Mercurial > hg > truffle
annotate src/share/vm/oops/oop.inline.hpp @ 12226:7944aba7ba41
8015107: NPG: Use consistent naming for metaspace concepts
Reviewed-by: coleenp, mgerdin, hseigel
| author | ehelin |
|---|---|
| date | Mon, 12 Aug 2013 17:37:02 +0200 |
| parents | 740e263c80c6 |
| children | 190899198332 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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" | |
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38 #include "oops/klass.inline.hpp" |
| 1972 | 39 #include "oops/markOop.inline.hpp" |
| 40 #include "oops/oop.hpp" | |
| 41 #include "runtime/atomic.hpp" | |
| 42 #include "runtime/os.hpp" | |
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43 #include "utilities/macros.hpp" |
| 1972 | 44 #ifdef TARGET_ARCH_x86 |
| 45 # include "bytes_x86.hpp" | |
| 46 #endif | |
| 47 #ifdef TARGET_ARCH_sparc | |
| 48 # include "bytes_sparc.hpp" | |
| 49 #endif | |
| 50 #ifdef TARGET_ARCH_zero | |
| 51 # include "bytes_zero.hpp" | |
| 52 #endif | |
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53 #ifdef TARGET_ARCH_arm |
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54 # include "bytes_arm.hpp" |
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55 #endif |
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56 #ifdef TARGET_ARCH_ppc |
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57 # include "bytes_ppc.hpp" |
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58 #endif |
| 1972 | 59 |
| 0 | 60 // Implementation of all inlined member functions defined in oop.hpp |
| 61 // We need a separate file to avoid circular references | |
| 62 | |
| 63 inline void oopDesc::release_set_mark(markOop m) { | |
| 64 OrderAccess::release_store_ptr(&_mark, m); | |
| 65 } | |
| 66 | |
| 67 inline markOop oopDesc::cas_set_mark(markOop new_mark, markOop old_mark) { | |
| 68 return (markOop) Atomic::cmpxchg_ptr(new_mark, &_mark, old_mark); | |
| 69 } | |
| 70 | |
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71 inline Klass* oopDesc::klass() const { |
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72 if (UseCompressedClassPointers) { |
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73 return Klass::decode_klass_not_null(_metadata._compressed_klass); |
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74 } else { |
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75 return _metadata._klass; |
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76 } |
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77 } |
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78 |
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79 inline Klass* oopDesc::klass_or_null() const volatile { |
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80 // can be NULL in CMS |
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81 if (UseCompressedClassPointers) { |
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82 return Klass::decode_klass(_metadata._compressed_klass); |
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83 } else { |
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84 return _metadata._klass; |
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85 } |
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86 } |
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87 |
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88 inline int oopDesc::klass_gap_offset_in_bytes() { |
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89 assert(UseCompressedClassPointers, "only applicable to compressed klass pointers"); |
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90 return oopDesc::klass_offset_in_bytes() + sizeof(narrowKlass); |
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91 } |
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92 |
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93 inline Klass** oopDesc::klass_addr() { |
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94 // Only used internally and with CMS and will not work with |
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95 // UseCompressedOops |
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96 assert(!UseCompressedClassPointers, "only supported with uncompressed klass pointers"); |
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97 return (Klass**) &_metadata._klass; |
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98 } |
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99 |
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100 inline narrowKlass* oopDesc::compressed_klass_addr() { |
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101 assert(UseCompressedClassPointers, "only called by compressed klass pointers"); |
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102 return &_metadata._compressed_klass; |
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103 } |
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104 |
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105 inline void oopDesc::set_klass(Klass* k) { |
| 0 | 106 // since klasses are promoted no store check is needed |
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107 assert(Universe::is_bootstrapping() || k != NULL, "must be a real Klass*"); |
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108 assert(Universe::is_bootstrapping() || k->is_klass(), "not a Klass*"); |
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109 if (UseCompressedClassPointers) { |
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110 *compressed_klass_addr() = Klass::encode_klass_not_null(k); |
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111 } else { |
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112 *klass_addr() = k; |
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113 } |
| 0 | 114 } |
| 115 | |
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116 inline int oopDesc::klass_gap() const { |
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117 return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()); |
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118 } |
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119 |
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120 inline void oopDesc::set_klass_gap(int v) { |
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121 if (UseCompressedClassPointers) { |
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122 *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()) = v; |
