1 /*
2 * Copyright (c) 1997, 2011, 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/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "gc_interface/collectedHeap.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "interpreter/interpreterRuntime.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "interpreter/templateTable.hpp"
34 #include "memory/oopFactory.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/constantPoolOop.hpp"
37 #include "oops/cpCacheOop.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/methodDataOop.hpp"
40 #include "oops/objArrayKlass.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "oops/symbol.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "prims/nativeLookup.hpp"
45 #include "runtime/biasedLocking.hpp"
46 #include "runtime/compilationPolicy.hpp"
47 #include "runtime/deoptimization.hpp"
48 #include "runtime/fieldDescriptor.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/interfaceSupport.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/jfieldIDWorkaround.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/sharedRuntime.hpp"
55 #include "runtime/stubRoutines.hpp"
56 #include "runtime/synchronizer.hpp"
57 #include "runtime/threadCritical.hpp"
58 #include "utilities/events.hpp"
59 #ifdef TARGET_ARCH_x86
60 # include "vm_version_x86.hpp"
61 #endif
62 #ifdef TARGET_ARCH_sparc
63 # include "vm_version_sparc.hpp"
64 #endif
65 #ifdef TARGET_ARCH_zero
66 # include "vm_version_zero.hpp"
67 #endif
68 #ifdef TARGET_ARCH_arm
69 # include "vm_version_arm.hpp"
70 #endif
71 #ifdef TARGET_ARCH_ppc
72 # include "vm_version_ppc.hpp"
73 #endif
74 #ifdef COMPILER2
75 #include "opto/runtime.hpp"
76 #endif
77
78 class UnlockFlagSaver {
79 private:
80 JavaThread* _thread;
81 bool _do_not_unlock;
82 public:
83 UnlockFlagSaver(JavaThread* t) {
84 _thread = t;
85 _do_not_unlock = t->do_not_unlock_if_synchronized();
86 t->set_do_not_unlock_if_synchronized(false);
87 }
88 ~UnlockFlagSaver() {
89 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
90 }
91 };
92
93 //------------------------------------------------------------------------------------------------------------------------
94 // State accessors
95
96 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
97 last_frame(thread).interpreter_frame_set_bcp(bcp);
98 if (ProfileInterpreter) {
99 // ProfileTraps uses MDOs independently of ProfileInterpreter.
100 // That is why we must check both ProfileInterpreter and mdo != NULL.
101 methodDataOop mdo = last_frame(thread).interpreter_frame_method()->method_data();
102 if (mdo != NULL) {
103 NEEDS_CLEANUP;
104 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
105 }
106 }
107 }
108
109 //------------------------------------------------------------------------------------------------------------------------
110 // Constants
111
112
113 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
114 // access constant pool
115 constantPoolOop pool = method(thread)->constants();
116 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
117 constantTag tag = pool->tag_at(index);
118
119 if (tag.is_unresolved_klass() || tag.is_klass()) {
120 klassOop klass = pool->klass_at(index, CHECK);
121 oop java_class = klass->java_mirror();
122 thread->set_vm_result(java_class);
123 } else {
124 #ifdef ASSERT
125 // If we entered this runtime routine, we believed the tag contained
126 // an unresolved string, an unresolved class or a resolved class.
127 // However, another thread could have resolved the unresolved string
128 // or class by the time we go there.
129 assert(tag.is_unresolved_string()|| tag.is_string(), "expected string");
130 #endif
131 oop s_oop = pool->string_at(index, CHECK);
132 thread->set_vm_result(s_oop);
133 }
134 IRT_END
135
136 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
137 assert(bytecode == Bytecodes::_fast_aldc ||
138 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
139 ResourceMark rm(thread);
140 methodHandle m (thread, method(thread));
141 Bytecode_loadconstant ldc(m, bci(thread));
142 oop result = ldc.resolve_constant(CHECK);
143 #ifdef ASSERT
144 {
145 // The bytecode wrappers aren't GC-safe so construct a new one
146 Bytecode_loadconstant ldc2(m, bci(thread));
147 ConstantPoolCacheEntry* cpce = m->constants()->cache()->entry_at(ldc2.cache_index());
148 assert(result == cpce->f1(), "expected result for assembly code");
149 }
150 #endif
151 }
152 IRT_END
153
154
155 //------------------------------------------------------------------------------------------------------------------------
156 // Allocation
157
158 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, constantPoolOopDesc* pool, int index))
159 klassOop k_oop = pool->klass_at(index, CHECK);
160 instanceKlassHandle klass (THREAD, k_oop);
161
162 // Make sure we are not instantiating an abstract klass
163 klass->check_valid_for_instantiation(true, CHECK);
164
165 // Make sure klass is initialized
166 klass->initialize(CHECK);
167
168 // At this point the class may not be fully initialized
169 // because of recursive initialization. If it is fully
170 // initialized & has_finalized is not set, we rewrite
171 // it into its fast version (Note: no locking is needed
172 // here since this is an atomic byte write and can be
173 // done more than once).
174 //
175 // Note: In case of classes with has_finalized we don't
176 // rewrite since that saves us an extra check in
177 // the fast version which then would call the
178 // slow version anyway (and do a call back into
179 // Java).
