1 /*
2 * Copyright (c) 1997, 2016, 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 "code/codeCacheExtensions.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "gc/shared/collectedHeap.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "interpreter/interpreterRuntime.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "interpreter/templateTable.hpp"
38 #include "logging/log.hpp"
39 #include "memory/oopFactory.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 "oops/valueKlass.hpp"
49 #include "oops/valueArrayKlass.hpp"
50 #include "oops/valueArrayOop.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "prims/nativeLookup.hpp"
53 #include "runtime/atomic.inline.hpp"
54 #include "runtime/biasedLocking.hpp"
55 #include "runtime/compilationPolicy.hpp"
56 #include "runtime/deoptimization.hpp"
57 #include "runtime/fieldDescriptor.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/icache.hpp"
60 #include "runtime/interfaceSupport.hpp"
61 #include "runtime/java.hpp"
62 #include "runtime/jfieldIDWorkaround.hpp"
63 #include "runtime/osThread.hpp"
64 #include "runtime/sharedRuntime.hpp"
65 #include "runtime/stubRoutines.hpp"
66 #include "runtime/synchronizer.hpp"
67 #include "runtime/threadCritical.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/globalDefinitions.hpp"
70 #ifdef COMPILER2
71 #include "opto/runtime.hpp"
72 #endif
73
74 class UnlockFlagSaver {
75 private:
76 JavaThread* _thread;
77 bool _do_not_unlock;
78 public:
79 UnlockFlagSaver(JavaThread* t) {
80 _thread = t;
81 _do_not_unlock = t->do_not_unlock_if_synchronized();
82 t->set_do_not_unlock_if_synchronized(false);
83 }
84 ~UnlockFlagSaver() {
85 _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
86 }
87 };
88
89 //------------------------------------------------------------------------------------------------------------------------
90 // State accessors
91
92 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
93 last_frame(thread).interpreter_frame_set_bcp(bcp);
94 if (ProfileInterpreter) {
95 // ProfileTraps uses MDOs independently of ProfileInterpreter.
96 // That is why we must check both ProfileInterpreter and mdo != NULL.
97 MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
98 if (mdo != NULL) {
99 NEEDS_CLEANUP;
100 last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
101 }
102 }
103 }
104
105 //------------------------------------------------------------------------------------------------------------------------
106 // Constants
107
108
109 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
110 // access constant pool
111 ConstantPool* pool = method(thread)->constants();
112 int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
113 constantTag tag = pool->tag_at(index);
114
115 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
116 Klass* klass = pool->klass_at(index, CHECK);
117 oop java_class = klass->java_mirror();
118 thread->set_vm_result(java_class);
119 IRT_END
120
121 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
122 assert(bytecode == Bytecodes::_fast_aldc ||
123 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
124 ResourceMark rm(thread);
125 methodHandle m (thread, method(thread));
126 Bytecode_loadconstant ldc(m, bci(thread));
127 oop result = ldc.resolve_constant(CHECK);
128 #ifdef ASSERT
129 {
130 // The bytecode wrappers aren't GC-safe so construct a new one
131 Bytecode_loadconstant ldc2(m, bci(thread));
132 oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
133 assert(result == coop, "expected result for assembly code");
134 }
135 #endif
136 thread->set_vm_result(result);
137 }
138 IRT_END
139
140
141 //------------------------------------------------------------------------------------------------------------------------
142 // Allocation
143
144 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
145 Klass* k_oop = pool->klass_at(index, CHECK);
146 instanceKlassHandle klass (THREAD, k_oop);
147
148 // Make sure we are not instantiating an abstract klass
149 klass->check_valid_for_instantiation(true, CHECK);
150
151 // Make sure klass is initialized
152 klass->initialize(CHECK);
153
154 // At this point the class may not be fully initialized
155 // because of recursive initialization. If it is fully
156 // initialized & has_finalized is not set, we rewrite
157 // it into its fast version (Note: no locking is needed
158 // here since this is an atomic byte write and can be
159 // done more than once).
160 //
161 // Note: In case of classes with has_finalized we don't
162 // rewrite since that saves us an extra check in
163 // the fast version which then would call the
164 // slow version anyway (and do a call back into
165 // Java).
166 // If we have a breakpoint, then we don't rewrite
167 // because the _breakpoint bytecode would be lost.
168 oop obj = klass->allocate_instance(CHECK);
169 thread->set_vm_result(obj);
170 IRT_END
171
172 void copy_primitive_argument(HeapWord* addr, Handle instance, int offset, BasicType type) {
173 switch (type) {
174 case T_BOOLEAN:
175 instance()->bool_field_put(offset, (jboolean)*((int*)addr));
176 break;
177 case T_CHAR:
178 instance()->char_field_put(offset, (jchar) *((int*)addr));
179 break;
180 case T_FLOAT:
181 instance()->float_field_put(offset, (jfloat)*((float*)addr));
182 break;
183 case T_DOUBLE:
184 instance()->double_field_put(offset, (jdouble)*((double*)addr));
185 break;
186 case T_BYTE:
187 instance()->byte_field_put(offset, (jbyte)*((int*)addr));
188 break;
189 case T_SHORT:
190 instance()->short_field_put(offset, (jshort)*((int*)addr));
191 break;
192 case T_INT:
193 instance()->int_field_put(offset, (jint)*((int*)addr));
194 break;
195 case T_LONG:
196 instance()->long_field_put(offset, (jlong)*((long*)addr)); // Is it correct on 32 and 64 bits?
197 break;
198 case T_OBJECT:
199 case T_ARRAY:
200 fatal("Not supported yet");
201 break;
202 case T_VALUETYPE:
203 fatal("Should not be handled with this method");
204 break;
205 default:
206 fatal("Unsupported BasicType");
207 }
208 }
209
210 IRT_ENTRY(int, InterpreterRuntime::_vnew(JavaThread* thread, ConstantPool* pool, int index, address sp))
211 valueKlassHandle vklass_h(ValueKlass::cast(pool->pool_holder()));
212 vklass_h->initialize(THREAD);
213 methodHandle factory_h(vklass_h->factory_method());
214
215 #ifdef DEBUG
216 assert(pool->tag_at(index).value() == JVM_CONSTANT_Methodref, "Invalid CP reference for factory");
217 int class_index = pool->uncached_klass_ref_index_at(index);
218 Symbol* classname = pool->klass_name_at(class_index);
219 assert(classname == vklass_h->name(), "klass mismatch in value factory description");
220 int method_index = pool->uncached_name_and_type_ref_index_at(index);
221 int method_name_index = pool->name_ref_index_at(method_index);
222 Symbol* method_name = pool->name_ref_at(method_name_index);
223 assert(method_name == factory_h->name(), "factory name mismatch");
224 #endif
225
226 if (factory_h() == NULL) {
227 THROW_0(vmSymbols::java_lang_InstantiationException());
228 }
229 int nargs = factory_h->constMethod()->valuefactory_parameter_mapping_length();
230 HeapWord* arg_ptr = (HeapWord*)sp;
231 int cursor = 0;
232 // allocate instance
233 instanceOop value = vklass_h->allocate_instance(CHECK_0);
234 Handle value_h = Handle(THREAD, value);
235 assert(value->is_value(), "Sanity check");
236 // Initializing fields
237 for (int i = nargs - 1 ; i >= 0 ; i--) {
238 int index = factory_h->constMethod()->valuefactory_parameter_mapping_start()[i].data.field_index;
239 int offset = vklass_h->field_offset(index);
240 Symbol* signature = vklass_h->field_signature(index);
241 BasicType type = vmSymbols::signature_type(signature);
242 if (type == T_OBJECT || type == T_ARRAY) {
243 #if 0
244 // Horrible hack to test oop map iterator...