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123 } |
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124 } |
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125 |
| 0 | 126 inline void oopDesc::set_klass_to_list_ptr(oop k) { |
| 127 // This is only to be used during GC, for from-space objects, so no | |
| 128 // barrier is needed. | |
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129 if (UseCompressedClassPointers) { |
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130 _metadata._compressed_klass = (narrowKlass)encode_heap_oop(k); // may be null (parnew overflow handling) |
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131 } else { |
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132 _metadata._klass = (Klass*)(address)k; |
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133 } |
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134 } |
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135 |
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136 inline oop oopDesc::list_ptr_from_klass() { |
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137 // This is only to be used during GC, for from-space objects. |
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138 if (UseCompressedClassPointers) { |
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139 return decode_heap_oop((narrowOop)_metadata._compressed_klass); |
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140 } else { |
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141 // Special case for GC |
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142 return (oop)(address)_metadata._klass; |
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143 } |
| 0 | 144 } |
| 145 | |
| 146 inline void oopDesc::init_mark() { set_mark(markOopDesc::prototype_for_object(this)); } | |
| 147 | |
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148 inline bool oopDesc::is_a(Klass* k) const { return klass()->is_subtype_of(k); } |
| 0 | 149 |
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150 inline bool oopDesc::is_instance() const { return klass()->oop_is_instance(); } |
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151 inline bool oopDesc::is_instanceMirror() const { return klass()->oop_is_instanceMirror(); } |
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152 inline bool oopDesc::is_instanceRef() const { return klass()->oop_is_instanceRef(); } |
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153 inline bool oopDesc::is_array() const { return klass()->oop_is_array(); } |
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154 inline bool oopDesc::is_objArray() const { return klass()->oop_is_objArray(); } |
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155 inline bool oopDesc::is_typeArray() const { return klass()->oop_is_typeArray(); } |
| 0 | 156 |
| 157 inline void* oopDesc::field_base(int offset) const { return (void*)&((char*)this)[offset]; } | |
| 158 | |
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159 template <class T> inline T* oopDesc::obj_field_addr(int offset) const { return (T*)field_base(offset); } |
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160 inline Metadata** oopDesc::metadata_field_addr(int offset) const { return (Metadata**)field_base(offset); } |
| 0 | 161 inline jbyte* oopDesc::byte_field_addr(int offset) const { return (jbyte*) field_base(offset); } |
| 162 inline jchar* oopDesc::char_field_addr(int offset) const { return (jchar*) field_base(offset); } | |
| 163 inline jboolean* oopDesc::bool_field_addr(int offset) const { return (jboolean*)field_base(offset); } | |
| 164 inline jint* oopDesc::int_field_addr(int offset) const { return (jint*) field_base(offset); } | |
| 165 inline jshort* oopDesc::short_field_addr(int offset) const { return (jshort*) field_base(offset); } | |
| 166 inline jlong* oopDesc::long_field_addr(int offset) const { return (jlong*) field_base(offset); } | |
| 167 inline jfloat* oopDesc::float_field_addr(int offset) const { return (jfloat*) field_base(offset); } | |
| 168 inline jdouble* oopDesc::double_field_addr(int offset) const { return (jdouble*) field_base(offset); } | |
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169 inline address* oopDesc::address_field_addr(int offset) const { return (address*) field_base(offset); } |
| 0 | 170 |
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171 |
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172 // Functions for getting and setting oops within instance objects. |
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173 // If the oops are compressed, the type passed to these overloaded functions |
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174 // is narrowOop. All functions are overloaded so they can be called by |
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175 // template functions without conditionals (the compiler instantiates via |
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176 // the right type and inlines the appopriate code). |
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177 |
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178 inline bool oopDesc::is_null(oop 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 |
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189 inline narrowOop oopDesc::encode_heap_oop_not_null(oop v) { |
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190 assert(!is_null(v), "oop value can never be zero"); |
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191 assert(check_obj_alignment(v), "Address not aligned"); |
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192 assert(Universe::heap()->is_in_reserved(v), "Address not in heap"); |
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193 address base = Universe::narrow_oop_base(); |
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194 int shift = Universe::narrow_oop_shift(); |
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195 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1)); |
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196 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding"); |
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197 uint64_t result = pd >> shift; |
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198 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow"); |
