Line data Source code
1 : /* Interfaces for libdw.
2 : Copyright (C) 2002-2010, 2013, 2014, 2016, 2018 Red Hat, Inc.
3 : This file is part of elfutils.
4 :
5 : This file is free software; you can redistribute it and/or modify
6 : it under the terms of either
7 :
8 : * the GNU Lesser General Public License as published by the Free
9 : Software Foundation; either version 3 of the License, or (at
10 : your option) any later version
11 :
12 : or
13 :
14 : * the GNU General Public License as published by the Free
15 : Software Foundation; either version 2 of the License, or (at
16 : your option) any later version
17 :
18 : or both in parallel, as here.
19 :
20 : elfutils is distributed in the hope that it will be useful, but
21 : WITHOUT ANY WARRANTY; without even the implied warranty of
22 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 : General Public License for more details.
24 :
25 : You should have received copies of the GNU General Public License and
26 : the GNU Lesser General Public License along with this program. If
27 : not, see <http://www.gnu.org/licenses/>. */
28 :
29 : #ifndef _LIBDW_H
30 : #define _LIBDW_H 1
31 :
32 : #include <gelf.h>
33 : #include <stdbool.h>
34 : #include <stddef.h>
35 : #include <stdint.h>
36 :
37 : /* Mode for the session. */
38 : typedef enum
39 : {
40 : DWARF_C_READ, /* Read .. */
41 : DWARF_C_RDWR, /* Read and write .. */
42 : DWARF_C_WRITE, /* Write .. */
43 : }
44 : Dwarf_Cmd;
45 :
46 :
47 : /* Callback results. */
48 : enum
49 : {
50 : DWARF_CB_OK = 0,
51 : DWARF_CB_ABORT
52 : };
53 :
54 :
55 : /* Error values. */
56 : enum
57 : {
58 : DW_TAG_invalid = 0
59 : #define DW_TAG_invalid DW_TAG_invalid
60 : };
61 :
62 :
63 : /* Type for offset in DWARF file. */
64 : typedef GElf_Off Dwarf_Off;
65 :
66 : /* Type for address in DWARF file. */
67 : typedef GElf_Addr Dwarf_Addr;
68 :
69 : /* Integer types. Big enough to hold any numeric value. */
70 : typedef GElf_Xword Dwarf_Word;
71 : typedef GElf_Sxword Dwarf_Sword;
72 : /* For the times we know we do not need that much. */
73 : typedef GElf_Half Dwarf_Half;
74 :
75 :
76 : /* DWARF abbreviation record. */
77 : typedef struct Dwarf_Abbrev Dwarf_Abbrev;
78 :
79 : /* Returned to show the last DIE has be returned. */
80 : #define DWARF_END_ABBREV ((Dwarf_Abbrev *) -1l)
81 :
82 : /* Source code line information for CU. */
83 : typedef struct Dwarf_Lines_s Dwarf_Lines;
84 :
85 : /* One source code line information. */
86 : typedef struct Dwarf_Line_s Dwarf_Line;
87 :
88 : /* Source file information. */
89 : typedef struct Dwarf_Files_s Dwarf_Files;
90 :
91 : /* One address range record. */
92 : typedef struct Dwarf_Arange_s Dwarf_Arange;
93 :
94 : /* Address ranges of a file. */
95 : typedef struct Dwarf_Aranges_s Dwarf_Aranges;
96 :
97 : /* CU representation. */
98 : struct Dwarf_CU;
99 : typedef struct Dwarf_CU Dwarf_CU;
100 :
101 : /* Macro information. */
102 : typedef struct Dwarf_Macro_s Dwarf_Macro;
103 :
104 : /* Attribute representation. */
105 : typedef struct
106 : {
107 : unsigned int code;
108 : unsigned int form;
109 : unsigned char *valp;
110 : struct Dwarf_CU *cu;
111 : } Dwarf_Attribute;
112 :
113 :
114 : /* Data block representation. */
115 : typedef struct
116 : {
117 : Dwarf_Word length;
118 : unsigned char *data;
119 : } Dwarf_Block;
120 :
121 :
122 : /* DIE information. */
123 : typedef struct
124 : {
125 : /* The offset can be computed from the address. */
126 : void *addr;
127 : struct Dwarf_CU *cu;
128 : Dwarf_Abbrev *abbrev;
129 : // XXX We'll see what other information will be needed.
130 : long int padding__;
131 : } Dwarf_Die;
132 :
133 : /* Returned to show the last DIE has be returned. */
134 : #define DWARF_END_DIE ((Dwarf_Die *) -1l)
135 :
136 :
137 : /* Global symbol information. */
138 : typedef struct
139 : {
140 : Dwarf_Off cu_offset;
141 : Dwarf_Off die_offset;
142 : const char *name;
143 : } Dwarf_Global;
144 :
145 :
146 : /* One operation in a DWARF location expression.
147 : A location expression is an array of these. */
148 : typedef struct
149 : {
150 : uint8_t atom; /* Operation */
151 : Dwarf_Word number; /* Operand */
152 : Dwarf_Word number2; /* Possible second operand */
153 : Dwarf_Word offset; /* Offset in location expression */
154 : } Dwarf_Op;
155 :
156 :
157 : /* This describes one Common Information Entry read from a CFI section.
158 : Pointers here point into the DATA->d_buf block passed to dwarf_next_cfi. */
159 : typedef struct
160 : {
161 : Dwarf_Off CIE_id; /* Always DW_CIE_ID_64 in Dwarf_CIE structures. */
162 :
163 : /* Instruction stream describing initial state used by FDEs. If
164 : we did not understand the whole augmentation string and it did
165 : not use 'z', then there might be more augmentation data here
166 : (and in FDEs) before the actual instructions. */
167 : const uint8_t *initial_instructions;
168 : const uint8_t *initial_instructions_end;
169 :
170 : Dwarf_Word code_alignment_factor;
171 : Dwarf_Sword data_alignment_factor;
172 : Dwarf_Word return_address_register;
173 :
174 : const char *augmentation; /* Augmentation string. */
175 :
176 : /* Augmentation data, might be NULL. The size is correct only if
177 : we understood the augmentation string sufficiently. */
178 : const uint8_t *augmentation_data;
179 : size_t augmentation_data_size;
180 : size_t fde_augmentation_data_size;
181 : } Dwarf_CIE;
182 :
183 : /* This describes one Frame Description Entry read from a CFI section.
184 : Pointers here point into the DATA->d_buf block passed to dwarf_next_cfi. */
185 : typedef struct
186 : {
187 : /* Section offset of CIE this FDE refers to. This will never be
188 : DW_CIE_ID_64 in an FDE. If this value is DW_CIE_ID_64, this is
189 : actually a Dwarf_CIE structure. */
190 : Dwarf_Off CIE_pointer;
191 :
192 : /* We can't really decode anything further without looking up the CIE
193 : and checking its augmentation string. Here follows the encoded
194 : initial_location and address_range, then any augmentation data,
195 : then the instruction stream. This FDE describes PC locations in
196 : the byte range [initial_location, initial_location+address_range).
