1 /* DWARF debugging format support for GDB.
2 Copyright (C) 1991, 1992 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: Figure out how to get the frame pointer register number in the
25 execution environment of the target. Remove R_FP kludge
27 FIXME: Add generation of dependencies list to partial symtab code.
29 FIXME: Resolve minor differences between what information we put in the
30 partial symbol table and what dbxread puts in. For example, we don't yet
31 put enum constants there. And dbxread seems to invent a lot of typedefs
32 we never see. Use the new printpsym command to see the partial symbol table
35 FIXME: Figure out a better way to tell gdb about the name of the function
36 contain the user's entry point (I.E. main())
38 FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
39 other things to work on, if you get bored. :-)
49 #include "libbfd.h" /* FIXME Secret Internal BFD stuff (bfd_read) */
50 #include "elf/dwarf.h"
53 #include "expression.h" /* Needed for enum exp_opcode in language.h, sigh... */
59 #include <sys/types.h>
64 /* FIXME -- convert this to SEEK_SET a la POSIX, move to config files. */
69 #ifdef MAINTENANCE /* Define to 1 to compile in some maintenance stuff */
70 #define SQUAWK(stuff) dwarfwarn stuff
75 #ifndef R_FP /* FIXME */
76 #define R_FP 14 /* Kludge to get frame pointer register number */
79 typedef unsigned int DIE_REF
; /* Reference to a DIE */
82 #define GCC_PRODUCER "GNU C "
85 #ifndef GPLUS_PRODUCER
86 #define GPLUS_PRODUCER "GNU C++ "
90 #define LCC_PRODUCER "NCR C/C++"
93 #ifndef CFRONT_PRODUCER
94 #define CFRONT_PRODUCER "CFRONT " /* A wild a** guess... */
97 /* start-sanitize-chill */
98 #ifndef CHILL_PRODUCER
99 #define CHILL_PRODUCER "GNU Chill "
101 /* end-sanitize-chill */
103 #define STREQ(a,b) (strcmp(a,b)==0)
104 #define STREQN(a,b,n) (strncmp(a,b,n)==0)
106 /* Flags to target_to_host() that tell whether or not the data object is
107 expected to be signed. Used, for example, when fetching a signed
108 integer in the target environment which is used as a signed integer
109 in the host environment, and the two environments have different sized
110 ints. In this case, *somebody* has to sign extend the smaller sized
113 #define GET_UNSIGNED 0 /* No sign extension required */
114 #define GET_SIGNED 1 /* Sign extension required */
116 /* Defines for things which are specified in the document "DWARF Debugging
117 Information Format" published by UNIX International, Programming Languages
118 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
120 #define SIZEOF_DIE_LENGTH 4
121 #define SIZEOF_DIE_TAG 2
122 #define SIZEOF_ATTRIBUTE 2
123 #define SIZEOF_FORMAT_SPECIFIER 1
124 #define SIZEOF_FMT_FT 2
125 #define SIZEOF_LINETBL_LENGTH 4
126 #define SIZEOF_LINETBL_LINENO 4
127 #define SIZEOF_LINETBL_STMT 2
128 #define SIZEOF_LINETBL_DELTA 4
129 #define SIZEOF_LOC_ATOM_CODE 1
131 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
133 /* Macros that return the sizes of various types of data in the target
136 FIXME: Currently these are just compile time constants (as they are in
137 other parts of gdb as well). They need to be able to get the right size
138 either from the bfd or possibly from the DWARF info. It would be nice if
139 the DWARF producer inserted DIES that describe the fundamental types in
140 the target environment into the DWARF info, similar to the way dbx stabs
141 producers produce information about their fundamental types. */
143 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
144 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
146 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
147 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
148 However, the Issue 2 DWARF specification from AT&T defines it as
149 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
150 For backwards compatibility with the AT&T compiler produced executables
151 we define AT_short_element_list for this variant. */
153 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
155 /* External variables referenced. */
157 extern int info_verbose
; /* From main.c; nonzero => verbose */
158 extern char *warning_pre_print
; /* From utils.c */
160 /* The DWARF debugging information consists of two major pieces,
161 one is a block of DWARF Information Entries (DIE's) and the other
162 is a line number table. The "struct dieinfo" structure contains
163 the information for a single DIE, the one currently being processed.
165 In order to make it easier to randomly access the attribute fields
166 of the current DIE, which are specifically unordered within the DIE,
167 each DIE is scanned and an instance of the "struct dieinfo"
168 structure is initialized.
170 Initialization is done in two levels. The first, done by basicdieinfo(),
171 just initializes those fields that are vital to deciding whether or not
172 to use this DIE, how to skip past it, etc. The second, done by the
173 function completedieinfo(), fills in the rest of the information.
175 Attributes which have block forms are not interpreted at the time
176 the DIE is scanned, instead we just save pointers to the start
177 of their value fields.
179 Some fields have a flag <name>_p that is set when the value of the
180 field is valid (I.E. we found a matching attribute in the DIE). Since
181 we may want to test for the presence of some attributes in the DIE,
182 such as AT_low_pc, without restricting the values of the field,
183 we need someway to note that we found such an attribute.
190 char * die
; /* Pointer to the raw DIE data */
191 unsigned long die_length
; /* Length of the raw DIE data */
192 DIE_REF die_ref
; /* Offset of this DIE */
193 unsigned short die_tag
; /* Tag for this DIE */
194 unsigned long at_padding
;
195 unsigned long at_sibling
;
198 unsigned short at_fund_type
;
199 BLOCK
* at_mod_fund_type
;
200 unsigned long at_user_def_type
;
201 BLOCK
* at_mod_u_d_type
;
202 unsigned short at_ordering
;
203 BLOCK
* at_subscr_data
;
204 unsigned long at_byte_size
;
205 unsigned short at_bit_offset
;
206 unsigned long at_bit_size
;
207 BLOCK
* at_element_list
;
208 unsigned long at_stmt_list
;
209 unsigned long at_low_pc
;
210 unsigned long at_high_pc
;
211 unsigned long at_language
;
212 unsigned long at_member
;
213 unsigned long at_discr
;
214 BLOCK
* at_discr_value
;
215 BLOCK
* at_string_length
;
218 unsigned long at_start_scope
;
219 unsigned long at_stride_size
;
220 unsigned long at_src_info
;
221 char * at_prototyped
;
222 unsigned int has_at_low_pc
:1;
223 unsigned int has_at_stmt_list
:1;
224 unsigned int has_at_byte_size
:1;
225 unsigned int short_element_list
:1;
228 static int diecount
; /* Approximate count of dies for compilation unit */
229 static struct dieinfo
*curdie
; /* For warnings and such */
231 static char *dbbase
; /* Base pointer to dwarf info */
232 static int dbsize
; /* Size of dwarf info in bytes */
233 static int dbroff
; /* Relative offset from start of .debug section */
234 static char *lnbase
; /* Base pointer to line section */
235 static int isreg
; /* Kludge to identify register variables */
236 static int offreg
; /* Kludge to identify basereg references */
238 /* This value is added to each symbol value. FIXME: Generalize to
239 the section_offsets structure used by dbxread. */
240 static CORE_ADDR baseaddr
; /* Add to each symbol value */
242 /* The section offsets used in the current psymtab or symtab. FIXME,
243 only used to pass one value (baseaddr) at the moment. */
244 static struct section_offsets
*base_section_offsets
;
246 /* Each partial symbol table entry contains a pointer to private data for the
247 read_symtab() function to use when expanding a partial symbol table entry
248 to a full symbol table entry. For DWARF debugging info, this data is
249 contained in the following structure and macros are provided for easy
250 access to the members given a pointer to a partial symbol table entry.
252 dbfoff Always the absolute file offset to the start of the ".debug"
253 section for the file containing the DIE's being accessed.
255 dbroff Relative offset from the start of the ".debug" access to the
256 first DIE to be accessed. When building the partial symbol
257 table, this value will be zero since we are accessing the
258 entire ".debug" section. When expanding a partial symbol
259 table entry, this value will be the offset to the first
260 DIE for the compilation unit containing the symbol that
261 triggers the expansion.
263 dblength The size of the chunk of DIE's being examined, in bytes.
265 lnfoff The absolute file offset to the line table fragment. Ignored
266 when building partial symbol tables, but used when expanding
267 them, and contains the absolute file offset to the fragment
268 of the ".line" section containing the line numbers for the
269 current compilation unit.
273 file_ptr dbfoff
; /* Absolute file offset to start of .debug section */
274 int dbroff
; /* Relative offset from start of .debug section */
275 int dblength
; /* Size of the chunk of DIE's being examined */
276 file_ptr lnfoff
; /* Absolute file offset to line table fragment */
279 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
280 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
281 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
282 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
284 /* The generic symbol table building routines have separate lists for
285 file scope symbols and all all other scopes (local scopes). So
286 we need to select the right one to pass to add_symbol_to_list().
287 We do it by keeping a pointer to the correct list in list_in_scope.
289 FIXME: The original dwarf code just treated the file scope as the first
290 local scope, and all other local scopes as nested local scopes, and worked
291 fine. Check to see if we really need to distinguish these in buildsym.c */
293 struct pending
**list_in_scope
= &file_symbols
;
295 /* DIES which have user defined types or modified user defined types refer to
296 other DIES for the type information. Thus we need to associate the offset
297 of a DIE for a user defined type with a pointer to the type information.
299 Originally this was done using a simple but expensive algorithm, with an
300 array of unsorted structures, each containing an offset/type-pointer pair.
301 This array was scanned linearly each time a lookup was done. The result
302 was that gdb was spending over half it's startup time munging through this
303 array of pointers looking for a structure that had the right offset member.
305 The second attempt used the same array of structures, but the array was
306 sorted using qsort each time a new offset/type was recorded, and a binary
307 search was used to find the type pointer for a given DIE offset. This was
308 even slower, due to the overhead of sorting the array each time a new
309 offset/type pair was entered.
311 The third attempt uses a fixed size array of type pointers, indexed by a
312 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
313 we can divide any DIE offset by 4 to obtain a unique index into this fixed
314 size array. Since each element is a 4 byte pointer, it takes exactly as
315 much memory to hold this array as to hold the DWARF info for a given
316 compilation unit. But it gets freed as soon as we are done with it.
