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/collectedHeap.hpp"
43 #include "interpreter/bytecode.hpp"
44 #include "interpreter/interpreter.hpp"
45 #include "logging/log.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "oops/access.inline.hpp"
50 #include "oops/objArrayOop.inline.hpp"
51 #include "oops/objArrayKlass.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "runtime/atomic.hpp"
54 #include "runtime/biasedLocking.hpp"
55 #include "runtime/compilationPolicy.hpp"
56 #include "runtime/interfaceSupport.inline.hpp"
57 #include "runtime/frame.inline.hpp"
58 #include "runtime/javaCalls.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/vframe.inline.hpp"
62 #include "runtime/vframeArray.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "utilities/copy.hpp"
65 #include "utilities/events.hpp"
66
67
68 // Implementation of StubAssembler
69
70 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) {
71 _name = name;
72 _must_gc_arguments = false;
73 _frame_size = no_frame_size;
74 _num_rt_args = 0;
75 _stub_id = stub_id;
76 }
77
78
79 void StubAssembler::set_info(const char* name, bool must_gc_arguments) {
80 _name = name;
81 _must_gc_arguments = must_gc_arguments;
82 }
83
84
85 void StubAssembler::set_frame_size(int size) {
86 if (_frame_size == no_frame_size) {
87 _frame_size = size;
88 }
89 assert(_frame_size == size, "can't change the frame size");
90 }
91
92
93 void StubAssembler::set_num_rt_args(int args) {
94 if (_num_rt_args == 0) {
95 _num_rt_args = args;
96 }
97 assert(_num_rt_args == args, "can't change the number of args");
98 }
99
100 // Implementation of Runtime1
101
102 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids];
103 const char *Runtime1::_blob_names[] = {
104 RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME)
105 };
106
107 #ifndef PRODUCT
108 // statistics
109 int Runtime1::_generic_arraycopy_cnt = 0;
110 int Runtime1::_generic_arraycopystub_cnt = 0;
111 int Runtime1::_arraycopy_slowcase_cnt = 0;
112 int Runtime1::_arraycopy_checkcast_cnt = 0;
113 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0;
114 int Runtime1::_new_type_array_slowcase_cnt = 0;
115 int Runtime1::_new_object_array_slowcase_cnt = 0;
116 int Runtime1::_new_instance_slowcase_cnt = 0;
117 int Runtime1::_new_multi_array_slowcase_cnt = 0;
118 int Runtime1::_monitorenter_slowcase_cnt = 0;
119 int Runtime1::_monitorexit_slowcase_cnt = 0;
120 int Runtime1::_patch_code_slowcase_cnt = 0;
121 int Runtime1::_throw_range_check_exception_count = 0;
122 int Runtime1::_throw_index_exception_count = 0;
123 int Runtime1::_throw_div0_exception_count = 0;
124 int Runtime1::_throw_null_pointer_exception_count = 0;
125 int Runtime1::_throw_class_cast_exception_count = 0;
126 int Runtime1::_throw_incompatible_class_change_error_count = 0;
127 int Runtime1::_throw_array_store_exception_count = 0;
128 int Runtime1::_throw_count = 0;
129
130 static int _byte_arraycopy_stub_cnt = 0;
131 static int _short_arraycopy_stub_cnt = 0;
132 static int _int_arraycopy_stub_cnt = 0;
133 static int _long_arraycopy_stub_cnt = 0;
134 static int _oop_arraycopy_stub_cnt = 0;
135
136 address Runtime1::arraycopy_count_address(BasicType type) {
137 switch (type) {
138 case T_BOOLEAN:
139 case T_BYTE: return (address)&_byte_arraycopy_stub_cnt;
140 case T_CHAR:
141 case T_SHORT: return (address)&_short_arraycopy_stub_cnt;
142 case T_FLOAT:
143 case T_INT: return (address)&_int_arraycopy_stub_cnt;
144 case T_DOUBLE:
145 case T_LONG: return (address)&_long_arraycopy_stub_cnt;
146 case T_ARRAY:
147 case T_OBJECT: return (address)&_oop_arraycopy_stub_cnt;
148 default:
149 ShouldNotReachHere();
150 return NULL;
151 }
152 }
153
154
155 #endif
156
157 // Simple helper to see if the caller of a runtime stub which
158 // entered the VM has been deoptimized
159
160 static bool caller_is_deopted() {
161 JavaThread* thread = JavaThread::current();
162 RegisterMap reg_map(thread, false);
163 frame runtime_frame = thread->last_frame();
164 frame caller_frame = runtime_frame.sender(®_map);
165 assert(caller_frame.is_compiled_frame(), "must be compiled");
166 return caller_frame.is_deoptimized_frame();
167 }
168
169 // Stress deoptimization
170 static void deopt_caller() {
171 if ( !caller_is_deopted()) {
172 JavaThread* thread = JavaThread::current();
173 RegisterMap reg_map(thread, false);
174 frame runtime_frame = thread->last_frame();
175 frame caller_frame = runtime_frame.sender(®_map);
176 Deoptimization::deoptimize_frame(thread, caller_frame.id());
177 assert(caller_is_deopted(), "Must be deoptimized");
178 }
179 }
180
181
182 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) {
183 assert(0 <= id && id < number_of_ids, "illegal stub id");
184 ResourceMark rm;
185 // create code buffer for code storage
186 CodeBuffer code(buffer_blob);
187
188 OopMapSet* oop_maps;
189 int frame_size;
190 bool must_gc_arguments;
191
192 Compilation::setup_code_buffer(&code, 0);
193
194 // create assembler for code generation
195 StubAssembler* sasm = new StubAssembler(&code, name_for(id), id);
196 // generate code for runtime stub
197 oop_maps = generate_code_for(id, sasm);
198 assert(oop_maps == NULL || sasm->frame_size() != no_frame_size,
199 "if stub has an oop map it must have a valid frame size");
200
201 #ifdef ASSERT
202 // Make sure that stubs that need oopmaps have them
203 switch (id) {
204 // These stubs don't need to have an oopmap
205 case dtrace_object_alloc_id:
206 case g1_pre_barrier_slow_id:
207 case g1_post_barrier_slow_id:
208 case slow_subtype_check_id:
209 case fpu2long_stub_id:
210 case unwind_exception_id:
211 case counter_overflow_id:
212 #if defined(SPARC) || defined(PPC32)
213 case handle_exception_nofpu_id: // Unused on sparc
214 #endif
215 break;
216
217 // All other stubs should have oopmaps
218 default:
219 assert(oop_maps != NULL, "must have an oopmap");
220 }
221 #endif
222
223 // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned)
224 sasm->align(BytesPerWord);
225 // make sure all code is in code buffer
226 sasm->flush();
227
228 frame_size = sasm->frame_size();
229 must_gc_arguments = sasm->must_gc_arguments();
230 // create blob - distinguish a few special cases
231 CodeBlob* blob = RuntimeStub::new_runtime_stub(name_for(id),
232 &code,
233 CodeOffsets::frame_never_safe,
234 frame_size,
235 oop_maps,
236 must_gc_arguments);
237 // install blob
238 assert(blob != NULL, "blob must exist");
