llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-static-analyzer-1
Author: Ryosuke Niwa (rniwa)
<details>
<summary>Changes</summary>
This PR adds the WebKit checker support for
[[clang::annotate_type("webkit.pointerconversion")]].
When this attribute is set on the return value of a function, the function is
treated as safe to call anywhere and the return value's pointer origin is the
argument.`
---
Full diff: https://github.com/llvm/llvm-project/pull/141277.diff
2 Files Affected:
- (modified) clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
(+12)
- (modified) clang/test/Analysis/Checkers/WebKit/call-args-safe-functions.cpp
(+9-1)
``````````diff
diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
index 4ddd11495f534..cd33476344a34 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
@@ -468,6 +468,18 @@ bool isPtrConversion(const FunctionDecl *F) {
FunctionName == "checked_objc_cast")
return true;
+ auto ReturnType = F->getReturnType();
+ if (auto *Type = ReturnType.getTypePtrOrNull()) {
+ if (auto *AttrType = dyn_cast<AttributedType>(Type)) {
+ if (auto *Attr = AttrType->getAttr()) {
+ if (auto *AnnotateType = dyn_cast<AnnotateTypeAttr>(Attr)) {
+ if (AnnotateType->getAnnotation() == "webkit.pointerconversion")
+ return true;
+ }
+ }
+ }
+ }
+
return false;
}
diff --git a/clang/test/Analysis/Checkers/WebKit/call-args-safe-functions.cpp
b/clang/test/Analysis/Checkers/WebKit/call-args-safe-functions.cpp
index a87446564870c..9f6dbade3c746 100644
--- a/clang/test/Analysis/Checkers/WebKit/call-args-safe-functions.cpp
+++ b/clang/test/Analysis/Checkers/WebKit/call-args-safe-functions.cpp
@@ -1,5 +1,4 @@
// RUN: %clang_analyze_cc1
-analyzer-checker=alpha.webkit.UncountedCallArgsChecker -verify %s
-// expected-no-diagnostics
class Base {
public:
@@ -44,6 +43,12 @@ inline Target* uncheckedDowncast(Source* source)
return static_cast<Target*>(source);
}
+template<typename Target, typename Source>
+Target* [[clang::annotate_type("webkit.pointerconversion")]]
newCastFunction(Source*);
+
+template<typename Target, typename Source>
+Target* [[clang::annotate_type("unrelated-annotation")]]
badCastFunction(Source*);
+
template<typename... Types>
String toString(const Types&... values);
@@ -52,5 +57,8 @@ void foo(OtherObject* other)
dynamicDowncast<SubDerived>(other->obj());
checkedDowncast<SubDerived>(other->obj());
uncheckedDowncast<SubDerived>(other->obj());
+ newCastFunction<SubDerived>(other->obj());
+ badCastFunction<SubDerived>(other->obj());
+ // expected-warning@-1{{Call argument is uncounted and unsafe}}
toString(other->obj());
}
``````````
</details>
https://github.com/llvm/llvm-project/pull/141277
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