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 //------------------------------------------------------------------------------------------------------------------------
123 // State accessors
124
125 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
126 LastFrameAccessor last_frame(current);
127 last_frame.set_bcp(bcp);
128 if (ProfileInterpreter) {
129 // ProfileTraps uses MDOs independently of ProfileInterpreter.
130 // That is why we must check both ProfileInterpreter and mdo != nullptr.
131 MethodData* mdo = last_frame.method()->method_data();
132 if (mdo != nullptr) {
133 NEEDS_CLEANUP;
134 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
135 }
136 }
137 }
138
139 //------------------------------------------------------------------------------------------------------------------------
140 // Constants
141
142
143 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
144 // access constant pool
145 LastFrameAccessor last_frame(current);
146 ConstantPool* pool = last_frame.method()->constants();
147 int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
148 constantTag tag = pool->tag_at(cp_index);
149
150 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
151 Klass* klass = pool->klass_at(cp_index, CHECK);
152 oop java_class = klass->java_mirror();
153 current->set_vm_result(java_class);
154 JRT_END
155
156 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
157 assert(bytecode == Bytecodes::_ldc ||
158 bytecode == Bytecodes::_ldc_w ||
159 bytecode == Bytecodes::_ldc2_w ||
160 bytecode == Bytecodes::_fast_aldc ||
161 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
162 ResourceMark rm(current);
163 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
164 bytecode == Bytecodes::_fast_aldc_w);
165 LastFrameAccessor last_frame(current);
166 methodHandle m (current, last_frame.method());
167 Bytecode_loadconstant ldc(m, last_frame.bci());
168
169 // Double-check the size. (Condy can have any type.)
170 BasicType type = ldc.result_type();
171 switch (type2size[type]) {
172 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
173 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
174 default: ShouldNotReachHere();
175 }
176
177 // Resolve the constant. This does not do unboxing.
178 // But it does replace Universe::the_null_sentinel by null.
179 oop result = ldc.resolve_constant(CHECK);
180 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
181
182 #ifdef ASSERT
183 {
184 // The bytecode wrappers aren't GC-safe so construct a new one
185 Bytecode_loadconstant ldc2(m, last_frame.bci());
186 int rindex = ldc2.cache_index();
187 if (rindex < 0)
188 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
189 if (rindex >= 0) {
190 oop coop = m->constants()->resolved_reference_at(rindex);
191 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
192 assert(roop == coop, "expected result for assembly code");
193 }
194 }
195 #endif
196 current->set_vm_result(result);
197 if (!is_fast_aldc) {
198 // Tell the interpreter how to unbox the primitive.
199 guarantee(java_lang_boxing_object::is_instance(result, type), "");
200 int offset = java_lang_boxing_object::value_offset(type);
201 intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift)
202 | (offset & ConstantPoolCache::field_index_mask));
203 current->set_vm_result_2((Metadata*)flags);
204 }
205 }
206 JRT_END
207
208
209 //------------------------------------------------------------------------------------------------------------------------
210 // Allocation
211
212 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
213 Klass* k = pool->klass_at(index, CHECK);
214 InstanceKlass* klass = InstanceKlass::cast(k);
215
216 // Make sure we are not instantiating an abstract klass
217 klass->check_valid_for_instantiation(true, CHECK);
218
219 // Make sure klass is initialized
220 klass->initialize(CHECK);
221
222 oop obj = klass->allocate_instance(CHECK);
223 current->set_vm_result(obj);
224 JRT_END
225
226
227 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
228 oop obj = oopFactory::new_typeArray(type, size, CHECK);
229 current->set_vm_result(obj);
230 JRT_END
231
232
233 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
234 Klass* klass = pool->klass_at(index, CHECK);
235 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
236 current->set_vm_result(obj);
237 JRT_END
238
239
240 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
241 // We may want to pass in more arguments - could make this slightly faster
242 LastFrameAccessor last_frame(current);
243 ConstantPool* constants = last_frame.method()->constants();
244 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
245 Klass* klass = constants->klass_at(i, CHECK);
246 int nof_dims = last_frame.number_of_dimensions();
247 assert(klass->is_klass(), "not a class");
248 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
249
250 // We must create an array of jints to pass to multi_allocate.
251 ResourceMark rm(current);
252 const int small_dims = 10;
253 jint dim_array[small_dims];
254 jint *dims = &dim_array[0];
255 if (nof_dims > small_dims) {
256 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
257 }
258 for (int index = 0; index < nof_dims; index++) {
259 // offset from first_size_address is addressed as local[index]
260 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
261 dims[index] = first_size_address[n];
262 }
263 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
264 current->set_vm_result(obj);
265 JRT_END
266
267
268 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
269 assert(oopDesc::is_oop(obj), "must be a valid oop");
270 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
271 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
272 JRT_END
273
274
275 // Quicken instance-of and check-cast bytecodes
276 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
277 // Force resolving; quicken the bytecode
278 LastFrameAccessor last_frame(current);
279 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
280 ConstantPool* cpool = last_frame.method()->constants();
281 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
282 // program we might have seen an unquick'd bytecode in the interpreter but have another
283 // thread quicken the bytecode before we get here.
284 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
285 Klass* klass = cpool->klass_at(which, CHECK);
286 current->set_vm_result_2(klass);
287 JRT_END
288
289
290 //------------------------------------------------------------------------------------------------------------------------
291 // Exceptions
292
293 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
294 const methodHandle& trap_method, int trap_bci) {
295 if (trap_method.not_null()) {
296 MethodData* trap_mdo = trap_method->method_data();
297 if (trap_mdo == nullptr) {
298 ExceptionMark em(current);
299 JavaThread* THREAD = current; // For exception macros.
300 Method::build_profiling_method_data(trap_method, THREAD);
301 if (HAS_PENDING_EXCEPTION) {
302 // Only metaspace OOM is expected. No Java code executed.
