1 /*
2 * Copyright (c) 1999, 2018, 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 "logging/log.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "oops/access.inline.hpp"
51 #include "oops/objArrayOop.inline.hpp"
52 #include "oops/objArrayKlass.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "runtime/atomic.hpp"
55 #include "runtime/biasedLocking.hpp"
56 #include "runtime/compilationPolicy.hpp"
57 #include "runtime/interfaceSupport.inline.hpp"
58 #include "runtime/frame.inline.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/vframe.inline.hpp"
63 #include "runtime/vframeArray.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "utilities/copy.hpp"
66 #include "utilities/events.hpp"
67
68
69 // Implementation of StubAssembler
70
71 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) {
72 _name = name;
73 _must_gc_arguments = false;
74 _frame_size = no_frame_size;
75 _num_rt_args = 0;
76 _stub_id = stub_id;
77 }
78
79
80 void StubAssembler::set_info(const char* name, bool must_gc_arguments) {
81 _name = name;
82 _must_gc_arguments = must_gc_arguments;
83 }
84
85
86 void StubAssembler::set_frame_size(int size) {
87 if (_frame_size == no_frame_size) {
88 _frame_size = size;
89 }
90 assert(_frame_size == size, "can't change the frame size");
91 }
92
93
94 void StubAssembler::set_num_rt_args(int args) {
95 if (_num_rt_args == 0) {
96 _num_rt_args = args;
97 }
98 assert(_num_rt_args == args, "can't change the number of args");
99 }
100
101 // Implementation of Runtime1
102
103 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids];
104 const char *Runtime1::_blob_names[] = {
105 RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME)
106 };
107
108 #ifndef PRODUCT
109 // statistics
110 int Runtime1::_generic_arraycopy_cnt = 0;
111 int Runtime1::_generic_arraycopystub_cnt = 0;
112 int Runtime1::_arraycopy_slowcase_cnt = 0;
113 int Runtime1::_arraycopy_checkcast_cnt = 0;
114 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0;
115 int Runtime1::_new_type_array_slowcase_cnt = 0;
116 int Runtime1::_new_object_array_slowcase_cnt = 0;
117 int Runtime1::_new_instance_slowcase_cnt = 0;
118 int Runtime1::_new_multi_array_slowcase_cnt = 0;
119 int Runtime1::_monitorenter_slowcase_cnt = 0;
120 int Runtime1::_monitorexit_slowcase_cnt = 0;
121 int Runtime1::_patch_code_slowcase_cnt = 0;
122 int Runtime1::_throw_range_check_exception_count = 0;
123 int Runtime1::_throw_index_exception_count = 0;
124 int Runtime1::_throw_div0_exception_count = 0;
125 int Runtime1::_throw_null_pointer_exception_count = 0;
126 int Runtime1::_throw_class_cast_exception_count = 0;
127 int Runtime1::_throw_incompatible_class_change_error_count = 0;
128 int Runtime1::_throw_array_store_exception_count = 0;
129 int Runtime1::_throw_count = 0;
130
131 static int _byte_arraycopy_stub_cnt = 0;
132 static int _short_arraycopy_stub_cnt = 0;
133 static int _int_arraycopy_stub_cnt = 0;
134 static int _long_arraycopy_stub_cnt = 0;
135 static int _oop_arraycopy_stub_cnt = 0;
136
137 address Runtime1::arraycopy_count_address(BasicType type) {
138 switch (type) {
139 case T_BOOLEAN:
140 case T_BYTE: return (address)&_byte_arraycopy_stub_cnt;
141 case T_CHAR:
142 case T_SHORT: return (address)&_short_arraycopy_stub_cnt;
143 case T_FLOAT:
144 case T_INT: return (address)&_int_arraycopy_stub_cnt;
145 case T_DOUBLE:
146 case T_LONG: return (address)&_long_arraycopy_stub_cnt;
147 case T_ARRAY:
148 case T_OBJECT: return (address)&_oop_arraycopy_stub_cnt;
149 default:
150 ShouldNotReachHere();
151 return NULL;
152 }
153 }
154
155
156 #endif
157
158 // Simple helper to see if the caller of a runtime stub which
159 // entered the VM has been deoptimized
160
161 static bool caller_is_deopted() {
162 JavaThread* thread = JavaThread::current();
163 RegisterMap reg_map(thread, false);
164 frame runtime_frame = thread->last_frame();
165 frame caller_frame = runtime_frame.sender(®_map);
166 assert(caller_frame.is_compiled_frame(), "must be compiled");
167 return caller_frame.is_deoptimized_frame();
168 }
169
170 // Stress deoptimization
171 static void deopt_caller() {
172 if ( !caller_is_deopted()) {
173 JavaThread* thread = JavaThread::current();
174 RegisterMap reg_map(thread, false);
175 frame runtime_frame = thread->last_frame();
176 frame caller_frame = runtime_frame.sender(®_map);
177 Deoptimization::deoptimize_frame(thread, caller_frame.id());
178 assert(caller_is_deopted(), "Must be deoptimized");
179 }
180 }
181
182 class StubIDStubAssemblerCodeGenClosure: public StubAssemblerCodeGenClosure {
183 private:
184 Runtime1::StubID _id;
185 public:
186 StubIDStubAssemblerCodeGenClosure(Runtime1::StubID id) : _id(id) {}
187 virtual OopMapSet* generate_code(StubAssembler* sasm) {
188 return Runtime1::generate_code_for(_id, sasm);
189 }
190 };
191
192 CodeBlob* Runtime1::generate_blob(BufferBlob* buffer_blob, int stub_id, const char* name, bool expect_oop_map, StubAssemblerCodeGenClosure* cl) {
193 ResourceMark rm;
194 // create code buffer for code storage
195 CodeBuffer code(buffer_blob);
196
197 OopMapSet* oop_maps;
198 int frame_size;
199 bool must_gc_arguments;
200
201 Compilation::setup_code_buffer(&code, 0);
202
203 // create assembler for code generation
204 StubAssembler* sasm = new StubAssembler(&code, name, stub_id);
205 // generate code for runtime stub
206 oop_maps = cl->generate_code(sasm);
207 assert(oop_maps == NULL || sasm->frame_size() != no_frame_size,
208 "if stub has an oop map it must have a valid frame size");
209 assert(!expect_oop_map || oop_maps != NULL, "must have an oopmap");
210
211 // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned)
212 sasm->align(BytesPerWord);
213 // make sure all code is in code buffer
214 sasm->flush();
215
216 frame_size = sasm->frame_size();
217 must_gc_arguments = sasm->must_gc_arguments();
218 // create blob - distinguish a few special cases
219 CodeBlob* blob = RuntimeStub::new_runtime_stub(name,
220 &code,
221 CodeOffsets::frame_never_safe,
222 frame_size,
223 oop_maps,
224 must_gc_arguments);
225 assert(blob != NULL, "blob must exist");
226 return blob;
227 }
228
