Mercurial > hg > truffle
annotate src/share/vm/oops/oop.inline.hpp @ 2002:ac637b7220d1
6985015: C1 needs to support compressed oops
Summary: This change implements compressed oops for C1 for x64 and sparc. The changes are mostly on the codegen level, with a few exceptions when we do access things outside of the heap that are uncompressed from the IR. Compressed oops are now also enabled with tiered.
Reviewed-by: twisti, kvn, never, phh
author | iveresov |
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date | Tue, 30 Nov 2010 23:23:40 -0800 |
parents | f95d63e2154a |
children | 06f017f7daa7 3582bf76420e |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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 * | |
1552
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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/compactingPermGenGen.hpp" | |
34 #include "memory/genCollectedHeap.hpp" | |
35 #include "memory/generation.hpp" | |
36 #include "memory/permGen.hpp" | |
37 #include "memory/specialized_oop_closures.hpp" | |
38 #include "oops/arrayKlass.hpp" | |
39 #include "oops/arrayOop.hpp" | |
40 #include "oops/klass.hpp" | |
41 #include "oops/klassOop.hpp" | |
42 #include "oops/markOop.inline.hpp" | |
43 #include "oops/oop.hpp" | |
44 #include "runtime/atomic.hpp" | |
45 #include "runtime/os.hpp" | |
46 #ifdef TARGET_ARCH_x86 | |
47 # include "bytes_x86.hpp" | |
48 #endif | |
49 #ifdef TARGET_ARCH_sparc | |
50 # include "bytes_sparc.hpp" | |
51 #endif | |
52 #ifdef TARGET_ARCH_zero | |
53 # include "bytes_zero.hpp" | |
54 #endif | |
55 | |
0 | 56 // Implementation of all inlined member functions defined in oop.hpp |
57 // We need a separate file to avoid circular references | |
58 | |
59 inline void oopDesc::release_set_mark(markOop m) { | |
60 OrderAccess::release_store_ptr(&_mark, m); | |
61 } | |
62 | |
63 inline markOop oopDesc::cas_set_mark(markOop new_mark, markOop old_mark) { | |
64 return (markOop) Atomic::cmpxchg_ptr(new_mark, &_mark, old_mark); | |
65 } | |
66 | |
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67 inline klassOop oopDesc::klass() const { |
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68 if (UseCompressedOops) { |
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69 return (klassOop)decode_heap_oop_not_null(_metadata._compressed_klass); |
167
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70 } else { |
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71 return _metadata._klass; |
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72 } |
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73 } |
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74 |
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75 inline klassOop oopDesc::klass_or_null() const volatile { |
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76 // can be NULL in CMS |
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77 if (UseCompressedOops) { |
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78 return (klassOop)decode_heap_oop(_metadata._compressed_klass); |
113
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79 } else { |
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80 return _metadata._klass; |
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81 } |
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82 } |
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83 |
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84 inline int oopDesc::klass_gap_offset_in_bytes() { |
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85 assert(UseCompressedOops, "only applicable to compressed headers"); |
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86 return oopDesc::klass_offset_in_bytes() + sizeof(narrowOop); |
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87 } |
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88 |
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89 inline oop* oopDesc::klass_addr() { |
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90 // Only used internally and with CMS and will not work with |
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91 // UseCompressedOops |
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92 assert(!UseCompressedOops, "only supported with uncompressed oops"); |
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93 return (oop*) &_metadata._klass; |
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94 } |
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95 |
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96 inline narrowOop* oopDesc::compressed_klass_addr() { |
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97 assert(UseCompressedOops, "only called by compressed oops"); |
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98 return (narrowOop*) &_metadata._compressed_klass; |
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99 } |
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100 |
0 | 101 inline void oopDesc::set_klass(klassOop k) { |
102 // since klasses are promoted no store check is needed | |
103 assert(Universe::is_bootstrapping() || k != NULL, "must be a real klassOop"); | |
104 assert(Universe::is_bootstrapping() || k->is_klass(), "not a klassOop"); | |
113
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105 if (UseCompressedOops) { |
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106 oop_store_without_check(compressed_klass_addr(), (oop)k); |
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107 } else { |
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108 oop_store_without_check(klass_addr(), (oop) k); |
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109 } |
0 | 110 } |
111 | |
167
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112 inline int oopDesc::klass_gap() const { |
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113 return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()); |
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114 } |
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115 |
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116 inline void oopDesc::set_klass_gap(int v) { |
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117 if (UseCompressedOops) { |
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118 *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()) = v; |
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119 } |
