r188112 - Fix for PR16570: when comparing two function pointers, discard qualifiers when

[Richard Trieu]

Author: rtrieu
Date: Fri Aug  9 16:42:32 2013
New Revision: 188112

URL: http://llvm.org/viewvc/llvm-project?rev=188112&view=rev
Log:
Fix for PR16570: when comparing two function pointers, discard qualifiers when
comparing non-reference function parameters.  The qualifiers don't matter for
comparisons.

This is a re-commit of r187769, which was accidentially reverted in r187770,
with a simplification at the suggestion of Eli Friedman.

Added:
    cfe/trunk/test/SemaCXX/function-pointer-arguments.cpp
Modified:
    cfe/trunk/lib/Sema/SemaOverload.cpp

Modified: cfe/trunk/lib/Sema/SemaOverload.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaOverload.cpp?rev=188112&r1=188111&r2=188112&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaOverload.cpp (original)
+++ cfe/trunk/lib/Sema/SemaOverload.cpp Fri Aug  9 16:42:32 2013
@@ -2584,7 +2584,8 @@ bool Sema::FunctionArgTypesAreEqual(cons
   for (FunctionProtoType::arg_type_iterator O = OldType->arg_type_begin(),
        N = NewType->arg_type_begin(),
        E = OldType->arg_type_end(); O && (O != E); ++O, ++N) {
-    if (!Context.hasSameType(*O, *N)) {
+    if (!Context.hasSameType(O->getUnqualifiedType(),
+                             N->getUnqualifiedType())) {
       if (ArgPos) *ArgPos = O - OldType->arg_type_begin();
       return false;
     }

Added: cfe/trunk/test/SemaCXX/function-pointer-arguments.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/function-pointer-arguments.cpp?rev=188112&view=auto
==============================================================================
--- cfe/trunk/test/SemaCXX/function-pointer-arguments.cpp (added)
+++ cfe/trunk/test/SemaCXX/function-pointer-arguments.cpp Fri Aug  9 16:42:32 2013
@@ -0,0 +1,52 @@
+//RUN: %clang_cc1 -fsyntax-only -verify %s
+
+namespace PR16570 {
+  int f1(int, int);
+  int f2(const int, int);
+  int f3(int&, int);
+  int f4(const int&, int);
+
+  void good() {
+    int(*g1)(int, int) = f1;
+    int(*g2)(const int, int) = f1;
+    int(*g3)(volatile int, int) = f1;
+    int(*g4)(int, int) = f2;
+    int(*g5)(const int, int) = f2;
+    int(*g6)(volatile int, int) = f2;
+    int(*g7)(int&, int) = f3;
+    int(*g8)(const int&, int) = f4;
+  }
+
+  void bad() {
+    void (*g1)(int, int) = f1;
+    // expected-error at -1 {{different return type ('void' vs 'int'}}
+    const int (*g2)(int, int) = f1;
+    // expected-error at -1 {{different return type ('const int' vs 'int')}}
+
+    int (*g3)(char, int) = f1;
+    // expected-error at -1 {{type mismatch at 1st parameter ('char' vs 'int')}}
+    int (*g4)(int, char) = f1;
+    // expected-error at -1 {{type mismatch at 2nd parameter ('char' vs 'int')}}
+
+    int (*g5)(int) = f1;
+    // expected-error at -1 {{different number of parameters (1 vs 2)}}
+
+    int (*g6)(int, int, int) = f1;
+    // expected-error at -1 {{different number of parameters (3 vs 2)}}
+
+    int (*g7)(const int, char) = f1;
+    // expected-error at -1 {{type mismatch at 2nd parameter ('char' vs 'int')}}
+    int (*g8)(int, char) = f2;
+    // expected-error at -1 {{type mismatch at 2nd parameter ('char' vs 'int')}}
+    int (*g9)(const int&, char) = f3;
+    // expected-error at -1 {{type mismatch at 1st parameter ('const int &' vs 'int &')}}
+    int (*g10)(int&, char) = f4;
+    // expected-error at -1 {{type mismatch at 1st parameter ('int &' vs 'const int &')}}
+  }
+
+  typedef void (*F)(const char * __restrict__, int);
+  void g(const char *, unsigned);
+  F f = g;
+  // expected-error at -1 {{type mismatch at 2nd parameter ('int' vs 'unsigned int')}}
+
+}