1 /*
2 * Copyright (c) 1997, 2024, 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 klass->set_inline_type_field_klass(index, InlineKlass::cast(field_k));
263 }
264 field_k->initialize(CHECK);
265 oop defaultvalue = InlineKlass::cast(field_k)->default_value();
266 // It is safe to initialize the static field because 1) the current thread is the initializing thread
267 // and is the only one that can access it, and 2) the field is actually not initialized (i.e. null)
268 // otherwise the JVM should not be executing this code.
269 mirror_h()->obj_field_put(offset, defaultvalue);
270 current->set_vm_result(defaultvalue);
271 } else {
272 assert(klass->is_in_error_state(), "If not initializing, initialization must have failed to get there");
273 ResourceMark rm(THREAD);
274 const char* desc = "Could not initialize class ";
275 const char* className = klass->external_name();
276 size_t msglen = strlen(desc) + strlen(className) + 1;
277 char* message = NEW_RESOURCE_ARRAY(char, msglen);
278 if (nullptr == message) {
279 // Out of memory: can't create detailed error message
280 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
281 } else {
282 jio_snprintf(message, msglen, "%s%s", desc, className);
283 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
284 }
285 }
286 JRT_END
287
288 JRT_ENTRY(void, InterpreterRuntime::read_flat_field(JavaThread* current, oopDesc* obj, int index, Klass* field_holder))
289 Handle obj_h(THREAD, obj);
290
291 assert(oopDesc::is_oop(obj), "Sanity check");
292
293 assert(field_holder->is_instance_klass(), "Sanity check");
294 InstanceKlass* klass = InstanceKlass::cast(field_holder);
295
296 assert(klass->field_is_flat(index), "Sanity check");
297
298 InlineKlass* field_vklass = InlineKlass::cast(klass->get_inline_type_field_klass(index));
299
300 oop res = field_vklass->read_flat_field(obj_h(), klass->field_offset(index), CHECK);
301 current->set_vm_result(res);
302 JRT_END
303
304 // The protocol to read a nullable flat field is:
305 // Step 1: read the null marker with an load_acquire barrier to ensure that
306 // reordered loads won't try to load the value before the null marker is read
307 // Step 2: if the null marker value is zero, the field's value is null
308 // otherwise the flat field value can be read like a regular flat field
309 JRT_ENTRY(void, InterpreterRuntime::read_nullable_flat_field(JavaThread* current, oopDesc* obj, ResolvedFieldEntry* entry))
310 assert(oopDesc::is_oop(obj), "Sanity check");
311 assert(entry->has_null_marker(), "Otherwise should not get there");
312 Handle obj_h(THREAD, obj);
313
314 InstanceKlass* ik = InstanceKlass::cast(obj_h()->klass());
315 int field_index = entry->field_index();
316 int nm_offset = ik->null_marker_offsets_array()->at(field_index);
317 if (obj_h()->byte_field_acquire(nm_offset) == 0) {
318 current->set_vm_result(nullptr);
319 } else {
320 InlineKlass* field_vklass = InlineKlass::cast(ik->get_inline_type_field_klass(field_index));
321 oop res = field_vklass->read_flat_field(obj_h(), ik->field_offset(field_index), CHECK);
322 current->set_vm_result(res);
323 }
324 JRT_END
325
326 // The protocol to write a nullable flat field is:
327 // If the new field value is null, just write zero to the null marker
328 // Otherwise:
329 // Step 1: write the field value like a regular flat field
330 // Step 2: have a memory barrier to ensure that the whole value content is visible
331 // Step 3: update the null marker to a non zero value
332 JRT_ENTRY(void, InterpreterRuntime::write_nullable_flat_field(JavaThread* current, oopDesc* obj, oopDesc* value, ResolvedFieldEntry* entry))
333 assert(oopDesc::is_oop(obj), "Sanity check");
334 Handle obj_h(THREAD, obj);
335 assert(value == nullptr || oopDesc::is_oop(value), "Sanity check");
336 Handle val_h(THREAD, value);
337
338 InstanceKlass* ik = InstanceKlass::cast(obj_h()->klass());
339 int nm_offset = ik->null_marker_offsets_array()->at(entry->field_index());
340 if (val_h() == nullptr) {
341 obj_h()->byte_field_put(nm_offset, (jbyte)0);
342 return;
343 }
344 InlineKlass* vk = InlineKlass::cast(val_h()->klass());
345 if (entry->has_internal_null_marker()) {
346 // The interpreter copies values with a bulk operation
347 // To avoid accidently setting the null marker to "null" during
348 // the copying, the null marker is set to non zero in the source object
349 if (val_h()->byte_field(vk->get_internal_null_marker_offset()) == 0) {
350 val_h()->byte_field_put(vk->get_internal_null_marker_offset(), (jbyte)1);
351 }
352 vk->write_non_null_flat_field(obj_h(), entry->field_offset(), val_h());
353 } else {
354 vk->write_non_null_flat_field(obj_h(), entry->field_offset(), val_h());
355 OrderAccess::release();
356 obj_h()->byte_field_put(nm_offset, (jbyte)1);
357 }
358 JRT_END
359
360 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
361 oop obj = oopFactory::new_typeArray(type, size, CHECK);
362 current->set_vm_result(obj);
363 JRT_END
364
365
366 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
367 Klass* klass = pool->klass_at(index, CHECK);
368 arrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
369 current->set_vm_result(obj);
370 JRT_END
371
372 JRT_ENTRY(void, InterpreterRuntime::value_array_load(JavaThread* current, arrayOopDesc* array, int index))
373 flatArrayHandle vah(current, (flatArrayOop)array);
374 oop value_holder = flatArrayOopDesc::value_alloc_copy_from_index(vah, index, CHECK);
375 current->set_vm_result(value_holder);
376 JRT_END
377
378 JRT_ENTRY(void, InterpreterRuntime::value_array_store(JavaThread* current, void* val, arrayOopDesc* array, int index))
379 assert(val != nullptr, "can't store null into flat array");
380 ((flatArrayOop)array)->value_copy_to_index(cast_to_oop(val), index);
381 JRT_END
382
383 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
384 // We may want to pass in more arguments - could make this slightly faster
385 LastFrameAccessor last_frame(current);
386 ConstantPool* constants = last_frame.method()->constants();
387 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
388 Klass* klass = constants->klass_at(i, CHECK);
389 int nof_dims = last_frame.number_of_dimensions();
390 assert(klass->is_klass(), "not a class");
391 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
392
393 // We must create an array of jints to pass to multi_allocate.