239 _blobs[id] = blob;
240 }
241
242
243 void Runtime1::initialize(BufferBlob* blob) {
244 // platform-dependent initialization
245 initialize_pd();
246 // generate stubs
247 for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id);
248 // printing
249 #ifndef PRODUCT
250 if (PrintSimpleStubs) {
251 ResourceMark rm;
252 for (int id = 0; id < number_of_ids; id++) {
253 _blobs[id]->print();
254 if (_blobs[id]->oop_maps() != NULL) {
255 _blobs[id]->oop_maps()->print();
256 }
257 }
258 }
259 #endif
260 }
261
262
263 CodeBlob* Runtime1::blob_for(StubID id) {
264 assert(0 <= id && id < number_of_ids, "illegal stub id");
265 return _blobs[id];
266 }
267
268
269 const char* Runtime1::name_for(StubID id) {
270 assert(0 <= id && id < number_of_ids, "illegal stub id");
271 return _blob_names[id];
272 }
273
274 const char* Runtime1::name_for_address(address entry) {
275 for (int id = 0; id < number_of_ids; id++) {
276 if (entry == entry_for((StubID)id)) return name_for((StubID)id);
277 }
278
279 #define FUNCTION_CASE(a, f) \
280 if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f)) return #f
281
282 FUNCTION_CASE(entry, os::javaTimeMillis);
283 FUNCTION_CASE(entry, os::javaTimeNanos);
284 FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end);
285 FUNCTION_CASE(entry, SharedRuntime::d2f);
286 FUNCTION_CASE(entry, SharedRuntime::d2i);
287 FUNCTION_CASE(entry, SharedRuntime::d2l);
288 FUNCTION_CASE(entry, SharedRuntime::dcos);
289 FUNCTION_CASE(entry, SharedRuntime::dexp);
290 FUNCTION_CASE(entry, SharedRuntime::dlog);
291 FUNCTION_CASE(entry, SharedRuntime::dlog10);
292 FUNCTION_CASE(entry, SharedRuntime::dpow);
293 FUNCTION_CASE(entry, SharedRuntime::drem);
294 FUNCTION_CASE(entry, SharedRuntime::dsin);
295 FUNCTION_CASE(entry, SharedRuntime::dtan);
296 FUNCTION_CASE(entry, SharedRuntime::f2i);
297 FUNCTION_CASE(entry, SharedRuntime::f2l);
298 FUNCTION_CASE(entry, SharedRuntime::frem);
299 FUNCTION_CASE(entry, SharedRuntime::l2d);
300 FUNCTION_CASE(entry, SharedRuntime::l2f);
301 FUNCTION_CASE(entry, SharedRuntime::ldiv);
302 FUNCTION_CASE(entry, SharedRuntime::lmul);
303 FUNCTION_CASE(entry, SharedRuntime::lrem);
304 FUNCTION_CASE(entry, SharedRuntime::lrem);
305 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry);
306 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit);
307 FUNCTION_CASE(entry, is_instance_of);
308 FUNCTION_CASE(entry, trace_block_entry);
309 #ifdef TRACE_HAVE_INTRINSICS
310 FUNCTION_CASE(entry, TRACE_TIME_METHOD);
311 #endif
312 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32());
313 FUNCTION_CASE(entry, StubRoutines::updateBytesCRC32C());
314 FUNCTION_CASE(entry, StubRoutines::vectorizedMismatch());
315 FUNCTION_CASE(entry, StubRoutines::dexp());
316 FUNCTION_CASE(entry, StubRoutines::dlog());
317 FUNCTION_CASE(entry, StubRoutines::dlog10());
318 FUNCTION_CASE(entry, StubRoutines::dpow());
319 FUNCTION_CASE(entry, StubRoutines::dsin());
320 FUNCTION_CASE(entry, StubRoutines::dcos());
321 FUNCTION_CASE(entry, StubRoutines::dtan());
322
323 #undef FUNCTION_CASE
324
325 // Soft float adds more runtime names.
326 return pd_name_for_address(entry);
327 }
328
329
330 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, Klass* klass))
331 NOT_PRODUCT(_new_instance_slowcase_cnt++;)
332
333 assert(klass->is_klass(), "not a class");
334 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive
335 InstanceKlass* h = InstanceKlass::cast(klass);
336 h->check_valid_for_instantiation(true, CHECK);
337 // make sure klass is initialized
338 h->initialize(CHECK);
339 // allocate instance and return via TLS
340 oop obj = h->allocate_instance(CHECK);
341 thread->set_vm_result(obj);
342 JRT_END
343
344
345 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, Klass* klass, jint length))
346 NOT_PRODUCT(_new_type_array_slowcase_cnt++;)
347 // Note: no handle for klass needed since they are not used
348 // anymore after new_typeArray() and no GC can happen before.
349 // (This may have to change if this code changes!)
350 assert(klass->is_klass(), "not a class");
351 BasicType elt_type = TypeArrayKlass::cast(klass)->element_type();
352 oop obj = oopFactory::new_typeArray(elt_type, length, CHECK);
353 thread->set_vm_result(obj);
354 // This is pretty rare but this runtime patch is stressful to deoptimization
355 // if we deoptimize here so force a deopt to stress the path.
356 if (DeoptimizeALot) {
357 deopt_caller();
358 }
359
360 JRT_END
361
362
363 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, Klass* array_klass, jint length))
364 NOT_PRODUCT(_new_object_array_slowcase_cnt++;)
365
366 // Note: no handle for klass needed since they are not used
367 // anymore after new_objArray() and no GC can happen before.
368 // (This may have to change if this code changes!)
369 assert(array_klass->is_klass(), "not a class");
370 Handle holder(THREAD, array_klass->klass_holder()); // keep the klass alive
371 Klass* elem_klass = ObjArrayKlass::cast(array_klass)->element_klass();
372 objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK);
373 thread->set_vm_result(obj);
374 // This is pretty rare but this runtime patch is stressful to deoptimization
375 // if we deoptimize here so force a deopt to stress the path.
376 if (DeoptimizeALot) {
377 deopt_caller();
378 }
379 JRT_END
380
381
382 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims))
383 NOT_PRODUCT(_new_multi_array_slowcase_cnt++;)
384
385 assert(klass->is_klass(), "not a class");
386 assert(rank >= 1, "rank must be nonzero");
387 Handle holder(THREAD, klass->klass_holder()); // keep the klass alive
388 oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK);
389 thread->set_vm_result(obj);
390 JRT_END
391
392
393 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id))
394 tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id);
395 JRT_END
396
397
398 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj))
399 ResourceMark rm(thread);
400 const char* klass_name = obj->klass()->external_name();
401 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name);
402 JRT_END
403
404
405 // counter_overflow() is called from within C1-compiled methods. The enclosing method is the method
406 // associated with the top activation record. The inlinee (that is possibly included in the enclosing
407 // method) method oop is passed as an argument. In order to do that it is embedded in the code as
408 // a constant.
