1 /* DWARF debugging format support for GDB.
3 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003 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.
29 DWARF (also known as DWARF-1) is headed for obsoletion.
31 In gcc 3.2.1, these targets prefer dwarf-1:
33 i[34567]86-sequent-ptx4* # TD-R2
34 i[34567]86-sequent-sysv4* # TD-R2
35 i[34567]86-dg-dgux* # obsolete in gcc 3.2.1, to be removed in 3.3
37 mips-sni-sysv4 # TD-R2
38 sparc-hal-solaris2* # TD-R2
40 Configurations marked with "# TD-R2" are on Zach Weinberg's list
41 of "Target Deprecation, Round 2". This is a candidate list of
42 targets to be deprecated in gcc 3.3 and removed in gcc 3.4.
44 http://gcc.gnu.org/ml/gcc/2002-12/msg00702.html
46 gcc 2.95.3 had many configurations which prefer dwarf-1.
47 We may have to support dwarf-1 as long as we support gcc 2.95.3.
48 This could use more analysis.
50 DG/UX (Data General Unix) used dwarf-1 for its native format.
51 DG/UX uses gcc for its system C compiler, but they have their
52 own linker and their own debuggers.
54 Takis Psarogiannakopoulos has a complete gnu toolchain for DG/UX
55 with gcc 2.95.3, gdb 5.1, and debug formats of dwarf-2 and stabs.
56 For more info, see PR gdb/979 and PR gdb/1013; also:
58 http://sources.redhat.com/ml/gdb/2003-02/msg00074.html
60 There may be non-gcc compilers that still emit dwarf-1.
62 -- chastain 2003-02-04
67 FIXME: Do we need to generate dependencies in partial symtabs?
68 (Perhaps we don't need to).
70 FIXME: Resolve minor differences between what information we put in the
71 partial symbol table and what dbxread puts in. For example, we don't yet
72 put enum constants there. And dbxread seems to invent a lot of typedefs
73 we never see. Use the new printpsym command to see the partial symbol table
76 FIXME: Figure out a better way to tell gdb about the name of the function
77 contain the user's entry point (I.E. main())
79 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
80 other things to work on, if you get bored. :-)
89 #include "elf/dwarf.h"
92 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
94 #include "complaints.h"
97 #include "gdb_string.h"
99 /* Some macros to provide DIE info for complaints. */
101 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
102 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
104 /* Complaints that can be issued during DWARF debug info reading. */
107 bad_die_ref_complaint (int arg1, const char *arg2, int arg3)
109 complaint (&symfile_complaints,
110 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit",
115 unknown_attribute_form_complaint (int arg1, const char *arg2, int arg3)
117 complaint (&symfile_complaints,
118 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", arg1, arg2,
123 dup_user_type_definition_complaint (int arg1, const char *arg2)
125 complaint (&symfile_complaints,
126 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition",
131 bad_array_element_type_complaint (int arg1, const char *arg2, int arg3)
133 complaint (&symfile_complaints,
134 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", arg1,
138 typedef unsigned int DIE_REF; /* Reference to a DIE */
141 #define GCC_PRODUCER "GNU C "
144 #ifndef GPLUS_PRODUCER
145 #define GPLUS_PRODUCER "GNU C++ "
149 #define LCC_PRODUCER "NCR C/C++"
152 /* Flags to target_to_host() that tell whether or not the data object is
153 expected to be signed. Used, for example, when fetching a signed
154 integer in the target environment which is used as a signed integer
155 in the host environment, and the two environments have different sized
156 ints. In this case, *somebody* has to sign extend the smaller sized
159 #define GET_UNSIGNED 0 /* No sign extension required */
160 #define GET_SIGNED 1 /* Sign extension required */
162 /* Defines for things which are specified in the document "DWARF Debugging
163 Information Format" published by UNIX International, Programming Languages
164 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
166 #define SIZEOF_DIE_LENGTH 4
167 #define SIZEOF_DIE_TAG 2
168 #define SIZEOF_ATTRIBUTE 2
169 #define SIZEOF_FORMAT_SPECIFIER 1
170 #define SIZEOF_FMT_FT 2
171 #define SIZEOF_LINETBL_LENGTH 4
172 #define SIZEOF_LINETBL_LINENO 4
173 #define SIZEOF_LINETBL_STMT 2
174 #define SIZEOF_LINETBL_DELTA 4
175 #define SIZEOF_LOC_ATOM_CODE 1
177 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
179 /* Macros that return the sizes of various types of data in the target
182 FIXME: Currently these are just compile time constants (as they are in
183 other parts of gdb as well). They need to be able to get the right size
184 either from the bfd or possibly from the DWARF info. It would be nice if
185 the DWARF producer inserted DIES that describe the fundamental types in
186 the target environment into the DWARF info, similar to the way dbx stabs
187 producers produce information about their fundamental types. */
189 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
190 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
192 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
193 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
194 However, the Issue 2 DWARF specification from AT&T defines it as
195 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
196 For backwards compatibility with the AT&T compiler produced executables
197 we define AT_short_element_list for this variant. */
199 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
201 /* The DWARF debugging information consists of two major pieces,
202 one is a block of DWARF Information Entries (DIE's) and the other
203 is a line number table. The "struct dieinfo" structure contains
204 the information for a single DIE, the one currently being processed.
206 In order to make it easier to randomly access the attribute fields
207 of the current DIE, which are specifically unordered within the DIE,
208 each DIE is scanned and an instance of the "struct dieinfo"
209 structure is initialized.
211 Initialization is done in two levels. The first, done by basicdieinfo(),
212 just initializes those fields that are vital to deciding whether or not
213 to use this DIE, how to skip past it, etc. The second, done by the
214 function completedieinfo(), fills in the rest of the information.
216 Attributes which have block forms are not interpreted at the time
217 the DIE is scanned, instead we just save pointers to the start
218 of their value fields.
220 Some fields have a flag <name>_p that is set when the value of the
221 field is valid (I.E. we found a matching attribute in the DIE). Since
222 we may want to test for the presence of some attributes in the DIE,
223 such as AT_low_pc, without restricting the values of the field,
224 we need someway to note that we found such an attribute.
232 char *die; /* Pointer to the raw DIE data */
233 unsigned long die_length; /* Length of the raw DIE data */
234 DIE_REF die_ref; /* Offset of this DIE */
235 unsigned short die_tag; /* Tag for this DIE */
236 unsigned long at_padding;
237 unsigned long at_sibling;
240 unsigned short at_fund_type;
241 BLOCK *at_mod_fund_type;
242 unsigned long at_user_def_type;
243 BLOCK *at_mod_u_d_type;
244 unsigned short at_ordering;
245 BLOCK *at_subscr_data;
246 unsigned long at_byte_size;
247 unsigned short at_bit_offset;
248 unsigned long at_bit_size;
249 BLOCK *at_element_list;
250 unsigned long at_stmt_list;
252 CORE_ADDR at_high_pc;
253 unsigned long at_language;
254 unsigned long at_member;
255 unsigned long at_discr;
256 BLOCK *at_discr_value;
257 BLOCK *at_string_length;
260 unsigned long at_start_scope;
261 unsigned long at_stride_size;
262 unsigned long at_src_info;
264 unsigned int has_at_low_pc:1;
265 unsigned int has_at_stmt_list:1;
266 unsigned int has_at_byte_size:1;
267 unsigned int short_element_list:1;
269 /* Kludge to identify register variables */
273 /* Kludge to identify optimized out variables */
275 unsigned int optimized_out;
277 /* Kludge to identify basereg references.
278 Nonzero if we have an offset relative to a basereg. */
282 /* Kludge to identify which base register is it relative to. */
284 unsigned int basereg;
287 static int diecount; /* Approximate count of dies for compilation unit */
288 static struct dieinfo *curdie; /* For warnings and such */
290 static char *dbbase; /* Base pointer to dwarf info */
291 static int dbsize; /* Size of dwarf info in bytes */
292 static int dbroff; /* Relative offset from start of .debug section */
293 static char *lnbase; /* Base pointer to line section */
295 /* This value is added to each symbol value. FIXME: Generalize to
296 the section_offsets structure used by dbxread (once this is done,
297 pass the appropriate section number to end_symtab). */
298 static CORE_ADDR baseaddr; /* Add to each symbol value */
300 /* The section offsets used in the current psymtab or symtab. FIXME,
301 only used to pass one value (baseaddr) at the moment. */
302 static struct section_offsets *base_section_offsets;
304 /* We put a pointer to this structure in the read_symtab_private field
309 /* Always the absolute file offset to the start of the ".debug"
310 section for the file containing the DIE's being accessed. */
312 /* Relative offset from the start of the ".debug" section to the
313 first DIE to be accessed. When building the partial symbol
314 table, this value will be zero since we are accessing the
315 entire ".debug" section. When expanding a partial symbol
316 table entry, this value will be the offset to the first
317 DIE for the compilation unit containing the symbol that
318 triggers the expansion. */
320 /* The size of the chunk of DIE's being examined, in bytes. */
322 /* The absolute file offset to the line table fragment. Ignored
323 when building partial symbol tables, but used when expanding
324 them, and contains the absolute file offset to the fragment
325 of the ".line" section containing the line numbers for the
326 current compilation unit. */
330 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
331 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
332 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
333 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
335 /* The generic symbol table building routines have separate lists for
336 file scope symbols and all all other scopes (local scopes). So
337 we need to select the right one to pass to add_symbol_to_list().
338 We do it by keeping a pointer to the correct list in list_in_scope.
340 FIXME: The original dwarf code just treated the file scope as the first
341 local scope, and all other local scopes as nested local scopes, and worked
342 fine. Check to see if we really need to distinguish these in buildsym.c */
344 struct pending **list_in_scope = &file_symbols;
346 /* DIES which have user defined types or modified user defined types refer to
347 other DIES for the type information. Thus we need to associate the offset
348 of a DIE for a user defined type with a pointer to the type information.
350 Originally this was done using a simple but expensive algorithm, with an
351 array of unsorted structures, each containing an offset/type-pointer pair.
352 This array was scanned linearly each time a lookup was done. The result
353 was that gdb was spending over half it's startup time munging through this
354 array of pointers looking for a structure that had the right offset member.
356 The second attempt used the same array of structures, but the array was
357 sorted using qsort each time a new offset/type was recorded, and a binary
358 search was used to find the type pointer for a given DIE offset. This was
359 even slower, due to the overhead of sorting the array each time a new
360 offset/type pair was entered.
362 The third attempt uses a fixed size array of type pointers, indexed by a
363 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
364 we can divide any DIE offset by 4 to obtain a unique index into this fixed
365 size array. Since each element is a 4 byte pointer, it takes exactly as
366 much memory to hold this array as to hold the DWARF info for a given
367 compilation unit. But it gets freed as soon as we are done with it.
368 This has worked well in practice, as a reasonable tradeoff between memory
369 consumption and speed, without having to resort to much more complicated
372 static struct type **utypes; /* Pointer to array of user type pointers */
373 static int numutypes; /* Max number of user type pointers */
375 /* Maintain an array of referenced fundamental types for the current
376 compilation unit being read. For DWARF version 1, we have to construct
377 the fundamental types on the fly, since no information about the
378 fundamental types is supplied. Each such fundamental type is created by
379 calling a language dependent routine to create the type, and then a
380 pointer to that type is then placed in the array at the index specified
381 by it's FT_<TYPENAME> value. The array has a fixed size set by the
382 FT_NUM_MEMBERS compile time constant, which is the number of predefined
383 fundamental types gdb knows how to construct. */
385 static struct type *ftypes[FT_NUM_MEMBERS]; /* Fundamental types */
387 /* Record the language for the compilation unit which is currently being
388 processed. We know it once we have seen the TAG_compile_unit DIE,
389 and we need it while processing the DIE's for that compilation unit.
