codegen_util.cc revision 06606b9c4a1c00154ed15f719ad8ea994e54ee8e
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "dex/compiler_internals.h" 18#include "dex_file-inl.h" 19#include "gc_map.h" 20#include "mapping_table.h" 21#include "mir_to_lir-inl.h" 22#include "verifier/dex_gc_map.h" 23#include "verifier/method_verifier.h" 24 25namespace art { 26 27namespace { 28 29/* Dump a mapping table */ 30template <typename It> 31void DumpMappingTable(const char* table_name, const char* descriptor, const char* name, 32 const Signature& signature, uint32_t size, It first) { 33 if (size != 0) { 34 std::string line(StringPrintf("\n %s %s%s_%s_table[%zu] = {", table_name, 35 descriptor, name, signature.ToString().c_str(), size)); 36 std::replace(line.begin(), line.end(), ';', '_'); 37 LOG(INFO) << line; 38 for (uint32_t i = 0; i != size; ++i) { 39 line = StringPrintf(" {0x%05x, 0x%04x},", first.NativePcOffset(), first.DexPc()); 40 ++first; 41 LOG(INFO) << line; 42 } 43 LOG(INFO) <<" };\n\n"; 44 } 45} 46 47} // anonymous namespace 48 49bool Mir2Lir::IsInexpensiveConstant(RegLocation rl_src) { 50 bool res = false; 51 if (rl_src.is_const) { 52 if (rl_src.wide) { 53 if (rl_src.fp) { 54 res = InexpensiveConstantDouble(mir_graph_->ConstantValueWide(rl_src)); 55 } else { 56 res = InexpensiveConstantLong(mir_graph_->ConstantValueWide(rl_src)); 57 } 58 } else { 59 if (rl_src.fp) { 60 res = InexpensiveConstantFloat(mir_graph_->ConstantValue(rl_src)); 61 } else { 62 res = InexpensiveConstantInt(mir_graph_->ConstantValue(rl_src)); 63 } 64 } 65 } 66 return res; 67} 68 69void Mir2Lir::MarkSafepointPC(LIR* inst) { 70 DCHECK(!inst->flags.use_def_invalid); 71 inst->u.m.def_mask = ENCODE_ALL; 72 LIR* safepoint_pc = NewLIR0(kPseudoSafepointPC); 73 DCHECK_EQ(safepoint_pc->u.m.def_mask, ENCODE_ALL); 74} 75 76bool Mir2Lir::FastInstance(uint32_t field_idx, bool is_put, int* field_offset, bool* is_volatile) { 77 return cu_->compiler_driver->ComputeInstanceFieldInfo( 78 field_idx, mir_graph_->GetCurrentDexCompilationUnit(), is_put, field_offset, is_volatile); 79} 80 81/* Remove a LIR from the list. */ 82void Mir2Lir::UnlinkLIR(LIR* lir) { 83 if (UNLIKELY(lir == first_lir_insn_)) { 84 first_lir_insn_ = lir->next; 85 if (lir->next != NULL) { 86 lir->next->prev = NULL; 87 } else { 88 DCHECK(lir->next == NULL); 89 DCHECK(lir == last_lir_insn_); 90 last_lir_insn_ = NULL; 91 } 92 } else if (lir == last_lir_insn_) { 93 last_lir_insn_ = lir->prev; 94 lir->prev->next = NULL; 95 } else if ((lir->prev != NULL) && (lir->next != NULL)) { 96 lir->prev->next = lir->next; 97 lir->next->prev = lir->prev; 98 } 99} 100 101/* Convert an instruction to a NOP */ 102void Mir2Lir::NopLIR(LIR* lir) { 103 lir->flags.is_nop = true; 104 if (!cu_->verbose) { 105 UnlinkLIR(lir); 106 } 107} 108 109void Mir2Lir::SetMemRefType(LIR* lir, bool is_load, int mem_type) { 110 uint64_t *mask_ptr; 111 uint64_t mask = ENCODE_MEM; 112 DCHECK(GetTargetInstFlags(lir->opcode) & (IS_LOAD | IS_STORE)); 113 DCHECK(!lir->flags.use_def_invalid); 114 if (is_load) { 115 mask_ptr = &lir->u.m.use_mask; 116 } else { 117 mask_ptr = &lir->u.m.def_mask; 118 } 119 /* Clear out the memref flags */ 120 *mask_ptr &= ~mask; 121 /* ..and then add back the one we need */ 122 switch (mem_type) { 123 case kLiteral: 124 DCHECK(is_load); 125 *mask_ptr |= ENCODE_LITERAL; 126 break; 127 case kDalvikReg: 128 *mask_ptr |= ENCODE_DALVIK_REG; 129 break; 130 case kHeapRef: 131 *mask_ptr |= ENCODE_HEAP_REF; 132 break; 133 case kMustNotAlias: 134 /* Currently only loads can be marked as kMustNotAlias */ 135 DCHECK(!(GetTargetInstFlags(lir->opcode) & IS_STORE)); 136 *mask_ptr |= ENCODE_MUST_NOT_ALIAS; 137 break; 138 default: 139 LOG(FATAL) << "Oat: invalid memref kind - " << mem_type; 140 } 141} 142 143/* 144 * Mark load/store instructions that access Dalvik registers through the stack. 145 */ 146void Mir2Lir::AnnotateDalvikRegAccess(LIR* lir, int reg_id, bool is_load, 147 bool is64bit) { 148 SetMemRefType(lir, is_load, kDalvikReg); 149 150 /* 151 * Store the Dalvik register id in alias_info. Mark the MSB if it is a 64-bit 152 * access. 153 */ 154 lir->flags.alias_info = ENCODE_ALIAS_INFO(reg_id, is64bit); 155} 156 157/* 158 * Debugging macros 159 */ 160#define DUMP_RESOURCE_MASK(X) 161 162/* Pretty-print a LIR instruction */ 163void Mir2Lir::DumpLIRInsn(LIR* lir, unsigned char* base_addr) { 164 int offset = lir->offset; 165 int dest = lir->operands[0]; 166 const bool dump_nop = (cu_->enable_debug & (1 << kDebugShowNops)); 167 168 /* Handle pseudo-ops individually, and all regular insns as a group */ 169 switch (lir->opcode) { 170 case kPseudoMethodEntry: 171 LOG(INFO) << "-------- method entry " 172 << PrettyMethod(cu_->method_idx, *cu_->dex_file); 173 break; 174 case kPseudoMethodExit: 175 LOG(INFO) << "-------- Method_Exit"; 176 break; 177 case kPseudoBarrier: 178 LOG(INFO) << "-------- BARRIER"; 179 break; 180 case kPseudoEntryBlock: 181 LOG(INFO) << "-------- entry offset: 0x" << std::hex << dest; 182 break; 183 case kPseudoDalvikByteCodeBoundary: 184 if (lir->operands[0] == 0) { 185 // NOTE: only used for debug listings. 