1 /* DWARF debugging format support for GDB.
2 Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
3 Written by Fred Fish at Cygnus Support. Portions based on dbxread.c,
4 mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 FIXME: Do we need to generate dependencies in partial symtabs?
25 (Perhaps we don't need to).
27 FIXME: Resolve minor differences between what information we put in the
28 partial symbol table and what dbxread puts in. For example, we don't yet
29 put enum constants there. And dbxread seems to invent a lot of typedefs
30 we never see. Use the new printpsym command to see the partial symbol table
33 FIXME: Figure out a better way to tell gdb about the name of the function
34 contain the user's entry point (I.E. main())
36 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
37 other things to work on, if you get bored. :-)
46 #include "elf/dwarf.h"
49 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
51 #include "complaints.h"
60 /* FIXME -- convert this to SEEK_SET a la POSIX, move to config files. */
65 /* Some macros to provide DIE info for complaints. */
67 #define DIE_ID (curdie!=NULL ? curdie->die_ref : 0)
68 #define DIE_NAME (curdie!=NULL && curdie->at_name!=NULL) ? curdie->at_name : ""
70 /* Complaints that can be issued during DWARF debug info reading. */
72 struct complaint no_bfd_get_N
=
74 "DIE @ 0x%x \"%s\", no bfd support for %d byte data object", 0, 0
77 struct complaint malformed_die
=
79 "DIE @ 0x%x \"%s\", malformed DIE, bad length (%d bytes)", 0, 0
82 struct complaint bad_die_ref
=
84 "DIE @ 0x%x \"%s\", reference to DIE (0x%x) outside compilation unit", 0, 0
87 struct complaint unknown_attribute_form
=
89 "DIE @ 0x%x \"%s\", unknown attribute form (0x%x)", 0, 0
92 struct complaint unknown_attribute_length
=
94 "DIE @ 0x%x \"%s\", unknown attribute length, skipped remaining attributes", 0, 0
97 struct complaint unexpected_fund_type
=
99 "DIE @ 0x%x \"%s\", unexpected fundamental type 0x%x", 0, 0
102 struct complaint unknown_type_modifier
=
104 "DIE @ 0x%x \"%s\", unknown type modifier %u", 0, 0
107 struct complaint volatile_ignored
=
109 "DIE @ 0x%x \"%s\", type modifier 'volatile' ignored", 0, 0
112 struct complaint const_ignored
=
114 "DIE @ 0x%x \"%s\", type modifier 'const' ignored", 0, 0
117 struct complaint botched_modified_type
=
119 "DIE @ 0x%x \"%s\", botched modified type decoding (mtype 0x%x)", 0, 0
122 struct complaint op_deref2
=
124 "DIE @ 0x%x \"%s\", OP_DEREF2 address 0x%x not handled", 0, 0
127 struct complaint op_deref4
=
129 "DIE @ 0x%x \"%s\", OP_DEREF4 address 0x%x not handled", 0, 0
132 struct complaint basereg_not_handled
=
134 "DIE @ 0x%x \"%s\", BASEREG %d not handled", 0, 0
137 struct complaint dup_user_type_allocation
=
139 "DIE @ 0x%x \"%s\", internal error: duplicate user type allocation", 0, 0
142 struct complaint dup_user_type_definition
=
144 "DIE @ 0x%x \"%s\", internal error: duplicate user type definition", 0, 0
147 struct complaint missing_tag
=
149 "DIE @ 0x%x \"%s\", missing class, structure, or union tag", 0, 0
152 struct complaint bad_array_element_type
=
154 "DIE @ 0x%x \"%s\", bad array element type attribute 0x%x", 0, 0
157 struct complaint subscript_data_items
=
159 "DIE @ 0x%x \"%s\", can't decode subscript data items", 0, 0
162 struct complaint unhandled_array_subscript_format
=
164 "DIE @ 0x%x \"%s\", array subscript format 0x%x not handled yet", 0, 0
167 struct complaint unknown_array_subscript_format
=
169 "DIE @ 0x%x \"%s\", unknown array subscript format %x", 0, 0
172 struct complaint not_row_major
=
174 "DIE @ 0x%x \"%s\", array not row major; not handled correctly", 0, 0
177 typedef unsigned int DIE_REF
; /* Reference to a DIE */
180 #define GCC_PRODUCER "GNU C "
183 #ifndef GPLUS_PRODUCER
184 #define GPLUS_PRODUCER "GNU C++ "
188 #define LCC_PRODUCER "NCR C/C++"
191 #ifndef CHILL_PRODUCER
192 #define CHILL_PRODUCER "GNU Chill "
195 /* Provide a default mapping from a DWARF register number to a gdb REGNUM. */
196 #ifndef DWARF_REG_TO_REGNUM
197 #define DWARF_REG_TO_REGNUM(num) (num)
200 /* Flags to target_to_host() that tell whether or not the data object is
201 expected to be signed. Used, for example, when fetching a signed
202 integer in the target environment which is used as a signed integer
203 in the host environment, and the two environments have different sized
204 ints. In this case, *somebody* has to sign extend the smaller sized
207 #define GET_UNSIGNED 0 /* No sign extension required */
208 #define GET_SIGNED 1 /* Sign extension required */
210 /* Defines for things which are specified in the document "DWARF Debugging
211 Information Format" published by UNIX International, Programming Languages
212 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
214 #define SIZEOF_DIE_LENGTH 4
215 #define SIZEOF_DIE_TAG 2
216 #define SIZEOF_ATTRIBUTE 2
217 #define SIZEOF_FORMAT_SPECIFIER 1
218 #define SIZEOF_FMT_FT 2
219 #define SIZEOF_LINETBL_LENGTH 4
220 #define SIZEOF_LINETBL_LINENO 4
221 #define SIZEOF_LINETBL_STMT 2
222 #define SIZEOF_LINETBL_DELTA 4
223 #define SIZEOF_LOC_ATOM_CODE 1
225 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
227 /* Macros that return the sizes of various types of data in the target
230 FIXME: Currently these are just compile time constants (as they are in
231 other parts of gdb as well). They need to be able to get the right size
232 either from the bfd or possibly from the DWARF info. It would be nice if
233 the DWARF producer inserted DIES that describe the fundamental types in
234 the target environment into the DWARF info, similar to the way dbx stabs
235 producers produce information about their fundamental types. */
237 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
238 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
240 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
241 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
242 However, the Issue 2 DWARF specification from AT&T defines it as
243 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
244 For backwards compatibility with the AT&T compiler produced executables
245 we define AT_short_element_list for this variant. */
247 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
249 /* External variables referenced. */
251 extern int info_verbose
; /* From main.c; nonzero => verbose */
252 extern char *warning_pre_print
; /* From utils.c */
254 /* The DWARF debugging information consists of two major pieces,
255 one is a block of DWARF Information Entries (DIE's) and the other
256 is a line number table. The "struct dieinfo" structure contains
257 the information for a single DIE, the one currently being processed.
259 In order to make it easier to randomly access the attribute fields
260 of the current DIE, which are specifically unordered within the DIE,
261 each DIE is scanned and an instance of the "struct dieinfo"
262 structure is initialized.
264 Initialization is done in two levels. The first, done by basicdieinfo(),
265 just initializes those fields that are vital to deciding whether or not
266 to use this DIE, how to skip past it, etc. The second, done by the
267 function completedieinfo(), fills in the rest of the information.
269 Attributes which have block forms are not interpreted at the time
270 the DIE is scanned, instead we just save pointers to the start
271 of their value fields.
273 Some fields have a flag <name>_p that is set when the value of the
274 field is valid (I.E. we found a matching attribute in the DIE). Since
275 we may want to test for the presence of some attributes in the DIE,
276 such as AT_low_pc, without restricting the values of the field,
277 we need someway to note that we found such an attribute.
284 char * die
; /* Pointer to the raw DIE data */
285 unsigned long die_length
; /* Length of the raw DIE data */
286 DIE_REF die_ref
; /* Offset of this DIE */
287 unsigned short die_tag
; /* Tag for this DIE */
288 unsigned long at_padding
;
289 unsigned long at_sibling
;
292 unsigned short at_fund_type
;
293 BLOCK
* at_mod_fund_type
;
294 unsigned long at_user_def_type
;
295 BLOCK
* at_mod_u_d_type
;
296 unsigned short at_ordering
;
297 BLOCK
* at_subscr_data
;
298 unsigned long at_byte_size
;
299 unsigned short at_bit_offset
;
300 unsigned long at_bit_size
;
301 BLOCK
* at_element_list
;
302 unsigned long at_stmt_list
;
304 CORE_ADDR at_high_pc
;
305 unsigned long at_language
;
306 unsigned long at_member
;
307 unsigned long at_discr
;
308 BLOCK
* at_discr_value
;
309 BLOCK
* at_string_length
;
312 unsigned long at_start_scope
;
313 unsigned long at_stride_size
;
314 unsigned long at_src_info
;
315 char * at_prototyped
;
316 unsigned int has_at_low_pc
:1;
317 unsigned int has_at_stmt_list
:1;
318 unsigned int has_at_byte_size
:1;
319 unsigned int short_element_list
:1;
322 static int diecount
; /* Approximate count of dies for compilation unit */
323 static struct dieinfo
*curdie
; /* For warnings and such */
325 static char *dbbase
; /* Base pointer to dwarf info */
326 static int dbsize
; /* Size of dwarf info in bytes */
327 static int dbroff
; /* Relative offset from start of .debug section */
328 static char *lnbase
; /* Base pointer to line section */
329 static int isreg
; /* Kludge to identify register variables */
330 /* Kludge to identify basereg references. Nonzero if we have an offset
331 relative to a basereg. */
333 /* Which base register is it relative to? */
336 /* This value is added to each symbol value. FIXME: Generalize to
337 the section_offsets structure used by dbxread (once this is done,
338 pass the appropriate section number to end_symtab). */
339 static CORE_ADDR baseaddr
; /* Add to each symbol value */
341 /* The section offsets used in the current psymtab or symtab. FIXME,
342 only used to pass one value (baseaddr) at the moment. */
343 static struct section_offsets
*base_section_offsets
;
345 /* Each partial symbol table entry contains a pointer to private data for the
346 read_symtab() function to use when expanding a partial symbol table entry
347 to a full symbol table entry. For DWARF debugging info, this data is
348 contained in the following structure and macros are provided for easy
349 access to the members given a pointer to a partial symbol table entry.
351 dbfoff Always the absolute file offset to the start of the ".debug"
352 section for the file containing the DIE's being accessed.
354 dbroff Relative offset from the start of the ".debug" access to the
355 first DIE to be accessed. When building the partial symbol
356 table, this value will be zero since we are accessing the
357 entire ".debug" section. When expanding a partial symbol
358 table entry, this value will be the offset to the first
359 DIE for the compilation unit containing the symbol that
360 triggers the expansion.
362 dblength The size of the chunk of DIE's being examined, in bytes.
364 lnfoff The absolute file offset to the line table fragment. Ignored
365 when building partial symbol tables, but used when expanding
366 them, and contains the absolute file offset to the fragment
367 of the ".line" section containing the line numbers for the
368 current compilation unit.
