1 /*
2 * Copyright (c) 1997, 2014, 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/atomic.inline.hpp"
46 #include "runtime/biasedLocking.hpp"
47 #include "runtime/compilationPolicy.hpp"
48 #include "runtime/deoptimization.hpp"
49 #include "runtime/fieldDescriptor.hpp"
50 #include "runtime/handles.inline.hpp"
51 #include "runtime/icache.hpp"
52 #include "runtime/interfaceSupport.hpp"
53 #include "runtime/java.hpp"
54 #include "runtime/jfieldIDWorkaround.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/synchronizer.hpp"
59 #include "runtime/threadCritical.hpp"
60 #include "utilities/events.hpp"
61 #ifdef COMPILER2
62 #include "opto/runtime.hpp"
63 #endif
64
65 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
66
67 class UnlockFlagSaver {
68 private:
69 JavaThread* _thread;
70 bool _do_not_unlock;
71 public:
72 UnlockFlagSaver(JavaThread* t) {
73 _thread = t;
74 _do_not_unlock = t->do_not_unlock_if_synchronized();
75 t->set_do_not_unlock_if_synchronized(false);
76 }
77 ~UnlockFlagSaver() {
78 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
79 }
80 };
81
82 //------------------------------------------------------------------------------------------------------------------------
83 // State accessors
84
85 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
86 last_frame(thread).interpreter_frame_set_bcp(bcp);
87 if (ProfileInterpreter) {
88 // ProfileTraps uses MDOs independently of ProfileInterpreter.
89 // That is why we must check both ProfileInterpreter and mdo != NULL.
90 MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
91 if (mdo != NULL) {
92 NEEDS_CLEANUP;
93 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
94 }
95 }
96 }
97
98 //------------------------------------------------------------------------------------------------------------------------
99 // Constants
100
101
102 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
103 // access constant pool
104 ConstantPool* pool = method(thread)->constants();
105 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
106 constantTag tag = pool->tag_at(index);
107
108 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
109 Klass* klass = pool->klass_at(index, CHECK);
110 oop java_class = klass->java_mirror();
111 thread->set_vm_result(java_class);
112 IRT_END
113
114 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
115 assert(bytecode == Bytecodes::_fast_aldc ||
116 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
117 ResourceMark rm(thread);
118 methodHandle m (thread, method(thread));
119 Bytecode_loadconstant ldc(m, bci(thread));
120 oop result = ldc.resolve_constant(CHECK);
121 #ifdef ASSERT
122 {
123 // The bytecode wrappers aren't GC-safe so construct a new one
124 Bytecode_loadconstant ldc2(m, bci(thread));
125 oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
126 assert(result == coop, "expected result for assembly code");
127 }
128 #endif
129 thread->set_vm_result(result);
130 }
131 IRT_END
132
133
134 //------------------------------------------------------------------------------------------------------------------------
135 // Allocation
136
137 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
138 Klass* k_oop = pool->klass_at(index, CHECK);
139 instanceKlassHandle klass (THREAD, k_oop);
140
141 // Make sure we are not instantiating an abstract klass
142 klass->check_valid_for_instantiation(true, CHECK);
143
144 // Make sure klass is initialized
145 klass->initialize(CHECK);
146
147 // At this point the class may not be fully initialized
148 // because of recursive initialization. If it is fully
149 // initialized & has_finalized is not set, we rewrite
150 // it into its fast version (Note: no locking is needed
151 // here since this is an atomic byte write and can be
152 // done more than once).
153 //
154 // Note: In case of classes with has_finalized we don't
155 // rewrite since that saves us an extra check in
156 // the fast version which then would call the
157 // slow version anyway (and do a call back into
158 // Java).
159 // If we have a breakpoint, then we don't rewrite
160 // because the _breakpoint bytecode would be lost.
161 oop obj = klass->allocate_instance(CHECK);
162 thread->set_vm_result(obj);
163 IRT_END
164
165
166 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
167 oop obj = oopFactory::new_typeArray(type, size, CHECK);
168 thread->set_vm_result(obj);
169 IRT_END
170
171
172 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
173 // Note: no oopHandle for pool & klass needed since they are not used
174 // anymore after new_objArray() and no GC can happen before.
175 // (This may have to change if this code changes!)
176 Klass* klass = pool->klass_at(index, CHECK);
177 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
178 thread->set_vm_result(obj);
179 IRT_END
180
181
182 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
183 // We may want to pass in more arguments - could make this slightly faster
184 ConstantPool* constants = method(thread)->constants();
185 int i = get_index_u2(thread, Bytecodes::_multianewarray);
186 Klass* klass = constants->klass_at(i, CHECK);
187 int nof_dims = number_of_dimensions(thread);
188 assert(klass->is_klass(), "not a class");
189 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
190
191 // We must create an array of jints to pass to multi_allocate.
