1 /* DWARF debugging format support for GDB.
3 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
6 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
7 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 If you are looking for DWARF-2 support, you are in the wrong file.
27 Go look in dwarf2read.c. This file is for the original DWARF,
28 also known as DWARF-1.
30 DWARF-1 is slowly headed for obsoletion.
32 In gcc HEAD 2003-11-29 16:28:31 UTC, no targets prefer dwarf-1.
34 In gcc 3.3.2, these targets prefer dwarf-1:
36 i[34567]86-sequent-ptx4*
37 i[34567]86-sequent-sysv4*
41 In gcc 3.2.2, these targets prefer dwarf-1:
44 i[34567]86-sequent-ptx4*
45 i[34567]86-sequent-sysv4*
50 In gcc 2.95.3, these targets prefer dwarf-1:
54 i[34567]86-sequent-ptx4*
55 i[34567]86-sequent-sysv4*
57 i[34567]86-*-sco3.2v5*
73 Some non-gcc compilers produce dwarf-1:
75 PR gdb/1179 was from a user with Diab C++ 4.3.
76 Other users have also reported using Diab compilers with dwarf-1.
77 On 2003-06-09 the gdb list received a report from a user
78 with Absoft ProFortran f77 which is dwarf-1.
80 -- chastain 2003-12-01
85 FIXME: Do we need to generate dependencies in partial symtabs?
86 (Perhaps we don't need to).
88 FIXME: Resolve minor differences between what information we put in the
89 partial symbol table and what dbxread puts in. For example, we don't yet
90 put enum constants there. And dbxread seems to invent a lot of typedefs
91 we never see. Use the new printpsym command to see the partial symbol table
94 FIXME: Figure out a better way to tell gdb about the name of the function
95 contain the user's entry point (I.E. main())
97 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
98 other things to work on, if you get bored. :-)
104 #include "gdbtypes.h"
106 #include "objfiles.h"
107 #include "elf/dwarf.h"
108 #include "buildsym.h"
109 #include "demangle.h"
110 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
111 #include "language.h"
112 #include "complaints.h"
115 #include "gdb_string.h"
117 /* Some macros to provide DIE info for complaints. */
119 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
120 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
122 /* Complaints that can be issued during DWARF debug info reading. */
125 bad_die_ref_complaint (int arg1, const char *arg2, int arg3)
127 complaint (&symfile_complaints,
128 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit",
133 unknown_attribute_form_complaint (int arg1, const char *arg2, int arg3)
135 complaint (&symfile_complaints,
136 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", arg1, arg2,
141 dup_user_type_definition_complaint (int arg1, const char *arg2)
143 complaint (&symfile_complaints,
144 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition",
149 bad_array_element_type_complaint (int arg1, const char *arg2, int arg3)
151 complaint (&symfile_complaints,
152 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", arg1,
156 typedef unsigned int DIE_REF; /* Reference to a DIE */
159 #define GCC_PRODUCER "GNU C "
162 #ifndef GPLUS_PRODUCER
163 #define GPLUS_PRODUCER "GNU C++ "
167 #define LCC_PRODUCER "NCR C/C++"
170 /* Flags to target_to_host() that tell whether or not the data object is
171 expected to be signed. Used, for example, when fetching a signed
172 integer in the target environment which is used as a signed integer
173 in the host environment, and the two environments have different sized
174 ints. In this case, *somebody* has to sign extend the smaller sized
177 #define GET_UNSIGNED 0 /* No sign extension required */
178 #define GET_SIGNED 1 /* Sign extension required */
180 /* Defines for things which are specified in the document "DWARF Debugging
181 Information Format" published by UNIX International, Programming Languages
182 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
184 #define SIZEOF_DIE_LENGTH 4
185 #define SIZEOF_DIE_TAG 2
186 #define SIZEOF_ATTRIBUTE 2
187 #define SIZEOF_FORMAT_SPECIFIER 1
188 #define SIZEOF_FMT_FT 2
189 #define SIZEOF_LINETBL_LENGTH 4
190 #define SIZEOF_LINETBL_LINENO 4
191 #define SIZEOF_LINETBL_STMT 2
192 #define SIZEOF_LINETBL_DELTA 4
193 #define SIZEOF_LOC_ATOM_CODE 1
195 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
197 /* Macros that return the sizes of various types of data in the target
200 FIXME: Currently these are just compile time constants (as they are in
201 other parts of gdb as well). They need to be able to get the right size
202 either from the bfd or possibly from the DWARF info. It would be nice if
203 the DWARF producer inserted DIES that describe the fundamental types in
204 the target environment into the DWARF info, similar to the way dbx stabs
205 producers produce information about their fundamental types. */
207 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
208 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
210 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
211 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
212 However, the Issue 2 DWARF specification from AT&T defines it as
213 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
214 For backwards compatibility with the AT&T compiler produced executables
215 we define AT_short_element_list for this variant. */
217 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
219 /* The DWARF debugging information consists of two major pieces,
220 one is a block of DWARF Information Entries (DIE's) and the other
221 is a line number table. The "struct dieinfo" structure contains
222 the information for a single DIE, the one currently being processed.
224 In order to make it easier to randomly access the attribute fields
225 of the current DIE, which are specifically unordered within the DIE,
226 each DIE is scanned and an instance of the "struct dieinfo"
227 structure is initialized.
229 Initialization is done in two levels. The first, done by basicdieinfo(),
230 just initializes those fields that are vital to deciding whether or not
231 to use this DIE, how to skip past it, etc. The second, done by the
232 function completedieinfo(), fills in the rest of the information.
234 Attributes which have block forms are not interpreted at the time
235 the DIE is scanned, instead we just save pointers to the start
236 of their value fields.
238 Some fields have a flag <name>_p that is set when the value of the
239 field is valid (I.E. we found a matching attribute in the DIE). Since
240 we may want to test for the presence of some attributes in the DIE,
241 such as AT_low_pc, without restricting the values of the field,
242 we need someway to note that we found such an attribute.
250 char *die; /* Pointer to the raw DIE data */
251 unsigned long die_length; /* Length of the raw DIE data */
252 DIE_REF die_ref; /* Offset of this DIE */
253 unsigned short die_tag; /* Tag for this DIE */
254 unsigned long at_padding;
255 unsigned long at_sibling;
258 unsigned short at_fund_type;
259 BLOCK *at_mod_fund_type;
260 unsigned long at_user_def_type;
261 BLOCK *at_mod_u_d_type;
262 unsigned short at_ordering;
263 BLOCK *at_subscr_data;
264 unsigned long at_byte_size;
265 unsigned short at_bit_offset;
266 unsigned long at_bit_size;
267 BLOCK *at_element_list;
268 unsigned long at_stmt_list;
270 CORE_ADDR at_high_pc;
271 unsigned long at_language;
272 unsigned long at_member;
273 unsigned long at_discr;
274 BLOCK *at_discr_value;
275 BLOCK *at_string_length;
278 unsigned long at_start_scope;
279 unsigned long at_stride_size;
280 unsigned long at_src_info;
282 unsigned int has_at_low_pc:1;
283 unsigned int has_at_stmt_list:1;
284 unsigned int has_at_byte_size:1;
285 unsigned int short_element_list:1;
287 /* Kludge to identify register variables */
291 /* Kludge to identify optimized out variables */
293 unsigned int optimized_out;
295 /* Kludge to identify basereg references.
296 Nonzero if we have an offset relative to a basereg. */
300 /* Kludge to identify which base register is it relative to. */
302 unsigned int basereg;
305 static int diecount; /* Approximate count of dies for compilation unit */
306 static struct dieinfo *curdie; /* For warnings and such */
308 static char *dbbase; /* Base pointer to dwarf info */
309 static int dbsize; /* Size of dwarf info in bytes */
310 static int dbroff; /* Relative offset from start of .debug section */
311 static char *lnbase; /* Base pointer to line section */
313 /* This value is added to each symbol value. FIXME: Generalize to
314 the section_offsets structure used by dbxread (once this is done,
315 pass the appropriate section number to end_symtab). */
316 static CORE_ADDR baseaddr; /* Add to each symbol value */
318 /* The section offsets used in the current psymtab or symtab. FIXME,
319 only used to pass one value (baseaddr) at the moment. */
320 static struct section_offsets *base_section_offsets;
322 /* We put a pointer to this structure in the read_symtab_private field
327 /* Always the absolute file offset to the start of the ".debug"
328 section for the file containing the DIE's being accessed. */
330 /* Relative offset from the start of the ".debug" section to the
331 first DIE to be accessed. When building the partial symbol
332 table, this value will be zero since we are accessing the
333 entire ".debug" section. When expanding a partial symbol
334 table entry, this value will be the offset to the first
335 DIE for the compilation unit containing the symbol that
336 triggers the expansion. */
338 /* The size of the chunk of DIE's being examined, in bytes. */
340 /* The absolute file offset to the line table fragment. Ignored
341 when building partial symbol tables, but used when expanding
342 them, and contains the absolute file offset to the fragment
343 of the ".line" section containing the line numbers for the
344 current compilation unit. */
348 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
349 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
350 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
351 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
353 /* The generic symbol table building routines have separate lists for
354 file scope symbols and all all other scopes (local scopes). So
355 we need to select the right one to pass to add_symbol_to_list().
356 We do it by keeping a pointer to the correct list in list_in_scope.
358 FIXME: The original dwarf code just treated the file scope as the first
359 local scope, and all other local scopes as nested local scopes, and worked
360 fine. Check to see if we really need to distinguish these in buildsym.c */
362 struct pending **list_in_scope = &file_symbols;
364 /* DIES which have user defined types or modified user defined types refer to
365 other DIES for the type information. Thus we need to associate the offset
366 of a DIE for a user defined type with a pointer to the type information.
368 Originally this was done using a simple but expensive algorithm, with an
369 array of unsorted structures, each containing an offset/type-pointer pair.
370 This array was scanned linearly each time a lookup was done. The result
371 was that gdb was spending over half it's startup time munging through this
372 array of pointers looking for a structure that had the right offset member.
374 The second attempt used the same array of structures, but the array was
375 sorted using qsort each time a new offset/type was recorded, and a binary
376 search was used to find the type pointer for a given DIE offset. This was
377 even slower, due to the overhead of sorting the array each time a new
378 offset/type pair was entered.
380 The third attempt uses a fixed size array of type pointers, indexed by a
381 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
382 we can divide any DIE offset by 4 to obtain a unique index into this fixed
383 size array. Since each element is a 4 byte pointer, it takes exactly as
384 much memory to hold this array as to hold the DWARF info for a given
385 compilation unit. But it gets freed as soon as we are done with it.
386 This has worked well in practice, as a reasonable tradeoff between memory
387 consumption and speed, without having to resort to much more complicated
390 static struct type **utypes; /* Pointer to array of user type pointers */
391 static int numutypes; /* Max number of user type pointers */
393 /* Maintain an array of referenced fundamental types for the current
394 compilation unit being read. For DWARF version 1, we have to construct
395 the fundamental types on the fly, since no information about the
396 fundamental types is supplied. Each such fundamental type is created by
397 calling a language dependent routine to create the type, and then a
398 pointer to that type is then placed in the array at the index specified
399 by it's FT_<TYPENAME> value. The array has a fixed size set by the
400 FT_NUM_MEMBERS compile time constant, which is the number of predefined
401 fundamental types gdb knows how to construct. */
403 static struct type *ftypes[FT_NUM_MEMBERS]; /* Fundamental types */
405 /* Record the language for the compilation unit which is currently being
406 processed. We know it once we have seen the TAG_compile_unit DIE,
407 and we need it while processing the DIE's for that compilation unit.
