1 /* DWARF debugging format support for GDB.
3 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
6 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
7 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 If you are looking for DWARF-2 support, you are in the wrong file.
27 Go look in dwarf2read.c. This file is for the original DWARF.
29 DWARF (also known as DWARF-1) is headed for obsoletion.
31 In gcc 3.2.1, these targets prefer dwarf-1:
33 i[34567]86-sequent-ptx4* # TD-R2
34 i[34567]86-sequent-sysv4* # TD-R2
35 i[34567]86-dg-dgux* # obsolete in gcc 3.2.1, to be removed in 3.3
37 mips-sni-sysv4 # TD-R2
38 sparc-hal-solaris2* # TD-R2
40 Configurations marked with "# TD-R2" are on Zach Weinberg's list
41 of "Target Deprecation, Round 2". This is a candidate list of
42 targets to be deprecated in gcc 3.3 and removed in gcc 3.4.
44 http://gcc.gnu.org/ml/gcc/2002-12/msg00702.html
46 gcc 2.95.3 had many configurations which prefer dwarf-1.
47 We may have to support dwarf-1 as long as we support gcc 2.95.3.
48 This could use more analysis.
50 DG/UX (Data General Unix) used dwarf-1 for its native format.
51 DG/UX uses gcc for its system C compiler, but they have their
52 own linker and their own debuggers.
54 Takis Psarogiannakopoulos has a complete gnu toolchain for DG/UX
55 with gcc 2.95.3, gdb 5.1, and debug formats of dwarf-2 and stabs.
56 For more info, see PR gdb/979 and PR gdb/1013; also:
58 http://sources.redhat.com/ml/gdb/2003-02/msg00074.html
60 There may be non-gcc compilers that still emit dwarf-1.
62 -- chastain 2003-02-04
67 FIXME: Do we need to generate dependencies in partial symtabs?
68 (Perhaps we don't need to).
70 FIXME: Resolve minor differences between what information we put in the
71 partial symbol table and what dbxread puts in. For example, we don't yet
72 put enum constants there. And dbxread seems to invent a lot of typedefs
73 we never see. Use the new printpsym command to see the partial symbol table
76 FIXME: Figure out a better way to tell gdb about the name of the function
77 contain the user's entry point (I.E. main())
79 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
80 other things to work on, if you get bored. :-)
89 #include "elf/dwarf.h"
92 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
94 #include "complaints.h"
97 #include "gdb_string.h"
99 /* Some macros to provide DIE info for complaints. */
101 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
102 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
104 /* Complaints that can be issued during DWARF debug info reading. */
107 bad_die_ref_complaint (int arg1
, const char *arg2
, int arg3
)
109 complaint (&symfile_complaints
,
110 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit",
115 unknown_attribute_form_complaint (int arg1
, const char *arg2
, int arg3
)
117 complaint (&symfile_complaints
,
118 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", arg1
, arg2
,
123 dup_user_type_definition_complaint (int arg1
, const char *arg2
)
125 complaint (&symfile_complaints
,
126 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition",
131 bad_array_element_type_complaint (int arg1
, const char *arg2
, int arg3
)
133 complaint (&symfile_complaints
,
134 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", arg1
,
138 typedef unsigned int DIE_REF
; /* Reference to a DIE */
141 #define GCC_PRODUCER "GNU C "
144 #ifndef GPLUS_PRODUCER
145 #define GPLUS_PRODUCER "GNU C++ "
149 #define LCC_PRODUCER "NCR C/C++"
152 /* Flags to target_to_host() that tell whether or not the data object is
153 expected to be signed. Used, for example, when fetching a signed
154 integer in the target environment which is used as a signed integer
155 in the host environment, and the two environments have different sized
156 ints. In this case, *somebody* has to sign extend the smaller sized
159 #define GET_UNSIGNED 0 /* No sign extension required */
160 #define GET_SIGNED 1 /* Sign extension required */
162 /* Defines for things which are specified in the document "DWARF Debugging
163 Information Format" published by UNIX International, Programming Languages
164 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
166 #define SIZEOF_DIE_LENGTH 4
167 #define SIZEOF_DIE_TAG 2
168 #define SIZEOF_ATTRIBUTE 2
169 #define SIZEOF_FORMAT_SPECIFIER 1
170 #define SIZEOF_FMT_FT 2
171 #define SIZEOF_LINETBL_LENGTH 4
172 #define SIZEOF_LINETBL_LINENO 4
173 #define SIZEOF_LINETBL_STMT 2
174 #define SIZEOF_LINETBL_DELTA 4
175 #define SIZEOF_LOC_ATOM_CODE 1
177 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
179 /* Macros that return the sizes of various types of data in the target
182 FIXME: Currently these are just compile time constants (as they are in
183 other parts of gdb as well). They need to be able to get the right size
184 either from the bfd or possibly from the DWARF info. It would be nice if
185 the DWARF producer inserted DIES that describe the fundamental types in
186 the target environment into the DWARF info, similar to the way dbx stabs
187 producers produce information about their fundamental types. */
189 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
190 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
192 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
193 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
194 However, the Issue 2 DWARF specification from AT&T defines it as
195 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
196 For backwards compatibility with the AT&T compiler produced executables
197 we define AT_short_element_list for this variant. */
199 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
201 /* The DWARF debugging information consists of two major pieces,
202 one is a block of DWARF Information Entries (DIE's) and the other
203 is a line number table. The "struct dieinfo" structure contains
204 the information for a single DIE, the one currently being processed.
206 In order to make it easier to randomly access the attribute fields
207 of the current DIE, which are specifically unordered within the DIE,
208 each DIE is scanned and an instance of the "struct dieinfo"
209 structure is initialized.
211 Initialization is done in two levels. The first, done by basicdieinfo(),
212 just initializes those fields that are vital to deciding whether or not
213 to use this DIE, how to skip past it, etc. The second, done by the
214 function completedieinfo(), fills in the rest of the information.
216 Attributes which have block forms are not interpreted at the time
217 the DIE is scanned, instead we just save pointers to the start
218 of their value fields.
220 Some fields have a flag <name>_p that is set when the value of the
221 field is valid (I.E. we found a matching attribute in the DIE). Since
222 we may want to test for the presence of some attributes in the DIE,
223 such as AT_low_pc, without restricting the values of the field,
224 we need someway to note that we found such an attribute.
232 char *die
; /* Pointer to the raw DIE data */
233 unsigned long die_length
; /* Length of the raw DIE data */
234 DIE_REF die_ref
; /* Offset of this DIE */
235 unsigned short die_tag
; /* Tag for this DIE */
236 unsigned long at_padding
;
237 unsigned long at_sibling
;
240 unsigned short at_fund_type
;
241 BLOCK
*at_mod_fund_type
;
242 unsigned long at_user_def_type
;
243 BLOCK
*at_mod_u_d_type
;
244 unsigned short at_ordering
;
245 BLOCK
*at_subscr_data
;
246 unsigned long at_byte_size
;
247 unsigned short at_bit_offset
;
248 unsigned long at_bit_size
;
249 BLOCK
*at_element_list
;
250 unsigned long at_stmt_list
;
252 CORE_ADDR at_high_pc
;
253 unsigned long at_language
;
254 unsigned long at_member
;
255 unsigned long at_discr
;
256 BLOCK
*at_discr_value
;
257 BLOCK
*at_string_length
;
260 unsigned long at_start_scope
;
261 unsigned long at_stride_size
;
262 unsigned long at_src_info
;
264 unsigned int has_at_low_pc
:1;
265 unsigned int has_at_stmt_list
:1;
266 unsigned int has_at_byte_size
:1;
267 unsigned int short_element_list
:1;
269 /* Kludge to identify register variables */
273 /* Kludge to identify optimized out variables */
275 unsigned int optimized_out
;
277 /* Kludge to identify basereg references.
278 Nonzero if we have an offset relative to a basereg. */
282 /* Kludge to identify which base register is it relative to. */
284 unsigned int basereg
;
287 static int diecount
; /* Approximate count of dies for compilation unit */
288 static struct dieinfo
*curdie
; /* For warnings and such */
290 static char *dbbase
; /* Base pointer to dwarf info */
291 static int dbsize
; /* Size of dwarf info in bytes */
292 static int dbroff
; /* Relative offset from start of .debug section */
293 static char *lnbase
; /* Base pointer to line section */
295 /* This value is added to each symbol value. FIXME: Generalize to
296 the section_offsets structure used by dbxread (once this is done,
297 pass the appropriate section number to end_symtab). */
298 static CORE_ADDR baseaddr
; /* Add to each symbol value */
300 /* The section offsets used in the current psymtab or symtab. FIXME,
301 only used to pass one value (baseaddr) at the moment. */
302 static struct section_offsets
*base_section_offsets
;
304 /* We put a pointer to this structure in the read_symtab_private field
309 /* Always the absolute file offset to the start of the ".debug"
310 section for the file containing the DIE's being accessed. */
312 /* Relative offset from the start of the ".debug" section to the
313 first DIE to be accessed. When building the partial symbol
314 table, this value will be zero since we are accessing the
315 entire ".debug" section. When expanding a partial symbol
316 table entry, this value will be the offset to the first
317 DIE for the compilation unit containing the symbol that
318 triggers the expansion. */
320 /* The size of the chunk of DIE's being examined, in bytes. */
322 /* The absolute file offset to the line table fragment. Ignored
323 when building partial symbol tables, but used when expanding
324 them, and contains the absolute file offset to the fragment
325 of the ".line" section containing the line numbers for the
326 current compilation unit. */
330 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
331 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
332 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
333 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
335 /* The generic symbol table building routines have separate lists for
336 file scope symbols and all all other scopes (local scopes). So
337 we need to select the right one to pass to add_symbol_to_list().
338 We do it by keeping a pointer to the correct list in list_in_scope.
340 FIXME: The original dwarf code just treated the file scope as the first
341 local scope, and all other local scopes as nested local scopes, and worked
342 fine. Check to see if we really need to distinguish these in buildsym.c */
344 struct pending
**list_in_scope
= &file_symbols
;
346 /* DIES which have user defined types or modified user defined types refer to
347 other DIES for the type information. Thus we need to associate the offset
348 of a DIE for a user defined type with a pointer to the type information.
350 Originally this was done using a simple but expensive algorithm, with an
351 array of unsorted structures, each containing an offset/type-pointer pair.
352 This array was scanned linearly each time a lookup was done. The result
353 was that gdb was spending over half it's startup time munging through this
354 array of pointers looking for a structure that had the right offset member.
356 The second attempt used the same array of structures, but the array was
357 sorted using qsort each time a new offset/type was recorded, and a binary
358 search was used to find the type pointer for a given DIE offset. This was
359 even slower, due to the overhead of sorting the array each time a new
360 offset/type pair was entered.
362 The third attempt uses a fixed size array of type pointers, indexed by a
363 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
364 we can divide any DIE offset by 4 to obtain a unique index into this fixed
365 size array. Since each element is a 4 byte pointer, it takes exactly as
366 much memory to hold this array as to hold the DWARF info for a given
367 compilation unit. But it gets freed as soon as we are done with it.
