[clang][analyzer] Handle CXXParenInitListExpr alongside InitListExpr #136041
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@llvm/pr-subscribers-clang-static-analyzer-1 @llvm/pr-subscribers-clang Author: Fangyi Zhou (fangyi-zhou) ChangesAs reported in #135665, C++20 parenthesis initializer list expressions are not handled correctly and were causing crashes. This commit attempts to fix the issue by handing parenthesis initializer lists along side existing initializer lists. Full diff: https://github.com/llvm/llvm-project/pull/136041.diff 3 Files Affected:
diff --git a/clang/lib/StaticAnalyzer/Checkers/DynamicTypePropagation.cpp b/clang/lib/StaticAnalyzer/Checkers/DynamicTypePropagation.cpp
index a0bf776b11f53..6fad0601e87ca 100644
--- a/clang/lib/StaticAnalyzer/Checkers/DynamicTypePropagation.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/DynamicTypePropagation.cpp
@@ -379,10 +379,12 @@ void DynamicTypePropagation::checkPostCall(const CallEvent &Call,
// aggregates, and in such case no top-frame constructor will be called.
// Figure out if we need to do anything in this case.
// FIXME: Instead of relying on the ParentMap, we should have the
- // trigger-statement (InitListExpr in this case) available in this
- // callback, ideally as part of CallEvent.
- if (isa_and_nonnull<InitListExpr>(
- LCtx->getParentMap().getParent(Ctor->getOriginExpr())))
+ // trigger-statement (InitListExpr or CXXParenListInitExpr in this case)
+ // available in this callback, ideally as part of CallEvent.
+ const Stmt *Parent =
+ LCtx->getParentMap().getParent(Ctor->getOriginExpr());
+ if (isa_and_nonnull<InitListExpr>(Parent) ||
+ isa_and_nonnull<CXXParenListInitExpr>(Parent))
return;
recordFixedType(Target, cast<CXXConstructorDecl>(LCtx->getDecl()), C);
diff --git a/clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp b/clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
index 7e878f922a939..914859861b948 100644
--- a/clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
+++ b/clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
@@ -644,9 +644,11 @@ void ExprEngine::handleConstructor(const Expr *E,
// FIXME: For now this code essentially bails out. We need to find the
// correct target region and set it.
// FIXME: Instead of relying on the ParentMap, we should have the
- // trigger-statement (InitListExpr in this case) passed down from CFG or
- // otherwise always available during construction.
- if (isa_and_nonnull<InitListExpr>(LCtx->getParentMap().getParent(E))) {
+ // trigger-statement (InitListExpr or CXXParenListInitExpr in this case)
+ // passed down from CFG or otherwise always available during construction.
+ if (isa_and_nonnull<InitListExpr>(LCtx->getParentMap().getParent(E)) ||
+ isa_and_nonnull<CXXParenListInitExpr>(
+ LCtx->getParentMap().getParent(E))) {
MemRegionManager &MRMgr = getSValBuilder().getRegionManager();
Target = loc::MemRegionVal(MRMgr.getCXXTempObjectRegion(E, LCtx));
CallOpts.IsCtorOrDtorWithImproperlyModeledTargetRegion = true;
@@ -1017,7 +1019,8 @@ void ExprEngine::VisitCXXNewExpr(const CXXNewExpr *CNE, ExplodedNode *Pred,
// values are properly placed inside the required region, however if an
// initializer list is used, this doesn't happen automatically.
auto *Init = CNE->getInitializer();
- bool isInitList = isa_and_nonnull<InitListExpr>(Init);
+ bool isInitList = isa_and_nonnull<InitListExpr>(Init) ||
+ isa_and_nonnull<CXXParenListInitExpr>(Init);
QualType ObjTy =
isInitList ? Init->getType() : CNE->getType()->getPointeeType();
diff --git a/clang/test/Analysis/PR135665.cpp b/clang/test/Analysis/PR135665.cpp
new file mode 100644
index 0000000000000..124b8c9b97b04
--- /dev/null
+++ b/clang/test/Analysis/PR135665.cpp
@@ -0,0 +1,19 @@
+// RUN: %clang_analyze_cc1 -std=c++20 -analyzer-checker=core -verify %s
+
+// expected-no-diagnostics
+
+template<typename... F>
+struct overload : public F...
+{
+ using F::operator()...;
+};
+
+template<typename... F>
+overload(F&&...) -> overload<F...>;
+
+int main()
+{
+ const auto l = overload([](const int* i) {});
+
+ return 0;
+}
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As reported in llvm#135665, C++20 parenthesis initializer list expressions are not handled correctly and were causing crashes. This commit attempts to fix the issue by handing parenthesis initializer lists along side existing initializer lists.
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@Xazax-hun @steakhal Please take a look. |
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@fangyi-zhou Congratulations on having your first Pull Request (PR) merged into the LLVM Project! Your changes will be combined with recent changes from other authors, then tested by our build bots. If there is a problem with a build, you may receive a report in an email or a comment on this PR. Please check whether problems have been caused by your change specifically, as the builds can include changes from many authors. It is not uncommon for your change to be included in a build that fails due to someone else's changes, or infrastructure issues. How to do this, and the rest of the post-merge process, is covered in detail here. If your change does cause a problem, it may be reverted, or you can revert it yourself. This is a normal part of LLVM development. You can fix your changes and open a new PR to merge them again. If you don't get any reports, no action is required from you. Your changes are working as expected, well done! |
Oh, I see. IIUC |
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Ah, I see now your perspective. |
As reported in #135665, C++20 parenthesis initializer list expressions are not handled correctly and were causing crashes. This commit attempts to fix the issue by handing parenthesis initializer lists along side existing initializer lists.