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35f5886e | 1 | /* DWARF debugging format support for GDB. |
1ab3bf1b JG |
2 | Copyright (C) 1991, 1992 Free Software Foundation, Inc. |
3 | Written by Fred Fish at Cygnus Support. Portions based on dbxread.c, | |
35f5886e FF |
4 | mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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. */ | |
21 | ||
22 | /* | |
23 | ||
24 | FIXME: Figure out how to get the frame pointer register number in the | |
25 | execution environment of the target. Remove R_FP kludge | |
26 | ||
27 | FIXME: Add generation of dependencies list to partial symtab code. | |
28 | ||
29 | FIXME: Currently we ignore host/target byte ordering and integer size | |
30 | differences. Should remap data from external form to an internal form | |
31 | before trying to use it. | |
32 | ||
33 | FIXME: Resolve minor differences between what information we put in the | |
34 | partial symbol table and what dbxread puts in. For example, we don't yet | |
35 | put enum constants there. And dbxread seems to invent a lot of typedefs | |
36 | we never see. Use the new printpsym command to see the partial symbol table | |
37 | contents. | |
38 | ||
35f5886e FF |
39 | FIXME: Figure out a better way to tell gdb about the name of the function |
40 | contain the user's entry point (I.E. main()) | |
41 | ||
42 | FIXME: The current DWARF specification has a very strong bias towards | |
43 | machines with 32-bit integers, as it assumes that many attributes of the | |
44 | program (such as an address) will fit in such an integer. There are many | |
45 | references in the spec to things that are 2, 4, or 8 bytes long. Given that | |
46 | we will probably run into problems on machines where some of these assumptions | |
47 | are invalid (64-bit ints for example), we don't bother at this time to try to | |
48 | make this code more flexible and just use shorts, ints, and longs (and their | |
49 | sizes) where it seems appropriate. I.E. we use a short int to hold DWARF | |
50 | tags, and assume that the tag size in the file is the same as sizeof(short). | |
51 | ||
35f5886e FF |
52 | FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for |
53 | other things to work on, if you get bored. :-) | |
54 | ||
55 | */ | |
4d315a07 | 56 | |
d747e0af | 57 | #include "defs.h" |
313fdead | 58 | #include <varargs.h> |
35f5886e | 59 | #include <fcntl.h> |
84ffdec2 | 60 | #include <string.h> |
35f5886e | 61 | |
35f5886e FF |
62 | #include "bfd.h" |
63 | #include "symtab.h" | |
1ab3bf1b | 64 | #include "gdbtypes.h" |
35f5886e | 65 | #include "symfile.h" |
5e2e79f8 | 66 | #include "objfiles.h" |
84ffdec2 | 67 | #include "libbfd.h" /* FIXME Secret Internal BFD stuff (bfd_read) */ |
f5f0679a | 68 | #include "elf/dwarf.h" |
4d315a07 | 69 | #include "buildsym.h" |
35f5886e FF |
70 | |
71 | #ifdef MAINTENANCE /* Define to 1 to compile in some maintenance stuff */ | |
72 | #define SQUAWK(stuff) dwarfwarn stuff | |
73 | #else | |
74 | #define SQUAWK(stuff) | |
75 | #endif | |
76 | ||
77 | #ifndef R_FP /* FIXME */ | |
78 | #define R_FP 14 /* Kludge to get frame pointer register number */ | |
79 | #endif | |
80 | ||
81 | typedef unsigned int DIEREF; /* Reference to a DIE */ | |
82 | ||
4d315a07 FF |
83 | #ifndef GCC_PRODUCER |
84 | #define GCC_PRODUCER "GNU C " | |
85 | #endif | |
35f5886e FF |
86 | |
87 | #define STREQ(a,b) (strcmp(a,b)==0) | |
4d315a07 | 88 | #define STREQN(a,b,n) (strncmp(a,b,n)==0) |
35f5886e | 89 | |
768be6e1 FF |
90 | /* The Amiga SVR4 header file <dwarf.h> defines AT_element_list as a |
91 | FORM_BLOCK2, and this is the value emitted by the AT&T compiler. | |
92 | However, the Issue 2 DWARF specification from AT&T defines it as | |
93 | a FORM_BLOCK4, as does the latest specification from UI/PLSIG. | |
94 | For backwards compatibility with the AT&T compiler produced executables | |
95 | we define AT_short_element_list for this variant. */ | |
96 | ||
97 | #define AT_short_element_list (0x00f0|FORM_BLOCK2) | |
98 | ||
99 | /* External variables referenced. */ | |
100 | ||
35f5886e | 101 | extern int info_verbose; /* From main.c; nonzero => verbose */ |
318bf84f | 102 | extern char *warning_pre_print; /* From utils.c */ |
35f5886e FF |
103 | |
104 | /* The DWARF debugging information consists of two major pieces, | |
105 | one is a block of DWARF Information Entries (DIE's) and the other | |
106 | is a line number table. The "struct dieinfo" structure contains | |
107 | the information for a single DIE, the one currently being processed. | |
108 | ||
109 | In order to make it easier to randomly access the attribute fields | |
110 | of the current DIE, which are specifically unordered within the DIE | |
111 | each DIE is scanned and an instance of the "struct dieinfo" | |
112 | structure is initialized. | |
113 | ||
114 | Initialization is done in two levels. The first, done by basicdieinfo(), | |
115 | just initializes those fields that are vital to deciding whether or not | |
116 | to use this DIE, how to skip past it, etc. The second, done by the | |
117 | function completedieinfo(), fills in the rest of the information. | |
118 | ||
119 | Attributes which have block forms are not interpreted at the time | |
120 | the DIE is scanned, instead we just save pointers to the start | |
121 | of their value fields. | |
122 | ||
123 | Some fields have a flag <name>_p that is set when the value of the | |
124 | field is valid (I.E. we found a matching attribute in the DIE). Since | |
125 | we may want to test for the presence of some attributes in the DIE, | |
2d6186f4 | 126 | such as AT_low_pc, without restricting the values of the field, |
35f5886e FF |
127 | we need someway to note that we found such an attribute. |
128 | ||
129 | */ | |
130 | ||
131 | typedef char BLOCK; | |
132 | ||
133 | struct dieinfo { | |
134 | char * die; /* Pointer to the raw DIE data */ | |
135 | long dielength; /* Length of the raw DIE data */ | |
136 | DIEREF dieref; /* Offset of this DIE */ | |
137 | short dietag; /* Tag for this DIE */ | |
138 | long at_padding; | |
139 | long at_sibling; | |
140 | BLOCK * at_location; | |
141 | char * at_name; | |
142 | unsigned short at_fund_type; | |
143 | BLOCK * at_mod_fund_type; | |
144 | long at_user_def_type; | |
145 | BLOCK * at_mod_u_d_type; | |
146 | short at_ordering; | |
147 | BLOCK * at_subscr_data; | |
148 | long at_byte_size; | |
149 | short at_bit_offset; | |
150 | long at_bit_size; | |
35f5886e FF |
151 | BLOCK * at_element_list; |
152 | long at_stmt_list; | |
153 | long at_low_pc; | |
154 | long at_high_pc; | |
155 | long at_language; | |
156 | long at_member; | |
157 | long at_discr; | |
158 | BLOCK * at_discr_value; | |
159 | short at_visibility; | |
160 | long at_import; | |
161 | BLOCK * at_string_length; | |
162 | char * at_comp_dir; | |
163 | char * at_producer; | |
35f5886e | 164 | long at_frame_base; |
35f5886e FF |
165 | long at_start_scope; |
166 | long at_stride_size; | |
167 | long at_src_info; | |
168 | short at_prototyped; | |
2d6186f4 FF |
169 | unsigned int has_at_low_pc:1; |
170 | unsigned int has_at_stmt_list:1; | |
768be6e1 | 171 | unsigned int short_element_list:1; |
35f5886e FF |
172 | }; |
173 | ||
174 | static int diecount; /* Approximate count of dies for compilation unit */ | |
175 | static struct dieinfo *curdie; /* For warnings and such */ | |
176 | ||
177 | static char *dbbase; /* Base pointer to dwarf info */ | |
178 | static int dbroff; /* Relative offset from start of .debug section */ | |
179 | static char *lnbase; /* Base pointer to line section */ | |
180 | static int isreg; /* Kludge to identify register variables */ | |
a5bd5ba6 | 181 | static int offreg; /* Kludge to identify basereg references */ |
35f5886e FF |
182 | |
183 | static CORE_ADDR baseaddr; /* Add to each symbol value */ | |
184 | ||
185 | /* Each partial symbol table entry contains a pointer to private data for the | |
186 | read_symtab() function to use when expanding a partial symbol table entry | |
187 | to a full symbol table entry. For DWARF debugging info, this data is | |
188 | contained in the following structure and macros are provided for easy | |
189 | access to the members given a pointer to a partial symbol table entry. | |
190 | ||
191 | dbfoff Always the absolute file offset to the start of the ".debug" | |
192 | section for the file containing the DIE's being accessed. | |
193 | ||
194 | dbroff Relative offset from the start of the ".debug" access to the | |
195 | first DIE to be accessed. When building the partial symbol | |
196 | table, this value will be zero since we are accessing the | |
197 | entire ".debug" section. When expanding a partial symbol | |
198 | table entry, this value will be the offset to the first | |
199 | DIE for the compilation unit containing the symbol that | |
200 | triggers the expansion. | |
201 | ||
202 | dblength The size of the chunk of DIE's being examined, in bytes. | |
203 | ||
204 | lnfoff The absolute file offset to the line table fragment. Ignored | |
205 | when building partial symbol tables, but used when expanding | |
206 | them, and contains the absolute file offset to the fragment | |
207 | of the ".line" section containing the line numbers for the | |
208 | current compilation unit. | |
209 | */ | |
210 | ||
211 | struct dwfinfo { | |
212 | int dbfoff; /* Absolute file offset to start of .debug section */ | |
213 | int dbroff; /* Relative offset from start of .debug section */ | |
214 | int dblength; /* Size of the chunk of DIE's being examined */ | |
215 | int lnfoff; /* Absolute file offset to line table fragment */ | |
216 | }; | |
217 | ||
218 | #define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff) | |
219 | #define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff) | |
220 | #define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength) | |
221 | #define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff) | |
222 | ||
4d315a07 FF |
223 | /* The generic symbol table building routines have separate lists for |
224 | file scope symbols and all all other scopes (local scopes). So | |
225 | we need to select the right one to pass to add_symbol_to_list(). | |
226 | We do it by keeping a pointer to the correct list in list_in_scope. | |
35f5886e | 227 | |
4d315a07 FF |
228 | FIXME: The original dwarf code just treated the file scope as the first |
229 | local scope, and all other local scopes as nested local scopes, and worked | |
230 | fine. Check to see if we really need to distinguish these in buildsym.c */ | |
35f5886e | 231 | |
99140c31 | 232 | struct pending **list_in_scope = &file_symbols; |
35f5886e FF |
233 | |
234 | /* DIES which have user defined types or modified user defined types refer to | |
235 | other DIES for the type information. Thus we need to associate the offset | |
236 | of a DIE for a user defined type with a pointer to the type information. | |
237 | ||
238 | Originally this was done using a simple but expensive algorithm, with an | |
239 | array of unsorted structures, each containing an offset/type-pointer pair. | |
240 | This array was scanned linearly each time a lookup was done. The result | |
241 | was that gdb was spending over half it's startup time munging through this | |
242 | array of pointers looking for a structure that had the right offset member. | |
243 | ||
244 | The second attempt used the same array of structures, but the array was | |
245 | sorted using qsort each time a new offset/type was recorded, and a binary | |
246 | search was used to find the type pointer for a given DIE offset. This was | |
247 | even slower, due to the overhead of sorting the array each time a new | |
248 | offset/type pair was entered. | |
249 | ||
250 | The third attempt uses a fixed size array of type pointers, indexed by a | |
251 | value derived from the DIE offset. Since the minimum DIE size is 4 bytes, | |
252 | we can divide any DIE offset by 4 to obtain a unique index into this fixed | |
253 | size array. Since each element is a 4 byte pointer, it takes exactly as | |
254 | much memory to hold this array as to hold the DWARF info for a given | |
255 | compilation unit. But it gets freed as soon as we are done with it. */ | |
256 | ||
257 | static struct type **utypes; /* Pointer to array of user type pointers */ | |
258 | static int numutypes; /* Max number of user type pointers */ | |
259 | ||
260 | /* Forward declarations of static functions so we don't have to worry | |
1ab3bf1b JG |
261 | about ordering within this file. */ |
262 | ||
263 | static void | |
264 | add_enum_psymbol PARAMS ((struct dieinfo *, struct objfile *)); | |
265 | ||
266 | static void | |
267 | read_file_scope PARAMS ((struct dieinfo *, char *, char *, struct objfile *)); | |
35f5886e | 268 | |
58050209 | 269 | static void |
1ab3bf1b | 270 | read_func_scope PARAMS ((struct dieinfo *, char *, char *, struct objfile *)); |
35f5886e FF |
271 | |
272 | static void | |
1ab3bf1b JG |
273 | read_lexical_block_scope PARAMS ((struct dieinfo *, char *, char *, |
274 | struct objfile *)); | |
35f5886e FF |
275 | |
276 | static void | |
1ab3bf1b | 277 | dwarfwarn (); |
4d315a07 | 278 | |
35f5886e | 279 | static void |
1ab3bf1b | 280 | scan_partial_symbols PARAMS ((char *, char *, struct objfile *)); |
35f5886e | 281 | |
35f5886e | 282 | static void |
1ab3bf1b JG |
283 | scan_compilation_units PARAMS ((char *, char *, char *, unsigned int, |
284 | unsigned int, struct objfile *)); | |
35f5886e FF |
285 | |
286 | static void | |
1ab3bf1b | 287 | add_partial_symbol PARAMS ((struct dieinfo *, struct objfile *)); |
35f5886e FF |
288 | |
289 | static void | |
1ab3bf1b | 290 | init_psymbol_list PARAMS ((struct objfile *, int)); |
35f5886e FF |
291 | |
292 | static void | |
1ab3bf1b | 293 | basicdieinfo PARAMS ((struct dieinfo *, char *)); |
35f5886e FF |
294 | |
295 | static void | |
1ab3bf1b JG |
296 | completedieinfo PARAMS ((struct dieinfo *)); |
297 | ||
298 | static void | |
299 | dwarf_psymtab_to_symtab PARAMS ((struct partial_symtab *)); | |
300 | ||
301 | static void | |
302 | psymtab_to_symtab_1 PARAMS ((struct partial_symtab *)); | |
35f5886e FF |
303 | |
304 | static struct symtab * | |
1ab3bf1b | 305 | read_ofile_symtab PARAMS ((struct partial_symtab *)); |
35f5886e FF |
306 | |
307 | static void | |
1ab3bf1b | 308 | process_dies PARAMS ((char *, char *, struct objfile *)); |
35f5886e FF |
309 | |
310 | static void | |
1ab3bf1b JG |
311 | read_structure_scope PARAMS ((struct dieinfo *, char *, char *, |
312 | struct objfile *)); | |
35f5886e FF |
313 | |
314 | static struct type * | |
84ffdec2 | 315 | decode_array_element_type PARAMS ((char *)); |
35f5886e FF |
316 | |
