1 /*
2 * Copyright (c) 1997, 2023, 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/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "compiler/compilationPolicy.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/disassembler.hpp"
35 #include "gc/shared/barrierSetNMethod.hpp"
36 #include "gc/shared/collectedHeap.hpp"
37 #include "interpreter/bytecodeTracer.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "interpreter/interpreterRuntime.hpp"
40 #include "interpreter/linkResolver.hpp"
41 #include "interpreter/templateTable.hpp"
42 #include "jvm_io.h"
43 #include "logging/log.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/constantPool.hpp"
48 #include "oops/cpCache.inline.hpp"
49 #include "oops/flatArrayKlass.hpp"
50 #include "oops/flatArrayOop.inline.hpp"
51 #include "oops/inlineKlass.inline.hpp"
52 #include "oops/instanceKlass.inline.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/methodData.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/methodHandles.hpp"
61 #include "prims/nativeLookup.hpp"
62 #include "runtime/atomic.hpp"
63 #include "runtime/continuation.hpp"
64 #include "runtime/deoptimization.hpp"
65 #include "runtime/fieldDescriptor.inline.hpp"
66 #include "runtime/frame.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/icache.hpp"
69 #include "runtime/interfaceSupport.inline.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/jfieldIDWorkaround.hpp"
73 #include "runtime/osThread.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/stackWatermarkSet.hpp"
76 #include "runtime/stubRoutines.hpp"
77 #include "runtime/synchronizer.hpp"
78 #include "runtime/threadCritical.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #ifdef COMPILER2
84 #include "opto/runtime.hpp"
85 #endif
86
87 // Helper class to access current interpreter state
88 class LastFrameAccessor : public StackObj {
89 frame _last_frame;
90 public:
91 LastFrameAccessor(JavaThread* current) {
92 assert(current == Thread::current(), "sanity");
93 _last_frame = current->last_frame();
94 }
95 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
96 Method* method() const { return _last_frame.interpreter_frame_method(); }
97 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
98 int bci() const { return _last_frame.interpreter_frame_bci(); }
99 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
100
101 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
102 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
103
104 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
105 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
106
107 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
108 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
109 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
110 int get_index_u2_cpcache(Bytecodes::Code bc) const
111 { return bytecode().get_index_u2_cpcache(bc); }
112 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
113 int number_of_dimensions() const { return bcp()[3]; }
114 ConstantPoolCacheEntry* cache_entry_at(int i) const
115 { return method()->constants()->cache()->entry_at(i); }
116 ConstantPoolCacheEntry* cache_entry() const { return cache_entry_at(Bytes::get_native_u2(bcp() + 1)); }
117
118 oop callee_receiver(Symbol* signature) {
119 return _last_frame.interpreter_callee_receiver(signature);
120 }
121 BasicObjectLock* monitor_begin() const {
122 return _last_frame.interpreter_frame_monitor_begin();
123 }
124 BasicObjectLock* monitor_end() const {
125 return _last_frame.interpreter_frame_monitor_end();
126 }
127 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
128 return _last_frame.next_monitor_in_interpreter_frame(current);
129 }
130
131 frame& get_frame() { return _last_frame; }
132 };
133
134 //------------------------------------------------------------------------------------------------------------------------
135 // State accessors
136
137 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
138 LastFrameAccessor last_frame(current);
139 last_frame.set_bcp(bcp);
140 if (ProfileInterpreter) {
141 // ProfileTraps uses MDOs independently of ProfileInterpreter.
142 // That is why we must check both ProfileInterpreter and mdo != nullptr.
143 MethodData* mdo = last_frame.method()->method_data();
144 if (mdo != nullptr) {
145 NEEDS_CLEANUP;
146 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
147 }
148 }
149 }
150
151 //------------------------------------------------------------------------------------------------------------------------
152 // Constants
153
154
155 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
156 // access constant pool
157 LastFrameAccessor last_frame(current);
158 ConstantPool* pool = last_frame.method()->constants();
159 int index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
160 constantTag tag = pool->tag_at(index);
161
162 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
163 Klass* klass = pool->klass_at(index, CHECK);
164 oop java_class = tag.is_Qdescriptor_klass()
165 ? InlineKlass::cast(klass)->val_mirror()
166 : klass->java_mirror();
167 current->set_vm_result(java_class);
168 JRT_END
169
170 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
171 assert(bytecode == Bytecodes::_ldc ||
172 bytecode == Bytecodes::_ldc_w ||
173 bytecode == Bytecodes::_ldc2_w ||
174 bytecode == Bytecodes::_fast_aldc ||
175 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
176 ResourceMark rm(current);
177 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
178 bytecode == Bytecodes::_fast_aldc_w);
179 LastFrameAccessor last_frame(current);
180 methodHandle m (current, last_frame.method());
181 Bytecode_loadconstant ldc(m, last_frame.bci());
182
183 // Double-check the size. (Condy can have any type.)
184 BasicType type = ldc.result_type();
185 switch (type2size[type]) {
186 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
187 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
188 default: ShouldNotReachHere();
189 }
190
191 // Resolve the constant. This does not do unboxing.
192 // But it does replace Universe::the_null_sentinel by null.
193 oop result = ldc.resolve_constant(CHECK);
194 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
195
196 #ifdef ASSERT
197 {
198 // The bytecode wrappers aren't GC-safe so construct a new one
199 Bytecode_loadconstant ldc2(m, last_frame.bci());
200 int rindex = ldc2.cache_index();
201 if (rindex < 0)
202 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
203 if (rindex >= 0) {
204 oop coop = m->constants()->resolved_reference_at(rindex);
205 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
206 assert(roop == coop, "expected result for assembly code");
207 }
208 }
209 #endif
210 current->set_vm_result(result);
211 if (!is_fast_aldc) {
212 // Tell the interpreter how to unbox the primitive.
213 guarantee(java_lang_boxing_object::is_instance(result, type), "");
214 int offset = java_lang_boxing_object::value_offset(type);
215 intptr_t flags = ((as_TosState(type) << ConstantPoolCacheEntry::tos_state_shift)
216 | (offset & ConstantPoolCacheEntry::field_index_mask));
217 current->set_vm_result_2((Metadata*)flags);
218 }
219 }
220 JRT_END
221
222
223 //------------------------------------------------------------------------------------------------------------------------
224 // Allocation
225
226 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
227 Klass* k = pool->klass_at(index, CHECK);
228 InstanceKlass* klass = InstanceKlass::cast(k);
229
230 if (klass->is_inline_klass()) {
231 THROW(vmSymbols::java_lang_InstantiationError());
232 }
233
234 // Make sure we are not instantiating an abstract klass
235 klass->check_valid_for_instantiation(true, CHECK);
236
237 // Make sure klass is initialized
238 klass->initialize(CHECK);
239
240 // At this point the class may not be fully initialized
241 // because of recursive initialization. If it is fully
242 // initialized & has_finalized is not set, we rewrite
243 // it into its fast version (Note: no locking is needed
244 // here since this is an atomic byte write and can be
245 // done more than once).
246 //
247 // Note: In case of classes with has_finalized we don't
248 // rewrite since that saves us an extra check in
249 // the fast version which then would call the
250 // slow version anyway (and do a call back into
251 // Java).
252 // If we have a breakpoint, then we don't rewrite
253 // because the _breakpoint bytecode would be lost.