372 file_ptr dbfoff
; /* Absolute file offset to start of .debug section */
373 int dbroff
; /* Relative offset from start of .debug section */
374 int dblength
; /* Size of the chunk of DIE's being examined */
375 file_ptr lnfoff
; /* Absolute file offset to line table fragment */
378 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
379 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
380 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
381 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
383 /* The generic symbol table building routines have separate lists for
384 file scope symbols and all all other scopes (local scopes). So
385 we need to select the right one to pass to add_symbol_to_list().
386 We do it by keeping a pointer to the correct list in list_in_scope.
388 FIXME: The original dwarf code just treated the file scope as the first
389 local scope, and all other local scopes as nested local scopes, and worked
390 fine. Check to see if we really need to distinguish these in buildsym.c */
392 struct pending
**list_in_scope
= &file_symbols
;
394 /* DIES which have user defined types or modified user defined types refer to
395 other DIES for the type information. Thus we need to associate the offset
396 of a DIE for a user defined type with a pointer to the type information.
398 Originally this was done using a simple but expensive algorithm, with an
399 array of unsorted structures, each containing an offset/type-pointer pair.
400 This array was scanned linearly each time a lookup was done. The result
401 was that gdb was spending over half it's startup time munging through this
402 array of pointers looking for a structure that had the right offset member.
404 The second attempt used the same array of structures, but the array was
405 sorted using qsort each time a new offset/type was recorded, and a binary
406 search was used to find the type pointer for a given DIE offset. This was
407 even slower, due to the overhead of sorting the array each time a new
408 offset/type pair was entered.
410 The third attempt uses a fixed size array of type pointers, indexed by a
411 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
412 we can divide any DIE offset by 4 to obtain a unique index into this fixed
413 size array. Since each element is a 4 byte pointer, it takes exactly as
414 much memory to hold this array as to hold the DWARF info for a given
415 compilation unit. But it gets freed as soon as we are done with it.
416 This has worked well in practice, as a reasonable tradeoff between memory
417 consumption and speed, without having to resort to much more complicated
420 static struct type
**utypes
; /* Pointer to array of user type pointers */
421 static int numutypes
; /* Max number of user type pointers */
423 /* Maintain an array of referenced fundamental types for the current
424 compilation unit being read. For DWARF version 1, we have to construct
425 the fundamental types on the fly, since no information about the
426 fundamental types is supplied. Each such fundamental type is created by
427 calling a language dependent routine to create the type, and then a
428 pointer to that type is then placed in the array at the index specified
429 by it's FT_<TYPENAME> value. The array has a fixed size set by the
430 FT_NUM_MEMBERS compile time constant, which is the number of predefined
431 fundamental types gdb knows how to construct. */
433 static struct type
*ftypes
[FT_NUM_MEMBERS
]; /* Fundamental types */
435 /* Record the language for the compilation unit which is currently being
436 processed. We know it once we have seen the TAG_compile_unit DIE,
437 and we need it while processing the DIE's for that compilation unit.
438 It is eventually saved in the symtab structure, but we don't finalize
439 the symtab struct until we have processed all the DIE's for the
440 compilation unit. We also need to get and save a pointer to the
441 language struct for this language, so we can call the language
442 dependent routines for doing things such as creating fundamental
445 static enum language cu_language
;
446 static const struct language_defn
*cu_language_defn
;
448 /* Forward declarations of static functions so we don't have to worry
449 about ordering within this file. */
452 attribute_size
PARAMS ((unsigned int));
455 target_to_host
PARAMS ((char *, int, int, struct objfile
*));
458 add_enum_psymbol
PARAMS ((struct dieinfo
*, struct objfile
*));
461 handle_producer
PARAMS ((char *));
464 read_file_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
467 read_func_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
470 read_lexical_block_scope
PARAMS ((struct dieinfo
*, char *, char *,
474 scan_partial_symbols
PARAMS ((char *, char *, struct objfile
*));
477 scan_compilation_units
PARAMS ((char *, char *, file_ptr
,
478 file_ptr
, struct objfile
*));
481 add_partial_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
484 init_psymbol_list
PARAMS ((struct objfile
*, int));
487 basicdieinfo
PARAMS ((struct dieinfo
*, char *, struct objfile
*));
490 completedieinfo
PARAMS ((struct dieinfo
*, struct objfile
*));
493 dwarf_psymtab_to_symtab
PARAMS ((struct partial_symtab
*));
496 psymtab_to_symtab_1
PARAMS ((struct partial_symtab
*));
499 read_ofile_symtab
PARAMS ((struct partial_symtab
*));
502 process_dies
PARAMS ((char *, char *, struct objfile
*));
505 read_structure_scope
PARAMS ((struct dieinfo
*, char *, char *,
509 decode_array_element_type
PARAMS ((char *));
512 decode_subscript_data_item
PARAMS ((char *, char *));
515 dwarf_read_array_type
PARAMS ((struct dieinfo
*));
518 read_tag_pointer_type
PARAMS ((struct dieinfo
*dip
));
521 read_tag_string_type
PARAMS ((struct dieinfo
*dip
));
524 read_subroutine_type
PARAMS ((struct dieinfo
*, char *, char *));
527 read_enumeration
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
530 struct_type
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
533 enum_type
PARAMS ((struct dieinfo
*, struct objfile
*));
536 decode_line_numbers
PARAMS ((char *));
539 decode_die_type
PARAMS ((struct dieinfo
*));
542 decode_mod_fund_type
PARAMS ((char *));
545 decode_mod_u_d_type
PARAMS ((char *));
548 decode_modified_type
PARAMS ((char *, unsigned int, int));
551 decode_fund_type
PARAMS ((unsigned int));
554 create_name
PARAMS ((char *, struct obstack
*));
557 lookup_utype
PARAMS ((DIE_REF
));
560 alloc_utype
PARAMS ((DIE_REF
, struct type
*));
562 static struct symbol
*
563 new_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
566 synthesize_typedef
PARAMS ((struct dieinfo
*, struct objfile
*,
570 locval
PARAMS ((char *));
573 set_cu_language
PARAMS ((struct dieinfo
*));
576 dwarf_fundamental_type
PARAMS ((struct objfile
*, int));
583 dwarf_fundamental_type -- lookup or create a fundamental type
588 dwarf_fundamental_type (struct objfile *objfile, int typeid)
592 DWARF version 1 doesn't supply any fundamental type information,
593 so gdb has to construct such types. It has a fixed number of
594 fundamental types that it knows how to construct, which is the
595 union of all types that it knows how to construct for all languages
596 that it knows about. These are enumerated in gdbtypes.h.
598 As an example, assume we find a DIE that references a DWARF
599 fundamental type of FT_integer. We first look in the ftypes
600 array to see if we already have such a type, indexed by the
601 gdb internal value of FT_INTEGER. If so, we simply return a
602 pointer to that type. If not, then we ask an appropriate
603 language dependent routine to create a type FT_INTEGER, using
604 defaults reasonable for the current target machine, and install
605 that type in ftypes for future reference.
609 Pointer to a fundamental type.
614 dwarf_fundamental_type (objfile
, typeid)
615 struct objfile
*objfile
;
618 if (typeid < 0 || typeid >= FT_NUM_MEMBERS
)
620 error ("internal error - invalid fundamental type id %d", typeid);
623 /* Look for this particular type in the fundamental type vector. If one is
624 not found, create and install one appropriate for the current language
625 and the current target machine. */
627 if (ftypes
[typeid] == NULL
)
629 ftypes
[typeid] = cu_language_defn
-> la_fund_type(objfile
, typeid);
632 return (ftypes
[typeid]);
639 set_cu_language -- set local copy of language for compilation unit
644 set_cu_language (struct dieinfo *dip)
648 Decode the language attribute for a compilation unit DIE and
649 remember what the language was. We use this at various times
650 when processing DIE's for a given compilation unit.
659 set_cu_language (dip
)
662 switch (dip
-> at_language
)
666 cu_language
= language_c
;
668 case LANG_C_PLUS_PLUS
:
669 cu_language
= language_cplus
;
672 cu_language
= language_chill
;
675 cu_language
= language_m2
;
683 /* We don't know anything special about these yet. */
684 cu_language
= language_unknown
;
687 /* If no at_language, try to deduce one from the filename */
688 cu_language
= deduce_language_from_filename (dip
-> at_name
);
691 cu_language_defn
= language_def (cu_language
);
698 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
702 void dwarf_build_psymtabs (struct objfile *objfile,
703 struct section_offsets *section_offsets,
704 int mainline, file_ptr dbfoff, unsigned int dbfsize,
705 file_ptr lnoffset, unsigned int lnsize)
709 This function is called upon to build partial symtabs from files
710 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
712 It is passed a bfd* containing the DIES
713 and line number information, the corresponding filename for that
714 file, a base address for relocating the symbols, a flag indicating
715 whether or not this debugging information is from a "main symbol
716 table" rather than a shared library or dynamically linked file,
717 and file offset/size pairs for the DIE information and line number
727 dwarf_build_psymtabs (objfile
, section_offsets
, mainline
, dbfoff
, dbfsize
,
729 struct objfile
*objfile
;
730 struct section_offsets
*section_offsets
;
733 unsigned int dbfsize
;
737 bfd
*abfd
= objfile
->obfd
;
738 struct cleanup
*back_to
;
740 current_objfile
= objfile
;
742 dbbase
= xmalloc (dbsize
);
744 if ((bfd_seek (abfd
, dbfoff
, L_SET
) != 0) ||
745 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
748 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
750 back_to
= make_cleanup (free
, dbbase
);
752 /* If we are reinitializing, or if we have never loaded syms yet, init.
753 Since we have no idea how many DIES we are looking at, we just guess
754 some arbitrary value. */
756 if (mainline
|| objfile
-> global_psymbols
.size
== 0 ||
757 objfile
-> static_psymbols
.size
== 0)
759 init_psymbol_list (objfile
, 1024);
762 /* Save the relocation factor where everybody can see it. */
764 base_section_offsets
= section_offsets
;
765 baseaddr
= ANOFFSET (section_offsets
, 0);
767 /* Follow the compilation unit sibling chain, building a partial symbol
768 table entry for each one. Save enough information about each compilation
769 unit to locate the full DWARF information later. */
771 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
773 do_cleanups (back_to
);
774 current_objfile
= NULL
;
781 read_lexical_block_scope -- process all dies in a lexical block
785 static void read_lexical_block_scope (struct dieinfo *dip,
786 char *thisdie, char *enddie)
790 Process all the DIES contained within a lexical block scope.
791 Start a new scope, process the dies, and then close the scope.
796 read_lexical_block_scope (dip
, thisdie
, enddie
, objfile
)
800 struct objfile
*objfile
;
802 register struct context_stack
*new;
804 push_context (0, dip
-> at_low_pc
);
805 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
806 new = pop_context ();
807 if (local_symbols
!= NULL
)
809 finish_block (0, &local_symbols
, new -> old_blocks
, new -> start_addr
,
810 dip
-> at_high_pc
, objfile
);
812 local_symbols
= new -> locals
;
819 lookup_utype -- look up a user defined type from die reference
823 static type *lookup_utype (DIE_REF die_ref)
827 Given a DIE reference, lookup the user defined type associated with
828 that DIE, if it has been registered already. If not registered, then
829 return NULL. Alloc_utype() can be called to register an empty
830 type for this reference, which will be filled in later when the
831 actual referenced DIE is processed.
