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"
61 /* FIXME -- convert this to SEEK_SET a la POSIX, move to config files. */
66 #ifdef MAINTENANCE /* Define to 1 to compile in some maintenance stuff */
67 #define SQUAWK(stuff) dwarfwarn stuff
72 #ifndef R_FP /* FIXME */
73 #define R_FP 14 /* Kludge to get frame pointer register number */
76 typedef unsigned int DIE_REF
; /* Reference to a DIE */
79 #define GCC_PRODUCER "GNU C "
82 #ifndef GPLUS_PRODUCER
83 #define GPLUS_PRODUCER "GNU C++ "
87 #define LCC_PRODUCER "NCR C/C++"
90 #ifndef CFRONT_PRODUCER
91 #define CFRONT_PRODUCER "CFRONT " /* A wild a** guess... */
94 #define STREQ(a,b) (strcmp(a,b)==0)
95 #define STREQN(a,b,n) (strncmp(a,b,n)==0)
97 /* Flags to target_to_host() that tell whether or not the data object is
98 expected to be signed. Used, for example, when fetching a signed
99 integer in the target environment which is used as a signed integer
100 in the host environment, and the two environments have different sized
101 ints. In this case, *somebody* has to sign extend the smaller sized
104 #define GET_UNSIGNED 0 /* No sign extension required */
105 #define GET_SIGNED 1 /* Sign extension required */
107 /* Defines for things which are specified in the document "DWARF Debugging
108 Information Format" published by UNIX International, Programming Languages
109 SIG. These defines are based on revision 1.0.0, Jan 20, 1992. */
111 #define SIZEOF_DIE_LENGTH 4
112 #define SIZEOF_DIE_TAG 2
113 #define SIZEOF_ATTRIBUTE 2
114 #define SIZEOF_FORMAT_SPECIFIER 1
115 #define SIZEOF_FMT_FT 2
116 #define SIZEOF_LINETBL_LENGTH 4
117 #define SIZEOF_LINETBL_LINENO 4
118 #define SIZEOF_LINETBL_STMT 2
119 #define SIZEOF_LINETBL_DELTA 4
120 #define SIZEOF_LOC_ATOM_CODE 1
122 #define FORM_FROM_ATTR(attr) ((attr) & 0xF) /* Implicitly specified */
124 /* Macros that return the sizes of various types of data in the target
127 FIXME: Currently these are just compile time constants (as they are in
128 other parts of gdb as well). They need to be able to get the right size
129 either from the bfd or possibly from the DWARF info. It would be nice if
130 the DWARF producer inserted DIES that describe the fundamental types in
131 the target environment into the DWARF info, similar to the way dbx stabs
132 producers produce information about their fundamental types. */
134 #define TARGET_FT_POINTER_SIZE(objfile) (TARGET_PTR_BIT / TARGET_CHAR_BIT)
135 #define TARGET_FT_LONG_SIZE(objfile) (TARGET_LONG_BIT / TARGET_CHAR_BIT)
137 /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a
138 FORM_BLOCK2, and this is the value emitted by the AT&T compiler.
139 However, the Issue 2 DWARF specification from AT&T defines it as
140 a FORM_BLOCK4, as does the latest specification from UI/PLSIG.
141 For backwards compatibility with the AT&T compiler produced executables
142 we define AT_short_element_list for this variant. */
144 #define AT_short_element_list (0x00f0|FORM_BLOCK2)
146 /* External variables referenced. */
148 extern int info_verbose
; /* From main.c; nonzero => verbose */
149 extern char *warning_pre_print
; /* From utils.c */
151 /* The DWARF debugging information consists of two major pieces,
152 one is a block of DWARF Information Entries (DIE's) and the other
153 is a line number table. The "struct dieinfo" structure contains
154 the information for a single DIE, the one currently being processed.
156 In order to make it easier to randomly access the attribute fields
157 of the current DIE, which are specifically unordered within the DIE,
158 each DIE is scanned and an instance of the "struct dieinfo"
159 structure is initialized.
161 Initialization is done in two levels. The first, done by basicdieinfo(),
162 just initializes those fields that are vital to deciding whether or not
163 to use this DIE, how to skip past it, etc. The second, done by the
164 function completedieinfo(), fills in the rest of the information.
166 Attributes which have block forms are not interpreted at the time
167 the DIE is scanned, instead we just save pointers to the start
168 of their value fields.
170 Some fields have a flag <name>_p that is set when the value of the
171 field is valid (I.E. we found a matching attribute in the DIE). Since
172 we may want to test for the presence of some attributes in the DIE,
173 such as AT_low_pc, without restricting the values of the field,
174 we need someway to note that we found such an attribute.
181 char * die
; /* Pointer to the raw DIE data */
182 unsigned long die_length
; /* Length of the raw DIE data */
183 DIE_REF die_ref
; /* Offset of this DIE */
184 unsigned short die_tag
; /* Tag for this DIE */
185 unsigned long at_padding
;
186 unsigned long at_sibling
;
189 unsigned short at_fund_type
;
190 BLOCK
* at_mod_fund_type
;
191 unsigned long at_user_def_type
;
192 BLOCK
* at_mod_u_d_type
;
193 unsigned short at_ordering
;
194 BLOCK
* at_subscr_data
;
195 unsigned long at_byte_size
;
196 unsigned short at_bit_offset
;
197 unsigned long at_bit_size
;
198 BLOCK
* at_element_list
;
199 unsigned long at_stmt_list
;
200 unsigned long at_low_pc
;
201 unsigned long at_high_pc
;
202 unsigned long at_language
;
203 unsigned long at_member
;
204 unsigned long at_discr
;
205 BLOCK
* at_discr_value
;
206 BLOCK
* at_string_length
;
209 unsigned long at_start_scope
;
210 unsigned long at_stride_size
;
211 unsigned long at_src_info
;
212 char * at_prototyped
;
213 unsigned int has_at_low_pc
:1;
214 unsigned int has_at_stmt_list
:1;
215 unsigned int has_at_byte_size
:1;
216 unsigned int short_element_list
:1;
219 static int diecount
; /* Approximate count of dies for compilation unit */
220 static struct dieinfo
*curdie
; /* For warnings and such */
222 static char *dbbase
; /* Base pointer to dwarf info */
223 static int dbsize
; /* Size of dwarf info in bytes */
224 static int dbroff
; /* Relative offset from start of .debug section */
225 static char *lnbase
; /* Base pointer to line section */
226 static int isreg
; /* Kludge to identify register variables */
227 static int offreg
; /* Kludge to identify basereg references */
229 /* This value is added to each symbol value. FIXME: Generalize to
230 the section_offsets structure used by dbxread. */
231 static CORE_ADDR baseaddr
; /* Add to each symbol value */
233 /* The section offsets used in the current psymtab or symtab. FIXME,
234 only used to pass one value (baseaddr) at the moment. */
235 static struct section_offsets
*base_section_offsets
;
237 /* Each partial symbol table entry contains a pointer to private data for the
238 read_symtab() function to use when expanding a partial symbol table entry
239 to a full symbol table entry. For DWARF debugging info, this data is
240 contained in the following structure and macros are provided for easy
241 access to the members given a pointer to a partial symbol table entry.
243 dbfoff Always the absolute file offset to the start of the ".debug"
244 section for the file containing the DIE's being accessed.
246 dbroff Relative offset from the start of the ".debug" access to the
247 first DIE to be accessed. When building the partial symbol
248 table, this value will be zero since we are accessing the
249 entire ".debug" section. When expanding a partial symbol
250 table entry, this value will be the offset to the first
251 DIE for the compilation unit containing the symbol that
252 triggers the expansion.
254 dblength The size of the chunk of DIE's being examined, in bytes.
256 lnfoff The absolute file offset to the line table fragment. Ignored
257 when building partial symbol tables, but used when expanding
258 them, and contains the absolute file offset to the fragment
259 of the ".line" section containing the line numbers for the
260 current compilation unit.
264 file_ptr dbfoff
; /* Absolute file offset to start of .debug section */
265 int dbroff
; /* Relative offset from start of .debug section */
266 int dblength
; /* Size of the chunk of DIE's being examined */
267 file_ptr lnfoff
; /* Absolute file offset to line table fragment */
270 #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
271 #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
272 #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
273 #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
275 /* The generic symbol table building routines have separate lists for
276 file scope symbols and all all other scopes (local scopes). So
277 we need to select the right one to pass to add_symbol_to_list().
278 We do it by keeping a pointer to the correct list in list_in_scope.
280 FIXME: The original dwarf code just treated the file scope as the first
281 local scope, and all other local scopes as nested local scopes, and worked
282 fine. Check to see if we really need to distinguish these in buildsym.c */
284 struct pending
**list_in_scope
= &file_symbols
;
286 /* DIES which have user defined types or modified user defined types refer to
287 other DIES for the type information. Thus we need to associate the offset
288 of a DIE for a user defined type with a pointer to the type information.
290 Originally this was done using a simple but expensive algorithm, with an
291 array of unsorted structures, each containing an offset/type-pointer pair.
292 This array was scanned linearly each time a lookup was done. The result
293 was that gdb was spending over half it's startup time munging through this
294 array of pointers looking for a structure that had the right offset member.
296 The second attempt used the same array of structures, but the array was
297 sorted using qsort each time a new offset/type was recorded, and a binary
298 search was used to find the type pointer for a given DIE offset. This was
299 even slower, due to the overhead of sorting the array each time a new
300 offset/type pair was entered.
302 The third attempt uses a fixed size array of type pointers, indexed by a
303 value derived from the DIE offset. Since the minimum DIE size is 4 bytes,
304 we can divide any DIE offset by 4 to obtain a unique index into this fixed
305 size array. Since each element is a 4 byte pointer, it takes exactly as
306 much memory to hold this array as to hold the DWARF info for a given
307 compilation unit. But it gets freed as soon as we are done with it. */
309 static struct type
**utypes
; /* Pointer to array of user type pointers */
310 static int numutypes
; /* Max number of user type pointers */
312 /* Record the language for the compilation unit which is currently being
313 processed. We know it once we have seen the TAG_compile_unit DIE,
314 and we need it while processing the DIE's for that compilation unit.
