1 /*
2 * Copyright (c) 1997, 2019, 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/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "gc/shared/barrierSetNMethod.hpp"
34 #include "gc/shared/collectedHeap.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "interpreter/interpreterRuntime.hpp"
37 #include "interpreter/linkResolver.hpp"
38 #include "interpreter/templateTable.hpp"
39 #include "logging/log.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.hpp"
43 #include "oops/constantPool.hpp"
44 #include "oops/cpCache.inline.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/methodData.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/symbol.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "prims/nativeLookup.hpp"
53 #include "runtime/atomic.hpp"
54 #include "runtime/biasedLocking.hpp"
55 #include "runtime/compilationPolicy.hpp"
56 #include "runtime/continuation.hpp"
57 #include "runtime/deoptimization.hpp"
58 #include "runtime/fieldDescriptor.inline.hpp"
59 #include "runtime/frame.inline.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/icache.hpp"
62 #include "runtime/interfaceSupport.inline.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/jfieldIDWorkaround.hpp"
66 #include "runtime/osThread.hpp"
67 #include "runtime/sharedRuntime.hpp"
68 #include "runtime/stubRoutines.hpp"
69 #include "runtime/synchronizer.hpp"
70 #include "runtime/threadCritical.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/copy.hpp"
73 #include "utilities/events.hpp"
74 #ifdef COMPILER2
75 #include "opto/runtime.hpp"
76 #endif
77
78 class UnlockFlagSaver {
79 private:
80 JavaThread* _thread;
81 bool _do_not_unlock;
82 public:
83 UnlockFlagSaver(JavaThread* t) {
84 _thread = t;
85 _do_not_unlock = t->do_not_unlock_if_synchronized();
86 t->set_do_not_unlock_if_synchronized(false);
87 }
88 ~UnlockFlagSaver() {
89 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
90 }
91 };
92
93 // Helper class to access current interpreter state
94 class LastFrameAccessor : public StackObj {
95 frame _last_frame;
96 public:
97 LastFrameAccessor(JavaThread* thread) {
98 assert(thread == Thread::current(), "sanity");
99 _last_frame = thread->last_frame();
100 }
101 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
102 Method* method() const { return _last_frame.interpreter_frame_method(); }
103 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
104 int bci() const { return _last_frame.interpreter_frame_bci(); }
105 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
106
107 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
108 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
109
110 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
111 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
112
113 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
114 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
115 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
116 int get_index_u2_cpcache(Bytecodes::Code bc) const
117 { return bytecode().get_index_u2_cpcache(bc); }
118 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
119 int number_of_dimensions() const { return bcp()[3]; }
120 ConstantPoolCacheEntry* cache_entry_at(int i) const
121 { return method()->constants()->cache()->entry_at(i); }
122 ConstantPoolCacheEntry* cache_entry() const { return cache_entry_at(Bytes::get_native_u2(bcp() + 1)); }
123
124 oop callee_receiver(Symbol* signature) {
125 return _last_frame.interpreter_callee_receiver(signature);
126 }
127 BasicObjectLock* monitor_begin() const {
128 return _last_frame.interpreter_frame_monitor_begin();
129 }
130 BasicObjectLock* monitor_end() const {
131 return _last_frame.interpreter_frame_monitor_end();
132 }
133 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
134 return _last_frame.next_monitor_in_interpreter_frame(current);
135 }
136
137 frame& get_frame() { return _last_frame; }
138 };
139
140 //------------------------------------------------------------------------------------------------------------------------
141 // State accessors
142
143 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
144 LastFrameAccessor last_frame(thread);
145 last_frame.set_bcp(bcp);
146 if (ProfileInterpreter) {
147 // ProfileTraps uses MDOs independently of ProfileInterpreter.
148 // That is why we must check both ProfileInterpreter and mdo != NULL.
149 MethodData* mdo = last_frame.method()->method_data();
150 if (mdo != NULL) {
151 NEEDS_CLEANUP;
152 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
153 }
154 }
155 }
156
157 //------------------------------------------------------------------------------------------------------------------------
158 // Constants
159
160
161 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
162 // access constant pool
163 LastFrameAccessor last_frame(thread);
164 ConstantPool* pool = last_frame.method()->constants();
165 int index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
166 constantTag tag = pool->tag_at(index);
167
168 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
169 Klass* klass = pool->klass_at(index, CHECK);
170 oop java_class = klass->java_mirror();
171 thread->set_vm_result(java_class);
172 JRT_END
173
174 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
175 assert(bytecode == Bytecodes::_ldc ||
176 bytecode == Bytecodes::_ldc_w ||
177 bytecode == Bytecodes::_ldc2_w ||
178 bytecode == Bytecodes::_fast_aldc ||
179 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
180 ResourceMark rm(thread);
181 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
182 bytecode == Bytecodes::_fast_aldc_w);
183 LastFrameAccessor last_frame(thread);
184 methodHandle m (thread, last_frame.method());
185 Bytecode_loadconstant ldc(m, last_frame.bci());
186
187 // Double-check the size. (Condy can have any type.)
188 BasicType type = ldc.result_type();
189 switch (type2size[type]) {
190 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
191 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
192 default: ShouldNotReachHere();
193 }
194
195 // Resolve the constant. This does not do unboxing.
196 // But it does replace Universe::the_null_sentinel by null.
197 oop result = ldc.resolve_constant(CHECK);
198 assert(result != NULL || is_fast_aldc, "null result only valid for fast_aldc");
199
200 #ifdef ASSERT
201 {
202 // The bytecode wrappers aren't GC-safe so construct a new one
203 Bytecode_loadconstant ldc2(m, last_frame.bci());
204 int rindex = ldc2.cache_index();
205 if (rindex < 0)
206 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
207 if (rindex >= 0) {
208 oop coop = m->constants()->resolved_references()->obj_at(rindex);
209 oop roop = (result == NULL ? Universe::the_null_sentinel() : result);
210 assert(oopDesc::equals(roop, coop), "expected result for assembly code");
211 }
212 }
213 #endif
214 thread->set_vm_result(result);
215 if (!is_fast_aldc) {
216 // Tell the interpreter how to unbox the primitive.