835 lookup_utype (die_ref
)
838 struct type
*type
= NULL
;
841 utypeidx
= (die_ref
- dbroff
) / 4;
842 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
844 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
848 type
= *(utypes
+ utypeidx
);
858 alloc_utype -- add a user defined type for die reference
862 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
866 Given a die reference DIE_REF, and a possible pointer to a user
867 defined type UTYPEP, register that this reference has a user
868 defined type and either use the specified type in UTYPEP or
869 make a new empty type that will be filled in later.
871 We should only be called after calling lookup_utype() to verify that
872 there is not currently a type registered for DIE_REF.
876 alloc_utype (die_ref
, utypep
)
883 utypeidx
= (die_ref
- dbroff
) / 4;
884 typep
= utypes
+ utypeidx
;
885 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
887 utypep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
888 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
);
890 else if (*typep
!= NULL
)
893 complain (&dup_user_type_allocation
, DIE_ID
, DIE_NAME
);
899 utypep
= alloc_type (current_objfile
);
910 decode_die_type -- return a type for a specified die
914 static struct type *decode_die_type (struct dieinfo *dip)
918 Given a pointer to a die information structure DIP, decode the
919 type of the die and return a pointer to the decoded type. All
920 dies without specific types default to type int.
924 decode_die_type (dip
)
927 struct type
*type
= NULL
;
929 if (dip
-> at_fund_type
!= 0)
931 type
= decode_fund_type (dip
-> at_fund_type
);
933 else if (dip
-> at_mod_fund_type
!= NULL
)
935 type
= decode_mod_fund_type (dip
-> at_mod_fund_type
);
937 else if (dip
-> at_user_def_type
)
939 if ((type
= lookup_utype (dip
-> at_user_def_type
)) == NULL
)
941 type
= alloc_utype (dip
-> at_user_def_type
, NULL
);
944 else if (dip
-> at_mod_u_d_type
)
946 type
= decode_mod_u_d_type (dip
-> at_mod_u_d_type
);
950 type
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
959 struct_type -- compute and return the type for a struct or union
963 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
964 char *enddie, struct objfile *objfile)
968 Given pointer to a die information structure for a die which
969 defines a union or structure (and MUST define one or the other),
970 and pointers to the raw die data that define the range of dies which
971 define the members, compute and return the user defined type for the
976 struct_type (dip
, thisdie
, enddie
, objfile
)
980 struct objfile
*objfile
;
984 struct nextfield
*next
;
987 struct nextfield
*list
= NULL
;
988 struct nextfield
*new;
995 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
997 /* No forward references created an empty type, so install one now */
998 type
= alloc_utype (dip
-> die_ref
, NULL
);
1000 INIT_CPLUS_SPECIFIC(type
);
1001 switch (dip
-> die_tag
)
1003 case TAG_class_type
:
1004 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
1006 case TAG_structure_type
:
1007 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
1009 case TAG_union_type
:
1010 TYPE_CODE (type
) = TYPE_CODE_UNION
;
1013 /* Should never happen */
1014 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
1015 complain (&missing_tag
, DIE_ID
, DIE_NAME
);
1018 /* Some compilers try to be helpful by inventing "fake" names for
1019 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1020 Thanks, but no thanks... */
1021 if (dip
-> at_name
!= NULL
1022 && *dip
-> at_name
!= '~'
1023 && *dip
-> at_name
!= '.')
1025 TYPE_TAG_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1026 "", "", dip
-> at_name
);
1028 /* Use whatever size is known. Zero is a valid size. We might however
1029 wish to check has_at_byte_size to make sure that some byte size was
1030 given explicitly, but DWARF doesn't specify that explicit sizes of
1031 zero have to present, so complaining about missing sizes should
1032 probably not be the default. */
1033 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1034 thisdie
+= dip
-> die_length
;
1035 while (thisdie
< enddie
)
1037 basicdieinfo (&mbr
, thisdie
, objfile
);
1038 completedieinfo (&mbr
, objfile
);
1039 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
1043 else if (mbr
.at_sibling
!= 0)
1045 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
1049 nextdie
= thisdie
+ mbr
.die_length
;
1051 switch (mbr
.die_tag
)
1054 /* Get space to record the next field's data. */
1055 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1058 /* Save the data. */
1059 list
-> field
.name
=
1060 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
1061 &objfile
-> type_obstack
);
1062 list
-> field
.type
= decode_die_type (&mbr
);
1063 list
-> field
.bitpos
= 8 * locval (mbr
.at_location
);
1064 /* Handle bit fields. */
1065 list
-> field
.bitsize
= mbr
.at_bit_size
;
1066 if (BITS_BIG_ENDIAN
)
1068 /* For big endian bits, the at_bit_offset gives the
1069 additional bit offset from the MSB of the containing
1070 anonymous object to the MSB of the field. We don't
1071 have to do anything special since we don't need to
1072 know the size of the anonymous object. */
1073 list
-> field
.bitpos
+= mbr
.at_bit_offset
;
1077 /* For little endian bits, we need to have a non-zero
1078 at_bit_size, so that we know we are in fact dealing
1079 with a bitfield. Compute the bit offset to the MSB
1080 of the anonymous object, subtract off the number of
1081 bits from the MSB of the field to the MSB of the
1082 object, and then subtract off the number of bits of
1083 the field itself. The result is the bit offset of
1084 the LSB of the field. */
1085 if (mbr
.at_bit_size
> 0)
1087 if (mbr
.has_at_byte_size
)
1089 /* The size of the anonymous object containing
1090 the bit field is explicit, so use the
1091 indicated size (in bytes). */
1092 anonymous_size
= mbr
.at_byte_size
;
1096 /* The size of the anonymous object containing
1097 the bit field matches the size of an object
1098 of the bit field's type. DWARF allows
1099 at_byte_size to be left out in such cases, as
1100 a debug information size optimization. */
1101 anonymous_size
= TYPE_LENGTH (list
-> field
.type
);
1103 list
-> field
.bitpos
+=
1104 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
1110 process_dies (thisdie
, nextdie
, objfile
);
1115 /* Now create the vector of fields, and record how big it is. We may
1116 not even have any fields, if this DIE was generated due to a reference
1117 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1118 set, which clues gdb in to the fact that it needs to search elsewhere
1119 for the full structure definition. */
1122 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1126 TYPE_NFIELDS (type
) = nfields
;
1127 TYPE_FIELDS (type
) = (struct field
*)
1128 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1129 /* Copy the saved-up fields into the field vector. */
1130 for (n
= nfields
; list
; list
= list
-> next
)
1132 TYPE_FIELD (type
, --n
) = list
-> field
;
1142 read_structure_scope -- process all dies within struct or union
1146 static void read_structure_scope (struct dieinfo *dip,
1147 char *thisdie, char *enddie, struct objfile *objfile)
1151 Called when we find the DIE that starts a structure or union
1152 scope (definition) to process all dies that define the members
1153 of the structure or union. DIP is a pointer to the die info
1154 struct for the DIE that names the structure or union.
1158 Note that we need to call struct_type regardless of whether or not
1159 the DIE has an at_name attribute, since it might be an anonymous
1160 structure or union. This gets the type entered into our set of
1163 However, if the structure is incomplete (an opaque struct/union)
1164 then suppress creating a symbol table entry for it since gdb only
1165 wants to find the one with the complete definition. Note that if
1166 it is complete, we just call new_symbol, which does it's own
1167 checking about whether the struct/union is anonymous or not (and
1168 suppresses creating a symbol table entry itself).
1173 read_structure_scope (dip
, thisdie
, enddie
, objfile
)
1174 struct dieinfo
*dip
;
1177 struct objfile
*objfile
;
1182 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1183 if (!(TYPE_FLAGS (type
) & TYPE_FLAG_STUB
))
1185 sym
= new_symbol (dip
, objfile
);
1188 SYMBOL_TYPE (sym
) = type
;
1189 if (cu_language
== language_cplus
)
1191 synthesize_typedef (dip
, objfile
, type
);
1201 decode_array_element_type -- decode type of the array elements
1205 static struct type *decode_array_element_type (char *scan, char *end)
1209 As the last step in decoding the array subscript information for an
1210 array DIE, we need to decode the type of the array elements. We are
1211 passed a pointer to this last part of the subscript information and
1212 must return the appropriate type. If the type attribute is not
1213 recognized, just warn about the problem and return type int.
1216 static struct type
*
1217 decode_array_element_type (scan
)
1222 unsigned short attribute
;
1223 unsigned short fundtype
;
1226 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1228 scan
+= SIZEOF_ATTRIBUTE
;
1229 if ((nbytes
= attribute_size (attribute
)) == -1)
1231 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1232 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1239 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1241 typep
= decode_fund_type (fundtype
);
1243 case AT_mod_fund_type
:
1244 typep
= decode_mod_fund_type (scan
);
1246 case AT_user_def_type
:
1247 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1249 if ((typep
= lookup_utype (die_ref
)) == NULL
)
1251 typep
= alloc_utype (die_ref
, NULL
);
1254 case AT_mod_u_d_type
:
1255 typep
= decode_mod_u_d_type (scan
);
1258 complain (&bad_array_element_type
, DIE_ID
, DIE_NAME
, attribute
);
1259 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1270 decode_subscript_data_item -- decode array subscript item
1274 static struct type *
1275 decode_subscript_data_item (char *scan, char *end)
1279 The array subscripts and the data type of the elements of an
1280 array are described by a list of data items, stored as a block
1281 of contiguous bytes. There is a data item describing each array
1282 dimension, and a final data item describing the element type.
1283 The data items are ordered the same as their appearance in the
1284 source (I.E. leftmost dimension first, next to leftmost second,
1287 The data items describing each array dimension consist of four
1288 parts: (1) a format specifier, (2) type type of the subscript
1289 index, (3) a description of the low bound of the array dimension,
1290 and (4) a description of the high bound of the array dimension.
1292 The last data item is the description of the type of each of
1295 We are passed a pointer to the start of the block of bytes
1296 containing the remaining data items, and a pointer to the first
1297 byte past the data. This function recursively decodes the
1298 remaining data items and returns a type.
1300 If we somehow fail to decode some data, we complain about it
1301 and return a type "array of int".
1304 FIXME: This code only implements the forms currently used
1305 by the AT&T and GNU C compilers.
