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 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1304 scan
+= SIZEOF_FMT_FT
;
1305 if (fundtype
!= FT_integer
&& fundtype
!= FT_signed_integer
1306 && fundtype
!= FT_unsigned_integer
)
1308 SQUAWK (("array subscripts must be integral types, not type 0x%x",
1313 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1314 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1317 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1320 nexttype
= decode_subscr_data (scan
, end
);
1321 if (nexttype
!= NULL
)
1323 typep
= alloc_type (current_objfile
);
1324 TYPE_CODE (typep
) = TYPE_CODE_ARRAY
;
1325 TYPE_LENGTH (typep
) = TYPE_LENGTH (nexttype
);
1326 TYPE_LENGTH (typep
) *= (highbound
- lowbound
) + 1;
1327 TYPE_TARGET_TYPE (typep
) = nexttype
;
1338 SQUAWK (("array subscript format 0x%x not handled yet", format
));
1341 SQUAWK (("unknown array subscript format %x", format
));
1351 dwarf_read_array_type -- read TAG_array_type DIE
1355 static void dwarf_read_array_type (struct dieinfo *dip)
1359 Extract all information from a TAG_array_type DIE and add to
1360 the user defined type vector.
1364 dwarf_read_array_type (dip
)
1365 struct dieinfo
*dip
;
1371 unsigned short blocksz
;
1374 if (dip
-> at_ordering
!= ORD_row_major
)
1376 /* FIXME: Can gdb even handle column major arrays? */
1377 SQUAWK (("array not row major; not handled correctly"));
1379 if ((sub
= dip
-> at_subscr_data
) != NULL
)
1381 nbytes
= attribute_size (AT_subscr_data
);
1382 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1383 subend
= sub
+ nbytes
+ blocksz
;
1385 type
= decode_subscr_data (sub
, subend
);
1388 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1390 utype
= alloc_utype (dip
-> die_ref
, NULL
);
1392 TYPE_CODE (utype
) = TYPE_CODE_ARRAY
;
1393 TYPE_TARGET_TYPE (utype
) =
1394 dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
1395 TYPE_LENGTH (utype
) = 1 * TYPE_LENGTH (TYPE_TARGET_TYPE (utype
));
1399 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1401 alloc_utype (dip
-> die_ref
, type
);
1405 TYPE_CODE (utype
) = TYPE_CODE_ARRAY
;
1406 TYPE_LENGTH (utype
) = TYPE_LENGTH (type
);
1407 TYPE_TARGET_TYPE (utype
) = TYPE_TARGET_TYPE (type
);
1417 read_tag_pointer_type -- read TAG_pointer_type DIE
1421 static void read_tag_pointer_type (struct dieinfo *dip)
1425 Extract all information from a TAG_pointer_type DIE and add to
1426 the user defined type vector.
1430 read_tag_pointer_type (dip
)
1431 struct dieinfo
*dip
;
1436 type
= decode_die_type (dip
);
1437 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1439 utype
= lookup_pointer_type (type
);
1440 alloc_utype (dip
-> die_ref
, utype
);
1444 TYPE_TARGET_TYPE (utype
) = type
;
1445 TYPE_POINTER_TYPE (type
) = utype
;
1447 /* We assume the machine has only one representation for pointers! */
1448 /* FIXME: This confuses host<->target data representations, and is a
1449 poor assumption besides. */
1451 TYPE_LENGTH (utype
) = sizeof (char *);
1452 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1460 read_subroutine_type -- process TAG_subroutine_type dies
1464 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1469 Handle DIES due to C code like:
1472 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1478 The parameter DIES are currently ignored. See if gdb has a way to
1479 include this info in it's type system, and decode them if so. Is
1480 this what the type structure's "arg_types" field is for? (FIXME)
1484 read_subroutine_type (dip
, thisdie
, enddie
)
1485 struct dieinfo
*dip
;
1489 struct type
*type
; /* Type that this function returns */
1490 struct type
*ftype
; /* Function that returns above type */
1492 /* Decode the type that this subroutine returns */
1494 type
= decode_die_type (dip
);
1496 /* Check to see if we already have a partially constructed user
1497 defined type for this DIE, from a forward reference. */
1499 if ((ftype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1501 /* This is the first reference to one of these types. Make
1502 a new one and place it in the user defined types. */
1503 ftype
= lookup_function_type (type
);
1504 alloc_utype (dip
-> die_ref
, ftype
);
1508 /* We have an existing partially constructed type, so bash it
1509 into the correct type. */
1510 TYPE_TARGET_TYPE (ftype
) = type
;
1511 TYPE_FUNCTION_TYPE (type
) = ftype
;
1512 TYPE_LENGTH (ftype
) = 1;
1513 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1521 read_enumeration -- process dies which define an enumeration
1525 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1526 char *enddie, struct objfile *objfile)
1530 Given a pointer to a die which begins an enumeration, process all
1531 the dies that define the members of the enumeration.
1535 Note that we need to call enum_type regardless of whether or not we
1536 have a symbol, since we might have an enum without a tag name (thus
1537 no symbol for the tagname).
1541 read_enumeration (dip
, thisdie
, enddie
, objfile
)
1542 struct dieinfo
*dip
;
1545 struct objfile
*objfile
;
1550 type
= enum_type (dip
, objfile
);
1551 sym
= new_symbol (dip
, objfile
);
1554 SYMBOL_TYPE (sym
) = type
;
1555 if (cu_language
== language_cplus
)
1557 synthesize_typedef (dip
, objfile
, type
);
1566 enum_type -- decode and return a type for an enumeration
1570 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1574 Given a pointer to a die information structure for the die which
1575 starts an enumeration, process all the dies that define the members
1576 of the enumeration and return a type pointer for the enumeration.
1578 At the same time, for each member of the enumeration, create a
1579 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1580 and give it the type of the enumeration itself.
1584 Note that the DWARF specification explicitly mandates that enum
1585 constants occur in reverse order from the source program order,
1586 for "consistency" and because this ordering is easier for many
1587 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1588 Entries). Because gdb wants to see the enum members in program
1589 source order, we have to ensure that the order gets reversed while
1590 we are processing them.
1593 static struct type
*
1594 enum_type (dip
, objfile
)
1595 struct dieinfo
*dip
;
1596 struct objfile
*objfile
;
1600 struct nextfield
*next
;
1603 struct nextfield
*list
= NULL
;
1604 struct nextfield
*new;
1609 unsigned short blocksz
;
1613 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1615 /* No forward references created an empty type, so install one now */
1616 type
= alloc_utype (dip
-> die_ref
, NULL
);
1618 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1619 /* Some compilers try to be helpful by inventing "fake" names for
1620 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1621 Thanks, but no thanks... */
1622 if (dip
-> at_name
!= NULL
1623 && *dip
-> at_name
!= '~'
1624 && *dip
-> at_name
!= '.')
