1 files changed, 264 insertions, 0 deletions
diff --git a/lib/IR/Globals.cpp b/lib/IR/Globals.cpp
new file mode 100644
index 0000000000..f21cdcce23
--- /dev/null
+++ b/lib/IR/Globals.cpp
@@ -0,0 +1,264 @@
+//===-- Globals.cpp - Implement the GlobalValue & GlobalVariable class ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the GlobalValue & GlobalVariable classes for the IR
+// library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/GlobalValue.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/GlobalAlias.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/Module.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/LeakDetector.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+//                            GlobalValue Class
+//===----------------------------------------------------------------------===//
+
+bool GlobalValue::isMaterializable() const {
+  return getParent() && getParent()->isMaterializable(this);
+}
+bool GlobalValue::isDematerializable() const {
+  return getParent() && getParent()->isDematerializable(this);
+}
+bool GlobalValue::Materialize(std::string *ErrInfo) {
+  return getParent()->Materialize(this, ErrInfo);
+}
+void GlobalValue::Dematerialize() {
+  getParent()->Dematerialize(this);
+}
+
+/// Override destroyConstant to make sure it doesn't get called on
+/// GlobalValue's because they shouldn't be treated like other constants.
+void GlobalValue::destroyConstant() {
+  llvm_unreachable("You can't GV->destroyConstant()!");
+}
+
+/// 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());
+  setUnnamedAddr(Src->hasUnnamedAddr());
+}
+
+void GlobalValue::setAlignment(unsigned Align) {
+  assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
+  assert(Align <= MaximumAlignment &&
+         "Alignment is greater than MaximumAlignment!");
+  Alignment = Log2_32(Align) + 1;
+  assert(getAlignment() == Align && "Alignment representation error!");
+}
+
+bool GlobalValue::isDeclaration() const {
+  // Globals are definitions if they have an initializer.
+  if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(this))
+    return GV->getNumOperands() == 0;
+
+  // Functions are definitions if they have a body.
+  if (const Function *F = dyn_cast<Function>(this))
+    return F->empty();
+
+  // Aliases are always definitions.
+  assert(isa<GlobalAlias>(this));
+  return false;
+}
+  
+//===----------------------------------------------------------------------===//
+// GlobalVariable Implementation
+//===----------------------------------------------------------------------===//
+
+GlobalVariable::GlobalVariable(Type *Ty, bool constant, LinkageTypes Link,
+                               Constant *InitVal, const Twine &Name,
+                               ThreadLocalMode TLMode, unsigned AddressSpace)
+  : GlobalValue(PointerType::get(Ty, AddressSpace),
+                Value::GlobalVariableVal,
+                OperandTraits<GlobalVariable>::op_begin(this),
+                InitVal != 0, Link, Name),
+    isConstantGlobal(constant), threadLocalMode(TLMode) {
+  if (InitVal) {
+    assert(InitVal->getType() == Ty &&
+           "Initializer should be the same type as the GlobalVariable!");
+    Op<0>() = InitVal;
+  }
+
+  LeakDetector::addGarbageObject(this);
+}
+
+GlobalVariable::GlobalVariable(Module &M, Type *Ty, bool constant,
+                               LinkageTypes Link, Constant *InitVal,
+                               const Twine &Name,
+                               GlobalVariable *Before, ThreadLocalMode TLMode,
+                               unsigned AddressSpace)
+  : GlobalValue(PointerType::get(Ty, AddressSpace),
+                Value::GlobalVariableVal,
+                OperandTraits<GlobalVariable>::op_begin(this),
+                InitVal != 0, Link, Name),
+    isConstantGlobal(constant), threadLocalMode(TLMode) {
+  if (InitVal) {
+    assert(InitVal->getType() == Ty &&
+           "Initializer should be the same type as the GlobalVariable!");
+    Op<0>() = InitVal;
+  }
+  
+  LeakDetector::addGarbageObject(this);
+  
+  if (Before)
+    Before->getParent()->getGlobalList().insert(Before, this);
+  else
+    M.getGlobalList().push_back(this);
+}
+
+void GlobalVariable::setParent(Module *parent) {
+  if (getParent())
+    LeakDetector::addGarbageObject(this);
+  Parent = parent;
+  if (getParent())
+    LeakDetector::removeGarbageObject(this);
+}
+
+void GlobalVariable::removeFromParent() {
+  getParent()->getGlobalList().remove(this);
+}
+
+void GlobalVariable::eraseFromParent() {
+  getParent()->getGlobalList().erase(this);
+}
+
+void GlobalVariable::replaceUsesOfWithOnConstant(Value *From, Value *To,
+                                                 Use *U) {
+  // If you call this, then you better know this GVar has a constant
+  // initializer worth replacing. Enforce that here.
