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 "classfile/javaClasses.inline.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "classfile/systemDictionary.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/flatArrayKlass.hpp"
49 #include "oops/flatArrayOop.inline.hpp"
50 #include "oops/inlineKlass.inline.hpp"
51 #include "oops/instanceKlass.inline.hpp"
52 #include "oops/klass.inline.hpp"
53 #include "oops/methodData.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/methodHandles.hpp"
61 #include "prims/nativeLookup.hpp"
62 #include "runtime/atomic.hpp"
63 #include "runtime/continuation.hpp"
64 #include "runtime/deoptimization.hpp"
65 #include "runtime/fieldDescriptor.inline.hpp"
66 #include "runtime/frame.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/icache.hpp"
69 #include "runtime/interfaceSupport.inline.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/jfieldIDWorkaround.hpp"
73 #include "runtime/osThread.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/stackWatermarkSet.hpp"
76 #include "runtime/stubRoutines.hpp"
77 #include "runtime/synchronizer.inline.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/checkedCast.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #if INCLUDE_JFR
84 #include "jfr/jfr.inline.hpp"
85 #endif
86
87 // Helper class to access current interpreter state
88 class LastFrameAccessor : public StackObj {
89 frame _last_frame;
90 public:
91 LastFrameAccessor(JavaThread* current) {
92 assert(current == Thread::current(), "sanity");
93 _last_frame = current->last_frame();
94 }
95 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
96 Method* method() const { return _last_frame.interpreter_frame_method(); }
97 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
98 int bci() const { return _last_frame.interpreter_frame_bci(); }
99 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
100
101 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
102 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
103
104 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
105 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
106
107 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
108 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
109 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
110 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
111 int number_of_dimensions() const { return bcp()[3]; }
112
113 oop callee_receiver(Symbol* signature) {
114 return _last_frame.interpreter_callee_receiver(signature);
115 }
116 BasicObjectLock* monitor_begin() const {
117 return _last_frame.interpreter_frame_monitor_begin();
118 }
119 BasicObjectLock* monitor_end() const {
120 return _last_frame.interpreter_frame_monitor_end();
121 }
122 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
123 return _last_frame.next_monitor_in_interpreter_frame(current);
124 }
125
126 frame& get_frame() { return _last_frame; }
127 };
128
129 //------------------------------------------------------------------------------------------------------------------------
130 // State accessors
131
132 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
133 LastFrameAccessor last_frame(current);
134 last_frame.set_bcp(bcp);
135 if (ProfileInterpreter) {
136 // ProfileTraps uses MDOs independently of ProfileInterpreter.
137 // That is why we must check both ProfileInterpreter and mdo != nullptr.
138 MethodData* mdo = last_frame.method()->method_data();
139 if (mdo != nullptr) {
140 NEEDS_CLEANUP;
141 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
142 }
143 }
144 }
145
146 //------------------------------------------------------------------------------------------------------------------------
147 // Constants
148
149
150 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
151 // access constant pool
152 LastFrameAccessor last_frame(current);
153 ConstantPool* pool = last_frame.method()->constants();
154 int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
155 constantTag tag = pool->tag_at(cp_index);
156
157 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
158 Klass* klass = pool->klass_at(cp_index, CHECK);
159 oop java_class = klass->java_mirror();
160 current->set_vm_result_oop(java_class);
161 JRT_END
162
163 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
164 assert(bytecode == Bytecodes::_ldc ||
165 bytecode == Bytecodes::_ldc_w ||
166 bytecode == Bytecodes::_ldc2_w ||
167 bytecode == Bytecodes::_fast_aldc ||
168 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
169 ResourceMark rm(current);
170 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
171 bytecode == Bytecodes::_fast_aldc_w);
172 LastFrameAccessor last_frame(current);
173 methodHandle m (current, last_frame.method());
174 Bytecode_loadconstant ldc(m, last_frame.bci());
175
176 // Double-check the size. (Condy can have any type.)
177 BasicType type = ldc.result_type();
178 switch (type2size[type]) {
179 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
180 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
181 default: ShouldNotReachHere();
182 }
183
184 // Resolve the constant. This does not do unboxing.
185 // But it does replace Universe::the_null_sentinel by null.
186 oop result = ldc.resolve_constant(CHECK);
187 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
188
189 #ifdef ASSERT
190 {
191 // The bytecode wrappers aren't GC-safe so construct a new one
192 Bytecode_loadconstant ldc2(m, last_frame.bci());
193 int rindex = ldc2.cache_index();
194 if (rindex < 0)
195 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
196 if (rindex >= 0) {
197 oop coop = m->constants()->resolved_reference_at(rindex);
198 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
199 assert(roop == coop, "expected result for assembly code");
200 }
201 }
202 #endif
203 current->set_vm_result_oop(result);
204 if (!is_fast_aldc) {
205 // Tell the interpreter how to unbox the primitive.
