1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2020 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include <unordered_map>
25 #include "dwarf2/comp-unit.h"
26 #include "dwarf2/index-cache.h"
27 #include "dwarf2/section.h"
28 #include "filename-seen-cache.h"
29 #include "gdb_obstack.h"
30 #include "gdbsupport/hash_enum.h"
33 /* Hold 'maintenance (set|show) dwarf' commands. */
34 extern struct cmd_list_element
*set_dwarf_cmdlist
;
35 extern struct cmd_list_element
*show_dwarf_cmdlist
;
39 int nr_uniq_abbrev_tables
;
41 int nr_symtab_sharers
;
42 int nr_stmt_less_type_units
;
43 int nr_all_type_units_reallocs
;
47 struct dwarf2_debug_sections
;
48 struct dwarf2_per_cu_data
;
50 struct mapped_debug_names
;
51 struct signatured_type
;
52 struct type_unit_group
;
54 /* One item on the queue of compilation units to read in full symbols
56 struct dwarf2_queue_item
58 dwarf2_queue_item (dwarf2_per_cu_data
*cu
, dwarf2_per_objfile
*per_objfile
,
61 per_objfile (per_objfile
),
62 pretend_language (lang
)
66 ~dwarf2_queue_item ();
68 DISABLE_COPY_AND_ASSIGN (dwarf2_queue_item
);
70 dwarf2_per_cu_data
*per_cu
;
71 dwarf2_per_objfile
*per_objfile
;
72 enum language pretend_language
;
75 /* Some DWARF data can be shared across objfiles who share the same BFD,
76 this data is stored in this object.
78 Two dwarf2_per_objfile objects representing objfiles sharing the same BFD
79 will point to the same instance of dwarf2_per_bfd, unless the BFD requires
84 /* Construct a dwarf2_per_bfd for OBFD. NAMES points to the
85 dwarf2 section names, or is NULL if the standard ELF names are
86 used. CAN_COPY is true for formats where symbol
87 interposition is possible and so symbol values must follow copy
89 dwarf2_per_bfd (bfd
*obfd
, const dwarf2_debug_sections
*names
, bool can_copy
);
93 DISABLE_COPY_AND_ASSIGN (dwarf2_per_bfd
);
95 /* Return the CU/TU given its index.
97 This is intended for loops like:
99 for (i = 0; i < (dwarf2_per_bfd->n_comp_units
100 + dwarf2_per_bfd->n_type_units); ++i)
102 dwarf2_per_cu_data *per_cu = dwarf2_per_bfd->get_cutu (i);
107 dwarf2_per_cu_data
*get_cutu (int index
);
109 /* Return the CU given its index.
110 This differs from get_cutu in that it's for when you know INDEX refers to a
112 dwarf2_per_cu_data
*get_cu (int index
);
114 /* Return the TU given its index.
115 This differs from get_cutu in that it's for when you know INDEX refers to a
117 signatured_type
*get_tu (int index
);
119 /* A convenience function to allocate a dwarf2_per_cu_data. The
120 returned object has its "index" field set properly. The object
121 is allocated on the dwarf2_per_bfd obstack. */
122 dwarf2_per_cu_data
*allocate_per_cu ();
124 /* A convenience function to allocate a signatured_type. The
125 returned object has its "index" field set properly. The object
126 is allocated on the dwarf2_per_bfd obstack. */
127 signatured_type
*allocate_signatured_type ();
129 /* Return the number of partial symtabs allocated with allocate_per_cu
130 and allocate_signatured_type so far. */
131 int num_psymtabs () const
132 { return m_num_psymtabs
; }
135 /* This function is mapped across the sections and remembers the
136 offset and size of each of the debugging sections we are
138 void locate_sections (bfd
*abfd
, asection
*sectp
,
139 const dwarf2_debug_sections
&names
);
142 /* The corresponding BFD. */
145 /* Objects that can be shared across objfiles are stored in this
146 obstack or on the psymtab obstack, while objects that are
147 objfile-specific are stored on the objfile obstack. */
148 auto_obstack obstack
;
150 dwarf2_section_info info
{};
151 dwarf2_section_info abbrev
{};
152 dwarf2_section_info line
{};
153 dwarf2_section_info loc
{};
154 dwarf2_section_info loclists
{};
155 dwarf2_section_info macinfo
{};
156 dwarf2_section_info macro
{};
157 dwarf2_section_info str
{};
158 dwarf2_section_info str_offsets
{};
159 dwarf2_section_info line_str
{};
160 dwarf2_section_info ranges
{};
161 dwarf2_section_info rnglists
{};
162 dwarf2_section_info addr
{};
163 dwarf2_section_info frame
{};
164 dwarf2_section_info eh_frame
{};
165 dwarf2_section_info gdb_index
{};
166 dwarf2_section_info debug_names
{};
167 dwarf2_section_info debug_aranges
{};
169 std::vector
<dwarf2_section_info
> types
;
171 /* Table of all the compilation units. This is used to locate
172 the target compilation unit of a particular reference. */
173 std::vector
<dwarf2_per_cu_data
*> all_comp_units
;
175 /* The .debug_types-related CUs (TUs). */
176 std::vector
<signatured_type
*> all_type_units
;
178 /* Table of struct type_unit_group objects.
