https://github.com/spavloff created https://github.com/llvm/llvm-project/pull/155213
Anaysis for noreturn attribute now misses the case when an assignment to a variable is made inside a lambda function call. This change fixes that case. >From 52499a2a3fde7c66f398e5730f782e0faf6f6e2d Mon Sep 17 00:00:00 2001 From: Serge Pavlov <[email protected]> Date: Mon, 25 Aug 2025 12:20:21 +0700 Subject: [PATCH] [clang] Check captured variables for noreturn attribute Anaysis for noreturn attribute now misses the case when an assignment to a variable is made inside a lambda function call. This change fixes that case. --- clang/lib/Sema/AnalysisBasedWarnings.cpp | 35 ++++++++++++++++++++++++ clang/test/SemaCXX/noreturn-vars.cpp | 13 +++++++++ 2 files changed, 48 insertions(+) diff --git a/clang/lib/Sema/AnalysisBasedWarnings.cpp b/clang/lib/Sema/AnalysisBasedWarnings.cpp index 0b94b1044f072..fe1498003e7da 100644 --- a/clang/lib/Sema/AnalysisBasedWarnings.cpp +++ b/clang/lib/Sema/AnalysisBasedWarnings.cpp @@ -467,6 +467,41 @@ struct TransferFunctions : public StmtVisitor<TransferFunctions> { AllValuesAreNoReturn = false; } } + + void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *CE) { + if (CE->getOperator() == OO_Call && CE->getNumArgs() > 0) { + Expr *Obj = CE->getArg(0)->IgnoreParenCasts(); + if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Obj)) + Obj = MTE->getSubExpr(); + if (auto *DRE = dyn_cast<DeclRefExpr>(Obj)) { + auto *D = dyn_cast<VarDecl>(DRE->getDecl()); + if (D->hasInit()) + Obj = D->getInit(); + } + Visit(Obj); + } + } + + void VisitLambdaExpr(LambdaExpr *LE) { + for (const LambdaCapture &Capture : LE->captures()) + if (Capture.capturesVariable()) + if (const VarDecl *VD = dyn_cast<VarDecl>(Capture.getCapturedVar())) + if (VD == Var) + if (Capture.getCaptureKind() == LCK_ByRef) + AllValuesAreNoReturn = false; + } + + void VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *MTE) { + Visit(MTE->getSubExpr()); + } + + void VisitExprWithCleanups(FullExpr *FE) { + Visit(FE->getSubExpr()); + } + + void VisitCXXConstructExpr(CXXConstructExpr *CE) { + Visit(CE->getArg(0)); + } }; } // namespace diff --git a/clang/test/SemaCXX/noreturn-vars.cpp b/clang/test/SemaCXX/noreturn-vars.cpp index ca65fcf5ca31d..3b2473c1bc670 100644 --- a/clang/test/SemaCXX/noreturn-vars.cpp +++ b/clang/test/SemaCXX/noreturn-vars.cpp @@ -225,3 +225,16 @@ extern void abc_02(func_type *); abc_02(&func_ptr); func_ptr(); } // expected-warning {{function declared 'noreturn' should not return}} + +[[noreturn]] void test_lambda() { + func_type func_ptr = noret; + [&func_ptr]() { func_ptr = ordinary; } (); + func_ptr(); +} // expected-warning {{function declared 'noreturn' should not return}} + +[[noreturn]] void test_lambda_var(int x) { + func_type func_ptr = noret; + auto LF = [&](){func_ptr = ordinary;}; + LF(); + func_ptr(); +} // expected-warning {{function declared 'noreturn' should not return}} _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