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120 } |
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121 |
0 | 122 inline void oopDesc::set_klass_to_list_ptr(oop k) { |
123 // This is only to be used during GC, for from-space objects, so no | |
124 // barrier is needed. | |
113
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125 if (UseCompressedOops) { |
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126 _metadata._compressed_klass = encode_heap_oop(k); // may be null (parnew overflow handling) |
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127 } else { |
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128 _metadata._klass = (klassOop)k; |
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129 } |
0 | 130 } |
131 | |
132 inline void oopDesc::init_mark() { set_mark(markOopDesc::prototype_for_object(this)); } | |
133 inline Klass* oopDesc::blueprint() const { return klass()->klass_part(); } | |
134 | |
135 inline bool oopDesc::is_a(klassOop k) const { return blueprint()->is_subtype_of(k); } | |
136 | |
137 inline bool oopDesc::is_instance() const { return blueprint()->oop_is_instance(); } | |
138 inline bool oopDesc::is_instanceRef() const { return blueprint()->oop_is_instanceRef(); } | |
139 inline bool oopDesc::is_array() const { return blueprint()->oop_is_array(); } | |
140 inline bool oopDesc::is_objArray() const { return blueprint()->oop_is_objArray(); } | |
141 inline bool oopDesc::is_typeArray() const { return blueprint()->oop_is_typeArray(); } | |
142 inline bool oopDesc::is_javaArray() const { return blueprint()->oop_is_javaArray(); } | |
143 inline bool oopDesc::is_symbol() const { return blueprint()->oop_is_symbol(); } | |
144 inline bool oopDesc::is_klass() const { return blueprint()->oop_is_klass(); } | |
145 inline bool oopDesc::is_thread() const { return blueprint()->oop_is_thread(); } | |
146 inline bool oopDesc::is_method() const { return blueprint()->oop_is_method(); } | |
147 inline bool oopDesc::is_constMethod() const { return blueprint()->oop_is_constMethod(); } | |
148 inline bool oopDesc::is_methodData() const { return blueprint()->oop_is_methodData(); } | |
149 inline bool oopDesc::is_constantPool() const { return blueprint()->oop_is_constantPool(); } | |
150 inline bool oopDesc::is_constantPoolCache() const { return blueprint()->oop_is_constantPoolCache(); } | |
151 inline bool oopDesc::is_compiledICHolder() const { return blueprint()->oop_is_compiledICHolder(); } | |
152 | |
153 inline void* oopDesc::field_base(int offset) const { return (void*)&((char*)this)[offset]; } | |
154 | |
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155 template <class T> inline T* oopDesc::obj_field_addr(int offset) const { return (T*)field_base(offset); } |
0 | 156 inline jbyte* oopDesc::byte_field_addr(int offset) const { return (jbyte*) field_base(offset); } |
157 inline jchar* oopDesc::char_field_addr(int offset) const { return (jchar*) field_base(offset); } | |
158 inline jboolean* oopDesc::bool_field_addr(int offset) const { return (jboolean*)field_base(offset); } | |
159 inline jint* oopDesc::int_field_addr(int offset) const { return (jint*) field_base(offset); } | |
160 inline jshort* oopDesc::short_field_addr(int offset) const { return (jshort*) field_base(offset); } | |
161 inline jlong* oopDesc::long_field_addr(int offset) const { return (jlong*) field_base(offset); } | |
162 inline jfloat* oopDesc::float_field_addr(int offset) const { return (jfloat*) field_base(offset); } | |
163 inline jdouble* oopDesc::double_field_addr(int offset) const { return (jdouble*) field_base(offset); } | |
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164 inline address* oopDesc::address_field_addr(int offset) const { return (address*) field_base(offset); } |
0 | 165 |
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166 |
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167 // Functions for getting and setting oops within instance objects. |
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168 // If the oops are compressed, the type passed to these overloaded functions |
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169 // is narrowOop. All functions are overloaded so they can be called by |
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170 // template functions without conditionals (the compiler instantiates via |
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171 // the right type and inlines the appopriate code). |
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172 |
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173 inline bool oopDesc::is_null(oop obj) { return obj == NULL; } |
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174 inline bool oopDesc::is_null(narrowOop obj) { return obj == 0; } |
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175 |
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176 // Algorithm for encoding and decoding oops from 64 bit pointers to 32 bit |
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177 // offset from the heap base. Saving the check for null can save instructions |
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178 // in inner GC loops so these are separated. |
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179 |
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180 inline bool check_obj_alignment(oop obj) { |
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181 return (intptr_t)obj % MinObjAlignmentInBytes == 0; |
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182 } |
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183 |
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184 inline narrowOop oopDesc::encode_heap_oop_not_null(oop v) { |
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185 assert(!is_null(v), "oop value can never be zero"); |
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186 assert(check_obj_alignment(v), "Address not aligned"); |
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187 assert(Universe::heap()->is_in_reserved(v), "Address not in heap"); |
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188 address base = Universe::narrow_oop_base(); |
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189 int shift = Universe::narrow_oop_shift(); |
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190 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1)); |