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199 assert(decode_heap_oop(result) == v, "reversibility"); |
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200 return (narrowOop)result; |
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201 } |
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202 |
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203 inline narrowOop oopDesc::encode_heap_oop(oop v) { |
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204 return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v); |
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205 } |
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206 |
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207 inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) { |
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208 assert(!is_null(v), "narrow oop value can never be zero"); |
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209 address base = Universe::narrow_oop_base(); |
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210 int shift = Universe::narrow_oop_shift(); |
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211 oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift)); |
| 1846 | 212 assert(check_obj_alignment(result), err_msg("address not aligned: " PTR_FORMAT, (void*) result)); |
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213 return result; |
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214 } |
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215 |
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216 inline oop oopDesc::decode_heap_oop(narrowOop v) { |
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217 return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v); |
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218 } |
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219 |
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220 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; } |
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221 inline oop oopDesc::decode_heap_oop(oop v) { return v; } |
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222 |
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223 // Load an oop out of the Java heap as is without decoding. |
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224 // Called by GC to check for null before decoding. |
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225 inline oop oopDesc::load_heap_oop(oop* p) { return *p; } |
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226 inline narrowOop oopDesc::load_heap_oop(narrowOop* p) { return *p; } |
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227 |
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228 // Load and decode an oop out of the Java heap into a wide oop. |
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229 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p) { return *p; } |
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230 inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) { |
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231 return decode_heap_oop_not_null(*p); |
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232 } |
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233 |
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234 // Load and decode an oop out of the heap accepting null |
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235 inline oop oopDesc::load_decode_heap_oop(oop* p) { return *p; } |
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236 inline oop oopDesc::load_decode_heap_oop(narrowOop* p) { |
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237 return decode_heap_oop(*p); |
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238 } |
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239 |
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240 // Store already encoded heap oop into the heap. |
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241 inline void oopDesc::store_heap_oop(oop* p, oop v) { *p = v; } |
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242 inline void oopDesc::store_heap_oop(narrowOop* p, narrowOop v) { *p = v; } |
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243 |
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244 // Encode and store a heap oop. |
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245 inline void oopDesc::encode_store_heap_oop_not_null(narrowOop* p, oop v) { |
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246 *p = encode_heap_oop_not_null(v); |
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247 } |
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248 inline void oopDesc::encode_store_heap_oop_not_null(oop* p, oop v) { *p = v; } |
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249 |
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250 // Encode and store a heap oop allowing for null. |
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251 inline void oopDesc::encode_store_heap_oop(narrowOop* p, oop v) { |
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252 *p = encode_heap_oop(v); |
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253 } |
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254 inline void oopDesc::encode_store_heap_oop(oop* p, oop v) { *p = v; } |
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255 |
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256 // Store heap oop as is for volatile fields. |
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257 inline void oopDesc::release_store_heap_oop(volatile oop* p, oop v) { |
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258 OrderAccess::release_store_ptr(p, v); |
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259 } |
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260 inline void oopDesc::release_store_heap_oop(volatile narrowOop* p, |
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261 narrowOop v) { |
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262 OrderAccess::release_store(p, v); |
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263 } |
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264 |
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265 inline void oopDesc::release_encode_store_heap_oop_not_null( |
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266 volatile narrowOop* p, oop v) { |