197 : When the CIE augmentation string uses 'z', the augmentation data is
198 : a DW_FORM_block (self-sized). Otherwise, when we understand the
199 : augmentation string completely, fde_augmentation_data_size gives
200 : the number of bytes of augmentation data before the instructions. */
201 : const uint8_t *start;
202 : const uint8_t *end;
203 : } Dwarf_FDE;
204 :
205 : /* Each entry in a CFI section is either a CIE described by Dwarf_CIE or
206 : an FDE described by Dward_FDE. Check CIE_id to see which you have. */
207 : typedef union
208 : {
209 : Dwarf_Off CIE_id; /* Always DW_CIE_ID_64 in Dwarf_CIE structures. */
210 : Dwarf_CIE cie;
211 : Dwarf_FDE fde;
212 : } Dwarf_CFI_Entry;
213 :
214 : /* Same as DW_CIE_ID_64 from dwarf.h to keep libdw.h independent. */
215 : #define LIBDW_CIE_ID 0xffffffffffffffffULL
216 : #define dwarf_cfi_cie_p(entry) ((entry)->cie.CIE_id == LIBDW_CIE_ID)
217 :
218 : /* Opaque type representing a frame state described by CFI. */
219 : typedef struct Dwarf_Frame_s Dwarf_Frame;
220 :
221 : /* Opaque type representing a CFI section found in a DWARF or ELF file. */
222 : typedef struct Dwarf_CFI_s Dwarf_CFI;
223 :
224 :
225 : /* Handle for debug sessions. */
226 : typedef struct Dwarf Dwarf;
227 :
228 :
229 : /* Out-Of-Memory handler. */
230 : typedef void (*__noreturn_attribute__ Dwarf_OOM) (void);
231 :
232 :
233 : #ifdef __cplusplus
234 : extern "C" {
235 : #endif
236 :
237 : /* Create a handle for a new debug session. */
238 : extern Dwarf *dwarf_begin (int fildes, Dwarf_Cmd cmd);
239 :
240 : /* Create a handle for a new debug session for an ELF file. */
241 : extern Dwarf *dwarf_begin_elf (Elf *elf, Dwarf_Cmd cmd, Elf_Scn *scngrp);
242 :
243 : /* Retrieve ELF descriptor used for DWARF access. */
244 : extern Elf *dwarf_getelf (Dwarf *dwarf);
245 :
246 : /* Retieve DWARF descriptor used for a Dwarf_Die or Dwarf_Attribute.
247 : A Dwarf_Die or a Dwarf_Attribute is associated with a particular
248 : Dwarf_CU handle. This function returns the DWARF descriptor for
249 : that Dwarf_CU. */
250 : extern Dwarf *dwarf_cu_getdwarf (Dwarf_CU *cu);
251 :
252 : /* Retrieves the DWARF descriptor for debugaltlink data. Returns NULL
253 : if no alternate debug data has been supplied yet. libdw will try
254 : to set the alt file on first use of an alt FORM if not yet explicitly
255 : provided by dwarf_setalt. */
256 : extern Dwarf *dwarf_getalt (Dwarf *main);
257 :
258 : /* Provides the data referenced by the .gnu_debugaltlink section. The
259 : caller should check that MAIN and ALT match (i.e., they have the
260 : same build ID). It is the responsibility of the caller to ensure
261 : that the data referenced by ALT stays valid while it is used by
262 : MAIN, until dwarf_setalt is called on MAIN with a different
263 : descriptor, or dwarf_end. Must be called before inspecting DIEs
264 : that might have alt FORMs. Otherwise libdw will try to set the
265 : alt file itself on first use. */
266 : extern void dwarf_setalt (Dwarf *main, Dwarf *alt);
267 :
268 : /* Release debugging handling context. */
269 : extern int dwarf_end (Dwarf *dwarf);
270 :
271 :
272 : /* Get the data block for the .debug_info section. */
273 : extern Elf_Data *dwarf_getscn_info (Dwarf *dwarf);
274 :
275 : /* Read the header for the DWARF CU. */
276 : extern int dwarf_nextcu (Dwarf *dwarf, Dwarf_Off off, Dwarf_Off *next_off,
277 : size_t *header_sizep, Dwarf_Off *abbrev_offsetp,
278 : uint8_t *address_sizep, uint8_t *offset_sizep)
279 : __nonnull_attribute__ (3);
280 :
281 : /* Read the header of a DWARF CU or type unit. If TYPE_SIGNATUREP is not
282 : null, this reads a type unit from the .debug_types section; otherwise
283 : this reads a CU from the .debug_info section. */
284 : extern int dwarf_next_unit (Dwarf *dwarf, Dwarf_Off off, Dwarf_Off *next_off,
285 : size_t *header_sizep, Dwarf_Half *versionp,
286 : Dwarf_Off *abbrev_offsetp,
287 : uint8_t *address_sizep, uint8_t *offset_sizep,
288 : uint64_t *type_signaturep, Dwarf_Off *type_offsetp)
289 : __nonnull_attribute__ (3);
290 :
291 :
292 : /* Gets the next Dwarf_CU (unit), version, unit type and if available
293 : the CU DIE and sub (type) DIE of the unit. Returns 0 on success,
294 : -1 on error or 1 if there are no more units. To start iterating
295 : provide NULL for CU. If version < 5 the unit type is set from the
296 : CU DIE if available (DW_UT_compile for DW_TAG_compile_unit,
297 : DW_UT_type for DW_TAG_type_unit or DW_UT_partial for
298 : DW_TAG_partial_unit), otherwise it is set to zero. If unavailable
299 : (the version or unit type is unknown) the CU DIE is cleared.
300 : Likewise if the sub DIE isn't isn't available (the unit type is not
301 : DW_UT_type or DW_UT_split_type) the sub DIE tag is cleared. */
302 : extern int dwarf_get_units (Dwarf *dwarf, Dwarf_CU *cu, Dwarf_CU **next_cu,
303 : Dwarf_Half *version, uint8_t *unit_type,
304 : Dwarf_Die *cudie, Dwarf_Die *subdie)
305 : __nonnull_attribute__ (3);
306 :
307 : /* Provides information and DIEs associated with the given Dwarf_CU
308 : unit. Returns -1 on error, zero on success. Arguments not needed
309 : may be NULL. If they are NULL and aren't known yet, they won't be
310 : looked up. If the subdie doesn't exist for this unit_type it will
311 : be cleared. If there is no unit_id for this unit type it will be
312 : set to zero. */
313 : extern int dwarf_cu_info (Dwarf_CU *cu,
314 : Dwarf_Half *version, uint8_t *unit_type,
315 : Dwarf_Die *cudie, Dwarf_Die *subdie,
316 : uint64_t *unit_id,
317 : uint8_t *address_size, uint8_t *offset_size);
318 :
319 : /* Decode one DWARF CFI entry (CIE or FDE) from the raw section data.
