1 /*
2 * Copyright (c) 1999, 2019, 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 "asm/codeBuffer.hpp"
27 #include "c1/c1_CodeStubs.hpp"
28 #include "c1/c1_Defs.hpp"
29 #include "c1/c1_FrameMap.hpp"
30 #include "c1/c1_LIRAssembler.hpp"
31 #include "c1/c1_MacroAssembler.hpp"
32 #include "c1/c1_Runtime1.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "code/codeBlob.hpp"
36 #include "code/compiledIC.hpp"
37 #include "code/pcDesc.hpp"
38 #include "code/scopeDesc.hpp"
39 #include "code/vtableStubs.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "gc/shared/barrierSet.hpp"
42 #include "gc/shared/c1/barrierSetC1.hpp"
43 #include "gc/shared/collectedHeap.hpp"
44 #include "interpreter/bytecode.hpp"
45 #include "interpreter/interpreter.hpp"
46 #include "jfr/support/jfrIntrinsics.hpp"
47 #include "logging/log.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "oops/access.inline.hpp"
52 #include "oops/objArrayOop.inline.hpp"
53 #include "oops/objArrayKlass.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/valueArrayKlass.hpp"
56 #include "oops/valueArrayOop.inline.hpp"
57 #include "runtime/atomic.hpp"
58 #include "runtime/biasedLocking.hpp"
59 #include "runtime/compilationPolicy.hpp"
60 #include "runtime/fieldDescriptor.inline.hpp"
61 #include "runtime/frame.inline.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/interfaceSupport.inline.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/sharedRuntime.hpp"
66 #include "runtime/threadCritical.hpp"
67 #include "runtime/vframe.inline.hpp"
68 #include "runtime/vframeArray.hpp"
69 #include "runtime/vm_version.hpp"
70 #include "utilities/copy.hpp"
71 #include "utilities/events.hpp"
72
73
74 // Implementation of StubAssembler
75
76 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) {
77 _name = name;
78 _must_gc_arguments = false;
79 _frame_size = no_frame_size;
80 _num_rt_args = 0;
81 _stub_id = stub_id;
82 }
83
84
85 void StubAssembler::set_info(const char* name, bool must_gc_arguments) {
86 _name = name;
87 _must_gc_arguments = must_gc_arguments;
88 }
89
90
91 void StubAssembler::set_frame_size(int size) {
92 if (_frame_size == no_frame_size) {
93 _frame_size = size;
94 }
95 assert(_frame_size == size, "can't change the frame size");
96 }
97
98
99 void StubAssembler::set_num_rt_args(int args) {
100 if (_num_rt_args == 0) {
101 _num_rt_args = args;
102 }
103 assert(_num_rt_args == args, "can't change the number of args");
104 }
105
106 // Implementation of Runtime1
107
108 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids];
109 const char *Runtime1::_blob_names[] = {
110 RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME)
111 };
112
113 #ifndef PRODUCT
114 // statistics
115 int Runtime1::_generic_arraycopy_cnt = 0;
116 int Runtime1::_generic_arraycopystub_cnt = 0;
117 int Runtime1::_arraycopy_slowcase_cnt = 0;
118 int Runtime1::_arraycopy_checkcast_cnt = 0;
119 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0;
120 int Runtime1::_new_type_array_slowcase_cnt = 0;
121 int Runtime1::_new_object_array_slowcase_cnt = 0;
122 int Runtime1::_new_instance_slowcase_cnt = 0;
123 int Runtime1::_new_multi_array_slowcase_cnt = 0;
124 int Runtime1::_load_flattened_array_slowcase_cnt = 0;
125 int Runtime1::_store_flattened_array_slowcase_cnt = 0;
126 int Runtime1::_monitorenter_slowcase_cnt = 0;
127 int Runtime1::_monitorexit_slowcase_cnt = 0;
128 int Runtime1::_patch_code_slowcase_cnt = 0;
129 int Runtime1::_throw_range_check_exception_count = 0;
130 int Runtime1::_throw_index_exception_count = 0;
131 int Runtime1::_throw_div0_exception_count = 0;
132 int Runtime1::_throw_null_pointer_exception_count = 0;
133 int Runtime1::_throw_class_cast_exception_count = 0;
134 int Runtime1::_throw_incompatible_class_change_error_count = 0;
135 int Runtime1::_throw_illegal_monitor_state_exception_count = 0;
136 int Runtime1::_throw_array_store_exception_count = 0;
137 int Runtime1::_throw_count = 0;
138
139 static int _byte_arraycopy_stub_cnt = 0;
140 static int _short_arraycopy_stub_cnt = 0;
141 static int _int_arraycopy_stub_cnt = 0;
142 static int _long_arraycopy_stub_cnt = 0;
143 static int _oop_arraycopy_stub_cnt = 0;
144
145 address Runtime1::arraycopy_count_address(BasicType type) {
146 switch (type) {
147 case T_BOOLEAN:
148 case T_BYTE: return (address)&_byte_arraycopy_stub_cnt;
149 case T_CHAR:
150 case T_SHORT: return (address)&_short_arraycopy_stub_cnt;
151 case T_FLOAT:
152 case T_INT: return (address)&_int_arraycopy_stub_cnt;
153 case T_DOUBLE:
154 case T_LONG: return (address)&_long_arraycopy_stub_cnt;
155 case T_ARRAY:
156 case T_OBJECT: return (address)&_oop_arraycopy_stub_cnt;
157 default:
158 ShouldNotReachHere();
159 return NULL;
160 }
161 }
162
163
164 #endif
165
166 // Simple helper to see if the caller of a runtime stub which
167 // entered the VM has been deoptimized
168
169 static bool caller_is_deopted() {
170 JavaThread* thread = JavaThread::current();
171 RegisterMap reg_map(thread, false);
172 frame runtime_frame = thread->last_frame();
173 frame caller_frame = runtime_frame.sender(®_map);
174 assert(caller_frame.is_compiled_frame(), "must be compiled");
175 return caller_frame.is_deoptimized_frame();
176 }
177
178 // Stress deoptimization
179 static void deopt_caller() {
180 if ( !caller_is_deopted()) {
181 JavaThread* thread = JavaThread::current();
182 RegisterMap reg_map(thread, false);
183 frame runtime_frame = thread->last_frame();
184 frame caller_frame = runtime_frame.sender(®_map);
185 Deoptimization::deoptimize_frame(thread, caller_frame.id());
186 assert(caller_is_deopted(), "Must be deoptimized");
187 }
188 }
189
190 class StubIDStubAssemblerCodeGenClosure: public StubAssemblerCodeGenClosure {
191 private:
192 Runtime1::StubID _id;
193 public:
194 StubIDStubAssemblerCodeGenClosure(Runtime1::StubID id) : _id(id) {}
195 virtual OopMapSet* generate_code(StubAssembler* sasm) {
196 return Runtime1::generate_code_for(_id, sasm);
197 }
198 };
199
200 CodeBlob* Runtime1::generate_blob(BufferBlob* buffer_blob, int stub_id, const char* name, bool expect_oop_map, StubAssemblerCodeGenClosure* cl) {
201 ResourceMark rm;
202 // create code buffer for code storage
203 CodeBuffer code(buffer_blob);
204
205 OopMapSet* oop_maps;
206 int frame_size;
207 bool must_gc_arguments;
208
209 Compilation::setup_code_buffer(&code, 0);
210
211 // create assembler for code generation
212 StubAssembler* sasm = new StubAssembler(&code, name, stub_id);
213 // generate code for runtime stub
214 oop_maps = cl->generate_code(sasm);
215 assert(oop_maps == NULL || sasm->frame_size() != no_frame_size,
216 "if stub has an oop map it must have a valid frame size");
217 assert(!expect_oop_map || oop_maps != NULL, "must have an oopmap");
218
219 // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned)
