CodeGenInstruction.cpp revision c7cafcd815519b06318629b424abe746437e1389
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 <set> 18using namespace llvm; 19 20static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) { 21 // FIXME: Only supports TIED_TO for now. 22 std::string::size_type pos = CStr.find_first_of('='); 23 assert(pos != std::string::npos && "Unrecognized constraint"); 24 std::string::size_type start = CStr.find_first_not_of(" \t"); 25 std::string Name = CStr.substr(start, pos); 26 27 // TIED_TO: $src1 = $dst 28 std::string::size_type wpos = Name.find_first_of(" \t"); 29 if (wpos == std::string::npos) 30 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 31 std::string DestOpName = Name.substr(0, wpos); 32 std::pair<unsigned,unsigned> DestOp = I->ParseOperandName(DestOpName, false); 33 34 Name = CStr.substr(pos+1); 35 wpos = Name.find_first_not_of(" \t"); 36 if (wpos == std::string::npos) 37 throw "Illegal format for tied-to constraint: '" + CStr + "'"; 38 39 std::pair<unsigned,unsigned> SrcOp = 40 I->ParseOperandName(Name.substr(wpos), false); 41 if (SrcOp > DestOp) 42 throw "Illegal tied-to operand constraint '" + CStr + "'"; 43 44 45 unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp); 46 // Build the string for the operand. 47 std::string OpConstraint = 48 "((" + utostr(FlatOpNo) + " << 16) | (1 << TOI::TIED_TO))"; 49 50 51 if (!I->OperandList[DestOp.first].Constraints[DestOp.second].empty()) 52 throw "Operand '" + DestOpName + "' cannot have multiple constraints!"; 53 I->OperandList[DestOp.first].Constraints[DestOp.second] = OpConstraint; 54} 55 56static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) { 57 // Make sure the constraints list for each operand is large enough to hold 58 // constraint info, even if none is present. 59 for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i) 60 I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands); 61 62 if (CStr.empty()) return; 63 64 const std::string delims(","); 65 std::string::size_type bidx, eidx; 66 67 bidx = CStr.find_first_not_of(delims); 68 while (bidx != std::string::npos) { 69 eidx = CStr.find_first_of(delims, bidx); 70 if (eidx == std::string::npos) 71 eidx = CStr.length(); 72 73 ParseConstraint(CStr.substr(bidx, eidx), I); 74 bidx = CStr.find_first_not_of(delims, eidx); 75 } 76} 77 78CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr) 79 : TheDef(R), AsmString(AsmStr) { 80 Namespace = R->getValueAsString("Namespace"); 81 82 isReturn = R->getValueAsBit("isReturn"); 83 isBranch = R->getValueAsBit("isBranch"); 84 isIndirectBranch = R->getValueAsBit("isIndirectBranch"); 85 isBarrier = R->getValueAsBit("isBarrier"); 86 isCall = R->getValueAsBit("isCall"); 87 canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); 88 mayLoad = R->getValueAsBit("mayLoad"); 89 mayStore = R->getValueAsBit("mayStore"); 90 bool isTwoAddress = R->getValueAsBit("isTwoAddress"); 91 isPredicable = R->getValueAsBit("isPredicable"); 92 isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress"); 93 isCommutable = R->getValueAsBit("isCommutable"); 94 isTerminator = R->getValueAsBit("isTerminator"); 95 isReMaterializable = R->getValueAsBit("isReMaterializable"); 96 hasDelaySlot = R->getValueAsBit("hasDelaySlot"); 97 usesCustomDAGSchedInserter = R->getValueAsBit("usesCustomDAGSchedInserter"); 98 hasCtrlDep = R->getValueAsBit("hasCtrlDep"); 99 isNotDuplicable = R->getValueAsBit("isNotDuplicable"); 100 hasSideEffects = R->getValueAsBit("hasSideEffects"); 101 mayHaveSideEffects = R->getValueAsBit("mayHaveSideEffects"); 102 neverHasSideEffects = R->getValueAsBit("neverHasSideEffects"); 103 isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove"); 104 hasOptionalDef = false; 105 isVariadic = false; 106 107 if (mayHaveSideEffects + neverHasSideEffects + hasSideEffects > 1) 108 throw R->getName() + ": multiple conflicting side-effect flags set!"; 109 110 DagInit *DI; 111 try { 112 DI = R->getValueAsDag("OutOperandList"); 113 } catch (...) { 114 // Error getting operand list, just ignore it (sparcv9). 115 AsmString.clear(); 116 OperandList.clear(); 117 return; 118 } 119 NumDefs = DI->getNumArgs(); 120 121 DagInit *IDI; 122 try { 123 IDI = R->getValueAsDag("InOperandList"); 124 } catch (...) { 125 // Error getting operand list, just ignore it (sparcv9). 126 AsmString.clear(); 127 OperandList.clear(); 128 return; 129 } 130 DI = (DagInit*)(new BinOpInit(BinOpInit::CONCAT, DI, IDI))->Fold(R, 0); 131 132 unsigned MIOperandNo = 0; 133 std::set<std::string> OperandNames; 134 for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i) { 135 DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i)); 136 if (!Arg) 137 throw "Illegal operand for the '" + R->getName() + "' instruction!"; 138 139 Record *Rec = Arg->getDef(); 140 std::string PrintMethod = "printOperand"; 141 unsigned NumOps = 1; 142 DagInit *MIOpInfo = 0; 143 if (Rec->isSubClassOf("Operand")) { 144 PrintMethod = Rec->getValueAsString("PrintMethod"); 145 MIOpInfo = Rec->getValueAsDag("MIOperandInfo"); 146 147 // Verify that MIOpInfo has an 'ops' root value. 