CodeGenInstruction.cpp revision 5b55ff0c1555031c1c85f88d67c3b566750a9319
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 22static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) { 23 // EARLY_CLOBBER: @early $reg 24 std::string::size_type wpos = CStr.find_first_of(" \t"); 25 std::string::size_type start = CStr.find_first_not_of(" \t"); 26 std::string Tok = CStr.substr(start, wpos - start); 27 if (Tok == "@earlyclobber") { 28 std::string Name = CStr.substr(wpos+1); 29 wpos = Name.find_first_not_of(" \t"); 30 if (wpos == std::string::npos) 31 throw "Illegal format for @earlyclobber constraint: '" + CStr + "'"; 32 Name = Name.substr(wpos); 33 std::pair<unsigned,unsigned> Op = 34 I->ParseOperandName(Name, false); 35 36 // Build the string for the operand 37 if (!I->OperandList[Op.first].Constraints[Op.second].isNone()) 38 throw "Operand '" + Name + "' cannot have multiple constraints!"; 39 I->OperandList[Op.first].Constraints[Op.second] = 40 CodeGenInstruction::ConstraintInfo::getEarlyClobber(); 41 return; 42 } 43 44 // Only other constraint is "TIED_TO" for now. 45 std::string::size_type pos = CStr.find_first_of('='); 46 assert(pos != std::string::npos && "Unrecognized constraint"); 47 start = CStr.find_first_not_of(" \t"); 48 std::string Name = CStr.substr(start, pos - start); 49 50 // TIED_TO: $src1 = $dst 51 wpos = Name.find_first_of(" \t"); 52 if (wpos == std::string::npos) 53 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 54 std::string DestOpName = Name.substr(0, wpos); 55 std::pair<unsigned,unsigned> DestOp = I->ParseOperandName(DestOpName, false); 56 57 Name = CStr.substr(pos+1); 58 wpos = Name.find_first_not_of(" \t"); 59 if (wpos == std::string::npos) 60 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 61 62 std::pair<unsigned,unsigned> SrcOp = 63 I->ParseOperandName(Name.substr(wpos), false); 64 if (SrcOp > DestOp) 65 throw "Illegal tied-to operand constraint '" + CStr + "'"; 66 67 68 unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp); 69 70 if (!I->OperandList[DestOp.first].Constraints[DestOp.second].isNone()) 71 throw "Operand '" + DestOpName + "' cannot have multiple constraints!"; 72 I->OperandList[DestOp.first].Constraints[DestOp.second] = 73 CodeGenInstruction::ConstraintInfo::getTied(FlatOpNo); 74} 75 76static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) { 77 // Make sure the constraints list for each operand is large enough to hold 78 // constraint info, even if none is present. 79 for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i) 80 I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands); 81 82 if (CStr.empty()) return; 83 84 const std::string delims(","); 85 std::string::size_type bidx, eidx; 86 87 bidx = CStr.find_first_not_of(delims); 88 while (bidx != std::string::npos) { 89 eidx = CStr.find_first_of(delims, bidx); 90 if (eidx == std::string::npos) 91 eidx = CStr.length(); 92 93 ParseConstraint(CStr.substr(bidx, eidx - bidx), I); 94 bidx = CStr.find_first_not_of(delims, eidx); 95 } 96} 97 98CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr) 99 : TheDef(R), AsmString(AsmStr) { 100 Namespace = R->getValueAsString("Namespace"); 101 102 isReturn = R->getValueAsBit("isReturn"); 103 isBranch = R->getValueAsBit("isBranch"); 104 isIndirectBranch = R->getValueAsBit("isIndirectBranch"); 105 isBarrier = R->getValueAsBit("isBarrier"); 106 isCall = R->getValueAsBit("isCall"); 107 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); 108 mayLoad = R->getValueAsBit("mayLoad"); 109 mayStore = R->getValueAsBit("mayStore"); 110 isPredicable = R->getValueAsBit("isPredicable"); 111 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress"); 112 isCommutable = R->getValueAsBit("isCommutable"); 113 isTerminator = R->getValueAsBit("isTerminator"); 114 isReMaterializable = R->getValueAsBit("isReMaterializable"); 115 hasDelaySlot = R->getValueAsBit("hasDelaySlot"); 116 usesCustomInserter = R->getValueAsBit("usesCustomInserter"); 117 hasCtrlDep = R->getValueAsBit("hasCtrlDep"); 118 isNotDuplicable = R->getValueAsBit("isNotDuplicable"); 119 hasSideEffects = R->getValueAsBit("hasSideEffects"); 120 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects"); 121 isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove"); 122 hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq"); 123 hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq"); 124 hasOptionalDef = false; 125 isVariadic = false; 126 ImplicitDefs = R->getValueAsListOfDefs("Defs"); 127 ImplicitUses = R->getValueAsListOfDefs("Uses"); 128 129 if (neverHasSideEffects + hasSideEffects > 1) 130 throw R->getName() + ": multiple conflicting side-effect flags set!"; 131 132 DagInit *OutDI = R->getValueAsDag("OutOperandList"); 133 134 if (DefInit *Init = dynamic_cast<DefInit*>(OutDI->getOperator())) { 135 if (Init->getDef()->getName() != "outs") 136 throw R->getName() + ": invalid def name for output list: use 'outs'"; 137 } else 138 throw R->getName() + ": invalid output list: use 'outs'"; 139 140 NumDefs = OutDI->getNumArgs(); 141 142 DagInit *InDI = R->getValueAsDag("InOperandList"); 143 if (DefInit *Init = dynamic_cast<DefInit*>(InDI->getOperator())) { 144 if (Init->getDef()->getName() != "ins") 145 throw R->getName() + ": invalid def name for input list: use 'ins'"; 146 } else 147 throw R->getName() + ": invalid input list: use 'ins'"; 148 149 unsigned MIOperandNo = 0; 150 std::set<std::string> OperandNames; 151 for (unsigned i = 0, e = InDI->getNumArgs()+OutDI->getNumArgs(); i != e; ++i){ 152 Init *ArgInit; 153 std::string ArgName; 154 if (i < NumDefs) { 155 ArgInit = OutDI->getArg(i); 156 ArgName = OutDI->getArgName(i); 157 } else { 158 ArgInit = InDI->getArg(i-NumDefs); 159 ArgName = InDI->getArgName(i-NumDefs); 160 } 161 162 DefInit *Arg = dynamic_cast<DefInit*>(ArgInit); 163 if (!Arg) 164 throw "Illegal operand for the '" + R->getName() + "' instruction!"; 165 166 Record *Rec = Arg->getDef(); 167 std::string PrintMethod = "printOperand"; 168 unsigned NumOps = 1; 169 DagInit *MIOpInfo = 0; 170 if (Rec->isSubClassOf("Operand")) { 171 PrintMethod = Rec->getValueAsString("PrintMethod"); 172 MIOpInfo = Rec->getValueAsDag("MIOperandInfo"); 173 174 // Verify that MIOpInfo has an 'ops' root value. 175 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) || 176 dynamic_cast<DefInit*>(MIOpInfo->getOperator()) 177 ->getDef()->getName() != "ops") 178 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() + 179 "'\n"; 180 181 // If we have MIOpInfo, then we have #operands equal to number of entries 182 // in MIOperandInfo. 183 if (unsigned NumArgs = MIOpInfo->getNumArgs()) 184 NumOps = NumArgs; 185 186 if (Rec->isSubClassOf("PredicateOperand")) 187 isPredicable = true; 188 else if (Rec->isSubClassOf("OptionalDefOperand")) 189 hasOptionalDef = true; 190 } else if (Rec->getName() == "variable_ops") { 191 isVariadic = true; 192 continue; 193 } else if (!Rec->isSubClassOf("RegisterClass") && 194 Rec->getName() != "ptr_rc" && Rec->getName() != "unknown") 195 throw "Unknown operand class '" + Rec->getName() + 196 "' in '" + R->getName() + "' instruction!"; 197 198 // Check that the operand has a name and that it's unique. 