220 sasm->align(BytesPerWord);
221 // make sure all code is in code buffer
222 sasm->flush();
223
224 frame_size = sasm->frame_size();
225 must_gc_arguments = sasm->must_gc_arguments();
226 // create blob - distinguish a few special cases
227 CodeBlob* blob = RuntimeStub::new_runtime_stub(name,
228 &code,
229 CodeOffsets::frame_never_safe,
230 frame_size,
231 oop_maps,
232 must_gc_arguments);
233 assert(blob != NULL, "blob must exist");
234 return blob;
235 }
236
237 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) {
238 assert(0 <= id && id < number_of_ids, "illegal stub id");
239 bool expect_oop_map = true;
240 #ifdef ASSERT
241 // Make sure that stubs that need oopmaps have them
242 switch (id) {
243 // These stubs don't need to have an oopmap
244 case dtrace_object_alloc_id:
245 case slow_subtype_check_id:
246 case fpu2long_stub_id:
247 case unwind_exception_id:
248 case counter_overflow_id:
249 #if defined(SPARC) || defined(PPC32)
250 case handle_exception_nofpu_id: // Unused on sparc
251 #endif
252 expect_oop_map = false;
253 break;
254 default:
255 break;
256 }
257 #endif
258 StubIDStubAssemblerCodeGenClosure cl(id);
259 CodeBlob* blob = generate_blob(buffer_blob, id, name_for(id), expect_oop_map, &cl);
260 // install blob
261 _blobs[id] = blob;
262 }
263
264 void Runtime1::initialize(BufferBlob* blob) {
265 // platform-dependent initialization
266 initialize_pd();
267 // generate stubs
268 for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id);
269 // printing
270 #ifndef PRODUCT
271 if (PrintSimpleStubs) {
272 ResourceMark rm;
273 for (int id = 0; id < number_of_ids; id++) {
274 _blobs[id]->print();
275 if (_blobs[id]->oop_maps() != NULL) {
276 _blobs[id]->oop_maps()->print();
277 }
278 }
279 }
280 #endif
281 BarrierSetC1* bs = BarrierSet::barrier_set()->barrier_set_c1();
282 bs->generate_c1_runtime_stubs(blob);
283 }
284
285 CodeBlob* Runtime1::blob_for(StubID id) {
286 assert(0 <= id && id < number_of_ids, "illegal stub id");
287 return _blobs[id];
288 }
289
290
291 const char* Runtime1::name_for(StubID id) {
292 assert(0 <= id && id < number_of_ids, "illegal stub id");
293 return _blob_names[id];
294 }
295
296 const char* Runtime1::name_for_address(address entry) {
297 for (int id = 0; id < number_of_ids; id++) {
298 if (entry == entry_for((StubID)id)) return name_for((StubID)id);
299 }
300
301 #define FUNCTION_CASE(a, f) \
302 if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f)) return #f
303
304 FUNCTION_CASE(entry, os::javaTimeMillis);
305 FUNCTION_CASE(entry, os::javaTimeNanos);
306 FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end);
307 FUNCTION_CASE(entry, SharedRuntime::d2f);
308 FUNCTION_CASE(entry, SharedRuntime::d2i);
309 FUNCTION_CASE(entry, SharedRuntime::d2l);
310 FUNCTION_CASE(entry, SharedRuntime::dcos);
311 FUNCTION_CASE(entry, SharedRuntime::dexp);
312 FUNCTION_CASE(entry, SharedRuntime::dlog);
313 FUNCTION_CASE(entry, SharedRuntime::dlog10);
314 FUNCTION_CASE(entry, SharedRuntime::dpow);
315 FUNCTION_CASE(entry, SharedRuntime::drem);
316 FUNCTION_CASE(entry, SharedRuntime::dsin);
317 FUNCTION_CASE(entry, SharedRuntime::dtan);
318 FUNCTION_CASE(entry, SharedRuntime::f2i);
319 FUNCTION_CASE(entry, SharedRuntime::f2l);
320 FUNCTION_CASE(entry, SharedRuntime::frem);
321 FUNCTION_CASE(entry, SharedRuntime::l2d);
322 FUNCTION_CASE(entry, SharedRuntime::l2f);
323 FUNCTION_CASE(entry, SharedRuntime::ldiv);
324 FUNCTION_CASE(entry, SharedRuntime::lmul);
325 FUNCTION_CASE(entry, SharedRuntime::lrem);
326 FUNCTION_CASE(entry, SharedRuntime::lrem);
327 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry);
328 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit);
329 FUNCTION_CASE(entry, is_instance_of);
330 FUNCTION_CASE(entry, trace_block_entry);
331 #ifdef JFR_HAVE_INTRINSICS
332 FUNCTION_CASE(entry, JFR_TIME_FUNCTION);
333 #endif
334 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32());
335 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32C());
336 FUNCTION_CASE(entry, StubRoutines::vectorizedMismatch());
337 FUNCTION_CASE(entry, StubRoutines::dexp());
338 FUNCTION_CASE(entry, StubRoutines::dlog());
339 FUNCTION_CASE(entry, StubRoutines::dlog10());
340 FUNCTION_CASE(entry, StubRoutines::dpow());
341 FUNCTION_CASE(entry, StubRoutines::dsin());
342 FUNCTION_CASE(entry, StubRoutines::dcos());
343 FUNCTION_CASE(entry, StubRoutines::dtan());
344
345 #undef FUNCTION_CASE
346
347 // Soft float adds more runtime names.
348 return pd_name_for_address(entry);
349 }
350
351
352 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, Klass* klass))
353 NOT_PRODUCT(_new_instance_slowcase_cnt++;)
354
355 assert(klass->is_klass(), "not a class");
356 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive
357 InstanceKlass* h = InstanceKlass::cast(klass);
358 h->check_valid_for_instantiation(true, CHECK);
359 // make sure klass is initialized
360 h->initialize(CHECK);
361 // allocate instance and return via TLS
362 oop obj = h->allocate_instance(CHECK);
363 thread->set_vm_result(obj);
364 JRT_END
365
366
367 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, Klass* klass, jint length))
368 NOT_PRODUCT(_new_type_array_slowcase_cnt++;)
369 // Note: no handle for klass needed since they are not used
370 // anymore after new_typeArray() and no GC can happen before.
371 // (This may have to change if this code changes!)
372 assert(klass->is_klass(), "not a class");
373 BasicType elt_type = TypeArrayKlass::cast(klass)->element_type();
374 oop obj = oopFactory::new_typeArray(elt_type, length, CHECK);
375 thread->set_vm_result(obj);
376 // This is pretty rare but this runtime patch is stressful to deoptimization
377 // if we deoptimize here so force a deopt to stress the path.
378 if (DeoptimizeALot) {
379 deopt_caller();
380 }
381
382 JRT_END
383
384
385 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, Klass* array_klass, jint length))
386 NOT_PRODUCT(_new_object_array_slowcase_cnt++;)
387
388 // Note: no handle for klass needed since they are not used
389 // anymore after new_objArray() and no GC can happen before.
390 // (This may have to change if this code changes!)
391 assert(array_klass->is_klass(), "not a class");
392 Handle holder(THREAD, array_klass->klass_holder()); // keep the klass alive
393 Klass* elem_klass = ArrayKlass::cast(array_klass)->element_klass();
394 if (elem_klass->is_value()) {
395 arrayOop obj = oopFactory::new_valueArray(elem_klass, length, CHECK);
396 thread->set_vm_result(obj);
397 } else {
398 objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK);
399 thread->set_vm_result(obj);
400 }
401 // This is pretty rare but this runtime patch is stressful to deoptimization
402 // if we deoptimize here so force a deopt to stress the path.
