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//===------------ FixedLenDecoderEmitter.h - Decoder Generator --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// It contains the tablegen backend that emits the decoder functions for
// targets with fixed length instruction set.
//
//===----------------------------------------------------------------------===//
#ifndef FixedLenDECODEREMITTER_H
#define FixedLenDECODEREMITTER_H
#include "CodeGenTarget.h"
#include "TableGenBackend.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {
struct OperandInfo {
unsigned FieldBase;
unsigned FieldLength;
std::string Decoder;
OperandInfo(unsigned FB, unsigned FL, std::string D)
: FieldBase(FB), FieldLength(FL), Decoder(D) { }
};
class FixedLenDecoderEmitter : public TableGenBackend {
public:
FixedLenDecoderEmitter(RecordKeeper &R) :
Records(R), Target(R),
NumberedInstructions(Target.getInstructionsByEnumValue()) {}
// run - Output the code emitter
void run(raw_ostream &o);
private:
RecordKeeper &Records;
CodeGenTarget Target;
std::vector<const CodeGenInstruction*> NumberedInstructions;
std::vector<unsigned> Opcodes;
std::map<unsigned, std::vector<OperandInfo> > Operands;
bool populateInstruction(const CodeGenInstruction &CGI, unsigned Opc);
void populateInstructions();
};
} // end llvm namespace
#endif
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