245 value_h()->obj_field_put(offset, *(oop*)&arg_ptr[cursor]);
246 #else
247 fatal("Objects and arrays not supported in value types yet");
248 #endif
249 } else if (type == T_VALUETYPE) {
250 Symbol* field_klassname = SignatureStream(signature, false).as_symbol(CHECK_0);
251 // It would be better to have another way to retrieve the field klass
252 // than doing a lookup in the SystemDictionary
253 Klass* field_k = SystemDictionary::resolve_or_null(field_klassname,
254 Handle(vklass_h->class_loader()), Handle(vklass_h->protection_domain()), CHECK_0);
255 if (field_k == NULL) {
256 ResourceMark rm(THREAD);
257 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), vklass_h->field_name(index)->as_C_string());
258 }
259 ValueKlass* field_vk = ValueKlass::cast(field_k);
260 int size = field_vk->layout_helper_size_in_bytes(field_vk->layout_helper());
261 memcpy(((char*)(oopDesc*)value_h()) + offset,
262 (char*)(oopDesc*)*(oop*)&arg_ptr[cursor] + field_vk->first_field_offset(),
263 size - field_vk->first_field_offset());
264 } else {
265 copy_primitive_argument(&arg_ptr[cursor], value_h, offset, type);
266 }
267 if (type == T_LONG || type == T_DOUBLE) {
268 cursor += 2;
269 } else {
270 cursor += 1;
271 }
272 }
273 thread->set_vm_result(value);
274 // Note: don't forget to pop arguments out of the stack before pushing
275 // the result of the value creation
276 return cursor * Interpreter::stackElementSize;
277 IRT_END
278
279 IRT_ENTRY(void, InterpreterRuntime::qgetfield(JavaThread* thread, oopDesc* value, ConstantPoolCacheEntry* cp_entry))
280 Handle value_h(value);
281 assert(cp_entry->is_valuetype(), "Safety check");
282 instanceKlassHandle klass_h(cp_entry->f1_as_klass());
283 int offset = cp_entry->f2_as_index();
284
285 fieldDescriptor fd;
286 klass_h->find_field_from_offset(offset, false, &fd);
287 Symbol* field_signature = fd.signature();
288 Symbol* field_klassname = SignatureStream(field_signature, false).as_symbol(CHECK);
289 // It would be better to have another way to retrieve the field klass
290 // than doing a lookup in the SystemDictionary
291 Klass* field_k = SystemDictionary::resolve_or_null(field_klassname,
292 Handle(klass_h->class_loader()), Handle(klass_h->protection_domain()), CHECK);
293 if (field_k == NULL) {
294 ResourceMark rm(THREAD);
295 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), fd.name()->as_C_string());
296 }
297 valueKlassHandle field_vklass_h(field_k);
298 // allocate instance
299 instanceOop res = field_vklass_h->allocate_instance(CHECK);
300 // copy value
301 int size = field_vklass_h->layout_helper_size_in_bytes(field_vklass_h->layout_helper());
302 field_vklass_h->value_store(((char*)(oopDesc*)value_h()) + offset,
303 ((char*)(oopDesc*)res) + field_vklass_h->first_field_offset(),true, false);
304 thread->set_vm_result(res);
305 IRT_END
306
307 IRT_ENTRY(void, InterpreterRuntime::qputfield(JavaThread* thread, oopDesc* obj, oopDesc* value, ConstantPoolCacheEntry* cp_entry))
308 Handle value_h(value);
309 Handle obj_h(obj);
310 assert(cp_entry->is_valuetype(), "Safety check");
311 instanceKlassHandle klass_h(cp_entry->f1_as_klass());
312 int offset = cp_entry->f2_as_index();
313
314 fieldDescriptor fd;
315 klass_h->find_field_from_offset(offset, false, &fd);
316 Symbol* field_signature = fd.signature();
317 Symbol* field_klassname = SignatureStream(field_signature, false).as_symbol(CHECK);
318 // It would be better to have another way to retrieve the field klass
319 // than doing a lookup in the SystemDictionary
320 Klass* field_k = SystemDictionary::resolve_or_null(field_klassname,
321 Handle(klass_h->class_loader()), Handle(klass_h->protection_domain()), CHECK);
322 if (field_k == NULL) {
323 ResourceMark rm(THREAD);
324 THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), fd.name()->as_C_string());
325 }
326 valueKlassHandle field_vklass_h(field_k);
327 // copy value
328 int size = field_vklass_h->layout_helper_size_in_bytes(field_vklass_h->layout_helper());
329 field_vklass_h->value_store(((char*)(oopDesc*)value_h()) + offset,
330 ((char*)(oopDesc*)obj_h()) + cp_entry->f2_as_offset(), true, false);
331 IRT_END
332
333 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
334 oop obj = oopFactory::new_typeArray(type, size, CHECK);
335 thread->set_vm_result(obj);
336 IRT_END
337
338
339 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
340 // Note: no oopHandle for pool & klass needed since they are not used
341 // anymore after new_objArray() and no GC can happen before.
342 // (This may have to change if this code changes!)
