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 oop obj = klass->allocate_instance(CHECK);
227 current->set_vm_result(obj);
228 JRT_END
229
230
231 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
232 oop obj = oopFactory::new_typeArray(type, size, CHECK);
233 current->set_vm_result(obj);
234 JRT_END
235
236
237 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
238 Klass* klass = pool->klass_at(index, CHECK);
239 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
240 current->set_vm_result(obj);
241 JRT_END
242
243
244 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
245 // We may want to pass in more arguments - could make this slightly faster
246 LastFrameAccessor last_frame(current);
247 ConstantPool* constants = last_frame.method()->constants();
248 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
249 Klass* klass = constants->klass_at(i, CHECK);
250 int nof_dims = last_frame.number_of_dimensions();
251 assert(klass->is_klass(), "not a class");
252 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
253
254 // We must create an array of jints to pass to multi_allocate.
255 ResourceMark rm(current);
256 const int small_dims = 10;
257 jint dim_array[small_dims];
258 jint *dims = &dim_array[0];
259 if (nof_dims > small_dims) {
260 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
261 }
262 for (int index = 0; index < nof_dims; index++) {
263 // offset from first_size_address is addressed as local[index]
264 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
265 dims[index] = first_size_address[n];
266 }
267 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
268 current->set_vm_result(obj);
269 JRT_END
270
271
272 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
273 assert(oopDesc::is_oop(obj), "must be a valid oop");
274 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
275 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
276 JRT_END
277
278
279 // Quicken instance-of and check-cast bytecodes
280 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
281 // Force resolving; quicken the bytecode
282 LastFrameAccessor last_frame(current);
283 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
284 ConstantPool* cpool = last_frame.method()->constants();
285 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
286 // program we might have seen an unquick'd bytecode in the interpreter but have another
287 // thread quicken the bytecode before we get here.
288 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
289 Klass* klass = cpool->klass_at(which, CHECK);
290 current->set_vm_result_2(klass);
291 JRT_END
292
293
294 //------------------------------------------------------------------------------------------------------------------------
295 // Exceptions
296
297 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
298 const methodHandle& trap_method, int trap_bci) {
299 if (trap_method.not_null()) {
300 MethodData* trap_mdo = trap_method->method_data();
301 if (trap_mdo == nullptr) {
302 ExceptionMark em(current);
303 JavaThread* THREAD = current; // For exception macros.
304 Method::build_profiling_method_data(trap_method, THREAD);
305 if (HAS_PENDING_EXCEPTION) {
306 // Only metaspace OOM is expected. No Java code executed.
307 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
308 "we expect only an OOM error here");
309 CLEAR_PENDING_EXCEPTION;
310 }
311 trap_mdo = trap_method->method_data();
312 // and fall through...
313 }
314 if (trap_mdo != nullptr) {
315 // Update per-method count of trap events. The interpreter
316 // is updating the MDO to simulate the effect of compiler traps.
317 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
318 }
319 }
320 }
321
322 // Assume the compiler is (or will be) interested in this event.
323 // If necessary, create an MDO to hold the information, and record it.
324 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
325 assert(ProfileTraps, "call me only if profiling");
326 LastFrameAccessor last_frame(current);
327 methodHandle trap_method(current, last_frame.method());
328 int trap_bci = trap_method->bci_from(last_frame.bcp());
329 note_trap_inner(current, reason, trap_method, trap_bci);
330 }
331
332 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
333 // get klass
334 InstanceKlass* klass = InstanceKlass::cast(k);
335 assert(klass->is_initialized(),
336 "this klass should have been initialized during VM initialization");
337 // create instance - do not call constructor since we may have no
338 // (java) stack space left (should assert constructor is empty)
339 Handle exception;
340 oop exception_oop = klass->allocate_instance(CHECK_(exception));
341 exception = Handle(THREAD, exception_oop);
342 if (StackTraceInThrowable) {
343 java_lang_Throwable::fill_in_stack_trace(exception);
344 }
345 return exception;
346 }
347
348 // Special handling for stack overflow: since we don't have any (java) stack
349 // space left we use the pre-allocated & pre-initialized StackOverflowError
350 // klass to create an stack overflow error instance. We do not call its
351 // constructor for the same reason (it is empty, anyway).
352 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
353 Handle exception = get_preinitialized_exception(
354 vmClasses::StackOverflowError_klass(),
355 CHECK);
356 // Increment counter for hs_err file reporting
357 Atomic::inc(&Exceptions::_stack_overflow_errors);
358 // Remove the ScopedValue bindings in case we got a StackOverflowError
359 // while we were trying to manipulate ScopedValue bindings.
