1 /*
2 * Copyright (c) 1998, 2018, 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
Handle(Thread * thread,oop obj)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 // Inline constructors for Specific Handles for different oop types
44 #define DEF_HANDLE_CONSTR(type, is_a) \
45 inline type##Handle::type##Handle (Thread* thread, type##Oop obj) : Handle(thread, (oop)obj) { \
46 assert(is_null() || ((oop)obj)->is_a(), "illegal type"); \
47 }
48
DEF_HANDLE_CONSTR(instance,is_instance_noinline)49 DEF_HANDLE_CONSTR(instance , is_instance_noinline )
50 DEF_HANDLE_CONSTR(array , is_array_noinline )
51 DEF_HANDLE_CONSTR(objArray , is_objArray_noinline )
52 DEF_HANDLE_CONSTR(typeArray, is_typeArray_noinline)
53
54 // Constructor for metadata handles
55 #define DEF_METADATA_HANDLE_FN(name, type) \
56 inline name##Handle::name##Handle(type* obj) : _value(obj), _thread(NULL) { \
57 if (obj != NULL) { \
58 assert(((Metadata*)obj)->is_valid(), "obj is valid"); \
59 _thread = Thread::current(); \
60 assert (_thread->is_in_stack((address)this), "not on stack?"); \
61 _thread->metadata_handles()->push((Metadata*)obj); \
62 } \
63 } \
64 inline name##Handle::name##Handle(Thread* thread, type* obj) : _value(obj), _thread(thread) { \
65 if (obj != NULL) { \
66 assert(((Metadata*)obj)->is_valid(), "obj is valid"); \
67 assert(_thread == Thread::current(), "thread must be current"); \
68 assert (_thread->is_in_stack((address)this), "not on stack?"); \
69 _thread->metadata_handles()->push((Metadata*)obj); \
70 } \
71 } \
72
73 DEF_METADATA_HANDLE_FN(method, Method)
74 DEF_METADATA_HANDLE_FN(constantPool, ConstantPool)
75
76 inline HandleMark::HandleMark() {
77 initialize(Thread::current());
78 }
79
80
push()81 inline void HandleMark::push() {
82 // This is intentionally a NOP. pop_and_restore will reset
83 // values to the HandleMark further down the stack, typically
84 // in JavaCalls::call_helper.
85 debug_only(_area->_handle_mark_nesting++);
86 }
87
pop_and_restore()88 inline void HandleMark::pop_and_restore() {
89 HandleArea* area = _area; // help compilers with poor alias analysis
90 // Delete later chunks
91 if( _chunk->next() ) {
92 // reset arena size before delete chunks. Otherwise, the total
93 // arena size could exceed total chunk size
94 assert(area->size_in_bytes() > size_in_bytes(), "Sanity check");
95 area->set_size_in_bytes(size_in_bytes());
96 _chunk->next_chop();
97 } else {
98 assert(area->size_in_bytes() == size_in_bytes(), "Sanity check");
99 }
100 // Roll back arena to saved top markers
101 area->_chunk = _chunk;
102 area->_hwm = _hwm;
103 area->_max = _max;
104 debug_only(area->_handle_mark_nesting--);
105 }
106
HandleMarkCleaner(Thread * thread)107 inline HandleMarkCleaner::HandleMarkCleaner(Thread* thread) {
108 _thread = thread;
109 _thread->last_handle_mark()->push();
110 }
111
~HandleMarkCleaner()112 inline HandleMarkCleaner::~HandleMarkCleaner() {
113 _thread->last_handle_mark()->pop_and_restore();
114 }
115
116 #endif // SHARE_VM_RUNTIME_HANDLES_INLINE_HPP
117