Mercurial > hg > truffle
annotate src/share/vm/oops/oop.inline.hpp @ 974:26b774d693aa
Merge
| author | acorn |
|---|---|
| date | Wed, 16 Sep 2009 09:10:57 -0400 |
| parents | df6caf649ff7 |
| children | c18cbe5936b8 2d127394260e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 579 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // Implementation of all inlined member functions defined in oop.hpp | |
| 26 // We need a separate file to avoid circular references | |
| 27 | |
| 28 inline void oopDesc::release_set_mark(markOop m) { | |
| 29 OrderAccess::release_store_ptr(&_mark, m); | |
| 30 } | |
| 31 | |
| 32 inline markOop oopDesc::cas_set_mark(markOop new_mark, markOop old_mark) { | |
| 33 return (markOop) Atomic::cmpxchg_ptr(new_mark, &_mark, old_mark); | |
| 34 } | |
| 35 | |
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36 inline klassOop oopDesc::klass() const { |
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37 if (UseCompressedOops) { |
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38 return (klassOop)decode_heap_oop_not_null(_metadata._compressed_klass); |
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39 } else { |
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40 return _metadata._klass; |
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41 } |
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42 } |
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43 |
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44 inline klassOop oopDesc::klass_or_null() const volatile { |
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45 // can be NULL in CMS |
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46 if (UseCompressedOops) { |
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47 return (klassOop)decode_heap_oop(_metadata._compressed_klass); |
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48 } else { |
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49 return _metadata._klass; |
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50 } |
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51 } |
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52 |
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53 inline int oopDesc::klass_gap_offset_in_bytes() { |
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54 assert(UseCompressedOops, "only applicable to compressed headers"); |
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55 return oopDesc::klass_offset_in_bytes() + sizeof(narrowOop); |
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56 } |
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57 |
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58 inline oop* oopDesc::klass_addr() { |
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59 // Only used internally and with CMS and will not work with |
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60 // UseCompressedOops |
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61 assert(!UseCompressedOops, "only supported with uncompressed oops"); |
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62 return (oop*) &_metadata._klass; |
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63 } |
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64 |
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65 inline narrowOop* oopDesc::compressed_klass_addr() { |
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66 assert(UseCompressedOops, "only called by compressed oops"); |
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67 return (narrowOop*) &_metadata._compressed_klass; |
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68 } |
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69 |
| 0 | 70 inline void oopDesc::set_klass(klassOop k) { |
| 71 // since klasses are promoted no store check is needed | |
| 72 assert(Universe::is_bootstrapping() || k != NULL, "must be a real klassOop"); | |
| 73 assert(Universe::is_bootstrapping() || k->is_klass(), "not a klassOop"); | |
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74 if (UseCompressedOops) { |
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75 oop_store_without_check(compressed_klass_addr(), (oop)k); |
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76 } else { |
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77 oop_store_without_check(klass_addr(), (oop) k); |
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78 } |
| 0 | 79 } |
| 80 | |
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81 inline int oopDesc::klass_gap() const { |
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82 return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()); |
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83 } |
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84 |
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85 inline void oopDesc::set_klass_gap(int v) { |
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86 if (UseCompressedOops) { |
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87 *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()) = v; |
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88 } |
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89 } |
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90 |
| 0 | 91 inline void oopDesc::set_klass_to_list_ptr(oop k) { |
| 92 // This is only to be used during GC, for from-space objects, so no | |
| 93 // barrier is needed. | |
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94 if (UseCompressedOops) { |
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95 _metadata._compressed_klass = encode_heap_oop(k); // may be null (parnew overflow handling) |
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96 } else { |
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97 _metadata._klass = (klassOop)k; |
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98 } |
| 0 | 99 } |
| 100 | |
| 101 inline void oopDesc::init_mark() { set_mark(markOopDesc::prototype_for_object(this)); } | |
| 102 inline Klass* oopDesc::blueprint() const { return klass()->klass_part(); } | |
| 103 | |
| 104 inline bool oopDesc::is_a(klassOop k) const { return blueprint()->is_subtype_of(k); } | |
| 105 | |
