1 /*
2 * Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "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/oopMapCache.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/method.inline.hpp"
55 #include "oops/methodData.hpp"
56 #include "oops/objArrayKlass.hpp"
57 #include "oops/objArrayOop.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/oopsHierarchy.hpp"
60 #include "oops/symbol.hpp"
61 #include "oops/valuePayload.inline.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "prims/methodHandles.hpp"
64 #include "prims/nativeLookup.hpp"
65 #include "runtime/continuation.hpp"
66 #include "runtime/deoptimization.hpp"
67 #include "runtime/fieldDescriptor.inline.hpp"
68 #include "runtime/frame.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/icache.hpp"
71 #include "runtime/interfaceSupport.inline.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/javaCalls.hpp"
74 #include "runtime/jfieldIDWorkaround.hpp"
75 #include "runtime/osThread.hpp"
76 #include "runtime/sharedRuntime.hpp"
77 #include "runtime/stackWatermarkSet.hpp"
78 #include "runtime/stubRoutines.hpp"
79 #include "runtime/synchronizer.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/exceptions.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #if INCLUDE_JFR
87 #include "jfr/jfr.inline.hpp"
88 #endif
89
90 // Helper class to access current interpreter state
91 class LastFrameAccessor : public StackObj {
92 frame _last_frame;
93 public:
94 LastFrameAccessor(JavaThread* current) {
95 assert(current == Thread::current(), "sanity");
96 _last_frame = current->last_frame();
97 }
98 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
99 Method* method() const { return _last_frame.interpreter_frame_method(); }
100 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
101 int bci() const { return _last_frame.interpreter_frame_bci(); }
102 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
103
104 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
105 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
106
107 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
108 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
109
110 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
111 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
112 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
113 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
114 int number_of_dimensions() const { return bcp()[3]; }
115
116 oop callee_receiver(Symbol* signature) {
117 return _last_frame.interpreter_callee_receiver(signature);
118 }
119 BasicObjectLock* monitor_begin() const {
120 return _last_frame.interpreter_frame_monitor_begin();
121 }
122 BasicObjectLock* monitor_end() const {
123 return _last_frame.interpreter_frame_monitor_end();
124 }
125 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
126 return _last_frame.next_monitor_in_interpreter_frame(current);
127 }
128
129 frame& get_frame() { return _last_frame; }
130 };
131
132 //------------------------------------------------------------------------------------------------------------------------
133 // State accessors
134
135 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
136 LastFrameAccessor last_frame(current);
137 last_frame.set_bcp(bcp);
138 if (ProfileInterpreter) {
139 // ProfileTraps uses MDOs independently of ProfileInterpreter.
140 // That is why we must check both ProfileInterpreter and mdo != nullptr.
141 MethodData* mdo = last_frame.method()->method_data();
142 if (mdo != nullptr) {
143 NEEDS_CLEANUP;
144 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
145 }
146 }
147 }
148
149 //------------------------------------------------------------------------------------------------------------------------
150 // Constants
151
152
153 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
154 // access constant pool
155 LastFrameAccessor last_frame(current);
156 ConstantPool* pool = last_frame.method()->constants();
157 int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
158 constantTag tag = pool->tag_at(cp_index);
159
160 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
161 Klass* klass = pool->klass_at(cp_index, CHECK);
162 oop java_class = klass->java_mirror();
163 current->set_vm_result_oop(java_class);
164 JRT_END
165
166 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
167 assert(bytecode == Bytecodes::_ldc ||
168 bytecode == Bytecodes::_ldc_w ||
169 bytecode == Bytecodes::_ldc2_w ||
170 bytecode == Bytecodes::_fast_aldc ||
171 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
172 ResourceMark rm(current);
173 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
174 bytecode == Bytecodes::_fast_aldc_w);
175 LastFrameAccessor last_frame(current);
176 methodHandle m (current, last_frame.method());
177 Bytecode_loadconstant ldc(m, last_frame.bci());
178
179 // Double-check the size. (Condy can have any type.)
180 BasicType type = ldc.result_type();
181 switch (type2size[type]) {
182 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
183 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
184 default: ShouldNotReachHere();
185 }
186
187 // Resolve the constant. This does not do unboxing.
188 // But it does replace Universe::the_null_sentinel by null.
189 oop result = ldc.resolve_constant(CHECK);
190 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
191
192 #ifdef ASSERT
193 {
194 // The bytecode wrappers aren't GC-safe so construct a new one
195 Bytecode_loadconstant ldc2(m, last_frame.bci());
196 int rindex = ldc2.cache_index();
197 if (rindex < 0)
198 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
199 if (rindex >= 0) {
200 oop coop = m->constants()->resolved_reference_at(rindex);
201 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
202 assert(roop == coop, "expected result for assembly code");
203 }
204 }
205 #endif
206 current->set_vm_result_oop(result);
207 if (!is_fast_aldc) {
208 // Tell the interpreter how to unbox the primitive.
209 guarantee(java_lang_boxing_object::is_instance(result, type), "");
210 int offset = java_lang_boxing_object::value_offset(type);
211 intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift)
212 | (offset & ConstantPoolCache::field_index_mask));
213 current->set_vm_result_metadata((Metadata*)flags);
214 }
215 }
216 JRT_END
217
218
219 //------------------------------------------------------------------------------------------------------------------------
220 // Allocation
221
222 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
223 Klass* k = pool->klass_at(index, CHECK);
224 InstanceKlass* klass = InstanceKlass::cast(k);
225
226 // Make sure we are not instantiating an abstract klass
227 klass->check_valid_for_instantiation(true, CHECK);
228
229 // Make sure klass is initialized
230 klass->initialize_preemptable(CHECK_AND_CLEAR_PREEMPTED);
231
232 oop obj = klass->allocate_instance(CHECK);
233 current->set_vm_result_oop(obj);
234 JRT_END
235
236 JRT_BLOCK_ENTRY(void, InterpreterRuntime::read_flat_field(JavaThread* current, oopDesc* obj, ResolvedFieldEntry* entry))
237 assert(oopDesc::is_oop(obj), "Sanity check");
238
239 FlatFieldPayload payload(instanceOop(obj), entry);
240 if (payload.is_payload_null()) {
241 // If the payload is null return before entering the JRT_BLOCK.