394 ResourceMark rm(current);
395 const int small_dims = 10;
396 jint dim_array[small_dims];
397 jint *dims = &dim_array[0];
398 if (nof_dims > small_dims) {
399 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
400 }
401 for (int index = 0; index < nof_dims; index++) {
402 // offset from first_size_address is addressed as local[index]
403 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
404 dims[index] = first_size_address[n];
405 }
406 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
407 current->set_vm_result(obj);
408 JRT_END
409
410
411 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
412 assert(oopDesc::is_oop(obj), "must be a valid oop");
413 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
414 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
415 JRT_END
416
417 JRT_ENTRY(jboolean, InterpreterRuntime::is_substitutable(JavaThread* current, oopDesc* aobj, oopDesc* bobj))
418 assert(oopDesc::is_oop(aobj) && oopDesc::is_oop(bobj), "must be valid oops");
419
420 Handle ha(THREAD, aobj);
421 Handle hb(THREAD, bobj);
422 JavaValue result(T_BOOLEAN);
423 JavaCallArguments args;
424 args.push_oop(ha);
425 args.push_oop(hb);
426 methodHandle method(current, Universe::is_substitutable_method());
427 method->method_holder()->initialize(CHECK_false); // Ensure class ValueObjectMethods is initialized
428 JavaCalls::call(&result, method, &args, THREAD);
429 if (HAS_PENDING_EXCEPTION) {
430 // Something really bad happened because isSubstitutable() should not throw exceptions
431 // If it is an error, just let it propagate
432 // If it is an exception, wrap it into an InternalError
433 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
434 Handle e(THREAD, PENDING_EXCEPTION);
435 CLEAR_PENDING_EXCEPTION;
436 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in substitutability test", e, false);
437 }
438 }
439 return result.get_jboolean();
440 JRT_END
441
442 // Quicken instance-of and check-cast bytecodes
443 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
444 // Force resolving; quicken the bytecode
445 LastFrameAccessor last_frame(current);
446 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
447 ConstantPool* cpool = last_frame.method()->constants();
448 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
449 // program we might have seen an unquick'd bytecode in the interpreter but have another
450 // thread quicken the bytecode before we get here.
451 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
452 Klass* klass = cpool->klass_at(which, CHECK);
453 current->set_vm_result_2(klass);
454 JRT_END
455
456
457 //------------------------------------------------------------------------------------------------------------------------
458 // Exceptions
459
460 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
461 const methodHandle& trap_method, int trap_bci) {
462 if (trap_method.not_null()) {
463 MethodData* trap_mdo = trap_method->method_data();
464 if (trap_mdo == nullptr) {
465 ExceptionMark em(current);
466 JavaThread* THREAD = current; // For exception macros.
467 Method::build_profiling_method_data(trap_method, THREAD);
468 if (HAS_PENDING_EXCEPTION) {
469 // Only metaspace OOM is expected. No Java code executed.
470 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
471 "we expect only an OOM error here");
472 CLEAR_PENDING_EXCEPTION;
473 }
474 trap_mdo = trap_method->method_data();
475 // and fall through...
476 }
477 if (trap_mdo != nullptr) {
478 // Update per-method count of trap events. The interpreter
479 // is updating the MDO to simulate the effect of compiler traps.
480 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
481 }
482 }
483 }
484
485 // Assume the compiler is (or will be) interested in this event.
486 // If necessary, create an MDO to hold the information, and record it.
487 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
488 assert(ProfileTraps, "call me only if profiling");
489 LastFrameAccessor last_frame(current);
490 methodHandle trap_method(current, last_frame.method());
491 int trap_bci = trap_method->bci_from(last_frame.bcp());
492 note_trap_inner(current, reason, trap_method, trap_bci);
493 }
494
495 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
496 // get klass
497 InstanceKlass* klass = InstanceKlass::cast(k);
498 assert(klass->is_initialized(),
499 "this klass should have been initialized during VM initialization");
500 // create instance - do not call constructor since we may have no
501 // (java) stack space left (should assert constructor is empty)
502 Handle exception;
503 oop exception_oop = klass->allocate_instance(CHECK_(exception));
504 exception = Handle(THREAD, exception_oop);
505 if (StackTraceInThrowable) {
506 java_lang_Throwable::fill_in_stack_trace(exception);
507 }
508 return exception;
509 }
510
511 // Special handling for stack overflow: since we don't have any (java) stack
512 // space left we use the pre-allocated & pre-initialized StackOverflowError
513 // klass to create an stack overflow error instance. We do not call its
514 // constructor for the same reason (it is empty, anyway).
515 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
516 Handle exception = get_preinitialized_exception(
517 vmClasses::StackOverflowError_klass(),
518 CHECK);
519 // Increment counter for hs_err file reporting
520 Atomic::inc(&Exceptions::_stack_overflow_errors);
521 // Remove the ScopedValue bindings in case we got a StackOverflowError
522 // while we were trying to manipulate ScopedValue bindings.
523 current->clear_scopedValueBindings();
524 THROW_HANDLE(exception);
525 JRT_END
526
527 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
528 Handle exception = get_preinitialized_exception(
529 vmClasses::StackOverflowError_klass(),
530 CHECK);
531 java_lang_Throwable::set_message(exception(),
532 Universe::delayed_stack_overflow_error_message());
533 // Increment counter for hs_err file reporting
534 Atomic::inc(&Exceptions::_stack_overflow_errors);
535 // Remove the ScopedValue bindings in case we got a StackOverflowError
536 // while we were trying to manipulate ScopedValue bindings.
