| /* |
| * Copyright (c) 2003, 2014, 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 "classfile/systemDictionary.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "jvmtifiles/jvmtiEnv.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "prims/jvmtiEnvThreadState.hpp" |
| #include "prims/jvmtiEventController.inline.hpp" |
| #include "prims/jvmtiImpl.hpp" |
| #include "runtime/handles.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/interfaceSupport.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/signature.hpp" |
| #include "runtime/vframe.hpp" |
| #include "runtime/vm_operations.hpp" |
| |
| |
| /////////////////////////////////////////////////////////////// |
| // |
| // class JvmtiFramePop |
| // |
| |
| #ifndef PRODUCT |
| void JvmtiFramePop::print() { |
| tty->print_cr("_frame_number=%d", _frame_number); |
| } |
| #endif |
| |
| |
| /////////////////////////////////////////////////////////////// |
| // |
| // class JvmtiFramePops - private methods |
| // |
| |
| void |
| JvmtiFramePops::set(JvmtiFramePop& fp) { |
| if (_pops->find(fp.frame_number()) < 0) { |
| _pops->append(fp.frame_number()); |
| } |
| } |
| |
| |
| void |
| JvmtiFramePops::clear(JvmtiFramePop& fp) { |
| assert(_pops->length() > 0, "No more frame pops"); |
| |
| _pops->remove(fp.frame_number()); |
| } |
| |
| |
| int |
| JvmtiFramePops::clear_to(JvmtiFramePop& fp) { |
| int cleared = 0; |
| int index = 0; |
| while (index < _pops->length()) { |
| JvmtiFramePop pop = JvmtiFramePop(_pops->at(index)); |
| if (pop.above_on_stack(fp)) { |
| _pops->remove_at(index); |
| ++cleared; |
| } else { |
| ++index; |
| } |
| } |
| return cleared; |
| } |
| |
| |
| /////////////////////////////////////////////////////////////// |
| // |
| // class JvmtiFramePops - public methods |
| // |
| |
| JvmtiFramePops::JvmtiFramePops() { |
| _pops = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int> (2, true); |
| } |
| |
| JvmtiFramePops::~JvmtiFramePops() { |
| // return memory to c_heap. |
| delete _pops; |
| } |
| |
| |
| #ifndef PRODUCT |
| void JvmtiFramePops::print() { |
| ResourceMark rm; |
| |
| int n = _pops->length(); |
| for (int i=0; i<n; i++) { |
| JvmtiFramePop fp = JvmtiFramePop(_pops->at(i)); |
| tty->print("%d: ", i); |
| fp.print(); |
| tty->cr(); |
| } |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////// |
| // |
| // class JvmtiEnvThreadState |
| // |
| // Instances of JvmtiEnvThreadState hang off of each JvmtiThreadState, |
| // one per JvmtiEnv. |
| // |
| |
| JvmtiEnvThreadState::JvmtiEnvThreadState(JavaThread *thread, JvmtiEnvBase *env) : |
| _event_enable() { |
| _thread = thread; |
| _env = (JvmtiEnv*)env; |
| _next = NULL; |
| _frame_pops = NULL; |
| _current_bci = 0; |
| _current_method_id = NULL; |
| _breakpoint_posted = false; |
| _single_stepping_posted = false; |
| _agent_thread_local_storage_data = NULL; |
| } |
| |
| JvmtiEnvThreadState::~JvmtiEnvThreadState() { |
| delete _frame_pops; |
| _frame_pops = NULL; |
| } |
| |
| // Given that a new (potential) event has come in, |
| // maintain the current JVMTI location on a per-thread per-env basis |
| // and use it to filter out duplicate events: |
| // - instruction rewrites |
| // - breakpoint followed by single step |
| // - single step at a breakpoint |
| void JvmtiEnvThreadState::compare_and_set_current_location(Method* new_method, |
| address new_location, jvmtiEvent event) { |
| |
| int new_bci = new_location - new_method->code_base(); |
| |
| // The method is identified and stored as a jmethodID which is safe in this |
| // case because the class cannot be unloaded while a method is executing. |
| jmethodID new_method_id = new_method->jmethod_id(); |
| |
| // the last breakpoint or single step was at this same location |
| if (_current_bci == new_bci && _current_method_id == new_method_id) { |
| switch (event) { |
| case JVMTI_EVENT_BREAKPOINT: |
| // Repeat breakpoint is complicated. If we previously posted a breakpoint |
| // event at this location and if we also single stepped at this location |
| // then we skip the duplicate breakpoint. |
| _breakpoint_posted = _breakpoint_posted && _single_stepping_posted; |
| break; |
| case JVMTI_EVENT_SINGLE_STEP: |
| // Repeat single step is easy: just don't post it again. |
| // 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. |
| // This has been handled by clearing the location |
| _single_stepping_posted = true; |
| break; |
| default: |
| assert(false, "invalid event value passed"); |
| break; |
| } |
| return; |
| } |
| |
| set_current_location(new_method_id, new_bci); |
| _breakpoint_posted = false; |
| _single_stepping_posted = false; |
| } |
| |
| |
| JvmtiFramePops* JvmtiEnvThreadState::get_frame_pops() { |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
| "frame pop data only accessible from same thread or while suspended"); |
| |
