1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/codeCache.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/disassembler.hpp"
32 #include "gc/shared/collectedHeap.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/interpreterRuntime.hpp"
35 #include "interpreter/linkResolver.hpp"
36 #include "interpreter/templateTable.hpp"
37 #include "logging/log.hpp"
38 #include "memory/oopFactory.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.inline.hpp"
41 #include "oops/constantPool.hpp"
42 #include "oops/instanceKlass.hpp"
43 #include "oops/methodData.hpp"
44 #include "oops/objArrayKlass.hpp"
45 #include "oops/objArrayOop.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/symbol.hpp"
48 #include "prims/jvmtiExport.hpp"
49 #include "prims/nativeLookup.hpp"
50 #include "runtime/atomic.hpp"
51 #include "runtime/biasedLocking.hpp"
52 #include "runtime/compilationPolicy.hpp"
53 #include "runtime/deoptimization.hpp"
54 #include "runtime/fieldDescriptor.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/icache.hpp"
57 #include "runtime/interfaceSupport.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/jfieldIDWorkaround.hpp"
60 #include "runtime/osThread.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "runtime/stubRoutines.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/threadCritical.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/events.hpp"
67 #ifdef COMPILER2
68 #include "opto/runtime.hpp"
69 #endif
70
71 class UnlockFlagSaver {
72 private:
73 JavaThread* _thread;
74 bool _do_not_unlock;
75 public:
76 UnlockFlagSaver(JavaThread* t) {
77 _thread = t;
78 _do_not_unlock = t->do_not_unlock_if_synchronized();
79 t->set_do_not_unlock_if_synchronized(false);
80 }
81 ~UnlockFlagSaver() {
82 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
83 }
84 };
85
86 //------------------------------------------------------------------------------------------------------------------------
87 // State accessors
88
89 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
90 last_frame(thread).interpreter_frame_set_bcp(bcp);
91 if (ProfileInterpreter) {
92 // ProfileTraps uses MDOs independently of ProfileInterpreter.
93 // That is why we must check both ProfileInterpreter and mdo != NULL.
94 MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
95 if (mdo != NULL) {
96 NEEDS_CLEANUP;
97 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
98 }
99 }
100 }
101
102 //------------------------------------------------------------------------------------------------------------------------
103 // Constants
104
105
106 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
107 // access constant pool
108 ConstantPool* pool = method(thread)->constants();
109 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
110 constantTag tag = pool->tag_at(index);
111
112 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
113 Klass* klass = pool->klass_at(index, CHECK);
114 oop java_class = klass->java_mirror();
115 thread->set_vm_result(java_class);
116 IRT_END
117
118 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
119 assert(bytecode == Bytecodes::_fast_aldc ||
120 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
121 ResourceMark rm(thread);
122 methodHandle m (thread, method(thread));
123 Bytecode_loadconstant ldc(m, bci(thread));
124 oop result = ldc.resolve_constant(CHECK);
125 #ifdef ASSERT
126 {
127 // The bytecode wrappers aren't GC-safe so construct a new one
128 Bytecode_loadconstant ldc2(m, bci(thread));
129 oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
130 assert(result == coop, "expected result for assembly code");
131 }
132 #endif
133 thread->set_vm_result(result);
134 }
135 IRT_END
136
137
138 //------------------------------------------------------------------------------------------------------------------------
139 // Allocation
140
141 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
142 Klass* k = pool->klass_at(index, CHECK);
143 InstanceKlass* klass = InstanceKlass::cast(k);
144
145 // Make sure we are not instantiating an abstract klass
146 klass->check_valid_for_instantiation(true, CHECK);
147
148 // Make sure klass is initialized
149 klass->initialize(CHECK);
150
151 // At this point the class may not be fully initialized
152 // because of recursive initialization. If it is fully
153 // initialized & has_finalized is not set, we rewrite
154 // it into its fast version (Note: no locking is needed
155 // here since this is an atomic byte write and can be
156 // done more than once).
157 //
158 // Note: In case of classes with has_finalized we don't
159 // rewrite since that saves us an extra check in
160 // the fast version which then would call the
161 // slow version anyway (and do a call back into
162 // Java).
163 // If we have a breakpoint, then we don't rewrite
164 // because the _breakpoint bytecode would be lost.
165 oop obj = klass->allocate_instance(CHECK);
166 thread->set_vm_result(obj);
167 IRT_END
168
169
170 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
171 oop obj = oopFactory::new_typeArray(type, size, CHECK);
172 thread->set_vm_result(obj);
173 IRT_END
174
175
176 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
177 Klass* klass = pool->klass_at(index, CHECK);
178 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
179 thread->set_vm_result(obj);
180 IRT_END
181
182
183 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
184 // We may want to pass in more arguments - could make this slightly faster
185 ConstantPool* constants = method(thread)->constants();
186 int i = get_index_u2(thread, Bytecodes::_multianewarray);
187 Klass* klass = constants->klass_at(i, CHECK);
188 int nof_dims = number_of_dimensions(thread);
189 assert(klass->is_klass(), "not a class");
190 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
191
192 // We must create an array of jints to pass to multi_allocate.
