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+//===-- llvm/Constant.h - Constant class definition -------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file 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_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.
+/// @brief 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 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, or if 'this' is a constant expr.
+ 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.
+ /// @brief 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