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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 Internal.IL;
using Internal.TypeSystem;
using Debug = System.Diagnostics.Debug;
namespace ILCompiler
{
public static class TypeExtensions
{
public static bool IsSealed(this TypeDesc type)
{
var metadataType = type as MetadataType;
if (metadataType != null)
{
return metadataType.IsSealed || metadataType.IsModuleType;
}
Debug.Assert(type.IsArray, "IsSealed on a type with no virtual methods?");
return true;
}
/// <summary>
/// Gets the type that defines virtual method slots for the specified type.
/// </summary>
public static DefType GetClosestDefType(this TypeDesc type)
{
if (type.IsArray)
{
if (type.IsArrayTypeWithoutGenericInterfaces())
return type.Context.GetWellKnownType(WellKnownType.Array);
MetadataType arrayShadowType = type.Context.SystemModule.GetKnownType("System", "Array`1");
return arrayShadowType.MakeInstantiatedType(((ArrayType)type).ElementType);
}
Debug.Assert(type is DefType);
return (DefType)type;
}
/// <summary>
/// Gets a value indicating whether the method requires a hidden instantiation argument in addition
/// to the formal arguments defined in the method signature.
/// </summary>
public static bool RequiresInstArg(this MethodDesc method)
{
return method.IsSharedByGenericInstantiations &&
(method.HasInstantiation || method.Signature.IsStatic || method.ImplementationType.IsValueType);
}
/// <summary>
/// Gets a value indicating whether the method acquires the generic context from a hidden
/// instantiation argument that points to the method's generic dictionary.
/// </summary>
public static bool RequiresInstMethodDescArg(this MethodDesc method)
{
return method.HasInstantiation && method.IsSharedByGenericInstantiations;
}
/// <summary>
/// Gets a value indicating whether the method acquires the generic context from a hidden
/// instantiation argument that points to the generic dictionary of the method's owning type.
/// </summary>
public static bool RequiresInstMethodTableArg(this MethodDesc method)
{
return (method.Signature.IsStatic || method.ImplementationType.IsValueType) &&
method.IsSharedByGenericInstantiations &&
!method.HasInstantiation;
}
/// <summary>
/// Gets a value indicating whether the method acquires the generic context from the this pointer.
/// </summary>
public static bool AcquiresInstMethodTableFromThis(this MethodDesc method)
{
return method.IsSharedByGenericInstantiations &&
!method.HasInstantiation &&
!method.Signature.IsStatic &&
!method.ImplementationType.IsValueType;
}
/// <summary>
/// Returns true if '<paramref name="method"/>' is the "Address" method on multidimensional array types.
/// </summary>
public static bool IsArrayAddressMethod(this MethodDesc method)
{
var arrayMethod = method as ArrayMethod;
return arrayMethod != null && arrayMethod.Kind == ArrayMethodKind.Address;
}
/// <summary>
/// Gets a value indicating whether this type has any generic virtual methods.
/// </summary>
public static bool HasGenericVirtualMethods(this TypeDesc type)
{
foreach (var method in type.GetAllMethods())
{
if (method.IsVirtual && method.HasInstantiation)
return true;
}
return false;
}
/// <summary>
/// Wrapper helper function around the IsCanonicalDefinitionType API on the TypeSystemContext
/// </summary>
public static bool IsCanonicalDefinitionType(this TypeDesc type, CanonicalFormKind kind)
{
return type.Context.IsCanonicalDefinitionType(type, kind);
}
/// <summary>
/// Gets the value of the field ordinal. Ordinals are computed by also including static fields, but excluding
/// literal fields and fields with RVAs.
/// </summary>
public static int GetFieldOrdinal(this FieldDesc inputField)
{
// Make sure we are asking the question for a valid instance or static field
Debug.Assert(!inputField.HasRva && !inputField.IsLiteral);
int fieldOrdinal = 0;
foreach (FieldDesc field in inputField.OwningType.GetFields())
{
// If this field does not contribute to layout, skip
if (field.HasRva || field.IsLiteral)
continue;
if (field == inputField)
return fieldOrdinal;
fieldOrdinal++;
}
Debug.Assert(false);
return -1;
}
/// <summary>
/// What is the maximum number of steps that need to be taken from this type to its most contained generic type.
/// i.e.
/// System.Int32 => 0
/// List<System.Int32> => 1
/// Dictionary<System.Int32,System.Int32> => 1
/// Dictionary<List<System.Int32>,<System.Int32> => 2
/// </summary>
public static int GetGenericDepth(this TypeDesc type)
{
if (type.HasInstantiation)
{
int maxGenericDepthInInstantiation = 0;
foreach (TypeDesc instantiationType in type.Instantiation)
{
maxGenericDepthInInstantiation = Math.Max(instantiationType.GetGenericDepth(), maxGenericDepthInInstantiation);
}
return maxGenericDepthInInstantiation + 1;
}
return 0;
}
/// <summary>
/// Determine if a type has a generic depth greater than a given value
/// </summary>
public static bool IsGenericDepthGreaterThan(this TypeDesc type, int depth)
{
if (depth < 0)
return true;
foreach (TypeDesc instantiationType in type.Instantiation)
{
if (instantiationType.IsGenericDepthGreaterThan(depth - 1))
return true;
}
return false;
}
/// <summary>
/// Determines whether an array type does implements the generic collection interfaces. This is the case
/// for multi-dimensional arrays, and arrays of pointers.
/// </summary>
public static bool IsArrayTypeWithoutGenericInterfaces(this TypeDesc type)
{
if (!type.IsArray)
return false;
var arrayType = (ArrayType)type;
TypeDesc elementType = arrayType.ElementType;
return type.IsMdArray || elementType.IsPointer || elementType.IsFunctionPointer;
}
}
}
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