. */
1582 if ((ftype = lookup_utype (dip->die_ref)) == NULL)
1584 /* This is the first reference to one of these types. Make
1585 a new one and place it in the user defined types. */
1586 ftype = lookup_function_type (type);
1587 alloc_utype (dip->die_ref, ftype);
1589 else if (TYPE_CODE (ftype) == TYPE_CODE_UNDEF)
1591 /* We have an existing partially constructed type, so bash it
1592 into the correct type. */
1593 TYPE_TARGET_TYPE (ftype) = type;
1594 TYPE_LENGTH (ftype) = 1;
1595 TYPE_CODE (ftype) = TYPE_CODE_FUNC;
1599 complain (&dup_user_type_definition, DIE_ID, DIE_NAME);
1607 read_enumeration -- process dies which define an enumeration
1611 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1612 char *enddie, struct objfile *objfile)
1616 Given a pointer to a die which begins an enumeration, process all
1617 the dies that define the members of the enumeration.
1621 Note that we need to call enum_type regardless of whether or not we
1622 have a symbol, since we might have an enum without a tag name (thus
1623 no symbol for the tagname).
1627 read_enumeration (dip, thisdie, enddie, objfile)
1628 struct dieinfo *dip;
1631 struct objfile *objfile;
1636 type = enum_type (dip, objfile);
1637 sym = new_symbol (dip, objfile);
1640 SYMBOL_TYPE (sym) = type;
1641 if (cu_language == language_cplus)
1643 synthesize_typedef (dip, objfile, type);
1652 enum_type -- decode and return a type for an enumeration
1656 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1660 Given a pointer to a die information structure for the die which
1661 starts an enumeration, process all the dies that define the members
1662 of the enumeration and return a type pointer for the enumeration.
1664 At the same time, for each member of the enumeration, create a
1665 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1666 and give it the type of the enumeration itself.
1670 Note that the DWARF specification explicitly mandates that enum
1671 constants occur in reverse order from the source program order,
1672 for "consistency" and because this ordering is easier for many
1673 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1674 Entries). Because gdb wants to see the enum members in program
1675 source order, we have to ensure that the order gets reversed while
1676 we are processing them.
1679 static struct type *
1680 enum_type (dip, objfile)
1681 struct dieinfo *dip;
1682 struct objfile *objfile;
1687 struct nextfield *next;
1690 struct nextfield *list = NULL;
1691 struct nextfield *new;
1696 unsigned short blocksz;
1699 int unsigned_enum = 1;
1701 if ((type = lookup_utype (dip->die_ref)) == NULL)
1703 /* No forward references created an empty type, so install one now */
1704 type = alloc_utype (dip->die_ref, NULL);
1706 TYPE_CODE (type) = TYPE_CODE_ENUM;
1707 /* Some compilers try to be helpful by inventing "fake" names for
1708 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1709 Thanks, but no thanks... */
1710 if (dip->at_name != NULL
1711 && *dip->at_name != '~'
1712 && *dip->at_name != '.')
1714 TYPE_TAG_NAME (type) = obconcat (&objfile->type_obstack,
1715 "", "", dip->at_name);
1717 if (dip->at_byte_size != 0)
1719 TYPE_LENGTH (type) = dip->at_byte_size;
1721 if ((scan = dip->at_element_list) != NULL)
1723 if (dip->short_element_list)
1725 nbytes = attribute_size (AT_short_element_list);
1729 nbytes = attribute_size (AT_element_list);
1731 blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile);
1732 listend = scan + nbytes + blocksz;
1734 while (scan < listend)
1736 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1739 FIELD_TYPE (list->field) = NULL;
1740 FIELD_BITSIZE (list->field) = 0;
1741 FIELD_BITPOS (list->field) =
1742 target_to_host (scan, TARGET_FT_LONG_SIZE (objfile), GET_SIGNED,
1744 scan += TARGET_FT_LONG_SIZE (objfile);
1745 list->field.name = obsavestring (scan, strlen (scan),
1746 &objfile->type_obstack);
1747 scan += strlen (scan) + 1;
1749 /* Handcraft a new symbol for this enum member. */
1750 sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack,
1751 sizeof (struct symbol));
1752 memset (sym, 0, sizeof (struct symbol));
1753 SYMBOL_NAME (sym) = create_name (list->field.name,
1754 &objfile->symbol_obstack);
1755 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language);
1756 SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
1757 SYMBOL_CLASS (sym) = LOC_CONST;
1758 SYMBOL_TYPE (sym) = type;
1759 SYMBOL_VALUE (sym) = FIELD_BITPOS (list->field);
1760 if (SYMBOL_VALUE (sym) < 0)
1762 add_symbol_to_list (sym, list_in_scope);
1764 /* Now create the vector of fields, and record how big it is. This is
1765 where we reverse the order, by pulling the members off the list in
1766 reverse order from how they were inserted. If we have no fields
1767 (this is apparently possible in C++) then skip building a field
1772 TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED;
1773 TYPE_NFIELDS (type) = nfields;
1774 TYPE_FIELDS (type) = (struct field *)
1775 obstack_alloc (&objfile->symbol_obstack, sizeof (struct field) * nfields);
1776 /* Copy the saved-up fields into the field vector. */
1777 for (n = 0; (n < nfields) && (list != NULL); list = list->next)
1779 TYPE_FIELD (type, n++) = list->field;
1790 read_func_scope -- process all dies within a function scope
1794 Process all dies within a given function scope. We are passed
1795 a die information structure pointer DIP for the die which
1796 starts the function scope, and pointers into the raw die data
1797 that define the dies within the function scope.
1799 For now, we ignore lexical block scopes within the function.
1800 The problem is that AT&T cc does not define a DWARF lexical
1801 block scope for the function itself, while gcc defines a
1802 lexical block scope for the function. We need to think about
1803 how to handle this difference, or if it is even a problem.
1808 read_func_scope (dip, thisdie, enddie, objfile)
1809 struct dieinfo *dip;
1812 struct objfile *objfile;
1814 register struct context_stack *new;
1816 /* AT_name is absent if the function is described with an
1817 AT_abstract_origin tag.
1818 Ignore the function description for now to avoid GDB core dumps.
1819 FIXME: Add code to handle AT_abstract_origin tags properly. */
1820 if (dip->at_name == NULL)
1822 complain (&missing_at_name, DIE_ID);
1826 if (objfile->ei.entry_point >= dip->at_low_pc &&
1827 objfile->ei.entry_point < dip->at_high_pc)
1829 objfile->ei.entry_func_lowpc = dip->at_low_pc;
1830 objfile->ei.entry_func_highpc = dip->at_high_pc;
1832 new = push_context (0, dip->at_low_pc);
1833 new->name = new_symbol (dip, objfile);
1834 list_in_scope = &local_symbols;
1835 process_dies (thisdie + dip->die_length, enddie, objfile);
1836 new = pop_context ();
1837 /* Make a block for the local symbols within. */
1838 finish_block (new->name, &local_symbols, new->old_blocks,
1839 new->start_addr, dip->at_high_pc, objfile);
1840 list_in_scope = &file_symbols;
