1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "c1/c1_CodeStubs.hpp"
27 #include "c1/c1_FrameMap.hpp"
28 #include "c1/c1_LIRAssembler.hpp"
29 #include "c1/c1_MacroAssembler.hpp"
30 #include "c1/c1_Runtime1.hpp"
31 #include "nativeInst_x86.hpp"
32 #include "oops/objArrayKlass.hpp"
33 #include "runtime/sharedRuntime.hpp"
34 #include "utilities/align.hpp"
35 #include "utilities/macros.hpp"
36 #include "vmreg_x86.inline.hpp"
37
38
39 #define __ ce->masm()->
40
41 float ConversionStub::float_zero = 0.0;
42 double ConversionStub::double_zero = 0.0;
43
44 void ConversionStub::emit_code(LIR_Assembler* ce) {
45 __ bind(_entry);
46 assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
47
48
49 if (input()->is_single_xmm()) {
50 __ comiss(input()->as_xmm_float_reg(),
51 ExternalAddress((address)&float_zero));
52 } else if (input()->is_double_xmm()) {
53 __ comisd(input()->as_xmm_double_reg(),
54 ExternalAddress((address)&double_zero));
55 } else {
56 LP64_ONLY(ShouldNotReachHere());
57 __ push(rax);
58 __ ftst();
59 __ fnstsw_ax();
60 __ sahf();
61 __ pop(rax);
62 }
63
64 Label NaN, do_return;
65 __ jccb(Assembler::parity, NaN);
66 __ jccb(Assembler::below, do_return);
67
68 // input is > 0 -> return maxInt
69 // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
70 __ decrement(result()->as_register());
71 __ jmpb(do_return);
72
73 // input is NaN -> return 0
74 __ bind(NaN);
75 __ xorptr(result()->as_register(), result()->as_register());
76
77 __ bind(do_return);
78 __ jmp(_continuation);
79 }
80
81 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
82 __ bind(_entry);
83 Metadata *m = _method->as_constant_ptr()->as_metadata();
84 ce->store_parameter(m, 1);
85 ce->store_parameter(_bci, 0);
86 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
87 ce->add_call_info_here(_info);
88 ce->verify_oop_map(_info);
89 __ jmp(_continuation);
90 }
91
92 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, LIR_Opr array)
93 : _index(index), _array(array), _throw_index_out_of_bounds_exception(false) {
94 assert(info != NULL, "must have info");
95 _info = new CodeEmitInfo(info);
96 }
97
98 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index)
99 : _index(index), _array(NULL), _throw_index_out_of_bounds_exception(true) {
100 assert(info != NULL, "must have info");
101 _info = new CodeEmitInfo(info);
102 }
103
104 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
105 __ bind(_entry);
106 if (_info->deoptimize_on_exception()) {
107 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
108 __ call(RuntimeAddress(a));
109 ce->add_call_info_here(_info);
110 ce->verify_oop_map(_info);
111 debug_only(__ should_not_reach_here());
112 return;
113 }
114
115 // pass the array index on stack because all registers must be preserved
116 if (_index->is_cpu_register()) {
117 ce->store_parameter(_index->as_register(), 0);
118 } else {
119 ce->store_parameter(_index->as_jint(), 0);
120 }
121 Runtime1::StubID stub_id;
122 if (_throw_index_out_of_bounds_exception) {
123 stub_id = Runtime1::throw_index_exception_id;
124 } else {
125 stub_id = Runtime1::throw_range_check_failed_id;
126 ce->store_parameter(_array->as_pointer_register(), 1);
127 }
128 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
129 ce->add_call_info_here(_info);
130 ce->verify_oop_map(_info);
131 debug_only(__ should_not_reach_here());
132 }
133
134 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
135 _info = new CodeEmitInfo(info);
136 }
137
138 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
139 __ bind(_entry);
140 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
141 __ call(RuntimeAddress(a));
142 ce->add_call_info_here(_info);
143 ce->verify_oop_map(_info);
144 debug_only(__ should_not_reach_here());
145 }
146
147 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
148 if (_offset != -1) {
149 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
150 }
151 __ bind(_entry);
152 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
153 ce->add_call_info_here(_info);
154 debug_only(__ should_not_reach_here());
155 }
156
157
158 // Implementation of LoadFlattenedArrayStub
159
160 LoadFlattenedArrayStub::LoadFlattenedArrayStub(LIR_Opr array, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) {
161 _array = array;
162 _index = index;
163 _result = result;
164 // Tell the register allocator that the runtime call will scratch rax.
