1 /*
   2  * Copyright (c) 1998, 2019, 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_RUNTIME_HANDLES_INLINE_HPP
  26 #define SHARE_RUNTIME_HANDLES_INLINE_HPP
  27 
  28 #include "runtime/handles.hpp"
  29 #include "runtime/thread.hpp"
  30 #include "oops/metadata.hpp"
  31 #include "oops/oop.hpp"
  32 
  33 // these inline functions are in a separate file to break an include cycle
  34 // between Thread and Handle
  35 
  36 inline Handle::Handle(Thread* thread, oop obj) {
  37   assert(thread == Thread::current(), "sanity check");
  38   if (obj == NULL) {
  39     _handle = NULL;
  40   } else {
  41     _handle = thread->handle_area()->allocate_handle(obj);
  42   }
  43 }
  44 
  45 // Inline constructors for Specific Handles for different oop types
  46 #define DEF_HANDLE_CONSTR(type, is_a)                   \
  47 inline type##Handle::type##Handle (Thread* thread, type##Oop obj) : Handle(thread, (oop)obj) { \
  48   assert(is_null() || ((oop)obj)->is_a(), "illegal type");                \
  49 }
  50 
  51 DEF_HANDLE_CONSTR(instance , is_instance_noinline )
  52 DEF_HANDLE_CONSTR(array    , is_array_noinline    )
  53 DEF_HANDLE_CONSTR(objArray , is_objArray_noinline )
  54 DEF_HANDLE_CONSTR(typeArray, is_typeArray_noinline)
  55 DEF_HANDLE_CONSTR(valueArray, is_valueArray_noinline)
  56 
  57 // Constructor for metadata handles
  58 #define DEF_METADATA_HANDLE_FN(name, type) \
  59 inline name##Handle::name##Handle(type* obj) : _value(obj), _thread(NULL) {       \
  60   if (obj != NULL) {                                                   \
  61     assert(((Metadata*)obj)->is_valid(), "obj is valid");              \
  62     _thread = Thread::current();                                       \
  63     assert (_thread->is_in_stack((address)this), "not on stack?");     \
  64     _thread->metadata_handles()->push((Metadata*)obj);                 \
  65   }                                                                    \
  66 }                                                                      \
  67 inline name##Handle::name##Handle(Thread* thread, type* obj) : _value(obj), _thread(thread) { \
  68   if (obj != NULL) {                                                   \
  69     assert(((Metadata*)obj)->is_valid(), "obj is valid");              \
  70     assert(_thread == Thread::current(), "thread must be current");    \
  71     assert (_thread->is_in_stack((address)this), "not on stack?");     \
  72     _thread->metadata_handles()->push((Metadata*)obj);                 \
  73   }                                                                    \
  74 }                                                                      \
  75 
  76 DEF_METADATA_HANDLE_FN(method, Method)
  77 DEF_METADATA_HANDLE_FN(constantPool, ConstantPool)
  78 
  79 inline HandleMark::HandleMark() {
  80   initialize(Thread::current());
  81 }
  82 
  83 inline void HandleMark::push() {
  84   // This is intentionally a NOP. pop_and_restore will reset
  85   // values to the HandleMark further down the stack, typically
  86   // in JavaCalls::call_helper.
  87   debug_only(_area->_handle_mark_nesting++);
  88 }
  89 
  90 inline void HandleMark::pop_and_restore() {
  91   // Delete later chunks
  92   if(_chunk->next() != NULL) {
  93     assert(_area->size_in_bytes() > size_in_bytes(), "Sanity check");
  94     chop_later_chunks();
  95   } else {
  96     assert(_area->size_in_bytes() == size_in_bytes(), "Sanity check");
  97   }
  98   // Roll back arena to saved top markers
  99   _area->_chunk = _chunk;
 100   _area->_hwm = _hwm;
 101   _area->_max = _max;
 102   debug_only(_area->_handle_mark_nesting--);
 103 }
 104 
 105 inline HandleMarkCleaner::HandleMarkCleaner(Thread* thread) {
 106   _thread = thread;
 107   _thread->last_handle_mark()->push();
 108 }
 109 
 110 inline HandleMarkCleaner::~HandleMarkCleaner() {
 111   _thread->last_handle_mark()->pop_and_restore();
 112 }
 113 
 114 #endif // SHARE_RUNTIME_HANDLES_INLINE_HPP