1 /*
2 * Copyright (c) 2003, 2016, 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
25 #include "precompiled.hpp"
26 #include "jvmtifiles/jvmtiEnv.hpp"
27 #include "prims/jvmtiExport.hpp"
28 #include "prims/jvmtiManageCapabilities.hpp"
29 static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8;
30
31 // capabilities which are always potentially available
32 jvmtiCapabilities JvmtiManageCapabilities::always_capabilities;
33
34 // capabilities which are potentially available during OnLoad
35 jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities;
36
37 // capabilities which are always potentially available
38 // but to only one environment
39 jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;
40
41 // capabilities which are potentially available during OnLoad
42 // but to only one environment
43 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;
44
45 // remaining capabilities which are always potentially available
46 // but to only one environment
47 jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;
48
49 // remaining capabilities which are potentially available during OnLoad
50 // but to only one environment
51 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;
52
53 // all capabilities ever acquired
54 jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;
55
56 void JvmtiManageCapabilities::initialize() {
57 always_capabilities = init_always_capabilities();
58 if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) {
59 recompute_always_capabilities();
60 }
61 onload_capabilities = init_onload_capabilities();
62 always_solo_capabilities = init_always_solo_capabilities();
63 onload_solo_capabilities = init_onload_solo_capabilities();
64 always_solo_remaining_capabilities = init_always_solo_capabilities();
65 onload_solo_remaining_capabilities = init_onload_solo_capabilities();
66 memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
67 }
68
69 // if the capability sets are initialized in the onload phase then
70 // it happens before class data sharing (CDS) is initialized. If it
71 // turns out that CDS gets disabled then we must adjust the always
72 // capabilities. To ensure a consistent view of the capabililties
73 // anything we add here should already be in the onload set.
74 void JvmtiManageCapabilities::recompute_always_capabilities() {
75 if (!UseSharedSpaces) {
76 jvmtiCapabilities jc = always_capabilities;
77 jc.can_generate_all_class_hook_events = 1;
78 always_capabilities = jc;
79 }
80 }
81
82
83 // corresponding init functions
84 jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
85 jvmtiCapabilities jc;
86
87 memset(&jc, 0, sizeof(jc));
88 jc.can_get_bytecodes = 1;
89 jc.can_signal_thread = 1;
90 jc.can_get_source_file_name = 1;
91 jc.can_get_line_numbers = 1;
92 jc.can_get_synthetic_attribute = 1;
93 jc.can_get_monitor_info = 1;
94 jc.can_get_constant_pool = 1;
95 jc.can_generate_monitor_events = 1;
96 jc.can_generate_garbage_collection_events = 1;
97 jc.can_generate_compiled_method_load_events = 1;
98 jc.can_generate_native_method_bind_events = 1;
99 jc.can_generate_vm_object_alloc_events = 1;
100 if (os::is_thread_cpu_time_supported()) {
101 jc.can_get_current_thread_cpu_time = 1;
102 jc.can_get_thread_cpu_time = 1;
103 }
104 jc.can_redefine_classes = 1;
105 jc.can_redefine_any_class = 1;
106 jc.can_retransform_classes = 1;
107 jc.can_retransform_any_class = 1;
108 jc.can_set_native_method_prefix = 1;
109 jc.can_tag_objects = 1;
110 jc.can_generate_object_free_events = 1;
111 jc.can_generate_resource_exhaustion_heap_events = 1;
112 jc.can_generate_resource_exhaustion_threads_events = 1;
113 return jc;
114 }
115
116 jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
