verilator/test_regress/t/t_trace_empty.pl
Geza Lore ff425369ac
Reduce .rodata footprint of trace initialization (#3250)
Trace initialization (tracep->decl* functions) used to explicitly pass
the complete hierarchical names of signals as string constants. This
contains a lot of redundancy (path prefixes), does not scale well with
large designs and resulted in .rodata sections (the string constants) in
ELF executables being extremely large.

This patch changes the API of trace initialization that allows pushing
and popping name prefixes as we walk the hierarchy tree, which are
prepended to declared signal names at run-time during trace
initialization. This in turn allows us to emit repeat path/name
components only once, effectively removing all duplicate path prefixes.
On SweRV EH1 this reduces the .rodata section in a --trace build by 94%.

Additionally, trace declarations are now emitted in lexical order by
hierarchical signal names, and the top level trace initialization
function respects --output-split-ctrace.
2021-12-19 15:15:07 +00:00

27 lines
758 B
Perl
Executable File

#!/usr/bin/env perl
if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
# DESCRIPTION: Verilator: Verilog Test driver/expect definition
#
# Copyright 2021 by Wilson Snyder. This program is free software; you
# can redistribute it and/or modify it under the terms of either the GNU
# Lesser General Public License Version 3 or the Perl Artistic License
# Version 2.0.
# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
scenarios(simulator => 1);
compile(
verilator_flags2 => ['--trace'],
);
execute(
check_finished => 1,
);
file_grep_not("$Self->{obj_dir}/simx.vcd", qr/scope/);
file_grep_not("$Self->{obj_dir}/simx.vcd", qr/upscope/);
file_grep_not("$Self->{obj_dir}/simx.vcd", qr/var/);
ok(1);
1;