[clang] [llvm] [LifetimeSafety] Add lifetimebound inference for std::make_unique (PR #191632)

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Wed Apr 15 11:45:58 PDT 2026


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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/lib/Analysis/LifetimeSafety/FactsGenerator.cpp clang/lib/Analysis/LifetimeSafety/Origins.cpp clang/lib/Sema/SemaAttr.cpp clang/lib/Sema/SemaTemplateInstantiateDecl.cpp clang/test/Sema/Inputs/lifetime-analysis.h clang/test/Sema/warn-lifetime-analysis-nocfg.cpp clang/test/Sema/warn-lifetime-safety-dangling-field.cpp clang/test/Sema/warn-lifetime-safety-suggestions.cpp clang/test/Sema/warn-lifetime-safety.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaAttr.cpp b/clang/lib/Sema/SemaAttr.cpp
index c103bf0af..e6822411a 100644
--- a/clang/lib/Sema/SemaAttr.cpp
+++ b/clang/lib/Sema/SemaAttr.cpp
@@ -222,7 +222,8 @@ void Sema::inferGslOwnerPointerAttribute(CXXRecordDecl *Record) {
 }
 
 static const CXXNewExpr *findCXXNewExpr(const Stmt *S) {
-  if (!S) return nullptr;
+  if (!S)
+    return nullptr;
   if (const auto *E = dyn_cast<CXXNewExpr>(S))
     return E;
   for (const Stmt *Child : S->children())
@@ -265,8 +266,7 @@ void Sema::inferLifetimeBoundAttribute(FunctionDecl *FD) {
   // Handle std::make_unique to propagate lifetimebound attributes from the
   // constructed type's constructor to make_unique's parameters by looking
   // into its body.
-  if (FD->getDeclName().isIdentifier() &&
-      FD->getName() == "make_unique") {
+  if (FD->getDeclName().isIdentifier() && FD->getName() == "make_unique") {
     const FunctionDecl *BodyDecl = nullptr;
     if (FD->getBody(BodyDecl))
       if (const CXXNewExpr *NewExpr = findCXXNewExpr(BodyDecl->getBody()))
@@ -275,8 +275,8 @@ void Sema::inferLifetimeBoundAttribute(FunctionDecl *FD) {
             for (unsigned i = 0; i < Ctor->getNumParams(); ++i)
               if (Ctor->getParamDecl(i)->hasAttr<LifetimeBoundAttr>() &&
                   i < FD->getNumParams())
-                FD->getParamDecl(i)->addAttr(
-                    LifetimeBoundAttr::CreateImplicit(Context, FD->getLocation()));
+                FD->getParamDecl(i)->addAttr(LifetimeBoundAttr::CreateImplicit(
+                    Context, FD->getLocation()));
     return;
   }
 
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index a633f8af1..81f730cec 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -5969,7 +5969,6 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
     // context seems wrong. Investigate more.
     ActOnFinishFunctionBody(Function, Body.get(), /*IsInstantiation=*/true);
 
-
     inferLifetimeBoundAttribute(Function);
 
     checkReferenceToTULocalFromOtherTU(Function, PointOfInstantiation);

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https://github.com/llvm/llvm-project/pull/191632


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