179 The hash key is the DW_AT_stmt_list value. */
180 htab_up type_unit_groups
;
182 /* A table mapping .debug_types signatures to its signatured_type entry.
183 This is NULL if the .debug_types section hasn't been read in yet. */
184 htab_up signatured_types
;
186 /* Type unit statistics, to see how well the scaling improvements
188 struct tu_stats tu_stats
{};
190 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
191 This is NULL if the table hasn't been allocated yet. */
194 /* True if we've checked for whether there is a DWP file. */
195 bool dwp_checked
= false;
197 /* The DWP file if there is one, or NULL. */
198 std::unique_ptr
<struct dwp_file
> dwp_file
;
200 /* The shared '.dwz' file, if one exists. This is used when the
201 original data was compressed using 'dwz -m'. */
202 std::unique_ptr
<struct dwz_file
> dwz_file
;
204 /* Whether copy relocations are supported by this object format. */
207 /* A flag indicating whether this objfile has a section loaded at a
209 bool has_section_at_zero
= false;
211 /* True if we are using the mapped index,
212 or we are faking it for OBJF_READNOW's sake. */
213 bool using_index
= false;
215 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
216 std::unique_ptr
<mapped_index
> index_table
;
218 /* The mapped index, or NULL if .debug_names is missing or not being used. */
219 std::unique_ptr
<mapped_debug_names
> debug_names_table
;
221 /* When using index_table, this keeps track of all quick_file_names entries.
222 TUs typically share line table entries with a CU, so we maintain a
223 separate table of all line table entries to support the sharing.
224 Note that while there can be way more TUs than CUs, we've already
225 sorted all the TUs into "type unit groups", grouped by their
226 DW_AT_stmt_list value. Therefore the only sharing done here is with a
227 CU and its associated TU group if there is one. */
228 htab_up quick_file_names_table
;
230 /* Set during partial symbol reading, to prevent queueing of full
232 bool reading_partial_symbols
= false;
234 /* The CUs we recently read. */
235 std::vector
<dwarf2_per_cu_data
*> just_read_cus
;
237 /* Table containing all filenames. This is an optional because the
238 table is lazily constructed on first access. */
239 gdb::optional
<filename_seen_cache
> filenames_cache
;
241 /* If we loaded the index from an external file, this contains the
242 resources associated to the open file, memory mapping, etc. */
243 std::unique_ptr
<index_cache_resource
> index_cache_res
;
245 /* Mapping from abstract origin DIE to concrete DIEs that reference it as
246 DW_AT_abstract_origin. */
247 std::unordered_map
<sect_offset
, std::vector
<sect_offset
>,
248 gdb::hash_enum
<sect_offset
>>
249 abstract_to_concrete
;
251 /* CUs that are queued to be read. */
252 std::queue
<dwarf2_queue_item
> queue
;
254 /* We keep a separate reference to the partial symtabs, in case we
255 are sharing them between objfiles. This is only set after
256 partial symbols have been read the first time. */
257 std::shared_ptr
<psymtab_storage
> partial_symtabs
;
261 /* The total number of per_cu and signatured_type objects that have
262 been created so far for this reader. */
263 size_t m_num_psymtabs
= 0;
266 /* This is the per-objfile data associated with a type_unit_group. */
268 struct type_unit_group_unshareable
270 /* The compunit symtab.
