CodeGenInstruction.cpp revision c240bb0ede0541426254d0e0dc81d891beda4b22
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/STLExtras.h" 19#include <set> 20using namespace llvm; 21 22//===----------------------------------------------------------------------===// 23// CGIOperandList Implementation 24//===----------------------------------------------------------------------===// 25 26CGIOperandList::CGIOperandList(Record *R) : TheDef(R) { 27 isPredicable = false; 28 hasOptionalDef = false; 29 isVariadic = false; 30 31 DagInit *OutDI = R->getValueAsDag("OutOperandList"); 32 33 if (DefInit *Init = dynamic_cast<DefInit*>(OutDI->getOperator())) { 34 if (Init->getDef()->getName() != "outs") 35 throw R->getName() + ": invalid def name for output list: use 'outs'"; 36 } else 37 throw R->getName() + ": invalid output list: use 'outs'"; 38 39 NumDefs = OutDI->getNumArgs(); 40 41 DagInit *InDI = R->getValueAsDag("InOperandList"); 42 if (DefInit *Init = dynamic_cast<DefInit*>(InDI->getOperator())) { 43 if (Init->getDef()->getName() != "ins") 44 throw R->getName() + ": invalid def name for input list: use 'ins'"; 45 } else 46 throw R->getName() + ": invalid input list: use 'ins'"; 47 48 unsigned MIOperandNo = 0; 49 std::set<std::string> OperandNames; 50 for (unsigned i = 0, e = InDI->getNumArgs()+OutDI->getNumArgs(); i != e; ++i){ 51 Init *ArgInit; 52 std::string ArgName; 53 if (i < NumDefs) { 54 ArgInit = OutDI->getArg(i); 55 ArgName = OutDI->getArgName(i); 56 } else { 57 ArgInit = InDI->getArg(i-NumDefs); 58 ArgName = InDI->getArgName(i-NumDefs); 59 } 60 61 DefInit *Arg = dynamic_cast<DefInit*>(ArgInit); 62 if (!Arg) 63 throw "Illegal operand for the '" + R->getName() + "' instruction!"; 64 65 Record *Rec = Arg->getDef(); 66 std::string PrintMethod = "printOperand"; 67 std::string EncoderMethod; 68 unsigned NumOps = 1; 69 DagInit *MIOpInfo = 0; 70 if (Rec->isSubClassOf("Operand")) { 71 PrintMethod = Rec->getValueAsString("PrintMethod"); 72 // If there is an explicit encoder method, use it. 73 if (Rec->getValue("EncoderMethod")) 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->getName() != "ptr_rc" && Rec->getName() != "unknown") 98 throw "Unknown operand class '" + Rec->getName() + 99 "' in '" + R->getName() + "' instruction!"; 100 101 // Check that the operand has a name and that it's unique. 102 if (ArgName.empty()) 103 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 104 " has no name!"; 105 if (!OperandNames.insert(ArgName).second) 106 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 107 " has the same name as a previous operand!"; 108 109 OperandList.push_back(OperandInfo(Rec, ArgName, PrintMethod, EncoderMethod, 110 MIOperandNo, NumOps, MIOpInfo)); 111 MIOperandNo += NumOps; 112 } 113} 114 115 116/// getOperandNamed - Return the index of the operand with the specified 117/// non-empty name. If the instruction does not have an operand with the 118/// specified name, throw an exception. 119/// 120unsigned CGIOperandList::getOperandNamed(StringRef Name) const { 121 unsigned OpIdx; 122 if (hasOperandNamed(Name, OpIdx)) return OpIdx; 123 throw "'" + TheDef->getName() + "' does not have an operand named '$" + 124 Name.str() + "'!"; 125} 126 127/// hasOperandNamed - Query whether the instruction has an operand of the 128/// given name. If so, return true and set OpIdx to the index of the 129/// operand. Otherwise, return false. 130bool CGIOperandList::hasOperandNamed(StringRef Name, unsigned &OpIdx) const { 131 assert(!Name.empty() && "Cannot search for operand with no name!"); 132 for (unsigned i = 0, e = OperandList.size(); i != e; ++i) 133 if (OperandList[i].Name == Name) { 134 OpIdx = i; 135 return true; 136 } 137 return false; 138} 139 140std::pair<unsigned,unsigned> 141CGIOperandList::ParseOperandName(const std::string &Op, bool AllowWholeOp) { 142 if (Op.empty() || Op[0] != '$') 143 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'"; 144 145 std::string OpName = Op.substr(1); 146 std::string SubOpName; 147 148 // Check to see if this is $foo.bar. 149 std::string::size_type DotIdx = OpName.find_first_of("."); 150 if (DotIdx != std::string::npos) { 151 SubOpName = OpName.substr(DotIdx+1); 152 if (SubOpName.empty()) 153 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'"; 154 OpName = OpName.substr(0, DotIdx); 155 } 156 157 unsigned OpIdx = getOperandNamed(OpName); 158 159 if (SubOpName.empty()) { // If no suboperand name was specified: 160 // If one was needed, throw. 