Your message dated Tue, 09 Feb 2016 11:29:18 +0000
with message-id <[email protected]>
and subject line Bug#814147: Removed package(s) from unstable
has caused the Debian Bug report #574597,
regarding [ghdl] Uninitialized generics can make ghdl trying to eat a huge
amount of memory during simulation, making then the whole system hang
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
574597: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=574597
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: ghdl
Version: 0.29+gcc4.3.4+dfsg-1
Severity: serious
--- Please enter the report below this line. ---
Hi
I noticed that ghdl check for uninitialized generics that are defined
in the top level only.
In this example there is an uninitialized generic which is defined in
the top level :
jonas@PC:~/a$ ghdl -a good.vhd
jonas@PC:~/a$ ghdl -e tb
error: entity "tb" cannot be at the top of a design
good.vhd:16:13: (generic "n_bits_data" has no default value)
/usr/lib/ghdl/bin/ghdl: compilation error
jonas@PC:~/a$
Then ghdl rightly complains during the elaboration.
But when there is a generic that isn't defined in the top level, ghdl
won't check if it is initialized or not.
See the following example :
jonas@PC:~/a$ ghdl -a bad.vhd
jonas@PC:~/a$ ghdl -e tb
Here ghdl should complain that there is an uninitialized generic, but
it doesn't because the generic is not defined in the top level.
jonas@PC:~/a$ ghdl -r tb
Now ghdl is trying to eat a huge amount of memory and I quickly have to
kill it before the whole system hangs !!!!
There is more explanations in the examples (put in attachement)
Bye
Jonas
--- System information. ---
Architecture: i386
Kernel: Linux 2.6.32-3-686
Debian Release: squeeze/sid
500 testing ftp.de.debian.org
111 unstable ftp.de.debian.org
110 experimental ftp.de.debian.org
--- Package information. ---
Depends (Version) | Installed
=============================-+-=============
libc6 (>= 2.7) | 2.10.2-6
libgcc1 (>= 1:4.1.1) | 1:4.4.2-9
libgmp3c2 | 2:4.3.2+dfsg-1
libgnat-4.4 (>= 4.4.3-1) | 4.4.3-1
libmpfr1ldbl | 2.4.2-3
gnat-4.4 | 4.4.3-1
zlib1g-dev | 1:1.2.3.4.dfsg-3
Recommends (Version) | Installed
=========================-+-===========
gtkwave | 3.3.3-1
Package's Suggests field is empty.
--
<[email protected]>
library ieee;
use ieee.std_logic_1164.all;
-- COMPONENT
entity a is
generic (N_BITS_DATA : integer);
end entity;
architecture arch_a of a is
begin
end;
--
-- TESTBENCH
entity tb is
generic (N_BITS_DATA : integer);
end;
architecture arch_tb of tb is
begin
end;
--
library ieee;
use ieee.std_logic_1164.all;
-- COMPONENT
entity a is
-- N_BITS_DATA is nowhere initialized. This problem should be catched during
-- elaboration but it isn't !
-- During simulation I found that the value of N_BITS_DATA is -2147483648 and
-- that the value of N_BITS_DATA-1 is 2147483647 !!!!
generic (N_BITS_DATA : integer);
end entity;
architecture arch_a of a is
--~ -- Here data_s will have 4_194_305 elements and this will make ghdl
--~ -- take about 650 MB of memory. According to that, each element take about 150 B
--~ signal data_s : std_logic_vector((N_BITS_DATA-1)/512 downto 0);
-- This line make ghdl eat all the free memory because it is trying to make a
-- vector of 2**31 elements !!!! And there isn't enough memory because we need
-- about 2**31 * 150 B = ~ 300 GB !!!!
signal data_s : std_logic_vector(N_BITS_DATA-1 downto 0);
--~ -- Strangely this line doesn't make the simulation failed because N_BITS_DATA
--~ -- is negativ, but it doesn't increase the use of memory either.
--~ signal data_s : std_logic_vector(N_BITS_DATA downto 0);
begin
process begin
-- N_BITS_DATA = -2147483648 = -2**31
report integer'image(N_BITS_DATA);
--
-- N_BITS_DATA-1 = 2147483647 = 2**31 - 1
report integer'image(N_BITS_DATA-1);
--
-- (N_BITS_DATA-1)/512 = 4_194_304 = 2**22
report integer'image((N_BITS_DATA-1)/512);
--
end process;
end;
--
-- TESTBENCH
entity tb is end entity;
architecture arch_tb of tb is
begin
X1: entity work.a;
end;
--
--- End Message ---
--- Begin Message ---
Version: 0.29+gcc4.3.4+dfsg-1.1+rm
Dear submitter,
as the package ghdl has just been removed from the Debian archive
unstable we hereby close the associated bug reports. We are sorry
that we couldn't deal with your issue properly.
For details on the removal, please see https://bugs.debian.org/814147
The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.
This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
[email protected].
Debian distribution maintenance software
pp.
Scott Kitterman (the ftpmaster behind the curtain)
--- End Message ---
