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
36 #define __ ce->masm()->
37
38 float ConversionStub::float_zero = 0.0;
39 double ConversionStub::double_zero = 0.0;
40
41 void ConversionStub::emit_code(LIR_Assembler* ce) {
42 __ bind(_entry);
43 assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
44
45
46 if (input()->is_single_xmm()) {
47 __ comiss(input()->as_xmm_float_reg(),
48 ExternalAddress((address)&float_zero));
49 } else if (input()->is_double_xmm()) {
50 __ comisd(input()->as_xmm_double_reg(),
51 ExternalAddress((address)&double_zero));
52 } else {
53 LP64_ONLY(ShouldNotReachHere());
54 __ push(rax);
55 __ ftst();
56 __ fnstsw_ax();
57 __ sahf();
58 __ pop(rax);
59 }
60
61 Label NaN, do_return;
62 __ jccb(Assembler::parity, NaN);
63 __ jccb(Assembler::below, do_return);
64
65 // input is > 0 -> return maxInt
66 // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
67 __ decrement(result()->as_register());
68 __ jmpb(do_return);
69
70 // input is NaN -> return 0
71 __ bind(NaN);
72 __ xorptr(result()->as_register(), result()->as_register());
73
74 __ bind(do_return);
75 __ jmp(_continuation);
76 }
77
78 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
79 __ bind(_entry);
80 Metadata *m = _method->as_constant_ptr()->as_metadata();
81 ce->store_parameter(m, 1);
82 ce->store_parameter(_bci, 0);
83 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
84 ce->add_call_info_here(_info);
85 ce->verify_oop_map(_info);
86 __ jmp(_continuation);
87 }
88
89 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
90 bool throw_index_out_of_bounds_exception)
91 : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
92 , _index(index)
93 {
94 assert(info != NULL, "must have info");
95 _info = new CodeEmitInfo(info);
96 }
97
98
99 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
100 __ bind(_entry);
101 if (_info->deoptimize_on_exception()) {
102 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
103 __ call(RuntimeAddress(a));
104 ce->add_call_info_here(_info);
105 ce->verify_oop_map(_info);
106 debug_only(__ should_not_reach_here());
107 return;
108 }
109
110 // pass the array index on stack because all registers must be preserved
111 if (_index->is_cpu_register()) {
112 ce->store_parameter(_index->as_register(), 0);
113 } else {
114 ce->store_parameter(_index->as_jint(), 0);
115 }
116 Runtime1::StubID stub_id;
117 if (_throw_index_out_of_bounds_exception) {
118 stub_id = Runtime1::throw_index_exception_id;
119 } else {
120 stub_id = Runtime1::throw_range_check_failed_id;
121 }
122 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
123 ce->add_call_info_here(_info);
124 ce->verify_oop_map(_info);
125 debug_only(__ should_not_reach_here());
126 }
127
128 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
129 _info = new CodeEmitInfo(info);
130 }
131
132 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
133 __ bind(_entry);
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 }
140
141 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
142 if (_offset != -1) {
143 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
144 }
145 __ bind(_entry);
146 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
147 ce->add_call_info_here(_info);
148 debug_only(__ should_not_reach_here());
149 }
150
151
152 // Implementation of NewInstanceStub
153
154 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
155 _result = result;
156 _klass = klass;
157 _klass_reg = klass_reg;
158 _info = new CodeEmitInfo(info);
159 assert(stub_id == Runtime1::new_instance_id ||
160 stub_id == Runtime1::fast_new_instance_id ||
161 stub_id == Runtime1::fast_new_instance_init_check_id,
162 "need new_instance id");
163 _stub_id = stub_id;
164 }
165
166
167 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
168 assert(__ rsp_offset() == 0, "frame size should be fixed");
169 __ bind(_entry);
170 __ movptr(rdx, _klass_reg->as_register());
171 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
172 ce->add_call_info_here(_info);
173 ce->verify_oop_map(_info);
174 assert(_result->as_register() == rax, "result must in rax,");
175 __ jmp(_continuation);
176 }
177
178
179 // Implementation of NewTypeArrayStub
180
181 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
182 _klass_reg = klass_reg;
183 _length = length;
184 _result = result;
185 _info = new CodeEmitInfo(info);
186 }
187
188
189 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
190 assert(__ rsp_offset() == 0, "frame size should be fixed");
191 __ bind(_entry);
192 assert(_length->as_register() == rbx, "length must in rbx,");
193 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
194 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
195 ce->add_call_info_here(_info);
196 ce->verify_oop_map(_info);
197 assert(_result->as_register() == rax, "result must in rax,");
198 __ jmp(_continuation);
199 }
200
201
202 // Implementation of NewObjectArrayStub
203
204 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
205 _klass_reg = klass_reg;
206 _result = result;
207 _length = length;
208 _info = new CodeEmitInfo(info);
209 }
210
211
