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comparison src/share/vm/prims/jvmtiManageCapabilities.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24 # include "incls/_precompiled.incl"
25 # include "incls/_jvmtiManageCapabilities.cpp.incl"
26
27 static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8;
28
29 // capabilities which are always potentially available
30 jvmtiCapabilities JvmtiManageCapabilities::always_capabilities;
31
32 // capabilities which are potentially available during OnLoad
33 jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities;
34
35 // capabilities which are always potentially available
36 // but to only one environment
37 jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;
38
39 // capabilities which are potentially available during OnLoad
40 // but to only one environment
41 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;
42
43 // remaining capabilities which are always potentially available
44 // but to only one environment
45 jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;
46
47 // remaining capabilities which are potentially available during OnLoad
48 // but to only one environment
49 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;
50
51 // all capabilities ever acquired
52 jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;
53
54 void JvmtiManageCapabilities::initialize() {
55 always_capabilities = init_always_capabilities();
56 if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) {
57 recompute_always_capabilities();
58 }
59 onload_capabilities = init_onload_capabilities();
60 always_solo_capabilities = init_always_solo_capabilities();
61 onload_solo_capabilities = init_onload_solo_capabilities();
62 always_solo_remaining_capabilities = init_always_solo_capabilities();
63 onload_solo_remaining_capabilities = init_onload_solo_capabilities();
64 memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
65 }
66
67 // if the capability sets are initialized in the onload phase then
68 // it happens before class data sharing (CDS) is initialized. If it
69 // turns out that CDS gets disabled then we must adjust the always
70 // capabilities. To ensure a consistent view of the capabililties
71 // anything we add here should already be in the onload set.
72 void JvmtiManageCapabilities::recompute_always_capabilities() {
73 if (!UseSharedSpaces) {
74 jvmtiCapabilities jc = always_capabilities;
75 jc.can_generate_all_class_hook_events = 1;
76 always_capabilities = jc;
77 }
78 }
79
80
81 // corresponding init functions
82 jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
83 jvmtiCapabilities jc;
84
85 memset(&jc, 0, sizeof(jc));
86 jc.can_get_bytecodes = 1;
87 jc.can_signal_thread = 1;
88 jc.can_get_source_file_name = 1;
89 jc.can_get_line_numbers = 1;
90 jc.can_get_synthetic_attribute = 1;
91 jc.can_get_monitor_info = 1;
92 jc.can_get_constant_pool = 1;
93 jc.can_generate_monitor_events = 1;
94 jc.can_generate_garbage_collection_events = 1;
95 jc.can_generate_compiled_method_load_events = 1;
96 jc.can_generate_native_method_bind_events = 1;
97 jc.can_generate_vm_object_alloc_events = 1;
98 if (os::is_thread_cpu_time_supported()) {
99 jc.can_get_current_thread_cpu_time = 1;
100 jc.can_get_thread_cpu_time = 1;
101 }
102 jc.can_redefine_classes = 1;
103 jc.can_redefine_any_class = 1;
104 jc.can_retransform_classes = 1;
105 jc.can_retransform_any_class = 1;
106 jc.can_set_native_method_prefix = 1;
107 jc.can_tag_objects = 1;
108 jc.can_generate_object_free_events = 1;
109 jc.can_generate_resource_exhaustion_heap_events = 1;
110 jc.can_generate_resource_exhaustion_threads_events = 1;
111 return jc;
112 }
113
114 jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
115 jvmtiCapabilities jc;
116
117 memset(&jc, 0, sizeof(jc));
118 jc.can_pop_frame = 1;
119 jc.can_force_early_return = 1;
120 jc.can_get_source_debug_extension = 1;
121 jc.can_access_local_variables = 1;
122 jc.can_maintain_original_method_order = 1;
