1 /*
2 * Copyright (c) 1997, 2017, 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.inline.hpp"
41 #include "oops/constantPool.hpp"
42 #include "oops/instanceKlass.hpp"
43 #include "oops/methodData.hpp"
44 #include "oops/objArrayKlass.hpp"
45 #include "oops/objArrayOop.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/symbol.hpp"
48 #include "prims/jvmtiExport.hpp"
49 #include "prims/nativeLookup.hpp"
50 #include "runtime/atomic.hpp"
51 #include "runtime/biasedLocking.hpp"
52 #include "runtime/compilationPolicy.hpp"
53 #include "runtime/deoptimization.hpp"
54 #include "runtime/fieldDescriptor.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/icache.hpp"
57 #include "runtime/interfaceSupport.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/jfieldIDWorkaround.hpp"
60 #include "runtime/osThread.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "runtime/stubRoutines.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/threadCritical.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/events.hpp"
67 #ifdef COMPILER2
68 #include "opto/runtime.hpp"
69 #endif
70
71 class UnlockFlagSaver {
72 private:
73 JavaThread* _thread;
74 bool _do_not_unlock;
75 public:
76 UnlockFlagSaver(JavaThread* t) {
77 _thread = t;
78 _do_not_unlock = t->do_not_unlock_if_synchronized();
79 t->set_do_not_unlock_if_synchronized(false);
80 }
81 ~UnlockFlagSaver() {
82 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
83 }
84 };
85
86 //------------------------------------------------------------------------------------------------------------------------
87 // State accessors
88
89 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
90 last_frame(thread).interpreter_frame_set_bcp(bcp);
91 if (ProfileInterpreter) {
92 // ProfileTraps uses MDOs independently of ProfileInterpreter.
93 // That is why we must check both ProfileInterpreter and mdo != NULL.
94 MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
95 if (mdo != NULL) {
96 NEEDS_CLEANUP;
97 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
98 }
99 }
100 }
101
102 //------------------------------------------------------------------------------------------------------------------------
103 // Constants
104
105
106 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
107 // access constant pool
108 ConstantPool* pool = method(thread)->constants();
109 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
110 constantTag tag = pool->tag_at(index);
111
112 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
113 Klass* klass = pool->klass_at(index, CHECK);
114 oop java_class = klass->java_mirror();
115 thread->set_vm_result(java_class);
116 IRT_END
117
118 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
119 assert(bytecode == Bytecodes::_fast_aldc ||
120 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
121 ResourceMark rm(thread);
122 methodHandle m (thread, method(thread));
123 Bytecode_loadconstant ldc(m, bci(thread));
124 oop result = ldc.resolve_constant(CHECK);
125 #ifdef ASSERT
126 {
127 // The bytecode wrappers aren't GC-safe so construct a new one
128 Bytecode_loadconstant ldc2(m, bci(thread));
129 oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
130 assert(result == coop, "expected result for assembly code");
131 }
132 #endif
133 thread->set_vm_result(result);
134 }
135 IRT_END
136
137
138 //------------------------------------------------------------------------------------------------------------------------
139 // Allocation
140
141 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
142 Klass* k = pool->klass_at(index, CHECK);
143 InstanceKlass* klass = InstanceKlass::cast(k);
144
145 // Make sure we are not instantiating an abstract klass
146 klass->check_valid_for_instantiation(true, CHECK);
147
148 // Make sure klass is initialized
149 klass->initialize(CHECK);
150
151 // At this point the class may not be fully initialized
152 // because of recursive initialization. If it is fully
153 // initialized & has_finalized is not set, we rewrite
154 // it into its fast version (Note: no locking is needed
155 // here since this is an atomic byte write and can be
156 // done more than once).
157 //
158 // Note: In case of classes with has_finalized we don't
159 // rewrite since that saves us an extra check in
160 // the fast version which then would call the
161 // slow version anyway (and do a call back into
162 // Java).
163 // If we have a breakpoint, then we don't rewrite
164 // because the _breakpoint bytecode would be lost.
165 oop obj = klass->allocate_instance(CHECK);
166 thread->set_vm_result(obj);
167 IRT_END
168
169
170 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
171 oop obj = oopFactory::new_typeArray(type, size, CHECK);
172 thread->set_vm_result(obj);
173 IRT_END
174
175
176 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
177 Klass* klass = pool->klass_at(index, CHECK);
178 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
179 thread->set_vm_result(obj);
180 IRT_END
181
182
183 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
184 // We may want to pass in more arguments - could make this slightly faster
185 ConstantPool* constants = method(thread)->constants();
186 int i = get_index_u2(thread, Bytecodes::_multianewarray);
187 Klass* klass = constants->klass_at(i, CHECK);
188 int nof_dims = number_of_dimensions(thread);
189 assert(klass->is_klass(), "not a class");
190 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
191
192 // We must create an array of jints to pass to multi_allocate.
193 ResourceMark rm(thread);
194 const int small_dims = 10;
195 jint dim_array[small_dims];
196 jint *dims = &dim_array[0];
197 if (nof_dims > small_dims) {
198 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
199 }
200 for (int index = 0; index < nof_dims; index++) {
201 // offset from first_size_address is addressed as local[index]
202 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
203 dims[index] = first_size_address[n];
204 }
205 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
206 thread->set_vm_result(obj);
207 IRT_END
208
209
210 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
211 assert(obj->is_oop(), "must be a valid oop");
212 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
213 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
214 IRT_END
215
216
217 // Quicken instance-of and check-cast bytecodes
218 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
219 // Force resolving; quicken the bytecode
220 int which = get_index_u2(thread, Bytecodes::_checkcast);
221 ConstantPool* cpool = method(thread)->constants();
222 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
223 // program we might have seen an unquick'd bytecode in the interpreter but have another
224 // thread quicken the bytecode before we get here.