1848 handle_producer -- process the AT_producer attribute
1852 Perform any operations that depend on finding a particular
1853 AT_producer attribute.
1858 handle_producer (producer)
1862 /* If this compilation unit was compiled with g++ or gcc, then set the
1863 processing_gcc_compilation flag. */
1865 if (STREQN (producer, GCC_PRODUCER, strlen (GCC_PRODUCER)))
1867 char version = producer[strlen (GCC_PRODUCER)];
1868 processing_gcc_compilation = (version == '2' ? 2 : 1);
1872 processing_gcc_compilation =
1873 STREQN (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER))
1874 || STREQN (producer, CHILL_PRODUCER, strlen (CHILL_PRODUCER));
1877 /* Select a demangling style if we can identify the producer and if
1878 the current style is auto. We leave the current style alone if it
1879 is not auto. We also leave the demangling style alone if we find a
1880 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1882 if (AUTO_DEMANGLING)
1884 if (STREQN (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER)))
1886 set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
1888 else if (STREQN (producer, LCC_PRODUCER, strlen (LCC_PRODUCER)))
1890 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING);
1900 read_file_scope -- process all dies within a file scope
1904 Process all dies within a given file scope. We are passed a
1905 pointer to the die information structure for the die which
1906 starts the file scope, and pointers into the raw die data which
1907 mark the range of dies within the file scope.
1909 When the partial symbol table is built, the file offset for the line
1910 number table for each compilation unit is saved in the partial symbol
1911 table entry for that compilation unit. As the symbols for each
1912 compilation unit are read, the line number table is read into memory
1913 and the variable lnbase is set to point to it. Thus all we have to
1914 do is use lnbase to access the line number table for the current
1919 read_file_scope (dip, thisdie, enddie, objfile)
1920 struct dieinfo *dip;
1923 struct objfile *objfile;
1925 struct cleanup *back_to;
1926 struct symtab *symtab;
1928 if (objfile->ei.entry_point >= dip->at_low_pc &&
1929 objfile->ei.entry_point < dip->at_high_pc)
1931 objfile->ei.entry_file_lowpc = dip->at_low_pc;
1932 objfile->ei.entry_file_highpc = dip->at_high_pc;
1934 set_cu_language (dip);
1935 if (dip->at_producer != NULL)
1937 handle_producer (dip->at_producer);
1939 numutypes = (enddie - thisdie) / 4;
1940 utypes = (struct type **) xmalloc (numutypes * sizeof (struct type *));
1941 back_to = make_cleanup (free_utypes, NULL);
1942 memset (utypes, 0, numutypes * sizeof (struct type *));
1943 memset (ftypes, 0, FT_NUM_MEMBERS * sizeof (struct type *));
1944 start_symtab (dip->at_name, dip->at_comp_dir, dip->at_low_pc);
1945 record_debugformat ("DWARF 1");
1946 decode_line_numbers (lnbase);
1947 process_dies (thisdie + dip->die_length, enddie, objfile);
1949 symtab = end_symtab (dip->at_high_pc, objfile, 0);
1952 symtab->language = cu_language;
1954 do_cleanups (back_to);
1961 process_dies -- process a range of DWARF Information Entries
1965 static void process_dies (char *thisdie, char *enddie,
1966 struct objfile *objfile)
1970 Process all DIE's in a specified range. May be (and almost
1971 certainly will be) called recursively.
1975 process_dies (thisdie, enddie, objfile)
1978 struct objfile *objfile;
1983 while (thisdie < enddie)
1985 basicdieinfo (&di, thisdie, objfile);
1986 if (di.die_length < SIZEOF_DIE_LENGTH)
1990 else if (di.die_tag == TAG_padding)
1992 nextdie = thisdie + di.die_length;
1996 completedieinfo (&di, objfile);
1997 if (di.at_sibling != 0)
1999 nextdie = dbbase + di.at_sibling - dbroff;
2003 nextdie = thisdie + di.die_length;
2005 #ifdef SMASH_TEXT_ADDRESS
2006 /* I think that these are always text, not data, addresses. */
2007 SMASH_TEXT_ADDRESS (di.at_low_pc);
2008 SMASH_TEXT_ADDRESS (di.at_high_pc);
2012 case TAG_compile_unit:
2013 /* Skip Tag_compile_unit if we are already inside a compilation
2014 unit, we are unable to handle nested compilation units
2015 properly (FIXME). */
2016 if (current_subfile == NULL)
2017 read_file_scope (&di, thisdie, nextdie, objfile);
2019 nextdie = thisdie + di.die_length;
2021 case TAG_global_subroutine:
2022 case TAG_subroutine:
2023 if (di.has_at_low_pc)
2025 read_func_scope (&di, thisdie, nextdie, objfile);
2028 case TAG_lexical_block:
2029 read_lexical_block_scope (&di, thisdie, nextdie, objfile);
2031 case TAG_class_type:
2032 case TAG_structure_type:
2033 case TAG_union_type:
2034 read_structure_scope (&di, thisdie, nextdie, objfile);
2036 case TAG_enumeration_type:
2037 read_enumeration (&di, thisdie, nextdie, objfile);
2039 case TAG_subroutine_type:
2040 read_subroutine_type (&di, thisdie, nextdie);
2042 case TAG_array_type:
2043 dwarf_read_array_type (&di);
2045 case TAG_pointer_type:
2046 read_tag_pointer_type (&di);
2048 case TAG_string_type:
2049 read_tag_string_type (&di);
2052 new_symbol (&di, objfile);
2064 decode_line_numbers -- decode a line number table fragment
2068 static void decode_line_numbers (char *tblscan, char *tblend,
2069 long length, long base, long line, long pc)
2073 Translate the DWARF line number information to gdb form.
2075 The ".line" section contains one or more line number tables, one for
2076 each ".line" section from the objects that were linked.
2078 The AT_stmt_list attribute for each TAG_source_file entry in the
2079 ".debug" section contains the offset into the ".line" section for the
2080 start of the table for that file.
2082 The table itself has the following structure:
2084 <table length><base address><source statement entry>
2085 4 bytes 4 bytes 10 bytes
2087 The table length is the total size of the table, including the 4 bytes
2088 for the length information.
2090 The base address is the address of the first instruction generated
2091 for the source file.
2093 Each source statement entry has the following structure:
2095 <line number><statement position><address delta>
2096 4 bytes 2 bytes 4 bytes
2098 The line number is relative to the start of the file, starting with
2101 The statement position either -1 (0xFFFF) or the number of characters
2102 from the beginning of the line to the beginning of the statement.
2104 The address delta is the difference between the base address and
2105 the address of the first instruction for the statement.
2107 Note that we must copy the bytes from the packed table to our local
2108 variables before attempting to use them, to avoid alignment problems
2109 on some machines, particularly RISC processors.