254 oop obj = klass->allocate_instance(CHECK);
255 current->set_vm_result(obj);
256 JRT_END
257
258 JRT_ENTRY(void, InterpreterRuntime::aconst_init(JavaThread* current, ConstantPool* pool, int index))
259 // Getting the InlineKlass
260 Klass* k = pool->klass_at(index, CHECK);
261 if (!k->is_inline_klass()) {
262 // inconsistency with 'new' which throws an InstantiationError
263 // in the future, aconst_init will just return null instead of throwing an exception
264 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
265 }
266 assert(k->is_inline_klass(), "aconst_init argument must be the inline type class");
267 InlineKlass* vklass = InlineKlass::cast(k);
268
269 vklass->initialize(CHECK);
270 oop res = vklass->default_value();
271 current->set_vm_result(res);
272 JRT_END
273
274 JRT_ENTRY(int, InterpreterRuntime::withfield(JavaThread* current, ConstantPoolCacheEntry* cpe, uintptr_t ptr))
275 oop obj = nullptr;
276 int recv_offset = type2size[as_BasicType(cpe->flag_state())];
277 assert(frame::interpreter_frame_expression_stack_direction() == -1, "currently is -1 on all platforms");
278 int ret_adj = (recv_offset + type2size[T_OBJECT] )* AbstractInterpreter::stackElementSize;
279 int offset = cpe->f2_as_offset();
280 obj = (oopDesc*)(((uintptr_t*)ptr)[recv_offset * Interpreter::stackElementWords]);
281 if (obj == nullptr) {
282 THROW_(vmSymbols::java_lang_NullPointerException(), ret_adj);
283 }
284 assert(oopDesc::is_oop(obj), "Verifying receiver");
285 assert(obj->klass()->is_inline_klass(), "Must have been checked during resolution");
286 instanceHandle old_value_h(THREAD, (instanceOop)obj);
287 oop ref = nullptr;
288 if (cpe->flag_state() == atos) {
289 ref = *(oopDesc**)ptr;
290 }
291 Handle ref_h(THREAD, ref);
292 InlineKlass* ik = InlineKlass::cast(old_value_h()->klass());
293 // Ensure that the class is initialized or being initialized
294 // If the class is in error state, the creation of a new value should not be allowed
295 ik->initialize(CHECK_(ret_adj));
296
297 bool can_skip = false;
298 switch(cpe->flag_state()) {
299 case ztos:
300 if (old_value_h()->bool_field(offset) == (jboolean)(*(jint*)ptr)) can_skip = true;
301 break;
302 case btos:
303 if (old_value_h()->byte_field(offset) == (jbyte)(*(jint*)ptr)) can_skip = true;
304 break;
305 case ctos:
306 if (old_value_h()->char_field(offset) == (jchar)(*(jint*)ptr)) can_skip = true;
307 break;
308 case stos:
309 if (old_value_h()->short_field(offset) == (jshort)(*(jint*)ptr)) can_skip = true;
310 break;
311 case itos:
312 if (old_value_h()->int_field(offset) == *(jint*)ptr) can_skip = true;
313 break;
314 case ltos:
315 if (old_value_h()->long_field(offset) == *(jlong*)ptr) can_skip = true;
316 break;
317 case ftos:
318 if (memcmp(old_value_h()->field_addr<jfloat>(offset), (jfloat*)ptr, sizeof(jfloat)) == 0) can_skip = true;
319 break;
320 case dtos:
321 if (memcmp(old_value_h()->field_addr<jdouble>(offset), (jdouble*)ptr, sizeof(jdouble)) == 0) can_skip = true;
322 break;
323 case atos:
324 if (!cpe->is_inlined() && old_value_h()->obj_field(offset) == ref_h()) can_skip = true;
325 break;
326 default:
327 break;
328 }
329 if (can_skip) {
330 current->set_vm_result(old_value_h());
331 return ret_adj;
332 }
333
334 instanceOop new_value = ik->allocate_instance_buffer(CHECK_(ret_adj));
335 Handle new_value_h = Handle(THREAD, new_value);
336 ik->inline_copy_oop_to_new_oop(old_value_h(), new_value_h());
337 switch(cpe->flag_state()) {
338 case ztos:
339 new_value_h()->bool_field_put(offset, (jboolean)(*(jint*)ptr));
340 break;
341 case btos:
342 new_value_h()->byte_field_put(offset, (jbyte)(*(jint*)ptr));
343 break;
344 case ctos:
345 new_value_h()->char_field_put(offset, (jchar)(*(jint*)ptr));
346 break;
347 case stos:
348 new_value_h()->short_field_put(offset, (jshort)(*(jint*)ptr));
349 break;
350 case itos:
351 new_value_h()->int_field_put(offset, (*(jint*)ptr));
352 break;
353 case ltos:
354 new_value_h()->long_field_put(offset, *(jlong*)ptr);
355 break;
356 case ftos:
357 new_value_h()->float_field_put(offset, *(jfloat*)ptr);
358 break;
359 case dtos:
360 new_value_h()->double_field_put(offset, *(jdouble*)ptr);
361 break;
362 case atos:
363 {
364 if (cpe->is_null_free_inline_type()) {
365 if (!cpe->is_inlined()) {
366 if (ref_h() == nullptr) {
367 THROW_(vmSymbols::java_lang_NullPointerException(), ret_adj);
368 }
369 new_value_h()->obj_field_put(offset, ref_h());
370 } else {
371 int field_index = cpe->field_index();
372 InlineKlass* field_ik = InlineKlass::cast(ik->get_inline_type_field_klass(field_index));
373 field_ik->write_inlined_field(new_value_h(), offset, ref_h(), CHECK_(ret_adj));
374 }
375 } else {
376 new_value_h()->obj_field_put(offset, ref_h());
377 }
378 }
379 break;
380 default:
381 ShouldNotReachHere();
382 }
383 current->set_vm_result(new_value_h());
384 return ret_adj;
385 JRT_END
386
387 JRT_ENTRY(void, InterpreterRuntime::uninitialized_static_inline_type_field(JavaThread* current, oopDesc* mirror, int index))
388 // The interpreter tries to access an inline static field that has not been initialized.
389 // This situation can happen in different scenarios:
390 // 1 - if the load or initialization of the field failed during step 8 of
391 // the initialization of the holder of the field, in this case the access to the field
392 // must fail
393 // 2 - it can also happen when the initialization of the holder class triggered the initialization of
394 // another class which accesses this field in its static initializer, in this case the
395 // access must succeed to allow circularity
396 // The code below tries to load and initialize the field's class again before returning the default value.
397 // If the field was not initialized because of an error, an exception should be thrown.
398 // If the class is being initialized, the default value is returned.
399 instanceHandle mirror_h(THREAD, (instanceOop)mirror);
400 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
401 assert(klass->field_signature(index)->is_Q_signature(), "Sanity check");
402 if (klass->is_being_initialized() && klass->is_init_thread(THREAD)) {
403 int offset = klass->field_offset(index);
404 Klass* field_k = klass->get_inline_type_field_klass_or_null(index);
405 if (field_k == nullptr) {
406 field_k = SystemDictionary::resolve_or_fail(klass->field_signature(index)->fundamental_name(THREAD),
407 Handle(THREAD, klass->class_loader()),
408 Handle(THREAD, klass->protection_domain()),
409 true, CHECK);
410 assert(field_k != nullptr, "Should have been loaded or an exception thrown above");
411 klass->set_inline_type_field_klass(index, field_k);
412 }
413 field_k->initialize(CHECK);
414 oop defaultvalue = InlineKlass::cast(field_k)->default_value();
415 // It is safe to initialize the static field because 1) the current thread is the initializing thread
416 // and is the only one that can access it, and 2) the field is actually not initialized (i.e. null)
417 // otherwise the JVM should not be executing this code.
