1 /* DWARF debugging format support for GDB.
3 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
6 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
7 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 If you are looking for DWARF-2 support, you are in the wrong file.
27 Go look in dwarf2read.c. This file is for the original DWARF,
28 also known as DWARF-1.
30 DWARF-1 is slowly headed for obsoletion.
32 In gcc HEAD 2003-11-29 16:28:31 UTC, no targets prefer dwarf-1.
34 In gcc 3.3.2, these targets prefer dwarf-1:
36 i[34567]86-sequent-ptx4*
37 i[34567]86-sequent-sysv4*
41 In gcc 3.2.2, these targets prefer dwarf-1:
44 i[34567]86-sequent-ptx4*
45 i[34567]86-sequent-sysv4*
50 In gcc 2.95.3, these targets prefer dwarf-1:
54 i[34567]86-sequent-ptx4*
55 i[34567]86-sequent-sysv4*
57 i[34567]86-*-sco3.2v5*
73 Some non-gcc compilers produce dwarf-1:
75 PR gdb/1179 was from a user with Diab C++ 4.3.
76 Other users have also reported using Diab compilers with dwarf-1.
77 On 2003-06-09 the gdb list received a report from a user
78 with Absoft ProFortran f77 which is dwarf-1.
80 -- chastain 2003-12-01
85 FIXME: Do we need to generate dependencies in partial symtabs?
86 (Perhaps we don't need to).
88 FIXME: Resolve minor differences between what information we put in the
89 partial symbol table and what dbxread puts in. For example, we don't yet
90 put enum constants there. And dbxread seems to invent a lot of typedefs
91 we never see. Use the new printpsym command to see the partial symbol table
94 FIXME: Figure out a better way to tell gdb about the name of the function
95 contain the user's entry point (I.E. main())
97 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
98 other things to work on, if you get bored. :-)
104 #include "gdbtypes.h"
105 #include "objfiles.h"
106 #include "elf/dwarf.h"
107 #include "buildsym.h"
108 #include "demangle.h"
109 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
110 #include "language.h"
111 #include "complaints.h"
114 #include "gdb_string.h"
116 /* Some macros to provide DIE info for complaints. */
118 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
119 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
121 /* Complaints that can be issued during DWARF debug info reading. */
124 bad_die_ref_complaint (int arg1, const char *arg2, int arg3)
126 complaint (&symfile_complaints,
127 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit",
132 unknown_attribute_form_complaint (int arg1, const char *arg2, int arg3)
134 complaint (&symfile_complaints,
135 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", arg1, arg2,
140 dup_user_type_definition_complaint (int arg1, const char *arg2)
142 complaint (&symfile_complaints,
143 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition",
148 bad_array_element_type_complaint (int arg1, const char *arg2, int arg3)
150 complaint (&symfile_complaints,
151 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", arg1,
155 typedef unsigned int DIE_REF; /* Reference to a DIE */
158 #define GCC_PRODUCER "GNU C "
161 #ifndef GPLUS_PRODUCER
162 #define GPLUS_PRODUCER "GNU C++ "
166 #define LCC_PRODUCER "NCR C/C++"
169 /* Flags to target_to_host() that tell whether or not the data object is
170 expected to be signed. Used, for example, when fetching a signed
171 integer in the target environment which is used as a signed integer
172 in the host environment, and the two environments have different sized
173 ints. In this case, *somebody* has to sign extend the smaller sized
176 #define GET_UNSIGNED 0 /* No sign extension required */
177 #define GET_SIGNED 1 /* Sign extension required */
179 /* Defines for things which are specified in the document "DWARF Debugging
180 Information Format" published by UNIX International, Programming Languages
181 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
183 #define SIZEOF_DIE_LENGTH 4
184 #define SIZEOF_DIE_TAG 2
185 #define SIZEOF_ATTRIBUTE 2
186 #define SIZEOF_FORMAT_SPECIFIER 1
187 #define SIZEOF_FMT_FT 2
188 #define SIZEOF_LINETBL_LENGTH 4
189 #define SIZEOF_LINETBL_LINENO 4
190 #define SIZEOF_LINETBL_STMT 2
191 #define SIZEOF_LINETBL_DELTA 4
192 #define SIZEOF_LOC_ATOM_CODE 1
194 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
196 /* Macros that return the sizes of various types of data in the target
199 FIXME: Currently these are just compile time constants (as they are in
200 other parts of gdb as well). They need to be able to get the right size
201 either from the bfd or possibly from the DWARF info. It would be nice if
202 the DWARF producer inserted DIES that describe the fundamental types in
203 the target environment into the DWARF info, similar to the way dbx stabs
204 producers produce information about their fundamental types. */
206 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
207 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
209 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
210 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
211 However, the Issue 2 DWARF specification from AT&T defines it as
212 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
213 For backwards compatibility with the AT&T compiler produced executables
214 we define AT_short_element_list for this variant. */
216 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
218 /* The DWARF debugging information consists of two major pieces,
219 one is a block of DWARF Information Entries (DIE's) and the other
220 is a line number table. The "struct dieinfo" structure contains
221 the information for a single DIE, the one currently being processed.
223 In order to make it easier to randomly access the attribute fields
224 of the current DIE, which are specifically unordered within the DIE,
225 each DIE is scanned and an instance of the "struct dieinfo"
226 structure is initialized.
228 Initialization is done in two levels. The first, done by basicdieinfo(),
229 just initializes those fields that are vital to deciding whether or not
230 to use this DIE, how to skip past it, etc. The second, done by the
231 function completedieinfo(), fills in the rest of the information.
233 Attributes which have block forms are not interpreted at the time
234 the DIE is scanned, instead we just save pointers to the start
235 of their value fields.
237 Some fields have a flag <name>_p that is set when the value of the
238 field is valid (I.E. we found a matching attribute in the DIE). Since
239 we may want to test for the presence of some attributes in the DIE,
240 such as AT_low_pc, without restricting the values of the field,
241 we need someway to note that we found such an attribute.
249 char *die; /* Pointer to the raw DIE data */
250 unsigned long die_length; /* Length of the raw DIE data */
251 DIE_REF die_ref; /* Offset of this DIE */
252 unsigned short die_tag; /* Tag for this DIE */
253 unsigned long at_padding;
254 unsigned long at_sibling;
257 unsigned short at_fund_type;
258 BLOCK *at_mod_fund_type;
259 unsigned long at_user_def_type;
260 BLOCK *at_mod_u_d_type;
261 unsigned short at_ordering;
262 BLOCK *at_subscr_data;
263 unsigned long at_byte_size;
264 unsigned short at_bit_offset;
265 unsigned long at_bit_size;
266 BLOCK *at_element_list;
267 unsigned long at_stmt_list;
269 CORE_ADDR at_high_pc;
270 unsigned long at_language;
271 unsigned long at_member;
272 unsigned long at_discr;
273 BLOCK *at_discr_value;
274 BLOCK *at_string_length;
277 unsigned long at_start_scope;
278 unsigned long at_stride_size;
279 unsigned long at_src_info;
281 unsigned int has_at_low_pc:1;
282 unsigned int has_at_stmt_list:1;
283 unsigned int has_at_byte_size:1;
284 unsigned int short_element_list:1;
286 /* Kludge to identify register variables */
290 /* Kludge to identify optimized out variables */
292 unsigned int optimized_out;
294 /* Kludge to identify basereg references.
295 Nonzero if we have an offset relative to a basereg. */
299 /* Kludge to identify which base register is it relative to. */
301 unsigned int basereg;
304 static int diecount; /* Approximate count of dies for compilation unit */
305 static struct dieinfo *curdie; /* For warnings and such */
307 static char *dbbase; /* Base pointer to dwarf info */
308 static int dbsize; /* Size of dwarf info in bytes */
309 static int dbroff; /* Relative offset from start of .debug section */
310 static char *lnbase; /* Base pointer to line section */
312 /* This value is added to each symbol value. FIXME: Generalize to
313 the section_offsets structure used by dbxread (once this is done,
314 pass the appropriate section number to end_symtab). */
315 static CORE_ADDR baseaddr; /* Add to each symbol value */
317 /* The section offsets used in the current psymtab or symtab. FIXME,
318 only used to pass one value (baseaddr) at the moment. */
319 static struct section_offsets *base_section_offsets;
321 /* We put a pointer to this structure in the read_symtab_private field
326 /* Always the absolute file offset to the start of the ".debug"
327 section for the file containing the DIE's being accessed. */
329 /* Relative offset from the start of the ".debug" section to the
330 first DIE to be accessed. When building the partial symbol
331 table, this value will be zero since we are accessing the
332 entire ".debug" section. When expanding a partial symbol
333 table entry, this value will be the offset to the first
334 DIE for the compilation unit containing the symbol that
335 triggers the expansion. */
337 /* The size of the chunk of DIE's being examined, in bytes. */
339 /* The absolute file offset to the line table fragment. Ignored
340 when building partial symbol tables, but used when expanding
341 them, and contains the absolute file offset to the fragment
342 of the ".line" section containing the line numbers for the
343 current compilation unit. */
347 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
348 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
349 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
350 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
352 /* The generic symbol table building routines have separate lists for
353 file scope symbols and all all other scopes (local scopes). So
354 we need to select the right one to pass to add_symbol_to_list().
355 We do it by keeping a pointer to the correct list in list_in_scope.
357 FIXME: The original dwarf code just treated the file scope as the first
358 local scope, and all other local scopes as nested local scopes, and worked
359 fine. Check to see if we really need to distinguish these in buildsym.c */
361 struct pending **list_in_scope = &file_symbols;
363 /* DIES which have user defined types or modified user defined types refer to
364 other DIES for the type information. Thus we need to associate the offset
365 of a DIE for a user defined type with a pointer to the type information.
367 Originally this was done using a simple but expensive algorithm, with an
368 array of unsorted structures, each containing an offset/type-pointer pair.
369 This array was scanned linearly each time a lookup was done. The result
370 was that gdb was spending over half it's startup time munging through this
371 array of pointers looking for a structure that had the right offset member.
373 The second attempt used the same array of structures, but the array was
374 sorted using qsort each time a new offset/type was recorded, and a binary
375 search was used to find the type pointer for a given DIE offset. This was
376 even slower, due to the overhead of sorting the array each time a new
377 offset/type pair was entered.
379 The third attempt uses a fixed size array of type pointers, indexed by a
380 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
381 we can divide any DIE offset by 4 to obtain a unique index into this fixed
382 size array. Since each element is a 4 byte pointer, it takes exactly as
383 much memory to hold this array as to hold the DWARF info for a given
384 compilation unit. But it gets freed as soon as we are done with it.
385 This has worked well in practice, as a reasonable tradeoff between memory
386 consumption and speed, without having to resort to much more complicated
389 static struct type **utypes; /* Pointer to array of user type pointers */
390 static int numutypes; /* Max number of user type pointers */
392 /* Maintain an array of referenced fundamental types for the current
393 compilation unit being read. For DWARF version 1, we have to construct
394 the fundamental types on the fly, since no information about the
395 fundamental types is supplied. Each such fundamental type is created by
396 calling a language dependent routine to create the type, and then a
397 pointer to that type is then placed in the array at the index specified
398 by it's FT_<TYPENAME> value. The array has a fixed size set by the
399 FT_NUM_MEMBERS compile time constant, which is the number of predefined
400 fundamental types gdb knows how to construct. */
402 static struct type *ftypes[FT_NUM_MEMBERS]; /* Fundamental types */
404 /* Record the language for the compilation unit which is currently being
405 processed. We know it once we have seen the TAG_compile_unit DIE,
406 and we need it while processing the DIE's for that compilation unit.