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267 // heap oop is not pointer sized. |
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268 OrderAccess::release_store(p, encode_heap_oop_not_null(v)); |
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269 } |
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270 |
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271 inline void oopDesc::release_encode_store_heap_oop_not_null( |
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272 volatile oop* p, oop v) { |
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273 OrderAccess::release_store_ptr(p, v); |
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274 } |
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275 |
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276 inline void oopDesc::release_encode_store_heap_oop(volatile oop* p, |
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277 oop v) { |
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278 OrderAccess::release_store_ptr(p, v); |
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279 } |
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280 inline void oopDesc::release_encode_store_heap_oop( |
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281 volatile narrowOop* p, oop v) { |
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282 OrderAccess::release_store(p, encode_heap_oop(v)); |
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283 } |
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284 |
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285 |
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286 // These functions are only used to exchange oop fields in instances, |
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287 // not headers. |
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288 inline oop oopDesc::atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest) { |
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289 if (UseCompressedOops) { |
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290 // encode exchange value from oop to T |
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291 narrowOop val = encode_heap_oop(exchange_value); |
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292 narrowOop old = (narrowOop)Atomic::xchg(val, (narrowOop*)dest); |
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293 // decode old from T to oop |
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294 return decode_heap_oop(old); |
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295 } else { |
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296 return (oop)Atomic::xchg_ptr(exchange_value, (oop*)dest); |
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297 } |
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298 } |
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299 |
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300 // In order to put or get a field out of an instance, must first check |
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301 // if the field has been compressed and uncompress it. |
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302 inline oop oopDesc::obj_field(int offset) const { |
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303 return UseCompressedOops ? |
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304 load_decode_heap_oop(obj_field_addr<narrowOop>(offset)) : |
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305 load_decode_heap_oop(obj_field_addr<oop>(offset)); |
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306 } |
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307 inline volatile oop oopDesc::obj_field_volatile(int offset) const { |
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308 volatile oop value = obj_field(offset); |
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309 OrderAccess::acquire(); |
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310 return value; |
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311 } |
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312 inline void oopDesc::obj_field_put(int offset, oop value) { |
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313 UseCompressedOops ? oop_store(obj_field_addr<narrowOop>(offset), value) : |
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314 oop_store(obj_field_addr<oop>(offset), value); |
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315 } |
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316 |
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317 inline Metadata* oopDesc::metadata_field(int offset) const { |
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318 return *metadata_field_addr(offset); |
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319 } |
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320 |
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321 inline void oopDesc::metadata_field_put(int offset, Metadata* value) { |
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322 *metadata_field_addr(offset) = value; |
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323 } |
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324 |
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325 inline void oopDesc::obj_field_put_raw(int offset, oop value) { |
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326 UseCompressedOops ? |
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327 encode_store_heap_oop(obj_field_addr<narrowOop>(offset), value) : |
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328 encode_store_heap_oop(obj_field_addr<oop>(offset), value); |
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329 } |
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330 inline void oopDesc::obj_field_put_volatile(int offset, oop value) { |
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331 OrderAccess::release(); |
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332 obj_field_put(offset, value); |
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333 OrderAccess::fence(); |
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334 } |
| 0 | 335 |
| 336 inline jbyte oopDesc::byte_field(int offset) const { return (jbyte) *byte_field_addr(offset); } | |
| 337 inline void oopDesc::byte_field_put(int offset, jbyte contents) { *byte_field_addr(offset) = (jint) contents; } | |
