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Eugen Wissner
2024-12-21 00:08:48 +01:00
commit 72681e349a
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483
include/elna/source/ast.hpp Normal file
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#pragma once
#include <memory>
#include "elna/source/result.hpp"
#include "elna/source/types.hpp"
namespace elna::source
{
enum class binary_operator
{
sum,
subtraction,
multiplication,
division,
equals,
not_equals,
less,
greater,
less_equal,
greater_equal
};
enum class unary_operator
{
reference,
dereference
};
class declaration;
class constant_definition;
class procedure_definition;
class call_statement;
class compound_statement;
class assign_statement;
class if_statement;
class while_statement;
class block;
class program;
class binary_expression;
class unary_expression;
class type_expression;
class variable_expression;
class integer_literal;
class boolean_literal;
/**
* Interface for AST visitors.
*/
struct parser_visitor
{
virtual void visit(declaration *) = 0;
virtual void visit(constant_definition *) = 0;
virtual void visit(procedure_definition *) = 0;
virtual void visit(call_statement *) = 0;
virtual void visit(compound_statement *) = 0;
virtual void visit(assign_statement *) = 0;
virtual void visit(if_statement *) = 0;
virtual void visit(while_statement *) = 0;
virtual void visit(block *) = 0;
virtual void visit(program *) = 0;
virtual void visit(binary_expression *) = 0;
virtual void visit(unary_expression *) = 0;
virtual void visit(type_expression *) = 0;
virtual void visit(variable_expression *) = 0;
virtual void visit(integer_literal *) = 0;
virtual void visit(boolean_literal *) = 0;
};
/**
* A visitor which visits all nodes but does nothing.
*/
struct empty_visitor : parser_visitor
{
virtual void visit(declaration *declaration) override;
virtual void visit(constant_definition *definition) override;
virtual void visit(procedure_definition *definition) override;
virtual void visit(call_statement *statement) override;
virtual void visit(compound_statement *statement) override;
virtual void visit(assign_statement *statement) override;
virtual void visit(if_statement *) override;
virtual void visit(while_statement *) override;
virtual void visit(block *block) override;
virtual void visit(program *program) override;
virtual void visit(binary_expression *expression) override;
virtual void visit(unary_expression *expression) override;
virtual void visit(type_expression *variable) override;
virtual void visit(variable_expression *variable) override;
virtual void visit(integer_literal *number) override;
virtual void visit(boolean_literal *boolean) override;
};
/**
* Operand representing a subexpression in the 3 address code.
*/
struct operand
{
public:
virtual ~operand() noexcept = 0;
};
struct integer_operand final : public operand
{
std::int32_t m_value;
public:
explicit integer_operand(const std::int32_t value);
std::int32_t value() const noexcept;
};
class variable_operand final : public operand
{
std::string m_name;
public:
explicit variable_operand(const std::string& name);
const std::string& name() const noexcept;
};
struct temporary_variable final : public operand
{
std::size_t m_counter;
public:
explicit temporary_variable(const std::size_t counter);
std::size_t counter() const noexcept;
};
struct label_operand final : public operand
{
std::size_t m_counter;
public:
explicit label_operand(const std::size_t counter);
std::size_t counter() const noexcept;
};
/**
* AST node.
*/
class node
{
const struct position source_position;
protected:
/**
* \param position Source code position.
*/
explicit node(const position position);
public:
virtual ~node() noexcept = default;
virtual void accept(parser_visitor *) = 0;
/**
* \return Node position in the source code.
*/
const struct position& position() const noexcept;
};
class statement : public node
{
protected:
/**
* \param position Source code position.
*/
explicit statement(const struct position position);
};
class expression : public node
{
public:
std::shared_ptr<operand> place;
std::shared_ptr<const type> data_type;
protected:
/**
* \param position Source code position.
*/
explicit expression(const struct position position);
};
/**
* Symbol definition.
*/
class definition : public node
{
std::string m_identifier;
protected:
/**
* Constructs a definition identified by some name.
*
* \param position Source code position.
* \param identifier Definition name.
*/
definition(const struct position position, const std::string& identifier);
public:
/**
* \return Definition name.
*/
std::string& identifier() noexcept;
};
/**
* Expression defining a composed type like pointer or an array.
*/
class type_expression : public node
{
std::string m_base;
bool m_pointer{ false };
public:
/**
* \param position Source code position.
* \param name Type name.
* \param is_pointer Whether it is a pointer type.
*/
type_expression(const struct position position, const std::string& name, const bool is_pointer = false);
virtual void accept(parser_visitor *visitor) override;
/**
* \return Name of the base type.
