1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2021 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"
31 #include "gdbsupport/function-view.h"
34 /* Hold 'maintenance (set|show) dwarf' commands. */
35 extern struct cmd_list_element
*set_dwarf_cmdlist
;
36 extern struct cmd_list_element
*show_dwarf_cmdlist
;
40 int nr_uniq_abbrev_tables
;
42 int nr_symtab_sharers
;
43 int nr_stmt_less_type_units
;
44 int nr_all_type_units_reallocs
;
49 struct dwarf2_debug_sections
;
50 struct dwarf2_per_cu_data
;
52 struct mapped_debug_names
;
53 struct signatured_type
;
54 struct type_unit_group
;
56 /* One item on the queue of compilation units to read in full symbols
58 struct dwarf2_queue_item
60 dwarf2_queue_item (dwarf2_per_cu_data
*cu
, dwarf2_per_objfile
*per_objfile
,
63 per_objfile (per_objfile
),
64 pretend_language (lang
)
68 ~dwarf2_queue_item ();
70 DISABLE_COPY_AND_ASSIGN (dwarf2_queue_item
);
72 dwarf2_per_cu_data
*per_cu
;
73 dwarf2_per_objfile
*per_objfile
;
74 enum language pretend_language
;
77 /* A deleter for dwarf2_per_cu_data that knows to downcast to
78 signatured_type as appropriate. This approach lets us avoid a
79 virtual destructor, which saves a bit of space. */
81 struct dwarf2_per_cu_data_deleter
83 void operator() (dwarf2_per_cu_data
*data
);
86 /* A specialization of unique_ptr for dwarf2_per_cu_data and
88 typedef std::unique_ptr
<dwarf2_per_cu_data
, dwarf2_per_cu_data_deleter
>
89 dwarf2_per_cu_data_up
;
91 /* Some DWARF data can be shared across objfiles who share the same BFD,
92 this data is stored in this object.
94 Two dwarf2_per_objfile objects representing objfiles sharing the same BFD
95 will point to the same instance of dwarf2_per_bfd, unless the BFD requires
100 /* Construct a dwarf2_per_bfd for OBFD. NAMES points to the
101 dwarf2 section names, or is NULL if the standard ELF names are
102 used. CAN_COPY is true for formats where symbol
103 interposition is possible and so symbol values must follow copy
105 dwarf2_per_bfd (bfd
*obfd
, const dwarf2_debug_sections
*names
, bool can_copy
);
109 DISABLE_COPY_AND_ASSIGN (dwarf2_per_bfd
);
111 /* Return the CU given its index. */
112 dwarf2_per_cu_data
*get_cu (int index
) const
114 return this->all_comp_units
[index
].get ();
117 /* A convenience function to allocate a dwarf2_per_cu_data. The
118 returned object has its "index" field set properly. The object
119 is allocated on the dwarf2_per_bfd obstack. */
120 dwarf2_per_cu_data_up
allocate_per_cu ();
122 /* A convenience function to allocate a signatured_type. The
123 returned object has its "index" field set properly. The object
124 is allocated on the dwarf2_per_bfd obstack. */
125 std::unique_ptr
<signatured_type
> allocate_signatured_type ();
127 /* Return the number of partial symtabs allocated with allocate_per_cu
128 and allocate_signatured_type so far. */
129 int num_psymtabs () const
130 { return m_num_psymtabs
; }
133 /* This function is mapped across the sections and remembers the
134 offset and size of each of the debugging sections we are
136 void locate_sections (bfd
*abfd
, asection
*sectp
,
137 const dwarf2_debug_sections
&names
);
140 /* The corresponding BFD. */
143 /* Objects that can be shared across objfiles are stored in this
144 obstack or on the psymtab obstack, while objects that are
145 objfile-specific are stored on the objfile obstack. */
146 auto_obstack obstack
;
148 dwarf2_section_info info
{};
149 dwarf2_section_info abbrev
{};
150 dwarf2_section_info line
{};
151 dwarf2_section_info loc
{};
152 dwarf2_section_info loclists
{};
153 dwarf2_section_info macinfo
{};
154 dwarf2_section_info macro
{};
155 dwarf2_section_info str
{};
156 dwarf2_section_info str_offsets
{};
157 dwarf2_section_info line_str
{};
158 dwarf2_section_info ranges
{};
159 dwarf2_section_info rnglists
{};
160 dwarf2_section_info addr
{};
161 dwarf2_section_info frame
{};
162 dwarf2_section_info eh_frame
{};
163 dwarf2_section_info gdb_index
{};
164 dwarf2_section_info debug_names
{};
165 dwarf2_section_info debug_aranges
{};
167 std::vector
<dwarf2_section_info
> types
;
169 /* Table of all the compilation units. This is used to locate
170 the target compilation unit of a particular reference. */
171 std::vector
<dwarf2_per_cu_data_up
> all_comp_units
;
173 /* Table of struct type_unit_group objects.