537 current->clear_scopedValueBindings();
538 THROW_HANDLE(exception);
539 JRT_END
540
541 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
542 // lookup exception klass
543 TempNewSymbol s = SymbolTable::new_symbol(name);
544 if (ProfileTraps) {
545 if (s == vmSymbols::java_lang_ArithmeticException()) {
546 note_trap(current, Deoptimization::Reason_div0_check);
547 } else if (s == vmSymbols::java_lang_NullPointerException()) {
548 note_trap(current, Deoptimization::Reason_null_check);
549 }
550 }
551 // create exception
552 Handle exception = Exceptions::new_exception(current, s, message);
553 current->set_vm_result(exception());
554 JRT_END
555
556
557 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
558 // Produce the error message first because note_trap can safepoint
559 ResourceMark rm(current);
560 const char* klass_name = obj->klass()->external_name();
561 // lookup exception klass
562 TempNewSymbol s = SymbolTable::new_symbol(name);
563 if (ProfileTraps) {
564 if (s == vmSymbols::java_lang_ArrayStoreException()) {
565 note_trap(current, Deoptimization::Reason_array_check);
566 } else {
567 note_trap(current, Deoptimization::Reason_class_check);
568 }
569 }
570 // create exception, with klass name as detail message
571 Handle exception = Exceptions::new_exception(current, s, klass_name);
572 current->set_vm_result(exception());
573 JRT_END
574
575 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
576 // Produce the error message first because note_trap can safepoint
577 ResourceMark rm(current);
578 stringStream ss;
579 ss.print("Index %d out of bounds for length %d", index, a->length());
580
581 if (ProfileTraps) {
582 note_trap(current, Deoptimization::Reason_range_check);
583 }
584
585 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
586 JRT_END
587
588 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
589 JavaThread* current, oopDesc* obj))
590
591 // Produce the error message first because note_trap can safepoint
592 ResourceMark rm(current);
593 char* message = SharedRuntime::generate_class_cast_message(
594 current, obj->klass());
595
596 if (ProfileTraps) {
597 note_trap(current, Deoptimization::Reason_class_check);
598 }
599
600 // create exception
601 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
602 JRT_END
603
604 // exception_handler_for_exception(...) returns the continuation address,
605 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
606 // The exception oop is returned to make sure it is preserved over GC (it
607 // is only on the stack if the exception was thrown explicitly via athrow).
608 // During this operation, the expression stack contains the values for the
609 // bci where the exception happened. If the exception was propagated back
610 // from a call, the expression stack contains the values for the bci at the
611 // invoke w/o arguments (i.e., as if one were inside the call).
612 // Note that the implementation of this method assumes it's only called when an exception has actually occured
613 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
614 // We get here after we have unwound from a callee throwing an exception
615 // into the interpreter. Any deferred stack processing is notified of
616 // the event via the StackWatermarkSet.
617 StackWatermarkSet::after_unwind(current);
618
619 LastFrameAccessor last_frame(current);
620 Handle h_exception(current, exception);
621 methodHandle h_method (current, last_frame.method());
622 constantPoolHandle h_constants(current, h_method->constants());
623 bool should_repeat;
624 int handler_bci;
625 int current_bci = last_frame.bci();
626
627 if (current->frames_to_pop_failed_realloc() > 0) {
628 // Allocation of scalar replaced object used in this frame
629 // failed. Unconditionally pop the frame.
630 current->dec_frames_to_pop_failed_realloc();
631 current->set_vm_result(h_exception());
632 // If the method is synchronized we already unlocked the monitor
633 // during deoptimization so the interpreter needs to skip it when
634 // the frame is popped.
635 current->set_do_not_unlock_if_synchronized(true);
636 return Interpreter::remove_activation_entry();
637 }
638
639 // Need to do this check first since when _do_not_unlock_if_synchronized
640 // is set, we don't want to trigger any classloading which may make calls
641 // into java, or surprisingly find a matching exception handler for bci 0
642 // since at this moment the method hasn't been "officially" entered yet.
643 if (current->do_not_unlock_if_synchronized()) {
644 ResourceMark rm;
645 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
646 current->set_vm_result(exception);
647 return Interpreter::remove_activation_entry();
648 }
649
650 do {
651 should_repeat = false;
652
653 // assertions
654 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
655 // Check that exception is a subclass of Throwable.
656 assert(h_exception->is_a(vmClasses::Throwable_klass()),
657 "Exception not subclass of Throwable");
658
659 // tracing
660 if (log_is_enabled(Info, exceptions)) {
661 ResourceMark rm(current);
662 stringStream tempst;
663 tempst.print("interpreter method <%s>\n"
664 " at bci %d for thread " INTPTR_FORMAT " (%s)",
665 h_method->print_value_string(), current_bci, p2i(current), current->name());
666 Exceptions::log_exception(h_exception, tempst.as_string());
667 }
668 // Don't go paging in something which won't be used.
669 // else if (extable->length() == 0) {
670 // // disabled for now - interpreter is not using shortcut yet
671 // // (shortcut is not to call runtime if we have no exception handlers)
672 // // warning("performance bug: should not call runtime if method has no exception handlers");
673 // }
674 // for AbortVMOnException flag
675 Exceptions::debug_check_abort(h_exception);
676
677 // exception handler lookup
678 Klass* klass = h_exception->klass();
679 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
680 if (HAS_PENDING_EXCEPTION) {
681 // We threw an exception while trying to find the exception handler.
682 // Transfer the new exception to the exception handle which will
683 // be set into thread local storage, and do another lookup for an
684 // exception handler for this exception, this time starting at the
685 // BCI of the exception handler which caused the exception to be
686 // thrown (bug 4307310).
687 h_exception = Handle(THREAD, PENDING_EXCEPTION);
688 CLEAR_PENDING_EXCEPTION;
689 if (handler_bci >= 0) {
690 current_bci = handler_bci;
691 should_repeat = true;
692 }
693 }
694 } while (should_repeat == true);
695
696 #if INCLUDE_JVMCI
697 if (EnableJVMCI && h_method->method_data() != nullptr) {
698 ResourceMark rm(current);
699 MethodData* mdo = h_method->method_data();
700
701 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
702 MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
703
704 ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
705 if (pdata != nullptr && pdata->is_BitData()) {
706 BitData* bit_data = (BitData*) pdata;
707 bit_data->set_exception_seen();
708 }
709 }
710 #endif
711
712 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
713 // time throw or a stack unwinding throw and accordingly notify the debugger
714 if (JvmtiExport::can_post_on_exceptions()) {
715 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
716 }
717
718 address continuation = nullptr;
719 address handler_pc = nullptr;
720 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
721 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
722 // handler in this method, or (b) after a stack overflow there is not yet
723 // enough stack space available to reprotect the stack.
724 continuation = Interpreter::remove_activation_entry();
725 #if COMPILER2_OR_JVMCI
726 // Count this for compilation purposes
727 h_method->interpreter_throwout_increment(THREAD);
728 #endif
729 } else {
730 // handler in this method => change bci/bcp to handler bci/bcp and continue there
731 handler_pc = h_method->code_base() + handler_bci;
732 h_method->set_exception_handler_entered(handler_bci); // profiling
733 #ifndef ZERO
734 set_bcp_and_mdp(handler_pc, current);
735 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
736 #else
737 continuation = (address)(intptr_t) handler_bci;
738 #endif
739 }
740
741 // notify debugger of an exception catch
742 // (this is good for exceptions caught in native methods as well)
743 if (JvmtiExport::can_post_on_exceptions()) {
744 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
745 }
746
747 current->set_vm_result(h_exception());
748 return continuation;
749 JRT_END
750
751
752 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
753 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
754 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
755 JRT_END
756
757
758 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
759 THROW(vmSymbols::java_lang_AbstractMethodError());
760 JRT_END
761
762 // This method is called from the "abstract_entry" of the interpreter.
