mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 20:23:11 +01:00
93 lines
3.7 KiB
C++
93 lines
3.7 KiB
C++
//===-- llvm/Constant.h - Constant class definition -------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains the declaration of the Constant class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CONSTANT_H
|
|
#define LLVM_CONSTANT_H
|
|
|
|
#include "llvm/User.h"
|
|
|
|
namespace llvm {
|
|
|
|
class Constant : public User {
|
|
protected:
|
|
inline Constant(const Type *Ty) : User(Ty, Value::ConstantVal) {}
|
|
~Constant() {}
|
|
|
|
void destroyConstantImpl();
|
|
public:
|
|
// setName - Specialize setName to handle symbol table majik...
|
|
virtual void setName(const std::string &name, SymbolTable *ST = 0);
|
|
|
|
/// Static constructor to get a '0' constant of arbitrary type...
|
|
///
|
|
static Constant *getNullValue(const Type *Ty);
|
|
|
|
/// isNullValue - Return true if this is the value that would be returned by
|
|
/// getNullValue.
|
|
virtual bool isNullValue() const = 0;
|
|
|
|
virtual void print(std::ostream &O) const;
|
|
|
|
/// isConstantExpr - Return true if this is a ConstantExpr
|
|
///
|
|
virtual bool isConstantExpr() const { return false; }
|
|
|
|
|
|
/// destroyConstant - Called if some element of this constant is no longer
|
|
/// valid. At this point only other constants may be on the use_list for this
|
|
/// constant. Any constants on our Use list must also be destroy'd. The
|
|
/// implementation must be sure to remove the constant from the list of
|
|
/// available cached constants. Implementations should call
|
|
/// destroyConstantImpl as the last thing they do, to destroy all users and
|
|
/// delete this.
|
|
///
|
|
/// Note that this call is only valid on non-primitive constants: You cannot
|
|
/// destroy an integer constant for example. This API is used to delete
|
|
/// constants that have ConstantPointerRef's embeded in them when the module
|
|
/// is deleted, and it is used by GlobalDCE to remove ConstantPointerRefs that
|
|
/// are unneeded, allowing globals to be DCE'd.
|
|
///
|
|
virtual void destroyConstant() { assert(0 && "Not reached!"); }
|
|
|
|
|
|
//// Methods for support type inquiry through isa, cast, and dyn_cast:
|
|
static inline bool classof(const Constant *) { return true; }
|
|
static inline bool classof(const Value *V) {
|
|
return V->getValueType() == Value::ConstantVal;
|
|
}
|
|
|
|
/// replaceUsesOfWithOnConstant - This method is a special form of
|
|
/// User::replaceUsesOfWith (which does not work on constants) that does work
|
|
/// on constants. Basically this method goes through the trouble of building
|
|
/// a new constant that is equivalent to the current one, with all uses of
|
|
/// From replaced with uses of To. After this construction is completed, all
|
|
/// of the users of 'this' are replaced to use the new constant, and then
|
|
/// 'this' is deleted. In general, you should not call this method, instead,
|
|
/// use Value::replaceAllUsesWith, which automatically dispatches to this
|
|
/// method as needed.
|
|
///
|
|
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
|
|
bool DisableChecking = false) {
|
|
// Provide a default implementation for constants (like integers) that
|
|
// cannot use any other values. This cannot be called at runtime, but needs
|
|
// to be here to avoid link errors.
|
|
assert(getNumOperands() == 0 && "replaceUsesOfWithOnConstant must be "
|
|
"implemented for all constants that have operands!");
|
|
assert(0 && "Constants that do not have operands cannot be using 'From'!");
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|