| 338 | |
| 339 inline jboolean oopDesc::bool_field(int offset) const { return (jboolean) *bool_field_addr(offset); } | |
| 340 inline void oopDesc::bool_field_put(int offset, jboolean contents) { *bool_field_addr(offset) = (jint) contents; } | |
| 341 | |
| 342 inline jchar oopDesc::char_field(int offset) const { return (jchar) *char_field_addr(offset); } | |
| 343 inline void oopDesc::char_field_put(int offset, jchar contents) { *char_field_addr(offset) = (jint) contents; } | |
| 344 | |
| 345 inline jint oopDesc::int_field(int offset) const { return *int_field_addr(offset); } | |
| 346 inline void oopDesc::int_field_put(int offset, jint contents) { *int_field_addr(offset) = contents; } | |
| 347 | |
| 348 inline jshort oopDesc::short_field(int offset) const { return (jshort) *short_field_addr(offset); } | |
| 349 inline void oopDesc::short_field_put(int offset, jshort contents) { *short_field_addr(offset) = (jint) contents;} | |
| 350 | |
| 351 inline jlong oopDesc::long_field(int offset) const { return *long_field_addr(offset); } | |
| 352 inline void oopDesc::long_field_put(int offset, jlong contents) { *long_field_addr(offset) = contents; } | |
| 353 | |
| 354 inline jfloat oopDesc::float_field(int offset) const { return *float_field_addr(offset); } | |
| 355 inline void oopDesc::float_field_put(int offset, jfloat contents) { *float_field_addr(offset) = contents; } | |
| 356 | |
| 357 inline jdouble oopDesc::double_field(int offset) const { return *double_field_addr(offset); } | |
| 358 inline void oopDesc::double_field_put(int offset, jdouble contents) { *double_field_addr(offset) = contents; } | |
| 359 | |
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360 inline address oopDesc::address_field(int offset) const { return *address_field_addr(offset); } |
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361 inline void oopDesc::address_field_put(int offset, address contents) { *address_field_addr(offset) = contents; } |
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362 |
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363 inline oop oopDesc::obj_field_acquire(int offset) const { |
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364 return UseCompressedOops ? |
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365 decode_heap_oop((narrowOop) |
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366 OrderAccess::load_acquire(obj_field_addr<narrowOop>(offset))) |
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367 : decode_heap_oop((oop) |
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368 OrderAccess::load_ptr_acquire(obj_field_addr<oop>(offset))); |
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369 } |
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370 inline void oopDesc::release_obj_field_put(int offset, oop value) { |
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371 UseCompressedOops ? |
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372 oop_store((volatile narrowOop*)obj_field_addr<narrowOop>(offset), value) : |
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373 oop_store((volatile oop*) obj_field_addr<oop>(offset), value); |
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374 } |
| 0 | 375 |
| 376 inline jbyte oopDesc::byte_field_acquire(int offset) const { return OrderAccess::load_acquire(byte_field_addr(offset)); } | |
| 377 inline void oopDesc::release_byte_field_put(int offset, jbyte contents) { OrderAccess::release_store(byte_field_addr(offset), contents); } | |
| 378 | |
| 379 inline jboolean oopDesc::bool_field_acquire(int offset) const { return OrderAccess::load_acquire(bool_field_addr(offset)); } | |
| 380 inline void oopDesc::release_bool_field_put(int offset, jboolean contents) { OrderAccess::release_store(bool_field_addr(offset), contents); } | |
| 381 | |
| 382 inline jchar oopDesc::char_field_acquire(int offset) const { return OrderAccess::load_acquire(char_field_addr(offset)); } | |
| 383 inline void oopDesc::release_char_field_put(int offset, jchar contents) { OrderAccess::release_store(char_field_addr(offset), contents); } | |
| 384 | |
| 385 inline jint oopDesc::int_field_acquire(int offset) const { return OrderAccess::load_acquire(int_field_addr(offset)); } | |
| 386 inline void oopDesc::release_int_field_put(int offset, jint contents) { OrderAccess::release_store(int_field_addr(offset), contents); } | |
| 387 | |
| 388 inline jshort oopDesc::short_field_acquire(int offset) const { return (jshort)OrderAccess::load_acquire(short_field_addr(offset)); } | |
| 389 inline void oopDesc::release_short_field_put(int offset, jshort contents) { OrderAccess::release_store(short_field_addr(offset), contents); } | |
| 390 | |
| 391 inline jlong oopDesc::long_field_acquire(int offset) const { return OrderAccess::load_acquire(long_field_addr(offset)); } | |
| 392 inline void oopDesc::release_long_field_put(int offset, jlong contents) { OrderAccess::release_store(long_field_addr(offset), contents); } | |
| 393 | |
| 394 inline jfloat oopDesc::float_field_acquire(int offset) const { return OrderAccess::load_acquire(float_field_addr(offset)); } | |
| 395 inline void oopDesc::release_float_field_put(int offset, jfloat contents) { OrderAccess::release_store(float_field_addr(offset), contents); } | |
| 396 | |
| 397 inline jdouble oopDesc::double_field_acquire(int offset) const { return OrderAccess::load_acquire(double_field_addr(offset)); } | |
| 398 inline void oopDesc::release_double_field_put(int offset, jdouble contents) { OrderAccess::release_store(double_field_addr(offset), contents); } | |
| 399 | |
| 710 | 400 inline address oopDesc::address_field_acquire(int offset) const { return (address) OrderAccess::load_ptr_acquire(address_field_addr(offset)); } |
| 401 inline void oopDesc::release_address_field_put(int offset, address contents) { OrderAccess::release_store_ptr(address_field_addr(offset), contents); } | |
| 402 | |
| 0 | 403 inline int oopDesc::size_given_klass(Klass* klass) { |
| 404 int lh = klass->layout_helper(); | |
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405 int s; |
| 0 | 406 |
| 407 // lh is now a value computed at class initialization that may hint | |
| 408 // at the size. For instances, this is positive and equal to the | |
| 409 // size. For arrays, this is negative and provides log2 of the | |
| 410 // array element size. For other oops, it is zero and thus requires | |