360 current->clear_scopedValueBindings();
361 THROW_HANDLE(exception);
362 JRT_END
363
364 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
365 Handle exception = get_preinitialized_exception(
366 vmClasses::StackOverflowError_klass(),
367 CHECK);
368 java_lang_Throwable::set_message(exception(),
369 Universe::delayed_stack_overflow_error_message());
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::create_exception(JavaThread* current, char* name, char* message))
379 // lookup exception klass
380 TempNewSymbol s = SymbolTable::new_symbol(name);
381 if (ProfileTraps) {
382 if (s == vmSymbols::java_lang_ArithmeticException()) {
383 note_trap(current, Deoptimization::Reason_div0_check);
384 } else if (s == vmSymbols::java_lang_NullPointerException()) {
385 note_trap(current, Deoptimization::Reason_null_check);
386 }
387 }
388 // create exception
389 Handle exception = Exceptions::new_exception(current, s, message);
390 current->set_vm_result(exception());
391 JRT_END
392
393
394 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
395 // Produce the error message first because note_trap can safepoint
396 ResourceMark rm(current);
397 const char* klass_name = obj->klass()->external_name();
398 // lookup exception klass
399 TempNewSymbol s = SymbolTable::new_symbol(name);
400 if (ProfileTraps) {
401 if (s == vmSymbols::java_lang_ArrayStoreException()) {
402 note_trap(current, Deoptimization::Reason_array_check);
403 } else {
404 note_trap(current, Deoptimization::Reason_class_check);
405 }
406 }
407 // create exception, with klass name as detail message
408 Handle exception = Exceptions::new_exception(current, s, klass_name);
409 current->set_vm_result(exception());
410 JRT_END
411
412 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
413 // Produce the error message first because note_trap can safepoint
414 ResourceMark rm(current);
415 stringStream ss;
416 ss.print("Index %d out of bounds for length %d", index, a->length());
417
418 if (ProfileTraps) {
419 note_trap(current, Deoptimization::Reason_range_check);
420 }
421
422 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
423 JRT_END
424
425 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
426 JavaThread* current, oopDesc* obj))
427
428 // Produce the error message first because note_trap can safepoint
429 ResourceMark rm(current);
430 char* message = SharedRuntime::generate_class_cast_message(
431 current, obj->klass());
432
433 if (ProfileTraps) {
434 note_trap(current, Deoptimization::Reason_class_check);
435 }
436
437 // create exception
438 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
439 JRT_END
440
441 // exception_handler_for_exception(...) returns the continuation address,
442 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
443 // The exception oop is returned to make sure it is preserved over GC (it
444 // is only on the stack if the exception was thrown explicitly via athrow).
445 // During this operation, the expression stack contains the values for the
446 // bci where the exception happened. If the exception was propagated back
447 // from a call, the expression stack contains the values for the bci at the
448 // invoke w/o arguments (i.e., as if one were inside the call).
449 // Note that the implementation of this method assumes it's only called when an exception has actually occured
450 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
451 // We get here after we have unwound from a callee throwing an exception
452 // into the interpreter. Any deferred stack processing is notified of
453 // the event via the StackWatermarkSet.
454 StackWatermarkSet::after_unwind(current);
455
456 LastFrameAccessor last_frame(current);
457 Handle h_exception(current, exception);
458 methodHandle h_method (current, last_frame.method());
459 constantPoolHandle h_constants(current, h_method->constants());
460 bool should_repeat;
461 int handler_bci;
462 int current_bci = last_frame.bci();
463
464 if (current->frames_to_pop_failed_realloc() > 0) {
465 // Allocation of scalar replaced object used in this frame
466 // failed. Unconditionally pop the frame.
467 current->dec_frames_to_pop_failed_realloc();
468 current->set_vm_result(h_exception());
469 // If the method is synchronized we already unlocked the monitor
470 // during deoptimization so the interpreter needs to skip it when
471 // the frame is popped.
472 current->set_do_not_unlock_if_synchronized(true);
473 return Interpreter::remove_activation_entry();
474 }
475
476 // Need to do this check first since when _do_not_unlock_if_synchronized
477 // is set, we don't want to trigger any classloading which may make calls
478 // into java, or surprisingly find a matching exception handler for bci 0
479 // since at this moment the method hasn't been "officially" entered yet.
480 if (current->do_not_unlock_if_synchronized()) {
481 ResourceMark rm;
482 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
483 current->set_vm_result(exception);
484 return Interpreter::remove_activation_entry();
485 }
486
487 do {
488 should_repeat = false;
489
490 // assertions
491 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
492 // Check that exception is a subclass of Throwable.
493 assert(h_exception->is_a(vmClasses::Throwable_klass()),
494 "Exception not subclass of Throwable");
495
496 // tracing
497 if (log_is_enabled(Info, exceptions)) {
498 ResourceMark rm(current);
499 stringStream tempst;
500 tempst.print("interpreter method <%s>\n"
501 " at bci %d for thread " INTPTR_FORMAT " (%s)",
502 h_method->print_value_string(), current_bci, p2i(current), current->name());
503 Exceptions::log_exception(h_exception, tempst.as_string());
504 }
505 // Don't go paging in something which won't be used.
506 // else if (extable->length() == 0) {
507 // // disabled for now - interpreter is not using shortcut yet
508 // // (shortcut is not to call runtime if we have no exception handlers)
509 // // warning("performance bug: should not call runtime if method has no exception handlers");
510 // }
511 // for AbortVMOnException flag
512 Exceptions::debug_check_abort(h_exception);
513
514 // exception handler lookup
515 Klass* klass = h_exception->klass();
516 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
517 if (HAS_PENDING_EXCEPTION) {
518 // We threw an exception while trying to find the exception handler.
519 // Transfer the new exception to the exception handle which will
520 // be set into thread local storage, and do another lookup for an
521 // exception handler for this exception, this time starting at the
522 // BCI of the exception handler which caused the exception to be
523 // thrown (bug 4307310).
