utils/TableGen/CodeGenInstruction.h

   1 //===- CodeGenInstruction.h - Instruction Class Wrapper ---------*- C++ -*-===//
   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 defines a wrapper class for the 'Instruction' TableGen class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef CODEGEN_INSTRUCTION_H
  15 #define CODEGEN_INSTRUCTION_H
  16
  17 #include "llvm/CodeGen/ValueTypes.h"
  18 #include "llvm/ADT/StringRef.h"
  19 #include "llvm/Support/SourceMgr.h"
  20 #include <string>
  21 #include <vector>
  22 #include <utility>
  23
  24 namespace llvm {
  25   class Record;
  26   class DagInit;
  27   class CodeGenTarget;
  28   class StringRef;
  29
  30   class CGIOperandList {
  31   public:
  32     class ConstraintInfo {
  33       enum { None, EarlyClobber, Tied } Kind;
  34       unsigned OtherTiedOperand;
  35     public:
  36       ConstraintInfo() : Kind(None) {}
  37
  38       static ConstraintInfo getEarlyClobber() {
  39         ConstraintInfo I;
  40         I.Kind = EarlyClobber;
  41         I.OtherTiedOperand = 0;
  42         return I;
  43       }
  44
  45       static ConstraintInfo getTied(unsigned Op) {
  46         ConstraintInfo I;
  47         I.Kind = Tied;
  48         I.OtherTiedOperand = Op;
  49         return I;
  50       }
  51
  52       bool isNone() const { return Kind == None; }
  53       bool isEarlyClobber() const { return Kind == EarlyClobber; }
  54       bool isTied() const { return Kind == Tied; }
  55
  56       unsigned getTiedOperand() const {
  57         assert(isTied());
  58         return OtherTiedOperand;
  59       }
  60     };
  61
  62     /// OperandInfo - The information we keep track of for each operand in the
  63     /// operand list for a tablegen instruction.
  64     struct OperandInfo {
  65       /// Rec - The definition this operand is declared as.
  66       ///
  67       Record *Rec;
  68
  69       /// Name - If this operand was assigned a symbolic name, this is it,
  70       /// otherwise, it's empty.
  71       std::string Name;
  72
  73       /// PrinterMethodName - The method used to print operands of this type in
  74       /// the asmprinter.
  75       std::string PrinterMethodName;
  76
  77       /// EncoderMethodName - The method used to get the machine operand value
  78       /// for binary encoding. "getMachineOpValue" by default.
  79       std::string EncoderMethodName;
  80
  81       /// MIOperandNo - Currently (this is meant to be phased out), some logical
  82       /// operands correspond to multiple MachineInstr operands.  In the X86
  83       /// target for example, one address operand is represented as 4
  84       /// MachineOperands.  Because of this, the operand number in the
  85       /// OperandList may not match the MachineInstr operand num.  Until it
  86       /// does, this contains the MI operand index of this operand.
  87       unsigned MIOperandNo;
  88       unsigned MINumOperands;   // The number of operands.
  89
  90       /// DoNotEncode - Bools are set to true in this vector for each operand in
  91       /// the DisableEncoding list.  These should not be emitted by the code
  92       /// emitter.
  93       std::vector<bool> DoNotEncode;
  94
  95       /// MIOperandInfo - Default MI operand type. Note an operand may be made
  96       /// up of multiple MI operands.
  97       DagInit *MIOperandInfo;
  98
  99       /// Constraint info for this operand.  This operand can have pieces, so we
 100       /// track constraint info for each.
 101       std::vector<ConstraintInfo> Constraints;
 102
 103       OperandInfo(Record *R, const std::string &N, const std::string &PMN,
 104                   const std::string &EMN, unsigned MION, unsigned MINO,
 105                   DagInit *MIOI)
 106       : Rec(R), Name(N), PrinterMethodName(PMN), EncoderMethodName(EMN),
 107         MIOperandNo(MION), MINumOperands(MINO), MIOperandInfo(MIOI) {}
 108
 109
 110       /// getTiedOperand - If this operand is tied to another one, return the
 111       /// other operand number.  Otherwise, return -1.
