1 /*
2 * Copyright (c) 2017, 2025, 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 "cds/archiveUtils.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/codeCache.hpp"
30 #include "gc/shared/barrierSet.hpp"
31 #include "gc/shared/collectedHeap.inline.hpp"
32 #include "gc/shared/gcLocker.inline.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "logging/log.hpp"
35 #include "memory/metaspaceClosure.hpp"
36 #include "memory/metadataFactory.hpp"
37 #include "oops/access.hpp"
38 #include "oops/compressedOops.inline.hpp"
39 #include "oops/fieldStreams.inline.hpp"
40 #include "oops/flatArrayKlass.hpp"
41 #include "oops/inlineKlass.inline.hpp"
42 #include "oops/instanceKlass.inline.hpp"
43 #include "oops/method.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "runtime/fieldDescriptor.inline.hpp"
47 #include "runtime/handles.inline.hpp"
48 #include "runtime/safepointVerifiers.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/signature.hpp"
51 #include "runtime/thread.inline.hpp"
52 #include "utilities/copy.hpp"
53
54 // Constructor
55 InlineKlass::InlineKlass(const ClassFileParser& parser)
56 : InstanceKlass(parser, InlineKlass::Kind) {
57 set_prototype_header(markWord::inline_type_prototype());
58 assert(is_inline_klass(), "sanity");
59 assert(prototype_header().is_inline_type(), "sanity");
60 }
61
62 InlineKlass::InlineKlass() {
63 assert(CDSConfig::is_dumping_archive() || UseSharedSpaces, "only for CDS");
64 }
65
66 void InlineKlass::init_fixed_block() {
67 _adr_inlineklass_fixed_block = inlineklass_static_block();
68 // Addresses used for inline type calling convention
69 *((Array<SigEntry>**)adr_extended_sig()) = nullptr;
70 *((Array<VMRegPair>**)adr_return_regs()) = nullptr;
71 *((address*)adr_pack_handler()) = nullptr;
72 *((address*)adr_pack_handler_jobject()) = nullptr;
73 *((address*)adr_unpack_handler()) = nullptr;
74 assert(pack_handler() == nullptr, "pack handler not null");
75 *((address*)adr_non_atomic_flat_array_klass()) = nullptr;
76 *((address*)adr_atomic_flat_array_klass()) = nullptr;
77 *((address*)adr_nullable_atomic_flat_array_klass()) = nullptr;
78 *((address*)adr_null_free_reference_array_klass()) = nullptr;
79 set_default_value_offset(0);
80 set_null_reset_value_offset(0);
81 set_first_field_offset(-1);
82 set_payload_size_in_bytes(-1);
83 set_payload_alignment(-1);
84 set_non_atomic_size_in_bytes(-1);
85 set_non_atomic_alignment(-1);
86 set_atomic_size_in_bytes(-1);
87 set_nullable_size_in_bytes(-1);
88 set_null_marker_offset(-1);
89 }
90
91 void InlineKlass::set_default_value(oop val) {
92 assert(val != nullptr, "Sanity check");
93 assert(oopDesc::is_oop(val), "Sanity check");
94 assert(val->is_inline_type(), "Sanity check");
95 assert(val->klass() == this, "sanity check");
96 java_mirror()->obj_field_put(default_value_offset(), val);
97 }
98
99 void InlineKlass::set_null_reset_value(oop val) {
100 assert(val != nullptr, "Sanity check");
101 assert(oopDesc::is_oop(val), "Sanity check");
102 assert(val->is_inline_type(), "Sanity check");
103 assert(val->klass() == this, "sanity check");
104 java_mirror()->obj_field_put(null_reset_value_offset(), val);
105 }
106
107 instanceOop InlineKlass::allocate_instance(TRAPS) {
108 int size = size_helper(); // Query before forming handle.