| 106 inline bool oopDesc::is_instance() const { return blueprint()->oop_is_instance(); } | |
| 107 inline bool oopDesc::is_instanceRef() const { return blueprint()->oop_is_instanceRef(); } | |
| 108 inline bool oopDesc::is_array() const { return blueprint()->oop_is_array(); } | |
| 109 inline bool oopDesc::is_objArray() const { return blueprint()->oop_is_objArray(); } | |
| 110 inline bool oopDesc::is_typeArray() const { return blueprint()->oop_is_typeArray(); } | |
| 111 inline bool oopDesc::is_javaArray() const { return blueprint()->oop_is_javaArray(); } | |
| 112 inline bool oopDesc::is_symbol() const { return blueprint()->oop_is_symbol(); } | |
| 113 inline bool oopDesc::is_klass() const { return blueprint()->oop_is_klass(); } | |
| 114 inline bool oopDesc::is_thread() const { return blueprint()->oop_is_thread(); } | |
| 115 inline bool oopDesc::is_method() const { return blueprint()->oop_is_method(); } | |
| 116 inline bool oopDesc::is_constMethod() const { return blueprint()->oop_is_constMethod(); } | |
| 117 inline bool oopDesc::is_methodData() const { return blueprint()->oop_is_methodData(); } | |
| 118 inline bool oopDesc::is_constantPool() const { return blueprint()->oop_is_constantPool(); } | |
| 119 inline bool oopDesc::is_constantPoolCache() const { return blueprint()->oop_is_constantPoolCache(); } | |
| 120 inline bool oopDesc::is_compiledICHolder() const { return blueprint()->oop_is_compiledICHolder(); } | |
| 121 | |
| 122 inline void* oopDesc::field_base(int offset) const { return (void*)&((char*)this)[offset]; } | |
| 123 | |
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124 template <class T> inline T* oopDesc::obj_field_addr(int offset) const { return (T*)field_base(offset); } |
| 0 | 125 inline jbyte* oopDesc::byte_field_addr(int offset) const { return (jbyte*) field_base(offset); } |
| 126 inline jchar* oopDesc::char_field_addr(int offset) const { return (jchar*) field_base(offset); } | |
| 127 inline jboolean* oopDesc::bool_field_addr(int offset) const { return (jboolean*)field_base(offset); } | |
| 128 inline jint* oopDesc::int_field_addr(int offset) const { return (jint*) field_base(offset); } | |
| 129 inline jshort* oopDesc::short_field_addr(int offset) const { return (jshort*) field_base(offset); } | |
| 130 inline jlong* oopDesc::long_field_addr(int offset) const { return (jlong*) field_base(offset); } | |
| 131 inline jfloat* oopDesc::float_field_addr(int offset) const { return (jfloat*) field_base(offset); } | |
| 132 inline jdouble* oopDesc::double_field_addr(int offset) const { return (jdouble*) field_base(offset); } | |
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133 inline address* oopDesc::address_field_addr(int offset) const { return (address*) field_base(offset); } |
| 0 | 134 |
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135 |
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136 // Functions for getting and setting oops within instance objects. |
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137 // If the oops are compressed, the type passed to these overloaded functions |
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138 // is narrowOop. All functions are overloaded so they can be called by |
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139 // template functions without conditionals (the compiler instantiates via |
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140 // the right type and inlines the appopriate code). |
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141 |
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142 inline bool oopDesc::is_null(oop obj) { return obj == NULL; } |
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143 inline bool oopDesc::is_null(narrowOop obj) { return obj == 0; } |
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144 |
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145 // Algorithm for encoding and decoding oops from 64 bit pointers to 32 bit |
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146 // offset from the heap base. Saving the check for null can save instructions |
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147 // in inner GC loops so these are separated. |
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148 |
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149 inline narrowOop oopDesc::encode_heap_oop_not_null(oop v) { |
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150 assert(!is_null(v), "oop value can never be zero"); |
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151 assert(Universe::heap()->is_in_reserved(v), "Address not in heap"); |
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152 address base = Universe::narrow_oop_base(); |
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153 int shift = Universe::narrow_oop_shift(); |
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154 uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1)); |
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155 assert(OopEncodingHeapMax > pd, "change encoding max if new encoding"); |
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156 uint64_t result = pd >> shift; |
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157 assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow"); |
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158 assert(decode_heap_oop(result) == v, "reversibility"); |
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159 return (narrowOop)result; |
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160 } |
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161 |
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162 inline narrowOop oopDesc::encode_heap_oop(oop v) { |
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163 return (is_null(v)) ? (narrowOop)0 : encode_heap_oop_not_null(v); |
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164 } |
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165 |
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166 inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) { |
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167 assert(!is_null(v), "narrow oop value can never be zero"); |
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168 address base = Universe::narrow_oop_base(); |