343 Klass* klass = pool->klass_at(index, CHECK);
344 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
345 thread->set_vm_result(obj);
346
347 IRT_END
348 IRT_ENTRY(void, InterpreterRuntime::vnewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
349 Klass* klass = pool->klass_at(index, CHECK);
350 arrayOop obj = oopFactory::new_valueArray(klass, size, CHECK);
351 thread->set_vm_result(obj);
352 IRT_END
353
354 IRT_ENTRY(void, InterpreterRuntime::value_array_load(JavaThread* thread, arrayOopDesc* array, int index))
355 Klass* klass = array->klass();
356 assert(klass->is_valueArray_klass() || klass->is_objArray_klass(), "expected value or object array oop");
357
358 if (klass->is_objArray_klass()) {
359 thread->set_vm_result(((objArrayOop) array)->obj_at(index));
360 }
361 else {
362 // Early prototype: we don't have valorind support...just allocate aref and copy
363 ValueArrayKlass* vaklass = ValueArrayKlass::cast(klass);
364 valueKlassHandle vklass_h(vaklass->element_klass());;
365 arrayHandle ah(array);
366 instanceOop value_holder = vklass_h->allocate_instance(CHECK);
367 void* src = ((valueArrayOop)ah())->value_at_addr(index, vaklass->layout_helper());
368 vklass_h->value_store_to_oop(src, value_holder, true);
369 thread->set_vm_result(value_holder);
370 }
371 IRT_END
372
373 IRT_ENTRY(void, InterpreterRuntime::value_array_store(JavaThread* thread, arrayOopDesc* array, int index, void* val))
374 Klass* klass = array->klass();
375 assert(klass->is_valueArray_klass() || klass->is_objArray_klass(), "expected value or object array oop");
376 if (klass->is_objArray_klass()) {
377 ((objArrayOop) array)->obj_at_put(index, (oop)val);
378 }
379 else {
380 valueArrayOop varray = (valueArrayOop)array;
381 ValueArrayKlass* vaklass = ValueArrayKlass::cast(klass);
382 ValueKlass* vklass = vaklass->element_klass();
383 const int lh = vaklass->layout_helper();
384 vklass->value_store_from_oop((oop) val, varray->value_at_addr(index, lh), true, false);
385 }
386 IRT_END
387
388
389 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
390 // We may want to pass in more arguments - could make this slightly faster
391 ConstantPool* constants = method(thread)->constants();
392 int i = get_index_u2(thread, Bytecodes::_multianewarray);
393 Klass* klass = constants->klass_at(i, CHECK);
394 int nof_dims = number_of_dimensions(thread);
395 assert(klass->is_klass(), "not a class");
396 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
397
398 // We must create an array of jints to pass to multi_allocate.
399 ResourceMark rm(thread);
400 const int small_dims = 10;
401 jint dim_array[small_dims];
402 jint *dims = &dim_array[0];
403 if (nof_dims > small_dims) {
404 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
405 }
406 for (int index = 0; index < nof_dims; index++) {
407 // offset from first_size_address is addressed as local[index]
408 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
409 dims[index] = first_size_address[n];
410 }
411 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
412 thread->set_vm_result(obj);
413 IRT_END
414
415
416 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
417 assert(obj->is_oop(), "must be a valid oop");
418 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
419 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
420 IRT_END
421
422
423 // Quicken instance-of and check-cast bytecodes
424 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
425 // Force resolving; quicken the bytecode
426 int which = get_index_u2(thread, Bytecodes::_checkcast);
427 ConstantPool* cpool = method(thread)->constants();
428 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
429 // program we might have seen an unquick'd bytecode in the interpreter but have another
430 // thread quicken the bytecode before we get here.
431 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
432 Klass* klass = cpool->klass_at(which, CHECK);
433 thread->set_vm_result_2(klass);
434 IRT_END
435
436
437 //------------------------------------------------------------------------------------------------------------------------
438 // Exceptions
439
440 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,
441 methodHandle trap_method, int trap_bci, TRAPS) {
442 if (trap_method.not_null()) {
443 MethodData* trap_mdo = trap_method->method_data();
444 if (trap_mdo == NULL) {
445 Method::build_interpreter_method_data(trap_method, THREAD);
446 if (HAS_PENDING_EXCEPTION) {
447 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),
448 "we expect only an OOM error here");
449 CLEAR_PENDING_EXCEPTION;
450 }
451 trap_mdo = trap_method->method_data();
452 // and fall through...
453 }
454 if (trap_mdo != NULL) {
455 // Update per-method count of trap events. The interpreter
456 // is updating the MDO to simulate the effect of compiler traps.
457 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
458 }
459 }
460 }
461
462 // Assume the compiler is (or will be) interested in this event.
463 // If necessary, create an MDO to hold the information, and record it.
464 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
465 assert(ProfileTraps, "call me only if profiling");
466 methodHandle trap_method(thread, method(thread));
467 int trap_bci = trap_method->bci_from(bcp(thread));
468 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
469 }
470
471 #ifdef CC_INTERP
472 // As legacy note_trap, but we have more arguments.
473 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))
474 methodHandle trap_method(method);
475 note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);
476 IRT_END
477
478 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper
479 // for each exception.
480 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)
481 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }
482 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)
483 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }
484 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)
485 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }
486 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)
487 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }
488 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)
489 { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }
490 #endif // CC_INTERP
491
492
493 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
494 // get klass
495 InstanceKlass* klass = InstanceKlass::cast(k);
496 assert(klass->is_initialized(),
497 "this klass should have been initialized during VM initialization");
498 // create instance - do not call constructor since we may have no
499 // (java) stack space left (should assert constructor is empty)
500 Handle exception;
501 oop exception_oop = klass->allocate_instance(CHECK_(exception));
502 exception = Handle(THREAD, exception_oop);
503 if (StackTraceInThrowable) {
504 java_lang_Throwable::fill_in_stack_trace(exception);
505 }
506 return exception;
507 }
508
509 // Special handling for stack overflow: since we don't have any (java) stack
510 // space left we use the pre-allocated & pre-initialized StackOverflowError
511 // klass to create an stack overflow error instance. We do not call its
512 // constructor for the same reason (it is empty, anyway).
513 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
514 Handle exception = get_preinitialized_exception(
515 SystemDictionary::StackOverflowError_klass(),
516 CHECK);
517 // Increment counter for hs_err file reporting
518 Atomic::inc(&Exceptions::_stack_overflow_errors);
519 THROW_HANDLE(exception);
520 IRT_END
521
522 IRT_ENTRY(address, InterpreterRuntime::check_ReservedStackAccess_annotated_methods(JavaThread* thread))
523 frame fr = thread->last_frame();
524 assert(fr.is_java_frame(), "Must be a Java frame");
525 frame activation = SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
526 if (activation.sp() != NULL) {
527 thread->disable_stack_reserved_zone();
528 thread->set_reserved_stack_activation((address)activation.unextended_sp());
529 }
530 return (address)activation.sp();
531 IRT_END
532
533 IRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
534 Handle exception = get_preinitialized_exception(
535 SystemDictionary::StackOverflowError_klass(),
536 CHECK);
537 java_lang_Throwable::set_message(exception(),
538 Universe::delayed_stack_overflow_error_message());
539 // Increment counter for hs_err file reporting
540 Atomic::inc(&Exceptions::_stack_overflow_errors);
541 THROW_HANDLE(exception);
542 IRT_END
543
544 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
545 // lookup exception klass
546 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
547 if (ProfileTraps) {
548 if (s == vmSymbols::java_lang_ArithmeticException()) {
549 note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
550 } else if (s == vmSymbols::java_lang_NullPointerException()) {
551 note_trap(thread, Deoptimization::Reason_null_check, CHECK);
552 }
553 }
554 // create exception
555 Handle exception = Exceptions::new_exception(thread, s, message);
556 thread->set_vm_result(exception());
557 IRT_END
558
559
560 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
561 ResourceMark rm(thread);
562 const char* klass_name = obj->klass()->external_name();
563 // lookup exception klass
564 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
565 if (ProfileTraps) {
566 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
567 }
568 // create exception, with klass name as detail message
569 Handle exception = Exceptions::new_exception(thread, s, klass_name);
570 thread->set_vm_result(exception());
571 IRT_END
572
573
574 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
575 char message[jintAsStringSize];
576 // lookup exception klass
577 TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
578 if (ProfileTraps) {
579 note_trap(thread, Deoptimization::Reason_range_check, CHECK);
580 }
581 // create exception
582 sprintf(message, "%d", index);
583 THROW_MSG(s, message);
584 IRT_END
585
586 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
587 JavaThread* thread, oopDesc* obj))
588
589 ResourceMark rm(thread);
590 char* message = SharedRuntime::generate_class_cast_message(
591 thread, obj->klass()->external_name());
592
593 if (ProfileTraps) {
594 note_trap(thread, Deoptimization::Reason_class_check, CHECK);
595 }
596
597 // create exception
598 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
599 IRT_END
600
601 // exception_handler_for_exception(...) returns the continuation address,
602 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
603 // The exception oop is returned to make sure it is preserved over GC (it
604 // is only on the stack if the exception was thrown explicitly via athrow).
