//
// 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.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
+#include "llvm/Constants.h"
#include "llvm/GlobalVariable.h"
#include "llvm/GlobalAlias.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LeakDetector.h"
using namespace llvm;
// GlobalValue Class
//===----------------------------------------------------------------------===//
-/// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
-/// it. This involves recursively eliminating any dead users of the
-/// constantexpr.
-static bool removeDeadUsersOfConstant(Constant *C) {
- if (isa<GlobalValue>(C)) return false; // Cannot remove this
-
- while (!C->use_empty()) {
- Constant *User = dyn_cast<Constant>(C->use_back());
- if (!User) return false; // Non-constant usage;
- if (!removeDeadUsersOfConstant(User))
- return false; // Constant wasn't dead
- }
-
- C->destroyConstant();
- return true;
-}
-
-/// removeDeadConstantUsers - If there are any dead constant users dangling
-/// off of this global value, remove them. This method is useful for clients
-/// that want to check to see if a global is unused, but don't want to deal
-/// with potentially dead constants hanging off of the globals.
-void GlobalValue::removeDeadConstantUsers() {
- Value::use_iterator I = use_begin(), E = use_end();
- Value::use_iterator LastNonDeadUser = E;
- while (I != E) {
- if (Constant *User = dyn_cast<Constant>(*I)) {
- if (!removeDeadUsersOfConstant(User)) {
- // If the constant wasn't dead, remember that this was the last live use
- // and move on to the next constant.
- LastNonDeadUser = I;
- ++I;
- } else {
- // If the constant was dead, then the iterator is invalidated.
- if (LastNonDeadUser == E) {
- I = use_begin();
- if (I == E) break;
- } else {
- I = LastNonDeadUser;
- ++I;
- }
- }
- } else {
- LastNonDeadUser = I;
- ++I;
- }
- }
+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() {
- assert(0 && "You can't GV->destroyConstant()!");
- abort();
+ 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(const Type *Ty, bool constant, LinkageTypes Link,
- Constant *InitVal, const std::string &Name,
- Module *ParentModule, bool ThreadLocal)
- : GlobalValue(PointerType::get(Ty), Value::GlobalVariableVal,
- &Initializer, InitVal != 0, Link, Name),
- isConstantGlobal(constant), isThreadLocalSymbol(ThreadLocal) {
+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!");
- Initializer.init(InitVal, this);
- } else {
- Initializer.init(0, this);
+ Op<0>() = InitVal;
}
LeakDetector::addGarbageObject(this);
-
- if (ParentModule)
- ParentModule->getGlobalList().push_back(this);
}
-GlobalVariable::GlobalVariable(const Type *Ty, bool constant, LinkageTypes Link,
- Constant *InitVal, const std::string &Name,
- GlobalVariable *Before, bool ThreadLocal)
- : GlobalValue(PointerType::get(Ty), Value::GlobalVariableVal,
- &Initializer, InitVal != 0, Link, Name),
- isConstantGlobal(constant), isThreadLocalSymbol(ThreadLocal) {
+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!");
- Initializer.init(InitVal, this);
- } else {
- Initializer.init(0, this);
+ 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) {
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(const Type *Ty, LinkageTypes Link,
- const std::string &Name, const GlobalValue* aliasee,
+GlobalAlias::GlobalAlias(Type *Ty, LinkageTypes Link,
+ const Twine &Name, Constant* aliasee,
Module *ParentModule)
- : GlobalValue(Ty, Value::GlobalAliasVal, 0, 0,
- Link, Name), Aliasee(aliasee) {
+ : 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);
}
getParent()->getAliasList().erase(this);
}
-bool GlobalAlias::isDeclaration() const {
- return (Aliasee && Aliasee->isDeclaration());
+void GlobalAlias::setAliasee(Constant *Aliasee) {
+ assert((!Aliasee || Aliasee->getType() == getType()) &&
+ "Alias and aliasee types should match!");
+
+ setOperand(0, Aliasee);
}
-void GlobalAlias::setAliasee(const GlobalValue *GV)
-{
- // FIXME: Some checks?
- Aliasee = GV;
+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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