315 It is eventually saved in the symtab structure, but we don't finalize
316 the symtab struct until we have processed all the DIE's for the
319 static enum language cu_language
;
321 /* Forward declarations of static functions so we don't have to worry
322 about ordering within this file. */
325 attribute_size
PARAMS ((unsigned int));
328 target_to_host
PARAMS ((char *, int, int, struct objfile
*));
331 add_enum_psymbol
PARAMS ((struct dieinfo
*, struct objfile
*));
334 handle_producer
PARAMS ((char *));
337 read_file_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
340 read_func_scope
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
343 read_lexical_block_scope
PARAMS ((struct dieinfo
*, char *, char *,
350 scan_partial_symbols
PARAMS ((char *, char *, struct objfile
*));
353 scan_compilation_units
PARAMS ((char *, char *, file_ptr
,
354 file_ptr
, struct objfile
*));
357 add_partial_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
360 init_psymbol_list
PARAMS ((struct objfile
*, int));
363 basicdieinfo
PARAMS ((struct dieinfo
*, char *, struct objfile
*));
366 completedieinfo
PARAMS ((struct dieinfo
*, struct objfile
*));
369 dwarf_psymtab_to_symtab
PARAMS ((struct partial_symtab
*));
372 psymtab_to_symtab_1
PARAMS ((struct partial_symtab
*));
374 static struct symtab
*
375 read_ofile_symtab
PARAMS ((struct partial_symtab
*));
378 process_dies
PARAMS ((char *, char *, struct objfile
*));
381 read_structure_scope
PARAMS ((struct dieinfo
*, char *, char *,
385 decode_array_element_type
PARAMS ((char *));
388 decode_subscr_data
PARAMS ((char *, char *));
391 dwarf_read_array_type
PARAMS ((struct dieinfo
*));
394 read_tag_pointer_type
PARAMS ((struct dieinfo
*dip
));
397 read_subroutine_type
PARAMS ((struct dieinfo
*, char *, char *));
400 read_enumeration
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
403 struct_type
PARAMS ((struct dieinfo
*, char *, char *, struct objfile
*));
406 enum_type
PARAMS ((struct dieinfo
*, struct objfile
*));
409 decode_line_numbers
PARAMS ((char *));
412 decode_die_type
PARAMS ((struct dieinfo
*));
415 decode_mod_fund_type
PARAMS ((char *));
418 decode_mod_u_d_type
PARAMS ((char *));
421 decode_modified_type
PARAMS ((char *, unsigned int, int));
424 decode_fund_type
PARAMS ((unsigned int));
427 create_name
PARAMS ((char *, struct obstack
*));
430 lookup_utype
PARAMS ((DIE_REF
));
433 alloc_utype
PARAMS ((DIE_REF
, struct type
*));
435 static struct symbol
*
436 new_symbol
PARAMS ((struct dieinfo
*, struct objfile
*));
439 synthesize_typedef
PARAMS ((struct dieinfo
*, struct objfile
*,
443 locval
PARAMS ((char *));
446 record_minimal_symbol
PARAMS ((char *, CORE_ADDR
, enum minimal_symbol_type
,
450 set_cu_language
PARAMS ((struct dieinfo
*));
456 set_cu_language -- set local copy of language for compilation unit
461 set_cu_language (struct dieinfo *dip)
465 Decode the language attribute for a compilation unit DIE and
466 remember what the language was. We use this at various times
467 when processing DIE's for a given compilation unit.
476 set_cu_language (dip
)
479 switch (dip
-> at_language
)
483 cu_language
= language_c
;
485 case LANG_C_PLUS_PLUS
:
486 cu_language
= language_cplus
;
496 cu_language
= language_unknown
;
505 dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
509 void dwarf_build_psymtabs (struct objfile *objfile,
510 struct section_offsets *section_offsets,
511 int mainline, file_ptr dbfoff, unsigned int dbfsize,
512 file_ptr lnoffset, unsigned int lnsize)
516 This function is called upon to build partial symtabs from files
517 containing DIE's (Dwarf Information Entries) and DWARF line numbers.
519 It is passed a bfd* containing the DIES
520 and line number information, the corresponding filename for that
521 file, a base address for relocating the symbols, a flag indicating
522 whether or not this debugging information is from a "main symbol
523 table" rather than a shared library or dynamically linked file,
524 and file offset/size pairs for the DIE information and line number
534 dwarf_build_psymtabs (objfile
, section_offsets
, mainline
, dbfoff
, dbfsize
,
536 struct objfile
*objfile
;
537 struct section_offsets
*section_offsets
;
540 unsigned int dbfsize
;
544 bfd
*abfd
= objfile
->obfd
;
545 struct cleanup
*back_to
;
547 current_objfile
= objfile
;
549 dbbase
= xmalloc (dbsize
);
551 if ((bfd_seek (abfd
, dbfoff
, L_SET
) != 0) ||
552 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
555 error ("can't read DWARF data from '%s'", bfd_get_filename (abfd
));
557 back_to
= make_cleanup (free
, dbbase
);
559 /* If we are reinitializing, or if we have never loaded syms yet, init.
560 Since we have no idea how many DIES we are looking at, we just guess
561 some arbitrary value. */
563 if (mainline
|| objfile
-> global_psymbols
.size
== 0 ||
564 objfile
-> static_psymbols
.size
== 0)
566 init_psymbol_list (objfile
, 1024);
569 /* Save the relocation factor where everybody can see it. */
571 base_section_offsets
= section_offsets
;
572 baseaddr
= ANOFFSET (section_offsets
, 0);
574 /* Follow the compilation unit sibling chain, building a partial symbol
575 table entry for each one. Save enough information about each compilation
576 unit to locate the full DWARF information later. */
578 scan_compilation_units (dbbase
, dbbase
+ dbsize
, dbfoff
, lnoffset
, objfile
);
580 do_cleanups (back_to
);
581 current_objfile
= NULL
;
589 record_minimal_symbol -- add entry to gdb's minimal symbol table
593 static void record_minimal_symbol (char *name, CORE_ADDR address,
594 enum minimal_symbol_type ms_type,
595 struct objfile *objfile)
599 Given a pointer to the name of a symbol that should be added to the
600 minimal symbol table, and the address associated with that
601 symbol, records this information for later use in building the
602 minimal symbol table.
607 record_minimal_symbol (name
, address
, ms_type
, objfile
)
610 enum minimal_symbol_type ms_type
;
611 struct objfile
*objfile
;
613 name
= obsavestring (name
, strlen (name
), &objfile
-> symbol_obstack
);
614 prim_record_minimal_symbol (name
, address
, ms_type
);
621 dwarfwarn -- issue a DWARF related warning
625 Issue warnings about DWARF related things that aren't serious enough
626 to warrant aborting with an error, but should not be ignored either.
627 This includes things like detectable corruption in DIE's, missing
628 DIE's, unimplemented features, etc.
630 In general, running across tags or attributes that we don't recognize
631 is not considered to be a problem and we should not issue warnings
636 We mostly follow the example of the error() routine, but without
637 returning to command level. It is arguable about whether warnings
638 should be issued at all, and if so, where they should go (stdout or
641 We assume that curdie is valid and contains at least the basic
642 information for the DIE where the problem was noticed.
653 fmt
= va_arg (ap
, char *);
655 fprintf (stderr
, "warning: DWARF ref 0x%x: ", curdie
-> die_ref
);
656 if (curdie
-> at_name
)
658 fprintf (stderr
, "'%s': ", curdie
-> at_name
);
660 vfprintf (stderr
, fmt
, ap
);
661 fprintf (stderr
, "\n");
670 read_lexical_block_scope -- process all dies in a lexical block
674 static void read_lexical_block_scope (struct dieinfo *dip,
675 char *thisdie, char *enddie)
679 Process all the DIES contained within a lexical block scope.
680 Start a new scope, process the dies, and then close the scope.
685 read_lexical_block_scope (dip
, thisdie
, enddie
, objfile
)
689 struct objfile
*objfile
;
691 register struct context_stack
*new;
693 push_context (0, dip
-> at_low_pc
);
694 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
695 new = pop_context ();
696 if (local_symbols
!= NULL
)
698 finish_block (0, &local_symbols
, new -> old_blocks
, new -> start_addr
,
699 dip
-> at_high_pc
, objfile
);
701 local_symbols
= new -> locals
;
708 lookup_utype -- look up a user defined type from die reference
712 static type *lookup_utype (DIE_REF die_ref)
716 Given a DIE reference, lookup the user defined type associated with
717 that DIE, if it has been registered already. If not registered, then
718 return NULL. Alloc_utype() can be called to register an empty
719 type for this reference, which will be filled in later when the
720 actual referenced DIE is processed.
724 lookup_utype (die_ref
)
727 struct type
*type
= NULL
;
730 utypeidx
= (die_ref
- dbroff
) / 4;
731 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
733 dwarfwarn ("reference to DIE (0x%x) outside compilation unit", die_ref
);
737 type
= *(utypes
+ utypeidx
);
747 alloc_utype -- add a user defined type for die reference
751 static type *alloc_utype (DIE_REF die_ref, struct type *utypep)
755 Given a die reference DIE_REF, and a possible pointer to a user
756 defined type UTYPEP, register that this reference has a user
757 defined type and either use the specified type in UTYPEP or
758 make a new empty type that will be filled in later.
760 We should only be called after calling lookup_utype() to verify that
761 there is not currently a type registered for DIE_REF.
765 alloc_utype (die_ref
, utypep
)
772 utypeidx
= (die_ref
- dbroff
) / 4;
773 typep
= utypes
+ utypeidx
;
774 if ((utypeidx
< 0) || (utypeidx
>= numutypes
))
776 utypep
= lookup_fundamental_type (current_objfile
, FT_INTEGER
);
777 dwarfwarn ("reference to DIE (0x%x) outside compilation unit", die_ref
);
779 else if (*typep
!= NULL
)
782 SQUAWK (("internal error: dup user type allocation"));
788 utypep
= alloc_type (current_objfile
);
799 decode_die_type -- return a type for a specified die
803 static struct type *decode_die_type (struct dieinfo *dip)
807 Given a pointer to a die information structure DIP, decode the
808 type of the die and return a pointer to the decoded type. All
809 dies without specific types default to type int.
813 decode_die_type (dip
)
816 struct type
*type
= NULL
;
818 if (dip
-> at_fund_type
!= 0)
820 type
= decode_fund_type (dip
-> at_fund_type
);
822 else if (dip
-> at_mod_fund_type
!= NULL
)
824 type
= decode_mod_fund_type (dip
-> at_mod_fund_type
);
826 else if (dip
-> at_user_def_type
)
828 if ((type
= lookup_utype (dip
-> at_user_def_type
)) == NULL
)
830 type
= alloc_utype (dip
-> at_user_def_type
, NULL
);
833 else if (dip
-> at_mod_u_d_type
)
835 type
= decode_mod_u_d_type (dip
-> at_mod_u_d_type
);
839 type
= lookup_fundamental_type (current_objfile
, FT_INTEGER
);
848 struct_type -- compute and return the type for a struct or union
852 static struct type *struct_type (struct dieinfo *dip, char *thisdie,
853 char *enddie, struct objfile *objfile)
857 Given pointer to a die information structure for a die which
858 defines a union or structure (and MUST define one or the other),
859 and pointers to the raw die data that define the range of dies which
860 define the members, compute and return the user defined type for the
865 struct_type (dip
, thisdie
, enddie
, objfile
)
869 struct objfile
*objfile
;
873 struct nextfield
*next
;
876 struct nextfield
*list
= NULL
;
877 struct nextfield
*new;
885 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
887 /* No forward references created an empty type, so install one now */
888 type
= alloc_utype (dip
-> die_ref
, NULL
);
890 INIT_CPLUS_SPECIFIC(type
);
891 switch (dip
-> die_tag
)
894 TYPE_CODE (type
) = TYPE_CODE_CLASS
;
897 case TAG_structure_type
:
898 TYPE_CODE (type
) = TYPE_CODE_STRUCT
;
902 TYPE_CODE (type
) = TYPE_CODE_UNION
;
906 /* Should never happen */
907 TYPE_CODE (type
) = TYPE_CODE_UNDEF
;
909 SQUAWK (("missing class, structure, or union tag"));
912 /* Some compilers try to be helpful by inventing "fake" names for
913 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
914 Thanks, but no thanks... */
915 if (dip
-> at_name
!= NULL
916 && *dip
-> at_name
!= '~'
917 && *dip
-> at_name
!= '.')