409 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, Method* m) {
410 nmethod* osr_nm = NULL;
411 methodHandle method(THREAD, m);
412
413 RegisterMap map(THREAD, false);
414 frame fr = THREAD->last_frame().sender(&map);
415 nmethod* nm = (nmethod*) fr.cb();
416 assert(nm!= NULL && nm->is_nmethod(), "Sanity check");
417 methodHandle enclosing_method(THREAD, nm->method());
418
419 CompLevel level = (CompLevel)nm->comp_level();
420 int bci = InvocationEntryBci;
421 if (branch_bci != InvocationEntryBci) {
422 // Compute destination bci
423 address pc = method()->code_base() + branch_bci;
424 Bytecodes::Code branch = Bytecodes::code_at(method(), pc);
425 int offset = 0;
426 switch (branch) {
427 case Bytecodes::_if_icmplt: case Bytecodes::_iflt:
428 case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt:
429 case Bytecodes::_if_icmple: case Bytecodes::_ifle:
430 case Bytecodes::_if_icmpge: case Bytecodes::_ifge:
431 case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq:
432 case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne:
433 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto:
434 offset = (int16_t)Bytes::get_Java_u2(pc + 1);
435 break;
436 case Bytecodes::_goto_w:
437 offset = Bytes::get_Java_u4(pc + 1);
438 break;
439 default: ;
440 }
441 bci = branch_bci + offset;
442 }
443 assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
444 osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, nm, THREAD);
445 assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
446 return osr_nm;
447 }
448
449 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, Method* method))
450 nmethod* osr_nm;
451 JRT_BLOCK
452 osr_nm = counter_overflow_helper(thread, bci, method);
453 if (osr_nm != NULL) {
454 RegisterMap map(thread, false);
455 frame fr = thread->last_frame().sender(&map);
456 Deoptimization::deoptimize_frame(thread, fr.id());
457 }
458 JRT_BLOCK_END
459 return NULL;
460 JRT_END
461
462 extern void vm_exit(int code);
463
464 // Enter this method from compiled code handler below. This is where we transition
465 // to VM mode. This is done as a helper routine so that the method called directly
466 // from compiled code does not have to transition to VM. This allows the entry
467 // method to see if the nmethod that we have just looked up a handler for has
468 // been deoptimized while we were in the vm. This simplifies the assembly code
469 // cpu directories.
470 //
471 // We are entering here from exception stub (via the entry method below)
472 // If there is a compiled exception handler in this method, we will continue there;
473 // otherwise we will unwind the stack and continue at the caller of top frame method
474 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to
475 // control the area where we can allow a safepoint. After we exit the safepoint area we can
476 // check to see if the handler we are going to return is now in a nmethod that has
477 // been deoptimized. If that is the case we return the deopt blob
478 // unpack_with_exception entry instead. This makes life for the exception blob easier
479 // because making that same check and diverting is painful from assembly language.
480 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm))
481 // Reset method handle flag.
482 thread->set_is_method_handle_return(false);
483
484 Handle exception(thread, ex);
485 nm = CodeCache::find_nmethod(pc);
486 assert(nm != NULL, "this is not an nmethod");
487 // Adjust the pc as needed/
488 if (nm->is_deopt_pc(pc)) {
489 RegisterMap map(thread, false);
490 frame exception_frame = thread->last_frame().sender(&map);
491 // if the frame isn't deopted then pc must not correspond to the caller of last_frame
492 assert(exception_frame.is_deoptimized_frame(), "must be deopted");
493 pc = exception_frame.pc();
494 }
495 #ifdef ASSERT
496 assert(exception.not_null(), "NULL exceptions should be handled by throw_exception");
497 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
498 if (!(exception->is_a(SystemDictionary::Throwable_klass()))) {
499 if (ExitVMOnVerifyError) vm_exit(-1);
500 ShouldNotReachHere();
501 }
502 #endif
503
504 // Check the stack guard pages and reenable them if necessary and there is
505 // enough space on the stack to do so. Use fast exceptions only if the guard
506 // pages are enabled.
507 bool guard_pages_enabled = thread->stack_guards_enabled();
508 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
509
510 if (JvmtiExport::can_post_on_exceptions()) {
511 // To ensure correct notification of exception catches and throws
512 // we have to deoptimize here. If we attempted to notify the
513 // catches and throws during this exception lookup it's possible
514 // we could deoptimize on the way out of the VM and end back in
515 // the interpreter at the throw site. This would result in double
516 // notifications since the interpreter would also notify about
517 // these same catches and throws as it unwound the frame.
518
519 RegisterMap reg_map(thread);
520 frame stub_frame = thread->last_frame();
521 frame caller_frame = stub_frame.sender(®_map);
522
523 // We don't really want to deoptimize the nmethod itself since we
524 // can actually continue in the exception handler ourselves but I
525 // don't see an easy way to have the desired effect.
526 Deoptimization::deoptimize_frame(thread, caller_frame.id());
527 assert(caller_is_deopted(), "Must be deoptimized");
528
529 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
530 }
531
532 // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions
533 if (guard_pages_enabled) {
534 address fast_continuation = nm->handler_for_exception_and_pc(exception, pc);
535 if (fast_continuation != NULL) {
536 // Set flag if return address is a method handle call site.
537 thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
538 return fast_continuation;
539 }
540 }
541
542 // If the stack guard pages are enabled, check whether there is a handler in
543 // the current method. Otherwise (guard pages disabled), force an unwind and
544 // skip the exception cache update (i.e., just leave continuation==NULL).
545 address continuation = NULL;
546 if (guard_pages_enabled) {
547
548 // New exception handling mechanism can support inlined methods
549 // with exception handlers since the mappings are from PC to PC
550
551 // debugging support
552 // tracing
553 if (log_is_enabled(Info, exceptions)) {
554 ResourceMark rm;
555 stringStream tempst;
556 tempst.print("compiled method <%s>\n"
557 " at PC" INTPTR_FORMAT " for thread " INTPTR_FORMAT,
558 nm->method()->print_value_string(), p2i(pc), p2i(thread));
559 Exceptions::log_exception(exception, tempst);
560 }
561 // for AbortVMOnException flag
562 Exceptions::debug_check_abort(exception);
563
564 // Clear out the exception oop and pc since looking up an
565 // exception handler can cause class loading, which might throw an
566 // exception and those fields are expected to be clear during
567 // normal bytecode execution.
568 thread->clear_exception_oop_and_pc();
569
570 bool recursive_exception = false;
571 continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false, recursive_exception);
572 // If an exception was thrown during exception dispatch, the exception oop may have changed
573 thread->set_exception_oop(exception());
574 thread->set_exception_pc(pc);
575
576 // the exception cache is used only by non-implicit exceptions
577 // Update the exception cache only when there didn't happen
578 // another exception during the computation of the compiled
579 // exception handler. Checking for exception oop equality is not
580 // sufficient because some exceptions are pre-allocated and reused.
581 if (continuation != NULL && !recursive_exception) {
582 nm->add_handler_for_exception_and_pc(exception, pc, continuation);
583 }
584 }
585
586 thread->set_vm_result(exception());
587 // Set flag if return address is a method handle call site.