206 guarantee(java_lang_boxing_object::is_instance(result, type), "");
207 int offset = java_lang_boxing_object::value_offset(type);
208 intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift)
209 | (offset & ConstantPoolCache::field_index_mask));
210 current->set_vm_result_metadata((Metadata*)flags);
211 }
212 }
213 JRT_END
214
215
216 //------------------------------------------------------------------------------------------------------------------------
217 // Allocation
218
219 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
220 Klass* k = pool->klass_at(index, CHECK);
221 InstanceKlass* klass = InstanceKlass::cast(k);
222
223 // Make sure we are not instantiating an abstract klass
224 klass->check_valid_for_instantiation(true, CHECK);
225
226 // Make sure klass is initialized
227 klass->initialize(CHECK);
228
229 oop obj = klass->allocate_instance(CHECK);
230 current->set_vm_result_oop(obj);
231 JRT_END
232
233 JRT_ENTRY(void, InterpreterRuntime::read_flat_field(JavaThread* current, oopDesc* obj, ResolvedFieldEntry* entry))
234 assert(oopDesc::is_oop(obj), "Sanity check");
235 Handle obj_h(THREAD, obj);
236
237 InstanceKlass* holder = InstanceKlass::cast(entry->field_holder());
238 assert(entry->field_holder()->field_is_flat(entry->field_index()), "Sanity check");
239
240 InlineLayoutInfo* layout_info = holder->inline_layout_info_adr(entry->field_index());
241 InlineKlass* field_vklass = layout_info->klass();
242
243 #ifdef ASSERT
244 fieldDescriptor fd;
245 bool found = holder->find_field_from_offset(entry->field_offset(), false, &fd);
246 assert(found, "Field not found");
247 assert(fd.is_flat(), "Field must be flat");
248 #endif // ASSERT
249
250 oop res = field_vklass->read_payload_from_addr(obj_h(), entry->field_offset(), layout_info->kind(), CHECK);
251 current->set_vm_result_oop(res);
252 JRT_END
253
254 JRT_ENTRY(void, InterpreterRuntime::write_flat_field(JavaThread* current, oopDesc* obj, oopDesc* value, ResolvedFieldEntry* entry))
255 assert(oopDesc::is_oop(obj), "Sanity check");
256 Handle obj_h(THREAD, obj);
257 assert(value == nullptr || oopDesc::is_oop(value), "Sanity check");
258 Handle val_h(THREAD, value);
259
260 InstanceKlass* holder = entry->field_holder();
261 InlineLayoutInfo* li = holder->inline_layout_info_adr(entry->field_index());
262 InlineKlass* vk = li->klass();
263 vk->write_value_to_addr(val_h(), ((char*)(oopDesc*)obj_h()) + entry->field_offset(), li->kind(), true, CHECK);
264 JRT_END
265
266 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
267 oop obj = oopFactory::new_typeArray(type, size, CHECK);
268 current->set_vm_result_oop(obj);
269 JRT_END
270
271
272 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
273 Klass* klass = pool->klass_at(index, CHECK);
274 arrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
275 current->set_vm_result_oop(obj);
276 JRT_END
277
278 JRT_ENTRY(void, InterpreterRuntime::flat_array_load(JavaThread* current, arrayOopDesc* array, int index))
279 assert(array->is_flatArray(), "Must be");
280 flatArrayOop farray = (flatArrayOop)array;
281 oop res = farray->obj_at(index, CHECK);
282 current->set_vm_result_oop(res);
283 JRT_END
284
285 JRT_ENTRY(void, InterpreterRuntime::flat_array_store(JavaThread* current, oopDesc* val, arrayOopDesc* array, int index))
286 assert(array->is_flatArray(), "Must be");
287 flatArrayOop farray = (flatArrayOop)array;
288 farray->obj_at_put(index, val, CHECK);
289 JRT_END
290
291 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
292 // We may want to pass in more arguments - could make this slightly faster
293 LastFrameAccessor last_frame(current);
294 ConstantPool* constants = last_frame.method()->constants();
295 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
296 Klass* klass = constants->klass_at(i, CHECK);
297 int nof_dims = last_frame.number_of_dimensions();
298 assert(klass->is_klass(), "not a class");
299 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
300
301 // We must create an array of jints to pass to multi_allocate.
302 ResourceMark rm(current);
303 const int small_dims = 10;
304 jint dim_array[small_dims];
305 jint *dims = &dim_array[0];
306 if (nof_dims > small_dims) {
307 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
308 }
309 for (int index = 0; index < nof_dims; index++) {
310 // offset from first_size_address is addressed as local[index]
311 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
312 dims[index] = first_size_address[n];
313 }
314 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
315 current->set_vm_result_oop(obj);
316 JRT_END
317
318
319 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
320 assert(oopDesc::is_oop(obj), "must be a valid oop");
321 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
322 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
323 JRT_END
324
325 JRT_ENTRY(jboolean, InterpreterRuntime::is_substitutable(JavaThread* current, oopDesc* aobj, oopDesc* bobj))
326 assert(oopDesc::is_oop(aobj) && oopDesc::is_oop(bobj), "must be valid oops");
327
328 Handle ha(THREAD, aobj);
329 Handle hb(THREAD, bobj);
330 JavaValue result(T_BOOLEAN);
331 JavaCallArguments args;
332 args.push_oop(ha);
333 args.push_oop(hb);
334 methodHandle method(current, Universe::is_substitutable_method());
335 method->method_holder()->initialize(CHECK_false); // Ensure class ValueObjectMethods is initialized
336 JavaCalls::call(&result, method, &args, THREAD);
337 if (HAS_PENDING_EXCEPTION) {
338 // Something really bad happened because isSubstitutable() should not throw exceptions
339 // If it is an error, just let it propagate
340 // If it is an exception, wrap it into an InternalError
341 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
342 Handle e(THREAD, PENDING_EXCEPTION);
343 CLEAR_PENDING_EXCEPTION;
344 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in substitutability test", e, false);
345 }
346 }
347 return result.get_jboolean();
348 JRT_END
349
350 // Quicken instance-of and check-cast bytecodes
351 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
352 // Force resolving; quicken the bytecode
353 LastFrameAccessor last_frame(current);
354 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
355 ConstantPool* cpool = last_frame.method()->constants();
356 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
357 // program we might have seen an unquick'd bytecode in the interpreter but have another
358 // thread quicken the bytecode before we get here.
359 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
360 Klass* klass = cpool->klass_at(which, CHECK);
361 current->set_vm_result_metadata(klass);
362 JRT_END
363
364
365 //------------------------------------------------------------------------------------------------------------------------
366 // Exceptions
367
368 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
369 const methodHandle& trap_method, int trap_bci) {
370 if (trap_method.not_null()) {
371 MethodData* trap_mdo = trap_method->method_data();
372 if (trap_mdo == nullptr) {
373 ExceptionMark em(current);
374 JavaThread* THREAD = current; // For exception macros.
375 Method::build_profiling_method_data(trap_method, THREAD);
376 if (HAS_PENDING_EXCEPTION) {
377 // Only metaspace OOM is expected. No Java code executed.
378 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
379 "we expect only an OOM error here");
380 CLEAR_PENDING_EXCEPTION;
381 }
382 trap_mdo = trap_method->method_data();
383 // and fall through...
384 }
385 if (trap_mdo != nullptr) {
386 // Update per-method count of trap events. The interpreter
387 // is updating the MDO to simulate the effect of compiler traps.
388 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
389 }
390 }
391 }
392
393 // Assume the compiler is (or will be) interested in this event.
394 // If necessary, create an MDO to hold the information, and record it.
395 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
396 assert(ProfileTraps, "call me only if profiling");
397 LastFrameAccessor last_frame(current);
398 methodHandle trap_method(current, last_frame.method());
399 int trap_bci = trap_method->bci_from(last_frame.bcp());
400 note_trap_inner(current, reason, trap_method, trap_bci);
401 }
402
403 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
404 // get klass
405 InstanceKlass* klass = InstanceKlass::cast(k);
406 assert(klass->is_initialized(),
407 "this klass should have been initialized during VM initialization");
408 // create instance - do not call constructor since we may have no
409 // (java) stack space left (should assert constructor is empty)
410 Handle exception;
411 oop exception_oop = klass->allocate_instance(CHECK_(exception));
412 exception = Handle(THREAD, exception_oop);
413 if (StackTraceInThrowable) {
414 java_lang_Throwable::fill_in_stack_trace(exception);
415 }
416 return exception;
417 }
418
419 // Special handling for stack overflow: since we don't have any (java) stack
420 // space left we use the pre-allocated & pre-initialized StackOverflowError
421 // klass to create an stack overflow error instance. We do not call its
422 // constructor for the same reason (it is empty, anyway).