390 It is eventually saved in the symtab structure, but we don't finalize
391 the symtab struct until we have processed all the DIE's for the
392 compilation unit. We also need to get and save a pointer to the
393 language struct for this language, so we can call the language
394 dependent routines for doing things such as creating fundamental
397 static enum language cu_language;
398 static const struct language_defn *cu_language_defn;
400 /* Forward declarations of static functions so we don't have to worry
401 about ordering within this file. */
403 static void free_utypes (void *);
405 static int attribute_size (unsigned int);
407 static CORE_ADDR target_to_host (char *, int, int, struct objfile *);
409 static void add_enum_psymbol (struct dieinfo *, struct objfile *);
411 static void handle_producer (char *);
413 static void read_file_scope (struct dieinfo *, char *, char *,
416 static void read_func_scope (struct dieinfo *, char *, char *,
419 static void read_lexical_block_scope (struct dieinfo *, char *, char *,
422 static void scan_partial_symbols (char *, char *, struct objfile *);
424 static void scan_compilation_units (char *, char *, file_ptr, file_ptr,
427 static void add_partial_symbol (struct dieinfo *, struct objfile *);
429 static void basicdieinfo (struct dieinfo *, char *, struct objfile *);
431 static void completedieinfo (struct dieinfo *, struct objfile *);
433 static void dwarf_psymtab_to_symtab (struct partial_symtab *);
435 static void psymtab_to_symtab_1 (struct partial_symtab *);
437 static void read_ofile_symtab (struct partial_symtab *);
439 static void process_dies (char *, char *, struct objfile *);
441 static void read_structure_scope (struct dieinfo *, char *, char *,
444 static struct type *decode_array_element_type (char *);
446 static struct type *decode_subscript_data_item (char *, char *);
448 static void dwarf_read_array_type (struct dieinfo *);
450 static void read_tag_pointer_type (struct dieinfo *dip);
452 static void read_tag_string_type (struct dieinfo *dip);
454 static void read_subroutine_type (struct dieinfo *, char *, char *);
456 static void read_enumeration (struct dieinfo *, char *, char *,
459 static struct type *struct_type (struct dieinfo *, char *, char *,
462 static struct type *enum_type (struct dieinfo *, struct objfile *);
464 static void decode_line_numbers (char *);
466 static struct type *decode_die_type (struct dieinfo *);
468 static struct type *decode_mod_fund_type (char *);
470 static struct type *decode_mod_u_d_type (char *);
472 static struct type *decode_modified_type (char *, unsigned int, int);
474 static struct type *decode_fund_type (unsigned int);
476 static char *create_name (char *, struct obstack *);
478 static struct type *lookup_utype (DIE_REF);
480 static struct type *alloc_utype (DIE_REF, struct type *);
482 static struct symbol *new_symbol (struct dieinfo *, struct objfile *);
484 static void synthesize_typedef (struct dieinfo *, struct objfile *,
487 static int locval (struct dieinfo *);
489 static void set_cu_language (struct dieinfo *);
491 static struct type *dwarf_fundamental_type (struct objfile *, int);
498 dwarf_fundamental_type -- lookup or create a fundamental type
503 dwarf_fundamental_type (struct objfile *objfile, int typeid)
507 DWARF version 1 doesn't supply any fundamental type information,
508 so gdb has to construct such types. It has a fixed number of
509 fundamental types that it knows how to construct, which is the
510 union of all types that it knows how to construct for all languages
511 that it knows about. These are enumerated in gdbtypes.h.
513 As an example, assume we find a DIE that references a DWARF
514 fundamental type of FT_integer. We first look in the ftypes
515 array to see if we already have such a type, indexed by the
516 gdb internal value of FT_INTEGER. If so, we simply return a
517 pointer to that type. If not, then we ask an appropriate
518 language dependent routine to create a type FT_INTEGER, using
519 defaults reasonable for the current target machine, and install
520 that type in ftypes for future reference.
524 Pointer to a fundamental type.
529 dwarf_fundamental_type (struct objfile *objfile, int typeid)
531 if (typeid < 0 || typeid >= FT_NUM_MEMBERS)
533 error ("internal error - invalid fundamental type id %d", typeid);
536 /* Look for this particular type in the fundamental type vector. If one is
537 not found, create and install one appropriate for the current language
538 and the current target machine. */
540 if (ftypes[typeid] == NULL)
542 ftypes[typeid] = cu_language_defn->la_fund_type (objfile, typeid);
545 return (ftypes[typeid]);
552 set_cu_language -- set local copy of language for compilation unit
557 set_cu_language (struct dieinfo *dip)
561 Decode the language attribute for a compilation unit DIE and
562 remember what the language was. We use this at various times
563 when processing DIE's for a given compilation unit.
572 set_cu_language (struct dieinfo *dip)
574 switch (dip->at_language)
578 cu_language = language_c;
580 case LANG_C_PLUS_PLUS:
581 cu_language = language_cplus;
584 cu_language = language_m2;
588 cu_language = language_fortran;
594 /* We don't know anything special about these yet. */
595 cu_language = language_unknown;
598 /* If no at_language, try to deduce one from the filename */
599 cu_language = deduce_language_from_filename (dip->at_name);
602 cu_language_defn = language_def (cu_language);
609 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
613 void dwarf_build_psymtabs (struct objfile *objfile,
614 int mainline, file_ptr dbfoff, unsigned int dbfsize,
615 file_ptr lnoffset, unsigned int lnsize)
619 This function is called upon to build partial symtabs from files
620 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
622 It is passed a bfd* containing the DIES
623 and line number information, the corresponding filename for that
624 file, a base address for relocating the symbols, a flag indicating
625 whether or not this debugging information is from a "main symbol
626 table" rather than a shared library or dynamically linked file,
627 and file offset/size pairs for the DIE information and line number
637 dwarf_build_psymtabs (struct objfile *objfile, int mainline, file_ptr dbfoff,
638 unsigned int dbfsize, file_ptr lnoffset,
641 bfd *abfd = objfile->obfd;
642 struct cleanup *back_to;
644 current_objfile = objfile;
646 dbbase = xmalloc (dbsize);
648 if ((bfd_seek (abfd, dbfoff, SEEK_SET) != 0) ||
649 (bfd_bread (dbbase, dbsize, abfd) != dbsize))
652 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd));
654 back_to = make_cleanup (xfree, dbbase);
656 /* If we are reinitializing, or if we have never loaded syms yet, init.
657 Since we have no idea how many DIES we are looking at, we just guess
658 some arbitrary value. */
661 || (objfile->global_psymbols.size == 0
662 && objfile->static_psymbols.size == 0))
664 init_psymbol_list (objfile, 1024);
667 /* Save the relocation factor where everybody can see it. */
669 base_section_offsets = objfile->section_offsets;
670 baseaddr = ANOFFSET (objfile->section_offsets, 0);
672 /* Follow the compilation unit sibling chain, building a partial symbol
673 table entry for each one. Save enough information about each compilation
674 unit to locate the full DWARF information later. */
676 scan_compilation_units (dbbase, dbbase + dbsize, dbfoff, lnoffset, objfile);
678 do_cleanups (back_to);
679 current_objfile = NULL;
686 read_lexical_block_scope -- process all dies in a lexical block
690 static void read_lexical_block_scope (struct dieinfo *dip,
691 char *thisdie, char *enddie)
695 Process all the DIES contained within a lexical block scope.
696 Start a new scope, process the dies, and then close the scope.
701 read_lexical_block_scope (struct dieinfo *dip, char *thisdie, char *enddie,
702 struct objfile *objfile)
704 struct context_stack *new;
706 push_context (0, dip->at_low_pc);
707 process_dies (thisdie + dip->die_length, enddie, objfile);
708 new = pop_context ();
709 if (local_symbols != NULL)
711 finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
712 dip->at_high_pc, objfile);
714 local_symbols = new->locals;
721 lookup_utype -- look up a user defined type from die reference
725 static type *lookup_utype (DIE_REF die_ref)
729 Given a DIE reference, lookup the user defined type associated with
730 that DIE, if it has been registered already. If not registered, then
731 return NULL. Alloc_utype() can be called to register an empty
732 type for this reference, which will be filled in later when the
733 actual referenced DIE is processed.
737 lookup_utype (DIE_REF die_ref)
739 struct type *type = NULL;
742 utypeidx = (die_ref - dbroff) / 4;
743 if ((utypeidx < 0) || (utypeidx >= numutypes))
745 bad_die_ref_complaint (DIE_ID, DIE_NAME, die_ref);
749 type = *(utypes + utypeidx);
759 alloc_utype -- add a user defined type for die reference
763 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
767 Given a die reference DIE_REF, and a possible pointer to a user
768 defined type UTYPEP, register that this reference has a user
769 defined type and either use the specified type in UTYPEP or
770 make a new empty type that will be filled in later.
772 We should only be called after calling lookup_utype() to verify that
773 there is not currently a type registered for DIE_REF.
777 alloc_utype (DIE_REF die_ref, struct type *utypep)
782 utypeidx = (die_ref - dbroff) / 4;
783 typep = utypes + utypeidx;
784 if ((utypeidx < 0) || (utypeidx >= numutypes))
786 utypep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
787 bad_die_ref_complaint (DIE_ID, DIE_NAME, die_ref);
789 else if (*typep != NULL)
792 complaint (&symfile_complaints,
793 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation",
800 utypep = alloc_type (current_objfile);
811 free_utypes -- free the utypes array and reset pointer & count
815 static void free_utypes (void *dummy)
819 Called via do_cleanups to free the utypes array, reset the pointer to NULL,
820 and set numutypes back to zero. This ensures that the utypes does not get
821 referenced after being freed.
825 free_utypes (void *dummy)
837 decode_die_type -- return a type for a specified die
841 static struct type *decode_die_type (struct dieinfo *dip)
845 Given a pointer to a die information structure DIP, decode the
846 type of the die and return a pointer to the decoded type. All
847 dies without specific types default to type int.
851 decode_die_type (struct dieinfo *dip)
853 struct type *type = NULL;
855 if (dip->at_fund_type != 0)
857 type = decode_fund_type (dip->at_fund_type);
859 else if (dip->at_mod_fund_type != NULL)
861 type = decode_mod_fund_type (dip->at_mod_fund_type);
863 else if (dip->at_user_def_type)
865 type = lookup_utype (dip->at_user_def_type);
868 type = alloc_utype (dip->at_user_def_type, NULL);
871 else if (dip->at_mod_u_d_type)
873 type = decode_mod_u_d_type (dip->at_mod_u_d_type);
877 type = dwarf_fundamental_type (current_objfile, FT_VOID);
886 struct_type -- compute and return the type for a struct or union
890 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
891 char *enddie, struct objfile *objfile)
895 Given pointer to a die information structure for a die which
896 defines a union or structure (and MUST define one or the other),
897 and pointers to the raw die data that define the range of dies which
898 define the members, compute and return the user defined type for the
903 struct_type (struct dieinfo *dip, char *thisdie, char *enddie,
904 struct objfile *objfile)
909 struct nextfield *next;
912 struct nextfield *list = NULL;
913 struct nextfield *new;
920 type = lookup_utype (dip->die_ref);
923 /* No forward references created an empty type, so install one now */
924 type = alloc_utype (dip->die_ref, NULL);
926 INIT_CPLUS_SPECIFIC (type);
927 switch (dip->die_tag)
930 TYPE_CODE (type) = TYPE_CODE_CLASS;
932 case TAG_structure_type:
933 TYPE_CODE (type) = TYPE_CODE_STRUCT;
936 TYPE_CODE (type) = TYPE_CODE_UNION;
939 /* Should never happen */
940 TYPE_CODE (type) = TYPE_CODE_UNDEF;
941 complaint (&symfile_complaints,
942 "DIE @ 0x%x \"%s\", missing class, structure, or union tag",
946 /* Some compilers try to be helpful by inventing "fake" names for
947 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
948 Thanks, but no thanks... */
949 if (dip->at_name != NULL
950 && *dip->at_name != '~'
951 && *dip->at_name != '.')