1626 TYPE_NAME (type
) = obconcat (&objfile
-> type_obstack
, "enum",
1627 " ", dip
-> at_name
);
1629 if (dip
-> at_byte_size
!= 0)
1631 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1633 if ((scan
= dip
-> at_element_list
) != NULL
)
1635 if (dip
-> short_element_list
)
1637 nbytes
= attribute_size (AT_short_element_list
);
1641 nbytes
= attribute_size (AT_element_list
);
1643 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1644 listend
= scan
+ nbytes
+ blocksz
;
1646 while (scan
< listend
)
1648 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1651 list
-> field
.type
= NULL
;
1652 list
-> field
.bitsize
= 0;
1653 list
-> field
.bitpos
=
1654 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1656 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1657 list
-> field
.name
= obsavestring (scan
, strlen (scan
),
1658 &objfile
-> type_obstack
);
1659 scan
+= strlen (scan
) + 1;
1661 /* Handcraft a new symbol for this enum member. */
1662 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1663 sizeof (struct symbol
));
1664 memset (sym
, 0, sizeof (struct symbol
));
1665 SYMBOL_NAME (sym
) = create_name (list
-> field
.name
,
1666 &objfile
->symbol_obstack
);
1667 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1668 SYMBOL_CLASS (sym
) = LOC_CONST
;
1669 SYMBOL_TYPE (sym
) = type
;
1670 SYMBOL_VALUE (sym
) = list
-> field
.bitpos
;
1671 add_symbol_to_list (sym
, list_in_scope
);
1673 /* Now create the vector of fields, and record how big it is. This is
1674 where we reverse the order, by pulling the members off the list in
1675 reverse order from how they were inserted. If we have no fields
1676 (this is apparently possible in C++) then skip building a field
1680 TYPE_NFIELDS (type
) = nfields
;
1681 TYPE_FIELDS (type
) = (struct field
*)
1682 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1683 /* Copy the saved-up fields into the field vector. */
1684 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
-> next
)
1686 TYPE_FIELD (type
, n
++) = list
-> field
;
1697 read_func_scope -- process all dies within a function scope
1701 Process all dies within a given function scope. We are passed
1702 a die information structure pointer DIP for the die which
1703 starts the function scope, and pointers into the raw die data
1704 that define the dies within the function scope.
1706 For now, we ignore lexical block scopes within the function.
1707 The problem is that AT&T cc does not define a DWARF lexical
1708 block scope for the function itself, while gcc defines a
1709 lexical block scope for the function. We need to think about
1710 how to handle this difference, or if it is even a problem.
1715 read_func_scope (dip
, thisdie
, enddie
, objfile
)
1716 struct dieinfo
*dip
;
1719 struct objfile
*objfile
;
1721 register struct context_stack
*new;
1723 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1724 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1726 objfile
-> ei
.entry_func_lowpc
= dip
-> at_low_pc
;
1727 objfile
-> ei
.entry_func_highpc
= dip
-> at_high_pc
;
1729 if (STREQ (dip
-> at_name
, "main")) /* FIXME: hardwired name */
1731 objfile
-> ei
.main_func_lowpc
= dip
-> at_low_pc
;
1732 objfile
-> ei
.main_func_highpc
= dip
-> at_high_pc
;
1734 new = push_context (0, dip
-> at_low_pc
);
1735 new -> name
= new_symbol (dip
, objfile
);
1736 list_in_scope
= &local_symbols
;
1737 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1738 new = pop_context ();
1739 /* Make a block for the local symbols within. */
1740 finish_block (new -> name
, &local_symbols
, new -> old_blocks
,
1741 new -> start_addr
, dip
-> at_high_pc
, objfile
);
1742 list_in_scope
= &file_symbols
;
1750 handle_producer -- process the AT_producer attribute
1754 Perform any operations that depend on finding a particular
1755 AT_producer attribute.
1760 handle_producer (producer
)
1764 /* If this compilation unit was compiled with g++ or gcc, then set the
1765 processing_gcc_compilation flag. */
1767 processing_gcc_compilation
=
1768 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
))
1769 /* start-sanitize-chill */
1770 || STREQN (producer
, CHILL_PRODUCER
, strlen (CHILL_PRODUCER
))
1771 /* end-sanitize-chill */
1772 || STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
));
1774 /* Select a demangling style if we can identify the producer and if
1775 the current style is auto. We leave the current style alone if it
1776 is not auto. We also leave the demangling style alone if we find a
1777 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1779 #if 1 /* Works, but is experimental. -fnf */
1780 if (AUTO_DEMANGLING
)
1782 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1784 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1786 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1788 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1790 else if (STREQN (producer
, CFRONT_PRODUCER
, strlen (CFRONT_PRODUCER
)))
1792 set_demangling_style (CFRONT_DEMANGLING_STYLE_STRING
);
1803 read_file_scope -- process all dies within a file scope
1807 Process all dies within a given file scope. We are passed a
1808 pointer to the die information structure for the die which
1809 starts the file scope, and pointers into the raw die data which
1810 mark the range of dies within the file scope.
1812 When the partial symbol table is built, the file offset for the line
1813 number table for each compilation unit is saved in the partial symbol
1814 table entry for that compilation unit. As the symbols for each
1815 compilation unit are read, the line number table is read into memory
1816 and the variable lnbase is set to point to it. Thus all we have to
1817 do is use lnbase to access the line number table for the current
1822 read_file_scope (dip
, thisdie
, enddie
, objfile
)
1823 struct dieinfo
*dip
;
1826 struct objfile
*objfile
;
1828 struct cleanup
*back_to
;
1829 struct symtab
*symtab
;
1831 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1832 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1834 objfile
-> ei
.entry_file_lowpc
= dip
-> at_low_pc
;
1835 objfile
-> ei
.entry_file_highpc
= dip
-> at_high_pc
;
1837 set_cu_language (dip
);
1838 if (dip
-> at_producer
!= NULL
)
1840 handle_producer (dip
-> at_producer
);
1842 numutypes
= (enddie
- thisdie
) / 4;
1843 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1844 back_to
= make_cleanup (free
, utypes
);
1845 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1846 memset (ftypes
, 0, FT_NUM_MEMBERS
* sizeof (struct type
*));
1847 start_symtab (dip
-> at_name
, dip
-> at_comp_dir
, dip
-> at_low_pc
);
1848 decode_line_numbers (lnbase
);
1849 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1850 symtab
= end_symtab (dip
-> at_high_pc
, 0, 0, objfile
);
1853 symtab
-> language
= cu_language
;
1855 do_cleanups (back_to
);
1864 process_dies -- process a range of DWARF Information Entries
1868 static void process_dies (char *thisdie, char *enddie,
1869 struct objfile *objfile)
1873 Process all DIE's in a specified range. May be (and almost
1874 certainly will be) called recursively.
