1 /*
2 * Copyright (c) 1997, 2020, 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/systemDictionary.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/interpreter.hpp"
37 #include "interpreter/interpreterRuntime.hpp"
38 #include "interpreter/linkResolver.hpp"
39 #include "interpreter/templateTable.hpp"
40 #include "logging/log.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/constantPool.hpp"
45 #include "oops/cpCache.inline.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/methodData.hpp"
48 #include "oops/objArrayKlass.hpp"
49 #include "oops/objArrayOop.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "oops/symbol.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/nativeLookup.hpp"
54 #include "runtime/atomic.hpp"
55 #include "runtime/biasedLocking.hpp"
56 #include "runtime/deoptimization.hpp"
57 #include "runtime/fieldDescriptor.inline.hpp"
58 #include "runtime/frame.inline.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/icache.hpp"
61 #include "runtime/interfaceSupport.inline.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/jfieldIDWorkaround.hpp"
65 #include "runtime/osThread.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/stubRoutines.hpp"
68 #include "runtime/synchronizer.hpp"
69 #include "runtime/threadCritical.hpp"
70 #include "utilities/align.hpp"
71 #include "utilities/copy.hpp"
72 #include "utilities/events.hpp"
73 #ifdef COMPILER2
74 #include "opto/runtime.hpp"
75 #endif
76
77 class UnlockFlagSaver {
78 private:
79 JavaThread* _thread;
80 bool _do_not_unlock;
81 public:
82 UnlockFlagSaver(JavaThread* t) {
83 _thread = t;
84 _do_not_unlock = t->do_not_unlock_if_synchronized();
85 t->set_do_not_unlock_if_synchronized(false);
86 }
87 ~UnlockFlagSaver() {
88 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
89 }
90 };
91
92 // Helper class to access current interpreter state
93 class LastFrameAccessor : public StackObj {
94 frame _last_frame;
95 public:
96 LastFrameAccessor(JavaThread* thread) {
97 assert(thread == Thread::current(), "sanity");
98 _last_frame = thread->last_frame();
99 }
100 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
101 Method* method() const { return _last_frame.interpreter_frame_method(); }
102 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
103 int bci() const { return _last_frame.interpreter_frame_bci(); }
104 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
105
106 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
107 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
108
109 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
110 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
111
112 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
113 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
114 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
115 int get_index_u2_cpcache(Bytecodes::Code bc) const
116 { return bytecode().get_index_u2_cpcache(bc); }
117 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
118 int number_of_dimensions() const { return bcp()[3]; }
119 ConstantPoolCacheEntry* cache_entry_at(int i) const
120 { return method()->constants()->cache()->entry_at(i); }
121 ConstantPoolCacheEntry* cache_entry() const { return cache_entry_at(Bytes::get_native_u2(bcp() + 1)); }
122
123 oop callee_receiver(Symbol* signature) {
124 return _last_frame.interpreter_callee_receiver(signature);
125 }
126 BasicObjectLock* monitor_begin() const {
127 return _last_frame.interpreter_frame_monitor_begin();
128 }
129 BasicObjectLock* monitor_end() const {
130 return _last_frame.interpreter_frame_monitor_end();
131 }
132 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
133 return _last_frame.next_monitor_in_interpreter_frame(current);
134 }
135
136 frame& get_frame() { return _last_frame; }
137 };
138
139 //------------------------------------------------------------------------------------------------------------------------
140 // State accessors
141
142 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
143 LastFrameAccessor last_frame(thread);
144 last_frame.set_bcp(bcp);
145 if (ProfileInterpreter) {
146 // ProfileTraps uses MDOs independently of ProfileInterpreter.
147 // That is why we must check both ProfileInterpreter and mdo != NULL.
148 MethodData* mdo = last_frame.method()->method_data();
149 if (mdo != NULL) {
150 NEEDS_CLEANUP;
151 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
152 }
153 }
154 }
155
156 //------------------------------------------------------------------------------------------------------------------------
157 // Constants
158
159
160 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
161 // access constant pool
162 LastFrameAccessor last_frame(thread);
163 ConstantPool* pool = last_frame.method()->constants();
164 int index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
165 constantTag tag = pool->tag_at(index);
166
167 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
168 Klass* klass = pool->klass_at(index, CHECK);
169 oop java_class = klass->java_mirror();
170 thread->set_vm_result(java_class);
171 JRT_END
172
173 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
174 assert(bytecode == Bytecodes::_ldc ||
175 bytecode == Bytecodes::_ldc_w ||
176 bytecode == Bytecodes::_ldc2_w ||
177 bytecode == Bytecodes::_fast_aldc ||
178 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
179 ResourceMark rm(thread);
180 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
181 bytecode == Bytecodes::_fast_aldc_w);
182 LastFrameAccessor last_frame(thread);
183 methodHandle m (thread, last_frame.method());
184 Bytecode_loadconstant ldc(m, last_frame.bci());
185
186 // Double-check the size. (Condy can have any type.)
187 BasicType type = ldc.result_type();
188 switch (type2size[type]) {
189 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
190 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
191 default: ShouldNotReachHere();
192 }
193
194 // Resolve the constant. This does not do unboxing.
195 // But it does replace Universe::the_null_sentinel by null.
196 oop result = ldc.resolve_constant(CHECK);
197 assert(result != NULL || is_fast_aldc, "null result only valid for fast_aldc");
198
199 #ifdef ASSERT
200 {
201 // The bytecode wrappers aren't GC-safe so construct a new one
202 Bytecode_loadconstant ldc2(m, last_frame.bci());
203 int rindex = ldc2.cache_index();
204 if (rindex < 0)
205 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
206 if (rindex >= 0) {
207 oop coop = m->constants()->resolved_references()->obj_at(rindex);
208 oop roop = (result == NULL ? Universe::the_null_sentinel() : result);
209 assert(roop == coop, "expected result for assembly code");
210 }
211 }
212 #endif
213 thread->set_vm_result(result);
214 if (!is_fast_aldc) {
215 // Tell the interpreter how to unbox the primitive.