763 // At that point, the arguments have already been removed from the stack
764 // and therefore we don't have the receiver object at our fingertips. (Though,
765 // on some platforms the receiver still resides in a register...). Thus,
766 // we have no choice but print an error message not containing the receiver
767 // type.
768 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
769 Method* missingMethod))
770 ResourceMark rm(current);
771 assert(missingMethod != nullptr, "sanity");
772 methodHandle m(current, missingMethod);
773 LinkResolver::throw_abstract_method_error(m, THREAD);
774 JRT_END
775
776 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
777 Klass* recvKlass,
778 Method* missingMethod))
779 ResourceMark rm(current);
780 methodHandle mh = methodHandle(current, missingMethod);
781 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
782 JRT_END
783
784 JRT_ENTRY(void, InterpreterRuntime::throw_InstantiationError(JavaThread* current))
785 THROW(vmSymbols::java_lang_InstantiationError());
786 JRT_END
787
788
789 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
790 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
791 JRT_END
792
793 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
794 Klass* recvKlass,
795 Klass* interfaceKlass))
796 ResourceMark rm(current);
797 char buf[1000];
798 buf[0] = '\0';
799 jio_snprintf(buf, sizeof(buf),
800 "Class %s does not implement the requested interface %s",
801 recvKlass ? recvKlass->external_name() : "nullptr",
802 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
803 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
804 JRT_END
805
806 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
807 THROW(vmSymbols::java_lang_NullPointerException());
808 JRT_END
809
810 //------------------------------------------------------------------------------------------------------------------------
811 // Fields
812 //
813
814 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
815 LastFrameAccessor last_frame(current);
816 constantPoolHandle pool(current, last_frame.method()->constants());
817 methodHandle m(current, last_frame.method());
818
819 resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, true /*initialize_holder*/, current);
820 }
821
822 void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
823 methodHandle& m,
824 constantPoolHandle& pool,
825 bool initialize_holder, TRAPS) {
826 fieldDescriptor info;
827 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
828 bytecode == Bytecodes::_putstatic);
829 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
830
831 {
832 JvmtiHideSingleStepping jhss(THREAD);
833 LinkResolver::resolve_field_access(info, pool, field_index,
834 m, bytecode, initialize_holder, CHECK);
835 } // end JvmtiHideSingleStepping
836
837 // check if link resolution caused cpCache to be updated
838 if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
839
840 // compute auxiliary field attributes
841 TosState state = as_TosState(info.field_type());
842
843 // Resolution of put instructions on final fields is delayed. That is required so that
844 // exceptions are thrown at the correct place (when the instruction is actually invoked).
845 // If we do not resolve an instruction in the current pass, leaving the put_code
846 // set to zero will cause the next put instruction to the same field to reresolve.
847
848 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
849 // to final instance fields with updates originating from a method different than <init>)
850 // is inhibited. A putfield instruction targeting an instance final field must throw
851 // an IllegalAccessError if the instruction is not in an instance
852 // initializer method <init>. If resolution were not inhibited, a putfield
853 // in an initializer method could be resolved in the initializer. Subsequent
854 // putfield instructions to the same field would then use cached information.
855 // As a result, those instructions would not pass through the VM. That is,
856 // checks in resolve_field_access() would not be executed for those instructions
857 // and the required IllegalAccessError would not be thrown.
858 //
859 // Also, we need to delay resolving getstatic and putstatic instructions until the
860 // class is initialized. This is required so that access to the static
861 // field will call the initialization function every time until the class
862 // is completely initialized ala. in 2.17.5 in JVM Specification.
863 InstanceKlass* klass = info.field_holder();
864 bool uninitialized_static = is_static && !klass->is_initialized();
865 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
866 info.has_initialized_final_update();
867 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
868
869 Bytecodes::Code get_code = (Bytecodes::Code)0;
870 Bytecodes::Code put_code = (Bytecodes::Code)0;
871 if (!uninitialized_static) {
872 if (is_static) {
873 get_code = Bytecodes::_getstatic;
874 } else {
875 get_code = Bytecodes::_getfield;
876 }
877 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
878 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
879 }
880 }
881
882 ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
883 entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile(),
884 info.is_flat(), info.is_null_free_inline_type(),
885 info.has_null_marker(), info.has_internal_null_marker());
886
887 entry->fill_in(info.field_holder(), info.offset(),
888 checked_cast<u2>(info.index()), checked_cast<u1>(state),
889 static_cast<u1>(get_code), static_cast<u1>(put_code));
890 }
891
892
893 //------------------------------------------------------------------------------------------------------------------------
894 // Synchronization
895 //
896 // The interpreter's synchronization code is factored out so that it can
897 // be shared by method invocation and synchronized blocks.
898 //%note synchronization_3
899
900 //%note monitor_1
901 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
902 #ifdef ASSERT
903 current->last_frame().interpreter_frame_verify_monitor(elem);
904 #endif
905 Handle h_obj(current, elem->obj());
906 assert(Universe::heap()->is_in_or_null(h_obj()),
907 "must be null or an object");
908 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
909 assert(Universe::heap()->is_in_or_null(elem->obj()),
910 "must be null or an object");
911 #ifdef ASSERT
912 current->last_frame().interpreter_frame_verify_monitor(elem);
913 #endif
914 JRT_END
915
916 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
917 oop obj = elem->obj();
918 assert(Universe::heap()->is_in(obj), "must be an object");
919 // The object could become unlocked through a JNI call, which we have no other checks for.
920 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
921 if (obj->is_unlocked()) {
922 if (CheckJNICalls) {
923 fatal("Object has been unlocked by JNI");
924 }
925 return;
926 }
927 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
928 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
929 // again at method exit or in the case of an exception.
930 elem->set_obj(nullptr);
931 JRT_END
932
933 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
934 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
935 JRT_END
936
937 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
938 // Returns an illegal exception to install into the current thread. The
939 // pending_exception flag is cleared so normal exception handling does not
940 // trigger. Any current installed exception will be overwritten. This
941 // method will be called during an exception unwind.