403 if (DeoptimizeALot) {
404 deopt_caller();
405 }
406 JRT_END
407
408
409 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims))
410 NOT_PRODUCT(_new_multi_array_slowcase_cnt++;)
411
412 assert(klass->is_klass(), "not a class");
413 assert(rank >= 1, "rank must be nonzero");
414 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive
415 oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK);
416 thread->set_vm_result(obj);
417 JRT_END
418
419
420 JRT_ENTRY(void, Runtime1::load_flattened_array(JavaThread* thread, valueArrayOopDesc* array, int index))
421 NOT_PRODUCT(_load_flattened_array_slowcase_cnt++;)
422 Klass* klass = array->klass();
423 assert(klass->is_valueArray_klass(), "expected value array oop");
424 assert(array->length() > 0 && index < array->length(), "already checked");
425
426 ValueArrayKlass* vaklass = ValueArrayKlass::cast(klass);
427 ValueKlass* vklass = vaklass->element_klass();
428
429 // We have a non-empty flattened array, so the element type must have been initialized.
430 assert(vklass->is_initialized(), "must be");
431 Handle holder(THREAD, vklass->klass_holder()); // keep the vklass alive
432 valueArrayHandle ha(THREAD, array);
433 oop obj = vklass->allocate_instance(CHECK);
434
435 void* src = ha()->value_at_addr(index, vaklass->layout_helper());
436 vklass->value_store(src, vklass->data_for_oop(obj),
437 vaklass->element_byte_size(), true, false);
438 thread->set_vm_result(obj);
439 JRT_END
440
441
442 JRT_ENTRY(void, Runtime1::store_flattened_array(JavaThread* thread, valueArrayOopDesc* array, int index, oopDesc* value))
443 NOT_PRODUCT(_store_flattened_array_slowcase_cnt++;)
444 if (value == NULL) {
445 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
446 } else {
447 Klass* klass = array->klass();
448 assert(klass->is_valueArray_klass(), "expected value array");
449 assert(ArrayKlass::cast(klass)->element_klass() == value->klass(), "Store type incorrect");
450
451 ValueArrayKlass* vaklass = ValueArrayKlass::cast(klass);
452 ValueKlass* vklass = vaklass->element_klass();
453 const int lh = vaklass->layout_helper();
454 vklass->value_store(vklass->data_for_oop(value), array->value_at_addr(index, lh),
455 vaklass->element_byte_size(), true, false);
456 }
457 JRT_END
458
459
460 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id))
461 tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id);
462 JRT_END
463
464
465 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj))
466 ResourceMark rm(thread);
467 const char* klass_name = obj->klass()->external_name();
468 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name);
469 JRT_END
470
471
472 // counter_overflow() is called from within C1-compiled methods. The enclosing method is the method
473 // associated with the top activation record. The inlinee (that is possibly included in the enclosing
474 // method) method oop is passed as an argument. In order to do that it is embedded in the code as
475 // a constant.
476 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, Method* m) {
477 nmethod* osr_nm = NULL;
478 methodHandle method(THREAD, m);
479
480 RegisterMap map(THREAD, false);
481 frame fr = THREAD->last_frame().sender(&map);
482 nmethod* nm = (nmethod*) fr.cb();
483 assert(nm!= NULL && nm->is_nmethod(), "Sanity check");
484 methodHandle enclosing_method(THREAD, nm->method());
485
486 CompLevel level = (CompLevel)nm->comp_level();
487 int bci = InvocationEntryBci;
488 if (branch_bci != InvocationEntryBci) {
489 // Compute destination bci
490 address pc = method()->code_base() + branch_bci;
491 Bytecodes::Code branch = Bytecodes::code_at(method(), pc);
492 int offset = 0;
493 switch (branch) {
494 case Bytecodes::_if_icmplt: case Bytecodes::_iflt:
495 case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt:
496 case Bytecodes::_if_icmple: case Bytecodes::_ifle:
497 case Bytecodes::_if_icmpge: case Bytecodes::_ifge:
498 case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq:
499 case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne:
500 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto:
501 offset = (int16_t)Bytes::get_Java_u2(pc + 1);
502 break;
503 case Bytecodes::_goto_w:
504 offset = Bytes::get_Java_u4(pc + 1);
505 break;
506 default: ;
507 }
508 bci = branch_bci + offset;
509 }
510 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
511 osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, nm, THREAD);
512 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
513 return osr_nm;
514 }
515
516 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, Method* method))
517 nmethod* osr_nm;
518 JRT_BLOCK
519 osr_nm = counter_overflow_helper(thread, bci, method);
520 if (osr_nm != NULL) {
521 RegisterMap map(thread, false);
522 frame fr = thread->last_frame().sender(&map);
523 Deoptimization::deoptimize_frame(thread, fr.id());
524 }
525 JRT_BLOCK_END
526 return NULL;
527 JRT_END
528
529 extern void vm_exit(int code);
530
531 // Enter this method from compiled code handler below. This is where we transition
532 // to VM mode. This is done as a helper routine so that the method called directly
533 // from compiled code does not have to transition to VM. This allows the entry
534 // method to see if the nmethod that we have just looked up a handler for has
535 // been deoptimized while we were in the vm. This simplifies the assembly code
536 // cpu directories.
537 //
538 // We are entering here from exception stub (via the entry method below)
539 // If there is a compiled exception handler in this method, we will continue there;
540 // otherwise we will unwind the stack and continue at the caller of top frame method
541 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to
542 // control the area where we can allow a safepoint. After we exit the safepoint area we can
543 // check to see if the handler we are going to return is now in a nmethod that has
544 // been deoptimized. If that is the case we return the deopt blob
545 // unpack_with_exception entry instead. This makes life for the exception blob easier
546 // because making that same check and diverting is painful from assembly language.
547 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm))
548 // Reset method handle flag.
549 thread->set_is_method_handle_return(false);
550
551 Handle exception(thread, ex);
552 nm = CodeCache::find_nmethod(pc);
553 assert(nm != NULL, "this is not an nmethod");
554 // Adjust the pc as needed/
555 if (nm->is_deopt_pc(pc)) {
556 RegisterMap map(thread, false);
557 frame exception_frame = thread->last_frame().sender(&map);
558 // if the frame isn't deopted then pc must not correspond to the caller of last_frame
559 assert(exception_frame.is_deoptimized_frame(), "must be deopted");
560 pc = exception_frame.pc();
561 }
562 #ifdef ASSERT
563 assert(exception.not_null(), "NULL exceptions should be handled by throw_exception");
564 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
565 if (!(exception->is_a(SystemDictionary::Throwable_klass()))) {
566 if (ExitVMOnVerifyError) vm_exit(-1);
567 ShouldNotReachHere();
568 }
569 #endif
570
571 // Check the stack guard pages and reenable them if necessary and there is
572 // enough space on the stack to do so. Use fast exceptions only if the guard
573 // pages are enabled.
574 bool guard_pages_enabled = thread->stack_guards_enabled();
575 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
576
577 if (JvmtiExport::can_post_on_exceptions()) {
578 // To ensure correct notification of exception catches and throws
579 // we have to deoptimize here. If we attempted to notify the
580 // catches and throws during this exception lookup it's possible
581 // we could deoptimize on the way out of the VM and end back in
582 // the interpreter at the throw site. This would result in double
583 // notifications since the interpreter would also notify about
584 // these same catches and throws as it unwound the frame.
585
586 RegisterMap reg_map(thread);
587 frame stub_frame = thread->last_frame();
588 frame caller_frame = stub_frame.sender(®_map);
589
590 // We don't really want to deoptimize the nmethod itself since we
591 // can actually continue in the exception handler ourselves but I
592 // don't see an easy way to have the desired effect.
593 Deoptimization::deoptimize_frame(thread, caller_frame.id());
594 assert(caller_is_deopted(), "Must be deoptimized");
595
596 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
597 }
598
599 // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions
600 if (guard_pages_enabled) {
601 address fast_continuation = nm->handler_for_exception_and_pc(exception, pc);
602 if (fast_continuation != NULL) {
603 // Set flag if return address is a method handle call site.
