llvmorg-github-actions[bot] wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-analysis
Author: PushkarSingh (iitianpushkar)
<details>
<summary>Changes</summary>
## Summary
This improves Lifetime Safety alias-chain diagnostics by explaining when an
aliasing step comes from a `[[clang::lifetimebound]]` contract.
For example:
```cpp
int *identity(int *p [[clang::lifetimebound]]) {
return p;
}
void test() {
int *q;
{
int i;
q = identity(&i);
}
(void)*q;
}
```
Instead of only saying:
```text
result of call to 'identity' aliases the storage of local variable 'i'
```
the diagnostic can now say:
```
result of call to 'identity' aliases the storage of local variable 'i' because
parameter 'p' is marked [[clang::lifetimebound]]
```
## Changes
- Track optional lifetimebound provenance on origin-flow facts.
- Preserve origin-flow facts while building the diagnostic alias chain.
- Extend alias-chain entries with optional lifetimebound information.
- Emit a more specific note when the aliasing step is caused by:a
lifetimebound function parameter
- a lifetimebound implicit object parameter
- Update Lifetime Safety tests for the new diagnostic wording.
Addresses #<!-- -->199667
---
Patch is 59.83 KiB, truncated to 20.00 KiB below, full version:
https://github.com/llvm/llvm-project/pull/206337.diff
12 Files Affected:
- (modified) clang/include/clang/Analysis/Analyses/LifetimeSafety/Facts.h
(+15-2)
- (modified)
clang/include/clang/Analysis/Analyses/LifetimeSafety/LifetimeSafety.h (+8-1)
- (modified)
clang/include/clang/Analysis/Analyses/LifetimeSafety/LoanPropagation.h (+14)
- (modified) clang/include/clang/Basic/DiagnosticSemaKinds.td (+2)
- (modified) clang/lib/Analysis/LifetimeSafety/Checker.cpp (+18-8)
- (modified) clang/lib/Analysis/LifetimeSafety/Facts.cpp (+2)
- (modified) clang/lib/Analysis/LifetimeSafety/FactsGenerator.cpp (+29-10)
- (modified) clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp (+41-5)
- (modified) clang/lib/Sema/SemaLifetimeSafety.h (+37-10)
- (modified) clang/test/Sema/LifetimeSafety/annotation-suggestions.cpp (+6-6)
- (modified) clang/test/Sema/LifetimeSafety/safety-c.c (+1-1)
- (modified) clang/test/Sema/LifetimeSafety/safety.cpp (+55-54)
``````````diff
diff --git a/clang/include/clang/Analysis/Analyses/LifetimeSafety/Facts.h
b/clang/include/clang/Analysis/Analyses/LifetimeSafety/Facts.h
index 5c671a93b149c..1e0ef8680f7db 100644
--- a/clang/include/clang/Analysis/Analyses/LifetimeSafety/Facts.h
+++ b/clang/include/clang/Analysis/Analyses/LifetimeSafety/Facts.h
@@ -131,24 +131,37 @@ class ExpireFact : public Fact {
};
class OriginFlowFact : public Fact {
+public:
+ struct LifetimeBoundInfo {
+ const Expr *Call = nullptr;
+ const ParmVarDecl *Param = nullptr;
+ bool isImplicitObject = false;
+ };
+
+private:
OriginID OIDDest;
OriginID OIDSrc;
// True if the destination origin should be killed (i.e., its current loans
// cleared) before the source origin's loans are flowed into it.
bool KillDest;
+ std::optional<LifetimeBoundInfo> LifetimeBound;
public:
static bool classof(const Fact *F) {
return F->getKind() == Kind::OriginFlow;
}
- OriginFlowFact(OriginID OIDDest, OriginID OIDSrc, bool KillDest)
+ OriginFlowFact(OriginID OIDDest, OriginID OIDSrc, bool KillDest,
+ std::optional<LifetimeBoundInfo> LifetimeBound = std::nullopt)
: Fact(Kind::OriginFlow), OIDDest(OIDDest), OIDSrc(OIDSrc),
- KillDest(KillDest) {}
+ KillDest(KillDest), LifetimeBound(LifetimeBound) {}
OriginID getDestOriginID() const { return OIDDest; }
OriginID getSrcOriginID() const { return OIDSrc; }
bool getKillDest() const { return KillDest; }
+ std::optional<LifetimeBoundInfo> getLifetimeBoundInfo() const {
+ return LifetimeBound;
+ }
void dump(llvm::raw_ostream &OS, const LoanManager &,
const OriginManager &OM) const override;
diff --git
a/clang/include/clang/Analysis/Analyses/LifetimeSafety/LifetimeSafety.h
b/clang/include/clang/Analysis/Analyses/LifetimeSafety/LifetimeSafety.h
index 80a23f18baebd..c177e9e222bdc 100644
--- a/clang/include/clang/Analysis/Analyses/LifetimeSafety/LifetimeSafety.h
+++ b/clang/include/clang/Analysis/Analyses/LifetimeSafety/LifetimeSafety.h
@@ -49,6 +49,12 @@ enum class WarningScope {
IntraTU // For warnings on functions local to a Translation Unit.