186 lir->operands[0] = WrapPointer(ArenaStrdup("No instruction string")); 187 } 188 LOG(INFO) << "-------- dalvik offset: 0x" << std::hex 189 << lir->dalvik_offset << " @ " 190 << reinterpret_cast<char*>(UnwrapPointer(lir->operands[0])); 191 break; 192 case kPseudoExitBlock: 193 LOG(INFO) << "-------- exit offset: 0x" << std::hex << dest; 194 break; 195 case kPseudoPseudoAlign4: 196 LOG(INFO) << reinterpret_cast<uintptr_t>(base_addr) + offset << " (0x" << std::hex 197 << offset << "): .align4"; 198 break; 199 case kPseudoEHBlockLabel: 200 LOG(INFO) << "Exception_Handling:"; 201 break; 202 case kPseudoTargetLabel: 203 case kPseudoNormalBlockLabel: 204 LOG(INFO) << "L" << reinterpret_cast<void*>(lir) << ":"; 205 break; 206 case kPseudoThrowTarget: 207 LOG(INFO) << "LT" << reinterpret_cast<void*>(lir) << ":"; 208 break; 209 case kPseudoIntrinsicRetry: 210 LOG(INFO) << "IR" << reinterpret_cast<void*>(lir) << ":"; 211 break; 212 case kPseudoSuspendTarget: 213 LOG(INFO) << "LS" << reinterpret_cast<void*>(lir) << ":"; 214 break; 215 case kPseudoSafepointPC: 216 LOG(INFO) << "LsafepointPC_0x" << std::hex << lir->offset << "_" << lir->dalvik_offset << ":"; 217 break; 218 case kPseudoExportedPC: 219 LOG(INFO) << "LexportedPC_0x" << std::hex << lir->offset << "_" << lir->dalvik_offset << ":"; 220 break; 221 case kPseudoCaseLabel: 222 LOG(INFO) << "LC" << reinterpret_cast<void*>(lir) << ": Case target 0x" 223 << std::hex << lir->operands[0] << "|" << std::dec << 224 lir->operands[0]; 225 break; 226 default: 227 if (lir->flags.is_nop && !dump_nop) { 228 break; 229 } else { 230 std::string op_name(BuildInsnString(GetTargetInstName(lir->opcode), 231 lir, base_addr)); 232 std::string op_operands(BuildInsnString(GetTargetInstFmt(lir->opcode), 233 lir, base_addr)); 234 LOG(INFO) << StringPrintf("%05x: %-9s%s%s", 235 reinterpret_cast<unsigned int>(base_addr + offset), 236 op_name.c_str(), op_operands.c_str(), 237 lir->flags.is_nop ? "(nop)" : ""); 238 } 239 break; 240 } 241 242 if (lir->u.m.use_mask && (!lir->flags.is_nop || dump_nop)) { 243 DUMP_RESOURCE_MASK(DumpResourceMask(lir, lir->u.m.use_mask, "use")); 244 } 245 if (lir->u.m.def_mask && (!lir->flags.is_nop || dump_nop)) { 246 DUMP_RESOURCE_MASK(DumpResourceMask(lir, lir->u.m.def_mask, "def")); 247 } 248} 249 250void Mir2Lir::DumpPromotionMap() { 251 int num_regs = cu_->num_dalvik_registers + cu_->num_compiler_temps + 1; 252 for (int i = 0; i < num_regs; i++) { 253 PromotionMap v_reg_map = promotion_map_[i]; 254 std::string buf; 255 if (v_reg_map.fp_location == kLocPhysReg) { 256 StringAppendF(&buf, " : s%d", v_reg_map.FpReg & FpRegMask()); 257 } 258 259 std::string buf3; 260 if (i < cu_->num_dalvik_registers) { 261 StringAppendF(&buf3, "%02d", i); 262 } else if (i == mir_graph_->GetMethodSReg()) { 263 buf3 = "Method*"; 264 } else { 265 StringAppendF(&buf3, "ct%d", i - cu_->num_dalvik_registers); 266 } 267 268 LOG(INFO) << StringPrintf("V[%s] -> %s%d%s", buf3.c_str(), 269 v_reg_map.core_location == kLocPhysReg ? 270 "r" : "SP+", v_reg_map.core_location == kLocPhysReg ? 271 v_reg_map.core_reg : SRegOffset(i), 272 buf.c_str()); 273 } 274} 275 276/* Dump instructions and constant pool contents */ 277void Mir2Lir::CodegenDump() { 278 LOG(INFO) << "Dumping LIR insns for " 279 << PrettyMethod(cu_->method_idx, *cu_->dex_file); 280 LIR* lir_insn; 281 int insns_size = cu_->code_item->insns_size_in_code_units_; 282 283 LOG(INFO) << "Regs (excluding ins) : " << cu_->num_regs; 284 LOG(INFO) << "Ins : " << cu_->num_ins; 285 LOG(INFO) << "Outs : " << cu_->num_outs; 286 LOG(INFO) << "CoreSpills : " << num_core_spills_; 287 LOG(INFO) << "FPSpills : " << num_fp_spills_; 288 LOG(INFO) << "CompilerTemps : " << cu_->num_compiler_temps; 289 LOG(INFO) << "Frame size : " << frame_size_; 290 LOG(INFO) << "code size is " << total_size_ << 291 " bytes, Dalvik size is " << insns_size * 2; 292 LOG(INFO) << "expansion factor: " 293 << static_cast<float>(total_size_) / static_cast<float>(insns_size * 2); 294 DumpPromotionMap(); 295 for (lir_insn = first_lir_insn_; lir_insn != NULL; lir_insn = lir_insn->next) { 296 DumpLIRInsn(lir_insn, 0); 297 } 298 for (lir_insn = literal_list_; lir_insn != NULL; lir_insn = lir_insn->next) { 299 LOG(INFO) << StringPrintf("%x (%04x): .word (%#x)", lir_insn->offset, lir_insn->offset, 300 lir_insn->operands[0]); 301 } 302 303 const DexFile::MethodId& method_id = 304 cu_->dex_file->GetMethodId(cu_->method_idx); 305 const Signature signature = cu_->dex_file->GetMethodSignature(method_id); 306 const char* name = cu_->dex_file->GetMethodName(method_id); 307 const char* descriptor(cu_->dex_file->GetMethodDeclaringClassDescriptor(method_id)); 308 309 // Dump mapping tables 310 if (!encoded_mapping_table_.empty()) { 311 MappingTable table(&encoded_mapping_table_[0]); 312 DumpMappingTable("PC2Dex_MappingTable", descriptor, name, signature, 313 table.PcToDexSize(), table.PcToDexBegin()); 314 DumpMappingTable("Dex2PC_MappingTable", descriptor, name, signature, 315 table.DexToPcSize(), table.DexToPcBegin()); 316 } 317} 318 319/* 320 * Search the existing constants in the literal pool for an exact or close match 321 * within specified delta (greater or equal to 0). 