408 It is eventually saved in the symtab structure, but we don't finalize
409 the symtab struct until we have processed all the DIE's for the
410 compilation unit. We also need to get and save a pointer to the
411 language struct for this language, so we can call the language
412 dependent routines for doing things such as creating fundamental
415 static enum language cu_language;
416 static const struct language_defn *cu_language_defn;
418 /* Forward declarations of static functions so we don't have to worry
419 about ordering within this file. */
421 static void free_utypes (void *);
423 static int attribute_size (unsigned int);
425 static CORE_ADDR target_to_host (char *, int, int, struct objfile *);
427 static void add_enum_psymbol (struct dieinfo *, struct objfile *);
429 static void handle_producer (char *);
431 static void read_file_scope (struct dieinfo *, char *, char *,
434 static void read_func_scope (struct dieinfo *, char *, char *,
437 static void read_lexical_block_scope (struct dieinfo *, char *, char *,
440 static void scan_partial_symbols (char *, char *, struct objfile *);
442 static void scan_compilation_units (char *, char *, file_ptr, file_ptr,
445 static void add_partial_symbol (struct dieinfo *, struct objfile *);
447 static void basicdieinfo (struct dieinfo *, char *, struct objfile *);
449 static void completedieinfo (struct dieinfo *, struct objfile *);
451 static void dwarf_psymtab_to_symtab (struct partial_symtab *);
453 static void psymtab_to_symtab_1 (struct partial_symtab *);
455 static void read_ofile_symtab (struct partial_symtab *);
457 static void process_dies (char *, char *, struct objfile *);
459 static void read_structure_scope (struct dieinfo *, char *, char *,
462 static struct type *decode_array_element_type (char *);
464 static struct type *decode_subscript_data_item (char *, char *);
466 static void dwarf_read_array_type (struct dieinfo *);
468 static void read_tag_pointer_type (struct dieinfo *dip);
470 static void read_tag_string_type (struct dieinfo *dip);
472 static void read_subroutine_type (struct dieinfo *, char *, char *);
474 static void read_enumeration (struct dieinfo *, char *, char *,
477 static struct type *struct_type (struct dieinfo *, char *, char *,
480 static struct type *enum_type (struct dieinfo *, struct objfile *);
482 static void decode_line_numbers (char *);
484 static struct type *decode_die_type (struct dieinfo *);
486 static struct type *decode_mod_fund_type (char *);
488 static struct type *decode_mod_u_d_type (char *);
490 static struct type *decode_modified_type (char *, unsigned int, int);
492 static struct type *decode_fund_type (unsigned int);
494 static char *create_name (char *, struct obstack *);
496 static struct type *lookup_utype (DIE_REF);
498 static struct type *alloc_utype (DIE_REF, struct type *);
500 static struct symbol *new_symbol (struct dieinfo *, struct objfile *);
502 static void synthesize_typedef (struct dieinfo *, struct objfile *,
505 static int locval (struct dieinfo *);
507 static void set_cu_language (struct dieinfo *);
509 static struct type *dwarf_fundamental_type (struct objfile *, int);
516 dwarf_fundamental_type -- lookup or create a fundamental type
521 dwarf_fundamental_type (struct objfile *objfile, int typeid)
525 DWARF version 1 doesn't supply any fundamental type information,
526 so gdb has to construct such types. It has a fixed number of
527 fundamental types that it knows how to construct, which is the
528 union of all types that it knows how to construct for all languages
529 that it knows about. These are enumerated in gdbtypes.h.
531 As an example, assume we find a DIE that references a DWARF
532 fundamental type of FT_integer. We first look in the ftypes
533 array to see if we already have such a type, indexed by the
534 gdb internal value of FT_INTEGER. If so, we simply return a
535 pointer to that type. If not, then we ask an appropriate
536 language dependent routine to create a type FT_INTEGER, using
537 defaults reasonable for the current target machine, and install
538 that type in ftypes for future reference.
542 Pointer to a fundamental type.
547 dwarf_fundamental_type (struct objfile *objfile, int typeid)
549 if (typeid < 0 || typeid >= FT_NUM_MEMBERS)
551 error ("internal error - invalid fundamental type id %d", typeid);
554 /* Look for this particular type in the fundamental type vector. If one is
555 not found, create and install one appropriate for the current language
556 and the current target machine. */
558 if (ftypes[typeid] == NULL)
560 ftypes[typeid] = cu_language_defn->la_fund_type (objfile, typeid);
563 return (ftypes[typeid]);
570 set_cu_language -- set local copy of language for compilation unit
575 set_cu_language (struct dieinfo *dip)
579 Decode the language attribute for a compilation unit DIE and
580 remember what the language was. We use this at various times
581 when processing DIE's for a given compilation unit.
590 set_cu_language (struct dieinfo *dip)
592 switch (dip->at_language)
596 cu_language = language_c;
598 case LANG_C_PLUS_PLUS:
599 cu_language = language_cplus;
602 cu_language = language_m2;
606 cu_language = language_fortran;
612 /* We don't know anything special about these yet. */
613 cu_language = language_unknown;
616 /* If no at_language, try to deduce one from the filename */
617 cu_language = deduce_language_from_filename (dip->at_name);
620 cu_language_defn = language_def (cu_language);
627 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
631 void dwarf_build_psymtabs (struct objfile *objfile,
632 int mainline, file_ptr dbfoff, unsigned int dbfsize,
633 file_ptr lnoffset, unsigned int lnsize)
637 This function is called upon to build partial symtabs from files
638 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
640 It is passed a bfd* containing the DIES
641 and line number information, the corresponding filename for that
642 file, a base address for relocating the symbols, a flag indicating
643 whether or not this debugging information is from a "main symbol
644 table" rather than a shared library or dynamically linked file,
645 and file offset/size pairs for the DIE information and line number
655 dwarf_build_psymtabs (struct objfile *objfile, int mainline, file_ptr dbfoff,
656 unsigned int dbfsize, file_ptr lnoffset,
659 bfd *abfd = objfile->obfd;
660 struct cleanup *back_to;
662 current_objfile = objfile;
664 dbbase = xmalloc (dbsize);
666 if ((bfd_seek (abfd, dbfoff, SEEK_SET) != 0) ||
667 (bfd_bread (dbbase, dbsize, abfd) != dbsize))
670 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd));
672 back_to = make_cleanup (xfree, dbbase);
674 /* If we are reinitializing, or if we have never loaded syms yet, init.
675 Since we have no idea how many DIES we are looking at, we just guess
676 some arbitrary value. */
679 || (objfile->global_psymbols.size == 0
680 && objfile->static_psymbols.size == 0))
682 init_psymbol_list (objfile, 1024);
685 /* Save the relocation factor where everybody can see it. */
687 base_section_offsets = objfile->section_offsets;
688 baseaddr = ANOFFSET (objfile->section_offsets, 0);
690 /* Follow the compilation unit sibling chain, building a partial symbol
691 table entry for each one. Save enough information about each compilation
692 unit to locate the full DWARF information later. */
694 scan_compilation_units (dbbase, dbbase + dbsize, dbfoff, lnoffset, objfile);
696 do_cleanups (back_to);
697 current_objfile = NULL;
704 read_lexical_block_scope -- process all dies in a lexical block
708 static void read_lexical_block_scope (struct dieinfo *dip,
709 char *thisdie, char *enddie)
713 Process all the DIES contained within a lexical block scope.
714 Start a new scope, process the dies, and then close the scope.
719 read_lexical_block_scope (struct dieinfo *dip, char *thisdie, char *enddie,
720 struct objfile *objfile)
722 struct context_stack *new;
724 push_context (0, dip->at_low_pc);
725 process_dies (thisdie + dip->die_length, enddie, objfile);
726 new = pop_context ();
727 if (local_symbols != NULL)
729 finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
730 dip->at_high_pc, objfile);
732 local_symbols = new->locals;
739 lookup_utype -- look up a user defined type from die reference
743 static type *lookup_utype (DIE_REF die_ref)
747 Given a DIE reference, lookup the user defined type associated with
748 that DIE, if it has been registered already. If not registered, then
749 return NULL. Alloc_utype() can be called to register an empty
750 type for this reference, which will be filled in later when the
751 actual referenced DIE is processed.
755 lookup_utype (DIE_REF die_ref)
757 struct type *type = NULL;
760 utypeidx = (die_ref - dbroff) / 4;
761 if ((utypeidx < 0) || (utypeidx >= numutypes))
763 bad_die_ref_complaint (DIE_ID, DIE_NAME, die_ref);
767 type = *(utypes + utypeidx);
777 alloc_utype -- add a user defined type for die reference
781 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
785 Given a die reference DIE_REF, and a possible pointer to a user
786 defined type UTYPEP, register that this reference has a user
787 defined type and either use the specified type in UTYPEP or
788 make a new empty type that will be filled in later.
790 We should only be called after calling lookup_utype() to verify that
791 there is not currently a type registered for DIE_REF.
795 alloc_utype (DIE_REF die_ref, struct type *utypep)
800 utypeidx = (die_ref - dbroff) / 4;
801 typep = utypes + utypeidx;
802 if ((utypeidx < 0) || (utypeidx >= numutypes))
804 utypep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
805 bad_die_ref_complaint (DIE_ID, DIE_NAME, die_ref);
807 else if (*typep != NULL)
810 complaint (&symfile_complaints,
811 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation",
818 utypep = alloc_type (current_objfile);
829 free_utypes -- free the utypes array and reset pointer & count
833 static void free_utypes (void *dummy)
837 Called via do_cleanups to free the utypes array, reset the pointer to NULL,
838 and set numutypes back to zero. This ensures that the utypes does not get
839 referenced after being freed.
843 free_utypes (void *dummy)
855 decode_die_type -- return a type for a specified die
859 static struct type *decode_die_type (struct dieinfo *dip)
863 Given a pointer to a die information structure DIP, decode the
864 type of the die and return a pointer to the decoded type. All
865 dies without specific types default to type int.
869 decode_die_type (struct dieinfo *dip)
871 struct type *type = NULL;
873 if (dip->at_fund_type != 0)
875 type = decode_fund_type (dip->at_fund_type);
877 else if (dip->at_mod_fund_type != NULL)
879 type = decode_mod_fund_type (dip->at_mod_fund_type);
881 else if (dip->at_user_def_type)
883 type = lookup_utype (dip->at_user_def_type);
886 type = alloc_utype (dip->at_user_def_type, NULL);
889 else if (dip->at_mod_u_d_type)
891 type = decode_mod_u_d_type (dip->at_mod_u_d_type);
895 type = dwarf_fundamental_type (current_objfile, FT_VOID);
904 struct_type -- compute and return the type for a struct or union
908 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
909 char *enddie, struct objfile *objfile)
913 Given pointer to a die information structure for a die which
914 defines a union or structure (and MUST define one or the other),
915 and pointers to the raw die data that define the range of dies which
916 define the members, compute and return the user defined type for the
921 struct_type (struct dieinfo *dip, char *thisdie, char *enddie,
922 struct objfile *objfile)
927 struct nextfield *next;
930 struct nextfield *list = NULL;
931 struct nextfield *new;
938 type = lookup_utype (dip->die_ref);
941 /* No forward references created an empty type, so install one now */
942 type = alloc_utype (dip->die_ref, NULL);
944 INIT_CPLUS_SPECIFIC (type);
945 switch (dip->die_tag)
948 TYPE_CODE (type) = TYPE_CODE_CLASS;
950 case TAG_structure_type:
951 TYPE_CODE (type) = TYPE_CODE_STRUCT;
954 TYPE_CODE (type) = TYPE_CODE_UNION;
957 /* Should never happen */
958 TYPE_CODE (type) = TYPE_CODE_UNDEF;
959 complaint (&symfile_complaints,
960 "DIE @ 0x%x \"%s\", missing class, structure, or union tag",
964 /* Some compilers try to be helpful by inventing "fake" names for
965 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
966 Thanks, but no thanks... */
967 if (dip->at_name != NULL
968 && *dip->at_name != '~'
969 && *dip->at_name != '.')