242 current->set_vm_result_oop(nullptr);
243 return;
244 }
245 JRT_BLOCK
246 oop res = payload.read(CHECK);
247 current->set_vm_result_oop(res);
248 JRT_BLOCK_END
249 JRT_END
250
251 JRT_ENTRY(void, InterpreterRuntime::write_flat_field(JavaThread* current, oopDesc* obj, oopDesc* value, ResolvedFieldEntry* entry))
252 assert(oopDesc::is_oop(obj), "Sanity check");
253 assert(oopDesc::is_oop_or_null(value), "Sanity check");
254
255 FlatFieldPayload payload(instanceOop(obj), entry);
256 payload.write(inlineOop(value), CHECK);
257 JRT_END
258
259 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
260 oop obj = oopFactory::new_typeArray(type, size, CHECK);
261 current->set_vm_result_oop(obj);
262 JRT_END
263
264
265 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
266 Klass* klass = pool->klass_at(index, CHECK);
267 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
268 current->set_vm_result_oop(obj);
269 JRT_END
270
271 JRT_ENTRY(void, InterpreterRuntime::flat_array_load(JavaThread* current, arrayOopDesc* array, int index))
272 assert(array->is_flatArray(), "Must be");
273 flatArrayOop farray = (flatArrayOop)array;
274 oop res = farray->obj_at(index, CHECK);
275 current->set_vm_result_oop(res);
276 JRT_END
277
278 JRT_ENTRY(void, InterpreterRuntime::flat_array_store(JavaThread* current, oopDesc* val, arrayOopDesc* array, int index))
279 assert(array->is_flatArray(), "Must be");
280 flatArrayOop farray = (flatArrayOop)array;
281 farray->obj_at_put(index, val, CHECK);
282 JRT_END
283
284 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
285 // We may want to pass in more arguments - could make this slightly faster
286 LastFrameAccessor last_frame(current);
287 ConstantPool* constants = last_frame.method()->constants();
288 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
289 Klass* klass = constants->klass_at(i, CHECK);
290 int nof_dims = last_frame.number_of_dimensions();
291 assert(klass->is_klass(), "not a class");
292 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
293
294 // We must create an array of jints to pass to multi_allocate.
295 ResourceMark rm(current);
296 const int small_dims = 10;
297 jint dim_array[small_dims];
298 jint *dims = &dim_array[0];
299 if (nof_dims > small_dims) {
300 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
301 }
302 for (int index = 0; index < nof_dims; index++) {
303 // offset from first_size_address is addressed as local[index]
304 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
305 dims[index] = first_size_address[n];
306 }
307 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
308 current->set_vm_result_oop(obj);
309 JRT_END
310
311
312 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
313 assert(oopDesc::is_oop(obj), "must be a valid oop");
314 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
315 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
316 JRT_END
317
318 JRT_ENTRY(jboolean, InterpreterRuntime::is_substitutable(JavaThread* current, oopDesc* aobj, oopDesc* bobj))
319 assert(oopDesc::is_oop(aobj) && oopDesc::is_oop(bobj), "must be valid oops");
320
321 Handle ha(THREAD, aobj);
322 Handle hb(THREAD, bobj);
323 JavaValue result(T_BOOLEAN);
324 JavaCallArguments args;
325 args.push_oop(ha);
326 args.push_oop(hb);
327 methodHandle method(current, Universe::is_substitutable_method());
328 method->method_holder()->initialize(CHECK_false); // Ensure class ValueObjectMethods is initialized
329 JavaCalls::call(&result, method, &args, THREAD);
330 Exceptions::wrap_exception_in_internal_error("Internal error in substitutability test", CHECK_false);
331
332 return result.get_jboolean();
333 JRT_END
334
335 // Quicken instance-of and check-cast bytecodes
336 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
337 // Force resolving; quicken the bytecode
338 LastFrameAccessor last_frame(current);
339 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
340 ConstantPool* cpool = last_frame.method()->constants();
341 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
342 // program we might have seen an unquick'd bytecode in the interpreter but have another
343 // thread quicken the bytecode before we get here.
344 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
345 Klass* klass = cpool->klass_at(which, CHECK);
346 current->set_vm_result_metadata(klass);
347 JRT_END
348
349
350 //------------------------------------------------------------------------------------------------------------------------
351 // Exceptions
352
353 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
354 const methodHandle& trap_method, int trap_bci) {
355 if (trap_method.not_null()) {
356 MethodData* trap_mdo = trap_method->method_data();
357 if (trap_mdo == nullptr) {
358 ExceptionMark em(current);
359 JavaThread* THREAD = current; // For exception macros.
360 Method::build_profiling_method_data(trap_method, THREAD);
361 if (HAS_PENDING_EXCEPTION) {
362 // Only metaspace OOM is expected. No Java code executed.
363 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
364 "we expect only an OOM error here");
365 CLEAR_PENDING_EXCEPTION;
366 }
367 trap_mdo = trap_method->method_data();
368 // and fall through...
369 }
370 if (trap_mdo != nullptr) {
371 // Update per-method count of trap events. The interpreter
372 // is updating the MDO to simulate the effect of compiler traps.
373 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
374 }
375 }
376 }
377
378 // Assume the compiler is (or will be) interested in this event.
379 // If necessary, create an MDO to hold the information, and record it.
380 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
381 assert(ProfileTraps, "call me only if profiling");
382 LastFrameAccessor last_frame(current);
383 methodHandle trap_method(current, last_frame.method());
384 int trap_bci = trap_method->bci_from(last_frame.bcp());
385 note_trap_inner(current, reason, trap_method, trap_bci);
386 }
387
388 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
389 // get klass
390 InstanceKlass* klass = InstanceKlass::cast(k);
391 assert(klass->is_initialized(),
392 "this klass should have been initialized during VM initialization");
393 // create instance - do not call constructor since we may have no
394 // (java) stack space left (should assert constructor is empty)
395 Handle exception;
396 oop exception_oop = klass->allocate_instance(CHECK_(exception));
397 exception = Handle(THREAD, exception_oop);
398 if (StackTraceInThrowable) {
399 java_lang_Throwable::fill_in_stack_trace(exception);
400 }
401 return exception;
402 }
403
404 // Special handling for stack overflow: since we don't have any (java) stack
405 // space left we use the pre-allocated & pre-initialized StackOverflowError
406 // klass to create an stack overflow error instance. We do not call its
407 // constructor for the same reason (it is empty, anyway).
408 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
409 Handle exception = get_preinitialized_exception(
410 vmClasses::StackOverflowError_klass(),
411 CHECK);
412 // Increment counter for hs_err file reporting
413 Exceptions::increment_stack_overflow_errors();
414 // Remove the ScopedValue bindings in case we got a StackOverflowError
415 // while we were trying to manipulate ScopedValue bindings.
416 current->clear_scopedValueBindings();
417 THROW_HANDLE(exception);
418 JRT_END
419
420 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
421 Handle exception = get_preinitialized_exception(
422 vmClasses::StackOverflowError_klass(),
423 CHECK);
424 java_lang_Throwable::set_message(exception(),
425 Universe::delayed_stack_overflow_error_message());
426 // Increment counter for hs_err file reporting
427 Exceptions::increment_stack_overflow_errors();
428 // Remove the ScopedValue bindings in case we got a StackOverflowError
429 // while we were trying to manipulate ScopedValue bindings.
