1 /*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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 #ifndef CC_INTERP
119 jc.can_pop_frame = 1;
120 jc.can_force_early_return = 1;
121 #endif // !CC_INTERP
122 jc.can_get_source_debug_extension = 1;
123 jc.can_access_local_variables = 1;
124 jc.can_maintain_original_method_order = 1;
125 jc.can_generate_all_class_hook_events = 1;
126 jc.can_generate_single_step_events = 1;
127 jc.can_generate_exception_events = 1;
128 jc.can_generate_frame_pop_events = 1;
129 jc.can_generate_method_entry_events = 1;
130 jc.can_generate_method_exit_events = 1;
131 jc.can_get_owned_monitor_info = 1;
132 jc.can_get_owned_monitor_stack_depth_info = 1;
133 jc.can_get_current_contended_monitor = 1;
134 // jc.can_get_monitor_info = 1;
135 jc.can_tag_objects = 1; // TODO: this should have been removed
136 jc.can_generate_object_free_events = 1; // TODO: this should have been removed
137 return jc;
138 }
139
140
141 jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() {
142 jvmtiCapabilities jc;
143
144 memset(&jc, 0, sizeof(jc));
145 jc.can_suspend = 1;
146 return jc;
147 }
148
149
150 jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() {
151 jvmtiCapabilities jc;
152
153 memset(&jc, 0, sizeof(jc));
154 jc.can_generate_field_modification_events = 1;
155 jc.can_generate_field_access_events = 1;
156 jc.can_generate_breakpoint_events = 1;
157 return jc;
158 }
159
160
161 jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
162 jvmtiCapabilities *result) {
163 char *ap = (char *)a;
164 char *bp = (char *)b;
165 char *resultp = (char *)result;
166
167 for (int i = 0; i < CAPA_SIZE; ++i) {
168 *resultp++ = *ap++ | *bp++;
169 }
170
171 return result;
172 }
173
174
175 jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
176 jvmtiCapabilities *result) {
177 char *ap = (char *)a;
178 char *bp = (char *)b;
179 char *resultp = (char *)result;
180
181 for (int i = 0; i < CAPA_SIZE; ++i) {
182 *resultp++ = *ap++ & *bp++;
183 }
184
185 return result;
186 }
187
188
189 jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
190 jvmtiCapabilities *result) {
191 char *ap = (char *)a;
192 char *bp = (char *)b;
193 char *resultp = (char *)result;
194
195 for (int i = 0; i < CAPA_SIZE; ++i) {
196 *resultp++ = *ap++ & ~*bp++;
197 }
198
199 return result;
200 }
201
202
203 bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) {
204 char *ap = (char *)a;
205
206 for (int i = 0; i < CAPA_SIZE; ++i) {
207 if (*ap++ != 0) {
208 return true;
209 }
210 }
211
212 return false;
213 }
214
215
216 void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) {
217 char *ap = (char *)from;
218 char *resultp = (char *)to;
219
220 for (int i = 0; i < CAPA_SIZE; ++i) {
221 *resultp++ = *ap++;
222 }
223 }
224
225
226 void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current,
227 const jvmtiCapabilities *prohibited,
228 jvmtiCapabilities *result) {
229 // exclude prohibited capabilities, must be before adding current
230 exclude(&always_capabilities, prohibited, result);
231
232 // must include current since it may possess solo capabilities and now prohibited
233 either(result, current, result);
234
235 // add other remaining
236 either(result, &always_solo_remaining_capabilities, result);
237
238 // if this is during OnLoad more capabilities are available
239 if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
240 either(result, &onload_capabilities, result);
241 either(result, &onload_solo_remaining_capabilities, result);
242 }
243 }
244
245 jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current,
246 const jvmtiCapabilities *prohibited,
247 const jvmtiCapabilities *desired,
248 jvmtiCapabilities *result) {