1878 process_dies (thisdie
, enddie
, objfile
)
1881 struct objfile
*objfile
;
1886 while (thisdie
< enddie
)
1888 basicdieinfo (&di
, thisdie
, objfile
);
1889 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1893 else if (di
.die_tag
== TAG_padding
)
1895 nextdie
= thisdie
+ di
.die_length
;
1899 completedieinfo (&di
, objfile
);
1900 if (di
.at_sibling
!= 0)
1902 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1906 nextdie
= thisdie
+ di
.die_length
;
1910 case TAG_compile_unit
:
1911 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
1913 case TAG_global_subroutine
:
1914 case TAG_subroutine
:
1915 if (di
.has_at_low_pc
)
1917 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
1920 case TAG_lexical_block
:
1921 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
1923 case TAG_class_type
:
1924 case TAG_structure_type
:
1925 case TAG_union_type
:
1926 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
1928 case TAG_enumeration_type
:
1929 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
1931 case TAG_subroutine_type
:
1932 read_subroutine_type (&di
, thisdie
, nextdie
);
1934 case TAG_array_type
:
1935 dwarf_read_array_type (&di
);
1937 case TAG_pointer_type
:
1938 read_tag_pointer_type (&di
);
1941 new_symbol (&di
, objfile
);
1953 decode_line_numbers -- decode a line number table fragment
1957 static void decode_line_numbers (char *tblscan, char *tblend,
1958 long length, long base, long line, long pc)
1962 Translate the DWARF line number information to gdb form.
1964 The ".line" section contains one or more line number tables, one for
1965 each ".line" section from the objects that were linked.
1967 The AT_stmt_list attribute for each TAG_source_file entry in the
1968 ".debug" section contains the offset into the ".line" section for the
1969 start of the table for that file.
1971 The table itself has the following structure:
1973 <table length><base address><source statement entry>
1974 4 bytes 4 bytes 10 bytes
1976 The table length is the total size of the table, including the 4 bytes
1977 for the length information.
1979 The base address is the address of the first instruction generated
1980 for the source file.
1982 Each source statement entry has the following structure:
1984 <line number><statement position><address delta>
1985 4 bytes 2 bytes 4 bytes
1987 The line number is relative to the start of the file, starting with
1990 The statement position either -1 (0xFFFF) or the number of characters
1991 from the beginning of the line to the beginning of the statement.
1993 The address delta is the difference between the base address and
1994 the address of the first instruction for the statement.
1996 Note that we must copy the bytes from the packed table to our local
1997 variables before attempting to use them, to avoid alignment problems
1998 on some machines, particularly RISC processors.
2002 Does gdb expect the line numbers to be sorted? They are now by
2003 chance/luck, but are not required to be. (FIXME)
2005 The line with number 0 is unused, gdb apparently can discover the
2006 span of the last line some other way. How? (FIXME)
2010 decode_line_numbers (linetable
)
2015 unsigned long length
;
2020 if (linetable
!= NULL
)
2022 tblscan
= tblend
= linetable
;
2023 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
2025 tblscan
+= SIZEOF_LINETBL_LENGTH
;
2027 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
2028 GET_UNSIGNED
, current_objfile
);
2029 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
2031 while (tblscan
< tblend
)
2033 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
2035 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
2036 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
2038 tblscan
+= SIZEOF_LINETBL_DELTA
;
2042 record_line (current_subfile
, line
, pc
);
2052 locval -- compute the value of a location attribute
2056 static int locval (char *loc)
2060 Given pointer to a string of bytes that define a location, compute
2061 the location and return the value.
2063 When computing values involving the current value of the frame pointer,
2064 the value zero is used, which results in a value relative to the frame
2065 pointer, rather than the absolute value. This is what GDB wants
2068 When the result is a register number, the global isreg flag is set,
2069 otherwise it is cleared. This is a kludge until we figure out a better
2070 way to handle the problem. Gdb's design does not mesh well with the
2071 DWARF notion of a location computing interpreter, which is a shame
2072 because the flexibility goes unused.
2076 Note that stack[0] is unused except as a default error return.
2077 Note that stack overflow is not yet handled.
2084 unsigned short nbytes
;
2085 unsigned short locsize
;
2086 auto long stack
[64];
2093 nbytes
= attribute_size (AT_location
);
2094 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
2096 end
= loc
+ locsize
;
2101 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2104 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2106 loc
+= SIZEOF_LOC_ATOM_CODE
;
2107 switch (loc_atom_code
)
2114 /* push register (number) */
2115 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2116 GET_UNSIGNED
, current_objfile
);
2117 loc
+= loc_value_size
;
2121 /* push value of register (number) */
2122 /* Actually, we compute the value as if register has 0 */
2124 regno
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2126 loc
+= loc_value_size
;
2129 stack
[++stacki
] = 0;
2133 stack
[++stacki
] = 0;
2134 SQUAWK (("BASEREG %d not handled!", regno
));
2138 /* push address (relocated address) */
2139 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2140 GET_UNSIGNED
, current_objfile
);
2141 loc
+= loc_value_size
;
2144 /* push constant (number) FIXME: signed or unsigned! */
2145 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2146 GET_SIGNED
, current_objfile
);
2147 loc
+= loc_value_size
;
2150 /* pop, deref and push 2 bytes (as a long) */
2151 SQUAWK (("OP_DEREF2 address 0x%x not handled", stack
[stacki
]));
2153 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2154 SQUAWK (("OP_DEREF4 address 0x%x not handled", stack
[stacki
]));
2156 case OP_ADD
: /* pop top 2 items, add, push result */
2157 stack
[stacki
- 1] += stack
[stacki
];
2162 return (stack
[stacki
]);
2169 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2173 static struct symtab *read_ofile_symtab (struct partial_symtab *pst)
2177 When expanding a partial symbol table entry to a full symbol table
2178 entry, this is the function that gets called to read in the symbols
2179 for the compilation unit.
2181 Returns a pointer to the newly constructed symtab (which is now
2182 the new first one on the objfile's symtab list).
2185 static struct symtab
*
2186 read_ofile_symtab (pst
)
2187 struct partial_symtab
*pst
;
2189 struct cleanup
*back_to
;
2190 unsigned long lnsize
;
2193 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2195 abfd
= pst
-> objfile
-> obfd
;
2196 current_objfile
= pst
-> objfile
;
2198 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2199 unit, seek to the location in the file, and read in all the DIE's. */
2202 dbsize
= DBLENGTH (pst
);
2203 dbbase
= xmalloc (dbsize
);
2204 dbroff
= DBROFF(pst
);
2205 foffset
= DBFOFF(pst
) + dbroff
;
2206 base_section_offsets
= pst
->section_offsets
;
2207 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2208 if (bfd_seek (abfd
, foffset
, L_SET
) ||
2209 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
2212 error ("can't read DWARF data");
2214 back_to
= make_cleanup (free
, dbbase
);
2216 /* If there is a line number table associated with this compilation unit
2217 then read the size of this fragment in bytes, from the fragment itself.