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169 int shift = Universe::narrow_oop_shift(); |
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170 return (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift)); |
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171 } |
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172 |
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173 inline oop oopDesc::decode_heap_oop(narrowOop v) { |
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174 return is_null(v) ? (oop)NULL : decode_heap_oop_not_null(v); |
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175 } |
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176 |
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177 inline oop oopDesc::decode_heap_oop_not_null(oop v) { return v; } |
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178 inline oop oopDesc::decode_heap_oop(oop v) { return v; } |
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179 |
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180 // Load an oop out of the Java heap as is without decoding. |
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181 // Called by GC to check for null before decoding. |
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182 inline oop oopDesc::load_heap_oop(oop* p) { return *p; } |
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183 inline narrowOop oopDesc::load_heap_oop(narrowOop* p) { return *p; } |
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184 |
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185 // Load and decode an oop out of the Java heap into a wide oop. |
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186 inline oop oopDesc::load_decode_heap_oop_not_null(oop* p) { return *p; } |
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187 inline oop oopDesc::load_decode_heap_oop_not_null(narrowOop* p) { |
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188 return decode_heap_oop_not_null(*p); |
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189 } |
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190 |
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191 // Load and decode an oop out of the heap accepting null |
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192 inline oop oopDesc::load_decode_heap_oop(oop* p) { return *p; } |
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193 inline oop oopDesc::load_decode_heap_oop(narrowOop* p) { |
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194 return decode_heap_oop(*p); |
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195 } |
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196 |
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197 // Store already encoded heap oop into the heap. |
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198 inline void oopDesc::store_heap_oop(oop* p, oop v) { *p = v; } |
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199 inline void oopDesc::store_heap_oop(narrowOop* p, narrowOop v) { *p = v; } |
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200 |
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201 // Encode and store a heap oop. |
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202 inline void oopDesc::encode_store_heap_oop_not_null(narrowOop* p, oop v) { |
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203 *p = encode_heap_oop_not_null(v); |
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204 } |
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205 inline void oopDesc::encode_store_heap_oop_not_null(oop* p, oop v) { *p = v; } |
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206 |
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207 // Encode and store a heap oop allowing for null. |
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208 inline void oopDesc::encode_store_heap_oop(narrowOop* p, oop v) { |
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209 *p = encode_heap_oop(v); |
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210 } |
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211 inline void oopDesc::encode_store_heap_oop(oop* p, oop v) { *p = v; } |
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212 |
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213 // Store heap oop as is for volatile fields. |
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214 inline void oopDesc::release_store_heap_oop(volatile oop* p, oop v) { |
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215 OrderAccess::release_store_ptr(p, v); |
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216 } |
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217 inline void oopDesc::release_store_heap_oop(volatile narrowOop* p, |
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218 narrowOop v) { |
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219 OrderAccess::release_store(p, v); |
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220 } |
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221 |
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222 inline void oopDesc::release_encode_store_heap_oop_not_null( |
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223 volatile narrowOop* p, oop v) { |
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224 // heap oop is not pointer sized. |
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225 OrderAccess::release_store(p, encode_heap_oop_not_null(v)); |
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226 } |
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227 |
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228 inline void oopDesc::release_encode_store_heap_oop_not_null( |
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229 volatile oop* p, oop v) { |
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230 OrderAccess::release_store_ptr(p, v); |
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231 } |
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232 |
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233 inline void oopDesc::release_encode_store_heap_oop(volatile oop* p, |
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234 oop v) { |
