1 /*
2 * Copyright (c) 1999, 2015, 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 "runtime/sharedRuntime.hpp"
33 #include "utilities/macros.hpp"
34 #include "vmreg_x86.inline.hpp"
35 #if INCLUDE_ALL_GCS
36 #include "gc/g1/g1SATBCardTableModRefBS.hpp"
37 #endif // INCLUDE_ALL_GCS
38
39
40 #define __ ce->masm()->
41
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 LP64_ONLY(ShouldNotReachHere());
58 __ push(rax);
59 __ ftst();
60 __ fnstsw_ax();
61 __ sahf();
62 __ pop(rax);
63 }
64
65 Label NaN, do_return;
66 __ jccb(Assembler::parity, NaN);
67 __ jccb(Assembler::below, do_return);
68
69 // input is > 0 -> return maxInt
70 // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
71 __ decrement(result()->as_register());
72 __ jmpb(do_return);
73
74 // input is NaN -> return 0
75 __ bind(NaN);
76 __ xorptr(result()->as_register(), result()->as_register());
77
78 __ bind(do_return);
79 __ jmp(_continuation);
80 }
81
82 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
83 __ bind(_entry);
84 Metadata *m = _method->as_constant_ptr()->as_metadata();
85 ce->store_parameter(m, 1);
86 ce->store_parameter(_bci, 0);
87 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
88 ce->add_call_info_here(_info);
89 ce->verify_oop_map(_info);
90 __ jmp(_continuation);
91 }
92
93 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
94 bool throw_index_out_of_bounds_exception)
95 : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
96 , _index(index)
97 {
98 assert(info != NULL, "must have info");
99 _info = new CodeEmitInfo(info);
100 }
101
102
103 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
104 __ bind(_entry);
105 if (_info->deoptimize_on_exception()) {
106 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
107 __ call(RuntimeAddress(a));
108 ce->add_call_info_here(_info);
109 ce->verify_oop_map(_info);
110 debug_only(__ should_not_reach_here());
111 return;
112 }
113
114 // pass the array index on stack because all registers must be preserved
115 if (_index->is_cpu_register()) {
116 ce->store_parameter(_index->as_register(), 0);
117 } else {
118 ce->store_parameter(_index->as_jint(), 0);
119 }
120 Runtime1::StubID stub_id;
121 if (_throw_index_out_of_bounds_exception) {
122 stub_id = Runtime1::throw_index_exception_id;
123 } else {
124 stub_id = Runtime1::throw_range_check_failed_id;
125 }
126 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
127 ce->add_call_info_here(_info);
128 ce->verify_oop_map(_info);
129 debug_only(__ should_not_reach_here());
130 }
131
132 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
133 _info = new CodeEmitInfo(info);
134 }
135
136 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
137 __ bind(_entry);
138 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
139 __ call(RuntimeAddress(a));
140 ce->add_call_info_here(_info);
141 ce->verify_oop_map(_info);
142 debug_only(__ should_not_reach_here());
143 }
144
145 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
146 if (_offset != -1) {
147 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
148 }
149 __ bind(_entry);
150 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
151 ce->add_call_info_here(_info);
152 debug_only(__ should_not_reach_here());
153 }
154
155
156 // Implementation of NewInstanceStub
157
158 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
159 _result = result;
160 _klass = klass;
161 _klass_reg = klass_reg;
162 _info = new CodeEmitInfo(info);
163 assert(stub_id == Runtime1::new_instance_id ||
164 stub_id == Runtime1::fast_new_instance_id ||
165 stub_id == Runtime1::fast_new_instance_init_check_id,
166 "need new_instance id");
167 _stub_id = stub_id;
168 }
169
170
171 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
172 assert(__ rsp_offset() == 0, "frame size should be fixed");
173 __ bind(_entry);
174 __ movptr(rdx, _klass_reg->as_register());
175 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
176 ce->add_call_info_here(_info);
177 ce->verify_oop_map(_info);
178 assert(_result->as_register() == rax, "result must in rax,");
179 __ jmp(_continuation);
180 }
181
182
183 // Implementation of NewTypeArrayStub
184
185 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