368 This has worked well in practice, as a reasonable tradeoff between memory
369 consumption and speed, without having to resort to much more complicated
372 static struct type
**utypes
; /* Pointer to array of user type pointers */
373 static int numutypes
; /* Max number of user type pointers */
375 /* Maintain an array of referenced fundamental types for the current
376 compilation unit being read. For DWARF version 1, we have to construct
377 the fundamental types on the fly, since no information about the
378 fundamental types is supplied. Each such fundamental type is created by
379 calling a language dependent routine to create the type, and then a
380 pointer to that type is then placed in the array at the index specified
381 by it's FT_<TYPENAME> value. The array has a fixed size set by the
382 FT_NUM_MEMBERS compile time constant, which is the number of predefined
383 fundamental types gdb knows how to construct. */
385 static struct type
*ftypes
[FT_NUM_MEMBERS
]; /* Fundamental types */
387 /* Record the language for the compilation unit which is currently being
388 processed. We know it once we have seen the TAG_compile_unit DIE,
389 and we need it while processing the DIE's for that compilation unit.
390 It is eventually saved in the symtab structure, but we don't finalize
391 the symtab struct until we have processed all the DIE's for the
392 compilation unit. We also need to get and save a pointer to the
393 language struct for this language, so we can call the language
394 dependent routines for doing things such as creating fundamental
397 static enum language cu_language
;
398 static const struct language_defn
*cu_language_defn
;
400 /* Forward declarations of static functions so we don't have to worry
401 about ordering within this file. */
403 static void free_utypes (void *);
405 static int attribute_size (unsigned int);
407 static CORE_ADDR
target_to_host (char *, int, int, struct objfile
*);
409 static void add_enum_psymbol (struct dieinfo
*, struct objfile
*);
411 static void handle_producer (char *);
413 static void read_file_scope (struct dieinfo
*, char *, char *,
416 static void read_func_scope (struct dieinfo
*, char *, char *,
419 static void read_lexical_block_scope (struct dieinfo
*, char *, char *,
422 static void scan_partial_symbols (char *, char *, struct objfile
*);
424 static void scan_compilation_units (char *, char *, file_ptr
, file_ptr
,
427 static void add_partial_symbol (struct dieinfo
*, struct objfile
*);
429 static void basicdieinfo (struct dieinfo
*, char *, struct objfile
*);
431 static void completedieinfo (struct dieinfo
*, struct objfile
*);
433 static void dwarf_psymtab_to_symtab (struct partial_symtab
*);
435 static void psymtab_to_symtab_1 (struct partial_symtab
*);
437 static void read_ofile_symtab (struct partial_symtab
*);
439 static void process_dies (char *, char *, struct objfile
*);
441 static void read_structure_scope (struct dieinfo
*, char *, char *,
444 static struct type
*decode_array_element_type (char *);
446 static struct type
*decode_subscript_data_item (char *, char *);
448 static void dwarf_read_array_type (struct dieinfo
*);
450 static void read_tag_pointer_type (struct dieinfo
*dip
);
452 static void read_tag_string_type (struct dieinfo
*dip
);
454 static void read_subroutine_type (struct dieinfo
*, char *, char *);
456 static void read_enumeration (struct dieinfo
*, char *, char *,
459 static struct type
*struct_type (struct dieinfo
*, char *, char *,
462 static struct type
*enum_type (struct dieinfo
*, struct objfile
*);
464 static void decode_line_numbers (char *);
466 static struct type
*decode_die_type (struct dieinfo
*);
468 static struct type
*decode_mod_fund_type (char *);
470 static struct type
*decode_mod_u_d_type (char *);
472 static struct type
*decode_modified_type (char *, unsigned int, int);
474 static struct type
*decode_fund_type (unsigned int);
476 static char *create_name (char *, struct obstack
*);
478 static struct type
*lookup_utype (DIE_REF
);
480 static struct type
*alloc_utype (DIE_REF
, struct type
*);
482 static struct symbol
*new_symbol (struct dieinfo
*, struct objfile
*);
484 static void synthesize_typedef (struct dieinfo
*, struct objfile
*,
487 static int locval (struct dieinfo
*);
489 static void set_cu_language (struct dieinfo
*);
491 static struct type
*dwarf_fundamental_type (struct objfile
*, int);
498 dwarf_fundamental_type -- lookup or create a fundamental type
503 dwarf_fundamental_type (struct objfile *objfile, int typeid)
507 DWARF version 1 doesn't supply any fundamental type information,
508 so gdb has to construct such types. It has a fixed number of
509 fundamental types that it knows how to construct, which is the
510 union of all types that it knows how to construct for all languages
511 that it knows about. These are enumerated in gdbtypes.h.
513 As an example, assume we find a DIE that references a DWARF
514 fundamental type of FT_integer. We first look in the ftypes
515 array to see if we already have such a type, indexed by the
516 gdb internal value of FT_INTEGER. If so, we simply return a
517 pointer to that type. If not, then we ask an appropriate
518 language dependent routine to create a type FT_INTEGER, using
519 defaults reasonable for the current target machine, and install
520 that type in ftypes for future reference.
524 Pointer to a fundamental type.
529 dwarf_fundamental_type (struct objfile
*objfile
, int typeid)
531 if (typeid < 0 || typeid >= FT_NUM_MEMBERS
)
533 error ("internal error - invalid fundamental type id %d", typeid);
536 /* Look for this particular type in the fundamental type vector. If one is
537 not found, create and install one appropriate for the current language
538 and the current target machine. */
540 if (ftypes
[typeid] == NULL
)
542 ftypes
[typeid] = cu_language_defn
->la_fund_type (objfile
, typeid);
545 return (ftypes
[typeid]);
552 set_cu_language -- set local copy of language for compilation unit
557 set_cu_language (struct dieinfo *dip)
561 Decode the language attribute for a compilation unit DIE and
562 remember what the language was. We use this at various times
563 when processing DIE's for a given compilation unit.
572 set_cu_language (struct dieinfo
*dip
)
574 switch (dip
->at_language
)
578 cu_language
= language_c
;
580 case LANG_C_PLUS_PLUS
:
581 cu_language
= language_cplus
;
584 cu_language
= language_m2
;
588 cu_language
= language_fortran
;
594 /* We don't know anything special about these yet. */
595 cu_language
= language_unknown
;
598 /* If no at_language, try to deduce one from the filename */
599 cu_language
= deduce_language_from_filename (dip
->at_name
);
602 cu_language_defn
= language_def (cu_language
);
609 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
613 void dwarf_build_psymtabs (struct objfile *objfile,
614 int mainline, file_ptr dbfoff, unsigned int dbfsize,
615 file_ptr lnoffset, unsigned int lnsize)
619 This function is called upon to build partial symtabs from files
620 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
622 It is passed a bfd* containing the DIES
623 and line number information, the corresponding filename for that
624 file, a base address for relocating the symbols, a flag indicating
625 whether or not this debugging information is from a "main symbol
626 table" rather than a shared library or dynamically linked file,
627 and file offset/size pairs for the DIE information and line number
637 dwarf_build_psymtabs (struct objfile
*objfile
, int mainline
, file_ptr dbfoff
,
638 unsigned int dbfsize
, file_ptr lnoffset
,
641 bfd
*abfd
= objfile
->obfd
;
642 struct cleanup
*back_to
;
644 current_objfile
= objfile
;
646 dbbase
= xmalloc (dbsize
);
648 if ((bfd_seek (abfd
, dbfoff
, SEEK_SET
) != 0) ||
649 (bfd_bread (dbbase
, dbsize
, abfd
) != dbsize
))
652 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
654 back_to
= make_cleanup (xfree
, dbbase
);
656 /* If we are reinitializing, or if we have never loaded syms yet, init.
657 Since we have no idea how many DIES we are looking at, we just guess
658 some arbitrary value. */
661 || (objfile
->global_psymbols
.size
== 0
662 && objfile
->static_psymbols
.size
== 0))
664 init_psymbol_list (objfile
, 1024);
667 /* Save the relocation factor where everybody can see it. */
669 base_section_offsets
= objfile
->section_offsets
;
670 baseaddr
= ANOFFSET (objfile
->section_offsets
, 0);
672 /* Follow the compilation unit sibling chain, building a partial symbol
673 table entry for each one. Save enough information about each compilation
674 unit to locate the full DWARF information later. */
676 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
678 do_cleanups (back_to
);
679 current_objfile
= NULL
;
686 read_lexical_block_scope -- process all dies in a lexical block
690 static void read_lexical_block_scope (struct dieinfo *dip,
691 char *thisdie, char *enddie)
695 Process all the DIES contained within a lexical block scope.
696 Start a new scope, process the dies, and then close the scope.
701 read_lexical_block_scope (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
702 struct objfile
*objfile
)
704 register struct context_stack
*new;
706 push_context (0, dip
->at_low_pc
);
707 process_dies (thisdie
+ dip
->die_length
, enddie
, objfile
);
708 new = pop_context ();
709 if (local_symbols
!= NULL
)
711 finish_block (0, &local_symbols
, new->old_blocks
, new->start_addr
,
712 dip
->at_high_pc
, objfile
);
714 local_symbols
= new->locals
;
721 lookup_utype -- look up a user defined type from die reference
725 static type *lookup_utype (DIE_REF die_ref)
729 Given a DIE reference, lookup the user defined type associated with
730 that DIE, if it has been registered already. If not registered, then
731 return NULL. Alloc_utype() can be called to register an empty
732 type for this reference, which will be filled in later when the
733 actual referenced DIE is processed.
737 lookup_utype (DIE_REF die_ref
)
739 struct type
*type
= NULL
;
742 utypeidx
= (die_ref
- dbroff
) / 4;
743 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
745 bad_die_ref_complaint (DIE_ID
, DIE_NAME
, die_ref
);
749 type
= *(utypes
+ utypeidx
);
759 alloc_utype -- add a user defined type for die reference
763 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
767 Given a die reference DIE_REF, and a possible pointer to a user
768 defined type UTYPEP, register that this reference has a user
769 defined type and either use the specified type in UTYPEP or
770 make a new empty type that will be filled in later.
772 We should only be called after calling lookup_utype() to verify that
773 there is not currently a type registered for DIE_REF.
777 alloc_utype (DIE_REF die_ref
, struct type
*utypep
)
782 utypeidx
= (die_ref
- dbroff
) / 4;
783 typep
= utypes
+ utypeidx
;
784 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
786 utypep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
787 bad_die_ref_complaint (DIE_ID
, DIE_NAME
, die_ref
);
789 else if (*typep
!= NULL
)
792 complaint (&symfile_complaints
,
793 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation",
800 utypep
= alloc_type (current_objfile
);
811 free_utypes -- free the utypes array and reset pointer & count
815 static void free_utypes (void *dummy)
819 Called via do_cleanups to free the utypes array, reset the pointer to NULL,
820 and set numutypes back to zero. This ensures that the utypes does not get
821 referenced after being freed.