588 thread->set_is_method_handle_return(nm->is_method_handle_return(pc));
589
590 if (log_is_enabled(Info, exceptions)) {
591 ResourceMark rm;
592 log_info(exceptions)("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT
593 " for exception thrown at PC " PTR_FORMAT,
594 p2i(thread), p2i(continuation), p2i(pc));
595 }
596
597 return continuation;
598 JRT_END
599
600 // Enter this method from compiled code only if there is a Java exception handler
601 // in the method handling the exception.
602 // We are entering here from exception stub. We don't do a normal VM transition here.
603 // We do it in a helper. This is so we can check to see if the nmethod we have just
604 // searched for an exception handler has been deoptimized in the meantime.
605 address Runtime1::exception_handler_for_pc(JavaThread* thread) {
606 oop exception = thread->exception_oop();
607 address pc = thread->exception_pc();
608 // Still in Java mode
609 DEBUG_ONLY(ResetNoHandleMark rnhm);
610 nmethod* nm = NULL;
611 address continuation = NULL;
612 {
613 // Enter VM mode by calling the helper
614 ResetNoHandleMark rnhm;
615 continuation = exception_handler_for_pc_helper(thread, exception, pc, nm);
616 }
617 // Back in JAVA, use no oops DON'T safepoint
618
619 // Now check to see if the nmethod we were called from is now deoptimized.
620 // If so we must return to the deopt blob and deoptimize the nmethod
621 if (nm != NULL && caller_is_deopted()) {
622 continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
623 }
624
625 assert(continuation != NULL, "no handler found");
626 return continuation;
627 }
628
629
630 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index))
631 NOT_PRODUCT(_throw_range_check_exception_count++;)
632 char message[jintAsStringSize];
633 sprintf(message, "%d", index);
634 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message);
635 JRT_END
636
637
638 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index))
639 NOT_PRODUCT(_throw_index_exception_count++;)
640 char message[16];
641 sprintf(message, "%d", index);
642 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message);
643 JRT_END
644
645
646 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread))
647 NOT_PRODUCT(_throw_div0_exception_count++;)
648 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
649 JRT_END
650
651
652 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread))
653 NOT_PRODUCT(_throw_null_pointer_exception_count++;)
654 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
655 JRT_END
656
657
658 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object))
659 NOT_PRODUCT(_throw_class_cast_exception_count++;)
660 ResourceMark rm(thread);
661 char* message = SharedRuntime::generate_class_cast_message(
662 thread, object->klass());
663 SharedRuntime::throw_and_post_jvmti_exception(
664 thread, vmSymbols::java_lang_ClassCastException(), message);
665 JRT_END
666
667
668 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread))
669 NOT_PRODUCT(_throw_incompatible_class_change_error_count++;)
670 ResourceMark rm(thread);
671 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError());
672 JRT_END
673
674
675 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock))
676 NOT_PRODUCT(_monitorenter_slowcase_cnt++;)
677 if (PrintBiasedLockingStatistics) {
678 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
679 }
680 Handle h_obj(thread, obj);
681 if (UseBiasedLocking) {
682 // Retry fast entry if bias is revoked to avoid unnecessary inflation
683 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK);
684 } else {
685 if (UseFastLocking) {
686 // When using fast locking, the compiled code has already tried the fast case
687 assert(obj == lock->obj(), "must match");
688 ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD);
689 } else {
690 lock->set_obj(obj);
691 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD);
692 }
693 }
694 JRT_END
695
696
697 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock))
698 NOT_PRODUCT(_monitorexit_slowcase_cnt++;)
699 assert(thread == JavaThread::current(), "threads must correspond");
700 assert(thread->last_Java_sp(), "last_Java_sp must be set");
701 // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown
702 EXCEPTION_MARK;
703
704 oop obj = lock->obj();
705 assert(oopDesc::is_oop(obj), "must be NULL or an object");
706 if (UseFastLocking) {
707 // When using fast locking, the compiled code has already tried the fast case
708 ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD);
709 } else {
710 ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD);
711 }
712 JRT_END
713
714 // Cf. OptoRuntime::deoptimize_caller_frame
715 JRT_ENTRY(void, Runtime1::deoptimize(JavaThread* thread, jint trap_request))
716 // Called from within the owner thread, so no need for safepoint
717 RegisterMap reg_map(thread, false);
718 frame stub_frame = thread->last_frame();
719 assert(stub_frame.is_runtime_frame(), "Sanity check");
720 frame caller_frame = stub_frame.sender(®_map);
721 nmethod* nm = caller_frame.cb()->as_nmethod_or_null();
722 assert(nm != NULL, "Sanity check");
723 methodHandle method(thread, nm->method());
724 assert(nm == CodeCache::find_nmethod(caller_frame.pc()), "Should be the same");
725 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request);
726 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request);
727
728 if (action == Deoptimization::Action_make_not_entrant) {
729 if (nm->make_not_entrant()) {
730 if (reason == Deoptimization::Reason_tenured) {
731 MethodData* trap_mdo = Deoptimization::get_method_data(thread, method, true /*create_if_missing*/);
732 if (trap_mdo != NULL) {
733 trap_mdo->inc_tenure_traps();
734 }
735 }
736 }
737 }
738
739 // Deoptimize the caller frame.
740 Deoptimization::deoptimize_frame(thread, caller_frame.id());
741 // Return to the now deoptimized frame.
742 JRT_END
743
744
745 #ifndef DEOPTIMIZE_WHEN_PATCHING
746
747 static Klass* resolve_field_return_klass(const methodHandle& caller, int bci, TRAPS) {
748 Bytecode_field field_access(caller, bci);
749 // This can be static or non-static field access
750 Bytecodes::Code code = field_access.code();
751
752 // We must load class, initialize class and resolve the field
753 fieldDescriptor result; // initialize class if needed
754 constantPoolHandle constants(THREAD, caller->constants());
755 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller, Bytecodes::java_code(code), CHECK_NULL);
756 return result.field_holder();
757 }
758
759
760 //
761 // This routine patches sites where a class wasn't loaded or
762 // initialized at the time the code was generated. It handles
763 // references to classes, fields and forcing of initialization. Most
764 // of the cases are straightforward and involving simply forcing
765 // resolution of a class, rewriting the instruction stream with the
766 // needed constant and replacing the call in this function with the
767 // patched code. The case for static field is more complicated since
768 // the thread which is in the process of initializing a class can
769 // access it's static fields but other threads can't so the code
770 // either has to deoptimize when this case is detected or execute a
771 // check that the current thread is the initializing thread. The
772 // current
773 //
774 // Patches basically look like this:
775 //
776 //
777 // patch_site: jmp patch stub ;; will be patched
778 // continue: ...
779 // ...
780 // ...
781 // ...
