1 /*
2 * Copyright (c) 1997, 2021, 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 "jvm_io.h"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "compiler/compilationPolicy.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/disassembler.hpp"
35 #include "gc/shared/barrierSetNMethod.hpp"
36 #include "gc/shared/collectedHeap.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "interpreter/interpreterRuntime.hpp"
39 #include "interpreter/linkResolver.hpp"
40 #include "interpreter/templateTable.hpp"
41 #include "logging/log.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.hpp"
45 #include "oops/constantPool.hpp"
46 #include "oops/cpCache.inline.hpp"
47 #include "oops/instanceKlass.inline.hpp"
48 #include "oops/klass.inline.hpp"
49 #include "oops/methodData.hpp"
50 #include "oops/objArrayKlass.hpp"
51 #include "oops/objArrayOop.inline.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "oops/symbol.hpp"
54 #include "prims/jvmtiExport.hpp"
55 #include "prims/methodHandles.hpp"
56 #include "prims/nativeLookup.hpp"
57 #include "runtime/atomic.hpp"
58 #include "runtime/continuation.hpp"
59 #include "runtime/deoptimization.hpp"
60 #include "runtime/fieldDescriptor.inline.hpp"
61 #include "runtime/frame.inline.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/icache.hpp"
64 #include "runtime/interfaceSupport.inline.hpp"
65 #include "runtime/java.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/jfieldIDWorkaround.hpp"
68 #include "runtime/osThread.hpp"
69 #include "runtime/sharedRuntime.hpp"
70 #include "runtime/stackWatermarkSet.hpp"
71 #include "runtime/stubRoutines.hpp"
72 #include "runtime/synchronizer.hpp"
73 #include "runtime/threadCritical.hpp"
74 #include "utilities/align.hpp"
75 #include "utilities/copy.hpp"
76 #include "utilities/events.hpp"
77 #ifdef COMPILER2
78 #include "opto/runtime.hpp"
79 #endif
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_u2_cpcache(Bytecodes::Code bc) const
105 { return bytecode().get_index_u2_cpcache(bc); }
106 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
107 int number_of_dimensions() const { return bcp()[3]; }
108 ConstantPoolCacheEntry* cache_entry_at(int i) const
109 { return method()->constants()->cache()->entry_at(i); }
110 ConstantPoolCacheEntry* cache_entry() const { return cache_entry_at(Bytes::get_native_u2(bcp() + 1)); }
111
112 oop callee_receiver(Symbol* signature) {
113 return _last_frame.interpreter_callee_receiver(signature);
114 }
115 BasicObjectLock* monitor_begin() const {
116 return _last_frame.interpreter_frame_monitor_begin();
117 }
118 BasicObjectLock* monitor_end() const {
119 return _last_frame.interpreter_frame_monitor_end();
120 }
121 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
122 return _last_frame.next_monitor_in_interpreter_frame(current);
123 }
124
125 frame& get_frame() { return _last_frame; }
126 };
127
128 //------------------------------------------------------------------------------------------------------------------------
129 // State accessors
130
131 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
132 LastFrameAccessor last_frame(current);
133 last_frame.set_bcp(bcp);
134 if (ProfileInterpreter) {
135 // ProfileTraps uses MDOs independently of ProfileInterpreter.
136 // That is why we must check both ProfileInterpreter and mdo != NULL.
137 MethodData* mdo = last_frame.method()->method_data();
138 if (mdo != NULL) {
139 NEEDS_CLEANUP;
140 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
141 }
142 }
143 }
144
145 //------------------------------------------------------------------------------------------------------------------------
146 // Constants
147
148
149 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
150 // access constant pool
151 LastFrameAccessor last_frame(current);
152 ConstantPool* pool = last_frame.method()->constants();
153 int index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
154 constantTag tag = pool->tag_at(index);
155
156 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
157 Klass* klass = pool->klass_at(index, CHECK);
158 oop java_class = klass->java_mirror();
159 current->set_vm_result(java_class);
160 JRT_END
161
162 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
163 assert(bytecode == Bytecodes::_ldc ||
164 bytecode == Bytecodes::_ldc_w ||
165 bytecode == Bytecodes::_ldc2_w ||
166 bytecode == Bytecodes::_fast_aldc ||
167 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
168 ResourceMark rm(current);
169 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
170 bytecode == Bytecodes::_fast_aldc_w);
171 LastFrameAccessor last_frame(current);
172 methodHandle m (current, last_frame.method());
173 Bytecode_loadconstant ldc(m, last_frame.bci());
174
175 // Double-check the size. (Condy can have any type.)
176 BasicType type = ldc.result_type();
177 switch (type2size[type]) {
178 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
179 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
180 default: ShouldNotReachHere();
181 }
182
183 // Resolve the constant. This does not do unboxing.
184 // But it does replace Universe::the_null_sentinel by null.
185 oop result = ldc.resolve_constant(CHECK);
186 assert(result != NULL || is_fast_aldc, "null result only valid for fast_aldc");
187
188 #ifdef ASSERT
189 {
190 // The bytecode wrappers aren't GC-safe so construct a new one
191 Bytecode_loadconstant ldc2(m, last_frame.bci());
192 int rindex = ldc2.cache_index();
193 if (rindex < 0)
194 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
195 if (rindex >= 0) {
196 oop coop = m->constants()->resolved_references()->obj_at(rindex);
197 oop roop = (result == NULL ? Universe::the_null_sentinel() : result);
198 assert(roop == coop, "expected result for assembly code");
199 }
200 }
201 #endif
202 current->set_vm_result(result);
203 if (!is_fast_aldc) {
204 // Tell the interpreter how to unbox the primitive.
