From 7ac0ff2a8791280102a557761dbb931deb21a1dc Mon Sep 17 00:00:00 2001
From: Fariborz Jahanian <fjahanian@apple.com>
Date: Fri, 21 Jan 2011 01:04:41 +0000
Subject: [PATCH] Move cheking of kext into
 canDevirtualizeMemberFunctionCalls(). Improve on test case. Per Doug's
 comment. wip.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@123954 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGExprCXX.cpp                  | 31 +++++++++++-----------
 test/CodeGenCXX/apple-kext-indirect-call.C |  3 +--
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/lib/CodeGen/CGExprCXX.cpp b/lib/CodeGen/CGExprCXX.cpp
index 08ff17e1fd..5521c0f8ce 100644
--- a/lib/CodeGen/CGExprCXX.cpp
+++ b/lib/CodeGen/CGExprCXX.cpp
@@ -55,9 +55,14 @@ RValue CodeGenFunction::EmitCXXMemberCall(const CXXMethodDecl *MD,
 
 /// canDevirtualizeMemberFunctionCalls - Checks whether virtual calls on given
 /// expr can be devirtualized.
-static bool canDevirtualizeMemberFunctionCalls(const Expr *Base, 
+static bool canDevirtualizeMemberFunctionCalls(ASTContext &Context,
+                                               const Expr *Base, 
                                                const CXXMethodDecl *MD) {
   
+  // Cannot divirtualize in kext mode.
+  if (Context.getLangOptions().AppleKext)
+    return false;
+
   // If the member function has the "final" attribute, we know that it can't be
   // overridden and can therefore devirtualize it.
   if (MD->hasAttr<FinalAttr>())
@@ -173,12 +178,9 @@ RValue CodeGenFunction::EmitCXXMemberCallExpr(const CXXMemberCallExpr *CE,
   // We also don't emit a virtual call if the base expression has a record type
   // because then we know what the type is.
   bool UseVirtualCall;
-  if (!getContext().getLangOptions().AppleKext)
-    UseVirtualCall = MD->isVirtual() && !ME->hasQualifier()
-                     && !canDevirtualizeMemberFunctionCalls(ME->getBase(), MD);
-  else
-    UseVirtualCall = MD->isVirtual();
-
+  UseVirtualCall = MD->isVirtual() && !ME->hasQualifier()
+                   && !canDevirtualizeMemberFunctionCalls(getContext(),
+                                                          ME->getBase(), MD);
   llvm::Value *Callee;
   if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(MD)) {
     if (UseVirtualCall) {
@@ -190,14 +192,13 @@ RValue CodeGenFunction::EmitCXXMemberCallExpr(const CXXMemberCallExpr *CE,
                dyn_cast<CXXConstructorDecl>(MD)) {
     Callee = CGM.GetAddrOfFunction(GlobalDecl(Ctor, Ctor_Complete), Ty);
   } else if (UseVirtualCall) {
-    if (getContext().getLangOptions().AppleKext &&
-        ME->hasQualifier()) {
-      Callee = BuildAppleKextVirtualCall(MD, ME->getQualifier(), This, Ty);
-    }
-    else
       Callee = BuildVirtualCall(MD, This, Ty); 
   } else {
-    Callee = CGM.GetAddrOfFunction(MD, Ty);
+    if (getContext().getLangOptions().AppleKext &&
+        ME->hasQualifier())
+      Callee = BuildAppleKextVirtualCall(MD, ME->getQualifier(), This, Ty);
+    else 
+      Callee = CGM.GetAddrOfFunction(MD, Ty);
   }
 
   return EmitCXXMemberCall(MD, Callee, ReturnValue, This, /*VTT=*/0,
@@ -277,8 +278,8 @@ CodeGenFunction::EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E,
                                    FPT->isVariadic());
   llvm::Value *Callee;
   if (MD->isVirtual() && 
-      (getContext().getLangOptions().AppleKext || 
-       !canDevirtualizeMemberFunctionCalls(E->getArg(0), MD)))
+      !canDevirtualizeMemberFunctionCalls(getContext(),
+                                           E->getArg(0), MD))
     Callee = BuildVirtualCall(MD, This, Ty);
   else
     Callee = CGM.GetAddrOfFunction(MD, Ty);
diff --git a/test/CodeGenCXX/apple-kext-indirect-call.C b/test/CodeGenCXX/apple-kext-indirect-call.C
index 401e743305..2dbb0b8395 100644
--- a/test/CodeGenCXX/apple-kext-indirect-call.C
+++ b/test/CodeGenCXX/apple-kext-indirect-call.C
@@ -1,8 +1,6 @@
 // RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fapple-kext -emit-llvm -o - %s | FileCheck %s
 
 struct Base { 
-  virtual void abc1(void) const; 
-  virtual void abc2(void) const; 
   virtual void abc(void) const; 
 };
 
@@ -12,4 +10,5 @@ void FUNC(Base* p) {
   p->Base::abc();
 }
 
+// CHECK: getelementptr inbounds (void (%struct.Base*)** bitcast ([3 x i8*]* @_ZTV4Base to void (%struct.Base*)**), i64 2)
 // CHECK-NOT: call void @_ZNK4Base3abcEv
-- 
2.40.0