1 /*
2 * Copyright (c) 2017, 2026, 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 "cds/archiveUtils.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/codeCache.hpp"
29 #include "gc/shared/barrierSet.hpp"
30 #include "gc/shared/collectedHeap.inline.hpp"
31 #include "gc/shared/gcLocker.inline.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "logging/log.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/metaspaceClosure.hpp"
36 #include "oops/access.hpp"
37 #include "oops/arrayKlass.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/objArrayKlass.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "oops/refArrayKlass.hpp"
47 #include "runtime/fieldDescriptor.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/registerMap.hpp"
50 #include "runtime/safepointVerifiers.hpp"
51 #include "runtime/sharedRuntime.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/thread.inline.hpp"
54 #include "utilities/copy.hpp"
55 #include "utilities/stringUtils.hpp"
56
57 InlineKlass::Members::Members()
58 : _extended_sig(nullptr),
59 _return_regs(nullptr),
60 _pack_handler(nullptr),
61 _pack_handler_jobject(nullptr),
62 _unpack_handler(nullptr),
63 _null_reset_value_offset(0),
64 _payload_offset(-1),
65 _payload_size_in_bytes(-1),
66 _payload_alignment(-1),
67 _non_atomic_size_in_bytes(-1),
68 _non_atomic_alignment(-1),
69 _atomic_size_in_bytes(-1),
70 _nullable_size_in_bytes(-1),
71 _null_marker_offset(-1) {
72 }
73
74 InlineKlass::InlineKlass() {
75 assert(CDSConfig::is_dumping_archive() || UseSharedSpaces, "only for CDS");
76 }
77
78 // Constructor
79 InlineKlass::InlineKlass(const ClassFileParser& parser)
80 : InstanceKlass(parser, InlineKlass::Kind, markWord::inline_type_prototype()) {
81 assert(is_inline_klass(), "sanity");
82 assert(prototype_header().is_inline_type(), "sanity");
83
84 // Set up the offset to the members of this klass
85 _adr_inline_klass_members = calculate_members_address();
86
87 // Placement install the members
88 new (_adr_inline_klass_members) Members();
89
90 // Sanity check construction of the members
91 assert(pack_handler() == nullptr, "pack handler not null");
92 }
93
94 address InlineKlass::calculate_members_address() const {
95 // The members are placed after all other contents inherited from the InstanceKlass
96 return end_of_instance_klass();
97 }
98
99 oop InlineKlass::null_reset_value() {
100 assert(is_initialized() || is_being_initialized() || is_in_error_state(), "null reset value is set at the beginning of initialization");
101 oop val = java_mirror()->obj_field_acquire(null_reset_value_offset());
102 assert(val != nullptr, "Sanity check");
103 return val;
104 }
105
106 void InlineKlass::set_null_reset_value(oop val) {
107 assert(val != nullptr, "Sanity check");
108 assert(oopDesc::is_oop(val), "Sanity check");
109 assert(val->is_inline_type(), "Sanity check");
110 assert(val->klass() == this, "sanity check");
111 java_mirror()->obj_field_put(null_reset_value_offset(), val);
112 }
113
114 instanceOop InlineKlass::allocate_instance(TRAPS) {
115 instanceOop oop = InstanceKlass::allocate_instance(CHECK_NULL);
116 assert(oop->mark().is_inline_type(), "Expected inline type");
117 return oop;
118 }
119
120 int InlineKlass::nonstatic_oop_count() {
121 int oops = 0;
122 int map_count = nonstatic_oop_map_count();
123 OopMapBlock* block = start_of_nonstatic_oop_maps();
124 OopMapBlock* end = block + map_count;
125 while (block != end) {
126 oops += block->count();
127 block++;
128 }
129 return oops;
130 }
131
132 int InlineKlass::layout_size_in_bytes(LayoutKind kind) const {
133 switch(kind) {
134 case LayoutKind::NULL_FREE_NON_ATOMIC_FLAT:
135 assert(has_non_atomic_layout(), "Layout not available");
136 return non_atomic_size_in_bytes();
137 break;
138 case LayoutKind::NULL_FREE_ATOMIC_FLAT:
139 assert(has_atomic_layout(), "Layout not available");
140 return atomic_size_in_bytes();
141 break;
142 case LayoutKind::NULLABLE_ATOMIC_FLAT:
143 assert(has_nullable_atomic_layout(), "Layout not available");
144 return nullable_atomic_size_in_bytes();
145 break;
146 case LayoutKind::BUFFERED:
147 return payload_size_in_bytes();
148 break;
149 default:
150 ShouldNotReachHere();
151 }
152 }
153
154 int InlineKlass::layout_alignment(LayoutKind kind) const {
155 switch(kind) {
156 case LayoutKind::NULL_FREE_NON_ATOMIC_FLAT:
157 assert(has_non_atomic_layout(), "Layout not available");
158 return non_atomic_alignment();
159 break;
160 case LayoutKind::NULL_FREE_ATOMIC_FLAT:
161 assert(has_atomic_layout(), "Layout not available");
162 return atomic_size_in_bytes();
163 break;
164 case LayoutKind::NULLABLE_ATOMIC_FLAT:
165 assert(has_nullable_atomic_layout(), "Layout not available");
166 return nullable_atomic_size_in_bytes();
167 break;
168 case LayoutKind::BUFFERED:
169 return payload_alignment();
170 break;
171 default:
172 ShouldNotReachHere();
173 }
174 }
175
176 bool InlineKlass::is_layout_supported(LayoutKind lk) {
177 switch(lk) {
178 case LayoutKind::NULL_FREE_NON_ATOMIC_FLAT:
179 return has_non_atomic_layout();
180 break;
181 case LayoutKind::NULL_FREE_ATOMIC_FLAT:
182 return has_atomic_layout();
183 break;
184 case LayoutKind::NULLABLE_ATOMIC_FLAT:
185 return has_nullable_atomic_layout();
186 break;
187 case LayoutKind::BUFFERED:
188 return true;
189 break;
190 default:
191 ShouldNotReachHere();
192 }
193 }
194
195 void InlineKlass::copy_payload_to_addr(void* src, void* dst, LayoutKind lk, bool dest_is_initialized) {
196 assert(is_layout_supported(lk), "Unsupported layout");
197 assert(lk != LayoutKind::REFERENCE && lk != LayoutKind::UNKNOWN, "Sanity check");
198 switch(lk) {
199 case LayoutKind::NULLABLE_ATOMIC_FLAT: {
200 if (is_payload_marked_as_null((address)src)) {
201 // copy null_reset value to dest
202 if (dest_is_initialized) {
203 HeapAccess<>::value_copy(payload_addr(null_reset_value()), dst, this, lk);
204 } else {
205 HeapAccess<IS_DEST_UNINITIALIZED>::value_copy(payload_addr(null_reset_value()), dst, this, lk);
206 }
207 } else {
208 // Copy has to be performed, even if this is an empty value, because of the null marker
209 if (dest_is_initialized) {
210 HeapAccess<>::value_copy(src, dst, this, lk);
211 } else {
212 HeapAccess<IS_DEST_UNINITIALIZED>::value_copy(src, dst, this, lk);
213 }
214 }
215 }
216 break;
217 case LayoutKind::BUFFERED:
218 case LayoutKind::NULL_FREE_ATOMIC_FLAT:
219 case LayoutKind::NULL_FREE_NON_ATOMIC_FLAT: {
220 if (is_empty_inline_type()) return; // nothing to do
221 if (dest_is_initialized) {
222 HeapAccess<>::value_copy(src, dst, this, lk);
223 } else {
224 HeapAccess<IS_DEST_UNINITIALIZED>::value_copy(src, dst, this, lk);
225 }
226 }
227 break;
228 default:
229 ShouldNotReachHere();
230 }
231 }
232
233 oop InlineKlass::read_payload_from_addr(const oop src, size_t offset, LayoutKind lk, TRAPS) {
234 assert(src != nullptr, "Must be");
235 assert(is_layout_supported(lk), "Unsupported layout");
236 switch(lk) {
237 case LayoutKind::NULLABLE_ATOMIC_FLAT: {
238 if (is_payload_marked_as_null((address)((char*)(oopDesc*)src + offset))) {
239 return nullptr;
240 }
241 } // Fallthrough
242 case LayoutKind::BUFFERED:
243 case LayoutKind::NULL_FREE_ATOMIC_FLAT:
244 case LayoutKind::NULL_FREE_NON_ATOMIC_FLAT: {
245 Handle obj_h(THREAD, src);
246 oop res = allocate_instance(CHECK_NULL);
247 copy_payload_to_addr((void*)(cast_from_oop<char*>(obj_h()) + offset), payload_addr(res), lk, false);
248 if (LayoutKindHelper::is_nullable_flat(lk)) {
249 if(is_payload_marked_as_null(payload_addr(res))) {
250 return nullptr;
251 }
252 }
253 return res;
254 }
255 break;
256 default:
257 ShouldNotReachHere();
258 }
259 }
260
261 void InlineKlass::write_value_to_addr(oop src, void* dst, LayoutKind lk, TRAPS) {
262 void* src_addr = nullptr;
263 if (src == nullptr) {
264 if (!LayoutKindHelper::is_nullable_flat(lk)) {
265 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Value is null");
266 }
267 // Writing null to a nullable flat field/element is usually done by writing
268 // the whole pre-allocated null_reset_value at the payload address to ensure
269 // that the null marker and all potential oops are reset to "zeros".
270 // However, the null_reset_value is allocated during class initialization.
271 // If the current value of the field is null, it is possible that the class
272 // of the field has not been initialized yet and thus the null_reset_value
273 // might not be available yet.
274 // Writing null over an already null value should not trigger class initialization.
275 // The solution is to detect null being written over null cases and return immediately
276 // (writing null over null is a no-op from a field modification point of view)
277 if (is_payload_marked_as_null((address)dst)) return;
278 src_addr = payload_addr(null_reset_value());
279 } else {
280 src_addr = payload_addr(src);
281 if (LayoutKindHelper::is_nullable_flat(lk)) {
282 mark_payload_as_non_null((address)src_addr);
283 }
284 }
285 copy_payload_to_addr(src_addr, dst, lk, true /* dest_is_initialized */);
286 }
287
288 // Arrays of...
289
290 bool InlineKlass::maybe_flat_in_array() {
291 if (!UseArrayFlattening) {
292 return false;
293 }
294 // Too many embedded oops
295 if ((FlatArrayElementMaxOops >= 0) && (nonstatic_oop_count() > FlatArrayElementMaxOops)) {
296 return false;
297 }
298 // No flat layout?
299 if (!has_nullable_atomic_layout() && !has_atomic_layout() && !has_non_atomic_layout()) {
300 return false;
301 }
302 return true;
303 }
304
305 bool InlineKlass::is_always_flat_in_array() {
306 if (!UseArrayFlattening) {
307 return false;
308 }
309 // Too many embedded oops
310 if ((FlatArrayElementMaxOops >= 0) && (nonstatic_oop_count() > FlatArrayElementMaxOops)) {
311 return false;
312 }
313
314 // An instance is always flat in an array if we have all layouts. Note that this could change in the future when the
315 // flattening policies are updated or if new APIs are added that allow the creation of reference arrays directly.
316 return has_nullable_atomic_layout() && has_atomic_layout() && has_non_atomic_layout();
317 }
318
319 // Inline type arguments are not passed by reference, instead each
320 // field of the inline type is passed as an argument. This helper
321 // function collects the flat field (recursively)
322 // in a list. Included with the field's type is
323 // the offset of each field in the inline type: i2c and c2i adapters
324 // need that to load or store fields. Finally, the list of fields is
325 // sorted in order of increasing offsets: the adapters and the
326 // compiled code need to agree upon the order of fields.
327 //
328 // The list of basic types that is returned starts with a T_METADATA
329 // and ends with an extra T_VOID. T_METADATA/T_VOID pairs are used as
330 // delimiters. Every entry between the two is a field of the inline
331 // type. If there's an embedded inline type in the list, it also starts
332 // with a T_METADATA and ends with a T_VOID. This is so we can
333 // generate a unique fingerprint for the method's adapters and we can
334 // generate the list of basic types from the interpreter point of view
335 // (inline types passed as reference: iterate on the list until a
336 // T_METADATA, drop everything until and including the closing
337 // T_VOID) or the compiler point of view (each field of the inline
338 // types is an argument: drop all T_METADATA/T_VOID from the list).
339 //
340 // Value classes could also have fields in abstract super value classes.
341 // Use a HierarchicalFieldStream to get them as well.
342 int InlineKlass::collect_fields(GrowableArray<SigEntry>* sig, int base_off, int null_marker_offset) {
343 int count = 0;
344 SigEntry::add_entry(sig, T_METADATA, name(), base_off);
345 for (TopDownHierarchicalNonStaticFieldStreamBase fs(this); !fs.done(); fs.next()) {
346 assert(!fs.access_flags().is_static(), "TopDownHierarchicalNonStaticFieldStreamBase should not let static fields pass.");
347 int offset = base_off + fs.offset() - (base_off > 0 ? payload_offset() : 0);
348 InstanceKlass* field_holder = fs.field_descriptor().field_holder();
349 // TODO 8284443 Use different heuristic to decide what should be scalarized in the calling convention
350 if (fs.is_flat()) {
351 // Resolve klass of flat field and recursively collect fields
352 int field_null_marker_offset = -1;
353 if (!fs.is_null_free_inline_type()) {
354 field_null_marker_offset = base_off + fs.null_marker_offset() - (base_off > 0 ? payload_offset() : 0);
355 }
356 Klass* vk = field_holder->get_inline_type_field_klass(fs.index());
357 count += InlineKlass::cast(vk)->collect_fields(sig, offset, field_null_marker_offset);
358 } else {
359 BasicType bt = Signature::basic_type(fs.signature());
360 SigEntry::add_entry(sig, bt, fs.name(), offset);
361 count += type2size[bt];
362 }
363 }
364 int offset = base_off + size_helper()*HeapWordSize - (base_off > 0 ? payload_offset() : 0);
365 // Null markers are no real fields, add them manually at the end (C2 relies on this) of the flat fields
366 if (null_marker_offset != -1) {
367 SigEntry::add_null_marker(sig, name(), null_marker_offset);
368 count++;
369 }
370 SigEntry::add_entry(sig, T_VOID, name(), offset);
371 assert(sig->at(0)._bt == T_METADATA && sig->at(sig->length()-1)._bt == T_VOID, "broken structure");
372 return count;
373 }
374
375 void InlineKlass::initialize_calling_convention(TRAPS) {
376 // Because the pack and unpack handler addresses need to be loadable from generated code,
377 // they are stored at a fixed offset in the klass metadata. Since inline type klasses do
378 // not have a vtable, the vtable offset is used to store these addresses.
379 if (InlineTypeReturnedAsFields || InlineTypePassFieldsAsArgs) {
380 ResourceMark rm;
381 GrowableArray<SigEntry> sig_vk;
382 int nb_fields = collect_fields(&sig_vk);
383 if (*PrintInlineKlassFields != '\0') {
384 const char* class_name_str = _name->as_C_string();
385 if (StringUtils::class_list_match(PrintInlineKlassFields, class_name_str)) {
386 ttyLocker ttyl;
387 tty->print_cr("Fields of InlineKlass: %s", class_name_str);
388 for (const SigEntry& entry : sig_vk) {
389 tty->print(" %s: %s+%d", entry._name->as_C_string(), type2name(entry._bt), entry._offset);
390 if (entry._null_marker) {
391 tty->print(" (null marker)");
392 }
393 tty->print_cr("");
394 }
395 }
396 }
397 Array<SigEntry>* extended_sig = MetadataFactory::new_array<SigEntry>(class_loader_data(), sig_vk.length(), CHECK);
398 set_extended_sig(extended_sig);
399 for (int i = 0; i < sig_vk.length(); i++) {
400 extended_sig->at_put(i, sig_vk.at(i));
401 }
402 if (can_be_returned_as_fields(/* init= */ true)) {
403 nb_fields++;
404 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, nb_fields);
405 sig_bt[0] = T_METADATA;
406 SigEntry::fill_sig_bt(&sig_vk, sig_bt+1);
407 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, nb_fields);
408 int total = SharedRuntime::java_return_convention(sig_bt, regs, nb_fields);
409
410 if (total > 0) {
411 Array<VMRegPair>* return_regs = MetadataFactory::new_array<VMRegPair>(class_loader_data(), nb_fields, CHECK);
412 set_return_regs(return_regs);
413 for (int i = 0; i < nb_fields; i++) {
414 return_regs->at_put(i, regs[i]);
415 }
416
417 BufferedInlineTypeBlob* buffered_blob = SharedRuntime::generate_buffered_inline_type_adapter(this);
418 if (buffered_blob == nullptr) {
419 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters");
420 }
421 set_pack_handler(buffered_blob->pack_fields());
422 set_pack_handler_jobject(buffered_blob->pack_fields_jobject());
423 set_unpack_handler(buffered_blob->unpack_fields());
424 assert(CodeCache::find_blob(pack_handler()) == buffered_blob, "lost track of blob");
425 assert(can_be_returned_as_fields(), "sanity");
426 }
427 }
428 if (!can_be_returned_as_fields() && !can_be_passed_as_fields()) {
429 MetadataFactory::free_array<SigEntry>(class_loader_data(), extended_sig);
430 assert(return_regs() == nullptr, "sanity");
431 }
432 }
433 }
434
435 void InlineKlass::deallocate_contents(ClassLoaderData* loader_data) {
436 if (extended_sig() != nullptr) {
437 MetadataFactory::free_array<SigEntry>(loader_data, members()._extended_sig);
438 set_extended_sig(nullptr);
439 }
440 if (return_regs() != nullptr) {
441 MetadataFactory::free_array<VMRegPair>(loader_data, members()._return_regs);
442 set_return_regs(nullptr);
443 }
444 cleanup_blobs();
445 InstanceKlass::deallocate_contents(loader_data);
446 }
447
448 void InlineKlass::cleanup(InlineKlass* ik) {
449 ik->cleanup_blobs();
450 }
451
452 void InlineKlass::cleanup_blobs() {
453 if (pack_handler() != nullptr) {
454 CodeBlob* buffered_blob = CodeCache::find_blob(pack_handler());
455 assert(buffered_blob->is_buffered_inline_type_blob(), "bad blob type");
456 BufferBlob::free((BufferBlob*)buffered_blob);
457 set_pack_handler(nullptr);
458 set_pack_handler_jobject(nullptr);
459 set_unpack_handler(nullptr);
460 }
461 }
462
463 // Can this inline type be passed as multiple values?
464 bool InlineKlass::can_be_passed_as_fields() const {
465 return InlineTypePassFieldsAsArgs;
466 }
467
468 // Can this inline type be returned as multiple values?
469 bool InlineKlass::can_be_returned_as_fields(bool init) const {
470 return InlineTypeReturnedAsFields && (init || return_regs() != nullptr);
471 }
472
473 // Create handles for all oop fields returned in registers that are going to be live across a safepoint
474 void InlineKlass::save_oop_fields(const RegisterMap& reg_map, GrowableArray<Handle>& handles) const {
475 Thread* thread = Thread::current();
476 const Array<SigEntry>* sig_vk = extended_sig();
477 const Array<VMRegPair>* regs = return_regs();
478 int j = 1;
479
480 for (int i = 0; i < sig_vk->length(); i++) {
481 BasicType bt = sig_vk->at(i)._bt;
482 if (bt == T_OBJECT || bt == T_ARRAY) {
483 VMRegPair pair = regs->at(j);
484 address loc = reg_map.location(pair.first(), nullptr);
485 oop o = *(oop*)loc;
486 assert(oopDesc::is_oop_or_null(o), "Bad oop value: " PTR_FORMAT, p2i(o));
487 handles.push(Handle(thread, o));
488 }
489 if (bt == T_METADATA) {
490 continue;
491 }
492 if (bt == T_VOID &&
493 sig_vk->at(i-1)._bt != T_LONG &&
494 sig_vk->at(i-1)._bt != T_DOUBLE) {
495 continue;
496 }
497 j++;
498 }
499 assert(j == regs->length(), "missed a field?");
500 }
501
502 // Update oop fields in registers from handles after a safepoint
503 void InlineKlass::restore_oop_results(RegisterMap& reg_map, GrowableArray<Handle>& handles) const {
504 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
505 const Array<SigEntry>* sig_vk = extended_sig();
506 const Array<VMRegPair>* regs = return_regs();
507 assert(regs != nullptr, "inconsistent");
508
509 int j = 1;
510 int k = 0;
511 for (int i = 0; i < sig_vk->length(); i++) {
512 BasicType bt = sig_vk->at(i)._bt;
513 if (bt == T_OBJECT || bt == T_ARRAY) {
514 VMRegPair pair = regs->at(j);
515 address loc = reg_map.location(pair.first(), nullptr);
516 *(oop*)loc = handles.at(k++)();
517 }
518 if (bt == T_METADATA) {
519 continue;
520 }
521 if (bt == T_VOID &&
522 sig_vk->at(i-1)._bt != T_LONG &&
523 sig_vk->at(i-1)._bt != T_DOUBLE) {
524 continue;
525 }
526 j++;
527 }
528 assert(k == handles.length(), "missed a handle?");
529 assert(j == regs->length(), "missed a field?");
530 }
531
532 // Fields are in registers. Create an instance of the inline type and
533 // initialize it with the values of the fields.
534 oop InlineKlass::realloc_result(const RegisterMap& reg_map, const GrowableArray<Handle>& handles, TRAPS) {
535 oop new_vt = allocate_instance(CHECK_NULL);
536 const Array<SigEntry>* sig_vk = extended_sig();
537 const Array<VMRegPair>* regs = return_regs();
538
539 int j = 1;
540 int k = 0;
541 for (int i = 0; i < sig_vk->length(); i++) {
542 BasicType bt = sig_vk->at(i)._bt;
543 if (bt == T_METADATA) {
544 continue;
545 }
546 if (bt == T_VOID) {
547 if (sig_vk->at(i-1)._bt == T_LONG ||
548 sig_vk->at(i-1)._bt == T_DOUBLE) {
549 j++;
550 }
551 continue;
552 }
553 int off = sig_vk->at(i)._offset;
554 assert(off > 0, "offset in object should be positive");
555 VMRegPair pair = regs->at(j);
556 address loc = reg_map.location(pair.first(), nullptr);
557 switch(bt) {
558 case T_BOOLEAN: {
559 new_vt->bool_field_put(off, *(jboolean*)loc);
560 break;
561 }
562 case T_CHAR: {
563 new_vt->char_field_put(off, *(jchar*)loc);
564 break;
565 }
566 case T_BYTE: {
567 new_vt->byte_field_put(off, *(jbyte*)loc);
568 break;
569 }
570 case T_SHORT: {
571 new_vt->short_field_put(off, *(jshort*)loc);
572 break;
573 }
574 case T_INT: {
575 new_vt->int_field_put(off, *(jint*)loc);
576 break;
577 }
578 case T_LONG: {
579 #ifdef _LP64
580 new_vt->double_field_put(off, *(jdouble*)loc);
581 #else
582 Unimplemented();
583 #endif
584 break;
585 }
586 case T_OBJECT:
587 case T_ARRAY: {
588 Handle handle = handles.at(k++);
589 new_vt->obj_field_put(off, handle());
590 break;
591 }
592 case T_FLOAT: {
593 new_vt->float_field_put(off, *(jfloat*)loc);
594 break;
595 }
596 case T_DOUBLE: {
597 new_vt->double_field_put(off, *(jdouble*)loc);
598 break;
599 }
600 default:
601 ShouldNotReachHere();
602 }
603 *(intptr_t*)loc = 0xDEAD;
604 j++;
605 }
606 assert(j == regs->length(), "missed a field?");
607 assert(k == handles.length(), "missed an oop?");
608 return new_vt;
609 }
610
611 // Check if we return an inline type in scalarized form, i.e. check if either
612 // - The return value is a tagged InlineKlass pointer, or
613 // - The return value is an inline type oop that is also returned in scalarized form
614 InlineKlass* InlineKlass::returned_inline_klass(const RegisterMap& map, bool* return_oop, Method* method) {
615 BasicType bt = T_METADATA;
616 VMRegPair pair;
617 int nb = SharedRuntime::java_return_convention(&bt, &pair, 1);
618 assert(nb == 1, "broken");
619
620 address loc = map.location(pair.first(), nullptr);
621 intptr_t ptr = *(intptr_t*)loc;
622 if (is_set_nth_bit(ptr, 0)) {
623 // Return value is tagged, must be an InlineKlass pointer
624 clear_nth_bit(ptr, 0);
625 assert(Metaspace::contains((void*)ptr), "should be klass");
626 InlineKlass* vk = (InlineKlass*)ptr;
627 assert(vk->can_be_returned_as_fields(), "must be able to return as fields");
628 if (return_oop != nullptr) {
629 // Not returning an oop
630 *return_oop = false;
631 }
632 return vk;
633 }
634 // Return value is not tagged, must be a valid oop
635 oop o = cast_to_oop(ptr);
636 assert(oopDesc::is_oop_or_null(o), "Bad oop return: " PTR_FORMAT, ptr);
637 if (return_oop != nullptr && o != nullptr && o->is_inline_type()) {
638 // Check if inline type is also returned in scalarized form
639 InlineKlass* vk_val = InlineKlass::cast(o->klass());
640 InlineKlass* vk_sig = method->returns_inline_type();
641 if (vk_val->can_be_returned_as_fields() && vk_sig != nullptr) {
642 assert(vk_val == vk_sig, "Unexpected return value");
643 return vk_val;
644 }
645 }
646 return nullptr;
647 }
648
649 // CDS support
650 #if INCLUDE_CDS
651
652 void InlineKlass::remove_unshareable_info() {
653 InstanceKlass::remove_unshareable_info();
654
655 // update it to point to the "buffered" copy of this class.
656 _adr_inline_klass_members = calculate_members_address();
657 ArchivePtrMarker::mark_pointer(&_adr_inline_klass_members);
658
659 set_extended_sig(nullptr);
660 set_return_regs(nullptr);
661 set_pack_handler(nullptr);
662 set_pack_handler_jobject(nullptr);
663 set_unpack_handler(nullptr);
664
665 assert(pack_handler() == nullptr, "pack handler not null");
666 }
667
668 #endif // CDS
669
670 // Verification
671
672 void InlineKlass::verify_on(outputStream* st) {
673 InstanceKlass::verify_on(st);
674 guarantee(prototype_header().is_inline_type(), "Prototype header is not inline type");
675 }
676
677 void InlineKlass::oop_verify_on(oop obj, outputStream* st) {
678 InstanceKlass::oop_verify_on(obj, st);
679 guarantee(obj->mark().is_inline_type(), "Header is not inline type");
680 }