Go to the first, previous, next, last section, table of contents.

5.8 Goto Statements

  1. A goto_statement specifies an explicit transfer of control from this statement to a target statement with a given label.


  2. goto_statement ::= goto label_name;

    Name Resolution Rules

  3. The label_name shall resolve to denote a label; the statement with that label is the target statement.

    Legality Rules

  4. The innermost sequence_of_statements that encloses the target statement shall also enclose the goto_statement. Furthermore, if a goto_statement is enclosed by an accept_statement or a body, then the target statement shall not be outside this enclosing construct.

    Dynamic Semantics

  5. The execution of a goto_statement transfers control to the target statement, completing the execution of any compound_statement that encloses the goto_statement but does not enclose the target.


  6. (10) The above rules allow transfer of control to a statement of an enclosing sequence_of_statements but not the reverse. Similarly, they prohibit transfers of control such as between alternatives of a case_statement, if_statement, or select_statement; between exception_handlers; or from an exception_handler of a handled_sequence_of_statements back to its sequence_of_statements.


  7. Example of a loop containing a goto statement:
  8. <<Sort>>
    for I in 1 .. N-1 loop
       if A(I) > A(I+1) then
          Exchange(A(I), A(I+1));
          goto Sort;
       end if;
    end loop;

Go to the first, previous, next, last section, table of contents.