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Imported Upstream version 5.18.0.167

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Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a
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Xamarin Public Jenkins (auto-signing)
2018-10-20 08:25:10 +00:00
parent e19d552987
commit b084638f15
28489 changed files with 184 additions and 3866856 deletions
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external/llvm/lib/IR/Globals.cpp vendored
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//===-- 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 "LLVMContextImpl.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/Triple.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// GlobalValue Class
//===----------------------------------------------------------------------===//
// GlobalValue should be a Constant, plus a type, a module, some flags, and an
// intrinsic ID. Add an assert to prevent people from accidentally growing
// GlobalValue while adding flags.
static_assert(sizeof(GlobalValue) ==
sizeof(Constant) + 2 * sizeof(void *) + 2 * sizeof(unsigned),
"unexpected GlobalValue size growth");
// GlobalObject adds a comdat.
static_assert(sizeof(GlobalObject) == sizeof(GlobalValue) + sizeof(void *),
"unexpected GlobalObject size growth");
bool GlobalValue::isMaterializable() const {
if (const Function *F = dyn_cast<Function>(this))
return F->isMaterializable();
return false;
}
Error GlobalValue::materialize() {
return getParent()->materialize(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) {
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->getUnnamedAddr());
setDLLStorageClass(Src->getDLLStorageClass());
setDSOLocal(Src->isDSOLocal());
}
void GlobalValue::removeFromParent() {
switch (getValueID()) {
#define HANDLE_GLOBAL_VALUE(NAME) \
case Value::NAME##Val: \
return static_cast<NAME *>(this)->removeFromParent();
#include "llvm/IR/Value.def"
default:
break;
}
llvm_unreachable("not a global");
}
void GlobalValue::eraseFromParent() {
switch (getValueID()) {
#define HANDLE_GLOBAL_VALUE(NAME) \
case Value::NAME##Val: \
return static_cast<NAME *>(this)->eraseFromParent();
#include "llvm/IR/Value.def"
default:
break;
}
llvm_unreachable("not a global");
}
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!");
}
void GlobalObject::copyAttributesFrom(const GlobalObject *Src) {
GlobalValue::copyAttributesFrom(Src);
setAlignment(Src->getAlignment());
setSection(Src->getSection());
}
std::string GlobalValue::getGlobalIdentifier(StringRef Name,
GlobalValue::LinkageTypes Linkage,
StringRef FileName) {
// Value names may be prefixed with a binary '1' to indicate
// that the backend should not modify the symbols due to any platform
// naming convention. Do not include that '1' in the PGO profile name.
if (Name[0] == '\1')
Name = Name.substr(1);
std::string NewName = Name;
if (llvm::GlobalValue::isLocalLinkage(Linkage)) {
// For local symbols, prepend the main file name to distinguish them.
// Do not include the full path in the file name since there's no guarantee
// that it will stay the same, e.g., if the files are checked out from
// version control in different locations.
if (FileName.empty())
NewName = NewName.insert(0, "<unknown>:");
else
NewName = NewName.insert(0, FileName.str() + ":");
}
return NewName;
}
std::string GlobalValue::getGlobalIdentifier() const {
return getGlobalIdentifier(getName(), getLinkage(),
getParent()->getSourceFileName());
}
StringRef 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();
}
const Comdat *GlobalValue::getComdat() 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 const_cast<GlobalObject *>(GO)->getComdat();
return nullptr;
}
// ifunc and its resolver are separate things so don't use resolver comdat.
if (isa<GlobalIFunc>(this))
return nullptr;
return cast<GlobalObject>(this)->getComdat();
}
StringRef GlobalObject::getSectionImpl() const {
assert(hasSection());
return getContext().pImpl->GlobalObjectSections[this];
}
void GlobalObject::setSection(StringRef S) {
// Do nothing if we're clearing the section and it is already empty.
if (!hasSection() && S.empty())
return;
// Get or create a stable section name string and put it in the table in the
// context.
if (!S.empty()) {
S = getContext().pImpl->SectionStrings.insert(S).first->first();
}
getContext().pImpl->GlobalObjectSections[this] = S;
// Update the HasSectionHashEntryBit. Setting the section to the empty string
// means this global no longer has a section.
setGlobalObjectFlag(HasSectionHashEntryBit, !S.empty());
}
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 and ifuncs are always definitions.
assert(isa<GlobalIndirectSymbol>(this));
return false;
}
bool GlobalValue::canIncreaseAlignment() const {
// Firstly, can only increase the alignment of a global if it
// is a strong definition.
if (!isStrongDefinitionForLinker())
return false;
// It also has to either not have a section defined, or, not have
// alignment specified. (If it is assigned a section, the global
// could be densely packed with other objects in the section, and
// increasing the alignment could cause padding issues.)
if (hasSection() && getAlignment() > 0)
return false;
// On ELF platforms, we're further restricted in that we can't
// increase the alignment of any variable which might be emitted
// into a shared library, and which is exported. If the main
// executable accesses a variable found in a shared-lib, the main
// exe actually allocates memory for and exports the symbol ITSELF,
// overriding the symbol found in the library. That is, at link
// time, the observed alignment of the variable is copied into the
// executable binary. (A COPY relocation is also generated, to copy
// the initial data from the shadowed variable in the shared-lib
// into the location in the main binary, before running code.)
//
// And thus, even though you might think you are defining the
// global, and allocating the memory for the global in your object
// file, and thus should be able to set the alignment arbitrarily,
// that's not actually true. Doing so can cause an ABI breakage; an
// executable might have already been built with the previous
// alignment of the variable, and then assuming an increased
// alignment will be incorrect.