205 guarantee(java_lang_boxing_object::is_instance(result, type), "");
206 int offset = java_lang_boxing_object::value_offset(type);
207 intptr_t flags = ((as_TosState(type) << ConstantPoolCacheEntry::tos_state_shift)
208 | (offset & ConstantPoolCacheEntry::field_index_mask));
209 current->set_vm_result_2((Metadata*)flags);
210 }
211 }
212 JRT_END
213
214
215 //------------------------------------------------------------------------------------------------------------------------
216 // Allocation
217
218 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
219 Klass* k = pool->klass_at(index, CHECK);
220 InstanceKlass* klass = InstanceKlass::cast(k);
221
222 // Make sure we are not instantiating an abstract klass
223 klass->check_valid_for_instantiation(true, CHECK);
224
225 // Make sure klass is initialized
226 klass->initialize(CHECK);
227
228 // At this point the class may not be fully initialized
229 // because of recursive initialization. If it is fully
230 // initialized & has_finalized is not set, we rewrite
231 // it into its fast version (Note: no locking is needed
232 // here since this is an atomic byte write and can be
233 // done more than once).
234 //
235 // Note: In case of classes with has_finalized we don't
236 // rewrite since that saves us an extra check in
237 // the fast version which then would call the
238 // slow version anyway (and do a call back into
239 // Java).
240 // If we have a breakpoint, then we don't rewrite
241 // because the _breakpoint bytecode would be lost.
242 oop obj = klass->allocate_instance(CHECK);
243 current->set_vm_result(obj);
244 JRT_END
245
246
247 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
248 oop obj = oopFactory::new_typeArray(type, size, CHECK);
249 current->set_vm_result(obj);
250 JRT_END
251
252
253 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
254 Klass* klass = pool->klass_at(index, CHECK);
255 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
256 current->set_vm_result(obj);
257 JRT_END
258
259
260 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
261 // We may want to pass in more arguments - could make this slightly faster
262 LastFrameAccessor last_frame(current);
263 ConstantPool* constants = last_frame.method()->constants();
264 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
265 Klass* klass = constants->klass_at(i, CHECK);
266 int nof_dims = last_frame.number_of_dimensions();
267 assert(klass->is_klass(), "not a class");
268 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
269
270 // We must create an array of jints to pass to multi_allocate.
271 ResourceMark rm(current);
272 const int small_dims = 10;
273 jint dim_array[small_dims];
274 jint *dims = &dim_array[0];
275 if (nof_dims > small_dims) {
276 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
277 }
278 for (int index = 0; index < nof_dims; index++) {
279 // offset from first_size_address is addressed as local[index]
280 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
281 dims[index] = first_size_address[n];
282 }
283 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
284 current->set_vm_result(obj);
285 JRT_END
286
287
288 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
289 assert(oopDesc::is_oop(obj), "must be a valid oop");
290 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
291 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
292 JRT_END
293
294
295 // Quicken instance-of and check-cast bytecodes
296 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
297 // Force resolving; quicken the bytecode
298 LastFrameAccessor last_frame(current);
299 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
300 ConstantPool* cpool = last_frame.method()->constants();
301 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
302 // program we might have seen an unquick'd bytecode in the interpreter but have another
303 // thread quicken the bytecode before we get here.
304 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
305 Klass* klass = cpool->klass_at(which, CHECK);
306 current->set_vm_result_2(klass);
307 JRT_END
308
309
310 //------------------------------------------------------------------------------------------------------------------------
311 // Exceptions
312
313 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
314 const methodHandle& trap_method, int trap_bci) {
315 if (trap_method.not_null()) {
316 MethodData* trap_mdo = trap_method->method_data();
317 if (trap_mdo == NULL) {
318 ExceptionMark em(current);
319 JavaThread* THREAD = current; // For exception macros.
320 Method::build_interpreter_method_data(trap_method, THREAD);
321 if (HAS_PENDING_EXCEPTION) {
322 // Only metaspace OOM is expected. No Java code executed.
323 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
324 "we expect only an OOM error here");
325 CLEAR_PENDING_EXCEPTION;
326 }
327 trap_mdo = trap_method->method_data();
328 // and fall through...
329 }
330 if (trap_mdo != NULL) {
331 // Update per-method count of trap events. The interpreter
332 // is updating the MDO to simulate the effect of compiler traps.
333 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
334 }
335 }
336 }
337
338 // Assume the compiler is (or will be) interested in this event.
339 // If necessary, create an MDO to hold the information, and record it.
340 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
341 assert(ProfileTraps, "call me only if profiling");
342 LastFrameAccessor last_frame(current);
343 methodHandle trap_method(current, last_frame.method());
344 int trap_bci = trap_method->bci_from(last_frame.bcp());
345 note_trap_inner(current, reason, trap_method, trap_bci);
346 }
347
348 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
349 // get klass
350 InstanceKlass* klass = InstanceKlass::cast(k);
351 assert(klass->is_initialized(),
352 "this klass should have been initialized during VM initialization");
353 // create instance - do not call constructor since we may have no
354 // (java) stack space left (should assert constructor is empty)
355 Handle exception;
356 oop exception_oop = klass->allocate_instance(CHECK_(exception));
357 exception = Handle(THREAD, exception_oop);
358 if (StackTraceInThrowable) {
359 java_lang_Throwable::fill_in_stack_trace(exception);
360 }
361 return exception;
362 }
363
364 // Special handling for stack overflow: since we don't have any (java) stack
365 // space left we use the pre-allocated & pre-initialized StackOverflowError
366 // klass to create an stack overflow error instance. We do not call its
367 // constructor for the same reason (it is empty, anyway).
