[PATCH] D56928: Support attribute used in member funcs of class templates

[Rafael Auler via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rC352740: Support attribute used in member funcs of class templates (authored by rafauler, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D56928?vs=184467&id=184470#toc

Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D56928/new/

https://reviews.llvm.org/D56928

Files:
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  test/CodeGenCXX/attr-used-member-function-implicit-instantiation.cpp


Index: test/CodeGenCXX/attr-used-member-function-implicit-instantiation.cpp
===================================================================
--- test/CodeGenCXX/attr-used-member-function-implicit-instantiation.cpp
+++ test/CodeGenCXX/attr-used-member-function-implicit-instantiation.cpp
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
+
+// Check that PR17480 is fixed: __attribute__((used)) ignored in templated
+// classes
+namespace InstantiateUsedMemberDefinition {
+template <typename T>
+struct S {
+  int __attribute__((used)) f() {
+    return 0;
+  }
+};
+
+void test() {
+  // Check that InstantiateUsedMemberDefinition::S<int>::f() is defined
+  // as a result of the S class template implicit instantiation
+  // CHECK: define linkonce_odr i32 @_ZN31InstantiateUsedMemberDefinition1SIiE1fEv
+  S<int> inst;
+}
+} // namespace InstantiateUsedMemberDefinition
Index: lib/Sema/SemaTemplateInstantiateDecl.cpp
===================================================================
--- lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -2175,6 +2175,20 @@
     Owner->addDecl(Method);
   }
 
+  // PR17480: Honor the used attribute to instantiate member function
+  // definitions
+  if (Method->hasAttr<UsedAttr>()) {
+    if (const auto *A = dyn_cast<CXXRecordDecl>(Owner)) {
+      SourceLocation Loc;
+      if (const MemberSpecializationInfo *MSInfo =
+              A->getMemberSpecializationInfo())
+        Loc = MSInfo->getPointOfInstantiation();
+      else if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(A))
+        Loc = Spec->getPointOfInstantiation();
+      SemaRef.MarkFunctionReferenced(Loc, Method);
+    }
+  }
+
   return Method;
 }
 


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D56928.184470.patch
Type: text/x-patch
Size: 1774 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20190131/9e7a7e3a/attachment.bin>