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 assert(LockingMode != LM_LIGHTWEIGHT, "Should call monitorenter_obj() when using the new lightweight locking");
739 #ifdef ASSERT
740 current->last_frame().interpreter_frame_verify_monitor(elem);
741 #endif
742 Handle h_obj(current, elem->obj());
743 assert(Universe::heap()->is_in_or_null(h_obj()),
744 "must be null or an object");
745 ThreadOnMonitorEnter tme(current);
746 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
747 assert(Universe::heap()->is_in_or_null(elem->obj()),
748 "must be null or an object");
749 #ifdef ASSERT
750 if (!current->preempting()) current->last_frame().interpreter_frame_verify_monitor(elem);
751 #endif
752 JRT_END
753
754 // NOTE: We provide a separate implementation for the new lightweight locking to workaround a limitation
755 // of registers in x86_32. This entry point accepts an oop instead of a BasicObjectLock*.
756 // The problem is that we would need to preserve the register that holds the BasicObjectLock,
757 // but we are using that register to hold the thread. We don't have enough registers to
758 // also keep the BasicObjectLock, but we don't really need it anyway, we only need
759 // the object. See also InterpreterMacroAssembler::lock_object().
760 // As soon as legacy stack-locking goes away we could remove the other monitorenter() entry
761 // point, and only use oop-accepting entries (same for monitorexit() below).
762 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter_obj(JavaThread* current, oopDesc* obj))
763 assert(LockingMode == LM_LIGHTWEIGHT, "Should call monitorenter() when not using the new lightweight locking");
764 Handle h_obj(current, cast_to_oop(obj));
765 assert(Universe::heap()->is_in_or_null(h_obj()),
766 "must be null or an object");
767 ThreadOnMonitorEnter tme(current);
768 ObjectSynchronizer::enter(h_obj, nullptr, current);
769 return;
770 JRT_END
771
772 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
773 oop obj = elem->obj();
774 assert(Universe::heap()->is_in(obj), "must be an object");
775 // The object could become unlocked through a JNI call, which we have no other checks for.
776 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
777 if (obj->is_unlocked()) {
778 if (CheckJNICalls) {
779 fatal("Object has been unlocked by JNI");
780 }
781 return;
782 }
783 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
784 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
785 // again at method exit or in the case of an exception.
786 elem->set_obj(nullptr);
787 JRT_END
788
789
790 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
791 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
792 JRT_END
793
794
795 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
796 // Returns an illegal exception to install into the current thread. The
797 // pending_exception flag is cleared so normal exception handling does not
798 // trigger. Any current installed exception will be overwritten. This
799 // method will be called during an exception unwind.
800
801 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
802 Handle exception(current, current->vm_result());
803 assert(exception() != nullptr, "vm result should be set");
804 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
805 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
806 current->set_vm_result(exception());
807 JRT_END
808
809
810 //------------------------------------------------------------------------------------------------------------------------
811 // Invokes
812
813 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
814 return method->orig_bytecode_at(method->bci_from(bcp));
815 JRT_END
816
817 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
818 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
819 JRT_END
820
821 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
822 JvmtiExport::post_raw_breakpoint(current, method, bcp);
823 JRT_END
824
825 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
826 LastFrameAccessor last_frame(current);
827 // extract receiver from the outgoing argument list if necessary
828 Handle receiver(current, nullptr);
829 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
830 bytecode == Bytecodes::_invokespecial) {
831 ResourceMark rm(current);
832 methodHandle m (current, last_frame.method());
833 Bytecode_invoke call(m, last_frame.bci());
834 Symbol* signature = call.signature();
835 receiver = Handle(current, last_frame.callee_receiver(signature));
836
837 assert(Universe::heap()->is_in_or_null(receiver()),
838 "sanity check");
839 assert(receiver.is_null() ||
840 !Universe::heap()->is_in(receiver->klass()),
841 "sanity check");
842 }
843
844 // resolve method
845 CallInfo info;
846 constantPoolHandle pool(current, last_frame.method()->constants());
847 ConstantPoolCache* cache = pool->cache();
848
849 methodHandle resolved_method;
850
851 int method_index = last_frame.get_index_u2(bytecode);
852 {
853 JvmtiHideSingleStepping jhss(current);
854 JavaThread* THREAD = current; // For exception macros.
855 LinkResolver::resolve_invoke(info, receiver, pool,
856 method_index, bytecode,
857 THREAD);
858
859 if (HAS_PENDING_EXCEPTION) {
860 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
861 // Preserve the original exception across the call to note_trap()
862 PreserveExceptionMark pm(current);
863 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
864 note_trap(current, Deoptimization::Reason_null_check);
865 }
866 return;
867 }
868
869 resolved_method = methodHandle(current, info.resolved_method());
870 } // end JvmtiHideSingleStepping
871
872 // Don't allow safepoints until the method is cached.
