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

Text File | 1998-01-16 | 5.9 KB | 286 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 BIT_CONSTANT
--
-- For Manifest Constant BIT_N.
--

inherit EXPRESSION;

creation {EIFFEL_PARSER} make

feature

   start_position: POSITION;

   value: STRING;

   result_type: TYPE_BIT_1;

feature {NONE}

   id: INTEGER;

feature

   use_current: BOOLEAN is false;

   is_static: BOOLEAN is false;

   is_pre_computable: BOOLEAN is false;

   can_be_dropped: BOOLEAN is true;

   c_simple: BOOLEAN is true;

feature {NONE}

   make(sp: like start_position; s: STRING) is
      require
     s /= Void
     -- `s' contains only '0' and '1'.
      do
     start_position := sp;
     value := s;
      ensure
     value.count = s.count
      end;

feature

   isa_dca_inline_argument: INTEGER is
     -- *** FAIRE ***
      do
      end;

   dca_inline_argument(formal_arg_type: TYPE) is
     -- *** FAIRE ***
      do
      end;

   frozen afd_check is do end;

   frozen mapping_c_target(target_type: TYPE) is
      do
     mapping_c_arg(target_type);
      end;

   frozen mapping_c_arg(formal_arg_type: TYPE) is
      do
     compile_to_c;
      end;

   compile_to_c is
      local
     tb: TYPE_BIT;
     nb: INTEGER;
     ib: INTEGER;
      do
     tb := result_type;
     ib := Integer_bits
     if tb.is_c_unsigned_ptr then
        compute_c_to_bit;
        cpp.put_character('(');
        cpp.put_character('(');
        cpp.put_string(fz_unsigned);
        cpp.put_character('*');
        cpp.put_character(')');
        cpp.put_string_c(to_bit);
        cpp.put_character(')');
     else
        to_bit.copy(value);
        if tb.is_c_char then
           nb := Character_bits;
        else
           nb := Integer_bits;
        end;
        from
        until
           to_bit.count = nb
        loop
           to_bit.extend('0');
        end;
        cpp.put_integer(to_bit.binary_to_integer);
     end;
      end;

   compile_to_c_old is do end;

   compile_to_jvm_old is do end;

   compile_target_to_jvm, compile_to_jvm is
      local
     i, idx: INTEGER;
     ca: like code_attribute;
     cp: like constant_pool;
      do
     ca := code_attribute;
     cp := constant_pool;
     idx := cp.idx_class2(fz_a0);
     ca.opcode_new(idx);
     ca.opcode_dup;
     ca.opcode_push_integer(value.count);
     idx := cp.idx_methodref3(fz_a0,fz_35,fz_27);
     ca.opcode_invokespecial(idx,0);
     from
        i := value.count;
     until
        i = 0
     loop
        if value.item(i) = '1' then
           ca.opcode_dup;
           ca.opcode_push_integer(i - 1);
           idx := cp.idx_methodref3(fz_a0,fz_a4,fz_27);
           ca.opcode_invokevirtual(idx,-2);
        end;
        i := i - 1;
     end;
      end;

   compile_to_jvm_assignment(a: ASSIGNMENT) is
      do
      end;

   jvm_branch_if_false: INTEGER is
      do
      end;

   jvm_branch_if_true: INTEGER is
      do
      end;

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

   to_runnable(ct: TYPE): like Current is
      local
     ic: INTEGER_CONSTANT;
      do
     if current_type = Void then
        current_type := ct;
        if result_type = Void then
           !!ic.make(value.count,start_position);
           !!result_type.make(start_position,ic);
           result_type.run_class.set_at_run_time;
        end;
        Result := Current;
     else
        Result := twin;
        Result.set_current_type(Void);
        Result := Result.to_runnable(ct);
     end;
      end;

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

   to_string: STRING is
      do
     Result := value.twin;
     Result.extend('B');
      end;

   bracketed_pretty_print, pretty_print is
      do
     fmt.put_string(value);
     fmt.put_character('B');
      end;

   print_as_target is
      do
     fmt.put_character('(');
     pretty_print;
     fmt.put_character(')');
     fmt.put_character('.');
      end;

   short is
      local
     i: INTEGER;
      do
     from
        i := 1;
     until
        i > value.count
     loop
        short_print.a_character(value.item(i));
        i := i + 1;
     end;
     short_print.a_character('B');
      end;

   short_target is
      do
     bracketed_short;
     short_print.a_dot;
      end;

feature {NONE}

   compute_c_to_bit is
     -- Compute in `to_bit' the C string view `value'.
      local
     char_bit: STRING;
     i_to_bit, i_value: INTEGER;
      do
     from
        i_to_bit := value.count // Integer_bits;
        if (value.count \\ Integer_bits) /= 0 then
           i_to_bit := i_to_bit + 1;
        end;
        i_to_bit := i_to_bit * (Integer_bits // Character_bits);
        to_bit.clear;
        char_bit := "01010101";
        i_value := 1;
     until
        i_to_bit = 0
     loop
        from
           char_bit.clear;
        until
           char_bit.count = Character_bits
        loop
           if i_value <= value.count then
          char_bit.extend(value.item(i_value));
           else
          char_bit.extend('0');
           end;
           i_value := i_value + 1;
        end;
        to_bit.extend(char_bit.binary_to_integer.to_character);
        i_to_bit := i_to_bit - 1;
     end;
      end;

   to_bit: STRING is
      once
     !!Result.make(16);
      end;

feature {CREATION_CALL,EXPRESSION_WITH_COMMENT}

   jvm_assign is
      do
      end;

end -- BIT_CONSTANT