1 /*
2 * Copyright (c) 2017, 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 "oops/verifyOopClosure.hpp"
44 #include "runtime/handles.inline.hpp"
45 #include "runtime/orderAccess.inline.hpp"
46 #include "utilities/macros.hpp"
47
48 #include "oops/valueArrayKlass.hpp"
49
50 // Allocation...
51
52 ValueArrayKlass::ValueArrayKlass(KlassHandle element_klass_handle, Symbol* name) : ArrayKlass(name) {
53 Klass* k = element_klass_handle();
54 assert(k->is_value(), "Expected Value");
55
56 set_element_klass(ValueKlass::cast(k));
57 set_class_loader_data(k->class_loader_data());
58 set_layout_helper(array_layout_helper(element_klass()));
59
60 assert((1 << Klass::layout_helper_log2_element_size(layout_helper())) >=
61 element_value_store_size(), "sanity");
62 assert(is_array_klass(), "sanity");
63 assert(is_valueArray_klass(), "sanity");
64
65 CMH("tweak name symbol refcnt ?")
66 #ifndef PRODUCT
67 if (PrintValueArrayLayout) {
68 print();
69 }
70 #endif
71 }
72
73 void ValueArrayKlass::set_element_klass(ValueKlass* k) {
74 _element_klass = k;
75 _element_value_store_size = k->raw_value_byte_size();
76 }
77
78 ValueArrayKlass* ValueArrayKlass::allocate_klass(KlassHandle element_klass,
79 Symbol* name,
80 TRAPS) {
81 assert(ValueArrayFlatten, "Flatten array not allowed");
82 assert(ValueKlass::cast(element_klass())->is_atomic() || (!ValueArrayAtomicAccess), "Atomic by-default");
83
84 ClassLoaderData* loader_data = element_klass->class_loader_data();
85 int size = ArrayKlass::static_size(ValueArrayKlass::header_size());
86 ValueArrayKlass* vak = new (loader_data, size, THREAD) ValueArrayKlass(element_klass, name);
87 if (vak == NULL) {
88 return NULL;
89 }
90 loader_data->add_class(vak);
91 complete_create_array_klass(vak, vak->super(), CHECK_NULL);
92 return vak;
93 }
94
95 ValueArrayKlass* ValueArrayKlass::allocate_klass(KlassHandle element_klass, TRAPS) {
96 Symbol* name = ArrayKlass::create_element_klass_array_name(element_klass, CHECK_NULL);
97 return allocate_klass(element_klass, name, THREAD);
98 }
99
100 void ValueArrayKlass::initialize(TRAPS) {
101 element_klass()->initialize(THREAD);
102 }
103
104 // Oops allocation...
105 oop ValueArrayKlass::allocate(int length, bool do_zero, TRAPS) {
106 if (length < 0) {
107 THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
108 }
109 if (length > max_elements()) {
110 report_java_out_of_memory("Requested array size exceeds VM limit");
111 JvmtiExport::post_array_size_exhausted();
112 THROW_OOP_0(Universe::out_of_memory_error_array_size());
113 }
114
115 size_t size = valueArrayOopDesc::object_size(layout_helper(), length);
116 KlassHandle h_k(THREAD, this);
117 if (do_zero) {
118 return CollectedHeap::array_allocate(h_k, (int)size, length, CHECK_NULL);
119 } else {
120 return CollectedHeap::array_allocate_nozero(h_k, (int)size, length, CHECK_NULL);
121 }
122 }
123
124
125 oop ValueArrayKlass::multi_allocate(int rank, jint* last_size, TRAPS) {
126 // For valueArrays this is only called for the last dimension
127 assert(rank == 1, "just checking");
128 int length = *last_size;
129 return allocate(length, true, THREAD);
