[all-commits] [llvm/llvm-project] 6d34cf: [Sema] Diagnose tautological bounds checks (#120222)
Nikita Popov via All-commits
all-commits at lists.llvm.org
Tue Dec 17 19:39:34 PST 2024
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 6d34cfac53b993a6cdf3d6669e017eac3a2296c8
https://github.com/llvm/llvm-project/commit/6d34cfac53b993a6cdf3d6669e017eac3a2296c8
Author: Nikita Popov <npopov at redhat.com>
Date: 2024-12-18 (Wed, 18 Dec 2024)
Changed paths:
M clang/docs/ReleaseNotes.rst
M clang/include/clang/Basic/DiagnosticSemaKinds.td
M clang/lib/Sema/SemaExpr.cpp
A clang/test/Sema/tautological-pointer-comparison.c
Log Message:
-----------
[Sema] Diagnose tautological bounds checks (#120222)
This diagnoses comparisons like `ptr + unsigned_index < ptr` and `ptr +
unsigned_index >= ptr`, which are always false/true because addition of
a pointer and an unsigned index cannot wrap (or the behavior is
undefined).
This warning is intended to help find broken bounds checks (which must
be implemented in terms of uintptr_t instead).
Fixes https://github.com/llvm/llvm-project/issues/120214.
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