[PATCH] D66621: [clang] Devirtualization for classes with destructors marked as 'final'
Logan Smith via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Thu Aug 22 18:57:07 PDT 2019
logan-5 updated this revision to Diff 216757.
logan-5 added a comment.
Tweaked comment wording for accuracy.
Repository:
rC Clang
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D66621/new/
https://reviews.llvm.org/D66621
Files:
clang/lib/AST/DeclCXX.cpp
clang/test/CodeGenCXX/devirtualize-virtual-function-calls-final.cpp
Index: clang/test/CodeGenCXX/devirtualize-virtual-function-calls-final.cpp
===================================================================
--- clang/test/CodeGenCXX/devirtualize-virtual-function-calls-final.cpp
+++ clang/test/CodeGenCXX/devirtualize-virtual-function-calls-final.cpp
@@ -24,6 +24,20 @@
}
}
+namespace Test2a {
+ struct A {
+ virtual ~A() final {}
+ virtual int f();
+ };
+
+ // CHECK-LABEL: define i32 @_ZN6Test2a1fEPNS_1AE
+ int f(A *a) {
+ // CHECK: call i32 @_ZN6Test2a1A1fEv
+ return a->f();
+ }
+}
+
+
namespace Test3 {
struct A {
virtual int f();
Index: clang/lib/AST/DeclCXX.cpp
===================================================================
--- clang/lib/AST/DeclCXX.cpp
+++ clang/lib/AST/DeclCXX.cpp
@@ -2067,9 +2067,11 @@
if (DevirtualizedMethod->hasAttr<FinalAttr>())
return DevirtualizedMethod;
- // Similarly, if the class itself is marked 'final' it can't be overridden
- // and we can therefore devirtualize the member function call.
- if (BestDynamicDecl->hasAttr<FinalAttr>())
+ // Similarly, if the class itself or its destructor is marked 'final',
+ // the class can't be derived from and we can therefore devirtualize the
+ // member function call.
+ if (BestDynamicDecl->hasAttr<FinalAttr>() ||
+ BestDynamicDecl->getDestructor()->hasAttr<FinalAttr>())
return DevirtualizedMethod;
if (const auto *DRE = dyn_cast<DeclRefExpr>(Base)) {
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