1 /*
2 * Copyright (c) 1997, 2018, 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/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/codeCache.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/disassembler.hpp"
32 #include "gc/shared/collectedHeap.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/interpreterRuntime.hpp"
35 #include "interpreter/linkResolver.hpp"
36 #include "interpreter/templateTable.hpp"
37 #include "logging/log.hpp"
38 #include "memory/oopFactory.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/constantPool.hpp"
42 #include "oops/cpCache.inline.hpp"
43 #include "oops/instanceKlass.hpp"
44 #include "oops/methodData.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "oops/objArrayOop.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "oops/symbol.hpp"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/nativeLookup.hpp"
51 #include "runtime/atomic.hpp"
52 #include "runtime/biasedLocking.hpp"
53 #include "runtime/compilationPolicy.hpp"
54 #include "runtime/deoptimization.hpp"
55 #include "runtime/fieldDescriptor.inline.hpp"
56 #include "runtime/frame.inline.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/icache.hpp"
59 #include "runtime/interfaceSupport.inline.hpp"
60 #include "runtime/java.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/jfieldIDWorkaround.hpp"
63 #include "runtime/osThread.hpp"
64 #include "runtime/sharedRuntime.hpp"
65 #include "runtime/stubRoutines.hpp"
66 #include "runtime/synchronizer.hpp"
67 #include "runtime/threadCritical.hpp"
68 #include "utilities/align.hpp"
69 #include "utilities/copy.hpp"
70 #include "utilities/events.hpp"
71 #ifdef COMPILER2
72 #include "opto/runtime.hpp"
73 #endif
74
75 class UnlockFlagSaver {
76 private:
77 JavaThread* _thread;
78 bool _do_not_unlock;
79 public:
80 UnlockFlagSaver(JavaThread* t) {
81 _thread = t;
82 _do_not_unlock = t->do_not_unlock_if_synchronized();
83 t->set_do_not_unlock_if_synchronized(false);
84 }
85 ~UnlockFlagSaver() {
86 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
87 }
88 };
89
90 // Helper class to access current interpreter state
91 class LastFrameAccessor : public StackObj {
92 frame _last_frame;
93 public:
94 LastFrameAccessor(JavaThread* thread) {
95 assert(thread == Thread::current(), "sanity");
96 _last_frame = thread->last_frame();
97 }
98 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
99 Method* method() const { return _last_frame.interpreter_frame_method(); }
100 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
101 int bci() const { return _last_frame.interpreter_frame_bci(); }
102 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
103
104 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
105 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
106
107 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
108 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
109
110 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
111 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
112 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
113 int get_index_u2_cpcache(Bytecodes::Code bc) const
114 { return bytecode().get_index_u2_cpcache(bc); }
115 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
116 int number_of_dimensions() const { return bcp()[3]; }
117 ConstantPoolCacheEntry* cache_entry_at(int i) const
118 { return method()->constants()->cache()->entry_at(i); }
119 ConstantPoolCacheEntry* cache_entry() const { return cache_entry_at(Bytes::get_native_u2(bcp() + 1)); }
120
121 oop callee_receiver(Symbol* signature) {
122 return _last_frame.interpreter_callee_receiver(signature);
123 }
124 BasicObjectLock* monitor_begin() const {
125 return _last_frame.interpreter_frame_monitor_begin();
126 }
127 BasicObjectLock* monitor_end() const {
128 return _last_frame.interpreter_frame_monitor_end();
129 }
130 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
131 return _last_frame.next_monitor_in_interpreter_frame(current);
132 }
133
134 frame& get_frame() { return _last_frame; }
135 };
136
137
138 bool InterpreterRuntime::is_breakpoint(JavaThread *thread) {
139 return Bytecodes::code_or_bp_at(LastFrameAccessor(thread).bcp()) == Bytecodes::_breakpoint;
140 }
141
142 //------------------------------------------------------------------------------------------------------------------------
143 // State accessors
144
145 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
146 LastFrameAccessor last_frame(thread);
147 last_frame.set_bcp(bcp);
148 if (ProfileInterpreter) {
149 // ProfileTraps uses MDOs independently of ProfileInterpreter.
150 // That is why we must check both ProfileInterpreter and mdo != NULL.
151 MethodData* mdo = last_frame.method()->method_data();
152 if (mdo != NULL) {
153 NEEDS_CLEANUP;
154 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
155 }
156 }
157 }
158
159 //------------------------------------------------------------------------------------------------------------------------
160 // Constants
161
162
163 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
164 // access constant pool
165 LastFrameAccessor last_frame(thread);
166 ConstantPool* pool = last_frame.method()->constants();
167 int index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
168 constantTag tag = pool->tag_at(index);
169
170 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
171 Klass* klass = pool->klass_at(index, CHECK);
172 oop java_class = klass->java_mirror();
173 thread->set_vm_result(java_class);
174 IRT_END
175
176 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
177 assert(bytecode == Bytecodes::_ldc ||
178 bytecode == Bytecodes::_ldc_w ||
179 bytecode == Bytecodes::_ldc2_w ||
180 bytecode == Bytecodes::_fast_aldc ||
181 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
182 ResourceMark rm(thread);
183 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
184 bytecode == Bytecodes::_fast_aldc_w);
185 LastFrameAccessor last_frame(thread);
186 methodHandle m (thread, last_frame.method());
187 Bytecode_loadconstant ldc(m, last_frame.bci());
188
189 // Double-check the size. (Condy can have any type.)
190 BasicType type = ldc.result_type();
191 switch (type2size[type]) {
192 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
193 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
194 default: ShouldNotReachHere();
195 }
196
197 // Resolve the constant. This does not do unboxing.
198 // But it does replace Universe::the_null_sentinel by null.
199 oop result = ldc.resolve_constant(CHECK);
200 assert(result != NULL || is_fast_aldc, "null result only valid for fast_aldc");
201
202 #ifdef ASSERT
203 {
204 // The bytecode wrappers aren't GC-safe so construct a new one
205 Bytecode_loadconstant ldc2(m, last_frame.bci());
206 int rindex = ldc2.cache_index();
207 if (rindex < 0)
208 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
209 if (rindex >= 0) {
210 oop coop = m->constants()->resolved_references()->obj_at(rindex);
211 oop roop = (result == NULL ? Universe::the_null_sentinel() : result);
212 assert(oopDesc::equals(roop, coop), "expected result for assembly code");
213 }
214 }
215 #endif
216 thread->set_vm_result(result);
217 if (!is_fast_aldc) {
218 // Tell the interpreter how to unbox the primitive.