407 It is eventually saved in the symtab structure, but we don't finalize
408 the symtab struct until we have processed all the DIE's for the
409 compilation unit. We also need to get and save a pointer to the
410 language struct for this language, so we can call the language
411 dependent routines for doing things such as creating fundamental
414 static enum language cu_language;
415 static const struct language_defn *cu_language_defn;
417 /* Forward declarations of static functions so we don't have to worry
418 about ordering within this file. */
420 static void free_utypes (void *);
422 static int attribute_size (unsigned int);
424 static CORE_ADDR target_to_host (char *, int, int, struct objfile *);
426 static void add_enum_psymbol (struct dieinfo *, struct objfile *);
428 static void handle_producer (char *);
430 static void read_file_scope (struct dieinfo *, char *, char *,
433 static void read_func_scope (struct dieinfo *, char *, char *,
436 static void read_lexical_block_scope (struct dieinfo *, char *, char *,
439 static void scan_partial_symbols (char *, char *, struct objfile *);
441 static void scan_compilation_units (char *, char *, file_ptr, file_ptr,
444 static void add_partial_symbol (struct dieinfo *, struct objfile *);
446 static void basicdieinfo (struct dieinfo *, char *, struct objfile *);
448 static void completedieinfo (struct dieinfo *, struct objfile *);
450 static void dwarf_psymtab_to_symtab (struct partial_symtab *);
452 static void psymtab_to_symtab_1 (struct partial_symtab *);
454 static void read_ofile_symtab (struct partial_symtab *);
456 static void process_dies (char *, char *, struct objfile *);
458 static void read_structure_scope (struct dieinfo *, char *, char *,
461 static struct type *decode_array_element_type (char *);
463 static struct type *decode_subscript_data_item (char *, char *);
465 static void dwarf_read_array_type (struct dieinfo *);
467 static void read_tag_pointer_type (struct dieinfo *dip);
469 static void read_tag_string_type (struct dieinfo *dip);
471 static void read_subroutine_type (struct dieinfo *, char *, char *);
473 static void read_enumeration (struct dieinfo *, char *, char *,
476 static struct type *struct_type (struct dieinfo *, char *, char *,
479 static struct type *enum_type (struct dieinfo *, struct objfile *);
481 static void decode_line_numbers (char *);
483 static struct type *decode_die_type (struct dieinfo *);
485 static struct type *decode_mod_fund_type (char *);
487 static struct type *decode_mod_u_d_type (char *);
489 static struct type *decode_modified_type (char *, unsigned int, int);
491 static struct type *decode_fund_type (unsigned int);
493 static char *create_name (char *, struct obstack *);
495 static struct type *lookup_utype (DIE_REF);
497 static struct type *alloc_utype (DIE_REF, struct type *);
499 static struct symbol *new_symbol (struct dieinfo *, struct objfile *);
501 static void synthesize_typedef (struct dieinfo *, struct objfile *,
504 static int locval (struct dieinfo *);
506 static void set_cu_language (struct dieinfo *);
508 static struct type *dwarf_fundamental_type (struct objfile *, int);
515 dwarf_fundamental_type -- lookup or create a fundamental type
520 dwarf_fundamental_type (struct objfile *objfile, int typeid)
524 DWARF version 1 doesn't supply any fundamental type information,
525 so gdb has to construct such types. It has a fixed number of
526 fundamental types that it knows how to construct, which is the
527 union of all types that it knows how to construct for all languages
528 that it knows about. These are enumerated in gdbtypes.h.
530 As an example, assume we find a DIE that references a DWARF
531 fundamental type of FT_integer. We first look in the ftypes
532 array to see if we already have such a type, indexed by the
533 gdb internal value of FT_INTEGER. If so, we simply return a
534 pointer to that type. If not, then we ask an appropriate
535 language dependent routine to create a type FT_INTEGER, using
536 defaults reasonable for the current target machine, and install
537 that type in ftypes for future reference.
541 Pointer to a fundamental type.
546 dwarf_fundamental_type (struct objfile *objfile, int typeid)
548 if (typeid < 0 || typeid >= FT_NUM_MEMBERS)
550 error ("internal error - invalid fundamental type id %d", typeid);
553 /* Look for this particular type in the fundamental type vector. If one is
554 not found, create and install one appropriate for the current language
555 and the current target machine. */
557 if (ftypes[typeid] == NULL)
559 ftypes[typeid] = cu_language_defn->la_fund_type (objfile, typeid);
562 return (ftypes[typeid]);
569 set_cu_language -- set local copy of language for compilation unit
574 set_cu_language (struct dieinfo *dip)
578 Decode the language attribute for a compilation unit DIE and
579 remember what the language was. We use this at various times
580 when processing DIE's for a given compilation unit.
589 set_cu_language (struct dieinfo *dip)
591 switch (dip->at_language)
595 cu_language = language_c;
597 case LANG_C_PLUS_PLUS:
598 cu_language = language_cplus;
601 cu_language = language_m2;
605 cu_language = language_fortran;
611 /* We don't know anything special about these yet. */
612 cu_language = language_unknown;
615 /* If no at_language, try to deduce one from the filename */
616 cu_language = deduce_language_from_filename (dip->at_name);
619 cu_language_defn = language_def (cu_language);
626 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
630 void dwarf_build_psymtabs (struct objfile *objfile,
631 int mainline, file_ptr dbfoff, unsigned int dbfsize,
632 file_ptr lnoffset, unsigned int lnsize)
636 This function is called upon to build partial symtabs from files
637 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
639 It is passed a bfd* containing the DIES
640 and line number information, the corresponding filename for that
641 file, a base address for relocating the symbols, a flag indicating
642 whether or not this debugging information is from a "main symbol
643 table" rather than a shared library or dynamically linked file,
644 and file offset/size pairs for the DIE information and line number
654 dwarf_build_psymtabs (struct objfile *objfile, int mainline, file_ptr dbfoff,
655 unsigned int dbfsize, file_ptr lnoffset,
658 bfd *abfd = objfile->obfd;
659 struct cleanup *back_to;
661 current_objfile = objfile;
663 dbbase = xmalloc (dbsize);
665 if ((bfd_seek (abfd, dbfoff, SEEK_SET) != 0) ||
666 (bfd_bread (dbbase, dbsize, abfd) != dbsize))
669 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd));
671 back_to = make_cleanup (xfree, dbbase);
673 /* If we are reinitializing, or if we have never loaded syms yet, init.
674 Since we have no idea how many DIES we are looking at, we just guess
675 some arbitrary value. */
678 || (objfile->global_psymbols.size == 0
679 && objfile->static_psymbols.size == 0))
681 init_psymbol_list (objfile, 1024);
684 /* Save the relocation factor where everybody can see it. */
686 base_section_offsets = objfile->section_offsets;
687 baseaddr = ANOFFSET (objfile->section_offsets, 0);
689 /* Follow the compilation unit sibling chain, building a partial symbol
690 table entry for each one. Save enough information about each compilation
691 unit to locate the full DWARF information later. */
693 scan_compilation_units (dbbase, dbbase + dbsize, dbfoff, lnoffset, objfile);
695 do_cleanups (back_to);
696 current_objfile = NULL;
703 read_lexical_block_scope -- process all dies in a lexical block
707 static void read_lexical_block_scope (struct dieinfo *dip,
708 char *thisdie, char *enddie)
712 Process all the DIES contained within a lexical block scope.
713 Start a new scope, process the dies, and then close the scope.
718 read_lexical_block_scope (struct dieinfo *dip, char *thisdie, char *enddie,
719 struct objfile *objfile)
721 struct context_stack *new;
723 push_context (0, dip->at_low_pc);
724 process_dies (thisdie + dip->die_length, enddie, objfile);
725 new = pop_context ();
726 if (local_symbols != NULL)
728 finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
729 dip->at_high_pc, objfile);
731 local_symbols = new->locals;
738 lookup_utype -- look up a user defined type from die reference
742 static type *lookup_utype (DIE_REF die_ref)
746 Given a DIE reference, lookup the user defined type associated with
747 that DIE, if it has been registered already. If not registered, then
748 return NULL. Alloc_utype() can be called to register an empty
749 type for this reference, which will be filled in later when the
750 actual referenced DIE is processed.
754 lookup_utype (DIE_REF die_ref)
756 struct type *type = NULL;
759 utypeidx = (die_ref - dbroff) / 4;
760 if ((utypeidx < 0) || (utypeidx >= numutypes))
762 bad_die_ref_complaint (DIE_ID, DIE_NAME, die_ref);
766 type = *(utypes + utypeidx);
776 alloc_utype -- add a user defined type for die reference
780 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
784 Given a die reference DIE_REF, and a possible pointer to a user
785 defined type UTYPEP, register that this reference has a user
786 defined type and either use the specified type in UTYPEP or
787 make a new empty type that will be filled in later.
789 We should only be called after calling lookup_utype() to verify that
790 there is not currently a type registered for DIE_REF.
794 alloc_utype (DIE_REF die_ref, struct type *utypep)
799 utypeidx = (die_ref - dbroff) / 4;
800 typep = utypes + utypeidx;
801 if ((utypeidx < 0) || (utypeidx >= numutypes))
803 utypep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
804 bad_die_ref_complaint (DIE_ID, DIE_NAME, die_ref);
806 else if (*typep != NULL)
809 complaint (&symfile_complaints,
810 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation",
817 utypep = alloc_type (current_objfile);
828 free_utypes -- free the utypes array and reset pointer & count
832 static void free_utypes (void *dummy)
836 Called via do_cleanups to free the utypes array, reset the pointer to NULL,
837 and set numutypes back to zero. This ensures that the utypes does not get
838 referenced after being freed.
842 free_utypes (void *dummy)
854 decode_die_type -- return a type for a specified die
858 static struct type *decode_die_type (struct dieinfo *dip)
862 Given a pointer to a die information structure DIP, decode the
863 type of the die and return a pointer to the decoded type. All
864 dies without specific types default to type int.
868 decode_die_type (struct dieinfo *dip)
870 struct type *type = NULL;
872 if (dip->at_fund_type != 0)
874 type = decode_fund_type (dip->at_fund_type);
876 else if (dip->at_mod_fund_type != NULL)
878 type = decode_mod_fund_type (dip->at_mod_fund_type);
880 else if (dip->at_user_def_type)
882 type = lookup_utype (dip->at_user_def_type);
885 type = alloc_utype (dip->at_user_def_type, NULL);
888 else if (dip->at_mod_u_d_type)
890 type = decode_mod_u_d_type (dip->at_mod_u_d_type);
894 type = dwarf_fundamental_type (current_objfile, FT_VOID);
903 struct_type -- compute and return the type for a struct or union
907 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
908 char *enddie, struct objfile *objfile)
912 Given pointer to a die information structure for a die which
913 defines a union or structure (and MUST define one or the other),
914 and pointers to the raw die data that define the range of dies which
915 define the members, compute and return the user defined type for the
920 struct_type (struct dieinfo *dip, char *thisdie, char *enddie,
921 struct objfile *objfile)
926 struct nextfield *next;
929 struct nextfield *list = NULL;
930 struct nextfield *new;
937 type = lookup_utype (dip->die_ref);
940 /* No forward references created an empty type, so install one now */
941 type = alloc_utype (dip->die_ref, NULL);
943 INIT_CPLUS_SPECIFIC (type);
944 switch (dip->die_tag)
947 TYPE_CODE (type) = TYPE_CODE_CLASS;
949 case TAG_structure_type:
950 TYPE_CODE (type) = TYPE_CODE_STRUCT;
953 TYPE_CODE (type) = TYPE_CODE_UNION;
956 /* Should never happen */
957 TYPE_CODE (type) = TYPE_CODE_UNDEF;
958 complaint (&symfile_complaints,
959 "DIE @ 0x%x \"%s\", missing class, structure, or union tag",
963 /* Some compilers try to be helpful by inventing "fake" names for
964 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
965 Thanks, but no thanks... */
966 if (dip->at_name != NULL
967 && *dip->at_name != '~'
968 && *dip->at_name != '.')