229 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) {
230 assert(0 <= id && id < number_of_ids, "illegal stub id");
231 bool expect_oop_map = true;
232 #ifdef ASSERT
233 // Make sure that stubs that need oopmaps have them
234 switch (id) {
235 // These stubs don't need to have an oopmap
236 case dtrace_object_alloc_id:
237 case slow_subtype_check_id:
238 case fpu2long_stub_id:
239 case unwind_exception_id:
240 case counter_overflow_id:
241 #if defined(SPARC) || defined(PPC32)
242 case handle_exception_nofpu_id: // Unused on sparc
243 #endif
244 expect_oop_map = false;
245 break;
246 default:
247 break;
248 }
249 #endif
250 StubIDStubAssemblerCodeGenClosure cl(id);
251 CodeBlob* blob = generate_blob(buffer_blob, id, name_for(id), expect_oop_map, &cl);
252 // install blob
253 _blobs[id] = blob;
254 }
255
256 void Runtime1::initialize(BufferBlob* blob) {
257 // platform-dependent initialization
258 initialize_pd();
259 // generate stubs
260 for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id);
261 // printing
262 #ifndef PRODUCT
263 if (PrintSimpleStubs) {
264 ResourceMark rm;
265 for (int id = 0; id < number_of_ids; id++) {
266 _blobs[id]->print();
267 if (_blobs[id]->oop_maps() != NULL) {
268 _blobs[id]->oop_maps()->print();
269 }
270 }
271 }
272 #endif
273 BarrierSetC1* bs = BarrierSet::barrier_set()->barrier_set_c1();
274 bs->generate_c1_runtime_stubs(blob);
275 }
276
277 CodeBlob* Runtime1::blob_for(StubID id) {
278 assert(0 <= id && id < number_of_ids, "illegal stub id");
279 return _blobs[id];
280 }
281
282
283 const char* Runtime1::name_for(StubID id) {
284 assert(0 <= id && id < number_of_ids, "illegal stub id");
285 return _blob_names[id];
286 }
287
288 const char* Runtime1::name_for_address(address entry) {
289 for (int id = 0; id < number_of_ids; id++) {
290 if (entry == entry_for((StubID)id)) return name_for((StubID)id);
291 }
292
293 #define FUNCTION_CASE(a, f) \
294 if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f)) return #f
295
296 FUNCTION_CASE(entry, os::javaTimeMillis);
297 FUNCTION_CASE(entry, os::javaTimeNanos);
298 FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end);
299 FUNCTION_CASE(entry, SharedRuntime::d2f);
300 FUNCTION_CASE(entry, SharedRuntime::d2i);
301 FUNCTION_CASE(entry, SharedRuntime::d2l);
302 FUNCTION_CASE(entry, SharedRuntime::dcos);
303 FUNCTION_CASE(entry, SharedRuntime::dexp);
304 FUNCTION_CASE(entry, SharedRuntime::dlog);
305 FUNCTION_CASE(entry, SharedRuntime::dlog10);
306 FUNCTION_CASE(entry, SharedRuntime::dpow);
307 FUNCTION_CASE(entry, SharedRuntime::drem);
308 FUNCTION_CASE(entry, SharedRuntime::dsin);
309 FUNCTION_CASE(entry, SharedRuntime::dtan);
310 FUNCTION_CASE(entry, SharedRuntime::f2i);
311 FUNCTION_CASE(entry, SharedRuntime::f2l);
312 FUNCTION_CASE(entry, SharedRuntime::frem);
313 FUNCTION_CASE(entry, SharedRuntime::l2d);
314 FUNCTION_CASE(entry, SharedRuntime::l2f);
315 FUNCTION_CASE(entry, SharedRuntime::ldiv);
316 FUNCTION_CASE(entry, SharedRuntime::lmul);
317 FUNCTION_CASE(entry, SharedRuntime::lrem);
318 FUNCTION_CASE(entry, SharedRuntime::lrem);
319 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry);
320 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit);
321 FUNCTION_CASE(entry, is_instance_of);
322 FUNCTION_CASE(entry, trace_block_entry);
323 #ifdef TRACE_HAVE_INTRINSICS
324 FUNCTION_CASE(entry, TRACE_TIME_METHOD);
325 #endif
326 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32());
327 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32C());
328 FUNCTION_CASE(entry, StubRoutines::vectorizedMismatch());
329 FUNCTION_CASE(entry, StubRoutines::dexp());
330 FUNCTION_CASE(entry, StubRoutines::dlog());
331 FUNCTION_CASE(entry, StubRoutines::dlog10());
332 FUNCTION_CASE(entry, StubRoutines::dpow());
333 FUNCTION_CASE(entry, StubRoutines::dsin());
334 FUNCTION_CASE(entry, StubRoutines::dcos());
335 FUNCTION_CASE(entry, StubRoutines::dtan());
336
337 #undef FUNCTION_CASE
338
339 // Soft float adds more runtime names.
340 return pd_name_for_address(entry);
341 }
342
343
344 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, Klass* klass))
345 NOT_PRODUCT(_new_instance_slowcase_cnt++;)
346
347 assert(klass->is_klass(), "not a class");
348 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive
349 InstanceKlass* h = InstanceKlass::cast(klass);
350 h->check_valid_for_instantiation(true, CHECK);
351 // make sure klass is initialized
352 h->initialize(CHECK);
353 // allocate instance and return via TLS
354 oop obj = h->allocate_instance(CHECK);
355 thread->set_vm_result(obj);
356 JRT_END
357
358
359 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, Klass* klass, jint length))
360 NOT_PRODUCT(_new_type_array_slowcase_cnt++;)
361 // Note: no handle for klass needed since they are not used
362 // anymore after new_typeArray() and no GC can happen before.
363 // (This may have to change if this code changes!)
364 assert(klass->is_klass(), "not a class");
365 BasicType elt_type = TypeArrayKlass::cast(klass)->element_type();
366 oop obj = oopFactory::new_typeArray(elt_type, length, CHECK);
367 thread->set_vm_result(obj);
368 // This is pretty rare but this runtime patch is stressful to deoptimization
369 // if we deoptimize here so force a deopt to stress the path.
370 if (DeoptimizeALot) {
371 deopt_caller();
372 }
373
374 JRT_END
375
376
377 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, Klass* array_klass, jint length))
378 NOT_PRODUCT(_new_object_array_slowcase_cnt++;)
379
380 // Note: no handle for klass needed since they are not used
381 // anymore after new_objArray() and no GC can happen before.
382 // (This may have to change if this code changes!)
383 assert(array_klass->is_klass(), "not a class");
384 Handle holder(THREAD, array_klass->klass_holder()); // keep the klass alive
385 Klass* elem_klass = ObjArrayKlass::cast(array_klass)->element_klass();
386 objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK);
387 thread->set_vm_result(obj);
388 // This is pretty rare but this runtime patch is stressful to deoptimization
389 // if we deoptimize here so force a deopt to stress the path.
