1 /*
2 * Copyright (c) 1997, 2013, 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 "compiler/disassembler.hpp"
30 #include "gc_interface/collectedHeap.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/interpreterRuntime.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "interpreter/templateTable.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/constantPool.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/methodData.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 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
79
80 class UnlockFlagSaver {
81 private:
82 JavaThread* _thread;
83 bool _do_not_unlock;
84 public:
85 UnlockFlagSaver(JavaThread* t) {
86 _thread = t;
87 _do_not_unlock = t->do_not_unlock_if_synchronized();
88 t->set_do_not_unlock_if_synchronized(false);
89 }
90 ~UnlockFlagSaver() {
91 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
92 }
93 };
94
95 //------------------------------------------------------------------------------------------------------------------------
96 // State accessors
97
98 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
99 last_frame(thread).interpreter_frame_set_bcp(bcp);
100 if (ProfileInterpreter) {
101 // ProfileTraps uses MDOs independently of ProfileInterpreter.
102 // That is why we must check both ProfileInterpreter and mdo != NULL.
103 MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
104 if (mdo != NULL) {
105 NEEDS_CLEANUP;
106 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
107 }
108 }
109 }
110
111 //------------------------------------------------------------------------------------------------------------------------
112 // Constants
113
114
115 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
116 // access constant pool
117 ConstantPool* pool = method(thread)->constants();
118 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
119 constantTag tag = pool->tag_at(index);
120
121 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
122 Klass* klass = pool->klass_at(index, CHECK);
123 oop java_class = klass->java_mirror();
124 thread->set_vm_result(java_class);
125 IRT_END
126
127 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
128 assert(bytecode == Bytecodes::_fast_aldc ||
129 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
130 ResourceMark rm(thread);
131 methodHandle m (thread, method(thread));
132 Bytecode_loadconstant ldc(m, bci(thread));
133 oop result = ldc.resolve_constant(CHECK);
134 #ifdef ASSERT
135 {
136 // The bytecode wrappers aren't GC-safe so construct a new one
137 Bytecode_loadconstant ldc2(m, bci(thread));
138 oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
139 assert(result == coop, "expected result for assembly code");
140 }
141 #endif
142 thread->set_vm_result(result);
143 }
144 IRT_END
145
146
147 //------------------------------------------------------------------------------------------------------------------------
148 // Allocation
149
150 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
151 Klass* k_oop = pool->klass_at(index, CHECK);
152 instanceKlassHandle klass (THREAD, k_oop);
153
154 // Make sure we are not instantiating an abstract klass
155 klass->check_valid_for_instantiation(true, CHECK);
156
157 // Make sure klass is initialized
158 klass->initialize(CHECK);
159
160 // At this point the class may not be fully initialized
161 // because of recursive initialization. If it is fully
162 // initialized & has_finalized is not set, we rewrite
163 // it into its fast version (Note: no locking is needed
164 // here since this is an atomic byte write and can be
165 // done more than once).
166 //
167 // Note: In case of classes with has_finalized we don't
168 // rewrite since that saves us an extra check in
169 // the fast version which then would call the
170 // slow version anyway (and do a call back into
171 // Java).
172 // If we have a breakpoint, then we don't rewrite
173 // because the _breakpoint bytecode would be lost.
174 oop obj = klass->allocate_instance(CHECK);
175 thread->set_vm_result(obj);
176 IRT_END
177
178
179 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
180 oop obj = oopFactory::new_typeArray(type, size, CHECK);
181 thread->set_vm_result(obj);
182 IRT_END
183
184
185 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
186 // Note: no oopHandle for pool & klass needed since they are not used
187 // anymore after new_objArray() and no GC can happen before.
188 // (This may have to change if this code changes!)
189 Klass* klass = pool->klass_at(index, CHECK);
190 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
191 thread->set_vm_result(obj);
192 IRT_END
193
194
195 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
196 // We may want to pass in more arguments - could make this slightly faster
197 ConstantPool* constants = method(thread)->constants();
198 int i = get_index_u2(thread, Bytecodes::_multianewarray);
199 Klass* klass = constants->klass_at(i, CHECK);
200 int nof_dims = number_of_dimensions(thread);
201 assert(klass->is_klass(), "not a class");
202 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
203
204 // We must create an array of jints to pass to multi_allocate.