216 guarantee(java_lang_boxing_object::is_instance(result, type), "");
217 int offset = java_lang_boxing_object::value_offset_in_bytes(type);
218 intptr_t flags = ((as_TosState(type) << ConstantPoolCacheEntry::tos_state_shift)
219 | (offset & ConstantPoolCacheEntry::field_index_mask));
220 thread->set_vm_result_2((Metadata*)flags);
221 }
222 }
223 JRT_END
224
225
226 //------------------------------------------------------------------------------------------------------------------------
227 // Allocation
228
229 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
230 Klass* k = pool->klass_at(index, CHECK);
231 InstanceKlass* klass = InstanceKlass::cast(k);
232
233 // Make sure we are not instantiating an abstract klass
234 klass->check_valid_for_instantiation(true, CHECK);
235
236 // Make sure klass is initialized
237 klass->initialize(CHECK);
238
239 // At this point the class may not be fully initialized
240 // because of recursive initialization. If it is fully
241 // initialized & has_finalized is not set, we rewrite
242 // it into its fast version (Note: no locking is needed
243 // here since this is an atomic byte write and can be
244 // done more than once).
245 //
246 // Note: In case of classes with has_finalized we don't
247 // rewrite since that saves us an extra check in
248 // the fast version which then would call the
249 // slow version anyway (and do a call back into
250 // Java).
251 // If we have a breakpoint, then we don't rewrite
252 // because the _breakpoint bytecode would be lost.
253 oop obj = klass->allocate_instance(CHECK);
254 thread->set_vm_result(obj);
255 JRT_END
256
257
258 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
259 oop obj = oopFactory::new_typeArray(type, size, CHECK);
260 thread->set_vm_result(obj);
261 JRT_END
262
263
264 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
265 Klass* klass = pool->klass_at(index, CHECK);
266 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
267 thread->set_vm_result(obj);
268 JRT_END
269
270
271 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
272 // We may want to pass in more arguments - could make this slightly faster
273 LastFrameAccessor last_frame(thread);
274 ConstantPool* constants = last_frame.method()->constants();
275 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
276 Klass* klass = constants->klass_at(i, CHECK);
277 int nof_dims = last_frame.number_of_dimensions();
278 assert(klass->is_klass(), "not a class");
279 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
280
281 // We must create an array of jints to pass to multi_allocate.
282 ResourceMark rm(thread);
283 const int small_dims = 10;
284 jint dim_array[small_dims];
285 jint *dims = &dim_array[0];
286 if (nof_dims > small_dims) {
287 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
288 }
289 for (int index = 0; index < nof_dims; index++) {
290 // offset from first_size_address is addressed as local[index]
291 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
292 dims[index] = first_size_address[n];
293 }
294 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
295 thread->set_vm_result(obj);
296 JRT_END
297
298
299 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
300 assert(oopDesc::is_oop(obj), "must be a valid oop");
301 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
302 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
303 JRT_END
304
305
306 // Quicken instance-of and check-cast bytecodes
307 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
308 // Force resolving; quicken the bytecode
309 LastFrameAccessor last_frame(thread);
310 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
311 ConstantPool* cpool = last_frame.method()->constants();
312 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
313 // program we might have seen an unquick'd bytecode in the interpreter but have another
314 // thread quicken the bytecode before we get here.
315 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
316 Klass* klass = cpool->klass_at(which, CHECK);
317 thread->set_vm_result_2(klass);
318 JRT_END
319
320
321 //------------------------------------------------------------------------------------------------------------------------
322 // Exceptions
323
324 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
325 const methodHandle& trap_method, int trap_bci, TRAPS) {
326 if (trap_method.not_null()) {
327 MethodData* trap_mdo = trap_method->method_data();
328 if (trap_mdo == NULL) {
329 Method::build_interpreter_method_data(trap_method, THREAD);
330 if (HAS_PENDING_EXCEPTION) {
331 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
332 "we expect only an OOM error here");
333 CLEAR_PENDING_EXCEPTION;
334 }
335 trap_mdo = trap_method->method_data();
336 // and fall through...
337 }
338 if (trap_mdo != NULL) {
339 // Update per-method count of trap events. The interpreter
340 // is updating the MDO to simulate the effect of compiler traps.
341 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
342 }
343 }
344 }
345
346 // Assume the compiler is (or will be) interested in this event.
347 // If necessary, create an MDO to hold the information, and record it.
348 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
349 assert(ProfileTraps, "call me only if profiling");
350 LastFrameAccessor last_frame(thread);
351 methodHandle trap_method(thread, last_frame.method());
352 int trap_bci = trap_method->bci_from(last_frame.bcp());
353 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
354 }
355
356 #ifdef CC_INTERP
357 // As legacy note_trap, but we have more arguments.
358 JRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
359 methodHandle trap_method(thread, method);
360 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
361 JRT_END
362
363 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
364 // for each exception.
365 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
366 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
367 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
368 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
369 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
370 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
371 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
372 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
373 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
374 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
375 #endif // CC_INTERP
376
377
378 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
379 // get klass
380 InstanceKlass* klass = InstanceKlass::cast(k);
381 assert(klass->is_initialized(),
382 "this klass should have been initialized during VM initialization");
383 // create instance - do not call constructor since we may have no
384 // (java) stack space left (should assert constructor is empty)
385 Handle exception;
386 oop exception_oop = klass->allocate_instance(CHECK_(exception));
387 exception = Handle(THREAD, exception_oop);
388 if (StackTraceInThrowable) {
389 java_lang_Throwable::fill_in_stack_trace(exception);
390 }
391 return exception;
392 }
393
394 // Special handling for stack overflow: since we don't have any (java) stack
395 // space left we use the pre-allocated & pre-initialized StackOverflowError
396 // klass to create an stack overflow error instance. We do not call its
397 // constructor for the same reason (it is empty, anyway).
