Remove the need for backslashes in syscalls.master.

[brooks]

Summary

Join non-special lines together until we hit a line containing a '}'
character. This allows the function declaration body to be split
across multiple lines without backslash continuation characters.

Continue to join lines ending with backslashes to allow gradual
migration and to support out-of-tree syscall vectors.

Test Plan

verified no changes in generated files

[emaste]

sys/kern/makesyscalls.sh

81

we join with a space now?

[kib]

Might be it is a good idea to check that there is no nesting '(' or unbalanced ')' ?

[brooks]

• Join without spaceso (previous behavior).

[emaste]

In D17488#373456, @brooks wrote:

• Join without spaceso (previous behavior).

I didn't have a strong opinion on this either way, just wanted to make sure it was an intentional change.

[brooks]

In D17488#373351, @kib wrote:

Might be it is a good idea to check that there is no nesting '(' or unbalanced ')' ?

The awk line parser makes sure things are of the form:

{<return_type> <function>(<arg_list>);}

I suppose one could check that <arg_list> contains balanced parentheses, but that seems beyond the scope of this change.

[brooks]

In D17488#373462, @emaste wrote:

In D17488#373456, @brooks wrote:

• Join without spaceso (previous behavior).

I didn't have a strong opinion on this either way, just wanted to make sure it was an intentional change.

I didn't have a strong opinion and when I tried writing down my motivation for the change it sounded weak...

[brooks]

• Allow both types of joins to be mixed. This makes it easier to semi-programatically convert files where alternative names are wrapped with backslashes.