1307 The end pointer is supplied for error checking, maybe we should
1311 static struct type
*
1312 decode_subscript_data_item (scan
, end
)
1316 struct type
*typep
= NULL
; /* Array type we are building */
1317 struct type
*nexttype
; /* Type of each element (may be array) */
1318 struct type
*indextype
; /* Type of this index */
1319 struct type
*rangetype
;
1320 unsigned int format
;
1321 unsigned short fundtype
;
1322 unsigned long lowbound
;
1323 unsigned long highbound
;
1326 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1328 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1332 typep
= decode_array_element_type (scan
);
1335 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1337 indextype
= decode_fund_type (fundtype
);
1338 scan
+= SIZEOF_FMT_FT
;
1339 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1340 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1342 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1344 nexttype
= decode_subscript_data_item (scan
, end
);
1345 if (nexttype
== NULL
)
1347 /* Munged subscript data or other problem, fake it. */
1348 complain (&subscript_data_items
, DIE_ID
, DIE_NAME
);
1349 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1351 rangetype
= create_range_type ((struct type
*) NULL
, indextype
,
1352 lowbound
, highbound
);
1353 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1362 complain (&unhandled_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1363 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1364 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1365 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1368 complain (&unknown_array_subscript_format
, DIE_ID
, DIE_NAME
, format
);
1369 nexttype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1370 rangetype
= create_range_type ((struct type
*) NULL
, nexttype
, 0, 0);
1371 typep
= create_array_type ((struct type
*) NULL
, nexttype
, rangetype
);
1381 dwarf_read_array_type -- read TAG_array_type DIE
1385 static void dwarf_read_array_type (struct dieinfo *dip)
1389 Extract all information from a TAG_array_type DIE and add to
1390 the user defined type vector.
1394 dwarf_read_array_type (dip
)
1395 struct dieinfo
*dip
;
1401 unsigned short blocksz
;
1404 if (dip
-> at_ordering
!= ORD_row_major
)
1406 /* FIXME: Can gdb even handle column major arrays? */
1407 complain (¬_row_major
, DIE_ID
, DIE_NAME
);
1409 if ((sub
= dip
-> at_subscr_data
) != NULL
)
1411 nbytes
= attribute_size (AT_subscr_data
);
1412 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1413 subend
= sub
+ nbytes
+ blocksz
;
1415 type
= decode_subscript_data_item (sub
, subend
);
1416 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1418 /* Install user defined type that has not been referenced yet. */
1419 alloc_utype (dip
-> die_ref
, type
);
1421 else if (TYPE_CODE (utype
) == TYPE_CODE_UNDEF
)
1423 /* Ick! A forward ref has already generated a blank type in our
1424 slot, and this type probably already has things pointing to it
1425 (which is what caused it to be created in the first place).
1426 If it's just a place holder we can plop our fully defined type
1427 on top of it. We can't recover the space allocated for our
1428 new type since it might be on an obstack, but we could reuse
1429 it if we kept a list of them, but it might not be worth it
1435 /* Double ick! Not only is a type already in our slot, but
1436 someone has decorated it. Complain and leave it alone. */
1437 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1446 read_tag_pointer_type -- read TAG_pointer_type DIE
1450 static void read_tag_pointer_type (struct dieinfo *dip)
1454 Extract all information from a TAG_pointer_type DIE and add to
1455 the user defined type vector.
1459 read_tag_pointer_type (dip
)
1460 struct dieinfo
*dip
;
1465 type
= decode_die_type (dip
);
1466 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1468 utype
= lookup_pointer_type (type
);
1469 alloc_utype (dip
-> die_ref
, utype
);
1473 TYPE_TARGET_TYPE (utype
) = type
;
1474 TYPE_POINTER_TYPE (type
) = utype
;
1476 /* We assume the machine has only one representation for pointers! */
1477 /* FIXME: This confuses host<->target data representations, and is a
1478 poor assumption besides. */
1480 TYPE_LENGTH (utype
) = sizeof (char *);
1481 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1489 read_tag_string_type -- read TAG_string_type DIE
1493 static void read_tag_string_type (struct dieinfo *dip)
1497 Extract all information from a TAG_string_type DIE and add to
1498 the user defined type vector. It isn't really a user defined
1499 type, but it behaves like one, with other DIE's using an
1500 AT_user_def_type attribute to reference it.
1504 read_tag_string_type (dip
)
1505 struct dieinfo
*dip
;
1508 struct type
*indextype
;
1509 struct type
*rangetype
;
1510 unsigned long lowbound
= 0;
1511 unsigned long highbound
;
1513 if (dip
-> has_at_byte_size
)
1515 /* A fixed bounds string */
1516 highbound
= dip
-> at_byte_size
- 1;
1520 /* A varying length string. Stub for now. (FIXME) */
1523 indextype
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1524 rangetype
= create_range_type ((struct type
*) NULL
, indextype
, lowbound
,
1527 utype
= lookup_utype (dip
-> die_ref
);
1530 /* No type defined, go ahead and create a blank one to use. */
1531 utype
= alloc_utype (dip
-> die_ref
, (struct type
*) NULL
);
1535 /* Already a type in our slot due to a forward reference. Make sure it
1536 is a blank one. If not, complain and leave it alone. */
1537 if (TYPE_CODE (utype
) != TYPE_CODE_UNDEF
)
1539 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1544 /* Create the string type using the blank type we either found or created. */
1545 utype
= create_string_type (utype
, rangetype
);
1552 read_subroutine_type -- process TAG_subroutine_type dies
1556 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1561 Handle DIES due to C code like:
1564 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1570 The parameter DIES are currently ignored. See if gdb has a way to
1571 include this info in it's type system, and decode them if so. Is
1572 this what the type structure's "arg_types" field is for? (FIXME)
1576 read_subroutine_type (dip
, thisdie
, enddie
)
1577 struct dieinfo
*dip
;
1581 struct type
*type
; /* Type that this function returns */
1582 struct type
*ftype
; /* Function that returns above type */
1584 /* Decode the type that this subroutine returns */
1586 type
= decode_die_type (dip
);
1588 /* Check to see if we already have a partially constructed user
1589 defined type for this DIE, from a forward reference. */
1591 if ((ftype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1593 /* This is the first reference to one of these types. Make
1594 a new one and place it in the user defined types. */
1595 ftype
= lookup_function_type (type
);
1596 alloc_utype (dip
-> die_ref
, ftype
);
1598 else if (TYPE_CODE (ftype
) == TYPE_CODE_UNDEF
)
1600 /* We have an existing partially constructed type, so bash it
1601 into the correct type. */
1602 TYPE_TARGET_TYPE (ftype
) = type
;
1603 TYPE_LENGTH (ftype
) = 1;
1604 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1608 complain (&dup_user_type_definition
, DIE_ID
, DIE_NAME
);
1616 read_enumeration -- process dies which define an enumeration
1620 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1621 char *enddie, struct objfile *objfile)
1625 Given a pointer to a die which begins an enumeration, process all
1626 the dies that define the members of the enumeration.
1630 Note that we need to call enum_type regardless of whether or not we
1631 have a symbol, since we might have an enum without a tag name (thus
1632 no symbol for the tagname).
1636 read_enumeration (dip
, thisdie
, enddie
, objfile
)
1637 struct dieinfo
*dip
;
1640 struct objfile
*objfile
;
1645 type
= enum_type (dip
, objfile
);
1646 sym
= new_symbol (dip
, objfile
);
1649 SYMBOL_TYPE (sym
) = type
;
1650 if (cu_language
== language_cplus
)
1652 synthesize_typedef (dip
, objfile
, type
);
1661 enum_type -- decode and return a type for an enumeration
1665 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1669 Given a pointer to a die information structure for the die which
1670 starts an enumeration, process all the dies that define the members
1671 of the enumeration and return a type pointer for the enumeration.
1673 At the same time, for each member of the enumeration, create a
1674 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1675 and give it the type of the enumeration itself.
1679 Note that the DWARF specification explicitly mandates that enum
1680 constants occur in reverse order from the source program order,
1681 for "consistency" and because this ordering is easier for many
1682 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1683 Entries). Because gdb wants to see the enum members in program
1684 source order, we have to ensure that the order gets reversed while
1685 we are processing them.
1688 static struct type
*
1689 enum_type (dip
, objfile
)
1690 struct dieinfo
*dip
;
1691 struct objfile
*objfile
;
1695 struct nextfield
*next
;
1698 struct nextfield
*list
= NULL
;
1699 struct nextfield
*new;
1704 unsigned short blocksz
;
1708 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1710 /* No forward references created an empty type, so install one now */
1711 type
= alloc_utype (dip
-> die_ref
, NULL
);
1713 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1714 /* Some compilers try to be helpful by inventing "fake" names for
1715 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1716 Thanks, but no thanks... */
1717 if (dip
-> at_name
!= NULL
1718 && *dip
-> at_name
!= '~'
1719 && *dip
-> at_name
!= '.')
1721 TYPE_TAG_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1722 "", "", dip
-> at_name
);
1724 if (dip
-> at_byte_size
!= 0)
1726 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1728 if ((scan
= dip
-> at_element_list
) != NULL
)
1730 if (dip
-> short_element_list
)
1732 nbytes
= attribute_size (AT_short_element_list
);
1736 nbytes
= attribute_size (AT_element_list
);
1738 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1739 listend
= scan
+ nbytes
+ blocksz
;
1741 while (scan
< listend
)
1743 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1746 list
-> field
.type
= NULL
;
1747 list
-> field
.bitsize
= 0;
1748 list
-> field
.bitpos
=
1749 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1751 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1752 list
-> field
.name
= obsavestring (scan
, strlen (scan
),
1753 &objfile
-> type_obstack
);
1754 scan
+= strlen (scan
) + 1;
1756 /* Handcraft a new symbol for this enum member. */
1757 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1758 sizeof (struct symbol
));
1759 memset (sym
, 0, sizeof (struct symbol
));
1760 SYMBOL_NAME (sym
) = create_name (list
-> field
.name
,
1761 &objfile
->symbol_obstack
);
1762 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
1763 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1764 SYMBOL_CLASS (sym
) = LOC_CONST
;
1765 SYMBOL_TYPE (sym
) = type
;
1766 SYMBOL_VALUE (sym
) = list
-> field
.bitpos
;
1767 add_symbol_to_list (sym
, list_in_scope
);
1769 /* Now create the vector of fields, and record how big it is. This is
1770 where we reverse the order, by pulling the members off the list in
1771 reverse order from how they were inserted. If we have no fields
1772 (this is apparently possible in C++) then skip building a field
1776 TYPE_NFIELDS (type
) = nfields
;
1777 TYPE_FIELDS (type
) = (struct field
*)
1778 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1779 /* Copy the saved-up fields into the field vector. */
1780 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
-> next
)
1782 TYPE_FIELD (type
, n
++) = list
-> field
;
1793 read_func_scope -- process all dies within a function scope
1797 Process all dies within a given function scope. We are passed
1798 a die information structure pointer DIP for the die which
1799 starts the function scope, and pointers into the raw die data
1800 that define the dies within the function scope.
1802 For now, we ignore lexical block scopes within the function.
1803 The problem is that AT&T cc does not define a DWARF lexical
1804 block scope for the function itself, while gcc defines a
1805 lexical block scope for the function. We need to think about
1806 how to handle this difference, or if it is even a problem.