303 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
304 "we expect only an OOM error here");
305 CLEAR_PENDING_EXCEPTION;
306 }
307 trap_mdo = trap_method->method_data();
308 // and fall through...
309 }
310 if (trap_mdo != nullptr) {
311 // Update per-method count of trap events. The interpreter
312 // is updating the MDO to simulate the effect of compiler traps.
313 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
314 }
315 }
316 }
317
318 // Assume the compiler is (or will be) interested in this event.
319 // If necessary, create an MDO to hold the information, and record it.
320 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
321 assert(ProfileTraps, "call me only if profiling");
322 LastFrameAccessor last_frame(current);
323 methodHandle trap_method(current, last_frame.method());
324 int trap_bci = trap_method->bci_from(last_frame.bcp());
325 note_trap_inner(current, reason, trap_method, trap_bci);
326 }
327
328 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
329 // get klass
330 InstanceKlass* klass = InstanceKlass::cast(k);
331 assert(klass->is_initialized(),
332 "this klass should have been initialized during VM initialization");
333 // create instance - do not call constructor since we may have no
334 // (java) stack space left (should assert constructor is empty)
335 Handle exception;
336 oop exception_oop = klass->allocate_instance(CHECK_(exception));
337 exception = Handle(THREAD, exception_oop);
338 if (StackTraceInThrowable) {
339 java_lang_Throwable::fill_in_stack_trace(exception);
340 }
341 return exception;
342 }
343
344 // Special handling for stack overflow: since we don't have any (java) stack
345 // space left we use the pre-allocated & pre-initialized StackOverflowError
346 // klass to create an stack overflow error instance. We do not call its
347 // constructor for the same reason (it is empty, anyway).
348 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
349 Handle exception = get_preinitialized_exception(
350 vmClasses::StackOverflowError_klass(),
351 CHECK);
352 // Increment counter for hs_err file reporting
353 Atomic::inc(&Exceptions::_stack_overflow_errors);
354 // Remove the ScopedValue bindings in case we got a StackOverflowError
355 // while we were trying to manipulate ScopedValue bindings.
356 current->clear_scopedValueBindings();
357 THROW_HANDLE(exception);
358 JRT_END
359
360 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
361 Handle exception = get_preinitialized_exception(
362 vmClasses::StackOverflowError_klass(),
363 CHECK);
364 java_lang_Throwable::set_message(exception(),
365 Universe::delayed_stack_overflow_error_message());
366 // Increment counter for hs_err file reporting
367 Atomic::inc(&Exceptions::_stack_overflow_errors);
368 // Remove the ScopedValue bindings in case we got a StackOverflowError
369 // while we were trying to manipulate ScopedValue bindings.
370 current->clear_scopedValueBindings();
371 THROW_HANDLE(exception);
372 JRT_END
373
374 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
375 // lookup exception klass
376 TempNewSymbol s = SymbolTable::new_symbol(name);
377 if (ProfileTraps) {
378 if (s == vmSymbols::java_lang_ArithmeticException()) {
379 note_trap(current, Deoptimization::Reason_div0_check);
380 } else if (s == vmSymbols::java_lang_NullPointerException()) {
381 note_trap(current, Deoptimization::Reason_null_check);
382 }
383 }
384 // create exception
385 Handle exception = Exceptions::new_exception(current, s, message);
386 current->set_vm_result(exception());
387 JRT_END
388
389
390 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
391 // Produce the error message first because note_trap can safepoint
392 ResourceMark rm(current);
393 const char* klass_name = obj->klass()->external_name();
394 // lookup exception klass
395 TempNewSymbol s = SymbolTable::new_symbol(name);
396 if (ProfileTraps) {
397 if (s == vmSymbols::java_lang_ArrayStoreException()) {
398 note_trap(current, Deoptimization::Reason_array_check);
399 } else {
400 note_trap(current, Deoptimization::Reason_class_check);
401 }
402 }
403 // create exception, with klass name as detail message
404 Handle exception = Exceptions::new_exception(current, s, klass_name);
405 current->set_vm_result(exception());
406 JRT_END
407
408 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
409 // Produce the error message first because note_trap can safepoint
410 ResourceMark rm(current);
411 stringStream ss;
412 ss.print("Index %d out of bounds for length %d", index, a->length());
413
414 if (ProfileTraps) {
415 note_trap(current, Deoptimization::Reason_range_check);
416 }
417
418 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
419 JRT_END
420
421 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
422 JavaThread* current, oopDesc* obj))
423
424 // Produce the error message first because note_trap can safepoint
425 ResourceMark rm(current);
426 char* message = SharedRuntime::generate_class_cast_message(
427 current, obj->klass());
428
429 if (ProfileTraps) {
430 note_trap(current, Deoptimization::Reason_class_check);
431 }
432
433 // create exception
434 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
435 JRT_END
436
437 // exception_handler_for_exception(...) returns the continuation address,
438 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
439 // The exception oop is returned to make sure it is preserved over GC (it
440 // is only on the stack if the exception was thrown explicitly via athrow).
441 // During this operation, the expression stack contains the values for the
442 // bci where the exception happened. If the exception was propagated back
443 // from a call, the expression stack contains the values for the bci at the
444 // invoke w/o arguments (i.e., as if one were inside the call).
445 // Note that the implementation of this method assumes it's only called when an exception has actually occured
446 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
447 // We get here after we have unwound from a callee throwing an exception
448 // into the interpreter. Any deferred stack processing is notified of
449 // the event via the StackWatermarkSet.
