1 /*
2 * Copyright (c) 1997, 2025, 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.inline.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/method.inline.hpp"
56 #include "oops/objArrayKlass.hpp"
57 #include "oops/objArrayOop.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/symbol.hpp"
60 #include "prims/jvmtiExport.hpp"
61 #include "prims/methodHandles.hpp"
62 #include "prims/nativeLookup.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/fieldDescriptor.inline.hpp"
67 #include "runtime/frame.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/icache.hpp"
70 #include "runtime/interfaceSupport.inline.hpp"
71 #include "runtime/java.hpp"
72 #include "runtime/javaCalls.hpp"
73 #include "runtime/jfieldIDWorkaround.hpp"
74 #include "runtime/osThread.hpp"
75 #include "runtime/sharedRuntime.hpp"
76 #include "runtime/stackWatermarkSet.hpp"
77 #include "runtime/stubRoutines.hpp"
78 #include "runtime/synchronizer.inline.hpp"
79 #include "runtime/threadCritical.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/globalDefinitions.hpp"
85 #ifdef COMPILER2
86 #include "opto/runtime.hpp"
87 #endif
88
89 // Helper class to access current interpreter state
90 class LastFrameAccessor : public StackObj {
91 frame _last_frame;
92 public:
93 LastFrameAccessor(JavaThread* current) {
94 assert(current == Thread::current(), "sanity");
95 _last_frame = current->last_frame();
96 }
97 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
98 Method* method() const { return _last_frame.interpreter_frame_method(); }
99 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
100 int bci() const { return _last_frame.interpreter_frame_bci(); }
101 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
102
103 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
104 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
105
106 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
107 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
108
109 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
110 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
111 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(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
115 oop callee_receiver(Symbol* signature) {
116 return _last_frame.interpreter_callee_receiver(signature);
117 }
118 BasicObjectLock* monitor_begin() const {
119 return _last_frame.interpreter_frame_monitor_begin();
120 }
121 BasicObjectLock* monitor_end() const {
122 return _last_frame.interpreter_frame_monitor_end();
123 }
124 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
125 return _last_frame.next_monitor_in_interpreter_frame(current);
126 }
127
128 frame& get_frame() { return _last_frame; }
129 };
130
131 //------------------------------------------------------------------------------------------------------------------------
132 // State accessors
133
134 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
135 LastFrameAccessor last_frame(current);
136 last_frame.set_bcp(bcp);
137 if (ProfileInterpreter) {
138 // ProfileTraps uses MDOs independently of ProfileInterpreter.
139 // That is why we must check both ProfileInterpreter and mdo != nullptr.
140 MethodData* mdo = last_frame.method()->method_data();
141 if (mdo != nullptr) {
142 NEEDS_CLEANUP;
143 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
144 }
145 }
146 }
147
148 //------------------------------------------------------------------------------------------------------------------------
149 // Constants
150
151
152 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
153 // access constant pool
154 LastFrameAccessor last_frame(current);
155 ConstantPool* pool = last_frame.method()->constants();
156 int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
157 constantTag tag = pool->tag_at(cp_index);
158
159 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
160 Klass* klass = pool->klass_at(cp_index, CHECK);
161 oop java_class = klass->java_mirror();
162 current->set_vm_result(java_class);
163 JRT_END
164
165 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
166 assert(bytecode == Bytecodes::_ldc ||
167 bytecode == Bytecodes::_ldc_w ||
168 bytecode == Bytecodes::_ldc2_w ||
169 bytecode == Bytecodes::_fast_aldc ||
170 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
171 ResourceMark rm(current);
172 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
173 bytecode == Bytecodes::_fast_aldc_w);
174 LastFrameAccessor last_frame(current);
175 methodHandle m (current, last_frame.method());
176 Bytecode_loadconstant ldc(m, last_frame.bci());
177
178 // Double-check the size. (Condy can have any type.)
179 BasicType type = ldc.result_type();
180 switch (type2size[type]) {
181 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
182 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
183 default: ShouldNotReachHere();
184 }
185
186 // Resolve the constant. This does not do unboxing.
187 // But it does replace Universe::the_null_sentinel by null.
188 oop result = ldc.resolve_constant(CHECK);
189 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
190
191 #ifdef ASSERT
192 {
193 // The bytecode wrappers aren't GC-safe so construct a new one
194 Bytecode_loadconstant ldc2(m, last_frame.bci());
195 int rindex = ldc2.cache_index();
196 if (rindex < 0)
197 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
198 if (rindex >= 0) {
199 oop coop = m->constants()->resolved_reference_at(rindex);
200 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
201 assert(roop == coop, "expected result for assembly code");
202 }
203 }
204 #endif
205 current->set_vm_result(result);
206 if (!is_fast_aldc) {
207 // Tell the interpreter how to unbox the primitive.
208 guarantee(java_lang_boxing_object::is_instance(result, type), "");
209 int offset = java_lang_boxing_object::value_offset(type);
210 intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift)
211 | (offset & ConstantPoolCache::field_index_mask));
212 current->set_vm_result_2((Metadata*)flags);
213 }
214 }
215 JRT_END
216
217
218 //------------------------------------------------------------------------------------------------------------------------
219 // Allocation
220
221 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
222 Klass* k = pool->klass_at(index, CHECK);
223 InstanceKlass* klass = InstanceKlass::cast(k);
224
225 // Make sure we are not instantiating an abstract klass
226 klass->check_valid_for_instantiation(true, CHECK);
227
228 // Make sure klass is initialized
229 klass->initialize(CHECK);
230
231 oop obj = klass->allocate_instance(CHECK);
232 current->set_vm_result(obj);
233 JRT_END
234
235 JRT_ENTRY(void, InterpreterRuntime::uninitialized_static_inline_type_field(JavaThread* current, oopDesc* mirror, ResolvedFieldEntry* entry))
236 // The interpreter tries to access an inline static field that has not been initialized.
237 // This situation can happen in different scenarios:
238 // 1 - if the load or initialization of the field failed during step 8 of
239 // the initialization of the holder of the field, in this case the access to the field
240 // must fail
241 // 2 - it can also happen when the initialization of the holder class triggered the initialization of
242 // another class which accesses this field in its static initializer, in this case the
243 // access must succeed to allow circularity
244 // The code below tries to load and initialize the field's class again before returning the default value.
245 // If the field was not initialized because of an error, an exception should be thrown.
246 // If the class is being initialized, the default value is returned.
247 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
248 instanceHandle mirror_h(THREAD, (instanceOop)mirror);
249 InstanceKlass* klass = entry->field_holder();
250 u2 index = entry->field_index();
251 assert(klass == java_lang_Class::as_Klass(mirror), "Not the field holder klass");
252 assert(klass->field_is_null_free_inline_type(index), "Sanity check");
253 if (klass->is_being_initialized() && klass->is_reentrant_initialization(THREAD)) {
254 int offset = klass->field_offset(index);
255 Klass* field_k = klass->get_inline_type_field_klass_or_null(index);
256 if (field_k == nullptr) {
257 field_k = SystemDictionary::resolve_or_fail(klass->field_signature(index)->fundamental_name(THREAD),
258 Handle(THREAD, klass->class_loader()),
259 Handle(THREAD, klass->protection_domain()),
260 true, CHECK);
261 assert(field_k != nullptr, "Should have been loaded or an exception thrown above");
262 if (!field_k->is_inline_klass()) {
263 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
264 err_msg("class %s expects class %s to be a concrete value class but it is not",
265 klass->name()->as_C_string(), field_k->external_name()));
266 }
267 InlineLayoutInfo* li = klass->inline_layout_info_adr(index);
268 li->set_klass(InlineKlass::cast(field_k));
269 li->set_kind(LayoutKind::REFERENCE);
270 }
271 field_k->initialize(CHECK);
272 oop defaultvalue = InlineKlass::cast(field_k)->default_value();
273 // It is safe to initialize the static field because 1) the current thread is the initializing thread
274 // and is the only one that can access it, and 2) the field is actually not initialized (i.e. null)
275 // otherwise the JVM should not be executing this code.