+  assert(getNumOperands() == 1 &&
+         "Attempt to replace uses of Constants on a GVar with no initializer");
+
+  // And, since you know it has an initializer, the From value better be
+  // the initializer :)
+  assert(getOperand(0) == From &&
+         "Attempt to replace wrong constant initializer in GVar");
+
+  // And, you better have a constant for the replacement value
+  assert(isa<Constant>(To) &&
+         "Attempt to replace GVar initializer with non-constant");
+
+  // Okay, preconditions out of the way, replace the constant initializer.
+  this->setOperand(0, cast<Constant>(To));
+}
+
+void GlobalVariable::setInitializer(Constant *InitVal) {
+  if (InitVal == 0) {
+    if (hasInitializer()) {
+      Op<0>().set(0);
+      NumOperands = 0;
+    }
+  } else {
+    assert(InitVal->getType() == getType()->getElementType() &&
+           "Initializer type must match GlobalVariable type");
+    if (!hasInitializer())
+      NumOperands = 1;
+    Op<0>().set(InitVal);
+  }
+}
+
+/// 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
+//===----------------------------------------------------------------------===//
+
+GlobalAlias::GlobalAlias(Type *Ty, LinkageTypes Link,
+                         const Twine &Name, Constant* aliasee,
+                         Module *ParentModule)
+  : GlobalValue(Ty, Value::GlobalAliasVal, &Op<0>(), 1, Link, Name) {
+  LeakDetector::addGarbageObject(this);
+
+  if (aliasee)
+    assert(aliasee->getType() == Ty && "Alias and aliasee types should match!");
+  Op<0>() = aliasee;
+
+  if (ParentModule)
+    ParentModule->getAliasList().push_back(this);
+}
+
+void GlobalAlias::setParent(Module *parent) {
+  if (getParent())
+    LeakDetector::addGarbageObject(this);
+  Parent = parent;
+  if (getParent())
+    LeakDetector::removeGarbageObject(this);
+}
+
+void GlobalAlias::removeFromParent() {
+  getParent()->getAliasList().remove(this);
+}
+
+void GlobalAlias::eraseFromParent() {
+  getParent()->getAliasList().erase(this);
+}
+
+void GlobalAlias::setAliasee(Constant *Aliasee) {
+  assert((!Aliasee || Aliasee->getType() == getType()) &&
+         "Alias and aliasee types should match!");
+  
+  setOperand(0, Aliasee);
+}
+
+const GlobalValue *GlobalAlias::getAliasedGlobal() const {
+  const Constant *C = getAliasee();
+  if (C == 0) return 0;
+  
+  if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
+    return GV;
+
+  const ConstantExpr *CE = cast<ConstantExpr>(C);
+  assert((CE->getOpcode() == Instruction::BitCast || 
+          CE->getOpcode() == Instruction::GetElementPtr) &&
+         "Unsupported aliasee");
+  
+  return cast<GlobalValue>(CE->getOperand(0));
+}
+
+const GlobalValue *GlobalAlias::resolveAliasedGlobal(bool stopOnWeak) const {
+  SmallPtrSet<const GlobalValue*, 3> Visited;
+
+  // Check if we need to stop early.
+  if (stopOnWeak && mayBeOverridden())
+    return this;
+
+  const GlobalValue *GV = getAliasedGlobal();
+  Visited.insert(GV);
+
+  // Iterate over aliasing chain, stopping on weak alias if necessary.
+  while (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) {
+    if (stopOnWeak && GA->mayBeOverridden())
+      break;
+
+    GV = GA->getAliasedGlobal();
+
+    if (!Visited.insert(GV))
+      return 0;
+  }
+
+  return GV;
+}