130 }
131
132 jint ValueArrayKlass::array_layout_helper(ValueKlass* vk) {
133 BasicType etype = T_VALUETYPE;
134 int atag = _lh_array_tag_vt_value;
135 int esize = upper_log2(vk->raw_value_byte_size());
136 int hsize = arrayOopDesc::base_offset_in_bytes(etype);
137
138 int lh = (atag << _lh_array_tag_shift)
139 | (hsize << _lh_header_size_shift)
140 | ((int)etype << _lh_element_type_shift)
141 | ((esize) << _lh_log2_element_size_shift);
142
143 assert(lh < (int)_lh_neutral_value, "must look like an array layout");
144 assert(layout_helper_is_array(lh), "correct kind");
145 assert(layout_helper_is_valueArray(lh), "correct kind");
146 assert(!layout_helper_is_typeArray(lh), "correct kind");
147 assert(!layout_helper_is_objArray(lh), "correct kind");
148 assert(layout_helper_header_size(lh) == hsize, "correct decode");
149 assert(layout_helper_element_type(lh) == etype, "correct decode");
150 assert(layout_helper_log2_element_size(lh) == esize, "correct decode");
151 assert((1 << esize) < BytesPerLong || is_size_aligned(hsize, HeapWordsPerLong), "unaligned base");
152
153 return lh;
154 }
155
156 int ValueArrayKlass::oop_size(oop obj) const {
157 assert(obj->is_valueArray(),"must be a value array");
158 valueArrayOop array = valueArrayOop(obj);
159 return array->object_size();
160 }
161
162 jint ValueArrayKlass::max_elements() const {
163 return arrayOopDesc::max_array_length(arrayOopDesc::header_size(T_VALUETYPE), element_byte_size());
164 }
165
166 oop ValueArrayKlass::protection_domain() const {
167 return element_klass()->protection_domain();
168 }
169
170 void ValueArrayKlass::copy_array(arrayOop s, int src_pos,
171 arrayOop d, int dst_pos, int length, TRAPS) {
172 assert(s->is_valueArray(), "must be value array");
173
174 // Check destination
175 if (!d->is_valueArray() || element_klass() != ValueArrayKlass::cast(d->klass())->element_klass()) {
176 THROW(vmSymbols::java_lang_ArrayStoreException());
177 }
178
179 // Check is all offsets and lengths are non negative
180 if (src_pos < 0 || dst_pos < 0 || length < 0) {
181 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
182 }
183 // Check if the ranges are valid
184 if ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length())
185 || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) {
186 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
187 }
188 // Check zero copy
189 if (length == 0)
190 return;
191
192 valueArrayOop sa = valueArrayOop(s);
193 valueArrayOop da = valueArrayOop(d);
194 address src = (address) sa->value_at_addr(src_pos, layout_helper());
195 address dst = (address) da->value_at_addr(dst_pos, layout_helper());
196 if (contains_oops()) {
197 int elem_incr = 1 << log2_element_size();
198 address src_end = src + (length << log2_element_size());
199 while (src < src_end) {
200 element_klass()->value_store(src, dst, element_value_store_size(), true, false);
201 src += elem_incr;
202 dst += elem_incr;
203 }
204 } else {
205 // we are basically a type array...don't bother limiting element copy
206 // it would have to be a lot wasted space to be worth value_store() calls, need a setting here ?