953 TYPE_TAG_NAME (type) = obconcat (&objfile->type_obstack,
954 "", "", dip->at_name);
956 /* Use whatever size is known. Zero is a valid size. We might however
957 wish to check has_at_byte_size to make sure that some byte size was
958 given explicitly, but DWARF doesn't specify that explicit sizes of
959 zero have to present, so complaining about missing sizes should
960 probably not be the default. */
961 TYPE_LENGTH (type) = dip->at_byte_size;
962 thisdie += dip->die_length;
963 while (thisdie < enddie)
965 basicdieinfo (&mbr, thisdie, objfile);
966 completedieinfo (&mbr, objfile);
967 if (mbr.die_length <= SIZEOF_DIE_LENGTH)
971 else if (mbr.at_sibling != 0)
973 nextdie = dbbase + mbr.at_sibling - dbroff;
977 nextdie = thisdie + mbr.die_length;
982 /* Get space to record the next field's data. */
983 new = (struct nextfield *) alloca (sizeof (struct nextfield));
988 obsavestring (mbr.at_name, strlen (mbr.at_name),
989 &objfile->type_obstack);
990 FIELD_TYPE (list->field) = decode_die_type (&mbr);
991 FIELD_BITPOS (list->field) = 8 * locval (&mbr);
992 FIELD_STATIC_KIND (list->field) = 0;
993 /* Handle bit fields. */
994 FIELD_BITSIZE (list->field) = mbr.at_bit_size;
997 /* For big endian bits, the at_bit_offset gives the
998 additional bit offset from the MSB of the containing
999 anonymous object to the MSB of the field. We don't
1000 have to do anything special since we don't need to
1001 know the size of the anonymous object. */
1002 FIELD_BITPOS (list->field) += mbr.at_bit_offset;
1006 /* For little endian bits, we need to have a non-zero
1007 at_bit_size, so that we know we are in fact dealing
1008 with a bitfield. Compute the bit offset to the MSB
1009 of the anonymous object, subtract off the number of
1010 bits from the MSB of the field to the MSB of the
1011 object, and then subtract off the number of bits of
1012 the field itself. The result is the bit offset of
1013 the LSB of the field. */
1014 if (mbr.at_bit_size > 0)
1016 if (mbr.has_at_byte_size)
1018 /* The size of the anonymous object containing
1019 the bit field is explicit, so use the
1020 indicated size (in bytes). */
1021 anonymous_size = mbr.at_byte_size;
1025 /* The size of the anonymous object containing
1026 the bit field matches the size of an object
1027 of the bit field's type. DWARF allows
1028 at_byte_size to be left out in such cases, as
1029 a debug information size optimization. */
1030 anonymous_size = TYPE_LENGTH (list->field.type);
1032 FIELD_BITPOS (list->field) +=
1033 anonymous_size * 8 - mbr.at_bit_offset - mbr.at_bit_size;
1039 process_dies (thisdie, nextdie, objfile);
1044 /* Now create the vector of fields, and record how big it is. We may
1045 not even have any fields, if this DIE was generated due to a reference
1046 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1047 set, which clues gdb in to the fact that it needs to search elsewhere
1048 for the full structure definition. */
1051 TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
1055 TYPE_NFIELDS (type) = nfields;
1056 TYPE_FIELDS (type) = (struct field *)
1057 TYPE_ALLOC (type, sizeof (struct field) * nfields);
1058 /* Copy the saved-up fields into the field vector. */
1059 for (n = nfields; list; list = list->next)
1061 TYPE_FIELD (type, --n) = list->field;
1071 read_structure_scope -- process all dies within struct or union
1075 static void read_structure_scope (struct dieinfo *dip,
1076 char *thisdie, char *enddie, struct objfile *objfile)
1080 Called when we find the DIE that starts a structure or union
1081 scope (definition) to process all dies that define the members
1082 of the structure or union. DIP is a pointer to the die info
1083 struct for the DIE that names the structure or union.
1087 Note that we need to call struct_type regardless of whether or not
1088 the DIE has an at_name attribute, since it might be an anonymous
1089 structure or union. This gets the type entered into our set of
1092 However, if the structure is incomplete (an opaque struct/union)
1093 then suppress creating a symbol table entry for it since gdb only
1094 wants to find the one with the complete definition. Note that if
1095 it is complete, we just call new_symbol, which does it's own
1096 checking about whether the struct/union is anonymous or not (and
1097 suppresses creating a symbol table entry itself).
1102 read_structure_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1103 struct objfile *objfile)
1108 type = struct_type (dip, thisdie, enddie, objfile);
1109 if (!TYPE_STUB (type))
1111 sym = new_symbol (dip, objfile);
1114 SYMBOL_TYPE (sym) = type;
1115 if (cu_language == language_cplus)
1117 synthesize_typedef (dip, objfile, type);
1127 decode_array_element_type -- decode type of the array elements
1131 static struct type *decode_array_element_type (char *scan, char *end)
1135 As the last step in decoding the array subscript information for an
1136 array DIE, we need to decode the type of the array elements. We are
1137 passed a pointer to this last part of the subscript information and
1138 must return the appropriate type. If the type attribute is not
1139 recognized, just warn about the problem and return type int.
1142 static struct type *
1143 decode_array_element_type (char *scan)
1147 unsigned short attribute;
1148 unsigned short fundtype;
1151 attribute = target_to_host (scan, SIZEOF_ATTRIBUTE, GET_UNSIGNED,
1153 scan += SIZEOF_ATTRIBUTE;
1154 nbytes = attribute_size (attribute);
1157 bad_array_element_type_complaint (DIE_ID, DIE_NAME, attribute);
1158 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1165 fundtype = target_to_host (scan, nbytes, GET_UNSIGNED,
1167 typep = decode_fund_type (fundtype);
1169 case AT_mod_fund_type:
1170 typep = decode_mod_fund_type (scan);
1172 case AT_user_def_type:
1173 die_ref = target_to_host (scan, nbytes, GET_UNSIGNED,
1175 typep = lookup_utype (die_ref);
1178 typep = alloc_utype (die_ref, NULL);
1181 case AT_mod_u_d_type:
1182 typep = decode_mod_u_d_type (scan);
1185 bad_array_element_type_complaint (DIE_ID, DIE_NAME, attribute);
1186 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1197 decode_subscript_data_item -- decode array subscript item
1201 static struct type *
1202 decode_subscript_data_item (char *scan, char *end)
1206 The array subscripts and the data type of the elements of an
1207 array are described by a list of data items, stored as a block
1208 of contiguous bytes. There is a data item describing each array
1209 dimension, and a final data item describing the element type.
1210 The data items are ordered the same as their appearance in the
1211 source (I.E. leftmost dimension first, next to leftmost second,
1214 The data items describing each array dimension consist of four
1215 parts: (1) a format specifier, (2) type type of the subscript
1216 index, (3) a description of the low bound of the array dimension,
1217 and (4) a description of the high bound of the array dimension.
1219 The last data item is the description of the type of each of
1222 We are passed a pointer to the start of the block of bytes
1223 containing the remaining data items, and a pointer to the first
1224 byte past the data. This function recursively decodes the
1225 remaining data items and returns a type.
1227 If we somehow fail to decode some data, we complain about it
1228 and return a type "array of int".
1231 FIXME: This code only implements the forms currently used
1232 by the AT&T and GNU C compilers.
1234 The end pointer is supplied for error checking, maybe we should
1238 static struct type *
1239 decode_subscript_data_item (char *scan, char *end)
1241 struct type *typep = NULL; /* Array type we are building */
1242 struct type *nexttype; /* Type of each element (may be array) */
1243 struct type *indextype; /* Type of this index */
1244 struct type *rangetype;
1245 unsigned int format;
1246 unsigned short fundtype;
1247 unsigned long lowbound;
1248 unsigned long highbound;
1251 format = target_to_host (scan, SIZEOF_FORMAT_SPECIFIER, GET_UNSIGNED,
1253 scan += SIZEOF_FORMAT_SPECIFIER;
1257 typep = decode_array_element_type (scan);
1260 fundtype = target_to_host (scan, SIZEOF_FMT_FT, GET_UNSIGNED,
1262 indextype = decode_fund_type (fundtype);
1263 scan += SIZEOF_FMT_FT;
1264 nbytes = TARGET_FT_LONG_SIZE (current_objfile);
1265 lowbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile);
1267 highbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile);
1269 nexttype = decode_subscript_data_item (scan, end);
1270 if (nexttype == NULL)
1272 /* Munged subscript data or other problem, fake it. */
1273 complaint (&symfile_complaints,
1274 "DIE @ 0x%x \"%s\", can't decode subscript data items",
1276 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1278 rangetype = create_range_type ((struct type *) NULL, indextype,
1279 lowbound, highbound);
1280 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1289 complaint (&symfile_complaints,
1290 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet",
1291 DIE_ID, DIE_NAME, format);
1292 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1293 rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0);
1294 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1297 complaint (&symfile_complaints,
1298 "DIE @ 0x%x \"%s\", unknown array subscript format %x", DIE_ID,
1300 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1301 rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0);
1302 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1312 dwarf_read_array_type -- read TAG_array_type DIE
1316 static void dwarf_read_array_type (struct dieinfo *dip)
1320 Extract all information from a TAG_array_type DIE and add to
1321 the user defined type vector.
1325 dwarf_read_array_type (struct dieinfo *dip)
1331 unsigned short blocksz;
1334 if (dip->at_ordering != ORD_row_major)
1336 /* FIXME: Can gdb even handle column major arrays? */
1337 complaint (&symfile_complaints,
1338 "DIE @ 0x%x \"%s\", array not row major; not handled correctly",
1341 sub = dip->at_subscr_data;
1344 nbytes = attribute_size (AT_subscr_data);
1345 blocksz = target_to_host (sub, nbytes, GET_UNSIGNED, current_objfile);
1346 subend = sub + nbytes + blocksz;
1348 type = decode_subscript_data_item (sub, subend);
1349 utype = lookup_utype (dip->die_ref);
1352 /* Install user defined type that has not been referenced yet. */
1353 alloc_utype (dip->die_ref, type);
1355 else if (TYPE_CODE (utype) == TYPE_CODE_UNDEF)
1357 /* Ick! A forward ref has already generated a blank type in our
1358 slot, and this type probably already has things pointing to it
1359 (which is what caused it to be created in the first place).
1360 If it's just a place holder we can plop our fully defined type
1361 on top of it. We can't recover the space allocated for our
1362 new type since it might be on an obstack, but we could reuse
1363 it if we kept a list of them, but it might not be worth it
1369 /* Double ick! Not only is a type already in our slot, but
1370 someone has decorated it. Complain and leave it alone. */
1371 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1380 read_tag_pointer_type -- read TAG_pointer_type DIE
1384 static void read_tag_pointer_type (struct dieinfo *dip)
1388 Extract all information from a TAG_pointer_type DIE and add to
1389 the user defined type vector.