276 mirror_h()->obj_field_put(offset, defaultvalue);
277 current->set_vm_result(defaultvalue);
278 } else {
279 assert(klass->is_in_error_state(), "If not initializing, initialization must have failed to get there");
280 ResourceMark rm(THREAD);
281 const char* desc = "Could not initialize class ";
282 const char* className = klass->external_name();
283 size_t msglen = strlen(desc) + strlen(className) + 1;
284 char* message = NEW_RESOURCE_ARRAY(char, msglen);
285 if (nullptr == message) {
286 // Out of memory: can't create detailed error message
287 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
288 } else {
289 jio_snprintf(message, msglen, "%s%s", desc, className);
290 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
291 }
292 }
293 JRT_END
294
295 JRT_ENTRY(void, InterpreterRuntime::read_flat_field(JavaThread* current, oopDesc* obj, ResolvedFieldEntry* entry))
296 assert(oopDesc::is_oop(obj), "Sanity check");
297 Handle obj_h(THREAD, obj);
298
299 InstanceKlass* holder = InstanceKlass::cast(entry->field_holder());
300 assert(entry->field_holder()->field_is_flat(entry->field_index()), "Sanity check");
301
302 InlineLayoutInfo* layout_info = holder->inline_layout_info_adr(entry->field_index());
303 InlineKlass* field_vklass = layout_info->klass();
304
305 #ifdef ASSERT
306 fieldDescriptor fd;
307 bool found = holder->find_field_from_offset(entry->field_offset(), false, &fd);
308 assert(found, "Field not found");
309 assert(fd.is_flat(), "Field must be flat");
310 #endif // ASSERT
311
312 oop res = field_vklass->read_payload_from_addr(obj_h(), entry->field_offset(), layout_info->kind(), CHECK);
313 current->set_vm_result(res);
314 JRT_END
315
316 JRT_ENTRY(void, InterpreterRuntime::read_nullable_flat_field(JavaThread* current, oopDesc* obj, ResolvedFieldEntry* entry))
317 assert(oopDesc::is_oop(obj), "Sanity check");
318 assert(entry->has_null_marker(), "Otherwise should not get there");
319 Handle obj_h(THREAD, obj);
320
321 InstanceKlass* holder = entry->field_holder();
322 int field_index = entry->field_index();
323 InlineLayoutInfo* li= holder->inline_layout_info_adr(field_index);
324
325 #ifdef ASSERT
326 fieldDescriptor fd;
327 bool found = holder->find_field_from_offset(entry->field_offset(), false, &fd);
328 assert(found, "Field not found");
329 assert(fd.is_flat(), "Field must be flat");
330 #endif // ASSERT
331
332 InlineKlass* field_vklass = InlineKlass::cast(li->klass());
333 oop res = field_vklass->read_payload_from_addr(obj_h(), entry->field_offset(), li->kind(), CHECK);
334 current->set_vm_result(res);
335
336 JRT_END
337
338 JRT_ENTRY(void, InterpreterRuntime::write_nullable_flat_field(JavaThread* current, oopDesc* obj, oopDesc* value, ResolvedFieldEntry* entry))
339 assert(oopDesc::is_oop(obj), "Sanity check");
340 Handle obj_h(THREAD, obj);
341 assert(value == nullptr || oopDesc::is_oop(value), "Sanity check");
342 Handle val_h(THREAD, value);
343
344 InstanceKlass* holder = entry->field_holder();
345 InlineLayoutInfo* li = holder->inline_layout_info_adr(entry->field_index());
346 InlineKlass* vk = li->klass();
347 vk->write_value_to_addr(val_h(), ((char*)(oopDesc*)obj_h()) + entry->field_offset(), li->kind(), true, CHECK);
348 JRT_END
349
350 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
351 oop obj = oopFactory::new_typeArray(type, size, CHECK);
352 current->set_vm_result(obj);
353 JRT_END
354
355
356 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
357 Klass* klass = pool->klass_at(index, CHECK);
358 arrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
359 current->set_vm_result(obj);
360 JRT_END
361
362 JRT_ENTRY(void, InterpreterRuntime::flat_array_load(JavaThread* current, arrayOopDesc* array, int index))
363 assert(array->is_flatArray(), "Must be");
364 flatArrayOop farray = (flatArrayOop)array;
365 oop res = farray->read_value_from_flat_array(index, CHECK);
366 current->set_vm_result(res);
367 JRT_END
368
369 JRT_ENTRY(void, InterpreterRuntime::flat_array_store(JavaThread* current, oopDesc* val, arrayOopDesc* array, int index))
370 assert(array->is_flatArray(), "Must be");
371 flatArrayOop farray = (flatArrayOop)array;
372 farray->write_value_to_flat_array(val, index, CHECK);
373 JRT_END
374
375 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
376 // We may want to pass in more arguments - could make this slightly faster
377 LastFrameAccessor last_frame(current);
378 ConstantPool* constants = last_frame.method()->constants();
379 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
380 Klass* klass = constants->klass_at(i, CHECK);
381 int nof_dims = last_frame.number_of_dimensions();
382 assert(klass->is_klass(), "not a class");
383 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
384
385 // We must create an array of jints to pass to multi_allocate.
386 ResourceMark rm(current);
387 const int small_dims = 10;
388 jint dim_array[small_dims];
389 jint *dims = &dim_array[0];
390 if (nof_dims > small_dims) {
391 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
392 }
393 for (int index = 0; index < nof_dims; index++) {
394 // offset from first_size_address is addressed as local[index]
395 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
396 dims[index] = first_size_address[n];
397 }
398 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
399 current->set_vm_result(obj);
400 JRT_END
401
402
403 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
404 assert(oopDesc::is_oop(obj), "must be a valid oop");
405 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
406 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
407 JRT_END
408
409 JRT_ENTRY(jboolean, InterpreterRuntime::is_substitutable(JavaThread* current, oopDesc* aobj, oopDesc* bobj))
410 assert(oopDesc::is_oop(aobj) && oopDesc::is_oop(bobj), "must be valid oops");
411
412 Handle ha(THREAD, aobj);
413 Handle hb(THREAD, bobj);
414 JavaValue result(T_BOOLEAN);
415 JavaCallArguments args;
416 args.push_oop(ha);
417 args.push_oop(hb);
418 methodHandle method(current, Universe::is_substitutable_method());
419 method->method_holder()->initialize(CHECK_false); // Ensure class ValueObjectMethods is initialized
420 JavaCalls::call(&result, method, &args, THREAD);
421 if (HAS_PENDING_EXCEPTION) {
422 // Something really bad happened because isSubstitutable() should not throw exceptions
423 // If it is an error, just let it propagate
424 // If it is an exception, wrap it into an InternalError
425 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
426 Handle e(THREAD, PENDING_EXCEPTION);
427 CLEAR_PENDING_EXCEPTION;
428 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in substitutability test", e, false);
429 }
430 }
431 return result.get_jboolean();
432 JRT_END
433
434 // Quicken instance-of and check-cast bytecodes
435 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
436 // Force resolving; quicken the bytecode
437 LastFrameAccessor last_frame(current);
438 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
439 ConstantPool* cpool = last_frame.method()->constants();
440 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
441 // program we might have seen an unquick'd bytecode in the interpreter but have another
442 // thread quicken the bytecode before we get here.
