[clang] [analyzer][docs] Update the release notes for llvm-18 (PR #76446)

Balazs Benics via cfe-commits cfe-commits at lists.llvm.org
Wed Dec 27 07:42:21 PST 2023 

https://github.com/steakhal created https://github.com/llvm/llvm-project/pull/76446

This PR prepares the release notes of the Clang Static Analyzer for the llvm-18 release branch, due in about a week.
See the regular [release schedule](https://llvm.org/docs/HowToReleaseLLVM.html#annual-release-schedule).

This patch was written after examining the relevant Static Analyzer commits since the last release.
Have a look at the commits, and provide feedback if I missed anything interesting.
Note that the release notes is not meant to be an exhaustive list of the changes, but rather a curated list of the relevant changes that might interest our stakeholders, such as tool vendors based on top of CSA or users with custom checkers.

See the relevant commits by using this command:
```
git log --oneline llvmorg-18-init..llvm/main   clang/{lib/StaticAnalyzer,include/clang/StaticAnalyzer} | grep -v NFC | grep -v -i revert
```

Tasks to do before llvm-18 branches off:

We need to adjust/add documentation after the following PRs, to the `clang/docs/analyzer/checkers.rst`:

 - [ ] #73247: The list in the docs is incomplete. We need to check and update it.
 - [ ] #66481: The `StdVariant` alpha checker experimental, but we should still have some documentation for it. Now its completely absent.

>From a4a8704644067a7cf81bee601e4898bbc6b9d289 Mon Sep 17 00:00:00 2001
From: Balazs Benics <benicsbalazs at gmail.com>
Date: Wed, 27 Dec 2023 14:13:08 +0100
Subject: [PATCH] [analyzer][docs] Update the release notes for llvm-18

---
 clang/docs/ReleaseNotes.rst | 108 +++++++++++++++++++++++++++++++++---
 1 file changed, 101 insertions(+), 7 deletions(-)

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index ee211c16a48ac8..17b6e285a89ca2 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -1052,18 +1052,92 @@ libclang
 Static Analyzer
 ---------------
 
+- Implemented the ``[[clang::suppress]]`` attribute for suppressing diagnostics
+  of static analysis tools, such as the Clang Static Analyzer.
+  `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#security-cert-env-invalidptr>`__.
+
+- Added a new experimental checker ``alpha.core.StdVariant`` to detect variant
+  accesses via wrong alternatives.
+  (`#66481 <https://github.com/llvm/llvm-project/pull/66481>`_)
+
+- Added a new experimental checker ``alpha.cplusplus.ArrayDelete`` to detect
+  destructions of arrays of polymorphic objects that are destructed as their
+  base class (`CERT EXP51-CPP <https://wiki.sei.cmu.edu/confluence/display/cplusplus/EXP51-CPP.+Do+not+delete+an+array+through+a+pointer+of+the+incorrect+type>`_).
+  `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#alpha-cplusplus-arraydelete-c>`__.
+  (`0e246bb67573 <https://github.com/llvm/llvm-project/commit/0e246bb67573799409d0085b89902a330998ddcc>`_)
+
 - Added a new checker ``core.BitwiseShift`` which reports situations where
   bitwise shift operators produce undefined behavior (because some operand is
   negative or too large).
+  `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#core-bitwiseshift-c-c>`__.
+
+- Support "Deducing this" (P0847R7). (Worked out of the box)
+  (`af4751738db8 <https://github.com/llvm/llvm-project/commit/af4751738db89a142a8880c782d12d4201b222a8>`__)
 
 - Move checker ``alpha.unix.Errno`` out of the ``alpha`` package
   to ``unix.Errno``.
+  `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#unix-errno-c>`__.
 
 - Move checker ``alpha.unix.StdCLibraryFunctions`` out of the ``alpha`` package
   to ``unix.StdCLibraryFunctions``.
 
