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())); 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 } 403 404 405 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) { 406 assert(__ rsp_offset() == 0, "frame size should be fixed"); 407 408 __ bind(_entry); 409 // pass the object on stack because all registers must be preserved 410 if (_obj->is_cpu_register()) { 411 ce->store_parameter(_obj->as_register(), 0); 412 } 413 __ call(RuntimeAddress(Runtime1::entry_for(_stub))); 414 ce->add_call_info_here(_info); 415 debug_only(__ should_not_reach_here()); 416 } 417 418 419 void ArrayCopyStub::emit_code(LIR_Assembler* ce) { 420 //---------------slow case: call to native----------------- 421 __ bind(_entry); 422 // Figure out where the args should go 423 // This should really convert the IntrinsicID to the methodOop and signature 424 // but I don't know how to do that. 425 // 426 VMRegPair args[5]; 427 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT}; 428 SharedRuntime::java_calling_convention(signature, args, 5, true); 429 430 // push parameters 431 // (src, src_pos, dest, destPos, length) 432 Register r[5]; 433 r[0] = src()->as_register(); 434 r[1] = src_pos()->as_register(); 435 r[2] = dst()->as_register(); 436 r[3] = dst_pos()->as_register(); 437 r[4] = length()->as_register(); 438 439 // next registers will get stored on the stack 440 for (int i = 0; i < 5 ; i++ ) { 441 VMReg r_1 = args[i].first(); 442 if (r_1->is_stack()) { 443 int st_off = r_1->reg2stack() * wordSize; 444 __ movptr (Address(rsp, st_off), r[i]); 445 } else { 446 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg "); 447 } 448 } 449 450 ce->align_call(lir_static_call); 451 452 ce->emit_static_call_stub(); 453 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(), 454 relocInfo::static_call_type); 455 __ call(resolve); 456 ce->add_call_info_here(info()); 457 458 #ifndef PRODUCT 459 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt)); 460 #endif 461 462 __ jmp(_continuation); 463 } 464 465 ///////////////////////////////////////////////////////////////////////////// 466 #ifndef SERIALGC 467 468 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) { 469 // At this point we know that marking is in progress. 470 // If do_load() is true then we have to emit the 471 // load of the previous value; otherwise it has already 472 // been loaded into _pre_val. 473 474 __ bind(_entry); 475 assert(pre_val()->is_register(), "Precondition."); 476 477 Register pre_val_reg = pre_val()->as_register(); 478 479 if (do_load()) { 480 ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/); 481 } 482 483 __ cmpptr(pre_val_reg, (int32_t) NULL_WORD); 484 __ jcc(Assembler::equal, _continuation); 485 ce->store_parameter(pre_val()->as_register(), 0); 486 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id))); 487 __ jmp(_continuation); 488 489 } 490 491 void G1UnsafeGetObjSATBBarrierStub::emit_code(LIR_Assembler* ce) { 492 // At this point we know that offset == referent_offset. 493 // 494 // So we might have to emit: 495 // if (src == null) goto continuation. 496 // 497 // and we definitely have to emit: 498 // if (klass(src).reference_type == REF_NONE) goto continuation 499 // if (!marking_active) goto continuation 500 // if (pre_val == null) goto continuation 501 // call pre_barrier(pre_val) 502 // goto continuation 503 // 504 __ bind(_entry); 505 506 assert(src()->is_register(), "sanity"); 507 Register src_reg = src()->as_register(); 508 509 if (gen_src_check()) { 510 // The original src operand was not a constant. 511 // Generate src == null? 512 __ cmpptr(src_reg, (int32_t) NULL_WORD); 513 __ jcc(Assembler::equal, _continuation); 514 } 515 516 // Generate src->_klass->_reference_type == REF_NONE)? 517 assert(tmp()->is_register(), "sanity"); 518 Register tmp_reg = tmp()->as_register(); 519 520 __ load_klass(tmp_reg, src_reg); 521 522 Address ref_type_adr(tmp_reg, instanceKlass::reference_type_offset()); 523 __ cmpl(ref_type_adr, REF_NONE); 524 __ jcc(Assembler::equal, _continuation); 525 526 // Is marking active? 527 assert(thread()->is_register(), "precondition"); 528 Register thread_reg = thread()->as_pointer_register(); 529 530 Address in_progress(thread_reg, in_bytes(JavaThread::satb_mark_queue_offset() + 531 PtrQueue::byte_offset_of_active())); 532 533 if (in_bytes(PtrQueue::byte_width_of_active()) == 4) { 534 __ cmpl(in_progress, 0); 535 } else { 536 assert(in_bytes(PtrQueue::byte_width_of_active()) == 1, "Assumption"); 537 __ cmpb(in_progress, 0); 538 } 539 __ jcc(Assembler::equal, _continuation); 540 541 // val == null? 542 assert(val()->is_register(), "Precondition."); 543 Register val_reg = val()->as_register(); 544 545 __ cmpptr(val_reg, (int32_t) NULL_WORD); 546 __ jcc(Assembler::equal, _continuation); 547 548 ce->store_parameter(val()->as_register(), 0); 549 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id))); 550 __ jmp(_continuation); 551 } 552 553 jbyte* G1PostBarrierStub::_byte_map_base = NULL; 554 555 jbyte* G1PostBarrierStub::byte_map_base_slow() { 556 BarrierSet* bs = Universe::heap()->barrier_set(); 557 assert(bs->is_a(BarrierSet::G1SATBCTLogging), 558 "Must be if we're using this."); 559 return ((G1SATBCardTableModRefBS*)bs)->byte_map_base; 560 } 561 562 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) { 563 __ bind(_entry); 564 assert(addr()->is_register(), "Precondition."); 565 assert(new_val()->is_register(), "Precondition."); 566 Register new_val_reg = new_val()->as_register(); 567 __ cmpptr(new_val_reg, (int32_t) NULL_WORD); 568 __ jcc(Assembler::equal, _continuation); 569 ce->store_parameter(addr()->as_pointer_register(), 0); 570 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id))); 571 __ jmp(_continuation); 572 } 573 574 #endif // SERIALGC 575 ///////////////////////////////////////////////////////////////////////////// 576 577 #undef __