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Filter: Improve handling of stack frames in filter bytecode

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When f_line is done, we have to pop the stack frame. The old code just
removed nominal number of args/vars. Change it to use stored ventry value
modified by number of returned values. This allows to allocate variables
on a stack frame during execution of f_lines instead of just at start.

But we need to know the number of returned values for a f_line. It is 1
for term, 0 for cmd. Store that to f_line during linearization.
This commit is contained in:
Ondrej Zajicek (work)
2022-03-09 02:32:29 +01:00
committed by Ondrej Zajicek
parent f31f4e6eef
commit a2527ee53d
9 changed files with 26 additions and 24 deletions
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proto/static/config.Y
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@@ -40,7 +40,7 @@ static_route_finish(void)
if (net_type_match(this_srt->net, NB_DEST) == !this_srt->dest)
cf_error("Unexpected or missing nexthop/type");
this_srt->cmds = f_linearize(this_srt_cmds);
this_srt->cmds = f_linearize(this_srt_cmds, 0);
}
CF_DECLS