/* 读取属性
* // IL代码: 实际访问 get_PropertyName() 方法;
*
* 1. 载入第一参数 (隐藏实例变量)
* ldarg.0
* 2. 转换实例类型: (如果需要)
*
*
* 3. 读取属性:
* 1). 实例: callvirt instance {MethodReturnTypeName} {TargetTypeName::get_PropertyName()}
* 2). 静态: call {MethodReturnTypeName} {TargetTypeName::get_PropertyName()}
*
* 4. 转换结果类型: (如果需要)
*
* 5. 退出方法
* ret
*/
Delegate InternalPropertyGetWithDynamic(PropertyInfo member, Type instance, Type value)
{
var method = member.GetGetMethod(true);
var property = member.PropertyType;
if (value == null)
{
value = property;
}
if (!method.IsStatic)
{
var reflected = method.ReflectedType;
if (instance == null)
{
instance = reflected;
}
var @dynamic = CreateDynamicMethod(value, new[] { instance }, _DynamicOptionsProperty, member);
var il = @dynamic.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
ConvertIfNeeded(il, reflected, instance); //
if (reflected.IsValueType)
{
il.EmitCall(OpCodes.Call, method, null);
}
else
{
il.EmitCall(OpCodes.Callvirt, method, null);
}
ConvertIfNeeded(il, value, property); //
il.Emit(OpCodes.Ret);
return(@dynamic.CreateDelegate(TypeMemberGetInstance.MakeGenericType(new[] { instance, value })));
}
else
{
if (instance != null)
{
throw Error.StaticObjectCannotConvertType("instance");
}
var @dynamic = CreateDynamicMethod(value, null, _DynamicOptionsProperty, member);
var il = @dynamic.GetILGenerator();
il.EmitCall(OpCodes.Call, method, null);
ConvertIfNeeded(il, value, property); //
il.Emit(OpCodes.Ret);
return(@dynamic.CreateDelegate(TypeMemberGetStatic.MakeGenericType(new[] { value })));
}
}
/* 读取字段
* IL:
* TField Function(TInstance instance) {
* 1. 载入第一参数:
* ldarg.0
* 2. 转换实例类型: (如果需要)
*
*
* 3. 读取字段:
* {OpCode} {FieldTypeName} {TargetTypeName::FieldName}
* {OpCode}:
* 1). 实例: ldfld;
* 2). 静态: ldsfld;
* {FieldTypeName}:
* 1). 标量类型: {TypeName};
* 2). 引用类型: class {TypeName}
* 3). 数值类型: valuetype {TypeName}
* 4. 转换结果类型: (如果需要)
*
*
* 5. 退出方法
* ret
* }
*/
Delegate InternalFieldGetWithDynamic(FieldInfo member, Type instance, Type value)
{
var field = member.FieldType;
if (value == null)
{
value = field;
}
if (!member.IsStatic)
{
var reflected = member.ReflectedType;
if (instance == null)
{
instance = reflected;
}
var @dynamic = CreateDynamicMethod(value, new[] { instance }, _DynamicOptionsField, member);
var il = @dynamic.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
ConvertIfNeeded(il, reflected, instance); //
il.Emit(OpCodes.Ldfld, member);
ConvertIfNeeded(il, value, field); //
il.Emit(OpCodes.Ret);
return(@dynamic.CreateDelegate(TypeMemberGetInstance.MakeGenericType(new[] { instance, value })));
}
else
{
if (instance != null)
{
throw new ArgumentException();
}
var @dynamic = CreateDynamicMethod(value, null, _DynamicOptionsField, member);
var il = @dynamic.GetILGenerator();
il.Emit(OpCodes.Ldsfld, member);
ConvertIfNeeded(il, value, field); //
il.Emit(OpCodes.Ret);
return(@dynamic.CreateDelegate(TypeMemberGetStatic.MakeGenericType(new[] { value })));
}
}
