Amiga ACS 1998 #4/amigaacscoverdisc1998-041998.iso/utilities/shareware/dev/ppcsmalleiffel/lib_se/e_current.e

Text File | 1998-01-16 | 4.8 KB | 228 lines

--          This file is part of SmallEiffel The GNU Eiffel Compiler.
--          Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
--            Dominique COLNET and Suzanne COLLIN - [e-mail]
--                       http://www.loria.fr/SmallEiffel
-- SmallEiffel is  free  software;  you can  redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the Free
-- Software  Foundation;  either  version  2, or (at your option)  any  later
-- version. SmallEiffel is distributed in the hope that it will be useful,but
-- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-- or  FITNESS FOR A PARTICULAR PURPOSE.   See the GNU General Public License
-- for  more  details.  You  should  have  received a copy of the GNU General
-- Public  License  along  with  SmallEiffel;  see the file COPYING.  If not,
-- write to the  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class E_CURRENT
   --
   -- Handling of the pseudo variable "Current".
   --

inherit
   NAME
      redefine pretty_print
      end;
   EXPRESSION
      redefine pretty_print, is_current
      end;

creation make

feature

   is_written: BOOLEAN;
     -- True when it is a really written Current.

   start_position: POSITION;

feature {NONE}

   make(sp: like start_position; written: BOOLEAN) is
      require
     sp /= Void
      do
     start_position := sp;
     is_written := written;
     to_string := us_current;
      ensure
     start_position = sp;
     is_written = written
      end;

feature

   is_current, can_be_dropped, use_current: BOOLEAN is true;

   is_static: BOOLEAN is false;

   is_pre_computable: BOOLEAN is false;

   isa_dca_inline_argument: INTEGER is 0;

feature

   to_key: STRING is
      do
     Result := to_string;
      end;

   dca_inline_argument(formal_arg_type: TYPE) is
      do
      end;

   frozen mapping_c_target(target_type: TYPE) is
      local
     flag: BOOLEAN;
      do
     if is_written then
        flag := cpp.call_invariant_start(target_type);
     end;
     cpp.print_current;
     if flag then
        cpp.call_invariant_end;
     end;
      end;

   frozen mapping_c_arg(formal_arg_type: TYPE) is
      local
     rt: like result_type;
      do
     rt := result_type.run_type;
     if rt.is_reference then
        if formal_arg_type.is_reference then
           -- Reference into Reference :
           cpp.put_string(fz_cast_t0_star);
           cpp.print_current;
        else
           -- Reference into Expanded :
           rt.to_expanded;
           cpp.put_character('(');
           cpp.print_current;
           cpp.put_character(')');
        end;
     else
        if formal_arg_type.is_reference then
           -- Expanded into Reference :
           rt.to_reference;
           cpp.put_character('(');
           cpp.print_current;
           cpp.put_character(')');
        else
           -- Expanded into Expanded :
           cpp.print_current;
        end;
     end;
      end;

   compile_to_c_old is
      do
      end;

   compile_to_jvm_old is
      do
      end;

   compile_to_c is
      do
     if result_type.is_user_expanded then
        cpp.put_character('*');
     end;
     cpp.print_current;
      end;

   compile_to_jvm is
      do
     result_type.jvm_push_local(0);
      end;

   compile_target_to_jvm is
      do
     if is_written then
        standard_compile_target_to_jvm;
     else
        compile_to_jvm;
     end;
      end;

   compile_to_jvm_assignment(a: ASSIGNMENT) is
      do
      end;

   jvm_branch_if_false: INTEGER is
      do
     compile_to_jvm;
     Result := code_attribute.opcode_ifeq;
      end;

   jvm_branch_if_true: INTEGER is
      do
     compile_to_jvm;
     Result := code_attribute.opcode_ifne;
      end;

   compile_to_jvm_into(dest: TYPE): INTEGER is
      do
     Result := standard_compile_to_jvm_into(dest);
      end;

   result_type: TYPE is
      do
     Result := current_type;
      end;

   to_runnable(ct: TYPE): like Current is
      do
     if current_type = Void then
        current_type := ct;
        Result := Current
     elseif current_type = ct then
        Result := Current
     else
        !!Result.make(start_position,is_written);
        Result.set_current_type(ct);
     end;
      end;

   precedence: INTEGER is
      do
     Result := atomic_precedence;
      end;

   pretty_print is
      do
     fmt.put_string(us_current);
      end;

   print_as_target is
      do
     if is_written or else fmt.print_current then
        fmt.put_string(us_current);
        fmt.put_character('.');
     end;
      end;

   short is
      do
     short_print.hook_or(us_current,us_current);
      end;

   short_target is
      do
     if is_written then
        short;
        short_print.a_dot;
     end;
      end;
feature {CREATION_CALL,EXPRESSION_WITH_COMMENT}

   jvm_assign is
      do
      end;

invariant

   start_position /= Void;

end -- E_CURRENT