320 : The E_IDENT from the originating ELF file indicates the address
321 : size and byte order used in the CFI section contained in DATA;
322 : EH_FRAME_P should be true for .eh_frame format and false for
323 : .debug_frame format. OFFSET is the byte position in the section
324 : to start at; on return *NEXT_OFFSET is filled in with the byte
325 : position immediately after this entry.
326 :
327 : On success, returns 0 and fills in *ENTRY; use dwarf_cfi_cie_p to
328 : see whether ENTRY->cie or ENTRY->fde is valid.
329 :
330 : On errors, returns -1. Some format errors will permit safely
331 : skipping to the next CFI entry though the current one is unusable.
332 : In that case, *NEXT_OFF will be updated before a -1 return.
333 :
334 : If there are no more CFI entries left in the section,
335 : returns 1 and sets *NEXT_OFFSET to (Dwarf_Off) -1. */
336 : extern int dwarf_next_cfi (const unsigned char e_ident[],
337 : Elf_Data *data, bool eh_frame_p,
338 : Dwarf_Off offset, Dwarf_Off *next_offset,
339 : Dwarf_CFI_Entry *entry)
340 : __nonnull_attribute__ (1, 2, 5, 6);
341 :
342 : /* Use the CFI in the DWARF .debug_frame section.
343 : Returns NULL if there is no such section (not an error).
344 : The pointer returned can be used until dwarf_end is called on DWARF,
345 : and must not be passed to dwarf_cfi_end.
346 : Calling this more than once returns the same pointer. */
347 : extern Dwarf_CFI *dwarf_getcfi (Dwarf *dwarf);
348 :
349 : /* Use the CFI in the ELF file's exception-handling data.
350 : Returns NULL if there is no such data.
351 : The pointer returned can be used until elf_end is called on ELF,
352 : and must be passed to dwarf_cfi_end before then.
353 : Calling this more than once allocates independent data structures. */
354 : extern Dwarf_CFI *dwarf_getcfi_elf (Elf *elf);
355 :
356 : /* Release resources allocated by dwarf_getcfi_elf. */
357 : extern int dwarf_cfi_end (Dwarf_CFI *cache);
358 :
359 :
360 : /* Return DIE at given offset in .debug_info section. */
361 : extern Dwarf_Die *dwarf_offdie (Dwarf *dbg, Dwarf_Off offset,
362 : Dwarf_Die *result) __nonnull_attribute__ (3);
363 :
364 : /* Return DIE at given offset in .debug_types section. */
365 : extern Dwarf_Die *dwarf_offdie_types (Dwarf *dbg, Dwarf_Off offset,
366 : Dwarf_Die *result)
367 : __nonnull_attribute__ (3);
368 :
369 : /* Return offset of DIE. */
370 : extern Dwarf_Off dwarf_dieoffset (Dwarf_Die *die);
371 :
372 : /* Return offset of DIE in CU. */
373 : extern Dwarf_Off dwarf_cuoffset (Dwarf_Die *die);
374 :
375 : /* Return CU DIE containing given DIE. */
376 : extern Dwarf_Die *dwarf_diecu (Dwarf_Die *die, Dwarf_Die *result,
377 : uint8_t *address_sizep, uint8_t *offset_sizep)
378 : __nonnull_attribute__ (2);
379 :
380 : /* Given a Dwarf_Die addr returns a (reconstructed) Dwarf_Die, or NULL
381 : if the given addr didn't come from a valid Dwarf_Die. In particular
382 : it will make sure that the correct Dwarf_CU pointer is set for the
383 : Dwarf_Die, the Dwarf_Abbrev pointer will not be set up yet (it will
384 : only be once the Dwarf_Die is used to read attributes, children or
385 : siblings). This functions can be used to keep a reference to a
386 : Dwarf_Die which you want to refer to later. The addr, and the result
387 : of this function, is only valid while the associated Dwarf is valid. */
388 : extern Dwarf_Die *dwarf_die_addr_die (Dwarf *dbg, void *addr,
389 : Dwarf_Die *result)
390 : __nonnull_attribute__ (3);
391 :
392 : /* Return the CU DIE and the header info associated with a Dwarf_Die
393 : or Dwarf_Attribute. A Dwarf_Die or a Dwarf_Attribute is associated
394 : with a particular Dwarf_CU handle. This function returns the CU or
395 : type unit DIE and header information for that Dwarf_CU. The
396 : returned DIE is either a compile_unit, partial_unit or type_unit.
397 : If it is a type_unit, then the type signature and type offset are
398 : also provided, otherwise type_offset will be set to zero. See also
399 : dwarf_diecu and dwarf_next_unit. */
400 : extern Dwarf_Die *dwarf_cu_die (Dwarf_CU *cu, Dwarf_Die *result,
401 : Dwarf_Half *versionp,
402 : Dwarf_Off *abbrev_offsetp,
403 : uint8_t *address_sizep,
404 : uint8_t *offset_sizep,
405 : uint64_t *type_signaturep,
406 : Dwarf_Off *type_offsetp)
407 : __nonnull_attribute__ (2);
408 :
409 : /* Return CU DIE containing given address. */
410 : extern Dwarf_Die *dwarf_addrdie (Dwarf *dbg, Dwarf_Addr addr,
411 : Dwarf_Die *result) __nonnull_attribute__ (3);
412 :
413 : /* Return child of current DIE. */
414 : extern int dwarf_child (Dwarf_Die *die, Dwarf_Die *result)
415 : __nonnull_attribute__ (2);
416 :
417 : /* Locates the first sibling of DIE and places it in RESULT.
418 : Returns 0 if a sibling was found, -1 if something went wrong.
419 : Returns 1 if no sibling could be found and, if RESULT is not
420 : the same as DIE, it sets RESULT->addr to the address of the
421 : (non-sibling) DIE that follows this one, or NULL if this DIE
422 : was the last one in the compilation unit. */
423 : extern int dwarf_siblingof (Dwarf_Die *die, Dwarf_Die *result)
424 : __nonnull_attribute__ (2);
425 :
426 : /* For type aliases and qualifier type DIEs, which don't modify or
427 : change the structural layout of the underlying type, follow the
428 : DW_AT_type attribute (recursively) and return the underlying type
429 : Dwarf_Die.
430 :
431 : Returns 0 when RESULT contains a Dwarf_Die (possibly equal to the
432 : given DIE) that isn't a type alias or qualifier type. Returns 1
433 : when RESULT contains a type alias or qualifier Dwarf_Die that
434 : couldn't be peeled further (it doesn't have a DW_TAG_type
435 : attribute). Returns -1 when an error occured.