418 mirror_h()->obj_field_put(offset, defaultvalue);
419 current->set_vm_result(defaultvalue);
420 } else {
421 assert(klass->is_in_error_state(), "If not initializing, initialization must have failed to get there");
422 ResourceMark rm(THREAD);
423 const char* desc = "Could not initialize class ";
424 const char* className = klass->external_name();
425 size_t msglen = strlen(desc) + strlen(className) + 1;
426 char* message = NEW_RESOURCE_ARRAY(char, msglen);
427 if (nullptr == message) {
428 // Out of memory: can't create detailed error message
429 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
430 } else {
431 jio_snprintf(message, msglen, "%s%s", desc, className);
432 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
433 }
434 }
435 JRT_END
436
437 JRT_ENTRY(void, InterpreterRuntime::read_inlined_field(JavaThread* current, oopDesc* obj, int index, Klass* field_holder))
438 Handle obj_h(THREAD, obj);
439
440 assert(oopDesc::is_oop(obj), "Sanity check");
441
442 assert(field_holder->is_instance_klass(), "Sanity check");
443 InstanceKlass* klass = InstanceKlass::cast(field_holder);
444
445 assert(klass->field_is_inlined(index), "Sanity check");
446
447 InlineKlass* field_vklass = InlineKlass::cast(klass->get_inline_type_field_klass(index));
448
449 oop res = field_vklass->read_inlined_field(obj_h(), klass->field_offset(index), CHECK);
450 current->set_vm_result(res);
451 JRT_END
452
453 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
454 oop obj = oopFactory::new_typeArray(type, size, CHECK);
455 current->set_vm_result(obj);
456 JRT_END
457
458
459 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
460 Klass* klass = pool->klass_at(index, CHECK);
461 bool is_qtype_desc = pool->tag_at(index).is_Qdescriptor_klass();
462 arrayOop obj;
463 if ((!klass->is_array_klass()) && is_qtype_desc) { // Logically creates elements, ensure klass init
464 klass->initialize(CHECK);
465 obj = oopFactory::new_valueArray(klass, size, CHECK);
466 } else {
467 obj = oopFactory::new_objArray(klass, size, CHECK);
468 }
469 current->set_vm_result(obj);
470 JRT_END
471
472 JRT_ENTRY(void, InterpreterRuntime::value_array_load(JavaThread* current, arrayOopDesc* array, int index))
473 flatArrayHandle vah(current, (flatArrayOop)array);
474 oop value_holder = flatArrayOopDesc::value_alloc_copy_from_index(vah, index, CHECK);
475 current->set_vm_result(value_holder);
476 JRT_END
477
478 JRT_ENTRY(void, InterpreterRuntime::value_array_store(JavaThread* current, void* val, arrayOopDesc* array, int index))
479 assert(val != nullptr, "can't store null into flat array");
480 ((flatArrayOop)array)->value_copy_to_index(cast_to_oop(val), index);
481 JRT_END
482
483 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
484 // We may want to pass in more arguments - could make this slightly faster
485 LastFrameAccessor last_frame(current);
486 ConstantPool* constants = last_frame.method()->constants();
487 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
488 Klass* klass = constants->klass_at(i, CHECK);
489 bool is_qtype = klass->name()->is_Q_array_signature();
490 int nof_dims = last_frame.number_of_dimensions();
491 assert(klass->is_klass(), "not a class");
492 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
493
494 if (is_qtype) { // Logically creates elements, ensure klass init
495 klass->initialize(CHECK);
496 }
497
498 // We must create an array of jints to pass to multi_allocate.
499 ResourceMark rm(current);
500 const int small_dims = 10;
501 jint dim_array[small_dims];
502 jint *dims = &dim_array[0];
503 if (nof_dims > small_dims) {
504 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
505 }
506 for (int index = 0; index < nof_dims; index++) {
507 // offset from first_size_address is addressed as local[index]
508 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
509 dims[index] = first_size_address[n];
510 }
511 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
512 current->set_vm_result(obj);
513 JRT_END
514
515
516 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
517 assert(oopDesc::is_oop(obj), "must be a valid oop");
518 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
519 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
520 JRT_END
521
522 JRT_ENTRY(jboolean, InterpreterRuntime::is_substitutable(JavaThread* current, oopDesc* aobj, oopDesc* bobj))
523 assert(oopDesc::is_oop(aobj) && oopDesc::is_oop(bobj), "must be valid oops");
524
525 Handle ha(THREAD, aobj);
526 Handle hb(THREAD, bobj);
527 JavaValue result(T_BOOLEAN);
528 JavaCallArguments args;
529 args.push_oop(ha);
530 args.push_oop(hb);
531 methodHandle method(current, Universe::is_substitutable_method());
532 JavaCalls::call(&result, method, &args, THREAD);
533 if (HAS_PENDING_EXCEPTION) {
534 // Something really bad happened because isSubstitutable() should not throw exceptions
535 // If it is an error, just let it propagate
536 // If it is an exception, wrap it into an InternalError
537 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
538 Handle e(THREAD, PENDING_EXCEPTION);
539 CLEAR_PENDING_EXCEPTION;
540 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in substitutability test", e, false);
541 }
542 }
543 return result.get_jboolean();
544 JRT_END
545
546 // Quicken instance-of and check-cast bytecodes
547 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
548 // Force resolving; quicken the bytecode
549 LastFrameAccessor last_frame(current);
550 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
551 ConstantPool* cpool = last_frame.method()->constants();
552 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
553 // program we might have seen an unquick'd bytecode in the interpreter but have another
554 // thread quicken the bytecode before we get here.
555 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
556 Klass* klass = cpool->klass_at(which, CHECK);
557 current->set_vm_result_2(klass);
558 JRT_END
559
560
561 //------------------------------------------------------------------------------------------------------------------------
562 // Exceptions
563
564 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
565 const methodHandle& trap_method, int trap_bci) {
566 if (trap_method.not_null()) {
567 MethodData* trap_mdo = trap_method->method_data();
568 if (trap_mdo == nullptr) {
569 ExceptionMark em(current);
570 JavaThread* THREAD = current; // For exception macros.
571 Method::build_profiling_method_data(trap_method, THREAD);
572 if (HAS_PENDING_EXCEPTION) {
573 // Only metaspace OOM is expected. No Java code executed.
574 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
575 "we expect only an OOM error here");
576 CLEAR_PENDING_EXCEPTION;
577 }
578 trap_mdo = trap_method->method_data();
579 // and fall through...
580 }
581 if (trap_mdo != nullptr) {
582 // Update per-method count of trap events. The interpreter
583 // is updating the MDO to simulate the effect of compiler traps.
584 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
585 }
586 }
587 }
588
589 // Assume the compiler is (or will be) interested in this event.
590 // If necessary, create an MDO to hold the information, and record it.
591 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
592 assert(ProfileTraps, "call me only if profiling");
593 LastFrameAccessor last_frame(current);
594 methodHandle trap_method(current, last_frame.method());
595 int trap_bci = trap_method->bci_from(last_frame.bcp());
596 note_trap_inner(current, reason, trap_method, trap_bci);
597 }
598
599 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
600 // get klass
601 InstanceKlass* klass = InstanceKlass::cast(k);
602 assert(klass->is_initialized(),
603 "this klass should have been initialized during VM initialization");
604 // create instance - do not call constructor since we may have no
605 // (java) stack space left (should assert constructor is empty)
606 Handle exception;
607 oop exception_oop = klass->allocate_instance(CHECK_(exception));
608 exception = Handle(THREAD, exception_oop);
609 if (StackTraceInThrowable) {
610 java_lang_Throwable::fill_in_stack_trace(exception);
611 }
612 return exception;
613 }
614
615 // Special handling for stack overflow: since we don't have any (java) stack
616 // space left we use the pre-allocated & pre-initialized StackOverflowError
617 // klass to create an stack overflow error instance. We do not call its
618 // constructor for the same reason (it is empty, anyway).
619 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
620 Handle exception = get_preinitialized_exception(
621 vmClasses::StackOverflowError_klass(),
622 CHECK);
623 // Increment counter for hs_err file reporting
624 Atomic::inc(&Exceptions::_stack_overflow_errors);
625 // Remove the ScopedValue bindings in case we got a StackOverflowError
626 // while we were trying to manipulate ScopedValue bindings.