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235 OrderAccess::release_store_ptr(p, v); |
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236 } |
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237 inline void oopDesc::release_encode_store_heap_oop( |
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238 volatile narrowOop* p, oop v) { |
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239 OrderAccess::release_store(p, encode_heap_oop(v)); |
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240 } |
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241 |
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242 |
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243 // These functions are only used to exchange oop fields in instances, |
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244 // not headers. |
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245 inline oop oopDesc::atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest) { |
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246 if (UseCompressedOops) { |
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247 // encode exchange value from oop to T |
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248 narrowOop val = encode_heap_oop(exchange_value); |
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249 narrowOop old = (narrowOop)Atomic::xchg(val, (narrowOop*)dest); |
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250 // decode old from T to oop |
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251 return decode_heap_oop(old); |
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252 } else { |
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253 return (oop)Atomic::xchg_ptr(exchange_value, (oop*)dest); |
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254 } |
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255 } |
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256 |
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257 inline oop oopDesc::atomic_compare_exchange_oop(oop exchange_value, |
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258 volatile HeapWord *dest, |
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259 oop compare_value) { |
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260 if (UseCompressedOops) { |
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261 // encode exchange and compare value from oop to T |
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262 narrowOop val = encode_heap_oop(exchange_value); |
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263 narrowOop cmp = encode_heap_oop(compare_value); |
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264 |
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265 narrowOop old = (narrowOop) Atomic::cmpxchg(val, (narrowOop*)dest, cmp); |
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266 // decode old from T to oop |
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267 return decode_heap_oop(old); |
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268 } else { |
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269 return (oop)Atomic::cmpxchg_ptr(exchange_value, (oop*)dest, compare_value); |
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270 } |
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271 } |
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272 |
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273 // In order to put or get a field out of an instance, must first check |
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274 // if the field has been compressed and uncompress it. |
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275 inline oop oopDesc::obj_field(int offset) const { |
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276 return UseCompressedOops ? |
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277 load_decode_heap_oop(obj_field_addr<narrowOop>(offset)) : |
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278 load_decode_heap_oop(obj_field_addr<oop>(offset)); |
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279 } |
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280 inline void oopDesc::obj_field_put(int offset, oop value) { |
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281 UseCompressedOops ? oop_store(obj_field_addr<narrowOop>(offset), value) : |
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282 oop_store(obj_field_addr<oop>(offset), value); |
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283 } |
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284 inline void oopDesc::obj_field_raw_put(int offset, oop value) { |
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285 UseCompressedOops ? |
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286 encode_store_heap_oop(obj_field_addr<narrowOop>(offset), value) : |
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287 encode_store_heap_oop(obj_field_addr<oop>(offset), value); |
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288 } |
| 0 | 289 |
| 290 inline jbyte oopDesc::byte_field(int offset) const { return (jbyte) *byte_field_addr(offset); } | |
| 291 inline void oopDesc::byte_field_put(int offset, jbyte contents) { *byte_field_addr(offset) = (jint) contents; } | |
| 292 | |
| 293 inline jboolean oopDesc::bool_field(int offset) const { return (jboolean) *bool_field_addr(offset); } | |
| 294 inline void oopDesc::bool_field_put(int offset, jboolean contents) { *bool_field_addr(offset) = (jint) contents; } | |
| 295 | |
| 296 inline jchar oopDesc::char_field(int offset) const { return (jchar) *char_field_addr(offset); } | |
| 297 inline void oopDesc::char_field_put(int offset, jchar contents) { *char_field_addr(offset) = (jint) contents; } | |
| 298 | |
| 299 inline jint oopDesc::int_field(int offset) const { return *int_field_addr(offset); } | |
| 300 inline void oopDesc::int_field_put(int offset, jint contents) { *int_field_addr(offset) = contents; } | |
| 301 | |
| 302 inline jshort oopDesc::short_field(int offset) const { return (jshort) *short_field_addr(offset); } | |
| 303 inline void oopDesc::short_field_put(int offset, jshort contents) { *short_field_addr(offset) = (jint) contents;} | |
| 304 | |