1393 read_tag_pointer_type (struct dieinfo *dip)
1398 type = decode_die_type (dip);
1399 utype = lookup_utype (dip->die_ref);
1402 utype = lookup_pointer_type (type);
1403 alloc_utype (dip->die_ref, utype);
1407 TYPE_TARGET_TYPE (utype) = type;
1408 TYPE_POINTER_TYPE (type) = utype;
1410 /* We assume the machine has only one representation for pointers! */
1411 /* FIXME: Possably a poor assumption */
1412 TYPE_LENGTH (utype) = TARGET_PTR_BIT / TARGET_CHAR_BIT;
1413 TYPE_CODE (utype) = TYPE_CODE_PTR;
1421 read_tag_string_type -- read TAG_string_type DIE
1425 static void read_tag_string_type (struct dieinfo *dip)
1429 Extract all information from a TAG_string_type DIE and add to
1430 the user defined type vector. It isn't really a user defined
1431 type, but it behaves like one, with other DIE's using an
1432 AT_user_def_type attribute to reference it.
1436 read_tag_string_type (struct dieinfo *dip)
1439 struct type *indextype;
1440 struct type *rangetype;
1441 unsigned long lowbound = 0;
1442 unsigned long highbound;
1444 if (dip->has_at_byte_size)
1446 /* A fixed bounds string */
1447 highbound = dip->at_byte_size - 1;
1451 /* A varying length string. Stub for now. (FIXME) */
1454 indextype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1455 rangetype = create_range_type ((struct type *) NULL, indextype, lowbound,
1458 utype = lookup_utype (dip->die_ref);
1461 /* No type defined, go ahead and create a blank one to use. */
1462 utype = alloc_utype (dip->die_ref, (struct type *) NULL);
1466 /* Already a type in our slot due to a forward reference. Make sure it
1467 is a blank one. If not, complain and leave it alone. */
1468 if (TYPE_CODE (utype) != TYPE_CODE_UNDEF)
1470 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1475 /* Create the string type using the blank type we either found or created. */
1476 utype = create_string_type (utype, rangetype);
1483 read_subroutine_type -- process TAG_subroutine_type dies
1487 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1492 Handle DIES due to C code like:
1495 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1501 The parameter DIES are currently ignored. See if gdb has a way to
1502 include this info in it's type system, and decode them if so. Is
1503 this what the type structure's "arg_types" field is for? (FIXME)
1507 read_subroutine_type (struct dieinfo *dip, char *thisdie, char *enddie)
1509 struct type *type; /* Type that this function returns */
1510 struct type *ftype; /* Function that returns above type */
1512 /* Decode the type that this subroutine returns */
1514 type = decode_die_type (dip);
1516 /* Check to see if we already have a partially constructed user
1517 defined type for this DIE, from a forward reference. */
1519 ftype = lookup_utype (dip->die_ref);
1522 /* This is the first reference to one of these types. Make
1523 a new one and place it in the user defined types. */
1524 ftype = lookup_function_type (type);
1525 alloc_utype (dip->die_ref, ftype);
1527 else if (TYPE_CODE (ftype) == TYPE_CODE_UNDEF)
1529 /* We have an existing partially constructed type, so bash it
1530 into the correct type. */
1531 TYPE_TARGET_TYPE (ftype) = type;
1532 TYPE_LENGTH (ftype) = 1;
1533 TYPE_CODE (ftype) = TYPE_CODE_FUNC;
1537 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1545 read_enumeration -- process dies which define an enumeration
1549 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1550 char *enddie, struct objfile *objfile)
1554 Given a pointer to a die which begins an enumeration, process all
1555 the dies that define the members of the enumeration.
1559 Note that we need to call enum_type regardless of whether or not we
1560 have a symbol, since we might have an enum without a tag name (thus
1561 no symbol for the tagname).
1565 read_enumeration (struct dieinfo *dip, char *thisdie, char *enddie,
1566 struct objfile *objfile)
1571 type = enum_type (dip, objfile);
1572 sym = new_symbol (dip, objfile);
1575 SYMBOL_TYPE (sym) = type;
1576 if (cu_language == language_cplus)
1578 synthesize_typedef (dip, objfile, type);
1587 enum_type -- decode and return a type for an enumeration
1591 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1595 Given a pointer to a die information structure for the die which
1596 starts an enumeration, process all the dies that define the members
1597 of the enumeration and return a type pointer for the enumeration.
1599 At the same time, for each member of the enumeration, create a
1600 symbol for it with domain VAR_DOMAIN and class LOC_CONST,
1601 and give it the type of the enumeration itself.
1605 Note that the DWARF specification explicitly mandates that enum
1606 constants occur in reverse order from the source program order,
1607 for "consistency" and because this ordering is easier for many
1608 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1609 Entries). Because gdb wants to see the enum members in program
1610 source order, we have to ensure that the order gets reversed while
1611 we are processing them.
1614 static struct type *
1615 enum_type (struct dieinfo *dip, struct objfile *objfile)
1620 struct nextfield *next;
1623 struct nextfield *list = NULL;
1624 struct nextfield *new;
1629 unsigned short blocksz;
1632 int unsigned_enum = 1;
1634 type = lookup_utype (dip->die_ref);
1637 /* No forward references created an empty type, so install one now */
1638 type = alloc_utype (dip->die_ref, NULL);
1640 TYPE_CODE (type) = TYPE_CODE_ENUM;
1641 /* Some compilers try to be helpful by inventing "fake" names for
1642 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1643 Thanks, but no thanks... */
1644 if (dip->at_name != NULL
1645 && *dip->at_name != '~'
1646 && *dip->at_name != '.')
1648 TYPE_TAG_NAME (type) = obconcat (&objfile->type_obstack,
1649 "", "", dip->at_name);
1651 if (dip->at_byte_size != 0)
1653 TYPE_LENGTH (type) = dip->at_byte_size;
1655 scan = dip->at_element_list;
1658 if (dip->short_element_list)
1660 nbytes = attribute_size (AT_short_element_list);
1664 nbytes = attribute_size (AT_element_list);
1666 blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile);
1667 listend = scan + nbytes + blocksz;
1669 while (scan < listend)
1671 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1674 FIELD_TYPE (list->field) = NULL;
1675 FIELD_BITSIZE (list->field) = 0;
1676 FIELD_STATIC_KIND (list->field) = 0;
1677 FIELD_BITPOS (list->field) =
1678 target_to_host (scan, TARGET_FT_LONG_SIZE (objfile), GET_SIGNED,
1680 scan += TARGET_FT_LONG_SIZE (objfile);
1681 list->field.name = obsavestring (scan, strlen (scan),
1682 &objfile->type_obstack);
1683 scan += strlen (scan) + 1;
1685 /* Handcraft a new symbol for this enum member. */
1686 sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack,
1687 sizeof (struct symbol));
1688 memset (sym, 0, sizeof (struct symbol));
1689 DEPRECATED_SYMBOL_NAME (sym) = create_name (list->field.name,
1690 &objfile->symbol_obstack);
1691 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language);
1692 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1693 SYMBOL_CLASS (sym) = LOC_CONST;
1694 SYMBOL_TYPE (sym) = type;
1695 SYMBOL_VALUE (sym) = FIELD_BITPOS (list->field);
1696 if (SYMBOL_VALUE (sym) < 0)
1698 add_symbol_to_list (sym, list_in_scope);
1700 /* Now create the vector of fields, and record how big it is. This is
1701 where we reverse the order, by pulling the members off the list in
1702 reverse order from how they were inserted. If we have no fields
1703 (this is apparently possible in C++) then skip building a field
1708 TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED;
1709 TYPE_NFIELDS (type) = nfields;
1710 TYPE_FIELDS (type) = (struct field *)
1711 obstack_alloc (&objfile->symbol_obstack, sizeof (struct field) * nfields);
1712 /* Copy the saved-up fields into the field vector. */
1713 for (n = 0; (n < nfields) && (list != NULL); list = list->next)
1715 TYPE_FIELD (type, n++) = list->field;
1726 read_func_scope -- process all dies within a function scope
1730 Process all dies within a given function scope. We are passed
1731 a die information structure pointer DIP for the die which
1732 starts the function scope, and pointers into the raw die data
1733 that define the dies within the function scope.
1735 For now, we ignore lexical block scopes within the function.
1736 The problem is that AT&T cc does not define a DWARF lexical
1737 block scope for the function itself, while gcc defines a
1738 lexical block scope for the function. We need to think about
1739 how to handle this difference, or if it is even a problem.
1744 read_func_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1745 struct objfile *objfile)
1747 struct context_stack *new;
1749 /* AT_name is absent if the function is described with an
1750 AT_abstract_origin tag.
1751 Ignore the function description for now to avoid GDB core dumps.
1752 FIXME: Add code to handle AT_abstract_origin tags properly. */
1753 if (dip->at_name == NULL)
1755 complaint (&symfile_complaints, "DIE @ 0x%x, AT_name tag missing",
1760 if (objfile->ei.entry_point >= dip->at_low_pc &&
1761 objfile->ei.entry_point < dip->at_high_pc)
1763 objfile->ei.entry_func_lowpc = dip->at_low_pc;
1764 objfile->ei.entry_func_highpc = dip->at_high_pc;
1766 new = push_context (0, dip->at_low_pc);
1767 new->name = new_symbol (dip, objfile);
1768 list_in_scope = &local_symbols;
1769 process_dies (thisdie + dip->die_length, enddie, objfile);
1770 new = pop_context ();
1771 /* Make a block for the local symbols within. */
1772 finish_block (new->name, &local_symbols, new->old_blocks,
1773 new->start_addr, dip->at_high_pc, objfile);
1774 list_in_scope = &file_symbols;
1782 handle_producer -- process the AT_producer attribute
1786 Perform any operations that depend on finding a particular
1787 AT_producer attribute.
1792 handle_producer (char *producer)
1795 /* If this compilation unit was compiled with g++ or gcc, then set the
1796 processing_gcc_compilation flag. */
1798 if (STREQN (producer, GCC_PRODUCER, strlen (GCC_PRODUCER)))
1800 char version = producer[strlen (GCC_PRODUCER)];
1801 processing_gcc_compilation = (version == '2' ? 2 : 1);
1805 processing_gcc_compilation =
1806 STREQN (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER));
1809 /* Select a demangling style if we can identify the producer and if
1810 the current style is auto. We leave the current style alone if it
1811 is not auto. We also leave the demangling style alone if we find a
1812 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1814 if (AUTO_DEMANGLING)
1816 if (STREQN (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER)))
1819 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't
1820 know whether it will use the old style or v3 mangling. */
1821 set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
1824 else if (STREQN (producer, LCC_PRODUCER, strlen (LCC_PRODUCER)))
1826 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING);
1836 read_file_scope -- process all dies within a file scope
1840 Process all dies within a given file scope. We are passed a
1841 pointer to the die information structure for the die which
1842 starts the file scope, and pointers into the raw die data which
1843 mark the range of dies within the file scope.
