1 /*
2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "compiler/compilationPolicy.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "gc/shared/barrierSetNMethod.hpp"
35 #include "gc/shared/collectedHeap.hpp"
36 #include "interpreter/bytecodeTracer.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "interpreter/interpreterRuntime.hpp"
39 #include "interpreter/linkResolver.hpp"
40 #include "interpreter/templateTable.hpp"
41 #include "jvm_io.h"
42 #include "logging/log.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.hpp"
46 #include "oops/constantPool.hpp"
47 #include "oops/cpCache.inline.hpp"
48 #include "oops/instanceKlass.inline.hpp"
49 #include "oops/klass.inline.hpp"
50 #include "oops/methodData.hpp"
51 #include "oops/objArrayKlass.hpp"
52 #include "oops/objArrayOop.inline.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "oops/symbol.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "prims/methodHandles.hpp"
57 #include "prims/nativeLookup.hpp"
58 #include "runtime/atomic.hpp"
59 #include "runtime/continuation.hpp"
60 #include "runtime/deoptimization.hpp"
61 #include "runtime/fieldDescriptor.inline.hpp"
62 #include "runtime/frame.inline.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/icache.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/java.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/jfieldIDWorkaround.hpp"
69 #include "runtime/osThread.hpp"
70 #include "runtime/sharedRuntime.hpp"
71 #include "runtime/stackWatermarkSet.hpp"
72 #include "runtime/stubRoutines.hpp"
73 #include "runtime/synchronizer.hpp"
74 #include "runtime/threadCritical.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/copy.hpp"
77 #include "utilities/events.hpp"
78 #ifdef COMPILER2
79 #include "opto/runtime.hpp"
80 #endif
81
82 // Helper class to access current interpreter state
83 class LastFrameAccessor : public StackObj {
84 frame _last_frame;
85 public:
86 LastFrameAccessor(JavaThread* current) {
87 assert(current == Thread::current(), "sanity");
88 _last_frame = current->last_frame();
89 }
90 bool is_interpreted_frame() const { return _last_frame.is_interpreted_frame(); }
91 Method* method() const { return _last_frame.interpreter_frame_method(); }
92 address bcp() const { return _last_frame.interpreter_frame_bcp(); }
93 int bci() const { return _last_frame.interpreter_frame_bci(); }
94 address mdp() const { return _last_frame.interpreter_frame_mdp(); }
95
96 void set_bcp(address bcp) { _last_frame.interpreter_frame_set_bcp(bcp); }
97 void set_mdp(address dp) { _last_frame.interpreter_frame_set_mdp(dp); }
98
99 // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
100 Bytecodes::Code code() const { return Bytecodes::code_at(method(), bcp()); }
101
102 Bytecode bytecode() const { return Bytecode(method(), bcp()); }
103 int get_index_u1(Bytecodes::Code bc) const { return bytecode().get_index_u1(bc); }
104 int get_index_u2(Bytecodes::Code bc) const { return bytecode().get_index_u2(bc); }
105 int get_index_u2_cpcache(Bytecodes::Code bc) const
106 { return bytecode().get_index_u2_cpcache(bc); }
107 int get_index_u4(Bytecodes::Code bc) const { return bytecode().get_index_u4(bc); }
108 int number_of_dimensions() const { return bcp()[3]; }
109 ConstantPoolCacheEntry* cache_entry_at(int i) const
110 { return method()->constants()->cache()->entry_at(i); }
111 ConstantPoolCacheEntry* cache_entry() const { return cache_entry_at(Bytes::get_native_u2(bcp() + 1)); }
112
113 oop callee_receiver(Symbol* signature) {
114 return _last_frame.interpreter_callee_receiver(signature);
115 }
116 BasicObjectLock* monitor_begin() const {
117 return _last_frame.interpreter_frame_monitor_begin();
118 }
119 BasicObjectLock* monitor_end() const {
120 return _last_frame.interpreter_frame_monitor_end();
121 }
122 BasicObjectLock* next_monitor(BasicObjectLock* current) const {
123 return _last_frame.next_monitor_in_interpreter_frame(current);
124 }
125
126 frame& get_frame() { return _last_frame; }
127 };
128
129 //------------------------------------------------------------------------------------------------------------------------
130 // State accessors
131
132 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
133 LastFrameAccessor last_frame(current);
134 last_frame.set_bcp(bcp);
135 if (ProfileInterpreter) {
136 // ProfileTraps uses MDOs independently of ProfileInterpreter.
137 // That is why we must check both ProfileInterpreter and mdo != nullptr.
138 MethodData* mdo = last_frame.method()->method_data();
139 if (mdo != nullptr) {
140 NEEDS_CLEANUP;
141 last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
142 }
143 }
144 }
145
146 //------------------------------------------------------------------------------------------------------------------------
147 // Constants
148
149
150 JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
151 // access constant pool
152 LastFrameAccessor last_frame(current);
153 ConstantPool* pool = last_frame.method()->constants();
154 int index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
155 constantTag tag = pool->tag_at(index);
156
157 assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
158 Klass* klass = pool->klass_at(index, CHECK);
159 oop java_class = klass->java_mirror();
160 current->set_vm_result(java_class);
161 JRT_END
162
163 JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
164 assert(bytecode == Bytecodes::_ldc ||
165 bytecode == Bytecodes::_ldc_w ||
166 bytecode == Bytecodes::_ldc2_w ||
167 bytecode == Bytecodes::_fast_aldc ||
168 bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
169 ResourceMark rm(current);
170 const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
171 bytecode == Bytecodes::_fast_aldc_w);
172 LastFrameAccessor last_frame(current);
173 methodHandle m (current, last_frame.method());
174 Bytecode_loadconstant ldc(m, last_frame.bci());
175
176 // Double-check the size. (Condy can have any type.)
177 BasicType type = ldc.result_type();
178 switch (type2size[type]) {
179 case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
180 case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
181 default: ShouldNotReachHere();
182 }
183
184 // Resolve the constant. This does not do unboxing.
185 // But it does replace Universe::the_null_sentinel by null.
186 oop result = ldc.resolve_constant(CHECK);
187 assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
188
189 #ifdef ASSERT
190 {
191 // The bytecode wrappers aren't GC-safe so construct a new one
192 Bytecode_loadconstant ldc2(m, last_frame.bci());
193 int rindex = ldc2.cache_index();
194 if (rindex < 0)
195 rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
196 if (rindex >= 0) {
197 oop coop = m->constants()->resolved_reference_at(rindex);
198 oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
199 assert(roop == coop, "expected result for assembly code");
200 }
201 }
202 #endif
203 current->set_vm_result(result);
204 if (!is_fast_aldc) {
205 // Tell the interpreter how to unbox the primitive.