180 // If we have a breakpoint, then we don't rewrite
181 // because the _breakpoint bytecode would be lost.
182 oop obj = klass->allocate_instance(CHECK);
183 thread->set_vm_result(obj);
184 IRT_END
185
186
187 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
188 oop obj = oopFactory::new_typeArray(type, size, CHECK);
189 thread->set_vm_result(obj);
190 IRT_END
191
192
193 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, constantPoolOopDesc* pool, int index, jint size))
194 // Note: no oopHandle for pool & klass needed since they are not used
195 // anymore after new_objArray() and no GC can happen before.
196 // (This may have to change if this code changes!)
197 klassOop klass = pool->klass_at(index, CHECK);
198 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
199 thread->set_vm_result(obj);
200 IRT_END
201
202
203 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
204 // We may want to pass in more arguments - could make this slightly faster
205 constantPoolOop constants = method(thread)->constants();
206 int i = get_index_u2(thread, Bytecodes::_multianewarray);
207 klassOop klass = constants->klass_at(i, CHECK);
208 int nof_dims = number_of_dimensions(thread);
209 assert(oop(klass)->is_klass(), "not a class");
210 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
211
212 // We must create an array of jints to pass to multi_allocate.
213 ResourceMark rm(thread);
214 const int small_dims = 10;
215 jint dim_array[small_dims];
216 jint *dims = &dim_array[0];
217 if (nof_dims > small_dims) {
218 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
219 }
220 for (int index = 0; index < nof_dims; index++) {
221 // offset from first_size_address is addressed as local[index]
222 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
223 dims[index] = first_size_address[n];
224 }
225 oop obj = arrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
226 thread->set_vm_result(obj);
227 IRT_END
228
229
230 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
231 assert(obj->is_oop(), "must be a valid oop");
232 assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise");
233 instanceKlass::register_finalizer(instanceOop(obj), CHECK);
234 IRT_END
235
236
237 // Quicken instance-of and check-cast bytecodes
238 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
239 // Force resolving; quicken the bytecode
240 int which = get_index_u2(thread, Bytecodes::_checkcast);
241 constantPoolOop cpool = method(thread)->constants();
242 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
243 // program we might have seen an unquick'd bytecode in the interpreter but have another
244 // thread quicken the bytecode before we get here.
245 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
246 klassOop klass = cpool->klass_at(which, CHECK);
247 thread->set_vm_result(klass);
248 IRT_END
249
250
251 //------------------------------------------------------------------------------------------------------------------------
252 // Exceptions
253
254 // Assume the compiler is (or will be) interested in this event.
255 // If necessary, create an MDO to hold the information, and record it.
256 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
257 assert(ProfileTraps, "call me only if profiling");
258 methodHandle trap_method(thread, method(thread));
259
260 if (trap_method.not_null()) {
261 methodDataHandle trap_mdo(thread, trap_method->method_data());
262 if (trap_mdo.is_null()) {
263 methodOopDesc::build_interpreter_method_data(trap_method, THREAD);
264 if (HAS_PENDING_EXCEPTION) {
265 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
266 CLEAR_PENDING_EXCEPTION;
267 }
268 trap_mdo = methodDataHandle(thread, trap_method->method_data());
269 // and fall through...
270 }
271 if (trap_mdo.not_null()) {
272 // Update per-method count of trap events. The interpreter
273 // is updating the MDO to simulate the effect of compiler traps.
274 int trap_bci = trap_method->bci_from(bcp(thread));
275 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
276 }
277 }
278 }
279
280 static Handle get_preinitialized_exception(klassOop k, TRAPS) {
281 // get klass
282 instanceKlass* klass = instanceKlass::cast(k);
283 assert(klass->is_initialized(),
284 "this klass should have been initialized during VM initialization");
285 // create instance - do not call constructor since we may have no
286 // (java) stack space left (should assert constructor is empty)
287 Handle exception;
288 oop exception_oop = klass->allocate_instance(CHECK_(exception));
289 exception = Handle(THREAD, exception_oop);
290 if (StackTraceInThrowable) {
291 java_lang_Throwable::fill_in_stack_trace(exception);
292 }
293 return exception;
294 }
295
296 // Special handling for stack overflow: since we don't have any (java) stack
297 // space left we use the pre-allocated & pre-initialized StackOverflowError
298 // klass to create an stack overflow error instance. We do not call its
299 // constructor for the same reason (it is empty, anyway).