186 _klass_reg = klass_reg;
187 _length = length;
188 _result = result;
189 _info = new CodeEmitInfo(info);
190 }
191
192
193 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
194 assert(__ rsp_offset() == 0, "frame size should be fixed");
195 __ bind(_entry);
196 assert(_length->as_register() == rbx, "length must in rbx,");
197 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
198 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
199 ce->add_call_info_here(_info);
200 ce->verify_oop_map(_info);
201 assert(_result->as_register() == rax, "result must in rax,");
202 __ jmp(_continuation);
203 }
204
205
206 // Implementation of NewObjectArrayStub
207
208 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
209 _klass_reg = klass_reg;
210 _result = result;
211 _length = length;
212 _info = new CodeEmitInfo(info);
213 }
214
215
216 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
217 assert(__ rsp_offset() == 0, "frame size should be fixed");
218 __ bind(_entry);
219 assert(_length->as_register() == rbx, "length must in rbx,");
220 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
221 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
222 ce->add_call_info_here(_info);
223 ce->verify_oop_map(_info);
224 assert(_result->as_register() == rax, "result must in rax,");
225 __ jmp(_continuation);
226 }
227
228
229 // Implementation of MonitorAccessStubs
230
231 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
232 : MonitorAccessStub(obj_reg, lock_reg)
233 {
234 _info = new CodeEmitInfo(info);
235 }
236
237
238 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
239 assert(__ rsp_offset() == 0, "frame size should be fixed");
240 __ bind(_entry);
241 ce->store_parameter(_obj_reg->as_register(), 1);
242 ce->store_parameter(_lock_reg->as_register(), 0);
243 Runtime1::StubID enter_id;
244 if (ce->compilation()->has_fpu_code()) {
245 enter_id = Runtime1::monitorenter_id;
246 } else {
247 enter_id = Runtime1::monitorenter_nofpu_id;
248 }
249 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
250 ce->add_call_info_here(_info);
251 ce->verify_oop_map(_info);
252 __ jmp(_continuation);
253 }
254
255
256 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
257 __ bind(_entry);
258 if (_compute_lock) {
259 // lock_reg was destroyed by fast unlocking attempt => recompute it
260 ce->monitor_address(_monitor_ix, _lock_reg);
261 }
262 ce->store_parameter(_lock_reg->as_register(), 0);
263 // note: non-blocking leaf routine => no call info needed
264 Runtime1::StubID exit_id;
265 if (ce->compilation()->has_fpu_code()) {
266 exit_id = Runtime1::monitorexit_id;
267 } else {
268 exit_id = Runtime1::monitorexit_nofpu_id;
269 }
270 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
271 __ jmp(_continuation);
272 }
273
274
275 // Implementation of patching:
276 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
277 // - Replace original code with a call to the stub
278 // At Runtime:
279 // - call to stub, jump to runtime
280 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
281 // - in runtime: after initializing class, restore original code, reexecute instruction
282
283 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
284
285 void PatchingStub::align_patch_site(MacroAssembler* masm) {
286 // We're patching a 5-7 byte instruction on intel and we need to
287 // make sure that we don't see a piece of the instruction. It
288 // appears mostly impossible on Intel to simply invalidate other
289 // processors caches and since they may do aggressive prefetch it's
290 // very hard to make a guess about what code might be in the icache.
291 // Force the instruction to be double word aligned so that it
292 // doesn't span a cache line.
293 masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
294 }
295
296 void PatchingStub::emit_code(LIR_Assembler* ce) {
297 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
298
299 Label call_patch;
300
301 // static field accesses have special semantics while the class
302 // initializer is being run so we emit a test which can be used to
303 // check that this code is being executed by the initializing
304 // thread.
