1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "gc/shared/collectedHeap.hpp"
30 #include "gc/shared/collectedHeap.inline.hpp"
31 #include "memory/metadataFactory.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "memory/universe.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/instanceKlass.hpp"
36 #include "oops/klass.inline.hpp"
37 #include "oops/objArrayKlass.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "oops/arrayKlass.hpp"
40 #include "oops/arrayOop.hpp"
41 #include "oops/valueKlass.hpp"
42 #include "oops/valueArrayOop.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/orderAccess.inline.hpp"
45 #include "utilities/macros.hpp"
46
47 #include "oops/valueArrayKlass.hpp"
48
49 // Allocation...
50
51 ValueArrayKlass::ValueArrayKlass(KlassHandle element_klass_handle, Symbol* name) : ArrayKlass(name) {
52 Klass* k = element_klass_handle();
53 assert(k->is_value(), "Expected Value");
54 set_element_klass(ValueKlass::cast(k));
55 set_class_loader_data(k->class_loader_data());
56
57 set_layout_helper(array_layout_helper(element_klass()));
58 assert(is_array_klass(), "sanity");
59 assert(is_valueArray_klass(), "sanity");
60
61 CMH("tweak name symbol refcnt ?")
62 #ifndef PRODUCT
63 if (PrintValueArrayLayout) {
64 print();
65 }
66 #endif
67 }
68
69 ValueArrayKlass* ValueArrayKlass::allocate_klass(KlassHandle element_klass,
70 Symbol* name,
71 TRAPS) {
72 assert(ValueArrayFlatten, "Flatten array not allowed");
73 assert(ValueKlass::cast(element_klass())->is_atomic() || (!ValueArrayAtomicAccess), "Atomic by-default");
74
75 ClassLoaderData* loader_data = element_klass->class_loader_data();
76 int size = ArrayKlass::static_size(ValueArrayKlass::header_size());
77 ValueArrayKlass* vak = new (loader_data, size, THREAD) ValueArrayKlass(element_klass, name);
78 if (vak == NULL) {
79 return NULL;
80 }
81 loader_data->add_class(vak);
82 complete_create_array_klass(vak, vak->super(), CHECK_NULL);
83 return vak;
84 }
85
86 ValueArrayKlass* ValueArrayKlass::allocate_klass(KlassHandle element_klass, TRAPS) {
87 Symbol* name = ArrayKlass::create_element_klass_array_name(element_klass, CHECK_NULL);
88 return allocate_klass(element_klass, name, THREAD);
89 }
90
91 // Oops allocation...
92 oop ValueArrayKlass::allocate(int length, bool do_zero, TRAPS) {
93 CMH("this is virtually identical in all arrayKlasses, refactor")
94 if (length < 0) {
95 THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
96 }
97 if (length > max_elements()) {
98 report_java_out_of_memory("Requested array size exceeds VM limit");
99 JvmtiExport::post_array_size_exhausted();
100 THROW_OOP_0(Universe::out_of_memory_error_array_size());
101 }
102
103 size_t size = valueArrayOopDesc::object_size(layout_helper(), length);
104 KlassHandle h_k(THREAD, this);
105 if (do_zero) {
106 return CollectedHeap::array_allocate(h_k, (int)size, length, CHECK_NULL);
107 } else {
108 return CollectedHeap::array_allocate_nozero(h_k, (int)size, length, CHECK_NULL);
109 }
110 }
111
112
113 oop ValueArrayKlass::multi_allocate(int rank, jint* last_size, TRAPS) {
114 // For valueArrays this is only called for the last dimension
115 assert(rank == 1, "just checking");
116 int length = *last_size;
117 return allocate(length, true, THREAD);
118 }
119
120 jint ValueArrayKlass::array_layout_helper(ValueKlass* vk) {
121 BasicType etype = T_VALUETYPE;
122 int atag = _lh_array_tag_type_value;
123 int esize = upper_log2(vk->raw_value_byte_size());
124 int hsize = arrayOopDesc::base_offset_in_bytes(etype);
125
126 int lh = (atag << _lh_array_tag_shift)
127 | (1 << _lh_valuetype_bit)
128 | (hsize << _lh_header_size_shift)
129 | ((int)etype << _lh_element_type_shift)
130 | ((esize) << _lh_log2_element_size_shift);
131
132 #ifdef DEBUG
133 assert(lh < (int)_lh_neutral_value, "must look like an array layout");
134 assert(layout_helper_is_array(lh), "correct kind");
135 assert(layout_helper_is_valueArray(lh), "correct kind");
136 assert(layout_helper_header_size(lh) == hsize, "correct decode");
137 assert(layout_helper_element_type(lh) == etype, "correct decode");
138 assert(layout_helper_is_typeArray(lh), "correct kind");
139 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode");
140 #endif
141 return lh;
142 }
143
144 int ValueArrayKlass::oop_size(oop obj) const {