212 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
213 assert(__ rsp_offset() == 0, "frame size should be fixed");
214 __ bind(_entry);
215 assert(_length->as_register() == rbx, "length must in rbx,");
216 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
217 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
218 ce->add_call_info_here(_info);
219 ce->verify_oop_map(_info);
220 assert(_result->as_register() == rax, "result must in rax,");
221 __ jmp(_continuation);
222 }
223
224
225 // Implementation of MonitorAccessStubs
226
227 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
228 : MonitorAccessStub(obj_reg, lock_reg)
229 {
230 _info = new CodeEmitInfo(info);
231 }
232
233
234 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
235 assert(__ rsp_offset() == 0, "frame size should be fixed");
236 __ bind(_entry);
237 ce->store_parameter(_obj_reg->as_register(), 1);
238 ce->store_parameter(_lock_reg->as_register(), 0);
239 Runtime1::StubID enter_id;
240 if (ce->compilation()->has_fpu_code()) {
241 enter_id = Runtime1::monitorenter_id;
242 } else {
243 enter_id = Runtime1::monitorenter_nofpu_id;
244 }
245 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
246 ce->add_call_info_here(_info);
247 ce->verify_oop_map(_info);
248 __ jmp(_continuation);
249 }
250
251
252 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
253 __ bind(_entry);
254 if (_compute_lock) {
255 // lock_reg was destroyed by fast unlocking attempt => recompute it
256 ce->monitor_address(_monitor_ix, _lock_reg);
257 }
258 ce->store_parameter(_lock_reg->as_register(), 0);
259 // note: non-blocking leaf routine => no call info needed
260 Runtime1::StubID exit_id;
261 if (ce->compilation()->has_fpu_code()) {
262 exit_id = Runtime1::monitorexit_id;
263 } else {
264 exit_id = Runtime1::monitorexit_nofpu_id;
265 }
266 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
267 __ jmp(_continuation);
268 }
269
270
271 // Implementation of patching:
272 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
273 // - Replace original code with a call to the stub
274 // At Runtime:
275 // - call to stub, jump to runtime
276 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
277 // - in runtime: after initializing class, restore original code, reexecute instruction
278
279 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
280
281 void PatchingStub::align_patch_site(MacroAssembler* masm) {
282 // We're patching a 5-7 byte instruction on intel and we need to
283 // make sure that we don't see a piece of the instruction. It
284 // appears mostly impossible on Intel to simply invalidate other
285 // processors caches and since they may do aggressive prefetch it's
286 // very hard to make a guess about what code might be in the icache.
287 // Force the instruction to be double word aligned so that it
288 // doesn't span a cache line.
289 masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
290 }
291
292 void PatchingStub::emit_code(LIR_Assembler* ce) {
293 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
294
295 Label call_patch;
296
297 // static field accesses have special semantics while the class
298 // initializer is being run so we emit a test which can be used to
299 // check that this code is being executed by the initializing
300 // thread.
301 address being_initialized_entry = __ pc();
302 if (CommentedAssembly) {
303 __ block_comment(" patch template");
304 }
305 if (_id == load_klass_id) {
306 // produce a copy of the load klass instruction for use by the being initialized case
307 #ifdef ASSERT
308 address start = __ pc();
309 #endif
310 Metadata* o = NULL;
311 __ mov_metadata(_obj, o);
312 #ifdef ASSERT
313 for (int i = 0; i < _bytes_to_copy; i++) {
314 address ptr = (address)(_pc_start + i);
315 int a_byte = (*ptr) & 0xFF;
316 assert(a_byte == *start++, "should be the same code");
317 }
318 #endif
319 } else if (_id == load_mirror_id) {
320 // produce a copy of the load mirror instruction for use by the being
321 // initialized case
322 #ifdef ASSERT
323 address start = __ pc();
324 #endif
325 jobject o = NULL;
326 __ movoop(_obj, o);
327 #ifdef ASSERT
328 for (int i = 0; i < _bytes_to_copy; i++) {
329 address ptr = (address)(_pc_start + i);
330 int a_byte = (*ptr) & 0xFF;
331 assert(a_byte == *start++, "should be the same code");
332 }
333 #endif
334 } else {
335 // make a copy the code which is going to be patched.
336 for (int i = 0; i < _bytes_to_copy; i++) {
337 address ptr = (address)(_pc_start + i);
338 int a_byte = (*ptr) & 0xFF;
339 __ emit_int8(a_byte);
340 *ptr = 0x90; // make the site look like a nop
341 }
342 }
343
344 address end_of_patch = __ pc();
345 int bytes_to_skip = 0;
346 if (_id == load_mirror_id) {
347 int offset = __ offset();
348 if (CommentedAssembly) {
349 __ block_comment(" being_initialized check");
350 }
351 assert(_obj != noreg, "must be a valid register");
352 Register tmp = rax;
353 Register tmp2 = rbx;
354 __ push(tmp);
355 __ push(tmp2);
356 // Load without verification to keep code size small. We need it because
357 // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null.