 112       int getTiedRegister() const {
 113         for (unsigned j = 0, e = Constraints.size(); j != e; ++j) {
 114           const CGIOperandList::ConstraintInfo &CI = Constraints[j];
 115           if (CI.isTied()) return CI.getTiedOperand();
 116         }
 117         return -1;
 118       }
 119     };
 120
 121     CGIOperandList(Record *D);
 122
 123     Record *TheDef;            // The actual record containing this OperandList.
 124
 125     /// NumDefs - Number of def operands declared, this is the number of
 126     /// elements in the instruction's (outs) list.
 127     ///
 128     unsigned NumDefs;
 129
 130     /// OperandList - The list of declared operands, along with their declared
 131     /// type (which is a record).
 132     std::vector<OperandInfo> OperandList;
 133
 134     // Information gleaned from the operand list.
 135     bool isPredicable;
 136     bool hasOptionalDef;
 137     bool isVariadic;
 138
 139     // Provide transparent accessors to the operand list.
 140     unsigned size() const { return OperandList.size(); }
 141     const OperandInfo &operator[](unsigned i) const { return OperandList[i]; }
 142     OperandInfo &operator[](unsigned i) { return OperandList[i]; }
 143     OperandInfo &back() { return OperandList.back(); }
 144     const OperandInfo &back() const { return OperandList.back(); }
 145
 146
 147     /// getOperandNamed - Return the index of the operand with the specified
 148     /// non-empty name.  If the instruction does not have an operand with the
 149     /// specified name, throw an exception.
 150     unsigned getOperandNamed(StringRef Name) const;
 151
 152     /// hasOperandNamed - Query whether the instruction has an operand of the
 153     /// given name. If so, return true and set OpIdx to the index of the
 154     /// operand. Otherwise, return false.
 155     bool hasOperandNamed(StringRef Name, unsigned &OpIdx) const;
 156
 157     /// ParseOperandName - Parse an operand name like "$foo" or "$foo.bar",
 158     /// where $foo is a whole operand and $foo.bar refers to a suboperand.
 159     /// This throws an exception if the name is invalid.  If AllowWholeOp is
 160     /// true, references to operands with suboperands are allowed, otherwise
 161     /// not.
 162     std::pair<unsigned,unsigned> ParseOperandName(const std::string &Op,
 163                                                   bool AllowWholeOp = true);
 164
 165     /// getFlattenedOperandNumber - Flatten a operand/suboperand pair into a
 166     /// flat machineinstr operand #.
 167     unsigned getFlattenedOperandNumber(std::pair<unsigned,unsigned> Op) const {
 168       return OperandList[Op.first].MIOperandNo + Op.second;
 169     }
 170
 171     /// getSubOperandNumber - Unflatten a operand number into an
 172     /// operand/suboperand pair.
 173     std::pair<unsigned,unsigned> getSubOperandNumber(unsigned Op) const {
 174       for (unsigned i = 0; ; ++i) {
 175         assert(i < OperandList.size() && "Invalid flat operand #");
 176         if (OperandList[i].MIOperandNo+OperandList[i].MINumOperands > Op)
 177           return std::make_pair(i, Op-OperandList[i].MIOperandNo);
 178       }
 179     }
 180
 181
 182     /// isFlatOperandNotEmitted - Return true if the specified flat operand #
 183     /// should not be emitted with the code emitter.
 184     bool isFlatOperandNotEmitted(unsigned FlatOpNo) const {
 185       std::pair<unsigned,unsigned> Op = getSubOperandNumber(FlatOpNo);
 186       if (OperandList[Op.first].DoNotEncode.size() > Op.second)
 187         return OperandList[Op.first].DoNotEncode[Op.second];
 188       return false;
 189     }
 190
 191     void ProcessDisableEncoding(std::string Value);
 192   };
 193
 194
 195   class CodeGenInstruction {
 196   public:
 197     Record *TheDef;            // The actual record defining this instruction.
 198     std::string Namespace;     // The namespace the instruction is in.
 199
 200     /// AsmString - The format string used to emit a .s file for the
 201     /// instruction.
 202     std::string AsmString;
 203
 204     /// Operands - This is information about the (ins) and (outs) list specified
 205     /// to the instruction.
