Mercurial > hg > truffle
annotate src/share/vm/oops/oop.inline.hpp @ 7811:94ea9a864fc6
Remove usages of VmIds.toString.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 18 Feb 2013 19:08:52 -0800 |
parents | e522a00b91aa |
children | 5fc51c1ecdeb |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OOPS_OOP_INLINE_HPP |
26 #define SHARE_VM_OOPS_OOP_INLINE_HPP | |
27 | |
28 #include "gc_implementation/shared/ageTable.hpp" | |
29 #include "gc_implementation/shared/markSweep.inline.hpp" | |
30 #include "gc_interface/collectedHeap.inline.hpp" | |
31 #include "memory/barrierSet.inline.hpp" | |
32 #include "memory/cardTableModRefBS.hpp" | |
33 #include "memory/genCollectedHeap.hpp" | |
34 #include "memory/generation.hpp" | |
35 #include "memory/specialized_oop_closures.hpp" | |
36 #include "oops/arrayKlass.hpp" | |
37 #include "oops/arrayOop.hpp" | |
38 #include "oops/klass.hpp" | |
39 #include "oops/markOop.inline.hpp" | |
40 #include "oops/oop.hpp" | |
41 #include "runtime/atomic.hpp" | |
42 #include "runtime/os.hpp" | |
43 #ifdef TARGET_ARCH_x86 | |
44 # include "bytes_x86.hpp" | |
45 #endif | |
46 #ifdef TARGET_ARCH_sparc | |
47 # include "bytes_sparc.hpp" | |
48 #endif | |
49 #ifdef TARGET_ARCH_zero | |
50 # include "bytes_zero.hpp" | |
51 #endif | |
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52 #ifdef TARGET_ARCH_arm |
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53 # include "bytes_arm.hpp" |
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54 #endif |
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55 #ifdef TARGET_ARCH_ppc |
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56 # include "bytes_ppc.hpp" |
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57 #endif |
1972 | 58 |
0 | 59 // Implementation of all inlined member functions defined in oop.hpp |
60 // We need a separate file to avoid circular references | |
61 | |
62 inline void oopDesc::release_set_mark(markOop m) { | |
63 OrderAccess::release_store_ptr(&_mark, m); | |
64 } | |
65 | |
66 inline markOop oopDesc::cas_set_mark(markOop new_mark, markOop old_mark) { | |
67 return (markOop) Atomic::cmpxchg_ptr(new_mark, &_mark, old_mark); | |
68 } | |
69 | |
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70 inline Klass* oopDesc::klass() const { |
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71 if (UseCompressedKlassPointers) { |
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72 return decode_klass_not_null(_metadata._compressed_klass); |
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73 } else { |
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74 return _metadata._klass; |
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75 } |
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76 } |
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77 |
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78 inline Klass* oopDesc::klass_or_null() const volatile { |
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79 // can be NULL in CMS |
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80 if (UseCompressedKlassPointers) { |
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81 return decode_klass(_metadata._compressed_klass); |
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82 } else { |
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83 return _metadata._klass; |
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84 } |
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85 } |
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86 |
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87 inline int oopDesc::klass_gap_offset_in_bytes() { |
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88 assert(UseCompressedKlassPointers, "only applicable to compressed klass pointers"); |
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89 return oopDesc::klass_offset_in_bytes() + sizeof(narrowOop); |
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90 } |
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91 |
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92 inline Klass** oopDesc::klass_addr() { |
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93 // Only used internally and with CMS and will not work with |
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94 // UseCompressedOops |
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95 assert(!UseCompressedKlassPointers, "only supported with uncompressed klass pointers"); |
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96 return (Klass**) &_metadata._klass; |
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97 } |
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98 |
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99 inline narrowOop* oopDesc::compressed_klass_addr() { |
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100 assert(UseCompressedKlassPointers, "only called by compressed klass pointers"); |
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101 return (narrowOop*) &_metadata._compressed_klass; |
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102 } |
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103 |
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104 inline void oopDesc::set_klass(Klass* k) { |
0 | 105 // since klasses are promoted no store check is needed |
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106 assert(Universe::is_bootstrapping() || k != NULL, "must be a real Klass*"); |
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107 assert(Universe::is_bootstrapping() || k->is_klass(), "not a Klass*"); |
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108 if (UseCompressedKlassPointers) { |
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109 *compressed_klass_addr() = encode_klass_not_null(k); |
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110 } else { |
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111 *klass_addr() = k; |
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112 } |
0 | 113 } |
114 | |
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115 inline int oopDesc::klass_gap() const { |
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116 return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()); |
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117 } |
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118 |
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119 inline void oopDesc::set_klass_gap(int v) { |
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120 if (UseCompressedKlassPointers) { |
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121 *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()) = v; |
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122 } |
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123 } |
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124 |
0 | 125 inline void oopDesc::set_klass_to_list_ptr(oop k) { |
