Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Delegate.cs / 2 / Delegate.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System {
using System;
using System.Reflection;
using System.Threading;
using System.Runtime.Serialization;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
[Serializable()]
[ClassInterface(ClassInterfaceType.AutoDual)]
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class Delegate : ICloneable, ISerializable
{
// _target is the object we will invoke on
internal Object _target;
// MethodBase, either cached after first request or assigned from a DynamicMethod
internal MethodBase _methodBase;
// _methodPtr is a pointer to the method we will invoke
// It could be a small thunk if this is a static or UM call
internal IntPtr _methodPtr;
// In the case of a static method passed to a delegate, this field stores
// whatever _methodPtr would have stored: and _methodPtr points to a
// small thunk which removes the "this" pointer before going on
// to _methodPtrAux.
internal IntPtr _methodPtrAux;
// This constructor is called from the class generated by the
// compiler generated code
protected Delegate(Object target,String method)
{
if (target == null)
throw new ArgumentNullException("target");
if (method == null)
throw new ArgumentNullException("method");
// This API existed in v1/v1.1 and only expected to create closed
// instance delegates. Constrain the call to BindToMethodName to
// such and don't allow relaxed signature matching (which could make
// the choice of target method ambiguous) for backwards
// compatibility. The name matching was case sensitive and we
// preserve that as well.
if (!BindToMethodName(target, Type.GetTypeHandle(target), method,
DelegateBindingFlags.InstanceMethodOnly |
DelegateBindingFlags.ClosedDelegateOnly))
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTargMeth"));
}
// This constructor is called from a class to generate a
// delegate based upon a static method name and the Type object
// for the class defining the method.
protected unsafe Delegate(Type target,String method)
{
if (target == null)
throw new ArgumentNullException("target");
if (!(target is RuntimeType))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"), "target");
if (target.IsGenericType && target.ContainsGenericParameters)
throw new ArgumentException(Environment.GetResourceString("Arg_UnboundGenParam"), "target");
if (method == null)
throw new ArgumentNullException("method");
// This API existed in v1/v1.1 and only expected to create open
// static delegates. Constrain the call to BindToMethodName to such
// and don't allow relaxed signature matching (which could make the
// choice of target method ambiguous) for backwards compatibility.
// The name matching was case insensitive (no idea why this is
// different from the constructor above) and we preserve that as
// well.
BindToMethodName(null, target.TypeHandle, method,
DelegateBindingFlags.StaticMethodOnly |
DelegateBindingFlags.OpenDelegateOnly |
DelegateBindingFlags.CaselessMatching);
}
// Protect the default constructor so you can't build a delegate
private Delegate()
{
}
public Object DynamicInvoke(params Object[] args)
{
return DynamicInvokeImpl(args);
}
protected virtual object DynamicInvokeImpl(object[] args)
{
RuntimeMethodHandle method = new RuntimeMethodHandle(GetInvokeMethod());
RuntimeTypeHandle delegateType = Type.GetTypeHandle(this);
RuntimeMethodInfo invoke = (RuntimeMethodInfo)RuntimeType.GetMethodBase(delegateType, method);
return invoke.Invoke(this, BindingFlags.Default, null, args, null, true);
}
public override bool Equals(Object obj)
{
if (obj == null || !InternalEqualTypes(this, obj))
return false;
Delegate d = (Delegate) obj;
// do an optimistic check first. This is hopefully cheap enough to be worth
if (_target == d._target && _methodPtr == d._methodPtr && _methodPtrAux == d._methodPtrAux)
return true;
// even though the fields were not all equals the delegates may still match
// When target carries the delegate itself the 2 targets (delegates) may be different instances
// but the delegates are logically the same
// It may also happen that the method pointer was not jitted when creating one delegate and jitted in the other
// if that's the case the delegates may still be equals but we need to make a more complicated check
if (_methodPtrAux.IsNull())
{
if (!d._methodPtrAux.IsNull())
return false; // different delegate kind
// they are both closed over the first arg
if (_target != d._target)
return false;
// fall through method handle check
}
else
{
if (d._methodPtrAux.IsNull())
return false; // different delegate kind
// Ignore the target as it will be the delegate instance, though it may be a different one
/*
if (_methodPtr != d._methodPtr)
return false;
*/
if (_methodPtrAux == d._methodPtrAux)
return true;
// fall through method handle check
}
// method ptrs don't match, go down long path
//
if (_methodBase == null || d._methodBase == null)
return FindMethodHandle().Equals(d.FindMethodHandle());
else
return _methodBase.Equals(d._methodBase);
}
public override int GetHashCode()
{
//
// this is not right in the face of a method being jitted in one delegate and not in another
// in that case the delegate is the same and Equals will return true but GetHashCode returns a
// different hashcode which is not true.