206 guarantee(java_lang_boxing_object::is_instance(result, type), "");
207 int offset = java_lang_boxing_object::value_offset(type);
208 intptr_t flags = ((as_TosState(type) << ConstantPoolCacheEntry::tos_state_shift)
209 | (offset & ConstantPoolCacheEntry::field_index_mask));
210 current->set_vm_result_2((Metadata*)flags);
211 }
212 }
213 JRT_END
214
215
216 //------------------------------------------------------------------------------------------------------------------------
217 // Allocation
218
219 JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
220 Klass* k = pool->klass_at(index, CHECK);
221 InstanceKlass* klass = InstanceKlass::cast(k);
222
223 // Make sure we are not instantiating an abstract klass
224 klass->check_valid_for_instantiation(true, CHECK);
225
226 // Make sure klass is initialized
227 klass->initialize(CHECK);
228
229 // At this point the class may not be fully initialized
230 // because of recursive initialization. If it is fully
231 // initialized & has_finalized is not set, we rewrite
232 // it into its fast version (Note: no locking is needed
233 // here since this is an atomic byte write and can be
234 // done more than once).
235 //
236 // Note: In case of classes with has_finalized we don't
237 // rewrite since that saves us an extra check in
238 // the fast version which then would call the
239 // slow version anyway (and do a call back into
240 // Java).
241 // If we have a breakpoint, then we don't rewrite
242 // because the _breakpoint bytecode would be lost.
243 oop obj = klass->allocate_instance(CHECK);
244 current->set_vm_result(obj);
245 JRT_END
246
247
248 JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
249 oop obj = oopFactory::new_typeArray(type, size, CHECK);
250 current->set_vm_result(obj);
251 JRT_END
252
253
254 JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
255 Klass* klass = pool->klass_at(index, CHECK);
256 objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
257 current->set_vm_result(obj);
258 JRT_END
259
260
261 JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
262 // We may want to pass in more arguments - could make this slightly faster
263 LastFrameAccessor last_frame(current);
264 ConstantPool* constants = last_frame.method()->constants();
265 int i = last_frame.get_index_u2(Bytecodes::_multianewarray);
266 Klass* klass = constants->klass_at(i, CHECK);
267 int nof_dims = last_frame.number_of_dimensions();
268 assert(klass->is_klass(), "not a class");
269 assert(nof_dims >= 1, "multianewarray rank must be nonzero");
270
271 // We must create an array of jints to pass to multi_allocate.
272 ResourceMark rm(current);
273 const int small_dims = 10;
274 jint dim_array[small_dims];
275 jint *dims = &dim_array[0];
276 if (nof_dims > small_dims) {
277 dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
278 }
279 for (int index = 0; index < nof_dims; index++) {
280 // offset from first_size_address is addressed as local[index]
281 int n = Interpreter::local_offset_in_bytes(index)/jintSize;
282 dims[index] = first_size_address[n];
283 }
284 oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
285 current->set_vm_result(obj);
286 JRT_END
287
288
289 JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
290 assert(oopDesc::is_oop(obj), "must be a valid oop");
291 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
292 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
293 JRT_END
294
295
296 // Quicken instance-of and check-cast bytecodes
297 JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
298 // Force resolving; quicken the bytecode
299 LastFrameAccessor last_frame(current);
300 int which = last_frame.get_index_u2(Bytecodes::_checkcast);
301 ConstantPool* cpool = last_frame.method()->constants();
302 // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
303 // program we might have seen an unquick'd bytecode in the interpreter but have another
304 // thread quicken the bytecode before we get here.
305 // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
306 Klass* klass = cpool->klass_at(which, CHECK);
307 current->set_vm_result_2(klass);
308 JRT_END
309
310
311 //------------------------------------------------------------------------------------------------------------------------
312 // Exceptions
313
314 void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
315 const methodHandle& trap_method, int trap_bci) {
316 if (trap_method.not_null()) {
317 MethodData* trap_mdo = trap_method->method_data();
318 if (trap_mdo == nullptr) {
319 ExceptionMark em(current);
320 JavaThread* THREAD = current; // For exception macros.
321 Method::build_profiling_method_data(trap_method, THREAD);
322 if (HAS_PENDING_EXCEPTION) {
323 // Only metaspace OOM is expected. No Java code executed.
324 assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
325 "we expect only an OOM error here");
326 CLEAR_PENDING_EXCEPTION;
327 }
328 trap_mdo = trap_method->method_data();
329 // and fall through...
330 }
331 if (trap_mdo != nullptr) {
332 // Update per-method count of trap events. The interpreter
333 // is updating the MDO to simulate the effect of compiler traps.
334 Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
335 }
336 }
337 }
338
339 // Assume the compiler is (or will be) interested in this event.
340 // If necessary, create an MDO to hold the information, and record it.
341 void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
342 assert(ProfileTraps, "call me only if profiling");
343 LastFrameAccessor last_frame(current);
344 methodHandle trap_method(current, last_frame.method());
345 int trap_bci = trap_method->bci_from(last_frame.bcp());
346 note_trap_inner(current, reason, trap_method, trap_bci);
347 }
348
349 static Handle get_preinitialized_exception(Klass* k, TRAPS) {
350 // get klass
351 InstanceKlass* klass = InstanceKlass::cast(k);
352 assert(klass->is_initialized(),
353 "this klass should have been initialized during VM initialization");
354 // create instance - do not call constructor since we may have no
355 // (java) stack space left (should assert constructor is empty)
356 Handle exception;
357 oop exception_oop = klass->allocate_instance(CHECK_(exception));
358 exception = Handle(THREAD, exception_oop);
359 if (StackTraceInThrowable) {
360 java_lang_Throwable::fill_in_stack_trace(exception);
361 }
362 return exception;
363 }
364
365 // Special handling for stack overflow: since we don't have any (java) stack
366 // space left we use the pre-allocated & pre-initialized StackOverflowError
367 // klass to create an stack overflow error instance. We do not call its
368 // constructor for the same reason (it is empty, anyway).
369 JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
370 Handle exception = get_preinitialized_exception(
371 vmClasses::StackOverflowError_klass(),
372 CHECK);
373 // Increment counter for hs_err file reporting
374 Atomic::inc(&Exceptions::_stack_overflow_errors);
375 // Remove the ScopedValue bindings in case we got a StackOverflowError
376 // while we were trying to manipulate ScopedValue bindings.
