furc/include/furc/ast/declaration.hpp

@@ -19,7 +19,15 @@ enum class declaration_node_t {
 /**
  * @brief Declaration AST node interface.
  */
-class declaration_node : public statement_node {
+class declaration_node : public statement_node, public abstract_node {
+public:
+    /**
+     * @brief Construct a new declaration AST node.
+     *
+     * @param location Node location.
+     */
+    declaration_node(struct location location)
+      : abstract_node(location) {}
 public:
     /**
      * @brief Returns this node's category.
@@ -53,10 +61,11 @@ public:
     /**
      * @brief Construct a new function declaration node object from name token.
      *
+     * @param location Node location.
      * @param name Name of the function.
      */
-    function_declaration_node(front::token name)
-      : p_name(name) {}
+    function_declaration_node(struct location location, front::token name)
+      : declaration_node(location), p_name(name) {}
 public:
     /**
      * @brief Returns this node's declaration type.
@@ -92,11 +101,12 @@ public:
     /**
      * @brief Construct a new function definition node object from name and body.
      *
+     * @param location Node location.
      * @param name Name of the function.
      * @param body Body of the function.
      */
-    function_definition_node(front::token name, body_r&& body)
-      : function_declaration_node(name), m_body(std::move(body)) {}
+    function_definition_node(struct location location, front::token name, body_r&& body)
+      : function_declaration_node(location, name), m_body(std::move(body)) {}
 public:
     /**
      * @brief Returns this node's declaration type.

furc/include/furc/ast/expression.hpp

@@ -21,7 +21,15 @@ enum class expression_node_t {
 /**
  * @brief Expression AST node.
  */
-class expression_node : public statement_node {
+class expression_node : public statement_node, public abstract_node {
+public:
+    /**
+     * @brief Construct a new expression AST node.
+     *
+     * @param location Node location.
+     */
+    expression_node(struct location location)
+      : abstract_node(location) {}
 public:
     /**
      * @brief Returns this node's category.
@@ -57,10 +65,11 @@ public:
     /**
      * @brief Construct a new var read expression node object from a name handle.
      *
+     * @param location Node location.
      * @param name Handle to the name.
      */
-    var_read_expression_node(name_type&& name)
-      : m_name(std::move(name)) {}
+    var_read_expression_node(struct location location, name_type&& name)
+      : expression_node(location), m_name(std::move(name)) {}
 
     /**
      * @brief Returns the variable's name.
@@ -114,11 +123,12 @@ public:
     /**
      * @brief Construct a new unaryop expression node object from type and expression node handle.
      *
+     * @param location Node location.
      * @param type Operation type.
      * @param node Handle to the inner expression node.
      */
-    unaryop_expression_node(unaryop_expression_node_t type, expression_node_r&& node)
-      : m_type(type), m_node(std::move(node)) {}
+    unaryop_expression_node(struct location location, unaryop_expression_node_t type, expression_node_r&& node)
+      : expression_node(location), m_type(type), m_node(std::move(node)) {}
 
     /**
      * @brief Sets this node's inner expression.
@@ -199,12 +209,16 @@ public:
     /**
      * @brief Construct a new binary operation expression AST node.
      *
+     * @param location Node location.
      * @param type Binary operation type.
      * @param lhs Left-hand-side expression.
      * @param rhs Right-hand-side expression.
      */
-    binop_expression_node(binop_expression_node_t type, expression_node_r&& lhs, expression_node_r&& rhs)
-      : m_type(type), m_lhs(std::move(lhs)), m_rhs(std::move(rhs)) {}
+    binop_expression_node(struct location location,
+        binop_expression_node_t           type,
+        expression_node_r&&               lhs,
+        expression_node_r&&               rhs)
+      : expression_node(location), m_type(type), m_lhs(std::move(lhs)), m_rhs(std::move(rhs)) {}
 