971 TYPE_TAG_NAME (type) = obconcat (&objfile->objfile_obstack,
972 "", "", dip->at_name);
974 /* Use whatever size is known. Zero is a valid size. We might however
975 wish to check has_at_byte_size to make sure that some byte size was
976 given explicitly, but DWARF doesn't specify that explicit sizes of
977 zero have to present, so complaining about missing sizes should
978 probably not be the default. */
979 TYPE_LENGTH (type) = dip->at_byte_size;
980 thisdie += dip->die_length;
981 while (thisdie < enddie)
983 basicdieinfo (&mbr, thisdie, objfile);
984 completedieinfo (&mbr, objfile);
985 if (mbr.die_length <= SIZEOF_DIE_LENGTH)
989 else if (mbr.at_sibling != 0)
991 nextdie = dbbase + mbr.at_sibling - dbroff;
995 nextdie = thisdie + mbr.die_length;
1000 /* Static fields can be either TAG_global_variable (GCC) or else
1001 TAG_member with no location (Diab). We could treat the latter like
1002 the former... but since we don't support the former, just avoid
1003 crashing on the latter for now. */
1004 if (mbr.at_location == NULL)
1007 /* Get space to record the next field's data. */
1008 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1011 /* Save the data. */
1013 obsavestring (mbr.at_name, strlen (mbr.at_name),
1014 &objfile->objfile_obstack);
1015 FIELD_TYPE (list->field) = decode_die_type (&mbr);
1016 FIELD_BITPOS (list->field) = 8 * locval (&mbr);
1017 FIELD_STATIC_KIND (list->field) = 0;
1018 /* Handle bit fields. */
1019 FIELD_BITSIZE (list->field) = mbr.at_bit_size;
1020 if (BITS_BIG_ENDIAN)
1022 /* For big endian bits, the at_bit_offset gives the
1023 additional bit offset from the MSB of the containing
1024 anonymous object to the MSB of the field. We don't
1025 have to do anything special since we don't need to
1026 know the size of the anonymous object. */
1027 FIELD_BITPOS (list->field) += mbr.at_bit_offset;
1031 /* For little endian bits, we need to have a non-zero
1032 at_bit_size, so that we know we are in fact dealing
1033 with a bitfield. Compute the bit offset to the MSB
1034 of the anonymous object, subtract off the number of
1035 bits from the MSB of the field to the MSB of the
1036 object, and then subtract off the number of bits of
1037 the field itself. The result is the bit offset of
1038 the LSB of the field. */
1039 if (mbr.at_bit_size > 0)
1041 if (mbr.has_at_byte_size)
1043 /* The size of the anonymous object containing
1044 the bit field is explicit, so use the
1045 indicated size (in bytes). */
1046 anonymous_size = mbr.at_byte_size;
1050 /* The size of the anonymous object containing
1051 the bit field matches the size of an object
1052 of the bit field's type. DWARF allows
1053 at_byte_size to be left out in such cases, as
1054 a debug information size optimization. */
1055 anonymous_size = TYPE_LENGTH (list->field.type);
1057 FIELD_BITPOS (list->field) +=
1058 anonymous_size * 8 - mbr.at_bit_offset - mbr.at_bit_size;
1064 process_dies (thisdie, nextdie, objfile);
1069 /* Now create the vector of fields, and record how big it is. We may
1070 not even have any fields, if this DIE was generated due to a reference
1071 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1072 set, which clues gdb in to the fact that it needs to search elsewhere
1073 for the full structure definition. */
1076 TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
1080 TYPE_NFIELDS (type) = nfields;
1081 TYPE_FIELDS (type) = (struct field *)
1082 TYPE_ALLOC (type, sizeof (struct field) * nfields);
1083 /* Copy the saved-up fields into the field vector. */
1084 for (n = nfields; list; list = list->next)
1086 TYPE_FIELD (type, --n) = list->field;
1096 read_structure_scope -- process all dies within struct or union
1100 static void read_structure_scope (struct dieinfo *dip,
1101 char *thisdie, char *enddie, struct objfile *objfile)
1105 Called when we find the DIE that starts a structure or union
1106 scope (definition) to process all dies that define the members
1107 of the structure or union. DIP is a pointer to the die info
1108 struct for the DIE that names the structure or union.
1112 Note that we need to call struct_type regardless of whether or not
1113 the DIE has an at_name attribute, since it might be an anonymous
1114 structure or union. This gets the type entered into our set of
1117 However, if the structure is incomplete (an opaque struct/union)
1118 then suppress creating a symbol table entry for it since gdb only
1119 wants to find the one with the complete definition. Note that if
1120 it is complete, we just call new_symbol, which does it's own
1121 checking about whether the struct/union is anonymous or not (and
1122 suppresses creating a symbol table entry itself).
1127 read_structure_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1128 struct objfile *objfile)
1133 type = struct_type (dip, thisdie, enddie, objfile);
1134 if (!TYPE_STUB (type))
1136 sym = new_symbol (dip, objfile);
1139 SYMBOL_TYPE (sym) = type;
1140 if (cu_language == language_cplus)
1142 synthesize_typedef (dip, objfile, type);
1152 decode_array_element_type -- decode type of the array elements
1156 static struct type *decode_array_element_type (char *scan, char *end)
1160 As the last step in decoding the array subscript information for an
1161 array DIE, we need to decode the type of the array elements. We are
1162 passed a pointer to this last part of the subscript information and
1163 must return the appropriate type. If the type attribute is not
1164 recognized, just warn about the problem and return type int.
1167 static struct type *
1168 decode_array_element_type (char *scan)
1172 unsigned short attribute;
1173 unsigned short fundtype;
1176 attribute = target_to_host (scan, SIZEOF_ATTRIBUTE, GET_UNSIGNED,
1178 scan += SIZEOF_ATTRIBUTE;
1179 nbytes = attribute_size (attribute);
1182 bad_array_element_type_complaint (DIE_ID, DIE_NAME, attribute);
1183 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1190 fundtype = target_to_host (scan, nbytes, GET_UNSIGNED,
1192 typep = decode_fund_type (fundtype);
1194 case AT_mod_fund_type:
1195 typep = decode_mod_fund_type (scan);
1197 case AT_user_def_type:
1198 die_ref = target_to_host (scan, nbytes, GET_UNSIGNED,
1200 typep = lookup_utype (die_ref);
1203 typep = alloc_utype (die_ref, NULL);
1206 case AT_mod_u_d_type:
1207 typep = decode_mod_u_d_type (scan);
1210 bad_array_element_type_complaint (DIE_ID, DIE_NAME, attribute);
1211 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1222 decode_subscript_data_item -- decode array subscript item
1226 static struct type *
1227 decode_subscript_data_item (char *scan, char *end)
1231 The array subscripts and the data type of the elements of an
1232 array are described by a list of data items, stored as a block
1233 of contiguous bytes. There is a data item describing each array
1234 dimension, and a final data item describing the element type.
1235 The data items are ordered the same as their appearance in the
1236 source (I.E. leftmost dimension first, next to leftmost second,
1239 The data items describing each array dimension consist of four
1240 parts: (1) a format specifier, (2) type type of the subscript
1241 index, (3) a description of the low bound of the array dimension,
1242 and (4) a description of the high bound of the array dimension.
1244 The last data item is the description of the type of each of
1247 We are passed a pointer to the start of the block of bytes
1248 containing the remaining data items, and a pointer to the first
1249 byte past the data. This function recursively decodes the
1250 remaining data items and returns a type.
1252 If we somehow fail to decode some data, we complain about it
1253 and return a type "array of int".
1256 FIXME: This code only implements the forms currently used
1257 by the AT&T and GNU C compilers.
1259 The end pointer is supplied for error checking, maybe we should
1263 static struct type *
1264 decode_subscript_data_item (char *scan, char *end)
1266 struct type *typep = NULL; /* Array type we are building */
1267 struct type *nexttype; /* Type of each element (may be array) */
1268 struct type *indextype; /* Type of this index */
1269 struct type *rangetype;
1270 unsigned int format;
1271 unsigned short fundtype;
1272 unsigned long lowbound;
1273 unsigned long highbound;
1276 format = target_to_host (scan, SIZEOF_FORMAT_SPECIFIER, GET_UNSIGNED,
1278 scan += SIZEOF_FORMAT_SPECIFIER;
1282 typep = decode_array_element_type (scan);
1285 fundtype = target_to_host (scan, SIZEOF_FMT_FT, GET_UNSIGNED,
1287 indextype = decode_fund_type (fundtype);
1288 scan += SIZEOF_FMT_FT;
1289 nbytes = TARGET_FT_LONG_SIZE (current_objfile);
1290 lowbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile);
1292 highbound = target_to_host (scan, nbytes, GET_UNSIGNED, current_objfile);
1294 nexttype = decode_subscript_data_item (scan, end);
1295 if (nexttype == NULL)
1297 /* Munged subscript data or other problem, fake it. */
1298 complaint (&symfile_complaints,
1299 "DIE @ 0x%x \"%s\", can't decode subscript data items",
1301 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1303 rangetype = create_range_type ((struct type *) NULL, indextype,
1304 lowbound, highbound);
1305 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1314 complaint (&symfile_complaints,
1315 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet",
1316 DIE_ID, DIE_NAME, format);
1317 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1318 rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0);
1319 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1322 complaint (&symfile_complaints,
1323 "DIE @ 0x%x \"%s\", unknown array subscript format %x", DIE_ID,
1325 nexttype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1326 rangetype = create_range_type ((struct type *) NULL, nexttype, 0, 0);
1327 typep = create_array_type ((struct type *) NULL, nexttype, rangetype);
1337 dwarf_read_array_type -- read TAG_array_type DIE
1341 static void dwarf_read_array_type (struct dieinfo *dip)
1345 Extract all information from a TAG_array_type DIE and add to
1346 the user defined type vector.
1350 dwarf_read_array_type (struct dieinfo *dip)
1356 unsigned short blocksz;
1359 if (dip->at_ordering != ORD_row_major)
1361 /* FIXME: Can gdb even handle column major arrays? */
1362 complaint (&symfile_complaints,
1363 "DIE @ 0x%x \"%s\", array not row major; not handled correctly",
1366 sub = dip->at_subscr_data;
1369 nbytes = attribute_size (AT_subscr_data);
1370 blocksz = target_to_host (sub, nbytes, GET_UNSIGNED, current_objfile);
1371 subend = sub + nbytes + blocksz;
1373 type = decode_subscript_data_item (sub, subend);
1374 utype = lookup_utype (dip->die_ref);
1377 /* Install user defined type that has not been referenced yet. */
1378 alloc_utype (dip->die_ref, type);
1380 else if (TYPE_CODE (utype) == TYPE_CODE_UNDEF)
1382 /* Ick! A forward ref has already generated a blank type in our
1383 slot, and this type probably already has things pointing to it
1384 (which is what caused it to be created in the first place).
1385 If it's just a place holder we can plop our fully defined type
1386 on top of it. We can't recover the space allocated for our
1387 new type since it might be on an obstack, but we could reuse
1388 it if we kept a list of them, but it might not be worth it
1394 /* Double ick! Not only is a type already in our slot, but
1395 someone has decorated it. Complain and leave it alone. */
1396 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1405 read_tag_pointer_type -- read TAG_pointer_type DIE
1409 static void read_tag_pointer_type (struct dieinfo *dip)
1413 Extract all information from a TAG_pointer_type DIE and add to
1414 the user defined type vector.