919 TYPE_NAME (type
) = obconcat (&objfile
-> type_obstack
,
920 tpart1
, " ", dip
-> at_name
);
922 /* Use whatever size is known. Zero is a valid size. We might however
923 wish to check has_at_byte_size to make sure that some byte size was
924 given explicitly, but DWARF doesn't specify that explicit sizes of
925 zero have to present, so complaining about missing sizes should
926 probably not be the default. */
927 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
928 thisdie
+= dip
-> die_length
;
929 while (thisdie
< enddie
)
931 basicdieinfo (&mbr
, thisdie
, objfile
);
932 completedieinfo (&mbr
, objfile
);
933 if (mbr
.die_length
<= SIZEOF_DIE_LENGTH
)
937 else if (mbr
.at_sibling
!= 0)
939 nextdie
= dbbase
+ mbr
.at_sibling
- dbroff
;
943 nextdie
= thisdie
+ mbr
.die_length
;
948 /* Get space to record the next field's data. */
949 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
954 obsavestring (mbr
.at_name
, strlen (mbr
.at_name
),
955 &objfile
-> type_obstack
);
956 list
-> field
.type
= decode_die_type (&mbr
);
957 list
-> field
.bitpos
= 8 * locval (mbr
.at_location
);
958 /* Handle bit fields. */
959 list
-> field
.bitsize
= mbr
.at_bit_size
;
961 /* For big endian bits, the at_bit_offset gives the additional
962 bit offset from the MSB of the containing anonymous object to
963 the MSB of the field. We don't have to do anything special
964 since we don't need to know the size of the anonymous object. */
965 list
-> field
.bitpos
+= mbr
.at_bit_offset
;
967 /* For little endian bits, we need to have a non-zero at_bit_size,
968 so that we know we are in fact dealing with a bitfield. Compute
969 the bit offset to the MSB of the anonymous object, subtract off
970 the number of bits from the MSB of the field to the MSB of the
971 object, and then subtract off the number of bits of the field
972 itself. The result is the bit offset of the LSB of the field. */
973 if (mbr
.at_bit_size
> 0)
975 if (mbr
.has_at_byte_size
)
977 /* The size of the anonymous object containing the bit field
978 is explicit, so use the indicated size (in bytes). */
979 anonymous_size
= mbr
.at_byte_size
;
983 /* The size of the anonymous object containing the bit field
984 matches the size of an object of the bit field's type.
985 DWARF allows at_byte_size to be left out in such cases,
986 as a debug information size optimization. */
987 anonymous_size
= TYPE_LENGTH (list
-> field
.type
);
989 list
-> field
.bitpos
+=
990 anonymous_size
* 8 - mbr
.at_bit_offset
- mbr
.at_bit_size
;
996 process_dies (thisdie
, nextdie
, objfile
);
1001 /* Now create the vector of fields, and record how big it is. We may
1002 not even have any fields, if this DIE was generated due to a reference
1003 to an anonymous structure or union. In this case, TYPE_FLAG_STUB is
1004 set, which clues gdb in to the fact that it needs to search elsewhere
1005 for the full structure definition. */
1008 TYPE_FLAGS (type
) |= TYPE_FLAG_STUB
;
1012 TYPE_NFIELDS (type
) = nfields
;
1013 TYPE_FIELDS (type
) = (struct field
*)
1014 TYPE_ALLOC (type
, sizeof (struct field
) * nfields
);
1015 /* Copy the saved-up fields into the field vector. */
1016 for (n
= nfields
; list
; list
= list
-> next
)
1018 TYPE_FIELD (type
, --n
) = list
-> field
;
1028 read_structure_scope -- process all dies within struct or union
1032 static void read_structure_scope (struct dieinfo *dip,
1033 char *thisdie, char *enddie, struct objfile *objfile)
1037 Called when we find the DIE that starts a structure or union
1038 scope (definition) to process all dies that define the members
1039 of the structure or union. DIP is a pointer to the die info
1040 struct for the DIE that names the structure or union.
1044 Note that we need to call struct_type regardless of whether or not
1045 the DIE has an at_name attribute, since it might be an anonymous
1046 structure or union. This gets the type entered into our set of
1049 However, if the structure is incomplete (an opaque struct/union)
1050 then suppress creating a symbol table entry for it since gdb only
1051 wants to find the one with the complete definition. Note that if
1052 it is complete, we just call new_symbol, which does it's own
1053 checking about whether the struct/union is anonymous or not (and
1054 suppresses creating a symbol table entry itself).
1059 read_structure_scope (dip
, thisdie
, enddie
, objfile
)
1060 struct dieinfo
*dip
;
1063 struct objfile
*objfile
;
1068 type
= struct_type (dip
, thisdie
, enddie
, objfile
);
1069 if (!(TYPE_FLAGS (type
) & TYPE_FLAG_STUB
))
1071 sym
= new_symbol (dip
, objfile
);
1074 SYMBOL_TYPE (sym
) = type
;
1075 if (cu_language
== language_cplus
)
1077 synthesize_typedef (dip
, objfile
, type
);
1087 decode_array_element_type -- decode type of the array elements
1091 static struct type *decode_array_element_type (char *scan, char *end)
1095 As the last step in decoding the array subscript information for an
1096 array DIE, we need to decode the type of the array elements. We are
1097 passed a pointer to this last part of the subscript information and
1098 must return the appropriate type. If the type attribute is not
1099 recognized, just warn about the problem and return type int.
1102 static struct type
*
1103 decode_array_element_type (scan
)
1108 unsigned short attribute
;
1109 unsigned short fundtype
;
1112 attribute
= target_to_host (scan
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
,
1114 scan
+= SIZEOF_ATTRIBUTE
;
1115 if ((nbytes
= attribute_size (attribute
)) == -1)
1117 SQUAWK (("bad array element type attribute 0x%x", attribute
));
1118 typep
= lookup_fundamental_type (current_objfile
, FT_INTEGER
);
1125 fundtype
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1127 typep
= decode_fund_type (fundtype
);
1129 case AT_mod_fund_type
:
1130 typep
= decode_mod_fund_type (scan
);
1132 case AT_user_def_type
:
1133 die_ref
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1135 if ((typep
= lookup_utype (die_ref
)) == NULL
)
1137 typep
= alloc_utype (die_ref
, NULL
);
1140 case AT_mod_u_d_type
:
1141 typep
= decode_mod_u_d_type (scan
);
1144 SQUAWK (("bad array element type attribute 0x%x", attribute
));
1145 typep
= lookup_fundamental_type (current_objfile
, FT_INTEGER
);
1156 decode_subscr_data -- decode array subscript and element type data
1160 static struct type *decode_subscr_data (char *scan, char *end)
1164 The array subscripts and the data type of the elements of an
1165 array are described by a list of data items, stored as a block
1166 of contiguous bytes. There is a data item describing each array
1167 dimension, and a final data item describing the element type.
1168 The data items are ordered the same as their appearance in the
1169 source (I.E. leftmost dimension first, next to leftmost second,
1172 We are passed a pointer to the start of the block of bytes
1173 containing the data items, and a pointer to the first byte past
1174 the data. This function decodes the data and returns a type.
1177 FIXME: This code only implements the forms currently used
1178 by the AT&T and GNU C compilers.
1180 The end pointer is supplied for error checking, maybe we should
1184 static struct type
*
1185 decode_subscr_data (scan
, end
)
1189 struct type
*typep
= NULL
;
1190 struct type
*nexttype
;
1191 unsigned int format
;
1192 unsigned short fundtype
;
1193 unsigned long lowbound
;
1194 unsigned long highbound
;
1197 format
= target_to_host (scan
, SIZEOF_FORMAT_SPECIFIER
, GET_UNSIGNED
,
1199 scan
+= SIZEOF_FORMAT_SPECIFIER
;
1203 typep
= decode_array_element_type (scan
);
1206 fundtype
= target_to_host (scan
, SIZEOF_FMT_FT
, GET_UNSIGNED
,
1208 scan
+= SIZEOF_FMT_FT
;
1209 if (fundtype
!= FT_integer
&& fundtype
!= FT_signed_integer
1210 && fundtype
!= FT_unsigned_integer
)
1212 SQUAWK (("array subscripts must be integral types, not type 0x%x",
1217 nbytes
= TARGET_FT_LONG_SIZE (current_objfile
);
1218 lowbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1221 highbound
= target_to_host (scan
, nbytes
, GET_UNSIGNED
,
1224 nexttype
= decode_subscr_data (scan
, end
);
1225 if (nexttype
!= NULL
)
1227 typep
= alloc_type (current_objfile
);
1228 TYPE_CODE (typep
) = TYPE_CODE_ARRAY
;
1229 TYPE_LENGTH (typep
) = TYPE_LENGTH (nexttype
);
1230 TYPE_LENGTH (typep
) *= (highbound
- lowbound
) + 1;
1231 TYPE_TARGET_TYPE (typep
) = nexttype
;
1242 SQUAWK (("array subscript format 0x%x not handled yet", format
));
1245 SQUAWK (("unknown array subscript format %x", format
));
1255 dwarf_read_array_type -- read TAG_array_type DIE
1259 static void dwarf_read_array_type (struct dieinfo *dip)
1263 Extract all information from a TAG_array_type DIE and add to
1264 the user defined type vector.
1268 dwarf_read_array_type (dip
)
1269 struct dieinfo
*dip
;
1275 unsigned short blocksz
;
1278 if (dip
-> at_ordering
!= ORD_row_major
)
1280 /* FIXME: Can gdb even handle column major arrays? */
1281 SQUAWK (("array not row major; not handled correctly"));
1283 if ((sub
= dip
-> at_subscr_data
) != NULL
)
1285 nbytes
= attribute_size (AT_subscr_data
);
1286 blocksz
= target_to_host (sub
, nbytes
, GET_UNSIGNED
, current_objfile
);
1287 subend
= sub
+ nbytes
+ blocksz
;
1289 type
= decode_subscr_data (sub
, subend
);
1292 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1294 utype
= alloc_utype (dip
-> die_ref
, NULL
);
1296 TYPE_CODE (utype
) = TYPE_CODE_ARRAY
;
1297 TYPE_TARGET_TYPE (utype
) =
1298 lookup_fundamental_type (current_objfile
, FT_INTEGER
);
1299 TYPE_LENGTH (utype
) = 1 * TYPE_LENGTH (TYPE_TARGET_TYPE (utype
));
1303 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1305 alloc_utype (dip
-> die_ref
, type
);
1309 TYPE_CODE (utype
) = TYPE_CODE_ARRAY
;
1310 TYPE_LENGTH (utype
) = TYPE_LENGTH (type
);
1311 TYPE_TARGET_TYPE (utype
) = TYPE_TARGET_TYPE (type
);
1321 read_tag_pointer_type -- read TAG_pointer_type DIE
1325 static void read_tag_pointer_type (struct dieinfo *dip)
1329 Extract all information from a TAG_pointer_type DIE and add to
1330 the user defined type vector.
1334 read_tag_pointer_type (dip
)
1335 struct dieinfo
*dip
;
1340 type
= decode_die_type (dip
);
1341 if ((utype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1343 utype
= lookup_pointer_type (type
);
1344 alloc_utype (dip
-> die_ref
, utype
);
1348 TYPE_TARGET_TYPE (utype
) = type
;
1349 TYPE_POINTER_TYPE (type
) = utype
;
1351 /* We assume the machine has only one representation for pointers! */
1352 /* FIXME: This confuses host<->target data representations, and is a
1353 poor assumption besides. */
1355 TYPE_LENGTH (utype
) = sizeof (char *);
1356 TYPE_CODE (utype
) = TYPE_CODE_PTR
;
1364 read_subroutine_type -- process TAG_subroutine_type dies
1368 static void read_subroutine_type (struct dieinfo *dip, char thisdie,
1373 Handle DIES due to C code like:
1376 int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE)
1382 The parameter DIES are currently ignored. See if gdb has a way to
1383 include this info in it's type system, and decode them if so. Is
1384 this what the type structure's "arg_types" field is for? (FIXME)
1388 read_subroutine_type (dip
, thisdie
, enddie
)
1389 struct dieinfo
*dip
;
1393 struct type
*type
; /* Type that this function returns */
1394 struct type
*ftype
; /* Function that returns above type */
1396 /* Decode the type that this subroutine returns */
1398 type
= decode_die_type (dip
);
1400 /* Check to see if we already have a partially constructed user
1401 defined type for this DIE, from a forward reference. */
1403 if ((ftype
= lookup_utype (dip
-> die_ref
)) == NULL
)
1405 /* This is the first reference to one of these types. Make
1406 a new one and place it in the user defined types. */
1407 ftype
= lookup_function_type (type
);
1408 alloc_utype (dip
-> die_ref
, ftype
);
1412 /* We have an existing partially constructed type, so bash it
1413 into the correct type. */
1414 TYPE_TARGET_TYPE (ftype
) = type
;
1415 TYPE_FUNCTION_TYPE (type
) = ftype
;
1416 TYPE_LENGTH (ftype
) = 1;
1417 TYPE_CODE (ftype
) = TYPE_CODE_FUNC
;
1425 read_enumeration -- process dies which define an enumeration
1429 static void read_enumeration (struct dieinfo *dip, char *thisdie,
1430 char *enddie, struct objfile *objfile)
1434 Given a pointer to a die which begins an enumeration, process all
1435 the dies that define the members of the enumeration.
