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 "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 _info = new CodeEmitInfo(info);
165 }
166
167
168 void LoadFlattenedArrayStub::emit_code(LIR_Assembler* ce) {
169 assert(__ rsp_offset() == 0, "frame size should be fixed");
170 __ bind(_entry);
171 ce->store_parameter(_array->as_register(), 1);
172 ce->store_parameter(_index->as_register(), 0);
173 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::load_flattened_array_id)));
174 ce->add_call_info_here(_info);
175 ce->verify_oop_map(_info);
176 if (_result->as_register() != rax) {
177 __ movptr(_result->as_register(), rax);
178 }
179 __ jmp(_continuation);
180 }
181
182
183 // Implementation of StoreFlattenedArrayStub
184
185 StoreFlattenedArrayStub::StoreFlattenedArrayStub(LIR_Opr array, LIR_Opr index, LIR_Opr value, CodeEmitInfo* info) {
186 _array = array;
187 _index = index;
188 _value = value;
189 _info = new CodeEmitInfo(info);
190 }
191
192
193 void StoreFlattenedArrayStub::emit_code(LIR_Assembler* ce) {
194 assert(__ rsp_offset() == 0, "frame size should be fixed");
195 __ bind(_entry);
196 ce->store_parameter(_array->as_register(), 2);
197 ce->store_parameter(_index->as_register(), 1);
198 ce->store_parameter(_value->as_register(), 0);
199 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::store_flattened_array_id)));
200 ce->add_call_info_here(_info);
201 ce->verify_oop_map(_info);
202 __ jmp(_continuation);
203 }
204
205
206 // Implementation of NewInstanceStub
207
208 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
209 _result = result;
210 _klass = klass;
211 _klass_reg = klass_reg;
212 _info = new CodeEmitInfo(info);
213 assert(stub_id == Runtime1::new_instance_id ||
214 stub_id == Runtime1::fast_new_instance_id ||
215 stub_id == Runtime1::fast_new_instance_init_check_id,
216 "need new_instance id");
217 _stub_id = stub_id;
218 }
219
220
221 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
222 assert(__ rsp_offset() == 0, "frame size should be fixed");
223 __ bind(_entry);
224 __ movptr(rdx, _klass_reg->as_register());
225 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
226 ce->add_call_info_here(_info);
227 ce->verify_oop_map(_info);
228 assert(_result->as_register() == rax, "result must in rax,");
229 __ jmp(_continuation);
230 }
231
232
233 // Implementation of NewTypeArrayStub
234
235 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
236 _klass_reg = klass_reg;
237 _length = length;
238 _result = result;
239 _info = new CodeEmitInfo(info);
240 }
241
242
243 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
244 assert(__ rsp_offset() == 0, "frame size should be fixed");
245 __ bind(_entry);
246 assert(_length->as_register() == rbx, "length must in rbx,");
247 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
248 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
249 ce->add_call_info_here(_info);
250 ce->verify_oop_map(_info);
251 assert(_result->as_register() == rax, "result must in rax,");
252 __ jmp(_continuation);
253 }
254
255
256 // Implementation of NewObjectArrayStub
257
258 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result,
259 CodeEmitInfo* info, bool is_value_type) {
260 _klass_reg = klass_reg;
261 _result = result;
262 _length = length;
263 _info = new CodeEmitInfo(info);
264 _is_value_type = is_value_type;
265 }
266
267
268 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
269 assert(__ rsp_offset() == 0, "frame size should be fixed");
270 __ bind(_entry);
271 assert(_length->as_register() == rbx, "length must in rbx,");
272 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
273 if (_is_value_type) {
274 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_value_array_id)));
275 } else {
276 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
277 }
278 ce->add_call_info_here(_info);
279 ce->verify_oop_map(_info);
280 assert(_result->as_register() == rax, "result must in rax,");
281 __ jmp(_continuation);
282 }
283
284
285 // Implementation of MonitorAccessStubs
286
287 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info, CodeStub* throw_imse_stub, LIR_Opr scratch_reg)
288 : MonitorAccessStub(obj_reg, lock_reg)
289 {
290 _info = new CodeEmitInfo(info);
291 _throw_imse_stub = throw_imse_stub;
292 _scratch_reg = scratch_reg;
293 if (_throw_imse_stub != NULL) {
294 assert(_scratch_reg != LIR_OprFact::illegalOpr, "must be");
295 }
296 }
297
298
299 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
300 assert(__ rsp_offset() == 0, "frame size should be fixed");
301 __ bind(_entry);
302 if (_throw_imse_stub != NULL) {
303 // When we come here, _obj_reg has already been checked to be non-null.