825 free_utypes (void *dummy
)
837 decode_die_type -- return a type for a specified die
841 static struct type *decode_die_type (struct dieinfo *dip)
845 Given a pointer to a die information structure DIP, decode the
846 type of the die and return a pointer to the decoded type. All
847 dies without specific types default to type int.
851 decode_die_type (struct dieinfo
*dip
)
853 struct type
*type
= NULL
;
855 if (dip
->at_fund_type
!= 0)
857 type
= decode_fund_type (dip
->at_fund_type
);
859 else if (dip
->at_mod_fund_type
!= NULL
)
861 type
= decode_mod_fund_type (dip
->at_mod_fund_type
);
863 else if (dip
->at_user_def_type
)
865 if ((type
= lookup_utype (dip
->at_user_def_type
)) == NULL
)
867 type
= alloc_utype (dip
->at_user_def_type
, NULL
);
870 else if (dip
->at_mod_u_d_type
)
872 type
= decode_mod_u_d_type (dip
->at_mod_u_d_type
);
876 type
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
885 struct_type -- compute and return the type for a struct or union
889 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
890 char *enddie, struct objfile *objfile)
894 Given pointer to a die information structure for a die which
895 defines a union or structure (and MUST define one or the other),
896 and pointers to the raw die data that define the range of dies which
897 define the members, compute and return the user defined type for the
902 struct_type (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
903 struct objfile
*objfile
)
908 struct nextfield
*next
;
911 struct nextfield
*list
= NULL
;
912 struct nextfield
*new;
919 if ((type
= lookup_utype (dip
->die_ref
)) == NULL
)
921 /* No forward references created an empty type, so install one now */
922 type
= alloc_utype (dip
->die_ref
, NULL
);
924 INIT_CPLUS_SPECIFIC (type
);
925 switch (dip
->die_tag
)
928 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
930 case TAG_structure_type
:
931 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
934 TYPE_CODE (type
) = TYPE_CODE_UNION
;
937 /* Should never happen */
938 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
939 complaint (&symfile_complaints
,
940 "DIE @ 0x%x \"%s\", missing class, structure, or union tag",
944 /* Some compilers try to be helpful by inventing "fake" names for
945 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
946 Thanks, but no thanks... */
947 if (dip
->at_name
!= NULL
948 && *dip
->at_name
!= '~'
949 && *dip
->at_name
!= '.')
951 TYPE_TAG_NAME (type
) = obconcat (&objfile
->type_obstack
,
952 "", "", dip
->at_name
);
954 /* Use whatever size is known. Zero is a valid size. We might however
955 wish to check has_at_byte_size to make sure that some byte size was
956 given explicitly, but DWARF doesn't specify that explicit sizes of
957 zero have to present, so complaining about missing sizes should
958 probably not be the default. */
959 TYPE_LENGTH (type
) = dip
->at_byte_size
;
960 thisdie
+= dip
->die_length
;
961 while (thisdie
< enddie
)
963 basicdieinfo (&mbr
, thisdie
, objfile
);
964 completedieinfo (&mbr
, objfile
);
965 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
969 else if (mbr
.at_sibling
!= 0)
971 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
975 nextdie
= thisdie
+ mbr
.die_length
;
980 /* Get space to record the next field's data. */
981 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
986 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
987 &objfile
->type_obstack
);
988 FIELD_TYPE (list
->field
) = decode_die_type (&mbr
);
989 FIELD_BITPOS (list
->field
) = 8 * locval (&mbr
);
990 FIELD_STATIC_KIND (list
->field
) = 0;
991 /* Handle bit fields. */
992 FIELD_BITSIZE (list
->field
) = mbr
.at_bit_size
;
995 /* For big endian bits, the at_bit_offset gives the
996 additional bit offset from the MSB of the containing
997 anonymous object to the MSB of the field. We don't
998 have to do anything special since we don't need to
999 know the size of the anonymous object. */
1000 FIELD_BITPOS (list
->field
) += mbr
.at_bit_offset
;
1004 /* For little endian bits, we need to have a non-zero
1005 at_bit_size, so that we know we are in fact dealing
1006 with a bitfield. Compute the bit offset to the MSB
1007 of the anonymous object, subtract off the number of
1008 bits from the MSB of the field to the MSB of the
1009 object, and then subtract off the number of bits of
1010 the field itself. The result is the bit offset of
1011 the LSB of the field. */
1012 if (mbr
.at_bit_size
> 0)
1014 if (mbr
.has_at_byte_size
)
1016 /* The size of the anonymous object containing
1017 the bit field is explicit, so use the
1018 indicated size (in bytes). */
1019 anonymous_size
= mbr
.at_byte_size
;
1023 /* The size of the anonymous object containing
1024 the bit field matches the size of an object
1025 of the bit field's type. DWARF allows
1026 at_byte_size to be left out in such cases, as
1027 a debug information size optimization. */
1028 anonymous_size
= TYPE_LENGTH (list
->field
.type
);
1030 FIELD_BITPOS (list
->field
) +=
1031 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
1037 process_dies (thisdie
, nextdie
, objfile
);
1042 /* Now create the vector of fields, and record how big it is. We may
1043 not even have any fields, if this DIE was generated due to a reference
1044 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1045 set, which clues gdb in to the fact that it needs to search elsewhere
1046 for the full structure definition. */
1049 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1053 TYPE_NFIELDS (type
) = nfields
;
1054 TYPE_FIELDS (type
) = (struct field
*)
1055 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1056 /* Copy the saved-up fields into the field vector. */
1057 for (n
= nfields
; list
; list
= list
->next
)
1059 TYPE_FIELD (type
, --n
) = list
->field
;
1069 read_structure_scope -- process all dies within struct or union
1073 static void read_structure_scope (struct dieinfo *dip,
1074 char *thisdie, char *enddie, struct objfile *objfile)
1078 Called when we find the DIE that starts a structure or union
1079 scope (definition) to process all dies that define the members
1080 of the structure or union. DIP is a pointer to the die info
1081 struct for the DIE that names the structure or union.
1085 Note that we need to call struct_type regardless of whether or not
1086 the DIE has an at_name attribute, since it might be an anonymous
1087 structure or union. This gets the type entered into our set of
1090 However, if the structure is incomplete (an opaque struct/union)
1091 then suppress creating a symbol table entry for it since gdb only
1092 wants to find the one with the complete definition. Note that if
1093 it is complete, we just call new_symbol, which does it's own
1094 checking about whether the struct/union is anonymous or not (and
1095 suppresses creating a symbol table entry itself).
1100 read_structure_scope (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
1101 struct objfile
*objfile
)
1106 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1107 if (!TYPE_STUB (type
))
1109 sym
= new_symbol (dip
, objfile
);
1112 SYMBOL_TYPE (sym
) = type
;
1113 if (cu_language
== language_cplus
)
1115 synthesize_typedef (dip
, objfile
, type
);
1125 decode_array_element_type -- decode type of the array elements
1129 static struct type *decode_array_element_type (char *scan, char *end)
1133 As the last step in decoding the array subscript information for an
1134 array DIE, we need to decode the type of the array elements. We are
1135 passed a pointer to this last part of the subscript information and
1136 must return the appropriate type. If the type attribute is not
1137 recognized, just warn about the problem and return type int.
1140 static struct type
*
1141 decode_array_element_type (char *scan
)
1145 unsigned short attribute
;
1146 unsigned short fundtype
;
1149 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1151 scan
+= SIZEOF_ATTRIBUTE
;
1152 if ((nbytes
= attribute_size (attribute
)) == -1)
1154 bad_array_element_type_complaint (DIE_ID
, DIE_NAME
, attribute
);
1155 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1162 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1164 typep
= decode_fund_type (fundtype
);
1166 case AT_mod_fund_type
:
1167 typep
= decode_mod_fund_type (scan
);
1169 case AT_user_def_type
:
1170 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1172 if ((typep
= lookup_utype (die_ref
)) == NULL
)
1174 typep
= alloc_utype (die_ref
, NULL
);
1177 case AT_mod_u_d_type
:
1178 typep
= decode_mod_u_d_type (scan
);
1181 bad_array_element_type_complaint (DIE_ID
, DIE_NAME
, attribute
);
1182 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1193 decode_subscript_data_item -- decode array subscript item
1197 static struct type *
1198 decode_subscript_data_item (char *scan, char *end)
1202 The array subscripts and the data type of the elements of an
1203 array are described by a list of data items, stored as a block
1204 of contiguous bytes. There is a data item describing each array
1205 dimension, and a final data item describing the element type.
1206 The data items are ordered the same as their appearance in the
1207 source (I.E. leftmost dimension first, next to leftmost second,
1210 The data items describing each array dimension consist of four
1211 parts: (1) a format specifier, (2) type type of the subscript
1212 index, (3) a description of the low bound of the array dimension,
1213 and (4) a description of the high bound of the array dimension.
1215 The last data item is the description of the type of each of
1218 We are passed a pointer to the start of the block of bytes
1219 containing the remaining data items, and a pointer to the first
1220 byte past the data. This function recursively decodes the
1221 remaining data items and returns a type.
1223 If we somehow fail to decode some data, we complain about it
1224 and return a type "array of int".
1227 FIXME: This code only implements the forms currently used
1228 by the AT&T and GNU C compilers.
1230 The end pointer is supplied for error checking, maybe we should
1234 static struct type
*
1235 decode_subscript_data_item (char *scan
, char *end
)
1237 struct type
*typep
= NULL
; /* Array type we are building */
1238 struct type
*nexttype
; /* Type of each element (may be array) */
1239 struct type
*indextype
; /* Type of this index */
1240 struct type
*rangetype
;
1241 unsigned int format
;
1242 unsigned short fundtype
;
1243 unsigned long lowbound
;
1244 unsigned long highbound
;
1247 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1249 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1253 typep
= decode_array_element_type (scan
);
1256 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1258 indextype
= decode_fund_type (fundtype
);
1259 scan
+= SIZEOF_FMT_FT
;
1260 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1261 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1263 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1265 nexttype
= decode_subscript_data_item (scan
, end
);
1266 if (nexttype
== NULL
)
1268 /* Munged subscript data or other problem, fake it. */
1269 complaint (&symfile_complaints
,
1270 "DIE @ 0x%x \"%s\", can't decode subscript data items",
1272 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1274 rangetype
= create_range_type ((struct type
*) NULL
, indextype
,
1275 lowbound
, highbound
);
1276 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1285 complaint (&symfile_complaints
,
1286 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet",
1287 DIE_ID
, DIE_NAME
, format
);
1288 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1289 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1290 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1293 complaint (&symfile_complaints
,
1294 "DIE @ 0x%x \"%s\", unknown array subscript format %x", DIE_ID
,
1296 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1297 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1298 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1308 dwarf_read_array_type -- read TAG_array_type DIE
1312 static void dwarf_read_array_type (struct dieinfo *dip)
1316 Extract all information from a TAG_array_type DIE and add to
1317 the user defined type vector.
