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 #if INCLUDE_ALL_GCS 37 #include "gc/g1/g1BarrierSet.hpp" 38 #endif // INCLUDE_ALL_GCS 39 40 41 #define __ ce->masm()-> 42 43 float ConversionStub::float_zero = 0.0; 44 double ConversionStub::double_zero = 0.0; 45 46 void ConversionStub::emit_code(LIR_Assembler* ce) { 47 __ bind(_entry); 48 assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub"); 49 50 51 if (input()->is_single_xmm()) { 52 __ comiss(input()->as_xmm_float_reg(), 53 ExternalAddress((address)&float_zero)); 54 } else if (input()->is_double_xmm()) { 55 __ comisd(input()->as_xmm_double_reg(), 56 ExternalAddress((address)&double_zero)); 57 } else { 58 LP64_ONLY(ShouldNotReachHere()); 59 __ push(rax); 60 __ ftst(); 61 __ fnstsw_ax(); 62 __ sahf(); 63 __ pop(rax); 64 } 65 66 Label NaN, do_return; 67 __ jccb(Assembler::parity, NaN); 68 __ jccb(Assembler::below, do_return); 69 70 // input is > 0 -> return maxInt 71 // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff 72 __ decrement(result()->as_register()); 73 __ jmpb(do_return); 74 75 // input is NaN -> return 0 76 __ bind(NaN); 77 __ xorptr(result()->as_register(), result()->as_register()); 78 79 __ bind(do_return); 80 __ jmp(_continuation); 81 } 82 83 void CounterOverflowStub::emit_code(LIR_Assembler* ce) { 84 __ bind(_entry); 85 Metadata *m = _method->as_constant_ptr()->as_metadata(); 86 ce->store_parameter(m, 1); 87 ce->store_parameter(_bci, 0); 88 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id))); 89 ce->add_call_info_here(_info); 90 ce->verify_oop_map(_info); 91 __ jmp(_continuation); 92 } 93 94 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, 95 bool throw_index_out_of_bounds_exception) 96 : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception) 97 , _index(index) 98 { 99 assert(info != NULL, "must have info"); 100 _info = new CodeEmitInfo(info); 101 } 102 103 104 void RangeCheckStub::emit_code(LIR_Assembler* ce) { 105 __ bind(_entry); 106 if (_info->deoptimize_on_exception()) { 107 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id); 108 __ call(RuntimeAddress(a)); 109 ce->add_call_info_here(_info); 110 ce->verify_oop_map(_info); 111 debug_only(__ should_not_reach_here()); 112 return; 113 } 114 115 // pass the array index on stack because all registers must be preserved 116 if (_index->is_cpu_register()) { 117 ce->store_parameter(_index->as_register(), 0); 118 } else { 119 ce->store_parameter(_index->as_jint(), 0); 120 } 121 Runtime1::StubID stub_id; 122 if (_throw_index_out_of_bounds_exception) { 123 stub_id = Runtime1::throw_index_exception_id; 124 } else { 125 stub_id = Runtime1::throw_range_check_failed_id; 126 } 127 __ call(RuntimeAddress(Runtime1::entry_for(stub_id))); 128 ce->add_call_info_here(_info); 129 ce->verify_oop_map(_info); 130 debug_only(__ should_not_reach_here()); 131 } 132 133 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) { 134 _info = new CodeEmitInfo(info); 135 } 136 137 void PredicateFailedStub::emit_code(LIR_Assembler* ce) { 138 __ bind(_entry); 139 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id); 140 __ call(RuntimeAddress(a)); 141 ce->add_call_info_here(_info); 142 ce->verify_oop_map(_info); 143 debug_only(__ should_not_reach_here()); 144 } 145 146 void DivByZeroStub::emit_code(LIR_Assembler* ce) { 147 if (_offset != -1) { 148 ce->compilation()->implicit_exception_table()->append(_offset, __ offset()); 149 } 150 __ bind(_entry); 151 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id))); 152 ce->add_call_info_here(_info); 153 debug_only(__ should_not_reach_here()); 154 } 155 156 157 // Implementation of NewInstanceStub 158 159 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) { 160 _result = result; 161 _klass = klass; 162 _klass_reg = klass_reg; 163 _info = new CodeEmitInfo(info); 164 assert(stub_id == Runtime1::new_instance_id || 165 stub_id == Runtime1::fast_new_instance_id || 166 stub_id == Runtime1::fast_new_instance_init_check_id, 167 "need new_instance id"); 168 _stub_id = stub_id; 169 } 170 171 172 void NewInstanceStub::emit_code(LIR_Assembler* ce) { 173 assert(__ rsp_offset() == 0, "frame size should be fixed"); 174 __ bind(_entry); 175 __ movptr(rdx, _klass_reg->as_register()); 176 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id))); 177 ce->add_call_info_here(_info); 178 ce->verify_oop_map(_info); 179 assert(_result->as_register() == rax, "result must in rax,"); 180 __ jmp(_continuation); 