436 :
437 : The current DWARF specification defines one type alias tag
438 : (DW_TAG_typedef) and seven modifier/qualifier type tags
439 : (DW_TAG_const_type, DW_TAG_volatile_type, DW_TAG_restrict_type,
440 : DW_TAG_atomic_type, DW_TAG_immutable_type, DW_TAG_packed_type and
441 : DW_TAG_shared_type). This function won't peel modifier type
442 : tags that change the way the underlying type is accessed such
443 : as the pointer or reference type tags (DW_TAG_pointer_type,
444 : DW_TAG_reference_type or DW_TAG_rvalue_reference_type).
445 :
446 : A future version of this function might peel other alias or
447 : qualifier type tags if a future DWARF version or GNU extension
448 : defines other type aliases or qualifier type tags that don't modify,
449 : change the structural layout or the way to access the underlying type. */
450 : extern int dwarf_peel_type (Dwarf_Die *die, Dwarf_Die *result)
451 : __nonnull_attribute__ (2);
452 :
453 : /* Check whether the DIE has children. */
454 : extern int dwarf_haschildren (Dwarf_Die *die) __nonnull_attribute__ (1);
455 :
456 : /* Walks the attributes of DIE, starting at the one OFFSET bytes in,
457 : calling the CALLBACK function for each one. Stops if the callback
458 : function ever returns a value other than DWARF_CB_OK and returns the
459 : offset of the offending attribute. If the end of the attributes
460 : is reached 1 is returned. If something goes wrong -1 is returned and
461 : the dwarf error number is set. */
462 : extern ptrdiff_t dwarf_getattrs (Dwarf_Die *die,
463 : int (*callback) (Dwarf_Attribute *, void *),
464 : void *arg, ptrdiff_t offset)
465 : __nonnull_attribute__ (2);
466 :
467 : /* Return tag of given DIE. */
468 : extern int dwarf_tag (Dwarf_Die *die) __nonnull_attribute__ (1);
469 :
470 :
471 : /* Return specific attribute of DIE. */
472 : extern Dwarf_Attribute *dwarf_attr (Dwarf_Die *die, unsigned int search_name,
473 : Dwarf_Attribute *result)
474 : __nonnull_attribute__ (3);
475 :
476 : /* Check whether given DIE has specific attribute. */
477 : extern int dwarf_hasattr (Dwarf_Die *die, unsigned int search_name);
478 :
479 : /* These are the same as dwarf_attr and dwarf_hasattr, respectively,
480 : but they resolve an indirect attribute through DW_AT_abstract_origin. */
481 : extern Dwarf_Attribute *dwarf_attr_integrate (Dwarf_Die *die,
482 : unsigned int search_name,
483 : Dwarf_Attribute *result)
484 : __nonnull_attribute__ (3);
485 : extern int dwarf_hasattr_integrate (Dwarf_Die *die, unsigned int search_name);
486 :
487 :
488 :
489 :
490 : /* Check whether given attribute has specific form. */
491 : extern int dwarf_hasform (Dwarf_Attribute *attr, unsigned int search_form);
492 :
493 : /* Return attribute code of given attribute. */
494 : extern unsigned int dwarf_whatattr (Dwarf_Attribute *attr);
495 :
496 : /* Return form code of given attribute. */
497 : extern unsigned int dwarf_whatform (Dwarf_Attribute *attr);
498 :
499 :
500 : /* Return string associated with given attribute. */
501 : extern const char *dwarf_formstring (Dwarf_Attribute *attrp);
502 :
503 : /* Return unsigned constant represented by attribute. */
504 : extern int dwarf_formudata (Dwarf_Attribute *attr, Dwarf_Word *return_uval)
505 : __nonnull_attribute__ (2);
506 :
507 : /* Return signed constant represented by attribute. */
508 : extern int dwarf_formsdata (Dwarf_Attribute *attr, Dwarf_Sword *return_uval)
509 : __nonnull_attribute__ (2);
510 :
511 : /* Return address represented by attribute. */
512 : extern int dwarf_formaddr (Dwarf_Attribute *attr, Dwarf_Addr *return_addr)
513 : __nonnull_attribute__ (2);
514 :
515 : /* This function is deprecated. Always use dwarf_formref_die instead.
516 : Return reference offset represented by attribute. */
517 : extern int dwarf_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
518 : __nonnull_attribute__ (2) __deprecated_attribute__;
519 :
520 : /* Look up the DIE in a reference-form attribute. */
521 : extern Dwarf_Die *dwarf_formref_die (Dwarf_Attribute *attr, Dwarf_Die *die_mem)
522 : __nonnull_attribute__ (2);
523 :
524 : /* Return block represented by attribute. */
525 : extern int dwarf_formblock (Dwarf_Attribute *attr, Dwarf_Block *return_block)
526 : __nonnull_attribute__ (2);
527 :
528 : /* Return flag represented by attribute. */
529 : extern int dwarf_formflag (Dwarf_Attribute *attr, bool *return_bool)
530 : __nonnull_attribute__ (2);
531 :
532 :
533 : /* Simplified attribute value access functions. */
534 :
535 : /* Return string in name attribute of DIE. */
536 : extern const char *dwarf_diename (Dwarf_Die *die);
537 :
538 : /* Return high PC attribute of DIE. */
539 : extern int dwarf_highpc (Dwarf_Die *die, Dwarf_Addr *return_addr)
540 : __nonnull_attribute__ (2);
541 :
542 : /* Return low PC attribute of DIE. */
543 : extern int dwarf_lowpc (Dwarf_Die *die, Dwarf_Addr *return_addr)
544 : __nonnull_attribute__ (2);
545 :
546 : /* Return entry_pc or low_pc attribute of DIE. */
547 : extern int dwarf_entrypc (Dwarf_Die *die, Dwarf_Addr *return_addr)
548 : __nonnull_attribute__ (2);
549 :
550 : /* Return 1 if DIE's lowpc/highpc or ranges attributes match the PC address,
551 : 0 if not, or -1 for errors. */
552 : extern int dwarf_haspc (Dwarf_Die *die, Dwarf_Addr pc);
553 :
554 : /* Enumerate the PC address ranges covered by this DIE, covering all
555 : addresses where dwarf_haspc returns true. In the first call OFFSET
556 : should be zero and *BASEP need not be initialized. Returns -1 for
557 : errors, zero when there are no more address ranges to report, or a
558 : nonzero OFFSET value to pass to the next call. Each subsequent call
559 : must preserve *BASEP from the prior call. Successful calls fill in
560 : *STARTP and *ENDP with a contiguous address range. */
561 : extern ptrdiff_t dwarf_ranges (Dwarf_Die *die,
562 : ptrdiff_t offset, Dwarf_Addr *basep,
563 : Dwarf_Addr *startp, Dwarf_Addr *endp);
564 :
565 :
566 : /* Return byte size attribute of DIE. */
567 : extern int dwarf_bytesize (Dwarf_Die *die);
568 :
569 : /* Return bit size attribute of DIE. */
570 : extern int dwarf_bitsize (Dwarf_Die *die);
571 :
572 : /* Return bit offset attribute of DIE. */
573 : extern int dwarf_bitoffset (Dwarf_Die *die);
574 :
575 : /* Return array order attribute of DIE. */
576 : extern int dwarf_arrayorder (Dwarf_Die *die);
577 :
578 : /* Return source language attribute of DIE. */
579 : extern int dwarf_srclang (Dwarf_Die *die);
580 :
581 :
582 : /* Get abbreviation at given offset for given DIE. */
583 : extern Dwarf_Abbrev *dwarf_getabbrev (Dwarf_Die *die, Dwarf_Off offset,
584 : size_t *lengthp);
585 :
586 : /* Get abbreviation at given offset in .debug_abbrev section. */
587 : extern int dwarf_offabbrev (Dwarf *dbg, Dwarf_Off offset, size_t *lengthp,
588 : Dwarf_Abbrev *abbrevp)
589 : __nonnull_attribute__ (4);
590 :
591 : /* Get abbreviation code. */
592 : extern unsigned int dwarf_getabbrevcode (Dwarf_Abbrev *abbrev);
593 :
594 : /* Get abbreviation tag. */
595 : extern unsigned int dwarf_getabbrevtag (Dwarf_Abbrev *abbrev);
596 :
597 : /* Return true if abbreviation is children flag set. */
598 : extern int dwarf_abbrevhaschildren (Dwarf_Abbrev *abbrev);
599 :
600 : /* Get number of attributes of abbreviation. */
601 : extern int dwarf_getattrcnt (Dwarf_Abbrev *abbrev, size_t *attrcntp)
602 : __nonnull_attribute__ (2);
603 :
604 : /* Get specific attribute of abbreviation. */
605 : extern int dwarf_getabbrevattr (Dwarf_Abbrev *abbrev, size_t idx,
606 : unsigned int *namep, unsigned int *formp,
607 : Dwarf_Off *offset);
608 :
609 : /* Get specific attribute of abbreviation and any data encoded with it.