2113 Does gdb expect the line numbers to be sorted? They are now by
2114 chance/luck, but are not required to be. (FIXME)
2116 The line with number 0 is unused, gdb apparently can discover the
2117 span of the last line some other way. How? (FIXME)
2121 decode_line_numbers (linetable)
2126 unsigned long length;
2131 if (linetable != NULL)
2133 tblscan = tblend = linetable;
2134 length = target_to_host (tblscan, SIZEOF_LINETBL_LENGTH, GET_UNSIGNED,
2136 tblscan += SIZEOF_LINETBL_LENGTH;
2138 base = target_to_host (tblscan, TARGET_FT_POINTER_SIZE (objfile),
2139 GET_UNSIGNED, current_objfile);
2140 tblscan += TARGET_FT_POINTER_SIZE (objfile);
2142 while (tblscan < tblend)
2144 line = target_to_host (tblscan, SIZEOF_LINETBL_LINENO, GET_UNSIGNED,
2146 tblscan += SIZEOF_LINETBL_LINENO + SIZEOF_LINETBL_STMT;
2147 pc = target_to_host (tblscan, SIZEOF_LINETBL_DELTA, GET_UNSIGNED,
2149 tblscan += SIZEOF_LINETBL_DELTA;
2153 record_line (current_subfile, line, pc);
2163 locval -- compute the value of a location attribute
2167 static int locval (struct dieinfo *dip)
2171 Given pointer to a string of bytes that define a location, compute
2172 the location and return the value.
2173 A location description containing no atoms indicates that the
2174 object is optimized out. The optimized_out flag is set for those,
2175 the return value is meaningless.
2177 When computing values involving the current value of the frame pointer,
2178 the value zero is used, which results in a value relative to the frame
2179 pointer, rather than the absolute value. This is what GDB wants
2182 When the result is a register number, the isreg flag is set, otherwise
2183 it is cleared. This is a kludge until we figure out a better
2184 way to handle the problem. Gdb's design does not mesh well with the
2185 DWARF notion of a location computing interpreter, which is a shame
2186 because the flexibility goes unused.
2190 Note that stack[0] is unused except as a default error return.
2191 Note that stack overflow is not yet handled.
2196 struct dieinfo *dip;
2198 unsigned short nbytes;
2199 unsigned short locsize;
2200 auto long stack[64];
2207 loc = dip->at_location;
2208 nbytes = attribute_size (AT_location);
2209 locsize = target_to_host (loc, nbytes, GET_UNSIGNED, current_objfile);
2211 end = loc + locsize;
2216 dip->optimized_out = 1;
2217 loc_value_size = TARGET_FT_LONG_SIZE (current_objfile);
2220 dip->optimized_out = 0;
2221 loc_atom_code = target_to_host (loc, SIZEOF_LOC_ATOM_CODE, GET_UNSIGNED,
2223 loc += SIZEOF_LOC_ATOM_CODE;
2224 switch (loc_atom_code)
2231 /* push register (number) */
2233 = DWARF_REG_TO_REGNUM (target_to_host (loc, loc_value_size,
2236 loc += loc_value_size;
2240 /* push value of register (number) */
2241 /* Actually, we compute the value as if register has 0, so the
2242 value ends up being the offset from that register. */
2244 dip->basereg = target_to_host (loc, loc_value_size, GET_UNSIGNED,
2246 loc += loc_value_size;
2247 stack[++stacki] = 0;
2250 /* push address (relocated address) */
2251 stack[++stacki] = target_to_host (loc, loc_value_size,
2252 GET_UNSIGNED, current_objfile);
2253 loc += loc_value_size;
2256 /* push constant (number) FIXME: signed or unsigned! */
2257 stack[++stacki] = target_to_host (loc, loc_value_size,
2258 GET_SIGNED, current_objfile);
2259 loc += loc_value_size;
2262 /* pop, deref and push 2 bytes (as a long) */
2263 complain (&op_deref2, DIE_ID, DIE_NAME, stack[stacki]);
2265 case OP_DEREF4: /* pop, deref and push 4 bytes (as a long) */
2266 complain (&op_deref4, DIE_ID, DIE_NAME, stack[stacki]);
2268 case OP_ADD: /* pop top 2 items, add, push result */
2269 stack[stacki - 1] += stack[stacki];
2274 return (stack[stacki]);
2281 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2285 static void read_ofile_symtab (struct partial_symtab *pst)
2289 When expanding a partial symbol table entry to a full symbol table
2290 entry, this is the function that gets called to read in the symbols
2291 for the compilation unit. A pointer to the newly constructed symtab,
2292 which is now the new first one on the objfile's symtab list, is
2293 stashed in the partial symbol table entry.
2297 read_ofile_symtab (pst)
2298 struct partial_symtab *pst;
2300 struct cleanup *back_to;
2301 unsigned long lnsize;
2304 char lnsizedata[SIZEOF_LINETBL_LENGTH];
2306 abfd = pst->objfile->obfd;
2307 current_objfile = pst->objfile;
2309 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2310 unit, seek to the location in the file, and read in all the DIE's. */
2313 dbsize = DBLENGTH (pst);
2314 dbbase = xmalloc (dbsize);
2315 dbroff = DBROFF (pst);
2316 foffset = DBFOFF (pst) + dbroff;
2317 base_section_offsets = pst->section_offsets;
2318 baseaddr = ANOFFSET (pst->section_offsets, 0);
2319 if (bfd_seek (abfd, foffset, SEEK_SET) ||
2320 (bfd_read (dbbase, dbsize, 1, abfd) != dbsize))
2323 error ("can't read DWARF data");
2325 back_to = make_cleanup (free, dbbase);
2327 /* If there is a line number table associated with this compilation unit
2328 then read the size of this fragment in bytes, from the fragment itself.
2329 Allocate a buffer for the fragment and read it in for future
2335 if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) ||
2336 (bfd_read ((PTR) lnsizedata, sizeof (lnsizedata), 1, abfd) !=
2337 sizeof (lnsizedata)))
2339 error ("can't read DWARF line number table size");
2341 lnsize = target_to_host (lnsizedata, SIZEOF_LINETBL_LENGTH,
2342 GET_UNSIGNED, pst->objfile);
2343 lnbase = xmalloc (lnsize);
2344 if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) ||
2345 (bfd_read (lnbase, lnsize, 1, abfd) != lnsize))
2348 error ("can't read DWARF line numbers");
2350 make_cleanup (free, lnbase);
2353 process_dies (dbbase, dbbase + dbsize, pst->objfile);
2354 do_cleanups (back_to);
2355 current_objfile = NULL;
2356 pst->symtab = pst->objfile->symtabs;
2363 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2367 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2371 Called once for each partial symbol table entry that needs to be
2372 expanded into a full symbol table entry.
