1 /* Code dealing with blocks for GDB.
3 Copyright (C) 2003-2014 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/>. */
23 #include "dictionary.h"
25 /* Opaque declarations. */
29 struct block_namespace_info
;
34 /* All of the name-scope contours of the program
35 are represented by `struct block' objects.
36 All of these objects are pointed to by the blockvector.
38 Each block represents one name scope.
39 Each lexical context has its own block.
41 The blockvector begins with some special blocks.
42 The GLOBAL_BLOCK contains all the symbols defined in this compilation
43 whose scope is the entire program linked together.
44 The STATIC_BLOCK contains all the symbols whose scope is the
45 entire compilation excluding other separate compilations.
46 Blocks starting with the FIRST_LOCAL_BLOCK are not special.
48 Each block records a range of core addresses for the code that
49 is in the scope of the block. The STATIC_BLOCK and GLOBAL_BLOCK
50 give, for the range of code, the entire range of code produced
51 by the compilation that the symbol segment belongs to.
53 The blocks appear in the blockvector
54 in order of increasing starting-address,
55 and, within that, in order of decreasing ending-address.
57 This implies that within the body of one function
58 the blocks appear in the order of a depth-first tree walk. */
63 /* Addresses in the executable code that are in this block. */
68 /* The symbol that names this block, if the block is the body of a
69 function (real or inlined); otherwise, zero. */
71 struct symbol
*function
;
73 /* The `struct block' for the containing block, or 0 if none.
75 The superblock of a top-level local block (i.e. a function in the
76 case of C) is the STATIC_BLOCK. The superblock of the
77 STATIC_BLOCK is the GLOBAL_BLOCK. */
79 struct block
*superblock
;
81 /* This is used to store the symbols in the block. */
83 struct dictionary
*dict
;
85 /* Used for language-specific info. */
91 /* Contains information about namespace-related info relevant to
92 this block: using directives and the current namespace
95 struct block_namespace_info
*namespace;
102 /* The global block is singled out so that we can provide a back-link
103 to the primary symtab. */
111 /* This holds a pointer to the primary symtab holding this
114 struct symtab
*symtab
;
117 #define BLOCK_START(bl) (bl)->startaddr
118 #define BLOCK_END(bl) (bl)->endaddr
119 #define BLOCK_FUNCTION(bl) (bl)->function
120 #define BLOCK_SUPERBLOCK(bl) (bl)->superblock
121 #define BLOCK_DICT(bl) (bl)->dict
122 #define BLOCK_NAMESPACE(bl) (bl)->language_specific.cplus_specific.namespace
126 /* Number of blocks in the list. */
128 /* An address map mapping addresses to blocks in this blockvector.
129 This pointer is zero if the blocks' start and end addresses are
132 /* The blocks themselves. */
133 struct block
*block
[1];
136 #define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks
137 #define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n]
138 #define BLOCKVECTOR_MAP(blocklist) ((blocklist)->map)
140 extern struct symbol
*block_linkage_function (const struct block
*);
142 extern struct symbol
*block_containing_function (const struct block
*);
144 extern int block_inlined_p (const struct block
*block
);
146 extern int contained_in (const struct block
*, const struct block
*);
148 extern struct blockvector
*blockvector_for_pc (CORE_ADDR
, struct block
**);
150 extern struct blockvector
*blockvector_for_pc_sect (CORE_ADDR
,
151 struct obj_section
*,
155 extern int blockvector_contains_pc (struct blockvector
*bv
, CORE_ADDR pc
);
157 extern struct call_site
*call_site_for_pc (struct gdbarch
*gdbarch
,
160 extern struct block
*block_for_pc (CORE_ADDR
);
162 extern struct block
*block_for_pc_sect (CORE_ADDR
, struct obj_section
*);
164 extern const char *block_scope (const struct block
*block
);
166 extern void block_set_scope (struct block
*block
, const char *scope
,
167 struct obstack
*obstack
);
169 extern struct using_direct
*block_using (const struct block
*block
);
171 extern void block_set_using (struct block
*block
,
172 struct using_direct
*using,
173 struct obstack
*obstack
);
175 extern const struct block
*block_static_block (const struct block
*block
);
177 extern const struct block
*block_global_block (const struct block
*block
);
179 extern struct block
*allocate_block (struct obstack
*obstack
);
181 extern struct block
*allocate_global_block (struct obstack
*obstack
);
183 extern void set_block_symtab (struct block
*, struct symtab
*);
185 /* A block iterator. This structure should be treated as though it
186 were opaque; it is only defined here because we want to support
187 stack allocation of iterators. */
189 struct block_iterator
191 /* If we're iterating over a single block, this holds the block.