317 | static struct type * | |
1ab3bf1b | 318 | decode_subscr_data PARAMS ((char *, char *)); |
35f5886e FF |
319 | |
320 | static void | |
1ab3bf1b | 321 | dwarf_read_array_type PARAMS ((struct dieinfo *)); |
35f5886e | 322 | |
9e4c1921 | 323 | static void |
1ab3bf1b | 324 | read_tag_pointer_type PARAMS ((struct dieinfo *dip)); |
9e4c1921 | 325 | |
35f5886e | 326 | static void |
1ab3bf1b | 327 | read_subroutine_type PARAMS ((struct dieinfo *, char *, char *)); |
35f5886e FF |
328 | |
329 | static void | |
1ab3bf1b | 330 | read_enumeration PARAMS ((struct dieinfo *, char *, char *, struct objfile *)); |
35f5886e FF |
331 | |
332 | static struct type * | |
1ab3bf1b | 333 | struct_type PARAMS ((struct dieinfo *, char *, char *, struct objfile *)); |
35f5886e FF |
334 | |
335 | static struct type * | |
1ab3bf1b | 336 | enum_type PARAMS ((struct dieinfo *, struct objfile *)); |
35f5886e | 337 | |
35f5886e | 338 | static void |
1ab3bf1b | 339 | decode_line_numbers PARAMS ((char *)); |
35f5886e FF |
340 | |
341 | static struct type * | |
1ab3bf1b | 342 | decode_die_type PARAMS ((struct dieinfo *)); |
35f5886e FF |
343 | |
344 | static struct type * | |
1ab3bf1b | 345 | decode_mod_fund_type PARAMS ((char *)); |
35f5886e FF |
346 | |
347 | static struct type * | |
1ab3bf1b | 348 | decode_mod_u_d_type PARAMS ((char *)); |
35f5886e FF |
349 | |
350 | static struct type * | |
1ab3bf1b | 351 | decode_modified_type PARAMS ((unsigned char *, unsigned int, int)); |
35f5886e FF |
352 | |
353 | static struct type * | |
1ab3bf1b | 354 | decode_fund_type PARAMS ((unsigned int)); |
35f5886e FF |
355 | |
356 | static char * | |
1ab3bf1b | 357 | create_name PARAMS ((char *, struct obstack *)); |
35f5886e | 358 | |
35f5886e | 359 | static struct type * |
1ab3bf1b | 360 | lookup_utype PARAMS ((DIEREF)); |
35f5886e FF |
361 | |
362 | static struct type * | |
1ab3bf1b | 363 | alloc_utype PARAMS ((DIEREF, struct type *)); |
35f5886e FF |
364 | |
365 | static struct symbol * | |
1ab3bf1b | 366 | new_symbol PARAMS ((struct dieinfo *, struct objfile *)); |
35f5886e FF |
367 | |
368 | static int | |
1ab3bf1b | 369 | locval PARAMS ((char *)); |
35f5886e FF |
370 | |
371 | static void | |
1ab3bf1b JG |
372 | record_minimal_symbol PARAMS ((char *, CORE_ADDR, enum minimal_symbol_type, |
373 | struct objfile *)); | |
35f5886e FF |
374 | |
375 | /* | |
376 | ||
377 | GLOBAL FUNCTION | |
378 | ||
379 | dwarf_build_psymtabs -- build partial symtabs from DWARF debug info | |
380 | ||
381 | SYNOPSIS | |
382 | ||
383 | void dwarf_build_psymtabs (int desc, char *filename, CORE_ADDR addr, | |
384 | int mainline, unsigned int dbfoff, unsigned int dbsize, | |
a048c8f5 JG |
385 | unsigned int lnoffset, unsigned int lnsize, |
386 | struct objfile *objfile) | |
35f5886e FF |
387 | |
388 | DESCRIPTION | |
389 | ||
390 | This function is called upon to build partial symtabs from files | |
391 | containing DIE's (Dwarf Information Entries) and DWARF line numbers. | |
392 | ||
393 | It is passed a file descriptor for an open file containing the DIES | |
394 | and line number information, the corresponding filename for that | |
395 | file, a base address for relocating the symbols, a flag indicating | |
396 | whether or not this debugging information is from a "main symbol | |
397 | table" rather than a shared library or dynamically linked file, | |
398 | and file offset/size pairs for the DIE information and line number | |
399 | information. | |
400 | ||
401 | RETURNS | |
402 | ||
403 | No return value. | |
404 | ||
405 | */ | |
406 | ||
407 | void | |
1ab3bf1b JG |
408 | dwarf_build_psymtabs (desc, filename, addr, mainline, dbfoff, dbsize, |
409 | lnoffset, lnsize, objfile) | |
410 | int desc; | |
411 | char *filename; | |
412 | CORE_ADDR addr; | |
413 | int mainline; | |
414 | unsigned int dbfoff; | |
415 | unsigned int dbsize; | |
416 | unsigned int lnoffset; | |
417 | unsigned int lnsize; | |
418 | struct objfile *objfile; | |
35f5886e FF |
419 | { |
420 | struct cleanup *back_to; | |
421 | ||
422 | dbbase = xmalloc (dbsize); | |
423 | dbroff = 0; | |
424 | if ((lseek (desc, dbfoff, 0) != dbfoff) || | |
425 | (read (desc, dbbase, dbsize) != dbsize)) | |
426 | { | |
427 | free (dbbase); | |
428 | error ("can't read DWARF data from '%s'", filename); | |
429 | } | |
430 | back_to = make_cleanup (free, dbbase); | |
431 | ||
432 | /* If we are reinitializing, or if we have never loaded syms yet, init. | |
433 | Since we have no idea how many DIES we are looking at, we just guess | |
434 | some arbitrary value. */ | |
435 | ||
1ab3bf1b | 436 | if (mainline || objfile->global_psymbols.size == 0 || objfile->static_psymbols.size == 0) |
35f5886e | 437 | { |
1ab3bf1b | 438 | init_psymbol_list (objfile, 1024); |
35f5886e FF |
439 | } |
440 | ||
84ffdec2 | 441 | /* Save the relocation factor where everybody can see it. */ |
f8b76e70 | 442 | |
84ffdec2 | 443 | baseaddr = addr; |
f8b76e70 | 444 | |
35f5886e FF |
445 | /* Follow the compilation unit sibling chain, building a partial symbol |
446 | table entry for each one. Save enough information about each compilation | |
447 | unit to locate the full DWARF information later. */ | |
448 | ||
4d315a07 | 449 | scan_compilation_units (filename, dbbase, dbbase + dbsize, |
a048c8f5 | 450 | dbfoff, lnoffset, objfile); |
35f5886e | 451 | |
35f5886e FF |
452 | do_cleanups (back_to); |
453 | } | |
454 | ||
455 | ||
456 | /* | |
457 | ||
458 | LOCAL FUNCTION | |
459 | ||
1ab3bf1b | 460 | record_minimal_symbol -- add entry to gdb's minimal symbol table |
35f5886e FF |
461 | |
462 | SYNOPSIS | |
463 | ||
1ab3bf1b JG |
464 | static void record_minimal_symbol (char *name, CORE_ADDR address, |
465 | enum minimal_symbol_type ms_type, | |
466 | struct objfile *objfile) | |
35f5886e FF |
467 | |
468 | DESCRIPTION | |
469 | ||
470 | Given a pointer to the name of a symbol that should be added to the | |
1ab3bf1b | 471 | minimal symbol table, and the address associated with that |
35f5886e | 472 | symbol, records this information for later use in building the |
1ab3bf1b | 473 | minimal symbol table. |
35f5886e | 474 | |
35f5886e FF |
475 | */ |
476 | ||
477 | static void | |
1ab3bf1b JG |
478 | record_minimal_symbol (name, address, ms_type, objfile) |
479 | char *name; | |
480 | CORE_ADDR address; | |
481 | enum minimal_symbol_type ms_type; | |
482 | struct objfile *objfile; | |
35f5886e | 483 | { |
1ab3bf1b JG |
484 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); |
485 | prim_record_minimal_symbol (name, address, ms_type); | |
35f5886e FF |
486 | } |
487 | ||
488 | /* | |
489 | ||
490 | LOCAL FUNCTION | |
491 | ||
492 | dwarfwarn -- issue a DWARF related warning | |
493 | ||
494 | DESCRIPTION | |
495 | ||
496 | Issue warnings about DWARF related things that aren't serious enough | |
497 | to warrant aborting with an error, but should not be ignored either. | |
498 | This includes things like detectable corruption in DIE's, missing | |
499 | DIE's, unimplemented features, etc. | |
500 | ||
501 | In general, running across tags or attributes that we don't recognize | |
502 | is not considered to be a problem and we should not issue warnings | |
503 | about such. | |
504 | ||
505 | NOTES | |
506 | ||
507 | We mostly follow the example of the error() routine, but without | |
508 | returning to command level. It is arguable about whether warnings | |
509 | should be issued at all, and if so, where they should go (stdout or | |
510 | stderr). | |
511 | ||
512 | We assume that curdie is valid and contains at least the basic | |
513 | information for the DIE where the problem was noticed. | |
514 | */ | |
515 | ||
516 | static void | |
313fdead JG |
517 | dwarfwarn (va_alist) |
518 | va_dcl | |
35f5886e FF |
519 | { |
520 | va_list ap; | |
313fdead | 521 | char *fmt; |
35f5886e | 522 | |
313fdead JG |
523 | va_start (ap); |
524 | fmt = va_arg (ap, char *); | |
35f5886e | 525 | warning_setup (); |
318bf84f | 526 | fprintf (stderr, "warning: DWARF ref 0x%x: ", curdie -> dieref); |
35f5886e FF |
527 | if (curdie -> at_name) |
528 | { | |
529 | fprintf (stderr, "'%s': ", curdie -> at_name); | |
530 | } | |
531 | vfprintf (stderr, fmt, ap); | |
532 | fprintf (stderr, "\n"); | |
533 | fflush (stderr); | |
534 | va_end (ap); | |
535 | } | |
4d315a07 | 536 | |
35f5886e FF |
537 | /* |
538 | ||
539 | LOCAL FUNCTION | |
540 | ||
541 | read_lexical_block_scope -- process all dies in a lexical block | |
542 | ||
543 | SYNOPSIS | |
544 | ||
545 | static void read_lexical_block_scope (struct dieinfo *dip, | |
546 | char *thisdie, char *enddie) | |
547 | ||
548 | DESCRIPTION | |
549 | ||
550 | Process all the DIES contained within a lexical block scope. | |
551 | Start a new scope, process the dies, and then close the scope. | |
552 | ||
553 | */ | |
554 | ||
555 | static void | |
1ab3bf1b JG |
556 | read_lexical_block_scope (dip, thisdie, enddie, objfile) |
557 | struct dieinfo *dip; | |
558 | char *thisdie; | |
559 | char *enddie; | |
560 | struct objfile *objfile; | |
35f5886e | 561 | { |
4d315a07 FF |
562 | register struct context_stack *new; |
563 | ||
564 | (void) push_context (0, dip -> at_low_pc); | |
a048c8f5 | 565 | process_dies (thisdie + dip -> dielength, enddie, objfile); |
4d315a07 FF |
566 | new = pop_context (); |
567 | if (local_symbols != NULL) | |
568 | { | |
569 | finish_block (0, &local_symbols, new -> old_blocks, new -> start_addr, | |
1ab3bf1b | 570 | dip -> at_high_pc, objfile); |
4d315a07 FF |
571 | } |
572 | local_symbols = new -> locals; | |
35f5886e FF |
573 | } |
574 | ||
575 | /* | |
576 | ||
577 | LOCAL FUNCTION | |
578 | ||
579 | lookup_utype -- look up a user defined type from die reference | |
580 | ||
581 | SYNOPSIS | |
582 | ||
583 | static type *lookup_utype (DIEREF dieref) | |
584 | ||
585 | DESCRIPTION | |
586 | ||
587 | Given a DIE reference, lookup the user defined type associated with | |
588 | that DIE, if it has been registered already. If not registered, then | |
589 | return NULL. Alloc_utype() can be called to register an empty | |
590 | type for this reference, which will be filled in later when the | |
591 | actual referenced DIE is processed. | |
592 | */ | |
593 | ||
594 | static struct type * | |
1ab3bf1b JG |
595 | lookup_utype (dieref) |
596 | DIEREF dieref; | |
35f5886e FF |
597 | { |
598 | struct type *type = NULL; | |
599 | int utypeidx; | |
600 | ||
601 | utypeidx = (dieref - dbroff) / 4; | |
602 | if ((utypeidx < 0) || (utypeidx >= numutypes)) | |
603 | { | |
604 | dwarfwarn ("reference to DIE (0x%x) outside compilation unit", dieref); | |
605 | } | |
606 | else | |
607 | { | |
608 | type = *(utypes + utypeidx); | |
609 | } | |
610 | return (type); | |
611 | } | |
612 | ||
613 | ||
614 | /* | |
615 | ||
616 | LOCAL FUNCTION | |
617 | ||
618 | alloc_utype -- add a user defined type for die reference | |
619 | ||
620 | SYNOPSIS | |
621 | ||
622 | static type *alloc_utype (DIEREF dieref, struct type *utypep) | |
623 | ||
624 | DESCRIPTION | |
625 | ||
626 | Given a die reference DIEREF, and a possible pointer to a user | |
627 | defined type UTYPEP, register that this reference has a user | |
628 | defined type and either use the specified type in UTYPEP or | |
629 | make a new empty type that will be filled in later. | |
630 | ||
631 | We should only be called after calling lookup_utype() to verify that | |
632 | there is not currently a type registered for DIEREF. | |
633 | */ | |
634 | ||
635 | static struct type * | |
1ab3bf1b JG |
636 | alloc_utype (dieref, utypep) |
637 | DIEREF dieref; | |
638 | struct type *utypep; | |
35f5886e FF |
639 | { |
640 | struct type **typep; | |
641 | int utypeidx; | |
642 | ||
643 | utypeidx = (dieref - dbroff) / 4; | |
644 | typep = utypes + utypeidx; | |
645 | if ((utypeidx < 0) || (utypeidx >= numutypes)) | |
646 | { | |
1ab3bf1b | 647 | utypep = lookup_fundamental_type (current_objfile, FT_INTEGER); |
35f5886e FF |
648 | dwarfwarn ("reference to DIE (0x%x) outside compilation unit", dieref); |
649 | } | |
650 | else if (*typep != NULL) | |
651 | { | |
652 | utypep = *typep; | |
653 | SQUAWK (("internal error: dup user type allocation")); | |
654 | } | |
655 | else | |
656 | { | |
657 | if (utypep == NULL) | |
658 | { | |
659 | utypep = (struct type *) | |
1ab3bf1b JG |
660 | obstack_alloc (¤t_objfile -> type_obstack, |
661 | sizeof (struct type)); | |
35f5886e | 662 | (void) memset (utypep, 0, sizeof (struct type)); |
1ab3bf1b | 663 | TYPE_OBJFILE (utypep) = current_objfile; |
35f5886e FF |
664 | } |
665 | *typep = utypep; | |
666 | } | |
667 | return (utypep); | |
668 | } | |
669 | ||
670 | /* | |
671 | ||
672 | LOCAL FUNCTION | |
673 | ||
674 | decode_die_type -- return a type for a specified die | |
675 | ||
676 | SYNOPSIS | |
677 | ||
678 | static struct type *decode_die_type (struct dieinfo *dip) | |
679 | ||
680 | DESCRIPTION | |
681 | ||
682 | Given a pointer to a die information structure DIP, decode the | |
683 | type of the die and return a pointer to the decoded type. All | |
684 | dies without specific types default to type int. | |
685 | */ | |
686 | ||
687 | static struct type * | |
1ab3bf1b JG |
688 | decode_die_type (dip) |
689 | struct dieinfo *dip; | |
35f5886e FF |
690 | { |
691 | struct type *type = NULL; | |
692 | ||
693 | if (dip -> at_fund_type != 0) | |
694 | { | |
695 | type = decode_fund_type (dip -> at_fund_type); | |
696 | } | |
697 | else if (dip -> at_mod_fund_type != NULL) | |
698 | { | |
699 | type = decode_mod_fund_type (dip -> at_mod_fund_type); | |
700 | } | |
701 | else if (dip -> at_user_def_type) | |
702 | { | |
703 | if ((type = lookup_utype (dip -> at_user_def_type)) == NULL) | |
704 | { | |
705 | type = alloc_utype (dip -> at_user_def_type, NULL); | |
706 | } | |
707 | } | |
708 | else if (dip -> at_mod_u_d_type) | |
709 | { | |
710 | type = decode_mod_u_d_type (dip -> at_mod_u_d_type); | |
711 | } | |
712 | else | |
713 | { | |
1ab3bf1b | 714 | type = lookup_fundamental_type (current_objfile, FT_INTEGER); |
35f5886e FF |
715 | } |
716 | return (type); | |
717 | } | |
718 | ||
719 | /* | |
720 | ||
721 | LOCAL FUNCTION | |
722 | ||
723 | struct_type -- compute and return the type for a struct or union | |
724 | ||
725 | SYNOPSIS | |
726 | ||
727 | static struct type *struct_type (struct dieinfo *dip, char *thisdie, | |
8b5b6fae | 728 | char *enddie, struct objfile *objfile) |
35f5886e FF |
729 | |
730 | DESCRIPTION | |
731 | ||
732 | Given pointer to a die information structure for a die which | |
715cafcb FF |
733 | defines a union or structure (and MUST define one or the other), |
734 | and pointers to the raw die data that define the range of dies which | |
735 | define the members, compute and return the user defined type for the | |