390 if (DeoptimizeALot) {
391 deopt_caller();
392 }
393 JRT_END
394
395
396 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims))
397 NOT_PRODUCT(_new_multi_array_slowcase_cnt++;)
398
399 assert(klass->is_klass(), "not a class");
400 assert(rank >= 1, "rank must be nonzero");
401 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive
402 oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK);
403 thread->set_vm_result(obj);
404 JRT_END
405
406
407 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id))
408 tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id);
409 JRT_END
410
411
412 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj))
413 ResourceMark rm(thread);
414 const char* klass_name = obj->klass()->external_name();
415 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name);
416 JRT_END
417
418
419 // counter_overflow() is called from within C1-compiled methods. The enclosing method is the method
420 // associated with the top activation record. The inlinee (that is possibly included in the enclosing
421 // method) method oop is passed as an argument. In order to do that it is embedded in the code as
422 // a constant.
423 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, Method* m) {
424 nmethod* osr_nm = NULL;
425 methodHandle method(THREAD, m);
426
427 RegisterMap map(THREAD, false);
428 frame fr = THREAD->last_frame().sender(&map);
429 nmethod* nm = (nmethod*) fr.cb();
430 assert(nm!= NULL && nm->is_nmethod(), "Sanity check");
431 methodHandle enclosing_method(THREAD, nm->method());
432
433 CompLevel level = (CompLevel)nm->comp_level();
434 int bci = InvocationEntryBci;
435 if (branch_bci != InvocationEntryBci) {
436 // Compute destination bci
437 address pc = method()->code_base() + branch_bci;
438 Bytecodes::Code branch = Bytecodes::code_at(method(), pc);
439 int offset = 0;
440 switch (branch) {
441 case Bytecodes::_if_icmplt: case Bytecodes::_iflt:
442 case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt:
443 case Bytecodes::_if_icmple: case Bytecodes::_ifle:
444 case Bytecodes::_if_icmpge: case Bytecodes::_ifge:
445 case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq:
446 case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne:
447 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto:
448 offset = (int16_t)Bytes::get_Java_u2(pc + 1);
449 break;
450 case Bytecodes::_goto_w:
451 offset = Bytes::get_Java_u4(pc + 1);
452 break;
453 default: ;
454 }
455 bci = branch_bci + offset;
456 }
457 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
458 osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, nm, THREAD);
459 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
460 return osr_nm;
461 }
462
463 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, Method* method))
464 nmethod* osr_nm;
465 JRT_BLOCK
466 osr_nm = counter_overflow_helper(thread, bci, method);
467 if (osr_nm != NULL) {
468 RegisterMap map(thread, false);
469 frame fr = thread->last_frame().sender(&map);
470 Deoptimization::deoptimize_frame(thread, fr.id());
471 }
472 JRT_BLOCK_END
473 return NULL;
474 JRT_END
475
476 extern void vm_exit(int code);
477
478 // Enter this method from compiled code handler below. This is where we transition
479 // to VM mode. This is done as a helper routine so that the method called directly
480 // from compiled code does not have to transition to VM. This allows the entry
481 // method to see if the nmethod that we have just looked up a handler for has
482 // been deoptimized while we were in the vm. This simplifies the assembly code
483 // cpu directories.
484 //
485 // We are entering here from exception stub (via the entry method below)
486 // If there is a compiled exception handler in this method, we will continue there;
487 // otherwise we will unwind the stack and continue at the caller of top frame method
488 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to
489 // control the area where we can allow a safepoint. After we exit the safepoint area we can
490 // check to see if the handler we are going to return is now in a nmethod that has
491 // been deoptimized. If that is the case we return the deopt blob
492 // unpack_with_exception entry instead. This makes life for the exception blob easier
493 // because making that same check and diverting is painful from assembly language.
494 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm))
495 // Reset method handle flag.
496 thread->set_is_method_handle_return(false);
497
498 Handle exception(thread, ex);
499 nm = CodeCache::find_nmethod(pc);
500 assert(nm != NULL, "this is not an nmethod");
501 // Adjust the pc as needed/
502 if (nm->is_deopt_pc(pc)) {
503 RegisterMap map(thread, false);
504 frame exception_frame = thread->last_frame().sender(&map);
505 // if the frame isn't deopted then pc must not correspond to the caller of last_frame
506 assert(exception_frame.is_deoptimized_frame(), "must be deopted");
507 pc = exception_frame.pc();
508 }
509 #ifdef ASSERT
510 assert(exception.not_null(), "NULL exceptions should be handled by throw_exception");
511 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
512 if (!(exception->is_a(SystemDictionary::Throwable_klass()))) {
513 if (ExitVMOnVerifyError) vm_exit(-1);
514 ShouldNotReachHere();
515 }
516 #endif
517
518 // Check the stack guard pages and reenable them if necessary and there is
519 // enough space on the stack to do so. Use fast exceptions only if the guard
520 // pages are enabled.
521 bool guard_pages_enabled = thread->stack_guards_enabled();
522 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
523
524 if (JvmtiExport::can_post_on_exceptions()) {
525 // To ensure correct notification of exception catches and throws
526 // we have to deoptimize here. If we attempted to notify the
527 // catches and throws during this exception lookup it's possible
528 // we could deoptimize on the way out of the VM and end back in
529 // the interpreter at the throw site. This would result in double
530 // notifications since the interpreter would also notify about
531 // these same catches and throws as it unwound the frame.
532
533 RegisterMap reg_map(thread);
534 frame stub_frame = thread->last_frame();
535 frame caller_frame = stub_frame.sender(®_map);
536
537 // We don't really want to deoptimize the nmethod itself since we
538 // can actually continue in the exception handler ourselves but I
539 // don't see an easy way to have the desired effect.
540 Deoptimization::deoptimize_frame(thread, caller_frame.id());
541 assert(caller_is_deopted(), "Must be deoptimized");
542
543 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
544 }
545
546 // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions
547 if (guard_pages_enabled) {
548 address fast_continuation = nm->handler_for_exception_and_pc(exception, pc);
549 if (fast_continuation != NULL) {
550 // Set flag if return address is a method handle call site.
551 thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
552 return fast_continuation;
553 }
554 }
555
556 // If the stack guard pages are enabled, check whether there is a handler in
557 // the current method. Otherwise (guard pages disabled), force an unwind and
558 // skip the exception cache update (i.e., just leave continuation==NULL).
559 address continuation = NULL;
560 if (guard_pages_enabled) {
561
562 // New exception handling mechanism can support inlined methods
563 // with exception handlers since the mappings are from PC to PC
564
565 // debugging support
566 // tracing
567 if (log_is_enabled(Info, exceptions)) {
568 ResourceMark rm;
569 stringStream tempst;
570 tempst.print("compiled method <%s>\n"
571 " at PC" INTPTR_FORMAT " for thread " INTPTR_FORMAT,
572 nm->method()->print_value_string(), p2i(pc), p2i(thread));
573 Exceptions::log_exception(exception, tempst);
574 }
575 // for AbortVMOnException flag
576 Exceptions::debug_check_abort(exception);
577
578 // Clear out the exception oop and pc since looking up an
579 // exception handler can cause class loading, which might throw an
580 // exception and those fields are expected to be clear during
581 // normal bytecode execution.
