Thu, 24 May 2018 17:06:56 +0800
Merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #include "precompiled.hpp" |
aoqi@0 | 26 | #include "classfile/systemDictionary.hpp" |
aoqi@0 | 27 | #include "interpreter/interpreter.hpp" |
aoqi@0 | 28 | #include "jvmtifiles/jvmtiEnv.hpp" |
aoqi@0 | 29 | #include "memory/resourceArea.hpp" |
aoqi@0 | 30 | #include "prims/jvmtiEnvThreadState.hpp" |
aoqi@0 | 31 | #include "prims/jvmtiEventController.inline.hpp" |
aoqi@0 | 32 | #include "prims/jvmtiImpl.hpp" |
aoqi@0 | 33 | #include "runtime/handles.hpp" |
aoqi@0 | 34 | #include "runtime/handles.inline.hpp" |
aoqi@0 | 35 | #include "runtime/interfaceSupport.hpp" |
aoqi@0 | 36 | #include "runtime/javaCalls.hpp" |
aoqi@0 | 37 | #include "runtime/signature.hpp" |
aoqi@0 | 38 | #include "runtime/vframe.hpp" |
aoqi@0 | 39 | #include "runtime/vm_operations.hpp" |
aoqi@0 | 40 | |
aoqi@0 | 41 | |
aoqi@0 | 42 | /////////////////////////////////////////////////////////////// |
aoqi@0 | 43 | // |
aoqi@0 | 44 | // class JvmtiFramePop |
aoqi@0 | 45 | // |
aoqi@0 | 46 | |
aoqi@0 | 47 | #ifndef PRODUCT |
aoqi@0 | 48 | void JvmtiFramePop::print() { |
aoqi@0 | 49 | tty->print_cr("_frame_number=%d", _frame_number); |
aoqi@0 | 50 | } |
aoqi@0 | 51 | #endif |
aoqi@0 | 52 | |
aoqi@0 | 53 | |
aoqi@0 | 54 | /////////////////////////////////////////////////////////////// |
aoqi@0 | 55 | // |
aoqi@0 | 56 | // class JvmtiFramePops - private methods |
aoqi@0 | 57 | // |
aoqi@0 | 58 | |
aoqi@0 | 59 | void |
aoqi@0 | 60 | JvmtiFramePops::set(JvmtiFramePop& fp) { |
aoqi@0 | 61 | if (_pops->find(fp.frame_number()) < 0) { |
aoqi@0 | 62 | _pops->append(fp.frame_number()); |
aoqi@0 | 63 | } |
aoqi@0 | 64 | } |
aoqi@0 | 65 | |
aoqi@0 | 66 | |
aoqi@0 | 67 | void |
aoqi@0 | 68 | JvmtiFramePops::clear(JvmtiFramePop& fp) { |
aoqi@0 | 69 | assert(_pops->length() > 0, "No more frame pops"); |
aoqi@0 | 70 | |
aoqi@0 | 71 | _pops->remove(fp.frame_number()); |
aoqi@0 | 72 | } |
aoqi@0 | 73 | |
aoqi@0 | 74 | |
aoqi@0 | 75 | int |
aoqi@0 | 76 | JvmtiFramePops::clear_to(JvmtiFramePop& fp) { |
aoqi@0 | 77 | int cleared = 0; |
aoqi@0 | 78 | int index = 0; |
aoqi@0 | 79 | while (index < _pops->length()) { |
aoqi@0 | 80 | JvmtiFramePop pop = JvmtiFramePop(_pops->at(index)); |
aoqi@0 | 81 | if (pop.above_on_stack(fp)) { |
aoqi@0 | 82 | _pops->remove_at(index); |
aoqi@0 | 83 | ++cleared; |
aoqi@0 | 84 | } else { |
aoqi@0 | 85 | ++index; |
aoqi@0 | 86 | } |
aoqi@0 | 87 | } |
aoqi@0 | 88 | return cleared; |
aoqi@0 | 89 | } |
aoqi@0 | 90 | |
aoqi@0 | 91 | |
aoqi@0 | 92 | /////////////////////////////////////////////////////////////// |
aoqi@0 | 93 | // |
aoqi@0 | 94 | // class JvmtiFramePops - public methods |
aoqi@0 | 95 | // |
aoqi@0 | 96 | |
aoqi@0 | 97 | JvmtiFramePops::JvmtiFramePops() { |