942
943 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
944 Handle exception(current, current->vm_result());
945 assert(exception() != nullptr, "vm result should be set");
946 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
947 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
948 current->set_vm_result(exception());
949 JRT_END
950
951 JRT_ENTRY(void, InterpreterRuntime::throw_identity_exception(JavaThread* current, oopDesc* obj))
952 Klass* klass = cast_to_oop(obj)->klass();
953 ResourceMark rm(THREAD);
954 const char* desc = "Cannot synchronize on an instance of value class ";
955 const char* className = klass->external_name();
956 size_t msglen = strlen(desc) + strlen(className) + 1;
957 char* message = NEW_RESOURCE_ARRAY(char, msglen);
958 if (nullptr == message) {
959 // Out of memory: can't create detailed error message
960 THROW_MSG(vmSymbols::java_lang_IdentityException(), className);
961 } else {
962 jio_snprintf(message, msglen, "%s%s", desc, className);
963 THROW_MSG(vmSymbols::java_lang_IdentityException(), message);
964 }
965 JRT_END
966
967 //------------------------------------------------------------------------------------------------------------------------
968 // Invokes
969
970 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
971 return method->orig_bytecode_at(method->bci_from(bcp));
972 JRT_END
973
974 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
975 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
976 JRT_END
977
978 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
979 JvmtiExport::post_raw_breakpoint(current, method, bcp);
980 JRT_END
981
982 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
983 LastFrameAccessor last_frame(current);
984 // extract receiver from the outgoing argument list if necessary
985 Handle receiver(current, nullptr);
986 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
987 bytecode == Bytecodes::_invokespecial) {
988 ResourceMark rm(current);
989 methodHandle m (current, last_frame.method());
990 Bytecode_invoke call(m, last_frame.bci());
991 Symbol* signature = call.signature();
992 receiver = Handle(current, last_frame.callee_receiver(signature));
993
994 assert(Universe::heap()->is_in_or_null(receiver()),
995 "sanity check");
996 assert(receiver.is_null() ||
997 !Universe::heap()->is_in(receiver->klass()),
998 "sanity check");
999 }
1000
1001 // resolve method
1002 CallInfo info;
1003 constantPoolHandle pool(current, last_frame.method()->constants());
1004
1005 methodHandle resolved_method;
1006
1007 int method_index = last_frame.get_index_u2(bytecode);
1008 {
1009 JvmtiHideSingleStepping jhss(current);
1010 JavaThread* THREAD = current; // For exception macros.
1011 LinkResolver::resolve_invoke(info, receiver, pool,
1012 method_index, bytecode,
1013 THREAD);
1014
1015 if (HAS_PENDING_EXCEPTION) {
1016 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
1017 // Preserve the original exception across the call to note_trap()
1018 PreserveExceptionMark pm(current);
1019 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
1020 note_trap(current, Deoptimization::Reason_null_check);
1021 }
1022 return;
1023 }
1024
1025 resolved_method = methodHandle(current, info.resolved_method());
1026 } // end JvmtiHideSingleStepping
1027
1028 update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
1029 }
1030
1031 void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
1032 methodHandle& resolved_method,
1033 constantPoolHandle& pool,
1034 int method_index) {
1035 // Don't allow safepoints until the method is cached.
1036 NoSafepointVerifier nsv;
1037
1038 // check if link resolution caused cpCache to be updated
1039 ConstantPoolCache* cache = pool->cache();
1040 if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
1041
1042 #ifdef ASSERT
1043 if (bytecode == Bytecodes::_invokeinterface) {
1044 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
1045 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
1046 // (see also CallInfo::set_interface for details)
1047 assert(info.call_kind() == CallInfo::vtable_call ||
1048 info.call_kind() == CallInfo::direct_call, "");
1049 assert(resolved_method->is_final() || info.has_vtable_index(),
1050 "should have been set already");
1051 } else if (!resolved_method->has_itable_index()) {
1052 // Resolved something like CharSequence.toString. Use vtable not itable.
1053 assert(info.call_kind() != CallInfo::itable_call, "");
1054 } else {
1055 // Setup itable entry
1056 assert(info.call_kind() == CallInfo::itable_call, "");
1057 int index = resolved_method->itable_index();
1058 assert(info.itable_index() == index, "");
1059 }
1060 } else if (bytecode == Bytecodes::_invokespecial) {
1061 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
1062 } else {
1063 assert(info.call_kind() == CallInfo::direct_call ||
1064 info.call_kind() == CallInfo::vtable_call, "");
1065 }
1066 #endif
1067 // Get sender and only set cpCache entry to resolved if it is not an
1068 // interface. The receiver for invokespecial calls within interface
1069 // methods must be checked for every call.
1070 InstanceKlass* sender = pool->pool_holder();
1071
1072 switch (info.call_kind()) {
1073 case CallInfo::direct_call:
1074 cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
1075 break;
1076 case CallInfo::vtable_call:
1077 cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
1078 break;
1079 case CallInfo::itable_call:
1080 cache->set_itable_call(
1081 bytecode,
1082 method_index,
1083 info.resolved_klass(),
1084 resolved_method,
1085 info.itable_index());
1086 break;
1087 default: ShouldNotReachHere();
1088 }
1089 }
1090
1091 void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
1092 constantPoolHandle& pool, TRAPS) {
1093 LinkInfo link_info(pool, method_index, bytecode, CHECK);
1094
1095 if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
1096 CallInfo call_info;
1097 switch (bytecode) {
1098 case Bytecodes::_invokevirtual: LinkResolver::cds_resolve_virtual_call (call_info, link_info, CHECK); break;
1099 case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
1100 case Bytecodes::_invokespecial: LinkResolver::cds_resolve_special_call (call_info, link_info, CHECK); break;
1101
1102 default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
1103 }
1104 methodHandle resolved_method(THREAD, call_info.resolved_method());
1105 guarantee(resolved_method->method_holder()->is_linked(), "");
1106 update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
1107 } else {
1108 // FIXME: why a shared class is not linked yet?
1109 // Can't link it here since there are no guarantees it'll be prelinked on the next run.
1110 ResourceMark rm;
1111 InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
1112 log_info(cds, resolve)("Not resolved: class not linked: %s %s %s",
1113 resolved_iklass->is_shared() ? "is_shared" : "",
1114 resolved_iklass->init_state_name(),
1115 resolved_iklass->external_name());
1116 }
1117 }
1118
1119 // First time execution: Resolve symbols, create a permanent MethodType object.
