1 /*
2 * Copyright (c) 1997, 2024, 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 "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "compiler/compilationPolicy.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "gc/shared/barrierSetNMethod.hpp"
35 #include "gc/shared/collectedHeap.hpp"
36 #include "interpreter/bytecodeTracer.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "interpreter/interpreterRuntime.hpp"
39 #include "interpreter/linkResolver.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/methodData.hpp"
51 #include "oops/method.inline.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/atomic.hpp"
60 #include "runtime/continuation.hpp"
61 #include "runtime/deoptimization.hpp"
62 #include "runtime/fieldDescriptor.inline.hpp"
63 #include "runtime/frame.inline.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/icache.hpp"
66 #include "runtime/interfaceSupport.inline.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/jfieldIDWorkaround.hpp"
70 #include "runtime/osThread.hpp"
71 #include "runtime/sharedRuntime.hpp"
72 #include "runtime/stackWatermarkSet.hpp"
73 #include "runtime/stubRoutines.hpp"
74 #include "runtime/synchronizer.hpp"
75 #include "runtime/threadCritical.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/checkedCast.hpp"
78 #include "utilities/copy.hpp"
79 #include "utilities/events.hpp"
80 #ifdef COMPILER2
81 #include "opto/runtime.hpp"
82 #endif
83
84 // Helper class to access current interpreter state
85 class LastFrameAccessor : public StackObj {
86 frame _last_frame;
87 public:
88 LastFrameAccessor(JavaThread* current) {
89 assert(current == Thread::current(), "sanity");
90 _last_frame = current->last_frame();
91 }
92 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
93 Method* method() const { return _last_frame.interpreter_frame_method(); }
94 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
95 int bci() const { return _last_frame.interpreter_frame_bci(); }
96 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
97
98 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
99 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
100
101 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
102 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
103
104 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
105 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
106 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
107 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
108 int number_of_dimensions() const { return bcp()[3]; }
109
110 oop callee_receiver(Symbol* signature) {
111 return _last_frame.interpreter_callee_receiver(signature);
112 }
113 BasicObjectLock* monitor_begin() const {
114 return _last_frame.interpreter_frame_monitor_begin();
115 }
116 BasicObjectLock* monitor_end() const {
117 return _last_frame.interpreter_frame_monitor_end();
118 }
119 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
120 return _last_frame.next_monitor_in_interpreter_frame(current);
121 }
122
123 frame& get_frame() { return _last_frame; }
124 };
125
126 //------------------------------------------------------------------------------------------------------------------------
127 // State accessors
128
129 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
130 LastFrameAccessor last_frame(current);
131 last_frame.set_bcp(bcp);
132 if (ProfileInterpreter) {
133 // ProfileTraps uses MDOs independently of ProfileInterpreter.
134 // That is why we must check both ProfileInterpreter and mdo != nullptr.
135 MethodData* mdo = last_frame.method()->method_data();
136 if (mdo != nullptr) {
137 NEEDS_CLEANUP;
138 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
139 }
140 }
141 }
142
143 //------------------------------------------------------------------------------------------------------------------------
144 // Constants
145
146
147 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
148 // access constant pool
149 LastFrameAccessor last_frame(current);
150 ConstantPool* pool = last_frame.method()->constants();
151 int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
152 constantTag tag = pool->tag_at(cp_index);
153
154 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
155 Klass* klass = pool->klass_at(cp_index, CHECK);
156 oop java_class = klass->java_mirror();
157 current->set_vm_result(java_class);
158 JRT_END
159
160 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
161 assert(bytecode == Bytecodes::_ldc ||
162 bytecode == Bytecodes::_ldc_w ||
163 bytecode == Bytecodes::_ldc2_w ||
164 bytecode == Bytecodes::_fast_aldc ||
165 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
166 ResourceMark rm(current);
167 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
168 bytecode == Bytecodes::_fast_aldc_w);
169 LastFrameAccessor last_frame(current);
170 methodHandle m (current, last_frame.method());
171 Bytecode_loadconstant ldc(m, last_frame.bci());
172
173 // Double-check the size. (Condy can have any type.)
174 BasicType type = ldc.result_type();
175 switch (type2size[type]) {
176 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
177 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
178 default: ShouldNotReachHere();
179 }
180
181 // Resolve the constant. This does not do unboxing.
182 // But it does replace Universe::the_null_sentinel by null.
183 oop result = ldc.resolve_constant(CHECK);
184 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
185
186 #ifdef ASSERT
187 {
188 // The bytecode wrappers aren't GC-safe so construct a new one
189 Bytecode_loadconstant ldc2(m, last_frame.bci());
190 int rindex = ldc2.cache_index();
191 if (rindex < 0)
192 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
193 if (rindex >= 0) {
194 oop coop = m->constants()->resolved_reference_at(rindex);
195 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
196 assert(roop == coop, "expected result for assembly code");
197 }
198 }
199 #endif
200 current->set_vm_result(result);
201 if (!is_fast_aldc) {
202 // Tell the interpreter how to unbox the primitive.
203 guarantee(java_lang_boxing_object::is_instance(result, type), "");
204 int offset = java_lang_boxing_object::value_offset(type);
205 intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift)
206 | (offset & ConstantPoolCache::field_index_mask));
207 current->set_vm_result_2((Metadata*)flags);
208 }
209 }
210 JRT_END
211
212
213 //------------------------------------------------------------------------------------------------------------------------
214 // Allocation
215
216 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
217 Klass* k = pool->klass_at(index, CHECK);
218 InstanceKlass* klass = InstanceKlass::cast(k);
219
220 // Make sure we are not instantiating an abstract klass
221 klass->check_valid_for_instantiation(true, CHECK);
222
223 // Make sure klass is initialized
224 klass->initialize(CHECK);
225
226 // At this point the class may not be fully initialized
227 // because of recursive initialization. If it is fully
228 // initialized & has_finalized is not set, we rewrite
229 // it into its fast version (Note: no locking is needed
230 // here since this is an atomic byte write and can be
231 // done more than once).