};
+struct LifetimeSafetyAliasChainEntry {
+ const Expr *E = nullptr;
+ const ParmVarDecl *LifetimeBoundParam = nullptr;
+ bool LifetimeBoundImplicitObject = false;
+};
+
/// Abstract interface for operations requiring Sema access.
///
/// This class exists to break a circular dependency: the LifetimeSafety
@@ -67,7 +73,8 @@ class LifetimeSafetySemaHelper {
virtual void reportUseAfterScope(const Expr *IssueExpr, const Expr *UseExpr,
const Expr *MovedExpr,
SourceLocation FreeLoc,
- llvm::ArrayRef<const Expr *> ExprChain) {}
+
llvm::ArrayRef<LifetimeSafetyAliasChainEntry>
+ AliasChain) {}
virtual void reportUseAfterReturn(const Expr *IssueExpr,
const Expr *ReturnExpr,
diff --git
a/clang/include/clang/Analysis/Analyses/LifetimeSafety/LoanPropagation.h
b/clang/include/clang/Analysis/Analyses/LifetimeSafety/LoanPropagation.h
index 724c6eee7d3c2..92d69f99c8794 100644
--- a/clang/include/clang/Analysis/Analyses/LifetimeSafety/LoanPropagation.h
+++ b/clang/include/clang/Analysis/Analyses/LifetimeSafety/LoanPropagation.h
@@ -29,6 +29,11 @@ namespace clang::lifetimes::internal {
using LoanSet = llvm::ImmutableSet<LoanID>;
using OriginLoanMap = llvm::ImmutableMap<OriginID, LoanSet>;
+struct OriginFlowChainStep {
+ OriginID OID;
+ const OriginFlowFact *FlowFact;
+};
+
class LoanPropagationAnalysis {
public:
LoanPropagationAnalysis(const CFG &C, AnalysisDeclContext &AC, FactManager
&F,
@@ -51,6 +56,15 @@ class LoanPropagationAnalysis {
llvm::SmallVector<OriginID>
buildOriginFlowChain(const UseFact *UF, const LoanID TargetLoan) const;
+ llvm::SmallVector<OriginFlowChainStep>
+ buildOriginFlowChainWithFacts(ProgramPoint StartPoint,
+ const OriginID StartOID,
+ const LoanID TargetLoan) const;
+
+ llvm::SmallVector<OriginFlowChainStep>
+ buildOriginFlowChainWithFacts(const UseFact *UF,
+ const LoanID TargetLoan) const;
+
private:
class Impl;
std::unique_ptr<Impl> PImpl;
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td
b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 7e20630708312..63d7b54b5e735 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -11069,6 +11069,8 @@ def note_lifetime_safety_escapes_to_global_here:
Note<"escapes to this global st
def note_lifetime_safety_escapes_to_static_storage_here: Note<"escapes to this
static storage">;
def note_lifetime_safety_lifetimebound_here: Note<"'lifetimebound' attribute
appears here on the definition">;
def note_lifetime_safety_aliases_storage : Note<"%0 aliases the storage of
%1">;
+def note_lifetime_safety_aliases_storage_lifetimebound : Note<
+ "%0 aliases the storage of %1 because %2 is marked
[[clang::lifetimebound]]">;
def warn_lifetime_safety_intra_tu_param_suggestion
: Warning<"parameter in intra-TU function should be marked "
diff --git a/clang/lib/Analysis/LifetimeSafety/Checker.cpp
b/clang/lib/Analysis/LifetimeSafety/Checker.cpp
index 746ebbfb15c39..335ca28861f4f 100644
--- a/clang/lib/Analysis/LifetimeSafety/Checker.cpp
+++ b/clang/lib/Analysis/LifetimeSafety/Checker.cpp
@@ -272,7 +272,8 @@ class LifetimeChecker {
// Scope-based expiry (use-after-scope).