604 thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
605 return fast_continuation;
606 }
607 }
608
609 // If the stack guard pages are enabled, check whether there is a handler in
610 // the current method. Otherwise (guard pages disabled), force an unwind and
611 // skip the exception cache update (i.e., just leave continuation==NULL).
612 address continuation = NULL;
613 if (guard_pages_enabled) {
614
615 // New exception handling mechanism can support inlined methods
616 // with exception handlers since the mappings are from PC to PC
617
618 // debugging support
619 // tracing
620 if (log_is_enabled(Info, exceptions)) {
621 ResourceMark rm;
622 stringStream tempst;
623 assert(nm->method() != NULL, "Unexpected NULL method()");
624 tempst.print("compiled method <%s>\n"
625 " at PC" INTPTR_FORMAT " for thread " INTPTR_FORMAT,
626 nm->method()->print_value_string(), p2i(pc), p2i(thread));
627 Exceptions::log_exception(exception, tempst);
628 }
629 // for AbortVMOnException flag
630 Exceptions::debug_check_abort(exception);
631
632 // Clear out the exception oop and pc since looking up an
633 // exception handler can cause class loading, which might throw an
634 // exception and those fields are expected to be clear during
635 // normal bytecode execution.
636 thread->clear_exception_oop_and_pc();
637
638 bool recursive_exception = false;
639 continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false, recursive_exception);
640 // If an exception was thrown during exception dispatch, the exception oop may have changed
641 thread->set_exception_oop(exception());
642 thread->set_exception_pc(pc);
643
644 // the exception cache is used only by non-implicit exceptions
645 // Update the exception cache only when there didn't happen
646 // another exception during the computation of the compiled
647 // exception handler. Checking for exception oop equality is not
648 // sufficient because some exceptions are pre-allocated and reused.
649 if (continuation != NULL && !recursive_exception) {
650 nm->add_handler_for_exception_and_pc(exception, pc, continuation);
651 }
652 }
653
654 thread->set_vm_result(exception());
655 // Set flag if return address is a method handle call site.
656 thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
657
658 if (log_is_enabled(Info, exceptions)) {
659 ResourceMark rm;
660 log_info(exceptions)("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT
661 " for exception thrown at PC " PTR_FORMAT,
662 p2i(thread), p2i(continuation), p2i(pc));
663 }
664
665 return continuation;
666 JRT_END
667
668 // Enter this method from compiled code only if there is a Java exception handler
669 // in the method handling the exception.
670 // We are entering here from exception stub. We don't do a normal VM transition here.
671 // We do it in a helper. This is so we can check to see if the nmethod we have just
672 // searched for an exception handler has been deoptimized in the meantime.
673 address Runtime1::exception_handler_for_pc(JavaThread* thread) {
674 oop exception = thread->exception_oop();
675 address pc = thread->exception_pc();
676 // Still in Java mode
677 DEBUG_ONLY(ResetNoHandleMark rnhm);
678 nmethod* nm = NULL;
679 address continuation = NULL;
680 {
681 // Enter VM mode by calling the helper
682 ResetNoHandleMark rnhm;
683 continuation = exception_handler_for_pc_helper(thread, exception, pc, nm);
684 }
685 // Back in JAVA, use no oops DON'T safepoint
686
687 // Now check to see if the nmethod we were called from is now deoptimized.
688 // If so we must return to the deopt blob and deoptimize the nmethod
689 if (nm != NULL && caller_is_deopted()) {
690 continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
691 }
692
693 assert(continuation != NULL, "no handler found");
694 return continuation;
695 }
696
697
698 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index, arrayOopDesc* a))
699 NOT_PRODUCT(_throw_range_check_exception_count++;)
700 const int len = 35;
701 assert(len < strlen("Index %d out of bounds for length %d"), "Must allocate more space for message.");
702 char message[2 * jintAsStringSize + len];
703 sprintf(message, "Index %d out of bounds for length %d", index, a->length());
704 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message);
705 JRT_END
706
707
708 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index))
709 NOT_PRODUCT(_throw_index_exception_count++;)
710 char message[16];
711 sprintf(message, "%d", index);
712 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message);
713 JRT_END
714
715
716 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread))
717 NOT_PRODUCT(_throw_div0_exception_count++;)
718 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
719 JRT_END
720
721
722 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread))
723 NOT_PRODUCT(_throw_null_pointer_exception_count++;)
724 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
725 JRT_END
726
727
728 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object))
729 NOT_PRODUCT(_throw_class_cast_exception_count++;)
730 ResourceMark rm(thread);
731 char* message = SharedRuntime::generate_class_cast_message(
732 thread, object->klass());
733 SharedRuntime::throw_and_post_jvmti_exception(
734 thread, vmSymbols::java_lang_ClassCastException(), message);
735 JRT_END
736
737
738 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread))
739 NOT_PRODUCT(_throw_incompatible_class_change_error_count++;)
740 ResourceMark rm(thread);
741 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError());
742 JRT_END
743
744
745 JRT_ENTRY(void, Runtime1::throw_illegal_monitor_state_exception(JavaThread* thread))
746 NOT_PRODUCT(_throw_illegal_monitor_state_exception_count++;)
747 ResourceMark rm(thread);
748 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IllegalMonitorStateException());
749 JRT_END
750
751
752 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock))
753 NOT_PRODUCT(_monitorenter_slowcase_cnt++;)
754 if (PrintBiasedLockingStatistics) {
755 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
756 }
757 Handle h_obj(thread, obj);
758 if (UseBiasedLocking) {
759 // Retry fast entry if bias is revoked to avoid unnecessary inflation
760 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK);
761 } else {
762 if (UseFastLocking) {
763 // When using fast locking, the compiled code has already tried the fast case
764 assert(obj == lock->obj(), "must match");
765 ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD);
766 } else {
767 lock->set_obj(obj);
768 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD);
769 }
770 }
771 JRT_END
772
773
774 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock))
775 NOT_PRODUCT(_monitorexit_slowcase_cnt++;)
776 assert(thread == JavaThread::current(), "threads must correspond");
777 assert(thread->last_Java_sp(), "last_Java_sp must be set");
778 // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown
779 EXCEPTION_MARK;
780
781 oop obj = lock->obj();
782 assert(oopDesc::is_oop(obj), "must be NULL or an object");
783 if (UseFastLocking) {
784 // When using fast locking, the compiled code has already tried the fast case
785 ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD);
786 } else {
787 ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD);
788 }
789 JRT_END
790
791 // Cf. OptoRuntime::deoptimize_caller_frame
792 JRT_ENTRY(void, Runtime1::deoptimize(JavaThread* thread, jint trap_request))
793 // Called from within the owner thread, so no need for safepoint
794 RegisterMap reg_map(thread, false);
795 frame stub_frame = thread->last_frame();
796 assert(stub_frame.is_runtime_frame(), "Sanity check");
797 frame caller_frame = stub_frame.sender(®_map);
798 nmethod* nm = caller_frame.cb()->as_nmethod_or_null();
799 assert(nm != NULL, "Sanity check");
800 methodHandle method(thread, nm->method());
801 assert(nm == CodeCache::find_nmethod(caller_frame.pc()), "Should be the same");
802 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request);
803 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request);
804
805 if (action == Deoptimization::Action_make_not_entrant) {
806 if (nm->make_not_entrant()) {
807 if (reason == Deoptimization::Reason_tenured) {
808 MethodData* trap_mdo = Deoptimization::get_method_data(thread, method, true /*create_if_missing*/);
809 if (trap_mdo != NULL) {
810 trap_mdo->inc_tenure_traps();
811 }
812 }
813 }
814 }
815
816 // Deoptimize the caller frame.
817 Deoptimization::deoptimize_frame(thread, caller_frame.id());
818 // Return to the now deoptimized frame.
