+++ /dev/null
-//===-- 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 VMCore
-// 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;
-}
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