423 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
424 Handle exception = get_preinitialized_exception(
425 vmClasses::StackOverflowError_klass(),
426 CHECK);
427 // Increment counter for hs_err file reporting
428 Atomic::inc(&Exceptions::_stack_overflow_errors);
429 // Remove the ScopedValue bindings in case we got a StackOverflowError
430 // while we were trying to manipulate ScopedValue bindings.
431 current->clear_scopedValueBindings();
432 THROW_HANDLE(exception);
433 JRT_END
434
435 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
436 Handle exception = get_preinitialized_exception(
437 vmClasses::StackOverflowError_klass(),
438 CHECK);
439 java_lang_Throwable::set_message(exception(),
440 Universe::delayed_stack_overflow_error_message());
441 // Increment counter for hs_err file reporting
442 Atomic::inc(&Exceptions::_stack_overflow_errors);
443 // Remove the ScopedValue bindings in case we got a StackOverflowError
444 // while we were trying to manipulate ScopedValue bindings.
445 current->clear_scopedValueBindings();
446 THROW_HANDLE(exception);
447 JRT_END
448
449 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
450 // lookup exception klass
451 TempNewSymbol s = SymbolTable::new_symbol(name);
452 if (ProfileTraps) {
453 if (s == vmSymbols::java_lang_ArithmeticException()) {
454 note_trap(current, Deoptimization::Reason_div0_check);
455 } else if (s == vmSymbols::java_lang_NullPointerException()) {
456 note_trap(current, Deoptimization::Reason_null_check);
457 }
458 }
459 // create exception
460 Handle exception = Exceptions::new_exception(current, s, message);
461 current->set_vm_result_oop(exception());
462 JRT_END
463
464
465 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
466 // Produce the error message first because note_trap can safepoint
467 ResourceMark rm(current);
468 const char* klass_name = obj->klass()->external_name();
469 // lookup exception klass
470 TempNewSymbol s = SymbolTable::new_symbol(name);
471 if (ProfileTraps) {
472 if (s == vmSymbols::java_lang_ArrayStoreException()) {
473 note_trap(current, Deoptimization::Reason_array_check);
474 } else {
475 note_trap(current, Deoptimization::Reason_class_check);
476 }
477 }
478 // create exception, with klass name as detail message
479 Handle exception = Exceptions::new_exception(current, s, klass_name);
480 current->set_vm_result_oop(exception());
481 JRT_END
482
483 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
484 // Produce the error message first because note_trap can safepoint
485 ResourceMark rm(current);
486 stringStream ss;
487 ss.print("Index %d out of bounds for length %d", index, a->length());
488
489 if (ProfileTraps) {
490 note_trap(current, Deoptimization::Reason_range_check);
491 }
492
493 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
494 JRT_END
495
496 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
497 JavaThread* current, oopDesc* obj))
498
499 // Produce the error message first because note_trap can safepoint
500 ResourceMark rm(current);
501 char* message = SharedRuntime::generate_class_cast_message(
502 current, obj->klass());
503
504 if (ProfileTraps) {
505 note_trap(current, Deoptimization::Reason_class_check);
506 }
507
508 // create exception
509 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
510 JRT_END
511
512 // exception_handler_for_exception(...) returns the continuation address,
513 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
514 // The exception oop is returned to make sure it is preserved over GC (it
515 // is only on the stack if the exception was thrown explicitly via athrow).
516 // During this operation, the expression stack contains the values for the
517 // bci where the exception happened. If the exception was propagated back
518 // from a call, the expression stack contains the values for the bci at the
519 // invoke w/o arguments (i.e., as if one were inside the call).
520 // Note that the implementation of this method assumes it's only called when an exception has actually occured
521 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
522 // We get here after we have unwound from a callee throwing an exception
523 // into the interpreter. Any deferred stack processing is notified of
524 // the event via the StackWatermarkSet.
525 StackWatermarkSet::after_unwind(current);
526
527 LastFrameAccessor last_frame(current);
528 Handle h_exception(current, exception);
529 methodHandle h_method (current, last_frame.method());
530 constantPoolHandle h_constants(current, h_method->constants());
531 bool should_repeat;
532 int handler_bci;
533 int current_bci = last_frame.bci();
534
535 if (current->frames_to_pop_failed_realloc() > 0) {
536 // Allocation of scalar replaced object used in this frame
537 // failed. Unconditionally pop the frame.
538 current->dec_frames_to_pop_failed_realloc();
539 current->set_vm_result_oop(h_exception());
540 // If the method is synchronized we already unlocked the monitor
541 // during deoptimization so the interpreter needs to skip it when
542 // the frame is popped.
543 current->set_do_not_unlock_if_synchronized(true);
544 return Interpreter::remove_activation_entry();
545 }
546
547 // Need to do this check first since when _do_not_unlock_if_synchronized
548 // is set, we don't want to trigger any classloading which may make calls
549 // into java, or surprisingly find a matching exception handler for bci 0
550 // since at this moment the method hasn't been "officially" entered yet.
551 if (current->do_not_unlock_if_synchronized()) {
552 ResourceMark rm;
553 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
554 current->set_vm_result_oop(exception);
555 return Interpreter::remove_activation_entry();
556 }
557
558 do {
559 should_repeat = false;
560
561 // assertions
562 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
563 // Check that exception is a subclass of Throwable.
564 assert(h_exception->is_a(vmClasses::Throwable_klass()),
565 "Exception not subclass of Throwable");
566
567 // tracing
568 if (log_is_enabled(Info, exceptions)) {
569 ResourceMark rm(current);
570 stringStream tempst;
571 tempst.print("interpreter method <%s>\n"
572 " at bci %d for thread " INTPTR_FORMAT " (%s)",
573 h_method->print_value_string(), current_bci, p2i(current), current->name());
574 Exceptions::log_exception(h_exception, tempst.as_string());
575 }
576 if (log_is_enabled(Info, exceptions, stacktrace)) {
577 Exceptions::log_exception_stacktrace(h_exception, h_method, current_bci);
578 }
579
580 // Don't go paging in something which won't be used.
581 // else if (extable->length() == 0) {
582 // // disabled for now - interpreter is not using shortcut yet
583 // // (shortcut is not to call runtime if we have no exception handlers)
584 // // warning("performance bug: should not call runtime if method has no exception handlers");
585 // }
586 // for AbortVMOnException flag
587 Exceptions::debug_check_abort(h_exception);
588
589 // exception handler lookup
590 Klass* klass = h_exception->klass();
591 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
592 if (HAS_PENDING_EXCEPTION) {
593 // We threw an exception while trying to find the exception handler.
594 // Transfer the new exception to the exception handle which will
595 // be set into thread local storage, and do another lookup for an
596 // exception handler for this exception, this time starting at the
597 // BCI of the exception handler which caused the exception to be
598 // thrown (bug 4307310).