232 //
233 // Note: In case of classes with has_finalized we don't
234 // rewrite since that saves us an extra check in
235 // the fast version which then would call the
236 // slow version anyway (and do a call back into
237 // Java).
238 // If we have a breakpoint, then we don't rewrite
239 // because the _breakpoint bytecode would be lost.
240 oop obj = klass->allocate_instance(CHECK);
241 current->set_vm_result(obj);
242 JRT_END
243
244
245 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
246 oop obj = oopFactory::new_typeArray(type, size, CHECK);
247 current->set_vm_result(obj);
248 JRT_END
249
250
251 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
252 Klass* klass = pool->klass_at(index, CHECK);
253 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
254 current->set_vm_result(obj);
255 JRT_END
256
257
258 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
259 // We may want to pass in more arguments - could make this slightly faster
260 LastFrameAccessor last_frame(current);
261 ConstantPool* constants = last_frame.method()->constants();
262 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
263 Klass* klass = constants->klass_at(i, CHECK);
264 int nof_dims = last_frame.number_of_dimensions();
265 assert(klass->is_klass(), "not a class");
266 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
267
268 // We must create an array of jints to pass to multi_allocate.
269 ResourceMark rm(current);
270 const int small_dims = 10;
271 jint dim_array[small_dims];
272 jint *dims = &dim_array[0];
273 if (nof_dims > small_dims) {
274 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
275 }
276 for (int index = 0; index < nof_dims; index++) {
277 // offset from first_size_address is addressed as local[index]
278 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
279 dims[index] = first_size_address[n];
280 }
281 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
282 current->set_vm_result(obj);
283 JRT_END
284
285
286 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
287 assert(oopDesc::is_oop(obj), "must be a valid oop");
288 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
289 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
290 JRT_END
291
292
293 // Quicken instance-of and check-cast bytecodes
294 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
295 // Force resolving; quicken the bytecode
296 LastFrameAccessor last_frame(current);
297 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
298 ConstantPool* cpool = last_frame.method()->constants();
299 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
300 // program we might have seen an unquick'd bytecode in the interpreter but have another
301 // thread quicken the bytecode before we get here.
302 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
303 Klass* klass = cpool->klass_at(which, CHECK);
304 current->set_vm_result_2(klass);
305 JRT_END
306
307
308 //------------------------------------------------------------------------------------------------------------------------
309 // Exceptions
310
311 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
312 const methodHandle& trap_method, int trap_bci) {
313 if (trap_method.not_null()) {
314 MethodData* trap_mdo = trap_method->method_data();
315 if (trap_mdo == nullptr) {
316 ExceptionMark em(current);
317 JavaThread* THREAD = current; // For exception macros.
318 Method::build_profiling_method_data(trap_method, THREAD);
319 if (HAS_PENDING_EXCEPTION) {
320 // Only metaspace OOM is expected. No Java code executed.
321 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
322 "we expect only an OOM error here");
323 CLEAR_PENDING_EXCEPTION;
324 }
325 trap_mdo = trap_method->method_data();
326 // and fall through...
327 }
328 if (trap_mdo != nullptr) {
329 // Update per-method count of trap events. The interpreter
330 // is updating the MDO to simulate the effect of compiler traps.
331 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
332 }
333 }
334 }
335
336 // Assume the compiler is (or will be) interested in this event.
337 // If necessary, create an MDO to hold the information, and record it.
338 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
339 assert(ProfileTraps, "call me only if profiling");
340 LastFrameAccessor last_frame(current);
341 methodHandle trap_method(current, last_frame.method());
342 int trap_bci = trap_method->bci_from(last_frame.bcp());
343 note_trap_inner(current, reason, trap_method, trap_bci);
344 }
345
346 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
347 // get klass
348 InstanceKlass* klass = InstanceKlass::cast(k);
349 assert(klass->is_initialized(),
350 "this klass should have been initialized during VM initialization");
351 // create instance - do not call constructor since we may have no
352 // (java) stack space left (should assert constructor is empty)
353 Handle exception;
354 oop exception_oop = klass->allocate_instance(CHECK_(exception));
355 exception = Handle(THREAD, exception_oop);
356 if (StackTraceInThrowable) {
357 java_lang_Throwable::fill_in_stack_trace(exception);
358 }
359 return exception;
360 }
361
362 // Special handling for stack overflow: since we don't have any (java) stack
363 // space left we use the pre-allocated & pre-initialized StackOverflowError
364 // klass to create an stack overflow error instance. We do not call its
365 // constructor for the same reason (it is empty, anyway).
366 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
367 Handle exception = get_preinitialized_exception(
368 vmClasses::StackOverflowError_klass(),
369 CHECK);
370 // Increment counter for hs_err file reporting
371 Atomic::inc(&Exceptions::_stack_overflow_errors);
372 // Remove the ScopedValue bindings in case we got a StackOverflowError
373 // while we were trying to manipulate ScopedValue bindings.
374 current->clear_scopedValueBindings();
375 THROW_HANDLE(exception);
376 JRT_END
377
378 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
379 Handle exception = get_preinitialized_exception(
380 vmClasses::StackOverflowError_klass(),
381 CHECK);
382 java_lang_Throwable::set_message(exception(),
383 Universe::delayed_stack_overflow_error_message());
384 // Increment counter for hs_err file reporting
385 Atomic::inc(&Exceptions::_stack_overflow_errors);
386 // Remove the ScopedValue bindings in case we got a StackOverflowError
387 // while we were trying to manipulate ScopedValue bindings.