300 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
301 Handle exception = get_preinitialized_exception(
302 SystemDictionary::StackOverflowError_klass(),
303 CHECK);
304 THROW_HANDLE(exception);
305 IRT_END
306
307
308 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
309 // lookup exception klass
310 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
311 if (ProfileTraps) {
312 if (s == vmSymbols::java_lang_ArithmeticException()) {
313 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
314 } else if (s == vmSymbols::java_lang_NullPointerException()) {
315 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
316 }
317 }
318 // create exception
319 Handle exception = Exceptions::new_exception(thread, s, message);
320 thread->set_vm_result(exception());
321 IRT_END
322
323
324 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
325 ResourceMark rm(thread);
326 const char* klass_name = Klass::cast(obj->klass())->external_name();
327 // lookup exception klass
328 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
329 if (ProfileTraps) {
330 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
331 }
332 // create exception, with klass name as detail message
333 Handle exception = Exceptions::new_exception(thread, s, klass_name);
334 thread->set_vm_result(exception());
335 IRT_END
336
337
338 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
339 char message[jintAsStringSize];
340 // lookup exception klass
341 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
342 if (ProfileTraps) {
343 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
344 }
345 // create exception
346 sprintf(message, "%d", index);
347 THROW_MSG(s, message);
348 IRT_END
349
350 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
351 JavaThread* thread, oopDesc* obj))
352
353 ResourceMark rm(thread);
354 char* message = SharedRuntime::generate_class_cast_message(
355 thread, Klass::cast(obj->klass())->external_name());
356
357 if (ProfileTraps) {
358 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
359 }
360
361 // create exception
362 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
363 IRT_END
364
365 // required can be either a MethodType, or a Class (for a single argument)
366 // actual (if not null) can be either a MethodHandle, or an arbitrary value (for a single argument)
367 IRT_ENTRY(void, InterpreterRuntime::throw_WrongMethodTypeException(JavaThread* thread,
368 oopDesc* required,
369 oopDesc* actual)) {
370 ResourceMark rm(thread);
371 char* message = SharedRuntime::generate_wrong_method_type_message(thread, required, actual);
372
373 if (ProfileTraps) {
374 note_trap(thread, Deoptimization::Reason_constraint, CHECK);
375 }
376
377 // create exception
378 THROW_MSG(vmSymbols::java_lang_invoke_WrongMethodTypeException(), message);
379 }
380 IRT_END
381
382
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 typeArrayHandle h_extable (thread, h_method->exception_table());
398 bool should_repeat;
399 int handler_bci;
400 int current_bci = bci(thread);
401
402 // Need to do this check first since when _do_not_unlock_if_synchronized
403 // is set, we don't want to trigger any classloading which may make calls
404 // into java, or surprisingly find a matching exception handler for bci 0
405 // since at this moment the method hasn't been "officially" entered yet.
406 if (thread->do_not_unlock_if_synchronized()) {
407 ResourceMark rm;
408 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
409 thread->set_vm_result(exception);
410 #ifdef CC_INTERP
411 return (address) -1;
412 #else
413 return Interpreter::remove_activation_entry();
414 #endif
415 }
416
417 do {
418 should_repeat = false;
419
420 // assertions
421 #ifdef ASSERT
422 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
423 assert(h_exception->is_oop(), "just checking");
424 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
425 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
426 if (ExitVMOnVerifyError) vm_exit(-1);
427 ShouldNotReachHere();
428 }
429 #endif
430
431 // tracing
432 if (TraceExceptions) {
433 ttyLocker ttyl;
434 ResourceMark rm(thread);
435 tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());
436 tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
437 tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
438 }
439 // Don't go paging in something which won't be used.
440 // else if (h_extable->length() == 0) {
441 // // disabled for now - interpreter is not using shortcut yet
442 // // (shortcut is not to call runtime if we have no exception handlers)
443 // // warning("performance bug: should not call runtime if method has no exception handlers");
444 // }
445 // for AbortVMOnException flag
446 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
447
448 // exception handler lookup
449 KlassHandle h_klass(THREAD, h_exception->klass());
450 handler_bci = h_method->fast_exception_handler_bci_for(h_klass, current_bci, THREAD);
451 if (HAS_PENDING_EXCEPTION) {
452 // We threw an exception while trying to find the exception handler.
453 // Transfer the new exception to the exception handle which will
454 // be set into thread local storage, and do another lookup for an
455 // exception handler for this exception, this time starting at the
456 // BCI of the exception handler which caused the exception to be
457 // thrown (bug 4307310).
458 h_exception = Handle(THREAD, PENDING_EXCEPTION);
459 CLEAR_PENDING_EXCEPTION;
460 if (handler_bci >= 0) {
461 current_bci = handler_bci;
462 should_repeat = true;
463 }
464 }
465 } while (should_repeat == true);
466
467 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
468 // time throw or a stack unwinding throw and accordingly notify the debugger
469 if (JvmtiExport::can_post_on_exceptions()) {
470 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
471 }
472
473 #ifdef CC_INTERP
474 address continuation = (address)(intptr_t) handler_bci;
475 #else
476 address continuation = NULL;
477 #endif
478 address handler_pc = NULL;
479 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
480 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
481 // handler in this method, or (b) after a stack overflow there is not yet
482 // enough stack space available to reprotect the stack.