443 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
444 Klass* klass = cpool->klass_at(which, CHECK);
445 current->set_vm_result_2(klass);
446 JRT_END
447
448
449 //------------------------------------------------------------------------------------------------------------------------
450 // Exceptions
451
452 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
453 const methodHandle& trap_method, int trap_bci) {
454 if (trap_method.not_null()) {
455 MethodData* trap_mdo = trap_method->method_data();
456 if (trap_mdo == nullptr) {
457 ExceptionMark em(current);
458 JavaThread* THREAD = current; // For exception macros.
459 Method::build_profiling_method_data(trap_method, THREAD);
460 if (HAS_PENDING_EXCEPTION) {
461 // Only metaspace OOM is expected. No Java code executed.
462 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
463 "we expect only an OOM error here");
464 CLEAR_PENDING_EXCEPTION;
465 }
466 trap_mdo = trap_method->method_data();
467 // and fall through...
468 }
469 if (trap_mdo != nullptr) {
470 // Update per-method count of trap events. The interpreter
471 // is updating the MDO to simulate the effect of compiler traps.
472 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
473 }
474 }
475 }
476
477 // Assume the compiler is (or will be) interested in this event.
478 // If necessary, create an MDO to hold the information, and record it.
479 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
480 assert(ProfileTraps, "call me only if profiling");
481 LastFrameAccessor last_frame(current);
482 methodHandle trap_method(current, last_frame.method());
483 int trap_bci = trap_method->bci_from(last_frame.bcp());
484 note_trap_inner(current, reason, trap_method, trap_bci);
485 }
486
487 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
488 // get klass
489 InstanceKlass* klass = InstanceKlass::cast(k);
490 assert(klass->is_initialized(),
491 "this klass should have been initialized during VM initialization");
492 // create instance - do not call constructor since we may have no
493 // (java) stack space left (should assert constructor is empty)
494 Handle exception;
495 oop exception_oop = klass->allocate_instance(CHECK_(exception));
496 exception = Handle(THREAD, exception_oop);
497 if (StackTraceInThrowable) {
498 java_lang_Throwable::fill_in_stack_trace(exception);
499 }
500 return exception;
501 }
502
503 // Special handling for stack overflow: since we don't have any (java) stack
504 // space left we use the pre-allocated & pre-initialized StackOverflowError
505 // klass to create an stack overflow error instance. We do not call its
506 // constructor for the same reason (it is empty, anyway).
507 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
508 Handle exception = get_preinitialized_exception(
509 vmClasses::StackOverflowError_klass(),
510 CHECK);
511 // Increment counter for hs_err file reporting
512 Atomic::inc(&Exceptions::_stack_overflow_errors);
513 // Remove the ScopedValue bindings in case we got a StackOverflowError
514 // while we were trying to manipulate ScopedValue bindings.
515 current->clear_scopedValueBindings();
516 THROW_HANDLE(exception);
517 JRT_END
518
519 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
520 Handle exception = get_preinitialized_exception(
521 vmClasses::StackOverflowError_klass(),
522 CHECK);
523 java_lang_Throwable::set_message(exception(),
524 Universe::delayed_stack_overflow_error_message());
525 // Increment counter for hs_err file reporting
526 Atomic::inc(&Exceptions::_stack_overflow_errors);
527 // Remove the ScopedValue bindings in case we got a StackOverflowError
528 // while we were trying to manipulate ScopedValue bindings.
529 current->clear_scopedValueBindings();
530 THROW_HANDLE(exception);
531 JRT_END
532
533 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
534 // lookup exception klass
535 TempNewSymbol s = SymbolTable::new_symbol(name);
536 if (ProfileTraps) {
537 if (s == vmSymbols::java_lang_ArithmeticException()) {
538 note_trap(current, Deoptimization::Reason_div0_check);
539 } else if (s == vmSymbols::java_lang_NullPointerException()) {
540 note_trap(current, Deoptimization::Reason_null_check);
541 }
542 }
543 // create exception
544 Handle exception = Exceptions::new_exception(current, s, message);
545 current->set_vm_result(exception());
546 JRT_END
547
548
549 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
550 // Produce the error message first because note_trap can safepoint
551 ResourceMark rm(current);
552 const char* klass_name = obj->klass()->external_name();
553 // lookup exception klass
554 TempNewSymbol s = SymbolTable::new_symbol(name);
555 if (ProfileTraps) {
556 if (s == vmSymbols::java_lang_ArrayStoreException()) {
557 note_trap(current, Deoptimization::Reason_array_check);
558 } else {
559 note_trap(current, Deoptimization::Reason_class_check);
560 }
561 }
562 // create exception, with klass name as detail message
563 Handle exception = Exceptions::new_exception(current, s, klass_name);
564 current->set_vm_result(exception());
565 JRT_END
566
567 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
568 // Produce the error message first because note_trap can safepoint
569 ResourceMark rm(current);
570 stringStream ss;
571 ss.print("Index %d out of bounds for length %d", index, a->length());
572
573 if (ProfileTraps) {
574 note_trap(current, Deoptimization::Reason_range_check);
575 }
576
577 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
578 JRT_END
579
580 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
581 JavaThread* current, oopDesc* obj))
582
583 // Produce the error message first because note_trap can safepoint
584 ResourceMark rm(current);
585 char* message = SharedRuntime::generate_class_cast_message(
586 current, obj->klass());
587
588 if (ProfileTraps) {
589 note_trap(current, Deoptimization::Reason_class_check);
590 }
591
592 // create exception
593 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
594 JRT_END
595
596 // exception_handler_for_exception(...) returns the continuation address,
597 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
598 // The exception oop is returned to make sure it is preserved over GC (it
599 // is only on the stack if the exception was thrown explicitly via athrow).
600 // During this operation, the expression stack contains the values for the
601 // bci where the exception happened. If the exception was propagated back
602 // from a call, the expression stack contains the values for the bci at the
603 // invoke w/o arguments (i.e., as if one were inside the call).
604 // Note that the implementation of this method assumes it's only called when an exception has actually occured
605 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
606 // We get here after we have unwound from a callee throwing an exception
607 // into the interpreter. Any deferred stack processing is notified of
608 // the event via the StackWatermarkSet.
609 StackWatermarkSet::after_unwind(current);
610
611 LastFrameAccessor last_frame(current);
612 Handle h_exception(current, exception);
613 methodHandle h_method (current, last_frame.method());
614 constantPoolHandle h_constants(current, h_method->constants());
615 bool should_repeat;
616 int handler_bci;
617 int current_bci = last_frame.bci();
618
619 if (current->frames_to_pop_failed_realloc() > 0) {
620 // Allocation of scalar replaced object used in this frame
621 // failed. Unconditionally pop the frame.