450 StackWatermarkSet::after_unwind(current);
451
452 LastFrameAccessor last_frame(current);
453 Handle h_exception(current, exception);
454 methodHandle h_method (current, last_frame.method());
455 constantPoolHandle h_constants(current, h_method->constants());
456 bool should_repeat;
457 int handler_bci;
458 int current_bci = last_frame.bci();
459
460 if (current->frames_to_pop_failed_realloc() > 0) {
461 // Allocation of scalar replaced object used in this frame
462 // failed. Unconditionally pop the frame.
463 current->dec_frames_to_pop_failed_realloc();
464 current->set_vm_result(h_exception());
465 // If the method is synchronized we already unlocked the monitor
466 // during deoptimization so the interpreter needs to skip it when
467 // the frame is popped.
468 current->set_do_not_unlock_if_synchronized(true);
469 return Interpreter::remove_activation_entry();
470 }
471
472 // Need to do this check first since when _do_not_unlock_if_synchronized
473 // is set, we don't want to trigger any classloading which may make calls
474 // into java, or surprisingly find a matching exception handler for bci 0
475 // since at this moment the method hasn't been "officially" entered yet.
476 if (current->do_not_unlock_if_synchronized()) {
477 ResourceMark rm;
478 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
479 current->set_vm_result(exception);
480 return Interpreter::remove_activation_entry();
481 }
482
483 do {
484 should_repeat = false;
485
486 // assertions
487 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
488 // Check that exception is a subclass of Throwable.
489 assert(h_exception->is_a(vmClasses::Throwable_klass()),
490 "Exception not subclass of Throwable");
491
492 // tracing
493 if (log_is_enabled(Info, exceptions)) {
494 ResourceMark rm(current);
495 stringStream tempst;
496 tempst.print("interpreter method <%s>\n"
497 " at bci %d for thread " INTPTR_FORMAT " (%s)",
498 h_method->print_value_string(), current_bci, p2i(current), current->name());
499 Exceptions::log_exception(h_exception, tempst.as_string());
500 }
501 // Don't go paging in something which won't be used.
502 // else if (extable->length() == 0) {
503 // // disabled for now - interpreter is not using shortcut yet
504 // // (shortcut is not to call runtime if we have no exception handlers)
505 // // warning("performance bug: should not call runtime if method has no exception handlers");
506 // }
507 // for AbortVMOnException flag
508 Exceptions::debug_check_abort(h_exception);
509
510 // exception handler lookup
511 Klass* klass = h_exception->klass();
512 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
513 if (HAS_PENDING_EXCEPTION) {
514 // We threw an exception while trying to find the exception handler.
515 // Transfer the new exception to the exception handle which will
516 // be set into thread local storage, and do another lookup for an
517 // exception handler for this exception, this time starting at the
518 // BCI of the exception handler which caused the exception to be
519 // thrown (bug 4307310).
520 h_exception = Handle(THREAD, PENDING_EXCEPTION);
521 CLEAR_PENDING_EXCEPTION;
522 if (handler_bci >= 0) {
523 current_bci = handler_bci;
524 should_repeat = true;
525 }
526 }
527 } while (should_repeat == true);
528
529 #if INCLUDE_JVMCI
530 if (EnableJVMCI && h_method->method_data() != nullptr) {
531 ResourceMark rm(current);
532 MethodData* mdo = h_method->method_data();
533
534 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
535 MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
536
537 ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
538 if (pdata != nullptr && pdata->is_BitData()) {
539 BitData* bit_data = (BitData*) pdata;
540 bit_data->set_exception_seen();
541 }
542 }
543 #endif
544
545 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
546 // time throw or a stack unwinding throw and accordingly notify the debugger
547 if (JvmtiExport::can_post_on_exceptions()) {
548 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
549 }
550
551 address continuation = nullptr;
552 address handler_pc = nullptr;
553 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
554 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
555 // handler in this method, or (b) after a stack overflow there is not yet
556 // enough stack space available to reprotect the stack.
557 continuation = Interpreter::remove_activation_entry();
558 #if COMPILER2_OR_JVMCI
559 // Count this for compilation purposes
560 h_method->interpreter_throwout_increment(THREAD);
561 #endif
562 } else {
563 // handler in this method => change bci/bcp to handler bci/bcp and continue there
564 handler_pc = h_method->code_base() + handler_bci;
565 h_method->set_exception_handler_entered(handler_bci); // profiling
566 #ifndef ZERO
567 set_bcp_and_mdp(handler_pc, current);
568 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
569 #else
570 continuation = (address)(intptr_t) handler_bci;
571 #endif
572 }
573
574 // notify debugger of an exception catch
575 // (this is good for exceptions caught in native methods as well)
576 if (JvmtiExport::can_post_on_exceptions()) {
577 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
578 }
579
580 current->set_vm_result(h_exception());
581 return continuation;
582 JRT_END
583
584
585 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
586 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
587 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
588 JRT_END
589
590
591 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
592 THROW(vmSymbols::java_lang_AbstractMethodError());
593 JRT_END
594
595 // This method is called from the "abstract_entry" of the interpreter.
596 // At that point, the arguments have already been removed from the stack
597 // and therefore we don't have the receiver object at our fingertips. (Though,
598 // on some platforms the receiver still resides in a register...). Thus,
599 // we have no choice but print an error message not containing the receiver
600 // type.
