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f3e9a817 PM |
1 | /* Python interface to blocks. |
2 | ||
3 | Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "block.h" | |
22 | #include "dictionary.h" | |
23 | #include "symtab.h" | |
24 | #include "python-internal.h" | |
25 | #include "objfiles.h" | |
26 | #include "symtab.h" | |
27 | ||
28 | typedef struct blpy_block_object { | |
29 | PyObject_HEAD | |
30 | /* The GDB block structure that represents a frame's code block. */ | |
31 | struct block *block; | |
32 | /* The backing object file. There is no direct relationship in GDB | |
33 | between a block and an object file. When a block is created also | |
34 | store a pointer to the object file for later use. */ | |
35 | struct objfile *objfile; | |
36 | /* Keep track of all blocks with a doubly-linked list. Needed for | |
37 | block invalidation if the source object file has been freed. */ | |
38 | struct blpy_block_object *prev; | |
39 | struct blpy_block_object *next; | |
40 | } block_object; | |
41 | ||
42 | typedef struct { | |
43 | PyObject_HEAD | |
44 | /* The block dictionary of symbols. */ | |
45 | struct dictionary *dict; | |
46 | /* The iterator for that dictionary. */ | |
47 | struct dict_iterator iter; | |
48 | /* Has the iterator been initialized flag. */ | |
49 | int initialized_p; | |
50 | /* Pointer back to the original source block object. Needed to | |
51 | check if the block is still valid, and has not been invalidated | |
52 | when an object file has been freed. */ | |
53 | struct blpy_block_object *source; | |
54 | } block_syms_iterator_object; | |
55 | ||
56 | /* Require a valid block. All access to block_object->block should be | |
57 | gated by this call. */ | |
58 | #define BLPY_REQUIRE_VALID(block_obj, block) \ | |
59 | do { \ | |
60 | block = block_object_to_block (block_obj); \ | |
61 | if (block == NULL) \ | |
62 | { \ | |
63 | PyErr_SetString (PyExc_RuntimeError, \ | |
64 | _("Block is invalid.")); \ | |
65 | return NULL; \ | |
66 | } \ | |
67 | } while (0) | |
68 | ||
69 | /* Require a valid block. This macro is called during block iterator | |
70 | creation, and at each next call. */ | |
71 | #define BLPY_ITER_REQUIRE_VALID(block_obj) \ | |
72 | do { \ | |
73 | if (block_obj->block == NULL) \ | |
74 | { \ | |
75 | PyErr_SetString (PyExc_RuntimeError, \ | |
76 | _("Source block for iterator is invalid.")); \ | |
77 | return NULL; \ | |
78 | } \ | |
79 | } while (0) | |
80 | ||
81 | static PyTypeObject block_syms_iterator_object_type; | |
82 | static const struct objfile_data *blpy_objfile_data_key; | |
83 | ||
84 | static PyObject * | |
85 | blpy_iter (PyObject *self) | |
86 | { | |
87 | block_syms_iterator_object *block_iter_obj; | |
88 | struct block *block = NULL; | |
89 | ||
90 | BLPY_REQUIRE_VALID (self, block); | |
91 | ||
92 | block_iter_obj = PyObject_New (block_syms_iterator_object, | |
93 | &block_syms_iterator_object_type); | |
94 | if (block_iter_obj == NULL) | |
95 | return NULL; | |
96 | ||
97 | block_iter_obj->dict = BLOCK_DICT (block); | |
98 | block_iter_obj->initialized_p = 0; | |
99 | Py_INCREF (self); | |
100 | block_iter_obj->source = (block_object *) self; | |
101 | ||
102 | return (PyObject *) block_iter_obj; | |
103 | } | |
104 | ||
105 | static PyObject * | |
106 | blpy_get_start (PyObject *self, void *closure) | |
107 | { | |
108 | struct block *block = NULL; | |
109 | ||
110 | BLPY_REQUIRE_VALID (self, block); | |
