public void TestMax()
{
var method = new DynamicMethod(Guid.NewGuid().ToString(), typeof(int), new[] { typeof(int), typeof(int) }, typeof(Test));
using (var il = new GroboIL(method))
{
il.Ldarg(0);
il.Ldarg(1);
var returnSecondLabel = il.DefineLabel("returnSecond");
il.Ble(returnSecondLabel, false);
il.Ldarg(0);
il.Ret();
il.MarkLabel(returnSecondLabel);
il.Ldarg(1);
il.Ret();
Console.Write(il.GetILCode());
}
}
public static bool Emit(Expression zarr, Expression zindex, EmittingContext context, GroboIL.Label returnDefaultValueLabel, ResultType whatReturn, bool extend, out Type resultType)
{
var arrayType = zarr.Type;
var isArray = arrayType.IsArray;
if (!isArray && !arrayType.IsList())
{
throw new InvalidOperationException("Unable to perform array index operator to type '" + arrayType + "'");
}
var itemType = isArray ? arrayType.GetElementType() : arrayType.GetGenericArguments()[0];
GroboIL il = context.Il;
EmittingContext.LocalHolder arrayIndex = null;
bool extendArray = extend && (CanAssign(zarr) || !isArray);
bool extendArrayElement = extend && itemType.IsClass;
var result = false;
if (!extendArray)
{
result |= ExpressionEmittersCollection.Emit(zarr, context, returnDefaultValueLabel, ResultType.Value, extend, out arrayType); // stack: [array]
if (context.Options.HasFlag(CompilerOptions.CheckNullReferences))
{
result = true;
il.Dup(); // stack: [array, array]
il.Brfalse(returnDefaultValueLabel); // if(array == null) goto returnDefaultValue; stack: [array]
}
EmitLoadIndex(zindex, context, arrayType); // stack: [array, arrayIndex]
if (context.Options.HasFlag(CompilerOptions.CheckArrayIndexes))
{
result = true;
arrayIndex = context.DeclareLocal(typeof(int));
il.Stloc(arrayIndex); // arrayIndex = index; stack: [array]
il.Dup(); // stack: [array, array]
if (isArray)
{
il.Ldlen(); // stack: [array, array.Length]
}
else
{
EmitLoadField(context, arrayType, arrayType.GetField("_size", BindingFlags.Instance | BindingFlags.NonPublic));
}
il.Ldloc(arrayIndex); // stack: [array, array.Length, arrayIndex]
il.Ble(returnDefaultValueLabel, false); // if(array.Length <= arrayIndex) goto returnDefaultValue; stack: [array]
il.Ldloc(arrayIndex); // stack: [array, arrayIndex]
il.Ldc_I4(0); // stack: [array, arrayIndex, 0]
il.Blt(returnDefaultValueLabel, false); // if(arrayIndex < 0) goto returnDefaultValue; stack: [array]
}
else if (extendArrayElement || !isArray)
{
arrayIndex = context.DeclareLocal(typeof(int));
il.Stloc(arrayIndex); // arrayIndex = index; stack: [array]
}
}
else
{
EmittingContext.LocalHolder arrayOwner = null;
switch (zarr.NodeType)
{
case ExpressionType.Parameter:
case ExpressionType.ArrayIndex:
case ExpressionType.Index:
Type type;
ExpressionEmittersCollection.Emit(zarr, context, returnDefaultValueLabel, ResultType.ByRefAll, true, out type); // stack: [ref array]
arrayOwner = context.DeclareLocal(type);
il.Dup(); // stack: [ref array, ref array]
il.Stloc(arrayOwner); // arrayOwner = ref array; stack: [ref array]
il.Ldind(zarr.Type); // stack: [array]
break;
case ExpressionType.MemberAccess:
var memberExpression = (MemberExpression)zarr;
Type memberType;
context.EmitMemberAccess(memberExpression, returnDefaultValueLabel, context.Options.HasFlag(CompilerOptions.CheckNullReferences), true, ResultType.ByRefValueTypesOnly, out memberType, out arrayOwner); // stack: [array]
break;
default:
throw new InvalidOperationException("Cannot extend array for expression with node type '" + zarr.NodeType + "'");
}
if (context.Options.HasFlag(CompilerOptions.CheckNullReferences))
{
il.Dup(); // stack: [array, array]
il.Brfalse(returnDefaultValueLabel); // if(array == null) goto returnDefaultValue; stack: [array]
}
EmitLoadIndex(zindex, context, arrayType);
result = true;
arrayIndex = context.DeclareLocal(typeof(int));
il.Stloc(arrayIndex); // arrayIndex = index; stack: [array]