627 current->clear_scopedValueBindings();
628 THROW_HANDLE(exception);
629 JRT_END
630
631 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
632 Handle exception = get_preinitialized_exception(
633 vmClasses::StackOverflowError_klass(),
634 CHECK);
635 java_lang_Throwable::set_message(exception(),
636 Universe::delayed_stack_overflow_error_message());
637 // Increment counter for hs_err file reporting
638 Atomic::inc(&Exceptions::_stack_overflow_errors);
639 // Remove the ScopedValue bindings in case we got a StackOverflowError
640 // while we were trying to manipulate ScopedValue bindings.
641 current->clear_scopedValueBindings();
642 THROW_HANDLE(exception);
643 JRT_END
644
645 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
646 // lookup exception klass
647 TempNewSymbol s = SymbolTable::new_symbol(name);
648 if (ProfileTraps) {
649 if (s == vmSymbols::java_lang_ArithmeticException()) {
650 note_trap(current, Deoptimization::Reason_div0_check);
651 } else if (s == vmSymbols::java_lang_NullPointerException()) {
652 note_trap(current, Deoptimization::Reason_null_check);
653 }
654 }
655 // create exception
656 Handle exception = Exceptions::new_exception(current, s, message);
657 current->set_vm_result(exception());
658 JRT_END
659
660
661 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
662 // Produce the error message first because note_trap can safepoint
663 ResourceMark rm(current);
664 const char* klass_name = obj->klass()->external_name();
665 // lookup exception klass
666 TempNewSymbol s = SymbolTable::new_symbol(name);
667 if (ProfileTraps) {
668 if (s == vmSymbols::java_lang_ArrayStoreException()) {
669 note_trap(current, Deoptimization::Reason_array_check);
670 } else {
671 note_trap(current, Deoptimization::Reason_class_check);
672 }
673 }
674 // create exception, with klass name as detail message
675 Handle exception = Exceptions::new_exception(current, s, klass_name);
676 current->set_vm_result(exception());
677 JRT_END
678
679 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
680 // Produce the error message first because note_trap can safepoint
681 ResourceMark rm(current);
682 stringStream ss;
683 ss.print("Index %d out of bounds for length %d", index, a->length());
684
685 if (ProfileTraps) {
686 note_trap(current, Deoptimization::Reason_range_check);
687 }
688
689 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
690 JRT_END
691
692 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
693 JavaThread* current, oopDesc* obj))
694
695 // Produce the error message first because note_trap can safepoint
696 ResourceMark rm(current);
697 char* message = SharedRuntime::generate_class_cast_message(
698 current, obj->klass());
699
700 if (ProfileTraps) {
701 note_trap(current, Deoptimization::Reason_class_check);
702 }
703
704 // create exception
705 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
706 JRT_END
707
708 // exception_handler_for_exception(...) returns the continuation address,
709 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
710 // The exception oop is returned to make sure it is preserved over GC (it
711 // is only on the stack if the exception was thrown explicitly via athrow).
712 // During this operation, the expression stack contains the values for the
713 // bci where the exception happened. If the exception was propagated back
714 // from a call, the expression stack contains the values for the bci at the
715 // invoke w/o arguments (i.e., as if one were inside the call).
716 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
717 // We get here after we have unwound from a callee throwing an exception
718 // into the interpreter. Any deferred stack processing is notified of
719 // the event via the StackWatermarkSet.
720 StackWatermarkSet::after_unwind(current);
721
722 LastFrameAccessor last_frame(current);
723 Handle h_exception(current, exception);
724 methodHandle h_method (current, last_frame.method());
725 constantPoolHandle h_constants(current, h_method->constants());
726 bool should_repeat;
727 int handler_bci;
728 int current_bci = last_frame.bci();
729
730 if (current->frames_to_pop_failed_realloc() > 0) {
731 // Allocation of scalar replaced object used in this frame
732 // failed. Unconditionally pop the frame.
733 current->dec_frames_to_pop_failed_realloc();
734 current->set_vm_result(h_exception());
735 // If the method is synchronized we already unlocked the monitor
736 // during deoptimization so the interpreter needs to skip it when
737 // the frame is popped.
738 current->set_do_not_unlock_if_synchronized(true);
739 return Interpreter::remove_activation_entry();
740 }
741
742 // Need to do this check first since when _do_not_unlock_if_synchronized
743 // is set, we don't want to trigger any classloading which may make calls
744 // into java, or surprisingly find a matching exception handler for bci 0
745 // since at this moment the method hasn't been "officially" entered yet.
746 if (current->do_not_unlock_if_synchronized()) {
747 ResourceMark rm;
748 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
749 current->set_vm_result(exception);
750 return Interpreter::remove_activation_entry();
751 }
752
753 do {
754 should_repeat = false;
755
756 // assertions
757 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
758 // Check that exception is a subclass of Throwable.
759 assert(h_exception->is_a(vmClasses::Throwable_klass()),
760 "Exception not subclass of Throwable");
761
762 // tracing
763 if (log_is_enabled(Info, exceptions)) {
764 ResourceMark rm(current);
765 stringStream tempst;
766 tempst.print("interpreter method <%s>\n"
767 " at bci %d for thread " INTPTR_FORMAT " (%s)",
768 h_method->print_value_string(), current_bci, p2i(current), current->name());
769 Exceptions::log_exception(h_exception, tempst.as_string());
770 }
771 // Don't go paging in something which won't be used.
772 // else if (extable->length() == 0) {
773 // // disabled for now - interpreter is not using shortcut yet
774 // // (shortcut is not to call runtime if we have no exception handlers)
775 // // warning("performance bug: should not call runtime if method has no exception handlers");
776 // }
777 // for AbortVMOnException flag
778 Exceptions::debug_check_abort(h_exception);
779
780 // exception handler lookup
781 Klass* klass = h_exception->klass();
782 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
783 if (HAS_PENDING_EXCEPTION) {
784 // We threw an exception while trying to find the exception handler.
785 // Transfer the new exception to the exception handle which will
786 // be set into thread local storage, and do another lookup for an
787 // exception handler for this exception, this time starting at the
788 // BCI of the exception handler which caused the exception to be
789 // thrown (bug 4307310).
790 h_exception = Handle(THREAD, PENDING_EXCEPTION);
791 CLEAR_PENDING_EXCEPTION;
792 if (handler_bci >= 0) {
793 current_bci = handler_bci;
794 should_repeat = true;
795 }
796 }
797 } while (should_repeat == true);
798
799 #if INCLUDE_JVMCI
800 if (EnableJVMCI && h_method->method_data() != nullptr) {
801 ResourceMark rm(current);
802 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, nullptr);
803 if (pdata != nullptr && pdata->is_BitData()) {
804 BitData* bit_data = (BitData*) pdata;
805 bit_data->set_exception_seen();
806 }
807 }
808 #endif
809
810 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
811 // time throw or a stack unwinding throw and accordingly notify the debugger
812 if (JvmtiExport::can_post_on_exceptions()) {
813 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
814 }
815
816 address continuation = nullptr;
817 address handler_pc = nullptr;
818 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
819 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
820 // handler in this method, or (b) after a stack overflow there is not yet
821 // enough stack space available to reprotect the stack.
822 continuation = Interpreter::remove_activation_entry();
823 #if COMPILER2_OR_JVMCI
824 // Count this for compilation purposes
825 h_method->interpreter_throwout_increment(THREAD);
826 #endif
827 } else {
828 // handler in this method => change bci/bcp to handler bci/bcp and continue there
829 handler_pc = h_method->code_base() + handler_bci;
830 #ifndef ZERO
831 set_bcp_and_mdp(handler_pc, current);
832 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
833 #else
834 continuation = (address)(intptr_t) handler_bci;
835 #endif
836 }
837
838 // notify debugger of an exception catch
839 // (this is good for exceptions caught in native methods as well)
840 if (JvmtiExport::can_post_on_exceptions()) {
841 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
842 }
843
844 current->set_vm_result(h_exception());
845 return continuation;
846 JRT_END
847
848
849 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
850 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
851 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
852 JRT_END
853
854
855 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
856 THROW(vmSymbols::java_lang_AbstractMethodError());
857 JRT_END
858
859 // This method is called from the "abstract_entry" of the interpreter.