161 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp && 162 SubOpName.empty()) 163 throw TheDef->getName() + ": Illegal to refer to" 164 " whole operand part of complex operand '" + Op + "'"; 165 166 // Otherwise, return the operand. 167 return std::make_pair(OpIdx, 0U); 168 } 169 170 // Find the suboperand number involved. 171 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo; 172 if (MIOpInfo == 0) 173 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 174 175 // Find the operand with the right name. 176 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i) 177 if (MIOpInfo->getArgName(i) == SubOpName) 178 return std::make_pair(OpIdx, i); 179 180 // Otherwise, didn't find it! 181 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 182} 183 184static void ParseConstraint(const std::string &CStr, CGIOperandList &Ops) { 185 // EARLY_CLOBBER: @early $reg 186 std::string::size_type wpos = CStr.find_first_of(" \t"); 187 std::string::size_type start = CStr.find_first_not_of(" \t"); 188 std::string Tok = CStr.substr(start, wpos - start); 189 if (Tok == "@earlyclobber") { 190 std::string Name = CStr.substr(wpos+1); 191 wpos = Name.find_first_not_of(" \t"); 192 if (wpos == std::string::npos) 193 throw "Illegal format for @earlyclobber constraint: '" + CStr + "'"; 194 Name = Name.substr(wpos); 195 std::pair<unsigned,unsigned> Op = Ops.ParseOperandName(Name, false); 196 197 // Build the string for the operand 198 if (!Ops[Op.first].Constraints[Op.second].isNone()) 199 throw "Operand '" + Name + "' cannot have multiple constraints!"; 200 Ops[Op.first].Constraints[Op.second] = 201 CGIOperandList::ConstraintInfo::getEarlyClobber(); 202 return; 203 } 204 205 // Only other constraint is "TIED_TO" for now. 206 std::string::size_type pos = CStr.find_first_of('='); 207 assert(pos != std::string::npos && "Unrecognized constraint"); 208 start = CStr.find_first_not_of(" \t"); 209 std::string Name = CStr.substr(start, pos - start); 210 211 // TIED_TO: $src1 = $dst 212 wpos = Name.find_first_of(" \t"); 213 if (wpos == std::string::npos) 214 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 215 std::string DestOpName = Name.substr(0, wpos); 216 std::pair<unsigned,unsigned> DestOp = Ops.ParseOperandName(DestOpName, false); 217 218 Name = CStr.substr(pos+1); 219 wpos = Name.find_first_not_of(" \t"); 220 if (wpos == std::string::npos) 221 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 222 223 std::pair<unsigned,unsigned> SrcOp = 224 Ops.ParseOperandName(Name.substr(wpos), false); 225 if (SrcOp > DestOp) 226 throw "Illegal tied-to operand constraint '" + CStr + "'"; 227 228 229 unsigned FlatOpNo = Ops.getFlattenedOperandNumber(SrcOp); 230 231 if (!Ops[DestOp.first].Constraints[DestOp.second].isNone()) 232 throw "Operand '" + DestOpName + "' cannot have multiple constraints!"; 233 Ops[DestOp.first].Constraints[DestOp.second] = 234 CGIOperandList::ConstraintInfo::getTied(FlatOpNo); 235} 236 237static void ParseConstraints(const std::string &CStr, CGIOperandList &Ops) { 238 // Make sure the constraints list for each operand is large enough to hold 239 // constraint info, even if none is present. 240 for (unsigned i = 0, e = Ops.size(); i != e; ++i) 241 Ops[i].Constraints.resize(Ops[i].MINumOperands); 242 243 if (CStr.empty()) return; 244 245 const std::string delims(","); 246 std::string::size_type bidx, eidx; 247 248 bidx = CStr.find_first_not_of(delims); 249 while (bidx != std::string::npos) { 250 eidx = CStr.find_first_of(delims, bidx); 251 if (eidx == std::string::npos) 252 eidx = CStr.length(); 253 254 ParseConstraint(CStr.substr(bidx, eidx - bidx), Ops); 255 bidx = CStr.find_first_not_of(delims, eidx); 256 } 257} 258 259void CGIOperandList::ProcessDisableEncoding(std::string DisableEncoding) { 260 while (1) { 261 std::string OpName; 262 tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t"); 263 if (OpName.empty()) break; 264 265 // Figure out which operand this is. 266 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false); 267 268 // Mark the operand as not-to-be encoded. 