1 /* DWARF debugging format support for GDB.
3 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
6 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
7 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 If you are looking for DWARF-2 support, you are in the wrong file.
27 Go look in dwarf2read.c. This file is for the original DWARF.
29 DWARF (also known as DWARF-1) is headed for obsoletion.
31 In gcc 3.2.1, these targets prefer dwarf-1:
33 i[34567]86-sequent-ptx4* # TD-R2
34 i[34567]86-sequent-sysv4* # TD-R2
35 i[34567]86-dg-dgux* # obsolete in gcc 3.2.1, to be removed in 3.3
37 mips-sni-sysv4 # TD-R2
38 sparc-hal-solaris2* # TD-R2
40 Configurations marked with "# TD-R2" are on Zach Weinberg's list
41 of "Target Deprecation, Round 2". This is a candidate list of
42 targets to be deprecated in gcc 3.3 and removed in gcc 3.4.
44 http://gcc.gnu.org/ml/gcc/2002-12/msg00702.html
46 gcc 2.95.3 had many configurations which prefer dwarf-1.
47 We may have to support dwarf-1 as long as we support gcc 2.95.3.
48 This could use more analysis.
50 DG/UX (Data General Unix) used dwarf-1 for its native format.
51 DG/UX uses gcc for its system C compiler, but they have their
52 own linker and their own debuggers.
54 Takis Psarogiannakopoulos has a complete gnu toolchain for DG/UX
55 with gcc 2.95.3, gdb 5.1, and debug formats of dwarf-2 and stabs.
56 For more info, see PR gdb/979 and PR gdb/1013; also:
58 http://sources.redhat.com/ml/gdb/2003-02/msg00074.html
60 There may be non-gcc compilers that still emit dwarf-1.
62 -- chastain 2003-02-04
67 FIXME: Do we need to generate dependencies in partial symtabs?
68 (Perhaps we don't need to).
70 FIXME: Resolve minor differences between what information we put in the
71 partial symbol table and what dbxread puts in. For example, we don't yet
72 put enum constants there. And dbxread seems to invent a lot of typedefs
73 we never see. Use the new printpsym command to see the partial symbol table
76 FIXME: Figure out a better way to tell gdb about the name of the function
77 contain the user's entry point (I.E. main())
79 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
80 other things to work on, if you get bored. :-)
89 #include "elf/dwarf.h"
92 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
94 #include "complaints.h"
97 #include "gdb_string.h"
99 /* Some macros to provide DIE info for complaints. */
101 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
102 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
104 /* Complaints that can be issued during DWARF debug info reading. */
107 bad_die_ref_complaint (int arg1
, const char *arg2
, int arg3
)
109 complaint (&symfile_complaints
,
110 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit",
115 unknown_attribute_form_complaint (int arg1
, const char *arg2
, int arg3
)
117 complaint (&symfile_complaints
,
118 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", arg1
, arg2
,
123 dup_user_type_definition_complaint (int arg1
, const char *arg2
)
125 complaint (&symfile_complaints
,
126 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition",
131 bad_array_element_type_complaint (int arg1
, const char *arg2
, int arg3
)
133 complaint (&symfile_complaints
,
134 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", arg1
,
138 typedef unsigned int DIE_REF
; /* Reference to a DIE */
141 #define GCC_PRODUCER "GNU C "
144 #ifndef GPLUS_PRODUCER
145 #define GPLUS_PRODUCER "GNU C++ "
149 #define LCC_PRODUCER "NCR C/C++"
152 /* Flags to target_to_host() that tell whether or not the data object is
153 expected to be signed. Used, for example, when fetching a signed
154 integer in the target environment which is used as a signed integer
155 in the host environment, and the two environments have different sized
156 ints. In this case, *somebody* has to sign extend the smaller sized
159 #define GET_UNSIGNED 0 /* No sign extension required */
160 #define GET_SIGNED 1 /* Sign extension required */
162 /* Defines for things which are specified in the document "DWARF Debugging
163 Information Format" published by UNIX International, Programming Languages
164 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
166 #define SIZEOF_DIE_LENGTH 4
167 #define SIZEOF_DIE_TAG 2
168 #define SIZEOF_ATTRIBUTE 2
169 #define SIZEOF_FORMAT_SPECIFIER 1
170 #define SIZEOF_FMT_FT 2
171 #define SIZEOF_LINETBL_LENGTH 4
172 #define SIZEOF_LINETBL_LINENO 4
173 #define SIZEOF_LINETBL_STMT 2
174 #define SIZEOF_LINETBL_DELTA 4
175 #define SIZEOF_LOC_ATOM_CODE 1
177 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
179 /* Macros that return the sizes of various types of data in the target
182 FIXME: Currently these are just compile time constants (as they are in
183 other parts of gdb as well). They need to be able to get the right size
184 either from the bfd or possibly from the DWARF info. It would be nice if
185 the DWARF producer inserted DIES that describe the fundamental types in
186 the target environment into the DWARF info, similar to the way dbx stabs
187 producers produce information about their fundamental types. */
189 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
190 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
192 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
193 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
194 However, the Issue 2 DWARF specification from AT&T defines it as
195 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
196 For backwards compatibility with the AT&T compiler produced executables
197 we define AT_short_element_list for this variant. */
199 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
201 /* The DWARF debugging information consists of two major pieces,
202 one is a block of DWARF Information Entries (DIE's) and the other
203 is a line number table. The "struct dieinfo" structure contains
204 the information for a single DIE, the one currently being processed.
206 In order to make it easier to randomly access the attribute fields
207 of the current DIE, which are specifically unordered within the DIE,
208 each DIE is scanned and an instance of the "struct dieinfo"
209 structure is initialized.
211 Initialization is done in two levels. The first, done by basicdieinfo(),
212 just initializes those fields that are vital to deciding whether or not
213 to use this DIE, how to skip past it, etc. The second, done by the
214 function completedieinfo(), fills in the rest of the information.
216 Attributes which have block forms are not interpreted at the time
217 the DIE is scanned, instead we just save pointers to the start
218 of their value fields.
220 Some fields have a flag <name>_p that is set when the value of the
221 field is valid (I.E. we found a matching attribute in the DIE). Since
222 we may want to test for the presence of some attributes in the DIE,
223 such as AT_low_pc, without restricting the values of the field,
224 we need someway to note that we found such an attribute.
232 char *die
; /* Pointer to the raw DIE data */
233 unsigned long die_length
; /* Length of the raw DIE data */
234 DIE_REF die_ref
; /* Offset of this DIE */
235 unsigned short die_tag
; /* Tag for this DIE */
236 unsigned long at_padding
;
237 unsigned long at_sibling
;
240 unsigned short at_fund_type
;
241 BLOCK
*at_mod_fund_type
;
242 unsigned long at_user_def_type
;
243 BLOCK
*at_mod_u_d_type
;
244 unsigned short at_ordering
;
245 BLOCK
*at_subscr_data
;
246 unsigned long at_byte_size
;
247 unsigned short at_bit_offset
;
248 unsigned long at_bit_size
;
249 BLOCK
*at_element_list
;
250 unsigned long at_stmt_list
;
252 CORE_ADDR at_high_pc
;
253 unsigned long at_language
;
254 unsigned long at_member
;
255 unsigned long at_discr
;
256 BLOCK
*at_discr_value
;
257 BLOCK
*at_string_length
;
260 unsigned long at_start_scope
;
261 unsigned long at_stride_size
;
262 unsigned long at_src_info
;
264 unsigned int has_at_low_pc
:1;
265 unsigned int has_at_stmt_list
:1;
266 unsigned int has_at_byte_size
:1;
267 unsigned int short_element_list
:1;
269 /* Kludge to identify register variables */
273 /* Kludge to identify optimized out variables */
275 unsigned int optimized_out
;
277 /* Kludge to identify basereg references.
278 Nonzero if we have an offset relative to a basereg. */
282 /* Kludge to identify which base register is it relative to. */
284 unsigned int basereg
;
287 static int diecount
; /* Approximate count of dies for compilation unit */
288 static struct dieinfo
*curdie
; /* For warnings and such */
290 static char *dbbase
; /* Base pointer to dwarf info */
291 static int dbsize
; /* Size of dwarf info in bytes */
292 static int dbroff
; /* Relative offset from start of .debug section */
293 static char *lnbase
; /* Base pointer to line section */
295 /* This value is added to each symbol value. FIXME: Generalize to
296 the section_offsets structure used by dbxread (once this is done,
297 pass the appropriate section number to end_symtab). */
298 static CORE_ADDR baseaddr
; /* Add to each symbol value */
300 /* The section offsets used in the current psymtab or symtab. FIXME,
301 only used to pass one value (baseaddr) at the moment. */
302 static struct section_offsets
*base_section_offsets
;
304 /* We put a pointer to this structure in the read_symtab_private field
309 /* Always the absolute file offset to the start of the ".debug"
310 section for the file containing the DIE's being accessed. */
312 /* Relative offset from the start of the ".debug" section to the
313 first DIE to be accessed. When building the partial symbol
314 table, this value will be zero since we are accessing the
315 entire ".debug" section. When expanding a partial symbol
316 table entry, this value will be the offset to the first
317 DIE for the compilation unit containing the symbol that
318 triggers the expansion. */
320 /* The size of the chunk of DIE's being examined, in bytes. */
322 /* The absolute file offset to the line table fragment. Ignored
323 when building partial symbol tables, but used when expanding
324 them, and contains the absolute file offset to the fragment
325 of the ".line" section containing the line numbers for the
326 current compilation unit. */
330 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
331 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
332 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
333 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
335 /* The generic symbol table building routines have separate lists for
336 file scope symbols and all all other scopes (local scopes). So
337 we need to select the right one to pass to add_symbol_to_list().
338 We do it by keeping a pointer to the correct list in list_in_scope.
340 FIXME: The original dwarf code just treated the file scope as the first
341 local scope, and all other local scopes as nested local scopes, and worked
342 fine. Check to see if we really need to distinguish these in buildsym.c */
344 struct pending
**list_in_scope
= &file_symbols
;
346 /* DIES which have user defined types or modified user defined types refer to
347 other DIES for the type information. Thus we need to associate the offset
348 of a DIE for a user defined type with a pointer to the type information.
350 Originally this was done using a simple but expensive algorithm, with an
351 array of unsorted structures, each containing an offset/type-pointer pair.
352 This array was scanned linearly each time a lookup was done. The result
353 was that gdb was spending over half it's startup time munging through this
354 array of pointers looking for a structure that had the right offset member.
356 The second attempt used the same array of structures, but the array was
357 sorted using qsort each time a new offset/type was recorded, and a binary
358 search was used to find the type pointer for a given DIE offset. This was
359 even slower, due to the overhead of sorting the array each time a new
360 offset/type pair was entered.
362 The third attempt uses a fixed size array of type pointers, indexed by a
363 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
364 we can divide any DIE offset by 4 to obtain a unique index into this fixed
365 size array. Since each element is a 4 byte pointer, it takes exactly as
366 much memory to hold this array as to hold the DWARF info for a given
367 compilation unit. But it gets freed as soon as we are done with it.