1120 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
1121 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
1122 LastFrameAccessor last_frame(current);
1123
1124 // resolve method
1125 CallInfo info;
1126 constantPoolHandle pool(current, last_frame.method()->constants());
1127 int method_index = last_frame.get_index_u2(bytecode);
1128 {
1129 JvmtiHideSingleStepping jhss(current);
1130 JavaThread* THREAD = current; // For exception macros.
1131 LinkResolver::resolve_invoke(info, Handle(), pool,
1132 method_index, bytecode,
1133 CHECK);
1134 } // end JvmtiHideSingleStepping
1135
1136 pool->cache()->set_method_handle(method_index, info);
1137 }
1138
1139 // First time execution: Resolve symbols, create a permanent CallSite object.
1140 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
1141 LastFrameAccessor last_frame(current);
1142 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
1143
1144 // resolve method
1145 CallInfo info;
1146 constantPoolHandle pool(current, last_frame.method()->constants());
1147 int index = last_frame.get_index_u4(bytecode);
1148 {
1149 JvmtiHideSingleStepping jhss(current);
1150 JavaThread* THREAD = current; // For exception macros.
1151 LinkResolver::resolve_invoke(info, Handle(), pool,
1152 index, bytecode, CHECK);
1153 } // end JvmtiHideSingleStepping
1154
1155 pool->cache()->set_dynamic_call(info, index);
1156 }
1157
1158 // This function is the interface to the assembly code. It returns the resolved
1159 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
1160 // This function will check for redefinition!
1161 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
1162 switch (bytecode) {
1163 case Bytecodes::_getstatic:
1164 case Bytecodes::_putstatic:
1165 case Bytecodes::_getfield:
1166 case Bytecodes::_putfield:
1167 resolve_get_put(current, bytecode);
1168 break;
1169 case Bytecodes::_invokevirtual:
1170 case Bytecodes::_invokespecial:
1171 case Bytecodes::_invokestatic:
1172 case Bytecodes::_invokeinterface:
1173 resolve_invoke(current, bytecode);
1174 break;
1175 case Bytecodes::_invokehandle:
1176 resolve_invokehandle(current);
1177 break;
1178 case Bytecodes::_invokedynamic:
1179 resolve_invokedynamic(current);
1180 break;
1181 default:
1182 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1183 break;
1184 }
1185 }
1186 JRT_END
1187
1188 //------------------------------------------------------------------------------------------------------------------------
1189 // Miscellaneous
1190
1191
1192 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1193 // Enable WXWrite: the function is called directly by interpreter.
1194 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1195
1196 // frequency_counter_overflow_inner can throw async exception.
1197 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1198 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1199 if (branch_bcp != nullptr && nm != nullptr) {
1200 // This was a successful request for an OSR nmethod. Because
1201 // frequency_counter_overflow_inner ends with a safepoint check,
1202 // nm could have been unloaded so look it up again. It's unsafe
1203 // to examine nm directly since it might have been freed and used
1204 // for something else.
1205 LastFrameAccessor last_frame(current);
1206 Method* method = last_frame.method();
1207 int bci = method->bci_from(last_frame.bcp());
1208 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1209 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1210 if (nm != nullptr && bs_nm != nullptr) {
1211 // in case the transition passed a safepoint we need to barrier this again
1212 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1213 nm = nullptr;
1214 }
1215 }
1216 }
1217 if (nm != nullptr && current->is_interp_only_mode()) {
1218 // Normally we never get an nm if is_interp_only_mode() is true, because
1219 // policy()->event has a check for this and won't compile the method when
1220 // true. However, it's possible for is_interp_only_mode() to become true
1221 // during the compilation. We don't want to return the nm in that case
1222 // because we want to continue to execute interpreted.
1223 nm = nullptr;
1224 }
1225 #ifndef PRODUCT
1226 if (TraceOnStackReplacement) {
1227 if (nm != nullptr) {
1228 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1229 nm->print();
1230 }
1231 }
1232 #endif
1233 return nm;
1234 }
1235
1236 JRT_ENTRY(nmethod*,
1237 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1238 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1239 // flag, in case this method triggers classloading which will call into Java.
1240 UnlockFlagSaver fs(current);
1241
1242 LastFrameAccessor last_frame(current);
1243 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1244 methodHandle method(current, last_frame.method());
1245 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1246 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1247
1248 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1249
1250 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1251 if (osr_nm != nullptr && bs_nm != nullptr) {
1252 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1253 osr_nm = nullptr;
1254 }
1255 }
1256 return osr_nm;
1257 JRT_END
1258
1259 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1260 assert(ProfileInterpreter, "must be profiling interpreter");
1261 int bci = method->bci_from(cur_bcp);
1262 MethodData* mdo = method->method_data();
1263 if (mdo == nullptr) return 0;
1264 return mdo->bci_to_di(bci);
1265 JRT_END
1266
1267 #ifdef ASSERT
1268 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1269 assert(ProfileInterpreter, "must be profiling interpreter");
1270
1271 MethodData* mdo = method->method_data();
1272 assert(mdo != nullptr, "must not be null");
1273
1274 int bci = method->bci_from(bcp);
1275
1276 address mdp2 = mdo->bci_to_dp(bci);
1277 if (mdp != mdp2) {
1278 ResourceMark rm;
1279 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1280 int current_di = mdo->dp_to_di(mdp);
1281 int expected_di = mdo->dp_to_di(mdp2);
1282 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1283 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1284 int approx_bci = -1;
1285 if (current_di >= 0) {
1286 approx_bci = mdo->data_at(current_di)->bci();
1287 }
1288 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1289 mdo->print_on(tty);
1290 method->print_codes();
1291 }
1292 assert(mdp == mdp2, "wrong mdp");
1293 JRT_END
1294 #endif // ASSERT
1295
1296 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1297 assert(ProfileInterpreter, "must be profiling interpreter");
1298 ResourceMark rm(current);
1299 LastFrameAccessor last_frame(current);
1300 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1301 MethodData* h_mdo = last_frame.method()->method_data();
1302
1303 // Grab a lock to ensure atomic access to setting the return bci and
1304 // the displacement. This can block and GC, invalidating all naked oops.
1305 MutexLocker ml(RetData_lock);
1306
1307 // ProfileData is essentially a wrapper around a derived oop, so we
1308 // need to take the lock before making any ProfileData structures.