860 // At that point, the arguments have already been removed from the stack
861 // and therefore we don't have the receiver object at our fingertips. (Though,
862 // on some platforms the receiver still resides in a register...). Thus,
863 // we have no choice but print an error message not containing the receiver
864 // type.
865 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
866 Method* missingMethod))
867 ResourceMark rm(current);
868 assert(missingMethod != nullptr, "sanity");
869 methodHandle m(current, missingMethod);
870 LinkResolver::throw_abstract_method_error(m, THREAD);
871 JRT_END
872
873 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
874 Klass* recvKlass,
875 Method* missingMethod))
876 ResourceMark rm(current);
877 methodHandle mh = methodHandle(current, missingMethod);
878 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
879 JRT_END
880
881 JRT_ENTRY(void, InterpreterRuntime::throw_InstantiationError(JavaThread* current))
882 THROW(vmSymbols::java_lang_InstantiationError());
883 JRT_END
884
885
886 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
887 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
888 JRT_END
889
890 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
891 Klass* recvKlass,
892 Klass* interfaceKlass))
893 ResourceMark rm(current);
894 char buf[1000];
895 buf[0] = '\0';
896 jio_snprintf(buf, sizeof(buf),
897 "Class %s does not implement the requested interface %s",
898 recvKlass ? recvKlass->external_name() : "nullptr",
899 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
900 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
901 JRT_END
902
903 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
904 THROW(vmSymbols::java_lang_NullPointerException());
905 JRT_END
906
907 //------------------------------------------------------------------------------------------------------------------------
908 // Fields
909 //
910
911 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
912 // resolve field
913 fieldDescriptor info;
914 LastFrameAccessor last_frame(current);
915 constantPoolHandle pool(current, last_frame.method()->constants());
916 methodHandle m(current, last_frame.method());
917 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
918 bytecode == Bytecodes::_putstatic || bytecode == Bytecodes::_withfield);
919 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
920 bool is_inline_type = bytecode == Bytecodes::_withfield;
921
922 {
923 JvmtiHideSingleStepping jhss(current);
924 JavaThread* THREAD = current; // For exception macros.
925 LinkResolver::resolve_field_access(info, pool, last_frame.get_index_u2_cpcache(bytecode),
926 m, bytecode, CHECK);
927 } // end JvmtiHideSingleStepping
928
929 // check if link resolution caused cpCache to be updated
930 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
931 if (cp_cache_entry->is_resolved(bytecode)) return;
932
933 // compute auxiliary field attributes
934 TosState state = as_TosState(info.field_type());
935
936 // Resolution of put instructions on final fields is delayed. That is required so that
937 // exceptions are thrown at the correct place (when the instruction is actually invoked).
938 // If we do not resolve an instruction in the current pass, leaving the put_code
939 // set to zero will cause the next put instruction to the same field to reresolve.
940
941 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
942 // to final instance fields with updates originating from a method different than <init>)
943 // is inhibited. A putfield instruction targeting an instance final field must throw
944 // an IllegalAccessError if the instruction is not in an instance
945 // initializer method <init>. If resolution were not inhibited, a putfield
946 // in an initializer method could be resolved in the initializer. Subsequent
947 // putfield instructions to the same field would then use cached information.
948 // As a result, those instructions would not pass through the VM. That is,
949 // checks in resolve_field_access() would not be executed for those instructions
950 // and the required IllegalAccessError would not be thrown.
951 //
952 // Also, we need to delay resolving getstatic and putstatic instructions until the
953 // class is initialized. This is required so that access to the static
954 // field will call the initialization function every time until the class
955 // is completely initialized ala. in 2.17.5 in JVM Specification.
956 InstanceKlass* klass = info.field_holder();
957 bool uninitialized_static = is_static && !klass->is_initialized();
958 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
959 info.has_initialized_final_update();
960 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
961
962 Bytecodes::Code get_code = (Bytecodes::Code)0;
963 Bytecodes::Code put_code = (Bytecodes::Code)0;
964 if (!uninitialized_static) {
965 if (is_static) {
966 get_code = Bytecodes::_getstatic;
967 } else {
968 get_code = Bytecodes::_getfield;
969 }
970 if (is_put && is_inline_type) {
971 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_withfield);
972 } else if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
973 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
974 }
975 }
976
977 cp_cache_entry->set_field(
978 get_code,
979 put_code,
980 info.field_holder(),
981 info.index(),
982 info.offset(),
983 state,
984 info.access_flags().is_final(),
985 info.access_flags().is_volatile(),
986 info.is_inlined(),
987 info.signature()->is_Q_signature() && info.is_inline_type()
988 );
989 }
990
991
992 //------------------------------------------------------------------------------------------------------------------------
993 // Synchronization
994 //
995 // The interpreter's synchronization code is factored out so that it can
996 // be shared by method invocation and synchronized blocks.
997 //%note synchronization_3
998
999 //%note monitor_1
1000 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
1001 #ifdef ASSERT
1002 current->last_frame().interpreter_frame_verify_monitor(elem);
1003 #endif
1004 Handle h_obj(current, elem->obj());
1005 assert(Universe::heap()->is_in_or_null(h_obj()),
1006 "must be null or an object");
1007 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
1008 assert(Universe::heap()->is_in_or_null(elem->obj()),
1009 "must be null or an object");
1010 #ifdef ASSERT
1011 current->last_frame().interpreter_frame_verify_monitor(elem);
1012 #endif
1013 JRT_END
1014
1015
1016 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
1017 oop obj = elem->obj();
1018 assert(Universe::heap()->is_in(obj), "must be an object");
1019 // The object could become unlocked through a JNI call, which we have no other checks for.
1020 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
1021 if (obj->is_unlocked()) {
1022 if (CheckJNICalls) {
1023 fatal("Object has been unlocked by JNI");
1024 }
1025 return;
1026 }
1027 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
1028 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
1029 // again at method exit or in the case of an exception.
1030 elem->set_obj(nullptr);
1031 JRT_END
1032
1033
1034 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
1035 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
1036 JRT_END
1037
1038
1039 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
1040 // Returns an illegal exception to install into the current thread. The
1041 // pending_exception flag is cleared so normal exception handling does not
1042 // trigger. Any current installed exception will be overwritten. This
1043 // method will be called during an exception unwind.