873 NoSafepointVerifier nsv;
874
875 // check if link resolution caused cpCache to be updated
876 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
877
878 #ifdef ASSERT
879 if (bytecode == Bytecodes::_invokeinterface) {
880 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
881 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
882 // (see also CallInfo::set_interface for details)
883 assert(info.call_kind() == CallInfo::vtable_call ||
884 info.call_kind() == CallInfo::direct_call, "");
885 assert(resolved_method->is_final() || info.has_vtable_index(),
886 "should have been set already");
887 } else if (!resolved_method->has_itable_index()) {
888 // Resolved something like CharSequence.toString. Use vtable not itable.
889 assert(info.call_kind() != CallInfo::itable_call, "");
890 } else {
891 // Setup itable entry
892 assert(info.call_kind() == CallInfo::itable_call, "");
893 int index = resolved_method->itable_index();
894 assert(info.itable_index() == index, "");
895 }
896 } else if (bytecode == Bytecodes::_invokespecial) {
897 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
898 } else {
899 assert(info.call_kind() == CallInfo::direct_call ||
900 info.call_kind() == CallInfo::vtable_call, "");
901 }
902 #endif
903 // Get sender and only set cpCache entry to resolved if it is not an
904 // interface. The receiver for invokespecial calls within interface
905 // methods must be checked for every call.
906 InstanceKlass* sender = pool->pool_holder();
907
908 switch (info.call_kind()) {
909 case CallInfo::direct_call:
910 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
911 break;
912 case CallInfo::vtable_call:
913 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
914 break;
915 case CallInfo::itable_call:
916 cache->set_itable_call(
917 bytecode,
918 method_index,
919 info.resolved_klass(),
920 resolved_method,
921 info.itable_index());
922 break;
923 default: ShouldNotReachHere();
924 }
925 }
926
927
928 // First time execution: Resolve symbols, create a permanent MethodType object.
929 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
930 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
931 LastFrameAccessor last_frame(current);
932
933 // resolve method
934 CallInfo info;
935 constantPoolHandle pool(current, last_frame.method()->constants());
936 int method_index = last_frame.get_index_u2(bytecode);
937 {
938 JvmtiHideSingleStepping jhss(current);
939 JavaThread* THREAD = current; // For exception macros.
940 LinkResolver::resolve_invoke(info, Handle(), pool,
941 method_index, bytecode,
942 CHECK);
943 } // end JvmtiHideSingleStepping
944
945 pool->cache()->set_method_handle(method_index, info);
946 }
947
948 // First time execution: Resolve symbols, create a permanent CallSite object.
949 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
950 LastFrameAccessor last_frame(current);
951 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
952
953 // resolve method
954 CallInfo info;
955 constantPoolHandle pool(current, last_frame.method()->constants());
956 int index = last_frame.get_index_u4(bytecode);
957 {
958 JvmtiHideSingleStepping jhss(current);
959 JavaThread* THREAD = current; // For exception macros.
960 LinkResolver::resolve_invoke(info, Handle(), pool,
961 index, bytecode, CHECK);
962 } // end JvmtiHideSingleStepping
963
964 pool->cache()->set_dynamic_call(info, pool->decode_invokedynamic_index(index));
965 }
966
967 // This function is the interface to the assembly code. It returns the resolved
968 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
969 // This function will check for redefinition!
970 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
971 switch (bytecode) {
972 case Bytecodes::_getstatic:
973 case Bytecodes::_putstatic:
974 case Bytecodes::_getfield:
975 case Bytecodes::_putfield:
976 resolve_get_put(current, bytecode);
977 break;
978 case Bytecodes::_invokevirtual:
979 case Bytecodes::_invokespecial:
980 case Bytecodes::_invokestatic:
981 case Bytecodes::_invokeinterface:
982 resolve_invoke(current, bytecode);
983 break;
984 case Bytecodes::_invokehandle:
985 resolve_invokehandle(current);
986 break;
987 case Bytecodes::_invokedynamic:
988 resolve_invokedynamic(current);
989 break;
990 default:
991 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
992 break;
993 }
994 }
995 JRT_END
996
997 //------------------------------------------------------------------------------------------------------------------------
998 // Miscellaneous
999
1000
1001 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1002 // Enable WXWrite: the function is called directly by interpreter.