388 current->clear_scopedValueBindings();
389 THROW_HANDLE(exception);
390 JRT_END
391
392 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
393 // lookup exception klass
394 TempNewSymbol s = SymbolTable::new_symbol(name);
395 if (ProfileTraps) {
396 if (s == vmSymbols::java_lang_ArithmeticException()) {
397 note_trap(current, Deoptimization::Reason_div0_check);
398 } else if (s == vmSymbols::java_lang_NullPointerException()) {
399 note_trap(current, Deoptimization::Reason_null_check);
400 }
401 }
402 // create exception
403 Handle exception = Exceptions::new_exception(current, s, message);
404 current->set_vm_result(exception());
405 JRT_END
406
407
408 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
409 // Produce the error message first because note_trap can safepoint
410 ResourceMark rm(current);
411 const char* klass_name = obj->klass()->external_name();
412 // lookup exception klass
413 TempNewSymbol s = SymbolTable::new_symbol(name);
414 if (ProfileTraps) {
415 if (s == vmSymbols::java_lang_ArrayStoreException()) {
416 note_trap(current, Deoptimization::Reason_array_check);
417 } else {
418 note_trap(current, Deoptimization::Reason_class_check);
419 }
420 }
421 // create exception, with klass name as detail message
422 Handle exception = Exceptions::new_exception(current, s, klass_name);
423 current->set_vm_result(exception());
424 JRT_END
425
426 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
427 // Produce the error message first because note_trap can safepoint
428 ResourceMark rm(current);
429 stringStream ss;
430 ss.print("Index %d out of bounds for length %d", index, a->length());
431
432 if (ProfileTraps) {
433 note_trap(current, Deoptimization::Reason_range_check);
434 }
435
436 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
437 JRT_END
438
439 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
440 JavaThread* current, oopDesc* obj))
441
442 // Produce the error message first because note_trap can safepoint
443 ResourceMark rm(current);
444 char* message = SharedRuntime::generate_class_cast_message(
445 current, obj->klass());
446
447 if (ProfileTraps) {
448 note_trap(current, Deoptimization::Reason_class_check);
449 }
450
451 // create exception
452 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
453 JRT_END
454
455 // exception_handler_for_exception(...) returns the continuation address,
456 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
457 // The exception oop is returned to make sure it is preserved over GC (it
458 // is only on the stack if the exception was thrown explicitly via athrow).
459 // During this operation, the expression stack contains the values for the
460 // bci where the exception happened. If the exception was propagated back
461 // from a call, the expression stack contains the values for the bci at the
462 // invoke w/o arguments (i.e., as if one were inside the call).
463 // Note that the implementation of this method assumes it's only called when an exception has actually occured
464 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
465 // We get here after we have unwound from a callee throwing an exception
466 // into the interpreter. Any deferred stack processing is notified of
467 // the event via the StackWatermarkSet.
468 StackWatermarkSet::after_unwind(current);
469
470 LastFrameAccessor last_frame(current);
471 Handle h_exception(current, exception);
472 methodHandle h_method (current, last_frame.method());
473 constantPoolHandle h_constants(current, h_method->constants());
474 bool should_repeat;
475 int handler_bci;
476 int current_bci = last_frame.bci();
477
478 if (current->frames_to_pop_failed_realloc() > 0) {
479 // Allocation of scalar replaced object used in this frame
480 // failed. Unconditionally pop the frame.
481 current->dec_frames_to_pop_failed_realloc();
482 current->set_vm_result(h_exception());
483 // If the method is synchronized we already unlocked the monitor
484 // during deoptimization so the interpreter needs to skip it when
485 // the frame is popped.
486 current->set_do_not_unlock_if_synchronized(true);
487 return Interpreter::remove_activation_entry();
488 }
489
490 // Need to do this check first since when _do_not_unlock_if_synchronized
491 // is set, we don't want to trigger any classloading which may make calls
492 // into java, or surprisingly find a matching exception handler for bci 0
493 // since at this moment the method hasn't been "officially" entered yet.
494 if (current->do_not_unlock_if_synchronized()) {
495 ResourceMark rm;
496 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
497 current->set_vm_result(exception);
498 return Interpreter::remove_activation_entry();
499 }
500
501 do {
502 should_repeat = false;
503
504 // assertions
505 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
506 // Check that exception is a subclass of Throwable.
507 assert(h_exception->is_a(vmClasses::Throwable_klass()),
508 "Exception not subclass of Throwable");
509
510 // tracing
511 if (log_is_enabled(Info, exceptions)) {
512 ResourceMark rm(current);
513 stringStream tempst;
514 tempst.print("interpreter method <%s>\n"
515 " at bci %d for thread " INTPTR_FORMAT " (%s)",
516 h_method->print_value_string(), current_bci, p2i(current), current->name());
517 Exceptions::log_exception(h_exception, tempst.as_string());
518 }
519 // Don't go paging in something which won't be used.
520 // else if (extable->length() == 0) {
521 // // disabled for now - interpreter is not using shortcut yet
522 // // (shortcut is not to call runtime if we have no exception handlers)
523 // // warning("performance bug: should not call runtime if method has no exception handlers");
524 // }
525 // for AbortVMOnException flag
526 Exceptions::debug_check_abort(h_exception);
527
528 // exception handler lookup
529 Klass* klass = h_exception->klass();
530 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
531 if (HAS_PENDING_EXCEPTION) {
532 // We threw an exception while trying to find the exception handler.
533 // Transfer the new exception to the exception handle which will
534 // be set into thread local storage, and do another lookup for an
535 // exception handler for this exception, this time starting at the
536 // BCI of the exception handler which caused the exception to be
537 // thrown (bug 4307310).
538 h_exception = Handle(THREAD, PENDING_EXCEPTION);
539 CLEAR_PENDING_EXCEPTION;
540 if (handler_bci >= 0) {
541 current_bci = handler_bci;
542 should_repeat = true;
543 }
544 }
545 } while (should_repeat == true);
546
547 #if INCLUDE_JVMCI
548 if (EnableJVMCI && h_method->method_data() != nullptr) {
549 ResourceMark rm(current);
550 MethodData* mdo = h_method->method_data();
551
552 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
553 MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
554
555 ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
556 if (pdata != nullptr && pdata->is_BitData()) {
557 BitData* bit_data = (BitData*) pdata;
558 bit_data->set_exception_seen();
559 }
560 }
561 #endif
562
563 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
564 // time throw or a stack unwinding throw and accordingly notify the debugger
565 if (JvmtiExport::can_post_on_exceptions()) {
566 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
567 }
568
569 address continuation = nullptr;
570 address handler_pc = nullptr;
571 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
572 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
573 // handler in this method, or (b) after a stack overflow there is not yet
574 // enough stack space available to reprotect the stack.
