1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/disassembler.hpp"
31 #include "gc_interface/collectedHeap.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "interpreter/templateTable.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/constantPool.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/methodData.hpp"
41 #include "oops/objArrayKlass.hpp"
42 #include "oops/objArrayOop.inline.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/symbol.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "prims/nativeLookup.hpp"
47 #include "runtime/atomic.inline.hpp"
48 #include "runtime/biasedLocking.hpp"
49 #include "runtime/compilationPolicy.hpp"
50 #include "runtime/deoptimization.hpp"
51 #include "runtime/fieldDescriptor.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/icache.hpp"
54 #include "runtime/interfaceSupport.hpp"
55 #include "runtime/java.hpp"
56 #include "runtime/jfieldIDWorkaround.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/synchronizer.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "utilities/events.hpp"
63 #ifdef COMPILER2
64 #include "opto/runtime.hpp"
65 #endif
66
67 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
68
69 class UnlockFlagSaver {
70 private:
71 JavaThread* _thread;
72 bool _do_not_unlock;
73 public:
74 UnlockFlagSaver(JavaThread* t) {
75 _thread = t;
76 _do_not_unlock = t->do_not_unlock_if_synchronized();
77 t->set_do_not_unlock_if_synchronized(false);
78 }
79 ~UnlockFlagSaver() {
80 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
81 }
82 };
83
84 //------------------------------------------------------------------------------------------------------------------------
85 // State accessors
86
87 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
88 last_frame(thread).interpreter_frame_set_bcp(bcp);
89 if (ProfileInterpreter) {
90 // ProfileTraps uses MDOs independently of ProfileInterpreter.
91 // That is why we must check both ProfileInterpreter and mdo != NULL.
92 MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
93 if (mdo != NULL) {
94 NEEDS_CLEANUP;
95 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
96 }
97 }
98 }
99
100 //------------------------------------------------------------------------------------------------------------------------
101 // Constants
102
103
104 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
105 // access constant pool
106 ConstantPool* pool = method(thread)->constants();
107 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
108 constantTag tag = pool->tag_at(index);
109
110 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
111 Klass* klass = pool->klass_at(index, CHECK);
112 oop java_class = klass->java_mirror();
113 thread->set_vm_result(java_class);
114 IRT_END
115
116 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
117 assert(bytecode == Bytecodes::_fast_aldc ||
118 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
119 ResourceMark rm(thread);
120 methodHandle m (thread, method(thread));
121 Bytecode_loadconstant ldc(m, bci(thread));
122 oop result = ldc.resolve_constant(CHECK);
123 #ifdef ASSERT
124 {
125 // The bytecode wrappers aren't GC-safe so construct a new one
126 Bytecode_loadconstant ldc2(m, bci(thread));
127 oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
128 assert(result == coop, "expected result for assembly code");
129 }
130 #endif
131 thread->set_vm_result(result);
132 }
133 IRT_END
134
135
136 //------------------------------------------------------------------------------------------------------------------------
137 // Allocation
138
139 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
140 Klass* k_oop = pool->klass_at(index, CHECK);
141 instanceKlassHandle klass (THREAD, k_oop);
142
143 // Make sure we are not instantiating an abstract klass
144 klass->check_valid_for_instantiation(true, CHECK);
145
146 // Make sure klass is initialized
147 klass->initialize(CHECK);
148
149 // At this point the class may not be fully initialized
150 // because of recursive initialization. If it is fully
151 // initialized & has_finalized is not set, we rewrite
152 // it into its fast version (Note: no locking is needed
153 // here since this is an atomic byte write and can be
154 // done more than once).
155 //
156 // Note: In case of classes with has_finalized we don't
157 // rewrite since that saves us an extra check in
158 // the fast version which then would call the
159 // slow version anyway (and do a call back into
160 // Java).
161 // If we have a breakpoint, then we don't rewrite
162 // because the _breakpoint bytecode would be lost.
163 oop obj = klass->allocate_instance(CHECK);
164 thread->set_vm_result(obj);
165 IRT_END
166
167
168 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
169 oop obj = oopFactory::new_typeArray(type, size, CHECK);
170 thread->set_vm_result(obj);
171 IRT_END
172
173
174 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
175 // Note: no oopHandle for pool & klass needed since they are not used
176 // anymore after new_objArray() and no GC can happen before.
177 // (This may have to change if this code changes!)
178 Klass* klass = pool->klass_at(index, CHECK);
179 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
180 thread->set_vm_result(obj);
181 IRT_END
182
183
184 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
185 // We may want to pass in more arguments - could make this slightly faster
186 ConstantPool* constants = method(thread)->constants();
187 int i = get_index_u2(thread, Bytecodes::_multianewarray);
188 Klass* klass = constants->klass_at(i, CHECK);
189 int nof_dims = number_of_dimensions(thread);
190 assert(klass->is_klass(), "not a class");
191 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
192
193 // We must create an array of jints to pass to multi_allocate.