368 This has worked well in practice, as a reasonable tradeoff between memory
369 consumption and speed, without having to resort to much more complicated
372 static struct type
**utypes
; /* Pointer to array of user type pointers */
373 static int numutypes
; /* Max number of user type pointers */
375 /* Maintain an array of referenced fundamental types for the current
376 compilation unit being read. For DWARF version 1, we have to construct
377 the fundamental types on the fly, since no information about the
378 fundamental types is supplied. Each such fundamental type is created by
379 calling a language dependent routine to create the type, and then a
380 pointer to that type is then placed in the array at the index specified
381 by it's FT_<TYPENAME> value. The array has a fixed size set by the
382 FT_NUM_MEMBERS compile time constant, which is the number of predefined
383 fundamental types gdb knows how to construct. */
385 static struct type
*ftypes
[FT_NUM_MEMBERS
]; /* Fundamental types */
387 /* Record the language for the compilation unit which is currently being
388 processed. We know it once we have seen the TAG_compile_unit DIE,
389 and we need it while processing the DIE's for that compilation unit.
390 It is eventually saved in the symtab structure, but we don't finalize
391 the symtab struct until we have processed all the DIE's for the
392 compilation unit. We also need to get and save a pointer to the
393 language struct for this language, so we can call the language
394 dependent routines for doing things such as creating fundamental
397 static enum language cu_language
;
398 static const struct language_defn
*cu_language_defn
;
400 /* Forward declarations of static functions so we don't have to worry
401 about ordering within this file. */
403 static void free_utypes (void *);
405 static int attribute_size (unsigned int);
407 static CORE_ADDR
target_to_host (char *, int, int, struct objfile
*);
409 static void add_enum_psymbol (struct dieinfo
*, struct objfile
*);
411 static void handle_producer (char *);
413 static void read_file_scope (struct dieinfo
*, char *, char *,
416 static void read_func_scope (struct dieinfo
*, char *, char *,
419 static void read_lexical_block_scope (struct dieinfo
*, char *, char *,
422 static void scan_partial_symbols (char *, char *, struct objfile
*);
424 static void scan_compilation_units (char *, char *, file_ptr
, file_ptr
,
427 static void add_partial_symbol (struct dieinfo
*, struct objfile
*);
429 static void basicdieinfo (struct dieinfo
*, char *, struct objfile
*);
431 static void completedieinfo (struct dieinfo
*, struct objfile
*);
433 static void dwarf_psymtab_to_symtab (struct partial_symtab
*);
435 static void psymtab_to_symtab_1 (struct partial_symtab
*);
437 static void read_ofile_symtab (struct partial_symtab
*);
439 static void process_dies (char *, char *, struct objfile
*);
441 static void read_structure_scope (struct dieinfo
*, char *, char *,
444 static struct type
*decode_array_element_type (char *);
446 static struct type
*decode_subscript_data_item (char *, char *);
448 static void dwarf_read_array_type (struct dieinfo
*);
450 static void read_tag_pointer_type (struct dieinfo
*dip
);
452 static void read_tag_string_type (struct dieinfo
*dip
);
454 static void read_subroutine_type (struct dieinfo
*, char *, char *);
456 static void read_enumeration (struct dieinfo
*, char *, char *,
459 static struct type
*struct_type (struct dieinfo
*, char *, char *,
462 static struct type
*enum_type (struct dieinfo
*, struct objfile
*);
464 static void decode_line_numbers (char *);
466 static struct type
*decode_die_type (struct dieinfo
*);
468 static struct type
*decode_mod_fund_type (char *);
470 static struct type
*decode_mod_u_d_type (char *);
472 static struct type
*decode_modified_type (char *, unsigned int, int);
474 static struct type
*decode_fund_type (unsigned int);
476 static char *create_name (char *, struct obstack
*);
478 static struct type
*lookup_utype (DIE_REF
);
480 static struct type
*alloc_utype (DIE_REF
, struct type
*);
482 static struct symbol
*new_symbol (struct dieinfo
*, struct objfile
*);
484 static void synthesize_typedef (struct dieinfo
*, struct objfile
*,
487 static int locval (struct dieinfo
*);
489 static void set_cu_language (struct dieinfo
*);
491 static struct type
*dwarf_fundamental_type (struct objfile
*, int);
498 dwarf_fundamental_type -- lookup or create a fundamental type
503 dwarf_fundamental_type (struct objfile *objfile, int typeid)
507 DWARF version 1 doesn't supply any fundamental type information,
508 so gdb has to construct such types. It has a fixed number of
509 fundamental types that it knows how to construct, which is the
510 union of all types that it knows how to construct for all languages
511 that it knows about. These are enumerated in gdbtypes.h.
513 As an example, assume we find a DIE that references a DWARF
514 fundamental type of FT_integer. We first look in the ftypes
515 array to see if we already have such a type, indexed by the
516 gdb internal value of FT_INTEGER. If so, we simply return a
517 pointer to that type. If not, then we ask an appropriate
518 language dependent routine to create a type FT_INTEGER, using
519 defaults reasonable for the current target machine, and install
520 that type in ftypes for future reference.
524 Pointer to a fundamental type.
529 dwarf_fundamental_type (struct objfile
*objfile
, int typeid)
531 if (typeid < 0 || typeid >= FT_NUM_MEMBERS
)
533 error ("internal error - invalid fundamental type id %d", typeid);
536 /* Look for this particular type in the fundamental type vector. If one is
537 not found, create and install one appropriate for the current language
538 and the current target machine. */
540 if (ftypes
[typeid] == NULL
)
542 ftypes
[typeid] = cu_language_defn
->la_fund_type (objfile
, typeid);
545 return (ftypes
[typeid]);
552 set_cu_language -- set local copy of language for compilation unit
557 set_cu_language (struct dieinfo *dip)
561 Decode the language attribute for a compilation unit DIE and
562 remember what the language was. We use this at various times
563 when processing DIE's for a given compilation unit.
572 set_cu_language (struct dieinfo
*dip
)
574 switch (dip
->at_language
)
578 cu_language
= language_c
;
580 case LANG_C_PLUS_PLUS
:
581 cu_language
= language_cplus
;
584 cu_language
= language_m2
;
588 cu_language
= language_fortran
;
594 /* We don't know anything special about these yet. */
595 cu_language
= language_unknown
;
598 /* If no at_language, try to deduce one from the filename */
599 cu_language
= deduce_language_from_filename (dip
->at_name
);
602 cu_language_defn
= language_def (cu_language
);
609 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
613 void dwarf_build_psymtabs (struct objfile *objfile,
614 int mainline, file_ptr dbfoff, unsigned int dbfsize,
615 file_ptr lnoffset, unsigned int lnsize)
619 This function is called upon to build partial symtabs from files
620 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
622 It is passed a bfd* containing the DIES
623 and line number information, the corresponding filename for that
624 file, a base address for relocating the symbols, a flag indicating
625 whether or not this debugging information is from a "main symbol
626 table" rather than a shared library or dynamically linked file,
627 and file offset/size pairs for the DIE information and line number
637 dwarf_build_psymtabs (struct objfile
*objfile
, int mainline
, file_ptr dbfoff
,
638 unsigned int dbfsize
, file_ptr lnoffset
,
641 bfd
*abfd
= objfile
->obfd
;
642 struct cleanup
*back_to
;
644 current_objfile
= objfile
;
646 dbbase
= xmalloc (dbsize
);
648 if ((bfd_seek (abfd
, dbfoff
, SEEK_SET
) != 0) ||
649 (bfd_bread (dbbase
, dbsize
, abfd
) != dbsize
))
652 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
654 back_to
= make_cleanup (xfree
, dbbase
);
656 /* If we are reinitializing, or if we have never loaded syms yet, init.
657 Since we have no idea how many DIES we are looking at, we just guess
658 some arbitrary value. */
661 || (objfile
->global_psymbols
.size
== 0
662 && objfile
->static_psymbols
.size
== 0))
664 init_psymbol_list (objfile
, 1024);
667 /* Save the relocation factor where everybody can see it. */
669 base_section_offsets
= objfile
->section_offsets
;
670 baseaddr
= ANOFFSET (objfile
->section_offsets
, 0);
672 /* Follow the compilation unit sibling chain, building a partial symbol
673 table entry for each one. Save enough information about each compilation
674 unit to locate the full DWARF information later. */
676 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
678 do_cleanups (back_to
);
679 current_objfile
= NULL
;
686 read_lexical_block_scope -- process all dies in a lexical block
690 static void read_lexical_block_scope (struct dieinfo *dip,
691 char *thisdie, char *enddie)
695 Process all the DIES contained within a lexical block scope.
696 Start a new scope, process the dies, and then close the scope.
701 read_lexical_block_scope (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
702 struct objfile
*objfile
)
704 struct context_stack
*new;
706 push_context (0, dip
->at_low_pc
);
707 process_dies (thisdie
+ dip
->die_length
, enddie
, objfile
);
708 new = pop_context ();
709 if (local_symbols
!= NULL
)
711 finish_block (0, &local_symbols
, new->old_blocks
, new->start_addr
,
712 dip
->at_high_pc
, objfile
);
714 local_symbols
= new->locals
;
721 lookup_utype -- look up a user defined type from die reference
725 static type *lookup_utype (DIE_REF die_ref)
729 Given a DIE reference, lookup the user defined type associated with
730 that DIE, if it has been registered already. If not registered, then
731 return NULL. Alloc_utype() can be called to register an empty
732 type for this reference, which will be filled in later when the
733 actual referenced DIE is processed.
737 lookup_utype (DIE_REF die_ref
)
739 struct type
*type
= NULL
;
742 utypeidx
= (die_ref
- dbroff
) / 4;
743 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
745 bad_die_ref_complaint (DIE_ID
, DIE_NAME
, die_ref
);
749 type
= *(utypes
+ utypeidx
);
759 alloc_utype -- add a user defined type for die reference
763 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
767 Given a die reference DIE_REF, and a possible pointer to a user
768 defined type UTYPEP, register that this reference has a user
769 defined type and either use the specified type in UTYPEP or
770 make a new empty type that will be filled in later.
772 We should only be called after calling lookup_utype() to verify that
773 there is not currently a type registered for DIE_REF.
777 alloc_utype (DIE_REF die_ref
, struct type
*utypep
)
782 utypeidx
= (die_ref
- dbroff
) / 4;
783 typep
= utypes
+ utypeidx
;
784 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
786 utypep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
787 bad_die_ref_complaint (DIE_ID
, DIE_NAME
, die_ref
);
789 else if (*typep
!= NULL
)
792 complaint (&symfile_complaints
,
793 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation",
800 utypep
= alloc_type (current_objfile
);
811 free_utypes -- free the utypes array and reset pointer & count
815 static void free_utypes (void *dummy)
819 Called via do_cleanups to free the utypes array, reset the pointer to NULL,
820 and set numutypes back to zero. This ensures that the utypes does not get
821 referenced after being freed.
825 free_utypes (void *dummy
)
837 decode_die_type -- return a type for a specified die
841 static struct type *decode_die_type (struct dieinfo *dip)
845 Given a pointer to a die information structure DIP, decode the
846 type of the die and return a pointer to the decoded type. All
847 dies without specific types default to type int.