| 305 inline jlong oopDesc::long_field(int offset) const { return *long_field_addr(offset); } | |
| 306 inline void oopDesc::long_field_put(int offset, jlong contents) { *long_field_addr(offset) = contents; } | |
| 307 | |
| 308 inline jfloat oopDesc::float_field(int offset) const { return *float_field_addr(offset); } | |
| 309 inline void oopDesc::float_field_put(int offset, jfloat contents) { *float_field_addr(offset) = contents; } | |
| 310 | |
| 311 inline jdouble oopDesc::double_field(int offset) const { return *double_field_addr(offset); } | |
| 312 inline void oopDesc::double_field_put(int offset, jdouble contents) { *double_field_addr(offset) = contents; } | |
| 313 | |
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314 inline address oopDesc::address_field(int offset) const { return *address_field_addr(offset); } |
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315 inline void oopDesc::address_field_put(int offset, address contents) { *address_field_addr(offset) = contents; } |
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316 |
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317 inline oop oopDesc::obj_field_acquire(int offset) const { |
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318 return UseCompressedOops ? |
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319 decode_heap_oop((narrowOop) |
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320 OrderAccess::load_acquire(obj_field_addr<narrowOop>(offset))) |
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321 : decode_heap_oop((oop) |
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322 OrderAccess::load_ptr_acquire(obj_field_addr<oop>(offset))); |
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323 } |
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324 inline void oopDesc::release_obj_field_put(int offset, oop value) { |
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325 UseCompressedOops ? |
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326 oop_store((volatile narrowOop*)obj_field_addr<narrowOop>(offset), value) : |
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327 oop_store((volatile oop*) obj_field_addr<oop>(offset), value); |
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328 } |
| 0 | 329 |
| 330 inline jbyte oopDesc::byte_field_acquire(int offset) const { return OrderAccess::load_acquire(byte_field_addr(offset)); } | |
| 331 inline void oopDesc::release_byte_field_put(int offset, jbyte contents) { OrderAccess::release_store(byte_field_addr(offset), contents); } | |
| 332 | |
| 333 inline jboolean oopDesc::bool_field_acquire(int offset) const { return OrderAccess::load_acquire(bool_field_addr(offset)); } | |
| 334 inline void oopDesc::release_bool_field_put(int offset, jboolean contents) { OrderAccess::release_store(bool_field_addr(offset), contents); } | |
| 335 | |
| 336 inline jchar oopDesc::char_field_acquire(int offset) const { return OrderAccess::load_acquire(char_field_addr(offset)); } | |
| 337 inline void oopDesc::release_char_field_put(int offset, jchar contents) { OrderAccess::release_store(char_field_addr(offset), contents); } | |
| 338 | |
| 339 inline jint oopDesc::int_field_acquire(int offset) const { return OrderAccess::load_acquire(int_field_addr(offset)); } | |
| 340 inline void oopDesc::release_int_field_put(int offset, jint contents) { OrderAccess::release_store(int_field_addr(offset), contents); } | |
| 341 | |
| 342 inline jshort oopDesc::short_field_acquire(int offset) const { return (jshort)OrderAccess::load_acquire(short_field_addr(offset)); } | |
| 343 inline void oopDesc::release_short_field_put(int offset, jshort contents) { OrderAccess::release_store(short_field_addr(offset), contents); } | |
| 344 | |
| 345 inline jlong oopDesc::long_field_acquire(int offset) const { return OrderAccess::load_acquire(long_field_addr(offset)); } | |
| 346 inline void oopDesc::release_long_field_put(int offset, jlong contents) { OrderAccess::release_store(long_field_addr(offset), contents); } | |
| 347 | |
| 348 inline jfloat oopDesc::float_field_acquire(int offset) const { return OrderAccess::load_acquire(float_field_addr(offset)); } | |
| 349 inline void oopDesc::release_float_field_put(int offset, jfloat contents) { OrderAccess::release_store(float_field_addr(offset), contents); } | |
| 350 | |
| 351 inline jdouble oopDesc::double_field_acquire(int offset) const { return OrderAccess::load_acquire(double_field_addr(offset)); } | |
| 352 inline void oopDesc::release_double_field_put(int offset, jdouble contents) { OrderAccess::release_store(double_field_addr(offset), contents); } | |
| 353 | |
| 710 | 354 inline address oopDesc::address_field_acquire(int offset) const { return (address) OrderAccess::load_ptr_acquire(address_field_addr(offset)); } |
| 355 inline void oopDesc::release_address_field_put(int offset, address contents) { OrderAccess::release_store_ptr(address_field_addr(offset), contents); } | |
| 356 | |
| 0 | 357 inline int oopDesc::size_given_klass(Klass* klass) { |
| 358 int lh = klass->layout_helper(); | |
| 359 int s = lh >> LogHeapWordSize; // deliver size scaled by wordSize | |
| 360 | |
| 361 // lh is now a value computed at class initialization that may hint | |
| 362 // at the size. For instances, this is positive and equal to the | |
| 363 // size. For arrays, this is negative and provides log2 of the | |
| 364 // array element size. For other oops, it is zero and thus requires | |
| 365 // a virtual call. | |
| 366 // | |
| 367 // We go to all this trouble because the size computation is at the | |
| 368 // heart of phase 2 of mark-compaction, and called for every object, | |
| 369 // alive or dead. So the speed here is equal in importance to the | |
| 370 // speed of allocation. | |
| 371 | |
| 372 if (lh <= Klass::_lh_neutral_value) { | |
| 373 // The most common case is instances; fall through if so. | |
| 374 if (lh < Klass::_lh_neutral_value) { | |
| 375 // Second most common case is arrays. We have to fetch the | |
| 376 // length of the array, shift (multiply) it appropriately, | |
| 377 // up to wordSize, add the header, and align to object size. | |
| 378 size_t size_in_bytes; | |
| 379 #ifdef _M_IA64 | |
| 380 // The Windows Itanium Aug 2002 SDK hoists this load above | |