377 current->clear_scopedValueBindings();
378 THROW_HANDLE(exception);
379 JRT_END
380
381 JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
382 Handle exception = get_preinitialized_exception(
383 vmClasses::StackOverflowError_klass(),
384 CHECK);
385 java_lang_Throwable::set_message(exception(),
386 Universe::delayed_stack_overflow_error_message());
387 // Increment counter for hs_err file reporting
388 Atomic::inc(&Exceptions::_stack_overflow_errors);
389 // Remove the ScopedValue bindings in case we got a StackOverflowError
390 // while we were trying to manipulate ScopedValue bindings.
391 current->clear_scopedValueBindings();
392 THROW_HANDLE(exception);
393 JRT_END
394
395 JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
396 // lookup exception klass
397 TempNewSymbol s = SymbolTable::new_symbol(name);
398 if (ProfileTraps) {
399 if (s == vmSymbols::java_lang_ArithmeticException()) {
400 note_trap(current, Deoptimization::Reason_div0_check);
401 } else if (s == vmSymbols::java_lang_NullPointerException()) {
402 note_trap(current, Deoptimization::Reason_null_check);
403 }
404 }
405 // create exception
406 Handle exception = Exceptions::new_exception(current, s, message);
407 current->set_vm_result(exception());
408 JRT_END
409
410
411 JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
412 // Produce the error message first because note_trap can safepoint
413 ResourceMark rm(current);
414 const char* klass_name = obj->klass()->external_name();
415 // lookup exception klass
416 TempNewSymbol s = SymbolTable::new_symbol(name);
417 if (ProfileTraps) {
418 if (s == vmSymbols::java_lang_ArrayStoreException()) {
419 note_trap(current, Deoptimization::Reason_array_check);
420 } else {
421 note_trap(current, Deoptimization::Reason_class_check);
422 }
423 }
424 // create exception, with klass name as detail message
425 Handle exception = Exceptions::new_exception(current, s, klass_name);
426 current->set_vm_result(exception());
427 JRT_END
428
429 JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
430 // Produce the error message first because note_trap can safepoint
431 ResourceMark rm(current);
432 stringStream ss;
433 ss.print("Index %d out of bounds for length %d", index, a->length());
434
435 if (ProfileTraps) {
436 note_trap(current, Deoptimization::Reason_range_check);
437 }
438
439 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
440 JRT_END
441
442 JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
443 JavaThread* current, oopDesc* obj))
444
445 // Produce the error message first because note_trap can safepoint
446 ResourceMark rm(current);
447 char* message = SharedRuntime::generate_class_cast_message(
448 current, obj->klass());
449
450 if (ProfileTraps) {
451 note_trap(current, Deoptimization::Reason_class_check);
452 }
453
454 // create exception
455 THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
456 JRT_END
457
458 // exception_handler_for_exception(...) returns the continuation address,
459 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
460 // The exception oop is returned to make sure it is preserved over GC (it
461 // is only on the stack if the exception was thrown explicitly via athrow).
462 // During this operation, the expression stack contains the values for the
463 // bci where the exception happened. If the exception was propagated back
464 // from a call, the expression stack contains the values for the bci at the
465 // invoke w/o arguments (i.e., as if one were inside the call).
466 JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
467 // We get here after we have unwound from a callee throwing an exception
468 // into the interpreter. Any deferred stack processing is notified of
469 // the event via the StackWatermarkSet.
470 StackWatermarkSet::after_unwind(current);
471
472 LastFrameAccessor last_frame(current);
473 Handle h_exception(current, exception);
474 methodHandle h_method (current, last_frame.method());
475 constantPoolHandle h_constants(current, h_method->constants());
476 bool should_repeat;
477 int handler_bci;
478 int current_bci = last_frame.bci();
479
480 if (current->frames_to_pop_failed_realloc() > 0) {
481 // Allocation of scalar replaced object used in this frame
482 // failed. Unconditionally pop the frame.
483 current->dec_frames_to_pop_failed_realloc();
484 current->set_vm_result(h_exception());
485 // If the method is synchronized we already unlocked the monitor
486 // during deoptimization so the interpreter needs to skip it when
487 // the frame is popped.
488 current->set_do_not_unlock_if_synchronized(true);
489 return Interpreter::remove_activation_entry();
490 }
491
492 // Need to do this check first since when _do_not_unlock_if_synchronized
493 // is set, we don't want to trigger any classloading which may make calls
494 // into java, or surprisingly find a matching exception handler for bci 0
495 // since at this moment the method hasn't been "officially" entered yet.
496 if (current->do_not_unlock_if_synchronized()) {
497 ResourceMark rm;
498 assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
499 current->set_vm_result(exception);
500 return Interpreter::remove_activation_entry();
501 }
502
503 do {
504 should_repeat = false;
505
506 // assertions
507 assert(h_exception.not_null(), "null exceptions should be handled by athrow");
508 // Check that exception is a subclass of Throwable.
509 assert(h_exception->is_a(vmClasses::Throwable_klass()),
510 "Exception not subclass of Throwable");
511
512 // tracing
513 if (log_is_enabled(Info, exceptions)) {
514 ResourceMark rm(current);
515 stringStream tempst;
516 tempst.print("interpreter method <%s>\n"
517 " at bci %d for thread " INTPTR_FORMAT " (%s)",
518 h_method->print_value_string(), current_bci, p2i(current), current->name());
519 Exceptions::log_exception(h_exception, tempst.as_string());
520 }
521 // Don't go paging in something which won't be used.
522 // else if (extable->length() == 0) {
523 // // disabled for now - interpreter is not using shortcut yet
524 // // (shortcut is not to call runtime if we have no exception handlers)
525 // // warning("performance bug: should not call runtime if method has no exception handlers");
526 // }
527 // for AbortVMOnException flag
528 Exceptions::debug_check_abort(h_exception);
529
530 // exception handler lookup
531 Klass* klass = h_exception->klass();
532 handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
533 if (HAS_PENDING_EXCEPTION) {
534 // We threw an exception while trying to find the exception handler.
535 // Transfer the new exception to the exception handle which will
536 // be set into thread local storage, and do another lookup for an
537 // exception handler for this exception, this time starting at the
538 // BCI of the exception handler which caused the exception to be
539 // thrown (bug 4307310).
