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.inline.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
81 // Helper class to access current interpreter state
82 class LastFrameAccessor : public StackObj {
83 frame _last_frame;
84 public:
85 LastFrameAccessor(JavaThread* current) {
86 assert(current == Thread::current(), "sanity");
87 _last_frame = current->last_frame();
88 }
89 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
90 Method* method() const { return _last_frame.interpreter_frame_method(); }
91 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
92 int bci() const { return _last_frame.interpreter_frame_bci(); }
93 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
94
95 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
96 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
97
98 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
99 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
100
101 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
102 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
103 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
104 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
105 int number_of_dimensions() const { return bcp()[3]; }
106
107 oop callee_receiver(Symbol* signature) {
108 return _last_frame.interpreter_callee_receiver(signature);
109 }
110 BasicObjectLock* monitor_begin() const {
111 return _last_frame.interpreter_frame_monitor_begin();
112 }
113 BasicObjectLock* monitor_end() const {
114 return _last_frame.interpreter_frame_monitor_end();
115 }
116 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
117 return _last_frame.next_monitor_in_interpreter_frame(current);
118 }
119
120 frame& get_frame() { return _last_frame; }
121 };
122
123 //------------------------------------------------------------------------------------------------------------------------
124 // State accessors
125
126 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
127 LastFrameAccessor last_frame(current);
128 last_frame.set_bcp(bcp);
129 if (ProfileInterpreter) {
130 // ProfileTraps uses MDOs independently of ProfileInterpreter.
131 // That is why we must check both ProfileInterpreter and mdo != nullptr.
132 MethodData* mdo = last_frame.method()->method_data();
133 if (mdo != nullptr) {
134 NEEDS_CLEANUP;
135 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
136 }
137 }
138 }
139
140 //------------------------------------------------------------------------------------------------------------------------
141 // Constants
142
143
144 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
145 // access constant pool
146 LastFrameAccessor last_frame(current);
147 ConstantPool* pool = last_frame.method()->constants();
148 int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
149 constantTag tag = pool->tag_at(cp_index);
150
151 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
152 Klass* klass = pool->klass_at(cp_index, CHECK);
153 oop java_class = klass->java_mirror();
154 current->set_vm_result(java_class);
155 JRT_END
156
157 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
158 assert(bytecode == Bytecodes::_ldc ||
159 bytecode == Bytecodes::_ldc_w ||
160 bytecode == Bytecodes::_ldc2_w ||
161 bytecode == Bytecodes::_fast_aldc ||
162 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
163 ResourceMark rm(current);
164 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
165 bytecode == Bytecodes::_fast_aldc_w);
166 LastFrameAccessor last_frame(current);
167 methodHandle m (current, last_frame.method());
168 Bytecode_loadconstant ldc(m, last_frame.bci());
169
170 // Double-check the size. (Condy can have any type.)
171 BasicType type = ldc.result_type();
172 switch (type2size[type]) {
173 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
174 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
175 default: ShouldNotReachHere();
176 }
177
178 // Resolve the constant. This does not do unboxing.
179 // But it does replace Universe::the_null_sentinel by null.
180 oop result = ldc.resolve_constant(CHECK);
181 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
182
183 #ifdef ASSERT
184 {
185 // The bytecode wrappers aren't GC-safe so construct a new one
186 Bytecode_loadconstant ldc2(m, last_frame.bci());
187 int rindex = ldc2.cache_index();
188 if (rindex < 0)
189 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
190 if (rindex >= 0) {
191 oop coop = m->constants()->resolved_reference_at(rindex);
192 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
193 assert(roop == coop, "expected result for assembly code");
194 }
195 }
196 #endif
197 current->set_vm_result(result);
198 if (!is_fast_aldc) {
199 // Tell the interpreter how to unbox the primitive.
200 guarantee(java_lang_boxing_object::is_instance(result, type), "");
201 int offset = java_lang_boxing_object::value_offset(type);
202 intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift)
203 | (offset & ConstantPoolCache::field_index_mask));
204 current->set_vm_result_2((Metadata*)flags);
205 }
206 }
207 JRT_END
208
209
210 //------------------------------------------------------------------------------------------------------------------------
211 // Allocation
212
213 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
214 Klass* k = pool->klass_at(index, CHECK);
215 InstanceKlass* klass = InstanceKlass::cast(k);
216
217 // Make sure we are not instantiating an abstract klass
218 klass->check_valid_for_instantiation(true, CHECK);
219
220 // Make sure klass is initialized
221 klass->initialize(CHECK);
222
223 oop obj = klass->allocate_instance(CHECK);
224 current->set_vm_result(obj);
225 JRT_END
226
227
228 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
229 oop obj = oopFactory::new_typeArray(type, size, CHECK);
230 current->set_vm_result(obj);
231 JRT_END
232
233
234 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
235 Klass* klass = pool->klass_at(index, CHECK);
236 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
237 current->set_vm_result(obj);
238 JRT_END
239
240
241 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
242 // We may want to pass in more arguments - could make this slightly faster
243 LastFrameAccessor last_frame(current);
244 ConstantPool* constants = last_frame.method()->constants();
245 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
246 Klass* klass = constants->klass_at(i, CHECK);
247 int nof_dims = last_frame.number_of_dimensions();
248 assert(klass->is_klass(), "not a class");
249 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
250
251 // We must create an array of jints to pass to multi_allocate.
252 ResourceMark rm(current);
253 const int small_dims = 10;
254 jint dim_array[small_dims];
255 jint *dims = &dim_array[0];
256 if (nof_dims > small_dims) {
257 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
258 }
259 for (int index = 0; index < nof_dims; index++) {
260 // offset from first_size_address is addressed as local[index]
261 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
262 dims[index] = first_size_address[n];
263 }
264 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
265 current->set_vm_result(obj);
266 JRT_END
267
268
269 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
270 assert(oopDesc::is_oop(obj), "must be a valid oop");
271 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
272 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
273 JRT_END
274
275
276 // Quicken instance-of and check-cast bytecodes
277 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
278 // Force resolving; quicken the bytecode
279 LastFrameAccessor last_frame(current);
280 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
281 ConstantPool* cpool = last_frame.method()->constants();
282 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
283 // program we might have seen an unquick'd bytecode in the interpreter but have another
284 // thread quicken the bytecode before we get here.