225 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
226 Klass* klass = cpool->klass_at(which, CHECK);
227 thread->set_vm_result_2(klass);
228 IRT_END
229
230
231 //------------------------------------------------------------------------------------------------------------------------
232 // Exceptions
233
234 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
235 methodHandle trap_method, int trap_bci, TRAPS) {
236 if (trap_method.not_null()) {
237 MethodData* trap_mdo = trap_method->method_data();
238 if (trap_mdo == NULL) {
239 Method::build_interpreter_method_data(trap_method, THREAD);
240 if (HAS_PENDING_EXCEPTION) {
241 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
242 "we expect only an OOM error here");
243 CLEAR_PENDING_EXCEPTION;
244 }
245 trap_mdo = trap_method->method_data();
246 // and fall through...
247 }
248 if (trap_mdo != NULL) {
249 // Update per-method count of trap events. The interpreter
250 // is updating the MDO to simulate the effect of compiler traps.
251 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
252 }
253 }
254 }
255
256 // Assume the compiler is (or will be) interested in this event.
257 // If necessary, create an MDO to hold the information, and record it.
258 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
259 assert(ProfileTraps, "call me only if profiling");
260 methodHandle trap_method(thread, method(thread));
261 int trap_bci = trap_method->bci_from(bcp(thread));
262 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
263 }
264
265 #ifdef CC_INTERP
266 // As legacy note_trap, but we have more arguments.
267 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
268 methodHandle trap_method(method);
269 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
270 IRT_END
271
272 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
273 // for each exception.
274 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
275 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
276 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
277 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
278 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
279 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
280 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
281 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
282 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
283 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
284 #endif // CC_INTERP
285
286
287 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
288 // get klass
289 InstanceKlass* klass = InstanceKlass::cast(k);
290 assert(klass->is_initialized(),
291 "this klass should have been initialized during VM initialization");
292 // create instance - do not call constructor since we may have no
293 // (java) stack space left (should assert constructor is empty)
294 Handle exception;
295 oop exception_oop = klass->allocate_instance(CHECK_(exception));
296 exception = Handle(THREAD, exception_oop);
297 if (StackTraceInThrowable) {
298 java_lang_Throwable::fill_in_stack_trace(exception);
299 }
300 return exception;
301 }
302
303 // Special handling for stack overflow: since we don't have any (java) stack
304 // space left we use the pre-allocated & pre-initialized StackOverflowError
305 // klass to create an stack overflow error instance. We do not call its
306 // constructor for the same reason (it is empty, anyway).
307 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
308 Handle exception = get_preinitialized_exception(
309 SystemDictionary::StackOverflowError_klass(),
310 CHECK);
311 // Increment counter for hs_err file reporting
312 Atomic::inc(&Exceptions::_stack_overflow_errors);
313 THROW_HANDLE(exception);
314 IRT_END
315
316 IRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
317 Handle exception = get_preinitialized_exception(
318 SystemDictionary::StackOverflowError_klass(),
319 CHECK);
320 java_lang_Throwable::set_message(exception(),
321 Universe::delayed_stack_overflow_error_message());
322 // Increment counter for hs_err file reporting
323 Atomic::inc(&Exceptions::_stack_overflow_errors);
324 THROW_HANDLE(exception);
325 IRT_END
326
327 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
328 // lookup exception klass
329 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
330 if (ProfileTraps) {
331 if (s == vmSymbols::java_lang_ArithmeticException()) {
332 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
333 } else if (s == vmSymbols::java_lang_NullPointerException()) {
334 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
335 }
336 }
337 // create exception
338 Handle exception = Exceptions::new_exception(thread, s, message);
339 thread->set_vm_result(exception());
340 IRT_END
341
342
343 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
344 ResourceMark rm(thread);
345 const char* klass_name = obj->klass()->external_name();
346 // lookup exception klass
347 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
348 if (ProfileTraps) {
349 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
350 }
351 // create exception, with klass name as detail message
352 Handle exception = Exceptions::new_exception(thread, s, klass_name);
353 thread->set_vm_result(exception());
354 IRT_END
355
356
357 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
358 char message[jintAsStringSize];
359 // lookup exception klass
360 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
361 if (ProfileTraps) {
362 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
363 }
364 // create exception
365 sprintf(message, "%d", index);
366 THROW_MSG(s, message);
367 IRT_END
368
369 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
370 JavaThread* thread, oopDesc* obj))
371
372 ResourceMark rm(thread);
373 char* message = SharedRuntime::generate_class_cast_message(
374 thread, obj->klass());
375
376 if (ProfileTraps) {
377 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
378 }
379
380 // create exception
381 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
382 IRT_END
383
384 // exception_handler_for_exception(...) returns the continuation address,
385 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
386 // The exception oop is returned to make sure it is preserved over GC (it
387 // is only on the stack if the exception was thrown explicitly via athrow).
388 // During this operation, the expression stack contains the values for the
389 // bci where the exception happened. If the exception was propagated back
390 // from a call, the expression stack contains the values for the bci at the
391 // invoke w/o arguments (i.e., as if one were inside the call).