192 ResourceMark rm(thread);
193 const int small_dims = 10;
194 jint dim_array[small_dims];
195 jint *dims = &dim_array[0];
196 if (nof_dims > small_dims) {
197 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
198 }
199 for (int index = 0; index < nof_dims; index++) {
200 // offset from first_size_address is addressed as local[index]
201 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
202 dims[index] = first_size_address[n];
203 }
204 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
205 thread->set_vm_result(obj);
206 IRT_END
207
208
209 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
210 assert(obj->is_oop(), "must be a valid oop");
211 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
212 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
213 IRT_END
214
215
216 // Quicken instance-of and check-cast bytecodes
217 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
218 // Force resolving; quicken the bytecode
219 int which = get_index_u2(thread, Bytecodes::_checkcast);
220 ConstantPool* cpool = method(thread)->constants();
221 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
222 // program we might have seen an unquick'd bytecode in the interpreter but have another
223 // thread quicken the bytecode before we get here.
224 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
225 Klass* klass = cpool->klass_at(which, CHECK);
226 thread->set_vm_result_2(klass);
227 IRT_END
228
229
230 //------------------------------------------------------------------------------------------------------------------------
231 // Exceptions
232
233 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
234 methodHandle trap_method, int trap_bci, TRAPS) {
235 if (trap_method.not_null()) {
236 MethodData* trap_mdo = trap_method->method_data();
237 if (trap_mdo == NULL) {
238 Method::build_interpreter_method_data(trap_method, THREAD);
239 if (HAS_PENDING_EXCEPTION) {
240 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
241 "we expect only an OOM error here");
242 CLEAR_PENDING_EXCEPTION;
243 }
244 trap_mdo = trap_method->method_data();
245 // and fall through...
246 }
247 if (trap_mdo != NULL) {
248 // Update per-method count of trap events. The interpreter
249 // is updating the MDO to simulate the effect of compiler traps.
250 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
251 }
252 }
253 }
254
255 // Assume the compiler is (or will be) interested in this event.
256 // If necessary, create an MDO to hold the information, and record it.
257 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
258 assert(ProfileTraps, "call me only if profiling");
259 methodHandle trap_method(thread, method(thread));
260 int trap_bci = trap_method->bci_from(bcp(thread));
261 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
262 }
263
264 #ifdef CC_INTERP
265 // As legacy note_trap, but we have more arguments.
266 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
267 methodHandle trap_method(method);
268 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
269 IRT_END
270
271 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
272 // for each exception.
273 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
274 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
275 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
276 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
277 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
278 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
279 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
280 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
281 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
282 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
283 #endif // CC_INTERP
284
285
286 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
287 // get klass
288 InstanceKlass* klass = InstanceKlass::cast(k);
289 assert(klass->is_initialized(),
290 "this klass should have been initialized during VM initialization");
291 // create instance - do not call constructor since we may have no
292 // (java) stack space left (should assert constructor is empty)
293 Handle exception;
294 oop exception_oop = klass->allocate_instance(CHECK_(exception));
295 exception = Handle(THREAD, exception_oop);
296 if (StackTraceInThrowable) {
297 java_lang_Throwable::fill_in_stack_trace(exception);
298 }
299 return exception;
300 }
301
302 // Special handling for stack overflow: since we don't have any (java) stack
303 // space left we use the pre-allocated & pre-initialized StackOverflowError
304 // klass to create an stack overflow error instance. We do not call its
305 // constructor for the same reason (it is empty, anyway).
306 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
307 Handle exception = get_preinitialized_exception(
308 SystemDictionary::StackOverflowError_klass(),
309 CHECK);
310 THROW_HANDLE(exception);
311 IRT_END
312
313
314 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
315 // lookup exception klass
316 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
317 if (ProfileTraps) {
318 if (s == vmSymbols::java_lang_ArithmeticException()) {
319 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
320 } else if (s == vmSymbols::java_lang_NullPointerException()) {
321 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
322 }
323 }
324 // create exception
325 Handle exception = Exceptions::new_exception(thread, s, message);
326 thread->set_vm_result(exception());
327 IRT_END
328
329
330 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
331 ResourceMark rm(thread);
332 const char* klass_name = obj->klass()->external_name();
333 // lookup exception klass
334 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
335 if (ProfileTraps) {
336 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
337 }
338 // create exception, with klass name as detail message
339 Handle exception = Exceptions::new_exception(thread, s, klass_name);
340 thread->set_vm_result(exception());
341 IRT_END
342
343
344 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
345 char message[jintAsStringSize];
346 // lookup exception klass
347 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
348 if (ProfileTraps) {
349 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
350 }
351 // create exception
352 sprintf(message, "%d", index);
353 THROW_MSG(s, message);
354 IRT_END
355
356 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
357 JavaThread* thread, oopDesc* obj))
358
359 ResourceMark rm(thread);
360 char* message = SharedRuntime::generate_class_cast_message(
361 thread, obj->klass()->external_name());
362
363 if (ProfileTraps) {
364 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
365 }
366
367 // create exception
368 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
369 IRT_END
370
371 // exception_handler_for_exception(...) returns the continuation address,
372 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
373 // The exception oop is returned to make sure it is preserved over GC (it
374 // is only on the stack if the exception was thrown explicitly via athrow).
