author | jcbeyler |
Fri, 15 Jun 2018 00:49:54 -0700 | |
changeset 50578 | e2a7f431f65c |
parent 49594 | 898ef81cbc0e |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "jvmtifiles/jvmtiEnv.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "prims/jvmtiEventController.inline.hpp" |
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#include "prims/jvmtiImpl.hpp" |
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#include "prims/jvmtiThreadState.inline.hpp" |
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#include "runtime/safepointVerifiers.hpp" |
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#include "runtime/vframe.hpp" |
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// marker for when the stack depth has been reset and is now unknown. |
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// any negative number would work but small ones might obscure an |
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// underrun error. |
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static const int UNKNOWN_STACK_DEPTH = -99; |
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||
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/////////////////////////////////////////////////////////////// |
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// |
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// class JvmtiThreadState |
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// |
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// Instances of JvmtiThreadState hang off of each thread. |
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// Thread local storage for JVMTI. |
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// |
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JvmtiThreadState *JvmtiThreadState::_head = NULL; |
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||
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JvmtiThreadState::JvmtiThreadState(JavaThread* thread) |
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: _thread_event_enable() { |
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assert(JvmtiThreadState_lock->is_locked(), "sanity check"); |
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_thread = thread; |
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_exception_state = ES_CLEARED; |
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_debuggable = true; |
55 |
_hide_single_stepping = false; |
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_hide_level = 0; |
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_pending_step_for_popframe = false; |
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_class_being_redefined = NULL; |
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_class_load_kind = jvmti_class_load_kind_load; |
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_head_env_thread_state = NULL; |
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_dynamic_code_event_collector = NULL; |
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_vm_object_alloc_event_collector = NULL; |
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_sampled_object_alloc_event_collector = NULL; |
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_the_class_for_redefinition_verification = NULL; |
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_scratch_class_for_redefinition_verification = NULL; |
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_cur_stack_depth = UNKNOWN_STACK_DEPTH; |
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|
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// JVMTI ForceEarlyReturn support |
|
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_pending_step_for_earlyret = false; |
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_earlyret_state = earlyret_inactive; |
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_earlyret_tos = ilgl; |
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_earlyret_value.j = 0L; |
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_earlyret_oop = NULL; |
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||
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// add all the JvmtiEnvThreadState to the new JvmtiThreadState |
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{ |
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JvmtiEnvIterator it; |
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for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { |
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if (env->is_valid()) { |
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add_env(env); |
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} |
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} |
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} |
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// link us into the list |
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{ |
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// The thread state list manipulation code must not have safepoints. |
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// See periodic_clean_up(). |
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debug_only(NoSafepointVerifier nosafepoint;) |
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_prev = NULL; |
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_next = _head; |
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if (_head != NULL) { |
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_head->_prev = this; |
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} |
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_head = this; |
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} |
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// set this as the state for the thread |
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thread->set_jvmti_thread_state(this); |
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} |
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JvmtiThreadState::~JvmtiThreadState() { |
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assert(JvmtiThreadState_lock->is_locked(), "sanity check"); |
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// clear this as the state for the thread |
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get_thread()->set_jvmti_thread_state(NULL); |
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// zap our env thread states |
