1 /*
2 * Copyright (c) 1999, 2020, 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 "classfile/javaClasses.hpp"
32 #include "nativeInst_x86.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 #ifndef _LP64
42 float ConversionStub::float_zero = 0.0;
43 double ConversionStub::double_zero = 0.0;
44
45 void ConversionStub::emit_code(LIR_Assembler* ce) {
46 __ bind(_entry);
47 assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
48
49
50 if (input()->is_single_xmm()) {
51 __ comiss(input()->as_xmm_float_reg(),
52 ExternalAddress((address)&float_zero));
53 } else if (input()->is_double_xmm()) {
54 __ comisd(input()->as_xmm_double_reg(),
55 ExternalAddress((address)&double_zero));
56 } else {
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 #endif // !_LP64
81
82 void C1SafepointPollStub::emit_code(LIR_Assembler* ce) {
83 __ bind(_entry);
84 InternalAddress safepoint_pc(ce->masm()->pc() - ce->masm()->offset() + safepoint_offset());
85 #ifdef _LP64
86 __ lea(rscratch1, safepoint_pc);
87 __ movptr(Address(r15_thread, JavaThread::saved_exception_pc_offset()), rscratch1);
88 #else
89 const Register tmp1 = rcx;
90 const Register tmp2 = rdx;
91 __ push(tmp1);
92 __ push(tmp2);
93
94 __ lea(tmp1, safepoint_pc);
95 __ get_thread(tmp2);
96 __ movptr(Address(tmp2, JavaThread::saved_exception_pc_offset()), tmp1);
97
98 __ pop(tmp2);
99 __ pop(tmp1);
100 #endif /* _LP64 */
101 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
102 "polling page return stub not created yet");
103
104 address stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
105 __ jump(RuntimeAddress(stub));
106 }
107
108 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
109 __ bind(_entry);
110 Metadata *m = _method->as_constant_ptr()->as_metadata();
111 ce->store_parameter(m, 1);
112 ce->store_parameter(_bci, 0);
113 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
114 ce->add_call_info_here(_info);
115 ce->verify_oop_map(_info);
116 __ jmp(_continuation);
117 }
118
119 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, LIR_Opr array)
120 : _index(index), _array(array), _throw_index_out_of_bounds_exception(false) {
121 assert(info != NULL, "must have info");
122 _info = new CodeEmitInfo(info);
123 }
124
125 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index)
126 : _index(index), _array(), _throw_index_out_of_bounds_exception(true) {
127 assert(info != NULL, "must have info");
128 _info = new CodeEmitInfo(info);
129 }
130
131 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
132 __ bind(_entry);
133 if (_info->deoptimize_on_exception()) {
134 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
135 __ call(RuntimeAddress(a));
136 ce->add_call_info_here(_info);
137 ce->verify_oop_map(_info);
138 debug_only(__ should_not_reach_here());
139 return;
140 }
141
142 // pass the array index on stack because all registers must be preserved
143 if (_index->is_cpu_register()) {
144 ce->store_parameter(_index->as_register(), 0);
145 } else {
146 ce->store_parameter(_index->as_jint(), 0);
147 }
148 Runtime1::StubID stub_id;
149 if (_throw_index_out_of_bounds_exception) {
150 stub_id = Runtime1::throw_index_exception_id;
151 } else {
152 stub_id = Runtime1::throw_range_check_failed_id;
153 ce->store_parameter(_array->as_pointer_register(), 1);
154 }
155 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
156 ce->add_call_info_here(_info);
157 ce->verify_oop_map(_info);
158 debug_only(__ should_not_reach_here());
159 }
160
161 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
162 _info = new CodeEmitInfo(info);
163 }
164
165 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
166 __ bind(_entry);
167 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
168 __ call(RuntimeAddress(a));
169 ce->add_call_info_here(_info);
170 ce->verify_oop_map(_info);
171 debug_only(__ should_not_reach_here());
172 }
173
174 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
175 if (_offset != -1) {
176 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
177 }
178 __ bind(_entry);
179 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
180 ce->add_call_info_here(_info);
