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