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