483 #ifndef CC_INTERP
484 continuation = Interpreter::remove_activation_entry();
485 #endif
486 // Count this for compilation purposes
487 h_method->interpreter_throwout_increment();
488 } else {
489 // handler in this method => change bci/bcp to handler bci/bcp and continue there
490 handler_pc = h_method->code_base() + handler_bci;
491 #ifndef CC_INTERP
492 set_bcp_and_mdp(handler_pc, thread);
493 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
494 #endif
495 }
496 // notify debugger of an exception catch
497 // (this is good for exceptions caught in native methods as well)
498 if (JvmtiExport::can_post_on_exceptions()) {
499 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
500 }
501
502 thread->set_vm_result(h_exception());
503 return continuation;
504 IRT_END
505
506
507 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
508 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
509 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
510 IRT_END
511
512
513 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
514 THROW(vmSymbols::java_lang_AbstractMethodError());
515 IRT_END
516
517
518 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
519 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
520 IRT_END
521
522
523 //------------------------------------------------------------------------------------------------------------------------
524 // Fields
525 //
526
527 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
528 // resolve field
529 FieldAccessInfo info;
530 constantPoolHandle pool(thread, method(thread)->constants());
531 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
532
533 {
534 JvmtiHideSingleStepping jhss(thread);
535 LinkResolver::resolve_field(info, pool, get_index_u2_cpcache(thread, bytecode),
536 bytecode, false, CHECK);
537 } // end JvmtiHideSingleStepping
538
539 // check if link resolution caused cpCache to be updated
540 if (already_resolved(thread)) return;
541
542 // compute auxiliary field attributes
543 TosState state = as_TosState(info.field_type());
544
545 // We need to delay resolving put instructions on final fields
546 // until we actually invoke one. This is required so we throw
547 // exceptions at the correct place. If we do not resolve completely
548 // in the current pass, leaving the put_code set to zero will
549 // cause the next put instruction to reresolve.
550 bool is_put = (bytecode == Bytecodes::_putfield ||
551 bytecode == Bytecodes::_putstatic);
552 Bytecodes::Code put_code = (Bytecodes::Code)0;
553
554 // We also need to delay resolving getstatic instructions until the
555 // class is intitialized. This is required so that access to the static
556 // field will call the initialization function every time until the class
557 // is completely initialized ala. in 2.17.5 in JVM Specification.
558 instanceKlass *klass = instanceKlass::cast(info.klass()->as_klassOop());
559 bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
560 !klass->is_initialized());
561 Bytecodes::Code get_code = (Bytecodes::Code)0;
562
563
564 if (!uninitialized_static) {
565 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
566 if (is_put || !info.access_flags().is_final()) {
567 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
568 }
569 }
570
571 cache_entry(thread)->set_field(
572 get_code,
573 put_code,
574 info.klass(),
575 info.field_index(),
576 info.field_offset(),
577 state,
578 info.access_flags().is_final(),
579 info.access_flags().is_volatile()
580 );
581 IRT_END
582
583
584 //------------------------------------------------------------------------------------------------------------------------
585 // Synchronization
586 //
587 // The interpreter's synchronization code is factored out so that it can
588 // be shared by method invocation and synchronized blocks.
589 //%note synchronization_3
590
591 static void trace_locking(Handle& h_locking_obj, bool is_locking) {
592 ObjectSynchronizer::trace_locking(h_locking_obj, false, true, is_locking);
593 }
594
595
596 //%note monitor_1
597 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
598 #ifdef ASSERT
599 thread->last_frame().interpreter_frame_verify_monitor(elem);
600 #endif
601 if (PrintBiasedLockingStatistics) {
602 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
603 }
604 Handle h_obj(thread, elem->obj());
605 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
606 "must be NULL or an object");
607 if (UseBiasedLocking) {
608 // Retry fast entry if bias is revoked to avoid unnecessary inflation
609 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
610 } else {
611 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
612 }
613 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
614 "must be NULL or an object");
615 #ifdef ASSERT
616 thread->last_frame().interpreter_frame_verify_monitor(elem);
617 #endif
618 IRT_END
619
620
621 //%note monitor_1
622 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
623 #ifdef ASSERT
624 thread->last_frame().interpreter_frame_verify_monitor(elem);
625 #endif
626 Handle h_obj(thread, elem->obj());
627 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
628 "must be NULL or an object");
629 if (elem == NULL || h_obj()->is_unlocked()) {
630 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
631 }
632 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
633 // Free entry. This must be done here, since a pending exception might be installed on
634 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
635 elem->set_obj(NULL);
636 #ifdef ASSERT
637 thread->last_frame().interpreter_frame_verify_monitor(elem);
638 #endif
639 IRT_END
640
641
642 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
643 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
644 IRT_END
645
646
647 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
648 // Returns an illegal exception to install into the current thread. The
649 // pending_exception flag is cleared so normal exception handling does not
650 // trigger. Any current installed exception will be overwritten. This
651 // method will be called during an exception unwind.
652
653 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
654 Handle exception(thread, thread->vm_result());
655 assert(exception() != NULL, "vm result should be set");
656 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
657 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
658 exception = get_preinitialized_exception(
659 SystemDictionary::IllegalMonitorStateException_klass(),
660 CATCH);
661 }
662 thread->set_vm_result(exception());
663 IRT_END
664
665
666 //------------------------------------------------------------------------------------------------------------------------
667 // Invokes
668
669 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp))
670 return method->orig_bytecode_at(method->bci_from(bcp));
671 IRT_END
672
673 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp, Bytecodes::Code new_code))
674 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
675 IRT_END
676
677 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, methodOopDesc* method, address bcp))
678 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
679 IRT_END
680
681 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode))
682 // extract receiver from the outgoing argument list if necessary
683 Handle receiver(thread, NULL);
684 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
685 ResourceMark rm(thread);
686 methodHandle m (thread, method(thread));
687 Bytecode_invoke call(m, bci(thread));
688 Symbol* signature = call.signature();
689 receiver = Handle(thread,
690 thread->last_frame().interpreter_callee_receiver(signature));
691 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
692 "sanity check");
693 assert(receiver.is_null() ||
694 Universe::heap()->is_in_reserved(receiver->klass()),
695 "sanity check");
696 }
697
698 // resolve method
699 CallInfo info;
700 constantPoolHandle pool(thread, method(thread)->constants());
701
702 {
703 JvmtiHideSingleStepping jhss(thread);
704 LinkResolver::resolve_invoke(info, receiver, pool,
705 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
706 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
707 int retry_count = 0;
708 while (info.resolved_method()->is_old()) {
709 // It is very unlikely that method is redefined more than 100 times
710 // in the middle of resolve. If it is looping here more than 100 times
711 // means then there could be a bug here.