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{ |
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JvmtiEnvBase::entering_dying_thread_env_iteration(); |
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JvmtiEnvThreadStateIterator it(this); |
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for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ) { |
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JvmtiEnvThreadState* zap = ets; |
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ets = it.next(ets); |
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delete zap; |
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} |
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JvmtiEnvBase::leaving_dying_thread_env_iteration(); |
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} |
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// remove us from the list |
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{ |
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// The thread state list manipulation code must not have safepoints. |
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// See periodic_clean_up(). |
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debug_only(NoSafepointVerifier nosafepoint;) |
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if (_prev == NULL) { |
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assert(_head == this, "sanity check"); |
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_head = _next; |
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} else { |
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assert(_head != this, "sanity check"); |
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_prev->_next = _next; |
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} |
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if (_next != NULL) { |
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_next->_prev = _prev; |
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} |
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_next = NULL; |
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_prev = NULL; |
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} |
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} |
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void |
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JvmtiThreadState::periodic_clean_up() { |
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assert(SafepointSynchronize::is_at_safepoint(), "at safepoint"); |
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// This iteration is initialized with "_head" instead of "JvmtiThreadState::first()" |
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// because the latter requires the JvmtiThreadState_lock. |
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// This iteration is safe at a safepoint as well, see the NoSafepointVerifier |
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// asserts at all list manipulation sites. |
152 |
for (JvmtiThreadState *state = _head; state != NULL; state = state->next()) { |
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// For each environment thread state corresponding to an invalid environment |
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// unlink it from the list and deallocate it. |
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JvmtiEnvThreadStateIterator it(state); |
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JvmtiEnvThreadState* previous_ets = NULL; |
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JvmtiEnvThreadState* ets = it.first(); |
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while (ets != NULL) { |
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if (ets->get_env()->is_valid()) { |
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previous_ets = ets; |
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ets = it.next(ets); |
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} else { |
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// This one isn't valid, remove it from the list and deallocate it |
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JvmtiEnvThreadState* defunct_ets = ets; |
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ets = ets->next(); |
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if (previous_ets == NULL) { |
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assert(state->head_env_thread_state() == defunct_ets, "sanity check"); |
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state->set_head_env_thread_state(ets); |
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} else { |
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previous_ets->set_next(ets); |
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} |
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delete defunct_ets; |
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} |
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} |
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} |
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} |
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void JvmtiThreadState::add_env(JvmtiEnvBase *env) { |
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assert(JvmtiThreadState_lock->is_locked(), "sanity check"); |
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JvmtiEnvThreadState *new_ets = new JvmtiEnvThreadState(_thread, env); |
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// add this environment thread state to the end of the list (order is important) |
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{ |
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// list deallocation (which occurs at a safepoint) cannot occur simultaneously |
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debug_only(NoSafepointVerifier nosafepoint;) |
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JvmtiEnvThreadStateIterator it(this); |
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JvmtiEnvThreadState* previous_ets = NULL; |
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for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { |
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previous_ets = ets; |
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} |
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if (previous_ets == NULL) { |