605 // During this operation, the expression stack contains the values for the
606 // bci where the exception happened. If the exception was propagated back
607 // from a call, the expression stack contains the values for the bci at the
608 // invoke w/o arguments (i.e., as if one were inside the call).
609 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
610
611 Handle h_exception(thread, exception);
612 methodHandle h_method (thread, method(thread));
613 constantPoolHandle h_constants(thread, h_method->constants());
614 bool should_repeat;
615 int handler_bci;
616 int current_bci = bci(thread);
617
618 if (thread->frames_to_pop_failed_realloc() > 0) {
619 // Allocation of scalar replaced object used in this frame
620 // failed. Unconditionally pop the frame.
621 thread->dec_frames_to_pop_failed_realloc();
622 thread->set_vm_result(h_exception());
623 // If the method is synchronized we already unlocked the monitor
624 // during deoptimization so the interpreter needs to skip it when
625 // the frame is popped.
626 thread->set_do_not_unlock_if_synchronized(true);
627 #ifdef CC_INTERP
628 return (address) -1;
629 #else
630 return Interpreter::remove_activation_entry();
631 #endif
632 }
633
634 // Need to do this check first since when _do_not_unlock_if_synchronized
635 // is set, we don't want to trigger any classloading which may make calls
636 // into java, or surprisingly find a matching exception handler for bci 0
637 // since at this moment the method hasn't been "officially" entered yet.
638 if (thread->do_not_unlock_if_synchronized()) {
639 ResourceMark rm;
640 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
641 thread->set_vm_result(exception);
642 #ifdef CC_INTERP
643 return (address) -1;
644 #else
645 return Interpreter::remove_activation_entry();
646 #endif
647 }
648
649 do {
650 should_repeat = false;
651
652 // assertions
653 #ifdef ASSERT
654 assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
655 assert(h_exception->is_oop(), "just checking");
656 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
657 if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
658 if (ExitVMOnVerifyError) vm_exit(-1);
659 ShouldNotReachHere();
660 }
661 #endif
662
663 // tracing
664 if (log_is_enabled(Info, exceptions)) {
665 ResourceMark rm(thread);
666 stringStream tempst;
667 tempst.print("interpreter method <%s>\n"
668 " at bci %d for thread " INTPTR_FORMAT,
669 h_method->print_value_string(), current_bci, p2i(thread));
670 Exceptions::log_exception(h_exception, tempst);
671 }
672 // Don't go paging in something which won't be used.
673 // else if (extable->length() == 0) {
674 // // disabled for now - interpreter is not using shortcut yet
675 // // (shortcut is not to call runtime if we have no exception handlers)
676 // // warning("performance bug: should not call runtime if method has no exception handlers");
677 // }
678 // for AbortVMOnException flag
679 Exceptions::debug_check_abort(h_exception);
680
681 // exception handler lookup
682 KlassHandle h_klass(THREAD, h_exception->klass());
683 handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD);
684 if (HAS_PENDING_EXCEPTION) {
685 // We threw an exception while trying to find the exception handler.
686 // Transfer the new exception to the exception handle which will
687 // be set into thread local storage, and do another lookup for an
688 // exception handler for this exception, this time starting at the
689 // BCI of the exception handler which caused the exception to be
690 // thrown (bug 4307310).
691 h_exception = Handle(THREAD, PENDING_EXCEPTION);
692 CLEAR_PENDING_EXCEPTION;
693 if (handler_bci >= 0) {
694 current_bci = handler_bci;
695 should_repeat = true;
696 }
697 }
698 } while (should_repeat == true);
699
700 #if INCLUDE_JVMCI
701 if (EnableJVMCI && h_method->method_data() != NULL) {
702 ResourceMark rm(thread);
703 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);
704 if (pdata != NULL && pdata->is_BitData()) {
705 BitData* bit_data = (BitData*) pdata;
706 bit_data->set_exception_seen();
707 }
708 }
709 #endif
710
711 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
712 // time throw or a stack unwinding throw and accordingly notify the debugger
713 if (JvmtiExport::can_post_on_exceptions()) {
714 JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
715 }
716
717 #ifdef CC_INTERP
718 address continuation = (address)(intptr_t) handler_bci;
719 #else
720 address continuation = NULL;
721 #endif
722 address handler_pc = NULL;
723 if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
724 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
725 // handler in this method, or (b) after a stack overflow there is not yet
726 // enough stack space available to reprotect the stack.
727 #ifndef CC_INTERP
728 continuation = Interpreter::remove_activation_entry();
729 #endif
730 // Count this for compilation purposes
731 h_method->interpreter_throwout_increment(THREAD);
732 } else {
733 // handler in this method => change bci/bcp to handler bci/bcp and continue there
734 handler_pc = h_method->code_base() + handler_bci;
735 #ifndef CC_INTERP
736 set_bcp_and_mdp(handler_pc, thread);
737 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
738 #endif
739 }
740 // notify debugger of an exception catch
741 // (this is good for exceptions caught in native methods as well)
742 if (JvmtiExport::can_post_on_exceptions()) {
743 JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
744 }
745
746 thread->set_vm_result(h_exception());
747 return continuation;
748 IRT_END
749
750
751 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
752 assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
753 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
754 IRT_END
755
756
757 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
758 THROW(vmSymbols::java_lang_AbstractMethodError());
759 IRT_END
760
761
762 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
763 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
764 IRT_END
765
766
767 //------------------------------------------------------------------------------------------------------------------------
768 // Fields
769 //
770
771 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) {
772 Thread* THREAD = thread;
773 // resolve field
774 fieldDescriptor info;
775 constantPoolHandle pool(thread, method(thread)->constants());
776 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
777 bytecode == Bytecodes::_putstatic);
778 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
779
780 {
781 JvmtiHideSingleStepping jhss(thread);
782 LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
783 bytecode, CHECK);
784 } // end JvmtiHideSingleStepping
785
786 // check if link resolution caused cpCache to be updated
787 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
788 if (cp_cache_entry->is_resolved(bytecode)) return;
789
790 // compute auxiliary field attributes
791 TosState state = as_TosState(info.field_type());
792
793 // We need to delay resolving put instructions on final fields
794 // until we actually invoke one. This is required so we throw
795 // exceptions at the correct place. If we do not resolve completely
796 // in the current pass, leaving the put_code set to zero will
797 // cause the next put instruction to reresolve.