970 TYPE_TAG_NAME (type) = obconcat (&objfile->objfile_obstack,
971 "", "", dip->at_name);
973 /* Use whatever size is known. Zero is a valid size. We might however
974 wish to check has_at_byte_size to make sure that some byte size was
975 given explicitly, but DWARF doesn't specify that explicit sizes of
976 zero have to present, so complaining about missing sizes should
977 probably not be the default. */
978 TYPE_LENGTH (type) = dip->at_byte_size;
979 thisdie += dip->die_length;
980 while (thisdie < enddie)
982 basicdieinfo (&mbr, thisdie, objfile);
983 completedieinfo (&mbr, objfile);
984 if (mbr.die_length <= SIZEOF_DIE_LENGTH)
988 else if (mbr.at_sibling != 0)
990 nextdie = dbbase + mbr.at_sibling - dbroff;
994 nextdie = thisdie + mbr.die_length;
999 /* Static fields can be either TAG_global_variable (GCC) or else
1000 TAG_member with no location (Diab). We could treat the latter like
1001 the former... but since we don't support the former, just avoid
1002 crashing on the latter for now. */
1003 if (mbr.at_location == NULL)
1006 /* Get space to record the next field's data. */
1007 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1010 /* Save the data. */
1012 obsavestring (mbr.at_name, strlen (mbr.at_name),
1013 &objfile->objfile_obstack);
1014 FIELD_TYPE (list->field) = decode_die_type (&mbr);
1015 FIELD_BITPOS (list->field) = 8 * locval (&mbr);
1016 FIELD_STATIC_KIND (list->field) = 0;
1017 /* Handle bit fields. */
1018 FIELD_BITSIZE (list->field) = mbr.at_bit_size;
1019 if (BITS_BIG_ENDIAN)
1021 /* For big endian bits, the at_bit_offset gives the
1022 additional bit offset from the MSB of the containing
1023 anonymous object to the MSB of the field. We don't
1024 have to do anything special since we don't need to
1025 know the size of the anonymous object. */
1026 FIELD_BITPOS (list->field) += mbr.at_bit_offset;
1030 /* For little endian bits, we need to have a non-zero
1031 at_bit_size, so that we know we are in fact dealing
1032 with a bitfield. Compute the bit offset to the MSB
1033 of the anonymous object, subtract off the number of
1034 bits from the MSB of the field to the MSB of the
1035 object, and then subtract off the number of bits of
1036 the field itself. The result is the bit offset of
1037 the LSB of the field. */
1038 if (mbr.at_bit_size > 0)
1040 if (mbr.has_at_byte_size)
1042 /* The size of the anonymous object containing
1043 the bit field is explicit, so use the
1044 indicated size (in bytes). */
1045 anonymous_size = mbr.at_byte_size;
1049 /* The size of the anonymous object containing
1050 the bit field matches the size of an object
1051 of the bit field's type. DWARF allows
1052 at_byte_size to be left out in such cases, as
1053 a debug information size optimization. */
1054 anonymous_size = TYPE_LENGTH (list->field.type);
1056 FIELD_BITPOS (list->field) +=
1057 anonymous_size * 8 - mbr.at_bit_offset - mbr.at_bit_size;
1063 process_dies (thisdie, nextdie, objfile);
1068 /* Now create the vector of fields, and record how big it is. We may
1069 not even have any fields, if this DIE was generated due to a reference
1070 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1071 set, which clues gdb in to the fact that it needs to search elsewhere
1072 for the full structure definition. */
1075 TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
1079 TYPE_NFIELDS (type) = nfields;
1080 TYPE_FIELDS (type) = (struct field *)
1081 TYPE_ALLOC (type, sizeof (struct field) * nfields);
1082 /* Copy the saved-up fields into the field vector. */
1083 for (n = nfields; list; list = list->next)
1085 TYPE_FIELD (type, --n) = list->field;
1095 read_structure_scope -- process all dies within struct or union
1099 static void read_structure_scope (struct dieinfo *dip,
1100 char *thisdie, char *enddie, struct objfile *objfile)
1104 Called when we find the DIE that starts a structure or union
1105 scope (definition) to process all dies that define the members
1106 of the structure or union. DIP is a pointer to the die info
1107 struct for the DIE that names the structure or union.
1111 Note that we need to call struct_type regardless of whether or not
1112 the DIE has an at_name attribute, since it might be an anonymous
1113 structure or union. This gets the type entered into our set of
1116 However, if the structure is incomplete (an opaque struct/union)
1117 then suppress creating a symbol table entry for it since gdb only
1118 wants to find the one with the complete definition. Note that if
1119 it is complete, we just call new_symbol, which does it's own
1120 checking about whether the struct/union is anonymous or not (and
1121 suppresses creating a symbol table entry itself).
1126 read_structure_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1127 struct objfile *objfile)
1132 type = struct_type (dip, thisdie, enddie, objfile);
1133 if (!TYPE_STUB (type))
1135 sym = new_symbol (dip, objfile);
1138 SYMBOL_TYPE (sym) = type;
1139 if (cu_language == language_cplus)
1141 synthesize_typedef (dip, objfile, type);
1151 decode_array_element_type -- decode type of the array elements
1155 static struct type *decode_array_element_type (char *scan, char *end)
1159 As the last step in decoding the array subscript information for an
1160 array DIE, we need to decode the type of the array elements. We are
1161 passed a pointer to this last part of the subscript information and
1162 must return the appropriate type. If the type attribute is not
1163 recognized, just warn about the problem and return type int.
1166 static struct type *
1167 decode_array_element_type (char *scan)
1171 unsigned short attribute;
1172 unsigned short fundtype;
1175 attribute = target_to_host (scan, SIZEOF_ATTRIBUTE, GET_UNSIGNED,
1177 scan += SIZEOF_ATTRIBUTE;
1178 nbytes = attribute_size (attribute);
1181 bad_array_element_type_complaint (DIE_ID, DIE_NAME, attribute);
1182 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1189 fundtype = target_to_host (scan, nbytes, GET_UNSIGNED,
1191 typep = decode_fund_type (fundtype);
1193 case AT_mod_fund_type:
1194 typep = decode_mod_fund_type (scan);
1196 case AT_user_def_type:
1197 die_ref = target_to_host (scan, nbytes, GET_UNSIGNED,
1199 typep = lookup_utype (die_ref);
1202 typep = alloc_utype (die_ref, NULL);
1205 case AT_mod_u_d_type:
1206 typep = decode_mod_u_d_type (scan);
1209 bad_array_element_type_complaint (DIE_ID, DIE_NAME, attribute);
1210 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1221 decode_subscript_data_item -- decode array subscript item
1225 static struct type *
1226 decode_subscript_data_item (char *scan, char *end)
1230 The array subscripts and the data type of the elements of an
1231 array are described by a list of data items, stored as a block
1232 of contiguous bytes. There is a data item describing each array
1233 dimension, and a final data item describing the element type.
1234 The data items are ordered the same as their appearance in the
1235 source (I.E. leftmost dimension first, next to leftmost second,
1238 The data items describing each array dimension consist of four
1239 parts: (1) a format specifier, (2) type type of the subscript
1240 index, (3) a description of the low bound of the array dimension,
1241 and (4) a description of the high bound of the array dimension.
1243 The last data item is the description of the type of each of
1246 We are passed a pointer to the start of the block of bytes
1247 containing the remaining data items, and a pointer to the first
1248 byte past the data. This function recursively decodes the
1249 remaining data items and returns a type.
1251 If we somehow fail to decode some data, we complain about it
1252 and return a type "array of int".
1255 FIXME: This code only implements the forms currently used
1256 by the AT&T and GNU C compilers.
1258 The end pointer is supplied for error checking, maybe we should
1262 static struct type *
1263 decode_subscript_data_item (char *scan, char *end)
1265 struct type *typep = NULL; /* Array type we are building */
1266 struct type *nexttype; /* Type of each element (may be array) */
1267 struct type *indextype; /* Type of this index */
1268 struct type *rangetype;
1269 unsigned int format;
1270 unsigned short fundtype;
1271 unsigned long lowbound;
1272 unsigned long highbound;
1275 format = target_to_host (scan, SIZEOF_FORMAT_SPECIFIER, GET_UNSIGNED,
1277 scan += SIZEOF_FORMAT_SPECIFIER;
1281 typep = decode_array_element_type (scan);
1284 fundtype = target_to_host (scan, SIZEOF_FMT_FT, GET_UNSIGNED,
1286 indextype = decode_fund_type (fundtype);
1287 scan += SIZEOF_FMT_FT;
1288 nbytes = TARGET_FT_LONG_SIZE (current_objfile);
1289 lowbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile);
1291 highbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile);
1293 nexttype = decode_subscript_data_item (scan, end);
1294 if (nexttype == NULL)
1296 /* Munged subscript data or other problem, fake it. */
1297 complaint (&symfile_complaints,
1298 "DIE @ 0x%x \"%s\", can't decode subscript data items",
1300 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1302 rangetype = create_range_type ((struct type *) NULL, indextype,
1303 lowbound, highbound);
1304 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1313 complaint (&symfile_complaints,
1314 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet",
1315 DIE_ID, DIE_NAME, format);
1316 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1317 rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0);
1318 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1321 complaint (&symfile_complaints,
1322 "DIE @ 0x%x \"%s\", unknown array subscript format %x", DIE_ID,
1324 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1325 rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0);
1326 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1336 dwarf_read_array_type -- read TAG_array_type DIE
1340 static void dwarf_read_array_type (struct dieinfo *dip)
1344 Extract all information from a TAG_array_type DIE and add to
1345 the user defined type vector.
1349 dwarf_read_array_type (struct dieinfo *dip)
1355 unsigned short blocksz;
1358 if (dip->at_ordering != ORD_row_major)
1360 /* FIXME: Can gdb even handle column major arrays? */
1361 complaint (&symfile_complaints,
1362 "DIE @ 0x%x \"%s\", array not row major; not handled correctly",
1365 sub = dip->at_subscr_data;
1368 nbytes = attribute_size (AT_subscr_data);
1369 blocksz = target_to_host (sub, nbytes, GET_UNSIGNED, current_objfile);
1370 subend = sub + nbytes + blocksz;
1372 type = decode_subscript_data_item (sub, subend);
1373 utype = lookup_utype (dip->die_ref);
1376 /* Install user defined type that has not been referenced yet. */
1377 alloc_utype (dip->die_ref, type);
1379 else if (TYPE_CODE (utype) == TYPE_CODE_UNDEF)
1381 /* Ick! A forward ref has already generated a blank type in our
1382 slot, and this type probably already has things pointing to it
1383 (which is what caused it to be created in the first place).
1384 If it's just a place holder we can plop our fully defined type
1385 on top of it. We can't recover the space allocated for our
1386 new type since it might be on an obstack, but we could reuse
1387 it if we kept a list of them, but it might not be worth it
1393 /* Double ick! Not only is a type already in our slot, but
1394 someone has decorated it. Complain and leave it alone. */
1395 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1404 read_tag_pointer_type -- read TAG_pointer_type DIE
1408 static void read_tag_pointer_type (struct dieinfo *dip)
1412 Extract all information from a TAG_pointer_type DIE and add to
1413 the user defined type vector.
