[clang] Add absl::{Span,string_view} to UnsafeBufferUsage analysis (PR #127698)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-analysis

Author: Max (mxms0)

<details>
<summary>Changes</summary>

Add support for absl Span and string_view types to warn on their unsafe usage. 

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Full diff: https://github.com/llvm/llvm-project/pull/127698.diff


1 Files Affected:

- (modified) clang/lib/Analysis/UnsafeBufferUsage.cpp (+3-1) 


``````````diff
diff --git a/clang/lib/Analysis/UnsafeBufferUsage.cpp b/clang/lib/Analysis/UnsafeBufferUsage.cpp
index c51398698922b..e0f9a683bdb6c 100644
--- a/clang/lib/Analysis/UnsafeBufferUsage.cpp
+++ b/clang/lib/Analysis/UnsafeBufferUsage.cpp
@@ -891,7 +891,9 @@ AST_MATCHER(CallExpr, hasUnsafeSnprintfBuffer) {
 
   // Pattern 1:
   static StringRef SizedObjs[] = {"span", "array", "vector",
-                                  "basic_string_view", "basic_string"};
+                                  "basic_string_view", "basic_string",
+                                   // Support absl::Span and absl::string_view
+                                  "Span", "string_view" };
   Buf = Buf->IgnoreParenImpCasts();
   Size = Size->IgnoreParenImpCasts();
   if (auto *MCEPtr = dyn_cast<CXXMemberCallExpr>(Buf))

``````````

</details>


https://github.com/llvm/llvm-project/pull/127698