jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiThreadState.cpp@f90c822e73f8 (annotated)

src/share/vm/prims/jvmtiThreadState.cpp@f90c822e73f8 (annotated)

src/share/vm/prims/jvmtiThreadState.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "jvmtifiles/jvmtiEnv.hpp"
 #include "memory/gcLocker.hpp"
 #include "memory/resourceArea.hpp"
 #include "prims/jvmtiEventController.inline.hpp"
 #include "prims/jvmtiImpl.hpp"
 #include "prims/jvmtiThreadState.inline.hpp"
 #include "runtime/vframe.hpp"
 // marker for when the stack depth has been reset and is now unknown.
 // any negative number would work but small ones might obscure an
 // underrun error.
 static const int UNKNOWN_STACK_DEPTH = -99;
 ///////////////////////////////////////////////////////////////
 //
 // class JvmtiThreadState
 //
 // Instances of JvmtiThreadState hang off of each thread.
 // Thread local storage for JVMTI.
 //
 JvmtiThreadState *JvmtiThreadState::_head = NULL;
 JvmtiThreadState::JvmtiThreadState(JavaThread* thread)
   : _thread_event_enable() {
   assert(JvmtiThreadState_lock->is_locked(), "sanity check");
   _thread               = thread;
   _exception_detected   = false;
   _exception_caught     = false;
   _debuggable           = true;
   _hide_single_stepping = false;
   _hide_level           = 0;
   _pending_step_for_popframe = false;
   _class_being_redefined = NULL;
   _class_load_kind = jvmti_class_load_kind_load;
   _head_env_thread_state = NULL;
   _dynamic_code_event_collector = NULL;
   _vm_object_alloc_event_collector = NULL;
   _the_class_for_redefinition_verification = NULL;
   _scratch_class_for_redefinition_verification = NULL;
   // JVMTI ForceEarlyReturn support
   _pending_step_for_earlyret = false;
   _earlyret_state = earlyret_inactive;
   _earlyret_tos = ilgl;
   _earlyret_value.j = 0L;
   _earlyret_oop = NULL;
   // add all the JvmtiEnvThreadState to the new JvmtiThreadState
   {
     JvmtiEnvIterator it;
     for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
       if (env->is_valid()) {
         add_env(env);
       }
     }
   }
   // link us into the list
   {
     // The thread state list manipulation code must not have safepoints.
     // See periodic_clean_up().
     debug_only(No_Safepoint_Verifier nosafepoint;)
     _prev = NULL;
     _next = _head;
     if (_head != NULL) {
       _head->_prev = this;
     }
     _head = this;
   }
   // set this as the state for the thread
   thread->set_jvmti_thread_state(this);
 }
 JvmtiThreadState::~JvmtiThreadState()   {
   assert(JvmtiThreadState_lock->is_locked(), "sanity check");
   // clear this as the state for the thread
   get_thread()->set_jvmti_thread_state(NULL);
   // zap our env thread states
   {
     JvmtiEnvBase::entering_dying_thread_env_iteration();
     JvmtiEnvThreadStateIterator it(this);
     for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ) {
       JvmtiEnvThreadState* zap = ets;
       ets = it.next(ets);
       delete zap;
     }
     JvmtiEnvBase::leaving_dying_thread_env_iteration();
   }
   // remove us from the list
   {
     // The thread state list manipulation code must not have safepoints.
     // See periodic_clean_up().
     debug_only(No_Safepoint_Verifier nosafepoint;)
     if (_prev == NULL) {
       assert(_head == this, "sanity check");
       _head = _next;
     } else {
       assert(_head != this, "sanity check");
       _prev->_next = _next;
     }
     if (_next != NULL) {
       _next->_prev = _prev;
     }
     _next = NULL;
     _prev = NULL;
   }
 }
 void
 JvmtiThreadState::periodic_clean_up() {
   assert(SafepointSynchronize::is_at_safepoint(), "at safepoint");
   // This iteration is initialized with "_head" instead of "JvmtiThreadState::first()"
   // because the latter requires the JvmtiThreadState_lock.
   // This iteration is safe at a safepoint as well, see the No_Safepoint_Verifier
   // asserts at all list manipulation sites.
   for (JvmtiThreadState *state = _head; state != NULL; state = state->next()) {
     // For each environment thread state corresponding to an invalid environment
     // unlink it from the list and deallocate it.