205 ResourceMark rm(thread);
206 const int small_dims = 10;
207 jint dim_array[small_dims];
208 jint *dims = &dim_array[0];
209 if (nof_dims > small_dims) {
210 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
211 }
212 for (int index = 0; index < nof_dims; index++) {
213 // offset from first_size_address is addressed as local[index]
214 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
215 dims[index] = first_size_address[n];
216 }
217 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
218 thread->set_vm_result(obj);
219 IRT_END
220
221
222 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
223 assert(obj->is_oop(), "must be a valid oop");
224 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
225 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
226 IRT_END
227
228
229 // Quicken instance-of and check-cast bytecodes
230 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
231 // Force resolving; quicken the bytecode
232 int which = get_index_u2(thread, Bytecodes::_checkcast);
233 ConstantPool* cpool = method(thread)->constants();
234 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
235 // program we might have seen an unquick'd bytecode in the interpreter but have another
236 // thread quicken the bytecode before we get here.
237 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
238 Klass* klass = cpool->klass_at(which, CHECK);
239 thread->set_vm_result_2(klass);
240 IRT_END
241
242
243 //------------------------------------------------------------------------------------------------------------------------
244 // Exceptions
245
246 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
247 methodHandle trap_method, int trap_bci, TRAPS) {
248 if (trap_method.not_null()) {
249 MethodData* trap_mdo = trap_method->method_data();
250 if (trap_mdo == NULL) {
251 Method::build_interpreter_method_data(trap_method, THREAD);
252 if (HAS_PENDING_EXCEPTION) {
253 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
254 "we expect only an OOM error here");
255 CLEAR_PENDING_EXCEPTION;
256 }
257 trap_mdo = trap_method->method_data();
258 // and fall through...
259 }
260 if (trap_mdo != NULL) {
261 // Update per-method count of trap events. The interpreter
262 // is updating the MDO to simulate the effect of compiler traps.
263 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
264 }
265 }
266 }
267
268 // Assume the compiler is (or will be) interested in this event.
269 // If necessary, create an MDO to hold the information, and record it.
270 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
271 assert(ProfileTraps, "call me only if profiling");
272 methodHandle trap_method(thread, method(thread));
273 int trap_bci = trap_method->bci_from(bcp(thread));
274 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
275 }
276
277 #ifdef CC_INTERP
278 // As legacy note_trap, but we have more arguments.
279 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
280 methodHandle trap_method(method);
281 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
282 IRT_END
283
284 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
285 // for each exception.
286 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
287 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
288 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
289 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
290 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
291 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
292 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
293 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
294 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
295 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
296 #endif // CC_INTERP
297
298
299 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
300 // get klass
301 InstanceKlass* klass = InstanceKlass::cast(k);
302 assert(klass->is_initialized(),
303 "this klass should have been initialized during VM initialization");
304 // create instance - do not call constructor since we may have no
305 // (java) stack space left (should assert constructor is empty)
306 Handle exception;
307 oop exception_oop = klass->allocate_instance(CHECK_(exception));
308 exception = Handle(THREAD, exception_oop);
309 if (StackTraceInThrowable) {
310 java_lang_Throwable::fill_in_stack_trace(exception);
311 }
312 return exception;
313 }
314
315 // Special handling for stack overflow: since we don't have any (java) stack
316 // space left we use the pre-allocated & pre-initialized StackOverflowError
317 // klass to create an stack overflow error instance. We do not call its
318 // constructor for the same reason (it is empty, anyway).
319 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
320 Handle exception = get_preinitialized_exception(
321 SystemDictionary::StackOverflowError_klass(),
322 CHECK);
323 THROW_HANDLE(exception);
324 IRT_END
325
326
327 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
328 // lookup exception klass
329 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
330 if (ProfileTraps) {
331 if (s == vmSymbols::java_lang_ArithmeticException()) {
332 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
333 } else if (s == vmSymbols::java_lang_NullPointerException()) {
334 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
335 }
336 }
337 // create exception
338 Handle exception = Exceptions::new_exception(thread, s, message);
339 thread->set_vm_result(exception());
340 IRT_END
341
342
343 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
344 ResourceMark rm(thread);
345 const char* klass_name = obj->klass()->external_name();
346 // lookup exception klass
347 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
348 if (ProfileTraps) {
349 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
350 }
351 // create exception, with klass name as detail message
352 Handle exception = Exceptions::new_exception(thread, s, klass_name);
353 thread->set_vm_result(exception());
354 IRT_END
355
356
357 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
358 char message[jintAsStringSize];
359 // lookup exception klass
360 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
361 if (ProfileTraps) {
362 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
363 }
364 // create exception
365 sprintf(message, "%d", index);
366 THROW_MSG(s, message);
367 IRT_END
368
369 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
370 JavaThread* thread, oopDesc* obj))
371
372 ResourceMark rm(thread);
373 char* message = SharedRuntime::generate_class_cast_message(
374 thread, obj->klass()->external_name());
375
376 if (ProfileTraps) {
377 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
378 }
379
380 // create exception
381 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
382 IRT_END
383
384 // exception_handler_for_exception(...) returns the continuation address,
385 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
386 // The exception oop is returned to make sure it is preserved over GC (it
387 // is only on the stack if the exception was thrown explicitly via athrow).