375 // During this operation, the expression stack contains the values for the
376 // bci where the exception happened. If the exception was propagated back
377 // from a call, the expression stack contains the values for the bci at the
378 // invoke w/o arguments (i.e., as if one were inside the call).
379 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
380
381 Handle h_exception(thread, exception);
382 methodHandle h_method (thread, method(thread));
383 constantPoolHandle h_constants(thread, h_method->constants());
384 bool should_repeat;
385 int handler_bci;
386 int current_bci = bci(thread);
387
388 if (thread->frames_to_pop_failed_realloc() > 0) {
389 // Allocation of scalar replaced object used in this frame
390 // failed. Unconditionally pop the frame.
391 thread->dec_frames_to_pop_failed_realloc();
392 thread->set_vm_result(h_exception());
393 // If the method is synchronized we already unlocked the monitor
394 // during deoptimization so the interpreter needs to skip it when
395 // the frame is popped.
396 thread->set_do_not_unlock_if_synchronized(true);
397 return Interpreter::remove_activation_entry();
398 }
399
400 // Need to do this check first since when _do_not_unlock_if_synchronized
401 // is set, we don't want to trigger any classloading which may make calls
402 // into java, or surprisingly find a matching exception handler for bci 0
403 // since at this moment the method hasn't been "officially" entered yet.
404 if (thread->do_not_unlock_if_synchronized()) {
405 ResourceMark rm;
406 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
407 thread->set_vm_result(exception);
408 #ifdef CC_INTERP
409 return (address) -1;
410 #else
411 return Interpreter::remove_activation_entry();
412 #endif
413 }
414
415 do {
416 should_repeat = false;
417
418 // assertions
419 #ifdef ASSERT
420 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
421 assert(h_exception->is_oop(), "just checking");
422 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
423 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
424 if (ExitVMOnVerifyError) vm_exit(-1);
425 ShouldNotReachHere();
426 }
427 #endif
428
429 // tracing
430 if (TraceExceptions) {
431 ResourceMark rm(thread);
432 Symbol* message = java_lang_Throwable::detail_message(h_exception());
433 ttyLocker ttyl; // Lock after getting the detail message
434 if (message != NULL) {
435 tty->print_cr("Exception <%s: %s> (" INTPTR_FORMAT ")",
436 h_exception->print_value_string(), message->as_C_string(),
437 (address)h_exception());
438 } else {
439 tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")",
440 h_exception->print_value_string(),
441 (address)h_exception());
442 }
443 tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
444 tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
445 }
446 // Don't go paging in something which won't be used.
447 // else if (extable->length() == 0) {
448 // // disabled for now - interpreter is not using shortcut yet
449 // // (shortcut is not to call runtime if we have no exception handlers)
450 // // warning("performance bug: should not call runtime if method has no exception handlers");
451 // }
452 // for AbortVMOnException flag
453 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
454
455 // exception handler lookup
456 KlassHandle h_klass(THREAD, h_exception->klass());
457 handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD);
458 if (HAS_PENDING_EXCEPTION) {
459 // We threw an exception while trying to find the exception handler.
460 // Transfer the new exception to the exception handle which will
461 // be set into thread local storage, and do another lookup for an
462 // exception handler for this exception, this time starting at the
463 // BCI of the exception handler which caused the exception to be
464 // thrown (bug 4307310).
465 h_exception = Handle(THREAD, PENDING_EXCEPTION);
466 CLEAR_PENDING_EXCEPTION;
467 if (handler_bci >= 0) {
468 current_bci = handler_bci;
469 should_repeat = true;
470 }
471 }
472 } while (should_repeat == true);
473
474 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
475 // time throw or a stack unwinding throw and accordingly notify the debugger
476 if (JvmtiExport::can_post_on_exceptions()) {
477 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
478 }
479
480 #ifdef CC_INTERP
481 address continuation = (address)(intptr_t) handler_bci;
482 #else
483 address continuation = NULL;
484 #endif
485 address handler_pc = NULL;
486 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
487 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
488 // handler in this method, or (b) after a stack overflow there is not yet
489 // enough stack space available to reprotect the stack.
