Patch for AST representation for the implicit conversion to a function

reference/pointer. And a test case for code gen.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83000 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaOverload.cpp

@@ -4883,12 +4883,18 @@ Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Object,
     // We selected one of the surrogate functions that converts the
     // object parameter to a function pointer. Perform the conversion
     // on the object argument, then let ActOnCallExpr finish the job.
-    // FIXME: Represent the user-defined conversion in the AST!
-    ImpCastExprToType(Object,
-                      Conv->getConversionType().getNonReferenceType(),
-                      CastExpr::CK_Unknown,
-                      Conv->getConversionType()->isLValueReferenceType());
-    return ActOnCallExpr(S, ExprArg(*this, Object), LParenLoc,
+    
+    // Create an implicit member expr to refer to the conversion operator.
+    MemberExpr *ME = 
+      new (Context) MemberExpr(Object, /*IsArrow=*/false, Conv, 
+                               SourceLocation(), Conv->getType());
+    QualType ResultType = Conv->getConversionType().getNonReferenceType();
+    CXXMemberCallExpr *CE =
+      new (Context) CXXMemberCallExpr(Context, ME, 0, 0, 
+                                      ResultType,
+                                      SourceLocation());
+    
+    return ActOnCallExpr(S, ExprArg(*this, CE), LParenLoc,
                          MultiExprArg(*this, (ExprTy**)Args, NumArgs),
                          CommaLocs, RParenLoc).release();
   }

test/CodeGenCXX/convert-to-fptr.cpp

@@ -0,0 +1,47 @@
+// RUN: clang-cc -triple x86_64-apple-darwin -std=c++0x -S %s -o %t-64.s &&
+// RUN: FileCheck -check-prefix LP64 --input-file=%t-64.s %s &&
+// RUN: clang-cc -triple i386-apple-darwin -std=c++0x -S %s -o %t-32.s &&
+// RUN: FileCheck -check-prefix LP32 --input-file=%t-32.s %s &&
+// RUN: true
+
+extern "C" int printf(...);
+
+int f1(int arg)  { return arg; }; 
+
+int f2(float arg) { return int(arg); }; 
+
+typedef int (*fp1)(int); 
+
+typedef int (*fp2)(float); 
+
+struct A {
+  operator fp1() { return f1; }
+  operator fp2() { return f2; } 
+} a;
+
+
+// Test for function reference.
+typedef int (&fr1)(int); 
+typedef int (&fr2)(float); 
+
+struct B {
+  operator fr1() { return f1; }
+  operator fr2() { return f2; } 
+} b;
+
+int main()
+{
+ int i = a(10); // Calls f1 via pointer returned from conversion function
+ printf("i = %d\n", i);
+
+ int j = b(20); // Calls f1 via pointer returned from conversion function
+ printf("j = %d\n", j);
+ return 0;
+}
+
+// CHECK-LP64: call __ZN1AcvPFiiEEv
+// CHECK-LP64: call __ZN1BcvRFiiEEv
+
+// CHECK-LP32: call L__ZN1AcvPFiiEEv
+// CHECK-LP32: call L__ZN1BcvRFiiEEv
+

www/cxx_status.html

@@ -1605,7 +1605,6 @@ welcome!</p>
   <td class="medium" align="center"></td>
   <td class="advanced" align="center"></td>
   <td class="na" align="center">N/A</td>  
-  <td>Missing AST representation for the implicit conversion to a function reference/pointer</td>
 </tr>
 <tr>
   <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;13.3.1.2 [over.match.oper]</td>