2377 psymtab_to_symtab_1 (pst)
2378 struct partial_symtab *pst;
2381 struct cleanup *old_chain;
2387 warning ("psymtab for %s already read in. Shouldn't happen.",
2392 /* Read in all partial symtabs on which this one is dependent */
2393 for (i = 0; i < pst->number_of_dependencies; i++)
2395 if (!pst->dependencies[i]->readin)
2397 /* Inform about additional files that need to be read in. */
2400 fputs_filtered (" ", gdb_stdout);
2402 fputs_filtered ("and ", gdb_stdout);
2404 printf_filtered ("%s...",
2405 pst->dependencies[i]->filename);
2407 gdb_flush (gdb_stdout); /* Flush output */
2409 psymtab_to_symtab_1 (pst->dependencies[i]);
2412 if (DBLENGTH (pst)) /* Otherwise it's a dummy */
2415 old_chain = make_cleanup (really_free_pendings, 0);
2416 read_ofile_symtab (pst);
2419 printf_filtered ("%d DIE's, sorting...", diecount);
2421 gdb_flush (gdb_stdout);
2423 sort_symtab_syms (pst->symtab);
2424 do_cleanups (old_chain);
2435 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2439 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2443 This is the DWARF support entry point for building a full symbol
2444 table entry from a partial symbol table entry. We are passed a
2445 pointer to the partial symbol table entry that needs to be expanded.
2450 dwarf_psymtab_to_symtab (pst)
2451 struct partial_symtab *pst;
2458 warning ("psymtab for %s already read in. Shouldn't happen.",
2463 if (DBLENGTH (pst) || pst->number_of_dependencies)
2465 /* Print the message now, before starting serious work, to avoid
2466 disconcerting pauses. */
2469 printf_filtered ("Reading in symbols for %s...",
2471 gdb_flush (gdb_stdout);
2474 psymtab_to_symtab_1 (pst);
2476 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2477 we need to do an equivalent or is this something peculiar to
2479 Match with global symbols. This only needs to be done once,
2480 after all of the symtabs and dependencies have been read in.
2482 scan_file_globals (pst->objfile);
2485 /* Finish up the verbose info message. */
2488 printf_filtered ("done.\n");
2489 gdb_flush (gdb_stdout);
2500 add_enum_psymbol -- add enumeration members to partial symbol table
2504 Given pointer to a DIE that is known to be for an enumeration,
2505 extract the symbolic names of the enumeration members and add
2506 partial symbols for them.
2510 add_enum_psymbol (dip, objfile)
2511 struct dieinfo *dip;
2512 struct objfile *objfile;
2516 unsigned short blocksz;
2519 if ((scan = dip->at_element_list) != NULL)
2521 if (dip->short_element_list)
2523 nbytes = attribute_size (AT_short_element_list);
2527 nbytes = attribute_size (AT_element_list);
2529 blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile);
2531 listend = scan + blocksz;
2532 while (scan < listend)
2534 scan += TARGET_FT_LONG_SIZE (objfile);
2535 add_psymbol_to_list (scan, strlen (scan), VAR_NAMESPACE, LOC_CONST,
2536 &objfile->static_psymbols, 0, 0, cu_language,
2538 scan += strlen (scan) + 1;
2547 add_partial_symbol -- add symbol to partial symbol table
2551 Given a DIE, if it is one of the types that we want to
2552 add to a partial symbol table, finish filling in the die info
2553 and then add a partial symbol table entry for it.
2557 The caller must ensure that the DIE has a valid name attribute.
2561 add_partial_symbol (dip, objfile)
2562 struct dieinfo *dip;
2563 struct objfile *objfile;
2565 switch (dip->die_tag)
2567 case TAG_global_subroutine:
2568 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2569 VAR_NAMESPACE, LOC_BLOCK,
2570 &objfile->global_psymbols,
2571 0, dip->at_low_pc, cu_language, objfile);
2573 case TAG_global_variable:
2574 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2575 VAR_NAMESPACE, LOC_STATIC,
2576 &objfile->global_psymbols,
2577 0, 0, cu_language, objfile);
2579 case TAG_subroutine:
2580 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2581 VAR_NAMESPACE, LOC_BLOCK,
2582 &objfile->static_psymbols,
2583 0, dip->at_low_pc, cu_language, objfile);
2585 case TAG_local_variable:
2586 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2587 VAR_NAMESPACE, LOC_STATIC,
2588 &objfile->static_psymbols,
2589 0, 0, cu_language, objfile);
2592 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2593 VAR_NAMESPACE, LOC_TYPEDEF,
2594 &objfile->static_psymbols,
2595 0, 0, cu_language, objfile);
2597 case TAG_class_type:
2598 case TAG_structure_type:
2599 case TAG_union_type:
2600 case TAG_enumeration_type:
2601 /* Do not add opaque aggregate definitions to the psymtab. */
2602 if (!dip->has_at_byte_size)
2604 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2605 STRUCT_NAMESPACE, LOC_TYPEDEF,
2606 &objfile->static_psymbols,
2607 0, 0, cu_language, objfile);
2608 if (cu_language == language_cplus)
2610 /* For C++, these implicitly act as typedefs as well. */
2611 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2612 VAR_NAMESPACE, LOC_TYPEDEF,
2613 &objfile->static_psymbols,
2614 0, 0, cu_language, objfile);
2624 scan_partial_symbols -- scan DIE's within a single compilation unit
2628 Process the DIE's within a single compilation unit, looking for
2629 interesting DIE's that contribute to the partial symbol table entry
2630 for this compilation unit.
2634 There are some DIE's that may appear both at file scope and within
2635 the scope of a function. We are only interested in the ones at file
2636 scope, and the only way to tell them apart is to keep track of the
2637 scope. For example, consider the test case:
2642 for which the relevant DWARF segment has the structure:
2645 0x23 global subrtn sibling 0x9b
2647 fund_type FT_integer
2652 0x23 local var sibling 0x97
2654 fund_type FT_integer
2655 location OP_BASEREG 0xe
2662 0x1d local var sibling 0xb8
2664 fund_type FT_integer
2665 location OP_ADDR 0x800025dc
2670 We want to include the symbol 'i' in the partial symbol table, but
2671 not the symbol 'j'. In essence, we want to skip all the dies within
2672 the scope of a TAG_global_subroutine DIE.
2674 Don't attempt to add anonymous structures or unions since they have
2675 no name. Anonymous enumerations however are processed, because we
2676 want to extract their member names (the check for a tag name is
2679 Also, for variables and subroutines, check that this is the place
2680 where the actual definition occurs, rather than just a reference
2688 scan_partial_symbols (thisdie, enddie, objfile)
2691 struct objfile *objfile;
2697 while (thisdie < enddie)
2699 basicdieinfo (&di, thisdie, objfile);
2700 if (di.die_length < SIZEOF_DIE_LENGTH)
2706 nextdie = thisdie + di.die_length;
2707 /* To avoid getting complete die information for every die, we
2708 only do it (below) for the cases we are interested in. */
2711 case TAG_global_subroutine:
2712 case TAG_subroutine:
2713 completedieinfo (&di, objfile);
2714 if (di.at_name && (di.has_at_low_pc || di.at_location))
2716 add_partial_symbol (&di, objfile);
2717 /* If there is a sibling attribute, adjust the nextdie
2718 pointer to skip the entire scope of the subroutine.