194 ResourceMark rm(thread);
195 const int small_dims = 10;
196 jint dim_array[small_dims];
197 jint *dims = &dim_array[0];
198 if (nof_dims > small_dims) {
199 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
200 }
201 for (int index = 0; index < nof_dims; index++) {
202 // offset from first_size_address is addressed as local[index]
203 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
204 dims[index] = first_size_address[n];
205 }
206 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
207 thread->set_vm_result(obj);
208 IRT_END
209
210
211 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
212 assert(obj->is_oop(), "must be a valid oop");
213 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
214 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
215 IRT_END
216
217
218 // Quicken instance-of and check-cast bytecodes
219 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
220 // Force resolving; quicken the bytecode
221 int which = get_index_u2(thread, Bytecodes::_checkcast);
222 ConstantPool* cpool = method(thread)->constants();
223 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
224 // program we might have seen an unquick'd bytecode in the interpreter but have another
225 // thread quicken the bytecode before we get here.
226 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
227 Klass* klass = cpool->klass_at(which, CHECK);
228 thread->set_vm_result_2(klass);
229 IRT_END
230
231
232 //------------------------------------------------------------------------------------------------------------------------
233 // Exceptions
234
235 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
236 methodHandle trap_method, int trap_bci, TRAPS) {
237 if (trap_method.not_null()) {
238 MethodData* trap_mdo = trap_method->method_data();
239 if (trap_mdo == NULL) {
240 Method::build_interpreter_method_data(trap_method, THREAD);
241 if (HAS_PENDING_EXCEPTION) {
242 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
243 "we expect only an OOM error here");
244 CLEAR_PENDING_EXCEPTION;
245 }
246 trap_mdo = trap_method->method_data();
247 // and fall through...
248 }
249 if (trap_mdo != NULL) {
250 // Update per-method count of trap events. The interpreter
251 // is updating the MDO to simulate the effect of compiler traps.
252 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
253 }
254 }
255 }
256
257 // Assume the compiler is (or will be) interested in this event.
258 // If necessary, create an MDO to hold the information, and record it.
259 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
260 assert(ProfileTraps, "call me only if profiling");
261 methodHandle trap_method(thread, method(thread));
262 int trap_bci = trap_method->bci_from(bcp(thread));
263 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
264 }
265
266 #ifdef CC_INTERP
267 // As legacy note_trap, but we have more arguments.
268 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
269 methodHandle trap_method(method);
270 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
271 IRT_END
272
273 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
274 // for each exception.
275 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
276 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
277 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
278 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
279 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
280 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
281 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
282 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
283 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
284 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
285 #endif // CC_INTERP
286
287
288 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
289 // get klass
290 InstanceKlass* klass = InstanceKlass::cast(k);
291 assert(klass->is_initialized(),
292 "this klass should have been initialized during VM initialization");
293 // create instance - do not call constructor since we may have no
294 // (java) stack space left (should assert constructor is empty)
295 Handle exception;
296 oop exception_oop = klass->allocate_instance(CHECK_(exception));
297 exception = Handle(THREAD, exception_oop);
298 if (StackTraceInThrowable) {
299 java_lang_Throwable::fill_in_stack_trace(exception);
300 }
301 return exception;
302 }
303
304 // Special handling for stack overflow: since we don't have any (java) stack
305 // space left we use the pre-allocated & pre-initialized StackOverflowError
306 // klass to create an stack overflow error instance. We do not call its
307 // constructor for the same reason (it is empty, anyway).
308 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
309 Handle exception = get_preinitialized_exception(
310 SystemDictionary::StackOverflowError_klass(),
311 CHECK);
312 THROW_HANDLE(exception);
313 IRT_END
314
315
316 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
317 // lookup exception klass
318 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
319 if (ProfileTraps) {
320 if (s == vmSymbols::java_lang_ArithmeticException()) {
321 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
322 } else if (s == vmSymbols::java_lang_NullPointerException()) {
323 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
324 }
325 }
326 // create exception
327 Handle exception = Exceptions::new_exception(thread, s, message);
328 thread->set_vm_result(exception());
329 IRT_END
330
331
332 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
333 ResourceMark rm(thread);
334 const char* klass_name = obj->klass()->external_name();
335 // lookup exception klass
336 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
337 if (ProfileTraps) {
338 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
339 }
340 // create exception, with klass name as detail message
341 Handle exception = Exceptions::new_exception(thread, s, klass_name);
342 thread->set_vm_result(exception());
343 IRT_END
344
345
346 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
347 char message[jintAsStringSize];
348 // lookup exception klass
349 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
350 if (ProfileTraps) {
351 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
352 }
353 // create exception
354 sprintf(message, "%d", index);
355 THROW_MSG(s, message);
356 IRT_END
357
358 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
359 JavaThread* thread, oopDesc* obj))
360
361 ResourceMark rm(thread);
362 char* message = SharedRuntime::generate_class_cast_message(
363 thread, obj->klass()->external_name());
364
365 if (ProfileTraps) {
366 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
367 }
368
369 // create exception
370 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
371 IRT_END
372
373 // exception_handler_for_exception(...) returns the continuation address,
374 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
375 // The exception oop is returned to make sure it is preserved over GC (it
376 // is only on the stack if the exception was thrown explicitly via athrow).
