mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-16 11:30:51 +00:00
c498284e46
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220600 91177308-0d34-0410-b5e6-96231b3b80d8
363 lines
13 KiB
C++
363 lines
13 KiB
C++
//===-- llvm/GlobalValue.h - Class to represent a global value --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is a common base class of all globally definable objects. As such,
|
|
// it is subclassed by GlobalVariable, GlobalAlias and by Function. This is
|
|
// used because you can do certain things with these global objects that you
|
|
// can't do to anything else. For example, use the address of one as a
|
|
// constant.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_IR_GLOBALVALUE_H
|
|
#define LLVM_IR_GLOBALVALUE_H
|
|
|
|
#include "llvm/IR/Constant.h"
|
|
#include "llvm/IR/DerivedTypes.h"
|
|
|
|
#include <system_error>
|
|
|
|
namespace llvm {
|
|
|
|
class Comdat;
|
|
class PointerType;
|
|
class Module;
|
|
|
|
class GlobalValue : public Constant {
|
|
GlobalValue(const GlobalValue &) LLVM_DELETED_FUNCTION;
|
|
public:
|
|
/// @brief An enumeration for the kinds of linkage for global values.
|
|
enum LinkageTypes {
|
|
ExternalLinkage = 0,///< Externally visible function
|
|
AvailableExternallyLinkage, ///< Available for inspection, not emission.
|
|
LinkOnceAnyLinkage, ///< Keep one copy of function when linking (inline)
|
|
LinkOnceODRLinkage, ///< Same, but only replaced by something equivalent.
|
|
WeakAnyLinkage, ///< Keep one copy of named function when linking (weak)
|
|
WeakODRLinkage, ///< Same, but only replaced by something equivalent.
|
|
AppendingLinkage, ///< Special purpose, only applies to global arrays
|
|
InternalLinkage, ///< Rename collisions when linking (static functions).
|
|
PrivateLinkage, ///< Like Internal, but omit from symbol table.
|
|
ExternalWeakLinkage,///< ExternalWeak linkage description.
|
|
CommonLinkage ///< Tentative definitions.
|
|
};
|
|
|
|
/// @brief An enumeration for the kinds of visibility of global values.
|
|
enum VisibilityTypes {
|
|
DefaultVisibility = 0, ///< The GV is visible
|
|
HiddenVisibility, ///< The GV is hidden
|
|
ProtectedVisibility ///< The GV is protected
|
|
};
|
|
|
|
/// @brief Storage classes of global values for PE targets.
|
|
enum DLLStorageClassTypes {
|
|
DefaultStorageClass = 0,
|
|
DLLImportStorageClass = 1, ///< Function to be imported from DLL
|
|
DLLExportStorageClass = 2 ///< Function to be accessible from DLL.
|
|
};
|
|
|
|
protected:
|
|
GlobalValue(Type *Ty, ValueTy VTy, Use *Ops, unsigned NumOps,
|
|
LinkageTypes Linkage, const Twine &Name)
|
|
: Constant(Ty, VTy, Ops, NumOps), Linkage(Linkage),
|
|
Visibility(DefaultVisibility), UnnamedAddr(0),
|
|
DllStorageClass(DefaultStorageClass),
|
|
ThreadLocal(NotThreadLocal), Parent(nullptr) {
|
|
setName(Name);
|
|
}
|
|
|
|
// Note: VC++ treats enums as signed, so an extra bit is required to prevent
|
|
// Linkage and Visibility from turning into negative values.
|
|
LinkageTypes Linkage : 5; // The linkage of this global
|
|
unsigned Visibility : 2; // The visibility style of this global
|
|
unsigned UnnamedAddr : 1; // This value's address is not significant
|
|
unsigned DllStorageClass : 2; // DLL storage class
|
|
|
|
unsigned ThreadLocal : 3; // Is this symbol "Thread Local", if so, what is
|
|
// the desired model?
|
|
|
|
private:
|
|
// Give subclasses access to what otherwise would be wasted padding.
|
|
// (19 + 3 + 2 + 1 + 2 + 5) == 32.
