[P4-dev] P4-dev Digest, Vol 15, Issue 4

Pavel Chuprikov pschuprikov at gmail.com
Wed Nov 2 12:28:57 EDT 2016


The PP directives are lost on a very early stage
<https://github.com/p4lang/p4-hlir/blob/master/p4_hlir/frontend/preprocessor.py#L48>
when the input is fed to *gcc*.

If those directives are actually used in p4 code, I can suggest to query
the p4 object that depends on those directives, e.g., whether some
conditionally compiled action is present or, if you have something
like *field_name
: SOME_MACRO*, what is the width of the field.

Regards,
Pavel


ср, 2 нояб. 2016 г. в 17:05, Jahandad Khan <jehandad at vt.edu>:

Hi,

Following up on Hemant's question, alternatively if there is a #pragma
used, can it be queried in the HLIR. Currently, there is not support for
such a feature in HLIR document.

Regards,
Jehandad

On Wed, Nov 2, 2016 at 12:00 PM <p4-dev-request at lists.p4.org> wrote:

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Today's Topics:

   1. preprocessor support in HLIR? (hemant at mnkcg.com)


----------------------------------------------------------------------

Message: 1
Date: Wed, 2 Nov 2016 10:59:34 -0400
From: <hemant at mnkcg.com>
To: <p4-dev at lists.p4.org>
Subject: [P4-dev] preprocessor support in HLIR?
Message-ID: <002b01d23519$b99d6440$2cd82cc0$@mnkcg.com>
Content-Type: text/plain; charset="utf-8"

If one adds a C  ?#define VAR_FOO 1? in P4 code, does HLIR generate an IR
for it?  One needs the defines in the back-end compiler.



Thanks,



Hemant

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