     JvmtiEnvThreadStateIterator it(state);
     JvmtiEnvThreadState* previous_ets = NULL;
     JvmtiEnvThreadState* ets = it.first();
     while (ets != NULL) {
       if (ets->get_env()->is_valid()) {
         previous_ets = ets;
         ets = it.next(ets);
       } else {
         // This one isn't valid, remove it from the list and deallocate it
         JvmtiEnvThreadState* defunct_ets = ets;
         ets = ets->next();
         if (previous_ets == NULL) {
           assert(state->head_env_thread_state() == defunct_ets, "sanity check");
           state->set_head_env_thread_state(ets);
         } else {
           previous_ets->set_next(ets);
         }
         delete defunct_ets;
       }
     }
   }
 }
 void JvmtiThreadState::add_env(JvmtiEnvBase *env) {
   assert(JvmtiThreadState_lock->is_locked(), "sanity check");
   JvmtiEnvThreadState *new_ets = new JvmtiEnvThreadState(_thread, env);
   // add this environment thread state to the end of the list (order is important)
   {
     // list deallocation (which occurs at a safepoint) cannot occur simultaneously
     debug_only(No_Safepoint_Verifier nosafepoint;)
     JvmtiEnvThreadStateIterator it(this);
     JvmtiEnvThreadState* previous_ets = NULL;
     for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
       previous_ets = ets;
     }
     if (previous_ets == NULL) {
       set_head_env_thread_state(new_ets);
     } else {
       previous_ets->set_next(new_ets);
     }
   }
 }
 void JvmtiThreadState::enter_interp_only_mode() {
   assert(_thread->get_interp_only_mode() == 0, "entering interp only when mode not zero");
   _thread->increment_interp_only_mode();
 }
 void JvmtiThreadState::leave_interp_only_mode() {
   assert(_thread->get_interp_only_mode() == 1, "leaving interp only when mode not one");
   _thread->decrement_interp_only_mode();
 }
 // Helper routine used in several places
 int JvmtiThreadState::count_frames() {
 #ifdef ASSERT
   uint32_t debug_bits = 0;
 #endif
   assert(SafepointSynchronize::is_at_safepoint() ||
          JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits),
          "at safepoint or must be suspended");
   if (!get_thread()->has_last_Java_frame()) return 0;  // no Java frames
   ResourceMark rm;
   RegisterMap reg_map(get_thread());
   javaVFrame *jvf = get_thread()->last_java_vframe(&reg_map);
   int n = 0;
   // tty->print_cr("CSD: counting frames on %s ...",
   //               JvmtiTrace::safe_get_thread_name(get_thread()));
   while (jvf != NULL) {
     Method* method = jvf->method();
     // tty->print_cr("CSD: frame - method %s.%s - loc %d",
     //               method->klass_name()->as_C_string(),
     //               method->name()->as_C_string(),
     //               jvf->bci() );
     jvf = jvf->java_sender();
     n++;
   }
   // tty->print_cr("CSD: frame count: %d", n);
   return n;
 }
 void JvmtiThreadState::invalidate_cur_stack_depth() {
   Thread *cur = Thread::current();
   uint32_t debug_bits = 0;
   // The caller can be the VMThread at a safepoint, the current thread
   // or the target thread must be suspended.
   guarantee((cur->is_VM_thread() && SafepointSynchronize::is_at_safepoint()) ||
     (JavaThread *)cur == get_thread() ||
     JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits),
     "sanity check");
   _cur_stack_depth = UNKNOWN_STACK_DEPTH;
 }
 void JvmtiThreadState::incr_cur_stack_depth() {
   guarantee(JavaThread::current() == get_thread(), "must be current thread");
   if (!is_interp_only_mode()) {
     _cur_stack_depth = UNKNOWN_STACK_DEPTH;
   }
   if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) {
     ++_cur_stack_depth;
   }
 }
 void JvmtiThreadState::decr_cur_stack_depth() {
   guarantee(JavaThread::current() == get_thread(), "must be current thread");
   if (!is_interp_only_mode()) {
     _cur_stack_depth = UNKNOWN_STACK_DEPTH;
   }
   if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) {
     --_cur_stack_depth;
     assert(_cur_stack_depth >= 0, "incr/decr_cur_stack_depth mismatch");
   }
 }
 int JvmtiThreadState::cur_stack_depth() {
   uint32_t debug_bits = 0;
   guarantee(JavaThread::current() == get_thread() ||
     JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits),
     "must be current thread or suspended");
   if (!is_interp_only_mode() || _cur_stack_depth == UNKNOWN_STACK_DEPTH) {
     _cur_stack_depth = count_frames();
   } else {
     // heavy weight assert
     assert(_cur_stack_depth == count_frames(),
            "cur_stack_depth out of sync");
   }
   return _cur_stack_depth;
 }
 bool JvmtiThreadState::may_be_walked() {
   return (get_thread()->is_being_ext_suspended() || (JavaThread::current() == get_thread()));
 }
 void JvmtiThreadState::process_pending_step_for_popframe() {
   // We are single stepping as the last part of the PopFrame() dance
   // so we have some house keeping to do.