599 h_exception = Handle(THREAD, PENDING_EXCEPTION);
600 CLEAR_PENDING_EXCEPTION;
601 if (handler_bci >= 0) {
602 current_bci = handler_bci;
603 should_repeat = true;
604 }
605 }
606 } while (should_repeat == true);
607
608 #if INCLUDE_JVMCI
609 if (EnableJVMCI && h_method->method_data() != nullptr) {
610 ResourceMark rm(current);
611 MethodData* mdo = h_method->method_data();
612
613 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
614 MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
615
616 ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
617 if (pdata != nullptr && pdata->is_BitData()) {
618 BitData* bit_data = (BitData*) pdata;
619 bit_data->set_exception_seen();
620 }
621 }
622 #endif
623
624 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
625 // time throw or a stack unwinding throw and accordingly notify the debugger
626 if (JvmtiExport::can_post_on_exceptions()) {
627 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
628 }
629
630 address continuation = nullptr;
631 address handler_pc = nullptr;
632 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
633 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
634 // handler in this method, or (b) after a stack overflow there is not yet
635 // enough stack space available to reprotect the stack.
636 continuation = Interpreter::remove_activation_entry();
637 #if COMPILER2_OR_JVMCI
638 // Count this for compilation purposes
639 h_method->interpreter_throwout_increment(THREAD);
640 #endif
641 } else {
642 // handler in this method => change bci/bcp to handler bci/bcp and continue there
643 handler_pc = h_method->code_base() + handler_bci;
644 h_method->set_exception_handler_entered(handler_bci); // profiling
645 #ifndef ZERO
646 set_bcp_and_mdp(handler_pc, current);
647 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
648 #else
649 continuation = (address)(intptr_t) handler_bci;
650 #endif
651 }
652
653 // notify debugger of an exception catch
654 // (this is good for exceptions caught in native methods as well)
655 if (JvmtiExport::can_post_on_exceptions()) {
656 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
657 }
658
659 current->set_vm_result_oop(h_exception());
660 return continuation;
661 JRT_END
662
663
664 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
665 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
666 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
667 JRT_END
668
669
670 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
671 THROW(vmSymbols::java_lang_AbstractMethodError());
672 JRT_END
673
674 // This method is called from the "abstract_entry" of the interpreter.
675 // At that point, the arguments have already been removed from the stack
676 // and therefore we don't have the receiver object at our fingertips. (Though,
677 // on some platforms the receiver still resides in a register...). Thus,
678 // we have no choice but print an error message not containing the receiver
679 // type.
680 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
681 Method* missingMethod))
682 ResourceMark rm(current);
683 assert(missingMethod != nullptr, "sanity");
684 methodHandle m(current, missingMethod);
685 LinkResolver::throw_abstract_method_error(m, THREAD);
686 JRT_END
687
688 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
689 Klass* recvKlass,
690 Method* missingMethod))
691 ResourceMark rm(current);
692 methodHandle mh = methodHandle(current, missingMethod);
693 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
694 JRT_END
695
696 JRT_ENTRY(void, InterpreterRuntime::throw_InstantiationError(JavaThread* current))
697 THROW(vmSymbols::java_lang_InstantiationError());
698 JRT_END
699
700
701 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
702 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
703 JRT_END
704
705 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
706 Klass* recvKlass,
707 Klass* interfaceKlass))
708 ResourceMark rm(current);
709 char buf[1000];
710 buf[0] = '\0';
711 jio_snprintf(buf, sizeof(buf),
712 "Class %s does not implement the requested interface %s",
713 recvKlass ? recvKlass->external_name() : "nullptr",
714 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
715 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
716 JRT_END
717
718 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
719 THROW(vmSymbols::java_lang_NullPointerException());
720 JRT_END
721
722 //------------------------------------------------------------------------------------------------------------------------
723 // Fields
724 //
725
726 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
727 LastFrameAccessor last_frame(current);
728 constantPoolHandle pool(current, last_frame.method()->constants());
729 methodHandle m(current, last_frame.method());
730
731 resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, true /*initialize_holder*/, current);
732 }
733
734 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
735 methodHandle& m,
736 constantPoolHandle& pool,
737 bool initialize_holder, TRAPS) {
738 fieldDescriptor info;
739 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
740 bytecode == Bytecodes::_putstatic);
741 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
742
743 {
744 JvmtiHideSingleStepping jhss(THREAD);
745 LinkResolver::resolve_field_access(info, pool, field_index,
746 m, bytecode, initialize_holder, CHECK);
747 } // end JvmtiHideSingleStepping
748
749 // check if link resolution caused cpCache to be updated
750 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
751
752 // compute auxiliary field attributes
753 TosState state = as_TosState(info.field_type());
754
755 // Resolution of put instructions on final fields is delayed. That is required so that
756 // exceptions are thrown at the correct place (when the instruction is actually invoked).
757 // If we do not resolve an instruction in the current pass, leaving the put_code
758 // set to zero will cause the next put instruction to the same field to reresolve.
759
760 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
761 // to final instance fields with updates originating from a method different than <init>)
762 // is inhibited. A putfield instruction targeting an instance final field must throw
763 // an IllegalAccessError if the instruction is not in an instance
764 // initializer method <init>. If resolution were not inhibited, a putfield
765 // in an initializer method could be resolved in the initializer. Subsequent
766 // putfield instructions to the same field would then use cached information.
767 // As a result, those instructions would not pass through the VM. That is,
768 // checks in resolve_field_access() would not be executed for those instructions
769 // and the required IllegalAccessError would not be thrown.
770 //
771 // Also, we need to delay resolving getstatic and putstatic instructions until the
772 // class is initialized. This is required so that access to the static
773 // field will call the initialization function every time until the class
774 // is completely initialized ala. in 2.17.5 in JVM Specification.
775 InstanceKlass* klass = info.field_holder();
776 bool uninitialized_static = is_static && !klass->is_initialized();
777 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
778 info.has_initialized_final_update();
779 bool strict_static_final = info.is_strict() && info.is_static() && info.is_final();
780 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
781
782 Bytecodes::Code get_code = (Bytecodes::Code)0;
783 Bytecodes::Code put_code = (Bytecodes::Code)0;
784 if (!uninitialized_static) {
785 if (is_static) {
786 get_code = Bytecodes::_getstatic;
787 } else {
788 get_code = Bytecodes::_getfield;
789 }
790 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
791 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
792 }
793 assert(!info.is_strict_static_unset(), "after initialization, no unset flags");
794 } else if (is_static && (info.is_strict_static_unset() || strict_static_final)) {
795 // During <clinit>, closely track the state of strict statics.
796 // 1. if we are reading an uninitialized strict static, throw
797 // 2. if we are writing one, clear the "unset" flag
798 //
799 // Note: If we were handling an attempted write of a null to a
800 // null-restricted strict static, we would NOT clear the "unset"
801 // flag.