819 JRT_END
820
821
822 #ifndef DEOPTIMIZE_WHEN_PATCHING
823
824 static Klass* resolve_field_return_klass(const methodHandle& caller, int bci, TRAPS) {
825 Bytecode_field field_access(caller, bci);
826 // This can be static or non-static field access
827 Bytecodes::Code code = field_access.code();
828
829 // We must load class, initialize class and resolve the field
830 fieldDescriptor result; // initialize class if needed
831 constantPoolHandle constants(THREAD, caller->constants());
832 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller, Bytecodes::java_code(code), CHECK_NULL);
833 return result.field_holder();
834 }
835
836
837 //
838 // This routine patches sites where a class wasn't loaded or
839 // initialized at the time the code was generated. It handles
840 // references to classes, fields and forcing of initialization. Most
841 // of the cases are straightforward and involving simply forcing
842 // resolution of a class, rewriting the instruction stream with the
843 // needed constant and replacing the call in this function with the
844 // patched code. The case for static field is more complicated since
845 // the thread which is in the process of initializing a class can
846 // access it's static fields but other threads can't so the code
847 // either has to deoptimize when this case is detected or execute a
848 // check that the current thread is the initializing thread. The
849 // current
850 //
851 // Patches basically look like this:
852 //
853 //
854 // patch_site: jmp patch stub ;; will be patched
855 // continue: ...
856 // ...
857 // ...
858 // ...
859 //
860 // They have a stub which looks like this:
861 //
862 // ;; patch body
863 // movl <const>, reg (for class constants)
864 // <or> movl [reg1 + <const>], reg (for field offsets)
865 // <or> movl reg, [reg1 + <const>] (for field offsets)
866 // <being_init offset> <bytes to copy> <bytes to skip>
867 // patch_stub: call Runtime1::patch_code (through a runtime stub)
868 // jmp patch_site
869 //
870 //
871 // A normal patch is done by rewriting the patch body, usually a move,
872 // and then copying it into place over top of the jmp instruction
873 // being careful to flush caches and doing it in an MP-safe way. The
874 // constants following the patch body are used to find various pieces
875 // of the patch relative to the call site for Runtime1::patch_code.
876 // The case for getstatic and putstatic is more complicated because
877 // getstatic and putstatic have special semantics when executing while
878 // the class is being initialized. getstatic/putstatic on a class
879 // which is being_initialized may be executed by the initializing
880 // thread but other threads have to block when they execute it. This
881 // is accomplished in compiled code by executing a test of the current
882 // thread against the initializing thread of the class. It's emitted
883 // as boilerplate in their stub which allows the patched code to be
884 // executed before it's copied back into the main body of the nmethod.
885 //
886 // being_init: get_thread(<tmp reg>
887 // cmpl [reg1 + <init_thread_offset>], <tmp reg>
888 // jne patch_stub
889 // movl [reg1 + <const>], reg (for field offsets) <or>
890 // movl reg, [reg1 + <const>] (for field offsets)
891 // jmp continue
892 // <being_init offset> <bytes to copy> <bytes to skip>
893 // patch_stub: jmp Runtim1::patch_code (through a runtime stub)
894 // jmp patch_site
895 //
896 // If the class is being initialized the patch body is rewritten and
897 // the patch site is rewritten to jump to being_init, instead of
898 // patch_stub. Whenever this code is executed it checks the current
899 // thread against the intializing thread so other threads will enter
900 // the runtime and end up blocked waiting the class to finish
901 // initializing inside the calls to resolve_field below. The
902 // initializing class will continue on it's way. Once the class is
903 // fully_initialized, the intializing_thread of the class becomes
904 // NULL, so the next thread to execute this code will fail the test,
905 // call into patch_code and complete the patching process by copying
906 // the patch body back into the main part of the nmethod and resume
907 // executing.
908
909 // NB:
910 //
911 // Patchable instruction sequences inherently exhibit race conditions,
912 // where thread A is patching an instruction at the same time thread B
913 // is executing it. The algorithms we use ensure that any observation
914 // that B can make on any intermediate states during A's patching will
915 // always end up with a correct outcome. This is easiest if there are
916 // few or no intermediate states. (Some inline caches have two
917 // related instructions that must be patched in tandem. For those,
918 // intermediate states seem to be unavoidable, but we will get the
919 // right answer from all possible observation orders.)
920 //
921 // When patching the entry instruction at the head of a method, or a
922 // linkable call instruction inside of a method, we try very hard to
923 // use a patch sequence which executes as a single memory transaction.
924 // This means, in practice, that when thread A patches an instruction,
925 // it should patch a 32-bit or 64-bit word that somehow overlaps the
926 // instruction or is contained in it. We believe that memory hardware
927 // will never break up such a word write, if it is naturally aligned
928 // for the word being written. We also know that some CPUs work very
929 // hard to create atomic updates even of naturally unaligned words,
930 // but we don't want to bet the farm on this always working.
931 //
932 // Therefore, if there is any chance of a race condition, we try to
933 // patch only naturally aligned words, as single, full-word writes.
934
935 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))
936 NOT_PRODUCT(_patch_code_slowcase_cnt++;)
937
938 ResourceMark rm(thread);
939 RegisterMap reg_map(thread, false);
940 frame runtime_frame = thread->last_frame();
941 frame caller_frame = runtime_frame.sender(®_map);
942
943 // last java frame on stack
944 vframeStream vfst(thread, true);
945 assert(!vfst.at_end(), "Java frame must exist");
946
947 methodHandle caller_method(THREAD, vfst.method());
948 // Note that caller_method->code() may not be same as caller_code because of OSR's
949 // Note also that in the presence of inlining it is not guaranteed
950 // that caller_method() == caller_code->method()
951
952 int bci = vfst.bci();
953 Bytecodes::Code code = caller_method()->java_code_at(bci);
954
955 // this is used by assertions in the access_field_patching_id
956 BasicType patch_field_type = T_ILLEGAL;
957 bool deoptimize_for_volatile = false;
958 bool deoptimize_for_atomic = false;
959 int patch_field_offset = -1;
960 Klass* init_klass = NULL; // klass needed by load_klass_patching code
961 Klass* load_klass = NULL; // klass needed by load_klass_patching code
962 Handle mirror(THREAD, NULL); // oop needed by load_mirror_patching code
963 Handle appendix(THREAD, NULL); // oop needed by appendix_patching code
964 bool load_klass_or_mirror_patch_id =
965 (stub_id == Runtime1::load_klass_patching_id || stub_id == Runtime1::load_mirror_patching_id);
966
967 if (stub_id == Runtime1::access_field_patching_id) {
968
969 Bytecode_field field_access(caller_method, bci);
970 fieldDescriptor result; // initialize class if needed
971 Bytecodes::Code code = field_access.code();
972 constantPoolHandle constants(THREAD, caller_method->constants());
973 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller_method, Bytecodes::java_code(code), CHECK);
974 patch_field_offset = result.offset();
975
976 // If we're patching a field which is volatile then at compile it
977 // must not have been know to be volatile, so the generated code
978 // isn't correct for a volatile reference. The nmethod has to be
979 // deoptimized so that the code can be regenerated correctly.
980 // This check is only needed for access_field_patching since this
981 // is the path for patching field offsets. load_klass is only
982 // used for patching references to oops which don't need special
983 // handling in the volatile case.
984
985 deoptimize_for_volatile = result.access_flags().is_volatile();
986
987 // If we are patching a field which should be atomic, then
988 // the generated code is not correct either, force deoptimizing.
989 // We need to only cover T_LONG and T_DOUBLE fields, as we can
990 // break access atomicity only for them.
991
992 // Strictly speaking, the deoptimization on 64-bit platforms
993 // is unnecessary, and T_LONG stores on 32-bit platforms need
994 // to be handled by special patching code when AlwaysAtomicAccesses
995 // becomes product feature. At this point, we are still going
996 // for the deoptimization for consistency against volatile
997 // accesses.