|
|
unsigned SubClassData : 19;
|
|
protected:
|
|
static const unsigned GlobalValueSubClassDataBits = 19;
|
|
unsigned getGlobalValueSubClassData() const {
|
|
return SubClassData;
|
|
}
|
|
void setGlobalValueSubClassData(unsigned V) {
|
|
assert(V < (1 << 19) && "It will not fit");
|
|
SubClassData = V;
|
|
}
|
|
|
|
Module *Parent; // The containing module.
|
|
public:
|
|
enum ThreadLocalMode {
|
|
NotThreadLocal = 0,
|
|
GeneralDynamicTLSModel,
|
|
LocalDynamicTLSModel,
|
|
InitialExecTLSModel,
|
|
LocalExecTLSModel
|
|
};
|
|
|
|
~GlobalValue() {
|
|
removeDeadConstantUsers(); // remove any dead constants using this.
|
|
}
|
|
|
|
unsigned getAlignment() const;
|
|
|
|
bool hasUnnamedAddr() const { return UnnamedAddr; }
|
|
void setUnnamedAddr(bool Val) { UnnamedAddr = Val; }
|
|
|
|
bool hasComdat() const { return getComdat() != nullptr; }
|
|
Comdat *getComdat();
|
|
const Comdat *getComdat() const {
|
|
return const_cast<GlobalValue *>(this)->getComdat();
|
|
}
|
|
|
|
VisibilityTypes getVisibility() const { return VisibilityTypes(Visibility); }
|
|
bool hasDefaultVisibility() const { return Visibility == DefaultVisibility; }
|
|
bool hasHiddenVisibility() const { return Visibility == HiddenVisibility; }
|
|
bool hasProtectedVisibility() const {
|
|
return Visibility == ProtectedVisibility;
|
|
}
|
|
void setVisibility(VisibilityTypes V) {
|
|
assert((!hasLocalLinkage() || V == DefaultVisibility) &&
|
|
"local linkage requires default visibility");
|
|
Visibility = V;
|
|
}
|
|
|
|
/// If the value is "Thread Local", its value isn't shared by the threads.
|
|
bool isThreadLocal() const { return getThreadLocalMode() != NotThreadLocal; }
|
|
void setThreadLocal(bool Val) {
|
|
setThreadLocalMode(Val ? GeneralDynamicTLSModel : NotThreadLocal);
|
|
}
|
|
void setThreadLocalMode(ThreadLocalMode Val) {
|
|
assert(Val == NotThreadLocal || getValueID() != Value::FunctionVal);
|
|
ThreadLocal = Val;
|
|
}
|
|
ThreadLocalMode getThreadLocalMode() const {
|
|
return static_cast<ThreadLocalMode>(ThreadLocal);
|
|
}
|
|
|
|
DLLStorageClassTypes getDLLStorageClass() const {
|
|
return DLLStorageClassTypes(DllStorageClass);
|
|
}
|
|
bool hasDLLImportStorageClass() const {
|
|
return DllStorageClass == DLLImportStorageClass;
|
|
}
|
|
bool hasDLLExportStorageClass() const {
|
|
return DllStorageClass == DLLExportStorageClass;
|
|
}
|
|
void setDLLStorageClass(DLLStorageClassTypes C) { DllStorageClass = C; }
|
|
|
|
bool hasSection() const { return !StringRef(getSection()).empty(); }
|
|
// It is unfortunate that we have to use "char *" in here since this is
|
|
// always non NULL, but:
|
|
// * The C API expects a null terminated string, so we cannot use StringRef.
|
|
// * The C API expects us to own it, so we cannot use a std:string.
|
|
// * For GlobalAliases we can fail to find the section and we have to
|
|
// return "", so we cannot use a "const std::string &".
|
|
const char *getSection() const;
|
|
|
|
/// Global values are always pointers.