1044
1045 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
1046 Handle exception(current, current->vm_result());
1047 assert(exception() != nullptr, "vm result should be set");
1048 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
1049 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
1050 current->set_vm_result(exception());
1051 JRT_END
1052
1053
1054 //------------------------------------------------------------------------------------------------------------------------
1055 // Invokes
1056
1057 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
1058 return method->orig_bytecode_at(method->bci_from(bcp));
1059 JRT_END
1060
1061 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
1062 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
1063 JRT_END
1064
1065 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
1066 JvmtiExport::post_raw_breakpoint(current, method, bcp);
1067 JRT_END
1068
1069 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
1070 LastFrameAccessor last_frame(current);
1071 // extract receiver from the outgoing argument list if necessary
1072 Handle receiver(current, nullptr);
1073 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
1074 bytecode == Bytecodes::_invokespecial) {
1075 ResourceMark rm(current);
1076 methodHandle m (current, last_frame.method());
1077 Bytecode_invoke call(m, last_frame.bci());
1078 Symbol* signature = call.signature();
1079 receiver = Handle(current, last_frame.callee_receiver(signature));
1080
1081 assert(Universe::heap()->is_in_or_null(receiver()),
1082 "sanity check");
1083 assert(receiver.is_null() ||
1084 !Universe::heap()->is_in(receiver->klass()),
1085 "sanity check");
1086 }
1087
1088 // resolve method
1089 CallInfo info;
1090 constantPoolHandle pool(current, last_frame.method()->constants());
1091
1092 methodHandle resolved_method;
1093
1094 {
1095 JvmtiHideSingleStepping jhss(current);
1096 JavaThread* THREAD = current; // For exception macros.
1097 LinkResolver::resolve_invoke(info, receiver, pool,
1098 last_frame.get_index_u2_cpcache(bytecode), bytecode,
1099 THREAD);
1100
1101 if (HAS_PENDING_EXCEPTION) {
1102 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
1103 // Preserve the original exception across the call to note_trap()
1104 PreserveExceptionMark pm(current);
1105 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
1106 note_trap(current, Deoptimization::Reason_null_check);
1107 }
1108 return;
1109 }
1110
1111 if (JvmtiExport::can_hotswap_or_post_breakpoint() && info.resolved_method()->is_old()) {
1112 resolved_method = methodHandle(current, info.resolved_method()->get_new_method());
1113 } else {
1114 resolved_method = methodHandle(current, info.resolved_method());
1115 }
1116 } // end JvmtiHideSingleStepping
1117
1118 // check if link resolution caused cpCache to be updated
1119 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
1120 if (cp_cache_entry->is_resolved(bytecode)) return;
1121
1122 #ifdef ASSERT
1123 if (bytecode == Bytecodes::_invokeinterface) {
1124 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
1125 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
1126 // (see also CallInfo::set_interface for details)
1127 assert(info.call_kind() == CallInfo::vtable_call ||
1128 info.call_kind() == CallInfo::direct_call, "");
1129 assert(resolved_method->is_final() || info.has_vtable_index(),
1130 "should have been set already");
1131 } else if (!resolved_method->has_itable_index()) {
1132 // Resolved something like CharSequence.toString. Use vtable not itable.
1133 assert(info.call_kind() != CallInfo::itable_call, "");
1134 } else {
1135 // Setup itable entry
1136 assert(info.call_kind() == CallInfo::itable_call, "");
1137 int index = resolved_method->itable_index();
1138 assert(info.itable_index() == index, "");
1139 }
1140 } else if (bytecode == Bytecodes::_invokespecial) {
1141 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
1142 } else {
1143 assert(info.call_kind() == CallInfo::direct_call ||
1144 info.call_kind() == CallInfo::vtable_call, "");
1145 }
1146 #endif
1147 // Get sender and only set cpCache entry to resolved if it is not an
1148 // interface. The receiver for invokespecial calls within interface
1149 // methods must be checked for every call.
1150 InstanceKlass* sender = pool->pool_holder();
1151
1152 switch (info.call_kind()) {
1153 case CallInfo::direct_call:
1154 cp_cache_entry->set_direct_call(
1155 bytecode,
1156 resolved_method,
1157 sender->is_interface());
1158 break;
1159 case CallInfo::vtable_call:
1160 cp_cache_entry->set_vtable_call(
1161 bytecode,
1162 resolved_method,
1163 info.vtable_index());
1164 break;
1165 case CallInfo::itable_call:
1166 cp_cache_entry->set_itable_call(
1167 bytecode,
1168 info.resolved_klass(),
1169 resolved_method,
1170 info.itable_index());
1171 break;
1172 default: ShouldNotReachHere();
1173 }
1174 }
1175
1176
1177 // First time execution: Resolve symbols, create a permanent MethodType object.
1178 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
1179 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
1180 LastFrameAccessor last_frame(current);
1181
1182 // resolve method
1183 CallInfo info;
1184 constantPoolHandle pool(current, last_frame.method()->constants());
1185 {
1186 JvmtiHideSingleStepping jhss(current);
1187 JavaThread* THREAD = current; // For exception macros.
1188 LinkResolver::resolve_invoke(info, Handle(), pool,
1189 last_frame.get_index_u2_cpcache(bytecode), bytecode,
1190 CHECK);
1191 } // end JvmtiHideSingleStepping
1192
1193 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
1194 cp_cache_entry->set_method_handle(pool, info);
1195 }
1196
1197 // First time execution: Resolve symbols, create a permanent CallSite object.
1198 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
1199 LastFrameAccessor last_frame(current);
1200 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
1201
1202 // resolve method
1203 CallInfo info;
1204 constantPoolHandle pool(current, last_frame.method()->constants());
1205 int index = last_frame.get_index_u4(bytecode);
1206 {
1207 JvmtiHideSingleStepping jhss(current);
1208 JavaThread* THREAD = current; // For exception macros.
1209 LinkResolver::resolve_invoke(info, Handle(), pool,
1210 index, bytecode, CHECK);
1211 } // end JvmtiHideSingleStepping
1212
1213 pool->cache()->set_dynamic_call(info, pool->decode_invokedynamic_index(index));
1214 }
1215
1216 // This function is the interface to the assembly code. It returns the resolved
1217 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
1218 // This function will check for redefinition!
1219 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
1220 switch (bytecode) {
1221 case Bytecodes::_getstatic:
1222 case Bytecodes::_putstatic:
1223 case Bytecodes::_getfield:
1224 case Bytecodes::_putfield:
1225 case Bytecodes::_withfield:
1226 resolve_get_put(current, bytecode);
1227 break;
1228 case Bytecodes::_invokevirtual:
1229 case Bytecodes::_invokespecial:
1230 case Bytecodes::_invokestatic:
1231 case Bytecodes::_invokeinterface:
1232 resolve_invoke(current, bytecode);
1233 break;
1234 case Bytecodes::_invokehandle:
1235 resolve_invokehandle(current);
1236 break;
1237 case Bytecodes::_invokedynamic:
1238 resolve_invokedynamic(current);
1239 break;
1240 default:
1241 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1242 break;
1243 }
1244 }
1245 JRT_END
1246
1247 //------------------------------------------------------------------------------------------------------------------------
1248 // Miscellaneous
1249
1250
1251 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1252 // Enable WXWrite: the function is called directly by interpreter.
1253 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1254
1255 // frequency_counter_overflow_inner can throw async exception.
1256 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1257 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1258 if (branch_bcp != nullptr && nm != nullptr) {
1259 // This was a successful request for an OSR nmethod. Because
1260 // frequency_counter_overflow_inner ends with a safepoint check,
1261 // nm could have been unloaded so look it up again. It's unsafe
1262 // to examine nm directly since it might have been freed and used
1263 // for something else.
1264 LastFrameAccessor last_frame(current);
1265 Method* method = last_frame.method();
1266 int bci = method->bci_from(last_frame.bcp());
1267 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1268 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1269 if (nm != nullptr && bs_nm != nullptr) {
1270 // in case the transition passed a safepoint we need to barrier this again
1271 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1272 nm = nullptr;
1273 }
1274 }
1275 }
1276 if (nm != nullptr && current->is_interp_only_mode()) {
1277 // Normally we never get an nm if is_interp_only_mode() is true, because
1278 // policy()->event has a check for this and won't compile the method when
1279 // true. However, it's possible for is_interp_only_mode() to become true
1280 // during the compilation. We don't want to return the nm in that case
1281 // because we want to continue to execute interpreted.
1282 nm = nullptr;
1283 }
1284 #ifndef PRODUCT
1285 if (TraceOnStackReplacement) {
1286 if (nm != nullptr) {
1287 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1288 nm->print();
1289 }
1290 }
1291 #endif
1292 return nm;
1293 }
1294
1295 JRT_ENTRY(nmethod*,
1296 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1297 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1298 // flag, in case this method triggers classloading which will call into Java.