1439 Note that we need to call enum_type regardless of whether or not we
1440 have a symbol, since we might have an enum without a tag name (thus
1441 no symbol for the tagname).
1445 read_enumeration (dip
, thisdie
, enddie
, objfile
)
1446 struct dieinfo
*dip
;
1449 struct objfile
*objfile
;
1454 type
= enum_type (dip
, objfile
);
1455 sym
= new_symbol (dip
, objfile
);
1458 SYMBOL_TYPE (sym
) = type
;
1459 if (cu_language
== language_cplus
)
1461 synthesize_typedef (dip
, objfile
, type
);
1470 enum_type -- decode and return a type for an enumeration
1474 static type *enum_type (struct dieinfo *dip, struct objfile *objfile)
1478 Given a pointer to a die information structure for the die which
1479 starts an enumeration, process all the dies that define the members
1480 of the enumeration and return a type pointer for the enumeration.
1482 At the same time, for each member of the enumeration, create a
1483 symbol for it with namespace VAR_NAMESPACE and class LOC_CONST,
1484 and give it the type of the enumeration itself.
1488 Note that the DWARF specification explicitly mandates that enum
1489 constants occur in reverse order from the source program order,
1490 for "consistency" and because this ordering is easier for many
1491 compilers to generate. (Draft 6, sec 3.8.5, Enumeration type
1492 Entries). Because gdb wants to see the enum members in program
1493 source order, we have to ensure that the order gets reversed while
1494 we are processing them.
1497 static struct type
*
1498 enum_type (dip
, objfile
)
1499 struct dieinfo
*dip
;
1500 struct objfile
*objfile
;
1504 struct nextfield
*next
;
1507 struct nextfield
*list
= NULL
;
1508 struct nextfield
*new;
1513 unsigned short blocksz
;
1517 if ((type
= lookup_utype (dip
-> die_ref
)) == NULL
)
1519 /* No forward references created an empty type, so install one now */
1520 type
= alloc_utype (dip
-> die_ref
, NULL
);
1522 TYPE_CODE (type
) = TYPE_CODE_ENUM
;
1523 /* Some compilers try to be helpful by inventing "fake" names for
1524 anonymous enums, structures, and unions, like "~0fake" or ".0fake".
1525 Thanks, but no thanks... */
1526 if (dip
-> at_name
!= NULL
1527 && *dip
-> at_name
!= '~'
1528 && *dip
-> at_name
!= '.')
1530 TYPE_NAME (type
) = obconcat (&objfile
-> type_obstack
, "enum",
1531 " ", dip
-> at_name
);
1533 if (dip
-> at_byte_size
!= 0)
1535 TYPE_LENGTH (type
) = dip
-> at_byte_size
;
1537 if ((scan
= dip
-> at_element_list
) != NULL
)
1539 if (dip
-> short_element_list
)
1541 nbytes
= attribute_size (AT_short_element_list
);
1545 nbytes
= attribute_size (AT_element_list
);
1547 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
1548 listend
= scan
+ nbytes
+ blocksz
;
1550 while (scan
< listend
)
1552 new = (struct nextfield
*) alloca (sizeof (struct nextfield
));
1555 list
-> field
.type
= NULL
;
1556 list
-> field
.bitsize
= 0;
1557 list
-> field
.bitpos
=
1558 target_to_host (scan
, TARGET_FT_LONG_SIZE (objfile
), GET_SIGNED
,
1560 scan
+= TARGET_FT_LONG_SIZE (objfile
);
1561 list
-> field
.name
= obsavestring (scan
, strlen (scan
),
1562 &objfile
-> type_obstack
);
1563 scan
+= strlen (scan
) + 1;
1565 /* Handcraft a new symbol for this enum member. */
1566 sym
= (struct symbol
*) obstack_alloc (&objfile
->symbol_obstack
,
1567 sizeof (struct symbol
));
1568 memset (sym
, 0, sizeof (struct symbol
));
1569 SYMBOL_NAME (sym
) = create_name (list
-> field
.name
,
1570 &objfile
->symbol_obstack
);
1571 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
1572 SYMBOL_CLASS (sym
) = LOC_CONST
;
1573 SYMBOL_TYPE (sym
) = type
;
1574 SYMBOL_VALUE (sym
) = list
-> field
.bitpos
;
1575 add_symbol_to_list (sym
, list_in_scope
);
1577 /* Now create the vector of fields, and record how big it is. This is
1578 where we reverse the order, by pulling the members off the list in
1579 reverse order from how they were inserted. If we have no fields
1580 (this is apparently possible in C++) then skip building a field
1584 TYPE_NFIELDS (type
) = nfields
;
1585 TYPE_FIELDS (type
) = (struct field
*)
1586 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct field
) * nfields
);
1587 /* Copy the saved-up fields into the field vector. */
1588 for (n
= 0; (n
< nfields
) && (list
!= NULL
); list
= list
-> next
)
1590 TYPE_FIELD (type
, n
++) = list
-> field
;
1601 read_func_scope -- process all dies within a function scope
1605 Process all dies within a given function scope. We are passed
1606 a die information structure pointer DIP for the die which
1607 starts the function scope, and pointers into the raw die data
1608 that define the dies within the function scope.
1610 For now, we ignore lexical block scopes within the function.
1611 The problem is that AT&T cc does not define a DWARF lexical
1612 block scope for the function itself, while gcc defines a
1613 lexical block scope for the function. We need to think about
1614 how to handle this difference, or if it is even a problem.
1619 read_func_scope (dip
, thisdie
, enddie
, objfile
)
1620 struct dieinfo
*dip
;
1623 struct objfile
*objfile
;
1625 register struct context_stack
*new;
1627 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1628 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1630 objfile
-> ei
.entry_func_lowpc
= dip
-> at_low_pc
;
1631 objfile
-> ei
.entry_func_highpc
= dip
-> at_high_pc
;
1633 if (STREQ (dip
-> at_name
, "main")) /* FIXME: hardwired name */
1635 objfile
-> ei
.main_func_lowpc
= dip
-> at_low_pc
;
1636 objfile
-> ei
.main_func_highpc
= dip
-> at_high_pc
;
1638 new = push_context (0, dip
-> at_low_pc
);
1639 new -> name
= new_symbol (dip
, objfile
);
1640 list_in_scope
= &local_symbols
;
1641 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1642 new = pop_context ();
1643 /* Make a block for the local symbols within. */
1644 finish_block (new -> name
, &local_symbols
, new -> old_blocks
,
1645 new -> start_addr
, dip
-> at_high_pc
, objfile
);
1646 list_in_scope
= &file_symbols
;
1654 handle_producer -- process the AT_producer attribute
1658 Perform any operations that depend on finding a particular
1659 AT_producer attribute.
1664 handle_producer (producer
)
1668 /* If this compilation unit was compiled with g++ or gcc, then set the
1669 processing_gcc_compilation flag. */
1671 processing_gcc_compilation
=
1672 STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
))
1673 || STREQN (producer
, GCC_PRODUCER
, strlen (GCC_PRODUCER
));
1675 /* Select a demangling style if we can identify the producer and if
1676 the current style is auto. We leave the current style alone if it
1677 is not auto. We also leave the demangling style alone if we find a
1678 gcc (cc1) producer, as opposed to a g++ (cc1plus) producer. */
1680 #if 1 /* Works, but is experimental. -fnf */
1681 if (AUTO_DEMANGLING
)
1683 if (STREQN (producer
, GPLUS_PRODUCER
, strlen (GPLUS_PRODUCER
)))
1685 set_demangling_style (GNU_DEMANGLING_STYLE_STRING
);
1687 else if (STREQN (producer
, LCC_PRODUCER
, strlen (LCC_PRODUCER
)))
1689 set_demangling_style (LUCID_DEMANGLING_STYLE_STRING
);
1691 else if (STREQN (producer
, CFRONT_PRODUCER
, strlen (CFRONT_PRODUCER
)))
1693 set_demangling_style (CFRONT_DEMANGLING_STYLE_STRING
);
1704 read_file_scope -- process all dies within a file scope
1708 Process all dies within a given file scope. We are passed a
1709 pointer to the die information structure for the die which
1710 starts the file scope, and pointers into the raw die data which
1711 mark the range of dies within the file scope.
1713 When the partial symbol table is built, the file offset for the line
1714 number table for each compilation unit is saved in the partial symbol
1715 table entry for that compilation unit. As the symbols for each
1716 compilation unit are read, the line number table is read into memory
1717 and the variable lnbase is set to point to it. Thus all we have to
1718 do is use lnbase to access the line number table for the current
1723 read_file_scope (dip
, thisdie
, enddie
, objfile
)
1724 struct dieinfo
*dip
;
1727 struct objfile
*objfile
;
1729 struct cleanup
*back_to
;
1730 struct symtab
*symtab
;
1732 if (objfile
-> ei
.entry_point
>= dip
-> at_low_pc
&&
1733 objfile
-> ei
.entry_point
< dip
-> at_high_pc
)
1735 objfile
-> ei
.entry_file_lowpc
= dip
-> at_low_pc
;
1736 objfile
-> ei
.entry_file_highpc
= dip
-> at_high_pc
;
1738 set_cu_language (dip
);
1739 if (dip
-> at_producer
!= NULL
)
1741 handle_producer (dip
-> at_producer
);
1743 numutypes
= (enddie
- thisdie
) / 4;
1744 utypes
= (struct type
**) xmalloc (numutypes
* sizeof (struct type
*));
1745 back_to
= make_cleanup (free
, utypes
);
1746 memset (utypes
, 0, numutypes
* sizeof (struct type
*));
1747 start_symtab (dip
-> at_name
, dip
-> at_comp_dir
, dip
-> at_low_pc
);
1748 decode_line_numbers (lnbase
);
1749 process_dies (thisdie
+ dip
-> die_length
, enddie
, objfile
);
1750 symtab
= end_symtab (dip
-> at_high_pc
, 0, 0, objfile
);
1753 symtab
-> language
= cu_language
;
1755 do_cleanups (back_to
);
1764 process_dies -- process a range of DWARF Information Entries
1768 static void process_dies (char *thisdie, char *enddie,
1769 struct objfile *objfile)
1773 Process all DIE's in a specified range. May be (and almost
1774 certainly will be) called recursively.
1778 process_dies (thisdie
, enddie
, objfile
)
1781 struct objfile
*objfile
;
1786 while (thisdie
< enddie
)
1788 basicdieinfo (&di
, thisdie
, objfile
);
1789 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
1793 else if (di
.die_tag
== TAG_padding
)
1795 nextdie
= thisdie
+ di
.die_length
;
1799 completedieinfo (&di
, objfile
);
1800 if (di
.at_sibling
!= 0)
1802 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
1806 nextdie
= thisdie
+ di
.die_length
;
1810 case TAG_compile_unit
:
1811 read_file_scope (&di
, thisdie
, nextdie
, objfile
);
1813 case TAG_global_subroutine
:
1814 case TAG_subroutine
:
1815 if (di
.has_at_low_pc
)
1817 read_func_scope (&di
, thisdie
, nextdie
, objfile
);
1820 case TAG_lexical_block
:
1821 read_lexical_block_scope (&di
, thisdie
, nextdie
, objfile
);
1823 case TAG_class_type
:
1824 case TAG_structure_type
:
1825 case TAG_union_type
:
1826 read_structure_scope (&di
, thisdie
, nextdie
, objfile
);
1828 case TAG_enumeration_type
:
1829 read_enumeration (&di
, thisdie
, nextdie
, objfile
);
1831 case TAG_subroutine_type
:
1832 read_subroutine_type (&di
, thisdie
, nextdie
);
1834 case TAG_array_type
:
1835 dwarf_read_array_type (&di
);
1837 case TAG_pointer_type
:
1838 read_tag_pointer_type (&di
);
1841 new_symbol (&di
, objfile
);
1853 decode_line_numbers -- decode a line number table fragment
1857 static void decode_line_numbers (char *tblscan, char *tblend,
1858 long length, long base, long line, long pc)
1862 Translate the DWARF line number information to gdb form.
1864 The ".line" section contains one or more line number tables, one for
1865 each ".line" section from the objects that were linked.