736 | structure or union. | |
35f5886e FF |
737 | */ |
738 | ||
739 | static struct type * | |
1ab3bf1b JG |
740 | struct_type (dip, thisdie, enddie, objfile) |
741 | struct dieinfo *dip; | |
742 | char *thisdie; | |
743 | char *enddie; | |
744 | struct objfile *objfile; | |
35f5886e FF |
745 | { |
746 | struct type *type; | |
747 | struct nextfield { | |
748 | struct nextfield *next; | |
749 | struct field field; | |
750 | }; | |
751 | struct nextfield *list = NULL; | |
752 | struct nextfield *new; | |
753 | int nfields = 0; | |
754 | int n; | |
755 | char *tpart1; | |
35f5886e | 756 | struct dieinfo mbr; |
8b5b6fae | 757 | char *nextdie; |
35f5886e FF |
758 | |
759 | if ((type = lookup_utype (dip -> dieref)) == NULL) | |
760 | { | |
5edf98d7 | 761 | /* No forward references created an empty type, so install one now */ |
35f5886e FF |
762 | type = alloc_utype (dip -> dieref, NULL); |
763 | } | |
a3723a43 | 764 | INIT_CPLUS_SPECIFIC(type); |
715cafcb | 765 | switch (dip -> dietag) |
35f5886e | 766 | { |
715cafcb | 767 | case TAG_structure_type: |
5edf98d7 | 768 | TYPE_CODE (type) = TYPE_CODE_STRUCT; |
715cafcb FF |
769 | tpart1 = "struct"; |
770 | break; | |
771 | case TAG_union_type: | |
772 | TYPE_CODE (type) = TYPE_CODE_UNION; | |
773 | tpart1 = "union"; | |
774 | break; | |
775 | default: | |
776 | /* Should never happen */ | |
777 | TYPE_CODE (type) = TYPE_CODE_UNDEF; | |
778 | tpart1 = "???"; | |
779 | SQUAWK (("missing structure or union tag")); | |
780 | break; | |
35f5886e | 781 | } |
5edf98d7 FF |
782 | /* Some compilers try to be helpful by inventing "fake" names for |
783 | anonymous enums, structures, and unions, like "~0fake" or ".0fake". | |
784 | Thanks, but no thanks... */ | |
715cafcb FF |
785 | if (dip -> at_name != NULL |
786 | && *dip -> at_name != '~' | |
787 | && *dip -> at_name != '.') | |
35f5886e | 788 | { |
1ab3bf1b JG |
789 | TYPE_NAME (type) = obconcat (¤t_objfile -> type_obstack, |
790 | tpart1, " ", dip -> at_name); | |
35f5886e | 791 | } |
715cafcb | 792 | if (dip -> at_byte_size != 0) |
35f5886e | 793 | { |
35f5886e | 794 | TYPE_LENGTH (type) = dip -> at_byte_size; |
35f5886e | 795 | } |
35f5886e FF |
796 | thisdie += dip -> dielength; |
797 | while (thisdie < enddie) | |
798 | { | |
799 | basicdieinfo (&mbr, thisdie); | |
800 | completedieinfo (&mbr); | |
801 | if (mbr.dielength <= sizeof (long)) | |
802 | { | |
803 | break; | |
804 | } | |
8b5b6fae FF |
805 | else if (mbr.at_sibling != 0) |
806 | { | |
807 | nextdie = dbbase + mbr.at_sibling - dbroff; | |
808 | } | |
809 | else | |
810 | { | |
811 | nextdie = thisdie + mbr.dielength; | |
812 | } | |
35f5886e FF |
813 | switch (mbr.dietag) |
814 | { | |
815 | case TAG_member: | |
816 | /* Get space to record the next field's data. */ | |
817 | new = (struct nextfield *) alloca (sizeof (struct nextfield)); | |
818 | new -> next = list; | |
819 | list = new; | |
820 | /* Save the data. */ | |
821 | list -> field.name = savestring (mbr.at_name, strlen (mbr.at_name)); | |
822 | list -> field.type = decode_die_type (&mbr); | |
823 | list -> field.bitpos = 8 * locval (mbr.at_location); | |
824 | list -> field.bitsize = 0; | |
825 | nfields++; | |
826 | break; | |
827 | default: | |
8b5b6fae | 828 | process_dies (thisdie, nextdie, objfile); |
35f5886e FF |
829 | break; |
830 | } | |
8b5b6fae | 831 | thisdie = nextdie; |
35f5886e | 832 | } |
5edf98d7 FF |
833 | /* Now create the vector of fields, and record how big it is. We may |
834 | not even have any fields, if this DIE was generated due to a reference | |
835 | to an anonymous structure or union. In this case, TYPE_FLAG_STUB is | |
836 | set, which clues gdb in to the fact that it needs to search elsewhere | |
837 | for the full structure definition. */ | |
838 | if (nfields == 0) | |
35f5886e | 839 | { |
5edf98d7 FF |
840 | TYPE_FLAGS (type) |= TYPE_FLAG_STUB; |
841 | } | |
842 | else | |
843 | { | |
844 | TYPE_NFIELDS (type) = nfields; | |
845 | TYPE_FIELDS (type) = (struct field *) | |
1ab3bf1b JG |
846 | obstack_alloc (¤t_objfile -> type_obstack, |
847 | sizeof (struct field) * nfields); | |
5edf98d7 FF |
848 | /* Copy the saved-up fields into the field vector. */ |
849 | for (n = nfields; list; list = list -> next) | |
850 | { | |
851 | TYPE_FIELD (type, --n) = list -> field; | |
852 | } | |
853 | } | |
35f5886e FF |
854 | return (type); |
855 | } | |
856 | ||
857 | /* | |
858 | ||
859 | LOCAL FUNCTION | |
860 | ||
861 | read_structure_scope -- process all dies within struct or union | |
862 | ||
863 | SYNOPSIS | |
864 | ||
865 | static void read_structure_scope (struct dieinfo *dip, | |
8b5b6fae | 866 | char *thisdie, char *enddie, struct objfile *objfile) |
35f5886e FF |
867 | |
868 | DESCRIPTION | |
869 | ||
870 | Called when we find the DIE that starts a structure or union | |
871 | scope (definition) to process all dies that define the members | |
872 | of the structure or union. DIP is a pointer to the die info | |
873 | struct for the DIE that names the structure or union. | |
874 | ||
875 | NOTES | |
876 | ||
877 | Note that we need to call struct_type regardless of whether or not | |
84ce6717 FF |
878 | the DIE has an at_name attribute, since it might be an anonymous |
879 | structure or union. This gets the type entered into our set of | |
880 | user defined types. | |
881 | ||
882 | However, if the structure is incomplete (an opaque struct/union) | |
883 | then suppress creating a symbol table entry for it since gdb only | |
884 | wants to find the one with the complete definition. Note that if | |
885 | it is complete, we just call new_symbol, which does it's own | |
886 | checking about whether the struct/union is anonymous or not (and | |
887 | suppresses creating a symbol table entry itself). | |
888 | ||
35f5886e FF |
889 | */ |
890 | ||
891 | static void | |
1ab3bf1b JG |
892 | read_structure_scope (dip, thisdie, enddie, objfile) |
893 | struct dieinfo *dip; | |
894 | char *thisdie; | |
895 | char *enddie; | |
896 | struct objfile *objfile; | |
35f5886e FF |
897 | { |
898 | struct type *type; | |
899 | struct symbol *sym; | |
900 | ||
8b5b6fae | 901 | type = struct_type (dip, thisdie, enddie, objfile); |
84ce6717 | 902 | if (!(TYPE_FLAGS (type) & TYPE_FLAG_STUB)) |
35f5886e | 903 | { |
1ab3bf1b | 904 | if ((sym = new_symbol (dip, objfile)) != NULL) |
84ce6717 FF |
905 | { |
906 | SYMBOL_TYPE (sym) = type; | |
907 | } | |
35f5886e FF |
908 | } |
909 | } | |
910 | ||
911 | /* | |
912 | ||
913 | LOCAL FUNCTION | |
914 | ||
915 | decode_array_element_type -- decode type of the array elements | |
916 | ||
917 | SYNOPSIS | |
918 | ||
919 | static struct type *decode_array_element_type (char *scan, char *end) | |
920 | ||
921 | DESCRIPTION | |
922 | ||
923 | As the last step in decoding the array subscript information for an | |
924 | array DIE, we need to decode the type of the array elements. We are | |
925 | passed a pointer to this last part of the subscript information and | |
926 | must return the appropriate type. If the type attribute is not | |
927 | recognized, just warn about the problem and return type int. | |
928 | */ | |
929 | ||
930 | static struct type * | |
84ffdec2 | 931 | decode_array_element_type (scan) |
1ab3bf1b | 932 | char *scan; |
35f5886e FF |
933 | { |
934 | struct type *typep; | |
935 | short attribute; | |
936 | DIEREF dieref; | |
937 | unsigned short fundtype; | |
938 | ||
84ffdec2 | 939 | /* FIXME, does this confuse the host and target sizeof's? --gnu */ |
35f5886e FF |
940 | (void) memcpy (&attribute, scan, sizeof (short)); |
941 | scan += sizeof (short); | |
942 | switch (attribute) | |
943 | { | |
944 | case AT_fund_type: | |
945 | (void) memcpy (&fundtype, scan, sizeof (short)); | |
946 | typep = decode_fund_type (fundtype); | |
947 | break; | |
948 | case AT_mod_fund_type: | |
949 | typep = decode_mod_fund_type (scan); | |
950 | break; | |
951 | case AT_user_def_type: | |
952 | (void) memcpy (&dieref, scan, sizeof (DIEREF)); | |
953 | if ((typep = lookup_utype (dieref)) == NULL) | |
954 | { | |
955 | typep = alloc_utype (dieref, NULL); | |
956 | } | |
957 | break; | |
958 | case AT_mod_u_d_type: | |
959 | typep = decode_mod_u_d_type (scan); | |
960 | break; | |
961 | default: | |
962 | SQUAWK (("bad array element type attribute 0x%x", attribute)); | |
1ab3bf1b | 963 | typep = lookup_fundamental_type (current_objfile, FT_INTEGER); |
35f5886e FF |
964 | break; |
965 | } | |
966 | return (typep); | |
967 | } | |
968 | ||
969 | /* | |
970 | ||
971 | LOCAL FUNCTION | |
972 | ||
973 | decode_subscr_data -- decode array subscript and element type data | |
974 | ||
975 | SYNOPSIS | |
976 | ||
977 | static struct type *decode_subscr_data (char *scan, char *end) | |
978 | ||
979 | DESCRIPTION | |
980 | ||
981 | The array subscripts and the data type of the elements of an | |
982 | array are described by a list of data items, stored as a block | |
983 | of contiguous bytes. There is a data item describing each array | |
984 | dimension, and a final data item describing the element type. | |
985 | The data items are ordered the same as their appearance in the | |
986 | source (I.E. leftmost dimension first, next to leftmost second, | |
987 | etc). | |
988 | ||
989 | We are passed a pointer to the start of the block of bytes | |
990 | containing the data items, and a pointer to the first byte past | |
991 | the data. This function decodes the data and returns a type. | |
992 | ||
993 | BUGS | |
994 | FIXME: This code only implements the forms currently used | |
995 | by the AT&T and GNU C compilers. | |
996 | ||
997 | The end pointer is supplied for error checking, maybe we should | |
998 | use it for that... | |
999 | */ | |
1000 | ||
1001 | static struct type * | |
1ab3bf1b JG |
1002 | decode_subscr_data (scan, end) |
1003 | char *scan; | |
1004 | char *end; | |
35f5886e FF |
1005 | { |
1006 | struct type *typep = NULL; | |
1007 | struct type *nexttype; | |
1008 | int format; | |
1009 | short fundtype; | |
1010 | long lowbound; | |
1011 | long highbound; | |
1012 | ||
1013 | format = *scan++; | |
1014 | switch (format) | |
1015 | { | |
1016 | case FMT_ET: | |
84ffdec2 | 1017 | typep = decode_array_element_type (scan); |
35f5886e FF |
1018 | break; |
1019 | case FMT_FT_C_C: | |
1020 | (void) memcpy (&fundtype, scan, sizeof (short)); | |
1021 | scan += sizeof (short); | |
1022 | if (fundtype != FT_integer && fundtype != FT_signed_integer | |
1023 | && fundtype != FT_unsigned_integer) | |
1024 | { | |
1025 | SQUAWK (("array subscripts must be integral types, not type 0x%x", | |
1026 | fundtype)); | |
1027 | } | |
1028 | else | |
1029 | { | |
1030 | (void) memcpy (&lowbound, scan, sizeof (long)); | |
1031 | scan += sizeof (long); | |
1032 | (void) memcpy (&highbound, scan, sizeof (long)); | |
1033 | scan += sizeof (long); | |
1034 | nexttype = decode_subscr_data (scan, end); | |
1035 | if (nexttype != NULL) | |
1036 | { | |
1037 | typep = (struct type *) | |
1ab3bf1b JG |
1038 | obstack_alloc (¤t_objfile -> type_obstack, |
1039 | sizeof (struct type)); | |
35f5886e | 1040 | (void) memset (typep, 0, sizeof (struct type)); |
1ab3bf1b | 1041 | TYPE_OBJFILE (typep) = current_objfile; |
35f5886e FF |
1042 | TYPE_CODE (typep) = TYPE_CODE_ARRAY; |
1043 | TYPE_LENGTH (typep) = TYPE_LENGTH (nexttype); | |
1044 | TYPE_LENGTH (typep) *= lowbound + highbound + 1; | |
1045 | TYPE_TARGET_TYPE (typep) = nexttype; | |
1046 | } | |
1047 | } | |
1048 | break; | |
1049 | case FMT_FT_C_X: | |
1050 | case FMT_FT_X_C: | |
1051 | case FMT_FT_X_X: | |
1052 | case FMT_UT_C_C: | |
1053 | case FMT_UT_C_X: | |
1054 | case FMT_UT_X_C: | |
1055 | case FMT_UT_X_X: | |
1056 | SQUAWK (("array subscript format 0x%x not handled yet", format)); | |
1057 | break; | |
1058 | default: | |
1059 | SQUAWK (("unknown array subscript format %x", format)); | |
1060 | break; | |
1061 | } | |
1062 | return (typep); | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | ||
1067 | LOCAL FUNCTION | |
1068 | ||
4d315a07 | 1069 | dwarf_read_array_type -- read TAG_array_type DIE |
35f5886e FF |
1070 | |
1071 | SYNOPSIS | |
1072 | ||
4d315a07 | 1073 | static void dwarf_read_array_type (struct dieinfo *dip) |
35f5886e FF |
1074 | |
1075 | DESCRIPTION | |
1076 | ||
1077 | Extract all information from a TAG_array_type DIE and add to | |
1078 | the user defined type vector. | |
1079 | */ | |
1080 | ||
1081 | static void | |
1ab3bf1b JG |
1082 | dwarf_read_array_type (dip) |
1083 | struct dieinfo *dip; | |
35f5886e FF |
1084 | { |
1085 | struct type *type; | |
af213624 | 1086 | struct type *utype; |
35f5886e FF |
1087 | char *sub; |
1088 | char *subend; | |
1089 | short temp; | |
1090 | ||
1091 | if (dip -> at_ordering != ORD_row_major) | |
1092 | { | |
1093 | /* FIXME: Can gdb even handle column major arrays? */ | |
1094 | SQUAWK (("array not row major; not handled correctly")); | |
1095 | } | |
1096 | if ((sub = dip -> at_subscr_data) != NULL) | |
1097 | { | |
1098 | (void) memcpy (&temp, sub, sizeof (short)); | |
1099 | subend = sub + sizeof (short) + temp; | |
1100 | sub += sizeof (short); | |
1101 | type = decode_subscr_data (sub, subend); | |
1102 | if (type == NULL) | |
1103 | { | |
af213624 FF |
1104 | if ((utype = lookup_utype (dip -> dieref)) == NULL) |
1105 | { | |
1106 | utype = alloc_utype (dip -> dieref, NULL); | |
1107 | } | |
1108 | TYPE_CODE (utype) = TYPE_CODE_ARRAY; | |
1ab3bf1b JG |
1109 | TYPE_TARGET_TYPE (utype) = |
1110 | lookup_fundamental_type (current_objfile, FT_INTEGER); | |
af213624 | 1111 | TYPE_LENGTH (utype) = 1 * TYPE_LENGTH (TYPE_TARGET_TYPE (utype)); |
35f5886e FF |
1112 | } |
1113 | else | |
1114 | { | |
af213624 FF |
1115 | if ((utype = lookup_utype (dip -> dieref)) == NULL) |
1116 | { | |
1117 | (void) alloc_utype (dip -> dieref, type); | |
1118 | } | |
1119 | else | |
1120 | { | |
1121 | TYPE_CODE (utype) = TYPE_CODE_ARRAY; | |
1122 | TYPE_LENGTH (utype) = TYPE_LENGTH (type); | |
1123 | TYPE_TARGET_TYPE (utype) = TYPE_TARGET_TYPE (type); | |
1124 | } | |
35f5886e FF |
1125 | } |
1126 | } | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | ||
9e4c1921 FF |
1131 | LOCAL FUNCTION |
1132 | ||
1133 | read_tag_pointer_type -- read TAG_pointer_type DIE | |
1134 | ||
1135 | SYNOPSIS | |
1136 | ||
1137 | static void read_tag_pointer_type (struct dieinfo *dip) | |
1138 | ||
1139 | DESCRIPTION | |
1140 | ||
1141 | Extract all information from a TAG_pointer_type DIE and add to | |
1142 | the user defined type vector. | |
1143 | */ | |
1144 | ||
1145 | static void | |
1ab3bf1b JG |
1146 | read_tag_pointer_type (dip) |
1147 | struct dieinfo *dip; | |
9e4c1921 FF |
1148 | { |
1149 | struct type *type; | |
1150 | struct type *utype; | |
9e4c1921 FF |