217 guarantee(java_lang_boxing_object::is_instance(result, type), "");
218 int offset = java_lang_boxing_object::value_offset_in_bytes(type);
219 intptr_t flags = ((as_TosState(type) << ConstantPoolCacheEntry::tos_state_shift)
220 | (offset & ConstantPoolCacheEntry::field_index_mask));
221 thread->set_vm_result_2((Metadata*)flags);
222 }
223 }
224 JRT_END
225
226
227 //------------------------------------------------------------------------------------------------------------------------
228 // Allocation
229
230 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
231 Klass* k = pool->klass_at(index, CHECK);
232 InstanceKlass* klass = InstanceKlass::cast(k);
233
234 // Make sure we are not instantiating an abstract klass
235 klass->check_valid_for_instantiation(true, CHECK);
236
237 // Make sure klass is initialized
238 klass->initialize(CHECK);
239
240 // At this point the class may not be fully initialized
241 // because of recursive initialization. If it is fully
242 // initialized & has_finalized is not set, we rewrite
243 // it into its fast version (Note: no locking is needed
244 // here since this is an atomic byte write and can be
245 // done more than once).
246 //
247 // Note: In case of classes with has_finalized we don't
248 // rewrite since that saves us an extra check in
249 // the fast version which then would call the
250 // slow version anyway (and do a call back into
251 // Java).
252 // If we have a breakpoint, then we don't rewrite
253 // because the _breakpoint bytecode would be lost.
254 oop obj = klass->allocate_instance(CHECK);
255 thread->set_vm_result(obj);
256 JRT_END
257
258
259 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
260 oop obj = oopFactory::new_typeArray(type, size, CHECK);
261 thread->set_vm_result(obj);
262 JRT_END
263
264
265 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
266 Klass* klass = pool->klass_at(index, CHECK);
267 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
268 thread->set_vm_result(obj);
269 JRT_END
270
271
272 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
273 // We may want to pass in more arguments - could make this slightly faster
274 LastFrameAccessor last_frame(thread);
275 ConstantPool* constants = last_frame.method()->constants();
276 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
277 Klass* klass = constants->klass_at(i, CHECK);
278 int nof_dims = last_frame.number_of_dimensions();
279 assert(klass->is_klass(), "not a class");
280 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
281
282 // We must create an array of jints to pass to multi_allocate.
283 ResourceMark rm(thread);
284 const int small_dims = 10;
285 jint dim_array[small_dims];
286 jint *dims = &dim_array[0];
287 if (nof_dims > small_dims) {
288 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
289 }
290 for (int index = 0; index < nof_dims; index++) {
291 // offset from first_size_address is addressed as local[index]
292 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
293 dims[index] = first_size_address[n];
294 }
295 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
296 thread->set_vm_result(obj);
297 JRT_END
298
299
300 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
301 assert(oopDesc::is_oop(obj), "must be a valid oop");
302 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
303 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
304 JRT_END
305
306
307 // Quicken instance-of and check-cast bytecodes
308 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
309 // Force resolving; quicken the bytecode
310 LastFrameAccessor last_frame(thread);
311 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
312 ConstantPool* cpool = last_frame.method()->constants();
313 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
314 // program we might have seen an unquick'd bytecode in the interpreter but have another
315 // thread quicken the bytecode before we get here.
316 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
317 Klass* klass = cpool->klass_at(which, CHECK);
318 thread->set_vm_result_2(klass);
319 JRT_END
320
321
322 //------------------------------------------------------------------------------------------------------------------------
323 // Exceptions
324
325 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
326 const methodHandle& trap_method, int trap_bci, TRAPS) {
327 if (trap_method.not_null()) {
328 MethodData* trap_mdo = trap_method->method_data();
329 if (trap_mdo == NULL) {
330 Method::build_interpreter_method_data(trap_method, THREAD);
331 if (HAS_PENDING_EXCEPTION) {
332 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
333 "we expect only an OOM error here");
334 CLEAR_PENDING_EXCEPTION;
335 }
336 trap_mdo = trap_method->method_data();
337 // and fall through...
338 }
339 if (trap_mdo != NULL) {
340 // Update per-method count of trap events. The interpreter
341 // is updating the MDO to simulate the effect of compiler traps.
342 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
343 }
344 }
345 }
346
347 // Assume the compiler is (or will be) interested in this event.
348 // If necessary, create an MDO to hold the information, and record it.
349 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
350 assert(ProfileTraps, "call me only if profiling");
351 LastFrameAccessor last_frame(thread);
352 methodHandle trap_method(thread, last_frame.method());
353 int trap_bci = trap_method->bci_from(last_frame.bcp());
354 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
355 }
356
357 #ifdef CC_INTERP
358 // As legacy note_trap, but we have more arguments.
359 JRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
360 methodHandle trap_method(method);
361 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
362 JRT_END
363
364 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
365 // for each exception.
366 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
367 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
368 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
369 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
370 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
371 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
372 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
373 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
374 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
375 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
376 #endif // CC_INTERP
377
378
379 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
380 // get klass
381 InstanceKlass* klass = InstanceKlass::cast(k);
382 assert(klass->is_initialized(),
383 "this klass should have been initialized during VM initialization");
384 // create instance - do not call constructor since we may have no
385 // (java) stack space left (should assert constructor is empty)
386 Handle exception;
387 oop exception_oop = klass->allocate_instance(CHECK_(exception));
388 exception = Handle(THREAD, exception_oop);
389 if (StackTraceInThrowable) {
390 java_lang_Throwable::fill_in_stack_trace(exception);
391 }
392 return exception;
393 }
394
395 // Special handling for stack overflow: since we don't have any (java) stack
396 // space left we use the pre-allocated & pre-initialized StackOverflowError
397 // klass to create an stack overflow error instance. We do not call its
398 // constructor for the same reason (it is empty, anyway).
