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57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
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//===------------ FixedLenDecoderEmitter.h - Decoder Generator --*- 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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// It contains the tablegen backend that emits the decoder functions for
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// targets with fixed length instruction set.
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//
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//===----------------------------------------------------------------------===//
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#ifndef FixedLenDECODEREMITTER_H
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#define FixedLenDECODEREMITTER_H
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#include "CodeGenTarget.h"
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#include "TableGenBackend.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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struct OperandInfo {
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unsigned FieldBase;
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unsigned FieldLength;
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std::string Decoder;
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OperandInfo(unsigned FB, unsigned FL, std::string D)
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: FieldBase(FB), FieldLength(FL), Decoder(D) { }
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};
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class FixedLenDecoderEmitter : public TableGenBackend {
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public:
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FixedLenDecoderEmitter(RecordKeeper &R) :
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Records(R), Target(R),
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NumberedInstructions(Target.getInstructionsByEnumValue()) {}
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// run - Output the code emitter
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void run(raw_ostream &o);
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private:
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RecordKeeper &Records;
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CodeGenTarget Target;
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std::vector<const CodeGenInstruction*> NumberedInstructions;
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std::vector<unsigned> Opcodes;
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std::map<unsigned, std::vector<OperandInfo> > Operands;
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bool populateInstruction(const CodeGenInstruction &CGI, unsigned Opc);
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void populateInstructions();
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};
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} // end llvm namespace
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#endif
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