1417 read_tag_pointer_type (struct dieinfo *dip)
1422 type = decode_die_type (dip);
1423 utype = lookup_utype (dip->die_ref);
1426 utype = lookup_pointer_type (type);
1427 alloc_utype (dip->die_ref, utype);
1431 TYPE_TARGET_TYPE (utype) = type;
1432 TYPE_POINTER_TYPE (type) = utype;
1434 /* We assume the machine has only one representation for pointers! */
1435 /* FIXME: Possably a poor assumption */
1436 TYPE_LENGTH (utype) = TARGET_PTR_BIT / TARGET_CHAR_BIT;
1437 TYPE_CODE (utype) = TYPE_CODE_PTR;
1445 read_tag_string_type -- read TAG_string_type DIE
1449 static void read_tag_string_type (struct dieinfo *dip)
1453 Extract all information from a TAG_string_type DIE and add to
1454 the user defined type vector. It isn't really a user defined
1455 type, but it behaves like one, with other DIE's using an
1456 AT_user_def_type attribute to reference it.
1460 read_tag_string_type (struct dieinfo *dip)
1463 struct type *indextype;
1464 struct type *rangetype;
1465 unsigned long lowbound = 0;
1466 unsigned long highbound;
1468 if (dip->has_at_byte_size)
1470 /* A fixed bounds string */
1471 highbound = dip->at_byte_size - 1;
1475 /* A varying length string. Stub for now. (FIXME) */
1478 indextype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1479 rangetype = create_range_type ((struct type *) NULL, indextype, lowbound,
1482 utype = lookup_utype (dip->die_ref);
1485 /* No type defined, go ahead and create a blank one to use. */
1486 utype = alloc_utype (dip->die_ref, (struct type *) NULL);
1490 /* Already a type in our slot due to a forward reference. Make sure it
1491 is a blank one. If not, complain and leave it alone. */
1492 if (TYPE_CODE (utype) != TYPE_CODE_UNDEF)
1494 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1499 /* Create the string type using the blank type we either found or created. */
1500 utype = create_string_type (utype, rangetype);
1507 read_subroutine_type -- process TAG_subroutine_type dies
1511 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1516 Handle DIES due to C code like:
1519 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1525 The parameter DIES are currently ignored. See if gdb has a way to
1526 include this info in it's type system, and decode them if so. Is
1527 this what the type structure's "arg_types" field is for? (FIXME)
1531 read_subroutine_type (struct dieinfo *dip, char *thisdie, char *enddie)
1533 struct type *type; /* Type that this function returns */
1534 struct type *ftype; /* Function that returns above type */
1536 /* Decode the type that this subroutine returns */
1538 type = decode_die_type (dip);
1540 /* Check to see if we already have a partially constructed user
1541 defined type for this DIE, from a forward reference. */
1543 ftype = lookup_utype (dip->die_ref);
1546 /* This is the first reference to one of these types. Make
1547 a new one and place it in the user defined types. */
1548 ftype = lookup_function_type (type);
1549 alloc_utype (dip->die_ref, ftype);
1551 else if (TYPE_CODE (ftype) == TYPE_CODE_UNDEF)
1553 /* We have an existing partially constructed type, so bash it
1554 into the correct type. */
1555 TYPE_TARGET_TYPE (ftype) = type;
1556 TYPE_LENGTH (ftype) = 1;
1557 TYPE_CODE (ftype) = TYPE_CODE_FUNC;
1561 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1569 read_enumeration -- process dies which define an enumeration
1573 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1574 char *enddie, struct objfile *objfile)
1578 Given a pointer to a die which begins an enumeration, process all
1579 the dies that define the members of the enumeration.
1583 Note that we need to call enum_type regardless of whether or not we
1584 have a symbol, since we might have an enum without a tag name (thus
1585 no symbol for the tagname).
1589 read_enumeration (struct dieinfo *dip, char *thisdie, char *enddie,
1590 struct objfile *objfile)
1595 type = enum_type (dip, objfile);
1596 sym = new_symbol (dip, objfile);
1599 SYMBOL_TYPE (sym) = type;
1600 if (cu_language == language_cplus)
1602 synthesize_typedef (dip, objfile, type);
1611 enum_type -- decode and return a type for an enumeration
1615 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1619 Given a pointer to a die information structure for the die which
1620 starts an enumeration, process all the dies that define the members
1621 of the enumeration and return a type pointer for the enumeration.
1623 At the same time, for each member of the enumeration, create a
1624 symbol for it with domain VAR_DOMAIN and class LOC_CONST,
1625 and give it the type of the enumeration itself.
1629 Note that the DWARF specification explicitly mandates that enum
1630 constants occur in reverse order from the source program order,
1631 for "consistency" and because this ordering is easier for many
1632 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1633 Entries). Because gdb wants to see the enum members in program
1634 source order, we have to ensure that the order gets reversed while
1635 we are processing them.
1638 static struct type *
1639 enum_type (struct dieinfo *dip, struct objfile *objfile)
1644 struct nextfield *next;
1647 struct nextfield *list = NULL;
1648 struct nextfield *new;
1653 unsigned short blocksz;
1656 int unsigned_enum = 1;
1658 type = lookup_utype (dip->die_ref);
1661 /* No forward references created an empty type, so install one now */
1662 type = alloc_utype (dip->die_ref, NULL);
1664 TYPE_CODE (type) = TYPE_CODE_ENUM;
1665 /* Some compilers try to be helpful by inventing "fake" names for
1666 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1667 Thanks, but no thanks... */
1668 if (dip->at_name != NULL
1669 && *dip->at_name != '~'
1670 && *dip->at_name != '.')
1672 TYPE_TAG_NAME (type) = obconcat (&objfile->objfile_obstack,
1673 "", "", dip->at_name);
1675 if (dip->at_byte_size != 0)
1677 TYPE_LENGTH (type) = dip->at_byte_size;
1679 scan = dip->at_element_list;
1682 if (dip->short_element_list)
1684 nbytes = attribute_size (AT_short_element_list);
1688 nbytes = attribute_size (AT_element_list);
1690 blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile);
1691 listend = scan + nbytes + blocksz;
1693 while (scan < listend)
1695 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1698 FIELD_TYPE (list->field) = NULL;
1699 FIELD_BITSIZE (list->field) = 0;
1700 FIELD_STATIC_KIND (list->field) = 0;
1701 FIELD_BITPOS (list->field) =
1702 target_to_host (scan, TARGET_FT_LONG_SIZE (objfile), GET_SIGNED,
1704 scan += TARGET_FT_LONG_SIZE (objfile);
1705 list->field.name = obsavestring (scan, strlen (scan),
1706 &objfile->objfile_obstack);
1707 scan += strlen (scan) + 1;
1709 /* Handcraft a new symbol for this enum member. */
1710 sym = (struct symbol *) obstack_alloc (&objfile->objfile_obstack,
1711 sizeof (struct symbol));
1712 memset (sym, 0, sizeof (struct symbol));
1713 DEPRECATED_SYMBOL_NAME (sym) = create_name (list->field.name,
1714 &objfile->objfile_obstack);
1715 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language);
1716 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1717 SYMBOL_CLASS (sym) = LOC_CONST;
1718 SYMBOL_TYPE (sym) = type;
1719 SYMBOL_VALUE (sym) = FIELD_BITPOS (list->field);
1720 if (SYMBOL_VALUE (sym) < 0)
1722 add_symbol_to_list (sym, list_in_scope);
1724 /* Now create the vector of fields, and record how big it is. This is
1725 where we reverse the order, by pulling the members off the list in
1726 reverse order from how they were inserted. If we have no fields
1727 (this is apparently possible in C++) then skip building a field
1732 TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED;
1733 TYPE_NFIELDS (type) = nfields;
1734 TYPE_FIELDS (type) = (struct field *)
1735 obstack_alloc (&objfile->objfile_obstack, sizeof (struct field) * nfields);
1736 /* Copy the saved-up fields into the field vector. */
1737 for (n = 0; (n < nfields) && (list != NULL); list = list->next)
1739 TYPE_FIELD (type, n++) = list->field;
1750 read_func_scope -- process all dies within a function scope
1754 Process all dies within a given function scope. We are passed
1755 a die information structure pointer DIP for the die which
1756 starts the function scope, and pointers into the raw die data
1757 that define the dies within the function scope.
1759 For now, we ignore lexical block scopes within the function.
1760 The problem is that AT&T cc does not define a DWARF lexical
1761 block scope for the function itself, while gcc defines a
1762 lexical block scope for the function. We need to think about
1763 how to handle this difference, or if it is even a problem.
1768 read_func_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1769 struct objfile *objfile)
1771 struct context_stack *new;
1773 /* AT_name is absent if the function is described with an
1774 AT_abstract_origin tag.
1775 Ignore the function description for now to avoid GDB core dumps.
1776 FIXME: Add code to handle AT_abstract_origin tags properly. */
1777 if (dip->at_name == NULL)
1779 complaint (&symfile_complaints, "DIE @ 0x%x, AT_name tag missing",
1784 if (objfile->ei.entry_point >= dip->at_low_pc &&
1785 objfile->ei.entry_point < dip->at_high_pc)
1787 objfile->ei.entry_func_lowpc = dip->at_low_pc;
1788 objfile->ei.entry_func_highpc = dip->at_high_pc;
1790 new = push_context (0, dip->at_low_pc);
1791 new->name = new_symbol (dip, objfile);
1792 list_in_scope = &local_symbols;
1793 process_dies (thisdie + dip->die_length, enddie, objfile);
1794 new = pop_context ();
1795 /* Make a block for the local symbols within. */
1796 finish_block (new->name, &local_symbols, new->old_blocks,
1797 new->start_addr, dip->at_high_pc, objfile);
1798 list_in_scope = &file_symbols;
1806 handle_producer -- process the AT_producer attribute
1810 Perform any operations that depend on finding a particular
1811 AT_producer attribute.
1816 handle_producer (char *producer)
1819 /* If this compilation unit was compiled with g++ or gcc, then set the
1820 processing_gcc_compilation flag. */
1822 if (DEPRECATED_STREQN (producer, GCC_PRODUCER, strlen (GCC_PRODUCER)))
1824 char version = producer[strlen (GCC_PRODUCER)];
1825 processing_gcc_compilation = (version == '2' ? 2 : 1);
1829 processing_gcc_compilation =
1830 strncmp (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER)) == 0;
1833 /* Select a demangling style if we can identify the producer and if
1834 the current style is auto. We leave the current style alone if it
1835 is not auto. We also leave the demangling style alone if we find a
1836 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1838 if (AUTO_DEMANGLING)
1840 if (DEPRECATED_STREQN (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER)))
1843 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't
1844 know whether it will use the old style or v3 mangling. */
1845 set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
1848 else if (DEPRECATED_STREQN (producer, LCC_PRODUCER, strlen (LCC_PRODUCER)))
1850 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING);
1860 read_file_scope -- process all dies within a file scope
1864 Process all dies within a given file scope. We are passed a
1865 pointer to the die information structure for the die which
1866 starts the file scope, and pointers into the raw die data which
1867 mark the range of dies within the file scope.