1003 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1004
1005 // frequency_counter_overflow_inner can throw async exception.
1006 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1007 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1008 if (branch_bcp != nullptr && nm != nullptr) {
1009 // This was a successful request for an OSR nmethod. Because
1010 // frequency_counter_overflow_inner ends with a safepoint check,
1011 // nm could have been unloaded so look it up again. It's unsafe
1012 // to examine nm directly since it might have been freed and used
1013 // for something else.
1014 LastFrameAccessor last_frame(current);
1015 Method* method = last_frame.method();
1016 int bci = method->bci_from(last_frame.bcp());
1017 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1018 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1019 if (nm != nullptr && bs_nm != nullptr) {
1020 // in case the transition passed a safepoint we need to barrier this again
1021 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1022 nm = nullptr;
1023 }
1024 }
1025 }
1026 if (nm != nullptr && current->is_interp_only_mode()) {
1027 // Normally we never get an nm if is_interp_only_mode() is true, because
1028 // policy()->event has a check for this and won't compile the method when
1029 // true. However, it's possible for is_interp_only_mode() to become true
1030 // during the compilation. We don't want to return the nm in that case
1031 // because we want to continue to execute interpreted.
1032 nm = nullptr;
1033 }
1034 #ifndef PRODUCT
1035 if (TraceOnStackReplacement) {
1036 if (nm != nullptr) {
1037 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1038 nm->print();
1039 }
1040 }
1041 #endif
1042 return nm;
1043 }
1044
1045 JRT_ENTRY(nmethod*,
1046 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1047 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1048 // flag, in case this method triggers classloading which will call into Java.
1049 UnlockFlagSaver fs(current);
1050
1051 LastFrameAccessor last_frame(current);
1052 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1053 methodHandle method(current, last_frame.method());
1054 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1055 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1056
1057 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1058
1059 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1060 if (osr_nm != nullptr && bs_nm != nullptr) {
1061 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1062 osr_nm = nullptr;
1063 }
1064 }
1065 return osr_nm;
1066 JRT_END
1067
1068 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1069 assert(ProfileInterpreter, "must be profiling interpreter");
1070 int bci = method->bci_from(cur_bcp);
1071 MethodData* mdo = method->method_data();
1072 if (mdo == nullptr) return 0;
1073 return mdo->bci_to_di(bci);
1074 JRT_END
1075
1076 #ifdef ASSERT
1077 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1078 assert(ProfileInterpreter, "must be profiling interpreter");
1079
1080 MethodData* mdo = method->method_data();
1081 assert(mdo != nullptr, "must not be null");
1082
1083 int bci = method->bci_from(bcp);
1084
1085 address mdp2 = mdo->bci_to_dp(bci);
1086 if (mdp != mdp2) {
1087 ResourceMark rm;
1088 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1089 int current_di = mdo->dp_to_di(mdp);
1090 int expected_di = mdo->dp_to_di(mdp2);
1091 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1092 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1093 int approx_bci = -1;
1094 if (current_di >= 0) {
1095 approx_bci = mdo->data_at(current_di)->bci();
1096 }
1097 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1098 mdo->print_on(tty);
1099 method->print_codes();
1100 }
1101 assert(mdp == mdp2, "wrong mdp");
1102 JRT_END
1103 #endif // ASSERT
1104
1105 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1106 assert(ProfileInterpreter, "must be profiling interpreter");
1107 ResourceMark rm(current);
1108 LastFrameAccessor last_frame(current);
1109 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1110 MethodData* h_mdo = last_frame.method()->method_data();
1111
1112 // Grab a lock to ensure atomic access to setting the return bci and
1113 // the displacement. This can block and GC, invalidating all naked oops.
1114 MutexLocker ml(RetData_lock);
1115
1116 // ProfileData is essentially a wrapper around a derived oop, so we
1117 // need to take the lock before making any ProfileData structures.
