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