193 ResourceMark rm(thread);
194 const int small_dims = 10;
195 jint dim_array[small_dims];
196 jint *dims = &dim_array[0];
197 if (nof_dims > small_dims) {
198 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
199 }
200 for (int index = 0; index < nof_dims; index++) {
201 // offset from first_size_address is addressed as local[index]
202 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
203 dims[index] = first_size_address[n];
204 }
205 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
206 thread->set_vm_result(obj);
207 IRT_END
208
209
210 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
211 assert(oopDesc::is_oop(obj), "must be a valid oop");
212 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
213 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
214 IRT_END
215
216
217 // Quicken instance-of and check-cast bytecodes
218 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
219 // Force resolving; quicken the bytecode
220 int which = get_index_u2(thread, Bytecodes::_checkcast);
221 ConstantPool* cpool = method(thread)->constants();
222 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
223 // program we might have seen an unquick'd bytecode in the interpreter but have another
224 // thread quicken the bytecode before we get here.
225 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
226 Klass* klass = cpool->klass_at(which, CHECK);
227 thread->set_vm_result_2(klass);
228 IRT_END
229
230
231 //------------------------------------------------------------------------------------------------------------------------
232 // Exceptions
233
234 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
235 const methodHandle& trap_method, int trap_bci, TRAPS) {
236 if (trap_method.not_null()) {
237 MethodData* trap_mdo = trap_method->method_data();
238 if (trap_mdo == NULL) {
239 Method::build_interpreter_method_data(trap_method, THREAD);
240 if (HAS_PENDING_EXCEPTION) {
241 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
242 "we expect only an OOM error here");
243 CLEAR_PENDING_EXCEPTION;
244 }
245 trap_mdo = trap_method->method_data();
246 // and fall through...
247 }
248 if (trap_mdo != NULL) {
249 // Update per-method count of trap events. The interpreter
250 // is updating the MDO to simulate the effect of compiler traps.
251 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
252 }
253 }
254 }
255
256 // Assume the compiler is (or will be) interested in this event.
257 // If necessary, create an MDO to hold the information, and record it.
258 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
259 assert(ProfileTraps, "call me only if profiling");
260 methodHandle trap_method(thread, method(thread));
261 int trap_bci = trap_method->bci_from(bcp(thread));
262 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
263 }
264
265 #ifdef CC_INTERP
266 // As legacy note_trap, but we have more arguments.
267 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
268 methodHandle trap_method(method);
269 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
270 IRT_END
271
272 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
273 // for each exception.
274 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
275 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
276 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
277 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
278 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
279 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
280 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
281 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
282 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
283 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
284 #endif // CC_INTERP
285
286
287 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
288 // get klass
289 InstanceKlass* klass = InstanceKlass::cast(k);
290 assert(klass->is_initialized(),
291 "this klass should have been initialized during VM initialization");
292 // create instance - do not call constructor since we may have no
293 // (java) stack space left (should assert constructor is empty)
294 Handle exception;
295 oop exception_oop = klass->allocate_instance(CHECK_(exception));
296 exception = Handle(THREAD, exception_oop);
297 if (StackTraceInThrowable) {
298 java_lang_Throwable::fill_in_stack_trace(exception);
299 }
300 return exception;
301 }
302
303 // Special handling for stack overflow: since we don't have any (java) stack
304 // space left we use the pre-allocated & pre-initialized StackOverflowError
305 // klass to create an stack overflow error instance. We do not call its
306 // constructor for the same reason (it is empty, anyway).
307 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
308 Handle exception = get_preinitialized_exception(
309 SystemDictionary::StackOverflowError_klass(),
310 CHECK);
311 // Increment counter for hs_err file reporting
312 Atomic::inc(&Exceptions::_stack_overflow_errors);
313 THROW_HANDLE(exception);
314 IRT_END
315
316 IRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
317 Handle exception = get_preinitialized_exception(
318 SystemDictionary::StackOverflowError_klass(),
319 CHECK);
320 java_lang_Throwable::set_message(exception(),
321 Universe::delayed_stack_overflow_error_message());
322 // Increment counter for hs_err file reporting
323 Atomic::inc(&Exceptions::_stack_overflow_errors);
324 THROW_HANDLE(exception);
325 IRT_END
326
327 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
328 // lookup exception klass
329 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
330 if (ProfileTraps) {
331 if (s == vmSymbols::java_lang_ArithmeticException()) {
332 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
333 } else if (s == vmSymbols::java_lang_NullPointerException()) {
334 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
335 }
336 }
337 // create exception
338 Handle exception = Exceptions::new_exception(thread, s, message);
339 thread->set_vm_result(exception());
340 IRT_END
341
342
343 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
344 ResourceMark rm(thread);
345 const char* klass_name = obj->klass()->external_name();
346 // lookup exception klass
347 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
348 if (ProfileTraps) {
349 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
350 }
351 // create exception, with klass name as detail message
352 Handle exception = Exceptions::new_exception(thread, s, klass_name);
353 thread->set_vm_result(exception());
354 IRT_END
355
356
357 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
358 char message[jintAsStringSize];
359 // lookup exception klass
360 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
361 if (ProfileTraps) {
362 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
363 }
364 // create exception
365 sprintf(message, "%d", index);
366 THROW_MSG(s, message);
367 IRT_END
368
369 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
370 JavaThread* thread, oopDesc* obj))
371
372 ResourceMark rm(thread);
373 char* message = SharedRuntime::generate_class_cast_message(
374 thread, obj->klass());
375
376 if (ProfileTraps) {
377 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
378 }
379
380 // create exception
381 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
382 IRT_END
383
384 // exception_handler_for_exception(...) returns the continuation address,
385 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
386 // The exception oop is returned to make sure it is preserved over GC (it
387 // is only on the stack if the exception was thrown explicitly via athrow).
388 // During this operation, the expression stack contains the values for the
389 // bci where the exception happened. If the exception was propagated back
390 // from a call, the expression stack contains the values for the bci at the
391 // invoke w/o arguments (i.e., as if one were inside the call).
