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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using Debug = System.Diagnostics.Debug;
namespace Internal.TypeSystem
{
/// <summary>
/// Specifies the target CPU architecture.
/// </summary>
public enum TargetArchitecture
{
Unknown,
ARM,
ARMEL,
ARM64,
X64,
X86,
Wasm32
}
/// <summary>
/// Specifies the target ABI.
/// </summary>
public enum TargetOS
{
Unknown,
Windows,
Linux,
OSX,
FreeBSD,
NetBSD,
WebAssembly,
}
public enum TargetAbi
{
Unknown,
/// <summary>
/// Cross-platform console model
/// </summary>
CoreRT,
/// <summary>
/// Windows-specific UWP model
/// </summary>
ProjectN,
/// <summary>
/// Jit runtime ABI
/// </summary>
Jit
}
/// <summary>
/// Represents various details about the compilation target that affect
/// layout, padding, allocations, or ABI.
/// </summary>
public partial class TargetDetails
{
/// <summary>
/// Gets the target CPU architecture.
/// </summary>
public TargetArchitecture Architecture
{
get;
}
/// <summary>
/// Gets the target ABI.
/// </summary>
public TargetOS OperatingSystem
{
get;
}
public TargetAbi Abi
{
get;
}
/// <summary>
/// Gets the size of a pointer for the target of the compilation.
/// </summary>
public int PointerSize
{
get
{
switch (Architecture)
{
case TargetArchitecture.ARM64:
case TargetArchitecture.X64:
return 8;
case TargetArchitecture.ARM:
case TargetArchitecture.ARMEL:
case TargetArchitecture.X86:
case TargetArchitecture.Wasm32:
return 4;
default:
throw new NotSupportedException();
}
}
}
/// <summary>
/// Gets the maximum alignment to which something can be aligned
/// </summary>
public static int MaximumAlignment
{
get
{
return 8;
}
}
public LayoutInt LayoutPointerSize => new LayoutInt(PointerSize);
/// <summary>
/// Gets the default field packing size.
/// </summary>
public int DefaultPackingSize
{
get
{
// We use default packing size of 8 irrespective of the platform.
return 8;
}
}
/// <summary>
/// Gets the minimum required method alignment.
/// </summary>
public int MinimumFunctionAlignment
{
get
{
// We use a minimum alignment of 4 irrespective of the platform.
return 4;
}
}
public TargetDetails(TargetArchitecture architecture, TargetOS targetOS, TargetAbi abi)
{
Architecture = architecture;
OperatingSystem = targetOS;
Abi = abi;
}
/// <summary>
/// Retrieves the size of a well known type.
/// </summary>
public LayoutInt GetWellKnownTypeSize(DefType type)
{
switch (type.Category)
{
case TypeFlags.Void:
return new LayoutInt(PointerSize);
case TypeFlags.Boolean:
return new LayoutInt(1);
case TypeFlags.Char:
return new LayoutInt(2);
case TypeFlags.Byte:
case TypeFlags.SByte:
return new LayoutInt(1);
case TypeFlags.UInt16:
case TypeFlags.Int16:
return new LayoutInt(2);
case TypeFlags.UInt32:
case TypeFlags.Int32:
return new LayoutInt(4);
case TypeFlags.UInt64:
case TypeFlags.Int64:
return new LayoutInt(8);
case TypeFlags.Single:
return new LayoutInt(4);
case TypeFlags.Double:
return new LayoutInt(8);
case TypeFlags.UIntPtr:
case TypeFlags.IntPtr:
return new LayoutInt(PointerSize);
}
// Add new well known types if necessary
throw new InvalidOperationException();
}
/// <summary>
/// Retrieves the alignment required by a well known type.
/// </summary>
public LayoutInt GetWellKnownTypeAlignment(DefType type)
{
// Size == Alignment for all platforms.
return GetWellKnownTypeSize(type);
}
/// <summary>
/// Given an alignment of the fields of a type, determine the alignment that is necessary for allocating the object on the GC heap
/// </summary>
/// <returns></returns>
public LayoutInt GetObjectAlignment(LayoutInt fieldAlignment)
{
switch (Architecture)
{
case TargetArchitecture.ARM:
case TargetArchitecture.ARMEL:
case TargetArchitecture.Wasm32:
// ARM supports two alignments for objects on the GC heap (4 byte and 8 byte)
if (fieldAlignment.IsIndeterminate)
return LayoutInt.Indeterminate;
if (fieldAlignment.AsInt <= 4)
return new LayoutInt(4);
else
return new LayoutInt(8);
case TargetArchitecture.X64:
case TargetArchitecture.ARM64:
return new LayoutInt(8);
case TargetArchitecture.X86:
return new LayoutInt(4);
default:
throw new NotSupportedException();
}
}
/// <summary>
/// Returns True if compiling for Windows
/// </summary>
public bool IsWindows
{
get
{
return OperatingSystem == TargetOS.Windows;
}
}
/// <summary>
/// Maximum number of elements in a HFA type.
/// </summary>
public int MaximumHfaElementCount
{
get
{
// There is a hard limit of 4 elements on an HFA type, see
// http://blogs.msdn.com/b/vcblog/archive/2013/07/12/introducing-vector-calling-convention.aspx
Debug.Assert(Architecture == TargetArchitecture.ARM ||
Architecture == TargetArchitecture.ARMEL ||
Architecture == TargetArchitecture.ARM64 ||
Architecture == TargetArchitecture.X64 ||
Architecture == TargetArchitecture.X86);
return 4;
}
}
}
}
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