Wed, 09 Apr 2008 15:10:22 -0700
Merge
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_jvmtiEnvThreadState.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | |
duke@435 | 29 | /////////////////////////////////////////////////////////////// |
duke@435 | 30 | // |
duke@435 | 31 | // class JvmtiFramePop |
duke@435 | 32 | // |
duke@435 | 33 | |
duke@435 | 34 | #ifndef PRODUCT |
duke@435 | 35 | void JvmtiFramePop::print() { |
duke@435 | 36 | tty->print_cr("_frame_number=%d", _frame_number); |
duke@435 | 37 | } |
duke@435 | 38 | #endif |
duke@435 | 39 | |
duke@435 | 40 | |
duke@435 | 41 | /////////////////////////////////////////////////////////////// |
duke@435 | 42 | // |
duke@435 | 43 | // class JvmtiFramePops - private methods |
duke@435 | 44 | // |
duke@435 | 45 | |
duke@435 | 46 | void |
duke@435 | 47 | JvmtiFramePops::set(JvmtiFramePop& fp) { |
duke@435 | 48 | if (_pops->find(fp.frame_number()) < 0) { |
duke@435 | 49 | _pops->append(fp.frame_number()); |
duke@435 | 50 | } |
duke@435 | 51 | } |
duke@435 | 52 | |
duke@435 | 53 | |
duke@435 | 54 | void |
duke@435 | 55 | JvmtiFramePops::clear(JvmtiFramePop& fp) { |
duke@435 | 56 | assert(_pops->length() > 0, "No more frame pops"); |
duke@435 | 57 | |
duke@435 | 58 | _pops->remove(fp.frame_number()); |
duke@435 | 59 | } |
duke@435 | 60 | |
duke@435 | 61 | |
duke@435 | 62 | int |
duke@435 | 63 | JvmtiFramePops::clear_to(JvmtiFramePop& fp) { |
duke@435 | 64 | int cleared = 0; |
duke@435 | 65 | int index = 0; |
duke@435 | 66 | while (index < _pops->length()) { |
duke@435 | 67 | JvmtiFramePop pop = JvmtiFramePop(_pops->at(index)); |
duke@435 | 68 | if (pop.above_on_stack(fp)) { |
duke@435 | 69 | _pops->remove_at(index); |
duke@435 | 70 | ++cleared; |
duke@435 | 71 | } else { |
duke@435 | 72 | ++index; |
duke@435 | 73 | } |
duke@435 | 74 | } |
duke@435 | 75 | return cleared; |
duke@435 | 76 | } |
duke@435 | 77 | |
duke@435 | 78 | |
duke@435 | 79 | /////////////////////////////////////////////////////////////// |
duke@435 | 80 | // |
duke@435 | 81 | // class JvmtiFramePops - public methods |
duke@435 | 82 | // |
duke@435 | 83 | |
duke@435 | 84 | JvmtiFramePops::JvmtiFramePops() { |
duke@435 | 85 | _pops = new (ResourceObj::C_HEAP) GrowableArray<int> (2, true); |
duke@435 | 86 | } |
duke@435 | 87 | |
duke@435 | 88 | JvmtiFramePops::~JvmtiFramePops() { |
duke@435 | 89 | // return memory to c_heap. |
duke@435 | 90 | delete _pops; |
duke@435 | 91 | } |
duke@435 | 92 | |
duke@435 | 93 | |
duke@435 | 94 | #ifndef PRODUCT |
duke@435 | 95 | void JvmtiFramePops::print() { |
duke@435 | 96 | ResourceMark rm; |
duke@435 | 97 | |
duke@435 | 98 | int n = _pops->length(); |
duke@435 | 99 | for (int i=0; i<n; i++) { |
duke@435 | 100 | JvmtiFramePop fp = JvmtiFramePop(_pops->at(i)); |
duke@435 | 101 | tty->print("%d: ", i); |
duke@435 | 102 | fp.print(); |
duke@435 | 103 | tty->print_cr(""); |
duke@435 | 104 | } |
duke@435 | 105 | } |
duke@435 | 106 | #endif |
duke@435 | 107 | |
duke@435 | 108 | /////////////////////////////////////////////////////////////// |
duke@435 | 109 | // |
duke@435 | 110 | // class JvmtiEnvThreadState |
duke@435 | 111 | // |
duke@435 | 112 | // Instances of JvmtiEnvThreadState hang off of each JvmtiThreadState, |
duke@435 | 113 | // one per JvmtiEnv. |
duke@435 | 114 | // |
duke@435 | 115 | |