358 __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));
359 __ get_thread(tmp);
360 __ cmpptr(tmp, Address(tmp2, InstanceKlass::init_thread_offset()));
361 __ pop(tmp2);
362 __ pop(tmp);
363 __ jcc(Assembler::notEqual, call_patch);
364
365 // access_field patches may execute the patched code before it's
366 // copied back into place so we need to jump back into the main
367 // code of the nmethod to continue execution.
368 __ jmp(_patch_site_continuation);
369
370 // make sure this extra code gets skipped
371 bytes_to_skip += __ offset() - offset;
372 }
373 if (CommentedAssembly) {
374 __ block_comment("patch data encoded as movl");
375 }
376 // Now emit the patch record telling the runtime how to find the
377 // pieces of the patch. We only need 3 bytes but for readability of
378 // the disassembly we make the data look like a movl reg, imm32,
379 // which requires 5 bytes
380 int sizeof_patch_record = 5;
381 bytes_to_skip += sizeof_patch_record;
382
383 // emit the offsets needed to find the code to patch
384 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
385
386 __ emit_int8((unsigned char)0xB8);
387 __ emit_int8(0);
388 __ emit_int8(being_initialized_entry_offset);
389 __ emit_int8(bytes_to_skip);
390 __ emit_int8(_bytes_to_copy);
391 address patch_info_pc = __ pc();
392 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
393
394 address entry = __ pc();
395 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
396 address target = NULL;
397 relocInfo::relocType reloc_type = relocInfo::none;
398 switch (_id) {
399 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
400 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
401 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
402 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
403 default: ShouldNotReachHere();
404 }
405 __ bind(call_patch);
406
407 if (CommentedAssembly) {
408 __ block_comment("patch entry point");
409 }
410 __ call(RuntimeAddress(target));
411 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
412 ce->add_call_info_here(_info);
413 int jmp_off = __ offset();
414 __ jmp(_patch_site_entry);
415 // Add enough nops so deoptimization can overwrite the jmp above with a call
416 // and not destroy the world. We cannot use fat nops here, since the concurrent
417 // code rewrite may transiently create the illegal instruction sequence.
418 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
419 __ nop();
420 }
421 if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
422 CodeSection* cs = __ code_section();
423 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
424 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, reloc_type, relocInfo::none);
425 }
426 }
427
428
429 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
430 __ bind(_entry);
431 ce->store_parameter(_trap_request, 0);
432 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));
433 ce->add_call_info_here(_info);
434 DEBUG_ONLY(__ should_not_reach_here());
435 }
436
437
438 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
439 address a;
440 if (_info->deoptimize_on_exception()) {
441 // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
442 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
443 } else {
444 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
445 }
446
447 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
448 __ bind(_entry);
449 __ call(RuntimeAddress(a));
450 ce->add_call_info_here(_info);
451 ce->verify_oop_map(_info);
452 debug_only(__ should_not_reach_here());
453 }
454
455
456 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
457 assert(__ rsp_offset() == 0, "frame size should be fixed");
458
459 __ bind(_entry);
460 // pass the object on stack because all registers must be preserved
461 if (_obj->is_cpu_register()) {
462 ce->store_parameter(_obj->as_register(), 0);
463 }
464 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
465 ce->add_call_info_here(_info);
466 debug_only(__ should_not_reach_here());
467 }
468
469
470 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
471 //---------------slow case: call to native-----------------
472 __ bind(_entry);
473 // Figure out where the args should go
474 // This should really convert the IntrinsicID to the Method* and signature
475 // but I don't know how to do that.
476 //
477 VMRegPair args[5];
478 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
479 SharedRuntime::java_calling_convention(signature, args, 5, true);
480
481 // push parameters
482 // (src, src_pos, dest, destPos, length)
483 Register r[5];
484 r[0] = src()->as_register();
485 r[1] = src_pos()->as_register();
486 r[2] = dst()->as_register();
487 r[3] = dst_pos()->as_register();
488 r[4] = length()->as_register();
489
490 // next registers will get stored on the stack
491 for (int i = 0; i < 5 ; i++ ) {
492 VMReg r_1 = args[i].first();
493 if (r_1->is_stack()) {
494 int st_off = r_1->reg2stack() * wordSize;
495 __ movptr (Address(rsp, st_off), r[i]);
496 } else {
497 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
498 }
499 }
500
501 ce->align_call(lir_static_call);
502
503 ce->emit_static_call_stub();
504 if (ce->compilation()->bailed_out()) {
505 return; // CodeCache is full
506 }
507 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
508 relocInfo::static_call_type);
509 __ call(resolve);
510 ce->add_call_info_here(info());
511
512 #ifndef PRODUCT
513 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
514 #endif
515
516 __ jmp(_continuation);
517 }
518
519 #undef __