1309 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1310 guarantee(data != nullptr, "profile data must be valid");
1311 RetData* rdata = data->as_RetData();
1312 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1313 last_frame.set_mdp(new_mdp);
1314 JRT_END
1315
1316 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1317 return Method::build_method_counters(current, m);
1318 JRT_END
1319
1320
1321 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1322 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1323 // stack traversal automatically takes care of preserving arguments for invoke, so
1324 // this is no longer needed.
1325
1326 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1327 // if this is called during a safepoint
1328
1329 if (JvmtiExport::should_post_single_step()) {
1330 // This function is called by the interpreter when single stepping. Such single
1331 // stepping could unwind a frame. Then, it is important that we process any frames
1332 // that we might return into.
1333 StackWatermarkSet::before_unwind(current);
1334
1335 // We are called during regular safepoints and when the VM is
1336 // single stepping. If any thread is marked for single stepping,
1337 // then we may have JVMTI work to do.
1338 LastFrameAccessor last_frame(current);
1339 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1340 }
1341 JRT_END
1342
1343 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1344 assert(current == JavaThread::current(), "pre-condition");
1345 // This function is called by the interpreter when the return poll found a reason
1346 // to call the VM. The reason could be that we are returning into a not yet safe
1347 // to access frame. We handle that below.
1348 // Note that this path does not check for single stepping, because we do not want
1349 // to single step when unwinding frames for an exception being thrown. Instead,
1350 // such single stepping code will use the safepoint table, which will use the
1351 // InterpreterRuntime::at_safepoint callback.
1352 StackWatermarkSet::before_unwind(current);
1353 JRT_END
1354
1355 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1356 ResolvedFieldEntry *entry))
1357
1358 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
1359 // check the access_flags for the field in the klass
1360
1361 InstanceKlass* ik = entry->field_holder();
1362 int index = entry->field_index();
1363 if (!ik->field_status(index).is_access_watched()) return;
1364
1365 bool is_static = (obj == nullptr);
1366 bool is_flat = entry->is_flat();
1367 HandleMark hm(current);
1368
1369 Handle h_obj;
1370 if (!is_static) {
1371 // non-static field accessors have an object, but we need a handle
1372 h_obj = Handle(current, obj);
1373 }
1374 InstanceKlass* field_holder = entry->field_holder(); // HERE
1375 jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static, is_flat);
1376 LastFrameAccessor last_frame(current);
1377 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1378 JRT_END
1379
1380 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1381 ResolvedFieldEntry *entry, jvalue *value))
1382
1383 assert(entry->is_valid(), "Invalid ResolvedFieldEntry");
1384 InstanceKlass* ik = entry->field_holder();
1385
1386 // check the access_flags for the field in the klass
1387 int index = entry->field_index();
1388 // bail out if field modifications are not watched
1389 if (!ik->field_status(index).is_modification_watched()) return;
1390
1391 char sig_type = '\0';
1392
1393 switch((TosState)entry->tos_state()) {
1394 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1395 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1396 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1397 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1398 case itos: sig_type = JVM_SIGNATURE_INT; break;
1399 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1400 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1401 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1402 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1403 default: ShouldNotReachHere(); return;
1404 }
1405
1406 bool is_static = (obj == nullptr);
1407 bool is_flat = entry->is_flat();
1408
1409 HandleMark hm(current);
1410 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static, is_flat);
1411 jvalue fvalue;
1412 #ifdef _LP64
1413 fvalue = *value;
1414 #else
1415 // Long/double values are stored unaligned and also noncontiguously with
1416 // tagged stacks. We can't just do a simple assignment even in the non-
1417 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1418 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1419 // We assume that the two halves of longs/doubles are stored in interpreter
1420 // stack slots in platform-endian order.
1421 jlong_accessor u;
1422 jint* newval = (jint*)value;
1423 u.words[0] = newval[0];
1424 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1425 fvalue.j = u.long_value;
1426 #endif // _LP64
1427
1428 Handle h_obj;
1429 if (!is_static) {
1430 // non-static field accessors have an object, but we need a handle
1431 h_obj = Handle(current, obj);
1432 }
1433
1434 LastFrameAccessor last_frame(current);
1435 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1436 fid, sig_type, &fvalue);
1437 JRT_END
1438
1439 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1440 LastFrameAccessor last_frame(current);
1441 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1442 JRT_END
1443
1444
1445 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1446 // before transitioning to VM, and restore it after transitioning back
1447 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1448 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1449 LastFrameAccessor last_frame(current);
1450 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1451 JRT_END
1452
1453 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1454 {
1455 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1456 }
1457 JRT_END
1458
1459
1460 // Implementation of SignatureHandlerLibrary
1461
1462 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1463 // Dummy definition (else normalization method is defined in CPU
1464 // dependent code)
1465 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1466 return fingerprint;
1467 }
1468 #endif
1469
1470 address SignatureHandlerLibrary::set_handler_blob() {
1471 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1472 if (handler_blob == nullptr) {
1473 return nullptr;
1474 }
1475 address handler = handler_blob->code_begin();
1476 _handler_blob = handler_blob;
1477 _handler = handler;
1478 return handler;
1479 }
1480
1481 void SignatureHandlerLibrary::initialize() {
1482 if (_fingerprints != nullptr) {
1483 return;
1484 }
1485 if (set_handler_blob() == nullptr) {
1486 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1487 }
1488
1489 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1490 SignatureHandlerLibrary::buffer_size);
1491 _buffer = bb->code_begin();
1492
1493 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1494 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1495 }
1496
1497 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1498 address handler = _handler;
1499 int insts_size = buffer->pure_insts_size();
1500 if (handler + insts_size > _handler_blob->code_end()) {
1501 // get a new handler blob
1502 handler = set_handler_blob();
1503 }
1504 if (handler != nullptr) {
1505 memcpy(handler, buffer->insts_begin(), insts_size);
1506 pd_set_handler(handler);
1507 ICache::invalidate_range(handler, insts_size);
1508 _handler = handler + insts_size;
1509 }
1510 return handler;
1511 }
1512
1513 void SignatureHandlerLibrary::add(const methodHandle& method) {
1514 if (method->signature_handler() == nullptr) {
1515 // use slow signature handler if we can't do better
1516 int handler_index = -1;
1517 // check if we can use customized (fast) signature handler
1518 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1519 // use customized signature handler
1520 MutexLocker mu(SignatureHandlerLibrary_lock);
1521 // make sure data structure is initialized
