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[WIP] [TypeChecker] Score disjunctions and constraint components to prune search space #9220

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[WIP] [TypeChecker] Score disjunctions and constraint components to prune search space #9220

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25421fa
[ConstraintSolver] Score disjunctions and constraint components to pr…
xedin May 3, 2017
42b17ab
[ConstraintSolver] Simplify `solveSimplified` by removing disjunction…
xedin Aug 24, 2017
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33 changes: 0 additions & 33 deletions lib/Sema/CSBindings.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,39 +51,6 @@ ConstraintSystem::determineBestBindings() {
return std::make_pair(bestBindings, bestTypeVar);
}

/// Find the set of type variables that are inferable from the given type.
///
/// \param type The type to search.
/// \param typeVars Collects the type variables that are inferable from the
/// given type. This set is not cleared, so that multiple types can be explored
/// and introduce their results into the same set.
static void
findInferableTypeVars(Type type,
SmallPtrSetImpl<TypeVariableType *> &typeVars) {
type = type->getCanonicalType();
if (!type->hasTypeVariable())
return;

class Walker : public TypeWalker {
SmallPtrSetImpl<TypeVariableType *> &typeVars;

public:
explicit Walker(SmallPtrSetImpl<TypeVariableType *> &typeVars)
: typeVars(typeVars) {}

Action walkToTypePre(Type ty) override {
if (ty->is<DependentMemberType>())
return Action::SkipChildren;

if (auto typeVar = ty->getAs<TypeVariableType>())
typeVars.insert(typeVar);
return Action::Continue;
}
};

type.walk(Walker(typeVars));
}

/// \brief Return whether a relational constraint between a type variable and a
/// trivial wrapper type (autoclosure, unary tuple) should result in the type
/// variable being potentially bound to the value type, as opposed to the
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