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191 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding"); |
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192 uint64_t result = pd >> shift; |
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193 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow"); |
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194 assert(decode_heap_oop(result) == v, "reversibility"); |
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195 return (narrowOop)result; |
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196 } |
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197 |
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198 inline narrowOop oopDesc::encode_heap_oop(oop v) { |
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199 return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v); |
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200 } |
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201 |
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202 inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) { |
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203 assert(!is_null(v), "narrow oop value can never be zero"); |
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204 address base = Universe::narrow_oop_base(); |
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205 int shift = Universe::narrow_oop_shift(); |
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206 oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift)); |
1846 | 207 assert(check_obj_alignment(result), err_msg("address not aligned: " PTR_FORMAT, (void*) result)); |
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208 return result; |
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209 } |
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210 |
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211 inline oop oopDesc::decode_heap_oop(narrowOop v) { |
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212 return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v); |
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213 } |
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214 |
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215 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; } |
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216 inline oop oopDesc::decode_heap_oop(oop v) { return v; } |
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217 |
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218 // Load an oop out of the Java heap as is without decoding. |
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219 // Called by GC to check for null before decoding. |
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220 inline oop oopDesc::load_heap_oop(oop* p) { return *p; } |
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221 inline narrowOop oopDesc::load_heap_oop(narrowOop* p) { return *p; } |
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222 |
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223 // Load and decode an oop out of the Java heap into a wide oop. |
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224 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p) { return *p; } |
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225 inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) { |
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226 return decode_heap_oop_not_null(*p); |
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227 } |
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228 |
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229 // Load and decode an oop out of the heap accepting null |
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230 inline oop oopDesc::load_decode_heap_oop(oop* p) { return *p; } |
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231 inline oop oopDesc::load_decode_heap_oop(narrowOop* p) { |
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232 return decode_heap_oop(*p); |
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233 } |
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234 |
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235 // Store already encoded heap oop into the heap. |
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236 inline void oopDesc::store_heap_oop(oop* p, oop v) { *p = v; } |
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237 inline void oopDesc::store_heap_oop(narrowOop* p, narrowOop v) { *p = v; } |
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238 |
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239 // Encode and store a heap oop. |
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240 inline void oopDesc::encode_store_heap_oop_not_null(narrowOop* p, oop v) { |
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241 *p = encode_heap_oop_not_null(v); |
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242 } |
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243 inline void oopDesc::encode_store_heap_oop_not_null(oop* p, oop v) { *p = v; } |
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244 |
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245 // Encode and store a heap oop allowing for null. |
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246 inline void oopDesc::encode_store_heap_oop(narrowOop* p, oop v) { |
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247 *p = encode_heap_oop(v); |
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248 } |
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249 inline void oopDesc::encode_store_heap_oop(oop* p, oop v) { *p = v; } |
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250 |
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251 // Store heap oop as is for volatile fields. |
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252 inline void oopDesc::release_store_heap_oop(volatile oop* p, oop v) { |
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253 OrderAccess::release_store_ptr(p, v); |
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254 } |
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255 inline void oopDesc::release_store_heap_oop(volatile narrowOop* p, |
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256 narrowOop v) { |
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257 OrderAccess::release_store(p, v); |
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258 } |