1151 | |
1152 | type = decode_die_type (dip); | |
1153 | if ((utype = lookup_utype (dip -> dieref)) == NULL) | |
1154 | { | |
1155 | utype = lookup_pointer_type (type); | |
1156 | (void) alloc_utype (dip -> dieref, utype); | |
1157 | } | |
1158 | else | |
1159 | { | |
1160 | TYPE_TARGET_TYPE (utype) = type; | |
1161 | TYPE_POINTER_TYPE (type) = utype; | |
1162 | ||
1163 | /* We assume the machine has only one representation for pointers! */ | |
1164 | /* FIXME: This confuses host<->target data representations, and is a | |
1165 | poor assumption besides. */ | |
1166 | ||
1167 | TYPE_LENGTH (utype) = sizeof (char *); | |
1168 | TYPE_CODE (utype) = TYPE_CODE_PTR; | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | ||
35f5886e FF |
1174 | LOCAL FUNCTION |
1175 | ||
1176 | read_subroutine_type -- process TAG_subroutine_type dies | |
1177 | ||
1178 | SYNOPSIS | |
1179 | ||
1180 | static void read_subroutine_type (struct dieinfo *dip, char thisdie, | |
1181 | char *enddie) | |
1182 | ||
1183 | DESCRIPTION | |
1184 | ||
1185 | Handle DIES due to C code like: | |
1186 | ||
1187 | struct foo { | |
1188 | int (*funcp)(int a, long l); (Generates TAG_subroutine_type DIE) | |
1189 | int b; | |
1190 | }; | |
1191 | ||
1192 | NOTES | |
1193 | ||
1194 | The parameter DIES are currently ignored. See if gdb has a way to | |
1195 | include this info in it's type system, and decode them if so. Is | |
1196 | this what the type structure's "arg_types" field is for? (FIXME) | |
1197 | */ | |
1198 | ||
1199 | static void | |
1ab3bf1b JG |
1200 | read_subroutine_type (dip, thisdie, enddie) |
1201 | struct dieinfo *dip; | |
1202 | char *thisdie; | |
1203 | char *enddie; | |
35f5886e | 1204 | { |
af213624 FF |
1205 | struct type *type; /* Type that this function returns */ |
1206 | struct type *ftype; /* Function that returns above type */ | |
35f5886e | 1207 | |
af213624 FF |
1208 | /* Decode the type that this subroutine returns */ |
1209 | ||
35f5886e | 1210 | type = decode_die_type (dip); |
af213624 FF |
1211 | |
1212 | /* Check to see if we already have a partially constructed user | |
1213 | defined type for this DIE, from a forward reference. */ | |
1214 | ||
1215 | if ((ftype = lookup_utype (dip -> dieref)) == NULL) | |
1216 | { | |
1217 | /* This is the first reference to one of these types. Make | |
1218 | a new one and place it in the user defined types. */ | |
1219 | ftype = lookup_function_type (type); | |
1220 | (void) alloc_utype (dip -> dieref, ftype); | |
1221 | } | |
1222 | else | |
1223 | { | |
1224 | /* We have an existing partially constructed type, so bash it | |
1225 | into the correct type. */ | |
1226 | TYPE_TARGET_TYPE (ftype) = type; | |
1227 | TYPE_FUNCTION_TYPE (type) = ftype; | |
1228 | TYPE_LENGTH (ftype) = 1; | |
1229 | TYPE_CODE (ftype) = TYPE_CODE_FUNC; | |
1230 | } | |
35f5886e FF |
1231 | } |
1232 | ||
1233 | /* | |
1234 | ||
1235 | LOCAL FUNCTION | |
1236 | ||
1237 | read_enumeration -- process dies which define an enumeration | |
1238 | ||
1239 | SYNOPSIS | |
1240 | ||
1241 | static void read_enumeration (struct dieinfo *dip, char *thisdie, | |
1ab3bf1b | 1242 | char *enddie, struct objfile *objfile) |
35f5886e FF |
1243 | |
1244 | DESCRIPTION | |
1245 | ||
1246 | Given a pointer to a die which begins an enumeration, process all | |
1247 | the dies that define the members of the enumeration. | |
1248 | ||
1249 | NOTES | |
1250 | ||
1251 | Note that we need to call enum_type regardless of whether or not we | |
1252 | have a symbol, since we might have an enum without a tag name (thus | |
1253 | no symbol for the tagname). | |
1254 | */ | |
1255 | ||
1256 | static void | |
1ab3bf1b JG |
1257 | read_enumeration (dip, thisdie, enddie, objfile) |
1258 | struct dieinfo *dip; | |
1259 | char *thisdie; | |
1260 | char *enddie; | |
1261 | struct objfile *objfile; | |
35f5886e FF |
1262 | { |
1263 | struct type *type; | |
1264 | struct symbol *sym; | |
1265 | ||
1ab3bf1b JG |
1266 | type = enum_type (dip, objfile); |
1267 | if ((sym = new_symbol (dip, objfile)) != NULL) | |
35f5886e FF |
1268 | { |
1269 | SYMBOL_TYPE (sym) = type; | |
1270 | } | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | ||
1275 | LOCAL FUNCTION | |
1276 | ||
1277 | enum_type -- decode and return a type for an enumeration | |
1278 | ||
1279 | SYNOPSIS | |
1280 | ||
1ab3bf1b | 1281 | static type *enum_type (struct dieinfo *dip, struct objfile *objfile) |
35f5886e FF |
1282 | |
1283 | DESCRIPTION | |
1284 | ||
1285 | Given a pointer to a die information structure for the die which | |
1286 | starts an enumeration, process all the dies that define the members | |
1287 | of the enumeration and return a type pointer for the enumeration. | |
98618bf7 | 1288 | |
715cafcb FF |
1289 | At the same time, for each member of the enumeration, create a |
1290 | symbol for it with namespace VAR_NAMESPACE and class LOC_CONST, | |
1291 | and give it the type of the enumeration itself. | |
1292 | ||
1293 | NOTES | |
1294 | ||
98618bf7 FF |
1295 | Note that the DWARF specification explicitly mandates that enum |
1296 | constants occur in reverse order from the source program order, | |
1297 | for "consistency" and because this ordering is easier for many | |
1ab3bf1b | 1298 | compilers to generate. (Draft 6, sec 3.8.5, Enumeration type |
715cafcb FF |
1299 | Entries). Because gdb wants to see the enum members in program |
1300 | source order, we have to ensure that the order gets reversed while | |
98618bf7 | 1301 | we are processing them. |
35f5886e FF |
1302 | */ |
1303 | ||
1304 | static struct type * | |
1ab3bf1b JG |
1305 | enum_type (dip, objfile) |
1306 | struct dieinfo *dip; | |
1307 | struct objfile *objfile; | |
35f5886e FF |
1308 | { |
1309 | struct type *type; | |
1310 | struct nextfield { | |
1311 | struct nextfield *next; | |
1312 | struct field field; | |
1313 | }; | |
1314 | struct nextfield *list = NULL; | |
1315 | struct nextfield *new; | |
1316 | int nfields = 0; | |
1317 | int n; | |
35f5886e FF |
1318 | char *scan; |
1319 | char *listend; | |
768be6e1 FF |
1320 | long ltemp; |
1321 | short stemp; | |
715cafcb | 1322 | struct symbol *sym; |
35f5886e FF |
1323 | |
1324 | if ((type = lookup_utype (dip -> dieref)) == NULL) | |
1325 | { | |
84ce6717 | 1326 | /* No forward references created an empty type, so install one now */ |
35f5886e FF |
1327 | type = alloc_utype (dip -> dieref, NULL); |
1328 | } | |
1329 | TYPE_CODE (type) = TYPE_CODE_ENUM; | |
84ce6717 FF |
1330 | /* Some compilers try to be helpful by inventing "fake" names for |
1331 | anonymous enums, structures, and unions, like "~0fake" or ".0fake". | |
1332 | Thanks, but no thanks... */ | |
715cafcb FF |
1333 | if (dip -> at_name != NULL |
1334 | && *dip -> at_name != '~' | |
1335 | && *dip -> at_name != '.') | |
35f5886e | 1336 | { |
1ab3bf1b JG |
1337 | TYPE_NAME (type) = obconcat (¤t_objfile -> type_obstack, "enum", |
1338 | " ", dip -> at_name); | |
35f5886e | 1339 | } |
715cafcb | 1340 | if (dip -> at_byte_size != 0) |
35f5886e FF |
1341 | { |
1342 | TYPE_LENGTH (type) = dip -> at_byte_size; | |
35f5886e | 1343 | } |
35f5886e FF |
1344 | if ((scan = dip -> at_element_list) != NULL) |
1345 | { | |
768be6e1 FF |
1346 | if (dip -> short_element_list) |
1347 | { | |
1348 | (void) memcpy (&stemp, scan, sizeof (stemp)); | |
1349 | listend = scan + stemp + sizeof (stemp); | |
1350 | scan += sizeof (stemp); | |
1351 | } | |
1352 | else | |
1353 | { | |
1354 | (void) memcpy (<emp, scan, sizeof (ltemp)); | |
1355 | listend = scan + ltemp + sizeof (ltemp); | |
1356 | scan += sizeof (ltemp); | |
1357 | } | |
35f5886e FF |
1358 | while (scan < listend) |
1359 | { | |
1360 | new = (struct nextfield *) alloca (sizeof (struct nextfield)); | |
1361 | new -> next = list; | |
1362 | list = new; | |
1363 | list -> field.type = NULL; | |
1364 | list -> field.bitsize = 0; | |
1365 | (void) memcpy (&list -> field.bitpos, scan, sizeof (long)); | |
1366 | scan += sizeof (long); | |
1367 | list -> field.name = savestring (scan, strlen (scan)); | |
1368 | scan += strlen (scan) + 1; | |
1369 | nfields++; | |
715cafcb | 1370 | /* Handcraft a new symbol for this enum member. */ |
1ab3bf1b | 1371 | sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack, |
715cafcb FF |
1372 | sizeof (struct symbol)); |
1373 | (void) memset (sym, 0, sizeof (struct symbol)); | |
1ab3bf1b | 1374 | SYMBOL_NAME (sym) = create_name (list -> field.name, &objfile->symbol_obstack); |
715cafcb FF |
1375 | SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; |
1376 | SYMBOL_CLASS (sym) = LOC_CONST; | |
1377 | SYMBOL_TYPE (sym) = type; | |
1378 | SYMBOL_VALUE (sym) = list -> field.bitpos; | |
4d315a07 | 1379 | add_symbol_to_list (sym, list_in_scope); |
35f5886e | 1380 | } |
84ce6717 FF |
1381 | /* Now create the vector of fields, and record how big it is. This is |
1382 | where we reverse the order, by pulling the members of the list in | |
1383 | reverse order from how they were inserted. If we have no fields | |
1384 | (this is apparently possible in C++) then skip building a field | |
1385 | vector. */ | |
1386 | if (nfields > 0) | |
1387 | { | |
1388 | TYPE_NFIELDS (type) = nfields; | |
1389 | TYPE_FIELDS (type) = (struct field *) | |
1ab3bf1b | 1390 | obstack_alloc (&objfile->symbol_obstack, sizeof (struct field) * nfields); |
84ce6717 FF |
1391 | /* Copy the saved-up fields into the field vector. */ |
1392 | for (n = 0; (n < nfields) && (list != NULL); list = list -> next) | |
1393 | { | |
1394 | TYPE_FIELD (type, n++) = list -> field; | |
1395 | } | |
1396 | } | |
35f5886e | 1397 | } |
35f5886e FF |
1398 | return (type); |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | ||
1403 | LOCAL FUNCTION | |
1404 | ||
1405 | read_func_scope -- process all dies within a function scope | |
1406 | ||
35f5886e FF |
1407 | DESCRIPTION |
1408 | ||
1409 | Process all dies within a given function scope. We are passed | |
1410 | a die information structure pointer DIP for the die which | |
1411 | starts the function scope, and pointers into the raw die data | |
1412 | that define the dies within the function scope. | |
1413 | ||
1414 | For now, we ignore lexical block scopes within the function. | |
1415 | The problem is that AT&T cc does not define a DWARF lexical | |
1416 | block scope for the function itself, while gcc defines a | |
1417 | lexical block scope for the function. We need to think about | |
1418 | how to handle this difference, or if it is even a problem. | |
1419 | (FIXME) | |
1420 | */ | |
1421 | ||
1422 | static void | |
1ab3bf1b JG |
1423 | read_func_scope (dip, thisdie, enddie, objfile) |
1424 | struct dieinfo *dip; | |
1425 | char *thisdie; | |
1426 | char *enddie; | |
1427 | struct objfile *objfile; | |
35f5886e | 1428 | { |
4d315a07 | 1429 | register struct context_stack *new; |
35f5886e | 1430 | |
5e2e79f8 FF |
1431 | if (objfile -> ei.entry_point >= dip -> at_low_pc && |
1432 | objfile -> ei.entry_point < dip -> at_high_pc) | |
35f5886e | 1433 | { |
5e2e79f8 FF |
1434 | objfile -> ei.entry_func_lowpc = dip -> at_low_pc; |
1435 | objfile -> ei.entry_func_highpc = dip -> at_high_pc; | |
35f5886e | 1436 | } |
4d315a07 | 1437 | if (STREQ (dip -> at_name, "main")) /* FIXME: hardwired name */ |
35f5886e | 1438 | { |
5e2e79f8 FF |
1439 | objfile -> ei.main_func_lowpc = dip -> at_low_pc; |
1440 | objfile -> ei.main_func_highpc = dip -> at_high_pc; | |
35f5886e | 1441 | } |
4d315a07 | 1442 | new = push_context (0, dip -> at_low_pc); |
1ab3bf1b | 1443 | new -> name = new_symbol (dip, objfile); |
4d315a07 | 1444 | list_in_scope = &local_symbols; |
a048c8f5 | 1445 | process_dies (thisdie + dip -> dielength, enddie, objfile); |
4d315a07 FF |
1446 | new = pop_context (); |
1447 | /* Make a block for the local symbols within. */ | |
1448 | finish_block (new -> name, &local_symbols, new -> old_blocks, | |
1ab3bf1b | 1449 | new -> start_addr, dip -> at_high_pc, objfile); |
4d315a07 | 1450 | list_in_scope = &file_symbols; |
35f5886e FF |
1451 | } |
1452 | ||
1453 | /* | |
1454 | ||
1455 | LOCAL FUNCTION | |
1456 | ||
1457 | read_file_scope -- process all dies within a file scope | |
1458 | ||
35f5886e FF |
1459 | DESCRIPTION |
1460 | ||
1461 | Process all dies within a given file scope. We are passed a | |
1462 | pointer to the die information structure for the die which | |
1463 | starts the file scope, and pointers into the raw die data which | |
1464 | mark the range of dies within the file scope. | |
1465 | ||
1466 | When the partial symbol table is built, the file offset for the line | |
1467 | number table for each compilation unit is saved in the partial symbol | |
1468 | table entry for that compilation unit. As the symbols for each | |
1469 | compilation unit are read, the line number table is read into memory | |
1470 | and the variable lnbase is set to point to it. Thus all we have to | |
1471 | do is use lnbase to access the line number table for the current | |
1472 | compilation unit. | |
1473 | */ | |
1474 | ||
1475 | static void | |
1ab3bf1b JG |
1476 | read_file_scope (dip, thisdie, enddie, objfile) |
1477 | struct dieinfo *dip; | |
1478 | char *thisdie; | |
1479 | char *enddie; | |
1480 | struct objfile *objfile; | |
35f5886e FF |
1481 | { |
1482 | struct cleanup *back_to; | |
4d315a07 | 1483 | struct symtab *symtab; |
35f5886e | 1484 | |
5e2e79f8 FF |
1485 | if (objfile -> ei.entry_point >= dip -> at_low_pc && |
1486 | objfile -> ei.entry_point < dip -> at_high_pc) | |
35f5886e | 1487 | { |
5e2e79f8 FF |
1488 | objfile -> ei.entry_file_lowpc = dip -> at_low_pc; |
1489 | objfile -> ei.entry_file_highpc = dip -> at_high_pc; | |
35f5886e | 1490 | } |
4d315a07 FF |
1491 | if (dip -> at_producer != NULL) |
1492 | { | |
1493 | processing_gcc_compilation = | |
1494 | STREQN (dip -> at_producer, GCC_PRODUCER, strlen (GCC_PRODUCER)); | |
1495 | } | |
35f5886e FF |
1496 | numutypes = (enddie - thisdie) / 4; |
1497 | utypes = (struct type **) xmalloc (numutypes * sizeof (struct type *)); | |
1498 | back_to = make_cleanup (free, utypes); | |
1499 | (void) memset (utypes, 0, numutypes * sizeof (struct type *)); | |
4d315a07 | 1500 | start_symtab (dip -> at_name, NULL, dip -> at_low_pc); |
35f5886e | 1501 | decode_line_numbers (lnbase); |
a048c8f5 | 1502 | process_dies (thisdie + dip -> dielength, enddie, objfile); |
4d315a07 FF |
1503 | symtab = end_symtab (dip -> at_high_pc, 0, 0, objfile); |
1504 | /* FIXME: The following may need to be expanded for other languages */ | |
1505 | switch (dip -> at_language) | |
1506 | { | |
1507 | case LANG_C89: | |
1508 | case LANG_C: | |
1509 | symtab -> language = language_c; | |
1510 | break; | |
1511 | case LANG_C_PLUS_PLUS: | |
1512 | symtab -> language = language_cplus; | |
