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9cc0faee65
Since we want to move toward zero-copy access to stream data, we want to remove all instances of copying operations. So get rid of some of those here. Differential Revision: http://reviews.llvm.org/D20720 Reviewed By: ruiu git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270960 91177308-0d34-0410-b5e6-96231b3b80d8
76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
//===- StreamReader.h - Reads bytes and objects from 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_STREAMREADER_H
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#define LLVM_DEBUGINFO_CODEVIEW_STREAMREADER_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/DebugInfo/CodeView/CodeViewError.h"
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#include "llvm/DebugInfo/CodeView/StreamArray.h"
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#include "llvm/DebugInfo/CodeView/StreamInterface.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Error.h"
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#include <string>
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namespace llvm {
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namespace codeview {
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class StreamRef;
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class StreamReader {
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public:
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StreamReader(const StreamInterface &S);
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Error readBytes(uint32_t Size, ArrayRef<uint8_t> &Buffer);
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Error readInteger(uint16_t &Dest);
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Error readInteger(uint32_t &Dest);
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Error readZeroString(StringRef &Dest);
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Error readFixedString(StringRef &Dest, uint32_t Length);
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Error readStreamRef(StreamRef &Ref);
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Error readStreamRef(StreamRef &Ref, uint32_t Length);
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Error readBytes(MutableArrayRef<uint8_t> Buffer);
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template <typename T> Error readObject(const T *&Dest) {
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ArrayRef<uint8_t> Buffer;
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if (auto EC = readBytes(sizeof(T), Buffer))
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return EC;
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Dest = reinterpret_cast<const T *>(Buffer.data());
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return Error::success();
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}
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template <typename T>
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Error readArray(FixedStreamArray<T> &Array, uint32_t NumItems) {
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if (NumItems == 0) {
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Array = FixedStreamArray<T>();
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return Error::success();
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}
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uint32_t Length = NumItems * sizeof(T);
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if (Offset + Length > Stream.getLength())
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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StreamRef View(Stream, Offset, Length);
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Array = FixedStreamArray<T>(View);
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Offset += Length;
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return Error::success();
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}
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void setOffset(uint32_t Off) { Offset = Off; }
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uint32_t getOffset() const { return Offset; }
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uint32_t getLength() const { return Stream.getLength(); }
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uint32_t bytesRemaining() const { return getLength() - getOffset(); }
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private:
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const StreamInterface &Stream;
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uint32_t Offset;
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};
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} // namespace codeview
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} // namespace llvm
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#endif // LLVM_DEBUGINFO_CODEVIEW_STREAMREADER_H
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