Increment debug info version to accommodate upcoming change in debug info node structure.

[oota-llvm.git] / include / llvm / Constant.h

diff --git a/include/llvm/Constant.h b/include/llvm/Constant.h
index 4314b2c026f25b013114443ceaf558e73715ef09..601b37bb64e4df165db1a12111b1d1d953de845f 100644 (file)
--- a/include/llvm/Constant.h
+++ b/include/llvm/Constant.h
@@ -17,8 +17,9 @@
 #include "llvm/User.h"
 
 namespace llvm {
+  class APInt;
+
   template<typename T> class SmallVectorImpl;
-  class LLVMContext;
 
 /// 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
@@ -42,56 +43,54 @@ class Constant : public User {
   Constant(const Constant &);           // Do not implement
   
 protected:
-  Constant(const Type *ty, ValueTy vty, Use *Ops, unsigned NumOps)
+  Constant(Type *ty, ValueTy vty, Use *Ops, unsigned NumOps)
     : User(ty, vty, Ops, NumOps) {}
 
   void destroyConstantImpl();
 public:
   /// isNullValue - Return true if this is the value that would be returned by
   /// getNullValue.
-  virtual bool isNullValue() const = 0;
+  bool isNullValue() const;
 
   /// isNegativeZeroValue - Return true if the value is what would be returned 
   /// by getZeroValueForNegation.
-  virtual bool isNegativeZeroValue() const { return isNullValue(); }
+  bool isNegativeZeroValue() const;
 
   /// canTrap - 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;
 
+  /// isConstantUsed - Return true if the constant has users other than constant
+  /// exprs and other dangling things.
+  bool isConstantUsed() const;
+  
+  enum PossibleRelocationsTy {
+    NoRelocation = 0,
+    LocalRelocation = 1,
+    GlobalRelocations = 2
+  };
+  
   /// getRelocationInfo - 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.  The return values are:
   /// 
-  ///  0: This constant pool entry is guaranteed to never have a relocation
-  ///     applied to it (because it holds a simple constant like '4').
-  ///  1: This entry has relocations, but the entries are guaranteed to be
-  ///     resolvable by the static linker, so the dynamic linker will never see
-  ///     them.
-  ///  2: This entry may have arbitrary relocations.
+  ///  NoRelocation: This constant pool entry is guaranteed to never have a
+  ///     relocation applied to it (because it holds a simple constant like
+  ///     '4').
+  ///  LocalRelocation: This entry has relocations, but the entries are
+  ///     guaranteed to be resolvable by the static linker, so the dynamic
+  ///     linker will never see them.
+  ///  GlobalRelocations: This entry may have arbitrary relocations.
   ///
   /// FIXME: This really should not be in VMCore.
-  unsigned getRelocationInfo() const;
-  
-  // Specialize get/setOperand for Constants as their operands are always
-  // constants as well.
-  Constant *getOperand(unsigned i) {
-    return static_cast<Constant*>(User::getOperand(i));
-  }
-  const Constant *getOperand(unsigned i) const {
-    return static_cast<const Constant*>(User::getOperand(i));
-  }
-  void setOperand(unsigned i, Constant *C) {
-    User::setOperand(i, C);
-  }
+  PossibleRelocationsTy getRelocationInfo() const;
   
   /// getVectorElements - This method, which is only valid on constant of vector
   /// type, returns the elements of the vector in the specified smallvector.
   /// This handles breaking down a vector undef into undef elements, etc.  For
   /// constant exprs and other cases we can't handle, we return an empty vector.
-  void getVectorElements(LLVMContext &Context, 
-                         SmallVectorImpl<Constant*> &Elts) const;
+  void getVectorElements(SmallVectorImpl<Constant*> &Elts) const;
 
   /// 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
@@ -128,6 +127,23 @@ public:
            "implemented for all constants that have operands!");
     assert(0 && "Constants that do not have operands cannot be using 'From'!");
   }
+  
+  static Constant *getNullValue(Type* Ty);
+  
+  /// @returns the value for an 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);
+
+  /// getIntegerValue - 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);
+  
+  /// removeDeadConstantUsers - 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;
 };
 
 } // End llvm namespace