851 decode_die_type (struct dieinfo
*dip
)
853 struct type
*type
= NULL
;
855 if (dip
->at_fund_type
!= 0)
857 type
= decode_fund_type (dip
->at_fund_type
);
859 else if (dip
->at_mod_fund_type
!= NULL
)
861 type
= decode_mod_fund_type (dip
->at_mod_fund_type
);
863 else if (dip
->at_user_def_type
)
865 type
= lookup_utype (dip
->at_user_def_type
);
868 type
= alloc_utype (dip
->at_user_def_type
, NULL
);
871 else if (dip
->at_mod_u_d_type
)
873 type
= decode_mod_u_d_type (dip
->at_mod_u_d_type
);
877 type
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
886 struct_type -- compute and return the type for a struct or union
890 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
891 char *enddie, struct objfile *objfile)
895 Given pointer to a die information structure for a die which
896 defines a union or structure (and MUST define one or the other),
897 and pointers to the raw die data that define the range of dies which
898 define the members, compute and return the user defined type for the
903 struct_type (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
904 struct objfile
*objfile
)
909 struct nextfield
*next
;
912 struct nextfield
*list
= NULL
;
913 struct nextfield
*new;
920 type
= lookup_utype (dip
->die_ref
);
923 /* No forward references created an empty type, so install one now */
924 type
= alloc_utype (dip
->die_ref
, NULL
);
926 INIT_CPLUS_SPECIFIC (type
);
927 switch (dip
->die_tag
)
930 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
932 case TAG_structure_type
:
933 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
936 TYPE_CODE (type
) = TYPE_CODE_UNION
;
939 /* Should never happen */
940 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
941 complaint (&symfile_complaints
,
942 "DIE @ 0x%x \"%s\", missing class, structure, or union tag",
946 /* Some compilers try to be helpful by inventing "fake" names for
947 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
948 Thanks, but no thanks... */
949 if (dip
->at_name
!= NULL
950 && *dip
->at_name
!= '~'
951 && *dip
->at_name
!= '.')
953 TYPE_TAG_NAME (type
) = obconcat (&objfile
->type_obstack
,
954 "", "", dip
->at_name
);
956 /* Use whatever size is known. Zero is a valid size. We might however
957 wish to check has_at_byte_size to make sure that some byte size was
958 given explicitly, but DWARF doesn't specify that explicit sizes of
959 zero have to present, so complaining about missing sizes should
960 probably not be the default. */
961 TYPE_LENGTH (type
) = dip
->at_byte_size
;
962 thisdie
+= dip
->die_length
;
963 while (thisdie
< enddie
)
965 basicdieinfo (&mbr
, thisdie
, objfile
);
966 completedieinfo (&mbr
, objfile
);
967 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
971 else if (mbr
.at_sibling
!= 0)
973 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
977 nextdie
= thisdie
+ mbr
.die_length
;
982 /* Get space to record the next field's data. */
983 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
988 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
989 &objfile
->type_obstack
);
990 FIELD_TYPE (list
->field
) = decode_die_type (&mbr
);
991 FIELD_BITPOS (list
->field
) = 8 * locval (&mbr
);
992 FIELD_STATIC_KIND (list
->field
) = 0;
993 /* Handle bit fields. */
994 FIELD_BITSIZE (list
->field
) = mbr
.at_bit_size
;
997 /* For big endian bits, the at_bit_offset gives the
998 additional bit offset from the MSB of the containing
999 anonymous object to the MSB of the field. We don't
1000 have to do anything special since we don't need to
1001 know the size of the anonymous object. */
1002 FIELD_BITPOS (list
->field
) += mbr
.at_bit_offset
;
1006 /* For little endian bits, we need to have a non-zero
1007 at_bit_size, so that we know we are in fact dealing
1008 with a bitfield. Compute the bit offset to the MSB
1009 of the anonymous object, subtract off the number of
1010 bits from the MSB of the field to the MSB of the
1011 object, and then subtract off the number of bits of
1012 the field itself. The result is the bit offset of
1013 the LSB of the field. */
1014 if (mbr
.at_bit_size
> 0)
1016 if (mbr
.has_at_byte_size
)
1018 /* The size of the anonymous object containing
1019 the bit field is explicit, so use the
1020 indicated size (in bytes). */
1021 anonymous_size
= mbr
.at_byte_size
;
1025 /* The size of the anonymous object containing
1026 the bit field matches the size of an object
1027 of the bit field's type. DWARF allows
1028 at_byte_size to be left out in such cases, as
1029 a debug information size optimization. */
1030 anonymous_size
= TYPE_LENGTH (list
->field
.type
);
1032 FIELD_BITPOS (list
->field
) +=
1033 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
1039 process_dies (thisdie
, nextdie
, objfile
);
1044 /* Now create the vector of fields, and record how big it is. We may
1045 not even have any fields, if this DIE was generated due to a reference
1046 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1047 set, which clues gdb in to the fact that it needs to search elsewhere
1048 for the full structure definition. */
1051 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1055 TYPE_NFIELDS (type
) = nfields
;
1056 TYPE_FIELDS (type
) = (struct field
*)
1057 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1058 /* Copy the saved-up fields into the field vector. */
1059 for (n
= nfields
; list
; list
= list
->next
)
1061 TYPE_FIELD (type
, --n
) = list
->field
;
1071 read_structure_scope -- process all dies within struct or union
1075 static void read_structure_scope (struct dieinfo *dip,
1076 char *thisdie, char *enddie, struct objfile *objfile)
1080 Called when we find the DIE that starts a structure or union
1081 scope (definition) to process all dies that define the members
1082 of the structure or union. DIP is a pointer to the die info
1083 struct for the DIE that names the structure or union.
1087 Note that we need to call struct_type regardless of whether or not
1088 the DIE has an at_name attribute, since it might be an anonymous
1089 structure or union. This gets the type entered into our set of
1092 However, if the structure is incomplete (an opaque struct/union)
1093 then suppress creating a symbol table entry for it since gdb only
1094 wants to find the one with the complete definition. Note that if
1095 it is complete, we just call new_symbol, which does it's own
1096 checking about whether the struct/union is anonymous or not (and
1097 suppresses creating a symbol table entry itself).
1102 read_structure_scope (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
1103 struct objfile
*objfile
)
1108 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1109 if (!TYPE_STUB (type
))
1111 sym
= new_symbol (dip
, objfile
);
1114 SYMBOL_TYPE (sym
) = type
;
1115 if (cu_language
== language_cplus
)
1117 synthesize_typedef (dip
, objfile
, type
);
1127 decode_array_element_type -- decode type of the array elements
1131 static struct type *decode_array_element_type (char *scan, char *end)
1135 As the last step in decoding the array subscript information for an
1136 array DIE, we need to decode the type of the array elements. We are
1137 passed a pointer to this last part of the subscript information and
1138 must return the appropriate type. If the type attribute is not
1139 recognized, just warn about the problem and return type int.
1142 static struct type
*
1143 decode_array_element_type (char *scan
)
1147 unsigned short attribute
;
1148 unsigned short fundtype
;
1151 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1153 scan
+= SIZEOF_ATTRIBUTE
;
1154 nbytes
= attribute_size (attribute
);
1157 bad_array_element_type_complaint (DIE_ID
, DIE_NAME
, attribute
);
1158 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1165 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1167 typep
= decode_fund_type (fundtype
);
1169 case AT_mod_fund_type
:
1170 typep
= decode_mod_fund_type (scan
);
1172 case AT_user_def_type
:
1173 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1175 typep
= lookup_utype (die_ref
);
1178 typep
= alloc_utype (die_ref
, NULL
);
1181 case AT_mod_u_d_type
:
1182 typep
= decode_mod_u_d_type (scan
);
1185 bad_array_element_type_complaint (DIE_ID
, DIE_NAME
, attribute
);
1186 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1197 decode_subscript_data_item -- decode array subscript item
1201 static struct type *
1202 decode_subscript_data_item (char *scan, char *end)
1206 The array subscripts and the data type of the elements of an
1207 array are described by a list of data items, stored as a block
1208 of contiguous bytes. There is a data item describing each array
1209 dimension, and a final data item describing the element type.
1210 The data items are ordered the same as their appearance in the
1211 source (I.E. leftmost dimension first, next to leftmost second,
1214 The data items describing each array dimension consist of four
1215 parts: (1) a format specifier, (2) type type of the subscript
1216 index, (3) a description of the low bound of the array dimension,
1217 and (4) a description of the high bound of the array dimension.
1219 The last data item is the description of the type of each of
1222 We are passed a pointer to the start of the block of bytes
1223 containing the remaining data items, and a pointer to the first
1224 byte past the data. This function recursively decodes the
1225 remaining data items and returns a type.
1227 If we somehow fail to decode some data, we complain about it
1228 and return a type "array of int".
1231 FIXME: This code only implements the forms currently used
1232 by the AT&T and GNU C compilers.
1234 The end pointer is supplied for error checking, maybe we should
1238 static struct type
*
1239 decode_subscript_data_item (char *scan
, char *end
)
1241 struct type
*typep
= NULL
; /* Array type we are building */
1242 struct type
*nexttype
; /* Type of each element (may be array) */
1243 struct type
*indextype
; /* Type of this index */
1244 struct type
*rangetype
;
1245 unsigned int format
;
1246 unsigned short fundtype
;
1247 unsigned long lowbound
;
1248 unsigned long highbound
;
1251 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1253 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1257 typep
= decode_array_element_type (scan
);
1260 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1262 indextype
= decode_fund_type (fundtype
);
1263 scan
+= SIZEOF_FMT_FT
;
1264 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1265 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1267 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1269 nexttype
= decode_subscript_data_item (scan
, end
);
1270 if (nexttype
== NULL
)
1272 /* Munged subscript data or other problem, fake it. */
1273 complaint (&symfile_complaints
,
1274 "DIE @ 0x%x \"%s\", can't decode subscript data items",
1276 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1278 rangetype
= create_range_type ((struct type
*) NULL
, indextype
,
1279 lowbound
, highbound
);
1280 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1289 complaint (&symfile_complaints
,
1290 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet",
1291 DIE_ID
, DIE_NAME
, format
);
1292 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1293 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1294 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1297 complaint (&symfile_complaints
,
1298 "DIE @ 0x%x \"%s\", unknown array subscript format %x", DIE_ID
,
1300 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1301 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1302 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1312 dwarf_read_array_type -- read TAG_array_type DIE
1316 static void dwarf_read_array_type (struct dieinfo *dip)
1320 Extract all information from a TAG_array_type DIE and add to
1321 the user defined type vector.