388 // During this operation, the expression stack contains the values for the
389 // bci where the exception happened. If the exception was propagated back
390 // from a call, the expression stack contains the values for the bci at the
391 // invoke w/o arguments (i.e., as if one were inside the call).
392 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
393
394 Handle h_exception(thread, exception);
395 methodHandle h_method (thread, method(thread));
396 constantPoolHandle h_constants(thread, h_method->constants());
397 bool should_repeat;
398 int handler_bci;
399 int current_bci = bci(thread);
400
401 // Need to do this check first since when _do_not_unlock_if_synchronized
402 // is set, we don't want to trigger any classloading which may make calls
403 // into java, or surprisingly find a matching exception handler for bci 0
404 // since at this moment the method hasn't been "officially" entered yet.
405 if (thread->do_not_unlock_if_synchronized()) {
406 ResourceMark rm;
407 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
408 thread->set_vm_result(exception);
409 #ifdef CC_INTERP
410 return (address) -1;
411 #else
412 return Interpreter::remove_activation_entry();
413 #endif
414 }
415
416 do {
417 should_repeat = false;
418
419 // assertions
420 #ifdef ASSERT
421 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
422 assert(h_exception->is_oop(), "just checking");
423 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
424 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
425 if (ExitVMOnVerifyError) vm_exit(-1);
426 ShouldNotReachHere();
427 }
428 #endif
429
430 // tracing
431 if (TraceExceptions) {
432 ttyLocker ttyl;
433 ResourceMark rm(thread);
434 tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());
435 tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
436 tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
437 }
438 // Don't go paging in something which won't be used.
439 // else if (extable->length() == 0) {
440 // // disabled for now - interpreter is not using shortcut yet
441 // // (shortcut is not to call runtime if we have no exception handlers)
442 // // warning("performance bug: should not call runtime if method has no exception handlers");
443 // }
444 // for AbortVMOnException flag
445 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
446
447 // exception handler lookup
448 KlassHandle h_klass(THREAD, h_exception->klass());
449 handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD);
450 if (HAS_PENDING_EXCEPTION) {
451 // We threw an exception while trying to find the exception handler.
452 // Transfer the new exception to the exception handle which will
453 // be set into thread local storage, and do another lookup for an
454 // exception handler for this exception, this time starting at the
455 // BCI of the exception handler which caused the exception to be
456 // thrown (bug 4307310).
457 h_exception = Handle(THREAD, PENDING_EXCEPTION);
458 CLEAR_PENDING_EXCEPTION;
459 if (handler_bci >= 0) {
460 current_bci = handler_bci;
461 should_repeat = true;
462 }
463 }
464 } while (should_repeat == true);
465
466 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
467 // time throw or a stack unwinding throw and accordingly notify the debugger
468 if (JvmtiExport::can_post_on_exceptions()) {
469 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
470 }
471
472 #ifdef CC_INTERP
473 address continuation = (address)(intptr_t) handler_bci;
474 #else
475 address continuation = NULL;
476 #endif
477 address handler_pc = NULL;
478 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
479 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
480 // handler in this method, or (b) after a stack overflow there is not yet
481 // enough stack space available to reprotect the stack.
482 #ifndef CC_INTERP
483 continuation = Interpreter::remove_activation_entry();
484 #endif
485 // Count this for compilation purposes
486 h_method->interpreter_throwout_increment(THREAD);
487 } else {
488 // handler in this method => change bci/bcp to handler bci/bcp and continue there
489 handler_pc = h_method->code_base() + handler_bci;
490 #ifndef CC_INTERP
491 set_bcp_and_mdp(handler_pc, thread);
492 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
493 #endif
494 }
495 // notify debugger of an exception catch
496 // (this is good for exceptions caught in native methods as well)
497 if (JvmtiExport::can_post_on_exceptions()) {
498 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
499 }
500
501 thread->set_vm_result(h_exception());
502 return continuation;
503 IRT_END
504
505
506 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
507 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
508 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
509 IRT_END
510
511
512 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
513 THROW(vmSymbols::java_lang_AbstractMethodError());
514 IRT_END
515
516
517 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
518 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
519 IRT_END
520
521
522 //------------------------------------------------------------------------------------------------------------------------
523 // Fields
524 //
525
526 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
527 // resolve field
528 fieldDescriptor info;
529 constantPoolHandle pool(thread, method(thread)->constants());
530 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_putstatic);
531 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
532
533 {
534 JvmtiHideSingleStepping jhss(thread);
535 LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
536 bytecode, 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 Bytecodes::Code put_code = (Bytecodes::Code)0;
551
552 // We also need to delay resolving getstatic instructions until the
553 // class is intitialized. This is required so that access to the static
554 // field will call the initialization function every time until the class
555 // is completely initialized ala. in 2.17.5 in JVM Specification.
