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91d41f9825
Somehow all the functionality to write PDB files got removed, probably accidentally when uploading the patch perhaps the wrong one got uploaded. This re-adds all the code, as well as the corresponding test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274248 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.3 KiB
C++
103 lines
3.3 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/CodeViewError.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 : private 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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// Use StreamRef.slice() instead.
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StreamRef(const StreamRef &S, uint32_t Offset, uint32_t Length) = delete;
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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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if (Size + Offset > Length)
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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return Stream->readBytes(ViewOffset + Offset, Size, Buffer);
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}
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// Given an offset into the stream, read as much as possible without copying
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// any data.
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Error readLongestContiguousChunk(uint32_t Offset,
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ArrayRef<uint8_t> &Buffer) const override {
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if (Offset >= Length)
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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if (auto EC = Stream->readLongestContiguousChunk(Offset, Buffer))
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return EC;
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// This StreamRef might refer to a smaller window over a larger stream. In
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// that case we will have read out more bytes than we should return, because
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// we should not read past the end of the current view.
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uint32_t MaxLength = Length - Offset;
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if (Buffer.size() > MaxLength)
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Buffer = Buffer.slice(0, MaxLength);
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return Error::success();
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}
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Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Data) const override {
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if (Data.size() + Offset > Length)
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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return Stream->writeBytes(ViewOffset + Offset, Data);
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}
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uint32_t getLength() const override { return Length; }
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Error commit() const override { return Stream->commit(); }
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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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StreamRef slice(uint32_t Offset, uint32_t Len) const {
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return drop_front(Offset).keep_front(Len);
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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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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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