219 guarantee(java_lang_boxing_object::is_instance(result, type), "");
220 int offset = java_lang_boxing_object::value_offset_in_bytes(type);
221 intptr_t flags = ((as_TosState(type) << ConstantPoolCacheEntry::tos_state_shift)
222 | (offset & ConstantPoolCacheEntry::field_index_mask));
223 thread->set_vm_result_2((Metadata*)flags);
224 }
225 }
226 IRT_END
227
228
229 //------------------------------------------------------------------------------------------------------------------------
230 // Allocation
231
232 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
233 Klass* k = pool->klass_at(index, CHECK);
234 InstanceKlass* klass = InstanceKlass::cast(k);
235
236 // Make sure we are not instantiating an abstract klass
237 klass->check_valid_for_instantiation(true, CHECK);
238
239 // Make sure klass is initialized
240 klass->initialize(CHECK);
241
242 // At this point the class may not be fully initialized
243 // because of recursive initialization. If it is fully
244 // initialized & has_finalized is not set, we rewrite
245 // it into its fast version (Note: no locking is needed
246 // here since this is an atomic byte write and can be
247 // done more than once).
248 //
249 // Note: In case of classes with has_finalized we don't
250 // rewrite since that saves us an extra check in
251 // the fast version which then would call the
252 // slow version anyway (and do a call back into
253 // Java).
254 // If we have a breakpoint, then we don't rewrite
255 // because the _breakpoint bytecode would be lost.
256 oop obj = klass->allocate_instance(CHECK);
257 thread->set_vm_result(obj);
258 IRT_END
259
260
261 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
262 oop obj = oopFactory::new_typeArray(type, size, CHECK);
263 thread->set_vm_result(obj);
264 IRT_END
265
266
267 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
268 Klass* klass = pool->klass_at(index, CHECK);
269 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
270 thread->set_vm_result(obj);
271 IRT_END
272
273
274 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
275 // We may want to pass in more arguments - could make this slightly faster
276 LastFrameAccessor last_frame(thread);
277 ConstantPool* constants = last_frame.method()->constants();
278 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
279 Klass* klass = constants->klass_at(i, CHECK);
280 int nof_dims = last_frame.number_of_dimensions();
281 assert(klass->is_klass(), "not a class");
282 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
283
284 // We must create an array of jints to pass to multi_allocate.
285 ResourceMark rm(thread);
286 const int small_dims = 10;
287 jint dim_array[small_dims];
288 jint *dims = &dim_array[0];
289 if (nof_dims > small_dims) {
290 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
291 }
292 for (int index = 0; index < nof_dims; index++) {
293 // offset from first_size_address is addressed as local[index]
294 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
295 dims[index] = first_size_address[n];
296 }
297 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
298 thread->set_vm_result(obj);
299 IRT_END
300
301
302 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
303 assert(oopDesc::is_oop(obj), "must be a valid oop");
304 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
305 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
306 IRT_END
307
308
309 // Quicken instance-of and check-cast bytecodes
310 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
311 // Force resolving; quicken the bytecode
312 LastFrameAccessor last_frame(thread);
313 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
314 ConstantPool* cpool = last_frame.method()->constants();
315 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
316 // program we might have seen an unquick'd bytecode in the interpreter but have another
317 // thread quicken the bytecode before we get here.
318 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
319 Klass* klass = cpool->klass_at(which, CHECK);
320 thread->set_vm_result_2(klass);
321 IRT_END
322
323
324 //------------------------------------------------------------------------------------------------------------------------
325 // Exceptions
326
327 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
328 const methodHandle& trap_method, int trap_bci, TRAPS) {
329 if (trap_method.not_null()) {
330 MethodData* trap_mdo = trap_method->method_data();
331 if (trap_mdo == NULL) {
332 Method::build_interpreter_method_data(trap_method, THREAD);
333 if (HAS_PENDING_EXCEPTION) {
334 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
335 "we expect only an OOM error here");
336 CLEAR_PENDING_EXCEPTION;
337 }
338 trap_mdo = trap_method->method_data();
339 // and fall through...
340 }
341 if (trap_mdo != NULL) {
342 // Update per-method count of trap events. The interpreter
343 // is updating the MDO to simulate the effect of compiler traps.
344 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
345 }
346 }
347 }
348
349 // Assume the compiler is (or will be) interested in this event.
350 // If necessary, create an MDO to hold the information, and record it.
351 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
352 assert(ProfileTraps, "call me only if profiling");
353 LastFrameAccessor last_frame(thread);
354 methodHandle trap_method(thread, last_frame.method());
355 int trap_bci = trap_method->bci_from(last_frame.bcp());
356 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
357 }
358
359 #ifdef CC_INTERP
360 // As legacy note_trap, but we have more arguments.
361 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
362 methodHandle trap_method(method);
363 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
364 IRT_END
365
366 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
367 // for each exception.
368 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
369 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
370 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
371 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
372 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
373 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
374 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
375 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
376 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
377 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
378 #endif // CC_INTERP
379
380
381 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
382 // get klass
383 InstanceKlass* klass = InstanceKlass::cast(k);
384 assert(klass->is_initialized(),
385 "this klass should have been initialized during VM initialization");
386 // create instance - do not call constructor since we may have no
387 // (java) stack space left (should assert constructor is empty)
388 Handle exception;
389 oop exception_oop = klass->allocate_instance(CHECK_(exception));
390 exception = Handle(THREAD, exception_oop);
391 if (StackTraceInThrowable) {
392 java_lang_Throwable::fill_in_stack_trace(exception);
393 }
394 return exception;
395 }
396
397 // Special handling for stack overflow: since we don't have any (java) stack
398 // space left we use the pre-allocated & pre-initialized StackOverflowError
399 // klass to create an stack overflow error instance. We do not call its
400 // constructor for the same reason (it is empty, anyway).
