CodeGenInstruction.cpp revision a49c7dfb360154070c08b8eb94ad31711d1babae
1//===- CodeGenInstruction.cpp - CodeGen Instruction Class Wrapper ---------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the CodeGenInstruction class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "CodeGenInstruction.h" 15#include "CodeGenTarget.h" 16#include "Record.h" 17#include "llvm/ADT/StringExtras.h" 18#include "llvm/ADT/StringMap.h" 19#include "llvm/ADT/STLExtras.h" 20#include <set> 21using namespace llvm; 22 23//===----------------------------------------------------------------------===// 24// CGIOperandList Implementation 25//===----------------------------------------------------------------------===// 26 27CGIOperandList::CGIOperandList(Record *R) : TheDef(R) { 28 isPredicable = false; 29 hasOptionalDef = false; 30 isVariadic = false; 31 32 DagInit *OutDI = R->getValueAsDag("OutOperandList"); 33 34 if (DefInit *Init = dynamic_cast<DefInit*>(OutDI->getOperator())) { 35 if (Init->getDef()->getName() != "outs") 36 throw R->getName() + ": invalid def name for output list: use 'outs'"; 37 } else 38 throw R->getName() + ": invalid output list: use 'outs'"; 39 40 NumDefs = OutDI->getNumArgs(); 41 42 DagInit *InDI = R->getValueAsDag("InOperandList"); 43 if (DefInit *Init = dynamic_cast<DefInit*>(InDI->getOperator())) { 44 if (Init->getDef()->getName() != "ins") 45 throw R->getName() + ": invalid def name for input list: use 'ins'"; 46 } else 47 throw R->getName() + ": invalid input list: use 'ins'"; 48 49 unsigned MIOperandNo = 0; 50 std::set<std::string> OperandNames; 51 for (unsigned i = 0, e = InDI->getNumArgs()+OutDI->getNumArgs(); i != e; ++i){ 52 Init *ArgInit; 53 std::string ArgName; 54 if (i < NumDefs) { 55 ArgInit = OutDI->getArg(i); 56 ArgName = OutDI->getArgName(i); 57 } else { 58 ArgInit = InDI->getArg(i-NumDefs); 59 ArgName = InDI->getArgName(i-NumDefs); 60 } 61 62 DefInit *Arg = dynamic_cast<DefInit*>(ArgInit); 63 if (!Arg) 64 throw "Illegal operand for the '" + R->getName() + "' instruction!"; 65 66 Record *Rec = Arg->getDef(); 67 std::string PrintMethod = "printOperand"; 68 std::string EncoderMethod; 69 unsigned NumOps = 1; 70 DagInit *MIOpInfo = 0; 71 if (Rec->isSubClassOf("Operand")) { 72 PrintMethod = Rec->getValueAsString("PrintMethod"); 73 // If there is an explicit encoder method, use it. 74 EncoderMethod = Rec->getValueAsString("EncoderMethod"); 75 MIOpInfo = Rec->getValueAsDag("MIOperandInfo"); 76 77 // Verify that MIOpInfo has an 'ops' root value. 78 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) || 79 dynamic_cast<DefInit*>(MIOpInfo->getOperator()) 80 ->getDef()->getName() != "ops") 81 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() + 82 "'\n"; 83 84 // If we have MIOpInfo, then we have #operands equal to number of entries 85 // in MIOperandInfo. 86 if (unsigned NumArgs = MIOpInfo->getNumArgs()) 87 NumOps = NumArgs; 88 89 if (Rec->isSubClassOf("PredicateOperand")) 90 isPredicable = true; 91 else if (Rec->isSubClassOf("OptionalDefOperand")) 92 hasOptionalDef = true; 93 } else if (Rec->getName() == "variable_ops") { 94 isVariadic = true; 95 continue; 96 } else if (!Rec->isSubClassOf("RegisterClass") && 97 !Rec->isSubClassOf("PointerLikeRegClass") && 98 Rec->getName() != "unknown") 99 throw "Unknown operand class '" + Rec->getName() + 100 "' in '" + R->getName() + "' instruction!"; 101 102 // Check that the operand has a name and that it's unique. 103 if (ArgName.empty()) 104 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 105 " has no name!"; 106 if (!OperandNames.insert(ArgName).second) 107 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 108 " has the same name as a previous operand!"; 109 110 OperandList.push_back(OperandInfo(Rec, ArgName, PrintMethod, EncoderMethod, 111 MIOperandNo, NumOps, MIOpInfo)); 112 MIOperandNo += NumOps; 113 } 114 115 116 // Make sure the constraints list for each operand is large enough to hold 117 // constraint info, even if none is present. 