utils/TableGen/InstrInfoEmitter.cpp

   1 //===- InstrInfoEmitter.cpp - Generate a Instruction Set Desc. ------------===//
   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 tablegen backend is responsible for emitting a description of the target
  11 // instruction set for the code generator.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "InstrInfoEmitter.h"
  16 #include "CodeGenTarget.h"
  17 #include "Record.h"
  18 #include "llvm/ADT/StringExtras.h"
  19 #include <algorithm>
  20 using namespace llvm;
  21
  22 static void PrintDefList(const std::vector<Record*> &Uses,
  23                          unsigned Num, raw_ostream &OS) {
  24   OS << "static const unsigned ImplicitList" << Num << "[] = { ";
  25   for (unsigned i = 0, e = Uses.size(); i != e; ++i)
  26     OS << getQualifiedName(Uses[i]) << ", ";
  27   OS << "0 };\n";
  28 }
  29
  30 static void PrintBarriers(std::vector<Record*> &Barriers,
  31                           unsigned Num, raw_ostream &OS) {
  32   OS << "static const TargetRegisterClass* Barriers" << Num << "[] = { ";
  33   for (unsigned i = 0, e = Barriers.size(); i != e; ++i)
  34     OS << "&" << getQualifiedName(Barriers[i]) << "RegClass, ";
  35   OS << "NULL };\n";
  36 }
  37
  38 //===----------------------------------------------------------------------===//
  39 // Instruction Itinerary Information.
  40 //===----------------------------------------------------------------------===//
  41
  42 void InstrInfoEmitter::GatherItinClasses() {
  43   std::vector<Record*> DefList =
  44   Records.getAllDerivedDefinitions("InstrItinClass");
  45   std::sort(DefList.begin(), DefList.end(), LessRecord());
  46
  47   for (unsigned i = 0, N = DefList.size(); i < N; i++)
  48     ItinClassMap[DefList[i]->getName()] = i;
  49 }
  50
  51 unsigned InstrInfoEmitter::getItinClassNumber(const Record *InstRec) {
  52   return ItinClassMap[InstRec->getValueAsDef("Itinerary")->getName()];
  53 }
  54
  55 //===----------------------------------------------------------------------===//
  56 // Operand Info Emission.
  57 //===----------------------------------------------------------------------===//
  58
  59 std::vector<std::string>
  60 InstrInfoEmitter::GetOperandInfo(const CodeGenInstruction &Inst) {
  61   std::vector<std::string> Result;
  62
  63   for (unsigned i = 0, e = Inst.Operands.size(); i != e; ++i) {
  64     // Handle aggregate operands and normal operands the same way by expanding
  65     // either case into a list of operands for this op.
  66     std::vector<CGIOperandList::OperandInfo> OperandList;
  67
  68     // This might be a multiple operand thing.  Targets like X86 have
  69     // registers in their multi-operand operands.  It may also be an anonymous
  70     // operand, which has a single operand, but no declared class for the
  71     // operand.
  72     DagInit *MIOI = Inst.Operands[i].MIOperandInfo;
  73
  74     if (!MIOI || MIOI->getNumArgs() == 0) {
  75       // Single, anonymous, operand.
  76       OperandList.push_back(Inst.Operands[i]);
  77     } else {
  78       for (unsigned j = 0, e = Inst.Operands[i].MINumOperands; j != e; ++j) {
  79         OperandList.push_back(Inst.Operands[i]);
  80
  81         Record *OpR = dynamic_cast<DefInit*>(MIOI->getArg(j))->getDef();
  82         OperandList.back().Rec = OpR;
  83       }
  84     }
  85
  86     for (unsigned j = 0, e = OperandList.size(); j != e; ++j) {
  87       Record *OpR = OperandList[j].Rec;
  88       std::string Res;
  89
  90       if (OpR->isSubClassOf("RegisterClass"))
  91         Res += getQualifiedName(OpR) + "RegClassID, ";
  92       else if (OpR->isSubClassOf("PointerLikeRegClass"))
  93         Res += utostr(OpR->getValueAsInt("RegClassKind")) + ", ";
  94       else
  95         // -1 means the operand does not have a fixed register class.