392 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
393
394 Handle h_exception(thread, exception);
395 methodHandle h_method (thread, method(thread));
396 constantPoolHandle h_constants(thread, h_method->constants());
397 bool should_repeat;
398 int handler_bci;
399 int current_bci = bci(thread);
400
401 if (thread->frames_to_pop_failed_realloc() > 0) {
402 // Allocation of scalar replaced object used in this frame
403 // failed. Unconditionally pop the frame.
404 thread->dec_frames_to_pop_failed_realloc();
405 thread->set_vm_result(h_exception());
406 // If the method is synchronized we already unlocked the monitor
407 // during deoptimization so the interpreter needs to skip it when
408 // the frame is popped.
409 thread->set_do_not_unlock_if_synchronized(true);
410 #ifdef CC_INTERP
411 return (address) -1;
412 #else
413 return Interpreter::remove_activation_entry();
414 #endif
415 }
416
417 // Need to do this check first since when _do_not_unlock_if_synchronized
418 // is set, we don't want to trigger any classloading which may make calls
419 // into java, or surprisingly find a matching exception handler for bci 0
420 // since at this moment the method hasn't been "officially" entered yet.
421 if (thread->do_not_unlock_if_synchronized()) {
422 ResourceMark rm;
423 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
424 thread->set_vm_result(exception);
425 #ifdef CC_INTERP
426 return (address) -1;
427 #else
428 return Interpreter::remove_activation_entry();
429 #endif
430 }
431
432 do {
433 should_repeat = false;
434
435 // assertions
436 #ifdef ASSERT
437 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
438 assert(h_exception->is_oop(), "just checking");
439 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
440 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
441 if (ExitVMOnVerifyError) vm_exit(-1);
442 ShouldNotReachHere();
443 }
444 #endif
445
446 // tracing
447 if (log_is_enabled(Info, exceptions)) {
448 ResourceMark rm(thread);
449 stringStream tempst;
450 tempst.print("interpreter method <%s>\n"
451 " at bci %d for thread " INTPTR_FORMAT,
452 h_method->print_value_string(), current_bci, p2i(thread));
453 Exceptions::log_exception(h_exception, tempst);
454 }
455 // Don't go paging in something which won't be used.
456 // else if (extable->length() == 0) {
457 // // disabled for now - interpreter is not using shortcut yet
458 // // (shortcut is not to call runtime if we have no exception handlers)
459 // // warning("performance bug: should not call runtime if method has no exception handlers");
460 // }
461 // for AbortVMOnException flag
462 Exceptions::debug_check_abort(h_exception);
463
464 // exception handler lookup
465 Klass* klass = h_exception->klass();
466 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
467 if (HAS_PENDING_EXCEPTION) {
468 // We threw an exception while trying to find the exception handler.
469 // Transfer the new exception to the exception handle which will
470 // be set into thread local storage, and do another lookup for an
471 // exception handler for this exception, this time starting at the
472 // BCI of the exception handler which caused the exception to be
473 // thrown (bug 4307310).
474 h_exception = Handle(THREAD, PENDING_EXCEPTION);
475 CLEAR_PENDING_EXCEPTION;
476 if (handler_bci >= 0) {
477 current_bci = handler_bci;
478 should_repeat = true;
479 }
480 }
481 } while (should_repeat == true);
482
483 #if INCLUDE_JVMCI
484 if (EnableJVMCI && h_method->method_data() != NULL) {
485 ResourceMark rm(thread);
486 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);
487 if (pdata != NULL && pdata->is_BitData()) {
488 BitData* bit_data = (BitData*) pdata;
489 bit_data->set_exception_seen();
490 }
491 }
492 #endif
493
494 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
495 // time throw or a stack unwinding throw and accordingly notify the debugger
496 if (JvmtiExport::can_post_on_exceptions()) {
497 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
498 }
499
500 #ifdef CC_INTERP
501 address continuation = (address)(intptr_t) handler_bci;
502 #else
503 address continuation = NULL;
504 #endif
505 address handler_pc = NULL;
506 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
507 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
508 // handler in this method, or (b) after a stack overflow there is not yet
509 // enough stack space available to reprotect the stack.
510 #ifndef CC_INTERP
511 continuation = Interpreter::remove_activation_entry();
512 #endif
513 #if COMPILER2_OR_JVMCI
514 // Count this for compilation purposes
515 h_method->interpreter_throwout_increment(THREAD);
516 #endif
517 } else {
518 // handler in this method => change bci/bcp to handler bci/bcp and continue there
519 handler_pc = h_method->code_base() + handler_bci;
520 #ifndef CC_INTERP
521 set_bcp_and_mdp(handler_pc, thread);
522 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
523 #endif
524 }
525 // notify debugger of an exception catch
526 // (this is good for exceptions caught in native methods as well)
527 if (JvmtiExport::can_post_on_exceptions()) {
528 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
529 }
530
531 thread->set_vm_result(h_exception());
532 return continuation;
533 IRT_END
534
535
536 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
537 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
538 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
539 IRT_END
540
541
542 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
543 THROW(vmSymbols::java_lang_AbstractMethodError());
544 IRT_END
545
546
547 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
548 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
549 IRT_END
550
551
552 //------------------------------------------------------------------------------------------------------------------------
553 // Fields
554 //
555
556 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) {
557 Thread* THREAD = thread;
558 // resolve field
559 fieldDescriptor info;
560 constantPoolHandle pool(thread, method(thread)->constants());
561 methodHandle m(thread, method(thread));
562 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
563 bytecode == Bytecodes::_putstatic);
564 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
565
566 {
567 JvmtiHideSingleStepping jhss(thread);
568 LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
569 m, bytecode, CHECK);
570 } // end JvmtiHideSingleStepping
571
572 // check if link resolution caused cpCache to be updated
573 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
574 if (cp_cache_entry->is_resolved(bytecode)) return;
575
576 // compute auxiliary field attributes
577 TosState state = as_TosState(info.field_type());
578
579 // Resolution of put instructions on final fields is delayed. That is required so that
580 // exceptions are thrown at the correct place (when the instruction is actually invoked).