582 thread->clear_exception_oop_and_pc();
583
584 bool recursive_exception = false;
585 continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false, recursive_exception);
586 // If an exception was thrown during exception dispatch, the exception oop may have changed
587 thread->set_exception_oop(exception());
588 thread->set_exception_pc(pc);
589
590 // the exception cache is used only by non-implicit exceptions
591 // Update the exception cache only when there didn't happen
592 // another exception during the computation of the compiled
593 // exception handler. Checking for exception oop equality is not
594 // sufficient because some exceptions are pre-allocated and reused.
595 if (continuation != NULL && !recursive_exception) {
596 nm->add_handler_for_exception_and_pc(exception, pc, continuation);
597 }
598 }
599
600 thread->set_vm_result(exception());
601 // Set flag if return address is a method handle call site.
602 thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
603
604 if (log_is_enabled(Info, exceptions)) {
605 ResourceMark rm;
606 log_info(exceptions)("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT
607 " for exception thrown at PC " PTR_FORMAT,
608 p2i(thread), p2i(continuation), p2i(pc));
609 }
610
611 return continuation;
612 JRT_END
613
614 // Enter this method from compiled code only if there is a Java exception handler
615 // in the method handling the exception.
616 // We are entering here from exception stub. We don't do a normal VM transition here.
617 // We do it in a helper. This is so we can check to see if the nmethod we have just
618 // searched for an exception handler has been deoptimized in the meantime.
619 address Runtime1::exception_handler_for_pc(JavaThread* thread) {
620 oop exception = thread->exception_oop();
621 address pc = thread->exception_pc();
622 // Still in Java mode
623 DEBUG_ONLY(ResetNoHandleMark rnhm);
624 nmethod* nm = NULL;
625 address continuation = NULL;
626 {
627 // Enter VM mode by calling the helper
628 ResetNoHandleMark rnhm;
629 continuation = exception_handler_for_pc_helper(thread, exception, pc, nm);
630 }
631 // Back in JAVA, use no oops DON'T safepoint
632
633 // Now check to see if the nmethod we were called from is now deoptimized.
634 // If so we must return to the deopt blob and deoptimize the nmethod
635 if (nm != NULL && caller_is_deopted()) {
636 continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
637 }
638
639 assert(continuation != NULL, "no handler found");
640 return continuation;
641 }
642
643
644 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index))
645 NOT_PRODUCT(_throw_range_check_exception_count++;)
646 char message[jintAsStringSize];
647 sprintf(message, "%d", index);
648 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message);
649 JRT_END
650
651
652 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index))
653 NOT_PRODUCT(_throw_index_exception_count++;)
654 char message[16];
655 sprintf(message, "%d", index);
656 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message);
657 JRT_END
658
659
660 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread))
661 NOT_PRODUCT(_throw_div0_exception_count++;)
662 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
663 JRT_END
664
665
666 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread))
667 NOT_PRODUCT(_throw_null_pointer_exception_count++;)
668 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
669 JRT_END
670
671
672 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object))
673 NOT_PRODUCT(_throw_class_cast_exception_count++;)
674 ResourceMark rm(thread);
675 char* message = SharedRuntime::generate_class_cast_message(
676 thread, object->klass());
677 SharedRuntime::throw_and_post_jvmti_exception(
678 thread, vmSymbols::java_lang_ClassCastException(), message);
679 JRT_END
680
681
682 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread))
683 NOT_PRODUCT(_throw_incompatible_class_change_error_count++;)
684 ResourceMark rm(thread);
685 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError());
686 JRT_END
687
688
689 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock))
690 NOT_PRODUCT(_monitorenter_slowcase_cnt++;)
691 if (PrintBiasedLockingStatistics) {
692 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
693 }
694 Handle h_obj(thread, obj);
695 if (UseBiasedLocking) {
696 // Retry fast entry if bias is revoked to avoid unnecessary inflation
697 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK);
698 } else {
699 if (UseFastLocking) {
700 // When using fast locking, the compiled code has already tried the fast case
701 assert(obj == lock->obj(), "must match");
702 ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD);
703 } else {
704 lock->set_obj(obj);
705 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD);
706 }
707 }
708 JRT_END
709
710
711 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock))
712 NOT_PRODUCT(_monitorexit_slowcase_cnt++;)
713 assert(thread == JavaThread::current(), "threads must correspond");
714 assert(thread->last_Java_sp(), "last_Java_sp must be set");
715 // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown
716 EXCEPTION_MARK;
717
718 oop obj = lock->obj();
719 assert(oopDesc::is_oop(obj), "must be NULL or an object");
720 if (UseFastLocking) {
721 // When using fast locking, the compiled code has already tried the fast case
722 ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD);
723 } else {
724 ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD);
725 }
726 JRT_END
727
728 // Cf. OptoRuntime::deoptimize_caller_frame
729 JRT_ENTRY(void, Runtime1::deoptimize(JavaThread* thread, jint trap_request))
730 // Called from within the owner thread, so no need for safepoint
731 RegisterMap reg_map(thread, false);
732 frame stub_frame = thread->last_frame();
733 assert(stub_frame.is_runtime_frame(), "Sanity check");
734 frame caller_frame = stub_frame.sender(®_map);
735 nmethod* nm = caller_frame.cb()->as_nmethod_or_null();
736 assert(nm != NULL, "Sanity check");
737 methodHandle method(thread, nm->method());
738 assert(nm == CodeCache::find_nmethod(caller_frame.pc()), "Should be the same");
739 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request);
740 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request);
741
742 if (action == Deoptimization::Action_make_not_entrant) {
743 if (nm->make_not_entrant()) {
744 if (reason == Deoptimization::Reason_tenured) {
745 MethodData* trap_mdo = Deoptimization::get_method_data(thread, method, true /*create_if_missing*/);
746 if (trap_mdo != NULL) {
747 trap_mdo->inc_tenure_traps();
748 }
749 }
750 }
751 }
752
753 // Deoptimize the caller frame.
754 Deoptimization::deoptimize_frame(thread, caller_frame.id());
755 // Return to the now deoptimized frame.
756 JRT_END
757
758
759 #ifndef DEOPTIMIZE_WHEN_PATCHING
760
761 static Klass* resolve_field_return_klass(const methodHandle& caller, int bci, TRAPS) {
762 Bytecode_field field_access(caller, bci);
763 // This can be static or non-static field access
764 Bytecodes::Code code = field_access.code();
765
766 // We must load class, initialize class and resolve the field
767 fieldDescriptor result; // initialize class if needed
768 constantPoolHandle constants(THREAD, caller->constants());
769 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller, Bytecodes::java_code(code), CHECK_NULL);
770 return result.field_holder();
771 }
772
773
774 //
775 // This routine patches sites where a class wasn't loaded or
776 // initialized at the time the code was generated. It handles
777 // references to classes, fields and forcing of initialization. Most
778 // of the cases are straightforward and involving simply forcing
779 // resolution of a class, rewriting the instruction stream with the
780 // needed constant and replacing the call in this function with the
781 // patched code. The case for static field is more complicated since
782 // the thread which is in the process of initializing a class can
783 // access it's static fields but other threads can't so the code
784 // either has to deoptimize when this case is detected or execute a
785 // check that the current thread is the initializing thread. The
786 // current
787 //
788 // Patches basically look like this:
789 //
790 //
791 // patch_site: jmp patch stub ;; will be patched
792 // continue: ...
