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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System {
using System;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using System.Runtime.Versioning;
using System.Diagnostics.Contracts;
// This class will not be marked serializable
// Note: This type must have the same layout as the CLR's VARARGS type in CLRVarArgs.h.
// It also contains an inline SigPointer data structure - must keep those fields in sync.
[StructLayout(LayoutKind.Sequential)]
public struct ArgIterator
{
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern ArgIterator(IntPtr arglist);
// create an arg iterator that points at the first argument that
// is not statically declared (that is the first ... arg)
// 'arglist' is the value returned by the ARGLIST instruction
[System.Security.SecuritySafeCritical] // auto-generated
public ArgIterator(RuntimeArgumentHandle arglist) : this(arglist.Value)
{
}
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private unsafe extern ArgIterator(IntPtr arglist, void *ptr);
// create an arg iterator that points just past 'firstArg'.
// 'arglist' is the value returned by the ARGLIST instruction
// This is much like the C va_start macro
[System.Security.SecurityCritical] // auto-generated
[CLSCompliant(false)]
public unsafe ArgIterator(RuntimeArgumentHandle arglist, void* ptr) : this(arglist.Value, ptr)
{
}
// Fetch an argument as a typed referece, advance the iterator.
// Throws an exception if past end of argument list
[System.Security.SecuritySafeCritical] // auto-generated
[CLSCompliant(false)]
public TypedReference GetNextArg()
{
TypedReference result = new TypedReference ();
// reference to TypedReference is banned, so have to pass result as pointer
unsafe
{
FCallGetNextArg (&result);
}
return result;
}
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
// reference to TypedReference is banned, so have to pass result as void pointer
private unsafe extern void FCallGetNextArg(void * result);
// Alternate version of GetNextArg() intended primarily for IJW code
// generated by VC's "va_arg()" construct.
[System.Security.SecuritySafeCritical] // auto-generated
[CLSCompliant(false)]
public TypedReference GetNextArg(RuntimeTypeHandle rth)
{
if (sigPtr != IntPtr.Zero)
{
// This is an ordinary ArgIterator capable of determining
// types from a signature. Just do a regular GetNextArg.
return GetNextArg();
}
else
{
// Prevent abuse of this API with a default ArgIterator (it
// doesn't require permission to create a zero-inited value
// type). Check that ArgPtr isn't zero or this API will allow a
// malicious caller to increment the pointer to an arbitrary
// location in memory and read the contents.
if (ArgPtr == IntPtr.Zero)
throw new ArgumentNullException();
TypedReference result = new TypedReference ();
// reference to TypedReference is banned, so have to pass result as pointer
unsafe
{
InternalGetNextArg(&result, rth.GetRuntimeType());
}
return result;
}
}
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
// reference to TypedReference is banned, so have to pass result as void pointer
private unsafe extern void InternalGetNextArg(void * result, RuntimeType rt);
// This method should invalidate the iterator (va_end). It is not supported yet.
public void End()
{
}
// How many arguments are left in the list
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public extern int GetRemainingCount();
// Gets the type of the current arg, does NOT advance the iterator
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern unsafe void* _GetNextArgType();
[System.Security.SecuritySafeCritical] // auto-generated
public unsafe RuntimeTypeHandle GetNextArgType()
{
return new RuntimeTypeHandle(Type.GetTypeFromHandleUnsafe((IntPtr)_GetNextArgType()));
}
public override int GetHashCode()
{
return ValueType.GetHashCodeOfPtr(ArgCookie);
}
// Inherited from object
public override bool Equals(Object o)
{
throw new NotSupportedException(Environment.GetResourceString("NotSupported_NYI"));
}
private IntPtr ArgCookie; // Cookie from the EE.
// The SigPointer structure consists of the following members. (Note: this is an inline native SigPointer data type)
private IntPtr sigPtr; // Pointer to remaining signature.
private IntPtr sigPtrLen; // Remaining length of the pointer
// Note, sigPtrLen is actually a DWORD, but on 64bit systems this structure becomes
// 8-byte aligned, which requires us to pad it.
private IntPtr ArgPtr; // Pointer to remaining args.
private int RemainingArgs; // # of remaining args.
}
}
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