utils/TableGen/AsmWriterInst.h

   1 //===- AsmWriterInst.h - Classes encapsulating a printable inst -*- 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 // These classes implement a parser for assembly strings.  The parser splits
  11 // the string into operands, which can be literal strings (the constant bits of
  12 // the string), actual operands (i.e., operands from the MachineInstr), and
  13 // dynamically-generated text, specified by raw C++ code.
  14 //
  15 //===----------------------------------------------------------------------===//
  16
  17 #ifndef ASMWRITER_INST_H
  18 #define ASMWRITER_INST_H
  19
  20 #include <string>
  21 #include <vector>
  22
  23 namespace llvm {
  24   class CodeGenInstruction;
  25   class Record;
  26
  27   struct AsmWriterOperand {
  28     enum OpType {
  29       // Output this text surrounded by quotes to the asm.
  30       isLiteralTextOperand,
  31       // This is the name of a routine to call to print the operand.
  32       isMachineInstrOperand,
  33       // Output this text verbatim to the asm writer.  It is code that
  34       // will output some text to the asm.
  35       isLiteralStatementOperand
  36     } OperandType;
  37
  38     /// Str - For isLiteralTextOperand, this IS the literal text.  For
  39     /// isMachineInstrOperand, this is the PrinterMethodName for the operand..
  40     /// For isLiteralStatementOperand, this is the code to insert verbatim
  41     /// into the asm writer.
  42     std::string Str;
  43
  44     /// CGIOpNo - For isMachineInstrOperand, this is the index of the operand in
  45     /// the CodeGenInstruction.
  46     unsigned CGIOpNo;
  47
  48     /// MiOpNo - For isMachineInstrOperand, this is the operand number of the
  49     /// machine instruction.
  50     unsigned MIOpNo;
  51
  52     /// MiModifier - For isMachineInstrOperand, this is the modifier string for
  53     /// an operand, specified with syntax like ${opname:modifier}.
  54     std::string MiModifier;
  55
  56     // To make VS STL happy
  57     AsmWriterOperand(OpType op = isLiteralTextOperand):OperandType(op) {}
  58
  59     AsmWriterOperand(const std::string &LitStr,
  60                      OpType op = isLiteralTextOperand)
  61     : OperandType(op), Str(LitStr) {}
  62
  63     AsmWriterOperand(const std::string &Printer,
  64                      unsigned _CGIOpNo,
  65                      unsigned _MIOpNo,
  66                      const std::string &Modifier,
  67                      OpType op = isMachineInstrOperand)
  68     : OperandType(op), Str(Printer), CGIOpNo(_CGIOpNo), MIOpNo(_MIOpNo),
  69     MiModifier(Modifier) {}
  70
  71     bool operator!=(const AsmWriterOperand &Other) const {
  72       if (OperandType != Other.OperandType || Str != Other.Str) return true;
  73       if (OperandType == isMachineInstrOperand)
  74         return MIOpNo != Other.MIOpNo || MiModifier != Other.MiModifier;
  75       return false;
  76     }
  77     bool operator==(const AsmWriterOperand &Other) const {
  78       return !operator!=(Other);
  79     }
  80
  81     /// getCode - Return the code that prints this operand.
  82     std::string getCode() const;
  83   };
  84
  85   class AsmWriterInst {
  86   public:
  87     std::vector<AsmWriterOperand> Operands;
  88     const CodeGenInstruction *CGI;
  89
  90     AsmWriterInst(const CodeGenInstruction &CGI,
  91                   unsigned Variant,
  92                   int FirstOperandColumn,
  93                   int OperandSpacing);
  94
  95     /// MatchesAllButOneOp - If this instruction is exactly identical to the
  96     /// specified instruction except for one differing operand, return the
  97     /// differing operand number.  Otherwise return ~0.
  98     unsigned MatchesAllButOneOp(const AsmWriterInst &Other) const;
  99
 100   private:
 101     void AddLiteralString(const std::string &Str) {
 102       // If the last operand was already a literal text string, append this to
 103       // it, otherwise add a new operand.
 104       if (!Operands.empty() &&
 105           Operands.back().OperandType == AsmWriterOperand::isLiteralTextOperand)
 106         Operands.back().Str.append(Str);
 107       else
 108         Operands.push_back(AsmWriterOperand(Str));
 109     }
 110   };
 111 }
 112
 113 #endif