793 // ...
794 // ...
795 // ...
796 //
797 // They have a stub which looks like this:
798 //
799 // ;; patch body
800 // movl <const>, reg (for class constants)
801 // <or> movl [reg1 + <const>], reg (for field offsets)
802 // <or> movl reg, [reg1 + <const>] (for field offsets)
803 // <being_init offset> <bytes to copy> <bytes to skip>
804 // patch_stub: call Runtime1::patch_code (through a runtime stub)
805 // jmp patch_site
806 //
807 //
808 // A normal patch is done by rewriting the patch body, usually a move,
809 // and then copying it into place over top of the jmp instruction
810 // being careful to flush caches and doing it in an MP-safe way. The
811 // constants following the patch body are used to find various pieces
812 // of the patch relative to the call site for Runtime1::patch_code.
813 // The case for getstatic and putstatic is more complicated because
814 // getstatic and putstatic have special semantics when executing while
815 // the class is being initialized. getstatic/putstatic on a class
816 // which is being_initialized may be executed by the initializing
817 // thread but other threads have to block when they execute it. This
818 // is accomplished in compiled code by executing a test of the current
819 // thread against the initializing thread of the class. It's emitted
820 // as boilerplate in their stub which allows the patched code to be
821 // executed before it's copied back into the main body of the nmethod.
822 //
823 // being_init: get_thread(<tmp reg>
824 // cmpl [reg1 + <init_thread_offset>], <tmp reg>
825 // jne patch_stub
826 // movl [reg1 + <const>], reg (for field offsets) <or>
827 // movl reg, [reg1 + <const>] (for field offsets)
828 // jmp continue
829 // <being_init offset> <bytes to copy> <bytes to skip>
830 // patch_stub: jmp Runtim1::patch_code (through a runtime stub)
831 // jmp patch_site
832 //
833 // If the class is being initialized the patch body is rewritten and
834 // the patch site is rewritten to jump to being_init, instead of
835 // patch_stub. Whenever this code is executed it checks the current
836 // thread against the intializing thread so other threads will enter
837 // the runtime and end up blocked waiting the class to finish
838 // initializing inside the calls to resolve_field below. The
839 // initializing class will continue on it's way. Once the class is
840 // fully_initialized, the intializing_thread of the class becomes
841 // NULL, so the next thread to execute this code will fail the test,
842 // call into patch_code and complete the patching process by copying
843 // the patch body back into the main part of the nmethod and resume
844 // executing.
845 //
846 //
847
848 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))
849 NOT_PRODUCT(_patch_code_slowcase_cnt++;)
850
851 ResourceMark rm(thread);
852 RegisterMap reg_map(thread, false);
853 frame runtime_frame = thread->last_frame();
854 frame caller_frame = runtime_frame.sender(®_map);
855
856 // last java frame on stack
857 vframeStream vfst(thread, true);
858 assert(!vfst.at_end(), "Java frame must exist");
859
860 methodHandle caller_method(THREAD, vfst.method());
861 // Note that caller_method->code() may not be same as caller_code because of OSR's
862 // Note also that in the presence of inlining it is not guaranteed
863 // that caller_method() == caller_code->method()
864
865 int bci = vfst.bci();
866 Bytecodes::Code code = caller_method()->java_code_at(bci);
867
868 // this is used by assertions in the access_field_patching_id
869 BasicType patch_field_type = T_ILLEGAL;
870 bool deoptimize_for_volatile = false;
871 bool deoptimize_for_atomic = false;
872 int patch_field_offset = -1;
873 Klass* init_klass = NULL; // klass needed by load_klass_patching code
874 Klass* load_klass = NULL; // klass needed by load_klass_patching code
875 Handle mirror(THREAD, NULL); // oop needed by load_mirror_patching code
876 Handle appendix(THREAD, NULL); // oop needed by appendix_patching code
877 bool load_klass_or_mirror_patch_id =
878 (stub_id == Runtime1::load_klass_patching_id || stub_id == Runtime1::load_mirror_patching_id);
879
880 if (stub_id == Runtime1::access_field_patching_id) {
881
882 Bytecode_field field_access(caller_method, bci);
883 fieldDescriptor result; // initialize class if needed
884 Bytecodes::Code code = field_access.code();
885 constantPoolHandle constants(THREAD, caller_method->constants());
886 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller_method, Bytecodes::java_code(code), CHECK);
887 patch_field_offset = result.offset();
888
889 // If we're patching a field which is volatile then at compile it
890 // must not have been know to be volatile, so the generated code
891 // isn't correct for a volatile reference. The nmethod has to be
892 // deoptimized so that the code can be regenerated correctly.
893 // This check is only needed for access_field_patching since this
894 // is the path for patching field offsets. load_klass is only
895 // used for patching references to oops which don't need special
896 // handling in the volatile case.
897
898 deoptimize_for_volatile = result.access_flags().is_volatile();
899
900 // If we are patching a field which should be atomic, then
901 // the generated code is not correct either, force deoptimizing.
902 // We need to only cover T_LONG and T_DOUBLE fields, as we can
903 // break access atomicity only for them.
904
905 // Strictly speaking, the deoptimizaation on 64-bit platforms
906 // is unnecessary, and T_LONG stores on 32-bit platforms need
907 // to be handled by special patching code when AlwaysAtomicAccesses
908 // becomes product feature. At this point, we are still going
909 // for the deoptimization for consistency against volatile
910 // accesses.