174 The hash key is the DW_AT_stmt_list value. */
175 htab_up type_unit_groups
;
177 /* A table mapping .debug_types signatures to its signatured_type entry.
178 This is NULL if the .debug_types section hasn't been read in yet. */
179 htab_up signatured_types
;
181 /* Type unit statistics, to see how well the scaling improvements
183 struct tu_stats tu_stats
{};
185 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
186 This is NULL if the table hasn't been allocated yet. */
189 /* True if we've checked for whether there is a DWP file. */
190 bool dwp_checked
= false;
192 /* The DWP file if there is one, or NULL. */
193 std::unique_ptr
<struct dwp_file
> dwp_file
;
195 /* The shared '.dwz' file, if one exists. This is used when the
196 original data was compressed using 'dwz -m'. */
197 std::unique_ptr
<struct dwz_file
> dwz_file
;
199 /* Whether copy relocations are supported by this object format. */
202 /* A flag indicating whether this objfile has a section loaded at a
204 bool has_section_at_zero
= false;
206 /* True if we are using the mapped index,
207 or we are faking it for OBJF_READNOW's sake. */
208 bool using_index
= false;
210 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
211 std::unique_ptr
<mapped_index
> index_table
;
213 /* The mapped index, or NULL if .debug_names is missing or not being used. */
214 std::unique_ptr
<mapped_debug_names
> debug_names_table
;
216 /* When using index_table, this keeps track of all quick_file_names entries.
217 TUs typically share line table entries with a CU, so we maintain a
218 separate table of all line table entries to support the sharing.
219 Note that while there can be way more TUs than CUs, we've already
220 sorted all the TUs into "type unit groups", grouped by their
221 DW_AT_stmt_list value. Therefore the only sharing done here is with a
222 CU and its associated TU group if there is one. */
223 htab_up quick_file_names_table
;
225 /* Set during partial symbol reading, to prevent queueing of full
227 bool reading_partial_symbols
= false;
229 /* The CUs we recently read. */
230 std::vector
<dwarf2_per_cu_data
*> just_read_cus
;
232 /* If we loaded the index from an external file, this contains the
233 resources associated to the open file, memory mapping, etc. */
234 std::unique_ptr
<index_cache_resource
> index_cache_res
;
236 /* Mapping from abstract origin DIE to concrete DIEs that reference it as
237 DW_AT_abstract_origin. */
238 std::unordered_map
<sect_offset
, std::vector
<sect_offset
>,
239 gdb::hash_enum
<sect_offset
>>
240 abstract_to_concrete
;
242 /* CUs that are queued to be read. */
243 gdb::optional
<std::queue
<dwarf2_queue_item
>> queue
;
245 /* We keep a separate reference to the partial symtabs, in case we
246 are sharing them between objfiles. This is only set after
247 partial symbols have been read the first time. */
248 std::shared_ptr
<psymtab_storage
> partial_symtabs
;
250 /* The address map that is used by the DWARF index code. */
251 struct addrmap
*index_addrmap
= nullptr;
255 /* The total number of per_cu and signatured_type objects that have
256 been created so far for this reader. */
257 size_t m_num_psymtabs
= 0;
260 /* This is the per-objfile data associated with a type_unit_group. */
262 struct type_unit_group_unshareable
264 /* The compunit symtab.