317 This has worked well in practice, as a reasonable tradeoff between memory
318 consumption and speed, without having to resort to much more complicated
321 static struct type
**utypes
; /* Pointer to array of user type pointers */
322 static int numutypes
; /* Max number of user type pointers */
324 /* Maintain an array of referenced fundamental types for the current
325 compilation unit being read. For DWARF version 1, we have to construct
326 the fundamental types on the fly, since no information about the
327 fundamental types is supplied. Each such fundamental type is created by
328 calling a language dependent routine to create the type, and then a
329 pointer to that type is then placed in the array at the index specified
330 by it's FT_<TYPENAME> value. The array has a fixed size set by the
331 FT_NUM_MEMBERS compile time constant, which is the number of predefined
332 fundamental types gdb knows how to construct. */
334 static struct type
*ftypes
[FT_NUM_MEMBERS
]; /* Fundamental types */
336 /* Record the language for the compilation unit which is currently being
337 processed. We know it once we have seen the TAG_compile_unit DIE,
338 and we need it while processing the DIE's for that compilation unit.
339 It is eventually saved in the symtab structure, but we don't finalize
340 the symtab struct until we have processed all the DIE's for the
341 compilation unit. We also need to get and save a pointer to the
342 language struct for this language, so we can call the language
343 dependent routines for doing things such as creating fundamental
346 static enum language cu_language
;
347 static const struct language_defn
*cu_language_defn
;
349 /* Forward declarations of static functions so we don't have to worry
350 about ordering within this file. */
353 attribute_size
PARAMS ((unsigned int));
356 target_to_host
PARAMS ((char *, int, int, struct objfile
*));
359 add_enum_psymbol
PARAMS ((struct dieinfo
*, struct objfile
*));
362 handle_producer
PARAMS ((char *));
365 read_file_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
368 read_func_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
371 read_lexical_block_scope
PARAMS ((struct dieinfo
*, char *, char *,
378 scan_partial_symbols
PARAMS ((char *, char *, struct objfile
*));
381 scan_compilation_units
PARAMS ((char *, char *, file_ptr
,
382 file_ptr
, struct objfile
*));
385 add_partial_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
388 init_psymbol_list
PARAMS ((struct objfile
*, int));
391 basicdieinfo
PARAMS ((struct dieinfo
*, char *, struct objfile
*));
394 completedieinfo
PARAMS ((struct dieinfo
*, struct objfile
*));
397 dwarf_psymtab_to_symtab
PARAMS ((struct partial_symtab
*));
400 psymtab_to_symtab_1
PARAMS ((struct partial_symtab
*));
402 static struct symtab
*
403 read_ofile_symtab
PARAMS ((struct partial_symtab
*));
406 process_dies
PARAMS ((char *, char *, struct objfile
*));
409 read_structure_scope
PARAMS ((struct dieinfo
*, char *, char *,
413 decode_array_element_type
PARAMS ((char *));
416 decode_subscr_data
PARAMS ((char *, char *));
419 dwarf_read_array_type
PARAMS ((struct dieinfo
*));
422 read_tag_pointer_type
PARAMS ((struct dieinfo
*dip
));
425 read_subroutine_type
PARAMS ((struct dieinfo
*, char *, char *));
428 read_enumeration
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
431 struct_type
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
434 enum_type
PARAMS ((struct dieinfo
*, struct objfile
*));
437 decode_line_numbers
PARAMS ((char *));
440 decode_die_type
PARAMS ((struct dieinfo
*));
443 decode_mod_fund_type
PARAMS ((char *));
446 decode_mod_u_d_type
PARAMS ((char *));
449 decode_modified_type
PARAMS ((char *, unsigned int, int));
452 decode_fund_type
PARAMS ((unsigned int));
455 create_name
PARAMS ((char *, struct obstack
*));
458 lookup_utype
PARAMS ((DIE_REF
));
461 alloc_utype
PARAMS ((DIE_REF
, struct type
*));
463 static struct symbol
*
464 new_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
467 synthesize_typedef
PARAMS ((struct dieinfo
*, struct objfile
*,
471 locval
PARAMS ((char *));
474 record_minimal_symbol
PARAMS ((char *, CORE_ADDR
, enum minimal_symbol_type
,
478 set_cu_language
PARAMS ((struct dieinfo
*));
481 dwarf_fundamental_type
PARAMS ((struct objfile
*, int));
488 dwarf_fundamental_type -- lookup or create a fundamental type
493 dwarf_fundamental_type (struct objfile *objfile, int typeid)
497 DWARF version 1 doesn't supply any fundamental type information,
498 so gdb has to construct such types. It has a fixed number of
499 fundamental types that it knows how to construct, which is the
500 union of all types that it knows how to construct for all languages
501 that it knows about. These are enumerated in gdbtypes.h.
503 As an example, assume we find a DIE that references a DWARF
504 fundamental type of FT_integer. We first look in the ftypes
505 array to see if we already have such a type, indexed by the
506 gdb internal value of FT_INTEGER. If so, we simply return a
507 pointer to that type. If not, then we ask an appropriate
508 language dependent routine to create a type FT_INTEGER, using
509 defaults reasonable for the current target machine, and install
510 that type in ftypes for future reference.
514 Pointer to a fundamental type.
519 dwarf_fundamental_type (objfile
, typeid)
520 struct objfile
*objfile
;
523 if (typeid < 0 || typeid >= FT_NUM_MEMBERS
)
525 error ("internal error - invalid fundamental type id %d", typeid);
528 /* Look for this particular type in the fundamental type vector. If one is
529 not found, create and install one appropriate for the current language
530 and the current target machine. */
532 if (ftypes
[typeid] == NULL
)
534 ftypes
[typeid] = cu_language_defn
-> la_fund_type(objfile
, typeid);
537 return (ftypes
[typeid]);
544 set_cu_language -- set local copy of language for compilation unit
549 set_cu_language (struct dieinfo *dip)
553 Decode the language attribute for a compilation unit DIE and
554 remember what the language was. We use this at various times
555 when processing DIE's for a given compilation unit.
564 set_cu_language (dip
)
567 switch (dip
-> at_language
)
571 cu_language
= language_c
;
573 case LANG_C_PLUS_PLUS
:
574 cu_language
= language_cplus
;
576 /* start-sanitize-chill */
578 cu_language
= language_chill
;
580 /* end-sanitize-chill */
582 cu_language
= language_m2
;
591 cu_language
= language_unknown
;
594 cu_language_defn
= language_def (cu_language
);
601 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
605 void dwarf_build_psymtabs (struct objfile *objfile,
606 struct section_offsets *section_offsets,
607 int mainline, file_ptr dbfoff, unsigned int dbfsize,
608 file_ptr lnoffset, unsigned int lnsize)
612 This function is called upon to build partial symtabs from files
613 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
615 It is passed a bfd* containing the DIES
616 and line number information, the corresponding filename for that
617 file, a base address for relocating the symbols, a flag indicating
618 whether or not this debugging information is from a "main symbol
619 table" rather than a shared library or dynamically linked file,
620 and file offset/size pairs for the DIE information and line number
630 dwarf_build_psymtabs (objfile
, section_offsets
, mainline
, dbfoff
, dbfsize
,
632 struct objfile
*objfile
;
633 struct section_offsets
*section_offsets
;
636 unsigned int dbfsize
;
640 bfd
*abfd
= objfile
->obfd
;
641 struct cleanup
*back_to
;
643 current_objfile
= objfile
;
645 dbbase
= xmalloc (dbsize
);
647 if ((bfd_seek (abfd
, dbfoff
, L_SET
) != 0) ||
648 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
651 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
653 back_to
= make_cleanup (free
, dbbase
);
655 /* If we are reinitializing, or if we have never loaded syms yet, init.
656 Since we have no idea how many DIES we are looking at, we just guess
657 some arbitrary value. */
659 if (mainline
|| objfile
-> global_psymbols
.size
== 0 ||
660 objfile
-> static_psymbols
.size
== 0)
662 init_psymbol_list (objfile
, 1024);
665 /* Save the relocation factor where everybody can see it. */
667 base_section_offsets
= section_offsets
;
668 baseaddr
= ANOFFSET (section_offsets
, 0);
670 /* Follow the compilation unit sibling chain, building a partial symbol
671 table entry for each one. Save enough information about each compilation
672 unit to locate the full DWARF information later. */
674 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
676 do_cleanups (back_to
);
677 current_objfile
= NULL
;
685 record_minimal_symbol -- add entry to gdb's minimal symbol table
689 static void record_minimal_symbol (char *name, CORE_ADDR address,
690 enum minimal_symbol_type ms_type,
691 struct objfile *objfile)
695 Given a pointer to the name of a symbol that should be added to the
696 minimal symbol table, and the address associated with that
697 symbol, records this information for later use in building the
698 minimal symbol table.
703 record_minimal_symbol (name
, address
, ms_type
, objfile
)
706 enum minimal_symbol_type ms_type
;
707 struct objfile
*objfile
;
709 name
= obsavestring (name
, strlen (name
), &objfile
-> symbol_obstack
);
710 prim_record_minimal_symbol (name
, address
, ms_type
);
717 dwarfwarn -- issue a DWARF related warning
721 Issue warnings about DWARF related things that aren't serious enough
722 to warrant aborting with an error, but should not be ignored either.
723 This includes things like detectable corruption in DIE's, missing
724 DIE's, unimplemented features, etc.
726 In general, running across tags or attributes that we don't recognize
727 is not considered to be a problem and we should not issue warnings
732 We mostly follow the example of the error() routine, but without
733 returning to command level. It is arguable about whether warnings
734 should be issued at all, and if so, where they should go (stdout or
737 We assume that curdie is valid and contains at least the basic
738 information for the DIE where the problem was noticed.
749 fmt
= va_arg (ap
, char *);
751 fprintf (stderr
, "warning: DWARF ref 0x%x: ", curdie
-> die_ref
);
752 if (curdie
-> at_name
)
754 fprintf (stderr
, "'%s': ", curdie
-> at_name
);
756 vfprintf (stderr
, fmt
, ap
);
757 fprintf (stderr
, "\n");
766 read_lexical_block_scope -- process all dies in a lexical block
770 static void read_lexical_block_scope (struct dieinfo *dip,
771 char *thisdie, char *enddie)
775 Process all the DIES contained within a lexical block scope.
776 Start a new scope, process the dies, and then close the scope.
781 read_lexical_block_scope (dip
, thisdie
, enddie
, objfile
)
785 struct objfile
*objfile
;
787 register struct context_stack
*new;
789 push_context (0, dip
-> at_low_pc
);
790 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
791 new = pop_context ();
792 if (local_symbols
!= NULL
)
794 finish_block (0, &local_symbols
, new -> old_blocks
, new -> start_addr
,
795 dip
-> at_high_pc
, objfile
);
797 local_symbols
= new -> locals
;
804 lookup_utype -- look up a user defined type from die reference
808 static type *lookup_utype (DIE_REF die_ref)
812 Given a DIE reference, lookup the user defined type associated with
813 that DIE, if it has been registered already. If not registered, then
814 return NULL. Alloc_utype() can be called to register an empty
815 type for this reference, which will be filled in later when the
816 actual referenced DIE is processed.