398 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
399 Handle exception = get_preinitialized_exception(
400 SystemDictionary::StackOverflowError_klass(),
401 CHECK);
402 // Increment counter for hs_err file reporting
403 Atomic::inc(&Exceptions::_stack_overflow_errors);
404 THROW_HANDLE(exception);
405 JRT_END
406
407 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
408 Handle exception = get_preinitialized_exception(
409 SystemDictionary::StackOverflowError_klass(),
410 CHECK);
411 java_lang_Throwable::set_message(exception(),
412 Universe::delayed_stack_overflow_error_message());
413 // Increment counter for hs_err file reporting
414 Atomic::inc(&Exceptions::_stack_overflow_errors);
415 THROW_HANDLE(exception);
416 JRT_END
417
418 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
419 // lookup exception klass
420 TempNewSymbol s = SymbolTable::new_symbol(name);
421 if (ProfileTraps) {
422 if (s == vmSymbols::java_lang_ArithmeticException()) {
423 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
424 } else if (s == vmSymbols::java_lang_NullPointerException()) {
425 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
426 }
427 }
428 // create exception
429 Handle exception = Exceptions::new_exception(thread, s, message);
430 thread->set_vm_result(exception());
431 JRT_END
432
433
434 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
435 // Produce the error message first because note_trap can safepoint
436 ResourceMark rm(thread);
437 const char* klass_name = obj->klass()->external_name();
438 // lookup exception klass
439 TempNewSymbol s = SymbolTable::new_symbol(name);
440 if (ProfileTraps) {
441 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
442 }
443 // create exception, with klass name as detail message
444 Handle exception = Exceptions::new_exception(thread, s, klass_name);
445 thread->set_vm_result(exception());
446 JRT_END
447
448 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, arrayOopDesc* a, jint index))
449 // Produce the error message first because note_trap can safepoint
450 ResourceMark rm(thread);
451 stringStream ss;
452 ss.print("Index %d out of bounds for length %d", index, a->length());
453
454 if (ProfileTraps) {
455 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
456 }
457
458 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
459 JRT_END
460
461 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
462 JavaThread* thread, oopDesc* obj))
463
464 // Produce the error message first because note_trap can safepoint
465 ResourceMark rm(thread);
466 char* message = SharedRuntime::generate_class_cast_message(
467 thread, obj->klass());
468
469 if (ProfileTraps) {
470 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
471 }
472
473 // create exception
474 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
475 JRT_END
476
477 // exception_handler_for_exception(...) returns the continuation address,
478 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
479 // The exception oop is returned to make sure it is preserved over GC (it
480 // is only on the stack if the exception was thrown explicitly via athrow).
481 // During this operation, the expression stack contains the values for the
482 // bci where the exception happened. If the exception was propagated back
483 // from a call, the expression stack contains the values for the bci at the
484 // invoke w/o arguments (i.e., as if one were inside the call).
485 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
486
487 LastFrameAccessor last_frame(thread);
488 Handle h_exception(thread, exception);
489 methodHandle h_method (thread, last_frame.method());
490 constantPoolHandle h_constants(thread, h_method->constants());
491 bool should_repeat;
492 int handler_bci;
493 int current_bci = last_frame.bci();
494
495 if (thread->frames_to_pop_failed_realloc() > 0) {
496 // Allocation of scalar replaced object used in this frame
497 // failed. Unconditionally pop the frame.
498 thread->dec_frames_to_pop_failed_realloc();
499 thread->set_vm_result(h_exception());
500 // If the method is synchronized we already unlocked the monitor
501 // during deoptimization so the interpreter needs to skip it when
502 // the frame is popped.
503 thread->set_do_not_unlock_if_synchronized(true);
504 #ifdef CC_INTERP
505 return (address) -1;
506 #else
507 return Interpreter::remove_activation_entry();
508 #endif
509 }
510
511 // Need to do this check first since when _do_not_unlock_if_synchronized
512 // is set, we don't want to trigger any classloading which may make calls
513 // into java, or surprisingly find a matching exception handler for bci 0
514 // since at this moment the method hasn't been "officially" entered yet.
515 if (thread->do_not_unlock_if_synchronized()) {
516 ResourceMark rm;
517 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
518 thread->set_vm_result(exception);
519 #ifdef CC_INTERP
520 return (address) -1;
521 #else
522 return Interpreter::remove_activation_entry();
523 #endif
524 }
525
526 do {
527 should_repeat = false;
528
529 // assertions
530 #ifdef ASSERT
531 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
532 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
533 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
534 if (ExitVMOnVerifyError) vm_exit(-1);
535 ShouldNotReachHere();
536 }
537 #endif
538
539 // tracing
540 if (log_is_enabled(Info, exceptions)) {
541 ResourceMark rm(thread);
542 stringStream tempst;
543 tempst.print("interpreter method <%s>\n"
544 " at bci %d for thread " INTPTR_FORMAT " (%s)",
545 h_method->print_value_string(), current_bci, p2i(thread), thread->name());
546 Exceptions::log_exception(h_exception, tempst.as_string());
547 }
548 // Don't go paging in something which won't be used.
549 // else if (extable->length() == 0) {
550 // // disabled for now - interpreter is not using shortcut yet
551 // // (shortcut is not to call runtime if we have no exception handlers)
552 // // warning("performance bug: should not call runtime if method has no exception handlers");
553 // }
554 // for AbortVMOnException flag
555 Exceptions::debug_check_abort(h_exception);
556
557 // exception handler lookup
558 Klass* klass = h_exception->klass();
559 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
560 if (HAS_PENDING_EXCEPTION) {
561 // We threw an exception while trying to find the exception handler.
562 // Transfer the new exception to the exception handle which will
563 // be set into thread local storage, and do another lookup for an
564 // exception handler for this exception, this time starting at the
565 // BCI of the exception handler which caused the exception to be
566 // thrown (bug 4307310).
567 h_exception = Handle(THREAD, PENDING_EXCEPTION);
568 CLEAR_PENDING_EXCEPTION;
569 if (handler_bci >= 0) {
570 current_bci = handler_bci;
571 should_repeat = true;
572 }
573 }
574 } while (should_repeat == true);
575
576 #if INCLUDE_JVMCI
577 if (EnableJVMCI && h_method->method_data() != NULL) {
578 ResourceMark rm(thread);
579 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);
580 if (pdata != NULL && pdata->is_BitData()) {
581 BitData* bit_data = (BitData*) pdata;
582 bit_data->set_exception_seen();
583 }
584 }
585 #endif
586
587 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
588 // time throw or a stack unwinding throw and accordingly notify the debugger
589 if (JvmtiExport::can_post_on_exceptions()) {
590 JvmtiExport::post_exception_throw(thread, h_method(), last_frame.bcp(), h_exception());
591 }
592
593 #ifdef CC_INTERP
594 address continuation = (address)(intptr_t) handler_bci;
595 #else
596 address continuation = NULL;
597 #endif
598 address handler_pc = NULL;
599 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
600 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
601 // handler in this method, or (b) after a stack overflow there is not yet
602 // enough stack space available to reprotect the stack.