1867 The AT_stmt_list attribute for each TAG_source_file entry in the
1868 ".debug" section contains the offset into the ".line" section for the
1869 start of the table for that file.
1871 The table itself has the following structure:
1873 <table length><base address><source statement entry>
1874 4 bytes 4 bytes 10 bytes
1876 The table length is the total size of the table, including the 4 bytes
1877 for the length information.
1879 The base address is the address of the first instruction generated
1880 for the source file.
1882 Each source statement entry has the following structure:
1884 <line number><statement position><address delta>
1885 4 bytes 2 bytes 4 bytes
1887 The line number is relative to the start of the file, starting with
1890 The statement position either -1 (0xFFFF) or the number of characters
1891 from the beginning of the line to the beginning of the statement.
1893 The address delta is the difference between the base address and
1894 the address of the first instruction for the statement.
1896 Note that we must copy the bytes from the packed table to our local
1897 variables before attempting to use them, to avoid alignment problems
1898 on some machines, particularly RISC processors.
1902 Does gdb expect the line numbers to be sorted? They are now by
1903 chance/luck, but are not required to be. (FIXME)
1905 The line with number 0 is unused, gdb apparently can discover the
1906 span of the last line some other way. How? (FIXME)
1910 decode_line_numbers (linetable
)
1915 unsigned long length
;
1920 if (linetable
!= NULL
)
1922 tblscan
= tblend
= linetable
;
1923 length
= target_to_host (tblscan
, SIZEOF_LINETBL_LENGTH
, GET_UNSIGNED
,
1925 tblscan
+= SIZEOF_LINETBL_LENGTH
;
1927 base
= target_to_host (tblscan
, TARGET_FT_POINTER_SIZE (objfile
),
1928 GET_UNSIGNED
, current_objfile
);
1929 tblscan
+= TARGET_FT_POINTER_SIZE (objfile
);
1931 while (tblscan
< tblend
)
1933 line
= target_to_host (tblscan
, SIZEOF_LINETBL_LINENO
, GET_UNSIGNED
,
1935 tblscan
+= SIZEOF_LINETBL_LINENO
+ SIZEOF_LINETBL_STMT
;
1936 pc
= target_to_host (tblscan
, SIZEOF_LINETBL_DELTA
, GET_UNSIGNED
,
1938 tblscan
+= SIZEOF_LINETBL_DELTA
;
1942 record_line (current_subfile
, line
, pc
);
1952 locval -- compute the value of a location attribute
1956 static int locval (char *loc)
1960 Given pointer to a string of bytes that define a location, compute
1961 the location and return the value.
1963 When computing values involving the current value of the frame pointer,
1964 the value zero is used, which results in a value relative to the frame
1965 pointer, rather than the absolute value. This is what GDB wants
1968 When the result is a register number, the global isreg flag is set,
1969 otherwise it is cleared. This is a kludge until we figure out a better
1970 way to handle the problem. Gdb's design does not mesh well with the
1971 DWARF notion of a location computing interpreter, which is a shame
1972 because the flexibility goes unused.
1976 Note that stack[0] is unused except as a default error return.
1977 Note that stack overflow is not yet handled.
1984 unsigned short nbytes
;
1985 unsigned short locsize
;
1986 auto long stack
[64];
1993 nbytes
= attribute_size (AT_location
);
1994 locsize
= target_to_host (loc
, nbytes
, GET_UNSIGNED
, current_objfile
);
1996 end
= loc
+ locsize
;
2001 loc_value_size
= TARGET_FT_LONG_SIZE (current_objfile
);
2004 loc_atom_code
= target_to_host (loc
, SIZEOF_LOC_ATOM_CODE
, GET_UNSIGNED
,
2006 loc
+= SIZEOF_LOC_ATOM_CODE
;
2007 switch (loc_atom_code
)
2014 /* push register (number) */
2015 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2016 GET_UNSIGNED
, current_objfile
);
2017 loc
+= loc_value_size
;
2021 /* push value of register (number) */
2022 /* Actually, we compute the value as if register has 0 */
2024 regno
= target_to_host (loc
, loc_value_size
, GET_UNSIGNED
,
2026 loc
+= loc_value_size
;
2029 stack
[++stacki
] = 0;
2033 stack
[++stacki
] = 0;
2034 SQUAWK (("BASEREG %d not handled!", regno
));
2038 /* push address (relocated address) */
2039 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2040 GET_UNSIGNED
, current_objfile
);
2041 loc
+= loc_value_size
;
2044 /* push constant (number) FIXME: signed or unsigned! */
2045 stack
[++stacki
] = target_to_host (loc
, loc_value_size
,
2046 GET_SIGNED
, current_objfile
);
2047 loc
+= loc_value_size
;
2050 /* pop, deref and push 2 bytes (as a long) */
2051 SQUAWK (("OP_DEREF2 address 0x%x not handled", stack
[stacki
]));
2053 case OP_DEREF4
: /* pop, deref and push 4 bytes (as a long) */
2054 SQUAWK (("OP_DEREF4 address 0x%x not handled", stack
[stacki
]));
2056 case OP_ADD
: /* pop top 2 items, add, push result */
2057 stack
[stacki
- 1] += stack
[stacki
];
2062 return (stack
[stacki
]);
2069 read_ofile_symtab -- build a full symtab entry from chunk of DIE's
2073 static struct symtab *read_ofile_symtab (struct partial_symtab *pst)
2077 When expanding a partial symbol table entry to a full symbol table
2078 entry, this is the function that gets called to read in the symbols
2079 for the compilation unit.
2081 Returns a pointer to the newly constructed symtab (which is now
2082 the new first one on the objfile's symtab list).
2085 static struct symtab
*
2086 read_ofile_symtab (pst
)
2087 struct partial_symtab
*pst
;
2089 struct cleanup
*back_to
;
2090 unsigned long lnsize
;
2093 char lnsizedata
[SIZEOF_LINETBL_LENGTH
];
2095 abfd
= pst
-> objfile
-> obfd
;
2096 current_objfile
= pst
-> objfile
;
2098 /* Allocate a buffer for the entire chunk of DIE's for this compilation
2099 unit, seek to the location in the file, and read in all the DIE's. */
2102 dbsize
= DBLENGTH (pst
);
2103 dbbase
= xmalloc (dbsize
);
2104 dbroff
= DBROFF(pst
);
2105 foffset
= DBFOFF(pst
) + dbroff
;
2106 base_section_offsets
= pst
->section_offsets
;
2107 baseaddr
= ANOFFSET (pst
->section_offsets
, 0);
2108 if (bfd_seek (abfd
, foffset
, L_SET
) ||
2109 (bfd_read (dbbase
, dbsize
, 1, abfd
) != dbsize
))
2112 error ("can't read DWARF data");
2114 back_to
= make_cleanup (free
, dbbase
);
2116 /* If there is a line number table associated with this compilation unit
2117 then read the size of this fragment in bytes, from the fragment itself.
2118 Allocate a buffer for the fragment and read it in for future
2124 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2125 (bfd_read ((PTR
) lnsizedata
, sizeof (lnsizedata
), 1, abfd
) !=
2126 sizeof (lnsizedata
)))
2128 error ("can't read DWARF line number table size");
2130 lnsize
= target_to_host (lnsizedata
, SIZEOF_LINETBL_LENGTH
,
2131 GET_UNSIGNED
, pst
-> objfile
);
2132 lnbase
= xmalloc (lnsize
);
2133 if (bfd_seek (abfd
, LNFOFF (pst
), L_SET
) ||
2134 (bfd_read (lnbase
, lnsize
, 1, abfd
) != lnsize
))
2137 error ("can't read DWARF line numbers");
2139 make_cleanup (free
, lnbase
);
2142 process_dies (dbbase
, dbbase
+ dbsize
, pst
-> objfile
);
2143 do_cleanups (back_to
);
2144 current_objfile
= NULL
;
2145 return (pst
-> objfile
-> symtabs
);
2152 psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
2156 static void psymtab_to_symtab_1 (struct partial_symtab *pst)
2160 Called once for each partial symbol table entry that needs to be
2161 expanded into a full symbol table entry.
2166 psymtab_to_symtab_1 (pst
)
2167 struct partial_symtab
*pst
;
2170 struct cleanup
*old_chain
;
2176 warning ("psymtab for %s already read in. Shouldn't happen.",
2181 /* Read in all partial symtabs on which this one is dependent */
2182 for (i
= 0; i
< pst
-> number_of_dependencies
; i
++)
2184 if (!pst
-> dependencies
[i
] -> readin
)
2186 /* Inform about additional files that need to be read in. */
2189 fputs_filtered (" ", stdout
);
2191 fputs_filtered ("and ", stdout
);
2193 printf_filtered ("%s...",
2194 pst
-> dependencies
[i
] -> filename
);
2196 fflush (stdout
); /* Flush output */
2198 psymtab_to_symtab_1 (pst
-> dependencies
[i
]);
2201 if (DBLENGTH (pst
)) /* Otherwise it's a dummy */
2204 old_chain
= make_cleanup (really_free_pendings
, 0);
2205 pst
-> symtab
= read_ofile_symtab (pst
);
2208 printf_filtered ("%d DIE's, sorting...", diecount
);
2212 sort_symtab_syms (pst
-> symtab
);
2213 do_cleanups (old_chain
);
2224 dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
2228 static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
2232 This is the DWARF support entry point for building a full symbol
2233 table entry from a partial symbol table entry. We are passed a
2234 pointer to the partial symbol table entry that needs to be expanded.
2239 dwarf_psymtab_to_symtab (pst
)
2240 struct partial_symtab
*pst
;
2247 warning ("psymtab for %s already read in. Shouldn't happen.",
2252 if (DBLENGTH (pst
) || pst
-> number_of_dependencies
)
2254 /* Print the message now, before starting serious work, to avoid
2255 disconcerting pauses. */
2258 printf_filtered ("Reading in symbols for %s...",
2263 psymtab_to_symtab_1 (pst
);
2265 #if 0 /* FIXME: Check to see what dbxread is doing here and see if
2266 we need to do an equivalent or is this something peculiar to
2268 Match with global symbols. This only needs to be done once,
2269 after all of the symtabs and dependencies have been read in.
2271 scan_file_globals (pst
-> objfile
);
2274 /* Finish up the verbose info message. */
2277 printf_filtered ("done.\n");
2289 init_psymbol_list -- initialize storage for partial symbols
2293 static void init_psymbol_list (struct objfile *objfile, int total_symbols)
2297 Initializes storage for all of the partial symbols that will be
2298 created by dwarf_build_psymtabs and subsidiaries.
