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annotate src/share/vm/runtime/handles.inline.hpp @ 12144:d8e99408faad

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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193 Summary: don't re-evaluate stack bounds for main thread before install guard page Reviewed-by: coleenp, dholmes, dlong
author dsamersoff
date Thu, 29 Aug 2013 21:48:23 +0400
parents cc6a617fffd2
children 4f9a42c33738
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1 /*
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_RUNTIME_HANDLES_INLINE_HPP
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26 #define SHARE_VM_RUNTIME_HANDLES_INLINE_HPP
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27
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28 #include "runtime/handles.hpp"
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29 #include "runtime/thread.inline.hpp"
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30
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31 // these inline functions are in a separate file to break an include cycle
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32 // between Thread and Handle
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33
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34 inline Handle::Handle(oop obj) {
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35 if (obj == NULL) {
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36 _handle = NULL;
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37 } else {
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38 _handle = Thread::current()->handle_area()->allocate_handle(obj);
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39 }
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40 }
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41
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42
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43 #ifndef ASSERT
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44 inline Handle::Handle(Thread* thread, oop obj) {
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45 assert(thread == Thread::current(), "sanity check");
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46 if (obj == NULL) {
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47 _handle = NULL;
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48 } else {
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49 _handle = thread->handle_area()->allocate_handle(obj);
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50 }
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51 }
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52 #endif // ASSERT
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53
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54 // Constructors for metadata handles
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55 #define DEF_METADATA_HANDLE_FN(name, type) \
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56 inline name##Handle::name##Handle(type* obj) : _value(obj), _thread(NULL) { \
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57 if (obj != NULL) { \
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58 assert(((Metadata*)obj)->is_valid(), "obj is valid"); \
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59 _thread = Thread::current(); \
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60 assert (_thread->is_in_stack((address)this), "not on stack?"); \
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61 _thread->metadata_handles()->push((Metadata*)obj); \
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62 } \
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63 } \
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64 inline name##Handle::name##Handle(Thread* thread, type* obj) : _value(obj), _thread(thread) { \
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65 if (obj != NULL) { \
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66 assert(((Metadata*)obj)->is_valid(), "obj is valid"); \
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67 assert(_thread == Thread::current(), "thread must be current"); \
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68 assert (_thread->is_in_stack((address)this), "not on stack?"); \
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69 _thread->metadata_handles()->push((Metadata*)obj); \
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70 } \
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71 } \
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72 inline name##Handle::name##Handle(const name##Handle &h) { \
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73 _value = h._value; \
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74 if (_value != NULL) { \
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75 assert(_value->is_valid(), "obj is valid"); \
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76 if (h._thread != NULL) { \
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77 assert(h._thread == Thread::current(), "thread must be current");\
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78 _thread = h._thread; \
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79 } else { \
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80 _thread = Thread::current(); \
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81 } \
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82 _thread->metadata_handles()->push((Metadata*)_value); \
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83 } else { \
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84 _thread = NULL; \
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85 } \
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86 } \
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87 inline name##Handle& name##Handle::operator=(const name##Handle &s) { \
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88 remove(); \
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89 _value = s._value; \
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90 if (_value != NULL) { \
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91 assert(_value->is_valid(), "obj is valid"); \
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92 if (s._thread != NULL) { \
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93 assert(s._thread == Thread::current(), "thread must be current");\
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94 _thread = s._thread; \
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95 } else { \
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96 _thread = Thread::current(); \
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97 } \
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98 _thread->metadata_handles()->push((Metadata*)_value); \
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99 } else { \
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100 _thread = NULL; \
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101 } \
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102 return *this; \
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103 } \
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104 inline void name##Handle::remove() { \
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105 if (_value != NULL) { \
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106 int i = _thread->metadata_handles()->find_from_end((Metadata*)_value); \
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107 assert(i!=-1, "not in metadata_handles list"); \
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108 _thread->metadata_handles()->remove_at(i); \
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109 } \
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110 } \
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111 inline name##Handle::~name##Handle () { remove(); } \
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112
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113 DEF_METADATA_HANDLE_FN(method, Method)
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114 DEF_METADATA_HANDLE_FN(constantPool, ConstantPool)
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115
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116 inline HandleMark::HandleMark() {
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117 initialize(Thread::current());
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118 }
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119
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120
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121 inline void HandleMark::push() {
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122 // This is intentionally a NOP. pop_and_restore will reset
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123 // values to the HandleMark further down the stack, typically
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124 // in JavaCalls::call_helper.
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125 debug_only(_area->_handle_mark_nesting++);
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126 }
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127
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128 inline void HandleMark::pop_and_restore() {
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129 HandleArea* area = _area; // help compilers with poor alias analysis
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130 // Delete later chunks
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131 if( _chunk->next() ) {
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132 // reset arena size before delete chunks. Otherwise, the total
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133 // arena size could exceed total chunk size
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134 assert(area->size_in_bytes() > size_in_bytes(), "Sanity check");
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135 area->set_size_in_bytes(size_in_bytes());
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136 _chunk->next_chop();
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137 } else {
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138 assert(area->size_in_bytes() == size_in_bytes(), "Sanity check");
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139 }
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140 // Roll back arena to saved top markers
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141 area->_chunk = _chunk;
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142 area->_hwm = _hwm;
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143 area->_max = _max;
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144 debug_only(area->_handle_mark_nesting--);
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145 }
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146
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147 #endif // SHARE_VM_RUNTIME_HANDLES_INLINE_HPP