181 } 182 183 184 // Implementation of NewTypeArrayStub 185 186 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) { 187 _klass_reg = klass_reg; 188 _length = length; 189 _result = result; 190 _info = new CodeEmitInfo(info); 191 } 192 193 194 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) { 195 assert(__ rsp_offset() == 0, "frame size should be fixed"); 196 __ bind(_entry); 197 assert(_length->as_register() == rbx, "length must in rbx,"); 198 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx"); 199 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id))); 200 ce->add_call_info_here(_info); 201 ce->verify_oop_map(_info); 202 assert(_result->as_register() == rax, "result must in rax,"); 203 __ jmp(_continuation); 204 } 205 206 207 // Implementation of NewObjectArrayStub 208 209 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) { 210 _klass_reg = klass_reg; 211 _result = result; 212 _length = length; 213 _info = new CodeEmitInfo(info); 214 } 215 216 217 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) { 218 assert(__ rsp_offset() == 0, "frame size should be fixed"); 219 __ bind(_entry); 220 assert(_length->as_register() == rbx, "length must in rbx,"); 221 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx"); 222 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id))); 223 ce->add_call_info_here(_info); 224 ce->verify_oop_map(_info); 225 assert(_result->as_register() == rax, "result must in rax,"); 226 __ jmp(_continuation); 227 } 228 229 230 // Implementation of MonitorAccessStubs 231 232 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info) 233 : MonitorAccessStub(obj_reg, lock_reg) 234 { 235 _info = new CodeEmitInfo(info); 236 } 237 238 239 void MonitorEnterStub::emit_code(LIR_Assembler* ce) { 240 assert(__ rsp_offset() == 0, "frame size should be fixed"); 241 __ bind(_entry); 242 ce->store_parameter(_obj_reg->as_register(), 1); 243 ce->store_parameter(_lock_reg->as_register(), 0); 244 Runtime1::StubID enter_id; 245 if (ce->compilation()->has_fpu_code()) { 246 enter_id = Runtime1::monitorenter_id; 247 } else { 248 enter_id = Runtime1::monitorenter_nofpu_id; 249 } 250 __ call(RuntimeAddress(Runtime1::entry_for(enter_id))); 251 ce->add_call_info_here(_info); 252 ce->verify_oop_map(_info); 253 __ jmp(_continuation); 254 } 255 256 257 void MonitorExitStub::emit_code(LIR_Assembler* ce) { 258 __ bind(_entry); 259 if (_compute_lock) { 260 // lock_reg was destroyed by fast unlocking attempt => recompute it 261 ce->monitor_address(_monitor_ix, _lock_reg); 262 } 263 ce->store_parameter(_lock_reg->as_register(), 0); 264 // note: non-blocking leaf routine => no call info needed 265 Runtime1::StubID exit_id; 266 if (ce->compilation()->has_fpu_code()) { 267 exit_id = Runtime1::monitorexit_id; 268 } else { 269 exit_id = Runtime1::monitorexit_nofpu_id; 270 } 271 __ call(RuntimeAddress(Runtime1::entry_for(exit_id))); 272 __ jmp(_continuation); 273 } 274 275 276 // Implementation of patching: 277 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes) 278 // - Replace original code with a call to the stub 279 // At Runtime: 280 // - call to stub, jump to runtime 281 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object) 282 // - in runtime: after initializing class, restore original code, reexecute instruction 283 284 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size; 285 286 void PatchingStub::align_patch_site(MacroAssembler* masm) { 287 // We're patching a 5-7 byte instruction on intel and we need to 288 // make sure that we don't see a piece of the instruction. It 289 // appears mostly impossible on Intel to simply invalidate other 290 // processors caches and since they may do aggressive prefetch it's 291 // very hard to make a guess about what code might be in the icache. 292 // Force the instruction to be double word aligned so that it 293 // doesn't span a cache line. 294 masm->align(align_up((int)NativeGeneralJump::instruction_size, wordSize)); 295 } 296 297 void PatchingStub::emit_code(LIR_Assembler* ce) { 298 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call"); 299 300 Label call_patch; 301 302 // static field accesses have special semantics while the class 303 // initializer is being run so we emit a test which can be used to 304 // check that this code is being executed by the initializing 305 // thread. 