556 InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
557 bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
558 !klass->is_initialized());
559 Bytecodes::Code get_code = (Bytecodes::Code)0;
560
561 if (!uninitialized_static) {
562 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
563 if (is_put || !info.access_flags().is_final()) {
564 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
565 }
566 }
567
568 cache_entry(thread)->set_field(
569 get_code,
570 put_code,
571 info.field_holder(),
572 info.index(),
573 info.offset(),
574 state,
575 info.access_flags().is_final(),
576 info.access_flags().is_volatile(),
577 pool->pool_holder()
578 );
579 IRT_END
580
581
582 //------------------------------------------------------------------------------------------------------------------------
583 // Synchronization
584 //
585 // The interpreter's synchronization code is factored out so that it can
586 // be shared by method invocation and synchronized blocks.
587 //%note synchronization_3
588
589 //%note monitor_1
590 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
591 #ifdef ASSERT
592 thread->last_frame().interpreter_frame_verify_monitor(elem);
593 #endif
594 if (PrintBiasedLockingStatistics) {
595 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
596 }
597 Handle h_obj(thread, elem->obj());
598 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
599 "must be NULL or an object");
600 if (UseBiasedLocking) {
601 // Retry fast entry if bias is revoked to avoid unnecessary inflation
602 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
603 } else {
604 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
605 }
606 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
607 "must be NULL or an object");
608 #ifdef ASSERT
609 thread->last_frame().interpreter_frame_verify_monitor(elem);
610 #endif
611 IRT_END
612
613
614 //%note monitor_1
615 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
616 #ifdef ASSERT
617 thread->last_frame().interpreter_frame_verify_monitor(elem);
618 #endif
619 Handle h_obj(thread, elem->obj());
620 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
621 "must be NULL or an object");
622 if (elem == NULL || h_obj()->is_unlocked()) {
623 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
624 }
625 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
626 // Free entry. This must be done here, since a pending exception might be installed on
627 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
628 elem->set_obj(NULL);
629 #ifdef ASSERT
630 thread->last_frame().interpreter_frame_verify_monitor(elem);
631 #endif
632 IRT_END
633
634
635 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
636 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
637 IRT_END
638
639
640 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
641 // Returns an illegal exception to install into the current thread. The
642 // pending_exception flag is cleared so normal exception handling does not
643 // trigger. Any current installed exception will be overwritten. This
644 // method will be called during an exception unwind.
645
646 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
647 Handle exception(thread, thread->vm_result());
648 assert(exception() != NULL, "vm result should be set");
649 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
650 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
651 exception = get_preinitialized_exception(
652 SystemDictionary::IllegalMonitorStateException_klass(),
653 CATCH);
654 }
655 thread->set_vm_result(exception());
656 IRT_END
657
658
659 //------------------------------------------------------------------------------------------------------------------------
660 // Invokes
661
662 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
663 return method->orig_bytecode_at(method->bci_from(bcp));
664 IRT_END
665
666 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
667 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
668 IRT_END
669
670 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
671 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
672 IRT_END
673
674 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
675 // extract receiver from the outgoing argument list if necessary
676 Handle receiver(thread, NULL);
677 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
678 ResourceMark rm(thread);
679 methodHandle m (thread, method(thread));
680 Bytecode_invoke call(m, bci(thread));
681 Symbol* signature = call.signature();
682 receiver = Handle(thread,
683 thread->last_frame().interpreter_callee_receiver(signature));
684 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
685 "sanity check");
686 assert(receiver.is_null() ||
687 !Universe::heap()->is_in_reserved(receiver->klass()),
688 "sanity check");
689 }
690
691 // resolve method
692 CallInfo info;
693 constantPoolHandle pool(thread, method(thread)->constants());
694
695 {
696 JvmtiHideSingleStepping jhss(thread);
697 LinkResolver::resolve_invoke(info, receiver, pool,
698 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
699 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
700 int retry_count = 0;
701 while (info.resolved_method()->is_old()) {
702 // It is very unlikely that method is redefined more than 100 times
703 // in the middle of resolve. If it is looping here more than 100 times
704 // means then there could be a bug here.
705 guarantee((retry_count++ < 100),
706 "Could not resolve to latest version of redefined method");
707 // method is redefined in the middle of resolve so re-try.
