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//===- VarLenCodeEmitterGen.h - CEG for variable-length insts ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declare the CodeEmitterGen component for variable-length
// instructions. See the .cpp file for more details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_UTILS_TABLEGEN_VARLENCODEEMITTERGEN_H
#define LLVM_UTILS_TABLEGEN_VARLENCODEEMITTERGEN_H
#include "llvm/TableGen/Record.h"
namespace llvm {
struct EncodingSegment {
unsigned BitWidth;
const Init *Value;
StringRef CustomEncoder = "";
StringRef CustomDecoder = "";
};
class VarLenInst {
const RecordVal *TheDef;
size_t NumBits;
// Set if any of the segment is not fixed value.
bool HasDynamicSegment;
SmallVector<EncodingSegment, 4> Segments;
void buildRec(const DagInit *DI);
public:
VarLenInst() : TheDef(nullptr), NumBits(0U), HasDynamicSegment(false) {}
explicit VarLenInst(const DagInit *DI, const RecordVal *TheDef);
/// Number of bits
size_t size() const { return NumBits; }
using const_iterator = decltype(Segments)::const_iterator;
const_iterator begin() const { return Segments.begin(); }
const_iterator end() const { return Segments.end(); }
size_t getNumSegments() const { return Segments.size(); }
bool isFixedValueOnly() const { return !HasDynamicSegment; }
};
void emitVarLenCodeEmitter(RecordKeeper &R, raw_ostream &OS);
} // end namespace llvm
#endif
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