From: David Majnemer <david.majnemer@gmail.com>
Date: Sun, 7 Jul 2013 23:49:50 +0000 (+0000)
Subject: Sema: Do not merge new decls with invalid, old decls
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=bcd0650c1e50a2e73b11717731e074a1ac2ac5ba;p=clang

Sema: Do not merge new decls with invalid, old decls

Sema::MergeFunctionDecl attempts merging two decls even if the old decl
is invalid.  This can lead to interesting circumstances where we
successfully merge the decls but the result makes no sense.

Take the following for example:

template <typename T>
int main(void);

int main(void);

Sema will not consider these to be overloads of the same name because
main can't be overloaded, which means that this must be a redeclaration.

In this case the templated decl is compatible with the non-templated
decl allowing the Sema::CheckFunctionDeclaration machinery to move on
and do bizarre things like setting the previous decl of a non-templated
decl to a templated decl!

The way I see it, we should just bail from MergeFunctionDecl if the old
decl is invalid.

This fixes PR16531.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185779 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 2024acc975..5abacca732 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -2305,6 +2305,10 @@ bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) {
     return true;
   }
 
+  // If the old declaration is invalid, just give up here.
+  if (Old->isInvalidDecl())
+    return true;
+
   // Determine whether the previous declaration was a definition,
   // implicit declaration, or a declaration.
   diag::kind PrevDiag;
diff --git a/test/CXX/basic/basic.start/basic.start.main/p2.cpp b/test/CXX/basic/basic.start/basic.start.main/p2.cpp
index cd912b834d..5c7d60c1df 100644
--- a/test/CXX/basic/basic.start/basic.start.main/p2.cpp
+++ b/test/CXX/basic/basic.start/basic.start.main/p2.cpp
@@ -15,8 +15,8 @@
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST10
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST11
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST12
-// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST12
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST13
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST14
 
 #if TEST1
 
@@ -103,6 +103,13 @@ int main(void) {}
 template <typename T>
 int main(void); // expected-error{{'main' cannot be a template}}
 
+#elif TEST14
+
+template <typename T>
+int main(void); // expected-error{{'main' cannot be a template}}
+
+int main(void) {}
+
 #else
 
 #error Unknown test mode
diff --git a/test/Parser/DelayedTemplateParsing.cpp b/test/Parser/DelayedTemplateParsing.cpp
index 77b47239f4..3e429d4116 100644
--- a/test/Parser/DelayedTemplateParsing.cpp
+++ b/test/Parser/DelayedTemplateParsing.cpp
@@ -11,7 +11,8 @@ class A {
 template <class T>
 class B {
    void foo4() { } // expected-note {{previous definition is here}}  expected-note {{previous definition is here}}
-   void foo4() { } // expected-error {{class member cannot be redeclared}} expected-error {{redefinition of 'foo4'}}  expected-note {{previous definition is here}}
+   void foo4() { } // expected-error {{class member cannot be redeclared}} expected-error {{redefinition of 'foo4'}}
+   void foo5() { } // expected-note {{previous definition is here}}
 
    friend void foo3() {
        undeclared();
@@ -20,7 +21,7 @@ class B {
 
 
 template <class T>
-void B<T>::foo4() {// expected-error {{redefinition of 'foo4'}}
+void B<T>::foo5() { // expected-error {{redefinition of 'foo5'}}
 }
 
 template <class T>
diff --git a/test/Sema/warn-main.c b/test/Sema/warn-main.c
index b67f96125d..58a6dfde10 100644
--- a/test/Sema/warn-main.c
+++ b/test/Sema/warn-main.c
@@ -14,16 +14,14 @@ static int main() {
   return 0;
 }
 
-// expected-error@+3 {{redefinition of 'main'}}
-// expected-error@+2 {{'main' is not allowed to be declared inline}}
-// expected-note@+1 {{previous definition is here}}
+// expected-error@+2 {{redefinition of 'main'}}
+// expected-error@+1 {{'main' is not allowed to be declared inline}}
 inline int main() {
 // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:1-[[@LINE-1]]:8}:""
   return 0;
 }
 
-// expected-warning@+6 {{function 'main' declared 'noreturn' should not return}}
-// expected-error@+3 {{redefinition of 'main'}}
+// expected-warning@+5 {{function 'main' declared 'noreturn' should not return}}
 // expected-warning@+2 {{'main' is not allowed to be declared _Noreturn}}
 // expected-note@+1 {{remove '_Noreturn'}}
 _Noreturn int main() {
diff --git a/test/SemaTemplate/canonical-expr-type.cpp b/test/SemaTemplate/canonical-expr-type.cpp
index 7582df5e66..4770c4fa3e 100644
--- a/test/SemaTemplate/canonical-expr-type.cpp
+++ b/test/SemaTemplate/canonical-expr-type.cpp
@@ -22,14 +22,10 @@ void f0a(T x, __typeof__(f(N)) y) { } // expected-note{{previous}}
 void f(int);
 
 template<typename T, T N>
-void f0a(T x, __typeof__(f(N)) y) { } // expected-error{{redefinition}} \
-                                      // expected-note{{previous}}
+void f0a(T x, __typeof__(f(N)) y) { } // expected-error{{redefinition}}
 
 void f(float);
 
-template<typename T, T N>
-void f0a(T x, __typeof__(f(N)) y) { } // expected-error{{redefinition}}
-
 // Test dependently-sized array canonicalization
 template<typename T, int N, int M>
 void f1(T (&array)[N + M]) { } // expected-note{{previous}}