1321 dwarf_read_array_type (struct dieinfo
*dip
)
1327 unsigned short blocksz
;
1330 if (dip
->at_ordering
!= ORD_row_major
)
1332 /* FIXME: Can gdb even handle column major arrays? */
1333 complaint (&symfile_complaints
,
1334 "DIE @ 0x%x \"%s\", array not row major; not handled correctly",
1337 if ((sub
= dip
->at_subscr_data
) != NULL
)
1339 nbytes
= attribute_size (AT_subscr_data
);
1340 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1341 subend
= sub
+ nbytes
+ blocksz
;
1343 type
= decode_subscript_data_item (sub
, subend
);
1344 if ((utype
= lookup_utype (dip
->die_ref
)) == NULL
)
1346 /* Install user defined type that has not been referenced yet. */
1347 alloc_utype (dip
->die_ref
, type
);
1349 else if (TYPE_CODE (utype
) == TYPE_CODE_UNDEF
)
1351 /* Ick! A forward ref has already generated a blank type in our
1352 slot, and this type probably already has things pointing to it
1353 (which is what caused it to be created in the first place).
1354 If it's just a place holder we can plop our fully defined type
1355 on top of it. We can't recover the space allocated for our
1356 new type since it might be on an obstack, but we could reuse
1357 it if we kept a list of them, but it might not be worth it
1363 /* Double ick! Not only is a type already in our slot, but
1364 someone has decorated it. Complain and leave it alone. */
1365 dup_user_type_definition_complaint (DIE_ID
, DIE_NAME
);
1374 read_tag_pointer_type -- read TAG_pointer_type DIE
1378 static void read_tag_pointer_type (struct dieinfo *dip)
1382 Extract all information from a TAG_pointer_type DIE and add to
1383 the user defined type vector.
1387 read_tag_pointer_type (struct dieinfo
*dip
)
1392 type
= decode_die_type (dip
);
1393 if ((utype
= lookup_utype (dip
->die_ref
)) == NULL
)
1395 utype
= lookup_pointer_type (type
);
1396 alloc_utype (dip
->die_ref
, utype
);
1400 TYPE_TARGET_TYPE (utype
) = type
;
1401 TYPE_POINTER_TYPE (type
) = utype
;
1403 /* We assume the machine has only one representation for pointers! */
1404 /* FIXME: Possably a poor assumption */
1405 TYPE_LENGTH (utype
) = TARGET_PTR_BIT
/ TARGET_CHAR_BIT
;
1406 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1414 read_tag_string_type -- read TAG_string_type DIE
1418 static void read_tag_string_type (struct dieinfo *dip)
1422 Extract all information from a TAG_string_type DIE and add to
1423 the user defined type vector. It isn't really a user defined
1424 type, but it behaves like one, with other DIE's using an
1425 AT_user_def_type attribute to reference it.
1429 read_tag_string_type (struct dieinfo
*dip
)
1432 struct type
*indextype
;
1433 struct type
*rangetype
;
1434 unsigned long lowbound
= 0;
1435 unsigned long highbound
;
1437 if (dip
->has_at_byte_size
)
1439 /* A fixed bounds string */
1440 highbound
= dip
->at_byte_size
- 1;
1444 /* A varying length string. Stub for now. (FIXME) */
1447 indextype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1448 rangetype
= create_range_type ((struct type
*) NULL
, indextype
, lowbound
,
1451 utype
= lookup_utype (dip
->die_ref
);
1454 /* No type defined, go ahead and create a blank one to use. */
1455 utype
= alloc_utype (dip
->die_ref
, (struct type
*) NULL
);
1459 /* Already a type in our slot due to a forward reference. Make sure it
1460 is a blank one. If not, complain and leave it alone. */
1461 if (TYPE_CODE (utype
) != TYPE_CODE_UNDEF
)
1463 dup_user_type_definition_complaint (DIE_ID
, DIE_NAME
);
1468 /* Create the string type using the blank type we either found or created. */
1469 utype
= create_string_type (utype
, rangetype
);
1476 read_subroutine_type -- process TAG_subroutine_type dies
1480 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1485 Handle DIES due to C code like:
1488 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1494 The parameter DIES are currently ignored. See if gdb has a way to
1495 include this info in it's type system, and decode them if so. Is
1496 this what the type structure's "arg_types" field is for? (FIXME)
1500 read_subroutine_type (struct dieinfo
*dip
, char *thisdie
, char *enddie
)
1502 struct type
*type
; /* Type that this function returns */
1503 struct type
*ftype
; /* Function that returns above type */
1505 /* Decode the type that this subroutine returns */
1507 type
= decode_die_type (dip
);
1509 /* Check to see if we already have a partially constructed user
1510 defined type for this DIE, from a forward reference. */
1512 if ((ftype
= lookup_utype (dip
->die_ref
)) == NULL
)
1514 /* This is the first reference to one of these types. Make
1515 a new one and place it in the user defined types. */
1516 ftype
= lookup_function_type (type
);
1517 alloc_utype (dip
->die_ref
, ftype
);
1519 else if (TYPE_CODE (ftype
) == TYPE_CODE_UNDEF
)
1521 /* We have an existing partially constructed type, so bash it
1522 into the correct type. */
1523 TYPE_TARGET_TYPE (ftype
) = type
;
1524 TYPE_LENGTH (ftype
) = 1;
1525 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1529 dup_user_type_definition_complaint (DIE_ID
, DIE_NAME
);
1537 read_enumeration -- process dies which define an enumeration
1541 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1542 char *enddie, struct objfile *objfile)
1546 Given a pointer to a die which begins an enumeration, process all
1547 the dies that define the members of the enumeration.
1551 Note that we need to call enum_type regardless of whether or not we
1552 have a symbol, since we might have an enum without a tag name (thus
1553 no symbol for the tagname).
1557 read_enumeration (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
1558 struct objfile
*objfile
)
1563 type
= enum_type (dip
, objfile
);
1564 sym
= new_symbol (dip
, objfile
);
1567 SYMBOL_TYPE (sym
) = type
;
1568 if (cu_language
== language_cplus
)
1570 synthesize_typedef (dip
, objfile
, type
);
1579 enum_type -- decode and return a type for an enumeration
1583 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1587 Given a pointer to a die information structure for the die which
1588 starts an enumeration, process all the dies that define the members
1589 of the enumeration and return a type pointer for the enumeration.
1591 At the same time, for each member of the enumeration, create a
1592 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1593 and give it the type of the enumeration itself.
1597 Note that the DWARF specification explicitly mandates that enum
1598 constants occur in reverse order from the source program order,
1599 for "consistency" and because this ordering is easier for many
1600 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1601 Entries). Because gdb wants to see the enum members in program
1602 source order, we have to ensure that the order gets reversed while
1603 we are processing them.
1606 static struct type
*
1607 enum_type (struct dieinfo
*dip
, struct objfile
*objfile
)
1612 struct nextfield
*next
;
1615 struct nextfield
*list
= NULL
;
1616 struct nextfield
*new;
1621 unsigned short blocksz
;
1624 int unsigned_enum
= 1;
1626 if ((type
= lookup_utype (dip
->die_ref
)) == NULL
)
1628 /* No forward references created an empty type, so install one now */
1629 type
= alloc_utype (dip
->die_ref
, NULL
);
1631 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1632 /* Some compilers try to be helpful by inventing "fake" names for
1633 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1634 Thanks, but no thanks... */
1635 if (dip
->at_name
!= NULL
1636 && *dip
->at_name
!= '~'
1637 && *dip
->at_name
!= '.')
1639 TYPE_TAG_NAME (type
) = obconcat (&objfile
->type_obstack
,
1640 "", "", dip
->at_name
);
1642 if (dip
->at_byte_size
!= 0)
1644 TYPE_LENGTH (type
) = dip
->at_byte_size
;
1646 if ((scan
= dip
->at_element_list
) != NULL
)
1648 if (dip
->short_element_list
)
1650 nbytes
= attribute_size (AT_short_element_list
);
1654 nbytes
= attribute_size (AT_element_list
);
1656 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1657 listend
= scan
+ nbytes
+ blocksz
;
1659 while (scan
< listend
)
1661 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1664 FIELD_TYPE (list
->field
) = NULL
;
1665 FIELD_BITSIZE (list
->field
) = 0;
1666 FIELD_STATIC_KIND (list
->field
) = 0;
1667 FIELD_BITPOS (list
->field
) =
1668 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1670 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1671 list
->field
.name
= obsavestring (scan
, strlen (scan
),
1672 &objfile
->type_obstack
);
1673 scan
+= strlen (scan
) + 1;
1675 /* Handcraft a new symbol for this enum member. */
1676 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1677 sizeof (struct symbol
));
1678 memset (sym
, 0, sizeof (struct symbol
));
1679 DEPRECATED_SYMBOL_NAME (sym
) = create_name (list
->field
.name
,
1680 &objfile
->symbol_obstack
);
1681 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
1682 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1683 SYMBOL_CLASS (sym
) = LOC_CONST
;
1684 SYMBOL_TYPE (sym
) = type
;
1685 SYMBOL_VALUE (sym
) = FIELD_BITPOS (list
->field
);
1686 if (SYMBOL_VALUE (sym
) < 0)
1688 add_symbol_to_list (sym
, list_in_scope
);
1690 /* Now create the vector of fields, and record how big it is. This is
1691 where we reverse the order, by pulling the members off the list in
1692 reverse order from how they were inserted. If we have no fields
1693 (this is apparently possible in C++) then skip building a field
1698 TYPE_FLAGS (type
) |= TYPE_FLAG_UNSIGNED
;
1699 TYPE_NFIELDS (type
) = nfields
;
1700 TYPE_FIELDS (type
) = (struct field
*)
1701 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1702 /* Copy the saved-up fields into the field vector. */
1703 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
->next
)
1705 TYPE_FIELD (type
, n
++) = list
->field
;
1716 read_func_scope -- process all dies within a function scope
1720 Process all dies within a given function scope. We are passed
1721 a die information structure pointer DIP for the die which
1722 starts the function scope, and pointers into the raw die data
1723 that define the dies within the function scope.
1725 For now, we ignore lexical block scopes within the function.
1726 The problem is that AT&T cc does not define a DWARF lexical
1727 block scope for the function itself, while gcc defines a
1728 lexical block scope for the function. We need to think about
1729 how to handle this difference, or if it is even a problem.