1118 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1119 guarantee(data != nullptr, "profile data must be valid");
1120 RetData* rdata = data->as_RetData();
1121 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1122 last_frame.set_mdp(new_mdp);
1123 JRT_END
1124
1125 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1126 return Method::build_method_counters(current, m);
1127 JRT_END
1128
1129
1130 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1131 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1132 // stack traversal automatically takes care of preserving arguments for invoke, so
1133 // this is no longer needed.
1134
1135 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1136 // if this is called during a safepoint
1137
1138 if (JvmtiExport::should_post_single_step()) {
1139 // This function is called by the interpreter when single stepping. Such single
1140 // stepping could unwind a frame. Then, it is important that we process any frames
1141 // that we might return into.
1142 StackWatermarkSet::before_unwind(current);
1143
1144 // We are called during regular safepoints and when the VM is
1145 // single stepping. If any thread is marked for single stepping,
1146 // then we may have JVMTI work to do.
1147 LastFrameAccessor last_frame(current);
1148 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1149 }
1150 JRT_END
1151
1152 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1153 assert(current == JavaThread::current(), "pre-condition");
1154 // This function is called by the interpreter when the return poll found a reason
1155 // to call the VM. The reason could be that we are returning into a not yet safe
1156 // to access frame. We handle that below.
1157 // Note that this path does not check for single stepping, because we do not want
1158 // to single step when unwinding frames for an exception being thrown. Instead,
1159 // such single stepping code will use the safepoint table, which will use the
1160 // InterpreterRuntime::at_safepoint callback.
1161 StackWatermarkSet::before_unwind(current);
1162 JRT_END
1163
1164 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1165 ResolvedFieldEntry *entry))
1166
1167 // check the access_flags for the field in the klass
1168
1169 InstanceKlass* ik = entry->field_holder();
1170 int index = entry->field_index();
1171 if (!ik->field_status(index).is_access_watched()) return;
1172
1173 bool is_static = (obj == nullptr);
1174 HandleMark hm(current);
1175
1176 Handle h_obj;
1177 if (!is_static) {
1178 // non-static field accessors have an object, but we need a handle
1179 h_obj = Handle(current, obj);
1180 }
1181 InstanceKlass* field_holder = entry->field_holder(); // HERE
1182 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static);
1183 LastFrameAccessor last_frame(current);
1184 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1185 JRT_END
1186
1187 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1188 ResolvedFieldEntry *entry, jvalue *value))
1189
1190 InstanceKlass* ik = entry->field_holder();
1191
1192 // check the access_flags for the field in the klass
1193 int index = entry->field_index();
1194 // bail out if field modifications are not watched
1195 if (!ik->field_status(index).is_modification_watched()) return;
1196
1197 char sig_type = '\0';
1198
1199 switch((TosState)entry->tos_state()) {
1200 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1201 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1202 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1203 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1204 case itos: sig_type = JVM_SIGNATURE_INT; break;
1205 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1206 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1207 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1208 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1209 default: ShouldNotReachHere(); return;
1210 }
1211 bool is_static = (obj == nullptr);
1212
1213 HandleMark hm(current);
1214 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static);
1215 jvalue fvalue;
1216 #ifdef _LP64
1217 fvalue = *value;
1218 #else
1219 // Long/double values are stored unaligned and also noncontiguously with
1220 // tagged stacks. We can't just do a simple assignment even in the non-
1221 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1222 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1223 // We assume that the two halves of longs/doubles are stored in interpreter
1224 // stack slots in platform-endian order.