581 // If we do not resolve an instruction in the current pass, leaving the put_code
582 // set to zero will cause the next put instruction to the same field to reresolve.
583
584 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
585 // to final instance fields with updates originating from a method different than <init>)
586 // is inhibited. A putfield instruction targeting an instance final field must throw
587 // an IllegalAccessError if the instruction is not in an instance
588 // initializer method <init>. If resolution were not inhibited, a putfield
589 // in an initializer method could be resolved in the initializer. Subsequent
590 // putfield instructions to the same field would then use cached information.
591 // As a result, those instructions would not pass through the VM. That is,
592 // checks in resolve_field_access() would not be executed for those instructions
593 // and the required IllegalAccessError would not be thrown.
594 //
595 // Also, we need to delay resolving getstatic and putstatic instructions until the
596 // class is initialized. This is required so that access to the static
597 // field will call the initialization function every time until the class
598 // is completely initialized ala. in 2.17.5 in JVM Specification.
599 InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
600 bool uninitialized_static = is_static && !klass->is_initialized();
601 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
602 info.has_initialized_final_update();
603 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
604
605 Bytecodes::Code get_code = (Bytecodes::Code)0;
606 Bytecodes::Code put_code = (Bytecodes::Code)0;
607 if (!uninitialized_static) {
608 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
609 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
610 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
611 }
612 }
613
614 cp_cache_entry->set_field(
615 get_code,
616 put_code,
617 info.field_holder(),
618 info.index(),
619 info.offset(),
620 state,
621 info.access_flags().is_final(),
622 info.access_flags().is_volatile(),
623 pool->pool_holder()
624 );
625 }
626
627
628 //------------------------------------------------------------------------------------------------------------------------
629 // Synchronization
630 //
631 // The interpreter's synchronization code is factored out so that it can
632 // be shared by method invocation and synchronized blocks.
633 //%note synchronization_3
634
635 //%note monitor_1
636 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
637 #ifdef ASSERT
638 thread->last_frame().interpreter_frame_verify_monitor(elem);
639 #endif
640 if (PrintBiasedLockingStatistics) {
641 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
642 }
643 Handle h_obj(thread, elem->obj());
644 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
645 "must be NULL or an object");
646 if (UseBiasedLocking) {
647 // Retry fast entry if bias is revoked to avoid unnecessary inflation
648 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
649 } else {
650 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
651 }
652 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
653 "must be NULL or an object");
654 #ifdef ASSERT
655 thread->last_frame().interpreter_frame_verify_monitor(elem);
656 #endif
657 IRT_END
658
659
660 //%note monitor_1
661 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
662 #ifdef ASSERT
663 thread->last_frame().interpreter_frame_verify_monitor(elem);
664 #endif
665 Handle h_obj(thread, elem->obj());
666 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
667 "must be NULL or an object");
668 if (elem == NULL || h_obj()->is_unlocked()) {
669 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
670 }
671 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
672 // Free entry. This must be done here, since a pending exception might be installed on
673 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
674 elem->set_obj(NULL);
675 #ifdef ASSERT
676 thread->last_frame().interpreter_frame_verify_monitor(elem);
677 #endif
678 IRT_END
679
680
681 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
682 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
683 IRT_END
684
685
686 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
687 // Returns an illegal exception to install into the current thread. The
688 // pending_exception flag is cleared so normal exception handling does not
689 // trigger. Any current installed exception will be overwritten. This
690 // method will be called during an exception unwind.
691
692 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
693 Handle exception(thread, thread->vm_result());
694 assert(exception() != NULL, "vm result should be set");
695 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
696 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
697 exception = get_preinitialized_exception(
698 SystemDictionary::IllegalMonitorStateException_klass(),
699 CATCH);
700 }
701 thread->set_vm_result(exception());
702 IRT_END
703
704
705 //------------------------------------------------------------------------------------------------------------------------
706 // Invokes
707
708 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
709 return method->orig_bytecode_at(method->bci_from(bcp));
710 IRT_END
711
712 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
713 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
714 IRT_END
715
716 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
717 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
718 IRT_END
719
720 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) {
721 Thread* THREAD = thread;
722 // extract receiver from the outgoing argument list if necessary
723 Handle receiver(thread, NULL);
724 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
725 bytecode == Bytecodes::_invokespecial) {
726 ResourceMark rm(thread);
727 methodHandle m (thread, method(thread));
728 Bytecode_invoke call(m, bci(thread));
729 Symbol* signature = call.signature();
730 receiver = Handle(thread,
731 thread->last_frame().interpreter_callee_receiver(signature));
732 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
733 "sanity check");
734 assert(receiver.is_null() ||
735 !Universe::heap()->is_in_reserved(receiver->klass()),
736 "sanity check");
737 }
738
739 // resolve method
740 CallInfo info;
741 constantPoolHandle pool(thread, method(thread)->constants());
742
743 {
744 JvmtiHideSingleStepping jhss(thread);
745 LinkResolver::resolve_invoke(info, receiver, pool,
746 get_index_u2_cpcache(thread, bytecode), bytecode,
747 CHECK);
748 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
749 int retry_count = 0;
750 while (info.resolved_method()->is_old()) {
751 // It is very unlikely that method is redefined more than 100 times
752 // in the middle of resolve. If it is looping here more than 100 times
753 // means then there could be a bug here.