2302 init_psymbol_list (objfile
, total_symbols
)
2303 struct objfile
*objfile
;
2306 /* Free any previously allocated psymbol lists. */
2308 if (objfile
-> global_psymbols
.list
)
2310 mfree (objfile
-> md
, (PTR
)objfile
-> global_psymbols
.list
);
2312 if (objfile
-> static_psymbols
.list
)
2314 mfree (objfile
-> md
, (PTR
)objfile
-> static_psymbols
.list
);
2317 /* Current best guess is that there are approximately a twentieth
2318 of the total symbols (in a debugging file) are global or static
2321 objfile
-> global_psymbols
.size
= total_symbols
/ 10;
2322 objfile
-> static_psymbols
.size
= total_symbols
/ 10;
2323 objfile
-> global_psymbols
.next
=
2324 objfile
-> global_psymbols
.list
= (struct partial_symbol
*)
2325 xmmalloc (objfile
-> md
, objfile
-> global_psymbols
.size
2326 * sizeof (struct partial_symbol
));
2327 objfile
-> static_psymbols
.next
=
2328 objfile
-> static_psymbols
.list
= (struct partial_symbol
*)
2329 xmmalloc (objfile
-> md
, objfile
-> static_psymbols
.size
2330 * sizeof (struct partial_symbol
));
2337 add_enum_psymbol -- add enumeration members to partial symbol table
2341 Given pointer to a DIE that is known to be for an enumeration,
2342 extract the symbolic names of the enumeration members and add
2343 partial symbols for them.
2347 add_enum_psymbol (dip
, objfile
)
2348 struct dieinfo
*dip
;
2349 struct objfile
*objfile
;
2353 unsigned short blocksz
;
2356 if ((scan
= dip
-> at_element_list
) != NULL
)
2358 if (dip
-> short_element_list
)
2360 nbytes
= attribute_size (AT_short_element_list
);
2364 nbytes
= attribute_size (AT_element_list
);
2366 blocksz
= target_to_host (scan
, nbytes
, GET_UNSIGNED
, objfile
);
2368 listend
= scan
+ blocksz
;
2369 while (scan
< listend
)
2371 scan
+= TARGET_FT_LONG_SIZE (objfile
);
2372 ADD_PSYMBOL_TO_LIST (scan
, strlen (scan
), VAR_NAMESPACE
, LOC_CONST
,
2373 objfile
-> static_psymbols
, 0);
2374 scan
+= strlen (scan
) + 1;
2383 add_partial_symbol -- add symbol to partial symbol table
2387 Given a DIE, if it is one of the types that we want to
2388 add to a partial symbol table, finish filling in the die info
2389 and then add a partial symbol table entry for it.
2393 The caller must ensure that the DIE has a valid name attribute.
2397 add_partial_symbol (dip
, objfile
)
2398 struct dieinfo
*dip
;
2399 struct objfile
*objfile
;
2401 switch (dip
-> die_tag
)
2403 case TAG_global_subroutine
:
2404 record_minimal_symbol (dip
-> at_name
, dip
-> at_low_pc
, mst_text
,
2406 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2407 VAR_NAMESPACE
, LOC_BLOCK
,
2408 objfile
-> global_psymbols
,
2411 case TAG_global_variable
:
2412 record_minimal_symbol (dip
-> at_name
, locval (dip
-> at_location
),
2414 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2415 VAR_NAMESPACE
, LOC_STATIC
,
2416 objfile
-> global_psymbols
,
2419 case TAG_subroutine
:
2420 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2421 VAR_NAMESPACE
, LOC_BLOCK
,
2422 objfile
-> static_psymbols
,
2425 case TAG_local_variable
:
2426 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2427 VAR_NAMESPACE
, LOC_STATIC
,
2428 objfile
-> static_psymbols
,
2432 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2433 VAR_NAMESPACE
, LOC_TYPEDEF
,
2434 objfile
-> static_psymbols
,
2437 case TAG_class_type
:
2438 case TAG_structure_type
:
2439 case TAG_union_type
:
2440 case TAG_enumeration_type
:
2441 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2442 STRUCT_NAMESPACE
, LOC_TYPEDEF
,
2443 objfile
-> static_psymbols
,
2445 if (cu_language
== language_cplus
)
2447 /* For C++, these implicitly act as typedefs as well. */
2448 ADD_PSYMBOL_TO_LIST (dip
-> at_name
, strlen (dip
-> at_name
),
2449 VAR_NAMESPACE
, LOC_TYPEDEF
,
2450 objfile
-> static_psymbols
,
2461 scan_partial_symbols -- scan DIE's within a single compilation unit
2465 Process the DIE's within a single compilation unit, looking for
2466 interesting DIE's that contribute to the partial symbol table entry
2467 for this compilation unit.
2471 There are some DIE's that may appear both at file scope and within
2472 the scope of a function. We are only interested in the ones at file
2473 scope, and the only way to tell them apart is to keep track of the
2474 scope. For example, consider the test case:
2479 for which the relevant DWARF segment has the structure:
2482 0x23 global subrtn sibling 0x9b
2484 fund_type FT_integer
2489 0x23 local var sibling 0x97
2491 fund_type FT_integer
2492 location OP_BASEREG 0xe
2499 0x1d local var sibling 0xb8
2501 fund_type FT_integer
2502 location OP_ADDR 0x800025dc
2507 We want to include the symbol 'i' in the partial symbol table, but
2508 not the symbol 'j'. In essence, we want to skip all the dies within
2509 the scope of a TAG_global_subroutine DIE.
2511 Don't attempt to add anonymous structures or unions since they have
2512 no name. Anonymous enumerations however are processed, because we
2513 want to extract their member names (the check for a tag name is
2516 Also, for variables and subroutines, check that this is the place
2517 where the actual definition occurs, rather than just a reference
2522 scan_partial_symbols (thisdie
, enddie
, objfile
)
2525 struct objfile
*objfile
;
2531 while (thisdie
< enddie
)
2533 basicdieinfo (&di
, thisdie
, objfile
);
2534 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2540 nextdie
= thisdie
+ di
.die_length
;
2541 /* To avoid getting complete die information for every die, we
2542 only do it (below) for the cases we are interested in. */
2545 case TAG_global_subroutine
:
2546 case TAG_subroutine
:
2547 completedieinfo (&di
, objfile
);
2548 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2550 add_partial_symbol (&di
, objfile
);
2551 /* If there is a sibling attribute, adjust the nextdie
2552 pointer to skip the entire scope of the subroutine.
2553 Apply some sanity checking to make sure we don't
2554 overrun or underrun the range of remaining DIE's */
2555 if (di
.at_sibling
!= 0)
2557 temp
= dbbase
+ di
.at_sibling
- dbroff
;
2558 if ((temp
< thisdie
) || (temp
>= enddie
))
2560 dwarfwarn ("reference to DIE (0x%x) outside compilation unit", di
.at_sibling
);
2569 case TAG_global_variable
:
2570 case TAG_local_variable
:
2571 completedieinfo (&di
, objfile
);
2572 if (di
.at_name
&& (di
.has_at_low_pc
|| di
.at_location
))
2574 add_partial_symbol (&di
, objfile
);
2578 case TAG_class_type
:
2579 case TAG_structure_type
:
2580 case TAG_union_type
:
2581 completedieinfo (&di
, objfile
);
2584 add_partial_symbol (&di
, objfile
);
2587 case TAG_enumeration_type
:
2588 completedieinfo (&di
, objfile
);
2591 add_partial_symbol (&di
, objfile
);
2593 add_enum_psymbol (&di
, objfile
);
2605 scan_compilation_units -- build a psymtab entry for each compilation
2609 This is the top level dwarf parsing routine for building partial
2612 It scans from the beginning of the DWARF table looking for the first
2613 TAG_compile_unit DIE, and then follows the sibling chain to locate
2614 each additional TAG_compile_unit DIE.
2616 For each TAG_compile_unit DIE it creates a partial symtab structure,
2617 calls a subordinate routine to collect all the compilation unit's
2618 global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
2619 new partial symtab structure into the partial symbol table. It also
2620 records the appropriate information in the partial symbol table entry
2621 to allow the chunk of DIE's and line number table for this compilation
2622 unit to be located and re-read later, to generate a complete symbol
2623 table entry for the compilation unit.
2625 Thus it effectively partitions up a chunk of DIE's for multiple
2626 compilation units into smaller DIE chunks and line number tables,
2627 and associates them with a partial symbol table entry.
2631 If any compilation unit has no line number table associated with
2632 it for some reason (a missing at_stmt_list attribute, rather than
2633 just one with a value of zero, which is valid) then we ensure that
2634 the recorded file offset is zero so that the routine which later
2635 reads line number table fragments knows that there is no fragment
2645 scan_compilation_units (thisdie
, enddie
, dbfoff
, lnoffset
, objfile
)
2650 struct objfile
*objfile
;
2654 struct partial_symtab
*pst
;
2657 file_ptr curlnoffset
;
2659 while (thisdie
< enddie
)
2661 basicdieinfo (&di
, thisdie
, objfile
);
2662 if (di
.die_length
< SIZEOF_DIE_LENGTH
)
2666 else if (di
.die_tag
!= TAG_compile_unit
)
2668 nextdie
= thisdie
+ di
.die_length
;
2672 completedieinfo (&di
, objfile
);
2673 set_cu_language (&di
);
2674 if (di
.at_sibling
!= 0)
2676 nextdie
= dbbase
+ di
.at_sibling
- dbroff
;
2680 nextdie
= thisdie
+ di
.die_length
;
2682 curoff
= thisdie
- dbbase
;
2683 culength
= nextdie
- thisdie
;
2684 curlnoffset
= di
.has_at_stmt_list
? lnoffset
+ di
.at_stmt_list
: 0;
2686 /* First allocate a new partial symbol table structure */
2688 pst
= start_psymtab_common (objfile
, base_section_offsets
,
2689 di
.at_name
, di
.at_low_pc
,
2690 objfile
-> global_psymbols
.next
,
2691 objfile
-> static_psymbols
.next
);
2693 pst
-> texthigh
= di
.at_high_pc
;
2694 pst
-> read_symtab_private
= (char *)
2695 obstack_alloc (&objfile
-> psymbol_obstack
,
2696 sizeof (struct dwfinfo
));
2697 DBFOFF (pst
) = dbfoff
;
2698 DBROFF (pst
) = curoff
;
2699 DBLENGTH (pst
) = culength
;
2700 LNFOFF (pst
) = curlnoffset
;
2701 pst
-> read_symtab
= dwarf_psymtab_to_symtab
;
2703 /* Now look for partial symbols */
2705 scan_partial_symbols (thisdie
+ di
.die_length
, nextdie
, objfile
);
2707 pst
-> n_global_syms
= objfile
-> global_psymbols
.next
-
2708 (objfile
-> global_psymbols
.list
+ pst
-> globals_offset
);
2709 pst
-> n_static_syms
= objfile
-> static_psymbols
.next
-
2710 (objfile
-> static_psymbols
.list
+ pst
-> statics_offset
);
2711 sort_pst_symbols (pst
);
2712 /* If there is already a psymtab or symtab for a file of this name,
2713 remove it. (If there is a symtab, more drastic things also
2714 happen.) This happens in VxWorks. */
2715 free_named_symtabs (pst
-> filename
);
2725 new_symbol -- make a symbol table entry for a new symbol
2729 static struct symbol *new_symbol (struct dieinfo *dip,
2730 struct objfile *objfile)
2734 Given a pointer to a DWARF information entry, figure out if we need
2735 to make a symbol table entry for it, and if so, create a new entry
2736 and return a pointer to it.