490 #ifndef CC_INTERP
491 continuation = Interpreter::remove_activation_entry();
492 #endif
493 // Count this for compilation purposes
494 h_method->interpreter_throwout_increment(THREAD);
495 } else {
496 // handler in this method => change bci/bcp to handler bci/bcp and continue there
497 handler_pc = h_method->code_base() + handler_bci;
498 #ifndef CC_INTERP
499 set_bcp_and_mdp(handler_pc, thread);
500 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
501 #endif
502 }
503 // notify debugger of an exception catch
504 // (this is good for exceptions caught in native methods as well)
505 if (JvmtiExport::can_post_on_exceptions()) {
506 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
507 }
508
509 thread->set_vm_result(h_exception());
510 return continuation;
511 IRT_END
512
513
514 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
515 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
516 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
517 IRT_END
518
519
520 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
521 THROW(vmSymbols::java_lang_AbstractMethodError());
522 IRT_END
523
524
525 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
526 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
527 IRT_END
528
529
530 //------------------------------------------------------------------------------------------------------------------------
531 // Fields
532 //
533
534 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
535 // resolve field
536 fieldDescriptor info;
537 constantPoolHandle pool(thread, method(thread)->constants());
538 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_putstatic);
539 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
540
541 {
542 JvmtiHideSingleStepping jhss(thread);
543 LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
544 bytecode, CHECK);
545 } // end JvmtiHideSingleStepping
546
547 // check if link resolution caused cpCache to be updated
548 if (already_resolved(thread)) return;
549
550 // compute auxiliary field attributes
551 TosState state = as_TosState(info.field_type());
552
553 // We need to delay resolving put instructions on final fields
554 // until we actually invoke one. This is required so we throw
555 // exceptions at the correct place. If we do not resolve completely
556 // in the current pass, leaving the put_code set to zero will
557 // cause the next put instruction to reresolve.
558 Bytecodes::Code put_code = (Bytecodes::Code)0;
559
560 // We also need to delay resolving getstatic instructions until the
561 // class is intitialized. This is required so that access to the static
562 // field will call the initialization function every time until the class
563 // is completely initialized ala. in 2.17.5 in JVM Specification.
564 InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
565 bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
566 !klass->is_initialized());
567 Bytecodes::Code get_code = (Bytecodes::Code)0;
568
569 if (!uninitialized_static) {
570 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
571 if (is_put || !info.access_flags().is_final()) {
572 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
573 }
574 }
575
576 cache_entry(thread)->set_field(
577 get_code,
578 put_code,
579 info.field_holder(),
580 info.index(),
581 info.offset(),
582 state,
583 info.access_flags().is_final(),
584 info.access_flags().is_volatile(),
585 pool->pool_holder()
586 );
587 IRT_END
588
589
590 //------------------------------------------------------------------------------------------------------------------------
591 // Synchronization
592 //
593 // The interpreter's synchronization code is factored out so that it can
594 // be shared by method invocation and synchronized blocks.
595 //%note synchronization_3
596
597 //%note monitor_1
598 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
599 #ifdef ASSERT
600 thread->last_frame().interpreter_frame_verify_monitor(elem);
601 #endif
602 if (PrintBiasedLockingStatistics) {
603 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
604 }
605 Handle h_obj(thread, elem->obj());
606 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
607 "must be NULL or an object");
608 if (UseBiasedLocking) {
609 // Retry fast entry if bias is revoked to avoid unnecessary inflation
610 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
611 } else {
612 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
613 }
614 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
615 "must be NULL or an object");
616 #ifdef ASSERT
617 thread->last_frame().interpreter_frame_verify_monitor(elem);
618 #endif
619 IRT_END
620
621
622 //%note monitor_1
623 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
624 #ifdef ASSERT
625 thread->last_frame().interpreter_frame_verify_monitor(elem);
626 #endif
627 Handle h_obj(thread, elem->obj());
628 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
629 "must be NULL or an object");
630 if (elem == NULL || h_obj()->is_unlocked()) {
631 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
632 }
633 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
634 // Free entry. This must be done here, since a pending exception might be installed on
635 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
636 elem->set_obj(NULL);
637 #ifdef ASSERT
638 thread->last_frame().interpreter_frame_verify_monitor(elem);
639 #endif
640 IRT_END
641
642
643 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
644 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
645 IRT_END
646
647
648 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
649 // Returns an illegal exception to install into the current thread. The
650 // pending_exception flag is cleared so normal exception handling does not
651 // trigger. Any current installed exception will be overwritten. This
652 // method will be called during an exception unwind.