1325 dwarf_read_array_type (struct dieinfo
*dip
)
1331 unsigned short blocksz
;
1334 if (dip
->at_ordering
!= ORD_row_major
)
1336 /* FIXME: Can gdb even handle column major arrays? */
1337 complaint (&symfile_complaints
,
1338 "DIE @ 0x%x \"%s\", array not row major; not handled correctly",
1341 sub
= dip
->at_subscr_data
;
1344 nbytes
= attribute_size (AT_subscr_data
);
1345 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1346 subend
= sub
+ nbytes
+ blocksz
;
1348 type
= decode_subscript_data_item (sub
, subend
);
1349 utype
= lookup_utype (dip
->die_ref
);
1352 /* Install user defined type that has not been referenced yet. */
1353 alloc_utype (dip
->die_ref
, type
);
1355 else if (TYPE_CODE (utype
) == TYPE_CODE_UNDEF
)
1357 /* Ick! A forward ref has already generated a blank type in our
1358 slot, and this type probably already has things pointing to it
1359 (which is what caused it to be created in the first place).
1360 If it's just a place holder we can plop our fully defined type
1361 on top of it. We can't recover the space allocated for our
1362 new type since it might be on an obstack, but we could reuse
1363 it if we kept a list of them, but it might not be worth it
1369 /* Double ick! Not only is a type already in our slot, but
1370 someone has decorated it. Complain and leave it alone. */
1371 dup_user_type_definition_complaint (DIE_ID
, DIE_NAME
);
1380 read_tag_pointer_type -- read TAG_pointer_type DIE
1384 static void read_tag_pointer_type (struct dieinfo *dip)
1388 Extract all information from a TAG_pointer_type DIE and add to
1389 the user defined type vector.
1393 read_tag_pointer_type (struct dieinfo
*dip
)
1398 type
= decode_die_type (dip
);
1399 utype
= lookup_utype (dip
->die_ref
);
1402 utype
= lookup_pointer_type (type
);
1403 alloc_utype (dip
->die_ref
, utype
);
1407 TYPE_TARGET_TYPE (utype
) = type
;
1408 TYPE_POINTER_TYPE (type
) = utype
;
1410 /* We assume the machine has only one representation for pointers! */
1411 /* FIXME: Possably a poor assumption */
1412 TYPE_LENGTH (utype
) = TARGET_PTR_BIT
/ TARGET_CHAR_BIT
;
1413 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1421 read_tag_string_type -- read TAG_string_type DIE
1425 static void read_tag_string_type (struct dieinfo *dip)
1429 Extract all information from a TAG_string_type DIE and add to
1430 the user defined type vector. It isn't really a user defined
1431 type, but it behaves like one, with other DIE's using an
1432 AT_user_def_type attribute to reference it.
1436 read_tag_string_type (struct dieinfo
*dip
)
1439 struct type
*indextype
;
1440 struct type
*rangetype
;
1441 unsigned long lowbound
= 0;
1442 unsigned long highbound
;
1444 if (dip
->has_at_byte_size
)
1446 /* A fixed bounds string */
1447 highbound
= dip
->at_byte_size
- 1;
1451 /* A varying length string. Stub for now. (FIXME) */
1454 indextype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1455 rangetype
= create_range_type ((struct type
*) NULL
, indextype
, lowbound
,
1458 utype
= lookup_utype (dip
->die_ref
);
1461 /* No type defined, go ahead and create a blank one to use. */
1462 utype
= alloc_utype (dip
->die_ref
, (struct type
*) NULL
);
1466 /* Already a type in our slot due to a forward reference. Make sure it
1467 is a blank one. If not, complain and leave it alone. */
1468 if (TYPE_CODE (utype
) != TYPE_CODE_UNDEF
)
1470 dup_user_type_definition_complaint (DIE_ID
, DIE_NAME
);
1475 /* Create the string type using the blank type we either found or created. */
1476 utype
= create_string_type (utype
, rangetype
);
1483 read_subroutine_type -- process TAG_subroutine_type dies
1487 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1492 Handle DIES due to C code like:
1495 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1501 The parameter DIES are currently ignored. See if gdb has a way to
1502 include this info in it's type system, and decode them if so. Is
1503 this what the type structure's "arg_types" field is for? (FIXME)
1507 read_subroutine_type (struct dieinfo
*dip
, char *thisdie
, char *enddie
)
1509 struct type
*type
; /* Type that this function returns */
1510 struct type
*ftype
; /* Function that returns above type */
1512 /* Decode the type that this subroutine returns */
1514 type
= decode_die_type (dip
);
1516 /* Check to see if we already have a partially constructed user
1517 defined type for this DIE, from a forward reference. */
1519 ftype
= lookup_utype (dip
->die_ref
);
1522 /* This is the first reference to one of these types. Make
1523 a new one and place it in the user defined types. */
1524 ftype
= lookup_function_type (type
);
1525 alloc_utype (dip
->die_ref
, ftype
);
1527 else if (TYPE_CODE (ftype
) == TYPE_CODE_UNDEF
)
1529 /* We have an existing partially constructed type, so bash it
1530 into the correct type. */
1531 TYPE_TARGET_TYPE (ftype
) = type
;
1532 TYPE_LENGTH (ftype
) = 1;
1533 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1537 dup_user_type_definition_complaint (DIE_ID
, DIE_NAME
);
1545 read_enumeration -- process dies which define an enumeration
1549 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1550 char *enddie, struct objfile *objfile)
1554 Given a pointer to a die which begins an enumeration, process all
1555 the dies that define the members of the enumeration.
1559 Note that we need to call enum_type regardless of whether or not we
1560 have a symbol, since we might have an enum without a tag name (thus
1561 no symbol for the tagname).
1565 read_enumeration (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
1566 struct objfile
*objfile
)
1571 type
= enum_type (dip
, objfile
);
1572 sym
= new_symbol (dip
, objfile
);
1575 SYMBOL_TYPE (sym
) = type
;
1576 if (cu_language
== language_cplus
)
1578 synthesize_typedef (dip
, objfile
, type
);
1587 enum_type -- decode and return a type for an enumeration
1591 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1595 Given a pointer to a die information structure for the die which
1596 starts an enumeration, process all the dies that define the members
1597 of the enumeration and return a type pointer for the enumeration.
1599 At the same time, for each member of the enumeration, create a
1600 symbol for it with domain VAR_DOMAIN and class LOC_CONST,
1601 and give it the type of the enumeration itself.
1605 Note that the DWARF specification explicitly mandates that enum
1606 constants occur in reverse order from the source program order,
1607 for "consistency" and because this ordering is easier for many
1608 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1609 Entries). Because gdb wants to see the enum members in program
1610 source order, we have to ensure that the order gets reversed while
1611 we are processing them.
1614 static struct type
*
1615 enum_type (struct dieinfo
*dip
, struct objfile
*objfile
)
1620 struct nextfield
*next
;
1623 struct nextfield
*list
= NULL
;
1624 struct nextfield
*new;
1629 unsigned short blocksz
;
1632 int unsigned_enum
= 1;
1634 type
= lookup_utype (dip
->die_ref
);
1637 /* No forward references created an empty type, so install one now */
1638 type
= alloc_utype (dip
->die_ref
, NULL
);
1640 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1641 /* Some compilers try to be helpful by inventing "fake" names for
1642 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1643 Thanks, but no thanks... */
1644 if (dip
->at_name
!= NULL
1645 && *dip
->at_name
!= '~'
1646 && *dip
->at_name
!= '.')
1648 TYPE_TAG_NAME (type
) = obconcat (&objfile
->type_obstack
,
1649 "", "", dip
->at_name
);
1651 if (dip
->at_byte_size
!= 0)
1653 TYPE_LENGTH (type
) = dip
->at_byte_size
;
1655 scan
= dip
->at_element_list
;
1658 if (dip
->short_element_list
)
1660 nbytes
= attribute_size (AT_short_element_list
);
1664 nbytes
= attribute_size (AT_element_list
);
1666 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1667 listend
= scan
+ nbytes
+ blocksz
;
1669 while (scan
< listend
)
1671 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1674 FIELD_TYPE (list
->field
) = NULL
;
1675 FIELD_BITSIZE (list
->field
) = 0;
1676 FIELD_STATIC_KIND (list
->field
) = 0;
1677 FIELD_BITPOS (list
->field
) =
1678 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1680 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1681 list
->field
.name
= obsavestring (scan
, strlen (scan
),
1682 &objfile
->type_obstack
);
1683 scan
+= strlen (scan
) + 1;
1685 /* Handcraft a new symbol for this enum member. */
1686 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1687 sizeof (struct symbol
));
1688 memset (sym
, 0, sizeof (struct symbol
));
1689 DEPRECATED_SYMBOL_NAME (sym
) = create_name (list
->field
.name
,
1690 &objfile
->symbol_obstack
);
1691 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
1692 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
1693 SYMBOL_CLASS (sym
) = LOC_CONST
;
1694 SYMBOL_TYPE (sym
) = type
;
1695 SYMBOL_VALUE (sym
) = FIELD_BITPOS (list
->field
);
1696 if (SYMBOL_VALUE (sym
) < 0)
1698 add_symbol_to_list (sym
, list_in_scope
);
1700 /* Now create the vector of fields, and record how big it is. This is
1701 where we reverse the order, by pulling the members off the list in
1702 reverse order from how they were inserted. If we have no fields
1703 (this is apparently possible in C++) then skip building a field
1708 TYPE_FLAGS (type
) |= TYPE_FLAG_UNSIGNED
;
1709 TYPE_NFIELDS (type
) = nfields
;
1710 TYPE_FIELDS (type
) = (struct field
*)
1711 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1712 /* Copy the saved-up fields into the field vector. */
1713 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
->next
)
1715 TYPE_FIELD (type
, n
++) = list
->field
;
1726 read_func_scope -- process all dies within a function scope
1730 Process all dies within a given function scope. We are passed
1731 a die information structure pointer DIP for the die which
1732 starts the function scope, and pointers into the raw die data
1733 that define the dies within the function scope.
1735 For now, we ignore lexical block scopes within the function.
1736 The problem is that AT&T cc does not define a DWARF lexical
1737 block scope for the function itself, while gcc defines a
1738 lexical block scope for the function. We need to think about
1739 how to handle this difference, or if it is even a problem.
1744 read_func_scope (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
1745 struct objfile
*objfile
)
1747 struct context_stack
*new;
1749 /* AT_name is absent if the function is described with an
1750 AT_abstract_origin tag.
1751 Ignore the function description for now to avoid GDB core dumps.
1752 FIXME: Add code to handle AT_abstract_origin tags properly. */
1753 if (dip
->at_name
== NULL
)
1755 complaint (&symfile_complaints
, "DIE @ 0x%x, AT_name tag missing",
1760 if (objfile
->ei
.entry_point
>= dip
->at_low_pc
&&
1761 objfile
->ei
.entry_point
< dip
->at_high_pc
)
1763 objfile
->ei
.entry_func_lowpc
= dip
->at_low_pc
;
1764 objfile
->ei
.entry_func_highpc
= dip
->at_high_pc
;
1766 new = push_context (0, dip
->at_low_pc
);
1767 new->name
= new_symbol (dip
, objfile
);
1768 list_in_scope
= &local_symbols
;
1769 process_dies (thisdie
+ dip
->die_length
, enddie
, objfile
);
1770 new = pop_context ();
1771 /* Make a block for the local symbols within. */
1772 finish_block (new->name
, &local_symbols
, new->old_blocks
,
1773 new->start_addr
, dip
->at_high_pc
, objfile
);
1774 list_in_scope
= &file_symbols
;
1782 handle_producer -- process the AT_producer attribute
1786 Perform any operations that depend on finding a particular
1787 AT_producer attribute.
1792 handle_producer (char *producer
)
1795 /* If this compilation unit was compiled with g++ or gcc, then set the
1796 processing_gcc_compilation flag. */
1798 if (STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
)))
1800 char version
= producer
[strlen (GCC_PRODUCER
)];
1801 processing_gcc_compilation
= (version
== '2' ? 2 : 1);
1805 processing_gcc_compilation
=
1806 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
));
1809 /* Select a demangling style if we can identify the producer and if
1810 the current style is auto. We leave the current style alone if it
1811 is not auto. We also leave the demangling style alone if we find a
1812 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1814 if (AUTO_DEMANGLING
)
1816 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1819 /* For now, stay with AUTO_DEMANGLING for g++ output, as we don't
1820 know whether it will use the old style or v3 mangling. */
1821 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1824 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1826 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1836 read_file_scope -- process all dies within a file scope
1840 Process all dies within a given file scope. We are passed a
1841 pointer to the die information structure for the die which
1842 starts the file scope, and pointers into the raw die data which
1843 mark the range of dies within the file scope.
