This reverts commit 22df4549a3718dcd8b387ba8246978349e4be50c.
After a quick investigation, realizing that the Sanitizer test
failures caused by this patch is not likely to block other
contributors. I re-land this patch before taking a closer look at
those tests so that it won't block the [-Wunsafe-buffer-usage]
development.
This reverts commit ef47a0a711f12add401394f7af07a0b4d1635b56.
Revert "[-Wunsafe-buffer-usage] Add a new `forEachDescendant` matcher that skips callable declarations"
This reverts commit b2ac5fd724c44cf662caed84bd8f84af574b981d.
This patch is causing failure in some Sanitizer tests
(https://lab.llvm.org/buildbot/#/builders/5/builds/30522/steps/13/logs/stdio). Reverting the patch and its' fix.
This reverts commit f58b025354ee2d3bcd7ab2399a11429ec940c1e0.
The previous revert reverts a patch that causes compilation problem on
windows which can be reproduced using `-fdelayed-template-parsing`.
I'm now to revert the patch back and commit a fix next.
For -Wunsafe-buffer-usage diagnostics, we want to warn about pointer
arithmetics since resulting pointers can be used to access buffers.
Therefore, I add an `UnsafeGadget` representing general pointer
arithmetic operations.
Reviewed by: NoQ
Differential revision: https://reviews.llvm.org/D139233
Note this is a change local to -Wunsafe-buffer-usage checks.
Add a new matcher `forEveryDescendant` that recursively matches
descendants of a `Stmt` but skips nested callable definitions. This
matcher has same effect as using `forEachDescendant` and skipping
`forCallable` explicitly but does not require the AST construction to be
complete.
Reviewed by: NoQ, xazax.hun
Differential revision: https://reviews.llvm.org/D138329
Unsafe Buffer Usage analysis only warns unsafe buffer accesses but not
pointer dereferences. An array subscript on a literal zero is
equivalent to dereference a pointer thus we do not want to warn it.
Reviewed By: NoQ
Differential Revision: https://reviews.llvm.org/D138321
Generalize the pointer expression AST matcher in Unsafe Buffer Usage analysis.
Add test cases for various kinds of pointer usages.
Reviewed By: NoQ, aaron.ballman, xazax.hun
Differential Revision: https://reviews.llvm.org/D138318
This is the initial commit for -Wunsafe-buffer-usage, a warning that helps
codebases (especially modern C++ codebases) transition away from raw buffer
pointers.
The warning is implemented in libAnalysis as it's going to become a non-trivial
analysis, mostly the fixit part where we try to figure out if we understand
a variable's use pattern well enough to suggest a safe container/view
as a replacement. Some parts of this analsysis may eventually prove useful
for any similar fixit machine that tries to change types of variables.
The warning is disabled by default.
RFC/discussion in https://discourse.llvm.org/t/rfc-c-buffer-hardening/65734
Differential Revision: https://reviews.llvm.org/D137346