1869 When the partial symbol table is built, the file offset for the line
1870 number table for each compilation unit is saved in the partial symbol
1871 table entry for that compilation unit. As the symbols for each
1872 compilation unit are read, the line number table is read into memory
1873 and the variable lnbase is set to point to it. Thus all we have to
1874 do is use lnbase to access the line number table for the current
1879 read_file_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1880 struct objfile *objfile)
1882 struct cleanup *back_to;
1883 struct symtab *symtab;
1885 if (objfile->ei.entry_point >= dip->at_low_pc &&
1886 objfile->ei.entry_point < dip->at_high_pc)
1888 objfile->ei.deprecated_entry_file_lowpc = dip->at_low_pc;
1889 objfile->ei.deprecated_entry_file_highpc = dip->at_high_pc;
1891 set_cu_language (dip);
1892 if (dip->at_producer != NULL)
1894 handle_producer (dip->at_producer);
1896 numutypes = (enddie - thisdie) / 4;
1897 utypes = (struct type **) xmalloc (numutypes * sizeof (struct type *));
1898 back_to = make_cleanup (free_utypes, NULL);
1899 memset (utypes, 0, numutypes * sizeof (struct type *));
1900 memset (ftypes, 0, FT_NUM_MEMBERS * sizeof (struct type *));
1901 start_symtab (dip->at_name, dip->at_comp_dir, dip->at_low_pc);
1902 record_debugformat ("DWARF 1");
1903 decode_line_numbers (lnbase);
1904 process_dies (thisdie + dip->die_length, enddie, objfile);
1906 symtab = end_symtab (dip->at_high_pc, objfile, 0);
1909 symtab->language = cu_language;
1911 do_cleanups (back_to);
1918 process_dies -- process a range of DWARF Information Entries
1922 static void process_dies (char *thisdie, char *enddie,
1923 struct objfile *objfile)
1927 Process all DIE's in a specified range. May be (and almost
1928 certainly will be) called recursively.
1932 process_dies (char *thisdie, char *enddie, struct objfile *objfile)
1937 while (thisdie < enddie)
1939 basicdieinfo (&di, thisdie, objfile);
1940 if (di.die_length < SIZEOF_DIE_LENGTH)
1944 else if (di.die_tag == TAG_padding)
1946 nextdie = thisdie + di.die_length;
1950 completedieinfo (&di, objfile);
1951 if (di.at_sibling != 0)
1953 nextdie = dbbase + di.at_sibling - dbroff;
1957 nextdie = thisdie + di.die_length;
1959 /* I think that these are always text, not data, addresses. */
1960 di.at_low_pc = SMASH_TEXT_ADDRESS (di.at_low_pc);
1961 di.at_high_pc = SMASH_TEXT_ADDRESS (di.at_high_pc);
1964 case TAG_compile_unit:
1965 /* Skip Tag_compile_unit if we are already inside a compilation
1966 unit, we are unable to handle nested compilation units
1967 properly (FIXME). */
1968 if (current_subfile == NULL)
1969 read_file_scope (&di, thisdie, nextdie, objfile);
1971 nextdie = thisdie + di.die_length;
1973 case TAG_global_subroutine:
1974 case TAG_subroutine:
1975 if (di.has_at_low_pc)
1977 read_func_scope (&di, thisdie, nextdie, objfile);
1980 case TAG_lexical_block:
1981 read_lexical_block_scope (&di, thisdie, nextdie, objfile);
1983 case TAG_class_type:
1984 case TAG_structure_type:
1985 case TAG_union_type:
1986 read_structure_scope (&di, thisdie, nextdie, objfile);
1988 case TAG_enumeration_type:
1989 read_enumeration (&di, thisdie, nextdie, objfile);
1991 case TAG_subroutine_type:
1992 read_subroutine_type (&di, thisdie, nextdie);
1994 case TAG_array_type:
1995 dwarf_read_array_type (&di);
1997 case TAG_pointer_type:
1998 read_tag_pointer_type (&di);
2000 case TAG_string_type:
2001 read_tag_string_type (&di);
2004 new_symbol (&di, objfile);
2016 decode_line_numbers -- decode a line number table fragment
2020 static void decode_line_numbers (char *tblscan, char *tblend,
2021 long length, long base, long line, long pc)
2025 Translate the DWARF line number information to gdb form.
2027 The ".line" section contains one or more line number tables, one for
2028 each ".line" section from the objects that were linked.
2030 The AT_stmt_list attribute for each TAG_source_file entry in the
2031 ".debug" section contains the offset into the ".line" section for the
2032 start of the table for that file.
2034 The table itself has the following structure:
2036 <table length><base address><source statement entry>
2037 4 bytes 4 bytes 10 bytes
2039 The table length is the total size of the table, including the 4 bytes
2040 for the length information.
2042 The base address is the address of the first instruction generated
2043 for the source file.
2045 Each source statement entry has the following structure:
2047 <line number><statement position><address delta>
2048 4 bytes 2 bytes 4 bytes
2050 The line number is relative to the start of the file, starting with
2053 The statement position either -1 (0xFFFF) or the number of characters
2054 from the beginning of the line to the beginning of the statement.
2056 The address delta is the difference between the base address and
2057 the address of the first instruction for the statement.
2059 Note that we must copy the bytes from the packed table to our local
2060 variables before attempting to use them, to avoid alignment problems
2061 on some machines, particularly RISC processors.
2065 Does gdb expect the line numbers to be sorted? They are now by
2066 chance/luck, but are not required to be. (FIXME)
2068 The line with number 0 is unused, gdb apparently can discover the
2069 span of the last line some other way. How? (FIXME)
2073 decode_line_numbers (char *linetable)
2077 unsigned long length;
2082 if (linetable != NULL)
2084 tblscan = tblend = linetable;
2085 length = target_to_host (tblscan, SIZEOF_LINETBL_LENGTH, GET_UNSIGNED,
2087 tblscan += SIZEOF_LINETBL_LENGTH;
2089 base = target_to_host (tblscan, TARGET_FT_POINTER_SIZE (objfile),
2090 GET_UNSIGNED, current_objfile);
2091 tblscan += TARGET_FT_POINTER_SIZE (objfile);
2093 while (tblscan < tblend)
2095 line = target_to_host (tblscan, SIZEOF_LINETBL_LINENO, GET_UNSIGNED,
2097 tblscan += SIZEOF_LINETBL_LINENO + SIZEOF_LINETBL_STMT;
2098 pc = target_to_host (tblscan, SIZEOF_LINETBL_DELTA, GET_UNSIGNED,
2100 tblscan += SIZEOF_LINETBL_DELTA;
2104 record_line (current_subfile, line, pc);
2114 locval -- compute the value of a location attribute
2118 static int locval (struct dieinfo *dip)
2122 Given pointer to a string of bytes that define a location, compute
2123 the location and return the value.
2124 A location description containing no atoms indicates that the
2125 object is optimized out. The optimized_out flag is set for those,
2126 the return value is meaningless.
2128 When computing values involving the current value of the frame pointer,
2129 the value zero is used, which results in a value relative to the frame
2130 pointer, rather than the absolute value. This is what GDB wants
2133 When the result is a register number, the isreg flag is set, otherwise
2134 it is cleared. This is a kludge until we figure out a better
2135 way to handle the problem. Gdb's design does not mesh well with the
2136 DWARF notion of a location computing interpreter, which is a shame
2137 because the flexibility goes unused.
2141 Note that stack[0] is unused except as a default error return.
2142 Note that stack overflow is not yet handled.
2146 locval (struct dieinfo *dip)
2148 unsigned short nbytes;
2149 unsigned short locsize;
2150 auto long stack[64];
2157 loc = dip->at_location;
2158 nbytes = attribute_size (AT_location);
2159 locsize = target_to_host (loc, nbytes, GET_UNSIGNED, current_objfile);
2161 end = loc + locsize;
2166 dip->optimized_out = 1;
2167 loc_value_size = TARGET_FT_LONG_SIZE (current_objfile);
2170 dip->optimized_out = 0;
2171 loc_atom_code = target_to_host (loc, SIZEOF_LOC_ATOM_CODE, GET_UNSIGNED,
2173 loc += SIZEOF_LOC_ATOM_CODE;
2174 switch (loc_atom_code)
2181 /* push register (number) */
2183 = DWARF_REG_TO_REGNUM (target_to_host (loc, loc_value_size,
2186 loc += loc_value_size;
2190 /* push value of register (number) */
2191 /* Actually, we compute the value as if register has 0, so the
2192 value ends up being the offset from that register. */
2194 dip->basereg = target_to_host (loc, loc_value_size, GET_UNSIGNED,
2196 loc += loc_value_size;
2197 stack[++stacki] = 0;
2200 /* push address (relocated address) */
2201 stack[++stacki] = target_to_host (loc, loc_value_size,
2202 GET_UNSIGNED, current_objfile);
2203 loc += loc_value_size;
2206 /* push constant (number) FIXME: signed or unsigned! */
2207 stack[++stacki] = target_to_host (loc, loc_value_size,
2208 GET_SIGNED, current_objfile);
2209 loc += loc_value_size;
2212 /* pop, deref and push 2 bytes (as a long) */
2213 complaint (&symfile_complaints,
2214 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%lx not handled",
2215 DIE_ID, DIE_NAME, stack[stacki]);
2217 case OP_DEREF4: /* pop, deref and push 4 bytes (as a long) */
2218 complaint (&symfile_complaints,
2219 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%lx not handled",
2220 DIE_ID, DIE_NAME, stack[stacki]);
2222 case OP_ADD: /* pop top 2 items, add, push result */
2223 stack[stacki - 1] += stack[stacki];
2228 return (stack[stacki]);
2235 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2239 static void read_ofile_symtab (struct partial_symtab *pst)
2243 When expanding a partial symbol table entry to a full symbol table
2244 entry, this is the function that gets called to read in the symbols
2245 for the compilation unit. A pointer to the newly constructed symtab,
2246 which is now the new first one on the objfile's symtab list, is
2247 stashed in the partial symbol table entry.
2251 read_ofile_symtab (struct partial_symtab *pst)
2253 struct cleanup *back_to;
2254 unsigned long lnsize;
2257 char lnsizedata[SIZEOF_LINETBL_LENGTH];
2259 abfd = pst->objfile->obfd;
2260 current_objfile = pst->objfile;
2262 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2263 unit, seek to the location in the file, and read in all the DIE's. */
2266 dbsize = DBLENGTH (pst);
2267 dbbase = xmalloc (dbsize);
2268 dbroff = DBROFF (pst);
2269 foffset = DBFOFF (pst) + dbroff;
2270 base_section_offsets = pst->section_offsets;
2271 baseaddr = ANOFFSET (pst->section_offsets, 0);
2272 if (bfd_seek (abfd, foffset, SEEK_SET) ||
2273 (bfd_bread (dbbase, dbsize, abfd) != dbsize))
2276 error ("can't read DWARF data");
2278 back_to = make_cleanup (xfree, dbbase);
2280 /* If there is a line number table associated with this compilation unit
2281 then read the size of this fragment in bytes, from the fragment itself.
2282 Allocate a buffer for the fragment and read it in for future
2288 if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) ||
2289 (bfd_bread (lnsizedata, sizeof (lnsizedata), abfd)
2290 != sizeof (lnsizedata)))
2292 error ("can't read DWARF line number table size");
2294 lnsize = target_to_host (lnsizedata, SIZEOF_LINETBL_LENGTH,
2295 GET_UNSIGNED, pst->objfile);
2296 lnbase = xmalloc (lnsize);
2297 if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) ||
2298 (bfd_bread (lnbase, lnsize, abfd) != lnsize))
2301 error ("can't read DWARF line numbers");
2303 make_cleanup (xfree, lnbase);
2306 process_dies (dbbase, dbbase + dbsize, pst->objfile);
2307 do_cleanups (back_to);
2308 current_objfile = NULL;
2309 pst->symtab = pst->objfile->symtabs;
2316 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2320 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2324 Called once for each partial symbol table entry that needs to be
2325 expanded into a full symbol table entry.