911
912 patch_field_type = result.field_type();
913 deoptimize_for_atomic = (AlwaysAtomicAccesses && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG));
914
915 } else if (load_klass_or_mirror_patch_id) {
916 Klass* k = NULL;
917 switch (code) {
918 case Bytecodes::_putstatic:
919 case Bytecodes::_getstatic:
920 { Klass* klass = resolve_field_return_klass(caller_method, bci, CHECK);
921 init_klass = klass;
922 mirror = Handle(THREAD, klass->java_mirror());
923 }
924 break;
925 case Bytecodes::_new:
926 { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci));
927 k = caller_method->constants()->klass_at(bnew.index(), CHECK);
928 }
929 break;
930 case Bytecodes::_multianewarray:
931 { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci));
932 k = caller_method->constants()->klass_at(mna.index(), CHECK);
933 }
934 break;
935 case Bytecodes::_instanceof:
936 { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci));
937 k = caller_method->constants()->klass_at(io.index(), CHECK);
938 }
939 break;
940 case Bytecodes::_checkcast:
941 { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci));
942 k = caller_method->constants()->klass_at(cc.index(), CHECK);
943 }
944 break;
945 case Bytecodes::_anewarray:
946 { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci));
947 Klass* ek = caller_method->constants()->klass_at(anew.index(), CHECK);
948 k = ek->array_klass(CHECK);
949 }
950 break;
951 case Bytecodes::_ldc:
952 case Bytecodes::_ldc_w:
953 {
954 Bytecode_loadconstant cc(caller_method, bci);
955 oop m = cc.resolve_constant(CHECK);
956 mirror = Handle(THREAD, m);
957 }
958 break;
959 default: fatal("unexpected bytecode for load_klass_or_mirror_patch_id");
960 }
961 load_klass = k;
962 } else if (stub_id == load_appendix_patching_id) {
963 Bytecode_invoke bytecode(caller_method, bci);
964 Bytecodes::Code bc = bytecode.invoke_code();
965
966 CallInfo info;
967 constantPoolHandle pool(thread, caller_method->constants());
968 int index = bytecode.index();
969 LinkResolver::resolve_invoke(info, Handle(), pool, index, bc, CHECK);
970 switch (bc) {
971 case Bytecodes::_invokehandle: {
972 int cache_index = ConstantPool::decode_cpcache_index(index, true);
973 assert(cache_index >= 0 && cache_index < pool->cache()->length(), "unexpected cache index");
974 ConstantPoolCacheEntry* cpce = pool->cache()->entry_at(cache_index);
975 cpce->set_method_handle(pool, info);
976 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry
977 break;
978 }
979 case Bytecodes::_invokedynamic: {
980 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
981 cpce->set_dynamic_call(pool, info);
982 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry
983 break;
984 }
985 default: fatal("unexpected bytecode for load_appendix_patching_id");
986 }
987 } else {
988 ShouldNotReachHere();
989 }
990
991 if (deoptimize_for_volatile || deoptimize_for_atomic) {
992 // At compile time we assumed the field wasn't volatile/atomic but after
993 // loading it turns out it was volatile/atomic so we have to throw the
994 // compiled code out and let it be regenerated.
995 if (TracePatching) {
996 if (deoptimize_for_volatile) {
997 tty->print_cr("Deoptimizing for patching volatile field reference");
998 }
999 if (deoptimize_for_atomic) {
1000 tty->print_cr("Deoptimizing for patching atomic field reference");
1001 }
1002 }
1003
1004 // It's possible the nmethod was invalidated in the last
1005 // safepoint, but if it's still alive then make it not_entrant.
1006 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1007 if (nm != NULL) {
1008 nm->make_not_entrant();
1009 }
1010
1011 Deoptimization::deoptimize_frame(thread, caller_frame.id());
1012
1013 // Return to the now deoptimized frame.
1014 }
1015
1016 // Now copy code back
1017
1018 {
1019 MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag);
1020 //
1021 // Deoptimization may have happened while we waited for the lock.
1022 // In that case we don't bother to do any patching we just return
1023 // and let the deopt happen
1024 if (!caller_is_deopted()) {
1025 NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc());
1026 address instr_pc = jump->jump_destination();
1027 NativeInstruction* ni = nativeInstruction_at(instr_pc);
1028 if (ni->is_jump() ) {
1029 // the jump has not been patched yet
1030 // The jump destination is slow case and therefore not part of the stubs
1031 // (stubs are only for StaticCalls)
1032
1033 // format of buffer
1034 // ....
1035 // instr byte 0 <-- copy_buff
1036 // instr byte 1
1037 // ..
1038 // instr byte n-1
1039 // n
1040 // .... <-- call destination
1041
1042 address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset();
1043 unsigned char* byte_count = (unsigned char*) (stub_location - 1);
1044 unsigned char* byte_skip = (unsigned char*) (stub_location - 2);
1045 unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3);
1046 address copy_buff = stub_location - *byte_skip - *byte_count;
1047 address being_initialized_entry = stub_location - *being_initialized_entry_offset;
1048 if (TracePatching) {
1049 ttyLocker ttyl;
1050 tty->print_cr(" Patching %s at bci %d at address " INTPTR_FORMAT " (%s)", Bytecodes::name(code), bci,
1051 p2i(instr_pc), (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass");
1052 nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc());
1053 assert(caller_code != NULL, "nmethod not found");
1054
1055 // NOTE we use pc() not original_pc() because we already know they are
1056 // identical otherwise we'd have never entered this block of code
1057
1058 const ImmutableOopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc());
1059 assert(map != NULL, "null check");
1060 map->print();
1061 tty->cr();
1062
1063 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1064 }
1065 // depending on the code below, do_patch says whether to copy the patch body back into the nmethod
1066 bool do_patch = true;
1067 if (stub_id == Runtime1::access_field_patching_id) {
1068 // The offset may not be correct if the class was not loaded at code generation time.
1069 // Set it now.
1070 NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff);
1071 assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type");
1072 assert(patch_field_offset >= 0, "illegal offset");
1073 n_move->add_offset_in_bytes(patch_field_offset);
1074 } else if (load_klass_or_mirror_patch_id) {
1075 // If a getstatic or putstatic is referencing a klass which
1076 // isn't fully initialized, the patch body isn't copied into
1077 // place until initialization is complete. In this case the
1078 // patch site is setup so that any threads besides the
1079 // initializing thread are forced to come into the VM and
1080 // block.
1081 do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) ||
1082 InstanceKlass::cast(init_klass)->is_initialized();
1083 NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc);
1084 if (jump->jump_destination() == being_initialized_entry) {
1085 assert(do_patch == true, "initialization must be complete at this point");
1086 } else {
1087 // patch the instruction <move reg, klass>
1088 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
1089
1090 assert(n_copy->data() == 0 ||
1091 n_copy->data() == (intptr_t)Universe::non_oop_word(),
1092 "illegal init value");
1093 if (stub_id == Runtime1::load_klass_patching_id) {
1094 assert(load_klass != NULL, "klass not set");
1095 n_copy->set_data((intx) (load_klass));
1096 } else {
1097 assert(mirror() != NULL, "klass not set");
1098 // Don't need a G1 pre-barrier here since we assert above that data isn't an oop.
1099 n_copy->set_data(cast_from_oop<intx>(mirror()));
1100 }
1101
1102 if (TracePatching) {
1103 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1104 }
1105 }
1106 } else if (stub_id == Runtime1::load_appendix_patching_id) {
1107 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
1108 assert(n_copy->data() == 0 ||
1109 n_copy->data() == (intptr_t)Universe::non_oop_word(),
1110 "illegal init value");
1111 n_copy->set_data(cast_from_oop<intx>(appendix()));
1112
1113 if (TracePatching) {
1114 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1115 }
1116 } else {
1117 ShouldNotReachHere();
1118 }
1119
1120 #if defined(SPARC) || defined(PPC32)
1121 if (load_klass_or_mirror_patch_id ||
1122 stub_id == Runtime1::load_appendix_patching_id) {
1123 // Update the location in the nmethod with the proper
1124 // metadata. When the code was generated, a NULL was stuffed
1125 // in the metadata table and that table needs to be update to
1126 // have the right value. On intel the value is kept
1127 // directly in the instruction instead of in the metadata
1128 // table, so set_data above effectively updated the value.