399 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
400 Handle exception = get_preinitialized_exception(
401 SystemDictionary::StackOverflowError_klass(),
402 CHECK);
403 // Increment counter for hs_err file reporting
404 Atomic::inc(&Exceptions::_stack_overflow_errors);
405 THROW_HANDLE(exception);
406 JRT_END
407
408 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
409 Handle exception = get_preinitialized_exception(
410 SystemDictionary::StackOverflowError_klass(),
411 CHECK);
412 java_lang_Throwable::set_message(exception(),
413 Universe::delayed_stack_overflow_error_message());
414 // Increment counter for hs_err file reporting
415 Atomic::inc(&Exceptions::_stack_overflow_errors);
416 THROW_HANDLE(exception);
417 JRT_END
418
419 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
420 // lookup exception klass
421 TempNewSymbol s = SymbolTable::new_symbol(name);
422 if (ProfileTraps) {
423 if (s == vmSymbols::java_lang_ArithmeticException()) {
424 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
425 } else if (s == vmSymbols::java_lang_NullPointerException()) {
426 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
427 }
428 }
429 // create exception
430 Handle exception = Exceptions::new_exception(thread, s, message);
431 thread->set_vm_result(exception());
432 JRT_END
433
434
435 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
436 // Produce the error message first because note_trap can safepoint
437 ResourceMark rm(thread);
438 const char* klass_name = obj->klass()->external_name();
439 // lookup exception klass
440 TempNewSymbol s = SymbolTable::new_symbol(name);
441 if (ProfileTraps) {
442 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
443 }
444 // create exception, with klass name as detail message
445 Handle exception = Exceptions::new_exception(thread, s, klass_name);
446 thread->set_vm_result(exception());
447 JRT_END
448
449 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, arrayOopDesc* a, jint index))
450 // Produce the error message first because note_trap can safepoint
451 ResourceMark rm(thread);
452 stringStream ss;
453 ss.print("Index %d out of bounds for length %d", index, a->length());
454
455 if (ProfileTraps) {
456 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
457 }
458
459 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
460 JRT_END
461
462 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
463 JavaThread* thread, oopDesc* obj))
464
465 // Produce the error message first because note_trap can safepoint
466 ResourceMark rm(thread);
467 char* message = SharedRuntime::generate_class_cast_message(
468 thread, obj->klass());
469
470 if (ProfileTraps) {
471 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
472 }
473
474 // create exception
475 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
476 JRT_END
477
478 // exception_handler_for_exception(...) returns the continuation address,
479 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
480 // The exception oop is returned to make sure it is preserved over GC (it
481 // is only on the stack if the exception was thrown explicitly via athrow).
482 // During this operation, the expression stack contains the values for the
483 // bci where the exception happened. If the exception was propagated back
484 // from a call, the expression stack contains the values for the bci at the
485 // invoke w/o arguments (i.e., as if one were inside the call).
486 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
487
488 LastFrameAccessor last_frame(thread);
489 Handle h_exception(thread, exception);
490 methodHandle h_method (thread, last_frame.method());
491 constantPoolHandle h_constants(thread, h_method->constants());
492 bool should_repeat;
493 int handler_bci;
494 int current_bci = last_frame.bci();
495
496 if (thread->frames_to_pop_failed_realloc() > 0) {
497 // Allocation of scalar replaced object used in this frame
498 // failed. Unconditionally pop the frame.
499 thread->dec_frames_to_pop_failed_realloc();
500 thread->set_vm_result(h_exception());
501 // If the method is synchronized we already unlocked the monitor
502 // during deoptimization so the interpreter needs to skip it when
503 // the frame is popped.
504 thread->set_do_not_unlock_if_synchronized(true);
505 #ifdef CC_INTERP
506 return (address) -1;
507 #else
508 return Interpreter::remove_activation_entry();
509 #endif
510 }
511
512 // Need to do this check first since when _do_not_unlock_if_synchronized
513 // is set, we don't want to trigger any classloading which may make calls
514 // into java, or surprisingly find a matching exception handler for bci 0
515 // since at this moment the method hasn't been "officially" entered yet.
516 if (thread->do_not_unlock_if_synchronized()) {
517 ResourceMark rm;
518 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
519 thread->set_vm_result(exception);
520 #ifdef CC_INTERP
521 return (address) -1;
522 #else
523 return Interpreter::remove_activation_entry();
524 #endif
525 }
526
527 do {
528 should_repeat = false;
529
530 // assertions
531 #ifdef ASSERT
532 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
533 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
534 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
535 if (ExitVMOnVerifyError) vm_exit(-1);
536 ShouldNotReachHere();
537 }
538 #endif
539
540 // tracing
541 if (log_is_enabled(Info, exceptions)) {
542 ResourceMark rm(thread);
543 stringStream tempst;
544 tempst.print("interpreter method <%s>\n"
545 " at bci %d for thread " INTPTR_FORMAT " (%s)",
546 h_method->print_value_string(), current_bci, p2i(thread), thread->name());
547 Exceptions::log_exception(h_exception, tempst.as_string());
548 }
549 // Don't go paging in something which won't be used.
550 // else if (extable->length() == 0) {
551 // // disabled for now - interpreter is not using shortcut yet
552 // // (shortcut is not to call runtime if we have no exception handlers)
553 // // warning("performance bug: should not call runtime if method has no exception handlers");
554 // }
555 // for AbortVMOnException flag
556 Exceptions::debug_check_abort(h_exception);
557
558 // exception handler lookup
559 Klass* klass = h_exception->klass();
560 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
561 if (HAS_PENDING_EXCEPTION) {
562 // We threw an exception while trying to find the exception handler.
563 // Transfer the new exception to the exception handle which will
564 // be set into thread local storage, and do another lookup for an
565 // exception handler for this exception, this time starting at the
566 // BCI of the exception handler which caused the exception to be
567 // thrown (bug 4307310).
568 h_exception = Handle(THREAD, PENDING_EXCEPTION);
569 CLEAR_PENDING_EXCEPTION;
570 if (handler_bci >= 0) {
571 current_bci = handler_bci;
572 should_repeat = true;
573 }
574 }
575 } while (should_repeat == true);
576
577 #if INCLUDE_JVMCI
578 if (EnableJVMCI && h_method->method_data() != NULL) {
579 ResourceMark rm(thread);
580 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);
581 if (pdata != NULL && pdata->is_BitData()) {
582 BitData* bit_data = (BitData*) pdata;
583 bit_data->set_exception_seen();
584 }
585 }
586 #endif
587
588 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
589 // time throw or a stack unwinding throw and accordingly notify the debugger
590 if (JvmtiExport::can_post_on_exceptions()) {
591 JvmtiExport::post_exception_throw(thread, h_method(), last_frame.bcp(), h_exception());
592 }
593
594 #ifdef CC_INTERP
595 address continuation = (address)(intptr_t) handler_bci;
596 #else
597 address continuation = NULL;
598 #endif
599 address handler_pc = NULL;
600 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
601 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
602 // handler in this method, or (b) after a stack overflow there is not yet
603 // enough stack space available to reprotect the stack.