998
999 patch_field_type = result.field_type();
1000 deoptimize_for_atomic = (AlwaysAtomicAccesses && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG));
1001
1002 } else if (load_klass_or_mirror_patch_id) {
1003 Klass* k = NULL;
1004 switch (code) {
1005 case Bytecodes::_putstatic:
1006 case Bytecodes::_getstatic:
1007 { Klass* klass = resolve_field_return_klass(caller_method, bci, CHECK);
1008 init_klass = klass;
1009 mirror = Handle(THREAD, klass->java_mirror());
1010 }
1011 break;
1012 case Bytecodes::_new:
1013 { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci));
1014 k = caller_method->constants()->klass_at(bnew.index(), CHECK);
1015 }
1016 break;
1017 case Bytecodes::_defaultvalue:
1018 { Bytecode_defaultvalue bdefaultvalue(caller_method(), caller_method->bcp_from(bci));
1019 k = caller_method->constants()->klass_at(bdefaultvalue.index(), CHECK);
1020 }
1021 break;
1022 case Bytecodes::_multianewarray:
1023 { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci));
1024 k = caller_method->constants()->klass_at(mna.index(), CHECK);
1025 }
1026 break;
1027 case Bytecodes::_instanceof:
1028 { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci));
1029 k = caller_method->constants()->klass_at(io.index(), CHECK);
1030 }
1031 break;
1032 case Bytecodes::_checkcast:
1033 { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci));
1034 k = caller_method->constants()->klass_at(cc.index(), CHECK);
1035 }
1036 break;
1037 case Bytecodes::_anewarray:
1038 { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci));
1039 Klass* ek = caller_method->constants()->klass_at(anew.index(), CHECK);
1040 k = ek->array_klass(CHECK);
1041 }
1042 break;
1043 case Bytecodes::_ldc:
1044 case Bytecodes::_ldc_w:
1045 {
1046 Bytecode_loadconstant cc(caller_method, bci);
1047 oop m = cc.resolve_constant(CHECK);
1048 mirror = Handle(THREAD, m);
1049 }
1050 break;
1051 default: fatal("unexpected bytecode for load_klass_or_mirror_patch_id");
1052 }
1053 load_klass = k;
1054 } else if (stub_id == load_appendix_patching_id) {
1055 Bytecode_invoke bytecode(caller_method, bci);
1056 Bytecodes::Code bc = bytecode.invoke_code();
1057
1058 CallInfo info;
1059 constantPoolHandle pool(thread, caller_method->constants());
1060 int index = bytecode.index();
1061 LinkResolver::resolve_invoke(info, Handle(), pool, index, bc, CHECK);
1062 switch (bc) {
1063 case Bytecodes::_invokehandle: {
1064 int cache_index = ConstantPool::decode_cpcache_index(index, true);
1065 assert(cache_index >= 0 && cache_index < pool->cache()->length(), "unexpected cache index");
1066 ConstantPoolCacheEntry* cpce = pool->cache()->entry_at(cache_index);
1067 cpce->set_method_handle(pool, info);
1068 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry
1069 break;
1070 }
1071 case Bytecodes::_invokedynamic: {
1072 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
1073 cpce->set_dynamic_call(pool, info);
1074 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry
1075 break;
1076 }
1077 default: fatal("unexpected bytecode for load_appendix_patching_id");
1078 }
1079 } else {
1080 ShouldNotReachHere();
1081 }
1082
1083 if (deoptimize_for_volatile || deoptimize_for_atomic) {
1084 // At compile time we assumed the field wasn't volatile/atomic but after
1085 // loading it turns out it was volatile/atomic so we have to throw the
1086 // compiled code out and let it be regenerated.
1087 if (TracePatching) {
1088 if (deoptimize_for_volatile) {
1089 tty->print_cr("Deoptimizing for patching volatile field reference");
1090 }
1091 if (deoptimize_for_atomic) {
1092 tty->print_cr("Deoptimizing for patching atomic field reference");
1093 }
1094 }
1095
1096 // It's possible the nmethod was invalidated in the last
1097 // safepoint, but if it's still alive then make it not_entrant.
1098 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1099 if (nm != NULL) {
1100 nm->make_not_entrant();
1101 }
1102
1103 Deoptimization::deoptimize_frame(thread, caller_frame.id());
1104
1105 // Return to the now deoptimized frame.
1106 }
1107
1108 // Now copy code back
1109
1110 {
1111 MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag);
1112 //
1113 // Deoptimization may have happened while we waited for the lock.
1114 // In that case we don't bother to do any patching we just return
1115 // and let the deopt happen
1116 if (!caller_is_deopted()) {
1117 NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc());
1118 address instr_pc = jump->jump_destination();
1119 NativeInstruction* ni = nativeInstruction_at(instr_pc);
1120 if (ni->is_jump() ) {
1121 // the jump has not been patched yet
1122 // The jump destination is slow case and therefore not part of the stubs
1123 // (stubs are only for StaticCalls)
1124
1125 // format of buffer
1126 // ....
1127 // instr byte 0 <-- copy_buff
1128 // instr byte 1
1129 // ..
1130 // instr byte n-1
1131 // n
1132 // .... <-- call destination
1133
1134 address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset();
1135 unsigned char* byte_count = (unsigned char*) (stub_location - 1);
1136 unsigned char* byte_skip = (unsigned char*) (stub_location - 2);
1137 unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3);
1138 address copy_buff = stub_location - *byte_skip - *byte_count;
1139 address being_initialized_entry = stub_location - *being_initialized_entry_offset;
1140 if (TracePatching) {
1141 ttyLocker ttyl;
1142 tty->print_cr(" Patching %s at bci %d at address " INTPTR_FORMAT " (%s)", Bytecodes::name(code), bci,
1143 p2i(instr_pc), (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass");
1144 nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc());
1145 assert(caller_code != NULL, "nmethod not found");
1146
1147 // NOTE we use pc() not original_pc() because we already know they are
1148 // identical otherwise we'd have never entered this block of code
1149
1150 const ImmutableOopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc());
1151 assert(map != NULL, "null check");
1152 map->print();
1153 tty->cr();
1154
1155 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1156 }
1157 // depending on the code below, do_patch says whether to copy the patch body back into the nmethod
1158 bool do_patch = true;
1159 if (stub_id == Runtime1::access_field_patching_id) {
1160 // The offset may not be correct if the class was not loaded at code generation time.
1161 // Set it now.
1162 NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff);
1163 assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type");
1164 assert(patch_field_offset >= 0, "illegal offset");
1165 n_move->add_offset_in_bytes(patch_field_offset);
1166 } else if (load_klass_or_mirror_patch_id) {
1167 // If a getstatic or putstatic is referencing a klass which
1168 // isn't fully initialized, the patch body isn't copied into
1169 // place until initialization is complete. In this case the
1170 // patch site is setup so that any threads besides the
1171 // initializing thread are forced to come into the VM and
1172 // block.
1173 do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) ||
1174 InstanceKlass::cast(init_klass)->is_initialized();
1175 NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc);
1176 if (jump->jump_destination() == being_initialized_entry) {
1177 assert(do_patch == true, "initialization must be complete at this point");
1178 } else {
1179 // patch the instruction <move reg, klass>
1180 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
1181
1182 assert(n_copy->data() == 0 ||
1183 n_copy->data() == (intptr_t)Universe::non_oop_word(),
1184 "illegal init value");
1185 if (stub_id == Runtime1::load_klass_patching_id) {
1186 assert(load_klass != NULL, "klass not set");
1187 n_copy->set_data((intx) (load_klass));
1188 } else {
1189 assert(mirror() != NULL, "klass not set");
1190 // Don't need a G1 pre-barrier here since we assert above that data isn't an oop.