782 //
783 // They have a stub which looks like this:
784 //
785 // ;; patch body
786 // movl <const>, reg (for class constants)
787 // <or> movl [reg1 + <const>], reg (for field offsets)
788 // <or> movl reg, [reg1 + <const>] (for field offsets)
789 // <being_init offset> <bytes to copy> <bytes to skip>
790 // patch_stub: call Runtime1::patch_code (through a runtime stub)
791 // jmp patch_site
792 //
793 //
794 // A normal patch is done by rewriting the patch body, usually a move,
795 // and then copying it into place over top of the jmp instruction
796 // being careful to flush caches and doing it in an MP-safe way. The
797 // constants following the patch body are used to find various pieces
798 // of the patch relative to the call site for Runtime1::patch_code.
799 // The case for getstatic and putstatic is more complicated because
800 // getstatic and putstatic have special semantics when executing while
801 // the class is being initialized. getstatic/putstatic on a class
802 // which is being_initialized may be executed by the initializing
803 // thread but other threads have to block when they execute it. This
804 // is accomplished in compiled code by executing a test of the current
805 // thread against the initializing thread of the class. It's emitted
806 // as boilerplate in their stub which allows the patched code to be
807 // executed before it's copied back into the main body of the nmethod.
808 //
809 // being_init: get_thread(<tmp reg>
810 // cmpl [reg1 + <init_thread_offset>], <tmp reg>
811 // jne patch_stub
812 // movl [reg1 + <const>], reg (for field offsets) <or>
813 // movl reg, [reg1 + <const>] (for field offsets)
814 // jmp continue
815 // <being_init offset> <bytes to copy> <bytes to skip>
816 // patch_stub: jmp Runtim1::patch_code (through a runtime stub)
817 // jmp patch_site
818 //
819 // If the class is being initialized the patch body is rewritten and
820 // the patch site is rewritten to jump to being_init, instead of
821 // patch_stub. Whenever this code is executed it checks the current
822 // thread against the intializing thread so other threads will enter
823 // the runtime and end up blocked waiting the class to finish
824 // initializing inside the calls to resolve_field below. The
825 // initializing class will continue on it's way. Once the class is
826 // fully_initialized, the intializing_thread of the class becomes
827 // NULL, so the next thread to execute this code will fail the test,
828 // call into patch_code and complete the patching process by copying
829 // the patch body back into the main part of the nmethod and resume
830 // executing.
831 //
832 //
833
834 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))
835 NOT_PRODUCT(_patch_code_slowcase_cnt++;)
836
837 ResourceMark rm(thread);
838 RegisterMap reg_map(thread, false);
839 frame runtime_frame = thread->last_frame();
840 frame caller_frame = runtime_frame.sender(®_map);
841
842 // last java frame on stack
843 vframeStream vfst(thread, true);
844 assert(!vfst.at_end(), "Java frame must exist");
845
846 methodHandle caller_method(THREAD, vfst.method());
847 // Note that caller_method->code() may not be same as caller_code because of OSR's
848 // Note also that in the presence of inlining it is not guaranteed
849 // that caller_method() == caller_code->method()
850
851 int bci = vfst.bci();
852 Bytecodes::Code code = caller_method()->java_code_at(bci);
853
854 // this is used by assertions in the access_field_patching_id
855 BasicType patch_field_type = T_ILLEGAL;
856 bool deoptimize_for_volatile = false;
857 bool deoptimize_for_atomic = false;
858 int patch_field_offset = -1;
859 Klass* init_klass = NULL; // klass needed by load_klass_patching code
860 Klass* load_klass = NULL; // klass needed by load_klass_patching code
861 Handle mirror(THREAD, NULL); // oop needed by load_mirror_patching code
862 Handle appendix(THREAD, NULL); // oop needed by appendix_patching code
863 bool load_klass_or_mirror_patch_id =
864 (stub_id == Runtime1::load_klass_patching_id || stub_id == Runtime1::load_mirror_patching_id);
865
866 if (stub_id == Runtime1::access_field_patching_id) {
867
868 Bytecode_field field_access(caller_method, bci);
869 fieldDescriptor result; // initialize class if needed
870 Bytecodes::Code code = field_access.code();
871 constantPoolHandle constants(THREAD, caller_method->constants());
872 LinkResolver::resolve_field_access(result, constants, field_access.index(), caller_method, Bytecodes::java_code(code), CHECK);
873 patch_field_offset = result.offset();
874
875 // If we're patching a field which is volatile then at compile it
876 // must not have been know to be volatile, so the generated code
877 // isn't correct for a volatile reference. The nmethod has to be
878 // deoptimized so that the code can be regenerated correctly.
879 // This check is only needed for access_field_patching since this
880 // is the path for patching field offsets. load_klass is only
881 // used for patching references to oops which don't need special
882 // handling in the volatile case.
883
884 deoptimize_for_volatile = result.access_flags().is_volatile();
885
886 // If we are patching a field which should be atomic, then
887 // the generated code is not correct either, force deoptimizing.
888 // We need to only cover T_LONG and T_DOUBLE fields, as we can
889 // break access atomicity only for them.
890
891 // Strictly speaking, the deoptimizaation on 64-bit platforms
892 // is unnecessary, and T_LONG stores on 32-bit platforms need
893 // to be handled by special patching code when AlwaysAtomicAccesses
894 // becomes product feature. At this point, we are still going
895 // for the deoptimization for consistency against volatile
896 // accesses.
897
898 patch_field_type = result.field_type();
899 deoptimize_for_atomic = (AlwaysAtomicAccesses && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG));
900
901 } else if (load_klass_or_mirror_patch_id) {
902 Klass* k = NULL;
903 switch (code) {
904 case Bytecodes::_putstatic:
905 case Bytecodes::_getstatic:
906 { Klass* klass = resolve_field_return_klass(caller_method, bci, CHECK);
907 init_klass = klass;
908 mirror = Handle(THREAD, klass->java_mirror());
909 }
910 break;
911 case Bytecodes::_new:
912 { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci));
913 k = caller_method->constants()->klass_at(bnew.index(), CHECK);
914 }
915 break;
916 case Bytecodes::_multianewarray:
917 { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci));
918 k = caller_method->constants()->klass_at(mna.index(), CHECK);
919 }
920 break;
921 case Bytecodes::_instanceof:
922 { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci));
923 k = caller_method->constants()->klass_at(io.index(), CHECK);
924 }
925 break;
926 case Bytecodes::_checkcast:
927 { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci));
928 k = caller_method->constants()->klass_at(cc.index(), CHECK);
929 }
930 break;
931 case Bytecodes::_anewarray:
932 { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci));
933 Klass* ek = caller_method->constants()->klass_at(anew.index(), CHECK);
934 k = ek->array_klass(CHECK);
935 }
936 break;
937 case Bytecodes::_ldc:
938 case Bytecodes::_ldc_w:
939 {
940 Bytecode_loadconstant cc(caller_method, bci);
941 oop m = cc.resolve_constant(CHECK);
942 mirror = Handle(THREAD, m);
943 }
944 break;
945 default: fatal("unexpected bytecode for load_klass_or_mirror_patch_id");
946 }
947 load_klass = k;
948 } else if (stub_id == load_appendix_patching_id) {
949 Bytecode_invoke bytecode(caller_method, bci);
950 Bytecodes::Code bc = bytecode.invoke_code();
951
952 CallInfo info;
953 constantPoolHandle pool(thread, caller_method->constants());
954 int index = bytecode.index();
955 LinkResolver::resolve_invoke(info, Handle(), pool, index, bc, CHECK);
956 switch (bc) {
957 case Bytecodes::_invokehandle: {
958 int cache_index = ConstantPool::decode_cpcache_index(index, true);
959 assert(cache_index >= 0 && cache_index < pool->cache()->length(), "unexpected cache index");
960 ConstantPoolCacheEntry* cpce = pool->cache()->entry_at(cache_index);
961 cpce->set_method_handle(pool, info);
962 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry
963 break;
964 }
965 case Bytecodes::_invokedynamic: {
966 ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
967 cpce->set_dynamic_call(pool, info);
968 appendix = Handle(THREAD, cpce->appendix_if_resolved(pool)); // just in case somebody already resolved the entry
969 break;
970 }
971 default: fatal("unexpected bytecode for load_appendix_patching_id");
972 }
973 } else {
974 ShouldNotReachHere();
975 }
976
977 if (deoptimize_for_volatile || deoptimize_for_atomic) {
978 // At compile time we assumed the field wasn't volatile/atomic but after
979 // loading it turns out it was volatile/atomic so we have to throw the
980 // compiled code out and let it be regenerated.
