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83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
//===------------ 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 "llvm/TableGen/TableGenBackend.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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struct EncodingField {
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unsigned Base, Width, Offset;
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EncodingField(unsigned B, unsigned W, unsigned O)
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: Base(B), Width(W), Offset(O) { }
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};
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struct OperandInfo {
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std::vector<EncodingField> Fields;
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std::string Decoder;
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OperandInfo(std::string D)
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: Decoder(D) { }
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void addField(unsigned Base, unsigned Width, unsigned Offset) {
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Fields.push_back(EncodingField(Base, Width, Offset));
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}
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unsigned numFields() { return Fields.size(); }
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typedef std::vector<EncodingField>::iterator iterator;
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iterator begin() { return Fields.begin(); }
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iterator end() { return Fields.end(); }
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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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std::string PredicateNamespace,
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std::string GPrefix = "if (",
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std::string GPostfix = " == MCDisassembler::Fail)"
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" return MCDisassembler::Fail;",
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std::string ROK = "MCDisassembler::Success",
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std::string RFail = "MCDisassembler::Fail",
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std::string L = "") :
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Records(R), Target(R),
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NumberedInstructions(Target.getInstructionsByEnumValue()),
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PredicateNamespace(PredicateNamespace),
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GuardPrefix(GPrefix), GuardPostfix(GPostfix),
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ReturnOK(ROK), ReturnFail(RFail), Locals(L) {}
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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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public:
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std::string PredicateNamespace;
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std::string GuardPrefix, GuardPostfix;
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std::string ReturnOK, ReturnFail;
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std::string Locals;
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};
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} // end llvm namespace
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#endif
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