604 #ifndef CC_INTERP
605 continuation = Interpreter::remove_activation_entry();
606 #endif
607 #if COMPILER2_OR_JVMCI
608 // Count this for compilation purposes
609 h_method->interpreter_throwout_increment(THREAD);
610 #endif
611 } else {
612 // handler in this method => change bci/bcp to handler bci/bcp and continue there
613 handler_pc = h_method->code_base() + handler_bci;
614 #ifndef CC_INTERP
615 set_bcp_and_mdp(handler_pc, thread);
616 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
617 #endif
618 }
619 // notify debugger of an exception catch
620 // (this is good for exceptions caught in native methods as well)
621 if (JvmtiExport::can_post_on_exceptions()) {
622 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
623 }
624
625 thread->set_vm_result(h_exception());
626 return continuation;
627 JRT_END
628
629
630 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
631 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
632 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
633 JRT_END
634
635
636 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
637 THROW(vmSymbols::java_lang_AbstractMethodError());
638 JRT_END
639
640 // This method is called from the "abstract_entry" of the interpreter.
641 // At that point, the arguments have already been removed from the stack
642 // and therefore we don't have the receiver object at our fingertips. (Though,
643 // on some platforms the receiver still resides in a register...). Thus,
644 // we have no choice but print an error message not containing the receiver
645 // type.
646 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* thread,
647 Method* missingMethod))
648 ResourceMark rm(thread);
649 assert(missingMethod != NULL, "sanity");
650 methodHandle m(thread, missingMethod);
651 LinkResolver::throw_abstract_method_error(m, THREAD);
652 JRT_END
653
654 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* thread,
655 Klass* recvKlass,
656 Method* missingMethod))
657 ResourceMark rm(thread);
658 methodHandle mh = methodHandle(thread, missingMethod);
659 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
660 JRT_END
661
662
663 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
664 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
665 JRT_END
666
667 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* thread,
668 Klass* recvKlass,
669 Klass* interfaceKlass))
670 ResourceMark rm(thread);
671 char buf[1000];
672 buf[0] = '\0';
673 jio_snprintf(buf, sizeof(buf),
674 "Class %s does not implement the requested interface %s",
675 recvKlass ? recvKlass->external_name() : "NULL",
676 interfaceKlass ? interfaceKlass->external_name() : "NULL");
677 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
678 JRT_END
679
680 //------------------------------------------------------------------------------------------------------------------------
681 // Fields
682 //
683
684 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) {
685 Thread* THREAD = thread;
686 // resolve field
687 fieldDescriptor info;
688 LastFrameAccessor last_frame(thread);
689 constantPoolHandle pool(thread, last_frame.method()->constants());
690 methodHandle m(thread, last_frame.method());
691 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
692 bytecode == Bytecodes::_putstatic);
693 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
694
695 {
696 JvmtiHideSingleStepping jhss(thread);
697 LinkResolver::resolve_field_access(info, pool, last_frame.get_index_u2_cpcache(bytecode),
698 m, bytecode, CHECK);
699 } // end JvmtiHideSingleStepping
700
701 // check if link resolution caused cpCache to be updated
702 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
703 if (cp_cache_entry->is_resolved(bytecode)) return;
704
705 // compute auxiliary field attributes
706 TosState state = as_TosState(info.field_type());
707
708 // Resolution of put instructions on final fields is delayed. That is required so that
709 // exceptions are thrown at the correct place (when the instruction is actually invoked).
710 // If we do not resolve an instruction in the current pass, leaving the put_code
711 // set to zero will cause the next put instruction to the same field to reresolve.
712
713 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
714 // to final instance fields with updates originating from a method different than <init>)
715 // is inhibited. A putfield instruction targeting an instance final field must throw
716 // an IllegalAccessError if the instruction is not in an instance
717 // initializer method <init>. If resolution were not inhibited, a putfield
718 // in an initializer method could be resolved in the initializer. Subsequent
719 // putfield instructions to the same field would then use cached information.
720 // As a result, those instructions would not pass through the VM. That is,
721 // checks in resolve_field_access() would not be executed for those instructions
722 // and the required IllegalAccessError would not be thrown.
723 //
724 // Also, we need to delay resolving getstatic and putstatic instructions until the
725 // class is initialized. This is required so that access to the static
726 // field will call the initialization function every time until the class
727 // is completely initialized ala. in 2.17.5 in JVM Specification.
728 InstanceKlass* klass = info.field_holder();
729 bool uninitialized_static = is_static && !klass->is_initialized();
730 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
731 info.has_initialized_final_update();
732 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
733
734 Bytecodes::Code get_code = (Bytecodes::Code)0;
735 Bytecodes::Code put_code = (Bytecodes::Code)0;
736 if (!uninitialized_static) {
737 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
738 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
739 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
740 }
741 }
742
743 cp_cache_entry->set_field(
744 get_code,
745 put_code,
746 info.field_holder(),
747 info.index(),
748 info.offset(),
749 state,
750 info.access_flags().is_final(),
751 info.access_flags().is_volatile(),
752 pool->pool_holder()
753 );
754 }
755
756
757 //------------------------------------------------------------------------------------------------------------------------
758 // Synchronization
759 //
760 // The interpreter's synchronization code is factored out so that it can
761 // be shared by method invocation and synchronized blocks.
762 //%note synchronization_3
763
764 //%note monitor_1
765 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
766 #ifdef ASSERT
767 thread->last_frame().interpreter_frame_verify_monitor(elem);
768 #endif
769 if (PrintBiasedLockingStatistics) {
770 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
771 }
772 Handle h_obj(thread, elem->obj());
773 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
774 "must be NULL or an object");
775 if (UseBiasedLocking) {
776 // Retry fast entry if bias is revoked to avoid unnecessary inflation
777 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
778 } else {
779 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
780 }
781 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
782 "must be NULL or an object");
783 #ifdef ASSERT
784 thread->last_frame().interpreter_frame_verify_monitor(elem);
785 #endif
786 JRT_END
787
788
789 //%note monitor_1
790 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
791 #ifdef ASSERT
792 thread->last_frame().interpreter_frame_verify_monitor(elem);
793 #endif
794 Handle h_obj(thread, elem->obj());
795 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
796 "must be NULL or an object");
797 if (elem == NULL || h_obj()->is_unlocked()) {
798 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
799 }
800 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
801 // Free entry. This must be done here, since a pending exception might be installed on
802 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
803 elem->set_obj(NULL);
804 #ifdef ASSERT
805 thread->last_frame().interpreter_frame_verify_monitor(elem);
806 #endif
807 JRT_END
808
809
810 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
811 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
812 JRT_END
813
814
815 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
816 // Returns an illegal exception to install into the current thread. The
817 // pending_exception flag is cleared so normal exception handling does not
818 // trigger. Any current installed exception will be overwritten. This
819 // method will be called during an exception unwind.