126 // This is only to be used during GC, for from-space objects, so no | |
127 // barrier is needed. | |
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128 if (UseCompressedKlassPointers) { |
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129 _metadata._compressed_klass = encode_heap_oop(k); // may be null (parnew overflow handling) |
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130 } else { |
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131 _metadata._klass = (Klass*)(address)k; |
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132 } |
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133 } |
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134 |
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135 inline oop oopDesc::list_ptr_from_klass() { |
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136 // This is only to be used during GC, for from-space objects. |
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137 if (UseCompressedKlassPointers) { |
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138 return decode_heap_oop(_metadata._compressed_klass); |
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139 } else { |
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140 // Special case for GC |
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141 return (oop)(address)_metadata._klass; |
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142 } |
0 | 143 } |
144 | |
145 inline void oopDesc::init_mark() { set_mark(markOopDesc::prototype_for_object(this)); } | |
146 | |
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147 inline bool oopDesc::is_a(Klass* k) const { return klass()->is_subtype_of(k); } |
0 | 148 |
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149 inline bool oopDesc::is_instance() const { return klass()->oop_is_instance(); } |
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150 inline bool oopDesc::is_instanceMirror() const { return klass()->oop_is_instanceMirror(); } |
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151 inline bool oopDesc::is_instanceRef() const { return klass()->oop_is_instanceRef(); } |
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152 inline bool oopDesc::is_array() const { return klass()->oop_is_array(); } |
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153 inline bool oopDesc::is_objArray() const { return klass()->oop_is_objArray(); } |
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154 inline bool oopDesc::is_typeArray() const { return klass()->oop_is_typeArray(); } |
0 | 155 |
156 inline void* oopDesc::field_base(int offset) const { return (void*)&((char*)this)[offset]; } | |
157 | |
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158 template <class T> inline T* oopDesc::obj_field_addr(int offset) const { return (T*)field_base(offset); } |
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159 inline Metadata** oopDesc::metadata_field_addr(int offset) const { return (Metadata**)field_base(offset); } |
0 | 160 inline jbyte* oopDesc::byte_field_addr(int offset) const { return (jbyte*) field_base(offset); } |
161 inline jchar* oopDesc::char_field_addr(int offset) const { return (jchar*) field_base(offset); } | |
162 inline jboolean* oopDesc::bool_field_addr(int offset) const { return (jboolean*)field_base(offset); } | |
163 inline jint* oopDesc::int_field_addr(int offset) const { return (jint*) field_base(offset); } | |
164 inline jshort* oopDesc::short_field_addr(int offset) const { return (jshort*) field_base(offset); } | |
165 inline jlong* oopDesc::long_field_addr(int offset) const { return (jlong*) field_base(offset); } | |
166 inline jfloat* oopDesc::float_field_addr(int offset) const { return (jfloat*) field_base(offset); } | |
167 inline jdouble* oopDesc::double_field_addr(int offset) const { return (jdouble*) field_base(offset); } | |
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168 inline address* oopDesc::address_field_addr(int offset) const { return (address*) field_base(offset); } |
0 | 169 |
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170 |
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171 // Functions for getting and setting oops within instance objects. |
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172 // If the oops are compressed, the type passed to these overloaded functions |
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173 // is narrowOop. All functions are overloaded so they can be called by |
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174 // template functions without conditionals (the compiler instantiates via |
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175 // the right type and inlines the appopriate code). |
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176 |
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177 inline bool oopDesc::is_null(oop obj) { return obj == NULL; } |
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178 inline bool oopDesc::is_null(Klass* obj) { return obj == NULL; } |
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179 inline bool oopDesc::is_null(narrowOop obj) { return obj == 0; } |
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180 |
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181 // Algorithm for encoding and decoding oops from 64 bit pointers to 32 bit |
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182 // offset from the heap base. Saving the check for null can save instructions |
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183 // in inner GC loops so these are separated. |
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184 |
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185 inline bool check_obj_alignment(oop obj) { |
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186 return (intptr_t)obj % MinObjAlignmentInBytes == 0; |
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187 } |
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188 inline bool check_klass_alignment(Klass* obj) { |
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189 return (intptr_t)obj % KlassAlignmentInBytes == 0; |
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190 } |
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191 |
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192 inline narrowOop oopDesc::encode_heap_oop_not_null(oop v) { |
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193 assert(!is_null(v), "oop value can never be zero"); |
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194 assert(check_obj_alignment(v), "Address not aligned"); |
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195 assert(Universe::heap()->is_in_reserved(v), "Address not in heap"); |
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196 address base = Universe::narrow_oop_base(); |
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197 int shift = Universe::narrow_oop_shift(); |