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259 |
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260 inline void oopDesc::release_encode_store_heap_oop_not_null( |
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261 volatile narrowOop* p, oop v) { |
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262 // heap oop is not pointer sized. |
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263 OrderAccess::release_store(p, encode_heap_oop_not_null(v)); |
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264 } |
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265 |
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266 inline void oopDesc::release_encode_store_heap_oop_not_null( |
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267 volatile oop* p, oop v) { |
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268 OrderAccess::release_store_ptr(p, v); |
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269 } |
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270 |
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271 inline void oopDesc::release_encode_store_heap_oop(volatile oop* p, |
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272 oop v) { |
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273 OrderAccess::release_store_ptr(p, v); |
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274 } |
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275 inline void oopDesc::release_encode_store_heap_oop( |
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276 volatile narrowOop* p, oop v) { |
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277 OrderAccess::release_store(p, encode_heap_oop(v)); |
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278 } |
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279 |
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280 |
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281 // These functions are only used to exchange oop fields in instances, |
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282 // not headers. |
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283 inline oop oopDesc::atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest) { |
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284 if (UseCompressedOops) { |
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285 // encode exchange value from oop to T |
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286 narrowOop val = encode_heap_oop(exchange_value); |
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287 narrowOop old = (narrowOop)Atomic::xchg(val, (narrowOop*)dest); |
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288 // decode old from T to oop |
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289 return decode_heap_oop(old); |
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290 } else { |
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291 return (oop)Atomic::xchg_ptr(exchange_value, (oop*)dest); |
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292 } |
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293 } |
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294 |
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295 inline oop oopDesc::atomic_compare_exchange_oop(oop exchange_value, |
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296 volatile HeapWord *dest, |
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297 oop compare_value) { |
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298 if (UseCompressedOops) { |
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299 // encode exchange and compare value from oop to T |
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300 narrowOop val = encode_heap_oop(exchange_value); |
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301 narrowOop cmp = encode_heap_oop(compare_value); |
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302 |
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303 narrowOop old = (narrowOop) Atomic::cmpxchg(val, (narrowOop*)dest, cmp); |
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304 // decode old from T to oop |
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305 return decode_heap_oop(old); |
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306 } else { |
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307 return (oop)Atomic::cmpxchg_ptr(exchange_value, (oop*)dest, compare_value); |
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308 } |
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309 } |
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310 |
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311 // In order to put or get a field out of an instance, must first check |
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312 // if the field has been compressed and uncompress it. |
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313 inline oop oopDesc::obj_field(int offset) const { |
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314 return UseCompressedOops ? |
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315 load_decode_heap_oop(obj_field_addr<narrowOop>(offset)) : |
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316 load_decode_heap_oop(obj_field_addr<oop>(offset)); |
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317 } |
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318 inline void oopDesc::obj_field_put(int offset, oop value) { |
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319 UseCompressedOops ? oop_store(obj_field_addr<narrowOop>(offset), value) : |
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320 oop_store(obj_field_addr<oop>(offset), value); |
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321 } |
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322 inline void oopDesc::obj_field_raw_put(int offset, oop value) { |
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323 UseCompressedOops ? |
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324 encode_store_heap_oop(obj_field_addr<narrowOop>(offset), value) : |
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325 encode_store_heap_oop(obj_field_addr<oop>(offset), value); |
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326 } |
0 | 327 |
328 inline jbyte oopDesc::byte_field(int offset) const { return (jbyte) *byte_field_addr(offset); } | |