aoqi@0 | 98 | _pops = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int> (2, true); |
aoqi@0 | 99 | } |
aoqi@0 | 100 | |
aoqi@0 | 101 | JvmtiFramePops::~JvmtiFramePops() { |
aoqi@0 | 102 | // return memory to c_heap. |
aoqi@0 | 103 | delete _pops; |
aoqi@0 | 104 | } |
aoqi@0 | 105 | |
aoqi@0 | 106 | |
aoqi@0 | 107 | #ifndef PRODUCT |
aoqi@0 | 108 | void JvmtiFramePops::print() { |
aoqi@0 | 109 | ResourceMark rm; |
aoqi@0 | 110 | |
aoqi@0 | 111 | int n = _pops->length(); |
aoqi@0 | 112 | for (int i=0; i<n; i++) { |
aoqi@0 | 113 | JvmtiFramePop fp = JvmtiFramePop(_pops->at(i)); |
aoqi@0 | 114 | tty->print("%d: ", i); |
aoqi@0 | 115 | fp.print(); |
aoqi@0 | 116 | tty->cr(); |
aoqi@0 | 117 | } |
aoqi@0 | 118 | } |
aoqi@0 | 119 | #endif |
aoqi@0 | 120 | |
aoqi@0 | 121 | /////////////////////////////////////////////////////////////// |
aoqi@0 | 122 | // |
aoqi@0 | 123 | // class JvmtiEnvThreadState |
aoqi@0 | 124 | // |
aoqi@0 | 125 | // Instances of JvmtiEnvThreadState hang off of each JvmtiThreadState, |
aoqi@0 | 126 | // one per JvmtiEnv. |
aoqi@0 | 127 | // |
aoqi@0 | 128 | |
aoqi@0 | 129 | JvmtiEnvThreadState::JvmtiEnvThreadState(JavaThread *thread, JvmtiEnvBase *env) : |
aoqi@0 | 130 | _event_enable() { |
aoqi@0 | 131 | _thread = thread; |
aoqi@0 | 132 | _env = (JvmtiEnv*)env; |
aoqi@0 | 133 | _next = NULL; |
aoqi@0 | 134 | _frame_pops = NULL; |
aoqi@0 | 135 | _current_bci = 0; |
aoqi@0 | 136 | _current_method_id = NULL; |
aoqi@0 | 137 | _breakpoint_posted = false; |
aoqi@0 | 138 | _single_stepping_posted = false; |
aoqi@0 | 139 | _agent_thread_local_storage_data = NULL; |
aoqi@0 | 140 | } |
aoqi@0 | 141 | |
aoqi@0 | 142 | JvmtiEnvThreadState::~JvmtiEnvThreadState() { |
aoqi@0 | 143 | delete _frame_pops; |
aoqi@0 | 144 | _frame_pops = NULL; |
aoqi@0 | 145 | } |
aoqi@0 | 146 | |
aoqi@0 | 147 | // Given that a new (potential) event has come in, |
aoqi@0 | 148 | // maintain the current JVMTI location on a per-thread per-env basis |
aoqi@0 | 149 | // and use it to filter out duplicate events: |
aoqi@0 | 150 | // - instruction rewrites |
aoqi@0 | 151 | // - breakpoint followed by single step |
aoqi@0 | 152 | // - single step at a breakpoint |
aoqi@0 | 153 | void JvmtiEnvThreadState::compare_and_set_current_location(Method* new_method, |
aoqi@0 | 154 | address new_location, jvmtiEvent event) { |
aoqi@0 | 155 | |
aoqi@0 | 156 | int new_bci = new_location - new_method->code_base(); |
aoqi@0 | 157 | |
aoqi@0 | 158 | // The method is identified and stored as a jmethodID which is safe in this |
aoqi@0 | 159 | // case because the class cannot be unloaded while a method is executing. |
aoqi@0 | 160 | jmethodID new_method_id = new_method->jmethod_id(); |
aoqi@0 | 161 | |
aoqi@0 | 162 | // the last breakpoint or single step was at this same location |
aoqi@0 | 163 | if (_current_bci == new_bci && _current_method_id == new_method_id) { |