305 address being_initialized_entry = __ pc();
306 if (CommentedAssembly) {
307 __ block_comment(" patch template");
308 }
309 if (_id == load_klass_id) {
310 // produce a copy of the load klass instruction for use by the being initialized case
311 #ifdef ASSERT
312 address start = __ pc();
313 #endif
314 Metadata* o = NULL;
315 __ mov_metadata(_obj, o);
316 #ifdef ASSERT
317 for (int i = 0; i < _bytes_to_copy; i++) {
318 address ptr = (address)(_pc_start + i);
319 int a_byte = (*ptr) & 0xFF;
320 assert(a_byte == *start++, "should be the same code");
321 }
322 #endif
323 } else if (_id == load_mirror_id) {
324 // produce a copy of the load mirror instruction for use by the being
325 // initialized case
326 #ifdef ASSERT
327 address start = __ pc();
328 #endif
329 jobject o = NULL;
330 __ movoop(_obj, o);
331 #ifdef ASSERT
332 for (int i = 0; i < _bytes_to_copy; i++) {
333 address ptr = (address)(_pc_start + i);
334 int a_byte = (*ptr) & 0xFF;
335 assert(a_byte == *start++, "should be the same code");
336 }
337 #endif
338 } else {
339 // make a copy the code which is going to be patched.
340 for (int i = 0; i < _bytes_to_copy; i++) {
341 address ptr = (address)(_pc_start + i);
342 int a_byte = (*ptr) & 0xFF;
343 __ emit_int8(a_byte);
344 *ptr = 0x90; // make the site look like a nop
345 }
346 }
347
348 address end_of_patch = __ pc();
349 int bytes_to_skip = 0;
350 if (_id == load_mirror_id) {
351 int offset = __ offset();
352 if (CommentedAssembly) {
353 __ block_comment(" being_initialized check");
354 }
355 assert(_obj != noreg, "must be a valid register");
356 Register tmp = rax;
357 Register tmp2 = rbx;
358 __ push(tmp);
359 __ push(tmp2);
360 // Load without verification to keep code size small. We need it because
361 // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null.
362 __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));
363 __ get_thread(tmp);
364 __ cmpptr(tmp, Address(tmp2, InstanceKlass::init_thread_offset()));
365 __ pop(tmp2);
366 __ pop(tmp);
367 __ jcc(Assembler::notEqual, call_patch);
368
369 // access_field patches may execute the patched code before it's
370 // copied back into place so we need to jump back into the main
371 // code of the nmethod to continue execution.
372 __ jmp(_patch_site_continuation);
373
374 // make sure this extra code gets skipped
375 bytes_to_skip += __ offset() - offset;
376 }
377 if (CommentedAssembly) {
378 __ block_comment("patch data encoded as movl");
379 }
380 // Now emit the patch record telling the runtime how to find the
381 // pieces of the patch. We only need 3 bytes but for readability of
382 // the disassembly we make the data look like a movl reg, imm32,
383 // which requires 5 bytes
384 int sizeof_patch_record = 5;
385 bytes_to_skip += sizeof_patch_record;
386
387 // emit the offsets needed to find the code to patch
388 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
389
390 __ emit_int8((unsigned char)0xB8);
391 __ emit_int8(0);
392 __ emit_int8(being_initialized_entry_offset);
393 __ emit_int8(bytes_to_skip);
394 __ emit_int8(_bytes_to_copy);
395 address patch_info_pc = __ pc();
396 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
397
398 address entry = __ pc();
399 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
400 address target = NULL;
401 relocInfo::relocType reloc_type = relocInfo::none;
402 switch (_id) {
403 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
404 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
405 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
406 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
407 default: ShouldNotReachHere();
408 }
409 __ bind(call_patch);
410
411 if (CommentedAssembly) {
412 __ block_comment("patch entry point");
413 }
414 __ call(RuntimeAddress(target));
415 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
416 ce->add_call_info_here(_info);
417 int jmp_off = __ offset();
418 __ jmp(_patch_site_entry);
419 // Add enough nops so deoptimization can overwrite the jmp above with a call
420 // and not destroy the world. We cannot use fat nops here, since the concurrent
421 // code rewrite may transiently create the illegal instruction sequence.