820
821 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
822 Handle exception(thread, thread->vm_result());
823 assert(exception() != NULL, "vm result should be set");
824 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
825 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
826 exception = get_preinitialized_exception(
827 SystemDictionary::IllegalMonitorStateException_klass(),
828 CATCH);
829 }
830 thread->set_vm_result(exception());
831 JRT_END
832
833
834 //------------------------------------------------------------------------------------------------------------------------
835 // Invokes
836
837 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
838 return method->orig_bytecode_at(method->bci_from(bcp));
839 JRT_END
840
841 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
842 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
843 JRT_END
844
845 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
846 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
847 JRT_END
848
849 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) {
850 Thread* THREAD = thread;
851 LastFrameAccessor last_frame(thread);
852 // extract receiver from the outgoing argument list if necessary
853 Handle receiver(thread, NULL);
854 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
855 bytecode == Bytecodes::_invokespecial) {
856 ResourceMark rm(thread);
857 methodHandle m (thread, last_frame.method());
858 Bytecode_invoke call(m, last_frame.bci());
859 Symbol* signature = call.signature();
860 receiver = Handle(thread, last_frame.callee_receiver(signature));
861
862 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
863 "sanity check");
864 assert(receiver.is_null() ||
865 !Universe::heap()->is_in_reserved(receiver->klass()),
866 "sanity check");
867 }
868
869 // resolve method
870 CallInfo info;
871 constantPoolHandle pool(thread, last_frame.method()->constants());
872
873 {
874 JvmtiHideSingleStepping jhss(thread);
875 LinkResolver::resolve_invoke(info, receiver, pool,
876 last_frame.get_index_u2_cpcache(bytecode), bytecode,
877 CHECK);
878 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
879 int retry_count = 0;
880 while (info.resolved_method()->is_old()) {
881 // It is very unlikely that method is redefined more than 100 times
882 // in the middle of resolve. If it is looping here more than 100 times
883 // means then there could be a bug here.
884 guarantee((retry_count++ < 100),
885 "Could not resolve to latest version of redefined method");
886 // method is redefined in the middle of resolve so re-try.
887 LinkResolver::resolve_invoke(info, receiver, pool,
888 last_frame.get_index_u2_cpcache(bytecode), bytecode,
889 CHECK);
890 }
891 }
892 } // end JvmtiHideSingleStepping
893
894 // check if link resolution caused cpCache to be updated
895 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
896 if (cp_cache_entry->is_resolved(bytecode)) return;
897
898 #ifdef ASSERT
899 if (bytecode == Bytecodes::_invokeinterface) {
900 if (info.resolved_method()->method_holder() ==
901 SystemDictionary::Object_klass()) {
902 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
903 // (see also CallInfo::set_interface for details)
904 assert(info.call_kind() == CallInfo::vtable_call ||
905 info.call_kind() == CallInfo::direct_call, "");
906 methodHandle rm = info.resolved_method();
907 assert(rm->is_final() || info.has_vtable_index(),
908 "should have been set already");
909 } else if (!info.resolved_method()->has_itable_index()) {
910 // Resolved something like CharSequence.toString. Use vtable not itable.
911 assert(info.call_kind() != CallInfo::itable_call, "");
912 } else {
913 // Setup itable entry
914 assert(info.call_kind() == CallInfo::itable_call, "");
915 int index = info.resolved_method()->itable_index();
916 assert(info.itable_index() == index, "");
917 }
918 } else if (bytecode == Bytecodes::_invokespecial) {
919 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
920 } else {
921 assert(info.call_kind() == CallInfo::direct_call ||
922 info.call_kind() == CallInfo::vtable_call, "");
923 }
924 #endif
925 // Get sender or sender's unsafe_anonymous_host, and only set cpCache entry to resolved if
926 // it is not an interface. The receiver for invokespecial calls within interface
927 // methods must be checked for every call.
928 InstanceKlass* sender = pool->pool_holder();
929 sender = sender->is_unsafe_anonymous() ? sender->unsafe_anonymous_host() : sender;
930
931 switch (info.call_kind()) {
932 case CallInfo::direct_call:
933 cp_cache_entry->set_direct_call(
934 bytecode,
935 info.resolved_method(),
936 sender->is_interface());
937 break;
938 case CallInfo::vtable_call:
939 cp_cache_entry->set_vtable_call(
940 bytecode,
941 info.resolved_method(),
942 info.vtable_index());
943 break;
944 case CallInfo::itable_call:
945 cp_cache_entry->set_itable_call(
946 bytecode,
947 info.resolved_klass(),
948 info.resolved_method(),
949 info.itable_index());
950 break;
951 default: ShouldNotReachHere();
952 }
953 }
954
955
956 // First time execution: Resolve symbols, create a permanent MethodType object.
957 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) {
958 Thread* THREAD = thread;
959 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
960 LastFrameAccessor last_frame(thread);
961
962 // resolve method
963 CallInfo info;
964 constantPoolHandle pool(thread, last_frame.method()->constants());
965 {
966 JvmtiHideSingleStepping jhss(thread);
967 LinkResolver::resolve_invoke(info, Handle(), pool,
968 last_frame.get_index_u2_cpcache(bytecode), bytecode,
969 CHECK);
970 } // end JvmtiHideSingleStepping
971
972 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
973 cp_cache_entry->set_method_handle(pool, info);
974 }
975
976 // First time execution: Resolve symbols, create a permanent CallSite object.
977 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) {
978 Thread* THREAD = thread;
979 LastFrameAccessor last_frame(thread);
980 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
981
982 // resolve method
983 CallInfo info;
984 constantPoolHandle pool(thread, last_frame.method()->constants());
985 int index = last_frame.get_index_u4(bytecode);
986 {
987 JvmtiHideSingleStepping jhss(thread);
988 LinkResolver::resolve_invoke(info, Handle(), pool,
989 index, bytecode, CHECK);
990 } // end JvmtiHideSingleStepping
991
992 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
993 cp_cache_entry->set_dynamic_call(pool, info);
994 }
995
996 // This function is the interface to the assembly code. It returns the resolved
997 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
998 // This function will check for redefinition!