603 #ifndef CC_INTERP
604 continuation = Interpreter::remove_activation_entry();
605 #endif
606 #if COMPILER2_OR_JVMCI
607 // Count this for compilation purposes
608 h_method->interpreter_throwout_increment(THREAD);
609 #endif
610 } else {
611 // handler in this method => change bci/bcp to handler bci/bcp and continue there
612 handler_pc = h_method->code_base() + handler_bci;
613 #ifndef CC_INTERP
614 set_bcp_and_mdp(handler_pc, thread);
615 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
616 #endif
617 }
618 // notify debugger of an exception catch
619 // (this is good for exceptions caught in native methods as well)
620 if (JvmtiExport::can_post_on_exceptions()) {
621 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
622 }
623
624 thread->set_vm_result(h_exception());
625 return continuation;
626 JRT_END
627
628
629 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
630 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
631 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
632 JRT_END
633
634
635 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
636 THROW(vmSymbols::java_lang_AbstractMethodError());
637 JRT_END
638
639 // This method is called from the "abstract_entry" of the interpreter.
640 // At that point, the arguments have already been removed from the stack
641 // and therefore we don't have the receiver object at our fingertips. (Though,
642 // on some platforms the receiver still resides in a register...). Thus,
643 // we have no choice but print an error message not containing the receiver
644 // type.
645 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* thread,
646 Method* missingMethod))
647 ResourceMark rm(thread);
648 assert(missingMethod != NULL, "sanity");
649 methodHandle m(thread, missingMethod);
650 LinkResolver::throw_abstract_method_error(m, THREAD);
651 JRT_END
652
653 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* thread,
654 Klass* recvKlass,
655 Method* missingMethod))
656 ResourceMark rm(thread);
657 methodHandle mh = methodHandle(thread, missingMethod);
658 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
659 JRT_END
660
661
662 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
663 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
664 JRT_END
665
666 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* thread,
667 Klass* recvKlass,
668 Klass* interfaceKlass))
669 ResourceMark rm(thread);
670 char buf[1000];
671 buf[0] = '\0';
672 jio_snprintf(buf, sizeof(buf),
673 "Class %s does not implement the requested interface %s",
674 recvKlass ? recvKlass->external_name() : "NULL",
675 interfaceKlass ? interfaceKlass->external_name() : "NULL");
676 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
677 JRT_END
678
679 //------------------------------------------------------------------------------------------------------------------------
680 // Fields
681 //
682
683 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) {
684 Thread* THREAD = thread;
685 // resolve field
686 fieldDescriptor info;
687 LastFrameAccessor last_frame(thread);
688 constantPoolHandle pool(thread, last_frame.method()->constants());
689 methodHandle m(thread, last_frame.method());
690 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
691 bytecode == Bytecodes::_putstatic);
692 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
693
694 {
695 JvmtiHideSingleStepping jhss(thread);
696 LinkResolver::resolve_field_access(info, pool, last_frame.get_index_u2_cpcache(bytecode),
697 m, bytecode, CHECK);
698 } // end JvmtiHideSingleStepping
699
700 // check if link resolution caused cpCache to be updated
701 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
702 if (cp_cache_entry->is_resolved(bytecode)) return;
703
704 // compute auxiliary field attributes
705 TosState state = as_TosState(info.field_type());
706
707 // Resolution of put instructions on final fields is delayed. That is required so that
708 // exceptions are thrown at the correct place (when the instruction is actually invoked).
709 // If we do not resolve an instruction in the current pass, leaving the put_code
710 // set to zero will cause the next put instruction to the same field to reresolve.
711
712 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
713 // to final instance fields with updates originating from a method different than <init>)
714 // is inhibited. A putfield instruction targeting an instance final field must throw
715 // an IllegalAccessError if the instruction is not in an instance
716 // initializer method <init>. If resolution were not inhibited, a putfield
717 // in an initializer method could be resolved in the initializer. Subsequent
718 // putfield instructions to the same field would then use cached information.
719 // As a result, those instructions would not pass through the VM. That is,
720 // checks in resolve_field_access() would not be executed for those instructions
721 // and the required IllegalAccessError would not be thrown.
722 //
723 // Also, we need to delay resolving getstatic and putstatic instructions until the
724 // class is initialized. This is required so that access to the static
725 // field will call the initialization function every time until the class
726 // is completely initialized ala. in 2.17.5 in JVM Specification.
727 InstanceKlass* klass = info.field_holder();
728 bool uninitialized_static = is_static && !klass->is_initialized();
729 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
730 info.has_initialized_final_update();
731 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
732
733 Bytecodes::Code get_code = (Bytecodes::Code)0;
734 Bytecodes::Code put_code = (Bytecodes::Code)0;
735 if (!uninitialized_static) {
736 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
737 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
738 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
739 }
740 }
741
742 cp_cache_entry->set_field(
743 get_code,
744 put_code,
745 info.field_holder(),
746 info.index(),
747 info.offset(),
748 state,
749 info.access_flags().is_final(),
750 info.access_flags().is_volatile(),
751 pool->pool_holder()
752 );
753 }
754
755
756 //------------------------------------------------------------------------------------------------------------------------
757 // Synchronization
758 //
759 // The interpreter's synchronization code is factored out so that it can
760 // be shared by method invocation and synchronized blocks.
761 //%note synchronization_3
762
763 //%note monitor_1
764 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
765 #ifdef ASSERT
766 thread->last_frame().interpreter_frame_verify_monitor(elem);
767 #endif
768 if (PrintBiasedLockingStatistics) {
769 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
770 }
771 Handle h_obj(thread, elem->obj());
772 assert(Universe::heap()->is_in_or_null(h_obj()),
773 "must be NULL or an object");
774 ObjectSynchronizer::enter(h_obj, elem->lock(), CHECK);
775 assert(Universe::heap()->is_in_or_null(elem->obj()),
776 "must be NULL or an object");
777 #ifdef ASSERT
778 thread->last_frame().interpreter_frame_verify_monitor(elem);
779 #endif
780 JRT_END
781
782
783 //%note monitor_1
784 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
785 #ifdef ASSERT
786 thread->last_frame().interpreter_frame_verify_monitor(elem);
787 #endif
788 Handle h_obj(thread, elem->obj());
789 assert(Universe::heap()->is_in_or_null(h_obj()),
790 "must be NULL or an object");
791 if (elem == NULL || h_obj()->is_unlocked()) {
792 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
793 }
794 ObjectSynchronizer::exit(h_obj(), elem->lock(), thread);
795 // Free entry. This must be done here, since a pending exception might be installed on
796 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
797 elem->set_obj(NULL);
798 #ifdef ASSERT
799 thread->last_frame().interpreter_frame_verify_monitor(elem);
800 #endif
801 JRT_END
802
803
804 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
805 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
806 JRT_END
807
808
809 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
810 // Returns an illegal exception to install into the current thread. The
811 // pending_exception flag is cleared so normal exception handling does not
812 // trigger. Any current installed exception will be overwritten. This
813 // method will be called during an exception unwind.