165 _scratch_reg = FrameMap::rax_oop_opr;
166 _info = new CodeEmitInfo(info);
167 }
168
169 void LoadFlattenedArrayStub::emit_code(LIR_Assembler* ce) {
170 assert(__ rsp_offset() == 0, "frame size should be fixed");
171 __ bind(_entry);
172 ce->store_parameter(_array->as_register(), 1);
173 ce->store_parameter(_index->as_register(), 0);
174 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::load_flattened_array_id)));
175 ce->add_call_info_here(_info);
176 ce->verify_oop_map(_info);
177 if (_result->as_register() != rax) {
178 __ movptr(_result->as_register(), rax);
179 }
180 __ jmp(_continuation);
181 }
182
183
184 // Implementation of StoreFlattenedArrayStub
185
186 StoreFlattenedArrayStub::StoreFlattenedArrayStub(LIR_Opr array, LIR_Opr index, LIR_Opr value, CodeEmitInfo* info) {
187 _array = array;
188 _index = index;
189 _value = value;
190 // Tell the register allocator that the runtime call will scratch rax.
191 _scratch_reg = FrameMap::rax_oop_opr;
192 _info = new CodeEmitInfo(info);
193 }
194
195
196 void StoreFlattenedArrayStub::emit_code(LIR_Assembler* ce) {
197 assert(__ rsp_offset() == 0, "frame size should be fixed");
198 __ bind(_entry);
199 ce->store_parameter(_array->as_register(), 2);
200 ce->store_parameter(_index->as_register(), 1);
201 ce->store_parameter(_value->as_register(), 0);
202 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::store_flattened_array_id)));
203 ce->add_call_info_here(_info);
204 ce->verify_oop_map(_info);
205 __ jmp(_continuation);
206 }
207
208
209 // Implementation of NewInstanceStub
210
211 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
212 _result = result;
213 _klass = klass;
214 _klass_reg = klass_reg;
215 _info = new CodeEmitInfo(info);
216 assert(stub_id == Runtime1::new_instance_id ||
217 stub_id == Runtime1::fast_new_instance_id ||
218 stub_id == Runtime1::fast_new_instance_init_check_id,
219 "need new_instance id");
220 _stub_id = stub_id;
221 }
222
223
224 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
225 assert(__ rsp_offset() == 0, "frame size should be fixed");
226 __ bind(_entry);
227 __ movptr(rdx, _klass_reg->as_register());
228 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
229 ce->add_call_info_here(_info);
230 ce->verify_oop_map(_info);
231 assert(_result->as_register() == rax, "result must in rax,");
232 __ jmp(_continuation);
233 }
234
235
236 // Implementation of NewTypeArrayStub
237
238 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
239 _klass_reg = klass_reg;
240 _length = length;
241 _result = result;
242 _info = new CodeEmitInfo(info);
243 }
244
245
246 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
247 assert(__ rsp_offset() == 0, "frame size should be fixed");
248 __ bind(_entry);
249 assert(_length->as_register() == rbx, "length must in rbx,");
250 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
251 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
252 ce->add_call_info_here(_info);
253 ce->verify_oop_map(_info);
254 assert(_result->as_register() == rax, "result must in rax,");
255 __ jmp(_continuation);
256 }
257
258
259 // Implementation of NewObjectArrayStub
260
261 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result,
262 CodeEmitInfo* info, bool is_value_type) {
263 _klass_reg = klass_reg;
264 _result = result;
265 _length = length;
266 _info = new CodeEmitInfo(info);
267 _is_value_type = is_value_type;
268 }
269
270
271 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
272 assert(__ rsp_offset() == 0, "frame size should be fixed");
273 __ bind(_entry);
274 assert(_length->as_register() == rbx, "length must in rbx,");
275 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
276 if (_is_value_type) {
277 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_value_array_id)));
278 } else {
279 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
280 }
281 ce->add_call_info_here(_info);
282 ce->verify_oop_map(_info);
283 assert(_result->as_register() == rax, "result must in rax,");
284 __ jmp(_continuation);
285 }
286
287
288 // Implementation of MonitorAccessStubs
289
290 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info, CodeStub* throw_imse_stub, LIR_Opr scratch_reg)
291 : MonitorAccessStub(obj_reg, lock_reg)
292 {
293 _info = new CodeEmitInfo(info);
294 _throw_imse_stub = throw_imse_stub;
295 _scratch_reg = scratch_reg;
296 if (_throw_imse_stub != NULL) {
297 assert(_scratch_reg != LIR_OprFact::illegalOpr, "must be");
298 }
299 }
300
301
302 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
303 assert(__ rsp_offset() == 0, "frame size should be fixed");
304 __ bind(_entry);
305 if (_throw_imse_stub != NULL) {
306 // When we come here, _obj_reg has already been checked to be non-null.