540 h_exception = Handle(THREAD, PENDING_EXCEPTION);
541 CLEAR_PENDING_EXCEPTION;
542 if (handler_bci >= 0) {
543 current_bci = handler_bci;
544 should_repeat = true;
545 }
546 }
547 } while (should_repeat == true);
548
549 #if INCLUDE_JVMCI
550 if (EnableJVMCI && h_method->method_data() != nullptr) {
551 ResourceMark rm(current);
552 ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, nullptr);
553 if (pdata != nullptr && pdata->is_BitData()) {
554 BitData* bit_data = (BitData*) pdata;
555 bit_data->set_exception_seen();
556 }
557 }
558 #endif
559
560 // notify JVMTI of an exception throw; JVMTI will detect if this is a first
561 // time throw or a stack unwinding throw and accordingly notify the debugger
562 if (JvmtiExport::can_post_on_exceptions()) {
563 JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
564 }
565
566 address continuation = nullptr;
567 address handler_pc = nullptr;
568 if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
569 // Forward exception to callee (leaving bci/bcp untouched) because (a) no
570 // handler in this method, or (b) after a stack overflow there is not yet
571 // enough stack space available to reprotect the stack.
572 continuation = Interpreter::remove_activation_entry();
573 #if COMPILER2_OR_JVMCI
574 // Count this for compilation purposes
575 h_method->interpreter_throwout_increment(THREAD);
576 #endif
577 } else {
578 // handler in this method => change bci/bcp to handler bci/bcp and continue there
579 handler_pc = h_method->code_base() + handler_bci;
580 #ifndef ZERO
581 set_bcp_and_mdp(handler_pc, current);
582 continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
583 #else
584 continuation = (address)(intptr_t) handler_bci;
585 #endif
586 }
587
588 // notify debugger of an exception catch
589 // (this is good for exceptions caught in native methods as well)
590 if (JvmtiExport::can_post_on_exceptions()) {
591 JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
592 }
593
594 current->set_vm_result(h_exception());
595 return continuation;
596 JRT_END
597
598
599 JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
600 assert(current->has_pending_exception(), "must only be called if there's an exception pending");
601 // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
602 JRT_END
603
604
605 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
606 THROW(vmSymbols::java_lang_AbstractMethodError());
607 JRT_END
608
609 // This method is called from the "abstract_entry" of the interpreter.
610 // At that point, the arguments have already been removed from the stack
611 // and therefore we don't have the receiver object at our fingertips. (Though,
612 // on some platforms the receiver still resides in a register...). Thus,
613 // we have no choice but print an error message not containing the receiver
614 // type.
615 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
616 Method* missingMethod))
617 ResourceMark rm(current);
618 assert(missingMethod != nullptr, "sanity");
619 methodHandle m(current, missingMethod);
620 LinkResolver::throw_abstract_method_error(m, THREAD);
621 JRT_END
622
623 JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
624 Klass* recvKlass,
625 Method* missingMethod))
626 ResourceMark rm(current);
627 methodHandle mh = methodHandle(current, missingMethod);
628 LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
629 JRT_END
630
631
632 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
633 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
634 JRT_END
635
636 JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
637 Klass* recvKlass,
638 Klass* interfaceKlass))
639 ResourceMark rm(current);
640 char buf[1000];
641 buf[0] = '\0';
642 jio_snprintf(buf, sizeof(buf),
643 "Class %s does not implement the requested interface %s",
644 recvKlass ? recvKlass->external_name() : "nullptr",
645 interfaceKlass ? interfaceKlass->external_name() : "nullptr");
646 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
647 JRT_END
648
649 JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
650 THROW(vmSymbols::java_lang_NullPointerException());
651 JRT_END
652
653 //------------------------------------------------------------------------------------------------------------------------
654 // Fields
655 //
656
657 void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
658 // resolve field
659 fieldDescriptor info;
660 LastFrameAccessor last_frame(current);
661 constantPoolHandle pool(current, last_frame.method()->constants());
662 methodHandle m(current, last_frame.method());
663 bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_nofast_putfield ||
664 bytecode == Bytecodes::_putstatic);
665 bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
666
667 {
668 JvmtiHideSingleStepping jhss(current);
669 JavaThread* THREAD = current; // For exception macros.
670 LinkResolver::resolve_field_access(info, pool, last_frame.get_index_u2_cpcache(bytecode),
671 m, bytecode, CHECK);
672 } // end JvmtiHideSingleStepping
673
674 // check if link resolution caused cpCache to be updated
675 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
676 if (cp_cache_entry->is_resolved(bytecode)) return;
677
678 // compute auxiliary field attributes
679 TosState state = as_TosState(info.field_type());
680
681 // Resolution of put instructions on final fields is delayed. That is required so that
682 // exceptions are thrown at the correct place (when the instruction is actually invoked).
683 // If we do not resolve an instruction in the current pass, leaving the put_code
684 // set to zero will cause the next put instruction to the same field to reresolve.
685
686 // Resolution of put instructions to final instance fields with invalid updates (i.e.,
687 // to final instance fields with updates originating from a method different than <init>)
688 // is inhibited. A putfield instruction targeting an instance final field must throw
689 // an IllegalAccessError if the instruction is not in an instance
690 // initializer method <init>. If resolution were not inhibited, a putfield
691 // in an initializer method could be resolved in the initializer. Subsequent
692 // putfield instructions to the same field would then use cached information.
693 // As a result, those instructions would not pass through the VM. That is,
694 // checks in resolve_field_access() would not be executed for those instructions
695 // and the required IllegalAccessError would not be thrown.
696 //
697 // Also, we need to delay resolving getstatic and putstatic instructions until the
698 // class is initialized. This is required so that access to the static
699 // field will call the initialization function every time until the class
700 // is completely initialized ala. in 2.17.5 in JVM Specification.
701 InstanceKlass* klass = info.field_holder();
702 bool uninitialized_static = is_static && !klass->is_initialized();
703 bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
704 info.has_initialized_final_update();
705 assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
706
707 Bytecodes::Code get_code = (Bytecodes::Code)0;
708 Bytecodes::Code put_code = (Bytecodes::Code)0;
709 if (!uninitialized_static) {
710 get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
711 if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
712 put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
713 }
714 }
715
716 cp_cache_entry->set_field(
717 get_code,
718 put_code,
719 info.field_holder(),
720 info.index(),
721 info.offset(),
722 state,
723 info.access_flags().is_final(),
724 info.access_flags().is_volatile()
725 );
726 }
727
728
729 //------------------------------------------------------------------------------------------------------------------------
730 // Synchronization
731 //
732 // The interpreter's synchronization code is factored out so that it can
733 // be shared by method invocation and synchronized blocks.
734 //%note synchronization_3
735
736 //%note monitor_1
737 JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
738 #ifdef ASSERT
739 current->last_frame().interpreter_frame_verify_monitor(elem);
740 #endif
741 Handle h_obj(current, elem->obj());
742 assert(Universe::heap()->is_in_or_null(h_obj()),
743 "must be null or an object");
744 ObjectSynchronizer::enter(h_obj, elem->lock(), current);
745 assert(Universe::heap()->is_in_or_null(elem->obj()),
746 "must be null or an object");
747 #ifdef ASSERT
748 current->last_frame().interpreter_frame_verify_monitor(elem);
749 #endif
750 JRT_END
751
752
753 JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
754 oop obj = elem->obj();
755 assert(Universe::heap()->is_in(obj), "must be an object");
756 // The object could become unlocked through a JNI call, which we have no other checks for.