| 411 // a virtual call. | |
| 412 // | |
| 413 // We go to all this trouble because the size computation is at the | |
| 414 // heart of phase 2 of mark-compaction, and called for every object, | |
| 415 // alive or dead. So the speed here is equal in importance to the | |
| 416 // speed of allocation. | |
| 417 | |
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418 if (lh > Klass::_lh_neutral_value) { |
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419 if (!Klass::layout_helper_needs_slow_path(lh)) { |
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420 s = lh >> LogHeapWordSize; // deliver size scaled by wordSize |
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421 } else { |
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422 s = klass->oop_size(this); |
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423 } |
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424 } else if (lh <= Klass::_lh_neutral_value) { |
| 0 | 425 // The most common case is instances; fall through if so. |
| 426 if (lh < Klass::_lh_neutral_value) { | |
| 427 // Second most common case is arrays. We have to fetch the | |
| 428 // length of the array, shift (multiply) it appropriately, | |
| 429 // up to wordSize, add the header, and align to object size. | |
| 430 size_t size_in_bytes; | |
| 431 #ifdef _M_IA64 | |
| 432 // The Windows Itanium Aug 2002 SDK hoists this load above | |
| 433 // the check for s < 0. An oop at the end of the heap will | |
| 434 // cause an access violation if this load is performed on a non | |
| 435 // array oop. Making the reference volatile prohibits this. | |
| 436 // (%%% please explain by what magic the length is actually fetched!) | |
| 437 volatile int *array_length; | |
| 438 array_length = (volatile int *)( (intptr_t)this + | |
| 439 arrayOopDesc::length_offset_in_bytes() ); | |
| 440 assert(array_length > 0, "Integer arithmetic problem somewhere"); | |
| 441 // Put into size_t to avoid overflow. | |
| 442 size_in_bytes = (size_t) array_length; | |
| 443 size_in_bytes = size_in_bytes << Klass::layout_helper_log2_element_size(lh); | |
| 444 #else | |
| 445 size_t array_length = (size_t) ((arrayOop)this)->length(); | |
| 446 size_in_bytes = array_length << Klass::layout_helper_log2_element_size(lh); | |
| 447 #endif | |
| 448 size_in_bytes += Klass::layout_helper_header_size(lh); | |
| 449 | |
| 450 // This code could be simplified, but by keeping array_header_in_bytes | |
| 451 // in units of bytes and doing it this way we can round up just once, | |
| 452 // skipping the intermediate round to HeapWordSize. Cast the result | |
| 453 // of round_to to size_t to guarantee unsigned division == right shift. | |
| 454 s = (int)((size_t)round_to(size_in_bytes, MinObjAlignmentInBytes) / | |
| 455 HeapWordSize); | |
| 456 | |
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457 // UseParNewGC, UseParallelGC and UseG1GC can change the length field |
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458 // of an "old copy" of an object array in the young gen so it indicates |
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459 // the grey portion of an already copied array. This will cause the first |
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460 // disjunct below to fail if the two comparands are computed across such |
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461 // a concurrent change. |
| 0 | 462 // UseParNewGC also runs with promotion labs (which look like int |
| 463 // filler arrays) which are subject to changing their declared size | |
| 464 // when finally retiring a PLAB; this also can cause the first disjunct | |
| 465 // to fail for another worker thread that is concurrently walking the block | |
| 466 // offset table. Both these invariant failures are benign for their | |
| 467 // current uses; we relax the assertion checking to cover these two cases below: | |
| 468 // is_objArray() && is_forwarded() // covers first scenario above | |
| 469 // || is_typeArray() // covers second scenario above | |
| 470 // If and when UseParallelGC uses the same obj array oop stealing/chunking | |
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471 // technique, we will need to suitably modify the assertion. |
| 0 | 472 assert((s == klass->oop_size(this)) || |
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473 (Universe::heap()->is_gc_active() && |
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474 ((is_typeArray() && UseParNewGC) || |
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475 (is_objArray() && is_forwarded() && (UseParNewGC || UseParallelGC || UseG1GC)))), |
| 0 | 476 "wrong array object size"); |
| 477 } else { | |
| 478 // Must be zero, so bite the bullet and take the virtual call. | |
| 479 s = klass->oop_size(this); | |
| 480 } | |
| 481 } | |
| 482 | |
| 483 assert(s % MinObjAlignment == 0, "alignment check"); | |
| 484 assert(s > 0, "Bad size calculated"); | |
| 485 return s; | |
| 486 } | |
| 487 | |
| 488 | |
| 489 inline int oopDesc::size() { | |
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490 return size_given_klass(klass()); |
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491 } |
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492 |
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493 inline void update_barrier_set(void* p, oop v) { |
| 0 | 494 assert(oopDesc::bs() != NULL, "Uninitialized bs in oop!"); |
| 495 oopDesc::bs()->write_ref_field(p, v); | |
| 496 } | |
| 497 | |
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498 template <class T> inline void update_barrier_set_pre(T* p, oop v) { |
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499 oopDesc::bs()->write_ref_field_pre(p, v); |
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500 } |
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501 |
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502 template <class T> inline void oop_store(T* p, oop v) { |
| 0 | 503 if (always_do_update_barrier) { |
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504 oop_store((volatile T*)p, v); |
| 0 | 505 } else { |
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506 update_barrier_set_pre(p, v); |
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507 oopDesc::encode_store_heap_oop(p, v); |
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508 update_barrier_set((void*)p, v); // cast away type |