| 381 // the check for s < 0. An oop at the end of the heap will | |
| 382 // cause an access violation if this load is performed on a non | |
| 383 // array oop. Making the reference volatile prohibits this. | |
| 384 // (%%% please explain by what magic the length is actually fetched!) | |
| 385 volatile int *array_length; | |
| 386 array_length = (volatile int *)( (intptr_t)this + | |
| 387 arrayOopDesc::length_offset_in_bytes() ); | |
| 388 assert(array_length > 0, "Integer arithmetic problem somewhere"); | |
| 389 // Put into size_t to avoid overflow. | |
| 390 size_in_bytes = (size_t) array_length; | |
| 391 size_in_bytes = size_in_bytes << Klass::layout_helper_log2_element_size(lh); | |
| 392 #else | |
| 393 size_t array_length = (size_t) ((arrayOop)this)->length(); | |
| 394 size_in_bytes = array_length << Klass::layout_helper_log2_element_size(lh); | |
| 395 #endif | |
| 396 size_in_bytes += Klass::layout_helper_header_size(lh); | |
| 397 | |
| 398 // This code could be simplified, but by keeping array_header_in_bytes | |
| 399 // in units of bytes and doing it this way we can round up just once, | |
| 400 // skipping the intermediate round to HeapWordSize. Cast the result | |
| 401 // of round_to to size_t to guarantee unsigned division == right shift. | |
| 402 s = (int)((size_t)round_to(size_in_bytes, MinObjAlignmentInBytes) / | |
| 403 HeapWordSize); | |
| 404 | |
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405 // UseParNewGC, UseParallelGC and UseG1GC can change the length field |
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406 // of an "old copy" of an object array in the young gen so it indicates |
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407 // the grey portion of an already copied array. This will cause the first |
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408 // disjunct below to fail if the two comparands are computed across such |
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409 // a concurrent change. |
| 0 | 410 // UseParNewGC also runs with promotion labs (which look like int |
| 411 // filler arrays) which are subject to changing their declared size | |
| 412 // when finally retiring a PLAB; this also can cause the first disjunct | |
| 413 // to fail for another worker thread that is concurrently walking the block | |
| 414 // offset table. Both these invariant failures are benign for their | |
| 415 // current uses; we relax the assertion checking to cover these two cases below: | |
| 416 // is_objArray() && is_forwarded() // covers first scenario above | |
| 417 // || is_typeArray() // covers second scenario above | |
| 418 // If and when UseParallelGC uses the same obj array oop stealing/chunking | |
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419 // technique, we will need to suitably modify the assertion. |
| 0 | 420 assert((s == klass->oop_size(this)) || |
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421 (Universe::heap()->is_gc_active() && |
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422 ((is_typeArray() && UseParNewGC) || |
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423 (is_objArray() && is_forwarded() && (UseParNewGC || UseParallelGC || UseG1GC)))), |
| 0 | 424 "wrong array object size"); |
| 425 } else { | |
| 426 // Must be zero, so bite the bullet and take the virtual call. | |
| 427 s = klass->oop_size(this); | |
| 428 } | |
| 429 } | |
| 430 | |
| 431 assert(s % MinObjAlignment == 0, "alignment check"); | |
| 432 assert(s > 0, "Bad size calculated"); | |
| 433 return s; | |
| 434 } | |
| 435 | |
| 436 | |
| 437 inline int oopDesc::size() { | |
| 438 return size_given_klass(blueprint()); | |
| 439 } | |
| 440 | |
| 441 inline bool oopDesc::is_parsable() { | |
| 442 return blueprint()->oop_is_parsable(this); | |
| 443 } | |
| 444 | |
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445 inline bool oopDesc::is_conc_safe() { |
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446 return blueprint()->oop_is_conc_safe(this); |
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447 } |
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448 |
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449 inline void update_barrier_set(void* p, oop v) { |
| 0 | 450 assert(oopDesc::bs() != NULL, "Uninitialized bs in oop!"); |
| 451 oopDesc::bs()->write_ref_field(p, v); | |
| 452 } | |
| 453 | |
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454 template <class T> inline void update_barrier_set_pre(T* p, oop v) { |
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455 oopDesc::bs()->write_ref_field_pre(p, v); |
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456 } |
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457 |
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458 template <class T> inline void oop_store(T* p, oop v) { |
| 0 | 459 if (always_do_update_barrier) { |
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460 oop_store((volatile T*)p, v); |
| 0 | 461 } else { |
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462 update_barrier_set_pre(p, v); |
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463 oopDesc::encode_store_heap_oop(p, v); |
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464 update_barrier_set((void*)p, v); // cast away type |
| 0 | 465 } |
| 466 } | |
| 467 | |
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468 template <class T> inline void oop_store(volatile T* p, oop v) { |
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469 update_barrier_set_pre((T*)p, v); // cast away volatile |
| 0 | 470 // Used by release_obj_field_put, so use release_store_ptr. |
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471 oopDesc::release_encode_store_heap_oop(p, v); |
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472 update_barrier_set((void*)p, v); // cast away type |
| 0 | 473 } |
| 474 | |
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475 template <class T> inline void oop_store_without_check(T* p, oop v) { |
| 0 | 476 // XXX YSR FIX ME!!! |
| 477 if (always_do_update_barrier) { | |
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478 oop_store(p, v); |
| 0 | 479 } else { |
| 480 assert(!Universe::heap()->barrier_set()->write_ref_needs_barrier(p, v), | |