622 current->dec_frames_to_pop_failed_realloc();
623 current->set_vm_result(h_exception());
624 // If the method is synchronized we already unlocked the monitor
625 // during deoptimization so the interpreter needs to skip it when
626 // the frame is popped.
627 current->set_do_not_unlock_if_synchronized(true);
628 return Interpreter::remove_activation_entry();
629 }
630
631 // Need to do this check first since when _do_not_unlock_if_synchronized
632 // is set, we don't want to trigger any classloading which may make calls
633 // into java, or surprisingly find a matching exception handler for bci 0
634 // since at this moment the method hasn't been "officially" entered yet.
635 if (current->do_not_unlock_if_synchronized()) {
636 ResourceMark rm;
637 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
638 current->set_vm_result(exception);
639 return Interpreter::remove_activation_entry();
640 }
641
642 do {
643 should_repeat = false;
644
645 // assertions
646 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
647 // Check that exception is a subclass of Throwable.
648 assert(h_exception->is_a(vmClasses::Throwable_klass()),
649 "Exception not subclass of Throwable");
650
651 // tracing
652 if (log_is_enabled(Info, exceptions)) {
653 ResourceMark rm(current);
654 stringStream tempst;
655 tempst.print("interpreter method <%s>\n"
656 " at bci %d for thread " INTPTR_FORMAT " (%s)",
657 h_method->print_value_string(), current_bci, p2i(current), current->name());
658 Exceptions::log_exception(h_exception, tempst.as_string());
659 }
660 // Don't go paging in something which won't be used.
661 // else if (extable->length() == 0) {
662 // // disabled for now - interpreter is not using shortcut yet
663 // // (shortcut is not to call runtime if we have no exception handlers)
664 // // warning("performance bug: should not call runtime if method has no exception handlers");
665 // }
666 // for AbortVMOnException flag
667 Exceptions::debug_check_abort(h_exception);
668
669 // exception handler lookup
670 Klass* klass = h_exception->klass();
671 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
672 if (HAS_PENDING_EXCEPTION) {
673 // We threw an exception while trying to find the exception handler.
674 // Transfer the new exception to the exception handle which will
675 // be set into thread local storage, and do another lookup for an
676 // exception handler for this exception, this time starting at the
677 // BCI of the exception handler which caused the exception to be
678 // thrown (bug 4307310).
679 h_exception = Handle(THREAD, PENDING_EXCEPTION);
680 CLEAR_PENDING_EXCEPTION;
681 if (handler_bci >= 0) {
682 current_bci = handler_bci;
683 should_repeat = true;
684 }
685 }
686 } while (should_repeat == true);
687
688 #if INCLUDE_JVMCI
689 if (EnableJVMCI && h_method->method_data() != nullptr) {
690 ResourceMark rm(current);
691 MethodData* mdo = h_method->method_data();
692
693 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
694 MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
695
696 ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
697 if (pdata != nullptr && pdata->is_BitData()) {
698 BitData* bit_data = (BitData*) pdata;
699 bit_data->set_exception_seen();
700 }
701 }
702 #endif
703
704 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
705 // time throw or a stack unwinding throw and accordingly notify the debugger
706 if (JvmtiExport::can_post_on_exceptions()) {
707 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
708 }
709
710 address continuation = nullptr;
711 address handler_pc = nullptr;
712 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
713 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
714 // handler in this method, or (b) after a stack overflow there is not yet
715 // enough stack space available to reprotect the stack.
716 continuation = Interpreter::remove_activation_entry();
717 #if COMPILER2_OR_JVMCI
718 // Count this for compilation purposes
719 h_method->interpreter_throwout_increment(THREAD);
720 #endif
721 } else {
722 // handler in this method => change bci/bcp to handler bci/bcp and continue there
723 handler_pc = h_method->code_base() + handler_bci;
724 h_method->set_exception_handler_entered(handler_bci); // profiling
725 #ifndef ZERO
726 set_bcp_and_mdp(handler_pc, current);
727 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
728 #else
729 continuation = (address)(intptr_t) handler_bci;
730 #endif
731 }
732
733 // notify debugger of an exception catch
734 // (this is good for exceptions caught in native methods as well)
735 if (JvmtiExport::can_post_on_exceptions()) {
736 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
737 }
738
739 current->set_vm_result(h_exception());
740 return continuation;
741 JRT_END
742
743
744 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
745 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
746 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
747 JRT_END
748
749
750 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
751 THROW(vmSymbols::java_lang_AbstractMethodError());
752 JRT_END
753
754 // This method is called from the "abstract_entry" of the interpreter.
755 // At that point, the arguments have already been removed from the stack
756 // and therefore we don't have the receiver object at our fingertips. (Though,
757 // on some platforms the receiver still resides in a register...). Thus,
758 // we have no choice but print an error message not containing the receiver
759 // type.
760 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
761 Method* missingMethod))
762 ResourceMark rm(current);
763 assert(missingMethod != nullptr, "sanity");
764 methodHandle m(current, missingMethod);
765 LinkResolver::throw_abstract_method_error(m, THREAD);
766 JRT_END
767
768 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
769 Klass* recvKlass,
770 Method* missingMethod))
771 ResourceMark rm(current);
772 methodHandle mh = methodHandle(current, missingMethod);
773 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
774 JRT_END
775
776 JRT_ENTRY(void, InterpreterRuntime::throw_InstantiationError(JavaThread* current))
777 THROW(vmSymbols::java_lang_InstantiationError());
778 JRT_END
779
780
781 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
782 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
783 JRT_END
784
785 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
786 Klass* recvKlass,
787 Klass* interfaceKlass))
788 ResourceMark rm(current);
789 char buf[1000];
790 buf[0] = '\0';
791 jio_snprintf(buf, sizeof(buf),
792 "Class %s does not implement the requested interface %s",
793 recvKlass ? recvKlass->external_name() : "nullptr",
794 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
795 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
796 JRT_END
797
798 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
799 THROW(vmSymbols::java_lang_NullPointerException());
800 JRT_END
801
802 //------------------------------------------------------------------------------------------------------------------------
803 // Fields
804 //
805
806 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
807 LastFrameAccessor last_frame(current);
808 constantPoolHandle pool(current, last_frame.method()->constants());
809 methodHandle m(current, last_frame.method());
810
811 resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, true /*initialize_holder*/, current);
812 }
813
814 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
815 methodHandle& m,
816 constantPoolHandle& pool,
817 bool initialize_holder, TRAPS) {
818 fieldDescriptor info;
819 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
820 bytecode == Bytecodes::_putstatic);
821 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
822
823 {
824 JvmtiHideSingleStepping jhss(THREAD);
825 LinkResolver::resolve_field_access(info, pool, field_index,
826 m, bytecode, initialize_holder, CHECK);
827 } // end JvmtiHideSingleStepping
828
829 // check if link resolution caused cpCache to be updated
830 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
831
832 // compute auxiliary field attributes
833 TosState state = as_TosState(info.field_type());
834
835 // Resolution of put instructions on final fields is delayed. That is required so that
836 // exceptions are thrown at the correct place (when the instruction is actually invoked).
