private static CreateInstanceMethod GenerateCreateInstanceMethod(ConstructorInfo constructor)
{
var objectType = constructor.DeclaringType;
DynamicMethod method = new DynamicMethod(string.Format("CreateInstanceByConstructor_{0}", Guid.NewGuid().ToString("n"))
, typeof(object)
, new Type[] { typeof(object[]) }
, true);
MethodGenerator g = new MethodGenerator(method);
//以下代码把数组参数转成，new T(arg0,arg1)的形式
var result = g.Declare(objectType, "result");
var objs = g.Declare <object[]>();
g.Assign(objs, () =>
{
g.LoadParameter(0);
});
g.Assign(result, () =>
{
g.NewObject(constructor, () =>
{
var index = g.Declare <int>();
var prms = constructor.GetParameters();
for (var i = 0; i < prms.Length; i++)
{
g.Assign(index, () =>
{
g.Load(i);
});
g.LoadElement(objs, index);
g.Cast(prms[i].ParameterType);
}
});
});
g.LoadVariable("result");
g.Cast(typeof(object));
g.Return();
var invoke = method.CreateDelegate(typeof(Func <object[], object>));
return(new CreateInstanceMethod(invoke));
}
private IrisType ProcessArrayAccess(FilePosition fp, Symbol symbol, SymbolLoadMode mode)
{
IrisType symbolType = symbol.Type;
IrisType resultType = IrisType.Invalid;
if (symbolType != IrisType.Invalid)
{
if (!symbolType.IsArray)
{
AddError(fp, string.Format("Symbol '{0}' is not an array, but is being used as an array.", _lexeme));
}
else
{
EmitLoadSymbol(symbol, SymbolLoadMode.Dereference);
resultType = symbol.Type.GetElementType();
}
}
FilePosition indexerPosition = _lexer.TokenStartPosition;
IrisType indexerType = ParseExpression();
if (indexerType != IrisType.Integer)
{
AddError(indexerPosition, "Expecting integer value as array index.");
}
Expect(Token.ChrCloseBracket);
if (resultType != IrisType.Invalid)
{
if (mode == SymbolLoadMode.ElementAddress)
{
MethodGenerator.LoadElementAddress(resultType);
resultType = resultType.MakeByRefType();
}
else if (mode == SymbolLoadMode.Element)
{
MethodGenerator.LoadElement(resultType);
}
}
return(resultType);
}