     /**
      * @brief Returns this node's binary operation type.
@@ -276,21 +290,29 @@ public:
     /**
      * @brief Construct a new variable assignment expression AST node.
      *
+     * @param location Node location.
      * @param lhs Left-hand-side expression handle.
      * @param rhs Right-hand-side expression handle.
      */
-    var_assign_expression_node(expression_node_r&& lhs, expression_node_r&& rhs)
-      : m_compound(binop_expression_node_t::None), m_lhs(std::move(lhs)), m_rhs(std::move(rhs)) {}
+    var_assign_expression_node(struct location location, expression_node_r&& lhs, expression_node_r&& rhs)
+      : expression_node(location),
+        m_compound(binop_expression_node_t::None),
+        m_lhs(std::move(lhs)),
+        m_rhs(std::move(rhs)) {}
 
     /**
      * @brief Construct a new compound variable assignment expression AST node.
      *
+     * @param location Node location.
      * @param compound Compound operation type.
      * @param lhs Left-hand-side expression handle.
      * @param rhs Right-hand-side expression handle.
      */
-    var_assign_expression_node(binop_expression_node_t compound, expression_node_r&& lhs, expression_node_r&& rhs)
-      : m_compound(compound), m_lhs(std::move(lhs)), m_rhs(std::move(rhs)) {}
+    var_assign_expression_node(struct location location,
+        binop_expression_node_t                compound,
+        expression_node_r&&                    lhs,
+        expression_node_r&&                    rhs)
+      : expression_node(location), m_compound(compound), m_lhs(std::move(lhs)), m_rhs(std::move(rhs)) {}
 
     /**
      * @brief Returns this node's compound operation type.

furc/include/furc/ast/literal.hpp

@@ -20,6 +20,14 @@ enum class literal_node_t {
  * @brief Literal AST node.
  */
 class literal_node : public expression_node {
+public:
+    /**
+     * @brief Construct a new literal AST node.
+     *
+     * @param location Node location.
+     */
+    literal_node(struct location location)
+      : expression_node(location) {}
 public:
     /**
      * @brief Returns this node's category.
@@ -55,10 +63,11 @@ public:
     /**
      * @brief Construct a new string literal node object from a handle.
      *
+     * @param location Node location.
      * @param value A string view result.
      */
-    string_literal_node(value_type&& value)
-      : m_value(std::move(value)) {}
+    string_literal_node(struct location location, value_type&& value)
+      : literal_node(location), m_value(std::move(value)) {}
 public:
     /**
      * @brief Returns this node's literal type.
@@ -93,10 +102,11 @@ public:
     /**
      * @brief Construct a new integer literal node object from a handle.
      *
+     * @param location Node location.
      * @param value An integer result.
      */
-    integer_literal_node(value_type&& value)
-      : m_value(std::move(value)) {}
+    integer_literal_node(struct location location, value_type&& value)
+      : literal_node(location), m_value(std::move(value)) {}
 public:
     /**
      * @brief Returns this node's literal type.

furc/include/furc/ast/node.hpp

@@ -71,6 +71,14 @@ public:
      * @return The node category.
      */
     virtual node_t category() const = 0;
+
+    /**
+     * @brief Returns the location of this AST node.
+     * @see locaiton
+     *
+     * @return The location.
+     */
+    virtual location location() const = 0;
 public:
     /**
      * @brief Compares two nodes for equality.
@@ -128,6 +136,28 @@ protected:
     virtual bool equal(const node& rhs) const = 0;
 };
 
+/**
+ * @brief An abstract AST node.
+ * @see node
+ *
+ * Implements location().
+ */
+class abstract_node : public virtual node {
+public:
+    abstract_node(struct location location)
+      : p_location(location) {}
+public:
+    /**
+     * @brief Returns the location of this AST node.
+     * @see locaiton
+     *
+     * @return The location.
+     */
+    struct location location() const override { return p_location; }
+protected:
+    struct location p_location; /**< Node location. */
+};
+
 } // namespace ast
 } // namespace furc
 

furc/include/furc/ast/program.hpp

@@ -12,9 +12,15 @@ namespace ast {
 /**
  * @brief Program AST node.
  */
-class program_node final : public node {
+class program_node final : public abstract_node {
 public:
-    program_node() = default;
+    /**
+     * @brief Construct a new program AST node.
+     *
+     * @param location Node location.
+     */
+    program_node(struct location location)
+      : abstract_node(location) {}
 