1513 | break; | |
1514 | default: | |
1515 | ; | |
1516 | } | |
35f5886e FF |
1517 | do_cleanups (back_to); |
1518 | utypes = NULL; | |
1519 | numutypes = 0; | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | ||
35f5886e FF |
1524 | LOCAL FUNCTION |
1525 | ||
1526 | process_dies -- process a range of DWARF Information Entries | |
1527 | ||
1528 | SYNOPSIS | |
1529 | ||
8b5b6fae FF |
1530 | static void process_dies (char *thisdie, char *enddie, |
1531 | struct objfile *objfile) | |
35f5886e FF |
1532 | |
1533 | DESCRIPTION | |
1534 | ||
1535 | Process all DIE's in a specified range. May be (and almost | |
1536 | certainly will be) called recursively. | |
1537 | */ | |
1538 | ||
1539 | static void | |
1ab3bf1b JG |
1540 | process_dies (thisdie, enddie, objfile) |
1541 | char *thisdie; | |
1542 | char *enddie; | |
1543 | struct objfile *objfile; | |
35f5886e FF |
1544 | { |
1545 | char *nextdie; | |
1546 | struct dieinfo di; | |
1547 | ||
1548 | while (thisdie < enddie) | |
1549 | { | |
1550 | basicdieinfo (&di, thisdie); | |
1551 | if (di.dielength < sizeof (long)) | |
1552 | { | |
1553 | break; | |
1554 | } | |
1555 | else if (di.dietag == TAG_padding) | |
1556 | { | |
1557 | nextdie = thisdie + di.dielength; | |
1558 | } | |
1559 | else | |
1560 | { | |
1561 | completedieinfo (&di); | |
1562 | if (di.at_sibling != 0) | |
1563 | { | |
1564 | nextdie = dbbase + di.at_sibling - dbroff; | |
1565 | } | |
1566 | else | |
1567 | { | |
1568 | nextdie = thisdie + di.dielength; | |
1569 | } | |
1570 | switch (di.dietag) | |
1571 | { | |
1572 | case TAG_compile_unit: | |
a048c8f5 | 1573 | read_file_scope (&di, thisdie, nextdie, objfile); |
35f5886e FF |
1574 | break; |
1575 | case TAG_global_subroutine: | |
1576 | case TAG_subroutine: | |
2d6186f4 | 1577 | if (di.has_at_low_pc) |
35f5886e | 1578 | { |
a048c8f5 | 1579 | read_func_scope (&di, thisdie, nextdie, objfile); |
35f5886e FF |
1580 | } |
1581 | break; | |
1582 | case TAG_lexical_block: | |
a048c8f5 | 1583 | read_lexical_block_scope (&di, thisdie, nextdie, objfile); |
35f5886e FF |
1584 | break; |
1585 | case TAG_structure_type: | |
1586 | case TAG_union_type: | |
8b5b6fae | 1587 | read_structure_scope (&di, thisdie, nextdie, objfile); |
35f5886e FF |
1588 | break; |
1589 | case TAG_enumeration_type: | |
1ab3bf1b | 1590 | read_enumeration (&di, thisdie, nextdie, objfile); |
35f5886e FF |
1591 | break; |
1592 | case TAG_subroutine_type: | |
1593 | read_subroutine_type (&di, thisdie, nextdie); | |
1594 | break; | |
1595 | case TAG_array_type: | |
4d315a07 | 1596 | dwarf_read_array_type (&di); |
35f5886e | 1597 | break; |
9e4c1921 FF |
1598 | case TAG_pointer_type: |
1599 | read_tag_pointer_type (&di); | |
1600 | break; | |
35f5886e | 1601 | default: |
1ab3bf1b | 1602 | (void) new_symbol (&di, objfile); |
35f5886e FF |
1603 | break; |
1604 | } | |
1605 | } | |
1606 | thisdie = nextdie; | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | /* | |
1611 | ||
35f5886e FF |
1612 | LOCAL FUNCTION |
1613 | ||
1614 | decode_line_numbers -- decode a line number table fragment | |
1615 | ||
1616 | SYNOPSIS | |
1617 | ||
1618 | static void decode_line_numbers (char *tblscan, char *tblend, | |
1619 | long length, long base, long line, long pc) | |
1620 | ||
1621 | DESCRIPTION | |
1622 | ||
1623 | Translate the DWARF line number information to gdb form. | |
1624 | ||
1625 | The ".line" section contains one or more line number tables, one for | |
1626 | each ".line" section from the objects that were linked. | |
1627 | ||
1628 | The AT_stmt_list attribute for each TAG_source_file entry in the | |
1629 | ".debug" section contains the offset into the ".line" section for the | |
1630 | start of the table for that file. | |
1631 | ||
1632 | The table itself has the following structure: | |
1633 | ||
1634 | <table length><base address><source statement entry> | |
1635 | 4 bytes 4 bytes 10 bytes | |
1636 | ||
1637 | The table length is the total size of the table, including the 4 bytes | |
1638 | for the length information. | |
1639 | ||
1640 | The base address is the address of the first instruction generated | |
1641 | for the source file. | |
1642 | ||
1643 | Each source statement entry has the following structure: | |
1644 | ||
1645 | <line number><statement position><address delta> | |
1646 | 4 bytes 2 bytes 4 bytes | |
1647 | ||
1648 | The line number is relative to the start of the file, starting with | |
1649 | line 1. | |
1650 | ||
1651 | The statement position either -1 (0xFFFF) or the number of characters | |
1652 | from the beginning of the line to the beginning of the statement. | |
1653 | ||
1654 | The address delta is the difference between the base address and | |
1655 | the address of the first instruction for the statement. | |
1656 | ||
1657 | Note that we must copy the bytes from the packed table to our local | |
1658 | variables before attempting to use them, to avoid alignment problems | |
1659 | on some machines, particularly RISC processors. | |
1660 | ||
1661 | BUGS | |
1662 | ||
1663 | Does gdb expect the line numbers to be sorted? They are now by | |
1664 | chance/luck, but are not required to be. (FIXME) | |
1665 | ||
1666 | The line with number 0 is unused, gdb apparently can discover the | |
1667 | span of the last line some other way. How? (FIXME) | |
1668 | */ | |
1669 | ||
1670 | static void | |
1ab3bf1b JG |
1671 | decode_line_numbers (linetable) |
1672 | char *linetable; | |
35f5886e FF |
1673 | { |
1674 | char *tblscan; | |
1675 | char *tblend; | |
1676 | long length; | |
1677 | long base; | |
1678 | long line; | |
1679 | long pc; | |
1680 | ||
1681 | if (linetable != NULL) | |
1682 | { | |
1683 | tblscan = tblend = linetable; | |
1684 | (void) memcpy (&length, tblscan, sizeof (long)); | |
1685 | tblscan += sizeof (long); | |
1686 | tblend += length; | |
1687 | (void) memcpy (&base, tblscan, sizeof (long)); | |
1688 | base += baseaddr; | |
1689 | tblscan += sizeof (long); | |
1690 | while (tblscan < tblend) | |
1691 | { | |
1692 | (void) memcpy (&line, tblscan, sizeof (long)); | |
1693 | tblscan += sizeof (long) + sizeof (short); | |
1694 | (void) memcpy (&pc, tblscan, sizeof (long)); | |
1695 | tblscan += sizeof (long); | |
1696 | pc += base; | |
1697 | if (line > 0) | |
1698 | { | |
4d315a07 | 1699 | record_line (current_subfile, line, pc); |
35f5886e FF |
1700 | } |
1701 | } | |
1702 | } | |
1703 | } | |
1704 | ||
1705 | /* | |
1706 | ||
35f5886e FF |
1707 | LOCAL FUNCTION |
1708 | ||
1709 | locval -- compute the value of a location attribute | |
1710 | ||
1711 | SYNOPSIS | |
1712 | ||
1713 | static int locval (char *loc) | |
1714 | ||
1715 | DESCRIPTION | |
1716 | ||
1717 | Given pointer to a string of bytes that define a location, compute | |
1718 | the location and return the value. | |
1719 | ||
1720 | When computing values involving the current value of the frame pointer, | |
1721 | the value zero is used, which results in a value relative to the frame | |
1722 | pointer, rather than the absolute value. This is what GDB wants | |
1723 | anyway. | |
1724 | ||
1725 | When the result is a register number, the global isreg flag is set, | |
1726 | otherwise it is cleared. This is a kludge until we figure out a better | |
1727 | way to handle the problem. Gdb's design does not mesh well with the | |
1728 | DWARF notion of a location computing interpreter, which is a shame | |
1729 | because the flexibility goes unused. | |
1730 | ||
1731 | NOTES | |
1732 | ||
1733 | Note that stack[0] is unused except as a default error return. | |
1734 | Note that stack overflow is not yet handled. | |
1735 | */ | |
1736 | ||
1737 | static int | |
1ab3bf1b JG |
1738 | locval (loc) |
1739 | char *loc; | |
35f5886e FF |
1740 | { |
1741 | unsigned short nbytes; | |
1742 | auto int stack[64]; | |
1743 | int stacki; | |
1744 | char *end; | |
1745 | long regno; | |
1746 | ||
1747 | (void) memcpy (&nbytes, loc, sizeof (short)); | |
1748 | end = loc + sizeof (short) + nbytes; | |
1749 | stacki = 0; | |
1750 | stack[stacki] = 0; | |
1751 | isreg = 0; | |
a5bd5ba6 | 1752 | offreg = 0; |
35f5886e FF |
1753 | for (loc += sizeof (short); loc < end; loc += sizeof (long)) |
1754 | { | |
1755 | switch (*loc++) { | |
1756 | case 0: | |
1757 | /* error */ | |
1758 | loc = end; | |
1759 | break; | |
1760 | case OP_REG: | |
1761 | /* push register (number) */ | |
1762 | (void) memcpy (&stack[++stacki], loc, sizeof (long)); | |
1763 | isreg = 1; | |
1764 | break; | |
1765 | case OP_BASEREG: | |
1766 | /* push value of register (number) */ | |
1767 | /* Actually, we compute the value as if register has 0 */ | |
a5bd5ba6 | 1768 | offreg = 1; |
35f5886e FF |
1769 | (void) memcpy (®no, loc, sizeof (long)); |
1770 | if (regno == R_FP) | |
1771 | { | |
1772 | stack[++stacki] = 0; | |
1773 | } | |
1774 | else | |
1775 | { | |
1776 | stack[++stacki] = 0; | |
1777 | SQUAWK (("BASEREG %d not handled!", regno)); | |
1778 | } | |
1779 | break; | |
1780 | case OP_ADDR: | |
1781 | /* push address (relocated address) */ | |
1782 | (void) memcpy (&stack[++stacki], loc, sizeof (long)); | |
1783 | break; | |
1784 | case OP_CONST: | |
1785 | /* push constant (number) */ | |
1786 | (void) memcpy (&stack[++stacki], loc, sizeof (long)); | |
1787 | break; | |
1788 | case OP_DEREF2: | |
1789 | /* pop, deref and push 2 bytes (as a long) */ | |
1790 | SQUAWK (("OP_DEREF2 address %#x not handled", stack[stacki])); | |
1791 | break; | |
1792 | case OP_DEREF4: /* pop, deref and push 4 bytes (as a long) */ | |
1793 | SQUAWK (("OP_DEREF4 address %#x not handled", stack[stacki])); | |
1794 | break; | |
1795 | case OP_ADD: /* pop top 2 items, add, push result */ | |
1796 | stack[stacki - 1] += stack[stacki]; | |
1797 | stacki--; | |
1798 | break; | |
1799 | } | |
1800 | } | |
1801 | return (stack[stacki]); | |
1802 | } | |
1803 | ||
1804 | /* | |
1805 | ||
1806 | LOCAL FUNCTION | |
1807 | ||
1808 | read_ofile_symtab -- build a full symtab entry from chunk of DIE's | |
1809 | ||
1810 | SYNOPSIS | |
1811 | ||
a048c8f5 | 1812 | static struct symtab *read_ofile_symtab (struct partial_symtab *pst) |
35f5886e FF |
1813 | |
1814 | DESCRIPTION | |
1815 | ||
1ab3bf1b JG |
1816 | When expanding a partial symbol table entry to a full symbol table |
1817 | entry, this is the function that gets called to read in the symbols | |
1818 | for the compilation unit. | |
1819 | ||
1820 | Returns a pointer to the newly constructed symtab (which is now | |
1821 | the new first one on the objfile's symtab list). | |
35f5886e FF |
1822 | */ |
1823 | ||
1824 | static struct symtab * | |
1ab3bf1b JG |
1825 | read_ofile_symtab (pst) |
1826 | struct partial_symtab *pst; | |
35f5886e FF |
1827 | { |
1828 | struct cleanup *back_to; | |
1829 | long lnsize; | |
1830 | int foffset; | |
1ab3bf1b JG |
1831 | bfd *abfd; |
1832 | ||
1833 | abfd = pst -> objfile -> obfd; | |
1834 | current_objfile = pst -> objfile; | |
1835 | ||
35f5886e FF |
1836 | /* Allocate a buffer for the entire chunk of DIE's for this compilation |
1837 | unit, seek to the location in the file, and read in all the DIE's. */ | |
1838 | ||
1839 | diecount = 0; | |
1840 | dbbase = xmalloc (DBLENGTH(pst)); | |
1841 | dbroff = DBROFF(pst); | |
1842 | foffset = DBFOFF(pst) + dbroff; | |
f8b76e70 | 1843 | baseaddr = pst -> addr; |
a048c8f5 JG |
1844 | if (bfd_seek (abfd, foffset, 0) || |
1845 | (bfd_read (dbbase, DBLENGTH(pst), 1, abfd) != DBLENGTH(pst))) | |
35f5886e FF |
1846 | { |
1847 | free (dbbase); | |
1848 | error ("can't read DWARF data"); | |
1849 | } | |
1850 | back_to = make_cleanup (free, dbbase); | |
1851 | ||
1852 | /* If there is a line number table associated with this compilation unit | |
1853 | then read the first long word from the line number table fragment, which | |
1854 | contains the size of the fragment in bytes (including the long word | |
1855 | itself). Allocate a buffer for the fragment and read it in for future | |
1856 | processing. */ | |
1857 | ||
1858 | lnbase = NULL; | |
1859 | if (LNFOFF (pst)) | |
1860 | { | |
a048c8f5 | 1861 | if (bfd_seek (abfd, LNFOFF (pst), 0) || |
84ffdec2 | 1862 | (bfd_read ((PTR)&lnsize, sizeof(long), 1, abfd) != sizeof(long))) |
35f5886e FF |
1863 | { |
1864 | error ("can't read DWARF line number table size"); | |
1865 | } | |
1866 | lnbase = xmalloc (lnsize); | |
a048c8f5 JG |
1867 | if (bfd_seek (abfd, LNFOFF (pst), 0) || |
1868 | (bfd_read (lnbase, lnsize, 1, abfd) != lnsize)) | |
35f5886e FF |
1869 | { |
1870 | free (lnbase); | |
1871 | error ("can't read DWARF line numbers"); | |
1872 | } | |
1873 | make_cleanup (free, lnbase); | |
1874 | } | |
1875 | ||
f8b76e70 | 1876 | process_dies (dbbase, dbbase + DBLENGTH(pst), pst -> objfile); |
35f5886e | 1877 | do_cleanups (back_to); |
1ab3bf1b JG |
1878 | current_objfile = NULL; |
1879 | return (pst -> objfile -> symtabs); | |
35f5886e FF |
1880 | } |
1881 | ||
1882 | /* | |
1883 | ||
1884 | LOCAL FUNCTION | |
1885 | ||
1886 | psymtab_to_symtab_1 -- do grunt work for building a full symtab entry | |
1887 | ||
1888 | SYNOPSIS | |
1889 | ||
a048c8f5 | 1890 | static void psymtab_to_symtab_1 (struct partial_symtab *pst) |
35f5886e FF |
1891 | |
1892 | DESCRIPTION | |
1893 | ||
1894 | Called once for each partial symbol table entry that needs to be | |
1895 | expanded into a full symbol table entry. | |
1896 | ||
1897 | */ | |
1898 | ||
1899 | static void | |
1ab3bf1b JG |
1900 | psymtab_to_symtab_1 (pst) |
1901 | struct partial_symtab *pst; | |
35f5886e FF |
1902 | { |
1903 | int i; | |
1904 | ||
1ab3bf1b | 1905 | if (pst != NULL) |
35f5886e | 1906 | { |
1ab3bf1b | 1907 | if (pst->readin) |
35f5886e | 1908 | { |
318bf84f | 1909 | warning ("psymtab for %s already read in. Shouldn't happen.", |
1ab3bf1b JG |
1910 | pst -> filename); |
1911 | } | |
1912 | else | |
1913 | { | |
1914 | /* Read in all partial symtabs on which this one is dependent */ | |
1915 | for (i = 0; i < pst -> number_of_dependencies; i++) | |
1916 | { | |
1917 | if (!pst -> dependencies[i] -> readin) | |
1918 | { | |
1919 | /* Inform about additional files that need to be read in. */ | |
1920 | if (info_verbose) | |
1921 | { | |
1922 | fputs_filtered (" ", stdout); | |
1923 | wrap_here (""); | |
1924 | fputs_filtered ("and ", stdout); | |
1925 | wrap_here (""); | |
1926 | printf_filtered ("%s...", | |
1927 | pst -> dependencies[i] -> filename); | |
1928 | wrap_here (""); | |
1929 | fflush (stdout); /* Flush output */ | |
1930 | } | |
1931 | psymtab_to_symtab_1 (pst -> dependencies[i]); | |
1932 | } | |
1933 | } | |
1934 | if (DBLENGTH (pst)) /* Otherwise it's a dummy */ | |
1935 | { | |
1936 | pst -> symtab = read_ofile_symtab (pst); | |
1937 | if (info_verbose) | |
1938 | { | |