1734 read_func_scope (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
1735 struct objfile
*objfile
)
1737 register struct context_stack
*new;
1739 /* AT_name is absent if the function is described with an
1740 AT_abstract_origin tag.
1741 Ignore the function description for now to avoid GDB core dumps.
1742 FIXME: Add code to handle AT_abstract_origin tags properly. */
1743 if (dip
->at_name
== NULL
)
1745 complaint (&symfile_complaints
, "DIE @ 0x%x, AT_name tag missing",
1750 if (objfile
->ei
.entry_point
>= dip
->at_low_pc
&&
1751 objfile
->ei
.entry_point
< dip
->at_high_pc
)
1753 objfile
->ei
.entry_func_lowpc
= dip
->at_low_pc
;
1754 objfile
->ei
.entry_func_highpc
= dip
->at_high_pc
;
1756 new = push_context (0, dip
->at_low_pc
);
1757 new->name
= new_symbol (dip
, objfile
);
1758 list_in_scope
= &local_symbols
;
1759 process_dies (thisdie
+ dip
->die_length
, enddie
, objfile
);
1760 new = pop_context ();
1761 /* Make a block for the local symbols within. */
1762 finish_block (new->name
, &local_symbols
, new->old_blocks
,
1763 new->start_addr
, dip
->at_high_pc
, objfile
);
1764 list_in_scope
= &file_symbols
;
1772 handle_producer -- process the AT_producer attribute
1776 Perform any operations that depend on finding a particular
1777 AT_producer attribute.
1782 handle_producer (char *producer
)
1785 /* If this compilation unit was compiled with g++ or gcc, then set the
1786 processing_gcc_compilation flag. */
1788 if (STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
)))
1790 char version
= producer
[strlen (GCC_PRODUCER
)];
1791 processing_gcc_compilation
= (version
== '2' ? 2 : 1);
1795 processing_gcc_compilation
=
1796 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
));
1799 /* Select a demangling style if we can identify the producer and if
1800 the current style is auto. We leave the current style alone if it
1801 is not auto. We also leave the demangling style alone if we find a
1802 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1804 if (AUTO_DEMANGLING
)
1806 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1809 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't
1810 know whether it will use the old style or v3 mangling. */
1811 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1814 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1816 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1826 read_file_scope -- process all dies within a file scope
1830 Process all dies within a given file scope. We are passed a
1831 pointer to the die information structure for the die which
1832 starts the file scope, and pointers into the raw die data which
1833 mark the range of dies within the file scope.
1835 When the partial symbol table is built, the file offset for the line
1836 number table for each compilation unit is saved in the partial symbol
1837 table entry for that compilation unit. As the symbols for each
1838 compilation unit are read, the line number table is read into memory
1839 and the variable lnbase is set to point to it. Thus all we have to
1840 do is use lnbase to access the line number table for the current
1845 read_file_scope (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
1846 struct objfile
*objfile
)
1848 struct cleanup
*back_to
;
1849 struct symtab
*symtab
;
1851 if (objfile
->ei
.entry_point
>= dip
->at_low_pc
&&
1852 objfile
->ei
.entry_point
< dip
->at_high_pc
)
1854 objfile
->ei
.entry_file_lowpc
= dip
->at_low_pc
;
1855 objfile
->ei
.entry_file_highpc
= dip
->at_high_pc
;
1857 set_cu_language (dip
);
1858 if (dip
->at_producer
!= NULL
)
1860 handle_producer (dip
->at_producer
);
1862 numutypes
= (enddie
- thisdie
) / 4;
1863 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1864 back_to
= make_cleanup (free_utypes
, NULL
);
1865 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1866 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1867 start_symtab (dip
->at_name
, dip
->at_comp_dir
, dip
->at_low_pc
);
1868 record_debugformat ("DWARF 1");
1869 decode_line_numbers (lnbase
);
1870 process_dies (thisdie
+ dip
->die_length
, enddie
, objfile
);
1872 symtab
= end_symtab (dip
->at_high_pc
, objfile
, 0);
1875 symtab
->language
= cu_language
;
1877 do_cleanups (back_to
);
1884 process_dies -- process a range of DWARF Information Entries
1888 static void process_dies (char *thisdie, char *enddie,
1889 struct objfile *objfile)
1893 Process all DIE's in a specified range. May be (and almost
1894 certainly will be) called recursively.
1898 process_dies (char *thisdie
, char *enddie
, struct objfile
*objfile
)
1903 while (thisdie
< enddie
)
1905 basicdieinfo (&di
, thisdie
, objfile
);
1906 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1910 else if (di
.die_tag
== TAG_padding
)
1912 nextdie
= thisdie
+ di
.die_length
;
1916 completedieinfo (&di
, objfile
);
1917 if (di
.at_sibling
!= 0)
1919 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1923 nextdie
= thisdie
+ di
.die_length
;
1925 /* I think that these are always text, not data, addresses. */
1926 di
.at_low_pc
= SMASH_TEXT_ADDRESS (di
.at_low_pc
);
1927 di
.at_high_pc
= SMASH_TEXT_ADDRESS (di
.at_high_pc
);
1930 case TAG_compile_unit
:
1931 /* Skip Tag_compile_unit if we are already inside a compilation
1932 unit, we are unable to handle nested compilation units
1933 properly (FIXME). */
1934 if (current_subfile
== NULL
)
1935 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
1937 nextdie
= thisdie
+ di
.die_length
;
1939 case TAG_global_subroutine
:
1940 case TAG_subroutine
:
1941 if (di
.has_at_low_pc
)
1943 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
1946 case TAG_lexical_block
:
1947 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
1949 case TAG_class_type
:
1950 case TAG_structure_type
:
1951 case TAG_union_type
:
1952 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
1954 case TAG_enumeration_type
:
1955 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
1957 case TAG_subroutine_type
:
1958 read_subroutine_type (&di
, thisdie
, nextdie
);
1960 case TAG_array_type
:
1961 dwarf_read_array_type (&di
);
1963 case TAG_pointer_type
:
1964 read_tag_pointer_type (&di
);
1966 case TAG_string_type
:
1967 read_tag_string_type (&di
);
1970 new_symbol (&di
, objfile
);
1982 decode_line_numbers -- decode a line number table fragment
1986 static void decode_line_numbers (char *tblscan, char *tblend,
1987 long length, long base, long line, long pc)
1991 Translate the DWARF line number information to gdb form.
1993 The ".line" section contains one or more line number tables, one for
1994 each ".line" section from the objects that were linked.
1996 The AT_stmt_list attribute for each TAG_source_file entry in the
1997 ".debug" section contains the offset into the ".line" section for the
1998 start of the table for that file.
2000 The table itself has the following structure:
2002 <table length><base address><source statement entry>
2003 4 bytes 4 bytes 10 bytes
2005 The table length is the total size of the table, including the 4 bytes
2006 for the length information.
2008 The base address is the address of the first instruction generated
2009 for the source file.
2011 Each source statement entry has the following structure:
2013 <line number><statement position><address delta>
2014 4 bytes 2 bytes 4 bytes
2016 The line number is relative to the start of the file, starting with
2019 The statement position either -1 (0xFFFF) or the number of characters
2020 from the beginning of the line to the beginning of the statement.
2022 The address delta is the difference between the base address and
2023 the address of the first instruction for the statement.
2025 Note that we must copy the bytes from the packed table to our local
2026 variables before attempting to use them, to avoid alignment problems
2027 on some machines, particularly RISC processors.
2031 Does gdb expect the line numbers to be sorted? They are now by
2032 chance/luck, but are not required to be. (FIXME)
2034 The line with number 0 is unused, gdb apparently can discover the
2035 span of the last line some other way. How? (FIXME)
2039 decode_line_numbers (char *linetable
)
2043 unsigned long length
;
2048 if (linetable
!= NULL
)
2050 tblscan
= tblend
= linetable
;
2051 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2053 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2055 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2056 GET_UNSIGNED
, current_objfile
);
2057 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2059 while (tblscan
< tblend
)
2061 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2063 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2064 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2066 tblscan
+= SIZEOF_LINETBL_DELTA
;
2070 record_line (current_subfile
, line
, pc
);
2080 locval -- compute the value of a location attribute
2084 static int locval (struct dieinfo *dip)
2088 Given pointer to a string of bytes that define a location, compute
2089 the location and return the value.
2090 A location description containing no atoms indicates that the
2091 object is optimized out. The optimized_out flag is set for those,
2092 the return value is meaningless.
2094 When computing values involving the current value of the frame pointer,
2095 the value zero is used, which results in a value relative to the frame
2096 pointer, rather than the absolute value. This is what GDB wants
2099 When the result is a register number, the isreg flag is set, otherwise
2100 it is cleared. This is a kludge until we figure out a better
2101 way to handle the problem. Gdb's design does not mesh well with the
2102 DWARF notion of a location computing interpreter, which is a shame
2103 because the flexibility goes unused.
2107 Note that stack[0] is unused except as a default error return.
2108 Note that stack overflow is not yet handled.
2112 locval (struct dieinfo
*dip
)
2114 unsigned short nbytes
;
2115 unsigned short locsize
;
2116 auto long stack
[64];
2123 loc
= dip
->at_location
;
2124 nbytes
= attribute_size (AT_location
);
2125 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2127 end
= loc
+ locsize
;
2132 dip
->optimized_out
= 1;
2133 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2136 dip
->optimized_out
= 0;
2137 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2139 loc
+= SIZEOF_LOC_ATOM_CODE
;
2140 switch (loc_atom_code
)
2147 /* push register (number) */
2149 = DWARF_REG_TO_REGNUM (target_to_host (loc
, loc_value_size
,
2152 loc
+= loc_value_size
;
2156 /* push value of register (number) */
2157 /* Actually, we compute the value as if register has 0, so the
2158 value ends up being the offset from that register. */
2160 dip
->basereg
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2162 loc
+= loc_value_size
;
2163 stack
[++stacki
] = 0;
2166 /* push address (relocated address) */
2167 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2168 GET_UNSIGNED
, current_objfile
);
2169 loc
+= loc_value_size
;
2172 /* push constant (number) FIXME: signed or unsigned! */
2173 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2174 GET_SIGNED
, current_objfile
);
2175 loc
+= loc_value_size
;
2178 /* pop, deref and push 2 bytes (as a long) */
2179 complaint (&symfile_complaints
,
2180 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%lx not handled",
2181 DIE_ID
, DIE_NAME
, stack
[stacki
]);
2183 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2184 complaint (&symfile_complaints
,
2185 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%lx not handled",
2186 DIE_ID
, DIE_NAME
, stack
[stacki
]);
2188 case OP_ADD
: /* pop top 2 items, add, push result */
2189 stack
[stacki
- 1] += stack
[stacki
];
2194 return (stack
[stacki
]);
2201 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2205 static void read_ofile_symtab (struct partial_symtab *pst)
2209 When expanding a partial symbol table entry to a full symbol table
2210 entry, this is the function that gets called to read in the symbols
2211 for the compilation unit. A pointer to the newly constructed symtab,
2212 which is now the new first one on the objfile's symtab list, is
2213 stashed in the partial symbol table entry.
2217 read_ofile_symtab (struct partial_symtab
*pst
)
2219 struct cleanup
*back_to
;
2220 unsigned long lnsize
;
2223 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2225 abfd
= pst
->objfile
->obfd
;
2226 current_objfile
= pst
->objfile
;
2228 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2229 unit, seek to the location in the file, and read in all the DIE's. */
2232 dbsize
= DBLENGTH (pst
);
2233 dbbase
= xmalloc (dbsize
);
2234 dbroff
= DBROFF (pst
);
2235 foffset
= DBFOFF (pst
) + dbroff
;
2236 base_section_offsets
= pst
->section_offsets
;
2237 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2238 if (bfd_seek (abfd
, foffset
, SEEK_SET
) ||
2239 (bfd_bread (dbbase
, dbsize
, abfd
) != dbsize
))
2242 error ("can't read DWARF data");
2244 back_to
= make_cleanup (xfree
, dbbase
);
2246 /* If there is a line number table associated with this compilation unit
2247 then read the size of this fragment in bytes, from the fragment itself.