*/
const std::string& base() const noexcept;
/**
* \return Whether the type is a pointer.
*/
bool is_pointer() const noexcept;
};
/**
* Variable declaration.
*/
class declaration : public definition
{
std::unique_ptr<type_expression> m_type;
public:
/**
* Constructs a declaration with a name and a type.
*
* \param position Source code position.
* \param identifier Definition name.
* \param type Declared type.
*/
declaration(const struct position position, const std::string& identifier,
std::unique_ptr<type_expression>&& type);
virtual void accept(parser_visitor *visitor) override;
type_expression& type() noexcept;
};
/**
* Constant definition.
*/
class constant_definition : public definition
{
std::unique_ptr<integer_literal> m_body;
public:
/**
* \param position Source code position.
* \param identifier Constant name.
* \param body Constant value.
*/
constant_definition(const struct position position, const std::string& identifier,
std::unique_ptr<integer_literal>&& body);
virtual void accept(parser_visitor *visitor) override;
integer_literal& body();
};
/**
* Procedure definition.
*/
class procedure_definition : public definition
{
std::unique_ptr<block> m_body;
std::vector<std::unique_ptr<declaration>> m_parameters;
public:
/**
* \param position Source code position.
* \param identifier Procedure name.
* \param body Procedure body.
*/
procedure_definition(const struct position position, const std::string& identifier,
std::unique_ptr<block>&& body);
virtual void accept(parser_visitor *visitor) override;
block& body();
std::vector<std::unique_ptr<declaration>>& parameters() noexcept;
};
/**
* Call statement.
*/
class call_statement : public statement
{
std::string m_name;
std::vector<std::unique_ptr<expression>> m_arguments;
public:
/**
* \param position Source code position.
* \param name Callable's name.
*/
call_statement(const struct position position, const std::string& name);
virtual void accept(parser_visitor *visitor) override;
std::string& name() noexcept;
std::vector<std::unique_ptr<expression>>& arguments() noexcept;
};
class compound_statement : public statement
{
std::vector<std::unique_ptr<statement>> m_statements;
public:
explicit compound_statement(const struct position position);
virtual void accept(parser_visitor *visitor) override;
std::vector<std::unique_ptr<statement>>& statements();
};
class assign_statement : public statement
{
std::string m_lvalue;
std::unique_ptr<expression> m_rvalue;
public:
/**
* \param position Source code position.
* \param lvalue Left-hand side.
* \param rvalue Assigned expression.
*/
assign_statement(const struct position position, const std::string& lvalue,
std::unique_ptr<expression>&& rvalue);
virtual void accept(parser_visitor *visitor) override;
std::string& lvalue() noexcept;
expression& rvalue();
};
/**
* If-statement.
*/
class if_statement : public statement
{
std::unique_ptr<expression> m_prerequisite;
std::unique_ptr<statement> m_body;
public:
/**
* \param position Source code position.
* \param prerequisite Condition.
* \param body Statement executed if the condition is met.
*/
if_statement(const struct position position, std::unique_ptr<expression>&& prerequisite,
std::unique_ptr<statement>&& body);
virtual void accept(parser_visitor *visitor) override;
expression& prerequisite();
statement& body();
};
/**
* While-statement.
*/
class while_statement : public statement
{
std::unique_ptr<expression> m_prerequisite;
std::unique_ptr<statement> m_body;
public:
/**
* \param position Source code position.
* \param prerequisite Condition.
* \param body Statement executed while the condition is met.