329 inline void oopDesc::byte_field_put(int offset, jbyte contents) { *byte_field_addr(offset) = (jint) contents; } | |
330 | |
331 inline jboolean oopDesc::bool_field(int offset) const { return (jboolean) *bool_field_addr(offset); } | |
332 inline void oopDesc::bool_field_put(int offset, jboolean contents) { *bool_field_addr(offset) = (jint) contents; } | |
333 | |
334 inline jchar oopDesc::char_field(int offset) const { return (jchar) *char_field_addr(offset); } | |
335 inline void oopDesc::char_field_put(int offset, jchar contents) { *char_field_addr(offset) = (jint) contents; } | |
336 | |
337 inline jint oopDesc::int_field(int offset) const { return *int_field_addr(offset); } | |
338 inline void oopDesc::int_field_put(int offset, jint contents) { *int_field_addr(offset) = contents; } | |
339 | |
340 inline jshort oopDesc::short_field(int offset) const { return (jshort) *short_field_addr(offset); } | |
341 inline void oopDesc::short_field_put(int offset, jshort contents) { *short_field_addr(offset) = (jint) contents;} | |
342 | |
343 inline jlong oopDesc::long_field(int offset) const { return *long_field_addr(offset); } | |
344 inline void oopDesc::long_field_put(int offset, jlong contents) { *long_field_addr(offset) = contents; } | |
345 | |
346 inline jfloat oopDesc::float_field(int offset) const { return *float_field_addr(offset); } | |
347 inline void oopDesc::float_field_put(int offset, jfloat contents) { *float_field_addr(offset) = contents; } | |
348 | |
349 inline jdouble oopDesc::double_field(int offset) const { return *double_field_addr(offset); } | |
350 inline void oopDesc::double_field_put(int offset, jdouble contents) { *double_field_addr(offset) = contents; } | |
351 | |
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352 inline address oopDesc::address_field(int offset) const { return *address_field_addr(offset); } |
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353 inline void oopDesc::address_field_put(int offset, address contents) { *address_field_addr(offset) = contents; } |
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354 |
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355 inline oop oopDesc::obj_field_acquire(int offset) const { |
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356 return UseCompressedOops ? |
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357 decode_heap_oop((narrowOop) |
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358 OrderAccess::load_acquire(obj_field_addr<narrowOop>(offset))) |
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359 : decode_heap_oop((oop) |
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360 OrderAccess::load_ptr_acquire(obj_field_addr<oop>(offset))); |
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361 } |
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362 inline void oopDesc::release_obj_field_put(int offset, oop value) { |
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363 UseCompressedOops ? |
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364 oop_store((volatile narrowOop*)obj_field_addr<narrowOop>(offset), value) : |
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365 oop_store((volatile oop*) obj_field_addr<oop>(offset), value); |
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366 } |
0 | 367 |
368 inline jbyte oopDesc::byte_field_acquire(int offset) const { return OrderAccess::load_acquire(byte_field_addr(offset)); } | |
369 inline void oopDesc::release_byte_field_put(int offset, jbyte contents) { OrderAccess::release_store(byte_field_addr(offset), contents); } | |
370 | |
371 inline jboolean oopDesc::bool_field_acquire(int offset) const { return OrderAccess::load_acquire(bool_field_addr(offset)); } | |
372 inline void oopDesc::release_bool_field_put(int offset, jboolean contents) { OrderAccess::release_store(bool_field_addr(offset), contents); } | |
373 | |
374 inline jchar oopDesc::char_field_acquire(int offset) const { return OrderAccess::load_acquire(char_field_addr(offset)); } | |
375 inline void oopDesc::release_char_field_put(int offset, jchar contents) { OrderAccess::release_store(char_field_addr(offset), contents); } | |
376 | |
377 inline jint oopDesc::int_field_acquire(int offset) const { return OrderAccess::load_acquire(int_field_addr(offset)); } | |
378 inline void oopDesc::release_int_field_put(int offset, jint contents) { OrderAccess::release_store(int_field_addr(offset), contents); } | |
379 | |
380 inline jshort oopDesc::short_field_acquire(int offset) const { return (jshort)OrderAccess::load_acquire(short_field_addr(offset)); } | |
381 inline void oopDesc::release_short_field_put(int offset, jshort contents) { OrderAccess::release_store(short_field_addr(offset), contents); } | |
382 | |
383 inline jlong oopDesc::long_field_acquire(int offset) const { return OrderAccess::load_acquire(long_field_addr(offset)); } | |
384 inline void oopDesc::release_long_field_put(int offset, jlong contents) { OrderAccess::release_store(long_field_addr(offset), contents); } | |
385 | |
386 inline jfloat oopDesc::float_field_acquire(int offset) const { return OrderAccess::load_acquire(float_field_addr(offset)); } | |
387 inline void oopDesc::release_float_field_put(int offset, jfloat contents) { OrderAccess::release_store(float_field_addr(offset), contents); } | |
388 | |
389 inline jdouble oopDesc::double_field_acquire(int offset) const { return OrderAccess::load_acquire(double_field_addr(offset)); } | |
390 inline void oopDesc::release_double_field_put(int offset, jdouble contents) { OrderAccess::release_store(double_field_addr(offset), contents); } | |
391 | |
710 | 392 inline address oopDesc::address_field_acquire(int offset) const { return (address) OrderAccess::load_ptr_acquire(address_field_addr(offset)); } |
393 inline void oopDesc::release_address_field_put(int offset, address contents) { OrderAccess::release_store_ptr(address_field_addr(offset), contents); } | |
394 | |
0 | 395 inline int oopDesc::size_given_klass(Klass* klass) { |
396 int lh = klass->layout_helper(); | |
397 int s = lh >> LogHeapWordSize; // deliver size scaled by wordSize | |
398 | |
399 // lh is now a value computed at class initialization that may hint | |
400 // at the size. For instances, this is positive and equal to the | |
401 // size. For arrays, this is negative and provides log2 of the | |
402 // array element size. For other oops, it is zero and thus requires | |
403 // a virtual call. | |
404 // | |
