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94e5255730
This converts remaining uses of ByteStream, which was still left in the symbol stream and type stream, to using the new StreamInterface zero-copy classes. RecordIterator is finally deleted, so this is the only way left now. Additionally, more error checking is added when iterating the various streams. With this, the transition to zero copy pdb access is complete. llvm-svn: 271101
77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
//===- StreamRef.h - A copyable reference to a stream -----------*- 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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#ifndef LLVM_DEBUGINFO_CODEVIEW_STREAMREF_H
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#define LLVM_DEBUGINFO_CODEVIEW_STREAMREF_H
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#include "llvm/DebugInfo/CodeView/StreamInterface.h"
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namespace llvm {
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namespace codeview {
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class StreamRef : public StreamInterface {
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public:
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StreamRef() : Stream(nullptr), ViewOffset(0), Length(0) {}
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StreamRef(const StreamInterface &Stream)
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: Stream(&Stream), ViewOffset(0), Length(Stream.getLength()) {}
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StreamRef(const StreamInterface &Stream, uint32_t Offset, uint32_t Length)
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: Stream(&Stream), ViewOffset(Offset), Length(Length) {}
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StreamRef(const StreamRef &Other)
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: Stream(Other.Stream), ViewOffset(Other.ViewOffset),
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Length(Other.Length) {}
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Error readBytes(uint32_t Offset, uint32_t Size,
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ArrayRef<uint8_t> &Buffer) const override {
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return Stream->readBytes(ViewOffset + Offset, Size, Buffer);
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}
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uint32_t getLength() const override { return Length; }
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StreamRef drop_front(uint32_t N) const {
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if (!Stream)
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return StreamRef();
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N = std::min(N, Length);
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return StreamRef(*Stream, ViewOffset + N, Length - N);
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}
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StreamRef keep_front(uint32_t N) const {
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if (!Stream)
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return StreamRef();
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N = std::min(N, Length);
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return StreamRef(*Stream, ViewOffset, N);
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}
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bool operator==(const StreamRef &Other) const {
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if (Stream != Other.Stream)
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return false;
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if (ViewOffset != Other.ViewOffset)
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return false;
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if (Length != Other.Length)
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return false;
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return true;
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}
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bool operator!=(const StreamRef &Other) const { return !(*this == Other); }
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StreamRef &operator=(const StreamRef &Other) {
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Stream = Other.Stream;
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ViewOffset = Other.ViewOffset;
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Length = Other.Length;
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return *this;
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}
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private:
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const StreamInterface *Stream;
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uint32_t ViewOffset;
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uint32_t Length;
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};
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}
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}
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#endif // LLVM_DEBUGINFO_CODEVIEW_STREAMREF_H
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