2739 static struct symbol
*
2740 new_symbol (dip
, objfile
)
2741 struct dieinfo
*dip
;
2742 struct objfile
*objfile
;
2744 struct symbol
*sym
= NULL
;
2746 if (dip
-> at_name
!= NULL
)
2748 sym
= (struct symbol
*) obstack_alloc (&objfile
-> symbol_obstack
,
2749 sizeof (struct symbol
));
2750 memset (sym
, 0, sizeof (struct symbol
));
2751 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2752 &objfile
->symbol_obstack
);
2753 /* default assumptions */
2754 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2755 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2756 SYMBOL_TYPE (sym
) = decode_die_type (dip
);
2757 switch (dip
-> die_tag
)
2760 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2761 SYMBOL_CLASS (sym
) = LOC_LABEL
;
2763 case TAG_global_subroutine
:
2764 case TAG_subroutine
:
2765 SYMBOL_VALUE (sym
) = dip
-> at_low_pc
;
2766 SYMBOL_TYPE (sym
) = lookup_function_type (SYMBOL_TYPE (sym
));
2767 SYMBOL_CLASS (sym
) = LOC_BLOCK
;
2768 if (dip
-> die_tag
== TAG_global_subroutine
)
2770 add_symbol_to_list (sym
, &global_symbols
);
2774 add_symbol_to_list (sym
, list_in_scope
);
2777 case TAG_global_variable
:
2778 if (dip
-> at_location
!= NULL
)
2780 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2781 add_symbol_to_list (sym
, &global_symbols
);
2782 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2783 SYMBOL_VALUE (sym
) += baseaddr
;
2786 case TAG_local_variable
:
2787 if (dip
-> at_location
!= NULL
)
2789 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2790 add_symbol_to_list (sym
, list_in_scope
);
2793 SYMBOL_CLASS (sym
) = LOC_REGISTER
;
2797 SYMBOL_CLASS (sym
) = LOC_LOCAL
;
2801 SYMBOL_CLASS (sym
) = LOC_STATIC
;
2802 SYMBOL_VALUE (sym
) += baseaddr
;
2806 case TAG_formal_parameter
:
2807 if (dip
-> at_location
!= NULL
)
2809 SYMBOL_VALUE (sym
) = locval (dip
-> at_location
);
2811 add_symbol_to_list (sym
, list_in_scope
);
2814 SYMBOL_CLASS (sym
) = LOC_REGPARM
;
2818 SYMBOL_CLASS (sym
) = LOC_ARG
;
2821 case TAG_unspecified_parameters
:
2822 /* From varargs functions; gdb doesn't seem to have any interest in
2823 this information, so just ignore it for now. (FIXME?) */
2825 case TAG_class_type
:
2826 case TAG_structure_type
:
2827 case TAG_union_type
:
2828 case TAG_enumeration_type
:
2829 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2830 SYMBOL_NAMESPACE (sym
) = STRUCT_NAMESPACE
;
2831 add_symbol_to_list (sym
, list_in_scope
);
2834 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2835 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2836 add_symbol_to_list (sym
, list_in_scope
);
2839 /* Not a tag we recognize. Hopefully we aren't processing trash
2840 data, but since we must specifically ignore things we don't
2841 recognize, there is nothing else we should do at this point. */
2852 synthesize_typedef -- make a symbol table entry for a "fake" typedef
2856 static void synthesize_typedef (struct dieinfo *dip,
2857 struct objfile *objfile,
2862 Given a pointer to a DWARF information entry, synthesize a typedef
2863 for the name in the DIE, using the specified type.
2865 This is used for C++ class, structs, unions, and enumerations to
2866 set up the tag name as a type.
2871 synthesize_typedef (dip
, objfile
, type
)
2872 struct dieinfo
*dip
;
2873 struct objfile
*objfile
;
2876 struct symbol
*sym
= NULL
;
2878 if (dip
-> at_name
!= NULL
)
2880 sym
= (struct symbol
*)
2881 obstack_alloc (&objfile
-> symbol_obstack
, sizeof (struct symbol
));
2882 memset (sym
, 0, sizeof (struct symbol
));
2883 SYMBOL_NAME (sym
) = create_name (dip
-> at_name
,
2884 &objfile
->symbol_obstack
);
2885 SYMBOL_TYPE (sym
) = type
;
2886 SYMBOL_CLASS (sym
) = LOC_TYPEDEF
;
2887 SYMBOL_NAMESPACE (sym
) = VAR_NAMESPACE
;
2888 add_symbol_to_list (sym
, list_in_scope
);
2896 decode_mod_fund_type -- decode a modified fundamental type
2900 static struct type *decode_mod_fund_type (char *typedata)
2904 Decode a block of data containing a modified fundamental
2905 type specification. TYPEDATA is a pointer to the block,
2906 which starts with a length containing the size of the rest
2907 of the block. At the end of the block is a fundmental type
2908 code value that gives the fundamental type. Everything
2909 in between are type modifiers.
2911 We simply compute the number of modifiers and call the general
2912 function decode_modified_type to do the actual work.
2915 static struct type
*
2916 decode_mod_fund_type (typedata
)
2919 struct type
*typep
= NULL
;
2920 unsigned short modcount
;
2923 /* Get the total size of the block, exclusive of the size itself */
2925 nbytes
= attribute_size (AT_mod_fund_type
);
2926 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
2929 /* Deduct the size of the fundamental type bytes at the end of the block. */
2931 modcount
-= attribute_size (AT_fund_type
);
2933 /* Now do the actual decoding */
2935 typep
= decode_modified_type (typedata
, modcount
, AT_mod_fund_type
);
2943 decode_mod_u_d_type -- decode a modified user defined type
2947 static struct type *decode_mod_u_d_type (char *typedata)
2951 Decode a block of data containing a modified user defined
2952 type specification. TYPEDATA is a pointer to the block,
2953 which consists of a two byte length, containing the size
2954 of the rest of the block. At the end of the block is a
2955 four byte value that gives a reference to a user defined type.
2956 Everything in between are type modifiers.
2958 We simply compute the number of modifiers and call the general
2959 function decode_modified_type to do the actual work.
2962 static struct type
*
2963 decode_mod_u_d_type (typedata
)
2966 struct type
*typep
= NULL
;
2967 unsigned short modcount
;
2970 /* Get the total size of the block, exclusive of the size itself */
2972 nbytes
= attribute_size (AT_mod_u_d_type
);
2973 modcount
= target_to_host (typedata
, nbytes
, GET_UNSIGNED
, current_objfile
);
2976 /* Deduct the size of the reference type bytes at the end of the block. */
2978 modcount
-= attribute_size (AT_user_def_type
);
2980 /* Now do the actual decoding */
2982 typep
= decode_modified_type (typedata
, modcount
, AT_mod_u_d_type
);
2990 decode_modified_type -- decode modified user or fundamental type
2994 static struct type *decode_modified_type (char *modifiers,
2995 unsigned short modcount, int mtype)
2999 Decode a modified type, either a modified fundamental type or
3000 a modified user defined type. MODIFIERS is a pointer to the
3001 block of bytes that define MODCOUNT modifiers. Immediately
3002 following the last modifier is a short containing the fundamental
3003 type or a long containing the reference to the user defined
3004 type. Which one is determined by MTYPE, which is either
3005 AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
3006 type we are generating.
3008 We call ourself recursively to generate each modified type,`
3009 until MODCOUNT reaches zero, at which point we have consumed
3010 all the modifiers and generate either the fundamental type or
3011 user defined type. When the recursion unwinds, each modifier
3012 is applied in turn to generate the full modified type.
3016 If we find a modifier that we don't recognize, and it is not one
3017 of those reserved for application specific use, then we issue a
3018 warning and simply ignore the modifier.
3022 We currently ignore MOD_const and MOD_volatile. (FIXME)
3026 static struct type
*
3027 decode_modified_type (modifiers
, modcount
, mtype
)
3029 unsigned int modcount
;
3032 struct type
*typep
= NULL
;
3033 unsigned short fundtype
;
3042 case AT_mod_fund_type
:
3043 nbytes
= attribute_size (AT_fund_type
);
3044 fundtype
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3046 typep
= decode_fund_type (fundtype
);
3048 case AT_mod_u_d_type
:
3049 nbytes
= attribute_size (AT_user_def_type
);
3050 die_ref
= target_to_host (modifiers
, nbytes
, GET_UNSIGNED
,
3052 if ((typep
= lookup_utype (die_ref
)) == NULL
)
3054 typep
= alloc_utype (die_ref
, NULL
);
3058 SQUAWK (("botched modified type decoding (mtype 0x%x)", mtype
));
3059 typep
= lookup_fundamental_type (current_objfile
, FT_INTEGER
);
3065 modifier
= *modifiers
++;
3066 typep
= decode_modified_type (modifiers
, --modcount
, mtype
);
3069 case MOD_pointer_to
:
3070 typep
= lookup_pointer_type (typep
);
3072 case MOD_reference_to
:
3073 typep
= lookup_reference_type (typep
);
3076 SQUAWK (("type modifier 'const' ignored")); /* FIXME */
3079 SQUAWK (("type modifier 'volatile' ignored")); /* FIXME */
3082 if (!(MOD_lo_user
<= (unsigned char) modifier
3083 && (unsigned char) modifier
<= MOD_hi_user
))
3085 SQUAWK (("unknown type modifier %u",
3086 (unsigned char) modifier
));
3098 decode_fund_type -- translate basic DWARF type to gdb base type
3102 Given an integer that is one of the fundamental DWARF types,
3103 translate it to one of the basic internal gdb types and return
3104 a pointer to the appropriate gdb type (a "struct type *").
3108 If we encounter a fundamental type that we are unprepared to
3109 deal with, and it is not in the range of those types defined
3110 as application specific types, then we issue a warning and
3111 treat the type as an "int".
3114 static struct type
*
3115 decode_fund_type (fundtype
)
3116 unsigned int fundtype
;
3118 struct type
*typep
= NULL
;
3124 typep
= lookup_fundamental_type (current_objfile
, FT_VOID
);
3127 case FT_boolean
: /* Was FT_set in AT&T version */
3128 typep
= lookup_fundamental_type (current_objfile
, FT_BOOLEAN
);
3131 case FT_pointer
: /* (void *) */
3132 typep
= lookup_fundamental_type (current_objfile
, FT_VOID
);
3133 typep
= lookup_pointer_type (typep
);
3137 typep
= lookup_fundamental_type (current_objfile
, FT_CHAR
);
3140 case FT_signed_char
:
3141 typep
= lookup_fundamental_type (current_objfile
, FT_SIGNED_CHAR
);
3144 case FT_unsigned_char
:
3145 typep
= lookup_fundamental_type (current_objfile
, FT_UNSIGNED_CHAR
);
3149 typep
= lookup_fundamental_type (current_objfile
, FT_SHORT
);
3152 case FT_signed_short
:
3153 typep
= lookup_fundamental_type (current_objfile
, FT_SIGNED_SHORT
);
3156 case FT_unsigned_short
:
3157 typep
= lookup_fundamental_type (current_objfile
, FT_UNSIGNED_SHORT
);
3161 typep
= lookup_fundamental_type (current_objfile
, FT_INTEGER
);
3164 case FT_signed_integer
:
3165 typep
= lookup_fundamental_type (current_objfile
, FT_SIGNED_INTEGER
);
3168 case FT_unsigned_integer
:
3169 typep
= lookup_fundamental_type (current_objfile
, FT_UNSIGNED_INTEGER
);
3173 typep
= lookup_fundamental_type (current_objfile
, FT_LONG
);
3176 case FT_signed_long
:
3177 typep
= lookup_fundamental_type (current_objfile
, FT_SIGNED_LONG
);
3180 case FT_unsigned_long
:
3181 typep
= lookup_fundamental_type (current_objfile
, FT_UNSIGNED_LONG
);
3185 typep
= lookup_fundamental_type (current_objfile
, FT_LONG_LONG
);
3188 case FT_signed_long_long
:
3189 typep
= lookup_fundamental_type (current_objfile
, FT_SIGNED_LONG_LONG
);
3192 case FT_unsigned_long_long
:
3193 typep
= lookup_fundamental_type (current_objfile
, FT_UNSIGNED_LONG_LONG
);
3197 typep
= lookup_fundamental_type (current_objfile
, FT_FLOAT
);
3200 case FT_dbl_prec_float
:
3201 typep
= lookup_fundamental_type (current_objfile
, FT_DBL_PREC_FLOAT
);
3204 case FT_ext_prec_float
:
3205 typep
= lookup_fundamental_type (current_objfile
, FT_EXT_PREC_FLOAT
);
3209 typep
= lookup_fundamental_type (current_objfile
, FT_COMPLEX
);
3212 case FT_dbl_prec_complex
:
3213 typep
= lookup_fundamental_type (current_objfile
, FT_DBL_PREC_COMPLEX
);
3216 case FT_ext_prec_complex
:
3217 typep
= lookup_fundamental_type (current_objfile
, FT_EXT_PREC_COMPLEX
);
3222 if ((typep
== NULL
) && !(FT_lo_user
<= fundtype
&& fundtype
<= FT_hi_user
))
3224 SQUAWK (("unexpected fundamental type 0x%x", fundtype
));
3225 typep
= lookup_fundamental_type (current_objfile
, FT_VOID
);
3235 create_name -- allocate a fresh copy of a string on an obstack
3239 Given a pointer to a string and a pointer to an obstack, allocates
3240 a fresh copy of the string on the specified obstack.