/*
if (_methodPtrAux.IsNull())
return unchecked((int)((long)this._methodPtr));
else
return unchecked((int)((long)this._methodPtrAux));
*/
return GetType().GetHashCode();
}
public static Delegate Combine(Delegate a, Delegate b)
{
// boundry conditions -- if either (or both) delegates is null
// return the other.
if ((Object)a == null) // cast to object for a more efficient test
return b;
if ((Object)b == null) // cast to object for a more efficient test
return a;
if (!InternalEqualTypes(a, b))
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTypeMis"));
return a.CombineImpl(b);
}
[System.Runtime.InteropServices.ComVisible(true)]
public static Delegate Combine(params Delegate[] delegates)
{
if (delegates == null || delegates.Length == 0)
return null;
Delegate d = delegates[0];
for (int i = 1; i < delegates.Length; i++)
d = Combine(d,delegates[i]);
return d;
}
public virtual Delegate[] GetInvocationList()
{
Delegate[] d = new Delegate[1];
d[0] = this;
return d;
}
// This routine will return the method
public MethodInfo Method
{
get
{
return GetMethodImpl();
}
}
protected virtual MethodInfo GetMethodImpl()
{
if (_methodBase == null)
{
RuntimeMethodHandle method = FindMethodHandle();
RuntimeTypeHandle declaringType = method.GetDeclaringType();
// need a proper declaring type instance method on a generic type
if (declaringType.IsGenericTypeDefinition() || declaringType.HasInstantiation())
{
bool isStatic = (method.GetAttributes() & MethodAttributes.Static) != (MethodAttributes)0;
if (!isStatic)
{
if (_methodPtrAux == (IntPtr)0)
{
// The target may be of a derived type that doesn't have visibility onto the
// target method. We don't want to call RuntimeType.GetMethodBase below with that
// or reflection can end up generating a MethodInfo where the ReflectedType cannot
// see the MethodInfo itself and that breaks an important invariant. But the
// target type could include important generic type information we need in order
// to work out what the exact instantiation of the method's declaring type is. So
// we'll walk up the inheritance chain (which will yield exactly instantiated
// types at each step) until we find the declaring type. Since the declaring type
// we get from the method is probably shared and those in the hierarchy we're
// walking won't be we compare using the generic type definition forms instead.