265 Type units in a group needn't all be defined in the same source file,
266 so we create an essentially anonymous symtab as the compunit symtab. */
267 struct compunit_symtab
*compunit_symtab
= nullptr;
269 /* The number of symtabs from the line header.
270 The value here must match line_header.num_file_names. */
271 unsigned int num_symtabs
= 0;
273 /* The symbol tables for this TU (obtained from the files listed in
275 WARNING: The order of entries here must match the order of entries
276 in the line header. After the first TU using this type_unit_group, the
277 line header for the subsequent TUs is recreated from this. This is done
278 because we need to use the same symtabs for each TU using the same
279 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
280 there's no guarantee the line header doesn't have duplicate entries. */
281 struct symtab
**symtabs
= nullptr;
284 /* Collection of data recorded per objfile.
285 This hangs off of dwarf2_objfile_data_key.
287 Some DWARF data cannot (currently) be shared across objfiles. Such
288 data is stored in this object. */
290 struct dwarf2_per_objfile
292 dwarf2_per_objfile (struct objfile
*objfile
, dwarf2_per_bfd
*per_bfd
)
293 : objfile (objfile
), per_bfd (per_bfd
)
296 ~dwarf2_per_objfile ();
298 /* Return pointer to string at .debug_line_str offset as read from BUF.
299 BUF is assumed to be in a compilation unit described by CU_HEADER.
300 Return *BYTES_READ_PTR count of bytes read from BUF. */
301 const char *read_line_string (const gdb_byte
*buf
,
302 const struct comp_unit_head
*cu_header
,
303 unsigned int *bytes_read_ptr
);
305 /* Resize the M_SYMTABS vector to the needed size (the number of partial
306 symtabs allocated by the per-bfd). */
307 void resize_symtabs ()
309 /* The symtabs vector should only grow, not shrink. */
310 gdb_assert (per_bfd
->num_psymtabs () >= m_symtabs
.size ());
312 m_symtabs
.resize (per_bfd
->num_psymtabs ());
315 /* Return true if the symtab corresponding to PER_CU has been set,
317 bool symtab_set_p (const dwarf2_per_cu_data
*per_cu
) const;
319 /* Return the compunit_symtab associated to PER_CU, if it has been created. */
320 compunit_symtab
*get_symtab (const dwarf2_per_cu_data
*per_cu
) const;
322 /* Set the compunit_symtab associated to PER_CU. */
323 void set_symtab (const dwarf2_per_cu_data
*per_cu
, compunit_symtab
*symtab
);
325 /* Get the type_unit_group_unshareable corresponding to TU_GROUP. If one
326 does not exist, create it. */
327 type_unit_group_unshareable
*get_type_unit_group_unshareable
328 (type_unit_group
*tu_group
);
330 struct type
*get_type_for_signatured_type (signatured_type
*sig_type
) const;
332 void set_type_for_signatured_type (signatured_type
*sig_type
,
335 /* Find an integer type SIZE_IN_BYTES bytes in size and return it.
336 UNSIGNED_P controls if the integer is unsigned or not. */
337 struct type
*int_type (int size_in_bytes
, bool unsigned_p
) const;
339 /* Get the dwarf2_cu matching PER_CU for this objfile. */
340 dwarf2_cu
*get_cu (dwarf2_per_cu_data
*per_cu
);
342 /* Set the dwarf2_cu matching PER_CU for this objfile. */
343 void set_cu (dwarf2_per_cu_data
*per_cu
, dwarf2_cu
*cu
);
345 /* Remove/free the dwarf2_cu matching PER_CU for this objfile. */
346 void remove_cu (dwarf2_per_cu_data
*per_cu
);
348 /* Free all cached compilation units. */
349 void remove_all_cus ();
351 /* Increase the age counter on each CU compilation unit and free
352 any that are too old. */
353 void age_comp_units ();
356 struct objfile
*objfile
;
358 /* Pointer to the data that is (possibly) shared between this objfile and
359 other objfiles backed by the same BFD. */
360 struct dwarf2_per_bfd
*per_bfd
;
362 /* Table mapping type DIEs to their struct type *.