2330 psymtab_to_symtab_1 (struct partial_symtab *pst)
2333 struct cleanup *old_chain;
2339 warning ("psymtab for %s already read in. Shouldn't happen.",
2344 /* Read in all partial symtabs on which this one is dependent */
2345 for (i = 0; i < pst->number_of_dependencies; i++)
2347 if (!pst->dependencies[i]->readin)
2349 /* Inform about additional files that need to be read in. */
2352 fputs_filtered (" ", gdb_stdout);
2354 fputs_filtered ("and ", gdb_stdout);
2356 printf_filtered ("%s...",
2357 pst->dependencies[i]->filename);
2359 gdb_flush (gdb_stdout); /* Flush output */
2361 psymtab_to_symtab_1 (pst->dependencies[i]);
2364 if (DBLENGTH (pst)) /* Otherwise it's a dummy */
2367 old_chain = make_cleanup (really_free_pendings, 0);
2368 read_ofile_symtab (pst);
2371 printf_filtered ("%d DIE's, sorting...", diecount);
2373 gdb_flush (gdb_stdout);
2375 do_cleanups (old_chain);
2386 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2390 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2394 This is the DWARF support entry point for building a full symbol
2395 table entry from a partial symbol table entry. We are passed a
2396 pointer to the partial symbol table entry that needs to be expanded.
2401 dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2408 warning ("psymtab for %s already read in. Shouldn't happen.",
2413 if (DBLENGTH (pst) || pst->number_of_dependencies)
2415 /* Print the message now, before starting serious work, to avoid
2416 disconcerting pauses. */
2419 printf_filtered ("Reading in symbols for %s...",
2421 gdb_flush (gdb_stdout);
2424 psymtab_to_symtab_1 (pst);
2426 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2427 we need to do an equivalent or is this something peculiar to
2429 Match with global symbols. This only needs to be done once,
2430 after all of the symtabs and dependencies have been read in.
2432 scan_file_globals (pst->objfile);
2435 /* Finish up the verbose info message. */
2438 printf_filtered ("done.\n");
2439 gdb_flush (gdb_stdout);
2450 add_enum_psymbol -- add enumeration members to partial symbol table
2454 Given pointer to a DIE that is known to be for an enumeration,
2455 extract the symbolic names of the enumeration members and add
2456 partial symbols for them.
2460 add_enum_psymbol (struct dieinfo *dip, struct objfile *objfile)
2464 unsigned short blocksz;
2467 scan = dip->at_element_list;
2470 if (dip->short_element_list)
2472 nbytes = attribute_size (AT_short_element_list);
2476 nbytes = attribute_size (AT_element_list);
2478 blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile);
2480 listend = scan + blocksz;
2481 while (scan < listend)
2483 scan += TARGET_FT_LONG_SIZE (objfile);
2484 add_psymbol_to_list (scan, strlen (scan), VAR_DOMAIN, LOC_CONST,
2485 &objfile->static_psymbols, 0, 0, cu_language,
2487 scan += strlen (scan) + 1;
2496 add_partial_symbol -- add symbol to partial symbol table
2500 Given a DIE, if it is one of the types that we want to
2501 add to a partial symbol table, finish filling in the die info
2502 and then add a partial symbol table entry for it.
2506 The caller must ensure that the DIE has a valid name attribute.
2510 add_partial_symbol (struct dieinfo *dip, struct objfile *objfile)
2512 switch (dip->die_tag)
2514 case TAG_global_subroutine:
2515 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2516 VAR_DOMAIN, LOC_BLOCK,
2517 &objfile->global_psymbols,
2518 0, dip->at_low_pc, cu_language, objfile);
2520 case TAG_global_variable:
2521 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2522 VAR_DOMAIN, LOC_STATIC,
2523 &objfile->global_psymbols,
2524 0, 0, cu_language, objfile);
2526 case TAG_subroutine:
2527 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2528 VAR_DOMAIN, LOC_BLOCK,
2529 &objfile->static_psymbols,
2530 0, dip->at_low_pc, cu_language, objfile);
2532 case TAG_local_variable:
2533 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2534 VAR_DOMAIN, LOC_STATIC,
2535 &objfile->static_psymbols,
2536 0, 0, cu_language, objfile);
2539 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2540 VAR_DOMAIN, LOC_TYPEDEF,
2541 &objfile->static_psymbols,
2542 0, 0, cu_language, objfile);
2544 case TAG_class_type:
2545 case TAG_structure_type:
2546 case TAG_union_type:
2547 case TAG_enumeration_type:
2548 /* Do not add opaque aggregate definitions to the psymtab. */
2549 if (!dip->has_at_byte_size)
2551 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2552 STRUCT_DOMAIN, LOC_TYPEDEF,
2553 &objfile->static_psymbols,
2554 0, 0, cu_language, objfile);
2555 if (cu_language == language_cplus)
2557 /* For C++, these implicitly act as typedefs as well. */
2558 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2559 VAR_DOMAIN, LOC_TYPEDEF,
2560 &objfile->static_psymbols,
2561 0, 0, cu_language, objfile);
2571 scan_partial_symbols -- scan DIE's within a single compilation unit
2575 Process the DIE's within a single compilation unit, looking for
2576 interesting DIE's that contribute to the partial symbol table entry
2577 for this compilation unit.
2581 There are some DIE's that may appear both at file scope and within
2582 the scope of a function. We are only interested in the ones at file
2583 scope, and the only way to tell them apart is to keep track of the
2584 scope. For example, consider the test case:
2589 for which the relevant DWARF segment has the structure:
2592 0x23 global subrtn sibling 0x9b
2594 fund_type FT_integer
2599 0x23 local var sibling 0x97
2601 fund_type FT_integer
2602 location OP_BASEREG 0xe
2609 0x1d local var sibling 0xb8
2611 fund_type FT_integer
2612 location OP_ADDR 0x800025dc
2617 We want to include the symbol 'i' in the partial symbol table, but
2618 not the symbol 'j'. In essence, we want to skip all the dies within
2619 the scope of a TAG_global_subroutine DIE.
2621 Don't attempt to add anonymous structures or unions since they have
2622 no name. Anonymous enumerations however are processed, because we
2623 want to extract their member names (the check for a tag name is
2626 Also, for variables and subroutines, check that this is the place
2627 where the actual definition occurs, rather than just a reference
2635 scan_partial_symbols (char *thisdie, char *enddie, struct objfile *objfile)
2641 while (thisdie < enddie)
2643 basicdieinfo (&di, thisdie, objfile);
2644 if (di.die_length < SIZEOF_DIE_LENGTH)
2650 nextdie = thisdie + di.die_length;
2651 /* To avoid getting complete die information for every die, we
2652 only do it (below) for the cases we are interested in. */
2655 case TAG_global_subroutine:
2656 case TAG_subroutine:
2657 completedieinfo (&di, objfile);
2658 if (di.at_name && (di.has_at_low_pc || di.at_location))
2660 add_partial_symbol (&di, objfile);
2661 /* If there is a sibling attribute, adjust the nextdie
2662 pointer to skip the entire scope of the subroutine.
2663 Apply some sanity checking to make sure we don't
2664 overrun or underrun the range of remaining DIE's */
2665 if (di.at_sibling != 0)
2667 temp = dbbase + di.at_sibling - dbroff;
2668 if ((temp < thisdie) || (temp >= enddie))
2670 bad_die_ref_complaint (DIE_ID, DIE_NAME,
2680 case TAG_global_variable:
2681 case TAG_local_variable:
2682 completedieinfo (&di, objfile);
2683 if (di.at_name && (di.has_at_low_pc || di.at_location))
2685 add_partial_symbol (&di, objfile);
2689 case TAG_class_type:
2690 case TAG_structure_type:
2691 case TAG_union_type:
2692 completedieinfo (&di, objfile);
2695 add_partial_symbol (&di, objfile);
2698 case TAG_enumeration_type:
2699 completedieinfo (&di, objfile);
2702 add_partial_symbol (&di, objfile);
2704 add_enum_psymbol (&di, objfile);
2716 scan_compilation_units -- build a psymtab entry for each compilation
2720 This is the top level dwarf parsing routine for building partial
2723 It scans from the beginning of the DWARF table looking for the first
2724 TAG_compile_unit DIE, and then follows the sibling chain to locate
2725 each additional TAG_compile_unit DIE.
2727 For each TAG_compile_unit DIE it creates a partial symtab structure,
2728 calls a subordinate routine to collect all the compilation unit's
2729 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2730 new partial symtab structure into the partial symbol table. It also
2731 records the appropriate information in the partial symbol table entry
2732 to allow the chunk of DIE's and line number table for this compilation
2733 unit to be located and re-read later, to generate a complete symbol
2734 table entry for the compilation unit.
2736 Thus it effectively partitions up a chunk of DIE's for multiple
2737 compilation units into smaller DIE chunks and line number tables,
2738 and associates them with a partial symbol table entry.
2742 If any compilation unit has no line number table associated with
2743 it for some reason (a missing at_stmt_list attribute, rather than
2744 just one with a value of zero, which is valid) then we ensure that
2745 the recorded file offset is zero so that the routine which later
2746 reads line number table fragments knows that there is no fragment
2756 scan_compilation_units (char *thisdie, char *enddie, file_ptr dbfoff,
2757 file_ptr lnoffset, struct objfile *objfile)
2761 struct partial_symtab *pst;
2764 file_ptr curlnoffset;
2766 while (thisdie < enddie)
2768 basicdieinfo (&di, thisdie, objfile);
2769 if (di.die_length < SIZEOF_DIE_LENGTH)
2773 else if (di.die_tag != TAG_compile_unit)
2775 nextdie = thisdie + di.die_length;
2779 completedieinfo (&di, objfile);
2780 set_cu_language (&di);
2781 if (di.at_sibling != 0)
2783 nextdie = dbbase + di.at_sibling - dbroff;
2787 nextdie = thisdie + di.die_length;
2789 curoff = thisdie - dbbase;
2790 culength = nextdie - thisdie;
2791 curlnoffset = di.has_at_stmt_list ? lnoffset + di.at_stmt_list : 0;
2793 /* First allocate a new partial symbol table structure */
2795 pst = start_psymtab_common (objfile, base_section_offsets,
2796 di.at_name, di.at_low_pc,
2797 objfile->global_psymbols.next,
2798 objfile->static_psymbols.next);
2800 pst->texthigh = di.at_high_pc;
2801 pst->read_symtab_private = (char *)
2802 obstack_alloc (&objfile->objfile_obstack,
2803 sizeof (struct dwfinfo));
2804 DBFOFF (pst) = dbfoff;
2805 DBROFF (pst) = curoff;
2806 DBLENGTH (pst) = culength;
2807 LNFOFF (pst) = curlnoffset;
2808 pst->read_symtab = dwarf_psymtab_to_symtab;
2810 /* Now look for partial symbols */
2812 scan_partial_symbols (thisdie + di.die_length, nextdie, objfile);
2814 pst->n_global_syms = objfile->global_psymbols.next -
2815 (objfile->global_psymbols.list + pst->globals_offset);
2816 pst->n_static_syms = objfile->static_psymbols.next -
2817 (objfile->static_psymbols.list + pst->statics_offset);
2818 sort_pst_symbols (pst);
2819 /* If there is already a psymtab or symtab for a file of this name,
2820 remove it. (If there is a symtab, more drastic things also
2821 happen.) This happens in VxWorks. */
2822 free_named_symtabs (pst->filename);
2832 new_symbol -- make a symbol table entry for a new symbol
2836 static struct symbol *new_symbol (struct dieinfo *dip,
2837 struct objfile *objfile)
2841 Given a pointer to a DWARF information entry, figure out if we need
2842 to make a symbol table entry for it, and if so, create a new entry
2843 and return a pointer to it.