820 lookup_utype (die_ref
)
823 struct type
*type
= NULL
;
826 utypeidx
= (die_ref
- dbroff
) / 4;
827 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
829 dwarfwarn ("reference to DIE (0x%x) outside compilation unit", die_ref
);
833 type
= *(utypes
+ utypeidx
);
843 alloc_utype -- add a user defined type for die reference
847 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
851 Given a die reference DIE_REF, and a possible pointer to a user
852 defined type UTYPEP, register that this reference has a user
853 defined type and either use the specified type in UTYPEP or
854 make a new empty type that will be filled in later.
856 We should only be called after calling lookup_utype() to verify that
857 there is not currently a type registered for DIE_REF.
861 alloc_utype (die_ref
, utypep
)
868 utypeidx
= (die_ref
- dbroff
) / 4;
869 typep
= utypes
+ utypeidx
;
870 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
872 utypep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
873 dwarfwarn ("reference to DIE (0x%x) outside compilation unit", die_ref
);
875 else if (*typep
!= NULL
)
878 SQUAWK (("internal error: dup user type allocation"));
884 utypep
= alloc_type (current_objfile
);
895 decode_die_type -- return a type for a specified die
899 static struct type *decode_die_type (struct dieinfo *dip)
903 Given a pointer to a die information structure DIP, decode the
904 type of the die and return a pointer to the decoded type. All
905 dies without specific types default to type int.
909 decode_die_type (dip
)
912 struct type
*type
= NULL
;
914 if (dip
-> at_fund_type
!= 0)
916 type
= decode_fund_type (dip
-> at_fund_type
);
918 else if (dip
-> at_mod_fund_type
!= NULL
)
920 type
= decode_mod_fund_type (dip
-> at_mod_fund_type
);
922 else if (dip
-> at_user_def_type
)
924 if ((type
= lookup_utype (dip
-> at_user_def_type
)) == NULL
)
926 type
= alloc_utype (dip
-> at_user_def_type
, NULL
);
929 else if (dip
-> at_mod_u_d_type
)
931 type
= decode_mod_u_d_type (dip
-> at_mod_u_d_type
);
935 type
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
944 struct_type -- compute and return the type for a struct or union
948 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
949 char *enddie, struct objfile *objfile)
953 Given pointer to a die information structure for a die which
954 defines a union or structure (and MUST define one or the other),
955 and pointers to the raw die data that define the range of dies which
956 define the members, compute and return the user defined type for the
961 struct_type (dip
, thisdie
, enddie
, objfile
)
965 struct objfile
*objfile
;
969 struct nextfield
*next
;
972 struct nextfield
*list
= NULL
;
973 struct nextfield
*new;
981 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
983 /* No forward references created an empty type, so install one now */
984 type
= alloc_utype (dip
-> die_ref
, NULL
);
986 INIT_CPLUS_SPECIFIC(type
);
987 switch (dip
-> die_tag
)
990 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
993 case TAG_structure_type
:
994 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
998 TYPE_CODE (type
) = TYPE_CODE_UNION
;
1002 /* Should never happen */
1003 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
1005 SQUAWK (("missing class, structure, or union tag"));
1008 /* Some compilers try to be helpful by inventing "fake" names for
1009 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1010 Thanks, but no thanks... */
1011 if (dip
-> at_name
!= NULL
1012 && *dip
-> at_name
!= '~'
1013 && *dip
-> at_name
!= '.')
1015 TYPE_NAME (type
) = obconcat (&objfile
-> type_obstack
,
1016 tpart1
, " ", dip
-> at_name
);
1018 /* Use whatever size is known. Zero is a valid size. We might however
1019 wish to check has_at_byte_size to make sure that some byte size was
1020 given explicitly, but DWARF doesn't specify that explicit sizes of
1021 zero have to present, so complaining about missing sizes should
1022 probably not be the default. */
1023 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1024 thisdie
+= dip
-> die_length
;
1025 while (thisdie
< enddie
)
1027 basicdieinfo (&mbr
, thisdie
, objfile
);
1028 completedieinfo (&mbr
, objfile
);
1029 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
1033 else if (mbr
.at_sibling
!= 0)
1035 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
1039 nextdie
= thisdie
+ mbr
.die_length
;
1041 switch (mbr
.die_tag
)
1044 /* Get space to record the next field's data. */
1045 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1048 /* Save the data. */
1049 list
-> field
.name
=
1050 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
1051 &objfile
-> type_obstack
);
1052 list
-> field
.type
= decode_die_type (&mbr
);
1053 list
-> field
.bitpos
= 8 * locval (mbr
.at_location
);
1054 /* Handle bit fields. */
1055 list
-> field
.bitsize
= mbr
.at_bit_size
;
1057 /* For big endian bits, the at_bit_offset gives the additional
1058 bit offset from the MSB of the containing anonymous object to
1059 the MSB of the field. We don't have to do anything special
1060 since we don't need to know the size of the anonymous object. */
1061 list
-> field
.bitpos
+= mbr
.at_bit_offset
;
1063 /* For little endian bits, we need to have a non-zero at_bit_size,
1064 so that we know we are in fact dealing with a bitfield. Compute
1065 the bit offset to the MSB of the anonymous object, subtract off
1066 the number of bits from the MSB of the field to the MSB of the
1067 object, and then subtract off the number of bits of the field
1068 itself. The result is the bit offset of the LSB of the field. */
1069 if (mbr
.at_bit_size
> 0)
1071 if (mbr
.has_at_byte_size
)
1073 /* The size of the anonymous object containing the bit field
1074 is explicit, so use the indicated size (in bytes). */
1075 anonymous_size
= mbr
.at_byte_size
;
1079 /* The size of the anonymous object containing the bit field
1080 matches the size of an object of the bit field's type.
1081 DWARF allows at_byte_size to be left out in such cases,
1082 as a debug information size optimization. */
1083 anonymous_size
= TYPE_LENGTH (list
-> field
.type
);
1085 list
-> field
.bitpos
+=
1086 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
1092 process_dies (thisdie
, nextdie
, objfile
);
1097 /* Now create the vector of fields, and record how big it is. We may
1098 not even have any fields, if this DIE was generated due to a reference
1099 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1100 set, which clues gdb in to the fact that it needs to search elsewhere
1101 for the full structure definition. */
1104 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1108 TYPE_NFIELDS (type
) = nfields
;
1109 TYPE_FIELDS (type
) = (struct field
*)
1110 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1111 /* Copy the saved-up fields into the field vector. */
1112 for (n
= nfields
; list
; list
= list
-> next
)
1114 TYPE_FIELD (type
, --n
) = list
-> field
;
1124 read_structure_scope -- process all dies within struct or union
1128 static void read_structure_scope (struct dieinfo *dip,
1129 char *thisdie, char *enddie, struct objfile *objfile)
1133 Called when we find the DIE that starts a structure or union
1134 scope (definition) to process all dies that define the members
1135 of the structure or union. DIP is a pointer to the die info
1136 struct for the DIE that names the structure or union.
1140 Note that we need to call struct_type regardless of whether or not
1141 the DIE has an at_name attribute, since it might be an anonymous
1142 structure or union. This gets the type entered into our set of
1145 However, if the structure is incomplete (an opaque struct/union)
1146 then suppress creating a symbol table entry for it since gdb only
1147 wants to find the one with the complete definition. Note that if
1148 it is complete, we just call new_symbol, which does it's own
1149 checking about whether the struct/union is anonymous or not (and
1150 suppresses creating a symbol table entry itself).
1155 read_structure_scope (dip
, thisdie
, enddie
, objfile
)
1156 struct dieinfo
*dip
;
1159 struct objfile
*objfile
;
1164 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1165 if (!(TYPE_FLAGS (type
) & TYPE_FLAG_STUB
))
1167 sym
= new_symbol (dip
, objfile
);
1170 SYMBOL_TYPE (sym
) = type
;
1171 if (cu_language
== language_cplus
)
1173 synthesize_typedef (dip
, objfile
, type
);
1183 decode_array_element_type -- decode type of the array elements
1187 static struct type *decode_array_element_type (char *scan, char *end)
1191 As the last step in decoding the array subscript information for an
1192 array DIE, we need to decode the type of the array elements. We are
1193 passed a pointer to this last part of the subscript information and
1194 must return the appropriate type. If the type attribute is not
1195 recognized, just warn about the problem and return type int.
1198 static struct type
*
1199 decode_array_element_type (scan
)
1204 unsigned short attribute
;
1205 unsigned short fundtype
;
1208 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1210 scan
+= SIZEOF_ATTRIBUTE
;
1211 if ((nbytes
= attribute_size (attribute
)) == -1)
1213 SQUAWK (("bad array element type attribute 0x%x", attribute
));
1214 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1221 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1223 typep
= decode_fund_type (fundtype
);
1225 case AT_mod_fund_type
:
1226 typep
= decode_mod_fund_type (scan
);
1228 case AT_user_def_type
:
1229 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1231 if ((typep
= lookup_utype (die_ref
)) == NULL
)
1233 typep
= alloc_utype (die_ref
, NULL
);
1236 case AT_mod_u_d_type
:
1237 typep
= decode_mod_u_d_type (scan
);
1240 SQUAWK (("bad array element type attribute 0x%x", attribute
));
1241 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1252 decode_subscr_data -- decode array subscript and element type data
1256 static struct type *decode_subscr_data (char *scan, char *end)
1260 The array subscripts and the data type of the elements of an
1261 array are described by a list of data items, stored as a block
1262 of contiguous bytes. There is a data item describing each array
1263 dimension, and a final data item describing the element type.
1264 The data items are ordered the same as their appearance in the
1265 source (I.E. leftmost dimension first, next to leftmost second,
1268 We are passed a pointer to the start of the block of bytes
1269 containing the data items, and a pointer to the first byte past
1270 the data. This function decodes the data and returns a type.
1273 FIXME: This code only implements the forms currently used
1274 by the AT&T and GNU C compilers.
1276 The end pointer is supplied for error checking, maybe we should
1280 static struct type
*
1281 decode_subscr_data (scan
, end
)
1285 struct type
*typep
= NULL
;
1286 struct type
*nexttype
;
1287 unsigned int format
;
1288 unsigned short fundtype
;
1289 unsigned long lowbound
;
1290 unsigned long highbound
;
1293 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1295 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1299 typep
= decode_array_element_type (scan
);
1302 /* Read the type of the index, but don't do anything with it.