377 // During this operation, the expression stack contains the values for the
378 // bci where the exception happened. If the exception was propagated back
379 // from a call, the expression stack contains the values for the bci at the
380 // invoke w/o arguments (i.e., as if one were inside the call).
381 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
382
383 Handle h_exception(thread, exception);
384 methodHandle h_method (thread, method(thread));
385 constantPoolHandle h_constants(thread, h_method->constants());
386 bool should_repeat;
387 int handler_bci;
388 int current_bci = bci(thread);
389
390 if (thread->frames_to_pop_failed_realloc() > 0) {
391 // Allocation of scalar replaced object used in this frame
392 // failed. Unconditionally pop the frame.
393 thread->dec_frames_to_pop_failed_realloc();
394 thread->set_vm_result(h_exception());
395 // If the method is synchronized we already unlocked the monitor
396 // during deoptimization so the interpreter needs to skip it when
397 // the frame is popped.
398 thread->set_do_not_unlock_if_synchronized(true);
399 #ifdef CC_INTERP
400 return (address) -1;
401 #else
402 return Interpreter::remove_activation_entry();
403 #endif
404 }
405
406 // Need to do this check first since when _do_not_unlock_if_synchronized
407 // is set, we don't want to trigger any classloading which may make calls
408 // into java, or surprisingly find a matching exception handler for bci 0
409 // since at this moment the method hasn't been "officially" entered yet.
410 if (thread->do_not_unlock_if_synchronized()) {
411 ResourceMark rm;
412 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
413 thread->set_vm_result(exception);
414 #ifdef CC_INTERP
415 return (address) -1;
416 #else
417 return Interpreter::remove_activation_entry();
418 #endif
419 }
420
421 do {
422 should_repeat = false;
423
424 // assertions
425 #ifdef ASSERT
426 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
427 assert(h_exception->is_oop(), "just checking");
428 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
429 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
430 if (ExitVMOnVerifyError) vm_exit(-1);
431 ShouldNotReachHere();
432 }
433 #endif
434
435 // tracing
436 if (TraceExceptions) {
437 ResourceMark rm(thread);
438 Symbol* message = java_lang_Throwable::detail_message(h_exception());
439 ttyLocker ttyl; // Lock after getting the detail message
440 if (message != NULL) {
441 tty->print_cr("Exception <%s: %s> (" INTPTR_FORMAT ")",
442 h_exception->print_value_string(), message->as_C_string(),
443 (address)h_exception());
444 } else {
445 tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")",
446 h_exception->print_value_string(),
447 (address)h_exception());
448 }
449 tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
450 tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
451 }
452 // Don't go paging in something which won't be used.
453 // else if (extable->length() == 0) {
454 // // disabled for now - interpreter is not using shortcut yet
455 // // (shortcut is not to call runtime if we have no exception handlers)
456 // // warning("performance bug: should not call runtime if method has no exception handlers");
457 // }
458 // for AbortVMOnException flag
459 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
460
461 // exception handler lookup
462 KlassHandle h_klass(THREAD, h_exception->klass());
463 handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD);
464 if (HAS_PENDING_EXCEPTION) {
465 // We threw an exception while trying to find the exception handler.
466 // Transfer the new exception to the exception handle which will
467 // be set into thread local storage, and do another lookup for an
468 // exception handler for this exception, this time starting at the
469 // BCI of the exception handler which caused the exception to be
470 // thrown (bug 4307310).
471 h_exception = Handle(THREAD, PENDING_EXCEPTION);
472 CLEAR_PENDING_EXCEPTION;
473 if (handler_bci >= 0) {
474 current_bci = handler_bci;
475 should_repeat = true;
476 }
477 }
478 } while (should_repeat == true);
479
480 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
481 // time throw or a stack unwinding throw and accordingly notify the debugger
482 if (JvmtiExport::can_post_on_exceptions()) {
483 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
484 }
485
486 #ifdef CC_INTERP
487 address continuation = (address)(intptr_t) handler_bci;
488 #else
489 address continuation = NULL;
490 #endif
491 address handler_pc = NULL;
492 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
493 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
494 // handler in this method, or (b) after a stack overflow there is not yet
495 // enough stack space available to reprotect the stack.