181 debug_only(__ should_not_reach_here());
182 }
183
184
185 // Implementation of NewInstanceStub
186
187 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
188 _result = result;
189 _klass = klass;
190 _klass_reg = klass_reg;
191 _info = new CodeEmitInfo(info);
192 assert(stub_id == Runtime1::new_instance_id ||
193 stub_id == Runtime1::fast_new_instance_id ||
194 stub_id == Runtime1::fast_new_instance_init_check_id,
195 "need new_instance id");
196 _stub_id = stub_id;
197 }
198
199
200 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
201 assert(__ rsp_offset() == 0, "frame size should be fixed");
202 __ bind(_entry);
203 __ movptr(rdx, _klass_reg->as_register());
204 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
205 ce->add_call_info_here(_info);
206 ce->verify_oop_map(_info);
207 assert(_result->as_register() == rax, "result must in rax,");
208 __ jmp(_continuation);
209 }
210
211
212 // Implementation of NewTypeArrayStub
213
214 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
215 _klass_reg = klass_reg;
216 _length = length;
217 _result = result;
218 _info = new CodeEmitInfo(info);
219 }
220
221
222 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
223 assert(__ rsp_offset() == 0, "frame size should be fixed");
224 __ bind(_entry);
225 assert(_length->as_register() == rbx, "length must in rbx,");
226 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
227 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
228 ce->add_call_info_here(_info);
229 ce->verify_oop_map(_info);
230 assert(_result->as_register() == rax, "result must in rax,");
231 __ jmp(_continuation);
232 }
233
234
235 // Implementation of NewObjectArrayStub
236
237 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
238 _klass_reg = klass_reg;
239 _result = result;
240 _length = length;
241 _info = new CodeEmitInfo(info);
242 }
243
244
245 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
246 assert(__ rsp_offset() == 0, "frame size should be fixed");
247 __ bind(_entry);
248 assert(_length->as_register() == rbx, "length must in rbx,");
249 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
250 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
251 ce->add_call_info_here(_info);
252 ce->verify_oop_map(_info);
253 assert(_result->as_register() == rax, "result must in rax,");
254 __ jmp(_continuation);
255 }
256
257
258 // Implementation of MonitorAccessStubs
259
260 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, CodeEmitInfo* info)
261 : MonitorAccessStub(obj_reg)
262 {
263 _info = new CodeEmitInfo(info);
264 }
265
266
267 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
268 assert(__ rsp_offset() == 0, "frame size should be fixed");
269 __ bind(_entry);
270 ce->store_parameter(_obj_reg->as_register(), 0);
271 Runtime1::StubID enter_id;
272 if (ce->compilation()->has_fpu_code()) {
273 enter_id = Runtime1::monitorenter_id;
274 } else {
275 enter_id = Runtime1::monitorenter_nofpu_id;
276 }
277 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
278 ce->add_call_info_here(_info);
279 ce->verify_oop_map(_info);
280 __ jmp(_continuation);
281 }
282
283
284 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
285 __ bind(_entry);
286 ce->store_parameter(_obj_reg->as_register(), 0);
287 // note: non-blocking leaf routine => no call info needed
288 Runtime1::StubID exit_id;
289 if (ce->compilation()->has_fpu_code()) {
290 exit_id = Runtime1::monitorexit_id;
291 } else {
292 exit_id = Runtime1::monitorexit_nofpu_id;
293 }
294 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
295 __ jmp(_continuation);
296 }
297
298 void LoadKlassStub::emit_code(LIR_Assembler* ce) {
299 __ bind(_entry);
300 #ifdef _LP64
301 Register res = _result->as_register();
302 ce->store_parameter(_obj->as_register(), 0);
303 if (res != rax) {
304 // This preserves rax and allows it to be used as return-register,
305 // without messing with the stack.
306 __ xchgptr(rax, res);
307 }
308 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::load_klass_id)));
309 if (res != rax) {
310 // Swap back rax, and move result to correct register.