+- Added a new checker configuration option to
+  ``alpha.security.cert.InvalidPtrChecker``.
+  `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#security-cert-env-invalidptr>`__.
+  (`#67663 <https://github.com/llvm/llvm-project/pull/67663>`_)
+
+- Move checker ``alpha.security.cert.env.InvalidPtr`` out of the ``alpha``
+  package to ``security.cert.env.InvalidPtr``.
+  `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#security-cert-env-invalidptr>`__.
+
+- Move checker ``alpha.cplusplus.EnumCastOutOfRange`` out of the ``alpha``
+  package to ``optin.core.EnumCastOutOfRange``.
+  `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#optin-core-enumcastoutofrange-c-c>`__.
+
+- Improved the diagnostics of the ``optin.core.EnumCastOutOfRange`` checker.
+  It will display the name and the declaration of the enumeration along with
+  the concrete value being cast to the enum.
+  (`#74503 <https://github.com/llvm/llvm-project/pull/74503>`_)
+
+- Improved the ``ArrayBoundV2`` checker for detecting buffer accesses prior
+  the buffer; and also reworked the diagnostic messages.
+  (`3e014038b373 <https://github.com/llvm/llvm-project/commit/3e014038b373e5a4a96d89d46cea17e4d2456a04>`_,
+  `#70056 <https://github.com/llvm/llvm-project/pull/70056>`_,
+  `#72107 <https://github.com/llvm/llvm-project/pull/72107>`_)
+
+- Improved the ``CStringChecker`` checking both ends of the buffers in more cases.
+  (`c3a87ddad62a <https://github.com/llvm/llvm-project/commit/c3a87ddad62a6cc01acaccc76592bc6730c8ac3c>`_,
+  `0954dc3fb921 <https://github.com/llvm/llvm-project/commit/0954dc3fb9214b994623f5306473de075f8e3593>`_)
+
+- Improved the ``StreamChecker`` by modeling more functions like,
+  ``fflush``, ``fputs``, ``fgetc``, ``fputc``, ``fopen``, ``fopen``, ``fgets``.
+  (`#74296 <https://github.com/llvm/llvm-project/pull/74296>`_,
+  `#73335 <https://github.com/llvm/llvm-project/pull/73335>`_,
+  `#72627 <https://github.com/llvm/llvm-project/pull/72627>`_,
+  `#71518 <https://github.com/llvm/llvm-project/pull/71518>`_,
+  `#72016 <https://github.com/llvm/llvm-project/pull/72016>`_,
+  `#70540 <https://github.com/llvm/llvm-project/pull/70540>`_,
+  `#73638 <https://github.com/llvm/llvm-project/pull/73638>`_)
+
+- Improved the ``unix.StdCLibraryFunctions`` checker by modeling more functions like ``send``, ``recv``, ``readlink`` and ``errno`` behavior.
+  (`52ac71f92d38 <https://github.com/llvm/llvm-project/commit/52ac71f92d38f75df5cb88e9c090ac5fd5a71548>`_,
+  `#71373 <https://github.com/llvm/llvm-project/pull/71373>`_,
+  `#71392 <https://github.com/llvm/llvm-project/pull/71392>`_)
+
+- Fixed a false negative for when accessing a nonnull property (ObjC).
+  (`1dceba3a3684 <https://github.com/llvm/llvm-project/commit/1dceba3a3684d12394731e09a6cf3efcebf07a3a>`_)
+
+- ``DeprecatedOrUnsafeBufferHandling`` now considers ``fprintf`` calls unsafe.
+  `Documentation <https://clang.llvm.org/docs/analyzer/checkers.html#security-insecureapi-deprecatedorunsafebufferhandling-c>`__.
+
 - Fix false positive in mutation check when using pointer to member function.
-  (`#66204: <https://github.com/llvm/llvm-project/issues/66204>`_).
+  (`#66204 <https://github.com/llvm/llvm-project/issues/66204>`_)
+
+- Fixed a crash caused by ``builtin_bit_cast``.
+  (`#69922 <https://github.com/llvm/llvm-project/issues/69922>`_)
+
+- Fix ``StackAddrEscapeChecker`` crash on temporary object fields.
+  (`#66221 <https://github.com/llvm/llvm-project/issues/66221>`_)
 
 - The ``alpha.security.taint.TaintPropagation`` checker no longer propagates
   taint on ``strlen`` and ``strnlen`` calls, unless these are marked
@@ -1072,16 +1146,36 @@ Static Analyzer
   Read the PR for the details.
   (`#66086 <https://github.com/llvm/llvm-project/pull/66086>`_)
 
+- Other taint-related improvements.
+  (`#66358 <https://github.com/llvm/llvm-project/pull/66358>`_,
+  `#66074 <https://github.com/llvm/llvm-project/pull/66074>`_,
+  `#66358 <https://github.com/llvm/llvm-project/pull/66358>`_)
+
 - A few crashes have been found and fixed using randomized testing related
-  to the use of ``_BitInt()`` in tidy checks and in clang analysis. See
-  `#67212 <https://github.com/llvm/llvm-project/pull/67212>`_,
+  to the use of ``_BitInt()`` in tidy checks and in clang analysis.
+  (`#67212 <https://github.com/llvm/llvm-project/pull/67212>`_,
   `#66782 <https://github.com/llvm/llvm-project/pull/66782>`_,
   `#65889 <https://github.com/llvm/llvm-project/pull/65889>`_,
-  `#65888 <https://github.com/llvm/llvm-project/pull/65888>`_, and
-  `#65887 <https://github.com/llvm/llvm-project/pull/65887>`_
+  `#65888 <https://github.com/llvm/llvm-project/pull/65888>`_,
+  `#65887 <https://github.com/llvm/llvm-project/pull/65887>`_)
 
-- Move checker ``alpha.cplusplus.EnumCastOutOfRange`` out of the ``alpha``
-  package to ``optin.core.EnumCastOutOfRange``.
+- Fixed note links of the HTML output.
+  (`#64054 <https://github.com/llvm/llvm-project/issues/64054>`_)
+
+- Allow widening rage-based for loops.
+  (`#70190 <https://github.com/llvm/llvm-project/pull/70190>`_)
+
+- Fixed uninitialized base class with initializer list when ctor is not
+  declared in the base class.
+  (`#70464 <https://github.com/llvm/llvm-project/issues/70464>`_,
+  `#59493 <https://github.com/llvm/llvm-project/issues/59493>`_,
+  `#54533 <https://github.com/llvm/llvm-project/issues/54533>`_)
+
+- Added support for the ``cleanup`` attribute.
+  `Documentation <https://clang.llvm.org/docs/AttributeReference.html#cleanup>`__.
+
+- Checkers can query constraint bounds to improve diagnostic messages.
+  (`#74141 <https://github.com/llvm/llvm-project/pull/74141>`_)
 
 .. _release-notes-sanitizers:

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