271 Type units in a group needn't all be defined in the same source file,
272 so we create an essentially anonymous symtab as the compunit symtab. */
273 struct compunit_symtab
*compunit_symtab
= nullptr;
275 /* The number of symtabs from the line header.
276 The value here must match line_header.num_file_names. */
277 unsigned int num_symtabs
= 0;
279 /* The symbol tables for this TU (obtained from the files listed in
281 WARNING: The order of entries here must match the order of entries
282 in the line header. After the first TU using this type_unit_group, the
283 line header for the subsequent TUs is recreated from this. This is done
284 because we need to use the same symtabs for each TU using the same
285 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
286 there's no guarantee the line header doesn't have duplicate entries. */
287 struct symtab
**symtabs
= nullptr;
290 /* Collection of data recorded per objfile.
291 This hangs off of dwarf2_objfile_data_key.
293 Some DWARF data cannot (currently) be shared across objfiles. Such
294 data is stored in this object. */
296 struct dwarf2_per_objfile
298 dwarf2_per_objfile (struct objfile
*objfile
, dwarf2_per_bfd
*per_bfd
)
299 : objfile (objfile
), per_bfd (per_bfd
)
302 ~dwarf2_per_objfile ();
304 /* Return pointer to string at .debug_line_str offset as read from BUF.
305 BUF is assumed to be in a compilation unit described by CU_HEADER.
306 Return *BYTES_READ_PTR count of bytes read from BUF. */
307 const char *read_line_string (const gdb_byte
*buf
,
308 const struct comp_unit_head
*cu_header
,
309 unsigned int *bytes_read_ptr
);
311 /* Resize the M_SYMTABS vector to the needed size (the number of partial
312 symtabs allocated by the per-bfd). */
313 void resize_symtabs ()
315 /* The symtabs vector should only grow, not shrink. */
316 gdb_assert (per_bfd
->num_psymtabs () >= m_symtabs
.size ());
318 m_symtabs
.resize (per_bfd
->num_psymtabs ());
321 /* Return true if the symtab corresponding to PER_CU has been set,
323 bool symtab_set_p (const dwarf2_per_cu_data
*per_cu
) const;
325 /* Return the compunit_symtab associated to PER_CU, if it has been created. */
326 compunit_symtab
*get_symtab (const dwarf2_per_cu_data
*per_cu
) const;
328 /* Set the compunit_symtab associated to PER_CU. */
329 void set_symtab (const dwarf2_per_cu_data
*per_cu
, compunit_symtab
*symtab
);
331 /* Get the type_unit_group_unshareable corresponding to TU_GROUP. If one
332 does not exist, create it. */
333 type_unit_group_unshareable
*get_type_unit_group_unshareable
334 (type_unit_group
*tu_group
);
336 struct type
*get_type_for_signatured_type (signatured_type
*sig_type
) const;
338 void set_type_for_signatured_type (signatured_type
*sig_type
,
341 /* Find an integer type SIZE_IN_BYTES bytes in size and return it.
342 UNSIGNED_P controls if the integer is unsigned or not. */
343 struct type
*int_type (int size_in_bytes
, bool unsigned_p
) const;
345 /* Get the dwarf2_cu matching PER_CU for this objfile. */
346 dwarf2_cu
*get_cu (dwarf2_per_cu_data
*per_cu
);
348 /* Set the dwarf2_cu matching PER_CU for this objfile. */
349 void set_cu (dwarf2_per_cu_data
*per_cu
, dwarf2_cu
*cu
);
351 /* Remove/free the dwarf2_cu matching PER_CU for this objfile. */
352 void remove_cu (dwarf2_per_cu_data
*per_cu
);
354 /* Free all cached compilation units. */
355 void remove_all_cus ();
357 /* Increase the age counter on each CU compilation unit and free
358 any that are too old. */
359 void age_comp_units ();
362 struct objfile
*objfile
;
364 /* Pointer to the data that is (possibly) shared between this objfile and
365 other objfiles backed by the same BFD. */
366 struct dwarf2_per_bfd
*per_bfd
;
368 /* Table mapping type DIEs to their struct type *.
