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