405 // We go to all this trouble because the size computation is at the | |
406 // heart of phase 2 of mark-compaction, and called for every object, | |
407 // alive or dead. So the speed here is equal in importance to the | |
408 // speed of allocation. | |
409 | |
410 if (lh <= Klass::_lh_neutral_value) { | |
411 // The most common case is instances; fall through if so. | |
412 if (lh < Klass::_lh_neutral_value) { | |
413 // Second most common case is arrays. We have to fetch the | |
414 // length of the array, shift (multiply) it appropriately, | |
415 // up to wordSize, add the header, and align to object size. | |
416 size_t size_in_bytes; | |
417 #ifdef _M_IA64 | |
418 // The Windows Itanium Aug 2002 SDK hoists this load above | |
419 // the check for s < 0. An oop at the end of the heap will | |
420 // cause an access violation if this load is performed on a non | |
421 // array oop. Making the reference volatile prohibits this. | |
422 // (%%% please explain by what magic the length is actually fetched!) | |
423 volatile int *array_length; | |
424 array_length = (volatile int *)( (intptr_t)this + | |
425 arrayOopDesc::length_offset_in_bytes() ); | |
426 assert(array_length > 0, "Integer arithmetic problem somewhere"); | |
427 // Put into size_t to avoid overflow. | |
428 size_in_bytes = (size_t) array_length; | |
429 size_in_bytes = size_in_bytes << Klass::layout_helper_log2_element_size(lh); | |
430 #else | |
431 size_t array_length = (size_t) ((arrayOop)this)->length(); | |
432 size_in_bytes = array_length << Klass::layout_helper_log2_element_size(lh); | |
433 #endif | |
434 size_in_bytes += Klass::layout_helper_header_size(lh); | |
435 | |
436 // This code could be simplified, but by keeping array_header_in_bytes | |
437 // in units of bytes and doing it this way we can round up just once, | |
438 // skipping the intermediate round to HeapWordSize. Cast the result | |
439 // of round_to to size_t to guarantee unsigned division == right shift. | |
440 s = (int)((size_t)round_to(size_in_bytes, MinObjAlignmentInBytes) / | |
441 HeapWordSize); | |
442 | |
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443 // UseParNewGC, UseParallelGC and UseG1GC can change the length field |
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444 // of an "old copy" of an object array in the young gen so it indicates |
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445 // the grey portion of an already copied array. This will cause the first |
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446 // disjunct below to fail if the two comparands are computed across such |
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447 // a concurrent change. |
0 | 448 // UseParNewGC also runs with promotion labs (which look like int |
449 // filler arrays) which are subject to changing their declared size | |
450 // when finally retiring a PLAB; this also can cause the first disjunct | |
451 // to fail for another worker thread that is concurrently walking the block | |
452 // offset table. Both these invariant failures are benign for their | |
453 // current uses; we relax the assertion checking to cover these two cases below: | |
454 // is_objArray() && is_forwarded() // covers first scenario above | |
455 // || is_typeArray() // covers second scenario above | |
456 // If and when UseParallelGC uses the same obj array oop stealing/chunking | |
342
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457 // technique, we will need to suitably modify the assertion. |
0 | 458 assert((s == klass->oop_size(this)) || |
342
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459 (Universe::heap()->is_gc_active() && |
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460 ((is_typeArray() && UseParNewGC) || |
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461 (is_objArray() && is_forwarded() && (UseParNewGC || UseParallelGC || UseG1GC)))), |
0 | 462 "wrong array object size"); |
463 } else { | |
464 // Must be zero, so bite the bullet and take the virtual call. | |
465 s = klass->oop_size(this); | |
466 } | |
467 } | |
468 | |
469 assert(s % MinObjAlignment == 0, "alignment check"); | |
470 assert(s > 0, "Bad size calculated"); | |
471 return s; | |
472 } | |
473 | |
474 | |
475 inline int oopDesc::size() { | |
476 return size_given_klass(blueprint()); | |
477 } | |
478 | |
479 inline bool oopDesc::is_parsable() { | |
480 return blueprint()->oop_is_parsable(this); | |
481 } | |
482 | |
518
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483 inline bool oopDesc::is_conc_safe() { |
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484 return blueprint()->oop_is_conc_safe(this); |
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485 } |
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486 |
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487 inline void update_barrier_set(void* p, oop v) { |
0 | 488 assert(oopDesc::bs() != NULL, "Uninitialized bs in oop!"); |
489 oopDesc::bs()->write_ref_field(p, v); | |
490 } | |
491 | |
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492 template <class T> inline void update_barrier_set_pre(T* p, oop v) { |
342
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493 oopDesc::bs()->write_ref_field_pre(p, v); |
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494 } |
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495 |
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496 template <class T> inline void oop_store(T* p, oop v) { |
0 | 497 if (always_do_update_barrier) { |
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498 oop_store((volatile T*)p, v); |
0 | 499 } else { |
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500 update_barrier_set_pre(p, v); |
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501 oopDesc::encode_store_heap_oop(p, v); |
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502 update_barrier_set((void*)p, v); // cast away type |
0 | 503 } |
504 } | |
505 | |
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506 template <class T> inline void oop_store(volatile T* p, oop v) { |
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507 update_barrier_set_pre((T*)p, v); // cast away volatile |
0 | 508 // Used by release_obj_field_put, so use release_store_ptr. |
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509 oopDesc::release_encode_store_heap_oop(p, v); |
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510 update_barrier_set((void*)p, v); // cast away type |