1299 UnlockFlagSaver fs(current);
1300
1301 LastFrameAccessor last_frame(current);
1302 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1303 methodHandle method(current, last_frame.method());
1304 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1305 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1306
1307 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1308
1309 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1310 if (osr_nm != nullptr && bs_nm != nullptr) {
1311 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1312 osr_nm = nullptr;
1313 }
1314 }
1315 return osr_nm;
1316 JRT_END
1317
1318 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1319 assert(ProfileInterpreter, "must be profiling interpreter");
1320 int bci = method->bci_from(cur_bcp);
1321 MethodData* mdo = method->method_data();
1322 if (mdo == nullptr) return 0;
1323 return mdo->bci_to_di(bci);
1324 JRT_END
1325
1326 #ifdef ASSERT
1327 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1328 assert(ProfileInterpreter, "must be profiling interpreter");
1329
1330 MethodData* mdo = method->method_data();
1331 assert(mdo != nullptr, "must not be null");
1332
1333 int bci = method->bci_from(bcp);
1334
1335 address mdp2 = mdo->bci_to_dp(bci);
1336 if (mdp != mdp2) {
1337 ResourceMark rm;
1338 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1339 int current_di = mdo->dp_to_di(mdp);
1340 int expected_di = mdo->dp_to_di(mdp2);
1341 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1342 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1343 int approx_bci = -1;
1344 if (current_di >= 0) {
1345 approx_bci = mdo->data_at(current_di)->bci();
1346 }
1347 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1348 mdo->print_on(tty);
1349 method->print_codes();
1350 }
1351 assert(mdp == mdp2, "wrong mdp");
1352 JRT_END
1353 #endif // ASSERT
1354
1355 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1356 assert(ProfileInterpreter, "must be profiling interpreter");
1357 ResourceMark rm(current);
1358 LastFrameAccessor last_frame(current);
1359 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1360 MethodData* h_mdo = last_frame.method()->method_data();
1361
1362 // Grab a lock to ensure atomic access to setting the return bci and
1363 // the displacement. This can block and GC, invalidating all naked oops.
1364 MutexLocker ml(RetData_lock);
1365
1366 // ProfileData is essentially a wrapper around a derived oop, so we
1367 // need to take the lock before making any ProfileData structures.
1368 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1369 guarantee(data != nullptr, "profile data must be valid");
1370 RetData* rdata = data->as_RetData();
1371 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1372 last_frame.set_mdp(new_mdp);
1373 JRT_END
1374
1375 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1376 return Method::build_method_counters(current, m);
1377 JRT_END
1378
1379
1380 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1381 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1382 // stack traversal automatically takes care of preserving arguments for invoke, so
1383 // this is no longer needed.
1384
1385 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1386 // if this is called during a safepoint
1387
1388 if (JvmtiExport::should_post_single_step()) {
1389 // This function is called by the interpreter when single stepping. Such single
1390 // stepping could unwind a frame. Then, it is important that we process any frames
1391 // that we might return into.
1392 StackWatermarkSet::before_unwind(current);
1393
1394 // We are called during regular safepoints and when the VM is
1395 // single stepping. If any thread is marked for single stepping,
1396 // then we may have JVMTI work to do.
1397 LastFrameAccessor last_frame(current);
1398 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1399 }
1400 JRT_END
1401
1402 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1403 assert(current == JavaThread::current(), "pre-condition");
1404 // This function is called by the interpreter when the return poll found a reason
1405 // to call the VM. The reason could be that we are returning into a not yet safe
1406 // to access frame. We handle that below.
1407 // Note that this path does not check for single stepping, because we do not want
1408 // to single step when unwinding frames for an exception being thrown. Instead,
1409 // such single stepping code will use the safepoint table, which will use the
1410 // InterpreterRuntime::at_safepoint callback.
1411 StackWatermarkSet::before_unwind(current);
1412 JRT_END
1413
1414 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1415 ConstantPoolCacheEntry *cp_entry))
1416
1417 // check the access_flags for the field in the klass
1418
1419 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1420 int index = cp_entry->field_index();
1421 if (!ik->field_status(index).is_access_watched()) return;
1422
1423 bool is_static = (obj == nullptr);
1424 bool is_inlined = cp_entry->is_inlined();
1425 HandleMark hm(current);
1426
1427 Handle h_obj;
1428 if (!is_static) {
1429 // non-static field accessors have an object, but we need a handle
1430 h_obj = Handle(current, obj);
1431 }
1432 InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1433 jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static, is_inlined);
1434 LastFrameAccessor last_frame(current);
1435 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), cp_entry_f1, h_obj, fid);
1436 JRT_END
1437
1438 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1439 ConstantPoolCacheEntry *cp_entry, jvalue *value))
1440
1441 Klass* k = cp_entry->f1_as_klass();
1442
1443 // check the access_flags for the field in the klass
1444 InstanceKlass* ik = InstanceKlass::cast(k);
1445 int index = cp_entry->field_index();
1446 // bail out if field modifications are not watched
1447 if (!ik->field_status(index).is_modification_watched()) return;
1448
1449 char sig_type = '\0';
1450
1451 switch(cp_entry->flag_state()) {
1452 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1453 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1454 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1455 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1456 case itos: sig_type = JVM_SIGNATURE_INT; break;
1457 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1458 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1459 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1460 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1461 default: ShouldNotReachHere(); return;
1462 }
1463
1464 // Both Q-signatures and L-signatures are mapped to atos
1465 if (cp_entry->flag_state() == atos && ik->field_signature(index)->is_Q_signature()) {
1466 sig_type = JVM_SIGNATURE_PRIMITIVE_OBJECT;
1467 }
1468
1469 bool is_static = (obj == nullptr);
1470 bool is_inlined = cp_entry->is_inlined();
1471
1472 HandleMark hm(current);
1473 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static, is_inlined);
1474 jvalue fvalue;
1475 #ifdef _LP64
1476 fvalue = *value;
1477 #else
1478 // Long/double values are stored unaligned and also noncontiguously with
1479 // tagged stacks. We can't just do a simple assignment even in the non-
1480 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1481 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1482 // We assume that the two halves of longs/doubles are stored in interpreter
1483 // stack slots in platform-endian order.