1191 n_copy->set_data(cast_from_oop<intx>(mirror()));
1192 }
1193
1194 if (TracePatching) {
1195 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1196 }
1197 }
1198 } else if (stub_id == Runtime1::load_appendix_patching_id) {
1199 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
1200 assert(n_copy->data() == 0 ||
1201 n_copy->data() == (intptr_t)Universe::non_oop_word(),
1202 "illegal init value");
1203 n_copy->set_data(cast_from_oop<intx>(appendix()));
1204
1205 if (TracePatching) {
1206 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1207 }
1208 } else {
1209 ShouldNotReachHere();
1210 }
1211
1212 #if defined(SPARC) || defined(PPC32)
1213 if (load_klass_or_mirror_patch_id ||
1214 stub_id == Runtime1::load_appendix_patching_id) {
1215 // Update the location in the nmethod with the proper
1216 // metadata. When the code was generated, a NULL was stuffed
1217 // in the metadata table and that table needs to be update to
1218 // have the right value. On intel the value is kept
1219 // directly in the instruction instead of in the metadata
1220 // table, so set_data above effectively updated the value.
1221 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1222 assert(nm != NULL, "invalid nmethod_pc");
1223 RelocIterator mds(nm, copy_buff, copy_buff + 1);
1224 bool found = false;
1225 while (mds.next() && !found) {
1226 if (mds.type() == relocInfo::oop_type) {
1227 assert(stub_id == Runtime1::load_mirror_patching_id ||
1228 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id");
1229 oop_Relocation* r = mds.oop_reloc();
1230 oop* oop_adr = r->oop_addr();
1231 *oop_adr = stub_id == Runtime1::load_mirror_patching_id ? mirror() : appendix();
1232 r->fix_oop_relocation();
1233 found = true;
1234 } else if (mds.type() == relocInfo::metadata_type) {
1235 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id");
1236 metadata_Relocation* r = mds.metadata_reloc();
1237 Metadata** metadata_adr = r->metadata_addr();
1238 *metadata_adr = load_klass;
1239 r->fix_metadata_relocation();
1240 found = true;
1241 }
1242 }
1243 assert(found, "the metadata must exist!");
1244 }
1245 #endif
1246 if (do_patch) {
1247 // replace instructions
1248 // first replace the tail, then the call
1249 #ifdef ARM
1250 if((load_klass_or_mirror_patch_id ||
1251 stub_id == Runtime1::load_appendix_patching_id) &&
1252 nativeMovConstReg_at(copy_buff)->is_pc_relative()) {
1253 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1254 address addr = NULL;
1255 assert(nm != NULL, "invalid nmethod_pc");
1256 RelocIterator mds(nm, copy_buff, copy_buff + 1);
1257 while (mds.next()) {
1258 if (mds.type() == relocInfo::oop_type) {
1259 assert(stub_id == Runtime1::load_mirror_patching_id ||
1260 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id");
1261 oop_Relocation* r = mds.oop_reloc();
1262 addr = (address)r->oop_addr();
1263 break;
1264 } else if (mds.type() == relocInfo::metadata_type) {
1265 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id");
1266 metadata_Relocation* r = mds.metadata_reloc();
1267 addr = (address)r->metadata_addr();
1268 break;
1269 }
1270 }
1271 assert(addr != NULL, "metadata relocation must exist");
1272 copy_buff -= *byte_count;
1273 NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff);
1274 n_copy2->set_pc_relative_offset(addr, instr_pc);
1275 }
1276 #endif
1277
1278 for (int i = NativeGeneralJump::instruction_size; i < *byte_count; i++) {
1279 address ptr = copy_buff + i;
1280 int a_byte = (*ptr) & 0xFF;
1281 address dst = instr_pc + i;
1282 *(unsigned char*)dst = (unsigned char) a_byte;
1283 }
1284 ICache::invalidate_range(instr_pc, *byte_count);
1285 NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff);
1286
1287 if (load_klass_or_mirror_patch_id ||
1288 stub_id == Runtime1::load_appendix_patching_id) {
1289 relocInfo::relocType rtype =
1290 (stub_id == Runtime1::load_klass_patching_id) ?
1291 relocInfo::metadata_type :
1292 relocInfo::oop_type;
1293 // update relocInfo to metadata
1294 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1295 assert(nm != NULL, "invalid nmethod_pc");
1296
1297 // The old patch site is now a move instruction so update
1298 // the reloc info so that it will get updated during
1299 // future GCs.
1300 RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1));
1301 relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc,
1302 relocInfo::none, rtype);
1303 #ifdef SPARC
1304 // Sparc takes two relocations for an metadata so update the second one.
1305 address instr_pc2 = instr_pc + NativeMovConstReg::add_offset;
1306 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
1307 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
1308 relocInfo::none, rtype);
1309 #endif
1310 #ifdef PPC32
1311 { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset;
1312 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
1313 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
1314 relocInfo::none, rtype);
1315 }
1316 #endif
1317 }
1318
1319 } else {
1320 ICache::invalidate_range(copy_buff, *byte_count);
1321 NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry);
1322 }
1323 }
1324 }
1325 }
1326
1327 // If we are patching in a non-perm oop, make sure the nmethod
1328 // is on the right list.
1329 if (ScavengeRootsInCode) {
1330 MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag);
1331 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1332 guarantee(nm != NULL, "only nmethods can contain non-perm oops");
1333
1334 // Since we've patched some oops in the nmethod,
1335 // (re)register it with the heap.
1336 Universe::heap()->register_nmethod(nm);
1337 }
1338 JRT_END
1339
1340 #else // DEOPTIMIZE_WHEN_PATCHING
1341
1342 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))
1343 RegisterMap reg_map(thread, false);
1344
1345 NOT_PRODUCT(_patch_code_slowcase_cnt++;)
1346 if (TracePatching) {
1347 tty->print_cr("Deoptimizing because patch is needed");
1348 }
1349
1350 frame runtime_frame = thread->last_frame();
1351 frame caller_frame = runtime_frame.sender(®_map);
1352
1353 // It's possible the nmethod was invalidated in the last
1354 // safepoint, but if it's still alive then make it not_entrant.
1355 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1356 if (nm != NULL) {
1357 nm->make_not_entrant();
1358 }
1359
1360 Deoptimization::deoptimize_frame(thread, caller_frame.id());
1361
1362 // Return to the now deoptimized frame.
1363 JRT_END
1364
1365 #endif // DEOPTIMIZE_WHEN_PATCHING
1366
1367 //
1368 // Entry point for compiled code. We want to patch a nmethod.
1369 // We don't do a normal VM transition here because we want to
1370 // know after the patching is complete and any safepoint(s) are taken
1371 // if the calling nmethod was deoptimized. We do this by calling a
1372 // helper method which does the normal VM transition and when it
1373 // completes we can check for deoptimization. This simplifies the
1374 // assembly code in the cpu directories.
1375 //
1376 int Runtime1::move_klass_patching(JavaThread* thread) {
1377 //
1378 // NOTE: we are still in Java
1379 //
1380 Thread* THREAD = thread;
1381 debug_only(NoHandleMark nhm;)
1382 {
1383 // Enter VM mode
1384
1385 ResetNoHandleMark rnhm;
1386 patch_code(thread, load_klass_patching_id);
1387 }
1388 // Back in JAVA, use no oops DON'T safepoint
1389
1390 // Return true if calling code is deoptimized
1391
1392 return caller_is_deopted();
1393 }
1394
1395 int Runtime1::move_mirror_patching(JavaThread* thread) {
1396 //
1397 // NOTE: we are still in Java
1398 //
1399 Thread* THREAD = thread;
1400 debug_only(NoHandleMark nhm;)
1401 {
1402 // Enter VM mode
1403
1404 ResetNoHandleMark rnhm;
1405 patch_code(thread, load_mirror_patching_id);
1406 }
1407 // Back in JAVA, use no oops DON'T safepoint
1408
1409 // Return true if calling code is deoptimized
1410
1411 return caller_is_deopted();
1412 }
1413
1414 int Runtime1::move_appendix_patching(JavaThread* thread) {
1415 //
1416 // NOTE: we are still in Java
1417 //
1418 Thread* THREAD = thread;
1419 debug_only(NoHandleMark nhm;)
1420 {
1421 // Enter VM mode
1422
1423 ResetNoHandleMark rnhm;
1424 patch_code(thread, load_appendix_patching_id);
1425 }
1426 // Back in JAVA, use no oops DON'T safepoint
1427
1428 // Return true if calling code is deoptimized
1429
1430 return caller_is_deopted();
1431 }
1432 //
1433 // Entry point for compiled code. We want to patch a nmethod.
