1 /*
2 * Copyright (c) 1999, 2011, 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 "vmreg_x86.inline.hpp"
34 #ifndef SERIALGC
35 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
36 #endif
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 ce->store_parameter(_method->as_register(), 1);
84 ce->store_parameter(_bci, 0);
85 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
86 ce->add_call_info_here(_info);
87 ce->verify_oop_map(_info);
88 __ jmp(_continuation);
89 }
90
91 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
92 bool throw_index_out_of_bounds_exception)
93 : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
94 , _index(index)
95 {
96 assert(info != NULL, "must have info");
97 _info = new CodeEmitInfo(info);
98 }
99
100
101 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
102 __ bind(_entry);
103 // pass the array index on stack because all registers must be preserved
104 if (_index->is_cpu_register()) {
105 ce->store_parameter(_index->as_register(), 0);
106 } else {
107 ce->store_parameter(_index->as_jint(), 0);
108 }
109 Runtime1::StubID stub_id;
110 if (_throw_index_out_of_bounds_exception) {
111 stub_id = Runtime1::throw_index_exception_id;
112 } else {
113 stub_id = Runtime1::throw_range_check_failed_id;
114 }
115 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
116 ce->add_call_info_here(_info);
117 debug_only(__ should_not_reach_here());
118 }
119
120
121 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
122 if (_offset != -1) {
123 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
124 }
125 __ bind(_entry);
126 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
127 ce->add_call_info_here(_info);
128 debug_only(__ should_not_reach_here());
129 }
130
131
132 // Implementation of NewInstanceStub
133
134 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
135 _result = result;
136 _klass = klass;
137 _klass_reg = klass_reg;
138 _info = new CodeEmitInfo(info);
139 assert(stub_id == Runtime1::new_instance_id ||
140 stub_id == Runtime1::fast_new_instance_id ||
141 stub_id == Runtime1::fast_new_instance_init_check_id,
142 "need new_instance id");
143 _stub_id = stub_id;
144 }
145
146
147 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
148 assert(__ rsp_offset() == 0, "frame size should be fixed");
149 __ bind(_entry);
150 __ movptr(rdx, _klass_reg->as_register());
151 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
152 ce->add_call_info_here(_info);
153 ce->verify_oop_map(_info);
154 assert(_result->as_register() == rax, "result must in rax,");
155 __ jmp(_continuation);
156 }
157
158
159 // Implementation of NewTypeArrayStub
160
161 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
162 _klass_reg = klass_reg;
163 _length = length;
164 _result = result;
165 _info = new CodeEmitInfo(info);
166 }
167
168
169 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
170 assert(__ rsp_offset() == 0, "frame size should be fixed");
171 __ bind(_entry);
172 assert(_length->as_register() == rbx, "length must in rbx,");
173 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
174 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
175 ce->add_call_info_here(_info);
176 ce->verify_oop_map(_info);
177 assert(_result->as_register() == rax, "result must in rax,");
178 __ jmp(_continuation);
179 }
180
181
182 // Implementation of NewObjectArrayStub
183
184 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
185 _klass_reg = klass_reg;
186 _result = result;
187 _length = length;
188 _info = new CodeEmitInfo(info);
189 }
190
191
192 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
193 assert(__ rsp_offset() == 0, "frame size should be fixed");
194 __ bind(_entry);
195 assert(_length->as_register() == rbx, "length must in rbx,");
196 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
197 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
198 ce->add_call_info_here(_info);
199 ce->verify_oop_map(_info);
200 assert(_result->as_register() == rax, "result must in rax,");
201 __ jmp(_continuation);
202 }
203
204
205 // Implementation of MonitorAccessStubs
206
207 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
208 : MonitorAccessStub(obj_reg, lock_reg)
209 {
210 _info = new CodeEmitInfo(info);
211 }
212
213
214 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