| 0 | 509 } |
| 510 } | |
| 511 | |
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512 template <class T> inline void oop_store(volatile T* p, oop v) { |
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513 update_barrier_set_pre((T*)p, v); // cast away volatile |
| 0 | 514 // Used by release_obj_field_put, so use release_store_ptr. |
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515 oopDesc::release_encode_store_heap_oop(p, v); |
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516 update_barrier_set((void*)p, v); // cast away type |
| 0 | 517 } |
| 518 | |
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519 // Should replace *addr = oop assignments where addr type depends on UseCompressedOops |
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520 // (without having to remember the function name this calls). |
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521 inline void oop_store_raw(HeapWord* addr, oop value) { |
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522 if (UseCompressedOops) { |
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523 oopDesc::encode_store_heap_oop((narrowOop*)addr, value); |
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524 } else { |
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525 oopDesc::encode_store_heap_oop((oop*)addr, value); |
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526 } |
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527 } |
| 0 | 528 |
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529 inline oop oopDesc::atomic_compare_exchange_oop(oop exchange_value, |
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530 volatile HeapWord *dest, |
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531 oop compare_value, |
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532 bool prebarrier) { |
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533 if (UseCompressedOops) { |
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534 if (prebarrier) { |
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535 update_barrier_set_pre((narrowOop*)dest, exchange_value); |
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536 } |
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537 // encode exchange and compare value from oop to T |
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538 narrowOop val = encode_heap_oop(exchange_value); |
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539 narrowOop cmp = encode_heap_oop(compare_value); |
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540 |
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541 narrowOop old = (narrowOop) Atomic::cmpxchg(val, (narrowOop*)dest, cmp); |
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542 // decode old from T to oop |
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543 return decode_heap_oop(old); |
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544 } else { |
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545 if (prebarrier) { |
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546 update_barrier_set_pre((oop*)dest, exchange_value); |
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547 } |
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548 return (oop)Atomic::cmpxchg_ptr(exchange_value, (oop*)dest, compare_value); |
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549 } |
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550 } |
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551 |
| 0 | 552 // Used only for markSweep, scavenging |
| 553 inline bool oopDesc::is_gc_marked() const { | |
| 554 return mark()->is_marked(); | |
| 555 } | |
| 556 | |
| 557 inline bool oopDesc::is_locked() const { | |
| 558 return mark()->is_locked(); | |
| 559 } | |
| 560 | |
| 561 inline bool oopDesc::is_unlocked() const { | |
| 562 return mark()->is_unlocked(); | |
| 563 } | |
| 564 | |
| 565 inline bool oopDesc::has_bias_pattern() const { | |
| 566 return mark()->has_bias_pattern(); | |
| 567 } | |
| 568 | |
| 569 | |
| 570 // used only for asserts | |
| 571 inline bool oopDesc::is_oop(bool ignore_mark_word) const { | |
| 572 oop obj = (oop) this; | |
| 573 if (!check_obj_alignment(obj)) return false; | |
| 574 if (!Universe::heap()->is_in_reserved(obj)) return false; | |
| 575 // obj is aligned and accessible in heap | |
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576 if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false; |
| 0 | 577 |
| 578 // Header verification: the mark is typically non-NULL. If we're | |
| 579 // at a safepoint, it must not be null. | |
| 580 // Outside of a safepoint, the header could be changing (for example, | |
| 581 // another thread could be inflating a lock on this object). | |
| 582 if (ignore_mark_word) { | |
| 583 return true; | |
| 584 } | |
| 585 if (mark() != NULL) { | |
| 586 return true; | |
| 587 } | |
| 588 return !SafepointSynchronize::is_at_safepoint(); | |
| 589 } | |
| 590 | |
| 591 | |
| 592 // used only for asserts | |
| 593 inline bool oopDesc::is_oop_or_null(bool ignore_mark_word) const { | |
| 594 return this == NULL ? true : is_oop(ignore_mark_word); | |
| 595 } | |
| 596 | |
| 597 #ifndef PRODUCT | |
| 598 // used only for asserts | |
| 599 inline bool oopDesc::is_unlocked_oop() const { | |
| 600 if (!Universe::heap()->is_in_reserved(this)) return false; | |
| 601 return mark()->is_unlocked(); | |
| 602 } | |
| 603 #endif // PRODUCT | |
| 604 | |
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605 inline void oopDesc::follow_contents(void) { |
| 0 | 606 assert (is_gc_marked(), "should be marked"); |
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607 klass()->oop_follow_contents(this); |
| 0 | 608 } |
| 609 | |
| 610 // Used by scavengers | |
| 611 | |
| 612 inline bool oopDesc::is_forwarded() const { | |
| 613 // The extra heap check is needed since the obj might be locked, in which case the | |
| 614 // mark would point to a stack location and have the sentinel bit cleared | |
| 615 return mark()->is_marked(); | |
| 616 } | |
| 617 | |
| 618 // Used by scavengers | |
| 619 inline void oopDesc::forward_to(oop p) { | |
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620 assert(check_obj_alignment(p), |
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621 "forwarding to something not aligned"); |
| 0 | 622 assert(Universe::heap()->is_in_reserved(p), |