496 #ifndef CC_INTERP
497 continuation = Interpreter::remove_activation_entry();
498 #endif
499 // Count this for compilation purposes
500 h_method->interpreter_throwout_increment(THREAD);
501 } else {
502 // handler in this method => change bci/bcp to handler bci/bcp and continue there
503 handler_pc = h_method->code_base() + handler_bci;
504 #ifndef CC_INTERP
505 set_bcp_and_mdp(handler_pc, thread);
506 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
507 #endif
508 }
509 // notify debugger of an exception catch
510 // (this is good for exceptions caught in native methods as well)
511 if (JvmtiExport::can_post_on_exceptions()) {
512 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
513 }
514
515 thread->set_vm_result(h_exception());
516 return continuation;
517 IRT_END
518
519
520 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
521 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
522 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
523 IRT_END
524
525
526 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
527 THROW(vmSymbols::java_lang_AbstractMethodError());
528 IRT_END
529
530
531 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
532 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
533 IRT_END
534
535
536 //------------------------------------------------------------------------------------------------------------------------
537 // Fields
538 //
539
540 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
541 // resolve field
542 fieldDescriptor info;
543 constantPoolHandle pool(thread, method(thread)->constants());
544 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_putstatic);
545 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
546
547 {
548 JvmtiHideSingleStepping jhss(thread);
549 LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
550 bytecode, CHECK);
551 } // end JvmtiHideSingleStepping
552
553 // check if link resolution caused cpCache to be updated
554 if (already_resolved(thread)) return;
555
556 // compute auxiliary field attributes
557 TosState state = as_TosState(info.field_type());
558
559 // We need to delay resolving put instructions on final fields
560 // until we actually invoke one. This is required so we throw
561 // exceptions at the correct place. If we do not resolve completely
562 // in the current pass, leaving the put_code set to zero will
563 // cause the next put instruction to reresolve.
564 Bytecodes::Code put_code = (Bytecodes::Code)0;
565
566 // We also need to delay resolving getstatic instructions until the
567 // class is intitialized. This is required so that access to the static
568 // field will call the initialization function every time until the class
569 // is completely initialized ala. in 2.17.5 in JVM Specification.
570 InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
571 bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
572 !klass->is_initialized());
573 Bytecodes::Code get_code = (Bytecodes::Code)0;
574
575 if (!uninitialized_static) {
576 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
577 if (is_put || !info.access_flags().is_final()) {
578 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
579 }
580 }
581
582 cache_entry(thread)->set_field(
583 get_code,
584 put_code,
585 info.field_holder(),
586 info.index(),
587 info.offset(),
588 state,
589 info.access_flags().is_final(),
590 info.access_flags().is_volatile(),
591 pool->pool_holder()
592 );
593 IRT_END
594
595
596 //------------------------------------------------------------------------------------------------------------------------
597 // Synchronization
598 //
599 // The interpreter's synchronization code is factored out so that it can
600 // be shared by method invocation and synchronized blocks.
601 //%note synchronization_3
602
603 //%note monitor_1
604 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
605 #ifdef ASSERT
606 thread->last_frame().interpreter_frame_verify_monitor(elem);
607 #endif
608 if (PrintBiasedLockingStatistics) {
609 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
610 }
611 Handle h_obj(thread, elem->obj());
612 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
613 "must be NULL or an object");
614 if (UseBiasedLocking) {
615 // Retry fast entry if bias is revoked to avoid unnecessary inflation
616 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
617 } else {
618 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
619 }
620 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
621 "must be NULL or an object");
622 #ifdef ASSERT
623 thread->last_frame().interpreter_frame_verify_monitor(elem);
624 #endif
625 IRT_END
626
627
628 //%note monitor_1
629 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
630 #ifdef ASSERT
631 thread->last_frame().interpreter_frame_verify_monitor(elem);
632 #endif
633 Handle h_obj(thread, elem->obj());
634 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
635 "must be NULL or an object");
636 if (elem == NULL || h_obj()->is_unlocked()) {
637 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
638 }
639 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
640 // Free entry. This must be done here, since a pending exception might be installed on
641 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
642 elem->set_obj(NULL);
643 #ifdef ASSERT
644 thread->last_frame().interpreter_frame_verify_monitor(elem);
645 #endif
646 IRT_END
647
648
649 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
650 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
651 IRT_END
652
653
654 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
655 // Returns an illegal exception to install into the current thread. The
656 // pending_exception flag is cleared so normal exception handling does not
657 // trigger. Any current installed exception will be overwritten. This
658 // method will be called during an exception unwind.
