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+//===-- 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/IR/GlobalValue.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/GlobalAlias.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Operator.h"
+#include "llvm/Support/ErrorHandling.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// GlobalValue Class
+//===----------------------------------------------------------------------===//
+
+bool GlobalValue::isMaterializable() const {
+ if (const Function *F = dyn_cast<Function>(this))
+ return F->isMaterializable();
+ return false;
+}
+std::error_code GlobalValue::materialize() {
+ return getParent()->materialize(this);
+}
+
+/// Override destroyConstantImpl to make sure it doesn't get called on
+/// GlobalValue's because they shouldn't be treated like other constants.
+void GlobalValue::destroyConstantImpl() {
+ llvm_unreachable("You can't GV->destroyConstantImpl()!");
+}
+
+Value *GlobalValue::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
+ llvm_unreachable("Unsupported class for handleOperandChange()!");
+}
+
+/// 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) {
+ setVisibility(Src->getVisibility());
+ setUnnamedAddr(Src->hasUnnamedAddr());
+ setDLLStorageClass(Src->getDLLStorageClass());
+}
+
+unsigned GlobalValue::getAlignment() const {
+ if (auto *GA = dyn_cast<GlobalAlias>(this)) {
+ // In general we cannot compute this at the IR level, but we try.
+ if (const GlobalObject *GO = GA->getBaseObject())
+ return GO->getAlignment();
+
+ // FIXME: we should also be able to handle:
+ // Alias = Global + Offset
+ // Alias = Absolute
+ return 0;
+ }
+ return cast<GlobalObject>(this)->getAlignment();
+}
+
+void GlobalObject::setAlignment(unsigned Align) {
+ assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
+ assert(Align <= MaximumAlignment &&
+ "Alignment is greater than MaximumAlignment!");
+ unsigned AlignmentData = Log2_32(Align) + 1;
+ unsigned OldData = getGlobalValueSubClassData();
+ setGlobalValueSubClassData((OldData & ~AlignmentMask) | AlignmentData);
+ assert(getAlignment() == Align && "Alignment representation error!");
+}
+
+unsigned GlobalObject::getGlobalObjectSubClassData() const {
+ unsigned ValueData = getGlobalValueSubClassData();
+ return ValueData >> AlignmentBits;
+}
+
+void GlobalObject::setGlobalObjectSubClassData(unsigned Val) {
+ unsigned OldData = getGlobalValueSubClassData();
+ setGlobalValueSubClassData((OldData & AlignmentMask) |
+ (Val << AlignmentBits));
+ assert(getGlobalObjectSubClassData() == Val && "representation error");
+}
+
+void GlobalObject::copyAttributesFrom(const GlobalValue *Src) {
+ GlobalValue::copyAttributesFrom(Src);
+ if (const auto *GV = dyn_cast<GlobalObject>(Src)) {
+ setAlignment(GV->getAlignment());
+ setSection(GV->getSection());
+ }
+}
+
+const char *GlobalValue::getSection() const {
+ if (auto *GA = dyn_cast<GlobalAlias>(this)) {
+ // In general we cannot compute this at the IR level, but we try.
+ if (const GlobalObject *GO = GA->getBaseObject())
+ return GO->getSection();
+ return "";
+ }
+ return cast<GlobalObject>(this)->getSection();
+}
+
+Comdat *GlobalValue::getComdat() {
+ if (auto *GA = dyn_cast<GlobalAlias>(this)) {
+ // In general we cannot compute this at the IR level, but we try.