285 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
286 Klass* klass = cpool->klass_at(which, CHECK);
287 current->set_vm_result_2(klass);
288 JRT_END
289
290
291 //------------------------------------------------------------------------------------------------------------------------
292 // Exceptions
293
294 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
295 const methodHandle& trap_method, int trap_bci) {
296 if (trap_method.not_null()) {
297 MethodData* trap_mdo = trap_method->method_data();
298 if (trap_mdo == nullptr) {
299 ExceptionMark em(current);
300 JavaThread* THREAD = current; // For exception macros.
301 Method::build_profiling_method_data(trap_method, THREAD);
302 if (HAS_PENDING_EXCEPTION) {
303 // Only metaspace OOM is expected. No Java code executed.
304 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
305 "we expect only an OOM error here");
306 CLEAR_PENDING_EXCEPTION;
307 }
308 trap_mdo = trap_method->method_data();
309 // and fall through...
310 }
311 if (trap_mdo != nullptr) {
312 // Update per-method count of trap events. The interpreter
313 // is updating the MDO to simulate the effect of compiler traps.
314 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
315 }
316 }
317 }
318
319 // Assume the compiler is (or will be) interested in this event.
320 // If necessary, create an MDO to hold the information, and record it.
321 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
322 assert(ProfileTraps, "call me only if profiling");
323 LastFrameAccessor last_frame(current);
324 methodHandle trap_method(current, last_frame.method());
325 int trap_bci = trap_method->bci_from(last_frame.bcp());
326 note_trap_inner(current, reason, trap_method, trap_bci);
327 }
328
329 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
330 // get klass
331 InstanceKlass* klass = InstanceKlass::cast(k);
332 assert(klass->is_initialized(),
333 "this klass should have been initialized during VM initialization");
334 // create instance - do not call constructor since we may have no
335 // (java) stack space left (should assert constructor is empty)
336 Handle exception;
337 oop exception_oop = klass->allocate_instance(CHECK_(exception));
338 exception = Handle(THREAD, exception_oop);
339 if (StackTraceInThrowable) {
340 java_lang_Throwable::fill_in_stack_trace(exception);
341 }
342 return exception;
343 }
344
345 // Special handling for stack overflow: since we don't have any (java) stack
346 // space left we use the pre-allocated & pre-initialized StackOverflowError
347 // klass to create an stack overflow error instance. We do not call its
348 // constructor for the same reason (it is empty, anyway).
349 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
350 Handle exception = get_preinitialized_exception(
351 vmClasses::StackOverflowError_klass(),
352 CHECK);
353 // Increment counter for hs_err file reporting
354 Atomic::inc(&Exceptions::_stack_overflow_errors);
355 // Remove the ScopedValue bindings in case we got a StackOverflowError
356 // while we were trying to manipulate ScopedValue bindings.
357 current->clear_scopedValueBindings();
358 THROW_HANDLE(exception);
359 JRT_END
360
361 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
362 Handle exception = get_preinitialized_exception(
363 vmClasses::StackOverflowError_klass(),
364 CHECK);
365 java_lang_Throwable::set_message(exception(),
366 Universe::delayed_stack_overflow_error_message());
367 // Increment counter for hs_err file reporting
368 Atomic::inc(&Exceptions::_stack_overflow_errors);
369 // Remove the ScopedValue bindings in case we got a StackOverflowError
370 // while we were trying to manipulate ScopedValue bindings.
371 current->clear_scopedValueBindings();
372 THROW_HANDLE(exception);
373 JRT_END
374
375 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
376 // lookup exception klass
377 TempNewSymbol s = SymbolTable::new_symbol(name);
378 if (ProfileTraps) {
379 if (s == vmSymbols::java_lang_ArithmeticException()) {
380 note_trap(current, Deoptimization::Reason_div0_check);
381 } else if (s == vmSymbols::java_lang_NullPointerException()) {
382 note_trap(current, Deoptimization::Reason_null_check);
383 }
384 }
385 // create exception
386 Handle exception = Exceptions::new_exception(current, s, message);
387 current->set_vm_result(exception());
388 JRT_END
389
390
391 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
392 // Produce the error message first because note_trap can safepoint
393 ResourceMark rm(current);
394 const char* klass_name = obj->klass()->external_name();
395 // lookup exception klass
396 TempNewSymbol s = SymbolTable::new_symbol(name);
397 if (ProfileTraps) {
398 if (s == vmSymbols::java_lang_ArrayStoreException()) {
399 note_trap(current, Deoptimization::Reason_array_check);
400 } else {
401 note_trap(current, Deoptimization::Reason_class_check);
402 }
403 }
404 // create exception, with klass name as detail message
405 Handle exception = Exceptions::new_exception(current, s, klass_name);
406 current->set_vm_result(exception());
407 JRT_END
408
409 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
410 // Produce the error message first because note_trap can safepoint
411 ResourceMark rm(current);
412 stringStream ss;
413 ss.print("Index %d out of bounds for length %d", index, a->length());
414
415 if (ProfileTraps) {
416 note_trap(current, Deoptimization::Reason_range_check);
417 }
418
419 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
420 JRT_END
421
422 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
423 JavaThread* current, oopDesc* obj))
424
425 // Produce the error message first because note_trap can safepoint
426 ResourceMark rm(current);
427 char* message = SharedRuntime::generate_class_cast_message(
428 current, obj->klass());
429
430 if (ProfileTraps) {
431 note_trap(current, Deoptimization::Reason_class_check);
432 }
433
434 // create exception
435 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
436 JRT_END
437
438 // exception_handler_for_exception(...) returns the continuation address,
439 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
440 // The exception oop is returned to make sure it is preserved over GC (it
441 // is only on the stack if the exception was thrown explicitly via athrow).
