CodeGenInstruction.cpp revision b0be4d261b1ebd0e364e3e8b5e5f124c1e7b96b5
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 "Record.h" 16#include "llvm/ADT/StringExtras.h" 17#include "llvm/ADT/STLExtras.h" 18#include <set> 19using namespace llvm; 20 21static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) { 22 // EARLY_CLOBBER: @early $reg 23 std::string::size_type wpos = CStr.find_first_of(" \t"); 24 std::string::size_type start = CStr.find_first_not_of(" \t"); 25 std::string Tok = CStr.substr(start, wpos - start); 26 if (Tok == "@earlyclobber") { 27 std::string Name = CStr.substr(wpos+1); 28 wpos = Name.find_first_not_of(" \t"); 29 if (wpos == std::string::npos) 30 throw "Illegal format for @earlyclobber constraint: '" + CStr + "'"; 31 Name = Name.substr(wpos); 32 std::pair<unsigned,unsigned> Op = 33 I->ParseOperandName(Name, false); 34 35 // Build the string for the operand 36 if (!I->OperandList[Op.first].Constraints[Op.second].isNone()) 37 throw "Operand '" + Name + "' cannot have multiple constraints!"; 38 I->OperandList[Op.first].Constraints[Op.second] = 39 CodeGenInstruction::ConstraintInfo::getEarlyClobber(); 40 return; 41 } 42 43 // Only other constraint is "TIED_TO" for now. 44 std::string::size_type pos = CStr.find_first_of('='); 45 assert(pos != std::string::npos && "Unrecognized constraint"); 46 start = CStr.find_first_not_of(" \t"); 47 std::string Name = CStr.substr(start, pos - start); 48 49 // TIED_TO: $src1 = $dst 50 wpos = Name.find_first_of(" \t"); 51 if (wpos == std::string::npos) 52 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 53 std::string DestOpName = Name.substr(0, wpos); 54 std::pair<unsigned,unsigned> DestOp = I->ParseOperandName(DestOpName, false); 55 56 Name = CStr.substr(pos+1); 57 wpos = Name.find_first_not_of(" \t"); 58 if (wpos == std::string::npos) 59 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 60 61 std::pair<unsigned,unsigned> SrcOp = 62 I->ParseOperandName(Name.substr(wpos), false); 63 if (SrcOp > DestOp) 64 throw "Illegal tied-to operand constraint '" + CStr + "'"; 65 66 67 unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp); 68 69 if (!I->OperandList[DestOp.first].Constraints[DestOp.second].isNone()) 70 throw "Operand '" + DestOpName + "' cannot have multiple constraints!"; 71 I->OperandList[DestOp.first].Constraints[DestOp.second] = 72 CodeGenInstruction::ConstraintInfo::getTied(FlatOpNo); 73} 74 75static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) { 76 // Make sure the constraints list for each operand is large enough to hold 77 // constraint info, even if none is present. 78 for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i) 79 I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands); 80 81 if (CStr.empty()) return; 82 83 const std::string delims(","); 84 std::string::size_type bidx, eidx; 85 86 bidx = CStr.find_first_not_of(delims); 87 while (bidx != std::string::npos) { 88 eidx = CStr.find_first_of(delims, bidx); 89 if (eidx == std::string::npos) 90 eidx = CStr.length(); 91 92 ParseConstraint(CStr.substr(bidx, eidx - bidx), I); 93 bidx = CStr.find_first_not_of(delims, eidx); 94 } 95} 96 97CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr) 98 : TheDef(R), AsmString(AsmStr) { 99 Namespace = R->getValueAsString("Namespace"); 100 101 isReturn = R->getValueAsBit("isReturn"); 102 isBranch = R->getValueAsBit("isBranch"); 103 isIndirectBranch = R->getValueAsBit("isIndirectBranch"); 104 isBarrier = R->getValueAsBit("isBarrier"); 105 isCall = R->getValueAsBit("isCall"); 106 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); 107 mayLoad = R->getValueAsBit("mayLoad"); 108 mayStore = R->getValueAsBit("mayStore"); 109 bool isTwoAddress = R->getValueAsBit("isTwoAddress"); 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; 126 127 if (neverHasSideEffects + hasSideEffects > 1) 128 throw R->getName() + ": multiple conflicting side-effect flags set!"; 129 130 DagInit *DI = R->getValueAsDag("OutOperandList"); 131 132 if (DefInit *Init = dynamic_cast<DefInit*>(DI->getOperator())) { 133 if (Init->getDef()->getName() != "outs") 134 throw R->getName() + ": invalid def name for output list: use 'outs'"; 135 } else 136 throw R->getName() + ": invalid output list: use 'outs'"; 137 138 NumDefs = DI->getNumArgs(); 139 140 DagInit *IDI = R->getValueAsDag("InOperandList"); 141 if (DefInit *Init = dynamic_cast<DefInit*>(IDI->getOperator())) { 142 if (Init->getDef()->getName() != "ins") 143 throw R->getName() + ": invalid def name for input list: use 'ins'"; 144 } else 145 throw R->getName() + ": invalid input list: use 'ins'"; 146 147 DI = (DagInit*)(new BinOpInit(BinOpInit::CONCAT, 148 DI, IDI, new DagRecTy))->Fold(R, 0); 149 150 unsigned MIOperandNo = 0; 151 std::set<std::string> OperandNames; 152 for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i) { 153 DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i)); 154 if (!Arg) 155 throw "Illegal operand for the '" + R->getName() + "' instruction!"; 156 157 Record *Rec = Arg->getDef(); 158 std::string PrintMethod = "printOperand"; 159 unsigned NumOps = 1; 160 DagInit *MIOpInfo = 0; 161 if (Rec->isSubClassOf("Operand")) { 162 PrintMethod = Rec->getValueAsString("PrintMethod"); 163 MIOpInfo = Rec->getValueAsDag("MIOperandInfo"); 164 165 // Verify that MIOpInfo has an 'ops' root value. 