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Diffstat (limited to 'contrib/llvm/lib/IR/Globals.cpp')
-rw-r--r-- | contrib/llvm/lib/IR/Globals.cpp | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/contrib/llvm/lib/IR/Globals.cpp b/contrib/llvm/lib/IR/Globals.cpp new file mode 100644 index 000000000000..244e3e4baeed --- /dev/null +++ b/contrib/llvm/lib/IR/Globals.cpp @@ -0,0 +1,301 @@ +//===-- 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/LeakDetector.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 { + 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); +} + +const DataLayout *GlobalValue::getDataLayout() const { + return getParent()->getDataLayout(); +} + +/// 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) { + 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!"); + setGlobalValueSubClassData(Log2_32(Align) + 1); + assert(getAlignment() == Align && "Alignment representation error!"); +} + +void GlobalObject::copyAttributesFrom(const GlobalValue *Src) { + const auto *GV = cast<GlobalObject>(Src); + GlobalValue::copyAttributesFrom(GV); + 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(); + + // 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(PointerType::get(Ty, AddressSpace), Value::GlobalVariableVal, + OperandTraits<GlobalVariable>::op_begin(this), + InitVal != nullptr, Link, Name), + isConstantGlobal(constant), + isExternallyInitializedConstant(isExternallyInitialized) { + setThreadLocalMode(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, + bool isExternallyInitialized) + : GlobalObject(PointerType::get(Ty, AddressSpace), Value::GlobalVariableVal, + OperandTraits<GlobalVariable>::op_begin(this), + InitVal != nullptr, Link, Name), + isConstantGlobal(constant), + isExternallyInitializedConstant(isExternallyInitialized) { + setThreadLocalMode(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) { + if (hasInitializer()) { + Op<0>().set(nullptr); + 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!"); + GlobalObject::copyAttributesFrom(Src); + const GlobalVariable *SrcVar = cast<GlobalVariable>(Src); + setThreadLocalMode(SrcVar->getThreadLocalMode()); +} + + +//===----------------------------------------------------------------------===// +// GlobalAlias Implementation +//===----------------------------------------------------------------------===// + +GlobalAlias::GlobalAlias(Type *Ty, unsigned AddressSpace, LinkageTypes Link, + const Twine &Name, Constant *Aliasee, + Module *ParentModule) + : GlobalValue(PointerType::get(Ty, AddressSpace), Value::GlobalAliasVal, + &Op<0>(), 1, Link, Name) { + LeakDetector::addGarbageObject(this); + 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) { + 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); +} |