999 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) {
1000 switch (bytecode) {
1001 case Bytecodes::_getstatic:
1002 case Bytecodes::_putstatic:
1003 case Bytecodes::_getfield:
1004 case Bytecodes::_putfield:
1005 resolve_get_put(thread, bytecode);
1006 break;
1007 case Bytecodes::_invokevirtual:
1008 case Bytecodes::_invokespecial:
1009 case Bytecodes::_invokestatic:
1010 case Bytecodes::_invokeinterface:
1011 resolve_invoke(thread, bytecode);
1012 break;
1013 case Bytecodes::_invokehandle:
1014 resolve_invokehandle(thread);
1015 break;
1016 case Bytecodes::_invokedynamic:
1017 resolve_invokedynamic(thread);
1018 break;
1019 default:
1020 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1021 break;
1022 }
1023 }
1024 JRT_END
1025
1026 //------------------------------------------------------------------------------------------------------------------------
1027 // Miscellaneous
1028
1029
1030 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
1031 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
1032 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
1033 if (branch_bcp != NULL && nm != NULL) {
1034 // This was a successful request for an OSR nmethod. Because
1035 // frequency_counter_overflow_inner ends with a safepoint check,
1036 // nm could have been unloaded so look it up again. It's unsafe
1037 // to examine nm directly since it might have been freed and used
1038 // for something else.
1039 LastFrameAccessor last_frame(thread);
1040 Method* method = last_frame.method();
1041 int bci = method->bci_from(last_frame.bcp());
1042 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1043 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1044 if (nm != NULL && bs_nm != NULL) {
1045 // in case the transition passed a safepoint we need to barrier this again
1046 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1047 nm = NULL;
1048 }
1049 }
1050 }
1051 if (nm != NULL && thread->is_interp_only_mode()) {
1052 // Normally we never get an nm if is_interp_only_mode() is true, because
1053 // policy()->event has a check for this and won't compile the method when
1054 // true. However, it's possible for is_interp_only_mode() to become true
1055 // during the compilation. We don't want to return the nm in that case
1056 // because we want to continue to execute interpreted.
1057 nm = NULL;
1058 }
1059 #ifndef PRODUCT
1060 if (TraceOnStackReplacement) {
1061 if (nm != NULL) {
1062 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1063 nm->print();
1064 }
1065 }
1066 #endif
1067 return nm;
1068 }
1069
1070 JRT_ENTRY(nmethod*,
1071 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
1072 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1073 // flag, in case this method triggers classloading which will call into Java.
1074 UnlockFlagSaver fs(thread);
1075
1076 LastFrameAccessor last_frame(thread);
1077 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1078 methodHandle method(thread, last_frame.method());
1079 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
1080 const int bci = branch_bcp != NULL ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1081
1082 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
1083 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
1084 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
1085
1086 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1087 if (osr_nm != NULL && bs_nm != NULL) {
1088 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1089 osr_nm = NULL;
1090 }
1091 }
1092
1093 if (osr_nm != NULL) {
1094 // We may need to do on-stack replacement which requires that no
1095 // monitors in the activation are biased because their
1096 // BasicObjectLocks will need to migrate during OSR. Force
1097 // unbiasing of all monitors in the activation now (even though
1098 // the OSR nmethod might be invalidated) because we don't have a
1099 // safepoint opportunity later once the migration begins.
1100 if (UseBiasedLocking) {
1101 ResourceMark rm;
1102 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
1103 for( BasicObjectLock *kptr = last_frame.monitor_end();
1104 kptr < last_frame.monitor_begin();
1105 kptr = last_frame.next_monitor(kptr) ) {
1106 if( kptr->obj() != NULL ) {
1107 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
1108 }
1109 }
1110 BiasedLocking::revoke(objects_to_revoke, thread);
1111 }
1112 }
1113 return osr_nm;
1114 JRT_END
1115
1116 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1117 assert(ProfileInterpreter, "must be profiling interpreter");
1118 int bci = method->bci_from(cur_bcp);
1119 MethodData* mdo = method->method_data();
1120 if (mdo == NULL) return 0;
1121 return mdo->bci_to_di(bci);
1122 JRT_END
1123
1124 JRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
1125 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1126 // flag, in case this method triggers classloading which will call into Java.
1127 UnlockFlagSaver fs(thread);
1128
1129 assert(ProfileInterpreter, "must be profiling interpreter");
1130 LastFrameAccessor last_frame(thread);
1131 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1132 methodHandle method(thread, last_frame.method());
1133 Method::build_interpreter_method_data(method, THREAD);
1134 if (HAS_PENDING_EXCEPTION) {
1135 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1136 CLEAR_PENDING_EXCEPTION;
1137 // and fall through...
1138 }
1139 JRT_END
1140
1141
1142 #ifdef ASSERT
1143 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1144 assert(ProfileInterpreter, "must be profiling interpreter");
1145
1146 MethodData* mdo = method->method_data();
1147 assert(mdo != NULL, "must not be null");
1148
1149 int bci = method->bci_from(bcp);
1150
1151 address mdp2 = mdo->bci_to_dp(bci);
1152 if (mdp != mdp2) {
1153 ResourceMark rm;
1154 ResetNoHandleMark rnm; // In a LEAF entry.
1155 HandleMark hm;
1156 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1157 int current_di = mdo->dp_to_di(mdp);
1158 int expected_di = mdo->dp_to_di(mdp2);
1159 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1160 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1161 int approx_bci = -1;
1162 if (current_di >= 0) {
1163 approx_bci = mdo->data_at(current_di)->bci();
1164 }
1165 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1166 mdo->print_on(tty);
1167 method->print_codes();
1168 }
1169 assert(mdp == mdp2, "wrong mdp");
1170 JRT_END
1171 #endif // ASSERT
1172
1173 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
1174 assert(ProfileInterpreter, "must be profiling interpreter");
1175 ResourceMark rm(thread);
1176 HandleMark hm(thread);
1177 LastFrameAccessor last_frame(thread);
1178 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1179 MethodData* h_mdo = last_frame.method()->method_data();
1180
1181 // Grab a lock to ensure atomic access to setting the return bci and
1182 // the displacement. This can block and GC, invalidating all naked oops.
1183 MutexLocker ml(RetData_lock);
1184
1185 // ProfileData is essentially a wrapper around a derived oop, so we
1186 // need to take the lock before making any ProfileData structures.