601 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
602 Method* missingMethod))
603 ResourceMark rm(current);
604 assert(missingMethod != nullptr, "sanity");
605 methodHandle m(current, missingMethod);
606 LinkResolver::throw_abstract_method_error(m, THREAD);
607 JRT_END
608
609 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
610 Klass* recvKlass,
611 Method* missingMethod))
612 ResourceMark rm(current);
613 methodHandle mh = methodHandle(current, missingMethod);
614 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
615 JRT_END
616
617
618 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
619 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
620 JRT_END
621
622 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
623 Klass* recvKlass,
624 Klass* interfaceKlass))
625 ResourceMark rm(current);
626 char buf[1000];
627 buf[0] = '\0';
628 jio_snprintf(buf, sizeof(buf),
629 "Class %s does not implement the requested interface %s",
630 recvKlass ? recvKlass->external_name() : "nullptr",
631 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
632 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
633 JRT_END
634
635 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
636 THROW(vmSymbols::java_lang_NullPointerException());
637 JRT_END
638
639 //------------------------------------------------------------------------------------------------------------------------
640 // Fields
641 //
642
643 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
644 LastFrameAccessor last_frame(current);
645 constantPoolHandle pool(current, last_frame.method()->constants());
646 methodHandle m(current, last_frame.method());
647
648 resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, true /*initialize_holder*/, current);
649 }
650
651 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
652 methodHandle& m,
653 constantPoolHandle& pool,
654 bool initialize_holder, TRAPS) {
655 fieldDescriptor info;
656 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
657 bytecode == Bytecodes::_putstatic);
658 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
659
660 {
661 JvmtiHideSingleStepping jhss(THREAD);
662 LinkResolver::resolve_field_access(info, pool, field_index,
663 m, bytecode, initialize_holder, CHECK);
664 } // end JvmtiHideSingleStepping
665
666 // check if link resolution caused cpCache to be updated
667 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
668
669 // compute auxiliary field attributes
670 TosState state = as_TosState(info.field_type());
671
672 // Resolution of put instructions on final fields is delayed. That is required so that
673 // exceptions are thrown at the correct place (when the instruction is actually invoked).
674 // If we do not resolve an instruction in the current pass, leaving the put_code
675 // set to zero will cause the next put instruction to the same field to reresolve.
676
677 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
678 // to final instance fields with updates originating from a method different than <init>)
679 // is inhibited. A putfield instruction targeting an instance final field must throw
680 // an IllegalAccessError if the instruction is not in an instance
681 // initializer method <init>. If resolution were not inhibited, a putfield
682 // in an initializer method could be resolved in the initializer. Subsequent
683 // putfield instructions to the same field would then use cached information.
684 // As a result, those instructions would not pass through the VM. That is,
685 // checks in resolve_field_access() would not be executed for those instructions
686 // and the required IllegalAccessError would not be thrown.
687 //
688 // Also, we need to delay resolving getstatic and putstatic instructions until the
689 // class is initialized. This is required so that access to the static
690 // field will call the initialization function every time until the class
691 // is completely initialized ala. in 2.17.5 in JVM Specification.
692 InstanceKlass* klass = info.field_holder();
693 bool uninitialized_static = is_static && !klass->is_initialized();
694 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
695 info.has_initialized_final_update();
696 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
697
698 Bytecodes::Code get_code = (Bytecodes::Code)0;
699 Bytecodes::Code put_code = (Bytecodes::Code)0;
700 if (!uninitialized_static) {
701 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
702 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
703 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
704 }
705 }
706
707 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
708 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile());
709 entry->fill_in(info.field_holder(), info.offset(),
710 checked_cast<u2>(info.index()), checked_cast<u1>(state),
711 static_cast<u1>(get_code), static_cast<u1>(put_code));
712 }
713
714
715 //------------------------------------------------------------------------------------------------------------------------
716 // Synchronization
717 //
718 // The interpreter's synchronization code is factored out so that it can
719 // be shared by method invocation and synchronized blocks.
720 //%note synchronization_3
721
722 //%note monitor_1
723 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
724 #ifdef ASSERT
725 current->last_frame().interpreter_frame_verify_monitor(elem);
726 #endif
727 Handle h_obj(current, elem->obj());
728 assert(Universe::heap()->is_in_or_null(h_obj()),
729 "must be null or an object");
730 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
731 assert(Universe::heap()->is_in_or_null(elem->obj()),
732 "must be null or an object");
733 #ifdef ASSERT
734 if (!current->preempting()) current->last_frame().interpreter_frame_verify_monitor(elem);
735 #endif
736 JRT_END
737
738 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
739 oop obj = elem->obj();
740 assert(Universe::heap()->is_in(obj), "must be an object");
741 // The object could become unlocked through a JNI call, which we have no other checks for.
742 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
743 if (obj->is_unlocked()) {
744 if (CheckJNICalls) {
745 fatal("Object has been unlocked by JNI");
746 }
747 return;
748 }
749 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
750 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
751 // again at method exit or in the case of an exception.
752 elem->set_obj(nullptr);
753 JRT_END
754
755
756 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
757 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
758 JRT_END
759
760
761 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
762 // Returns an illegal exception to install into the current thread. The
763 // pending_exception flag is cleared so normal exception handling does not
764 // trigger. Any current installed exception will be overwritten. This
765 // method will be called during an exception unwind.
766
767 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
768 Handle exception(current, current->vm_result());
769 assert(exception() != nullptr, "vm result should be set");
770 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
771 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
772 current->set_vm_result(exception());
773 JRT_END
774
775
776 //------------------------------------------------------------------------------------------------------------------------
777 // Invokes
778
779 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
780 return method->orig_bytecode_at(method->bci_from(bcp));
781 JRT_END
782
783 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
784 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
785 JRT_END
786
787 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
788 JvmtiExport::post_raw_breakpoint(current, method, bcp);
789 JRT_END
790
791 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
792 LastFrameAccessor last_frame(current);
793 // extract receiver from the outgoing argument list if necessary
794 Handle receiver(current, nullptr);
795 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
796 bytecode == Bytecodes::_invokespecial) {
797 ResourceMark rm(current);
798 methodHandle m (current, last_frame.method());
799 Bytecode_invoke call(m, last_frame.bci());
800 Symbol* signature = call.signature();
801 receiver = Handle(current, last_frame.callee_receiver(signature));
802
803 assert(Universe::heap()->is_in_or_null(receiver()),
804 "sanity check");
805 assert(receiver.is_null() ||
806 !Universe::heap()->is_in(receiver->klass()),
807 "sanity check");
808 }
809
810 // resolve method
811 CallInfo info;
812 constantPoolHandle pool(current, last_frame.method()->constants());
813
814 methodHandle resolved_method;
815
816 int method_index = last_frame.get_index_u2(bytecode);