401 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
402 Handle exception = get_preinitialized_exception(
403 SystemDictionary::StackOverflowError_klass(),
404 CHECK);
405 // Increment counter for hs_err file reporting
406 Atomic::inc(&Exceptions::_stack_overflow_errors);
407 THROW_HANDLE(exception);
408 IRT_END
409
410 IRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
411 Handle exception = get_preinitialized_exception(
412 SystemDictionary::StackOverflowError_klass(),
413 CHECK);
414 java_lang_Throwable::set_message(exception(),
415 Universe::delayed_stack_overflow_error_message());
416 // Increment counter for hs_err file reporting
417 Atomic::inc(&Exceptions::_stack_overflow_errors);
418 THROW_HANDLE(exception);
419 IRT_END
420
421 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
422 // lookup exception klass
423 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
424 if (ProfileTraps) {
425 if (s == vmSymbols::java_lang_ArithmeticException()) {
426 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
427 } else if (s == vmSymbols::java_lang_NullPointerException()) {
428 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
429 }
430 }
431 // create exception
432 Handle exception = Exceptions::new_exception(thread, s, message);
433 thread->set_vm_result(exception());
434 IRT_END
435
436
437 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
438 // Produce the error message first because note_trap can safepoint
439 ResourceMark rm(thread);
440 const char* klass_name = obj->klass()->external_name();
441 // lookup exception klass
442 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
443 if (ProfileTraps) {
444 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
445 }
446 // create exception, with klass name as detail message
447 Handle exception = Exceptions::new_exception(thread, s, klass_name);
448 thread->set_vm_result(exception());
449 IRT_END
450
451 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, arrayOopDesc* a, jint index))
452 // Produce the error message first because note_trap can safepoint
453 ResourceMark rm(thread);
454 stringStream ss;
455 ss.print("Index %d out of bounds for length %d", index, a->length());
456
457 if (ProfileTraps) {
458 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
459 }
460
461 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
462 IRT_END
463
464 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
465 JavaThread* thread, oopDesc* obj))
466
467 // Produce the error message first because note_trap can safepoint
468 ResourceMark rm(thread);
469 char* message = SharedRuntime::generate_class_cast_message(
470 thread, obj->klass());
471
472 if (ProfileTraps) {
473 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
474 }
475
476 // create exception
477 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
478 IRT_END
479
480 // exception_handler_for_exception(...) returns the continuation address,
481 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
482 // The exception oop is returned to make sure it is preserved over GC (it
483 // is only on the stack if the exception was thrown explicitly via athrow).
484 // During this operation, the expression stack contains the values for the
485 // bci where the exception happened. If the exception was propagated back
486 // from a call, the expression stack contains the values for the bci at the
487 // invoke w/o arguments (i.e., as if one were inside the call).
488 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
489
490 LastFrameAccessor last_frame(thread);
491 Handle h_exception(thread, exception);
492 methodHandle h_method (thread, last_frame.method());
493 constantPoolHandle h_constants(thread, h_method->constants());
494 bool should_repeat;
495 int handler_bci;
496 int current_bci = last_frame.bci();
497
498 if (thread->frames_to_pop_failed_realloc() > 0) {
499 // Allocation of scalar replaced object used in this frame
500 // failed. Unconditionally pop the frame.
501 thread->dec_frames_to_pop_failed_realloc();
502 thread->set_vm_result(h_exception());
503 // If the method is synchronized we already unlocked the monitor
504 // during deoptimization so the interpreter needs to skip it when
505 // the frame is popped.
506 thread->set_do_not_unlock_if_synchronized(true);
507 #ifdef CC_INTERP
508 return (address) -1;
509 #else
510 return Interpreter::remove_activation_entry();
511 #endif
512 }
513
514 // Need to do this check first since when _do_not_unlock_if_synchronized
515 // is set, we don't want to trigger any classloading which may make calls
516 // into java, or surprisingly find a matching exception handler for bci 0
517 // since at this moment the method hasn't been "officially" entered yet.
518 if (thread->do_not_unlock_if_synchronized()) {
519 ResourceMark rm;
520 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
521 thread->set_vm_result(exception);
522 #ifdef CC_INTERP
523 return (address) -1;
524 #else
525 return Interpreter::remove_activation_entry();
526 #endif
527 }
528
529 do {
530 should_repeat = false;
531
532 // assertions
533 #ifdef ASSERT
534 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
535 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
536 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
537 if (ExitVMOnVerifyError) vm_exit(-1);
538 ShouldNotReachHere();
539 }
540 #endif
541
542 // tracing
543 if (log_is_enabled(Info, exceptions)) {
544 ResourceMark rm(thread);
545 stringStream tempst;
546 tempst.print("interpreter method <%s>\n"
547 " at bci %d for thread " INTPTR_FORMAT " (%s)",
548 h_method->print_value_string(), current_bci, p2i(thread), thread->name());
549 Exceptions::log_exception(h_exception, tempst);
550 }
551 // Don't go paging in something which won't be used.
552 // else if (extable->length() == 0) {
553 // // disabled for now - interpreter is not using shortcut yet
554 // // (shortcut is not to call runtime if we have no exception handlers)
555 // // warning("performance bug: should not call runtime if method has no exception handlers");
556 // }
557 // for AbortVMOnException flag
558 Exceptions::debug_check_abort(h_exception);
559
560 // exception handler lookup
561 Klass* klass = h_exception->klass();
562 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
563 if (HAS_PENDING_EXCEPTION) {
564 // We threw an exception while trying to find the exception handler.
565 // Transfer the new exception to the exception handle which will
566 // be set into thread local storage, and do another lookup for an
567 // exception handler for this exception, this time starting at the
568 // BCI of the exception handler which caused the exception to be
569 // thrown (bug 4307310).
570 h_exception = Handle(THREAD, PENDING_EXCEPTION);
571 CLEAR_PENDING_EXCEPTION;
572 if (handler_bci >= 0) {
573 current_bci = handler_bci;
574 should_repeat = true;
575 }
576 }
577 } while (should_repeat == true);
578
579 #if INCLUDE_JVMCI
580 if (EnableJVMCI && h_method->method_data() != NULL) {
581 ResourceMark rm(thread);
582 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);
583 if (pdata != NULL && pdata->is_BitData()) {
584 BitData* bit_data = (BitData*) pdata;
585 bit_data->set_exception_seen();
586 }
587 }
588 #endif
589
590 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
591 // time throw or a stack unwinding throw and accordingly notify the debugger
592 if (JvmtiExport::can_post_on_exceptions()) {
593 JvmtiExport::post_exception_throw(thread, h_method(), last_frame.bcp(), h_exception());
594 }
595
596 #ifdef CC_INTERP
597 address continuation = (address)(intptr_t) handler_bci;
598 #else
599 address continuation = NULL;
600 #endif
601 address handler_pc = NULL;
602 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
603 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
604 // handler in this method, or (b) after a stack overflow there is not yet
605 // enough stack space available to reprotect the stack.