SemaHelper->reportUseAfterScope(
IssueExpr, UF->getUseExpr(), MovedExpr, ExpiryLoc,
- getExprChain(LoanPropagation.buildOriginFlowChain(UF, LID)));
+ getAliasChain(
+ LoanPropagation.buildOriginFlowChainWithFacts(UF, LID)));
} else if (const auto *OEF =
CausingFact.dyn_cast<const OriginEscapesFact *>()) {
@@ -524,13 +525,22 @@ class LifetimeChecker {
/// Given a chain of origins that shows how a loan propagates, this function
/// extracts the corresponding expressions for each origin. Origins that
refer
/// to declarations (rather than expressions) are skipped.
- llvm::SmallVector<const Expr *>
- getExprChain(llvm::ArrayRef<OriginID> OriginFlowChain) {
- llvm::SmallVector<const Expr *> rs;
- for (const OriginID CurrOID : OriginFlowChain)
- if (const Expr *CurrExpr =
- FactMgr.getOriginMgr().getOrigin(CurrOID).getExpr())
- rs.push_back(CurrExpr);
+ llvm::SmallVector<LifetimeSafetyAliasChainEntry>
+ getAliasChain(llvm::ArrayRef<OriginFlowChainStep> OriginFlowChain) {
+ llvm::SmallVector<LifetimeSafetyAliasChainEntry> rs;
+ for (const OriginFlowChainStep &Step : OriginFlowChain) {
+ const Expr *CurrExpr =
FactMgr.getOriginMgr().getOrigin(Step.OID).getExpr();
+ if (!CurrExpr)
+ continue;
+
+ LifetimeSafetyAliasChainEntry Entry;
+ Entry.E = CurrExpr;
+ if (auto Info = Step.FlowFact->getLifetimeBoundInfo()) {
+ Entry.LifetimeBoundParam = Info->Param;
+ Entry.LifetimeBoundImplicitObject = Info->isImplicitObject;
+ }
+ rs.push_back(Entry);
+ }
return rs;
}
};
diff --git a/clang/lib/Analysis/LifetimeSafety/Facts.cpp
b/clang/lib/Analysis/LifetimeSafety/Facts.cpp
index 3d7fbcdacc830..6c1fb7ba4e214 100644
--- a/clang/lib/Analysis/LifetimeSafety/Facts.cpp
+++ b/clang/lib/Analysis/LifetimeSafety/Facts.cpp
@@ -46,6 +46,8 @@ void OriginFlowFact::dump(llvm::raw_ostream &OS, const
LoanManager &,
OS << "\tSrc: ";
OM.dump(getSrcOriginID(), OS);
OS << (getKillDest() ? "" : ", Merge");
+ if (getLifetimeBoundInfo())
+ OS << ", LifetimeBound";
OS << "\n";
}
diff --git a/clang/lib/Analysis/LifetimeSafety/FactsGenerator.cpp
b/clang/lib/Analysis/LifetimeSafety/FactsGenerator.cpp
index 8358c69a5165a..dd6838630947e 100644
--- a/clang/lib/Analysis/LifetimeSafety/FactsGenerator.cpp
+++ b/clang/lib/Analysis/LifetimeSafety/FactsGenerator.cpp
@@ -1085,28 +1085,46 @@ void FactsGenerator::handleFunctionCall(const Expr
*Call,
flow(CallList, getOriginsList(*Args[0]), /*Kill=*/true);
return;
}
- auto IsArgLifetimeBound = [FD, &Args](unsigned I) -> bool {
+ auto GetLifetimeBoundInfo = [FD, Call](unsigned I)
+ -> std::optional<OriginFlowFact::LifetimeBoundInfo> {
const ParmVarDecl *PVD = nullptr;
if (const auto *Method = dyn_cast<CXXMethodDecl>(FD);
Method && Method->isInstance() && !isa<CXXConstructorDecl>(FD)) {
if (I == 0)
// For the 'this' argument, the attribute is on the method itself.