610 : Specifically for DW_FORM_implicit_const data will be set to the
611 : constant value associated. */
612 : extern int dwarf_getabbrevattr_data (Dwarf_Abbrev *abbrev, size_t idx,
613 : unsigned int *namep, unsigned int *formp,
614 : Dwarf_Sword *datap, Dwarf_Off *offset);
615 :
616 : /* Get string from-debug_str section. */
617 : extern const char *dwarf_getstring (Dwarf *dbg, Dwarf_Off offset,
618 : size_t *lenp);
619 :
620 :
621 : /* Get public symbol information. */
622 : extern ptrdiff_t dwarf_getpubnames (Dwarf *dbg,
623 : int (*callback) (Dwarf *, Dwarf_Global *,
624 : void *),
625 : void *arg, ptrdiff_t offset)
626 : __nonnull_attribute__ (2);
627 :
628 :
629 : /* Get source file information for CU. */
630 : extern int dwarf_getsrclines (Dwarf_Die *cudie, Dwarf_Lines **lines,
631 : size_t *nlines) __nonnull_attribute__ (2, 3);
632 :
633 : /* Return one of the source lines of the CU. */
634 : extern Dwarf_Line *dwarf_onesrcline (Dwarf_Lines *lines, size_t idx);
635 :
636 : /* Get the file source files used in the CU. */
637 : extern int dwarf_getsrcfiles (Dwarf_Die *cudie, Dwarf_Files **files,
638 : size_t *nfiles)
639 : __nonnull_attribute__ (2);
640 :
641 :
642 : /* Get source for address in CU. */
643 : extern Dwarf_Line *dwarf_getsrc_die (Dwarf_Die *cudie, Dwarf_Addr addr);
644 :
645 : /* Get source for file and line number. */
646 : extern int dwarf_getsrc_file (Dwarf *dbg, const char *fname, int line, int col,
647 : Dwarf_Line ***srcsp, size_t *nsrcs)
648 : __nonnull_attribute__ (2, 5, 6);
649 :
650 :
651 : /* Return line address. */
652 : extern int dwarf_lineaddr (Dwarf_Line *line, Dwarf_Addr *addrp);
653 :
654 : /* Return line VLIW operation index. */
655 : extern int dwarf_lineop_index (Dwarf_Line *line, unsigned int *op_indexp);
656 :
657 : /* Return line number. */
658 : extern int dwarf_lineno (Dwarf_Line *line, int *linep)
659 : __nonnull_attribute__ (2);
660 :
661 : /* Return column in line. */
662 : extern int dwarf_linecol (Dwarf_Line *line, int *colp)
663 : __nonnull_attribute__ (2);
664 :
665 : /* Return true if record is for beginning of a statement. */
666 : extern int dwarf_linebeginstatement (Dwarf_Line *line, bool *flagp)
667 : __nonnull_attribute__ (2);
668 :
669 : /* Return true if record is for end of sequence. */
670 : extern int dwarf_lineendsequence (Dwarf_Line *line, bool *flagp)
671 : __nonnull_attribute__ (2);
672 :
673 : /* Return true if record is for beginning of a basic block. */
674 : extern int dwarf_lineblock (Dwarf_Line *line, bool *flagp)
675 : __nonnull_attribute__ (2);
676 :
677 : /* Return true if record is for end of prologue. */
678 : extern int dwarf_lineprologueend (Dwarf_Line *line, bool *flagp)
679 : __nonnull_attribute__ (2);
680 :
681 : /* Return true if record is for beginning of epilogue. */
682 : extern int dwarf_lineepiloguebegin (Dwarf_Line *line, bool *flagp)
683 : __nonnull_attribute__ (2);
684 :
685 : /* Return instruction-set architecture in this record. */
686 : extern int dwarf_lineisa (Dwarf_Line *line, unsigned int *isap)
687 : __nonnull_attribute__ (2);
688 :
689 : /* Return code path discriminator in this record. */
690 : extern int dwarf_linediscriminator (Dwarf_Line *line, unsigned int *discp)
691 : __nonnull_attribute__ (2);
692 :
693 :
694 : /* Find line information for address. The returned string is NULL when
695 : an error occured, or the file path. The file path is either absolute
696 : or relative to the compilation directory. See dwarf_decl_file. */
697 : extern const char *dwarf_linesrc (Dwarf_Line *line,
698 : Dwarf_Word *mtime, Dwarf_Word *length);
699 :
700 : /* Return file information. The returned string is NULL when
701 : an error occured, or the file path. The file path is either absolute
702 : or relative to the compilation directory. See dwarf_decl_file. */
703 : extern const char *dwarf_filesrc (Dwarf_Files *file, size_t idx,
704 : Dwarf_Word *mtime, Dwarf_Word *length);
705 :
706 : /* Return the Dwarf_Files and index associated with the given Dwarf_Line. */
707 : extern int dwarf_line_file (Dwarf_Line *line,
708 : Dwarf_Files **files, size_t *idx)
709 : __nonnull_attribute__ (2, 3);
710 :
711 : /* Return the directory list used in the file information extracted.