363 This is nullptr if not allocated yet.
364 The mapping is done via (CU/TU + DIE offset) -> type. */
365 htab_up die_type_hash
;
367 /* Table containing line_header indexed by offset and offset_in_dwz. */
368 htab_up line_header_hash
;
371 /* Hold the corresponding compunit_symtab for each CU or TU. This
372 is indexed by dwarf2_per_cu_data::index. A NULL value means
373 that the CU/TU has not been expanded yet. */
374 std::vector
<compunit_symtab
*> m_symtabs
;
376 /* Map from a type unit group to the corresponding unshared
378 typedef std::unique_ptr
<type_unit_group_unshareable
>
379 type_unit_group_unshareable_up
;
381 std::unordered_map
<type_unit_group
*, type_unit_group_unshareable_up
>
384 /* Map from signatured types to the corresponding struct type. */
385 std::unordered_map
<signatured_type
*, struct type
*> m_type_map
;
387 /* Map from the objfile-independent dwarf2_per_cu_data instances to the
388 corresponding objfile-dependent dwarf2_cu instances. */
389 std::unordered_map
<dwarf2_per_cu_data
*, dwarf2_cu
*> m_dwarf2_cus
;
392 /* Get the dwarf2_per_objfile associated to OBJFILE. */
394 dwarf2_per_objfile
*get_dwarf2_per_objfile (struct objfile
*objfile
);
396 /* A partial symtab specialized for DWARF. */
397 struct dwarf2_psymtab
: public partial_symtab
399 dwarf2_psymtab (const char *filename
,
400 psymtab_storage
*partial_symtabs
,
401 objfile_per_bfd_storage
*objfile_per_bfd
,
402 dwarf2_per_cu_data
*per_cu
)
403 : partial_symtab (filename
, partial_symtabs
, objfile_per_bfd
, 0),
408 void read_symtab (struct objfile
*) override
;
409 void expand_psymtab (struct objfile
*) override
;
410 bool readin_p (struct objfile
*) const override
;
411 compunit_symtab
*get_compunit_symtab (struct objfile
*) const override
;
413 struct dwarf2_per_cu_data
*per_cu_data
;
416 /* Persistent data held for a compilation unit, even when not
417 processing it. We put a pointer to this structure in the
420 struct dwarf2_per_cu_data
422 dwarf2_per_cu_data ()
424 load_all_dies (false),
425 is_debug_types (false),
427 reading_dwo_directly (false),
429 m_header_read_in (false),
431 lang (language_unknown
)
435 /* The start offset and length of this compilation unit.
436 NOTE: Unlike comp_unit_head.length, this length includes
438 If the DIE refers to a DWO file, this is always of the original die,
440 sect_offset sect_off
{};
441 unsigned int length
= 0;
443 /* DWARF standard version this data has been read from (such as 4 or 5). */
444 unsigned char dwarf_version
= 0;
446 /* Flag indicating this compilation unit will be read in before
447 any of the current compilation units are processed. */
448 unsigned int queued
: 1;
450 /* This flag will be set when reading partial DIEs if we need to load
451 absolutely all DIEs for this compilation unit, instead of just the ones
452 we think are interesting. It gets set if we look for a DIE in the
453 hash table and don't find it. */
454 unsigned int load_all_dies
: 1;
456 /* Non-zero if this CU is from .debug_types.
457 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
459 unsigned int is_debug_types
: 1;
461 /* Non-zero if this CU is from the .dwz file. */
462 unsigned int is_dwz
: 1;
464 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
465 This flag is only valid if is_debug_types is true.
466 We can't read a CU directly from a DWO file: There are required
467 attributes in the stub. */
468 unsigned int reading_dwo_directly
: 1;
470 /* Non-zero if the TU has been read.
471 This is used to assist the "Stay in DWO Optimization" for Fission:
472 When reading a DWO, it's faster to read TUs from the DWO instead of
473 fetching them from random other DWOs (due to comdat folding).
474 If the TU has already been read, the optimization is unnecessary
475 (and unwise - we don't want to change where gdb thinks the TU lives
477 This flag is only valid if is_debug_types is true. */
478 unsigned int tu_read
: 1;
480 /* True if HEADER has been read in.
