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 <string>
  19 #include <vector>
  20 #include <utility>
  21
  22 namespace llvm {
  23   class Record;
  24   class DagInit;
  25
  26   class CodeGenInstruction {
  27   public:
  28     Record *TheDef;            // The actual record defining this instruction.
  29     std::string Namespace;     // The namespace the instruction is in.
  30
  31     /// AsmString - The format string used to emit a .s file for the
  32     /// instruction.
  33     std::string AsmString;
  34
  35     /// OperandInfo - The information we keep track of for each operand in the
  36     /// operand list for a tablegen instruction.
  37     struct OperandInfo {
  38       /// Rec - The definition this operand is declared as.
  39       ///
  40       Record *Rec;
  41
  42       /// Name - If this operand was assigned a symbolic name, this is it,
  43       /// otherwise, it's empty.
  44       std::string Name;
  45
  46       /// PrinterMethodName - The method used to print operands of this type in
  47       /// the asmprinter.
  48       std::string PrinterMethodName;
  49
  50       /// MIOperandNo - Currently (this is meant to be phased out), some logical
  51       /// operands correspond to multiple MachineInstr operands.  In the X86
  52       /// target for example, one address operand is represented as 4
  53       /// MachineOperands.  Because of this, the operand number in the
  54       /// OperandList may not match the MachineInstr operand num.  Until it
  55       /// does, this contains the MI operand index of this operand.
  56       unsigned MIOperandNo;
  57       unsigned MINumOperands;   // The number of operands.
  58
  59       /// DoNotEncode - Bools are set to true in this vector for each operand in
  60       /// the DisableEncoding list.  These should not be emitted by the code
  61       /// emitter.
  62       std::vector<bool> DoNotEncode;
  63
  64       /// MIOperandInfo - Default MI operand type. Note an operand may be made
  65       /// up of multiple MI operands.
  66       DagInit *MIOperandInfo;
  67
  68       /// Constraint info for this operand.  This operand can have pieces, so we
  69       /// track constraint info for each.
  70       std::vector<std::string> Constraints;
  71
  72       OperandInfo(Record *R, const std::string &N, const std::string &PMN,
  73                   unsigned MION, unsigned MINO, DagInit *MIOI)
  74         : Rec(R), Name(N), PrinterMethodName(PMN), MIOperandNo(MION),
  75           MINumOperands(MINO), MIOperandInfo(MIOI) {}
  76     };
  77
  78     /// NumDefs - Number of def operands declared.
  79     ///
  80     unsigned NumDefs;
  81
  82     /// OperandList - The list of declared operands, along with their declared
  83     /// type (which is a record).
  84     std::vector<OperandInfo> OperandList;
  85
  86     // Various boolean values we track for the instruction.
  87     bool isReturn;
  88     bool isBranch;
  89     bool isIndirectBranch;
  90     bool isBarrier;
  91     bool isCall;
  92     bool canFoldAsLoad;
  93     bool mayLoad, mayStore;
  94     bool isPredicable;
  95     bool isConvertibleToThreeAddress;
  96     bool isCommutable;
  97     bool isTerminator;
  98     bool isReMaterializable;
  99     bool hasDelaySlot;
 100     bool usesCustomDAGSchedInserter;
 101     bool isVariadic;
 102     bool hasCtrlDep;
 103     bool isNotDuplicable;
 104     bool hasOptionalDef;
 105     bool hasSideEffects;
 106     bool mayHaveSideEffects;
 107     bool neverHasSideEffects;
 108     bool isAsCheapAsAMove;
 109
 110     /// ParseOperandName - Parse an operand name like "$foo" or "$foo.bar",
 111     /// where $foo is a whole operand and $foo.bar refers to a suboperand.
 112     /// This throws an exception if the name is invalid.  If AllowWholeOp is
 113     /// true, references to operands with suboperands are allowed, otherwise
 114     /// not.
 115     std::pair<unsigned,unsigned> ParseOperandName(const std::string &Op,
 116                                                   bool AllowWholeOp = true);
 117
 118     /// getFlattenedOperandNumber - Flatten a operand/suboperand pair into a
 119     /// flat machineinstr operand #.
 120     unsigned getFlattenedOperandNumber(std::pair<unsigned,unsigned> Op) const {
 121       return OperandList[Op.first].MIOperandNo + Op.second;
 122     }
 123
 124     /// getSubOperandNumber - Unflatten a operand number into an
 125     /// operand/suboperand pair.
 126     std::pair<unsigned,unsigned> getSubOperandNumber(unsigned Op) const {
 127       for (unsigned i = 0; ; ++i) {
 128         assert(i < OperandList.size() && "Invalid flat operand #");
 129         if (OperandList[i].MIOperandNo+OperandList[i].MINumOperands > Op)
 130           return std::make_pair(i, Op-OperandList[i].MIOperandNo);
 131       }
 132     }
 133
 134
 135     /// isFlatOperandNotEmitted - Return true if the specified flat operand #
 136     /// should not be emitted with the code emitter.
 137     bool isFlatOperandNotEmitted(unsigned FlatOpNo) const {
 138       std::pair<unsigned,unsigned> Op = getSubOperandNumber(FlatOpNo);
 139       if (OperandList[Op.first].DoNotEncode.size() > Op.second)
 140         return OperandList[Op.first].DoNotEncode[Op.second];
 141       return false;
 142     }
 143
 144     CodeGenInstruction(Record *R, const std::string &AsmStr);
 145
 146     /// getOperandNamed - Return the index of the operand with the specified
 147     /// non-empty name.  If the instruction does not have an operand with the
 148     /// specified name, throw an exception.
 149     unsigned getOperandNamed(const std::string &Name) const;
 150   };
 151 }
 152
 153 #endif