Clean up login in when running which kind of man page creation.
/*
* Copyright (c) 2003, 2017, 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.inline.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/signature.hpp"
#include "runtime/thread.inline.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() {
assert(get_thread() == Thread::current() || SafepointSynchronize::is_at_safepoint(),
"frame pop data only accessible from same thread or at safepoint");
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) {
assert(get_thread() == Thread::current() || SafepointSynchronize::is_at_safepoint(),
"frame pop data only accessible from same thread or at safepoint");
JvmtiFramePop fpop(frame_number);
JvmtiEventController::set_frame_pop(this, fpop);
}
void JvmtiEnvThreadState::clear_frame_pop(int frame_number) {
assert(get_thread() == Thread::current() || SafepointSynchronize::is_at_safepoint(),
"frame pop data only accessible from same thread or at safepoint");
JvmtiFramePop fpop(frame_number);
JvmtiEventController::clear_frame_pop(this, fpop);
}
void JvmtiEnvThreadState::clear_to_frame_pop(int frame_number) {
assert(get_thread() == Thread::current() || SafepointSynchronize::is_at_safepoint(),
"frame pop data only accessible from same thread or at safepoint");
JvmtiFramePop fpop(frame_number);
JvmtiEventController::clear_to_frame_pop(this, fpop);
}
bool JvmtiEnvThreadState::is_frame_pop(int cur_frame_number) {
assert(get_thread() == Thread::current() || SafepointSynchronize::is_at_safepoint(),
"frame pop data only accessible from same thread or at safepoint");
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();
}
}