814
815 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
816 Handle exception(thread, thread->vm_result());
817 assert(exception() != NULL, "vm result should be set");
818 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
819 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
820 exception = get_preinitialized_exception(
821 SystemDictionary::IllegalMonitorStateException_klass(),
822 CATCH);
823 }
824 thread->set_vm_result(exception());
825 JRT_END
826
827
828 //------------------------------------------------------------------------------------------------------------------------
829 // Invokes
830
831 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
832 return method->orig_bytecode_at(method->bci_from(bcp));
833 JRT_END
834
835 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
836 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
837 JRT_END
838
839 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
840 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
841 JRT_END
842
843 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) {
844 Thread* THREAD = thread;
845 LastFrameAccessor last_frame(thread);
846 // extract receiver from the outgoing argument list if necessary
847 Handle receiver(thread, NULL);
848 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
849 bytecode == Bytecodes::_invokespecial) {
850 ResourceMark rm(thread);
851 methodHandle m (thread, last_frame.method());
852 Bytecode_invoke call(m, last_frame.bci());
853 Symbol* signature = call.signature();
854 receiver = Handle(thread, last_frame.callee_receiver(signature));
855
856 assert(Universe::heap()->is_in_or_null(receiver()),
857 "sanity check");
858 assert(receiver.is_null() ||
859 !Universe::heap()->is_in(receiver->klass()),
860 "sanity check");
861 }
862
863 // resolve method
864 CallInfo info;
865 constantPoolHandle pool(thread, last_frame.method()->constants());
866
867 {
868 JvmtiHideSingleStepping jhss(thread);
869 LinkResolver::resolve_invoke(info, receiver, pool,
870 last_frame.get_index_u2_cpcache(bytecode), bytecode,
871 CHECK);
872 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
873 int retry_count = 0;
874 while (info.resolved_method()->is_old()) {
875 // It is very unlikely that method is redefined more than 100 times
876 // in the middle of resolve. If it is looping here more than 100 times
877 // means then there could be a bug here.
878 guarantee((retry_count++ < 100),
879 "Could not resolve to latest version of redefined method");
880 // method is redefined in the middle of resolve so re-try.
881 LinkResolver::resolve_invoke(info, receiver, pool,
882 last_frame.get_index_u2_cpcache(bytecode), bytecode,
883 CHECK);
884 }
885 }
886 } // end JvmtiHideSingleStepping
887
888 // check if link resolution caused cpCache to be updated
889 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
890 if (cp_cache_entry->is_resolved(bytecode)) return;
891
892 #ifdef ASSERT
893 if (bytecode == Bytecodes::_invokeinterface) {
894 if (info.resolved_method()->method_holder() ==
895 SystemDictionary::Object_klass()) {
896 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
897 // (see also CallInfo::set_interface for details)
898 assert(info.call_kind() == CallInfo::vtable_call ||
899 info.call_kind() == CallInfo::direct_call, "");
900 Method* rm = info.resolved_method();
901 assert(rm->is_final() || info.has_vtable_index(),
902 "should have been set already");
903 } else if (!info.resolved_method()->has_itable_index()) {
904 // Resolved something like CharSequence.toString. Use vtable not itable.
905 assert(info.call_kind() != CallInfo::itable_call, "");
906 } else {
907 // Setup itable entry
908 assert(info.call_kind() == CallInfo::itable_call, "");
909 int index = info.resolved_method()->itable_index();
910 assert(info.itable_index() == index, "");
911 }
912 } else if (bytecode == Bytecodes::_invokespecial) {
913 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
914 } else {
915 assert(info.call_kind() == CallInfo::direct_call ||
916 info.call_kind() == CallInfo::vtable_call, "");
917 }
918 #endif
919 // Get sender or sender's unsafe_anonymous_host, and only set cpCache entry to resolved if
920 // it is not an interface. The receiver for invokespecial calls within interface
921 // methods must be checked for every call.
922 InstanceKlass* sender = pool->pool_holder();
923 sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender;
924 methodHandle resolved_method(THREAD, info.resolved_method());
925
926 switch (info.call_kind()) {
927 case CallInfo::direct_call:
928 cp_cache_entry->set_direct_call(
929 bytecode,
930 resolved_method,
931 sender->is_interface());
932 break;
933 case CallInfo::vtable_call:
934 cp_cache_entry->set_vtable_call(
935 bytecode,
936 resolved_method,
937 info.vtable_index());
938 break;
939 case CallInfo::itable_call:
940 cp_cache_entry->set_itable_call(
941 bytecode,
942 info.resolved_klass(),
943 resolved_method,
944 info.itable_index());
945 break;
946 default: ShouldNotReachHere();
947 }
948 }
949
950
951 // First time execution: Resolve symbols, create a permanent MethodType object.
952 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) {
953 Thread* THREAD = thread;
954 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
955 LastFrameAccessor last_frame(thread);
956
957 // resolve method
958 CallInfo info;
959 constantPoolHandle pool(thread, last_frame.method()->constants());
960 {
961 JvmtiHideSingleStepping jhss(thread);
962 LinkResolver::resolve_invoke(info, Handle(), pool,
963 last_frame.get_index_u2_cpcache(bytecode), bytecode,
964 CHECK);
965 } // end JvmtiHideSingleStepping
966
967 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
968 cp_cache_entry->set_method_handle(pool, info);
969 }
970
971 // First time execution: Resolve symbols, create a permanent CallSite object.
972 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) {
973 Thread* THREAD = thread;
974 LastFrameAccessor last_frame(thread);
975 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
976
977 // resolve method
978 CallInfo info;
979 constantPoolHandle pool(thread, last_frame.method()->constants());
980 int index = last_frame.get_index_u4(bytecode);
981 {
982 JvmtiHideSingleStepping jhss(thread);
983 LinkResolver::resolve_invoke(info, Handle(), pool,
984 index, bytecode, CHECK);
985 } // end JvmtiHideSingleStepping
986
987 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
988 cp_cache_entry->set_dynamic_call(pool, info);
989 }
990
991 // This function is the interface to the assembly code. It returns the resolved
992 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
993 // This function will check for redefinition!