606 #ifndef CC_INTERP
607 continuation = Interpreter::remove_activation_entry();
608 #endif
609 #if COMPILER2_OR_JVMCI
610 // Count this for compilation purposes
611 h_method->interpreter_throwout_increment(THREAD);
612 #endif
613 } else {
614 // handler in this method => change bci/bcp to handler bci/bcp and continue there
615 handler_pc = h_method->code_base() + handler_bci;
616 #ifndef CC_INTERP
617 set_bcp_and_mdp(handler_pc, thread);
618 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
619 #endif
620 }
621 // notify debugger of an exception catch
622 // (this is good for exceptions caught in native methods as well)
623 if (JvmtiExport::can_post_on_exceptions()) {
624 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
625 }
626
627 thread->set_vm_result(h_exception());
628 return continuation;
629 IRT_END
630
631
632 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
633 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
634 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
635 IRT_END
636
637
638 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
639 THROW(vmSymbols::java_lang_AbstractMethodError());
640 IRT_END
641
642 // This method is called from the "abstract_entry" of the interpreter.
643 // At that point, the arguments have already been removed from the stack
644 // and therefore we don't have the receiver object at our fingertips. (Though,
645 // on some platforms the receiver still resides in a register...). Thus,
646 // we have no choice but print an error message not containing the receiver
647 // type.
648 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* thread,
649 Method* missingMethod))
650 ResourceMark rm(thread);
651 assert(missingMethod != NULL, "sanity");
652 methodHandle m(thread, missingMethod);
653 LinkResolver::throw_abstract_method_error(m, THREAD);
654 IRT_END
655
656 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* thread,
657 Klass* recvKlass,
658 Method* missingMethod))
659 ResourceMark rm(thread);
660 methodHandle mh = methodHandle(thread, missingMethod);
661 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
662 IRT_END
663
664
665 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
666 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
667 IRT_END
668
669 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* thread,
670 Klass* recvKlass,
671 Klass* interfaceKlass))
672 ResourceMark rm(thread);
673 char buf[1000];
674 buf[0] = '\0';
675 jio_snprintf(buf, sizeof(buf),
676 "Class %s does not implement the requested interface %s",
677 recvKlass ? recvKlass->external_name() : "NULL",
678 interfaceKlass ? interfaceKlass->external_name() : "NULL");
679 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
680 IRT_END
681
682 //------------------------------------------------------------------------------------------------------------------------
683 // Fields
684 //
685
686 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) {
687 Thread* THREAD = thread;
688 // resolve field
689 fieldDescriptor info;
690 LastFrameAccessor last_frame(thread);
691 constantPoolHandle pool(thread, last_frame.method()->constants());
692 methodHandle m(thread, last_frame.method());
693 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
694 bytecode == Bytecodes::_putstatic);
695 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
696
697 {
698 JvmtiHideSingleStepping jhss(thread);
699 LinkResolver::resolve_field_access(info, pool, last_frame.get_index_u2_cpcache(bytecode),
700 m, bytecode, CHECK);
701 } // end JvmtiHideSingleStepping
702
703 // check if link resolution caused cpCache to be updated
704 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
705 if (cp_cache_entry->is_resolved(bytecode)) return;
706
707 // compute auxiliary field attributes
708 TosState state = as_TosState(info.field_type());
709
710 // Resolution of put instructions on final fields is delayed. That is required so that
711 // exceptions are thrown at the correct place (when the instruction is actually invoked).
712 // If we do not resolve an instruction in the current pass, leaving the put_code
713 // set to zero will cause the next put instruction to the same field to reresolve.
714
715 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
716 // to final instance fields with updates originating from a method different than <init>)
717 // is inhibited. A putfield instruction targeting an instance final field must throw
718 // an IllegalAccessError if the instruction is not in an instance
719 // initializer method <init>. If resolution were not inhibited, a putfield
720 // in an initializer method could be resolved in the initializer. Subsequent
721 // putfield instructions to the same field would then use cached information.
722 // As a result, those instructions would not pass through the VM. That is,
723 // checks in resolve_field_access() would not be executed for those instructions
724 // and the required IllegalAccessError would not be thrown.
725 //
726 // Also, we need to delay resolving getstatic and putstatic instructions until the
727 // class is initialized. This is required so that access to the static
728 // field will call the initialization function every time until the class
729 // is completely initialized ala. in 2.17.5 in JVM Specification.
730 InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
731 bool uninitialized_static = is_static && !klass->is_initialized();
732 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
733 info.has_initialized_final_update();
734 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
735
736 Bytecodes::Code get_code = (Bytecodes::Code)0;
737 Bytecodes::Code put_code = (Bytecodes::Code)0;
738 if (!uninitialized_static) {
739 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
740 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
741 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
742 }
743 }
744
745 cp_cache_entry->set_field(
746 get_code,
747 put_code,
748 info.field_holder(),
749 info.index(),
750 info.offset(),
751 state,
752 info.access_flags().is_final(),
753 info.access_flags().is_volatile(),
754 pool->pool_holder()
755 );
756 }
757
758
759 //------------------------------------------------------------------------------------------------------------------------
760 // Synchronization
761 //
762 // The interpreter's synchronization code is factored out so that it can
763 // be shared by method invocation and synchronized blocks.
764 //%note synchronization_3
765
766 //%note monitor_1
767 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
768 #ifdef ASSERT
769 thread->last_frame().interpreter_frame_verify_monitor(elem);
770 #endif
771 if (PrintBiasedLockingStatistics) {
772 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
773 }
774 Handle h_obj(thread, elem->obj());
775 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
776 "must be NULL or an object");
777 if (UseBiasedLocking) {
778 // Retry fast entry if bias is revoked to avoid unnecessary inflation
779 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
780 } else {
781 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
782 }
783 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
784 "must be NULL or an object");
785 #ifdef ASSERT
786 thread->last_frame().interpreter_frame_verify_monitor(elem);
787 #endif
788 IRT_END
789
790
791 //%note monitor_1
792 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
793 #ifdef ASSERT
794 thread->last_frame().interpreter_frame_verify_monitor(elem);
795 #endif
796 Handle h_obj(thread, elem->obj());
797 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
798 "must be NULL or an object");
799 if (elem == NULL || h_obj()->is_unlocked()) {
800 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
801 }
802 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
803 // Free entry. This must be done here, since a pending exception might be installed on
804 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
805 elem->set_obj(NULL);
806 #ifdef ASSERT
807 thread->last_frame().interpreter_frame_verify_monitor(elem);
808 #endif
809 IRT_END
810
811
812 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
813 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
814 IRT_END
815
816
817 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
818 // Returns an illegal exception to install into the current thread. The
819 // pending_exception flag is cleared so normal exception handling does not
820 // trigger. Any current installed exception will be overwritten. This
821 // method will be called during an exception unwind.
