X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FVMCore%2FGlobals.cpp;h=4254fb29e88b8969e7427e39b1467cdd3ad08fd2;hb=0e64f810a521806838bf90d77f081d3a1da98b5e;hp=aeb34f43715d46aed6d8afe3286b33a63a5de72b;hpb=c6c98af9e5814e8066c82f20ca11cf646a5fc289;p=oota-llvm.git diff --git a/lib/VMCore/Globals.cpp b/lib/VMCore/Globals.cpp index aeb34f43715..4254fb29e88 100644 --- a/lib/VMCore/Globals.cpp +++ b/lib/VMCore/Globals.cpp @@ -2,8 +2,8 @@ // // 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. // //===----------------------------------------------------------------------===// // @@ -17,6 +17,8 @@ #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; @@ -24,103 +26,99 @@ 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(C)) return false; // Cannot remove this - - while (!C->use_empty()) { - Constant *User = dyn_cast(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(*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(this)) + return GV->getNumOperands() == 0; + + // Functions are definitions if they have a body. + if (const Function *F = dyn_cast(this)) + return F->empty(); + + // Aliases are always definitions. + assert(isa(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), +GlobalVariable::GlobalVariable(Type *Ty, bool constant, LinkageTypes Link, + Constant *InitVal, const Twine &Name, + bool ThreadLocal, unsigned AddressSpace) + : GlobalValue(PointerType::get(Ty, AddressSpace), + Value::GlobalVariableVal, + OperandTraits::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 *Before, bool ThreadLocal) - : GlobalValue(PointerType::get(Ty), Value::GlobalVariableVal, - &Initializer, InitVal != 0, Link, Name), +GlobalVariable::GlobalVariable(Module &M, Type *Ty, bool constant, + LinkageTypes Link, Constant *InitVal, + const Twine &Name, + GlobalVariable *Before, bool ThreadLocal, + unsigned AddressSpace) + : GlobalValue(PointerType::get(Ty, AddressSpace), + Value::GlobalVariableVal, + OperandTraits::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) { @@ -159,19 +157,44 @@ void GlobalVariable::replaceUsesOfWithOnConstant(Value *From, Value *To, this->setOperand(0, cast(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(Src) && "Expected a GlobalVariable!"); + GlobalValue::copyAttributesFrom(Src); + const GlobalVariable *SrcVar = cast(Src); + setThreadLocal(SrcVar->isThreadLocal()); +} + + //===----------------------------------------------------------------------===// // GlobalAlias Implementation //===----------------------------------------------------------------------===// -GlobalAlias::GlobalAlias(const Type *Ty, LinkageTypes Link, - const std::string &Name, Constant* aliasee, +GlobalAlias::GlobalAlias(Type *Ty, LinkageTypes Link, + 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); @@ -193,37 +216,48 @@ void GlobalAlias::eraseFromParent() { getParent()->getAliasList().erase(this); } -bool GlobalAlias::isDeclaration() const { - const GlobalValue* AV = getAliasedGlobal(); - if (AV) - return AV->isDeclaration(); - else - return false; -} - -void GlobalAlias::setAliasee(Constant *Aliasee) -{ - if (Aliasee) - assert(Aliasee->getType() == getType() && - "Alias and aliasee types should match!"); +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 GlobalValue *GlobalAlias::getAliasedGlobal() const { const Constant *C = getAliasee(); - if (C) { - if (const GlobalValue *GV = dyn_cast(C)) - return GV; - else { - const ConstantExpr *CE = 0; - if ((CE = dyn_cast(Aliasee)) && - (CE->getOpcode() == Instruction::BitCast)) - return cast(CE->getOperand(0)); - else - assert(0 && "Unsupported aliasee"); - } - } else - return 0; + if (C == 0) return 0; + + if (const GlobalValue *GV = dyn_cast(C)) + return GV; + + const ConstantExpr *CE = cast(C); + assert((CE->getOpcode() == Instruction::BitCast || + CE->getOpcode() == Instruction::GetElementPtr) && + "Unsupported aliasee"); + + return cast(CE->getOperand(0)); } +const GlobalValue *GlobalAlias::resolveAliasedGlobal(bool stopOnWeak) const { + SmallPtrSet 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(GV)) { + if (stopOnWeak && GA->mayBeOverridden()) + break; + + GV = GA->getAliasedGlobal(); + + if (!Visited.insert(GV)) + return 0; + } + + return GV; +}