708 LinkResolver::resolve_invoke(info, receiver, pool,
709 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
710 }
711 }
712 } // end JvmtiHideSingleStepping
713
714 // check if link resolution caused cpCache to be updated
715 if (already_resolved(thread)) return;
716
717 if (bytecode == Bytecodes::_invokeinterface) {
718 if (TraceItables && Verbose) {
719 ResourceMark rm(thread);
720 tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
721 }
722 }
723 #ifdef ASSERT
724 if (bytecode == Bytecodes::_invokeinterface) {
725 if (info.resolved_method()->method_holder() ==
726 SystemDictionary::Object_klass()) {
727 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
728 // (see also CallInfo::set_interface for details)
729 assert(info.call_kind() == CallInfo::vtable_call ||
730 info.call_kind() == CallInfo::direct_call, "");
731 methodHandle rm = info.resolved_method();
732 assert(rm->is_final() || info.has_vtable_index(),
733 "should have been set already");
734 } else if (!info.resolved_method()->has_itable_index()) {
735 // Resolved something like CharSequence.toString. Use vtable not itable.
736 assert(info.call_kind() != CallInfo::itable_call, "");
737 } else {
738 // Setup itable entry
739 assert(info.call_kind() == CallInfo::itable_call, "");
740 int index = info.resolved_method()->itable_index();
741 assert(info.itable_index() == index, "");
742 }
743 } else {
744 assert(info.call_kind() == CallInfo::direct_call ||
745 info.call_kind() == CallInfo::vtable_call, "");
746 }
747 #endif
748 switch (info.call_kind()) {
749 case CallInfo::direct_call:
750 cache_entry(thread)->set_direct_call(
751 bytecode,
752 info.resolved_method());
753 break;
754 case CallInfo::vtable_call:
755 cache_entry(thread)->set_vtable_call(
756 bytecode,
757 info.resolved_method(),
758 info.vtable_index());
759 break;
760 case CallInfo::itable_call:
761 cache_entry(thread)->set_itable_call(
762 bytecode,
763 info.resolved_method(),
764 info.itable_index());
765 break;
766 default: ShouldNotReachHere();
767 }
768 }
769 IRT_END
770
771
772 // First time execution: Resolve symbols, create a permanent MethodType object.
773 IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) {
774 assert(EnableInvokeDynamic, "");
775 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
776
777 // resolve method
778 CallInfo info;
779 constantPoolHandle pool(thread, method(thread)->constants());
780
781 {
782 JvmtiHideSingleStepping jhss(thread);
783 LinkResolver::resolve_invoke(info, Handle(), pool,
784 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
785 } // end JvmtiHideSingleStepping
786
787 cache_entry(thread)->set_method_handle(pool, info);
788 }
789 IRT_END
790
791
792 // First time execution: Resolve symbols, create a permanent CallSite object.
793 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
794 assert(EnableInvokeDynamic, "");
795 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
796
797 //TO DO: consider passing BCI to Java.
798 // int caller_bci = method(thread)->bci_from(bcp(thread));
799
800 // resolve method
801 CallInfo info;
802 constantPoolHandle pool(thread, method(thread)->constants());
803 int index = get_index_u4(thread, bytecode);
804 {
805 JvmtiHideSingleStepping jhss(thread);
806 LinkResolver::resolve_invoke(info, Handle(), pool,
807 index, bytecode, CHECK);
808 } // end JvmtiHideSingleStepping
809
810 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
811 cp_cache_entry->set_dynamic_call(pool, info);
812 }
813 IRT_END
814
815
816 //------------------------------------------------------------------------------------------------------------------------
817 // Miscellaneous
818
819
820 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
821 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
822 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
823 if (branch_bcp != NULL && nm != NULL) {
824 // This was a successful request for an OSR nmethod. Because
825 // frequency_counter_overflow_inner ends with a safepoint check,
826 // nm could have been unloaded so look it up again. It's unsafe
827 // to examine nm directly since it might have been freed and used
828 // for something else.
829 frame fr = thread->last_frame();
830 Method* method = fr.interpreter_frame_method();
831 int bci = method->bci_from(fr.interpreter_frame_bcp());
832 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
833 }
834 #ifndef PRODUCT
835 if (TraceOnStackReplacement) {
836 if (nm != NULL) {
837 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry());
838 nm->print();
839 }
840 }
841 #endif
842 return nm;
843 }
844
845 IRT_ENTRY(nmethod*,
846 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
847 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
848 // flag, in case this method triggers classloading which will call into Java.
849 UnlockFlagSaver fs(thread);
850
851 frame fr = thread->last_frame();
852 assert(fr.is_interpreted_frame(), "must come from interpreter");
853 methodHandle method(thread, fr.interpreter_frame_method());
854 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
855 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
856
857 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
858 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
859 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
860
861 if (osr_nm != NULL) {
862 // We may need to do on-stack replacement which requires that no
863 // monitors in the activation are biased because their
864 // BasicObjectLocks will need to migrate during OSR. Force
865 // unbiasing of all monitors in the activation now (even though
866 // the OSR nmethod might be invalidated) because we don't have a
867 // safepoint opportunity later once the migration begins.
