[Pspp-commits] [SCM] GNU PSPP branch, master, updated. v1.5.4-12-g435b06ea1

[Ben Pfaff]

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- Log -----------------------------------------------------------------
commit 435b06ea1e6cefd2d540552e161a84a9b2cbef42
Author: Ben Pfaff <blp@cs.stanford.edu>
Date:   Sun Apr 10 08:47:00 2022 -0700

    expressions: Convert SYSMIS into int as INT_MIN during optimization too.
    
    In an expression like LPAD('abc', $sysmis), the LPAD function is evaluated
    using a C function that takes an 'int' as its second argument.  During
    expression evaluation, out-of-range values get converted into SYSMIS by
    the NUM_TO_INTEGER operator that gets automatically inserted to ensure
    that, and then SYSMIS gets converted into INT_MIN to pass to the C
    function.  This worked OK for runtime evaluation, but the optimizer failed
    to do the conversion of SYSMIS to INT_MIN, which yielded undefined
    behavior.  Some platforms (e.g. GCC on x86) converted SYSMIS (which is
    the second-smallest 'double' value) into INT_MIN, so no problem showed up
    there, but other platforms yielded INT_MAX, causing unexpected failures.
    
    This commit fixes the problem by explicitly converting SYSMIS into INT_MIN
    during optimization.
    
    Thanks to Friedrich Beckmann for reporting and uncovering the problem.
    Bug #62267.

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

Summary of changes:
 src/language/expressions/generate.py | 3 ++-
 src/language/expressions/optimize.c  | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)


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