123 jc.can_generate_all_class_hook_events = 1;
124 jc.can_generate_single_step_events = 1;
125 jc.can_generate_exception_events = 1;
126 jc.can_generate_frame_pop_events = 1;
127 jc.can_generate_method_entry_events = 1;
128 jc.can_generate_method_exit_events = 1;
129 jc.can_get_owned_monitor_info = 1;
130 jc.can_get_owned_monitor_stack_depth_info = 1;
131 jc.can_get_current_contended_monitor = 1;
132 // jc.can_get_monitor_info = 1;
133 jc.can_tag_objects = 1; // TODO: this should have been removed
134 jc.can_generate_object_free_events = 1; // TODO: this should have been removed
135 return jc;
136 }
137
138
139 jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() {
140 jvmtiCapabilities jc;
141
142 memset(&jc, 0, sizeof(jc));
143 jc.can_suspend = 1;
144 return jc;
145 }
146
147
148 jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() {
149 jvmtiCapabilities jc;
150
151 memset(&jc, 0, sizeof(jc));
152 jc.can_generate_field_modification_events = 1;
153 jc.can_generate_field_access_events = 1;
154 jc.can_generate_breakpoint_events = 1;
155 return jc;
156 }
157
158
159 jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
160 jvmtiCapabilities *result) {
161 char *ap = (char *)a;
162 char *bp = (char *)b;
163 char *resultp = (char *)result;
164
165 for (int i = 0; i < CAPA_SIZE; ++i) {
166 *resultp++ = *ap++ | *bp++;
167 }
168
169 return result;
170 }
171
172
173 jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
174 jvmtiCapabilities *result) {
175 char *ap = (char *)a;
176 char *bp = (char *)b;
177 char *resultp = (char *)result;
178
179 for (int i = 0; i < CAPA_SIZE; ++i) {
180 *resultp++ = *ap++ & *bp++;
181 }
182
183 return result;
184 }
185
186
187 jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
188 jvmtiCapabilities *result) {
189 char *ap = (char *)a;
190 char *bp = (char *)b;
191 char *resultp = (char *)result;
192
193 for (int i = 0; i < CAPA_SIZE; ++i) {
194 *resultp++ = *ap++ & ~*bp++;
195 }
196
197 return result;
198 }
199
200
201 bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) {
202 char *ap = (char *)a;
203
204 for (int i = 0; i < CAPA_SIZE; ++i) {
205 if (*ap++ != 0) {
206 return true;
207 }
208 }
209
210 return false;
211 }
212
213
214 void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) {
215 char *ap = (char *)from;
216 char *resultp = (char *)to;
217
218 for (int i = 0; i < CAPA_SIZE; ++i) {
219 *resultp++ = *ap++;
220 }
221 }
222
223
224 void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current,
225 const jvmtiCapabilities *prohibited,
226 jvmtiCapabilities *result) {
227 // exclude prohibited capabilities, must be before adding current
228 exclude(&always_capabilities, prohibited, result);
229
230 // must include current since it may possess solo capabilities and now prohibited
231 either(result, current, result);
232
233 // add other remaining
234 either(result, &always_solo_remaining_capabilities, result);
235
236 // if this is during OnLoad more capabilities are available
237 if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
238 either(result, &onload_capabilities, result);
239 either(result, &onload_solo_remaining_capabilities, result);
240 }
241 }
242
243 jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current,
244 const jvmtiCapabilities *prohibited,
245 const jvmtiCapabilities *desired,
246 jvmtiCapabilities *result) {
247 // check that the capabilities being added are potential capabilities
248 jvmtiCapabilities temp;
249 get_potential_capabilities(current, prohibited, &temp);
250 if (has_some(exclude(desired, &temp, &temp))) {
251 return JVMTI_ERROR_NOT_AVAILABLE;
252 }
253
254 // add to the set of ever acquired capabilities
255 either(&acquired_capabilities, desired, &acquired_capabilities);
256
257 // onload capabilities that got added are now permanent - so, also remove from onload
258 both(&onload_capabilities, desired, &temp);
259 either(&always_capabilities, &temp, &always_capabilities);
260 exclude(&onload_capabilities, &temp, &onload_capabilities);