2218 Allocate a buffer for the fragment and read it in for future
2224 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2225 (bfd_read ((PTR
) lnsizedata
, sizeof (lnsizedata
), 1, abfd
) !=
2226 sizeof (lnsizedata
)))
2228 error ("can't read DWARF line number table size");
2230 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2231 GET_UNSIGNED
, pst
-> objfile
);
2232 lnbase
= xmalloc (lnsize
);
2233 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2234 (bfd_read (lnbase
, lnsize
, 1, abfd
) != lnsize
))
2237 error ("can't read DWARF line numbers");
2239 make_cleanup (free
, lnbase
);
2242 process_dies (dbbase
, dbbase
+ dbsize
, pst
-> objfile
);
2243 do_cleanups (back_to
);
2244 current_objfile
= NULL
;
2245 return (pst
-> objfile
-> symtabs
);
2252 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2256 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2260 Called once for each partial symbol table entry that needs to be
2261 expanded into a full symbol table entry.
2266 psymtab_to_symtab_1 (pst
)
2267 struct partial_symtab
*pst
;
2270 struct cleanup
*old_chain
;
2276 warning ("psymtab for %s already read in. Shouldn't happen.",
2281 /* Read in all partial symtabs on which this one is dependent */
2282 for (i
= 0; i
< pst
-> number_of_dependencies
; i
++)
2284 if (!pst
-> dependencies
[i
] -> readin
)
2286 /* Inform about additional files that need to be read in. */
2289 fputs_filtered (" ", stdout
);
2291 fputs_filtered ("and ", stdout
);
2293 printf_filtered ("%s...",
2294 pst
-> dependencies
[i
] -> filename
);
2296 fflush (stdout
); /* Flush output */
2298 psymtab_to_symtab_1 (pst
-> dependencies
[i
]);
2301 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2304 old_chain
= make_cleanup (really_free_pendings
, 0);
2305 pst
-> symtab
= read_ofile_symtab (pst
);
2308 printf_filtered ("%d DIE's, sorting...", diecount
);
2312 sort_symtab_syms (pst
-> symtab
);
2313 do_cleanups (old_chain
);
2324 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2328 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2332 This is the DWARF support entry point for building a full symbol
2333 table entry from a partial symbol table entry. We are passed a
2334 pointer to the partial symbol table entry that needs to be expanded.
2339 dwarf_psymtab_to_symtab (pst
)
2340 struct partial_symtab
*pst
;
2347 warning ("psymtab for %s already read in. Shouldn't happen.",
2352 if (DBLENGTH (pst
) || pst
-> number_of_dependencies
)
2354 /* Print the message now, before starting serious work, to avoid
2355 disconcerting pauses. */
2358 printf_filtered ("Reading in symbols for %s...",
2363 psymtab_to_symtab_1 (pst
);
2365 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2366 we need to do an equivalent or is this something peculiar to
2368 Match with global symbols. This only needs to be done once,
2369 after all of the symtabs and dependencies have been read in.
2371 scan_file_globals (pst
-> objfile
);
2374 /* Finish up the verbose info message. */
2377 printf_filtered ("done.\n");
2389 init_psymbol_list -- initialize storage for partial symbols
2393 static void init_psymbol_list (struct objfile *objfile, int total_symbols)
2397 Initializes storage for all of the partial symbols that will be
2398 created by dwarf_build_psymtabs and subsidiaries.
2402 init_psymbol_list (objfile
, total_symbols
)
2403 struct objfile
*objfile
;
2406 /* Free any previously allocated psymbol lists. */
2408 if (objfile
-> global_psymbols
.list
)
2410 mfree (objfile
-> md
, (PTR
)objfile
-> global_psymbols
.list
);
2412 if (objfile
-> static_psymbols
.list
)
2414 mfree (objfile
-> md
, (PTR
)objfile
-> static_psymbols
.list
);
2417 /* Current best guess is that there are approximately a twentieth
2418 of the total symbols (in a debugging file) are global or static
2421 objfile
-> global_psymbols
.size
= total_symbols
/ 10;
2422 objfile
-> static_psymbols
.size
= total_symbols
/ 10;
2423 objfile
-> global_psymbols
.next
=
2424 objfile
-> global_psymbols
.list
= (struct partial_symbol
*)
2425 xmmalloc (objfile
-> md
, objfile
-> global_psymbols
.size
2426 * sizeof (struct partial_symbol
));
2427 objfile
-> static_psymbols
.next
=
2428 objfile
-> static_psymbols
.list
= (struct partial_symbol
*)
2429 xmmalloc (objfile
-> md
, objfile
-> static_psymbols
.size
2430 * sizeof (struct partial_symbol
));
2437 add_enum_psymbol -- add enumeration members to partial symbol table
2441 Given pointer to a DIE that is known to be for an enumeration,
2442 extract the symbolic names of the enumeration members and add
2443 partial symbols for them.
2447 add_enum_psymbol (dip
, objfile
)
2448 struct dieinfo
*dip
;
2449 struct objfile
*objfile
;
2453 unsigned short blocksz
;
2456 if ((scan
= dip
-> at_element_list
) != NULL
)
2458 if (dip
-> short_element_list
)
2460 nbytes
= attribute_size (AT_short_element_list
);
2464 nbytes
= attribute_size (AT_element_list
);
2466 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2468 listend
= scan
+ blocksz
;
2469 while (scan
< listend
)
2471 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2472 ADD_PSYMBOL_TO_LIST (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2473 objfile
-> static_psymbols
, 0);
2474 scan
+= strlen (scan
) + 1;
2483 add_partial_symbol -- add symbol to partial symbol table
2487 Given a DIE, if it is one of the types that we want to
2488 add to a partial symbol table, finish filling in the die info
2489 and then add a partial symbol table entry for it.