524 h_exception = Handle(THREAD, PENDING_EXCEPTION);
525 CLEAR_PENDING_EXCEPTION;
526 if (handler_bci >= 0) {
527 current_bci = handler_bci;
528 should_repeat = true;
529 }
530 }
531 } while (should_repeat == true);
532
533 #if INCLUDE_JVMCI
534 if (EnableJVMCI && h_method->method_data() != nullptr) {
535 ResourceMark rm(current);
536 MethodData* mdo = h_method->method_data();
537
538 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
539 MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
540
541 ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
542 if (pdata != nullptr && pdata->is_BitData()) {
543 BitData* bit_data = (BitData*) pdata;
544 bit_data->set_exception_seen();
545 }
546 }
547 #endif
548
549 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
550 // time throw or a stack unwinding throw and accordingly notify the debugger
551 if (JvmtiExport::can_post_on_exceptions()) {
552 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
553 }
554
555 address continuation = nullptr;
556 address handler_pc = nullptr;
557 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
558 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
559 // handler in this method, or (b) after a stack overflow there is not yet
560 // enough stack space available to reprotect the stack.
561 continuation = Interpreter::remove_activation_entry();
562 #if COMPILER2_OR_JVMCI
563 // Count this for compilation purposes
564 h_method->interpreter_throwout_increment(THREAD);
565 #endif
566 } else {
567 // handler in this method => change bci/bcp to handler bci/bcp and continue there
568 handler_pc = h_method->code_base() + handler_bci;
569 h_method->set_exception_handler_entered(handler_bci); // profiling
570 #ifndef ZERO
571 set_bcp_and_mdp(handler_pc, current);
572 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
573 #else
574 continuation = (address)(intptr_t) handler_bci;
575 #endif
576 }
577
578 // notify debugger of an exception catch
579 // (this is good for exceptions caught in native methods as well)
580 if (JvmtiExport::can_post_on_exceptions()) {
581 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
582 }
583
584 current->set_vm_result(h_exception());
585 return continuation;
586 JRT_END
587
588
589 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
590 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
591 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
592 JRT_END
593
594
595 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
596 THROW(vmSymbols::java_lang_AbstractMethodError());
597 JRT_END
598
599 // This method is called from the "abstract_entry" of the interpreter.
600 // At that point, the arguments have already been removed from the stack
601 // and therefore we don't have the receiver object at our fingertips. (Though,
602 // on some platforms the receiver still resides in a register...). Thus,
603 // we have no choice but print an error message not containing the receiver
604 // type.
605 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
606 Method* missingMethod))
607 ResourceMark rm(current);
608 assert(missingMethod != nullptr, "sanity");
609 methodHandle m(current, missingMethod);
610 LinkResolver::throw_abstract_method_error(m, THREAD);
611 JRT_END
612
613 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
614 Klass* recvKlass,
615 Method* missingMethod))
616 ResourceMark rm(current);
617 methodHandle mh = methodHandle(current, missingMethod);
618 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
619 JRT_END
620
621
622 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
623 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
624 JRT_END
625
626 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
627 Klass* recvKlass,
628 Klass* interfaceKlass))
629 ResourceMark rm(current);
630 char buf[1000];
631 buf[0] = '\0';
632 jio_snprintf(buf, sizeof(buf),
633 "Class %s does not implement the requested interface %s",
634 recvKlass ? recvKlass->external_name() : "nullptr",
635 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
636 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
637 JRT_END
638
639 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
640 THROW(vmSymbols::java_lang_NullPointerException());
641 JRT_END
642
643 //------------------------------------------------------------------------------------------------------------------------
644 // Fields
645 //
646
647 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
648 LastFrameAccessor last_frame(current);
649 constantPoolHandle pool(current, last_frame.method()->constants());
650 methodHandle m(current, last_frame.method());
651
652 resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, true /*initialize_holder*/, current);
653 }
654
655 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
656 methodHandle& m,
657 constantPoolHandle& pool,
658 bool initialize_holder, TRAPS) {
659 fieldDescriptor info;
660 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
661 bytecode == Bytecodes::_putstatic);
662 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
663
664 {
665 JvmtiHideSingleStepping jhss(THREAD);
666 LinkResolver::resolve_field_access(info, pool, field_index,
667 m, bytecode, initialize_holder, CHECK);
668 } // end JvmtiHideSingleStepping
669
670 // check if link resolution caused cpCache to be updated
671 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
672
673 // compute auxiliary field attributes
674 TosState state = as_TosState(info.field_type());
675
676 // Resolution of put instructions on final fields is delayed. That is required so that
677 // exceptions are thrown at the correct place (when the instruction is actually invoked).
678 // If we do not resolve an instruction in the current pass, leaving the put_code
679 // set to zero will cause the next put instruction to the same field to reresolve.
680
681 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
682 // to final instance fields with updates originating from a method different than <init>)
683 // is inhibited. A putfield instruction targeting an instance final field must throw
684 // an IllegalAccessError if the instruction is not in an instance
685 // initializer method <init>. If resolution were not inhibited, a putfield
686 // in an initializer method could be resolved in the initializer. Subsequent
687 // putfield instructions to the same field would then use cached information.
688 // As a result, those instructions would not pass through the VM. That is,
689 // checks in resolve_field_access() would not be executed for those instructions
690 // and the required IllegalAccessError would not be thrown.
691 //
692 // Also, we need to delay resolving getstatic and putstatic instructions until the
693 // class is initialized. This is required so that access to the static
694 // field will call the initialization function every time until the class
695 // is completely initialized ala. in 2.17.5 in JVM Specification.
696 InstanceKlass* klass = info.field_holder();
697 bool uninitialized_static = is_static && !klass->is_initialized();
698 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
699 info.has_initialized_final_update();
700 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
701
702 Bytecodes::Code get_code = (Bytecodes::Code)0;
703 Bytecodes::Code put_code = (Bytecodes::Code)0;
704 if (!uninitialized_static) {
705 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
706 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
707 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
708 }
709 }
710
711 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
712 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile());
713 entry->fill_in(info.field_holder(), info.offset(),
714 checked_cast<u2>(info.index()), checked_cast<u1>(state),
715 static_cast<u1>(get_code), static_cast<u1>(put_code));
716 }
717
718
719 //------------------------------------------------------------------------------------------------------------------------
720 // Synchronization
721 //
722 // The interpreter's synchronization code is factored out so that it can
723 // be shared by method invocation and synchronized blocks.