817 {
818 JvmtiHideSingleStepping jhss(current);
819 JavaThread* THREAD = current; // For exception macros.
820 LinkResolver::resolve_invoke(info, receiver, pool,
821 method_index, bytecode,
822 THREAD);
823
824 if (HAS_PENDING_EXCEPTION) {
825 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
826 // Preserve the original exception across the call to note_trap()
827 PreserveExceptionMark pm(current);
828 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
829 note_trap(current, Deoptimization::Reason_null_check);
830 }
831 return;
832 }
833
834 resolved_method = methodHandle(current, info.resolved_method());
835 } // end JvmtiHideSingleStepping
836
837 update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
838 }
839
840 void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
841 methodHandle& resolved_method,
842 constantPoolHandle& pool,
843 int method_index) {
844 // Don't allow safepoints until the method is cached.
845 NoSafepointVerifier nsv;
846
847 // check if link resolution caused cpCache to be updated
848 ConstantPoolCache* cache = pool->cache();
849 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
850
851 #ifdef ASSERT
852 if (bytecode == Bytecodes::_invokeinterface) {
853 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
854 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
855 // (see also CallInfo::set_interface for details)
856 assert(info.call_kind() == CallInfo::vtable_call ||
857 info.call_kind() == CallInfo::direct_call, "");
858 assert(resolved_method->is_final() || info.has_vtable_index(),
859 "should have been set already");
860 } else if (!resolved_method->has_itable_index()) {
861 // Resolved something like CharSequence.toString. Use vtable not itable.
862 assert(info.call_kind() != CallInfo::itable_call, "");
863 } else {
864 // Setup itable entry
865 assert(info.call_kind() == CallInfo::itable_call, "");
866 int index = resolved_method->itable_index();
867 assert(info.itable_index() == index, "");
868 }
869 } else if (bytecode == Bytecodes::_invokespecial) {
870 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
871 } else {
872 assert(info.call_kind() == CallInfo::direct_call ||
873 info.call_kind() == CallInfo::vtable_call, "");
874 }
875 #endif
876 // Get sender and only set cpCache entry to resolved if it is not an
877 // interface. The receiver for invokespecial calls within interface
878 // methods must be checked for every call.
879 InstanceKlass* sender = pool->pool_holder();
880
881 switch (info.call_kind()) {
882 case CallInfo::direct_call:
883 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
884 break;
885 case CallInfo::vtable_call:
886 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
887 break;
888 case CallInfo::itable_call:
889 cache->set_itable_call(
890 bytecode,
891 method_index,
892 info.resolved_klass(),
893 resolved_method,
894 info.itable_index());
895 break;
896 default: ShouldNotReachHere();
897 }
898 }
899
900 void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
901 constantPoolHandle& pool, TRAPS) {
902 LinkInfo link_info(pool, method_index, bytecode, CHECK);
903
904 if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
905 CallInfo call_info;
906 switch (bytecode) {
907 case Bytecodes::_invokevirtual: LinkResolver::cds_resolve_virtual_call (call_info, link_info, CHECK); break;
908 case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
909 case Bytecodes::_invokespecial: LinkResolver::cds_resolve_special_call (call_info, link_info, CHECK); break;
910
911 default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
912 }
913 methodHandle resolved_method(THREAD, call_info.resolved_method());
914 guarantee(resolved_method->method_holder()->is_linked(), "");
915 update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
916 } else {
917 // FIXME: why a shared class is not linked yet?
918 // Can't link it here since there are no guarantees it'll be prelinked on the next run.
919 ResourceMark rm;
920 InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
921 log_info(cds, resolve)("Not resolved: class not linked: %s %s %s",
922 resolved_iklass->is_shared() ? "is_shared" : "",
923 resolved_iklass->init_state_name(),
924 resolved_iklass->external_name());
925 }
926 }
927
928 // First time execution: Resolve symbols, create a permanent MethodType object.
929 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
930 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
931 LastFrameAccessor last_frame(current);
932
933 // resolve method
934 CallInfo info;
935 constantPoolHandle pool(current, last_frame.method()->constants());
936 int method_index = last_frame.get_index_u2(bytecode);
937 {
938 JvmtiHideSingleStepping jhss(current);
939 JavaThread* THREAD = current; // For exception macros.
940 LinkResolver::resolve_invoke(info, Handle(), pool,
941 method_index, bytecode,
942 CHECK);
943 } // end JvmtiHideSingleStepping
944
945 pool->cache()->set_method_handle(method_index, info);
946 }
947
948 void InterpreterRuntime::cds_resolve_invokehandle(int raw_index,
949 constantPoolHandle& pool, TRAPS) {
950 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
951 CallInfo info;
952 LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
953
954 pool->cache()->set_method_handle(raw_index, info);
955 }
956
957 // First time execution: Resolve symbols, create a permanent CallSite object.
958 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
959 LastFrameAccessor last_frame(current);
960 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
961
962 // resolve method
963 CallInfo info;
964 constantPoolHandle pool(current, last_frame.method()->constants());
965 int index = last_frame.get_index_u4(bytecode);
966 {
967 JvmtiHideSingleStepping jhss(current);
968 JavaThread* THREAD = current; // For exception macros.
969 LinkResolver::resolve_invoke(info, Handle(), pool,
970 index, bytecode, CHECK);
971 } // end JvmtiHideSingleStepping
972
973 pool->cache()->set_dynamic_call(info, index);
974 }
975
976 void InterpreterRuntime::cds_resolve_invokedynamic(int raw_index,
977 constantPoolHandle& pool, TRAPS) {
978 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
979 CallInfo info;
980 LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
981 pool->cache()->set_dynamic_call(info, raw_index);
982 }
983
984 // This function is the interface to the assembly code. It returns the resolved
985 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
986 // This function will check for redefinition!