1811 read_func_scope (dip
, thisdie
, enddie
, objfile
)
1812 struct dieinfo
*dip
;
1815 struct objfile
*objfile
;
1817 register struct context_stack
*new;
1819 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1820 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1822 objfile
-> ei
.entry_func_lowpc
= dip
-> at_low_pc
;
1823 objfile
-> ei
.entry_func_highpc
= dip
-> at_high_pc
;
1825 if (STREQ (dip
-> at_name
, "main")) /* FIXME: hardwired name */
1827 objfile
-> ei
.main_func_lowpc
= dip
-> at_low_pc
;
1828 objfile
-> ei
.main_func_highpc
= dip
-> at_high_pc
;
1830 new = push_context (0, dip
-> at_low_pc
);
1831 new -> name
= new_symbol (dip
, objfile
);
1832 list_in_scope
= &local_symbols
;
1833 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1834 new = pop_context ();
1835 /* Make a block for the local symbols within. */
1836 finish_block (new -> name
, &local_symbols
, new -> old_blocks
,
1837 new -> start_addr
, dip
-> at_high_pc
, objfile
);
1838 list_in_scope
= &file_symbols
;
1846 handle_producer -- process the AT_producer attribute
1850 Perform any operations that depend on finding a particular
1851 AT_producer attribute.
1856 handle_producer (producer
)
1860 /* If this compilation unit was compiled with g++ or gcc, then set the
1861 processing_gcc_compilation flag. */
1863 processing_gcc_compilation
=
1864 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
))
1865 || STREQN (producer
, CHILL_PRODUCER
, strlen (CHILL_PRODUCER
))
1866 || STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
));
1868 /* Select a demangling style if we can identify the producer and if
1869 the current style is auto. We leave the current style alone if it
1870 is not auto. We also leave the demangling style alone if we find a
1871 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1873 if (AUTO_DEMANGLING
)
1875 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1877 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1879 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1881 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1891 read_file_scope -- process all dies within a file scope
1895 Process all dies within a given file scope. We are passed a
1896 pointer to the die information structure for the die which
1897 starts the file scope, and pointers into the raw die data which
1898 mark the range of dies within the file scope.
1900 When the partial symbol table is built, the file offset for the line
1901 number table for each compilation unit is saved in the partial symbol
1902 table entry for that compilation unit. As the symbols for each
1903 compilation unit are read, the line number table is read into memory
1904 and the variable lnbase is set to point to it. Thus all we have to
1905 do is use lnbase to access the line number table for the current
1910 read_file_scope (dip
, thisdie
, enddie
, objfile
)
1911 struct dieinfo
*dip
;
1914 struct objfile
*objfile
;
1916 struct cleanup
*back_to
;
1917 struct symtab
*symtab
;
1919 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1920 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1922 objfile
-> ei
.entry_file_lowpc
= dip
-> at_low_pc
;
1923 objfile
-> ei
.entry_file_highpc
= dip
-> at_high_pc
;
1925 set_cu_language (dip
);
1926 if (dip
-> at_producer
!= NULL
)
1928 handle_producer (dip
-> at_producer
);
1930 numutypes
= (enddie
- thisdie
) / 4;
1931 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1932 back_to
= make_cleanup (free
, utypes
);
1933 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1934 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1935 start_symtab (dip
-> at_name
, dip
-> at_comp_dir
, dip
-> at_low_pc
);
1936 decode_line_numbers (lnbase
);
1937 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1939 symtab
= end_symtab (dip
-> at_high_pc
, 0, 0, objfile
, 0);
1942 symtab
-> language
= cu_language
;
1944 do_cleanups (back_to
);
1953 process_dies -- process a range of DWARF Information Entries
1957 static void process_dies (char *thisdie, char *enddie,
1958 struct objfile *objfile)
1962 Process all DIE's in a specified range. May be (and almost
1963 certainly will be) called recursively.
1967 process_dies (thisdie
, enddie
, objfile
)
1970 struct objfile
*objfile
;
1975 while (thisdie
< enddie
)
1977 basicdieinfo (&di
, thisdie
, objfile
);
1978 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1982 else if (di
.die_tag
== TAG_padding
)
1984 nextdie
= thisdie
+ di
.die_length
;
1988 completedieinfo (&di
, objfile
);
1989 if (di
.at_sibling
!= 0)
1991 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1995 nextdie
= thisdie
+ di
.die_length
;
1997 #ifdef SMASH_TEXT_ADDRESS
1998 /* I think that these are always text, not data, addresses. */
1999 SMASH_TEXT_ADDRESS (di
.at_low_pc
);
2000 SMASH_TEXT_ADDRESS (di
.at_high_pc
);
2004 case TAG_compile_unit
:
2005 /* Skip Tag_compile_unit if we are already inside a compilation
2006 unit, we are unable to handle nested compilation units
2007 properly (FIXME). */
2008 if (current_subfile
== NULL
)
2009 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
2011 nextdie
= thisdie
+ di
.die_length
;
2013 case TAG_global_subroutine
:
2014 case TAG_subroutine
:
2015 if (di
.has_at_low_pc
)
2017 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
2020 case TAG_lexical_block
:
2021 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
2023 case TAG_class_type
:
2024 case TAG_structure_type
:
2025 case TAG_union_type
:
2026 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
2028 case TAG_enumeration_type
:
2029 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
2031 case TAG_subroutine_type
:
2032 read_subroutine_type (&di
, thisdie
, nextdie
);
2034 case TAG_array_type
:
2035 dwarf_read_array_type (&di
);
2037 case TAG_pointer_type
:
2038 read_tag_pointer_type (&di
);
2040 case TAG_string_type
:
2041 read_tag_string_type (&di
);
2044 new_symbol (&di
, objfile
);
2056 decode_line_numbers -- decode a line number table fragment
2060 static void decode_line_numbers (char *tblscan, char *tblend,
2061 long length, long base, long line, long pc)
2065 Translate the DWARF line number information to gdb form.
2067 The ".line" section contains one or more line number tables, one for
2068 each ".line" section from the objects that were linked.
2070 The AT_stmt_list attribute for each TAG_source_file entry in the
2071 ".debug" section contains the offset into the ".line" section for the
2072 start of the table for that file.
2074 The table itself has the following structure:
2076 <table length><base address><source statement entry>
2077 4 bytes 4 bytes 10 bytes
2079 The table length is the total size of the table, including the 4 bytes
2080 for the length information.
2082 The base address is the address of the first instruction generated
2083 for the source file.
2085 Each source statement entry has the following structure:
2087 <line number><statement position><address delta>
2088 4 bytes 2 bytes 4 bytes
2090 The line number is relative to the start of the file, starting with
2093 The statement position either -1 (0xFFFF) or the number of characters
2094 from the beginning of the line to the beginning of the statement.
2096 The address delta is the difference between the base address and
2097 the address of the first instruction for the statement.
2099 Note that we must copy the bytes from the packed table to our local
2100 variables before attempting to use them, to avoid alignment problems
2101 on some machines, particularly RISC processors.
2105 Does gdb expect the line numbers to be sorted? They are now by
2106 chance/luck, but are not required to be. (FIXME)
2108 The line with number 0 is unused, gdb apparently can discover the
2109 span of the last line some other way. How? (FIXME)
2113 decode_line_numbers (linetable
)
2118 unsigned long length
;
2123 if (linetable
!= NULL
)
2125 tblscan
= tblend
= linetable
;
2126 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2128 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2130 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2131 GET_UNSIGNED
, current_objfile
);
2132 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2134 while (tblscan
< tblend
)
2136 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2138 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2139 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2141 tblscan
+= SIZEOF_LINETBL_DELTA
;
2145 record_line (current_subfile
, line
, pc
);
2155 locval -- compute the value of a location attribute
2159 static int locval (char *loc)
2163 Given pointer to a string of bytes that define a location, compute
2164 the location and return the value.
2166 When computing values involving the current value of the frame pointer,
2167 the value zero is used, which results in a value relative to the frame
2168 pointer, rather than the absolute value. This is what GDB wants
2171 When the result is a register number, the global isreg flag is set,
2172 otherwise it is cleared. This is a kludge until we figure out a better
2173 way to handle the problem. Gdb's design does not mesh well with the
2174 DWARF notion of a location computing interpreter, which is a shame
2175 because the flexibility goes unused.
2179 Note that stack[0] is unused except as a default error return.
2180 Note that stack overflow is not yet handled.
2187 unsigned short nbytes
;
2188 unsigned short locsize
;
2189 auto long stack
[64];
2195 nbytes
= attribute_size (AT_location
);
2196 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2198 end
= loc
+ locsize
;
2203 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2206 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2208 loc
+= SIZEOF_LOC_ATOM_CODE
;
2209 switch (loc_atom_code
)
2216 /* push register (number) */
2218 = DWARF_REG_TO_REGNUM (target_to_host (loc
, loc_value_size
,
2221 loc
+= loc_value_size
;
2225 /* push value of register (number) */
2226 /* Actually, we compute the value as if register has 0, so the
2227 value ends up being the offset from that register. */
2229 basereg
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2231 loc
+= loc_value_size
;
2232 stack
[++stacki
] = 0;
2235 /* push address (relocated address) */
2236 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2237 GET_UNSIGNED
, current_objfile
);
2238 loc
+= loc_value_size
;
2241 /* push constant (number) FIXME: signed or unsigned! */
2242 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2243 GET_SIGNED
, current_objfile
);
2244 loc
+= loc_value_size
;
2247 /* pop, deref and push 2 bytes (as a long) */
2248 complain (&op_deref2
, DIE_ID
, DIE_NAME
, stack
[stacki
]);
2250 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2251 complain (&op_deref4
, DIE_ID
, DIE_NAME
, stack
[stacki
]);
2253 case OP_ADD
: /* pop top 2 items, add, push result */
2254 stack
[stacki
- 1] += stack
[stacki
];
2259 return (stack
[stacki
]);
2266 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2270 static void read_ofile_symtab (struct partial_symtab *pst)
2274 When expanding a partial symbol table entry to a full symbol table
2275 entry, this is the function that gets called to read in the symbols
2276 for the compilation unit. A pointer to the newly constructed symtab,
2277 which is now the new first one on the objfile's symtab list, is
2278 stashed in the partial symbol table entry.
2282 read_ofile_symtab (pst
)
2283 struct partial_symtab
*pst
;
2285 struct cleanup
*back_to
;
2286 unsigned long lnsize
;
2289 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2291 abfd
= pst
-> objfile
-> obfd
;
2292 current_objfile
= pst
-> objfile
;
2294 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2295 unit, seek to the location in the file, and read in all the DIE's. */
2298 dbsize
= DBLENGTH (pst
);
2299 dbbase
= xmalloc (dbsize
);
2300 dbroff
= DBROFF(pst
);
2301 foffset
= DBFOFF(pst
) + dbroff
;
2302 base_section_offsets
= pst
->section_offsets
;
2303 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2304 if (bfd_seek (abfd
, foffset
, L_SET
) ||
2305 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
2308 error ("can't read DWARF data");
2310 back_to
= make_cleanup (free
, dbbase
);
2312 /* If there is a line number table associated with this compilation unit
2313 then read the size of this fragment in bytes, from the fragment itself.