575 continuation = Interpreter::remove_activation_entry();
576 #if COMPILER2_OR_JVMCI
577 // Count this for compilation purposes
578 h_method->interpreter_throwout_increment(THREAD);
579 #endif
580 } else {
581 // handler in this method => change bci/bcp to handler bci/bcp and continue there
582 handler_pc = h_method->code_base() + handler_bci;
583 h_method->set_exception_handler_entered(handler_bci); // profiling
584 #ifndef ZERO
585 set_bcp_and_mdp(handler_pc, current);
586 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
587 #else
588 continuation = (address)(intptr_t) handler_bci;
589 #endif
590 }
591
592 // notify debugger of an exception catch
593 // (this is good for exceptions caught in native methods as well)
594 if (JvmtiExport::can_post_on_exceptions()) {
595 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
596 }
597
598 current->set_vm_result(h_exception());
599 return continuation;
600 JRT_END
601
602
603 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
604 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
605 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
606 JRT_END
607
608
609 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
610 THROW(vmSymbols::java_lang_AbstractMethodError());
611 JRT_END
612
613 // This method is called from the "abstract_entry" of the interpreter.
614 // At that point, the arguments have already been removed from the stack
615 // and therefore we don't have the receiver object at our fingertips. (Though,
616 // on some platforms the receiver still resides in a register...). Thus,
617 // we have no choice but print an error message not containing the receiver
618 // type.
619 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
620 Method* missingMethod))
621 ResourceMark rm(current);
622 assert(missingMethod != nullptr, "sanity");
623 methodHandle m(current, missingMethod);
624 LinkResolver::throw_abstract_method_error(m, THREAD);
625 JRT_END
626
627 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
628 Klass* recvKlass,
629 Method* missingMethod))
630 ResourceMark rm(current);
631 methodHandle mh = methodHandle(current, missingMethod);
632 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
633 JRT_END
634
635
636 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
637 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
638 JRT_END
639
640 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
641 Klass* recvKlass,
642 Klass* interfaceKlass))
643 ResourceMark rm(current);
644 char buf[1000];
645 buf[0] = '\0';
646 jio_snprintf(buf, sizeof(buf),
647 "Class %s does not implement the requested interface %s",
648 recvKlass ? recvKlass->external_name() : "nullptr",
649 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
650 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
651 JRT_END
652
653 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
654 THROW(vmSymbols::java_lang_NullPointerException());
655 JRT_END
656
657 //------------------------------------------------------------------------------------------------------------------------
658 // Fields
659 //
660
661 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
662 // resolve field
663 fieldDescriptor info;
664 LastFrameAccessor last_frame(current);
665 constantPoolHandle pool(current, last_frame.method()->constants());
666 methodHandle m(current, last_frame.method());
667 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
668 bytecode == Bytecodes::_putstatic);
669 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
670
671 int field_index = last_frame.get_index_u2(bytecode);
672 {
673 JvmtiHideSingleStepping jhss(current);
674 JavaThread* THREAD = current; // For exception macros.
675 LinkResolver::resolve_field_access(info, pool, field_index,
676 m, bytecode, CHECK);
677 } // end JvmtiHideSingleStepping
678
679 // check if link resolution caused cpCache to be updated
680 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
681
682
683 // compute auxiliary field attributes
684 TosState state = as_TosState(info.field_type());
685
686 // Resolution of put instructions on final fields is delayed. That is required so that
687 // exceptions are thrown at the correct place (when the instruction is actually invoked).
688 // If we do not resolve an instruction in the current pass, leaving the put_code
689 // set to zero will cause the next put instruction to the same field to reresolve.
690
691 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
692 // to final instance fields with updates originating from a method different than <init>)
693 // is inhibited. A putfield instruction targeting an instance final field must throw
694 // an IllegalAccessError if the instruction is not in an instance
695 // initializer method <init>. If resolution were not inhibited, a putfield
696 // in an initializer method could be resolved in the initializer. Subsequent
697 // putfield instructions to the same field would then use cached information.
698 // As a result, those instructions would not pass through the VM. That is,
699 // checks in resolve_field_access() would not be executed for those instructions
700 // and the required IllegalAccessError would not be thrown.
701 //
702 // Also, we need to delay resolving getstatic and putstatic instructions until the
703 // class is initialized. This is required so that access to the static
704 // field will call the initialization function every time until the class
705 // is completely initialized ala. in 2.17.5 in JVM Specification.
706 InstanceKlass* klass = info.field_holder();
707 bool uninitialized_static = is_static && !klass->is_initialized();
708 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
709 info.has_initialized_final_update();
710 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
711
712 Bytecodes::Code get_code = (Bytecodes::Code)0;
713 Bytecodes::Code put_code = (Bytecodes::Code)0;
714 if (!uninitialized_static) {
715 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
716 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
717 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
718 }
719 }
720
721 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
722 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile());
723 entry->fill_in(info.field_holder(), info.offset(),
724 checked_cast<u2>(info.index()), checked_cast<u1>(state),
725 static_cast<u1>(get_code), static_cast<u1>(put_code));
726 }
727
728
729 //------------------------------------------------------------------------------------------------------------------------
730 // Synchronization
731 //
732 // The interpreter's synchronization code is factored out so that it can
733 // be shared by method invocation and synchronized blocks.
734 //%note synchronization_3
735
736 //%note monitor_1
737 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
738 #ifdef ASSERT
739 current->last_frame().interpreter_frame_verify_monitor(elem);
740 #endif
741 Handle h_obj(current, elem->obj());
742 assert(Universe::heap()->is_in_or_null(h_obj()),
743 "must be null or an object");
744 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
745 assert(Universe::heap()->is_in_or_null(elem->obj()),
746 "must be null or an object");
747 #ifdef ASSERT
748 current->last_frame().interpreter_frame_verify_monitor(elem);
749 #endif
750 JRT_END
751
752 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
753 oop obj = elem->obj();
754 assert(Universe::heap()->is_in(obj), "must be an object");
755 // The object could become unlocked through a JNI call, which we have no other checks for.
