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+//===-- llvm/Constant.h - Constant class definition -------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the Constant class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_CONSTANT_H
+#define LLVM_IR_CONSTANT_H
+
+#include "llvm/IR/User.h"
+#include "llvm/IR/Value.h"
+#include "llvm/Support/Casting.h"
+
+namespace llvm {
+
+class APInt;
+
+/// This is an important base class in LLVM. It provides the common facilities
+/// of all constant values in an LLVM program. A constant is a value that is
+/// immutable at runtime. Functions are constants because their address is
+/// immutable. Same with global variables.
+///
+/// All constants share the capabilities provided in this class. All constants
+/// can have a null value. They can have an operand list. Constants can be
+/// simple (integer and floating point values), complex (arrays and structures),
+/// or expression based (computations yielding a constant value composed of
+/// only certain operators and other constant values).
+///
+/// Note that Constants are immutable (once created they never change)
+/// and are fully shared by structural equivalence.  This means that two
+/// structurally equivalent constants will always have the same address.
+/// Constants are created on demand as needed and never deleted: thus clients
+/// don't have to worry about the lifetime of the objects.
+/// LLVM Constant Representation
+class Constant : public User {
+protected:
+  Constant(Type *ty, ValueTy vty, Use *Ops, unsigned NumOps)
+    : User(ty, vty, Ops, NumOps) {}
+
+public:
+  void operator=(const Constant &) = delete;
+  Constant(const Constant &) = delete;
+
+  /// Return true if this is the value that would be returned by getNullValue.
+  bool isNullValue() const;
+
+  /// Returns true if the value is one.
+  bool isOneValue() const;
+
+  /// Return true if this is the value that would be returned by
+  /// getAllOnesValue.
+  bool isAllOnesValue() const;
+
+  /// Return true if the value is what would be returned by
+  /// getZeroValueForNegation.
+  bool isNegativeZeroValue() const;
+
+  /// Return true if the value is negative zero or null value.
+  bool isZeroValue() const;
+
+  /// Return true if the value is not the smallest signed value.
+  bool isNotMinSignedValue() const;
+
+  /// Return true if the value is the smallest signed value.
+  bool isMinSignedValue() const;
+
+  /// Return true if this is a finite and non-zero floating-point scalar
+  /// constant or a vector constant with all finite and non-zero elements.
+  bool isFiniteNonZeroFP() const;
+
+  /// Return true if this is a normal (as opposed to denormal) floating-point
+  /// scalar constant or a vector constant with all normal elements.
+  bool isNormalFP() const;
+
+  /// Return true if this scalar has an exact multiplicative inverse or this
+  /// vector has an exact multiplicative inverse for each element in the vector.
+  bool hasExactInverseFP() const;
+
+  /// Return true if this is a floating-point NaN constant or a vector
+  /// floating-point constant with all NaN elements.
+  bool isNaN() const;
+
+  /// Return true if this is a vector constant that includes any undefined
+  /// elements.
+  bool containsUndefElement() const;
+
+  /// Return true if evaluation of this constant could trap. This is true for
+  /// things like constant expressions that could divide by zero.
+  bool canTrap() const;
+
+  /// Return true if the value can vary between threads.
+  bool isThreadDependent() const;
+
+  /// Return true if the value is dependent on a dllimport variable.
+  bool isDLLImportDependent() const;
+
+  /// Return true if the constant has users other than constant expressions and
+  /// other dangling things.
+  bool isConstantUsed() const;
+
+  /// This method classifies the entry according to whether or not it may
+  /// generate a relocation entry.  This must be conservative, so if it might
+  /// codegen to a relocatable entry, it should say so.
+  ///
+  /// FIXME: This really should not be in IR.
+  bool needsRelocation() const;
+
+  /// For aggregates (struct/array/vector) return the constant that corresponds
+  /// to the specified element if possible, or null if not. This can return null
+  /// if the element index is a ConstantExpr, if 'this' is a constant expr or
+  /// if the constant does not fit into an uint64_t.
+  Constant *getAggregateElement(unsigned Elt) const;
+  Constant *getAggregateElement(Constant *Elt) const;
+
+  /// If this is a splat vector constant, meaning that all of the elements have
+  /// the same value, return that value. Otherwise return 0.
+  Constant *getSplatValue() const;
+
+  /// If C is a constant integer then return its value, otherwise C must be a
+  /// vector of constant integers, all equal, and the common value is returned.
+  const APInt &getUniqueInteger() const;
+
+  /// 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 implement
+  /// destroyConstantImpl to remove constants from any pools/maps they are
+  /// contained it.
+  void destroyConstant();
+
+  //// Methods for support type inquiry through isa, cast, and dyn_cast:
+  static bool classof(const Value *V) {
+    static_assert(ConstantFirstVal == 0, "V->getValueID() >= ConstantFirstVal always succeeds");
+    return V->getValueID() <= ConstantLastVal;
+  }
+
+  /// 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.
+  ///
+  void handleOperandChange(Value *, Value *);
+
+  static Constant *getNullValue(Type* Ty);
+
+  /// @returns the value for an integer or vector of integer constant of the
+  /// given type that has all its bits set to true.
+  /// Get the all ones value
+  static Constant *getAllOnesValue(Type* Ty);
+
+  /// Return the value for an integer or pointer constant, or a vector thereof,
+  /// with the given scalar value.
+  static Constant *getIntegerValue(Type *Ty, const APInt &V);
+
+  /// If there are any dead constant users dangling off of this constant, 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;
+
+  const Constant *stripPointerCasts() const {
+    return cast<Constant>(Value::stripPointerCasts());
+  }
+
+  Constant *stripPointerCasts() {
+    return const_cast<Constant*>(
+                      static_cast<const Constant *>(this)->stripPointerCasts());
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_IR_CONSTANT_H