981 if (TracePatching) {
982 if (deoptimize_for_volatile) {
983 tty->print_cr("Deoptimizing for patching volatile field reference");
984 }
985 if (deoptimize_for_atomic) {
986 tty->print_cr("Deoptimizing for patching atomic field reference");
987 }
988 }
989
990 // It's possible the nmethod was invalidated in the last
991 // safepoint, but if it's still alive then make it not_entrant.
992 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
993 if (nm != NULL) {
994 nm->make_not_entrant();
995 }
996
997 Deoptimization::deoptimize_frame(thread, caller_frame.id());
998
999 // Return to the now deoptimized frame.
1000 }
1001
1002 // Now copy code back
1003
1004 {
1005 MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag);
1006 //
1007 // Deoptimization may have happened while we waited for the lock.
1008 // In that case we don't bother to do any patching we just return
1009 // and let the deopt happen
1010 if (!caller_is_deopted()) {
1011 NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc());
1012 address instr_pc = jump->jump_destination();
1013 NativeInstruction* ni = nativeInstruction_at(instr_pc);
1014 if (ni->is_jump() ) {
1015 // the jump has not been patched yet
1016 // The jump destination is slow case and therefore not part of the stubs
1017 // (stubs are only for StaticCalls)
1018
1019 // format of buffer
1020 // ....
1021 // instr byte 0 <-- copy_buff
1022 // instr byte 1
1023 // ..
1024 // instr byte n-1
1025 // n
1026 // .... <-- call destination
1027
1028 address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset();
1029 unsigned char* byte_count = (unsigned char*) (stub_location - 1);
1030 unsigned char* byte_skip = (unsigned char*) (stub_location - 2);
1031 unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3);
1032 address copy_buff = stub_location - *byte_skip - *byte_count;
1033 address being_initialized_entry = stub_location - *being_initialized_entry_offset;
1034 if (TracePatching) {
1035 ttyLocker ttyl;
1036 tty->print_cr(" Patching %s at bci %d at address " INTPTR_FORMAT " (%s)", Bytecodes::name(code), bci,
1037 p2i(instr_pc), (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass");
1038 nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc());
1039 assert(caller_code != NULL, "nmethod not found");
1040
1041 // NOTE we use pc() not original_pc() because we already know they are
1042 // identical otherwise we'd have never entered this block of code
1043
1044 const ImmutableOopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc());
1045 assert(map != NULL, "null check");
1046 map->print();
1047 tty->cr();
1048
1049 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1050 }
1051 // depending on the code below, do_patch says whether to copy the patch body back into the nmethod
1052 bool do_patch = true;
1053 if (stub_id == Runtime1::access_field_patching_id) {
1054 // The offset may not be correct if the class was not loaded at code generation time.
1055 // Set it now.
1056 NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff);
1057 assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type");
1058 assert(patch_field_offset >= 0, "illegal offset");
1059 n_move->add_offset_in_bytes(patch_field_offset);
1060 } else if (load_klass_or_mirror_patch_id) {
1061 // If a getstatic or putstatic is referencing a klass which
1062 // isn't fully initialized, the patch body isn't copied into
1063 // place until initialization is complete. In this case the
1064 // patch site is setup so that any threads besides the
1065 // initializing thread are forced to come into the VM and
1066 // block.
1067 do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) ||
1068 InstanceKlass::cast(init_klass)->is_initialized();
1069 NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc);
1070 if (jump->jump_destination() == being_initialized_entry) {
1071 assert(do_patch == true, "initialization must be complete at this point");
1072 } else {
1073 // patch the instruction <move reg, klass>
1074 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
1075
1076 assert(n_copy->data() == 0 ||
1077 n_copy->data() == (intptr_t)Universe::non_oop_word(),
1078 "illegal init value");
1079 if (stub_id == Runtime1::load_klass_patching_id) {
1080 assert(load_klass != NULL, "klass not set");
1081 n_copy->set_data((intx) (load_klass));
1082 } else {
1083 assert(mirror() != NULL, "klass not set");
1084 // Don't need a G1 pre-barrier here since we assert above that data isn't an oop.
1085 n_copy->set_data(cast_from_oop<intx>(mirror()));
1086 }
1087
1088 if (TracePatching) {
1089 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1090 }
1091 }
1092 } else if (stub_id == Runtime1::load_appendix_patching_id) {
1093 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
1094 assert(n_copy->data() == 0 ||
1095 n_copy->data() == (intptr_t)Universe::non_oop_word(),
1096 "illegal init value");
1097 n_copy->set_data(cast_from_oop<intx>(appendix()));
1098
1099 if (TracePatching) {
1100 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
1101 }
1102 } else {
1103 ShouldNotReachHere();
1104 }
1105
1106 #if defined(SPARC) || defined(PPC32)
1107 if (load_klass_or_mirror_patch_id ||
1108 stub_id == Runtime1::load_appendix_patching_id) {
1109 // Update the location in the nmethod with the proper
1110 // metadata. When the code was generated, a NULL was stuffed
1111 // in the metadata table and that table needs to be update to
1112 // have the right value. On intel the value is kept
1113 // directly in the instruction instead of in the metadata
1114 // table, so set_data above effectively updated the value.