  96         Res += "-1, ";
  97
  98       // Fill in applicable flags.
  99       Res += "0";
 100
 101       // Ptr value whose register class is resolved via callback.
 102       if (OpR->isSubClassOf("PointerLikeRegClass"))
 103         Res += "|(1<<TOI::LookupPtrRegClass)";
 104
 105       // Predicate operands.  Check to see if the original unexpanded operand
 106       // was of type PredicateOperand.
 107       if (Inst.Operands[i].Rec->isSubClassOf("PredicateOperand"))
 108         Res += "|(1<<TOI::Predicate)";
 109
 110       // Optional def operands.  Check to see if the original unexpanded operand
 111       // was of type OptionalDefOperand.
 112       if (Inst.Operands[i].Rec->isSubClassOf("OptionalDefOperand"))
 113         Res += "|(1<<TOI::OptionalDef)";
 114
 115       // Fill in constraint info.
 116       Res += ", ";
 117
 118       const CGIOperandList::ConstraintInfo &Constraint =
 119         Inst.Operands[i].Constraints[j];
 120       if (Constraint.isNone())
 121         Res += "0";
 122       else if (Constraint.isEarlyClobber())
 123         Res += "(1 << TOI::EARLY_CLOBBER)";
 124       else {
 125         assert(Constraint.isTied());
 126         Res += "((" + utostr(Constraint.getTiedOperand()) +
 127                     " << 16) | (1 << TOI::TIED_TO))";
 128       }
 129
 130       Result.push_back(Res);
 131     }
 132   }
 133
 134   return Result;
 135 }
 136
 137 void InstrInfoEmitter::EmitOperandInfo(raw_ostream &OS,
 138                                        OperandInfoMapTy &OperandInfoIDs) {
 139   // ID #0 is for no operand info.
 140   unsigned OperandListNum = 0;
 141   OperandInfoIDs[std::vector<std::string>()] = ++OperandListNum;
 142
 143   OS << "\n";
 144   const CodeGenTarget &Target = CDP.getTargetInfo();
 145   for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
 146        E = Target.inst_end(); II != E; ++II) {
 147     std::vector<std::string> OperandInfo = GetOperandInfo(**II);
 148     unsigned &N = OperandInfoIDs[OperandInfo];
 149     if (N != 0) continue;
 150
 151     N = ++OperandListNum;
 152     OS << "static const TargetOperandInfo OperandInfo" << N << "[] = { ";
 153     for (unsigned i = 0, e = OperandInfo.size(); i != e; ++i)
 154       OS << "{ " << OperandInfo[i] << " }, ";
 155     OS << "};\n";
 156   }
 157 }
 158
 159 void InstrInfoEmitter::DetectRegisterClassBarriers(std::vector<Record*> &Defs,
 160                                   const std::vector<CodeGenRegisterClass> &RCs,
 161                                   std::vector<Record*> &Barriers) {
 162   std::set<Record*> DefSet;
 163   unsigned NumDefs = Defs.size();
 164   for (unsigned i = 0; i < NumDefs; ++i)
 165     DefSet.insert(Defs[i]);
 166
 167   for (unsigned i = 0, e = RCs.size(); i != e; ++i) {
 168     const CodeGenRegisterClass &RC = RCs[i];
 169     unsigned NumRegs = RC.Elements.size();
 170     if (NumRegs > NumDefs)
 171       continue; // Can't possibly clobber this RC.
 172
 173     bool Clobber = true;
 174     for (unsigned j = 0; j < NumRegs; ++j) {
 175       Record *Reg = RC.Elements[j];
 176       if (!DefSet.count(Reg)) {
 177         Clobber = false;
 178         break;
 179       }
 180     }
 181     if (Clobber)
 182       Barriers.push_back(RC.TheDef);
 183   }
 184 }
 185
 186 //===----------------------------------------------------------------------===//
 187 // Main Output.
 188 //===----------------------------------------------------------------------===//
 189
 190 // run - Emit the main instruction description records for the target...