- return implicitObjectParamIsLifetimeBound(Method) ||
- shouldTrackImplicitObjectArg(
- *Args[0], Method, /*RunningUnderLifetimeSafety=*/true);
+ return implicitObjectParamIsLifetimeBound(Method)
+ ? std::optional<OriginFlowFact::LifetimeBoundInfo>(
+ OriginFlowFact::LifetimeBoundInfo{
+ Call, /*Param=*/nullptr,
+ /*isImplicitObject=*/true})
+ : std::nullopt;
if ((I - 1) < Method->getNumParams())
// For explicit arguments, find the corresponding parameter
// declaration.
PVD = Method->getParamDecl(I - 1);
+ } else if (I < FD->getNumParams()) {
+ // For free functions or static methods.
+ PVD = FD->getParamDecl(I);
+ }
+ if (PVD && PVD->hasAttr<clang::LifetimeBoundAttr>())
+ return OriginFlowFact::LifetimeBoundInfo{Call, PVD,
+ /*isImplicitObject=*/false};
+ return std::nullopt;
+ };
+ auto IsArgLifetimeBound = [FD, &Args, &GetLifetimeBoundInfo](unsigned I) {
+ if (GetLifetimeBoundInfo(I))
+ return true;
+ if (const auto *Method = dyn_cast<CXXMethodDecl>(FD);
+ Method && Method->isInstance() && !isa<CXXConstructorDecl>(FD)) {
+ if (I == 0)
+ return shouldTrackImplicitObjectArg(
+ *Args[0], Method, /*RunningUnderLifetimeSafety=*/true);
} else if (I == 0 && shouldTrackFirstArgument(FD)) {
return true;
} else if (I == 1 && shouldTrackSecondArgument(FD)) {
return true;
- } else if (I < FD->getNumParams()) {
- // For free functions or static methods.
- PVD = FD->getParamDecl(I);
}
- return PVD ? PVD->hasAttr<clang::LifetimeBoundAttr>() : false;
+ return false;
};
auto shouldTrackPointerImplicitObjectArg = [FD, &Args](unsigned I) -> bool {
const auto *Method = dyn_cast<CXXMethodDecl>(FD);
@@ -1148,7 +1166,7 @@ void FactsGenerator::handleFunctionCall(const Expr *Call,
// inner origins.
CurrentBlockFacts.push_back(FactMgr.createFact<OriginFlowFact>(
CallList->getOuterOriginID(), ArgList->getOuterOriginID(),
- KillSrc));
+ KillSrc, GetLifetimeBoundInfo(I)));
KillSrc = false;
}
} else if (shouldTrackPointerImplicitObjectArg(I)) {
@@ -1164,7 +1182,8 @@ void FactsGenerator::handleFunctionCall(const Expr *Call,
// pointer/reference itself must not outlive the arguments. This
// only constrains the top-level origin.
CurrentBlockFacts.push_back(FactMgr.createFact<OriginFlowFact>(
- CallList->getOuterOriginID(), ArgList->getOuterOriginID(), KillSrc));
+ CallList->getOuterOriginID(), ArgList->getOuterOriginID(), KillSrc,
+ GetLifetimeBoundInfo(I)));
KillSrc = false;
}
}
diff --git a/clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp
b/clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp
index a67b1b3c0f826..01ef3b67e7351 100644
--- a/clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp
+++ b/clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp
@@ -202,14 +202,15 @@ class AnalysisImpl
return getLoans(getState(P), OID);
}
- llvm::SmallVector<OriginID>
- buildOriginFlowChain(ProgramPoint StartPoint, const OriginID StartOID,
- const LoanID TargetLoan) const {
+ llvm::SmallVector<OriginFlowChainStep>
+ buildOriginFlowChainWithFacts(ProgramPoint StartPoint,
+ const OriginID StartOID,
+ const LoanID TargetLoan) const {
assert(getLoans(StartOID, StartPoint).contains(TargetLoan) &&
"TargetLoan must be present in the StartOID at the StartPoint");
OriginID CurrOID = StartOID;
- llvm::SmallVector<OriginID> OriginFlowChain;
+ llvm::SmallVector<OriginFlowChainStep> OriginFlowChain;