2719 Apply some sanity checking to make sure we don't
2720 overrun or underrun the range of remaining DIE's */
2721 if (di.at_sibling != 0)
2723 temp = dbbase + di.at_sibling - dbroff;
2724 if ((temp < thisdie) || (temp >= enddie))
2726 complain (&bad_die_ref, DIE_ID, DIE_NAME,
2736 case TAG_global_variable:
2737 case TAG_local_variable:
2738 completedieinfo (&di, objfile);
2739 if (di.at_name && (di.has_at_low_pc || di.at_location))
2741 add_partial_symbol (&di, objfile);
2745 case TAG_class_type:
2746 case TAG_structure_type:
2747 case TAG_union_type:
2748 completedieinfo (&di, objfile);
2751 add_partial_symbol (&di, objfile);
2754 case TAG_enumeration_type:
2755 completedieinfo (&di, objfile);
2758 add_partial_symbol (&di, objfile);
2760 add_enum_psymbol (&di, objfile);
2772 scan_compilation_units -- build a psymtab entry for each compilation
2776 This is the top level dwarf parsing routine for building partial
2779 It scans from the beginning of the DWARF table looking for the first
2780 TAG_compile_unit DIE, and then follows the sibling chain to locate
2781 each additional TAG_compile_unit DIE.
2783 For each TAG_compile_unit DIE it creates a partial symtab structure,
2784 calls a subordinate routine to collect all the compilation unit's
2785 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2786 new partial symtab structure into the partial symbol table. It also
2787 records the appropriate information in the partial symbol table entry
2788 to allow the chunk of DIE's and line number table for this compilation
2789 unit to be located and re-read later, to generate a complete symbol
2790 table entry for the compilation unit.
2792 Thus it effectively partitions up a chunk of DIE's for multiple
2793 compilation units into smaller DIE chunks and line number tables,
2794 and associates them with a partial symbol table entry.
2798 If any compilation unit has no line number table associated with
2799 it for some reason (a missing at_stmt_list attribute, rather than
2800 just one with a value of zero, which is valid) then we ensure that
2801 the recorded file offset is zero so that the routine which later
2802 reads line number table fragments knows that there is no fragment
2812 scan_compilation_units (thisdie, enddie, dbfoff, lnoffset, objfile)
2817 struct objfile *objfile;
2821 struct partial_symtab *pst;
2824 file_ptr curlnoffset;
2826 while (thisdie < enddie)
2828 basicdieinfo (&di, thisdie, objfile);
2829 if (di.die_length < SIZEOF_DIE_LENGTH)
2833 else if (di.die_tag != TAG_compile_unit)
2835 nextdie = thisdie + di.die_length;
2839 completedieinfo (&di, objfile);
2840 set_cu_language (&di);
2841 if (di.at_sibling != 0)
2843 nextdie = dbbase + di.at_sibling - dbroff;
2847 nextdie = thisdie + di.die_length;
2849 curoff = thisdie - dbbase;
2850 culength = nextdie - thisdie;
2851 curlnoffset = di.has_at_stmt_list ? lnoffset + di.at_stmt_list : 0;
2853 /* First allocate a new partial symbol table structure */
2855 pst = start_psymtab_common (objfile, base_section_offsets,
2856 di.at_name, di.at_low_pc,
2857 objfile->global_psymbols.next,
2858 objfile->static_psymbols.next);
2860 pst->texthigh = di.at_high_pc;
2861 pst->read_symtab_private = (char *)
2862 obstack_alloc (&objfile->psymbol_obstack,
2863 sizeof (struct dwfinfo));
2864 DBFOFF (pst) = dbfoff;
2865 DBROFF (pst) = curoff;
2866 DBLENGTH (pst) = culength;
2867 LNFOFF (pst) = curlnoffset;
2868 pst->read_symtab = dwarf_psymtab_to_symtab;
2870 /* Now look for partial symbols */
2872 scan_partial_symbols (thisdie + di.die_length, nextdie, objfile);
2874 pst->n_global_syms = objfile->global_psymbols.next -
2875 (objfile->global_psymbols.list + pst->globals_offset);
2876 pst->n_static_syms = objfile->static_psymbols.next -
2877 (objfile->static_psymbols.list + pst->statics_offset);
2878 sort_pst_symbols (pst);
2879 /* If there is already a psymtab or symtab for a file of this name,
2880 remove it. (If there is a symtab, more drastic things also
2881 happen.) This happens in VxWorks. */
2882 free_named_symtabs (pst->filename);
2892 new_symbol -- make a symbol table entry for a new symbol
2896 static struct symbol *new_symbol (struct dieinfo *dip,
2897 struct objfile *objfile)
2901 Given a pointer to a DWARF information entry, figure out if we need
2902 to make a symbol table entry for it, and if so, create a new entry
2903 and return a pointer to it.
2906 static struct symbol *
2907 new_symbol (dip, objfile)
2908 struct dieinfo *dip;
2909 struct objfile *objfile;
2911 struct symbol *sym = NULL;
2913 if (dip->at_name != NULL)
2915 sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack,
2916 sizeof (struct symbol));
2917 OBJSTAT (objfile, n_syms++);
2918 memset (sym, 0, sizeof (struct symbol));
2919 SYMBOL_NAME (sym) = create_name (dip->at_name,
2920 &objfile->symbol_obstack);
2921 /* default assumptions */
2922 SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
2923 SYMBOL_CLASS (sym) = LOC_STATIC;
2924 SYMBOL_TYPE (sym) = decode_die_type (dip);
2926 /* If this symbol is from a C++ compilation, then attempt to cache the
2927 demangled form for future reference. This is a typical time versus
2928 space tradeoff, that was decided in favor of time because it sped up
2929 C++ symbol lookups by a factor of about 20. */
2931 SYMBOL_LANGUAGE (sym) = cu_language;
2932 SYMBOL_INIT_DEMANGLED_NAME (sym, &objfile->symbol_obstack);
2933 switch (dip->die_tag)
2936 SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc;
2937 SYMBOL_CLASS (sym) = LOC_LABEL;
2939 case TAG_global_subroutine:
2940 case TAG_subroutine:
2941 SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc;
2942 SYMBOL_TYPE (sym) = lookup_function_type (SYMBOL_TYPE (sym));
2943 if (dip->at_prototyped)
2944 TYPE_FLAGS (SYMBOL_TYPE (sym)) |= TYPE_FLAG_PROTOTYPED;
2945 SYMBOL_CLASS (sym) = LOC_BLOCK;
2946 if (dip->die_tag == TAG_global_subroutine)
2948 add_symbol_to_list (sym, &global_symbols);
2952 add_symbol_to_list (sym, list_in_scope);
2955 case TAG_global_variable:
2956 if (dip->at_location != NULL)
2958 SYMBOL_VALUE_ADDRESS (sym) = locval (dip);
2959 add_symbol_to_list (sym, &global_symbols);
2960 SYMBOL_CLASS (sym) = LOC_STATIC;
2961 SYMBOL_VALUE (sym) += baseaddr;
2964 case TAG_local_variable:
2965 if (dip->at_location != NULL)
2967 int loc = locval (dip);
2968 if (dip->optimized_out)