1418 read_tag_pointer_type (struct dieinfo *dip)
1423 type = decode_die_type (dip);
1424 utype = lookup_utype (dip->die_ref);
1427 utype = lookup_pointer_type (type);
1428 alloc_utype (dip->die_ref, utype);
1432 TYPE_TARGET_TYPE (utype) = type;
1433 TYPE_POINTER_TYPE (type) = utype;
1435 /* We assume the machine has only one representation for pointers! */
1436 /* FIXME: Possably a poor assumption */
1437 TYPE_LENGTH (utype) = TARGET_PTR_BIT / TARGET_CHAR_BIT;
1438 TYPE_CODE (utype) = TYPE_CODE_PTR;
1446 read_tag_string_type -- read TAG_string_type DIE
1450 static void read_tag_string_type (struct dieinfo *dip)
1454 Extract all information from a TAG_string_type DIE and add to
1455 the user defined type vector. It isn't really a user defined
1456 type, but it behaves like one, with other DIE's using an
1457 AT_user_def_type attribute to reference it.
1461 read_tag_string_type (struct dieinfo *dip)
1464 struct type *indextype;
1465 struct type *rangetype;
1466 unsigned long lowbound = 0;
1467 unsigned long highbound;
1469 if (dip->has_at_byte_size)
1471 /* A fixed bounds string */
1472 highbound = dip->at_byte_size - 1;
1476 /* A varying length string. Stub for now. (FIXME) */
1479 indextype = dwarf_fundamental_type (current_objfile, FT_INTEGER);
1480 rangetype = create_range_type ((struct type *) NULL, indextype, lowbound,
1483 utype = lookup_utype (dip->die_ref);
1486 /* No type defined, go ahead and create a blank one to use. */
1487 utype = alloc_utype (dip->die_ref, (struct type *) NULL);
1491 /* Already a type in our slot due to a forward reference. Make sure it
1492 is a blank one. If not, complain and leave it alone. */
1493 if (TYPE_CODE (utype) != TYPE_CODE_UNDEF)
1495 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1500 /* Create the string type using the blank type we either found or created. */
1501 utype = create_string_type (utype, rangetype);
1508 read_subroutine_type -- process TAG_subroutine_type dies
1512 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1517 Handle DIES due to C code like:
1520 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1526 The parameter DIES are currently ignored. See if gdb has a way to
1527 include this info in it's type system, and decode them if so. Is
1528 this what the type structure's "arg_types" field is for? (FIXME)
1532 read_subroutine_type (struct dieinfo *dip, char *thisdie, char *enddie)
1534 struct type *type; /* Type that this function returns */
1535 struct type *ftype; /* Function that returns above type */
1537 /* Decode the type that this subroutine returns */
1539 type = decode_die_type (dip);
1541 /* Check to see if we already have a partially constructed user
1542 defined type for this DIE, from a forward reference. */
1544 ftype = lookup_utype (dip->die_ref);
1547 /* This is the first reference to one of these types. Make
1548 a new one and place it in the user defined types. */
1549 ftype = lookup_function_type (type);
1550 alloc_utype (dip->die_ref, ftype);
1552 else if (TYPE_CODE (ftype) == TYPE_CODE_UNDEF)
1554 /* We have an existing partially constructed type, so bash it
1555 into the correct type. */
1556 TYPE_TARGET_TYPE (ftype) = type;
1557 TYPE_LENGTH (ftype) = 1;
1558 TYPE_CODE (ftype) = TYPE_CODE_FUNC;
1562 dup_user_type_definition_complaint (DIE_ID, DIE_NAME);
1570 read_enumeration -- process dies which define an enumeration
1574 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1575 char *enddie, struct objfile *objfile)
1579 Given a pointer to a die which begins an enumeration, process all
1580 the dies that define the members of the enumeration.
1584 Note that we need to call enum_type regardless of whether or not we
1585 have a symbol, since we might have an enum without a tag name (thus
1586 no symbol for the tagname).
1590 read_enumeration (struct dieinfo *dip, char *thisdie, char *enddie,
1591 struct objfile *objfile)
1596 type = enum_type (dip, objfile);
1597 sym = new_symbol (dip, objfile);
1600 SYMBOL_TYPE (sym) = type;
1601 if (cu_language == language_cplus)
1603 synthesize_typedef (dip, objfile, type);
1612 enum_type -- decode and return a type for an enumeration
1616 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1620 Given a pointer to a die information structure for the die which
1621 starts an enumeration, process all the dies that define the members
1622 of the enumeration and return a type pointer for the enumeration.
1624 At the same time, for each member of the enumeration, create a
1625 symbol for it with domain VAR_DOMAIN and class LOC_CONST,
1626 and give it the type of the enumeration itself.
1630 Note that the DWARF specification explicitly mandates that enum
1631 constants occur in reverse order from the source program order,
1632 for "consistency" and because this ordering is easier for many
1633 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1634 Entries). Because gdb wants to see the enum members in program
1635 source order, we have to ensure that the order gets reversed while
1636 we are processing them.
1639 static struct type *
1640 enum_type (struct dieinfo *dip, struct objfile *objfile)
1645 struct nextfield *next;
1648 struct nextfield *list = NULL;
1649 struct nextfield *new;
1654 unsigned short blocksz;
1657 int unsigned_enum = 1;
1659 type = lookup_utype (dip->die_ref);
1662 /* No forward references created an empty type, so install one now */
1663 type = alloc_utype (dip->die_ref, NULL);
1665 TYPE_CODE (type) = TYPE_CODE_ENUM;
1666 /* Some compilers try to be helpful by inventing "fake" names for
1667 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1668 Thanks, but no thanks... */
1669 if (dip->at_name != NULL
1670 && *dip->at_name != '~'
1671 && *dip->at_name != '.')
1673 TYPE_TAG_NAME (type) = obconcat (&objfile->objfile_obstack,
1674 "", "", dip->at_name);
1676 if (dip->at_byte_size != 0)
1678 TYPE_LENGTH (type) = dip->at_byte_size;
1680 scan = dip->at_element_list;
1683 if (dip->short_element_list)
1685 nbytes = attribute_size (AT_short_element_list);
1689 nbytes = attribute_size (AT_element_list);
1691 blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile);
1692 listend = scan + nbytes + blocksz;
1694 while (scan < listend)
1696 new = (struct nextfield *) alloca (sizeof (struct nextfield));
1699 FIELD_TYPE (list->field) = NULL;
1700 FIELD_BITSIZE (list->field) = 0;
1701 FIELD_STATIC_KIND (list->field) = 0;
1702 FIELD_BITPOS (list->field) =
1703 target_to_host (scan, TARGET_FT_LONG_SIZE (objfile), GET_SIGNED,
1705 scan += TARGET_FT_LONG_SIZE (objfile);
1706 list->field.name = obsavestring (scan, strlen (scan),
1707 &objfile->objfile_obstack);
1708 scan += strlen (scan) + 1;
1710 /* Handcraft a new symbol for this enum member. */
1711 sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack,
1712 sizeof (struct symbol));
1713 memset (sym, 0, sizeof (struct symbol));
1714 DEPRECATED_SYMBOL_NAME (sym) = create_name (list->field.name,
1715 &objfile->symbol_obstack);
1716 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language);
1717 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
1718 SYMBOL_CLASS (sym) = LOC_CONST;
1719 SYMBOL_TYPE (sym) = type;
1720 SYMBOL_VALUE (sym) = FIELD_BITPOS (list->field);
1721 if (SYMBOL_VALUE (sym) < 0)
1723 add_symbol_to_list (sym, list_in_scope);
1725 /* Now create the vector of fields, and record how big it is. This is
1726 where we reverse the order, by pulling the members off the list in
1727 reverse order from how they were inserted. If we have no fields
1728 (this is apparently possible in C++) then skip building a field
1733 TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED;
1734 TYPE_NFIELDS (type) = nfields;
1735 TYPE_FIELDS (type) = (struct field *)
1736 obstack_alloc (&objfile->symbol_obstack, sizeof (struct field) * nfields);
1737 /* Copy the saved-up fields into the field vector. */
1738 for (n = 0; (n < nfields) && (list != NULL); list = list->next)
1740 TYPE_FIELD (type, n++) = list->field;
1751 read_func_scope -- process all dies within a function scope
1755 Process all dies within a given function scope. We are passed
1756 a die information structure pointer DIP for the die which
1757 starts the function scope, and pointers into the raw die data
1758 that define the dies within the function scope.
1760 For now, we ignore lexical block scopes within the function.
1761 The problem is that AT&T cc does not define a DWARF lexical
1762 block scope for the function itself, while gcc defines a
1763 lexical block scope for the function. We need to think about
1764 how to handle this difference, or if it is even a problem.
1769 read_func_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1770 struct objfile *objfile)
1772 struct context_stack *new;
1774 /* AT_name is absent if the function is described with an
1775 AT_abstract_origin tag.
1776 Ignore the function description for now to avoid GDB core dumps.
1777 FIXME: Add code to handle AT_abstract_origin tags properly. */
1778 if (dip->at_name == NULL)
1780 complaint (&symfile_complaints, "DIE @ 0x%x, AT_name tag missing",
1785 if (objfile->ei.entry_point >= dip->at_low_pc &&
1786 objfile->ei.entry_point < dip->at_high_pc)
1788 objfile->ei.entry_func_lowpc = dip->at_low_pc;
1789 objfile->ei.entry_func_highpc = dip->at_high_pc;
1791 new = push_context (0, dip->at_low_pc);
1792 new->name = new_symbol (dip, objfile);
1793 list_in_scope = &local_symbols;
1794 process_dies (thisdie + dip->die_length, enddie, objfile);
1795 new = pop_context ();
1796 /* Make a block for the local symbols within. */
1797 finish_block (new->name, &local_symbols, new->old_blocks,
1798 new->start_addr, dip->at_high_pc, objfile);
1799 list_in_scope = &file_symbols;
1807 handle_producer -- process the AT_producer attribute
1811 Perform any operations that depend on finding a particular
1812 AT_producer attribute.
1817 handle_producer (char *producer)
1820 /* If this compilation unit was compiled with g++ or gcc, then set the
1821 processing_gcc_compilation flag. */
1823 if (DEPRECATED_STREQN (producer, GCC_PRODUCER, strlen (GCC_PRODUCER)))
1825 char version = producer[strlen (GCC_PRODUCER)];
1826 processing_gcc_compilation = (version == '2' ? 2 : 1);
1830 processing_gcc_compilation =
1831 strncmp (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER)) == 0;
1834 /* Select a demangling style if we can identify the producer and if
1835 the current style is auto. We leave the current style alone if it
1836 is not auto. We also leave the demangling style alone if we find a
1837 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1839 if (AUTO_DEMANGLING)
1841 if (DEPRECATED_STREQN (producer, GPLUS_PRODUCER, strlen (GPLUS_PRODUCER)))
1844 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't
1845 know whether it will use the old style or v3 mangling. */
1846 set_demangling_style (GNU_DEMANGLING_STYLE_STRING);
1849 else if (DEPRECATED_STREQN (producer, LCC_PRODUCER, strlen (LCC_PRODUCER)))
1851 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING);
1861 read_file_scope -- process all dies within a file scope
1865 Process all dies within a given file scope. We are passed a
1866 pointer to the die information structure for the die which
1867 starts the file scope, and pointers into the raw die data which
1868 mark the range of dies within the file scope.