369 This is nullptr if not allocated yet.
370 The mapping is done via (CU/TU + DIE offset) -> type. */
371 htab_up die_type_hash
;
373 /* Table containing line_header indexed by offset and offset_in_dwz. */
374 htab_up line_header_hash
;
377 /* Hold the corresponding compunit_symtab for each CU or TU. This
378 is indexed by dwarf2_per_cu_data::index. A NULL value means
379 that the CU/TU has not been expanded yet. */
380 std::vector
<compunit_symtab
*> m_symtabs
;
382 /* Map from a type unit group to the corresponding unshared
384 typedef std::unique_ptr
<type_unit_group_unshareable
>
385 type_unit_group_unshareable_up
;
387 std::unordered_map
<type_unit_group
*, type_unit_group_unshareable_up
>
390 /* Map from signatured types to the corresponding struct type. */
391 std::unordered_map
<signatured_type
*, struct type
*> m_type_map
;
393 /* Map from the objfile-independent dwarf2_per_cu_data instances to the
394 corresponding objfile-dependent dwarf2_cu instances. */
395 std::unordered_map
<dwarf2_per_cu_data
*, dwarf2_cu
*> m_dwarf2_cus
;
398 /* Get the dwarf2_per_objfile associated to OBJFILE. */
400 dwarf2_per_objfile
*get_dwarf2_per_objfile (struct objfile
*objfile
);
402 /* A partial symtab specialized for DWARF. */
403 struct dwarf2_psymtab
: public partial_symtab
405 dwarf2_psymtab (const char *filename
, struct objfile
*objfile
,
406 dwarf2_per_cu_data
*per_cu
)
407 : partial_symtab (filename
, objfile
, 0),
412 void read_symtab (struct objfile
*) override
;
413 void expand_psymtab (struct objfile
*) override
;
414 bool readin_p (struct objfile
*) const override
;
415 compunit_symtab
*get_compunit_symtab (struct objfile
*) const override
;
417 struct dwarf2_per_cu_data
*per_cu_data
;
420 /* Persistent data held for a compilation unit, even when not
421 processing it. We put a pointer to this structure in the
424 struct dwarf2_per_cu_data
426 /* The start offset and length of this compilation unit.
427 NOTE: Unlike comp_unit_head.length, this length includes
429 If the DIE refers to a DWO file, this is always of the original die,
431 sect_offset sect_off
;
434 /* DWARF standard version this data has been read from (such as 4 or 5). */
437 /* Flag indicating this compilation unit will be read in before
438 any of the current compilation units are processed. */
439 unsigned int queued
: 1;
441 /* This flag will be set when reading partial DIEs if we need to load
442 absolutely all DIEs for this compilation unit, instead of just the ones
443 we think are interesting. It gets set if we look for a DIE in the
444 hash table and don't find it. */
445 unsigned int load_all_dies
: 1;
447 /* Non-zero if this CU is from .debug_types.
448 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
450 unsigned int is_debug_types
: 1;
452 /* Non-zero if this CU is from the .dwz file. */
453 unsigned int is_dwz
: 1;
455 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
456 This flag is only valid if is_debug_types is true.
457 We can't read a CU directly from a DWO file: There are required
458 attributes in the stub. */
459 unsigned int reading_dwo_directly
: 1;
461 /* Non-zero if the TU has been read.
462 This is used to assist the "Stay in DWO Optimization" for Fission:
463 When reading a DWO, it's faster to read TUs from the DWO instead of
464 fetching them from random other DWOs (due to comdat folding).
465 If the TU has already been read, the optimization is unnecessary
466 (and unwise - we don't want to change where gdb thinks the TU lives
468 This flag is only valid if is_debug_types is true. */
469 unsigned int tu_read
: 1;
471 /* Our index in the unshared "symtabs" vector. */
474 /* The section this CU/TU lives in.