322 */ 323LIR* Mir2Lir::ScanLiteralPool(LIR* data_target, int value, unsigned int delta) { 324 while (data_target) { 325 if ((static_cast<unsigned>(value - data_target->operands[0])) <= delta) 326 return data_target; 327 data_target = data_target->next; 328 } 329 return NULL; 330} 331 332/* Search the existing constants in the literal pool for an exact wide match */ 333LIR* Mir2Lir::ScanLiteralPoolWide(LIR* data_target, int val_lo, int val_hi) { 334 bool lo_match = false; 335 LIR* lo_target = NULL; 336 while (data_target) { 337 if (lo_match && (data_target->operands[0] == val_hi)) { 338 // Record high word in case we need to expand this later. 339 lo_target->operands[1] = val_hi; 340 return lo_target; 341 } 342 lo_match = false; 343 if (data_target->operands[0] == val_lo) { 344 lo_match = true; 345 lo_target = data_target; 346 } 347 data_target = data_target->next; 348 } 349 return NULL; 350} 351 352/* 353 * The following are building blocks to insert constants into the pool or 354 * instruction streams. 355 */ 356 357/* Add a 32-bit constant to the constant pool */ 358LIR* Mir2Lir::AddWordData(LIR* *constant_list_p, int value) { 359 /* Add the constant to the literal pool */ 360 if (constant_list_p) { 361 LIR* new_value = static_cast<LIR*>(arena_->Alloc(sizeof(LIR), ArenaAllocator::kAllocData)); 362 new_value->operands[0] = value; 363 new_value->next = *constant_list_p; 364 *constant_list_p = new_value; 365 estimated_native_code_size_ += sizeof(value); 366 return new_value; 367 } 368 return NULL; 369} 370 371/* Add a 64-bit constant to the constant pool or mixed with code */ 372LIR* Mir2Lir::AddWideData(LIR* *constant_list_p, int val_lo, int val_hi) { 373 AddWordData(constant_list_p, val_hi); 374 return AddWordData(constant_list_p, val_lo); 375} 376 377static void PushWord(std::vector<uint8_t>&buf, int data) { 378 buf.push_back(data & 0xff); 379 buf.push_back((data >> 8) & 0xff); 380 buf.push_back((data >> 16) & 0xff); 381 buf.push_back((data >> 24) & 0xff); 382} 383 384// Push 8 bytes on 64-bit systems; 4 on 32-bit systems. 385static void PushPointer(std::vector<uint8_t>&buf, void const* pointer) { 386 uintptr_t data = reinterpret_cast<uintptr_t>(pointer); 387 if (sizeof(void*) == sizeof(uint64_t)) { 388 PushWord(buf, (data >> (sizeof(void*) * 4)) & 0xFFFFFFFF); 389 PushWord(buf, data & 0xFFFFFFFF); 390 } else { 391 PushWord(buf, data); 392 } 393} 394 395static void AlignBuffer(std::vector<uint8_t>&buf, size_t offset) { 396 while (buf.size() < offset) { 397 buf.push_back(0); 398 } 399} 400 401/* Write the literal pool to the output stream */ 402void Mir2Lir::InstallLiteralPools() { 403 AlignBuffer(code_buffer_, data_offset_); 404 LIR* data_lir = literal_list_; 405 while (data_lir != NULL) { 406 PushWord(code_buffer_, data_lir->operands[0]); 407 data_lir = NEXT_LIR(data_lir); 408 } 409 // Push code and method literals, record offsets for the compiler to patch. 410 data_lir = code_literal_list_; 411 while (data_lir != NULL) { 412 uint32_t target = data_lir->operands[0]; 413 cu_->compiler_driver->AddCodePatch(cu_->dex_file, 414 cu_->class_def_idx, 415 cu_->method_idx, 416 cu_->invoke_type, 417 target, 418 static_cast<InvokeType>(data_lir->operands[1]), 419 code_buffer_.size()); 420 const DexFile::MethodId& id = cu_->dex_file->GetMethodId(target); 421 // unique value based on target to ensure code deduplication works 422 PushPointer(code_buffer_, &id); 423 data_lir = NEXT_LIR(data_lir); 424 } 425 data_lir = method_literal_list_; 426 while (data_lir != NULL) { 427 uint32_t target = data_lir->operands[0]; 428 cu_->compiler_driver->AddMethodPatch(cu_->dex_file, 429 cu_->class_def_idx, 430 cu_->method_idx, 431 cu_->invoke_type, 432 target, 433 static_cast<InvokeType>(data_lir->operands[1]), 434 code_buffer_.size()); 435 const DexFile::MethodId& id = cu_->dex_file->GetMethodId(target); 436 // unique value based on target to ensure code deduplication works 437 PushPointer(code_buffer_, &id); 438 data_lir = NEXT_LIR(data_lir); 439 } 440} 441 442/* Write the switch tables to the output stream */ 443void Mir2Lir::InstallSwitchTables() { 444 GrowableArray<SwitchTable*>::Iterator iterator(&switch_tables_); 445 while (true) { 446 Mir2Lir::SwitchTable* tab_rec = iterator.Next(); 447 if (tab_rec == NULL) break; 448 AlignBuffer(code_buffer_, tab_rec->offset); 449 /* 450 * For Arm, our reference point is the address of the bx 451 * instruction that does the launch, so we have to subtract 452 * the auto pc-advance. For other targets the reference point 453 * is a label, so we can use the offset as-is. 454 */ 455 int bx_offset = INVALID_OFFSET; 456 switch (cu_->instruction_set) { 