118 for (unsigned i = 0, e = OperandList.size(); i != e; ++i) 119 OperandList[i].Constraints.resize(OperandList[i].MINumOperands); 120} 121 122 123/// getOperandNamed - Return the index of the operand with the specified 124/// non-empty name. If the instruction does not have an operand with the 125/// specified name, throw an exception. 126/// 127unsigned CGIOperandList::getOperandNamed(StringRef Name) const { 128 unsigned OpIdx; 129 if (hasOperandNamed(Name, OpIdx)) return OpIdx; 130 throw "'" + TheDef->getName() + "' does not have an operand named '$" + 131 Name.str() + "'!"; 132} 133 134/// hasOperandNamed - Query whether the instruction has an operand of the 135/// given name. If so, return true and set OpIdx to the index of the 136/// operand. Otherwise, return false. 137bool CGIOperandList::hasOperandNamed(StringRef Name, unsigned &OpIdx) const { 138 assert(!Name.empty() && "Cannot search for operand with no name!"); 139 for (unsigned i = 0, e = OperandList.size(); i != e; ++i) 140 if (OperandList[i].Name == Name) { 141 OpIdx = i; 142 return true; 143 } 144 return false; 145} 146 147std::pair<unsigned,unsigned> 148CGIOperandList::ParseOperandName(const std::string &Op, bool AllowWholeOp) { 149 if (Op.empty() || Op[0] != '$') 150 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'"; 151 152 std::string OpName = Op.substr(1); 153 std::string SubOpName; 154 155 // Check to see if this is $foo.bar. 156 std::string::size_type DotIdx = OpName.find_first_of("."); 157 if (DotIdx != std::string::npos) { 158 SubOpName = OpName.substr(DotIdx+1); 159 if (SubOpName.empty()) 160 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'"; 161 OpName = OpName.substr(0, DotIdx); 162 } 163 164 unsigned OpIdx = getOperandNamed(OpName); 165 166 if (SubOpName.empty()) { // If no suboperand name was specified: 167 // If one was needed, throw. 168 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp && 169 SubOpName.empty()) 170 throw TheDef->getName() + ": Illegal to refer to" 171 " whole operand part of complex operand '" + Op + "'"; 172 173 // Otherwise, return the operand. 174 return std::make_pair(OpIdx, 0U); 175 } 176 177 // Find the suboperand number involved. 178 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo; 179 if (MIOpInfo == 0) 180 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 181 182 // Find the operand with the right name. 183 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i) 184 if (MIOpInfo->getArgName(i) == SubOpName) 185 return std::make_pair(OpIdx, i); 186 187 // Otherwise, didn't find it! 188 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 189} 190 191static void ParseConstraint(const std::string &CStr, CGIOperandList &Ops) { 192 // EARLY_CLOBBER: @early $reg 193 std::string::size_type wpos = CStr.find_first_of(" \t"); 194 std::string::size_type start = CStr.find_first_not_of(" \t"); 195 std::string Tok = CStr.substr(start, wpos - start); 196 if (Tok == "@earlyclobber") { 197 std::string Name = CStr.substr(wpos+1); 198 wpos = Name.find_first_not_of(" \t"); 199 if (wpos == std::string::npos) 200 throw "Illegal format for @earlyclobber constraint: '" + CStr + "'"; 201 Name = Name.substr(wpos); 202 std::pair<unsigned,unsigned> Op = Ops.ParseOperandName(Name, false); 203 204 // Build the string for the operand 205 if (!Ops[Op.first].Constraints[Op.second].isNone()) 206 throw "Operand '" + Name + "' cannot have multiple constraints!"; 207 Ops[Op.first].Constraints[Op.second] = 208 CGIOperandList::ConstraintInfo::getEarlyClobber(); 209 return; 210 } 211 212 // Only other constraint is "TIED_TO" for now. 213 std::string::size_type pos = CStr.find_first_of('='); 214 assert(pos != std::string::npos && "Unrecognized constraint"); 215 start = CStr.find_first_not_of(" \t"); 216 std::string Name = CStr.substr(start, pos - start); 217 218 // TIED_TO: $src1 = $dst 219 wpos = Name.find_first_of(" \t"); 220 if (wpos == std::string::npos) 221 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 222 std::string DestOpName = Name.substr(0, wpos); 223 std::pair<unsigned,unsigned> DestOp = Ops.ParseOperandName(DestOpName, false); 224 225 Name = CStr.substr(pos+1); 226 wpos = Name.find_first_not_of(" \t"); 227 if (wpos == std::string::npos) 228 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 229 230 std::pair<unsigned,unsigned> SrcOp = 231 Ops.ParseOperandName(Name.substr(wpos), false); 232 if (SrcOp > DestOp) 233 throw "Illegal tied-to operand constraint '" + CStr + "'"; 234 235 236 unsigned FlatOpNo = Ops.getFlattenedOperandNumber(SrcOp); 237 238 if (!Ops[DestOp.first].Constraints[DestOp.second].isNone()) 239 throw "Operand '" + DestOpName + "' cannot have multiple constraints!"; 240 Ops[DestOp.first].Constraints[DestOp.second] = 241 CGIOperandList::ConstraintInfo::getTied(FlatOpNo); 242} 243 244static void ParseConstraints(const std::string &CStr, CGIOperandList &Ops) { 245 if (CStr.empty()) return; 246 247 const std::string delims(","); 248 std::string::size_type bidx, eidx; 249 250 bidx = CStr.find_first_not_of(delims); 251 while (bidx != std::string::npos) { 252 eidx = CStr.find_first_of(delims, bidx); 253 if (eidx == std::string::npos) 254 eidx = CStr.length(); 255 256 ParseConstraint(CStr.substr(bidx, eidx - bidx), Ops); 257 bidx = CStr.find_first_not_of(delims, eidx); 258 } 259} 260 261void CGIOperandList::ProcessDisableEncoding(std::string DisableEncoding) { 262 while (1) { 263 std::string OpName; 264 tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t"); 265 if (OpName.empty()) break; 266 267 // Figure out which operand this is. 268 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false); 269 270 // Mark the operand as not-to-be encoded. 271 if (Op.second >= OperandList[Op.first].DoNotEncode.size()) 272 OperandList[Op.first].DoNotEncode.resize(Op.second+1); 273 OperandList[Op.first].DoNotEncode[Op.second] = true; 274 } 275 276} 277 278//===----------------------------------------------------------------------===// 279// CodeGenInstruction Implementation 280//===----------------------------------------------------------------------===// 281 282CodeGenInstruction::CodeGenInstruction(Record *R) : TheDef(R), Operands(R) { 283 Namespace = R->getValueAsString("Namespace"); 284 AsmString = R->getValueAsString("AsmString"); 285 286 isReturn = R->getValueAsBit("isReturn"); 287 isBranch = R->getValueAsBit("isBranch"); 288 isIndirectBranch = R->getValueAsBit("isIndirectBranch"); 289 isCompare = R->getValueAsBit("isCompare"); 290 isMoveImm = R->getValueAsBit("isMoveImm"); 291 isBarrier = R->getValueAsBit("isBarrier"); 292 isCall = R->getValueAsBit("isCall"); 293 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); 294 mayLoad = R->getValueAsBit("mayLoad"); 295 mayStore = R->getValueAsBit("mayStore"); 296 isPredicable = Operands.isPredicable || R->getValueAsBit("isPredicable"); 297 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress"); 298 isCommutable = R->getValueAsBit("isCommutable"); 299 isTerminator = R->getValueAsBit("isTerminator"); 300 isReMaterializable = R->getValueAsBit("isReMaterializable"); 301 hasDelaySlot = R->getValueAsBit("hasDelaySlot"); 302 usesCustomInserter = R->getValueAsBit("usesCustomInserter"); 303 hasCtrlDep = R->getValueAsBit("hasCtrlDep"); 304 isNotDuplicable = R->getValueAsBit("isNotDuplicable"); 305 hasSideEffects = R->getValueAsBit("hasSideEffects"); 306 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects"); 307 isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove"); 308 hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq"); 309 hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq"); 310 ImplicitDefs = R->getValueAsListOfDefs("Defs"); 311 ImplicitUses = R->getValueAsListOfDefs("Uses"); 312 313 if (neverHasSideEffects + hasSideEffects > 1) 314 throw R->getName() + ": multiple conflicting side-effect flags set!"; 315 316 // Parse Constraints. 317 ParseConstraints(R->getValueAsString("Constraints"), Operands); 318 319 // Parse the DisableEncoding field. 320 Operands.ProcessDisableEncoding(R->getValueAsString("DisableEncoding")); 321} 322 323/// HasOneImplicitDefWithKnownVT - If the instruction has at least one 324/// implicit def and it has a known VT, return the VT, otherwise return 325/// MVT::Other. 