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Add support for return; (#678)

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This creates a ReturnExpression. A separate change should enforce that an implicit return of `()` is only allowed in functions that have an implicit return type of `()`, and I think the structure taken here should ease that.
This commit is contained in:
Jon Meow
2021-08-02 16:30:08 -07:00
committed by GitHub
parent b1993a6cd0
commit 6ae9cc3cf8
16 changed files with 114 additions and 33 deletions
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executable_semantics/ast/expression.h
+4 -2
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@@ -124,6 +124,7 @@ struct FunctionTypeLiteral {
static constexpr ExpressionKind Kind = ExpressionKind::FunctionTypeLiteral;
const Expression* parameter;
const Expression* return_type;
bool is_omitted_return_type;
};
struct BoolTypeLiteral {
@@ -162,8 +163,9 @@ struct Expression {
static auto MakeTypeTypeLiteral(int line_num) -> const Expression*;
static auto MakeIntTypeLiteral(int line_num) -> const Expression*;
static auto MakeBoolTypeLiteral(int line_num) -> const Expression*;
static auto MakeFunctionTypeLiteral(int line_num, const Expression* param,
const Expression* ret)
static auto MakeFunctionTypeLiteral(int line_num, const Expression* parameter,
const Expression* return_type,
bool is_omitted_return_type)
-> const Expression*;
static auto MakeContinuationTypeLiteral(int line_num) -> const Expression*;