199 if (ArgName.empty()) 200 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 201 " has no name!"; 202 if (!OperandNames.insert(ArgName).second) 203 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 204 " has the same name as a previous operand!"; 205 206 OperandList.push_back(OperandInfo(Rec, ArgName, PrintMethod, 207 MIOperandNo, NumOps, MIOpInfo)); 208 MIOperandNo += NumOps; 209 } 210 211 // Parse Constraints. 212 ParseConstraints(R->getValueAsString("Constraints"), this); 213 214 // Parse the DisableEncoding field. 215 std::string DisableEncoding = R->getValueAsString("DisableEncoding"); 216 while (1) { 217 std::string OpName; 218 tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t"); 219 if (OpName.empty()) break; 220 221 // Figure out which operand this is. 222 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false); 223 224 // Mark the operand as not-to-be encoded. 225 if (Op.second >= OperandList[Op.first].DoNotEncode.size()) 226 OperandList[Op.first].DoNotEncode.resize(Op.second+1); 227 OperandList[Op.first].DoNotEncode[Op.second] = true; 228 } 229} 230 231/// getOperandNamed - Return the index of the operand with the specified 232/// non-empty name. If the instruction does not have an operand with the 233/// specified name, throw an exception. 234/// 235unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const { 236 assert(!Name.empty() && "Cannot search for operand with no name!"); 237 for (unsigned i = 0, e = OperandList.size(); i != e; ++i) 238 if (OperandList[i].Name == Name) return i; 239 throw "Instruction '" + TheDef->getName() + 240 "' does not have an operand named '$" + Name + "'!"; 241} 242 243std::pair<unsigned,unsigned> 244CodeGenInstruction::ParseOperandName(const std::string &Op, 245 bool AllowWholeOp) { 246 if (Op.empty() || Op[0] != '$') 247 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'"; 248 249 std::string OpName = Op.substr(1); 250 std::string SubOpName; 251 252 // Check to see if this is $foo.bar. 253 std::string::size_type DotIdx = OpName.find_first_of("."); 254 if (DotIdx != std::string::npos) { 255 SubOpName = OpName.substr(DotIdx+1); 256 if (SubOpName.empty()) 257 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'"; 258 OpName = OpName.substr(0, DotIdx); 259 } 260 261 unsigned OpIdx = getOperandNamed(OpName); 262 263 if (SubOpName.empty()) { // If no suboperand name was specified: 264 // If one was needed, throw. 265 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp && 266 SubOpName.empty()) 267 throw TheDef->getName() + ": Illegal to refer to" 268 " whole operand part of complex operand '" + Op + "'"; 269 270 // Otherwise, return the operand. 271 return std::make_pair(OpIdx, 0U); 272 } 273 274 // Find the suboperand number involved. 275 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo; 276 if (MIOpInfo == 0) 277 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 278 279 // Find the operand with the right name. 280 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i) 281 if (MIOpInfo->getArgName(i) == SubOpName) 282 return std::make_pair(OpIdx, i); 283 284 // Otherwise, didn't find it! 285 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 286} 287 288 289/// HasOneImplicitDefWithKnownVT - If the instruction has at least one 290/// implicit def and it has a known VT, return the VT, otherwise return 291/// MVT::Other. 292MVT::SimpleValueType CodeGenInstruction:: 293HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const { 294 if (ImplicitDefs.empty()) return MVT::Other; 295 296 // Check to see if the first implicit def has a resolvable type. 297 Record *FirstImplicitDef = ImplicitDefs[0]; 298 assert(FirstImplicitDef->isSubClassOf("Register")); 299 const std::vector<MVT::SimpleValueType> &RegVTs = 300 TargetInfo.getRegisterVTs(FirstImplicitDef); 301 if (RegVTs.size() == 1) 302 return RegVTs[0]; 303 return MVT::Other; 304} 305 306