326MVT::SimpleValueType CodeGenInstruction:: 327HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const { 328 if (ImplicitDefs.empty()) return MVT::Other; 329 330 // Check to see if the first implicit def has a resolvable type. 331 Record *FirstImplicitDef = ImplicitDefs[0]; 332 assert(FirstImplicitDef->isSubClassOf("Register")); 333 const std::vector<MVT::SimpleValueType> &RegVTs = 334 TargetInfo.getRegisterVTs(FirstImplicitDef); 335 if (RegVTs.size() == 1) 336 return RegVTs[0]; 337 return MVT::Other; 338} 339 340 341/// FlattenAsmStringVariants - Flatten the specified AsmString to only 342/// include text from the specified variant, returning the new string. 343std::string CodeGenInstruction:: 344FlattenAsmStringVariants(StringRef Cur, unsigned Variant) { 345 std::string Res = ""; 346 347 for (;;) { 348 // Find the start of the next variant string. 349 size_t VariantsStart = 0; 350 for (size_t e = Cur.size(); VariantsStart != e; ++VariantsStart) 351 if (Cur[VariantsStart] == '{' && 352 (VariantsStart == 0 || (Cur[VariantsStart-1] != '$' && 353 Cur[VariantsStart-1] != '\\'))) 354 break; 355 356 // Add the prefix to the result. 357 Res += Cur.slice(0, VariantsStart); 358 if (VariantsStart == Cur.size()) 359 break; 360 361 ++VariantsStart; // Skip the '{'. 362 363 // Scan to the end of the variants string. 364 size_t VariantsEnd = VariantsStart; 365 unsigned NestedBraces = 1; 366 for (size_t e = Cur.size(); VariantsEnd != e; ++VariantsEnd) { 367 if (Cur[VariantsEnd] == '}' && Cur[VariantsEnd-1] != '\\') { 368 if (--NestedBraces == 0) 369 break; 370 } else if (Cur[VariantsEnd] == '{') 371 ++NestedBraces; 372 } 373 374 // Select the Nth variant (or empty). 375 StringRef Selection = Cur.slice(VariantsStart, VariantsEnd); 376 for (unsigned i = 0; i != Variant; ++i) 377 Selection = Selection.split('|').second; 378 Res += Selection.split('|').first; 379 380 assert(VariantsEnd != Cur.size() && 381 "Unterminated variants in assembly string!"); 382 Cur = Cur.substr(VariantsEnd + 1); 383 } 384 385 return Res; 386} 387 388 389//===----------------------------------------------------------------------===// 390/// CodeGenInstAlias Implementation 391//===----------------------------------------------------------------------===// 392 393/// tryAliasOpMatch - This is a helper function for the CodeGenInstAlias 394/// constructor. It checks if an argument in an InstAlias pattern matches 395/// the corresponding operand of the instruction. It returns true on a 396/// successful match, with ResOp set to the result operand to be used. 397bool CodeGenInstAlias::tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo, 398 Record *InstOpRec, bool hasSubOps, 399 SMLoc Loc, CodeGenTarget &T, 400 ResultOperand &ResOp) { 401 Init *Arg = Result->getArg(AliasOpNo); 402 DefInit *ADI = dynamic_cast<DefInit*>(Arg); 403 404 if (ADI && ADI->getDef() == InstOpRec) { 405 // If the operand is a record, it must have a name, and the record type 406 // must match up with the instruction's argument type. 407 if (Result->getArgName(AliasOpNo).empty()) 408 throw TGError(Loc, "result argument #" + utostr(AliasOpNo) + 409 " must have a name!"); 410 ResOp = ResultOperand(Result->getArgName(AliasOpNo), ADI->getDef()); 411 return true; 412 } 413 414 // Handle explicit registers. 415 if (ADI && ADI->getDef()->isSubClassOf("Register")) { 416 if (!InstOpRec->isSubClassOf("RegisterClass")) 417 return false; 418 419 if (!T.getRegisterClass(InstOpRec).containsRegister(ADI->getDef())) 420 throw TGError(Loc, "fixed register " +ADI->getDef()->getName() 421 + " is not a member of the " + InstOpRec->getName() + 422 " register class!"); 423 424 if (!Result->getArgName(AliasOpNo).empty()) 425 throw TGError(Loc, "result fixed register argument must " 426 "not have a name!"); 427 428 ResOp = ResultOperand(ADI->getDef()); 429 return true; 430 } 431 432 // Handle "zero_reg" for optional def operands. 