2493 The caller must ensure that the DIE has a valid name attribute.
2497 add_partial_symbol (dip
, objfile
)
2498 struct dieinfo
*dip
;
2499 struct objfile
*objfile
;
2501 switch (dip
-> die_tag
)
2503 case TAG_global_subroutine
:
2504 record_minimal_symbol (dip
-> at_name
, dip
-> at_low_pc
, mst_text
,
2506 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2507 VAR_NAMESPACE
, LOC_BLOCK
,
2508 objfile
-> global_psymbols
,
2511 case TAG_global_variable
:
2512 record_minimal_symbol (dip
-> at_name
, locval (dip
-> at_location
),
2514 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2515 VAR_NAMESPACE
, LOC_STATIC
,
2516 objfile
-> global_psymbols
,
2519 case TAG_subroutine
:
2520 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2521 VAR_NAMESPACE
, LOC_BLOCK
,
2522 objfile
-> static_psymbols
,
2525 case TAG_local_variable
:
2526 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2527 VAR_NAMESPACE
, LOC_STATIC
,
2528 objfile
-> static_psymbols
,
2532 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2533 VAR_NAMESPACE
, LOC_TYPEDEF
,
2534 objfile
-> static_psymbols
,
2537 case TAG_class_type
:
2538 case TAG_structure_type
:
2539 case TAG_union_type
:
2540 case TAG_enumeration_type
:
2541 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2542 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2543 objfile
-> static_psymbols
,
2545 if (cu_language
== language_cplus
)
2547 /* For C++, these implicitly act as typedefs as well. */
2548 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2549 VAR_NAMESPACE
, LOC_TYPEDEF
,
2550 objfile
-> static_psymbols
,
2561 scan_partial_symbols -- scan DIE's within a single compilation unit
2565 Process the DIE's within a single compilation unit, looking for
2566 interesting DIE's that contribute to the partial symbol table entry
2567 for this compilation unit.
2571 There are some DIE's that may appear both at file scope and within
2572 the scope of a function. We are only interested in the ones at file
2573 scope, and the only way to tell them apart is to keep track of the
2574 scope. For example, consider the test case:
2579 for which the relevant DWARF segment has the structure:
2582 0x23 global subrtn sibling 0x9b
2584 fund_type FT_integer
2589 0x23 local var sibling 0x97
2591 fund_type FT_integer
2592 location OP_BASEREG 0xe
2599 0x1d local var sibling 0xb8
2601 fund_type FT_integer
2602 location OP_ADDR 0x800025dc
2607 We want to include the symbol 'i' in the partial symbol table, but
2608 not the symbol 'j'. In essence, we want to skip all the dies within
2609 the scope of a TAG_global_subroutine DIE.
2611 Don't attempt to add anonymous structures or unions since they have
2612 no name. Anonymous enumerations however are processed, because we
2613 want to extract their member names (the check for a tag name is
2616 Also, for variables and subroutines, check that this is the place
2617 where the actual definition occurs, rather than just a reference
2622 scan_partial_symbols (thisdie
, enddie
, objfile
)
2625 struct objfile
*objfile
;
2631 while (thisdie
< enddie
)
2633 basicdieinfo (&di
, thisdie
, objfile
);
2634 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2640 nextdie
= thisdie
+ di
.die_length
;
2641 /* To avoid getting complete die information for every die, we
2642 only do it (below) for the cases we are interested in. */
2645 case TAG_global_subroutine
:
2646 case TAG_subroutine
:
2647 completedieinfo (&di
, objfile
);
2648 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2650 add_partial_symbol (&di
, objfile
);
2651 /* If there is a sibling attribute, adjust the nextdie
2652 pointer to skip the entire scope of the subroutine.
2653 Apply some sanity checking to make sure we don't
2654 overrun or underrun the range of remaining DIE's */
2655 if (di
.at_sibling
!= 0)
2657 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2658 if ((temp
< thisdie
) || (temp
>= enddie
))
2660 dwarfwarn ("reference to DIE (0x%x) outside compilation unit", di
.at_sibling
);
2669 case TAG_global_variable
:
2670 case TAG_local_variable
:
2671 completedieinfo (&di
, objfile
);
2672 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2674 add_partial_symbol (&di
, objfile
);
2678 case TAG_class_type
:
2679 case TAG_structure_type
:
2680 case TAG_union_type
:
2681 completedieinfo (&di
, objfile
);
2684 add_partial_symbol (&di
, objfile
);
2687 case TAG_enumeration_type
:
2688 completedieinfo (&di
, objfile
);
2691 add_partial_symbol (&di
, objfile
);
2693 add_enum_psymbol (&di
, objfile
);
2705 scan_compilation_units -- build a psymtab entry for each compilation
2709 This is the top level dwarf parsing routine for building partial
2712 It scans from the beginning of the DWARF table looking for the first
2713 TAG_compile_unit DIE, and then follows the sibling chain to locate
2714 each additional TAG_compile_unit DIE.
2716 For each TAG_compile_unit DIE it creates a partial symtab structure,
2717 calls a subordinate routine to collect all the compilation unit's
2718 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2719 new partial symtab structure into the partial symbol table. It also
2720 records the appropriate information in the partial symbol table entry
2721 to allow the chunk of DIE's and line number table for this compilation
2722 unit to be located and re-read later, to generate a complete symbol
2723 table entry for the compilation unit.
2725 Thus it effectively partitions up a chunk of DIE's for multiple
2726 compilation units into smaller DIE chunks and line number tables,
2727 and associates them with a partial symbol table entry.
2731 If any compilation unit has no line number table associated with
2732 it for some reason (a missing at_stmt_list attribute, rather than
2733 just one with a value of zero, which is valid) then we ensure that
2734 the recorded file offset is zero so that the routine which later
2735 reads line number table fragments knows that there is no fragment
2745 scan_compilation_units (thisdie
, enddie
, dbfoff
, lnoffset
, objfile
)
2750 struct objfile
*objfile
;
2754 struct partial_symtab
*pst
;
2757 file_ptr curlnoffset
;
2759 while (thisdie
< enddie
)
2761 basicdieinfo (&di
, thisdie
, objfile
);
2762 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2766 else if (di
.die_tag
!= TAG_compile_unit
)
2768 nextdie
= thisdie
+ di
.die_length
;
2772 completedieinfo (&di
, objfile
);
2773 set_cu_language (&di
);
2774 if (di
.at_sibling
!= 0)
2776 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2780 nextdie
= thisdie
+ di
.die_length
;
2782 curoff
= thisdie
- dbbase
;
2783 culength
= nextdie
- thisdie
;
2784 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2786 /* First allocate a new partial symbol table structure */
2788 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2789 di
.at_name
, di
.at_low_pc
,
2790 objfile
-> global_psymbols
.next
,
2791 objfile
-> static_psymbols
.next
);
2793 pst
-> texthigh
= di
.at_high_pc
;
2794 pst
-> read_symtab_private
= (char *)
2795 obstack_alloc (&objfile
-> psymbol_obstack
,
2796 sizeof (struct dwfinfo
));
2797 DBFOFF (pst
) = dbfoff
;
2798 DBROFF (pst
) = curoff
;
2799 DBLENGTH (pst
) = culength
;
2800 LNFOFF (pst
) = curlnoffset
;
2801 pst
-> read_symtab
= dwarf_psymtab_to_symtab
;
2803 /* Now look for partial symbols */
2805 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2807 pst
-> n_global_syms
= objfile
-> global_psymbols
.next
-
2808 (objfile
-> global_psymbols
.list
+ pst
-> globals_offset
);
2809 pst
-> n_static_syms
= objfile
-> static_psymbols
.next
-
2810 (objfile
-> static_psymbols
.list
+ pst
-> statics_offset
);
2811 sort_pst_symbols (pst
);
2812 /* If there is already a psymtab or symtab for a file of this name,
2813 remove it. (If there is a symtab, more drastic things also
2814 happen.) This happens in VxWorks. */
2815 free_named_symtabs (pst
-> filename
);
2825 new_symbol -- make a symbol table entry for a new symbol
2829 static struct symbol *new_symbol (struct dieinfo *dip,
2830 struct objfile *objfile)
2834 Given a pointer to a DWARF information entry, figure out if we need
2835 to make a symbol table entry for it, and if so, create a new entry
2836 and return a pointer to it.
