[PATCH] D44988: [Sema] Fix decrement availability for built-in types

[Jan Korous via Phabricator via cfe-commits]

jkorous-apple created this revision.
jkorous-apple added reviewers: speziale.ettore, arphaman.
Herald added a subscriber: cfe-commits.

C++ [over.built]p4:

  For every pair (T, VQ), where T is an arithmetic type other than bool, and VQ is either volatile or empty, there exist candidate operator functions of the form
  
    VQ T&      operator--(VQ T&);
    T          operator--(VQ T&, int);

The bool type is in position LastPromotedIntegralType in BuiltinOperatorOverloadBuilder::getArithmeticType::ArithmeticTypes, but addPlusPlusMinusMinusArithmeticOverloads() is expecting it at position 0.

Original patch by Ettore Speziale.

rdar://problem/34255516


Repository:
  rC Clang

https://reviews.llvm.org/D44988

Files:
  lib/Sema/SemaOverload.cpp
  test/SemaCXX/overloaded-builtin-operators.cpp


Index: test/SemaCXX/overloaded-builtin-operators.cpp
===================================================================
--- test/SemaCXX/overloaded-builtin-operators.cpp
+++ test/SemaCXX/overloaded-builtin-operators.cpp
@@ -73,6 +73,10 @@
   operator volatile long&();
 };
 
+struct FloatRef {
+  operator float&();
+};
+
 struct XpmfRef { // expected-note{{candidate function (the implicit copy assignment operator) not viable}}
 #if __cplusplus >= 201103L // C++11 or later
 // expected-note at -2 {{candidate function (the implicit move assignment operator) not viable}}
@@ -84,13 +88,16 @@
   operator E2&();
 };
 
-void g(ShortRef sr, LongRef lr, E2Ref e2_ref, XpmfRef pmf_ref) {
+void g(ShortRef sr, LongRef lr, FloatRef fr, E2Ref e2_ref, XpmfRef pmf_ref) {
   // C++ [over.built]p3
   short s1 = sr++;
 
   // C++ [over.built]p3
   long l1 = lr--;
 
+  // C++ [over.built]p4
+  float f1 = fr--;
+
   // C++ [over.built]p18
   short& sr1 = (sr *= lr);
   volatile long& lr1 = (lr *= sr);
Index: lib/Sema/SemaOverload.cpp
===================================================================
--- lib/Sema/SemaOverload.cpp
+++ lib/Sema/SemaOverload.cpp
@@ -7796,10 +7796,12 @@
     if (!HasArithmeticOrEnumeralCandidateType)
       return;
 
-    for (unsigned Arith = (Op == OO_PlusPlus? 0 : 1);
-         Arith < NumArithmeticTypes; ++Arith) {
+    for (unsigned Arith = 0; Arith < NumArithmeticTypes; ++Arith) {
+      const auto TypeOfT = ArithmeticTypes[Arith];
+      if (Op == OO_MinusMinus && TypeOfT == S.Context.BoolTy)
+        continue;
       addPlusPlusMinusMinusStyleOverloads(
-        ArithmeticTypes[Arith],
+        TypeOfT,
         VisibleTypeConversionsQuals.hasVolatile(),
         VisibleTypeConversionsQuals.hasRestrict());
     }


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