1115 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1116 assert(nm != NULL, "invalid nmethod_pc");
1117 RelocIterator mds(nm, copy_buff, copy_buff + 1);
1118 bool found = false;
1119 while (mds.next() && !found) {
1120 if (mds.type() == relocInfo::oop_type) {
1121 assert(stub_id == Runtime1::load_mirror_patching_id ||
1122 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id");
1123 oop_Relocation* r = mds.oop_reloc();
1124 oop* oop_adr = r->oop_addr();
1125 *oop_adr = stub_id == Runtime1::load_mirror_patching_id ? mirror() : appendix();
1126 r->fix_oop_relocation();
1127 found = true;
1128 } else if (mds.type() == relocInfo::metadata_type) {
1129 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id");
1130 metadata_Relocation* r = mds.metadata_reloc();
1131 Metadata** metadata_adr = r->metadata_addr();
1132 *metadata_adr = load_klass;
1133 r->fix_metadata_relocation();
1134 found = true;
1135 }
1136 }
1137 assert(found, "the metadata must exist!");
1138 }
1139 #endif
1140 if (do_patch) {
1141 // replace instructions
1142 // first replace the tail, then the call
1143 #ifdef ARM
1144 if((load_klass_or_mirror_patch_id ||
1145 stub_id == Runtime1::load_appendix_patching_id) &&
1146 nativeMovConstReg_at(copy_buff)->is_pc_relative()) {
1147 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1148 address addr = NULL;
1149 assert(nm != NULL, "invalid nmethod_pc");
1150 RelocIterator mds(nm, copy_buff, copy_buff + 1);
1151 while (mds.next()) {
1152 if (mds.type() == relocInfo::oop_type) {
1153 assert(stub_id == Runtime1::load_mirror_patching_id ||
1154 stub_id == Runtime1::load_appendix_patching_id, "wrong stub id");
1155 oop_Relocation* r = mds.oop_reloc();
1156 addr = (address)r->oop_addr();
1157 break;
1158 } else if (mds.type() == relocInfo::metadata_type) {
1159 assert(stub_id == Runtime1::load_klass_patching_id, "wrong stub id");
1160 metadata_Relocation* r = mds.metadata_reloc();
1161 addr = (address)r->metadata_addr();
1162 break;
1163 }
1164 }
1165 assert(addr != NULL, "metadata relocation must exist");
1166 copy_buff -= *byte_count;
1167 NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff);
1168 n_copy2->set_pc_relative_offset(addr, instr_pc);
1169 }
1170 #endif
1171
1172 for (int i = NativeGeneralJump::instruction_size; i < *byte_count; i++) {
1173 address ptr = copy_buff + i;
1174 int a_byte = (*ptr) & 0xFF;
1175 address dst = instr_pc + i;
1176 *(unsigned char*)dst = (unsigned char) a_byte;
1177 }
1178 ICache::invalidate_range(instr_pc, *byte_count);
1179 NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff);
1180
1181 if (load_klass_or_mirror_patch_id ||
1182 stub_id == Runtime1::load_appendix_patching_id) {
1183 relocInfo::relocType rtype =
1184 (stub_id == Runtime1::load_klass_patching_id) ?
1185 relocInfo::metadata_type :
1186 relocInfo::oop_type;
1187 // update relocInfo to metadata
1188 nmethod* nm = CodeCache::find_nmethod(instr_pc);
1189 assert(nm != NULL, "invalid nmethod_pc");
1190
1191 // The old patch site is now a move instruction so update
1192 // the reloc info so that it will get updated during
1193 // future GCs.
1194 RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1));
1195 relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc,
1196 relocInfo::none, rtype);
1197 #ifdef SPARC
1198 // Sparc takes two relocations for an metadata so update the second one.
1199 address instr_pc2 = instr_pc + NativeMovConstReg::add_offset;
1200 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
1201 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
1202 relocInfo::none, rtype);
1203 #endif
1204 #ifdef PPC32
1205 { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset;
1206 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
1207 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
1208 relocInfo::none, rtype);
1209 }
1210 #endif
1211 }
1212
1213 } else {
1214 ICache::invalidate_range(copy_buff, *byte_count);
1215 NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry);
1216 }
1217 }
1218 }
1219 }
1220
1221 // If we are patching in a non-perm oop, make sure the nmethod
1222 // is on the right list.
1223 if (ScavengeRootsInCode) {
1224 MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag);
1225 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1226 guarantee(nm != NULL, "only nmethods can contain non-perm oops");
1227
1228 // Since we've patched some oops in the nmethod,
1229 // (re)register it with the heap.
1230 Universe::heap()->register_nmethod(nm);
1231 }
1232 JRT_END
1233
1234 #else // DEOPTIMIZE_WHEN_PATCHING
1235
1236 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))
1237 RegisterMap reg_map(thread, false);
1238
1239 NOT_PRODUCT(_patch_code_slowcase_cnt++;)
1240 if (TracePatching) {
1241 tty->print_cr("Deoptimizing because patch is needed");
1242 }
1243
1244 frame runtime_frame = thread->last_frame();
1245 frame caller_frame = runtime_frame.sender(®_map);
1246
1247 // It's possible the nmethod was invalidated in the last
1248 // safepoint, but if it's still alive then make it not_entrant.
1249 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1250 if (nm != NULL) {
1251 nm->make_not_entrant();
1252 }
1253
1254 Deoptimization::deoptimize_frame(thread, caller_frame.id());
1255
1256 // Return to the now deoptimized frame.
1257 JRT_END
1258
1259 #endif // DEOPTIMIZE_WHEN_PATCHING
1260
1261 //
1262 // Entry point for compiled code. We want to patch a nmethod.
1263 // We don't do a normal VM transition here because we want to
1264 // know after the patching is complete and any safepoint(s) are taken
1265 // if the calling nmethod was deoptimized. We do this by calling a
1266 // helper method which does the normal VM transition and when it
1267 // completes we can check for deoptimization. This simplifies the
1268 // assembly code in the cpu directories.
1269 //
1270 int Runtime1::move_klass_patching(JavaThread* thread) {
1271 //
1272 // NOTE: we are still in Java
1273 //
1274 Thread* THREAD = thread;
1275 debug_only(NoHandleMark nhm;)
1276 {
1277 // Enter VM mode
1278
1279 ResetNoHandleMark rnhm;
1280 patch_code(thread, load_klass_patching_id);
1281 }
1282 // Back in JAVA, use no oops DON'T safepoint
1283
1284 // Return true if calling code is deoptimized
1285
1286 return caller_is_deopted();
1287 }
1288
1289 int Runtime1::move_mirror_patching(JavaThread* thread) {
1290 //
1291 // NOTE: we are still in Java
1292 //
1293 Thread* THREAD = thread;
1294 debug_only(NoHandleMark nhm;)
1295 {
1296 // Enter VM mode
1297
1298 ResetNoHandleMark rnhm;
1299 patch_code(thread, load_mirror_patching_id);
1300 }
1301 // Back in JAVA, use no oops DON'T safepoint
1302
1303 // Return true if calling code is deoptimized
1304
1305 return caller_is_deopted();
1306 }
1307
1308 int Runtime1::move_appendix_patching(JavaThread* thread) {
1309 //
1310 // NOTE: we are still in Java
1311 //
1312 Thread* THREAD = thread;
1313 debug_only(NoHandleMark nhm;)
1314 {
1315 // Enter VM mode
1316
1317 ResetNoHandleMark rnhm;
1318 patch_code(thread, load_appendix_patching_id);
1319 }
1320 // Back in JAVA, use no oops DON'T safepoint
1321
1322 // Return true if calling code is deoptimized
1323
1324 return caller_is_deopted();
1325 }
1326 //
1327 // Entry point for compiled code. We want to patch a nmethod.