868 if (UseBiasedLocking) {
869 ResourceMark rm;
870 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
871 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
872 kptr < fr.interpreter_frame_monitor_begin();
873 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
874 if( kptr->obj() != NULL ) {
875 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
876 }
877 }
878 BiasedLocking::revoke(objects_to_revoke);
879 }
880 }
881 return osr_nm;
882 IRT_END
883
884 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
885 assert(ProfileInterpreter, "must be profiling interpreter");
886 int bci = method->bci_from(cur_bcp);
887 MethodData* mdo = method->method_data();
888 if (mdo == NULL) return 0;
889 return mdo->bci_to_di(bci);
890 IRT_END
891
892 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
893 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
894 // flag, in case this method triggers classloading which will call into Java.
895 UnlockFlagSaver fs(thread);
896
897 assert(ProfileInterpreter, "must be profiling interpreter");
898 frame fr = thread->last_frame();
899 assert(fr.is_interpreted_frame(), "must come from interpreter");
900 methodHandle method(thread, fr.interpreter_frame_method());
901 Method::build_interpreter_method_data(method, THREAD);
902 if (HAS_PENDING_EXCEPTION) {
903 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
904 CLEAR_PENDING_EXCEPTION;
905 // and fall through...
906 }
907 IRT_END
908
909
910 #ifdef ASSERT
911 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
912 assert(ProfileInterpreter, "must be profiling interpreter");
913
914 MethodData* mdo = method->method_data();
915 assert(mdo != NULL, "must not be null");
916
917 int bci = method->bci_from(bcp);
918
919 address mdp2 = mdo->bci_to_dp(bci);
920 if (mdp != mdp2) {
921 ResourceMark rm;
922 ResetNoHandleMark rnm; // In a LEAF entry.
923 HandleMark hm;
924 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
925 int current_di = mdo->dp_to_di(mdp);
926 int expected_di = mdo->dp_to_di(mdp2);
927 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
928 int expected_approx_bci = mdo->data_at(expected_di)->bci();
929 int approx_bci = -1;
930 if (current_di >= 0) {
931 approx_bci = mdo->data_at(current_di)->bci();
932 }
933 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
934 mdo->print_on(tty);
935 method->print_codes();
936 }
937 assert(mdp == mdp2, "wrong mdp");
938 IRT_END
939 #endif // ASSERT
940
941 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
942 assert(ProfileInterpreter, "must be profiling interpreter");
943 ResourceMark rm(thread);
944 HandleMark hm(thread);
945 frame fr = thread->last_frame();
946 assert(fr.is_interpreted_frame(), "must come from interpreter");
947 MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
948
949 // Grab a lock to ensure atomic access to setting the return bci and
950 // the displacement. This can block and GC, invalidating all naked oops.
951 MutexLocker ml(RetData_lock);
952
953 // ProfileData is essentially a wrapper around a derived oop, so we
954 // need to take the lock before making any ProfileData structures.
955 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
956 RetData* rdata = data->as_RetData();
957 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
958 fr.interpreter_frame_set_mdp(new_mdp);
959 IRT_END
960
961 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
962 MethodCounters* mcs = Method::build_method_counters(m, thread);
963 if (HAS_PENDING_EXCEPTION) {
964 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
965 CLEAR_PENDING_EXCEPTION;
966 }
967 return mcs;
968 IRT_END
969
970
971 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
972 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
973 // stack traversal automatically takes care of preserving arguments for invoke, so
974 // this is no longer needed.
975
976 // IRT_END does an implicit safepoint check, hence we are guaranteed to block
977 // if this is called during a safepoint
978
979 if (JvmtiExport::should_post_single_step()) {
980 // We are called during regular safepoints and when the VM is
981 // single stepping. If any thread is marked for single stepping,
982 // then we may have JVMTI work to do.