2970 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT;
2972 else if (dip->isreg)
2974 SYMBOL_CLASS (sym) = LOC_REGISTER;
2976 else if (dip->offreg)
2978 SYMBOL_CLASS (sym) = LOC_BASEREG;
2979 SYMBOL_BASEREG (sym) = dip->basereg;
2983 SYMBOL_CLASS (sym) = LOC_STATIC;
2984 SYMBOL_VALUE (sym) += baseaddr;
2986 if (SYMBOL_CLASS (sym) == LOC_STATIC)
2988 /* LOC_STATIC address class MUST use SYMBOL_VALUE_ADDRESS,
2989 which may store to a bigger location than SYMBOL_VALUE. */
2990 SYMBOL_VALUE_ADDRESS (sym) = loc;
2994 SYMBOL_VALUE (sym) = loc;
2996 add_symbol_to_list (sym, list_in_scope);
2999 case TAG_formal_parameter:
3000 if (dip->at_location != NULL)
3002 SYMBOL_VALUE (sym) = locval (dip);
3004 add_symbol_to_list (sym, list_in_scope);
3007 SYMBOL_CLASS (sym) = LOC_REGPARM;
3009 else if (dip->offreg)
3011 SYMBOL_CLASS (sym) = LOC_BASEREG_ARG;
3012 SYMBOL_BASEREG (sym) = dip->basereg;
3016 SYMBOL_CLASS (sym) = LOC_ARG;
3019 case TAG_unspecified_parameters:
3020 /* From varargs functions; gdb doesn't seem to have any interest in
3021 this information, so just ignore it for now. (FIXME?) */
3023 case TAG_class_type:
3024 case TAG_structure_type:
3025 case TAG_union_type:
3026 case TAG_enumeration_type:
3027 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
3028 SYMBOL_NAMESPACE (sym) = STRUCT_NAMESPACE;
3029 add_symbol_to_list (sym, list_in_scope);
3032 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
3033 SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
3034 add_symbol_to_list (sym, list_in_scope);
3037 /* Not a tag we recognize. Hopefully we aren't processing trash
3038 data, but since we must specifically ignore things we don't
3039 recognize, there is nothing else we should do at this point. */
3050 synthesize_typedef -- make a symbol table entry for a "fake" typedef
3054 static void synthesize_typedef (struct dieinfo *dip,
3055 struct objfile *objfile,
3060 Given a pointer to a DWARF information entry, synthesize a typedef
3061 for the name in the DIE, using the specified type.
3063 This is used for C++ class, structs, unions, and enumerations to
3064 set up the tag name as a type.
3069 synthesize_typedef (dip, objfile, type)
3070 struct dieinfo *dip;
3071 struct objfile *objfile;
3074 struct symbol *sym = NULL;
3076 if (dip->at_name != NULL)
3078 sym = (struct symbol *)
3079 obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol));
3080 OBJSTAT (objfile, n_syms++);
3081 memset (sym, 0, sizeof (struct symbol));
3082 SYMBOL_NAME (sym) = create_name (dip->at_name,
3083 &objfile->symbol_obstack);
3084 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language);
3085 SYMBOL_TYPE (sym) = type;
3086 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
3087 SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
3088 add_symbol_to_list (sym, list_in_scope);
3096 decode_mod_fund_type -- decode a modified fundamental type
3100 static struct type *decode_mod_fund_type (char *typedata)
3104 Decode a block of data containing a modified fundamental
3105 type specification. TYPEDATA is a pointer to the block,
3106 which starts with a length containing the size of the rest
3107 of the block. At the end of the block is a fundmental type
3108 code value that gives the fundamental type. Everything
3109 in between are type modifiers.
3111 We simply compute the number of modifiers and call the general
3112 function decode_modified_type to do the actual work.
3115 static struct type *
3116 decode_mod_fund_type (typedata)
3119 struct type *typep = NULL;
3120 unsigned short modcount;
3123 /* Get the total size of the block, exclusive of the size itself */
3125 nbytes = attribute_size (AT_mod_fund_type);
3126 modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile);
3129 /* Deduct the size of the fundamental type bytes at the end of the block. */
3131 modcount -= attribute_size (AT_fund_type);
3133 /* Now do the actual decoding */
3135 typep = decode_modified_type (typedata, modcount, AT_mod_fund_type);
3143 decode_mod_u_d_type -- decode a modified user defined type
3147 static struct type *decode_mod_u_d_type (char *typedata)
3151 Decode a block of data containing a modified user defined
3152 type specification. TYPEDATA is a pointer to the block,
3153 which consists of a two byte length, containing the size
3154 of the rest of the block. At the end of the block is a
3155 four byte value that gives a reference to a user defined type.
3156 Everything in between are type modifiers.
3158 We simply compute the number of modifiers and call the general
3159 function decode_modified_type to do the actual work.
3162 static struct type *
3163 decode_mod_u_d_type (typedata)
3166 struct type *typep = NULL;
3167 unsigned short modcount;
3170 /* Get the total size of the block, exclusive of the size itself */
3172 nbytes = attribute_size (AT_mod_u_d_type);
3173 modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile);
3176 /* Deduct the size of the reference type bytes at the end of the block. */
3178 modcount -= attribute_size (AT_user_def_type);
3180 /* Now do the actual decoding */
3182 typep = decode_modified_type (typedata, modcount, AT_mod_u_d_type);
3190 decode_modified_type -- decode modified user or fundamental type
3194 static struct type *decode_modified_type (char *modifiers,
3195 unsigned short modcount, int mtype)
3199 Decode a modified type, either a modified fundamental type or
3200 a modified user defined type. MODIFIERS is a pointer to the
3201 block of bytes that define MODCOUNT modifiers. Immediately
3202 following the last modifier is a short containing the fundamental
3203 type or a long containing the reference to the user defined
3204 type. Which one is determined by MTYPE, which is either
3205 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3206 type we are generating.
3208 We call ourself recursively to generate each modified type,`
3209 until MODCOUNT reaches zero, at which point we have consumed
3210 all the modifiers and generate either the fundamental type or
3211 user defined type. When the recursion unwinds, each modifier
3212 is applied in turn to generate the full modified type.
3216 If we find a modifier that we don't recognize, and it is not one
3217 of those reserved for application specific use, then we issue a
3218 warning and simply ignore the modifier.