1870 When the partial symbol table is built, the file offset for the line
1871 number table for each compilation unit is saved in the partial symbol
1872 table entry for that compilation unit. As the symbols for each
1873 compilation unit are read, the line number table is read into memory
1874 and the variable lnbase is set to point to it. Thus all we have to
1875 do is use lnbase to access the line number table for the current
1880 read_file_scope (struct dieinfo *dip, char *thisdie, char *enddie,
1881 struct objfile *objfile)
1883 struct cleanup *back_to;
1884 struct symtab *symtab;
1886 if (objfile->ei.entry_point >= dip->at_low_pc &&
1887 objfile->ei.entry_point < dip->at_high_pc)
1889 objfile->ei.deprecated_entry_file_lowpc = dip->at_low_pc;
1890 objfile->ei.deprecated_entry_file_highpc = dip->at_high_pc;
1892 set_cu_language (dip);
1893 if (dip->at_producer != NULL)
1895 handle_producer (dip->at_producer);
1897 numutypes = (enddie - thisdie) / 4;
1898 utypes = (struct type **) xmalloc (numutypes * sizeof (struct type *));
1899 back_to = make_cleanup (free_utypes, NULL);
1900 memset (utypes, 0, numutypes * sizeof (struct type *));
1901 memset (ftypes, 0, FT_NUM_MEMBERS * sizeof (struct type *));
1902 start_symtab (dip->at_name, dip->at_comp_dir, dip->at_low_pc);
1903 record_debugformat ("DWARF 1");
1904 decode_line_numbers (lnbase);
1905 process_dies (thisdie + dip->die_length, enddie, objfile);
1907 symtab = end_symtab (dip->at_high_pc, objfile, 0);
1910 symtab->language = cu_language;
1912 do_cleanups (back_to);
1919 process_dies -- process a range of DWARF Information Entries
1923 static void process_dies (char *thisdie, char *enddie,
1924 struct objfile *objfile)
1928 Process all DIE's in a specified range. May be (and almost
1929 certainly will be) called recursively.
1933 process_dies (char *thisdie, char *enddie, struct objfile *objfile)
1938 while (thisdie < enddie)
1940 basicdieinfo (&di, thisdie, objfile);
1941 if (di.die_length < SIZEOF_DIE_LENGTH)
1945 else if (di.die_tag == TAG_padding)
1947 nextdie = thisdie + di.die_length;
1951 completedieinfo (&di, objfile);
1952 if (di.at_sibling != 0)
1954 nextdie = dbbase + di.at_sibling - dbroff;
1958 nextdie = thisdie + di.die_length;
1960 /* I think that these are always text, not data, addresses. */
1961 di.at_low_pc = SMASH_TEXT_ADDRESS (di.at_low_pc);
1962 di.at_high_pc = SMASH_TEXT_ADDRESS (di.at_high_pc);
1965 case TAG_compile_unit:
1966 /* Skip Tag_compile_unit if we are already inside a compilation
1967 unit, we are unable to handle nested compilation units
1968 properly (FIXME). */
1969 if (current_subfile == NULL)
1970 read_file_scope (&di, thisdie, nextdie, objfile);
1972 nextdie = thisdie + di.die_length;
1974 case TAG_global_subroutine:
1975 case TAG_subroutine:
1976 if (di.has_at_low_pc)
1978 read_func_scope (&di, thisdie, nextdie, objfile);
1981 case TAG_lexical_block:
1982 read_lexical_block_scope (&di, thisdie, nextdie, objfile);
1984 case TAG_class_type:
1985 case TAG_structure_type:
1986 case TAG_union_type:
1987 read_structure_scope (&di, thisdie, nextdie, objfile);
1989 case TAG_enumeration_type:
1990 read_enumeration (&di, thisdie, nextdie, objfile);
1992 case TAG_subroutine_type:
1993 read_subroutine_type (&di, thisdie, nextdie);
1995 case TAG_array_type:
1996 dwarf_read_array_type (&di);
1998 case TAG_pointer_type:
1999 read_tag_pointer_type (&di);
2001 case TAG_string_type:
2002 read_tag_string_type (&di);
2005 new_symbol (&di, objfile);
2017 decode_line_numbers -- decode a line number table fragment
2021 static void decode_line_numbers (char *tblscan, char *tblend,
2022 long length, long base, long line, long pc)
2026 Translate the DWARF line number information to gdb form.
2028 The ".line" section contains one or more line number tables, one for
2029 each ".line" section from the objects that were linked.
2031 The AT_stmt_list attribute for each TAG_source_file entry in the
2032 ".debug" section contains the offset into the ".line" section for the
2033 start of the table for that file.
2035 The table itself has the following structure:
2037 <table length><base address><source statement entry>
2038 4 bytes 4 bytes 10 bytes
2040 The table length is the total size of the table, including the 4 bytes
2041 for the length information.
2043 The base address is the address of the first instruction generated
2044 for the source file.
2046 Each source statement entry has the following structure:
2048 <line number><statement position><address delta>
2049 4 bytes 2 bytes 4 bytes
2051 The line number is relative to the start of the file, starting with
2054 The statement position either -1 (0xFFFF) or the number of characters
2055 from the beginning of the line to the beginning of the statement.
2057 The address delta is the difference between the base address and
2058 the address of the first instruction for the statement.
2060 Note that we must copy the bytes from the packed table to our local
2061 variables before attempting to use them, to avoid alignment problems
2062 on some machines, particularly RISC processors.
2066 Does gdb expect the line numbers to be sorted? They are now by
2067 chance/luck, but are not required to be. (FIXME)
2069 The line with number 0 is unused, gdb apparently can discover the
2070 span of the last line some other way. How? (FIXME)
2074 decode_line_numbers (char *linetable)
2078 unsigned long length;
2083 if (linetable != NULL)
2085 tblscan = tblend = linetable;
2086 length = target_to_host (tblscan, SIZEOF_LINETBL_LENGTH, GET_UNSIGNED,
2088 tblscan += SIZEOF_LINETBL_LENGTH;
2090 base = target_to_host (tblscan, TARGET_FT_POINTER_SIZE (objfile),
2091 GET_UNSIGNED, current_objfile);
2092 tblscan += TARGET_FT_POINTER_SIZE (objfile);
2094 while (tblscan < tblend)
2096 line = target_to_host (tblscan, SIZEOF_LINETBL_LINENO, GET_UNSIGNED,
2098 tblscan += SIZEOF_LINETBL_LINENO + SIZEOF_LINETBL_STMT;
2099 pc = target_to_host (tblscan, SIZEOF_LINETBL_DELTA, GET_UNSIGNED,
2101 tblscan += SIZEOF_LINETBL_DELTA;
2105 record_line (current_subfile, line, pc);
2115 locval -- compute the value of a location attribute
2119 static int locval (struct dieinfo *dip)
2123 Given pointer to a string of bytes that define a location, compute
2124 the location and return the value.
2125 A location description containing no atoms indicates that the
2126 object is optimized out. The optimized_out flag is set for those,
2127 the return value is meaningless.
2129 When computing values involving the current value of the frame pointer,
2130 the value zero is used, which results in a value relative to the frame
2131 pointer, rather than the absolute value. This is what GDB wants
2134 When the result is a register number, the isreg flag is set, otherwise
2135 it is cleared. This is a kludge until we figure out a better
2136 way to handle the problem. Gdb's design does not mesh well with the
2137 DWARF notion of a location computing interpreter, which is a shame
2138 because the flexibility goes unused.
2142 Note that stack[0] is unused except as a default error return.
2143 Note that stack overflow is not yet handled.
2147 locval (struct dieinfo *dip)
2149 unsigned short nbytes;
2150 unsigned short locsize;
2151 auto long stack[64];
2158 loc = dip->at_location;
2159 nbytes = attribute_size (AT_location);
2160 locsize = target_to_host (loc, nbytes, GET_UNSIGNED, current_objfile);
2162 end = loc + locsize;
2167 dip->optimized_out = 1;
2168 loc_value_size = TARGET_FT_LONG_SIZE (current_objfile);
2171 dip->optimized_out = 0;
2172 loc_atom_code = target_to_host (loc, SIZEOF_LOC_ATOM_CODE, GET_UNSIGNED,
2174 loc += SIZEOF_LOC_ATOM_CODE;
2175 switch (loc_atom_code)
2182 /* push register (number) */
2184 = DWARF_REG_TO_REGNUM (target_to_host (loc, loc_value_size,
2187 loc += loc_value_size;
2191 /* push value of register (number) */
2192 /* Actually, we compute the value as if register has 0, so the
2193 value ends up being the offset from that register. */
2195 dip->basereg = target_to_host (loc, loc_value_size, GET_UNSIGNED,
2197 loc += loc_value_size;
2198 stack[++stacki] = 0;
2201 /* push address (relocated address) */
2202 stack[++stacki] = target_to_host (loc, loc_value_size,
2203 GET_UNSIGNED, current_objfile);
2204 loc += loc_value_size;
2207 /* push constant (number) FIXME: signed or unsigned! */
2208 stack[++stacki] = target_to_host (loc, loc_value_size,
2209 GET_SIGNED, current_objfile);
2210 loc += loc_value_size;
2213 /* pop, deref and push 2 bytes (as a long) */
2214 complaint (&symfile_complaints,
2215 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%lx not handled",
2216 DIE_ID, DIE_NAME, stack[stacki]);
2218 case OP_DEREF4: /* pop, deref and push 4 bytes (as a long) */
2219 complaint (&symfile_complaints,
2220 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%lx not handled",
2221 DIE_ID, DIE_NAME, stack[stacki]);
2223 case OP_ADD: /* pop top 2 items, add, push result */
2224 stack[stacki - 1] += stack[stacki];
2229 return (stack[stacki]);
2236 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2240 static void read_ofile_symtab (struct partial_symtab *pst)
2244 When expanding a partial symbol table entry to a full symbol table
2245 entry, this is the function that gets called to read in the symbols
2246 for the compilation unit. A pointer to the newly constructed symtab,
2247 which is now the new first one on the objfile's symtab list, is
2248 stashed in the partial symbol table entry.
2252 read_ofile_symtab (struct partial_symtab *pst)
2254 struct cleanup *back_to;
2255 unsigned long lnsize;
2258 char lnsizedata[SIZEOF_LINETBL_LENGTH];
2260 abfd = pst->objfile->obfd;
2261 current_objfile = pst->objfile;
2263 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2264 unit, seek to the location in the file, and read in all the DIE's. */
2267 dbsize = DBLENGTH (pst);
2268 dbbase = xmalloc (dbsize);
2269 dbroff = DBROFF (pst);
2270 foffset = DBFOFF (pst) + dbroff;
2271 base_section_offsets = pst->section_offsets;
2272 baseaddr = ANOFFSET (pst->section_offsets, 0);
2273 if (bfd_seek (abfd, foffset, SEEK_SET) ||
2274 (bfd_bread (dbbase, dbsize, abfd) != dbsize))
2277 error ("can't read DWARF data");
2279 back_to = make_cleanup (xfree, dbbase);
2281 /* If there is a line number table associated with this compilation unit
2282 then read the size of this fragment in bytes, from the fragment itself.
2283 Allocate a buffer for the fragment and read it in for future
2289 if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) ||
2290 (bfd_bread (lnsizedata, sizeof (lnsizedata), abfd)
2291 != sizeof (lnsizedata)))
2293 error ("can't read DWARF line number table size");
2295 lnsize = target_to_host (lnsizedata, SIZEOF_LINETBL_LENGTH,
2296 GET_UNSIGNED, pst->objfile);
2297 lnbase = xmalloc (lnsize);
2298 if (bfd_seek (abfd, LNFOFF (pst), SEEK_SET) ||
2299 (bfd_bread (lnbase, lnsize, abfd) != lnsize))
2302 error ("can't read DWARF line numbers");
2304 make_cleanup (xfree, lnbase);
2307 process_dies (dbbase, dbbase + dbsize, pst->objfile);
2308 do_cleanups (back_to);
2309 current_objfile = NULL;
2310 pst->symtab = pst->objfile->symtabs;
2317 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2321 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2325 Called once for each partial symbol table entry that needs to be
2326 expanded into a full symbol table entry.