duke@435 | 116 | JvmtiEnvThreadState::JvmtiEnvThreadState(JavaThread *thread, JvmtiEnvBase *env) : |
duke@435 | 117 | _event_enable() { |
duke@435 | 118 | _thread = thread; |
duke@435 | 119 | _env = (JvmtiEnv*)env; |
duke@435 | 120 | _next = NULL; |
duke@435 | 121 | _frame_pops = NULL; |
duke@435 | 122 | _current_bci = 0; |
duke@435 | 123 | _current_method_id = NULL; |
duke@435 | 124 | _breakpoint_posted = false; |
duke@435 | 125 | _single_stepping_posted = false; |
duke@435 | 126 | _agent_thread_local_storage_data = NULL; |
duke@435 | 127 | } |
duke@435 | 128 | |
duke@435 | 129 | JvmtiEnvThreadState::~JvmtiEnvThreadState() { |
duke@435 | 130 | delete _frame_pops; |
duke@435 | 131 | _frame_pops = NULL; |
duke@435 | 132 | } |
duke@435 | 133 | |
duke@435 | 134 | // Given that a new (potential) event has come in, |
duke@435 | 135 | // maintain the current JVMTI location on a per-thread per-env basis |
duke@435 | 136 | // and use it to filter out duplicate events: |
duke@435 | 137 | // - instruction rewrites |
duke@435 | 138 | // - breakpoint followed by single step |
duke@435 | 139 | // - single step at a breakpoint |
duke@435 | 140 | void JvmtiEnvThreadState::compare_and_set_current_location(methodOop new_method, |
duke@435 | 141 | address new_location, jvmtiEvent event) { |
duke@435 | 142 | |
duke@435 | 143 | int new_bci = new_location - new_method->code_base(); |
duke@435 | 144 | |
duke@435 | 145 | // The method is identified and stored as a jmethodID which is safe in this |
duke@435 | 146 | // case because the class cannot be unloaded while a method is executing. |
duke@435 | 147 | jmethodID new_method_id = new_method->jmethod_id(); |
duke@435 | 148 | |
duke@435 | 149 | // the last breakpoint or single step was at this same location |
duke@435 | 150 | if (_current_bci == new_bci && _current_method_id == new_method_id) { |
duke@435 | 151 | switch (event) { |
duke@435 | 152 | case JVMTI_EVENT_BREAKPOINT: |
duke@435 | 153 | // Repeat breakpoint is complicated. If we previously posted a breakpoint |
duke@435 | 154 | // event at this location and if we also single stepped at this location |
duke@435 | 155 | // then we skip the duplicate breakpoint. |
duke@435 | 156 | _breakpoint_posted = _breakpoint_posted && _single_stepping_posted; |
duke@435 | 157 | break; |
duke@435 | 158 | case JVMTI_EVENT_SINGLE_STEP: |
duke@435 | 159 | // Repeat single step is easy: just don't post it again. |
duke@435 | 160 | // If step is pending for popframe then it may not be |
duke@435 | 161 | // a repeat step. The new_bci and method_id is same as current_bci |
duke@435 | 162 | // and current method_id after pop and step for recursive calls. |
duke@435 | 163 | // This has been handled by clearing the location |
duke@435 | 164 | _single_stepping_posted = true; |
duke@435 | 165 | break; |
duke@435 | 166 | default: |
duke@435 | 167 | assert(false, "invalid event value passed"); |
duke@435 | 168 | break; |
duke@435 | 169 | } |
duke@435 | 170 | return; |
duke@435 | 171 | } |
duke@435 | 172 | |
duke@435 | 173 | set_current_location(new_method_id, new_bci); |
duke@435 | 174 | _breakpoint_posted = false; |
duke@435 | 175 | _single_stepping_posted = false; |
duke@435 | 176 | } |
duke@435 | 177 | |
duke@435 | 178 | |
duke@435 | 179 | JvmtiFramePops* JvmtiEnvThreadState::get_frame_pops() { |
duke@435 | 180 | #ifdef ASSERT |
duke@435 | 181 | uint32_t debug_bits = 0; |