1225 jlong_accessor u;
1226 jint* newval = (jint*)value;
1227 u.words[0] = newval[0];
1228 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1229 fvalue.j = u.long_value;
1230 #endif // _LP64
1231
1232 Handle h_obj;
1233 if (!is_static) {
1234 // non-static field accessors have an object, but we need a handle
1235 h_obj = Handle(current, obj);
1236 }
1237
1238 LastFrameAccessor last_frame(current);
1239 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1240 fid, sig_type, &fvalue);
1241 JRT_END
1242
1243 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1244 LastFrameAccessor last_frame(current);
1245 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1246 JRT_END
1247
1248
1249 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1250 // before transitioning to VM, and restore it after transitioning back
1251 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1252 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1253 LastFrameAccessor last_frame(current);
1254 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1255 JRT_END
1256
1257 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1258 {
1259 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1260 }
1261 JRT_END
1262
1263
1264 // Implementation of SignatureHandlerLibrary
1265
1266 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1267 // Dummy definition (else normalization method is defined in CPU
1268 // dependent code)
1269 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1270 return fingerprint;
1271 }
1272 #endif
1273
1274 address SignatureHandlerLibrary::set_handler_blob() {
1275 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1276 if (handler_blob == nullptr) {
1277 return nullptr;
1278 }
1279 address handler = handler_blob->code_begin();
1280 _handler_blob = handler_blob;
1281 _handler = handler;
1282 return handler;
1283 }
1284
1285 void SignatureHandlerLibrary::initialize() {
1286 if (_fingerprints != nullptr) {
1287 return;
1288 }
1289 if (set_handler_blob() == nullptr) {
1290 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1291 }
1292
1293 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1294 SignatureHandlerLibrary::buffer_size);
1295 _buffer = bb->code_begin();
1296
1297 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1298 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1299 }
1300
1301 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1302 address handler = _handler;
1303 int insts_size = buffer->pure_insts_size();
1304 if (handler + insts_size > _handler_blob->code_end()) {
1305 // get a new handler blob
1306 handler = set_handler_blob();
1307 }
1308 if (handler != nullptr) {
1309 memcpy(handler, buffer->insts_begin(), insts_size);
1310 pd_set_handler(handler);
1311 ICache::invalidate_range(handler, insts_size);
1312 _handler = handler + insts_size;
1313 }
1314 return handler;
1315 }
1316
1317 void SignatureHandlerLibrary::add(const methodHandle& method) {
1318 if (method->signature_handler() == nullptr) {
1319 // use slow signature handler if we can't do better
1320 int handler_index = -1;
1321 // check if we can use customized (fast) signature handler
1322 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1323 // use customized signature handler
1324 MutexLocker mu(SignatureHandlerLibrary_lock);
1325 // make sure data structure is initialized
1326 initialize();
1327 // lookup method signature's fingerprint
1328 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1329 // allow CPU dependent code to optimize the fingerprints for the fast handler
1330 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1331 handler_index = _fingerprints->find(fingerprint);
1332 // create handler if necessary
1333 if (handler_index < 0) {
1334 ResourceMark rm;
1335 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1336 CodeBuffer buffer((address)(_buffer + align_offset),
1337 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1338 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1339 // copy into code heap
1340 address handler = set_handler(&buffer);
1341 if (handler == nullptr) {
1342 // use slow signature handler (without memorizing it in the fingerprints)
1343 } else {
1344 // debugging support
1345 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1346 ttyLocker ttyl;
1347 tty->cr();
1348 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1349 _handlers->length(),
1350 (method->is_static() ? "static" : "receiver"),
1351 method->name_and_sig_as_C_string(),
1352 fingerprint,
1353 buffer.insts_size());
1354 if (buffer.insts_size() > 0) {
1355 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1356 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1357 }
1358 #ifndef PRODUCT
1359 address rh_begin = Interpreter::result_handler(method()->result_type());
1360 if (CodeCache::contains(rh_begin)) {
1361 // else it might be special platform dependent values
1362 tty->print_cr(" --- associated result handler ---");
1363 address rh_end = rh_begin;
1364 while (*(int*)rh_end != 0) {
1365 rh_end += sizeof(int);
1366 }
1367 Disassembler::decode(rh_begin, rh_end);
1368 } else {
1369 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1370 }
1371 #endif
1372 }
1373 // add handler to library
1374 _fingerprints->append(fingerprint);
1375 _handlers->append(handler);
1376 // set handler index
1377 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1378 handler_index = _fingerprints->length() - 1;
1379 }
1380 }
1381 // Set handler under SignatureHandlerLibrary_lock
1382 if (handler_index < 0) {
1383 // use generic signature handler
1384 method->set_signature_handler(Interpreter::slow_signature_handler());
1385 } else {
1386 // set handler
1387 method->set_signature_handler(_handlers->at(handler_index));
1388 }
1389 } else {
1390 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1391 // use generic signature handler
1392 method->set_signature_handler(Interpreter::slow_signature_handler());
1393 }
1394 }
1395 #ifdef ASSERT
1396 int handler_index = -1;
1397 int fingerprint_index = -2;
1398 {
1399 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1400 // in any way if accessed from multiple threads. To avoid races with another
1401 // thread which may change the arrays in the above, mutex protected block, we
1402 // have to protect this read access here with the same mutex as well!