724 //%note synchronization_3
725
726 //%note monitor_1
727 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
728 assert(LockingMode != LM_LIGHTWEIGHT, "Should call monitorenter_obj() when using the new lightweight locking");
729 #ifdef ASSERT
730 current->last_frame().interpreter_frame_verify_monitor(elem);
731 #endif
732 Handle h_obj(current, elem->obj());
733 assert(Universe::heap()->is_in_or_null(h_obj()),
734 "must be null or an object");
735 ThreadOnMonitorEnter tme(current);
736 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
737 assert(Universe::heap()->is_in_or_null(elem->obj()),
738 "must be null or an object");
739 #ifdef ASSERT
740 if (!current->preempting()) current->last_frame().interpreter_frame_verify_monitor(elem);
741 #endif
742 JRT_END
743
744 // NOTE: We provide a separate implementation for the new lightweight locking to workaround a limitation
745 // of registers in x86_32. This entry point accepts an oop instead of a BasicObjectLock*.
746 // The problem is that we would need to preserve the register that holds the BasicObjectLock,
747 // but we are using that register to hold the thread. We don't have enough registers to
748 // also keep the BasicObjectLock, but we don't really need it anyway, we only need
749 // the object. See also InterpreterMacroAssembler::lock_object().
750 // As soon as legacy stack-locking goes away we could remove the other monitorenter() entry
751 // point, and only use oop-accepting entries (same for monitorexit() below).
752 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter_obj(JavaThread* current, oopDesc* obj))
753 assert(LockingMode == LM_LIGHTWEIGHT, "Should call monitorenter() when not using the new lightweight locking");
754 Handle h_obj(current, cast_to_oop(obj));
755 assert(Universe::heap()->is_in_or_null(h_obj()),
756 "must be null or an object");
757 ThreadOnMonitorEnter tme(current);
758 ObjectSynchronizer::enter(h_obj, nullptr, current);
759 return;
760 JRT_END
761
762 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
763 oop obj = elem->obj();
764 assert(Universe::heap()->is_in(obj), "must be an object");
765 // The object could become unlocked through a JNI call, which we have no other checks for.
766 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
767 if (obj->is_unlocked()) {
768 if (CheckJNICalls) {
769 fatal("Object has been unlocked by JNI");
770 }
771 return;
772 }
773 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
774 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
775 // again at method exit or in the case of an exception.
776 elem->set_obj(nullptr);
777 JRT_END
778
779
780 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
781 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
782 JRT_END
783
784
785 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
786 // Returns an illegal exception to install into the current thread. The
787 // pending_exception flag is cleared so normal exception handling does not
788 // trigger. Any current installed exception will be overwritten. This
789 // method will be called during an exception unwind.
790
791 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
792 Handle exception(current, current->vm_result());
793 assert(exception() != nullptr, "vm result should be set");
794 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
795 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
796 current->set_vm_result(exception());
797 JRT_END
798
799
800 //------------------------------------------------------------------------------------------------------------------------
801 // Invokes
802
803 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
804 return method->orig_bytecode_at(method->bci_from(bcp));
805 JRT_END
806
807 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
808 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
809 JRT_END
810
811 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
812 JvmtiExport::post_raw_breakpoint(current, method, bcp);
813 JRT_END
814
815 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
816 LastFrameAccessor last_frame(current);
817 // extract receiver from the outgoing argument list if necessary
818 Handle receiver(current, nullptr);
819 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
820 bytecode == Bytecodes::_invokespecial) {
821 ResourceMark rm(current);
822 methodHandle m (current, last_frame.method());
823 Bytecode_invoke call(m, last_frame.bci());
824 Symbol* signature = call.signature();
825 receiver = Handle(current, last_frame.callee_receiver(signature));
826
827 assert(Universe::heap()->is_in_or_null(receiver()),
828 "sanity check");
829 assert(receiver.is_null() ||
830 !Universe::heap()->is_in(receiver->klass()),
831 "sanity check");
832 }
833
834 // resolve method
835 CallInfo info;
836 constantPoolHandle pool(current, last_frame.method()->constants());
837
838 methodHandle resolved_method;
839
840 int method_index = last_frame.get_index_u2(bytecode);
841 {
842 JvmtiHideSingleStepping jhss(current);
843 JavaThread* THREAD = current; // For exception macros.
844 LinkResolver::resolve_invoke(info, receiver, pool,
845 method_index, bytecode,
846 THREAD);
847
848 if (HAS_PENDING_EXCEPTION) {
849 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
850 // Preserve the original exception across the call to note_trap()
851 PreserveExceptionMark pm(current);
852 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
853 note_trap(current, Deoptimization::Reason_null_check);
854 }
855 return;
856 }
857
858 resolved_method = methodHandle(current, info.resolved_method());
859 } // end JvmtiHideSingleStepping
860
861 update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
862 }
863
864 void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
865 methodHandle& resolved_method,
866 constantPoolHandle& pool,
867 int method_index) {
868 // Don't allow safepoints until the method is cached.
