[clang][APINotes] Do not add duplicate lifetimebound annotations (#117194)

In case a method already is lifetimebound annotated we should not add a
second annotation to the type.

clang/lib/Sema/CheckExprLifetime.cpp

@@ -498,7 +498,7 @@ static bool isNormalAssignmentOperator(const FunctionDecl *FD) {
   return false;
 }
 
-static bool implicitObjectParamIsLifetimeBound(const FunctionDecl *FD) {
+bool implicitObjectParamIsLifetimeBound(const FunctionDecl *FD) {
   const TypeSourceInfo *TSI = FD->getTypeSourceInfo();
   if (!TSI)
     return false;

clang/lib/Sema/CheckExprLifetime.h

@@ -57,6 +57,8 @@ void checkCaptureByLifetime(Sema &SemaRef, const CapturingEntity &Entity,
 void checkExprLifetimeMustTailArg(Sema &SemaRef,
                                   const InitializedEntity &Entity, Expr *Init);
 
+bool implicitObjectParamIsLifetimeBound(const FunctionDecl *FD);
+
 } // namespace clang::sema
 
 #endif // LLVM_CLANG_SEMA_CHECK_EXPR_LIFETIME_H

clang/lib/Sema/SemaAPINotes.cpp

@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "CheckExprLifetime.h"
 #include "TypeLocBuilder.h"
 #include "clang/APINotes/APINotesReader.h"
 #include "clang/AST/Decl.h"
@@ -568,7 +569,8 @@ static void ProcessAPINotes(Sema &S, FunctionOrMethod AnyFunc,
 static void ProcessAPINotes(Sema &S, CXXMethodDecl *Method,
                             const api_notes::CXXMethodInfo &Info,
                             VersionedInfoMetadata Metadata) {
-  if (Info.This && Info.This->isLifetimebound()) {
+  if (Info.This && Info.This->isLifetimebound() &&
+      !sema::implicitObjectParamIsLifetimeBound(Method)) {
     auto MethodType = Method->getType();
     auto *attr = ::new (S.Context)
         LifetimeBoundAttr(S.Context, getPlaceholderAttrInfo());

clang/test/APINotes/Inputs/Headers/Lifetimebound.apinotes

@@ -12,6 +12,10 @@ Tags:
       Parameters:
         - Position:      -1
           Lifetimebound: true
+    - Name: annotateThis2
+      Parameters:
+        - Position:      -1
+          Lifetimebound: true
     - Name: methodToAnnotate
       Parameters:
         - Position:      0

clang/test/APINotes/Inputs/Headers/Lifetimebound.h

@@ -3,5 +3,6 @@ int *funcToAnnotate(int *p);
 struct MyClass {
     MyClass(int*);
     int *annotateThis();
+    int *annotateThis2() [[clang::lifetimebound]];
     int *methodToAnnotate(int *p);
 };

clang/test/APINotes/lifetimebound.cpp

@@ -14,3 +14,4 @@
 // CHECK-METHOD-NEXT: LifetimeBoundAttr
 
 // CHECK-METHOD-THIS: CXXMethodDecl {{.+}} annotateThis 'int *() {{\[\[}}clang::lifetimebound{{\]\]}}'
+// CHECK-METHOD-THIS: CXXMethodDecl {{.+}} annotateThis2 'int *() {{\[\[}}clang::lifetimebound{{\]\]}}'