117 jvmtiCapabilities jc;
118
119 memset(&jc, 0, sizeof(jc));
120 #ifndef ZERO
121 jc.can_pop_frame = 1;
122 jc.can_force_early_return = 1;
123 #endif // !ZERO
124 jc.can_get_source_debug_extension = 1;
125 jc.can_access_local_variables = 1;
126 jc.can_maintain_original_method_order = 1;
127 jc.can_generate_all_class_hook_events = 1;
128 jc.can_generate_single_step_events = 1;
129 jc.can_generate_exception_events = 1;
130 jc.can_generate_frame_pop_events = 1;
131 jc.can_generate_method_entry_events = 1;
132 jc.can_generate_method_exit_events = 1;
133 jc.can_get_owned_monitor_info = 1;
134 jc.can_get_owned_monitor_stack_depth_info = 1;
135 jc.can_get_current_contended_monitor = 1;
136 jc.can_generate_early_vmstart = 1;
137 jc.can_generate_early_class_hook_events = 1;
138 return jc;
139 }
140
141
142 jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() {
143 jvmtiCapabilities jc;
144
145 memset(&jc, 0, sizeof(jc));
146 jc.can_suspend = 1;
147 return jc;
148 }
149
150
151 jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() {
152 jvmtiCapabilities jc;
153
154 memset(&jc, 0, sizeof(jc));
155 jc.can_generate_field_modification_events = 1;
156 jc.can_generate_field_access_events = 1;
157 jc.can_generate_breakpoint_events = 1;
158 return jc;
159 }
160
161
162 jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
163 jvmtiCapabilities *result) {
164 char *ap = (char *)a;
165 char *bp = (char *)b;
166 char *resultp = (char *)result;
167
168 for (int i = 0; i < CAPA_SIZE; ++i) {
169 *resultp++ = *ap++ | *bp++;
170 }
171
172 return result;
173 }
174
175
176 jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
177 jvmtiCapabilities *result) {
178 char *ap = (char *)a;
179 char *bp = (char *)b;
180 char *resultp = (char *)result;
181
182 for (int i = 0; i < CAPA_SIZE; ++i) {
183 *resultp++ = *ap++ & *bp++;
184 }
185
186 return result;
187 }
188
189
190 jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
191 jvmtiCapabilities *result) {
192 char *ap = (char *)a;
193 char *bp = (char *)b;
194 char *resultp = (char *)result;
195
196 for (int i = 0; i < CAPA_SIZE; ++i) {
197 *resultp++ = *ap++ & ~*bp++;
198 }
199
200 return result;
201 }
202
203
204 bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) {
205 char *ap = (char *)a;
206
207 for (int i = 0; i < CAPA_SIZE; ++i) {
208 if (*ap++ != 0) {
209 return true;
210 }
211 }
212
213 return false;
214 }
215
216
217 void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) {
218 char *ap = (char *)from;
219 char *resultp = (char *)to;
220
221 for (int i = 0; i < CAPA_SIZE; ++i) {
222 *resultp++ = *ap++;
223 }
224 }
225
226
227 void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current,
228 const jvmtiCapabilities *prohibited,
229 jvmtiCapabilities *result) {
230 // exclude prohibited capabilities, must be before adding current
231 exclude(&always_capabilities, prohibited, result);
232
233 // must include current since it may possess solo capabilities and now prohibited
234 either(result, current, result);
235
236 // add other remaining
237 either(result, &always_solo_remaining_capabilities, result);
238
239 // if this is during OnLoad more capabilities are available
240 if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
241 either(result, &onload_capabilities, result);
242 either(result, &onload_solo_remaining_capabilities, result);
243 }
244 }
245
246 jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current,
247 const jvmtiCapabilities *prohibited,
248 const jvmtiCapabilities *desired,
249 jvmtiCapabilities *result) {
250 // check that the capabilities being added are potential capabilities
251 jvmtiCapabilities temp;
252 get_potential_capabilities(current, prohibited, &temp);