1845 When the partial symbol table is built, the file offset for the line
1846 number table for each compilation unit is saved in the partial symbol
1847 table entry for that compilation unit. As the symbols for each
1848 compilation unit are read, the line number table is read into memory
1849 and the variable lnbase is set to point to it. Thus all we have to
1850 do is use lnbase to access the line number table for the current
1855 read_file_scope (struct dieinfo
*dip
, char *thisdie
, char *enddie
,
1856 struct objfile
*objfile
)
1858 struct cleanup
*back_to
;
1859 struct symtab
*symtab
;
1861 if (objfile
->ei
.entry_point
>= dip
->at_low_pc
&&
1862 objfile
->ei
.entry_point
< dip
->at_high_pc
)
1864 objfile
->ei
.entry_file_lowpc
= dip
->at_low_pc
;
1865 objfile
->ei
.entry_file_highpc
= dip
->at_high_pc
;
1867 set_cu_language (dip
);
1868 if (dip
->at_producer
!= NULL
)
1870 handle_producer (dip
->at_producer
);
1872 numutypes
= (enddie
- thisdie
) / 4;
1873 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1874 back_to
= make_cleanup (free_utypes
, NULL
);
1875 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1876 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1877 start_symtab (dip
->at_name
, dip
->at_comp_dir
, dip
->at_low_pc
);
1878 record_debugformat ("DWARF 1");
1879 decode_line_numbers (lnbase
);
1880 process_dies (thisdie
+ dip
->die_length
, enddie
, objfile
);
1882 symtab
= end_symtab (dip
->at_high_pc
, objfile
, 0);
1885 symtab
->language
= cu_language
;
1887 do_cleanups (back_to
);
1894 process_dies -- process a range of DWARF Information Entries
1898 static void process_dies (char *thisdie, char *enddie,
1899 struct objfile *objfile)
1903 Process all DIE's in a specified range. May be (and almost
1904 certainly will be) called recursively.
1908 process_dies (char *thisdie
, char *enddie
, struct objfile
*objfile
)
1913 while (thisdie
< enddie
)
1915 basicdieinfo (&di
, thisdie
, objfile
);
1916 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1920 else if (di
.die_tag
== TAG_padding
)
1922 nextdie
= thisdie
+ di
.die_length
;
1926 completedieinfo (&di
, objfile
);
1927 if (di
.at_sibling
!= 0)
1929 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1933 nextdie
= thisdie
+ di
.die_length
;
1935 /* I think that these are always text, not data, addresses. */
1936 di
.at_low_pc
= SMASH_TEXT_ADDRESS (di
.at_low_pc
);
1937 di
.at_high_pc
= SMASH_TEXT_ADDRESS (di
.at_high_pc
);
1940 case TAG_compile_unit
:
1941 /* Skip Tag_compile_unit if we are already inside a compilation
1942 unit, we are unable to handle nested compilation units
1943 properly (FIXME). */
1944 if (current_subfile
== NULL
)
1945 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
1947 nextdie
= thisdie
+ di
.die_length
;
1949 case TAG_global_subroutine
:
1950 case TAG_subroutine
:
1951 if (di
.has_at_low_pc
)
1953 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
1956 case TAG_lexical_block
:
1957 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
1959 case TAG_class_type
:
1960 case TAG_structure_type
:
1961 case TAG_union_type
:
1962 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
1964 case TAG_enumeration_type
:
1965 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
1967 case TAG_subroutine_type
:
1968 read_subroutine_type (&di
, thisdie
, nextdie
);
1970 case TAG_array_type
:
1971 dwarf_read_array_type (&di
);
1973 case TAG_pointer_type
:
1974 read_tag_pointer_type (&di
);
1976 case TAG_string_type
:
1977 read_tag_string_type (&di
);
1980 new_symbol (&di
, objfile
);
1992 decode_line_numbers -- decode a line number table fragment
1996 static void decode_line_numbers (char *tblscan, char *tblend,
1997 long length, long base, long line, long pc)
2001 Translate the DWARF line number information to gdb form.
2003 The ".line" section contains one or more line number tables, one for
2004 each ".line" section from the objects that were linked.
2006 The AT_stmt_list attribute for each TAG_source_file entry in the
2007 ".debug" section contains the offset into the ".line" section for the
2008 start of the table for that file.
2010 The table itself has the following structure:
2012 <table length><base address><source statement entry>
2013 4 bytes 4 bytes 10 bytes
2015 The table length is the total size of the table, including the 4 bytes
2016 for the length information.
2018 The base address is the address of the first instruction generated
2019 for the source file.
2021 Each source statement entry has the following structure:
2023 <line number><statement position><address delta>
2024 4 bytes 2 bytes 4 bytes
2026 The line number is relative to the start of the file, starting with
2029 The statement position either -1 (0xFFFF) or the number of characters
2030 from the beginning of the line to the beginning of the statement.
2032 The address delta is the difference between the base address and
2033 the address of the first instruction for the statement.
2035 Note that we must copy the bytes from the packed table to our local
2036 variables before attempting to use them, to avoid alignment problems
2037 on some machines, particularly RISC processors.
2041 Does gdb expect the line numbers to be sorted? They are now by
2042 chance/luck, but are not required to be. (FIXME)
2044 The line with number 0 is unused, gdb apparently can discover the
2045 span of the last line some other way. How? (FIXME)
2049 decode_line_numbers (char *linetable
)
2053 unsigned long length
;
2058 if (linetable
!= NULL
)
2060 tblscan
= tblend
= linetable
;
2061 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2063 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2065 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2066 GET_UNSIGNED
, current_objfile
);
2067 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2069 while (tblscan
< tblend
)
2071 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2073 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2074 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2076 tblscan
+= SIZEOF_LINETBL_DELTA
;
2080 record_line (current_subfile
, line
, pc
);
2090 locval -- compute the value of a location attribute
2094 static int locval (struct dieinfo *dip)
2098 Given pointer to a string of bytes that define a location, compute
2099 the location and return the value.
2100 A location description containing no atoms indicates that the
2101 object is optimized out. The optimized_out flag is set for those,
2102 the return value is meaningless.
2104 When computing values involving the current value of the frame pointer,
2105 the value zero is used, which results in a value relative to the frame
2106 pointer, rather than the absolute value. This is what GDB wants
2109 When the result is a register number, the isreg flag is set, otherwise
2110 it is cleared. This is a kludge until we figure out a better
2111 way to handle the problem. Gdb's design does not mesh well with the
2112 DWARF notion of a location computing interpreter, which is a shame
2113 because the flexibility goes unused.
2117 Note that stack[0] is unused except as a default error return.
2118 Note that stack overflow is not yet handled.
2122 locval (struct dieinfo
*dip
)
2124 unsigned short nbytes
;
2125 unsigned short locsize
;
2126 auto long stack
[64];
2133 loc
= dip
->at_location
;
2134 nbytes
= attribute_size (AT_location
);
2135 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2137 end
= loc
+ locsize
;
2142 dip
->optimized_out
= 1;
2143 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2146 dip
->optimized_out
= 0;
2147 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2149 loc
+= SIZEOF_LOC_ATOM_CODE
;
2150 switch (loc_atom_code
)
2157 /* push register (number) */
2159 = DWARF_REG_TO_REGNUM (target_to_host (loc
, loc_value_size
,
2162 loc
+= loc_value_size
;
2166 /* push value of register (number) */
2167 /* Actually, we compute the value as if register has 0, so the
2168 value ends up being the offset from that register. */
2170 dip
->basereg
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2172 loc
+= loc_value_size
;
2173 stack
[++stacki
] = 0;
2176 /* push address (relocated address) */
2177 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2178 GET_UNSIGNED
, current_objfile
);
2179 loc
+= loc_value_size
;
2182 /* push constant (number) FIXME: signed or unsigned! */
2183 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2184 GET_SIGNED
, current_objfile
);
2185 loc
+= loc_value_size
;
2188 /* pop, deref and push 2 bytes (as a long) */
2189 complaint (&symfile_complaints
,
2190 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%lx not handled",
2191 DIE_ID
, DIE_NAME
, stack
[stacki
]);
2193 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2194 complaint (&symfile_complaints
,
2195 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%lx not handled",
2196 DIE_ID
, DIE_NAME
, stack
[stacki
]);
2198 case OP_ADD
: /* pop top 2 items, add, push result */
2199 stack
[stacki
- 1] += stack
[stacki
];
2204 return (stack
[stacki
]);
2211 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2215 static void read_ofile_symtab (struct partial_symtab *pst)
2219 When expanding a partial symbol table entry to a full symbol table
2220 entry, this is the function that gets called to read in the symbols
2221 for the compilation unit. A pointer to the newly constructed symtab,
2222 which is now the new first one on the objfile's symtab list, is
2223 stashed in the partial symbol table entry.
2227 read_ofile_symtab (struct partial_symtab
*pst
)
2229 struct cleanup
*back_to
;
2230 unsigned long lnsize
;
2233 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2235 abfd
= pst
->objfile
->obfd
;
2236 current_objfile
= pst
->objfile
;
2238 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2239 unit, seek to the location in the file, and read in all the DIE's. */
2242 dbsize
= DBLENGTH (pst
);
2243 dbbase
= xmalloc (dbsize
);
2244 dbroff
= DBROFF (pst
);
2245 foffset
= DBFOFF (pst
) + dbroff
;
2246 base_section_offsets
= pst
->section_offsets
;
2247 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2248 if (bfd_seek (abfd
, foffset
, SEEK_SET
) ||
2249 (bfd_bread (dbbase
, dbsize
, abfd
) != dbsize
))
2252 error ("can't read DWARF data");
2254 back_to
= make_cleanup (xfree
, dbbase
);
2256 /* If there is a line number table associated with this compilation unit
2257 then read the size of this fragment in bytes, from the fragment itself.
