Issue with 'last_event / 'delayed attributes on nested records #1164
Description
Hi,
I have problems when elaboration designs using attributes like 'last_event or 'delayed on nested records. The code works with GHDL 4.1.0.
Following code snippet repoduces the problem:
library ieee;
use ieee.std_logic_1164.all;
entity tb_issue is
end entity;
architecture arch of tb_issue is
type rec_part is record
a : std_logic;
end record;
type t_rec is record
rec_part_a : rec_part;
b : std_logic;
end record t_rec;
signal rec_sig : t_rec;
begin
detect : process (all)
variable var_time : time;
begin
-- var_time := rec_sig.b'last_event; -- okay
var_time := rec_sig.rec_part_a'last_event; -- not okay
-- var_time := rec_sig.rec_part_a'delayed(0 ns)'last_event; -- not okay
end process;
end architecture arch;
Output of analysis+elaboration (nvc --std=08 -a nvc_test.vhd -e tb_issue)
Name WORK.TB_ISSUE.DETECT
Kind process
Context WORK.TB_ISSUE
Blocks 2
Registers 6
Types 5
Variables 1
VAR_TIME // -2^63..2^63-1
Begin
0: r0 := const -9223372036854775808 // -2^63..2^63-1 => -2^63
VAR_TIME := store r0
return
1: r1 := var upref 1, REC_SIG // @<WORK.TB_ISSUE-ARCH.T_REC${}>
r2 := record ref r1 field 1 // @<$<0..8>> => $<0..8>
r3 := load indirect r2 // $<0..8>
r4 := last event r3 // -2^63..2^63-1
VAR_TIME := store r4
r5 := record ref r1 field 0 // @<WORK.TB_ISSUE-ARCH.REC_PART${}> => WORK.TB_ISSUE-ARCH.REC_PART${}
invalid := last event r5 <----
** Fatal: signal argument to last event must have signal type
[0x5653f29c7fe6]
[0x5653f28e2173]
[0x5653f2992c38]
[0x5653f2994fe3]
[0x5653f29b2137]
[0x5653f2996f8c]
[0x5653f299857d]
[0x5653f296ac35]
[0x5653f2963f97]
[0x5653f2a4fce6]
[0x5653f2902a73]
[0x5653f28ffe7f]
[0x5653f290157f]
[0x5653f28fa31c]
[0x7fc5287e8d8f] (/usr/lib/x86_64-linux-gnu/libc.so.6)
[0x7fc5287e8e3f] (/usr/lib/x86_64-linux-gnu/libc.so.6) __libc_start_main
[0x5653f28fb794]
nvc 1.15.1 (db31b1a) (Using LLVM 14.0.0) [x86_64-pc-linux-gnu]
Please report this bug at https://github.com/nickg/nvc/issues