1129 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1130 assert(nm != NULL, "invalid nmethod_pc");
1131 RelocIterator mds(nm, copy_buff, copy_buff + 1);
1132 bool found = false;
1133 while (mds.next() && !found) {
1134 if (mds.type() == relocInfo::oop_type) {
1135 assert(stub_id == Runtime1::load_mirror_patching_id ||
1136 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id");
1137 oop_Relocation* r = mds.oop_reloc();
1138 oop* oop_adr = r->oop_addr();
1139 *oop_adr = stub_id == Runtime1::load_mirror_patching_id ? mirror() : appendix();
1140 r->fix_oop_relocation();
1141 found = true;
1142 } else if (mds.type() == relocInfo::metadata_type) {
1143 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id");
1144 metadata_Relocation* r = mds.metadata_reloc();
1145 Metadata** metadata_adr = r->metadata_addr();
1146 *metadata_adr = load_klass;
1147 r->fix_metadata_relocation();
1148 found = true;
1149 }
1150 }
1151 assert(found, "the metadata must exist!");
1152 }
1153 #endif
1154 if (do_patch) {
1155 // replace instructions
1156 // first replace the tail, then the call
1157 #ifdef ARM
1158 if((load_klass_or_mirror_patch_id ||
1159 stub_id == Runtime1::load_appendix_patching_id) &&
1160 nativeMovConstReg_at(copy_buff)->is_pc_relative()) {
1161 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1162 address addr = NULL;
1163 assert(nm != NULL, "invalid nmethod_pc");
1164 RelocIterator mds(nm, copy_buff, copy_buff + 1);
1165 while (mds.next()) {
1166 if (mds.type() == relocInfo::oop_type) {
1167 assert(stub_id == Runtime1::load_mirror_patching_id ||
1168 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id");
1169 oop_Relocation* r = mds.oop_reloc();
1170 addr = (address)r->oop_addr();
1171 break;
1172 } else if (mds.type() == relocInfo::metadata_type) {
1173 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id");
1174 metadata_Relocation* r = mds.metadata_reloc();
1175 addr = (address)r->metadata_addr();
1176 break;
1177 }
1178 }
1179 assert(addr != NULL, "metadata relocation must exist");
1180 copy_buff -= *byte_count;
1181 NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff);
1182 n_copy2->set_pc_relative_offset(addr, instr_pc);
1183 }
1184 #endif
1185
1186 for (int i = NativeGeneralJump::instruction_size; i < *byte_count; i++) {
1187 address ptr = copy_buff + i;
1188 int a_byte = (*ptr) & 0xFF;
1189 address dst = instr_pc + i;
1190 *(unsigned char*)dst = (unsigned char) a_byte;
1191 }
1192 ICache::invalidate_range(instr_pc, *byte_count);
1193 NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff);
1194
1195 if (load_klass_or_mirror_patch_id ||
1196 stub_id == Runtime1::load_appendix_patching_id) {
1197 relocInfo::relocType rtype =
1198 (stub_id == Runtime1::load_klass_patching_id) ?
1199 relocInfo::metadata_type :
1200 relocInfo::oop_type;
1201 // update relocInfo to metadata
1202 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1203 assert(nm != NULL, "invalid nmethod_pc");
1204
1205 // The old patch site is now a move instruction so update
1206 // the reloc info so that it will get updated during
1207 // future GCs.
1208 RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1));
1209 relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc,
1210 relocInfo::none, rtype);
1211 #ifdef SPARC
1212 // Sparc takes two relocations for an metadata so update the second one.
1213 address instr_pc2 = instr_pc + NativeMovConstReg::add_offset;
1214 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
1215 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
1216 relocInfo::none, rtype);
1217 #endif
1218 #ifdef PPC32
1219 { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset;
1220 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
1221 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
1222 relocInfo::none, rtype);
1223 }
1224 #endif
1225 }
1226
1227 } else {
1228 ICache::invalidate_range(copy_buff, *byte_count);
1229 NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry);
1230 }
1231 }
1232 }
1233 }
1234
1235 // If we are patching in a non-perm oop, make sure the nmethod
1236 // is on the right list.
1237 if (ScavengeRootsInCode) {
1238 MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag);
1239 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1240 guarantee(nm != NULL, "only nmethods can contain non-perm oops");
1241
1242 // Since we've patched some oops in the nmethod,
1243 // (re)register it with the heap.
1244 Universe::heap()->register_nmethod(nm);
1245 }
1246 JRT_END
1247
1248 #else // DEOPTIMIZE_WHEN_PATCHING
1249
1250 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))
1251 RegisterMap reg_map(thread, false);
1252
1253 NOT_PRODUCT(_patch_code_slowcase_cnt++;)
1254 if (TracePatching) {
1255 tty->print_cr("Deoptimizing because patch is needed");
1256 }
1257
1258 frame runtime_frame = thread->last_frame();
1259 frame caller_frame = runtime_frame.sender(®_map);
1260
1261 // It's possible the nmethod was invalidated in the last
1262 // safepoint, but if it's still alive then make it not_entrant.
1263 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1264 if (nm != NULL) {
1265 nm->make_not_entrant();
1266 }
1267
1268 Deoptimization::deoptimize_frame(thread, caller_frame.id());
1269
1270 // Return to the now deoptimized frame.
1271 JRT_END
1272
1273 #endif // DEOPTIMIZE_WHEN_PATCHING
1274
1275 //
1276 // Entry point for compiled code. We want to patch a nmethod.
1277 // We don't do a normal VM transition here because we want to
1278 // know after the patching is complete and any safepoint(s) are taken
1279 // if the calling nmethod was deoptimized. We do this by calling a
1280 // helper method which does the normal VM transition and when it
1281 // completes we can check for deoptimization. This simplifies the
1282 // assembly code in the cpu directories.
1283 //
1284 int Runtime1::move_klass_patching(JavaThread* thread) {
1285 //
1286 // NOTE: we are still in Java
1287 //
1288 Thread* THREAD = thread;
1289 debug_only(NoHandleMark nhm;)
1290 {
1291 // Enter VM mode
1292
1293 ResetNoHandleMark rnhm;
1294 patch_code(thread, load_klass_patching_id);
1295 }
1296 // Back in JAVA, use no oops DON'T safepoint
1297
1298 // Return true if calling code is deoptimized
1299
1300 return caller_is_deopted();
1301 }
1302
1303 int Runtime1::move_mirror_patching(JavaThread* thread) {
1304 //
1305 // NOTE: we are still in Java
1306 //
1307 Thread* THREAD = thread;
1308 debug_only(NoHandleMark nhm;)
1309 {
1310 // Enter VM mode
1311
1312 ResetNoHandleMark rnhm;
1313 patch_code(thread, load_mirror_patching_id);
1314 }
1315 // Back in JAVA, use no oops DON'T safepoint
1316
1317 // Return true if calling code is deoptimized
1318
1319 return caller_is_deopted();
1320 }
1321
1322 int Runtime1::move_appendix_patching(JavaThread* thread) {
1323 //
1324 // NOTE: we are still in Java
1325 //
1326 Thread* THREAD = thread;
1327 debug_only(NoHandleMark nhm;)
1328 {
1329 // Enter VM mode
1330
1331 ResetNoHandleMark rnhm;
1332 patch_code(thread, load_appendix_patching_id);
1333 }
1334 // Back in JAVA, use no oops DON'T safepoint
1335
1336 // Return true if calling code is deoptimized
1337
1338 return caller_is_deopted();
1339 }
1340 //
1341 // Entry point for compiled code. We want to patch a nmethod.