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198 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1)); |
135
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199 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding"); |
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200 uint64_t result = pd >> shift; |
135
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201 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow"); |
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202 assert(decode_heap_oop(result) == v, "reversibility"); |
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203 return (narrowOop)result; |
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204 } |
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205 |
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206 inline narrowOop oopDesc::encode_heap_oop(oop v) { |
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207 return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v); |
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208 } |
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209 |
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210 inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) { |
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211 assert(!is_null(v), "narrow oop value can never be zero"); |
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212 address base = Universe::narrow_oop_base(); |
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213 int shift = Universe::narrow_oop_shift(); |
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214 oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift)); |
1846 | 215 assert(check_obj_alignment(result), err_msg("address not aligned: " PTR_FORMAT, (void*) result)); |
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216 return result; |
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217 } |
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218 |
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219 inline oop oopDesc::decode_heap_oop(narrowOop v) { |
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220 return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v); |
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221 } |
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222 |
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223 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; } |
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224 inline oop oopDesc::decode_heap_oop(oop v) { return v; } |
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225 |
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226 // Encoding and decoding for klass field. It is copied code, but someday |
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227 // might not be the same as oop. |
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228 |
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229 inline narrowOop oopDesc::encode_klass_not_null(Klass* v) { |
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230 assert(!is_null(v), "oop value can never be zero"); |
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231 assert(check_klass_alignment(v), "Address not aligned"); |
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232 address base = Universe::narrow_klass_base(); |
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233 int shift = Universe::narrow_klass_shift(); |
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234 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1)); |
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235 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding"); |
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236 uint64_t result = pd >> shift; |
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237 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow"); |
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238 assert(decode_klass(result) == v, "reversibility"); |
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239 return (narrowOop)result; |
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240 } |
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241 |
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242 inline narrowOop oopDesc::encode_klass(Klass* v) { |
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243 return (is_null(v)) ? (narrowOop)0 : encode_klass_not_null(v); |
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244 } |
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245 |
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246 inline Klass* oopDesc::decode_klass_not_null(narrowOop v) { |
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247 assert(!is_null(v), "narrow oop value can never be zero"); |
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248 address base = Universe::narrow_klass_base(); |
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249 int shift = Universe::narrow_klass_shift(); |
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250 Klass* result = (Klass*)(void*)((uintptr_t)base + ((uintptr_t)v << shift)); |
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251 assert(check_klass_alignment(result), err_msg("address not aligned: " PTR_FORMAT, (void*) result)); |
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252 return result; |
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253 } |
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254 |
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255 inline Klass* oopDesc::decode_klass(narrowOop v) { |
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256 return is_null(v) ? (Klass*)NULL : decode_klass_not_null(v); |
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257 } |
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258 |
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259 // Load an oop out of the Java heap as is without decoding. |
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260 // Called by GC to check for null before decoding. |
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261 inline oop oopDesc::load_heap_oop(oop* p) { return *p; } |
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262 inline narrowOop oopDesc::load_heap_oop(narrowOop* p) { return *p; } |
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263 |
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264 // Load and decode an oop out of the Java heap into a wide oop. |
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265 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p) { return *p; } |
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266 inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) { |
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267 return decode_heap_oop_not_null(*p); |
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268 } |