869 NoSafepointVerifier nsv;
870
871 // check if link resolution caused cpCache to be updated
872 ConstantPoolCache* cache = pool->cache();
873 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
874
875 #ifdef ASSERT
876 if (bytecode == Bytecodes::_invokeinterface) {
877 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
878 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
879 // (see also CallInfo::set_interface for details)
880 assert(info.call_kind() == CallInfo::vtable_call ||
881 info.call_kind() == CallInfo::direct_call, "");
882 assert(resolved_method->is_final() || info.has_vtable_index(),
883 "should have been set already");
884 } else if (!resolved_method->has_itable_index()) {
885 // Resolved something like CharSequence.toString. Use vtable not itable.
886 assert(info.call_kind() != CallInfo::itable_call, "");
887 } else {
888 // Setup itable entry
889 assert(info.call_kind() == CallInfo::itable_call, "");
890 int index = resolved_method->itable_index();
891 assert(info.itable_index() == index, "");
892 }
893 } else if (bytecode == Bytecodes::_invokespecial) {
894 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
895 } else {
896 assert(info.call_kind() == CallInfo::direct_call ||
897 info.call_kind() == CallInfo::vtable_call, "");
898 }
899 #endif
900 // Get sender and only set cpCache entry to resolved if it is not an
901 // interface. The receiver for invokespecial calls within interface
902 // methods must be checked for every call.
903 InstanceKlass* sender = pool->pool_holder();
904
905 switch (info.call_kind()) {
906 case CallInfo::direct_call:
907 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
908 break;
909 case CallInfo::vtable_call:
910 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
911 break;
912 case CallInfo::itable_call:
913 cache->set_itable_call(
914 bytecode,
915 method_index,
916 info.resolved_klass(),
917 resolved_method,
918 info.itable_index());
919 break;
920 default: ShouldNotReachHere();
921 }
922 }
923
924 void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
925 constantPoolHandle& pool, TRAPS) {
926 LinkInfo link_info(pool, method_index, bytecode, CHECK);
927
928 if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
929 CallInfo call_info;
930 switch (bytecode) {
931 case Bytecodes::_invokevirtual: LinkResolver::cds_resolve_virtual_call (call_info, link_info, CHECK); break;
932 case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
933 case Bytecodes::_invokespecial: LinkResolver::cds_resolve_special_call (call_info, link_info, CHECK); break;
934
935 default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
936 }
937 methodHandle resolved_method(THREAD, call_info.resolved_method());
938 guarantee(resolved_method->method_holder()->is_linked(), "");
939 update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
940 } else {
941 // FIXME: why a shared class is not linked yet?
942 // Can't link it here since there are no guarantees it'll be prelinked on the next run.
943 ResourceMark rm;
944 InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
945 log_info(cds, resolve)("Not resolved: class not linked: %s %s %s",
946 resolved_iklass->is_shared() ? "is_shared" : "",
947 resolved_iklass->init_state_name(),
948 resolved_iklass->external_name());
949 }
950 }
951
952 // First time execution: Resolve symbols, create a permanent MethodType object.
953 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
954 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
955 LastFrameAccessor last_frame(current);
956
957 // resolve method
958 CallInfo info;
959 constantPoolHandle pool(current, last_frame.method()->constants());
960 int method_index = last_frame.get_index_u2(bytecode);
961 {
962 JvmtiHideSingleStepping jhss(current);
963 JavaThread* THREAD = current; // For exception macros.
964 LinkResolver::resolve_invoke(info, Handle(), pool,
965 method_index, bytecode,
966 CHECK);
967 } // end JvmtiHideSingleStepping
968
969 pool->cache()->set_method_handle(method_index, info);
970 }
971
972 // First time execution: Resolve symbols, create a permanent CallSite object.
973 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
974 LastFrameAccessor last_frame(current);
975 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
976
977 // resolve method
978 CallInfo info;
979 constantPoolHandle pool(current, last_frame.method()->constants());
980 int index = last_frame.get_index_u4(bytecode);
981 {
982 JvmtiHideSingleStepping jhss(current);
983 JavaThread* THREAD = current; // For exception macros.
984 LinkResolver::resolve_invoke(info, Handle(), pool,
985 index, bytecode, CHECK);
986 } // end JvmtiHideSingleStepping
987
988 pool->cache()->set_dynamic_call(info, index);
989 }
990
991 // This function is the interface to the assembly code. It returns the resolved
992 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
993 // This function will check for redefinition!
994 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
995 switch (bytecode) {
996 case Bytecodes::_getstatic:
997 case Bytecodes::_putstatic:
998 case Bytecodes::_getfield:
999 case Bytecodes::_putfield:
1000 resolve_get_put(current, bytecode);
1001 break;
1002 case Bytecodes::_invokevirtual:
1003 case Bytecodes::_invokespecial:
1004 case Bytecodes::_invokestatic:
1005 case Bytecodes::_invokeinterface:
1006 resolve_invoke(current, bytecode);
1007 break;
1008 case Bytecodes::_invokehandle:
1009 resolve_invokehandle(current);
1010 break;
1011 case Bytecodes::_invokedynamic:
1012 resolve_invokedynamic(current);
1013 break;
1014 default:
1015 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1016 break;
1017 }
1018 }
1019 JRT_END
1020
1021 //------------------------------------------------------------------------------------------------------------------------
1022 // Miscellaneous
1023
1024
1025 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1026 // Enable WXWrite: the function is called directly by interpreter.
1027 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1028
1029 // frequency_counter_overflow_inner can throw async exception.