368 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
369 Handle exception = get_preinitialized_exception(
370 vmClasses::StackOverflowError_klass(),
371 CHECK);
372 // Increment counter for hs_err file reporting
373 Atomic::inc(&Exceptions::_stack_overflow_errors);
374 THROW_HANDLE(exception);
375 JRT_END
376
377 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
378 Handle exception = get_preinitialized_exception(
379 vmClasses::StackOverflowError_klass(),
380 CHECK);
381 java_lang_Throwable::set_message(exception(),
382 Universe::delayed_stack_overflow_error_message());
383 // Increment counter for hs_err file reporting
384 Atomic::inc(&Exceptions::_stack_overflow_errors);
385 THROW_HANDLE(exception);
386 JRT_END
387
388 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
389 // lookup exception klass
390 TempNewSymbol s = SymbolTable::new_symbol(name);
391 if (ProfileTraps) {
392 if (s == vmSymbols::java_lang_ArithmeticException()) {
393 note_trap(current, Deoptimization::Reason_div0_check);
394 } else if (s == vmSymbols::java_lang_NullPointerException()) {
395 note_trap(current, Deoptimization::Reason_null_check);
396 }
397 }
398 // create exception
399 Handle exception = Exceptions::new_exception(current, s, message);
400 current->set_vm_result(exception());
401 JRT_END
402
403
404 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
405 // Produce the error message first because note_trap can safepoint
406 ResourceMark rm(current);
407 const char* klass_name = obj->klass()->external_name();
408 // lookup exception klass
409 TempNewSymbol s = SymbolTable::new_symbol(name);
410 if (ProfileTraps) {
411 note_trap(current, Deoptimization::Reason_class_check);
412 }
413 // create exception, with klass name as detail message
414 Handle exception = Exceptions::new_exception(current, s, klass_name);
415 current->set_vm_result(exception());
416 JRT_END
417
418 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
419 // Produce the error message first because note_trap can safepoint
420 ResourceMark rm(current);
421 stringStream ss;
422 ss.print("Index %d out of bounds for length %d", index, a->length());
423
424 if (ProfileTraps) {
425 note_trap(current, Deoptimization::Reason_range_check);
426 }
427
428 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
429 JRT_END
430
431 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
432 JavaThread* current, oopDesc* obj))
433
434 // Produce the error message first because note_trap can safepoint
435 ResourceMark rm(current);
436 char* message = SharedRuntime::generate_class_cast_message(
437 current, obj->klass());
438
439 if (ProfileTraps) {
440 note_trap(current, Deoptimization::Reason_class_check);
441 }
442
443 // create exception
444 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
445 JRT_END
446
447 // exception_handler_for_exception(...) returns the continuation address,
448 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
449 // The exception oop is returned to make sure it is preserved over GC (it
450 // is only on the stack if the exception was thrown explicitly via athrow).
451 // During this operation, the expression stack contains the values for the
452 // bci where the exception happened. If the exception was propagated back
453 // from a call, the expression stack contains the values for the bci at the
454 // invoke w/o arguments (i.e., as if one were inside the call).
455 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
456 // We get here after we have unwound from a callee throwing an exception
457 // into the interpreter. Any deferred stack processing is notified of
458 // the event via the StackWatermarkSet.
459 StackWatermarkSet::after_unwind(current);
460
461 LastFrameAccessor last_frame(current);
462 Handle h_exception(current, exception);
463 methodHandle h_method (current, last_frame.method());
464 constantPoolHandle h_constants(current, h_method->constants());
465 bool should_repeat;
466 int handler_bci;
467 int current_bci = last_frame.bci();
468
469 if (current->frames_to_pop_failed_realloc() > 0) {
470 // Allocation of scalar replaced object used in this frame
471 // failed. Unconditionally pop the frame.
472 current->dec_frames_to_pop_failed_realloc();
473 current->set_vm_result(h_exception());
474 // If the method is synchronized we already unlocked the monitor
475 // during deoptimization so the interpreter needs to skip it when
476 // the frame is popped.
477 current->set_do_not_unlock_if_synchronized(true);
478 return Interpreter::remove_activation_entry();
479 }
480
481 // Need to do this check first since when _do_not_unlock_if_synchronized
482 // is set, we don't want to trigger any classloading which may make calls
483 // into java, or surprisingly find a matching exception handler for bci 0
484 // since at this moment the method hasn't been "officially" entered yet.
485 if (current->do_not_unlock_if_synchronized()) {
486 ResourceMark rm;
487 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
488 current->set_vm_result(exception);
489 return Interpreter::remove_activation_entry();
490 }
491
492 do {
493 should_repeat = false;
494
495 // assertions
496 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
497 // Check that exception is a subclass of Throwable.
498 assert(h_exception->is_a(vmClasses::Throwable_klass()),
499 "Exception not subclass of Throwable");
500
501 // tracing
502 if (log_is_enabled(Info, exceptions)) {
503 ResourceMark rm(current);
504 stringStream tempst;
505 tempst.print("interpreter method <%s>\n"
506 " at bci %d for thread " INTPTR_FORMAT " (%s)",
507 h_method->print_value_string(), current_bci, p2i(current), current->name());
508 Exceptions::log_exception(h_exception, tempst.as_string());
509 }
510 // Don't go paging in something which won't be used.
511 // else if (extable->length() == 0) {
512 // // disabled for now - interpreter is not using shortcut yet
513 // // (shortcut is not to call runtime if we have no exception handlers)
514 // // warning("performance bug: should not call runtime if method has no exception handlers");
515 // }
516 // for AbortVMOnException flag
517 Exceptions::debug_check_abort(h_exception);
518
519 // exception handler lookup
520 Klass* klass = h_exception->klass();
521 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
522 if (HAS_PENDING_EXCEPTION) {
523 // We threw an exception while trying to find the exception handler.
524 // Transfer the new exception to the exception handle which will
525 // be set into thread local storage, and do another lookup for an
526 // exception handler for this exception, this time starting at the
527 // BCI of the exception handler which caused the exception to be
528 // thrown (bug 4307310).
529 h_exception = Handle(THREAD, PENDING_EXCEPTION);
530 CLEAR_PENDING_EXCEPTION;
531 if (handler_bci >= 0) {
532 current_bci = handler_bci;
533 should_repeat = true;
534 }
535 }
536 } while (should_repeat == true);
537
538 #if INCLUDE_JVMCI
539 if (EnableJVMCI && h_method->method_data() != NULL) {
540 ResourceMark rm(current);
541 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);
542 if (pdata != NULL && pdata->is_BitData()) {
543 BitData* bit_data = (BitData*) pdata;
544 bit_data->set_exception_seen();
545 }
546 }
547 #endif
548
549 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
550 // time throw or a stack unwinding throw and accordingly notify the debugger
551 if (JvmtiExport::can_post_on_exceptions()) {
552 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
553 }
554
555 address continuation = NULL;
556 address handler_pc = NULL;
557 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
558 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
559 // handler in this method, or (b) after a stack overflow there is not yet
560 // enough stack space available to reprotect the stack.