457 case kThumb2: 458 DCHECK(tab_rec->anchor->flags.fixup != kFixupNone); 459 bx_offset = tab_rec->anchor->offset + 4; 460 break; 461 case kX86: 462 bx_offset = 0; 463 break; 464 case kMips: 465 bx_offset = tab_rec->anchor->offset; 466 break; 467 default: LOG(FATAL) << "Unexpected instruction set: " << cu_->instruction_set; 468 } 469 if (cu_->verbose) { 470 LOG(INFO) << "Switch table for offset 0x" << std::hex << bx_offset; 471 } 472 if (tab_rec->table[0] == Instruction::kSparseSwitchSignature) { 473 const int32_t* keys = reinterpret_cast<const int32_t*>(&(tab_rec->table[2])); 474 for (int elems = 0; elems < tab_rec->table[1]; elems++) { 475 int disp = tab_rec->targets[elems]->offset - bx_offset; 476 if (cu_->verbose) { 477 LOG(INFO) << " Case[" << elems << "] key: 0x" 478 << std::hex << keys[elems] << ", disp: 0x" 479 << std::hex << disp; 480 } 481 PushWord(code_buffer_, keys[elems]); 482 PushWord(code_buffer_, 483 tab_rec->targets[elems]->offset - bx_offset); 484 } 485 } else { 486 DCHECK_EQ(static_cast<int>(tab_rec->table[0]), 487 static_cast<int>(Instruction::kPackedSwitchSignature)); 488 for (int elems = 0; elems < tab_rec->table[1]; elems++) { 489 int disp = tab_rec->targets[elems]->offset - bx_offset; 490 if (cu_->verbose) { 491 LOG(INFO) << " Case[" << elems << "] disp: 0x" 492 << std::hex << disp; 493 } 494 PushWord(code_buffer_, tab_rec->targets[elems]->offset - bx_offset); 495 } 496 } 497 } 498} 499 500/* Write the fill array dta to the output stream */ 501void Mir2Lir::InstallFillArrayData() { 502 GrowableArray<FillArrayData*>::Iterator iterator(&fill_array_data_); 503 while (true) { 504 Mir2Lir::FillArrayData *tab_rec = iterator.Next(); 505 if (tab_rec == NULL) break; 506 AlignBuffer(code_buffer_, tab_rec->offset); 507 for (int i = 0; i < (tab_rec->size + 1) / 2; i++) { 508 code_buffer_.push_back(tab_rec->table[i] & 0xFF); 509 code_buffer_.push_back((tab_rec->table[i] >> 8) & 0xFF); 510 } 511 } 512} 513 514static int AssignLiteralOffsetCommon(LIR* lir, CodeOffset offset) { 515 for (; lir != NULL; lir = lir->next) { 516 lir->offset = offset; 517 offset += 4; 518 } 519 return offset; 520} 521 522static int AssignLiteralPointerOffsetCommon(LIR* lir, CodeOffset offset) { 523 unsigned int element_size = sizeof(void*); 524 // Align to natural pointer size. 525 offset = (offset + (element_size - 1)) & ~(element_size - 1); 526 for (; lir != NULL; lir = lir->next) { 527 lir->offset = offset; 528 offset += element_size; 529 } 530 return offset; 531} 532 533// Make sure we have a code address for every declared catch entry 534bool Mir2Lir::VerifyCatchEntries() { 535 MappingTable table(&encoded_mapping_table_[0]); 536 std::vector<uint32_t> dex_pcs; 537 dex_pcs.reserve(table.DexToPcSize()); 538 for (auto it = table.DexToPcBegin(), end = table.DexToPcEnd(); it != end; ++it) { 539 dex_pcs.push_back(it.DexPc()); 540 } 541 // Sort dex_pcs, so that we can quickly check it against the ordered mir_graph_->catches_. 542 std::sort(dex_pcs.begin(), dex_pcs.end()); 543 544 bool success = true; 545 auto it = dex_pcs.begin(), end = dex_pcs.end(); 546 for (uint32_t dex_pc : mir_graph_->catches_) { 547 while (it != end && *it < dex_pc) { 548 LOG(INFO) << "Unexpected catch entry @ dex pc 0x" << std::hex << *it; 549 ++it; 550 success = false; 551 } 552 if (it == end || *it > dex_pc) { 553 LOG(INFO) << "Missing native PC for catch entry @ 0x" << std::hex << dex_pc; 554 success = false; 555 } else { 556 ++it; 557 } 558 } 559 if (!success) { 560 LOG(INFO) << "Bad dex2pcMapping table in " << PrettyMethod(cu_->method_idx, *cu_->dex_file); 561 LOG(INFO) << "Entries @ decode: " << mir_graph_->catches_.size() << ", Entries in table: " 562 << table.DexToPcSize(); 563 } 564 return success; 565} 566 567 568void Mir2Lir::CreateMappingTables() { 569 uint32_t pc2dex_data_size = 0u; 570 uint32_t pc2dex_entries = 0u; 571 uint32_t pc2dex_offset = 0u; 572 uint32_t pc2dex_dalvik_offset = 0u; 573 uint32_t dex2pc_data_size = 0u; 574 uint32_t dex2pc_entries = 0u; 575 uint32_t dex2pc_offset = 0u; 576 uint32_t dex2pc_dalvik_offset = 0u; 577 for (LIR* tgt_lir = first_lir_insn_; tgt_lir != NULL; tgt_lir = NEXT_LIR(tgt_lir)) { 578 if (!tgt_lir->flags.is_nop && (tgt_lir->opcode == kPseudoSafepointPC)) { 579 pc2dex_entries += 1; 580 DCHECK(pc2dex_offset <= tgt_lir->offset); 581 pc2dex_data_size += UnsignedLeb128Size(tgt_lir->offset - pc2dex_offset); 582 pc2dex_data_size += SignedLeb128Size(static_cast<int32_t>(tgt_lir->dalvik_offset) - 583 static_cast<int32_t>(pc2dex_dalvik_offset)); 584 pc2dex_offset = tgt_lir->offset; 585 pc2dex_dalvik_offset = tgt_lir->dalvik_offset; 586 } 587 if (!tgt_lir->flags.is_nop && (tgt_lir->opcode == kPseudoExportedPC)) { 588 dex2pc_entries += 1; 589 DCHECK(dex2pc_offset <= tgt_lir->offset); 590 dex2pc_data_size += UnsignedLeb128Size(tgt_lir->offset - dex2pc_offset); 591 dex2pc_data_size += SignedLeb128Size(static_cast<int32_t>(tgt_lir->dalvik_offset) - 592 static_cast<int32_t>(dex2pc_dalvik_offset)); 