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ifthen.e
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1999-06-05
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7KB
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232 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 - colnet@loria.fr
-- 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 IFTHEN
--
-- Note : it is not really a complete Eiffel INSTRUCTION.
-- It is just a small part of an IFTHENELSE.
--
inherit IF_GLOBALS;
creation make
feature
expression: EXPRESSION;
then_compound: COMPOUND;
-- Not Void if any.
feature {NONE}
current_type: TYPE;
-- Not Void when instruction is checked for.
point2: INTEGER;
-- To reach the end of IFTHENELSE.
feature
make(exp: like expression; tc: like then_compound) is
require
exp /= void;
do
expression := exp;
then_compound := tc;
ensure
expression = exp;
then_compound = tc;
end;
feature {IFTHENLIST}
afd_check is
do
expression.afd_check;
if then_compound /= Void then
then_compound.afd_check;
end;
end;
collect_c_tmp is
do
expression.collect_c_tmp;
end;
feature
compile_to_c(need_else: BOOLEAN): INTEGER is
local
trace: BOOLEAN;
do
if expression.is_static then
cpp.incr_static_expression_count;
if expression.static_value = 1 then
print_else(need_else);
cpp.put_string("{/*AT*/");
if then_compound /= Void then
then_compound.compile_to_c;
end;
cpp.put_string(fz_12);
Result := static_true;
else
cpp.put_string("/*AF*/");
Result := static_false;
end;
else
Result := non_static;
trace := not expression.c_simple and then run_control.no_check;
print_else(need_else);
cpp.put_string(fz_if);
cpp.put_character('(');
if trace then
cpp.trace_boolean_expression(expression);
else
expression.compile_to_c;
end;
cpp.put_character(')');
cpp.put_string(fz_11);
if then_compound /= Void then
then_compound.compile_to_c;
end;
cpp.put_string(fz_12);
end;
end;
compile_to_jvm: INTEGER is
local
point1: INTEGER;
do
if expression.is_static then
jvm.incr_static_expression_count;
if expression.static_value = 1 then
if then_compound /= Void then
then_compound.compile_to_jvm;
end;
Result := static_true;
else
Result := static_false;
end;
else
Result := non_static;
point1 := expression.jvm_branch_if_false;
if then_compound /= Void then
then_compound.compile_to_jvm;
end;
point2 := code_attribute.opcode_goto;
code_attribute.resolve_u2_branch(point1);
end;
ensure
(<<static_true,static_false,non_static>>).fast_has(Result)
end;
compile_to_jvm_resolve_branch: INTEGER is
do
if expression.is_static then
if expression.static_value = 1 then
Result := static_true;
else
Result := static_false;
end;
else
Result := non_static;
if point2 > 0 then
code_attribute.resolve_u2_branch(point2);
end;
end;
ensure
(<<static_true,static_false,non_static>>).fast_has(Result)
end;
use_current: BOOLEAN is
do
Result := expression.use_current;
if not Result and then then_compound /= Void then
Result := then_compound.use_current;
end;
end;
start_position: POSITION is
do
Result := expression.start_position;
end;
pretty_print is
do
fmt.level_incr;
fmt.set_semi_colon_flag(false);
expression.pretty_print;
fmt.level_decr;
fmt.keyword("then");
fmt.indent;
if then_compound /= Void then
then_compound.pretty_print;
end;
end;
to_runnable(ct: TYPE): like Current is
local
e: like expression;
tc: like then_compound;
t: TYPE;
do
if current_type = Void then
current_type := ct;
e := expression.to_runnable(ct)
if e = Void then
error(expression.start_position,
"Bad BOOLEAN expression.");
else
expression := e;
t := expression.result_type;
if not t.is_boolean then
eh.append("Expression of if/elseif must be BOOLEAN. ");
eh.add_type(expression.result_type,fz_is_not_boolean);
eh.add_position(expression.start_position);
eh.print_as_error;
end;
end;
if then_compound /= Void then
tc := then_compound.to_runnable(ct);
if tc /= Void then
then_compound := tc;
end;
end;
if nb_errors = 0 then
Result := Current;
end;
else
!!Result.make(expression,then_compound);
Result := Result.to_runnable(ct);
end;
end;
feature {NONE}
print_else(need_else: BOOLEAN) is
do
if need_else then
cpp.put_string(" else ");
end;
end;
invariant
expression /= Void;
end -- IFTHEN