659
660 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
661 Handle exception(thread, thread->vm_result());
662 assert(exception() != NULL, "vm result should be set");
663 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
664 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
665 exception = get_preinitialized_exception(
666 SystemDictionary::IllegalMonitorStateException_klass(),
667 CATCH);
668 }
669 thread->set_vm_result(exception());
670 IRT_END
671
672
673 //------------------------------------------------------------------------------------------------------------------------
674 // Invokes
675
676 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
677 return method->orig_bytecode_at(method->bci_from(bcp));
678 IRT_END
679
680 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
681 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
682 IRT_END
683
684 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
685 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
686 IRT_END
687
688 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
689 // extract receiver from the outgoing argument list if necessary
690 Handle receiver(thread, NULL);
691 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
692 ResourceMark rm(thread);
693 methodHandle m (thread, method(thread));
694 Bytecode_invoke call(m, bci(thread));
695 Symbol* signature = call.signature();
696 receiver = Handle(thread,
697 thread->last_frame().interpreter_callee_receiver(signature));
698 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
699 "sanity check");
700 assert(receiver.is_null() ||
701 !Universe::heap()->is_in_reserved(receiver->klass()),
702 "sanity check");
703 }
704
705 // resolve method
706 CallInfo info;
707 constantPoolHandle pool(thread, method(thread)->constants());
708
709 {
710 JvmtiHideSingleStepping jhss(thread);
711 LinkResolver::resolve_invoke(info, receiver, pool,
712 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
713 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
714 int retry_count = 0;
715 while (info.resolved_method()->is_old()) {
716 // It is very unlikely that method is redefined more than 100 times
717 // in the middle of resolve. If it is looping here more than 100 times
718 // means then there could be a bug here.
719 guarantee((retry_count++ < 100),
720 "Could not resolve to latest version of redefined method");
721 // method is redefined in the middle of resolve so re-try.
722 LinkResolver::resolve_invoke(info, receiver, pool,
723 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
724 }
725 }
726 } // end JvmtiHideSingleStepping
727
728 // check if link resolution caused cpCache to be updated
729 if (already_resolved(thread)) return;
730
731 if (bytecode == Bytecodes::_invokeinterface) {
732 if (TraceItables && Verbose) {
733 ResourceMark rm(thread);
734 tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
735 }
736 }
737 #ifdef ASSERT
738 if (bytecode == Bytecodes::_invokeinterface) {
739 if (info.resolved_method()->method_holder() ==
740 SystemDictionary::Object_klass()) {
741 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
742 // (see also CallInfo::set_interface for details)
743 assert(info.call_kind() == CallInfo::vtable_call ||
744 info.call_kind() == CallInfo::direct_call, "");
745 methodHandle rm = info.resolved_method();
746 assert(rm->is_final() || info.has_vtable_index(),
747 "should have been set already");
748 } else if (!info.resolved_method()->has_itable_index()) {
749 // Resolved something like CharSequence.toString. Use vtable not itable.
750 assert(info.call_kind() != CallInfo::itable_call, "");
751 } else {
752 // Setup itable entry
753 assert(info.call_kind() == CallInfo::itable_call, "");
754 int index = info.resolved_method()->itable_index();
755 assert(info.itable_index() == index, "");
756 }
757 } else {
758 assert(info.call_kind() == CallInfo::direct_call ||
759 info.call_kind() == CallInfo::vtable_call, "");
760 }
761 #endif
762 switch (info.call_kind()) {
763 case CallInfo::direct_call:
764 cache_entry(thread)->set_direct_call(
765 bytecode,
766 info.resolved_method());
767 break;
768 case CallInfo::vtable_call:
769 cache_entry(thread)->set_vtable_call(
770 bytecode,
771 info.resolved_method(),
772 info.vtable_index());
773 break;
774 case CallInfo::itable_call:
775 cache_entry(thread)->set_itable_call(
776 bytecode,
777 info.resolved_method(),
778 info.itable_index());
779 break;
780 default: ShouldNotReachHere();
781 }
782 }
783 IRT_END
784
785
786 // First time execution: Resolve symbols, create a permanent MethodType object.
787 IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) {
788 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
789
790 // resolve method
791 CallInfo info;
792 constantPoolHandle pool(thread, method(thread)->constants());
793
794 {
795 JvmtiHideSingleStepping jhss(thread);
796 LinkResolver::resolve_invoke(info, Handle(), pool,
797 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
798 } // end JvmtiHideSingleStepping
799
800 cache_entry(thread)->set_method_handle(pool, info);
801 }
802 IRT_END
803
804
805 // First time execution: Resolve symbols, create a permanent CallSite object.
806 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
807 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
808
809 //TO DO: consider passing BCI to Java.
810 // int caller_bci = method(thread)->bci_from(bcp(thread));
811
812 // resolve method
813 CallInfo info;
814 constantPoolHandle pool(thread, method(thread)->constants());
815 int index = get_index_u4(thread, bytecode);
816 {
817 JvmtiHideSingleStepping jhss(thread);
818 LinkResolver::resolve_invoke(info, Handle(), pool,
819 index, bytecode, CHECK);
820 } // end JvmtiHideSingleStepping
821
822 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
823 cp_cache_entry->set_dynamic_call(pool, info);
824 }
825 IRT_END
826
827
828 //------------------------------------------------------------------------------------------------------------------------
829 // Miscellaneous
830
831
832 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
833 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
834 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
835 if (branch_bcp != NULL && nm != NULL) {
836 // This was a successful request for an OSR nmethod. Because
837 // frequency_counter_overflow_inner ends with a safepoint check,
838 // nm could have been unloaded so look it up again. It's unsafe
839 // to examine nm directly since it might have been freed and used
840 // for something else.
