Horton

Re: making the backend's json parser work in frontend code

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Mahendra Singh Thalor <mahi6run@gmail.com>
Cc: Mark Dilger <mark.dilger@enterprisedb.com>, Andrew Dunstan <andrew.dunstan@2ndquadrant.com>, David Steele <david@pgmasters.net>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2020-01-28T15:06:23Z
Lists: pgsql-hackers 
On Mon, Jan 27, 2020 at 2:02 PM Mahendra Singh Thalor
<mahi6run@gmail.com> wrote:
> I can see one warning on HEAD.
>
> jsonapi.c: In function ‘json_errdetail’:
> jsonapi.c:1068:1: warning: control reaches end of non-void function
> [-Wreturn-type]
>  }
>  ^
>
> Attaching a patch to fix warning.

Hmm, I don't get a warning there. This function is a switch over an
enum type with a case for every value of the enum, and every branch
either does a "return" or an "elog," so any code after the switch
should be unreachable. It's possible your compiler is too dumb to know
that, but I thought there were other places in the code base where we
assumed that if we handled every defined value of enum, that was good
enough.

But maybe not. I found similar coding in CreateDestReceiver(), and
that ends with:

        /* should never get here */
        pg_unreachable();

So perhaps we need the same thing here. Does adding that fix it for you?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

Commits

  1. Add jsonapi.c to Mkvcbuild.pm's @pgcommonallfiles.

  2. Move jsonapi.c and jsonapi.h to src/common.

  3. Move some code from jsonapi.c to jsonfuncs.c.

  4. Adjust pg_parse_json() so that it does not directly ereport().

  5. Remove jsonapi.c's lex_accept().

  6. Split JSON lexer/parser from 'json' data type support.

  7. Rationalize code placement between wchar.c, encnames.c, and mbutils.c.

  8. Move wchar.c and encnames.c to src/common/.

  9. Update header comments for wchar.c and encnames.c.

  10. Make StringInfo available to frontend code.

  11. Use SASLprep to normalize passwords for SCRAM authentication.