Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/Support/BinaryStreamRef.h b/linux-x64/clang/include/llvm/Support/BinaryStreamRef.h
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+++ b/linux-x64/clang/include/llvm/Support/BinaryStreamRef.h
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+//===- BinaryStreamRef.h - A copyable reference to a stream -----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_BINARYSTREAMREF_H
+#define LLVM_SUPPORT_BINARYSTREAMREF_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/Support/BinaryStream.h"
+#include "llvm/Support/BinaryStreamError.h"
+#include "llvm/Support/Error.h"
+#include <algorithm>
+#include <cstdint>
+#include <memory>
+
+namespace llvm {
+
+/// Common stuff for mutable and immutable StreamRefs.
+template <class RefType, class StreamType> class BinaryStreamRefBase {
+protected:
+ BinaryStreamRefBase() = default;
+ explicit BinaryStreamRefBase(StreamType &BorrowedImpl)
+ : BorrowedImpl(&BorrowedImpl), ViewOffset(0) {
+ if (!(BorrowedImpl.getFlags() & BSF_Append))
+ Length = BorrowedImpl.getLength();
+ }
+
+ BinaryStreamRefBase(std::shared_ptr<StreamType> SharedImpl, uint32_t Offset,
+ Optional<uint32_t> Length)
+ : SharedImpl(SharedImpl), BorrowedImpl(SharedImpl.get()),
+ ViewOffset(Offset), Length(Length) {}
+ BinaryStreamRefBase(StreamType &BorrowedImpl, uint32_t Offset,
+ Optional<uint32_t> Length)
+ : BorrowedImpl(&BorrowedImpl), ViewOffset(Offset), Length(Length) {}
+ BinaryStreamRefBase(const BinaryStreamRefBase &Other) = default;
+ BinaryStreamRefBase &operator=(const BinaryStreamRefBase &Other) = default;
+
+ BinaryStreamRefBase &operator=(BinaryStreamRefBase &&Other) = default;
+ BinaryStreamRefBase(BinaryStreamRefBase &&Other) = default;
+
+public:
+ llvm::support::endianness getEndian() const {
+ return BorrowedImpl->getEndian();
+ }
+
+ uint32_t getLength() const {
+ if (Length.hasValue())
+ return *Length;
+
+ return BorrowedImpl ? (BorrowedImpl->getLength() - ViewOffset) : 0;
+ }
+
+ /// Return a new BinaryStreamRef with the first \p N elements removed. If
+ /// this BinaryStreamRef is length-tracking, then the resulting one will be
+ /// too.
+ RefType drop_front(uint32_t N) const {
+ if (!BorrowedImpl)
+ return RefType();
+
+ N = std::min(N, getLength());
+ RefType Result(static_cast<const RefType &>(*this));
+ if (N == 0)
+ return Result;
+
+ Result.ViewOffset += N;
+ if (Result.Length.hasValue())
+ *Result.Length -= N;
+ return Result;
+ }
+
+ /// Return a new BinaryStreamRef with the last \p N elements removed. If
+ /// this BinaryStreamRef is length-tracking and \p N is greater than 0, then
+ /// this BinaryStreamRef will no longer length-track.
+ RefType drop_back(uint32_t N) const {
+ if (!BorrowedImpl)
+ return RefType();
+
+ RefType Result(static_cast<const RefType &>(*this));
+ N = std::min(N, getLength());
+
+ if (N == 0)
+ return Result;
+
+ // Since we're dropping non-zero bytes from the end, stop length-tracking
+ // by setting the length of the resulting StreamRef to an explicit value.
+ if (!Result.Length.hasValue())
+ Result.Length = getLength();
+
+ *Result.Length -= N;
+ return Result;
+ }
+
+ /// Return a new BinaryStreamRef with only the first \p N elements remaining.
+ RefType keep_front(uint32_t N) const {
+ assert(N <= getLength());
+ return drop_back(getLength() - N);
+ }
+
+ /// Return a new BinaryStreamRef with only the last \p N elements remaining.