757 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
758 if (obj->is_unlocked()) {
759 if (CheckJNICalls) {
760 fatal("Object has been unlocked by JNI");
761 }
762 return;
763 }
764 ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
765 // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
766 // again at method exit or in the case of an exception.
767 elem->set_obj(nullptr);
768 JRT_END
769
770
771 JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
772 THROW(vmSymbols::java_lang_IllegalMonitorStateException());
773 JRT_END
774
775
776 JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
777 // Returns an illegal exception to install into the current thread. The
778 // pending_exception flag is cleared so normal exception handling does not
779 // trigger. Any current installed exception will be overwritten. This
780 // method will be called during an exception unwind.
781
782 assert(!HAS_PENDING_EXCEPTION, "no pending exception");
783 Handle exception(current, current->vm_result());
784 assert(exception() != nullptr, "vm result should be set");
785 current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
786 exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
787 current->set_vm_result(exception());
788 JRT_END
789
790
791 //------------------------------------------------------------------------------------------------------------------------
792 // Invokes
793
794 JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
795 return method->orig_bytecode_at(method->bci_from(bcp));
796 JRT_END
797
798 JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
799 method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
800 JRT_END
801
802 JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
803 JvmtiExport::post_raw_breakpoint(current, method, bcp);
804 JRT_END
805
806 void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
807 LastFrameAccessor last_frame(current);
808 // extract receiver from the outgoing argument list if necessary
809 Handle receiver(current, nullptr);
810 if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
811 bytecode == Bytecodes::_invokespecial) {
812 ResourceMark rm(current);
813 methodHandle m (current, last_frame.method());
814 Bytecode_invoke call(m, last_frame.bci());
815 Symbol* signature = call.signature();
816 receiver = Handle(current, last_frame.callee_receiver(signature));
817
818 assert(Universe::heap()->is_in_or_null(receiver()),
819 "sanity check");
820 assert(receiver.is_null() ||
821 !Universe::heap()->is_in(receiver->klass()),
822 "sanity check");
823 }
824
825 // resolve method
826 CallInfo info;
827 constantPoolHandle pool(current, last_frame.method()->constants());
828
829 methodHandle resolved_method;
830
831 {
832 JvmtiHideSingleStepping jhss(current);
833 JavaThread* THREAD = current; // For exception macros.
834 LinkResolver::resolve_invoke(info, receiver, pool,
835 last_frame.get_index_u2_cpcache(bytecode), bytecode,
836 THREAD);
837
838 if (HAS_PENDING_EXCEPTION) {
839 if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
840 // Preserve the original exception across the call to note_trap()
841 PreserveExceptionMark pm(current);
842 // Recording the trap will help the compiler to potentially recognize this exception as "hot"
843 note_trap(current, Deoptimization::Reason_null_check);
844 }
845 return;
846 }
847
848 if (JvmtiExport::can_hotswap_or_post_breakpoint() && info.resolved_method()->is_old()) {
849 resolved_method = methodHandle(current, info.resolved_method()->get_new_method());
850 } else {
851 resolved_method = methodHandle(current, info.resolved_method());
852 }
853 } // end JvmtiHideSingleStepping
854
855 // check if link resolution caused cpCache to be updated
856 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
857 if (cp_cache_entry->is_resolved(bytecode)) return;
858
859 #ifdef ASSERT
860 if (bytecode == Bytecodes::_invokeinterface) {
861 if (resolved_method->method_holder() == vmClasses::Object_klass()) {
862 // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
863 // (see also CallInfo::set_interface for details)
864 assert(info.call_kind() == CallInfo::vtable_call ||
865 info.call_kind() == CallInfo::direct_call, "");
866 assert(resolved_method->is_final() || info.has_vtable_index(),
867 "should have been set already");
868 } else if (!resolved_method->has_itable_index()) {
869 // Resolved something like CharSequence.toString. Use vtable not itable.
870 assert(info.call_kind() != CallInfo::itable_call, "");
871 } else {
872 // Setup itable entry
873 assert(info.call_kind() == CallInfo::itable_call, "");
874 int index = resolved_method->itable_index();
875 assert(info.itable_index() == index, "");
876 }
877 } else if (bytecode == Bytecodes::_invokespecial) {
878 assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
879 } else {
880 assert(info.call_kind() == CallInfo::direct_call ||
881 info.call_kind() == CallInfo::vtable_call, "");
882 }
883 #endif
884 // Get sender and only set cpCache entry to resolved if it is not an
885 // interface. The receiver for invokespecial calls within interface
886 // methods must be checked for every call.
887 InstanceKlass* sender = pool->pool_holder();
888
889 switch (info.call_kind()) {
890 case CallInfo::direct_call:
891 cp_cache_entry->set_direct_call(
892 bytecode,
893 resolved_method,
894 sender->is_interface());
895 break;
896 case CallInfo::vtable_call:
897 cp_cache_entry->set_vtable_call(
898 bytecode,
899 resolved_method,
900 info.vtable_index());
901 break;
902 case CallInfo::itable_call:
903 cp_cache_entry->set_itable_call(
904 bytecode,
905 info.resolved_klass(),
906 resolved_method,
907 info.itable_index());
908 break;
909 default: ShouldNotReachHere();
910 }
911 }
912
913
914 // First time execution: Resolve symbols, create a permanent MethodType object.
915 void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
916 const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
917 LastFrameAccessor last_frame(current);
918
919 // resolve method
920 CallInfo info;
921 constantPoolHandle pool(current, last_frame.method()->constants());
922 {
923 JvmtiHideSingleStepping jhss(current);
924 JavaThread* THREAD = current; // For exception macros.
925 LinkResolver::resolve_invoke(info, Handle(), pool,
926 last_frame.get_index_u2_cpcache(bytecode), bytecode,
927 CHECK);
928 } // end JvmtiHideSingleStepping
929
930 ConstantPoolCacheEntry* cp_cache_entry = last_frame.cache_entry();
931 cp_cache_entry->set_method_handle(pool, info);
932 }
933
934 // First time execution: Resolve symbols, create a permanent CallSite object.