1845 When the partial symbol table is built, the file offset for the line
1846 number table for each compilation unit is saved in the partial symbol
1847 table entry for that compilation unit. As the symbols for each
1848 compilation unit are read, the line number table is read into memory
1849 and the variable lnbase is set to point to it. Thus all we have to
1850 do is use lnbase to access the line number table for the current
1855 read_file_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1856 struct objfile *objfile)
1858 struct cleanup *back_to;
1859 struct symtab *symtab;
1861 if (objfile->ei.entry_point >= dip->at_low_pc &&
1862 objfile->ei.entry_point < dip->at_high_pc)
1864 objfile->ei.entry_file_lowpc = dip->at_low_pc;
1865 objfile->ei.entry_file_highpc = dip->at_high_pc;
1867 set_cu_language (dip);
1868 if (dip->at_producer != NULL)
1870 handle_producer (dip->at_producer);
1872 numutypes = (enddie - thisdie) / 4;
1873 utypes = (struct type **) xmalloc (numutypes * sizeof (struct type *));
1874 back_to = make_cleanup (free_utypes, NULL);
1875 memset (utypes, 0, numutypes * sizeof (struct type *));
1876 memset (ftypes, 0, FT_NUM_MEMBERS * sizeof (struct type *));
1877 start_symtab (dip->at_name, dip->at_comp_dir, dip->at_low_pc);
1878 record_debugformat ("DWARF 1");
1879 decode_line_numbers (lnbase);
1880 process_dies (thisdie + dip->die_length, enddie, objfile);
1882 symtab = end_symtab (dip->at_high_pc, objfile, 0);
1885 symtab->language = cu_language;
1887 do_cleanups (back_to);
1894 process_dies -- process a range of DWARF Information Entries
1898 static void process_dies (char *thisdie, char *enddie,
1899 struct objfile *objfile)
1903 Process all DIE's in a specified range. May be (and almost
1904 certainly will be) called recursively.
1908 process_dies (char *thisdie, char *enddie, struct objfile *objfile)
1913 while (thisdie < enddie)
1915 basicdieinfo (&di, thisdie, objfile);
1916 if (di.die_length < SIZEOF_DIE_LENGTH)
1920 else if (di.die_tag == TAG_padding)
1922 nextdie = thisdie + di.die_length;
1926 completedieinfo (&di, objfile);
1927 if (di.at_sibling != 0)
1929 nextdie = dbbase + di.at_sibling - dbroff;
1933 nextdie = thisdie + di.die_length;
1935 /* I think that these are always text, not data, addresses. */
1936 di.at_low_pc = SMASH_TEXT_ADDRESS (di.at_low_pc);
1937 di.at_high_pc = SMASH_TEXT_ADDRESS (di.at_high_pc);
1940 case TAG_compile_unit:
1941 /* Skip Tag_compile_unit if we are already inside a compilation
1942 unit, we are unable to handle nested compilation units
1943 properly (FIXME). */
1944 if (current_subfile == NULL)
1945 read_file_scope (&di, thisdie, nextdie, objfile);
1947 nextdie = thisdie + di.die_length;
1949 case TAG_global_subroutine:
1950 case TAG_subroutine:
1951 if (di.has_at_low_pc)
1953 read_func_scope (&di, thisdie, nextdie, objfile);
1956 case TAG_lexical_block:
1957 read_lexical_block_scope (&di, thisdie, nextdie, objfile);
1959 case TAG_class_type:
1960 case TAG_structure_type:
1961 case TAG_union_type:
1962 read_structure_scope (&di, thisdie, nextdie, objfile);
1964 case TAG_enumeration_type:
1965 read_enumeration (&di, thisdie, nextdie, objfile);
1967 case TAG_subroutine_type:
1968 read_subroutine_type (&di, thisdie, nextdie);
1970 case TAG_array_type:
1971 dwarf_read_array_type (&di);
1973 case TAG_pointer_type:
1974 read_tag_pointer_type (&di);
1976 case TAG_string_type:
1977 read_tag_string_type (&di);
1980 new_symbol (&di, objfile);
1992 decode_line_numbers -- decode a line number table fragment
1996 static void decode_line_numbers (char *tblscan, char *tblend,
1997 long length, long base, long line, long pc)
2001 Translate the DWARF line number information to gdb form.
2003 The ".line" section contains one or more line number tables, one for
2004 each ".line" section from the objects that were linked.
2006 The AT_stmt_list attribute for each TAG_source_file entry in the
2007 ".debug" section contains the offset into the ".line" section for the
2008 start of the table for that file.
2010 The table itself has the following structure:
2012 <table length><base address><source statement entry>
2013 4 bytes 4 bytes 10 bytes
2015 The table length is the total size of the table, including the 4 bytes
2016 for the length information.
2018 The base address is the address of the first instruction generated
2019 for the source file.
2021 Each source statement entry has the following structure:
2023 <line number><statement position><address delta>
2024 4 bytes 2 bytes 4 bytes
2026 The line number is relative to the start of the file, starting with
2029 The statement position either -1 (0xFFFF) or the number of characters
2030 from the beginning of the line to the beginning of the statement.
2032 The address delta is the difference between the base address and
2033 the address of the first instruction for the statement.
2035 Note that we must copy the bytes from the packed table to our local
2036 variables before attempting to use them, to avoid alignment problems
2037 on some machines, particularly RISC processors.
2041 Does gdb expect the line numbers to be sorted? They are now by
2042 chance/luck, but are not required to be. (FIXME)
2044 The line with number 0 is unused, gdb apparently can discover the
2045 span of the last line some other way. How? (FIXME)
2049 decode_line_numbers (char *linetable)
2053 unsigned long length;
2058 if (linetable != NULL)
2060 tblscan = tblend = linetable;
2061 length = target_to_host (tblscan, SIZEOF_LINETBL_LENGTH, GET_UNSIGNED,
2063 tblscan += SIZEOF_LINETBL_LENGTH;
2065 base = target_to_host (tblscan, TARGET_FT_POINTER_SIZE (objfile),
2066 GET_UNSIGNED, current_objfile);
2067 tblscan += TARGET_FT_POINTER_SIZE (objfile);
2069 while (tblscan < tblend)
2071 line = target_to_host (tblscan, SIZEOF_LINETBL_LINENO, GET_UNSIGNED,
2073 tblscan += SIZEOF_LINETBL_LINENO + SIZEOF_LINETBL_STMT;
2074 pc = target_to_host (tblscan, SIZEOF_LINETBL_DELTA, GET_UNSIGNED,
2076 tblscan += SIZEOF_LINETBL_DELTA;
2080 record_line (current_subfile, line, pc);
2090 locval -- compute the value of a location attribute
2094 static int locval (struct dieinfo *dip)
2098 Given pointer to a string of bytes that define a location, compute
2099 the location and return the value.
2100 A location description containing no atoms indicates that the
2101 object is optimized out. The optimized_out flag is set for those,
2102 the return value is meaningless.
2104 When computing values involving the current value of the frame pointer,
2105 the value zero is used, which results in a value relative to the frame
2106 pointer, rather than the absolute value. This is what GDB wants
2109 When the result is a register number, the isreg flag is set, otherwise
2110 it is cleared. This is a kludge until we figure out a better
2111 way to handle the problem. Gdb's design does not mesh well with the
2112 DWARF notion of a location computing interpreter, which is a shame
2113 because the flexibility goes unused.
2117 Note that stack[0] is unused except as a default error return.
2118 Note that stack overflow is not yet handled.
2122 locval (struct dieinfo *dip)
2124 unsigned short nbytes;
2125 unsigned short locsize;
2126 auto long stack[64];
2133 loc = dip->at_location;
2134 nbytes = attribute_size (AT_location);
2135 locsize = target_to_host (loc, nbytes, GET_UNSIGNED, current_objfile);
2137 end = loc + locsize;
2142 dip->optimized_out = 1;
2143 loc_value_size = TARGET_FT_LONG_SIZE (current_objfile);
2146 dip->optimized_out = 0;
2147 loc_atom_code = target_to_host (loc, SIZEOF_LOC_ATOM_CODE, GET_UNSIGNED,
2149 loc += SIZEOF_LOC_ATOM_CODE;
2150 switch (loc_atom_code)
2157 /* push register (number) */
2159 = DWARF_REG_TO_REGNUM (target_to_host (loc, loc_value_size,
2162 loc += loc_value_size;
2166 /* push value of register (number) */
2167 /* Actually, we compute the value as if register has 0, so the
2168 value ends up being the offset from that register. */
2170 dip->basereg = target_to_host (loc, loc_value_size, GET_UNSIGNED,
2172 loc += loc_value_size;
2173 stack[++stacki] = 0;
2176 /* push address (relocated address) */
2177 stack[++stacki] = target_to_host (loc, loc_value_size,
2178 GET_UNSIGNED, current_objfile);
2179 loc += loc_value_size;
2182 /* push constant (number) FIXME: signed or unsigned! */
2183 stack[++stacki] = target_to_host (loc, loc_value_size,
2184 GET_SIGNED, current_objfile);
2185 loc += loc_value_size;
2188 /* pop, deref and push 2 bytes (as a long) */
2189 complaint (&symfile_complaints,
2190 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%lx not handled",
2191 DIE_ID, DIE_NAME, stack[stacki]);
2193 case OP_DEREF4: /* pop, deref and push 4 bytes (as a long) */
2194 complaint (&symfile_complaints,
2195 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%lx not handled",
2196 DIE_ID, DIE_NAME, stack[stacki]);
2198 case OP_ADD: /* pop top 2 items, add, push result */
2199 stack[stacki - 1] += stack[stacki];
2204 return (stack[stacki]);
2211 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2215 static void read_ofile_symtab (struct partial_symtab *pst)
2219 When expanding a partial symbol table entry to a full symbol table
2220 entry, this is the function that gets called to read in the symbols
2221 for the compilation unit. A pointer to the newly constructed symtab,
2222 which is now the new first one on the objfile's symtab list, is
2223 stashed in the partial symbol table entry.
2227 read_ofile_symtab (struct partial_symtab *pst)
2229 struct cleanup *back_to;
2230 unsigned long lnsize;
2233 char lnsizedata[SIZEOF_LINETBL_LENGTH];
2235 abfd = pst->objfile->obfd;
2236 current_objfile = pst->objfile;
2238 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2239 unit, seek to the location in the file, and read in all the DIE's. */
2242 dbsize = DBLENGTH (pst);
2243 dbbase = xmalloc (dbsize);
2244 dbroff = DBROFF (pst);
2245 foffset = DBFOFF (pst) + dbroff;
2246 base_section_offsets = pst->section_offsets;
2247 baseaddr = ANOFFSET (pst->section_offsets, 0);
2248 if (bfd_seek (abfd, foffset, SEEK_SET) ||
2249 (bfd_bread (dbbase, dbsize, abfd) != dbsize))
2252 error ("can't read DWARF data");
2254 back_to = make_cleanup (xfree, dbbase);
2256 /* If there is a line number table associated with this compilation unit
2257 then read the size of this fragment in bytes, from the fragment itself.
2258 Allocate a buffer for the fragment and read it in for future
2264 if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) ||
2265 (bfd_bread (lnsizedata, sizeof (lnsizedata), abfd)
2266 != sizeof (lnsizedata)))
2268 error ("can't read DWARF line number table size");
2270 lnsize = target_to_host (lnsizedata, SIZEOF_LINETBL_LENGTH,
2271 GET_UNSIGNED, pst->objfile);
2272 lnbase = xmalloc (lnsize);
2273 if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) ||
2274 (bfd_bread (lnbase, lnsize, abfd) != lnsize))
2277 error ("can't read DWARF line numbers");
2279 make_cleanup (xfree, lnbase);
2282 process_dies (dbbase, dbbase + dbsize, pst->objfile);
2283 do_cleanups (back_to);
2284 current_objfile = NULL;
2285 pst->symtab = pst->objfile->symtabs;
2292 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2296 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2300 Called once for each partial symbol table entry that needs to be
2301 expanded into a full symbol table entry.