+ RefType keep_back(uint32_t N) const {
+ assert(N <= getLength());
+ return drop_front(getLength() - N);
+ }
+
+ /// Return a new BinaryStreamRef with the first and last \p N elements
+ /// removed.
+ RefType drop_symmetric(uint32_t N) const {
+ return drop_front(N).drop_back(N);
+ }
+
+ /// Return a new BinaryStreamRef with the first \p Offset elements removed,
+ /// and retaining exactly \p Len elements.
+ RefType slice(uint32_t Offset, uint32_t Len) const {
+ return drop_front(Offset).keep_front(Len);
+ }
+
+ bool valid() const { return BorrowedImpl != nullptr; }
+
+ bool operator==(const RefType &Other) const {
+ if (BorrowedImpl != Other.BorrowedImpl)
+ return false;
+ if (ViewOffset != Other.ViewOffset)
+ return false;
+ if (Length != Other.Length)
+ return false;
+ return true;
+ }
+
+protected:
+ Error checkOffsetForRead(uint32_t Offset, uint32_t DataSize) const {
+ if (Offset > getLength())
+ return make_error<BinaryStreamError>(stream_error_code::invalid_offset);
+ if (getLength() < DataSize + Offset)
+ return make_error<BinaryStreamError>(stream_error_code::stream_too_short);
+ return Error::success();
+ }
+
+ std::shared_ptr<StreamType> SharedImpl;
+ StreamType *BorrowedImpl = nullptr;
+ uint32_t ViewOffset = 0;
+ Optional<uint32_t> Length;
+};
+
+/// \brief BinaryStreamRef is to BinaryStream what ArrayRef is to an Array. It
+/// provides copy-semantics and read only access to a "window" of the underlying
+/// BinaryStream. Note that BinaryStreamRef is *not* a BinaryStream. That is to
+/// say, it does not inherit and override the methods of BinaryStream. In
+/// general, you should not pass around pointers or references to BinaryStreams
+/// and use inheritance to achieve polymorphism. Instead, you should pass
+/// around BinaryStreamRefs by value and achieve polymorphism that way.
+class BinaryStreamRef
+ : public BinaryStreamRefBase<BinaryStreamRef, BinaryStream> {
+ friend BinaryStreamRefBase<BinaryStreamRef, BinaryStream>;
+ friend class WritableBinaryStreamRef;
+ BinaryStreamRef(std::shared_ptr<BinaryStream> Impl, uint32_t ViewOffset,
+ Optional<uint32_t> Length)
+ : BinaryStreamRefBase(Impl, ViewOffset, Length) {}
+
+public:
+ BinaryStreamRef() = default;
+ BinaryStreamRef(BinaryStream &Stream);
+ BinaryStreamRef(BinaryStream &Stream, uint32_t Offset,
+ Optional<uint32_t> Length);
+ explicit BinaryStreamRef(ArrayRef<uint8_t> Data,
+ llvm::support::endianness Endian);
+ explicit BinaryStreamRef(StringRef Data, llvm::support::endianness Endian);
+
+ BinaryStreamRef(const BinaryStreamRef &Other) = default;
+ BinaryStreamRef &operator=(const BinaryStreamRef &Other) = default;
+ BinaryStreamRef(BinaryStreamRef &&Other) = default;
+ BinaryStreamRef &operator=(BinaryStreamRef &&Other) = default;
+
+ // Use BinaryStreamRef.slice() instead.
+ BinaryStreamRef(BinaryStreamRef &S, uint32_t Offset,
+ uint32_t Length) = delete;
+
+ /// Given an Offset into this StreamRef and a Size, return a reference to a
+ /// buffer owned by the stream.
+ ///
+ /// \returns a success error code if the entire range of data is within the
+ /// bounds of this BinaryStreamRef's view and the implementation could read
+ /// the data, and an appropriate error code otherwise.