2846 static struct symbol *
2847 new_symbol (struct dieinfo *dip, struct objfile *objfile)
2849 struct symbol *sym = NULL;
2851 if (dip->at_name != NULL)
2853 sym = (struct symbol *) obstack_alloc (&objfile->objfile_obstack,
2854 sizeof (struct symbol));
2855 OBJSTAT (objfile, n_syms++);
2856 memset (sym, 0, sizeof (struct symbol));
2857 /* default assumptions */
2858 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2859 SYMBOL_CLASS (sym) = LOC_STATIC;
2860 SYMBOL_TYPE (sym) = decode_die_type (dip);
2862 /* If this symbol is from a C++ compilation, then attempt to cache the
2863 demangled form for future reference. This is a typical time versus
2864 space tradeoff, that was decided in favor of time because it sped up
2865 C++ symbol lookups by a factor of about 20. */
2867 SYMBOL_LANGUAGE (sym) = cu_language;
2868 SYMBOL_SET_NAMES (sym, dip->at_name, strlen (dip->at_name), objfile);
2869 switch (dip->die_tag)
2872 SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc;
2873 SYMBOL_CLASS (sym) = LOC_LABEL;
2875 case TAG_global_subroutine:
2876 case TAG_subroutine:
2877 SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc;
2878 SYMBOL_TYPE (sym) = lookup_function_type (SYMBOL_TYPE (sym));
2879 if (dip->at_prototyped)
2880 TYPE_FLAGS (SYMBOL_TYPE (sym)) |= TYPE_FLAG_PROTOTYPED;
2881 SYMBOL_CLASS (sym) = LOC_BLOCK;
2882 if (dip->die_tag == TAG_global_subroutine)
2884 add_symbol_to_list (sym, &global_symbols);
2888 add_symbol_to_list (sym, list_in_scope);
2891 case TAG_global_variable:
2892 if (dip->at_location != NULL)
2894 SYMBOL_VALUE_ADDRESS (sym) = locval (dip);
2895 add_symbol_to_list (sym, &global_symbols);
2896 SYMBOL_CLASS (sym) = LOC_STATIC;
2897 SYMBOL_VALUE (sym) += baseaddr;
2900 case TAG_local_variable:
2901 if (dip->at_location != NULL)
2903 int loc = locval (dip);
2904 if (dip->optimized_out)
2906 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT;
2908 else if (dip->isreg)
2910 SYMBOL_CLASS (sym) = LOC_REGISTER;
2912 else if (dip->offreg)
2914 SYMBOL_CLASS (sym) = LOC_BASEREG;
2915 SYMBOL_BASEREG (sym) = dip->basereg;
2919 SYMBOL_CLASS (sym) = LOC_STATIC;
2920 SYMBOL_VALUE (sym) += baseaddr;
2922 if (SYMBOL_CLASS (sym) == LOC_STATIC)
2924 /* LOC_STATIC address class MUST use SYMBOL_VALUE_ADDRESS,
2925 which may store to a bigger location than SYMBOL_VALUE. */
2926 SYMBOL_VALUE_ADDRESS (sym) = loc;
2930 SYMBOL_VALUE (sym) = loc;
2932 add_symbol_to_list (sym, list_in_scope);
2935 case TAG_formal_parameter:
2936 if (dip->at_location != NULL)
2938 SYMBOL_VALUE (sym) = locval (dip);
2940 add_symbol_to_list (sym, list_in_scope);
2943 SYMBOL_CLASS (sym) = LOC_REGPARM;
2945 else if (dip->offreg)
2947 SYMBOL_CLASS (sym) = LOC_BASEREG_ARG;
2948 SYMBOL_BASEREG (sym) = dip->basereg;
2952 SYMBOL_CLASS (sym) = LOC_ARG;
2955 case TAG_unspecified_parameters:
2956 /* From varargs functions; gdb doesn't seem to have any interest in
2957 this information, so just ignore it for now. (FIXME?) */
2959 case TAG_class_type:
2960 case TAG_structure_type:
2961 case TAG_union_type:
2962 case TAG_enumeration_type:
2963 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
2964 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
2965 add_symbol_to_list (sym, list_in_scope);
2968 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
2969 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2970 add_symbol_to_list (sym, list_in_scope);
2973 /* Not a tag we recognize. Hopefully we aren't processing trash
2974 data, but since we must specifically ignore things we don't
2975 recognize, there is nothing else we should do at this point. */
2986 synthesize_typedef -- make a symbol table entry for a "fake" typedef
2990 static void synthesize_typedef (struct dieinfo *dip,
2991 struct objfile *objfile,
2996 Given a pointer to a DWARF information entry, synthesize a typedef
2997 for the name in the DIE, using the specified type.
2999 This is used for C++ class, structs, unions, and enumerations to
3000 set up the tag name as a type.
3005 synthesize_typedef (struct dieinfo *dip, struct objfile *objfile,
3008 struct symbol *sym = NULL;
3010 if (dip->at_name != NULL)
3012 sym = (struct symbol *)
3013 obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol));
3014 OBJSTAT (objfile, n_syms++);
3015 memset (sym, 0, sizeof (struct symbol));
3016 DEPRECATED_SYMBOL_NAME (sym) = create_name (dip->at_name,
3017 &objfile->objfile_obstack);
3018 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language);
3019 SYMBOL_TYPE (sym) = type;
3020 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
3021 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
3022 add_symbol_to_list (sym, list_in_scope);
3030 decode_mod_fund_type -- decode a modified fundamental type
3034 static struct type *decode_mod_fund_type (char *typedata)
3038 Decode a block of data containing a modified fundamental
3039 type specification. TYPEDATA is a pointer to the block,
3040 which starts with a length containing the size of the rest
3041 of the block. At the end of the block is a fundmental type
3042 code value that gives the fundamental type. Everything
3043 in between are type modifiers.
3045 We simply compute the number of modifiers and call the general
3046 function decode_modified_type to do the actual work.
3049 static struct type *
3050 decode_mod_fund_type (char *typedata)
3052 struct type *typep = NULL;
3053 unsigned short modcount;
3056 /* Get the total size of the block, exclusive of the size itself */
3058 nbytes = attribute_size (AT_mod_fund_type);
3059 modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile);
3062 /* Deduct the size of the fundamental type bytes at the end of the block. */
3064 modcount -= attribute_size (AT_fund_type);
3066 /* Now do the actual decoding */
3068 typep = decode_modified_type (typedata, modcount, AT_mod_fund_type);
3076 decode_mod_u_d_type -- decode a modified user defined type
3080 static struct type *decode_mod_u_d_type (char *typedata)
3084 Decode a block of data containing a modified user defined
3085 type specification. TYPEDATA is a pointer to the block,
3086 which consists of a two byte length, containing the size
3087 of the rest of the block. At the end of the block is a
3088 four byte value that gives a reference to a user defined type.
3089 Everything in between are type modifiers.
3091 We simply compute the number of modifiers and call the general
3092 function decode_modified_type to do the actual work.
3095 static struct type *
3096 decode_mod_u_d_type (char *typedata)
3098 struct type *typep = NULL;
3099 unsigned short modcount;
3102 /* Get the total size of the block, exclusive of the size itself */
3104 nbytes = attribute_size (AT_mod_u_d_type);
3105 modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile);
3108 /* Deduct the size of the reference type bytes at the end of the block. */
3110 modcount -= attribute_size (AT_user_def_type);
3112 /* Now do the actual decoding */
3114 typep = decode_modified_type (typedata, modcount, AT_mod_u_d_type);
3122 decode_modified_type -- decode modified user or fundamental type
3126 static struct type *decode_modified_type (char *modifiers,
3127 unsigned short modcount, int mtype)
3131 Decode a modified type, either a modified fundamental type or
3132 a modified user defined type. MODIFIERS is a pointer to the
3133 block of bytes that define MODCOUNT modifiers. Immediately
3134 following the last modifier is a short containing the fundamental
3135 type or a long containing the reference to the user defined
3136 type. Which one is determined by MTYPE, which is either
3137 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3138 type we are generating.
3140 We call ourself recursively to generate each modified type,`
3141 until MODCOUNT reaches zero, at which point we have consumed
3142 all the modifiers and generate either the fundamental type or
3143 user defined type. When the recursion unwinds, each modifier
3144 is applied in turn to generate the full modified type.
3148 If we find a modifier that we don't recognize, and it is not one
3149 of those reserved for application specific use, then we issue a
3150 warning and simply ignore the modifier.
3154 We currently ignore MOD_const and MOD_volatile. (FIXME)
3158 static struct type *
3159 decode_modified_type (char *modifiers, unsigned int modcount, int mtype)
3161 struct type *typep = NULL;
3162 unsigned short fundtype;
3171 case AT_mod_fund_type:
3172 nbytes = attribute_size (AT_fund_type);
3173 fundtype = target_to_host (modifiers, nbytes, GET_UNSIGNED,
3175 typep = decode_fund_type (fundtype);
3177 case AT_mod_u_d_type:
3178 nbytes = attribute_size (AT_user_def_type);
3179 die_ref = target_to_host (modifiers, nbytes, GET_UNSIGNED,
3181 typep = lookup_utype (die_ref);
3184 typep = alloc_utype (die_ref, NULL);
3188 complaint (&symfile_complaints,
3189 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)",
3190 DIE_ID, DIE_NAME, mtype);
3191 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3197 modifier = *modifiers++;
3198 typep = decode_modified_type (modifiers, --modcount, mtype);
3201 case MOD_pointer_to:
3202 typep = lookup_pointer_type (typep);
3204 case MOD_reference_to:
3205 typep = lookup_reference_type (typep);
3208 complaint (&symfile_complaints,
3209 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", DIE_ID,
3210 DIE_NAME); /* FIXME */
3213 complaint (&symfile_complaints,
3214 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored",
3215 DIE_ID, DIE_NAME); /* FIXME */
3218 if (!(MOD_lo_user <= (unsigned char) modifier))
3220 /* This part of the test would always be true, and it triggers a compiler
3222 && (unsigned char) modifier <= MOD_hi_user))
3225 complaint (&symfile_complaints,
3226 "DIE @ 0x%x \"%s\", unknown type modifier %u", DIE_ID,
3227 DIE_NAME, modifier);
3239 decode_fund_type -- translate basic DWARF type to gdb base type
3243 Given an integer that is one of the fundamental DWARF types,
3244 translate it to one of the basic internal gdb types and return
3245 a pointer to the appropriate gdb type (a "struct type *").
3249 For robustness, if we are asked to translate a fundamental
3250 type that we are unprepared to deal with, we return int so
3251 callers can always depend upon a valid type being returned,
3252 and so gdb may at least do something reasonable by default.
3253 If the type is not in the range of those types defined as
3254 application specific types, we also issue a warning.