306 address being_initialized_entry = __ pc(); 307 if (CommentedAssembly) { 308 __ block_comment(" patch template"); 309 } 310 if (_id == load_klass_id) { 311 // produce a copy of the load klass instruction for use by the being initialized case 312 #ifdef ASSERT 313 address start = __ pc(); 314 #endif 315 Metadata* o = NULL; 316 __ mov_metadata(_obj, o); 317 #ifdef ASSERT 318 for (int i = 0; i < _bytes_to_copy; i++) { 319 address ptr = (address)(_pc_start + i); 320 int a_byte = (*ptr) & 0xFF; 321 assert(a_byte == *start++, "should be the same code"); 322 } 323 #endif 324 } else if (_id == load_mirror_id) { 325 // produce a copy of the load mirror instruction for use by the being 326 // initialized case 327 #ifdef ASSERT 328 address start = __ pc(); 329 #endif 330 jobject o = NULL; 331 __ movoop(_obj, o); 332 #ifdef ASSERT 333 for (int i = 0; i < _bytes_to_copy; i++) { 334 address ptr = (address)(_pc_start + i); 335 int a_byte = (*ptr) & 0xFF; 336 assert(a_byte == *start++, "should be the same code"); 337 } 338 #endif 339 } else { 340 // make a copy the code which is going to be patched. 341 for (int i = 0; i < _bytes_to_copy; i++) { 342 address ptr = (address)(_pc_start + i); 343 int a_byte = (*ptr) & 0xFF; 344 __ emit_int8(a_byte); 345 *ptr = 0x90; // make the site look like a nop 346 } 347 } 348 349 address end_of_patch = __ pc(); 350 int bytes_to_skip = 0; 351 if (_id == load_mirror_id) { 352 int offset = __ offset(); 353 if (CommentedAssembly) { 354 __ block_comment(" being_initialized check"); 355 } 356 assert(_obj != noreg, "must be a valid register"); 357 Register tmp = rax; 358 Register tmp2 = rbx; 359 __ push(tmp); 360 __ push(tmp2); 361 // Load without verification to keep code size small. We need it because 362 // begin_initialized_entry_offset has to fit in a byte. Also, we know it's not null. 363 __ movptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes())); 364 __ get_thread(tmp); 365 __ cmpptr(tmp, Address(tmp2, InstanceKlass::init_thread_offset())); 366 __ pop(tmp2); 367 __ pop(tmp); 368 __ jcc(Assembler::notEqual, call_patch); 369 370 // access_field patches may execute the patched code before it's 371 // copied back into place so we need to jump back into the main 372 // code of the nmethod to continue execution. 373 __ jmp(_patch_site_continuation); 374 375 // make sure this extra code gets skipped 376 bytes_to_skip += __ offset() - offset; 377 } 378 if (CommentedAssembly) { 379 __ block_comment("patch data encoded as movl"); 380 } 381 // Now emit the patch record telling the runtime how to find the 382 // pieces of the patch. We only need 3 bytes but for readability of 383 // the disassembly we make the data look like a movl reg, imm32, 384 // which requires 5 bytes 385 int sizeof_patch_record = 5; 386 bytes_to_skip += sizeof_patch_record; 387 388 // emit the offsets needed to find the code to patch 389 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record; 390 391 __ emit_int8((unsigned char)0xB8); 392 __ emit_int8(0); 393 __ emit_int8(being_initialized_entry_offset); 394 __ emit_int8(bytes_to_skip); 395 __ emit_int8(_bytes_to_copy); 396 address patch_info_pc = __ pc(); 397 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info"); 398 399 address entry = __ pc(); 400 NativeGeneralJump::insert_unconditional((address)_pc_start, entry); 401 address target = NULL; 402 relocInfo::relocType reloc_type = relocInfo::none; 403 switch (_id) { 404 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break; 405 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break; 406 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break; 407 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break; 408 default: ShouldNotReachHere(); 409 } 410 __ bind(call_patch); 411 412 if (CommentedAssembly) { 413 __ block_comment("patch entry point"); 414 } 415 __ call(RuntimeAddress(target)); 416 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change"); 417 ce->add_call_info_here(_info); 418 int jmp_off = __ offset(); 419 __ jmp(_patch_site_entry); 420 // Add enough nops so deoptimization can overwrite the jmp above with a call 421 // and not destroy the world. We cannot use fat nops here, since the concurrent 422 // code rewrite may transiently create the illegal instruction sequence. 