1303 FIXME: This is OK for C since only int's are allowed.
1304 It might not be OK for other languages. */
1305 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1307 scan
+= SIZEOF_FMT_FT
;
1308 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1309 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1311 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, current_objfile
);
1313 nexttype
= decode_subscr_data (scan
, end
);
1314 if (nexttype
!= NULL
)
1316 typep
= alloc_type (current_objfile
);
1317 TYPE_CODE (typep
) = TYPE_CODE_ARRAY
;
1318 TYPE_LENGTH (typep
) = TYPE_LENGTH (nexttype
);
1319 TYPE_LENGTH (typep
) *= (highbound
- lowbound
) + 1;
1320 TYPE_TARGET_TYPE (typep
) = nexttype
;
1330 SQUAWK (("array subscript format 0x%x not handled yet", format
));
1333 SQUAWK (("unknown array subscript format %x", format
));
1343 dwarf_read_array_type -- read TAG_array_type DIE
1347 static void dwarf_read_array_type (struct dieinfo *dip)
1351 Extract all information from a TAG_array_type DIE and add to
1352 the user defined type vector.
1356 dwarf_read_array_type (dip
)
1357 struct dieinfo
*dip
;
1363 unsigned short blocksz
;
1366 if (dip
-> at_ordering
!= ORD_row_major
)
1368 /* FIXME: Can gdb even handle column major arrays? */
1369 SQUAWK (("array not row major; not handled correctly"));
1371 if ((sub
= dip
-> at_subscr_data
) != NULL
)
1373 nbytes
= attribute_size (AT_subscr_data
);
1374 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1375 subend
= sub
+ nbytes
+ blocksz
;
1377 type
= decode_subscr_data (sub
, subend
);
1380 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1382 utype
= alloc_utype (dip
-> die_ref
, NULL
);
1384 TYPE_CODE (utype
) = TYPE_CODE_ARRAY
;
1385 TYPE_TARGET_TYPE (utype
) =
1386 dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1387 TYPE_LENGTH (utype
) = 1 * TYPE_LENGTH (TYPE_TARGET_TYPE (utype
));
1391 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1393 alloc_utype (dip
-> die_ref
, type
);
1397 TYPE_CODE (utype
) = TYPE_CODE_ARRAY
;
1398 TYPE_LENGTH (utype
) = TYPE_LENGTH (type
);
1399 TYPE_TARGET_TYPE (utype
) = TYPE_TARGET_TYPE (type
);
1409 read_tag_pointer_type -- read TAG_pointer_type DIE
1413 static void read_tag_pointer_type (struct dieinfo *dip)
1417 Extract all information from a TAG_pointer_type DIE and add to
1418 the user defined type vector.
1422 read_tag_pointer_type (dip
)
1423 struct dieinfo
*dip
;
1428 type
= decode_die_type (dip
);
1429 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1431 utype
= lookup_pointer_type (type
);
1432 alloc_utype (dip
-> die_ref
, utype
);
1436 TYPE_TARGET_TYPE (utype
) = type
;
1437 TYPE_POINTER_TYPE (type
) = utype
;
1439 /* We assume the machine has only one representation for pointers! */
1440 /* FIXME: This confuses host<->target data representations, and is a
1441 poor assumption besides. */
1443 TYPE_LENGTH (utype
) = sizeof (char *);
1444 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1452 read_subroutine_type -- process TAG_subroutine_type dies
1456 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1461 Handle DIES due to C code like:
1464 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1470 The parameter DIES are currently ignored. See if gdb has a way to
1471 include this info in it's type system, and decode them if so. Is
1472 this what the type structure's "arg_types" field is for? (FIXME)
1476 read_subroutine_type (dip
, thisdie
, enddie
)
1477 struct dieinfo
*dip
;
1481 struct type
*type
; /* Type that this function returns */
1482 struct type
*ftype
; /* Function that returns above type */
1484 /* Decode the type that this subroutine returns */
1486 type
= decode_die_type (dip
);
1488 /* Check to see if we already have a partially constructed user
1489 defined type for this DIE, from a forward reference. */
1491 if ((ftype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1493 /* This is the first reference to one of these types. Make
1494 a new one and place it in the user defined types. */
1495 ftype
= lookup_function_type (type
);
1496 alloc_utype (dip
-> die_ref
, ftype
);
1500 /* We have an existing partially constructed type, so bash it
1501 into the correct type. */
1502 TYPE_TARGET_TYPE (ftype
) = type
;
1503 TYPE_FUNCTION_TYPE (type
) = ftype
;
1504 TYPE_LENGTH (ftype
) = 1;
1505 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1513 read_enumeration -- process dies which define an enumeration
1517 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1518 char *enddie, struct objfile *objfile)
1522 Given a pointer to a die which begins an enumeration, process all
1523 the dies that define the members of the enumeration.
1527 Note that we need to call enum_type regardless of whether or not we
1528 have a symbol, since we might have an enum without a tag name (thus
1529 no symbol for the tagname).
1533 read_enumeration (dip
, thisdie
, enddie
, objfile
)
1534 struct dieinfo
*dip
;
1537 struct objfile
*objfile
;
1542 type
= enum_type (dip
, objfile
);
1543 sym
= new_symbol (dip
, objfile
);
1546 SYMBOL_TYPE (sym
) = type
;
1547 if (cu_language
== language_cplus
)
1549 synthesize_typedef (dip
, objfile
, type
);
1558 enum_type -- decode and return a type for an enumeration
1562 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1566 Given a pointer to a die information structure for the die which
1567 starts an enumeration, process all the dies that define the members
1568 of the enumeration and return a type pointer for the enumeration.
1570 At the same time, for each member of the enumeration, create a
1571 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1572 and give it the type of the enumeration itself.
1576 Note that the DWARF specification explicitly mandates that enum
1577 constants occur in reverse order from the source program order,
1578 for "consistency" and because this ordering is easier for many
1579 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1580 Entries). Because gdb wants to see the enum members in program
1581 source order, we have to ensure that the order gets reversed while
1582 we are processing them.
1585 static struct type
*
1586 enum_type (dip
, objfile
)
1587 struct dieinfo
*dip
;
1588 struct objfile
*objfile
;
1592 struct nextfield
*next
;
1595 struct nextfield
*list
= NULL
;
1596 struct nextfield
*new;
1601 unsigned short blocksz
;
1605 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1607 /* No forward references created an empty type, so install one now */
1608 type
= alloc_utype (dip
-> die_ref
, NULL
);
1610 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1611 /* Some compilers try to be helpful by inventing "fake" names for
1612 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1613 Thanks, but no thanks... */
1614 if (dip
-> at_name
!= NULL
1615 && *dip
-> at_name
!= '~'
1616 && *dip
-> at_name
!= '.')
1618 TYPE_NAME (type
) = obconcat (&objfile
-> type_obstack
, "enum",
1619 " ", dip
-> at_name
);
1621 if (dip
-> at_byte_size
!= 0)
1623 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1625 if ((scan
= dip
-> at_element_list
) != NULL
)
1627 if (dip
-> short_element_list
)
1629 nbytes
= attribute_size (AT_short_element_list
);
1633 nbytes
= attribute_size (AT_element_list
);
1635 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1636 listend
= scan
+ nbytes
+ blocksz
;
1638 while (scan
< listend
)
1640 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1643 list
-> field
.type
= NULL
;
1644 list
-> field
.bitsize
= 0;
1645 list
-> field
.bitpos
=
1646 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1648 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1649 list
-> field
.name
= obsavestring (scan
, strlen (scan
),
1650 &objfile
-> type_obstack
);
1651 scan
+= strlen (scan
) + 1;
1653 /* Handcraft a new symbol for this enum member. */
1654 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1655 sizeof (struct symbol
));
1656 memset (sym
, 0, sizeof (struct symbol
));
1657 SYMBOL_NAME (sym
) = create_name (list
-> field
.name
,
1658 &objfile
->symbol_obstack
);
1659 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1660 SYMBOL_CLASS (sym
) = LOC_CONST
;
1661 SYMBOL_TYPE (sym
) = type
;
1662 SYMBOL_VALUE (sym
) = list
-> field
.bitpos
;
1663 add_symbol_to_list (sym
, list_in_scope
);
1665 /* Now create the vector of fields, and record how big it is. This is
1666 where we reverse the order, by pulling the members off the list in
1667 reverse order from how they were inserted. If we have no fields
1668 (this is apparently possible in C++) then skip building a field
1672 TYPE_NFIELDS (type
) = nfields
;
1673 TYPE_FIELDS (type
) = (struct field
*)
1674 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1675 /* Copy the saved-up fields into the field vector. */
1676 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
-> next
)
1678 TYPE_FIELD (type
, n
++) = list
-> field
;
1689 read_func_scope -- process all dies within a function scope
1693 Process all dies within a given function scope. We are passed
1694 a die information structure pointer DIP for the die which
1695 starts the function scope, and pointers into the raw die data
1696 that define the dies within the function scope.
1698 For now, we ignore lexical block scopes within the function.
1699 The problem is that AT&T cc does not define a DWARF lexical
1700 block scope for the function itself, while gcc defines a
1701 lexical block scope for the function. We need to think about
1702 how to handle this difference, or if it is even a problem.