1522 initialize();
1523 // lookup method signature's fingerprint
1524 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1525 // allow CPU dependent code to optimize the fingerprints for the fast handler
1526 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1527 handler_index = _fingerprints->find(fingerprint);
1528 // create handler if necessary
1529 if (handler_index < 0) {
1530 ResourceMark rm;
1531 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1532 CodeBuffer buffer((address)(_buffer + align_offset),
1533 checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1534 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1535 // copy into code heap
1536 address handler = set_handler(&buffer);
1537 if (handler == nullptr) {
1538 // use slow signature handler (without memorizing it in the fingerprints)
1539 } else {
1540 // debugging support
1541 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1542 ttyLocker ttyl;
1543 tty->cr();
1544 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1545 _handlers->length(),
1546 (method->is_static() ? "static" : "receiver"),
1547 method->name_and_sig_as_C_string(),
1548 fingerprint,
1549 buffer.insts_size());
1550 if (buffer.insts_size() > 0) {
1551 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1552 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1553 }
1554 #ifndef PRODUCT
1555 address rh_begin = Interpreter::result_handler(method()->result_type());
1556 if (CodeCache::contains(rh_begin)) {
1557 // else it might be special platform dependent values
1558 tty->print_cr(" --- associated result handler ---");
1559 address rh_end = rh_begin;
1560 while (*(int*)rh_end != 0) {
1561 rh_end += sizeof(int);
1562 }
1563 Disassembler::decode(rh_begin, rh_end);
1564 } else {
1565 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1566 }
1567 #endif
1568 }
1569 // add handler to library
1570 _fingerprints->append(fingerprint);
1571 _handlers->append(handler);
1572 // set handler index
1573 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1574 handler_index = _fingerprints->length() - 1;
1575 }
1576 }
1577 // Set handler under SignatureHandlerLibrary_lock
1578 if (handler_index < 0) {
1579 // use generic signature handler
1580 method->set_signature_handler(Interpreter::slow_signature_handler());
1581 } else {
1582 // set handler
1583 method->set_signature_handler(_handlers->at(handler_index));
1584 }
1585 } else {
1586 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1587 // use generic signature handler
1588 method->set_signature_handler(Interpreter::slow_signature_handler());
1589 }
1590 }
1591 #ifdef ASSERT
1592 int handler_index = -1;
1593 int fingerprint_index = -2;
1594 {
1595 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1596 // in any way if accessed from multiple threads. To avoid races with another
1597 // thread which may change the arrays in the above, mutex protected block, we
1598 // have to protect this read access here with the same mutex as well!
1599 MutexLocker mu(SignatureHandlerLibrary_lock);
1600 if (_handlers != nullptr) {
1601 handler_index = _handlers->find(method->signature_handler());
1602 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1603 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1604 fingerprint_index = _fingerprints->find(fingerprint);
1605 }
1606 }
1607 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1608 handler_index == fingerprint_index, "sanity check");
1609 #endif // ASSERT
1610 }
1611
1612 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1613 int handler_index = -1;
1614 // use customized signature handler
1615 MutexLocker mu(SignatureHandlerLibrary_lock);
1616 // make sure data structure is initialized
1617 initialize();
1618 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1619 handler_index = _fingerprints->find(fingerprint);
1620 // create handler if necessary
1621 if (handler_index < 0) {
1622 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1623 tty->cr();
1624 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1625 _handlers->length(),
1626 p2i(handler),
1627 fingerprint);
1628 }
1629 _fingerprints->append(fingerprint);
1630 _handlers->append(handler);
1631 } else {
1632 if (PrintSignatureHandlers) {
1633 tty->cr();
1634 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1635 _handlers->length(),
1636 fingerprint,
1637 p2i(_handlers->at(handler_index)),
1638 p2i(handler));
1639 }
1640 }
1641 }
1642
1643
1644 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1645 address SignatureHandlerLibrary::_handler = nullptr;
1646 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1647 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1648 address SignatureHandlerLibrary::_buffer = nullptr;
1649
1650
1651 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1652 methodHandle m(current, method);
1653 assert(m->is_native(), "sanity check");
1654 // lookup native function entry point if it doesn't exist
1655 if (!m->has_native_function()) {
1656 NativeLookup::lookup(m, CHECK);
1657 }
1658 // make sure signature handler is installed
1659 SignatureHandlerLibrary::add(m);
1660 // The interpreter entry point checks the signature handler first,
1661 // before trying to fetch the native entry point and klass mirror.
1662 // We must set the signature handler last, so that multiple processors
1663 // preparing the same method will be sure to see non-null entry & mirror.
1664 JRT_END
1665
1666 #if defined(IA32) || defined(AMD64) || defined(ARM)
1667 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1668 assert(current == JavaThread::current(), "pre-condition");
1669 if (src_address == dest_address) {
1670 return;
1671 }
1672 ResourceMark rm;
1673 LastFrameAccessor last_frame(current);
1674 assert(last_frame.is_interpreted_frame(), "");
1675 jint bci = last_frame.bci();
1676 methodHandle mh(current, last_frame.method());
1677 Bytecode_invoke invoke(mh, bci);
1678 ArgumentSizeComputer asc(invoke.signature());
1679 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1680 Copy::conjoint_jbytes(src_address, dest_address,
1681 size_of_arguments * Interpreter::stackElementSize);
1682 JRT_END
1683 #endif
1684
1685 #if INCLUDE_JVMTI
1686 // This is a support of the JVMTI PopFrame interface.
1687 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1688 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1689 // The member_name argument is a saved reference (in local#0) to the member_name.
1690 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1691 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1692 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1693 Method* method, address bcp))
1694 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1695 if (code != Bytecodes::_invokestatic) {
1696 return;
1697 }
1698 ConstantPool* cpool = method->constants();
1699 int cp_index = Bytes::get_native_u2(bcp + 1);
1700 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1701 Symbol* mname = cpool->name_ref_at(cp_index, code);
1702
1703 if (MethodHandles::has_member_arg(cname, mname)) {
1704 oop member_name_oop = cast_to_oop(member_name);
1705 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1706 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1707 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1708 }
1709 current->set_vm_result(member_name_oop);
1710 } else {
1711 current->set_vm_result(nullptr);
1712 }
1713 JRT_END
1714 #endif // INCLUDE_JVMTI
1715
1716 #ifndef PRODUCT
1717 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1718 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1719 // The generated code still uses call_VM because that will set up the frame pointer for
1720 // bcp and method.
1721 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1722 assert(current == JavaThread::current(), "pre-condition");
1723 LastFrameAccessor last_frame(current);
1724 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1725 methodHandle mh(current, last_frame.method());
1726 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1727 return preserve_this_value;
1728 JRT_END
1729 #endif // !PRODUCT