     node_t category() const override { return node_t::Program; }
 public:

furc/include/furc/ast/statement.hpp

@@ -22,7 +22,7 @@ enum class statement_node_t {
 /**
  * @brief Statement AST node.
  */
-class statement_node : public node {
+class statement_node : public virtual node {
 public:
     /**
      * @brief Returns this node's category.
@@ -44,19 +44,24 @@ protected:
 /**
  * @brief Return statement AST node.
  */
-class return_statement_node final : public statement_node {
+class return_statement_node final : public statement_node, public abstract_node {
 public:
     using value_type = std::optional<expression_node_r>; /**< Value type. */
 public:
-    return_statement_node() = default;
+    /**
+     * @brief Construct a new return statement AST node.
+     */
+    return_statement_node(struct location location)
+      : abstract_node(location) {}
 
     /**
      * @brief Construct a new return statement AST node.
      *
+     * @param location Node location.
      * @param value Return value handle.
      */
-    return_statement_node(expression_node_r&& value)
-      : m_value(std::move(value)) {}
+    return_statement_node(struct location location, expression_node_r&& value)
+      : abstract_node(location), m_value(std::move(value)) {}
 public:
     /**
      * @brief Returns this node's return value handle.
@@ -84,26 +89,31 @@ private:
 /**
  * @brief If statement AST node.
  */
-class if_statement_node final : public statement_node {
+class if_statement_node final : public statement_node, public abstract_node {
 public:
     /**
      * @brief Construct a new if statement AST node.
      *
+     * @param location Node location.
      * @param cond Condition expression handle.
      * @param then Then statement handle.
      */
-    if_statement_node(expression_node_r&& cond, statement_node_r&& then)
-      : m_cond(std::move(cond)), m_then(std::move(then)) {}
+    if_statement_node(struct location location, expression_node_r&& cond, statement_node_r&& then)
+      : abstract_node(location), m_cond(std::move(cond)), m_then(std::move(then)) {}
 
     /**
      * @brief Construct a new if statement AST node.
      *
+     * @param location Node location.
      * @param cond Condition expression handle.
      * @param then Then statement handle.
      * @param elze Else statement handle.
      */
-    if_statement_node(expression_node_r&& cond, statement_node_r&& then, statement_node_r&& elze)
-      : m_cond(std::move(cond)), m_then(std::move(then)), m_else(std::move(elze)) {}
+    if_statement_node(struct location location,
+        expression_node_r&&           cond,
+        statement_node_r&&            then,
+        statement_node_r&&            elze)
+      : abstract_node(location), m_cond(std::move(cond)), m_then(std::move(then)), m_else(std::move(elze)) {}
 public:
     /**
      * @brief Returns this node's condition expression handle.
@@ -147,15 +157,16 @@ private:
 /**
  * @brief Compound statement AST node.
  */
-class compound_statement_node final : public statement_node {
+class compound_statement_node final : public statement_node, public abstract_node {
 public:
     /**
      * @brief Construct a new compound statement AST node.
      *
+     * @param location Node location.
      * @param body Body handle.
      */
-    compound_statement_node(body_r&& body)
-      : m_body(std::move(body)) {}
+    compound_statement_node(struct location location, body_r&& body)
+      : abstract_node(location), m_body(std::move(body)) {}
 public:
     /**
      * @brief Returns this node's body handle.

furc/src/ast.cpp

@@ -13,7 +13,7 @@ std::ostream& operator<<(std::ostream& os, const error& error) {
 }
 
 bool literal_node::equal(const node& rhs) const {
-    return literal_type() == reinterpret_cast<const literal_node&>(rhs).literal_type();
+    return literal_type() == dynamic_cast<const literal_node&>(rhs).literal_type();
 }
 
 void string_literal_node::accept(visitor& visitor) const {
@@ -26,7 +26,7 @@ std::ostream& string_literal_node::print(std::ostream& os) const {
 }
 
 bool string_literal_node::equal(const node& rhs) const {
-    return literal_node::equal(rhs) && m_value == reinterpret_cast<const string_literal_node&>(rhs).m_value;
+    return literal_node::equal(rhs) && m_value == dynamic_cast<const string_literal_node&>(rhs).m_value;
 }
 