1707 read_func_scope (dip
, thisdie
, enddie
, objfile
)
1708 struct dieinfo
*dip
;
1711 struct objfile
*objfile
;
1713 register struct context_stack
*new;
1715 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1716 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1718 objfile
-> ei
.entry_func_lowpc
= dip
-> at_low_pc
;
1719 objfile
-> ei
.entry_func_highpc
= dip
-> at_high_pc
;
1721 if (STREQ (dip
-> at_name
, "main")) /* FIXME: hardwired name */
1723 objfile
-> ei
.main_func_lowpc
= dip
-> at_low_pc
;
1724 objfile
-> ei
.main_func_highpc
= dip
-> at_high_pc
;
1726 new = push_context (0, dip
-> at_low_pc
);
1727 new -> name
= new_symbol (dip
, objfile
);
1728 list_in_scope
= &local_symbols
;
1729 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1730 new = pop_context ();
1731 /* Make a block for the local symbols within. */
1732 finish_block (new -> name
, &local_symbols
, new -> old_blocks
,
1733 new -> start_addr
, dip
-> at_high_pc
, objfile
);
1734 list_in_scope
= &file_symbols
;
1742 handle_producer -- process the AT_producer attribute
1746 Perform any operations that depend on finding a particular
1747 AT_producer attribute.
1752 handle_producer (producer
)
1756 /* If this compilation unit was compiled with g++ or gcc, then set the
1757 processing_gcc_compilation flag. */
1759 processing_gcc_compilation
=
1760 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
))
1761 /* start-sanitize-chill */
1762 || STREQN (producer
, CHILL_PRODUCER
, strlen (CHILL_PRODUCER
))
1763 /* end-sanitize-chill */
1764 || STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
));
1766 /* Select a demangling style if we can identify the producer and if
1767 the current style is auto. We leave the current style alone if it
1768 is not auto. We also leave the demangling style alone if we find a
1769 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1771 #if 1 /* Works, but is experimental. -fnf */
1772 if (AUTO_DEMANGLING
)
1774 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1776 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1778 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1780 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1782 else if (STREQN (producer
, CFRONT_PRODUCER
, strlen (CFRONT_PRODUCER
)))
1784 set_demangling_style (CFRONT_DEMANGLING_STYLE_STRING
);
1795 read_file_scope -- process all dies within a file scope
1799 Process all dies within a given file scope. We are passed a
1800 pointer to the die information structure for the die which
1801 starts the file scope, and pointers into the raw die data which
1802 mark the range of dies within the file scope.
1804 When the partial symbol table is built, the file offset for the line
1805 number table for each compilation unit is saved in the partial symbol
1806 table entry for that compilation unit. As the symbols for each
1807 compilation unit are read, the line number table is read into memory
1808 and the variable lnbase is set to point to it. Thus all we have to
1809 do is use lnbase to access the line number table for the current
1814 read_file_scope (dip
, thisdie
, enddie
, objfile
)
1815 struct dieinfo
*dip
;
1818 struct objfile
*objfile
;
1820 struct cleanup
*back_to
;
1821 struct symtab
*symtab
;
1823 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1824 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1826 objfile
-> ei
.entry_file_lowpc
= dip
-> at_low_pc
;
1827 objfile
-> ei
.entry_file_highpc
= dip
-> at_high_pc
;
1829 set_cu_language (dip
);
1830 if (dip
-> at_producer
!= NULL
)
1832 handle_producer (dip
-> at_producer
);
1834 numutypes
= (enddie
- thisdie
) / 4;
1835 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1836 back_to
= make_cleanup (free
, utypes
);
1837 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1838 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1839 start_symtab (dip
-> at_name
, dip
-> at_comp_dir
, dip
-> at_low_pc
);
1840 decode_line_numbers (lnbase
);
1841 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1842 symtab
= end_symtab (dip
-> at_high_pc
, 0, 0, objfile
);
1845 symtab
-> language
= cu_language
;
1847 do_cleanups (back_to
);
1856 process_dies -- process a range of DWARF Information Entries
1860 static void process_dies (char *thisdie, char *enddie,
1861 struct objfile *objfile)
1865 Process all DIE's in a specified range. May be (and almost
1866 certainly will be) called recursively.
1870 process_dies (thisdie
, enddie
, objfile
)
1873 struct objfile
*objfile
;
1878 while (thisdie
< enddie
)
1880 basicdieinfo (&di
, thisdie
, objfile
);
1881 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1885 else if (di
.die_tag
== TAG_padding
)
1887 nextdie
= thisdie
+ di
.die_length
;
1891 completedieinfo (&di
, objfile
);
1892 if (di
.at_sibling
!= 0)
1894 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1898 nextdie
= thisdie
+ di
.die_length
;
1902 case TAG_compile_unit
:
1903 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
1905 case TAG_global_subroutine
:
1906 case TAG_subroutine
:
1907 if (di
.has_at_low_pc
)
1909 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
1912 case TAG_lexical_block
:
1913 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
1915 case TAG_class_type
:
1916 case TAG_structure_type
:
1917 case TAG_union_type
:
1918 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
1920 case TAG_enumeration_type
:
1921 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
1923 case TAG_subroutine_type
:
1924 read_subroutine_type (&di
, thisdie
, nextdie
);
1926 case TAG_array_type
:
1927 dwarf_read_array_type (&di
);
1929 case TAG_pointer_type
:
1930 read_tag_pointer_type (&di
);
1933 new_symbol (&di
, objfile
);
1945 decode_line_numbers -- decode a line number table fragment
1949 static void decode_line_numbers (char *tblscan, char *tblend,
1950 long length, long base, long line, long pc)
1954 Translate the DWARF line number information to gdb form.
1956 The ".line" section contains one or more line number tables, one for
1957 each ".line" section from the objects that were linked.
1959 The AT_stmt_list attribute for each TAG_source_file entry in the
1960 ".debug" section contains the offset into the ".line" section for the
1961 start of the table for that file.
1963 The table itself has the following structure:
1965 <table length><base address><source statement entry>
1966 4 bytes 4 bytes 10 bytes
1968 The table length is the total size of the table, including the 4 bytes
1969 for the length information.
1971 The base address is the address of the first instruction generated
1972 for the source file.
1974 Each source statement entry has the following structure:
1976 <line number><statement position><address delta>
1977 4 bytes 2 bytes 4 bytes
1979 The line number is relative to the start of the file, starting with
1982 The statement position either -1 (0xFFFF) or the number of characters
1983 from the beginning of the line to the beginning of the statement.
1985 The address delta is the difference between the base address and
1986 the address of the first instruction for the statement.
1988 Note that we must copy the bytes from the packed table to our local
1989 variables before attempting to use them, to avoid alignment problems
1990 on some machines, particularly RISC processors.
1994 Does gdb expect the line numbers to be sorted? They are now by
1995 chance/luck, but are not required to be. (FIXME)
1997 The line with number 0 is unused, gdb apparently can discover the
1998 span of the last line some other way. How? (FIXME)
2002 decode_line_numbers (linetable
)
2007 unsigned long length
;
2012 if (linetable
!= NULL
)
2014 tblscan
= tblend
= linetable
;
2015 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2017 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2019 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2020 GET_UNSIGNED
, current_objfile
);
2021 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2023 while (tblscan
< tblend
)
2025 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2027 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2028 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2030 tblscan
+= SIZEOF_LINETBL_DELTA
;
2034 record_line (current_subfile
, line
, pc
);
2044 locval -- compute the value of a location attribute
2048 static int locval (char *loc)
2052 Given pointer to a string of bytes that define a location, compute
2053 the location and return the value.
2055 When computing values involving the current value of the frame pointer,
2056 the value zero is used, which results in a value relative to the frame
2057 pointer, rather than the absolute value. This is what GDB wants
2060 When the result is a register number, the global isreg flag is set,
2061 otherwise it is cleared. This is a kludge until we figure out a better
2062 way to handle the problem. Gdb's design does not mesh well with the
2063 DWARF notion of a location computing interpreter, which is a shame
2064 because the flexibility goes unused.
2068 Note that stack[0] is unused except as a default error return.
2069 Note that stack overflow is not yet handled.
2076 unsigned short nbytes
;
2077 unsigned short locsize
;
2078 auto long stack
[64];
2085 nbytes
= attribute_size (AT_location
);
2086 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2088 end
= loc
+ locsize
;
2093 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2096 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2098 loc
+= SIZEOF_LOC_ATOM_CODE
;
2099 switch (loc_atom_code
)
2106 /* push register (number) */
2107 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2108 GET_UNSIGNED
, current_objfile
);
2109 loc
+= loc_value_size
;
2113 /* push value of register (number) */
2114 /* Actually, we compute the value as if register has 0 */
2116 regno
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2118 loc
+= loc_value_size
;
2121 stack
[++stacki
] = 0;
2125 stack
[++stacki
] = 0;
2126 SQUAWK (("BASEREG %d not handled!", regno
));
2130 /* push address (relocated address) */
2131 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2132 GET_UNSIGNED
, current_objfile
);
2133 loc
+= loc_value_size
;
2136 /* push constant (number) FIXME: signed or unsigned! */
2137 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2138 GET_SIGNED
, current_objfile
);
2139 loc
+= loc_value_size
;
2142 /* pop, deref and push 2 bytes (as a long) */
2143 SQUAWK (("OP_DEREF2 address 0x%x not handled", stack
[stacki
]));
2145 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2146 SQUAWK (("OP_DEREF4 address 0x%x not handled", stack
[stacki
]));
2148 case OP_ADD
: /* pop top 2 items, add, push result */
2149 stack
[stacki
- 1] += stack
[stacki
];
2154 return (stack
[stacki
]);
2161 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2165 static struct symtab *read_ofile_symtab (struct partial_symtab *pst)
2169 When expanding a partial symbol table entry to a full symbol table
2170 entry, this is the function that gets called to read in the symbols
2171 for the compilation unit.
2173 Returns a pointer to the newly constructed symtab (which is now
2174 the new first one on the objfile's symtab list).
2177 static struct symtab
*
2178 read_ofile_symtab (pst
)
2179 struct partial_symtab
*pst
;
2181 struct cleanup
*back_to
;
2182 unsigned long lnsize
;
2185 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2187 abfd
= pst
-> objfile
-> obfd
;
2188 current_objfile
= pst
-> objfile
;
2190 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2191 unit, seek to the location in the file, and read in all the DIE's. */
2194 dbsize
= DBLENGTH (pst
);
2195 dbbase
= xmalloc (dbsize
);
2196 dbroff
= DBROFF(pst
);
2197 foffset
= DBFOFF(pst
) + dbroff
;
2198 base_section_offsets
= pst
->section_offsets
;
2199 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2200 if (bfd_seek (abfd
, foffset
, L_SET
) ||
2201 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
2204 error ("can't read DWARF data");
2206 back_to
= make_cleanup (free
, dbbase
);
2208 /* If there is a line number table associated with this compilation unit
2209 then read the size of this fragment in bytes, from the fragment itself.
2210 Allocate a buffer for the fragment and read it in for future
2216 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2217 (bfd_read ((PTR
) lnsizedata
, sizeof (lnsizedata
), 1, abfd
) !=
2218 sizeof (lnsizedata
)))
2220 error ("can't read DWARF line number table size");
2222 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2223 GET_UNSIGNED
, pst
-> objfile
);
2224 lnbase
= xmalloc (lnsize
);
2225 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2226 (bfd_read (lnbase
, lnsize
, 1, abfd
) != lnsize
))
2229 error ("can't read DWARF line numbers");
2231 make_cleanup (free
, lnbase
);
2234 process_dies (dbbase
, dbbase
+ dbsize
, pst
-> objfile
);
2235 do_cleanups (back_to
);
2236 current_objfile
= NULL
;
2237 return (pst
-> objfile
-> symtabs
);
2244 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2248 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2252 Called once for each partial symbol table entry that needs to be
2253 expanded into a full symbol table entry.
