/// <summary>
/// Returns a reference to the 0th element of the Span. If the Span is empty, returns a reference to the location where the 0th element
- /// would have been stored. Such a reference can be used for pinning but must never be dereferenced.
+ /// would have been stored. Such a reference may or may not be null. It can be used for pinning but must never be dereferenced.
/// </summary>
public static ref T GetReference<T>(Span<T> span) => ref span._pointer.Value;
/// <summary>
- /// Returns a reference to the 0th element of the ReadOnlySpan. If the Span is empty, returns a reference to the location where the 0th element
- /// would have been stored. Such a reference can be used for pinning but must never be dereferenced.
+ /// Returns a reference to the 0th element of the ReadOnlySpan. If the ReadOnlySpan is empty, returns a reference to the location where the 0th element
+ /// would have been stored. Such a reference may or may not be null. It can be used for pinning but must never be dereferenced.
/// </summary>
public static ref T GetReference<T>(ReadOnlySpan<T> span) => ref span._pointer.Value;
/// <summary>
+ /// Returns a reference to the 0th element of the Span. If the Span is empty, returns a reference to fake non-null pointer. Such a reference can be used
+ /// for pinning but must never be dereferenced. This is useful for interop with methods that do not accept null pointers for zero-sized buffers.
+ /// </summary>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ internal static unsafe ref T GetNonNullPinnableReference<T>(Span<T> span) => ref (span.Length != 0) ? ref span._pointer.Value : ref Unsafe.AsRef<T>((void*)1);
+
+ /// <summary>
+ /// Returns a reference to the 0th element of the ReadOnlySpan. If the ReadOnlySpan is empty, returns a reference to fake non-null pointer. Such a reference
+ /// can be used for pinning but must never be dereferenced. This is useful for interop with methods that do not accept null pointers for zero-sized buffers.
+ /// </summary>
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ internal static unsafe ref T GetNonNullPinnableReference<T>(ReadOnlySpan<T> span) => ref (span.Length != 0) ? ref span._pointer.Value : ref Unsafe.AsRef<T>((void*)1);
+
+ /// <summary>
/// Casts a Span of one primitive type <typeparamref name="TFrom"/> to another primitive type <typeparamref name="TTo"/>.
/// These types may not contain pointers or references. This is checked at runtime in order to preserve type safety.
/// </summary>
public virtual unsafe int GetCharCount(ReadOnlySpan<byte> bytes, bool flush)
{
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
{
return GetCharCount(bytesPtr, bytes.Length, flush);
}
public virtual unsafe int GetChars(ReadOnlySpan<byte> bytes, Span<char> chars, bool flush)
{
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
- fixed (char* charsPtr = &MemoryMarshal.GetReference(chars))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
+ fixed (char* charsPtr = &MemoryMarshal.GetNonNullPinnableReference(chars))
{
return GetChars(bytesPtr, bytes.Length, charsPtr, chars.Length, flush);
}
public virtual unsafe void Convert(ReadOnlySpan<byte> bytes, Span<char> chars, bool flush, out int bytesUsed, out int charsUsed, out bool completed)
{
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
- fixed (char* charsPtr = &MemoryMarshal.GetReference(chars))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
+ fixed (char* charsPtr = &MemoryMarshal.GetNonNullPinnableReference(chars))
{
Convert(bytesPtr, bytes.Length, charsPtr, chars.Length, flush, out bytesUsed, out charsUsed, out completed);
}
public virtual unsafe int GetByteCount(ReadOnlySpan<char> chars, bool flush)
{
- fixed (char* charsPtr = &MemoryMarshal.GetReference(chars))
+ fixed (char* charsPtr = &MemoryMarshal.GetNonNullPinnableReference(chars))
{
return GetByteCount(charsPtr, chars.Length, flush);
}
public virtual unsafe int GetBytes(ReadOnlySpan<char> chars, Span<byte> bytes, bool flush)
{
- fixed (char* charsPtr = &MemoryMarshal.GetReference(chars))
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
+ fixed (char* charsPtr = &MemoryMarshal.GetNonNullPinnableReference(chars))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
{
return GetBytes(charsPtr, chars.Length, bytesPtr, bytes.Length, flush);
}
public virtual unsafe void Convert(ReadOnlySpan<char> chars, Span<byte> bytes, bool flush, out int charsUsed, out int bytesUsed, out bool completed)
{
- fixed (char* charsPtr = &MemoryMarshal.GetReference(chars))
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
+ fixed (char* charsPtr = &MemoryMarshal.GetNonNullPinnableReference(chars))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
{
Convert(charsPtr, chars.Length, bytesPtr, bytes.Length, flush, out charsUsed, out bytesUsed, out completed);
}
public virtual unsafe int GetByteCount(ReadOnlySpan<char> chars)
{
- fixed (char* charsPtr = &MemoryMarshal.GetReference(chars))
+ fixed (char* charsPtr = &MemoryMarshal.GetNonNullPinnableReference(chars))
{
return GetByteCount(charsPtr, chars.Length);
}
public virtual unsafe int GetBytes(ReadOnlySpan<char> chars, Span<byte> bytes)
{
- fixed (char* charsPtr = &MemoryMarshal.GetReference(chars))
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
+ fixed (char* charsPtr = &MemoryMarshal.GetNonNullPinnableReference(chars))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
{
return GetBytes(charsPtr, chars.Length, bytesPtr, bytes.Length);
}
public virtual unsafe int GetCharCount(ReadOnlySpan<byte> bytes)
{
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
{
return GetCharCount(bytesPtr, bytes.Length);
}
public virtual unsafe int GetChars(ReadOnlySpan<byte> bytes, Span<char> chars)
{
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
- fixed (char* charsPtr = &MemoryMarshal.GetReference(chars))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
+ fixed (char* charsPtr = &MemoryMarshal.GetNonNullPinnableReference(chars))
{
return GetChars(bytesPtr, bytes.Length, charsPtr, chars.Length);
}
public unsafe string GetString(ReadOnlySpan<byte> bytes)
{
- fixed (byte* bytesPtr = &MemoryMarshal.GetReference(bytes))
+ fixed (byte* bytesPtr = &MemoryMarshal.GetNonNullPinnableReference(bytes))
{
return GetString(bytesPtr, bytes.Length);
}
projects / platform / upstream / coreclr.git / commitdiff