841 frame fr = thread->last_frame();
842 Method* method = fr.interpreter_frame_method();
843 int bci = method->bci_from(fr.interpreter_frame_bcp());
844 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
845 }
846 #ifndef PRODUCT
847 if (TraceOnStackReplacement) {
848 if (nm != NULL) {
849 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry());
850 nm->print();
851 }
852 }
853 #endif
854 return nm;
855 }
856
857 IRT_ENTRY(nmethod*,
858 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
859 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
860 // flag, in case this method triggers classloading which will call into Java.
861 UnlockFlagSaver fs(thread);
862
863 frame fr = thread->last_frame();
864 assert(fr.is_interpreted_frame(), "must come from interpreter");
865 methodHandle method(thread, fr.interpreter_frame_method());
866 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
867 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
868
869 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
870 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
871 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
872
873 if (osr_nm != NULL) {
874 // We may need to do on-stack replacement which requires that no
875 // monitors in the activation are biased because their
876 // BasicObjectLocks will need to migrate during OSR. Force
877 // unbiasing of all monitors in the activation now (even though
878 // the OSR nmethod might be invalidated) because we don't have a
879 // safepoint opportunity later once the migration begins.
880 if (UseBiasedLocking) {
881 ResourceMark rm;
882 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
883 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
884 kptr < fr.interpreter_frame_monitor_begin();
885 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
886 if( kptr->obj() != NULL ) {
887 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
888 }
889 }
890 BiasedLocking::revoke(objects_to_revoke);
891 }
892 }
893 return osr_nm;
894 IRT_END
895
896 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
897 assert(ProfileInterpreter, "must be profiling interpreter");
898 int bci = method->bci_from(cur_bcp);
899 MethodData* mdo = method->method_data();
900 if (mdo == NULL) return 0;
901 return mdo->bci_to_di(bci);
902 IRT_END
903
904 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
905 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
906 // flag, in case this method triggers classloading which will call into Java.
907 UnlockFlagSaver fs(thread);
908
909 assert(ProfileInterpreter, "must be profiling interpreter");
910 frame fr = thread->last_frame();
911 assert(fr.is_interpreted_frame(), "must come from interpreter");
912 methodHandle method(thread, fr.interpreter_frame_method());
913 Method::build_interpreter_method_data(method, THREAD);
914 if (HAS_PENDING_EXCEPTION) {
915 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
916 CLEAR_PENDING_EXCEPTION;
917 // and fall through...
918 }
919 IRT_END
920
921
922 #ifdef ASSERT
923 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
924 assert(ProfileInterpreter, "must be profiling interpreter");
925
926 MethodData* mdo = method->method_data();
927 assert(mdo != NULL, "must not be null");
928
929 int bci = method->bci_from(bcp);
930
931 address mdp2 = mdo->bci_to_dp(bci);
932 if (mdp != mdp2) {
933 ResourceMark rm;
934 ResetNoHandleMark rnm; // In a LEAF entry.
935 HandleMark hm;
936 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
937 int current_di = mdo->dp_to_di(mdp);
938 int expected_di = mdo->dp_to_di(mdp2);
939 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
940 int expected_approx_bci = mdo->data_at(expected_di)->bci();
941 int approx_bci = -1;
942 if (current_di >= 0) {
943 approx_bci = mdo->data_at(current_di)->bci();
944 }
945 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
946 mdo->print_on(tty);
947 method->print_codes();
948 }
949 assert(mdp == mdp2, "wrong mdp");
950 IRT_END
951 #endif // ASSERT
952
953 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
954 assert(ProfileInterpreter, "must be profiling interpreter");
955 ResourceMark rm(thread);
956 HandleMark hm(thread);
957 frame fr = thread->last_frame();
958 assert(fr.is_interpreted_frame(), "must come from interpreter");
959 MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
960
961 // Grab a lock to ensure atomic access to setting the return bci and
962 // the displacement. This can block and GC, invalidating all naked oops.
963 MutexLocker ml(RetData_lock);
964
965 // ProfileData is essentially a wrapper around a derived oop, so we
966 // need to take the lock before making any ProfileData structures.
967 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
968 RetData* rdata = data->as_RetData();
969 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
970 fr.interpreter_frame_set_mdp(new_mdp);
971 IRT_END
972
973 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
974 MethodCounters* mcs = Method::build_method_counters(m, thread);
975 if (HAS_PENDING_EXCEPTION) {
976 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
977 CLEAR_PENDING_EXCEPTION;
978 }
979 return mcs;
980 IRT_END
981
982
983 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
984 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
985 // stack traversal automatically takes care of preserving arguments for invoke, so
986 // this is no longer needed.