2331 psymtab_to_symtab_1 (struct partial_symtab *pst)
2334 struct cleanup *old_chain;
2340 warning ("psymtab for %s already read in. Shouldn't happen.",
2345 /* Read in all partial symtabs on which this one is dependent */
2346 for (i = 0; i < pst->number_of_dependencies; i++)
2348 if (!pst->dependencies[i]->readin)
2350 /* Inform about additional files that need to be read in. */
2353 fputs_filtered (" ", gdb_stdout);
2355 fputs_filtered ("and ", gdb_stdout);
2357 printf_filtered ("%s...",
2358 pst->dependencies[i]->filename);
2360 gdb_flush (gdb_stdout); /* Flush output */
2362 psymtab_to_symtab_1 (pst->dependencies[i]);
2365 if (DBLENGTH (pst)) /* Otherwise it's a dummy */
2368 old_chain = make_cleanup (really_free_pendings, 0);
2369 read_ofile_symtab (pst);
2372 printf_filtered ("%d DIE's, sorting...", diecount);
2374 gdb_flush (gdb_stdout);
2376 do_cleanups (old_chain);
2387 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2391 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2395 This is the DWARF support entry point for building a full symbol
2396 table entry from a partial symbol table entry. We are passed a
2397 pointer to the partial symbol table entry that needs to be expanded.
2402 dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2409 warning ("psymtab for %s already read in. Shouldn't happen.",
2414 if (DBLENGTH (pst) || pst->number_of_dependencies)
2416 /* Print the message now, before starting serious work, to avoid
2417 disconcerting pauses. */
2420 printf_filtered ("Reading in symbols for %s...",
2422 gdb_flush (gdb_stdout);
2425 psymtab_to_symtab_1 (pst);
2427 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2428 we need to do an equivalent or is this something peculiar to
2430 Match with global symbols. This only needs to be done once,
2431 after all of the symtabs and dependencies have been read in.
2433 scan_file_globals (pst->objfile);
2436 /* Finish up the verbose info message. */
2439 printf_filtered ("done.\n");
2440 gdb_flush (gdb_stdout);
2451 add_enum_psymbol -- add enumeration members to partial symbol table
2455 Given pointer to a DIE that is known to be for an enumeration,
2456 extract the symbolic names of the enumeration members and add
2457 partial symbols for them.
2461 add_enum_psymbol (struct dieinfo *dip, struct objfile *objfile)
2465 unsigned short blocksz;
2468 scan = dip->at_element_list;
2471 if (dip->short_element_list)
2473 nbytes = attribute_size (AT_short_element_list);
2477 nbytes = attribute_size (AT_element_list);
2479 blocksz = target_to_host (scan, nbytes, GET_UNSIGNED, objfile);
2481 listend = scan + blocksz;
2482 while (scan < listend)
2484 scan += TARGET_FT_LONG_SIZE (objfile);
2485 add_psymbol_to_list (scan, strlen (scan), VAR_DOMAIN, LOC_CONST,
2486 &objfile->static_psymbols, 0, 0, cu_language,
2488 scan += strlen (scan) + 1;
2497 add_partial_symbol -- add symbol to partial symbol table
2501 Given a DIE, if it is one of the types that we want to
2502 add to a partial symbol table, finish filling in the die info
2503 and then add a partial symbol table entry for it.
2507 The caller must ensure that the DIE has a valid name attribute.
2511 add_partial_symbol (struct dieinfo *dip, struct objfile *objfile)
2513 switch (dip->die_tag)
2515 case TAG_global_subroutine:
2516 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2517 VAR_DOMAIN, LOC_BLOCK,
2518 &objfile->global_psymbols,
2519 0, dip->at_low_pc, cu_language, objfile);
2521 case TAG_global_variable:
2522 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2523 VAR_DOMAIN, LOC_STATIC,
2524 &objfile->global_psymbols,
2525 0, 0, cu_language, objfile);
2527 case TAG_subroutine:
2528 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2529 VAR_DOMAIN, LOC_BLOCK,
2530 &objfile->static_psymbols,
2531 0, dip->at_low_pc, cu_language, objfile);
2533 case TAG_local_variable:
2534 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2535 VAR_DOMAIN, LOC_STATIC,
2536 &objfile->static_psymbols,
2537 0, 0, cu_language, objfile);
2540 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2541 VAR_DOMAIN, LOC_TYPEDEF,
2542 &objfile->static_psymbols,
2543 0, 0, cu_language, objfile);
2545 case TAG_class_type:
2546 case TAG_structure_type:
2547 case TAG_union_type:
2548 case TAG_enumeration_type:
2549 /* Do not add opaque aggregate definitions to the psymtab. */
2550 if (!dip->has_at_byte_size)
2552 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2553 STRUCT_DOMAIN, LOC_TYPEDEF,
2554 &objfile->static_psymbols,
2555 0, 0, cu_language, objfile);
2556 if (cu_language == language_cplus)
2558 /* For C++, these implicitly act as typedefs as well. */
2559 add_psymbol_to_list (dip->at_name, strlen (dip->at_name),
2560 VAR_DOMAIN, LOC_TYPEDEF,
2561 &objfile->static_psymbols,
2562 0, 0, cu_language, objfile);
2572 scan_partial_symbols -- scan DIE's within a single compilation unit
2576 Process the DIE's within a single compilation unit, looking for
2577 interesting DIE's that contribute to the partial symbol table entry
2578 for this compilation unit.
2582 There are some DIE's that may appear both at file scope and within
2583 the scope of a function. We are only interested in the ones at file
2584 scope, and the only way to tell them apart is to keep track of the
2585 scope. For example, consider the test case:
2590 for which the relevant DWARF segment has the structure:
2593 0x23 global subrtn sibling 0x9b
2595 fund_type FT_integer
2600 0x23 local var sibling 0x97
2602 fund_type FT_integer
2603 location OP_BASEREG 0xe
2610 0x1d local var sibling 0xb8
2612 fund_type FT_integer
2613 location OP_ADDR 0x800025dc
2618 We want to include the symbol 'i' in the partial symbol table, but
2619 not the symbol 'j'. In essence, we want to skip all the dies within
2620 the scope of a TAG_global_subroutine DIE.
2622 Don't attempt to add anonymous structures or unions since they have
2623 no name. Anonymous enumerations however are processed, because we
2624 want to extract their member names (the check for a tag name is
2627 Also, for variables and subroutines, check that this is the place
2628 where the actual definition occurs, rather than just a reference
2636 scan_partial_symbols (char *thisdie, char *enddie, struct objfile *objfile)
2642 while (thisdie < enddie)
2644 basicdieinfo (&di, thisdie, objfile);
2645 if (di.die_length < SIZEOF_DIE_LENGTH)
2651 nextdie = thisdie + di.die_length;
2652 /* To avoid getting complete die information for every die, we
2653 only do it (below) for the cases we are interested in. */
2656 case TAG_global_subroutine:
2657 case TAG_subroutine:
2658 completedieinfo (&di, objfile);
2659 if (di.at_name && (di.has_at_low_pc || di.at_location))
2661 add_partial_symbol (&di, objfile);
2662 /* If there is a sibling attribute, adjust the nextdie
2663 pointer to skip the entire scope of the subroutine.
2664 Apply some sanity checking to make sure we don't
2665 overrun or underrun the range of remaining DIE's */
2666 if (di.at_sibling != 0)
2668 temp = dbbase + di.at_sibling - dbroff;
2669 if ((temp < thisdie) || (temp >= enddie))
2671 bad_die_ref_complaint (DIE_ID, DIE_NAME,
2681 case TAG_global_variable:
2682 case TAG_local_variable:
2683 completedieinfo (&di, objfile);
2684 if (di.at_name && (di.has_at_low_pc || di.at_location))
2686 add_partial_symbol (&di, objfile);
2690 case TAG_class_type:
2691 case TAG_structure_type:
2692 case TAG_union_type:
2693 completedieinfo (&di, objfile);
2696 add_partial_symbol (&di, objfile);
2699 case TAG_enumeration_type:
2700 completedieinfo (&di, objfile);
2703 add_partial_symbol (&di, objfile);
2705 add_enum_psymbol (&di, objfile);
2717 scan_compilation_units -- build a psymtab entry for each compilation
2721 This is the top level dwarf parsing routine for building partial
2724 It scans from the beginning of the DWARF table looking for the first
2725 TAG_compile_unit DIE, and then follows the sibling chain to locate
2726 each additional TAG_compile_unit DIE.
2728 For each TAG_compile_unit DIE it creates a partial symtab structure,
2729 calls a subordinate routine to collect all the compilation unit's
2730 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2731 new partial symtab structure into the partial symbol table. It also
2732 records the appropriate information in the partial symbol table entry
2733 to allow the chunk of DIE's and line number table for this compilation
2734 unit to be located and re-read later, to generate a complete symbol
2735 table entry for the compilation unit.
2737 Thus it effectively partitions up a chunk of DIE's for multiple
2738 compilation units into smaller DIE chunks and line number tables,
2739 and associates them with a partial symbol table entry.
2743 If any compilation unit has no line number table associated with
2744 it for some reason (a missing at_stmt_list attribute, rather than
2745 just one with a value of zero, which is valid) then we ensure that
2746 the recorded file offset is zero so that the routine which later
2747 reads line number table fragments knows that there is no fragment
2757 scan_compilation_units (char *thisdie, char *enddie, file_ptr dbfoff,
2758 file_ptr lnoffset, struct objfile *objfile)
2762 struct partial_symtab *pst;
2765 file_ptr curlnoffset;
2767 while (thisdie < enddie)
2769 basicdieinfo (&di, thisdie, objfile);
2770 if (di.die_length < SIZEOF_DIE_LENGTH)
2774 else if (di.die_tag != TAG_compile_unit)
2776 nextdie = thisdie + di.die_length;
2780 completedieinfo (&di, objfile);
2781 set_cu_language (&di);
2782 if (di.at_sibling != 0)
2784 nextdie = dbbase + di.at_sibling - dbroff;
2788 nextdie = thisdie + di.die_length;
2790 curoff = thisdie - dbbase;
2791 culength = nextdie - thisdie;
2792 curlnoffset = di.has_at_stmt_list ? lnoffset + di.at_stmt_list : 0;
2794 /* First allocate a new partial symbol table structure */
2796 pst = start_psymtab_common (objfile, base_section_offsets,
2797 di.at_name, di.at_low_pc,
2798 objfile->global_psymbols.next,
2799 objfile->static_psymbols.next);
2801 pst->texthigh = di.at_high_pc;
2802 pst->read_symtab_private = (char *)
2803 obstack_alloc (&objfile->psymbol_obstack,
2804 sizeof (struct dwfinfo));
2805 DBFOFF (pst) = dbfoff;
2806 DBROFF (pst) = curoff;
2807 DBLENGTH (pst) = culength;
2808 LNFOFF (pst) = curlnoffset;
2809 pst->read_symtab = dwarf_psymtab_to_symtab;
2811 /* Now look for partial symbols */
2813 scan_partial_symbols (thisdie + di.die_length, nextdie, objfile);
2815 pst->n_global_syms = objfile->global_psymbols.next -
2816 (objfile->global_psymbols.list + pst->globals_offset);
2817 pst->n_static_syms = objfile->static_psymbols.next -
2818 (objfile->static_psymbols.list + pst->statics_offset);
2819 sort_pst_symbols (pst);
2820 /* If there is already a psymtab or symtab for a file of this name,
2821 remove it. (If there is a symtab, more drastic things also
2822 happen.) This happens in VxWorks. */
2823 free_named_symtabs (pst->filename);
2833 new_symbol -- make a symbol table entry for a new symbol
2837 static struct symbol *new_symbol (struct dieinfo *dip,
2838 struct objfile *objfile)
2842 Given a pointer to a DWARF information entry, figure out if we need
2843 to make a symbol table entry for it, and if so, create a new entry
2844 and return a pointer to it.