2248 Allocate a buffer for the fragment and read it in for future
2254 if (bfd_seek (abfd
, LNFOFF (pst
), SEEK_SET
) ||
2255 (bfd_bread (lnsizedata
, sizeof (lnsizedata
), abfd
)
2256 != sizeof (lnsizedata
)))
2258 error ("can't read DWARF line number table size");
2260 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2261 GET_UNSIGNED
, pst
->objfile
);
2262 lnbase
= xmalloc (lnsize
);
2263 if (bfd_seek (abfd
, LNFOFF (pst
), SEEK_SET
) ||
2264 (bfd_bread (lnbase
, lnsize
, abfd
) != lnsize
))
2267 error ("can't read DWARF line numbers");
2269 make_cleanup (xfree
, lnbase
);
2272 process_dies (dbbase
, dbbase
+ dbsize
, pst
->objfile
);
2273 do_cleanups (back_to
);
2274 current_objfile
= NULL
;
2275 pst
->symtab
= pst
->objfile
->symtabs
;
2282 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2286 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2290 Called once for each partial symbol table entry that needs to be
2291 expanded into a full symbol table entry.
2296 psymtab_to_symtab_1 (struct partial_symtab
*pst
)
2299 struct cleanup
*old_chain
;
2305 warning ("psymtab for %s already read in. Shouldn't happen.",
2310 /* Read in all partial symtabs on which this one is dependent */
2311 for (i
= 0; i
< pst
->number_of_dependencies
; i
++)
2313 if (!pst
->dependencies
[i
]->readin
)
2315 /* Inform about additional files that need to be read in. */
2318 fputs_filtered (" ", gdb_stdout
);
2320 fputs_filtered ("and ", gdb_stdout
);
2322 printf_filtered ("%s...",
2323 pst
->dependencies
[i
]->filename
);
2325 gdb_flush (gdb_stdout
); /* Flush output */
2327 psymtab_to_symtab_1 (pst
->dependencies
[i
]);
2330 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2333 old_chain
= make_cleanup (really_free_pendings
, 0);
2334 read_ofile_symtab (pst
);
2337 printf_filtered ("%d DIE's, sorting...", diecount
);
2339 gdb_flush (gdb_stdout
);
2341 sort_symtab_syms (pst
->symtab
);
2342 do_cleanups (old_chain
);
2353 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2357 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2361 This is the DWARF support entry point for building a full symbol
2362 table entry from a partial symbol table entry. We are passed a
2363 pointer to the partial symbol table entry that needs to be expanded.
2368 dwarf_psymtab_to_symtab (struct partial_symtab
*pst
)
2375 warning ("psymtab for %s already read in. Shouldn't happen.",
2380 if (DBLENGTH (pst
) || pst
->number_of_dependencies
)
2382 /* Print the message now, before starting serious work, to avoid
2383 disconcerting pauses. */
2386 printf_filtered ("Reading in symbols for %s...",
2388 gdb_flush (gdb_stdout
);
2391 psymtab_to_symtab_1 (pst
);
2393 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2394 we need to do an equivalent or is this something peculiar to
2396 Match with global symbols. This only needs to be done once,
2397 after all of the symtabs and dependencies have been read in.
2399 scan_file_globals (pst
->objfile
);
2402 /* Finish up the verbose info message. */
2405 printf_filtered ("done.\n");
2406 gdb_flush (gdb_stdout
);
2417 add_enum_psymbol -- add enumeration members to partial symbol table
2421 Given pointer to a DIE that is known to be for an enumeration,
2422 extract the symbolic names of the enumeration members and add
2423 partial symbols for them.
2427 add_enum_psymbol (struct dieinfo
*dip
, struct objfile
*objfile
)
2431 unsigned short blocksz
;
2434 if ((scan
= dip
->at_element_list
) != NULL
)
2436 if (dip
->short_element_list
)
2438 nbytes
= attribute_size (AT_short_element_list
);
2442 nbytes
= attribute_size (AT_element_list
);
2444 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2446 listend
= scan
+ blocksz
;
2447 while (scan
< listend
)
2449 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2450 add_psymbol_to_list (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2451 &objfile
->static_psymbols
, 0, 0, cu_language
,
2453 scan
+= strlen (scan
) + 1;
2462 add_partial_symbol -- add symbol to partial symbol table
2466 Given a DIE, if it is one of the types that we want to
2467 add to a partial symbol table, finish filling in the die info
2468 and then add a partial symbol table entry for it.
2472 The caller must ensure that the DIE has a valid name attribute.
2476 add_partial_symbol (struct dieinfo
*dip
, struct objfile
*objfile
)
2478 switch (dip
->die_tag
)
2480 case TAG_global_subroutine
:
2481 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2482 VAR_NAMESPACE
, LOC_BLOCK
,
2483 &objfile
->global_psymbols
,
2484 0, dip
->at_low_pc
, cu_language
, objfile
);
2486 case TAG_global_variable
:
2487 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2488 VAR_NAMESPACE
, LOC_STATIC
,
2489 &objfile
->global_psymbols
,
2490 0, 0, cu_language
, objfile
);
2492 case TAG_subroutine
:
2493 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2494 VAR_NAMESPACE
, LOC_BLOCK
,
2495 &objfile
->static_psymbols
,
2496 0, dip
->at_low_pc
, cu_language
, objfile
);
2498 case TAG_local_variable
:
2499 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2500 VAR_NAMESPACE
, LOC_STATIC
,
2501 &objfile
->static_psymbols
,
2502 0, 0, cu_language
, objfile
);
2505 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2506 VAR_NAMESPACE
, LOC_TYPEDEF
,
2507 &objfile
->static_psymbols
,
2508 0, 0, cu_language
, objfile
);
2510 case TAG_class_type
:
2511 case TAG_structure_type
:
2512 case TAG_union_type
:
2513 case TAG_enumeration_type
:
2514 /* Do not add opaque aggregate definitions to the psymtab. */
2515 if (!dip
->has_at_byte_size
)
2517 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2518 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2519 &objfile
->static_psymbols
,
2520 0, 0, cu_language
, objfile
);
2521 if (cu_language
== language_cplus
)
2523 /* For C++, these implicitly act as typedefs as well. */
2524 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2525 VAR_NAMESPACE
, LOC_TYPEDEF
,
2526 &objfile
->static_psymbols
,
2527 0, 0, cu_language
, objfile
);
2537 scan_partial_symbols -- scan DIE's within a single compilation unit
2541 Process the DIE's within a single compilation unit, looking for
2542 interesting DIE's that contribute to the partial symbol table entry
2543 for this compilation unit.
2547 There are some DIE's that may appear both at file scope and within
2548 the scope of a function. We are only interested in the ones at file
2549 scope, and the only way to tell them apart is to keep track of the
2550 scope. For example, consider the test case:
2555 for which the relevant DWARF segment has the structure:
2558 0x23 global subrtn sibling 0x9b
2560 fund_type FT_integer
2565 0x23 local var sibling 0x97
2567 fund_type FT_integer
2568 location OP_BASEREG 0xe
2575 0x1d local var sibling 0xb8
2577 fund_type FT_integer
2578 location OP_ADDR 0x800025dc
2583 We want to include the symbol 'i' in the partial symbol table, but
2584 not the symbol 'j'. In essence, we want to skip all the dies within
2585 the scope of a TAG_global_subroutine DIE.
2587 Don't attempt to add anonymous structures or unions since they have
2588 no name. Anonymous enumerations however are processed, because we
2589 want to extract their member names (the check for a tag name is
2592 Also, for variables and subroutines, check that this is the place
2593 where the actual definition occurs, rather than just a reference
2601 scan_partial_symbols (char *thisdie
, char *enddie
, struct objfile
*objfile
)
2607 while (thisdie
< enddie
)
2609 basicdieinfo (&di
, thisdie
, objfile
);
2610 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2616 nextdie
= thisdie
+ di
.die_length
;
2617 /* To avoid getting complete die information for every die, we
2618 only do it (below) for the cases we are interested in. */
2621 case TAG_global_subroutine
:
2622 case TAG_subroutine
:
2623 completedieinfo (&di
, objfile
);
2624 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2626 add_partial_symbol (&di
, objfile
);
2627 /* If there is a sibling attribute, adjust the nextdie
2628 pointer to skip the entire scope of the subroutine.
2629 Apply some sanity checking to make sure we don't
2630 overrun or underrun the range of remaining DIE's */
2631 if (di
.at_sibling
!= 0)
2633 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2634 if ((temp
< thisdie
) || (temp
>= enddie
))
2636 bad_die_ref_complaint (DIE_ID
, DIE_NAME
,
2646 case TAG_global_variable
:
2647 case TAG_local_variable
:
2648 completedieinfo (&di
, objfile
);
2649 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2651 add_partial_symbol (&di
, objfile
);
2655 case TAG_class_type
:
2656 case TAG_structure_type
:
2657 case TAG_union_type
:
2658 completedieinfo (&di
, objfile
);
2661 add_partial_symbol (&di
, objfile
);
2664 case TAG_enumeration_type
:
2665 completedieinfo (&di
, objfile
);
2668 add_partial_symbol (&di
, objfile
);
2670 add_enum_psymbol (&di
, objfile
);
2682 scan_compilation_units -- build a psymtab entry for each compilation
2686 This is the top level dwarf parsing routine for building partial
2689 It scans from the beginning of the DWARF table looking for the first
2690 TAG_compile_unit DIE, and then follows the sibling chain to locate
2691 each additional TAG_compile_unit DIE.
2693 For each TAG_compile_unit DIE it creates a partial symtab structure,
2694 calls a subordinate routine to collect all the compilation unit's
2695 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2696 new partial symtab structure into the partial symbol table. It also
2697 records the appropriate information in the partial symbol table entry
2698 to allow the chunk of DIE's and line number table for this compilation
2699 unit to be located and re-read later, to generate a complete symbol
2700 table entry for the compilation unit.
2702 Thus it effectively partitions up a chunk of DIE's for multiple
2703 compilation units into smaller DIE chunks and line number tables,
2704 and associates them with a partial symbol table entry.