2839 static struct symbol
*
2840 new_symbol (dip
, objfile
)
2841 struct dieinfo
*dip
;
2842 struct objfile
*objfile
;
2844 struct symbol
*sym
= NULL
;
2846 if (dip
-> at_name
!= NULL
)
2848 sym
= (struct symbol
*) obstack_alloc (&objfile
-> symbol_obstack
,
2849 sizeof (struct symbol
));
2850 memset (sym
, 0, sizeof (struct symbol
));
2851 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2852 &objfile
->symbol_obstack
);
2853 /* default assumptions */
2854 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2855 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2856 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2857 switch (dip
-> die_tag
)
2860 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2861 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2863 case TAG_global_subroutine
:
2864 case TAG_subroutine
:
2865 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2866 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2867 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2868 if (dip
-> die_tag
== TAG_global_subroutine
)
2870 add_symbol_to_list (sym
, &global_symbols
);
2874 add_symbol_to_list (sym
, list_in_scope
);
2877 case TAG_global_variable
:
2878 if (dip
-> at_location
!= NULL
)
2880 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2881 add_symbol_to_list (sym
, &global_symbols
);
2882 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2883 SYMBOL_VALUE (sym
) += baseaddr
;
2886 case TAG_local_variable
:
2887 if (dip
-> at_location
!= NULL
)
2889 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2890 add_symbol_to_list (sym
, list_in_scope
);
2893 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2897 SYMBOL_CLASS (sym
) = LOC_LOCAL
;
2901 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2902 SYMBOL_VALUE (sym
) += baseaddr
;
2906 case TAG_formal_parameter
:
2907 if (dip
-> at_location
!= NULL
)
2909 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2911 add_symbol_to_list (sym
, list_in_scope
);
2914 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
2918 SYMBOL_CLASS (sym
) = LOC_ARG
;
2921 case TAG_unspecified_parameters
:
2922 /* From varargs functions; gdb doesn't seem to have any interest in
2923 this information, so just ignore it for now. (FIXME?) */
2925 case TAG_class_type
:
2926 case TAG_structure_type
:
2927 case TAG_union_type
:
2928 case TAG_enumeration_type
:
2929 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2930 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
2931 add_symbol_to_list (sym
, list_in_scope
);
2934 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2935 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2936 add_symbol_to_list (sym
, list_in_scope
);
2939 /* Not a tag we recognize. Hopefully we aren't processing trash
2940 data, but since we must specifically ignore things we don't
2941 recognize, there is nothing else we should do at this point. */
2952 synthesize_typedef -- make a symbol table entry for a "fake" typedef
2956 static void synthesize_typedef (struct dieinfo *dip,
2957 struct objfile *objfile,
2962 Given a pointer to a DWARF information entry, synthesize a typedef
2963 for the name in the DIE, using the specified type.
2965 This is used for C++ class, structs, unions, and enumerations to
2966 set up the tag name as a type.
2971 synthesize_typedef (dip
, objfile
, type
)
2972 struct dieinfo
*dip
;
2973 struct objfile
*objfile
;
2976 struct symbol
*sym
= NULL
;
2978 if (dip
-> at_name
!= NULL
)
2980 sym
= (struct symbol
*)
2981 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symbol
));
2982 memset (sym
, 0, sizeof (struct symbol
));
2983 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2984 &objfile
->symbol_obstack
);
2985 SYMBOL_TYPE (sym
) = type
;
2986 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2987 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2988 add_symbol_to_list (sym
, list_in_scope
);
2996 decode_mod_fund_type -- decode a modified fundamental type
3000 static struct type *decode_mod_fund_type (char *typedata)
3004 Decode a block of data containing a modified fundamental
3005 type specification. TYPEDATA is a pointer to the block,
3006 which starts with a length containing the size of the rest
3007 of the block. At the end of the block is a fundmental type
3008 code value that gives the fundamental type. Everything
3009 in between are type modifiers.
3011 We simply compute the number of modifiers and call the general
3012 function decode_modified_type to do the actual work.
3015 static struct type
*
3016 decode_mod_fund_type (typedata
)
3019 struct type
*typep
= NULL
;
3020 unsigned short modcount
;
3023 /* Get the total size of the block, exclusive of the size itself */
3025 nbytes
= attribute_size (AT_mod_fund_type
);
3026 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3029 /* Deduct the size of the fundamental type bytes at the end of the block. */
3031 modcount
-= attribute_size (AT_fund_type
);
3033 /* Now do the actual decoding */
3035 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
3043 decode_mod_u_d_type -- decode a modified user defined type
3047 static struct type *decode_mod_u_d_type (char *typedata)
3051 Decode a block of data containing a modified user defined
3052 type specification. TYPEDATA is a pointer to the block,
3053 which consists of a two byte length, containing the size
3054 of the rest of the block. At the end of the block is a
3055 four byte value that gives a reference to a user defined type.
3056 Everything in between are type modifiers.
3058 We simply compute the number of modifiers and call the general
3059 function decode_modified_type to do the actual work.
3062 static struct type
*
3063 decode_mod_u_d_type (typedata
)
3066 struct type
*typep
= NULL
;
3067 unsigned short modcount
;
3070 /* Get the total size of the block, exclusive of the size itself */
3072 nbytes
= attribute_size (AT_mod_u_d_type
);
3073 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
3076 /* Deduct the size of the reference type bytes at the end of the block. */
3078 modcount
-= attribute_size (AT_user_def_type
);
3080 /* Now do the actual decoding */
3082 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
3090 decode_modified_type -- decode modified user or fundamental type
3094 static struct type *decode_modified_type (char *modifiers,
3095 unsigned short modcount, int mtype)
3099 Decode a modified type, either a modified fundamental type or
3100 a modified user defined type. MODIFIERS is a pointer to the
3101 block of bytes that define MODCOUNT modifiers. Immediately
3102 following the last modifier is a short containing the fundamental
3103 type or a long containing the reference to the user defined
3104 type. Which one is determined by MTYPE, which is either
3105 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3106 type we are generating.