442 // During this operation, the expression stack contains the values for the
443 // bci where the exception happened. If the exception was propagated back
444 // from a call, the expression stack contains the values for the bci at the
445 // invoke w/o arguments (i.e., as if one were inside the call).
446 // Note that the implementation of this method assumes it's only called when an exception has actually occured
447 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
448 // We get here after we have unwound from a callee throwing an exception
449 // into the interpreter. Any deferred stack processing is notified of
450 // the event via the StackWatermarkSet.
451 StackWatermarkSet::after_unwind(current);
452
453 LastFrameAccessor last_frame(current);
454 Handle h_exception(current, exception);
455 methodHandle h_method (current, last_frame.method());
456 constantPoolHandle h_constants(current, h_method->constants());
457 bool should_repeat;
458 int handler_bci;
459 int current_bci = last_frame.bci();
460
461 if (current->frames_to_pop_failed_realloc() > 0) {
462 // Allocation of scalar replaced object used in this frame
463 // failed. Unconditionally pop the frame.
464 current->dec_frames_to_pop_failed_realloc();
465 current->set_vm_result(h_exception());
466 // If the method is synchronized we already unlocked the monitor
467 // during deoptimization so the interpreter needs to skip it when
468 // the frame is popped.
469 current->set_do_not_unlock_if_synchronized(true);
470 return Interpreter::remove_activation_entry();
471 }
472
473 // Need to do this check first since when _do_not_unlock_if_synchronized
474 // is set, we don't want to trigger any classloading which may make calls
475 // into java, or surprisingly find a matching exception handler for bci 0
476 // since at this moment the method hasn't been "officially" entered yet.
477 if (current->do_not_unlock_if_synchronized()) {
478 ResourceMark rm;
479 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
480 current->set_vm_result(exception);
481 return Interpreter::remove_activation_entry();
482 }
483
484 do {
485 should_repeat = false;
486
487 // assertions
488 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
489 // Check that exception is a subclass of Throwable.
490 assert(h_exception->is_a(vmClasses::Throwable_klass()),
491 "Exception not subclass of Throwable");
492
493 // tracing
494 if (log_is_enabled(Info, exceptions)) {
495 ResourceMark rm(current);
496 stringStream tempst;
497 tempst.print("interpreter method <%s>\n"
498 " at bci %d for thread " INTPTR_FORMAT " (%s)",
499 h_method->print_value_string(), current_bci, p2i(current), current->name());
500 Exceptions::log_exception(h_exception, tempst.as_string());
501 }
502 // Don't go paging in something which won't be used.
503 // else if (extable->length() == 0) {
504 // // disabled for now - interpreter is not using shortcut yet
505 // // (shortcut is not to call runtime if we have no exception handlers)
506 // // warning("performance bug: should not call runtime if method has no exception handlers");
507 // }
508 // for AbortVMOnException flag
509 Exceptions::debug_check_abort(h_exception);
510
511 // exception handler lookup
512 Klass* klass = h_exception->klass();
513 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
514 if (HAS_PENDING_EXCEPTION) {
515 // We threw an exception while trying to find the exception handler.
516 // Transfer the new exception to the exception handle which will
517 // be set into thread local storage, and do another lookup for an
518 // exception handler for this exception, this time starting at the
519 // BCI of the exception handler which caused the exception to be
520 // thrown (bug 4307310).
521 h_exception = Handle(THREAD, PENDING_EXCEPTION);
522 CLEAR_PENDING_EXCEPTION;
523 if (handler_bci >= 0) {
524 current_bci = handler_bci;
525 should_repeat = true;
526 }
527 }
528 } while (should_repeat == true);
529
530 #if INCLUDE_JVMCI
531 if (EnableJVMCI && h_method->method_data() != nullptr) {
532 ResourceMark rm(current);
533 MethodData* mdo = h_method->method_data();
534
535 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
536 MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
537
538 ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
539 if (pdata != nullptr && pdata->is_BitData()) {
540 BitData* bit_data = (BitData*) pdata;
541 bit_data->set_exception_seen();
542 }
543 }
544 #endif
545
546 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
547 // time throw or a stack unwinding throw and accordingly notify the debugger
548 if (JvmtiExport::can_post_on_exceptions()) {
549 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
550 }
551
552 address continuation = nullptr;
553 address handler_pc = nullptr;
554 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
555 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
556 // handler in this method, or (b) after a stack overflow there is not yet
557 // enough stack space available to reprotect the stack.
558 continuation = Interpreter::remove_activation_entry();
559 #if COMPILER2_OR_JVMCI
560 // Count this for compilation purposes
561 h_method->interpreter_throwout_increment(THREAD);
562 #endif
563 } else {
564 // handler in this method => change bci/bcp to handler bci/bcp and continue there
565 handler_pc = h_method->code_base() + handler_bci;
566 h_method->set_exception_handler_entered(handler_bci); // profiling
567 #ifndef ZERO
568 set_bcp_and_mdp(handler_pc, current);
569 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
570 #else
571 continuation = (address)(intptr_t) handler_bci;
572 #endif
573 }
574
575 // notify debugger of an exception catch
576 // (this is good for exceptions caught in native methods as well)
577 if (JvmtiExport::can_post_on_exceptions()) {
578 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
579 }
580
581 current->set_vm_result(h_exception());
582 return continuation;
583 JRT_END
584
585
586 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
587 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
588 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
589 JRT_END
590
591
592 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
593 THROW(vmSymbols::java_lang_AbstractMethodError());
594 JRT_END
595
596 // This method is called from the "abstract_entry" of the interpreter.
597 // At that point, the arguments have already been removed from the stack
598 // and therefore we don't have the receiver object at our fingertips. (Though,
599 // on some platforms the receiver still resides in a register...). Thus,
600 // we have no choice but print an error message not containing the receiver
601 // type.
