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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
OperandTypeAsmWriterOperand57     AsmWriterOperand(OpType op = isLiteralTextOperand):OperandType(op) {}
58 
59     AsmWriterOperand(const std::string &LitStr,
60                      OpType op = isLiteralTextOperand)
OperandTypeAsmWriterOperand61     : 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)
OperandTypeAsmWriterOperand68     : 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:
AddLiteralString(const std::string & Str)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