109
110 instanceOop oop = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
111 assert(oop->mark().is_inline_type(), "Expected inline type");
112 return oop;
113 }
114
115 instanceOop InlineKlass::allocate_instance_buffer(TRAPS) {
116 int size = size_helper(); // Query before forming handle.
117
118 instanceOop oop = (instanceOop)Universe::heap()->obj_buffer_allocate(this, size, CHECK_NULL);
119 assert(oop->mark().is_inline_type(), "Expected inline type");
120 return oop;
121 }
122
123 int InlineKlass::nonstatic_oop_count() {
124 int oops = 0;
125 int map_count = nonstatic_oop_map_count();
126 OopMapBlock* block = start_of_nonstatic_oop_maps();
127 OopMapBlock* end = block + map_count;
128 while (block != end) {
129 oops += block->count();
130 block++;
131 }
132 return oops;
133 }
134
135 int InlineKlass::layout_size_in_bytes(LayoutKind kind) const {
136 switch(kind) {
137 case LayoutKind::NON_ATOMIC_FLAT:
138 assert(has_non_atomic_layout(), "Layout not available");
139 return non_atomic_size_in_bytes();
140 break;
141 case LayoutKind::ATOMIC_FLAT:
142 assert(has_atomic_layout(), "Layout not available");
143 return atomic_size_in_bytes();
144 break;
145 case LayoutKind::NULLABLE_ATOMIC_FLAT:
146 assert(has_nullable_atomic_layout(), "Layout not available");
147 return nullable_atomic_size_in_bytes();
148 break;
149 case PAYLOAD:
150 return payload_size_in_bytes();
151 break;
152 default:
153 ShouldNotReachHere();
154 }
155 }
156
157 int InlineKlass::layout_alignment(LayoutKind kind) const {
158 switch(kind) {
159 case LayoutKind::NON_ATOMIC_FLAT:
160 assert(has_non_atomic_layout(), "Layout not available");
161 return non_atomic_alignment();
162 break;
163 case LayoutKind::ATOMIC_FLAT:
164 assert(has_atomic_layout(), "Layout not available");
165 return atomic_size_in_bytes();
166 break;
167 case LayoutKind::NULLABLE_ATOMIC_FLAT:
168 assert(has_nullable_atomic_layout(), "Layout not available");
169 return nullable_atomic_size_in_bytes();
170 break;
171 case LayoutKind::PAYLOAD:
172 return payload_alignment();
173 break;
174 default:
175 ShouldNotReachHere();
176 }
177 }
178
179 bool InlineKlass::is_layout_supported(LayoutKind lk) {
180 switch(lk) {
181 case LayoutKind::NON_ATOMIC_FLAT:
182 return has_non_atomic_layout();
183 break;
184 case LayoutKind::ATOMIC_FLAT:
185 return has_atomic_layout();
186 break;
187 case LayoutKind::NULLABLE_ATOMIC_FLAT:
188 return has_nullable_atomic_layout();
189 break;
190 case LayoutKind::PAYLOAD:
191 return true;
192 break;
193 default:
194 ShouldNotReachHere();
195 }
196 }
197
198 void InlineKlass::copy_payload_to_addr(void* src, void* dst, LayoutKind lk, bool dest_is_initialized) {
199 assert(is_layout_supported(lk), "Unsupported layout");
200 assert(lk != LayoutKind::REFERENCE && lk != LayoutKind::UNKNOWN, "Sanity check");
201 switch(lk) {
202 case NULLABLE_ATOMIC_FLAT: {
203 if (is_payload_marked_as_null((address)src)) {
204 if (!contains_oops()) {
205 mark_payload_as_null((address)dst);
206 return;
207 }
208 // copy null_reset value to dest