754 guarantee((retry_count++ < 100),
755 "Could not resolve to latest version of redefined method");
756 // method is redefined in the middle of resolve so re-try.
757 LinkResolver::resolve_invoke(info, receiver, pool,
758 get_index_u2_cpcache(thread, bytecode), bytecode,
759 CHECK);
760 }
761 }
762 } // end JvmtiHideSingleStepping
763
764 // check if link resolution caused cpCache to be updated
765 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
766 if (cp_cache_entry->is_resolved(bytecode)) return;
767
768 #ifdef ASSERT
769 if (bytecode == Bytecodes::_invokeinterface) {
770 if (info.resolved_method()->method_holder() ==
771 SystemDictionary::Object_klass()) {
772 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
773 // (see also CallInfo::set_interface for details)
774 assert(info.call_kind() == CallInfo::vtable_call ||
775 info.call_kind() == CallInfo::direct_call, "");
776 methodHandle rm = info.resolved_method();
777 assert(rm->is_final() || info.has_vtable_index(),
778 "should have been set already");
779 } else if (!info.resolved_method()->has_itable_index()) {
780 // Resolved something like CharSequence.toString. Use vtable not itable.
781 assert(info.call_kind() != CallInfo::itable_call, "");
782 } else {
783 // Setup itable entry
784 assert(info.call_kind() == CallInfo::itable_call, "");
785 int index = info.resolved_method()->itable_index();
786 assert(info.itable_index() == index, "");
787 }
788 } else if (bytecode == Bytecodes::_invokespecial) {
789 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
790 } else {
791 assert(info.call_kind() == CallInfo::direct_call ||
792 info.call_kind() == CallInfo::vtable_call, "");
793 }
794 #endif
795 // Get sender or sender's host_klass, and only set cpCache entry to resolved if
796 // it is not an interface. The receiver for invokespecial calls within interface
797 // methods must be checked for every call.
798 InstanceKlass* sender = pool->pool_holder();
799 sender = sender->is_anonymous() ? sender->host_klass() : sender;
800
801 switch (info.call_kind()) {
802 case CallInfo::direct_call:
803 cp_cache_entry->set_direct_call(
804 bytecode,
805 info.resolved_method(),
806 sender->is_interface());
807 break;
808 case CallInfo::vtable_call:
809 cp_cache_entry->set_vtable_call(
810 bytecode,
811 info.resolved_method(),
812 info.vtable_index());
813 break;
814 case CallInfo::itable_call:
815 cp_cache_entry->set_itable_call(
816 bytecode,
817 info.resolved_method(),
818 info.itable_index());
819 break;
820 default: ShouldNotReachHere();
821 }
822 }
823
824
825 // First time execution: Resolve symbols, create a permanent MethodType object.
826 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) {
827 Thread* THREAD = thread;
828 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
829
830 // resolve method
831 CallInfo info;
832 constantPoolHandle pool(thread, method(thread)->constants());
833 {
834 JvmtiHideSingleStepping jhss(thread);
835 LinkResolver::resolve_invoke(info, Handle(), pool,
836 get_index_u2_cpcache(thread, bytecode), bytecode,
837 CHECK);
838 } // end JvmtiHideSingleStepping
839
840 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
841 cp_cache_entry->set_method_handle(pool, info);
842 }
843
844 // First time execution: Resolve symbols, create a permanent CallSite object.
845 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) {
846 Thread* THREAD = thread;
847 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
848
849 //TO DO: consider passing BCI to Java.
850 // int caller_bci = method(thread)->bci_from(bcp(thread));
851
852 // resolve method
853 CallInfo info;
854 constantPoolHandle pool(thread, method(thread)->constants());
855 int index = get_index_u4(thread, bytecode);
856 {
857 JvmtiHideSingleStepping jhss(thread);
858 LinkResolver::resolve_invoke(info, Handle(), pool,
859 index, bytecode, CHECK);
860 } // end JvmtiHideSingleStepping
861
862 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
863 cp_cache_entry->set_dynamic_call(pool, info);
864 }
865
866 // This function is the interface to the assembly code. It returns the resolved
867 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
868 // This function will check for redefinition!
869 IRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) {
870 switch (bytecode) {
871 case Bytecodes::_getstatic:
872 case Bytecodes::_putstatic:
873 case Bytecodes::_getfield:
874 case Bytecodes::_putfield:
875 resolve_get_put(thread, bytecode);
876 break;
877 case Bytecodes::_invokevirtual:
878 case Bytecodes::_invokespecial:
879 case Bytecodes::_invokestatic:
880 case Bytecodes::_invokeinterface:
881 resolve_invoke(thread, bytecode);
882 break;
883 case Bytecodes::_invokehandle:
884 resolve_invokehandle(thread);
885 break;
886 case Bytecodes::_invokedynamic:
887 resolve_invokedynamic(thread);
888 break;
889 default:
890 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
891 break;
892 }
893 }
894 IRT_END
895
896 //------------------------------------------------------------------------------------------------------------------------
897 // Miscellaneous
898
899
900 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
901 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
902 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
903 if (branch_bcp != NULL && nm != NULL) {
904 // This was a successful request for an OSR nmethod. Because
905 // frequency_counter_overflow_inner ends with a safepoint check,
906 // nm could have been unloaded so look it up again. It's unsafe
907 // to examine nm directly since it might have been freed and used
908 // for something else.