3257 static struct type *
3258 decode_fund_type (unsigned int fundtype)
3260 struct type *typep = NULL;
3266 typep = dwarf_fundamental_type (current_objfile, FT_VOID);
3269 case FT_boolean: /* Was FT_set in AT&T version */
3270 typep = dwarf_fundamental_type (current_objfile, FT_BOOLEAN);
3273 case FT_pointer: /* (void *) */
3274 typep = dwarf_fundamental_type (current_objfile, FT_VOID);
3275 typep = lookup_pointer_type (typep);
3279 typep = dwarf_fundamental_type (current_objfile, FT_CHAR);
3282 case FT_signed_char:
3283 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_CHAR);
3286 case FT_unsigned_char:
3287 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_CHAR);
3291 typep = dwarf_fundamental_type (current_objfile, FT_SHORT);
3294 case FT_signed_short:
3295 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_SHORT);
3298 case FT_unsigned_short:
3299 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_SHORT);
3303 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3306 case FT_signed_integer:
3307 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_INTEGER);
3310 case FT_unsigned_integer:
3311 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_INTEGER);
3315 typep = dwarf_fundamental_type (current_objfile, FT_LONG);
3318 case FT_signed_long:
3319 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG);
3322 case FT_unsigned_long:
3323 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG);
3327 typep = dwarf_fundamental_type (current_objfile, FT_LONG_LONG);
3330 case FT_signed_long_long:
3331 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG_LONG);
3334 case FT_unsigned_long_long:
3335 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG_LONG);
3339 typep = dwarf_fundamental_type (current_objfile, FT_FLOAT);
3342 case FT_dbl_prec_float:
3343 typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_FLOAT);
3346 case FT_ext_prec_float:
3347 typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_FLOAT);
3351 typep = dwarf_fundamental_type (current_objfile, FT_COMPLEX);
3354 case FT_dbl_prec_complex:
3355 typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_COMPLEX);
3358 case FT_ext_prec_complex:
3359 typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_COMPLEX);
3366 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3367 if (!(FT_lo_user <= fundtype && fundtype <= FT_hi_user))
3369 complaint (&symfile_complaints,
3370 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x",
3371 DIE_ID, DIE_NAME, fundtype);
3382 create_name -- allocate a fresh copy of a string on an obstack
3386 Given a pointer to a string and a pointer to an obstack, allocates
3387 a fresh copy of the string on the specified obstack.
3392 create_name (char *name, struct obstack *obstackp)
3397 length = strlen (name) + 1;
3398 newname = (char *) obstack_alloc (obstackp, length);
3399 strcpy (newname, name);
3407 basicdieinfo -- extract the minimal die info from raw die data
3411 void basicdieinfo (char *diep, struct dieinfo *dip,
3412 struct objfile *objfile)
3416 Given a pointer to raw DIE data, and a pointer to an instance of a
3417 die info structure, this function extracts the basic information
3418 from the DIE data required to continue processing this DIE, along
3419 with some bookkeeping information about the DIE.
3421 The information we absolutely must have includes the DIE tag,
3422 and the DIE length. If we need the sibling reference, then we
3423 will have to call completedieinfo() to process all the remaining
3426 Note that since there is no guarantee that the data is properly
3427 aligned in memory for the type of access required (indirection
3428 through anything other than a char pointer), and there is no
3429 guarantee that it is in the same byte order as the gdb host,
3430 we call a function which deals with both alignment and byte
3431 swapping issues. Possibly inefficient, but quite portable.
3433 We also take care of some other basic things at this point, such
3434 as ensuring that the instance of the die info structure starts
3435 out completely zero'd and that curdie is initialized for use
3436 in error reporting if we have a problem with the current die.
3440 All DIE's must have at least a valid length, thus the minimum
3441 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3442 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3443 are forced to be TAG_padding DIES.
3445 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3446 that if a padding DIE is used for alignment and the amount needed is
3447 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3448 enough to align to the next alignment boundry.
3450 We do some basic sanity checking here, such as verifying that the
3451 length of the die would not cause it to overrun the recorded end of
3452 the buffer holding the DIE info. If we find a DIE that is either
3453 too small or too large, we force it's length to zero which should
3454 cause the caller to take appropriate action.
3458 basicdieinfo (struct dieinfo *dip, char *diep, struct objfile *objfile)
3461 memset (dip, 0, sizeof (struct dieinfo));
3463 dip->die_ref = dbroff + (diep - dbbase);
3464 dip->die_length = target_to_host (diep, SIZEOF_DIE_LENGTH, GET_UNSIGNED,
3466 if ((dip->die_length < SIZEOF_DIE_LENGTH) ||
3467 ((diep + dip->die_length) > (dbbase + dbsize)))
3469 complaint (&symfile_complaints,
3470 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%ld bytes)",
3471 DIE_ID, DIE_NAME, dip->die_length);
3472 dip->die_length = 0;
3474 else if (dip->die_length < (SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG))
3476 dip->die_tag = TAG_padding;
3480 diep += SIZEOF_DIE_LENGTH;
3481 dip->die_tag = target_to_host (diep, SIZEOF_DIE_TAG, GET_UNSIGNED,
3490 completedieinfo -- finish reading the information for a given DIE
3494 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3498 Given a pointer to an already partially initialized die info structure,
3499 scan the raw DIE data and finish filling in the die info structure
3500 from the various attributes found.
3502 Note that since there is no guarantee that the data is properly
3503 aligned in memory for the type of access required (indirection
3504 through anything other than a char pointer), and there is no
3505 guarantee that it is in the same byte order as the gdb host,
3506 we call a function which deals with both alignment and byte
3507 swapping issues. Possibly inefficient, but quite portable.
3511 Each time we are called, we increment the diecount variable, which
3512 keeps an approximate count of the number of dies processed for
3513 each compilation unit. This information is presented to the user
3514 if the info_verbose flag is set.
3519 completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3521 char *diep; /* Current pointer into raw DIE data */
3522 char *end; /* Terminate DIE scan here */
3523 unsigned short attr; /* Current attribute being scanned */
3524 unsigned short form; /* Form of the attribute */
3525 int nbytes; /* Size of next field to read */
3529 end = diep + dip->die_length;
3530 diep += SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG;
3533 attr = target_to_host (diep, SIZEOF_ATTRIBUTE, GET_UNSIGNED, objfile);
3534 diep += SIZEOF_ATTRIBUTE;
3535 nbytes = attribute_size (attr);
3538 complaint (&symfile_complaints,
3539 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes",
3547 dip->at_fund_type = target_to_host (diep, nbytes, GET_UNSIGNED,
3551 dip->at_ordering = target_to_host (diep, nbytes, GET_UNSIGNED,
3555 dip->at_bit_offset = target_to_host (diep, nbytes, GET_UNSIGNED,
3559 dip->at_sibling = target_to_host (diep, nbytes, GET_UNSIGNED,
3563 dip->at_stmt_list = target_to_host (diep, nbytes, GET_UNSIGNED,
3565 dip->has_at_stmt_list = 1;
3568 dip->at_low_pc = target_to_host (diep, nbytes, GET_UNSIGNED,
3570 dip->at_low_pc += baseaddr;
3571 dip->has_at_low_pc = 1;
3574 dip->at_high_pc = target_to_host (diep, nbytes, GET_UNSIGNED,
3576 dip->at_high_pc += baseaddr;
3579 dip->at_language = target_to_host (diep, nbytes, GET_UNSIGNED,
3582 case AT_user_def_type:
3583 dip->at_user_def_type = target_to_host (diep, nbytes,
3584 GET_UNSIGNED, objfile);
3587 dip->at_byte_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3589 dip->has_at_byte_size = 1;
3592 dip->at_bit_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3596 dip->at_member = target_to_host (diep, nbytes, GET_UNSIGNED,
3600 dip->at_discr = target_to_host (diep, nbytes, GET_UNSIGNED,
3604 dip->at_location = diep;
3606 case AT_mod_fund_type:
3607 dip->at_mod_fund_type = diep;
3609 case AT_subscr_data:
3610 dip->at_subscr_data = diep;
3612 case AT_mod_u_d_type:
3613 dip->at_mod_u_d_type = diep;
3615 case AT_element_list:
3616 dip->at_element_list = diep;
3617 dip->short_element_list = 0;
3619 case AT_short_element_list:
3620 dip->at_element_list = diep;
3621 dip->short_element_list = 1;
3623 case AT_discr_value:
3624 dip->at_discr_value = diep;
3626 case AT_string_length:
3627 dip->at_string_length = diep;
3630 dip->at_name = diep;
3633 /* For now, ignore any "hostname:" portion, since gdb doesn't
3634 know how to deal with it. (FIXME). */
3635 dip->at_comp_dir = strrchr (diep, ':');
3636 if (dip->at_comp_dir != NULL)
3642 dip->at_comp_dir = diep;
3646 dip->at_producer = diep;
3648 case AT_start_scope:
3649 dip->at_start_scope = target_to_host (diep, nbytes, GET_UNSIGNED,
3652 case AT_stride_size:
3653 dip->at_stride_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3657 dip->at_src_info = target_to_host (diep, nbytes, GET_UNSIGNED,
3661 dip->at_prototyped = diep;
3664 /* Found an attribute that we are unprepared to handle. However
3665 it is specifically one of the design goals of DWARF that
3666 consumers should ignore unknown attributes. As long as the
3667 form is one that we recognize (so we know how to skip it),
3668 we can just ignore the unknown attribute. */
3671 form = FORM_FROM_ATTR (attr);
3685 diep += TARGET_FT_POINTER_SIZE (objfile);
3688 diep += 2 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile);
3691 diep += 4 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile);
3694 diep += strlen (diep) + 1;
3697 unknown_attribute_form_complaint (DIE_ID, DIE_NAME, form);
3708 target_to_host -- swap in target data to host
3712 target_to_host (char *from, int nbytes, int signextend,
3713 struct objfile *objfile)
3717 Given pointer to data in target format in FROM, a byte count for
3718 the size of the data in NBYTES, a flag indicating whether or not
3719 the data is signed in SIGNEXTEND, and a pointer to the current
3720 objfile in OBJFILE, convert the data to host format and return
3721 the converted value.
3725 FIXME: If we read data that is known to be signed, and expect to
3726 use it as signed data, then we need to explicitly sign extend the
3727 result until the bfd library is able to do this for us.
3729 FIXME: Would a 32 bit target ever need an 8 byte result?
3734 target_to_host (char *from, int nbytes, int signextend, /* FIXME: Unused */
3735 struct objfile *objfile)
3742 rtnval = bfd_get_64 (objfile->obfd, (bfd_byte *) from);
3745 rtnval = bfd_get_32 (objfile->obfd, (bfd_byte *) from);
3748 rtnval = bfd_get_16 (objfile->obfd, (bfd_byte *) from);
3751 rtnval = bfd_get_8 (objfile->obfd, (bfd_byte *) from);
3754 complaint (&symfile_complaints,
3755 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object",
3756 DIE_ID, DIE_NAME, nbytes);
3767 attribute_size -- compute size of data for a DWARF attribute
3771 static int attribute_size (unsigned int attr)
3775 Given a DWARF attribute in ATTR, compute the size of the first
3776 piece of data associated with this attribute and return that
3779 Returns -1 for unrecognized attributes.
3784 attribute_size (unsigned int attr)
3786 int nbytes; /* Size of next data for this attribute */
3787 unsigned short form; /* Form of the attribute */
3789 form = FORM_FROM_ATTR (attr);
3792 case FORM_STRING: /* A variable length field is next */
3795 case FORM_DATA2: /* Next 2 byte field is the data itself */
3796 case FORM_BLOCK2: /* Next 2 byte field is a block length */
3799 case FORM_DATA4: /* Next 4 byte field is the data itself */
3800 case FORM_BLOCK4: /* Next 4 byte field is a block length */
3801 case FORM_REF: /* Next 4 byte field is a DIE offset */
3804 case FORM_DATA8: /* Next 8 byte field is the data itself */
3807 case FORM_ADDR: /* Next field size is target sizeof(void *) */
3808 nbytes = TARGET_FT_POINTER_SIZE (objfile);
3811 unknown_attribute_form_complaint (DIE_ID, DIE_NAME, form);