423 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) { 424 __ nop(); 425 } 426 if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) { 427 CodeSection* cs = __ code_section(); 428 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1)); 429 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, reloc_type, relocInfo::none); 430 } 431 } 432 433 434 void DeoptimizeStub::emit_code(LIR_Assembler* ce) { 435 __ bind(_entry); 436 ce->store_parameter(_trap_request, 0); 437 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id))); 438 ce->add_call_info_here(_info); 439 DEBUG_ONLY(__ should_not_reach_here()); 440 } 441 442 443 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) { 444 address a; 445 if (_info->deoptimize_on_exception()) { 446 // Deoptimize, do not throw the exception, because it is probably wrong to do it here. 447 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id); 448 } else { 449 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id); 450 } 451 452 ce->compilation()->implicit_exception_table()->append(_offset, __ offset()); 453 __ bind(_entry); 454 __ call(RuntimeAddress(a)); 455 ce->add_call_info_here(_info); 456 ce->verify_oop_map(_info); 457 debug_only(__ should_not_reach_here()); 458 } 459 460 461 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) { 462 assert(__ rsp_offset() == 0, "frame size should be fixed"); 463 464 __ bind(_entry); 465 // pass the object on stack because all registers must be preserved 466 if (_obj->is_cpu_register()) { 467 ce->store_parameter(_obj->as_register(), 0); 468 } 469 __ call(RuntimeAddress(Runtime1::entry_for(_stub))); 470 ce->add_call_info_here(_info); 471 debug_only(__ should_not_reach_here()); 472 } 473 474 475 void ArrayCopyStub::emit_code(LIR_Assembler* ce) { 476 //---------------slow case: call to native----------------- 477 __ bind(_entry); 478 // Figure out where the args should go 479 // This should really convert the IntrinsicID to the Method* and signature 480 // but I don't know how to do that. 481 // 482 VMRegPair args[5]; 483 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT}; 484 SharedRuntime::java_calling_convention(signature, args, 5, true); 485 486 // push parameters 487 // (src, src_pos, dest, destPos, length) 488 Register r[5]; 489 r[0] = src()->as_register(); 490 r[1] = src_pos()->as_register(); 491 r[2] = dst()->as_register(); 492 r[3] = dst_pos()->as_register(); 493 r[4] = length()->as_register(); 494 495 // next registers will get stored on the stack 496 for (int i = 0; i < 5 ; i++ ) { 497 VMReg r_1 = args[i].first(); 498 if (r_1->is_stack()) { 499 int st_off = r_1->reg2stack() * wordSize; 500 __ movptr (Address(rsp, st_off), r[i]); 501 } else { 502 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg "); 503 } 504 } 505 506 ce->align_call(lir_static_call); 507 508 ce->emit_static_call_stub(); 509 if (ce->compilation()->bailed_out()) { 510 return; // CodeCache is full 511 } 512 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(), 513 relocInfo::static_call_type); 514 __ call(resolve); 515 ce->add_call_info_here(info()); 516 517 #ifndef PRODUCT 518 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt)); 519 #endif 520 521 __ jmp(_continuation); 522 } 523 524 ///////////////////////////////////////////////////////////////////////////// 525 #if INCLUDE_ALL_GCS 526 527 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) { 528 // At this point we know that marking is in progress. 529 // If do_load() is true then we have to emit the 530 // load of the previous value; otherwise it has already 531 // been loaded into _pre_val. 532 533 __ bind(_entry); 534 assert(pre_val()->is_register(), "Precondition."); 535 536 Register pre_val_reg = pre_val()->as_register(); 537 538 if (do_load()) { 539 ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/); 540 } 541 542 __ cmpptr(pre_val_reg, (int32_t) NULL_WORD); 543 __ jcc(Assembler::equal, _continuation); 544 ce->store_parameter(pre_val()->as_register(), 0); 545 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id))); 546 __ jmp(_continuation); 547 548 } 549 550 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) { 551 __ bind(_entry); 552 assert(addr()->is_register(), "Precondition."); 553 assert(new_val()->is_register(), "Precondition."); 554 Register new_val_reg = new_val()->as_register(); 555 __ cmpptr(new_val_reg, (int32_t) NULL_WORD); 556 __ jcc(Assembler::equal, _continuation); 557 ce->store_parameter(addr()->as_pointer_register(), 0); 558 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id))); 559 __ jmp(_continuation); 560 } 561 562 #endif // INCLUDE_ALL_GCS 563 ///////////////////////////////////////////////////////////////////////////// 564 565 #undef __