aoqi@0 | 164 | switch (event) { |
aoqi@0 | 165 | case JVMTI_EVENT_BREAKPOINT: |
aoqi@0 | 166 | // Repeat breakpoint is complicated. If we previously posted a breakpoint |
aoqi@0 | 167 | // event at this location and if we also single stepped at this location |
aoqi@0 | 168 | // then we skip the duplicate breakpoint. |
aoqi@0 | 169 | _breakpoint_posted = _breakpoint_posted && _single_stepping_posted; |
aoqi@0 | 170 | break; |
aoqi@0 | 171 | case JVMTI_EVENT_SINGLE_STEP: |
aoqi@0 | 172 | // Repeat single step is easy: just don't post it again. |
aoqi@0 | 173 | // If step is pending for popframe then it may not be |
aoqi@0 | 174 | // a repeat step. The new_bci and method_id is same as current_bci |
aoqi@0 | 175 | // and current method_id after pop and step for recursive calls. |
aoqi@0 | 176 | // This has been handled by clearing the location |
aoqi@0 | 177 | _single_stepping_posted = true; |
aoqi@0 | 178 | break; |
aoqi@0 | 179 | default: |
aoqi@0 | 180 | assert(false, "invalid event value passed"); |
aoqi@0 | 181 | break; |
aoqi@0 | 182 | } |
aoqi@0 | 183 | return; |
aoqi@0 | 184 | } |
aoqi@0 | 185 | |
aoqi@0 | 186 | set_current_location(new_method_id, new_bci); |
aoqi@0 | 187 | _breakpoint_posted = false; |
aoqi@0 | 188 | _single_stepping_posted = false; |
aoqi@0 | 189 | } |
aoqi@0 | 190 | |
aoqi@0 | 191 | |
aoqi@0 | 192 | JvmtiFramePops* JvmtiEnvThreadState::get_frame_pops() { |
aoqi@0 | 193 | #ifdef ASSERT |
aoqi@0 | 194 | uint32_t debug_bits = 0; |
aoqi@0 | 195 | #endif |
aoqi@0 | 196 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
aoqi@0 | 197 | "frame pop data only accessible from same thread or while suspended"); |
aoqi@0 | 198 | |
aoqi@0 | 199 | if (_frame_pops == NULL) { |
aoqi@0 | 200 | _frame_pops = new JvmtiFramePops(); |
aoqi@0 | 201 | assert(_frame_pops != NULL, "_frame_pops != NULL"); |
aoqi@0 | 202 | } |
aoqi@0 | 203 | return _frame_pops; |
aoqi@0 | 204 | } |
aoqi@0 | 205 | |
aoqi@0 | 206 | |
aoqi@0 | 207 | bool JvmtiEnvThreadState::has_frame_pops() { |
aoqi@0 | 208 | return _frame_pops == NULL? false : (_frame_pops->length() > 0); |
aoqi@0 | 209 | } |
aoqi@0 | 210 | |
aoqi@0 | 211 | void JvmtiEnvThreadState::set_frame_pop(int frame_number) { |
aoqi@0 | 212 | #ifdef ASSERT |
aoqi@0 | 213 | uint32_t debug_bits = 0; |
aoqi@0 | 214 | #endif |
aoqi@0 | 215 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
aoqi@0 | 216 | "frame pop data only accessible from same thread or while suspended"); |
aoqi@0 | 217 | JvmtiFramePop fpop(frame_number); |
aoqi@0 | 218 | JvmtiEventController::set_frame_pop(this, fpop); |
aoqi@0 | 219 | } |
aoqi@0 | 220 | |
aoqi@0 | 221 | |
aoqi@0 | 222 | void JvmtiEnvThreadState::clear_frame_pop(int frame_number) { |
aoqi@0 | 223 | #ifdef ASSERT |
aoqi@0 | 224 | uint32_t debug_bits = 0; |
aoqi@0 | 225 | #endif |