145 assert(obj->is_valueArray(),"must be a value array");
146 valueArrayOop array = valueArrayOop(obj);
147 return array->object_size();
148 }
149
150 jint ValueArrayKlass::max_elements() const {
151 return arrayOopDesc::max_array_length(arrayOopDesc::header_size(T_VALUETYPE), element_byte_size());
152 }
153
154 oop ValueArrayKlass::protection_domain() const {
155 return element_klass()->protection_domain();
156 }
157
158 void ValueArrayKlass::copy_array(arrayOop s, int src_pos,
159 arrayOop d, int dst_pos, int length, TRAPS) {
160 assert(s->is_valueArray(), "must be value array");
161
162 // Check destination
163 if (!d->is_valueArray() || element_klass() != ValueArrayKlass::cast(d->klass())->element_klass()) {
164 THROW(vmSymbols::java_lang_ArrayStoreException());
165 }
166
167 // Check is all offsets and lengths are non negative
168 if (src_pos < 0 || dst_pos < 0 || length < 0) {
169 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
170 }
171 // Check if the ranges are valid
172 if ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length())
173 || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) {
174 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
175 }
176 // Check zero copy
177 if (length == 0)
178 return;
179
180 valueArrayOop da = valueArrayOop(d);
181 valueArrayOop sa = valueArrayOop(s);
182 int end_src_pos = src_pos + length;
183 while (src_pos < end_src_pos) {
184 element_klass()->value_store(sa->value_at_addr(src_pos++, layout_helper()),
185 da->value_at_addr(dst_pos++, layout_helper()),
186 true,
187 false);
188 }
189 }
190
191
192 Klass* ValueArrayKlass::array_klass_impl(bool or_null, int n, TRAPS) {
193
194 assert(dimension() <= n, "check order of chain");
195 int dim = dimension();
196 if (dim == n) return this;
197
198 if (higher_dimension() == NULL) {
199 if (or_null) return NULL;
200
201 ResourceMark rm;
202 JavaThread *jt = (JavaThread *)THREAD;
203 {
204 MutexLocker mc(Compile_lock, THREAD); // for vtables
205 // Ensure atomic creation of higher dimensions
206 MutexLocker mu(MultiArray_lock, THREAD);
207
208 // Check if another thread beat us
209 if (higher_dimension() == NULL) {
210
211 // Create multi-dim klass object and link them together
212 Klass* k =
213 ObjArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this, CHECK_NULL);
214 ObjArrayKlass* ak = ObjArrayKlass::cast(k);
215 ak->set_lower_dimension(this);
216 OrderAccess::storestore();
217 set_higher_dimension(ak);
218 assert(ak->is_objArray_klass(), "incorrect initialization of ObjArrayKlass");
219 }
220 }
221 } else {
222 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
223 }
224
225 ObjArrayKlass *ak = ObjArrayKlass::cast(higher_dimension());
226 if (or_null) {
227 return ak->array_klass_or_null(n);
228 }
229 return ak->array_klass(n, THREAD);
230 }
231
232 Klass* ValueArrayKlass::array_klass_impl(bool or_null, TRAPS) {
233 return array_klass_impl(or_null, dimension() + 1, THREAD);
234 }
235
236 void ValueArrayKlass::print_on(outputStream* st) const {
237 #ifndef PRODUCT
238 assert(!is_objArray_klass(), "Unimplemented");
239
240 st->print("Value Type Array: ");
241 Klass::print_on(st);
242
243 st->print(" - element klass: ");
244 element_klass()->print_value_on(st);
245 st->cr();
246
247 int elem_size = element_byte_size();
248 st->print(" - element size %i ", elem_size);
249 st->print("aligned layout size %i", 1 << layout_helper_log2_element_size(layout_helper()));
250 st->cr();
251 #endif //PRODUCT
252 }
253
254 #ifndef PRODUCT
255 void ValueArrayKlass::oop_print_on(oop obj, outputStream* st) {
256 ArrayKlass::oop_print_on(obj, st);
257 valueArrayOop va = valueArrayOop(obj);
258 ValueKlass* vk = element_klass();
259 int print_len = MIN2((intx) va->length(), MaxElementPrintSize);
260 for(int index = 0; index < print_len; index++) {
261 st->print_cr(" - %d : ", index);
262 oop obj = (oop) ((address)va->value_at_addr(index, layout_helper()) - vk->first_field_offset());
263 FieldPrinter print_field(st, obj);
264 vk->do_nonstatic_fields(&print_field);
265 st->cr();
266 }
267 int remaining = va->length() - print_len;
268 if (remaining > 0) {
269 st->print_cr(" - <%d more elements, increase MaxElementPrintSize to print>", remaining);
270 }
271 }
272 #endif //PRODUCT
273