798 Bytecodes::Code put_code = (Bytecodes::Code)0;
799
800 // We also need to delay resolving getstatic instructions until the
801 // class is intitialized. This is required so that access to the static
802 // field will call the initialization function every time until the class
803 // is completely initialized ala. in 2.17.5 in JVM Specification.
804 InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
805 bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
806 !klass->is_initialized());
807 Bytecodes::Code get_code = (Bytecodes::Code)0;
808
809 if (!uninitialized_static) {
810 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
811 if (is_put || !info.access_flags().is_final()) {
812 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
813 }
814 }
815
816 cp_cache_entry->set_field(
817 get_code,
818 put_code,
819 info.field_holder(),
820 info.index(),
821 info.offset(),
822 state,
823 info.access_flags().is_final(),
824 info.access_flags().is_volatile(),
825 pool->pool_holder()
826 );
827 }
828
829
830 //------------------------------------------------------------------------------------------------------------------------
831 // Synchronization
832 //
833 // The interpreter's synchronization code is factored out so that it can
834 // be shared by method invocation and synchronized blocks.
835 //%note synchronization_3
836
837 //%note monitor_1
838 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
839 #ifdef ASSERT
840 thread->last_frame().interpreter_frame_verify_monitor(elem);
841 #endif
842 if (PrintBiasedLockingStatistics) {
843 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
844 }
845 Handle h_obj(thread, elem->obj());
846 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
847 "must be NULL or an object");
848 if (UseBiasedLocking) {
849 // Retry fast entry if bias is revoked to avoid unnecessary inflation
850 ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
851 } else {
852 ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
853 }
854 assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
855 "must be NULL or an object");
856 #ifdef ASSERT
857 thread->last_frame().interpreter_frame_verify_monitor(elem);
858 #endif
859 IRT_END
860
861
862 //%note monitor_1
863 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
864 #ifdef ASSERT
865 thread->last_frame().interpreter_frame_verify_monitor(elem);
866 #endif
867 Handle h_obj(thread, elem->obj());
868 assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
869 "must be NULL or an object");
870 if (elem == NULL || h_obj()->is_unlocked()) {
871 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
872 }
873 ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
874 // Free entry. This must be done here, since a pending exception might be installed on
875 // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
876 elem->set_obj(NULL);
877 #ifdef ASSERT
878 thread->last_frame().interpreter_frame_verify_monitor(elem);
879 #endif
880 IRT_END
881
882
883 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
884 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
885 IRT_END
886
887
888 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
889 // Returns an illegal exception to install into the current thread. The
890 // pending_exception flag is cleared so normal exception handling does not
891 // trigger. Any current installed exception will be overwritten. This
892 // method will be called during an exception unwind.
893
894 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
895 Handle exception(thread, thread->vm_result());
896 assert(exception() != NULL, "vm result should be set");
897 thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
898 if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
899 exception = get_preinitialized_exception(
900 SystemDictionary::IllegalMonitorStateException_klass(),
901 CATCH);
902 }
903 thread->set_vm_result(exception());
904 IRT_END
905
906
907 //------------------------------------------------------------------------------------------------------------------------
908 // Invokes
909
910 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
911 return method->orig_bytecode_at(method->bci_from(bcp));
912 IRT_END
913
914 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
915 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
916 IRT_END
917
918 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
919 JvmtiExport::post_raw_breakpoint(thread, method, bcp);
920 IRT_END
921
922 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) {
923 Thread* THREAD = thread;
924 // extract receiver from the outgoing argument list if necessary
925 Handle receiver(thread, NULL);
926 if (bytecode == Bytecodes::_invokevirtual ||
927 bytecode == Bytecodes::_invokeinterface ||
928 bytecode == Bytecodes::_invokedirect) {
929 ResourceMark rm(thread);
930 methodHandle m (thread, method(thread));
931 Bytecode_invoke call(m, bci(thread));
932 Symbol* signature = call.signature();
933 receiver = Handle(thread,
934 thread->last_frame().interpreter_callee_receiver(signature));
935 assert(Universe::heap()->is_in_reserved_or_null(receiver()),
936 "sanity check");
937 assert(receiver.is_null() ||
938 !Universe::heap()->is_in_reserved(receiver->klass()),
939 "sanity check");
940 }
941
942 // resolve method
943 CallInfo info;
944 constantPoolHandle pool(thread, method(thread)->constants());
945
946 {
947 JvmtiHideSingleStepping jhss(thread);
948 LinkResolver::resolve_invoke(info, receiver, pool,
949 get_index_u2_cpcache(thread, bytecode), bytecode,
950 CHECK);
951 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
952 int retry_count = 0;
953 while (info.resolved_method()->is_old()) {
954 // It is very unlikely that method is redefined more than 100 times
955 // in the middle of resolve. If it is looping here more than 100 times
956 // means then there could be a bug here.
957 guarantee((retry_count++ < 100),
958 "Could not resolve to latest version of redefined method");
959 // method is redefined in the middle of resolve so re-try.
960 LinkResolver::resolve_invoke(info, receiver, pool,
961 get_index_u2_cpcache(thread, bytecode), bytecode,
962 CHECK);
963 }
964 }
965 } // end JvmtiHideSingleStepping
966
967 // check if link resolution caused cpCache to be updated
968 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
969 if (cp_cache_entry->is_resolved(bytecode)) return;
970
971 #ifdef ASSERT
972 if (bytecode == Bytecodes::_invokeinterface) {
973 if (info.resolved_method()->method_holder() ==
974 SystemDictionary::Object_klass()) {
975 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
976 // (see also CallInfo::set_interface for details)
977 assert(info.call_kind() == CallInfo::vtable_call ||
978 info.call_kind() == CallInfo::direct_call, "");
979 methodHandle rm = info.resolved_method();
980 assert(rm->is_final() || info.has_vtable_index(),
981 "should have been set already");
982 } else if (!info.resolved_method()->has_itable_index()) {
983 // Resolved something like CharSequence.toString. Use vtable not itable.
984 assert(info.call_kind() != CallInfo::itable_call, "");
985 } else {
986 // Setup itable entry
987 assert(info.call_kind() == CallInfo::itable_call, "");
988 int index = info.resolved_method()->itable_index();
989 assert(info.itable_index() == index, "");
990 }
991 } else {
992 assert(info.call_kind() == CallInfo::direct_call ||
993 info.call_kind() == CallInfo::vtable_call, "");
994 }
995 #endif
996 switch (info.call_kind()) {
997 case CallInfo::direct_call:
998 cp_cache_entry->set_direct_call(
999 bytecode,
1000 info.resolved_method());
1001 break;
1002 case CallInfo::vtable_call:
1003 cp_cache_entry->set_vtable_call(
1004 bytecode,
1005 info.resolved_method(),
1006 info.vtable_index());
1007 break;
1008 case CallInfo::itable_call:
1009 cp_cache_entry->set_itable_call(
1010 bytecode,
1011 info.resolved_method(),
1012 info.itable_index());
1013 break;
1014 default: ShouldNotReachHere();
1015 }
1016 }
1017
1018
1019 // First time execution: Resolve symbols, create a permanent MethodType object.
