107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
//===- AsmWriterInst.h - Classes encapsulating a printable inst -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// These classes implement a parser for assembly strings. The parser splits
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// the string into operands, which can be literal strings (the constant bits of
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// the string), actual operands (i.e., operands from the MachineInstr), and
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// dynamically-generated text, specified by raw C++ code.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_UTILS_TABLEGEN_ASMWRITERINST_H
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#define LLVM_UTILS_TABLEGEN_ASMWRITERINST_H
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#include <string>
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#include <vector>
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namespace llvm {
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class CodeGenInstruction;
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class Record;
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struct AsmWriterOperand {
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enum OpType {
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// Output this text surrounded by quotes to the asm.
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isLiteralTextOperand,
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// This is the name of a routine to call to print the operand.
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isMachineInstrOperand,
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// Output this text verbatim to the asm writer. It is code that
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// will output some text to the asm.
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isLiteralStatementOperand
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} OperandType;
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/// MiOpNo - For isMachineInstrOperand, this is the operand number of the
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/// machine instruction.
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unsigned MIOpNo;
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/// Str - For isLiteralTextOperand, this IS the literal text. For
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/// isMachineInstrOperand, this is the PrinterMethodName for the operand..
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/// For isLiteralStatementOperand, this is the code to insert verbatim
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/// into the asm writer.
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std::string Str;
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/// MiModifier - For isMachineInstrOperand, this is the modifier string for
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/// an operand, specified with syntax like ${opname:modifier}.
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std::string MiModifier;
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// To make VS STL happy
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AsmWriterOperand(OpType op = isLiteralTextOperand):OperandType(op) {}
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AsmWriterOperand(const std::string &LitStr,
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OpType op = isLiteralTextOperand)
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: OperandType(op), Str(LitStr) {}
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AsmWriterOperand(const std::string &Printer,
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unsigned _MIOpNo,
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const std::string &Modifier,
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OpType op = isMachineInstrOperand)
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: OperandType(op), MIOpNo(_MIOpNo), Str(Printer), MiModifier(Modifier) {}
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bool operator!=(const AsmWriterOperand &Other) const {
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if (OperandType != Other.OperandType || Str != Other.Str) return true;
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if (OperandType == isMachineInstrOperand)
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return MIOpNo != Other.MIOpNo || MiModifier != Other.MiModifier;
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return false;
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}
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bool operator==(const AsmWriterOperand &Other) const {
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return !operator!=(Other);
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}
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/// getCode - Return the code that prints this operand.
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std::string getCode(bool PassSubtarget) const;
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};
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class AsmWriterInst {
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public:
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std::vector<AsmWriterOperand> Operands;
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const CodeGenInstruction *CGI;
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unsigned CGIIndex;
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AsmWriterInst(const CodeGenInstruction &CGI, unsigned CGIIndex,
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unsigned Variant);
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/// MatchesAllButOneOp - If this instruction is exactly identical to the
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/// specified instruction except for one differing operand, return the
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/// differing operand number. Otherwise return ~0.
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unsigned MatchesAllButOneOp(const AsmWriterInst &Other) const;
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private:
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void AddLiteralString(const std::string &Str) {
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// If the last operand was already a literal text string, append this to
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// it, otherwise add a new operand.
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if (!Operands.empty() &&
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Operands.back().OperandType == AsmWriterOperand::isLiteralTextOperand)
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Operands.back().Str.append(Str);
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else
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Operands.push_back(AsmWriterOperand(Str));
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}
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};
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}
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#endif
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