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class_invariant.e
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1999-06-05
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-- 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 CLASS_INVARIANT
--
-- To store a `class invariant'.
--
inherit ASSERTION_LIST redefine pretty_print end;
creation make, make_runnable
feature
name: STRING is
do
Result := fz_invariant;
end;
pretty_print is
local
i: INTEGER;
do
fmt.set_indent_level(0);
if not fmt.zen_mode then
fmt.skip(1);
end;
fmt.keyword(name);
if header_comment /= Void then
header_comment.pretty_print;
end;
if list /= Void then
from
i := 1;
until
i > list.upper
loop
fmt.set_indent_level(1);
fmt.indent;
if not fmt.zen_mode then
fmt.skip(1);
end;
fmt.set_semi_colon_flag(true);
list.item(i).pretty_print;
i := i + 1;
end;
end;
end;
short(bc: BASE_CLASS) is
local
i: INTEGER;
do
bc.header_comment_for(Current);
short_print.hook_or("hook811","invariant%N");
if header_comment = Void then
short_print.hook_or("hook812","");
else
short_print.hook_or("hook813","");
header_comment.short("hook814"," -- ","hook815","%N");
short_print.hook_or("hook816","");
end;
if list = Void then
short_print.hook_or("hook817","");
else
short_print.hook_or("hook818","");
from
i := 1;
until
i = list.upper
loop
list.item(i).short("hook819"," ", -- before each assertion
"hook820","", -- no tag
"hook821","", -- before tag
"hook822",": ", -- after tag
"hook823","", -- no expression
"hook824","", -- before expression
"hook825",";", -- after expression except last
"hook826","%N", -- no comment
"hook827","", -- before comment
"hook828"," -- ", -- comment begin line
"hook829","%N", -- comment end of line
"hook830","", -- after comment
"hook831",""); -- end of each assertion
i := i + 1;
end;
list.item(i).short("hook819"," ", -- before each assertion
"hook820","", -- no tag
"hook821","", -- before tag
"hook822",": ", -- after tag
"hook823","", -- no expression
"hook824","", -- before expression
"hook832",";", -- after last expression
"hook826","%N", -- no comment
"hook827","", -- before comment
"hook828"," -- ", -- comment begin line
"hook829","%N", -- comment end of line
"hook830","", -- after comment
"hook831","");
short_print.hook_or("hook833","");
end;
short_print.hook_or("hook834","");
ensure
fmt.indent_level = old fmt.indent_level;
end;
feature {NONE}
check_assertion_mode: STRING is
do
Result := "inv";
end;
feature {RUN_CLASS}
c_define is
-- Define C function to check invariant.
require
run_control.invariant_check;
current_type /= Void;
run_class.at_run_time;
small_eiffel.is_ready;
cpp.on_c
local
id: INTEGER;
do
id := current_type.id;
-- The invariant frame descriptor :
c_code.copy("se_frame_descriptor se_ifd");
id.append_in(c_code);
cpp.put_extern7(c_code);
c_code.copy("{%"Class invariant of ");
c_code.append(current_type.run_time_mark);
c_code.append("%",1,0,%"");
c_frame_descriptor_format.clear;
current_type.c_frame_descriptor;
c_code.append(c_frame_descriptor_format);
c_code.append("%",1};%N");
cpp.put_string(c_code);
-- The function :
c_code.clear;
c_code.extend('T');
id.append_in(c_code);
c_code.extend('*');
c_code.append(fz_se_i);
id.append_in(c_code);
c_code.append("(se_dump_stack*caller,T");
id.append_in(c_code);
c_code.append("*C)");
cpp.put_c_heading(c_code);
cpp.swap_on_c;
c_code.copy("se_dump_stack ds;%Nds.fd=&se_ifd");
id.append_in(c_code);
c_code.append(";%Nds.current=((void**)&C);%N");
cpp.put_string(c_code);
cpp.put_position_in_ds(start_position);
cpp.put_string(
"ds.caller=caller;%N%
%se_dst=&ds;%N");
compile_to_c;
cpp.put_string("se_dst=caller;%Nreturn C;%N}%N");
ensure
cpp.on_c
end;
feature {NONE}
c_code: STRING is
once
!!Result.make(128);
end;
end -- CLASS_INVARIANT