AmigActive 3/AACD03.BIN/AACD/Programming/sofa/archive/SmallEiffel.lha/SmallEiffel/lib_se/type_real.e

Text File | 1999-06-05 | 6KB | 244 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://SmallEiffel.loria.fr
-- 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 TYPE_REAL
--
-- For REAL declaration :
--        foo : REAL;
--

inherit
   TYPE_BASIC_EIFFEL_EXPANDED
      redefine is_real
      end;

creation make

feature

   is_real: BOOLEAN is true;

   id: INTEGER is 4;

feature

   make(sp: like start_position) is
      do
         !!base_class_name.make(as_real,sp);
      end;

   is_a(other: TYPE): BOOLEAN is
      do
         if other.is_real or else other.is_double then
            Result := true;
         elseif base_class.is_subclass_of(other.base_class) then
            Result := true;
            used_as_reference;
         elseif other.run_time_mark = as_double_ref then
            Result := true;
            type_double.used_as_reference;
         end;
         if not Result then
            eh.add_type(Current,fz_inako);
            eh.add_type(other,fz_dot);
         end;
      end;

   used_as_reference is
      once
         load_ref(as_real_ref);
      end;

   smallest_ancestor(other: TYPE): TYPE is
      local
         rto: TYPE;
      do
         rto := other.run_type;
         if rto.is_integer then
            Result := Current;
         elseif rto.is_real then
            Result := Current;
         elseif rto.is_double then
            Result := other;
         else
            Result := type_real_ref.smallest_ancestor(rto);
         end;
      end;

   space_for_variable, space_for_object: INTEGER is
      do
         Result := (0.0).object_size;
      end;

   to_runnable(rt: TYPE): like Current is
      do
         Result := Current;
         check_type;
      end;

   written_mark, run_time_mark: STRING is
      do
         Result := as_real;
      end;

   c_type_for_argument_in(str: STRING) is
      do
         str.extend('T');
         str.extend('4');
      end;

   cast_to_ref is
      do
         type_real_ref.mapping_cast;
      end;

   jvm_descriptor_in(str: STRING) is
      do
         str.extend('F');
      end;

   jvm_return_code is
      do
         code_attribute.opcode_freturn;
      end;

   jvm_push_local(offset: INTEGER) is
      do
         code_attribute.opcode_fload(offset);
      end;

   jvm_push_default: INTEGER is
      do
         code_attribute.opcode_fconst_0;
         Result := 1;
      end;

   jvm_write_local(offset: INTEGER) is
      do
         code_attribute.opcode_fstore(offset);
      end;

   jvm_xnewarray is
      do
         code_attribute.opcode_newarray(6);
      end;

   jvm_xastore is
      do
         code_attribute.opcode_fastore;
      end;

   jvm_xaload is
      do
         code_attribute.opcode_faload;
      end;

   jvm_if_x_eq: INTEGER is
      do
         code_attribute.opcode_fcmpg;
         Result := code_attribute.opcode_ifeq;
      end;

   jvm_if_x_ne: INTEGER is
      do
         code_attribute.opcode_fcmpg;
         Result := code_attribute.opcode_ifne;
      end;

   jvm_to_reference is
      local
         rc: RUN_CLASS;
         idx: INTEGER;
         ca: like code_attribute;
      do
         ca := code_attribute;
         rc := type_real_ref.run_class;
         rc.jvm_basic_new;
         ca.opcode_dup_x1;
         ca.opcode_swap;
         idx := rc.jvm_constant_pool_index;
         idx := constant_pool.idx_fieldref4(idx,as_item,fz_78);
         ca.opcode_putfield(idx,-2);
      end;

   jvm_expanded_from_reference(other: TYPE): INTEGER is
      local
         rc: RUN_CLASS;
         idx: INTEGER;
         ca: like code_attribute;
      do
         ca := code_attribute;
         rc := type_real_ref.run_class;
         rc.opcode_checkcast;
         idx := rc.jvm_constant_pool_index;
         idx := constant_pool.idx_fieldref4(idx,as_item,fz_78);
         ca.opcode_getfield(idx,0);
         Result := 1;
      end;

   jvm_convert_to(destination: TYPE): INTEGER is
      do
         Result := 1;
         if destination.is_reference then
            jvm_to_reference;
         elseif destination.is_double then
            code_attribute.opcode_f2d;
            Result := 2;
         elseif destination.is_real then
         else
            -- Validity error.
            check
               destination.is_integer
            end;
            code_attribute.opcode_f2i;
         end;
      end;

   to_reference is
      do
         cpp.to_reference(Current,type_real_ref);
      end;

   to_expanded is
      do
         cpp.to_expanded(Current,type_real_ref);
      end;

feature {NONE}

   check_type is
      -- Do some checking for type REAL.
      local
         bc: BASE_CLASS;
         rc: RUN_CLASS;
      once
         bc := base_class;
         if nb_errors = 0 then
            rc := run_class;
         end;
         if nb_errors = 0 then
            if not bc.is_expanded then
               error(start_position,"REAL must be expanded.");
            end;
         end;
      end;

invariant

   written_mark = as_real

end -- TYPE_REAL