llvm::ArrayRef<const Fact *> Facts =
FactMgr.getBlockContaining(StartPoint);
const auto *StartIt = llvm::find(Facts, StartPoint);
assert(StartIt != Facts.end());
@@ -231,7 +232,7 @@ class AnalysisImpl
const OriginID SrcOriginID = OFF->getSrcOriginID();
if (!getLoans(SrcOriginID, OFF).contains(TargetLoan))
continue;
- OriginFlowChain.push_back(SrcOriginID);
+ OriginFlowChain.push_back({SrcOriginID, OFF});
CurrOID = SrcOriginID;
}
@@ -243,6 +244,28 @@ class AnalysisImpl
return {};
}
+ llvm::SmallVector<OriginID>
+ buildOriginFlowChain(ProgramPoint StartPoint, const OriginID StartOID,
+ const LoanID TargetLoan) const {
+ llvm::SmallVector<OriginID> OriginFlowChain;
+ for (const OriginFlowChainStep &Step :
+ buildOriginFlowChainWithFacts(StartPoint, StartOID, TargetLoan))
+ OriginFlowChain.push_back(Step.OID);
+ return OriginFlowChain;
+ }
+
+ llvm::SmallVector<OriginFlowChainStep>
+ buildOriginFlowChainWithFacts(const UseFact *UF,
+ const LoanID TargetLoan) const {
+ for (const OriginList *Cur = UF->getUsedOrigins(); Cur;
+ Cur = Cur->peelOuterOrigin())
+ if (getLoans(Cur->getOuterOriginID(), UF).contains(TargetLoan))
+ return buildOriginFlowChainWithFacts(UF, Cur->getOuterOriginID(),
+ TargetLoan);
+
+ return {};
+ }
+
llvm::SmallVector<OriginID>
buildOriginFlowChain(const UseFact *UF, const LoanID TargetLoan) const {
for (const OriginList *Cur = UF->getUsedOrigins(); Cur;
@@ -315,4 +338,17 @@ LoanPropagationAnalysis::buildOriginFlowChain(const
UseFact *UF,
const LoanID TargetLoan) const {
return PImpl->buildOriginFlowChain(UF, TargetLoan);
}
+
+llvm::SmallVector<OriginFlowChainStep>
+LoanPropagationAnalysis::buildOriginFlowChainWithFacts(
+ ProgramPoint StartPoint, const OriginID StartOID,
+ const LoanID TargetLoan) const {
+ return PImpl->buildOriginFlowChainWithFacts(StartPoint, StartOID,
TargetLoan);
+}
+
+llvm::SmallVector<OriginFlowChainStep>
+LoanPropagationAnalysis::buildOriginFlowChainWithFacts(
+ const UseFact *UF, const LoanID TargetLoan) const {
+ return PImpl->buildOriginFlowChainWithFacts(UF, TargetLoan);
+}
} // namespace clang::lifetimes::internal
diff --git a/clang/lib/Sema/SemaLifetimeSafety.h
b/clang/lib/Sema/SemaLifetimeSafety.h
index a3d546792fe41..3d8ca9e90abff 100644
--- a/clang/lib/Sema/SemaLifetimeSafety.h
+++ b/clang/lib/Sema/SemaLifetimeSafety.h
@@ -103,7 +103,8 @@ class LifetimeSafetySemaHelperImpl : public
LifetimeSafetySemaHelper {
void reportUseAfterScope(const Expr *IssueExpr, const Expr *UseExpr,
const Expr *MovedExpr, SourceLocation FreeLoc,
- llvm::ArrayRef<const Expr *> ExprChain) override {
+ llvm::ArrayRef<LifetimeSafetyAliasChainEntry>
+ AliasChain) override {
unsigned DiagID = MovedExpr
? diag::warn_lifetime_safety_use_after_scope_moved
: diag::warn_lifetime_safety_use_after_scope;
@@ -117,7 +118,7 @@ class LifetimeSafetySemaHelperImpl : public
LifetimeSafetySemaHelper {
S.Diag(FreeLoc, diag::note_lifetime_safety_destroyed_here)
<< DestroyedSubject;
- reportAliasingChain(ExprChain);
+ reportAliasingChain(AliasChain);
S.Diag(UseExpr->getExprLoc(), diag::note_lifetime_safety_used_here)
<< UseExpr->getSourceRange();
@@ -655,20 +656,46 @@ class LifetimeSafetySemaHelperImpl : public
LifetimeSafetySemaHelper {
return CurrExpr->getSourceRange() != LastExpr->getSourceRange();
}
- void reportAliasingChain(llvm::ArrayRef<const Expr *> OriginExprChain) {