2258 psymtab_to_symtab_1 (pst
)
2259 struct partial_symtab
*pst
;
2262 struct cleanup
*old_chain
;
2268 warning ("psymtab for %s already read in. Shouldn't happen.",
2273 /* Read in all partial symtabs on which this one is dependent */
2274 for (i
= 0; i
< pst
-> number_of_dependencies
; i
++)
2276 if (!pst
-> dependencies
[i
] -> readin
)
2278 /* Inform about additional files that need to be read in. */
2281 fputs_filtered (" ", stdout
);
2283 fputs_filtered ("and ", stdout
);
2285 printf_filtered ("%s...",
2286 pst
-> dependencies
[i
] -> filename
);
2288 fflush (stdout
); /* Flush output */
2290 psymtab_to_symtab_1 (pst
-> dependencies
[i
]);
2293 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2296 old_chain
= make_cleanup (really_free_pendings
, 0);
2297 pst
-> symtab
= read_ofile_symtab (pst
);
2300 printf_filtered ("%d DIE's, sorting...", diecount
);
2304 sort_symtab_syms (pst
-> symtab
);
2305 do_cleanups (old_chain
);
2316 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2320 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2324 This is the DWARF support entry point for building a full symbol
2325 table entry from a partial symbol table entry. We are passed a
2326 pointer to the partial symbol table entry that needs to be expanded.
2331 dwarf_psymtab_to_symtab (pst
)
2332 struct partial_symtab
*pst
;
2339 warning ("psymtab for %s already read in. Shouldn't happen.",
2344 if (DBLENGTH (pst
) || pst
-> number_of_dependencies
)
2346 /* Print the message now, before starting serious work, to avoid
2347 disconcerting pauses. */
2350 printf_filtered ("Reading in symbols for %s...",
2355 psymtab_to_symtab_1 (pst
);
2357 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2358 we need to do an equivalent or is this something peculiar to
2360 Match with global symbols. This only needs to be done once,
2361 after all of the symtabs and dependencies have been read in.
2363 scan_file_globals (pst
-> objfile
);
2366 /* Finish up the verbose info message. */
2369 printf_filtered ("done.\n");
2381 init_psymbol_list -- initialize storage for partial symbols
2385 static void init_psymbol_list (struct objfile *objfile, int total_symbols)
2389 Initializes storage for all of the partial symbols that will be
2390 created by dwarf_build_psymtabs and subsidiaries.
2394 init_psymbol_list (objfile
, total_symbols
)
2395 struct objfile
*objfile
;
2398 /* Free any previously allocated psymbol lists. */
2400 if (objfile
-> global_psymbols
.list
)
2402 mfree (objfile
-> md
, (PTR
)objfile
-> global_psymbols
.list
);
2404 if (objfile
-> static_psymbols
.list
)
2406 mfree (objfile
-> md
, (PTR
)objfile
-> static_psymbols
.list
);
2409 /* Current best guess is that there are approximately a twentieth
2410 of the total symbols (in a debugging file) are global or static
2413 objfile
-> global_psymbols
.size
= total_symbols
/ 10;
2414 objfile
-> static_psymbols
.size
= total_symbols
/ 10;
2415 objfile
-> global_psymbols
.next
=
2416 objfile
-> global_psymbols
.list
= (struct partial_symbol
*)
2417 xmmalloc (objfile
-> md
, objfile
-> global_psymbols
.size
2418 * sizeof (struct partial_symbol
));
2419 objfile
-> static_psymbols
.next
=
2420 objfile
-> static_psymbols
.list
= (struct partial_symbol
*)
2421 xmmalloc (objfile
-> md
, objfile
-> static_psymbols
.size
2422 * sizeof (struct partial_symbol
));
2429 add_enum_psymbol -- add enumeration members to partial symbol table
2433 Given pointer to a DIE that is known to be for an enumeration,
2434 extract the symbolic names of the enumeration members and add
2435 partial symbols for them.
2439 add_enum_psymbol (dip
, objfile
)
2440 struct dieinfo
*dip
;
2441 struct objfile
*objfile
;
2445 unsigned short blocksz
;
2448 if ((scan
= dip
-> at_element_list
) != NULL
)
2450 if (dip
-> short_element_list
)
2452 nbytes
= attribute_size (AT_short_element_list
);
2456 nbytes
= attribute_size (AT_element_list
);
2458 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2460 listend
= scan
+ blocksz
;
2461 while (scan
< listend
)
2463 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2464 ADD_PSYMBOL_TO_LIST (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2465 objfile
-> static_psymbols
, 0);
2466 scan
+= strlen (scan
) + 1;
2475 add_partial_symbol -- add symbol to partial symbol table
2479 Given a DIE, if it is one of the types that we want to
2480 add to a partial symbol table, finish filling in the die info
2481 and then add a partial symbol table entry for it.
2485 The caller must ensure that the DIE has a valid name attribute.
2489 add_partial_symbol (dip
, objfile
)
2490 struct dieinfo
*dip
;
2491 struct objfile
*objfile
;
2493 switch (dip
-> die_tag
)
2495 case TAG_global_subroutine
:
2496 record_minimal_symbol (dip
-> at_name
, dip
-> at_low_pc
, mst_text
,
2498 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2499 VAR_NAMESPACE
, LOC_BLOCK
,
2500 objfile
-> global_psymbols
,
2503 case TAG_global_variable
:
2504 record_minimal_symbol (dip
-> at_name
, locval (dip
-> at_location
),
2506 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2507 VAR_NAMESPACE
, LOC_STATIC
,
2508 objfile
-> global_psymbols
,
2511 case TAG_subroutine
:
2512 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2513 VAR_NAMESPACE
, LOC_BLOCK
,
2514 objfile
-> static_psymbols
,
2517 case TAG_local_variable
:
2518 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2519 VAR_NAMESPACE
, LOC_STATIC
,
2520 objfile
-> static_psymbols
,
2524 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2525 VAR_NAMESPACE
, LOC_TYPEDEF
,
2526 objfile
-> static_psymbols
,
2529 case TAG_class_type
:
2530 case TAG_structure_type
:
2531 case TAG_union_type
:
2532 case TAG_enumeration_type
:
2533 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2534 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2535 objfile
-> static_psymbols
,
2537 if (cu_language
== language_cplus
)
2539 /* For C++, these implicitly act as typedefs as well. */
2540 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2541 VAR_NAMESPACE
, LOC_TYPEDEF
,
2542 objfile
-> static_psymbols
,
2553 scan_partial_symbols -- scan DIE's within a single compilation unit
2557 Process the DIE's within a single compilation unit, looking for
2558 interesting DIE's that contribute to the partial symbol table entry
2559 for this compilation unit.
2563 There are some DIE's that may appear both at file scope and within
2564 the scope of a function. We are only interested in the ones at file
2565 scope, and the only way to tell them apart is to keep track of the
2566 scope. For example, consider the test case:
2571 for which the relevant DWARF segment has the structure:
2574 0x23 global subrtn sibling 0x9b
2576 fund_type FT_integer
2581 0x23 local var sibling 0x97
2583 fund_type FT_integer
2584 location OP_BASEREG 0xe
2591 0x1d local var sibling 0xb8
2593 fund_type FT_integer
2594 location OP_ADDR 0x800025dc
2599 We want to include the symbol 'i' in the partial symbol table, but
2600 not the symbol 'j'. In essence, we want to skip all the dies within
2601 the scope of a TAG_global_subroutine DIE.
2603 Don't attempt to add anonymous structures or unions since they have
2604 no name. Anonymous enumerations however are processed, because we
2605 want to extract their member names (the check for a tag name is
2608 Also, for variables and subroutines, check that this is the place
2609 where the actual definition occurs, rather than just a reference
2614 scan_partial_symbols (thisdie
, enddie
, objfile
)
2617 struct objfile
*objfile
;
2623 while (thisdie
< enddie
)
2625 basicdieinfo (&di
, thisdie
, objfile
);
2626 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2632 nextdie
= thisdie
+ di
.die_length
;
2633 /* To avoid getting complete die information for every die, we
2634 only do it (below) for the cases we are interested in. */
2637 case TAG_global_subroutine
:
2638 case TAG_subroutine
:
2639 completedieinfo (&di
, objfile
);
2640 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2642 add_partial_symbol (&di
, objfile
);
2643 /* If there is a sibling attribute, adjust the nextdie
2644 pointer to skip the entire scope of the subroutine.
2645 Apply some sanity checking to make sure we don't
2646 overrun or underrun the range of remaining DIE's */
2647 if (di
.at_sibling
!= 0)
2649 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2650 if ((temp
< thisdie
) || (temp
>= enddie
))
2652 dwarfwarn ("reference to DIE (0x%x) outside compilation unit", di
.at_sibling
);
2661 case TAG_global_variable
:
2662 case TAG_local_variable
:
2663 completedieinfo (&di
, objfile
);
2664 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2666 add_partial_symbol (&di
, objfile
);
2670 case TAG_class_type
:
2671 case TAG_structure_type
:
2672 case TAG_union_type
:
2673 completedieinfo (&di
, objfile
);
2676 add_partial_symbol (&di
, objfile
);
2679 case TAG_enumeration_type
:
2680 completedieinfo (&di
, objfile
);
2683 add_partial_symbol (&di
, objfile
);
2685 add_enum_psymbol (&di
, objfile
);
2697 scan_compilation_units -- build a psymtab entry for each compilation
2701 This is the top level dwarf parsing routine for building partial
2704 It scans from the beginning of the DWARF table looking for the first
2705 TAG_compile_unit DIE, and then follows the sibling chain to locate
2706 each additional TAG_compile_unit DIE.
2708 For each TAG_compile_unit DIE it creates a partial symtab structure,
2709 calls a subordinate routine to collect all the compilation unit's
2710 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2711 new partial symtab structure into the partial symbol table. It also
2712 records the appropriate information in the partial symbol table entry
2713 to allow the chunk of DIE's and line number table for this compilation
2714 unit to be located and re-read later, to generate a complete symbol
2715 table entry for the compilation unit.
2717 Thus it effectively partitions up a chunk of DIE's for multiple
2718 compilation units into smaller DIE chunks and line number tables,
2719 and associates them with a partial symbol table entry.