983 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
984 }
985 IRT_END
986
987 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
988 ConstantPoolCacheEntry *cp_entry))
989
990 // check the access_flags for the field in the klass
991
992 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
993 int index = cp_entry->field_index();
994 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
995
996 switch(cp_entry->flag_state()) {
997 case btos: // fall through
998 case ctos: // fall through
999 case stos: // fall through
1000 case itos: // fall through
1001 case ftos: // fall through
1002 case ltos: // fall through
1003 case dtos: // fall through
1004 case atos: break;
1005 default: ShouldNotReachHere(); return;
1006 }
1007 bool is_static = (obj == NULL);
1008 HandleMark hm(thread);
1009
1010 Handle h_obj;
1011 if (!is_static) {
1012 // non-static field accessors have an object, but we need a handle
1013 h_obj = Handle(thread, obj);
1014 }
1015 instanceKlassHandle h_cp_entry_f1(thread, (Klass*)cp_entry->f1_as_klass());
1016 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static);
1017 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
1018 IRT_END
1019
1020 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1021 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1022
1023 Klass* k = (Klass*)cp_entry->f1_as_klass();
1024
1025 // check the access_flags for the field in the klass
1026 InstanceKlass* ik = InstanceKlass::cast(k);
1027 int index = cp_entry->field_index();
1028 // bail out if field modifications are not watched
1029 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1030
1031 char sig_type = '\0';
1032
1033 switch(cp_entry->flag_state()) {
1034 case btos: sig_type = 'Z'; break;
1035 case ctos: sig_type = 'C'; break;
1036 case stos: sig_type = 'S'; break;
1037 case itos: sig_type = 'I'; break;
1038 case ftos: sig_type = 'F'; break;
1039 case atos: sig_type = 'L'; break;
1040 case ltos: sig_type = 'J'; break;
1041 case dtos: sig_type = 'D'; break;
1042 default: ShouldNotReachHere(); return;
1043 }
1044 bool is_static = (obj == NULL);
1045
1046 HandleMark hm(thread);
1047 instanceKlassHandle h_klass(thread, k);
1048 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static);
1049 jvalue fvalue;
1050 #ifdef _LP64
1051 fvalue = *value;
1052 #else
1053 // Long/double values are stored unaligned and also noncontiguously with
1054 // tagged stacks. We can't just do a simple assignment even in the non-
1055 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1056 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1057 // We assume that the two halves of longs/doubles are stored in interpreter
1058 // stack slots in platform-endian order.
1059 jlong_accessor u;
1060 jint* newval = (jint*)value;
1061 u.words[0] = newval[0];
1062 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1063 fvalue.j = u.long_value;
1064 #endif // _LP64
1065
1066 Handle h_obj;
1067 if (!is_static) {
1068 // non-static field accessors have an object, but we need a handle
1069 h_obj = Handle(thread, obj);
1070 }
1071
1072 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1073 fid, sig_type, &fvalue);
1074 IRT_END
1075
1076 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1077 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1078 IRT_END
1079
1080
1081 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1082 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1083 IRT_END
1084
1085 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1086 {
1087 return (Interpreter::contains(pc) ? 1 : 0);
1088 }
1089 IRT_END
1090
1091
1092 // Implementation of SignatureHandlerLibrary
1093
1094 address SignatureHandlerLibrary::set_handler_blob() {
1095 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1096 if (handler_blob == NULL) {
1097 return NULL;
1098 }
1099 address handler = handler_blob->code_begin();
1100 _handler_blob = handler_blob;
1101 _handler = handler;
1102 return handler;
1103 }
1104
1105 void SignatureHandlerLibrary::initialize() {
1106 if (_fingerprints != NULL) {
1107 return;
1108 }
1109 if (set_handler_blob() == NULL) {
1110 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1111 }
1112
1113 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1114 SignatureHandlerLibrary::buffer_size);
1115 _buffer = bb->code_begin();
1116
1117 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1118 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1119 }
1120
1121 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1122 address handler = _handler;
1123 int insts_size = buffer->pure_insts_size();
1124 if (handler + insts_size > _handler_blob->code_end()) {
1125 // get a new handler blob
1126 handler = set_handler_blob();
1127 }
1128 if (handler != NULL) {
1129 memcpy(handler, buffer->insts_begin(), insts_size);
1130 pd_set_handler(handler);
1131 ICache::invalidate_range(handler, insts_size);
1132 _handler = handler + insts_size;
1133 }
1134 return handler;
1135 }
1136
1137 void SignatureHandlerLibrary::add(methodHandle method) {
1138 if (method->signature_handler() == NULL) {
1139 // use slow signature handler if we can't do better
1140 int handler_index = -1;
1141 // check if we can use customized (fast) signature handler
1142 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1143 // use customized signature handler
1144 MutexLocker mu(SignatureHandlerLibrary_lock);
1145 // make sure data structure is initialized
1146 initialize();
1147 // lookup method signature's fingerprint
