[clang] [webkit.UncountedLambdaCapturesChecker] Fix debug assertion failure. (PR #117090)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-static-analyzer-1

Author: Ryosuke Niwa (rniwa)

<details>
<summary>Changes</summary>

Only call getThisType() on an instance method.

---
Full diff: https://github.com/llvm/llvm-project/pull/117090.diff


2 Files Affected:

- (modified) clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp (+2-1) 
- (modified) clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp (+4) 


``````````diff
diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp
index 3fb763e72e6809..9312bf0af16dbf 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedLambdaCapturesChecker.cpp
@@ -51,7 +51,8 @@ class UncountedLambdaCapturesChecker
 
       bool TraverseCXXMethodDecl(CXXMethodDecl *CXXMD) override {
         llvm::SaveAndRestore SavedDecl(ClsType);
-        ClsType = CXXMD->getThisType();
+        if (CXXMD && CXXMD->isInstance())
+          ClsType = CXXMD->getThisType();
         return DynamicRecursiveASTVisitor::TraverseCXXMethodDecl(CXXMD);
       }
 
diff --git a/clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp b/clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp
index 9bfcdea04755d2..b63ffed8809fef 100644
--- a/clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp
+++ b/clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp
@@ -1,5 +1,9 @@
 // RUN: %clang_analyze_cc1 -analyzer-checker=webkit.UncountedLambdaCapturesChecker -verify %s
 
+struct A {
+  static void b();
+};
+
 struct RefCountable {
   void ref() {}
   void deref() {}

``````````

</details>


https://github.com/llvm/llvm-project/pull/117090