2723 If any compilation unit has no line number table associated with
2724 it for some reason (a missing at_stmt_list attribute, rather than
2725 just one with a value of zero, which is valid) then we ensure that
2726 the recorded file offset is zero so that the routine which later
2727 reads line number table fragments knows that there is no fragment
2737 scan_compilation_units (thisdie
, enddie
, dbfoff
, lnoffset
, objfile
)
2742 struct objfile
*objfile
;
2746 struct partial_symtab
*pst
;
2749 file_ptr curlnoffset
;
2751 while (thisdie
< enddie
)
2753 basicdieinfo (&di
, thisdie
, objfile
);
2754 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2758 else if (di
.die_tag
!= TAG_compile_unit
)
2760 nextdie
= thisdie
+ di
.die_length
;
2764 completedieinfo (&di
, objfile
);
2765 set_cu_language (&di
);
2766 if (di
.at_sibling
!= 0)
2768 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2772 nextdie
= thisdie
+ di
.die_length
;
2774 curoff
= thisdie
- dbbase
;
2775 culength
= nextdie
- thisdie
;
2776 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2778 /* First allocate a new partial symbol table structure */
2780 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2781 di
.at_name
, di
.at_low_pc
,
2782 objfile
-> global_psymbols
.next
,
2783 objfile
-> static_psymbols
.next
);
2785 pst
-> texthigh
= di
.at_high_pc
;
2786 pst
-> read_symtab_private
= (char *)
2787 obstack_alloc (&objfile
-> psymbol_obstack
,
2788 sizeof (struct dwfinfo
));
2789 DBFOFF (pst
) = dbfoff
;
2790 DBROFF (pst
) = curoff
;
2791 DBLENGTH (pst
) = culength
;
2792 LNFOFF (pst
) = curlnoffset
;
2793 pst
-> read_symtab
= dwarf_psymtab_to_symtab
;
2795 /* Now look for partial symbols */
2797 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2799 pst
-> n_global_syms
= objfile
-> global_psymbols
.next
-
2800 (objfile
-> global_psymbols
.list
+ pst
-> globals_offset
);
2801 pst
-> n_static_syms
= objfile
-> static_psymbols
.next
-
2802 (objfile
-> static_psymbols
.list
+ pst
-> statics_offset
);
2803 sort_pst_symbols (pst
);
2804 /* If there is already a psymtab or symtab for a file of this name,
2805 remove it. (If there is a symtab, more drastic things also
2806 happen.) This happens in VxWorks. */
2807 free_named_symtabs (pst
-> filename
);
2817 new_symbol -- make a symbol table entry for a new symbol
2821 static struct symbol *new_symbol (struct dieinfo *dip,
2822 struct objfile *objfile)
2826 Given a pointer to a DWARF information entry, figure out if we need
2827 to make a symbol table entry for it, and if so, create a new entry
2828 and return a pointer to it.
2831 static struct symbol
*
2832 new_symbol (dip
, objfile
)
2833 struct dieinfo
*dip
;
2834 struct objfile
*objfile
;
2836 struct symbol
*sym
= NULL
;
2838 if (dip
-> at_name
!= NULL
)
2840 sym
= (struct symbol
*) obstack_alloc (&objfile
-> symbol_obstack
,
2841 sizeof (struct symbol
));
2842 memset (sym
, 0, sizeof (struct symbol
));
2843 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2844 &objfile
->symbol_obstack
);
2845 /* default assumptions */
2846 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2847 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2848 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2849 switch (dip
-> die_tag
)
2852 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2853 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2855 case TAG_global_subroutine
:
2856 case TAG_subroutine
:
2857 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2858 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2859 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2860 if (dip
-> die_tag
== TAG_global_subroutine
)
2862 add_symbol_to_list (sym
, &global_symbols
);
2866 add_symbol_to_list (sym
, list_in_scope
);
2869 case TAG_global_variable
:
2870 if (dip
-> at_location
!= NULL
)
2872 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2873 add_symbol_to_list (sym
, &global_symbols
);
2874 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2875 SYMBOL_VALUE (sym
) += baseaddr
;
2878 case TAG_local_variable
:
2879 if (dip
-> at_location
!= NULL
)
2881 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2882 add_symbol_to_list (sym
, list_in_scope
);
2885 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2889 SYMBOL_CLASS (sym
) = LOC_LOCAL
;
2893 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2894 SYMBOL_VALUE (sym
) += baseaddr
;
2898 case TAG_formal_parameter
:
2899 if (dip
-> at_location
!= NULL
)
2901 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2903 add_symbol_to_list (sym
, list_in_scope
);
2906 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
2910 SYMBOL_CLASS (sym
) = LOC_ARG
;
2913 case TAG_unspecified_parameters
:
2914 /* From varargs functions; gdb doesn't seem to have any interest in
2915 this information, so just ignore it for now. (FIXME?) */
2917 case TAG_class_type
:
2918 case TAG_structure_type
:
2919 case TAG_union_type
:
2920 case TAG_enumeration_type
:
2921 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2922 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
2923 add_symbol_to_list (sym
, list_in_scope
);
2926 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2927 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2928 add_symbol_to_list (sym
, list_in_scope
);
2931 /* Not a tag we recognize. Hopefully we aren't processing trash
2932 data, but since we must specifically ignore things we don't
2933 recognize, there is nothing else we should do at this point. */
2944 synthesize_typedef -- make a symbol table entry for a "fake" typedef
2948 static void synthesize_typedef (struct dieinfo *dip,
2949 struct objfile *objfile,
2954 Given a pointer to a DWARF information entry, synthesize a typedef
2955 for the name in the DIE, using the specified type.
2957 This is used for C++ class, structs, unions, and enumerations to
2958 set up the tag name as a type.
2963 synthesize_typedef (dip
, objfile
, type
)
2964 struct dieinfo
*dip
;
2965 struct objfile
*objfile
;
2968 struct symbol
*sym
= NULL
;
2970 if (dip
-> at_name
!= NULL
)
2972 sym
= (struct symbol
*)
2973 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symbol
));
2974 memset (sym
, 0, sizeof (struct symbol
));
2975 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2976 &objfile
->symbol_obstack
);
2977 SYMBOL_TYPE (sym
) = type
;
2978 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2979 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2980 add_symbol_to_list (sym
, list_in_scope
);
2988 decode_mod_fund_type -- decode a modified fundamental type
2992 static struct type *decode_mod_fund_type (char *typedata)
2996 Decode a block of data containing a modified fundamental
2997 type specification. TYPEDATA is a pointer to the block,
2998 which starts with a length containing the size of the rest
2999 of the block. At the end of the block is a fundmental type
3000 code value that gives the fundamental type. Everything
3001 in between are type modifiers.
3003 We simply compute the number of modifiers and call the general
3004 function decode_modified_type to do the actual work.
3007 static struct type
*
3008 decode_mod_fund_type (typedata
)
3011 struct type
*typep
= NULL
;
3012 unsigned short modcount
;
3015 /* Get the total size of the block, exclusive of the size itself */
3017 nbytes
= attribute_size (AT_mod_fund_type
);
3018 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3021 /* Deduct the size of the fundamental type bytes at the end of the block. */
3023 modcount
-= attribute_size (AT_fund_type
);
3025 /* Now do the actual decoding */
3027 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3035 decode_mod_u_d_type -- decode a modified user defined type
3039 static struct type *decode_mod_u_d_type (char *typedata)
3043 Decode a block of data containing a modified user defined
3044 type specification. TYPEDATA is a pointer to the block,
3045 which consists of a two byte length, containing the size
3046 of the rest of the block. At the end of the block is a
3047 four byte value that gives a reference to a user defined type.
3048 Everything in between are type modifiers.
3050 We simply compute the number of modifiers and call the general
3051 function decode_modified_type to do the actual work.
3054 static struct type
*
3055 decode_mod_u_d_type (typedata
)
3058 struct type
*typep
= NULL
;
3059 unsigned short modcount
;
3062 /* Get the total size of the block, exclusive of the size itself */
3064 nbytes
= attribute_size (AT_mod_u_d_type
);
3065 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3068 /* Deduct the size of the reference type bytes at the end of the block. */
3070 modcount
-= attribute_size (AT_user_def_type
);
3072 /* Now do the actual decoding */
3074 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3082 decode_modified_type -- decode modified user or fundamental type
3086 static struct type *decode_modified_type (char *modifiers,
3087 unsigned short modcount, int mtype)
3091 Decode a modified type, either a modified fundamental type or
3092 a modified user defined type. MODIFIERS is a pointer to the
3093 block of bytes that define MODCOUNT modifiers. Immediately
3094 following the last modifier is a short containing the fundamental
3095 type or a long containing the reference to the user defined
3096 type. Which one is determined by MTYPE, which is either
3097 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3098 type we are generating.
3100 We call ourself recursively to generate each modified type,`
3101 until MODCOUNT reaches zero, at which point we have consumed
3102 all the modifiers and generate either the fundamental type or
3103 user defined type. When the recursion unwinds, each modifier
3104 is applied in turn to generate the full modified type.
3108 If we find a modifier that we don't recognize, and it is not one
3109 of those reserved for application specific use, then we issue a
3110 warning and simply ignore the modifier.
3114 We currently ignore MOD_const and MOD_volatile. (FIXME)
3118 static struct type
*
3119 decode_modified_type (modifiers
, modcount
, mtype
)
3121 unsigned int modcount
;
3124 struct type
*typep
= NULL
;
3125 unsigned short fundtype
;
3134 case AT_mod_fund_type
:
3135 nbytes
= attribute_size (AT_fund_type
);
3136 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3138 typep
= decode_fund_type (fundtype
);
3140 case AT_mod_u_d_type
:
3141 nbytes
= attribute_size (AT_user_def_type
);
3142 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3144 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3146 typep
= alloc_utype (die_ref
, NULL
);
3150 SQUAWK (("botched modified type decoding (mtype 0x%x)", mtype
));
3151 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3157 modifier
= *modifiers
++;
3158 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3161 case MOD_pointer_to
:
3162 typep
= lookup_pointer_type (typep
);
3164 case MOD_reference_to
:
3165 typep
= lookup_reference_type (typep
);
3168 SQUAWK (("type modifier 'const' ignored")); /* FIXME */
3171 SQUAWK (("type modifier 'volatile' ignored")); /* FIXME */
3174 if (!(MOD_lo_user
<= (unsigned char) modifier
3175 && (unsigned char) modifier
<= MOD_hi_user
))
3177 SQUAWK (("unknown type modifier %u",
3178 (unsigned char) modifier
));
3190 decode_fund_type -- translate basic DWARF type to gdb base type
3194 Given an integer that is one of the fundamental DWARF types,
3195 translate it to one of the basic internal gdb types and return
3196 a pointer to the appropriate gdb type (a "struct type *").