1148 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1149 handler_index = _fingerprints->find(fingerprint);
1150 // create handler if necessary
1151 if (handler_index < 0) {
1152 ResourceMark rm;
1153 ptrdiff_t align_offset = (address)
1154 round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1155 CodeBuffer buffer((address)(_buffer + align_offset),
1156 SignatureHandlerLibrary::buffer_size - align_offset);
1157 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1158 // copy into code heap
1159 address handler = set_handler(&buffer);
1160 if (handler == NULL) {
1161 // use slow signature handler
1162 } else {
1163 // debugging suppport
1164 if (PrintSignatureHandlers) {
1165 tty->cr();
1166 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1167 _handlers->length(),
1168 (method->is_static() ? "static" : "receiver"),
1169 method->name_and_sig_as_C_string(),
1170 fingerprint,
1171 buffer.insts_size());
1172 Disassembler::decode(handler, handler + buffer.insts_size());
1173 #ifndef PRODUCT
1174 tty->print_cr(" --- associated result handler ---");
1175 address rh_begin = Interpreter::result_handler(method()->result_type());
1176 address rh_end = rh_begin;
1177 while (*(int*)rh_end != 0) {
1178 rh_end += sizeof(int);
1179 }
1180 Disassembler::decode(rh_begin, rh_end);
1181 #endif
1182 }
1183 // add handler to library
1184 _fingerprints->append(fingerprint);
1185 _handlers->append(handler);
1186 // set handler index
1187 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1188 handler_index = _fingerprints->length() - 1;
1189 }
1190 }
1191 // Set handler under SignatureHandlerLibrary_lock
1192 if (handler_index < 0) {
1193 // use generic signature handler
1194 method->set_signature_handler(Interpreter::slow_signature_handler());
1195 } else {
1196 // set handler
1197 method->set_signature_handler(_handlers->at(handler_index));
1198 }
1199 } else {
1200 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1201 // use generic signature handler
1202 method->set_signature_handler(Interpreter::slow_signature_handler());
1203 }
1204 }
1205 #ifdef ASSERT
1206 int handler_index = -1;
1207 int fingerprint_index = -2;
1208 {
1209 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1210 // in any way if accessed from multiple threads. To avoid races with another
1211 // thread which may change the arrays in the above, mutex protected block, we
1212 // have to protect this read access here with the same mutex as well!
1213 MutexLocker mu(SignatureHandlerLibrary_lock);
1214 if (_handlers != NULL) {
1215 handler_index = _handlers->find(method->signature_handler());
1216 fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());
1217 }
1218 }
1219 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1220 handler_index == fingerprint_index, "sanity check");
1221 #endif // ASSERT
1222 }
1223
1224
1225 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1226 address SignatureHandlerLibrary::_handler = NULL;
1227 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1228 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1229 address SignatureHandlerLibrary::_buffer = NULL;
1230
1231
1232 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1233 methodHandle m(thread, method);
1234 assert(m->is_native(), "sanity check");
1235 // lookup native function entry point if it doesn't exist
1236 bool in_base_library;
1237 if (!m->has_native_function()) {
1238 NativeLookup::lookup(m, in_base_library, CHECK);
1239 }
1240 // make sure signature handler is installed
1241 SignatureHandlerLibrary::add(m);
1242 // The interpreter entry point checks the signature handler first,
1243 // before trying to fetch the native entry point and klass mirror.
1244 // We must set the signature handler last, so that multiple processors
1245 // preparing the same method will be sure to see non-null entry & mirror.
1246 IRT_END
1247
1248 #if defined(IA32) || defined(AMD64) || defined(ARM)
1249 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1250 if (src_address == dest_address) {
1251 return;
1252 }
1253 ResetNoHandleMark rnm; // In a LEAF entry.
1254 HandleMark hm;
1255 ResourceMark rm;
1256 frame fr = thread->last_frame();
1257 assert(fr.is_interpreted_frame(), "");
1258 jint bci = fr.interpreter_frame_bci();
1259 methodHandle mh(thread, fr.interpreter_frame_method());
1260 Bytecode_invoke invoke(mh, bci);
1261 ArgumentSizeComputer asc(invoke.signature());
1262 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1263 Copy::conjoint_jbytes(src_address, dest_address,
1264 size_of_arguments * Interpreter::stackElementSize);
1265 IRT_END
1266 #endif
1267
1268 #if INCLUDE_JVMTI
1269 // This is a support of the JVMTI PopFrame interface.
1270 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1271 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1272 // The dmh argument is a reference to a DirectMethoHandle that has a member name field.
1273 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address dmh,
1274 Method* method, address bcp))
1275 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1276 if (code != Bytecodes::_invokestatic) {
1277 return;
1278 }
1279 ConstantPool* cpool = method->constants();
1280 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1281 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1282 Symbol* mname = cpool->name_ref_at(cp_index);
1283
1284 if (MethodHandles::has_member_arg(cname, mname)) {
1285 oop member_name = java_lang_invoke_DirectMethodHandle::member((oop)dmh);
1286 thread->set_vm_result(member_name);
1287 }
1288 IRT_END
1289 #endif // INCLUDE_JVMTI