802 assert(klass->is_being_initialized(), "else should have thrown");
803 assert(klass->is_reentrant_initialization(THREAD),
804 "<clinit> must be running in current thread");
805 klass->notify_strict_static_access(info.index(), is_put, CHECK);
806 }
807
808 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
809 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile(),
810 info.is_flat(), info.is_null_free_inline_type(),
811 info.has_null_marker());
812
813 entry->fill_in(info.field_holder(), info.offset(),
814 checked_cast<u2>(info.index()), checked_cast<u1>(state),
815 static_cast<u1>(get_code), static_cast<u1>(put_code));
816 }
817
818
819 //------------------------------------------------------------------------------------------------------------------------
820 // Synchronization
821 //
822 // The interpreter's synchronization code is factored out so that it can
823 // be shared by method invocation and synchronized blocks.
824 //%note synchronization_3
825
826 //%note monitor_1
827 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
828 #ifdef ASSERT
829 current->last_frame().interpreter_frame_verify_monitor(elem);
830 #endif
831 Handle h_obj(current, elem->obj());
832 assert(Universe::heap()->is_in_or_null(h_obj()),
833 "must be null or an object");
834 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
835 assert(Universe::heap()->is_in_or_null(elem->obj()),
836 "must be null or an object");
837 #ifdef ASSERT
838 if (!current->preempting()) current->last_frame().interpreter_frame_verify_monitor(elem);
839 #endif
840 JRT_END
841
842 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
843 oop obj = elem->obj();
844 assert(Universe::heap()->is_in(obj), "must be an object");
845 // The object could become unlocked through a JNI call, which we have no other checks for.
846 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
847 if (obj->is_unlocked()) {
848 if (CheckJNICalls) {
849 fatal("Object has been unlocked by JNI");
850 }
851 return;
852 }
853 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
854 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
855 // again at method exit or in the case of an exception.
856 elem->set_obj(nullptr);
857 JRT_END
858
859 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
860 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
861 JRT_END
862
863 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
864 // Returns an illegal exception to install into the current thread. The
865 // pending_exception flag is cleared so normal exception handling does not
866 // trigger. Any current installed exception will be overwritten. This
867 // method will be called during an exception unwind.
868
869 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
870 Handle exception(current, current->vm_result_oop());
871 assert(exception() != nullptr, "vm result should be set");
872 current->set_vm_result_oop(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
873 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
874 current->set_vm_result_oop(exception());
875 JRT_END
876
877 JRT_ENTRY(void, InterpreterRuntime::throw_identity_exception(JavaThread* current, oopDesc* obj))
878 Klass* klass = cast_to_oop(obj)->klass();
879 ResourceMark rm(THREAD);
880 const char* desc = "Cannot synchronize on an instance of value class ";
881 const char* className = klass->external_name();
882 size_t msglen = strlen(desc) + strlen(className) + 1;
883 char* message = NEW_RESOURCE_ARRAY(char, msglen);
884 if (nullptr == message) {
885 // Out of memory: can't create detailed error message
886 THROW_MSG(vmSymbols::java_lang_IdentityException(), className);
887 } else {
888 jio_snprintf(message, msglen, "%s%s", desc, className);
889 THROW_MSG(vmSymbols::java_lang_IdentityException(), message);
890 }
891 JRT_END
892
893 //------------------------------------------------------------------------------------------------------------------------
894 // Invokes
895
896 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
897 return method->orig_bytecode_at(method->bci_from(bcp));
898 JRT_END
899
900 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
901 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
902 JRT_END
903
904 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
905 JvmtiExport::post_raw_breakpoint(current, method, bcp);
906 JRT_END
907
908 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
909 LastFrameAccessor last_frame(current);
910 // extract receiver from the outgoing argument list if necessary
911 Handle receiver(current, nullptr);
912 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
913 bytecode == Bytecodes::_invokespecial) {
914 ResourceMark rm(current);
915 methodHandle m (current, last_frame.method());
916 Bytecode_invoke call(m, last_frame.bci());
917 Symbol* signature = call.signature();
918 receiver = Handle(current, last_frame.callee_receiver(signature));
919
920 assert(Universe::heap()->is_in_or_null(receiver()),
921 "sanity check");
922 assert(receiver.is_null() ||
923 !Universe::heap()->is_in(receiver->klass()),
924 "sanity check");
925 }
926
927 // resolve method
928 CallInfo info;
929 constantPoolHandle pool(current, last_frame.method()->constants());
930
931 methodHandle resolved_method;
932
933 int method_index = last_frame.get_index_u2(bytecode);
934 {
935 JvmtiHideSingleStepping jhss(current);
936 JavaThread* THREAD = current; // For exception macros.
937 LinkResolver::resolve_invoke(info, receiver, pool,
938 method_index, bytecode,
939 THREAD);
940
941 if (HAS_PENDING_EXCEPTION) {
942 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
943 // Preserve the original exception across the call to note_trap()
944 PreserveExceptionMark pm(current);
945 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
946 note_trap(current, Deoptimization::Reason_null_check);
947 }
948 return;
949 }
950
951 resolved_method = methodHandle(current, info.resolved_method());
952 } // end JvmtiHideSingleStepping
953
954 update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
955 }
956
957 void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
958 methodHandle& resolved_method,
959 constantPoolHandle& pool,
960 int method_index) {
961 // Don't allow safepoints until the method is cached.
962 NoSafepointVerifier nsv;
963
964 // check if link resolution caused cpCache to be updated
965 ConstantPoolCache* cache = pool->cache();
966 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
967
968 #ifdef ASSERT
969 if (bytecode == Bytecodes::_invokeinterface) {
970 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
971 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
972 // (see also CallInfo::set_interface for details)
973 assert(info.call_kind() == CallInfo::vtable_call ||
974 info.call_kind() == CallInfo::direct_call, "");
975 assert(resolved_method->is_final() || info.has_vtable_index(),
976 "should have been set already");
977 } else if (!resolved_method->has_itable_index()) {
978 // Resolved something like CharSequence.toString. Use vtable not itable.
979 assert(info.call_kind() != CallInfo::itable_call, "");
980 } else {
981 // Setup itable entry
982 assert(info.call_kind() == CallInfo::itable_call, "");
983 int index = resolved_method->itable_index();
984 assert(info.itable_index() == index, "");
985 }
986 } else if (bytecode == Bytecodes::_invokespecial) {
987 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
988 } else {
989 assert(info.call_kind() == CallInfo::direct_call ||
990 info.call_kind() == CallInfo::vtable_call, "");
991 }
992 #endif
993 // Get sender and only set cpCache entry to resolved if it is not an
994 // interface. The receiver for invokespecial calls within interface
995 // methods must be checked for every call.