0 | 511 } |
512 | |
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513 template <class T> inline void oop_store_without_check(T* p, oop v) { |
0 | 514 // XXX YSR FIX ME!!! |
515 if (always_do_update_barrier) { | |
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516 oop_store(p, v); |
0 | 517 } else { |
518 assert(!Universe::heap()->barrier_set()->write_ref_needs_barrier(p, v), | |
519 "oop store without store check failed"); | |
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520 oopDesc::encode_store_heap_oop(p, v); |
0 | 521 } |
522 } | |
523 | |
524 // When it absolutely has to get there. | |
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525 template <class T> inline void oop_store_without_check(volatile T* p, oop v) { |
0 | 526 // XXX YSR FIX ME!!! |
527 if (always_do_update_barrier) { | |
528 oop_store(p, v); | |
529 } else { | |
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530 assert(!Universe::heap()->barrier_set()->write_ref_needs_barrier((T*)p, v), |
0 | 531 "oop store without store check failed"); |
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532 oopDesc::release_encode_store_heap_oop(p, v); |
0 | 533 } |
534 } | |
535 | |
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536 // Should replace *addr = oop assignments where addr type depends on UseCompressedOops |
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537 // (without having to remember the function name this calls). |
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538 inline void oop_store_raw(HeapWord* addr, oop value) { |
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539 if (UseCompressedOops) { |
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540 oopDesc::encode_store_heap_oop((narrowOop*)addr, value); |
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541 } else { |
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542 oopDesc::encode_store_heap_oop((oop*)addr, value); |
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543 } |
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544 } |
0 | 545 |
546 // Used only for markSweep, scavenging | |
547 inline bool oopDesc::is_gc_marked() const { | |
548 return mark()->is_marked(); | |
549 } | |
550 | |
551 inline bool oopDesc::is_locked() const { | |
552 return mark()->is_locked(); | |
553 } | |
554 | |
555 inline bool oopDesc::is_unlocked() const { | |
556 return mark()->is_unlocked(); | |
557 } | |
558 | |
559 inline bool oopDesc::has_bias_pattern() const { | |
560 return mark()->has_bias_pattern(); | |
561 } | |
562 | |
563 | |
564 // used only for asserts | |
565 inline bool oopDesc::is_oop(bool ignore_mark_word) const { | |
566 oop obj = (oop) this; | |
567 if (!check_obj_alignment(obj)) return false; | |
568 if (!Universe::heap()->is_in_reserved(obj)) return false; | |
569 // obj is aligned and accessible in heap | |
570 // try to find metaclass cycle safely without seg faulting on bad input | |
571 // we should reach klassKlassObj by following klass link at most 3 times | |
572 for (int i = 0; i < 3; i++) { | |
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573 obj = obj->klass_or_null(); |
0 | 574 // klass should be aligned and in permspace |
575 if (!check_obj_alignment(obj)) return false; | |
576 if (!Universe::heap()->is_in_permanent(obj)) return false; | |
577 } | |
578 if (obj != Universe::klassKlassObj()) { | |
579 // During a dump, the _klassKlassObj moved to a shared space. | |
580 if (DumpSharedSpaces && Universe::klassKlassObj()->is_shared()) { | |
581 return true; | |
582 } | |
583 return false; | |
584 } | |
585 | |
586 // Header verification: the mark is typically non-NULL. If we're | |
587 // at a safepoint, it must not be null. | |
588 // Outside of a safepoint, the header could be changing (for example, | |
589 // another thread could be inflating a lock on this object). | |
590 if (ignore_mark_word) { | |
591 return true; | |
592 } | |
593 if (mark() != NULL) { | |
594 return true; | |
595 } | |
596 return !SafepointSynchronize::is_at_safepoint(); | |
597 } | |
598 | |
599 | |
600 // used only for asserts | |
601 inline bool oopDesc::is_oop_or_null(bool ignore_mark_word) const { | |
602 return this == NULL ? true : is_oop(ignore_mark_word); | |
603 } | |
604 | |
605 #ifndef PRODUCT | |
606 // used only for asserts | |
607 inline bool oopDesc::is_unlocked_oop() const { | |
608 if (!Universe::heap()->is_in_reserved(this)) return false; | |
609 return mark()->is_unlocked(); | |
610 } | |
611 #endif // PRODUCT | |
612 | |
613 inline void oopDesc::follow_header() { | |
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614 if (UseCompressedOops) { |
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615 MarkSweep::mark_and_push(compressed_klass_addr()); |
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616 } else { |
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617 MarkSweep::mark_and_push(klass_addr()); |
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618 } |
0 | 619 } |
620 | |
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621 inline void oopDesc::follow_contents(void) { |
0 | 622 assert (is_gc_marked(), "should be marked"); |
623 blueprint()->oop_follow_contents(this); | |
624 } | |
625 | |
626 | |
627 // Used by scavengers | |
628 | |
629 inline bool oopDesc::is_forwarded() const { | |
630 // The extra heap check is needed since the obj might be locked, in which case the | |
631 // mark would point to a stack location and have the sentinel bit cleared | |
632 return mark()->is_marked(); | |
633 } | |
634 | |
635 // Used by scavengers | |
636 inline void oopDesc::forward_to(oop p) { | |
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637 assert(check_obj_alignment(p), |
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638 "forwarding to something not aligned"); |
0 | 639 assert(Universe::heap()->is_in_reserved(p), |
640 "forwarding to something not in heap"); | |
641 markOop m = markOopDesc::encode_pointer_as_mark(p); | |
642 assert(m->decode_pointer() == p, "encoding must be reversable"); | |
643 set_mark(m); | |
644 } | |
645 | |
646 // Used by parallel scavengers | |
647 inline bool oopDesc::cas_forward_to(oop p, markOop compare) { | |
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648 assert(check_obj_alignment(p), |
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649 "forwarding to something not aligned"); |