duke@435 | 182 | #endif |
duke@435 | 183 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
duke@435 | 184 | "frame pop data only accessible from same thread or while suspended"); |
duke@435 | 185 | |
duke@435 | 186 | if (_frame_pops == NULL) { |
duke@435 | 187 | _frame_pops = new JvmtiFramePops(); |
duke@435 | 188 | assert(_frame_pops != NULL, "_frame_pops != NULL"); |
duke@435 | 189 | } |
duke@435 | 190 | return _frame_pops; |
duke@435 | 191 | } |
duke@435 | 192 | |
duke@435 | 193 | |
duke@435 | 194 | bool JvmtiEnvThreadState::has_frame_pops() { |
duke@435 | 195 | return _frame_pops == NULL? false : (_frame_pops->length() > 0); |
duke@435 | 196 | } |
duke@435 | 197 | |
duke@435 | 198 | void JvmtiEnvThreadState::set_frame_pop(int frame_number) { |
duke@435 | 199 | #ifdef ASSERT |
duke@435 | 200 | uint32_t debug_bits = 0; |
duke@435 | 201 | #endif |
duke@435 | 202 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
duke@435 | 203 | "frame pop data only accessible from same thread or while suspended"); |
duke@435 | 204 | JvmtiFramePop fpop(frame_number); |
duke@435 | 205 | JvmtiEventController::set_frame_pop(this, fpop); |
duke@435 | 206 | } |
duke@435 | 207 | |
duke@435 | 208 | |
duke@435 | 209 | void JvmtiEnvThreadState::clear_frame_pop(int frame_number) { |
duke@435 | 210 | #ifdef ASSERT |
duke@435 | 211 | uint32_t debug_bits = 0; |
duke@435 | 212 | #endif |
duke@435 | 213 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
duke@435 | 214 | "frame pop data only accessible from same thread or while suspended"); |
duke@435 | 215 | JvmtiFramePop fpop(frame_number); |
duke@435 | 216 | JvmtiEventController::clear_frame_pop(this, fpop); |
duke@435 | 217 | } |
duke@435 | 218 | |
duke@435 | 219 | |
duke@435 | 220 | void JvmtiEnvThreadState::clear_to_frame_pop(int frame_number) { |
duke@435 | 221 | #ifdef ASSERT |
duke@435 | 222 | uint32_t debug_bits = 0; |
duke@435 | 223 | #endif |
duke@435 | 224 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
duke@435 | 225 | "frame pop data only accessible from same thread or while suspended"); |
duke@435 | 226 | JvmtiFramePop fpop(frame_number); |
duke@435 | 227 | JvmtiEventController::clear_to_frame_pop(this, fpop); |
duke@435 | 228 | } |
duke@435 | 229 | |
duke@435 | 230 | |
duke@435 | 231 | bool JvmtiEnvThreadState::is_frame_pop(int cur_frame_number) { |
duke@435 | 232 | #ifdef ASSERT |
duke@435 | 233 | uint32_t debug_bits = 0; |
duke@435 | 234 | #endif |
duke@435 | 235 | assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
duke@435 | 236 | "frame pop data only accessible from same thread or while suspended"); |
duke@435 | 237 | if (!get_thread()->is_interp_only_mode() || _frame_pops == NULL) { |
duke@435 | 238 | return false; |
duke@435 | 239 | } |
duke@435 | 240 | JvmtiFramePop fp(cur_frame_number); |
duke@435 | 241 | return get_frame_pops()->contains(fp); |
duke@435 | 242 | } |
duke@435 | 243 | |
duke@435 | 244 | |
duke@435 | 245 | class VM_GetCurrentLocation : public VM_Operation { |
duke@435 | 246 | private: |
duke@435 | 247 | JavaThread *_thread; |
duke@435 | 248 | jmethodID _method_id; |
duke@435 | 249 | int _bci; |
duke@435 | 250 | |
duke@435 | 251 | public: |
duke@435 | 252 | VM_GetCurrentLocation(JavaThread *thread) { |
duke@435 | 253 | _thread = thread; |
duke@435 | 254 | } |
duke@435 | 255 | VMOp_Type type() const { return VMOp_GetCurrentLocation; } |
