/// <summary>
/// Gets the expression for the actual updating of the line number for stack traces to be available
/// </summary>
internal MSAst.Expression GetSaveLineNumberExpression(MSAst.ParameterExpression exception, bool preventAdditionalAdds)
{
Debug.Assert(exception.Type == typeof(Exception));
return(Ast.Block(
AstUtils.If(
Ast.Not(
LineNumberUpdated
),
Ast.Call(
AstMethods.UpdateStackTrace,
exception,
LocalContext,
_funcCodeExpr,
_GetCurrentMethod,
AstUtils.Constant(Name),
AstUtils.Constant(GlobalParent.SourceUnit.Path ?? "<string>"),
new LastFaultingLineExpression(LineNumberExpression)
)
),
Ast.Assign(
LineNumberUpdated,
AstUtils.Constant(preventAdditionalAdds)
),
AstUtils.Empty()
));
}
/// <summary>
/// Gets the expression for the actual updating of the line number for stack traces to be available
/// </summary>
internal MSAst.Expression GetSaveLineNumberExpression(bool preventAdditionalAdds)
{
MSAst.Expression res;
if (preventAdditionalAdds)
{
res = _saveLineNumberNoAdds;
}
else
{
res = _saveLineNumberAdds;
}
if (res == null)
{
res = Ast.Block(
AstUtils.If(
Ast.Not(
LineNumberUpdated
),
Ast.Call(
AstMethods.UpdateStackTrace,
LocalContext,
_funcCodeExpr,
_GetCurrentMethod,
AstUtils.Constant(Name),
AstUtils.Constant(GlobalParent.SourceUnit.Path ?? "<string>"),
new LastFaultingLineExpression(LineNumberExpression)
)
),
Ast.Assign(
LineNumberUpdated,
AstUtils.Constant(preventAdditionalAdds)
),
AstUtils.Empty()
);
if (preventAdditionalAdds)
{
_saveLineNumberNoAdds = res;
}
else
{
_saveLineNumberAdds = res;
}
}
return(res);
}
/// <summary>
/// Gets the expression for the actual updating of the line number for stack traces to be available
/// </summary>
internal MSAst.Expression GetSaveLineNumberExpression(MSAst.ParameterExpression exception, bool preventAdditionalAdds) {
Debug.Assert(exception.Type == typeof(Exception));
return Ast.Block(
AstUtils.If(
Ast.Not(
LineNumberUpdated
),
UpdateStackTrace(exception)
),
Ast.Assign(
LineNumberUpdated,
AstUtils.Constant(preventAdditionalAdds)
),
AstUtils.Empty()
);
}
/// <summary>
/// Helper to produce the rule for converting T to Nullable of T
/// </summary>
private void MakeConvertingToTToNullableOfTTarget(Type toType)
{
Type valueType = toType.GetGenericArguments()[0];
// ConvertSelfToT -> Nullable<T>
if (Action.ResultKind == ConversionResultKind.ExplicitCast)
{
var action = OldConvertToAction.Make(Binder, valueType, Action.ResultKind);
var conversion = Expression.Dynamic(action, action.ToType, _rule.Context, _rule.Parameters[0]);
// if the conversion to T fails we just throw
_rule.Target =
_rule.MakeReturn(
Binder,
Ast.New(
toType.GetConstructor(new Type[] { valueType }),
conversion
)
);
}
else
{
// if the conversion to T succeeds then produce the nullable<T>, otherwise return default(retType)
var conversion = Expression.Dynamic(OldConvertToAction.Make(Binder, valueType, Action.ResultKind), typeof(object), _rule.Context, _rule.Parameters[0]);
ParameterExpression tmp = _rule.GetTemporary(typeof(object), "tmp");
_rule.Target =
AstUtils.If(
Ast.NotEqual(
Ast.Assign(tmp, conversion),
Ast.Constant(null)
),
_rule.MakeReturn(
Binder,
Ast.New(
toType.GetConstructor(new Type[] { valueType }),
Ast.Convert(
tmp,
valueType
)
)
)
).Else(
CompilerHelpers.GetTryConvertReturnValue(Context, _rule)
);
}
}
/// <summary> if a member-injector is defined-on or registered-for this type call it </summary>