653
654 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
655 Handle exception(thread, thread->vm_result());
656 assert(exception() != NULL, "vm result should be set");
657 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
658 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
659 exception = get_preinitialized_exception(
660 SystemDictionary::IllegalMonitorStateException_klass(),
661 CATCH);
662 }
663 thread->set_vm_result(exception());
664 IRT_END
665
666
667 //------------------------------------------------------------------------------------------------------------------------
668 // Invokes
669
670 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
671 return method->orig_bytecode_at(method->bci_from(bcp));
672 IRT_END
673
674 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
675 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
676 IRT_END
677
678 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
679 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
680 IRT_END
681
682 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
683 // extract receiver from the outgoing argument list if necessary
684 Handle receiver(thread, NULL);
685 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
686 ResourceMark rm(thread);
687 methodHandle m (thread, method(thread));
688 Bytecode_invoke call(m, bci(thread));
689 Symbol* signature = call.signature();
690 receiver = Handle(thread,
691 thread->last_frame().interpreter_callee_receiver(signature));
692 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
693 "sanity check");
694 assert(receiver.is_null() ||
695 !Universe::heap()->is_in_reserved(receiver->klass()),
696 "sanity check");
697 }
698
699 // resolve method
700 CallInfo info;
701 constantPoolHandle pool(thread, method(thread)->constants());
702
703 {
704 JvmtiHideSingleStepping jhss(thread);
705 LinkResolver::resolve_invoke(info, receiver, pool,
706 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
707 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
708 int retry_count = 0;
709 while (info.resolved_method()->is_old()) {
710 // It is very unlikely that method is redefined more than 100 times
711 // in the middle of resolve. If it is looping here more than 100 times
712 // means then there could be a bug here.
713 guarantee((retry_count++ < 100),
714 "Could not resolve to latest version of redefined method");
715 // method is redefined in the middle of resolve so re-try.
716 LinkResolver::resolve_invoke(info, receiver, pool,
717 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
718 }
719 }
720 } // end JvmtiHideSingleStepping
721
722 // check if link resolution caused cpCache to be updated
723 if (already_resolved(thread)) return;
724
725 if (bytecode == Bytecodes::_invokeinterface) {
726 if (TraceItables && Verbose) {
727 ResourceMark rm(thread);
728 tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
729 }
730 }
731 #ifdef ASSERT
732 if (bytecode == Bytecodes::_invokeinterface) {
733 if (info.resolved_method()->method_holder() ==
734 SystemDictionary::Object_klass()) {
735 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
736 // (see also CallInfo::set_interface for details)
737 assert(info.call_kind() == CallInfo::vtable_call ||
738 info.call_kind() == CallInfo::direct_call, "");
739 methodHandle rm = info.resolved_method();
740 assert(rm->is_final() || info.has_vtable_index(),
741 "should have been set already");
742 } else if (!info.resolved_method()->has_itable_index()) {
743 // Resolved something like CharSequence.toString. Use vtable not itable.
744 assert(info.call_kind() != CallInfo::itable_call, "");
745 } else {
746 // Setup itable entry
747 assert(info.call_kind() == CallInfo::itable_call, "");
748 int index = info.resolved_method()->itable_index();
749 assert(info.itable_index() == index, "");
750 }
751 } else {
752 assert(info.call_kind() == CallInfo::direct_call ||
753 info.call_kind() == CallInfo::vtable_call, "");
754 }
755 #endif
756 switch (info.call_kind()) {
757 case CallInfo::direct_call:
758 cache_entry(thread)->set_direct_call(
759 bytecode,
760 info.resolved_method());
761 break;
762 case CallInfo::vtable_call:
763 cache_entry(thread)->set_vtable_call(
764 bytecode,
765 info.resolved_method(),
766 info.vtable_index());
767 break;
768 case CallInfo::itable_call:
769 cache_entry(thread)->set_itable_call(
770 bytecode,
771 info.resolved_method(),
772 info.itable_index());
773 break;
774 default: ShouldNotReachHere();
775 }
776 }
777 IRT_END
778
779
780 // First time execution: Resolve symbols, create a permanent MethodType object.
781 IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) {
782 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
783
784 // resolve method
785 CallInfo info;
786 constantPoolHandle pool(thread, method(thread)->constants());
787
788 {
789 JvmtiHideSingleStepping jhss(thread);
790 LinkResolver::resolve_invoke(info, Handle(), pool,
791 get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
792 } // end JvmtiHideSingleStepping
793
794 cache_entry(thread)->set_method_handle(pool, info);
795 }
796 IRT_END
797
798
799 // First time execution: Resolve symbols, create a permanent CallSite object.
800 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
801 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
802
803 //TO DO: consider passing BCI to Java.
804 // int caller_bci = method(thread)->bci_from(bcp(thread));
805
806 // resolve method
807 CallInfo info;
808 constantPoolHandle pool(thread, method(thread)->constants());
809 int index = get_index_u4(thread, bytecode);
810 {
811 JvmtiHideSingleStepping jhss(thread);
812 LinkResolver::resolve_invoke(info, Handle(), pool,
813 index, bytecode, CHECK);
814 } // end JvmtiHideSingleStepping
815
816 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
817 cp_cache_entry->set_dynamic_call(pool, info);
818 }
819 IRT_END
820
821
822 //------------------------------------------------------------------------------------------------------------------------
823 // Miscellaneous
824
825
826 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
827 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
828 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
829 if (branch_bcp != NULL && nm != NULL) {
830 // This was a successful request for an OSR nmethod. Because
831 // frequency_counter_overflow_inner ends with a safepoint check,
832 // nm could have been unloaded so look it up again. It's unsafe
833 // to examine nm directly since it might have been freed and used
834 // for something else.