148 if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) || 149 dynamic_cast<DefInit*>(MIOpInfo->getOperator()) 150 ->getDef()->getName() != "ops") 151 throw "Bad value for MIOperandInfo in operand '" + Rec->getName() + 152 "'\n"; 153 154 // If we have MIOpInfo, then we have #operands equal to number of entries 155 // in MIOperandInfo. 156 if (unsigned NumArgs = MIOpInfo->getNumArgs()) 157 NumOps = NumArgs; 158 159 if (Rec->isSubClassOf("PredicateOperand")) 160 isPredicable = true; 161 else if (Rec->isSubClassOf("OptionalDefOperand")) 162 hasOptionalDef = true; 163 } else if (Rec->getName() == "variable_ops") { 164 isVariadic = true; 165 continue; 166 } else if (!Rec->isSubClassOf("RegisterClass") && 167 Rec->getName() != "ptr_rc" && Rec->getName() != "unknown") 168 throw "Unknown operand class '" + Rec->getName() + 169 "' in '" + R->getName() + "' instruction!"; 170 171 // Check that the operand has a name and that it's unique. 172 if (DI->getArgName(i).empty()) 173 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 174 " has no name!"; 175 if (!OperandNames.insert(DI->getArgName(i)).second) 176 throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + 177 " has the same name as a previous operand!"; 178 179 OperandList.push_back(OperandInfo(Rec, DI->getArgName(i), PrintMethod, 180 MIOperandNo, NumOps, MIOpInfo)); 181 MIOperandNo += NumOps; 182 } 183 184 // Parse Constraints. 185 ParseConstraints(R->getValueAsString("Constraints"), this); 186 187 // For backward compatibility: isTwoAddress means operand 1 is tied to 188 // operand 0. 189 if (isTwoAddress) { 190 if (!OperandList[1].Constraints[0].empty()) 191 throw R->getName() + ": cannot use isTwoAddress property: instruction " 192 "already has constraint set!"; 193 OperandList[1].Constraints[0] = "((0 << 16) | (1 << TOI::TIED_TO))"; 194 } 195 196 // Any operands with unset constraints get 0 as their constraint. 197 for (unsigned op = 0, e = OperandList.size(); op != e; ++op) 198 for (unsigned j = 0, e = OperandList[op].MINumOperands; j != e; ++j) 199 if (OperandList[op].Constraints[j].empty()) 200 OperandList[op].Constraints[j] = "0"; 201 202 // Parse the DisableEncoding field. 203 std::string DisableEncoding = R->getValueAsString("DisableEncoding"); 204 while (1) { 205 std::string OpName = getToken(DisableEncoding, " ,\t"); 206 if (OpName.empty()) break; 207 208 // Figure out which operand this is. 209 std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false); 210 211 // Mark the operand as not-to-be encoded. 212 if (Op.second >= OperandList[Op.first].DoNotEncode.size()) 213 OperandList[Op.first].DoNotEncode.resize(Op.second+1); 214 OperandList[Op.first].DoNotEncode[Op.second] = true; 215 } 216} 217 218/// getOperandNamed - Return the index of the operand with the specified 219/// non-empty name. If the instruction does not have an operand with the 220/// specified name, throw an exception. 221/// 222unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const { 223 assert(!Name.empty() && "Cannot search for operand with no name!"); 224 for (unsigned i = 0, e = OperandList.size(); i != e; ++i) 225 if (OperandList[i].Name == Name) return i; 226 throw "Instruction '" + TheDef->getName() + 227 "' does not have an operand named '$" + Name + "'!"; 228} 229 230std::pair<unsigned,unsigned> 231CodeGenInstruction::ParseOperandName(const std::string &Op, 232 bool AllowWholeOp) { 233 if (Op.empty() || Op[0] != '$') 234 throw TheDef->getName() + ": Illegal operand name: '" + Op + "'"; 235 236 std::string OpName = Op.substr(1); 237 std::string SubOpName; 238 239 // Check to see if this is $foo.bar. 240 std::string::size_type DotIdx = OpName.find_first_of("."); 241 if (DotIdx != std::string::npos) { 242 SubOpName = OpName.substr(DotIdx+1); 243 if (SubOpName.empty()) 244 throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'"; 245 OpName = OpName.substr(0, DotIdx); 246 } 247 248 unsigned OpIdx = getOperandNamed(OpName); 249 250 if (SubOpName.empty()) { // If no suboperand name was specified: 251 // If one was needed, throw. 252 if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp && 253 SubOpName.empty()) 254 throw TheDef->getName() + ": Illegal to refer to" 255 " whole operand part of complex operand '" + Op + "'"; 256 257 // Otherwise, return the operand. 258 return std::make_pair(OpIdx, 0U); 259 } 260 261 // Find the suboperand number involved. 262 DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo; 263 if (MIOpInfo == 0) 264 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 265 266 // Find the operand with the right name. 267 for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i) 268 if (MIOpInfo->getArgName(i) == SubOpName) 269 return std::make_pair(OpIdx, i); 270 271 // Otherwise, didn't find it! 272 throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; 273} 274