2314 Allocate a buffer for the fragment and read it in for future
2320 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2321 (bfd_read ((PTR
) lnsizedata
, sizeof (lnsizedata
), 1, abfd
) !=
2322 sizeof (lnsizedata
)))
2324 error ("can't read DWARF line number table size");
2326 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2327 GET_UNSIGNED
, pst
-> objfile
);
2328 lnbase
= xmalloc (lnsize
);
2329 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2330 (bfd_read (lnbase
, lnsize
, 1, abfd
) != lnsize
))
2333 error ("can't read DWARF line numbers");
2335 make_cleanup (free
, lnbase
);
2338 process_dies (dbbase
, dbbase
+ dbsize
, pst
-> objfile
);
2339 do_cleanups (back_to
);
2340 current_objfile
= NULL
;
2341 pst
-> symtab
= pst
-> objfile
-> symtabs
;
2348 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2352 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2356 Called once for each partial symbol table entry that needs to be
2357 expanded into a full symbol table entry.
2362 psymtab_to_symtab_1 (pst
)
2363 struct partial_symtab
*pst
;
2366 struct cleanup
*old_chain
;
2372 warning ("psymtab for %s already read in. Shouldn't happen.",
2377 /* Read in all partial symtabs on which this one is dependent */
2378 for (i
= 0; i
< pst
-> number_of_dependencies
; i
++)
2380 if (!pst
-> dependencies
[i
] -> readin
)
2382 /* Inform about additional files that need to be read in. */
2385 fputs_filtered (" ", gdb_stdout
);
2387 fputs_filtered ("and ", gdb_stdout
);
2389 printf_filtered ("%s...",
2390 pst
-> dependencies
[i
] -> filename
);
2392 gdb_flush (gdb_stdout
); /* Flush output */
2394 psymtab_to_symtab_1 (pst
-> dependencies
[i
]);
2397 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2400 old_chain
= make_cleanup (really_free_pendings
, 0);
2401 read_ofile_symtab (pst
);
2404 printf_filtered ("%d DIE's, sorting...", diecount
);
2406 gdb_flush (gdb_stdout
);
2408 sort_symtab_syms (pst
-> symtab
);
2409 do_cleanups (old_chain
);
2420 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2424 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2428 This is the DWARF support entry point for building a full symbol
2429 table entry from a partial symbol table entry. We are passed a
2430 pointer to the partial symbol table entry that needs to be expanded.
2435 dwarf_psymtab_to_symtab (pst
)
2436 struct partial_symtab
*pst
;
2443 warning ("psymtab for %s already read in. Shouldn't happen.",
2448 if (DBLENGTH (pst
) || pst
-> number_of_dependencies
)
2450 /* Print the message now, before starting serious work, to avoid
2451 disconcerting pauses. */
2454 printf_filtered ("Reading in symbols for %s...",
2456 gdb_flush (gdb_stdout
);
2459 psymtab_to_symtab_1 (pst
);
2461 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2462 we need to do an equivalent or is this something peculiar to
2464 Match with global symbols. This only needs to be done once,
2465 after all of the symtabs and dependencies have been read in.
2467 scan_file_globals (pst
-> objfile
);
2470 /* Finish up the verbose info message. */
2473 printf_filtered ("done.\n");
2474 gdb_flush (gdb_stdout
);
2485 init_psymbol_list -- initialize storage for partial symbols
2489 static void init_psymbol_list (struct objfile *objfile, int total_symbols)
2493 Initializes storage for all of the partial symbols that will be
2494 created by dwarf_build_psymtabs and subsidiaries.
2498 init_psymbol_list (objfile
, total_symbols
)
2499 struct objfile
*objfile
;
2502 /* Free any previously allocated psymbol lists. */
2504 if (objfile
-> global_psymbols
.list
)
2506 mfree (objfile
-> md
, (PTR
)objfile
-> global_psymbols
.list
);
2508 if (objfile
-> static_psymbols
.list
)
2510 mfree (objfile
-> md
, (PTR
)objfile
-> static_psymbols
.list
);
2513 /* Current best guess is that there are approximately a twentieth
2514 of the total symbols (in a debugging file) are global or static
2517 objfile
-> global_psymbols
.size
= total_symbols
/ 10;
2518 objfile
-> static_psymbols
.size
= total_symbols
/ 10;
2519 objfile
-> global_psymbols
.next
=
2520 objfile
-> global_psymbols
.list
= (struct partial_symbol
*)
2521 xmmalloc (objfile
-> md
, objfile
-> global_psymbols
.size
2522 * sizeof (struct partial_symbol
));
2523 objfile
-> static_psymbols
.next
=
2524 objfile
-> static_psymbols
.list
= (struct partial_symbol
*)
2525 xmmalloc (objfile
-> md
, objfile
-> static_psymbols
.size
2526 * sizeof (struct partial_symbol
));
2533 add_enum_psymbol -- add enumeration members to partial symbol table
2537 Given pointer to a DIE that is known to be for an enumeration,
2538 extract the symbolic names of the enumeration members and add
2539 partial symbols for them.
2543 add_enum_psymbol (dip
, objfile
)
2544 struct dieinfo
*dip
;
2545 struct objfile
*objfile
;
2549 unsigned short blocksz
;
2552 if ((scan
= dip
-> at_element_list
) != NULL
)
2554 if (dip
-> short_element_list
)
2556 nbytes
= attribute_size (AT_short_element_list
);
2560 nbytes
= attribute_size (AT_element_list
);
2562 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2564 listend
= scan
+ blocksz
;
2565 while (scan
< listend
)
2567 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2568 ADD_PSYMBOL_TO_LIST (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2569 objfile
-> static_psymbols
, 0, cu_language
,
2571 scan
+= strlen (scan
) + 1;
2580 add_partial_symbol -- add symbol to partial symbol table
2584 Given a DIE, if it is one of the types that we want to
2585 add to a partial symbol table, finish filling in the die info
2586 and then add a partial symbol table entry for it.
2590 The caller must ensure that the DIE has a valid name attribute.
2594 add_partial_symbol (dip
, objfile
)
2595 struct dieinfo
*dip
;
2596 struct objfile
*objfile
;
2598 switch (dip
-> die_tag
)
2600 case TAG_global_subroutine
:
2601 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2602 VAR_NAMESPACE
, LOC_BLOCK
,
2603 objfile
-> global_psymbols
,
2604 dip
-> at_low_pc
, cu_language
, objfile
);
2606 case TAG_global_variable
:
2607 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2608 VAR_NAMESPACE
, LOC_STATIC
,
2609 objfile
-> global_psymbols
,
2610 0, cu_language
, objfile
);
2612 case TAG_subroutine
:
2613 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2614 VAR_NAMESPACE
, LOC_BLOCK
,
2615 objfile
-> static_psymbols
,
2616 dip
-> at_low_pc
, cu_language
, objfile
);
2618 case TAG_local_variable
:
2619 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2620 VAR_NAMESPACE
, LOC_STATIC
,
2621 objfile
-> static_psymbols
,
2622 0, cu_language
, objfile
);
2625 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2626 VAR_NAMESPACE
, LOC_TYPEDEF
,
2627 objfile
-> static_psymbols
,
2628 0, cu_language
, objfile
);
2630 case TAG_class_type
:
2631 case TAG_structure_type
:
2632 case TAG_union_type
:
2633 case TAG_enumeration_type
:
2634 /* Do not add opaque aggregate definitions to the psymtab. */
2635 if (!dip
-> has_at_byte_size
)
2637 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2638 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2639 objfile
-> static_psymbols
,
2640 0, cu_language
, objfile
);
2641 if (cu_language
== language_cplus
)
2643 /* For C++, these implicitly act as typedefs as well. */
2644 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2645 VAR_NAMESPACE
, LOC_TYPEDEF
,
2646 objfile
-> static_psymbols
,
2647 0, cu_language
, objfile
);
2657 scan_partial_symbols -- scan DIE's within a single compilation unit
2661 Process the DIE's within a single compilation unit, looking for
2662 interesting DIE's that contribute to the partial symbol table entry
2663 for this compilation unit.
2667 There are some DIE's that may appear both at file scope and within
2668 the scope of a function. We are only interested in the ones at file
2669 scope, and the only way to tell them apart is to keep track of the
2670 scope. For example, consider the test case:
2675 for which the relevant DWARF segment has the structure:
2678 0x23 global subrtn sibling 0x9b
2680 fund_type FT_integer
2685 0x23 local var sibling 0x97
2687 fund_type FT_integer
2688 location OP_BASEREG 0xe
2695 0x1d local var sibling 0xb8
2697 fund_type FT_integer
2698 location OP_ADDR 0x800025dc
2703 We want to include the symbol 'i' in the partial symbol table, but
2704 not the symbol 'j'. In essence, we want to skip all the dies within
2705 the scope of a TAG_global_subroutine DIE.
2707 Don't attempt to add anonymous structures or unions since they have
2708 no name. Anonymous enumerations however are processed, because we
2709 want to extract their member names (the check for a tag name is
2712 Also, for variables and subroutines, check that this is the place
2713 where the actual definition occurs, rather than just a reference
2718 scan_partial_symbols (thisdie
, enddie
, objfile
)
2721 struct objfile
*objfile
;
2727 while (thisdie
< enddie
)
2729 basicdieinfo (&di
, thisdie
, objfile
);
2730 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2736 nextdie
= thisdie
+ di
.die_length
;
2737 /* To avoid getting complete die information for every die, we
2738 only do it (below) for the cases we are interested in. */
2741 case TAG_global_subroutine
:
2742 case TAG_subroutine
:
2743 completedieinfo (&di
, objfile
);
2744 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2746 add_partial_symbol (&di
, objfile
);
2747 /* If there is a sibling attribute, adjust the nextdie
2748 pointer to skip the entire scope of the subroutine.
2749 Apply some sanity checking to make sure we don't
2750 overrun or underrun the range of remaining DIE's */
2751 if (di
.at_sibling
!= 0)
2753 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2754 if ((temp
< thisdie
) || (temp
>= enddie
))
2756 complain (&bad_die_ref
, DIE_ID
, DIE_NAME
,
2766 case TAG_global_variable
:
2767 case TAG_local_variable
:
2768 completedieinfo (&di
, objfile
);
2769 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2771 add_partial_symbol (&di
, objfile
);
2775 case TAG_class_type
:
2776 case TAG_structure_type
:
2777 case TAG_union_type
:
2778 completedieinfo (&di
, objfile
);
2781 add_partial_symbol (&di
, objfile
);
2784 case TAG_enumeration_type
:
2785 completedieinfo (&di
, objfile
);
2788 add_partial_symbol (&di
, objfile
);
2790 add_enum_psymbol (&di
, objfile
);
2802 scan_compilation_units -- build a psymtab entry for each compilation
2806 This is the top level dwarf parsing routine for building partial
2809 It scans from the beginning of the DWARF table looking for the first
2810 TAG_compile_unit DIE, and then follows the sibling chain to locate
2811 each additional TAG_compile_unit DIE.
2813 For each TAG_compile_unit DIE it creates a partial symtab structure,
2814 calls a subordinate routine to collect all the compilation unit's
2815 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2816 new partial symtab structure into the partial symbol table. It also
2817 records the appropriate information in the partial symbol table entry
2818 to allow the chunk of DIE's and line number table for this compilation
2819 unit to be located and re-read later, to generate a complete symbol
2820 table entry for the compilation unit.