aoqi@0 | 226 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
aoqi@0 | 227 | "frame pop data only accessible from same thread or while suspended"); |
aoqi@0 | 228 | JvmtiFramePop fpop(frame_number); |
aoqi@0 | 229 | JvmtiEventController::clear_frame_pop(this, fpop); |
aoqi@0 | 230 | } |
aoqi@0 | 231 | |
aoqi@0 | 232 | |
aoqi@0 | 233 | void JvmtiEnvThreadState::clear_to_frame_pop(int frame_number) { |
aoqi@0 | 234 | #ifdef ASSERT |
aoqi@0 | 235 | uint32_t debug_bits = 0; |
aoqi@0 | 236 | #endif |
aoqi@0 | 237 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
aoqi@0 | 238 | "frame pop data only accessible from same thread or while suspended"); |
aoqi@0 | 239 | JvmtiFramePop fpop(frame_number); |
aoqi@0 | 240 | JvmtiEventController::clear_to_frame_pop(this, fpop); |
aoqi@0 | 241 | } |
aoqi@0 | 242 | |
aoqi@0 | 243 | |
aoqi@0 | 244 | bool JvmtiEnvThreadState::is_frame_pop(int cur_frame_number) { |
aoqi@0 | 245 | #ifdef ASSERT |
aoqi@0 | 246 | uint32_t debug_bits = 0; |
aoqi@0 | 247 | #endif |
aoqi@0 | 248 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
aoqi@0 | 249 | "frame pop data only accessible from same thread or while suspended"); |
aoqi@0 | 250 | if (!get_thread()->is_interp_only_mode() || _frame_pops == NULL) { |
aoqi@0 | 251 | return false; |
aoqi@0 | 252 | } |
aoqi@0 | 253 | JvmtiFramePop fp(cur_frame_number); |
aoqi@0 | 254 | return get_frame_pops()->contains(fp); |
aoqi@0 | 255 | } |
aoqi@0 | 256 | |
aoqi@0 | 257 | |
aoqi@0 | 258 | class VM_GetCurrentLocation : public VM_Operation { |
aoqi@0 | 259 | private: |
aoqi@0 | 260 | JavaThread *_thread; |
aoqi@0 | 261 | jmethodID _method_id; |
aoqi@0 | 262 | int _bci; |
aoqi@0 | 263 | |
aoqi@0 | 264 | public: |
aoqi@0 | 265 | VM_GetCurrentLocation(JavaThread *thread) { |
aoqi@0 | 266 | _thread = thread; |
aoqi@0 | 267 | } |
aoqi@0 | 268 | VMOp_Type type() const { return VMOp_GetCurrentLocation; } |
aoqi@0 | 269 | void doit() { |
aoqi@0 | 270 | ResourceMark rmark; // _thread != Thread::current() |
aoqi@0 | 271 | RegisterMap rm(_thread, false); |
aoqi@0 | 272 | // There can be a race condition between a VM_Operation reaching a safepoint |
aoqi@0 | 273 | // and the target thread exiting from Java execution. |
aoqi@0 | 274 | // We must recheck the last Java frame still exists. |
aoqi@0 | 275 | if (!_thread->is_exiting() && _thread->has_last_Java_frame()) { |
aoqi@0 | 276 | javaVFrame* vf = _thread->last_java_vframe(&rm); |
aoqi@0 | 277 | assert(vf != NULL, "must have last java frame"); |
aoqi@0 | 278 | Method* method = vf->method(); |
aoqi@0 | 279 | _method_id = method->jmethod_id(); |
aoqi@0 | 280 | _bci = vf->bci(); |
aoqi@0 | 281 | } else { |
aoqi@0 | 282 | // Clear current location as the target thread has no Java frames anymore. |
aoqi@0 | 283 | _method_id = (jmethodID)NULL; |
aoqi@0 | 284 | _bci = 0; |