209 if (dest_is_initialized) {
210 HeapAccess<>::value_copy(data_for_oop(null_reset_value()), dst, this, lk);
211 } else {
212 HeapAccess<IS_DEST_UNINITIALIZED>::value_copy(data_for_oop(null_reset_value()), dst, this, lk);
213 }
214 } else {
215 // Copy has to be performed, even if this is an empty value, because of the null marker
216 mark_payload_as_non_null((address)src);
217 if (dest_is_initialized) {
218 HeapAccess<>::value_copy(src, dst, this, lk);
219 } else {
220 HeapAccess<IS_DEST_UNINITIALIZED>::value_copy(src, dst, this, lk);
221 }
222 }
223 }
224 break;
225 case PAYLOAD:
226 case ATOMIC_FLAT:
227 case NON_ATOMIC_FLAT: {
228 if (is_empty_inline_type()) return; // nothing to do
229 if (dest_is_initialized) {
230 HeapAccess<>::value_copy(src, dst, this, lk);
231 } else {
232 HeapAccess<IS_DEST_UNINITIALIZED>::value_copy(src, dst, this, lk);
233 }
234 }
235 break;
236 default:
237 ShouldNotReachHere();
238 }
239 }
240
241 oop InlineKlass::read_payload_from_addr(oop src, int offset, LayoutKind lk, TRAPS) {
242 assert(src != nullptr, "Must be");
243 assert(is_layout_supported(lk), "Unsupported layout");
244 switch(lk) {
245 case NULLABLE_ATOMIC_FLAT: {
246 if (is_payload_marked_as_null((address)((char*)(oopDesc*)src + offset))) {
247 return nullptr;
248 }
249 } // Fallthrough
250 case PAYLOAD:
251 case ATOMIC_FLAT:
252 case NON_ATOMIC_FLAT: {
253 if (is_empty_inline_type()) {
254 return default_value();
255 }
256 Handle obj_h(THREAD, src);
257 oop res = allocate_instance_buffer(CHECK_NULL);
258 copy_payload_to_addr((void*)((char*)(oopDesc*)obj_h() + offset), data_for_oop(res), lk, false);
259 if (lk == NULLABLE_ATOMIC_FLAT) {
260 if(is_payload_marked_as_null(data_for_oop(res))) {
261 return nullptr;
262 }
263 }
264 return res;
265 }
266 break;
267 default:
268 ShouldNotReachHere();
269 }
270 }
271
272 void InlineKlass::write_value_to_addr(oop src, void* dst, LayoutKind lk, bool dest_is_initialized, TRAPS) {
273 void* src_addr = nullptr;
274 if (src == nullptr) {
275 if (lk != NULLABLE_ATOMIC_FLAT) {
276 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Value is null");
277 }
278 src_addr = data_for_oop(null_reset_value());
279 } else {
280 src_addr = data_for_oop(src);
281 if (lk == NULLABLE_ATOMIC_FLAT) {
282 mark_payload_as_non_null((address)src_addr);
283 }
284 }
285 copy_payload_to_addr(src_addr, dst, lk, dest_is_initialized);
286 }
287
288 // Arrays of...
289
290 bool InlineKlass::flat_array() {
291 if (!UseFlatArray) {
292 return false;
293 }
294 // Too big
295 int elem_bytes = payload_size_in_bytes();
296 if ((FlatArrayElementMaxSize >= 0) && (elem_bytes > FlatArrayElementMaxSize)) {
297 return false;
298 }
299 // Too many embedded oops
300 if ((FlatArrayElementMaxOops >= 0) && (nonstatic_oop_count() > FlatArrayElementMaxOops)) {
301 return false;
302 }
303 // Declared atomic but not naturally atomic.
304 if (must_be_atomic() && !is_naturally_atomic()) {
305 return false;
306 }
307 // VM enforcing InlineArrayAtomicAccess only...