392 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
393
394 Handle h_exception(thread, exception);
395 methodHandle h_method (thread, method(thread));
396 constantPoolHandle h_constants(thread, h_method->constants());
397 bool should_repeat;
398 int handler_bci;
399 int current_bci = bci(thread);
400
401 if (thread->frames_to_pop_failed_realloc() > 0) {
402 // Allocation of scalar replaced object used in this frame
403 // failed. Unconditionally pop the frame.
404 thread->dec_frames_to_pop_failed_realloc();
405 thread->set_vm_result(h_exception());
406 // If the method is synchronized we already unlocked the monitor
407 // during deoptimization so the interpreter needs to skip it when
408 // the frame is popped.
409 thread->set_do_not_unlock_if_synchronized(true);
410 #ifdef CC_INTERP
411 return (address) -1;
412 #else
413 return Interpreter::remove_activation_entry();
414 #endif
415 }
416
417 // Need to do this check first since when _do_not_unlock_if_synchronized
418 // is set, we don't want to trigger any classloading which may make calls
419 // into java, or surprisingly find a matching exception handler for bci 0
420 // since at this moment the method hasn't been "officially" entered yet.
421 if (thread->do_not_unlock_if_synchronized()) {
422 ResourceMark rm;
423 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
424 thread->set_vm_result(exception);
425 #ifdef CC_INTERP
426 return (address) -1;
427 #else
428 return Interpreter::remove_activation_entry();
429 #endif
430 }
431
432 do {
433 should_repeat = false;
434
435 // assertions
436 #ifdef ASSERT
437 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
438 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
439 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
440 if (ExitVMOnVerifyError) vm_exit(-1);
441 ShouldNotReachHere();
442 }
443 #endif
444
445 // tracing
446 if (log_is_enabled(Info, exceptions)) {
447 ResourceMark rm(thread);
448 stringStream tempst;
449 tempst.print("interpreter method <%s>\n"
450 " at bci %d for thread " INTPTR_FORMAT,
451 h_method->print_value_string(), current_bci, p2i(thread));
452 Exceptions::log_exception(h_exception, tempst);
453 }
454 // Don't go paging in something which won't be used.
455 // else if (extable->length() == 0) {
456 // // disabled for now - interpreter is not using shortcut yet
457 // // (shortcut is not to call runtime if we have no exception handlers)
458 // // warning("performance bug: should not call runtime if method has no exception handlers");
459 // }
460 // for AbortVMOnException flag
461 Exceptions::debug_check_abort(h_exception);
462
463 // exception handler lookup
464 Klass* klass = h_exception->klass();
465 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
466 if (HAS_PENDING_EXCEPTION) {
467 // We threw an exception while trying to find the exception handler.
468 // Transfer the new exception to the exception handle which will
469 // be set into thread local storage, and do another lookup for an
470 // exception handler for this exception, this time starting at the
471 // BCI of the exception handler which caused the exception to be
472 // thrown (bug 4307310).
473 h_exception = Handle(THREAD, PENDING_EXCEPTION);
474 CLEAR_PENDING_EXCEPTION;
475 if (handler_bci >= 0) {
476 current_bci = handler_bci;
477 should_repeat = true;
478 }
479 }
480 } while (should_repeat == true);
481
482 #if INCLUDE_JVMCI
483 if (EnableJVMCI && h_method->method_data() != NULL) {
484 ResourceMark rm(thread);
485 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);
486 if (pdata != NULL && pdata->is_BitData()) {
487 BitData* bit_data = (BitData*) pdata;
488 bit_data->set_exception_seen();
489 }
490 }
491 #endif
492
493 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
494 // time throw or a stack unwinding throw and accordingly notify the debugger
495 if (JvmtiExport::can_post_on_exceptions()) {
496 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
497 }
498
499 #ifdef CC_INTERP
500 address continuation = (address)(intptr_t) handler_bci;
501 #else
502 address continuation = NULL;
503 #endif
504 address handler_pc = NULL;
505 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
506 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
507 // handler in this method, or (b) after a stack overflow there is not yet
508 // enough stack space available to reprotect the stack.
509 #ifndef CC_INTERP
510 continuation = Interpreter::remove_activation_entry();
511 #endif
512 #if COMPILER2_OR_JVMCI
513 // Count this for compilation purposes
514 h_method->interpreter_throwout_increment(THREAD);
515 #endif
516 } else {
517 // handler in this method => change bci/bcp to handler bci/bcp and continue there
518 handler_pc = h_method->code_base() + handler_bci;
519 #ifndef CC_INTERP
520 set_bcp_and_mdp(handler_pc, thread);
521 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
522 #endif
523 }
524 // notify debugger of an exception catch
525 // (this is good for exceptions caught in native methods as well)
526 if (JvmtiExport::can_post_on_exceptions()) {
527 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
528 }
529
530 thread->set_vm_result(h_exception());
531 return continuation;
532 IRT_END
533
534
535 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
536 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
537 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
538 IRT_END
539
540
541 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
542 THROW(vmSymbols::java_lang_AbstractMethodError());
543 IRT_END
544
545
546 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
547 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
548 IRT_END
549
550
551 //------------------------------------------------------------------------------------------------------------------------
552 // Fields
553 //
554
555 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) {
556 Thread* THREAD = thread;
557 // resolve field
558 fieldDescriptor info;
559 constantPoolHandle pool(thread, method(thread)->constants());
560 methodHandle m(thread, method(thread));
561 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
562 bytecode == Bytecodes::_putstatic);
563 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
564
565 {
566 JvmtiHideSingleStepping jhss(thread);
567 LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
568 m, bytecode, CHECK);
569 } // end JvmtiHideSingleStepping
570
571 // check if link resolution caused cpCache to be updated
572 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
573 if (cp_cache_entry->is_resolved(bytecode)) return;
574
575 // compute auxiliary field attributes
576 TosState state = as_TosState(info.field_type());
577
578 // Resolution of put instructions on final fields is delayed. That is required so that
579 // exceptions are thrown at the correct place (when the instruction is actually invoked).