2847 static struct symbol *
2848 new_symbol (struct dieinfo *dip, struct objfile *objfile)
2850 struct symbol *sym = NULL;
2852 if (dip->at_name != NULL)
2854 sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack,
2855 sizeof (struct symbol));
2856 OBJSTAT (objfile, n_syms++);
2857 memset (sym, 0, sizeof (struct symbol));
2858 /* default assumptions */
2859 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2860 SYMBOL_CLASS (sym) = LOC_STATIC;
2861 SYMBOL_TYPE (sym) = decode_die_type (dip);
2863 /* If this symbol is from a C++ compilation, then attempt to cache the
2864 demangled form for future reference. This is a typical time versus
2865 space tradeoff, that was decided in favor of time because it sped up
2866 C++ symbol lookups by a factor of about 20. */
2868 SYMBOL_LANGUAGE (sym) = cu_language;
2869 SYMBOL_SET_NAMES (sym, dip->at_name, strlen (dip->at_name), objfile);
2870 switch (dip->die_tag)
2873 SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc;
2874 SYMBOL_CLASS (sym) = LOC_LABEL;
2876 case TAG_global_subroutine:
2877 case TAG_subroutine:
2878 SYMBOL_VALUE_ADDRESS (sym) = dip->at_low_pc;
2879 SYMBOL_TYPE (sym) = lookup_function_type (SYMBOL_TYPE (sym));
2880 if (dip->at_prototyped)
2881 TYPE_FLAGS (SYMBOL_TYPE (sym)) |= TYPE_FLAG_PROTOTYPED;
2882 SYMBOL_CLASS (sym) = LOC_BLOCK;
2883 if (dip->die_tag == TAG_global_subroutine)
2885 add_symbol_to_list (sym, &global_symbols);
2889 add_symbol_to_list (sym, list_in_scope);
2892 case TAG_global_variable:
2893 if (dip->at_location != NULL)
2895 SYMBOL_VALUE_ADDRESS (sym) = locval (dip);
2896 add_symbol_to_list (sym, &global_symbols);
2897 SYMBOL_CLASS (sym) = LOC_STATIC;
2898 SYMBOL_VALUE (sym) += baseaddr;
2901 case TAG_local_variable:
2902 if (dip->at_location != NULL)
2904 int loc = locval (dip);
2905 if (dip->optimized_out)
2907 SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT;
2909 else if (dip->isreg)
2911 SYMBOL_CLASS (sym) = LOC_REGISTER;
2913 else if (dip->offreg)
2915 SYMBOL_CLASS (sym) = LOC_BASEREG;
2916 SYMBOL_BASEREG (sym) = dip->basereg;
2920 SYMBOL_CLASS (sym) = LOC_STATIC;
2921 SYMBOL_VALUE (sym) += baseaddr;
2923 if (SYMBOL_CLASS (sym) == LOC_STATIC)
2925 /* LOC_STATIC address class MUST use SYMBOL_VALUE_ADDRESS,
2926 which may store to a bigger location than SYMBOL_VALUE. */
2927 SYMBOL_VALUE_ADDRESS (sym) = loc;
2931 SYMBOL_VALUE (sym) = loc;
2933 add_symbol_to_list (sym, list_in_scope);
2936 case TAG_formal_parameter:
2937 if (dip->at_location != NULL)
2939 SYMBOL_VALUE (sym) = locval (dip);
2941 add_symbol_to_list (sym, list_in_scope);
2944 SYMBOL_CLASS (sym) = LOC_REGPARM;
2946 else if (dip->offreg)
2948 SYMBOL_CLASS (sym) = LOC_BASEREG_ARG;
2949 SYMBOL_BASEREG (sym) = dip->basereg;
2953 SYMBOL_CLASS (sym) = LOC_ARG;
2956 case TAG_unspecified_parameters:
2957 /* From varargs functions; gdb doesn't seem to have any interest in
2958 this information, so just ignore it for now. (FIXME?) */
2960 case TAG_class_type:
2961 case TAG_structure_type:
2962 case TAG_union_type:
2963 case TAG_enumeration_type:
2964 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
2965 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
2966 add_symbol_to_list (sym, list_in_scope);
2969 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
2970 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
2971 add_symbol_to_list (sym, list_in_scope);
2974 /* Not a tag we recognize. Hopefully we aren't processing trash
2975 data, but since we must specifically ignore things we don't
2976 recognize, there is nothing else we should do at this point. */
2987 synthesize_typedef -- make a symbol table entry for a "fake" typedef
2991 static void synthesize_typedef (struct dieinfo *dip,
2992 struct objfile *objfile,
2997 Given a pointer to a DWARF information entry, synthesize a typedef
2998 for the name in the DIE, using the specified type.
3000 This is used for C++ class, structs, unions, and enumerations to
3001 set up the tag name as a type.
3006 synthesize_typedef (struct dieinfo *dip, struct objfile *objfile,
3009 struct symbol *sym = NULL;
3011 if (dip->at_name != NULL)
3013 sym = (struct symbol *)
3014 obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol));
3015 OBJSTAT (objfile, n_syms++);
3016 memset (sym, 0, sizeof (struct symbol));
3017 DEPRECATED_SYMBOL_NAME (sym) = create_name (dip->at_name,
3018 &objfile->symbol_obstack);
3019 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym, cu_language);
3020 SYMBOL_TYPE (sym) = type;
3021 SYMBOL_CLASS (sym) = LOC_TYPEDEF;
3022 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
3023 add_symbol_to_list (sym, list_in_scope);
3031 decode_mod_fund_type -- decode a modified fundamental type
3035 static struct type *decode_mod_fund_type (char *typedata)
3039 Decode a block of data containing a modified fundamental
3040 type specification. TYPEDATA is a pointer to the block,
3041 which starts with a length containing the size of the rest
3042 of the block. At the end of the block is a fundmental type
3043 code value that gives the fundamental type. Everything
3044 in between are type modifiers.
3046 We simply compute the number of modifiers and call the general
3047 function decode_modified_type to do the actual work.
3050 static struct type *
3051 decode_mod_fund_type (char *typedata)
3053 struct type *typep = NULL;
3054 unsigned short modcount;
3057 /* Get the total size of the block, exclusive of the size itself */
3059 nbytes = attribute_size (AT_mod_fund_type);
3060 modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile);
3063 /* Deduct the size of the fundamental type bytes at the end of the block. */
3065 modcount -= attribute_size (AT_fund_type);
3067 /* Now do the actual decoding */
3069 typep = decode_modified_type (typedata, modcount, AT_mod_fund_type);
3077 decode_mod_u_d_type -- decode a modified user defined type
3081 static struct type *decode_mod_u_d_type (char *typedata)
3085 Decode a block of data containing a modified user defined
3086 type specification. TYPEDATA is a pointer to the block,
3087 which consists of a two byte length, containing the size
3088 of the rest of the block. At the end of the block is a
3089 four byte value that gives a reference to a user defined type.
3090 Everything in between are type modifiers.
3092 We simply compute the number of modifiers and call the general
3093 function decode_modified_type to do the actual work.
3096 static struct type *
3097 decode_mod_u_d_type (char *typedata)
3099 struct type *typep = NULL;
3100 unsigned short modcount;
3103 /* Get the total size of the block, exclusive of the size itself */
3105 nbytes = attribute_size (AT_mod_u_d_type);
3106 modcount = target_to_host (typedata, nbytes, GET_UNSIGNED, current_objfile);
3109 /* Deduct the size of the reference type bytes at the end of the block. */
3111 modcount -= attribute_size (AT_user_def_type);
3113 /* Now do the actual decoding */
3115 typep = decode_modified_type (typedata, modcount, AT_mod_u_d_type);
3123 decode_modified_type -- decode modified user or fundamental type
3127 static struct type *decode_modified_type (char *modifiers,
3128 unsigned short modcount, int mtype)
3132 Decode a modified type, either a modified fundamental type or
3133 a modified user defined type. MODIFIERS is a pointer to the
3134 block of bytes that define MODCOUNT modifiers. Immediately
3135 following the last modifier is a short containing the fundamental
3136 type or a long containing the reference to the user defined
3137 type. Which one is determined by MTYPE, which is either
3138 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3139 type we are generating.
3141 We call ourself recursively to generate each modified type,`
3142 until MODCOUNT reaches zero, at which point we have consumed
3143 all the modifiers and generate either the fundamental type or
3144 user defined type. When the recursion unwinds, each modifier
3145 is applied in turn to generate the full modified type.
3149 If we find a modifier that we don't recognize, and it is not one
3150 of those reserved for application specific use, then we issue a
3151 warning and simply ignore the modifier.
3155 We currently ignore MOD_const and MOD_volatile. (FIXME)
3159 static struct type *
3160 decode_modified_type (char *modifiers, unsigned int modcount, int mtype)
3162 struct type *typep = NULL;
3163 unsigned short fundtype;
3172 case AT_mod_fund_type:
3173 nbytes = attribute_size (AT_fund_type);
3174 fundtype = target_to_host (modifiers, nbytes, GET_UNSIGNED,
3176 typep = decode_fund_type (fundtype);
3178 case AT_mod_u_d_type:
3179 nbytes = attribute_size (AT_user_def_type);
3180 die_ref = target_to_host (modifiers, nbytes, GET_UNSIGNED,
3182 typep = lookup_utype (die_ref);
3185 typep = alloc_utype (die_ref, NULL);
3189 complaint (&symfile_complaints,
3190 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)",
3191 DIE_ID, DIE_NAME, mtype);
3192 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3198 modifier = *modifiers++;
3199 typep = decode_modified_type (modifiers, --modcount, mtype);
3202 case MOD_pointer_to:
3203 typep = lookup_pointer_type (typep);
3205 case MOD_reference_to:
3206 typep = lookup_reference_type (typep);
3209 complaint (&symfile_complaints,
3210 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", DIE_ID,
3211 DIE_NAME); /* FIXME */
3214 complaint (&symfile_complaints,
3215 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored",
3216 DIE_ID, DIE_NAME); /* FIXME */
3219 if (!(MOD_lo_user <= (unsigned char) modifier))
3221 /* This part of the test would always be true, and it triggers a compiler
3223 && (unsigned char) modifier <= MOD_hi_user))
3226 complaint (&symfile_complaints,
3227 "DIE @ 0x%x \"%s\", unknown type modifier %u", DIE_ID,
3228 DIE_NAME, modifier);
3240 decode_fund_type -- translate basic DWARF type to gdb base type
3244 Given an integer that is one of the fundamental DWARF types,
3245 translate it to one of the basic internal gdb types and return
3246 a pointer to the appropriate gdb type (a "struct type *").
3250 For robustness, if we are asked to translate a fundamental
3251 type that we are unprepared to deal with, we return int so
3252 callers can always depend upon a valid type being returned,
3253 and so gdb may at least do something reasonable by default.
3254 If the type is not in the range of those types defined as
3255 application specific types, we also issue a warning.