261
262 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
263 both(&onload_solo_capabilities, desired, &temp);
264 either(&always_solo_capabilities, &temp, &always_solo_capabilities);
265 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);
266
267 // remove solo capabilities that are now taken
268 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
269 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);
270
271 // return the result
272 either(current, desired, result);
273
274 update();
275
276 return JVMTI_ERROR_NONE;
277 }
278
279
280 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
281 const jvmtiCapabilities *unwanted,
282 jvmtiCapabilities *result) {
283 jvmtiCapabilities to_trash;
284 jvmtiCapabilities temp;
285
286 // can't give up what you don't have
287 both(current, unwanted, &to_trash);
288
289 // restore solo capabilities but only those that belong
290 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
291 &always_solo_remaining_capabilities);
292 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
293 &onload_solo_remaining_capabilities);
294
295 update();
296
297 // return the result
298 exclude(current, unwanted, result);
299 }
300
301
302 void JvmtiManageCapabilities::update() {
303 jvmtiCapabilities avail;
304
305 // all capabilities
306 either(&always_capabilities, &always_solo_capabilities, &avail);
307
308 bool interp_events =
309 avail.can_generate_field_access_events ||
310 avail.can_generate_field_modification_events ||
311 avail.can_generate_single_step_events ||
312 avail.can_generate_frame_pop_events ||
313 avail.can_generate_method_entry_events ||
314 avail.can_generate_method_exit_events;
315 bool enter_all_methods =
316 interp_events ||
317 avail.can_generate_breakpoint_events;
318 UseFastEmptyMethods = !enter_all_methods;
319 UseFastAccessorMethods = !enter_all_methods;
320
321 if (avail.can_generate_breakpoint_events) {
322 RewriteFrequentPairs = false;
323 }
324
325 // If can_redefine_classes is enabled in the onload phase then we know that the
326 // dependency information recorded by the compiler is complete.
327 if ((avail.can_redefine_classes || avail.can_retransform_classes) &&
328 JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
329 JvmtiExport::set_all_dependencies_are_recorded(true);
330 }
331
332 JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension);
333 JvmtiExport::set_can_examine_or_deopt_anywhere(
334 avail.can_generate_breakpoint_events ||
335 interp_events ||
336 avail.can_redefine_classes ||
337 avail.can_retransform_classes ||
338 avail.can_access_local_variables ||
339 avail.can_get_owned_monitor_info ||
340 avail.can_get_current_contended_monitor ||
341 avail.can_get_monitor_info ||
342 avail.can_get_owned_monitor_stack_depth_info);
343 JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order);
344 JvmtiExport::set_can_post_interpreter_events(interp_events);
345 JvmtiExport::set_can_hotswap_or_post_breakpoint(
346 avail.can_generate_breakpoint_events ||
347 avail.can_redefine_classes ||
348 avail.can_retransform_classes);
349 JvmtiExport::set_can_modify_any_class(
350 avail.can_generate_breakpoint_events ||
351 avail.can_generate_all_class_hook_events);
352 JvmtiExport::set_can_walk_any_space(
353 avail.can_tag_objects); // disable sharing in onload phase
354 JvmtiExport::set_can_access_local_variables(
355 avail.can_access_local_variables ||
356 avail.can_redefine_classes ||
357 avail.can_retransform_classes);
358 JvmtiExport::set_can_post_exceptions(
359 avail.can_generate_exception_events ||
360 avail.can_generate_frame_pop_events ||
361 avail.can_generate_method_exit_events);
362 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
363 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
364 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
365 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
366 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
367 avail.can_generate_frame_pop_events);
