[clang] Propagate lifetimebound from formal parameters to those in the canonical declaration and use that for analysis (PR #107627)

[via cfe-commits]

================
@@ -266,6 +262,20 @@ void Sema::inferLifetimeBoundAttribute(FunctionDecl *FD) {
               LifetimeBoundAttr::CreateImplicit(Context, FD->getLocation()));
       }
     }
+  } else if (auto *CanonDecl = FD->getCanonicalDecl(); FD != CanonDecl) {
+    // Propagate the lifetimebound attribute from parameters to the canonical
+    // declaration.
+    // Note that this doesn't include the implicit 'this' parameter, as the
+    // attribute is applied to the function type in that case.
+    const unsigned int NP = std::min(NumParams, CanonDecl->getNumParams());
+    for (unsigned int I = 0; I < NP; ++I) {
+      auto *CanonParam = CanonDecl->getParamDecl(I);
+      if (!CanonParam->hasAttr<LifetimeBoundAttr>() &&
+          FD->getParamDecl(I)->hasAttr<LifetimeBoundAttr>()) {
----------------
higher-performance wrote:

I reverted that rewrite due to the bug.

https://github.com/llvm/llvm-project/pull/107627
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits