1 /*
2 * Copyright (c) 1997, 2024, 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/javaClasses.inline.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "compiler/compilationPolicy.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "gc/shared/barrierSetNMethod.hpp"
35 #include "gc/shared/collectedHeap.hpp"
36 #include "interpreter/bytecodeTracer.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "interpreter/interpreterRuntime.hpp"
39 #include "interpreter/linkResolver.hpp"
40 #include "interpreter/templateTable.hpp"
41 #include "jvm_io.h"
42 #include "logging/log.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.hpp"
46 #include "oops/constantPool.inline.hpp"
47 #include "oops/cpCache.inline.hpp"
48 #include "oops/instanceKlass.inline.hpp"
49 #include "oops/klass.inline.hpp"
50 #include "oops/methodData.hpp"
51 #include "oops/method.inline.hpp"
52 #include "oops/objArrayKlass.hpp"
53 #include "oops/objArrayOop.inline.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/symbol.hpp"
56 #include "prims/jvmtiExport.hpp"
57 #include "prims/methodHandles.hpp"
58 #include "prims/nativeLookup.hpp"
59 #include "runtime/atomic.hpp"
60 #include "runtime/continuation.hpp"
61 #include "runtime/deoptimization.hpp"
62 #include "runtime/fieldDescriptor.inline.hpp"
63 #include "runtime/frame.inline.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/icache.hpp"
66 #include "runtime/interfaceSupport.inline.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/jfieldIDWorkaround.hpp"
70 #include "runtime/osThread.hpp"
71 #include "runtime/sharedRuntime.hpp"
72 #include "runtime/stackWatermarkSet.hpp"
73 #include "runtime/stubRoutines.hpp"
74 #include "runtime/synchronizer.inline.hpp"
75 #include "runtime/threadCritical.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/checkedCast.hpp"
78 #include "utilities/copy.hpp"
79 #include "utilities/events.hpp"
80 #ifdef COMPILER2
81 #include "opto/runtime.hpp"
82 #endif
83
84 // Helper class to access current interpreter state
85 class LastFrameAccessor : public StackObj {
86 frame _last_frame;
87 public:
88 LastFrameAccessor(JavaThread* current) {
89 assert(current == Thread::current(), "sanity");
90 _last_frame = current->last_frame();
91 }
92 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
93 Method* method() const { return _last_frame.interpreter_frame_method(); }
94 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
95 int bci() const { return _last_frame.interpreter_frame_bci(); }
96 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
97
98 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
99 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
210 JRT_END
211
212
213 //------------------------------------------------------------------------------------------------------------------------
214 // Allocation
215
216 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
217 Klass* k = pool->klass_at(index, CHECK);
218 InstanceKlass* klass = InstanceKlass::cast(k);
219
220 // Make sure we are not instantiating an abstract klass
221 klass->check_valid_for_instantiation(true, CHECK);
222
223 // Make sure klass is initialized
224 klass->initialize(CHECK);
225
226 oop obj = klass->allocate_instance(CHECK);
227 current->set_vm_result(obj);
228 JRT_END
229
230
231 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
232 oop obj = oopFactory::new_typeArray(type, size, CHECK);
233 current->set_vm_result(obj);
234 JRT_END
235
236
237 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
238 Klass* klass = pool->klass_at(index, CHECK);
239 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
240 current->set_vm_result(obj);
241 JRT_END
242
243
244 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
245 // We may want to pass in more arguments - could make this slightly faster
246 LastFrameAccessor last_frame(current);
247 ConstantPool* constants = last_frame.method()->constants();
248 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
249 Klass* klass = constants->klass_at(i, CHECK);
250 int nof_dims = last_frame.number_of_dimensions();
251 assert(klass->is_klass(), "not a class");
252 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
253
254 // We must create an array of jints to pass to multi_allocate.
255 ResourceMark rm(current);
256 const int small_dims = 10;
257 jint dim_array[small_dims];
258 jint *dims = &dim_array[0];
259 if (nof_dims > small_dims) {
260 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
261 }
262 for (int index = 0; index < nof_dims; index++) {
263 // offset from first_size_address is addressed as local[index]
264 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
265 dims[index] = first_size_address[n];
266 }
267 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
268 current->set_vm_result(obj);
269 JRT_END
270
271
272 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
273 assert(oopDesc::is_oop(obj), "must be a valid oop");
274 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
275 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
276 JRT_END
277
278
279 // Quicken instance-of and check-cast bytecodes
280 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
281 // Force resolving; quicken the bytecode
282 LastFrameAccessor last_frame(current);
283 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
284 ConstantPool* cpool = last_frame.method()->constants();
285 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
286 // program we might have seen an unquick'd bytecode in the interpreter but have another
287 // thread quicken the bytecode before we get here.
288 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
289 Klass* klass = cpool->klass_at(which, CHECK);
290 current->set_vm_result_2(klass);
291 JRT_END
292
293
294 //------------------------------------------------------------------------------------------------------------------------
295 // Exceptions
296
297 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
601 // and therefore we don't have the receiver object at our fingertips. (Though,
602 // on some platforms the receiver still resides in a register...). Thus,
603 // we have no choice but print an error message not containing the receiver
604 // type.
605 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
606 Method* missingMethod))
607 ResourceMark rm(current);
608 assert(missingMethod != nullptr, "sanity");
609 methodHandle m(current, missingMethod);
610 LinkResolver::throw_abstract_method_error(m, THREAD);
611 JRT_END
612
613 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
614 Klass* recvKlass,
615 Method* missingMethod))
616 ResourceMark rm(current);
617 methodHandle mh = methodHandle(current, missingMethod);
618 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
619 JRT_END
620
621
622 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
623 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
624 JRT_END
625
626 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
627 Klass* recvKlass,
628 Klass* interfaceKlass))
629 ResourceMark rm(current);
630 char buf[1000];
631 buf[0] = '\0';
632 jio_snprintf(buf, sizeof(buf),
633 "Class %s does not implement the requested interface %s",
634 recvKlass ? recvKlass->external_name() : "nullptr",
635 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
636 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
637 JRT_END
638
639 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
640 THROW(vmSymbols::java_lang_NullPointerException());
685 // initializer method <init>. If resolution were not inhibited, a putfield
686 // in an initializer method could be resolved in the initializer. Subsequent
687 // putfield instructions to the same field would then use cached information.
688 // As a result, those instructions would not pass through the VM. That is,
689 // checks in resolve_field_access() would not be executed for those instructions
690 // and the required IllegalAccessError would not be thrown.
691 //
692 // Also, we need to delay resolving getstatic and putstatic instructions until the
693 // class is initialized. This is required so that access to the static
694 // field will call the initialization function every time until the class
695 // is completely initialized ala. in 2.17.5 in JVM Specification.
696 InstanceKlass* klass = info.field_holder();
697 bool uninitialized_static = is_static && !klass->is_initialized();
698 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
699 info.has_initialized_final_update();
700 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
701
702 Bytecodes::Code get_code = (Bytecodes::Code)0;
703 Bytecodes::Code put_code = (Bytecodes::Code)0;
704 if (!uninitialized_static) {
705 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
706 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
707 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
708 }
709 }
710
711 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
712 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile());
713 entry->fill_in(info.field_holder(), info.offset(),
714 checked_cast<u2>(info.index()), checked_cast<u1>(state),
715 static_cast<u1>(get_code), static_cast<u1>(put_code));
716 }
717
718
719 //------------------------------------------------------------------------------------------------------------------------
720 // Synchronization
721 //
722 // The interpreter's synchronization code is factored out so that it can
723 // be shared by method invocation and synchronized blocks.
724 //%note synchronization_3
725
726 //%note monitor_1
727 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
728 #ifdef ASSERT
729 current->last_frame().interpreter_frame_verify_monitor(elem);
730 #endif
731 Handle h_obj(current, elem->obj());
732 assert(Universe::heap()->is_in_or_null(h_obj()),
739 #endif
740 JRT_END
741
742 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
743 oop obj = elem->obj();
744 assert(Universe::heap()->is_in(obj), "must be an object");
745 // The object could become unlocked through a JNI call, which we have no other checks for.
746 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
747 if (obj->is_unlocked()) {
748 if (CheckJNICalls) {
749 fatal("Object has been unlocked by JNI");
750 }
751 return;
752 }
753 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
754 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
755 // again at method exit or in the case of an exception.
756 elem->set_obj(nullptr);
757 JRT_END
758
759
760 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
761 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
762 JRT_END
763
764
765 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
766 // Returns an illegal exception to install into the current thread. The
767 // pending_exception flag is cleared so normal exception handling does not
768 // trigger. Any current installed exception will be overwritten. This
769 // method will be called during an exception unwind.
770
771 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
772 Handle exception(current, current->vm_result());
773 assert(exception() != nullptr, "vm result should be set");
774 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
775 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
776 current->set_vm_result(exception());
777 JRT_END
778
779
780 //------------------------------------------------------------------------------------------------------------------------
781 // Invokes
782
783 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
784 return method->orig_bytecode_at(method->bci_from(bcp));
785 JRT_END
786
787 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
788 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
789 JRT_END
790
791 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
792 JvmtiExport::post_raw_breakpoint(current, method, bcp);
793 JRT_END
794
795 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
796 LastFrameAccessor last_frame(current);
797 // extract receiver from the outgoing argument list if necessary
798 Handle receiver(current, nullptr);
1151 LastFrameAccessor last_frame(current);
1152 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1153 }
1154 JRT_END
1155
1156 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1157 assert(current == JavaThread::current(), "pre-condition");
1158 // This function is called by the interpreter when the return poll found a reason
1159 // to call the VM. The reason could be that we are returning into a not yet safe
1160 // to access frame. We handle that below.
1161 // Note that this path does not check for single stepping, because we do not want
1162 // to single step when unwinding frames for an exception being thrown. Instead,
1163 // such single stepping code will use the safepoint table, which will use the
1164 // InterpreterRuntime::at_safepoint callback.
1165 StackWatermarkSet::before_unwind(current);
1166 JRT_END
1167
1168 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1169 ResolvedFieldEntry *entry))
1170
1171 // check the access_flags for the field in the klass
1172
1173 InstanceKlass* ik = entry->field_holder();
1174 int index = entry->field_index();
1175 if (!ik->field_status(index).is_access_watched()) return;
1176
1177 bool is_static = (obj == nullptr);
1178 HandleMark hm(current);
1179
1180 Handle h_obj;
1181 if (!is_static) {
1182 // non-static field accessors have an object, but we need a handle
1183 h_obj = Handle(current, obj);
1184 }
1185 InstanceKlass* field_holder = entry->field_holder(); // HERE
1186 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static);
1187 LastFrameAccessor last_frame(current);
1188 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1189 JRT_END
1190
1191 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1192 ResolvedFieldEntry *entry, jvalue *value))
1193
1194 InstanceKlass* ik = entry->field_holder();
1195
1196 // check the access_flags for the field in the klass
1197 int index = entry->field_index();
1198 // bail out if field modifications are not watched
1199 if (!ik->field_status(index).is_modification_watched()) return;
1200
1201 char sig_type = '\0';
1202
1203 switch((TosState)entry->tos_state()) {
1204 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1205 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1206 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1207 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1208 case itos: sig_type = JVM_SIGNATURE_INT; break;
1209 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1210 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1211 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1212 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1213 default: ShouldNotReachHere(); return;
1214 }
1215 bool is_static = (obj == nullptr);
1216
1217 HandleMark hm(current);
1218 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static);
1219 jvalue fvalue;
1220 #ifdef _LP64
1221 fvalue = *value;
1222 #else
1223 // Long/double values are stored unaligned and also noncontiguously with
1224 // tagged stacks. We can't just do a simple assignment even in the non-
1225 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1226 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1227 // We assume that the two halves of longs/doubles are stored in interpreter
1228 // stack slots in platform-endian order.
1229 jlong_accessor u;
1230 jint* newval = (jint*)value;
1231 u.words[0] = newval[0];
1232 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1233 fvalue.j = u.long_value;
1234 #endif // _LP64
1235
1236 Handle h_obj;
1237 if (!is_static) {
1238 // non-static field accessors have an object, but we need a handle
|
1 /*
2 * Copyright (c) 1997, 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 "classfile/javaClasses.inline.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "compiler/compilationPolicy.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/disassembler.hpp"
35 #include "gc/shared/barrierSetNMethod.hpp"
36 #include "gc/shared/collectedHeap.hpp"
37 #include "interpreter/bytecodeTracer.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "interpreter/interpreterRuntime.hpp"
40 #include "interpreter/linkResolver.hpp"
41 #include "interpreter/templateTable.hpp"
42 #include "jvm_io.h"
43 #include "logging/log.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/constantPool.inline.hpp"
48 #include "oops/cpCache.inline.hpp"
49 #include "oops/flatArrayKlass.hpp"
50 #include "oops/flatArrayOop.inline.hpp"
51 #include "oops/inlineKlass.inline.hpp"
52 #include "oops/instanceKlass.inline.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/methodData.hpp"
55 #include "oops/method.inline.hpp"
56 #include "oops/objArrayKlass.hpp"
57 #include "oops/objArrayOop.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/symbol.hpp"
60 #include "prims/jvmtiExport.hpp"
61 #include "prims/methodHandles.hpp"
62 #include "prims/nativeLookup.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/fieldDescriptor.inline.hpp"
67 #include "runtime/frame.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/icache.hpp"
70 #include "runtime/interfaceSupport.inline.hpp"
71 #include "runtime/java.hpp"
72 #include "runtime/javaCalls.hpp"
73 #include "runtime/jfieldIDWorkaround.hpp"
74 #include "runtime/osThread.hpp"
75 #include "runtime/sharedRuntime.hpp"
76 #include "runtime/stackWatermarkSet.hpp"
77 #include "runtime/stubRoutines.hpp"
78 #include "runtime/synchronizer.inline.hpp"
79 #include "runtime/threadCritical.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/globalDefinitions.hpp"
85 #ifdef COMPILER2
86 #include "opto/runtime.hpp"
87 #endif
88
89 // Helper class to access current interpreter state
90 class LastFrameAccessor : public StackObj {
91 frame _last_frame;
92 public:
93 LastFrameAccessor(JavaThread* current) {
94 assert(current == Thread::current(), "sanity");
95 _last_frame = current->last_frame();
96 }
97 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
98 Method* method() const { return _last_frame.interpreter_frame_method(); }
99 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
100 int bci() const { return _last_frame.interpreter_frame_bci(); }
101 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
102
103 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
104 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
215 JRT_END
216
217
218 //------------------------------------------------------------------------------------------------------------------------
219 // Allocation
220
221 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
222 Klass* k = pool->klass_at(index, CHECK);
223 InstanceKlass* klass = InstanceKlass::cast(k);
224
225 // Make sure we are not instantiating an abstract klass
226 klass->check_valid_for_instantiation(true, CHECK);
227
228 // Make sure klass is initialized
229 klass->initialize(CHECK);
230
231 oop obj = klass->allocate_instance(CHECK);
232 current->set_vm_result(obj);
233 JRT_END
234
235 JRT_ENTRY(void, InterpreterRuntime::uninitialized_static_inline_type_field(JavaThread* current, oopDesc* mirror, ResolvedFieldEntry* entry))
236 // The interpreter tries to access an inline static field that has not been initialized.
237 // This situation can happen in different scenarios:
238 // 1 - if the load or initialization of the field failed during step 8 of
239 // the initialization of the holder of the field, in this case the access to the field
240 // must fail
241 // 2 - it can also happen when the initialization of the holder class triggered the initialization of
242 // another class which accesses this field in its static initializer, in this case the
243 // access must succeed to allow circularity
244 // The code below tries to load and initialize the field's class again before returning the default value.
245 // If the field was not initialized because of an error, an exception should be thrown.
246 // If the class is being initialized, the default value is returned.
247 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
248 instanceHandle mirror_h(THREAD, (instanceOop)mirror);
249 InstanceKlass* klass = entry->field_holder();
250 u2 index = entry->field_index();
251 assert(klass == java_lang_Class::as_Klass(mirror), "Not the field holder klass");
252 assert(klass->field_is_null_free_inline_type(index), "Sanity check");
253 if (klass->is_being_initialized() && klass->is_reentrant_initialization(THREAD)) {
254 int offset = klass->field_offset(index);
255 Klass* field_k = klass->get_inline_type_field_klass_or_null(index);
256 if (field_k == nullptr) {
257 field_k = SystemDictionary::resolve_or_fail(klass->field_signature(index)->fundamental_name(THREAD),
258 Handle(THREAD, klass->class_loader()),
259 Handle(THREAD, klass->protection_domain()),
260 true, CHECK);
261 assert(field_k != nullptr, "Should have been loaded or an exception thrown above");
262 if (!field_k->is_inline_klass()) {
263 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
264 err_msg("class %s expects class %s to be a concrete value class but it is not",
265 klass->name()->as_C_string(), field_k->external_name()));
266 }
267 InlineLayoutInfo* li = klass->inline_layout_info_adr(index);
268 li->set_klass(InlineKlass::cast(field_k));
269 li->set_kind(LayoutKind::REFERENCE);
270 }
271 field_k->initialize(CHECK);
272 oop defaultvalue = InlineKlass::cast(field_k)->default_value();
273 // It is safe to initialize the static field because 1) the current thread is the initializing thread
274 // and is the only one that can access it, and 2) the field is actually not initialized (i.e. null)
275 // otherwise the JVM should not be executing this code.
276 mirror_h()->obj_field_put(offset, defaultvalue);
277 current->set_vm_result(defaultvalue);
278 } else {
279 assert(klass->is_in_error_state(), "If not initializing, initialization must have failed to get there");
280 ResourceMark rm(THREAD);
281 const char* desc = "Could not initialize class ";
282 const char* className = klass->external_name();
283 size_t msglen = strlen(desc) + strlen(className) + 1;
284 char* message = NEW_RESOURCE_ARRAY(char, msglen);
285 if (nullptr == message) {
286 // Out of memory: can't create detailed error message
287 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
288 } else {
289 jio_snprintf(message, msglen, "%s%s", desc, className);
290 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
291 }
292 }
293 JRT_END
294
295 JRT_ENTRY(void, InterpreterRuntime::read_flat_field(JavaThread* current, oopDesc* obj, ResolvedFieldEntry* entry))
296 assert(oopDesc::is_oop(obj), "Sanity check");
297 Handle obj_h(THREAD, obj);
298
299 InstanceKlass* holder = InstanceKlass::cast(entry->field_holder());
300 assert(entry->field_holder()->field_is_flat(entry->field_index()), "Sanity check");
301
302 InlineLayoutInfo* layout_info = holder->inline_layout_info_adr(entry->field_index());
303 InlineKlass* field_vklass = layout_info->klass();
304
305 #ifdef ASSERT
306 fieldDescriptor fd;
307 bool found = holder->find_field_from_offset(entry->field_offset(), false, &fd);
308 assert(found, "Field not found");
309 assert(fd.is_flat(), "Field must be flat");
310 #endif // ASSERT
311
312 oop res = field_vklass->read_payload_from_addr(obj_h(), entry->field_offset(), layout_info->kind(), CHECK);
313 current->set_vm_result(res);
314 JRT_END
315
316 JRT_ENTRY(void, InterpreterRuntime::read_nullable_flat_field(JavaThread* current, oopDesc* obj, ResolvedFieldEntry* entry))
317 assert(oopDesc::is_oop(obj), "Sanity check");
318 assert(entry->has_null_marker(), "Otherwise should not get there");
319 Handle obj_h(THREAD, obj);
320
321 InstanceKlass* holder = entry->field_holder();
322 int field_index = entry->field_index();
323 InlineLayoutInfo* li= holder->inline_layout_info_adr(field_index);
324
325 #ifdef ASSERT
326 fieldDescriptor fd;
327 bool found = holder->find_field_from_offset(entry->field_offset(), false, &fd);
328 assert(found, "Field not found");
329 assert(fd.is_flat(), "Field must be flat");
330 #endif // ASSERT
331
332 InlineKlass* field_vklass = InlineKlass::cast(li->klass());
333 oop res = field_vklass->read_payload_from_addr(obj_h(), entry->field_offset(), li->kind(), CHECK);
334 current->set_vm_result(res);
335
336 JRT_END
337
338 JRT_ENTRY(void, InterpreterRuntime::write_nullable_flat_field(JavaThread* current, oopDesc* obj, oopDesc* value, ResolvedFieldEntry* entry))
339 assert(oopDesc::is_oop(obj), "Sanity check");
340 Handle obj_h(THREAD, obj);
341 assert(value == nullptr || oopDesc::is_oop(value), "Sanity check");
342 Handle val_h(THREAD, value);
343
344 InstanceKlass* holder = entry->field_holder();
345 InlineLayoutInfo* li = holder->inline_layout_info_adr(entry->field_index());
346 InlineKlass* vk = li->klass();
347 vk->write_value_to_addr(val_h(), ((char*)(oopDesc*)obj_h()) + entry->field_offset(), li->kind(), true, CHECK);
348 JRT_END
349
350 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
351 oop obj = oopFactory::new_typeArray(type, size, CHECK);
352 current->set_vm_result(obj);
353 JRT_END
354
355
356 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
357 Klass* klass = pool->klass_at(index, CHECK);
358 arrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
359 current->set_vm_result(obj);
360 JRT_END
361
362 JRT_ENTRY(void, InterpreterRuntime::flat_array_load(JavaThread* current, arrayOopDesc* array, int index))
363 assert(array->is_flatArray(), "Must be");
364 flatArrayOop farray = (flatArrayOop)array;
365 oop res = farray->read_value_from_flat_array(index, CHECK);
366 current->set_vm_result(res);
367 JRT_END
368
369 JRT_ENTRY(void, InterpreterRuntime::flat_array_store(JavaThread* current, oopDesc* val, arrayOopDesc* array, int index))
370 assert(array->is_flatArray(), "Must be");
371 flatArrayOop farray = (flatArrayOop)array;
372 farray->write_value_to_flat_array(val, index, CHECK);
373 JRT_END
374
375 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
376 // We may want to pass in more arguments - could make this slightly faster
377 LastFrameAccessor last_frame(current);
378 ConstantPool* constants = last_frame.method()->constants();
379 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
380 Klass* klass = constants->klass_at(i, CHECK);
381 int nof_dims = last_frame.number_of_dimensions();
382 assert(klass->is_klass(), "not a class");
383 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
384
385 // We must create an array of jints to pass to multi_allocate.
386 ResourceMark rm(current);
387 const int small_dims = 10;
388 jint dim_array[small_dims];
389 jint *dims = &dim_array[0];
390 if (nof_dims > small_dims) {
391 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
392 }
393 for (int index = 0; index < nof_dims; index++) {
394 // offset from first_size_address is addressed as local[index]
395 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
396 dims[index] = first_size_address[n];
397 }
398 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
399 current->set_vm_result(obj);
400 JRT_END
401
402
403 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
404 assert(oopDesc::is_oop(obj), "must be a valid oop");
405 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
406 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
407 JRT_END
408
409 JRT_ENTRY(jboolean, InterpreterRuntime::is_substitutable(JavaThread* current, oopDesc* aobj, oopDesc* bobj))
410 assert(oopDesc::is_oop(aobj) && oopDesc::is_oop(bobj), "must be valid oops");
411
412 Handle ha(THREAD, aobj);
413 Handle hb(THREAD, bobj);
414 JavaValue result(T_BOOLEAN);
415 JavaCallArguments args;
416 args.push_oop(ha);
417 args.push_oop(hb);
418 methodHandle method(current, Universe::is_substitutable_method());
419 method->method_holder()->initialize(CHECK_false); // Ensure class ValueObjectMethods is initialized
420 JavaCalls::call(&result, method, &args, THREAD);
421 if (HAS_PENDING_EXCEPTION) {
422 // Something really bad happened because isSubstitutable() should not throw exceptions
423 // If it is an error, just let it propagate
424 // If it is an exception, wrap it into an InternalError
425 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
426 Handle e(THREAD, PENDING_EXCEPTION);
427 CLEAR_PENDING_EXCEPTION;
428 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in substitutability test", e, false);
429 }
430 }
431 return result.get_jboolean();
432 JRT_END
433
434 // Quicken instance-of and check-cast bytecodes
435 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
436 // Force resolving; quicken the bytecode
437 LastFrameAccessor last_frame(current);
438 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
439 ConstantPool* cpool = last_frame.method()->constants();
440 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
441 // program we might have seen an unquick'd bytecode in the interpreter but have another
442 // thread quicken the bytecode before we get here.
443 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
444 Klass* klass = cpool->klass_at(which, CHECK);
445 current->set_vm_result_2(klass);
446 JRT_END
447
448
449 //------------------------------------------------------------------------------------------------------------------------
450 // Exceptions
451
452 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
756 // and therefore we don't have the receiver object at our fingertips. (Though,
757 // on some platforms the receiver still resides in a register...). Thus,
758 // we have no choice but print an error message not containing the receiver
759 // type.
760 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
761 Method* missingMethod))
762 ResourceMark rm(current);
763 assert(missingMethod != nullptr, "sanity");
764 methodHandle m(current, missingMethod);
765 LinkResolver::throw_abstract_method_error(m, THREAD);
766 JRT_END
767
768 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
769 Klass* recvKlass,
770 Method* missingMethod))
771 ResourceMark rm(current);
772 methodHandle mh = methodHandle(current, missingMethod);
773 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
774 JRT_END
775
776 JRT_ENTRY(void, InterpreterRuntime::throw_InstantiationError(JavaThread* current))
777 THROW(vmSymbols::java_lang_InstantiationError());
778 JRT_END
779
780
781 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
782 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
783 JRT_END
784
785 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
786 Klass* recvKlass,
787 Klass* interfaceKlass))
788 ResourceMark rm(current);
789 char buf[1000];
790 buf[0] = '\0';
791 jio_snprintf(buf, sizeof(buf),
792 "Class %s does not implement the requested interface %s",
793 recvKlass ? recvKlass->external_name() : "nullptr",
794 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
795 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
796 JRT_END
797
798 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
799 THROW(vmSymbols::java_lang_NullPointerException());
844 // initializer method <init>. If resolution were not inhibited, a putfield
845 // in an initializer method could be resolved in the initializer. Subsequent
846 // putfield instructions to the same field would then use cached information.
847 // As a result, those instructions would not pass through the VM. That is,
848 // checks in resolve_field_access() would not be executed for those instructions
849 // and the required IllegalAccessError would not be thrown.
850 //
851 // Also, we need to delay resolving getstatic and putstatic instructions until the
852 // class is initialized. This is required so that access to the static
853 // field will call the initialization function every time until the class
854 // is completely initialized ala. in 2.17.5 in JVM Specification.
855 InstanceKlass* klass = info.field_holder();
856 bool uninitialized_static = is_static && !klass->is_initialized();
857 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
858 info.has_initialized_final_update();
859 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
860
861 Bytecodes::Code get_code = (Bytecodes::Code)0;
862 Bytecodes::Code put_code = (Bytecodes::Code)0;
863 if (!uninitialized_static) {
864 if (is_static) {
865 get_code = Bytecodes::_getstatic;
866 } else {
867 get_code = Bytecodes::_getfield;
868 }
869 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
870 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
871 }
872 }
873
874 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
875 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile(),
876 info.is_flat(), info.is_null_free_inline_type(),
877 info.has_null_marker());
878
879 entry->fill_in(info.field_holder(), info.offset(),
880 checked_cast<u2>(info.index()), checked_cast<u1>(state),
881 static_cast<u1>(get_code), static_cast<u1>(put_code));
882 }
883
884
885 //------------------------------------------------------------------------------------------------------------------------
886 // Synchronization
887 //
888 // The interpreter's synchronization code is factored out so that it can
889 // be shared by method invocation and synchronized blocks.
890 //%note synchronization_3
891
892 //%note monitor_1
893 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
894 #ifdef ASSERT
895 current->last_frame().interpreter_frame_verify_monitor(elem);
896 #endif
897 Handle h_obj(current, elem->obj());
898 assert(Universe::heap()->is_in_or_null(h_obj()),
905 #endif
906 JRT_END
907
908 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
909 oop obj = elem->obj();
910 assert(Universe::heap()->is_in(obj), "must be an object");
911 // The object could become unlocked through a JNI call, which we have no other checks for.
912 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
913 if (obj->is_unlocked()) {
914 if (CheckJNICalls) {
915 fatal("Object has been unlocked by JNI");
916 }
917 return;
918 }
919 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
920 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
921 // again at method exit or in the case of an exception.
922 elem->set_obj(nullptr);
923 JRT_END
924
925 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
926 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
927 JRT_END
928
929 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
930 // Returns an illegal exception to install into the current thread. The
931 // pending_exception flag is cleared so normal exception handling does not
932 // trigger. Any current installed exception will be overwritten. This
933 // method will be called during an exception unwind.
934
935 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
936 Handle exception(current, current->vm_result());
937 assert(exception() != nullptr, "vm result should be set");
938 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
939 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
940 current->set_vm_result(exception());
941 JRT_END
942
943 JRT_ENTRY(void, InterpreterRuntime::throw_identity_exception(JavaThread* current, oopDesc* obj))
944 Klass* klass = cast_to_oop(obj)->klass();
945 ResourceMark rm(THREAD);
946 const char* desc = "Cannot synchronize on an instance of value class ";
947 const char* className = klass->external_name();
948 size_t msglen = strlen(desc) + strlen(className) + 1;
949 char* message = NEW_RESOURCE_ARRAY(char, msglen);
950 if (nullptr == message) {
951 // Out of memory: can't create detailed error message
952 THROW_MSG(vmSymbols::java_lang_IdentityException(), className);
953 } else {
954 jio_snprintf(message, msglen, "%s%s", desc, className);
955 THROW_MSG(vmSymbols::java_lang_IdentityException(), message);
956 }
957 JRT_END
958
959 //------------------------------------------------------------------------------------------------------------------------
960 // Invokes
961
962 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
963 return method->orig_bytecode_at(method->bci_from(bcp));
964 JRT_END
965
966 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
967 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
968 JRT_END
969
970 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
971 JvmtiExport::post_raw_breakpoint(current, method, bcp);
972 JRT_END
973
974 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
975 LastFrameAccessor last_frame(current);
976 // extract receiver from the outgoing argument list if necessary
977 Handle receiver(current, nullptr);
1330 LastFrameAccessor last_frame(current);
1331 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1332 }
1333 JRT_END
1334
1335 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1336 assert(current == JavaThread::current(), "pre-condition");
1337 // This function is called by the interpreter when the return poll found a reason
1338 // to call the VM. The reason could be that we are returning into a not yet safe
1339 // to access frame. We handle that below.
1340 // Note that this path does not check for single stepping, because we do not want
1341 // to single step when unwinding frames for an exception being thrown. Instead,
1342 // such single stepping code will use the safepoint table, which will use the
1343 // InterpreterRuntime::at_safepoint callback.
1344 StackWatermarkSet::before_unwind(current);
1345 JRT_END
1346
1347 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1348 ResolvedFieldEntry *entry))
1349
1350 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
1351 // check the access_flags for the field in the klass
1352
1353 InstanceKlass* ik = entry->field_holder();
1354 int index = entry->field_index();
1355 if (!ik->field_status(index).is_access_watched()) return;
1356
1357 bool is_static = (obj == nullptr);
1358 bool is_flat = entry->is_flat();
1359 HandleMark hm(current);
1360
1361 Handle h_obj;
1362 if (!is_static) {
1363 // non-static field accessors have an object, but we need a handle
1364 h_obj = Handle(current, obj);
1365 }
1366 InstanceKlass* field_holder = entry->field_holder(); // HERE
1367 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static, is_flat);
1368 LastFrameAccessor last_frame(current);
1369 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1370 JRT_END
1371
1372 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1373 ResolvedFieldEntry *entry, jvalue *value))
1374
1375 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
1376 InstanceKlass* ik = entry->field_holder();
1377
1378 // check the access_flags for the field in the klass
1379 int index = entry->field_index();
1380 // bail out if field modifications are not watched
1381 if (!ik->field_status(index).is_modification_watched()) return;
1382
1383 char sig_type = '\0';
1384
1385 switch((TosState)entry->tos_state()) {
1386 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1387 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1388 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1389 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1390 case itos: sig_type = JVM_SIGNATURE_INT; break;
1391 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1392 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1393 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1394 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1395 default: ShouldNotReachHere(); return;
1396 }
1397
1398 bool is_static = (obj == nullptr);
1399 bool is_flat = entry->is_flat();
1400
1401 HandleMark hm(current);
1402 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static, is_flat);
1403 jvalue fvalue;
1404 #ifdef _LP64
1405 fvalue = *value;
1406 #else
1407 // Long/double values are stored unaligned and also noncontiguously with
1408 // tagged stacks. We can't just do a simple assignment even in the non-
1409 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1410 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1411 // We assume that the two halves of longs/doubles are stored in interpreter
1412 // stack slots in platform-endian order.
1413 jlong_accessor u;
1414 jint* newval = (jint*)value;
1415 u.words[0] = newval[0];
1416 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1417 fvalue.j = u.long_value;
1418 #endif // _LP64
1419
1420 Handle h_obj;
1421 if (!is_static) {
1422 // non-static field accessors have an object, but we need a handle
|