1020 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) {
1021 Thread* THREAD = thread;
1022 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
1023
1024 // resolve method
1025 CallInfo info;
1026 constantPoolHandle pool(thread, method(thread)->constants());
1027 {
1028 JvmtiHideSingleStepping jhss(thread);
1029 LinkResolver::resolve_invoke(info, Handle(), pool,
1030 get_index_u2_cpcache(thread, bytecode), bytecode,
1031 CHECK);
1032 } // end JvmtiHideSingleStepping
1033
1034 ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);
1035 cp_cache_entry->set_method_handle(pool, info);
1036 }
1037
1038 // First time execution: Resolve symbols, create a permanent CallSite object.
1039 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) {
1040 Thread* THREAD = thread;
1041 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
1042
1043 //TO DO: consider passing BCI to Java.
1044 // int caller_bci = method(thread)->bci_from(bcp(thread));
1045
1046 // resolve method
1047 CallInfo info;
1048 constantPoolHandle pool(thread, method(thread)->constants());
1049 int index = get_index_u4(thread, bytecode);
1050 {
1051 JvmtiHideSingleStepping jhss(thread);
1052 LinkResolver::resolve_invoke(info, Handle(), pool,
1053 index, bytecode, CHECK);
1054 } // end JvmtiHideSingleStepping
1055
1056 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
1057 cp_cache_entry->set_dynamic_call(pool, info);
1058 }
1059
1060 // This function is the interface to the assembly code. It returns the resolved
1061 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
1062 // This function will check for redefinition!
1063 IRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) {
1064 switch (bytecode) {
1065 case Bytecodes::_getstatic:
1066 case Bytecodes::_putstatic:
1067 case Bytecodes::_getfield:
1068 case Bytecodes::_putfield:
1069 case Bytecodes::_vgetfield:
1070 resolve_get_put(thread, bytecode);
1071 break;
1072 case Bytecodes::_invokevirtual:
1073 case Bytecodes::_invokedirect:
1074 case Bytecodes::_invokespecial:
1075 case Bytecodes::_invokestatic:
1076 case Bytecodes::_invokeinterface:
1077 resolve_invoke(thread, bytecode);
1078 break;
1079 case Bytecodes::_invokehandle:
1080 resolve_invokehandle(thread);
1081 break;
1082 case Bytecodes::_invokedynamic:
1083 resolve_invokedynamic(thread);
1084 break;
1085 default:
1086 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1087 break;
1088 }
1089 }
1090 IRT_END
1091
1092 //------------------------------------------------------------------------------------------------------------------------
1093 // Miscellaneous
1094
1095
1096 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
1097 nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
1098 assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
1099 if (branch_bcp != NULL && nm != NULL) {
1100 // This was a successful request for an OSR nmethod. Because
1101 // frequency_counter_overflow_inner ends with a safepoint check,
1102 // nm could have been unloaded so look it up again. It's unsafe
1103 // to examine nm directly since it might have been freed and used
1104 // for something else.
1105 frame fr = thread->last_frame();
1106 Method* method = fr.interpreter_frame_method();
1107 int bci = method->bci_from(fr.interpreter_frame_bcp());
1108 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1109 }
1110 #ifndef PRODUCT
1111 if (TraceOnStackReplacement) {
1112 if (nm != NULL) {
1113 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1114 nm->print();
1115 }
1116 }
1117 #endif
1118 return nm;
1119 }
1120
1121 IRT_ENTRY(nmethod*,
1122 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
1123 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1124 // flag, in case this method triggers classloading which will call into Java.
1125 UnlockFlagSaver fs(thread);
1126
1127 frame fr = thread->last_frame();
1128 assert(fr.is_interpreted_frame(), "must come from interpreter");
1129 methodHandle method(thread, fr.interpreter_frame_method());
1130 const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
1131 const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
1132
1133 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
1134 nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
1135 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
1136
1137 if (osr_nm != NULL) {
1138 // We may need to do on-stack replacement which requires that no
1139 // monitors in the activation are biased because their
1140 // BasicObjectLocks will need to migrate during OSR. Force
1141 // unbiasing of all monitors in the activation now (even though
1142 // the OSR nmethod might be invalidated) because we don't have a
1143 // safepoint opportunity later once the migration begins.
1144 if (UseBiasedLocking) {
1145 ResourceMark rm;
1146 GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
1147 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
1148 kptr < fr.interpreter_frame_monitor_begin();
1149 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
1150 if( kptr->obj() != NULL ) {
1151 objects_to_revoke->append(Handle(THREAD, kptr->obj()));
1152 }
1153 }
1154 BiasedLocking::revoke(objects_to_revoke);
1155 }
1156 }
1157 return osr_nm;
1158 IRT_END
1159
1160 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1161 assert(ProfileInterpreter, "must be profiling interpreter");
1162 int bci = method->bci_from(cur_bcp);
1163 MethodData* mdo = method->method_data();
1164 if (mdo == NULL) return 0;
1165 return mdo->bci_to_di(bci);
1166 IRT_END
1167
1168 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
1169 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1170 // flag, in case this method triggers classloading which will call into Java.
1171 UnlockFlagSaver fs(thread);
1172
1173 assert(ProfileInterpreter, "must be profiling interpreter");
1174 frame fr = thread->last_frame();
1175 assert(fr.is_interpreted_frame(), "must come from interpreter");
1176 methodHandle method(thread, fr.interpreter_frame_method());
1177 Method::build_interpreter_method_data(method, THREAD);
1178 if (HAS_PENDING_EXCEPTION) {
1179 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1180 CLEAR_PENDING_EXCEPTION;
1181 // and fall through...
1182 }
1183 IRT_END
1184
1185
1186 #ifdef ASSERT
1187 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1188 assert(ProfileInterpreter, "must be profiling interpreter");
1189
1190 MethodData* mdo = method->method_data();
1191 assert(mdo != NULL, "must not be null");
1192
1193 int bci = method->bci_from(bcp);
1194
1195 address mdp2 = mdo->bci_to_dp(bci);
1196 if (mdp != mdp2) {
1197 ResourceMark rm;
1198 ResetNoHandleMark rnm; // In a LEAF entry.
1199 HandleMark hm;
1200 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1201 int current_di = mdo->dp_to_di(mdp);
1202 int expected_di = mdo->dp_to_di(mdp2);
1203 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1204 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1205 int approx_bci = -1;
1206 if (current_di >= 0) {
1207 approx_bci = mdo->data_at(current_di)->bci();
1208 }
1209 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1210 mdo->print_on(tty);
1211 method->print_codes();
1212 }
1213 assert(mdp == mdp2, "wrong mdp");
1214 IRT_END
1215 #endif // ASSERT
1216
1217 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
1218 assert(ProfileInterpreter, "must be profiling interpreter");
1219 ResourceMark rm(thread);
1220 HandleMark hm(thread);
1221 frame fr = thread->last_frame();
1222 assert(fr.is_interpreted_frame(), "must come from interpreter");
1223 MethodData* h_mdo = fr.interpreter_frame_method()->method_data();
1224
1225 // Grab a lock to ensure atomic access to setting the return bci and
1226 // the displacement. This can block and GC, invalidating all naked oops.