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269 |
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270 // Load and decode an oop out of the heap accepting null |
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271 inline oop oopDesc::load_decode_heap_oop(oop* p) { return *p; } |
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272 inline oop oopDesc::load_decode_heap_oop(narrowOop* p) { |
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273 return decode_heap_oop(*p); |
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274 } |
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275 |
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276 // Store already encoded heap oop into the heap. |
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277 inline void oopDesc::store_heap_oop(oop* p, oop v) { *p = v; } |
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278 inline void oopDesc::store_heap_oop(narrowOop* p, narrowOop v) { *p = v; } |
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279 |
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280 // Encode and store a heap oop. |
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281 inline void oopDesc::encode_store_heap_oop_not_null(narrowOop* p, oop v) { |
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282 *p = encode_heap_oop_not_null(v); |
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283 } |
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284 inline void oopDesc::encode_store_heap_oop_not_null(oop* p, oop v) { *p = v; } |
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285 |
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286 // Encode and store a heap oop allowing for null. |
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287 inline void oopDesc::encode_store_heap_oop(narrowOop* p, oop v) { |
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288 *p = encode_heap_oop(v); |
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289 } |
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290 inline void oopDesc::encode_store_heap_oop(oop* p, oop v) { *p = v; } |
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291 |
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292 // Store heap oop as is for volatile fields. |
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293 inline void oopDesc::release_store_heap_oop(volatile oop* p, oop v) { |
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294 OrderAccess::release_store_ptr(p, v); |
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295 } |
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296 inline void oopDesc::release_store_heap_oop(volatile narrowOop* p, |
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297 narrowOop v) { |
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298 OrderAccess::release_store(p, v); |
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299 } |
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300 |
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301 inline void oopDesc::release_encode_store_heap_oop_not_null( |
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302 volatile narrowOop* p, oop v) { |
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303 // heap oop is not pointer sized. |
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304 OrderAccess::release_store(p, encode_heap_oop_not_null(v)); |
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305 } |
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306 |
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307 inline void oopDesc::release_encode_store_heap_oop_not_null( |
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308 volatile oop* p, oop v) { |
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309 OrderAccess::release_store_ptr(p, v); |
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310 } |
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311 |
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312 inline void oopDesc::release_encode_store_heap_oop(volatile oop* p, |
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313 oop v) { |
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314 OrderAccess::release_store_ptr(p, v); |
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315 } |
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316 inline void oopDesc::release_encode_store_heap_oop( |
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317 volatile narrowOop* p, oop v) { |
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318 OrderAccess::release_store(p, encode_heap_oop(v)); |
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319 } |
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320 |
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321 |
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322 // These functions are only used to exchange oop fields in instances, |
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323 // not headers. |
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324 inline oop oopDesc::atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest) { |
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325 if (UseCompressedOops) { |
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326 // encode exchange value from oop to T |
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327 narrowOop val = encode_heap_oop(exchange_value); |
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328 narrowOop old = (narrowOop)Atomic::xchg(val, (narrowOop*)dest); |
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329 // decode old from T to oop |
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330 return decode_heap_oop(old); |
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331 } else { |
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332 return (oop)Atomic::xchg_ptr(exchange_value, (oop*)dest); |
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333 } |
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334 } |
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335 |
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336 // In order to put or get a field out of an instance, must first check |
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337 // if the field has been compressed and uncompress it. |
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338 inline oop oopDesc::obj_field(int offset) const { |
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339 return UseCompressedOops ? |
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340 load_decode_heap_oop(obj_field_addr<narrowOop>(offset)) : |
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341 load_decode_heap_oop(obj_field_addr<oop>(offset)); |
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342 } |
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343 inline volatile oop oopDesc::obj_field_volatile(int offset) const { |