308 if (InlineArrayAtomicAccess && (!is_naturally_atomic())) {
309 return false;
310 }
311 return true;
312 }
313
314 ObjArrayKlass* InlineKlass::null_free_reference_array(TRAPS) {
315 if (Atomic::load_acquire(adr_null_free_reference_array_klass()) == nullptr) {
316 // Atomic creation of array_klasses
317 RecursiveLocker rl(MultiArray_lock, THREAD);
318
319 // Check if update has already taken place
320 if (null_free_reference_array_klass() == nullptr) {
321 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, true, CHECK_NULL);
322
323 // use 'release' to pair with lock-free load
324 Atomic::release_store(adr_null_free_reference_array_klass(), k);
325 }
326 }
327 return null_free_reference_array_klass();
328 }
329
330
331 // There's no reason for this method to have a TRAP argument
332 FlatArrayKlass* InlineKlass::flat_array_klass(LayoutKind lk, TRAPS) {
333 FlatArrayKlass* volatile* adr_flat_array_klass = nullptr;
334 switch(lk) {
335 case NON_ATOMIC_FLAT:
336 assert(has_non_atomic_layout(), "Must be");
337 adr_flat_array_klass = adr_non_atomic_flat_array_klass();
338 break;
339 case ATOMIC_FLAT:
340 assert(has_atomic_layout(), "Must be");
341 adr_flat_array_klass = adr_atomic_flat_array_klass();
342 break;
343 case NULLABLE_ATOMIC_FLAT:
344 assert(has_nullable_atomic_layout(), "Must be");
345 adr_flat_array_klass = adr_nullable_atomic_flat_array_klass();
346 break;
347 default:
348 ShouldNotReachHere();
349 }
350
351 if (Atomic::load_acquire(adr_flat_array_klass) == nullptr) {
352 // Atomic creation of array_klasses
353 RecursiveLocker rl(MultiArray_lock, THREAD);
354
355 if (*adr_flat_array_klass == nullptr) {
356 FlatArrayKlass* k = FlatArrayKlass::allocate_klass(this, lk, CHECK_NULL);
357 Atomic::release_store(adr_flat_array_klass, k);
358 }
359 }
360 return *adr_flat_array_klass;
361 }
362
363 FlatArrayKlass* InlineKlass::flat_array_klass_or_null(LayoutKind lk) {
364 FlatArrayKlass* volatile* adr_flat_array_klass = nullptr;
365 switch(lk) {
366 case NON_ATOMIC_FLAT:
367 assert(has_non_atomic_layout(), "Must be");
368 adr_flat_array_klass = adr_non_atomic_flat_array_klass();
369 break;
370 case ATOMIC_FLAT:
371 assert(has_atomic_layout(), "Must be");
372 adr_flat_array_klass = adr_atomic_flat_array_klass();
373 break;
374 case NULLABLE_ATOMIC_FLAT:
375 assert(has_nullable_atomic_layout(), "Must be");
376 adr_flat_array_klass = adr_nullable_atomic_flat_array_klass();
377 break;
378 default:
379 ShouldNotReachHere();
380 }
381
382 // Need load-acquire for lock-free read
383 FlatArrayKlass* k = Atomic::load_acquire(adr_flat_array_klass);
384 return k;
385 }
386
387 // Inline type arguments are not passed by reference, instead each
388 // field of the inline type is passed as an argument. This helper
389 // function collects the flat field (recursively)
390 // in a list. Included with the field's type is
391 // the offset of each field in the inline type: i2c and c2i adapters
392 // need that to load or store fields. Finally, the list of fields is
393 // sorted in order of increasing offsets: the adapters and the
394 // compiled code need to agree upon the order of fields.
395 //
396 // The list of basic types that is returned starts with a T_METADATA
397 // and ends with an extra T_VOID. T_METADATA/T_VOID pairs are used as
398 // delimiters. Every entry between the two is a field of the inline
399 // type. If there's an embedded inline type in the list, it also starts
400 // with a T_METADATA and ends with a T_VOID. This is so we can
401 // generate a unique fingerprint for the method's adapters and we can
402 // generate the list of basic types from the interpreter point of view
403 // (inline types passed as reference: iterate on the list until a
404 // T_METADATA, drop everything until and including the closing
405 // T_VOID) or the compiler point of view (each field of the inline
406 // types is an argument: drop all T_METADATA/T_VOID from the list).