561 continuation = Interpreter::remove_activation_entry();
562 #if COMPILER2_OR_JVMCI
563 // Count this for compilation purposes
564 h_method->interpreter_throwout_increment(THREAD);
565 #endif
566 } else {
567 // handler in this method => change bci/bcp to handler bci/bcp and continue there
568 handler_pc = h_method->code_base() + handler_bci;
569 #ifndef ZERO
570 set_bcp_and_mdp(handler_pc, current);
571 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
572 #else
573 continuation = (address)(intptr_t) handler_bci;
574 #endif
575 }
576
577 // notify debugger of an exception catch
578 // (this is good for exceptions caught in native methods as well)
579 if (JvmtiExport::can_post_on_exceptions()) {
580 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
581 }
582
583 current->set_vm_result(h_exception());
584 return continuation;
585 JRT_END
586
587
588 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
589 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
590 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
591 JRT_END
592
593
594 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
595 THROW(vmSymbols::java_lang_AbstractMethodError());
596 JRT_END
597
598 // This method is called from the "abstract_entry" of the interpreter.
599 // At that point, the arguments have already been removed from the stack
600 // and therefore we don't have the receiver object at our fingertips. (Though,
601 // on some platforms the receiver still resides in a register...). Thus,
602 // we have no choice but print an error message not containing the receiver
603 // type.
604 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
605 Method* missingMethod))
606 ResourceMark rm(current);
607 assert(missingMethod != NULL, "sanity");
608 methodHandle m(current, missingMethod);
609 LinkResolver::throw_abstract_method_error(m, THREAD);
610 JRT_END
611
612 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
613 Klass* recvKlass,
614 Method* missingMethod))
615 ResourceMark rm(current);
616 methodHandle mh = methodHandle(current, missingMethod);
617 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
618 JRT_END
619
620
621 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
622 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
623 JRT_END
624
625 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
626 Klass* recvKlass,
627 Klass* interfaceKlass))
628 ResourceMark rm(current);
629 char buf[1000];
630 buf[0] = '\0';
631 jio_snprintf(buf, sizeof(buf),
632 "Class %s does not implement the requested interface %s",
633 recvKlass ? recvKlass->external_name() : "NULL",
634 interfaceKlass ? interfaceKlass->external_name() : "NULL");
635 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
636 JRT_END
637
638 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
639 THROW(vmSymbols::java_lang_NullPointerException());
640 JRT_END
641
642 //------------------------------------------------------------------------------------------------------------------------
643 // Fields
644 //
645
646 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
647 // resolve field
648 fieldDescriptor info;
649 LastFrameAccessor last_frame(current);
650 constantPoolHandle pool(current, last_frame.method()->constants());
651 methodHandle m(current, last_frame.method());
652 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
653 bytecode == Bytecodes::_putstatic);
654 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
655
656 {
657 JvmtiHideSingleStepping jhss(current);
658 JavaThread* THREAD = current; // For exception macros.
659 LinkResolver::resolve_field_access(info, pool, last_frame.get_index_u2_cpcache(bytecode),
660 m, bytecode, CHECK);
661 } // end JvmtiHideSingleStepping
662
663 // check if link resolution caused cpCache to be updated
664 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
665 if (cp_cache_entry->is_resolved(bytecode)) return;
666
667 // compute auxiliary field attributes
668 TosState state = as_TosState(info.field_type());
669
670 // Resolution of put instructions on final fields is delayed. That is required so that
671 // exceptions are thrown at the correct place (when the instruction is actually invoked).
672 // If we do not resolve an instruction in the current pass, leaving the put_code
673 // set to zero will cause the next put instruction to the same field to reresolve.
674
675 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
676 // to final instance fields with updates originating from a method different than <init>)
677 // is inhibited. A putfield instruction targeting an instance final field must throw
678 // an IllegalAccessError if the instruction is not in an instance
679 // initializer method <init>. If resolution were not inhibited, a putfield
680 // in an initializer method could be resolved in the initializer. Subsequent
681 // putfield instructions to the same field would then use cached information.
682 // As a result, those instructions would not pass through the VM. That is,
683 // checks in resolve_field_access() would not be executed for those instructions
684 // and the required IllegalAccessError would not be thrown.
685 //
686 // Also, we need to delay resolving getstatic and putstatic instructions until the
687 // class is initialized. This is required so that access to the static
688 // field will call the initialization function every time until the class
689 // is completely initialized ala. in 2.17.5 in JVM Specification.
690 InstanceKlass* klass = info.field_holder();
691 bool uninitialized_static = is_static && !klass->is_initialized();
692 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
693 info.has_initialized_final_update();
694 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
695
696 Bytecodes::Code get_code = (Bytecodes::Code)0;
697 Bytecodes::Code put_code = (Bytecodes::Code)0;
698 if (!uninitialized_static) {
699 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
700 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
701 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
702 }
703 }
704
705 cp_cache_entry->set_field(
706 get_code,
707 put_code,
708 info.field_holder(),
709 info.index(),
710 info.offset(),
711 state,
712 info.access_flags().is_final(),
713 info.access_flags().is_volatile()
714 );
715 }
716
717
718 //------------------------------------------------------------------------------------------------------------------------
719 // Synchronization
720 //
721 // The interpreter's synchronization code is factored out so that it can
722 // be shared by method invocation and synchronized blocks.
723 //%note synchronization_3
724
725 //%note monitor_1
726 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
727 #ifdef ASSERT
728 current->last_frame().interpreter_frame_verify_monitor(elem);
729 #endif
730 Handle h_obj(current, elem->obj());
731 assert(Universe::heap()->is_in_or_null(h_obj()),
732 "must be NULL or an object");
733 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
734 assert(Universe::heap()->is_in_or_null(elem->obj()),
735 "must be NULL or an object");
736 #ifdef ASSERT
737 current->last_frame().interpreter_frame_verify_monitor(elem);
738 #endif
739 JRT_END
740
741
742 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
743 oop obj = elem->obj();
744 assert(Universe::heap()->is_in(obj), "must be an object");
745 // The object could become unlocked through a JNI call, which we have no other checks for.