602 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
603 Method* missingMethod))
604 ResourceMark rm(current);
605 assert(missingMethod != nullptr, "sanity");
606 methodHandle m(current, missingMethod);
607 LinkResolver::throw_abstract_method_error(m, THREAD);
608 JRT_END
609
610 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
611 Klass* recvKlass,
612 Method* missingMethod))
613 ResourceMark rm(current);
614 methodHandle mh = methodHandle(current, missingMethod);
615 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
616 JRT_END
617
618
619 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
620 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
621 JRT_END
622
623 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
624 Klass* recvKlass,
625 Klass* interfaceKlass))
626 ResourceMark rm(current);
627 char buf[1000];
628 buf[0] = '\0';
629 jio_snprintf(buf, sizeof(buf),
630 "Class %s does not implement the requested interface %s",
631 recvKlass ? recvKlass->external_name() : "nullptr",
632 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
633 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
634 JRT_END
635
636 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
637 THROW(vmSymbols::java_lang_NullPointerException());
638 JRT_END
639
640 //------------------------------------------------------------------------------------------------------------------------
641 // Fields
642 //
643
644 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
645 LastFrameAccessor last_frame(current);
646 constantPoolHandle pool(current, last_frame.method()->constants());
647 methodHandle m(current, last_frame.method());
648
649 resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, true /*initialize_holder*/, current);
650 }
651
652 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
653 methodHandle& m,
654 constantPoolHandle& pool,
655 bool initialize_holder, TRAPS) {
656 fieldDescriptor info;
657 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
658 bytecode == Bytecodes::_putstatic);
659 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
660
661 {
662 JvmtiHideSingleStepping jhss(THREAD);
663 LinkResolver::resolve_field_access(info, pool, field_index,
664 m, bytecode, initialize_holder, CHECK);
665 } // end JvmtiHideSingleStepping
666
667 // check if link resolution caused cpCache to be updated
668 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
669
670 // compute auxiliary field attributes
671 TosState state = as_TosState(info.field_type());
672
673 // Resolution of put instructions on final fields is delayed. That is required so that
674 // exceptions are thrown at the correct place (when the instruction is actually invoked).
675 // If we do not resolve an instruction in the current pass, leaving the put_code
676 // set to zero will cause the next put instruction to the same field to reresolve.
677
678 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
679 // to final instance fields with updates originating from a method different than <init>)
680 // is inhibited. A putfield instruction targeting an instance final field must throw
681 // an IllegalAccessError if the instruction is not in an instance
682 // initializer method <init>. If resolution were not inhibited, a putfield
683 // in an initializer method could be resolved in the initializer. Subsequent
684 // putfield instructions to the same field would then use cached information.
685 // As a result, those instructions would not pass through the VM. That is,
686 // checks in resolve_field_access() would not be executed for those instructions
687 // and the required IllegalAccessError would not be thrown.
688 //
689 // Also, we need to delay resolving getstatic and putstatic instructions until the
690 // class is initialized. This is required so that access to the static
691 // field will call the initialization function every time until the class
692 // is completely initialized ala. in 2.17.5 in JVM Specification.
693 InstanceKlass* klass = info.field_holder();
694 bool uninitialized_static = is_static && !klass->is_initialized();
695 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
696 info.has_initialized_final_update();
697 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
698
699 Bytecodes::Code get_code = (Bytecodes::Code)0;
700 Bytecodes::Code put_code = (Bytecodes::Code)0;
701 if (!uninitialized_static) {
702 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
703 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
704 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
705 }
706 }
707
708 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
709 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile());
710 entry->fill_in(info.field_holder(), info.offset(),
711 checked_cast<u2>(info.index()), checked_cast<u1>(state),
712 static_cast<u1>(get_code), static_cast<u1>(put_code));
713 }
714
715
716 //------------------------------------------------------------------------------------------------------------------------
717 // Synchronization
718 //
719 // The interpreter's synchronization code is factored out so that it can
720 // be shared by method invocation and synchronized blocks.
721 //%note synchronization_3
722
723 //%note monitor_1
724 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
725 #ifdef ASSERT
726 current->last_frame().interpreter_frame_verify_monitor(elem);
727 #endif
728 Handle h_obj(current, elem->obj());
729 assert(Universe::heap()->is_in_or_null(h_obj()),
730 "must be null or an object");
731 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
732 assert(Universe::heap()->is_in_or_null(elem->obj()),
733 "must be null or an object");
734 #ifdef ASSERT
735 if (!current->preempting()) current->last_frame().interpreter_frame_verify_monitor(elem);
736 #endif
737 JRT_END
738
739 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
740 oop obj = elem->obj();
741 assert(Universe::heap()->is_in(obj), "must be an object");
742 // The object could become unlocked through a JNI call, which we have no other checks for.
743 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
744 if (obj->is_unlocked()) {
745 if (CheckJNICalls) {
746 fatal("Object has been unlocked by JNI");
747 }
748 return;
749 }
750 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
751 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
752 // again at method exit or in the case of an exception.
753 elem->set_obj(nullptr);
754 JRT_END
755
756
757 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
758 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
759 JRT_END
760
761
762 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
763 // Returns an illegal exception to install into the current thread. The
764 // pending_exception flag is cleared so normal exception handling does not
765 // trigger. Any current installed exception will be overwritten. This
766 // method will be called during an exception unwind.
767
768 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
769 Handle exception(current, current->vm_result());
770 assert(exception() != nullptr, "vm result should be set");
771 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
772 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
773 current->set_vm_result(exception());
774 JRT_END
775
776
777 //------------------------------------------------------------------------------------------------------------------------
778 // Invokes
779
780 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
781 return method->orig_bytecode_at(method->bci_from(bcp));
782 JRT_END
783
784 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
785 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
786 JRT_END
787
788 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
789 JvmtiExport::post_raw_breakpoint(current, method, bcp);
790 JRT_END
791
792 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
793 LastFrameAccessor last_frame(current);
794 // extract receiver from the outgoing argument list if necessary
795 Handle receiver(current, nullptr);
796 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
797 bytecode == Bytecodes::_invokespecial) {
798 ResourceMark rm(current);
799 methodHandle m (current, last_frame.method());
800 Bytecode_invoke call(m, last_frame.bci());
801 Symbol* signature = call.signature();
802 receiver = Handle(current, last_frame.callee_receiver(signature));
803
804 assert(Universe::heap()->is_in_or_null(receiver()),
805 "sanity check");
806 assert(receiver.is_null() ||
807 !Universe::heap()->is_in(receiver->klass()),
808 "sanity check");
809 }
810
811 // resolve method
812 CallInfo info;
813 constantPoolHandle pool(current, last_frame.method()->constants());
814
815 methodHandle resolved_method;
816
817 int method_index = last_frame.get_index_u2(bytecode);
