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 "runtime/sharedRuntime.hpp"
33 #include "utilities/align.hpp"
34 #include "utilities/macros.hpp"
35 #include "vmreg_x86.inline.hpp"
36
37
38 #define __ ce->masm()->
39
40 float ConversionStub::float_zero = 0.0;
41 double ConversionStub::double_zero = 0.0;
42
43 void ConversionStub::emit_code(LIR_Assembler* ce) {
44 __ bind(_entry);
45 assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
46
47
48 if (input()->is_single_xmm()) {
49 __ comiss(input()->as_xmm_float_reg(),
50 ExternalAddress((address)&float_zero));
51 } else if (input()->is_double_xmm()) {
52 __ comisd(input()->as_xmm_double_reg(),
53 ExternalAddress((address)&double_zero));
54 } else {
55 LP64_ONLY(ShouldNotReachHere());
56 __ push(rax);
57 __ ftst();
58 __ fnstsw_ax();
59 __ sahf();
60 __ pop(rax);
61 }
62
63 Label NaN, do_return;
64 __ jccb(Assembler::parity, NaN);
65 __ jccb(Assembler::below, do_return);
66
67 // input is > 0 -> return maxInt
68 // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
69 __ decrement(result()->as_register());
70 __ jmpb(do_return);
71
72 // input is NaN -> return 0
73 __ bind(NaN);
74 __ xorptr(result()->as_register(), result()->as_register());
75
76 __ bind(do_return);
77 __ jmp(_continuation);
78 }
79
80 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
81 __ bind(_entry);
82 Metadata *m = _method->as_constant_ptr()->as_metadata();
83 ce->store_parameter(m, 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 if (_info->deoptimize_on_exception()) {
104 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
105 __ call(RuntimeAddress(a));
106 ce->add_call_info_here(_info);
107 ce->verify_oop_map(_info);
108 debug_only(__ should_not_reach_here());
109 return;
110 }
111
112 // pass the array index on stack because all registers must be preserved
113 if (_index->is_cpu_register()) {
114 ce->store_parameter(_index->as_register(), 0);
115 } else {
116 ce->store_parameter(_index->as_jint(), 0);
117 }
118 Runtime1::StubID stub_id;
119 if (_throw_index_out_of_bounds_exception) {
120 stub_id = Runtime1::throw_index_exception_id;
121 } else {
122 stub_id = Runtime1::throw_range_check_failed_id;
123 }
124 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
125 ce->add_call_info_here(_info);
126 ce->verify_oop_map(_info);
127 debug_only(__ should_not_reach_here());
128 }
129
130 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
131 _info = new CodeEmitInfo(info);
132 }
133
134 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
135 __ bind(_entry);
136 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
137 __ call(RuntimeAddress(a));
138 ce->add_call_info_here(_info);
139 ce->verify_oop_map(_info);
140 debug_only(__ should_not_reach_here());
141 }
142
143 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
144 if (_offset != -1) {
145 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
146 }
147 __ bind(_entry);
148 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
149 ce->add_call_info_here(_info);
150 debug_only(__ should_not_reach_here());
151 }
152
153
154 // Implementation of NewInstanceStub
155
156 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
157 _result = result;
158 _klass = klass;
159 _klass_reg = klass_reg;
160 _info = new CodeEmitInfo(info);
161 assert(stub_id == Runtime1::new_instance_id ||
162 stub_id == Runtime1::fast_new_instance_id ||
163 stub_id == Runtime1::fast_new_instance_init_check_id,
164 "need new_instance id");
165 _stub_id = stub_id;
166 }
167
168
169 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
170 assert(__ rsp_offset() == 0, "frame size should be fixed");
171 __ bind(_entry);
172 __ movptr(rdx, _klass_reg->as_register());
173 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
174 ce->add_call_info_here(_info);
175 ce->verify_oop_map(_info);
176 assert(_result->as_register() == rax, "result must in rax,");
177 __ jmp(_continuation);
178 }
179
180
181 // Implementation of NewTypeArrayStub
182
183 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
184 _klass_reg = klass_reg;
185 _length = length;
186 _result = result;
187 _info = new CodeEmitInfo(info);
188 }
189
190
191 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
192 assert(__ rsp_offset() == 0, "frame size should be fixed");
193 __ bind(_entry);
194 assert(_length->as_register() == rbx, "length must in rbx,");
195 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
196 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
197 ce->add_call_info_here(_info);
198 ce->verify_oop_map(_info);
199 assert(_result->as_register() == rax, "result must in rax,");
200 __ jmp(_continuation);
201 }
202
203
204 // Implementation of NewObjectArrayStub
205
206 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
207 _klass_reg = klass_reg;
208 _result = result;
209 _length = length;
210 _info = new CodeEmitInfo(info);
211 }
212
213
214 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
215 assert(__ rsp_offset() == 0, "frame size should be fixed");