756 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
757 if (obj->is_unlocked()) {
758 if (CheckJNICalls) {
759 fatal("Object has been unlocked by JNI");
760 }
761 return;
762 }
763 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
764 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
765 // again at method exit or in the case of an exception.
766 elem->set_obj(nullptr);
767 JRT_END
768
769
770 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
771 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
772 JRT_END
773
774
775 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
776 // Returns an illegal exception to install into the current thread. The
777 // pending_exception flag is cleared so normal exception handling does not
778 // trigger. Any current installed exception will be overwritten. This
779 // method will be called during an exception unwind.
780
781 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
782 Handle exception(current, current->vm_result());
783 assert(exception() != nullptr, "vm result should be set");
784 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
785 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
786 current->set_vm_result(exception());
787 JRT_END
788
789
790 //------------------------------------------------------------------------------------------------------------------------
791 // Invokes
792
793 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
794 return method->orig_bytecode_at(method->bci_from(bcp));
795 JRT_END
796
797 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
798 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
799 JRT_END
800
801 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
802 JvmtiExport::post_raw_breakpoint(current, method, bcp);
803 JRT_END
804
805 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
806 LastFrameAccessor last_frame(current);
807 // extract receiver from the outgoing argument list if necessary
808 Handle receiver(current, nullptr);
809 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
810 bytecode == Bytecodes::_invokespecial) {
811 ResourceMark rm(current);
812 methodHandle m (current, last_frame.method());
813 Bytecode_invoke call(m, last_frame.bci());
814 Symbol* signature = call.signature();
815 receiver = Handle(current, last_frame.callee_receiver(signature));
816
817 assert(Universe::heap()->is_in_or_null(receiver()),
818 "sanity check");
819 assert(receiver.is_null() ||
820 !Universe::heap()->is_in(receiver->klass()),
821 "sanity check");
822 }
823
824 // resolve method
825 CallInfo info;
826 constantPoolHandle pool(current, last_frame.method()->constants());
827 ConstantPoolCache* cache = pool->cache();
828
829 methodHandle resolved_method;
830
831 int method_index = last_frame.get_index_u2(bytecode);
832 {
833 JvmtiHideSingleStepping jhss(current);
834 JavaThread* THREAD = current; // For exception macros.
835 LinkResolver::resolve_invoke(info, receiver, pool,
836 method_index, bytecode,
837 THREAD);
838
839 if (HAS_PENDING_EXCEPTION) {
840 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
841 // Preserve the original exception across the call to note_trap()
842 PreserveExceptionMark pm(current);
843 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
844 note_trap(current, Deoptimization::Reason_null_check);
845 }
846 return;
847 }
848
849 resolved_method = methodHandle(current, info.resolved_method());
850 } // end JvmtiHideSingleStepping
851
852 // Don't allow safepoints until the method is cached.
853 NoSafepointVerifier nsv;
854
855 // check if link resolution caused cpCache to be updated
856 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
857
858 #ifdef ASSERT
859 if (bytecode == Bytecodes::_invokeinterface) {
860 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
861 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
862 // (see also CallInfo::set_interface for details)
863 assert(info.call_kind() == CallInfo::vtable_call ||
864 info.call_kind() == CallInfo::direct_call, "");
865 assert(resolved_method->is_final() || info.has_vtable_index(),
866 "should have been set already");
867 } else if (!resolved_method->has_itable_index()) {
868 // Resolved something like CharSequence.toString. Use vtable not itable.
869 assert(info.call_kind() != CallInfo::itable_call, "");
870 } else {
871 // Setup itable entry
872 assert(info.call_kind() == CallInfo::itable_call, "");
873 int index = resolved_method->itable_index();
874 assert(info.itable_index() == index, "");
875 }
876 } else if (bytecode == Bytecodes::_invokespecial) {
877 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
878 } else {
879 assert(info.call_kind() == CallInfo::direct_call ||
880 info.call_kind() == CallInfo::vtable_call, "");
881 }
882 #endif
883 // Get sender and only set cpCache entry to resolved if it is not an
884 // interface. The receiver for invokespecial calls within interface
885 // methods must be checked for every call.
886 InstanceKlass* sender = pool->pool_holder();
887
888 switch (info.call_kind()) {
889 case CallInfo::direct_call:
890 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
891 break;
892 case CallInfo::vtable_call:
893 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
894 break;
895 case CallInfo::itable_call:
896 cache->set_itable_call(
897 bytecode,
898 method_index,
899 info.resolved_klass(),
900 resolved_method,
901 info.itable_index());
902 break;
903 default: ShouldNotReachHere();
904 }
905 }
906
907
908 // First time execution: Resolve symbols, create a permanent MethodType object.
909 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
910 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
911 LastFrameAccessor last_frame(current);
912
913 // resolve method
914 CallInfo info;
915 constantPoolHandle pool(current, last_frame.method()->constants());
916 int method_index = last_frame.get_index_u2(bytecode);
917 {
918 JvmtiHideSingleStepping jhss(current);
919 JavaThread* THREAD = current; // For exception macros.
920 LinkResolver::resolve_invoke(info, Handle(), pool,
921 method_index, bytecode,
922 CHECK);
923 } // end JvmtiHideSingleStepping
924
925 pool->cache()->set_method_handle(method_index, info);
926 }
927
928 // First time execution: Resolve symbols, create a permanent CallSite object.
929 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
930 LastFrameAccessor last_frame(current);
931 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
932
933 // resolve method
934 CallInfo info;
935 constantPoolHandle pool(current, last_frame.method()->constants());
936 int index = last_frame.get_index_u4(bytecode);
937 {
938 JvmtiHideSingleStepping jhss(current);
939 JavaThread* THREAD = current; // For exception macros.
940 LinkResolver::resolve_invoke(info, Handle(), pool,
941 index, bytecode, CHECK);
942 } // end JvmtiHideSingleStepping
943
944 pool->cache()->set_dynamic_call(info, pool->decode_invokedynamic_index(index));
945 }
946
947 // This function is the interface to the assembly code. It returns the resolved
948 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
949 // This function will check for redefinition!