407 //
408 // Value classes could also have fields in abstract super value classes.
409 // Use a HierarchicalFieldStream to get them as well.
410 int InlineKlass::collect_fields(GrowableArray<SigEntry>* sig, int base_off) {
411 int count = 0;
412 SigEntry::add_entry(sig, T_METADATA, name(), base_off);
413 for (HierarchicalFieldStream<JavaFieldStream> fs(this); !fs.done(); fs.next()) {
414 if (fs.access_flags().is_static()) continue;
415 int offset = base_off + fs.offset() - (base_off > 0 ? first_field_offset() : 0);
416 // TODO 8284443 Use different heuristic to decide what should be scalarized in the calling convention
417 if (fs.is_flat()) {
418 // Resolve klass of flat field and recursively collect fields
419 Klass* vk = get_inline_type_field_klass(fs.index());
420 count += InlineKlass::cast(vk)->collect_fields(sig, offset);
421 } else {
422 BasicType bt = Signature::basic_type(fs.signature());
423 SigEntry::add_entry(sig, bt, fs.signature(), offset);
424 count += type2size[bt];
425 }
426 }
427 int offset = base_off + size_helper()*HeapWordSize - (base_off > 0 ? first_field_offset() : 0);
428 SigEntry::add_entry(sig, T_VOID, name(), offset);
429 if (base_off == 0) {
430 sig->sort(SigEntry::compare);
431 }
432 assert(sig->at(0)._bt == T_METADATA && sig->at(sig->length()-1)._bt == T_VOID, "broken structure");
433 return count;
434 }
435
436 void InlineKlass::initialize_calling_convention(TRAPS) {
437 // Because the pack and unpack handler addresses need to be loadable from generated code,
438 // they are stored at a fixed offset in the klass metadata. Since inline type klasses do
439 // not have a vtable, the vtable offset is used to store these addresses.
440 if (InlineTypeReturnedAsFields || InlineTypePassFieldsAsArgs) {
441 ResourceMark rm;
442 GrowableArray<SigEntry> sig_vk;
443 int nb_fields = collect_fields(&sig_vk);
444 Array<SigEntry>* extended_sig = MetadataFactory::new_array<SigEntry>(class_loader_data(), sig_vk.length(), CHECK);
445 *((Array<SigEntry>**)adr_extended_sig()) = extended_sig;
446 for (int i = 0; i < sig_vk.length(); i++) {
447 extended_sig->at_put(i, sig_vk.at(i));
448 }
449 if (can_be_returned_as_fields(/* init= */ true)) {
450 nb_fields++;
451 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, nb_fields);
452 sig_bt[0] = T_METADATA;
453 SigEntry::fill_sig_bt(&sig_vk, sig_bt+1);
454 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, nb_fields);
455 int total = SharedRuntime::java_return_convention(sig_bt, regs, nb_fields);
456
457 if (total > 0) {
458 Array<VMRegPair>* return_regs = MetadataFactory::new_array<VMRegPair>(class_loader_data(), nb_fields, CHECK);
459 *((Array<VMRegPair>**)adr_return_regs()) = return_regs;
460 for (int i = 0; i < nb_fields; i++) {
461 return_regs->at_put(i, regs[i]);
462 }
463
464 BufferedInlineTypeBlob* buffered_blob = SharedRuntime::generate_buffered_inline_type_adapter(this);
465 *((address*)adr_pack_handler()) = buffered_blob->pack_fields();
466 *((address*)adr_pack_handler_jobject()) = buffered_blob->pack_fields_jobject();
467 *((address*)adr_unpack_handler()) = buffered_blob->unpack_fields();
468 assert(CodeCache::find_blob(pack_handler()) == buffered_blob, "lost track of blob");
469 assert(can_be_returned_as_fields(), "sanity");
470 }
471 }
472 if (!can_be_returned_as_fields() && !can_be_passed_as_fields()) {
473 MetadataFactory::free_array<SigEntry>(class_loader_data(), extended_sig);
474 assert(return_regs() == nullptr, "sanity");
475 }
476 }
477 }