822
823 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
824 Handle exception(thread, thread->vm_result());
825 assert(exception() != NULL, "vm result should be set");
826 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
827 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
828 exception = get_preinitialized_exception(
829 SystemDictionary::IllegalMonitorStateException_klass(),
830 CATCH);
831 }
832 thread->set_vm_result(exception());
833 IRT_END
834
835
836 //------------------------------------------------------------------------------------------------------------------------
837 // Invokes
838
839 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
840 return method->orig_bytecode_at(method->bci_from(bcp));
841 IRT_END
842
843 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
844 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
845 IRT_END
846
847 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
848 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
849 IRT_END
850
851 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) {
852 Thread* THREAD = thread;
853 LastFrameAccessor last_frame(thread);
854 // extract receiver from the outgoing argument list if necessary
855 Handle receiver(thread, NULL);
856 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
857 bytecode == Bytecodes::_invokespecial) {
858 ResourceMark rm(thread);
859 methodHandle m (thread, last_frame.method());
860 Bytecode_invoke call(m, last_frame.bci());
861 Symbol* signature = call.signature();
862 receiver = Handle(thread, last_frame.callee_receiver(signature));
863
864 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
865 "sanity check");
866 assert(receiver.is_null() ||
867 !Universe::heap()->is_in_reserved(receiver->klass()),
868 "sanity check");
869 }
870
871 // resolve method
872 CallInfo info;
873 constantPoolHandle pool(thread, last_frame.method()->constants());
874
875 {
876 JvmtiHideSingleStepping jhss(thread);
877 LinkResolver::resolve_invoke(info, receiver, pool,
878 last_frame.get_index_u2_cpcache(bytecode), bytecode,
879 CHECK);
880 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
881 int retry_count = 0;
882 while (info.resolved_method()->is_old()) {
883 // It is very unlikely that method is redefined more than 100 times
884 // in the middle of resolve. If it is looping here more than 100 times
885 // means then there could be a bug here.
886 guarantee((retry_count++ < 100),
887 "Could not resolve to latest version of redefined method");
888 // method is redefined in the middle of resolve so re-try.
889 LinkResolver::resolve_invoke(info, receiver, pool,
890 last_frame.get_index_u2_cpcache(bytecode), bytecode,
891 CHECK);
892 }
893 }
894 } // end JvmtiHideSingleStepping
895
896 // check if link resolution caused cpCache to be updated
897 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
898 if (cp_cache_entry->is_resolved(bytecode)) return;
899
900 #ifdef ASSERT
901 if (bytecode == Bytecodes::_invokeinterface) {
902 if (info.resolved_method()->method_holder() ==
903 SystemDictionary::Object_klass()) {
904 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
905 // (see also CallInfo::set_interface for details)
906 assert(info.call_kind() == CallInfo::vtable_call ||
907 info.call_kind() == CallInfo::direct_call, "");
908 methodHandle rm = info.resolved_method();
909 assert(rm->is_final() || info.has_vtable_index(),
910 "should have been set already");
911 } else if (!info.resolved_method()->has_itable_index()) {
912 // Resolved something like CharSequence.toString. Use vtable not itable.
913 assert(info.call_kind() != CallInfo::itable_call, "");
914 } else {
915 // Setup itable entry
916 assert(info.call_kind() == CallInfo::itable_call, "");
917 int index = info.resolved_method()->itable_index();
918 assert(info.itable_index() == index, "");
919 }
920 } else if (bytecode == Bytecodes::_invokespecial) {
921 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
922 } else {
923 assert(info.call_kind() == CallInfo::direct_call ||
924 info.call_kind() == CallInfo::vtable_call, "");
925 }
926 #endif
927 // Get sender or sender's host_klass, and only set cpCache entry to resolved if
928 // it is not an interface. The receiver for invokespecial calls within interface
929 // methods must be checked for every call.
930 InstanceKlass* sender = pool->pool_holder();
931 sender = sender->has_host_klass() ? sender->host_klass() : sender;
932
933 switch (info.call_kind()) {
934 case CallInfo::direct_call:
935 cp_cache_entry->set_direct_call(
936 bytecode,
937 info.resolved_method(),
938 sender->is_interface());
939 break;
940 case CallInfo::vtable_call:
941 cp_cache_entry->set_vtable_call(
942 bytecode,
943 info.resolved_method(),
944 info.vtable_index());
945 break;
946 case CallInfo::itable_call:
947 cp_cache_entry->set_itable_call(
948 bytecode,
949 info.resolved_klass(),
950 info.resolved_method(),
951 info.itable_index());
952 break;
953 default: ShouldNotReachHere();
954 }
955 }
956
957
958 // First time execution: Resolve symbols, create a permanent MethodType object.
959 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) {
960 Thread* THREAD = thread;
961 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
962 LastFrameAccessor last_frame(thread);
963
964 // resolve method
965 CallInfo info;
966 constantPoolHandle pool(thread, last_frame.method()->constants());
967 {
968 JvmtiHideSingleStepping jhss(thread);
969 LinkResolver::resolve_invoke(info, Handle(), pool,
970 last_frame.get_index_u2_cpcache(bytecode), bytecode,
971 CHECK);
972 } // end JvmtiHideSingleStepping
973
974 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
975 cp_cache_entry->set_method_handle(pool, info);
976 }
977
978 // First time execution: Resolve symbols, create a permanent CallSite object.
979 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) {
980 Thread* THREAD = thread;
981 LastFrameAccessor last_frame(thread);
982 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
983
984 //TO DO: consider passing BCI to Java.
985 // int caller_bci = last_frame.method()->bci_from(last_frame.bcp());
986
987 // resolve method
988 CallInfo info;
989 constantPoolHandle pool(thread, last_frame.method()->constants());
990 int index = last_frame.get_index_u4(bytecode);
991 {
992 JvmtiHideSingleStepping jhss(thread);
993 LinkResolver::resolve_invoke(info, Handle(), pool,
994 index, bytecode, CHECK);
995 } // end JvmtiHideSingleStepping
996
997 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
998 cp_cache_entry->set_dynamic_call(pool, info);
999 }
1000
1001 // This function is the interface to the assembly code. It returns the resolved
1002 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
1003 // This function will check for redefinition!
