[PATCH] D60281: [analyzer] Add docs for cplusplus.InnerPointer

Kristóf Umann via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Wed Aug 14 17:07:01 PDT 2019


Szelethus updated this revision to Diff 215288.
Szelethus marked 2 inline comments as done.
Szelethus added a comment.

Fixed!


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D60281/new/

https://reviews.llvm.org/D60281

Files:
  clang/docs/analyzer/checkers.rst


Index: clang/docs/analyzer/checkers.rst
===================================================================
--- clang/docs/analyzer/checkers.rst
+++ clang/docs/analyzer/checkers.rst
@@ -242,10 +242,37 @@
 
 .. _cplusplus-InnerPointer:
 
-cplusplus.InnerPointer
-""""""""""""""""""""""
+cplusplus.InnerPointer (C++)
+""""""""""""""""""""""""""""
 Check for inner pointers of C++ containers used after re/deallocation.
 
+Many container methods in the C++ standard library are known to invalidate
+"references" (including actual references, iterators and raw pointers) to
+elements of the container. Using such references after they are invalidated
+causes undefined behavior, which is a common source of memory errors in C++ that
+this checker is capable of finding.
+
+The checker is currently limited to ``std::string`` objects and doesn't
+recognize some of the more sophisticated approaches to passing unowned pointers
+around, such as ``std::string_view``.
+
+.. code-block:: cpp
+
+ void consume(const char *);
+
+ void deref_after_assignment() {
+   std::string s = "llvm";
+   const char *c = s.data(); // note: pointer to inner buffer of 'std::string' obtained here
+   s = "clang"; // note: inner buffer of 'std::string' reallocated by call to 'operator='
+   consume(c); // warn: inner pointer of container used after re/deallocation
+ }
+
+ const char *return_temp(int x) {
+   return std::to_string(x).c_str(); // warn: inner pointer of container used after re/deallocation
+   // note: pointer to inner buffer of 'std::string' obtained here
+   // note: inner buffer of 'std::string' deallocated by call to destructor
+ }
+
 .. _cplusplus-NewDelete:
 
 cplusplus.NewDelete (C++)


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D60281.215288.patch
Type: text/x-patch
Size: 1692 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20190815/ab992567/attachment.bin>


More information about the cfe-commits mailing list