478
479 void InlineKlass::deallocate_contents(ClassLoaderData* loader_data) {
480 if (extended_sig() != nullptr) {
481 MetadataFactory::free_array<SigEntry>(loader_data, extended_sig());
482 *((Array<SigEntry>**)adr_extended_sig()) = nullptr;
483 }
484 if (return_regs() != nullptr) {
485 MetadataFactory::free_array<VMRegPair>(loader_data, return_regs());
486 *((Array<VMRegPair>**)adr_return_regs()) = nullptr;
487 }
488 cleanup_blobs();
489 InstanceKlass::deallocate_contents(loader_data);
490 }
491
492 void InlineKlass::cleanup(InlineKlass* ik) {
493 ik->cleanup_blobs();
494 }
495
496 void InlineKlass::cleanup_blobs() {
497 if (pack_handler() != nullptr) {
498 CodeBlob* buffered_blob = CodeCache::find_blob(pack_handler());
499 assert(buffered_blob->is_buffered_inline_type_blob(), "bad blob type");
500 BufferBlob::free((BufferBlob*)buffered_blob);
501 *((address*)adr_pack_handler()) = nullptr;
502 *((address*)adr_pack_handler_jobject()) = nullptr;
503 *((address*)adr_unpack_handler()) = nullptr;
504 }
505 }
506
507 // Can this inline type be passed as multiple values?
508 bool InlineKlass::can_be_passed_as_fields() const {
509 return InlineTypePassFieldsAsArgs;
510 }
511
512 // Can this inline type be returned as multiple values?
513 bool InlineKlass::can_be_returned_as_fields(bool init) const {
514 return InlineTypeReturnedAsFields && (init || return_regs() != nullptr);
515 }
516
517 // Create handles for all oop fields returned in registers that are going to be live across a safepoint
518 void InlineKlass::save_oop_fields(const RegisterMap& reg_map, GrowableArray<Handle>& handles) const {
519 Thread* thread = Thread::current();
520 const Array<SigEntry>* sig_vk = extended_sig();
521 const Array<VMRegPair>* regs = return_regs();
522 int j = 1;
523
524 for (int i = 0; i < sig_vk->length(); i++) {
525 BasicType bt = sig_vk->at(i)._bt;
526 if (bt == T_OBJECT || bt == T_ARRAY) {
527 VMRegPair pair = regs->at(j);
528 address loc = reg_map.location(pair.first(), nullptr);
529 oop v = *(oop*)loc;
530 assert(v == nullptr || oopDesc::is_oop(v), "not an oop?");
531 assert(Universe::heap()->is_in_or_null(v), "must be heap pointer");
532 handles.push(Handle(thread, v));
533 }
534 if (bt == T_METADATA) {
535 continue;
536 }
537 if (bt == T_VOID &&
538 sig_vk->at(i-1)._bt != T_LONG &&
539 sig_vk->at(i-1)._bt != T_DOUBLE) {
540 continue;
541 }
542 j++;
543 }
544 assert(j == regs->length(), "missed a field?");
545 }
546
547 // Update oop fields in registers from handles after a safepoint
548 void InlineKlass::restore_oop_results(RegisterMap& reg_map, GrowableArray<Handle>& handles) const {
549 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
550 const Array<SigEntry>* sig_vk = extended_sig();
551 const Array<VMRegPair>* regs = return_regs();
552 assert(regs != nullptr, "inconsistent");
553
554 int j = 1;
555 for (int i = 0, k = 0; i < sig_vk->length(); i++) {
556 BasicType bt = sig_vk->at(i)._bt;
557 if (bt == T_OBJECT || bt == T_ARRAY) {
558 VMRegPair pair = regs->at(j);
559 address loc = reg_map.location(pair.first(), nullptr);
560 *(oop*)loc = handles.at(k++)();
561 }
562 if (bt == T_METADATA) {
563 continue;
564 }
565 if (bt == T_VOID &&
566 sig_vk->at(i-1)._bt != T_LONG &&
567 sig_vk->at(i-1)._bt != T_DOUBLE) {
568 continue;
569 }
570 j++;
571 }
572 assert(j == regs->length(), "missed a field?");
573 }
574
575 // Fields are in registers. Create an instance of the inline type and
576 // initialize it with the values of the fields.