protected void MakeOperatorGetMemberBody(Type type, string name)
{
MethodInfo getMem = GetMethod(type, name);
if (getMem != null && getMem.IsSpecialName)
{
ParameterExpression tmp = Rule.GetTemporary(typeof(object), "getVal");
AddToBody(
AstUtils.If(
Ast.NotEqual(
Ast.Assign(
tmp,
Binder.MakeCallExpression(Rule.Context, getMem, Instance, Ast.Constant(StringName))
),
Ast.Field(null, typeof(OperationFailed).GetField("Value"))
),
Rule.MakeReturn(Binder, tmp)
)
);
}
}
/// <summary> if a member-injector is defined-on or registered-for this type call it </summary>
private bool MakeOperatorGetMemberBody(Type type, string name)
{
MethodInfo delMem = GetMethod(type, name);
if (delMem != null && delMem.IsSpecialName)
{
Expression call = Binder.MakeCallExpression(Rule.Context, delMem, Rule.Parameters[0], Ast.Constant(StringName));
Expression ret;
if (delMem.ReturnType == typeof(bool))
{
ret = AstUtils.If(call, Rule.MakeReturn(Binder, Ast.Constant(null)));
}
else
{
ret = Rule.MakeReturn(Binder, call);
}
AddToBody(ret);
return(delMem.ReturnType != typeof(bool));
}
return(false);
}
// see Ruby Language.doc/Runtime/Control Flow Implementation/While-Until
internal override MSA.Expression /*!*/ TransformRead(AstGenerator /*!*/ gen)
{
MSA.Expression resultVariable = gen.CurrentScope.DefineHiddenVariable("#loop-result", typeof(object));
MSA.Expression redoVariable = gen.CurrentScope.DefineHiddenVariable("#skip-condition", typeof(bool));
MSA.ParameterExpression unwinder;
bool isInnerLoop = gen.CurrentLoop != null;
MSA.LabelTarget breakLabel = Ast.Label();
MSA.LabelTarget continueLabel = Ast.Label();
gen.EnterLoop(redoVariable, resultVariable, breakLabel, continueLabel);
MSA.Expression transformedBody = gen.TransformStatements(_statements, ResultOperation.Ignore);
MSA.Expression transformedCondition = _condition.TransformCondition(gen, true);
gen.LeaveLoop();
MSA.Expression conditionPositiveStmt, conditionNegativeStmt;
if (_isWhileLoop)
{
conditionPositiveStmt = AstUtils.Empty();
conditionNegativeStmt = Ast.Break(breakLabel);
}
else
{
conditionPositiveStmt = Ast.Break(breakLabel);
conditionNegativeStmt = AstUtils.Empty();
}
// make the loop first:
MSA.Expression loop = new AstBlock {
gen.ClearDebugInfo(),
Ast.Assign(redoVariable, AstUtils.Constant(_isPostTest)),
AstFactory.Infinite(breakLabel, continueLabel,
AstUtils.Try(
AstUtils.If(redoVariable,
Ast.Assign(redoVariable, AstUtils.Constant(false))
).ElseIf(transformedCondition,
conditionPositiveStmt
).Else(
conditionNegativeStmt
),
transformedBody,
AstUtils.Empty()
).Catch(unwinder = Ast.Parameter(typeof(BlockUnwinder), "#u"),
// redo = u.IsRedo
Ast.Assign(redoVariable, Ast.Field(unwinder, BlockUnwinder.IsRedoField)),
AstUtils.Empty()
).Filter(unwinder = Ast.Parameter(typeof(EvalUnwinder), "#u"),
Ast.Equal(Ast.Field(unwinder, EvalUnwinder.ReasonField), AstFactory.BlockReturnReasonBreak),
// result = unwinder.ReturnValue
Ast.Assign(resultVariable, Ast.Field(unwinder, EvalUnwinder.ReturnValueField)),
Ast.Break(breakLabel)
)
),
gen.ClearDebugInfo(),
AstUtils.Empty(),
};
// wrap it to try finally that updates RFC state:
if (!isInnerLoop)
{
loop = AstUtils.Try(
Methods.EnterLoop.OpCall(gen.CurrentScopeVariable),
loop
).Finally(
Methods.LeaveLoop.OpCall(gen.CurrentScopeVariable)
);
}
return(Ast.Block(loop, resultVariable));
}