712 guarantee((retry_count++ < 100),
713 "Could not resolve to latest version of redefined method");
714 // method is redefined in the middle of resolve so re-try.
715 LinkResolver::resolve_invoke(info, receiver, pool,
716 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
717 }
718 }
719 } // end JvmtiHideSingleStepping
720
721 // check if link resolution caused cpCache to be updated
722 if (already_resolved(thread)) return;
723
724 if (bytecode == Bytecodes::_invokeinterface) {
725
726 if (TraceItables && Verbose) {
727 ResourceMark rm(thread);
728 tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
729 }
730 if (info.resolved_method()->method_holder() ==
731 SystemDictionary::Object_klass()) {
732 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
733 // (see also cpCacheOop.cpp for details)
734 methodHandle rm = info.resolved_method();
735 assert(rm->is_final() || info.has_vtable_index(),
736 "should have been set already");
737 cache_entry(thread)->set_method(bytecode, rm, info.vtable_index());
738 } else {
739 // Setup itable entry
740 int index = klassItable::compute_itable_index(info.resolved_method()());
741 cache_entry(thread)->set_interface_call(info.resolved_method(), index);
742 }
743 } else {
744 cache_entry(thread)->set_method(
745 bytecode,
746 info.resolved_method(),
747 info.vtable_index());
748 }
749 IRT_END
750
751
752 // First time execution: Resolve symbols, create a permanent CallSite object.
753 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
754 ResourceMark rm(thread);
755
756 assert(EnableInvokeDynamic, "");
757
758 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
759
760 methodHandle caller_method(thread, method(thread));
761
762 constantPoolHandle pool(thread, caller_method->constants());
763 pool->set_invokedynamic(); // mark header to flag active call sites
764
765 int caller_bci = 0;
766 int site_index = 0;
767 { address caller_bcp = bcp(thread);
768 caller_bci = caller_method->bci_from(caller_bcp);
769 site_index = Bytes::get_native_u4(caller_bcp+1);
770 }
771 assert(site_index == InterpreterRuntime::bytecode(thread).get_index_u4(bytecode), "");
772 assert(constantPoolCacheOopDesc::is_secondary_index(site_index), "proper format");
773 // there is a second CPC entries that is of interest; it caches signature info:
774 int main_index = pool->cache()->secondary_entry_at(site_index)->main_entry_index();
775 int pool_index = pool->cache()->entry_at(main_index)->constant_pool_index();
776
777 // first resolve the signature to a MH.invoke methodOop
778 if (!pool->cache()->entry_at(main_index)->is_resolved(bytecode)) {
779 JvmtiHideSingleStepping jhss(thread);
780 CallInfo callinfo;
781 LinkResolver::resolve_invoke(callinfo, Handle(), pool,
782 site_index, bytecode, CHECK);
783 // The main entry corresponds to a JVM_CONSTANT_InvokeDynamic, and serves
784 // as a common reference point for all invokedynamic call sites with
785 // that exact call descriptor. We will link it in the CP cache exactly
786 // as if it were an invokevirtual of MethodHandle.invoke.
787 pool->cache()->entry_at(main_index)->set_method(
788 bytecode,
789 callinfo.resolved_method(),
790 callinfo.vtable_index());
791 }
792
793 // The method (f2 entry) of the main entry is the MH.invoke for the
794 // invokedynamic target call signature.
795 oop f1_value = pool->cache()->entry_at(main_index)->f1();
796 methodHandle signature_invoker(THREAD, (methodOop) f1_value);
797 assert(signature_invoker.not_null() && signature_invoker->is_method() && signature_invoker->is_method_handle_invoke(),
798 "correct result from LinkResolver::resolve_invokedynamic");
799
800 Handle info; // optional argument(s) in JVM_CONSTANT_InvokeDynamic
801 Handle bootm = SystemDictionary::find_bootstrap_method(caller_method, caller_bci,
802 main_index, info, CHECK);
803 if (!java_lang_invoke_MethodHandle::is_instance(bootm())) {
804 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
805 "no bootstrap method found for invokedynamic");
806 }
807
808 // Short circuit if CallSite has been bound already:
809 if (!pool->cache()->secondary_entry_at(site_index)->is_f1_null())
810 return;
811
812 Symbol* call_site_name = pool->name_ref_at(site_index);
813
814 Handle call_site
815 = SystemDictionary::make_dynamic_call_site(bootm,
816 // Callee information:
817 call_site_name,
818 signature_invoker,
819 info,
820 // Caller information:
821 caller_method,
822 caller_bci,
823 CHECK);
824
825 // In the secondary entry, the f1 field is the call site, and the f2 (index)
826 // field is some data about the invoke site. Currently, it is just the BCI.