1939 | printf_filtered ("%d DIE's, sorting...", diecount); | |
1940 | wrap_here (""); | |
1941 | fflush (stdout); | |
1942 | } | |
1943 | sort_symtab_syms (pst -> symtab); | |
1944 | } | |
1945 | pst -> readin = 1; | |
35f5886e | 1946 | } |
35f5886e | 1947 | } |
35f5886e FF |
1948 | } |
1949 | ||
1950 | /* | |
1951 | ||
1952 | LOCAL FUNCTION | |
1953 | ||
1954 | dwarf_psymtab_to_symtab -- build a full symtab entry from partial one | |
1955 | ||
1956 | SYNOPSIS | |
1957 | ||
1958 | static void dwarf_psymtab_to_symtab (struct partial_symtab *pst) | |
1959 | ||
1960 | DESCRIPTION | |
1961 | ||
1962 | This is the DWARF support entry point for building a full symbol | |
1963 | table entry from a partial symbol table entry. We are passed a | |
1964 | pointer to the partial symbol table entry that needs to be expanded. | |
1965 | ||
1966 | */ | |
1967 | ||
1968 | static void | |
1ab3bf1b JG |
1969 | dwarf_psymtab_to_symtab (pst) |
1970 | struct partial_symtab *pst; | |
35f5886e | 1971 | { |
7d9884b9 | 1972 | |
1ab3bf1b | 1973 | if (pst != NULL) |
35f5886e | 1974 | { |
1ab3bf1b | 1975 | if (pst -> readin) |
35f5886e | 1976 | { |
318bf84f | 1977 | warning ("psymtab for %s already read in. Shouldn't happen.", |
1ab3bf1b | 1978 | pst -> filename); |
35f5886e | 1979 | } |
1ab3bf1b | 1980 | else |
35f5886e | 1981 | { |
1ab3bf1b JG |
1982 | if (DBLENGTH (pst) || pst -> number_of_dependencies) |
1983 | { | |
1984 | /* Print the message now, before starting serious work, to avoid | |
1985 | disconcerting pauses. */ | |
1986 | if (info_verbose) | |
1987 | { | |
1988 | printf_filtered ("Reading in symbols for %s...", | |
1989 | pst -> filename); | |
1990 | fflush (stdout); | |
1991 | } | |
1992 | ||
1993 | psymtab_to_symtab_1 (pst); | |
1994 | ||
1995 | #if 0 /* FIXME: Check to see what dbxread is doing here and see if | |
1996 | we need to do an equivalent or is this something peculiar to | |
1997 | stabs/a.out format. | |
1998 | Match with global symbols. This only needs to be done once, | |
1999 | after all of the symtabs and dependencies have been read in. | |
2000 | */ | |
2001 | scan_file_globals (pst -> objfile); | |
2002 | #endif | |
2003 | ||
2004 | /* Finish up the verbose info message. */ | |
2005 | if (info_verbose) | |
2006 | { | |
2007 | printf_filtered ("done.\n"); | |
2008 | fflush (stdout); | |
2009 | } | |
2010 | } | |
35f5886e FF |
2011 | } |
2012 | } | |
2013 | } | |
2014 | ||
2015 | /* | |
2016 | ||
2017 | LOCAL FUNCTION | |
2018 | ||
2019 | init_psymbol_list -- initialize storage for partial symbols | |
2020 | ||
2021 | SYNOPSIS | |
2022 | ||
1ab3bf1b | 2023 | static void init_psymbol_list (struct objfile *objfile, int total_symbols) |
35f5886e FF |
2024 | |
2025 | DESCRIPTION | |
2026 | ||
2027 | Initializes storage for all of the partial symbols that will be | |
2028 | created by dwarf_build_psymtabs and subsidiaries. | |
2029 | */ | |
2030 | ||
2031 | static void | |
1ab3bf1b JG |
2032 | init_psymbol_list (objfile, total_symbols) |
2033 | struct objfile *objfile; | |
2034 | int total_symbols; | |
35f5886e FF |
2035 | { |
2036 | /* Free any previously allocated psymbol lists. */ | |
2037 | ||
1ab3bf1b | 2038 | if (objfile -> global_psymbols.list) |
35f5886e | 2039 | { |
84ffdec2 | 2040 | mfree (objfile -> md, (PTR)objfile -> global_psymbols.list); |
35f5886e | 2041 | } |
1ab3bf1b | 2042 | if (objfile -> static_psymbols.list) |
35f5886e | 2043 | { |
84ffdec2 | 2044 | mfree (objfile -> md, (PTR)objfile -> static_psymbols.list); |
35f5886e FF |
2045 | } |
2046 | ||
2047 | /* Current best guess is that there are approximately a twentieth | |
2048 | of the total symbols (in a debugging file) are global or static | |
2049 | oriented symbols */ | |
2050 | ||
1ab3bf1b JG |
2051 | objfile -> global_psymbols.size = total_symbols / 10; |
2052 | objfile -> static_psymbols.size = total_symbols / 10; | |
2053 | objfile -> global_psymbols.next = | |
2054 | objfile -> global_psymbols.list = (struct partial_symbol *) | |
318bf84f | 2055 | xmmalloc (objfile -> md, objfile -> global_psymbols.size |
1ab3bf1b JG |
2056 | * sizeof (struct partial_symbol)); |
2057 | objfile -> static_psymbols.next = | |
2058 | objfile -> static_psymbols.list = (struct partial_symbol *) | |
318bf84f | 2059 | xmmalloc (objfile -> md, objfile -> static_psymbols.size |
1ab3bf1b | 2060 | * sizeof (struct partial_symbol)); |
35f5886e FF |
2061 | } |
2062 | ||
35f5886e FF |
2063 | /* |
2064 | ||
715cafcb FF |
2065 | LOCAL FUNCTION |
2066 | ||
2067 | add_enum_psymbol -- add enumeration members to partial symbol table | |
2068 | ||
2069 | DESCRIPTION | |
2070 | ||
2071 | Given pointer to a DIE that is known to be for an enumeration, | |
2072 | extract the symbolic names of the enumeration members and add | |
2073 | partial symbols for them. | |
2074 | */ | |
2075 | ||
2076 | static void | |
1ab3bf1b JG |
2077 | add_enum_psymbol (dip, objfile) |
2078 | struct dieinfo *dip; | |
2079 | struct objfile *objfile; | |
715cafcb FF |
2080 | { |
2081 | char *scan; | |
2082 | char *listend; | |
2083 | long ltemp; | |
2084 | short stemp; | |
2085 | ||
2086 | if ((scan = dip -> at_element_list) != NULL) | |
2087 | { | |
2088 | if (dip -> short_element_list) | |
2089 | { | |
2090 | (void) memcpy (&stemp, scan, sizeof (stemp)); | |
2091 | listend = scan + stemp + sizeof (stemp); | |
2092 | scan += sizeof (stemp); | |
2093 | } | |
2094 | else | |
2095 | { | |
2096 | (void) memcpy (<emp, scan, sizeof (ltemp)); | |
2097 | listend = scan + ltemp + sizeof (ltemp); | |
2098 | scan += sizeof (ltemp); | |
2099 | } | |
2100 | while (scan < listend) | |
2101 | { | |
2102 | scan += sizeof (long); | |
b440b1e9 | 2103 | ADD_PSYMBOL_TO_LIST (scan, strlen (scan), VAR_NAMESPACE, LOC_CONST, |
1ab3bf1b | 2104 | objfile -> static_psymbols, 0); |
715cafcb FF |
2105 | scan += strlen (scan) + 1; |
2106 | } | |
2107 | } | |
2108 | } | |
2109 | ||
2110 | /* | |
2111 | ||
35f5886e FF |
2112 | LOCAL FUNCTION |
2113 | ||
2114 | add_partial_symbol -- add symbol to partial symbol table | |
2115 | ||
2116 | DESCRIPTION | |
2117 | ||
2118 | Given a DIE, if it is one of the types that we want to | |
2119 | add to a partial symbol table, finish filling in the die info | |
2120 | and then add a partial symbol table entry for it. | |
2121 | ||
2122 | */ | |
2123 | ||
2124 | static void | |
1ab3bf1b JG |
2125 | add_partial_symbol (dip, objfile) |
2126 | struct dieinfo *dip; | |
2127 | struct objfile *objfile; | |
35f5886e FF |
2128 | { |
2129 | switch (dip -> dietag) | |
2130 | { | |
2131 | case TAG_global_subroutine: | |
1ab3bf1b JG |
2132 | record_minimal_symbol (dip -> at_name, dip -> at_low_pc, mst_text, |
2133 | objfile); | |
b440b1e9 | 2134 | ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name), |
1ab3bf1b JG |
2135 | VAR_NAMESPACE, LOC_BLOCK, |
2136 | objfile -> global_psymbols, | |
b440b1e9 | 2137 | dip -> at_low_pc); |
35f5886e FF |
2138 | break; |
2139 | case TAG_global_variable: | |
1ab3bf1b JG |
2140 | record_minimal_symbol (dip -> at_name, locval (dip -> at_location), |
2141 | mst_data, objfile); | |
b440b1e9 | 2142 | ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name), |
1ab3bf1b JG |
2143 | VAR_NAMESPACE, LOC_STATIC, |
2144 | objfile -> global_psymbols, | |
b440b1e9 | 2145 | 0); |
35f5886e FF |
2146 | break; |
2147 | case TAG_subroutine: | |
b440b1e9 | 2148 | ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name), |
1ab3bf1b JG |
2149 | VAR_NAMESPACE, LOC_BLOCK, |
2150 | objfile -> static_psymbols, | |
b440b1e9 | 2151 | dip -> at_low_pc); |
35f5886e FF |
2152 | break; |
2153 | case TAG_local_variable: | |
b440b1e9 | 2154 | ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name), |
1ab3bf1b JG |
2155 | VAR_NAMESPACE, LOC_STATIC, |
2156 | objfile -> static_psymbols, | |
b440b1e9 | 2157 | 0); |
35f5886e FF |
2158 | break; |
2159 | case TAG_typedef: | |
b440b1e9 | 2160 | ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name), |
1ab3bf1b JG |
2161 | VAR_NAMESPACE, LOC_TYPEDEF, |
2162 | objfile -> static_psymbols, | |
b440b1e9 | 2163 | 0); |
35f5886e FF |
2164 | break; |
2165 | case TAG_structure_type: | |
2166 | case TAG_union_type: | |
b440b1e9 | 2167 | ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name), |
1ab3bf1b JG |
2168 | STRUCT_NAMESPACE, LOC_TYPEDEF, |
2169 | objfile -> static_psymbols, | |
b440b1e9 | 2170 | 0); |
35f5886e | 2171 | break; |
715cafcb FF |
2172 | case TAG_enumeration_type: |
2173 | if (dip -> at_name) | |
2174 | { | |
b440b1e9 | 2175 | ADD_PSYMBOL_TO_LIST (dip -> at_name, strlen (dip -> at_name), |
1ab3bf1b JG |
2176 | STRUCT_NAMESPACE, LOC_TYPEDEF, |
2177 | objfile -> static_psymbols, | |
b440b1e9 | 2178 | 0); |
715cafcb | 2179 | } |
1ab3bf1b | 2180 | add_enum_psymbol (dip, objfile); |
715cafcb | 2181 | break; |
35f5886e FF |
2182 | } |
2183 | } | |
2184 | ||
2185 | /* | |
2186 | ||
2187 | LOCAL FUNCTION | |
2188 | ||
2189 | scan_partial_symbols -- scan DIE's within a single compilation unit | |
2190 | ||
2191 | DESCRIPTION | |
2192 | ||
2193 | Process the DIE's within a single compilation unit, looking for | |
2194 | interesting DIE's that contribute to the partial symbol table entry | |
2195 | for this compilation unit. Since we cannot follow any sibling | |
2196 | chains without reading the complete DIE info for every DIE, | |
2197 | it is probably faster to just sequentially check each one to | |
715cafcb FF |
2198 | see if it is one of the types we are interested in, and if so, |
2199 | then extract all the attributes info and generate a partial | |
2200 | symbol table entry. | |
35f5886e | 2201 | |
2d6186f4 FF |
2202 | NOTES |
2203 | ||
715cafcb FF |
2204 | Don't attempt to add anonymous structures or unions since they have |
2205 | no name. Anonymous enumerations however are processed, because we | |
2206 | want to extract their member names (the check for a tag name is | |
2207 | done later). | |
2d6186f4 | 2208 | |
715cafcb FF |
2209 | Also, for variables and subroutines, check that this is the place |
2210 | where the actual definition occurs, rather than just a reference | |
2211 | to an external. | |
35f5886e FF |
2212 | */ |
2213 | ||
2214 | static void | |
1ab3bf1b JG |
2215 | scan_partial_symbols (thisdie, enddie, objfile) |
2216 | char *thisdie; | |
2217 | char *enddie; | |
2218 | struct objfile *objfile; | |
35f5886e FF |
2219 | { |
2220 | char *nextdie; | |
2221 | struct dieinfo di; | |
2222 | ||
2223 | while (thisdie < enddie) | |
2224 | { | |
2225 | basicdieinfo (&di, thisdie); | |
2226 | if (di.dielength < sizeof (long)) | |
2227 | { | |
2228 | break; | |
2229 | } | |
2230 | else | |
2231 | { | |
2232 | nextdie = thisdie + di.dielength; | |
715cafcb FF |
2233 | /* To avoid getting complete die information for every die, we |
2234 | only do it (below) for the cases we are interested in. */ | |
35f5886e FF |
2235 | switch (di.dietag) |
2236 | { | |
2237 | case TAG_global_subroutine: | |
35f5886e | 2238 | case TAG_subroutine: |
2d6186f4 | 2239 | case TAG_global_variable: |
35f5886e | 2240 | case TAG_local_variable: |
2d6186f4 FF |
2241 | completedieinfo (&di); |
2242 | if (di.at_name && (di.has_at_low_pc || di.at_location)) | |
2243 | { | |
1ab3bf1b | 2244 | add_partial_symbol (&di, objfile); |
2d6186f4 FF |
2245 | } |
2246 | break; | |
35f5886e FF |
2247 | case TAG_typedef: |
2248 | case TAG_structure_type: | |
2249 | case TAG_union_type: | |
35f5886e | 2250 | completedieinfo (&di); |
2d6186f4 | 2251 | if (di.at_name) |
35f5886e | 2252 | { |
1ab3bf1b | 2253 | add_partial_symbol (&di, objfile); |
35f5886e FF |
2254 | } |
2255 | break; | |
715cafcb FF |
2256 | case TAG_enumeration_type: |
2257 | completedieinfo (&di); | |
1ab3bf1b | 2258 | add_partial_symbol (&di, objfile); |
715cafcb | 2259 | break; |
35f5886e FF |
2260 | } |
2261 | } | |
2262 | thisdie = nextdie; | |
2263 | } | |
2264 | } | |
2265 | ||
2266 | /* | |
2267 | ||
2268 | LOCAL FUNCTION | |
2269 | ||
2270 | scan_compilation_units -- build a psymtab entry for each compilation | |
2271 | ||
2272 | DESCRIPTION | |
2273 | ||
2274 | This is the top level dwarf parsing routine for building partial | |
2275 | symbol tables. | |
2276 | ||
2277 | It scans from the beginning of the DWARF table looking for the first | |
2278 | TAG_compile_unit DIE, and then follows the sibling chain to locate | |
2279 | each additional TAG_compile_unit DIE. | |
2280 | ||
2281 | For each TAG_compile_unit DIE it creates a partial symtab structure, | |
2282 | calls a subordinate routine to collect all the compilation unit's | |
2283 | global DIE's, file scope DIEs, typedef DIEs, etc, and then links the | |
2284 | new partial symtab structure into the partial symbol table. It also | |
2285 | records the appropriate information in the partial symbol table entry | |
2286 | to allow the chunk of DIE's and line number table for this compilation | |
2287 | unit to be located and re-read later, to generate a complete symbol | |
2288 | table entry for the compilation unit. | |
2289 | ||
2290 | Thus it effectively partitions up a chunk of DIE's for multiple | |
2291 | compilation units into smaller DIE chunks and line number tables, | |
2292 | and associates them with a partial symbol table entry. | |
2293 | ||
2294 | NOTES | |
2295 | ||
2296 | If any compilation unit has no line number table associated with | |
2297 | it for some reason (a missing at_stmt_list attribute, rather than | |
2298 | just one with a value of zero, which is valid) then we ensure that | |
2299 | the recorded file offset is zero so that the routine which later | |
2300 | reads line number table fragments knows that there is no fragment | |
2301 | to read. | |
2302 | ||
2303 | RETURNS | |
2304 | ||
2305 | Returns no value. | |
2306 | ||
2307 | */ | |
2308 | ||
2309 | static void | |
1ab3bf1b JG |
2310 | scan_compilation_units (filename, thisdie, enddie, dbfoff, lnoffset, objfile) |
2311 | char *filename; | |
2312 | char *thisdie; | |
2313 | char *enddie; | |
2314 | unsigned int dbfoff; | |
2315 | unsigned int lnoffset; | |
2316 | struct objfile *objfile; | |
35f5886e FF |
2317 | { |
2318 | char *nextdie; | |
2319 | struct dieinfo di; | |
2320 | struct partial_symtab *pst; | |
2321 | int culength; | |
2322 | int curoff; | |
2323 | int curlnoffset; | |
2324 | ||
2325 | while (thisdie < enddie) | |
2326 | { | |
2327 | basicdieinfo (&di, thisdie); | |
2328 | if (di.dielength < sizeof (long)) | |
2329 | { | |
2330 | break; | |
2331 | } | |
2332 | else if (di.dietag != TAG_compile_unit) | |
2333 | { | |
2334 | nextdie = thisdie + di.dielength; | |
2335 | } | |
2336 | else | |
2337 | { | |
2338 | completedieinfo (&di); | |
2339 | if (di.at_sibling != 0) | |
2340 | { | |
2341 | nextdie = dbbase + di.at_sibling - dbroff; | |
2342 | } | |
2343 | else | |