304 Register mark = _scratch_reg->as_register();
305 __ movptr(mark, Address(_obj_reg->as_register(), oopDesc::mark_offset_in_bytes()));
306 __ testl(mark, markOopDesc::always_locked_pattern);
307 __ jcc(Assembler::notZero, *_throw_imse_stub->entry());
308 }
309 ce->store_parameter(_obj_reg->as_register(), 1);
310 ce->store_parameter(_lock_reg->as_register(), 0);
311 Runtime1::StubID enter_id;
312 if (ce->compilation()->has_fpu_code()) {
313 enter_id = Runtime1::monitorenter_id;
314 } else {
315 enter_id = Runtime1::monitorenter_nofpu_id;
316 }
317 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
318 ce->add_call_info_here(_info);
319 ce->verify_oop_map(_info);
320 __ jmp(_continuation);
321 }
322
323
324 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
325 __ bind(_entry);
326 if (_compute_lock) {
327 // lock_reg was destroyed by fast unlocking attempt => recompute it
328 ce->monitor_address(_monitor_ix, _lock_reg);
329 }
330 ce->store_parameter(_lock_reg->as_register(), 0);
331 // note: non-blocking leaf routine => no call info needed
332 Runtime1::StubID exit_id;
333 if (ce->compilation()->has_fpu_code()) {
334 exit_id = Runtime1::monitorexit_id;
335 } else {
336 exit_id = Runtime1::monitorexit_nofpu_id;
337 }
338 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
339 __ jmp(_continuation);
340 }
341
342
343 // Implementation of patching:
344 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
345 // - Replace original code with a call to the stub
346 // At Runtime:
347 // - call to stub, jump to runtime
348 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
349 // - in runtime: after initializing class, restore original code, reexecute instruction
350
351 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
352
353 void PatchingStub::align_patch_site(MacroAssembler* masm) {
354 // We're patching a 5-7 byte instruction on intel and we need to
355 // make sure that we don't see a piece of the instruction. It
356 // appears mostly impossible on Intel to simply invalidate other
357 // processors caches and since they may do aggressive prefetch it's
358 // very hard to make a guess about what code might be in the icache.
359 // Force the instruction to be double word aligned so that it
360 // doesn't span a cache line.
361 masm->align(align_up((int)NativeGeneralJump::instruction_size, wordSize));
362 }
363
364 void PatchingStub::emit_code(LIR_Assembler* ce) {
365 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
366
367 Label call_patch;
368
369 // static field accesses have special semantics while the class
370 // initializer is being run so we emit a test which can be used to
371 // check that this code is being executed by the initializing
372 // thread.
373 address being_initialized_entry = __ pc();
374 if (CommentedAssembly) {
375 __ block_comment(" patch template");
376 }
377 if (_id == load_klass_id) {
378 // produce a copy of the load klass instruction for use by the being initialized case
379 #ifdef ASSERT
380 address start = __ pc();
381 #endif
382 Metadata* o = NULL;
383 __ mov_metadata(_obj, o);
384 #ifdef ASSERT
385 for (int i = 0; i < _bytes_to_copy; i++) {
386 address ptr = (address)(_pc_start + i);
387 int a_byte = (*ptr) & 0xFF;
388 assert(a_byte == *start++, "should be the same code");
389 }
390 #endif
391 } else if (_id == load_mirror_id) {
392 // produce a copy of the load mirror instruction for use by the being
393 // initialized case
394 #ifdef ASSERT
395 address start = __ pc();
396 #endif
397 jobject o = NULL;
398 __ movoop(_obj, o);
399 #ifdef ASSERT
400 for (int i = 0; i < _bytes_to_copy; i++) {
401 address ptr = (address)(_pc_start + i);
402 int a_byte = (*ptr) & 0xFF;
403 assert(a_byte == *start++, "should be the same code");
404 }
405 #endif
406 } else {
407 // make a copy the code which is going to be patched.
408 for (int i = 0; i < _bytes_to_copy; i++) {
409 address ptr = (address)(_pc_start + i);
410 int a_byte = (*ptr) & 0xFF;
411 __ emit_int8(a_byte);
412 *ptr = 0x90; // make the site look like a nop
413 }
414 }
415
416 address end_of_patch = __ pc();
417 int bytes_to_skip = 0;
418 if (_id == load_mirror_id) {
419 int offset = __ offset();
420 if (CommentedAssembly) {
421 __ block_comment(" being_initialized check");
422 }
423 assert(_obj != noreg, "must be a valid register");
424 Register tmp = rax;
425 Register tmp2 = rbx;
426 __ push(tmp);
427 __ push(tmp2);
428 // Load without verification to keep code size small. We need it because
429 // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null.