935 void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
936 LastFrameAccessor last_frame(current);
937 const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
938
939 // resolve method
940 CallInfo info;
941 constantPoolHandle pool(current, last_frame.method()->constants());
942 int index = last_frame.get_index_u4(bytecode);
943 {
944 JvmtiHideSingleStepping jhss(current);
945 JavaThread* THREAD = current; // For exception macros.
946 LinkResolver::resolve_invoke(info, Handle(), pool,
947 index, bytecode, CHECK);
948 } // end JvmtiHideSingleStepping
949
950 ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
951 cp_cache_entry->set_dynamic_call(pool, info);
952 }
953
954 // This function is the interface to the assembly code. It returns the resolved
955 // cpCache entry. This doesn't safepoint, but the helper routines safepoint.
956 // This function will check for redefinition!
957 JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
958 switch (bytecode) {
959 case Bytecodes::_getstatic:
960 case Bytecodes::_putstatic:
961 case Bytecodes::_getfield:
962 case Bytecodes::_putfield:
963 resolve_get_put(current, bytecode);
964 break;
965 case Bytecodes::_invokevirtual:
966 case Bytecodes::_invokespecial:
967 case Bytecodes::_invokestatic:
968 case Bytecodes::_invokeinterface:
969 resolve_invoke(current, bytecode);
970 break;
971 case Bytecodes::_invokehandle:
972 resolve_invokehandle(current);
973 break;
974 case Bytecodes::_invokedynamic:
975 resolve_invokedynamic(current);
976 break;
977 default:
978 fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
979 break;
980 }
981 }
982 JRT_END
983
984 //------------------------------------------------------------------------------------------------------------------------
985 // Miscellaneous
986
987
988 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
989 // Enable WXWrite: the function is called directly by interpreter.
990 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
991
992 // frequency_counter_overflow_inner can throw async exception.
993 nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
994 assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
995 if (branch_bcp != nullptr && nm != nullptr) {
996 // This was a successful request for an OSR nmethod. Because
997 // frequency_counter_overflow_inner ends with a safepoint check,
998 // nm could have been unloaded so look it up again. It's unsafe
999 // to examine nm directly since it might have been freed and used
1000 // for something else.
1001 LastFrameAccessor last_frame(current);
1002 Method* method = last_frame.method();
1003 int bci = method->bci_from(last_frame.bcp());
1004 nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1005 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1006 if (nm != nullptr && bs_nm != nullptr) {
1007 // in case the transition passed a safepoint we need to barrier this again
1008 if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1009 nm = nullptr;
1010 }
1011 }
1012 }
1013 if (nm != nullptr && current->is_interp_only_mode()) {
1014 // Normally we never get an nm if is_interp_only_mode() is true, because
1015 // policy()->event has a check for this and won't compile the method when
1016 // true. However, it's possible for is_interp_only_mode() to become true
1017 // during the compilation. We don't want to return the nm in that case
1018 // because we want to continue to execute interpreted.
1019 nm = nullptr;
1020 }
1021 #ifndef PRODUCT
1022 if (TraceOnStackReplacement) {
1023 if (nm != nullptr) {
1024 tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1025 nm->print();
1026 }
1027 }
1028 #endif
1029 return nm;
1030 }
1031
1032 JRT_ENTRY(nmethod*,
1033 InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1034 // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1035 // flag, in case this method triggers classloading which will call into Java.
1036 UnlockFlagSaver fs(current);
1037
1038 LastFrameAccessor last_frame(current);
1039 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1040 methodHandle method(current, last_frame.method());
1041 const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1042 const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1043
1044 nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1045
1046 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1047 if (osr_nm != nullptr && bs_nm != nullptr) {
1048 if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1049 osr_nm = nullptr;
1050 }
1051 }
1052 return osr_nm;
1053 JRT_END
1054
1055 JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1056 assert(ProfileInterpreter, "must be profiling interpreter");
1057 int bci = method->bci_from(cur_bcp);
1058 MethodData* mdo = method->method_data();
1059 if (mdo == nullptr) return 0;
1060 return mdo->bci_to_di(bci);
1061 JRT_END
1062
1063 #ifdef ASSERT
1064 JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1065 assert(ProfileInterpreter, "must be profiling interpreter");
1066
1067 MethodData* mdo = method->method_data();
1068 assert(mdo != nullptr, "must not be null");
1069
1070 int bci = method->bci_from(bcp);
1071
1072 address mdp2 = mdo->bci_to_dp(bci);
1073 if (mdp != mdp2) {
1074 ResourceMark rm;
1075 tty->print_cr("FAILED verify : actual mdp %p expected mdp %p @ bci %d", mdp, mdp2, bci);
1076 int current_di = mdo->dp_to_di(mdp);
1077 int expected_di = mdo->dp_to_di(mdp2);
1078 tty->print_cr(" actual di %d expected di %d", current_di, expected_di);
1079 int expected_approx_bci = mdo->data_at(expected_di)->bci();
1080 int approx_bci = -1;
1081 if (current_di >= 0) {
1082 approx_bci = mdo->data_at(current_di)->bci();
1083 }
1084 tty->print_cr(" actual bci is %d expected bci %d", approx_bci, expected_approx_bci);
1085 mdo->print_on(tty);
1086 method->print_codes();
1087 }
1088 assert(mdp == mdp2, "wrong mdp");
1089 JRT_END
1090 #endif // ASSERT
1091
1092 JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1093 assert(ProfileInterpreter, "must be profiling interpreter");
1094 ResourceMark rm(current);
1095 LastFrameAccessor last_frame(current);
1096 assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1097 MethodData* h_mdo = last_frame.method()->method_data();
1098
1099 // Grab a lock to ensure atomic access to setting the return bci and
1100 // the displacement. This can block and GC, invalidating all naked oops.
1101 MutexLocker ml(RetData_lock);
1102
1103 // ProfileData is essentially a wrapper around a derived oop, so we
1104 // need to take the lock before making any ProfileData structures.
1105 ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1106 guarantee(data != nullptr, "profile data must be valid");
1107 RetData* rdata = data->as_RetData();
1108 address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1109 last_frame.set_mdp(new_mdp);
1110 JRT_END
1111
1112 JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1113 return Method::build_method_counters(current, m);
1114 JRT_END
1115
1116
1117 JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1118 // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1119 // stack traversal automatically takes care of preserving arguments for invoke, so
1120 // this is no longer needed.
1121
1122 // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1123 // if this is called during a safepoint
1124
1125 if (JvmtiExport::should_post_single_step()) {
1126 // This function is called by the interpreter when single stepping. Such single
1127 // stepping could unwind a frame. Then, it is important that we process any frames
1128 // that we might return into.
1129 StackWatermarkSet::before_unwind(current);
1130
1131 // We are called during regular safepoints and when the VM is
1132 // single stepping. If any thread is marked for single stepping,
1133 // then we may have JVMTI work to do.