2306 psymtab_to_symtab_1 (struct partial_symtab *pst)
2309 struct cleanup *old_chain;
2315 warning ("psymtab for %s already read in. Shouldn't happen.",
2320 /* Read in all partial symtabs on which this one is dependent */
2321 for (i = 0; i < pst->number_of_dependencies; i++)
2323 if (!pst->dependencies[i]->readin)
2325 /* Inform about additional files that need to be read in. */
2328 fputs_filtered (" ", gdb_stdout);
2330 fputs_filtered ("and ", gdb_stdout);
2332 printf_filtered ("%s...",
2333 pst->dependencies[i]->filename);
2335 gdb_flush (gdb_stdout); /* Flush output */
2337 psymtab_to_symtab_1 (pst->dependencies[i]);
2340 if (DBLENGTH (pst)) /* Otherwise it's a dummy */
2343 old_chain = make_cleanup (really_free_pendings, 0);
2344 read_ofile_symtab (pst);
2347 printf_filtered ("%d DIE's, sorting...", diecount);
2349 gdb_flush (gdb_stdout);
2351 sort_symtab_syms (pst->symtab);
2352 do_cleanups (old_chain);
2363 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2367 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2371 This is the DWARF support entry point for building a full symbol
2372 table entry from a partial symbol table entry. We are passed a
2373 pointer to the partial symbol table entry that needs to be expanded.
2378 dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2385 warning ("psymtab for %s already read in. Shouldn't happen.",
2390 if (DBLENGTH (pst) || pst->number_of_dependencies)
2392 /* Print the message now, before starting serious work, to avoid
2393 disconcerting pauses. */
2396 printf_filtered ("Reading in symbols for %s...",
2398 gdb_flush (gdb_stdout);
2401 psymtab_to_symtab_1 (pst);
2403 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2404 we need to do an equivalent or is this something peculiar to
2406 Match with global symbols. This only needs to be done once,
2407 after all of the symtabs and dependencies have been read in.
2409 scan_file_globals (pst->objfile);
2412 /* Finish up the verbose info message. */
2415 printf_filtered ("done.\n");
2416 gdb_flush (gdb_stdout);
2427 add_enum_psymbol -- add enumeration members to partial symbol table
2431 Given pointer to a DIE that is known to be for an enumeration,
2432 extract the symbolic names of the enumeration members and add
2433 partial symbols for them.
2437 add_enum_psymbol (struct dieinfo *dip, struct objfile *objfile)
2441 unsigned short blocksz;
2444 scan = dip->at_element_list;
2447 if (dip->short_element_list)
2449 nbytes = attribute_size (AT_short_element_list);
2453 nbytes = attribute_size (AT_element_list);
2455 blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile);
2457 listend = scan + blocksz;
2458 while (scan < listend)
2460 scan += TARGET_FT_LONG_SIZE (objfile);
2461 add_psymbol_to_list (scan, strlen (scan), VAR_DOMAIN, LOC_CONST,
2462 &objfile->static_psymbols, 0, 0, cu_language,
2464 scan += strlen (scan) + 1;
2473 add_partial_symbol -- add symbol to partial symbol table
2477 Given a DIE, if it is one of the types that we want to
2478 add to a partial symbol table, finish filling in the die info
2479 and then add a partial symbol table entry for it.
2483 The caller must ensure that the DIE has a valid name attribute.
2487 add_partial_symbol (struct dieinfo *dip, struct objfile *objfile)
2489 switch (dip->die_tag)
2491 case TAG_global_subroutine:
2492 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2493 VAR_DOMAIN, LOC_BLOCK,
2494 &objfile->global_psymbols,
2495 0, dip->at_low_pc, cu_language, objfile);
2497 case TAG_global_variable:
2498 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2499 VAR_DOMAIN, LOC_STATIC,
2500 &objfile->global_psymbols,
2501 0, 0, cu_language, objfile);
2503 case TAG_subroutine:
2504 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2505 VAR_DOMAIN, LOC_BLOCK,
2506 &objfile->static_psymbols,
2507 0, dip->at_low_pc, cu_language, objfile);
2509 case TAG_local_variable:
2510 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2511 VAR_DOMAIN, LOC_STATIC,
2512 &objfile->static_psymbols,
2513 0, 0, cu_language, objfile);
2516 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2517 VAR_DOMAIN, LOC_TYPEDEF,
2518 &objfile->static_psymbols,
2519 0, 0, cu_language, objfile);
2521 case TAG_class_type:
2522 case TAG_structure_type:
2523 case TAG_union_type:
2524 case TAG_enumeration_type:
2525 /* Do not add opaque aggregate definitions to the psymtab. */
2526 if (!dip->has_at_byte_size)
2528 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2529 STRUCT_DOMAIN, LOC_TYPEDEF,
2530 &objfile->static_psymbols,
2531 0, 0, cu_language, objfile);
2532 if (cu_language == language_cplus)
2534 /* For C++, these implicitly act as typedefs as well. */
2535 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2536 VAR_DOMAIN, LOC_TYPEDEF,
2537 &objfile->static_psymbols,
2538 0, 0, cu_language, objfile);
2548 scan_partial_symbols -- scan DIE's within a single compilation unit
2552 Process the DIE's within a single compilation unit, looking for
2553 interesting DIE's that contribute to the partial symbol table entry
2554 for this compilation unit.
2558 There are some DIE's that may appear both at file scope and within
2559 the scope of a function. We are only interested in the ones at file
2560 scope, and the only way to tell them apart is to keep track of the
2561 scope. For example, consider the test case:
2566 for which the relevant DWARF segment has the structure:
2569 0x23 global subrtn sibling 0x9b
2571 fund_type FT_integer
2576 0x23 local var sibling 0x97
2578 fund_type FT_integer
2579 location OP_BASEREG 0xe
2586 0x1d local var sibling 0xb8
2588 fund_type FT_integer
2589 location OP_ADDR 0x800025dc
2594 We want to include the symbol 'i' in the partial symbol table, but
2595 not the symbol 'j'. In essence, we want to skip all the dies within
2596 the scope of a TAG_global_subroutine DIE.
2598 Don't attempt to add anonymous structures or unions since they have
2599 no name. Anonymous enumerations however are processed, because we
2600 want to extract their member names (the check for a tag name is
2603 Also, for variables and subroutines, check that this is the place
2604 where the actual definition occurs, rather than just a reference
2612 scan_partial_symbols (char *thisdie, char *enddie, struct objfile *objfile)
2618 while (thisdie < enddie)
2620 basicdieinfo (&di, thisdie, objfile);
2621 if (di.die_length < SIZEOF_DIE_LENGTH)
2627 nextdie = thisdie + di.die_length;
2628 /* To avoid getting complete die information for every die, we
2629 only do it (below) for the cases we are interested in. */
2632 case TAG_global_subroutine:
2633 case TAG_subroutine:
2634 completedieinfo (&di, objfile);
2635 if (di.at_name && (di.has_at_low_pc || di.at_location))
2637 add_partial_symbol (&di, objfile);
2638 /* If there is a sibling attribute, adjust the nextdie
2639 pointer to skip the entire scope of the subroutine.
2640 Apply some sanity checking to make sure we don't
2641 overrun or underrun the range of remaining DIE's */
2642 if (di.at_sibling != 0)
2644 temp = dbbase + di.at_sibling - dbroff;
2645 if ((temp < thisdie) || (temp >= enddie))
2647 bad_die_ref_complaint (DIE_ID, DIE_NAME,
2657 case TAG_global_variable:
2658 case TAG_local_variable:
2659 completedieinfo (&di, objfile);
2660 if (di.at_name && (di.has_at_low_pc || di.at_location))
2662 add_partial_symbol (&di, objfile);
2666 case TAG_class_type:
2667 case TAG_structure_type:
2668 case TAG_union_type:
2669 completedieinfo (&di, objfile);
2672 add_partial_symbol (&di, objfile);
2675 case TAG_enumeration_type:
2676 completedieinfo (&di, objfile);
2679 add_partial_symbol (&di, objfile);
2681 add_enum_psymbol (&di, objfile);
2693 scan_compilation_units -- build a psymtab entry for each compilation
2697 This is the top level dwarf parsing routine for building partial
2700 It scans from the beginning of the DWARF table looking for the first
2701 TAG_compile_unit DIE, and then follows the sibling chain to locate
2702 each additional TAG_compile_unit DIE.
2704 For each TAG_compile_unit DIE it creates a partial symtab structure,
2705 calls a subordinate routine to collect all the compilation unit's
2706 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2707 new partial symtab structure into the partial symbol table. It also
2708 records the appropriate information in the partial symbol table entry
2709 to allow the chunk of DIE's and line number table for this compilation
2710 unit to be located and re-read later, to generate a complete symbol
2711 table entry for the compilation unit.
2713 Thus it effectively partitions up a chunk of DIE's for multiple
2714 compilation units into smaller DIE chunks and line number tables,
2715 and associates them with a partial symbol table entry.
2719 If any compilation unit has no line number table associated with
2720 it for some reason (a missing at_stmt_list attribute, rather than
2721 just one with a value of zero, which is valid) then we ensure that
2722 the recorded file offset is zero so that the routine which later
2723 reads line number table fragments knows that there is no fragment
2733 scan_compilation_units (char *thisdie, char *enddie, file_ptr dbfoff,
2734 file_ptr lnoffset, struct objfile *objfile)
2738 struct partial_symtab *pst;
2741 file_ptr curlnoffset;
2743 while (thisdie < enddie)
2745 basicdieinfo (&di, thisdie, objfile);
2746 if (di.die_length < SIZEOF_DIE_LENGTH)
2750 else if (di.die_tag != TAG_compile_unit)
2752 nextdie = thisdie + di.die_length;
2756 completedieinfo (&di, objfile);
2757 set_cu_language (&di);
2758 if (di.at_sibling != 0)
2760 nextdie = dbbase + di.at_sibling - dbroff;
2764 nextdie = thisdie + di.die_length;
2766 curoff = thisdie - dbbase;
2767 culength = nextdie - thisdie;
2768 curlnoffset = di.has_at_stmt_list ? lnoffset + di.at_stmt_list : 0;
2770 /* First allocate a new partial symbol table structure */
2772 pst = start_psymtab_common (objfile, base_section_offsets,
2773 di.at_name, di.at_low_pc,
2774 objfile->global_psymbols.next,
2775 objfile->static_psymbols.next);
2777 pst->texthigh = di.at_high_pc;
2778 pst->read_symtab_private = (char *)
2779 obstack_alloc (&objfile->psymbol_obstack,
2780 sizeof (struct dwfinfo));
2781 DBFOFF (pst) = dbfoff;
2782 DBROFF (pst) = curoff;
2783 DBLENGTH (pst) = culength;
2784 LNFOFF (pst) = curlnoffset;
2785 pst->read_symtab = dwarf_psymtab_to_symtab;
2787 /* Now look for partial symbols */
2789 scan_partial_symbols (thisdie + di.die_length, nextdie, objfile);
2791 pst->n_global_syms = objfile->global_psymbols.next -
2792 (objfile->global_psymbols.list + pst->globals_offset);
2793 pst->n_static_syms = objfile->static_psymbols.next -
2794 (objfile->static_psymbols.list + pst->statics_offset);
2795 sort_pst_symbols (pst);
2796 /* If there is already a psymtab or symtab for a file of this name,
2797 remove it. (If there is a symtab, more drastic things also
2798 happen.) This happens in VxWorks. */
2799 free_named_symtabs (pst->filename);
2809 new_symbol -- make a symbol table entry for a new symbol
2813 static struct symbol *new_symbol (struct dieinfo *dip,
2814 struct objfile *objfile)
2818 Given a pointer to a DWARF information entry, figure out if we need
2819 to make a symbol table entry for it, and if so, create a new entry
2820 and return a pointer to it.