*/
while_statement(const struct position position, std::unique_ptr<expression>&& prerequisite,
std::unique_ptr<statement>&& body);
virtual void accept(parser_visitor *visitor) override;
expression& prerequisite();
statement& body();
};
class block : public node
{
std::unique_ptr<statement> m_body;
std::vector<std::unique_ptr<definition>> m_definitions;
std::vector<std::unique_ptr<declaration>> m_declarations;
public:
block(const struct position position, std::vector<std::unique_ptr<definition>>&& definitions,
std::vector<std::unique_ptr<declaration>>&& declarations,
std::unique_ptr<statement>&& body);
virtual void accept(parser_visitor *visitor) override;
statement& body();
std::vector<std::unique_ptr<definition>>& definitions() noexcept;
std::vector<std::unique_ptr<declaration>>& declarations() noexcept;
};
class program : public block
{
public:
program(const struct position position, std::vector<std::unique_ptr<definition>>&& definitions,
std::vector<std::unique_ptr<declaration>>&& declarations,
std::unique_ptr<statement>&& body);
virtual void accept(parser_visitor *visitor) override;
};
class integer_literal : public expression
{
std::int32_t m_number;
public:
integer_literal(const struct position position, const std::int32_t value);
virtual void accept(parser_visitor *visitor) override;
std::int32_t number() const noexcept;
};
class boolean_literal : public expression
{
bool m_boolean;
public:
boolean_literal(const struct position position, const bool value);
virtual void accept(parser_visitor *visitor) override;
bool boolean() const noexcept;
};
class variable_expression : public expression
{
std::string m_name;
public:
variable_expression(const struct position position, const std::string& name);
virtual void accept(parser_visitor *visitor) override;
const std::string& name() const noexcept;
};
class binary_expression : public expression
{
std::unique_ptr<expression> m_lhs;
std::unique_ptr<expression> m_rhs;
binary_operator m_operator;
public:
binary_expression(const struct position position, std::unique_ptr<expression>&& lhs,
std::unique_ptr<expression>&& rhs, const unsigned char operation);
virtual void accept(parser_visitor *visitor) override;
expression& lhs();
expression& rhs();
binary_operator operation() const noexcept;
};
class unary_expression : public expression
{
std::unique_ptr<expression> m_operand;
unary_operator m_operator;
public:
unary_expression(const struct position position, std::unique_ptr<expression>&& operand,
const unsigned char operation);
virtual void accept(parser_visitor *visitor) override;
expression& operand();
unary_operator operation() const noexcept;
};
}

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include/elna/source/result.hpp Normal file
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#pragma once
#include <cstddef>
#include <filesystem>
namespace elna::source
{
/**
* Position in the source text.
*/
struct position
{
/// Line.
std::size_t line = 1;
/// Column.
std::size_t column = 1;
};
/**
* A compilation error consists of an error message and position.
*/
class error
{
position m_position;
std::filesystem::path m_path;
protected:
/**
* Constructs an error.
*
* \param path Source file name.
* \param position Error position in the source text.
*/
error(const std::filesystem::path& path, const position position);
public:
virtual ~error() noexcept = default;
/// Error text.
virtual std::string what() const = 0;
/// Error line in the source text.
std::size_t line() const noexcept;
/// Error column in the source text.
std::size_t column() const noexcept;
/// Source file name.
const std::filesystem::path& path() const noexcept;
};
}

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include/elna/source/types.hpp Normal file
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#pragma once
#include <memory>
#include <string>
#include <vector>
namespace elna::source
{
/**
* Type representation.
*/
class type
{
const std::size_t byte_size;
protected:
/**
* Constructor.
*
* \param byte_size The type size in bytes.
*/
explicit type(const std::size_t byte_size);
public:
/**
* \return The type size in bytes.
*/
virtual std::size_t size() const noexcept;
friend bool operator==(const type& lhs, const type& rhs) noexcept;
friend bool operator!=(const type& lhs, const type& rhs) noexcept;
};
/**
* Built-in type representation.
*/
struct primitive_type : public type
{
/// Type name.
const std::string type_name;
/**
* Constructor.
*
* \param type_name Type name.
* \param byte_size The type size in bytes.
*/
primitive_type(const std::string& type_name, const std::size_t byte_size);
bool operator==(const primitive_type& that) const noexcept;
bool operator!=(const primitive_type& that) const noexcept;
};
/**
* Typed pointer.
*/
struct pointer_type : public type
{
/// Pointer target type.
std::shared_ptr<const type> base_type;
/**
* Constructor.
*
* \param base_type Pointer target type.
* \param byte_size The type size in bytes.
*/
pointer_type(std::shared_ptr<const type> base_type, const std::size_t byte_size);
bool operator==(const pointer_type& that) const noexcept;
bool operator!=(const pointer_type& that) const noexcept;
};
/**
* Type of a procedure.
*/
struct procedure_type : public type
{
/// Argument types.
std::vector<std::shared_ptr<const type>> arguments;
/**
* Constructor.
*
* \param arguments Argument types.
* \param byte_size Function pointer size.
*/
procedure_type(std::vector<std::shared_ptr<const type>> arguments, const std::size_t byte_size);
bool operator==(const procedure_type& that) const noexcept;
bool operator!=(const procedure_type& that) const noexcept;
};
bool operator==(const type& lhs, const type& rhs) noexcept;
bool operator!=(const type& lhs, const type& rhs) noexcept;
inline const primitive_type boolean_type{ "Boolean", 1 };
inline const primitive_type int_type{ "Int", 4 };
}