1134 LastFrameAccessor last_frame(current);
1135 JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1136 }
1137 JRT_END
1138
1139 JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1140 assert(current == JavaThread::current(), "pre-condition");
1141 // This function is called by the interpreter when the return poll found a reason
1142 // to call the VM. The reason could be that we are returning into a not yet safe
1143 // to access frame. We handle that below.
1144 // Note that this path does not check for single stepping, because we do not want
1145 // to single step when unwinding frames for an exception being thrown. Instead,
1146 // such single stepping code will use the safepoint table, which will use the
1147 // InterpreterRuntime::at_safepoint callback.
1148 StackWatermarkSet::before_unwind(current);
1149 JRT_END
1150
1151 JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1152 ConstantPoolCacheEntry *cp_entry))
1153
1154 // check the access_flags for the field in the klass
1155
1156 InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());
1157 int index = cp_entry->field_index();
1158 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1159
1160 bool is_static = (obj == nullptr);
1161 HandleMark hm(current);
1162
1163 Handle h_obj;
1164 if (!is_static) {
1165 // non-static field accessors have an object, but we need a handle
1166 h_obj = Handle(current, obj);
1167 }
1168 InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());
1169 jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);
1170 LastFrameAccessor last_frame(current);
1171 JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), cp_entry_f1, h_obj, fid);
1172 JRT_END
1173
1174 JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1175 ConstantPoolCacheEntry *cp_entry, jvalue *value))
1176
1177 Klass* k = cp_entry->f1_as_klass();
1178
1179 // check the access_flags for the field in the klass
1180 InstanceKlass* ik = InstanceKlass::cast(k);
1181 int index = cp_entry->field_index();
1182 // bail out if field modifications are not watched
1183 if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1184
1185 char sig_type = '\0';
1186
1187 switch(cp_entry->flag_state()) {
1188 case btos: sig_type = JVM_SIGNATURE_BYTE; break;
1189 case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1190 case ctos: sig_type = JVM_SIGNATURE_CHAR; break;
1191 case stos: sig_type = JVM_SIGNATURE_SHORT; break;
1192 case itos: sig_type = JVM_SIGNATURE_INT; break;
1193 case ftos: sig_type = JVM_SIGNATURE_FLOAT; break;
1194 case atos: sig_type = JVM_SIGNATURE_CLASS; break;
1195 case ltos: sig_type = JVM_SIGNATURE_LONG; break;
1196 case dtos: sig_type = JVM_SIGNATURE_DOUBLE; break;
1197 default: ShouldNotReachHere(); return;
1198 }
1199 bool is_static = (obj == nullptr);
1200
1201 HandleMark hm(current);
1202 jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);
1203 jvalue fvalue;
1204 #ifdef _LP64
1205 fvalue = *value;
1206 #else
1207 // Long/double values are stored unaligned and also noncontiguously with
1208 // tagged stacks. We can't just do a simple assignment even in the non-
1209 // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1210 // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1211 // We assume that the two halves of longs/doubles are stored in interpreter
1212 // stack slots in platform-endian order.
1213 jlong_accessor u;
1214 jint* newval = (jint*)value;
1215 u.words[0] = newval[0];
1216 u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1217 fvalue.j = u.long_value;
1218 #endif // _LP64
1219
1220 Handle h_obj;
1221 if (!is_static) {
1222 // non-static field accessors have an object, but we need a handle
1223 h_obj = Handle(current, obj);
1224 }
1225
1226 LastFrameAccessor last_frame(current);
1227 JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1228 fid, sig_type, &fvalue);
1229 JRT_END
1230
1231 JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1232 LastFrameAccessor last_frame(current);
1233 JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1234 JRT_END
1235
1236
1237 // This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1238 // before transitioning to VM, and restore it after transitioning back
1239 // to Java. The return oop at the top-of-stack, is not walked by the GC.
1240 JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1241 LastFrameAccessor last_frame(current);
1242 JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1243 JRT_END
1244
1245 JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1246 {
1247 return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1248 }
1249 JRT_END
1250
1251
1252 // Implementation of SignatureHandlerLibrary
1253
1254 #ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1255 // Dummy definition (else normalization method is defined in CPU
1256 // dependent code)
1257 uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1258 return fingerprint;
1259 }
1260 #endif
1261
1262 address SignatureHandlerLibrary::set_handler_blob() {
1263 BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1264 if (handler_blob == nullptr) {
1265 return nullptr;
1266 }
1267 address handler = handler_blob->code_begin();
1268 _handler_blob = handler_blob;
1269 _handler = handler;
1270 return handler;
1271 }
1272
1273 void SignatureHandlerLibrary::initialize() {
1274 if (_fingerprints != nullptr) {
1275 return;
1276 }
1277 if (set_handler_blob() == nullptr) {
1278 vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1279 }
1280
1281 BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1282 SignatureHandlerLibrary::buffer_size);
1283 _buffer = bb->code_begin();
1284
1285 _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1286 _handlers = new (mtCode) GrowableArray<address>(32, mtCode);
1287 }
1288
1289 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1290 address handler = _handler;
1291 int insts_size = buffer->pure_insts_size();
1292 if (handler + insts_size > _handler_blob->code_end()) {
1293 // get a new handler blob
1294 handler = set_handler_blob();
1295 }
1296 if (handler != nullptr) {
1297 memcpy(handler, buffer->insts_begin(), insts_size);
1298 pd_set_handler(handler);
1299 ICache::invalidate_range(handler, insts_size);
1300 _handler = handler + insts_size;
1301 }
1302 return handler;
1303 }
1304
1305 void SignatureHandlerLibrary::add(const methodHandle& method) {
1306 if (method->signature_handler() == nullptr) {
1307 // use slow signature handler if we can't do better
1308 int handler_index = -1;
1309 // check if we can use customized (fast) signature handler
1310 if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1311 // use customized signature handler
1312 MutexLocker mu(SignatureHandlerLibrary_lock);
1313 // make sure data structure is initialized
1314 initialize();
1315 // lookup method signature's fingerprint
1316 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1317 // allow CPU dependent code to optimize the fingerprints for the fast handler
1318 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1319 handler_index = _fingerprints->find(fingerprint);
1320 // create handler if necessary
1321 if (handler_index < 0) {
1322 ResourceMark rm;
1323 ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1324 CodeBuffer buffer((address)(_buffer + align_offset),
1325 SignatureHandlerLibrary::buffer_size - align_offset);
1326 InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1327 // copy into code heap
1328 address handler = set_handler(&buffer);
1329 if (handler == nullptr) {