1187 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1188 guarantee(data != NULL, "profile data must be valid");
1189 RetData* rdata = data->as_RetData();
1190 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1191 last_frame.set_mdp(new_mdp);
1192 JRT_END
1193
1194 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
1195 MethodCounters* mcs = Method::build_method_counters(m, thread);
1196 if (HAS_PENDING_EXCEPTION) {
1197 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1198 CLEAR_PENDING_EXCEPTION;
1199 }
1200 return mcs;
1201 JRT_END
1202
1203
1204 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
1205 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1206 // stack traversal automatically takes care of preserving arguments for invoke, so
1207 // this is no longer needed.
1208
1209 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1210 // if this is called during a safepoint
1211
1212 if (JvmtiExport::should_post_single_step()) {
1213 // We are called during regular safepoints and when the VM is
1214 // single stepping. If any thread is marked for single stepping,
1215 // then we may have JVMTI work to do.
1216 LastFrameAccessor last_frame(thread);
1217 JvmtiExport::at_single_stepping_point(thread, last_frame.method(), last_frame.bcp());
1218 }
1219 JRT_END
1220
1221 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1222 ConstantPoolCacheEntry *cp_entry))
1223
1224 // check the access_flags for the field in the klass
1225
1226 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1227 int index = cp_entry->field_index();
1228 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1229
1230 bool is_static = (obj == NULL);
1231 HandleMark hm(thread);
1232
1233 Handle h_obj;
1234 if (!is_static) {
1235 // non-static field accessors have an object, but we need a handle
1236 h_obj = Handle(thread, obj);
1237 }
1238 InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1239 jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);
1240 LastFrameAccessor last_frame(thread);
1241 JvmtiExport::post_field_access(thread, last_frame.method(), last_frame.bcp(), cp_entry_f1, h_obj, fid);
1242 JRT_END
1243
1244 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1245 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1246
1247 Klass* k = cp_entry->f1_as_klass();
1248
1249 // check the access_flags for the field in the klass
1250 InstanceKlass* ik = InstanceKlass::cast(k);
1251 int index = cp_entry->field_index();
1252 // bail out if field modifications are not watched
1253 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1254
1255 char sig_type = '\0';
1256
1257 switch(cp_entry->flag_state()) {
1258 case btos: sig_type = 'B'; break;
1259 case ztos: sig_type = 'Z'; break;
1260 case ctos: sig_type = 'C'; break;
1261 case stos: sig_type = 'S'; break;
1262 case itos: sig_type = 'I'; break;
1263 case ftos: sig_type = 'F'; break;
1264 case atos: sig_type = 'L'; break;
1265 case ltos: sig_type = 'J'; break;
1266 case dtos: sig_type = 'D'; break;
1267 default: ShouldNotReachHere(); return;
1268 }
1269 bool is_static = (obj == NULL);
1270
1271 HandleMark hm(thread);
1272 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);
1273 jvalue fvalue;
1274 #ifdef _LP64
1275 fvalue = *value;
1276 #else
1277 // Long/double values are stored unaligned and also noncontiguously with
1278 // tagged stacks. We can't just do a simple assignment even in the non-
1279 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1280 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1281 // We assume that the two halves of longs/doubles are stored in interpreter
1282 // stack slots in platform-endian order.
1283 jlong_accessor u;
1284 jint* newval = (jint*)value;
1285 u.words[0] = newval[0];
1286 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1287 fvalue.j = u.long_value;
1288 #endif // _LP64
1289
1290 Handle h_obj;
1291 if (!is_static) {
1292 // non-static field accessors have an object, but we need a handle
1293 h_obj = Handle(thread, obj);
1294 }
1295
1296 LastFrameAccessor last_frame(thread);
1297 JvmtiExport::post_raw_field_modification(thread, last_frame.method(), last_frame.bcp(), ik, h_obj,
1298 fid, sig_type, &fvalue);
1299 JRT_END
1300
1301 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1302 LastFrameAccessor last_frame(thread);
1303 JvmtiExport::post_method_entry(thread, last_frame.method(), last_frame.get_frame());
1304 JRT_END
1305
1306
1307 JRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1308 LastFrameAccessor last_frame(thread);
1309 JvmtiExport::post_method_exit(thread, last_frame.method(), last_frame.get_frame());
1310 JRT_END
1311
1312 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1313 {
1314 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1315 }
1316 JRT_END
1317
1318
1319 // Implementation of SignatureHandlerLibrary
1320
1321 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1322 // Dummy definition (else normalization method is defined in CPU
1323 // dependant code)
1324 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1325 return fingerprint;
1326 }
1327 #endif
1328
1329 address SignatureHandlerLibrary::set_handler_blob() {
1330 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1331 if (handler_blob == NULL) {
1332 return NULL;
1333 }
1334 address handler = handler_blob->code_begin();
1335 _handler_blob = handler_blob;
1336 _handler = handler;
1337 return handler;
1338 }
1339
1340 void SignatureHandlerLibrary::initialize() {
1341 if (_fingerprints != NULL) {
1342 return;
1343 }
1344 if (set_handler_blob() == NULL) {
1345 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1346 }
1347
1348 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1349 SignatureHandlerLibrary::buffer_size);
1350 _buffer = bb->code_begin();
1351
1352 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1353 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1354 }
1355
1356 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1357 address handler = _handler;
1358 int insts_size = buffer->pure_insts_size();
1359 if (handler + insts_size > _handler_blob->code_end()) {
1360 // get a new handler blob
1361 handler = set_handler_blob();
1362 }
1363 if (handler != NULL) {
1364 memcpy(handler, buffer->insts_begin(), insts_size);
1365 pd_set_handler(handler);
1366 ICache::invalidate_range(handler, insts_size);
1367 _handler = handler + insts_size;
1368 }
1369 return handler;
1370 }
1371
1372 void SignatureHandlerLibrary::add(const methodHandle& method) {
1373 if (method->signature_handler() == NULL) {
1374 // use slow signature handler if we can't do better
1375 int handler_index = -1;
1376 // check if we can use customized (fast) signature handler
1377 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1378 // use customized signature handler
1379 MutexLocker mu(SignatureHandlerLibrary_lock);
1380 // make sure data structure is initialized
1381 initialize();
1382 // lookup method signature's fingerprint
1383 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1384 // allow CPU dependant code to optimize the fingerprints for the fast handler
1385 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1386 handler_index = _fingerprints->find(fingerprint);
1387 // create handler if necessary
1388 if (handler_index < 0) {
1389 ResourceMark rm;
1390 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1391 CodeBuffer buffer((address)(_buffer + align_offset),
1392 SignatureHandlerLibrary::buffer_size - align_offset);
