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