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Prior to this commit, the linitial(), lsecond(), lthird(), lfourth() macros and their int and Oid list cousins would call their corresponding inlined function to fetch the cell of interest. Those inline functions were kind enough to return NULL if the particular cell did not exist. Unfortunately, the care that these functions took was of no relevance to the calling macros as they proceeded to directly dereference the returned value without any regard to whether that value was NULL or not. If it had been, we'd have segfaulted. Of course, the fact that we would have segfaulted on misuse of these macros just goes to prove that nobody is relying on the empty or list too small checks. So here we just get rid of those checks completely. The existing inline functions have been left alone as someone may be using those directly. We just replace the call within each macro to use list_nth_cell(). For the llast*() case we require a new list_last_cell() inline function to get away from the multiple evaluation hazard that we'd get if we fetched ->length on the macro's parameter. Author: David Rowley Reviewed-by: Tom Lane Discussion: https://postgr.es/m/CAApHDvpo1zj9KhEpU2cCRZfSM3Q6XGdhzuAS2v79PH7WJBkYVA@mail.gmail.com |
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| README.git | ||
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.