593 dex2pc_offset = tgt_lir->offset; 594 dex2pc_dalvik_offset = tgt_lir->dalvik_offset; 595 } 596 } 597 598 uint32_t total_entries = pc2dex_entries + dex2pc_entries; 599 uint32_t hdr_data_size = UnsignedLeb128Size(total_entries) + UnsignedLeb128Size(pc2dex_entries); 600 uint32_t data_size = hdr_data_size + pc2dex_data_size + dex2pc_data_size; 601 encoded_mapping_table_.resize(data_size); 602 uint8_t* write_pos = &encoded_mapping_table_[0]; 603 write_pos = EncodeUnsignedLeb128(write_pos, total_entries); 604 write_pos = EncodeUnsignedLeb128(write_pos, pc2dex_entries); 605 DCHECK_EQ(static_cast<size_t>(write_pos - &encoded_mapping_table_[0]), hdr_data_size); 606 uint8_t* write_pos2 = write_pos + pc2dex_data_size; 607 608 pc2dex_offset = 0u; 609 pc2dex_dalvik_offset = 0u; 610 dex2pc_offset = 0u; 611 dex2pc_dalvik_offset = 0u; 612 for (LIR* tgt_lir = first_lir_insn_; tgt_lir != NULL; tgt_lir = NEXT_LIR(tgt_lir)) { 613 if (!tgt_lir->flags.is_nop && (tgt_lir->opcode == kPseudoSafepointPC)) { 614 DCHECK(pc2dex_offset <= tgt_lir->offset); 615 write_pos = EncodeUnsignedLeb128(write_pos, tgt_lir->offset - pc2dex_offset); 616 write_pos = EncodeSignedLeb128(write_pos, static_cast<int32_t>(tgt_lir->dalvik_offset) - 617 static_cast<int32_t>(pc2dex_dalvik_offset)); 618 pc2dex_offset = tgt_lir->offset; 619 pc2dex_dalvik_offset = tgt_lir->dalvik_offset; 620 } 621 if (!tgt_lir->flags.is_nop && (tgt_lir->opcode == kPseudoExportedPC)) { 622 DCHECK(dex2pc_offset <= tgt_lir->offset); 623 write_pos2 = EncodeUnsignedLeb128(write_pos2, tgt_lir->offset - dex2pc_offset); 624 write_pos2 = EncodeSignedLeb128(write_pos2, static_cast<int32_t>(tgt_lir->dalvik_offset) - 625 static_cast<int32_t>(dex2pc_dalvik_offset)); 626 dex2pc_offset = tgt_lir->offset; 627 dex2pc_dalvik_offset = tgt_lir->dalvik_offset; 628 } 629 } 630 DCHECK_EQ(static_cast<size_t>(write_pos - &encoded_mapping_table_[0]), 631 hdr_data_size + pc2dex_data_size); 632 DCHECK_EQ(static_cast<size_t>(write_pos2 - &encoded_mapping_table_[0]), data_size); 633 634 if (kIsDebugBuild) { 635 CHECK(VerifyCatchEntries()); 636 637 // Verify the encoded table holds the expected data. 638 MappingTable table(&encoded_mapping_table_[0]); 639 CHECK_EQ(table.TotalSize(), total_entries); 640 CHECK_EQ(table.PcToDexSize(), pc2dex_entries); 641 auto it = table.PcToDexBegin(); 642 auto it2 = table.DexToPcBegin(); 643 for (LIR* tgt_lir = first_lir_insn_; tgt_lir != NULL; tgt_lir = NEXT_LIR(tgt_lir)) { 644 if (!tgt_lir->flags.is_nop && (tgt_lir->opcode == kPseudoSafepointPC)) { 645 CHECK_EQ(tgt_lir->offset, it.NativePcOffset()); 646 CHECK_EQ(tgt_lir->dalvik_offset, it.DexPc()); 647 ++it; 648 } 649 if (!tgt_lir->flags.is_nop && (tgt_lir->opcode == kPseudoExportedPC)) { 650 CHECK_EQ(tgt_lir->offset, it2.NativePcOffset()); 651 CHECK_EQ(tgt_lir->dalvik_offset, it2.DexPc()); 652 ++it2; 653 } 654 } 655 CHECK(it == table.PcToDexEnd()); 656 CHECK(it2 == table.DexToPcEnd()); 657 } 658} 659 660class NativePcToReferenceMapBuilder { 661 public: 662 NativePcToReferenceMapBuilder(std::vector<uint8_t>* table, 663 size_t entries, uint32_t max_native_offset, 664 size_t references_width) : entries_(entries), 665 references_width_(references_width), in_use_(entries), 666 table_(table) { 667 // Compute width in bytes needed to hold max_native_offset. 668 native_offset_width_ = 0; 669 while (max_native_offset != 0) { 670 native_offset_width_++; 671 max_native_offset >>= 8; 672 } 673 // Resize table and set up header. 674 table->resize((EntryWidth() * entries) + sizeof(uint32_t)); 675 CHECK_LT(native_offset_width_, 1U << 3); 676 (*table)[0] = native_offset_width_ & 7; 677 CHECK_LT(references_width_, 1U << 13); 678 (*table)[0] |= (references_width_ << 3) & 0xFF; 679 (*table)[1] = (references_width_ >> 5) & 0xFF; 680 CHECK_LT(entries, 1U << 16); 681 (*table)[2] = entries & 0xFF; 682 (*table)[3] = (entries >> 8) & 0xFF; 683 } 684 685 void AddEntry(uint32_t native_offset, const uint8_t* references) { 686 size_t table_index = TableIndex(native_offset); 687 while (in_use_[table_index]) { 688 table_index = (table_index + 1) % entries_; 689 } 690 in_use_[table_index] = true; 691 SetCodeOffset(table_index, native_offset); 692 DCHECK_EQ(native_offset, GetCodeOffset(table_index)); 693 SetReferences(table_index, references); 694 } 695 696 private: 697 size_t TableIndex(uint32_t native_offset) { 698 return NativePcOffsetToReferenceMap::Hash(native_offset) % entries_; 699 } 700 701 uint32_t GetCodeOffset(size_t table_index) { 702 uint32_t native_offset = 0; 703 size_t table_offset = (table_index * EntryWidth()) + sizeof(uint32_t); 704 for (size_t i = 0; i < native_offset_width_; i++) { 705 native_offset |= (*table_)[table_offset + i] << (i * 8); 706 } 707 return native_offset; 708 } 709 710 void SetCodeOffset(size_t table_index, uint32_t native_offset) { 711 size_t table_offset = (table_index * EntryWidth()) + sizeof(uint32_t); 712 for (size_t i = 0; i < native_offset_width_; i++) { 713 (*table_)[table_offset + i] = (native_offset >> (i * 8)) & 0xFF; 714 } 715 } 716 717 void SetReferences(size_t table_index, const uint8_t* references) { 718 size_t table_offset = (table_index * EntryWidth()) + sizeof(uint32_t); 719 memcpy(&(*table_)[table_offset + native_offset_width_], references, references_width_); 720 } 721 722 size_t EntryWidth() const { 723 return native_offset_width_ + references_width_; 724 } 725 726 // Number of entries in the table. 