580 // If we do not resolve an instruction in the current pass, leaving the put_code
581 // set to zero will cause the next put instruction to the same field to reresolve.
582
583 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
584 // to final instance fields with updates originating from a method different than <init>)
585 // is inhibited. A putfield instruction targeting an instance final field must throw
586 // an IllegalAccessError if the instruction is not in an instance
587 // initializer method <init>. If resolution were not inhibited, a putfield
588 // in an initializer method could be resolved in the initializer. Subsequent
589 // putfield instructions to the same field would then use cached information.
590 // As a result, those instructions would not pass through the VM. That is,
591 // checks in resolve_field_access() would not be executed for those instructions
592 // and the required IllegalAccessError would not be thrown.
593 //
594 // Also, we need to delay resolving getstatic and putstatic instructions until the
595 // class is initialized. This is required so that access to the static
596 // field will call the initialization function every time until the class
597 // is completely initialized ala. in 2.17.5 in JVM Specification.
598 InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
599 bool uninitialized_static = is_static && !klass->is_initialized();
600 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
601 info.has_initialized_final_update();
602 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
603
604 Bytecodes::Code get_code = (Bytecodes::Code)0;
605 Bytecodes::Code put_code = (Bytecodes::Code)0;
606 if (!uninitialized_static) {
607 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
608 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
609 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
610 }
611 }
612
613 cp_cache_entry->set_field(
614 get_code,
615 put_code,
616 info.field_holder(),
617 info.index(),
618 info.offset(),
619 state,
620 info.access_flags().is_final(),
621 info.access_flags().is_volatile(),
622 pool->pool_holder()
623 );
624 }
625
626
627 //------------------------------------------------------------------------------------------------------------------------
628 // Synchronization
629 //
630 // The interpreter's synchronization code is factored out so that it can
631 // be shared by method invocation and synchronized blocks.
632 //%note synchronization_3
633
634 //%note monitor_1
635 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
636 #ifdef ASSERT
637 thread->last_frame().interpreter_frame_verify_monitor(elem);
638 #endif
639 if (PrintBiasedLockingStatistics) {
640 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
641 }
642 Handle h_obj(thread, elem->obj());
643 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
644 "must be NULL or an object");
645 if (UseBiasedLocking) {
646 // Retry fast entry if bias is revoked to avoid unnecessary inflation
647 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
648 } else {
649 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
650 }
651 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
652 "must be NULL or an object");
653 #ifdef ASSERT
654 thread->last_frame().interpreter_frame_verify_monitor(elem);
655 #endif
656 IRT_END
657
658
659 //%note monitor_1
660 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
661 #ifdef ASSERT
662 thread->last_frame().interpreter_frame_verify_monitor(elem);
663 #endif
664 Handle h_obj(thread, elem->obj());
665 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
666 "must be NULL or an object");
667 if (elem == NULL || h_obj()->is_unlocked()) {
668 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
669 }
670 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
671 // Free entry. This must be done here, since a pending exception might be installed on
672 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
673 elem->set_obj(NULL);
674 #ifdef ASSERT
675 thread->last_frame().interpreter_frame_verify_monitor(elem);
676 #endif
677 IRT_END
678
679
680 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
681 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
682 IRT_END
683
684
685 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
686 // Returns an illegal exception to install into the current thread. The
687 // pending_exception flag is cleared so normal exception handling does not
688 // trigger. Any current installed exception will be overwritten. This
689 // method will be called during an exception unwind.
690
691 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
692 Handle exception(thread, thread->vm_result());
693 assert(exception() != NULL, "vm result should be set");
694 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
695 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
696 exception = get_preinitialized_exception(
697 SystemDictionary::IllegalMonitorStateException_klass(),
698 CATCH);
699 }
700 thread->set_vm_result(exception());
701 IRT_END
702
703
704 //------------------------------------------------------------------------------------------------------------------------
705 // Invokes
706
707 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
708 return method->orig_bytecode_at(method->bci_from(bcp));
709 IRT_END
710
711 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
712 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
713 IRT_END
714
715 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
716 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
717 IRT_END
718
719 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) {
720 Thread* THREAD = thread;
721 // extract receiver from the outgoing argument list if necessary
722 Handle receiver(thread, NULL);
723 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
724 bytecode == Bytecodes::_invokespecial) {
725 ResourceMark rm(thread);
726 methodHandle m (thread, method(thread));
727 Bytecode_invoke call(m, bci(thread));
728 Symbol* signature = call.signature();
729 receiver = Handle(thread,
730 thread->last_frame().interpreter_callee_receiver(signature));
731 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
732 "sanity check");
733 assert(receiver.is_null() ||
734 !Universe::heap()->is_in_reserved(receiver->klass()),
735 "sanity check");
736 }
737
738 // resolve method
739 CallInfo info;
740 constantPoolHandle pool(thread, method(thread)->constants());
741
742 {
743 JvmtiHideSingleStepping jhss(thread);
744 LinkResolver::resolve_invoke(info, receiver, pool,
745 get_index_u2_cpcache(thread, bytecode), bytecode,
746 CHECK);
747 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
748 int retry_count = 0;
749 while (info.resolved_method()->is_old()) {
750 // It is very unlikely that method is redefined more than 100 times
751 // in the middle of resolve. If it is looping here more than 100 times
752 // means then there could be a bug here.