430 current->clear_scopedValueBindings();
431 THROW_HANDLE(exception);
432 JRT_END
433
434 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
435 // lookup exception klass
436 TempNewSymbol s = SymbolTable::new_symbol(name);
437 if (ProfileTraps) {
438 if (s == vmSymbols::java_lang_ArithmeticException()) {
439 note_trap(current, Deoptimization::Reason_div0_check);
440 } else if (s == vmSymbols::java_lang_NullPointerException()) {
441 note_trap(current, Deoptimization::Reason_null_check);
442 }
443 }
444 // create exception
445 Handle exception = Exceptions::new_exception(current, s, message);
446 current->set_vm_result_oop(exception());
447 JRT_END
448
449
450 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
451 // Produce the error message first because note_trap can safepoint
452 ResourceMark rm(current);
453 const char* klass_name = obj->klass()->external_name();
454 // lookup exception klass
455 TempNewSymbol s = SymbolTable::new_symbol(name);
456 if (ProfileTraps) {
457 if (s == vmSymbols::java_lang_ArrayStoreException()) {
458 note_trap(current, Deoptimization::Reason_array_check);
459 } else {
460 note_trap(current, Deoptimization::Reason_class_check);
461 }
462 }
463 // create exception, with klass name as detail message
464 Handle exception = Exceptions::new_exception(current, s, klass_name);
465 current->set_vm_result_oop(exception());
466 JRT_END
467
468 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
469 // Produce the error message first because note_trap can safepoint
470 ResourceMark rm(current);
471 stringStream ss;
472 ss.print("Index %d out of bounds for length %d", index, a->length());
473
474 if (ProfileTraps) {
475 note_trap(current, Deoptimization::Reason_range_check);
476 }
477
478 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
479 JRT_END
480
481 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
482 JavaThread* current, oopDesc* obj))
483
484 // Produce the error message first because note_trap can safepoint
485 ResourceMark rm(current);
486 char* message = SharedRuntime::generate_class_cast_message(
487 current, obj->klass());
488
489 if (ProfileTraps) {
490 note_trap(current, Deoptimization::Reason_class_check);
491 }
492
493 // create exception
494 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
495 JRT_END
496
497 // exception_handler_for_exception(...) returns the continuation address,
498 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
499 // The exception oop is returned to make sure it is preserved over GC (it
500 // is only on the stack if the exception was thrown explicitly via athrow).
501 // During this operation, the expression stack contains the values for the
502 // bci where the exception happened. If the exception was propagated back
503 // from a call, the expression stack contains the values for the bci at the
504 // invoke w/o arguments (i.e., as if one were inside the call).
505 // Note that the implementation of this method assumes it's only called when an exception has actually occured
506 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
507 // We get here after we have unwound from a callee throwing an exception
508 // into the interpreter. Any deferred stack processing is notified of
509 // the event via the StackWatermarkSet.
510 StackWatermarkSet::after_unwind(current);
511
512 LastFrameAccessor last_frame(current);
513 Handle h_exception(current, exception);
514 methodHandle h_method (current, last_frame.method());
515 constantPoolHandle h_constants(current, h_method->constants());
516 bool should_repeat;
517 int handler_bci;
518 int current_bci = last_frame.bci();
519
520 if (current->frames_to_pop_failed_realloc() > 0) {
521 // Allocation of scalar replaced object used in this frame
522 // failed. Unconditionally pop the frame.
523 current->dec_frames_to_pop_failed_realloc();
524 current->set_vm_result_oop(h_exception());
525 // If the method is synchronized we already unlocked the monitor
526 // during deoptimization so the interpreter needs to skip it when
527 // the frame is popped.
528 current->set_do_not_unlock_if_synchronized(true);
529 return Interpreter::remove_activation_entry();
530 }
531
532 // Need to do this check first since when _do_not_unlock_if_synchronized
533 // is set, we don't want to trigger any classloading which may make calls
534 // into java, or surprisingly find a matching exception handler for bci 0
535 // since at this moment the method hasn't been "officially" entered yet.
536 if (current->do_not_unlock_if_synchronized()) {
537 ResourceMark rm;
538 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
539 current->set_vm_result_oop(exception);
540 return Interpreter::remove_activation_entry();
541 }
542
543 do {
544 should_repeat = false;
545
546 // assertions
547 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
548 // Check that exception is a subclass of Throwable.
549 assert(h_exception->is_a(vmClasses::Throwable_klass()),
550 "Exception not subclass of Throwable");
551
552 // tracing
553 if (log_is_enabled(Info, exceptions)) {
554 ResourceMark rm(current);
555 stringStream tempst;
556 tempst.print("interpreter method <%s>\n"
557 " at bci %d for thread " INTPTR_FORMAT " (%s)",
558 h_method->print_value_string(), current_bci, p2i(current), current->name());
559 Exceptions::log_exception(h_exception, tempst.as_string());
560 }
561 if (log_is_enabled(Info, exceptions, stacktrace)) {
562 Exceptions::log_exception_stacktrace(h_exception, h_method, current_bci);
563 }
564
565 // Don't go paging in something which won't be used.
566 // else if (extable->length() == 0) {
567 // // disabled for now - interpreter is not using shortcut yet
568 // // (shortcut is not to call runtime if we have no exception handlers)
569 // // warning("performance bug: should not call runtime if method has no exception handlers");
570 // }
571 // for AbortVMOnException flag
572 Exceptions::debug_check_abort(h_exception);
573
574 // exception handler lookup
575 Klass* klass = h_exception->klass();
576 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
577 if (HAS_PENDING_EXCEPTION) {
578 // We threw an exception while trying to find the exception handler.
579 // Transfer the new exception to the exception handle which will
580 // be set into thread local storage, and do another lookup for an
581 // exception handler for this exception, this time starting at the
582 // BCI of the exception handler which caused the exception to be
583 // thrown (bug 4307310).
584 h_exception = Handle(THREAD, PENDING_EXCEPTION);
585 CLEAR_PENDING_EXCEPTION;
586 if (handler_bci >= 0) {
587 current_bci = handler_bci;
588 should_repeat = true;
589 }
590 }
591 } while (should_repeat == true);
592
593 #if INCLUDE_JVMCI
594 if (EnableJVMCI && h_method->method_data() != nullptr) {
595 ResourceMark rm(current);
596 MethodData* mdo = h_method->method_data();
597
598 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
599 MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
600
601 ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
602 if (pdata != nullptr && pdata->is_BitData()) {
603 BitData* bit_data = (BitData*) pdata;
604 bit_data->set_exception_seen();
605 }
606 }
607 #endif
608
609 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
610 // time throw or a stack unwinding throw and accordingly notify the debugger
611 if (JvmtiExport::can_post_on_exceptions()) {
612 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
613 }
614
615 address continuation = nullptr;
616 address handler_pc = nullptr;
617 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
618 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
619 // handler in this method, or (b) after a stack overflow there is not yet
620 // enough stack space available to reprotect the stack.
