[dtrace-discuss] dtrace keywords in postfix expressions

[Bryan Cantrill]

Nothing like cracking open dt_grammar.y to get the blood flowing! ;)  I
don't think the change looks unreasonable; how does the test suite fare?
If this is no way breaks extant D programs, I'm all for it...

        - Bryan


On Fri, Oct 3, 2014 at 9:13 PM, Mark Johnston via dtrace-discuss <
dtrace-discuss at lists.dtrace.org> wrote:

> Hello,
>
> DTrace has a few keywords which are not keywords in C/C++ (e.g.
> "provider"). One annoyance which has come up a few times is the fact
> that such keywords cannot be used in expressions which would be valid in
> the code being traced. For example, FreeBSD's struct g_consumer contains
> a field called "provider", and attempting to run the following snippet of
> D results in a syntax error:
>
> fbt::g_vfs_done:entry {printf("%s",
> stringof(args[0]->bio_from->provider->name));}
>
> I don't see any reason the D grammar can't support this, however. The
> patch at [1] attempts to fix this problem by allowing certain keywords
> to appear in the place of identifiers in postfix expressions. It's not a
> complete solution since it doesn't handle types or probe names, but it's a
> start. Any thoughts on this approach?
>
> Thanks!
> -Mark
>
> [1] http://people.freebsd.org/~markj/patches/dtrace_keywords.diff
>
>
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