1 /* Block-related functions for the GNU debugger, GDB.
3 Copyright (C) 2003, 2007, 2008, 2009 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 "gdb_obstack.h"
25 #include "cp-support.h"
28 /* This is used by struct block to store namespace-related info for
29 C++ files, namely using declarations and the current namespace in
32 struct block_namespace_info
35 struct using_direct
*using;
38 static void block_initialize_namespace (struct block
*block
,
39 struct obstack
*obstack
);
41 /* Return Nonzero if block a is lexically nested within block b,
42 or if a and b have the same pc range.
43 Return zero otherwise. */
46 contained_in (const struct block
*a
, const struct block
*b
)
55 a
= BLOCK_SUPERBLOCK (a
);
63 /* Return the symbol for the function which contains a specified
64 lexical block, described by a struct block BL. The return value
65 will not be an inlined function; the containing function will be
69 block_linkage_function (const struct block
*bl
)
71 while ((BLOCK_FUNCTION (bl
) == NULL
|| block_inlined_p (bl
))
72 && BLOCK_SUPERBLOCK (bl
) != NULL
)
73 bl
= BLOCK_SUPERBLOCK (bl
);
75 return BLOCK_FUNCTION (bl
);
78 /* Return one if BL represents an inlined function. */
81 block_inlined_p (const struct block
*bl
)
83 return BLOCK_FUNCTION (bl
) != NULL
&& SYMBOL_INLINED (BLOCK_FUNCTION (bl
));
86 /* Return the blockvector immediately containing the innermost lexical
87 block containing the specified pc value and section, or 0 if there
88 is none. PBLOCK is a pointer to the block. If PBLOCK is NULL, we
89 don't pass this information back to the caller. */
92 blockvector_for_pc_sect (CORE_ADDR pc
, struct obj_section
*section
,
93 struct block
**pblock
, struct symtab
*symtab
)
97 struct blockvector
*bl
;
99 if (symtab
== 0) /* if no symtab specified by caller */
101 /* First search all symtabs for one whose file contains our pc */
102 symtab
= find_pc_sect_symtab (pc
, section
);
107 bl
= BLOCKVECTOR (symtab
);
109 /* Then search that symtab for the smallest block that wins. */
111 /* If we have an addrmap mapping code addresses to blocks, then use
113 if (BLOCKVECTOR_MAP (bl
))
115 b
= addrmap_find (BLOCKVECTOR_MAP (bl
), pc
);
127 /* Otherwise, use binary search to find the last block that starts
130 top
= BLOCKVECTOR_NBLOCKS (bl
);
132 while (top
- bot
> 1)
134 half
= (top
- bot
+ 1) >> 1;
135 b
= BLOCKVECTOR_BLOCK (bl
, bot
+ half
);
136 if (BLOCK_START (b
) <= pc
)
142 /* Now search backward for a block that ends after PC. */
146 b
= BLOCKVECTOR_BLOCK (bl
, bot
);
147 if (BLOCK_END (b
) > pc
)
158 /* Return the blockvector immediately containing the innermost lexical block
159 containing the specified pc value, or 0 if there is none.
160 Backward compatibility, no section. */
163 blockvector_for_pc (CORE_ADDR pc
, struct block
**pblock
)
165 return blockvector_for_pc_sect (pc
, find_pc_mapped_section (pc
),
169 /* Return the innermost lexical block containing the specified pc value
170 in the specified section, or 0 if there is none. */
173 block_for_pc_sect (CORE_ADDR pc
, struct obj_section
*section
)
175 struct blockvector
*bl
;
178 bl
= blockvector_for_pc_sect (pc
, section
, &b
, NULL
);
184 /* Return the innermost lexical block containing the specified pc value,
185 or 0 if there is none. Backward compatibility, no section. */
188 block_for_pc (CORE_ADDR pc
)
190 return block_for_pc_sect (pc
, find_pc_mapped_section (pc
));
193 /* Now come some functions designed to deal with C++ namespace issues.