994 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) {
995 switch (bytecode) {
996 case Bytecodes::_getstatic:
997 case Bytecodes::_putstatic:
998 case Bytecodes::_getfield:
999 case Bytecodes::_putfield:
1000 resolve_get_put(thread, bytecode);
1001 break;
1002 case Bytecodes::_invokevirtual:
1003 case Bytecodes::_invokespecial:
1004 case Bytecodes::_invokestatic:
1005 case Bytecodes::_invokeinterface:
1006 resolve_invoke(thread, bytecode);
1007 break;
1008 case Bytecodes::_invokehandle:
1009 resolve_invokehandle(thread);
1010 break;
1011 case Bytecodes::_invokedynamic:
1012 resolve_invokedynamic(thread);
1013 break;
1014 default:
1015 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1016 break;
1017 }
1018 }
1019 JRT_END
1020
1021 //------------------------------------------------------------------------------------------------------------------------
1022 // Miscellaneous
1023
1024
1025 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
1026 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
1027 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
1028 if (branch_bcp != NULL && nm != NULL) {
1029 // This was a successful request for an OSR nmethod. Because
1030 // frequency_counter_overflow_inner ends with a safepoint check,
1031 // nm could have been unloaded so look it up again. It's unsafe
1032 // to examine nm directly since it might have been freed and used
1033 // for something else.
1034 LastFrameAccessor last_frame(thread);
1035 Method* method = last_frame.method();
1036 int bci = method->bci_from(last_frame.bcp());
1037 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1038 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1039 if (nm != NULL && bs_nm != NULL) {
1040 // in case the transition passed a safepoint we need to barrier this again
1041 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1042 nm = NULL;
1043 }
1044 }
1045 }
1046 if (nm != NULL && thread->is_interp_only_mode()) {
1047 // Normally we never get an nm if is_interp_only_mode() is true, because
1048 // policy()->event has a check for this and won't compile the method when
1049 // true. However, it's possible for is_interp_only_mode() to become true
1050 // during the compilation. We don't want to return the nm in that case
1051 // because we want to continue to execute interpreted.
1052 nm = NULL;
1053 }
1054 #ifndef PRODUCT
1055 if (TraceOnStackReplacement) {
1056 if (nm != NULL) {
1057 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1058 nm->print();
1059 }
1060 }
1061 #endif
1062 return nm;
1063 }
1064
1065 JRT_ENTRY(nmethod*,
1066 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
1067 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1068 // flag, in case this method triggers classloading which will call into Java.
1069 UnlockFlagSaver fs(thread);
1070
1071 LastFrameAccessor last_frame(thread);
1072 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1073 methodHandle method(thread, last_frame.method());
1074 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
1075 const int bci = branch_bcp != NULL ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1076
1077 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
1078 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
1079 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
1080
1081 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1082 if (osr_nm != NULL && bs_nm != NULL) {
1083 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1084 osr_nm = NULL;
1085 }
1086 }
1087
1088 if (osr_nm != NULL) {
1089 // We may need to do on-stack replacement which requires that no
1090 // monitors in the activation are biased because their
1091 // BasicObjectLocks will need to migrate during OSR. Force
1092 // unbiasing of all monitors in the activation now (even though
1093 // the OSR nmethod might be invalidated) because we don't have a
1094 // safepoint opportunity later once the migration begins.
1095 if (UseBiasedLocking) {
1096 ResourceMark rm;
1097 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
1098 for( BasicObjectLock *kptr = last_frame.monitor_end();
1099 kptr < last_frame.monitor_begin();
1100 kptr = last_frame.next_monitor(kptr) ) {
1101 if( kptr->obj() != NULL ) {
1102 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
1103 }
1104 }
1105 BiasedLocking::revoke(objects_to_revoke, thread);
1106 }
1107 }
1108 return osr_nm;
1109 JRT_END
1110
1111 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1112 assert(ProfileInterpreter, "must be profiling interpreter");
1113 int bci = method->bci_from(cur_bcp);
1114 MethodData* mdo = method->method_data();
1115 if (mdo == NULL) return 0;
1116 return mdo->bci_to_di(bci);
1117 JRT_END
1118
1119 JRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
1120 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1121 // flag, in case this method triggers classloading which will call into Java.
1122 UnlockFlagSaver fs(thread);
1123
1124 assert(ProfileInterpreter, "must be profiling interpreter");
1125 LastFrameAccessor last_frame(thread);
1126 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1127 methodHandle method(thread, last_frame.method());
1128 Method::build_interpreter_method_data(method, THREAD);
1129 if (HAS_PENDING_EXCEPTION) {
1130 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1131 CLEAR_PENDING_EXCEPTION;
1132 // and fall through...
1133 }
1134 JRT_END
1135
1136
1137 #ifdef ASSERT
1138 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1139 assert(ProfileInterpreter, "must be profiling interpreter");
1140
1141 MethodData* mdo = method->method_data();
1142 assert(mdo != NULL, "must not be null");
1143
1144 int bci = method->bci_from(bcp);
1145
1146 address mdp2 = mdo->bci_to_dp(bci);
1147 if (mdp != mdp2) {
1148 ResourceMark rm;
1149 ResetNoHandleMark rnm; // In a LEAF entry.
1150 HandleMark hm;
1151 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1152 int current_di = mdo->dp_to_di(mdp);
1153 int expected_di = mdo->dp_to_di(mdp2);
1154 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1155 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1156 int approx_bci = -1;
1157 if (current_di >= 0) {
1158 approx_bci = mdo->data_at(current_di)->bci();
1159 }
1160 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1161 mdo->print_on(tty);
1162 method->print_codes();
1163 }
1164 assert(mdp == mdp2, "wrong mdp");
1165 JRT_END
1166 #endif // ASSERT
1167
1168 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
1169 assert(ProfileInterpreter, "must be profiling interpreter");
1170 ResourceMark rm(thread);
1171 HandleMark hm(thread);
1172 LastFrameAccessor last_frame(thread);
1173 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1174 MethodData* h_mdo = last_frame.method()->method_data();
1175
1176 // Grab a lock to ensure atomic access to setting the return bci and
1177 // the displacement. This can block and GC, invalidating all naked oops.
1178 MutexLocker ml(RetData_lock);
1179
1180 // ProfileData is essentially a wrapper around a derived oop, so we
1181 // need to take the lock before making any ProfileData structures.