712 : (*RESULT)[0] is the CU's DW_AT_comp_dir value, and may be null.
713 : (*RESULT)[0..*NDIRS-1] are the compile-time include directory path
714 : encoded by the compiler. */
715 : extern int dwarf_getsrcdirs (Dwarf_Files *files,
716 : const char *const **result, size_t *ndirs)
717 : __nonnull_attribute__ (2, 3);
718 :
719 :
720 : /* Return location expression, decoded as a list of operations. */
721 : extern int dwarf_getlocation (Dwarf_Attribute *attr, Dwarf_Op **expr,
722 : size_t *exprlen) __nonnull_attribute__ (2, 3);
723 :
724 : /* Return location expressions. If the attribute uses a location list,
725 : ADDRESS selects the relevant location expressions from the list.
726 : There can be multiple matches, resulting in multiple expressions to
727 : return. EXPRS and EXPRLENS are parallel arrays of NLOCS slots to
728 : fill in. Returns the number of locations filled in, or -1 for
729 : errors. If EXPRS is a null pointer, stores nothing and returns the
730 : total number of locations. A return value of zero means that the
731 : location list indicated no value is accessible. */
732 : extern int dwarf_getlocation_addr (Dwarf_Attribute *attr, Dwarf_Addr address,
733 : Dwarf_Op **exprs, size_t *exprlens,
734 : size_t nlocs);
735 :
736 : /* Enumerate the locations ranges and descriptions covered by the
737 : given attribute. In the first call OFFSET should be zero and
738 : *BASEP need not be initialized. Returns -1 for errors, zero when
739 : there are no more locations to report, or a nonzero OFFSET
740 : value to pass to the next call. Each subsequent call must preserve
741 : *BASEP from the prior call. Successful calls fill in *STARTP and
742 : *ENDP with a contiguous address range and *EXPR with a pointer to
743 : an array of operations with length *EXPRLEN. If the attribute
744 : describes a single location description and not a location list the
745 : first call (with OFFSET zero) will return the location description
746 : in *EXPR with *STARTP set to zero and *ENDP set to minus one. */
747 : extern ptrdiff_t dwarf_getlocations (Dwarf_Attribute *attr,
748 : ptrdiff_t offset, Dwarf_Addr *basep,
749 : Dwarf_Addr *startp, Dwarf_Addr *endp,
750 : Dwarf_Op **expr, size_t *exprlen);
751 :
752 : /* Return the block associated with a DW_OP_implicit_value operation.
753 : The OP pointer must point into an expression that dwarf_getlocation
754 : or dwarf_getlocation_addr has returned given the same ATTR. */
755 : extern int dwarf_getlocation_implicit_value (Dwarf_Attribute *attr,
756 : const Dwarf_Op *op,
757 : Dwarf_Block *return_block)
758 : __nonnull_attribute__ (2, 3);
759 :
760 : /* Return the attribute indicated by a DW_OP_GNU_implicit_pointer operation.
761 : The OP pointer must point into an expression that dwarf_getlocation
762 : or dwarf_getlocation_addr has returned given the same ATTR.
763 : The result is the DW_AT_location or DW_AT_const_value attribute
764 : of the OP->number DIE. */
765 : extern int dwarf_getlocation_implicit_pointer (Dwarf_Attribute *attr,
766 : const Dwarf_Op *op,
767 : Dwarf_Attribute *result)
768 : __nonnull_attribute__ (2, 3);
769 :
770 : /* Return the DIE associated with an operation such as
771 : DW_OP_GNU_implicit_pointer, DW_OP_GNU_parameter_ref, DW_OP_GNU_convert,
772 : DW_OP_GNU_reinterpret, DW_OP_GNU_const_type, DW_OP_GNU_regval_type or
773 : DW_OP_GNU_deref_type. The OP pointer must point into an expression that
774 : dwarf_getlocation or dwarf_getlocation_addr has returned given the same
775 : ATTR. The RESULT is a DIE that expresses a type or value needed by the
776 : given OP. */
777 : extern int dwarf_getlocation_die (Dwarf_Attribute *attr,
778 : const Dwarf_Op *op,
779 : Dwarf_Die *result)
780 : __nonnull_attribute__ (2, 3);
781 :
782 : /* Return the attribute expressing a value associated with an operation such
783 : as DW_OP_implicit_value, DW_OP_GNU_entry_value or DW_OP_GNU_const_type.
784 : The OP pointer must point into an expression that dwarf_getlocation
785 : or dwarf_getlocation_addr has returned given the same ATTR.
786 : The RESULT is a value expressed by an attribute such as DW_AT_location
787 : or DW_AT_const_value. */
788 : extern int dwarf_getlocation_attr (Dwarf_Attribute *attr,
789 : const Dwarf_Op *op,
790 : Dwarf_Attribute *result)
791 : __nonnull_attribute__ (2, 3);
792 :
793 :
794 : /* Compute the byte-size of a type DIE according to DWARF rules.
795 : For most types, this is just DW_AT_byte_size.
796 : For DW_TAG_array_type it can apply much more complex rules. */
797 : extern int dwarf_aggregate_size (Dwarf_Die *die, Dwarf_Word *size);
798 :
799 : /* Given a language code, as returned by dwarf_srclan, get the default
800 : lower bound for a subrange type without a lower bound attribute.
801 : Returns zero on success or -1 on failure when the given language
802 : wasn't recognized. */
803 : extern int dwarf_default_lower_bound (int lang, Dwarf_Sword *result)
804 : __nonnull_attribute__ (2);
805 :
806 : /* Return scope DIEs containing PC address.
807 : Sets *SCOPES to a malloc'd array of Dwarf_Die structures,
808 : and returns the number of elements in the array.
809 : (*SCOPES)[0] is the DIE for the innermost scope containing PC,
810 : (*SCOPES)[1] is the DIE for the scope containing that scope, and so on.
811 : Returns -1 for errors or 0 if no scopes match PC. */
812 : extern int dwarf_getscopes (Dwarf_Die *cudie, Dwarf_Addr pc,
813 : Dwarf_Die **scopes);
814 :
815 : /* Return scope DIEs containing the given DIE.
816 : Sets *SCOPES to a malloc'd array of Dwarf_Die structures,
817 : and returns the number of elements in the array.
818 : (*SCOPES)[0] is a copy of DIE.
819 : (*SCOPES)[1] is the DIE for the scope containing that scope, and so on.
820 : Returns -1 for errors or 0 if DIE is not found in any scope entry. */
821 : extern int dwarf_getscopes_die (Dwarf_Die *die, Dwarf_Die **scopes);
822 :
823 :
824 : /* Search SCOPES[0..NSCOPES-1] for a variable called NAME.
825 : Ignore the first SKIP_SHADOWS scopes that match the name.