837 // If we do not resolve an instruction in the current pass, leaving the put_code
838 // set to zero will cause the next put instruction to the same field to reresolve.
839
840 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
841 // to final instance fields with updates originating from a method different than <init>)
842 // is inhibited. A putfield instruction targeting an instance final field must throw
843 // an IllegalAccessError if the instruction is not in an instance
844 // initializer method <init>. If resolution were not inhibited, a putfield
845 // in an initializer method could be resolved in the initializer. Subsequent
846 // putfield instructions to the same field would then use cached information.
847 // As a result, those instructions would not pass through the VM. That is,
848 // checks in resolve_field_access() would not be executed for those instructions
849 // and the required IllegalAccessError would not be thrown.
850 //
851 // Also, we need to delay resolving getstatic and putstatic instructions until the
852 // class is initialized. This is required so that access to the static
853 // field will call the initialization function every time until the class
854 // is completely initialized ala. in 2.17.5 in JVM Specification.
855 InstanceKlass* klass = info.field_holder();
856 bool uninitialized_static = is_static && !klass->is_initialized();
857 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
858 info.has_initialized_final_update();
859 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
860
861 Bytecodes::Code get_code = (Bytecodes::Code)0;
862 Bytecodes::Code put_code = (Bytecodes::Code)0;
863 if (!uninitialized_static) {
864 if (is_static) {
865 get_code = Bytecodes::_getstatic;
866 } else {
867 get_code = Bytecodes::_getfield;
868 }
869 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
870 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
871 }
872 }
873
874 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
875 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile(),
876 info.is_flat(), info.is_null_free_inline_type(),
877 info.has_null_marker());
878
879 entry->fill_in(info.field_holder(), info.offset(),
880 checked_cast<u2>(info.index()), checked_cast<u1>(state),
881 static_cast<u1>(get_code), static_cast<u1>(put_code));
882 }
883
884
885 //------------------------------------------------------------------------------------------------------------------------
886 // Synchronization
887 //
888 // The interpreter's synchronization code is factored out so that it can
889 // be shared by method invocation and synchronized blocks.
890 //%note synchronization_3
891
892 //%note monitor_1
893 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
894 #ifdef ASSERT
895 current->last_frame().interpreter_frame_verify_monitor(elem);
896 #endif
897 Handle h_obj(current, elem->obj());
898 assert(Universe::heap()->is_in_or_null(h_obj()),
899 "must be null or an object");
900 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
901 assert(Universe::heap()->is_in_or_null(elem->obj()),
902 "must be null or an object");
903 #ifdef ASSERT
904 current->last_frame().interpreter_frame_verify_monitor(elem);
905 #endif
906 JRT_END
907
908 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
909 oop obj = elem->obj();
910 assert(Universe::heap()->is_in(obj), "must be an object");
911 // The object could become unlocked through a JNI call, which we have no other checks for.
912 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
913 if (obj->is_unlocked()) {
914 if (CheckJNICalls) {
915 fatal("Object has been unlocked by JNI");
916 }
917 return;
918 }
919 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
920 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
921 // again at method exit or in the case of an exception.
922 elem->set_obj(nullptr);
923 JRT_END
924
925 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
926 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
927 JRT_END
928
929 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
930 // Returns an illegal exception to install into the current thread. The
931 // pending_exception flag is cleared so normal exception handling does not
932 // trigger. Any current installed exception will be overwritten. This
933 // method will be called during an exception unwind.
934
935 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
936 Handle exception(current, current->vm_result());
937 assert(exception() != nullptr, "vm result should be set");
938 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
939 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
940 current->set_vm_result(exception());
941 JRT_END
942
943 JRT_ENTRY(void, InterpreterRuntime::throw_identity_exception(JavaThread* current, oopDesc* obj))
944 Klass* klass = cast_to_oop(obj)->klass();
945 ResourceMark rm(THREAD);
946 const char* desc = "Cannot synchronize on an instance of value class ";
947 const char* className = klass->external_name();
948 size_t msglen = strlen(desc) + strlen(className) + 1;
949 char* message = NEW_RESOURCE_ARRAY(char, msglen);
950 if (nullptr == message) {
951 // Out of memory: can't create detailed error message
952 THROW_MSG(vmSymbols::java_lang_IdentityException(), className);
953 } else {
954 jio_snprintf(message, msglen, "%s%s", desc, className);
955 THROW_MSG(vmSymbols::java_lang_IdentityException(), message);
956 }
957 JRT_END
958
959 //------------------------------------------------------------------------------------------------------------------------
960 // Invokes
961
962 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
963 return method->orig_bytecode_at(method->bci_from(bcp));
964 JRT_END
965
966 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
967 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
968 JRT_END
969
970 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
971 JvmtiExport::post_raw_breakpoint(current, method, bcp);
972 JRT_END
973
974 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
975 LastFrameAccessor last_frame(current);
976 // extract receiver from the outgoing argument list if necessary
977 Handle receiver(current, nullptr);
978 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
979 bytecode == Bytecodes::_invokespecial) {
980 ResourceMark rm(current);
981 methodHandle m (current, last_frame.method());
982 Bytecode_invoke call(m, last_frame.bci());
983 Symbol* signature = call.signature();
984 receiver = Handle(current, last_frame.callee_receiver(signature));
985
986 assert(Universe::heap()->is_in_or_null(receiver()),
987 "sanity check");
988 assert(receiver.is_null() ||
989 !Universe::heap()->is_in(receiver->klass()),
990 "sanity check");
991 }
992
993 // resolve method
994 CallInfo info;
995 constantPoolHandle pool(current, last_frame.method()->constants());
996
997 methodHandle resolved_method;
998
999 int method_index = last_frame.get_index_u2(bytecode);
1000 {
1001 JvmtiHideSingleStepping jhss(current);
1002 JavaThread* THREAD = current; // For exception macros.
1003 LinkResolver::resolve_invoke(info, receiver, pool,
1004 method_index, bytecode,
1005 THREAD);
1006
1007 if (HAS_PENDING_EXCEPTION) {
1008 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
1009 // Preserve the original exception across the call to note_trap()
1010 PreserveExceptionMark pm(current);
1011 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
1012 note_trap(current, Deoptimization::Reason_null_check);
1013 }
1014 return;
1015 }
1016
1017 resolved_method = methodHandle(current, info.resolved_method());
1018 } // end JvmtiHideSingleStepping
1019
1020 update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
1021 }
1022
1023 void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
1024 methodHandle& resolved_method,
1025 constantPoolHandle& pool,
1026 int method_index) {
1027 // Don't allow safepoints until the method is cached.
1028 NoSafepointVerifier nsv;
1029
1030 // check if link resolution caused cpCache to be updated
1031 ConstantPoolCache* cache = pool->cache();
1032 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
1033
1034 #ifdef ASSERT
1035 if (bytecode == Bytecodes::_invokeinterface) {
1036 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
1037 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
1038 // (see also CallInfo::set_interface for details)
1039 assert(info.call_kind() == CallInfo::vtable_call ||
1040 info.call_kind() == CallInfo::direct_call, "");
1041 assert(resolved_method->is_final() || info.has_vtable_index(),
1042 "should have been set already");
1043 } else if (!resolved_method->has_itable_index()) {
1044 // Resolved something like CharSequence.toString. Use vtable not itable.