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344 volatile oop value = obj_field(offset); |
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345 OrderAccess::acquire(); |
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346 return value; |
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347 } |
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348 inline void oopDesc::obj_field_put(int offset, oop value) { |
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349 UseCompressedOops ? oop_store(obj_field_addr<narrowOop>(offset), value) : |
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350 oop_store(obj_field_addr<oop>(offset), value); |
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351 } |
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352 |
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353 inline Metadata* oopDesc::metadata_field(int offset) const { |
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354 return *metadata_field_addr(offset); |
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355 } |
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356 |
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357 inline void oopDesc::metadata_field_put(int offset, Metadata* value) { |
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358 *metadata_field_addr(offset) = value; |
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359 } |
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360 |
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361 inline void oopDesc::obj_field_put_raw(int offset, oop value) { |
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362 UseCompressedOops ? |
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363 encode_store_heap_oop(obj_field_addr<narrowOop>(offset), value) : |
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364 encode_store_heap_oop(obj_field_addr<oop>(offset), value); |
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365 } |
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366 inline void oopDesc::obj_field_put_volatile(int offset, oop value) { |
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367 OrderAccess::release(); |
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368 obj_field_put(offset, value); |
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369 OrderAccess::fence(); |
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370 } |
0 | 371 |
372 inline jbyte oopDesc::byte_field(int offset) const { return (jbyte) *byte_field_addr(offset); } | |
373 inline void oopDesc::byte_field_put(int offset, jbyte contents) { *byte_field_addr(offset) = (jint) contents; } | |
374 | |
375 inline jboolean oopDesc::bool_field(int offset) const { return (jboolean) *bool_field_addr(offset); } | |
376 inline void oopDesc::bool_field_put(int offset, jboolean contents) { *bool_field_addr(offset) = (jint) contents; } | |
377 | |
378 inline jchar oopDesc::char_field(int offset) const { return (jchar) *char_field_addr(offset); } | |
379 inline void oopDesc::char_field_put(int offset, jchar contents) { *char_field_addr(offset) = (jint) contents; } | |
380 | |
381 inline jint oopDesc::int_field(int offset) const { return *int_field_addr(offset); } | |
382 inline void oopDesc::int_field_put(int offset, jint contents) { *int_field_addr(offset) = contents; } | |
383 | |
384 inline jshort oopDesc::short_field(int offset) const { return (jshort) *short_field_addr(offset); } | |
385 inline void oopDesc::short_field_put(int offset, jshort contents) { *short_field_addr(offset) = (jint) contents;} | |
386 | |
387 inline jlong oopDesc::long_field(int offset) const { return *long_field_addr(offset); } | |
388 inline void oopDesc::long_field_put(int offset, jlong contents) { *long_field_addr(offset) = contents; } | |
389 | |
390 inline jfloat oopDesc::float_field(int offset) const { return *float_field_addr(offset); } | |
391 inline void oopDesc::float_field_put(int offset, jfloat contents) { *float_field_addr(offset) = contents; } | |
392 | |
393 inline jdouble oopDesc::double_field(int offset) const { return *double_field_addr(offset); } | |
394 inline void oopDesc::double_field_put(int offset, jdouble contents) { *double_field_addr(offset) = contents; } | |
395 | |
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396 inline address oopDesc::address_field(int offset) const { return *address_field_addr(offset); } |
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397 inline void oopDesc::address_field_put(int offset, address contents) { *address_field_addr(offset) = contents; } |
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398 |
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399 inline oop oopDesc::obj_field_acquire(int offset) const { |
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400 return UseCompressedOops ? |
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401 decode_heap_oop((narrowOop) |
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402 OrderAccess::load_acquire(obj_field_addr<narrowOop>(offset))) |
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403 : decode_heap_oop((oop) |
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404 OrderAccess::load_ptr_acquire(obj_field_addr<oop>(offset))); |
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405 } |
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406 inline void oopDesc::release_obj_field_put(int offset, oop value) { |
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407 UseCompressedOops ? |
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408 oop_store((volatile narrowOop*)obj_field_addr<narrowOop>(offset), value) : |
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409 oop_store((volatile oop*) obj_field_addr<oop>(offset), value); |
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410 } |
0 | 411 |
412 inline jbyte oopDesc::byte_field_acquire(int offset) const { return OrderAccess::load_acquire(byte_field_addr(offset)); } | |
413 inline void oopDesc::release_byte_field_put(int offset, jbyte contents) { OrderAccess::release_store(byte_field_addr(offset), contents); } | |
414 | |
415 inline jboolean oopDesc::bool_field_acquire(int offset) const { return OrderAccess::load_acquire(bool_field_addr(offset)); } | |
416 inline void oopDesc::release_bool_field_put(int offset, jboolean contents) { OrderAccess::release_store(bool_field_addr(offset), contents); } | |
417 | |
418 inline jchar oopDesc::char_field_acquire(int offset) const { return OrderAccess::load_acquire(char_field_addr(offset)); } | |
419 inline void oopDesc::release_char_field_put(int offset, jchar contents) { OrderAccess::release_store(char_field_addr(offset), contents); } | |
420 | |
421 inline jint oopDesc::int_field_acquire(int offset) const { return OrderAccess::load_acquire(int_field_addr(offset)); } | |
422 inline void oopDesc::release_int_field_put(int offset, jint contents) { OrderAccess::release_store(int_field_addr(offset), contents); } | |