+ Error readBytes(uint32_t Offset, uint32_t Size,
+ ArrayRef<uint8_t> &Buffer) const;
+
+ /// Given an Offset into this BinaryStreamRef, return a reference to the
+ /// largest buffer the stream could support without necessitating a copy.
+ ///
+ /// \returns a success error code if implementation could read the data,
+ /// and an appropriate error code otherwise.
+ Error readLongestContiguousChunk(uint32_t Offset,
+ ArrayRef<uint8_t> &Buffer) const;
+};
+
+struct BinarySubstreamRef {
+ uint32_t Offset; // Offset in the parent stream
+ BinaryStreamRef StreamData; // Stream Data
+
+ BinarySubstreamRef slice(uint32_t Off, uint32_t Size) const {
+ BinaryStreamRef SubSub = StreamData.slice(Off, Size);
+ return {Off + Offset, SubSub};
+ }
+ BinarySubstreamRef drop_front(uint32_t N) const {
+ return slice(N, size() - N);
+ }
+ BinarySubstreamRef keep_front(uint32_t N) const { return slice(0, N); }
+
+ std::pair<BinarySubstreamRef, BinarySubstreamRef>
+ split(uint32_t Offset) const {
+ return std::make_pair(keep_front(Offset), drop_front(Offset));
+ }
+
+ uint32_t size() const { return StreamData.getLength(); }
+ bool empty() const { return size() == 0; }
+};
+
+class WritableBinaryStreamRef
+ : public BinaryStreamRefBase<WritableBinaryStreamRef,
+ WritableBinaryStream> {
+ friend BinaryStreamRefBase<WritableBinaryStreamRef, WritableBinaryStream>;
+ WritableBinaryStreamRef(std::shared_ptr<WritableBinaryStream> Impl,
+ uint32_t ViewOffset, Optional<uint32_t> Length)
+ : BinaryStreamRefBase(Impl, ViewOffset, Length) {}
+
+ Error checkOffsetForWrite(uint32_t Offset, uint32_t DataSize) const {
+ if (!(BorrowedImpl->getFlags() & BSF_Append))
+ return checkOffsetForRead(Offset, DataSize);
+
+ if (Offset > getLength())
+ return make_error<BinaryStreamError>(stream_error_code::invalid_offset);
+ return Error::success();
+ }
+
+public:
+ WritableBinaryStreamRef() = default;
+ WritableBinaryStreamRef(WritableBinaryStream &Stream);
+ WritableBinaryStreamRef(WritableBinaryStream &Stream, uint32_t Offset,
+ Optional<uint32_t> Length);
+ explicit WritableBinaryStreamRef(MutableArrayRef<uint8_t> Data,
+ llvm::support::endianness Endian);
+ WritableBinaryStreamRef(const WritableBinaryStreamRef &Other) = default;
+ WritableBinaryStreamRef &
+ operator=(const WritableBinaryStreamRef &Other) = default;
+
+ WritableBinaryStreamRef(WritableBinaryStreamRef &&Other) = default;
+ WritableBinaryStreamRef &operator=(WritableBinaryStreamRef &&Other) = default;
+
+ // Use WritableBinaryStreamRef.slice() instead.
+ WritableBinaryStreamRef(WritableBinaryStreamRef &S, uint32_t Offset,
+ uint32_t Length) = delete;
+
+ /// Given an Offset into this WritableBinaryStreamRef and some input data,
+ /// writes the data to the underlying stream.
+ ///
+ /// \returns a success error code if the data could fit within the underlying
+ /// stream at the specified location and the implementation could write the
+ /// data, and an appropriate error code otherwise.
+ Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Data) const;
+
+ /// Conver this WritableBinaryStreamRef to a read-only BinaryStreamRef.
+ operator BinaryStreamRef() const;
+
+ /// \brief For buffered streams, commits changes to the backing store.
+ Error commit();
+};
+
+} // end namespace llvm
+
+#endif // LLVM_SUPPORT_BINARYSTREAMREF_H