| 481 "oop store without store check failed"); | |
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482 oopDesc::encode_store_heap_oop(p, v); |
| 0 | 483 } |
| 484 } | |
| 485 | |
| 486 // When it absolutely has to get there. | |
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487 template <class T> inline void oop_store_without_check(volatile T* p, oop v) { |
| 0 | 488 // XXX YSR FIX ME!!! |
| 489 if (always_do_update_barrier) { | |
| 490 oop_store(p, v); | |
| 491 } else { | |
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492 assert(!Universe::heap()->barrier_set()->write_ref_needs_barrier((T*)p, v), |
| 0 | 493 "oop store without store check failed"); |
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494 oopDesc::release_encode_store_heap_oop(p, v); |
| 0 | 495 } |
| 496 } | |
| 497 | |
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498 // Should replace *addr = oop assignments where addr type depends on UseCompressedOops |
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499 // (without having to remember the function name this calls). |
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500 inline void oop_store_raw(HeapWord* addr, oop value) { |
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501 if (UseCompressedOops) { |
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502 oopDesc::encode_store_heap_oop((narrowOop*)addr, value); |
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503 } else { |
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504 oopDesc::encode_store_heap_oop((oop*)addr, value); |
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505 } |
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506 } |
| 0 | 507 |
| 508 // Used only for markSweep, scavenging | |
| 509 inline bool oopDesc::is_gc_marked() const { | |
| 510 return mark()->is_marked(); | |
| 511 } | |
| 512 | |
| 513 inline bool oopDesc::is_locked() const { | |
| 514 return mark()->is_locked(); | |
| 515 } | |
| 516 | |
| 517 inline bool oopDesc::is_unlocked() const { | |
| 518 return mark()->is_unlocked(); | |
| 519 } | |
| 520 | |
| 521 inline bool oopDesc::has_bias_pattern() const { | |
| 522 return mark()->has_bias_pattern(); | |
| 523 } | |
| 524 | |
| 525 inline bool check_obj_alignment(oop obj) { | |
| 526 return (intptr_t)obj % MinObjAlignmentInBytes == 0; | |
| 527 } | |
| 528 | |
| 529 | |
| 530 // used only for asserts | |
| 531 inline bool oopDesc::is_oop(bool ignore_mark_word) const { | |
| 532 oop obj = (oop) this; | |
| 533 if (!check_obj_alignment(obj)) return false; | |
| 534 if (!Universe::heap()->is_in_reserved(obj)) return false; | |
| 535 // obj is aligned and accessible in heap | |
| 536 // try to find metaclass cycle safely without seg faulting on bad input | |
| 537 // we should reach klassKlassObj by following klass link at most 3 times | |
| 538 for (int i = 0; i < 3; i++) { | |
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539 obj = obj->klass_or_null(); |
| 0 | 540 // klass should be aligned and in permspace |
| 541 if (!check_obj_alignment(obj)) return false; | |
| 542 if (!Universe::heap()->is_in_permanent(obj)) return false; | |
| 543 } | |
| 544 if (obj != Universe::klassKlassObj()) { | |
| 545 // During a dump, the _klassKlassObj moved to a shared space. | |
| 546 if (DumpSharedSpaces && Universe::klassKlassObj()->is_shared()) { | |
| 547 return true; | |
| 548 } | |
| 549 return false; | |
| 550 } | |
| 551 | |
| 552 // Header verification: the mark is typically non-NULL. If we're | |
| 553 // at a safepoint, it must not be null. | |
| 554 // Outside of a safepoint, the header could be changing (for example, | |
| 555 // another thread could be inflating a lock on this object). | |
| 556 if (ignore_mark_word) { | |
| 557 return true; | |
| 558 } | |
| 559 if (mark() != NULL) { | |
| 560 return true; | |
| 561 } | |
| 562 return !SafepointSynchronize::is_at_safepoint(); | |
| 563 } | |
| 564 | |
| 565 | |
| 566 // used only for asserts | |
| 567 inline bool oopDesc::is_oop_or_null(bool ignore_mark_word) const { | |
| 568 return this == NULL ? true : is_oop(ignore_mark_word); | |
| 569 } | |
| 570 | |
| 571 #ifndef PRODUCT | |
| 572 // used only for asserts | |
| 573 inline bool oopDesc::is_unlocked_oop() const { | |
| 574 if (!Universe::heap()->is_in_reserved(this)) return false; | |
| 575 return mark()->is_unlocked(); | |
| 576 } | |
| 577 #endif // PRODUCT | |
| 578 | |
| 579 inline void oopDesc::follow_header() { | |
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580 if (UseCompressedOops) { |
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581 MarkSweep::mark_and_push(compressed_klass_addr()); |
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582 } else { |
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583 MarkSweep::mark_and_push(klass_addr()); |
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584 } |
| 0 | 585 } |
| 586 | |
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587 inline void oopDesc::follow_contents(void) { |
| 0 | 588 assert (is_gc_marked(), "should be marked"); |
| 589 blueprint()->oop_follow_contents(this); | |
| 590 } | |
| 591 | |
| 592 | |
| 593 // Used by scavengers | |
| 594 | |
| 595 inline bool oopDesc::is_forwarded() const { | |
| 596 // The extra heap check is needed since the obj might be locked, in which case the | |
| 597 // mark would point to a stack location and have the sentinel bit cleared | |
| 598 return mark()->is_marked(); | |
| 599 } | |
| 600 | |
| 601 // Used by scavengers | |
| 602 inline void oopDesc::forward_to(oop p) { | |
| 603 assert(Universe::heap()->is_in_reserved(p), | |
| 604 "forwarding to something not in heap"); | |
| 605 markOop m = markOopDesc::encode_pointer_as_mark(p); | |
| 606 assert(m->decode_pointer() == p, "encoding must be reversable"); | |
| 607 set_mark(m); | |
| 608 } | |
| 609 | |
| 610 // Used by parallel scavengers | |
| 611 inline bool oopDesc::cas_forward_to(oop p, markOop compare) { | |
| 612 assert(Universe::heap()->is_in_reserved(p), | |
| 613 "forwarding to something not in heap"); | |
| 614 markOop m = markOopDesc::encode_pointer_as_mark(p); | |
| 615 assert(m->decode_pointer() == p, "encoding must be reversable"); | |
| 616 return cas_set_mark(m, compare) == compare; | |