249 // check that the capabilities being added are potential capabilities
250 jvmtiCapabilities temp;
251 get_potential_capabilities(current, prohibited, &temp);
252 if (has_some(exclude(desired, &temp, &temp))) {
253 return JVMTI_ERROR_NOT_AVAILABLE;
254 }
255
256 // add to the set of ever acquired capabilities
257 either(&acquired_capabilities, desired, &acquired_capabilities);
258
259 // onload capabilities that got added are now permanent - so, also remove from onload
260 both(&onload_capabilities, desired, &temp);
261 either(&always_capabilities, &temp, &always_capabilities);
262 exclude(&onload_capabilities, &temp, &onload_capabilities);
263
264 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
265 both(&onload_solo_capabilities, desired, &temp);
266 either(&always_solo_capabilities, &temp, &always_solo_capabilities);
267 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);
268
269 // remove solo capabilities that are now taken
270 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
271 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);
272
273 // return the result
274 either(current, desired, result);
275
276 update();
277
278 return JVMTI_ERROR_NONE;
279 }
280
281
282 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
283 const jvmtiCapabilities *unwanted,
284 jvmtiCapabilities *result) {
285 jvmtiCapabilities to_trash;
286 jvmtiCapabilities temp;
287
288 // can't give up what you don't have
289 both(current, unwanted, &to_trash);
290
291 // restore solo capabilities but only those that belong
292 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
293 &always_solo_remaining_capabilities);
294 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
295 &onload_solo_remaining_capabilities);
296
297 update();
298
299 // return the result
300 exclude(current, unwanted, result);
301 }
302
303
304 void JvmtiManageCapabilities::update() {
305 jvmtiCapabilities avail;
306
307 // all capabilities
308 either(&always_capabilities, &always_solo_capabilities, &avail);
309
310 bool interp_events =
311 avail.can_generate_field_access_events ||
312 avail.can_generate_field_modification_events ||
313 avail.can_generate_single_step_events ||
314 avail.can_generate_frame_pop_events ||
315 avail.can_generate_method_entry_events ||
316 avail.can_generate_method_exit_events;
317 bool enter_all_methods =
318 interp_events ||
319 avail.can_generate_breakpoint_events;
320 UseFastEmptyMethods = !enter_all_methods;
321 UseFastAccessorMethods = !enter_all_methods;
322
323 if (avail.can_generate_breakpoint_events) {
324 RewriteFrequentPairs = false;
325 }
326
327 // If can_redefine_classes is enabled in the onload phase then we know that the
328 // dependency information recorded by the compiler is complete.
329 if ((avail.can_redefine_classes || avail.can_retransform_classes) &&
330 JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
331 JvmtiExport::set_all_dependencies_are_recorded(true);
332 }
333
334 JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension);
335 JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order);
336 JvmtiExport::set_can_post_interpreter_events(interp_events);
337 JvmtiExport::set_can_hotswap_or_post_breakpoint(
338 avail.can_generate_breakpoint_events ||
339 avail.can_redefine_classes ||
340 avail.can_retransform_classes);
341 JvmtiExport::set_can_modify_any_class(
342 avail.can_generate_breakpoint_events ||
343 avail.can_generate_all_class_hook_events);
344 JvmtiExport::set_can_walk_any_space(
345 avail.can_tag_objects); // disable sharing in onload phase
346 // This controls whether the compilers keep extra locals live to
347 // improve the debugging experience so only set them if the selected
348 // capabilities look like a debugger.