| 623 "forwarding to something not in heap"); | |
| 624 markOop m = markOopDesc::encode_pointer_as_mark(p); | |
| 625 assert(m->decode_pointer() == p, "encoding must be reversable"); | |
| 626 set_mark(m); | |
| 627 } | |
| 628 | |
| 629 // Used by parallel scavengers | |
| 630 inline bool oopDesc::cas_forward_to(oop p, markOop compare) { | |
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631 assert(check_obj_alignment(p), |
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632 "forwarding to something not aligned"); |
| 0 | 633 assert(Universe::heap()->is_in_reserved(p), |
| 634 "forwarding to something not in heap"); | |
| 635 markOop m = markOopDesc::encode_pointer_as_mark(p); | |
| 636 assert(m->decode_pointer() == p, "encoding must be reversable"); | |
| 637 return cas_set_mark(m, compare) == compare; | |
| 638 } | |
| 639 | |
| 640 // Note that the forwardee is not the same thing as the displaced_mark. | |
| 641 // The forwardee is used when copying during scavenge and mark-sweep. | |
| 642 // It does need to clear the low two locking- and GC-related bits. | |
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643 inline oop oopDesc::forwardee() const { |
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644 return (oop) mark()->decode_pointer(); |
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645 } |
| 0 | 646 |
| 647 inline bool oopDesc::has_displaced_mark() const { | |
| 648 return mark()->has_displaced_mark_helper(); | |
| 649 } | |
| 650 | |
| 651 inline markOop oopDesc::displaced_mark() const { | |
| 652 return mark()->displaced_mark_helper(); | |
| 653 } | |
| 654 | |
| 655 inline void oopDesc::set_displaced_mark(markOop m) { | |
| 656 mark()->set_displaced_mark_helper(m); | |
| 657 } | |
| 658 | |
| 659 // The following method needs to be MT safe. | |
| 6818 | 660 inline uint oopDesc::age() const { |
| 0 | 661 assert(!is_forwarded(), "Attempt to read age from forwarded mark"); |
| 662 if (has_displaced_mark()) { | |
| 663 return displaced_mark()->age(); | |
| 664 } else { | |
| 665 return mark()->age(); | |
| 666 } | |
| 667 } | |
| 668 | |
| 669 inline void oopDesc::incr_age() { | |
| 670 assert(!is_forwarded(), "Attempt to increment age of forwarded mark"); | |
| 671 if (has_displaced_mark()) { | |
| 672 set_displaced_mark(displaced_mark()->incr_age()); | |
| 673 } else { | |
| 674 set_mark(mark()->incr_age()); | |
| 675 } | |
| 676 } | |
| 677 | |
| 678 | |
| 679 inline intptr_t oopDesc::identity_hash() { | |
| 680 // Fast case; if the object is unlocked and the hash value is set, no locking is needed | |
| 681 // Note: The mark must be read into local variable to avoid concurrent updates. | |
| 682 markOop mrk = mark(); | |
| 683 if (mrk->is_unlocked() && !mrk->has_no_hash()) { | |
| 684 return mrk->hash(); | |
| 685 } else if (mrk->is_marked()) { | |
| 686 return mrk->hash(); | |
| 687 } else { | |
| 688 return slow_identity_hash(); | |
| 689 } | |
| 690 } | |
| 691 | |
| 692 inline int oopDesc::adjust_pointers() { | |
| 693 debug_only(int check_size = size()); | |
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694 int s = klass()->oop_adjust_pointers(this); |
| 0 | 695 assert(s == check_size, "should be the same"); |
| 696 return s; | |
| 697 } | |
| 698 | |
| 699 #define OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 700 \ | |
| 701 inline int oopDesc::oop_iterate(OopClosureType* blk) { \ | |
| 702 SpecializationStats::record_call(); \ | |
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703 return klass()->oop_oop_iterate##nv_suffix(this, blk); \ |
| 0 | 704 } \ |
| 705 \ | |
| 706 inline int oopDesc::oop_iterate(OopClosureType* blk, MemRegion mr) { \ | |
| 707 SpecializationStats::record_call(); \ | |
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708 return klass()->oop_oop_iterate##nv_suffix##_m(this, blk, mr); \ |
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709 } |
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710 |
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711 |
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712 inline int oopDesc::oop_iterate_no_header(OopClosure* blk) { |
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713 // The NoHeaderExtendedOopClosure wraps the OopClosure and proxies all |
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714 // the do_oop calls, but turns off all other features in ExtendedOopClosure. |
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715 NoHeaderExtendedOopClosure cl(blk); |
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716 return oop_iterate(&cl); |
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717 } |
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718 |
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719 inline int oopDesc::oop_iterate_no_header(OopClosure* blk, MemRegion mr) { |
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720 NoHeaderExtendedOopClosure cl(blk); |
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721 return oop_iterate(&cl, mr); |
| 0 | 722 } |
| 723 | |
| 724 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DEFN) | |
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725 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DEFN) |
| 0 | 726 |
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727 #if INCLUDE_ALL_GCS |
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728 #define OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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729 \ |
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730 inline int oopDesc::oop_iterate_backwards(OopClosureType* blk) { \ |
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731 SpecializationStats::record_call(); \ |
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6725
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732 return klass()->oop_oop_iterate_backwards##nv_suffix(this, blk); \ |
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733 } |
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734 |
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735 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DEFN) |
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736 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DEFN) |
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737 #endif // INCLUDE_ALL_GCS |
| 0 | 738 |
| 1972 | 739 #endif // SHARE_VM_OOPS_OOP_INLINE_HPP |