996 InstanceKlass* sender = pool->pool_holder();
997
998 switch (info.call_kind()) {
999 case CallInfo::direct_call:
1000 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
1001 break;
1002 case CallInfo::vtable_call:
1003 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
1004 break;
1005 case CallInfo::itable_call:
1006 cache->set_itable_call(
1007 bytecode,
1008 method_index,
1009 info.resolved_klass(),
1010 resolved_method,
1011 info.itable_index());
1012 break;
1013 default: ShouldNotReachHere();
1014 }
1015 }
1016
1017 void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
1018 constantPoolHandle& pool, TRAPS) {
1019 LinkInfo link_info(pool, method_index, bytecode, CHECK);
1020
1021 if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
1022 CallInfo call_info;
1023 switch (bytecode) {
1024 case Bytecodes::_invokevirtual: LinkResolver::cds_resolve_virtual_call (call_info, link_info, CHECK); break;
1025 case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
1026 case Bytecodes::_invokespecial: LinkResolver::cds_resolve_special_call (call_info, link_info, CHECK); break;
1027
1028 default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
1029 }
1030 methodHandle resolved_method(THREAD, call_info.resolved_method());
1031 guarantee(resolved_method->method_holder()->is_linked(), "");
1032 update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
1033 } else {
1034 // FIXME: why a shared class is not linked yet?
1035 // Can't link it here since there are no guarantees it'll be prelinked on the next run.
1036 ResourceMark rm;
1037 InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
1038 log_info(aot, resolve)("Not resolved: class not linked: %s %s %s",
1039 resolved_iklass->is_shared() ? "is_shared" : "",
1040 resolved_iklass->init_state_name(),
1041 resolved_iklass->external_name());
1042 }
1043 }
1044
1045 // First time execution: Resolve symbols, create a permanent MethodType object.
1046 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
1047 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
1048 LastFrameAccessor last_frame(current);
1049
1050 // resolve method
1051 CallInfo info;
1052 constantPoolHandle pool(current, last_frame.method()->constants());
1053 int method_index = last_frame.get_index_u2(bytecode);
1054 {
1055 JvmtiHideSingleStepping jhss(current);
1056 JavaThread* THREAD = current; // For exception macros.
1057 LinkResolver::resolve_invoke(info, Handle(), pool,
1058 method_index, bytecode,
1059 CHECK);
1060 } // end JvmtiHideSingleStepping
1061
1062 pool->cache()->set_method_handle(method_index, info);
1063 }
1064
1065 void InterpreterRuntime::cds_resolve_invokehandle(int raw_index,
1066 constantPoolHandle& pool, TRAPS) {
1067 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
1068 CallInfo info;
1069 LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
1070
1071 pool->cache()->set_method_handle(raw_index, info);
1072 }
1073
1074 // First time execution: Resolve symbols, create a permanent CallSite object.
1075 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
1076 LastFrameAccessor last_frame(current);
1077 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
1078
1079 // resolve method
1080 CallInfo info;
1081 constantPoolHandle pool(current, last_frame.method()->constants());
1082 int index = last_frame.get_index_u4(bytecode);
1083 {
1084 JvmtiHideSingleStepping jhss(current);
1085 JavaThread* THREAD = current; // For exception macros.
1086 LinkResolver::resolve_invoke(info, Handle(), pool,
1087 index, bytecode, CHECK);
1088 } // end JvmtiHideSingleStepping
1089
1090 pool->cache()->set_dynamic_call(info, index);
1091 }
1092
1093 void InterpreterRuntime::cds_resolve_invokedynamic(int raw_index,
1094 constantPoolHandle& pool, TRAPS) {
1095 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
1096 CallInfo info;
1097 LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
1098 pool->cache()->set_dynamic_call(info, raw_index);
1099 }
1100
1101 // This function is the interface to the assembly code. It returns the resolved
1102 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
1103 // This function will check for redefinition!
1104 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
1105 switch (bytecode) {
1106 case Bytecodes::_getstatic:
1107 case Bytecodes::_putstatic:
1108 case Bytecodes::_getfield:
1109 case Bytecodes::_putfield:
1110 resolve_get_put(current, bytecode);
1111 break;
1112 case Bytecodes::_invokevirtual:
1113 case Bytecodes::_invokespecial:
1114 case Bytecodes::_invokestatic:
1115 case Bytecodes::_invokeinterface:
1116 resolve_invoke(current, bytecode);
1117 break;
1118 case Bytecodes::_invokehandle:
1119 resolve_invokehandle(current);
1120 break;
1121 case Bytecodes::_invokedynamic:
1122 resolve_invokedynamic(current);
1123 break;
1124 default:
1125 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1126 break;
1127 }
1128 }
1129 JRT_END
1130
1131 //------------------------------------------------------------------------------------------------------------------------
1132 // Miscellaneous
1133
1134
1135 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1136 // Enable WXWrite: the function is called directly by interpreter.
1137 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1138
1139 // frequency_counter_overflow_inner can throw async exception.
1140 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1141 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1142 if (branch_bcp != nullptr && nm != nullptr) {
1143 // This was a successful request for an OSR nmethod. Because
1144 // frequency_counter_overflow_inner ends with a safepoint check,
1145 // nm could have been unloaded so look it up again. It's unsafe
1146 // to examine nm directly since it might have been freed and used
1147 // for something else.
1148 LastFrameAccessor last_frame(current);
1149 Method* method = last_frame.method();
1150 int bci = method->bci_from(last_frame.bcp());
1151 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1152 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1153 if (nm != nullptr) {
1154 // in case the transition passed a safepoint we need to barrier this again
1155 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1156 nm = nullptr;
1157 }
1158 }
1159 }
1160 if (nm != nullptr && current->is_interp_only_mode()) {
1161 // Normally we never get an nm if is_interp_only_mode() is true, because
1162 // policy()->event has a check for this and won't compile the method when
1163 // true. However, it's possible for is_interp_only_mode() to become true
1164 // during the compilation. We don't want to return the nm in that case
1165 // because we want to continue to execute interpreted.
1166 nm = nullptr;
1167 }
1168 #ifndef PRODUCT
1169 if (TraceOnStackReplacement) {
1170 if (nm != nullptr) {
1171 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1172 nm->print();
1173 }
1174 }
1175 #endif
1176 return nm;
1177 }
1178
1179 JRT_ENTRY(nmethod*,
1180 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1181 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1182 // flag, in case this method triggers classloading which will call into Java.