215 assert(__ rsp_offset() == 0, "frame size should be fixed");
216 __ bind(_entry);
217 ce->store_parameter(_obj_reg->as_register(), 1);
218 ce->store_parameter(_lock_reg->as_register(), 0);
219 Runtime1::StubID enter_id;
220 if (ce->compilation()->has_fpu_code()) {
221 enter_id = Runtime1::monitorenter_id;
222 } else {
223 enter_id = Runtime1::monitorenter_nofpu_id;
224 }
225 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
226 ce->add_call_info_here(_info);
227 ce->verify_oop_map(_info);
228 __ jmp(_continuation);
229 }
230
231
232 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
233 __ bind(_entry);
234 if (_compute_lock) {
235 // lock_reg was destroyed by fast unlocking attempt => recompute it
236 ce->monitor_address(_monitor_ix, _lock_reg);
237 }
238 ce->store_parameter(_lock_reg->as_register(), 0);
239 // note: non-blocking leaf routine => no call info needed
240 Runtime1::StubID exit_id;
241 if (ce->compilation()->has_fpu_code()) {
242 exit_id = Runtime1::monitorexit_id;
243 } else {
244 exit_id = Runtime1::monitorexit_nofpu_id;
245 }
246 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
247 __ jmp(_continuation);
248 }
249
250
251 // Implementation of patching:
252 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
253 // - Replace original code with a call to the stub
254 // At Runtime:
255 // - call to stub, jump to runtime
256 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
257 // - in runtime: after initializing class, restore original code, reexecute instruction
258
259 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
260
261 void PatchingStub::align_patch_site(MacroAssembler* masm) {
262 // We're patching a 5-7 byte instruction on intel and we need to
263 // make sure that we don't see a piece of the instruction. It
264 // appears mostly impossible on Intel to simply invalidate other
265 // processors caches and since they may do aggressive prefetch it's
266 // very hard to make a guess about what code might be in the icache.
267 // Force the instruction to be double word aligned so that it
268 // doesn't span a cache line.
269 masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
270 }
271
272 void PatchingStub::emit_code(LIR_Assembler* ce) {
273 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
274
275 Label call_patch;
276
277 // static field accesses have special semantics while the class
278 // initializer is being run so we emit a test which can be used to
279 // check that this code is being executed by the initializing
280 // thread.
281 address being_initialized_entry = __ pc();
282 if (CommentedAssembly) {
283 __ block_comment(" patch template");
284 }
285 if (_id == load_klass_id) {
286 // produce a copy of the load klass instruction for use by the being initialized case
287 address start = __ pc();
288 jobject o = NULL;
289 __ movoop(_obj, o);
290 #ifdef ASSERT
291 for (int i = 0; i < _bytes_to_copy; i++) {
292 address ptr = (address)(_pc_start + i);
293 int a_byte = (*ptr) & 0xFF;
294 assert(a_byte == *start++, "should be the same code");
295 }
296 #endif
297 } else {
298 // make a copy the code which is going to be patched.
299 for ( int i = 0; i < _bytes_to_copy; i++) {
300 address ptr = (address)(_pc_start + i);
301 int a_byte = (*ptr) & 0xFF;
302 __ a_byte (a_byte);
303 *ptr = 0x90; // make the site look like a nop
304 }
305 }
306
307 address end_of_patch = __ pc();
308 int bytes_to_skip = 0;
309 if (_id == load_klass_id) {
310 int offset = __ offset();
311 if (CommentedAssembly) {
312 __ block_comment(" being_initialized check");
313 }
314 assert(_obj != noreg, "must be a valid register");
315 Register tmp = rax;
316 Register tmp2 = rbx;
317 __ push(tmp);
318 __ push(tmp2);
319 // Load without verification to keep code size small. We need it because
320 // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null.
321 __ load_heap_oop_not_null(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));
322 __ get_thread(tmp);
323 __ cmpptr(tmp, Address(tmp2, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc)));
324 __ pop(tmp2);
325 __ pop(tmp);
326 __ jcc(Assembler::notEqual, call_patch);
327
328 // access_field patches may execute the patched code before it's
329 // copied back into place so we need to jump back into the main
330 // code of the nmethod to continue execution.