2708 If any compilation unit has no line number table associated with
2709 it for some reason (a missing at_stmt_list attribute, rather than
2710 just one with a value of zero, which is valid) then we ensure that
2711 the recorded file offset is zero so that the routine which later
2712 reads line number table fragments knows that there is no fragment
2722 scan_compilation_units (char *thisdie
, char *enddie
, file_ptr dbfoff
,
2723 file_ptr lnoffset
, struct objfile
*objfile
)
2727 struct partial_symtab
*pst
;
2730 file_ptr curlnoffset
;
2732 while (thisdie
< enddie
)
2734 basicdieinfo (&di
, thisdie
, objfile
);
2735 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2739 else if (di
.die_tag
!= TAG_compile_unit
)
2741 nextdie
= thisdie
+ di
.die_length
;
2745 completedieinfo (&di
, objfile
);
2746 set_cu_language (&di
);
2747 if (di
.at_sibling
!= 0)
2749 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2753 nextdie
= thisdie
+ di
.die_length
;
2755 curoff
= thisdie
- dbbase
;
2756 culength
= nextdie
- thisdie
;
2757 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2759 /* First allocate a new partial symbol table structure */
2761 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2762 di
.at_name
, di
.at_low_pc
,
2763 objfile
->global_psymbols
.next
,
2764 objfile
->static_psymbols
.next
);
2766 pst
->texthigh
= di
.at_high_pc
;
2767 pst
->read_symtab_private
= (char *)
2768 obstack_alloc (&objfile
->psymbol_obstack
,
2769 sizeof (struct dwfinfo
));
2770 DBFOFF (pst
) = dbfoff
;
2771 DBROFF (pst
) = curoff
;
2772 DBLENGTH (pst
) = culength
;
2773 LNFOFF (pst
) = curlnoffset
;
2774 pst
->read_symtab
= dwarf_psymtab_to_symtab
;
2776 /* Now look for partial symbols */
2778 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2780 pst
->n_global_syms
= objfile
->global_psymbols
.next
-
2781 (objfile
->global_psymbols
.list
+ pst
->globals_offset
);
2782 pst
->n_static_syms
= objfile
->static_psymbols
.next
-
2783 (objfile
->static_psymbols
.list
+ pst
->statics_offset
);
2784 sort_pst_symbols (pst
);
2785 /* If there is already a psymtab or symtab for a file of this name,
2786 remove it. (If there is a symtab, more drastic things also
2787 happen.) This happens in VxWorks. */
2788 free_named_symtabs (pst
->filename
);
2798 new_symbol -- make a symbol table entry for a new symbol
2802 static struct symbol *new_symbol (struct dieinfo *dip,
2803 struct objfile *objfile)
2807 Given a pointer to a DWARF information entry, figure out if we need
2808 to make a symbol table entry for it, and if so, create a new entry
2809 and return a pointer to it.
2812 static struct symbol
*
2813 new_symbol (struct dieinfo
*dip
, struct objfile
*objfile
)
2815 struct symbol
*sym
= NULL
;
2817 if (dip
->at_name
!= NULL
)
2819 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
2820 sizeof (struct symbol
));
2821 OBJSTAT (objfile
, n_syms
++);
2822 memset (sym
, 0, sizeof (struct symbol
));
2823 /* default assumptions */
2824 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2825 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2826 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2828 /* If this symbol is from a C++ compilation, then attempt to cache the
2829 demangled form for future reference. This is a typical time versus
2830 space tradeoff, that was decided in favor of time because it sped up
2831 C++ symbol lookups by a factor of about 20. */
2833 SYMBOL_LANGUAGE (sym
) = cu_language
;
2834 SYMBOL_SET_NAMES (sym
, dip
->at_name
, strlen (dip
->at_name
), objfile
);
2835 switch (dip
->die_tag
)
2838 SYMBOL_VALUE_ADDRESS (sym
) = dip
->at_low_pc
;
2839 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2841 case TAG_global_subroutine
:
2842 case TAG_subroutine
:
2843 SYMBOL_VALUE_ADDRESS (sym
) = dip
->at_low_pc
;
2844 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2845 if (dip
->at_prototyped
)
2846 TYPE_FLAGS (SYMBOL_TYPE (sym
)) |= TYPE_FLAG_PROTOTYPED
;
2847 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2848 if (dip
->die_tag
== TAG_global_subroutine
)
2850 add_symbol_to_list (sym
, &global_symbols
);
2854 add_symbol_to_list (sym
, list_in_scope
);
2857 case TAG_global_variable
:
2858 if (dip
->at_location
!= NULL
)
2860 SYMBOL_VALUE_ADDRESS (sym
) = locval (dip
);
2861 add_symbol_to_list (sym
, &global_symbols
);
2862 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2863 SYMBOL_VALUE (sym
) += baseaddr
;
2866 case TAG_local_variable
:
2867 if (dip
->at_location
!= NULL
)
2869 int loc
= locval (dip
);
2870 if (dip
->optimized_out
)
2872 SYMBOL_CLASS (sym
) = LOC_OPTIMIZED_OUT
;
2874 else if (dip
->isreg
)
2876 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2878 else if (dip
->offreg
)
2880 SYMBOL_CLASS (sym
) = LOC_BASEREG
;
2881 SYMBOL_BASEREG (sym
) = dip
->basereg
;
2885 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2886 SYMBOL_VALUE (sym
) += baseaddr
;
2888 if (SYMBOL_CLASS (sym
) == LOC_STATIC
)
2890 /* LOC_STATIC address class MUST use SYMBOL_VALUE_ADDRESS,
2891 which may store to a bigger location than SYMBOL_VALUE. */
2892 SYMBOL_VALUE_ADDRESS (sym
) = loc
;
2896 SYMBOL_VALUE (sym
) = loc
;
2898 add_symbol_to_list (sym
, list_in_scope
);
2901 case TAG_formal_parameter
:
2902 if (dip
->at_location
!= NULL
)
2904 SYMBOL_VALUE (sym
) = locval (dip
);
2906 add_symbol_to_list (sym
, list_in_scope
);
2909 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
2911 else if (dip
->offreg
)
2913 SYMBOL_CLASS (sym
) = LOC_BASEREG_ARG
;
2914 SYMBOL_BASEREG (sym
) = dip
->basereg
;
2918 SYMBOL_CLASS (sym
) = LOC_ARG
;
2921 case TAG_unspecified_parameters
:
2922 /* From varargs functions; gdb doesn't seem to have any interest in
2923 this information, so just ignore it for now. (FIXME?) */
2925 case TAG_class_type
:
2926 case TAG_structure_type
:
2927 case TAG_union_type
:
2928 case TAG_enumeration_type
:
2929 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2930 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
2931 add_symbol_to_list (sym
, list_in_scope
);
2934 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2935 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2936 add_symbol_to_list (sym
, list_in_scope
);
2939 /* Not a tag we recognize. Hopefully we aren't processing trash
2940 data, but since we must specifically ignore things we don't
2941 recognize, there is nothing else we should do at this point. */
2952 synthesize_typedef -- make a symbol table entry for a "fake" typedef
2956 static void synthesize_typedef (struct dieinfo *dip,
2957 struct objfile *objfile,
2962 Given a pointer to a DWARF information entry, synthesize a typedef
2963 for the name in the DIE, using the specified type.
2965 This is used for C++ class, structs, unions, and enumerations to
2966 set up the tag name as a type.
2971 synthesize_typedef (struct dieinfo
*dip
, struct objfile
*objfile
,
2974 struct symbol
*sym
= NULL
;
2976 if (dip
->at_name
!= NULL
)
2978 sym
= (struct symbol
*)
2979 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct symbol
));
2980 OBJSTAT (objfile
, n_syms
++);
2981 memset (sym
, 0, sizeof (struct symbol
));
2982 DEPRECATED_SYMBOL_NAME (sym
) = create_name (dip
->at_name
,
2983 &objfile
->symbol_obstack
);
2984 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
2985 SYMBOL_TYPE (sym
) = type
;
2986 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2987 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2988 add_symbol_to_list (sym
, list_in_scope
);
2996 decode_mod_fund_type -- decode a modified fundamental type
3000 static struct type *decode_mod_fund_type (char *typedata)
3004 Decode a block of data containing a modified fundamental
3005 type specification. TYPEDATA is a pointer to the block,
3006 which starts with a length containing the size of the rest
3007 of the block. At the end of the block is a fundmental type
3008 code value that gives the fundamental type. Everything
3009 in between are type modifiers.
3011 We simply compute the number of modifiers and call the general
3012 function decode_modified_type to do the actual work.
3015 static struct type
*
3016 decode_mod_fund_type (char *typedata
)
3018 struct type
*typep
= NULL
;
3019 unsigned short modcount
;
3022 /* Get the total size of the block, exclusive of the size itself */
3024 nbytes
= attribute_size (AT_mod_fund_type
);
3025 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3028 /* Deduct the size of the fundamental type bytes at the end of the block. */
3030 modcount
-= attribute_size (AT_fund_type
);
3032 /* Now do the actual decoding */
3034 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3042 decode_mod_u_d_type -- decode a modified user defined type
3046 static struct type *decode_mod_u_d_type (char *typedata)
3050 Decode a block of data containing a modified user defined
3051 type specification. TYPEDATA is a pointer to the block,
3052 which consists of a two byte length, containing the size
3053 of the rest of the block. At the end of the block is a
3054 four byte value that gives a reference to a user defined type.
3055 Everything in between are type modifiers.
3057 We simply compute the number of modifiers and call the general
3058 function decode_modified_type to do the actual work.
3061 static struct type
*
3062 decode_mod_u_d_type (char *typedata
)
3064 struct type
*typep
= NULL
;
3065 unsigned short modcount
;
3068 /* Get the total size of the block, exclusive of the size itself */
3070 nbytes
= attribute_size (AT_mod_u_d_type
);
3071 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3074 /* Deduct the size of the reference type bytes at the end of the block. */
3076 modcount
-= attribute_size (AT_user_def_type
);
3078 /* Now do the actual decoding */
3080 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3088 decode_modified_type -- decode modified user or fundamental type
3092 static struct type *decode_modified_type (char *modifiers,
3093 unsigned short modcount, int mtype)
3097 Decode a modified type, either a modified fundamental type or
3098 a modified user defined type. MODIFIERS is a pointer to the
3099 block of bytes that define MODCOUNT modifiers. Immediately
3100 following the last modifier is a short containing the fundamental
3101 type or a long containing the reference to the user defined
3102 type. Which one is determined by MTYPE, which is either
3103 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3104 type we are generating.
3106 We call ourself recursively to generate each modified type,`
3107 until MODCOUNT reaches zero, at which point we have consumed
3108 all the modifiers and generate either the fundamental type or
3109 user defined type. When the recursion unwinds, each modifier
3110 is applied in turn to generate the full modified type.
3114 If we find a modifier that we don't recognize, and it is not one
3115 of those reserved for application specific use, then we issue a
3116 warning and simply ignore the modifier.
3120 We currently ignore MOD_const and MOD_volatile. (FIXME)
3124 static struct type
*
3125 decode_modified_type (char *modifiers
, unsigned int modcount
, int mtype
)
3127 struct type
*typep
= NULL
;
3128 unsigned short fundtype
;
3137 case AT_mod_fund_type
:
3138 nbytes
= attribute_size (AT_fund_type
);
3139 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3141 typep
= decode_fund_type (fundtype
);
3143 case AT_mod_u_d_type
:
3144 nbytes
= attribute_size (AT_user_def_type
);
3145 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3147 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3149 typep
= alloc_utype (die_ref
, NULL
);
3153 complaint (&symfile_complaints
,
3154 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)",
3155 DIE_ID
, DIE_NAME
, mtype
);
3156 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3162 modifier
= *modifiers
++;
3163 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3166 case MOD_pointer_to
:
3167 typep
= lookup_pointer_type (typep
);
3169 case MOD_reference_to
:
3170 typep
= lookup_reference_type (typep
);
3173 complaint (&symfile_complaints
,
3174 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", DIE_ID
,
3175 DIE_NAME
); /* FIXME */
3178 complaint (&symfile_complaints
,
3179 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored",
3180 DIE_ID
, DIE_NAME
); /* FIXME */
3183 if (!(MOD_lo_user
<= (unsigned char) modifier
3184 && (unsigned char) modifier
<= MOD_hi_user
))
3186 complaint (&symfile_complaints
,
3187 "DIE @ 0x%x \"%s\", unknown type modifier %u", DIE_ID
,
3188 DIE_NAME
, modifier
);
3200 decode_fund_type -- translate basic DWARF type to gdb base type
3204 Given an integer that is one of the fundamental DWARF types,
3205 translate it to one of the basic internal gdb types and return
3206 a pointer to the appropriate gdb type (a "struct type *").