2822 Thus it effectively partitions up a chunk of DIE's for multiple
2823 compilation units into smaller DIE chunks and line number tables,
2824 and associates them with a partial symbol table entry.
2828 If any compilation unit has no line number table associated with
2829 it for some reason (a missing at_stmt_list attribute, rather than
2830 just one with a value of zero, which is valid) then we ensure that
2831 the recorded file offset is zero so that the routine which later
2832 reads line number table fragments knows that there is no fragment
2842 scan_compilation_units (thisdie
, enddie
, dbfoff
, lnoffset
, objfile
)
2847 struct objfile
*objfile
;
2851 struct partial_symtab
*pst
;
2854 file_ptr curlnoffset
;
2856 while (thisdie
< enddie
)
2858 basicdieinfo (&di
, thisdie
, objfile
);
2859 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2863 else if (di
.die_tag
!= TAG_compile_unit
)
2865 nextdie
= thisdie
+ di
.die_length
;
2869 completedieinfo (&di
, objfile
);
2870 set_cu_language (&di
);
2871 if (di
.at_sibling
!= 0)
2873 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2877 nextdie
= thisdie
+ di
.die_length
;
2879 curoff
= thisdie
- dbbase
;
2880 culength
= nextdie
- thisdie
;
2881 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2883 /* First allocate a new partial symbol table structure */
2885 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2886 di
.at_name
, di
.at_low_pc
,
2887 objfile
-> global_psymbols
.next
,
2888 objfile
-> static_psymbols
.next
);
2890 pst
-> texthigh
= di
.at_high_pc
;
2891 pst
-> read_symtab_private
= (char *)
2892 obstack_alloc (&objfile
-> psymbol_obstack
,
2893 sizeof (struct dwfinfo
));
2894 DBFOFF (pst
) = dbfoff
;
2895 DBROFF (pst
) = curoff
;
2896 DBLENGTH (pst
) = culength
;
2897 LNFOFF (pst
) = curlnoffset
;
2898 pst
-> read_symtab
= dwarf_psymtab_to_symtab
;
2900 /* Now look for partial symbols */
2902 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2904 pst
-> n_global_syms
= objfile
-> global_psymbols
.next
-
2905 (objfile
-> global_psymbols
.list
+ pst
-> globals_offset
);
2906 pst
-> n_static_syms
= objfile
-> static_psymbols
.next
-
2907 (objfile
-> static_psymbols
.list
+ pst
-> statics_offset
);
2908 sort_pst_symbols (pst
);
2909 /* If there is already a psymtab or symtab for a file of this name,
2910 remove it. (If there is a symtab, more drastic things also
2911 happen.) This happens in VxWorks. */
2912 free_named_symtabs (pst
-> filename
);
2922 new_symbol -- make a symbol table entry for a new symbol
2926 static struct symbol *new_symbol (struct dieinfo *dip,
2927 struct objfile *objfile)
2931 Given a pointer to a DWARF information entry, figure out if we need
2932 to make a symbol table entry for it, and if so, create a new entry
2933 and return a pointer to it.
2936 static struct symbol
*
2937 new_symbol (dip
, objfile
)
2938 struct dieinfo
*dip
;
2939 struct objfile
*objfile
;
2941 struct symbol
*sym
= NULL
;
2943 if (dip
-> at_name
!= NULL
)
2945 sym
= (struct symbol
*) obstack_alloc (&objfile
-> symbol_obstack
,
2946 sizeof (struct symbol
));
2947 memset (sym
, 0, sizeof (struct symbol
));
2948 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2949 &objfile
->symbol_obstack
);
2950 /* default assumptions */
2951 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2952 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2953 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2955 /* If this symbol is from a C++ compilation, then attempt to cache the
2956 demangled form for future reference. This is a typical time versus
2957 space tradeoff, that was decided in favor of time because it sped up
2958 C++ symbol lookups by a factor of about 20. */
2960 SYMBOL_LANGUAGE (sym
) = cu_language
;
2961 SYMBOL_INIT_DEMANGLED_NAME (sym
, &objfile
-> symbol_obstack
);
2962 switch (dip
-> die_tag
)
2965 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2966 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2968 case TAG_global_subroutine
:
2969 case TAG_subroutine
:
2970 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2971 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2972 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2973 if (dip
-> die_tag
== TAG_global_subroutine
)
2975 add_symbol_to_list (sym
, &global_symbols
);
2979 add_symbol_to_list (sym
, list_in_scope
);
2982 case TAG_global_variable
:
2983 if (dip
-> at_location
!= NULL
)
2985 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2986 add_symbol_to_list (sym
, &global_symbols
);
2987 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2988 SYMBOL_VALUE (sym
) += baseaddr
;
2991 case TAG_local_variable
:
2992 if (dip
-> at_location
!= NULL
)
2994 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2995 add_symbol_to_list (sym
, list_in_scope
);
2998 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
3002 SYMBOL_CLASS (sym
) = LOC_BASEREG
;
3003 SYMBOL_BASEREG (sym
) = basereg
;
3007 SYMBOL_CLASS (sym
) = LOC_STATIC
;
3008 SYMBOL_VALUE (sym
) += baseaddr
;
3012 case TAG_formal_parameter
:
3013 if (dip
-> at_location
!= NULL
)
3015 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
3017 add_symbol_to_list (sym
, list_in_scope
);
3020 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
3024 SYMBOL_CLASS (sym
) = LOC_BASEREG_ARG
;
3025 SYMBOL_BASEREG (sym
) = basereg
;
3029 SYMBOL_CLASS (sym
) = LOC_ARG
;
3032 case TAG_unspecified_parameters
:
3033 /* From varargs functions; gdb doesn't seem to have any interest in
3034 this information, so just ignore it for now. (FIXME?) */
3036 case TAG_class_type
:
3037 case TAG_structure_type
:
3038 case TAG_union_type
:
3039 case TAG_enumeration_type
:
3040 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3041 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
3042 add_symbol_to_list (sym
, list_in_scope
);
3045 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3046 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3047 add_symbol_to_list (sym
, list_in_scope
);
3050 /* Not a tag we recognize. Hopefully we aren't processing trash
3051 data, but since we must specifically ignore things we don't
3052 recognize, there is nothing else we should do at this point. */
3063 synthesize_typedef -- make a symbol table entry for a "fake" typedef
3067 static void synthesize_typedef (struct dieinfo *dip,
3068 struct objfile *objfile,
3073 Given a pointer to a DWARF information entry, synthesize a typedef
3074 for the name in the DIE, using the specified type.
3076 This is used for C++ class, structs, unions, and enumerations to
3077 set up the tag name as a type.
3082 synthesize_typedef (dip
, objfile
, type
)
3083 struct dieinfo
*dip
;
3084 struct objfile
*objfile
;
3087 struct symbol
*sym
= NULL
;
3089 if (dip
-> at_name
!= NULL
)
3091 sym
= (struct symbol
*)
3092 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symbol
));
3093 memset (sym
, 0, sizeof (struct symbol
));
3094 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
3095 &objfile
->symbol_obstack
);
3096 SYMBOL_INIT_LANGUAGE_SPECIFIC (sym
, cu_language
);
3097 SYMBOL_TYPE (sym
) = type
;
3098 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
3099 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
3100 add_symbol_to_list (sym
, list_in_scope
);
3108 decode_mod_fund_type -- decode a modified fundamental type
3112 static struct type *decode_mod_fund_type (char *typedata)
3116 Decode a block of data containing a modified fundamental
3117 type specification. TYPEDATA is a pointer to the block,
3118 which starts with a length containing the size of the rest
3119 of the block. At the end of the block is a fundmental type
3120 code value that gives the fundamental type. Everything
3121 in between are type modifiers.
3123 We simply compute the number of modifiers and call the general
3124 function decode_modified_type to do the actual work.
3127 static struct type
*
3128 decode_mod_fund_type (typedata
)
3131 struct type
*typep
= NULL
;
3132 unsigned short modcount
;
3135 /* Get the total size of the block, exclusive of the size itself */
3137 nbytes
= attribute_size (AT_mod_fund_type
);
3138 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3141 /* Deduct the size of the fundamental type bytes at the end of the block. */
3143 modcount
-= attribute_size (AT_fund_type
);
3145 /* Now do the actual decoding */
3147 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3155 decode_mod_u_d_type -- decode a modified user defined type
3159 static struct type *decode_mod_u_d_type (char *typedata)
3163 Decode a block of data containing a modified user defined
3164 type specification. TYPEDATA is a pointer to the block,
3165 which consists of a two byte length, containing the size
3166 of the rest of the block. At the end of the block is a
3167 four byte value that gives a reference to a user defined type.
3168 Everything in between are type modifiers.
3170 We simply compute the number of modifiers and call the general
3171 function decode_modified_type to do the actual work.
3174 static struct type
*
3175 decode_mod_u_d_type (typedata
)
3178 struct type
*typep
= NULL
;
3179 unsigned short modcount
;
3182 /* Get the total size of the block, exclusive of the size itself */
3184 nbytes
= attribute_size (AT_mod_u_d_type
);
3185 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3188 /* Deduct the size of the reference type bytes at the end of the block. */
3190 modcount
-= attribute_size (AT_user_def_type
);
3192 /* Now do the actual decoding */
3194 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3202 decode_modified_type -- decode modified user or fundamental type
3206 static struct type *decode_modified_type (char *modifiers,
3207 unsigned short modcount, int mtype)
3211 Decode a modified type, either a modified fundamental type or
3212 a modified user defined type. MODIFIERS is a pointer to the
3213 block of bytes that define MODCOUNT modifiers. Immediately
3214 following the last modifier is a short containing the fundamental
3215 type or a long containing the reference to the user defined
3216 type. Which one is determined by MTYPE, which is either
3217 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3218 type we are generating.
3220 We call ourself recursively to generate each modified type,`
3221 until MODCOUNT reaches zero, at which point we have consumed
3222 all the modifiers and generate either the fundamental type or
3223 user defined type. When the recursion unwinds, each modifier
3224 is applied in turn to generate the full modified type.
3228 If we find a modifier that we don't recognize, and it is not one
3229 of those reserved for application specific use, then we issue a
3230 warning and simply ignore the modifier.
3234 We currently ignore MOD_const and MOD_volatile. (FIXME)
3238 static struct type
*
3239 decode_modified_type (modifiers
, modcount
, mtype
)
3241 unsigned int modcount
;
3244 struct type
*typep
= NULL
;
3245 unsigned short fundtype
;
3254 case AT_mod_fund_type
:
3255 nbytes
= attribute_size (AT_fund_type
);
3256 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3258 typep
= decode_fund_type (fundtype
);
3260 case AT_mod_u_d_type
:
3261 nbytes
= attribute_size (AT_user_def_type
);
3262 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3264 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3266 typep
= alloc_utype (die_ref
, NULL
);
3270 complain (&botched_modified_type
, DIE_ID
, DIE_NAME
, mtype
);
3271 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3277 modifier
= *modifiers
++;
3278 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3281 case MOD_pointer_to
:
3282 typep
= lookup_pointer_type (typep
);
3284 case MOD_reference_to
:
3285 typep
= lookup_reference_type (typep
);
3288 complain (&const_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3291 complain (&volatile_ignored
, DIE_ID
, DIE_NAME
); /* FIXME */
3294 if (!(MOD_lo_user
<= (unsigned char) modifier
3295 && (unsigned char) modifier
<= MOD_hi_user
))
3297 complain (&unknown_type_modifier
, DIE_ID
, DIE_NAME
, modifier
);
3309 decode_fund_type -- translate basic DWARF type to gdb base type
3313 Given an integer that is one of the fundamental DWARF types,
3314 translate it to one of the basic internal gdb types and return
3315 a pointer to the appropriate gdb type (a "struct type *").