1328 // We don't do a normal VM transition here because we want to
1329 // know after the patching is complete and any safepoint(s) are taken
1330 // if the calling nmethod was deoptimized. We do this by calling a
1331 // helper method which does the normal VM transition and when it
1332 // completes we can check for deoptimization. This simplifies the
1333 // assembly code in the cpu directories.
1334 //
1335
1336 int Runtime1::access_field_patching(JavaThread* thread) {
1337 //
1338 // NOTE: we are still in Java
1339 //
1340 Thread* THREAD = thread;
1341 debug_only(NoHandleMark nhm;)
1342 {
1343 // Enter VM mode
1344
1345 ResetNoHandleMark rnhm;
1346 patch_code(thread, access_field_patching_id);
1347 }
1348 // Back in JAVA, use no oops DON'T safepoint
1349
1350 // Return true if calling code is deoptimized
1351
1352 return caller_is_deopted();
1353 JRT_END
1354
1355
1356 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id))
1357 // for now we just print out the block id
1358 tty->print("%d ", block_id);
1359 JRT_END
1360
1361
1362 JRT_LEAF(int, Runtime1::is_instance_of(oopDesc* mirror, oopDesc* obj))
1363 // had to return int instead of bool, otherwise there may be a mismatch
1364 // between the C calling convention and the Java one.
1365 // e.g., on x86, GCC may clear only %al when returning a bool false, but
1366 // JVM takes the whole %eax as the return value, which may misinterpret
1367 // the return value as a boolean true.
1368
1369 assert(mirror != NULL, "should null-check on mirror before calling");
1370 Klass* k = java_lang_Class::as_Klass(mirror);
1371 return (k != NULL && obj != NULL && obj->is_a(k)) ? 1 : 0;
1372 JRT_END
1373
1374 JRT_ENTRY(void, Runtime1::predicate_failed_trap(JavaThread* thread))
1375 ResourceMark rm;
1376
1377 assert(!TieredCompilation, "incompatible with tiered compilation");
1378
1379 RegisterMap reg_map(thread, false);
1380 frame runtime_frame = thread->last_frame();
1381 frame caller_frame = runtime_frame.sender(®_map);
1382
1383 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
1384 assert (nm != NULL, "no more nmethod?");
1385 nm->make_not_entrant();
1386
1387 methodHandle m(nm->method());
1388 MethodData* mdo = m->method_data();
1389
1390 if (mdo == NULL && !HAS_PENDING_EXCEPTION) {
1391 // Build an MDO. Ignore errors like OutOfMemory;
1392 // that simply means we won't have an MDO to update.
1393 Method::build_interpreter_method_data(m, THREAD);
1394 if (HAS_PENDING_EXCEPTION) {
1395 assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
1396 CLEAR_PENDING_EXCEPTION;
1397 }
1398 mdo = m->method_data();
1399 }
1400
1401 if (mdo != NULL) {
1402 mdo->inc_trap_count(Deoptimization::Reason_none);
1403 }
1404
1405 if (TracePredicateFailedTraps) {
1406 stringStream ss1, ss2;
1407 vframeStream vfst(thread);
1408 methodHandle inlinee = methodHandle(vfst.method());
1409 inlinee->print_short_name(&ss1);
1410 m->print_short_name(&ss2);
1411 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()));
1412 }
1413
1414
1415 Deoptimization::deoptimize_frame(thread, caller_frame.id());
1416
1417 JRT_END
1418
1419 #ifndef PRODUCT
1420 void Runtime1::print_statistics() {
1421 tty->print_cr("C1 Runtime statistics:");
1422 tty->print_cr(" _resolve_invoke_virtual_cnt: %d", SharedRuntime::_resolve_virtual_ctr);
1423 tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr);
1424 tty->print_cr(" _resolve_invoke_static_cnt: %d", SharedRuntime::_resolve_static_ctr);
1425 tty->print_cr(" _handle_wrong_method_cnt: %d", SharedRuntime::_wrong_method_ctr);
1426 tty->print_cr(" _ic_miss_cnt: %d", SharedRuntime::_ic_miss_ctr);
1427 tty->print_cr(" _generic_arraycopy_cnt: %d", _generic_arraycopy_cnt);
1428 tty->print_cr(" _generic_arraycopystub_cnt: %d", _generic_arraycopystub_cnt);
1429 tty->print_cr(" _byte_arraycopy_cnt: %d", _byte_arraycopy_stub_cnt);
1430 tty->print_cr(" _short_arraycopy_cnt: %d", _short_arraycopy_stub_cnt);
1431 tty->print_cr(" _int_arraycopy_cnt: %d", _int_arraycopy_stub_cnt);
1432 tty->print_cr(" _long_arraycopy_cnt: %d", _long_arraycopy_stub_cnt);
1433 tty->print_cr(" _oop_arraycopy_cnt: %d", _oop_arraycopy_stub_cnt);
1434 tty->print_cr(" _arraycopy_slowcase_cnt: %d", _arraycopy_slowcase_cnt);
1435 tty->print_cr(" _arraycopy_checkcast_cnt: %d", _arraycopy_checkcast_cnt);
1436 tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt);
1437
1438 tty->print_cr(" _new_type_array_slowcase_cnt: %d", _new_type_array_slowcase_cnt);
1439 tty->print_cr(" _new_object_array_slowcase_cnt: %d", _new_object_array_slowcase_cnt);
1440 tty->print_cr(" _new_instance_slowcase_cnt: %d", _new_instance_slowcase_cnt);
1441 tty->print_cr(" _new_multi_array_slowcase_cnt: %d", _new_multi_array_slowcase_cnt);
1442 tty->print_cr(" _monitorenter_slowcase_cnt: %d", _monitorenter_slowcase_cnt);
1443 tty->print_cr(" _monitorexit_slowcase_cnt: %d", _monitorexit_slowcase_cnt);
1444 tty->print_cr(" _patch_code_slowcase_cnt: %d", _patch_code_slowcase_cnt);
1445
1446 tty->print_cr(" _throw_range_check_exception_count: %d:", _throw_range_check_exception_count);
1447 tty->print_cr(" _throw_index_exception_count: %d:", _throw_index_exception_count);
1448 tty->print_cr(" _throw_div0_exception_count: %d:", _throw_div0_exception_count);
1449 tty->print_cr(" _throw_null_pointer_exception_count: %d:", _throw_null_pointer_exception_count);
1450 tty->print_cr(" _throw_class_cast_exception_count: %d:", _throw_class_cast_exception_count);
1451 tty->print_cr(" _throw_incompatible_class_change_error_count: %d:", _throw_incompatible_class_change_error_count);
1452 tty->print_cr(" _throw_array_store_exception_count: %d:", _throw_array_store_exception_count);
1453 tty->print_cr(" _throw_count: %d:", _throw_count);
1454
1455 SharedRuntime::print_ic_miss_histogram();
1456 tty->cr();
1457 }
1458 #endif // PRODUCT