269 if (Op.second >= OperandList[Op.first].DoNotEncode.size()) 270 OperandList[Op.first].DoNotEncode.resize(Op.second+1); 271 OperandList[Op.first].DoNotEncode[Op.second] = true; 272 } 273 274} 275 276//===----------------------------------------------------------------------===// 277// CodeGenInstruction Implementation 278//===----------------------------------------------------------------------===// 279 280CodeGenInstruction::CodeGenInstruction(Record *R) : TheDef(R), Operands(R) { 281 Namespace = R->getValueAsString("Namespace"); 282 AsmString = R->getValueAsString("AsmString"); 283 284 isReturn = R->getValueAsBit("isReturn"); 285 isBranch = R->getValueAsBit("isBranch"); 286 isIndirectBranch = R->getValueAsBit("isIndirectBranch"); 287 isCompare = R->getValueAsBit("isCompare"); 288 isBarrier = R->getValueAsBit("isBarrier"); 289 isCall = R->getValueAsBit("isCall"); 290 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); 291 mayLoad = R->getValueAsBit("mayLoad"); 292 mayStore = R->getValueAsBit("mayStore"); 293 isPredicable = Operands.isPredicable || R->getValueAsBit("isPredicable"); 294 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress"); 295 isCommutable = R->getValueAsBit("isCommutable"); 296 isTerminator = R->getValueAsBit("isTerminator"); 297 isReMaterializable = R->getValueAsBit("isReMaterializable"); 298 hasDelaySlot = R->getValueAsBit("hasDelaySlot"); 299 usesCustomInserter = R->getValueAsBit("usesCustomInserter"); 300 hasCtrlDep = R->getValueAsBit("hasCtrlDep"); 301 isNotDuplicable = R->getValueAsBit("isNotDuplicable"); 302 hasSideEffects = R->getValueAsBit("hasSideEffects"); 303 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects"); 304 isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove"); 305 hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq"); 306 hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq"); 307 ImplicitDefs = R->getValueAsListOfDefs("Defs"); 308 ImplicitUses = R->getValueAsListOfDefs("Uses"); 309 310 if (neverHasSideEffects + hasSideEffects > 1) 311 throw R->getName() + ": multiple conflicting side-effect flags set!"; 312 313 // Parse Constraints. 314 ParseConstraints(R->getValueAsString("Constraints"), Operands); 315 316 // Parse the DisableEncoding field. 317 Operands.ProcessDisableEncoding(R->getValueAsString("DisableEncoding")); 318} 319 320/// HasOneImplicitDefWithKnownVT - If the instruction has at least one 321/// implicit def and it has a known VT, return the VT, otherwise return 322/// MVT::Other. 323MVT::SimpleValueType CodeGenInstruction:: 324HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const { 325 if (ImplicitDefs.empty()) return MVT::Other; 326 327 // Check to see if the first implicit def has a resolvable type. 328 Record *FirstImplicitDef = ImplicitDefs[0]; 329 assert(FirstImplicitDef->isSubClassOf("Register")); 330 const std::vector<MVT::SimpleValueType> &RegVTs = 331 TargetInfo.getRegisterVTs(FirstImplicitDef); 332 if (RegVTs.size() == 1) 333 return RegVTs[0]; 334 return MVT::Other; 335} 336 337 338/// FlattenAsmStringVariants - Flatten the specified AsmString to only 339/// include text from the specified variant, returning the new string. 340std::string CodeGenInstruction:: 341FlattenAsmStringVariants(StringRef Cur, unsigned Variant) { 342 std::string Res = ""; 343 344 for (;;) { 345 // Find the start of the next variant string. 346 size_t VariantsStart = 0; 347 for (size_t e = Cur.size(); VariantsStart != e; ++VariantsStart) 348 if (Cur[VariantsStart] == '{' && 349 (VariantsStart == 0 || (Cur[VariantsStart-1] != '$' && 350 Cur[VariantsStart-1] != '\\'))) 351 break; 352 353 // Add the prefix to the result. 354 Res += Cur.slice(0, VariantsStart); 355 if (VariantsStart == Cur.size()) 356 break; 357 358 ++VariantsStart; // Skip the '{'. 359 360 // Scan to the end of the variants string. 361 size_t VariantsEnd = VariantsStart; 362 unsigned NestedBraces = 1; 363 for (size_t e = Cur.size(); VariantsEnd != e; ++VariantsEnd) { 364 if (Cur[VariantsEnd] == '}' && Cur[VariantsEnd-1] != '\\') { 365 if (--NestedBraces == 0) 366 break; 367 } else if (Cur[VariantsEnd] == '{') 368 ++NestedBraces; 369 } 370 371 // Select the Nth variant (or empty). 372 StringRef Selection = Cur.slice(VariantsStart, VariantsEnd); 373 for (unsigned i = 0; i != Variant; ++i) 374 Selection = Selection.split('|').second; 375 Res += Selection.split('|').first; 376 377 assert(VariantsEnd != Cur.size() && 378 "Unterminated variants in assembly string!"); 379 Cur = Cur.substr(VariantsEnd + 1); 380 } 381 382 return Res; 383} 384 385