753 guarantee((retry_count++ < 100),
754 "Could not resolve to latest version of redefined method");
755 // method is redefined in the middle of resolve so re-try.
756 LinkResolver::resolve_invoke(info, receiver, pool,
757 get_index_u2_cpcache(thread, bytecode), bytecode,
758 CHECK);
759 }
760 }
761 } // end JvmtiHideSingleStepping
762
763 // check if link resolution caused cpCache to be updated
764 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
765 if (cp_cache_entry->is_resolved(bytecode)) return;
766
767 #ifdef ASSERT
768 if (bytecode == Bytecodes::_invokeinterface) {
769 if (info.resolved_method()->method_holder() ==
770 SystemDictionary::Object_klass()) {
771 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
772 // (see also CallInfo::set_interface for details)
773 assert(info.call_kind() == CallInfo::vtable_call ||
774 info.call_kind() == CallInfo::direct_call, "");
775 methodHandle rm = info.resolved_method();
776 assert(rm->is_final() || info.has_vtable_index(),
777 "should have been set already");
778 } else if (!info.resolved_method()->has_itable_index()) {
779 // Resolved something like CharSequence.toString. Use vtable not itable.
780 assert(info.call_kind() != CallInfo::itable_call, "");
781 } else {
782 // Setup itable entry
783 assert(info.call_kind() == CallInfo::itable_call, "");
784 int index = info.resolved_method()->itable_index();
785 assert(info.itable_index() == index, "");
786 }
787 } else if (bytecode == Bytecodes::_invokespecial) {
788 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
789 } else {
790 assert(info.call_kind() == CallInfo::direct_call ||
791 info.call_kind() == CallInfo::vtable_call, "");
792 }
793 #endif
794 // Get sender or sender's host_klass, and only set cpCache entry to resolved if
795 // it is not an interface. The receiver for invokespecial calls within interface
796 // methods must be checked for every call.
797 InstanceKlass* sender = pool->pool_holder();
798 sender = sender->is_anonymous() ? sender->host_klass() : sender;
799
800 switch (info.call_kind()) {
801 case CallInfo::direct_call:
802 cp_cache_entry->set_direct_call(
803 bytecode,
804 info.resolved_method(),
805 sender->is_interface());
806 break;
807 case CallInfo::vtable_call:
808 cp_cache_entry->set_vtable_call(
809 bytecode,
810 info.resolved_method(),
811 info.vtable_index());
812 break;
813 case CallInfo::itable_call:
814 cp_cache_entry->set_itable_call(
815 bytecode,
816 info.resolved_method(),
817 info.itable_index());
818 break;
819 default: ShouldNotReachHere();
820 }
821 }
822
823
824 // First time execution: Resolve symbols, create a permanent MethodType object.
825 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) {
826 Thread* THREAD = thread;
827 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
828
829 // resolve method
830 CallInfo info;
831 constantPoolHandle pool(thread, method(thread)->constants());
832 {
833 JvmtiHideSingleStepping jhss(thread);
834 LinkResolver::resolve_invoke(info, Handle(), pool,
835 get_index_u2_cpcache(thread, bytecode), bytecode,
836 CHECK);
837 } // end JvmtiHideSingleStepping
838
839 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
840 cp_cache_entry->set_method_handle(pool, info);
841 }
842
843 // First time execution: Resolve symbols, create a permanent CallSite object.
844 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) {
845 Thread* THREAD = thread;
846 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
847
848 //TO DO: consider passing BCI to Java.
849 // int caller_bci = method(thread)->bci_from(bcp(thread));
850
851 // resolve method
852 CallInfo info;
853 constantPoolHandle pool(thread, method(thread)->constants());
854 int index = get_index_u4(thread, bytecode);
855 {
856 JvmtiHideSingleStepping jhss(thread);
857 LinkResolver::resolve_invoke(info, Handle(), pool,
858 index, bytecode, CHECK);
859 } // end JvmtiHideSingleStepping
860
861 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
862 cp_cache_entry->set_dynamic_call(pool, info);
863 }
864
865 // This function is the interface to the assembly code. It returns the resolved
866 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
867 // This function will check for redefinition!
868 IRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) {
869 switch (bytecode) {
870 case Bytecodes::_getstatic:
871 case Bytecodes::_putstatic:
872 case Bytecodes::_getfield:
873 case Bytecodes::_putfield:
874 resolve_get_put(thread, bytecode);
875 break;
876 case Bytecodes::_invokevirtual:
877 case Bytecodes::_invokespecial:
878 case Bytecodes::_invokestatic:
879 case Bytecodes::_invokeinterface:
880 resolve_invoke(thread, bytecode);
881 break;
882 case Bytecodes::_invokehandle:
883 resolve_invokehandle(thread);
884 break;
885 case Bytecodes::_invokedynamic:
886 resolve_invokedynamic(thread);
887 break;
888 default:
889 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
890 break;
891 }
892 }
893 IRT_END
894
895 //------------------------------------------------------------------------------------------------------------------------
896 // Miscellaneous
897
898
899 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
900 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
901 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
902 if (branch_bcp != NULL && nm != NULL) {
903 // This was a successful request for an OSR nmethod. Because
904 // frequency_counter_overflow_inner ends with a safepoint check,
905 // nm could have been unloaded so look it up again. It's unsafe
906 // to examine nm directly since it might have been freed and used
907 // for something else.
