From: Serge Pavlov <sepavloff@gmail.com>
Date: Wed, 21 Jun 2017 12:46:57 +0000 (+0000)
Subject: Function with unparsed body is a definition
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=cabb95e0814719bf953eeeda569e6abafa5fbfad;p=clang

Function with unparsed body is a definition

While a function body is being parsed, the function declaration is not considered
as a definition because it does not have a body yet. In some cases it leads to
incorrect interpretation, the case is presented in
https://bugs.llvm.org/show_bug.cgi?id=14785:
```
    template<typename T> struct Somewhat {
      void internal() const {}
      friend void operator+(int const &, Somewhat<T> const &) {}
    };
void operator+(int const &, Somewhat<char> const &x) { x.internal(); }
```
When statement `x.internal()` in the body of global `operator+` is parsed, the type
of `x` must be completed, so the instantiation of `Somewhat<char>` is started. It
instantiates the declaration of `operator+` defined inline, and makes a check for
redefinition. The check does not detect another definition because the declaration
of `operator+` is still not defining as does not have a body yet.

To solves this problem the function `isThisDeclarationADefinition` considers
a function declaration as a definition if it has flag `WillHaveBody` set.

This change fixes PR14785.

Differential Revision: https://reviews.llvm.org/D30375

This is a recommit of 305379, reverted in 305381, with small changes.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@305903 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/AST/Decl.h b/include/clang/AST/Decl.h
index b15c9d3f1e..30552be9b3 100644
--- a/include/clang/AST/Decl.h
+++ b/include/clang/AST/Decl.h
@@ -1874,7 +1874,7 @@ public:
   ///
   bool isThisDeclarationADefinition() const {
     return IsDeleted || IsDefaulted || Body || IsLateTemplateParsed ||
-      hasDefiningAttr();
+      WillHaveBody || hasDefiningAttr();
   }
 
   /// doesThisDeclarationHaveABody - Returns whether this specific
diff --git a/lib/Sema/SemaCUDA.cpp b/lib/Sema/SemaCUDA.cpp
index b938ac387c..cac5f68227 100644
--- a/lib/Sema/SemaCUDA.cpp
+++ b/lib/Sema/SemaCUDA.cpp
@@ -629,12 +629,6 @@ static bool IsKnownEmitted(Sema &S, FunctionDecl *FD) {
   // emitted, because (say) the definition could include "inline".
   FunctionDecl *Def = FD->getDefinition();
 
-  // We may currently be parsing the body of FD, in which case
-  // FD->getDefinition() will be null, but we still want to treat FD as though
-  // it's a definition.
-  if (!Def && FD->willHaveBody())
-    Def = FD;
-
   if (Def &&
       !isDiscardableGVALinkage(S.getASTContext().GetGVALinkageForFunction(Def)))
     return true;
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index d6164b3ff5..2f78d06a82 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -12232,6 +12232,7 @@ Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
 
   if (FD) {
     FD->setBody(Body);
+    FD->setWillHaveBody(false);
 
     if (getLangOpts().CPlusPlus14) {
       if (!FD->isInvalidDecl() && Body && !FD->isDependentContext() &&
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index 844299bb87..0b46e15bb0 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -13878,6 +13878,9 @@ void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
     return;
   }
 
+  // Deleted function does not have a body.
+  Fn->setWillHaveBody(false);
+
   if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
     // Don't consider the implicit declaration we generate for explicit
     // specializations. FIXME: Do not generate these implicit declarations.
diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index c58122cd27..479760222d 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -1782,6 +1782,9 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D,
       Previous.clear();
   }
 
+  if (isFriend)
+    Function->setObjectOfFriendDecl();
+
   SemaRef.CheckFunctionDeclaration(/*Scope*/ nullptr, Function, Previous,
                                    isExplicitSpecialization);
 
diff --git a/test/SemaCXX/friend2.cpp b/test/SemaCXX/friend2.cpp
index 347af0d61b..d1d4b628ba 100644
--- a/test/SemaCXX/friend2.cpp
+++ b/test/SemaCXX/friend2.cpp
@@ -170,3 +170,40 @@ struct Test {
 template class Test<int>;
 
 }
+
+namespace pr14785 {
+template<typename T>
+struct Somewhat {
+  void internal() const { }
+  friend void operator+(int const &, Somewhat<T> const &) {}  // expected-error{{redefinition of 'operator+'}}
+};
+
+void operator+(int const &, Somewhat<char> const &x) {  // expected-note {{previous definition is here}}
+  x.internal();  // expected-note{{in instantiation of template class 'pr14785::Somewhat<char>' requested here}}
+}
+}
+
+namespace D30375 {
+template <typename K> struct B {
+  template <typename A> bool insert(A &);
+};
+
+template <typename K>
+template <typename A> bool B<K>::insert(A &x) { return x < x; }
+
+template <typename K> class D {
+  B<K> t;
+
+public:
+  K x;
+  bool insert() { return t.insert(x); }
+  template <typename K1> friend bool operator<(const D<K1> &, const D<K1> &);
+};
+
+template <typename K> bool operator<(const D<K> &, const D<K> &);
+
+void func() {
+  D<D<int>> cache;
+  cache.insert();
+}
+}