818 {
819 JvmtiHideSingleStepping jhss(current);
820 JavaThread* THREAD = current; // For exception macros.
821 LinkResolver::resolve_invoke(info, receiver, pool,
822 method_index, bytecode,
823 THREAD);
824
825 if (HAS_PENDING_EXCEPTION) {
826 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
827 // Preserve the original exception across the call to note_trap()
828 PreserveExceptionMark pm(current);
829 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
830 note_trap(current, Deoptimization::Reason_null_check);
831 }
832 return;
833 }
834
835 resolved_method = methodHandle(current, info.resolved_method());
836 } // end JvmtiHideSingleStepping
837
838 update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
839 }
840
841 void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
842 methodHandle& resolved_method,
843 constantPoolHandle& pool,
844 int method_index) {
845 // Don't allow safepoints until the method is cached.
846 NoSafepointVerifier nsv;
847
848 // check if link resolution caused cpCache to be updated
849 ConstantPoolCache* cache = pool->cache();
850 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
851
852 #ifdef ASSERT
853 if (bytecode == Bytecodes::_invokeinterface) {
854 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
855 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
856 // (see also CallInfo::set_interface for details)
857 assert(info.call_kind() == CallInfo::vtable_call ||
858 info.call_kind() == CallInfo::direct_call, "");
859 assert(resolved_method->is_final() || info.has_vtable_index(),
860 "should have been set already");
861 } else if (!resolved_method->has_itable_index()) {
862 // Resolved something like CharSequence.toString. Use vtable not itable.
863 assert(info.call_kind() != CallInfo::itable_call, "");
864 } else {
865 // Setup itable entry
866 assert(info.call_kind() == CallInfo::itable_call, "");
867 int index = resolved_method->itable_index();
868 assert(info.itable_index() == index, "");
869 }
870 } else if (bytecode == Bytecodes::_invokespecial) {
871 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
872 } else {
873 assert(info.call_kind() == CallInfo::direct_call ||
874 info.call_kind() == CallInfo::vtable_call, "");
875 }
876 #endif
877 // Get sender and only set cpCache entry to resolved if it is not an
878 // interface. The receiver for invokespecial calls within interface
879 // methods must be checked for every call.
880 InstanceKlass* sender = pool->pool_holder();
881
882 switch (info.call_kind()) {
883 case CallInfo::direct_call:
884 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
885 break;
886 case CallInfo::vtable_call:
887 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
888 break;
889 case CallInfo::itable_call:
890 cache->set_itable_call(
891 bytecode,
892 method_index,
893 info.resolved_klass(),
894 resolved_method,
895 info.itable_index());
896 break;
897 default: ShouldNotReachHere();
898 }
899 }
900
901 void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
902 constantPoolHandle& pool, TRAPS) {
903 LinkInfo link_info(pool, method_index, bytecode, CHECK);
904
905 if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
906 CallInfo call_info;
907 switch (bytecode) {
908 case Bytecodes::_invokevirtual: LinkResolver::cds_resolve_virtual_call (call_info, link_info, CHECK); break;
909 case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
910 case Bytecodes::_invokespecial: LinkResolver::cds_resolve_special_call (call_info, link_info, CHECK); break;
911
912 default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
913 }
914 methodHandle resolved_method(THREAD, call_info.resolved_method());
915 guarantee(resolved_method->method_holder()->is_linked(), "");
916 update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
917 } else {
918 // FIXME: why a shared class is not linked yet?
919 // Can't link it here since there are no guarantees it'll be prelinked on the next run.
920 ResourceMark rm;
921 InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
922 log_info(cds, resolve)("Not resolved: class not linked: %s %s %s",
923 resolved_iklass->is_shared() ? "is_shared" : "",
924 resolved_iklass->init_state_name(),
925 resolved_iklass->external_name());
926 }
927 }
928
929 // First time execution: Resolve symbols, create a permanent MethodType object.
930 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
931 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
932 LastFrameAccessor last_frame(current);
933
934 // resolve method
935 CallInfo info;
936 constantPoolHandle pool(current, last_frame.method()->constants());
937 int method_index = last_frame.get_index_u2(bytecode);
938 {
939 JvmtiHideSingleStepping jhss(current);
940 JavaThread* THREAD = current; // For exception macros.
941 LinkResolver::resolve_invoke(info, Handle(), pool,
942 method_index, bytecode,
943 CHECK);
944 } // end JvmtiHideSingleStepping
945
946 pool->cache()->set_method_handle(method_index, info);
947 }
948
949 void InterpreterRuntime::cds_resolve_invokehandle(int raw_index,
950 constantPoolHandle& pool, TRAPS) {
951 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
952 CallInfo info;
953 LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
954
955 pool->cache()->set_method_handle(raw_index, info);
956 }
957
958 // First time execution: Resolve symbols, create a permanent CallSite object.
959 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
960 LastFrameAccessor last_frame(current);
961 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
962
963 // resolve method
964 CallInfo info;
965 constantPoolHandle pool(current, last_frame.method()->constants());
966 int index = last_frame.get_index_u4(bytecode);
967 {
968 JvmtiHideSingleStepping jhss(current);
969 JavaThread* THREAD = current; // For exception macros.
970 LinkResolver::resolve_invoke(info, Handle(), pool,
971 index, bytecode, CHECK);
972 } // end JvmtiHideSingleStepping
973
974 pool->cache()->set_dynamic_call(info, index);
975 }
976
977 void InterpreterRuntime::cds_resolve_invokedynamic(int raw_index,
978 constantPoolHandle& pool, TRAPS) {
979 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
980 CallInfo info;
981 LinkResolver::resolve_invoke(info, Handle(), pool, raw_index, bytecode, CHECK);
982 pool->cache()->set_dynamic_call(info, raw_index);
983 }
984
985 // This function is the interface to the assembly code. It returns the resolved
986 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
987 // This function will check for redefinition!
