Use back() instead of [size()-1].

[oota-llvm.git] / lib / VMCore / Globals.cpp

diff --git a/lib/VMCore/Globals.cpp b/lib/VMCore/Globals.cpp
index 0155915146a638424039b44a57cd507869066254..7340f1532f536c4278df179316f968437b123188 100644 (file)
--- a/lib/VMCore/Globals.cpp
+++ b/lib/VMCore/Globals.cpp
@@ -2,8 +2,8 @@
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
@@ -17,6 +17,7 @@
 #include "llvm/GlobalAlias.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/Module.h"
+#include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/LeakDetector.h"
 using namespace llvm;
 
@@ -78,7 +79,16 @@ void GlobalValue::destroyConstant() {
   assert(0 && "You can't GV->destroyConstant()!");
   abort();
 }
-  
+
+/// copyAttributesFrom - copy all additional attributes (those not needed to
+/// create a GlobalValue) from the GlobalValue Src to this one.
+void GlobalValue::copyAttributesFrom(const GlobalValue *Src) {
+  setAlignment(Src->getAlignment());
+  setSection(Src->getSection());
+  setVisibility(Src->getVisibility());
+}
+
+
 //===----------------------------------------------------------------------===//
 // GlobalVariable Implementation
 //===----------------------------------------------------------------------===//
@@ -88,14 +98,13 @@ GlobalVariable::GlobalVariable(const Type *Ty, bool constant, LinkageTypes Link,
                                Module *ParentModule, bool ThreadLocal, 
                                unsigned AddressSpace)
   : GlobalValue(PointerType::get(Ty, AddressSpace), Value::GlobalVariableVal,
-                &Initializer, InitVal != 0, Link, Name),
+                OperandTraits<GlobalVariable>::op_begin(this),
+                InitVal != 0, Link, Name),
     isConstantGlobal(constant), isThreadLocalSymbol(ThreadLocal) {
   if (InitVal) {
     assert(InitVal->getType() == Ty &&
            "Initializer should be the same type as the GlobalVariable!");
-    Initializer.init(InitVal, this);
-  } else {
-    Initializer.init(0, this);
+    Op<0>() = InitVal;
   }
 
   LeakDetector::addGarbageObject(this);
@@ -109,14 +118,13 @@ GlobalVariable::GlobalVariable(const Type *Ty, bool constant, LinkageTypes Link,
                                GlobalVariable *Before, bool ThreadLocal,
                                unsigned AddressSpace)
   : GlobalValue(PointerType::get(Ty, AddressSpace), Value::GlobalVariableVal,
-                &Initializer, InitVal != 0, Link, Name), 
+                OperandTraits<GlobalVariable>::op_begin(this),
+                InitVal != 0, Link, Name),
     isConstantGlobal(constant), isThreadLocalSymbol(ThreadLocal) {
   if (InitVal) {
     assert(InitVal->getType() == Ty &&
            "Initializer should be the same type as the GlobalVariable!");
-    Initializer.init(InitVal, this);
-  } else {
-    Initializer.init(0, this);
+    Op<0>() = InitVal;
   }
   
   LeakDetector::addGarbageObject(this);
@@ -161,6 +169,16 @@ void GlobalVariable::replaceUsesOfWithOnConstant(Value *From, Value *To,
   this->setOperand(0, cast<Constant>(To));
 }
 
+/// copyAttributesFrom - copy all additional attributes (those not needed to
+/// create a GlobalVariable) from the GlobalVariable Src to this one.
+void GlobalVariable::copyAttributesFrom(const GlobalValue *Src) {
+  assert(isa<GlobalVariable>(Src) && "Expected a GlobalVariable!");
+  GlobalValue::copyAttributesFrom(Src);
+  const GlobalVariable *SrcVar = cast<GlobalVariable>(Src);
+  setThreadLocal(SrcVar->isThreadLocal());
+}
+
+
 //===----------------------------------------------------------------------===//
 // GlobalAlias Implementation
 //===----------------------------------------------------------------------===//
@@ -168,12 +186,12 @@ void GlobalVariable::replaceUsesOfWithOnConstant(Value *From, Value *To,
 GlobalAlias::GlobalAlias(const Type *Ty, LinkageTypes Link,
                          const std::string &Name, Constant* aliasee,
                          Module *ParentModule)
-  : GlobalValue(Ty, Value::GlobalAliasVal, &Aliasee, 1, Link, Name) {
+  : GlobalValue(Ty, Value::GlobalAliasVal, &Op<0>(), 1, Link, Name) {
   LeakDetector::addGarbageObject(this);
 
   if (aliasee)
     assert(aliasee->getType() == Ty && "Alias and aliasee types should match!");
-  Aliasee.init(aliasee, this);
+  Op<0>() = aliasee;
 
   if (ParentModule)
     ParentModule->getAliasList().push_back(this);
@@ -230,3 +248,18 @@ const GlobalValue *GlobalAlias::getAliasedGlobal() const {
   return 0;
 }
 
+const GlobalValue *GlobalAlias::resolveAliasedGlobal() const {
+  SmallPtrSet<const GlobalValue*, 3> Visited;
+
+  const GlobalValue *GV = getAliasedGlobal();
+  Visited.insert(GV);
+
+  while (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) {
+    GV = GA->getAliasedGlobal();
+
+    if (!Visited.insert(GV))
+      return NULL;
+  }
+
+  return GV;
+}