stan/Ecoop2024_TIforWildFJ
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Add T-Elvis rule

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Andreas Stadelmeier 2024-03-06 16:08:12 +01:00
parent 323f2c0163
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11
constraints.tex
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@ -12,6 +12,17 @@
Constraint generation step is the same as in \cite{TIforFGJ} except for field access and method invocation. Constraint generation step is the same as in \cite{TIforFGJ} except for field access and method invocation.
Here \fjtype{} generates capture constraints instead of normal subtype constraints. Here \fjtype{} generates capture constraints instead of normal subtype constraints.
Subtype constraints are created according to the type rules defined in section \ref{sec:tifj}.
The \typeExpr{} function creates constraints for a given expression.
$\begin{array}{c}
\typeExpr(\texttt{t}_1, \ntv{b}) = C_l \quad \quad \typeExpr(\texttt{t}_2, \ntv{c}) = C_l \quad \quad \ntv{b}, \ntv{c} \ \text{fresh}
\\
\hline
\typeExpr(\texttt{t}_1 \texttt{?:} \texttt{t}_2, \tv{a}) = C_l \cup C_r \cup \set{\ntv{b} \lessdot \tv{a}, \ntv{c} \lessdot \tv{a}}
\end{array}
$
The constraint generation step cannot determine if a capture conversion is needed for a field access or a method call. The constraint generation step cannot determine if a capture conversion is needed for a field access or a method call.
Those statements produce $\lessdotCC$ constraints which signal the \unify{} algorithm that they qualify for a capture conversion. Those statements produce $\lessdotCC$ constraints which signal the \unify{} algorithm that they qualify for a capture conversion.

2
tRules.tex
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@ -18,6 +18,8 @@ class List<A> {
} }
\end{verbatim} \end{verbatim}
%The rules depicted here are type inference rules. It is not possible to derive a distinct typing from a given input program.
%The T-Elvis rule mimics the type judgement of a branch expression like \texttt{if-else}. %The T-Elvis rule mimics the type judgement of a branch expression like \texttt{if-else}.
%and is solely used for examples. %and is solely used for examples.
The calculus does not include method overriding for simplicity reasons. The calculus does not include method overriding for simplicity reasons.