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src/hotspot/share/prims/jvmtiEnvThreadState.cpp

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rev 54066 : 8261262: Kitchensink24HStress.java crashed with EXCEPTION_ACCESS_VIOLATION
Reviewed-by: dcubed, sspitsyn
   1 /*
   2  * Copyright (c) 2003, 2017, 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  *


 239   return get_frame_pops()->contains(fp);
 240 }
 241 
 242 
 243 class VM_GetCurrentLocation : public VM_Operation {
 244  private:
 245    JavaThread *_thread;
 246    jmethodID _method_id;
 247    int _bci;
 248 
 249  public:
 250   VM_GetCurrentLocation(JavaThread *thread) {
 251      _thread = thread;
 252    }
 253   VMOp_Type type() const { return VMOp_GetCurrentLocation; }
 254   void doit() {
 255     ResourceMark rmark; // _thread != Thread::current()
 256     RegisterMap rm(_thread, false);
 257     // There can be a race condition between a VM_Operation reaching a safepoint
 258     // and the target thread exiting from Java execution.
 259     // We must recheck the last Java frame still exists.
 260     if (!_thread->is_exiting() && _thread->has_last_Java_frame()) {
 261       javaVFrame* vf = _thread->last_java_vframe(&rm);
 262       assert(vf != NULL, "must have last java frame");
 263       Method* method = vf->method();
 264       _method_id = method->jmethod_id();
 265       _bci = vf->bci();
 266     } else {
 267       // Clear current location as the target thread has no Java frames anymore.
 268       _method_id = (jmethodID)NULL;
 269       _bci = 0;
 270     }
 271   }
 272   void get_current_location(jmethodID *method_id, int *bci) {
 273     *method_id = _method_id;
 274     *bci = _bci;
 275   }
 276 };
 277 
 278 void JvmtiEnvThreadState::reset_current_location(jvmtiEvent event_type, bool enabled) {
 279   assert(event_type == JVMTI_EVENT_SINGLE_STEP || event_type == JVMTI_EVENT_BREAKPOINT,
 280          "must be single-step or breakpoint event");
 281 
 282   // Current location is used to detect the following:
 283   // 1) a breakpoint event followed by single-stepping to the same bci
 284   // 2) single-step to a bytecode that will be transformed to a fast version
 285   // We skip to avoid posting the duplicate single-stepping event.
 286 
 287   // If single-stepping is disabled, clear current location so that
 288   // single-stepping to the same method and bcp at a later time will be
 289   // detected if single-stepping is enabled at that time (see 4388912).


   1 /*
   2  * Copyright (c) 2003, 2021, 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  *


 239   return get_frame_pops()->contains(fp);
 240 }
 241 
 242 
 243 class VM_GetCurrentLocation : public VM_Operation {
 244  private:
 245    JavaThread *_thread;
 246    jmethodID _method_id;
 247    int _bci;
 248 
 249  public:
 250   VM_GetCurrentLocation(JavaThread *thread) {
 251      _thread = thread;
 252    }
 253   VMOp_Type type() const { return VMOp_GetCurrentLocation; }
 254   void doit() {
 255     ResourceMark rmark; // _thread != Thread::current()
 256     RegisterMap rm(_thread, false);
 257     // There can be a race condition between a VM_Operation reaching a safepoint
 258     // and the target thread exiting from Java execution.
 259     // We must recheck that the last Java frame still exists.
 260     if (!_thread->is_exiting() && _thread->has_last_Java_frame()) {
 261       javaVFrame* vf = _thread->last_java_vframe(&rm);
 262       if (vf != NULL) {
 263         Method* method = vf->method();
 264         _method_id = method->jmethod_id();
 265         _bci = vf->bci();
 266       }



 267     }
 268   }
 269   void get_current_location(jmethodID *method_id, int *bci) {
 270     *method_id = _method_id;
 271     *bci = _bci;
 272   }
 273 };
 274 
 275 void JvmtiEnvThreadState::reset_current_location(jvmtiEvent event_type, bool enabled) {
 276   assert(event_type == JVMTI_EVENT_SINGLE_STEP || event_type == JVMTI_EVENT_BREAKPOINT,
 277          "must be single-step or breakpoint event");
 278 
 279   // Current location is used to detect the following:
 280   // 1) a breakpoint event followed by single-stepping to the same bci
 281   // 2) single-step to a bytecode that will be transformed to a fast version
 282   // We skip to avoid posting the duplicate single-stepping event.
 283 
 284   // If single-stepping is disabled, clear current location so that
 285   // single-stepping to the same method and bcp at a later time will be
 286   // detected if single-stepping is enabled at that time (see 4388912).


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