 206     CGIOperandList Operands;
 207
 208     /// ImplicitDefs/ImplicitUses - These are lists of registers that are
 209     /// implicitly defined and used by the instruction.
 210     std::vector<Record*> ImplicitDefs, ImplicitUses;
 211
 212     // Various boolean values we track for the instruction.
 213     bool isReturn;
 214     bool isBranch;
 215     bool isIndirectBranch;
 216     bool isCompare;
 217     bool isMoveImm;
 218     bool isBarrier;
 219     bool isCall;
 220     bool canFoldAsLoad;
 221     bool mayLoad, mayStore;
 222     bool isPredicable;
 223     bool isConvertibleToThreeAddress;
 224     bool isCommutable;
 225     bool isTerminator;
 226     bool isReMaterializable;
 227     bool hasDelaySlot;
 228     bool usesCustomInserter;
 229     bool hasCtrlDep;
 230     bool isNotDuplicable;
 231     bool hasSideEffects;
 232     bool neverHasSideEffects;
 233     bool isAsCheapAsAMove;
 234     bool hasExtraSrcRegAllocReq;
 235     bool hasExtraDefRegAllocReq;
 236
 237
 238     CodeGenInstruction(Record *R);
 239
 240     /// HasOneImplicitDefWithKnownVT - If the instruction has at least one
 241     /// implicit def and it has a known VT, return the VT, otherwise return
 242     /// MVT::Other.
 243     MVT::SimpleValueType
 244       HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const;
 245
 246
 247     /// FlattenAsmStringVariants - Flatten the specified AsmString to only
 248     /// include text from the specified variant, returning the new string.
 249     static std::string FlattenAsmStringVariants(StringRef AsmString,
 250                                                 unsigned Variant);
 251   };
 252
 253
 254   /// CodeGenInstAlias - This represents an InstAlias definition.
 255   class CodeGenInstAlias {
 256   public:
 257     Record *TheDef;            // The actual record defining this InstAlias.
 258
 259     /// AsmString - The format string used to emit a .s file for the
 260     /// instruction.
 261     std::string AsmString;
 262
 263     /// Result - The result instruction.
 264     DagInit *Result;
 265
 266     /// ResultInst - The instruction generated by the alias (decoded from
 267     /// Result).
 268     CodeGenInstruction *ResultInst;
 269
 270
 271     struct ResultOperand {
 272     private:
 273       StringRef Name;
 274       Record *R;
 275
 276       int64_t Imm;
 277     public:
 278       enum {
 279         K_Record,
 280         K_Imm,
 281         K_Reg
 282       } Kind;
 283
 284       ResultOperand(StringRef N, Record *r) : Name(N), R(r), Kind(K_Record) {}
 285       ResultOperand(int64_t I) : Imm(I), Kind(K_Imm) {}
 286       ResultOperand(Record *r) : R(r), Kind(K_Reg) {}
 287
 288       bool isRecord() const { return Kind == K_Record; }
 289       bool isImm() const { return Kind == K_Imm; }
 290       bool isReg() const { return Kind == K_Reg; }
 291
 292       StringRef getName() const { assert(isRecord()); return Name; }
 293       Record *getRecord() const { assert(isRecord()); return R; }
 294       int64_t getImm() const { assert(isImm()); return Imm; }
 295       Record *getRegister() const { assert(isReg()); return R; }
 296     };
 297
 298     /// ResultOperands - The decoded operands for the result instruction.
 299     std::vector<ResultOperand> ResultOperands;
 300
 301     /// ResultInstOperandIndex - For each operand, this vector holds a pair of
 302     /// indices to identify the corresponding operand in the result
 303     /// instruction.  The first index specifies the operand and the second
 304     /// index specifies the suboperand.  If there are no suboperands or if all
 305     /// of them are matched by the operand, the second value should be -1.
 306     std::vector<std::pair<unsigned, int> > ResultInstOperandIndex;
 307
 308     CodeGenInstAlias(Record *R, CodeGenTarget &T);
 309
 310     bool tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo,
 311                          Record *InstOpRec, bool hasSubOps, SMLoc Loc,
 312                          CodeGenTarget &T, ResultOperand &ResOp);
 313   };
 314 }
 315
 316 #endif