Type currentType = _target.GetType();
Type targetType = declaringType.GetRuntimeType().GetGenericTypeDefinition();
while (true)
{
if (currentType.IsGenericType &&
currentType.GetGenericTypeDefinition() == targetType)
break;
currentType = currentType.BaseType;
}
declaringType = currentType.TypeHandle;
}
else
{
// it's an open one, need to fetch the first arg of the instantiation
MethodInfo invoke = this.GetType().GetMethod("Invoke");
declaringType = invoke.GetParameters()[0].ParameterType.TypeHandle;
}
}
}
_methodBase = (MethodInfo)RuntimeType.GetMethodBase(declaringType, method);
}
return (MethodInfo)_methodBase;
}
public Object Target
{
get
{
return GetTarget();
}
}
public static Delegate Remove(Delegate source, Delegate value)
{
if (source == null)
return null;
if (value == null)
return source;
if (!InternalEqualTypes(source, value))
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTypeMis"));
return source.RemoveImpl(value);
}
public static Delegate RemoveAll(Delegate source, Delegate value)
{
Delegate newDelegate = null;
do
{
newDelegate = source;
source = Remove(source, value);
}
while (newDelegate != source);
return newDelegate;
}
protected virtual Delegate CombineImpl(Delegate d)
{
throw new MulticastNotSupportedException(Environment.GetResourceString("Multicast_Combine"));
}
protected virtual Delegate RemoveImpl(Delegate d)
{
return (d.Equals(this)) ? null : this;
}
public virtual Object Clone()
{
return MemberwiseClone();
}
// V1 API.
public static Delegate CreateDelegate(Type type, Object target, String method)
{
return CreateDelegate(type, target, method, false, true);
}
// V1 API.
public static Delegate CreateDelegate(Type type, Object target, String method, bool ignoreCase)
{
return CreateDelegate(type, target, method, ignoreCase, true);
}
// V1 API.
public static Delegate CreateDelegate(Type type, Object target, String method, bool ignoreCase, bool throwOnBindFailure)
{
if (type == null)
throw new ArgumentNullException("type");
if (!(type is RuntimeType))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"), "type");
if (target == null)
throw new ArgumentNullException("target");
if (method == null)
throw new ArgumentNullException("method");
Type c = type.BaseType;
if (c == null || c != typeof(MulticastDelegate))
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDelegate"),"type");
Delegate d = InternalAlloc(type.TypeHandle);
// This API existed in v1/v1.1 and only expected to create closed
// instance delegates. Constrain the call to BindToMethodName to such
// and don't allow relaxed signature matching (which could make the
// choice of target method ambiguous) for backwards compatibility.
// We never generate a closed over null delegate and this is
// actually enforced via the check on target above, but we pass
// NeverCloseOverNull anyway just for clarity.
if (!d.BindToMethodName(target, Type.GetTypeHandle(target), method,
DelegateBindingFlags.InstanceMethodOnly |
DelegateBindingFlags.ClosedDelegateOnly |
DelegateBindingFlags.NeverCloseOverNull |
(ignoreCase ? DelegateBindingFlags.CaselessMatching : 0)))
{
if (throwOnBindFailure)
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTargMeth"));
d = null;
}
return d;
}
// V1 API.
public static Delegate CreateDelegate(Type type, Type target, String method)
{
return CreateDelegate(type, target, method, false, true);
}
// V1 API.
public static Delegate CreateDelegate(Type type, Type target, String method, bool ignoreCase)
{
return CreateDelegate(type, target, method, ignoreCase, true);
}
// V1 API.
public static Delegate CreateDelegate(Type type, Type target, String method, bool ignoreCase, bool throwOnBindFailure)
{
if (type == null)
throw new ArgumentNullException("type");
if (!(type is RuntimeType))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"), "type");
if (target == null)
throw new ArgumentNullException("target");
if (!(target is RuntimeType))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"), "target");
if (target.IsGenericType && target.ContainsGenericParameters)
throw new ArgumentException(Environment.GetResourceString("Arg_UnboundGenParam"), "target");
if (method == null)
throw new ArgumentNullException("method");
Type c = type.BaseType;
if (c == null || c != typeof(MulticastDelegate))
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDelegate"),"type");
Delegate d = InternalAlloc(type.TypeHandle);
// This API existed in v1/v1.1 and only expected to create open
// static delegates. Constrain the call to BindToMethodName to such
// and don't allow relaxed signature matching (which could make the
// choice of target method ambiguous) for backwards compatibility.