1227 MutexLocker ml(RetData_lock);
1228
1229 // ProfileData is essentially a wrapper around a derived oop, so we
1230 // need to take the lock before making any ProfileData structures.
1231 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
1232 RetData* rdata = data->as_RetData();
1233 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1234 fr.interpreter_frame_set_mdp(new_mdp);
1235 IRT_END
1236
1237 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))
1238 MethodCounters* mcs = Method::build_method_counters(m, thread);
1239 if (HAS_PENDING_EXCEPTION) {
1240 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1241 CLEAR_PENDING_EXCEPTION;
1242 }
1243 return mcs;
1244 IRT_END
1245
1246
1247 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
1248 // We used to need an explict preserve_arguments here for invoke bytecodes. However,
1249 // stack traversal automatically takes care of preserving arguments for invoke, so
1250 // this is no longer needed.
1251
1252 // IRT_END does an implicit safepoint check, hence we are guaranteed to block
1253 // if this is called during a safepoint
1254
1255 if (JvmtiExport::should_post_single_step()) {
1256 // We are called during regular safepoints and when the VM is
1257 // single stepping. If any thread is marked for single stepping,
1258 // then we may have JVMTI work to do.
1259 JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
1260 }
1261 IRT_END
1262
1263 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
1264 ConstantPoolCacheEntry *cp_entry))
1265
1266 // check the access_flags for the field in the klass
1267
1268 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1269 int index = cp_entry->field_index();
1270 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1271
1272 bool is_static = (obj == NULL);
1273 HandleMark hm(thread);
1274
1275 Handle h_obj;
1276 if (!is_static) {
1277 // non-static field accessors have an object, but we need a handle
1278 h_obj = Handle(thread, obj);
1279 }
1280 instanceKlassHandle h_cp_entry_f1(thread, (Klass*)cp_entry->f1_as_klass());
1281 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static);
1282 JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
1283 IRT_END
1284
1285 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1286 oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1287
1288 Klass* k = (Klass*)cp_entry->f1_as_klass();
1289
1290 // check the access_flags for the field in the klass
1291 InstanceKlass* ik = InstanceKlass::cast(k);
1292 int index = cp_entry->field_index();
1293 // bail out if field modifications are not watched
1294 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1295
1296 char sig_type = '\0';
1297
1298 switch(cp_entry->flag_state()) {
1299 case btos: sig_type = 'Z'; break;
1300 case ctos: sig_type = 'C'; break;
1301 case stos: sig_type = 'S'; break;
1302 case itos: sig_type = 'I'; break;
1303 case ftos: sig_type = 'F'; break;
1304 case atos: sig_type = 'L'; break;
1305 case ltos: sig_type = 'J'; break;
1306 case dtos: sig_type = 'D'; break;
1307 default: ShouldNotReachHere(); return;
1308 }
1309 bool is_static = (obj == NULL);
1310
1311 HandleMark hm(thread);
1312 instanceKlassHandle h_klass(thread, k);
1313 jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static);
1314 jvalue fvalue;
1315 #ifdef _LP64
1316 fvalue = *value;
1317 #else
1318 // Long/double values are stored unaligned and also noncontiguously with
1319 // tagged stacks. We can't just do a simple assignment even in the non-
1320 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1321 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1322 // We assume that the two halves of longs/doubles are stored in interpreter
1323 // stack slots in platform-endian order.
1324 jlong_accessor u;
1325 jint* newval = (jint*)value;
1326 u.words[0] = newval[0];
1327 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1328 fvalue.j = u.long_value;
1329 #endif // _LP64
1330
1331 Handle h_obj;
1332 if (!is_static) {
1333 // non-static field accessors have an object, but we need a handle
1334 h_obj = Handle(thread, obj);
1335 }
1336
1337 JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1338 fid, sig_type, &fvalue);
1339 IRT_END
1340
1341 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1342 JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1343 IRT_END
1344
1345
1346 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1347 JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1348 IRT_END
1349
1350 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1351 {
1352 return (Interpreter::contains(pc) ? 1 : 0);
1353 }
1354 IRT_END
1355
1356
1357 // Implementation of SignatureHandlerLibrary
1358
1359 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1360 // Dummy definition (else normalization method is defined in CPU
1361 // dependant code)
1362 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1363 return fingerprint;
1364 }
1365 #endif
1366
1367 address SignatureHandlerLibrary::set_handler_blob() {
1368 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1369 if (handler_blob == NULL) {
1370 return NULL;
1371 }
1372 address handler = handler_blob->code_begin();
1373 _handler_blob = handler_blob;
1374 _handler = handler;
1375 return handler;
1376 }
1377
1378 void SignatureHandlerLibrary::initialize() {
1379 if (_fingerprints != NULL) {
1380 return;
1381 }
1382 if (set_handler_blob() == NULL) {
1383 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1384 }
1385
1386 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1387 SignatureHandlerLibrary::buffer_size);
1388 _buffer = bb->code_begin();
1389
1390 _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1391 _handlers = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1392 }
1393
1394 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1395 address handler = _handler;
1396 int insts_size = buffer->pure_insts_size();
1397 if (handler + insts_size > _handler_blob->code_end()) {
1398 // get a new handler blob
1399 handler = set_handler_blob();
1400 }
1401 if (handler != NULL) {
1402 memcpy(handler, buffer->insts_begin(), insts_size);
1403 pd_set_handler(handler);
1404 ICache::invalidate_range(handler, insts_size);
1405 _handler = handler + insts_size;
1406 }
1407 CodeCacheExtensions::handle_generated_handler(handler, buffer->name(), _handler);
1408 return handler;
1409 }
1410
1411 void SignatureHandlerLibrary::add(const methodHandle& method) {
1412 if (method->signature_handler() == NULL) {
1413 // use slow signature handler if we can't do better
1414 int handler_index = -1;
1415 // check if we can use customized (fast) signature handler
1416 if (UseFastSignatureHandlers && CodeCacheExtensions::support_fast_signature_handlers() && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1417 // use customized signature handler
1418 MutexLocker mu(SignatureHandlerLibrary_lock);
1419 // make sure data structure is initialized
1420 initialize();
1421 // lookup method signature's fingerprint
1422 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1423 // allow CPU dependant code to optimize the fingerprints for the fast handler
1424 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1425 handler_index = _fingerprints->find(fingerprint);
1426 // create handler if necessary
1427 if (handler_index < 0) {
1428 ResourceMark rm;
1429 ptrdiff_t align_offset = (address)
1430 round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1431 CodeBuffer buffer((address)(_buffer + align_offset),