1004 IRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) {
1005 switch (bytecode) {
1006 case Bytecodes::_getstatic:
1007 case Bytecodes::_putstatic:
1008 case Bytecodes::_getfield:
1009 case Bytecodes::_putfield:
1010 resolve_get_put(thread, bytecode);
1011 break;
1012 case Bytecodes::_invokevirtual:
1013 case Bytecodes::_invokespecial:
1014 case Bytecodes::_invokestatic:
1015 case Bytecodes::_invokeinterface:
1016 resolve_invoke(thread, bytecode);
1017 break;
1018 case Bytecodes::_invokehandle:
1019 resolve_invokehandle(thread);
1020 break;
1021 case Bytecodes::_invokedynamic:
1022 resolve_invokedynamic(thread);
1023 break;
1024 default:
1025 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1026 break;
1027 }
1028 }
1029 IRT_END
1030
1031 //------------------------------------------------------------------------------------------------------------------------
1032 // Miscellaneous
1033
1034
1035 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
1036 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
1037 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
1038 if (branch_bcp != NULL && nm != NULL) {
1039 // This was a successful request for an OSR nmethod. Because
1040 // frequency_counter_overflow_inner ends with a safepoint check,
1041 // nm could have been unloaded so look it up again. It's unsafe
1042 // to examine nm directly since it might have been freed and used
1043 // for something else.
1044 LastFrameAccessor last_frame(thread);
1045 Method* method = last_frame.method();
1046 int bci = method->bci_from(last_frame.bcp());
1047 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1048 }
1049 if (nm != NULL && thread->is_interp_only_mode()) {
1050 // Normally we never get an nm if is_interp_only_mode() is true, because
1051 // policy()->event has a check for this and won't compile the method when
1052 // true. However, it's possible for is_interp_only_mode() to become true
1053 // during the compilation. We don't want to return the nm in that case
1054 // because we want to continue to execute interpreted.
1055 nm = NULL;
1056 }
1057 #ifndef PRODUCT
1058 if (TraceOnStackReplacement) {
1059 if (nm != NULL) {
1060 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1061 nm->print();
1062 }
1063 }
1064 #endif
1065 return nm;
1066 }
1067
1068 IRT_ENTRY(nmethod*,
1069 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
1070 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1071 // flag, in case this method triggers classloading which will call into Java.
1072 UnlockFlagSaver fs(thread);
1073
1074 LastFrameAccessor last_frame(thread);
1075 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1076 methodHandle method(thread, last_frame.method());
1077 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
1078 const int bci = branch_bcp != NULL ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1079
1080 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
1081 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
1082 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
1083
1084 if (osr_nm != NULL) {
1085 // We may need to do on-stack replacement which requires that no
1086 // monitors in the activation are biased because their
1087 // BasicObjectLocks will need to migrate during OSR. Force
1088 // unbiasing of all monitors in the activation now (even though
1089 // the OSR nmethod might be invalidated) because we don't have a
1090 // safepoint opportunity later once the migration begins.
1091 if (UseBiasedLocking) {
1092 ResourceMark rm;
1093 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
1094 for( BasicObjectLock *kptr = last_frame.monitor_end();
1095 kptr < last_frame.monitor_begin();
1096 kptr = last_frame.next_monitor(kptr) ) {
1097 if( kptr->obj() != NULL ) {
1098 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
1099 }
1100 }
1101 BiasedLocking::revoke(objects_to_revoke);
1102 }
1103 }
1104 return osr_nm;
1105 IRT_END
1106
1107 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1108 assert(ProfileInterpreter, "must be profiling interpreter");
1109 int bci = method->bci_from(cur_bcp);
1110 MethodData* mdo = method->method_data();
1111 if (mdo == NULL) return 0;
1112 return mdo->bci_to_di(bci);
1113 IRT_END
1114
1115 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
1116 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1117 // flag, in case this method triggers classloading which will call into Java.
1118 UnlockFlagSaver fs(thread);
1119
1120 assert(ProfileInterpreter, "must be profiling interpreter");
1121 LastFrameAccessor last_frame(thread);
1122 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1123 methodHandle method(thread, last_frame.method());
1124 Method::build_interpreter_method_data(method, THREAD);
1125 if (HAS_PENDING_EXCEPTION) {
1126 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1127 CLEAR_PENDING_EXCEPTION;
1128 // and fall through...
1129 }
1130 IRT_END
1131
1132
1133 #ifdef ASSERT
1134 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1135 assert(ProfileInterpreter, "must be profiling interpreter");
1136
1137 MethodData* mdo = method->method_data();
1138 assert(mdo != NULL, "must not be null");
1139
1140 int bci = method->bci_from(bcp);
1141
1142 address mdp2 = mdo->bci_to_dp(bci);
1143 if (mdp != mdp2) {
1144 ResourceMark rm;
1145 ResetNoHandleMark rnm; // In a LEAF entry.
1146 HandleMark hm;
1147 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1148 int current_di = mdo->dp_to_di(mdp);
1149 int expected_di = mdo->dp_to_di(mdp2);
1150 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1151 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1152 int approx_bci = -1;
1153 if (current_di >= 0) {
1154 approx_bci = mdo->data_at(current_di)->bci();
1155 }
1156 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1157 mdo->print_on(tty);
1158 method->print_codes();
1159 }
1160 assert(mdp == mdp2, "wrong mdp");
1161 IRT_END
1162 #endif // ASSERT
1163
1164 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
1165 assert(ProfileInterpreter, "must be profiling interpreter");
1166 ResourceMark rm(thread);
1167 HandleMark hm(thread);
1168 LastFrameAccessor last_frame(thread);
1169 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1170 MethodData* h_mdo = last_frame.method()->method_data();
1171
1172 // Grab a lock to ensure atomic access to setting the return bci and
1173 // the displacement. This can block and GC, invalidating all naked oops.
1174 MutexLocker ml(RetData_lock);
1175
1176 // ProfileData is essentially a wrapper around a derived oop, so we
1177 // need to take the lock before making any ProfileData structures.
1178 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1179 guarantee(data != NULL, "profile data must be valid");
1180 RetData* rdata = data->as_RetData();
1181 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1182 last_frame.set_mdp(new_mdp);
1183 IRT_END
1184
1185 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
1186 MethodCounters* mcs = Method::build_method_counters(m, thread);
1187 if (HAS_PENDING_EXCEPTION) {
1188 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1189 CLEAR_PENDING_EXCEPTION;
1190 }
1191 return mcs;
1192 IRT_END
1193
1194
1195 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
1196 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1197 // stack traversal automatically takes care of preserving arguments for invoke, so
1198 // this is no longer needed.
