1 /*
2 * Copyright (c) 1998, 2012, 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(oop obj) {
35 if (obj == NULL) {
36 _handle = NULL;
37 } else {
38 _handle = Thread::current()->handle_area()->allocate_handle(obj);
39 }
40 }
41
42
43 #ifndef ASSERT
44 inline Handle::Handle(Thread* thread, oop obj) {
45 assert(thread == Thread::current(), "sanity check");
46 if (obj == NULL) {
47 _handle = NULL;
48 } else {
49 _handle = thread->handle_area()->allocate_handle(obj);
50 }
51 }
52 #endif // ASSERT
53
54 // Constructors 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 inline name##Handle::name##Handle(const name##Handle &h) { \
73 _value = h._value; \
74 if (_value != NULL) { \
75 assert(_value->is_valid(), "obj is valid"); \
76 if (h._thread != NULL) { \
77 assert(h._thread == Thread::current(), "thread must be current");\
78 _thread = h._thread; \
79 } else { \
80 _thread = Thread::current(); \
81 } \
82 _thread->metadata_handles()->push((Metadata*)_value); \
83 } \
84 } \
85 inline name##Handle& name##Handle::operator=(const name##Handle &s) { \
86 remove(); \
87 _value = s._value; \
88 if (_value != NULL) { \
89 assert(_value->is_valid(), "obj is valid"); \
90 if (s._thread != NULL) { \
91 assert(s._thread == Thread::current(), "thread must be current");\
92 _thread = s._thread; \
93 } else { \
94 _thread = Thread::current(); \
95 } \
96 _thread->metadata_handles()->push((Metadata*)_value); \
97 } \
98 return *this; \
99 } \
100 inline void name##Handle::remove() { \
101 if (_value != NULL) { \
102 int i = _thread->metadata_handles()->find_from_end((Metadata*)_value); \
103 assert(i!=-1, "not in metadata_handles list"); \
104 _thread->metadata_handles()->remove_at(i); \
105 } \
106 } \
107 inline name##Handle::~name##Handle () { remove(); } \
108
109 DEF_METADATA_HANDLE_FN(method, Method)
110 DEF_METADATA_HANDLE_FN(constantPool, ConstantPool)
111
112 inline HandleMark::HandleMark() {
113 initialize(Thread::current());
114 }
115
116
117 inline void HandleMark::push() {
118 // This is intentionally a NOP. pop_and_restore will reset
119 // values to the HandleMark further down the stack, typically
120 // in JavaCalls::call_helper.
121 debug_only(_area->_handle_mark_nesting++);
122 }
123
124 inline void HandleMark::pop_and_restore() {
125 HandleArea* area = _area; // help compilers with poor alias analysis
126 // Delete later chunks
127 if( _chunk->next() ) {
128 // reset arena size before delete chunks. Otherwise, the total
129 // arena size could exceed total chunk size
130 assert(area->size_in_bytes() > size_in_bytes(), "Sanity check");
131 area->set_size_in_bytes(size_in_bytes());
132 _chunk->next_chop();
133 } else {
134 assert(area->size_in_bytes() == size_in_bytes(), "Sanity check");
135 }
136 // Roll back arena to saved top markers
137 area->_chunk = _chunk;
138 area->_hwm = _hwm;
139 area->_max = _max;
140 debug_only(area->_handle_mark_nesting--);
141 }
142
143 #endif // SHARE_VM_RUNTIME_HANDLES_INLINE_HPP