482 Don't access this field directly. It should be private, but we can't make
483 it private at the moment. */
484 mutable bool m_header_read_in
: 1;
486 /* The unit type of this CU. */
487 ENUM_BITFIELD (dwarf_unit_type
) unit_type
: 8;
489 /* The language of this CU. */
490 ENUM_BITFIELD (language
) lang
: LANGUAGE_BITS
;
492 /* Our index in the unshared "symtabs" vector. */
495 /* The section this CU/TU lives in.
496 If the DIE refers to a DWO file, this is always the original die,
498 struct dwarf2_section_info
*section
= nullptr;
500 /* Backlink to the owner of this. */
501 dwarf2_per_bfd
*per_bfd
= nullptr;
503 /* DWARF header of this CU. Note that dwarf2_cu reads its own version of the
504 header, which may differ from this one, since it may pass rcuh_kind::TYPE
505 to read_comp_unit_head, whereas for dwarf2_per_cu_data we always pass
508 Don't access this field directly, use the get_header method instead. It
509 should be private, but we can't make it private at the moment. */
510 mutable comp_unit_head m_header
{};
512 /* When dwarf2_per_bfd::using_index is true, the 'quick' field
513 is active. Otherwise, the 'psymtab' field is active. */
516 /* The partial symbol table associated with this compilation unit,
517 or NULL for unread partial units. */
518 dwarf2_psymtab
*psymtab
;
520 /* Data needed by the "quick" functions. */
521 struct dwarf2_per_cu_quick_data
*quick
;
524 /* The CUs we import using DW_TAG_imported_unit. This is filled in
525 while reading psymtabs, used to compute the psymtab dependencies,
526 and then cleared. Then it is filled in again while reading full
527 symbols, and only deleted when the objfile is destroyed.
529 This is also used to work around a difference between the way gold
530 generates .gdb_index version <=7 and the way gdb does. Arguably this
531 is a gold bug. For symbols coming from TUs, gold records in the index
532 the CU that includes the TU instead of the TU itself. This breaks
533 dw2_lookup_symbol: It assumes that if the index says symbol X lives
534 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
535 will find X. Alas TUs live in their own symtab, so after expanding CU Y
536 we need to look in TU Z to find X. Fortunately, this is akin to
537 DW_TAG_imported_unit, so we just use the same mechanism: For
538 .gdb_index version <=7 this also records the TUs that the CU referred
539 to. Concurrently with this change gdb was modified to emit version 8
540 indices so we only pay a price for gold generated indices.
541 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
543 This currently needs to be a public member due to how
544 dwarf2_per_cu_data is allocated and used. Ideally in future things
545 could be refactored to make this private. Until then please try to
546 avoid direct access to this member, and instead use the helper
548 std::vector
<dwarf2_per_cu_data
*> *imported_symtabs
= nullptr;
550 /* Return true of IMPORTED_SYMTABS is empty or not yet allocated. */
551 bool imported_symtabs_empty () const
553 return (imported_symtabs
== nullptr || imported_symtabs
->empty ());
556 /* Push P to the back of IMPORTED_SYMTABS, allocated IMPORTED_SYMTABS
557 first if required. */
558 void imported_symtabs_push (dwarf2_per_cu_data
*p
)
560 if (imported_symtabs
== nullptr)
561 imported_symtabs
= new std::vector
<dwarf2_per_cu_data
*>;
562 imported_symtabs
->push_back (p
);
565 /* Return the size of IMPORTED_SYMTABS if it is allocated, otherwise
567 size_t imported_symtabs_size () const
569 if (imported_symtabs
== nullptr)
571 return imported_symtabs
->size ();
574 /* Delete IMPORTED_SYMTABS and set the pointer back to nullptr. */
575 void imported_symtabs_free ()
577 delete imported_symtabs
;
578 imported_symtabs
= nullptr;
581 /* Get the header of this per_cu, reading it if necessary. */
582 const comp_unit_head
*get_header () const;
584 /* Return the address size given in the compilation unit header for
586 int addr_size () const;
588 /* Return the offset size given in the compilation unit header for
590 int offset_size () const;
592 /* Return the DW_FORM_ref_addr size given in the compilation unit
593 header for this CU. */
594 int ref_addr_size () const;
596 /* Return DWARF version number of this CU. */
597 short version () const
599 return dwarf_version
;
602 /* A type unit group has a per_cu object that is recognized by
603 having no section. */
604 bool type_unit_group_p () const
606 return section
== nullptr;
610 /* Entry in the signatured_types hash table. */
612 struct signatured_type
: public dwarf2_per_cu_data
614 /* The type's signature. */
615 ULONGEST signature
= 0;
617 /* Offset in the TU of the type's DIE, as read from the TU header.