// Conservatively assume ELF if there's no parent pointer.
bool isELF =
(!Parent || Triple(Parent->getTargetTriple()).isOSBinFormatELF());
if (isELF && hasDefaultVisibility() && !hasLocalLinkage())
return false;
return true;
}
const GlobalObject *GlobalValue::getBaseObject() const {
if (auto *GO = dyn_cast<GlobalObject>(this))
return GO;
if (auto *GA = dyn_cast<GlobalIndirectSymbol>(this))
return GA->getBaseObject();
return nullptr;
}
bool GlobalValue::isAbsoluteSymbolRef() const {
auto *GO = dyn_cast<GlobalObject>(this);
if (!GO)
return false;
return GO->getMetadata(LLVMContext::MD_absolute_symbol);
}
Optional<ConstantRange> GlobalValue::getAbsoluteSymbolRange() const {
auto *GO = dyn_cast<GlobalObject>(this);
if (!GO)
return None;
MDNode *MD = GO->getMetadata(LLVMContext::MD_absolute_symbol);
if (!MD)
return None;
return getConstantRangeFromMetadata(*MD);
}
//===----------------------------------------------------------------------===//
// GlobalVariable Implementation
//===----------------------------------------------------------------------===//
GlobalVariable::GlobalVariable(Type *Ty, bool constant, LinkageTypes Link,
Constant *InitVal, const Twine &Name,
ThreadLocalMode TLMode, unsigned AddressSpace,
bool isExternallyInitialized)
: GlobalObject(Ty, Value::GlobalVariableVal,
OperandTraits<GlobalVariable>::op_begin(this),
InitVal != nullptr, Link, Name, AddressSpace),
isConstantGlobal(constant),
isExternallyInitializedConstant(isExternallyInitialized) {
assert(!Ty->isFunctionTy() && PointerType::isValidElementType(Ty) &&
"invalid type for global variable");
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(Ty, Value::GlobalVariableVal,
OperandTraits<GlobalVariable>::op_begin(this),
InitVal != nullptr, Link, Name, AddressSpace),
isConstantGlobal(constant),
isExternallyInitializedConstant(isExternallyInitialized) {
assert(!Ty->isFunctionTy() && PointerType::isValidElementType(Ty) &&
"invalid type for global variable");
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->getIterator(), this);
else
M.getGlobalList().push_back(this);
}
void GlobalVariable::removeFromParent() {
getParent()->getGlobalList().remove(getIterator());
}
void GlobalVariable::eraseFromParent() {
getParent()->getGlobalList().erase(getIterator());
}
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() == getValueType() &&
"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);
}
}
/// Copy all additional attributes (those not needed to create a GlobalVariable)
/// from the GlobalVariable Src to this one.
void GlobalVariable::copyAttributesFrom(const GlobalVariable *Src) {
GlobalObject::copyAttributesFrom(Src);
setThreadLocalMode(Src->getThreadLocalMode());
setExternallyInitialized(Src->isExternallyInitialized());
setAttributes(Src->getAttributes());
}
void GlobalVariable::dropAllReferences() {
User::dropAllReferences();
clearMetadata();
}
//===----------------------------------------------------------------------===//
// GlobalIndirectSymbol Implementation
//===----------------------------------------------------------------------===//
GlobalIndirectSymbol::GlobalIndirectSymbol(Type *Ty, ValueTy VTy,
unsigned AddressSpace, LinkageTypes Linkage, const Twine &Name,
Constant *Symbol)
: GlobalValue(Ty, VTy, &Op<0>(), 1, Linkage, Name, AddressSpace) {
Op<0>() = Symbol;
}
//===----------------------------------------------------------------------===//
// GlobalAlias Implementation
//===----------------------------------------------------------------------===//
GlobalAlias::GlobalAlias(Type *Ty, unsigned AddressSpace, LinkageTypes Link,
const Twine &Name, Constant *Aliasee,
Module *ParentModule)
: GlobalIndirectSymbol(Ty, Value::GlobalAliasVal, AddressSpace, Link, Name,
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::removeFromParent() {
getParent()->getAliasList().remove(getIterator());
}
void GlobalAlias::eraseFromParent() {
getParent()->getAliasList().erase(getIterator());
}
void GlobalAlias::setAliasee(Constant *Aliasee) {
assert((!Aliasee || Aliasee->getType() == getType()) &&
"Alias and aliasee types should match!");
setIndirectSymbol(Aliasee);
}
//===----------------------------------------------------------------------===//
// GlobalIFunc Implementation
//===----------------------------------------------------------------------===//
GlobalIFunc::GlobalIFunc(Type *Ty, unsigned AddressSpace, LinkageTypes Link,
const Twine &Name, Constant *Resolver,
Module *ParentModule)
: GlobalIndirectSymbol(Ty, Value::GlobalIFuncVal, AddressSpace, Link, Name,
Resolver) {
if (ParentModule)
ParentModule->getIFuncList().push_back(this);
}
GlobalIFunc *GlobalIFunc::create(Type *Ty, unsigned AddressSpace,
LinkageTypes Link, const Twine &Name,
Constant *Resolver, Module *ParentModule) {
return new GlobalIFunc(Ty, AddressSpace, Link, Name, Resolver, ParentModule);
}
void GlobalIFunc::removeFromParent() {
getParent()->getIFuncList().remove(getIterator());
}
void GlobalIFunc::eraseFromParent() {
getParent()->getIFuncList().erase(getIterator());
}