if (!d.BindToMethodName(null, target.TypeHandle, method,
DelegateBindingFlags.StaticMethodOnly |
DelegateBindingFlags.OpenDelegateOnly |
(ignoreCase ? DelegateBindingFlags.CaselessMatching : 0)))
{
if (throwOnBindFailure)
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTargMeth"));
d = null;
}
return d;
}
// V1 API.
public static Delegate CreateDelegate(Type type, MethodInfo method)
{
return CreateDelegate(type, method, true);
}
// V1 API.
public static Delegate CreateDelegate(Type type, MethodInfo method, bool throwOnBindFailure)
{
// Validate the parameters.
if (type == null)
throw new ArgumentNullException("type");
if (!(type is RuntimeType))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"), "type");
if (method == null)
throw new ArgumentNullException("method");
if (!(method is RuntimeMethodInfo))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeMethodInfo"), "method");
Type c = type.BaseType;
if (c == null || c != typeof(MulticastDelegate))
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDelegate"),"type");
// Initialize the delegate...
Delegate d = InternalAlloc(type.TypeHandle);
// This API existed in v1/v1.1 and only expected to create closed
// instance delegates. Constrain the call to BindToMethodInfo to
// open delegates only for backwards compatibility. But we'll allow
// relaxed signature checking and open static delegates because
// there's no ambiguity there (the caller would have to explicitly
// pass us a static method or a method with a non-exact signature
// and the only change in behavior from v1.1 there is that we won't
// fail the call).
if (!d.BindToMethodInfo(null, method.MethodHandle, method.DeclaringType.TypeHandle,
DelegateBindingFlags.OpenDelegateOnly |
DelegateBindingFlags.RelaxedSignature))
{
if (throwOnBindFailure)
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTargMeth"));
d = null;
}
return d;
}
// V2 API.
public static Delegate CreateDelegate(Type type, Object firstArgument, MethodInfo method)
{
return CreateDelegate(type, firstArgument, method, true);
}
// V2 API.
public static Delegate CreateDelegate(Type type, Object firstArgument, MethodInfo method, bool throwOnBindFailure)
{
// Validate the parameters.
if (type == null)
throw new ArgumentNullException("type");
if (!(type is RuntimeType))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"), "type");
if (method == null)
throw new ArgumentNullException("method");
if (!(method is RuntimeMethodInfo))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeMethodInfo"), "method");
Type c = type.BaseType;
if (c == null || c != typeof(MulticastDelegate))
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDelegate"),"type");
// Initialize the method...
Delegate d = InternalAlloc(type.TypeHandle);
// This API is new in Whidbey and allows the full range of delegate
// flexability (open or closed delegates binding to static or
// instance methods with relaxed signature checking. The delegate
// can also be closed over null. There's no ambiguity with all these
// options since the caller is providing us a specific MethodInfo.
if (!d.BindToMethodInfo(firstArgument, method.MethodHandle, method.DeclaringType.TypeHandle,
DelegateBindingFlags.RelaxedSignature))
{
if (throwOnBindFailure)
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTargMeth"));
d = null;
}
return d;
}
public static bool operator ==(Delegate d1, Delegate d2)
{
if ((Object)d1 == null)
return (Object)d2 == null;
return d1.Equals(d2);
}
public static bool operator != (Delegate d1, Delegate d2)
{
if ((Object)d1 == null)
return (Object)d2 != null;
return !d1.Equals(d2);
}
//
// Implementation of ISerializable
//
public virtual void GetObjectData(SerializationInfo info, StreamingContext context)
{
throw new NotSupportedException();
}
//
// internal implementation details (FCALLS and utilities)
//
// V2 internal API.
internal unsafe static Delegate CreateDelegate(Type type, Object target, RuntimeMethodHandle method)
{
// Validate the parameters.
if (type == null)
throw new ArgumentNullException("type");
if (!(type is RuntimeType))
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeType"), "type");
if (method.IsNullHandle())
throw new ArgumentNullException("method");
Type c = type.BaseType;
if (c == null || c != typeof(MulticastDelegate))
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDelegate"),"type");
// Initialize the method...