3108 We call ourself recursively to generate each modified type,`
3109 until MODCOUNT reaches zero, at which point we have consumed
3110 all the modifiers and generate either the fundamental type or
3111 user defined type. When the recursion unwinds, each modifier
3112 is applied in turn to generate the full modified type.
3116 If we find a modifier that we don't recognize, and it is not one
3117 of those reserved for application specific use, then we issue a
3118 warning and simply ignore the modifier.
3122 We currently ignore MOD_const and MOD_volatile. (FIXME)
3126 static struct type
*
3127 decode_modified_type (modifiers
, modcount
, mtype
)
3129 unsigned int modcount
;
3132 struct type
*typep
= NULL
;
3133 unsigned short fundtype
;
3142 case AT_mod_fund_type
:
3143 nbytes
= attribute_size (AT_fund_type
);
3144 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3146 typep
= decode_fund_type (fundtype
);
3148 case AT_mod_u_d_type
:
3149 nbytes
= attribute_size (AT_user_def_type
);
3150 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3152 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3154 typep
= alloc_utype (die_ref
, NULL
);
3158 SQUAWK (("botched modified type decoding (mtype 0x%x)", mtype
));
3159 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3165 modifier
= *modifiers
++;
3166 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3169 case MOD_pointer_to
:
3170 typep
= lookup_pointer_type (typep
);
3172 case MOD_reference_to
:
3173 typep
= lookup_reference_type (typep
);
3176 SQUAWK (("type modifier 'const' ignored")); /* FIXME */
3179 SQUAWK (("type modifier 'volatile' ignored")); /* FIXME */
3182 if (!(MOD_lo_user
<= (unsigned char) modifier
3183 && (unsigned char) modifier
<= MOD_hi_user
))
3185 SQUAWK (("unknown type modifier %u",
3186 (unsigned char) modifier
));
3198 decode_fund_type -- translate basic DWARF type to gdb base type
3202 Given an integer that is one of the fundamental DWARF types,
3203 translate it to one of the basic internal gdb types and return
3204 a pointer to the appropriate gdb type (a "struct type *").
3208 If we encounter a fundamental type that we are unprepared to
3209 deal with, and it is not in the range of those types defined
3210 as application specific types, then we issue a warning and
3211 treat the type as an "int".
3214 static struct type
*
3215 decode_fund_type (fundtype
)
3216 unsigned int fundtype
;
3218 struct type
*typep
= NULL
;
3224 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3227 case FT_boolean
: /* Was FT_set in AT&T version */
3228 typep
= dwarf_fundamental_type (current_objfile
, FT_BOOLEAN
);
3231 case FT_pointer
: /* (void *) */
3232 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3233 typep
= lookup_pointer_type (typep
);
3237 typep
= dwarf_fundamental_type (current_objfile
, FT_CHAR
);
3240 case FT_signed_char
:
3241 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3244 case FT_unsigned_char
:
3245 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3249 typep
= dwarf_fundamental_type (current_objfile
, FT_SHORT
);
3252 case FT_signed_short
:
3253 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3256 case FT_unsigned_short
:
3257 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3261 typep
= dwarf_fundamental_type (current_objfile
, FT_INTEGER
);
3264 case FT_signed_integer
:
3265 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3268 case FT_unsigned_integer
:
3269 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3273 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG
);
3276 case FT_signed_long
:
3277 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3280 case FT_unsigned_long
:
3281 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3285 typep
= dwarf_fundamental_type (current_objfile
, FT_LONG_LONG
);
3288 case FT_signed_long_long
:
3289 typep
= dwarf_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3292 case FT_unsigned_long_long
:
3293 typep
= dwarf_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3297 typep
= dwarf_fundamental_type (current_objfile
, FT_FLOAT
);
3300 case FT_dbl_prec_float
:
3301 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3304 case FT_ext_prec_float
:
3305 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3309 typep
= dwarf_fundamental_type (current_objfile
, FT_COMPLEX
);
3312 case FT_dbl_prec_complex
:
3313 typep
= dwarf_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3316 case FT_ext_prec_complex
:
3317 typep
= dwarf_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3322 if ((typep
== NULL
) && !(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3324 SQUAWK (("unexpected fundamental type 0x%x", fundtype
));
3325 typep
= dwarf_fundamental_type (current_objfile
, FT_VOID
);
3335 create_name -- allocate a fresh copy of a string on an obstack
3339 Given a pointer to a string and a pointer to an obstack, allocates
3340 a fresh copy of the string on the specified obstack.
3345 create_name (name
, obstackp
)
3347 struct obstack
*obstackp
;
3352 length
= strlen (name
) + 1;
3353 newname
= (char *) obstack_alloc (obstackp
, length
);
3354 strcpy (newname
, name
);
3362 basicdieinfo -- extract the minimal die info from raw die data
3366 void basicdieinfo (char *diep, struct dieinfo *dip,
3367 struct objfile *objfile)
3371 Given a pointer to raw DIE data, and a pointer to an instance of a
3372 die info structure, this function extracts the basic information
3373 from the DIE data required to continue processing this DIE, along
3374 with some bookkeeping information about the DIE.
3376 The information we absolutely must have includes the DIE tag,
3377 and the DIE length. If we need the sibling reference, then we
3378 will have to call completedieinfo() to process all the remaining
3381 Note that since there is no guarantee that the data is properly
3382 aligned in memory for the type of access required (indirection
3383 through anything other than a char pointer), and there is no
3384 guarantee that it is in the same byte order as the gdb host,
3385 we call a function which deals with both alignment and byte
3386 swapping issues. Possibly inefficient, but quite portable.
3388 We also take care of some other basic things at this point, such
3389 as ensuring that the instance of the die info structure starts
3390 out completely zero'd and that curdie is initialized for use
3391 in error reporting if we have a problem with the current die.
3395 All DIE's must have at least a valid length, thus the minimum
3396 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3397 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3398 are forced to be TAG_padding DIES.
3400 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3401 that if a padding DIE is used for alignment and the amount needed is
3402 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3403 enough to align to the next alignment boundry.
3405 We do some basic sanity checking here, such as verifying that the
3406 length of the die would not cause it to overrun the recorded end of
3407 the buffer holding the DIE info. If we find a DIE that is either
3408 too small or too large, we force it's length to zero which should
3409 cause the caller to take appropriate action.