746 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
747 if (obj->is_unlocked()) {
748 if (CheckJNICalls) {
749 fatal("Object has been unlocked by JNI");
750 }
751 return;
752 }
753 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
754 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
755 // again at method exit or in the case of an exception.
756 elem->set_obj(NULL);
757 JRT_END
758
759
760 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
761 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
762 JRT_END
763
764
765 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
766 // Returns an illegal exception to install into the current thread. The
767 // pending_exception flag is cleared so normal exception handling does not
768 // trigger. Any current installed exception will be overwritten. This
769 // method will be called during an exception unwind.
770
771 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
772 Handle exception(current, current->vm_result());
773 assert(exception() != NULL, "vm result should be set");
774 current->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
775 if (!exception->is_a(vmClasses::ThreadDeath_klass())) {
776 exception = get_preinitialized_exception(
777 vmClasses::IllegalMonitorStateException_klass(),
778 CATCH);
779 }
780 current->set_vm_result(exception());
781 JRT_END
782
783
784 //------------------------------------------------------------------------------------------------------------------------
785 // Invokes
786
787 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
788 return method->orig_bytecode_at(method->bci_from(bcp));
789 JRT_END
790
791 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
792 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
793 JRT_END
794
795 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
796 JvmtiExport::post_raw_breakpoint(current, method, bcp);
797 JRT_END
798
799 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
800 LastFrameAccessor last_frame(current);
801 // extract receiver from the outgoing argument list if necessary
802 Handle receiver(current, NULL);
803 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
804 bytecode == Bytecodes::_invokespecial) {
805 ResourceMark rm(current);
806 methodHandle m (current, last_frame.method());
807 Bytecode_invoke call(m, last_frame.bci());
808 Symbol* signature = call.signature();
809 receiver = Handle(current, last_frame.callee_receiver(signature));
810
811 assert(Universe::heap()->is_in_or_null(receiver()),
812 "sanity check");
813 assert(receiver.is_null() ||
814 !Universe::heap()->is_in(receiver->klass()),
815 "sanity check");
816 }
817
818 // resolve method
819 CallInfo info;
820 constantPoolHandle pool(current, last_frame.method()->constants());
821
822 methodHandle resolved_method;
823
824 {
825 JvmtiHideSingleStepping jhss(current);
826 JavaThread* THREAD = current; // For exception macros.
827 LinkResolver::resolve_invoke(info, receiver, pool,
828 last_frame.get_index_u2_cpcache(bytecode), bytecode,
829 CHECK);
830 if (JvmtiExport::can_hotswap_or_post_breakpoint() && info.resolved_method()->is_old()) {
831 resolved_method = methodHandle(current, info.resolved_method()->get_new_method());
832 } else {
833 resolved_method = methodHandle(current, info.resolved_method());
834 }
835 } // end JvmtiHideSingleStepping
836
837 // check if link resolution caused cpCache to be updated
838 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
839 if (cp_cache_entry->is_resolved(bytecode)) return;
840
841 #ifdef ASSERT
842 if (bytecode == Bytecodes::_invokeinterface) {
843 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
844 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
845 // (see also CallInfo::set_interface for details)
846 assert(info.call_kind() == CallInfo::vtable_call ||
847 info.call_kind() == CallInfo::direct_call, "");
848 assert(resolved_method->is_final() || info.has_vtable_index(),
849 "should have been set already");
850 } else if (!resolved_method->has_itable_index()) {
851 // Resolved something like CharSequence.toString. Use vtable not itable.
852 assert(info.call_kind() != CallInfo::itable_call, "");
853 } else {
854 // Setup itable entry
855 assert(info.call_kind() == CallInfo::itable_call, "");
856 int index = resolved_method->itable_index();
857 assert(info.itable_index() == index, "");
858 }
859 } else if (bytecode == Bytecodes::_invokespecial) {
860 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
861 } else {
862 assert(info.call_kind() == CallInfo::direct_call ||
863 info.call_kind() == CallInfo::vtable_call, "");
864 }
865 #endif
866 // Get sender and only set cpCache entry to resolved if it is not an
867 // interface. The receiver for invokespecial calls within interface
868 // methods must be checked for every call.
869 InstanceKlass* sender = pool->pool_holder();
870
871 switch (info.call_kind()) {
872 case CallInfo::direct_call:
873 cp_cache_entry->set_direct_call(
874 bytecode,
875 resolved_method,
876 sender->is_interface());
877 break;
878 case CallInfo::vtable_call:
879 cp_cache_entry->set_vtable_call(
880 bytecode,
881 resolved_method,
882 info.vtable_index());
883 break;
884 case CallInfo::itable_call:
885 cp_cache_entry->set_itable_call(
886 bytecode,
887 info.resolved_klass(),
888 resolved_method,
889 info.itable_index());
890 break;
891 default: ShouldNotReachHere();
892 }
893 }
894
895
896 // First time execution: Resolve symbols, create a permanent MethodType object.
897 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
898 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
899 LastFrameAccessor last_frame(current);
900
901 // resolve method
902 CallInfo info;
903 constantPoolHandle pool(current, last_frame.method()->constants());
904 {
905 JvmtiHideSingleStepping jhss(current);
906 JavaThread* THREAD = current; // For exception macros.
907 LinkResolver::resolve_invoke(info, Handle(), pool,
908 last_frame.get_index_u2_cpcache(bytecode), bytecode,
909 CHECK);
910 } // end JvmtiHideSingleStepping
911
912 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
913 cp_cache_entry->set_method_handle(pool, info);
914 }
915
916 // First time execution: Resolve symbols, create a permanent CallSite object.