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set_head_env_thread_state(new_ets); |
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} else { |
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previous_ets->set_next(new_ets); |
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} |
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} |
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} |
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void JvmtiThreadState::enter_interp_only_mode() { |
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assert(_thread->get_interp_only_mode() == 0, "entering interp only when mode not zero"); |
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_thread->increment_interp_only_mode(); |
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} |
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void JvmtiThreadState::leave_interp_only_mode() { |
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assert(_thread->get_interp_only_mode() == 1, "leaving interp only when mode not one"); |
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_thread->decrement_interp_only_mode(); |
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} |
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// Helper routine used in several places |
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int JvmtiThreadState::count_frames() { |
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guarantee(SafepointSynchronize::is_at_safepoint() || |
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(JavaThread *)Thread::current() == get_thread(), |
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"must be current thread or at safepoint"); |
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if (!get_thread()->has_last_Java_frame()) return 0; // no Java frames |
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ResourceMark rm; |
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RegisterMap reg_map(get_thread()); |
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javaVFrame *jvf = get_thread()->last_java_vframe(®_map); |
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int n = 0; |
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while (jvf != NULL) { |
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Method* method = jvf->method(); |
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jvf = jvf->java_sender(); |
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n++; |
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} |
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return n; |
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} |
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void JvmtiThreadState::invalidate_cur_stack_depth() { |
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guarantee(SafepointSynchronize::is_at_safepoint() || |
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(JavaThread *)Thread::current() == get_thread(), |
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"must be current thread or at safepoint"); |
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_cur_stack_depth = UNKNOWN_STACK_DEPTH; |
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} |
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void JvmtiThreadState::incr_cur_stack_depth() { |
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guarantee(JavaThread::current() == get_thread(), "must be current thread"); |
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if (!is_interp_only_mode()) { |
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_cur_stack_depth = UNKNOWN_STACK_DEPTH; |
|
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} |
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if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) { |
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++_cur_stack_depth; |
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} |
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} |
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254 |
||
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void JvmtiThreadState::decr_cur_stack_depth() { |
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256 |
guarantee(JavaThread::current() == get_thread(), "must be current thread"); |
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257 |
||
258 |
if (!is_interp_only_mode()) { |
|
259 |
_cur_stack_depth = UNKNOWN_STACK_DEPTH; |
|
260 |
} |
|
261 |
if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) { |
|
262 |
--_cur_stack_depth; |
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263 |
assert(_cur_stack_depth >= 0, "incr/decr_cur_stack_depth mismatch"); |
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264 |
} |
|
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} |
|
266 |
||
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int JvmtiThreadState::cur_stack_depth() { |
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guarantee(SafepointSynchronize::is_at_safepoint() || |
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(JavaThread *)Thread::current() == get_thread(), |
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"must be current thread or at safepoint"); |
1 | 271 |
|
272 |
if (!is_interp_only_mode() || _cur_stack_depth == UNKNOWN_STACK_DEPTH) { |
|
273 |
_cur_stack_depth = count_frames(); |
|
274 |
} else { |
|
275 |
// heavy weight assert |
|
276 |
assert(_cur_stack_depth == count_frames(), |
|
277 |
"cur_stack_depth out of sync"); |
|
278 |
} |
|
279 |
return _cur_stack_depth; |
|
280 |
} |
|
281 |
||
282 |
bool JvmtiThreadState::may_be_walked() { |
|
283 |
return (get_thread()->is_being_ext_suspended() || (JavaThread::current() == get_thread())); |
|
284 |
} |
|
285 |
||
286 |
||
287 |
void JvmtiThreadState::process_pending_step_for_popframe() { |
|
288 |
// We are single stepping as the last part of the PopFrame() dance |
|
289 |
// so we have some house keeping to do. |
|
290 |
||
291 |
JavaThread *thr = get_thread(); |
|
292 |
if (thr->popframe_condition() != JavaThread::popframe_inactive) { |
|
293 |
// If the popframe_condition field is not popframe_inactive, then |
|
294 |
// we missed all of the popframe_field cleanup points: |
|
295 |
// |
|
296 |
// - unpack_frames() was not called (nothing to deopt) |
|
297 |
// - remove_activation_preserving_args_entry() was not called |
|
298 |
// (did not get suspended in a call_vm() family call and did |