3413 basicdieinfo (dip
, diep
, objfile
)
3414 struct dieinfo
*dip
;
3416 struct objfile
*objfile
;
3419 memset (dip
, 0, sizeof (struct dieinfo
));
3421 dip
-> die_ref
= dbroff
+ (diep
- dbbase
);
3422 dip
-> die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3424 if ((dip
-> die_length
< SIZEOF_DIE_LENGTH
) ||
3425 ((diep
+ dip
-> die_length
) > (dbbase
+ dbsize
)))
3427 dwarfwarn ("malformed DIE, bad length (%d bytes)", dip
-> die_length
);
3428 dip
-> die_length
= 0;
3430 else if (dip
-> die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3432 dip
-> die_tag
= TAG_padding
;
3436 diep
+= SIZEOF_DIE_LENGTH
;
3437 dip
-> die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3446 completedieinfo -- finish reading the information for a given DIE
3450 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3454 Given a pointer to an already partially initialized die info structure,
3455 scan the raw DIE data and finish filling in the die info structure
3456 from the various attributes found.
3458 Note that since there is no guarantee that the data is properly
3459 aligned in memory for the type of access required (indirection
3460 through anything other than a char pointer), and there is no
3461 guarantee that it is in the same byte order as the gdb host,
3462 we call a function which deals with both alignment and byte
3463 swapping issues. Possibly inefficient, but quite portable.
3467 Each time we are called, we increment the diecount variable, which
3468 keeps an approximate count of the number of dies processed for
3469 each compilation unit. This information is presented to the user
3470 if the info_verbose flag is set.
3475 completedieinfo (dip
, objfile
)
3476 struct dieinfo
*dip
;
3477 struct objfile
*objfile
;
3479 char *diep
; /* Current pointer into raw DIE data */
3480 char *end
; /* Terminate DIE scan here */
3481 unsigned short attr
; /* Current attribute being scanned */
3482 unsigned short form
; /* Form of the attribute */
3483 int nbytes
; /* Size of next field to read */
3487 end
= diep
+ dip
-> die_length
;
3488 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3491 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3492 diep
+= SIZEOF_ATTRIBUTE
;
3493 if ((nbytes
= attribute_size (attr
)) == -1)
3495 SQUAWK (("unknown attribute length, skipped remaining attributes"));;
3502 dip
-> at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3506 dip
-> at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3510 dip
-> at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3514 dip
-> at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3518 dip
-> at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3520 dip
-> has_at_stmt_list
= 1;
3523 dip
-> at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3525 dip
-> at_low_pc
+= baseaddr
;
3526 dip
-> has_at_low_pc
= 1;
3529 dip
-> at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3531 dip
-> at_high_pc
+= baseaddr
;
3534 dip
-> at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3537 case AT_user_def_type
:
3538 dip
-> at_user_def_type
= target_to_host (diep
, nbytes
,
3539 GET_UNSIGNED
, objfile
);
3542 dip
-> at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3544 dip
-> has_at_byte_size
= 1;
3547 dip
-> at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3551 dip
-> at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3555 dip
-> at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3559 dip
-> at_location
= diep
;
3561 case AT_mod_fund_type
:
3562 dip
-> at_mod_fund_type
= diep
;
3564 case AT_subscr_data
:
3565 dip
-> at_subscr_data
= diep
;
3567 case AT_mod_u_d_type
:
3568 dip
-> at_mod_u_d_type
= diep
;
3570 case AT_element_list
:
3571 dip
-> at_element_list
= diep
;
3572 dip
-> short_element_list
= 0;
3574 case AT_short_element_list
:
3575 dip
-> at_element_list
= diep
;
3576 dip
-> short_element_list
= 1;
3578 case AT_discr_value
:
3579 dip
-> at_discr_value
= diep
;
3581 case AT_string_length
:
3582 dip
-> at_string_length
= diep
;
3585 dip
-> at_name
= diep
;
3588 /* For now, ignore any "hostname:" portion, since gdb doesn't
3589 know how to deal with it. (FIXME). */
3590 dip
-> at_comp_dir
= strrchr (diep
, ':');
3591 if (dip
-> at_comp_dir
!= NULL
)
3593 dip
-> at_comp_dir
++;
3597 dip
-> at_comp_dir
= diep
;
3601 dip
-> at_producer
= diep
;
3603 case AT_start_scope
:
3604 dip
-> at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3607 case AT_stride_size
:
3608 dip
-> at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3612 dip
-> at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3616 dip
-> at_prototyped
= diep
;
3619 /* Found an attribute that we are unprepared to handle. However
3620 it is specifically one of the design goals of DWARF that
3621 consumers should ignore unknown attributes. As long as the
3622 form is one that we recognize (so we know how to skip it),
3623 we can just ignore the unknown attribute. */
3626 form
= FORM_FROM_ATTR (attr
);
3640 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3643 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3646 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3649 diep
+= strlen (diep
) + 1;
3652 SQUAWK (("unknown attribute form (0x%x)", form
));
3653 SQUAWK (("unknown attribute length, skipped remaining attributes"));;
3664 target_to_host -- swap in target data to host
3668 target_to_host (char *from, int nbytes, int signextend,
3669 struct objfile *objfile)
3673 Given pointer to data in target format in FROM, a byte count for
3674 the size of the data in NBYTES, a flag indicating whether or not
3675 the data is signed in SIGNEXTEND, and a pointer to the current
3676 objfile in OBJFILE, convert the data to host format and return
3677 the converted value.
3681 FIXME: If we read data that is known to be signed, and expect to
3682 use it as signed data, then we need to explicitly sign extend the
3683 result until the bfd library is able to do this for us.
3687 static unsigned long
3688 target_to_host (from
, nbytes
, signextend
, objfile
)
3691 int signextend
; /* FIXME: Unused */
3692 struct objfile
*objfile
;
3694 unsigned long rtnval
;
3699 rtnval
= bfd_get_64 (objfile
-> obfd
, (bfd_byte
*) from
);
3702 rtnval
= bfd_get_32 (objfile
-> obfd
, (bfd_byte
*) from
);
3705 rtnval
= bfd_get_16 (objfile
-> obfd
, (bfd_byte
*) from
);
3708 rtnval
= bfd_get_8 (objfile
-> obfd
, (bfd_byte
*) from
);
3711 dwarfwarn ("no bfd support for %d byte data object", nbytes
);
3722 attribute_size -- compute size of data for a DWARF attribute
3726 static int attribute_size (unsigned int attr)
3730 Given a DWARF attribute in ATTR, compute the size of the first
3731 piece of data associated with this attribute and return that
3734 Returns -1 for unrecognized attributes.
3739 attribute_size (attr
)
3742 int nbytes
; /* Size of next data for this attribute */
3743 unsigned short form
; /* Form of the attribute */
3745 form
= FORM_FROM_ATTR (attr
);
3748 case FORM_STRING
: /* A variable length field is next */
3751 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3752 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3755 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3756 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3757 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3760 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3763 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3764 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3767 SQUAWK (("unknown attribute form (0x%x)", form
));