423 | |
424 inline jshort oopDesc::short_field_acquire(int offset) const { return (jshort)OrderAccess::load_acquire(short_field_addr(offset)); } | |
425 inline void oopDesc::release_short_field_put(int offset, jshort contents) { OrderAccess::release_store(short_field_addr(offset), contents); } | |
426 | |
427 inline jlong oopDesc::long_field_acquire(int offset) const { return OrderAccess::load_acquire(long_field_addr(offset)); } | |
428 inline void oopDesc::release_long_field_put(int offset, jlong contents) { OrderAccess::release_store(long_field_addr(offset), contents); } | |
429 | |
430 inline jfloat oopDesc::float_field_acquire(int offset) const { return OrderAccess::load_acquire(float_field_addr(offset)); } | |
431 inline void oopDesc::release_float_field_put(int offset, jfloat contents) { OrderAccess::release_store(float_field_addr(offset), contents); } | |
432 | |
433 inline jdouble oopDesc::double_field_acquire(int offset) const { return OrderAccess::load_acquire(double_field_addr(offset)); } | |
434 inline void oopDesc::release_double_field_put(int offset, jdouble contents) { OrderAccess::release_store(double_field_addr(offset), contents); } | |
435 | |
710 | 436 inline address oopDesc::address_field_acquire(int offset) const { return (address) OrderAccess::load_ptr_acquire(address_field_addr(offset)); } |
437 inline void oopDesc::release_address_field_put(int offset, address contents) { OrderAccess::release_store_ptr(address_field_addr(offset), contents); } | |
438 | |
0 | 439 inline int oopDesc::size_given_klass(Klass* klass) { |
440 int lh = klass->layout_helper(); | |
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441 int s; |
0 | 442 |
443 // lh is now a value computed at class initialization that may hint | |
444 // at the size. For instances, this is positive and equal to the | |
445 // size. For arrays, this is negative and provides log2 of the | |
446 // array element size. For other oops, it is zero and thus requires | |
447 // a virtual call. | |
448 // | |
449 // We go to all this trouble because the size computation is at the | |
450 // heart of phase 2 of mark-compaction, and called for every object, | |
451 // alive or dead. So the speed here is equal in importance to the | |
452 // speed of allocation. | |
453 | |
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454 if (lh > Klass::_lh_neutral_value) { |
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455 if (!Klass::layout_helper_needs_slow_path(lh)) { |
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456 s = lh >> LogHeapWordSize; // deliver size scaled by wordSize |
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457 } else { |
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458 s = klass->oop_size(this); |
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459 } |
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460 } else if (lh <= Klass::_lh_neutral_value) { |
0 | 461 // The most common case is instances; fall through if so. |
462 if (lh < Klass::_lh_neutral_value) { | |
463 // Second most common case is arrays. We have to fetch the | |
464 // length of the array, shift (multiply) it appropriately, | |
465 // up to wordSize, add the header, and align to object size. | |
466 size_t size_in_bytes; | |
467 #ifdef _M_IA64 | |
468 // The Windows Itanium Aug 2002 SDK hoists this load above | |
469 // the check for s < 0. An oop at the end of the heap will | |
470 // cause an access violation if this load is performed on a non | |
471 // array oop. Making the reference volatile prohibits this. | |
472 // (%%% please explain by what magic the length is actually fetched!) | |
473 volatile int *array_length; | |
474 array_length = (volatile int *)( (intptr_t)this + | |
475 arrayOopDesc::length_offset_in_bytes() ); | |
476 assert(array_length > 0, "Integer arithmetic problem somewhere"); | |
477 // Put into size_t to avoid overflow. | |
478 size_in_bytes = (size_t) array_length; | |
479 size_in_bytes = size_in_bytes << Klass::layout_helper_log2_element_size(lh); | |
480 #else | |
481 size_t array_length = (size_t) ((arrayOop)this)->length(); | |
482 size_in_bytes = array_length << Klass::layout_helper_log2_element_size(lh); | |
483 #endif | |
484 size_in_bytes += Klass::layout_helper_header_size(lh); | |
485 | |
486 // This code could be simplified, but by keeping array_header_in_bytes | |
487 // in units of bytes and doing it this way we can round up just once, | |
488 // skipping the intermediate round to HeapWordSize. Cast the result | |
489 // of round_to to size_t to guarantee unsigned division == right shift. | |
490 s = (int)((size_t)round_to(size_in_bytes, MinObjAlignmentInBytes) / | |
491 HeapWordSize); | |
492 | |
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493 // UseParNewGC, UseParallelGC and UseG1GC can change the length field |
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494 // of an "old copy" of an object array in the young gen so it indicates |
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495 // the grey portion of an already copied array. This will cause the first |
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496 // disjunct below to fail if the two comparands are computed across such |
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497 // a concurrent change. |
0 | 498 // UseParNewGC also runs with promotion labs (which look like int |
499 // filler arrays) which are subject to changing their declared size | |
500 // when finally retiring a PLAB; this also can cause the first disjunct | |
501 // to fail for another worker thread that is concurrently walking the block | |
502 // offset table. Both these invariant failures are benign for their | |
503 // current uses; we relax the assertion checking to cover these two cases below: | |
504 // is_objArray() && is_forwarded() // covers first scenario above | |
505 // || is_typeArray() // covers second scenario above | |
506 // If and when UseParallelGC uses the same obj array oop stealing/chunking | |
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507 // technique, we will need to suitably modify the assertion. |
0 | 508 assert((s == klass->oop_size(this)) || |
342
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509 (Universe::heap()->is_gc_active() && |
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510 ((is_typeArray() && UseParNewGC) || |
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511 (is_objArray() && is_forwarded() && (UseParNewGC || UseParallelGC || UseG1GC)))), |
0 | 512 "wrong array object size"); |
513 } else { | |
514 // Must be zero, so bite the bullet and take the virtual call. | |
515 s = klass->oop_size(this); | |
516 } | |
517 } | |
518 | |
519 assert(s % MinObjAlignment == 0, "alignment check"); | |
520 assert(s > 0, "Bad size calculated"); | |
521 return s; | |
522 } | |
523 | |