1030 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1031 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1032 if (branch_bcp != nullptr && nm != nullptr) {
1033 // This was a successful request for an OSR nmethod. Because
1034 // frequency_counter_overflow_inner ends with a safepoint check,
1035 // nm could have been unloaded so look it up again. It's unsafe
1036 // to examine nm directly since it might have been freed and used
1037 // for something else.
1038 LastFrameAccessor last_frame(current);
1039 Method* method = last_frame.method();
1040 int bci = method->bci_from(last_frame.bcp());
1041 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1042 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1043 if (nm != nullptr && bs_nm != nullptr) {
1044 // in case the transition passed a safepoint we need to barrier this again
1045 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1046 nm = nullptr;
1047 }
1048 }
1049 }
1050 if (nm != nullptr && current->is_interp_only_mode()) {
1051 // Normally we never get an nm if is_interp_only_mode() is true, because
1052 // policy()->event has a check for this and won't compile the method when
1053 // true. However, it's possible for is_interp_only_mode() to become true
1054 // during the compilation. We don't want to return the nm in that case
1055 // because we want to continue to execute interpreted.
1056 nm = nullptr;
1057 }
1058 #ifndef PRODUCT
1059 if (TraceOnStackReplacement) {
1060 if (nm != nullptr) {
1061 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1062 nm->print();
1063 }
1064 }
1065 #endif
1066 return nm;
1067 }
1068
1069 JRT_ENTRY(nmethod*,
1070 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1071 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1072 // flag, in case this method triggers classloading which will call into Java.
1073 UnlockFlagSaver fs(current);
1074
1075 LastFrameAccessor last_frame(current);
1076 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1077 methodHandle method(current, last_frame.method());
1078 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1079 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1080
1081 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1082
1083 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1084 if (osr_nm != nullptr && bs_nm != nullptr) {
1085 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1086 osr_nm = nullptr;
1087 }
1088 }
1089 return osr_nm;
1090 JRT_END
1091
1092 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1093 assert(ProfileInterpreter, "must be profiling interpreter");
1094 int bci = method->bci_from(cur_bcp);
1095 MethodData* mdo = method->method_data();
1096 if (mdo == nullptr) return 0;
1097 return mdo->bci_to_di(bci);
1098 JRT_END
1099
1100 #ifdef ASSERT
1101 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1102 assert(ProfileInterpreter, "must be profiling interpreter");
1103
1104 MethodData* mdo = method->method_data();
1105 assert(mdo != nullptr, "must not be null");
1106
1107 int bci = method->bci_from(bcp);
1108
1109 address mdp2 = mdo->bci_to_dp(bci);
1110 if (mdp != mdp2) {
1111 ResourceMark rm;
1112 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1113 int current_di = mdo->dp_to_di(mdp);
1114 int expected_di = mdo->dp_to_di(mdp2);
1115 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1116 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1117 int approx_bci = -1;
1118 if (current_di >= 0) {
1119 approx_bci = mdo->data_at(current_di)->bci();
1120 }
1121 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1122 mdo->print_on(tty);
1123 method->print_codes();
1124 }
1125 assert(mdp == mdp2, "wrong mdp");
1126 JRT_END
1127 #endif // ASSERT
1128
1129 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1130 assert(ProfileInterpreter, "must be profiling interpreter");
1131 ResourceMark rm(current);
1132 LastFrameAccessor last_frame(current);
1133 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1134 MethodData* h_mdo = last_frame.method()->method_data();
1135
1136 // Grab a lock to ensure atomic access to setting the return bci and
1137 // the displacement. This can block and GC, invalidating all naked oops.
1138 MutexLocker ml(RetData_lock);
1139
1140 // ProfileData is essentially a wrapper around a derived oop, so we
1141 // need to take the lock before making any ProfileData structures.
1142 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1143 guarantee(data != nullptr, "profile data must be valid");
1144 RetData* rdata = data->as_RetData();
1145 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1146 last_frame.set_mdp(new_mdp);
1147 JRT_END
1148
1149 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1150 return Method::build_method_counters(current, m);
1151 JRT_END
1152
1153
1154 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1155 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1156 // stack traversal automatically takes care of preserving arguments for invoke, so
1157 // this is no longer needed.
1158
1159 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1160 // if this is called during a safepoint
1161
1162 if (JvmtiExport::should_post_single_step()) {
1163 // This function is called by the interpreter when single stepping. Such single
1164 // stepping could unwind a frame. Then, it is important that we process any frames
1165 // that we might return into.
1166 StackWatermarkSet::before_unwind(current);
1167
1168 // We are called during regular safepoints and when the VM is
1169 // single stepping. If any thread is marked for single stepping,
1170 // then we may have JVMTI work to do.
1171 LastFrameAccessor last_frame(current);
1172 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1173 }
1174 JRT_END
1175
1176 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1177 assert(current == JavaThread::current(), "pre-condition");
1178 // This function is called by the interpreter when the return poll found a reason
1179 // to call the VM. The reason could be that we are returning into a not yet safe
1180 // to access frame. We handle that below.
1181 // Note that this path does not check for single stepping, because we do not want
1182 // to single step when unwinding frames for an exception being thrown. Instead,
1183 // such single stepping code will use the safepoint table, which will use the
1184 // InterpreterRuntime::at_safepoint callback.
