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43247f1977
Some functions return concrete ByteStreamers by value - explicitly support that in the base class. (dtor can be virtual, no one seems to be polymorphically owning/destroying them) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243897 91177308-0d34-0410-b5e6-96231b3b80d8
112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
//===-- llvm/CodeGen/ByteStreamer.h - ByteStreamer class --------*- 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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// 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/ADT/ArrayRef.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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/// \brief 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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encodeSLEB128(DWord, OSE);
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if (GenerateComments)
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Comments.push_back(Comment.str());
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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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encodeULEB128(DWord, OSE);
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if (GenerateComments)
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Comments.push_back(Comment.str());
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}
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};
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}
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#endif
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