917 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
918 LastFrameAccessor last_frame(current);
919 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
920
921 // resolve method
922 CallInfo info;
923 constantPoolHandle pool(current, last_frame.method()->constants());
924 int index = last_frame.get_index_u4(bytecode);
925 {
926 JvmtiHideSingleStepping jhss(current);
927 JavaThread* THREAD = current; // For exception macros.
928 LinkResolver::resolve_invoke(info, Handle(), pool,
929 index, bytecode, CHECK);
930 } // end JvmtiHideSingleStepping
931
932 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
933 cp_cache_entry->set_dynamic_call(pool, info);
934 }
935
936 // This function is the interface to the assembly code. It returns the resolved
937 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
938 // This function will check for redefinition!
939 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
940 switch (bytecode) {
941 case Bytecodes::_getstatic:
942 case Bytecodes::_putstatic:
943 case Bytecodes::_getfield:
944 case Bytecodes::_putfield:
945 resolve_get_put(current, bytecode);
946 break;
947 case Bytecodes::_invokevirtual:
948 case Bytecodes::_invokespecial:
949 case Bytecodes::_invokestatic:
950 case Bytecodes::_invokeinterface:
951 resolve_invoke(current, bytecode);
952 break;
953 case Bytecodes::_invokehandle:
954 resolve_invokehandle(current);
955 break;
956 case Bytecodes::_invokedynamic:
957 resolve_invokedynamic(current);
958 break;
959 default:
960 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
961 break;
962 }
963 }
964 JRT_END
965
966 //------------------------------------------------------------------------------------------------------------------------
967 // Miscellaneous
968
969
970 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
971 // Enable WXWrite: the function is called directly by interpreter.
972 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
973
974 // frequency_counter_overflow_inner can throw async exception.
975 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
976 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
977 if (branch_bcp != NULL && nm != NULL) {
978 // This was a successful request for an OSR nmethod. Because
979 // frequency_counter_overflow_inner ends with a safepoint check,
980 // nm could have been unloaded so look it up again. It's unsafe
981 // to examine nm directly since it might have been freed and used
982 // for something else.
983 LastFrameAccessor last_frame(current);
984 Method* method = last_frame.method();
985 int bci = method->bci_from(last_frame.bcp());
986 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
987 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
988 if (nm != NULL && bs_nm != NULL) {
989 // in case the transition passed a safepoint we need to barrier this again
990 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
991 nm = NULL;
992 }
993 }
994 }
995 if (nm != NULL && current->is_interp_only_mode()) {
996 // Normally we never get an nm if is_interp_only_mode() is true, because
997 // policy()->event has a check for this and won't compile the method when
998 // true. However, it's possible for is_interp_only_mode() to become true
999 // during the compilation. We don't want to return the nm in that case
1000 // because we want to continue to execute interpreted.
1001 nm = NULL;
1002 }
1003 #ifndef PRODUCT
1004 if (TraceOnStackReplacement) {
1005 if (nm != NULL) {
1006 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1007 nm->print();
1008 }
1009 }
1010 #endif
1011 return nm;
1012 }
1013
1014 JRT_ENTRY(nmethod*,
1015 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1016 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1017 // flag, in case this method triggers classloading which will call into Java.
1018 UnlockFlagSaver fs(current);
1019
1020 LastFrameAccessor last_frame(current);
1021 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1022 methodHandle method(current, last_frame.method());
1023 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
1024 const int bci = branch_bcp != NULL ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1025
1026 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, NULL, CHECK_NULL);
1027
1028 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1029 if (osr_nm != NULL && bs_nm != NULL) {
1030 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1031 osr_nm = NULL;
1032 }
1033 }
1034 return osr_nm;
1035 JRT_END
1036
1037 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1038 assert(ProfileInterpreter, "must be profiling interpreter");
1039 int bci = method->bci_from(cur_bcp);
1040 MethodData* mdo = method->method_data();
1041 if (mdo == NULL) return 0;
1042 return mdo->bci_to_di(bci);
1043 JRT_END
1044
1045 #ifdef ASSERT
1046 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1047 assert(ProfileInterpreter, "must be profiling interpreter");
1048
1049 MethodData* mdo = method->method_data();
1050 assert(mdo != NULL, "must not be null");
1051
1052 int bci = method->bci_from(bcp);
1053
1054 address mdp2 = mdo->bci_to_dp(bci);
1055 if (mdp != mdp2) {
1056 ResourceMark rm;
1057 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1058 int current_di = mdo->dp_to_di(mdp);
1059 int expected_di = mdo->dp_to_di(mdp2);
1060 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1061 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1062 int approx_bci = -1;
1063 if (current_di >= 0) {
1064 approx_bci = mdo->data_at(current_di)->bci();
1065 }
1066 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1067 mdo->print_on(tty);
1068 method->print_codes();
1069 }
1070 assert(mdp == mdp2, "wrong mdp");
1071 JRT_END
1072 #endif // ASSERT
1073
1074 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1075 assert(ProfileInterpreter, "must be profiling interpreter");
1076 ResourceMark rm(current);
1077 LastFrameAccessor last_frame(current);
1078 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1079 MethodData* h_mdo = last_frame.method()->method_data();
1080
1081 // Grab a lock to ensure atomic access to setting the return bci and
1082 // the displacement. This can block and GC, invalidating all naked oops.
1083 MutexLocker ml(RetData_lock);
1084
1085 // ProfileData is essentially a wrapper around a derived oop, so we
1086 // need to take the lock before making any ProfileData structures.
1087 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1088 guarantee(data != NULL, "profile data must be valid");
1089 RetData* rdata = data->as_RetData();
1090 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1091 last_frame.set_mdp(new_mdp);
1092 JRT_END
1093
1094 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1095 return Method::build_method_counters(current, m);
1096 JRT_END
1097
1098
1099 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1100 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1101 // stack traversal automatically takes care of preserving arguments for invoke, so
1102 // this is no longer needed.
1103
1104 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1105 // if this is called during a safepoint
1106
1107 if (java_lang_VirtualThread::notify_jvmti_events()) {
1108 JvmtiExport::check_suspend_at_safepoint(current);
1109 }
1110
1111 if (JvmtiExport::should_post_single_step()) {
1112 // This function is called by the interpreter when single stepping. Such single
1113 // stepping could unwind a frame. Then, it is important that we process any frames
1114 // that we might return into.