1185 StackWatermarkSet::before_unwind(current);
1186 JRT_END
1187
1188 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1189 ResolvedFieldEntry *entry))
1190
1191 // check the access_flags for the field in the klass
1192
1193 InstanceKlass* ik = entry->field_holder();
1194 int index = entry->field_index();
1195 if (!ik->field_status(index).is_access_watched()) return;
1196
1197 bool is_static = (obj == nullptr);
1198 HandleMark hm(current);
1199
1200 Handle h_obj;
1201 if (!is_static) {
1202 // non-static field accessors have an object, but we need a handle
1203 h_obj = Handle(current, obj);
1204 }
1205 InstanceKlass* field_holder = entry->field_holder(); // HERE
1206 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static);
1207 LastFrameAccessor last_frame(current);
1208 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1209 JRT_END
1210
1211 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1212 ResolvedFieldEntry *entry, jvalue *value))
1213
1214 InstanceKlass* ik = entry->field_holder();
1215
1216 // check the access_flags for the field in the klass
1217 int index = entry->field_index();
1218 // bail out if field modifications are not watched
1219 if (!ik->field_status(index).is_modification_watched()) return;
1220
1221 char sig_type = '\0';
1222
1223 switch((TosState)entry->tos_state()) {
1224 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1225 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1226 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1227 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1228 case itos: sig_type = JVM_SIGNATURE_INT; break;
1229 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1230 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1231 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1232 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1233 default: ShouldNotReachHere(); return;
1234 }
1235 bool is_static = (obj == nullptr);
1236
1237 HandleMark hm(current);
1238 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static);
1239 jvalue fvalue;
1240 #ifdef _LP64
1241 fvalue = *value;
1242 #else
1243 // Long/double values are stored unaligned and also noncontiguously with
1244 // tagged stacks. We can't just do a simple assignment even in the non-
1245 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1246 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1247 // We assume that the two halves of longs/doubles are stored in interpreter
1248 // stack slots in platform-endian order.
1249 jlong_accessor u;
1250 jint* newval = (jint*)value;
1251 u.words[0] = newval[0];
1252 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1253 fvalue.j = u.long_value;
1254 #endif // _LP64
1255
1256 Handle h_obj;
1257 if (!is_static) {
1258 // non-static field accessors have an object, but we need a handle
1259 h_obj = Handle(current, obj);
1260 }
1261
1262 LastFrameAccessor last_frame(current);
1263 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1264 fid, sig_type, &fvalue);
1265 JRT_END
1266
1267 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1268 LastFrameAccessor last_frame(current);
1269 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1270 JRT_END
1271
1272
1273 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1274 // before transitioning to VM, and restore it after transitioning back
1275 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1276 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1277 LastFrameAccessor last_frame(current);
1278 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1279 JRT_END
1280
1281 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1282 {
1283 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1284 }
1285 JRT_END
1286
1287
1288 // Implementation of SignatureHandlerLibrary
1289
1290 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1291 // Dummy definition (else normalization method is defined in CPU
1292 // dependent code)
1293 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1294 return fingerprint;
1295 }
1296 #endif
1297
1298 address SignatureHandlerLibrary::set_handler_blob() {
1299 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1300 if (handler_blob == nullptr) {
1301 return nullptr;
1302 }
1303 address handler = handler_blob->code_begin();
1304 _handler_blob = handler_blob;
1305 _handler = handler;
1306 return handler;
1307 }
1308
1309 void SignatureHandlerLibrary::initialize() {
1310 if (_fingerprints != nullptr) {
1311 return;
1312 }
1313 if (set_handler_blob() == nullptr) {
1314 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1315 }
1316
1317 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1318 SignatureHandlerLibrary::buffer_size);
1319 _buffer = bb->code_begin();
1320
1321 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1322 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1323 }
1324
1325 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1326 address handler = _handler;
1327 int insts_size = buffer->pure_insts_size();
1328 if (handler + insts_size > _handler_blob->code_end()) {
1329 // get a new handler blob
1330 handler = set_handler_blob();
1331 }
1332 if (handler != nullptr) {
1333 memcpy(handler, buffer->insts_begin(), insts_size);
1334 pd_set_handler(handler);
1335 ICache::invalidate_range(handler, insts_size);
1336 _handler = handler + insts_size;
1337 }
1338 return handler;
1339 }
1340
1341 void SignatureHandlerLibrary::add(const methodHandle& method) {
1342 if (method->signature_handler() == nullptr) {
1343 // use slow signature handler if we can't do better
1344 int handler_index = -1;
1345 // check if we can use customized (fast) signature handler
1346 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1347 // use customized signature handler
1348 MutexLocker mu(SignatureHandlerLibrary_lock);
1349 // make sure data structure is initialized
1350 initialize();
1351 // lookup method signature's fingerprint
1352 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1353 // allow CPU dependent code to optimize the fingerprints for the fast handler
1354 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1355 handler_index = _fingerprints->find(fingerprint);
1356 // create handler if necessary
1357 if (handler_index < 0) {
1358 ResourceMark rm;
1359 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1360 CodeBuffer buffer((address)(_buffer + align_offset),
1361 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1362 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1363 // copy into code heap
1364 address handler = set_handler(&buffer);
1365 if (handler == nullptr) {
1366 // use slow signature handler (without memorizing it in the fingerprints)
1367 } else {
1368 // debugging support
1369 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1370 ttyLocker ttyl;
1371 tty->cr();
1372 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1373 _handlers->length(),
1374 (method->is_static() ? "static" : "receiver"),
1375 method->name_and_sig_as_C_string(),
1376 fingerprint,
1377 buffer.insts_size());
1378 if (buffer.insts_size() > 0) {
1379 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1380 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1381 }
1382 #ifndef PRODUCT
1383 address rh_begin = Interpreter::result_handler(method()->result_type());
1384 if (CodeCache::contains(rh_begin)) {
1385 // else it might be special platform dependent values
1386 tty->print_cr(" --- associated result handler ---");
1387 address rh_end = rh_begin;
1388 while (*(int*)rh_end != 0) {
1389 rh_end += sizeof(int);
1390 }
1391 Disassembler::decode(rh_begin, rh_end);
1392 } else {
1393 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1394 }
1395 #endif
1396 }
1397 // add handler to library
1398 _fingerprints->append(fingerprint);
1399 _handlers->append(handler);
1400 // set handler index
1401 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1402 handler_index = _fingerprints->length() - 1;
1403 }
1404 }
1405 // Set handler under SignatureHandlerLibrary_lock
1406 if (handler_index < 0) {
1407 // use generic signature handler
1408 method->set_signature_handler(Interpreter::slow_signature_handler());
1409 } else {
1410 // set handler
1411 method->set_signature_handler(_handlers->at(handler_index));
1412 }
1413 } else {
1414 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1415 // use generic signature handler
1416 method->set_signature_handler(Interpreter::slow_signature_handler());
1417 }
1418 }
1419 #ifdef ASSERT
1420 int handler_index = -1;
1421 int fingerprint_index = -2;
1422 {
1423 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1424 // in any way if accessed from multiple threads. To avoid races with another
1425 // thread which may change the arrays in the above, mutex protected block, we
1426 // have to protect this read access here with the same mutex as well!