3222 We currently ignore MOD_const and MOD_volatile. (FIXME)
3226 static struct type *
3227 decode_modified_type (modifiers, modcount, mtype)
3229 unsigned int modcount;
3232 struct type *typep = NULL;
3233 unsigned short fundtype;
3242 case AT_mod_fund_type:
3243 nbytes = attribute_size (AT_fund_type);
3244 fundtype = target_to_host (modifiers, nbytes, GET_UNSIGNED,
3246 typep = decode_fund_type (fundtype);
3248 case AT_mod_u_d_type:
3249 nbytes = attribute_size (AT_user_def_type);
3250 die_ref = target_to_host (modifiers, nbytes, GET_UNSIGNED,
3252 if ((typep = lookup_utype (die_ref)) == NULL)
3254 typep = alloc_utype (die_ref, NULL);
3258 complain (&botched_modified_type, DIE_ID, DIE_NAME, mtype);
3259 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3265 modifier = *modifiers++;
3266 typep = decode_modified_type (modifiers, --modcount, mtype);
3269 case MOD_pointer_to:
3270 typep = lookup_pointer_type (typep);
3272 case MOD_reference_to:
3273 typep = lookup_reference_type (typep);
3276 complain (&const_ignored, DIE_ID, DIE_NAME); /* FIXME */
3279 complain (&volatile_ignored, DIE_ID, DIE_NAME); /* FIXME */
3282 if (!(MOD_lo_user <= (unsigned char) modifier
3283 && (unsigned char) modifier <= MOD_hi_user))
3285 complain (&unknown_type_modifier, DIE_ID, DIE_NAME, modifier);
3297 decode_fund_type -- translate basic DWARF type to gdb base type
3301 Given an integer that is one of the fundamental DWARF types,
3302 translate it to one of the basic internal gdb types and return
3303 a pointer to the appropriate gdb type (a "struct type *").
3307 For robustness, if we are asked to translate a fundamental
3308 type that we are unprepared to deal with, we return int so
3309 callers can always depend upon a valid type being returned,
3310 and so gdb may at least do something reasonable by default.
3311 If the type is not in the range of those types defined as
3312 application specific types, we also issue a warning.
3315 static struct type *
3316 decode_fund_type (fundtype)
3317 unsigned int fundtype;
3319 struct type *typep = NULL;
3325 typep = dwarf_fundamental_type (current_objfile, FT_VOID);
3328 case FT_boolean: /* Was FT_set in AT&T version */
3329 typep = dwarf_fundamental_type (current_objfile, FT_BOOLEAN);
3332 case FT_pointer: /* (void *) */
3333 typep = dwarf_fundamental_type (current_objfile, FT_VOID);
3334 typep = lookup_pointer_type (typep);
3338 typep = dwarf_fundamental_type (current_objfile, FT_CHAR);
3341 case FT_signed_char:
3342 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_CHAR);
3345 case FT_unsigned_char:
3346 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_CHAR);
3350 typep = dwarf_fundamental_type (current_objfile, FT_SHORT);
3353 case FT_signed_short:
3354 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_SHORT);
3357 case FT_unsigned_short:
3358 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_SHORT);
3362 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3365 case FT_signed_integer:
3366 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_INTEGER);
3369 case FT_unsigned_integer:
3370 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_INTEGER);
3374 typep = dwarf_fundamental_type (current_objfile, FT_LONG);
3377 case FT_signed_long:
3378 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG);
3381 case FT_unsigned_long:
3382 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG);
3386 typep = dwarf_fundamental_type (current_objfile, FT_LONG_LONG);
3389 case FT_signed_long_long:
3390 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG_LONG);
3393 case FT_unsigned_long_long:
3394 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG_LONG);
3398 typep = dwarf_fundamental_type (current_objfile, FT_FLOAT);
3401 case FT_dbl_prec_float:
3402 typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_FLOAT);
3405 case FT_ext_prec_float:
3406 typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_FLOAT);
3410 typep = dwarf_fundamental_type (current_objfile, FT_COMPLEX);
3413 case FT_dbl_prec_complex:
3414 typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_COMPLEX);
3417 case FT_ext_prec_complex:
3418 typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_COMPLEX);
3425 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3426 if (!(FT_lo_user <= fundtype && fundtype <= FT_hi_user))
3428 complain (&unexpected_fund_type, DIE_ID, DIE_NAME, fundtype);
3439 create_name -- allocate a fresh copy of a string on an obstack
3443 Given a pointer to a string and a pointer to an obstack, allocates
3444 a fresh copy of the string on the specified obstack.
3449 create_name (name, obstackp)
3451 struct obstack *obstackp;
3456 length = strlen (name) + 1;
3457 newname = (char *) obstack_alloc (obstackp, length);
3458 strcpy (newname, name);
3466 basicdieinfo -- extract the minimal die info from raw die data
3470 void basicdieinfo (char *diep, struct dieinfo *dip,
3471 struct objfile *objfile)
3475 Given a pointer to raw DIE data, and a pointer to an instance of a
3476 die info structure, this function extracts the basic information
3477 from the DIE data required to continue processing this DIE, along
3478 with some bookkeeping information about the DIE.
3480 The information we absolutely must have includes the DIE tag,
3481 and the DIE length. If we need the sibling reference, then we
3482 will have to call completedieinfo() to process all the remaining
3485 Note that since there is no guarantee that the data is properly
3486 aligned in memory for the type of access required (indirection
3487 through anything other than a char pointer), and there is no
3488 guarantee that it is in the same byte order as the gdb host,
3489 we call a function which deals with both alignment and byte
3490 swapping issues. Possibly inefficient, but quite portable.
3492 We also take care of some other basic things at this point, such
3493 as ensuring that the instance of the die info structure starts
3494 out completely zero'd and that curdie is initialized for use
3495 in error reporting if we have a problem with the current die.
3499 All DIE's must have at least a valid length, thus the minimum
3500 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3501 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3502 are forced to be TAG_padding DIES.
3504 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3505 that if a padding DIE is used for alignment and the amount needed is
3506 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3507 enough to align to the next alignment boundry.
3509 We do some basic sanity checking here, such as verifying that the
3510 length of the die would not cause it to overrun the recorded end of
3511 the buffer holding the DIE info. If we find a DIE that is either
3512 too small or too large, we force it's length to zero which should
3513 cause the caller to take appropriate action.
3517 basicdieinfo (dip, diep, objfile)
3518 struct dieinfo *dip;
3520 struct objfile *objfile;
3523 memset (dip, 0, sizeof (struct dieinfo));
3525 dip->die_ref = dbroff + (diep - dbbase);
3526 dip->die_length = target_to_host (diep, SIZEOF_DIE_LENGTH, GET_UNSIGNED,
3528 if ((dip->die_length < SIZEOF_DIE_LENGTH) ||
3529 ((diep + dip->die_length) > (dbbase + dbsize)))
3531 complain (&malformed_die, DIE_ID, DIE_NAME, dip->die_length);
3532 dip->die_length = 0;
3534 else if (dip->die_length < (SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG))
3536 dip->die_tag = TAG_padding;
3540 diep += SIZEOF_DIE_LENGTH;
3541 dip->die_tag = target_to_host (diep, SIZEOF_DIE_TAG, GET_UNSIGNED,
3550 completedieinfo -- finish reading the information for a given DIE
3554 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3558 Given a pointer to an already partially initialized die info structure,
3559 scan the raw DIE data and finish filling in the die info structure
3560 from the various attributes found.