3200 If we encounter a fundamental type that we are unprepared to
3201 deal with, and it is not in the range of those types defined
3202 as application specific types, then we issue a warning and
3203 treat the type as an "int".
3206 static struct type
*
3207 decode_fund_type (fundtype
)
3208 unsigned int fundtype
;
3210 struct type
*typep
= NULL
;
3216 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3219 case FT_boolean
: /* Was FT_set in AT&T version */
3220 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3223 case FT_pointer
: /* (void *) */
3224 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3225 typep
= lookup_pointer_type (typep
);
3229 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3232 case FT_signed_char
:
3233 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3236 case FT_unsigned_char
:
3237 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3241 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3244 case FT_signed_short
:
3245 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3248 case FT_unsigned_short
:
3249 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3253 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3256 case FT_signed_integer
:
3257 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3260 case FT_unsigned_integer
:
3261 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3265 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3268 case FT_signed_long
:
3269 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3272 case FT_unsigned_long
:
3273 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3277 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3280 case FT_signed_long_long
:
3281 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3284 case FT_unsigned_long_long
:
3285 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3289 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3292 case FT_dbl_prec_float
:
3293 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3296 case FT_ext_prec_float
:
3297 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3301 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3304 case FT_dbl_prec_complex
:
3305 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3308 case FT_ext_prec_complex
:
3309 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3314 if ((typep
== NULL
) && !(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3316 SQUAWK (("unexpected fundamental type 0x%x", fundtype
));
3317 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3327 create_name -- allocate a fresh copy of a string on an obstack
3331 Given a pointer to a string and a pointer to an obstack, allocates
3332 a fresh copy of the string on the specified obstack.
3337 create_name (name
, obstackp
)
3339 struct obstack
*obstackp
;
3344 length
= strlen (name
) + 1;
3345 newname
= (char *) obstack_alloc (obstackp
, length
);
3346 strcpy (newname
, name
);
3354 basicdieinfo -- extract the minimal die info from raw die data
3358 void basicdieinfo (char *diep, struct dieinfo *dip,
3359 struct objfile *objfile)
3363 Given a pointer to raw DIE data, and a pointer to an instance of a
3364 die info structure, this function extracts the basic information
3365 from the DIE data required to continue processing this DIE, along
3366 with some bookkeeping information about the DIE.
3368 The information we absolutely must have includes the DIE tag,
3369 and the DIE length. If we need the sibling reference, then we
3370 will have to call completedieinfo() to process all the remaining
3373 Note that since there is no guarantee that the data is properly
3374 aligned in memory for the type of access required (indirection
3375 through anything other than a char pointer), and there is no
3376 guarantee that it is in the same byte order as the gdb host,
3377 we call a function which deals with both alignment and byte
3378 swapping issues. Possibly inefficient, but quite portable.
3380 We also take care of some other basic things at this point, such
3381 as ensuring that the instance of the die info structure starts
3382 out completely zero'd and that curdie is initialized for use
3383 in error reporting if we have a problem with the current die.
3387 All DIE's must have at least a valid length, thus the minimum
3388 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3389 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3390 are forced to be TAG_padding DIES.
3392 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3393 that if a padding DIE is used for alignment and the amount needed is
3394 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3395 enough to align to the next alignment boundry.
3397 We do some basic sanity checking here, such as verifying that the
3398 length of the die would not cause it to overrun the recorded end of
3399 the buffer holding the DIE info. If we find a DIE that is either
3400 too small or too large, we force it's length to zero which should
3401 cause the caller to take appropriate action.
3405 basicdieinfo (dip
, diep
, objfile
)
3406 struct dieinfo
*dip
;
3408 struct objfile
*objfile
;
3411 memset (dip
, 0, sizeof (struct dieinfo
));
3413 dip
-> die_ref
= dbroff
+ (diep
- dbbase
);
3414 dip
-> die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3416 if ((dip
-> die_length
< SIZEOF_DIE_LENGTH
) ||
3417 ((diep
+ dip
-> die_length
) > (dbbase
+ dbsize
)))
3419 dwarfwarn ("malformed DIE, bad length (%d bytes)", dip
-> die_length
);
3420 dip
-> die_length
= 0;
3422 else if (dip
-> die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3424 dip
-> die_tag
= TAG_padding
;
3428 diep
+= SIZEOF_DIE_LENGTH
;
3429 dip
-> die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3438 completedieinfo -- finish reading the information for a given DIE
3442 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3446 Given a pointer to an already partially initialized die info structure,
3447 scan the raw DIE data and finish filling in the die info structure
3448 from the various attributes found.
3450 Note that since there is no guarantee that the data is properly
3451 aligned in memory for the type of access required (indirection
3452 through anything other than a char pointer), and there is no
3453 guarantee that it is in the same byte order as the gdb host,
3454 we call a function which deals with both alignment and byte
3455 swapping issues. Possibly inefficient, but quite portable.
3459 Each time we are called, we increment the diecount variable, which
3460 keeps an approximate count of the number of dies processed for
3461 each compilation unit. This information is presented to the user
3462 if the info_verbose flag is set.
3467 completedieinfo (dip
, objfile
)
3468 struct dieinfo
*dip
;
3469 struct objfile
*objfile
;
3471 char *diep
; /* Current pointer into raw DIE data */
3472 char *end
; /* Terminate DIE scan here */
3473 unsigned short attr
; /* Current attribute being scanned */
3474 unsigned short form
; /* Form of the attribute */
3475 int nbytes
; /* Size of next field to read */
3479 end
= diep
+ dip
-> die_length
;
3480 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3483 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3484 diep
+= SIZEOF_ATTRIBUTE
;
3485 if ((nbytes
= attribute_size (attr
)) == -1)
3487 SQUAWK (("unknown attribute length, skipped remaining attributes"));;
3494 dip
-> at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3498 dip
-> at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3502 dip
-> at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3506 dip
-> at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3510 dip
-> at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3512 dip
-> has_at_stmt_list
= 1;
3515 dip
-> at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3517 dip
-> at_low_pc
+= baseaddr
;
3518 dip
-> has_at_low_pc
= 1;
3521 dip
-> at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3523 dip
-> at_high_pc
+= baseaddr
;
3526 dip
-> at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3529 case AT_user_def_type
:
3530 dip
-> at_user_def_type
= target_to_host (diep
, nbytes
,
3531 GET_UNSIGNED
, objfile
);
3534 dip
-> at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3536 dip
-> has_at_byte_size
= 1;
3539 dip
-> at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3543 dip
-> at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3547 dip
-> at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3551 dip
-> at_location
= diep
;
3553 case AT_mod_fund_type
:
3554 dip
-> at_mod_fund_type
= diep
;
3556 case AT_subscr_data
:
3557 dip
-> at_subscr_data
= diep
;
3559 case AT_mod_u_d_type
:
3560 dip
-> at_mod_u_d_type
= diep
;
3562 case AT_element_list
:
3563 dip
-> at_element_list
= diep
;
3564 dip
-> short_element_list
= 0;
3566 case AT_short_element_list
:
3567 dip
-> at_element_list
= diep
;
3568 dip
-> short_element_list
= 1;
3570 case AT_discr_value
:
3571 dip
-> at_discr_value
= diep
;
3573 case AT_string_length
:
3574 dip
-> at_string_length
= diep
;
3577 dip
-> at_name
= diep
;
3580 /* For now, ignore any "hostname:" portion, since gdb doesn't
3581 know how to deal with it. (FIXME). */
3582 dip
-> at_comp_dir
= strrchr (diep
, ':');
3583 if (dip
-> at_comp_dir
!= NULL
)
3585 dip
-> at_comp_dir
++;
3589 dip
-> at_comp_dir
= diep
;
3593 dip
-> at_producer
= diep
;
3595 case AT_start_scope
:
3596 dip
-> at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3599 case AT_stride_size
:
3600 dip
-> at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3604 dip
-> at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3608 dip
-> at_prototyped
= diep
;
3611 /* Found an attribute that we are unprepared to handle. However
3612 it is specifically one of the design goals of DWARF that
3613 consumers should ignore unknown attributes. As long as the
3614 form is one that we recognize (so we know how to skip it),
3615 we can just ignore the unknown attribute. */
3618 form
= FORM_FROM_ATTR (attr
);
3632 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3635 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3638 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3641 diep
+= strlen (diep
) + 1;
3644 SQUAWK (("unknown attribute form (0x%x)", form
));
3645 SQUAWK (("unknown attribute length, skipped remaining attributes"));;
3656 target_to_host -- swap in target data to host
3660 target_to_host (char *from, int nbytes, int signextend,
3661 struct objfile *objfile)
3665 Given pointer to data in target format in FROM, a byte count for
3666 the size of the data in NBYTES, a flag indicating whether or not
3667 the data is signed in SIGNEXTEND, and a pointer to the current
3668 objfile in OBJFILE, convert the data to host format and return
3669 the converted value.
3673 FIXME: If we read data that is known to be signed, and expect to
3674 use it as signed data, then we need to explicitly sign extend the
3675 result until the bfd library is able to do this for us.
3679 static unsigned long
3680 target_to_host (from
, nbytes
, signextend
, objfile
)
3683 int signextend
; /* FIXME: Unused */
3684 struct objfile
*objfile
;
3686 unsigned long rtnval
;
3691 rtnval
= bfd_get_64 (objfile
-> obfd
, (bfd_byte
*) from
);
3694 rtnval
= bfd_get_32 (objfile
-> obfd
, (bfd_byte
*) from
);
3697 rtnval
= bfd_get_16 (objfile
-> obfd
, (bfd_byte
*) from
);
3700 rtnval
= bfd_get_8 (objfile
-> obfd
, (bfd_byte
*) from
);
3703 dwarfwarn ("no bfd support for %d byte data object", nbytes
);
3714 attribute_size -- compute size of data for a DWARF attribute
3718 static int attribute_size (unsigned int attr)
3722 Given a DWARF attribute in ATTR, compute the size of the first
3723 piece of data associated with this attribute and return that
3726 Returns -1 for unrecognized attributes.
3731 attribute_size (attr
)
3734 int nbytes
; /* Size of next data for this attribute */
3735 unsigned short form
; /* Form of the attribute */
3737 form
= FORM_FROM_ATTR (attr
);
3740 case FORM_STRING
: /* A variable length field is next */
3743 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3744 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3747 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3748 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3749 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3752 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3755 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3756 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3759 SQUAWK (("unknown attribute form (0x%x)", form
));