988 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
989 switch (bytecode) {
990 case Bytecodes::_getstatic:
991 case Bytecodes::_putstatic:
992 case Bytecodes::_getfield:
993 case Bytecodes::_putfield:
994 resolve_get_put(current, bytecode);
995 break;
996 case Bytecodes::_invokevirtual:
997 case Bytecodes::_invokespecial:
998 case Bytecodes::_invokestatic:
999 case Bytecodes::_invokeinterface:
1000 resolve_invoke(current, bytecode);
1001 break;
1002 case Bytecodes::_invokehandle:
1003 resolve_invokehandle(current);
1004 break;
1005 case Bytecodes::_invokedynamic:
1006 resolve_invokedynamic(current);
1007 break;
1008 default:
1009 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1010 break;
1011 }
1012 }
1013 JRT_END
1014
1015 //------------------------------------------------------------------------------------------------------------------------
1016 // Miscellaneous
1017
1018
1019 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1020 // Enable WXWrite: the function is called directly by interpreter.
1021 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1022
1023 // frequency_counter_overflow_inner can throw async exception.
1024 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1025 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1026 if (branch_bcp != nullptr && nm != nullptr) {
1027 // This was a successful request for an OSR nmethod. Because
1028 // frequency_counter_overflow_inner ends with a safepoint check,
1029 // nm could have been unloaded so look it up again. It's unsafe
1030 // to examine nm directly since it might have been freed and used
1031 // for something else.
1032 LastFrameAccessor last_frame(current);
1033 Method* method = last_frame.method();
1034 int bci = method->bci_from(last_frame.bcp());
1035 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1036 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1037 if (nm != nullptr && bs_nm != nullptr) {
1038 // in case the transition passed a safepoint we need to barrier this again
1039 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1040 nm = nullptr;
1041 }
1042 }
1043 }
1044 if (nm != nullptr && current->is_interp_only_mode()) {
1045 // Normally we never get an nm if is_interp_only_mode() is true, because
1046 // policy()->event has a check for this and won't compile the method when
1047 // true. However, it's possible for is_interp_only_mode() to become true
1048 // during the compilation. We don't want to return the nm in that case
1049 // because we want to continue to execute interpreted.
1050 nm = nullptr;
1051 }
1052 #ifndef PRODUCT
1053 if (TraceOnStackReplacement) {
1054 if (nm != nullptr) {
1055 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1056 nm->print();
1057 }
1058 }
1059 #endif
1060 return nm;
1061 }
1062
1063 JRT_ENTRY(nmethod*,
1064 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1065 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1066 // flag, in case this method triggers classloading which will call into Java.
1067 UnlockFlagSaver fs(current);
1068
1069 LastFrameAccessor last_frame(current);
1070 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1071 methodHandle method(current, last_frame.method());
1072 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1073 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1074
1075 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1076
1077 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1078 if (osr_nm != nullptr && bs_nm != nullptr) {
1079 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1080 osr_nm = nullptr;
1081 }
1082 }
1083 return osr_nm;
1084 JRT_END
1085
1086 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1087 assert(ProfileInterpreter, "must be profiling interpreter");
1088 int bci = method->bci_from(cur_bcp);
1089 MethodData* mdo = method->method_data();
1090 if (mdo == nullptr) return 0;
1091 return mdo->bci_to_di(bci);
1092 JRT_END
1093
1094 #ifdef ASSERT
1095 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1096 assert(ProfileInterpreter, "must be profiling interpreter");
1097
1098 MethodData* mdo = method->method_data();
1099 assert(mdo != nullptr, "must not be null");
1100
1101 int bci = method->bci_from(bcp);
1102
1103 address mdp2 = mdo->bci_to_dp(bci);
1104 if (mdp != mdp2) {
1105 ResourceMark rm;
1106 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1107 int current_di = mdo->dp_to_di(mdp);
1108 int expected_di = mdo->dp_to_di(mdp2);
1109 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1110 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1111 int approx_bci = -1;
1112 if (current_di >= 0) {
1113 approx_bci = mdo->data_at(current_di)->bci();
1114 }
1115 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1116 mdo->print_on(tty);
1117 method->print_codes();
1118 }
1119 assert(mdp == mdp2, "wrong mdp");
1120 JRT_END
1121 #endif // ASSERT
1122
1123 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1124 assert(ProfileInterpreter, "must be profiling interpreter");
1125 ResourceMark rm(current);
1126 LastFrameAccessor last_frame(current);
1127 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1128 MethodData* h_mdo = last_frame.method()->method_data();
1129
1130 // Grab a lock to ensure atomic access to setting the return bci and
1131 // the displacement. This can block and GC, invalidating all naked oops.
1132 MutexLocker ml(RetData_lock);
1133
1134 // ProfileData is essentially a wrapper around a derived oop, so we
1135 // need to take the lock before making any ProfileData structures.
1136 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1137 guarantee(data != nullptr, "profile data must be valid");
1138 RetData* rdata = data->as_RetData();
1139 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1140 last_frame.set_mdp(new_mdp);
1141 JRT_END
1142
1143 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1144 return Method::build_method_counters(current, m);
1145 JRT_END
1146
1147
1148 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1149 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1150 // stack traversal automatically takes care of preserving arguments for invoke, so
1151 // this is no longer needed.
1152
1153 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1154 // if this is called during a safepoint
1155
1156 if (JvmtiExport::should_post_single_step()) {
1157 // This function is called by the interpreter when single stepping. Such single
1158 // stepping could unwind a frame. Then, it is important that we process any frames
1159 // that we might return into.
1160 StackWatermarkSet::before_unwind(current);
1161
1162 // We are called during regular safepoints and when the VM is
1163 // single stepping. If any thread is marked for single stepping,
1164 // then we may have JVMTI work to do.