253 if (has_some(exclude(desired, &temp, &temp))) {
254 return JVMTI_ERROR_NOT_AVAILABLE;
255 }
256
257 // add to the set of ever acquired capabilities
258 either(&acquired_capabilities, desired, &acquired_capabilities);
259
260 // onload capabilities that got added are now permanent - so, also remove from onload
261 both(&onload_capabilities, desired, &temp);
262 either(&always_capabilities, &temp, &always_capabilities);
263 exclude(&onload_capabilities, &temp, &onload_capabilities);
264
265 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
266 both(&onload_solo_capabilities, desired, &temp);
267 either(&always_solo_capabilities, &temp, &always_solo_capabilities);
268 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);
269
270 // remove solo capabilities that are now taken
271 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
272 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);
273
274 // return the result
275 either(current, desired, result);
276
277 update();
278
279 return JVMTI_ERROR_NONE;
280 }
281
282
283 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
284 const jvmtiCapabilities *unwanted,
285 jvmtiCapabilities *result) {
286 jvmtiCapabilities to_trash;
287 jvmtiCapabilities temp;
288
289 // can't give up what you don't have
290 both(current, unwanted, &to_trash);
291
292 // restore solo capabilities but only those that belong
293 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
294 &always_solo_remaining_capabilities);
295 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
296 &onload_solo_remaining_capabilities);
297
298 update();
299
300 // return the result
301 exclude(current, unwanted, result);
302 }
303
304
305 void JvmtiManageCapabilities::update() {
306 jvmtiCapabilities avail;
307
308 // all capabilities
309 either(&always_capabilities, &always_solo_capabilities, &avail);
310
311 bool interp_events =
312 avail.can_generate_field_access_events ||
313 avail.can_generate_field_modification_events ||
314 avail.can_generate_single_step_events ||
315 avail.can_generate_frame_pop_events ||
316 avail.can_generate_method_entry_events ||
317 avail.can_generate_method_exit_events;
318 #ifdef ZERO
319 bool enter_all_methods =
320 interp_events ||
321 avail.can_generate_breakpoint_events;
322 if (enter_all_methods) {
323 // Disable these when tracking the bytecodes
324 UseFastEmptyMethods = false;
325 UseFastAccessorMethods = false;
326 }
327 #endif // ZERO
328
329 if (avail.can_generate_breakpoint_events) {
330 RewriteFrequentPairs = false;
331 }
332
333 // If can_redefine_classes is enabled in the onload phase then we know that the
334 // dependency information recorded by the compiler is complete.
335 if ((avail.can_redefine_classes || avail.can_retransform_classes) &&
336 JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
337 JvmtiExport::set_all_dependencies_are_recorded(true);
338 }
339
340 JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension);
341 JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order);
342 JvmtiExport::set_can_post_interpreter_events(interp_events);
343 JvmtiExport::set_can_hotswap_or_post_breakpoint(
344 avail.can_generate_breakpoint_events ||
345 avail.can_redefine_classes ||
346 avail.can_retransform_classes);
347 JvmtiExport::set_can_modify_any_class(
348 avail.can_generate_breakpoint_events ||
349 avail.can_generate_all_class_hook_events);
350 JvmtiExport::set_can_walk_any_space(
351 avail.can_tag_objects); // disable sharing in onload phase
352 // This controls whether the compilers keep extra locals live to
353 // improve the debugging experience so only set them if the selected
354 // capabilities look like a debugger.