433 if (ADI && ADI->getDef()->getName() == "zero_reg") { 434 435 // Check if this is an optional def. 436 if (!InstOpRec->isSubClassOf("OptionalDefOperand")) 437 throw TGError(Loc, "reg0 used for result that is not an " 438 "OptionalDefOperand!"); 439 440 ResOp = ResultOperand(static_cast<Record*>(0)); 441 return true; 442 } 443 444 if (IntInit *II = dynamic_cast<IntInit*>(Arg)) { 445 if (hasSubOps || !InstOpRec->isSubClassOf("Operand")) 446 return false; 447 // Integer arguments can't have names. 448 if (!Result->getArgName(AliasOpNo).empty()) 449 throw TGError(Loc, "result argument #" + utostr(AliasOpNo) + 450 " must not have a name!"); 451 ResOp = ResultOperand(II->getValue()); 452 return true; 453 } 454 455 return false; 456} 457 458CodeGenInstAlias::CodeGenInstAlias(Record *R, CodeGenTarget &T) : TheDef(R) { 459 AsmString = R->getValueAsString("AsmString"); 460 Result = R->getValueAsDag("ResultInst"); 461 462 // Verify that the root of the result is an instruction. 463 DefInit *DI = dynamic_cast<DefInit*>(Result->getOperator()); 464 if (DI == 0 || !DI->getDef()->isSubClassOf("Instruction")) 465 throw TGError(R->getLoc(), "result of inst alias should be an instruction"); 466 467 ResultInst = &T.getInstruction(DI->getDef()); 468 469 // NameClass - If argument names are repeated, we need to verify they have 470 // the same class. 471 StringMap<Record*> NameClass; 472 for (unsigned i = 0, e = Result->getNumArgs(); i != e; ++i) { 473 DefInit *ADI = dynamic_cast<DefInit*>(Result->getArg(i)); 474 if (!ADI || Result->getArgName(i).empty()) 475 continue; 476 // Verify we don't have something like: (someinst GR16:$foo, GR32:$foo) 477 // $foo can exist multiple times in the result list, but it must have the 478 // same type. 479 Record *&Entry = NameClass[Result->getArgName(i)]; 480 if (Entry && Entry != ADI->getDef()) 481 throw TGError(R->getLoc(), "result value $" + Result->getArgName(i) + 482 " is both " + Entry->getName() + " and " + 483 ADI->getDef()->getName() + "!"); 484 Entry = ADI->getDef(); 485 } 486 487 // Decode and validate the arguments of the result. 488 unsigned AliasOpNo = 0; 489 for (unsigned i = 0, e = ResultInst->Operands.size(); i != e; ++i) { 490 491 // Tied registers don't have an entry in the result dag. 492 if (ResultInst->Operands[i].getTiedRegister() != -1) 493 continue; 494 495 if (AliasOpNo >= Result->getNumArgs()) 496 throw TGError(R->getLoc(), "not enough arguments for instruction!"); 497 498 Record *InstOpRec = ResultInst->Operands[i].Rec; 499 unsigned NumSubOps = ResultInst->Operands[i].MINumOperands; 500 ResultOperand ResOp(static_cast<int64_t>(0)); 501 if (tryAliasOpMatch(Result, AliasOpNo, InstOpRec, (NumSubOps > 1), 502 R->getLoc(), T, ResOp)) { 503 ResultOperands.push_back(ResOp); 504 ResultInstOperandIndex.push_back(std::make_pair(i, -1)); 505 ++AliasOpNo; 506 continue; 507 } 508 509 // If the argument did not match the instruction operand, and the operand 510 // is composed of multiple suboperands, try matching the suboperands. 511 if (NumSubOps > 1) { 512 DagInit *MIOI = ResultInst->Operands[i].MIOperandInfo; 513 for (unsigned SubOp = 0; SubOp != NumSubOps; ++SubOp) { 514 if (AliasOpNo >= Result->getNumArgs()) 515 throw TGError(R->getLoc(), "not enough arguments for instruction!"); 516 Record *SubRec = dynamic_cast<DefInit*>(MIOI->getArg(SubOp))->getDef(); 517 if (tryAliasOpMatch(Result, AliasOpNo, SubRec, false, 518 R->getLoc(), T, ResOp)) { 519 ResultOperands.push_back(ResOp); 520 ResultInstOperandIndex.push_back(std::make_pair(i, SubOp)); 521 ++AliasOpNo; 522 } else { 523 throw TGError(R->getLoc(), "result argument #" + utostr(AliasOpNo) + 524 " does not match instruction operand class " + 525 (SubOp == 0 ? InstOpRec->getName() :SubRec->getName())); 526 } 527 } 528 continue; 529 } 530 throw TGError(R->getLoc(), "result argument #" + utostr(AliasOpNo) + 531 " does not match instruction operand class " + 532 InstOpRec->getName()); 533 } 534 535 if (AliasOpNo != Result->getNumArgs()) 536 throw TGError(R->getLoc(), "too many operands for instruction!"); 537} 538