+ if (const GlobalObject *GO = GA->getBaseObject())
+ return const_cast<GlobalObject *>(GO)->getComdat();
+ return nullptr;
+ }
+ return cast<GlobalObject>(this)->getComdat();
+}
+
+void GlobalObject::setSection(StringRef S) { Section = S; }
+
+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() && !F->isMaterializable();
+
+ // 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,
+ bool isExternallyInitialized)
+ : GlobalObject(Ty, Value::GlobalVariableVal,
+ OperandTraits<GlobalVariable>::op_begin(this),
+ InitVal != nullptr, Link, Name, AddressSpace),
+ isConstantGlobal(constant),
+ isExternallyInitializedConstant(isExternallyInitialized) {
+ setThreadLocalMode(TLMode);
+ if (InitVal) {
+ assert(InitVal->getType() == Ty &&
+ "Initializer should be the same type as the GlobalVariable!");
+ Op<0>() = InitVal;
+ }
+}
+
+GlobalVariable::GlobalVariable(Module &M, Type *Ty, bool constant,
+ LinkageTypes Link, Constant *InitVal,
+ const Twine &Name, GlobalVariable *Before,
+ ThreadLocalMode TLMode, unsigned AddressSpace,
+ bool isExternallyInitialized)
+ : GlobalObject(Ty, Value::GlobalVariableVal,
+ OperandTraits<GlobalVariable>::op_begin(this),
+ InitVal != nullptr, Link, Name, AddressSpace),
+ isConstantGlobal(constant),
+ isExternallyInitializedConstant(isExternallyInitialized) {
+ setThreadLocalMode(TLMode);
+ if (InitVal) {
+ assert(InitVal->getType() == Ty &&
+ "Initializer should be the same type as the GlobalVariable!");
+ Op<0>() = InitVal;
+ }
+
+ if (Before)
+ Before->getParent()->getGlobalList().insert(Before->getIterator(), this);
+ else
+ M.getGlobalList().push_back(this);
+}
+
+void GlobalVariable::setParent(Module *parent) {
+ Parent = parent;
+}
+
+void GlobalVariable::removeFromParent() {
+ getParent()->getGlobalList().remove(getIterator());
+}
+
+void GlobalVariable::eraseFromParent() {
+ getParent()->getGlobalList().erase(getIterator());
+}
+
+void GlobalVariable::setInitializer(Constant *InitVal) {
+ if (!InitVal) {
+ if (hasInitializer()) {
+ // Note, the num operands is used to compute the offset of the operand, so
+ // the order here matters. Clearing the operand then clearing the num
+ // operands ensures we have the correct offset to the operand.
+ Op<0>().set(nullptr);
+ setGlobalVariableNumOperands(0);
+ }
+ } else {
+ assert(InitVal->getType() == getType()->getElementType() &&
+ "Initializer type must match GlobalVariable type");
+ // Note, the num operands is used to compute the offset of the operand, so
+ // the order here matters. We need to set num operands to 1 first so that
+ // we get the correct offset to the first operand when we set it.
+ if (!hasInitializer())
+ setGlobalVariableNumOperands(1);
+ Op<0>().set(InitVal);
+ }
+}
+
+/// Copy all additional attributes (those not needed to create a GlobalVariable)
+/// from the GlobalVariable Src to this one.
+void GlobalVariable::copyAttributesFrom(const GlobalValue *Src) {
+ GlobalObject::copyAttributesFrom(Src);
+ if (const GlobalVariable *SrcVar = dyn_cast<GlobalVariable>(Src)) {
+ setThreadLocalMode(SrcVar->getThreadLocalMode());
+ setExternallyInitialized(SrcVar->isExternallyInitialized());
+ }
+}
+
+
+//===----------------------------------------------------------------------===//
+// 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;
+
+ if (ParentModule)
+ ParentModule->getAliasList().push_back(this);
+}
+
+GlobalAlias *GlobalAlias::create(Type *Ty, unsigned AddressSpace,
+ LinkageTypes Link, const Twine &Name,
+ Constant *Aliasee, Module *ParentModule) {
+ return new GlobalAlias(Ty, AddressSpace, Link, Name, Aliasee, ParentModule);
+}
+
+GlobalAlias *GlobalAlias::create(Type *Ty, unsigned AddressSpace,
+ LinkageTypes Linkage, const Twine &Name,
+ Module *Parent) {
+ return create(Ty, AddressSpace, Linkage, Name, nullptr, Parent);
+}
+
+GlobalAlias *GlobalAlias::create(Type *Ty, unsigned AddressSpace,
+ LinkageTypes Linkage, const Twine &Name,
+ GlobalValue *Aliasee) {
+ return create(Ty, AddressSpace, Linkage, Name, Aliasee, Aliasee->getParent());
+}
+
+GlobalAlias *GlobalAlias::create(LinkageTypes Link, const Twine &Name,
+ GlobalValue *Aliasee) {
+ PointerType *PTy = Aliasee->getType();
+ return create(PTy->getElementType(), PTy->getAddressSpace(), Link, Name,
+ Aliasee);
+}
+
+GlobalAlias *GlobalAlias::create(const Twine &Name, GlobalValue *Aliasee) {
+ return create(Aliasee->getLinkage(), Name, Aliasee);
+}
+
+void GlobalAlias::setParent(Module *parent) {
+ Parent = parent;
+}
+
+void GlobalAlias::removeFromParent() {
+ getParent()->getAliasList().remove(getIterator());
+}
+
+void GlobalAlias::eraseFromParent() {
+ getParent()->getAliasList().erase(getIterator());
+}
+
+void GlobalAlias::setAliasee(Constant *Aliasee) {
+ assert((!Aliasee || Aliasee->getType() == getType()) &&
+ "Alias and aliasee types should match!");
+ setOperand(0, Aliasee);
+}
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