621 continuation = Interpreter::remove_activation_entry();
622 #if COMPILER2_OR_JVMCI
623 // Count this for compilation purposes
624 h_method->interpreter_throwout_increment(THREAD);
625 #endif
626 } else {
627 // handler in this method => change bci/bcp to handler bci/bcp and continue there
628 handler_pc = h_method->code_base() + handler_bci;
629 h_method->set_exception_handler_entered(handler_bci); // profiling
630 #ifndef ZERO
631 set_bcp_and_mdp(handler_pc, current);
632 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
633 #else
634 continuation = (address)(intptr_t) handler_bci;
635 #endif
636 }
637
638 // notify debugger of an exception catch
639 // (this is good for exceptions caught in native methods as well)
640 if (JvmtiExport::can_post_on_exceptions()) {
641 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
642 }
643
644 current->set_vm_result_oop(h_exception());
645 return continuation;
646 JRT_END
647
648
649 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
650 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
651 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
652 JRT_END
653
654
655 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
656 THROW(vmSymbols::java_lang_AbstractMethodError());
657 JRT_END
658
659 // This method is called from the "abstract_entry" of the interpreter.
660 // At that point, the arguments have already been removed from the stack
661 // and therefore we don't have the receiver object at our fingertips. (Though,
662 // on some platforms the receiver still resides in a register...). Thus,
663 // we have no choice but print an error message not containing the receiver
664 // type.
665 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
666 Method* missingMethod))
667 ResourceMark rm(current);
668 assert(missingMethod != nullptr, "sanity");
669 methodHandle m(current, missingMethod);
670 LinkResolver::throw_abstract_method_error(m, THREAD);
671 JRT_END
672
673 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
674 Klass* recvKlass,
675 Method* missingMethod))
676 ResourceMark rm(current);
677 methodHandle mh = methodHandle(current, missingMethod);
678 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
679 JRT_END
680
681 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
682 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
683 JRT_END
684
685 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
686 Klass* recvKlass,
687 Klass* interfaceKlass))
688 ResourceMark rm(current);
689 char buf[1000];
690 buf[0] = '\0';
691 jio_snprintf(buf, sizeof(buf),
692 "Class %s does not implement the requested interface %s",
693 recvKlass ? recvKlass->external_name() : "nullptr",
694 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
695 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
696 JRT_END
697
698 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
699 THROW(vmSymbols::java_lang_NullPointerException());
700 JRT_END
701
702 //------------------------------------------------------------------------------------------------------------------------
703 // Fields
704 //
705
706 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, TRAPS) {
707 JavaThread* current = THREAD;
708 LastFrameAccessor last_frame(current);
709 constantPoolHandle pool(current, last_frame.method()->constants());
710 methodHandle m(current, last_frame.method());
711
712 resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, ClassInitMode::init_preemptable, THREAD);
713 }
714
715 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
716 methodHandle& m,
717 constantPoolHandle& pool,
718 ClassInitMode init_mode, TRAPS) {
719 fieldDescriptor info;
720 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
721 bytecode == Bytecodes::_putstatic);
722 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
723
724 {
725 JvmtiHideSingleStepping jhss(THREAD);
726 LinkResolver::resolve_field_access(info, pool, field_index, m, bytecode, init_mode, CHECK);
727 } // end JvmtiHideSingleStepping
728
729 // check if link resolution caused cpCache to be updated
730 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
731
732 // compute auxiliary field attributes
733 TosState state = as_TosState(info.field_type());
734
735 // Resolution of put instructions on final fields is delayed. That is required so that
736 // exceptions are thrown at the correct place (when the instruction is actually invoked).
737 // If we do not resolve an instruction in the current pass, leaving the put_code
738 // set to zero will cause the next put instruction to the same field to reresolve.
739
740 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
741 // to final instance fields with updates originating from a method different than <init>)
742 // is inhibited. A putfield instruction targeting an instance final field must throw
743 // an IllegalAccessError if the instruction is not in an instance
744 // initializer method <init>. If resolution were not inhibited, a putfield
745 // in an initializer method could be resolved in the initializer. Subsequent
746 // putfield instructions to the same field would then use cached information.
747 // As a result, those instructions would not pass through the VM. That is,
748 // checks in resolve_field_access() would not be executed for those instructions
749 // and the required IllegalAccessError would not be thrown.
750 //
751 // Also, we need to delay resolving getstatic and putstatic instructions until the
752 // class is initialized. This is required so that access to the static
753 // field will call the initialization function every time until the class
754 // is completely initialized ala. in 2.17.5 in JVM Specification.
755 InstanceKlass* klass = info.field_holder();
756 bool uninitialized_static = is_static && !klass->is_initialized();
757 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
758 info.has_initialized_final_update();
759 bool strict_static_final = info.is_strict() && info.is_static() && info.is_final();
760 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
761
762 Bytecodes::Code get_code = (Bytecodes::Code)0;
763 Bytecodes::Code put_code = (Bytecodes::Code)0;
764 if (uninitialized_static && (info.is_strict_static_unset() || strict_static_final)) {
765 // During <clinit>, closely track the state of strict statics.
766 // 1. if we are reading an uninitialized strict static, throw
767 // 2. if we are writing one, clear the "unset" flag
768 //
769 // Note: If we were handling an attempted write of a null to a
770 // null-restricted strict static, we would NOT clear the "unset"
771 // flag.
772 assert(klass->is_being_initialized(), "else should have thrown");
773 assert(klass->is_reentrant_initialization(THREAD),
774 "<clinit> must be running in current thread");
775 klass->notify_strict_static_access(info.index(), is_put, CHECK);
776 assert(!info.is_strict_static_unset(), "after initialization, no unset flags");
777 } else if (!uninitialized_static || VM_Version::supports_fast_class_init_checks()) {
778 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
779 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
780 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
781 }
782 }
783
784 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
785 entry->fill_in(info, checked_cast<u1>(state),
786 static_cast<u1>(get_code), static_cast<u1>(put_code));
787 }
788
789
790 //------------------------------------------------------------------------------------------------------------------------
791 // Synchronization
792 //
793 // The interpreter's synchronization code is factored out so that it can
794 // be shared by method invocation and synchronized blocks.
795 //%note synchronization_3
796
797 //%note monitor_1
798 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
799 #ifdef ASSERT
800 current->last_frame().interpreter_frame_verify_monitor(elem);
801 #endif
802 Handle h_obj(current, elem->obj());
803 assert(Universe::heap()->is_in_or_null(h_obj()),
804 "must be null or an object");
805 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
806 assert(Universe::heap()->is_in_or_null(elem->obj()),
807 "must be null or an object");
808 #ifdef ASSERT
809 if (!current->preempting()) current->last_frame().interpreter_frame_verify_monitor(elem);
810 #endif
811 JRT_END
812
813 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
814 oop obj = elem->obj();
815 assert(Universe::heap()->is_in(obj), "must be an object");
816 // The object could become unlocked through a JNI call, which we have no other checks for.
817 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
818 if (obj->is_unlocked()) {
819 if (CheckJNICalls) {
820 fatal("Object has been unlocked by JNI");
821 }
822 return;
823 }
824 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
825 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
826 // again at method exit or in the case of an exception.