|
|
inline PointerType *getType() const {
|
|
return cast<PointerType>(User::getType());
|
|
}
|
|
|
|
static LinkageTypes getLinkOnceLinkage(bool ODR) {
|
|
return ODR ? LinkOnceODRLinkage : LinkOnceAnyLinkage;
|
|
}
|
|
static LinkageTypes getWeakLinkage(bool ODR) {
|
|
return ODR ? WeakODRLinkage : WeakAnyLinkage;
|
|
}
|
|
|
|
static bool isExternalLinkage(LinkageTypes Linkage) {
|
|
return Linkage == ExternalLinkage;
|
|
}
|
|
static bool isAvailableExternallyLinkage(LinkageTypes Linkage) {
|
|
return Linkage == AvailableExternallyLinkage;
|
|
}
|
|
static bool isLinkOnceODRLinkage(LinkageTypes Linkage) {
|
|
return Linkage == LinkOnceODRLinkage;
|
|
}
|
|
static bool isLinkOnceLinkage(LinkageTypes Linkage) {
|
|
return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
|
|
}
|
|
static bool isWeakAnyLinkage(LinkageTypes Linkage) {
|
|
return Linkage == WeakAnyLinkage;
|
|
}
|
|
static bool isWeakODRLinkage(LinkageTypes Linkage) {
|
|
return Linkage == WeakODRLinkage;
|
|
}
|
|
static bool isWeakLinkage(LinkageTypes Linkage) {
|
|
return isWeakAnyLinkage(Linkage) || isWeakODRLinkage(Linkage);
|
|
}
|
|
static bool isAppendingLinkage(LinkageTypes Linkage) {
|
|
return Linkage == AppendingLinkage;
|
|
}
|
|
static bool isInternalLinkage(LinkageTypes Linkage) {
|
|
return Linkage == InternalLinkage;
|
|
}
|
|
static bool isPrivateLinkage(LinkageTypes Linkage) {
|
|
return Linkage == PrivateLinkage;
|
|
}
|
|
static bool isLocalLinkage(LinkageTypes Linkage) {
|
|
return isInternalLinkage(Linkage) || isPrivateLinkage(Linkage);
|
|
}
|
|
static bool isExternalWeakLinkage(LinkageTypes Linkage) {
|
|
return Linkage == ExternalWeakLinkage;
|
|
}
|
|
static bool isCommonLinkage(LinkageTypes Linkage) {
|
|
return Linkage == CommonLinkage;
|
|
}
|
|
|
|
/// Whether the definition of this global may be discarded if it is not used
|
|
/// in its compilation unit.
|
|
static bool isDiscardableIfUnused(LinkageTypes Linkage) {
|
|
return isLinkOnceLinkage(Linkage) || isLocalLinkage(Linkage);
|
|
}
|
|
|
|
/// Whether the definition of this global may be replaced by something
|
|
/// non-equivalent at link time. For example, if a function has weak linkage
|
|
/// then the code defining it may be replaced by different code.
|
|
static bool mayBeOverridden(LinkageTypes Linkage) {
|
|
return Linkage == WeakAnyLinkage || Linkage == LinkOnceAnyLinkage ||
|
|
Linkage == CommonLinkage || Linkage == ExternalWeakLinkage;
|
|
}
|
|
|
|
/// Whether the definition of this global may be replaced at link time. NB:
|
|
/// Using this method outside of the code generators is almost always a
|
|
/// mistake: when working at the IR level use mayBeOverridden instead as it
|
|
/// knows about ODR semantics.
|
|
static bool isWeakForLinker(LinkageTypes Linkage) {
|
|
return Linkage == AvailableExternallyLinkage || Linkage == WeakAnyLinkage ||
|
|
Linkage == WeakODRLinkage || Linkage == LinkOnceAnyLinkage ||
|
|
Linkage == LinkOnceODRLinkage || Linkage == CommonLinkage ||
|
|
Linkage == ExternalWeakLinkage;
|
|
}
|
|
|
|
bool hasExternalLinkage() const { return isExternalLinkage(Linkage); }
|
|
bool hasAvailableExternallyLinkage() const {
|
|
return isAvailableExternallyLinkage(Linkage);
|
|
}
|
|
bool hasLinkOnceLinkage() const {
|
|
return isLinkOnceLinkage(Linkage);
|
|
}
|
|
bool hasLinkOnceODRLinkage() const { return isLinkOnceODRLinkage(Linkage); }
|
|
bool hasWeakLinkage() const {
|
|
return isWeakLinkage(Linkage);
|
|
}
|
|
bool hasWeakAnyLinkage() const {
|
|
return isWeakAnyLinkage(Linkage);
|
|
}
|
|
bool hasWeakODRLinkage() const {
|
|
return isWeakODRLinkage(Linkage);
|
|
}
|
|
bool hasAppendingLinkage() const { return isAppendingLinkage(Linkage); }
|
|
bool hasInternalLinkage() const { return isInternalLinkage(Linkage); }
|
|
bool hasPrivateLinkage() const { return isPrivateLinkage(Linkage); }
|
|
bool hasLocalLinkage() const { return isLocalLinkage(Linkage); }
|
|
bool hasExternalWeakLinkage() const { return isExternalWeakLinkage(Linkage); }
|
|
bool hasCommonLinkage() const { return isCommonLinkage(Linkage); }
|
|
|
|
void setLinkage(LinkageTypes LT) {
|
|
if (isLocalLinkage(LT))
|
|
Visibility = DefaultVisibility;
|
|
Linkage = LT;
|
|
}
|
|
LinkageTypes getLinkage() const { return Linkage; }
|
|
|
|
bool isDiscardableIfUnused() const {
|
|
return isDiscardableIfUnused(Linkage);
|
|
}
|
|
|
|
bool mayBeOverridden() const { return mayBeOverridden(Linkage); }
|
|
|
|
bool isWeakForLinker() const { return isWeakForLinker(Linkage); }
|
|
|
|
/// Copy all additional attributes (those not needed to create a GlobalValue)
|
|
/// from the GlobalValue Src to this one.