1115 StackWatermarkSet::before_unwind(current);
1116
1117 // We are called during regular safepoints and when the VM is
1118 // single stepping. If any thread is marked for single stepping,
1119 // then we may have JVMTI work to do.
1120 LastFrameAccessor last_frame(current);
1121 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1122 }
1123 JRT_END
1124
1125 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1126 // This function is called by the interpreter when the return poll found a reason
1127 // to call the VM. The reason could be that we are returning into a not yet safe
1128 // to access frame. We handle that below.
1129 // Note that this path does not check for single stepping, because we do not want
1130 // to single step when unwinding frames for an exception being thrown. Instead,
1131 // such single stepping code will use the safepoint table, which will use the
1132 // InterpreterRuntime::at_safepoint callback.
1133 StackWatermarkSet::before_unwind(current);
1134 JRT_END
1135
1136 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1137 ConstantPoolCacheEntry *cp_entry))
1138
1139 // check the access_flags for the field in the klass
1140
1141 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1142 int index = cp_entry->field_index();
1143 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1144
1145 bool is_static = (obj == NULL);
1146 HandleMark hm(current);
1147
1148 Handle h_obj;
1149 if (!is_static) {
1150 // non-static field accessors have an object, but we need a handle
1151 h_obj = Handle(current, obj);
1152 }
1153 InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1154 jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);
1155 LastFrameAccessor last_frame(current);
1156 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), cp_entry_f1, h_obj, fid);
1157 JRT_END
1158
1159 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1160 ConstantPoolCacheEntry *cp_entry, jvalue *value))
1161
1162 Klass* k = cp_entry->f1_as_klass();
1163
1164 // check the access_flags for the field in the klass
1165 InstanceKlass* ik = InstanceKlass::cast(k);
1166 int index = cp_entry->field_index();
1167 // bail out if field modifications are not watched
1168 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1169
1170 char sig_type = '\0';
1171
1172 switch(cp_entry->flag_state()) {
1173 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1174 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1175 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1176 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1177 case itos: sig_type = JVM_SIGNATURE_INT; break;
1178 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1179 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1180 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1181 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1182 default: ShouldNotReachHere(); return;
1183 }
1184 bool is_static = (obj == NULL);
1185
1186 HandleMark hm(current);
1187 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);
1188 jvalue fvalue;
1189 #ifdef _LP64
1190 fvalue = *value;
1191 #else
1192 // Long/double values are stored unaligned and also noncontiguously with
1193 // tagged stacks. We can't just do a simple assignment even in the non-
1194 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1195 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1196 // We assume that the two halves of longs/doubles are stored in interpreter
1197 // stack slots in platform-endian order.
1198 jlong_accessor u;
1199 jint* newval = (jint*)value;
1200 u.words[0] = newval[0];
1201 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1202 fvalue.j = u.long_value;
1203 #endif // _LP64
1204
1205 Handle h_obj;
1206 if (!is_static) {
1207 // non-static field accessors have an object, but we need a handle
1208 h_obj = Handle(current, obj);
1209 }
1210
1211 LastFrameAccessor last_frame(current);
1212 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1213 fid, sig_type, &fvalue);
1214 JRT_END
1215
1216 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1217 LastFrameAccessor last_frame(current);
1218 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1219 JRT_END
1220
1221
1222 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1223 // before transitioning to VM, and restore it after transitioning back
1224 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1225 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1226 LastFrameAccessor last_frame(current);
1227 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1228 JRT_END
1229
1230 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1231 {
1232 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1233 }
1234 JRT_END
1235
1236
1237 // Implementation of SignatureHandlerLibrary
1238
1239 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1240 // Dummy definition (else normalization method is defined in CPU
1241 // dependant code)
1242 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1243 return fingerprint;
1244 }
1245 #endif
1246
1247 address SignatureHandlerLibrary::set_handler_blob() {
1248 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1249 if (handler_blob == NULL) {
1250 return NULL;
1251 }
1252 address handler = handler_blob->code_begin();
1253 _handler_blob = handler_blob;
1254 _handler = handler;
1255 return handler;
1256 }
1257
1258 void SignatureHandlerLibrary::initialize() {
1259 if (_fingerprints != NULL) {
1260 return;
1261 }
1262 if (set_handler_blob() == NULL) {
1263 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1264 }
1265
1266 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1267 SignatureHandlerLibrary::buffer_size);
1268 _buffer = bb->code_begin();
1269
1270 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, mtCode);
1271 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, mtCode);
1272 }
1273
1274 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1275 address handler = _handler;
1276 int insts_size = buffer->pure_insts_size();
1277 if (handler + insts_size > _handler_blob->code_end()) {
1278 // get a new handler blob
1279 handler = set_handler_blob();
1280 }
1281 if (handler != NULL) {
1282 memcpy(handler, buffer->insts_begin(), insts_size);
1283 pd_set_handler(handler);
1284 ICache::invalidate_range(handler, insts_size);
1285 _handler = handler + insts_size;
1286 }
1287 return handler;
1288 }
1289
1290 void SignatureHandlerLibrary::add(const methodHandle& method) {
1291 if (method->signature_handler() == NULL) {
1292 // use slow signature handler if we can't do better
1293 int handler_index = -1;
1294 // check if we can use customized (fast) signature handler
1295 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1296 // use customized signature handler
1297 MutexLocker mu(SignatureHandlerLibrary_lock);
1298 // make sure data structure is initialized
1299 initialize();
1300 // lookup method signature's fingerprint
1301 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1302 // allow CPU dependant code to optimize the fingerprints for the fast handler
1303 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1304 handler_index = _fingerprints->find(fingerprint);
1305 // create handler if necessary
1306 if (handler_index < 0) {
1307 ResourceMark rm;
1308 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1309 CodeBuffer buffer((address)(_buffer + align_offset),
1310 SignatureHandlerLibrary::buffer_size - align_offset);