2823 static struct symbol *
2824 new_symbol (struct dieinfo *dip, struct objfile *objfile)
2826 struct symbol *sym = NULL;
2828 if (dip->at_name != NULL)
2830 sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack,
2831 sizeof (struct symbol));
2832 OBJSTAT (objfile, n_syms++);
2833 memset (sym, 0, sizeof (struct symbol));
2834 /* default assumptions */
2835 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2836 SYMBOL_CLASS (sym) = LOC_STATIC;
2837 SYMBOL_TYPE (sym) = decode_die_type (dip);
2839 /* If this symbol is from a C++ compilation, then attempt to cache the
2840 demangled form for future reference. This is a typical time versus
2841 space tradeoff, that was decided in favor of time because it sped up
2842 C++ symbol lookups by a factor of about 20. */
2844 SYMBOL_LANGUAGE (sym) = cu_language;
2845 SYMBOL_SET_NAMES (sym, dip->at_name, strlen (dip->at_name), objfile);
2846 switch (dip->die_tag)
2849 SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc;
2850 SYMBOL_CLASS (sym) = LOC_LABEL;
2852 case TAG_global_subroutine:
2853 case TAG_subroutine:
2854 SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc;
2855 SYMBOL_TYPE (sym) = lookup_function_type (SYMBOL_TYPE (sym));
2856 if (dip->at_prototyped)
2857 TYPE_FLAGS (SYMBOL_TYPE (sym)) |= TYPE_FLAG_PROTOTYPED;
2858 SYMBOL_CLASS (sym) = LOC_BLOCK;
2859 if (dip->die_tag == TAG_global_subroutine)
2861 add_symbol_to_list (sym, &global_symbols);
2865 add_symbol_to_list (sym, list_in_scope);
2868 case TAG_global_variable:
2869 if (dip->at_location != NULL)
2871 SYMBOL_VALUE_ADDRESS (sym) = locval (dip);
2872 add_symbol_to_list (sym, &global_symbols);
2873 SYMBOL_CLASS (sym) = LOC_STATIC;
2874 SYMBOL_VALUE (sym) += baseaddr;
2877 case TAG_local_variable:
2878 if (dip->at_location != NULL)
2880 int loc = locval (dip);
2881 if (dip->optimized_out)
2883 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT;
2885 else if (dip->isreg)
2887 SYMBOL_CLASS (sym) = LOC_REGISTER;
2889 else if (dip->offreg)
2891 SYMBOL_CLASS (sym) = LOC_BASEREG;
2892 SYMBOL_BASEREG (sym) = dip->basereg;
2896 SYMBOL_CLASS (sym) = LOC_STATIC;
2897 SYMBOL_VALUE (sym) += baseaddr;
2899 if (SYMBOL_CLASS (sym) == LOC_STATIC)
2901 /* LOC_STATIC address class MUST use SYMBOL_VALUE_ADDRESS,
2902 which may store to a bigger location than SYMBOL_VALUE. */
2903 SYMBOL_VALUE_ADDRESS (sym) = loc;
2907 SYMBOL_VALUE (sym) = loc;
2909 add_symbol_to_list (sym, list_in_scope);
2912 case TAG_formal_parameter:
2913 if (dip->at_location != NULL)
2915 SYMBOL_VALUE (sym) = locval (dip);
2917 add_symbol_to_list (sym, list_in_scope);
2920 SYMBOL_CLASS (sym) = LOC_REGPARM;
2922 else if (dip->offreg)
2924 SYMBOL_CLASS (sym) = LOC_BASEREG_ARG;
2925 SYMBOL_BASEREG (sym) = dip->basereg;
2929 SYMBOL_CLASS (sym) = LOC_ARG;
2932 case TAG_unspecified_parameters:
2933 /* From varargs functions; gdb doesn't seem to have any interest in
2934 this information, so just ignore it for now. (FIXME?) */
2936 case TAG_class_type:
2937 case TAG_structure_type:
2938 case TAG_union_type:
2939 case TAG_enumeration_type:
2940 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
2941 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
2942 add_symbol_to_list (sym, list_in_scope);
2945 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
2946 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2947 add_symbol_to_list (sym, list_in_scope);
2950 /* Not a tag we recognize. Hopefully we aren't processing trash
2951 data, but since we must specifically ignore things we don't
2952 recognize, there is nothing else we should do at this point. */
2963 synthesize_typedef -- make a symbol table entry for a "fake" typedef
2967 static void synthesize_typedef (struct dieinfo *dip,
2968 struct objfile *objfile,
2973 Given a pointer to a DWARF information entry, synthesize a typedef
2974 for the name in the DIE, using the specified type.
2976 This is used for C++ class, structs, unions, and enumerations to
2977 set up the tag name as a type.
2982 synthesize_typedef (struct dieinfo *dip, struct objfile *objfile,
2985 struct symbol *sym = NULL;
2987 if (dip->at_name != NULL)
2989 sym = (struct symbol *)
2990 obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol));
2991 OBJSTAT (objfile, n_syms++);
2992 memset (sym, 0, sizeof (struct symbol));
2993 DEPRECATED_SYMBOL_NAME (sym) = create_name (dip->at_name,
2994 &objfile->symbol_obstack);
2995 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language);
2996 SYMBOL_TYPE (sym) = type;
2997 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
2998 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2999 add_symbol_to_list (sym, list_in_scope);
3007 decode_mod_fund_type -- decode a modified fundamental type
3011 static struct type *decode_mod_fund_type (char *typedata)
3015 Decode a block of data containing a modified fundamental
3016 type specification. TYPEDATA is a pointer to the block,
3017 which starts with a length containing the size of the rest
3018 of the block. At the end of the block is a fundmental type
3019 code value that gives the fundamental type. Everything
3020 in between are type modifiers.
3022 We simply compute the number of modifiers and call the general
3023 function decode_modified_type to do the actual work.
3026 static struct type *
3027 decode_mod_fund_type (char *typedata)
3029 struct type *typep = NULL;
3030 unsigned short modcount;
3033 /* Get the total size of the block, exclusive of the size itself */
3035 nbytes = attribute_size (AT_mod_fund_type);
3036 modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile);
3039 /* Deduct the size of the fundamental type bytes at the end of the block. */
3041 modcount -= attribute_size (AT_fund_type);
3043 /* Now do the actual decoding */
3045 typep = decode_modified_type (typedata, modcount, AT_mod_fund_type);
3053 decode_mod_u_d_type -- decode a modified user defined type
3057 static struct type *decode_mod_u_d_type (char *typedata)
3061 Decode a block of data containing a modified user defined
3062 type specification. TYPEDATA is a pointer to the block,
3063 which consists of a two byte length, containing the size
3064 of the rest of the block. At the end of the block is a
3065 four byte value that gives a reference to a user defined type.
3066 Everything in between are type modifiers.
3068 We simply compute the number of modifiers and call the general
3069 function decode_modified_type to do the actual work.
3072 static struct type *
3073 decode_mod_u_d_type (char *typedata)
3075 struct type *typep = NULL;
3076 unsigned short modcount;
3079 /* Get the total size of the block, exclusive of the size itself */
3081 nbytes = attribute_size (AT_mod_u_d_type);
3082 modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile);
3085 /* Deduct the size of the reference type bytes at the end of the block. */
3087 modcount -= attribute_size (AT_user_def_type);
3089 /* Now do the actual decoding */
3091 typep = decode_modified_type (typedata, modcount, AT_mod_u_d_type);
3099 decode_modified_type -- decode modified user or fundamental type
3103 static struct type *decode_modified_type (char *modifiers,
3104 unsigned short modcount, int mtype)
3108 Decode a modified type, either a modified fundamental type or
3109 a modified user defined type. MODIFIERS is a pointer to the
3110 block of bytes that define MODCOUNT modifiers. Immediately
3111 following the last modifier is a short containing the fundamental
3112 type or a long containing the reference to the user defined
3113 type. Which one is determined by MTYPE, which is either
3114 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3115 type we are generating.
3117 We call ourself recursively to generate each modified type,`
3118 until MODCOUNT reaches zero, at which point we have consumed
3119 all the modifiers and generate either the fundamental type or
3120 user defined type. When the recursion unwinds, each modifier
3121 is applied in turn to generate the full modified type.
3125 If we find a modifier that we don't recognize, and it is not one
3126 of those reserved for application specific use, then we issue a
3127 warning and simply ignore the modifier.
3131 We currently ignore MOD_const and MOD_volatile. (FIXME)
3135 static struct type *
3136 decode_modified_type (char *modifiers, unsigned int modcount, int mtype)
3138 struct type *typep = NULL;
3139 unsigned short fundtype;
3148 case AT_mod_fund_type:
3149 nbytes = attribute_size (AT_fund_type);
3150 fundtype = target_to_host (modifiers, nbytes, GET_UNSIGNED,
3152 typep = decode_fund_type (fundtype);
3154 case AT_mod_u_d_type:
3155 nbytes = attribute_size (AT_user_def_type);
3156 die_ref = target_to_host (modifiers, nbytes, GET_UNSIGNED,
3158 typep = lookup_utype (die_ref);
3161 typep = alloc_utype (die_ref, NULL);
3165 complaint (&symfile_complaints,
3166 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)",
3167 DIE_ID, DIE_NAME, mtype);
3168 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3174 modifier = *modifiers++;
3175 typep = decode_modified_type (modifiers, --modcount, mtype);
3178 case MOD_pointer_to:
3179 typep = lookup_pointer_type (typep);
3181 case MOD_reference_to:
3182 typep = lookup_reference_type (typep);
3185 complaint (&symfile_complaints,
3186 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", DIE_ID,
3187 DIE_NAME); /* FIXME */
3190 complaint (&symfile_complaints,
3191 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored",
3192 DIE_ID, DIE_NAME); /* FIXME */
3195 if (!(MOD_lo_user <= (unsigned char) modifier
3196 && (unsigned char) modifier <= MOD_hi_user))
3198 complaint (&symfile_complaints,
3199 "DIE @ 0x%x \"%s\", unknown type modifier %u", DIE_ID,
3200 DIE_NAME, modifier);
3212 decode_fund_type -- translate basic DWARF type to gdb base type
3216 Given an integer that is one of the fundamental DWARF types,
3217 translate it to one of the basic internal gdb types and return
3218 a pointer to the appropriate gdb type (a "struct type *").
3222 For robustness, if we are asked to translate a fundamental
3223 type that we are unprepared to deal with, we return int so
3224 callers can always depend upon a valid type being returned,
3225 and so gdb may at least do something reasonable by default.
3226 If the type is not in the range of those types defined as
3227 application specific types, we also issue a warning.
