Mercurial > hg > truffle
annotate src/share/vm/oops/arrayKlass.cpp @ 9126:bc26f978b0ce
HotSpotResolvedObjectType: implement hasFinalizeSubclass() correctly
don't use the (wrong) cached value, but ask the runtime on each request.
Fixes regression on xml.* benchmarks @ specjvm2008. The problem was:
After the constructor of Object was deoptimized due to an assumption violation,
it was recompiled again after some time. However, on recompilation, the value
of hasFinalizeSubclass for the class was not updated and it was compiled again
with a, now wrong, assumption, which then triggers deoptimization again.
This was repeated until it hit the recompilation limit (defined by
PerMethodRecompilationCutoff), and therefore only executed by the interpreter
from now on, causing the performance regression.
author | Bernhard Urban <bernhard.urban@jku.at> |
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date | Mon, 15 Apr 2013 19:54:58 +0200 |
parents | 070d523b96a7 |
children | 6bd680e9ea35 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "jvmtifiles/jvmti.h" | |
31 #include "memory/gcLocker.hpp" | |
32 #include "memory/universe.inline.hpp" | |
33 #include "oops/arrayKlass.hpp" | |
34 #include "oops/arrayOop.hpp" | |
35 #include "oops/instanceKlass.hpp" | |
36 #include "oops/objArrayOop.hpp" | |
37 #include "oops/oop.inline.hpp" | |
0 | 38 |
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39 int ArrayKlass::static_size(int header_size) { |
0 | 40 // size of an array klass object |
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41 assert(header_size <= InstanceKlass::header_size(), "bad header size"); |
0 | 42 // If this assert fails, see comments in base_create_array_klass. |
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43 header_size = InstanceKlass::header_size(); |
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44 int vtable_len = Universe::base_vtable_size(); |
0 | 45 #ifdef _LP64 |
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46 int size = header_size + align_object_offset(vtable_len); |
0 | 47 #else |
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48 int size = header_size + vtable_len; |
0 | 49 #endif |
50 return align_object_size(size); | |
51 } | |
52 | |
53 | |
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54 Klass* ArrayKlass::java_super() const { |
0 | 55 if (super() == NULL) return NULL; // bootstrap case |
56 // Array klasses have primary supertypes which are not reported to Java. | |
57 // Example super chain: String[][] -> Object[][] -> Object[] -> Object | |
1142 | 58 return SystemDictionary::Object_klass(); |
0 | 59 } |
60 | |
61 | |
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62 oop ArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) { |
0 | 63 ShouldNotReachHere(); |
64 return NULL; | |
65 } | |
66 | |
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67 Method* ArrayKlass::uncached_lookup_method(Symbol* name, Symbol* signature) const { |
0 | 68 // There are no methods in an array klass but the super class (Object) has some |
69 assert(super(), "super klass must be present"); | |
6983 | 70 return super()->uncached_lookup_method(name, signature); |
0 | 71 } |
72 | |
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73 ArrayKlass::ArrayKlass(Symbol* name) { |
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74 set_alloc_size(0); |
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75 set_name(name); |
0 | 76 |
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77 set_super(Universe::is_bootstrapping() ? (Klass*)NULL : SystemDictionary::Object_klass()); |
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78 set_layout_helper(Klass::_lh_neutral_value); |
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79 set_dimension(1); |
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80 set_higher_dimension(NULL); |
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81 set_lower_dimension(NULL); |
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82 set_component_mirror(NULL); |
0 | 83 // Arrays don't add any new methods, so their vtable is the same size as |
84 // the vtable of klass Object. | |
85 int vtable_size = Universe::base_vtable_size(); | |
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86 set_vtable_length(vtable_size); |
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87 set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5) |
0 | 88 } |
89 | |
90 | |
91 // Initialization of vtables and mirror object is done separatly from base_create_array_klass, | |
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92 // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup. |
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93 void ArrayKlass::complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS) { |
0 | 94 ResourceMark rm(THREAD); |
95 k->initialize_supers(super_klass(), CHECK); | |
96 k->vtable()->initialize_vtable(false, CHECK); | |
97 java_lang_Class::create_mirror(k, CHECK); | |
98 } | |
99 | |
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100 GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots) { |
0 | 101 // interfaces = { cloneable_klass, serializable_klass }; |
102 assert(num_extra_slots == 0, "sanity of primitive array type"); | |
103 // Must share this for correct bootstrapping! | |
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104 set_secondary_supers(Universe::the_array_interfaces_array()); |
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105 return NULL; |
0 | 106 } |
107 | |
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108 bool ArrayKlass::compute_is_subtype_of(Klass* k) { |
0 | 109 // An array is a subtype of Serializable, Clonable, and Object |
1142 | 110 return k == SystemDictionary::Object_klass() |
111 || k == SystemDictionary::Cloneable_klass() | |
112 || k == SystemDictionary::Serializable_klass(); | |
0 | 113 } |
114 | |
115 | |
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116 inline intptr_t* ArrayKlass::start_of_vtable() const { |
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117 // all vtables start at the same place, that's why we use InstanceKlass::header_size here |
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118 return ((intptr_t*)this) + InstanceKlass::header_size(); |
0 | 119 } |
120 | |
121 | |
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122 klassVtable* ArrayKlass::vtable() const { |
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123 KlassHandle kh(Thread::current(), this); |
0 | 124 return new klassVtable(kh, start_of_vtable(), vtable_length() / vtableEntry::size()); |
125 } | |
126 | |
127 | |