1311 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1312 // copy into code heap
1313 address handler = set_handler(&buffer);
1314 if (handler == NULL) {
1315 // use slow signature handler (without memorizing it in the fingerprints)
1316 } else {
1317 // debugging suppport
1318 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1319 ttyLocker ttyl;
1320 tty->cr();
1321 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1322 _handlers->length(),
1323 (method->is_static() ? "static" : "receiver"),
1324 method->name_and_sig_as_C_string(),
1325 fingerprint,
1326 buffer.insts_size());
1327 if (buffer.insts_size() > 0) {
1328 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1329 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1330 }
1331 #ifndef PRODUCT
1332 address rh_begin = Interpreter::result_handler(method()->result_type());
1333 if (CodeCache::contains(rh_begin)) {
1334 // else it might be special platform dependent values
1335 tty->print_cr(" --- associated result handler ---");
1336 address rh_end = rh_begin;
1337 while (*(int*)rh_end != 0) {
1338 rh_end += sizeof(int);
1339 }
1340 Disassembler::decode(rh_begin, rh_end);
1341 } else {
1342 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1343 }
1344 #endif
1345 }
1346 // add handler to library
1347 _fingerprints->append(fingerprint);
1348 _handlers->append(handler);
1349 // set handler index
1350 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1351 handler_index = _fingerprints->length() - 1;
1352 }
1353 }
1354 // Set handler under SignatureHandlerLibrary_lock
1355 if (handler_index < 0) {
1356 // use generic signature handler
1357 method->set_signature_handler(Interpreter::slow_signature_handler());
1358 } else {
1359 // set handler
1360 method->set_signature_handler(_handlers->at(handler_index));
1361 }
1362 } else {
1363 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1364 // use generic signature handler
1365 method->set_signature_handler(Interpreter::slow_signature_handler());
1366 }
1367 }
1368 #ifdef ASSERT
1369 int handler_index = -1;
1370 int fingerprint_index = -2;
1371 {
1372 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1373 // in any way if accessed from multiple threads. To avoid races with another
1374 // thread which may change the arrays in the above, mutex protected block, we
1375 // have to protect this read access here with the same mutex as well!
1376 MutexLocker mu(SignatureHandlerLibrary_lock);
1377 if (_handlers != NULL) {
1378 handler_index = _handlers->find(method->signature_handler());
1379 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1380 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1381 fingerprint_index = _fingerprints->find(fingerprint);
1382 }
1383 }
1384 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1385 handler_index == fingerprint_index, "sanity check");
1386 #endif // ASSERT
1387 }
1388
1389 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1390 int handler_index = -1;
1391 // use customized signature handler
1392 MutexLocker mu(SignatureHandlerLibrary_lock);
1393 // make sure data structure is initialized
1394 initialize();
1395 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1396 handler_index = _fingerprints->find(fingerprint);
1397 // create handler if necessary
1398 if (handler_index < 0) {
1399 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1400 tty->cr();
1401 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1402 _handlers->length(),
1403 p2i(handler),
1404 fingerprint);
1405 }
1406 _fingerprints->append(fingerprint);
1407 _handlers->append(handler);
1408 } else {
1409 if (PrintSignatureHandlers) {
1410 tty->cr();
1411 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1412 _handlers->length(),
1413 fingerprint,
1414 p2i(_handlers->at(handler_index)),
1415 p2i(handler));
1416 }
1417 }
1418 }
1419
1420
1421 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1422 address SignatureHandlerLibrary::_handler = NULL;
1423 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1424 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1425 address SignatureHandlerLibrary::_buffer = NULL;
1426
1427
1428 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1429 methodHandle m(current, method);
1430 assert(m->is_native(), "sanity check");
1431 // lookup native function entry point if it doesn't exist
1432 if (!m->has_native_function()) {
1433 NativeLookup::lookup(m, CHECK);
1434 }
1435 // make sure signature handler is installed
1436 SignatureHandlerLibrary::add(m);
1437 // The interpreter entry point checks the signature handler first,
1438 // before trying to fetch the native entry point and klass mirror.
1439 // We must set the signature handler last, so that multiple processors
1440 // preparing the same method will be sure to see non-null entry & mirror.
1441 JRT_END
1442
1443 #if defined(IA32) || defined(AMD64) || defined(ARM)
1444 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1445 if (src_address == dest_address) {
1446 return;
1447 }
1448 ResourceMark rm;
1449 LastFrameAccessor last_frame(current);
1450 assert(last_frame.is_interpreted_frame(), "");
1451 jint bci = last_frame.bci();
1452 methodHandle mh(current, last_frame.method());
1453 Bytecode_invoke invoke(mh, bci);
1454 ArgumentSizeComputer asc(invoke.signature());
1455 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1456 Copy::conjoint_jbytes(src_address, dest_address,
1457 size_of_arguments * Interpreter::stackElementSize);
1458 JRT_END
1459 #endif
1460
1461 #if INCLUDE_JVMTI
1462 // This is a support of the JVMTI PopFrame interface.
1463 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1464 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1465 // The member_name argument is a saved reference (in local#0) to the member_name.
1466 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1467 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1468 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1469 Method* method, address bcp))
1470 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1471 if (code != Bytecodes::_invokestatic) {
1472 return;
1473 }
1474 ConstantPool* cpool = method->constants();
1475 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1476 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1477 Symbol* mname = cpool->name_ref_at(cp_index);
1478
1479 if (MethodHandles::has_member_arg(cname, mname)) {
1480 oop member_name_oop = cast_to_oop(member_name);
1481 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1482 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1483 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1484 }
1485 current->set_vm_result(member_name_oop);
1486 } else {
1487 current->set_vm_result(NULL);
1488 }
1489 JRT_END
1490 #endif // INCLUDE_JVMTI
1491
1492 #ifndef PRODUCT
1493 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1494 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1495 // The generated code still uses call_VM because that will set up the frame pointer for
1496 // bcp and method.
1497 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1498 LastFrameAccessor last_frame(current);
1499 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1500 methodHandle mh(current, last_frame.method());
1501 BytecodeTracer::trace(mh, last_frame.bcp(), tos, tos2);
1502 return preserve_this_value;
1503 JRT_END
1504 #endif // !PRODUCT