216 __ bind(_entry);
217 assert(_length->as_register() == rbx, "length must in rbx,");
218 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
219 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
220 ce->add_call_info_here(_info);
221 ce->verify_oop_map(_info);
222 assert(_result->as_register() == rax, "result must in rax,");
223 __ jmp(_continuation);
224 }
225
226
227 // Implementation of MonitorAccessStubs
228
229 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
230 : MonitorAccessStub(obj_reg, lock_reg)
231 {
232 _info = new CodeEmitInfo(info);
233 }
234
235
236 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
237 assert(__ rsp_offset() == 0, "frame size should be fixed");
238 __ bind(_entry);
239 ce->store_parameter(_obj_reg->as_register(), 1);
240 ce->store_parameter(_lock_reg->as_register(), 0);
241 Runtime1::StubID enter_id;
242 if (ce->compilation()->has_fpu_code()) {
243 enter_id = Runtime1::monitorenter_id;
244 } else {
245 enter_id = Runtime1::monitorenter_nofpu_id;
246 }
247 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
248 ce->add_call_info_here(_info);
249 ce->verify_oop_map(_info);
250 __ jmp(_continuation);
251 }
252
253
254 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
255 __ bind(_entry);
256 if (_compute_lock) {
257 // lock_reg was destroyed by fast unlocking attempt => recompute it
258 ce->monitor_address(_monitor_ix, _lock_reg);
259 }
260 ce->store_parameter(_lock_reg->as_register(), 0);
261 // note: non-blocking leaf routine => no call info needed
262 Runtime1::StubID exit_id;
263 if (ce->compilation()->has_fpu_code()) {
264 exit_id = Runtime1::monitorexit_id;
265 } else {
266 exit_id = Runtime1::monitorexit_nofpu_id;
267 }
268 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
269 __ jmp(_continuation);
270 }
271
272
273 // Implementation of patching:
274 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
275 // - Replace original code with a call to the stub
276 // At Runtime:
277 // - call to stub, jump to runtime
278 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
279 // - in runtime: after initializing class, restore original code, reexecute instruction
280
281 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
282
283 void PatchingStub::align_patch_site(MacroAssembler* masm) {
284 // We're patching a 5-7 byte instruction on intel and we need to
285 // make sure that we don't see a piece of the instruction. It
286 // appears mostly impossible on Intel to simply invalidate other
287 // processors caches and since they may do aggressive prefetch it's
288 // very hard to make a guess about what code might be in the icache.
289 // Force the instruction to be double word aligned so that it
290 // doesn't span a cache line.
291 masm->align(align_up((int)NativeGeneralJump::instruction_size, wordSize));
292 }
293
294 void PatchingStub::emit_code(LIR_Assembler* ce) {
295 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
296
297 Label call_patch;
298
299 // static field accesses have special semantics while the class
300 // initializer is being run so we emit a test which can be used to
301 // check that this code is being executed by the initializing
302 // thread.
303 address being_initialized_entry = __ pc();
304 if (CommentedAssembly) {
305 __ block_comment(" patch template");
306 }
307 if (_id == load_klass_id) {
308 // produce a copy of the load klass instruction for use by the being initialized case
309 #ifdef ASSERT
310 address start = __ pc();
311 #endif
312 Metadata* o = NULL;
313 __ mov_metadata(_obj, o);
314 #ifdef ASSERT
315 for (int i = 0; i < _bytes_to_copy; i++) {
316 address ptr = (address)(_pc_start + i);
317 int a_byte = (*ptr) & 0xFF;
318 assert(a_byte == *start++, "should be the same code");
319 }
320 #endif
321 } else if (_id == load_mirror_id) {
322 // produce a copy of the load mirror instruction for use by the being
323 // initialized case
324 #ifdef ASSERT
325 address start = __ pc();
326 #endif
327 jobject o = NULL;
328 __ movoop(_obj, o);
329 #ifdef ASSERT
330 for (int i = 0; i < _bytes_to_copy; i++) {
331 address ptr = (address)(_pc_start + i);
332 int a_byte = (*ptr) & 0xFF;
333 assert(a_byte == *start++, "should be the same code");
334 }
335 #endif
336 } else {
337 // make a copy the code which is going to be patched.
338 for (int i = 0; i < _bytes_to_copy; i++) {
339 address ptr = (address)(_pc_start + i);
340 int a_byte = (*ptr) & 0xFF;
341 __ emit_int8(a_byte);
342 *ptr = 0x90; // make the site look like a nop
343 }
344 }
345
346 address end_of_patch = __ pc();
347 int bytes_to_skip = 0;
348 if (_id == load_mirror_id) {
349 int offset = __ offset();
350 if (CommentedAssembly) {
351 __ block_comment(" being_initialized check");
352 }
353 assert(_obj != noreg, "must be a valid register");
354 Register tmp = rax;
355 Register tmp2 = rbx;
356 __ push(tmp);
357 __ push(tmp2);
358 // Load without verification to keep code size small. We need it because
359 // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null.