827 elem->set_obj(nullptr);
828 JRT_END
829
830 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
831 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
832 JRT_END
833
834 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
835 // Returns an illegal exception to install into the current thread. The
836 // pending_exception flag is cleared so normal exception handling does not
837 // trigger. Any current installed exception will be overwritten. This
838 // method will be called during an exception unwind.
839
840 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
841 Handle exception(current, current->vm_result_oop());
842 assert(exception() != nullptr, "vm result should be set");
843 current->set_vm_result_oop(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
844 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
845 current->set_vm_result_oop(exception());
846 JRT_END
847
848 JRT_ENTRY(void, InterpreterRuntime::throw_identity_exception(JavaThread* current, oopDesc* obj))
849 Klass* klass = cast_to_oop(obj)->klass();
850 ResourceMark rm(THREAD);
851 const char* desc = "Cannot synchronize on an instance of value class ";
852 const char* className = klass->external_name();
853 size_t msglen = strlen(desc) + strlen(className) + 1;
854 char* message = NEW_RESOURCE_ARRAY(char, msglen);
855 if (nullptr == message) {
856 // Out of memory: can't create detailed error message
857 THROW_MSG(vmSymbols::java_lang_IdentityException(), className);
858 } else {
859 jio_snprintf(message, msglen, "%s%s", desc, className);
860 THROW_MSG(vmSymbols::java_lang_IdentityException(), message);
861 }
862 JRT_END
863
864 //------------------------------------------------------------------------------------------------------------------------
865 // Invokes
866
867 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
868 return method->orig_bytecode_at(method->bci_from(bcp));
869 JRT_END
870
871 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
872 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
873 JRT_END
874
875 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
876 JvmtiExport::post_raw_breakpoint(current, method, bcp);
877 JRT_END
878
879 void InterpreterRuntime::resolve_invoke(Bytecodes::Code bytecode, TRAPS) {
880 JavaThread* current = THREAD;
881 LastFrameAccessor last_frame(current);
882 // extract receiver from the outgoing argument list if necessary
883 Handle receiver(current, nullptr);
884 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
885 bytecode == Bytecodes::_invokespecial) {
886 ResourceMark rm(current);
887 methodHandle m (current, last_frame.method());
888 Bytecode_invoke call(m, last_frame.bci());
889 Symbol* signature = call.signature();
890 receiver = Handle(current, last_frame.callee_receiver(signature));
891
892 assert(Universe::heap()->is_in_or_null(receiver()),
893 "sanity check");
894 assert(receiver.is_null() ||
895 !Universe::heap()->is_in(receiver->klass()),
896 "sanity check");
897 }
898
899 // resolve method
900 CallInfo info;
901 constantPoolHandle pool(current, last_frame.method()->constants());
902
903 methodHandle resolved_method;
904
905 int method_index = last_frame.get_index_u2(bytecode);
906 {
907 JvmtiHideSingleStepping jhss(current);
908 LinkResolver::resolve_invoke(info, receiver, pool,
909 method_index, bytecode,
910 ClassInitMode::init_preemptable, THREAD);
911
912 if (HAS_PENDING_EXCEPTION) {
913 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
914 // Preserve the original exception across the call to note_trap()
915 PreserveExceptionMark pm(current);
916 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
917 note_trap(current, Deoptimization::Reason_null_check);
918 }
919 return;
920 }
921
922 resolved_method = methodHandle(current, info.resolved_method());
923 } // end JvmtiHideSingleStepping
924
925 update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
926 }
927
928 void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
929 methodHandle& resolved_method,
930 constantPoolHandle& pool,
931 int method_index) {
932 // Don't allow safepoints until the method is cached.
933 NoSafepointVerifier nsv;
934
935 // check if link resolution caused cpCache to be updated
936 ConstantPoolCache* cache = pool->cache();
937 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
938
939 #ifdef ASSERT
940 if (bytecode == Bytecodes::_invokeinterface) {
941 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
942 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
943 // (see also CallInfo::set_interface for details)
944 assert(info.call_kind() == CallInfo::vtable_call ||
945 info.call_kind() == CallInfo::direct_call, "");
946 assert(resolved_method->is_final() || info.has_vtable_index(),
947 "should have been set already");
948 } else if (!resolved_method->has_itable_index()) {
949 // Resolved something like CharSequence.toString. Use vtable not itable.
950 assert(info.call_kind() != CallInfo::itable_call, "");
951 } else {
952 // Setup itable entry
953 assert(info.call_kind() == CallInfo::itable_call, "");
954 int index = resolved_method->itable_index();
955 assert(info.itable_index() == index, "");
956 }
957 } else if (bytecode == Bytecodes::_invokespecial) {
958 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
959 } else {
960 assert(info.call_kind() == CallInfo::direct_call ||
961 info.call_kind() == CallInfo::vtable_call, "");
962 }
963 #endif
964 // Get sender and only set cpCache entry to resolved if it is not an
965 // interface. The receiver for invokespecial calls within interface
966 // methods must be checked for every call.
967 InstanceKlass* sender = pool->pool_holder();
968
969 switch (info.call_kind()) {
970 case CallInfo::direct_call:
971 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
972 break;
973 case CallInfo::vtable_call:
974 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
975 break;
976 case CallInfo::itable_call:
977 cache->set_itable_call(
978 bytecode,
979 method_index,
980 info.resolved_klass(),
981 resolved_method,
982 info.itable_index());
983 break;
984 default: ShouldNotReachHere();
985 }
986 }
987
988 void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
989 constantPoolHandle& pool, TRAPS) {
990 LinkInfo link_info(pool, method_index, bytecode, CHECK);
991
992 if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
993 CallInfo call_info;
994 switch (bytecode) {
995 case Bytecodes::_invokevirtual: LinkResolver::cds_resolve_virtual_call (call_info, link_info, CHECK); break;
996 case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
997 case Bytecodes::_invokestatic: LinkResolver::cds_resolve_static_call (call_info, link_info, CHECK); break;
998 case Bytecodes::_invokespecial: LinkResolver::cds_resolve_special_call (call_info, link_info, CHECK); break;
999
1000 default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
1001 }
1002 methodHandle resolved_method(THREAD, call_info.resolved_method());
1003 guarantee(resolved_method->method_holder()->is_linked(), "");
1004 update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
1005 } else {
1006 // FIXME: why a shared class is not linked yet?
1007 // Can't link it here since there are no guarantees it'll be prelinked on the next run.
1008 ResourceMark rm;
1009 InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
1010 log_info(aot, resolve)("Not resolved: class not linked: %s %s %s",
1011 resolved_iklass->in_aot_cache() ? "in_aot_cache" : "",
1012 resolved_iklass->init_state_name(),
1013 resolved_iklass->external_name());
1014 }
1015 }
1016
1017 // First time execution: Resolve symbols, create a permanent MethodType object.