577 oop InlineKlass::realloc_result(const RegisterMap& reg_map, const GrowableArray<Handle>& handles, TRAPS) {
578 oop new_vt = allocate_instance(CHECK_NULL);
579 const Array<SigEntry>* sig_vk = extended_sig();
580 const Array<VMRegPair>* regs = return_regs();
581
582 int j = 1;
583 int k = 0;
584 for (int i = 0; i < sig_vk->length(); i++) {
585 BasicType bt = sig_vk->at(i)._bt;
586 if (bt == T_METADATA) {
587 continue;
588 }
589 if (bt == T_VOID) {
590 if (sig_vk->at(i-1)._bt == T_LONG ||
591 sig_vk->at(i-1)._bt == T_DOUBLE) {
592 j++;
593 }
594 continue;
595 }
596 int off = sig_vk->at(i)._offset;
597 assert(off > 0, "offset in object should be positive");
598 VMRegPair pair = regs->at(j);
599 address loc = reg_map.location(pair.first(), nullptr);
600 switch(bt) {
601 case T_BOOLEAN: {
602 new_vt->bool_field_put(off, *(jboolean*)loc);
603 break;
604 }
605 case T_CHAR: {
606 new_vt->char_field_put(off, *(jchar*)loc);
607 break;
608 }
609 case T_BYTE: {
610 new_vt->byte_field_put(off, *(jbyte*)loc);
611 break;
612 }
613 case T_SHORT: {
614 new_vt->short_field_put(off, *(jshort*)loc);
615 break;
616 }
617 case T_INT: {
618 new_vt->int_field_put(off, *(jint*)loc);
619 break;
620 }
621 case T_LONG: {
622 #ifdef _LP64
623 new_vt->double_field_put(off, *(jdouble*)loc);
624 #else
625 Unimplemented();
626 #endif
627 break;
628 }
629 case T_OBJECT:
630 case T_ARRAY: {
631 Handle handle = handles.at(k++);
632 new_vt->obj_field_put(off, handle());
633 break;
634 }
635 case T_FLOAT: {
636 new_vt->float_field_put(off, *(jfloat*)loc);
637 break;
638 }
639 case T_DOUBLE: {
640 new_vt->double_field_put(off, *(jdouble*)loc);
641 break;
642 }
643 default:
644 ShouldNotReachHere();
645 }
646 *(intptr_t*)loc = 0xDEAD;
647 j++;
648 }
649 assert(j == regs->length(), "missed a field?");
650 assert(k == handles.length(), "missed an oop?");
651 return new_vt;
652 }
653
654 // Check the return register for an InlineKlass oop
655 InlineKlass* InlineKlass::returned_inline_klass(const RegisterMap& map) {
656 BasicType bt = T_METADATA;
657 VMRegPair pair;
658 int nb = SharedRuntime::java_return_convention(&bt, &pair, 1);
659 assert(nb == 1, "broken");
660
661 address loc = map.location(pair.first(), nullptr);
662 intptr_t ptr = *(intptr_t*)loc;
663 if (is_set_nth_bit(ptr, 0)) {
664 // Return value is tagged, must be an InlineKlass pointer
665 clear_nth_bit(ptr, 0);
666 assert(Metaspace::contains((void*)ptr), "should be klass");
667 InlineKlass* vk = (InlineKlass*)ptr;
668 assert(vk->can_be_returned_as_fields(), "must be able to return as fields");
669 return vk;
670 }
671 // Return value is not tagged, must be a valid oop
672 assert(oopDesc::is_oop_or_null(cast_to_oop(ptr), true),
673 "Bad oop return: " PTR_FORMAT, ptr);
674 return nullptr;
675 }
676
677 // CDS support
678
679 void InlineKlass::metaspace_pointers_do(MetaspaceClosure* it) {
680 InstanceKlass::metaspace_pointers_do(it);
681
682 InlineKlass* this_ptr = this;
683 it->push((Klass**)adr_non_atomic_flat_array_klass());
684 it->push((Klass**)adr_atomic_flat_array_klass());
685 it->push((Klass**)adr_nullable_atomic_flat_array_klass());
686 it->push((Klass**)adr_null_free_reference_array_klass());
687 }
688
689 void InlineKlass::remove_unshareable_info() {
690 InstanceKlass::remove_unshareable_info();
691
692 // update it to point to the "buffered" copy of this class.