908 frame fr = thread->last_frame();
909 Method* method = fr.interpreter_frame_method();
910 int bci = method->bci_from(fr.interpreter_frame_bcp());
911 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
912 }
913 #ifndef PRODUCT
914 if (TraceOnStackReplacement) {
915 if (nm != NULL) {
916 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
917 nm->print();
918 }
919 }
920 #endif
921 return nm;
922 }
923
924 IRT_ENTRY(nmethod*,
925 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
926 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
927 // flag, in case this method triggers classloading which will call into Java.
928 UnlockFlagSaver fs(thread);
929
930 frame fr = thread->last_frame();
931 assert(fr.is_interpreted_frame(), "must come from interpreter");
932 methodHandle method(thread, fr.interpreter_frame_method());
933 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
934 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
935
936 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
937 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
938 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
939
940 if (osr_nm != NULL) {
941 // We may need to do on-stack replacement which requires that no
942 // monitors in the activation are biased because their
943 // BasicObjectLocks will need to migrate during OSR. Force
944 // unbiasing of all monitors in the activation now (even though
945 // the OSR nmethod might be invalidated) because we don't have a
946 // safepoint opportunity later once the migration begins.
947 if (UseBiasedLocking) {
948 ResourceMark rm;
949 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
950 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
951 kptr < fr.interpreter_frame_monitor_begin();
952 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
953 if( kptr->obj() != NULL ) {
954 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
955 }
956 }
957 BiasedLocking::revoke(objects_to_revoke);
958 }
959 }
960 return osr_nm;
961 IRT_END
962
963 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
964 assert(ProfileInterpreter, "must be profiling interpreter");
965 int bci = method->bci_from(cur_bcp);
966 MethodData* mdo = method->method_data();
967 if (mdo == NULL) return 0;
968 return mdo->bci_to_di(bci);
969 IRT_END
970
971 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
972 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
973 // flag, in case this method triggers classloading which will call into Java.
974 UnlockFlagSaver fs(thread);
975
976 assert(ProfileInterpreter, "must be profiling interpreter");
977 frame fr = thread->last_frame();
978 assert(fr.is_interpreted_frame(), "must come from interpreter");
979 methodHandle method(thread, fr.interpreter_frame_method());
980 Method::build_interpreter_method_data(method, THREAD);
981 if (HAS_PENDING_EXCEPTION) {
982 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
983 CLEAR_PENDING_EXCEPTION;
984 // and fall through...
985 }
986 IRT_END
987
988
989 #ifdef ASSERT
990 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
991 assert(ProfileInterpreter, "must be profiling interpreter");
992
993 MethodData* mdo = method->method_data();
994 assert(mdo != NULL, "must not be null");
995
996 int bci = method->bci_from(bcp);
997
998 address mdp2 = mdo->bci_to_dp(bci);
999 if (mdp != mdp2) {
1000 ResourceMark rm;
1001 ResetNoHandleMark rnm; // In a LEAF entry.
1002 HandleMark hm;
1003 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1004 int current_di = mdo->dp_to_di(mdp);
1005 int expected_di = mdo->dp_to_di(mdp2);
1006 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1007 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1008 int approx_bci = -1;
1009 if (current_di >= 0) {
1010 approx_bci = mdo->data_at(current_di)->bci();
1011 }
1012 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1013 mdo->print_on(tty);
1014 method->print_codes();
1015 }
1016 assert(mdp == mdp2, "wrong mdp");
1017 IRT_END
1018 #endif // ASSERT
1019
1020 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
1021 assert(ProfileInterpreter, "must be profiling interpreter");
1022 ResourceMark rm(thread);
1023 HandleMark hm(thread);
1024 frame fr = thread->last_frame();
1025 assert(fr.is_interpreted_frame(), "must come from interpreter");
1026 MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
1027
1028 // Grab a lock to ensure atomic access to setting the return bci and
1029 // the displacement. This can block and GC, invalidating all naked oops.
1030 MutexLocker ml(RetData_lock);
1031
1032 // ProfileData is essentially a wrapper around a derived oop, so we
1033 // need to take the lock before making any ProfileData structures.
1034 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
1035 guarantee(data != NULL, "profile data must be valid");
1036 RetData* rdata = data->as_RetData();
1037 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1038 fr.interpreter_frame_set_mdp(new_mdp);
1039 IRT_END
1040
1041 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
1042 MethodCounters* mcs = Method::build_method_counters(m, thread);
1043 if (HAS_PENDING_EXCEPTION) {
1044 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1045 CLEAR_PENDING_EXCEPTION;
1046 }
1047 return mcs;
1048 IRT_END
1049
1050
1051 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
1052 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1053 // stack traversal automatically takes care of preserving arguments for invoke, so
1054 // this is no longer needed.
1055
1056 // IRT_END does an implicit safepoint check, hence we are guaranteed to block
1057 // if this is called during a safepoint
1058
1059 if (JvmtiExport::should_post_single_step()) {
1060 // We are called during regular safepoints and when the VM is
1061 // single stepping. If any thread is marked for single stepping,
1062 // then we may have JVMTI work to do.