1330 // use slow signature handler (without memorizing it in the fingerprints)
1331 } else {
1332 // debugging support
1333 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1334 ttyLocker ttyl;
1335 tty->cr();
1336 tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1337 _handlers->length(),
1338 (method->is_static() ? "static" : "receiver"),
1339 method->name_and_sig_as_C_string(),
1340 fingerprint,
1341 buffer.insts_size());
1342 if (buffer.insts_size() > 0) {
1343 Disassembler::decode(handler, handler + buffer.insts_size(), tty
1344 NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1345 }
1346 #ifndef PRODUCT
1347 address rh_begin = Interpreter::result_handler(method()->result_type());
1348 if (CodeCache::contains(rh_begin)) {
1349 // else it might be special platform dependent values
1350 tty->print_cr(" --- associated result handler ---");
1351 address rh_end = rh_begin;
1352 while (*(int*)rh_end != 0) {
1353 rh_end += sizeof(int);
1354 }
1355 Disassembler::decode(rh_begin, rh_end);
1356 } else {
1357 tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1358 }
1359 #endif
1360 }
1361 // add handler to library
1362 _fingerprints->append(fingerprint);
1363 _handlers->append(handler);
1364 // set handler index
1365 assert(_fingerprints->length() == _handlers->length(), "sanity check");
1366 handler_index = _fingerprints->length() - 1;
1367 }
1368 }
1369 // Set handler under SignatureHandlerLibrary_lock
1370 if (handler_index < 0) {
1371 // use generic signature handler
1372 method->set_signature_handler(Interpreter::slow_signature_handler());
1373 } else {
1374 // set handler
1375 method->set_signature_handler(_handlers->at(handler_index));
1376 }
1377 } else {
1378 DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1379 // use generic signature handler
1380 method->set_signature_handler(Interpreter::slow_signature_handler());
1381 }
1382 }
1383 #ifdef ASSERT
1384 int handler_index = -1;
1385 int fingerprint_index = -2;
1386 {
1387 // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1388 // in any way if accessed from multiple threads. To avoid races with another
1389 // thread which may change the arrays in the above, mutex protected block, we
1390 // have to protect this read access here with the same mutex as well!
1391 MutexLocker mu(SignatureHandlerLibrary_lock);
1392 if (_handlers != nullptr) {
1393 handler_index = _handlers->find(method->signature_handler());
1394 uint64_t fingerprint = Fingerprinter(method).fingerprint();
1395 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1396 fingerprint_index = _fingerprints->find(fingerprint);
1397 }
1398 }
1399 assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1400 handler_index == fingerprint_index, "sanity check");
1401 #endif // ASSERT
1402 }
1403
1404 void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1405 int handler_index = -1;
1406 // use customized signature handler
1407 MutexLocker mu(SignatureHandlerLibrary_lock);
1408 // make sure data structure is initialized
1409 initialize();
1410 fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1411 handler_index = _fingerprints->find(fingerprint);
1412 // create handler if necessary
1413 if (handler_index < 0) {
1414 if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1415 tty->cr();
1416 tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1417 _handlers->length(),
1418 p2i(handler),
1419 fingerprint);
1420 }
1421 _fingerprints->append(fingerprint);
1422 _handlers->append(handler);
1423 } else {
1424 if (PrintSignatureHandlers) {
1425 tty->cr();
1426 tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1427 _handlers->length(),
1428 fingerprint,
1429 p2i(_handlers->at(handler_index)),
1430 p2i(handler));
1431 }
1432 }
1433 }
1434
1435
1436 BufferBlob* SignatureHandlerLibrary::_handler_blob = nullptr;
1437 address SignatureHandlerLibrary::_handler = nullptr;
1438 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1439 GrowableArray<address>* SignatureHandlerLibrary::_handlers = nullptr;
1440 address SignatureHandlerLibrary::_buffer = nullptr;
1441
1442
1443 JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1444 methodHandle m(current, method);
1445 assert(m->is_native(), "sanity check");
1446 // lookup native function entry point if it doesn't exist
1447 if (!m->has_native_function()) {
1448 NativeLookup::lookup(m, CHECK);
1449 }
1450 // make sure signature handler is installed
1451 SignatureHandlerLibrary::add(m);
1452 // The interpreter entry point checks the signature handler first,
1453 // before trying to fetch the native entry point and klass mirror.
1454 // We must set the signature handler last, so that multiple processors
1455 // preparing the same method will be sure to see non-null entry & mirror.
1456 JRT_END
1457
1458 #if defined(IA32) || defined(AMD64) || defined(ARM)
1459 JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1460 assert(current == JavaThread::current(), "pre-condition");
1461 if (src_address == dest_address) {
1462 return;
1463 }
1464 ResourceMark rm;
1465 LastFrameAccessor last_frame(current);
1466 assert(last_frame.is_interpreted_frame(), "");
1467 jint bci = last_frame.bci();
1468 methodHandle mh(current, last_frame.method());
1469 Bytecode_invoke invoke(mh, bci);
1470 ArgumentSizeComputer asc(invoke.signature());
1471 int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1472 Copy::conjoint_jbytes(src_address, dest_address,
1473 size_of_arguments * Interpreter::stackElementSize);
1474 JRT_END
1475 #endif
1476
1477 #if INCLUDE_JVMTI
1478 // This is a support of the JVMTI PopFrame interface.
1479 // Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1480 // and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1481 // The member_name argument is a saved reference (in local#0) to the member_name.
1482 // For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1483 // FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1484 JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1485 Method* method, address bcp))
1486 Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1487 if (code != Bytecodes::_invokestatic) {
1488 return;
1489 }
1490 ConstantPool* cpool = method->constants();
1491 int cp_index = Bytes::get_native_u2(bcp + 1) + ConstantPool::CPCACHE_INDEX_TAG;
1492 Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index));
1493 Symbol* mname = cpool->name_ref_at(cp_index);
1494
1495 if (MethodHandles::has_member_arg(cname, mname)) {
1496 oop member_name_oop = cast_to_oop(member_name);
1497 if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1498 // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1499 member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1500 }
1501 current->set_vm_result(member_name_oop);
1502 } else {
1503 current->set_vm_result(nullptr);
1504 }
1505 JRT_END
1506 #endif // INCLUDE_JVMTI
1507
1508 #ifndef PRODUCT
1509 // This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1510 // call this, which changes rsp and makes the interpreter's expression stack not walkable.
1511 // The generated code still uses call_VM because that will set up the frame pointer for
1512 // bcp and method.
1513 JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1514 assert(current == JavaThread::current(), "pre-condition");
1515 LastFrameAccessor last_frame(current);
1516 assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1517 methodHandle mh(current, last_frame.method());
1518 BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1519 return preserve_this_value;
1520 JRT_END
1521 #endif // !PRODUCT