111 | ||
112 | return PyLong_FromUnsignedLongLong (BLOCK_START (block)); | |
113 | } | |
114 | ||
115 | static PyObject * | |
116 | blpy_get_end (PyObject *self, void *closure) | |
117 | { | |
118 | struct block *block = NULL; | |
119 | ||
120 | BLPY_REQUIRE_VALID (self, block); | |
121 | ||
122 | return PyLong_FromUnsignedLongLong (BLOCK_END (block)); | |
123 | } | |
124 | ||
125 | static PyObject * | |
126 | blpy_get_function (PyObject *self, void *closure) | |
127 | { | |
128 | struct symbol *sym; | |
129 | struct block *block = NULL; | |
130 | ||
131 | BLPY_REQUIRE_VALID (self, block); | |
132 | ||
133 | sym = BLOCK_FUNCTION (block); | |
134 | if (sym) | |
135 | return symbol_to_symbol_object (sym); | |
136 | ||
137 | Py_RETURN_NONE; | |
138 | } | |
139 | ||
140 | static PyObject * | |
141 | blpy_get_superblock (PyObject *self, void *closure) | |
142 | { | |
143 | struct block *block = NULL; | |
144 | struct block *super_block = NULL; | |
145 | block_object *self_obj = (block_object *) self; | |
146 | ||
147 | BLPY_REQUIRE_VALID (self, block); | |
148 | ||
149 | super_block = BLOCK_SUPERBLOCK (block); | |
150 | if (super_block) | |
151 | return block_to_block_object (super_block, self_obj->objfile); | |
152 | ||
153 | Py_RETURN_NONE; | |
154 | } | |
155 | ||
156 | static void | |
157 | blpy_dealloc (PyObject *obj) | |
158 | { | |
159 | block_object *block = (block_object *) obj; | |
160 | ||
161 | if (block->prev) | |
162 | block->prev->next = block->next; | |
163 | else if (block->objfile) | |
164 | { | |
165 | set_objfile_data (block->objfile, blpy_objfile_data_key, | |
166 | block->next); | |
167 | } | |
168 | if (block->next) | |
169 | block->next->prev = block->prev; | |
170 | block->block = NULL; | |
171 | } | |
172 | ||
173 | /* Given a block, and a block_object that has previously been | |
174 | allocated and initialized, populate the block_object with the | |
175 | struct block data. Also, register the block_object life-cycle | |
176 | with the life-cycle of the the object file associated with this | |
177 | block, if needed. */ | |
178 | static void | |
179 | set_block (block_object *obj, struct block *block, | |
180 | struct objfile *objfile) | |
181 | { | |
182 | obj->block = block; | |
183 | obj->prev = NULL; | |
184 | if (objfile) | |
185 | { | |
186 | obj->objfile = objfile; | |
187 | obj->next = objfile_data (objfile, blpy_objfile_data_key); | |
188 | if (obj->next) | |
189 | obj->next->prev = obj; | |
190 | set_objfile_data (objfile, blpy_objfile_data_key, obj); | |
191 | } | |
192 | else | |
193 | obj->next = NULL; | |
194 | } | |
195 | ||
196 | /* Create a new block object (gdb.Block) that encapsulates the struct | |
197 | block object from GDB. */ | |
198 | PyObject * | |
199 | block_to_block_object (struct block *block, struct objfile *objfile) | |
200 | { | |
201 | block_object *block_obj; | |
202 | ||
203 | block_obj = PyObject_New (block_object, &block_object_type); | |
204 | if (block_obj) | |
205 | set_block (block_obj, block, objfile); | |
206 | ||
207 | return (PyObject *) block_obj; | |
208 | } | |
209 | ||
210 | /* Return struct block reference that is wrapped by this object. */ | |
211 | struct block * | |
212 | block_object_to_block (PyObject *obj) | |
213 | { | |
214 | if (! PyObject_TypeCheck (obj, &block_object_type)) | |
215 | return NULL; | |
216 | return ((block_object *) obj)->block; | |
217 | } | |
218 | ||
