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 114
