jdk8-mips64-public/hotspot: comparison src/share/vm/prims/jvmtiEnvThreadState.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* 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();
+}
+}

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/prims/jvmtiEnvThreadState.cpp

src/share/vm/prims/jvmtiEnvThreadState.cpp