 191 void InstrInfoEmitter::run(raw_ostream &OS) {
 192   GatherItinClasses();
 193
 194   EmitSourceFileHeader("Target Instruction Descriptors", OS);
 195   OS << "namespace llvm {\n\n";
 196
 197   CodeGenTarget &Target = CDP.getTargetInfo();
 198   const std::string &TargetName = Target.getName();
 199   Record *InstrInfo = Target.getInstructionSet();
 200   const std::vector<CodeGenRegisterClass> &RCs = Target.getRegisterClasses();
 201
 202   // Keep track of all of the def lists we have emitted already.
 203   std::map<std::vector<Record*>, unsigned> EmittedLists;
 204   unsigned ListNumber = 0;
 205   std::map<std::vector<Record*>, unsigned> EmittedBarriers;
 206   unsigned BarrierNumber = 0;
 207   std::map<Record*, unsigned> BarriersMap;
 208
 209   // Emit all of the instruction's implicit uses and defs.
 210   for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
 211          E = Target.inst_end(); II != E; ++II) {
 212     Record *Inst = (*II)->TheDef;
 213     std::vector<Record*> Uses = Inst->getValueAsListOfDefs("Uses");
 214     if (!Uses.empty()) {
 215       unsigned &IL = EmittedLists[Uses];
 216       if (!IL) PrintDefList(Uses, IL = ++ListNumber, OS);
 217     }
 218     std::vector<Record*> Defs = Inst->getValueAsListOfDefs("Defs");
 219     if (!Defs.empty()) {
 220       std::vector<Record*> RCBarriers;
 221       DetectRegisterClassBarriers(Defs, RCs, RCBarriers);
 222       if (!RCBarriers.empty()) {
 223         unsigned &IB = EmittedBarriers[RCBarriers];
 224         if (!IB) PrintBarriers(RCBarriers, IB = ++BarrierNumber, OS);
 225         BarriersMap.insert(std::make_pair(Inst, IB));
 226       }
 227
 228       unsigned &IL = EmittedLists[Defs];
 229       if (!IL) PrintDefList(Defs, IL = ++ListNumber, OS);
 230     }
 231   }
 232
 233   OperandInfoMapTy OperandInfoIDs;
 234
 235   // Emit all of the operand info records.
 236   EmitOperandInfo(OS, OperandInfoIDs);
 237
 238   // Emit all of the TargetInstrDesc records in their ENUM ordering.
 239   //
 240   OS << "\nstatic const TargetInstrDesc " << TargetName
 241      << "Insts[] = {\n";
 242   const std::vector<const CodeGenInstruction*> &NumberedInstructions =
 243     Target.getInstructionsByEnumValue();
 244
 245   for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i)
 246     emitRecord(*NumberedInstructions[i], i, InstrInfo, EmittedLists,
 247                BarriersMap, OperandInfoIDs, OS);
 248   OS << "};\n";
 249   OS << "} // End llvm namespace \n";
 250 }
 251
 252 void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
 253                                   Record *InstrInfo,
 254                          std::map<std::vector<Record*>, unsigned> &EmittedLists,
 255                                   std::map<Record*, unsigned> &BarriersMap,
 256                                   const OperandInfoMapTy &OpInfo,
 257                                   raw_ostream &OS) {
 258   int MinOperands = 0;
 259   if (!Inst.Operands.size() == 0)
 260     // Each logical operand can be multiple MI operands.
 261     MinOperands = Inst.Operands.back().MIOperandNo +
 262                   Inst.Operands.back().MINumOperands;
 263
 264   OS << "  { ";
 265   OS << Num << ",\t" << MinOperands << ",\t"
 266      << Inst.Operands.NumDefs << ",\t" << getItinClassNumber(Inst.TheDef)
 267      << ",\t\"" << Inst.TheDef->getName() << "\", 0";
 268
 269   // Emit all of the target indepedent flags...
