[WebKit Checkers] Treat offsetof as a trivial expression. #126996
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@llvm/pr-subscribers-clang-static-analyzer-1 Author: Ryosuke Niwa (rniwa) ChangesFull diff: https://github.com/llvm/llvm-project/pull/126996.diff 2 Files Affected:
diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
index d40b4b4dbb560..b823e048a4d10 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
@@ -503,6 +503,11 @@ class TrivialFunctionAnalysisVisitor
return true;
}
+ bool VisitOffsetOfExpr(const OffsetOfExpr* OE) {
+ // offsetof(T) is considered trivial.
+ return true;
+ }
+
bool VisitCXXMemberCallExpr(const CXXMemberCallExpr *MCE) {
if (!checkArguments(MCE))
return false;
diff --git a/clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp b/clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp
index ffeecbf87c451..cf403851b74fd 100644
--- a/clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp
+++ b/clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp
@@ -77,6 +77,8 @@ T&& forward(T& arg);
template<typename T>
T&& move( T&& t );
+#define offsetof(t, d) __builtin_offsetof(t, d)
+
} // namespace std
bool isMainThread();
@@ -373,6 +375,7 @@ class RefCounted {
double y;
};
void trivial68() { point pt = { 1.0 }; }
+ unsigned trivial69() { return offsetof(RefCounted, children); }
static RefCounted& singleton() {
static RefCounted s_RefCounted;
@@ -560,6 +563,7 @@ class UnrelatedClass {
getFieldTrivial().trivial66()->trivial6(); // no-warning
getFieldTrivial().trivial67()->trivial6(); // no-warning
getFieldTrivial().trivial68(); // no-warning
+ getFieldTrivial().trivial69(); // no-warning
RefCounted::singleton().trivial18(); // no-warning
RefCounted::singleton().someFunction(); // no-warning
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@llvm/pr-subscribers-clang Author: Ryosuke Niwa (rniwa) ChangesFull diff: https://github.com/llvm/llvm-project/pull/126996.diff 2 Files Affected:
diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
index d40b4b4dbb560..b823e048a4d10 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
@@ -503,6 +503,11 @@ class TrivialFunctionAnalysisVisitor
return true;
}
+ bool VisitOffsetOfExpr(const OffsetOfExpr* OE) {
+ // offsetof(T) is considered trivial.
+ return true;
+ }
+
bool VisitCXXMemberCallExpr(const CXXMemberCallExpr *MCE) {
if (!checkArguments(MCE))
return false;
diff --git a/clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp b/clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp
index ffeecbf87c451..cf403851b74fd 100644
--- a/clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp
+++ b/clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp
@@ -77,6 +77,8 @@ T&& forward(T& arg);
template<typename T>
T&& move( T&& t );
+#define offsetof(t, d) __builtin_offsetof(t, d)
+
} // namespace std
bool isMainThread();
@@ -373,6 +375,7 @@ class RefCounted {
double y;
};
void trivial68() { point pt = { 1.0 }; }
+ unsigned trivial69() { return offsetof(RefCounted, children); }
static RefCounted& singleton() {
static RefCounted s_RefCounted;
@@ -560,6 +563,7 @@ class UnrelatedClass {
getFieldTrivial().trivial66()->trivial6(); // no-warning
getFieldTrivial().trivial67()->trivial6(); // no-warning
getFieldTrivial().trivial68(); // no-warning
+ getFieldTrivial().trivial69(); // no-warning
RefCounted::singleton().trivial18(); // no-warning
RefCounted::singleton().someFunction(); // no-warning
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✅ With the latest revision this PR passed the C/C++ code formatter. |
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Thanks for the review! |
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