 void integer_literal_node::accept(visitor& visitor) const {
@@ -39,11 +39,11 @@ std::ostream& integer_literal_node::print(std::ostream& os) const {
 }
 
 bool integer_literal_node::equal(const node& rhs) const {
-    return literal_node::equal(rhs) && m_value == reinterpret_cast<const integer_literal_node&>(rhs).m_value;
+    return literal_node::equal(rhs) && m_value == dynamic_cast<const integer_literal_node&>(rhs).m_value;
 }
 
 bool expression_node::equal(const node& rhs) const {
-    return expression_type() == reinterpret_cast<const expression_node&>(rhs).expression_type();
+    return expression_type() == dynamic_cast<const expression_node&>(rhs).expression_type();
 }
 
 void var_read_expression_node::accept(visitor& visitor) const {
@@ -56,7 +56,7 @@ std::ostream& var_read_expression_node::print(std::ostream& os) const {
 }
 
 bool var_read_expression_node::equal(const node& rhsNode) const {
-    const auto& rhs = reinterpret_cast<const var_read_expression_node&>(rhsNode);
+    const auto& rhs = dynamic_cast<const var_read_expression_node&>(rhsNode);
     return expression_node::equal(rhsNode) && m_name == rhs.m_name;
 }
 
@@ -90,7 +90,7 @@ std::ostream& unaryop_expression_node::print(std::ostream& os) const {
 }
 
 bool unaryop_expression_node::equal(const node& rhsNode) const {
-    const auto& rhs = reinterpret_cast<const unaryop_expression_node&>(rhsNode);
+    const auto& rhs = dynamic_cast<const unaryop_expression_node&>(rhsNode);
     return expression_node::equal(rhsNode) && m_type == rhs.m_type && m_node == rhs.m_node;
 }
 
@@ -122,7 +122,7 @@ std::ostream& binop_expression_node::print(std::ostream& os) const {
 }
 
 bool binop_expression_node::equal(const node& rhsNode) const {
-    const auto& rhs = reinterpret_cast<const binop_expression_node&>(rhsNode);
+    const auto& rhs = dynamic_cast<const binop_expression_node&>(rhsNode);
     return expression_node::equal(rhsNode) && m_type == rhs.m_type && m_lhs == rhs.m_lhs && m_rhs == rhs.m_rhs;
 }
 
@@ -135,12 +135,12 @@ std::ostream& var_assign_expression_node::print(std::ostream& os) const {
 }
 
 bool var_assign_expression_node::equal(const node& rhsNode) const {
-    const auto& rhs = reinterpret_cast<const var_assign_expression_node&>(rhsNode);
+    const auto& rhs = dynamic_cast<const var_assign_expression_node&>(rhsNode);
     return expression_node::equal(rhsNode) && m_compound == rhs.m_compound && m_lhs == rhs.m_lhs && m_rhs == rhs.m_rhs;
 }
 
 bool declaration_node::equal(const node& rhs) const {
-    return declaration_type() == reinterpret_cast<const declaration_node&>(rhs).declaration_type();
+    return declaration_type() == dynamic_cast<const declaration_node&>(rhs).declaration_type();
 }
 
 void function_declaration_node::accept(visitor& visitor) const {
@@ -152,7 +152,7 @@ std::ostream& function_declaration_node::print(std::ostream& os) const {
 }
 
 bool function_declaration_node::equal(const node& rhs) const {
-    return declaration_node::equal(rhs) && p_name == reinterpret_cast<const function_declaration_node&>(rhs).p_name;
+    return declaration_node::equal(rhs) && p_name == dynamic_cast<const function_declaration_node&>(rhs).p_name;
 }
 
 void function_definition_node::accept(visitor& visitor) const {
@@ -171,12 +171,11 @@ std::ostream& function_definition_node::print(std::ostream& os) const {
 }
 
 bool function_definition_node::equal(const node& rhs) const {
-    return function_declaration_node::equal(rhs) &&
-           m_body == reinterpret_cast<const function_definition_node&>(rhs).m_body;
+    return function_declaration_node::equal(rhs) && m_body == dynamic_cast<const function_definition_node&>(rhs).m_body;
 }
 