1182 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1183 guarantee(data != NULL, "profile data must be valid");
1184 RetData* rdata = data->as_RetData();
1185 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1186 last_frame.set_mdp(new_mdp);
1187 JRT_END
1188
1189 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
1190 MethodCounters* mcs = Method::build_method_counters(m, thread);
1191 if (HAS_PENDING_EXCEPTION) {
1192 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1193 CLEAR_PENDING_EXCEPTION;
1194 }
1195 return mcs;
1196 JRT_END
1197
1198
1199 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
1200 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1201 // stack traversal automatically takes care of preserving arguments for invoke, so
1202 // this is no longer needed.
1203
1204 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1205 // if this is called during a safepoint
1206
1207 if (JvmtiExport::should_post_single_step()) {
1208 // We are called during regular safepoints and when the VM is
1209 // single stepping. If any thread is marked for single stepping,
1210 // then we may have JVMTI work to do.
1211 LastFrameAccessor last_frame(thread);
1212 JvmtiExport::at_single_stepping_point(thread, last_frame.method(), last_frame.bcp());
1213 }
1214 JRT_END
1215
1216 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1217 ConstantPoolCacheEntry *cp_entry))
1218
1219 // check the access_flags for the field in the klass
1220
1221 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1222 int index = cp_entry->field_index();
1223 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1224
1225 bool is_static = (obj == NULL);
1226 HandleMark hm(thread);
1227
1228 Handle h_obj;
1229 if (!is_static) {
1230 // non-static field accessors have an object, but we need a handle
1231 h_obj = Handle(thread, obj);
1232 }
1233 InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1234 jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);
1235 LastFrameAccessor last_frame(thread);
1236 JvmtiExport::post_field_access(thread, last_frame.method(), last_frame.bcp(), cp_entry_f1, h_obj, fid);
1237 JRT_END
1238
1239 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1240 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1241
1242 Klass* k = cp_entry->f1_as_klass();
1243
1244 // check the access_flags for the field in the klass
1245 InstanceKlass* ik = InstanceKlass::cast(k);
1246 int index = cp_entry->field_index();
1247 // bail out if field modifications are not watched
1248 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1249
1250 char sig_type = '\0';
1251
1252 switch(cp_entry->flag_state()) {
1253 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1254 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1255 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1256 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1257 case itos: sig_type = JVM_SIGNATURE_INT; break;
1258 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1259 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1260 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1261 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1262 default: ShouldNotReachHere(); return;
1263 }
1264 bool is_static = (obj == NULL);
1265
1266 HandleMark hm(thread);
1267 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);
1268 jvalue fvalue;
1269 #ifdef _LP64
1270 fvalue = *value;
1271 #else
1272 // Long/double values are stored unaligned and also noncontiguously with
1273 // tagged stacks. We can't just do a simple assignment even in the non-
1274 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1275 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1276 // We assume that the two halves of longs/doubles are stored in interpreter
1277 // stack slots in platform-endian order.
1278 jlong_accessor u;
1279 jint* newval = (jint*)value;
1280 u.words[0] = newval[0];
1281 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1282 fvalue.j = u.long_value;
1283 #endif // _LP64
1284
1285 Handle h_obj;
1286 if (!is_static) {
1287 // non-static field accessors have an object, but we need a handle
1288 h_obj = Handle(thread, obj);
1289 }
1290
1291 LastFrameAccessor last_frame(thread);
1292 JvmtiExport::post_raw_field_modification(thread, last_frame.method(), last_frame.bcp(), ik, h_obj,
1293 fid, sig_type, &fvalue);
1294 JRT_END
1295
1296 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1297 LastFrameAccessor last_frame(thread);
1298 JvmtiExport::post_method_entry(thread, last_frame.method(), last_frame.get_frame());
1299 JRT_END
1300
1301
1302 JRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1303 LastFrameAccessor last_frame(thread);
1304 JvmtiExport::post_method_exit(thread, last_frame.method(), last_frame.get_frame());
1305 JRT_END
1306
1307 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1308 {
1309 return (Interpreter::contains(pc) ? 1 : 0);
1310 }
1311 JRT_END
1312
1313
1314 // Implementation of SignatureHandlerLibrary
1315
1316 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1317 // Dummy definition (else normalization method is defined in CPU
1318 // dependant code)
1319 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1320 return fingerprint;
1321 }
1322 #endif
1323
1324 address SignatureHandlerLibrary::set_handler_blob() {
1325 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1326 if (handler_blob == NULL) {
1327 return NULL;
1328 }
1329 address handler = handler_blob->code_begin();
1330 _handler_blob = handler_blob;
1331 _handler = handler;
1332 return handler;
1333 }
1334
1335 void SignatureHandlerLibrary::initialize() {
1336 if (_fingerprints != NULL) {
1337 return;
1338 }
1339 if (set_handler_blob() == NULL) {
1340 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1341 }
1342
1343 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1344 SignatureHandlerLibrary::buffer_size);
1345 _buffer = bb->code_begin();
1346
1347 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1348 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1349 }
1350
1351 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1352 address handler = _handler;
1353 int insts_size = buffer->pure_insts_size();
1354 if (handler + insts_size > _handler_blob->code_end()) {
1355 // get a new handler blob
1356 handler = set_handler_blob();
1357 }
1358 if (handler != NULL) {
1359 memcpy(handler, buffer->insts_begin(), insts_size);
1360 pd_set_handler(handler);
1361 ICache::invalidate_range(handler, insts_size);
1362 _handler = handler + insts_size;
1363 }
1364 return handler;
1365 }
1366
1367 void SignatureHandlerLibrary::add(const methodHandle& method) {
1368 if (method->signature_handler() == NULL) {
1369 // use slow signature handler if we can't do better
1370 int handler_index = -1;
1371 // check if we can use customized (fast) signature handler
1372 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1373 // use customized signature handler
1374 MutexLocker mu(SignatureHandlerLibrary_lock);
1375 // make sure data structure is initialized
1376 initialize();
1377 // lookup method signature's fingerprint
1378 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1379 // allow CPU dependant code to optimize the fingerprints for the fast handler
1380 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1381 handler_index = _fingerprints->find(fingerprint);
1382 // create handler if necessary
1383 if (handler_index < 0) {
1384 ResourceMark rm;
1385 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1386 CodeBuffer buffer((address)(_buffer + align_offset),
