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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
122 lines
3.8 KiB
C++
122 lines
3.8 KiB
C++
//===-- llvm/CodeGen/ByteStreamer.h - ByteStreamer class --------*- 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 contains a class that can take bytes that would normally be
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// streamed via the AsmPrinter.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
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#include "DIEHash.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/LEB128.h"
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#include <string>
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namespace llvm {
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class ByteStreamer {
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protected:
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~ByteStreamer() = default;
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ByteStreamer(const ByteStreamer&) = default;
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ByteStreamer() = default;
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public:
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// For now we're just handling the calls we need for dwarf emission/hashing.
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virtual void EmitInt8(uint8_t Byte, const Twine &Comment = "") = 0;
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virtual void EmitSLEB128(uint64_t DWord, const Twine &Comment = "") = 0;
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virtual void EmitULEB128(uint64_t DWord, const Twine &Comment = "") = 0;
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};
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class APByteStreamer final : public ByteStreamer {
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private:
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AsmPrinter &AP;
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public:
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APByteStreamer(AsmPrinter &Asm) : AP(Asm) {}
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void EmitInt8(uint8_t Byte, const Twine &Comment) override {
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AP.OutStreamer->AddComment(Comment);
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AP.emitInt8(Byte);
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}
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void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
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AP.OutStreamer->AddComment(Comment);
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AP.EmitSLEB128(DWord);
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}
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void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
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AP.OutStreamer->AddComment(Comment);
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AP.EmitULEB128(DWord);
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}
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};
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class HashingByteStreamer final : public ByteStreamer {
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private:
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DIEHash &Hash;
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public:
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HashingByteStreamer(DIEHash &H) : Hash(H) {}
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void EmitInt8(uint8_t Byte, const Twine &Comment) override {
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Hash.update(Byte);
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}
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void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
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Hash.addSLEB128(DWord);
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}
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void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
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Hash.addULEB128(DWord);
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}
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};
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class BufferByteStreamer final : public ByteStreamer {
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private:
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SmallVectorImpl<char> &Buffer;
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SmallVectorImpl<std::string> &Comments;
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/// Only verbose textual output needs comments. This will be set to
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/// true for that case, and false otherwise. If false, comments passed in to
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/// the emit methods will be ignored.
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bool GenerateComments;
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public:
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BufferByteStreamer(SmallVectorImpl<char> &Buffer,
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SmallVectorImpl<std::string> &Comments,
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bool GenerateComments)
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: Buffer(Buffer), Comments(Comments), GenerateComments(GenerateComments) {}
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void EmitInt8(uint8_t Byte, const Twine &Comment) override {
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Buffer.push_back(Byte);
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if (GenerateComments)
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Comments.push_back(Comment.str());
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}
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void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
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raw_svector_ostream OSE(Buffer);
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unsigned Length = encodeSLEB128(DWord, OSE);
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if (GenerateComments) {
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Comments.push_back(Comment.str());
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// Add some empty comments to keep the Buffer and Comments vectors aligned
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// with each other.
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for (size_t i = 1; i < Length; ++i)
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Comments.push_back("");
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}
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}
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void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
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raw_svector_ostream OSE(Buffer);
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unsigned Length = encodeULEB128(DWord, OSE);
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if (GenerateComments) {
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Comments.push_back(Comment.str());
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// Add some empty comments to keep the Buffer and Comments vectors aligned
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// with each other.
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for (size_t i = 1; i < Length; ++i)
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Comments.push_back("");
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}
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}
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};
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}
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#endif
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