|
299 |
// not complete a call_vm() family call on the way here) |
|
300 |
thr->clear_popframe_condition(); |
|
301 |
} |
|
302 |
||
303 |
// clearing the flag indicates we are done with the PopFrame() dance |
|
304 |
clr_pending_step_for_popframe(); |
|
305 |
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// If exception was thrown in this frame, need to reset jvmti thread state. |
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// Single stepping may not get enabled correctly by the agent since |
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// exception state is passed in MethodExit event which may be sent at some |
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// time in the future. JDWP agent ignores MethodExit events if caused by |
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// an exception. |
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// |
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if (is_exception_detected()) { |
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clear_exception_state(); |
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314 |
} |
1 | 315 |
// If step is pending for popframe then it may not be |
316 |
// a repeat step. The new_bci and method_id is same as current_bci |
|
317 |
// and current method_id after pop and step for recursive calls. |
|
318 |
// Force the step by clearing the last location. |
|
319 |
JvmtiEnvThreadStateIterator it(this); |
|
320 |
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { |
|
321 |
ets->clear_current_location(); |
|
322 |
} |
|
323 |
} |
|
324 |
||
325 |
||
326 |
// Class: JvmtiThreadState |
|
327 |
// Function: update_for_pop_top_frame |
|
328 |
// Description: |
|
329 |
// This function removes any frame pop notification request for |
|
330 |
// the top frame and invalidates both the current stack depth and |
|
331 |
// all cached frameIDs. |
|
332 |
// |
|
333 |
// Called by: PopFrame |
|
334 |
// |
|
335 |
void JvmtiThreadState::update_for_pop_top_frame() { |
|
336 |
if (is_interp_only_mode()) { |
|
337 |
// remove any frame pop notification request for the top frame |
|
338 |
// in any environment |
|
339 |
int popframe_number = cur_stack_depth(); |
|
340 |
{ |
|
341 |
JvmtiEnvThreadStateIterator it(this); |
|
342 |
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { |
|
343 |
if (ets->is_frame_pop(popframe_number)) { |
|
344 |
ets->clear_frame_pop(popframe_number); |
|
345 |
} |
|
346 |
} |
|
347 |
} |
|
348 |
// force stack depth to be recalculated |
|
349 |
invalidate_cur_stack_depth(); |
|
350 |
} else { |
|
351 |
assert(!is_enabled(JVMTI_EVENT_FRAME_POP), "Must have no framepops set"); |
|
352 |
} |
|
353 |
} |
|
354 |
||
355 |
||
356 |
void JvmtiThreadState::process_pending_step_for_earlyret() { |
|
357 |
// We are single stepping as the last part of the ForceEarlyReturn |
|
358 |
// dance so we have some house keeping to do. |
|
359 |
||
360 |
if (is_earlyret_pending()) { |
|
361 |
// If the earlyret_state field is not earlyret_inactive, then |
|
362 |
// we missed all of the earlyret_field cleanup points: |
|
363 |
// |
|
364 |
// - remove_activation() was not called |
|
365 |
// (did not get suspended in a call_vm() family call and did |
|
366 |
// not complete a call_vm() family call on the way here) |
|
367 |
// |
|
368 |
// One legitimate way for us to miss all the cleanup points is |
|
369 |
// if we got here right after handling a compiled return. If that |
|
370 |
// is the case, then we consider our return from compiled code to |
|
371 |
// complete the ForceEarlyReturn request and we clear the condition. |
|
372 |
clr_earlyret_pending(); |
|
373 |
set_earlyret_oop(NULL); |
|
374 |
clr_earlyret_value(); |
|
375 |
} |
|
376 |
||
377 |
// clearing the flag indicates we are done with |
|
378 |
// the ForceEarlyReturn() dance |
|
379 |
clr_pending_step_for_earlyret(); |
|
380 |
||
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6972759: Step over not working after thrown exception and Pop
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changeset
|
381 |
// If exception was thrown in this frame, need to reset jvmti thread state. |
e616efa1a931
6972759: Step over not working after thrown exception and Pop
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changeset
|
382 |
// Single stepping may not get enabled correctly by the agent since |
e616efa1a931
6972759: Step over not working after thrown exception and Pop
bpittore
parents:
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diff
changeset
|
383 |
// exception state is passed in MethodExit event which may be sent at some |
e616efa1a931
6972759: Step over not working after thrown exception and Pop
bpittore
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diff
changeset
|
384 |
// time in the future. JDWP agent ignores MethodExit events if caused by |
e616efa1a931
6972759: Step over not working after thrown exception and Pop
bpittore
parents:
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diff
changeset
|
385 |
// an exception. |
e616efa1a931
6972759: Step over not working after thrown exception and Pop
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parents:
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diff
changeset
|
386 |
// |
e616efa1a931
6972759: Step over not working after thrown exception and Pop
bpittore
parents:
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diff
changeset
|
387 |
if (is_exception_detected()) { |
42895
c97cd79636ec
8165496: assert(_exception_caught == false) failed: _exception_caught is out of phase
dsamersoff
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changeset
|
388 |
clear_exception_state(); |
11588
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bpittore
parents:
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changeset
|
389 |
} |
1 | 390 |
// If step is pending for earlyret then it may not be a repeat step. |
391 |
// The new_bci and method_id is same as current_bci and current |
|
392 |
// method_id after earlyret and step for recursive calls. |
|
393 |
// Force the step by clearing the last location. |
|
394 |
JvmtiEnvThreadStateIterator it(this); |
|
395 |
for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { |
|
396 |
ets->clear_current_location(); |
|
397 |
} |
|
398 |
} |
|
399 |
||
400 |
void JvmtiThreadState::oops_do(OopClosure* f) { |
|
401 |
f->do_oop((oop*) &_earlyret_oop); |
|
402 |
} |