1199
1200 // IRT_END does an implicit safepoint check, hence we are guaranteed to block
1201 // if this is called during a safepoint
1202
1203 if (JvmtiExport::should_post_single_step()) {
1204 // We are called during regular safepoints and when the VM is
1205 // single stepping. If any thread is marked for single stepping,
1206 // then we may have JVMTI work to do.
1207 LastFrameAccessor last_frame(thread);
1208 JvmtiExport::at_single_stepping_point(thread, last_frame.method(), last_frame.bcp());
1209 }
1210 IRT_END
1211
1212 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1213 ConstantPoolCacheEntry *cp_entry))
1214
1215 // check the access_flags for the field in the klass
1216
1217 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1218 int index = cp_entry->field_index();
1219 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1220
1221 bool is_static = (obj == NULL);
1222 HandleMark hm(thread);
1223
1224 Handle h_obj;
1225 if (!is_static) {
1226 // non-static field accessors have an object, but we need a handle
1227 h_obj = Handle(thread, obj);
1228 }
1229 InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1230 jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);
1231 LastFrameAccessor last_frame(thread);
1232 JvmtiExport::post_field_access(thread, last_frame.method(), last_frame.bcp(), cp_entry_f1, h_obj, fid);
1233 IRT_END
1234
1235 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1236 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1237
1238 Klass* k = cp_entry->f1_as_klass();
1239
1240 // check the access_flags for the field in the klass
1241 InstanceKlass* ik = InstanceKlass::cast(k);
1242 int index = cp_entry->field_index();
1243 // bail out if field modifications are not watched
1244 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1245
1246 char sig_type = '\0';
1247
1248 switch(cp_entry->flag_state()) {
1249 case btos: sig_type = 'B'; break;
1250 case ztos: sig_type = 'Z'; break;
1251 case ctos: sig_type = 'C'; break;
1252 case stos: sig_type = 'S'; break;
1253 case itos: sig_type = 'I'; break;
1254 case ftos: sig_type = 'F'; break;
1255 case atos: sig_type = 'L'; break;
1256 case ltos: sig_type = 'J'; break;
1257 case dtos: sig_type = 'D'; break;
1258 default: ShouldNotReachHere(); return;
1259 }
1260 bool is_static = (obj == NULL);
1261
1262 HandleMark hm(thread);
1263 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);
1264 jvalue fvalue;
1265 #ifdef _LP64
1266 fvalue = *value;
1267 #else
1268 // Long/double values are stored unaligned and also noncontiguously with
1269 // tagged stacks. We can't just do a simple assignment even in the non-
1270 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1271 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1272 // We assume that the two halves of longs/doubles are stored in interpreter
1273 // stack slots in platform-endian order.
1274 jlong_accessor u;
1275 jint* newval = (jint*)value;
1276 u.words[0] = newval[0];
1277 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1278 fvalue.j = u.long_value;
1279 #endif // _LP64
1280
1281 Handle h_obj;
1282 if (!is_static) {
1283 // non-static field accessors have an object, but we need a handle
1284 h_obj = Handle(thread, obj);
1285 }
1286
1287 LastFrameAccessor last_frame(thread);
1288 JvmtiExport::post_raw_field_modification(thread, last_frame.method(), last_frame.bcp(), ik, h_obj,
1289 fid, sig_type, &fvalue);
1290 IRT_END
1291
1292 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1293 LastFrameAccessor last_frame(thread);
1294 JvmtiExport::post_method_entry(thread, last_frame.method(), last_frame.get_frame());
1295 IRT_END
1296
1297
1298 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1299 LastFrameAccessor last_frame(thread);
1300 JvmtiExport::post_method_exit(thread, last_frame.method(), last_frame.get_frame());
1301 IRT_END
1302
1303 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1304 {
1305 return (Interpreter::contains(pc) ? 1 : 0);
1306 }
1307 IRT_END
1308
1309
1310 // Implementation of SignatureHandlerLibrary
1311
1312 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1313 // Dummy definition (else normalization method is defined in CPU
1314 // dependant code)
1315 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1316 return fingerprint;
1317 }
1318 #endif
1319
1320 address SignatureHandlerLibrary::set_handler_blob() {
1321 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1322 if (handler_blob == NULL) {
1323 return NULL;
1324 }
1325 address handler = handler_blob->code_begin();
1326 _handler_blob = handler_blob;
1327 _handler = handler;
1328 return handler;
1329 }
1330
1331 void SignatureHandlerLibrary::initialize() {
1332 if (_fingerprints != NULL) {
1333 return;
1334 }
1335 if (set_handler_blob() == NULL) {
1336 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1337 }
1338
1339 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1340 SignatureHandlerLibrary::buffer_size);
1341 _buffer = bb->code_begin();
1342
1343 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1344 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1345 }
1346
1347 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1348 address handler = _handler;
1349 int insts_size = buffer->pure_insts_size();
1350 if (handler + insts_size > _handler_blob->code_end()) {
1351 // get a new handler blob
1352 handler = set_handler_blob();
1353 }
1354 if (handler != NULL) {
1355 memcpy(handler, buffer->insts_begin(), insts_size);
1356 pd_set_handler(handler);
1357 ICache::invalidate_range(handler, insts_size);
1358 _handler = handler + insts_size;
1359 }
1360 return handler;
1361 }
1362
1363 void SignatureHandlerLibrary::add(const methodHandle& method) {
1364 if (method->signature_handler() == NULL) {
1365 // use slow signature handler if we can't do better
1366 int handler_index = -1;
1367 // check if we can use customized (fast) signature handler
1368 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1369 // use customized signature handler
1370 MutexLocker mu(SignatureHandlerLibrary_lock);
1371 // make sure data structure is initialized
1372 initialize();
1373 // lookup method signature's fingerprint
1374 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1375 // allow CPU dependant code to optimize the fingerprints for the fast handler
1376 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1377 handler_index = _fingerprints->find(fingerprint);
1378 // create handler if necessary
1379 if (handler_index < 0) {
1380 ResourceMark rm;
1381 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1382 CodeBuffer buffer((address)(_buffer + align_offset),
1383 SignatureHandlerLibrary::buffer_size - align_offset);
1384 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1385 // copy into code heap
1386 address handler = set_handler(&buffer);
1387 if (handler == NULL) {
1388 // use slow signature handler (without memorizing it in the fingerprints)
1389 } else {
1390 // debugging suppport
1391 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1392 ttyLocker ttyl;
1393 tty->cr();