 bool statement_node::equal(const node& rhs) const {
-    return statement_type() == reinterpret_cast<const statement_node&>(rhs).statement_type();
+    return statement_type() == dynamic_cast<const statement_node&>(rhs).statement_type();
 }
 
 void return_statement_node::accept(visitor& visitor) const {
@@ -190,7 +189,7 @@ std::ostream& return_statement_node::print(std::ostream& os) const {
 }
 
 bool return_statement_node::equal(const node& rhs) const {
-    return statement_node::equal(rhs) && m_value == reinterpret_cast<const return_statement_node&>(rhs).m_value;
+    return statement_node::equal(rhs) && m_value == dynamic_cast<const return_statement_node&>(rhs).m_value;
 }
 
 void if_statement_node::accept(visitor& visitor) const {
@@ -205,7 +204,7 @@ std::ostream& if_statement_node::print(std::ostream& os) const {
 }
 
 bool if_statement_node::equal(const node& rhsNode) const {
-    const auto& rhs = reinterpret_cast<const if_statement_node&>(rhsNode);
+    const auto& rhs = dynamic_cast<const if_statement_node&>(rhsNode);
     return statement_node::equal(rhs) && m_cond == rhs.m_cond && m_then == rhs.m_then && m_else == rhs.m_else;
 }
 
@@ -218,7 +217,7 @@ std::ostream& compound_statement_node::print(std::ostream& os) const {
 }
 
 bool compound_statement_node::equal(const node& rhs) const {
-    return statement_node::equal(rhs) && m_body == reinterpret_cast<const compound_statement_node&>(rhs).m_body;
+    return statement_node::equal(rhs) && m_body == dynamic_cast<const compound_statement_node&>(rhs).m_body;
 }
 
 void program_node::accept(visitor& visitor) const {
@@ -240,7 +239,7 @@ std::ostream& program_node::print(std::ostream& os) const {
 }
 
 bool program_node::equal(const node& rhs) const {
-    return m_declarations == reinterpret_cast<const program_node&>(rhs).m_declarations;
+    return m_declarations == dynamic_cast<const program_node&>(rhs).m_declarations;
 }
 
 std::ostream& operator<<(std::ostream& os, const body& body) {

furc/src/front/parser.cpp

@@ -31,7 +31,7 @@ parser::parser(std::string_view filename)
 }
 
 ast::program_node_r parser::parse() & {
-    auto program = m_arena.allocate_shared<ast::program_node>();
+    auto program = m_arena.allocate_shared<ast::program_node>(location{ m_filename });
 
     while (peek_token().has_value()) {
         program->push(std::move(parse_declaration()));
@@ -61,11 +61,11 @@ ast::declaration_node_r parser::parse_declaration() {
             case token_t::LBrace: {
                 ast::body_r body = parse_body();
                 if (body.has_error()) return ast::declaration_node_r(ast::error{ body.error().location });
-                return m_arena.allocate_shared<ast::function_definition_node>(*name, std::move(body));
+                return m_arena.allocate_shared<ast::function_definition_node>(first->location, *name, std::move(body));
             }
             case token_t::Semicolon: {
                 m_peekBuffer.clear();
-                return m_arena.allocate_shared<ast::function_declaration_node>(*name);
+                return m_arena.allocate_shared<ast::function_declaration_node>(first->location, *name);
             }
             default: return ast::declaration_node_r(ast::error{ tok->location });
             }
@@ -101,13 +101,13 @@ ast::statement_node_r parser::parse_statement() {
             auto tok = next_token();
             if (peek_token()->type == token_t::Semicolon) {
                 next_token();
-                return m_arena.allocate_shared<ast::return_statement_node>();
+                return m_arena.allocate_shared<ast::return_statement_node>(location);
             }
 
             auto value = parse_expression();
             auto err   = eat_token(token_t::Semicolon);
             if (err.has_error()) return ast::statement_node_r(ast::error{ err.error().location });
-            return m_arena.allocate_shared<ast::return_statement_node>(std::move(value));
+            return m_arena.allocate_shared<ast::return_statement_node>(location, std::move(value));
         }
         case keyword_token::If: {
             auto tok = next_token();
@@ -126,19 +126,20 @@ ast::statement_node_r parser::parse_statement() {
                 peek_token()->value.keyword == keyword_token::Else) {
                 next_token();
 