909 frame fr = thread->last_frame();
910 Method* method = fr.interpreter_frame_method();
911 int bci = method->bci_from(fr.interpreter_frame_bcp());
912 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
913 }
914 #ifndef PRODUCT
915 if (TraceOnStackReplacement) {
916 if (nm != NULL) {
917 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
918 nm->print();
919 }
920 }
921 #endif
922 return nm;
923 }
924
925 IRT_ENTRY(nmethod*,
926 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
927 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
928 // flag, in case this method triggers classloading which will call into Java.
929 UnlockFlagSaver fs(thread);
930
931 frame fr = thread->last_frame();
932 assert(fr.is_interpreted_frame(), "must come from interpreter");
933 methodHandle method(thread, fr.interpreter_frame_method());
934 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
935 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
936
937 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
938 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
939 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
940
941 if (osr_nm != NULL) {
942 // We may need to do on-stack replacement which requires that no
943 // monitors in the activation are biased because their
944 // BasicObjectLocks will need to migrate during OSR. Force
945 // unbiasing of all monitors in the activation now (even though
946 // the OSR nmethod might be invalidated) because we don't have a
947 // safepoint opportunity later once the migration begins.
948 if (UseBiasedLocking) {
949 ResourceMark rm;
950 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
951 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
952 kptr < fr.interpreter_frame_monitor_begin();
953 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
954 if( kptr->obj() != NULL ) {
955 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
956 }
957 }
958 BiasedLocking::revoke(objects_to_revoke);
959 }
960 }
961 return osr_nm;
962 IRT_END
963
964 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
965 assert(ProfileInterpreter, "must be profiling interpreter");
966 int bci = method->bci_from(cur_bcp);
967 MethodData* mdo = method->method_data();
968 if (mdo == NULL) return 0;
969 return mdo->bci_to_di(bci);
970 IRT_END
971
972 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
973 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
974 // flag, in case this method triggers classloading which will call into Java.
975 UnlockFlagSaver fs(thread);
976
977 assert(ProfileInterpreter, "must be profiling interpreter");
978 frame fr = thread->last_frame();
979 assert(fr.is_interpreted_frame(), "must come from interpreter");
980 methodHandle method(thread, fr.interpreter_frame_method());
981 Method::build_interpreter_method_data(method, THREAD);
982 if (HAS_PENDING_EXCEPTION) {
983 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
984 CLEAR_PENDING_EXCEPTION;
985 // and fall through...
986 }
987 IRT_END
988
989
990 #ifdef ASSERT
991 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
992 assert(ProfileInterpreter, "must be profiling interpreter");
993
994 MethodData* mdo = method->method_data();
995 assert(mdo != NULL, "must not be null");
996
997 int bci = method->bci_from(bcp);
998
999 address mdp2 = mdo->bci_to_dp(bci);
1000 if (mdp != mdp2) {
1001 ResourceMark rm;
1002 ResetNoHandleMark rnm; // In a LEAF entry.
1003 HandleMark hm;
1004 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1005 int current_di = mdo->dp_to_di(mdp);
1006 int expected_di = mdo->dp_to_di(mdp2);
1007 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1008 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1009 int approx_bci = -1;
1010 if (current_di >= 0) {
1011 approx_bci = mdo->data_at(current_di)->bci();
1012 }
1013 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1014 mdo->print_on(tty);
1015 method->print_codes();
1016 }
1017 assert(mdp == mdp2, "wrong mdp");
1018 IRT_END
1019 #endif // ASSERT
1020
1021 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
1022 assert(ProfileInterpreter, "must be profiling interpreter");
1023 ResourceMark rm(thread);
1024 HandleMark hm(thread);
1025 frame fr = thread->last_frame();
1026 assert(fr.is_interpreted_frame(), "must come from interpreter");
1027 MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
1028
1029 // Grab a lock to ensure atomic access to setting the return bci and
1030 // the displacement. This can block and GC, invalidating all naked oops.
1031 MutexLocker ml(RetData_lock);
1032
1033 // ProfileData is essentially a wrapper around a derived oop, so we
1034 // need to take the lock before making any ProfileData structures.
1035 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
1036 guarantee(data != NULL, "profile data must be valid");
1037 RetData* rdata = data->as_RetData();
1038 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1039 fr.interpreter_frame_set_mdp(new_mdp);
1040 IRT_END
1041
1042 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
1043 MethodCounters* mcs = Method::build_method_counters(m, thread);
1044 if (HAS_PENDING_EXCEPTION) {
1045 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1046 CLEAR_PENDING_EXCEPTION;
1047 }
1048 return mcs;
1049 IRT_END
1050
1051
1052 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
1053 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1054 // stack traversal automatically takes care of preserving arguments for invoke, so
1055 // this is no longer needed.
1056
1057 // IRT_END does an implicit safepoint check, hence we are guaranteed to block
1058 // if this is called during a safepoint
1059
1060 if (JvmtiExport::should_post_single_step()) {
1061 // We are called during regular safepoints and when the VM is
1062 // single stepping. If any thread is marked for single stepping,
1063 // then we may have JVMTI work to do.