827 // Later, it might be changed to help manage inlining dependencies.
828 pool->cache()->secondary_entry_at(site_index)->set_dynamic_call(call_site, signature_invoker);
829 }
830 IRT_END
831
832
833 //------------------------------------------------------------------------------------------------------------------------
834 // Miscellaneous
835
836
837 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
838 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
839 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
840 if (branch_bcp != NULL && nm != NULL) {
841 // This was a successful request for an OSR nmethod. Because
842 // frequency_counter_overflow_inner ends with a safepoint check,
843 // nm could have been unloaded so look it up again. It's unsafe
844 // to examine nm directly since it might have been freed and used
845 // for something else.
846 frame fr = thread->last_frame();
847 methodOop method = fr.interpreter_frame_method();
848 int bci = method->bci_from(fr.interpreter_frame_bcp());
849 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
850 }
851 return nm;
852 }
853
854 IRT_ENTRY(nmethod*,
855 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
856 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
857 // flag, in case this method triggers classloading which will call into Java.
858 UnlockFlagSaver fs(thread);
859
860 frame fr = thread->last_frame();
861 assert(fr.is_interpreted_frame(), "must come from interpreter");
862 methodHandle method(thread, fr.interpreter_frame_method());
863 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
864 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
865
866 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, thread);
867
868 if (osr_nm != NULL) {
869 // We may need to do on-stack replacement which requires that no
870 // monitors in the activation are biased because their
871 // BasicObjectLocks will need to migrate during OSR. Force
872 // unbiasing of all monitors in the activation now (even though
873 // the OSR nmethod might be invalidated) because we don't have a
874 // safepoint opportunity later once the migration begins.
875 if (UseBiasedLocking) {
876 ResourceMark rm;
877 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
878 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
879 kptr < fr.interpreter_frame_monitor_begin();
880 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
881 if( kptr->obj() != NULL ) {
882 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
883 }
884 }
885 BiasedLocking::revoke(objects_to_revoke);
886 }
887 }
888 return osr_nm;
889 IRT_END
890
891 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(methodOopDesc* method, address cur_bcp))
892 assert(ProfileInterpreter, "must be profiling interpreter");
893 int bci = method->bci_from(cur_bcp);
894 methodDataOop mdo = method->method_data();
895 if (mdo == NULL) return 0;
896 return mdo->bci_to_di(bci);
897 IRT_END
898
899 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
900 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
901 // flag, in case this method triggers classloading which will call into Java.
902 UnlockFlagSaver fs(thread);
903
904 assert(ProfileInterpreter, "must be profiling interpreter");
905 frame fr = thread->last_frame();
906 assert(fr.is_interpreted_frame(), "must come from interpreter");
907 methodHandle method(thread, fr.interpreter_frame_method());
908 methodOopDesc::build_interpreter_method_data(method, THREAD);
909 if (HAS_PENDING_EXCEPTION) {
910 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
911 CLEAR_PENDING_EXCEPTION;
912 // and fall through...
913 }
914 IRT_END
915
916
917 #ifdef ASSERT
918 IRT_LEAF(void, InterpreterRuntime::verify_mdp(methodOopDesc* method, address bcp, address mdp))
919 assert(ProfileInterpreter, "must be profiling interpreter");
920
921 methodDataOop mdo = method->method_data();
922 assert(mdo != NULL, "must not be null");
923
924 int bci = method->bci_from(bcp);
925
926 address mdp2 = mdo->bci_to_dp(bci);
927 if (mdp != mdp2) {
928 ResourceMark rm;
929 ResetNoHandleMark rnm; // In a LEAF entry.
930 HandleMark hm;
931 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
932 int current_di = mdo->dp_to_di(mdp);
933 int expected_di = mdo->dp_to_di(mdp2);
934 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
935 int expected_approx_bci = mdo->data_at(expected_di)->bci();
936 int approx_bci = -1;
937 if (current_di >= 0) {
938 approx_bci = mdo->data_at(current_di)->bci();
939 }
940 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
941 mdo->print_on(tty);
942 method->print_codes();
943 }
944 assert(mdp == mdp2, "wrong mdp");
945 IRT_END
946 #endif // ASSERT
947
948 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
949 assert(ProfileInterpreter, "must be profiling interpreter");
950 ResourceMark rm(thread);
951 HandleMark hm(thread);
952 frame fr = thread->last_frame();
953 assert(fr.is_interpreted_frame(), "must come from interpreter");
954 methodDataHandle h_mdo(thread, fr.interpreter_frame_method()->method_data());
955
956 // Grab a lock to ensure atomic access to setting the return bci and
957 // the displacement. This can block and GC, invalidating all naked oops.
958 MutexLocker ml(RetData_lock);
959
960 // ProfileData is essentially a wrapper around a derived oop, so we
961 // need to take the lock before making any ProfileData structures.
962 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
963 RetData* rdata = data->as_RetData();
964 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
965 fr.interpreter_frame_set_mdp(new_mdp);
966 IRT_END
967
968
969 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
970 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
971 // stack traversal automatically takes care of preserving arguments for invoke, so
972 // this is no longer needed.