422 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
423 __ nop();
424 }
425 if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
426 CodeSection* cs = __ code_section();
427 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
428 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, reloc_type, relocInfo::none);
429 }
430 }
431
432
433 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
434 __ bind(_entry);
435 ce->store_parameter(_trap_request, 0);
436 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));
437 ce->add_call_info_here(_info);
438 DEBUG_ONLY(__ should_not_reach_here());
439 }
440
441
442 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
443 address a;
444 if (_info->deoptimize_on_exception()) {
445 // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
446 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
447 } else {
448 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
449 }
450
451 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
452 __ bind(_entry);
453 __ call(RuntimeAddress(a));
454 ce->add_call_info_here(_info);
455 ce->verify_oop_map(_info);
456 debug_only(__ should_not_reach_here());
457 }
458
459
460 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
461 assert(__ rsp_offset() == 0, "frame size should be fixed");
462
463 __ bind(_entry);
464 // pass the object on stack because all registers must be preserved
465 if (_obj->is_cpu_register()) {
466 ce->store_parameter(_obj->as_register(), 0);
467 }
468 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
469 ce->add_call_info_here(_info);
470 debug_only(__ should_not_reach_here());
471 }
472
473
474 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
475 //---------------slow case: call to native-----------------
476 __ bind(_entry);
477 // Figure out where the args should go
478 // This should really convert the IntrinsicID to the Method* and signature
479 // but I don't know how to do that.
480 //
481 VMRegPair args[5];
482 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
483 SharedRuntime::java_calling_convention(signature, args, 5, true);
484
485 // push parameters
486 // (src, src_pos, dest, destPos, length)
487 Register r[5];
488 r[0] = src()->as_register();
489 r[1] = src_pos()->as_register();
490 r[2] = dst()->as_register();
491 r[3] = dst_pos()->as_register();
492 r[4] = length()->as_register();
493
494 // next registers will get stored on the stack
495 for (int i = 0; i < 5 ; i++ ) {
496 VMReg r_1 = args[i].first();
497 if (r_1->is_stack()) {
498 int st_off = r_1->reg2stack() * wordSize;
499 __ movptr (Address(rsp, st_off), r[i]);
500 } else {
501 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
502 }
503 }
504
505 ce->align_call(lir_static_call);
506
507 ce->emit_static_call_stub();
508 if (ce->compilation()->bailed_out()) {
509 return; // CodeCache is full
510 }
511 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
512 relocInfo::static_call_type);
513 __ call(resolve);
514 ce->add_call_info_here(info());
515
516 #ifndef PRODUCT
517 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
518 #endif
519
520 __ jmp(_continuation);
521 }
522
523 /////////////////////////////////////////////////////////////////////////////
524 #if INCLUDE_ALL_GCS
525
526 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
527 // At this point we know that marking is in progress.
528 // If do_load() is true then we have to emit the
529 // load of the previous value; otherwise it has already
530 // been loaded into _pre_val.
531
532 __ bind(_entry);
533 assert(pre_val()->is_register(), "Precondition.");
534
535 Register pre_val_reg = pre_val()->as_register();
536
537 if (do_load()) {
538 ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);
539 }
540
541 __ cmpptr(pre_val_reg, (int32_t) NULL_WORD);
542 __ jcc(Assembler::equal, _continuation);
543 ce->store_parameter(pre_val()->as_register(), 0);
544 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id)));
545 __ jmp(_continuation);
546
547 }
548
549 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
550 __ bind(_entry);
551 assert(addr()->is_register(), "Precondition.");
552 assert(new_val()->is_register(), "Precondition.");
553 Register new_val_reg = new_val()->as_register();
554 __ cmpptr(new_val_reg, (int32_t) NULL_WORD);
555 __ jcc(Assembler::equal, _continuation);
556 ce->store_parameter(addr()->as_pointer_register(), 0);
557 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id)));
558 __ jmp(_continuation);
559 }
560
561 #endif // INCLUDE_ALL_GCS
562 /////////////////////////////////////////////////////////////////////////////
563
564 #undef __