950 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
951 switch (bytecode) {
952 case Bytecodes::_getstatic:
953 case Bytecodes::_putstatic:
954 case Bytecodes::_getfield:
955 case Bytecodes::_putfield:
956 resolve_get_put(current, bytecode);
957 break;
958 case Bytecodes::_invokevirtual:
959 case Bytecodes::_invokespecial:
960 case Bytecodes::_invokestatic:
961 case Bytecodes::_invokeinterface:
962 resolve_invoke(current, bytecode);
963 break;
964 case Bytecodes::_invokehandle:
965 resolve_invokehandle(current);
966 break;
967 case Bytecodes::_invokedynamic:
968 resolve_invokedynamic(current);
969 break;
970 default:
971 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
972 break;
973 }
974 }
975 JRT_END
976
977 //------------------------------------------------------------------------------------------------------------------------
978 // Miscellaneous
979
980
981 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
982 // Enable WXWrite: the function is called directly by interpreter.
983 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
984
985 // frequency_counter_overflow_inner can throw async exception.
986 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
987 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
988 if (branch_bcp != nullptr && nm != nullptr) {
989 // This was a successful request for an OSR nmethod. Because
990 // frequency_counter_overflow_inner ends with a safepoint check,
991 // nm could have been unloaded so look it up again. It's unsafe
992 // to examine nm directly since it might have been freed and used
993 // for something else.
994 LastFrameAccessor last_frame(current);
995 Method* method = last_frame.method();
996 int bci = method->bci_from(last_frame.bcp());
997 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
998 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
999 if (nm != nullptr && bs_nm != nullptr) {
1000 // in case the transition passed a safepoint we need to barrier this again
1001 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1002 nm = nullptr;
1003 }
1004 }
1005 }
1006 if (nm != nullptr && current->is_interp_only_mode()) {
1007 // Normally we never get an nm if is_interp_only_mode() is true, because
1008 // policy()->event has a check for this and won't compile the method when
1009 // true. However, it's possible for is_interp_only_mode() to become true
1010 // during the compilation. We don't want to return the nm in that case
1011 // because we want to continue to execute interpreted.
1012 nm = nullptr;
1013 }
1014 #ifndef PRODUCT
1015 if (TraceOnStackReplacement) {
1016 if (nm != nullptr) {
1017 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1018 nm->print();
1019 }
1020 }
1021 #endif
1022 return nm;
1023 }
1024
1025 JRT_ENTRY(nmethod*,
1026 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1027 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1028 // flag, in case this method triggers classloading which will call into Java.
1029 UnlockFlagSaver fs(current);
1030
1031 LastFrameAccessor last_frame(current);
1032 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1033 methodHandle method(current, last_frame.method());
1034 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1035 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1036
1037 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1038
1039 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1040 if (osr_nm != nullptr && bs_nm != nullptr) {
1041 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1042 osr_nm = nullptr;
1043 }
1044 }
1045 return osr_nm;
1046 JRT_END
1047
1048 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1049 assert(ProfileInterpreter, "must be profiling interpreter");
1050 int bci = method->bci_from(cur_bcp);
1051 MethodData* mdo = method->method_data();
1052 if (mdo == nullptr) return 0;
1053 return mdo->bci_to_di(bci);
1054 JRT_END
1055
1056 #ifdef ASSERT
1057 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1058 assert(ProfileInterpreter, "must be profiling interpreter");
1059
1060 MethodData* mdo = method->method_data();
1061 assert(mdo != nullptr, "must not be null");
1062
1063 int bci = method->bci_from(bcp);
1064
1065 address mdp2 = mdo->bci_to_dp(bci);
1066 if (mdp != mdp2) {
1067 ResourceMark rm;
1068 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1069 int current_di = mdo->dp_to_di(mdp);
1070 int expected_di = mdo->dp_to_di(mdp2);
1071 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1072 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1073 int approx_bci = -1;
1074 if (current_di >= 0) {
1075 approx_bci = mdo->data_at(current_di)->bci();
1076 }
1077 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1078 mdo->print_on(tty);
1079 method->print_codes();
1080 }
1081 assert(mdp == mdp2, "wrong mdp");
1082 JRT_END
1083 #endif // ASSERT
1084
1085 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1086 assert(ProfileInterpreter, "must be profiling interpreter");
1087 ResourceMark rm(current);
1088 LastFrameAccessor last_frame(current);
1089 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1090 MethodData* h_mdo = last_frame.method()->method_data();
1091
1092 // Grab a lock to ensure atomic access to setting the return bci and
1093 // the displacement. This can block and GC, invalidating all naked oops.
1094 MutexLocker ml(RetData_lock);
1095
1096 // ProfileData is essentially a wrapper around a derived oop, so we
1097 // need to take the lock before making any ProfileData structures.
1098 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1099 guarantee(data != nullptr, "profile data must be valid");
1100 RetData* rdata = data->as_RetData();
1101 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1102 last_frame.set_mdp(new_mdp);
1103 JRT_END
1104
1105 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1106 return Method::build_method_counters(current, m);
1107 JRT_END
1108
1109
1110 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1111 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1112 // stack traversal automatically takes care of preserving arguments for invoke, so
1113 // this is no longer needed.
1114
1115 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1116 // if this is called during a safepoint
1117
1118 if (JvmtiExport::should_post_single_step()) {
1119 // This function is called by the interpreter when single stepping. Such single
1120 // stepping could unwind a frame. Then, it is important that we process any frames
1121 // that we might return into.
1122 StackWatermarkSet::before_unwind(current);
1123
1124 // We are called during regular safepoints and when the VM is
1125 // single stepping. If any thread is marked for single stepping,
1126 // then we may have JVMTI work to do.