3562 Note that since there is no guarantee that the data is properly
3563 aligned in memory for the type of access required (indirection
3564 through anything other than a char pointer), and there is no
3565 guarantee that it is in the same byte order as the gdb host,
3566 we call a function which deals with both alignment and byte
3567 swapping issues. Possibly inefficient, but quite portable.
3571 Each time we are called, we increment the diecount variable, which
3572 keeps an approximate count of the number of dies processed for
3573 each compilation unit. This information is presented to the user
3574 if the info_verbose flag is set.
3579 completedieinfo (dip, objfile)
3580 struct dieinfo *dip;
3581 struct objfile *objfile;
3583 char *diep; /* Current pointer into raw DIE data */
3584 char *end; /* Terminate DIE scan here */
3585 unsigned short attr; /* Current attribute being scanned */
3586 unsigned short form; /* Form of the attribute */
3587 int nbytes; /* Size of next field to read */
3591 end = diep + dip->die_length;
3592 diep += SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG;
3595 attr = target_to_host (diep, SIZEOF_ATTRIBUTE, GET_UNSIGNED, objfile);
3596 diep += SIZEOF_ATTRIBUTE;
3597 if ((nbytes = attribute_size (attr)) == -1)
3599 complain (&unknown_attribute_length, DIE_ID, DIE_NAME);
3606 dip->at_fund_type = target_to_host (diep, nbytes, GET_UNSIGNED,
3610 dip->at_ordering = target_to_host (diep, nbytes, GET_UNSIGNED,
3614 dip->at_bit_offset = target_to_host (diep, nbytes, GET_UNSIGNED,
3618 dip->at_sibling = target_to_host (diep, nbytes, GET_UNSIGNED,
3622 dip->at_stmt_list = target_to_host (diep, nbytes, GET_UNSIGNED,
3624 dip->has_at_stmt_list = 1;
3627 dip->at_low_pc = target_to_host (diep, nbytes, GET_UNSIGNED,
3629 dip->at_low_pc += baseaddr;
3630 dip->has_at_low_pc = 1;
3633 dip->at_high_pc = target_to_host (diep, nbytes, GET_UNSIGNED,
3635 dip->at_high_pc += baseaddr;
3638 dip->at_language = target_to_host (diep, nbytes, GET_UNSIGNED,
3641 case AT_user_def_type:
3642 dip->at_user_def_type = target_to_host (diep, nbytes,
3643 GET_UNSIGNED, objfile);
3646 dip->at_byte_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3648 dip->has_at_byte_size = 1;
3651 dip->at_bit_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3655 dip->at_member = target_to_host (diep, nbytes, GET_UNSIGNED,
3659 dip->at_discr = target_to_host (diep, nbytes, GET_UNSIGNED,
3663 dip->at_location = diep;
3665 case AT_mod_fund_type:
3666 dip->at_mod_fund_type = diep;
3668 case AT_subscr_data:
3669 dip->at_subscr_data = diep;
3671 case AT_mod_u_d_type:
3672 dip->at_mod_u_d_type = diep;
3674 case AT_element_list:
3675 dip->at_element_list = diep;
3676 dip->short_element_list = 0;
3678 case AT_short_element_list:
3679 dip->at_element_list = diep;
3680 dip->short_element_list = 1;
3682 case AT_discr_value:
3683 dip->at_discr_value = diep;
3685 case AT_string_length:
3686 dip->at_string_length = diep;
3689 dip->at_name = diep;
3692 /* For now, ignore any "hostname:" portion, since gdb doesn't
3693 know how to deal with it. (FIXME). */
3694 dip->at_comp_dir = strrchr (diep, ':');
3695 if (dip->at_comp_dir != NULL)
3701 dip->at_comp_dir = diep;
3705 dip->at_producer = diep;
3707 case AT_start_scope:
3708 dip->at_start_scope = target_to_host (diep, nbytes, GET_UNSIGNED,
3711 case AT_stride_size:
3712 dip->at_stride_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3716 dip->at_src_info = target_to_host (diep, nbytes, GET_UNSIGNED,
3720 dip->at_prototyped = diep;
3723 /* Found an attribute that we are unprepared to handle. However
3724 it is specifically one of the design goals of DWARF that
3725 consumers should ignore unknown attributes. As long as the
3726 form is one that we recognize (so we know how to skip it),
3727 we can just ignore the unknown attribute. */
3730 form = FORM_FROM_ATTR (attr);
3744 diep += TARGET_FT_POINTER_SIZE (objfile);
3747 diep += 2 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile);
3750 diep += 4 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile);
3753 diep += strlen (diep) + 1;
3756 complain (&unknown_attribute_form, DIE_ID, DIE_NAME, form);
3767 target_to_host -- swap in target data to host
3771 target_to_host (char *from, int nbytes, int signextend,
3772 struct objfile *objfile)
3776 Given pointer to data in target format in FROM, a byte count for
3777 the size of the data in NBYTES, a flag indicating whether or not
3778 the data is signed in SIGNEXTEND, and a pointer to the current
3779 objfile in OBJFILE, convert the data to host format and return
3780 the converted value.
3784 FIXME: If we read data that is known to be signed, and expect to
3785 use it as signed data, then we need to explicitly sign extend the
3786 result until the bfd library is able to do this for us.
3788 FIXME: Would a 32 bit target ever need an 8 byte result?
3793 target_to_host (from, nbytes, signextend, objfile)
3796 int signextend; /* FIXME: Unused */
3797 struct objfile *objfile;
3804 rtnval = bfd_get_64 (objfile->obfd, (bfd_byte *) from);
3807 rtnval = bfd_get_32 (objfile->obfd, (bfd_byte *) from);
3810 rtnval = bfd_get_16 (objfile->obfd, (bfd_byte *) from);
3813 rtnval = bfd_get_8 (objfile->obfd, (bfd_byte *) from);
3816 complain (&no_bfd_get_N, DIE_ID, DIE_NAME, nbytes);
3827 attribute_size -- compute size of data for a DWARF attribute
3831 static int attribute_size (unsigned int attr)
3835 Given a DWARF attribute in ATTR, compute the size of the first
3836 piece of data associated with this attribute and return that
3839 Returns -1 for unrecognized attributes.
3844 attribute_size (attr)
3847 int nbytes; /* Size of next data for this attribute */
3848 unsigned short form; /* Form of the attribute */
3850 form = FORM_FROM_ATTR (attr);
3853 case FORM_STRING: /* A variable length field is next */
3856 case FORM_DATA2: /* Next 2 byte field is the data itself */
3857 case FORM_BLOCK2: /* Next 2 byte field is a block length */
3860 case FORM_DATA4: /* Next 4 byte field is the data itself */
3861 case FORM_BLOCK4: /* Next 4 byte field is a block length */
3862 case FORM_REF: /* Next 4 byte field is a DIE offset */
3865 case FORM_DATA8: /* Next 8 byte field is the data itself */
3868 case FORM_ADDR: /* Next field size is target sizeof(void *) */
3869 nbytes = TARGET_FT_POINTER_SIZE (objfile);
3872 complain (&unknown_attribute_form, DIE_ID, DIE_NAME, form);