1064 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
1065 }
1066 IRT_END
1067
1068 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1069 ConstantPoolCacheEntry *cp_entry))
1070
1071 // check the access_flags for the field in the klass
1072
1073 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1074 int index = cp_entry->field_index();
1075 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1076
1077 bool is_static = (obj == NULL);
1078 HandleMark hm(thread);
1079
1080 Handle h_obj;
1081 if (!is_static) {
1082 // non-static field accessors have an object, but we need a handle
1083 h_obj = Handle(thread, obj);
1084 }
1085 InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1086 jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);
1087 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), cp_entry_f1, h_obj, fid);
1088 IRT_END
1089
1090 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1091 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1092
1093 Klass* k = cp_entry->f1_as_klass();
1094
1095 // check the access_flags for the field in the klass
1096 InstanceKlass* ik = InstanceKlass::cast(k);
1097 int index = cp_entry->field_index();
1098 // bail out if field modifications are not watched
1099 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1100
1101 char sig_type = '\0';
1102
1103 switch(cp_entry->flag_state()) {
1104 case btos: sig_type = 'B'; break;
1105 case ztos: sig_type = 'Z'; break;
1106 case ctos: sig_type = 'C'; break;
1107 case stos: sig_type = 'S'; break;
1108 case itos: sig_type = 'I'; break;
1109 case ftos: sig_type = 'F'; break;
1110 case atos: sig_type = 'L'; break;
1111 case ltos: sig_type = 'J'; break;
1112 case dtos: sig_type = 'D'; break;
1113 default: ShouldNotReachHere(); return;
1114 }
1115 bool is_static = (obj == NULL);
1116
1117 HandleMark hm(thread);
1118 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);
1119 jvalue fvalue;
1120 #ifdef _LP64
1121 fvalue = *value;
1122 #else
1123 // Long/double values are stored unaligned and also noncontiguously with
1124 // tagged stacks. We can't just do a simple assignment even in the non-
1125 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1126 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1127 // We assume that the two halves of longs/doubles are stored in interpreter
1128 // stack slots in platform-endian order.
1129 jlong_accessor u;
1130 jint* newval = (jint*)value;
1131 u.words[0] = newval[0];
1132 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1133 fvalue.j = u.long_value;
1134 #endif // _LP64
1135
1136 Handle h_obj;
1137 if (!is_static) {
1138 // non-static field accessors have an object, but we need a handle
1139 h_obj = Handle(thread, obj);
1140 }
1141
1142 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), ik, h_obj,
1143 fid, sig_type, &fvalue);
1144 IRT_END
1145
1146 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1147 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1148 IRT_END
1149
1150
1151 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1152 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1153 IRT_END
1154
1155 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1156 {
1157 return (Interpreter::contains(pc) ? 1 : 0);
1158 }
1159 IRT_END
1160
1161
1162 // Implementation of SignatureHandlerLibrary
1163
1164 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1165 // Dummy definition (else normalization method is defined in CPU
1166 // dependant code)
1167 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1168 return fingerprint;
1169 }
1170 #endif
1171
1172 address SignatureHandlerLibrary::set_handler_blob() {
1173 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1174 if (handler_blob == NULL) {
1175 return NULL;
1176 }
1177 address handler = handler_blob->code_begin();
1178 _handler_blob = handler_blob;
1179 _handler = handler;
1180 return handler;
1181 }
1182
1183 void SignatureHandlerLibrary::initialize() {
1184 if (_fingerprints != NULL) {
1185 return;
1186 }
1187 if (set_handler_blob() == NULL) {
1188 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1189 }
1190
1191 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1192 SignatureHandlerLibrary::buffer_size);
1193 _buffer = bb->code_begin();
1194
1195 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1196 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1197 }
1198
1199 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1200 address handler = _handler;
1201 int insts_size = buffer->pure_insts_size();
1202 if (handler + insts_size > _handler_blob->code_end()) {
1203 // get a new handler blob
1204 handler = set_handler_blob();
1205 }
1206 if (handler != NULL) {
1207 memcpy(handler, buffer->insts_begin(), insts_size);
1208 pd_set_handler(handler);
1209 ICache::invalidate_range(handler, insts_size);
1210 _handler = handler + insts_size;
1211 }
1212 return handler;
1213 }
1214
1215 void SignatureHandlerLibrary::add(const methodHandle& method) {
1216 if (method->signature_handler() == NULL) {
1217 // use slow signature handler if we can't do better
1218 int handler_index = -1;
1219 // check if we can use customized (fast) signature handler
1220 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1221 // use customized signature handler
1222 MutexLocker mu(SignatureHandlerLibrary_lock);
1223 // make sure data structure is initialized
1224 initialize();
1225 // lookup method signature's fingerprint
1226 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1227 // allow CPU dependant code to optimize the fingerprints for the fast handler
1228 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1229 handler_index = _fingerprints->find(fingerprint);
1230 // create handler if necessary
1231 if (handler_index < 0) {
1232 ResourceMark rm;
1233 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1234 CodeBuffer buffer((address)(_buffer + align_offset),
1235 SignatureHandlerLibrary::buffer_size - align_offset);
1236 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1237 // copy into code heap
1238 address handler = set_handler(&buffer);
1239 if (handler == NULL) {
1240 // use slow signature handler (without memorizing it in the fingerprints)
1241 } else {
1242 // debugging suppport
1243 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1244 ttyLocker ttyl;
1245 tty->cr();
1246 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1247 _handlers->length(),
1248 (method->is_static() ? "static" : "receiver"),
1249 method->name_and_sig_as_C_string(),
1250 fingerprint,
1251 buffer.insts_size());
1252 if (buffer.insts_size() > 0) {
1253 Disassembler::decode(handler, handler + buffer.insts_size());
1254 }
1255 #ifndef PRODUCT
1256 address rh_begin = Interpreter::result_handler(method()->result_type());
1257 if (CodeCache::contains(rh_begin)) {
1258 // else it might be special platform dependent values
1259 tty->print_cr(" --- associated result handler ---");
1260 address rh_end = rh_begin;
1261 while (*(int*)rh_end != 0) {
1262 rh_end += sizeof(int);
1263 }
1264 Disassembler::decode(rh_begin, rh_end);
1265 } else {
1266 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1267 }
1268 #endif
1269 }
1270 // add handler to library
1271 _fingerprints->append(fingerprint);
1272 _handlers->append(handler);
1273 // set handler index
1274 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1275 handler_index = _fingerprints->length() - 1;
1276 }
1277 }
1278 // Set handler under SignatureHandlerLibrary_lock
1279 if (handler_index < 0) {
1280 // use generic signature handler
1281 method->set_signature_handler(Interpreter::slow_signature_handler());
1282 } else {
1283 // set handler
1284 method->set_signature_handler(_handlers->at(handler_index));
1285 }
1286 } else {
1287 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1288 // use generic signature handler
1289 method->set_signature_handler(Interpreter::slow_signature_handler());
1290 }
1291 }
1292 #ifdef ASSERT
1293 int handler_index = -1;
1294 int fingerprint_index = -2;
1295 {
1296 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1297 // in any way if accessed from multiple threads. To avoid races with another
1298 // thread which may change the arrays in the above, mutex protected block, we
1299 // have to protect this read access here with the same mutex as well!