1018 void InterpreterRuntime::resolve_invokehandle(TRAPS) {
1019 JavaThread* current = THREAD;
1020 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
1021 LastFrameAccessor last_frame(current);
1022
1023 // resolve method
1024 CallInfo info;
1025 constantPoolHandle pool(current, last_frame.method()->constants());
1026 int method_index = last_frame.get_index_u2(bytecode);
1027 {
1028 JvmtiHideSingleStepping jhss(current);
1029 JavaThread* THREAD = current; // For exception macros.
1030 LinkResolver::resolve_invoke(info, Handle(), pool,
1031 method_index, bytecode,
1032 CHECK);
1033 } // end JvmtiHideSingleStepping
1034
1035 pool->cache()->set_method_handle(method_index, info);
1036 }
1037
1038 void InterpreterRuntime::cds_resolve_invokehandle(int raw_index,
1039 constantPoolHandle& pool, TRAPS) {
1040 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
1041 CallInfo info;
1042 LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
1043
1044 pool->cache()->set_method_handle(raw_index, info);
1045 }
1046
1047 // First time execution: Resolve symbols, create a permanent CallSite object.
1048 void InterpreterRuntime::resolve_invokedynamic(TRAPS) {
1049 JavaThread* current = THREAD;
1050 LastFrameAccessor last_frame(current);
1051 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
1052
1053 // resolve method
1054 CallInfo info;
1055 constantPoolHandle pool(current, last_frame.method()->constants());
1056 int index = last_frame.get_index_u4(bytecode);
1057 {
1058 JvmtiHideSingleStepping jhss(current);
1059 JavaThread* THREAD = current; // For exception macros.
1060 LinkResolver::resolve_invoke(info, Handle(), pool,
1061 index, bytecode, CHECK);
1062 } // end JvmtiHideSingleStepping
1063
1064 pool->cache()->set_dynamic_call(info, index);
1065 }
1066
1067 void InterpreterRuntime::cds_resolve_invokedynamic(int raw_index,
1068 constantPoolHandle& pool, TRAPS) {
1069 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
1070 CallInfo info;
1071 LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
1072 pool->cache()->set_dynamic_call(info, raw_index);
1073 }
1074
1075 // This function is the interface to the assembly code. It returns the resolved
1076 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
1077 // This function will check for redefinition!
1078 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
1079 switch (bytecode) {
1080 case Bytecodes::_getstatic:
1081 case Bytecodes::_putstatic:
1082 case Bytecodes::_getfield:
1083 case Bytecodes::_putfield:
1084 resolve_get_put(bytecode, CHECK_AND_CLEAR_PREEMPTED);
1085 break;
1086 case Bytecodes::_invokevirtual:
1087 case Bytecodes::_invokespecial:
1088 case Bytecodes::_invokestatic:
1089 case Bytecodes::_invokeinterface:
1090 resolve_invoke(bytecode, CHECK_AND_CLEAR_PREEMPTED);
1091 break;
1092 case Bytecodes::_invokehandle:
1093 resolve_invokehandle(THREAD);
1094 break;
1095 case Bytecodes::_invokedynamic:
1096 resolve_invokedynamic(THREAD);
1097 break;
1098 default:
1099 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1100 break;
1101 }
1102 }
1103 JRT_END
1104
1105 //------------------------------------------------------------------------------------------------------------------------
1106 // Miscellaneous
1107
1108
1109 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1110 // Enable WXWrite: the function is called directly by interpreter.
1111 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1112
1113 // frequency_counter_overflow_inner can throw async exception.
1114 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1115 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1116 if (branch_bcp != nullptr && nm != nullptr) {
1117 // This was a successful request for an OSR nmethod. Because
1118 // frequency_counter_overflow_inner ends with a safepoint check,
1119 // nm could have been unloaded so look it up again. It's unsafe
1120 // to examine nm directly since it might have been freed and used
1121 // for something else.
1122 LastFrameAccessor last_frame(current);
1123 Method* method = last_frame.method();
1124 int bci = method->bci_from(last_frame.bcp());
1125 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1126 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1127 if (nm != nullptr) {
1128 // in case the transition passed a safepoint we need to barrier this again
1129 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1130 nm = nullptr;
1131 }
1132 }
1133 }
1134 if (nm != nullptr && current->is_interp_only_mode()) {
1135 // Normally we never get an nm if is_interp_only_mode() is true, because
1136 // policy()->event has a check for this and won't compile the method when
1137 // true. However, it's possible for is_interp_only_mode() to become true
1138 // during the compilation. We don't want to return the nm in that case
1139 // because we want to continue to execute interpreted.
1140 nm = nullptr;
1141 }
1142 #ifndef PRODUCT
1143 if (TraceOnStackReplacement) {
1144 if (nm != nullptr) {
1145 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1146 nm->print();
1147 }
1148 }
1149 #endif
1150 return nm;
1151 }
1152
1153 JRT_ENTRY(nmethod*,
1154 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1155 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1156 // flag, in case this method triggers classloading which will call into Java.
1157 UnlockFlagSaver fs(current);
1158
1159 LastFrameAccessor last_frame(current);
1160 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1161 methodHandle method(current, last_frame.method());
1162 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1163 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1164
1165 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1166
1167 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1168 if (osr_nm != nullptr) {
1169 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1170 osr_nm = nullptr;
1171 }
1172 }
1173 return osr_nm;
1174 JRT_END
1175
1176 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1177 assert(ProfileInterpreter, "must be profiling interpreter");
1178 int bci = method->bci_from(cur_bcp);
1179 MethodData* mdo = method->method_data();
1180 if (mdo == nullptr) return 0;
1181 return mdo->bci_to_di(bci);
1182 JRT_END
1183
1184 #ifdef ASSERT
1185 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1186 assert(ProfileInterpreter, "must be profiling interpreter");
1187
1188 MethodData* mdo = method->method_data();
1189 assert(mdo != nullptr, "must not be null");
1190
1191 int bci = method->bci_from(bcp);
1192
1193 address mdp2 = mdo->bci_to_dp(bci);
1194 if (mdp != mdp2) {
1195 ResourceMark rm;
1196 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1197 int current_di = mdo->dp_to_di(mdp);
1198 int expected_di = mdo->dp_to_di(mdp2);
1199 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1200 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1201 int approx_bci = -1;
1202 if (current_di >= 0) {
1203 approx_bci = mdo->data_at(current_di)->bci();
1204 }
1205 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1206 mdo->print_on(tty);
1207 method->print_codes();
1208 }
1209 assert(mdp == mdp2, "wrong mdp");
1210 JRT_END
1211 #endif // ASSERT
1212
1213 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1214 assert(ProfileInterpreter, "must be profiling interpreter");
1215 ResourceMark rm(current);
1216 LastFrameAccessor last_frame(current);
1217 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1218 MethodData* h_mdo = last_frame.method()->method_data();
1219
1220 // Grab a lock to ensure atomic access to setting the return bci and
1221 // the displacement. This can block and GC, invalidating all naked oops.
1222 MutexLocker ml(RetData_lock);
1223
1224 // ProfileData is essentially a wrapper around a derived oop, so we
1225 // need to take the lock before making any ProfileData structures.