+ void reportAliasingChain(
+ llvm::ArrayRef<LifetimeSafetyAliasChainEntry> OriginExprChain) {
if (OriginExprChain.empty())
return;
- const Expr *LastExpr = OriginExprChain.back();
+ LifetimeSafetyAliasChainEntry Last = OriginExprChain.back();
+ const Expr *LastExpr = Last.E;
std::string IssueStr = getDiagSubjectDescription(LastExpr);
- for (const Expr *CurrExpr : reverse(OriginExprChain.drop_back())) {
- if (!shouldShowInAliasChain(CurrExpr, LastExpr))
+ for (LifetimeSafetyAliasChainEntry Curr :
+ reverse(OriginExprChain.drop_back())) {
+ const Expr *CurrExpr = Curr.E;
+ if (!shouldShowInAliasChain(CurrExpr, LastExpr)) {
+ if (!Last.LifetimeBoundImplicitObject && !Last.LifetimeBoundParam &&
+ (Curr.LifetimeBoundImplicitObject || Curr.LifetimeBoundParam)) {
+ Last.LifetimeBoundImplicitObject = Curr.LifetimeBoundImplicitObject;
+ Last.LifetimeBoundParam = Curr.LifetimeBoundParam;
+ }
continue;
- S.Diag(CurrExpr->getBeginLoc(),
- diag::note_lifetime_safety_aliases_storage)
- << CurrExpr->getSourceRange() << getDiagSubjectDescription(CurrExpr)
- << IssueStr;
+ }
+ if (Last.LifetimeBoundImplicitObject || Last.LifetimeBoundParam) {
+ std::string LifetimeBoundSubject = "the implicit object parameter";
+ if (Last.LifetimeBoundParam) {
+ LifetimeBoundSubject = "parameter ";
+ if (Last.LifetimeBoundParam->getIdentifier())
+ LifetimeBoundSubject +=
+ "'" + Last.LifetimeBoundParam->getNameAsString() + "'";
+ else
+ LifetimeBoundSubject += "'<unnamed>'";
+ }
+ S.Diag(CurrExpr->getBeginLoc(),
+ diag::note_lifetime_safety_aliases_storage_lifetimebound)
+ << CurrExpr->getSourceRange() <<
getDiagSubjectDescription(CurrExpr)
+ << IssueStr << LifetimeBoundSubject;
+ } else
+ S.Diag(CurrExpr->getBeginLoc(),
+ diag::note_lifetime_safety_aliases_storage)
+ << CurrExpr->getSourceRange() <<
getDiagSubjectDescription(CurrExpr)
+ << IssueStr;
+ Last = Curr;
LastExpr = CurrExpr;
}
}
diff --git a/clang/test/Sema/LifetimeSafety/annotation-suggestions.cpp
b/clang/test/Sema/LifetimeSafety/annotation-suggestions.cpp
index 98c528516b8e7..f551f17d8f5e4 100644
--- a/clang/test/Sema/LifetimeSafety/annotation-suggestions.cpp
+++ b/clang/test/Sema/LifetimeSafety/annotation-suggestions.cpp
@@ -278,21 +278,21 @@ View return_view_field(const ViewProvider& v) { //
expected-warning {{paramet
void test_get_on_temporary_pointer() {
const ReturnsSelf* s_ref = &ReturnsSelf().get(); // expected-warning
{{temporary object does not live long enough}}.
// expected-note@-1
{{temporary object is destroyed here}}
- // expected-note@-2
{{result of call to 'get' aliases the storage of temporary object}}
+ // expected-note@-2
{{result of call to 'get' aliases the storage of temporary object because the
implicit object parameter is marked [[clang::lifetimebound]]}}
(void)s_ref; // expected-note {{later
used here}}
}
void test_get_on_temporary_ref() {
const ReturnsSelf& s_ref = ReturnsSelf().get(); // expected-warning
{{temporary object does not live long enough}}.
// expected-note@-1
{{temporary object is destroyed here}}
- // expected-note@-2
{{result of call to 'get' aliases the storage of temporary object}}
+ // expected-note@-2
{{result of call to 'get' aliases the storage of ...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/206337
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