166 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) || 167 dynamic_cast<DefInit*>(MIOpInfo->getOperator()) 168 ->getDef()->getName() != "ops") 169 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() + 170 "'\n"; 171 172 // If we have MIOpInfo, then we have #operands equal to number of entries 173 // in MIOperandInfo. 174 if (unsigned NumArgs = MIOpInfo->getNumArgs()) 175 NumOps = NumArgs; 176 177 if (Rec->isSubClassOf("PredicateOperand")) 178 isPredicable = true; 179 else if (Rec->isSubClassOf("OptionalDefOperand")) 180 hasOptionalDef = true; 181 } else if (Rec->getName() == "variable_ops") { 182 isVariadic = true; 183 continue; 184 } else if (!Rec->isSubClassOf("RegisterClass") && 185 Rec->getName() != "ptr_rc" && Rec->getName() != "unknown") 186 throw "Unknown operand class '" + Rec->getName() + 187 "' in '" + R->getName() + "' instruction!"; 188 189 // Check that the operand has a name and that it's unique. 190 if (DI->getArgName(i).empty()) 191 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 192 " has no name!"; 193 if (!OperandNames.insert(DI->getArgName(i)).second) 194 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 195 " has the same name as a previous operand!"; 196 197 OperandList.push_back(OperandInfo(Rec, DI->getArgName(i), PrintMethod, 198 MIOperandNo, NumOps, MIOpInfo)); 199 MIOperandNo += NumOps; 200 } 201 202 // Parse Constraints. 203 ParseConstraints(R->getValueAsString("Constraints"), this); 204 205 // For backward compatibility: isTwoAddress means operand 1 is tied to 206 // operand 0. 207 if (isTwoAddress) { 208 if (!OperandList[1].Constraints[0].isNone()) 209 throw R->getName() + ": cannot use isTwoAddress property: instruction " 210 "already has constraint set!"; 211 OperandList[1].Constraints[0] = 212 CodeGenInstruction::ConstraintInfo::getTied(0); 213 } 214 215 // Parse the DisableEncoding field. 216 std::string DisableEncoding = R->getValueAsString("DisableEncoding"); 217 while (1) { 218 std::string OpName; 219 tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t"); 220 if (OpName.empty()) break; 221 222 // Figure out which operand this is. 223 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false); 224 225 // Mark the operand as not-to-be encoded. 226 if (Op.second >= OperandList[Op.first].DoNotEncode.size()) 227 OperandList[Op.first].DoNotEncode.resize(Op.second+1); 228 OperandList[Op.first].DoNotEncode[Op.second] = true; 229 } 230} 231 232/// getOperandNamed - Return the index of the operand with the specified 233/// non-empty name. If the instruction does not have an operand with the 234/// specified name, throw an exception. 235/// 236unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const { 237 assert(!Name.empty() && "Cannot search for operand with no name!"); 238 for (unsigned i = 0, e = OperandList.size(); i != e; ++i) 239 if (OperandList[i].Name == Name) return i; 240 throw "Instruction '" + TheDef->getName() + 241 "' does not have an operand named '$" + Name + "'!"; 242} 243 244std::pair<unsigned,unsigned> 245CodeGenInstruction::ParseOperandName(const std::string &Op, 246 bool AllowWholeOp) { 247 if (Op.empty() || Op[0] != '$') 248 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'"; 249 250 std::string OpName = Op.substr(1); 251 std::string SubOpName; 252 253 // Check to see if this is $foo.bar. 254 std::string::size_type DotIdx = OpName.find_first_of("."); 255 if (DotIdx != std::string::npos) { 256 SubOpName = OpName.substr(DotIdx+1); 257 if (SubOpName.empty()) 258 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'"; 259 OpName = OpName.substr(0, DotIdx); 260 } 261 262 unsigned OpIdx = getOperandNamed(OpName); 263 264 if (SubOpName.empty()) { // If no suboperand name was specified: 265 // If one was needed, throw. 266 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp && 267 SubOpName.empty()) 268 throw TheDef->getName() + ": Illegal to refer to" 269 " whole operand part of complex operand '" + Op + "'"; 270 271 // Otherwise, return the operand. 272 return std::make_pair(OpIdx, 0U); 273 } 274 275 // Find the suboperand number involved. 276 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo; 277 if (MIOpInfo == 0) 278 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 279 280 // Find the operand with the right name. 281 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i) 282 if (MIOpInfo->getArgName(i) == SubOpName) 283 return std::make_pair(OpIdx, i); 284 285 // Otherwise, didn't find it! 286 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 287} 288