3230 static struct type *
3231 decode_fund_type (unsigned int fundtype)
3233 struct type *typep = NULL;
3239 typep = dwarf_fundamental_type (current_objfile, FT_VOID);
3242 case FT_boolean: /* Was FT_set in AT&T version */
3243 typep = dwarf_fundamental_type (current_objfile, FT_BOOLEAN);
3246 case FT_pointer: /* (void *) */
3247 typep = dwarf_fundamental_type (current_objfile, FT_VOID);
3248 typep = lookup_pointer_type (typep);
3252 typep = dwarf_fundamental_type (current_objfile, FT_CHAR);
3255 case FT_signed_char:
3256 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_CHAR);
3259 case FT_unsigned_char:
3260 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_CHAR);
3264 typep = dwarf_fundamental_type (current_objfile, FT_SHORT);
3267 case FT_signed_short:
3268 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_SHORT);
3271 case FT_unsigned_short:
3272 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_SHORT);
3276 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3279 case FT_signed_integer:
3280 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_INTEGER);
3283 case FT_unsigned_integer:
3284 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_INTEGER);
3288 typep = dwarf_fundamental_type (current_objfile, FT_LONG);
3291 case FT_signed_long:
3292 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG);
3295 case FT_unsigned_long:
3296 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG);
3300 typep = dwarf_fundamental_type (current_objfile, FT_LONG_LONG);
3303 case FT_signed_long_long:
3304 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG_LONG);
3307 case FT_unsigned_long_long:
3308 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG_LONG);
3312 typep = dwarf_fundamental_type (current_objfile, FT_FLOAT);
3315 case FT_dbl_prec_float:
3316 typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_FLOAT);
3319 case FT_ext_prec_float:
3320 typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_FLOAT);
3324 typep = dwarf_fundamental_type (current_objfile, FT_COMPLEX);
3327 case FT_dbl_prec_complex:
3328 typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_COMPLEX);
3331 case FT_ext_prec_complex:
3332 typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_COMPLEX);
3339 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3340 if (!(FT_lo_user <= fundtype && fundtype <= FT_hi_user))
3342 complaint (&symfile_complaints,
3343 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x",
3344 DIE_ID, DIE_NAME, fundtype);
3355 create_name -- allocate a fresh copy of a string on an obstack
3359 Given a pointer to a string and a pointer to an obstack, allocates
3360 a fresh copy of the string on the specified obstack.
3365 create_name (char *name, struct obstack *obstackp)
3370 length = strlen (name) + 1;
3371 newname = (char *) obstack_alloc (obstackp, length);
3372 strcpy (newname, name);
3380 basicdieinfo -- extract the minimal die info from raw die data
3384 void basicdieinfo (char *diep, struct dieinfo *dip,
3385 struct objfile *objfile)
3389 Given a pointer to raw DIE data, and a pointer to an instance of a
3390 die info structure, this function extracts the basic information
3391 from the DIE data required to continue processing this DIE, along
3392 with some bookkeeping information about the DIE.
3394 The information we absolutely must have includes the DIE tag,
3395 and the DIE length. If we need the sibling reference, then we
3396 will have to call completedieinfo() to process all the remaining
3399 Note that since there is no guarantee that the data is properly
3400 aligned in memory for the type of access required (indirection
3401 through anything other than a char pointer), and there is no
3402 guarantee that it is in the same byte order as the gdb host,
3403 we call a function which deals with both alignment and byte
3404 swapping issues. Possibly inefficient, but quite portable.
3406 We also take care of some other basic things at this point, such
3407 as ensuring that the instance of the die info structure starts
3408 out completely zero'd and that curdie is initialized for use
3409 in error reporting if we have a problem with the current die.
3413 All DIE's must have at least a valid length, thus the minimum
3414 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3415 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3416 are forced to be TAG_padding DIES.
3418 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3419 that if a padding DIE is used for alignment and the amount needed is
3420 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3421 enough to align to the next alignment boundry.
3423 We do some basic sanity checking here, such as verifying that the
3424 length of the die would not cause it to overrun the recorded end of
3425 the buffer holding the DIE info. If we find a DIE that is either
3426 too small or too large, we force it's length to zero which should
3427 cause the caller to take appropriate action.
3431 basicdieinfo (struct dieinfo *dip, char *diep, struct objfile *objfile)
3434 memset (dip, 0, sizeof (struct dieinfo));
3436 dip->die_ref = dbroff + (diep - dbbase);
3437 dip->die_length = target_to_host (diep, SIZEOF_DIE_LENGTH, GET_UNSIGNED,
3439 if ((dip->die_length < SIZEOF_DIE_LENGTH) ||
3440 ((diep + dip->die_length) > (dbbase + dbsize)))
3442 complaint (&symfile_complaints,
3443 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%ld bytes)",
3444 DIE_ID, DIE_NAME, dip->die_length);
3445 dip->die_length = 0;
3447 else if (dip->die_length < (SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG))
3449 dip->die_tag = TAG_padding;
3453 diep += SIZEOF_DIE_LENGTH;
3454 dip->die_tag = target_to_host (diep, SIZEOF_DIE_TAG, GET_UNSIGNED,
3463 completedieinfo -- finish reading the information for a given DIE
3467 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3471 Given a pointer to an already partially initialized die info structure,
3472 scan the raw DIE data and finish filling in the die info structure
3473 from the various attributes found.
3475 Note that since there is no guarantee that the data is properly
3476 aligned in memory for the type of access required (indirection
3477 through anything other than a char pointer), and there is no
3478 guarantee that it is in the same byte order as the gdb host,
3479 we call a function which deals with both alignment and byte
3480 swapping issues. Possibly inefficient, but quite portable.
3484 Each time we are called, we increment the diecount variable, which
3485 keeps an approximate count of the number of dies processed for
3486 each compilation unit. This information is presented to the user
3487 if the info_verbose flag is set.
3492 completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3494 char *diep; /* Current pointer into raw DIE data */
3495 char *end; /* Terminate DIE scan here */
3496 unsigned short attr; /* Current attribute being scanned */
3497 unsigned short form; /* Form of the attribute */
3498 int nbytes; /* Size of next field to read */
3502 end = diep + dip->die_length;
3503 diep += SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG;
3506 attr = target_to_host (diep, SIZEOF_ATTRIBUTE, GET_UNSIGNED, objfile);
3507 diep += SIZEOF_ATTRIBUTE;
3508 nbytes = attribute_size (attr);
3511 complaint (&symfile_complaints,
3512 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes",
3520 dip->at_fund_type = target_to_host (diep, nbytes, GET_UNSIGNED,
3524 dip->at_ordering = target_to_host (diep, nbytes, GET_UNSIGNED,
3528 dip->at_bit_offset = target_to_host (diep, nbytes, GET_UNSIGNED,
3532 dip->at_sibling = target_to_host (diep, nbytes, GET_UNSIGNED,
3536 dip->at_stmt_list = target_to_host (diep, nbytes, GET_UNSIGNED,
3538 dip->has_at_stmt_list = 1;
3541 dip->at_low_pc = target_to_host (diep, nbytes, GET_UNSIGNED,
3543 dip->at_low_pc += baseaddr;
3544 dip->has_at_low_pc = 1;
3547 dip->at_high_pc = target_to_host (diep, nbytes, GET_UNSIGNED,
3549 dip->at_high_pc += baseaddr;
3552 dip->at_language = target_to_host (diep, nbytes, GET_UNSIGNED,
3555 case AT_user_def_type:
3556 dip->at_user_def_type = target_to_host (diep, nbytes,
3557 GET_UNSIGNED, objfile);
3560 dip->at_byte_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3562 dip->has_at_byte_size = 1;
3565 dip->at_bit_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3569 dip->at_member = target_to_host (diep, nbytes, GET_UNSIGNED,
3573 dip->at_discr = target_to_host (diep, nbytes, GET_UNSIGNED,
3577 dip->at_location = diep;
3579 case AT_mod_fund_type:
3580 dip->at_mod_fund_type = diep;
3582 case AT_subscr_data:
3583 dip->at_subscr_data = diep;
3585 case AT_mod_u_d_type:
3586 dip->at_mod_u_d_type = diep;
3588 case AT_element_list:
3589 dip->at_element_list = diep;
3590 dip->short_element_list = 0;
3592 case AT_short_element_list:
3593 dip->at_element_list = diep;
3594 dip->short_element_list = 1;
3596 case AT_discr_value:
3597 dip->at_discr_value = diep;
3599 case AT_string_length:
3600 dip->at_string_length = diep;
3603 dip->at_name = diep;
3606 /* For now, ignore any "hostname:" portion, since gdb doesn't
3607 know how to deal with it. (FIXME). */
3608 dip->at_comp_dir = strrchr (diep, ':');
3609 if (dip->at_comp_dir != NULL)
3615 dip->at_comp_dir = diep;
3619 dip->at_producer = diep;
3621 case AT_start_scope:
3622 dip->at_start_scope = target_to_host (diep, nbytes, GET_UNSIGNED,
3625 case AT_stride_size:
3626 dip->at_stride_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3630 dip->at_src_info = target_to_host (diep, nbytes, GET_UNSIGNED,
3634 dip->at_prototyped = diep;
3637 /* Found an attribute that we are unprepared to handle. However
3638 it is specifically one of the design goals of DWARF that
3639 consumers should ignore unknown attributes. As long as the
3640 form is one that we recognize (so we know how to skip it),
3641 we can just ignore the unknown attribute. */
3644 form = FORM_FROM_ATTR (attr);
3658 diep += TARGET_FT_POINTER_SIZE (objfile);
3661 diep += 2 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile);
3664 diep += 4 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile);
3667 diep += strlen (diep) + 1;
3670 unknown_attribute_form_complaint (DIE_ID, DIE_NAME, form);
3681 target_to_host -- swap in target data to host
3685 target_to_host (char *from, int nbytes, int signextend,
3686 struct objfile *objfile)
3690 Given pointer to data in target format in FROM, a byte count for
3691 the size of the data in NBYTES, a flag indicating whether or not
3692 the data is signed in SIGNEXTEND, and a pointer to the current
3693 objfile in OBJFILE, convert the data to host format and return
3694 the converted value.
3698 FIXME: If we read data that is known to be signed, and expect to
3699 use it as signed data, then we need to explicitly sign extend the
3700 result until the bfd library is able to do this for us.
3702 FIXME: Would a 32 bit target ever need an 8 byte result?
3707 target_to_host (char *from, int nbytes, int signextend, /* FIXME: Unused */
3708 struct objfile *objfile)
3715 rtnval = bfd_get_64 (objfile->obfd, (bfd_byte *) from);
3718 rtnval = bfd_get_32 (objfile->obfd, (bfd_byte *) from);
3721 rtnval = bfd_get_16 (objfile->obfd, (bfd_byte *) from);
3724 rtnval = bfd_get_8 (objfile->obfd, (bfd_byte *) from);
3727 complaint (&symfile_complaints,
3728 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object",
3729 DIE_ID, DIE_NAME, nbytes);
3740 attribute_size -- compute size of data for a DWARF attribute
3744 static int attribute_size (unsigned int attr)
3748 Given a DWARF attribute in ATTR, compute the size of the first
3749 piece of data associated with this attribute and return that
3752 Returns -1 for unrecognized attributes.
3757 attribute_size (unsigned int attr)
3759 int nbytes; /* Size of next data for this attribute */
3760 unsigned short form; /* Form of the attribute */
3762 form = FORM_FROM_ATTR (attr);
3765 case FORM_STRING: /* A variable length field is next */
3768 case FORM_DATA2: /* Next 2 byte field is the data itself */
3769 case FORM_BLOCK2: /* Next 2 byte field is a block length */
3772 case FORM_DATA4: /* Next 4 byte field is the data itself */
3773 case FORM_BLOCK4: /* Next 4 byte field is a block length */
3774 case FORM_REF: /* Next 4 byte field is a DIE offset */
3777 case FORM_DATA8: /* Next 8 byte field is the data itself */
3780 case FORM_ADDR: /* Next field size is target sizeof(void *) */
3781 nbytes = TARGET_FT_POINTER_SIZE (objfile);
3784 unknown_attribute_form_complaint (DIE_ID, DIE_NAME, form);