430 __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));
431 __ get_thread(tmp);
432 __ cmpptr(tmp, Address(tmp2, InstanceKlass::init_thread_offset()));
433 __ pop(tmp2);
434 __ pop(tmp);
435 __ jcc(Assembler::notEqual, call_patch);
436
437 // access_field patches may execute the patched code before it's
438 // copied back into place so we need to jump back into the main
439 // code of the nmethod to continue execution.
440 __ jmp(_patch_site_continuation);
441
442 // make sure this extra code gets skipped
443 bytes_to_skip += __ offset() - offset;
444 }
445 if (CommentedAssembly) {
446 __ block_comment("patch data encoded as movl");
447 }
448 // Now emit the patch record telling the runtime how to find the
449 // pieces of the patch. We only need 3 bytes but for readability of
450 // the disassembly we make the data look like a movl reg, imm32,
451 // which requires 5 bytes
452 int sizeof_patch_record = 5;
453 bytes_to_skip += sizeof_patch_record;
454
455 // emit the offsets needed to find the code to patch
456 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
457
458 __ emit_int8((unsigned char)0xB8);
459 __ emit_int8(0);
460 __ emit_int8(being_initialized_entry_offset);
461 __ emit_int8(bytes_to_skip);
462 __ emit_int8(_bytes_to_copy);
463 address patch_info_pc = __ pc();
464 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
465
466 address entry = __ pc();
467 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
468 address target = NULL;
469 relocInfo::relocType reloc_type = relocInfo::none;
470 switch (_id) {
471 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
472 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
473 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
474 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
475 default: ShouldNotReachHere();
476 }
477 __ bind(call_patch);
478
479 if (CommentedAssembly) {
480 __ block_comment("patch entry point");
481 }
482 __ call(RuntimeAddress(target));
483 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
484 ce->add_call_info_here(_info);
485 int jmp_off = __ offset();
486 __ jmp(_patch_site_entry);
487 // Add enough nops so deoptimization can overwrite the jmp above with a call
488 // and not destroy the world. We cannot use fat nops here, since the concurrent
489 // code rewrite may transiently create the illegal instruction sequence.
490 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
491 __ nop();
492 }
493 if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
494 CodeSection* cs = __ code_section();
495 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
496 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, reloc_type, relocInfo::none);
497 }
498 }
499
500
501 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
502 __ bind(_entry);
503 ce->store_parameter(_trap_request, 0);
504 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));
505 ce->add_call_info_here(_info);
506 DEBUG_ONLY(__ should_not_reach_here());
507 }
508
509
510 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
511 address a;
512 if (_info->deoptimize_on_exception()) {
513 // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
514 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
515 } else {
516 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
517 }
518
519 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
520 __ bind(_entry);
521 __ call(RuntimeAddress(a));
522 ce->add_call_info_here(_info);
523 ce->verify_oop_map(_info);
524 debug_only(__ should_not_reach_here());
525 }
526
527
528 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
529 assert(__ rsp_offset() == 0, "frame size should be fixed");
530
531 __ bind(_entry);
532 // pass the object on stack because all registers must be preserved
533 if (_obj->is_cpu_register()) {
534 ce->store_parameter(_obj->as_register(), 0);
535 }
536 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
537 ce->add_call_info_here(_info);
538 debug_only(__ should_not_reach_here());
539 }
540
541
542 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
543 //---------------slow case: call to native-----------------
544 __ bind(_entry);
545 // Figure out where the args should go
546 // This should really convert the IntrinsicID to the Method* and signature
547 // but I don't know how to do that.
548 //
549 VMRegPair args[5];
550 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
551 SharedRuntime::java_calling_convention(signature, args, 5, true);
552
553 // push parameters
554 // (src, src_pos, dest, destPos, length)
555 Register r[5];
556 r[0] = src()->as_register();
557 r[1] = src_pos()->as_register();
558 r[2] = dst()->as_register();
559 r[3] = dst_pos()->as_register();
560 r[4] = length()->as_register();
561
562 // next registers will get stored on the stack
563 for (int i = 0; i < 5 ; i++ ) {
564 VMReg r_1 = args[i].first();
565 if (r_1->is_stack()) {
566 int st_off = r_1->reg2stack() * wordSize;
567 __ movptr (Address(rsp, st_off), r[i]);
568 } else {
569 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
570 }
571 }
572
573 ce->align_call(lir_static_call);
574
575 ce->emit_static_call_stub();
576 if (ce->compilation()->bailed_out()) {
577 return; // CodeCache is full
578 }
579 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
580 relocInfo::static_call_type);
581 __ call(resolve);
582 ce->add_call_info_here(info());
583
584 #ifndef PRODUCT
585 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
586 #endif
587
588 __ jmp(_continuation);
589 }
590
591 #undef __