826 : If MATCH_FILE is not null, accept only declaration in that source file;
827 : if MATCH_LINENO or MATCH_LINECOL are also nonzero, accept only declaration
828 : at that line and column.
829 :
830 : If successful, fill in *RESULT with the DIE of the variable found,
831 : and return N where SCOPES[N] is the scope defining the variable.
832 : Return -1 for errors or -2 for no matching variable found. */
833 : extern int dwarf_getscopevar (Dwarf_Die *scopes, int nscopes,
834 : const char *name, int skip_shadows,
835 : const char *match_file,
836 : int match_lineno, int match_linecol,
837 : Dwarf_Die *result);
838 :
839 :
840 :
841 : /* Return list address ranges. */
842 : extern int dwarf_getaranges (Dwarf *dbg, Dwarf_Aranges **aranges,
843 : size_t *naranges)
844 : __nonnull_attribute__ (2);
845 :
846 : /* Return one of the address range entries. */
847 : extern Dwarf_Arange *dwarf_onearange (Dwarf_Aranges *aranges, size_t idx);
848 :
849 : /* Return information in address range record. */
850 : extern int dwarf_getarangeinfo (Dwarf_Arange *arange, Dwarf_Addr *addrp,
851 : Dwarf_Word *lengthp, Dwarf_Off *offsetp);
852 :
853 : /* Get address range which includes given address. */
854 : extern Dwarf_Arange *dwarf_getarange_addr (Dwarf_Aranges *aranges,
855 : Dwarf_Addr addr);
856 :
857 :
858 :
859 : /* Get functions in CUDIE. The given callback will be called for all
860 : defining DW_TAG_subprograms in the CU DIE tree. If the callback
861 : returns DWARF_CB_ABORT the return value can be used as offset argument
862 : to resume the function to find all remaining functions (this is not
863 : really recommended, since it needs to rewalk the CU DIE tree first till
864 : that offset is found again). If the callback returns DWARF_CB_OK
865 : dwarf_getfuncs will not return but keep calling the callback for each
866 : function DIE it finds. Pass zero for offset on the first call to walk
867 : the full CU DIE tree. If no more functions can be found and the callback
868 : returned DWARF_CB_OK then the function returns zero. */
869 : extern ptrdiff_t dwarf_getfuncs (Dwarf_Die *cudie,
870 : int (*callback) (Dwarf_Die *, void *),
871 : void *arg, ptrdiff_t offset);
872 :
873 :
874 : /* Return file name containing definition of the given declaration.
875 : Of the DECL has an (indirect, see dwarf_attr_integrate) decl_file
876 : attribute. The returned file path is either absolute, or relative
877 : to the compilation directory. Given the decl DIE, the compilation
878 : directory can be retrieved through:
879 : dwarf_formstring (dwarf_attr (dwarf_diecu (decl, &cudie, NULL, NULL),
880 : DW_AT_comp_dir, &attr));
881 : Returns NULL if no decl_file could be found or an error occured. */
882 : extern const char *dwarf_decl_file (Dwarf_Die *decl);
883 :
884 : /* Get line number of beginning of given declaration. */
885 : extern int dwarf_decl_line (Dwarf_Die *decl, int *linep)
886 : __nonnull_attribute__ (2);
887 :
888 : /* Get column number of beginning of given declaration. */
889 : extern int dwarf_decl_column (Dwarf_Die *decl, int *colp)
890 : __nonnull_attribute__ (2);
891 :
892 :
893 : /* Return nonzero if given function is an abstract inline definition. */
894 : extern int dwarf_func_inline (Dwarf_Die *func);
895 :
896 : /* Find each concrete inlined instance of the abstract inline definition. */
897 : extern int dwarf_func_inline_instances (Dwarf_Die *func,
898 : int (*callback) (Dwarf_Die *, void *),
899 : void *arg);
900 :
901 :
902 : /* Find the appropriate PC location or locations for function entry
903 : breakpoints for the given DW_TAG_subprogram DIE. Returns -1 for errors.
904 : On success, returns the number of breakpoint locations (never zero)
905 : and sets *BKPTS to a malloc'd vector of addresses. */
906 : extern int dwarf_entry_breakpoints (Dwarf_Die *die, Dwarf_Addr **bkpts);
907 :
908 :
909 : /* Iterate through the macro unit referenced by CUDIE and call
910 : CALLBACK for each macro information entry. To start the iteration,
911 : one would pass DWARF_GETMACROS_START for TOKEN.
912 :
913 : The iteration continues while CALLBACK returns DWARF_CB_OK. If the
914 : callback returns DWARF_CB_ABORT, the iteration stops and a
915 : continuation token is returned, which can be used to restart the
916 : iteration at the point where it ended. Returns -1 for errors or 0
917 : if there are no more macro entries.
918 :
919 : Note that the Dwarf_Macro pointer passed to the callback is only
920 : valid for the duration of the callback invocation.
921 :
922 : For backward compatibility, a token of 0 is accepted for starting
923 : the iteration as well, but in that case this interface will refuse
924 : to serve opcode 0xff from .debug_macro sections. Such opcode would
925 : be considered invalid and would cause dwarf_getmacros to return
926 : with error. */
927 : #define DWARF_GETMACROS_START PTRDIFF_MIN
928 : extern ptrdiff_t dwarf_getmacros (Dwarf_Die *cudie,
929 : int (*callback) (Dwarf_Macro *, void *),
930 : void *arg, ptrdiff_t token)
931 : __nonnull_attribute__ (2);
932 :
933 : /* This is similar in operation to dwarf_getmacros, but selects the
934 : unit to iterate through by offset instead of by CU, and always
935 : iterates .debug_macro. This can be used for handling
936 : DW_MACRO_GNU_transparent_include's or similar opcodes.
937 :
938 : TOKEN value of DWARF_GETMACROS_START can be used to start the
939 : iteration.
940 :
941 : It is not appropriate to obtain macro unit offset by hand from a CU
942 : DIE and then request iteration through this interface. The reason
943 : for this is that if a dwarf_macro_getsrcfiles is later called,
944 : there would be no way to figure out what DW_AT_comp_dir was present
945 : on the CU DIE, and file names referenced in either the macro unit
946 : itself, or the .debug_line unit that it references, might be wrong.
