LibJS: Improve function hoisting across blocks

The parser now keeps track of a scope chain so that it can hoist
function declarations to the closest function scope.

1 files changed, 3 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/AST.h b/Userland/Libraries/LibJS/AST.h
index e71a91b638..f6bc2639de 100644
--- a/Userland/Libraries/LibJS/AST.h
+++ b/Userland/Libraries/LibJS/AST.h
@@ -145,8 +145,10 @@ public:
 
     void add_variables(NonnullRefPtrVector<VariableDeclaration>);
     void add_functions(NonnullRefPtrVector<FunctionDeclaration>);
+    void add_hoisted_functions(NonnullRefPtrVector<FunctionDeclaration>);
     NonnullRefPtrVector<VariableDeclaration> const& variables() const { return m_variables; }
     NonnullRefPtrVector<FunctionDeclaration> const& functions() const { return m_functions; }
+    NonnullRefPtrVector<FunctionDeclaration> const& hoisted_functions() const { return m_hoisted_functions; }
 
 protected:
     explicit ScopeNode(SourceRange source_range)
@@ -160,6 +162,7 @@ private:
     NonnullRefPtrVector<Statement> m_children;
     NonnullRefPtrVector<VariableDeclaration> m_variables;
     NonnullRefPtrVector<FunctionDeclaration> m_functions;
+    NonnullRefPtrVector<FunctionDeclaration> m_hoisted_functions;
 };
 
 class Program final : public ScopeNode {