973
974 // IRT_END does an implicit safepoint check, hence we are guaranteed to block
975 // if this is called during a safepoint
976
977 if (JvmtiExport::should_post_single_step()) {
978 // We are called during regular safepoints and when the VM is
979 // single stepping. If any thread is marked for single stepping,
980 // then we may have JVMTI work to do.
981 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
982 }
983 IRT_END
984
985 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
986 ConstantPoolCacheEntry *cp_entry))
987
988 // check the access_flags for the field in the klass
989
990 instanceKlass* ik = instanceKlass::cast(java_lang_Class::as_klassOop(cp_entry->f1()));
991 typeArrayOop fields = ik->fields();
992 int index = cp_entry->field_index();
993 assert(index < fields->length(), "holders field index is out of range");
994 // bail out if field accesses are not watched
995 if ((fields->ushort_at(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
996
997 switch(cp_entry->flag_state()) {
998 case btos: // fall through
999 case ctos: // fall through
1000 case stos: // fall through
1001 case itos: // fall through
1002 case ftos: // fall through
1003 case ltos: // fall through
1004 case dtos: // fall through
1005 case atos: break;
1006 default: ShouldNotReachHere(); return;
1007 }
1008 bool is_static = (obj == NULL);
1009 HandleMark hm(thread);
1010
1011 Handle h_obj;
1012 if (!is_static) {
1013 // non-static field accessors have an object, but we need a handle
1014 h_obj = Handle(thread, obj);
1015 }
1016 instanceKlassHandle h_cp_entry_f1(thread, java_lang_Class::as_klassOop(cp_entry->f1()));
1017 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2(), is_static);
1018 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
1019 IRT_END
1020
1021 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1022 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1023
1024 klassOop k = java_lang_Class::as_klassOop(cp_entry->f1());
1025
1026 // check the access_flags for the field in the klass
1027 instanceKlass* ik = instanceKlass::cast(k);
1028 typeArrayOop fields = ik->fields();
1029 int index = cp_entry->field_index();
1030 assert(index < fields->length(), "holders field index is out of range");
1031 // bail out if field modifications are not watched
1032 if ((fields->ushort_at(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1033
1034 char sig_type = '\0';
1035
1036 switch(cp_entry->flag_state()) {
1037 case btos: sig_type = 'Z'; break;
1038 case ctos: sig_type = 'C'; break;
1039 case stos: sig_type = 'S'; break;
1040 case itos: sig_type = 'I'; break;
1041 case ftos: sig_type = 'F'; break;
1042 case atos: sig_type = 'L'; break;
1043 case ltos: sig_type = 'J'; break;
1044 case dtos: sig_type = 'D'; break;
1045 default: ShouldNotReachHere(); return;
1046 }
1047 bool is_static = (obj == NULL);
1048
1049 HandleMark hm(thread);
1050 instanceKlassHandle h_klass(thread, k);
1051 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2(), is_static);
1052 jvalue fvalue;
1053 #ifdef _LP64
1054 fvalue = *value;
1055 #else
1056 // Long/double values are stored unaligned and also noncontiguously with
1057 // tagged stacks. We can't just do a simple assignment even in the non-
1058 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1059 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1060 // We assume that the two halves of longs/doubles are stored in interpreter
1061 // stack slots in platform-endian order.
1062 jlong_accessor u;
1063 jint* newval = (jint*)value;
1064 u.words[0] = newval[0];
1065 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1066 fvalue.j = u.long_value;
1067 #endif // _LP64
1068
1069 Handle h_obj;
1070 if (!is_static) {
1071 // non-static field accessors have an object, but we need a handle
1072 h_obj = Handle(thread, obj);
1073 }
1074
1075 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1076 fid, sig_type, &fvalue);
1077 IRT_END
1078
1079 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1080 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1081 IRT_END
1082
1083
1084 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1085 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1086 IRT_END
1087
1088 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1089 {
1090 return (Interpreter::contains(pc) ? 1 : 0);
1091 }
1092 IRT_END
1093
1094
1095 // Implementation of SignatureHandlerLibrary
1096
1097 address SignatureHandlerLibrary::set_handler_blob() {
1098 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1099 if (handler_blob == NULL) {
1100 return NULL;
1101 }
1102 address handler = handler_blob->code_begin();
1103 _handler_blob = handler_blob;
1104 _handler = handler;
1105 return handler;
1106 }
1107
1108 void SignatureHandlerLibrary::initialize() {
1109 if (_fingerprints != NULL) {
1110 return;
1111 }
1112 if (set_handler_blob() == NULL) {
1113 vm_exit_out_of_memory(blob_size, "native signature handlers");
1114 }
1115
1116 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1117 SignatureHandlerLibrary::buffer_size);
1118 _buffer = bb->code_begin();
1119
1120 _fingerprints = new(ResourceObj::C_HEAP)GrowableArray<uint64_t>(32, true);
1121 _handlers = new(ResourceObj::C_HEAP)GrowableArray<address>(32, true);
1122 }
1123
1124 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1125 address handler = _handler;
1126 int insts_size = buffer->pure_insts_size();
1127 if (handler + insts_size > _handler_blob->code_end()) {