2258 Allocate a buffer for the fragment and read it in for future
2264 if (bfd_seek (abfd
, LNFOFF (pst
), SEEK_SET
) ||
2265 (bfd_bread (lnsizedata
, sizeof (lnsizedata
), abfd
)
2266 != sizeof (lnsizedata
)))
2268 error ("can't read DWARF line number table size");
2270 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2271 GET_UNSIGNED
, pst
->objfile
);
2272 lnbase
= xmalloc (lnsize
);
2273 if (bfd_seek (abfd
, LNFOFF (pst
), SEEK_SET
) ||
2274 (bfd_bread (lnbase
, lnsize
, abfd
) != lnsize
))
2277 error ("can't read DWARF line numbers");
2279 make_cleanup (xfree
, lnbase
);
2282 process_dies (dbbase
, dbbase
+ dbsize
, pst
->objfile
);
2283 do_cleanups (back_to
);
2284 current_objfile
= NULL
;
2285 pst
->symtab
= pst
->objfile
->symtabs
;
2292 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2296 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2300 Called once for each partial symbol table entry that needs to be
2301 expanded into a full symbol table entry.
2306 psymtab_to_symtab_1 (struct partial_symtab
*pst
)
2309 struct cleanup
*old_chain
;
2315 warning ("psymtab for %s already read in. Shouldn't happen.",
2320 /* Read in all partial symtabs on which this one is dependent */
2321 for (i
= 0; i
< pst
->number_of_dependencies
; i
++)
2323 if (!pst
->dependencies
[i
]->readin
)
2325 /* Inform about additional files that need to be read in. */
2328 fputs_filtered (" ", gdb_stdout
);
2330 fputs_filtered ("and ", gdb_stdout
);
2332 printf_filtered ("%s...",
2333 pst
->dependencies
[i
]->filename
);
2335 gdb_flush (gdb_stdout
); /* Flush output */
2337 psymtab_to_symtab_1 (pst
->dependencies
[i
]);
2340 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2343 old_chain
= make_cleanup (really_free_pendings
, 0);
2344 read_ofile_symtab (pst
);
2347 printf_filtered ("%d DIE's, sorting...", diecount
);
2349 gdb_flush (gdb_stdout
);
2351 do_cleanups (old_chain
);
2362 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2366 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2370 This is the DWARF support entry point for building a full symbol
2371 table entry from a partial symbol table entry. We are passed a
2372 pointer to the partial symbol table entry that needs to be expanded.
2377 dwarf_psymtab_to_symtab (struct partial_symtab
*pst
)
2384 warning ("psymtab for %s already read in. Shouldn't happen.",
2389 if (DBLENGTH (pst
) || pst
->number_of_dependencies
)
2391 /* Print the message now, before starting serious work, to avoid
2392 disconcerting pauses. */
2395 printf_filtered ("Reading in symbols for %s...",
2397 gdb_flush (gdb_stdout
);
2400 psymtab_to_symtab_1 (pst
);
2402 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2403 we need to do an equivalent or is this something peculiar to
2405 Match with global symbols. This only needs to be done once,
2406 after all of the symtabs and dependencies have been read in.
2408 scan_file_globals (pst
->objfile
);
2411 /* Finish up the verbose info message. */
2414 printf_filtered ("done.\n");
2415 gdb_flush (gdb_stdout
);
2426 add_enum_psymbol -- add enumeration members to partial symbol table
2430 Given pointer to a DIE that is known to be for an enumeration,
2431 extract the symbolic names of the enumeration members and add
2432 partial symbols for them.
2436 add_enum_psymbol (struct dieinfo
*dip
, struct objfile
*objfile
)
2440 unsigned short blocksz
;
2443 scan
= dip
->at_element_list
;
2446 if (dip
->short_element_list
)
2448 nbytes
= attribute_size (AT_short_element_list
);
2452 nbytes
= attribute_size (AT_element_list
);
2454 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2456 listend
= scan
+ blocksz
;
2457 while (scan
< listend
)
2459 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2460 add_psymbol_to_list (scan
, strlen (scan
), VAR_DOMAIN
, LOC_CONST
,
2461 &objfile
->static_psymbols
, 0, 0, cu_language
,
2463 scan
+= strlen (scan
) + 1;
2472 add_partial_symbol -- add symbol to partial symbol table
2476 Given a DIE, if it is one of the types that we want to
2477 add to a partial symbol table, finish filling in the die info
2478 and then add a partial symbol table entry for it.
2482 The caller must ensure that the DIE has a valid name attribute.
2486 add_partial_symbol (struct dieinfo
*dip
, struct objfile
*objfile
)
2488 switch (dip
->die_tag
)
2490 case TAG_global_subroutine
:
2491 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2492 VAR_DOMAIN
, LOC_BLOCK
,
2493 &objfile
->global_psymbols
,
2494 0, dip
->at_low_pc
, cu_language
, objfile
);
2496 case TAG_global_variable
:
2497 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2498 VAR_DOMAIN
, LOC_STATIC
,
2499 &objfile
->global_psymbols
,
2500 0, 0, cu_language
, objfile
);
2502 case TAG_subroutine
:
2503 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2504 VAR_DOMAIN
, LOC_BLOCK
,
2505 &objfile
->static_psymbols
,
2506 0, dip
->at_low_pc
, cu_language
, objfile
);
2508 case TAG_local_variable
:
2509 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2510 VAR_DOMAIN
, LOC_STATIC
,
2511 &objfile
->static_psymbols
,
2512 0, 0, cu_language
, objfile
);
2515 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2516 VAR_DOMAIN
, LOC_TYPEDEF
,
2517 &objfile
->static_psymbols
,
2518 0, 0, cu_language
, objfile
);
2520 case TAG_class_type
:
2521 case TAG_structure_type
:
2522 case TAG_union_type
:
2523 case TAG_enumeration_type
:
2524 /* Do not add opaque aggregate definitions to the psymtab. */
2525 if (!dip
->has_at_byte_size
)
2527 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2528 STRUCT_DOMAIN
, LOC_TYPEDEF
,
2529 &objfile
->static_psymbols
,
2530 0, 0, cu_language
, objfile
);
2531 if (cu_language
== language_cplus
)
2533 /* For C++, these implicitly act as typedefs as well. */
2534 add_psymbol_to_list (dip
->at_name
, strlen (dip
->at_name
),
2535 VAR_DOMAIN
, LOC_TYPEDEF
,
2536 &objfile
->static_psymbols
,
2537 0, 0, cu_language
, objfile
);
2547 scan_partial_symbols -- scan DIE's within a single compilation unit
2551 Process the DIE's within a single compilation unit, looking for
2552 interesting DIE's that contribute to the partial symbol table entry
2553 for this compilation unit.
2557 There are some DIE's that may appear both at file scope and within
2558 the scope of a function. We are only interested in the ones at file
2559 scope, and the only way to tell them apart is to keep track of the
2560 scope. For example, consider the test case:
2565 for which the relevant DWARF segment has the structure:
2568 0x23 global subrtn sibling 0x9b
2570 fund_type FT_integer
2575 0x23 local var sibling 0x97
2577 fund_type FT_integer
2578 location OP_BASEREG 0xe
2585 0x1d local var sibling 0xb8
2587 fund_type FT_integer
2588 location OP_ADDR 0x800025dc
2593 We want to include the symbol 'i' in the partial symbol table, but
2594 not the symbol 'j'. In essence, we want to skip all the dies within
2595 the scope of a TAG_global_subroutine DIE.
2597 Don't attempt to add anonymous structures or unions since they have
2598 no name. Anonymous enumerations however are processed, because we
2599 want to extract their member names (the check for a tag name is
2602 Also, for variables and subroutines, check that this is the place
2603 where the actual definition occurs, rather than just a reference
2611 scan_partial_symbols (char *thisdie
, char *enddie
, struct objfile
*objfile
)
2617 while (thisdie
< enddie
)
2619 basicdieinfo (&di
, thisdie
, objfile
);
2620 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2626 nextdie
= thisdie
+ di
.die_length
;
2627 /* To avoid getting complete die information for every die, we
2628 only do it (below) for the cases we are interested in. */
2631 case TAG_global_subroutine
:
2632 case TAG_subroutine
:
2633 completedieinfo (&di
, objfile
);
2634 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2636 add_partial_symbol (&di
, objfile
);
2637 /* If there is a sibling attribute, adjust the nextdie
2638 pointer to skip the entire scope of the subroutine.
2639 Apply some sanity checking to make sure we don't
2640 overrun or underrun the range of remaining DIE's */
2641 if (di
.at_sibling
!= 0)
2643 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2644 if ((temp
< thisdie
) || (temp
>= enddie
))
2646 bad_die_ref_complaint (DIE_ID
, DIE_NAME
,
2656 case TAG_global_variable
:
2657 case TAG_local_variable
:
2658 completedieinfo (&di
, objfile
);
2659 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2661 add_partial_symbol (&di
, objfile
);
2665 case TAG_class_type
:
2666 case TAG_structure_type
:
2667 case TAG_union_type
:
2668 completedieinfo (&di
, objfile
);
2671 add_partial_symbol (&di
, objfile
);
2674 case TAG_enumeration_type
:
2675 completedieinfo (&di
, objfile
);
2678 add_partial_symbol (&di
, objfile
);
2680 add_enum_psymbol (&di
, objfile
);
2692 scan_compilation_units -- build a psymtab entry for each compilation
2696 This is the top level dwarf parsing routine for building partial
2699 It scans from the beginning of the DWARF table looking for the first
2700 TAG_compile_unit DIE, and then follows the sibling chain to locate
2701 each additional TAG_compile_unit DIE.
2703 For each TAG_compile_unit DIE it creates a partial symtab structure,
2704 calls a subordinate routine to collect all the compilation unit's
2705 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2706 new partial symtab structure into the partial symbol table. It also
2707 records the appropriate information in the partial symbol table entry
2708 to allow the chunk of DIE's and line number table for this compilation
2709 unit to be located and re-read later, to generate a complete symbol
2710 table entry for the compilation unit.
2712 Thus it effectively partitions up a chunk of DIE's for multiple
2713 compilation units into smaller DIE chunks and line number tables,
2714 and associates them with a partial symbol table entry.
