src/hotspot/share/runtime/handles.inline.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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/*
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 * Copyright (c) 1998, 2017, 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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#ifndef SHARE_VM_RUNTIME_HANDLES_INLINE_HPP
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#define SHARE_VM_RUNTIME_HANDLES_INLINE_HPP
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#include "runtime/handles.hpp"
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#include "runtime/thread.inline.hpp"
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// these inline functions are in a separate file to break an include cycle
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// between Thread and Handle
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inline Handle::Handle(Thread* thread, oop obj) {
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  assert(thread == Thread::current(), "sanity check");
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  if (obj == NULL) {
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    _handle = NULL;
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  } else {
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    _handle = thread->handle_area()->allocate_handle(obj);
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  }
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}
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// Constructor for metadata handles
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#define DEF_METADATA_HANDLE_FN(name, type) \
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inline name##Handle::name##Handle(type* obj) : _value(obj), _thread(NULL) {       \
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  if (obj != NULL) {                                                   \
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    assert(((Metadata*)obj)->is_valid(), "obj is valid");              \
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    _thread = Thread::current();                                       \
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    assert (_thread->is_in_stack((address)this), "not on stack?");     \
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    _thread->metadata_handles()->push((Metadata*)obj);                 \
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  }                                                                    \
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}                                                                      \
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inline name##Handle::name##Handle(Thread* thread, type* obj) : _value(obj), _thread(thread) { \
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  if (obj != NULL) {                                                   \
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    assert(((Metadata*)obj)->is_valid(), "obj is valid");              \
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    assert(_thread == Thread::current(), "thread must be current");    \
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    assert (_thread->is_in_stack((address)this), "not on stack?");     \
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    _thread->metadata_handles()->push((Metadata*)obj);                 \
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  }                                                                    \
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}                                                                      \
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DEF_METADATA_HANDLE_FN(method, Method)
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DEF_METADATA_HANDLE_FN(constantPool, ConstantPool)
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inline HandleMark::HandleMark() {
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  initialize(Thread::current());
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}
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inline void HandleMark::push() {
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  // This is intentionally a NOP. pop_and_restore will reset
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  // values to the HandleMark further down the stack, typically
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  // in JavaCalls::call_helper.
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  debug_only(_area->_handle_mark_nesting++);
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}
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inline void HandleMark::pop_and_restore() {
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  HandleArea* area = _area;   // help compilers with poor alias analysis
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  // Delete later chunks
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  if( _chunk->next() ) {
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    // reset arena size before delete chunks. Otherwise, the total
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    // arena size could exceed total chunk size
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    assert(area->size_in_bytes() > size_in_bytes(), "Sanity check");
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    area->set_size_in_bytes(size_in_bytes());
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    _chunk->next_chop();
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  } else {
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    assert(area->size_in_bytes() == size_in_bytes(), "Sanity check");
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  }
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  // Roll back arena to saved top markers
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  area->_chunk = _chunk;
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  area->_hwm = _hwm;
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  area->_max = _max;
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  debug_only(area->_handle_mark_nesting--);
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}
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#endif // SHARE_VM_RUNTIME_HANDLES_INLINE_HPP