3210 For robustness, if we are asked to translate a fundamental
3211 type that we are unprepared to deal with, we return int so
3212 callers can always depend upon a valid type being returned,
3213 and so gdb may at least do something reasonable by default.
3214 If the type is not in the range of those types defined as
3215 application specific types, we also issue a warning.
3218 static struct type
*
3219 decode_fund_type (unsigned int fundtype
)
3221 struct type
*typep
= NULL
;
3227 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3230 case FT_boolean
: /* Was FT_set in AT&T version */
3231 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3234 case FT_pointer
: /* (void *) */
3235 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3236 typep
= lookup_pointer_type (typep
);
3240 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3243 case FT_signed_char
:
3244 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3247 case FT_unsigned_char
:
3248 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3252 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3255 case FT_signed_short
:
3256 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3259 case FT_unsigned_short
:
3260 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3264 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3267 case FT_signed_integer
:
3268 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3271 case FT_unsigned_integer
:
3272 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3276 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3279 case FT_signed_long
:
3280 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3283 case FT_unsigned_long
:
3284 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3288 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3291 case FT_signed_long_long
:
3292 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3295 case FT_unsigned_long_long
:
3296 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3300 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3303 case FT_dbl_prec_float
:
3304 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3307 case FT_ext_prec_float
:
3308 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3312 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3315 case FT_dbl_prec_complex
:
3316 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3319 case FT_ext_prec_complex
:
3320 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3327 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3328 if (!(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3330 complaint (&symfile_complaints
,
3331 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x",
3332 DIE_ID
, DIE_NAME
, fundtype
);
3343 create_name -- allocate a fresh copy of a string on an obstack
3347 Given a pointer to a string and a pointer to an obstack, allocates
3348 a fresh copy of the string on the specified obstack.
3353 create_name (char *name
, struct obstack
*obstackp
)
3358 length
= strlen (name
) + 1;
3359 newname
= (char *) obstack_alloc (obstackp
, length
);
3360 strcpy (newname
, name
);
3368 basicdieinfo -- extract the minimal die info from raw die data
3372 void basicdieinfo (char *diep, struct dieinfo *dip,
3373 struct objfile *objfile)
3377 Given a pointer to raw DIE data, and a pointer to an instance of a
3378 die info structure, this function extracts the basic information
3379 from the DIE data required to continue processing this DIE, along
3380 with some bookkeeping information about the DIE.
3382 The information we absolutely must have includes the DIE tag,
3383 and the DIE length. If we need the sibling reference, then we
3384 will have to call completedieinfo() to process all the remaining
3387 Note that since there is no guarantee that the data is properly
3388 aligned in memory for the type of access required (indirection
3389 through anything other than a char pointer), and there is no
3390 guarantee that it is in the same byte order as the gdb host,
3391 we call a function which deals with both alignment and byte
3392 swapping issues. Possibly inefficient, but quite portable.
3394 We also take care of some other basic things at this point, such
3395 as ensuring that the instance of the die info structure starts
3396 out completely zero'd and that curdie is initialized for use
3397 in error reporting if we have a problem with the current die.
3401 All DIE's must have at least a valid length, thus the minimum
3402 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3403 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3404 are forced to be TAG_padding DIES.
3406 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3407 that if a padding DIE is used for alignment and the amount needed is
3408 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3409 enough to align to the next alignment boundry.
3411 We do some basic sanity checking here, such as verifying that the
3412 length of the die would not cause it to overrun the recorded end of
3413 the buffer holding the DIE info. If we find a DIE that is either
3414 too small or too large, we force it's length to zero which should
3415 cause the caller to take appropriate action.
3419 basicdieinfo (struct dieinfo
*dip
, char *diep
, struct objfile
*objfile
)
3422 memset (dip
, 0, sizeof (struct dieinfo
));
3424 dip
->die_ref
= dbroff
+ (diep
- dbbase
);
3425 dip
->die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3427 if ((dip
->die_length
< SIZEOF_DIE_LENGTH
) ||
3428 ((diep
+ dip
->die_length
) > (dbbase
+ dbsize
)))
3430 complaint (&symfile_complaints
,
3431 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%ld bytes)",
3432 DIE_ID
, DIE_NAME
, dip
->die_length
);
3433 dip
->die_length
= 0;
3435 else if (dip
->die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3437 dip
->die_tag
= TAG_padding
;
3441 diep
+= SIZEOF_DIE_LENGTH
;
3442 dip
->die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3451 completedieinfo -- finish reading the information for a given DIE
3455 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3459 Given a pointer to an already partially initialized die info structure,
3460 scan the raw DIE data and finish filling in the die info structure
3461 from the various attributes found.
3463 Note that since there is no guarantee that the data is properly
3464 aligned in memory for the type of access required (indirection
3465 through anything other than a char pointer), and there is no
3466 guarantee that it is in the same byte order as the gdb host,
3467 we call a function which deals with both alignment and byte
3468 swapping issues. Possibly inefficient, but quite portable.
3472 Each time we are called, we increment the diecount variable, which
3473 keeps an approximate count of the number of dies processed for
3474 each compilation unit. This information is presented to the user
3475 if the info_verbose flag is set.
3480 completedieinfo (struct dieinfo
*dip
, struct objfile
*objfile
)
3482 char *diep
; /* Current pointer into raw DIE data */
3483 char *end
; /* Terminate DIE scan here */
3484 unsigned short attr
; /* Current attribute being scanned */
3485 unsigned short form
; /* Form of the attribute */
3486 int nbytes
; /* Size of next field to read */
3490 end
= diep
+ dip
->die_length
;
3491 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3494 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3495 diep
+= SIZEOF_ATTRIBUTE
;
3496 if ((nbytes
= attribute_size (attr
)) == -1)
3498 complaint (&symfile_complaints
,
3499 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes",
3507 dip
->at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3511 dip
->at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3515 dip
->at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3519 dip
->at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3523 dip
->at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3525 dip
->has_at_stmt_list
= 1;
3528 dip
->at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3530 dip
->at_low_pc
+= baseaddr
;
3531 dip
->has_at_low_pc
= 1;
3534 dip
->at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3536 dip
->at_high_pc
+= baseaddr
;
3539 dip
->at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3542 case AT_user_def_type
:
3543 dip
->at_user_def_type
= target_to_host (diep
, nbytes
,
3544 GET_UNSIGNED
, objfile
);
3547 dip
->at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3549 dip
->has_at_byte_size
= 1;
3552 dip
->at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3556 dip
->at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3560 dip
->at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3564 dip
->at_location
= diep
;
3566 case AT_mod_fund_type
:
3567 dip
->at_mod_fund_type
= diep
;
3569 case AT_subscr_data
:
3570 dip
->at_subscr_data
= diep
;
3572 case AT_mod_u_d_type
:
3573 dip
->at_mod_u_d_type
= diep
;
3575 case AT_element_list
:
3576 dip
->at_element_list
= diep
;
3577 dip
->short_element_list
= 0;
3579 case AT_short_element_list
:
3580 dip
->at_element_list
= diep
;
3581 dip
->short_element_list
= 1;
3583 case AT_discr_value
:
3584 dip
->at_discr_value
= diep
;
3586 case AT_string_length
:
3587 dip
->at_string_length
= diep
;
3590 dip
->at_name
= diep
;
3593 /* For now, ignore any "hostname:" portion, since gdb doesn't
3594 know how to deal with it. (FIXME). */
3595 dip
->at_comp_dir
= strrchr (diep
, ':');
3596 if (dip
->at_comp_dir
!= NULL
)
3602 dip
->at_comp_dir
= diep
;
3606 dip
->at_producer
= diep
;
3608 case AT_start_scope
:
3609 dip
->at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3612 case AT_stride_size
:
3613 dip
->at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3617 dip
->at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3621 dip
->at_prototyped
= diep
;
3624 /* Found an attribute that we are unprepared to handle. However
3625 it is specifically one of the design goals of DWARF that
3626 consumers should ignore unknown attributes. As long as the
3627 form is one that we recognize (so we know how to skip it),
3628 we can just ignore the unknown attribute. */
3631 form
= FORM_FROM_ATTR (attr
);
3645 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3648 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3651 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3654 diep
+= strlen (diep
) + 1;
3657 unknown_attribute_form_complaint (DIE_ID
, DIE_NAME
, form
);
3668 target_to_host -- swap in target data to host
3672 target_to_host (char *from, int nbytes, int signextend,
3673 struct objfile *objfile)
3677 Given pointer to data in target format in FROM, a byte count for
3678 the size of the data in NBYTES, a flag indicating whether or not
3679 the data is signed in SIGNEXTEND, and a pointer to the current
3680 objfile in OBJFILE, convert the data to host format and return
3681 the converted value.
3685 FIXME: If we read data that is known to be signed, and expect to
3686 use it as signed data, then we need to explicitly sign extend the
3687 result until the bfd library is able to do this for us.
3689 FIXME: Would a 32 bit target ever need an 8 byte result?
3694 target_to_host (char *from
, int nbytes
, int signextend
, /* FIXME: Unused */
3695 struct objfile
*objfile
)
3702 rtnval
= bfd_get_64 (objfile
->obfd
, (bfd_byte
*) from
);
3705 rtnval
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) from
);
3708 rtnval
= bfd_get_16 (objfile
->obfd
, (bfd_byte
*) from
);
3711 rtnval
= bfd_get_8 (objfile
->obfd
, (bfd_byte
*) from
);
3714 complaint (&symfile_complaints
,
3715 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object",
3716 DIE_ID
, DIE_NAME
, nbytes
);
3727 attribute_size -- compute size of data for a DWARF attribute
3731 static int attribute_size (unsigned int attr)
3735 Given a DWARF attribute in ATTR, compute the size of the first
3736 piece of data associated with this attribute and return that
3739 Returns -1 for unrecognized attributes.
3744 attribute_size (unsigned int attr
)
3746 int nbytes
; /* Size of next data for this attribute */
3747 unsigned short form
; /* Form of the attribute */
3749 form
= FORM_FROM_ATTR (attr
);
3752 case FORM_STRING
: /* A variable length field is next */
3755 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3756 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3759 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3760 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3761 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3764 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3767 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3768 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3771 unknown_attribute_form_complaint (DIE_ID
, DIE_NAME
, form
);