835 frame fr = thread->last_frame();
836 Method* method = fr.interpreter_frame_method();
837 int bci = method->bci_from(fr.interpreter_frame_bcp());
838 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
839 }
840 #ifndef PRODUCT
841 if (TraceOnStackReplacement) {
842 if (nm != NULL) {
843 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry());
844 nm->print();
845 }
846 }
847 #endif
848 return nm;
849 }
850
851 IRT_ENTRY(nmethod*,
852 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
853 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
854 // flag, in case this method triggers classloading which will call into Java.
855 UnlockFlagSaver fs(thread);
856
857 frame fr = thread->last_frame();
858 assert(fr.is_interpreted_frame(), "must come from interpreter");
859 methodHandle method(thread, fr.interpreter_frame_method());
860 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
861 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
862
863 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
864 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
865 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
866
867 if (osr_nm != NULL) {
868 // We may need to do on-stack replacement which requires that no
869 // monitors in the activation are biased because their
870 // BasicObjectLocks will need to migrate during OSR. Force
871 // unbiasing of all monitors in the activation now (even though
872 // the OSR nmethod might be invalidated) because we don't have a
873 // safepoint opportunity later once the migration begins.
874 if (UseBiasedLocking) {
875 ResourceMark rm;
876 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
877 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
878 kptr < fr.interpreter_frame_monitor_begin();
879 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
880 if( kptr->obj() != NULL ) {
881 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
882 }
883 }
884 BiasedLocking::revoke(objects_to_revoke);
885 }
886 }
887 return osr_nm;
888 IRT_END
889
890 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
891 assert(ProfileInterpreter, "must be profiling interpreter");
892 int bci = method->bci_from(cur_bcp);
893 MethodData* mdo = method->method_data();
894 if (mdo == NULL) return 0;
895 return mdo->bci_to_di(bci);
896 IRT_END
897
898 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
899 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
900 // flag, in case this method triggers classloading which will call into Java.
901 UnlockFlagSaver fs(thread);
902
903 assert(ProfileInterpreter, "must be profiling interpreter");
904 frame fr = thread->last_frame();
905 assert(fr.is_interpreted_frame(), "must come from interpreter");
906 methodHandle method(thread, fr.interpreter_frame_method());
907 Method::build_interpreter_method_data(method, THREAD);
908 if (HAS_PENDING_EXCEPTION) {
909 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
910 CLEAR_PENDING_EXCEPTION;
911 // and fall through...
912 }
913 IRT_END
914
915
916 #ifdef ASSERT
917 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
918 assert(ProfileInterpreter, "must be profiling interpreter");
919
920 MethodData* mdo = method->method_data();
921 assert(mdo != NULL, "must not be null");
922
923 int bci = method->bci_from(bcp);
924
925 address mdp2 = mdo->bci_to_dp(bci);
926 if (mdp != mdp2) {
927 ResourceMark rm;
928 ResetNoHandleMark rnm; // In a LEAF entry.
929 HandleMark hm;
930 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
931 int current_di = mdo->dp_to_di(mdp);
932 int expected_di = mdo->dp_to_di(mdp2);
933 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
934 int expected_approx_bci = mdo->data_at(expected_di)->bci();
935 int approx_bci = -1;
936 if (current_di >= 0) {
937 approx_bci = mdo->data_at(current_di)->bci();
938 }
939 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
940 mdo->print_on(tty);
941 method->print_codes();
942 }
943 assert(mdp == mdp2, "wrong mdp");
944 IRT_END
945 #endif // ASSERT
946
947 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
948 assert(ProfileInterpreter, "must be profiling interpreter");
949 ResourceMark rm(thread);
950 HandleMark hm(thread);
951 frame fr = thread->last_frame();
952 assert(fr.is_interpreted_frame(), "must come from interpreter");
953 MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
954
955 // Grab a lock to ensure atomic access to setting the return bci and
956 // the displacement. This can block and GC, invalidating all naked oops.
957 MutexLocker ml(RetData_lock);
958
959 // ProfileData is essentially a wrapper around a derived oop, so we
960 // need to take the lock before making any ProfileData structures.
961 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
962 RetData* rdata = data->as_RetData();
963 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
964 fr.interpreter_frame_set_mdp(new_mdp);
965 IRT_END
966
967 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
968 MethodCounters* mcs = Method::build_method_counters(m, thread);
969 if (HAS_PENDING_EXCEPTION) {
970 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
971 CLEAR_PENDING_EXCEPTION;
972 }
973 return mcs;
974 IRT_END
975
976
977 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
978 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
979 // stack traversal automatically takes care of preserving arguments for invoke, so
980 // this is no longer needed.
981
982 // IRT_END does an implicit safepoint check, hence we are guaranteed to block
983 // if this is called during a safepoint
984
985 if (JvmtiExport::should_post_single_step()) {
986 // We are called during regular safepoints and when the VM is
987 // single stepping. If any thread is marked for single stepping,
988 // then we may have JVMTI work to do.
