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The plpgsql scanner is a wrapper around the core scanner, which already uses the flex %option reentrant. This patch only pushes up a few levels the place where the scanner handle is allocated. Before, it was allocated in pl_scanner.c in a global variable, so to the outside the scanner was not reentrant. Now, it is allocated in pl_comp.c and is passed as an argument to yyparse(), similar to how it is handled in other reentrant scanners. Also use flex yyextra to handle context information, instead of global variables. Again, this uses the existing yyextra support in the core scanner. This complements the other changes to make the scanner reentrant. The bison option %pure-parser is used to make the generated parser pure. This happens in the usual way, since plpgsql has its own bison parser definition. Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Discussion: https://www.postgresql.org/message-id/flat/eb6faeac-2a8a-4b69-9189-c33c520e5b7b@eisentraut.org
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.