1127 LastFrameAccessor last_frame(current);
1128 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1129 }
1130 JRT_END
1131
1132 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1133 assert(current == JavaThread::current(), "pre-condition");
1134 // This function is called by the interpreter when the return poll found a reason
1135 // to call the VM. The reason could be that we are returning into a not yet safe
1136 // to access frame. We handle that below.
1137 // Note that this path does not check for single stepping, because we do not want
1138 // to single step when unwinding frames for an exception being thrown. Instead,
1139 // such single stepping code will use the safepoint table, which will use the
1140 // InterpreterRuntime::at_safepoint callback.
1141 StackWatermarkSet::before_unwind(current);
1142 JRT_END
1143
1144 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1145 ResolvedFieldEntry *entry))
1146
1147 // check the access_flags for the field in the klass
1148
1149 InstanceKlass* ik = entry->field_holder();
1150 int index = entry->field_index();
1151 if (!ik->field_status(index).is_access_watched()) return;
1152
1153 bool is_static = (obj == nullptr);
1154 HandleMark hm(current);
1155
1156 Handle h_obj;
1157 if (!is_static) {
1158 // non-static field accessors have an object, but we need a handle
1159 h_obj = Handle(current, obj);
1160 }
1161 InstanceKlass* field_holder = entry->field_holder(); // HERE
1162 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static);
1163 LastFrameAccessor last_frame(current);
1164 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1165 JRT_END
1166
1167 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1168 ResolvedFieldEntry *entry, jvalue *value))
1169
1170 InstanceKlass* ik = entry->field_holder();
1171
1172 // check the access_flags for the field in the klass
1173 int index = entry->field_index();
1174 // bail out if field modifications are not watched
1175 if (!ik->field_status(index).is_modification_watched()) return;
1176
1177 char sig_type = '\0';
1178
1179 switch((TosState)entry->tos_state()) {
1180 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1181 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1182 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1183 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1184 case itos: sig_type = JVM_SIGNATURE_INT; break;
1185 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1186 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1187 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1188 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1189 default: ShouldNotReachHere(); return;
1190 }
1191 bool is_static = (obj == nullptr);
1192
1193 HandleMark hm(current);
1194 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static);
1195 jvalue fvalue;
1196 #ifdef _LP64
1197 fvalue = *value;
1198 #else
1199 // Long/double values are stored unaligned and also noncontiguously with
1200 // tagged stacks. We can't just do a simple assignment even in the non-
1201 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1202 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1203 // We assume that the two halves of longs/doubles are stored in interpreter
1204 // stack slots in platform-endian order.
1205 jlong_accessor u;
1206 jint* newval = (jint*)value;
1207 u.words[0] = newval[0];
1208 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1209 fvalue.j = u.long_value;
1210 #endif // _LP64
1211
1212 Handle h_obj;
1213 if (!is_static) {
1214 // non-static field accessors have an object, but we need a handle
1215 h_obj = Handle(current, obj);
1216 }
1217
1218 LastFrameAccessor last_frame(current);
1219 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1220 fid, sig_type, &fvalue);
1221 JRT_END
1222
1223 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1224 LastFrameAccessor last_frame(current);
1225 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1226 JRT_END
1227
1228
1229 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1230 // before transitioning to VM, and restore it after transitioning back
1231 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1232 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1233 LastFrameAccessor last_frame(current);
1234 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1235 JRT_END
1236
1237 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1238 {
1239 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1240 }
1241 JRT_END
1242
1243
1244 // Implementation of SignatureHandlerLibrary
1245
1246 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1247 // Dummy definition (else normalization method is defined in CPU
1248 // dependent code)
1249 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1250 return fingerprint;
1251 }
1252 #endif
1253
1254 address SignatureHandlerLibrary::set_handler_blob() {
1255 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1256 if (handler_blob == nullptr) {
1257 return nullptr;
1258 }
1259 address handler = handler_blob->code_begin();
1260 _handler_blob = handler_blob;
1261 _handler = handler;
1262 return handler;
1263 }
1264
1265 void SignatureHandlerLibrary::initialize() {
1266 if (_fingerprints != nullptr) {
1267 return;
1268 }
1269 if (set_handler_blob() == nullptr) {
1270 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1271 }
1272
1273 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1274 SignatureHandlerLibrary::buffer_size);
1275 _buffer = bb->code_begin();
1276
1277 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1278 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1279 }
1280
1281 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1282 address handler = _handler;
1283 int insts_size = buffer->pure_insts_size();
1284 if (handler + insts_size > _handler_blob->code_end()) {
1285 // get a new handler blob
1286 handler = set_handler_blob();
1287 }
1288 if (handler != nullptr) {
1289 memcpy(handler, buffer->insts_begin(), insts_size);
1290 pd_set_handler(handler);
1291 ICache::invalidate_range(handler, insts_size);
1292 _handler = handler + insts_size;
1293 }
1294 return handler;
1295 }
1296
1297 void SignatureHandlerLibrary::add(const methodHandle& method) {
1298 if (method->signature_handler() == nullptr) {
1299 // use slow signature handler if we can't do better
1300 int handler_index = -1;
1301 // check if we can use customized (fast) signature handler
1302 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1303 // use customized signature handler
1304 MutexLocker mu(SignatureHandlerLibrary_lock);
1305 // make sure data structure is initialized
1306 initialize();
1307 // lookup method signature's fingerprint
1308 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1309 // allow CPU dependent code to optimize the fingerprints for the fast handler
1310 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1311 handler_index = _fingerprints->find(fingerprint);
1312 // create handler if necessary
1313 if (handler_index < 0) {
1314 ResourceMark rm;
1315 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1316 CodeBuffer buffer((address)(_buffer + align_offset),
1317 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1318 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1319 // copy into code heap
1320 address handler = set_handler(&buffer);
1321 if (handler == nullptr) {
