/*
* Copyright ( c ) 1999 , 2022 , 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
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*/
#ifndef SHARE_PRIMS_JVMTIUTIL_HPP
#define SHARE_PRIMS_JVMTIUTIL_HPP
#include "jvmtifiles/jvmti.h"
#include "memory/resourceArea.hpp"
#include "prims/jvmtiEventController.hpp"
#include "runtime/threads.hpp"
///////////////////////////////////////////////////////////////
//
// class JvmtiUtil
//
// class for miscellaneous jvmti utility static methods
//
class JvmtiUtil : AllStatic {
static ResourceArea* _single_threaded_resource_area;
static const char * _error_names[];
static const bool _event_threaded[];
public :
static ResourceArea* single_threaded_resource_area();
static const char * error_name(int num) { return _error_names[num]; } // To Do: add range checking
static const bool has_event_capability(jvmtiEvent event_type, const jvmtiCapabilities* capabilities_ptr);
static const bool event_threaded(int num) {
if (num >= JVMTI_MIN_EVENT_TYPE_VAL && num <= JVMTI_MAX_EVENT_TYPE_VAL) {
return _event_threaded[num];
}
if (num >= EXT_MIN_EVENT_TYPE_VAL && num <= EXT_MAX_EVENT_TYPE_VAL) {
return (num != EXT_EVENT_CLASS_UNLOAD);
}
ShouldNotReachHere();
return false ;
}
};
///////////////////////////////////////////////////////////////
//
// class SafeResourceMark
//
// ResourceMarks that work before threads exist
//
class SafeResourceMark : public ResourceMark {
ResourceArea* safe_resource_area() {
Thread* thread;
if (Threads::number_of_threads() == 0 ) {
return JvmtiUtil::single_threaded_resource_area();
}
thread = Thread::current_or_null();
if (thread == NULL) {
return JvmtiUtil::single_threaded_resource_area();
}
return thread->resource_area();
}
public :
SafeResourceMark() : ResourceMark(safe_resource_area()) {}
};
#endif // SHARE_PRIMS_JVMTIUTIL_HPP
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