CU Amiga Super CD-ROM 22/CU Amiga Magazine's Super CD-ROM 22 (1998)(EMAP Images)(GB)[!][issue 1998-05].iso/PowerPC/Programming/PPCSmallEiffel/lib_se/call_infix_eq.e

Text File | 1998-01-16 | 4.9 KB | 194 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 CALL_INFIX_EQ
   --
   --   Infix operator : "=".
   --

inherit CALL_INFIX_EQ_NEQ;

creation make

feature

   operator: STRING is
      do
     Result := us_eq;
      end;

   is_static: BOOLEAN is
      do
     if target.is_void then
        Result := is_static_eq_void(arg1);
     elseif arg1.is_void then
        Result := is_static_eq_void(target);
     elseif target.is_static and then arg1.is_static then
        Result := true;
        if target.static_value = arg1.static_value then
           static_value_mem := 1;
        end;
     end;
      end;

   compile_to_c is
      local
     tt, at: TYPE;
      do
     tt := target.result_type.run_type;
     at := arg1.result_type.run_type;
     if tt.is_expanded then
        if at.is_expanded then -- ------------- Expanded/Expanded :
           if tt.is_user_expanded then
          cmp_user_expanded(true,tt);
           elseif tt.is_basic_eiffel_expanded then
          cmp_basic_eiffel_expanded(true,at,tt);
           elseif tt.is_bit then
          cmp_bit(true,tt);
           else -- NATIVE_ARRAY
          cmp_basic_ref(true);
           end;
        else -- ------------------------------- Expanded/Reference :
           c2c_exp_ref(target,tt,arg1,at);
        end;
     elseif at.is_expanded then -- ----------- Reference/Expanded :
        c2c_exp_ref(arg1,at,target,tt);
     else -- ---------------------------- Reference/Reference :
        cmp_basic_ref(true);
     end;
      end;

feature {NONE}

   c2c_exp_ref(e: EXPRESSION; et: TYPE; r: EXPRESSION; rt: TYPE) is
      do
     if r.is_void then
        cpp.put_string("((");
        e.compile_to_c;
        cpp.put_string("),0)");
     else
        cpp.put_string("((");
        e.compile_to_c;
        cpp.put_string("),(");
        r.compile_to_c;
        cpp.put_string("),0)");
     end;
      end;

feature {NONE}

   is_static_eq_void(e: EXPRESSION): BOOLEAN is
      local
     rt: TYPE;
      do
     if e.is_current then
        Result := true;
     elseif e.is_manifest_string then
        Result := true;
     elseif is_manifest_array(e) then
        Result := true;
     else
        rt := e.result_type.run_type;
        if rt.is_expanded then
           if e.can_be_dropped then
          Result := true;
           end;
        elseif e.is_static then
           if e.static_value = 0 then
          Result := true;
          static_value_mem := 1;
           end;
        end;
     end;
      end;

feature

   compile_to_jvm is
      local
     space, point1, point2: INTEGER;
     rt: TYPE;
     rc: RUN_CLASS;
      do
     if target.is_void then
        jvm_void_cmp(arg1);
     elseif arg1.is_void then
        jvm_void_cmp(target);
     else
        rt := target.result_type.smallest_ancestor(arg1.result_type);
        space := target.compile_to_jvm_into(rt);
        space := arg1.compile_to_jvm_into(rt);
        if rt.is_user_expanded then
           rc := rt.run_class;
           jvm_standard_is_equal_aux(rc,rc.writable_attributes);
        else
           point1 := rt.jvm_if_x_eq;
           code_attribute.opcode_iconst_0;
           point2 := code_attribute.opcode_goto;
           code_attribute.resolve_u2_branch(point1);
           code_attribute.opcode_iconst_1;
           code_attribute.resolve_u2_branch(point2);
        end;
     end;
      end;

   jvm_branch_if_false: INTEGER is
      do
     Result := jvm_standard_branch_if_false;
      end;

   jvm_branch_if_true: INTEGER is
      do
     Result := jvm_standard_branch_if_true;
      end;

feature {NONE}

   jvm_void_cmp(e: EXPRESSION) is
      local
     rt: TYPE;
     point1, point2: INTEGER;
     space: INTEGER;
      do
     rt := e.result_type.run_type;
     if rt.is_expanded then
        e.compile_to_jvm;
        from
           space := rt.jvm_stack_space;
        until
           space = 0
        loop
           code_attribute.opcode_pop;
           space := space - 1;
        end;
        code_attribute.opcode_iconst_0;
     else
        e.compile_to_jvm;
        point1 := code_attribute.opcode_ifnull;
        code_attribute.opcode_iconst_0;
        point2 := code_attribute.opcode_goto;
        code_attribute.resolve_u2_branch(point1);
        code_attribute.opcode_iconst_1;
        code_attribute.resolve_u2_branch(point2);
     end;
      end;

invariant

   run_feature = Void;

end -- CALL_INFIX_EQ