1183 UnlockFlagSaver fs(current);
1184
1185 LastFrameAccessor last_frame(current);
1186 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1187 methodHandle method(current, last_frame.method());
1188 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1189 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1190
1191 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1192
1193 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1194 if (osr_nm != nullptr) {
1195 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1196 osr_nm = nullptr;
1197 }
1198 }
1199 return osr_nm;
1200 JRT_END
1201
1202 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1203 assert(ProfileInterpreter, "must be profiling interpreter");
1204 int bci = method->bci_from(cur_bcp);
1205 MethodData* mdo = method->method_data();
1206 if (mdo == nullptr) return 0;
1207 return mdo->bci_to_di(bci);
1208 JRT_END
1209
1210 #ifdef ASSERT
1211 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1212 assert(ProfileInterpreter, "must be profiling interpreter");
1213
1214 MethodData* mdo = method->method_data();
1215 assert(mdo != nullptr, "must not be null");
1216
1217 int bci = method->bci_from(bcp);
1218
1219 address mdp2 = mdo->bci_to_dp(bci);
1220 if (mdp != mdp2) {
1221 ResourceMark rm;
1222 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1223 int current_di = mdo->dp_to_di(mdp);
1224 int expected_di = mdo->dp_to_di(mdp2);
1225 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1226 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1227 int approx_bci = -1;
1228 if (current_di >= 0) {
1229 approx_bci = mdo->data_at(current_di)->bci();
1230 }
1231 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1232 mdo->print_on(tty);
1233 method->print_codes();
1234 }
1235 assert(mdp == mdp2, "wrong mdp");
1236 JRT_END
1237 #endif // ASSERT
1238
1239 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1240 assert(ProfileInterpreter, "must be profiling interpreter");
1241 ResourceMark rm(current);
1242 LastFrameAccessor last_frame(current);
1243 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1244 MethodData* h_mdo = last_frame.method()->method_data();
1245
1246 // Grab a lock to ensure atomic access to setting the return bci and
1247 // the displacement. This can block and GC, invalidating all naked oops.
1248 MutexLocker ml(RetData_lock);
1249
1250 // ProfileData is essentially a wrapper around a derived oop, so we
1251 // need to take the lock before making any ProfileData structures.
1252 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1253 guarantee(data != nullptr, "profile data must be valid");
1254 RetData* rdata = data->as_RetData();
1255 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1256 last_frame.set_mdp(new_mdp);
1257 JRT_END
1258
1259 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1260 return Method::build_method_counters(current, m);
1261 JRT_END
1262
1263
1264 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1265 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1266 // stack traversal automatically takes care of preserving arguments for invoke, so
1267 // this is no longer needed.
1268
1269 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1270 // if this is called during a safepoint
1271
1272 if (JvmtiExport::should_post_single_step()) {
1273 // This function is called by the interpreter when single stepping. Such single
1274 // stepping could unwind a frame. Then, it is important that we process any frames
1275 // that we might return into.
1276 StackWatermarkSet::before_unwind(current);
1277
1278 // We are called during regular safepoints and when the VM is
1279 // single stepping. If any thread is marked for single stepping,
1280 // then we may have JVMTI work to do.
1281 LastFrameAccessor last_frame(current);
1282 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1283 }
1284 JRT_END
1285
1286 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1287 assert(current == JavaThread::current(), "pre-condition");
1288 JFR_ONLY(Jfr::check_and_process_sample_request(current);)
1289 // This function is called by the interpreter when the return poll found a reason
1290 // to call the VM. The reason could be that we are returning into a not yet safe
1291 // to access frame. We handle that below.
1292 // Note that this path does not check for single stepping, because we do not want
1293 // to single step when unwinding frames for an exception being thrown. Instead,
1294 // such single stepping code will use the safepoint table, which will use the
1295 // InterpreterRuntime::at_safepoint callback.
1296 StackWatermarkSet::before_unwind(current);
1297 JRT_END
1298
1299 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1300 ResolvedFieldEntry *entry))
1301
1302 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
1303 // check the access_flags for the field in the klass
1304
1305 InstanceKlass* ik = entry->field_holder();
1306 int index = entry->field_index();
1307 if (!ik->field_status(index).is_access_watched()) return;
1308
1309 bool is_static = (obj == nullptr);
1310 bool is_flat = entry->is_flat();
1311 HandleMark hm(current);
1312
1313 Handle h_obj;
1314 if (!is_static) {
1315 // non-static field accessors have an object, but we need a handle
1316 h_obj = Handle(current, obj);
1317 }
1318 InstanceKlass* field_holder = entry->field_holder(); // HERE
1319 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static, is_flat);
1320 LastFrameAccessor last_frame(current);
1321 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1322 JRT_END
1323
1324 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1325 ResolvedFieldEntry *entry, jvalue *value))
1326
1327 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
1328 InstanceKlass* ik = entry->field_holder();
1329
1330 // check the access_flags for the field in the klass
1331 int index = entry->field_index();
1332 // bail out if field modifications are not watched
1333 if (!ik->field_status(index).is_modification_watched()) return;
1334
1335 char sig_type = '\0';
1336
1337 switch((TosState)entry->tos_state()) {
1338 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1339 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1340 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1341 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1342 case itos: sig_type = JVM_SIGNATURE_INT; break;
1343 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1344 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1345 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1346 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1347 default: ShouldNotReachHere(); return;
1348 }
1349
1350 bool is_static = (obj == nullptr);
1351 bool is_flat = entry->is_flat();
1352
1353 HandleMark hm(current);
1354 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static, is_flat);
1355 jvalue fvalue;
1356 #ifdef _LP64
1357 fvalue = *value;
1358 #else
1359 // Long/double values are stored unaligned and also noncontiguously with
1360 // tagged stacks. We can't just do a simple assignment even in the non-
1361 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1362 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1363 // We assume that the two halves of longs/doubles are stored in interpreter
1364 // stack slots in platform-endian order.