987 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
988 switch (bytecode) {
989 case Bytecodes::_getstatic:
990 case Bytecodes::_putstatic:
991 case Bytecodes::_getfield:
992 case Bytecodes::_putfield:
993 resolve_get_put(current, bytecode);
994 break;
995 case Bytecodes::_invokevirtual:
996 case Bytecodes::_invokespecial:
997 case Bytecodes::_invokestatic:
998 case Bytecodes::_invokeinterface:
999 resolve_invoke(current, bytecode);
1000 break;
1001 case Bytecodes::_invokehandle:
1002 resolve_invokehandle(current);
1003 break;
1004 case Bytecodes::_invokedynamic:
1005 resolve_invokedynamic(current);
1006 break;
1007 default:
1008 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1009 break;
1010 }
1011 }
1012 JRT_END
1013
1014 //------------------------------------------------------------------------------------------------------------------------
1015 // Miscellaneous
1016
1017
1018 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1019 // Enable WXWrite: the function is called directly by interpreter.
1020 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1021
1022 // frequency_counter_overflow_inner can throw async exception.
1023 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1024 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1025 if (branch_bcp != nullptr && nm != nullptr) {
1026 // This was a successful request for an OSR nmethod. Because
1027 // frequency_counter_overflow_inner ends with a safepoint check,
1028 // nm could have been unloaded so look it up again. It's unsafe
1029 // to examine nm directly since it might have been freed and used
1030 // for something else.
1031 LastFrameAccessor last_frame(current);
1032 Method* method = last_frame.method();
1033 int bci = method->bci_from(last_frame.bcp());
1034 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1035 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1036 if (nm != nullptr && bs_nm != nullptr) {
1037 // in case the transition passed a safepoint we need to barrier this again
1038 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1039 nm = nullptr;
1040 }
1041 }
1042 }
1043 if (nm != nullptr && current->is_interp_only_mode()) {
1044 // Normally we never get an nm if is_interp_only_mode() is true, because
1045 // policy()->event has a check for this and won't compile the method when
1046 // true. However, it's possible for is_interp_only_mode() to become true
1047 // during the compilation. We don't want to return the nm in that case
1048 // because we want to continue to execute interpreted.
1049 nm = nullptr;
1050 }
1051 #ifndef PRODUCT
1052 if (TraceOnStackReplacement) {
1053 if (nm != nullptr) {
1054 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1055 nm->print();
1056 }
1057 }
1058 #endif
1059 return nm;
1060 }
1061
1062 JRT_ENTRY(nmethod*,
1063 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1064 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1065 // flag, in case this method triggers classloading which will call into Java.
1066 UnlockFlagSaver fs(current);
1067
1068 LastFrameAccessor last_frame(current);
1069 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1070 methodHandle method(current, last_frame.method());
1071 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1072 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1073
1074 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1075
1076 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1077 if (osr_nm != nullptr && bs_nm != nullptr) {
1078 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1079 osr_nm = nullptr;
1080 }
1081 }
1082 return osr_nm;
1083 JRT_END
1084
1085 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1086 assert(ProfileInterpreter, "must be profiling interpreter");
1087 int bci = method->bci_from(cur_bcp);
1088 MethodData* mdo = method->method_data();
1089 if (mdo == nullptr) return 0;
1090 return mdo->bci_to_di(bci);
1091 JRT_END
1092
1093 #ifdef ASSERT
1094 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1095 assert(ProfileInterpreter, "must be profiling interpreter");
1096
1097 MethodData* mdo = method->method_data();
1098 assert(mdo != nullptr, "must not be null");
1099
1100 int bci = method->bci_from(bcp);
1101
1102 address mdp2 = mdo->bci_to_dp(bci);
1103 if (mdp != mdp2) {
1104 ResourceMark rm;
1105 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1106 int current_di = mdo->dp_to_di(mdp);
1107 int expected_di = mdo->dp_to_di(mdp2);
1108 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1109 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1110 int approx_bci = -1;
1111 if (current_di >= 0) {
1112 approx_bci = mdo->data_at(current_di)->bci();
1113 }
1114 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1115 mdo->print_on(tty);
1116 method->print_codes();
1117 }
1118 assert(mdp == mdp2, "wrong mdp");
1119 JRT_END
1120 #endif // ASSERT
1121
1122 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1123 assert(ProfileInterpreter, "must be profiling interpreter");
1124 ResourceMark rm(current);
1125 LastFrameAccessor last_frame(current);
1126 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1127 MethodData* h_mdo = last_frame.method()->method_data();
1128
1129 // Grab a lock to ensure atomic access to setting the return bci and
1130 // the displacement. This can block and GC, invalidating all naked oops.
1131 MutexLocker ml(RetData_lock);
1132
1133 // ProfileData is essentially a wrapper around a derived oop, so we
1134 // need to take the lock before making any ProfileData structures.
1135 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1136 guarantee(data != nullptr, "profile data must be valid");
1137 RetData* rdata = data->as_RetData();
1138 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1139 last_frame.set_mdp(new_mdp);
1140 JRT_END
1141
1142 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1143 return Method::build_method_counters(current, m);
1144 JRT_END
1145
1146
1147 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1148 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1149 // stack traversal automatically takes care of preserving arguments for invoke, so
1150 // this is no longer needed.
1151
1152 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1153 // if this is called during a safepoint
1154
1155 if (JvmtiExport::should_post_single_step()) {
1156 // This function is called by the interpreter when single stepping. Such single
1157 // stepping could unwind a frame. Then, it is important that we process any frames
1158 // that we might return into.