475 If the DIE refers to a DWO file, this is always the original die,
477 struct dwarf2_section_info
*section
;
479 /* The unit type of this CU. */
480 enum dwarf_unit_type unit_type
;
482 /* The language of this CU. */
485 /* Backlink to the owner of this. */
486 dwarf2_per_bfd
*per_bfd
;
488 /* DWARF header of this CU. Note that dwarf2_cu reads its own version of the
489 header, which may differ from this one, since it may pass rcuh_kind::TYPE
490 to read_comp_unit_head, whereas for dwarf2_per_cu_data we always pass
493 Don't access this field directly, use the get_header method instead. It
494 should be private, but we can't make it private at the moment. */
495 mutable comp_unit_head m_header
;
497 /* True if HEADER has been read in.
499 Don't access this field directly. It should be private, but we can't make
500 it private at the moment. */
501 mutable bool m_header_read_in
;
503 /* When dwarf2_per_bfd::using_index is true, the 'quick' field
504 is active. Otherwise, the 'psymtab' field is active. */
507 /* The partial symbol table associated with this compilation unit,
508 or NULL for unread partial units. */
509 dwarf2_psymtab
*psymtab
;
511 /* Data needed by the "quick" functions. */
512 struct dwarf2_per_cu_quick_data
*quick
;
515 /* The CUs we import using DW_TAG_imported_unit. This is filled in
516 while reading psymtabs, used to compute the psymtab dependencies,
517 and then cleared. Then it is filled in again while reading full
518 symbols, and only deleted when the objfile is destroyed.
520 This is also used to work around a difference between the way gold
521 generates .gdb_index version <=7 and the way gdb does. Arguably this
522 is a gold bug. For symbols coming from TUs, gold records in the index
523 the CU that includes the TU instead of the TU itself. This breaks
524 dw2_lookup_symbol: It assumes that if the index says symbol X lives
525 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
526 will find X. Alas TUs live in their own symtab, so after expanding CU Y
527 we need to look in TU Z to find X. Fortunately, this is akin to
528 DW_TAG_imported_unit, so we just use the same mechanism: For
529 .gdb_index version <=7 this also records the TUs that the CU referred
530 to. Concurrently with this change gdb was modified to emit version 8
531 indices so we only pay a price for gold generated indices.
532 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
534 This currently needs to be a public member due to how
535 dwarf2_per_cu_data is allocated and used. Ideally in future things
536 could be refactored to make this private. Until then please try to
537 avoid direct access to this member, and instead use the helper
539 std::vector
<dwarf2_per_cu_data
*> *imported_symtabs
;
541 /* Return true of IMPORTED_SYMTABS is empty or not yet allocated. */
542 bool imported_symtabs_empty () const
544 return (imported_symtabs
== nullptr || imported_symtabs
->empty ());
547 /* Push P to the back of IMPORTED_SYMTABS, allocated IMPORTED_SYMTABS
548 first if required. */
549 void imported_symtabs_push (dwarf2_per_cu_data
*p
)
551 if (imported_symtabs
== nullptr)
552 imported_symtabs
= new std::vector
<dwarf2_per_cu_data
*>;
553 imported_symtabs
->push_back (p
);
556 /* Return the size of IMPORTED_SYMTABS if it is allocated, otherwise
558 size_t imported_symtabs_size () const
560 if (imported_symtabs
== nullptr)
562 return imported_symtabs
->size ();
565 /* Delete IMPORTED_SYMTABS and set the pointer back to nullptr. */
566 void imported_symtabs_free ()
568 delete imported_symtabs
;
569 imported_symtabs
= nullptr;
572 /* Get the header of this per_cu, reading it if necessary. */
573 const comp_unit_head
*get_header () const;
575 /* Return the address size given in the compilation unit header for
577 int addr_size () const;
579 /* Return the offset size given in the compilation unit header for
581 int offset_size () const;
583 /* Return the DW_FORM_ref_addr size given in the compilation unit
584 header for this CU. */
585 int ref_addr_size () const;
587 /* Return DWARF version number of this CU. */
588 short version () const
590 return dwarf_version
;
593 /* A type unit group has a per_cu object that is recognized by
594 having no section. */
595 bool type_unit_group_p () const
597 return section
== nullptr;
601 /* Entry in the signatured_types hash table. */
603 struct signatured_type
605 /* The "per_cu" object of this type.