331 __ jmp(_patch_site_continuation);
332
333 // make sure this extra code gets skipped
334 bytes_to_skip += __ offset() - offset;
335 }
336 if (CommentedAssembly) {
337 __ block_comment("patch data encoded as movl");
338 }
339 // Now emit the patch record telling the runtime how to find the
340 // pieces of the patch. We only need 3 bytes but for readability of
341 // the disassembly we make the data look like a movl reg, imm32,
342 // which requires 5 bytes
343 int sizeof_patch_record = 5;
344 bytes_to_skip += sizeof_patch_record;
345
346 // emit the offsets needed to find the code to patch
347 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
348
349 __ a_byte(0xB8);
350 __ a_byte(0);
351 __ a_byte(being_initialized_entry_offset);
352 __ a_byte(bytes_to_skip);
353 __ a_byte(_bytes_to_copy);
354 address patch_info_pc = __ pc();
355 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
356
357 address entry = __ pc();
358 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
359 address target = NULL;
360 switch (_id) {
361 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
362 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); break;
363 default: ShouldNotReachHere();
364 }
365 __ bind(call_patch);
366
367 if (CommentedAssembly) {
368 __ block_comment("patch entry point");
369 }
370 __ call(RuntimeAddress(target));
371 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
372 ce->add_call_info_here(_info);
373 int jmp_off = __ offset();
374 __ jmp(_patch_site_entry);
375 // Add enough nops so deoptimization can overwrite the jmp above with a call
376 // and not destroy the world.
377 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
378 __ nop();
379 }
380 if (_id == load_klass_id) {
381 CodeSection* cs = __ code_section();
382 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
383 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none);
384 }
385 }
386
387
388 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
389 __ bind(_entry);
390 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));
391 ce->add_call_info_here(_info);
392 DEBUG_ONLY(__ should_not_reach_here());
393 }
394
395
396 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
397 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
398 __ bind(_entry);
399 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id)));
400 ce->add_call_info_here(_info);
401 debug_only(__ should_not_reach_here());
402 }
403
404 void InvalidateProfileInliningStub::emit_code(LIR_Assembler* ce) {
405 __ bind(_entry);
406
407 ce->store_parameter(_obj->as_register(), 0);
408 assert(_klass->is_loaded(), "class should be loaded");
409 ce->store_parameter(_klass->constant_encoding(), 1);
410
411 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::invalidate_profile_inlining_id)));
412 ce->add_call_info_here(_info);
413 debug_only(__ should_not_reach_here());
414 }
415
416 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
417 assert(__ rsp_offset() == 0, "frame size should be fixed");
418
419 __ bind(_entry);
420 // pass the object on stack because all registers must be preserved
421 if (_obj->is_cpu_register()) {
422 ce->store_parameter(_obj->as_register(), 0);
423 }
424 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
425 ce->add_call_info_here(_info);
426 debug_only(__ should_not_reach_here());
427 }
428
429
430 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
431 //---------------slow case: call to native-----------------
432 __ bind(_entry);
433 // Figure out where the args should go
434 // This should really convert the IntrinsicID to the methodOop and signature
435 // but I don't know how to do that.
436 //
437 VMRegPair args[5];
438 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
439 SharedRuntime::java_calling_convention(signature, args, 5, true);
440
441 // push parameters
442 // (src, src_pos, dest, destPos, length)
443 Register r[5];
444 r[0] = src()->as_register();
445 r[1] = src_pos()->as_register();
446 r[2] = dst()->as_register();
447 r[3] = dst_pos()->as_register();
448 r[4] = length()->as_register();
449
450 // next registers will get stored on the stack
451 for (int i = 0; i < 5 ; i++ ) {
452 VMReg r_1 = args[i].first();
453 if (r_1->is_stack()) {
454 int st_off = r_1->reg2stack() * wordSize;
455 __ movptr (Address(rsp, st_off), r[i]);
456 } else {
457 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
458 }
459 }
460
461 ce->align_call(lir_static_call);
462
463 ce->emit_static_call_stub();
464 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
465 relocInfo::static_call_type);
466 __ call(resolve);
467 ce->add_call_info_here(info());
468
469 #ifndef PRODUCT
470 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
471 #endif
472
473 __ jmp(_continuation);
474 }
475
476 /////////////////////////////////////////////////////////////////////////////
477 #ifndef SERIALGC
478
479 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
480 // At this point we know that marking is in progress.