1159 StackWatermarkSet::before_unwind(current);
1160
1161 // We are called during regular safepoints and when the VM is
1162 // single stepping. If any thread is marked for single stepping,
1163 // then we may have JVMTI work to do.
1164 LastFrameAccessor last_frame(current);
1165 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1166 }
1167 JRT_END
1168
1169 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1170 assert(current == JavaThread::current(), "pre-condition");
1171 // This function is called by the interpreter when the return poll found a reason
1172 // to call the VM. The reason could be that we are returning into a not yet safe
1173 // to access frame. We handle that below.
1174 // Note that this path does not check for single stepping, because we do not want
1175 // to single step when unwinding frames for an exception being thrown. Instead,
1176 // such single stepping code will use the safepoint table, which will use the
1177 // InterpreterRuntime::at_safepoint callback.
1178 StackWatermarkSet::before_unwind(current);
1179 JRT_END
1180
1181 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1182 ResolvedFieldEntry *entry))
1183
1184 // check the access_flags for the field in the klass
1185
1186 InstanceKlass* ik = entry->field_holder();
1187 int index = entry->field_index();
1188 if (!ik->field_status(index).is_access_watched()) return;
1189
1190 bool is_static = (obj == nullptr);
1191 HandleMark hm(current);
1192
1193 Handle h_obj;
1194 if (!is_static) {
1195 // non-static field accessors have an object, but we need a handle
1196 h_obj = Handle(current, obj);
1197 }
1198 InstanceKlass* field_holder = entry->field_holder(); // HERE
1199 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static);
1200 LastFrameAccessor last_frame(current);
1201 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1202 JRT_END
1203
1204 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1205 ResolvedFieldEntry *entry, jvalue *value))
1206
1207 InstanceKlass* ik = entry->field_holder();
1208
1209 // check the access_flags for the field in the klass
1210 int index = entry->field_index();
1211 // bail out if field modifications are not watched
1212 if (!ik->field_status(index).is_modification_watched()) return;
1213
1214 char sig_type = '\0';
1215
1216 switch((TosState)entry->tos_state()) {
1217 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1218 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1219 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1220 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1221 case itos: sig_type = JVM_SIGNATURE_INT; break;
1222 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1223 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1224 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1225 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1226 default: ShouldNotReachHere(); return;
1227 }
1228 bool is_static = (obj == nullptr);
1229
1230 HandleMark hm(current);
1231 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static);
1232 jvalue fvalue;
1233 #ifdef _LP64
1234 fvalue = *value;
1235 #else
1236 // Long/double values are stored unaligned and also noncontiguously with
1237 // tagged stacks. We can't just do a simple assignment even in the non-
1238 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1239 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1240 // We assume that the two halves of longs/doubles are stored in interpreter
1241 // stack slots in platform-endian order.
1242 jlong_accessor u;
1243 jint* newval = (jint*)value;
1244 u.words[0] = newval[0];
1245 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1246 fvalue.j = u.long_value;
1247 #endif // _LP64
1248
1249 Handle h_obj;
1250 if (!is_static) {
1251 // non-static field accessors have an object, but we need a handle
1252 h_obj = Handle(current, obj);
1253 }
1254
1255 LastFrameAccessor last_frame(current);
1256 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1257 fid, sig_type, &fvalue);
1258 JRT_END
1259
1260 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1261 LastFrameAccessor last_frame(current);
1262 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1263 JRT_END
1264
1265
1266 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1267 // before transitioning to VM, and restore it after transitioning back
1268 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1269 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1270 LastFrameAccessor last_frame(current);
1271 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1272 JRT_END
1273
1274 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1275 {
1276 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1277 }
1278 JRT_END
1279
1280
1281 // Implementation of SignatureHandlerLibrary
1282
1283 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1284 // Dummy definition (else normalization method is defined in CPU
1285 // dependent code)
1286 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1287 return fingerprint;
1288 }
1289 #endif
1290
1291 address SignatureHandlerLibrary::set_handler_blob() {
1292 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1293 if (handler_blob == nullptr) {
1294 return nullptr;
1295 }
1296 address handler = handler_blob->code_begin();
1297 _handler_blob = handler_blob;
1298 _handler = handler;
1299 return handler;
1300 }
1301
1302 void SignatureHandlerLibrary::initialize() {
1303 if (_fingerprints != nullptr) {
1304 return;
1305 }
1306 if (set_handler_blob() == nullptr) {
1307 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1308 }
1309
1310 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1311 SignatureHandlerLibrary::buffer_size);
1312 _buffer = bb->code_begin();
1313
1314 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1315 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1316 }
1317
1318 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1319 address handler = _handler;
1320 int insts_size = buffer->pure_insts_size();
1321 if (handler + insts_size > _handler_blob->code_end()) {
1322 // get a new handler blob
1323 handler = set_handler_blob();
1324 }
1325 if (handler != nullptr) {
1326 memcpy(handler, buffer->insts_begin(), insts_size);
1327 pd_set_handler(handler);
1328 ICache::invalidate_range(handler, insts_size);
1329 _handler = handler + insts_size;
1330 }
1331 return handler;
1332 }
1333
1334 void SignatureHandlerLibrary::add(const methodHandle& method) {
1335 if (method->signature_handler() == nullptr) {
1336 // use slow signature handler if we can't do better
1337 int handler_index = -1;
1338 // check if we can use customized (fast) signature handler
1339 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1340 // use customized signature handler
1341 MutexLocker mu(SignatureHandlerLibrary_lock);
1342 // make sure data structure is initialized
1343 initialize();
1344 // lookup method signature's fingerprint
1345 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1346 // allow CPU dependent code to optimize the fingerprints for the fast handler