693 _adr_inlineklass_fixed_block = inlineklass_static_block();
694 ArchivePtrMarker::mark_pointer((address*)&_adr_inlineklass_fixed_block);
695
696 *((Array<SigEntry>**)adr_extended_sig()) = nullptr;
697 *((Array<VMRegPair>**)adr_return_regs()) = nullptr;
698 *((address*)adr_pack_handler()) = nullptr;
699 *((address*)adr_pack_handler_jobject()) = nullptr;
700 *((address*)adr_unpack_handler()) = nullptr;
701 assert(pack_handler() == nullptr, "pack handler not null");
702 if (non_atomic_flat_array_klass() != nullptr) {
703 non_atomic_flat_array_klass()->remove_unshareable_info();
704 }
705 if (atomic_flat_array_klass() != nullptr) {
706 atomic_flat_array_klass()->remove_unshareable_info();
707 }
708 if (nullable_atomic_flat_array_klass() != nullptr) {
709 nullable_atomic_flat_array_klass()->remove_unshareable_info();
710 }
711 if (null_free_reference_array_klass() != nullptr) {
712 null_free_reference_array_klass()->remove_unshareable_info();
713 }
714 }
715
716 void InlineKlass::remove_java_mirror() {
717 InstanceKlass::remove_java_mirror();
718 if (non_atomic_flat_array_klass() != nullptr) {
719 non_atomic_flat_array_klass()->remove_java_mirror();
720 }
721 if (atomic_flat_array_klass() != nullptr) {
722 atomic_flat_array_klass()->remove_java_mirror();
723 }
724 if (nullable_atomic_flat_array_klass() != nullptr) {
725 nullable_atomic_flat_array_klass()->remove_java_mirror();
726 }
727 if (null_free_reference_array_klass() != nullptr) {
728 null_free_reference_array_klass()->remove_java_mirror();
729 }
730 }
731
732 void InlineKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS) {
733 InstanceKlass::restore_unshareable_info(loader_data, protection_domain, pkg_entry, CHECK);
734 if (non_atomic_flat_array_klass() != nullptr) {
735 non_atomic_flat_array_klass()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
736 }
737 if (atomic_flat_array_klass() != nullptr) {
738 atomic_flat_array_klass()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
739 }
740 if (nullable_atomic_flat_array_klass() != nullptr) {
741 nullable_atomic_flat_array_klass()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
742 }
743 if (null_free_reference_array_klass() != nullptr) {
744 null_free_reference_array_klass()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
745 }
746 }
747
748 // oop verify
749
750 void InlineKlass::verify_on(outputStream* st) {
751 InstanceKlass::verify_on(st);
752 guarantee(prototype_header().is_inline_type(), "Prototype header is not inline type");
753 }
754
755 void InlineKlass::oop_verify_on(oop obj, outputStream* st) {
756 InstanceKlass::oop_verify_on(obj, st);
757 guarantee(obj->mark().is_inline_type(), "Header is not inline type");
758 }