1128 // get a new handler blob
1129 handler = set_handler_blob();
1130 }
1131 if (handler != NULL) {
1132 memcpy(handler, buffer->insts_begin(), insts_size);
1133 pd_set_handler(handler);
1134 ICache::invalidate_range(handler, insts_size);
1135 _handler = handler + insts_size;
1136 }
1137 return handler;
1138 }
1139
1140 void SignatureHandlerLibrary::add(methodHandle method) {
1141 if (method->signature_handler() == NULL) {
1142 // use slow signature handler if we can't do better
1143 int handler_index = -1;
1144 // check if we can use customized (fast) signature handler
1145 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1146 // use customized signature handler
1147 MutexLocker mu(SignatureHandlerLibrary_lock);
1148 // make sure data structure is initialized
1149 initialize();
1150 // lookup method signature's fingerprint
1151 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1152 handler_index = _fingerprints->find(fingerprint);
1153 // create handler if necessary
1154 if (handler_index < 0) {
1155 ResourceMark rm;
1156 ptrdiff_t align_offset = (address)
1157 round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1158 CodeBuffer buffer((address)(_buffer + align_offset),
1159 SignatureHandlerLibrary::buffer_size - align_offset);
1160 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1161 // copy into code heap
1162 address handler = set_handler(&buffer);
1163 if (handler == NULL) {
1164 // use slow signature handler
1165 } else {
1166 // debugging suppport
1167 if (PrintSignatureHandlers) {
1168 tty->cr();
1169 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1170 _handlers->length(),
1171 (method->is_static() ? "static" : "receiver"),
1172 method->name_and_sig_as_C_string(),
1173 fingerprint,
1174 buffer.insts_size());
1175 Disassembler::decode(handler, handler + buffer.insts_size());
1176 #ifndef PRODUCT
1177 tty->print_cr(" --- associated result handler ---");
1178 address rh_begin = Interpreter::result_handler(method()->result_type());
1179 address rh_end = rh_begin;
1180 while (*(int*)rh_end != 0) {
1181 rh_end += sizeof(int);
1182 }
1183 Disassembler::decode(rh_begin, rh_end);
1184 #endif
1185 }
1186 // add handler to library
1187 _fingerprints->append(fingerprint);
1188 _handlers->append(handler);
1189 // set handler index
1190 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1191 handler_index = _fingerprints->length() - 1;
1192 }
1193 }
1194 // Set handler under SignatureHandlerLibrary_lock
1195 if (handler_index < 0) {
1196 // use generic signature handler
1197 method->set_signature_handler(Interpreter::slow_signature_handler());
1198 } else {
1199 // set handler
1200 method->set_signature_handler(_handlers->at(handler_index));
1201 }
1202 } else {
1203 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1204 // use generic signature handler
1205 method->set_signature_handler(Interpreter::slow_signature_handler());
1206 }
1207 }
1208 #ifdef ASSERT
1209 int handler_index = -1;
1210 int fingerprint_index = -2;
1211 {
1212 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1213 // in any way if accessed from multiple threads. To avoid races with another
1214 // thread which may change the arrays in the above, mutex protected block, we
1215 // have to protect this read access here with the same mutex as well!
1216 MutexLocker mu(SignatureHandlerLibrary_lock);
1217 if (_handlers != NULL) {
1218 handler_index = _handlers->find(method->signature_handler());
1219 fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());
1220 }
1221 }
1222 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1223 handler_index == fingerprint_index, "sanity check");
1224 #endif // ASSERT
1225 }
1226
1227
1228 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1229 address SignatureHandlerLibrary::_handler = NULL;
1230 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1231 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1232 address SignatureHandlerLibrary::_buffer = NULL;
1233
1234
1235 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, methodOopDesc* method))
1236 methodHandle m(thread, method);
1237 assert(m->is_native(), "sanity check");
1238 // lookup native function entry point if it doesn't exist
1239 bool in_base_library;
1240 if (!m->has_native_function()) {
1241 NativeLookup::lookup(m, in_base_library, CHECK);
1242 }
1243 // make sure signature handler is installed
1244 SignatureHandlerLibrary::add(m);
1245 // The interpreter entry point checks the signature handler first,
1246 // before trying to fetch the native entry point and klass mirror.
1247 // We must set the signature handler last, so that multiple processors
1248 // preparing the same method will be sure to see non-null entry & mirror.
1249 IRT_END
1250
1251 #if defined(IA32) || defined(AMD64)
1252 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1253 if (src_address == dest_address) {
1254 return;
1255 }
1256 ResetNoHandleMark rnm; // In a LEAF entry.
1257 HandleMark hm;
1258 ResourceMark rm;
1259 frame fr = thread->last_frame();
1260 assert(fr.is_interpreted_frame(), "");
1261 jint bci = fr.interpreter_frame_bci();
1262 methodHandle mh(thread, fr.interpreter_frame_method());
1263 Bytecode_invoke invoke(mh, bci);
1264 ArgumentSizeComputer asc(invoke.signature());
1265 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1266 Copy::conjoint_jbytes(src_address, dest_address,
1267 size_of_arguments * Interpreter::stackElementSize);
1268 IRT_END
1269 #endif