================
@@ -878,6 +878,65 @@ void FactsGenerator::handleImplicitObjectFieldUses(const
Expr *Call,
});
}
+void FactsGenerator::handleLifetimeCaptureBy(const FunctionDecl *FD,
+ ArrayRef<const Expr *> Args) {
+ if (Args.empty())
+ return;
+ // FIXME: Add support for capture_by on constructors.
+ if (isa<CXXConstructorDecl>(FD))
+ return;
+ const auto *Method = dyn_cast<CXXMethodDecl>(FD);
+ bool IsInstance =
+ Method && Method->isInstance() && !isa<CXXConstructorDecl>(FD);
+ auto getArgCaptureBy = [FD,
+ IsInstance](unsigned I) -> LifetimeCaptureByAttr * {
+ const ParmVarDecl *PVD = nullptr;
+ if (IsInstance) {
+ // FIXME: Add support for I == 0 i.e. capture_by on function declarations
+ if (I > 0 && I - 1 < FD->getNumParams())
+ PVD = FD->getParamDecl(I - 1);
+ } else {
+ if (I < FD->getNumParams())
+ PVD = FD->getParamDecl(I);
+ }
+ return PVD ? PVD->getAttr<LifetimeCaptureByAttr>() : nullptr;
+ };
+ for (unsigned I = 0; I < Args.size(); ++I) {
+ const LifetimeCaptureByAttr *Attr = getArgCaptureBy(I);
+ if (!Attr)
+ continue;
+ OriginList *CapturedOriginList = getOriginsList(*Args[I]);
+ if (!CapturedOriginList)
+ continue;
+ if (isGslPointerType(Args[I]->getType())) {
+ assert(!Args[I]->isGLValue() || CapturedOriginList->getLength() >= 2);
+ CapturedOriginList = getRValueOrigins(Args[I], CapturedOriginList);
+ }
----------------
usx95 wrote:
IIUC, we can completely skip this.
We might need this to support:
```cpp
vector<std::string_view> views;
std::string_view v;
views.push_back(v);
```
Because push_back accepts a reference : `void pushback(const std::string_view&
element)`
But we can do this in the future. This is a a very subtle hack and an
unfortunate design flaw in capture by!
https://github.com/llvm/llvm-project/pull/196884
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