207 Copy::conjoint_memory_atomic(src, dst, (size_t)length << log2_element_size());
208 }
209 }
210
211
212 Klass* ValueArrayKlass::array_klass_impl(bool or_null, int n, TRAPS) {
213
214 assert(dimension() <= n, "check order of chain");
215 int dim = dimension();
216 if (dim == n) return this;
217
218 if (higher_dimension() == NULL) {
219 if (or_null) return NULL;
220
221 ResourceMark rm;
222 JavaThread *jt = (JavaThread *)THREAD;
223 {
224 MutexLocker mc(Compile_lock, THREAD); // for vtables
225 // Ensure atomic creation of higher dimensions
226 MutexLocker mu(MultiArray_lock, THREAD);
227
228 // Check if another thread beat us
229 if (higher_dimension() == NULL) {
230
231 // Create multi-dim klass object and link them together
232 Klass* k =
233 ObjArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this, CHECK_NULL);
234 ObjArrayKlass* ak = ObjArrayKlass::cast(k);
235 ak->set_lower_dimension(this);
236 OrderAccess::storestore();
237 set_higher_dimension(ak);
238 assert(ak->is_objArray_klass(), "incorrect initialization of ObjArrayKlass");
239 }
240 }
241 } else {
242 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
243 }
244
245 ObjArrayKlass *ak = ObjArrayKlass::cast(higher_dimension());
246 if (or_null) {
247 return ak->array_klass_or_null(n);
248 }
249 return ak->array_klass(n, THREAD);
250 }
251
252 Klass* ValueArrayKlass::array_klass_impl(bool or_null, TRAPS) {
253 return array_klass_impl(or_null, dimension() + 1, THREAD);
254 }
255
256 void ValueArrayKlass::print_on(outputStream* st) const {
257 #ifndef PRODUCT
258 assert(!is_objArray_klass(), "Unimplemented");
259
260 st->print("Value Type Array: ");
261 Klass::print_on(st);
262
263 st->print(" - element klass: ");
264 element_klass()->print_value_on(st);
265 st->cr();
266
267 int elem_size = element_byte_size();
268 st->print(" - element size %i ", elem_size);
269 st->print("aligned layout size %i", 1 << layout_helper_log2_element_size(layout_helper()));
270 st->cr();
271 #endif //PRODUCT
272 }
273
274 void ValueArrayKlass::print_value_on(outputStream* st) const {
275 assert(is_klass(), "must be klass");
276
277 element_klass()->print_value_on(st);
278 st->print("[]");
279 }
280
281
282 #ifndef PRODUCT
283 void ValueArrayKlass::oop_print_on(oop obj, outputStream* st) {
284 ArrayKlass::oop_print_on(obj, st);
285 valueArrayOop va = valueArrayOop(obj);
286 ValueKlass* vk = element_klass();
287 int print_len = MIN2((intx) va->length(), MaxElementPrintSize);
288 for(int index = 0; index < print_len; index++) {
289 int off = (address) va->value_at_addr(index, layout_helper()) - (address) obj;
290 st->print_cr(" - Index %3d offset %3d: ", index, off);
291 oop obj = (oop) ((address)va->value_at_addr(index, layout_helper()) - vk->first_field_offset());
292 FieldPrinter print_field(st, obj);
293 vk->do_nonstatic_fields(&print_field);
294 st->cr();
295 }
296 int remaining = va->length() - print_len;
297 if (remaining > 0) {
298 st->print_cr(" - <%d more elements, increase MaxElementPrintSize to print>", remaining);
299 }
300 }
301 #endif //PRODUCT
302
303 void ValueArrayKlass::oop_print_value_on(oop obj, outputStream* st) {
304 assert(obj->is_valueArray(), "must be valueArray");
305 st->print("a ");
306 element_klass()->print_value_on(st);
307 int len = valueArrayOop(obj)->length();
308 st->print("[%d] ", len);
309 obj->print_address_on(st);
310 if (NOT_PRODUCT(PrintOopAddress ||) PrintMiscellaneous && (WizardMode || Verbose)) {
311 int lh = layout_helper();
312 st->print("{");
313 for (int i = 0; i < len; i++) {
314 if (i > 4) {
315 st->print("..."); break;
316 }
317 st->print(" " INTPTR_FORMAT, (intptr_t)(void*)valueArrayOop(obj)->value_at_addr(i , lh));
318 }
319 st->print(" }");
320 }
321 }
322
323 // Verification
324
325 void ValueArrayKlass::oop_verify_on(oop obj, outputStream* st) {
326 ArrayKlass::oop_verify_on(obj, st);
327 guarantee(obj->is_valueArray(), "must be valueArray");
328
329 if (element_klass()->contains_oops()) {
330 valueArrayOop va = valueArrayOop(obj);
331 NoHeaderExtendedOopClosure wrapClosure(&VerifyOopClosure::verify_oop);
332 va->oop_iterate(&wrapClosure);
333 }
334 }
335
336 void ValueArrayKlass::verify_on(outputStream* st) {
337 ArrayKlass::verify_on(st);
338 guarantee(element_klass()->is_value(), "should be value type klass");
339 }