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128 objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) { |
0 | 129 if (length < 0) { |
130 THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); | |
131 } | |
132 if (length > arrayOopDesc::max_array_length(T_ARRAY)) { | |
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133 report_java_out_of_memory("Requested array size exceeds VM limit"); |
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134 JvmtiExport::post_array_size_exhausted(); |
0 | 135 THROW_OOP_0(Universe::out_of_memory_error_array_size()); |
136 } | |
137 int size = objArrayOopDesc::object_size(length); | |
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138 Klass* k = array_klass(n+dimension(), CHECK_0); |
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139 ArrayKlass* ak = ArrayKlass::cast(k); |
0 | 140 objArrayOop o = |
141 (objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_0); | |
142 // initialization to NULL not necessary, area already cleared | |
143 return o; | |
144 } | |
145 | |
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146 void ArrayKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) { |
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147 Klass* k = this; |
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148 // Iterate over this array klass and all higher dimensions |
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149 while (k != NULL) { |
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150 f(k, CHECK); |
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151 k = ArrayKlass::cast(k)->higher_dimension(); |
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152 } |
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153 } |
0 | 154 |
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155 void ArrayKlass::array_klasses_do(void f(Klass* k)) { |
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156 Klass* k = this; |
0 | 157 // Iterate over this array klass and all higher dimensions |
158 while (k != NULL) { | |
159 f(k); | |
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160 k = ArrayKlass::cast(k)->higher_dimension(); |
0 | 161 } |
162 } | |
163 | |
164 | |
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165 void ArrayKlass::with_array_klasses_do(void f(Klass* k)) { |
0 | 166 array_klasses_do(f); |
167 } | |
168 | |
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169 |
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170 // GC support |
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171 |
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172 void ArrayKlass::oops_do(OopClosure* cl) { |
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173 Klass::oops_do(cl); |
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174 |
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175 cl->do_oop(adr_component_mirror()); |
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176 } |
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177 |
0 | 178 // JVM support |
179 | |
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180 jint ArrayKlass::compute_modifier_flags(TRAPS) const { |
0 | 181 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; |
182 } | |
183 | |
184 // JVMTI support | |
185 | |
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186 jint ArrayKlass::jvmti_class_status() const { |
0 | 187 return JVMTI_CLASS_STATUS_ARRAY; |
188 } | |
189 | |
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190 void ArrayKlass::remove_unshareable_info() { |
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191 Klass::remove_unshareable_info(); |
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192 // Clear the java mirror |
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193 set_component_mirror(NULL); |
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194 } |
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195 |
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196 void ArrayKlass::restore_unshareable_info(TRAPS) { |
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197 Klass::restore_unshareable_info(CHECK); |
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198 // Klass recreates the component mirror also |
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199 } |
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200 |
0 | 201 // Printing |
202 | |
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203 void ArrayKlass::print_on(outputStream* st) const { |
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204 assert(is_klass(), "must be klass"); |
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205 Klass::print_on(st); |
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206 } |
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207 |
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208 void ArrayKlass::print_value_on(outputStream* st) const { |
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209 assert(is_klass(), "must be klass"); |
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210 for(int index = 0; index < dimension(); index++) { |
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211 st->print("[]"); |
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212 } |
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213 } |
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214 |
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215 void ArrayKlass::oop_print_on(oop obj, outputStream* st) { |
0 | 216 assert(obj->is_array(), "must be array"); |
217 Klass::oop_print_on(obj, st); | |
218 st->print_cr(" - length: %d", arrayOop(obj)->length()); | |
219 } | |
220 | |
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221 |
0 | 222 // Verification |
223 | |
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224 void ArrayKlass::verify_on(outputStream* st) { |
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225 Klass::verify_on(st); |
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226 |
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227 if (component_mirror() != NULL) { |
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228 guarantee(component_mirror()->klass() != NULL, "should have a class"); |
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229 } |
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230 } |
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231 |
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232 void ArrayKlass::oop_verify_on(oop obj, outputStream* st) { |
0 | 233 guarantee(obj->is_array(), "must be array"); |
234 arrayOop a = arrayOop(obj); | |
235 guarantee(a->length() >= 0, "array with negative length?"); | |
236 } |