il.Ldloc(arrayIndex); // stack: [array, arrayIndex]
il.Ldc_I4(0); // stack: [array, arrayIndex, 0]
il.Blt(returnDefaultValueLabel, false); // if(arrayIndex < 0) goto returnDefaultValue; stack: [array]
il.Dup(); // stack: [array, array]
if (isArray)
{
il.Ldlen(); // stack: [array, array.Length]
}
else
{
EmitLoadField(context, arrayType, arrayType.GetField("_size", BindingFlags.Instance | BindingFlags.NonPublic));
}
il.Ldloc(arrayIndex); // stack: [array, array.Length, arrayIndex]
var bigEnoughLabel = il.DefineLabel("bigEnough");
il.Bgt(bigEnoughLabel, false); // if(array.Length > arrayIndex) goto bigEnough; stack: [array]
using (var array = context.DeclareLocal(arrayType))
{
il.Stloc(array); // stack: []
if (!isArray)
{
EnsureCount(context, array, arrayIndex, arrayType);
}
else
{
il.Ldloca(array); // stack: [ref array]
il.Ldloc(arrayIndex); // stack: [ref array, arrayIndex]
il.Ldc_I4(1); // stack: [ref array, arrayIndex, 1]
il.Add(); // stack: [ref array, arrayIndex + 1]
il.Call(arrayResizeMethod.MakeGenericMethod(arrayType.GetElementType())); // Array.Resize(ref array, 1 + arrayIndex); stack: []
switch (zarr.NodeType)
{
case ExpressionType.Parameter:
case ExpressionType.ArrayIndex:
case ExpressionType.Index:
il.Ldloc(arrayOwner); // stack: [ref parameter]
il.Ldloc(array); // stack: [ref parameter, array]
il.Stind(arrayType); // parameter = array; stack: []
break;
case ExpressionType.MemberAccess:
var memberExpression = (MemberExpression)zarr;
if (memberExpression.Expression != null)
{
il.Ldloc(arrayOwner);
}
il.Ldloc(array);
switch (memberExpression.Member.MemberType)
{
case MemberTypes.Field:
il.Stfld((FieldInfo)memberExpression.Member);
break;
case MemberTypes.Property:
var propertyInfo = (PropertyInfo)memberExpression.Member;
var setter = propertyInfo.GetSetMethod(context.SkipVisibility);
if (setter == null)
{
throw new MissingMethodException(propertyInfo.ReflectedType.ToString(), "set_" + propertyInfo.Name);
}
il.Call(setter, memberExpression.Expression == null ? null : memberExpression.Expression.Type);
break;
default:
throw new NotSupportedException("Member type '" + memberExpression.Member.MemberType + "' is not supported");
}
break;
default:
throw new InvalidOperationException("Unable to assign array to an expression with node type '" + zarr.NodeType);
}
}
il.Ldloc(array);
context.MarkLabelAndSurroundWithSP(bigEnoughLabel);
}
}
if (!isArray)
{
// TODO: это злобно, лист при всех операциях меняет _version, а мы нет
EmitLoadField(context, arrayType, arrayType.GetField("_items", BindingFlags.Instance | BindingFlags.NonPublic));
arrayType = itemType.MakeArrayType();
}
if (extendArrayElement)
{
// stack: [array]
var constructor = itemType.GetConstructor(Type.EmptyTypes);
if (itemType.IsArray || constructor != null)
{
using (var array = context.DeclareLocal(arrayType))
{
il.Dup(); // stack: [array, array]
il.Stloc(array); // stack: [array]
il.Ldloc(arrayIndex); // stack: [array, arrayIndex]
il.Ldelem(itemType); // stack: [array[arrayIndex]]
var elementIsNotNullLabel = il.DefineLabel("elementIsNotNull");
il.Brtrue(elementIsNotNullLabel);
il.Ldloc(array);
il.Ldloc(arrayIndex);
context.Create(itemType);
il.Stelem(itemType);
context.MarkLabelAndSurroundWithSP(elementIsNotNullLabel);
il.Ldloc(array);
}
}
}
if (arrayIndex != null)
{
il.Ldloc(arrayIndex);
arrayIndex.Dispose();
}
switch (whatReturn)
{
case ResultType.ByRefAll:
il.Ldelema(itemType);
resultType = itemType.MakeByRefType();
break;
case ResultType.ByRefValueTypesOnly:
if (itemType.IsValueType)
{
il.Ldelema(itemType);
resultType = itemType.MakeByRefType();
}
else
{
il.Ldelem(itemType); // stack: [array[arrayIndex]]
resultType = itemType;
}
break;
default:
il.Ldelem(itemType); // stack: [array[arrayIndex]]
resultType = itemType;
break;
}
return(result);
}