219 | /* Return a reference to the block iterator. */ | |
220 | static PyObject * | |
221 | blpy_block_syms_iter (PyObject *self) | |
222 | { | |
223 | block_syms_iterator_object *iter_obj = (block_syms_iterator_object *) self; | |
224 | ||
225 | BLPY_ITER_REQUIRE_VALID (iter_obj->source); | |
226 | ||
227 | Py_INCREF (self); | |
228 | return self; | |
229 | } | |
230 | ||
231 | /* Return the next symbol in the iteration through the block's | |
232 | dictionary. */ | |
233 | static PyObject * | |
234 | blpy_block_syms_iternext (PyObject *self) | |
235 | { | |
236 | block_syms_iterator_object *iter_obj = (block_syms_iterator_object *) self; | |
237 | struct symbol *sym; | |
238 | ||
239 | BLPY_ITER_REQUIRE_VALID (iter_obj->source); | |
240 | ||
241 | if (!iter_obj->initialized_p) | |
242 | { | |
243 | sym = dict_iterator_first (iter_obj->dict, &(iter_obj->iter)); | |
244 | iter_obj->initialized_p = 1; | |
245 | } | |
246 | else | |
247 | sym = dict_iterator_next (&(iter_obj->iter)); | |
248 | ||
249 | if (sym == NULL) | |
250 | { | |
044c0f87 | 251 | PyErr_SetString (PyExc_StopIteration, _("Symbol is null.")); |
f3e9a817 PM |
252 | return NULL; |
253 | } | |
254 | ||
255 | return symbol_to_symbol_object (sym); | |
256 | } | |
257 | ||
258 | static void | |
259 | blpy_block_syms_dealloc (PyObject *obj) | |
260 | { | |
261 | block_syms_iterator_object *iter_obj = (block_syms_iterator_object *) obj; | |
d59b6f6c | 262 | |
f3e9a817 PM |
263 | Py_XDECREF (iter_obj->source); |
264 | } | |
265 | ||
266 | /* Return the innermost lexical block containing the specified pc value, | |
267 | or 0 if there is none. */ | |
268 | PyObject * | |
269 | gdbpy_block_for_pc (PyObject *self, PyObject *args) | |
270 | { | |
271 | unsigned PY_LONG_LONG pc; | |
272 | struct block *block; | |
273 | struct obj_section *section; | |
274 | struct symtab *symtab; | |
f3e9a817 PM |
275 | |
276 | if (!PyArg_ParseTuple (args, "K", &pc)) | |
277 | return NULL; | |
278 | ||
279 | section = find_pc_mapped_section (pc); | |
280 | symtab = find_pc_sect_symtab (pc, section); | |
281 | if (!symtab || symtab->objfile == NULL) | |
282 | { | |
283 | PyErr_SetString (PyExc_RuntimeError, | |
044c0f87 | 284 | _("Cannot locate object file for block.")); |
f3e9a817 PM |
285 | return NULL; |
286 | } | |
287 | ||
288 | block = block_for_pc (pc); | |
289 | if (block) | |
290 | return block_to_block_object (block, symtab->objfile); | |
291 | ||
292 | Py_RETURN_NONE; | |
293 | } | |
294 | ||
295 | /* This function is called when an objfile is about to be freed. | |
296 | Invalidate the block as further actions on the block would result | |
297 | in bad data. All access to obj->symbol should be gated by | |
298 | BLPY_REQUIRE_VALID which will raise an exception on invalid | |
299 | blocks. */ | |
300 | static void | |
301 | del_objfile_blocks (struct objfile *objfile, void *datum) | |
302 | { | |
303 | block_object *obj = datum; | |
d59b6f6c | 304 | |
f3e9a817 PM |
305 | while (obj) |
306 | { | |
307 | block_object *next = obj->next; | |
308 | ||
309 | obj->block = NULL; | |
310 | obj->objfile = NULL; | |
311 | obj->next = NULL; | |
312 | obj->prev = NULL; | |
313 | ||
314 | obj = next; | |
315 | } | |
316 | } | |
317 | ||
318 | void | |
319 | gdbpy_initialize_blocks (void) | |
320 | { | |
321 | block_object_type.tp_new = PyType_GenericNew; | |
322 | if (PyType_Ready (&block_object_type) < 0) | |
323 | return; | |
324 | ||