2718 If any compilation unit has no line number table associated with
2719 it for some reason (a missing at_stmt_list attribute, rather than
2720 just one with a value of zero, which is valid) then we ensure that
2721 the recorded file offset is zero so that the routine which later
2722 reads line number table fragments knows that there is no fragment
2732 scan_compilation_units (char *thisdie
, char *enddie
, file_ptr dbfoff
,
2733 file_ptr lnoffset
, struct objfile
*objfile
)
2737 struct partial_symtab
*pst
;
2740 file_ptr curlnoffset
;
2742 while (thisdie
< enddie
)
2744 basicdieinfo (&di
, thisdie
, objfile
);
2745 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2749 else if (di
.die_tag
!= TAG_compile_unit
)
2751 nextdie
= thisdie
+ di
.die_length
;
2755 completedieinfo (&di
, objfile
);
2756 set_cu_language (&di
);
2757 if (di
.at_sibling
!= 0)
2759 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2763 nextdie
= thisdie
+ di
.die_length
;
2765 curoff
= thisdie
- dbbase
;
2766 culength
= nextdie
- thisdie
;
2767 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2769 /* First allocate a new partial symbol table structure */
2771 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2772 di
.at_name
, di
.at_low_pc
,
2773 objfile
->global_psymbols
.next
,
2774 objfile
->static_psymbols
.next
);
2776 pst
->texthigh
= di
.at_high_pc
;
2777 pst
->read_symtab_private
= (char *)
2778 obstack_alloc (&objfile
->psymbol_obstack
,
2779 sizeof (struct dwfinfo
));
2780 DBFOFF (pst
) = dbfoff
;
2781 DBROFF (pst
) = curoff
;
2782 DBLENGTH (pst
) = culength
;
2783 LNFOFF (pst
) = curlnoffset
;
2784 pst
->read_symtab
= dwarf_psymtab_to_symtab
;
2786 /* Now look for partial symbols */
2788 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2790 pst
->n_global_syms
= objfile
->global_psymbols
.next
-
2791 (objfile
->global_psymbols
.list
+ pst
->globals_offset
);
2792 pst
->n_static_syms
= objfile
->static_psymbols
.next
-
2793 (objfile
->static_psymbols
.list
+ pst
->statics_offset
);
2794 sort_pst_symbols (pst
);
2795 /* If there is already a psymtab or symtab for a file of this name,
2796 remove it. (If there is a symtab, more drastic things also
2797 happen.) This happens in VxWorks. */
2798 free_named_symtabs (pst
->filename
);
2808 new_symbol -- make a symbol table entry for a new symbol
2812 static struct symbol *new_symbol (struct dieinfo *dip,
2813 struct objfile *objfile)
2817 Given a pointer to a DWARF information entry, figure out if we need
2818 to make a symbol table entry for it, and if so, create a new entry
2819 and return a pointer to it.
2822 static struct symbol
*
2823 new_symbol (struct dieinfo
*dip
, struct objfile
*objfile
)
2825 struct symbol
*sym
= NULL
;
2827 if (dip
->at_name
!= NULL
)
2829 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
2830 sizeof (struct symbol
));
2831 OBJSTAT (objfile
, n_syms
++);
2832 memset (sym
, 0, sizeof (struct symbol
));
2833 /* default assumptions */
2834 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
2835 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2836 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2838 /* If this symbol is from a C++ compilation, then attempt to cache the
2839 demangled form for future reference. This is a typical time versus
2840 space tradeoff, that was decided in favor of time because it sped up
2841 C++ symbol lookups by a factor of about 20. */
2843 SYMBOL_LANGUAGE (sym
) = cu_language
;
2844 SYMBOL_SET_NAMES (sym
, dip
->at_name
, strlen (dip
->at_name
), objfile
);
2845 switch (dip
->die_tag
)
2848 SYMBOL_VALUE_ADDRESS (sym
) = dip
->at_low_pc
;
2849 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2851 case TAG_global_subroutine
:
2852 case TAG_subroutine
:
2853 SYMBOL_VALUE_ADDRESS (sym
) = dip
->at_low_pc
;
2854 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2855 if (dip
->at_prototyped
)
2856 TYPE_FLAGS (SYMBOL_TYPE (sym
)) |= TYPE_FLAG_PROTOTYPED
;
2857 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2858 if (dip
->die_tag
== TAG_global_subroutine
)
2860 add_symbol_to_list (sym
, &global_symbols
);
2864 add_symbol_to_list (sym
, list_in_scope
);
2867 case TAG_global_variable
:
2868 if (dip
->at_location
!= NULL
)
2870 SYMBOL_VALUE_ADDRESS (sym
) = locval (dip
);
2871 add_symbol_to_list (sym
, &global_symbols
);
2872 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2873 SYMBOL_VALUE (sym
) += baseaddr
;
2876 case TAG_local_variable
:
2877 if (dip
->at_location
!= NULL
)
2879 int loc
= locval (dip
);
2880 if (dip
->optimized_out
)
2882 SYMBOL_CLASS (sym
) = LOC_OPTIMIZED_OUT
;
2884 else if (dip
->isreg
)
2886 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2888 else if (dip
->offreg
)
2890 SYMBOL_CLASS (sym
) = LOC_BASEREG
;
2891 SYMBOL_BASEREG (sym
) = dip
->basereg
;
2895 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2896 SYMBOL_VALUE (sym
) += baseaddr
;
2898 if (SYMBOL_CLASS (sym
) == LOC_STATIC
)
2900 /* LOC_STATIC address class MUST use SYMBOL_VALUE_ADDRESS,
2901 which may store to a bigger location than SYMBOL_VALUE. */
2902 SYMBOL_VALUE_ADDRESS (sym
) = loc
;
2906 SYMBOL_VALUE (sym
) = loc
;
2908 add_symbol_to_list (sym
, list_in_scope
);
2911 case TAG_formal_parameter
:
2912 if (dip
->at_location
!= NULL
)
2914 SYMBOL_VALUE (sym
) = locval (dip
);
2916 add_symbol_to_list (sym
, list_in_scope
);
2919 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
2921 else if (dip
->offreg
)
2923 SYMBOL_CLASS (sym
) = LOC_BASEREG_ARG
;
2924 SYMBOL_BASEREG (sym
) = dip
->basereg
;
2928 SYMBOL_CLASS (sym
) = LOC_ARG
;
2931 case TAG_unspecified_parameters
:
2932 /* From varargs functions; gdb doesn't seem to have any interest in
2933 this information, so just ignore it for now. (FIXME?) */
2935 case TAG_class_type
:
2936 case TAG_structure_type
:
2937 case TAG_union_type
:
2938 case TAG_enumeration_type
:
2939 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2940 SYMBOL_DOMAIN (sym
) = STRUCT_DOMAIN
;
2941 add_symbol_to_list (sym
, list_in_scope
);
2944 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2945 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
2946 add_symbol_to_list (sym
, list_in_scope
);
2949 /* Not a tag we recognize. Hopefully we aren't processing trash
2950 data, but since we must specifically ignore things we don't
2951 recognize, there is nothing else we should do at this point. */
2962 synthesize_typedef -- make a symbol table entry for a "fake" typedef
2966 static void synthesize_typedef (struct dieinfo *dip,
2967 struct objfile *objfile,
2972 Given a pointer to a DWARF information entry, synthesize a typedef
2973 for the name in the DIE, using the specified type.
2975 This is used for C++ class, structs, unions, and enumerations to
2976 set up the tag name as a type.
2981 synthesize_typedef (struct dieinfo
*dip
, struct objfile
*objfile
,
2984 struct symbol
*sym
= NULL
;
2986 if (dip
->at_name
!= NULL
)
2988 sym
= (struct symbol
*)
2989 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct symbol
));
2990 OBJSTAT (objfile
, n_syms
++);
2991 memset (sym
, 0, sizeof (struct symbol
));
2992 DEPRECATED_SYMBOL_NAME (sym
) = create_name (dip
->at_name
,
2993 &objfile
->symbol_obstack
);
2994 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
2995 SYMBOL_TYPE (sym
) = type
;
2996 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2997 SYMBOL_DOMAIN (sym
) = VAR_DOMAIN
;
2998 add_symbol_to_list (sym
, list_in_scope
);
3006 decode_mod_fund_type -- decode a modified fundamental type
3010 static struct type *decode_mod_fund_type (char *typedata)
3014 Decode a block of data containing a modified fundamental
3015 type specification. TYPEDATA is a pointer to the block,
3016 which starts with a length containing the size of the rest
3017 of the block. At the end of the block is a fundmental type
3018 code value that gives the fundamental type. Everything
3019 in between are type modifiers.
3021 We simply compute the number of modifiers and call the general
3022 function decode_modified_type to do the actual work.
3025 static struct type
*
3026 decode_mod_fund_type (char *typedata
)
3028 struct type
*typep
= NULL
;
3029 unsigned short modcount
;
3032 /* Get the total size of the block, exclusive of the size itself */
3034 nbytes
= attribute_size (AT_mod_fund_type
);
3035 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3038 /* Deduct the size of the fundamental type bytes at the end of the block. */
3040 modcount
-= attribute_size (AT_fund_type
);
3042 /* Now do the actual decoding */
3044 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3052 decode_mod_u_d_type -- decode a modified user defined type
3056 static struct type *decode_mod_u_d_type (char *typedata)
3060 Decode a block of data containing a modified user defined
3061 type specification. TYPEDATA is a pointer to the block,
3062 which consists of a two byte length, containing the size
3063 of the rest of the block. At the end of the block is a
3064 four byte value that gives a reference to a user defined type.
3065 Everything in between are type modifiers.
3067 We simply compute the number of modifiers and call the general
3068 function decode_modified_type to do the actual work.
3071 static struct type
*
3072 decode_mod_u_d_type (char *typedata
)
3074 struct type
*typep
= NULL
;
3075 unsigned short modcount
;
3078 /* Get the total size of the block, exclusive of the size itself */
3080 nbytes
= attribute_size (AT_mod_u_d_type
);
3081 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3084 /* Deduct the size of the reference type bytes at the end of the block. */
3086 modcount
-= attribute_size (AT_user_def_type
);
3088 /* Now do the actual decoding */
3090 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3098 decode_modified_type -- decode modified user or fundamental type
3102 static struct type *decode_modified_type (char *modifiers,
3103 unsigned short modcount, int mtype)
3107 Decode a modified type, either a modified fundamental type or
3108 a modified user defined type. MODIFIERS is a pointer to the
3109 block of bytes that define MODCOUNT modifiers. Immediately
3110 following the last modifier is a short containing the fundamental
3111 type or a long containing the reference to the user defined
3112 type. Which one is determined by MTYPE, which is either
3113 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3114 type we are generating.
3116 We call ourself recursively to generate each modified type,`
3117 until MODCOUNT reaches zero, at which point we have consumed
3118 all the modifiers and generate either the fundamental type or
3119 user defined type. When the recursion unwinds, each modifier
3120 is applied in turn to generate the full modified type.
3124 If we find a modifier that we don't recognize, and it is not one
3125 of those reserved for application specific use, then we issue a
3126 warning and simply ignore the modifier.
3130 We currently ignore MOD_const and MOD_volatile. (FIXME)
3134 static struct type
*
3135 decode_modified_type (char *modifiers
, unsigned int modcount
, int mtype
)
3137 struct type
*typep
= NULL
;
3138 unsigned short fundtype
;
3147 case AT_mod_fund_type
:
3148 nbytes
= attribute_size (AT_fund_type
);
3149 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3151 typep
= decode_fund_type (fundtype
);
3153 case AT_mod_u_d_type
:
3154 nbytes
= attribute_size (AT_user_def_type
);
3155 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3157 typep
= lookup_utype (die_ref
);
3160 typep
= alloc_utype (die_ref
, NULL
);
3164 complaint (&symfile_complaints
,
3165 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)",
3166 DIE_ID
, DIE_NAME
, mtype
);
3167 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3173 modifier
= *modifiers
++;
3174 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3177 case MOD_pointer_to
:
3178 typep
= lookup_pointer_type (typep
);
3180 case MOD_reference_to
:
3181 typep
= lookup_reference_type (typep
);
3184 complaint (&symfile_complaints
,
3185 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", DIE_ID
,
3186 DIE_NAME
); /* FIXME */
3189 complaint (&symfile_complaints
,
3190 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored",
3191 DIE_ID
, DIE_NAME
); /* FIXME */
3194 if (!(MOD_lo_user
<= (unsigned char) modifier
3195 && (unsigned char) modifier
<= MOD_hi_user
))
3197 complaint (&symfile_complaints
,
3198 "DIE @ 0x%x \"%s\", unknown type modifier %u", DIE_ID
,
3199 DIE_NAME
, modifier
);
3211 decode_fund_type -- translate basic DWARF type to gdb base type
3215 Given an integer that is one of the fundamental DWARF types,
3216 translate it to one of the basic internal gdb types and return
3217 a pointer to the appropriate gdb type (a "struct type *").