0 | 650 assert(Universe::heap()->is_in_reserved(p), |
651 "forwarding to something not in heap"); | |
652 markOop m = markOopDesc::encode_pointer_as_mark(p); | |
653 assert(m->decode_pointer() == p, "encoding must be reversable"); | |
654 return cas_set_mark(m, compare) == compare; | |
655 } | |
656 | |
657 // Note that the forwardee is not the same thing as the displaced_mark. | |
658 // The forwardee is used when copying during scavenge and mark-sweep. | |
659 // It does need to clear the low two locking- and GC-related bits. | |
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660 inline oop oopDesc::forwardee() const { |
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661 return (oop) mark()->decode_pointer(); |
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662 } |
0 | 663 |
664 inline bool oopDesc::has_displaced_mark() const { | |
665 return mark()->has_displaced_mark_helper(); | |
666 } | |
667 | |
668 inline markOop oopDesc::displaced_mark() const { | |
669 return mark()->displaced_mark_helper(); | |
670 } | |
671 | |
672 inline void oopDesc::set_displaced_mark(markOop m) { | |
673 mark()->set_displaced_mark_helper(m); | |
674 } | |
675 | |
676 // The following method needs to be MT safe. | |
677 inline int oopDesc::age() const { | |
678 assert(!is_forwarded(), "Attempt to read age from forwarded mark"); | |
679 if (has_displaced_mark()) { | |
680 return displaced_mark()->age(); | |
681 } else { | |
682 return mark()->age(); | |
683 } | |
684 } | |
685 | |
686 inline void oopDesc::incr_age() { | |
687 assert(!is_forwarded(), "Attempt to increment age of forwarded mark"); | |
688 if (has_displaced_mark()) { | |
689 set_displaced_mark(displaced_mark()->incr_age()); | |
690 } else { | |
691 set_mark(mark()->incr_age()); | |
692 } | |
693 } | |
694 | |
695 | |
696 inline intptr_t oopDesc::identity_hash() { | |
697 // Fast case; if the object is unlocked and the hash value is set, no locking is needed | |
698 // Note: The mark must be read into local variable to avoid concurrent updates. | |
699 markOop mrk = mark(); | |
700 if (mrk->is_unlocked() && !mrk->has_no_hash()) { | |
701 return mrk->hash(); | |
702 } else if (mrk->is_marked()) { | |
703 return mrk->hash(); | |
704 } else { | |
705 return slow_identity_hash(); | |
706 } | |
707 } | |
708 | |
709 inline void oopDesc::oop_iterate_header(OopClosure* blk) { | |
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710 if (UseCompressedOops) { |
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711 blk->do_oop(compressed_klass_addr()); |
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712 } else { |
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713 blk->do_oop(klass_addr()); |
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714 } |
0 | 715 } |
716 | |
717 inline void oopDesc::oop_iterate_header(OopClosure* blk, MemRegion mr) { | |
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718 if (UseCompressedOops) { |
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719 if (mr.contains(compressed_klass_addr())) { |
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720 blk->do_oop(compressed_klass_addr()); |
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721 } |
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722 } else { |
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723 if (mr.contains(klass_addr())) blk->do_oop(klass_addr()); |
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724 } |
0 | 725 } |
726 | |
727 inline int oopDesc::adjust_pointers() { | |
728 debug_only(int check_size = size()); | |
729 int s = blueprint()->oop_adjust_pointers(this); | |
730 assert(s == check_size, "should be the same"); | |
731 return s; | |
732 } | |
733 | |
734 inline void oopDesc::adjust_header() { | |
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735 if (UseCompressedOops) { |
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736 MarkSweep::adjust_pointer(compressed_klass_addr()); |
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737 } else { |
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738 MarkSweep::adjust_pointer(klass_addr()); |
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739 } |
0 | 740 } |
741 | |
742 #define OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
743 \ | |
744 inline int oopDesc::oop_iterate(OopClosureType* blk) { \ | |
745 SpecializationStats::record_call(); \ | |
746 return blueprint()->oop_oop_iterate##nv_suffix(this, blk); \ | |
747 } \ | |
748 \ | |
749 inline int oopDesc::oop_iterate(OopClosureType* blk, MemRegion mr) { \ | |
750 SpecializationStats::record_call(); \ | |
751 return blueprint()->oop_oop_iterate##nv_suffix##_m(this, blk, mr); \ | |
752 } | |
753 | |
754 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DEFN) | |
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755 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DEFN) |
0 | 756 |
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757 #ifndef SERIALGC |
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758 #define OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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759 \ |
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760 inline int oopDesc::oop_iterate_backwards(OopClosureType* blk) { \ |
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761 SpecializationStats::record_call(); \ |
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762 return blueprint()->oop_oop_iterate_backwards##nv_suffix(this, blk); \ |
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763 } |
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764 |
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765 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DEFN) |
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766 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DEFN) |
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767 #endif // !SERIALGC |
0 | 768 |
769 inline bool oopDesc::is_shared() const { | |
770 return CompactingPermGenGen::is_shared(this); | |
771 } | |
772 | |
773 inline bool oopDesc::is_shared_readonly() const { | |
774 return CompactingPermGenGen::is_shared_readonly(this); | |
775 } | |
776 | |
777 inline bool oopDesc::is_shared_readwrite() const { | |
778 return CompactingPermGenGen::is_shared_readwrite(this); | |
779 } | |
1972 | 780 |
781 #endif // SHARE_VM_OOPS_OOP_INLINE_HPP |