mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-25 00:29:20 +00:00
This is part of the work to devirtualize Value. The old pattern was to call replaceUsesOfWithOnConstant which was overridden by subclasses. Those could then call replaceUsesOfWithOnConstantImpl on Constant to handle deleting the current value. To be consistent with other parts of the code, this has been changed so that we call the method on Constant, and that dispatches to an Impl on subclasses. As part of this, it made sense to rename the methods to be more descriptive. The new name is Constant::handleOperandChange, and it requires that all subclasses of Constant implement handleOperandChangeImpl, even if they just throw an error if they shouldn't be called. Reviewed by Duncan Exon Smith. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240567 91177308-0d34-0410-b5e6-96231b3b80d8
286 lines
10 KiB
C++
286 lines
10 KiB
C++
//===-- 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/Module.h"
|
|
#include "llvm/IR/Operator.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
using namespace llvm;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// GlobalValue Class
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
bool GlobalValue::isMaterializable() const {
|
|
if (const Function *F = dyn_cast<Function>(this))
|
|
return F->isMaterializable();
|
|
return false;
|
|
}
|
|
bool GlobalValue::isDematerializable() const {
|
|
return getParent() && getParent()->isDematerializable(this);
|
|
}
|
|
std::error_code GlobalValue::materialize() {
|
|
return getParent()->materialize(this);
|
|
}
|
|
void GlobalValue::dematerialize() {
|
|
getParent()->dematerialize(this);
|
|
}
|
|
|
|
/// Override destroyConstantImpl to make sure it doesn't get called on
|
|
/// GlobalValue's because they shouldn't be treated like other constants.
|
|
void GlobalValue::destroyConstantImpl() {
|
|
llvm_unreachable("You can't GV->destroyConstantImpl()!");
|
|
}
|
|
|
|
Value *GlobalValue::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
|
|
llvm_unreachable("Unsupported class for handleOperandChange()!");
|
|
}
|
|
|
|
/// 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!");
|
|
unsigned AlignmentData = Log2_32(Align) + 1;
|
|
unsigned OldData = getGlobalValueSubClassData();
|
|
setGlobalValueSubClassData((OldData & ~AlignmentMask) | AlignmentData);
|
|
assert(getAlignment() == Align && "Alignment representation error!");
|
|
}
|
|
|
|
unsigned GlobalObject::getGlobalObjectSubClassData() const {
|
|
unsigned ValueData = getGlobalValueSubClassData();
|
|
return ValueData >> AlignmentBits;
|
|
}
|
|
|
|
void GlobalObject::setGlobalObjectSubClassData(unsigned Val) {
|
|
unsigned OldData = getGlobalValueSubClassData();
|
|
setGlobalValueSubClassData((OldData & AlignmentMask) |
|
|
(Val << AlignmentBits));
|
|
assert(getGlobalObjectSubClassData() == Val && "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() && !F->isMaterializable();
|
|
|
|
// 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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
if (Before)
|
|
Before->getParent()->getGlobalList().insert(Before, this);
|
|
else
|
|
M.getGlobalList().push_back(this);
|
|
}
|
|
|
|
void GlobalVariable::setParent(Module *parent) {
|
|
Parent = parent;
|
|
}
|
|
|
|
void GlobalVariable::removeFromParent() {
|
|
getParent()->getGlobalList().remove(this);
|
|
}
|
|
|
|
void GlobalVariable::eraseFromParent() {
|
|
getParent()->getGlobalList().erase(this);
|
|
}
|
|
|
|
void GlobalVariable::setInitializer(Constant *InitVal) {
|
|
if (!InitVal) {
|
|
if (hasInitializer()) {
|
|
// Note, the num operands is used to compute the offset of the operand, so
|
|
// the order here matters. Clearing the operand then clearing the num
|
|
// operands ensures we have the correct offset to the operand.
|
|
Op<0>().set(nullptr);
|
|
setGlobalVariableNumOperands(0);
|
|
}
|
|
} else {
|
|
assert(InitVal->getType() == getType()->getElementType() &&
|
|
"Initializer type must match GlobalVariable type");
|
|
// Note, the num operands is used to compute the offset of the operand, so
|
|
// the order here matters. We need to set num operands to 1 first so that
|
|
// we get the correct offset to the first operand when we set it.
|
|
if (!hasInitializer())
|
|
setGlobalVariableNumOperands(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());
|
|
setExternallyInitialized(SrcVar->isExternallyInitialized());
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// GlobalAlias Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
GlobalAlias::GlobalAlias(PointerType *Ty, LinkageTypes Link, const Twine &Name,
|
|
Constant *Aliasee, Module *ParentModule)
|
|
: GlobalValue(Ty, Value::GlobalAliasVal, &Op<0>(), 1, Link, Name) {
|
|
Op<0>() = Aliasee;
|
|
|
|
if (ParentModule)
|
|
ParentModule->getAliasList().push_back(this);
|
|
}
|
|
|
|
GlobalAlias *GlobalAlias::create(PointerType *Ty, LinkageTypes Link,
|
|
const Twine &Name, Constant *Aliasee,
|
|
Module *ParentModule) {
|
|
return new GlobalAlias(Ty, Link, Name, Aliasee, ParentModule);
|
|
}
|
|
|
|
GlobalAlias *GlobalAlias::create(PointerType *Ty, LinkageTypes Linkage,
|
|
const Twine &Name, Module *Parent) {
|
|
return create(Ty, Linkage, Name, nullptr, Parent);
|
|
}
|
|
|
|
GlobalAlias *GlobalAlias::create(PointerType *Ty, LinkageTypes Linkage,
|
|
const Twine &Name, GlobalValue *Aliasee) {
|
|
return create(Ty, Linkage, Name, Aliasee, Aliasee->getParent());
|
|
}
|
|
|
|
GlobalAlias *GlobalAlias::create(LinkageTypes Link, const Twine &Name,
|
|
GlobalValue *Aliasee) {
|
|
PointerType *PTy = Aliasee->getType();
|
|
return create(PTy, Link, Name, Aliasee);
|
|
}
|
|
|
|
GlobalAlias *GlobalAlias::create(const Twine &Name, GlobalValue *Aliasee) {
|
|
return create(Aliasee->getLinkage(), Name, Aliasee);
|
|
}
|
|
|
|
void GlobalAlias::setParent(Module *parent) {
|
|
Parent = parent;
|
|
}
|
|
|
|
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);
|
|
}
|