524 | |
525 inline int oopDesc::size() { | |
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526 return size_given_klass(klass()); |
518
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527 } |
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528 |
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529 inline void update_barrier_set(void* p, oop v) { |
0 | 530 assert(oopDesc::bs() != NULL, "Uninitialized bs in oop!"); |
531 oopDesc::bs()->write_ref_field(p, v); | |
532 } | |
533 | |
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534 template <class T> inline void update_barrier_set_pre(T* p, oop v) { |
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535 oopDesc::bs()->write_ref_field_pre(p, v); |
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536 } |
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537 |
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538 template <class T> inline void oop_store(T* p, oop v) { |
0 | 539 if (always_do_update_barrier) { |
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540 oop_store((volatile T*)p, v); |
0 | 541 } else { |
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542 update_barrier_set_pre(p, v); |
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543 oopDesc::encode_store_heap_oop(p, v); |
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544 update_barrier_set((void*)p, v); // cast away type |
0 | 545 } |
546 } | |
547 | |
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548 template <class T> inline void oop_store(volatile T* p, oop v) { |
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549 update_barrier_set_pre((T*)p, v); // cast away volatile |
0 | 550 // Used by release_obj_field_put, so use release_store_ptr. |
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551 oopDesc::release_encode_store_heap_oop(p, v); |
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552 update_barrier_set((void*)p, v); // cast away type |
0 | 553 } |
554 | |
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555 // Should replace *addr = oop assignments where addr type depends on UseCompressedOops |
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556 // (without having to remember the function name this calls). |
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557 inline void oop_store_raw(HeapWord* addr, oop value) { |
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558 if (UseCompressedOops) { |
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559 oopDesc::encode_store_heap_oop((narrowOop*)addr, value); |
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560 } else { |
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561 oopDesc::encode_store_heap_oop((oop*)addr, value); |
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562 } |
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563 } |
0 | 564 |
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565 inline oop oopDesc::atomic_compare_exchange_oop(oop exchange_value, |
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566 volatile HeapWord *dest, |
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567 oop compare_value, |
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568 bool prebarrier) { |
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569 if (UseCompressedOops) { |
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570 if (prebarrier) { |
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571 update_barrier_set_pre((narrowOop*)dest, exchange_value); |
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572 } |
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573 // encode exchange and compare value from oop to T |
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574 narrowOop val = encode_heap_oop(exchange_value); |
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575 narrowOop cmp = encode_heap_oop(compare_value); |
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576 |
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577 narrowOop old = (narrowOop) Atomic::cmpxchg(val, (narrowOop*)dest, cmp); |
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578 // decode old from T to oop |
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579 return decode_heap_oop(old); |
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580 } else { |
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581 if (prebarrier) { |
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582 update_barrier_set_pre((oop*)dest, exchange_value); |
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583 } |
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584 return (oop)Atomic::cmpxchg_ptr(exchange_value, (oop*)dest, compare_value); |
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585 } |
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586 } |
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587 |
0 | 588 // Used only for markSweep, scavenging |
589 inline bool oopDesc::is_gc_marked() const { | |
590 return mark()->is_marked(); | |
591 } | |
592 | |
593 inline bool oopDesc::is_locked() const { | |
594 return mark()->is_locked(); | |
595 } | |
596 | |
597 inline bool oopDesc::is_unlocked() const { | |
598 return mark()->is_unlocked(); | |
599 } | |
600 | |
601 inline bool oopDesc::has_bias_pattern() const { | |
602 return mark()->has_bias_pattern(); | |
603 } | |
604 | |
605 | |
606 // used only for asserts | |
607 inline bool oopDesc::is_oop(bool ignore_mark_word) const { | |
608 oop obj = (oop) this; | |
609 if (!check_obj_alignment(obj)) return false; | |
610 if (!Universe::heap()->is_in_reserved(obj)) return false; | |
611 // obj is aligned and accessible in heap | |
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612 if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false; |
0 | 613 |
614 // Header verification: the mark is typically non-NULL. If we're | |
615 // at a safepoint, it must not be null. | |
616 // Outside of a safepoint, the header could be changing (for example, | |
617 // another thread could be inflating a lock on this object). | |
618 if (ignore_mark_word) { | |
619 return true; | |
620 } | |
621 if (mark() != NULL) { | |
622 return true; | |
623 } | |
624 return !SafepointSynchronize::is_at_safepoint(); | |
625 } | |
626 | |
627 | |
628 // used only for asserts | |
629 inline bool oopDesc::is_oop_or_null(bool ignore_mark_word) const { | |
630 return this == NULL ? true : is_oop(ignore_mark_word); | |
631 } | |
632 | |
633 #ifndef PRODUCT | |
634 // used only for asserts | |
635 inline bool oopDesc::is_unlocked_oop() const { | |
636 if (!Universe::heap()->is_in_reserved(this)) return false; | |
637 return mark()->is_unlocked(); | |
638 } | |
639 #endif // PRODUCT | |
640 | |
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641 inline void oopDesc::follow_contents(void) { |
0 | 642 assert (is_gc_marked(), "should be marked"); |