360 __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));
361 __ get_thread(tmp);
362 __ cmpptr(tmp, Address(tmp2, InstanceKlass::init_thread_offset()));
363 __ pop(tmp2);
364 __ pop(tmp);
365 __ jcc(Assembler::notEqual, call_patch);
366
367 // access_field patches may execute the patched code before it's
368 // copied back into place so we need to jump back into the main
369 // code of the nmethod to continue execution.
370 __ jmp(_patch_site_continuation);
371
372 // make sure this extra code gets skipped
373 bytes_to_skip += __ offset() - offset;
374 }
375 if (CommentedAssembly) {
376 __ block_comment("patch data encoded as movl");
377 }
378 // Now emit the patch record telling the runtime how to find the
379 // pieces of the patch. We only need 3 bytes but for readability of
380 // the disassembly we make the data look like a movl reg, imm32,
381 // which requires 5 bytes
382 int sizeof_patch_record = 5;
383 bytes_to_skip += sizeof_patch_record;
384
385 // emit the offsets needed to find the code to patch
386 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
387
388 __ emit_int8((unsigned char)0xB8);
389 __ emit_int8(0);
390 __ emit_int8(being_initialized_entry_offset);
391 __ emit_int8(bytes_to_skip);
392 __ emit_int8(_bytes_to_copy);
393 address patch_info_pc = __ pc();
394 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
395
396 address entry = __ pc();
397 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
398 address target = NULL;
399 relocInfo::relocType reloc_type = relocInfo::none;
400 switch (_id) {
401 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
402 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
403 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
404 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
405 default: ShouldNotReachHere();
406 }
407 __ bind(call_patch);
408
409 if (CommentedAssembly) {
410 __ block_comment("patch entry point");
411 }
412 __ call(RuntimeAddress(target));
413 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
414 ce->add_call_info_here(_info);
415 int jmp_off = __ offset();
416 __ jmp(_patch_site_entry);
417 // Add enough nops so deoptimization can overwrite the jmp above with a call
418 // and not destroy the world. We cannot use fat nops here, since the concurrent
419 // code rewrite may transiently create the illegal instruction sequence.
420 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
421 __ nop();
422 }
423 if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
424 CodeSection* cs = __ code_section();
425 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
426 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, reloc_type, relocInfo::none);
427 }
428 }
429
430
431 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
432 __ bind(_entry);
433 ce->store_parameter(_trap_request, 0);
434 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));
435 ce->add_call_info_here(_info);
436 DEBUG_ONLY(__ should_not_reach_here());
437 }
438
439
440 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
441 address a;
442 if (_info->deoptimize_on_exception()) {
443 // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
444 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
445 } else {
446 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
447 }
448
449 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
450 __ bind(_entry);
451 __ call(RuntimeAddress(a));
452 ce->add_call_info_here(_info);
453 ce->verify_oop_map(_info);
454 debug_only(__ should_not_reach_here());
455 }
456
457
458 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
459 assert(__ rsp_offset() == 0, "frame size should be fixed");
460
461 __ bind(_entry);
462 // pass the object on stack because all registers must be preserved
463 if (_obj->is_cpu_register()) {
464 ce->store_parameter(_obj->as_register(), 0);
465 }
466 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
467 ce->add_call_info_here(_info);
468 debug_only(__ should_not_reach_here());
469 }
470
471
472 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
473 //---------------slow case: call to native-----------------
474 __ bind(_entry);
475 // Figure out where the args should go
476 // This should really convert the IntrinsicID to the Method* and signature
477 // but I don't know how to do that.
478 //
479 VMRegPair args[5];
480 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
481 SharedRuntime::java_calling_convention(signature, args, 5, true);
482
483 // push parameters
484 // (src, src_pos, dest, destPos, length)
485 Register r[5];
486 r[0] = src()->as_register();
487 r[1] = src_pos()->as_register();
488 r[2] = dst()->as_register();
489 r[3] = dst_pos()->as_register();
490 r[4] = length()->as_register();
491
492 // next registers will get stored on the stack
493 for (int i = 0; i < 5 ; i++ ) {
494 VMReg r_1 = args[i].first();
495 if (r_1->is_stack()) {
496 int st_off = r_1->reg2stack() * wordSize;
497 __ movptr (Address(rsp, st_off), r[i]);
498 } else {
499 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
500 }
501 }
502
503 ce->align_call(lir_static_call);
504
505 ce->emit_static_call_stub();
506 if (ce->compilation()->bailed_out()) {
507 return; // CodeCache is full
508 }
509 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
510 relocInfo::static_call_type);
511 __ call(resolve);
512 ce->add_call_info_here(info());
513
514 #ifndef PRODUCT
515 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
516 #endif
517
518 __ jmp(_continuation);
519 }
520
521 #undef __