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ExtensionMethods.cs
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ExtensionMethods.cs
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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
namespace Sigil.Impl
{
internal static class ExtensionMethods
{
public static bool IsTailableCall(OpCode op)
{
return
op == OpCodes.Call ||
//op == OpCodes.Calli ||
op == OpCodes.Callvirt;
}
public static bool StartsWithVowel(string str)
{
var c = char.ToLower(str[0]);
return "aeiou".IndexOf(c) != -1;
}
public static bool IsVolatile(FieldInfo field)
{
// field builder doesn't implement GetRequiredCustomModifiers
if (field is FieldBuilder) return false;
return Array.IndexOf(field.GetRequiredCustomModifiers(), typeof(System.Runtime.CompilerServices.IsVolatile)) >= 0;
}
public static bool IsPrefix(OpCode op)
{
return
op == OpCodes.Tailcall ||
op == OpCodes.Readonly ||
op == OpCodes.Volatile ||
op == OpCodes.Unaligned;
}
private static Dictionary<Type, Type> _AliasCache = new Dictionary<Type, Type>
{
{ typeof(bool), typeof(int) },
{ typeof(sbyte), typeof(int) },
{ typeof(byte), typeof(int) },
{ typeof(short), typeof(int) },
{ typeof(ushort), typeof(int) },
{ typeof(uint), typeof(int) },
{ typeof(ulong), typeof(long) },
{ typeof(IntPtr), typeof(NativeIntType) },
{ typeof(UIntPtr), typeof(NativeIntType) }
};
private static Type Alias(Type t)
{
if (TypeHelpers.IsValueType(t) && TypeHelpers.IsEnum(t))
{
return Alias(Enum.GetUnderlyingType(t));
}
Type ret;
if (!_AliasCache.TryGetValue(t, out ret)) ret = t;
return ret;
}
public static bool IsAssignableFrom(Type type1, TypeOnStack type2)
{
return TypeOnStack.Get(type1).IsAssignableFrom(type2);
}
public static bool IsAssignableFrom(TypeOnStack type1, TypeOnStack type2)
{
// wildcards match *everything*
if (type1 == TypeOnStack.Get<WildcardType>() || type2 == TypeOnStack.Get<WildcardType>()) return true;
if (type1.IsArray && type2.IsArray)
{
if (type1.Type.GetArrayRank() == type2.Type.GetArrayRank())
{
var t1Elem = type1.Type.GetElementType();
var t2Elem = type2.Type.GetElementType();
while (t1Elem.HasElementType) t1Elem = t1Elem.GetElementType();
while (t2Elem.HasElementType) t2Elem = t2Elem.GetElementType();
if (t1Elem == typeof(WildcardType) || t2Elem == typeof(WildcardType)) return true;
}
}
if (type1.IsPointer && type2.IsPointer)
{
if (type1.Type.GetElementType() == typeof(WildcardType) || type2.Type.GetElementType() == typeof(WildcardType)) return true;
}
if (type1.IsReference && type2.IsReference)
{
if (type1.Type.GetElementType() == typeof(WildcardType) || type2.Type.GetElementType() == typeof(WildcardType)) return true;
}
// any pointer type matches, well, any pointer
if (type1.Type == typeof(AnyPointerType) && type2.IsPointer) return true;
if (type2.Type == typeof(AnyPointerType) && type1.IsPointer) return true;
// likewise for any by ref
if (type1.Type == typeof(AnyByRefType) && type2.IsReference) return true;
if (type2.Type == typeof(AnyByRefType) && type1.IsReference) return true;
// Native int can be convereted to any pointer type
if (type1.IsPointer && type2 == TypeOnStack.Get<NativeIntType>()) return true;
if (type2.IsPointer && type1 == TypeOnStack.Get<NativeIntType>()) return true;
if ((type1.IsPointer || type1.IsReference) && !(type2.IsPointer || type2.IsReference)) return false;
if ((type2.IsPointer || type2.IsReference) && !(type1.IsPointer || type1.IsReference)) return false;
if (type1.IsPointer || type1.IsReference)
{
return type1.Type.GetElementType() == type2.Type.GetElementType();
}
var t1 = type1.Type;
var t2 = type2.Type;
// The null type can be assigned to any reference type
if (t1 == typeof(NullType) && !TypeHelpers.IsValueType(t2)) return true;
if (t2 == typeof(NullType) && !TypeHelpers.IsValueType(t1)) return true;
t1 = Alias(t1);
t2 = Alias(t2);
return ReallyIsAssignableFrom(t1, t2);
}
private static LinqList<Type> GetBases(Type t)
{
if (TypeHelpers.IsValueType(t)) return new LinqList<Type>();
var ret = new LinqList<Type>();
t = TypeHelpers.GetBaseType(t);
while (t != null)
{
ret.Add(t);
t = TypeHelpers.GetBaseType(t);
}
return ret;
}
private static bool ReallyIsAssignableFrom(Type t1, Type t2)
{
if (t1 == t2) return true;
if (t1 == typeof(OnlyObjectType))
{
if (t2 == typeof(object)) return true;
return false;
}
// quick and dirty base case
if (t1 == typeof(object) && !TypeHelpers.IsValueType(t2)) return true;
// you have to box in this case
if (t1 == typeof(object) && TypeHelpers.IsValueType(t2)) return false;
var t1Bases = GetBases(t1);
var t2Bases = GetBases(t2);
if (t2Bases.Any(t2b => TypeOnStack.Get(t1).IsAssignableFrom(TypeOnStack.Get(t2b)))) return true;
if (TypeHelpers.IsInterface(t1))
{
var t2Interfaces = (LinqArray<Type>)t2.GetInterfaces();
return t2Interfaces.Any(t2i => TypeOnStack.Get(t1).IsAssignableFrom(TypeOnStack.Get(t2i)));
}
if (TypeHelpers.IsGenericType(t1) && TypeHelpers.IsGenericType(t2))
{
var t1Def = t1.GetGenericTypeDefinition();
var t2Def = t2.GetGenericTypeDefinition();
if (t1Def != t2Def) return false;
var t1Args = t1.GetGenericArguments();
var t2Args = t2.GetGenericArguments();
for (var i = 0; i < t1Args.Length; i++)
{
if (!TypeOnStack.Get(t1Args[i]).IsAssignableFrom(TypeOnStack.Get(t2Args[i]))) return false;
}
return true;
}
try
{
return t1.IsAssignableFrom(t2);
}
catch (NotSupportedException)
{
// Builders, some generic types, and so on don't implement this; just assume it's *no good* for now
return false;
}
}
}
}