307 Register mark = _scratch_reg->as_register();
308 __ movptr(mark, Address(_obj_reg->as_register(), oopDesc::mark_offset_in_bytes()));
309 __ testl(mark, markOopDesc::always_locked_pattern);
310 __ jcc(Assembler::notZero, *_throw_imse_stub->entry());
311 }
312 ce->store_parameter(_obj_reg->as_register(), 1);
313 ce->store_parameter(_lock_reg->as_register(), 0);
314 Runtime1::StubID enter_id;
315 if (ce->compilation()->has_fpu_code()) {
316 enter_id = Runtime1::monitorenter_id;
317 } else {
318 enter_id = Runtime1::monitorenter_nofpu_id;
319 }
320 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
321 ce->add_call_info_here(_info);
322 ce->verify_oop_map(_info);
323 __ jmp(_continuation);
324 }
325
326
327 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
328 __ bind(_entry);
329 if (_compute_lock) {
330 // lock_reg was destroyed by fast unlocking attempt => recompute it
331 ce->monitor_address(_monitor_ix, _lock_reg);
332 }
333 ce->store_parameter(_lock_reg->as_register(), 0);
334 // note: non-blocking leaf routine => no call info needed
335 Runtime1::StubID exit_id;
336 if (ce->compilation()->has_fpu_code()) {
337 exit_id = Runtime1::monitorexit_id;
338 } else {
339 exit_id = Runtime1::monitorexit_nofpu_id;
340 }
341 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
342 __ jmp(_continuation);
343 }
344
345
346 // Implementation of patching:
347 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
348 // - Replace original code with a call to the stub
349 // At Runtime:
350 // - call to stub, jump to runtime
351 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
352 // - in runtime: after initializing class, restore original code, reexecute instruction
353
354 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
355
356 void PatchingStub::align_patch_site(MacroAssembler* masm) {
357 // We're patching a 5-7 byte instruction on intel and we need to
358 // make sure that we don't see a piece of the instruction. It
359 // appears mostly impossible on Intel to simply invalidate other
360 // processors caches and since they may do aggressive prefetch it's
361 // very hard to make a guess about what code might be in the icache.
362 // Force the instruction to be double word aligned so that it
363 // doesn't span a cache line.
364 masm->align(align_up((int)NativeGeneralJump::instruction_size, wordSize));
365 }
366
367 void PatchingStub::emit_code(LIR_Assembler* ce) {
368 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
369
370 Label call_patch;
371
372 // static field accesses have special semantics while the class
373 // initializer is being run so we emit a test which can be used to
374 // check that this code is being executed by the initializing
375 // thread.
376 address being_initialized_entry = __ pc();
377 if (CommentedAssembly) {
378 __ block_comment(" patch template");
379 }
380 if (_id == load_klass_id) {
381 // produce a copy of the load klass instruction for use by the being initialized case
382 #ifdef ASSERT
383 address start = __ pc();
384 #endif
385 Metadata* o = NULL;
386 __ mov_metadata(_obj, o);
387 #ifdef ASSERT
388 for (int i = 0; i < _bytes_to_copy; i++) {
389 address ptr = (address)(_pc_start + i);
390 int a_byte = (*ptr) & 0xFF;
391 assert(a_byte == *start++, "should be the same code");
392 }
393 #endif
394 } else if (_id == load_mirror_id) {
395 // produce a copy of the load mirror instruction for use by the being
396 // initialized case
397 #ifdef ASSERT
398 address start = __ pc();
399 #endif
400 jobject o = NULL;
401 __ movoop(_obj, o);
402 #ifdef ASSERT
403 for (int i = 0; i < _bytes_to_copy; i++) {
404 address ptr = (address)(_pc_start + i);
405 int a_byte = (*ptr) & 0xFF;
406 assert(a_byte == *start++, "should be the same code");
407 }
408 #endif
409 } else {
410 // make a copy the code which is going to be patched.
411 for (int i = 0; i < _bytes_to_copy; i++) {
412 address ptr = (address)(_pc_start + i);
413 int a_byte = (*ptr) & 0xFF;
414 __ emit_int8(a_byte);
415 *ptr = 0x90; // make the site look like a nop
416 }
417 }
418
419 address end_of_patch = __ pc();
420 int bytes_to_skip = 0;
421 if (_id == load_mirror_id) {
422 int offset = __ offset();
423 if (CommentedAssembly) {
424 __ block_comment(" being_initialized check");
425 }
426 assert(_obj != noreg, "must be a valid register");
427 Register tmp = rax;
428 Register tmp2 = rbx;
429 __ push(tmp);
430 __ push(tmp2);
431 // Load without verification to keep code size small. We need it because
432 // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null.