325 | block_syms_iterator_object_type.tp_new = PyType_GenericNew; | |
326 | if (PyType_Ready (&block_syms_iterator_object_type) < 0) | |
327 | return; | |
328 | ||
329 | /* Register an objfile "free" callback so we can properly | |
330 | invalidate blocks when an object file is about to be | |
331 | deleted. */ | |
332 | blpy_objfile_data_key | |
333 | = register_objfile_data_with_cleanup (NULL, del_objfile_blocks); | |
334 | ||
335 | Py_INCREF (&block_object_type); | |
336 | PyModule_AddObject (gdb_module, "Block", (PyObject *) &block_object_type); | |
337 | ||
338 | Py_INCREF (&block_syms_iterator_object_type); | |
339 | PyModule_AddObject (gdb_module, "BlockIterator", | |
340 | (PyObject *) &block_syms_iterator_object_type); | |
341 | } | |
342 | ||
343 | \f | |
344 | ||
345 | static PyGetSetDef block_object_getset[] = { | |
346 | { "start", blpy_get_start, NULL, "Start address of the block.", NULL }, | |
347 | { "end", blpy_get_end, NULL, "End address of the block.", NULL }, | |
348 | { "function", blpy_get_function, NULL, | |
349 | "Symbol that names the block, or None.", NULL }, | |
350 | { "superblock", blpy_get_superblock, NULL, | |
351 | "Block containing the block, or None.", NULL }, | |
352 | { NULL } /* Sentinel */ | |
353 | }; | |
354 | ||
355 | PyTypeObject block_object_type = { | |
356 | PyObject_HEAD_INIT (NULL) | |
357 | 0, /*ob_size*/ | |
358 | "gdb.Block", /*tp_name*/ | |
359 | sizeof (block_object), /*tp_basicsize*/ | |
360 | 0, /*tp_itemsize*/ | |
361 | blpy_dealloc, /*tp_dealloc*/ | |
362 | 0, /*tp_print*/ | |
363 | 0, /*tp_getattr*/ | |
364 | 0, /*tp_setattr*/ | |
365 | 0, /*tp_compare*/ | |
366 | 0, /*tp_repr*/ | |
367 | 0, /*tp_as_number*/ | |
368 | 0, /*tp_as_sequence*/ | |
369 | 0, /*tp_as_mapping*/ | |
370 | 0, /*tp_hash */ | |
371 | 0, /*tp_call*/ | |
372 | 0, /*tp_str*/ | |
373 | 0, /*tp_getattro*/ | |
374 | 0, /*tp_setattro*/ | |
375 | 0, /*tp_as_buffer*/ | |
376 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER, /*tp_flags*/ | |
377 | "GDB block object", /* tp_doc */ | |
378 | 0, /* tp_traverse */ | |
379 | 0, /* tp_clear */ | |
380 | 0, /* tp_richcompare */ | |
381 | 0, /* tp_weaklistoffset */ | |
382 | blpy_iter, /* tp_iter */ | |
383 | 0, /* tp_iternext */ | |
384 | 0, /* tp_methods */ | |
385 | 0, /* tp_members */ | |
386 | block_object_getset /* tp_getset */ | |
387 | }; | |
388 | ||
389 | static PyTypeObject block_syms_iterator_object_type = { | |
390 | PyObject_HEAD_INIT (NULL) | |
391 | 0, /*ob_size*/ | |
392 | "gdb.BlockIterator", /*tp_name*/ | |
393 | sizeof (block_syms_iterator_object), /*tp_basicsize*/ | |
394 | 0, /*tp_itemsize*/ | |
395 | blpy_block_syms_dealloc, /*tp_dealloc*/ | |
396 | 0, /*tp_print*/ | |
397 | 0, /*tp_getattr*/ | |
398 | 0, /*tp_setattr*/ | |
399 | 0, /*tp_compare*/ | |
400 | 0, /*tp_repr*/ | |
401 | 0, /*tp_as_number*/ | |
402 | 0, /*tp_as_sequence*/ | |
403 | 0, /*tp_as_mapping*/ | |
404 | 0, /*tp_hash */ | |
405 | 0, /*tp_call*/ | |
406 | 0, /*tp_str*/ | |
407 | 0, /*tp_getattro*/ | |
408 | 0, /*tp_setattro*/ | |
409 | 0, /*tp_as_buffer*/ | |
410 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER, /*tp_flags*/ | |
411 | "GDB block syms iterator object", /*tp_doc */ | |
412 | 0, /*tp_traverse */ | |
413 | 0, /*tp_clear */ | |
414 | 0, /*tp_richcompare */ | |
415 | 0, /*tp_weaklistoffset */ | |
416 | blpy_block_syms_iter, /*tp_iter */ | |
417 | blpy_block_syms_iternext, /*tp_iternext */ | |
418 | 0 /*tp_methods */ | |
419 | }; |