|
|
virtual void copyAttributesFrom(const GlobalValue *Src);
|
|
|
|
/// If special LLVM prefix that is used to inform the asm printer to not emit
|
|
/// usual symbol prefix before the symbol name is used then return linkage
|
|
/// name after skipping this special LLVM prefix.
|
|
static StringRef getRealLinkageName(StringRef Name) {
|
|
if (!Name.empty() && Name[0] == '\1')
|
|
return Name.substr(1);
|
|
return Name;
|
|
}
|
|
|
|
/// @name Materialization
|
|
/// Materialization is used to construct functions only as they're needed. This
|
|
/// is useful to reduce memory usage in LLVM or parsing work done by the
|
|
/// BitcodeReader to load the Module.
|
|
/// @{
|
|
|
|
/// If this function's Module is being lazily streamed in functions from disk
|
|
/// or some other source, this method can be used to check to see if the
|
|
/// function has been read in yet or not.
|
|
bool isMaterializable() const;
|
|
|
|
/// Returns true if this function was loaded from a GVMaterializer that's
|
|
/// still attached to its Module and that knows how to dematerialize the
|
|
/// function.
|
|
bool isDematerializable() const;
|
|
|
|
/// Make sure this GlobalValue is fully read. If the module is corrupt, this
|
|
/// returns true and fills in the optional string with information about the
|
|
/// problem. If successful, this returns false.
|
|
std::error_code materialize();
|
|
|
|
/// If this GlobalValue is read in, and if the GVMaterializer supports it,
|
|
/// release the memory for the function, and set it up to be materialized
|
|
/// lazily. If !isDematerializable(), this method is a noop.
|
|
void Dematerialize();
|
|
|
|
/// @}
|
|
|
|
/// Override from Constant class.
|
|
void destroyConstant() override;
|
|
|
|
/// Return true if the primary definition of this global value is outside of
|
|
/// the current translation unit.
|
|
bool isDeclaration() const;
|
|
|
|
bool isDeclarationForLinker() const {
|
|
if (hasAvailableExternallyLinkage())
|
|
return true;
|
|
|
|
return isDeclaration();
|
|
}
|
|
|
|
/// This method unlinks 'this' from the containing module, but does not delete
|
|
/// it.
|
|
virtual void removeFromParent() = 0;
|
|
|
|
/// This method unlinks 'this' from the containing module and deletes it.
|
|
virtual void eraseFromParent() = 0;
|
|
|
|
/// Get the module that this global value is contained inside of...
|
|
inline Module *getParent() { return Parent; }
|
|
inline const Module *getParent() const { return Parent; }
|
|
|
|
const DataLayout *getDataLayout() const;
|
|
|
|
// Methods for support type inquiry through isa, cast, and dyn_cast:
|
|
static inline bool classof(const Value *V) {
|
|
return V->getValueID() == Value::FunctionVal ||
|
|
V->getValueID() == Value::GlobalVariableVal ||
|
|
V->getValueID() == Value::GlobalAliasVal;
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|