typedef struct translation_unit_t translation_unit_t;
-void init_ast(void);
-void exit_ast(void);
+/**
+ * Initialize the AST construction.
+ */
+void init_ast(void);
+
+/**
+ * Free the AST.
+ */
+void exit_ast(void);
+
+void print_expression(const expression_t *expression);
+void print_initializer(const initializer_t *initializer);
+void print_ast(const translation_unit_t *unit);
+void print_indent(void);
+void print_declaration(const entity_t *entity);
+void print_entity(const entity_t *entity);
+void change_indent(int delta);
-void print_expression(const expression_t *expression);
-void print_initializer(const initializer_t *initializer);
-void print_ast(const translation_unit_t *unit);
-void print_indent(void);
-void print_declaration(const entity_t *entity);
-void print_entity(const entity_t *entity);
-void change_indent(int delta);
-void *allocate_ast(size_t size);
+typedef enum expression_classification_t {
+ EXPR_CLASS_VARIABLE,
+ EXPR_CLASS_ERROR,
+ EXPR_CLASS_CONSTANT
+} expression_classification_t;
/**
* Returns true if a given expression is a compile time
*
* @param expression the expression to check
*/
-bool is_constant_initializer(const initializer_t *initializer);
+expression_classification_t is_constant_initializer(const initializer_t *initializer);
/**
* Returns true if a given expression is a compile time
*
* @param expression the expression to check
*/
-bool is_constant_expression(const expression_t *expression);
+expression_classification_t is_constant_expression(const expression_t *expression);
/**
- * An object with a fixed but at compiletime unknown adress which will be known
- * at link/load time.
+ * Checks if an expression is a constant/known value to the linker. Examples:
+ * - all constant expression casted to a pointer type
+ * - "&x", with x being a global variable.
+ * - "array" or "a.array" in case array is an array and array and a,
+ * respectively is an object with link time constant address
*/
-bool is_address_constant(const expression_t *expression);
+expression_classification_t is_linker_constant(const expression_t *expression);
long fold_constant_to_int(const expression_t *expression);
bool fold_constant_to_bool(const expression_t *expression);
+bool constant_is_negative(const expression_t *constant);
/**
* the type of a literal is usually the biggest type that can hold the value.