1365 jlong_accessor u;
1366 jint* newval = (jint*)value;
1367 u.words[0] = newval[0];
1368 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1369 fvalue.j = u.long_value;
1370 #endif // _LP64
1371
1372 Handle h_obj;
1373 if (!is_static) {
1374 // non-static field accessors have an object, but we need a handle
1375 h_obj = Handle(current, obj);
1376 }
1377
1378 LastFrameAccessor last_frame(current);
1379 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1380 fid, sig_type, &fvalue);
1381 JRT_END
1382
1383 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1384 LastFrameAccessor last_frame(current);
1385 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1386 JRT_END
1387
1388
1389 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1390 // before transitioning to VM, and restore it after transitioning back
1391 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1392 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1393 LastFrameAccessor last_frame(current);
1394 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1395 JRT_END
1396
1397 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1398 {
1399 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1400 }
1401 JRT_END
1402
1403
1404 // Implementation of SignatureHandlerLibrary
1405
1406 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1407 // Dummy definition (else normalization method is defined in CPU
1408 // dependent code)
1409 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1410 return fingerprint;
1411 }
1412 #endif
1413
1414 address SignatureHandlerLibrary::set_handler_blob() {
1415 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1416 if (handler_blob == nullptr) {
1417 return nullptr;
1418 }
1419 address handler = handler_blob->code_begin();
1420 _handler_blob = handler_blob;
1421 _handler = handler;
1422 return handler;
1423 }
1424
1425 void SignatureHandlerLibrary::initialize() {
1426 if (_fingerprints != nullptr) {
1427 return;
1428 }
1429 if (set_handler_blob() == nullptr) {
1430 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1431 }
1432
1433 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1434 SignatureHandlerLibrary::buffer_size);
1435 _buffer = bb->code_begin();
1436
1437 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1438 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1439 }
1440
1441 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1442 address handler = _handler;
1443 int insts_size = buffer->pure_insts_size();
1444 if (handler + insts_size > _handler_blob->code_end()) {
1445 // get a new handler blob
1446 handler = set_handler_blob();
1447 }
1448 if (handler != nullptr) {
1449 memcpy(handler, buffer->insts_begin(), insts_size);
1450 pd_set_handler(handler);
1451 ICache::invalidate_range(handler, insts_size);
1452 _handler = handler + insts_size;
1453 }
1454 return handler;
1455 }
1456
1457 void SignatureHandlerLibrary::add(const methodHandle& method) {
1458 if (method->signature_handler() == nullptr) {
1459 // use slow signature handler if we can't do better
1460 int handler_index = -1;
1461 // check if we can use customized (fast) signature handler
1462 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1463 // use customized signature handler
1464 MutexLocker mu(SignatureHandlerLibrary_lock);
1465 // make sure data structure is initialized
1466 initialize();
1467 // lookup method signature's fingerprint
1468 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1469 // allow CPU dependent code to optimize the fingerprints for the fast handler
1470 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1471 handler_index = _fingerprints->find(fingerprint);
1472 // create handler if necessary
1473 if (handler_index < 0) {
1474 ResourceMark rm;
1475 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1476 CodeBuffer buffer((address)(_buffer + align_offset),
1477 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1478 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1479 // copy into code heap
1480 address handler = set_handler(&buffer);
1481 if (handler == nullptr) {
1482 // use slow signature handler (without memorizing it in the fingerprints)
1483 } else {
1484 // debugging support
1485 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1486 ttyLocker ttyl;
1487 tty->cr();
1488 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1489 _handlers->length(),
1490 (method->is_static() ? "static" : "receiver"),
1491 method->name_and_sig_as_C_string(),
1492 fingerprint,
1493 buffer.insts_size());
1494 if (buffer.insts_size() > 0) {
1495 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1496 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1497 }
1498 #ifndef PRODUCT
1499 address rh_begin = Interpreter::result_handler(method()->result_type());
1500 if (CodeCache::contains(rh_begin)) {
1501 // else it might be special platform dependent values
1502 tty->print_cr(" --- associated result handler ---");
1503 address rh_end = rh_begin;
1504 while (*(int*)rh_end != 0) {
1505 rh_end += sizeof(int);
1506 }
1507 Disassembler::decode(rh_begin, rh_end);
1508 } else {
1509 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1510 }
1511 #endif
1512 }
1513 // add handler to library
1514 _fingerprints->append(fingerprint);
1515 _handlers->append(handler);
1516 // set handler index
1517 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1518 handler_index = _fingerprints->length() - 1;
1519 }
1520 }
1521 // Set handler under SignatureHandlerLibrary_lock
1522 if (handler_index < 0) {
1523 // use generic signature handler
1524 method->set_signature_handler(Interpreter::slow_signature_handler());
1525 } else {
1526 // set handler
1527 method->set_signature_handler(_handlers->at(handler_index));
1528 }
1529 } else {
1530 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1531 // use generic signature handler
1532 method->set_signature_handler(Interpreter::slow_signature_handler());
1533 }
1534 }
1535 #ifdef ASSERT
1536 int handler_index = -1;
1537 int fingerprint_index = -2;
1538 {
1539 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1540 // in any way if accessed from multiple threads. To avoid races with another
1541 // thread which may change the arrays in the above, mutex protected block, we
1542 // have to protect this read access here with the same mutex as well!
1543 MutexLocker mu(SignatureHandlerLibrary_lock);
1544 if (_handlers != nullptr) {
1545 handler_index = _handlers->find(method->signature_handler());
1546 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1547 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1548 fingerprint_index = _fingerprints->find(fingerprint);
1549 }
1550 }
1551 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1552 handler_index == fingerprint_index, "sanity check");
1553 #endif // ASSERT
1554 }
1555
1556 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1557 address SignatureHandlerLibrary::_handler = nullptr;
1558 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1559 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1560 address SignatureHandlerLibrary::_buffer = nullptr;
1561
1562
1563 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1564 methodHandle m(current, method);
1565 assert(m->is_native(), "sanity check");
1566 // lookup native function entry point if it doesn't exist
1567 if (!m->has_native_function()) {
1568 NativeLookup::lookup(m, CHECK);
1569 }
1570 // make sure signature handler is installed
1571 SignatureHandlerLibrary::add(m);
1572 // The interpreter entry point checks the signature handler first,
1573 // before trying to fetch the native entry point and klass mirror.
1574 // We must set the signature handler last, so that multiple processors
1575 // preparing the same method will be sure to see non-null entry & mirror.
1576 JRT_END
1577
1578 #if defined(IA32) || defined(AMD64) || defined(ARM)
1579 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1580 assert(current == JavaThread::current(), "pre-condition");
1581 if (src_address == dest_address) {
1582 return;
1583 }
1584 ResourceMark rm;
1585 LastFrameAccessor last_frame(current);
1586 assert(last_frame.is_interpreted_frame(), "");
1587 jint bci = last_frame.bci();
1588 methodHandle mh(current, last_frame.method());
1589 Bytecode_invoke invoke(mh, bci);
1590 ArgumentSizeComputer asc(invoke.signature());
1591 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1592 Copy::conjoint_jbytes(src_address, dest_address,
1593 size_of_arguments * Interpreter::stackElementSize);
1594 JRT_END
1595 #endif
1596
1597 #if INCLUDE_JVMTI
1598 // This is a support of the JVMTI PopFrame interface.
1599 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1600 // and return it as a vm_result_oop so that it can be reloaded in the list of invokestatic parameters.
1601 // The member_name argument is a saved reference (in local#0) to the member_name.
1602 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1603 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1604 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1605 Method* method, address bcp))
1606 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1607 if (code != Bytecodes::_invokestatic) {
1608 return;
1609 }
1610 ConstantPool* cpool = method->constants();
1611 int cp_index = Bytes::get_native_u2(bcp + 1);
1612 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1613 Symbol* mname = cpool->name_ref_at(cp_index, code);
1614
1615 if (MethodHandles::has_member_arg(cname, mname)) {
1616 oop member_name_oop = cast_to_oop(member_name);
1617 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1618 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1619 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1620 }
1621 current->set_vm_result_oop(member_name_oop);
1622 } else {
1623 current->set_vm_result_oop(nullptr);
1624 }
1625 JRT_END
1626 #endif // INCLUDE_JVMTI
1627
1628 #ifndef PRODUCT
1629 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1630 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1631 // The generated code still uses call_VM because that will set up the frame pointer for
1632 // bcp and method.
1633 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1634 assert(current == JavaThread::current(), "pre-condition");
1635 LastFrameAccessor last_frame(current);
1636 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1637 methodHandle mh(current, last_frame.method());
1638 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1639 return preserve_this_value;
1640 JRT_END
1641 #endif // !PRODUCT