1 /*
   2  * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_HANDLES_INLINE_HPP
  26 #define SHARE_VM_RUNTIME_HANDLES_INLINE_HPP
  27 
  28 #include "runtime/handles.hpp"
  29 #include "runtime/thread.inline.hpp"
  30 
  31 // these inline functions are in a separate file to break an include cycle
  32 // between Thread and Handle
  33 
  34 inline Handle::Handle(Thread* thread, oop obj) {
  35   assert(thread == Thread::current(), "sanity check");
  36   if (obj == NULL) {
  37     _handle = NULL;
  38   } else {
  39     _handle = thread->handle_area()->allocate_handle(obj);
  40   }
  41 }
  42 
  43 // Constructor for metadata handles
  44 #define DEF_METADATA_HANDLE_FN(name, type) \
  45 inline name##Handle::name##Handle(type* obj) : _value(obj), _thread(NULL) {       \
  46   if (obj != NULL) {                                                   \
  47     assert(((Metadata*)obj)->is_valid(), "obj is valid");              \
  48     _thread = Thread::current();                                       \
  49     assert (_thread->is_in_stack((address)this), "not on stack?");     \
  50     _thread->metadata_handles()->push((Metadata*)obj);                 \
  51   }                                                                    \
  52 }                                                                      \
  53 inline name##Handle::name##Handle(Thread* thread, type* obj) : _value(obj), _thread(thread) { \
  54   if (obj != NULL) {                                                   \
  55     assert(((Metadata*)obj)->is_valid(), "obj is valid");              \
  56     assert(_thread == Thread::current(), "thread must be current");    \
  57     assert (_thread->is_in_stack((address)this), "not on stack?");     \
  58     _thread->metadata_handles()->push((Metadata*)obj);                 \
  59   }                                                                    \
  60 }                                                                      \
  61 
  62 DEF_METADATA_HANDLE_FN(method, Method)
  63 DEF_METADATA_HANDLE_FN(constantPool, ConstantPool)
  64 
  65 inline HandleMark::HandleMark() {
  66   initialize(Thread::current());
  67 }
  68 
  69 
  70 inline void HandleMark::push() {
  71   // This is intentionally a NOP. pop_and_restore will reset
  72   // values to the HandleMark further down the stack, typically
  73   // in JavaCalls::call_helper.
  74   debug_only(_area->_handle_mark_nesting++);
  75 }
  76 
  77 inline void HandleMark::pop_and_restore() {
  78   HandleArea* area = _area;   // help compilers with poor alias analysis
  79   // Delete later chunks
  80   if( _chunk->next() ) {
  81     // reset arena size before delete chunks. Otherwise, the total
  82     // arena size could exceed total chunk size
  83     assert(area->size_in_bytes() > size_in_bytes(), "Sanity check");
  84     area->set_size_in_bytes(size_in_bytes());
  85     _chunk->next_chop();
  86   } else {
  87     assert(area->size_in_bytes() == size_in_bytes(), "Sanity check");
  88   }
  89   // Roll back arena to saved top markers
  90   area->_chunk = _chunk;
  91   area->_hwm = _hwm;
  92   area->_max = _max;
  93   debug_only(area->_handle_mark_nesting--);
  94 }
  95 
  96 #endif // SHARE_VM_RUNTIME_HANDLES_INLINE_HPP