1045 assert(info.call_kind() != CallInfo::itable_call, "");
1046 } else {
1047 // Setup itable entry
1048 assert(info.call_kind() == CallInfo::itable_call, "");
1049 int index = resolved_method->itable_index();
1050 assert(info.itable_index() == index, "");
1051 }
1052 } else if (bytecode == Bytecodes::_invokespecial) {
1053 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
1054 } else {
1055 assert(info.call_kind() == CallInfo::direct_call ||
1056 info.call_kind() == CallInfo::vtable_call, "");
1057 }
1058 #endif
1059 // Get sender and only set cpCache entry to resolved if it is not an
1060 // interface. The receiver for invokespecial calls within interface
1061 // methods must be checked for every call.
1062 InstanceKlass* sender = pool->pool_holder();
1063
1064 switch (info.call_kind()) {
1065 case CallInfo::direct_call:
1066 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
1067 break;
1068 case CallInfo::vtable_call:
1069 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
1070 break;
1071 case CallInfo::itable_call:
1072 cache->set_itable_call(
1073 bytecode,
1074 method_index,
1075 info.resolved_klass(),
1076 resolved_method,
1077 info.itable_index());
1078 break;
1079 default: ShouldNotReachHere();
1080 }
1081 }
1082
1083 void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
1084 constantPoolHandle& pool, TRAPS) {
1085 LinkInfo link_info(pool, method_index, bytecode, CHECK);
1086
1087 if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
1088 CallInfo call_info;
1089 switch (bytecode) {
1090 case Bytecodes::_invokevirtual: LinkResolver::cds_resolve_virtual_call (call_info, link_info, CHECK); break;
1091 case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
1092 case Bytecodes::_invokespecial: LinkResolver::cds_resolve_special_call (call_info, link_info, CHECK); break;
1093
1094 default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
1095 }
1096 methodHandle resolved_method(THREAD, call_info.resolved_method());
1097 guarantee(resolved_method->method_holder()->is_linked(), "");
1098 update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
1099 } else {
1100 // FIXME: why a shared class is not linked yet?
1101 // Can't link it here since there are no guarantees it'll be prelinked on the next run.
1102 ResourceMark rm;
1103 InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
1104 log_info(cds, resolve)("Not resolved: class not linked: %s %s %s",
1105 resolved_iklass->is_shared() ? "is_shared" : "",
1106 resolved_iklass->init_state_name(),
1107 resolved_iklass->external_name());
1108 }
1109 }
1110
1111 // First time execution: Resolve symbols, create a permanent MethodType object.
1112 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
1113 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
1114 LastFrameAccessor last_frame(current);
1115
1116 // resolve method
1117 CallInfo info;
1118 constantPoolHandle pool(current, last_frame.method()->constants());
1119 int method_index = last_frame.get_index_u2(bytecode);
1120 {
1121 JvmtiHideSingleStepping jhss(current);
1122 JavaThread* THREAD = current; // For exception macros.
1123 LinkResolver::resolve_invoke(info, Handle(), pool,
1124 method_index, bytecode,
1125 CHECK);
1126 } // end JvmtiHideSingleStepping
1127
1128 pool->cache()->set_method_handle(method_index, info);
1129 }
1130
1131 // First time execution: Resolve symbols, create a permanent CallSite object.
1132 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
1133 LastFrameAccessor last_frame(current);
1134 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
1135
1136 // resolve method
1137 CallInfo info;
1138 constantPoolHandle pool(current, last_frame.method()->constants());
1139 int index = last_frame.get_index_u4(bytecode);
1140 {
1141 JvmtiHideSingleStepping jhss(current);
1142 JavaThread* THREAD = current; // For exception macros.
1143 LinkResolver::resolve_invoke(info, Handle(), pool,
1144 index, bytecode, CHECK);
1145 } // end JvmtiHideSingleStepping
1146
1147 pool->cache()->set_dynamic_call(info, index);
1148 }
1149
1150 // This function is the interface to the assembly code. It returns the resolved
1151 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
1152 // This function will check for redefinition!
1153 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
1154 switch (bytecode) {
1155 case Bytecodes::_getstatic:
1156 case Bytecodes::_putstatic:
1157 case Bytecodes::_getfield:
1158 case Bytecodes::_putfield:
1159 resolve_get_put(current, bytecode);
1160 break;
1161 case Bytecodes::_invokevirtual:
1162 case Bytecodes::_invokespecial:
1163 case Bytecodes::_invokestatic:
1164 case Bytecodes::_invokeinterface:
1165 resolve_invoke(current, bytecode);
1166 break;
1167 case Bytecodes::_invokehandle:
1168 resolve_invokehandle(current);
1169 break;
1170 case Bytecodes::_invokedynamic:
1171 resolve_invokedynamic(current);
1172 break;
1173 default:
1174 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1175 break;
1176 }
1177 }
1178 JRT_END
1179
1180 //------------------------------------------------------------------------------------------------------------------------
1181 // Miscellaneous
1182
1183
1184 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1185 // Enable WXWrite: the function is called directly by interpreter.
1186 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1187
1188 // frequency_counter_overflow_inner can throw async exception.
1189 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1190 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1191 if (branch_bcp != nullptr && nm != nullptr) {
1192 // This was a successful request for an OSR nmethod. Because
1193 // frequency_counter_overflow_inner ends with a safepoint check,
1194 // nm could have been unloaded so look it up again. It's unsafe
1195 // to examine nm directly since it might have been freed and used
1196 // for something else.
1197 LastFrameAccessor last_frame(current);
1198 Method* method = last_frame.method();
1199 int bci = method->bci_from(last_frame.bcp());
1200 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1201 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1202 if (nm != nullptr && bs_nm != nullptr) {
1203 // in case the transition passed a safepoint we need to barrier this again
1204 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1205 nm = nullptr;
1206 }
1207 }
1208 }
1209 if (nm != nullptr && current->is_interp_only_mode()) {
1210 // Normally we never get an nm if is_interp_only_mode() is true, because
1211 // policy()->event has a check for this and won't compile the method when
1212 // true. However, it's possible for is_interp_only_mode() to become true
1213 // during the compilation. We don't want to return the nm in that case
1214 // because we want to continue to execute interpreted.
1215 nm = nullptr;
1216 }
1217 #ifndef PRODUCT
1218 if (TraceOnStackReplacement) {
1219 if (nm != nullptr) {
1220 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1221 nm->print();
1222 }
1223 }
1224 #endif
1225 return nm;
1226 }
1227
1228 JRT_ENTRY(nmethod*,
1229 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1230 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1231 // flag, in case this method triggers classloading which will call into Java.