192 Otherwise, it holds the canonical symtab. */
196 struct symtab
*symtab
;
197 const struct block
*block
;
200 /* If we're iterating over a single block, this is always -1.
201 Otherwise, it holds the index of the current "included" symtab in
202 the canonical symtab (that is, d.symtab->includes[idx]), with -1
203 meaning the canonical symtab itself. */
207 /* Which block, either static or global, to iterate over. If this
208 is FIRST_LOCAL_BLOCK, then we are iterating over a single block.
209 This is used to select which field of 'd' is in use. */
211 enum block_enum which
;
213 /* The underlying dictionary iterator. */
215 struct dict_iterator dict_iter
;
218 /* Initialize ITERATOR to point at the first symbol in BLOCK, and
219 return that first symbol, or NULL if BLOCK is empty. */
221 extern struct symbol
*block_iterator_first (const struct block
*block
,
222 struct block_iterator
*iterator
);
224 /* Advance ITERATOR, and return the next symbol, or NULL if there are
225 no more symbols. Don't call this if you've previously received
226 NULL from block_iterator_first or block_iterator_next on this
229 extern struct symbol
*block_iterator_next (struct block_iterator
*iterator
);
231 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
232 SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), and return
233 that first symbol, or NULL if there are no such symbols. */
235 extern struct symbol
*block_iter_name_first (const struct block
*block
,
237 struct block_iterator
*iterator
);
239 /* Advance ITERATOR to point at the next symbol in BLOCK whose
240 SYMBOL_SEARCH_NAME is NAME (as tested using strcmp_iw), or NULL if
241 there are no more such symbols. Don't call this if you've
242 previously received NULL from block_iterator_first or
243 block_iterator_next on this iteration. And don't call it unless
244 ITERATOR was created by a previous call to block_iter_name_first
245 with the same NAME. */
247 extern struct symbol
*block_iter_name_next (const char *name
,
248 struct block_iterator
*iterator
);
250 /* Initialize ITERATOR to point at the first symbol in BLOCK whose
251 SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (which must use
252 the same conventions as strcmp_iw and be compatible with any
253 block hashing function), and return that first symbol, or NULL
254 if there are no such symbols. */
256 extern struct symbol
*block_iter_match_first (const struct block
*block
,
258 symbol_compare_ftype
*compare
,
259 struct block_iterator
*iterator
);
261 /* Advance ITERATOR to point at the next symbol in BLOCK whose
262 SYMBOL_SEARCH_NAME is NAME, as tested using COMPARE (see
263 block_iter_match_first), or NULL if there are no more such symbols.
264 Don't call this if you've previously received NULL from
265 block_iterator_match_first or block_iterator_match_next on this
266 iteration. And don't call it unless ITERATOR was created by a
267 previous call to block_iter_match_first with the same NAME and COMPARE. */
269 extern struct symbol
*block_iter_match_next (const char *name
,
270 symbol_compare_ftype
*compare
,
271 struct block_iterator
*iterator
);
273 /* Macro to loop through all symbols in a block BL, in no particular
274 order. ITER helps keep track of the iteration, and should be a
275 struct block_iterator. SYM points to the current symbol. */
277 #define ALL_BLOCK_SYMBOLS(block, iter, sym) \
278 for ((sym) = block_iterator_first ((block), &(iter)); \
280 (sym) = block_iterator_next (&(iter)))
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