1432 SignatureHandlerLibrary::buffer_size - align_offset);
1433 if (!CodeCacheExtensions::support_dynamic_code()) {
1434 // we need a name for the signature (for lookups or saving)
1435 const int SYMBOL_SIZE = 50;
1436 char *symbolName = NEW_RESOURCE_ARRAY(char, SYMBOL_SIZE);
1437 // support for named signatures
1438 jio_snprintf(symbolName, SYMBOL_SIZE,
1439 "native_" UINT64_FORMAT, fingerprint);
1440 buffer.set_name(symbolName);
1441 }
1442 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1443 // copy into code heap
1444 address handler = set_handler(&buffer);
1445 if (handler == NULL) {
1446 // use slow signature handler (without memorizing it in the fingerprints)
1447 } else {
1448 // debugging suppport
1449 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1450 ttyLocker ttyl;
1451 tty->cr();
1452 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1453 _handlers->length(),
1454 (method->is_static() ? "static" : "receiver"),
1455 method->name_and_sig_as_C_string(),
1456 fingerprint,
1457 buffer.insts_size());
1458 if (buffer.insts_size() > 0) {
1459 // buffer may be empty for pregenerated handlers
1460 Disassembler::decode(handler, handler + buffer.insts_size());
1461 }
1462 #ifndef PRODUCT
1463 address rh_begin = Interpreter::result_handler(method()->result_type());
1464 if (CodeCache::contains(rh_begin)) {
1465 // else it might be special platform dependent values
1466 tty->print_cr(" --- associated result handler ---");
1467 address rh_end = rh_begin;
1468 while (*(int*)rh_end != 0) {
1469 rh_end += sizeof(int);
1470 }
1471 Disassembler::decode(rh_begin, rh_end);
1472 } else {
1473 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1474 }
1475 #endif
1476 }
1477 // add handler to library
1478 _fingerprints->append(fingerprint);
1479 _handlers->append(handler);
1480 // set handler index
1481 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1482 handler_index = _fingerprints->length() - 1;
1483 }
1484 }
1485 // Set handler under SignatureHandlerLibrary_lock
1486 if (handler_index < 0) {
1487 // use generic signature handler
1488 method->set_signature_handler(Interpreter::slow_signature_handler());
1489 } else {
1490 // set handler
1491 method->set_signature_handler(_handlers->at(handler_index));
1492 }
1493 } else {
1494 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1495 // use generic signature handler
1496 method->set_signature_handler(Interpreter::slow_signature_handler());
1497 }
1498 }
1499 #ifdef ASSERT
1500 int handler_index = -1;
1501 int fingerprint_index = -2;
1502 {
1503 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1504 // in any way if accessed from multiple threads. To avoid races with another
1505 // thread which may change the arrays in the above, mutex protected block, we
1506 // have to protect this read access here with the same mutex as well!
1507 MutexLocker mu(SignatureHandlerLibrary_lock);
1508 if (_handlers != NULL) {
1509 handler_index = _handlers->find(method->signature_handler());
1510 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1511 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1512 fingerprint_index = _fingerprints->find(fingerprint);
1513 }
1514 }
1515 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1516 handler_index == fingerprint_index, "sanity check");
1517 #endif // ASSERT
1518 }
1519
1520 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1521 int handler_index = -1;
1522 // use customized signature handler
1523 MutexLocker mu(SignatureHandlerLibrary_lock);
1524 // make sure data structure is initialized
1525 initialize();
1526 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1527 handler_index = _fingerprints->find(fingerprint);
1528 // create handler if necessary
1529 if (handler_index < 0) {
1530 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1531 tty->cr();
1532 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1533 _handlers->length(),
1534 p2i(handler),
1535 fingerprint);
1536 }
1537 _fingerprints->append(fingerprint);
1538 _handlers->append(handler);
1539 } else {
1540 if (PrintSignatureHandlers) {
1541 tty->cr();
1542 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1543 _handlers->length(),
1544 fingerprint,
1545 p2i(_handlers->at(handler_index)),
1546 p2i(handler));
1547 }
1548 }
1549 }
1550
1551
1552 BufferBlob* SignatureHandlerLibrary::_handler_blob = NULL;
1553 address SignatureHandlerLibrary::_handler = NULL;
1554 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1555 GrowableArray<address>* SignatureHandlerLibrary::_handlers = NULL;
1556 address SignatureHandlerLibrary::_buffer = NULL;
1557
1558
1559 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, Method* method))
1560 methodHandle m(thread, method);
1561 assert(m->is_native(), "sanity check");
1562 // lookup native function entry point if it doesn't exist
1563 bool in_base_library;
1564 if (!m->has_native_function()) {
1565 NativeLookup::lookup(m, in_base_library, CHECK);
1566 }
1567 // make sure signature handler is installed
1568 SignatureHandlerLibrary::add(m);
1569 // The interpreter entry point checks the signature handler first,
1570 // before trying to fetch the native entry point and klass mirror.
1571 // We must set the signature handler last, so that multiple processors
1572 // preparing the same method will be sure to see non-null entry & mirror.
1573 IRT_END
1574
1575 #if defined(IA32) || defined(AMD64) || defined(ARM)
1576 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1577 if (src_address == dest_address) {
1578 return;
1579 }
1580 ResetNoHandleMark rnm; // In a LEAF entry.
1581 HandleMark hm;
1582 ResourceMark rm;
1583 frame fr = thread->last_frame();
1584 assert(fr.is_interpreted_frame(), "");
1585 jint bci = fr.interpreter_frame_bci();
1586 methodHandle mh(thread, fr.interpreter_frame_method());
1587 Bytecode_invoke invoke(mh, bci);
1588 ArgumentSizeComputer asc(invoke.signature());
1589 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1590 Copy::conjoint_jbytes(src_address, dest_address,
1591 size_of_arguments * Interpreter::stackElementSize);
1592 IRT_END
1593 #endif
1594
1595 #if INCLUDE_JVMTI
1596 // This is a support of the JVMTI PopFrame interface.
1597 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1598 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1599 // The member_name argument is a saved reference (in local#0) to the member_name.
1600 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1601 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1602 IRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* thread, address member_name,
1603 Method* method, address bcp))
1604 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1605 if (code != Bytecodes::_invokestatic) {
1606 return;
1607 }
1608 ConstantPool* cpool = method->constants();
1609 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1610 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1611 Symbol* mname = cpool->name_ref_at(cp_index);
1612
1613 if (MethodHandles::has_member_arg(cname, mname)) {
1614 oop member_name_oop = (oop) member_name;
1615 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1616 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1617 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1618 }
1619 thread->set_vm_result(member_name_oop);
1620 } else {
1621 thread->set_vm_result(NULL);
1622 }
1623 IRT_END
1624 #endif // INCLUDE_JVMTI