1347 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1348 handler_index = _fingerprints->find(fingerprint);
1349 // create handler if necessary
1350 if (handler_index < 0) {
1351 ResourceMark rm;
1352 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1353 CodeBuffer buffer((address)(_buffer + align_offset),
1354 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1355 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1356 // copy into code heap
1357 address handler = set_handler(&buffer);
1358 if (handler == nullptr) {
1359 // use slow signature handler (without memorizing it in the fingerprints)
1360 } else {
1361 // debugging support
1362 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1363 ttyLocker ttyl;
1364 tty->cr();
1365 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1366 _handlers->length(),
1367 (method->is_static() ? "static" : "receiver"),
1368 method->name_and_sig_as_C_string(),
1369 fingerprint,
1370 buffer.insts_size());
1371 if (buffer.insts_size() > 0) {
1372 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1373 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1374 }
1375 #ifndef PRODUCT
1376 address rh_begin = Interpreter::result_handler(method()->result_type());
1377 if (CodeCache::contains(rh_begin)) {
1378 // else it might be special platform dependent values
1379 tty->print_cr(" --- associated result handler ---");
1380 address rh_end = rh_begin;
1381 while (*(int*)rh_end != 0) {
1382 rh_end += sizeof(int);
1383 }
1384 Disassembler::decode(rh_begin, rh_end);
1385 } else {
1386 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1387 }
1388 #endif
1389 }
1390 // add handler to library
1391 _fingerprints->append(fingerprint);
1392 _handlers->append(handler);
1393 // set handler index
1394 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1395 handler_index = _fingerprints->length() - 1;
1396 }
1397 }
1398 // Set handler under SignatureHandlerLibrary_lock
1399 if (handler_index < 0) {
1400 // use generic signature handler
1401 method->set_signature_handler(Interpreter::slow_signature_handler());
1402 } else {
1403 // set handler
1404 method->set_signature_handler(_handlers->at(handler_index));
1405 }
1406 } else {
1407 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1408 // use generic signature handler
1409 method->set_signature_handler(Interpreter::slow_signature_handler());
1410 }
1411 }
1412 #ifdef ASSERT
1413 int handler_index = -1;
1414 int fingerprint_index = -2;
1415 {
1416 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1417 // in any way if accessed from multiple threads. To avoid races with another
1418 // thread which may change the arrays in the above, mutex protected block, we
1419 // have to protect this read access here with the same mutex as well!
1420 MutexLocker mu(SignatureHandlerLibrary_lock);
1421 if (_handlers != nullptr) {
1422 handler_index = _handlers->find(method->signature_handler());
1423 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1424 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1425 fingerprint_index = _fingerprints->find(fingerprint);
1426 }
1427 }
1428 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1429 handler_index == fingerprint_index, "sanity check");
1430 #endif // ASSERT
1431 }
1432
1433 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1434 address SignatureHandlerLibrary::_handler = nullptr;
1435 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1436 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1437 address SignatureHandlerLibrary::_buffer = nullptr;
1438
1439
1440 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1441 methodHandle m(current, method);
1442 assert(m->is_native(), "sanity check");
1443 // lookup native function entry point if it doesn't exist
1444 if (!m->has_native_function()) {
1445 NativeLookup::lookup(m, CHECK);
1446 }
1447 // make sure signature handler is installed
1448 SignatureHandlerLibrary::add(m);
1449 // The interpreter entry point checks the signature handler first,
1450 // before trying to fetch the native entry point and klass mirror.
1451 // We must set the signature handler last, so that multiple processors
1452 // preparing the same method will be sure to see non-null entry & mirror.
1453 JRT_END
1454
1455 #if defined(IA32) || defined(AMD64) || defined(ARM)
1456 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1457 assert(current == JavaThread::current(), "pre-condition");
1458 if (src_address == dest_address) {
1459 return;
1460 }
1461 ResourceMark rm;
1462 LastFrameAccessor last_frame(current);
1463 assert(last_frame.is_interpreted_frame(), "");
1464 jint bci = last_frame.bci();
1465 methodHandle mh(current, last_frame.method());
1466 Bytecode_invoke invoke(mh, bci);
1467 ArgumentSizeComputer asc(invoke.signature());
1468 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1469 Copy::conjoint_jbytes(src_address, dest_address,
1470 size_of_arguments * Interpreter::stackElementSize);
1471 JRT_END
1472 #endif
1473
1474 #if INCLUDE_JVMTI
1475 // This is a support of the JVMTI PopFrame interface.
1476 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1477 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1478 // The member_name argument is a saved reference (in local#0) to the member_name.
1479 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1480 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1481 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1482 Method* method, address bcp))
1483 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1484 if (code != Bytecodes::_invokestatic) {
1485 return;
1486 }
1487 ConstantPool* cpool = method->constants();
1488 int cp_index = Bytes::get_native_u2(bcp + 1);
1489 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1490 Symbol* mname = cpool->name_ref_at(cp_index, code);
1491
1492 if (MethodHandles::has_member_arg(cname, mname)) {
1493 oop member_name_oop = cast_to_oop(member_name);
1494 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1495 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1496 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1497 }
1498 current->set_vm_result(member_name_oop);
1499 } else {
1500 current->set_vm_result(nullptr);
1501 }
1502 JRT_END
1503 #endif // INCLUDE_JVMTI
1504
1505 #ifndef PRODUCT
1506 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1507 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1508 // The generated code still uses call_VM because that will set up the frame pointer for
1509 // bcp and method.
1510 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1511 assert(current == JavaThread::current(), "pre-condition");
1512 LastFrameAccessor last_frame(current);
1513 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1514 methodHandle mh(current, last_frame.method());
1515 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1516 return preserve_this_value;
1517 JRT_END
1518 #endif // !PRODUCT