1322 // use slow signature handler (without memorizing it in the fingerprints)
1323 } else {
1324 // debugging support
1325 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1326 ttyLocker ttyl;
1327 tty->cr();
1328 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1329 _handlers->length(),
1330 (method->is_static() ? "static" : "receiver"),
1331 method->name_and_sig_as_C_string(),
1332 fingerprint,
1333 buffer.insts_size());
1334 if (buffer.insts_size() > 0) {
1335 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1336 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1337 }
1338 #ifndef PRODUCT
1339 address rh_begin = Interpreter::result_handler(method()->result_type());
1340 if (CodeCache::contains(rh_begin)) {
1341 // else it might be special platform dependent values
1342 tty->print_cr(" --- associated result handler ---");
1343 address rh_end = rh_begin;
1344 while (*(int*)rh_end != 0) {
1345 rh_end += sizeof(int);
1346 }
1347 Disassembler::decode(rh_begin, rh_end);
1348 } else {
1349 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1350 }
1351 #endif
1352 }
1353 // add handler to library
1354 _fingerprints->append(fingerprint);
1355 _handlers->append(handler);
1356 // set handler index
1357 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1358 handler_index = _fingerprints->length() - 1;
1359 }
1360 }
1361 // Set handler under SignatureHandlerLibrary_lock
1362 if (handler_index < 0) {
1363 // use generic signature handler
1364 method->set_signature_handler(Interpreter::slow_signature_handler());
1365 } else {
1366 // set handler
1367 method->set_signature_handler(_handlers->at(handler_index));
1368 }
1369 } else {
1370 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1371 // use generic signature handler
1372 method->set_signature_handler(Interpreter::slow_signature_handler());
1373 }
1374 }
1375 #ifdef ASSERT
1376 int handler_index = -1;
1377 int fingerprint_index = -2;
1378 {
1379 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1380 // in any way if accessed from multiple threads. To avoid races with another
1381 // thread which may change the arrays in the above, mutex protected block, we
1382 // have to protect this read access here with the same mutex as well!
1383 MutexLocker mu(SignatureHandlerLibrary_lock);
1384 if (_handlers != nullptr) {
1385 handler_index = _handlers->find(method->signature_handler());
1386 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1387 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1388 fingerprint_index = _fingerprints->find(fingerprint);
1389 }
1390 }
1391 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1392 handler_index == fingerprint_index, "sanity check");
1393 #endif // ASSERT
1394 }
1395
1396 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1397 int handler_index = -1;
1398 // use customized signature handler
1399 MutexLocker mu(SignatureHandlerLibrary_lock);
1400 // make sure data structure is initialized
1401 initialize();
1402 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1403 handler_index = _fingerprints->find(fingerprint);
1404 // create handler if necessary
1405 if (handler_index < 0) {
1406 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1407 tty->cr();
1408 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1409 _handlers->length(),
1410 p2i(handler),
1411 fingerprint);
1412 }
1413 _fingerprints->append(fingerprint);
1414 _handlers->append(handler);
1415 } else {
1416 if (PrintSignatureHandlers) {
1417 tty->cr();
1418 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1419 _handlers->length(),
1420 fingerprint,
1421 p2i(_handlers->at(handler_index)),
1422 p2i(handler));
1423 }
1424 }
1425 }
1426
1427
1428 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1429 address SignatureHandlerLibrary::_handler = nullptr;
1430 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1431 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1432 address SignatureHandlerLibrary::_buffer = nullptr;
1433
1434
1435 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1436 methodHandle m(current, method);
1437 assert(m->is_native(), "sanity check");
1438 // lookup native function entry point if it doesn't exist
1439 if (!m->has_native_function()) {
1440 NativeLookup::lookup(m, CHECK);
1441 }
1442 // make sure signature handler is installed
1443 SignatureHandlerLibrary::add(m);
1444 // The interpreter entry point checks the signature handler first,
1445 // before trying to fetch the native entry point and klass mirror.
1446 // We must set the signature handler last, so that multiple processors
1447 // preparing the same method will be sure to see non-null entry & mirror.
1448 JRT_END
1449
1450 #if defined(IA32) || defined(AMD64) || defined(ARM)
1451 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1452 assert(current == JavaThread::current(), "pre-condition");
1453 if (src_address == dest_address) {
1454 return;
1455 }
1456 ResourceMark rm;
1457 LastFrameAccessor last_frame(current);
1458 assert(last_frame.is_interpreted_frame(), "");
1459 jint bci = last_frame.bci();
1460 methodHandle mh(current, last_frame.method());
1461 Bytecode_invoke invoke(mh, bci);
1462 ArgumentSizeComputer asc(invoke.signature());
1463 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1464 Copy::conjoint_jbytes(src_address, dest_address,
1465 size_of_arguments * Interpreter::stackElementSize);
1466 JRT_END
1467 #endif
1468
1469 #if INCLUDE_JVMTI
1470 // This is a support of the JVMTI PopFrame interface.
1471 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1472 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1473 // The member_name argument is a saved reference (in local#0) to the member_name.
1474 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1475 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1476 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1477 Method* method, address bcp))
1478 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1479 if (code != Bytecodes::_invokestatic) {
1480 return;
1481 }
1482 ConstantPool* cpool = method->constants();
1483 int cp_index = Bytes::get_native_u2(bcp + 1);
1484 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1485 Symbol* mname = cpool->name_ref_at(cp_index, code);
1486
1487 if (MethodHandles::has_member_arg(cname, mname)) {
1488 oop member_name_oop = cast_to_oop(member_name);
1489 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1490 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1491 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1492 }
1493 current->set_vm_result(member_name_oop);
1494 } else {
1495 current->set_vm_result(nullptr);
1496 }
1497 JRT_END
1498 #endif // INCLUDE_JVMTI
1499
1500 #ifndef PRODUCT
1501 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1502 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1503 // The generated code still uses call_VM because that will set up the frame pointer for
1504 // bcp and method.
1505 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1506 assert(current == JavaThread::current(), "pre-condition");
1507 LastFrameAccessor last_frame(current);
1508 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1509 methodHandle mh(current, last_frame.method());
1510 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1511 return preserve_this_value;
1512 JRT_END
1513 #endif // !PRODUCT