1063 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
1064 }
1065 IRT_END
1066
1067 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1068 ConstantPoolCacheEntry *cp_entry))
1069
1070 // check the access_flags for the field in the klass
1071
1072 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1073 int index = cp_entry->field_index();
1074 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1075
1076 bool is_static = (obj == NULL);
1077 HandleMark hm(thread);
1078
1079 Handle h_obj;
1080 if (!is_static) {
1081 // non-static field accessors have an object, but we need a handle
1082 h_obj = Handle(thread, obj);
1083 }
1084 InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1085 jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);
1086 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), cp_entry_f1, h_obj, fid);
1087 IRT_END
1088
1089 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1090 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1091
1092 Klass* k = cp_entry->f1_as_klass();
1093
1094 // check the access_flags for the field in the klass
1095 InstanceKlass* ik = InstanceKlass::cast(k);
1096 int index = cp_entry->field_index();
1097 // bail out if field modifications are not watched
1098 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1099
1100 char sig_type = '\0';
1101
1102 switch(cp_entry->flag_state()) {
1103 case btos: sig_type = 'B'; break;
1104 case ztos: sig_type = 'Z'; break;
1105 case ctos: sig_type = 'C'; break;
1106 case stos: sig_type = 'S'; break;
1107 case itos: sig_type = 'I'; break;
1108 case ftos: sig_type = 'F'; break;
1109 case atos: sig_type = 'L'; break;
1110 case ltos: sig_type = 'J'; break;
1111 case dtos: sig_type = 'D'; break;
1112 default: ShouldNotReachHere(); return;
1113 }
1114 bool is_static = (obj == NULL);
1115
1116 HandleMark hm(thread);
1117 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);
1118 jvalue fvalue;
1119 #ifdef _LP64
1120 fvalue = *value;
1121 #else
1122 // Long/double values are stored unaligned and also noncontiguously with
1123 // tagged stacks. We can't just do a simple assignment even in the non-
1124 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1125 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1126 // We assume that the two halves of longs/doubles are stored in interpreter
1127 // stack slots in platform-endian order.
1128 jlong_accessor u;
1129 jint* newval = (jint*)value;
1130 u.words[0] = newval[0];
1131 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1132 fvalue.j = u.long_value;
1133 #endif // _LP64
1134
1135 Handle h_obj;
1136 if (!is_static) {
1137 // non-static field accessors have an object, but we need a handle
1138 h_obj = Handle(thread, obj);
1139 }
1140
1141 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), ik, h_obj,
1142 fid, sig_type, &fvalue);
1143 IRT_END
1144
1145 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1146 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1147 IRT_END
1148
1149
1150 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1151 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1152 IRT_END
1153
1154 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1155 {
1156 return (Interpreter::contains(pc) ? 1 : 0);
1157 }
1158 IRT_END
1159
1160
1161 // Implementation of SignatureHandlerLibrary
1162
1163 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1164 // Dummy definition (else normalization method is defined in CPU
1165 // dependant code)
1166 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1167 return fingerprint;
1168 }
1169 #endif
1170
1171 address SignatureHandlerLibrary::set_handler_blob() {
1172 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1173 if (handler_blob == NULL) {
1174 return NULL;
1175 }
1176 address handler = handler_blob->code_begin();
1177 _handler_blob = handler_blob;
1178 _handler = handler;
1179 return handler;
1180 }
1181
1182 void SignatureHandlerLibrary::initialize() {
1183 if (_fingerprints != NULL) {
1184 return;
1185 }
1186 if (set_handler_blob() == NULL) {
1187 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1188 }
1189
1190 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1191 SignatureHandlerLibrary::buffer_size);
1192 _buffer = bb->code_begin();
1193
1194 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1195 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1196 }
1197
1198 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1199 address handler = _handler;
1200 int insts_size = buffer->pure_insts_size();
1201 if (handler + insts_size > _handler_blob->code_end()) {
1202 // get a new handler blob
1203 handler = set_handler_blob();
1204 }
1205 if (handler != NULL) {
1206 memcpy(handler, buffer->insts_begin(), insts_size);
1207 pd_set_handler(handler);
1208 ICache::invalidate_range(handler, insts_size);
1209 _handler = handler + insts_size;
1210 }
1211 return handler;
1212 }
1213
1214 void SignatureHandlerLibrary::add(const methodHandle& method) {
1215 if (method->signature_handler() == NULL) {
1216 // use slow signature handler if we can't do better
1217 int handler_index = -1;
1218 // check if we can use customized (fast) signature handler
1219 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1220 // use customized signature handler
1221 MutexLocker mu(SignatureHandlerLibrary_lock);
1222 // make sure data structure is initialized
1223 initialize();
1224 // lookup method signature's fingerprint
1225 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1226 // allow CPU dependant code to optimize the fingerprints for the fast handler
1227 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1228 handler_index = _fingerprints->find(fingerprint);
1229 // create handler if necessary
1230 if (handler_index < 0) {
1231 ResourceMark rm;
1232 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1233 CodeBuffer buffer((address)(_buffer + align_offset),
1234 SignatureHandlerLibrary::buffer_size - align_offset);
1235 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1236 // copy into code heap
1237 address handler = set_handler(&buffer);
1238 if (handler == NULL) {
1239 // use slow signature handler (without memorizing it in the fingerprints)
1240 } else {
1241 // debugging suppport
1242 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1243 ttyLocker ttyl;
1244 tty->cr();
1245 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1246 _handlers->length(),
1247 (method->is_static() ? "static" : "receiver"),
1248 method->name_and_sig_as_C_string(),
1249 fingerprint,
1250 buffer.insts_size());
1251 if (buffer.insts_size() > 0) {
1252 Disassembler::decode(handler, handler + buffer.insts_size());
1253 }
1254 #ifndef PRODUCT
1255 address rh_begin = Interpreter::result_handler(method()->result_type());
1256 if (CodeCache::contains(rh_begin)) {
1257 // else it might be special platform dependent values
1258 tty->print_cr(" --- associated result handler ---");
1259 address rh_end = rh_begin;
1260 while (*(int*)rh_end != 0) {
1261 rh_end += sizeof(int);
1262 }
1263 Disassembler::decode(rh_begin, rh_end);
1264 } else {
1265 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1266 }
1267 #endif
1268 }
1269 // add handler to library
1270 _fingerprints->append(fingerprint);
1271 _handlers->append(handler);
1272 // set handler index
1273 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1274 handler_index = _fingerprints->length() - 1;
1275 }
1276 }
1277 // Set handler under SignatureHandlerLibrary_lock
1278 if (handler_index < 0) {
1279 // use generic signature handler
1280 method->set_signature_handler(Interpreter::slow_signature_handler());
1281 } else {
1282 // set handler
1283 method->set_signature_handler(_handlers->at(handler_index));
1284 }
1285 } else {
1286 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1287 // use generic signature handler
1288 method->set_signature_handler(Interpreter::slow_signature_handler());
1289 }
1290 }
1291 #ifdef ASSERT
1292 int handler_index = -1;
1293 int fingerprint_index = -2;
1294 {
1295 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1296 // in any way if accessed from multiple threads. To avoid races with another
1297 // thread which may change the arrays in the above, mutex protected block, we
1298 // have to protect this read access here with the same mutex as well!