311 __ xchgptr(rax, res);
312 }
313 __ jmp(_continuation);
314 #else
315 __ should_not_reach_here();
316 #endif
317 }
318
319 // Implementation of patching:
320 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
321 // - Replace original code with a call to the stub
322 // At Runtime:
323 // - call to stub, jump to runtime
324 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
325 // - in runtime: after initializing class, restore original code, reexecute instruction
326
327 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
328
329 void PatchingStub::align_patch_site(MacroAssembler* masm) {
330 // We're patching a 5-7 byte instruction on intel and we need to
331 // make sure that we don't see a piece of the instruction. It
332 // appears mostly impossible on Intel to simply invalidate other
333 // processors caches and since they may do aggressive prefetch it's
334 // very hard to make a guess about what code might be in the icache.
335 // Force the instruction to be double word aligned so that it
336 // doesn't span a cache line.
337 masm->align(align_up((int)NativeGeneralJump::instruction_size, wordSize));
338 }
339
340 void PatchingStub::emit_code(LIR_Assembler* ce) {
341 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
342
343 Label call_patch;
344
345 // static field accesses have special semantics while the class
346 // initializer is being run so we emit a test which can be used to
347 // check that this code is being executed by the initializing
348 // thread.
349 address being_initialized_entry = __ pc();
350 if (CommentedAssembly) {
351 __ block_comment(" patch template");
352 }
353 if (_id == load_klass_id) {
354 // produce a copy of the load klass instruction for use by the being initialized case
355 #ifdef ASSERT
356 address start = __ pc();
357 #endif
358 Metadata* o = NULL;
359 __ mov_metadata(_obj, o);
360 #ifdef ASSERT
361 for (int i = 0; i < _bytes_to_copy; i++) {
362 address ptr = (address)(_pc_start + i);
363 int a_byte = (*ptr) & 0xFF;
364 assert(a_byte == *start++, "should be the same code");
365 }
366 #endif
367 } else if (_id == load_mirror_id) {
368 // produce a copy of the load mirror instruction for use by the being
369 // initialized case
370 #ifdef ASSERT
371 address start = __ pc();
372 #endif
373 jobject o = NULL;
374 __ movoop(_obj, o);
375 #ifdef ASSERT
376 for (int i = 0; i < _bytes_to_copy; i++) {
377 address ptr = (address)(_pc_start + i);
378 int a_byte = (*ptr) & 0xFF;
379 assert(a_byte == *start++, "should be the same code");
380 }
381 #endif
382 } else {
383 // make a copy the code which is going to be patched.
384 for (int i = 0; i < _bytes_to_copy; i++) {
385 address ptr = (address)(_pc_start + i);
386 int a_byte = (*ptr) & 0xFF;
387 __ emit_int8(a_byte);
388 *ptr = 0x90; // make the site look like a nop
389 }
390 }
391
392 address end_of_patch = __ pc();
393 int bytes_to_skip = 0;
394 if (_id == load_mirror_id) {
395 int offset = __ offset();
396 if (CommentedAssembly) {
397 __ block_comment(" being_initialized check");
398 }
399 assert(_obj != noreg, "must be a valid register");
400 Register tmp = rax;
401 Register tmp2 = rbx;
402 __ push(tmp);
403 __ push(tmp2);
404 // Load without verification to keep code size small. We need it because
405 // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null.
406 __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset()));
407 __ get_thread(tmp);
408 __ cmpptr(tmp, Address(tmp2, InstanceKlass::init_thread_offset()));
409 __ pop(tmp2);
410 __ pop(tmp);
411 __ jcc(Assembler::notEqual, call_patch);
412
413 // access_field patches may execute the patched code before it's
414 // copied back into place so we need to jump back into the main
415 // code of the nmethod to continue execution.