727 const size_t entries_; 728 // Number of bytes used to encode the reference bitmap. 729 const size_t references_width_; 730 // Number of bytes used to encode a native offset. 731 size_t native_offset_width_; 732 // Entries that are in use. 733 std::vector<bool> in_use_; 734 // The table we're building. 735 std::vector<uint8_t>* const table_; 736}; 737 738void Mir2Lir::CreateNativeGcMap() { 739 DCHECK(!encoded_mapping_table_.empty()); 740 MappingTable mapping_table(&encoded_mapping_table_[0]); 741 uint32_t max_native_offset = 0; 742 for (auto it = mapping_table.PcToDexBegin(), end = mapping_table.PcToDexEnd(); it != end; ++it) { 743 uint32_t native_offset = it.NativePcOffset(); 744 if (native_offset > max_native_offset) { 745 max_native_offset = native_offset; 746 } 747 } 748 MethodReference method_ref(cu_->dex_file, cu_->method_idx); 749 const std::vector<uint8_t>* gc_map_raw = verifier::MethodVerifier::GetDexGcMap(method_ref); 750 verifier::DexPcToReferenceMap dex_gc_map(&(*gc_map_raw)[4], gc_map_raw->size() - 4); 751 // Compute native offset to references size. 752 NativePcToReferenceMapBuilder native_gc_map_builder(&native_gc_map_, 753 mapping_table.PcToDexSize(), 754 max_native_offset, dex_gc_map.RegWidth()); 755 756 for (auto it = mapping_table.PcToDexBegin(), end = mapping_table.PcToDexEnd(); it != end; ++it) { 757 uint32_t native_offset = it.NativePcOffset(); 758 uint32_t dex_pc = it.DexPc(); 759 const uint8_t* references = dex_gc_map.FindBitMap(dex_pc, false); 760 CHECK(references != NULL) << "Missing ref for dex pc 0x" << std::hex << dex_pc; 761 native_gc_map_builder.AddEntry(native_offset, references); 762 } 763} 764 765/* Determine the offset of each literal field */ 766int Mir2Lir::AssignLiteralOffset(CodeOffset offset) { 767 offset = AssignLiteralOffsetCommon(literal_list_, offset); 768 offset = AssignLiteralPointerOffsetCommon(code_literal_list_, offset); 769 offset = AssignLiteralPointerOffsetCommon(method_literal_list_, offset); 770 return offset; 771} 772 773int Mir2Lir::AssignSwitchTablesOffset(CodeOffset offset) { 774 GrowableArray<SwitchTable*>::Iterator iterator(&switch_tables_); 775 while (true) { 776 Mir2Lir::SwitchTable* tab_rec = iterator.Next(); 777 if (tab_rec == NULL) break; 778 tab_rec->offset = offset; 779 if (tab_rec->table[0] == Instruction::kSparseSwitchSignature) { 780 offset += tab_rec->table[1] * (sizeof(int) * 2); 781 } else { 782 DCHECK_EQ(static_cast<int>(tab_rec->table[0]), 783 static_cast<int>(Instruction::kPackedSwitchSignature)); 784 offset += tab_rec->table[1] * sizeof(int); 785 } 786 } 787 return offset; 788} 789 790int Mir2Lir::AssignFillArrayDataOffset(CodeOffset offset) { 791 GrowableArray<FillArrayData*>::Iterator iterator(&fill_array_data_); 792 while (true) { 793 Mir2Lir::FillArrayData *tab_rec = iterator.Next(); 794 if (tab_rec == NULL) break; 795 tab_rec->offset = offset; 796 offset += tab_rec->size; 797 // word align 798 offset = (offset + 3) & ~3; 799 } 800 return offset; 801} 802 803/* 804 * Insert a kPseudoCaseLabel at the beginning of the Dalvik 805 * offset vaddr if pretty-printing, otherise use the standard block 806 * label. The selected label will be used to fix up the case 807 * branch table during the assembly phase. All resource flags 808 * are set to prevent code motion. KeyVal is just there for debugging. 809 */ 810LIR* Mir2Lir::InsertCaseLabel(DexOffset vaddr, int keyVal) { 811 LIR* boundary_lir = &block_label_list_[mir_graph_->FindBlock(vaddr)->id]; 812 LIR* res = boundary_lir; 813 if (cu_->verbose) { 814 // Only pay the expense if we're pretty-printing. 815 LIR* new_label = static_cast<LIR*>(arena_->Alloc(sizeof(LIR), ArenaAllocator::kAllocLIR)); 816 new_label->dalvik_offset = vaddr; 817 new_label->opcode = kPseudoCaseLabel; 818 new_label->operands[0] = keyVal; 819 new_label->flags.fixup = kFixupLabel; 820 DCHECK(!new_label->flags.use_def_invalid); 821 new_label->u.m.def_mask = ENCODE_ALL; 822 InsertLIRAfter(boundary_lir, new_label); 823 res = new_label; 824 } 825 return res; 826} 827 828void Mir2Lir::MarkPackedCaseLabels(Mir2Lir::SwitchTable* tab_rec) { 829 const uint16_t* table = tab_rec->table; 830 DexOffset base_vaddr = tab_rec->vaddr; 831 const int32_t *targets = reinterpret_cast<const int32_t*>(&table[4]); 832 int entries = table[1]; 833 int low_key = s4FromSwitchData(&table[2]); 834 for (int i = 0; i < entries; i++) { 835 tab_rec->targets[i] = InsertCaseLabel(base_vaddr + targets[i], i + low_key); 836 } 837} 838 839void Mir2Lir::MarkSparseCaseLabels(Mir2Lir::SwitchTable* tab_rec) { 