1299 MutexLocker mu(SignatureHandlerLibrary_lock);
1300 if (_handlers != NULL) {
1301 handler_index = _handlers->find(method->signature_handler());
1302 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1303 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1304 fingerprint_index = _fingerprints->find(fingerprint);
1305 }
1306 }
1307 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1308 handler_index == fingerprint_index, "sanity check");
1309 #endif // ASSERT
1310 }
1311
1312 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1313 int handler_index = -1;
1314 // use customized signature handler
1315 MutexLocker mu(SignatureHandlerLibrary_lock);
1316 // make sure data structure is initialized
1317 initialize();
1318 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1319 handler_index = _fingerprints->find(fingerprint);
1320 // create handler if necessary
1321 if (handler_index < 0) {
1322 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1323 tty->cr();
1324 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1325 _handlers->length(),
1326 p2i(handler),
1327 fingerprint);
1328 }
1329 _fingerprints->append(fingerprint);
1330 _handlers->append(handler);
1331 } else {
1332 if (PrintSignatureHandlers) {
1333 tty->cr();
1334 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1335 _handlers->length(),
1336 fingerprint,
1337 p2i(_handlers->at(handler_index)),
1338 p2i(handler));
1339 }
1340 }
1341 }
1342
1343
1344 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1345 address SignatureHandlerLibrary::_handler = NULL;
1346 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1347 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1348 address SignatureHandlerLibrary::_buffer = NULL;
1349
1350
1351 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1352 methodHandle m(thread, method);
1353 assert(m->is_native(), "sanity check");
1354 // lookup native function entry point if it doesn't exist
1355 bool in_base_library;
1356 if (!m->has_native_function()) {
1357 NativeLookup::lookup(m, in_base_library, CHECK);
1358 }
1359 // make sure signature handler is installed
1360 SignatureHandlerLibrary::add(m);
1361 // The interpreter entry point checks the signature handler first,
1362 // before trying to fetch the native entry point and klass mirror.
1363 // We must set the signature handler last, so that multiple processors
1364 // preparing the same method will be sure to see non-null entry & mirror.
1365 IRT_END
1366
1367 #if defined(IA32) || defined(AMD64) || defined(ARM)
1368 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1369 if (src_address == dest_address) {
1370 return;
1371 }
1372 ResetNoHandleMark rnm; // In a LEAF entry.
1373 HandleMark hm;
1374 ResourceMark rm;
1375 frame fr = thread->last_frame();
1376 assert(fr.is_interpreted_frame(), "");
1377 jint bci = fr.interpreter_frame_bci();
1378 methodHandle mh(thread, fr.interpreter_frame_method());
1379 Bytecode_invoke invoke(mh, bci);
1380 ArgumentSizeComputer asc(invoke.signature());
1381 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1382 Copy::conjoint_jbytes(src_address, dest_address,
1383 size_of_arguments * Interpreter::stackElementSize);
1384 IRT_END
1385 #endif
1386
1387 #if INCLUDE_JVMTI
1388 // This is a support of the JVMTI PopFrame interface.
1389 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1390 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1391 // The member_name argument is a saved reference (in local#0) to the member_name.
1392 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1393 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1394 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1395 Method* method, address bcp))
1396 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1397 if (code != Bytecodes::_invokestatic) {
1398 return;
1399 }
1400 ConstantPool* cpool = method->constants();
1401 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1402 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1403 Symbol* mname = cpool->name_ref_at(cp_index);
1404
1405 if (MethodHandles::has_member_arg(cname, mname)) {
1406 oop member_name_oop = (oop) member_name;
1407 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1408 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1409 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1410 }
1411 thread->set_vm_result(member_name_oop);
1412 } else {
1413 thread->set_vm_result(NULL);
1414 }
1415 IRT_END
1416 #endif // INCLUDE_JVMTI
1417
1418 #ifndef PRODUCT
1419 // This must be a IRT_LEAF function because the interpreter must save registers on x86 to
1420 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1421 // The generated code still uses call_VM because that will set up the frame pointer for
1422 // bcp and method.
1423 IRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1424 const frame f = thread->last_frame();
1425 assert(f.is_interpreted_frame(), "must be an interpreted frame");
1426 methodHandle mh(thread, f.interpreter_frame_method());
1427 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
1428 return preserve_this_value;
1429 IRT_END
1430 #endif // !PRODUCT