1394 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1395 _handlers->length(),
1396 (method->is_static() ? "static" : "receiver"),
1397 method->name_and_sig_as_C_string(),
1398 fingerprint,
1399 buffer.insts_size());
1400 if (buffer.insts_size() > 0) {
1401 Disassembler::decode(handler, handler + buffer.insts_size());
1402 }
1403 #ifndef PRODUCT
1404 address rh_begin = Interpreter::result_handler(method()->result_type());
1405 if (CodeCache::contains(rh_begin)) {
1406 // else it might be special platform dependent values
1407 tty->print_cr(" --- associated result handler ---");
1408 address rh_end = rh_begin;
1409 while (*(int*)rh_end != 0) {
1410 rh_end += sizeof(int);
1411 }
1412 Disassembler::decode(rh_begin, rh_end);
1413 } else {
1414 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1415 }
1416 #endif
1417 }
1418 // add handler to library
1419 _fingerprints->append(fingerprint);
1420 _handlers->append(handler);
1421 // set handler index
1422 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1423 handler_index = _fingerprints->length() - 1;
1424 }
1425 }
1426 // Set handler under SignatureHandlerLibrary_lock
1427 if (handler_index < 0) {
1428 // use generic signature handler
1429 method->set_signature_handler(Interpreter::slow_signature_handler());
1430 } else {
1431 // set handler
1432 method->set_signature_handler(_handlers->at(handler_index));
1433 }
1434 } else {
1435 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1436 // use generic signature handler
1437 method->set_signature_handler(Interpreter::slow_signature_handler());
1438 }
1439 }
1440 #ifdef ASSERT
1441 int handler_index = -1;
1442 int fingerprint_index = -2;
1443 {
1444 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1445 // in any way if accessed from multiple threads. To avoid races with another
1446 // thread which may change the arrays in the above, mutex protected block, we
1447 // have to protect this read access here with the same mutex as well!
1448 MutexLocker mu(SignatureHandlerLibrary_lock);
1449 if (_handlers != NULL) {
1450 handler_index = _handlers->find(method->signature_handler());
1451 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1452 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1453 fingerprint_index = _fingerprints->find(fingerprint);
1454 }
1455 }
1456 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1457 handler_index == fingerprint_index, "sanity check");
1458 #endif // ASSERT
1459 }
1460
1461 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1462 int handler_index = -1;
1463 // use customized signature handler
1464 MutexLocker mu(SignatureHandlerLibrary_lock);
1465 // make sure data structure is initialized
1466 initialize();
1467 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1468 handler_index = _fingerprints->find(fingerprint);
1469 // create handler if necessary
1470 if (handler_index < 0) {
1471 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1472 tty->cr();
1473 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1474 _handlers->length(),
1475 p2i(handler),
1476 fingerprint);
1477 }
1478 _fingerprints->append(fingerprint);
1479 _handlers->append(handler);
1480 } else {
1481 if (PrintSignatureHandlers) {
1482 tty->cr();
1483 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1484 _handlers->length(),
1485 fingerprint,
1486 p2i(_handlers->at(handler_index)),
1487 p2i(handler));
1488 }
1489 }
1490 }
1491
1492
1493 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1494 address SignatureHandlerLibrary::_handler = NULL;
1495 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1496 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1497 address SignatureHandlerLibrary::_buffer = NULL;
1498
1499
1500 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1501 methodHandle m(thread, method);
1502 assert(m->is_native(), "sanity check");
1503 // lookup native function entry point if it doesn't exist
1504 bool in_base_library;
1505 if (!m->has_native_function()) {
1506 NativeLookup::lookup(m, in_base_library, CHECK);
1507 }
1508 // make sure signature handler is installed
1509 SignatureHandlerLibrary::add(m);
1510 // The interpreter entry point checks the signature handler first,
1511 // before trying to fetch the native entry point and klass mirror.
1512 // We must set the signature handler last, so that multiple processors
1513 // preparing the same method will be sure to see non-null entry & mirror.
1514 IRT_END
1515
1516 #if defined(IA32) || defined(AMD64) || defined(ARM)
1517 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1518 if (src_address == dest_address) {
1519 return;
1520 }
1521 ResetNoHandleMark rnm; // In a LEAF entry.
1522 HandleMark hm;
1523 ResourceMark rm;
1524 LastFrameAccessor last_frame(thread);
1525 assert(last_frame.is_interpreted_frame(), "");
1526 jint bci = last_frame.bci();
1527 methodHandle mh(thread, last_frame.method());
1528 Bytecode_invoke invoke(mh, bci);
1529 ArgumentSizeComputer asc(invoke.signature());
1530 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1531 Copy::conjoint_jbytes(src_address, dest_address,
1532 size_of_arguments * Interpreter::stackElementSize);
1533 IRT_END
1534 #endif
1535
1536 #if INCLUDE_JVMTI
1537 // This is a support of the JVMTI PopFrame interface.
1538 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1539 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1540 // The member_name argument is a saved reference (in local#0) to the member_name.
1541 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1542 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1543 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1544 Method* method, address bcp))
1545 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1546 if (code != Bytecodes::_invokestatic) {
1547 return;
1548 }
1549 ConstantPool* cpool = method->constants();
1550 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1551 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1552 Symbol* mname = cpool->name_ref_at(cp_index);
1553
1554 if (MethodHandles::has_member_arg(cname, mname)) {
1555 oop member_name_oop = (oop) member_name;
1556 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1557 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1558 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1559 }
1560 thread->set_vm_result(member_name_oop);
1561 } else {
1562 thread->set_vm_result(NULL);
1563 }
1564 IRT_END
1565 #endif // INCLUDE_JVMTI
1566
1567 #ifndef PRODUCT
1568 // This must be a IRT_LEAF function because the interpreter must save registers on x86 to
1569 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1570 // The generated code still uses call_VM because that will set up the frame pointer for
1571 // bcp and method.
1572 IRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1573 LastFrameAccessor last_frame(thread);
1574 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1575 methodHandle mh(thread, last_frame.method());
1576 BytecodeTracer::trace(mh, last_frame.bcp(), tos, tos2);
1577 return preserve_this_value;
1578 IRT_END
1579 #endif // !PRODUCT