1427 MutexLocker mu(SignatureHandlerLibrary_lock);
1428 if (_handlers != nullptr) {
1429 handler_index = _handlers->find(method->signature_handler());
1430 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1431 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1432 fingerprint_index = _fingerprints->find(fingerprint);
1433 }
1434 }
1435 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1436 handler_index == fingerprint_index, "sanity check");
1437 #endif // ASSERT
1438 }
1439
1440 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1441 int handler_index = -1;
1442 // use customized signature handler
1443 MutexLocker mu(SignatureHandlerLibrary_lock);
1444 // make sure data structure is initialized
1445 initialize();
1446 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1447 handler_index = _fingerprints->find(fingerprint);
1448 // create handler if necessary
1449 if (handler_index < 0) {
1450 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1451 tty->cr();
1452 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1453 _handlers->length(),
1454 p2i(handler),
1455 fingerprint);
1456 }
1457 _fingerprints->append(fingerprint);
1458 _handlers->append(handler);
1459 } else {
1460 if (PrintSignatureHandlers) {
1461 tty->cr();
1462 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1463 _handlers->length(),
1464 fingerprint,
1465 p2i(_handlers->at(handler_index)),
1466 p2i(handler));
1467 }
1468 }
1469 }
1470
1471
1472 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1473 address SignatureHandlerLibrary::_handler = nullptr;
1474 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1475 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1476 address SignatureHandlerLibrary::_buffer = nullptr;
1477
1478
1479 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1480 methodHandle m(current, method);
1481 assert(m->is_native(), "sanity check");
1482 // lookup native function entry point if it doesn't exist
1483 if (!m->has_native_function()) {
1484 NativeLookup::lookup(m, CHECK);
1485 }
1486 // make sure signature handler is installed
1487 SignatureHandlerLibrary::add(m);
1488 // The interpreter entry point checks the signature handler first,
1489 // before trying to fetch the native entry point and klass mirror.
1490 // We must set the signature handler last, so that multiple processors
1491 // preparing the same method will be sure to see non-null entry & mirror.
1492 JRT_END
1493
1494 #if defined(IA32) || defined(AMD64) || defined(ARM)
1495 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1496 assert(current == JavaThread::current(), "pre-condition");
1497 if (src_address == dest_address) {
1498 return;
1499 }
1500 ResourceMark rm;
1501 LastFrameAccessor last_frame(current);
1502 assert(last_frame.is_interpreted_frame(), "");
1503 jint bci = last_frame.bci();
1504 methodHandle mh(current, last_frame.method());
1505 Bytecode_invoke invoke(mh, bci);
1506 ArgumentSizeComputer asc(invoke.signature());
1507 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1508 Copy::conjoint_jbytes(src_address, dest_address,
1509 size_of_arguments * Interpreter::stackElementSize);
1510 JRT_END
1511 #endif
1512
1513 #if INCLUDE_JVMTI
1514 // This is a support of the JVMTI PopFrame interface.
1515 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1516 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1517 // The member_name argument is a saved reference (in local#0) to the member_name.
1518 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1519 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1520 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1521 Method* method, address bcp))
1522 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1523 if (code != Bytecodes::_invokestatic) {
1524 return;
1525 }
1526 ConstantPool* cpool = method->constants();
1527 int cp_index = Bytes::get_native_u2(bcp + 1);
1528 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1529 Symbol* mname = cpool->name_ref_at(cp_index, code);
1530
1531 if (MethodHandles::has_member_arg(cname, mname)) {
1532 oop member_name_oop = cast_to_oop(member_name);
1533 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1534 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1535 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1536 }
1537 current->set_vm_result(member_name_oop);
1538 } else {
1539 current->set_vm_result(nullptr);
1540 }
1541 JRT_END
1542 #endif // INCLUDE_JVMTI
1543
1544 #ifndef PRODUCT
1545 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1546 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1547 // The generated code still uses call_VM because that will set up the frame pointer for
1548 // bcp and method.
1549 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1550 assert(current == JavaThread::current(), "pre-condition");
1551 LastFrameAccessor last_frame(current);
1552 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1553 methodHandle mh(current, last_frame.method());
1554 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1555 return preserve_this_value;
1556 JRT_END
1557 #endif // !PRODUCT