606 This struct is used iff per_cu.is_debug_types.
607 N.B.: This is the first member so that it's easy to convert pointers
609 struct dwarf2_per_cu_data per_cu
;
611 /* The type's signature. */
614 /* Offset in the TU of the type's DIE, as read from the TU header.
615 If this TU is a DWO stub and the definition lives in a DWO file
616 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
617 cu_offset type_offset_in_tu
;
619 /* Offset in the section of the type's DIE.
620 If the definition lives in a DWO file, this is the offset in the
621 .debug_types.dwo section.
622 The value is zero until the actual value is known.
623 Zero is otherwise not a valid section offset. */
624 sect_offset type_offset_in_section
;
626 /* Type units are grouped by their DW_AT_stmt_list entry so that they
627 can share them. This points to the containing symtab. */
628 struct type_unit_group
*type_unit_group
;
630 /* Containing DWO unit.
631 This field is valid iff per_cu.reading_dwo_directly. */
632 struct dwo_unit
*dwo_unit
;
635 /* Open the separate '.dwz' debug file, if needed. Return NULL if
636 there is no .gnu_debugaltlink section in the file. Error if there
637 is such a section but the file cannot be found. */
639 extern dwz_file
*dwarf2_get_dwz_file (dwarf2_per_bfd
*per_bfd
);
641 /* Return the type of the DIE at DIE_OFFSET in the CU named by
644 struct type
*dwarf2_get_die_type (cu_offset die_offset
,
645 dwarf2_per_cu_data
*per_cu
,
646 dwarf2_per_objfile
*per_objfile
);
648 /* Given an index in .debug_addr, fetch the value.
649 NOTE: This can be called during dwarf expression evaluation,
650 long after the debug information has been read, and thus per_cu->cu
651 may no longer exist. */
653 CORE_ADDR
dwarf2_read_addr_index (dwarf2_per_cu_data
*per_cu
,
654 dwarf2_per_objfile
*per_objfile
,
655 unsigned int addr_index
);
657 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
658 Returned value is intended for DW_OP_call*. Returned
659 dwarf2_locexpr_baton->data has lifetime of
660 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
662 struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_sect_off
663 (sect_offset sect_off
, dwarf2_per_cu_data
*per_cu
,
664 dwarf2_per_objfile
*per_objfile
,
665 CORE_ADDR (*get_frame_pc
) (void *baton
),
666 void *baton
, bool resolve_abstract_p
= false);
668 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
671 struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_cu_off
672 (cu_offset offset_in_cu
, dwarf2_per_cu_data
*per_cu
,
673 dwarf2_per_objfile
*per_objfile
,
674 CORE_ADDR (*get_frame_pc
) (void *baton
),
677 /* If the DIE at SECT_OFF in PER_CU has a DW_AT_const_value, return a
678 pointer to the constant bytes and set LEN to the length of the
679 data. If memory is needed, allocate it on OBSTACK. If the DIE
680 does not have a DW_AT_const_value, return NULL. */
682 extern const gdb_byte
*dwarf2_fetch_constant_bytes
683 (sect_offset sect_off
, dwarf2_per_cu_data
*per_cu
,
684 dwarf2_per_objfile
*per_objfile
, obstack
*obstack
,
687 /* Return the type of the die at SECT_OFF in PER_CU. Return NULL if no
688 valid type for this die is found. */
690 struct type
*dwarf2_fetch_die_type_sect_off
691 (sect_offset sect_off
, dwarf2_per_cu_data
*per_cu
,
692 dwarf2_per_objfile
*per_objfile
);
694 /* When non-zero, dump line number entries as they are read in. */
695 extern unsigned int dwarf_line_debug
;
697 #endif /* DWARF2READ_H */