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[LifetimeSafety] Add language option for experimental lifetime safety #149592

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Merged
merged 1 commit into from
Jul 22, 2025
+12 −3
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[LifetimeSafety] Add language option for experimental lifetime safety #149592

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2 changes: 2 additions & 0 deletions clang/include/clang/Basic/LangOptions.def
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Original file line number Diff line number Diff line change
Expand Up @@ -491,6 +491,8 @@ LANGOPT(CheckConstexprFunctionBodies, 1, 1, Benign,

LANGOPT(BoundsSafety, 1, 0, NotCompatible, "Bounds safety extension for C")

LANGOPT(EnableLifetimeSafety, 1, 0, NotCompatible, "Experimental lifetime safety analysis for C++")

LANGOPT(PreserveVec3Type, 1, 0, NotCompatible, "Preserve 3-component vector type")

#undef LANGOPT
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8 changes: 8 additions & 0 deletions clang/include/clang/Driver/Options.td
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Expand Up @@ -1904,6 +1904,14 @@ defm bounds_safety : BoolFOption<
BothFlags<[], [CC1Option],
" experimental bounds safety extension for C">>;

defm lifetime_safety : BoolFOption<
"experimental-lifetime-safety",
LangOpts<"EnableLifetimeSafety">, DefaultFalse,
PosFlag<SetTrue, [], [CC1Option], "Enable">,
NegFlag<SetFalse, [], [CC1Option], "Disable">,
BothFlags<[], [CC1Option],
" experimental lifetime safety for C++">>;

defm addrsig : BoolFOption<"addrsig",
CodeGenOpts<"Addrsig">, DefaultFalse,
PosFlag<SetTrue, [], [ClangOption, CC1Option], "Emit">,
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3 changes: 1 addition & 2 deletions clang/lib/Sema/AnalysisBasedWarnings.cpp
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Expand Up @@ -2901,8 +2901,7 @@ void clang::sema::AnalysisBasedWarnings::IssueWarnings(
.setAlwaysAdd(Stmt::UnaryOperatorClass);
}

bool EnableLifetimeSafetyAnalysis = !Diags.isIgnored(
diag::warn_experimental_lifetime_safety_dummy_warning, D->getBeginLoc());
bool EnableLifetimeSafetyAnalysis = S.getLangOpts().EnableLifetimeSafety;
// Install the logical handler.
std::optional<LogicalErrorHandler> LEH;
if (LogicalErrorHandler::hasActiveDiagnostics(Diags, D->getBeginLoc())) {
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2 changes: 1 addition & 1 deletion clang/test/Sema/warn-lifetime-safety-dataflow.cpp
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@@ -1,4 +1,4 @@
// RUN: %clang_cc1 -mllvm -debug-only=LifetimeFacts -Wexperimental-lifetime-safety %s 2>&1 | FileCheck %s
// RUN: %clang_cc1 -fexperimental-lifetime-safety -mllvm -debug-only=LifetimeFacts -Wexperimental-lifetime-safety %s 2>&1 | FileCheck %s
// REQUIRES: asserts

struct MyObj {
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