1232 UnlockFlagSaver fs(current);
1233
1234 LastFrameAccessor last_frame(current);
1235 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1236 methodHandle method(current, last_frame.method());
1237 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1238 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1239
1240 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1241
1242 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1243 if (osr_nm != nullptr && bs_nm != nullptr) {
1244 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1245 osr_nm = nullptr;
1246 }
1247 }
1248 return osr_nm;
1249 JRT_END
1250
1251 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1252 assert(ProfileInterpreter, "must be profiling interpreter");
1253 int bci = method->bci_from(cur_bcp);
1254 MethodData* mdo = method->method_data();
1255 if (mdo == nullptr) return 0;
1256 return mdo->bci_to_di(bci);
1257 JRT_END
1258
1259 #ifdef ASSERT
1260 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1261 assert(ProfileInterpreter, "must be profiling interpreter");
1262
1263 MethodData* mdo = method->method_data();
1264 assert(mdo != nullptr, "must not be null");
1265
1266 int bci = method->bci_from(bcp);
1267
1268 address mdp2 = mdo->bci_to_dp(bci);
1269 if (mdp != mdp2) {
1270 ResourceMark rm;
1271 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1272 int current_di = mdo->dp_to_di(mdp);
1273 int expected_di = mdo->dp_to_di(mdp2);
1274 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1275 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1276 int approx_bci = -1;
1277 if (current_di >= 0) {
1278 approx_bci = mdo->data_at(current_di)->bci();
1279 }
1280 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1281 mdo->print_on(tty);
1282 method->print_codes();
1283 }
1284 assert(mdp == mdp2, "wrong mdp");
1285 JRT_END
1286 #endif // ASSERT
1287
1288 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1289 assert(ProfileInterpreter, "must be profiling interpreter");
1290 ResourceMark rm(current);
1291 LastFrameAccessor last_frame(current);
1292 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1293 MethodData* h_mdo = last_frame.method()->method_data();
1294
1295 // Grab a lock to ensure atomic access to setting the return bci and
1296 // the displacement. This can block and GC, invalidating all naked oops.
1297 MutexLocker ml(RetData_lock);
1298
1299 // ProfileData is essentially a wrapper around a derived oop, so we
1300 // need to take the lock before making any ProfileData structures.
1301 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1302 guarantee(data != nullptr, "profile data must be valid");
1303 RetData* rdata = data->as_RetData();
1304 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1305 last_frame.set_mdp(new_mdp);
1306 JRT_END
1307
1308 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1309 return Method::build_method_counters(current, m);
1310 JRT_END
1311
1312
1313 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1314 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1315 // stack traversal automatically takes care of preserving arguments for invoke, so
1316 // this is no longer needed.
1317
1318 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1319 // if this is called during a safepoint
1320
1321 if (JvmtiExport::should_post_single_step()) {
1322 // This function is called by the interpreter when single stepping. Such single
1323 // stepping could unwind a frame. Then, it is important that we process any frames
1324 // that we might return into.
1325 StackWatermarkSet::before_unwind(current);
1326
1327 // We are called during regular safepoints and when the VM is
1328 // single stepping. If any thread is marked for single stepping,
1329 // then we may have JVMTI work to do.
1330 LastFrameAccessor last_frame(current);
1331 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1332 }
1333 JRT_END
1334
1335 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1336 assert(current == JavaThread::current(), "pre-condition");
1337 // This function is called by the interpreter when the return poll found a reason
1338 // to call the VM. The reason could be that we are returning into a not yet safe
1339 // to access frame. We handle that below.
1340 // Note that this path does not check for single stepping, because we do not want
1341 // to single step when unwinding frames for an exception being thrown. Instead,
1342 // such single stepping code will use the safepoint table, which will use the
1343 // InterpreterRuntime::at_safepoint callback.
1344 StackWatermarkSet::before_unwind(current);
1345 JRT_END
1346
1347 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1348 ResolvedFieldEntry *entry))
1349
1350 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
1351 // check the access_flags for the field in the klass
1352
1353 InstanceKlass* ik = entry->field_holder();
1354 int index = entry->field_index();
1355 if (!ik->field_status(index).is_access_watched()) return;
1356
1357 bool is_static = (obj == nullptr);
1358 bool is_flat = entry->is_flat();
1359 HandleMark hm(current);
1360
1361 Handle h_obj;
1362 if (!is_static) {
1363 // non-static field accessors have an object, but we need a handle
1364 h_obj = Handle(current, obj);
1365 }
1366 InstanceKlass* field_holder = entry->field_holder(); // HERE
1367 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static, is_flat);
1368 LastFrameAccessor last_frame(current);
1369 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1370 JRT_END
1371
1372 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1373 ResolvedFieldEntry *entry, jvalue *value))
1374
1375 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
1376 InstanceKlass* ik = entry->field_holder();
1377
1378 // check the access_flags for the field in the klass
1379 int index = entry->field_index();
1380 // bail out if field modifications are not watched
1381 if (!ik->field_status(index).is_modification_watched()) return;
1382
1383 char sig_type = '\0';
1384
1385 switch((TosState)entry->tos_state()) {
1386 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1387 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1388 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1389 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1390 case itos: sig_type = JVM_SIGNATURE_INT; break;
1391 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1392 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1393 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1394 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1395 default: ShouldNotReachHere(); return;
1396 }
1397
1398 bool is_static = (obj == nullptr);
1399 bool is_flat = entry->is_flat();
1400
1401 HandleMark hm(current);
1402 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static, is_flat);
1403 jvalue fvalue;
1404 #ifdef _LP64
1405 fvalue = *value;
1406 #else
1407 // Long/double values are stored unaligned and also noncontiguously with
1408 // tagged stacks. We can't just do a simple assignment even in the non-
1409 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1410 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1411 // We assume that the two halves of longs/doubles are stored in interpreter
1412 // stack slots in platform-endian order.