3258 static struct type *
3259 decode_fund_type (unsigned int fundtype)
3261 struct type *typep = NULL;
3267 typep = dwarf_fundamental_type (current_objfile, FT_VOID);
3270 case FT_boolean: /* Was FT_set in AT&T version */
3271 typep = dwarf_fundamental_type (current_objfile, FT_BOOLEAN);
3274 case FT_pointer: /* (void *) */
3275 typep = dwarf_fundamental_type (current_objfile, FT_VOID);
3276 typep = lookup_pointer_type (typep);
3280 typep = dwarf_fundamental_type (current_objfile, FT_CHAR);
3283 case FT_signed_char:
3284 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_CHAR);
3287 case FT_unsigned_char:
3288 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_CHAR);
3292 typep = dwarf_fundamental_type (current_objfile, FT_SHORT);
3295 case FT_signed_short:
3296 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_SHORT);
3299 case FT_unsigned_short:
3300 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_SHORT);
3304 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3307 case FT_signed_integer:
3308 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_INTEGER);
3311 case FT_unsigned_integer:
3312 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_INTEGER);
3316 typep = dwarf_fundamental_type (current_objfile, FT_LONG);
3319 case FT_signed_long:
3320 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG);
3323 case FT_unsigned_long:
3324 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG);
3328 typep = dwarf_fundamental_type (current_objfile, FT_LONG_LONG);
3331 case FT_signed_long_long:
3332 typep = dwarf_fundamental_type (current_objfile, FT_SIGNED_LONG_LONG);
3335 case FT_unsigned_long_long:
3336 typep = dwarf_fundamental_type (current_objfile, FT_UNSIGNED_LONG_LONG);
3340 typep = dwarf_fundamental_type (current_objfile, FT_FLOAT);
3343 case FT_dbl_prec_float:
3344 typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_FLOAT);
3347 case FT_ext_prec_float:
3348 typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_FLOAT);
3352 typep = dwarf_fundamental_type (current_objfile, FT_COMPLEX);
3355 case FT_dbl_prec_complex:
3356 typep = dwarf_fundamental_type (current_objfile, FT_DBL_PREC_COMPLEX);
3359 case FT_ext_prec_complex:
3360 typep = dwarf_fundamental_type (current_objfile, FT_EXT_PREC_COMPLEX);
3367 typep = dwarf_fundamental_type (current_objfile, FT_INTEGER);
3368 if (!(FT_lo_user <= fundtype && fundtype <= FT_hi_user))
3370 complaint (&symfile_complaints,
3371 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x",
3372 DIE_ID, DIE_NAME, fundtype);
3383 create_name -- allocate a fresh copy of a string on an obstack
3387 Given a pointer to a string and a pointer to an obstack, allocates
3388 a fresh copy of the string on the specified obstack.
3393 create_name (char *name, struct obstack *obstackp)
3398 length = strlen (name) + 1;
3399 newname = (char *) obstack_alloc (obstackp, length);
3400 strcpy (newname, name);
3408 basicdieinfo -- extract the minimal die info from raw die data
3412 void basicdieinfo (char *diep, struct dieinfo *dip,
3413 struct objfile *objfile)
3417 Given a pointer to raw DIE data, and a pointer to an instance of a
3418 die info structure, this function extracts the basic information
3419 from the DIE data required to continue processing this DIE, along
3420 with some bookkeeping information about the DIE.
3422 The information we absolutely must have includes the DIE tag,
3423 and the DIE length. If we need the sibling reference, then we
3424 will have to call completedieinfo() to process all the remaining
3427 Note that since there is no guarantee that the data is properly
3428 aligned in memory for the type of access required (indirection
3429 through anything other than a char pointer), and there is no
3430 guarantee that it is in the same byte order as the gdb host,
3431 we call a function which deals with both alignment and byte
3432 swapping issues. Possibly inefficient, but quite portable.
3434 We also take care of some other basic things at this point, such
3435 as ensuring that the instance of the die info structure starts
3436 out completely zero'd and that curdie is initialized for use
3437 in error reporting if we have a problem with the current die.
3441 All DIE's must have at least a valid length, thus the minimum
3442 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3443 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3444 are forced to be TAG_padding DIES.
3446 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3447 that if a padding DIE is used for alignment and the amount needed is
3448 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3449 enough to align to the next alignment boundry.
3451 We do some basic sanity checking here, such as verifying that the
3452 length of the die would not cause it to overrun the recorded end of
3453 the buffer holding the DIE info. If we find a DIE that is either
3454 too small or too large, we force it's length to zero which should
3455 cause the caller to take appropriate action.
3459 basicdieinfo (struct dieinfo *dip, char *diep, struct objfile *objfile)
3462 memset (dip, 0, sizeof (struct dieinfo));
3464 dip->die_ref = dbroff + (diep - dbbase);
3465 dip->die_length = target_to_host (diep, SIZEOF_DIE_LENGTH, GET_UNSIGNED,
3467 if ((dip->die_length < SIZEOF_DIE_LENGTH) ||
3468 ((diep + dip->die_length) > (dbbase + dbsize)))
3470 complaint (&symfile_complaints,
3471 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%ld bytes)",
3472 DIE_ID, DIE_NAME, dip->die_length);
3473 dip->die_length = 0;
3475 else if (dip->die_length < (SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG))
3477 dip->die_tag = TAG_padding;
3481 diep += SIZEOF_DIE_LENGTH;
3482 dip->die_tag = target_to_host (diep, SIZEOF_DIE_TAG, GET_UNSIGNED,
3491 completedieinfo -- finish reading the information for a given DIE
3495 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3499 Given a pointer to an already partially initialized die info structure,
3500 scan the raw DIE data and finish filling in the die info structure
3501 from the various attributes found.
3503 Note that since there is no guarantee that the data is properly
3504 aligned in memory for the type of access required (indirection
3505 through anything other than a char pointer), and there is no
3506 guarantee that it is in the same byte order as the gdb host,
3507 we call a function which deals with both alignment and byte
3508 swapping issues. Possibly inefficient, but quite portable.
3512 Each time we are called, we increment the diecount variable, which
3513 keeps an approximate count of the number of dies processed for
3514 each compilation unit. This information is presented to the user
3515 if the info_verbose flag is set.
3520 completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3522 char *diep; /* Current pointer into raw DIE data */
3523 char *end; /* Terminate DIE scan here */
3524 unsigned short attr; /* Current attribute being scanned */
3525 unsigned short form; /* Form of the attribute */
3526 int nbytes; /* Size of next field to read */
3530 end = diep + dip->die_length;
3531 diep += SIZEOF_DIE_LENGTH + SIZEOF_DIE_TAG;
3534 attr = target_to_host (diep, SIZEOF_ATTRIBUTE, GET_UNSIGNED, objfile);
3535 diep += SIZEOF_ATTRIBUTE;
3536 nbytes = attribute_size (attr);
3539 complaint (&symfile_complaints,
3540 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes",
3548 dip->at_fund_type = target_to_host (diep, nbytes, GET_UNSIGNED,
3552 dip->at_ordering = target_to_host (diep, nbytes, GET_UNSIGNED,
3556 dip->at_bit_offset = target_to_host (diep, nbytes, GET_UNSIGNED,
3560 dip->at_sibling = target_to_host (diep, nbytes, GET_UNSIGNED,
3564 dip->at_stmt_list = target_to_host (diep, nbytes, GET_UNSIGNED,
3566 dip->has_at_stmt_list = 1;
3569 dip->at_low_pc = target_to_host (diep, nbytes, GET_UNSIGNED,
3571 dip->at_low_pc += baseaddr;
3572 dip->has_at_low_pc = 1;
3575 dip->at_high_pc = target_to_host (diep, nbytes, GET_UNSIGNED,
3577 dip->at_high_pc += baseaddr;
3580 dip->at_language = target_to_host (diep, nbytes, GET_UNSIGNED,
3583 case AT_user_def_type:
3584 dip->at_user_def_type = target_to_host (diep, nbytes,
3585 GET_UNSIGNED, objfile);
3588 dip->at_byte_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3590 dip->has_at_byte_size = 1;
3593 dip->at_bit_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3597 dip->at_member = target_to_host (diep, nbytes, GET_UNSIGNED,
3601 dip->at_discr = target_to_host (diep, nbytes, GET_UNSIGNED,
3605 dip->at_location = diep;
3607 case AT_mod_fund_type:
3608 dip->at_mod_fund_type = diep;
3610 case AT_subscr_data:
3611 dip->at_subscr_data = diep;
3613 case AT_mod_u_d_type:
3614 dip->at_mod_u_d_type = diep;
3616 case AT_element_list:
3617 dip->at_element_list = diep;
3618 dip->short_element_list = 0;
3620 case AT_short_element_list:
3621 dip->at_element_list = diep;
3622 dip->short_element_list = 1;
3624 case AT_discr_value:
3625 dip->at_discr_value = diep;
3627 case AT_string_length:
3628 dip->at_string_length = diep;
3631 dip->at_name = diep;
3634 /* For now, ignore any "hostname:" portion, since gdb doesn't
3635 know how to deal with it. (FIXME). */
3636 dip->at_comp_dir = strrchr (diep, ':');
3637 if (dip->at_comp_dir != NULL)
3643 dip->at_comp_dir = diep;
3647 dip->at_producer = diep;
3649 case AT_start_scope:
3650 dip->at_start_scope = target_to_host (diep, nbytes, GET_UNSIGNED,
3653 case AT_stride_size:
3654 dip->at_stride_size = target_to_host (diep, nbytes, GET_UNSIGNED,
3658 dip->at_src_info = target_to_host (diep, nbytes, GET_UNSIGNED,
3662 dip->at_prototyped = diep;
3665 /* Found an attribute that we are unprepared to handle. However
3666 it is specifically one of the design goals of DWARF that
3667 consumers should ignore unknown attributes. As long as the
3668 form is one that we recognize (so we know how to skip it),
3669 we can just ignore the unknown attribute. */
3672 form = FORM_FROM_ATTR (attr);
3686 diep += TARGET_FT_POINTER_SIZE (objfile);
3689 diep += 2 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile);
3692 diep += 4 + target_to_host (diep, nbytes, GET_UNSIGNED, objfile);
3695 diep += strlen (diep) + 1;
3698 unknown_attribute_form_complaint (DIE_ID, DIE_NAME, form);
3709 target_to_host -- swap in target data to host
3713 target_to_host (char *from, int nbytes, int signextend,
3714 struct objfile *objfile)
3718 Given pointer to data in target format in FROM, a byte count for
3719 the size of the data in NBYTES, a flag indicating whether or not
3720 the data is signed in SIGNEXTEND, and a pointer to the current
3721 objfile in OBJFILE, convert the data to host format and return
3722 the converted value.
3726 FIXME: If we read data that is known to be signed, and expect to
3727 use it as signed data, then we need to explicitly sign extend the
3728 result until the bfd library is able to do this for us.
3730 FIXME: Would a 32 bit target ever need an 8 byte result?
3735 target_to_host (char *from, int nbytes, int signextend, /* FIXME: Unused */
3736 struct objfile *objfile)
3743 rtnval = bfd_get_64 (objfile->obfd, (bfd_byte *) from);
3746 rtnval = bfd_get_32 (objfile->obfd, (bfd_byte *) from);
3749 rtnval = bfd_get_16 (objfile->obfd, (bfd_byte *) from);
3752 rtnval = bfd_get_8 (objfile->obfd, (bfd_byte *) from);
3755 complaint (&symfile_complaints,
3756 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object",
3757 DIE_ID, DIE_NAME, nbytes);
3768 attribute_size -- compute size of data for a DWARF attribute
3772 static int attribute_size (unsigned int attr)
3776 Given a DWARF attribute in ATTR, compute the size of the first
3777 piece of data associated with this attribute and return that
3780 Returns -1 for unrecognized attributes.
3785 attribute_size (unsigned int attr)
3787 int nbytes; /* Size of next data for this attribute */
3788 unsigned short form; /* Form of the attribute */
3790 form = FORM_FROM_ATTR (attr);
3793 case FORM_STRING: /* A variable length field is next */
3796 case FORM_DATA2: /* Next 2 byte field is the data itself */
3797 case FORM_BLOCK2: /* Next 2 byte field is a block length */
3800 case FORM_DATA4: /* Next 4 byte field is the data itself */
3801 case FORM_BLOCK4: /* Next 4 byte field is a block length */
3802 case FORM_REF: /* Next 4 byte field is a DIE offset */
3805 case FORM_DATA8: /* Next 8 byte field is the data itself */
3808 case FORM_ADDR: /* Next field size is target sizeof(void *) */
3809 nbytes = TARGET_FT_POINTER_SIZE (objfile);
3812 unknown_attribute_form_complaint (DIE_ID, DIE_NAME, form);