1300 MutexLocker mu(SignatureHandlerLibrary_lock);
1301 if (_handlers != NULL) {
1302 handler_index = _handlers->find(method->signature_handler());
1303 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1304 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1305 fingerprint_index = _fingerprints->find(fingerprint);
1306 }
1307 }
1308 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1309 handler_index == fingerprint_index, "sanity check");
1310 #endif // ASSERT
1311 }
1312
1313 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1314 int handler_index = -1;
1315 // use customized signature handler
1316 MutexLocker mu(SignatureHandlerLibrary_lock);
1317 // make sure data structure is initialized
1318 initialize();
1319 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1320 handler_index = _fingerprints->find(fingerprint);
1321 // create handler if necessary
1322 if (handler_index < 0) {
1323 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1324 tty->cr();
1325 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1326 _handlers->length(),
1327 p2i(handler),
1328 fingerprint);
1329 }
1330 _fingerprints->append(fingerprint);
1331 _handlers->append(handler);
1332 } else {
1333 if (PrintSignatureHandlers) {
1334 tty->cr();
1335 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1336 _handlers->length(),
1337 fingerprint,
1338 p2i(_handlers->at(handler_index)),
1339 p2i(handler));
1340 }
1341 }
1342 }
1343
1344
1345 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1346 address SignatureHandlerLibrary::_handler = NULL;
1347 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1348 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1349 address SignatureHandlerLibrary::_buffer = NULL;
1350
1351
1352 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1353 methodHandle m(thread, method);
1354 assert(m->is_native(), "sanity check");
1355 // lookup native function entry point if it doesn't exist
1356 bool in_base_library;
1357 if (!m->has_native_function()) {
1358 NativeLookup::lookup(m, in_base_library, CHECK);
1359 }
1360 // make sure signature handler is installed
1361 SignatureHandlerLibrary::add(m);
1362 // The interpreter entry point checks the signature handler first,
1363 // before trying to fetch the native entry point and klass mirror.
1364 // We must set the signature handler last, so that multiple processors
1365 // preparing the same method will be sure to see non-null entry & mirror.
1366 IRT_END
1367
1368 #if defined(IA32) || defined(AMD64) || defined(ARM)
1369 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1370 if (src_address == dest_address) {
1371 return;
1372 }
1373 ResetNoHandleMark rnm; // In a LEAF entry.
1374 HandleMark hm;
1375 ResourceMark rm;
1376 frame fr = thread->last_frame();
1377 assert(fr.is_interpreted_frame(), "");
1378 jint bci = fr.interpreter_frame_bci();
1379 methodHandle mh(thread, fr.interpreter_frame_method());
1380 Bytecode_invoke invoke(mh, bci);
1381 ArgumentSizeComputer asc(invoke.signature());
1382 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1383 Copy::conjoint_jbytes(src_address, dest_address,
1384 size_of_arguments * Interpreter::stackElementSize);
1385 IRT_END
1386 #endif
1387
1388 #if INCLUDE_JVMTI
1389 // This is a support of the JVMTI PopFrame interface.
1390 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1391 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1392 // The member_name argument is a saved reference (in local#0) to the member_name.
1393 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1394 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1395 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1396 Method* method, address bcp))
1397 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1398 if (code != Bytecodes::_invokestatic) {
1399 return;
1400 }
1401 ConstantPool* cpool = method->constants();
1402 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1403 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1404 Symbol* mname = cpool->name_ref_at(cp_index);
1405
1406 if (MethodHandles::has_member_arg(cname, mname)) {
1407 oop member_name_oop = (oop) member_name;
1408 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1409 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1410 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1411 }
1412 thread->set_vm_result(member_name_oop);
1413 } else {
1414 thread->set_vm_result(NULL);
1415 }
1416 IRT_END
1417 #endif // INCLUDE_JVMTI
1418
1419 #ifndef PRODUCT
1420 // This must be a IRT_LEAF function because the interpreter must save registers on x86 to
1421 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1422 // The generated code still uses call_VM because that will set up the frame pointer for
1423 // bcp and method.
1424 IRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1425 const frame f = thread->last_frame();
1426 assert(f.is_interpreted_frame(), "must be an interpreted frame");
1427 methodHandle mh(thread, f.interpreter_frame_method());
1428 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
1429 return preserve_this_value;
1430 IRT_END
1431 #endif // !PRODUCT