3221 For robustness, if we are asked to translate a fundamental
3222 type that we are unprepared to deal with, we return int so
3223 callers can always depend upon a valid type being returned,
3224 and so gdb may at least do something reasonable by default.
3225 If the type is not in the range of those types defined as
3226 application specific types, we also issue a warning.
3229 static struct type
*
3230 decode_fund_type (unsigned int fundtype
)
3232 struct type
*typep
= NULL
;
3238 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3241 case FT_boolean
: /* Was FT_set in AT&T version */
3242 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3245 case FT_pointer
: /* (void *) */
3246 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3247 typep
= lookup_pointer_type (typep
);
3251 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3254 case FT_signed_char
:
3255 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3258 case FT_unsigned_char
:
3259 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3263 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3266 case FT_signed_short
:
3267 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3270 case FT_unsigned_short
:
3271 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3275 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3278 case FT_signed_integer
:
3279 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3282 case FT_unsigned_integer
:
3283 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3287 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3290 case FT_signed_long
:
3291 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3294 case FT_unsigned_long
:
3295 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3299 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3302 case FT_signed_long_long
:
3303 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3306 case FT_unsigned_long_long
:
3307 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3311 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3314 case FT_dbl_prec_float
:
3315 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3318 case FT_ext_prec_float
:
3319 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3323 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3326 case FT_dbl_prec_complex
:
3327 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3330 case FT_ext_prec_complex
:
3331 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3338 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3339 if (!(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3341 complaint (&symfile_complaints
,
3342 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x",
3343 DIE_ID
, DIE_NAME
, fundtype
);
3354 create_name -- allocate a fresh copy of a string on an obstack
3358 Given a pointer to a string and a pointer to an obstack, allocates
3359 a fresh copy of the string on the specified obstack.
3364 create_name (char *name
, struct obstack
*obstackp
)
3369 length
= strlen (name
) + 1;
3370 newname
= (char *) obstack_alloc (obstackp
, length
);
3371 strcpy (newname
, name
);
3379 basicdieinfo -- extract the minimal die info from raw die data
3383 void basicdieinfo (char *diep, struct dieinfo *dip,
3384 struct objfile *objfile)
3388 Given a pointer to raw DIE data, and a pointer to an instance of a
3389 die info structure, this function extracts the basic information
3390 from the DIE data required to continue processing this DIE, along
3391 with some bookkeeping information about the DIE.
3393 The information we absolutely must have includes the DIE tag,
3394 and the DIE length. If we need the sibling reference, then we
3395 will have to call completedieinfo() to process all the remaining
3398 Note that since there is no guarantee that the data is properly
3399 aligned in memory for the type of access required (indirection
3400 through anything other than a char pointer), and there is no
3401 guarantee that it is in the same byte order as the gdb host,
3402 we call a function which deals with both alignment and byte
3403 swapping issues. Possibly inefficient, but quite portable.
3405 We also take care of some other basic things at this point, such
3406 as ensuring that the instance of the die info structure starts
3407 out completely zero'd and that curdie is initialized for use
3408 in error reporting if we have a problem with the current die.
3412 All DIE's must have at least a valid length, thus the minimum
3413 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3414 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3415 are forced to be TAG_padding DIES.
3417 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3418 that if a padding DIE is used for alignment and the amount needed is
3419 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3420 enough to align to the next alignment boundry.
3422 We do some basic sanity checking here, such as verifying that the
3423 length of the die would not cause it to overrun the recorded end of
3424 the buffer holding the DIE info. If we find a DIE that is either
3425 too small or too large, we force it's length to zero which should
3426 cause the caller to take appropriate action.
3430 basicdieinfo (struct dieinfo
*dip
, char *diep
, struct objfile
*objfile
)
3433 memset (dip
, 0, sizeof (struct dieinfo
));
3435 dip
->die_ref
= dbroff
+ (diep
- dbbase
);
3436 dip
->die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3438 if ((dip
->die_length
< SIZEOF_DIE_LENGTH
) ||
3439 ((diep
+ dip
->die_length
) > (dbbase
+ dbsize
)))
3441 complaint (&symfile_complaints
,
3442 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%ld bytes)",
3443 DIE_ID
, DIE_NAME
, dip
->die_length
);
3444 dip
->die_length
= 0;
3446 else if (dip
->die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3448 dip
->die_tag
= TAG_padding
;
3452 diep
+= SIZEOF_DIE_LENGTH
;
3453 dip
->die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3462 completedieinfo -- finish reading the information for a given DIE
3466 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3470 Given a pointer to an already partially initialized die info structure,
3471 scan the raw DIE data and finish filling in the die info structure
3472 from the various attributes found.
3474 Note that since there is no guarantee that the data is properly
3475 aligned in memory for the type of access required (indirection
3476 through anything other than a char pointer), and there is no
3477 guarantee that it is in the same byte order as the gdb host,
3478 we call a function which deals with both alignment and byte
3479 swapping issues. Possibly inefficient, but quite portable.
3483 Each time we are called, we increment the diecount variable, which
3484 keeps an approximate count of the number of dies processed for
3485 each compilation unit. This information is presented to the user
3486 if the info_verbose flag is set.
3491 completedieinfo (struct dieinfo
*dip
, struct objfile
*objfile
)
3493 char *diep
; /* Current pointer into raw DIE data */
3494 char *end
; /* Terminate DIE scan here */
3495 unsigned short attr
; /* Current attribute being scanned */
3496 unsigned short form
; /* Form of the attribute */
3497 int nbytes
; /* Size of next field to read */
3501 end
= diep
+ dip
->die_length
;
3502 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3505 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3506 diep
+= SIZEOF_ATTRIBUTE
;
3507 nbytes
= attribute_size (attr
);
3510 complaint (&symfile_complaints
,
3511 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes",
3519 dip
->at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3523 dip
->at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3527 dip
->at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3531 dip
->at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3535 dip
->at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3537 dip
->has_at_stmt_list
= 1;
3540 dip
->at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3542 dip
->at_low_pc
+= baseaddr
;
3543 dip
->has_at_low_pc
= 1;
3546 dip
->at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3548 dip
->at_high_pc
+= baseaddr
;
3551 dip
->at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3554 case AT_user_def_type
:
3555 dip
->at_user_def_type
= target_to_host (diep
, nbytes
,
3556 GET_UNSIGNED
, objfile
);
3559 dip
->at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3561 dip
->has_at_byte_size
= 1;
3564 dip
->at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3568 dip
->at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3572 dip
->at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3576 dip
->at_location
= diep
;
3578 case AT_mod_fund_type
:
3579 dip
->at_mod_fund_type
= diep
;
3581 case AT_subscr_data
:
3582 dip
->at_subscr_data
= diep
;
3584 case AT_mod_u_d_type
:
3585 dip
->at_mod_u_d_type
= diep
;
3587 case AT_element_list
:
3588 dip
->at_element_list
= diep
;
3589 dip
->short_element_list
= 0;
3591 case AT_short_element_list
:
3592 dip
->at_element_list
= diep
;
3593 dip
->short_element_list
= 1;
3595 case AT_discr_value
:
3596 dip
->at_discr_value
= diep
;
3598 case AT_string_length
:
3599 dip
->at_string_length
= diep
;
3602 dip
->at_name
= diep
;
3605 /* For now, ignore any "hostname:" portion, since gdb doesn't
3606 know how to deal with it. (FIXME). */
3607 dip
->at_comp_dir
= strrchr (diep
, ':');
3608 if (dip
->at_comp_dir
!= NULL
)
3614 dip
->at_comp_dir
= diep
;
3618 dip
->at_producer
= diep
;
3620 case AT_start_scope
:
3621 dip
->at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3624 case AT_stride_size
:
3625 dip
->at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3629 dip
->at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3633 dip
->at_prototyped
= diep
;
3636 /* Found an attribute that we are unprepared to handle. However
3637 it is specifically one of the design goals of DWARF that
3638 consumers should ignore unknown attributes. As long as the
3639 form is one that we recognize (so we know how to skip it),
3640 we can just ignore the unknown attribute. */
3643 form
= FORM_FROM_ATTR (attr
);
3657 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3660 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3663 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3666 diep
+= strlen (diep
) + 1;
3669 unknown_attribute_form_complaint (DIE_ID
, DIE_NAME
, form
);
3680 target_to_host -- swap in target data to host
3684 target_to_host (char *from, int nbytes, int signextend,
3685 struct objfile *objfile)
3689 Given pointer to data in target format in FROM, a byte count for
3690 the size of the data in NBYTES, a flag indicating whether or not
3691 the data is signed in SIGNEXTEND, and a pointer to the current
3692 objfile in OBJFILE, convert the data to host format and return
3693 the converted value.
3697 FIXME: If we read data that is known to be signed, and expect to
3698 use it as signed data, then we need to explicitly sign extend the
3699 result until the bfd library is able to do this for us.
3701 FIXME: Would a 32 bit target ever need an 8 byte result?
3706 target_to_host (char *from
, int nbytes
, int signextend
, /* FIXME: Unused */
3707 struct objfile
*objfile
)
3714 rtnval
= bfd_get_64 (objfile
->obfd
, (bfd_byte
*) from
);
3717 rtnval
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) from
);
3720 rtnval
= bfd_get_16 (objfile
->obfd
, (bfd_byte
*) from
);
3723 rtnval
= bfd_get_8 (objfile
->obfd
, (bfd_byte
*) from
);
3726 complaint (&symfile_complaints
,
3727 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object",
3728 DIE_ID
, DIE_NAME
, nbytes
);
3739 attribute_size -- compute size of data for a DWARF attribute
3743 static int attribute_size (unsigned int attr)
3747 Given a DWARF attribute in ATTR, compute the size of the first
3748 piece of data associated with this attribute and return that
3751 Returns -1 for unrecognized attributes.
3756 attribute_size (unsigned int attr
)
3758 int nbytes
; /* Size of next data for this attribute */
3759 unsigned short form
; /* Form of the attribute */
3761 form
= FORM_FROM_ATTR (attr
);
3764 case FORM_STRING
: /* A variable length field is next */
3767 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3768 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3771 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3772 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3773 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3776 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3779 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3780 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3783 unknown_attribute_form_complaint (DIE_ID
, DIE_NAME
, form
);