2344 | { | |
2345 | nextdie = thisdie + di.dielength; | |
2346 | } | |
2347 | curoff = thisdie - dbbase; | |
2348 | culength = nextdie - thisdie; | |
2d6186f4 | 2349 | curlnoffset = di.has_at_stmt_list ? lnoffset + di.at_stmt_list : 0; |
1ab3bf1b JG |
2350 | |
2351 | /* First allocate a new partial symbol table structure */ | |
2352 | ||
2353 | pst = start_psymtab_common (objfile, baseaddr, di.at_name, | |
2354 | di.at_low_pc, | |
2355 | objfile -> global_psymbols.next, | |
2356 | objfile -> static_psymbols.next); | |
2357 | ||
2358 | pst -> texthigh = di.at_high_pc; | |
2359 | pst -> read_symtab_private = (char *) | |
2360 | obstack_alloc (&objfile -> psymbol_obstack, | |
2361 | sizeof (struct dwfinfo)); | |
2362 | DBFOFF (pst) = dbfoff; | |
2363 | DBROFF (pst) = curoff; | |
2364 | DBLENGTH (pst) = culength; | |
2365 | LNFOFF (pst) = curlnoffset; | |
2366 | pst -> read_symtab = dwarf_psymtab_to_symtab; | |
2367 | ||
2368 | /* Now look for partial symbols */ | |
2369 | ||
2370 | scan_partial_symbols (thisdie + di.dielength, nextdie, objfile); | |
2371 | ||
2372 | pst -> n_global_syms = objfile -> global_psymbols.next - | |
2373 | (objfile -> global_psymbols.list + pst -> globals_offset); | |
2374 | pst -> n_static_syms = objfile -> static_psymbols.next - | |
2375 | (objfile -> static_psymbols.list + pst -> statics_offset); | |
2376 | sort_pst_symbols (pst); | |
35f5886e FF |
2377 | /* If there is already a psymtab or symtab for a file of this name, |
2378 | remove it. (If there is a symtab, more drastic things also | |
2379 | happen.) This happens in VxWorks. */ | |
2380 | free_named_symtabs (pst -> filename); | |
35f5886e FF |
2381 | } |
2382 | thisdie = nextdie; | |
2383 | } | |
2384 | } | |
2385 | ||
2386 | /* | |
2387 | ||
2388 | LOCAL FUNCTION | |
2389 | ||
2390 | new_symbol -- make a symbol table entry for a new symbol | |
2391 | ||
2392 | SYNOPSIS | |
2393 | ||
1ab3bf1b JG |
2394 | static struct symbol *new_symbol (struct dieinfo *dip, |
2395 | struct objfile *objfile) | |
35f5886e FF |
2396 | |
2397 | DESCRIPTION | |
2398 | ||
2399 | Given a pointer to a DWARF information entry, figure out if we need | |
2400 | to make a symbol table entry for it, and if so, create a new entry | |
2401 | and return a pointer to it. | |
2402 | */ | |
2403 | ||
2404 | static struct symbol * | |
1ab3bf1b JG |
2405 | new_symbol (dip, objfile) |
2406 | struct dieinfo *dip; | |
2407 | struct objfile *objfile; | |
35f5886e FF |
2408 | { |
2409 | struct symbol *sym = NULL; | |
2410 | ||
2411 | if (dip -> at_name != NULL) | |
2412 | { | |
1ab3bf1b | 2413 | sym = (struct symbol *) obstack_alloc (&objfile -> symbol_obstack, |
35f5886e FF |
2414 | sizeof (struct symbol)); |
2415 | (void) memset (sym, 0, sizeof (struct symbol)); | |
1ab3bf1b | 2416 | SYMBOL_NAME (sym) = create_name (dip -> at_name, &objfile->symbol_obstack); |
35f5886e FF |
2417 | /* default assumptions */ |
2418 | SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; | |
2419 | SYMBOL_CLASS (sym) = LOC_STATIC; | |
2420 | SYMBOL_TYPE (sym) = decode_die_type (dip); | |
2421 | switch (dip -> dietag) | |
2422 | { | |
2423 | case TAG_label: | |
4d315a07 | 2424 | SYMBOL_VALUE (sym) = dip -> at_low_pc; |
35f5886e FF |
2425 | SYMBOL_CLASS (sym) = LOC_LABEL; |
2426 | break; | |
2427 | case TAG_global_subroutine: | |
2428 | case TAG_subroutine: | |
4d315a07 | 2429 | SYMBOL_VALUE (sym) = dip -> at_low_pc; |
35f5886e FF |
2430 | SYMBOL_TYPE (sym) = lookup_function_type (SYMBOL_TYPE (sym)); |
2431 | SYMBOL_CLASS (sym) = LOC_BLOCK; | |
2432 | if (dip -> dietag == TAG_global_subroutine) | |
2433 | { | |
2434 | add_symbol_to_list (sym, &global_symbols); | |
2435 | } | |
2436 | else | |
2437 | { | |
4d315a07 | 2438 | add_symbol_to_list (sym, list_in_scope); |
35f5886e FF |
2439 | } |
2440 | break; | |
2441 | case TAG_global_variable: | |
35f5886e FF |
2442 | if (dip -> at_location != NULL) |
2443 | { | |
2444 | SYMBOL_VALUE (sym) = locval (dip -> at_location); | |
35f5886e FF |
2445 | add_symbol_to_list (sym, &global_symbols); |
2446 | SYMBOL_CLASS (sym) = LOC_STATIC; | |
2447 | SYMBOL_VALUE (sym) += baseaddr; | |
2448 | } | |
a5bd5ba6 FF |
2449 | break; |
2450 | case TAG_local_variable: | |
2451 | if (dip -> at_location != NULL) | |
35f5886e | 2452 | { |
a5bd5ba6 | 2453 | SYMBOL_VALUE (sym) = locval (dip -> at_location); |
4d315a07 | 2454 | add_symbol_to_list (sym, list_in_scope); |
a5bd5ba6 FF |
2455 | if (isreg) |
2456 | { | |
2457 | SYMBOL_CLASS (sym) = LOC_REGISTER; | |
2458 | } | |
2459 | else if (offreg) | |
35f5886e | 2460 | { |
a5bd5ba6 | 2461 | SYMBOL_CLASS (sym) = LOC_LOCAL; |
35f5886e FF |
2462 | } |
2463 | else | |
2464 | { | |
2465 | SYMBOL_CLASS (sym) = LOC_STATIC; | |
2466 | SYMBOL_VALUE (sym) += baseaddr; | |
2467 | } | |
2468 | } | |
2469 | break; | |
2470 | case TAG_formal_parameter: | |
2471 | if (dip -> at_location != NULL) | |
2472 | { | |
2473 | SYMBOL_VALUE (sym) = locval (dip -> at_location); | |
2474 | } | |
4d315a07 | 2475 | add_symbol_to_list (sym, list_in_scope); |
35f5886e FF |
2476 | if (isreg) |
2477 | { | |
2478 | SYMBOL_CLASS (sym) = LOC_REGPARM; | |
2479 | } | |
2480 | else | |
2481 | { | |
2482 | SYMBOL_CLASS (sym) = LOC_ARG; | |
2483 | } | |
2484 | break; | |
2485 | case TAG_unspecified_parameters: | |
2486 | /* From varargs functions; gdb doesn't seem to have any interest in | |
2487 | this information, so just ignore it for now. (FIXME?) */ | |
2488 | break; | |
2489 | case TAG_structure_type: | |
2490 | case TAG_union_type: | |
2491 | case TAG_enumeration_type: | |
2492 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; | |
2493 | SYMBOL_NAMESPACE (sym) = STRUCT_NAMESPACE; | |
4d315a07 | 2494 | add_symbol_to_list (sym, list_in_scope); |
35f5886e FF |
2495 | break; |
2496 | case TAG_typedef: | |
2497 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; | |
2498 | SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; | |
4d315a07 | 2499 | add_symbol_to_list (sym, list_in_scope); |
35f5886e FF |
2500 | break; |
2501 | default: | |
2502 | /* Not a tag we recognize. Hopefully we aren't processing trash | |
2503 | data, but since we must specifically ignore things we don't | |
2504 | recognize, there is nothing else we should do at this point. */ | |
2505 | break; | |
2506 | } | |
2507 | } | |
2508 | return (sym); | |
2509 | } | |
2510 | ||
2511 | /* | |
2512 | ||
2513 | LOCAL FUNCTION | |
2514 | ||
2515 | decode_mod_fund_type -- decode a modified fundamental type | |
2516 | ||
2517 | SYNOPSIS | |
2518 | ||
2519 | static struct type *decode_mod_fund_type (char *typedata) | |
2520 | ||
2521 | DESCRIPTION | |
2522 | ||
2523 | Decode a block of data containing a modified fundamental | |
2524 | type specification. TYPEDATA is a pointer to the block, | |
2525 | which consists of a two byte length, containing the size | |
2526 | of the rest of the block. At the end of the block is a | |
2527 | two byte value that gives the fundamental type. Everything | |
2528 | in between are type modifiers. | |
2529 | ||
2530 | We simply compute the number of modifiers and call the general | |
2531 | function decode_modified_type to do the actual work. | |
2532 | */ | |
2533 | ||
2534 | static struct type * | |
1ab3bf1b JG |
2535 | decode_mod_fund_type (typedata) |
2536 | char *typedata; | |
35f5886e FF |
2537 | { |
2538 | struct type *typep = NULL; | |
2539 | unsigned short modcount; | |
2540 | unsigned char *modifiers; | |
2541 | ||
2542 | /* Get the total size of the block, exclusive of the size itself */ | |
2543 | (void) memcpy (&modcount, typedata, sizeof (short)); | |
2544 | /* Deduct the size of the fundamental type bytes at the end of the block. */ | |
2545 | modcount -= sizeof (short); | |
2546 | /* Skip over the two size bytes at the beginning of the block. */ | |
c8c0a2bd | 2547 | modifiers = (unsigned char *) typedata + sizeof (short); |
35f5886e FF |
2548 | /* Now do the actual decoding */ |
2549 | typep = decode_modified_type (modifiers, modcount, AT_mod_fund_type); | |
2550 | return (typep); | |
2551 | } | |
2552 | ||
2553 | /* | |
2554 | ||
2555 | LOCAL FUNCTION | |
2556 | ||
2557 | decode_mod_u_d_type -- decode a modified user defined type | |
2558 | ||
2559 | SYNOPSIS | |
2560 | ||
2561 | static struct type *decode_mod_u_d_type (char *typedata) | |
2562 | ||
2563 | DESCRIPTION | |
2564 | ||
2565 | Decode a block of data containing a modified user defined | |
2566 | type specification. TYPEDATA is a pointer to the block, | |
2567 | which consists of a two byte length, containing the size | |
2568 | of the rest of the block. At the end of the block is a | |
2569 | four byte value that gives a reference to a user defined type. | |
2570 | Everything in between are type modifiers. | |
2571 | ||
2572 | We simply compute the number of modifiers and call the general | |
2573 | function decode_modified_type to do the actual work. | |
2574 | */ | |
2575 | ||
2576 | static struct type * | |
1ab3bf1b JG |
2577 | decode_mod_u_d_type (typedata) |
2578 | char *typedata; | |
35f5886e FF |
2579 | { |
2580 | struct type *typep = NULL; | |
2581 | unsigned short modcount; | |
2582 | unsigned char *modifiers; | |
2583 | ||
2584 | /* Get the total size of the block, exclusive of the size itself */ | |
2585 | (void) memcpy (&modcount, typedata, sizeof (short)); | |
2586 | /* Deduct the size of the reference type bytes at the end of the block. */ | |
2587 | modcount -= sizeof (long); | |
2588 | /* Skip over the two size bytes at the beginning of the block. */ | |
c8c0a2bd | 2589 | modifiers = (unsigned char *) typedata + sizeof (short); |
35f5886e FF |
2590 | /* Now do the actual decoding */ |
2591 | typep = decode_modified_type (modifiers, modcount, AT_mod_u_d_type); | |
2592 | return (typep); | |
2593 | } | |
2594 | ||
2595 | /* | |
2596 | ||
2597 | LOCAL FUNCTION | |
2598 | ||
2599 | decode_modified_type -- decode modified user or fundamental type | |
2600 | ||
2601 | SYNOPSIS | |
2602 | ||
2603 | static struct type *decode_modified_type (unsigned char *modifiers, | |
2604 | unsigned short modcount, int mtype) | |
2605 | ||
2606 | DESCRIPTION | |
2607 | ||
2608 | Decode a modified type, either a modified fundamental type or | |
2609 | a modified user defined type. MODIFIERS is a pointer to the | |
2610 | block of bytes that define MODCOUNT modifiers. Immediately | |
2611 | following the last modifier is a short containing the fundamental | |
2612 | type or a long containing the reference to the user defined | |
2613 | type. Which one is determined by MTYPE, which is either | |
2614 | AT_mod_fund_type or AT_mod_u_d_type to indicate what modified | |
2615 | type we are generating. | |
2616 | ||
2617 | We call ourself recursively to generate each modified type,` | |
2618 | until MODCOUNT reaches zero, at which point we have consumed | |
2619 | all the modifiers and generate either the fundamental type or | |
2620 | user defined type. When the recursion unwinds, each modifier | |
2621 | is applied in turn to generate the full modified type. | |
2622 | ||
2623 | NOTES | |
2624 | ||
2625 | If we find a modifier that we don't recognize, and it is not one | |
2626 | of those reserved for application specific use, then we issue a | |
2627 | warning and simply ignore the modifier. | |
2628 | ||
2629 | BUGS | |
2630 | ||
2631 | We currently ignore MOD_const and MOD_volatile. (FIXME) | |
2632 | ||
2633 | */ | |
2634 | ||
2635 | static struct type * | |
1ab3bf1b JG |
2636 | decode_modified_type (modifiers, modcount, mtype) |
2637 | unsigned char *modifiers; | |
2638 | unsigned int modcount; | |
2639 | int mtype; | |
35f5886e FF |
2640 | { |
2641 | struct type *typep = NULL; | |
2642 | unsigned short fundtype; | |
2643 | DIEREF dieref; | |
2644 | unsigned char modifier; | |
2645 | ||
2646 | if (modcount == 0) | |
2647 | { | |
2648 | switch (mtype) | |
2649 | { | |
2650 | case AT_mod_fund_type: | |
2651 | (void) memcpy (&fundtype, modifiers, sizeof (short)); | |
2652 | typep = decode_fund_type (fundtype); | |
2653 | break; | |
2654 | case AT_mod_u_d_type: | |
2655 | (void) memcpy (&dieref, modifiers, sizeof (DIEREF)); | |
2656 | if ((typep = lookup_utype (dieref)) == NULL) | |
2657 | { | |
2658 | typep = alloc_utype (dieref, NULL); | |
2659 | } | |
2660 | break; | |
2661 | default: | |
2662 | SQUAWK (("botched modified type decoding (mtype 0x%x)", mtype)); | |
1ab3bf1b | 2663 | typep = lookup_fundamental_type (current_objfile, FT_INTEGER); |
35f5886e FF |
2664 | break; |
2665 | } | |
2666 | } | |
2667 | else | |
2668 | { | |
2669 | modifier = *modifiers++; | |
2670 | typep = decode_modified_type (modifiers, --modcount, mtype); | |
2671 | switch (modifier) | |
2672 | { | |
2673 | case MOD_pointer_to: | |
2674 | typep = lookup_pointer_type (typep); | |
2675 | break; | |
2676 | case MOD_reference_to: | |
2677 | typep = lookup_reference_type (typep); | |
2678 | break; | |
2679 | case MOD_const: | |
2680 | SQUAWK (("type modifier 'const' ignored")); /* FIXME */ | |
2681 | break; | |
2682 | case MOD_volatile: | |
2683 | SQUAWK (("type modifier 'volatile' ignored")); /* FIXME */ | |
2684 | break; | |
2685 | default: | |
2686 | if (!(MOD_lo_user <= modifier && modifier <= MOD_hi_user)) | |
2687 | { | |
2688 | SQUAWK (("unknown type modifier %u", modifier)); | |
2689 | } | |
2690 | break; | |
2691 | } | |
2692 | } | |
2693 | return (typep); | |
2694 | } | |
2695 | ||
2696 | /* | |
2697 | ||
2698 | LOCAL FUNCTION | |
2699 | ||
2700 | decode_fund_type -- translate basic DWARF type to gdb base type | |
2701 | ||
2702 | DESCRIPTION | |
2703 | ||
2704 | Given an integer that is one of the fundamental DWARF types, | |
2705 | translate it to one of the basic internal gdb types and return | |
2706 | a pointer to the appropriate gdb type (a "struct type *"). | |
2707 | ||
2708 | NOTES | |
2709 | ||
2710 | If we encounter a fundamental type that we are unprepared to | |
2711 | deal with, and it is not in the range of those types defined | |
2712 | as application specific types, then we issue a warning and | |
1ab3bf1b | 2713 | treat the type as an "int". |
35f5886e FF |
2714 | */ |
2715 | ||
2716 | static struct type * | |
1ab3bf1b JG |
2717 | decode_fund_type (fundtype) |
2718 | unsigned int fundtype; | |
35f5886e FF |
2719 | { |
2720 | struct type *typep = NULL; | |
2721 | ||
2722 | switch (fundtype) | |
2723 | { | |
2724 | ||
2725 | case FT_void: | |
1ab3bf1b | 2726 | typep = lookup_fundamental_type (current_objfile, FT_VOID); |
35f5886e FF |
2727 | break; |
2728 | ||
1ab3bf1b JG |
2729 | case FT_boolean: /* Was FT_set in AT&T version */ |
2730 | typep = lookup_fundamental_type (current_objfile, FT_BOOLEAN); | |
2731 | break; | |
2732 | ||
35f5886e | 2733 | case FT_pointer: /* (void *) */ |