840 const uint16_t* table = tab_rec->table; 841 DexOffset base_vaddr = tab_rec->vaddr; 842 int entries = table[1]; 843 const int32_t* keys = reinterpret_cast<const int32_t*>(&table[2]); 844 const int32_t* targets = &keys[entries]; 845 for (int i = 0; i < entries; i++) { 846 tab_rec->targets[i] = InsertCaseLabel(base_vaddr + targets[i], keys[i]); 847 } 848} 849 850void Mir2Lir::ProcessSwitchTables() { 851 GrowableArray<SwitchTable*>::Iterator iterator(&switch_tables_); 852 while (true) { 853 Mir2Lir::SwitchTable *tab_rec = iterator.Next(); 854 if (tab_rec == NULL) break; 855 if (tab_rec->table[0] == Instruction::kPackedSwitchSignature) { 856 MarkPackedCaseLabels(tab_rec); 857 } else if (tab_rec->table[0] == Instruction::kSparseSwitchSignature) { 858 MarkSparseCaseLabels(tab_rec); 859 } else { 860 LOG(FATAL) << "Invalid switch table"; 861 } 862 } 863} 864 865void Mir2Lir::DumpSparseSwitchTable(const uint16_t* table) { 866 /* 867 * Sparse switch data format: 868 * ushort ident = 0x0200 magic value 869 * ushort size number of entries in the table; > 0 870 * int keys[size] keys, sorted low-to-high; 32-bit aligned 871 * int targets[size] branch targets, relative to switch opcode 872 * 873 * Total size is (2+size*4) 16-bit code units. 874 */ 875 uint16_t ident = table[0]; 876 int entries = table[1]; 877 const int32_t* keys = reinterpret_cast<const int32_t*>(&table[2]); 878 const int32_t* targets = &keys[entries]; 879 LOG(INFO) << "Sparse switch table - ident:0x" << std::hex << ident 880 << ", entries: " << std::dec << entries; 881 for (int i = 0; i < entries; i++) { 882 LOG(INFO) << " Key[" << keys[i] << "] -> 0x" << std::hex << targets[i]; 883 } 884} 885 886void Mir2Lir::DumpPackedSwitchTable(const uint16_t* table) { 887 /* 888 * Packed switch data format: 889 * ushort ident = 0x0100 magic value 890 * ushort size number of entries in the table 891 * int first_key first (and lowest) switch case value 892 * int targets[size] branch targets, relative to switch opcode 893 * 894 * Total size is (4+size*2) 16-bit code units. 895 */ 896 uint16_t ident = table[0]; 897 const int32_t* targets = reinterpret_cast<const int32_t*>(&table[4]); 898 int entries = table[1]; 899 int low_key = s4FromSwitchData(&table[2]); 900 LOG(INFO) << "Packed switch table - ident:0x" << std::hex << ident 901 << ", entries: " << std::dec << entries << ", low_key: " << low_key; 902 for (int i = 0; i < entries; i++) { 903 LOG(INFO) << " Key[" << (i + low_key) << "] -> 0x" << std::hex 904 << targets[i]; 905 } 906} 907 908/* Set up special LIR to mark a Dalvik byte-code instruction start for pretty printing */ 909void Mir2Lir::MarkBoundary(DexOffset offset, const char* inst_str) { 910 // NOTE: only used for debug listings. 911 NewLIR1(kPseudoDalvikByteCodeBoundary, WrapPointer(ArenaStrdup(inst_str))); 912} 913 914bool Mir2Lir::EvaluateBranch(Instruction::Code opcode, int32_t src1, int32_t src2) { 915 bool is_taken; 916 switch (opcode) { 917 case Instruction::IF_EQ: is_taken = (src1 == src2); break; 918 case Instruction::IF_NE: is_taken = (src1 != src2); break; 919 case Instruction::IF_LT: is_taken = (src1 < src2); break; 920 case Instruction::IF_GE: is_taken = (src1 >= src2); break; 921 case Instruction::IF_GT: is_taken = (src1 > src2); break; 922 case Instruction::IF_LE: is_taken = (src1 <= src2); break; 923 case Instruction::IF_EQZ: is_taken = (src1 == 0); break; 924 case Instruction::IF_NEZ: is_taken = (src1 != 0); break; 925 case Instruction::IF_LTZ: is_taken = (src1 < 0); break; 926 case Instruction::IF_GEZ: is_taken = (src1 >= 0); break; 927 case Instruction::IF_GTZ: is_taken = (src1 > 0); break; 928 case Instruction::IF_LEZ: is_taken = (src1 <= 0); break; 929 default: 930 LOG(FATAL) << "Unexpected opcode " << opcode; 931 is_taken = false; 932 } 933 return is_taken; 934} 935 936// Convert relation of src1/src2 to src2/src1 937ConditionCode Mir2Lir::FlipComparisonOrder(ConditionCode before) { 938 ConditionCode res; 939 switch (before) { 940 case kCondEq: res = kCondEq; break; 941 case kCondNe: res = kCondNe; break; 942 case kCondLt: res = kCondGt; break; 943 case kCondGt: res = kCondLt; break; 944 case kCondLe: res = kCondGe; break; 945 case kCondGe: res = kCondLe; break; 946 default: 947 res = static_cast<ConditionCode>(0); 948 LOG(FATAL) << "Unexpected ccode " << before; 949 } 950 return res; 951} 952 953// TODO: move to mir_to_lir.cc 954Mir2Lir::Mir2Lir(CompilationUnit* cu, MIRGraph* mir_graph, ArenaAllocator* arena) 955 : Backend(arena), 956 literal_list_(NULL), 957 method_literal_list_(NULL), 958 code_literal_list_(NULL), 959 first_fixup_(NULL), 960 cu_(cu), 961 mir_graph_(mir_graph), 962 switch_tables_(arena, 4, kGrowableArraySwitchTables), 963 fill_array_data_(arena, 4, kGrowableArrayFillArrayData), 964 throw_launchpads_(arena, 2048, kGrowableArrayThrowLaunchPads), 965 suspend_launchpads_(arena, 4, kGrowableArraySuspendLaunchPads), 966 intrinsic_launchpads_(arena, 2048, kGrowableArrayMisc), 967 tempreg_info_(arena, 