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643 klass()->oop_follow_contents(this); |
0 | 644 } |
645 | |
646 // Used by scavengers | |
647 | |
648 inline bool oopDesc::is_forwarded() const { | |
649 // The extra heap check is needed since the obj might be locked, in which case the | |
650 // mark would point to a stack location and have the sentinel bit cleared | |
651 return mark()->is_marked(); | |
652 } | |
653 | |
654 // Used by scavengers | |
655 inline void oopDesc::forward_to(oop p) { | |
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656 assert(check_obj_alignment(p), |
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657 "forwarding to something not aligned"); |
0 | 658 assert(Universe::heap()->is_in_reserved(p), |
659 "forwarding to something not in heap"); | |
660 markOop m = markOopDesc::encode_pointer_as_mark(p); | |
661 assert(m->decode_pointer() == p, "encoding must be reversable"); | |
662 set_mark(m); | |
663 } | |
664 | |
665 // Used by parallel scavengers | |
666 inline bool oopDesc::cas_forward_to(oop p, markOop compare) { | |
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667 assert(check_obj_alignment(p), |
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668 "forwarding to something not aligned"); |
0 | 669 assert(Universe::heap()->is_in_reserved(p), |
670 "forwarding to something not in heap"); | |
671 markOop m = markOopDesc::encode_pointer_as_mark(p); | |
672 assert(m->decode_pointer() == p, "encoding must be reversable"); | |
673 return cas_set_mark(m, compare) == compare; | |
674 } | |
675 | |
676 // Note that the forwardee is not the same thing as the displaced_mark. | |
677 // The forwardee is used when copying during scavenge and mark-sweep. | |
678 // It does need to clear the low two locking- and GC-related bits. | |
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679 inline oop oopDesc::forwardee() const { |
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680 return (oop) mark()->decode_pointer(); |
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681 } |
0 | 682 |
683 inline bool oopDesc::has_displaced_mark() const { | |
684 return mark()->has_displaced_mark_helper(); | |
685 } | |
686 | |
687 inline markOop oopDesc::displaced_mark() const { | |
688 return mark()->displaced_mark_helper(); | |
689 } | |
690 | |
691 inline void oopDesc::set_displaced_mark(markOop m) { | |
692 mark()->set_displaced_mark_helper(m); | |
693 } | |
694 | |
695 // The following method needs to be MT safe. | |
6818 | 696 inline uint oopDesc::age() const { |
0 | 697 assert(!is_forwarded(), "Attempt to read age from forwarded mark"); |
698 if (has_displaced_mark()) { | |
699 return displaced_mark()->age(); | |
700 } else { | |
701 return mark()->age(); | |
702 } | |
703 } | |
704 | |
705 inline void oopDesc::incr_age() { | |
706 assert(!is_forwarded(), "Attempt to increment age of forwarded mark"); | |
707 if (has_displaced_mark()) { | |
708 set_displaced_mark(displaced_mark()->incr_age()); | |
709 } else { | |
710 set_mark(mark()->incr_age()); | |
711 } | |
712 } | |
713 | |
714 | |
715 inline intptr_t oopDesc::identity_hash() { | |
716 // Fast case; if the object is unlocked and the hash value is set, no locking is needed | |
717 // Note: The mark must be read into local variable to avoid concurrent updates. | |
718 markOop mrk = mark(); | |
719 if (mrk->is_unlocked() && !mrk->has_no_hash()) { | |
720 return mrk->hash(); | |
721 } else if (mrk->is_marked()) { | |
722 return mrk->hash(); | |
723 } else { | |
724 return slow_identity_hash(); | |
725 } | |
726 } | |
727 | |
728 inline int oopDesc::adjust_pointers() { | |
729 debug_only(int check_size = size()); | |
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730 int s = klass()->oop_adjust_pointers(this); |
0 | 731 assert(s == check_size, "should be the same"); |
732 return s; | |
733 } | |
734 | |
735 #define OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
736 \ | |
737 inline int oopDesc::oop_iterate(OopClosureType* blk) { \ | |
738 SpecializationStats::record_call(); \ | |
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739 return klass()->oop_oop_iterate##nv_suffix(this, blk); \ |
0 | 740 } \ |
741 \ | |
742 inline int oopDesc::oop_iterate(OopClosureType* blk, MemRegion mr) { \ | |
743 SpecializationStats::record_call(); \ | |
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744 return klass()->oop_oop_iterate##nv_suffix##_m(this, blk, mr); \ |
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745 } |
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746 |
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747 |
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748 inline int oopDesc::oop_iterate_no_header(OopClosure* blk) { |
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749 // The NoHeaderExtendedOopClosure wraps the OopClosure and proxies all |
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750 // the do_oop calls, but turns off all other features in ExtendedOopClosure. |
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751 NoHeaderExtendedOopClosure cl(blk); |
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752 return oop_iterate(&cl); |
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753 } |
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754 |
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755 inline int oopDesc::oop_iterate_no_header(OopClosure* blk, MemRegion mr) { |
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756 NoHeaderExtendedOopClosure cl(blk); |
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757 return oop_iterate(&cl, mr); |
0 | 758 } |
759 | |
760 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DEFN) | |
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761 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DEFN) |
0 | 762 |
342
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763 #ifndef SERIALGC |
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764 #define OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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765 \ |
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766 inline int oopDesc::oop_iterate_backwards(OopClosureType* blk) { \ |
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767 SpecializationStats::record_call(); \ |
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768 return klass()->oop_oop_iterate_backwards##nv_suffix(this, blk); \ |
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769 } |
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770 |
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771 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DEFN) |
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772 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DEFN) |
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773 #endif // !SERIALGC |
0 | 774 |
1972 | 775 #endif // SHARE_VM_OOPS_OOP_INLINE_HPP |