[IFUNC] Introduce GlobalIndirectSymbol as a base class for alias and ifunc

This patch is a part of http://reviews.llvm.org/D15525

GlobalIndirectSymbol class contains common implementation for both
aliases and ifuncs. This patch should be NFC change that just prepare
common code for ifunc support.

Differential Revision: http://reviews.llvm.org/D18433

llvm-svn: 265016

1 files changed, 15 insertions, 5 deletions

diff --git a/llvm/lib/IR/Globals.cpp b/llvm/lib/IR/Globals.cpp
index c96cc6733af..47827fb9999 100644
--- a/llvm/lib/IR/Globals.cpp
+++ b/llvm/lib/IR/Globals.cpp
@@ -294,16 +294,26 @@ void GlobalVariable::copyAttributesFrom(const GlobalValue *Src) {
 
 
 //===----------------------------------------------------------------------===//
+// GlobalIndirectSymbol Implementation
+//===----------------------------------------------------------------------===//
+
+GlobalIndirectSymbol::GlobalIndirectSymbol(Type *Ty, ValueTy VTy,
+    unsigned AddressSpace, LinkageTypes Linkage, const Twine &Name,
+    Constant *Symbol)
+    : GlobalValue(Ty, VTy, &Op<0>(), 1, Linkage, Name, AddressSpace) {
+    Op<0>() = Symbol;
+}
+
+
+//===----------------------------------------------------------------------===//
 // GlobalAlias Implementation
 //===----------------------------------------------------------------------===//
 
 GlobalAlias::GlobalAlias(Type *Ty, unsigned AddressSpace, LinkageTypes Link,
                          const Twine &Name, Constant *Aliasee,
                          Module *ParentModule)
-    : GlobalValue(Ty, Value::GlobalAliasVal, &Op<0>(), 1, Link, Name,
-                  AddressSpace) {
-  Op<0>() = Aliasee;
-
+    : GlobalIndirectSymbol(Ty, Value::GlobalAliasVal, AddressSpace, Link, Name,
+                           Aliasee) {
   if (ParentModule)
     ParentModule->getAliasList().push_back(this);
 }
@@ -352,5 +362,5 @@ void GlobalAlias::eraseFromParent() {
 void GlobalAlias::setAliasee(Constant *Aliasee) {
   assert((!Aliasee || Aliasee->getType() == getType()) &&
          "Alias and aliasee types should match!");
-  setOperand(0, Aliasee);
+  setIndirectSymbol(Aliasee);
 }