1393 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1394 // copy into code heap
1395 address handler = set_handler(&buffer);
1396 if (handler == NULL) {
1397 // use slow signature handler (without memorizing it in the fingerprints)
1398 } else {
1399 // debugging suppport
1400 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1401 ttyLocker ttyl;
1402 tty->cr();
1403 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1404 _handlers->length(),
1405 (method->is_static() ? "static" : "receiver"),
1406 method->name_and_sig_as_C_string(),
1407 fingerprint,
1408 buffer.insts_size());
1409 if (buffer.insts_size() > 0) {
1410 Disassembler::decode(handler, handler + buffer.insts_size());
1411 }
1412 #ifndef PRODUCT
1413 address rh_begin = Interpreter::result_handler(method()->result_type());
1414 if (CodeCache::contains(rh_begin)) {
1415 // else it might be special platform dependent values
1416 tty->print_cr(" --- associated result handler ---");
1417 address rh_end = rh_begin;
1418 while (*(int*)rh_end != 0) {
1419 rh_end += sizeof(int);
1420 }
1421 Disassembler::decode(rh_begin, rh_end);
1422 } else {
1423 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1424 }
1425 #endif
1426 }
1427 // add handler to library
1428 _fingerprints->append(fingerprint);
1429 _handlers->append(handler);
1430 // set handler index
1431 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1432 handler_index = _fingerprints->length() - 1;
1433 }
1434 }
1435 // Set handler under SignatureHandlerLibrary_lock
1436 if (handler_index < 0) {
1437 // use generic signature handler
1438 method->set_signature_handler(Interpreter::slow_signature_handler());
1439 } else {
1440 // set handler
1441 method->set_signature_handler(_handlers->at(handler_index));
1442 }
1443 } else {
1444 DEBUG_ONLY(Thread::current()->check_possible_safepoint());
1445 // use generic signature handler
1446 method->set_signature_handler(Interpreter::slow_signature_handler());
1447 }
1448 }
1449 #ifdef ASSERT
1450 int handler_index = -1;
1451 int fingerprint_index = -2;
1452 {
1453 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1454 // in any way if accessed from multiple threads. To avoid races with another
1455 // thread which may change the arrays in the above, mutex protected block, we
1456 // have to protect this read access here with the same mutex as well!
1457 MutexLocker mu(SignatureHandlerLibrary_lock);
1458 if (_handlers != NULL) {
1459 handler_index = _handlers->find(method->signature_handler());
1460 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1461 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1462 fingerprint_index = _fingerprints->find(fingerprint);
1463 }
1464 }
1465 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1466 handler_index == fingerprint_index, "sanity check");
1467 #endif // ASSERT
1468 }
1469
1470 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1471 int handler_index = -1;
1472 // use customized signature handler
1473 MutexLocker mu(SignatureHandlerLibrary_lock);
1474 // make sure data structure is initialized
1475 initialize();
1476 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1477 handler_index = _fingerprints->find(fingerprint);
1478 // create handler if necessary
1479 if (handler_index < 0) {
1480 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1481 tty->cr();
1482 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1483 _handlers->length(),
1484 p2i(handler),
1485 fingerprint);
1486 }
1487 _fingerprints->append(fingerprint);
1488 _handlers->append(handler);
1489 } else {
1490 if (PrintSignatureHandlers) {
1491 tty->cr();
1492 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1493 _handlers->length(),
1494 fingerprint,
1495 p2i(_handlers->at(handler_index)),
1496 p2i(handler));
1497 }
1498 }
1499 }
1500
1501
1502 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1503 address SignatureHandlerLibrary::_handler = NULL;
1504 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1505 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1506 address SignatureHandlerLibrary::_buffer = NULL;
1507
1508
1509 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1510 methodHandle m(thread, method);
1511 assert(m->is_native(), "sanity check");
1512 // lookup native function entry point if it doesn't exist
1513 bool in_base_library;
1514 if (!m->has_native_function()) {
1515 NativeLookup::lookup(m, in_base_library, CHECK);
1516 }
1517 // make sure signature handler is installed
1518 SignatureHandlerLibrary::add(m);
1519 // The interpreter entry point checks the signature handler first,
1520 // before trying to fetch the native entry point and klass mirror.
1521 // We must set the signature handler last, so that multiple processors
1522 // preparing the same method will be sure to see non-null entry & mirror.
1523 JRT_END
1524
1525 #if defined(IA32) || defined(AMD64) || defined(ARM)
1526 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1527 if (src_address == dest_address) {
1528 return;
1529 }
1530 ResetNoHandleMark rnm; // In a LEAF entry.
1531 HandleMark hm;
1532 ResourceMark rm;
1533 LastFrameAccessor last_frame(thread);
1534 assert(last_frame.is_interpreted_frame(), "");
1535 jint bci = last_frame.bci();
1536 methodHandle mh(thread, last_frame.method());
1537 Bytecode_invoke invoke(mh, bci);
1538 ArgumentSizeComputer asc(invoke.signature());
1539 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1540 Copy::conjoint_jbytes(src_address, dest_address,
1541 size_of_arguments * Interpreter::stackElementSize);
1542 JRT_END
1543 #endif
1544
1545 #if INCLUDE_JVMTI
1546 // This is a support of the JVMTI PopFrame interface.
1547 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1548 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1549 // The member_name argument is a saved reference (in local#0) to the member_name.
1550 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1551 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1552 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1553 Method* method, address bcp))
1554 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1555 if (code != Bytecodes::_invokestatic) {
1556 return;
1557 }
1558 ConstantPool* cpool = method->constants();
1559 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1560 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1561 Symbol* mname = cpool->name_ref_at(cp_index);
1562
1563 if (MethodHandles::has_member_arg(cname, mname)) {
1564 oop member_name_oop = (oop) member_name;
1565 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1566 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1567 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1568 }
1569 thread->set_vm_result(member_name_oop);
1570 } else {
1571 thread->set_vm_result(NULL);
1572 }
1573 JRT_END
1574 #endif // INCLUDE_JVMTI
1575
1576 #ifndef PRODUCT
1577 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1578 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1579 // The generated code still uses call_VM because that will set up the frame pointer for
1580 // bcp and method.
1581 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1582 LastFrameAccessor last_frame(thread);
1583 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1584 methodHandle mh(thread, last_frame.method());
1585 BytecodeTracer::trace(mh, last_frame.bcp(), tos, tos2);
1586 return preserve_this_value;
1587 JRT_END
1588 #endif // !PRODUCT