3245 create_name (name
, obstackp
)
3247 struct obstack
*obstackp
;
3252 length
= strlen (name
) + 1;
3253 newname
= (char *) obstack_alloc (obstackp
, length
);
3254 strcpy (newname
, name
);
3262 basicdieinfo -- extract the minimal die info from raw die data
3266 void basicdieinfo (char *diep, struct dieinfo *dip,
3267 struct objfile *objfile)
3271 Given a pointer to raw DIE data, and a pointer to an instance of a
3272 die info structure, this function extracts the basic information
3273 from the DIE data required to continue processing this DIE, along
3274 with some bookkeeping information about the DIE.
3276 The information we absolutely must have includes the DIE tag,
3277 and the DIE length. If we need the sibling reference, then we
3278 will have to call completedieinfo() to process all the remaining
3281 Note that since there is no guarantee that the data is properly
3282 aligned in memory for the type of access required (indirection
3283 through anything other than a char pointer), and there is no
3284 guarantee that it is in the same byte order as the gdb host,
3285 we call a function which deals with both alignment and byte
3286 swapping issues. Possibly inefficient, but quite portable.
3288 We also take care of some other basic things at this point, such
3289 as ensuring that the instance of the die info structure starts
3290 out completely zero'd and that curdie is initialized for use
3291 in error reporting if we have a problem with the current die.
3295 All DIE's must have at least a valid length, thus the minimum
3296 DIE size is SIZEOF_DIE_LENGTH. In order to have a valid tag, the
3297 DIE size must be at least SIZEOF_DIE_TAG larger, otherwise they
3298 are forced to be TAG_padding DIES.
3300 Padding DIES must be at least SIZEOF_DIE_LENGTH in length, implying
3301 that if a padding DIE is used for alignment and the amount needed is
3302 less than SIZEOF_DIE_LENGTH, then the padding DIE has to be big
3303 enough to align to the next alignment boundry.
3305 We do some basic sanity checking here, such as verifying that the
3306 length of the die would not cause it to overrun the recorded end of
3307 the buffer holding the DIE info. If we find a DIE that is either
3308 too small or too large, we force it's length to zero which should
3309 cause the caller to take appropriate action.
3313 basicdieinfo (dip
, diep
, objfile
)
3314 struct dieinfo
*dip
;
3316 struct objfile
*objfile
;
3319 memset (dip
, 0, sizeof (struct dieinfo
));
3321 dip
-> die_ref
= dbroff
+ (diep
- dbbase
);
3322 dip
-> die_length
= target_to_host (diep
, SIZEOF_DIE_LENGTH
, GET_UNSIGNED
,
3324 if ((dip
-> die_length
< SIZEOF_DIE_LENGTH
) ||
3325 ((diep
+ dip
-> die_length
) > (dbbase
+ dbsize
)))
3327 dwarfwarn ("malformed DIE, bad length (%d bytes)", dip
-> die_length
);
3328 dip
-> die_length
= 0;
3330 else if (dip
-> die_length
< (SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
))
3332 dip
-> die_tag
= TAG_padding
;
3336 diep
+= SIZEOF_DIE_LENGTH
;
3337 dip
-> die_tag
= target_to_host (diep
, SIZEOF_DIE_TAG
, GET_UNSIGNED
,
3346 completedieinfo -- finish reading the information for a given DIE
3350 void completedieinfo (struct dieinfo *dip, struct objfile *objfile)
3354 Given a pointer to an already partially initialized die info structure,
3355 scan the raw DIE data and finish filling in the die info structure
3356 from the various attributes found.
3358 Note that since there is no guarantee that the data is properly
3359 aligned in memory for the type of access required (indirection
3360 through anything other than a char pointer), and there is no
3361 guarantee that it is in the same byte order as the gdb host,
3362 we call a function which deals with both alignment and byte
3363 swapping issues. Possibly inefficient, but quite portable.
3367 Each time we are called, we increment the diecount variable, which
3368 keeps an approximate count of the number of dies processed for
3369 each compilation unit. This information is presented to the user
3370 if the info_verbose flag is set.
3375 completedieinfo (dip
, objfile
)
3376 struct dieinfo
*dip
;
3377 struct objfile
*objfile
;
3379 char *diep
; /* Current pointer into raw DIE data */
3380 char *end
; /* Terminate DIE scan here */
3381 unsigned short attr
; /* Current attribute being scanned */
3382 unsigned short form
; /* Form of the attribute */
3383 int nbytes
; /* Size of next field to read */
3387 end
= diep
+ dip
-> die_length
;
3388 diep
+= SIZEOF_DIE_LENGTH
+ SIZEOF_DIE_TAG
;
3391 attr
= target_to_host (diep
, SIZEOF_ATTRIBUTE
, GET_UNSIGNED
, objfile
);
3392 diep
+= SIZEOF_ATTRIBUTE
;
3393 if ((nbytes
= attribute_size (attr
)) == -1)
3395 SQUAWK (("unknown attribute length, skipped remaining attributes"));;
3402 dip
-> at_fund_type
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3406 dip
-> at_ordering
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3410 dip
-> at_bit_offset
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3414 dip
-> at_sibling
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3418 dip
-> at_stmt_list
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3420 dip
-> has_at_stmt_list
= 1;
3423 dip
-> at_low_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3425 dip
-> at_low_pc
+= baseaddr
;
3426 dip
-> has_at_low_pc
= 1;
3429 dip
-> at_high_pc
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3431 dip
-> at_high_pc
+= baseaddr
;
3434 dip
-> at_language
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3437 case AT_user_def_type
:
3438 dip
-> at_user_def_type
= target_to_host (diep
, nbytes
,
3439 GET_UNSIGNED
, objfile
);
3442 dip
-> at_byte_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3444 dip
-> has_at_byte_size
= 1;
3447 dip
-> at_bit_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3451 dip
-> at_member
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3455 dip
-> at_discr
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3459 dip
-> at_location
= diep
;
3461 case AT_mod_fund_type
:
3462 dip
-> at_mod_fund_type
= diep
;
3464 case AT_subscr_data
:
3465 dip
-> at_subscr_data
= diep
;
3467 case AT_mod_u_d_type
:
3468 dip
-> at_mod_u_d_type
= diep
;
3470 case AT_element_list
:
3471 dip
-> at_element_list
= diep
;
3472 dip
-> short_element_list
= 0;
3474 case AT_short_element_list
:
3475 dip
-> at_element_list
= diep
;
3476 dip
-> short_element_list
= 1;
3478 case AT_discr_value
:
3479 dip
-> at_discr_value
= diep
;
3481 case AT_string_length
:
3482 dip
-> at_string_length
= diep
;
3485 dip
-> at_name
= diep
;
3488 /* For now, ignore any "hostname:" portion, since gdb doesn't
3489 know how to deal with it. (FIXME). */
3490 dip
-> at_comp_dir
= strrchr (diep
, ':');
3491 if (dip
-> at_comp_dir
!= NULL
)
3493 dip
-> at_comp_dir
++;
3497 dip
-> at_comp_dir
= diep
;
3501 dip
-> at_producer
= diep
;
3503 case AT_start_scope
:
3504 dip
-> at_start_scope
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3507 case AT_stride_size
:
3508 dip
-> at_stride_size
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3512 dip
-> at_src_info
= target_to_host (diep
, nbytes
, GET_UNSIGNED
,
3516 dip
-> at_prototyped
= diep
;
3519 /* Found an attribute that we are unprepared to handle. However
3520 it is specifically one of the design goals of DWARF that
3521 consumers should ignore unknown attributes. As long as the
3522 form is one that we recognize (so we know how to skip it),
3523 we can just ignore the unknown attribute. */
3526 form
= FORM_FROM_ATTR (attr
);
3540 diep
+= TARGET_FT_POINTER_SIZE (objfile
);
3543 diep
+= 2 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3546 diep
+= 4 + target_to_host (diep
, nbytes
, GET_UNSIGNED
, objfile
);
3549 diep
+= strlen (diep
) + 1;
3552 SQUAWK (("unknown attribute form (0x%x)", form
));
3553 SQUAWK (("unknown attribute length, skipped remaining attributes"));;
3564 target_to_host -- swap in target data to host
3568 target_to_host (char *from, int nbytes, int signextend,
3569 struct objfile *objfile)
3573 Given pointer to data in target format in FROM, a byte count for
3574 the size of the data in NBYTES, a flag indicating whether or not
3575 the data is signed in SIGNEXTEND, and a pointer to the current
3576 objfile in OBJFILE, convert the data to host format and return
3577 the converted value.
3581 FIXME: If we read data that is known to be signed, and expect to
3582 use it as signed data, then we need to explicitly sign extend the
3583 result until the bfd library is able to do this for us.
3587 static unsigned long
3588 target_to_host (from
, nbytes
, signextend
, objfile
)
3591 int signextend
; /* FIXME: Unused */
3592 struct objfile
*objfile
;
3594 unsigned long rtnval
;
3599 rtnval
= bfd_get_64 (objfile
-> obfd
, (bfd_byte
*) from
);
3602 rtnval
= bfd_get_32 (objfile
-> obfd
, (bfd_byte
*) from
);
3605 rtnval
= bfd_get_16 (objfile
-> obfd
, (bfd_byte
*) from
);
3608 rtnval
= bfd_get_8 (objfile
-> obfd
, (bfd_byte
*) from
);
3611 dwarfwarn ("no bfd support for %d byte data object", nbytes
);
3622 attribute_size -- compute size of data for a DWARF attribute
3626 static int attribute_size (unsigned int attr)
3630 Given a DWARF attribute in ATTR, compute the size of the first
3631 piece of data associated with this attribute and return that
3634 Returns -1 for unrecognized attributes.
3639 attribute_size (attr
)
3642 int nbytes
; /* Size of next data for this attribute */
3643 unsigned short form
; /* Form of the attribute */
3645 form
= FORM_FROM_ATTR (attr
);
3648 case FORM_STRING
: /* A variable length field is next */
3651 case FORM_DATA2
: /* Next 2 byte field is the data itself */
3652 case FORM_BLOCK2
: /* Next 2 byte field is a block length */
3655 case FORM_DATA4
: /* Next 4 byte field is the data itself */
3656 case FORM_BLOCK4
: /* Next 4 byte field is a block length */
3657 case FORM_REF
: /* Next 4 byte field is a DIE offset */
3660 case FORM_DATA8
: /* Next 8 byte field is the data itself */
3663 case FORM_ADDR
: /* Next field size is target sizeof(void *) */
3664 nbytes
= TARGET_FT_POINTER_SIZE (objfile
);
3667 SQUAWK (("unknown attribute form (0x%x)", form
));