1165 LastFrameAccessor last_frame(current);
1166 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1167 }
1168 JRT_END
1169
1170 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1171 assert(current == JavaThread::current(), "pre-condition");
1172 // This function is called by the interpreter when the return poll found a reason
1173 // to call the VM. The reason could be that we are returning into a not yet safe
1174 // to access frame. We handle that below.
1175 // Note that this path does not check for single stepping, because we do not want
1176 // to single step when unwinding frames for an exception being thrown. Instead,
1177 // such single stepping code will use the safepoint table, which will use the
1178 // InterpreterRuntime::at_safepoint callback.
1179 StackWatermarkSet::before_unwind(current);
1180 JRT_END
1181
1182 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1183 ResolvedFieldEntry *entry))
1184
1185 // check the access_flags for the field in the klass
1186
1187 InstanceKlass* ik = entry->field_holder();
1188 int index = entry->field_index();
1189 if (!ik->field_status(index).is_access_watched()) return;
1190
1191 bool is_static = (obj == nullptr);
1192 HandleMark hm(current);
1193
1194 Handle h_obj;
1195 if (!is_static) {
1196 // non-static field accessors have an object, but we need a handle
1197 h_obj = Handle(current, obj);
1198 }
1199 InstanceKlass* field_holder = entry->field_holder(); // HERE
1200 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static);
1201 LastFrameAccessor last_frame(current);
1202 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1203 JRT_END
1204
1205 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1206 ResolvedFieldEntry *entry, jvalue *value))
1207
1208 InstanceKlass* ik = entry->field_holder();
1209
1210 // check the access_flags for the field in the klass
1211 int index = entry->field_index();
1212 // bail out if field modifications are not watched
1213 if (!ik->field_status(index).is_modification_watched()) return;
1214
1215 char sig_type = '\0';
1216
1217 switch((TosState)entry->tos_state()) {
1218 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1219 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1220 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1221 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1222 case itos: sig_type = JVM_SIGNATURE_INT; break;
1223 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1224 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1225 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1226 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1227 default: ShouldNotReachHere(); return;
1228 }
1229 bool is_static = (obj == nullptr);
1230
1231 HandleMark hm(current);
1232 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static);
1233 jvalue fvalue;
1234 #ifdef _LP64
1235 fvalue = *value;
1236 #else
1237 // Long/double values are stored unaligned and also noncontiguously with
1238 // tagged stacks. We can't just do a simple assignment even in the non-
1239 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1240 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1241 // We assume that the two halves of longs/doubles are stored in interpreter
1242 // stack slots in platform-endian order.
1243 jlong_accessor u;
1244 jint* newval = (jint*)value;
1245 u.words[0] = newval[0];
1246 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1247 fvalue.j = u.long_value;
1248 #endif // _LP64
1249
1250 Handle h_obj;
1251 if (!is_static) {
1252 // non-static field accessors have an object, but we need a handle
1253 h_obj = Handle(current, obj);
1254 }
1255
1256 LastFrameAccessor last_frame(current);
1257 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1258 fid, sig_type, &fvalue);
1259 JRT_END
1260
1261 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1262 LastFrameAccessor last_frame(current);
1263 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1264 JRT_END
1265
1266
1267 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1268 // before transitioning to VM, and restore it after transitioning back
1269 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1270 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1271 LastFrameAccessor last_frame(current);
1272 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1273 JRT_END
1274
1275 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1276 {
1277 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1278 }
1279 JRT_END
1280
1281
1282 // Implementation of SignatureHandlerLibrary
1283
1284 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1285 // Dummy definition (else normalization method is defined in CPU
1286 // dependent code)
1287 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1288 return fingerprint;
1289 }
1290 #endif
1291
1292 address SignatureHandlerLibrary::set_handler_blob() {
1293 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1294 if (handler_blob == nullptr) {
1295 return nullptr;
1296 }
1297 address handler = handler_blob->code_begin();
1298 _handler_blob = handler_blob;
1299 _handler = handler;
1300 return handler;
1301 }
1302
1303 void SignatureHandlerLibrary::initialize() {
1304 if (_fingerprints != nullptr) {
1305 return;
1306 }
1307 if (set_handler_blob() == nullptr) {
1308 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1309 }
1310
1311 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1312 SignatureHandlerLibrary::buffer_size);
1313 _buffer = bb->code_begin();
1314
1315 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1316 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1317 }
1318
1319 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1320 address handler = _handler;
1321 int insts_size = buffer->pure_insts_size();
1322 if (handler + insts_size > _handler_blob->code_end()) {
1323 // get a new handler blob
1324 handler = set_handler_blob();
1325 }
1326 if (handler != nullptr) {
1327 memcpy(handler, buffer->insts_begin(), insts_size);
1328 pd_set_handler(handler);
1329 ICache::invalidate_range(handler, insts_size);
1330 _handler = handler + insts_size;
1331 }
1332 return handler;
1333 }
1334
1335 void SignatureHandlerLibrary::add(const methodHandle& method) {
1336 if (method->signature_handler() == nullptr) {
1337 // use slow signature handler if we can't do better
1338 int handler_index = -1;
1339 // check if we can use customized (fast) signature handler
1340 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1341 // use customized signature handler
1342 MutexLocker mu(SignatureHandlerLibrary_lock);
1343 // make sure data structure is initialized
1344 initialize();
1345 // lookup method signature's fingerprint
1346 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1347 // allow CPU dependent code to optimize the fingerprints for the fast handler
1348 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1349 handler_index = _fingerprints->find(fingerprint);
1350 // create handler if necessary
1351 if (handler_index < 0) {
1352 ResourceMark rm;
1353 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1354 CodeBuffer buffer((address)(_buffer + align_offset),
1355 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1356 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1357 // copy into code heap
1358 address handler = set_handler(&buffer);
1359 if (handler == nullptr) {