1403 MutexLocker mu(SignatureHandlerLibrary_lock);
1404 if (_handlers != nullptr) {
1405 handler_index = _handlers->find(method->signature_handler());
1406 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1407 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1408 fingerprint_index = _fingerprints->find(fingerprint);
1409 }
1410 }
1411 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1412 handler_index == fingerprint_index, "sanity check");
1413 #endif // ASSERT
1414 }
1415
1416 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1417 int handler_index = -1;
1418 // use customized signature handler
1419 MutexLocker mu(SignatureHandlerLibrary_lock);
1420 // make sure data structure is initialized
1421 initialize();
1422 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1423 handler_index = _fingerprints->find(fingerprint);
1424 // create handler if necessary
1425 if (handler_index < 0) {
1426 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1427 tty->cr();
1428 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1429 _handlers->length(),
1430 p2i(handler),
1431 fingerprint);
1432 }
1433 _fingerprints->append(fingerprint);
1434 _handlers->append(handler);
1435 } else {
1436 if (PrintSignatureHandlers) {
1437 tty->cr();
1438 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1439 _handlers->length(),
1440 fingerprint,
1441 p2i(_handlers->at(handler_index)),
1442 p2i(handler));
1443 }
1444 }
1445 }
1446
1447
1448 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1449 address SignatureHandlerLibrary::_handler = nullptr;
1450 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1451 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1452 address SignatureHandlerLibrary::_buffer = nullptr;
1453
1454
1455 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1456 methodHandle m(current, method);
1457 assert(m->is_native(), "sanity check");
1458 // lookup native function entry point if it doesn't exist
1459 if (!m->has_native_function()) {
1460 NativeLookup::lookup(m, CHECK);
1461 }
1462 // make sure signature handler is installed
1463 SignatureHandlerLibrary::add(m);
1464 // The interpreter entry point checks the signature handler first,
1465 // before trying to fetch the native entry point and klass mirror.
1466 // We must set the signature handler last, so that multiple processors
1467 // preparing the same method will be sure to see non-null entry & mirror.
1468 JRT_END
1469
1470 #if defined(IA32) || defined(AMD64) || defined(ARM)
1471 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1472 assert(current == JavaThread::current(), "pre-condition");
1473 if (src_address == dest_address) {
1474 return;
1475 }
1476 ResourceMark rm;
1477 LastFrameAccessor last_frame(current);
1478 assert(last_frame.is_interpreted_frame(), "");
1479 jint bci = last_frame.bci();
1480 methodHandle mh(current, last_frame.method());
1481 Bytecode_invoke invoke(mh, bci);
1482 ArgumentSizeComputer asc(invoke.signature());
1483 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1484 Copy::conjoint_jbytes(src_address, dest_address,
1485 size_of_arguments * Interpreter::stackElementSize);
1486 JRT_END
1487 #endif
1488
1489 #if INCLUDE_JVMTI
1490 // This is a support of the JVMTI PopFrame interface.
1491 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1492 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1493 // The member_name argument is a saved reference (in local#0) to the member_name.
1494 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1495 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1496 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1497 Method* method, address bcp))
1498 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1499 if (code != Bytecodes::_invokestatic) {
1500 return;
1501 }
1502 ConstantPool* cpool = method->constants();
1503 int cp_index = Bytes::get_native_u2(bcp + 1);
1504 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1505 Symbol* mname = cpool->name_ref_at(cp_index, code);
1506
1507 if (MethodHandles::has_member_arg(cname, mname)) {
1508 oop member_name_oop = cast_to_oop(member_name);
1509 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1510 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1511 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1512 }
1513 current->set_vm_result(member_name_oop);
1514 } else {
1515 current->set_vm_result(nullptr);
1516 }
1517 JRT_END
1518 #endif // INCLUDE_JVMTI
1519
1520 #ifndef PRODUCT
1521 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1522 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1523 // The generated code still uses call_VM because that will set up the frame pointer for
1524 // bcp and method.
1525 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1526 assert(current == JavaThread::current(), "pre-condition");
1527 LastFrameAccessor last_frame(current);
1528 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1529 methodHandle mh(current, last_frame.method());
1530 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1531 return preserve_this_value;
1532 JRT_END
1533 #endif // !PRODUCT