1 /* Private partial symbol table definitions.
3 Copyright (C) 2009-2012 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/>. */
25 struct psymbol_allocation_list;
27 /* A partial_symbol records the name, domain, and address class of
28 symbols whose types we have not parsed yet. For functions, it also
29 contains their memory address, so we can find them from a PC value.
30 Each partial_symbol sits in a partial_symtab, all of which are chained
31 on a partial symtab list and which points to the corresponding
32 normal symtab once the partial_symtab has been referenced. */
34 /* This structure is space critical. See space comments at the top of
40 /* The general symbol info required for all types of symbols. */
42 struct general_symbol_info ginfo;
44 /* Name space code. */
46 ENUM_BITFIELD(domain_enum_tag) domain : 6;
48 /* Address class (for info_symbols). */
50 ENUM_BITFIELD(address_class) aclass : 6;
54 #define PSYMBOL_DOMAIN(psymbol) (psymbol)->domain
55 #define PSYMBOL_CLASS(psymbol) (psymbol)->aclass
57 /* A convenience enum to give names to some constants used when
58 searching psymtabs. This is internal to psymtab and should not be
61 enum psymtab_search_status
64 PST_SEARCHED_AND_FOUND,
65 PST_SEARCHED_AND_NOT_FOUND
68 /* Each source file that has not been fully read in is represented by
69 a partial_symtab. This contains the information on where in the
70 executable the debugging symbols for a specific file are, and a
71 list of names of global symbols which are located in this file.
72 They are all chained on partial symtab lists.
74 Even after the source file has been read into a symtab, the
75 partial_symtab remains around. They are allocated on an obstack,
81 /* Chain of all existing partial symtabs. */
83 struct partial_symtab *next;
85 /* Name of the source file which this partial_symtab defines,
86 or if the psymtab is anonymous then a descriptive name for
87 debugging purposes, or "". It must not be NULL. */
91 /* Full path of the source file. NULL if not known. */
95 /* Directory in which it was compiled, or NULL if we don't know. */
99 /* Information about the object file from which symbols should be read. */
101 struct objfile *objfile;
103 /* Set of relocation offsets to apply to each section. */
105 struct section_offsets *section_offsets;
107 /* Range of text addresses covered by this file; texthigh is the
108 beginning of the next section. Do not use if PSYMTABS_ADDRMAP_SUPPORTED
114 /* Array of pointers to all of the partial_symtab's which this one
115 depends on. Since this array can only be set to previous or
116 the current (?) psymtab, this dependency tree is guaranteed not
117 to have any loops. "depends on" means that symbols must be read
118 for the dependencies before being read for this psymtab; this is
119 for type references in stabs, where if foo.c includes foo.h, declarations
120 in foo.h may use type numbers defined in foo.c. For other debugging
121 formats there may be no need to use dependencies. */
123 struct partial_symtab **dependencies;
125 int number_of_dependencies;
127 /* If NULL, this is an ordinary partial symbol table.
129 If non-NULL, this holds a single includer of this partial symbol
130 table, and this partial symbol table is a shared one.
132 A shared psymtab is one that is referenced by multiple other
133 psymtabs, and which conceptually has its contents directly
136 Shared psymtabs have special semantics. When a search finds a
137 symbol in a shared table, we instead return one of the non-shared
138 tables that include this one.
140 A shared psymtabs can be referred to by other shared ones.
142 The psymtabs that refer to a shared psymtab will list the shared
143 psymtab in their 'dependencies' array.
145 In DWARF terms, a shared psymtab is a DW_TAG_partial_unit; but
146 of course using a name based on that would be too confusing, so
147 "shared" was chosen instead.
149 Only a single user is needed because, when expanding a shared
150 psymtab, we only need to expand its "canonical" non-shared user.
151 The choice of which one should be canonical is left to the
152 debuginfo reader; it can be arbitrary. */
154 struct partial_symtab *user;
156 /* Global symbol list. This list will be sorted after readin to
157 improve access. Binary search will be the usual method of
158 finding a symbol within it. globals_offset is an integer offset
159 within global_psymbols[]. */
164 /* Static symbol list. This list will *not* be sorted after readin;
165 to find a symbol in it, exhaustive search must be used. This is
166 reasonable because searches through this list will eventually
167 lead to either the read in of a files symbols for real (assumed
168 to take a *lot* of time; check) or an error (and we don't care
169 how long errors take). This is an offset and size within
170 static_psymbols[]. */
175 /* Non-zero if the symtab corresponding to this psymtab has been
176 readin. This is located here so that this structure packs better
177 on 64-bit systems. */
179 unsigned char readin;
181 /* True iff objfile->psymtabs_addrmap is properly populated for this
182 partial_symtab. For discontiguous overlapping psymtabs is the only usable
183 info in PSYMTABS_ADDRMAP. */
185 unsigned char psymtabs_addrmap_supported;
187 /* True if the name of this partial symtab is not a source file name. */
189 unsigned char anonymous;
191 /* A flag that is temporarily used when searching psymtabs. */
193 ENUM_BITFIELD (psymtab_search_status) searched_flag : 2;
195 /* Pointer to symtab eventually allocated for this source file, 0 if
196 !readin or if we haven't looked for the symtab after it was readin. */
198 struct symtab *symtab;
200 /* Pointer to function which will read in the symtab corresponding to
203 void (*read_symtab) (struct partial_symtab *);
205 /* Information that lets read_symtab() locate the part of the symbol table
206 that this psymtab corresponds to. This information is private to the
207 format-dependent symbol reading routines. For further detail examine
208 the various symbol reading modules. */
210 void *read_symtab_private;
213 extern void sort_pst_symbols (struct partial_symtab *);
215 /* Add any kind of symbol to a psymbol_allocation_list. */
217 extern void add_psymbol_to_list (const char *, int,
220 struct psymbol_allocation_list *,
222 enum language, struct objfile *);
224 extern void init_psymbol_list (struct objfile *, int);
226 extern struct partial_symtab *start_psymtab_common (struct objfile *,
227 struct section_offsets *,
228 const char *, CORE_ADDR,
229 struct partial_symbol **,
230 struct partial_symbol **);
232 extern struct partial_symtab *allocate_psymtab (const char *,
235 extern void discard_psymtab (struct partial_symtab *);
237 /* Traverse all psymtabs in one objfile. */
239 #define ALL_OBJFILE_PSYMTABS(objfile, p) \
240 for ((p) = (objfile) -> psymtabs; (p) != NULL; (p) = (p) -> next)
242 #endif /* PSYMPRIV_H */