Delegate d = InternalAlloc(type.TypeHandle);
// This is a new internal API added in Whidbey. Currently it's only
// used by the dynamic method code to generate a wrapper delegate.
// Allow flexible binding options since the target method is
// unambiguously provided to us.
// <
if (!d.BindToMethodInfo(target, method, method.GetDeclaringType(), DelegateBindingFlags.RelaxedSignature))
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTargMeth"));
return d;
}
// Caution: this method is intended for deserialization only, no security checks are performed.
internal static Delegate InternalCreateDelegate(Type type, Object firstArgument, MethodInfo method)
{
// Validate the parameters.
if (type == null)
throw new ArgumentNullException("type");
if (method == null)
throw new ArgumentNullException("method");
Type c = type.BaseType;
if (c == null || c != typeof(MulticastDelegate))
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDelegate"),"type");
// Initialize the method...
Delegate d = InternalAlloc(type.TypeHandle);
// This API is used by the formatters when deserializing a delegate.
// They pass us the specific target method (that was already the
// target in a valid delegate) so we should bind with the most
// relaxed rules available (the result will never be ambiguous, it
// just increases the chance of success with minor (compatible)
// signature changes). We explicitly skip security checks here --
// we're not really constructing a delegate, we're cloning an
// existing instance which already passed its checks.
if (!d.BindToMethodInfo(firstArgument, method.MethodHandle, method.DeclaringType.TypeHandle,
DelegateBindingFlags.SkipSecurityChecks |
DelegateBindingFlags.RelaxedSignature))
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTargMeth"));
return d;
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern bool BindToMethodName(Object target, RuntimeTypeHandle methodType, String method, DelegateBindingFlags flags);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern bool BindToMethodInfo(Object target, RuntimeMethodHandle method, RuntimeTypeHandle methodType, DelegateBindingFlags flags);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern static MulticastDelegate InternalAlloc(RuntimeTypeHandle type);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern static MulticastDelegate InternalAllocLike(Delegate d);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern static bool InternalEqualTypes(object a, object b);
// Used by the ctor. Do not call directly.
// The name of this function will appear in managed stacktraces as delegate constructor.
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern void DelegateConstruct(Object target, IntPtr slot);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern IntPtr GetMulticastInvoke();
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern IntPtr GetInvokeMethod();
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern RuntimeMethodHandle FindMethodHandle();
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern IntPtr GetUnmanagedCallSite();
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern IntPtr AdjustTarget(Object target, IntPtr methodPtr);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern IntPtr GetCallStub(IntPtr methodPtr);
internal virtual Object GetTarget()
{
return (_methodPtrAux.IsNull()) ? _target : null;
}
#if IA64
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal extern static bool CompareUnmanagedFunctionPtrs (Delegate d1, Delegate d2);
#endif
}
// These flags effect the way BindToMethodInfo and BindToMethodName are allowed to bind a delegate to a target method. Their
// values must be kept in sync with the definition in vm\comdelegate.h.
internal enum DelegateBindingFlags
{
StaticMethodOnly = 0x00000001, // Can only bind to static target methods
InstanceMethodOnly = 0x00000002, // Can only bind to instance (including virtual) methods
OpenDelegateOnly = 0x00000004, // Only allow the creation of delegates open over the 1st argument
ClosedDelegateOnly = 0x00000008, // Only allow the creation of delegates closed over the 1st argument
NeverCloseOverNull = 0x00000010, // A null target will never been considered as a possible null 1st argument
CaselessMatching = 0x00000020, // Use case insensitive lookup for methods matched by name
SkipSecurityChecks = 0x00000040, // Skip security checks (visibility, link demand etc.)
RelaxedSignature = 0x00000080, // Allow relaxed signature matching (co/contra variance)
}
}
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