1387 SignatureHandlerLibrary::buffer_size - align_offset);
1388 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1389 // copy into code heap
1390 address handler = set_handler(&buffer);
1391 if (handler == NULL) {
1392 // use slow signature handler (without memorizing it in the fingerprints)
1393 } else {
1394 // debugging suppport
1395 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1396 ttyLocker ttyl;
1397 tty->cr();
1398 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1399 _handlers->length(),
1400 (method->is_static() ? "static" : "receiver"),
1401 method->name_and_sig_as_C_string(),
1402 fingerprint,
1403 buffer.insts_size());
1404 if (buffer.insts_size() > 0) {
1405 Disassembler::decode(handler, handler + buffer.insts_size());
1406 }
1407 #ifndef PRODUCT
1408 address rh_begin = Interpreter::result_handler(method()->result_type());
1409 if (CodeCache::contains(rh_begin)) {
1410 // else it might be special platform dependent values
1411 tty->print_cr(" --- associated result handler ---");
1412 address rh_end = rh_begin;
1413 while (*(int*)rh_end != 0) {
1414 rh_end += sizeof(int);
1415 }
1416 Disassembler::decode(rh_begin, rh_end);
1417 } else {
1418 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1419 }
1420 #endif
1421 }
1422 // add handler to library
1423 _fingerprints->append(fingerprint);
1424 _handlers->append(handler);
1425 // set handler index
1426 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1427 handler_index = _fingerprints->length() - 1;
1428 }
1429 }
1430 // Set handler under SignatureHandlerLibrary_lock
1431 if (handler_index < 0) {
1432 // use generic signature handler
1433 method->set_signature_handler(Interpreter::slow_signature_handler());
1434 } else {
1435 // set handler
1436 method->set_signature_handler(_handlers->at(handler_index));
1437 }
1438 } else {
1439 DEBUG_ONLY(Thread::current()->check_possible_safepoint());
1440 // use generic signature handler
1441 method->set_signature_handler(Interpreter::slow_signature_handler());
1442 }
1443 }
1444 #ifdef ASSERT
1445 int handler_index = -1;
1446 int fingerprint_index = -2;
1447 {
1448 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1449 // in any way if accessed from multiple threads. To avoid races with another
1450 // thread which may change the arrays in the above, mutex protected block, we
1451 // have to protect this read access here with the same mutex as well!
1452 MutexLocker mu(SignatureHandlerLibrary_lock);
1453 if (_handlers != NULL) {
1454 handler_index = _handlers->find(method->signature_handler());
1455 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1456 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1457 fingerprint_index = _fingerprints->find(fingerprint);
1458 }
1459 }
1460 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1461 handler_index == fingerprint_index, "sanity check");
1462 #endif // ASSERT
1463 }
1464
1465 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1466 int handler_index = -1;
1467 // use customized signature handler
1468 MutexLocker mu(SignatureHandlerLibrary_lock);
1469 // make sure data structure is initialized
1470 initialize();
1471 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1472 handler_index = _fingerprints->find(fingerprint);
1473 // create handler if necessary
1474 if (handler_index < 0) {
1475 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1476 tty->cr();
1477 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1478 _handlers->length(),
1479 p2i(handler),
1480 fingerprint);
1481 }
1482 _fingerprints->append(fingerprint);
1483 _handlers->append(handler);
1484 } else {
1485 if (PrintSignatureHandlers) {
1486 tty->cr();
1487 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1488 _handlers->length(),
1489 fingerprint,
1490 p2i(_handlers->at(handler_index)),
1491 p2i(handler));
1492 }
1493 }
1494 }
1495
1496
1497 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1498 address SignatureHandlerLibrary::_handler = NULL;
1499 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1500 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1501 address SignatureHandlerLibrary::_buffer = NULL;
1502
1503
1504 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1505 methodHandle m(thread, method);
1506 assert(m->is_native(), "sanity check");
1507 // lookup native function entry point if it doesn't exist
1508 bool in_base_library;
1509 if (!m->has_native_function()) {
1510 NativeLookup::lookup(m, in_base_library, CHECK);
1511 }
1512 // make sure signature handler is installed
1513 SignatureHandlerLibrary::add(m);
1514 // The interpreter entry point checks the signature handler first,
1515 // before trying to fetch the native entry point and klass mirror.
1516 // We must set the signature handler last, so that multiple processors
1517 // preparing the same method will be sure to see non-null entry & mirror.
1518 JRT_END
1519
1520 #if defined(IA32) || defined(AMD64) || defined(ARM)
1521 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1522 if (src_address == dest_address) {
1523 return;
1524 }
1525 ResetNoHandleMark rnm; // In a LEAF entry.
1526 HandleMark hm;
1527 ResourceMark rm;
1528 LastFrameAccessor last_frame(thread);
1529 assert(last_frame.is_interpreted_frame(), "");
1530 jint bci = last_frame.bci();
1531 methodHandle mh(thread, last_frame.method());
1532 Bytecode_invoke invoke(mh, bci);
1533 ArgumentSizeComputer asc(invoke.signature());
1534 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1535 Copy::conjoint_jbytes(src_address, dest_address,
1536 size_of_arguments * Interpreter::stackElementSize);
1537 JRT_END
1538 #endif
1539
1540 #if INCLUDE_JVMTI
1541 // This is a support of the JVMTI PopFrame interface.
1542 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1543 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1544 // The member_name argument is a saved reference (in local#0) to the member_name.
1545 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1546 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1547 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1548 Method* method, address bcp))
1549 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1550 if (code != Bytecodes::_invokestatic) {
1551 return;
1552 }
1553 ConstantPool* cpool = method->constants();
1554 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1555 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1556 Symbol* mname = cpool->name_ref_at(cp_index);
1557
1558 if (MethodHandles::has_member_arg(cname, mname)) {
1559 oop member_name_oop = (oop) member_name;
1560 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1561 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1562 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1563 }
1564 thread->set_vm_result(member_name_oop);
1565 } else {
1566 thread->set_vm_result(NULL);
1567 }
1568 JRT_END
1569 #endif // INCLUDE_JVMTI
1570
1571 #ifndef PRODUCT
1572 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1573 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1574 // The generated code still uses call_VM because that will set up the frame pointer for
1575 // bcp and method.
1576 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1577 LastFrameAccessor last_frame(thread);
1578 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1579 methodHandle mh(thread, last_frame.method());
1580 BytecodeTracer::trace(mh, last_frame.bcp(), tos, tos2);
1581 return preserve_this_value;
1582 JRT_END
1583 #endif // !PRODUCT