| if (_frame_pops == NULL) { |
| _frame_pops = new JvmtiFramePops(); |
| assert(_frame_pops != NULL, "_frame_pops != NULL"); |
| } |
| return _frame_pops; |
| } |
| |
| |
| bool JvmtiEnvThreadState::has_frame_pops() { |
| return _frame_pops == NULL? false : (_frame_pops->length() > 0); |
| } |
| |
| void JvmtiEnvThreadState::set_frame_pop(int frame_number) { |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
| "frame pop data only accessible from same thread or while suspended"); |
| JvmtiFramePop fpop(frame_number); |
| JvmtiEventController::set_frame_pop(this, fpop); |
| } |
| |
| |
| void JvmtiEnvThreadState::clear_frame_pop(int frame_number) { |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
| "frame pop data only accessible from same thread or while suspended"); |
| JvmtiFramePop fpop(frame_number); |
| JvmtiEventController::clear_frame_pop(this, fpop); |
| } |
| |
| |
| void JvmtiEnvThreadState::clear_to_frame_pop(int frame_number) { |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
| "frame pop data only accessible from same thread or while suspended"); |
| JvmtiFramePop fpop(frame_number); |
| JvmtiEventController::clear_to_frame_pop(this, fpop); |
| } |
| |
| |
| bool JvmtiEnvThreadState::is_frame_pop(int cur_frame_number) { |
| #ifdef ASSERT |
| uint32_t debug_bits = 0; |
| #endif |
| assert(get_thread() == Thread::current() || JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits), |
| "frame pop data only accessible from same thread or while suspended"); |
| if (!get_thread()->is_interp_only_mode() || _frame_pops == NULL) { |
| return false; |
| } |
| JvmtiFramePop fp(cur_frame_number); |
| return get_frame_pops()->contains(fp); |
| } |
| |
| |
| class VM_GetCurrentLocation : public VM_Operation { |
| private: |
| JavaThread *_thread; |
| jmethodID _method_id; |
| int _bci; |
| |
| public: |
| VM_GetCurrentLocation(JavaThread *thread) { |
| _thread = thread; |
| } |
| VMOp_Type type() const { return VMOp_GetCurrentLocation; } |
| void doit() { |
| ResourceMark rmark; // _thread != Thread::current() |
| RegisterMap rm(_thread, false); |
| // There can be a race condition between a VM_Operation reaching a safepoint |
| // and the target thread exiting from Java execution. |
| // We must recheck the last Java frame still exists. |
| if (!_thread->is_exiting() && _thread->has_last_Java_frame()) { |
| javaVFrame* vf = _thread->last_java_vframe(&rm); |
| assert(vf != NULL, "must have last java frame"); |
| Method* method = vf->method(); |
| _method_id = method->jmethod_id(); |
| _bci = vf->bci(); |
| } else { |
| // Clear current location as the target thread has no Java frames anymore. |
| _method_id = (jmethodID)NULL; |
| _bci = 0; |
| } |
| } |
| void get_current_location(jmethodID *method_id, int *bci) { |
| *method_id = _method_id; |
| *bci = _bci; |
| } |
| }; |
| |
| void JvmtiEnvThreadState::reset_current_location(jvmtiEvent event_type, bool enabled) { |
| assert(event_type == JVMTI_EVENT_SINGLE_STEP || event_type == JVMTI_EVENT_BREAKPOINT, |
| "must be single-step or breakpoint event"); |
| |
| // Current location is used to detect the following: |
| // 1) a breakpoint event followed by single-stepping to the same bci |
| // 2) single-step to a bytecode that will be transformed to a fast version |
| // We skip to avoid posting the duplicate single-stepping event. |
| |
| // If single-stepping is disabled, clear current location so that |
| // single-stepping to the same method and bcp at a later time will be |
| // detected if single-stepping is enabled at that time (see 4388912). |
| |
| // If single-stepping is enabled, set the current location to the |
| // current method and bcp. This covers the following type of case, |
| // e.g., the debugger stepi command: |
| // - bytecode single stepped |
| // - SINGLE_STEP event posted and SINGLE_STEP event disabled |
| // - SINGLE_STEP event reenabled |
| // - bytecode rewritten to fast version |
| |
| // If breakpoint event is disabled, clear current location only if |
| // single-stepping is not enabled. Otherwise, keep the thread location |
| // to detect any duplicate events. |
| |
| if (enabled) { |
| // If enabling breakpoint, no need to reset. |
| // Can't do anything if empty stack. |
| if (event_type == JVMTI_EVENT_SINGLE_STEP && _thread->has_last_Java_frame()) { |
| jmethodID method_id; |
| int bci; |
| // The java thread stack may not be walkable for a running thread |
| // so get current location at safepoint. |
| VM_GetCurrentLocation op(_thread); |
| VMThread::execute(&op); |
| op.get_current_location(&method_id, &bci); |
| set_current_location(method_id, bci); |
| } |
| } else if (event_type == JVMTI_EVENT_SINGLE_STEP || !is_enabled(JVMTI_EVENT_SINGLE_STEP)) { |
| // If this is to disable breakpoint, also check if single-step is not enabled |
| clear_current_location(); |
| } |
| } |