-                return m_arena.allocate_shared<ast::if_statement_node>(std::move(cond),
+                return m_arena.allocate_shared<ast::if_statement_node>(location,
+                    std::move(cond),
                     std::move(then),
                     std::move(parse_statement()));
             }
 
-            return m_arena.allocate_shared<ast::if_statement_node>(std::move(cond), std::move(then));
+            return m_arena.allocate_shared<ast::if_statement_node>(location, std::move(cond), std::move(then));
         }
         case keyword_token::None:
         case keyword_token::Func:
         default: break;
         }
     }
-    case token_t::LBrace: return m_arena.allocate_shared<ast::compound_statement_node>(parse_body());
+    case token_t::LBrace: return m_arena.allocate_shared<ast::compound_statement_node>(location, parse_body());
     default: break;
     }
 
@@ -165,12 +166,12 @@ ast::literal_node_r parser::parse_literal() {
     case token_t::String: {
         auto tok = next_token();
         if (tok.has_error()) return ast::literal_node_r(ast::error{ tok.error().location });
-        return m_arena.allocate_shared<ast::string_literal_node>((*tok)->string);
+        return m_arena.allocate_shared<ast::string_literal_node>(tok->location, (*tok)->string);
     }
     case token_t::Integer: {
         auto tok = next_token();
         if (tok.has_error()) return ast::literal_node_r(ast::error{ tok.error().location });
-        return m_arena.allocate_shared<ast::integer_literal_node>((*tok)->integer);
+        return m_arena.allocate_shared<ast::integer_literal_node>(tok->location, (*tok)->integer);
     }
     default: break;
     }
@@ -184,7 +185,7 @@ ast::expression_node_r parser::parse_expression_primary() {
     case token_t::Identifier: {
         auto tok = next_token();
         if (tok.has_error()) return ast::expression_node_r(ast::error{ tok.error().location });
-        return m_arena.allocate_shared<ast::var_read_expression_node>((*tok)->string);
+        return m_arena.allocate_shared<ast::var_read_expression_node>(tok->location, (*tok)->string);
     }
     case token_t::LParen: {
         auto tok  = next_token();
@@ -230,7 +231,8 @@ ast::expression_node_r parser::parse_expression_unary(std::uint32_t precedence)
             expression = parse_expression_unary(current.precedence + 1);
         }
 
-        result = m_arena.allocate_shared<ast::unaryop_expression_node>(current.type, std::move(expression));
+        result =
+            m_arena.allocate_shared<ast::unaryop_expression_node>(token->location, current.type, std::move(expression));
     }
 
     if (result == nullptr) return parse_expression_primary();
@@ -341,13 +343,18 @@ ast::expression_node_r parser::parse_expression_rhs(ast::expression_node_r&& ini
 
         switch (current.type) {
         case rhsop_info_t::Unaryop:
-            lhs = m_arena.allocate_shared<ast::unaryop_expression_node>(current.unary, std::move(lhs));
+            lhs =
+                m_arena.allocate_shared<ast::unaryop_expression_node>(opToken->location, current.unary, std::move(lhs));
             break;
         case rhsop_info_t::Binop:
-            lhs = m_arena.allocate_shared<ast::binop_expression_node>(current.binary, std::move(lhs), std::move(rhs));
+            lhs = m_arena.allocate_shared<ast::binop_expression_node>(opToken->location,
+                current.binary,
+                std::move(lhs),
+                std::move(rhs));
             break;
         case rhsop_info_t::Assignment:
-            lhs = m_arena.allocate_shared<ast::var_assign_expression_node>(current.assignment,
+            lhs = m_arena.allocate_shared<ast::var_assign_expression_node>(opToken->location,
+                current.assignment,
                 std::move(lhs),
                 std::move(rhs));
             break;