| 617 } | |
| 618 | |
| 619 // Note that the forwardee is not the same thing as the displaced_mark. | |
| 620 // The forwardee is used when copying during scavenge and mark-sweep. | |
| 621 // It does need to clear the low two locking- and GC-related bits. | |
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622 inline oop oopDesc::forwardee() const { |
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623 return (oop) mark()->decode_pointer(); |
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624 } |
| 0 | 625 |
| 626 inline bool oopDesc::has_displaced_mark() const { | |
| 627 return mark()->has_displaced_mark_helper(); | |
| 628 } | |
| 629 | |
| 630 inline markOop oopDesc::displaced_mark() const { | |
| 631 return mark()->displaced_mark_helper(); | |
| 632 } | |
| 633 | |
| 634 inline void oopDesc::set_displaced_mark(markOop m) { | |
| 635 mark()->set_displaced_mark_helper(m); | |
| 636 } | |
| 637 | |
| 638 // The following method needs to be MT safe. | |
| 639 inline int oopDesc::age() const { | |
| 640 assert(!is_forwarded(), "Attempt to read age from forwarded mark"); | |
| 641 if (has_displaced_mark()) { | |
| 642 return displaced_mark()->age(); | |
| 643 } else { | |
| 644 return mark()->age(); | |
| 645 } | |
| 646 } | |
| 647 | |
| 648 inline void oopDesc::incr_age() { | |
| 649 assert(!is_forwarded(), "Attempt to increment age of forwarded mark"); | |
| 650 if (has_displaced_mark()) { | |
| 651 set_displaced_mark(displaced_mark()->incr_age()); | |
| 652 } else { | |
| 653 set_mark(mark()->incr_age()); | |
| 654 } | |
| 655 } | |
| 656 | |
| 657 | |
| 658 inline intptr_t oopDesc::identity_hash() { | |
| 659 // Fast case; if the object is unlocked and the hash value is set, no locking is needed | |
| 660 // Note: The mark must be read into local variable to avoid concurrent updates. | |
| 661 markOop mrk = mark(); | |
| 662 if (mrk->is_unlocked() && !mrk->has_no_hash()) { | |
| 663 return mrk->hash(); | |
| 664 } else if (mrk->is_marked()) { | |
| 665 return mrk->hash(); | |
| 666 } else { | |
| 667 return slow_identity_hash(); | |
| 668 } | |
| 669 } | |
| 670 | |
| 671 inline void oopDesc::oop_iterate_header(OopClosure* blk) { | |
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672 if (UseCompressedOops) { |
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673 blk->do_oop(compressed_klass_addr()); |
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674 } else { |
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675 blk->do_oop(klass_addr()); |
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676 } |
| 0 | 677 } |
| 678 | |
| 679 inline void oopDesc::oop_iterate_header(OopClosure* blk, MemRegion mr) { | |
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680 if (UseCompressedOops) { |
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681 if (mr.contains(compressed_klass_addr())) { |
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682 blk->do_oop(compressed_klass_addr()); |
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683 } |
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684 } else { |
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685 if (mr.contains(klass_addr())) blk->do_oop(klass_addr()); |
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686 } |
| 0 | 687 } |
| 688 | |
| 689 inline int oopDesc::adjust_pointers() { | |
| 690 debug_only(int check_size = size()); | |
| 691 int s = blueprint()->oop_adjust_pointers(this); | |
| 692 assert(s == check_size, "should be the same"); | |
| 693 return s; | |
| 694 } | |
| 695 | |
| 696 inline void oopDesc::adjust_header() { | |
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697 if (UseCompressedOops) { |
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698 MarkSweep::adjust_pointer(compressed_klass_addr()); |
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699 } else { |
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700 MarkSweep::adjust_pointer(klass_addr()); |
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701 } |
| 0 | 702 } |
| 703 | |
| 704 #define OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 705 \ | |
| 706 inline int oopDesc::oop_iterate(OopClosureType* blk) { \ | |
| 707 SpecializationStats::record_call(); \ | |
| 708 return blueprint()->oop_oop_iterate##nv_suffix(this, blk); \ | |
| 709 } \ | |
| 710 \ | |
| 711 inline int oopDesc::oop_iterate(OopClosureType* blk, MemRegion mr) { \ | |
| 712 SpecializationStats::record_call(); \ | |
| 713 return blueprint()->oop_oop_iterate##nv_suffix##_m(this, blk, mr); \ | |
| 714 } | |
| 715 | |
| 716 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DEFN) | |
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717 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DEFN) |
| 0 | 718 |
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719 #ifndef SERIALGC |
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720 #define OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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721 \ |
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722 inline int oopDesc::oop_iterate_backwards(OopClosureType* blk) { \ |
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723 SpecializationStats::record_call(); \ |
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724 return blueprint()->oop_oop_iterate_backwards##nv_suffix(this, blk); \ |
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725 } |
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726 |
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727 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DEFN) |
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728 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DEFN) |
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729 #endif // !SERIALGC |
| 0 | 730 |
| 731 inline bool oopDesc::is_shared() const { | |
| 732 return CompactingPermGenGen::is_shared(this); | |
| 733 } | |
| 734 | |
| 735 inline bool oopDesc::is_shared_readonly() const { | |
| 736 return CompactingPermGenGen::is_shared_readonly(this); | |
| 737 } | |
| 738 | |
| 739 inline bool oopDesc::is_shared_readwrite() const { | |
| 740 return CompactingPermGenGen::is_shared_readwrite(this); | |
| 741 } |