aoqi@0 | 285 | } |
aoqi@0 | 286 | } |
aoqi@0 | 287 | void get_current_location(jmethodID *method_id, int *bci) { |
aoqi@0 | 288 | *method_id = _method_id; |
aoqi@0 | 289 | *bci = _bci; |
aoqi@0 | 290 | } |
aoqi@0 | 291 | }; |
aoqi@0 | 292 | |
aoqi@0 | 293 | void JvmtiEnvThreadState::reset_current_location(jvmtiEvent event_type, bool enabled) { |
aoqi@0 | 294 | assert(event_type == JVMTI_EVENT_SINGLE_STEP || event_type == JVMTI_EVENT_BREAKPOINT, |
aoqi@0 | 295 | "must be single-step or breakpoint event"); |
aoqi@0 | 296 | |
aoqi@0 | 297 | // Current location is used to detect the following: |
aoqi@0 | 298 | // 1) a breakpoint event followed by single-stepping to the same bci |
aoqi@0 | 299 | // 2) single-step to a bytecode that will be transformed to a fast version |
aoqi@0 | 300 | // We skip to avoid posting the duplicate single-stepping event. |
aoqi@0 | 301 | |
aoqi@0 | 302 | // If single-stepping is disabled, clear current location so that |
aoqi@0 | 303 | // single-stepping to the same method and bcp at a later time will be |
aoqi@0 | 304 | // detected if single-stepping is enabled at that time (see 4388912). |
aoqi@0 | 305 | |
aoqi@0 | 306 | // If single-stepping is enabled, set the current location to the |
aoqi@0 | 307 | // current method and bcp. This covers the following type of case, |
aoqi@0 | 308 | // e.g., the debugger stepi command: |
aoqi@0 | 309 | // - bytecode single stepped |
aoqi@0 | 310 | // - SINGLE_STEP event posted and SINGLE_STEP event disabled |
aoqi@0 | 311 | // - SINGLE_STEP event reenabled |
aoqi@0 | 312 | // - bytecode rewritten to fast version |
aoqi@0 | 313 | |
aoqi@0 | 314 | // If breakpoint event is disabled, clear current location only if |
aoqi@0 | 315 | // single-stepping is not enabled. Otherwise, keep the thread location |
aoqi@0 | 316 | // to detect any duplicate events. |
aoqi@0 | 317 | |
aoqi@0 | 318 | if (enabled) { |
aoqi@0 | 319 | // If enabling breakpoint, no need to reset. |
aoqi@0 | 320 | // Can't do anything if empty stack. |
aoqi@0 | 321 | if (event_type == JVMTI_EVENT_SINGLE_STEP && _thread->has_last_Java_frame()) { |
aoqi@0 | 322 | jmethodID method_id; |
aoqi@0 | 323 | int bci; |
aoqi@0 | 324 | // The java thread stack may not be walkable for a running thread |
aoqi@0 | 325 | // so get current location at safepoint. |
aoqi@0 | 326 | VM_GetCurrentLocation op(_thread); |
aoqi@0 | 327 | VMThread::execute(&op); |
aoqi@0 | 328 | op.get_current_location(&method_id, &bci); |
aoqi@0 | 329 | set_current_location(method_id, bci); |
aoqi@0 | 330 | } |
aoqi@0 | 331 | } else if (event_type == JVMTI_EVENT_SINGLE_STEP || !is_enabled(JVMTI_EVENT_SINGLE_STEP)) { |
aoqi@0 | 332 | // If this is to disable breakpoint, also check if single-step is not enabled |
aoqi@0 | 333 | clear_current_location(); |
aoqi@0 | 334 | } |
aoqi@0 | 335 | } |