1413 jlong_accessor u;
1414 jint* newval = (jint*)value;
1415 u.words[0] = newval[0];
1416 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1417 fvalue.j = u.long_value;
1418 #endif // _LP64
1419
1420 Handle h_obj;
1421 if (!is_static) {
1422 // non-static field accessors have an object, but we need a handle
1423 h_obj = Handle(current, obj);
1424 }
1425
1426 LastFrameAccessor last_frame(current);
1427 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1428 fid, sig_type, &fvalue);
1429 JRT_END
1430
1431 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1432 LastFrameAccessor last_frame(current);
1433 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1434 JRT_END
1435
1436
1437 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1438 // before transitioning to VM, and restore it after transitioning back
1439 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1440 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1441 LastFrameAccessor last_frame(current);
1442 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1443 JRT_END
1444
1445 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1446 {
1447 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1448 }
1449 JRT_END
1450
1451
1452 // Implementation of SignatureHandlerLibrary
1453
1454 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1455 // Dummy definition (else normalization method is defined in CPU
1456 // dependent code)
1457 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1458 return fingerprint;
1459 }
1460 #endif
1461
1462 address SignatureHandlerLibrary::set_handler_blob() {
1463 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1464 if (handler_blob == nullptr) {
1465 return nullptr;
1466 }
1467 address handler = handler_blob->code_begin();
1468 _handler_blob = handler_blob;
1469 _handler = handler;
1470 return handler;
1471 }
1472
1473 void SignatureHandlerLibrary::initialize() {
1474 if (_fingerprints != nullptr) {
1475 return;
1476 }
1477 if (set_handler_blob() == nullptr) {
1478 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1479 }
1480
1481 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1482 SignatureHandlerLibrary::buffer_size);
1483 _buffer = bb->code_begin();
1484
1485 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1486 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1487 }
1488
1489 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1490 address handler = _handler;
1491 int insts_size = buffer->pure_insts_size();
1492 if (handler + insts_size > _handler_blob->code_end()) {
1493 // get a new handler blob
1494 handler = set_handler_blob();
1495 }
1496 if (handler != nullptr) {
1497 memcpy(handler, buffer->insts_begin(), insts_size);
1498 pd_set_handler(handler);
1499 ICache::invalidate_range(handler, insts_size);
1500 _handler = handler + insts_size;
1501 }
1502 return handler;
1503 }
1504
1505 void SignatureHandlerLibrary::add(const methodHandle& method) {
1506 if (method->signature_handler() == nullptr) {
1507 // use slow signature handler if we can't do better
1508 int handler_index = -1;
1509 // check if we can use customized (fast) signature handler
1510 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1511 // use customized signature handler
1512 MutexLocker mu(SignatureHandlerLibrary_lock);
1513 // make sure data structure is initialized
1514 initialize();
1515 // lookup method signature's fingerprint
1516 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1517 // allow CPU dependent code to optimize the fingerprints for the fast handler
1518 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1519 handler_index = _fingerprints->find(fingerprint);
1520 // create handler if necessary
1521 if (handler_index < 0) {
1522 ResourceMark rm;
1523 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1524 CodeBuffer buffer((address)(_buffer + align_offset),
1525 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1526 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1527 // copy into code heap
1528 address handler = set_handler(&buffer);
1529 if (handler == nullptr) {
1530 // use slow signature handler (without memorizing it in the fingerprints)
1531 } else {
1532 // debugging support
1533 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1534 ttyLocker ttyl;
1535 tty->cr();
1536 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1537 _handlers->length(),
1538 (method->is_static() ? "static" : "receiver"),
1539 method->name_and_sig_as_C_string(),
1540 fingerprint,
1541 buffer.insts_size());
1542 if (buffer.insts_size() > 0) {
1543 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1544 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1545 }
1546 #ifndef PRODUCT
1547 address rh_begin = Interpreter::result_handler(method()->result_type());
1548 if (CodeCache::contains(rh_begin)) {
1549 // else it might be special platform dependent values
1550 tty->print_cr(" --- associated result handler ---");
1551 address rh_end = rh_begin;
1552 while (*(int*)rh_end != 0) {
1553 rh_end += sizeof(int);
1554 }
1555 Disassembler::decode(rh_begin, rh_end);
1556 } else {
1557 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1558 }
1559 #endif
1560 }
1561 // add handler to library
1562 _fingerprints->append(fingerprint);
1563 _handlers->append(handler);
1564 // set handler index
1565 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1566 handler_index = _fingerprints->length() - 1;
1567 }
1568 }
1569 // Set handler under SignatureHandlerLibrary_lock
1570 if (handler_index < 0) {
1571 // use generic signature handler
1572 method->set_signature_handler(Interpreter::slow_signature_handler());
1573 } else {
1574 // set handler
1575 method->set_signature_handler(_handlers->at(handler_index));
1576 }
1577 } else {
1578 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1579 // use generic signature handler
1580 method->set_signature_handler(Interpreter::slow_signature_handler());
1581 }
1582 }
1583 #ifdef ASSERT
1584 int handler_index = -1;
1585 int fingerprint_index = -2;
1586 {
1587 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1588 // in any way if accessed from multiple threads. To avoid races with another
1589 // thread which may change the arrays in the above, mutex protected block, we
1590 // have to protect this read access here with the same mutex as well!
1591 MutexLocker mu(SignatureHandlerLibrary_lock);
1592 if (_handlers != nullptr) {
1593 handler_index = _handlers->find(method->signature_handler());
1594 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1595 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1596 fingerprint_index = _fingerprints->find(fingerprint);
1597 }
1598 }
1599 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1600 handler_index == fingerprint_index, "sanity check");
1601 #endif // ASSERT
1602 }
1603
1604 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1605 int handler_index = -1;
1606 // use customized signature handler
1607 MutexLocker mu(SignatureHandlerLibrary_lock);
1608 // make sure data structure is initialized
1609 initialize();
1610 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1611 handler_index = _fingerprints->find(fingerprint);
1612 // create handler if necessary
1613 if (handler_index < 0) {
1614 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1615 tty->cr();
1616 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1617 _handlers->length(),
1618 p2i(handler),
1619 fingerprint);
1620 }
1621 _fingerprints->append(fingerprint);
1622 _handlers->append(handler);
1623 } else {
1624 if (PrintSignatureHandlers) {
1625 tty->cr();
1626 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1627 _handlers->length(),
1628 fingerprint,
1629 p2i(_handlers->at(handler_index)),
1630 p2i(handler));
1631 }
1632 }
1633 }
1634
1635
1636 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1637 address SignatureHandlerLibrary::_handler = nullptr;
1638 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1639 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1640 address SignatureHandlerLibrary::_buffer = nullptr;
1641
1642
1643 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1644 methodHandle m(current, method);
1645 assert(m->is_native(), "sanity check");
1646 // lookup native function entry point if it doesn't exist
1647 if (!m->has_native_function()) {
1648 NativeLookup::lookup(m, CHECK);
1649 }
1650 // make sure signature handler is installed
1651 SignatureHandlerLibrary::add(m);
1652 // The interpreter entry point checks the signature handler first,
1653 // before trying to fetch the native entry point and klass mirror.
1654 // We must set the signature handler last, so that multiple processors
1655 // preparing the same method will be sure to see non-null entry & mirror.
1656 JRT_END
1657
1658 #if defined(IA32) || defined(AMD64) || defined(ARM)
1659 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1660 assert(current == JavaThread::current(), "pre-condition");
1661 if (src_address == dest_address) {
1662 return;
1663 }
1664 ResourceMark rm;
1665 LastFrameAccessor last_frame(current);
1666 assert(last_frame.is_interpreted_frame(), "");
1667 jint bci = last_frame.bci();
1668 methodHandle mh(current, last_frame.method());
1669 Bytecode_invoke invoke(mh, bci);
1670 ArgumentSizeComputer asc(invoke.signature());
1671 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1672 Copy::conjoint_jbytes(src_address, dest_address,
1673 size_of_arguments * Interpreter::stackElementSize);
1674 JRT_END
1675 #endif
1676
1677 #if INCLUDE_JVMTI
1678 // This is a support of the JVMTI PopFrame interface.
1679 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1680 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1681 // The member_name argument is a saved reference (in local#0) to the member_name.
1682 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1683 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1684 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1685 Method* method, address bcp))
1686 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1687 if (code != Bytecodes::_invokestatic) {
1688 return;
1689 }
1690 ConstantPool* cpool = method->constants();
1691 int cp_index = Bytes::get_native_u2(bcp + 1);
1692 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1693 Symbol* mname = cpool->name_ref_at(cp_index, code);
1694
1695 if (MethodHandles::has_member_arg(cname, mname)) {
1696 oop member_name_oop = cast_to_oop(member_name);
1697 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1698 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1699 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1700 }
1701 current->set_vm_result(member_name_oop);
1702 } else {
1703 current->set_vm_result(nullptr);
1704 }
1705 JRT_END
1706 #endif // INCLUDE_JVMTI
1707
1708 #ifndef PRODUCT
1709 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1710 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1711 // The generated code still uses call_VM because that will set up the frame pointer for
1712 // bcp and method.
1713 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1714 assert(current == JavaThread::current(), "pre-condition");
1715 LastFrameAccessor last_frame(current);
1716 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1717 methodHandle mh(current, last_frame.method());
1718 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1719 return preserve_this_value;
1720 JRT_END
1721 #endif // !PRODUCT