1226 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1227 guarantee(data != nullptr, "profile data must be valid");
1228 RetData* rdata = data->as_RetData();
1229 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1230 last_frame.set_mdp(new_mdp);
1231 JRT_END
1232
1233 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1234 return Method::build_method_counters(current, m);
1235 JRT_END
1236
1237
1238 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1239 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1240 // stack traversal automatically takes care of preserving arguments for invoke, so
1241 // this is no longer needed.
1242
1243 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1244 // if this is called during a safepoint
1245
1246 if (JvmtiExport::should_post_single_step()) {
1247 // This function is called by the interpreter when single stepping. Such single
1248 // stepping could unwind a frame. Then, it is important that we process any frames
1249 // that we might return into.
1250 StackWatermarkSet::before_unwind(current);
1251
1252 // We are called during regular safepoints and when the VM is
1253 // single stepping. If any thread is marked for single stepping,
1254 // then we may have JVMTI work to do.
1255 LastFrameAccessor last_frame(current);
1256 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1257 }
1258 JRT_END
1259
1260 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1261 assert(current == JavaThread::current(), "pre-condition");
1262 JFR_ONLY(Jfr::check_and_process_sample_request(current);)
1263 // This function is called by the interpreter when the return poll found a reason
1264 // to call the VM. The reason could be that we are returning into a not yet safe
1265 // to access frame. We handle that below.
1266 // Note that this path does not check for single stepping, because we do not want
1267 // to single step when unwinding frames for an exception being thrown. Instead,
1268 // such single stepping code will use the safepoint table, which will use the
1269 // InterpreterRuntime::at_safepoint callback.
1270 StackWatermarkSet::before_unwind(current);
1271 JRT_END
1272
1273 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1274 ResolvedFieldEntry* entry))
1275
1276 // check the access_flags for the field in the klass
1277 InstanceKlass* ik = entry->field_holder();
1278 int index = entry->field_index();
1279 if (!ik->field_status(index).is_access_watched()) return;
1280
1281 bool is_static = (obj == nullptr);
1282 bool is_flat = entry->is_flat();
1283 HandleMark hm(current);
1284
1285 Handle h_obj;
1286 if (!is_static) {
1287 // non-static field accessors have an object, but we need a handle
1288 h_obj = Handle(current, obj);
1289 }
1290 InstanceKlass* field_holder = entry->field_holder(); // HERE
1291 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static, is_flat);
1292 LastFrameAccessor last_frame(current);
1293 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1294 JRT_END
1295
1296 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1297 ResolvedFieldEntry* entry, jvalue* value))
1298
1299 // check the access_flags for the field in the klass
1300 InstanceKlass* ik = entry->field_holder();
1301 int index = entry->field_index();
1302 // bail out if field modifications are not watched
1303 if (!ik->field_status(index).is_modification_watched()) return;
1304
1305 char sig_type = '\0';
1306
1307 switch((TosState)entry->tos_state()) {
1308 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1309 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1310 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1311 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1312 case itos: sig_type = JVM_SIGNATURE_INT; break;
1313 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1314 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1315 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1316 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1317 default: ShouldNotReachHere(); return;
1318 }
1319
1320 bool is_static = (obj == nullptr);
1321 bool is_flat = entry->is_flat();
1322
1323 HandleMark hm(current);
1324 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static, is_flat);
1325 jvalue fvalue;
1326 #ifdef _LP64
1327 fvalue = *value;
1328 #else
1329 // Long/double values are stored unaligned and also noncontiguously with
1330 // tagged stacks. We can't just do a simple assignment even in the non-
1331 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1332 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1333 // We assume that the two halves of longs/doubles are stored in interpreter
1334 // stack slots in platform-endian order.
1335 jlong_accessor u;
1336 jint* newval = (jint*)value;
1337 u.words[0] = newval[0];
1338 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1339 fvalue.j = u.long_value;
1340 #endif // _LP64
1341
1342 Handle h_obj;
1343 if (!is_static) {
1344 // non-static field accessors have an object, but we need a handle
1345 h_obj = Handle(current, obj);
1346 }
1347
1348 LastFrameAccessor last_frame(current);
1349 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1350 fid, sig_type, &fvalue);
1351 JRT_END
1352
1353 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1354 LastFrameAccessor last_frame(current);
1355 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1356 JRT_END
1357
1358
1359 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1360 // before transitioning to VM, and restore it after transitioning back
1361 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1362 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1363 LastFrameAccessor last_frame(current);
1364 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1365 JRT_END
1366
1367 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1368 {
1369 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1370 }
1371 JRT_END
1372
1373
1374 // Implementation of SignatureHandlerLibrary
1375
1376 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1377 // Dummy definition (else normalization method is defined in CPU
1378 // dependent code)
1379 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1380 return fingerprint;
1381 }
1382 #endif
1383
1384 address SignatureHandlerLibrary::set_handler_blob() {
1385 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1386 if (handler_blob == nullptr) {
1387 return nullptr;
1388 }
1389 address handler = handler_blob->code_begin();
1390 _handler_blob = handler_blob;
1391 _handler = handler;
1392 return handler;
1393 }
1394
1395 void SignatureHandlerLibrary::initialize() {
1396 if (_fingerprints != nullptr) {
1397 return;
1398 }
1399 if (set_handler_blob() == nullptr) {
1400 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1401 }
1402
1403 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1404 SignatureHandlerLibrary::buffer_size);
1405 _buffer = bb->code_begin();
1406
1407 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1408 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1409 }
1410
1411 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1412 address handler = _handler;
1413 int insts_size = buffer->pure_insts_size();
1414 if (handler + insts_size > _handler_blob->code_end()) {
1415 // get a new handler blob
1416 handler = set_handler_blob();
1417 }
1418 if (handler != nullptr) {
1419 memcpy(handler, buffer->insts_begin(), insts_size);
1420 pd_set_handler(handler);
1421 ICache::invalidate_range(handler, insts_size);
1422 _handler = handler + insts_size;
1423 }
1424 return handler;
1425 }
1426
1427 void SignatureHandlerLibrary::add(const methodHandle& method) {
1428 if (method->signature_handler() == nullptr) {
1429 // use slow signature handler if we can't do better
1430 int handler_index = -1;
1431 // check if we can use customized (fast) signature handler
1432 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1433 // use customized signature handler
1434 MutexLocker mu(SignatureHandlerLibrary_lock);
1435 // make sure data structure is initialized
1436 initialize();
1437 // lookup method signature's fingerprint
1438 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1439 // allow CPU dependent code to optimize the fingerprints for the fast handler
1440 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1441 handler_index = _fingerprints->find(fingerprint);
1442 // create handler if necessary
1443 if (handler_index < 0) {
1444 ResourceMark rm;
1445 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1446 CodeBuffer buffer((address)(_buffer + align_offset),
1447 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1448 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1449 // copy into code heap
1450 address handler = set_handler(&buffer);
1451 if (handler == nullptr) {
1452 // use slow signature handler (without memorizing it in the fingerprints)
1453 } else {
1454 // debugging support
1455 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1456 ttyLocker ttyl;
1457 tty->cr();
1458 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1459 _handlers->length(),
1460 (method->is_static() ? "static" : "receiver"),
1461 method->name_and_sig_as_C_string(),
1462 fingerprint,
1463 buffer.insts_size());
1464 if (buffer.insts_size() > 0) {
1465 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1466 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1467 }
1468 #ifndef PRODUCT
1469 address rh_begin = Interpreter::result_handler(method()->result_type());
1470 if (CodeCache::contains(rh_begin)) {
1471 // else it might be special platform dependent values
1472 tty->print_cr(" --- associated result handler ---");
1473 address rh_end = rh_begin;
1474 while (*(int*)rh_end != 0) {
1475 rh_end += sizeof(int);
1476 }
1477 Disassembler::decode(rh_begin, rh_end);
1478 } else {
1479 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1480 }
1481 #endif
1482 }
1483 // add handler to library
1484 _fingerprints->append(fingerprint);
1485 _handlers->append(handler);
1486 // set handler index
1487 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1488 handler_index = _fingerprints->length() - 1;
1489 }
1490 }
1491 // Set handler under SignatureHandlerLibrary_lock
1492 if (handler_index < 0) {
1493 // use generic signature handler
1494 method->set_signature_handler(Interpreter::slow_signature_handler());
1495 } else {
1496 // set handler
1497 method->set_signature_handler(_handlers->at(handler_index));
1498 }
1499 } else {
1500 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1501 // use generic signature handler
1502 method->set_signature_handler(Interpreter::slow_signature_handler());
1503 }
1504 }
1505 #ifdef ASSERT
1506 int handler_index = -1;
1507 int fingerprint_index = -2;
1508 {
1509 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1510 // in any way if accessed from multiple threads. To avoid races with another
1511 // thread which may change the arrays in the above, mutex protected block, we
1512 // have to protect this read access here with the same mutex as well!