194 The accessors are safe to use even in the non-C++ case. */
196 /* This returns the namespace that BLOCK is enclosed in, or "" if it
197 isn't enclosed in a namespace at all. This travels the chain of
198 superblocks looking for a scope, if necessary. */
201 block_scope (const struct block
*block
)
203 for (; block
!= NULL
; block
= BLOCK_SUPERBLOCK (block
))
205 if (BLOCK_NAMESPACE (block
) != NULL
206 && BLOCK_NAMESPACE (block
)->scope
!= NULL
)
207 return BLOCK_NAMESPACE (block
)->scope
;
213 /* Set BLOCK's scope member to SCOPE; if needed, allocate memory via
214 OBSTACK. (It won't make a copy of SCOPE, however, so that already
215 has to be allocated correctly.) */
218 block_set_scope (struct block
*block
, const char *scope
,
219 struct obstack
*obstack
)
221 block_initialize_namespace (block
, obstack
);
223 BLOCK_NAMESPACE (block
)->scope
= scope
;
226 /* This returns the using directives list associated with BLOCK, if
229 struct using_direct
*
230 block_using (const struct block
*block
)
232 if (block
== NULL
|| BLOCK_NAMESPACE (block
) == NULL
)
235 return BLOCK_NAMESPACE (block
)->using;
238 /* Set BLOCK's using member to USING; if needed, allocate memory via
239 OBSTACK. (It won't make a copy of USING, however, so that already
240 has to be allocated correctly.) */
243 block_set_using (struct block
*block
,
244 struct using_direct
*using,
245 struct obstack
*obstack
)
247 block_initialize_namespace (block
, obstack
);
249 BLOCK_NAMESPACE (block
)->using = using;
252 /* If BLOCK_NAMESPACE (block) is NULL, allocate it via OBSTACK and
253 ititialize its members to zero. */
256 block_initialize_namespace (struct block
*block
, struct obstack
*obstack
)
258 if (BLOCK_NAMESPACE (block
) == NULL
)
260 BLOCK_NAMESPACE (block
)
261 = obstack_alloc (obstack
, sizeof (struct block_namespace_info
));
262 BLOCK_NAMESPACE (block
)->scope
= NULL
;
263 BLOCK_NAMESPACE (block
)->using = NULL
;
267 /* Return the static block associated to BLOCK. Return NULL if block
268 is NULL or if block is a global block. */
271 block_static_block (const struct block
*block
)
273 if (block
== NULL
|| BLOCK_SUPERBLOCK (block
) == NULL
)
276 while (BLOCK_SUPERBLOCK (BLOCK_SUPERBLOCK (block
)) != NULL
)
277 block
= BLOCK_SUPERBLOCK (block
);
282 /* Return the static block associated to BLOCK. Return NULL if block
286 block_global_block (const struct block
*block
)
291 while (BLOCK_SUPERBLOCK (block
) != NULL
)
292 block
= BLOCK_SUPERBLOCK (block
);
297 /* Allocate a block on OBSTACK, and initialize its elements to
298 zero/NULL. This is useful for creating "dummy" blocks that don't
299 correspond to actual source files.
301 Warning: it sets the block's BLOCK_DICT to NULL, which isn't a
302 valid value. If you really don't want the block to have a
303 dictionary, then you should subsequently set its BLOCK_DICT to
304 dict_create_linear (obstack, NULL). */
307 allocate_block (struct obstack
*obstack
)
309 struct block
*bl
= obstack_alloc (obstack
, sizeof (struct block
));
311 BLOCK_START (bl
) = 0;
313 BLOCK_FUNCTION (bl
) = NULL
;
314 BLOCK_SUPERBLOCK (bl
) = NULL
;
315 BLOCK_DICT (bl
) = NULL
;
316 BLOCK_NAMESPACE (bl
) = NULL
;
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