1342 // We don't do a normal VM transition here because we want to
1343 // know after the patching is complete and any safepoint(s) are taken
1344 // if the calling nmethod was deoptimized. We do this by calling a
1345 // helper method which does the normal VM transition and when it
1346 // completes we can check for deoptimization. This simplifies the
1347 // assembly code in the cpu directories.
1348 //
1349
1350 int Runtime1::access_field_patching(JavaThread* thread) {
1351 //
1352 // NOTE: we are still in Java
1353 //
1354 Thread* THREAD = thread;
1355 debug_only(NoHandleMark nhm;)
1356 {
1357 // Enter VM mode
1358
1359 ResetNoHandleMark rnhm;
1360 patch_code(thread, access_field_patching_id);
1361 }
1362 // Back in JAVA, use no oops DON'T safepoint
1363
1364 // Return true if calling code is deoptimized
1365
1366 return caller_is_deopted();
1367 JRT_END
1368
1369
1370 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id))
1371 // for now we just print out the block id
1372 tty->print("%d ", block_id);
1373 JRT_END
1374
1375
1376 JRT_LEAF(int, Runtime1::is_instance_of(oopDesc* mirror, oopDesc* obj))
1377 // had to return int instead of bool, otherwise there may be a mismatch
1378 // between the C calling convention and the Java one.
1379 // e.g., on x86, GCC may clear only %al when returning a bool false, but
1380 // JVM takes the whole %eax as the return value, which may misinterpret
1381 // the return value as a boolean true.
1382
1383 assert(mirror != NULL, "should null-check on mirror before calling");
1384 Klass* k = java_lang_Class::as_Klass(mirror);
1385 return (k != NULL && obj != NULL && obj->is_a(k)) ? 1 : 0;
1386 JRT_END
1387
1388 JRT_ENTRY(void, Runtime1::predicate_failed_trap(JavaThread* thread))
1389 ResourceMark rm;
1390
1391 assert(!TieredCompilation, "incompatible with tiered compilation");
1392
1393 RegisterMap reg_map(thread, false);
1394 frame runtime_frame = thread->last_frame();
1395 frame caller_frame = runtime_frame.sender(®_map);
1396
1397 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1398 assert (nm != NULL, "no more nmethod?");
1399 nm->make_not_entrant();
1400
1401 methodHandle m(nm->method());
1402 MethodData* mdo = m->method_data();
1403
1404 if (mdo == NULL && !HAS_PENDING_EXCEPTION) {
1405 // Build an MDO. Ignore errors like OutOfMemory;
1406 // that simply means we won't have an MDO to update.
1407 Method::build_interpreter_method_data(m, THREAD);
1408 if (HAS_PENDING_EXCEPTION) {
1409 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1410 CLEAR_PENDING_EXCEPTION;
1411 }
1412 mdo = m->method_data();
1413 }
1414
1415 if (mdo != NULL) {
1416 mdo->inc_trap_count(Deoptimization::Reason_none);
1417 }
1418
1419 if (TracePredicateFailedTraps) {
1420 stringStream ss1, ss2;
1421 vframeStream vfst(thread);
1422 methodHandle inlinee = methodHandle(vfst.method());
1423 inlinee->print_short_name(&ss1);
1424 m->print_short_name(&ss2);
1425 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()));
1426 }
1427
1428
1429 Deoptimization::deoptimize_frame(thread, caller_frame.id());
1430
1431 JRT_END
1432
1433 #ifndef PRODUCT
1434 void Runtime1::print_statistics() {
1435 tty->print_cr("C1 Runtime statistics:");
1436 tty->print_cr(" _resolve_invoke_virtual_cnt: %d", SharedRuntime::_resolve_virtual_ctr);
1437 tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr);
1438 tty->print_cr(" _resolve_invoke_static_cnt: %d", SharedRuntime::_resolve_static_ctr);
1439 tty->print_cr(" _handle_wrong_method_cnt: %d", SharedRuntime::_wrong_method_ctr);
1440 tty->print_cr(" _ic_miss_cnt: %d", SharedRuntime::_ic_miss_ctr);
1441 tty->print_cr(" _generic_arraycopy_cnt: %d", _generic_arraycopy_cnt);
1442 tty->print_cr(" _generic_arraycopystub_cnt: %d", _generic_arraycopystub_cnt);
1443 tty->print_cr(" _byte_arraycopy_cnt: %d", _byte_arraycopy_stub_cnt);
1444 tty->print_cr(" _short_arraycopy_cnt: %d", _short_arraycopy_stub_cnt);
1445 tty->print_cr(" _int_arraycopy_cnt: %d", _int_arraycopy_stub_cnt);
1446 tty->print_cr(" _long_arraycopy_cnt: %d", _long_arraycopy_stub_cnt);
1447 tty->print_cr(" _oop_arraycopy_cnt: %d", _oop_arraycopy_stub_cnt);
1448 tty->print_cr(" _arraycopy_slowcase_cnt: %d", _arraycopy_slowcase_cnt);
1449 tty->print_cr(" _arraycopy_checkcast_cnt: %d", _arraycopy_checkcast_cnt);
1450 tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt);
1451
1452 tty->print_cr(" _new_type_array_slowcase_cnt: %d", _new_type_array_slowcase_cnt);
1453 tty->print_cr(" _new_object_array_slowcase_cnt: %d", _new_object_array_slowcase_cnt);
1454 tty->print_cr(" _new_instance_slowcase_cnt: %d", _new_instance_slowcase_cnt);
1455 tty->print_cr(" _new_multi_array_slowcase_cnt: %d", _new_multi_array_slowcase_cnt);
1456 tty->print_cr(" _monitorenter_slowcase_cnt: %d", _monitorenter_slowcase_cnt);
1457 tty->print_cr(" _monitorexit_slowcase_cnt: %d", _monitorexit_slowcase_cnt);
1458 tty->print_cr(" _patch_code_slowcase_cnt: %d", _patch_code_slowcase_cnt);
1459
1460 tty->print_cr(" _throw_range_check_exception_count: %d:", _throw_range_check_exception_count);
1461 tty->print_cr(" _throw_index_exception_count: %d:", _throw_index_exception_count);
1462 tty->print_cr(" _throw_div0_exception_count: %d:", _throw_div0_exception_count);
1463 tty->print_cr(" _throw_null_pointer_exception_count: %d:", _throw_null_pointer_exception_count);
1464 tty->print_cr(" _throw_class_cast_exception_count: %d:", _throw_class_cast_exception_count);
1465 tty->print_cr(" _throw_incompatible_class_change_error_count: %d:", _throw_incompatible_class_change_error_count);
1466 tty->print_cr(" _throw_array_store_exception_count: %d:", _throw_array_store_exception_count);
1467 tty->print_cr(" _throw_count: %d:", _throw_count);
1468
1469 SharedRuntime::print_ic_miss_histogram();
1470 tty->cr();
1471 }
1472 #endif // PRODUCT