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Initial implementation of unformed state for local variables. (#1387)

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Allows unformed state for local variables. Reports a run-time error when an unformed local variable is used.
- Added declaration without initialization for local variables in the parser.
- Made the init expression of VariableDefinition optional.
- Expanded (alive, dead) to (uninitialized, alive, dead) in the Heap.

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Zenong Zhang
2022-07-20 16:03:52 -04:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent 04cfcc1dc2
commit 52ee050019
22 changed files with 327 additions and 43 deletions
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explorer/interpreter/value.cpp
+7
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@@ -381,6 +381,11 @@ void Value::Print(llvm::raw_ostream& out) const {
out << "}";
break;
}
case Value::Kind::UninitializedValue: {
const auto& uninit = cast<UninitializedValue>(*this);
out << "Uninit<" << uninit.pattern() << ">";
break;
}
case Value::Kind::NominalClassType: {
const auto& class_type = cast<NominalClassType>(*this);
out << "class ";
@@ -721,6 +726,7 @@ auto TypeEqual(Nonnull<const Value*> t1, Nonnull<const Value*> t2,
case Value::Kind::BindingPlaceholderValue:
case Value::Kind::AddrValue:
case Value::Kind::ContinuationValue:
case Value::Kind::UninitializedValue:
case Value::Kind::ParameterizedEntityName:
case Value::Kind::MemberName:
case Value::Kind::TypeOfParameterizedEntityName:
@@ -848,6 +854,7 @@ auto ValueStructurallyEqual(
case Value::Kind::ContinuationValue:
case Value::Kind::PointerValue:
case Value::Kind::LValue:
case Value::Kind::UninitializedValue:
case Value::Kind::MemberName:
// TODO: support pointer comparisons once we have a clearer distinction
// between pointers and lvalues.