mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-28 14:36:34 +00:00
277 lines
11 KiB
C++
277 lines
11 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_GLOBALVALUE_H
|
|
#define LLVM_GLOBALVALUE_H
|
|
|
|
#include "llvm/Constant.h"
|
|
|
|
namespace llvm {
|
|
|
|
class PointerType;
|
|
class Module;
|
|
|
|
class GlobalValue : public Constant {
|
|
GlobalValue(const GlobalValue &); // do not implement
|
|
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.
|
|
LinkerPrivateLinkage, ///< Like Private, but linker removes.
|
|
DLLImportLinkage, ///< Function to be imported from DLL
|
|
DLLExportLinkage, ///< Function to be accessible from DLL.
|
|
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
|
|
};
|
|
|
|
protected:
|
|
GlobalValue(const Type *ty, ValueTy vty, Use *Ops, unsigned NumOps,
|
|
LinkageTypes linkage, const Twine &Name)
|
|
: Constant(ty, vty, Ops, NumOps), Parent(0),
|
|
Linkage(linkage), Visibility(DefaultVisibility), Alignment(0) {
|
|
setName(Name);
|
|
}
|
|
|
|
Module *Parent;
|
|
// 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 Alignment : 16; // Alignment of this symbol, must be power of two
|
|
std::string Section; // Section to emit this into, empty mean default
|
|
public:
|
|
~GlobalValue() {
|
|
removeDeadConstantUsers(); // remove any dead constants using this.
|
|
}
|
|
|
|
unsigned getAlignment() const { return Alignment; }
|
|
void setAlignment(unsigned Align) {
|
|
assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
|
|
Alignment = Align;
|
|
}
|
|
|
|
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) { Visibility = V; }
|
|
|
|
bool hasSection() const { return !Section.empty(); }
|
|
const std::string &getSection() const { return Section; }
|
|
void setSection(StringRef S) { Section = S; }
|
|
|
|
/// If the usage is empty (except transitively dead constants), then this
|
|
/// global value can be safely deleted since the destructor will
|
|
/// delete the dead constants as well.
|
|
/// @brief Determine if the usage of this global value is empty except
|
|
/// for transitively dead constants.
|
|
bool use_empty_except_constants();
|
|
|
|
/// getType - Global values are always pointers.
|
|
inline const PointerType *getType() const {
|
|
return reinterpret_cast<const 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 isLinkOnceLinkage(LinkageTypes Linkage) {
|
|
return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
|
|
}
|
|
static bool isWeakLinkage(LinkageTypes Linkage) {
|
|
return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage;
|
|
}
|
|
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 isLinkerPrivateLinkage(LinkageTypes Linkage) {
|
|
return Linkage==LinkerPrivateLinkage;
|
|
}
|
|
static bool isLocalLinkage(LinkageTypes Linkage) {
|
|
return isInternalLinkage(Linkage) || isPrivateLinkage(Linkage) ||
|
|
isLinkerPrivateLinkage(Linkage);
|
|
}
|
|
static bool isDLLImportLinkage(LinkageTypes Linkage) {
|
|
return Linkage == DLLImportLinkage;
|
|
}
|
|
static bool isDLLExportLinkage(LinkageTypes Linkage) {
|
|
return Linkage == DLLExportLinkage;
|
|
}
|
|
static bool isExternalWeakLinkage(LinkageTypes Linkage) {
|
|
return Linkage == ExternalWeakLinkage;
|
|
}
|
|
static bool isCommonLinkage(LinkageTypes Linkage) {
|
|
return Linkage == CommonLinkage;
|
|
}
|
|
|
|
/// mayBeOverridden - 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);
|
|
}
|
|
|
|
/// isWeakForLinker - Whether the definition of this global may be replaced at
|
|
/// link time.
|
|
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 hasWeakLinkage() const {
|
|
return isWeakLinkage(Linkage);
|
|
}
|
|
bool hasAppendingLinkage() const { return isAppendingLinkage(Linkage); }
|
|
bool hasInternalLinkage() const { return isInternalLinkage(Linkage); }
|
|
bool hasPrivateLinkage() const { return isPrivateLinkage(Linkage); }
|
|
bool hasLinkerPrivateLinkage() const { return isLinkerPrivateLinkage(Linkage); }
|
|
bool hasLocalLinkage() const { return isLocalLinkage(Linkage); }
|
|
bool hasDLLImportLinkage() const { return isDLLImportLinkage(Linkage); }
|
|
bool hasDLLExportLinkage() const { return isDLLExportLinkage(Linkage); }
|
|
bool hasExternalWeakLinkage() const { return isExternalWeakLinkage(Linkage); }
|
|
bool hasCommonLinkage() const { return isCommonLinkage(Linkage); }
|
|
|
|
void setLinkage(LinkageTypes LT) { Linkage = LT; }
|
|
LinkageTypes getLinkage() const { return Linkage; }
|
|
|
|
bool mayBeOverridden() const { return mayBeOverridden(Linkage); }
|
|
|
|
bool isWeakForLinker() const { return isWeakForLinker(Linkage); }
|
|
|
|
/// copyAttributesFrom - copy all additional attributes (those not needed to
|
|
/// create a GlobalValue) from the GlobalValue Src to this one.
|
|
virtual void copyAttributesFrom(const GlobalValue *Src);
|
|
|
|
/// @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.
|
|
/// @{
|
|
|
|
/// isMaterializable - 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;
|
|
|
|
/// isDematerializable - 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;
|
|
|
|
/// Materialize - 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.
|
|
bool Materialize(std::string *ErrInfo = 0);
|
|
|
|
/// Dematerialize - 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. No GlobalValue's are null values so this
|
|
/// always returns false.
|
|
virtual bool isNullValue() const { return false; }
|
|
|
|
/// Override from Constant class.
|
|
virtual void destroyConstant();
|
|
|
|
/// isDeclaration - Return true if the primary definition of this global
|
|
/// value is outside of the current translation unit...
|
|
virtual bool isDeclaration() const = 0;
|
|
|
|
/// removeFromParent - This method unlinks 'this' from the containing module,
|
|
/// but does not delete it.
|
|
virtual void removeFromParent() = 0;
|
|
|
|
/// eraseFromParent - This method unlinks 'this' from the containing module
|
|
/// and deletes it.
|
|
virtual void eraseFromParent() = 0;
|
|
|
|
/// getParent - Get the module that this global value is contained inside
|
|
/// of...
|
|
inline Module *getParent() { return Parent; }
|
|
inline const Module *getParent() const { return Parent; }
|
|
|
|
/// 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 removeDeadConstantUsers() const;
|
|
|
|
// Methods for support type inquiry through isa, cast, and dyn_cast:
|
|
static inline bool classof(const GlobalValue *) { return true; }
|
|
static inline bool classof(const Value *V) {
|
|
return V->getValueID() == Value::FunctionVal ||
|
|
V->getValueID() == Value::GlobalVariableVal ||
|
|
V->getValueID() == Value::GlobalAliasVal;
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|