355 JvmtiExport::set_can_access_local_variables(
356 avail.can_access_local_variables ||
357 avail.can_generate_breakpoint_events ||
358 avail.can_generate_frame_pop_events);
359 JvmtiExport::set_can_post_on_exceptions(
360 avail.can_generate_exception_events ||
361 avail.can_generate_frame_pop_events ||
362 avail.can_generate_method_exit_events);
363 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
364 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
365 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
366 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
367 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
368 avail.can_generate_frame_pop_events);
369 JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
370 JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
371 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
372 }
373
374 #ifndef PRODUCT
375
376 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
377 tty->print_cr("----- capabilities -----");
378 if (cap->can_tag_objects)
379 tty->print_cr("can_tag_objects");
380 if (cap->can_generate_field_modification_events)
381 tty->print_cr("can_generate_field_modification_events");
382 if (cap->can_generate_field_access_events)
383 tty->print_cr("can_generate_field_access_events");
384 if (cap->can_get_bytecodes)
385 tty->print_cr("can_get_bytecodes");
386 if (cap->can_get_synthetic_attribute)
387 tty->print_cr("can_get_synthetic_attribute");
388 if (cap->can_get_owned_monitor_info)
389 tty->print_cr("can_get_owned_monitor_info");
390 if (cap->can_get_current_contended_monitor)
391 tty->print_cr("can_get_current_contended_monitor");
392 if (cap->can_get_monitor_info)
393 tty->print_cr("can_get_monitor_info");
394 if (cap->can_get_constant_pool)
395 tty->print_cr("can_get_constant_pool");
396 if (cap->can_pop_frame)
397 tty->print_cr("can_pop_frame");
398 if (cap->can_force_early_return)
399 tty->print_cr("can_force_early_return");
400 if (cap->can_redefine_classes)
401 tty->print_cr("can_redefine_classes");
402 if (cap->can_retransform_classes)
403 tty->print_cr("can_retransform_classes");
404 if (cap->can_signal_thread)
405 tty->print_cr("can_signal_thread");
406 if (cap->can_get_source_file_name)
407 tty->print_cr("can_get_source_file_name");
408 if (cap->can_get_line_numbers)
409 tty->print_cr("can_get_line_numbers");
410 if (cap->can_get_source_debug_extension)
411 tty->print_cr("can_get_source_debug_extension");
412 if (cap->can_access_local_variables)
413 tty->print_cr("can_access_local_variables");
414 if (cap->can_maintain_original_method_order)
415 tty->print_cr("can_maintain_original_method_order");
416 if (cap->can_generate_single_step_events)
417 tty->print_cr("can_generate_single_step_events");
418 if (cap->can_generate_exception_events)
419 tty->print_cr("can_generate_exception_events");
420 if (cap->can_generate_frame_pop_events)
421 tty->print_cr("can_generate_frame_pop_events");
422 if (cap->can_generate_breakpoint_events)
423 tty->print_cr("can_generate_breakpoint_events");
424 if (cap->can_suspend)
425 tty->print_cr("can_suspend");
426 if (cap->can_redefine_any_class )
427 tty->print_cr("can_redefine_any_class");
428 if (cap->can_retransform_any_class )
429 tty->print_cr("can_retransform_any_class");
430 if (cap->can_get_current_thread_cpu_time)
431 tty->print_cr("can_get_current_thread_cpu_time");
432 if (cap->can_get_thread_cpu_time)
433 tty->print_cr("can_get_thread_cpu_time");
434 if (cap->can_generate_method_entry_events)
435 tty->print_cr("can_generate_method_entry_events");
436 if (cap->can_generate_method_exit_events)
437 tty->print_cr("can_generate_method_exit_events");
438 if (cap->can_generate_all_class_hook_events)
439 tty->print_cr("can_generate_all_class_hook_events");
440 if (cap->can_generate_compiled_method_load_events)
441 tty->print_cr("can_generate_compiled_method_load_events");
442 if (cap->can_generate_monitor_events)
443 tty->print_cr("can_generate_monitor_events");
444 if (cap->can_generate_vm_object_alloc_events)
445 tty->print_cr("can_generate_vm_object_alloc_events");
446 if (cap->can_generate_native_method_bind_events)
447 tty->print_cr("can_generate_native_method_bind_events");
448 if (cap->can_generate_garbage_collection_events)
449 tty->print_cr("can_generate_garbage_collection_events");
450 if (cap->can_generate_object_free_events)
451 tty->print_cr("can_generate_object_free_events");
452 if (cap->can_generate_resource_exhaustion_heap_events)
453 tty->print_cr("can_generate_resource_exhaustion_heap_events");
454 if (cap->can_generate_resource_exhaustion_threads_events)
455 tty->print_cr("can_generate_resource_exhaustion_threads_events");
456 if (cap->can_generate_early_vmstart)
457 tty->print_cr("can_generate_early_vmstart");
458 if (cap->can_generate_early_class_hook_events)
459 tty->print_cr("can_generate_early_class_hook_events");
460 }
461
462 #endif