1 /*
2 * Copyright (c) 1998, 2013, 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 #ifndef SHARK
55 #define CHECK_IN_STACK() assert (_thread->is_in_stack((address)this), "not on stack?")
56 #else
57 #define CHECK_IN_STACK()
58 #endif
59
60 // Constructors for metadata handles
61 #define DEF_METADATA_HANDLE_FN(name, type) \
62 inline name##Handle::name##Handle(type* obj) : _value(obj), _thread(NULL) { \
63 if (obj != NULL) { \
64 assert(((Metadata*)obj)->is_valid(), "obj is valid"); \
65 _thread = Thread::current(); \
66 assert (_thread->is_in_stack((address)this), "not on stack?"); \
67 _thread->metadata_handles()->push((Metadata*)obj); \
68 } \
69 } \
70 inline name##Handle::name##Handle(Thread* thread, type* obj) : _value(obj), _thread(thread) { \
71 if (obj != NULL) { \
72 assert(((Metadata*)obj)->is_valid(), "obj is valid"); \
73 assert(_thread == Thread::current(), "thread must be current"); \
74 assert (_thread->is_in_stack((address)this), "not on stack?"); \
75 _thread->metadata_handles()->push((Metadata*)obj); \
76 } \
77 } \
78 inline name##Handle::name##Handle(const name##Handle &h) { \
79 _value = h._value; \
80 if (_value != NULL) { \
81 assert(_value->is_valid(), "obj is valid"); \
82 if (h._thread != NULL) { \
83 assert(h._thread == Thread::current(), "thread must be current");\
84 _thread = h._thread; \
85 } else { \
86 _thread = Thread::current(); \
87 } \
88 CHECK_IN_STACK(); \
89 _thread->metadata_handles()->push((Metadata*)_value); \
90 } else { \
91 _thread = NULL; \
92 } \
93 } \
94 inline name##Handle& name##Handle::operator=(const name##Handle &s) { \
95 remove(); \
96 _value = s._value; \
97 if (_value != NULL) { \
98 assert(_value->is_valid(), "obj is valid"); \
99 if (s._thread != NULL) { \
100 assert(s._thread == Thread::current(), "thread must be current");\
101 _thread = s._thread; \
102 } else { \
103 _thread = Thread::current(); \
104 } \
105 assert (_thread->is_in_stack((address)this), "not on stack?"); \
106 _thread->metadata_handles()->push((Metadata*)_value); \
107 } else { \
108 _thread = NULL; \
109 } \
110 return *this; \
111 } \
112 inline void name##Handle::remove() { \
113 if (_value != NULL) { \
114 int i = _thread->metadata_handles()->find_from_end((Metadata*)_value); \
115 assert(i!=-1, "not in metadata_handles list"); \
116 _thread->metadata_handles()->remove_at(i); \
117 } \
118 } \
119 inline name##Handle::~name##Handle () { remove(); } \
120
121 DEF_METADATA_HANDLE_FN(method, Method)
122 DEF_METADATA_HANDLE_FN(constantPool, ConstantPool)
123
124 #undef CHECK_IN_STACK
125
126 inline HandleMark::HandleMark() {
127 initialize(Thread::current());
128 }
129
130
131 inline void HandleMark::push() {
132 // This is intentionally a NOP. pop_and_restore will reset
133 // values to the HandleMark further down the stack, typically
134 // in JavaCalls::call_helper.
135 debug_only(_area->_handle_mark_nesting++);
136 }
137
138 inline void HandleMark::pop_and_restore() {
139 HandleArea* area = _area; // help compilers with poor alias analysis
140 // Delete later chunks
141 if( _chunk->next() ) {
142 // reset arena size before delete chunks. Otherwise, the total
143 // arena size could exceed total chunk size
144 assert(area->size_in_bytes() > size_in_bytes(), "Sanity check");
145 area->set_size_in_bytes(size_in_bytes());
146 _chunk->next_chop();
147 } else {
148 assert(area->size_in_bytes() == size_in_bytes(), "Sanity check");
149 }
150 // Roll back arena to saved top markers
151 area->_chunk = _chunk;
152 area->_hwm = _hwm;
153 area->_max = _max;
154 debug_only(area->_handle_mark_nesting--);
155 }
156
157 #endif // SHARE_VM_RUNTIME_HANDLES_INLINE_HPP