#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;
/// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
/// it. This involves recursively eliminating any dead users of the
/// constantexpr.
-static bool removeDeadUsersOfConstant(Constant *C) {
+static bool removeDeadUsersOfConstant(const Constant *C) {
if (isa<GlobalValue>(C)) return false; // Cannot remove this
while (!C->use_empty()) {
- Constant *User = dyn_cast<Constant>(C->use_back());
+ const 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();
+ const_cast<Constant*>(C)->destroyConstant();
return true;
}
/// 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;
+void GlobalValue::removeDeadConstantUsers() const {
+ Value::use_const_iterator I = use_begin(), E = use_end();
+ Value::use_const_iterator LastNonDeadUser = E;
while (I != E) {
- if (Constant *User = dyn_cast<Constant>(*I)) {
+ if (const 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.
}
}
+
/// 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());
+}
+
+
//===----------------------------------------------------------------------===//
// GlobalVariable Implementation
//===----------------------------------------------------------------------===//
GlobalVariable::GlobalVariable(const Type *Ty, bool constant, LinkageTypes Link,
- Constant *InitVal, const std::string &Name,
- Module *ParentModule, bool ThreadLocal,
- unsigned AddressSpace)
- : GlobalValue(PointerType::get(Ty, AddressSpace), Value::GlobalVariableVal,
- &Initializer, InitVal != 0, Link, Name),
+ Constant *InitVal, const Twine &Name,
+ bool ThreadLocal, unsigned AddressSpace)
+ : GlobalValue(PointerType::get(Ty, AddressSpace),
+ Value::GlobalVariableVal,
+ 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);
-
- if (ParentModule)
- ParentModule->getGlobalList().push_back(this);
}
-GlobalVariable::GlobalVariable(const Type *Ty, bool constant, LinkageTypes Link,
- Constant *InitVal, const std::string &Name,
+GlobalVariable::GlobalVariable(Module &M, const Type *Ty, bool constant,
+ LinkageTypes Link, Constant *InitVal,
+ const Twine &Name,
GlobalVariable *Before, bool ThreadLocal,
unsigned AddressSpace)
- : GlobalValue(PointerType::get(Ty, AddressSpace), Value::GlobalVariableVal,
- &Initializer, InitVal != 0, Link, Name),
+ : GlobalValue(PointerType::get(Ty, AddressSpace),
+ Value::GlobalVariableVal,
+ 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);
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, Constant* aliasee,
+ const Twine &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);
CE->getOpcode() == Instruction::GetElementPtr))
return dyn_cast<GlobalValue>(CE->getOperand(0));
else
- assert(0 && "Unsupported aliasee");
+ llvm_unreachable("Unsupported aliasee");
}
}
return 0;
}
-const GlobalValue *GlobalAlias::resolveAliasedGlobal() const {
+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))
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