481 // If do_load() is true then we have to emit the
482 // load of the previous value; otherwise it has already
483 // been loaded into _pre_val.
484
485 __ bind(_entry);
486 assert(pre_val()->is_register(), "Precondition.");
487
488 Register pre_val_reg = pre_val()->as_register();
489
490 if (do_load()) {
491 ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);
492 }
493
494 __ cmpptr(pre_val_reg, (int32_t) NULL_WORD);
495 __ jcc(Assembler::equal, _continuation);
496 ce->store_parameter(pre_val()->as_register(), 0);
497 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id)));
498 __ jmp(_continuation);
499
500 }
501
502 void G1UnsafeGetObjSATBBarrierStub::emit_code(LIR_Assembler* ce) {
503 // At this point we know that offset == referent_offset.
504 //
505 // So we might have to emit:
506 // if (src == null) goto continuation.
507 //
508 // and we definitely have to emit:
509 // if (klass(src).reference_type == REF_NONE) goto continuation
510 // if (!marking_active) goto continuation
511 // if (pre_val == null) goto continuation
512 // call pre_barrier(pre_val)
513 // goto continuation
514 //
515 __ bind(_entry);
516
517 assert(src()->is_register(), "sanity");
518 Register src_reg = src()->as_register();
519
520 if (gen_src_check()) {
521 // The original src operand was not a constant.
522 // Generate src == null?
523 __ cmpptr(src_reg, (int32_t) NULL_WORD);
524 __ jcc(Assembler::equal, _continuation);
525 }
526
527 // Generate src->_klass->_reference_type == REF_NONE)?
528 assert(tmp()->is_register(), "sanity");
529 Register tmp_reg = tmp()->as_register();
530
531 __ load_klass(tmp_reg, src_reg);
532
533 Address ref_type_adr(tmp_reg, instanceKlass::reference_type_offset_in_bytes() + sizeof(oopDesc));
534 __ cmpl(ref_type_adr, REF_NONE);
535 __ jcc(Assembler::equal, _continuation);
536
537 // Is marking active?
538 assert(thread()->is_register(), "precondition");
539 Register thread_reg = thread()->as_pointer_register();
540
541 Address in_progress(thread_reg, in_bytes(JavaThread::satb_mark_queue_offset() +
542 PtrQueue::byte_offset_of_active()));
543
544 if (in_bytes(PtrQueue::byte_width_of_active()) == 4) {
545 __ cmpl(in_progress, 0);
546 } else {
547 assert(in_bytes(PtrQueue::byte_width_of_active()) == 1, "Assumption");
548 __ cmpb(in_progress, 0);
549 }
550 __ jcc(Assembler::equal, _continuation);
551
552 // val == null?
553 assert(val()->is_register(), "Precondition.");
554 Register val_reg = val()->as_register();
555
556 __ cmpptr(val_reg, (int32_t) NULL_WORD);
557 __ jcc(Assembler::equal, _continuation);
558
559 ce->store_parameter(val()->as_register(), 0);
560 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id)));
561 __ jmp(_continuation);
562 }
563
564 jbyte* G1PostBarrierStub::_byte_map_base = NULL;
565
566 jbyte* G1PostBarrierStub::byte_map_base_slow() {
567 BarrierSet* bs = Universe::heap()->barrier_set();
568 assert(bs->is_a(BarrierSet::G1SATBCTLogging),
569 "Must be if we're using this.");
570 return ((G1SATBCardTableModRefBS*)bs)->byte_map_base;
571 }
572
573 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
574 __ bind(_entry);
575 assert(addr()->is_register(), "Precondition.");
576 assert(new_val()->is_register(), "Precondition.");
577 Register new_val_reg = new_val()->as_register();
578 __ cmpptr(new_val_reg, (int32_t) NULL_WORD);
579 __ jcc(Assembler::equal, _continuation);
580 ce->store_parameter(addr()->as_pointer_register(), 0);
581 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id)));
582 __ jmp(_continuation);
583 }
584
585 #endif // SERIALGC
586 /////////////////////////////////////////////////////////////////////////////
587
588 #undef __