987
988 // IRT_END does an implicit safepoint check, hence we are guaranteed to block
989 // if this is called during a safepoint
990
991 if (JvmtiExport::should_post_single_step()) {
992 // We are called during regular safepoints and when the VM is
993 // single stepping. If any thread is marked for single stepping,
994 // then we may have JVMTI work to do.
995 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
996 }
997 IRT_END
998
999 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1000 ConstantPoolCacheEntry *cp_entry))
1001
1002 // check the access_flags for the field in the klass
1003
1004 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1005 int index = cp_entry->field_index();
1006 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) 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, (Klass*)cp_entry->f1_as_klass());
1017 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), 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 Klass* k = (Klass*)cp_entry->f1_as_klass();
1025
1026 // check the access_flags for the field in the klass
1027 InstanceKlass* ik = InstanceKlass::cast(k);
1028 int index = cp_entry->field_index();
1029 // bail out if field modifications are not watched
1030 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1031
1032 char sig_type = '\0';
1033
1034 switch(cp_entry->flag_state()) {
1035 case btos: sig_type = 'Z'; break;
1036 case ctos: sig_type = 'C'; break;
1037 case stos: sig_type = 'S'; break;
1038 case itos: sig_type = 'I'; break;
1039 case ftos: sig_type = 'F'; break;
1040 case atos: sig_type = 'L'; break;
1041 case ltos: sig_type = 'J'; break;
1042 case dtos: sig_type = 'D'; break;
1043 default: ShouldNotReachHere(); return;
1044 }
1045 bool is_static = (obj == NULL);
1046
1047 HandleMark hm(thread);
1048 instanceKlassHandle h_klass(thread, k);
1049 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static);
1050 jvalue fvalue;
1051 #ifdef _LP64
1052 fvalue = *value;
1053 #else
1054 // Long/double values are stored unaligned and also noncontiguously with
1055 // tagged stacks. We can't just do a simple assignment even in the non-
1056 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1057 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1058 // We assume that the two halves of longs/doubles are stored in interpreter
1059 // stack slots in platform-endian order.
1060 jlong_accessor u;
1061 jint* newval = (jint*)value;
1062 u.words[0] = newval[0];
1063 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1064 fvalue.j = u.long_value;
1065 #endif // _LP64
1066
1067 Handle h_obj;
1068 if (!is_static) {
1069 // non-static field accessors have an object, but we need a handle
1070 h_obj = Handle(thread, obj);
1071 }
1072
1073 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1074 fid, sig_type, &fvalue);
1075 IRT_END
1076
1077 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1078 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1079 IRT_END
1080
1081
1082 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1083 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1084 IRT_END
1085
1086 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1087 {
1088 return (Interpreter::contains(pc) ? 1 : 0);
1089 }
1090 IRT_END
1091
1092
1093 // Implementation of SignatureHandlerLibrary
1094
1095 address SignatureHandlerLibrary::set_handler_blob() {
1096 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1097 if (handler_blob == NULL) {
1098 return NULL;
1099 }
1100 address handler = handler_blob->code_begin();
1101 _handler_blob = handler_blob;
1102 _handler = handler;
1103 return handler;
1104 }
1105
1106 void SignatureHandlerLibrary::initialize() {
1107 if (_fingerprints != NULL) {
1108 return;
1109 }
1110 if (set_handler_blob() == NULL) {
1111 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1112 }
1113
1114 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1115 SignatureHandlerLibrary::buffer_size);
1116 _buffer = bb->code_begin();
1117
1118 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1119 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1120 }
1121
1122 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1123 address handler = _handler;
1124 int insts_size = buffer->pure_insts_size();
1125 if (handler + insts_size > _handler_blob->code_end()) {
1126 // get a new handler blob
1127 handler = set_handler_blob();
1128 }
1129 if (handler != NULL) {
1130 memcpy(handler, buffer->insts_begin(), insts_size);
1131 pd_set_handler(handler);
1132 ICache::invalidate_range(handler, insts_size);
1133 _handler = handler + insts_size;
1134 }
1135 return handler;
1136 }
1137
1138 void SignatureHandlerLibrary::add(methodHandle method) {
1139 if (method->signature_handler() == NULL) {
1140 // use slow signature handler if we can't do better
1141 int handler_index = -1;
1142 // check if we can use customized (fast) signature handler
1143 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1144 // use customized signature handler
1145 MutexLocker mu(SignatureHandlerLibrary_lock);
1146 // make sure data structure is initialized
1147 initialize();
1148 // lookup method signature's fingerprint
1149 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1150 handler_index = _fingerprints->find(fingerprint);
1151 // create handler if necessary
1152 if (handler_index < 0) {
1153 ResourceMark rm;
1154 ptrdiff_t align_offset = (address)
1155 round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1156 CodeBuffer buffer((address)(_buffer + align_offset),
