fa3d789df1
Refactor of the llvm-tblgen source into: - a "Basic" library, which contains the bare minimum utilities to build `llvm-min-tablegen` - a "Common" library which contains all of the helpers for TableGen backends. Such helpers can be shared by more than one backend, and even unit tested (e.g. CodeExpander is, maybe we can add more over time) Fixes #80647
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
//===- VarLenCodeEmitterGen.h - CEG for variable-length insts ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declare the CodeEmitterGen component for variable-length
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// instructions. See the .cpp file for more details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_UTILS_TABLEGEN_VARLENCODEEMITTERGEN_H
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#define LLVM_UTILS_TABLEGEN_VARLENCODEEMITTERGEN_H
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#include "llvm/TableGen/Record.h"
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namespace llvm {
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struct EncodingSegment {
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unsigned BitWidth;
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const Init *Value;
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StringRef CustomEncoder = "";
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StringRef CustomDecoder = "";
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};
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class VarLenInst {
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const RecordVal *TheDef;
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size_t NumBits;
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// Set if any of the segment is not fixed value.
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bool HasDynamicSegment;
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SmallVector<EncodingSegment, 4> Segments;
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void buildRec(const DagInit *DI);
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public:
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VarLenInst() : TheDef(nullptr), NumBits(0U), HasDynamicSegment(false) {}
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explicit VarLenInst(const DagInit *DI, const RecordVal *TheDef);
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/// Number of bits
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size_t size() const { return NumBits; }
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using const_iterator = decltype(Segments)::const_iterator;
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const_iterator begin() const { return Segments.begin(); }
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const_iterator end() const { return Segments.end(); }
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size_t getNumSegments() const { return Segments.size(); }
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bool isFixedValueOnly() const { return !HasDynamicSegment; }
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};
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void emitVarLenCodeEmitter(RecordKeeper &R, raw_ostream &OS);
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} // end namespace llvm
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#endif
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