433 __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));
434 __ get_thread(tmp);
435 __ cmpptr(tmp, Address(tmp2, InstanceKlass::init_thread_offset()));
436 __ pop(tmp2);
437 __ pop(tmp);
438 __ jcc(Assembler::notEqual, call_patch);
439
440 // access_field patches may execute the patched code before it's
441 // copied back into place so we need to jump back into the main
442 // code of the nmethod to continue execution.
443 __ jmp(_patch_site_continuation);
444
445 // make sure this extra code gets skipped
446 bytes_to_skip += __ offset() - offset;
447 }
448 if (CommentedAssembly) {
449 __ block_comment("patch data encoded as movl");
450 }
451 // Now emit the patch record telling the runtime how to find the
452 // pieces of the patch. We only need 3 bytes but for readability of
453 // the disassembly we make the data look like a movl reg, imm32,
454 // which requires 5 bytes
455 int sizeof_patch_record = 5;
456 bytes_to_skip += sizeof_patch_record;
457
458 // emit the offsets needed to find the code to patch
459 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
460
461 __ emit_int8((unsigned char)0xB8);
462 __ emit_int8(0);
463 __ emit_int8(being_initialized_entry_offset);
464 __ emit_int8(bytes_to_skip);
465 __ emit_int8(_bytes_to_copy);
466 address patch_info_pc = __ pc();
467 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
468
469 address entry = __ pc();
470 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
471 address target = NULL;
472 relocInfo::relocType reloc_type = relocInfo::none;
473 switch (_id) {
474 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
475 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
476 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
477 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
478 default: ShouldNotReachHere();
479 }
480 __ bind(call_patch);
481
482 if (CommentedAssembly) {
483 __ block_comment("patch entry point");
484 }
485 __ call(RuntimeAddress(target));
486 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
487 ce->add_call_info_here(_info);
488 int jmp_off = __ offset();
489 __ jmp(_patch_site_entry);
490 // Add enough nops so deoptimization can overwrite the jmp above with a call
491 // and not destroy the world. We cannot use fat nops here, since the concurrent
492 // code rewrite may transiently create the illegal instruction sequence.
493 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
494 __ nop();
495 }
496 if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
497 CodeSection* cs = __ code_section();
498 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
499 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, reloc_type, relocInfo::none);
500 }
501 }
502
503
504 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
505 __ bind(_entry);
506 ce->store_parameter(_trap_request, 0);
507 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));
508 ce->add_call_info_here(_info);
509 DEBUG_ONLY(__ should_not_reach_here());
510 }
511
512
513 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
514 address a;
515 if (_info->deoptimize_on_exception()) {
516 // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
517 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
518 } else {
519 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
520 }
521
522 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
523 __ bind(_entry);
524 __ call(RuntimeAddress(a));
525 ce->add_call_info_here(_info);
526 ce->verify_oop_map(_info);
527 debug_only(__ should_not_reach_here());
528 }
529
530
531 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
532 assert(__ rsp_offset() == 0, "frame size should be fixed");
533
534 __ bind(_entry);
535 // pass the object on stack because all registers must be preserved
536 if (_obj->is_cpu_register()) {
537 ce->store_parameter(_obj->as_register(), 0);
538 }
539 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
540 ce->add_call_info_here(_info);
541 debug_only(__ should_not_reach_here());
542 }
543
544
545 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
546 //---------------slow case: call to native-----------------
547 __ bind(_entry);
548 // Figure out where the args should go
549 // This should really convert the IntrinsicID to the Method* and signature
550 // but I don't know how to do that.
551 //
552 VMRegPair args[5];
553 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
554 SharedRuntime::java_calling_convention(signature, args, 5, true);
555
556 // push parameters
557 // (src, src_pos, dest, destPos, length)
558 Register r[5];
559 r[0] = src()->as_register();
560 r[1] = src_pos()->as_register();
561 r[2] = dst()->as_register();
562 r[3] = dst_pos()->as_register();
563 r[4] = length()->as_register();
564
565 // next registers will get stored on the stack
566 for (int i = 0; i < 5 ; i++ ) {
567 VMReg r_1 = args[i].first();
568 if (r_1->is_stack()) {
569 int st_off = r_1->reg2stack() * wordSize;
570 __ movptr (Address(rsp, st_off), r[i]);
571 } else {
572 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
573 }
574 }
575
576 ce->align_call(lir_static_call);
577
578 ce->emit_static_call_stub();
579 if (ce->compilation()->bailed_out()) {
580 return; // CodeCache is full
581 }
582 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
583 relocInfo::static_call_type);
584 __ call(resolve);
585 ce->add_call_info_here(info());
586
587 #ifndef PRODUCT
588 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
589 #endif
590
591 __ jmp(_continuation);
592 }
593
594 #undef __