349 JvmtiExport::set_can_access_local_variables(
350 avail.can_access_local_variables ||
351 avail.can_generate_breakpoint_events ||
352 avail.can_generate_frame_pop_events);
353 JvmtiExport::set_can_post_on_exceptions(
354 avail.can_generate_exception_events ||
355 avail.can_generate_frame_pop_events ||
356 avail.can_generate_method_exit_events);
357 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
358 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
359 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
360 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
361 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
362 avail.can_generate_frame_pop_events);
363 JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
364 JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
365 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
366 }
367
368 #ifndef PRODUCT
369
370 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
371 tty->print_cr("----- capabilities -----");
372 if (cap->can_tag_objects)
373 tty->print_cr("can_tag_objects");
374 if (cap->can_generate_field_modification_events)
375 tty->print_cr("can_generate_field_modification_events");
376 if (cap->can_generate_field_access_events)
377 tty->print_cr("can_generate_field_access_events");
378 if (cap->can_get_bytecodes)
379 tty->print_cr("can_get_bytecodes");
380 if (cap->can_get_synthetic_attribute)
381 tty->print_cr("can_get_synthetic_attribute");
382 if (cap->can_get_owned_monitor_info)
383 tty->print_cr("can_get_owned_monitor_info");
384 if (cap->can_get_current_contended_monitor)
385 tty->print_cr("can_get_current_contended_monitor");
386 if (cap->can_get_monitor_info)
387 tty->print_cr("can_get_monitor_info");
388 if (cap->can_get_constant_pool)
389 tty->print_cr("can_get_constant_pool");
390 if (cap->can_pop_frame)
391 tty->print_cr("can_pop_frame");
392 if (cap->can_force_early_return)
393 tty->print_cr("can_force_early_return");
394 if (cap->can_redefine_classes)
395 tty->print_cr("can_redefine_classes");
396 if (cap->can_retransform_classes)
397 tty->print_cr("can_retransform_classes");
398 if (cap->can_signal_thread)
399 tty->print_cr("can_signal_thread");
400 if (cap->can_get_source_file_name)
401 tty->print_cr("can_get_source_file_name");
402 if (cap->can_get_line_numbers)
403 tty->print_cr("can_get_line_numbers");
404 if (cap->can_get_source_debug_extension)
405 tty->print_cr("can_get_source_debug_extension");
406 if (cap->can_access_local_variables)
407 tty->print_cr("can_access_local_variables");
408 if (cap->can_maintain_original_method_order)
409 tty->print_cr("can_maintain_original_method_order");
410 if (cap->can_generate_single_step_events)
411 tty->print_cr("can_generate_single_step_events");
412 if (cap->can_generate_exception_events)
413 tty->print_cr("can_generate_exception_events");
414 if (cap->can_generate_frame_pop_events)
415 tty->print_cr("can_generate_frame_pop_events");
416 if (cap->can_generate_breakpoint_events)
417 tty->print_cr("can_generate_breakpoint_events");
418 if (cap->can_suspend)
419 tty->print_cr("can_suspend");
420 if (cap->can_redefine_any_class )
421 tty->print_cr("can_redefine_any_class");
422 if (cap->can_retransform_any_class )
423 tty->print_cr("can_retransform_any_class");
424 if (cap->can_get_current_thread_cpu_time)
425 tty->print_cr("can_get_current_thread_cpu_time");
426 if (cap->can_get_thread_cpu_time)
427 tty->print_cr("can_get_thread_cpu_time");
428 if (cap->can_generate_method_entry_events)
429 tty->print_cr("can_generate_method_entry_events");
430 if (cap->can_generate_method_exit_events)
431 tty->print_cr("can_generate_method_exit_events");
432 if (cap->can_generate_all_class_hook_events)
433 tty->print_cr("can_generate_all_class_hook_events");
434 if (cap->can_generate_compiled_method_load_events)
435 tty->print_cr("can_generate_compiled_method_load_events");
436 if (cap->can_generate_monitor_events)
437 tty->print_cr("can_generate_monitor_events");
438 if (cap->can_generate_vm_object_alloc_events)
439 tty->print_cr("can_generate_vm_object_alloc_events");
440 if (cap->can_generate_native_method_bind_events)
441 tty->print_cr("can_generate_native_method_bind_events");
442 if (cap->can_generate_garbage_collection_events)
443 tty->print_cr("can_generate_garbage_collection_events");
444 if (cap->can_generate_object_free_events)
445 tty->print_cr("can_generate_object_free_events");
446 if (cap->can_generate_resource_exhaustion_heap_events)
447 tty->print_cr("can_generate_resource_exhaustion_heap_events");
448 if (cap->can_generate_resource_exhaustion_threads_events)
449 tty->print_cr("can_generate_resource_exhaustion_threads_events");
450 }
451
452 #endif