1484 jlong_accessor u;
1485 jint* newval = (jint*)value;
1486 u.words[0] = newval[0];
1487 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1488 fvalue.j = u.long_value;
1489 #endif // _LP64
1490
1491 Handle h_obj;
1492 if (!is_static) {
1493 // non-static field accessors have an object, but we need a handle
1494 h_obj = Handle(current, obj);
1495 }
1496
1497 LastFrameAccessor last_frame(current);
1498 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1499 fid, sig_type, &fvalue);
1500 JRT_END
1501
1502 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1503 LastFrameAccessor last_frame(current);
1504 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1505 JRT_END
1506
1507
1508 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1509 // before transitioning to VM, and restore it after transitioning back
1510 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1511 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1512 LastFrameAccessor last_frame(current);
1513 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1514 JRT_END
1515
1516 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1517 {
1518 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1519 }
1520 JRT_END
1521
1522
1523 // Implementation of SignatureHandlerLibrary
1524
1525 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1526 // Dummy definition (else normalization method is defined in CPU
1527 // dependent code)
1528 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1529 return fingerprint;
1530 }
1531 #endif
1532
1533 address SignatureHandlerLibrary::set_handler_blob() {
1534 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1535 if (handler_blob == nullptr) {
1536 return nullptr;
1537 }
1538 address handler = handler_blob->code_begin();
1539 _handler_blob = handler_blob;
1540 _handler = handler;
1541 return handler;
1542 }
1543
1544 void SignatureHandlerLibrary::initialize() {
1545 if (_fingerprints != nullptr) {
1546 return;
1547 }
1548 if (set_handler_blob() == nullptr) {
1549 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1550 }
1551
1552 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1553 SignatureHandlerLibrary::buffer_size);
1554 _buffer = bb->code_begin();
1555
1556 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1557 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1558 }
1559
1560 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1561 address handler = _handler;
1562 int insts_size = buffer->pure_insts_size();
1563 if (handler + insts_size > _handler_blob->code_end()) {
1564 // get a new handler blob
1565 handler = set_handler_blob();
1566 }
1567 if (handler != nullptr) {
1568 memcpy(handler, buffer->insts_begin(), insts_size);
1569 pd_set_handler(handler);
1570 ICache::invalidate_range(handler, insts_size);
1571 _handler = handler + insts_size;
1572 }
1573 return handler;
1574 }
1575
1576 void SignatureHandlerLibrary::add(const methodHandle& method) {
1577 if (method->signature_handler() == nullptr) {
1578 // use slow signature handler if we can't do better
1579 int handler_index = -1;
1580 // check if we can use customized (fast) signature handler
1581 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1582 // use customized signature handler
1583 MutexLocker mu(SignatureHandlerLibrary_lock);
1584 // make sure data structure is initialized
1585 initialize();
1586 // lookup method signature's fingerprint
1587 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1588 // allow CPU dependent code to optimize the fingerprints for the fast handler
1589 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1590 handler_index = _fingerprints->find(fingerprint);
1591 // create handler if necessary
1592 if (handler_index < 0) {
1593 ResourceMark rm;
1594 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1595 CodeBuffer buffer((address)(_buffer + align_offset),
1596 SignatureHandlerLibrary::buffer_size - align_offset);
1597 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1598 // copy into code heap
1599 address handler = set_handler(&buffer);
1600 if (handler == nullptr) {
1601 // use slow signature handler (without memorizing it in the fingerprints)
1602 } else {
1603 // debugging support
1604 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1605 ttyLocker ttyl;
1606 tty->cr();
1607 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1608 _handlers->length(),
1609 (method->is_static() ? "static" : "receiver"),
1610 method->name_and_sig_as_C_string(),
1611 fingerprint,
1612 buffer.insts_size());
1613 if (buffer.insts_size() > 0) {
1614 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1615 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1616 }
1617 #ifndef PRODUCT
1618 address rh_begin = Interpreter::result_handler(method()->result_type());
1619 if (CodeCache::contains(rh_begin)) {
1620 // else it might be special platform dependent values
1621 tty->print_cr(" --- associated result handler ---");
1622 address rh_end = rh_begin;
1623 while (*(int*)rh_end != 0) {
1624 rh_end += sizeof(int);
1625 }
1626 Disassembler::decode(rh_begin, rh_end);
1627 } else {
1628 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1629 }
1630 #endif
1631 }
1632 // add handler to library
1633 _fingerprints->append(fingerprint);
1634 _handlers->append(handler);
1635 // set handler index
1636 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1637 handler_index = _fingerprints->length() - 1;
1638 }
1639 }
1640 // Set handler under SignatureHandlerLibrary_lock
1641 if (handler_index < 0) {
1642 // use generic signature handler
1643 method->set_signature_handler(Interpreter::slow_signature_handler());
1644 } else {
1645 // set handler
1646 method->set_signature_handler(_handlers->at(handler_index));
1647 }
1648 } else {
1649 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1650 // use generic signature handler
1651 method->set_signature_handler(Interpreter::slow_signature_handler());
1652 }
1653 }
1654 #ifdef ASSERT
1655 int handler_index = -1;
1656 int fingerprint_index = -2;
1657 {
1658 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1659 // in any way if accessed from multiple threads. To avoid races with another
1660 // thread which may change the arrays in the above, mutex protected block, we
1661 // have to protect this read access here with the same mutex as well!
1662 MutexLocker mu(SignatureHandlerLibrary_lock);
1663 if (_handlers != nullptr) {
1664 handler_index = _handlers->find(method->signature_handler());
1665 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1666 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1667 fingerprint_index = _fingerprints->find(fingerprint);
1668 }
1669 }
1670 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1671 handler_index == fingerprint_index, "sanity check");
1672 #endif // ASSERT
1673 }
1674
1675 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1676 int handler_index = -1;
1677 // use customized signature handler
1678 MutexLocker mu(SignatureHandlerLibrary_lock);
1679 // make sure data structure is initialized
1680 initialize();
1681 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1682 handler_index = _fingerprints->find(fingerprint);
1683 // create handler if necessary
1684 if (handler_index < 0) {
1685 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1686 tty->cr();
1687 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1688 _handlers->length(),
1689 p2i(handler),
1690 fingerprint);
1691 }
1692 _fingerprints->append(fingerprint);
1693 _handlers->append(handler);
1694 } else {
1695 if (PrintSignatureHandlers) {
1696 tty->cr();
1697 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1698 _handlers->length(),
1699 fingerprint,
1700 p2i(_handlers->at(handler_index)),
1701 p2i(handler));
1702 }
1703 }
1704 }
1705
1706
1707 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1708 address SignatureHandlerLibrary::_handler = nullptr;
1709 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1710 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1711 address SignatureHandlerLibrary::_buffer = nullptr;
1712
1713
1714 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1715 methodHandle m(current, method);
1716 assert(m->is_native(), "sanity check");
1717 // lookup native function entry point if it doesn't exist
1718 if (!m->has_native_function()) {
1719 NativeLookup::lookup(m, CHECK);
1720 }
1721 // make sure signature handler is installed
1722 SignatureHandlerLibrary::add(m);
1723 // The interpreter entry point checks the signature handler first,
1724 // before trying to fetch the native entry point and klass mirror.
1725 // We must set the signature handler last, so that multiple processors
1726 // preparing the same method will be sure to see non-null entry & mirror.
1727 JRT_END
1728
1729 #if defined(IA32) || defined(AMD64) || defined(ARM)
1730 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1731 assert(current == JavaThread::current(), "pre-condition");
1732 if (src_address == dest_address) {
1733 return;
1734 }
1735 ResourceMark rm;
1736 LastFrameAccessor last_frame(current);
1737 assert(last_frame.is_interpreted_frame(), "");
1738 jint bci = last_frame.bci();
1739 methodHandle mh(current, last_frame.method());
1740 Bytecode_invoke invoke(mh, bci);
1741 ArgumentSizeComputer asc(invoke.signature());
1742 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1743 Copy::conjoint_jbytes(src_address, dest_address,
1744 size_of_arguments * Interpreter::stackElementSize);
1745 JRT_END
1746 #endif
1747
1748 #if INCLUDE_JVMTI
1749 // This is a support of the JVMTI PopFrame interface.
1750 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1751 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1752 // The member_name argument is a saved reference (in local#0) to the member_name.
1753 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1754 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1755 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1756 Method* method, address bcp))
1757 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1758 if (code != Bytecodes::_invokestatic) {
1759 return;
1760 }
1761 ConstantPool* cpool = method->constants();
1762 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1763 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1764 Symbol* mname = cpool->name_ref_at(cp_index);
1765
1766 if (MethodHandles::has_member_arg(cname, mname)) {
1767 oop member_name_oop = cast_to_oop(member_name);
1768 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1769 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1770 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1771 }
1772 current->set_vm_result(member_name_oop);
1773 } else {
1774 current->set_vm_result(nullptr);
1775 }
1776 JRT_END
1777 #endif // INCLUDE_JVMTI
1778
1779 #ifndef PRODUCT
1780 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1781 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1782 // The generated code still uses call_VM because that will set up the frame pointer for
1783 // bcp and method.
1784 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1785 assert(current == JavaThread::current(), "pre-condition");
1786 LastFrameAccessor last_frame(current);
1787 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1788 methodHandle mh(current, last_frame.method());
1789 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1790 return preserve_this_value;
1791 JRT_END
1792 #endif // !PRODUCT