 270   if (Inst.isReturn)           OS << "|(1<<TID::Return)";
 271   if (Inst.isBranch)           OS << "|(1<<TID::Branch)";
 272   if (Inst.isIndirectBranch)   OS << "|(1<<TID::IndirectBranch)";
 273   if (Inst.isCompare)          OS << "|(1<<TID::Compare)";
 274   if (Inst.isMoveImm)          OS << "|(1<<TID::MoveImm)";
 275   if (Inst.isBarrier)          OS << "|(1<<TID::Barrier)";
 276   if (Inst.hasDelaySlot)       OS << "|(1<<TID::DelaySlot)";
 277   if (Inst.isCall)             OS << "|(1<<TID::Call)";
 278   if (Inst.canFoldAsLoad)      OS << "|(1<<TID::FoldableAsLoad)";
 279   if (Inst.mayLoad)            OS << "|(1<<TID::MayLoad)";
 280   if (Inst.mayStore)           OS << "|(1<<TID::MayStore)";
 281   if (Inst.isPredicable)       OS << "|(1<<TID::Predicable)";
 282   if (Inst.isConvertibleToThreeAddress) OS << "|(1<<TID::ConvertibleTo3Addr)";
 283   if (Inst.isCommutable)       OS << "|(1<<TID::Commutable)";
 284   if (Inst.isTerminator)       OS << "|(1<<TID::Terminator)";
 285   if (Inst.isReMaterializable) OS << "|(1<<TID::Rematerializable)";
 286   if (Inst.isNotDuplicable)    OS << "|(1<<TID::NotDuplicable)";
 287   if (Inst.Operands.hasOptionalDef) OS << "|(1<<TID::HasOptionalDef)";
 288   if (Inst.usesCustomInserter) OS << "|(1<<TID::UsesCustomInserter)";
 289   if (Inst.Operands.isVariadic)OS << "|(1<<TID::Variadic)";
 290   if (Inst.hasSideEffects)     OS << "|(1<<TID::UnmodeledSideEffects)";
 291   if (Inst.isAsCheapAsAMove)   OS << "|(1<<TID::CheapAsAMove)";
 292   if (Inst.hasExtraSrcRegAllocReq) OS << "|(1<<TID::ExtraSrcRegAllocReq)";
 293   if (Inst.hasExtraDefRegAllocReq) OS << "|(1<<TID::ExtraDefRegAllocReq)";
 294
 295   // Emit all of the target-specific flags...
 296   BitsInit *TSF = Inst.TheDef->getValueAsBitsInit("TSFlags");
 297   if (!TSF) throw "no TSFlags?";
 298   uint64_t Value = 0;
 299   for (unsigned i = 0, e = TSF->getNumBits(); i != e; ++i) {
 300     if (BitInit *Bit = dynamic_cast<BitInit*>(TSF->getBit(i)))
 301       Value |= uint64_t(Bit->getValue()) << i;
 302     else
 303       throw "Invalid TSFlags bit in " + Inst.TheDef->getName();
 304   }
 305   OS << ", 0x";
 306   OS.write_hex(Value);
 307   OS << "ULL, ";
 308
 309   // Emit the implicit uses and defs lists...
 310   std::vector<Record*> UseList = Inst.TheDef->getValueAsListOfDefs("Uses");
 311   if (UseList.empty())
 312     OS << "NULL, ";
 313   else
 314     OS << "ImplicitList" << EmittedLists[UseList] << ", ";
 315
 316   std::vector<Record*> DefList = Inst.TheDef->getValueAsListOfDefs("Defs");
 317   if (DefList.empty())
 318     OS << "NULL, ";
 319   else
 320     OS << "ImplicitList" << EmittedLists[DefList] << ", ";
 321
 322   std::map<Record*, unsigned>::iterator BI = BarriersMap.find(Inst.TheDef);
 323   if (BI == BarriersMap.end())
 324     OS << "NULL, ";
 325   else
 326     OS << "Barriers" << BI->second << ", ";
 327
 328   // Emit the operand info.
 329   std::vector<std::string> OperandInfo = GetOperandInfo(Inst);
 330   if (OperandInfo.empty())
 331     OS << "0";
 332   else
 333     OS << "OperandInfo" << OpInfo.find(OperandInfo)->second;
 334
 335   OS << " },  // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
 336 }