3319 For robustness, if we are asked to translate a fundamental
3320 type that we are unprepared to deal with, we return int so
3321 callers can always depend upon a valid type being returned,
3322 and so gdb may at least do something reasonable by default.
3323 If the type is not in the range of those types defined as
3324 application specific types, we also issue a warning.
3327 static struct type
*
3328 decode_fund_type (fundtype
)
3329 unsigned int fundtype
;
3331 struct type
*typep
= NULL
;
3337 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3340 case FT_boolean
: /* Was FT_set in AT&T version */
3341 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3344 case FT_pointer
: /* (void *) */
3345 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3346 typep
= lookup_pointer_type (typep
);
3350 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3353 case FT_signed_char
:
3354 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3357 case FT_unsigned_char
:
3358 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3362 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3365 case FT_signed_short
:
3366 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3369 case FT_unsigned_short
:
3370 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3374 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3377 case FT_signed_integer
:
3378 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3381 case FT_unsigned_integer
:
3382 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3386 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3389 case FT_signed_long
:
3390 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3393 case FT_unsigned_long
:
3394 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3398 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3401 case FT_signed_long_long
:
3402 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3405 case FT_unsigned_long_long
:
3406 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3410 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3413 case FT_dbl_prec_float
:
3414 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3417 case FT_ext_prec_float
:
3418 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3422 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3425 case FT_dbl_prec_complex
:
3426 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3429 case FT_ext_prec_complex
:
3430 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3437 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3438 if (!(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3440 complain (&unexpected_fund_type
, DIE_ID
, DIE_NAME
, fundtype
);
3451 create_name -- allocate a fresh copy of a string on an obstack
3455 Given a pointer to a string and a pointer to an obstack, allocates
3456 a fresh copy of the string on the specified obstack.
3461 create_name (name
, obstackp
)
3463 struct obstack
*obstackp
;
3468 length
= strlen (name
) + 1;
3469 newname
= (char *) obstack_alloc (obstackp
, length
);
3470 strcpy (newname
, name
);
3478 basicdieinfo -- extract the minimal die info from raw die data
3482 void basicdieinfo (char *diep, struct dieinfo *dip,
3483 struct objfile *objfile)
3487 Given a pointer to raw DIE data, and a pointer to an instance of a
3488 die info structure, this function extracts the basic information
3489 from the DIE data required to continue processing this DIE, along
3490 with some bookkeeping information about the DIE.
3492 The information we absolutely must have includes the DIE tag,
3493 and the DIE length. If we need the sibling reference, then we
3494 will have to call completedieinfo() to process all the remaining
3497 Note that since there is no guarantee that the data is properly
3498 aligned in memory for the type of access required (indirection
3499 through anything other than a char pointer), and there is no
3500 guarantee that it is in the same byte order as the gdb host,
3501 we call a function which deals with both alignment and byte
3502 swapping issues. Possibly inefficient, but quite portable.
3504 We also take care of some other basic things at this point, such
3505 as ensuring that the instance of the die info structure starts
3506 out completely zero'd and that curdie is initialized for use
3507 in error reporting if we have a problem with the current die.
3511 All DIE's must have at least a valid length, thus the minimum
3512 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3513 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3514 are forced to be TAG_padding DIES.
3516 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3517 that if a padding DIE is used for alignment and the amount needed is
3518 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3519 enough to align to the next alignment boundry.
3521 We do some basic sanity checking here, such as verifying that the
3522 length of the die would not cause it to overrun the recorded end of
3523 the buffer holding the DIE info. If we find a DIE that is either
3524 too small or too large, we force it's length to zero which should
3525 cause the caller to take appropriate action.
3529 basicdieinfo (dip
, diep
, objfile
)
3530 struct dieinfo
*dip
;
3532 struct objfile
*objfile
;
3535 memset (dip
, 0, sizeof (struct dieinfo
));
3537 dip
-> die_ref
= dbroff
+ (diep
- dbbase
);
3538 dip
-> die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3540 if ((dip
-> die_length
< SIZEOF_DIE_LENGTH
) ||
3541 ((diep
+ dip
-> die_length
) > (dbbase
+ dbsize
)))
3543 complain (&malformed_die
, DIE_ID
, DIE_NAME
, dip
-> die_length
);
3544 dip
-> die_length
= 0;
3546 else if (dip
-> die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3548 dip
-> die_tag
= TAG_padding
;
3552 diep
+= SIZEOF_DIE_LENGTH
;
3553 dip
-> die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3562 completedieinfo -- finish reading the information for a given DIE
3566 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3570 Given a pointer to an already partially initialized die info structure,
3571 scan the raw DIE data and finish filling in the die info structure
3572 from the various attributes found.
3574 Note that since there is no guarantee that the data is properly
3575 aligned in memory for the type of access required (indirection
3576 through anything other than a char pointer), and there is no
3577 guarantee that it is in the same byte order as the gdb host,
3578 we call a function which deals with both alignment and byte
3579 swapping issues. Possibly inefficient, but quite portable.
3583 Each time we are called, we increment the diecount variable, which
3584 keeps an approximate count of the number of dies processed for
3585 each compilation unit. This information is presented to the user
3586 if the info_verbose flag is set.
3591 completedieinfo (dip
, objfile
)
3592 struct dieinfo
*dip
;
3593 struct objfile
*objfile
;
3595 char *diep
; /* Current pointer into raw DIE data */
3596 char *end
; /* Terminate DIE scan here */
3597 unsigned short attr
; /* Current attribute being scanned */
3598 unsigned short form
; /* Form of the attribute */
3599 int nbytes
; /* Size of next field to read */
3603 end
= diep
+ dip
-> die_length
;
3604 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3607 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3608 diep
+= SIZEOF_ATTRIBUTE
;
3609 if ((nbytes
= attribute_size (attr
)) == -1)
3611 complain (&unknown_attribute_length
, DIE_ID
, DIE_NAME
);
3618 dip
-> at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3622 dip
-> at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3626 dip
-> at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3630 dip
-> at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3634 dip
-> at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3636 dip
-> has_at_stmt_list
= 1;
3639 dip
-> at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3641 dip
-> at_low_pc
+= baseaddr
;
3642 dip
-> has_at_low_pc
= 1;
3645 dip
-> at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3647 dip
-> at_high_pc
+= baseaddr
;
3650 dip
-> at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3653 case AT_user_def_type
:
3654 dip
-> at_user_def_type
= target_to_host (diep
, nbytes
,
3655 GET_UNSIGNED
, objfile
);
3658 dip
-> at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3660 dip
-> has_at_byte_size
= 1;
3663 dip
-> at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3667 dip
-> at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3671 dip
-> at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3675 dip
-> at_location
= diep
;
3677 case AT_mod_fund_type
:
3678 dip
-> at_mod_fund_type
= diep
;
3680 case AT_subscr_data
:
3681 dip
-> at_subscr_data
= diep
;
3683 case AT_mod_u_d_type
:
3684 dip
-> at_mod_u_d_type
= diep
;
3686 case AT_element_list
:
3687 dip
-> at_element_list
= diep
;
3688 dip
-> short_element_list
= 0;
3690 case AT_short_element_list
:
3691 dip
-> at_element_list
= diep
;
3692 dip
-> short_element_list
= 1;
3694 case AT_discr_value
:
3695 dip
-> at_discr_value
= diep
;
3697 case AT_string_length
:
3698 dip
-> at_string_length
= diep
;
3701 dip
-> at_name
= diep
;
3704 /* For now, ignore any "hostname:" portion, since gdb doesn't
3705 know how to deal with it. (FIXME). */
3706 dip
-> at_comp_dir
= strrchr (diep
, ':');
3707 if (dip
-> at_comp_dir
!= NULL
)
3709 dip
-> at_comp_dir
++;
3713 dip
-> at_comp_dir
= diep
;
3717 dip
-> at_producer
= diep
;
3719 case AT_start_scope
:
3720 dip
-> at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3723 case AT_stride_size
:
3724 dip
-> at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3728 dip
-> at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3732 dip
-> at_prototyped
= diep
;
3735 /* Found an attribute that we are unprepared to handle. However
3736 it is specifically one of the design goals of DWARF that
3737 consumers should ignore unknown attributes. As long as the
3738 form is one that we recognize (so we know how to skip it),
3739 we can just ignore the unknown attribute. */
3742 form
= FORM_FROM_ATTR (attr
);
3756 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3759 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3762 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3765 diep
+= strlen (diep
) + 1;
3768 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);
3779 target_to_host -- swap in target data to host
3783 target_to_host (char *from, int nbytes, int signextend,
3784 struct objfile *objfile)
3788 Given pointer to data in target format in FROM, a byte count for
3789 the size of the data in NBYTES, a flag indicating whether or not
3790 the data is signed in SIGNEXTEND, and a pointer to the current
3791 objfile in OBJFILE, convert the data to host format and return
3792 the converted value.
3796 FIXME: If we read data that is known to be signed, and expect to
3797 use it as signed data, then we need to explicitly sign extend the
3798 result until the bfd library is able to do this for us.
3800 FIXME: Would a 32 bit target ever need an 8 byte result?
3805 target_to_host (from
, nbytes
, signextend
, objfile
)
3808 int signextend
; /* FIXME: Unused */
3809 struct objfile
*objfile
;
3816 rtnval
= bfd_get_64 (objfile
-> obfd
, (bfd_byte
*) from
);
3819 rtnval
= bfd_get_32 (objfile
-> obfd
, (bfd_byte
*) from
);
3822 rtnval
= bfd_get_16 (objfile
-> obfd
, (bfd_byte
*) from
);
3825 rtnval
= bfd_get_8 (objfile
-> obfd
, (bfd_byte
*) from
);
3828 complain (&no_bfd_get_N
, DIE_ID
, DIE_NAME
, nbytes
);
3839 attribute_size -- compute size of data for a DWARF attribute
3843 static int attribute_size (unsigned int attr)
3847 Given a DWARF attribute in ATTR, compute the size of the first
3848 piece of data associated with this attribute and return that
3851 Returns -1 for unrecognized attributes.
3856 attribute_size (attr
)
3859 int nbytes
; /* Size of next data for this attribute */
3860 unsigned short form
; /* Form of the attribute */
3862 form
= FORM_FROM_ATTR (attr
);
3865 case FORM_STRING
: /* A variable length field is next */
3868 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3869 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3872 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3873 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3874 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3877 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3880 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3881 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3884 complain (&unknown_attribute_form
, DIE_ID
, DIE_NAME
, form
);