1513 MutexLocker mu(SignatureHandlerLibrary_lock);
1514 if (_handlers != nullptr) {
1515 handler_index = _handlers->find(method->signature_handler());
1516 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1517 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1518 fingerprint_index = _fingerprints->find(fingerprint);
1519 }
1520 }
1521 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1522 handler_index == fingerprint_index, "sanity check");
1523 #endif // ASSERT
1524 }
1525
1526 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1527 address SignatureHandlerLibrary::_handler = nullptr;
1528 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1529 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1530 address SignatureHandlerLibrary::_buffer = nullptr;
1531
1532
1533 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1534 methodHandle m(current, method);
1535 assert(m->is_native(), "sanity check");
1536 // lookup native function entry point if it doesn't exist
1537 if (!m->has_native_function()) {
1538 NativeLookup::lookup(m, CHECK);
1539 }
1540 // make sure signature handler is installed
1541 SignatureHandlerLibrary::add(m);
1542 // The interpreter entry point checks the signature handler first,
1543 // before trying to fetch the native entry point and klass mirror.
1544 // We must set the signature handler last, so that multiple processors
1545 // preparing the same method will be sure to see non-null entry & mirror.
1546 JRT_END
1547
1548 #if defined(AMD64) || defined(ARM)
1549 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1550 assert(current == JavaThread::current(), "pre-condition");
1551 if (src_address == dest_address) {
1552 return;
1553 }
1554 ResourceMark rm;
1555 LastFrameAccessor last_frame(current);
1556 assert(last_frame.is_interpreted_frame(), "");
1557 jint bci = last_frame.bci();
1558 methodHandle mh(current, last_frame.method());
1559 Bytecode_invoke invoke(mh, bci);
1560 ArgumentSizeComputer asc(invoke.signature());
1561 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1562 Copy::conjoint_jbytes(src_address, dest_address,
1563 size_of_arguments * Interpreter::stackElementSize);
1564 JRT_END
1565 #endif
1566
1567 #if INCLUDE_JVMTI
1568 // This is a support of the JVMTI PopFrame interface.
1569 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1570 // and return it as a vm_result_oop so that it can be reloaded in the list of invokestatic parameters.
1571 // The member_name argument is a saved reference (in local#0) to the member_name.
1572 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1573 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1574 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1575 Method* method, address bcp))
1576 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1577 if (code != Bytecodes::_invokestatic) {
1578 current->set_vm_result_oop(nullptr);
1579 return;
1580 }
1581
1582 ConstantPool* cpool = method->constants();
1583 int cp_index = Bytes::get_native_u2(bcp + 1);
1584 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1585 Symbol* mname = cpool->name_ref_at(cp_index, code);
1586
1587 if (!MethodHandles::has_member_arg(cname, mname)) {
1588 current->set_vm_result_oop(nullptr);
1589 return;
1590 }
1591
1592 oop member_name_oop = cast_to_oop(member_name);
1593
1594 guarantee(member_name_oop != nullptr, "member_name_oop should not be nullptr");
1595 guarantee(oopDesc::is_oop(member_name_oop), "member_name_oop should be an oop");
1596 guarantee(java_lang_invoke_MemberName::is_instance(member_name_oop) ||
1597 java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop),
1598 "member_name_oop is not MemberName or DMH");
1599
1600 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1601 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1602 }
1603 current->set_vm_result_oop(member_name_oop);
1604 JRT_END
1605 #endif // INCLUDE_JVMTI
1606
1607 #ifndef PRODUCT
1608 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1609 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1610 // The generated code still uses call_VM because that will set up the frame pointer for
1611 // bcp and method.
1612 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1613 assert(current == JavaThread::current(), "pre-condition");
1614 LastFrameAccessor last_frame(current);
1615 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1616 methodHandle mh(current, last_frame.method());
1617 stringStream st;
1618 BytecodeTracer::trace_interpreter(mh, last_frame.get_frame().real_fp(), last_frame.bcp(), tos, tos2, &st);
1619 tty->print("%s", st.freeze());
1620 return preserve_this_value;
1621 JRT_END
1622 #endif // !PRODUCT
1623
1624 #ifdef ASSERT
1625 bool InterpreterRuntime::is_preemptable_call(address entry_point) {
1626 return entry_point == CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter) ||
1627 entry_point == CAST_FROM_FN_PTR(address, InterpreterRuntime::resolve_from_cache) ||
1628 entry_point == CAST_FROM_FN_PTR(address, InterpreterRuntime::_new);
1629 }
1630
1631 void InterpreterRuntime::generate_oop_map_alot() {
1632 JavaThread* current = JavaThread::current();
1633 LastFrameAccessor last_frame(current);
1634 if (last_frame.is_interpreted_frame()) {
1635 ResourceMark rm(current);
1636 InterpreterOopMap mask;
1637 methodHandle mh(current, last_frame.method());
1638 int bci = last_frame.bci();
1639 log_info(generateoopmap)("Generating oopmap for method %s at bci %d", mh->name_and_sig_as_C_string(), bci);
1640 OopMapCache::compute_one_oop_map(mh, bci, &mask);
1641 }
1642 }
1643 #endif // ASSERT