1157 SignatureHandlerLibrary::buffer_size - align_offset);
1158 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1159 // copy into code heap
1160 address handler = set_handler(&buffer);
1161 if (handler == NULL) {
1162 // use slow signature handler
1163 } else {
1164 // debugging suppport
1165 if (PrintSignatureHandlers) {
1166 tty->cr();
1167 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1168 _handlers->length(),
1169 (method->is_static() ? "static" : "receiver"),
1170 method->name_and_sig_as_C_string(),
1171 fingerprint,
1172 buffer.insts_size());
1173 Disassembler::decode(handler, handler + buffer.insts_size());
1174 #ifndef PRODUCT
1175 tty->print_cr(" --- associated result handler ---");
1176 address rh_begin = Interpreter::result_handler(method()->result_type());
1177 address rh_end = rh_begin;
1178 while (*(int*)rh_end != 0) {
1179 rh_end += sizeof(int);
1180 }
1181 Disassembler::decode(rh_begin, rh_end);
1182 #endif
1183 }
1184 // add handler to library
1185 _fingerprints->append(fingerprint);
1186 _handlers->append(handler);
1187 // set handler index
1188 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1189 handler_index = _fingerprints->length() - 1;
1190 }
1191 }
1192 // Set handler under SignatureHandlerLibrary_lock
1193 if (handler_index < 0) {
1194 // use generic signature handler
1195 method->set_signature_handler(Interpreter::slow_signature_handler());
1196 } else {
1197 // set handler
1198 method->set_signature_handler(_handlers->at(handler_index));
1199 }
1200 } else {
1201 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1202 // use generic signature handler
1203 method->set_signature_handler(Interpreter::slow_signature_handler());
1204 }
1205 }
1206 #ifdef ASSERT
1207 int handler_index = -1;
1208 int fingerprint_index = -2;
1209 {
1210 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1211 // in any way if accessed from multiple threads. To avoid races with another
1212 // thread which may change the arrays in the above, mutex protected block, we
1213 // have to protect this read access here with the same mutex as well!
1214 MutexLocker mu(SignatureHandlerLibrary_lock);
1215 if (_handlers != NULL) {
1216 handler_index = _handlers->find(method->signature_handler());
1217 fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());
1218 }
1219 }
1220 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1221 handler_index == fingerprint_index, "sanity check");
1222 #endif // ASSERT
1223 }
1224
1225
1226 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1227 address SignatureHandlerLibrary::_handler = NULL;
1228 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1229 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1230 address SignatureHandlerLibrary::_buffer = NULL;
1231
1232
1233 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1234 methodHandle m(thread, method);
1235 assert(m->is_native(), "sanity check");
1236 // lookup native function entry point if it doesn't exist
1237 bool in_base_library;
1238 if (!m->has_native_function()) {
1239 NativeLookup::lookup(m, in_base_library, CHECK);
1240 }
1241 // make sure signature handler is installed
1242 SignatureHandlerLibrary::add(m);
1243 // The interpreter entry point checks the signature handler first,
1244 // before trying to fetch the native entry point and klass mirror.
1245 // We must set the signature handler last, so that multiple processors
1246 // preparing the same method will be sure to see non-null entry & mirror.
1247 IRT_END
1248
1249 #if defined(IA32) || defined(AMD64) || defined(ARM)
1250 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1251 if (src_address == dest_address) {
1252 return;
1253 }
1254 ResetNoHandleMark rnm; // In a LEAF entry.
1255 HandleMark hm;
1256 ResourceMark rm;
1257 frame fr = thread->last_frame();
1258 assert(fr.is_interpreted_frame(), "");
1259 jint bci = fr.interpreter_frame_bci();
1260 methodHandle mh(thread, fr.interpreter_frame_method());
1261 Bytecode_invoke invoke(mh, bci);
1262 ArgumentSizeComputer asc(invoke.signature());
1263 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1264 Copy::conjoint_jbytes(src_address, dest_address,
1265 size_of_arguments * Interpreter::stackElementSize);
1266 IRT_END
1267 #endif
1268
1269 #if INCLUDE_JVMTI
1270 // This is a support of the JVMTI PopFrame interface.
1271 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1272 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1273 // The member_name argument is a saved reference (in local#0) to the member_name.
1274 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1275 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1276 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1277 Method* method, address bcp))
1278 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1279 if (code != Bytecodes::_invokestatic) {
1280 return;
1281 }
1282 ConstantPool* cpool = method->constants();
1283 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1284 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1285 Symbol* mname = cpool->name_ref_at(cp_index);
1286
1287 if (MethodHandles::has_member_arg(cname, mname)) {
1288 oop member_name_oop = (oop) member_name;
1289 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1290 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1291 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1292 }
1293 thread->set_vm_result(member_name_oop);
1294 }
1295 IRT_END
1296 #endif // INCLUDE_JVMTI