1434 // We don't do a normal VM transition here because we want to
1435 // know after the patching is complete and any safepoint(s) are taken
1436 // if the calling nmethod was deoptimized. We do this by calling a
1437 // helper method which does the normal VM transition and when it
1438 // completes we can check for deoptimization. This simplifies the
1439 // assembly code in the cpu directories.
1440 //
1441
1442 int Runtime1::access_field_patching(JavaThread* thread) {
1443 //
1444 // NOTE: we are still in Java
1445 //
1446 Thread* THREAD = thread;
1447 debug_only(NoHandleMark nhm;)
1448 {
1449 // Enter VM mode
1450
1451 ResetNoHandleMark rnhm;
1452 patch_code(thread, access_field_patching_id);
1453 }
1454 // Back in JAVA, use no oops DON'T safepoint
1455
1456 // Return true if calling code is deoptimized
1457
1458 return caller_is_deopted();
1459 JRT_END
1460
1461
1462 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id))
1463 // for now we just print out the block id
1464 tty->print("%d ", block_id);
1465 JRT_END
1466
1467
1468 JRT_LEAF(int, Runtime1::is_instance_of(oopDesc* mirror, oopDesc* obj))
1469 // had to return int instead of bool, otherwise there may be a mismatch
1470 // between the C calling convention and the Java one.
1471 // e.g., on x86, GCC may clear only %al when returning a bool false, but
1472 // JVM takes the whole %eax as the return value, which may misinterpret
1473 // the return value as a boolean true.
1474
1475 assert(mirror != NULL, "should null-check on mirror before calling");
1476 Klass* k = java_lang_Class::as_Klass(mirror);
1477 return (k != NULL && obj != NULL && obj->is_a(k)) ? 1 : 0;
1478 JRT_END
1479
1480 JRT_ENTRY(void, Runtime1::predicate_failed_trap(JavaThread* thread))
1481 ResourceMark rm;
1482
1483 assert(!TieredCompilation, "incompatible with tiered compilation");
1484
1485 RegisterMap reg_map(thread, false);
1486 frame runtime_frame = thread->last_frame();
1487 frame caller_frame = runtime_frame.sender(®_map);
1488
1489 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1490 assert (nm != NULL, "no more nmethod?");
1491 nm->make_not_entrant();
1492
1493 methodHandle m(nm->method());
1494 MethodData* mdo = m->method_data();
1495
1496 if (mdo == NULL && !HAS_PENDING_EXCEPTION) {
1497 // Build an MDO. Ignore errors like OutOfMemory;
1498 // that simply means we won't have an MDO to update.
1499 Method::build_interpreter_method_data(m, THREAD);
1500 if (HAS_PENDING_EXCEPTION) {
1501 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1502 CLEAR_PENDING_EXCEPTION;
1503 }
1504 mdo = m->method_data();
1505 }
1506
1507 if (mdo != NULL) {
1508 mdo->inc_trap_count(Deoptimization::Reason_none);
1509 }
1510
1511 if (TracePredicateFailedTraps) {
1512 stringStream ss1, ss2;
1513 vframeStream vfst(thread);
1514 methodHandle inlinee = methodHandle(vfst.method());
1515 inlinee->print_short_name(&ss1);
1516 m->print_short_name(&ss2);
1517 tty->print_cr("Predicate failed trap in method %s at bci %d inlined in %s at pc " INTPTR_FORMAT, ss1.as_string(), vfst.bci(), ss2.as_string(), p2i(caller_frame.pc()));
1518 }
1519
1520
1521 Deoptimization::deoptimize_frame(thread, caller_frame.id());
1522
1523 JRT_END
1524
1525 #ifndef PRODUCT
1526 void Runtime1::print_statistics() {
1527 tty->print_cr("C1 Runtime statistics:");
1528 tty->print_cr(" _resolve_invoke_virtual_cnt: %d", SharedRuntime::_resolve_virtual_ctr);
1529 tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr);
1530 tty->print_cr(" _resolve_invoke_static_cnt: %d", SharedRuntime::_resolve_static_ctr);
1531 tty->print_cr(" _handle_wrong_method_cnt: %d", SharedRuntime::_wrong_method_ctr);
1532 tty->print_cr(" _ic_miss_cnt: %d", SharedRuntime::_ic_miss_ctr);
1533 tty->print_cr(" _generic_arraycopy_cnt: %d", _generic_arraycopy_cnt);
1534 tty->print_cr(" _generic_arraycopystub_cnt: %d", _generic_arraycopystub_cnt);
1535 tty->print_cr(" _byte_arraycopy_cnt: %d", _byte_arraycopy_stub_cnt);
1536 tty->print_cr(" _short_arraycopy_cnt: %d", _short_arraycopy_stub_cnt);
1537 tty->print_cr(" _int_arraycopy_cnt: %d", _int_arraycopy_stub_cnt);
1538 tty->print_cr(" _long_arraycopy_cnt: %d", _long_arraycopy_stub_cnt);
1539 tty->print_cr(" _oop_arraycopy_cnt: %d", _oop_arraycopy_stub_cnt);
1540 tty->print_cr(" _arraycopy_slowcase_cnt: %d", _arraycopy_slowcase_cnt);
1541 tty->print_cr(" _arraycopy_checkcast_cnt: %d", _arraycopy_checkcast_cnt);
1542 tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt);
1543
1544 tty->print_cr(" _new_type_array_slowcase_cnt: %d", _new_type_array_slowcase_cnt);
1545 tty->print_cr(" _new_object_array_slowcase_cnt: %d", _new_object_array_slowcase_cnt);
1546 tty->print_cr(" _new_instance_slowcase_cnt: %d", _new_instance_slowcase_cnt);
1547 tty->print_cr(" _new_multi_array_slowcase_cnt: %d", _new_multi_array_slowcase_cnt);
1548 tty->print_cr(" _load_flattened_array_slowcase_cnt: %d", _load_flattened_array_slowcase_cnt);
1549 tty->print_cr(" _store_flattened_array_slowcase_cnt:%d", _store_flattened_array_slowcase_cnt);
1550 tty->print_cr(" _monitorenter_slowcase_cnt: %d", _monitorenter_slowcase_cnt);
1551 tty->print_cr(" _monitorexit_slowcase_cnt: %d", _monitorexit_slowcase_cnt);
1552 tty->print_cr(" _patch_code_slowcase_cnt: %d", _patch_code_slowcase_cnt);
1553
1554 tty->print_cr(" _throw_range_check_exception_count: %d:", _throw_range_check_exception_count);
1555 tty->print_cr(" _throw_index_exception_count: %d:", _throw_index_exception_count);
1556 tty->print_cr(" _throw_div0_exception_count: %d:", _throw_div0_exception_count);
1557 tty->print_cr(" _throw_null_pointer_exception_count: %d:", _throw_null_pointer_exception_count);
1558 tty->print_cr(" _throw_class_cast_exception_count: %d:", _throw_class_cast_exception_count);
1559 tty->print_cr(" _throw_incompatible_class_change_error_count: %d:", _throw_incompatible_class_change_error_count);
1560 tty->print_cr(" _throw_illegal_monitor_state_exception_count: %d:", _throw_illegal_monitor_state_exception_count);
1561 tty->print_cr(" _throw_array_store_exception_count: %d:", _throw_array_store_exception_count);
1562 tty->print_cr(" _throw_count: %d:", _throw_count);
1563
1564 SharedRuntime::print_ic_miss_histogram();
1565 tty->cr();
1566 }
1567 #endif // PRODUCT