989 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
990 }
991 IRT_END
992
993 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
994 ConstantPoolCacheEntry *cp_entry))
995
996 // check the access_flags for the field in the klass
997
998 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
999 int index = cp_entry->field_index();
1000 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1001
1002 bool is_static = (obj == NULL);
1003 HandleMark hm(thread);
1004
1005 Handle h_obj;
1006 if (!is_static) {
1007 // non-static field accessors have an object, but we need a handle
1008 h_obj = Handle(thread, obj);
1009 }
1010 instanceKlassHandle h_cp_entry_f1(thread, (Klass*)cp_entry->f1_as_klass());
1011 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static);
1012 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
1013 IRT_END
1014
1015 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1016 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1017
1018 Klass* k = (Klass*)cp_entry->f1_as_klass();
1019
1020 // check the access_flags for the field in the klass
1021 InstanceKlass* ik = InstanceKlass::cast(k);
1022 int index = cp_entry->field_index();
1023 // bail out if field modifications are not watched
1024 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1025
1026 char sig_type = '\0';
1027
1028 switch(cp_entry->flag_state()) {
1029 case btos: sig_type = 'Z'; break;
1030 case ctos: sig_type = 'C'; break;
1031 case stos: sig_type = 'S'; break;
1032 case itos: sig_type = 'I'; break;
1033 case ftos: sig_type = 'F'; break;
1034 case atos: sig_type = 'L'; break;
1035 case ltos: sig_type = 'J'; break;
1036 case dtos: sig_type = 'D'; break;
1037 default: ShouldNotReachHere(); return;
1038 }
1039 bool is_static = (obj == NULL);
1040
1041 HandleMark hm(thread);
1042 instanceKlassHandle h_klass(thread, k);
1043 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static);
1044 jvalue fvalue;
1045 #ifdef _LP64
1046 fvalue = *value;
1047 #else
1048 // Long/double values are stored unaligned and also noncontiguously with
1049 // tagged stacks. We can't just do a simple assignment even in the non-
1050 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1051 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1052 // We assume that the two halves of longs/doubles are stored in interpreter
1053 // stack slots in platform-endian order.
1054 jlong_accessor u;
1055 jint* newval = (jint*)value;
1056 u.words[0] = newval[0];
1057 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1058 fvalue.j = u.long_value;
1059 #endif // _LP64
1060
1061 Handle h_obj;
1062 if (!is_static) {
1063 // non-static field accessors have an object, but we need a handle
1064 h_obj = Handle(thread, obj);
1065 }
1066
1067 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1068 fid, sig_type, &fvalue);
1069 IRT_END
1070
1071 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1072 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1073 IRT_END
1074
1075
1076 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1077 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1078 IRT_END
1079
1080 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1081 {
1082 return (Interpreter::contains(pc) ? 1 : 0);
1083 }
1084 IRT_END
1085
1086
1087 // Implementation of SignatureHandlerLibrary
1088
1089 address SignatureHandlerLibrary::set_handler_blob() {
1090 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1091 if (handler_blob == NULL) {
1092 return NULL;
1093 }
1094 address handler = handler_blob->code_begin();
1095 _handler_blob = handler_blob;
1096 _handler = handler;
1097 return handler;
1098 }
1099
1100 void SignatureHandlerLibrary::initialize() {
1101 if (_fingerprints != NULL) {
1102 return;
1103 }
1104 if (set_handler_blob() == NULL) {
1105 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1106 }
1107
1108 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1109 SignatureHandlerLibrary::buffer_size);
1110 _buffer = bb->code_begin();
1111
1112 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1113 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1114 }
1115
1116 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1117 address handler = _handler;
1118 int insts_size = buffer->pure_insts_size();
1119 if (handler + insts_size > _handler_blob->code_end()) {
1120 // get a new handler blob
1121 handler = set_handler_blob();
1122 }
1123 if (handler != NULL) {
1124 memcpy(handler, buffer->insts_begin(), insts_size);
1125 pd_set_handler(handler);
1126 ICache::invalidate_range(handler, insts_size);
1127 _handler = handler + insts_size;
1128 }
1129 return handler;
1130 }
1131
1132 void SignatureHandlerLibrary::add(methodHandle method) {
1133 if (method->signature_handler() == NULL) {
1134 // use slow signature handler if we can't do better
1135 int handler_index = -1;
1136 // check if we can use customized (fast) signature handler
1137 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1138 // use customized signature handler
1139 MutexLocker mu(SignatureHandlerLibrary_lock);
1140 // make sure data structure is initialized
1141 initialize();
1142 // lookup method signature's fingerprint
1143 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1144 handler_index = _fingerprints->find(fingerprint);
1145 // create handler if necessary
1146 if (handler_index < 0) {
1147 ResourceMark rm;
1148 ptrdiff_t align_offset = (address)
1149 round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1150 CodeBuffer buffer((address)(_buffer + align_offset),