416 __ jmp(_patch_site_continuation);
417
418 // make sure this extra code gets skipped
419 bytes_to_skip += __ offset() - offset;
420 }
421 if (CommentedAssembly) {
422 __ block_comment("patch data encoded as movl");
423 }
424 // Now emit the patch record telling the runtime how to find the
425 // pieces of the patch. We only need 3 bytes but for readability of
426 // the disassembly we make the data look like a movl reg, imm32,
427 // which requires 5 bytes
428 int sizeof_patch_record = 5;
429 bytes_to_skip += sizeof_patch_record;
430
431 // emit the offsets needed to find the code to patch
432 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
433
434 __ emit_int8((unsigned char)0xB8);
435 __ emit_int8(0);
436 __ emit_int8(being_initialized_entry_offset);
437 __ emit_int8(bytes_to_skip);
438 __ emit_int8(_bytes_to_copy);
439 address patch_info_pc = __ pc();
440 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
441
442 address entry = __ pc();
443 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
444 address target = NULL;
445 relocInfo::relocType reloc_type = relocInfo::none;
446 switch (_id) {
447 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
448 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
449 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
450 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
451 default: ShouldNotReachHere();
452 }
453 __ bind(call_patch);
454
455 if (CommentedAssembly) {
456 __ block_comment("patch entry point");
457 }
458 __ call(RuntimeAddress(target));
459 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
460 ce->add_call_info_here(_info);
461 int jmp_off = __ offset();
462 __ jmp(_patch_site_entry);
463 // Add enough nops so deoptimization can overwrite the jmp above with a call
464 // and not destroy the world. We cannot use fat nops here, since the concurrent
465 // code rewrite may transiently create the illegal instruction sequence.
466 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
467 __ nop();
468 }
469 if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
470 CodeSection* cs = __ code_section();
471 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
472 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, reloc_type, relocInfo::none);
473 }
474 }
475
476
477 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
478 __ bind(_entry);
479 ce->store_parameter(_trap_request, 0);
480 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));
481 ce->add_call_info_here(_info);
482 DEBUG_ONLY(__ should_not_reach_here());
483 }
484
485
486 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
487 address a;
488 if (_info->deoptimize_on_exception()) {
489 // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
490 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
491 } else {
492 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
493 }
494
495 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
496 __ bind(_entry);
497 __ call(RuntimeAddress(a));
498 ce->add_call_info_here(_info);
499 ce->verify_oop_map(_info);
500 debug_only(__ should_not_reach_here());
501 }
502
503
504 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
505 assert(__ rsp_offset() == 0, "frame size should be fixed");
506
507 __ bind(_entry);
508 // pass the object on stack because all registers must be preserved
509 if (_obj->is_cpu_register()) {
510 ce->store_parameter(_obj->as_register(), 0);
511 }
512 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
513 ce->add_call_info_here(_info);
514 debug_only(__ should_not_reach_here());
515 }
516
517
518 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
519 //---------------slow case: call to native-----------------
520 __ bind(_entry);
521 // Figure out where the args should go
522 // This should really convert the IntrinsicID to the Method* and signature
523 // but I don't know how to do that.
524 //
525 VMRegPair args[5];
526 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
527 SharedRuntime::java_calling_convention(signature, args, 5);
528
529 // push parameters
530 // (src, src_pos, dest, destPos, length)
531 Register r[5];
532 r[0] = src()->as_register();
533 r[1] = src_pos()->as_register();
534 r[2] = dst()->as_register();
535 r[3] = dst_pos()->as_register();
536 r[4] = length()->as_register();
537
538 // next registers will get stored on the stack
539 for (int i = 0; i < 5 ; i++ ) {
540 VMReg r_1 = args[i].first();
541 if (r_1->is_stack()) {
542 int st_off = r_1->reg2stack() * wordSize;
543 __ movptr (Address(rsp, st_off), r[i]);
544 } else {
545 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
546 }
547 }
548
549 ce->align_call(lir_static_call);
550
551 ce->emit_static_call_stub();
552 if (ce->compilation()->bailed_out()) {
553 return; // CodeCache is full
554 }
555 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
556 relocInfo::static_call_type);
557 __ call(resolve);
558 ce->add_call_info_here(info());
559
560 #ifndef PRODUCT
561 if (PrintC1Statistics) {
562 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt), rscratch1);
563 }
564 #endif
565
566 __ jmp(_continuation);
567 }
568
569 #undef __