1ab3bf1b JG |
2734 | typep = lookup_fundamental_type (current_objfile, FT_VOID); |
2735 | typep = lookup_pointer_type (typep); | |
35f5886e FF |
2736 | break; |
2737 | ||
2738 | case FT_char: | |
1ab3bf1b JG |
2739 | typep = lookup_fundamental_type (current_objfile, FT_CHAR); |
2740 | break; | |
2741 | ||
35f5886e | 2742 | case FT_signed_char: |
1ab3bf1b JG |
2743 | typep = lookup_fundamental_type (current_objfile, FT_SIGNED_CHAR); |
2744 | break; | |
2745 | ||
2746 | case FT_unsigned_char: | |
2747 | typep = lookup_fundamental_type (current_objfile, FT_UNSIGNED_CHAR); | |
35f5886e FF |
2748 | break; |
2749 | ||
2750 | case FT_short: | |
1ab3bf1b JG |
2751 | typep = lookup_fundamental_type (current_objfile, FT_SHORT); |
2752 | break; | |
2753 | ||
35f5886e | 2754 | case FT_signed_short: |
1ab3bf1b JG |
2755 | typep = lookup_fundamental_type (current_objfile, FT_SIGNED_SHORT); |
2756 | break; | |
2757 | ||
2758 | case FT_unsigned_short: | |
2759 | typep = lookup_fundamental_type (current_objfile, FT_UNSIGNED_SHORT); | |
35f5886e FF |
2760 | break; |
2761 | ||
2762 | case FT_integer: | |
1ab3bf1b JG |
2763 | typep = lookup_fundamental_type (current_objfile, FT_INTEGER); |
2764 | break; | |
2765 | ||
35f5886e | 2766 | case FT_signed_integer: |
1ab3bf1b JG |
2767 | typep = lookup_fundamental_type (current_objfile, FT_SIGNED_INTEGER); |
2768 | break; | |
2769 | ||
2770 | case FT_unsigned_integer: | |
2771 | typep = lookup_fundamental_type (current_objfile, FT_UNSIGNED_INTEGER); | |
35f5886e FF |
2772 | break; |
2773 | ||
2774 | case FT_long: | |
1ab3bf1b JG |
2775 | typep = lookup_fundamental_type (current_objfile, FT_LONG); |
2776 | break; | |
2777 | ||
35f5886e | 2778 | case FT_signed_long: |
1ab3bf1b | 2779 | typep = lookup_fundamental_type (current_objfile, FT_SIGNED_LONG); |
35f5886e FF |
2780 | break; |
2781 | ||
1ab3bf1b JG |
2782 | case FT_unsigned_long: |
2783 | typep = lookup_fundamental_type (current_objfile, FT_UNSIGNED_LONG); | |
35f5886e FF |
2784 | break; |
2785 | ||
1ab3bf1b JG |
2786 | case FT_long_long: |
2787 | typep = lookup_fundamental_type (current_objfile, FT_LONG_LONG); | |
35f5886e | 2788 | break; |
1ab3bf1b JG |
2789 | |
2790 | case FT_signed_long_long: | |
2791 | typep = lookup_fundamental_type (current_objfile, FT_SIGNED_LONG_LONG); | |
35f5886e | 2792 | break; |
1ab3bf1b JG |
2793 | |
2794 | case FT_unsigned_long_long: | |
2795 | typep = lookup_fundamental_type (current_objfile, FT_UNSIGNED_LONG_LONG); | |
35f5886e | 2796 | break; |
1ab3bf1b JG |
2797 | |
2798 | case FT_float: | |
2799 | typep = lookup_fundamental_type (current_objfile, FT_FLOAT); | |
35f5886e FF |
2800 | break; |
2801 | ||
1ab3bf1b JG |
2802 | case FT_dbl_prec_float: |
2803 | typep = lookup_fundamental_type (current_objfile, FT_DBL_PREC_FLOAT); | |
35f5886e FF |
2804 | break; |
2805 | ||
2806 | case FT_ext_prec_float: | |
1ab3bf1b | 2807 | typep = lookup_fundamental_type (current_objfile, FT_EXT_PREC_FLOAT); |
35f5886e FF |
2808 | break; |
2809 | ||
2810 | case FT_complex: | |
1ab3bf1b | 2811 | typep = lookup_fundamental_type (current_objfile, FT_COMPLEX); |
35f5886e FF |
2812 | break; |
2813 | ||
2814 | case FT_dbl_prec_complex: | |
1ab3bf1b | 2815 | typep = lookup_fundamental_type (current_objfile, FT_DBL_PREC_COMPLEX); |
35f5886e FF |
2816 | break; |
2817 | ||
1ab3bf1b JG |
2818 | case FT_ext_prec_complex: |
2819 | typep = lookup_fundamental_type (current_objfile, FT_EXT_PREC_COMPLEX); | |
35f5886e | 2820 | break; |
1ab3bf1b | 2821 | |
35f5886e FF |
2822 | } |
2823 | ||
2824 | if ((typep == NULL) && !(FT_lo_user <= fundtype && fundtype <= FT_hi_user)) | |
2825 | { | |
2826 | SQUAWK (("unexpected fundamental type 0x%x", fundtype)); | |
1ab3bf1b | 2827 | typep = lookup_fundamental_type (current_objfile, FT_VOID); |
35f5886e FF |
2828 | } |
2829 | ||
2830 | return (typep); | |
2831 | } | |
2832 | ||
2833 | /* | |
2834 | ||
2835 | LOCAL FUNCTION | |
2836 | ||
2837 | create_name -- allocate a fresh copy of a string on an obstack | |
2838 | ||
2839 | DESCRIPTION | |
2840 | ||
2841 | Given a pointer to a string and a pointer to an obstack, allocates | |
2842 | a fresh copy of the string on the specified obstack. | |
2843 | ||
2844 | */ | |
2845 | ||
2846 | static char * | |
1ab3bf1b JG |
2847 | create_name (name, obstackp) |
2848 | char *name; | |
2849 | struct obstack *obstackp; | |
35f5886e FF |
2850 | { |
2851 | int length; | |
2852 | char *newname; | |
2853 | ||
2854 | length = strlen (name) + 1; | |
2855 | newname = (char *) obstack_alloc (obstackp, length); | |
2856 | (void) strcpy (newname, name); | |
2857 | return (newname); | |
2858 | } | |
2859 | ||
2860 | /* | |
2861 | ||
2862 | LOCAL FUNCTION | |
2863 | ||
2864 | basicdieinfo -- extract the minimal die info from raw die data | |
2865 | ||
2866 | SYNOPSIS | |
2867 | ||
2868 | void basicdieinfo (char *diep, struct dieinfo *dip) | |
2869 | ||
2870 | DESCRIPTION | |
2871 | ||
2872 | Given a pointer to raw DIE data, and a pointer to an instance of a | |
2873 | die info structure, this function extracts the basic information | |
2874 | from the DIE data required to continue processing this DIE, along | |
2875 | with some bookkeeping information about the DIE. | |
2876 | ||
2877 | The information we absolutely must have includes the DIE tag, | |
2878 | and the DIE length. If we need the sibling reference, then we | |
2879 | will have to call completedieinfo() to process all the remaining | |
2880 | DIE information. | |
2881 | ||
2882 | Note that since there is no guarantee that the data is properly | |
2883 | aligned in memory for the type of access required (indirection | |
2884 | through anything other than a char pointer), we use memcpy to | |
2885 | shuffle data items larger than a char. Possibly inefficient, but | |
2886 | quite portable. | |
2887 | ||
2888 | We also take care of some other basic things at this point, such | |
2889 | as ensuring that the instance of the die info structure starts | |
2890 | out completely zero'd and that curdie is initialized for use | |
2891 | in error reporting if we have a problem with the current die. | |
2892 | ||
2893 | NOTES | |
2894 | ||
2895 | All DIE's must have at least a valid length, thus the minimum | |
2896 | DIE size is sizeof (long). In order to have a valid tag, the | |
2897 | DIE size must be at least sizeof (short) larger, otherwise they | |
2898 | are forced to be TAG_padding DIES. | |
2899 | ||
2900 | Padding DIES must be at least sizeof(long) in length, implying that | |
2901 | if a padding DIE is used for alignment and the amount needed is less | |
2902 | than sizeof(long) then the padding DIE has to be big enough to align | |
2903 | to the next alignment boundry. | |
2904 | */ | |
2905 | ||
2906 | static void | |
1ab3bf1b JG |
2907 | basicdieinfo (dip, diep) |
2908 | struct dieinfo *dip; | |
2909 | char *diep; | |
35f5886e FF |
2910 | { |
2911 | curdie = dip; | |
2912 | (void) memset (dip, 0, sizeof (struct dieinfo)); | |
2913 | dip -> die = diep; | |
2914 | dip -> dieref = dbroff + (diep - dbbase); | |
2915 | (void) memcpy (&dip -> dielength, diep, sizeof (long)); | |
2916 | if (dip -> dielength < sizeof (long)) | |
2917 | { | |
2918 | dwarfwarn ("malformed DIE, bad length (%d bytes)", dip -> dielength); | |
2919 | } | |
2920 | else if (dip -> dielength < (sizeof (long) + sizeof (short))) | |
2921 | { | |
2922 | dip -> dietag = TAG_padding; | |
2923 | } | |
2924 | else | |
2925 | { | |
2926 | (void) memcpy (&dip -> dietag, diep + sizeof (long), sizeof (short)); | |
2927 | } | |
2928 | } | |
2929 | ||
2930 | /* | |
2931 | ||
2932 | LOCAL FUNCTION | |
2933 | ||
2934 | completedieinfo -- finish reading the information for a given DIE | |
2935 | ||
2936 | SYNOPSIS | |
2937 | ||
2938 | void completedieinfo (struct dieinfo *dip) | |
2939 | ||
2940 | DESCRIPTION | |
2941 | ||
2942 | Given a pointer to an already partially initialized die info structure, | |
2943 | scan the raw DIE data and finish filling in the die info structure | |
2944 | from the various attributes found. | |
2945 | ||
2946 | Note that since there is no guarantee that the data is properly | |
2947 | aligned in memory for the type of access required (indirection | |
2948 | through anything other than a char pointer), we use memcpy to | |
2949 | shuffle data items larger than a char. Possibly inefficient, but | |
2950 | quite portable. | |
2951 | ||
2952 | NOTES | |
2953 | ||
2954 | Each time we are called, we increment the diecount variable, which | |
2955 | keeps an approximate count of the number of dies processed for | |
2956 | each compilation unit. This information is presented to the user | |
2957 | if the info_verbose flag is set. | |
2958 | ||
2959 | */ | |
2960 | ||
2961 | static void | |
1ab3bf1b JG |
2962 | completedieinfo (dip) |
2963 | struct dieinfo *dip; | |
35f5886e FF |
2964 | { |
2965 | char *diep; /* Current pointer into raw DIE data */ | |
2966 | char *end; /* Terminate DIE scan here */ | |
2967 | unsigned short attr; /* Current attribute being scanned */ | |
2968 | unsigned short form; /* Form of the attribute */ | |
2969 | short block2sz; /* Size of a block2 attribute field */ | |
2970 | long block4sz; /* Size of a block4 attribute field */ | |
2971 | ||
2972 | diecount++; | |
2973 | diep = dip -> die; | |
2974 | end = diep + dip -> dielength; | |
2975 | diep += sizeof (long) + sizeof (short); | |
2976 | while (diep < end) | |
2977 | { | |
2978 | (void) memcpy (&attr, diep, sizeof (short)); | |
2979 | diep += sizeof (short); | |
2980 | switch (attr) | |
2981 | { | |
2982 | case AT_fund_type: | |
2983 | (void) memcpy (&dip -> at_fund_type, diep, sizeof (short)); | |
2984 | break; | |
2985 | case AT_ordering: | |
2986 | (void) memcpy (&dip -> at_ordering, diep, sizeof (short)); | |
2987 | break; | |
2988 | case AT_bit_offset: | |
2989 | (void) memcpy (&dip -> at_bit_offset, diep, sizeof (short)); | |
2990 | break; | |
2991 | case AT_visibility: | |
2992 | (void) memcpy (&dip -> at_visibility, diep, sizeof (short)); | |
2993 | break; | |
2994 | case AT_sibling: | |
2995 | (void) memcpy (&dip -> at_sibling, diep, sizeof (long)); | |
2996 | break; | |
2997 | case AT_stmt_list: | |
2998 | (void) memcpy (&dip -> at_stmt_list, diep, sizeof (long)); | |
2d6186f4 | 2999 | dip -> has_at_stmt_list = 1; |
35f5886e FF |
3000 | break; |
3001 | case AT_low_pc: | |
3002 | (void) memcpy (&dip -> at_low_pc, diep, sizeof (long)); | |
4d315a07 | 3003 | dip -> at_low_pc += baseaddr; |
2d6186f4 | 3004 | dip -> has_at_low_pc = 1; |
35f5886e FF |
3005 | break; |
3006 | case AT_high_pc: | |
3007 | (void) memcpy (&dip -> at_high_pc, diep, sizeof (long)); | |
4d315a07 | 3008 | dip -> at_high_pc += baseaddr; |
35f5886e FF |
3009 | break; |
3010 | case AT_language: | |
3011 | (void) memcpy (&dip -> at_language, diep, sizeof (long)); | |
3012 | break; | |
3013 | case AT_user_def_type: | |
3014 | (void) memcpy (&dip -> at_user_def_type, diep, sizeof (long)); | |
3015 | break; | |
3016 | case AT_byte_size: | |
3017 | (void) memcpy (&dip -> at_byte_size, diep, sizeof (long)); | |
3018 | break; | |
3019 | case AT_bit_size: | |
3020 | (void) memcpy (&dip -> at_bit_size, diep, sizeof (long)); | |
3021 | break; | |
3022 | case AT_member: | |
3023 | (void) memcpy (&dip -> at_member, diep, sizeof (long)); | |
3024 | break; | |
3025 | case AT_discr: | |
3026 | (void) memcpy (&dip -> at_discr, diep, sizeof (long)); | |
3027 | break; | |
3028 | case AT_import: | |
3029 | (void) memcpy (&dip -> at_import, diep, sizeof (long)); | |
3030 | break; | |
3031 | case AT_location: | |
3032 | dip -> at_location = diep; | |
3033 | break; | |
3034 | case AT_mod_fund_type: | |
3035 | dip -> at_mod_fund_type = diep; | |
3036 | break; | |
3037 | case AT_subscr_data: | |
3038 | dip -> at_subscr_data = diep; | |
3039 | break; | |
3040 | case AT_mod_u_d_type: | |
3041 | dip -> at_mod_u_d_type = diep; | |
3042 | break; | |
35f5886e FF |
3043 | case AT_element_list: |
3044 | dip -> at_element_list = diep; | |
768be6e1 FF |
3045 | dip -> short_element_list = 0; |
3046 | break; | |
3047 | case AT_short_element_list: | |
3048 | dip -> at_element_list = diep; | |
3049 | dip -> short_element_list = 1; | |
35f5886e FF |
3050 | break; |
3051 | case AT_discr_value: | |
3052 | dip -> at_discr_value = diep; | |
3053 | break; | |
3054 | case AT_string_length: | |
3055 | dip -> at_string_length = diep; | |
3056 | break; | |
3057 | case AT_name: | |
3058 | dip -> at_name = diep; | |
3059 | break; | |
3060 | case AT_comp_dir: | |
3061 | dip -> at_comp_dir = diep; | |
3062 | break; | |
3063 | case AT_producer: | |
3064 | dip -> at_producer = diep; | |
3065 | break; | |
35f5886e FF |
3066 | case AT_frame_base: |
3067 | (void) memcpy (&dip -> at_frame_base, diep, sizeof (long)); | |
3068 | break; | |
35f5886e FF |
3069 | case AT_start_scope: |
3070 | (void) memcpy (&dip -> at_start_scope, diep, sizeof (long)); | |
3071 | break; | |
3072 | case AT_stride_size: | |
3073 | (void) memcpy (&dip -> at_stride_size, diep, sizeof (long)); | |
3074 | break; | |
3075 | case AT_src_info: | |
3076 | (void) memcpy (&dip -> at_src_info, diep, sizeof (long)); | |
3077 | break; | |
3078 | case AT_prototyped: | |
3079 | (void) memcpy (&dip -> at_prototyped, diep, sizeof (short)); | |
3080 | break; | |
35f5886e FF |
3081 | default: |
3082 | /* Found an attribute that we are unprepared to handle. However | |
3083 | it is specifically one of the design goals of DWARF that | |
3084 | consumers should ignore unknown attributes. As long as the | |
3085 | form is one that we recognize (so we know how to skip it), | |
3086 | we can just ignore the unknown attribute. */ | |
3087 | break; | |
3088 | } | |
3089 | form = attr & 0xF; | |
3090 | switch (form) | |
3091 | { | |
3092 | case FORM_DATA2: | |
3093 | diep += sizeof (short); | |
3094 | break; | |
3095 | case FORM_DATA4: | |
3096 | diep += sizeof (long); | |
3097 | break; | |
3098 | case FORM_DATA8: | |
3099 | diep += 8 * sizeof (char); /* sizeof (long long) ? */ | |
3100 | break; | |
3101 | case FORM_ADDR: | |
3102 | case FORM_REF: | |
3103 | diep += sizeof (long); | |
3104 | break; | |
3105 | case FORM_BLOCK2: | |
3106 | (void) memcpy (&block2sz, diep, sizeof (short)); | |
3107 | block2sz += sizeof (short); | |
3108 | diep += block2sz; | |
3109 | break; | |
3110 | case FORM_BLOCK4: | |
3111 | (void) memcpy (&block4sz, diep, sizeof (long)); | |
3112 | block4sz += sizeof (long); | |
3113 | diep += block4sz; | |
3114 | break; | |
3115 | case FORM_STRING: | |
3116 | diep += strlen (diep) + 1; | |
3117 | break; | |
3118 | default: | |
3119 | SQUAWK (("unknown attribute form (0x%x), skipped rest", form)); | |
3120 | diep = end; | |
3121 | break; | |
3122 | } | |
3123 | } | |
3124 | } |