1151 SignatureHandlerLibrary::buffer_size - align_offset);
1152 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1153 // copy into code heap
1154 address handler = set_handler(&buffer);
1155 if (handler == NULL) {
1156 // use slow signature handler
1157 } else {
1158 // debugging suppport
1159 if (PrintSignatureHandlers) {
1160 tty->cr();
1161 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1162 _handlers->length(),
1163 (method->is_static() ? "static" : "receiver"),
1164 method->name_and_sig_as_C_string(),
1165 fingerprint,
1166 buffer.insts_size());
1167 Disassembler::decode(handler, handler + buffer.insts_size());
1168 #ifndef PRODUCT
1169 tty->print_cr(" --- associated result handler ---");
1170 address rh_begin = Interpreter::result_handler(method()->result_type());
1171 address rh_end = rh_begin;
1172 while (*(int*)rh_end != 0) {
1173 rh_end += sizeof(int);
1174 }
1175 Disassembler::decode(rh_begin, rh_end);
1176 #endif
1177 }
1178 // add handler to library
1179 _fingerprints->append(fingerprint);
1180 _handlers->append(handler);
1181 // set handler index
1182 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1183 handler_index = _fingerprints->length() - 1;
1184 }
1185 }
1186 // Set handler under SignatureHandlerLibrary_lock
1187 if (handler_index < 0) {
1188 // use generic signature handler
1189 method->set_signature_handler(Interpreter::slow_signature_handler());
1190 } else {
1191 // set handler
1192 method->set_signature_handler(_handlers->at(handler_index));
1193 }
1194 } else {
1195 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1196 // use generic signature handler
1197 method->set_signature_handler(Interpreter::slow_signature_handler());
1198 }
1199 }
1200 #ifdef ASSERT
1201 int handler_index = -1;
1202 int fingerprint_index = -2;
1203 {
1204 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1205 // in any way if accessed from multiple threads. To avoid races with another
1206 // thread which may change the arrays in the above, mutex protected block, we
1207 // have to protect this read access here with the same mutex as well!
1208 MutexLocker mu(SignatureHandlerLibrary_lock);
1209 if (_handlers != NULL) {
1210 handler_index = _handlers->find(method->signature_handler());
1211 fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());
1212 }
1213 }
1214 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1215 handler_index == fingerprint_index, "sanity check");
1216 #endif // ASSERT
1217 }
1218
1219
1220 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1221 address SignatureHandlerLibrary::_handler = NULL;
1222 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1223 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1224 address SignatureHandlerLibrary::_buffer = NULL;
1225
1226
1227 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1228 methodHandle m(thread, method);
1229 assert(m->is_native(), "sanity check");
1230 // lookup native function entry point if it doesn't exist
1231 bool in_base_library;
1232 if (!m->has_native_function()) {
1233 NativeLookup::lookup(m, in_base_library, CHECK);
1234 }
1235 // make sure signature handler is installed
1236 SignatureHandlerLibrary::add(m);
1237 // The interpreter entry point checks the signature handler first,
1238 // before trying to fetch the native entry point and klass mirror.
1239 // We must set the signature handler last, so that multiple processors
1240 // preparing the same method will be sure to see non-null entry & mirror.
1241 IRT_END
1242
1243 #if defined(IA32) || defined(AMD64) || defined(ARM)
1244 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1245 if (src_address == dest_address) {
1246 return;
1247 }
1248 ResetNoHandleMark rnm; // In a LEAF entry.
1249 HandleMark hm;
1250 ResourceMark rm;
1251 frame fr = thread->last_frame();
1252 assert(fr.is_interpreted_frame(), "");
1253 jint bci = fr.interpreter_frame_bci();
1254 methodHandle mh(thread, fr.interpreter_frame_method());
1255 Bytecode_invoke invoke(mh, bci);
1256 ArgumentSizeComputer asc(invoke.signature());
1257 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1258 Copy::conjoint_jbytes(src_address, dest_address,
1259 size_of_arguments * Interpreter::stackElementSize);
1260 IRT_END
1261 #endif
1262
1263 #if INCLUDE_JVMTI
1264 // This is a support of the JVMTI PopFrame interface.
1265 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1266 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1267 // The member_name argument is a saved reference (in local#0) to the member_name.
1268 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1269 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1270 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1271 Method* method, address bcp))
1272 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1273 if (code != Bytecodes::_invokestatic) {
1274 return;
1275 }
1276 ConstantPool* cpool = method->constants();
1277 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1278 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1279 Symbol* mname = cpool->name_ref_at(cp_index);
1280
1281 if (MethodHandles::has_member_arg(cname, mname)) {
1282 oop member_name_oop = (oop) member_name;
1283 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1284 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1285 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1286 }
1287 thread->set_vm_result(member_name_oop);
1288 }
1289 IRT_END
1290 #endif // INCLUDE_JVMTI