368 JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
369 JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
370 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
371 }
372
373 #ifndef PRODUCT
374
375 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
376 tty->print_cr("----- capabilities -----");
377 if (cap->can_tag_objects)
378 tty->print_cr("can_tag_objects");
379 if (cap->can_generate_field_modification_events)
380 tty->print_cr("can_generate_field_modification_events");
381 if (cap->can_generate_field_access_events)
382 tty->print_cr("can_generate_field_access_events");
383 if (cap->can_get_bytecodes)
384 tty->print_cr("can_get_bytecodes");
385 if (cap->can_get_synthetic_attribute)
386 tty->print_cr("can_get_synthetic_attribute");
387 if (cap->can_get_owned_monitor_info)
388 tty->print_cr("can_get_owned_monitor_info");
389 if (cap->can_get_current_contended_monitor)
390 tty->print_cr("can_get_current_contended_monitor");
391 if (cap->can_get_monitor_info)
392 tty->print_cr("can_get_monitor_info");
393 if (cap->can_get_constant_pool)
394 tty->print_cr("can_get_constant_pool");
395 if (cap->can_pop_frame)
396 tty->print_cr("can_pop_frame");
397 if (cap->can_force_early_return)
398 tty->print_cr("can_force_early_return");
399 if (cap->can_redefine_classes)
400 tty->print_cr("can_redefine_classes");
401 if (cap->can_retransform_classes)
402 tty->print_cr("can_retransform_classes");
403 if (cap->can_signal_thread)
404 tty->print_cr("can_signal_thread");
405 if (cap->can_get_source_file_name)
406 tty->print_cr("can_get_source_file_name");
407 if (cap->can_get_line_numbers)
408 tty->print_cr("can_get_line_numbers");
409 if (cap->can_get_source_debug_extension)
410 tty->print_cr("can_get_source_debug_extension");
411 if (cap->can_access_local_variables)
412 tty->print_cr("can_access_local_variables");
413 if (cap->can_maintain_original_method_order)
414 tty->print_cr("can_maintain_original_method_order");
415 if (cap->can_generate_single_step_events)
416 tty->print_cr("can_generate_single_step_events");
417 if (cap->can_generate_exception_events)
418 tty->print_cr("can_generate_exception_events");
419 if (cap->can_generate_frame_pop_events)
420 tty->print_cr("can_generate_frame_pop_events");
421 if (cap->can_generate_breakpoint_events)
422 tty->print_cr("can_generate_breakpoint_events");
423 if (cap->can_suspend)
424 tty->print_cr("can_suspend");
425 if (cap->can_redefine_any_class )
426 tty->print_cr("can_redefine_any_class");
427 if (cap->can_retransform_any_class )
428 tty->print_cr("can_retransform_any_class");
429 if (cap->can_get_current_thread_cpu_time)
430 tty->print_cr("can_get_current_thread_cpu_time");
431 if (cap->can_get_thread_cpu_time)
432 tty->print_cr("can_get_thread_cpu_time");
433 if (cap->can_generate_method_entry_events)
434 tty->print_cr("can_generate_method_entry_events");
435 if (cap->can_generate_method_exit_events)
436 tty->print_cr("can_generate_method_exit_events");
437 if (cap->can_generate_all_class_hook_events)
438 tty->print_cr("can_generate_all_class_hook_events");
439 if (cap->can_generate_compiled_method_load_events)
440 tty->print_cr("can_generate_compiled_method_load_events");
441 if (cap->can_generate_monitor_events)
442 tty->print_cr("can_generate_monitor_events");
443 if (cap->can_generate_vm_object_alloc_events)
444 tty->print_cr("can_generate_vm_object_alloc_events");
445 if (cap->can_generate_native_method_bind_events)
446 tty->print_cr("can_generate_native_method_bind_events");
447 if (cap->can_generate_garbage_collection_events)
448 tty->print_cr("can_generate_garbage_collection_events");
449 if (cap->can_generate_object_free_events)
450 tty->print_cr("can_generate_object_free_events");
451 if (cap->can_generate_resource_exhaustion_heap_events)
452 tty->print_cr("can_generate_resource_exhaustion_heap_events");
453 if (cap->can_generate_resource_exhaustion_threads_events)
454 tty->print_cr("can_generate_resource_exhaustion_threads_events");
455 }
456
457 #endif