20, kGrowableArrayMisc), 968 reginfo_map_(arena, 64, kGrowableArrayMisc), 969 pointer_storage_(arena, 128, kGrowableArrayMisc), 970 data_offset_(0), 971 total_size_(0), 972 block_label_list_(NULL), 973 current_dalvik_offset_(0), 974 estimated_native_code_size_(0), 975 reg_pool_(NULL), 976 live_sreg_(0), 977 num_core_spills_(0), 978 num_fp_spills_(0), 979 frame_size_(0), 980 core_spill_mask_(0), 981 fp_spill_mask_(0), 982 first_lir_insn_(NULL), 983 last_lir_insn_(NULL), 984 inliner_(nullptr) { 985 promotion_map_ = static_cast<PromotionMap*> 986 (arena_->Alloc((cu_->num_dalvik_registers + cu_->num_compiler_temps + 1) * 987 sizeof(promotion_map_[0]), ArenaAllocator::kAllocRegAlloc)); 988 // Reserve pointer id 0 for NULL. 989 size_t null_idx = WrapPointer(NULL); 990 DCHECK_EQ(null_idx, 0U); 991} 992 993void Mir2Lir::Materialize() { 994 cu_->NewTimingSplit("RegisterAllocation"); 995 CompilerInitializeRegAlloc(); // Needs to happen after SSA naming 996 997 /* Allocate Registers using simple local allocation scheme */ 998 SimpleRegAlloc(); 999 1000 if (mir_graph_->IsSpecialCase()) { 1001 /* 1002 * Custom codegen for special cases. If for any reason the 1003 * special codegen doesn't succeed, first_lir_insn_ will 1004 * set to NULL; 1005 */ 1006 cu_->NewTimingSplit("SpecialMIR2LIR"); 1007 SpecialMIR2LIR(mir_graph_->GetSpecialCase()); 1008 } 1009 1010 /* Convert MIR to LIR, etc. */ 1011 if (first_lir_insn_ == NULL) { 1012 MethodMIR2LIR(); 1013 } 1014 1015 /* Method is not empty */ 1016 if (first_lir_insn_) { 1017 // mark the targets of switch statement case labels 1018 ProcessSwitchTables(); 1019 1020 /* Convert LIR into machine code. */ 1021 AssembleLIR(); 1022 1023 if (cu_->verbose) { 1024 CodegenDump(); 1025 } 1026 } 1027} 1028 1029CompiledMethod* Mir2Lir::GetCompiledMethod() { 1030 // Combine vmap tables - core regs, then fp regs - into vmap_table 1031 std::vector<uint16_t> raw_vmap_table; 1032 // Core regs may have been inserted out of order - sort first 1033 std::sort(core_vmap_table_.begin(), core_vmap_table_.end()); 1034 for (size_t i = 0 ; i < core_vmap_table_.size(); ++i) { 1035 // Copy, stripping out the phys register sort key 1036 raw_vmap_table.push_back(~(-1 << VREG_NUM_WIDTH) & core_vmap_table_[i]); 1037 } 1038 // If we have a frame, push a marker to take place of lr 1039 if (frame_size_ > 0) { 1040 raw_vmap_table.push_back(INVALID_VREG); 1041 } else { 1042 DCHECK_EQ(__builtin_popcount(core_spill_mask_), 0); 1043 DCHECK_EQ(__builtin_popcount(fp_spill_mask_), 0); 1044 } 1045 // Combine vmap tables - core regs, then fp regs. fp regs already sorted 1046 for (uint32_t i = 0; i < fp_vmap_table_.size(); i++) { 1047 raw_vmap_table.push_back(fp_vmap_table_[i]); 1048 } 1049 Leb128EncodingVector vmap_encoder; 1050 // Prefix the encoded data with its size. 1051 vmap_encoder.PushBackUnsigned(raw_vmap_table.size()); 1052 for (uint16_t cur : raw_vmap_table) { 1053 vmap_encoder.PushBackUnsigned(cur); 1054 } 1055 CompiledMethod* result = 1056 new CompiledMethod(*cu_->compiler_driver, cu_->instruction_set, code_buffer_, frame_size_, 1057 core_spill_mask_, fp_spill_mask_, encoded_mapping_table_, 1058 vmap_encoder.GetData(), native_gc_map_); 1059 return result; 1060} 1061 1062int Mir2Lir::ComputeFrameSize() { 1063 /* Figure out the frame size */ 1064 static const uint32_t kAlignMask = kStackAlignment - 1; 1065 uint32_t size = (num_core_spills_ + num_fp_spills_ + 1066 1 /* filler word */ + cu_->num_regs + cu_->num_outs + 1067 cu_->num_compiler_temps + 1 /* cur_method* */) 1068 * sizeof(uint32_t); 1069 /* Align and set */ 1070 return (size + kAlignMask) & ~(kAlignMask); 1071} 1072 1073/* 1074 * Append an LIR instruction to the LIR list maintained by a compilation 1075 * unit 1076 */ 1077void Mir2Lir::AppendLIR(LIR* lir) { 1078 if (first_lir_insn_ == NULL) { 1079 DCHECK(last_lir_insn_ == NULL); 1080 last_lir_insn_ = first_lir_insn_ = lir; 1081 lir->prev = lir->next = NULL; 1082 } else { 1083 last_lir_insn_->next = lir; 1084 lir->prev = last_lir_insn_; 1085 lir->next = NULL; 1086 last_lir_insn_ = lir; 1087 } 1088} 1089 1090/* 1091 * Insert an LIR instruction before the current instruction, which cannot be the 1092 * first instruction. 1093 * 1094 * prev_lir <-> new_lir <-> current_lir 1095 */ 1096void Mir2Lir::InsertLIRBefore(LIR* current_lir, LIR* new_lir) { 1097 DCHECK(current_lir->prev != NULL); 1098 LIR *prev_lir = current_lir->prev; 1099 1100 prev_lir->next = new_lir; 1101 new_lir->prev = prev_lir; 1102 new_lir->next = current_lir; 1103 current_lir->prev = new_lir; 1104} 1105 1106/* 1107 * Insert an LIR instruction after the current instruction, which cannot be the 1108 * first instruction. 1109 * 1110 * current_lir -> new_lir -> old_next 1111 */ 1112void Mir2Lir::InsertLIRAfter(LIR* current_lir, LIR* new_lir) { 1113 new_lir->prev = current_lir; 1114 new_lir->next = current_lir->next; 1115 current_lir->next = new_lir; 1116 new_lir->next->prev = new_lir; 1117} 1118 1119} // namespace art 1120