618 If this TU is a DWO stub and the definition lives in a DWO file
619 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
620 cu_offset type_offset_in_tu
{};
622 /* Offset in the section of the type's DIE.
623 If the definition lives in a DWO file, this is the offset in the
624 .debug_types.dwo section.
625 The value is zero until the actual value is known.
626 Zero is otherwise not a valid section offset. */
627 sect_offset type_offset_in_section
{};
629 /* Type units are grouped by their DW_AT_stmt_list entry so that they
630 can share them. This points to the containing symtab. */
631 struct type_unit_group
*type_unit_group
= nullptr;
633 /* Containing DWO unit.
634 This field is valid iff per_cu.reading_dwo_directly. */
635 struct dwo_unit
*dwo_unit
= nullptr;
638 /* Return the type of the DIE at DIE_OFFSET in the CU named by
641 struct type
*dwarf2_get_die_type (cu_offset die_offset
,
642 dwarf2_per_cu_data
*per_cu
,
643 dwarf2_per_objfile
*per_objfile
);
645 /* Given an index in .debug_addr, fetch the value.
646 NOTE: This can be called during dwarf expression evaluation,
647 long after the debug information has been read, and thus per_cu->cu
648 may no longer exist. */
650 CORE_ADDR
dwarf2_read_addr_index (dwarf2_per_cu_data
*per_cu
,
651 dwarf2_per_objfile
*per_objfile
,
652 unsigned int addr_index
);
654 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
655 Returned value is intended for DW_OP_call*. Returned
656 dwarf2_locexpr_baton->data has lifetime of
657 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
659 struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_sect_off
660 (sect_offset sect_off
, dwarf2_per_cu_data
*per_cu
,
661 dwarf2_per_objfile
*per_objfile
,
662 gdb::function_view
<CORE_ADDR ()> get_frame_pc
,
663 bool resolve_abstract_p
= false);
665 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
668 struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_cu_off
669 (cu_offset offset_in_cu
, dwarf2_per_cu_data
*per_cu
,
670 dwarf2_per_objfile
*per_objfile
,
671 gdb::function_view
<CORE_ADDR ()> get_frame_pc
);
673 /* If the DIE at SECT_OFF in PER_CU has a DW_AT_const_value, return a
674 pointer to the constant bytes and set LEN to the length of the
675 data. If memory is needed, allocate it on OBSTACK. If the DIE
676 does not have a DW_AT_const_value, return NULL. */
678 extern const gdb_byte
*dwarf2_fetch_constant_bytes
679 (sect_offset sect_off
, dwarf2_per_cu_data
*per_cu
,
680 dwarf2_per_objfile
*per_objfile
, obstack
*obstack
,
683 /* Return the type of the die at SECT_OFF in PER_CU. Return NULL if no
684 valid type for this die is found. */
686 struct type
*dwarf2_fetch_die_type_sect_off
687 (sect_offset sect_off
, dwarf2_per_cu_data
*per_cu
,
688 dwarf2_per_objfile
*per_objfile
);
690 /* When non-zero, dump line number entries as they are read in. */
691 extern unsigned int dwarf_line_debug
;
693 /* Dwarf2 sections that can be accessed by dwarf2_get_section_info. */
694 enum dwarf2_section_enum
{
699 extern void dwarf2_get_section_info (struct objfile
*,
700 enum dwarf2_section_enum
,
701 asection
**, const gdb_byte
**,
704 #endif /* DWARF2READ_H */