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library ieee;
use ieee.std_logic_1164.std_logic;
use ieee.std_logic_1164.to_x01;
use ieee.std_logic_1164.is_x;
package std_logic_warning is
function "="(l, r : std_logic) return boolean;
end package;
package body std_logic_warning is
use ieee.std_logic_1164."=";
function "="(l, r : std_logic) return boolean is
begin
if is_x(l) or is_x(r) then
report "std_logic_warning.""="": metavalue detected, returning FALSE"
severity WARNING;
return FALSE;
end if;
return l = r; -- std_logic_1164."="(l, r);
end function;
end package body;
library ieee;
use ieee.std_logic_1164.std_ulogic;
use ieee.std_logic_1164.std_logic;
-- use ieee.std_logic_1164.all;
use work.std_logic_warning.all;
entity warning_test is
end entity;
architecture foo of warning_test is
signal a: std_logic;
signal b: std_logic;
begin
UNLABELLED:
process
begin
wait for 1 ns;
a <= ieee.std_logic_1164.'X';
wait for 1 ns;
b <= ieee.std_logic_1164.'1';
wait for 1 ns;
a <= ieee.std_logic_1164.'0';
wait for 1 ns;
b <= ieee.std_logic_1164.'0';
wait;
end process;
MONITOR:
process (a,b)
begin
assert a = b
report "a = b " & "( " & std_logic'image(a)
& "=" & std_logic'image(b) & " )"
severity NOTE;
end process;
end architecture;
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