1360 // use slow signature handler (without memorizing it in the fingerprints)
1361 } else {
1362 // debugging support
1363 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1364 ttyLocker ttyl;
1365 tty->cr();
1366 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1367 _handlers->length(),
1368 (method->is_static() ? "static" : "receiver"),
1369 method->name_and_sig_as_C_string(),
1370 fingerprint,
1371 buffer.insts_size());
1372 if (buffer.insts_size() > 0) {
1373 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1374 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1375 }
1376 #ifndef PRODUCT
1377 address rh_begin = Interpreter::result_handler(method()->result_type());
1378 if (CodeCache::contains(rh_begin)) {
1379 // else it might be special platform dependent values
1380 tty->print_cr(" --- associated result handler ---");
1381 address rh_end = rh_begin;
1382 while (*(int*)rh_end != 0) {
1383 rh_end += sizeof(int);
1384 }
1385 Disassembler::decode(rh_begin, rh_end);
1386 } else {
1387 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1388 }
1389 #endif
1390 }
1391 // add handler to library
1392 _fingerprints->append(fingerprint);
1393 _handlers->append(handler);
1394 // set handler index
1395 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1396 handler_index = _fingerprints->length() - 1;
1397 }
1398 }
1399 // Set handler under SignatureHandlerLibrary_lock
1400 if (handler_index < 0) {
1401 // use generic signature handler
1402 method->set_signature_handler(Interpreter::slow_signature_handler());
1403 } else {
1404 // set handler
1405 method->set_signature_handler(_handlers->at(handler_index));
1406 }
1407 } else {
1408 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1409 // use generic signature handler
1410 method->set_signature_handler(Interpreter::slow_signature_handler());
1411 }
1412 }
1413 #ifdef ASSERT
1414 int handler_index = -1;
1415 int fingerprint_index = -2;
1416 {
1417 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1418 // in any way if accessed from multiple threads. To avoid races with another
1419 // thread which may change the arrays in the above, mutex protected block, we
1420 // have to protect this read access here with the same mutex as well!
1421 MutexLocker mu(SignatureHandlerLibrary_lock);
1422 if (_handlers != nullptr) {
1423 handler_index = _handlers->find(method->signature_handler());
1424 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1425 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1426 fingerprint_index = _fingerprints->find(fingerprint);
1427 }
1428 }
1429 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1430 handler_index == fingerprint_index, "sanity check");
1431 #endif // ASSERT
1432 }
1433
1434 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1435 int handler_index = -1;
1436 // use customized signature handler
1437 MutexLocker mu(SignatureHandlerLibrary_lock);
1438 // make sure data structure is initialized
1439 initialize();
1440 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1441 handler_index = _fingerprints->find(fingerprint);
1442 // create handler if necessary
1443 if (handler_index < 0) {
1444 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1445 tty->cr();
1446 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1447 _handlers->length(),
1448 p2i(handler),
1449 fingerprint);
1450 }
1451 _fingerprints->append(fingerprint);
1452 _handlers->append(handler);
1453 } else {
1454 if (PrintSignatureHandlers) {
1455 tty->cr();
1456 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1457 _handlers->length(),
1458 fingerprint,
1459 p2i(_handlers->at(handler_index)),
1460 p2i(handler));
1461 }
1462 }
1463 }
1464
1465
1466 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1467 address SignatureHandlerLibrary::_handler = nullptr;
1468 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1469 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1470 address SignatureHandlerLibrary::_buffer = nullptr;
1471
1472
1473 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1474 methodHandle m(current, method);
1475 assert(m->is_native(), "sanity check");
1476 // lookup native function entry point if it doesn't exist
1477 if (!m->has_native_function()) {
1478 NativeLookup::lookup(m, CHECK);
1479 }
1480 // make sure signature handler is installed
1481 SignatureHandlerLibrary::add(m);
1482 // The interpreter entry point checks the signature handler first,
1483 // before trying to fetch the native entry point and klass mirror.
1484 // We must set the signature handler last, so that multiple processors
1485 // preparing the same method will be sure to see non-null entry & mirror.
1486 JRT_END
1487
1488 #if defined(IA32) || defined(AMD64) || defined(ARM)
1489 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1490 assert(current == JavaThread::current(), "pre-condition");
1491 if (src_address == dest_address) {
1492 return;
1493 }
1494 ResourceMark rm;
1495 LastFrameAccessor last_frame(current);
1496 assert(last_frame.is_interpreted_frame(), "");
1497 jint bci = last_frame.bci();
1498 methodHandle mh(current, last_frame.method());
1499 Bytecode_invoke invoke(mh, bci);
1500 ArgumentSizeComputer asc(invoke.signature());
1501 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1502 Copy::conjoint_jbytes(src_address, dest_address,
1503 size_of_arguments * Interpreter::stackElementSize);
1504 JRT_END
1505 #endif
1506
1507 #if INCLUDE_JVMTI
1508 // This is a support of the JVMTI PopFrame interface.
1509 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1510 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1511 // The member_name argument is a saved reference (in local#0) to the member_name.
1512 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1513 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1514 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1515 Method* method, address bcp))
1516 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1517 if (code != Bytecodes::_invokestatic) {
1518 return;
1519 }
1520 ConstantPool* cpool = method->constants();
1521 int cp_index = Bytes::get_native_u2(bcp + 1);
1522 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1523 Symbol* mname = cpool->name_ref_at(cp_index, code);
1524
1525 if (MethodHandles::has_member_arg(cname, mname)) {
1526 oop member_name_oop = cast_to_oop(member_name);
1527 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1528 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1529 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1530 }
1531 current->set_vm_result(member_name_oop);
1532 } else {
1533 current->set_vm_result(nullptr);
1534 }
1535 JRT_END
1536 #endif // INCLUDE_JVMTI
1537
1538 #ifndef PRODUCT
1539 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1540 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1541 // The generated code still uses call_VM because that will set up the frame pointer for
1542 // bcp and method.
1543 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1544 assert(current == JavaThread::current(), "pre-condition");
1545 LastFrameAccessor last_frame(current);
1546 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1547 methodHandle mh(current, last_frame.method());
1548 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1549 return preserve_this_value;
1550 JRT_END
1551 #endif // !PRODUCT