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