   JavaThread *thr = get_thread();
   if (thr->popframe_condition() != JavaThread::popframe_inactive) {
     // If the popframe_condition field is not popframe_inactive, then
     // we missed all of the popframe_field cleanup points:
     //
     // - unpack_frames() was not called (nothing to deopt)
     // - remove_activation_preserving_args_entry() was not called
     //   (did not get suspended in a call_vm() family call and did
     //   not complete a call_vm() family call on the way here)
     thr->clear_popframe_condition();
   }
   // clearing the flag indicates we are done with the PopFrame() dance
   clr_pending_step_for_popframe();
   // If exception was thrown in this frame, need to reset jvmti thread state.
   // Single stepping may not get enabled correctly by the agent since
   // exception state is passed in MethodExit event which may be sent at some
   // time in the future. JDWP agent ignores MethodExit events if caused by
   // an exception.
   //
   if (is_exception_detected()) {
     clear_exception_detected();
   }
   // If step is pending for popframe then it may not be
   // a repeat step. The new_bci and method_id is same as current_bci
   // and current method_id after pop and step for recursive calls.
   // Force the step by clearing the last location.
   JvmtiEnvThreadStateIterator it(this);
   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
     ets->clear_current_location();
   }
 }
 // Class:     JvmtiThreadState
 // Function:  update_for_pop_top_frame
 // Description:
 //   This function removes any frame pop notification request for
 //   the top frame and invalidates both the current stack depth and
 //   all cached frameIDs.
 //
 // Called by: PopFrame
 //
 void JvmtiThreadState::update_for_pop_top_frame() {
   if (is_interp_only_mode()) {
     // remove any frame pop notification request for the top frame
     // in any environment
     int popframe_number = cur_stack_depth();
     {
       JvmtiEnvThreadStateIterator it(this);
       for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
         if (ets->is_frame_pop(popframe_number)) {
           ets->clear_frame_pop(popframe_number);
         }
       }
     }
     // force stack depth to be recalculated
     invalidate_cur_stack_depth();
   } else {
     assert(!is_enabled(JVMTI_EVENT_FRAME_POP), "Must have no framepops set");
   }
 }
 void JvmtiThreadState::process_pending_step_for_earlyret() {
   // We are single stepping as the last part of the ForceEarlyReturn
   // dance so we have some house keeping to do.
   if (is_earlyret_pending()) {
     // If the earlyret_state field is not earlyret_inactive, then
     // we missed all of the earlyret_field cleanup points:
     //
     // - remove_activation() was not called
     //   (did not get suspended in a call_vm() family call and did
     //   not complete a call_vm() family call on the way here)
     //
     // One legitimate way for us to miss all the cleanup points is
     // if we got here right after handling a compiled return. If that
     // is the case, then we consider our return from compiled code to
     // complete the ForceEarlyReturn request and we clear the condition.
     clr_earlyret_pending();
     set_earlyret_oop(NULL);
     clr_earlyret_value();
   }
   // clearing the flag indicates we are done with
   // the ForceEarlyReturn() dance
   clr_pending_step_for_earlyret();
   // If exception was thrown in this frame, need to reset jvmti thread state.
   // Single stepping may not get enabled correctly by the agent since
   // exception state is passed in MethodExit event which may be sent at some
   // time in the future. JDWP agent ignores MethodExit events if caused by
   // an exception.
   //
   if (is_exception_detected()) {
     clear_exception_detected();
   }
   // If step is pending for earlyret then it may not be a repeat step.
   // The new_bci and method_id is same as current_bci and current
   // method_id after earlyret and step for recursive calls.
   // Force the step by clearing the last location.
   JvmtiEnvThreadStateIterator it(this);
   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
     ets->clear_current_location();
   }
 }
 void JvmtiThreadState::oops_do(OopClosure* f) {
   f->do_oop((oop*) &_earlyret_oop);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/jvmtiThreadState.cpp@f90c822e73f8 (annotated)

src/share/vm/prims/jvmtiThreadState.cpp