duke@435 | 256 | void doit() { |
duke@435 | 257 | ResourceMark rmark; // _thread != Thread::current() |
duke@435 | 258 | RegisterMap rm(_thread, false); |
duke@435 | 259 | javaVFrame* vf = _thread->last_java_vframe(&rm); |
duke@435 | 260 | assert(vf != NULL, "must have last java frame"); |
duke@435 | 261 | methodOop method = vf->method(); |
duke@435 | 262 | _method_id = method->jmethod_id(); |
duke@435 | 263 | _bci = vf->bci(); |
duke@435 | 264 | } |
duke@435 | 265 | void get_current_location(jmethodID *method_id, int *bci) { |
duke@435 | 266 | *method_id = _method_id; |
duke@435 | 267 | *bci = _bci; |
duke@435 | 268 | } |
duke@435 | 269 | }; |
duke@435 | 270 | |
duke@435 | 271 | void JvmtiEnvThreadState::reset_current_location(jvmtiEvent event_type, bool enabled) { |
duke@435 | 272 | assert(event_type == JVMTI_EVENT_SINGLE_STEP || event_type == JVMTI_EVENT_BREAKPOINT, |
duke@435 | 273 | "must be single-step or breakpoint event"); |
duke@435 | 274 | |
duke@435 | 275 | // Current location is used to detect the following: |
duke@435 | 276 | // 1) a breakpoint event followed by single-stepping to the same bci |
duke@435 | 277 | // 2) single-step to a bytecode that will be transformed to a fast version |
duke@435 | 278 | // We skip to avoid posting the duplicate single-stepping event. |
duke@435 | 279 | |
duke@435 | 280 | // If single-stepping is disabled, clear current location so that |
duke@435 | 281 | // single-stepping to the same method and bcp at a later time will be |
duke@435 | 282 | // detected if single-stepping is enabled at that time (see 4388912). |
duke@435 | 283 | |
duke@435 | 284 | // If single-stepping is enabled, set the current location to the |
duke@435 | 285 | // current method and bcp. This covers the following type of case, |
duke@435 | 286 | // e.g., the debugger stepi command: |
duke@435 | 287 | // - bytecode single stepped |
duke@435 | 288 | // - SINGLE_STEP event posted and SINGLE_STEP event disabled |
duke@435 | 289 | // - SINGLE_STEP event reenabled |
duke@435 | 290 | // - bytecode rewritten to fast version |
duke@435 | 291 | |
duke@435 | 292 | // If breakpoint event is disabled, clear current location only if |
duke@435 | 293 | // single-stepping is not enabled. Otherwise, keep the thread location |
duke@435 | 294 | // to detect any duplicate events. |
duke@435 | 295 | |
duke@435 | 296 | if (enabled) { |
duke@435 | 297 | // If enabling breakpoint, no need to reset. |
duke@435 | 298 | // Can't do anything if empty stack. |
duke@435 | 299 | if (event_type == JVMTI_EVENT_SINGLE_STEP && _thread->has_last_Java_frame()) { |
duke@435 | 300 | jmethodID method_id; |
duke@435 | 301 | int bci; |
duke@435 | 302 | // The java thread stack may not be walkable for a running thread |
duke@435 | 303 | // so get current location at safepoint. |
duke@435 | 304 | VM_GetCurrentLocation op(_thread); |
duke@435 | 305 | VMThread::execute(&op); |
duke@435 | 306 | op.get_current_location(&method_id, &bci); |
duke@435 | 307 | set_current_location(method_id, bci); |
duke@435 | 308 | } |
duke@435 | 309 | } else if (event_type == JVMTI_EVENT_SINGLE_STEP || !is_enabled(JVMTI_EVENT_SINGLE_STEP)) { |
duke@435 | 310 | // If this is to disable breakpoint, also check if single-step is not enabled |
duke@435 | 311 | clear_current_location(); |
duke@435 | 312 | } |
duke@435 | 313 | } |