947 : Use dwarf_getmacros. */
948 : extern ptrdiff_t dwarf_getmacros_off (Dwarf *dbg, Dwarf_Off macoff,
949 : int (*callback) (Dwarf_Macro *, void *),
950 : void *arg, ptrdiff_t token)
951 : __nonnull_attribute__ (3);
952 :
953 : /* Get the source files used by the macro entry. You shouldn't assume
954 : that Dwarf_Files references will remain valid after MACRO becomes
955 : invalid. (Which is to say it's only valid within the
956 : dwarf_getmacros* callback.) Returns 0 for success or a negative
957 : value in case of an error. */
958 : extern int dwarf_macro_getsrcfiles (Dwarf *dbg, Dwarf_Macro *macro,
959 : Dwarf_Files **files, size_t *nfiles)
960 : __nonnull_attribute__ (2, 3, 4);
961 :
962 : /* Return macro opcode. That's a constant that can be either from
963 : DW_MACINFO_* domain or DW_MACRO_GNU_* domain. The two domains have
964 : compatible values, so it's OK to use either of them for
965 : comparisons. The only differences is 0xff, which could be either
966 : DW_MACINFO_vendor_ext or a vendor-defined DW_MACRO_* constant. One
967 : would need to look if the CU DIE which the iteration was requested
968 : for has attribute DW_AT_macro_info, or either of DW_AT_GNU_macros
969 : or DW_AT_macros to differentiate the two interpretations. */
970 : extern int dwarf_macro_opcode (Dwarf_Macro *macro, unsigned int *opcodep)
971 : __nonnull_attribute__ (2);
972 :
973 : /* Get number of parameters of MACRO and store it to *PARAMCNTP. */
974 : extern int dwarf_macro_getparamcnt (Dwarf_Macro *macro, size_t *paramcntp);
975 :
976 : /* Get IDX-th parameter of MACRO (numbered from zero), and stores it
977 : to *ATTRIBUTE. Returns 0 on success or -1 for errors.
978 :
979 : After a successful call, you can query ATTRIBUTE by dwarf_whatform
980 : to determine which of the dwarf_formX calls to make to get actual
981 : value out of ATTRIBUTE. Note that calling dwarf_whatattr is not
982 : meaningful for pseudo-attributes formed this way. */
983 : extern int dwarf_macro_param (Dwarf_Macro *macro, size_t idx,
984 : Dwarf_Attribute *attribute);
985 :
986 : /* Return macro parameter with index 0. This will return -1 if the
987 : parameter is not an integral value. Use dwarf_macro_param for more
988 : general access. */
989 : extern int dwarf_macro_param1 (Dwarf_Macro *macro, Dwarf_Word *paramp)
990 : __nonnull_attribute__ (2);
991 :
992 : /* Return macro parameter with index 1. This will return -1 if the
993 : parameter is not an integral or string value. Use
994 : dwarf_macro_param for more general access. */
995 : extern int dwarf_macro_param2 (Dwarf_Macro *macro, Dwarf_Word *paramp,
996 : const char **strp);
997 :
998 : /* Compute what's known about a call frame when the PC is at ADDRESS.
999 : Returns 0 for success or -1 for errors.
1000 : On success, *FRAME is a malloc'd pointer. */
1001 : extern int dwarf_cfi_addrframe (Dwarf_CFI *cache,
1002 : Dwarf_Addr address, Dwarf_Frame **frame)
1003 : __nonnull_attribute__ (3);
1004 :
1005 : /* Return the DWARF register number used in FRAME to denote
1006 : the return address in FRAME's caller frame. The remaining
1007 : arguments can be non-null to fill in more information.
1008 :
1009 : Fill [*START, *END) with the PC range to which FRAME's information applies.
1010 : Fill in *SIGNALP to indicate whether this is a signal-handling frame.
1011 : If true, this is the implicit call frame that calls a signal handler.
1012 : This frame's "caller" is actually the interrupted state, not a call;
1013 : its return address is an exact PC, not a PC after a call instruction. */
1014 : extern int dwarf_frame_info (Dwarf_Frame *frame,
1015 : Dwarf_Addr *start, Dwarf_Addr *end, bool *signalp);
1016 :
1017 : /* Return a DWARF expression that yields the Canonical Frame Address at
1018 : this frame state. Returns -1 for errors, or zero for success, with
1019 : *NOPS set to the number of operations stored at *OPS. That pointer
1020 : can be used only as long as FRAME is alive and unchanged. *NOPS is
1021 : zero if the CFA cannot be determined here. Note that if nonempty,
1022 : *OPS is a DWARF expression, not a location description--append
1023 : DW_OP_stack_value to a get a location description for the CFA. */
1024 : extern int dwarf_frame_cfa (Dwarf_Frame *frame, Dwarf_Op **ops, size_t *nops)
1025 : __nonnull_attribute__ (2);
1026 :
1027 : /* Deliver a DWARF location description that yields the location or
1028 : value of DWARF register number REGNO in the state described by FRAME.
1029 :
1030 : Returns -1 for errors or zero for success, setting *NOPS to the
1031 : number of operations in the array stored at *OPS. Note the last
1032 : operation is DW_OP_stack_value if there is no mutable location but
1033 : only a computable value.
1034 :
1035 : *NOPS zero with *OPS set to OPS_MEM means CFI says the caller's
1036 : REGNO is "undefined", i.e. it's call-clobbered and cannot be recovered.
1037 :
1038 : *NOPS zero with *OPS set to a null pointer means CFI says the
1039 : caller's REGNO is "same_value", i.e. this frame did not change it;
1040 : ask the caller frame where to find it.
1041 :
1042 : For common simple expressions *OPS is OPS_MEM. For arbitrary DWARF
1043 : expressions in the CFI, *OPS is an internal pointer that can be used as
1044 : long as the Dwarf_CFI used to create FRAME remains alive. */
1045 : extern int dwarf_frame_register (Dwarf_Frame *frame, int regno,
1046 : Dwarf_Op ops_mem[3],
1047 : Dwarf_Op **ops, size_t *nops)
1048 : __nonnull_attribute__ (3, 4, 5);
1049 :
1050 :
1051 : /* Return error code of last failing function call. This value is kept
1052 : separately for each thread. */
1053 : extern int dwarf_errno (void);
1054 :
1055 : /* Return error string for ERROR. If ERROR is zero, return error string
1056 : for most recent error or NULL is none occurred. If ERROR is -1 the
1057 : behaviour is similar to the last case except that not NULL but a legal
1058 : string is returned. */
1059 : extern const char *dwarf_errmsg (int err);
1060 :
1061 :
1062 : /* Register new Out-Of-Memory handler. The old handler is returned. */
1063 : extern Dwarf_OOM dwarf_new_oom_handler (Dwarf *dbg, Dwarf_OOM handler);
1064 :
1065 :
1066 : /* Inline optimizations. */
1067 : #ifdef __OPTIMIZE__
1068 : /* Return attribute code of given attribute. */
1069 : __libdw_extern_inline unsigned int
1070 : dwarf_whatattr (Dwarf_Attribute *attr)
1071 : {
1072 2451568 : return attr == NULL ? 0 : attr->code;
1073 : }
1074 :
1075 : /* Return attribute code of given attribute. */
1076 : __libdw_extern_inline unsigned int
1077 : dwarf_whatform (Dwarf_Attribute *attr)
1078 : {
1079 6441169 : return attr == NULL ? 0 : attr->form;
1080 : }
1081 : #endif /* Optimize. */
1082 :
1083 : #ifdef __cplusplus
1084 : }
1085 : #endif
1086 :
1087 : #endif /* libdw.h */
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