X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FConstant.h;h=bfe65a6faa1549278cccd3d71e94c8c04a7041a3;hb=a727d5502c8e23c090da658bf14c5ebc1169a070;hp=112cb4d2abcfcf4d2c015fd53138c593758ffb6c;hpb=d0478744b3b5232694d0f887b3210078de5266c4;p=oota-llvm.git

diff --git a/include/llvm/Constant.h b/include/llvm/Constant.h
index 112cb4d2abc..bfe65a6faa1 100644
--- a/include/llvm/Constant.h
+++ b/include/llvm/Constant.h
@@ -1,10 +1,10 @@
 //===-- 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.
@@ -18,17 +18,32 @@
 
 namespace llvm {
 
+/// 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.  
+/// Constant's 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 {
+  void operator=(const Constant &);     // Do not implement
+  Constant(const Constant &);           // Do not implement
 protected:
-  Constant(const Type *Ty, ValueTy vty, Use *Ops, unsigned NumOps,
-           const std::string& Name = "")
-    : User(Ty, vty, Ops, NumOps, Name) {}
+  Constant(const Type *Ty, ValueTy vty, Use *Ops, unsigned NumOps)
+    : User(Ty, vty, Ops, NumOps) {}
 
   void destroyConstantImpl();
 public:
-  // setName - Specialize setName to handle symbol table majik.
-  virtual void setName(const std::string &name);
-
   /// Static constructor to get a '0' constant of arbitrary type...
   ///
   static Constant *getNullValue(const Type *Ty);
@@ -38,10 +53,19 @@ public:
   virtual bool isNullValue() const = 0;
 
   virtual void print(std::ostream &O) const;
+  void print(std::ostream *O) const { if (O) print(*O); }
+  
+  /// 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;
+
+  /// ContaintsRelocations - Return true if the constant value contains
+  /// relocations which cannot be resolved at compile time.
+  bool ContainsRelocations() const;
 
   // Specialize get/setOperand for Constant's as their operands are always
   // constants as well.
-  Constant *getOperand(unsigned i) { 
+  Constant *getOperand(unsigned i) {
     return static_cast<Constant*>(User::getOperand(i));
   }
   const Constant *getOperand(unsigned i) const {
@@ -59,17 +83,13 @@ public:
   /// destroyConstantImpl as the last thing they do, to destroy all users and
   /// delete this.
   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 GlobalValue *) { return true; }
   static inline bool classof(const Value *V) {
-    return V->getValueType() == Value::SimpleConstantVal ||
-           V->getValueType() == Value::ConstantExprVal ||
-           V->getValueType() == Value::ConstantAggregateZeroVal ||
-           V->getValueType() == Value::FunctionVal ||
-           V->getValueType() == Value::GlobalVariableVal ||
-           V->getValueType() == Value::UndefValueVal;
+    return V->getValueID() >= ConstantFirstVal &&
+           V->getValueID() <= ConstantLastVal;
   }
 
   /// replaceUsesOfWithOnConstant - This method is a special form of
@@ -82,8 +102,7 @@ public:
   /// use Value::replaceAllUsesWith, which automatically dispatches to this
   /// method as needed.
   ///
-  virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
-                                           bool DisableChecking = false) {
+  virtual void replaceUsesOfWithOnConstant(Value *, Value *, Use *) {
     // 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.
@@ -92,10 +111,12 @@ public:
     assert(0 && "Constants that do not have operands cannot be using 'From'!");
   }
 
-  /// clearAllValueMaps - This method frees all internal memory used by the
-  /// constant subsystem, which can be used in environments where this memory
-  /// is otherwise reported as a leak.
-  static void clearAllValueMaps();
+  /// getStringValue - Turn an LLVM constant pointer that eventually points to a
+  /// global into a string value.  Return an empty string if we can't do it.
+  /// Parameter Chop determines if the result is chopped at the first null
+  /// terminator.
+  ///
+  std::string getStringValue(bool Chop = true, unsigned Offset = 0);
 };
 
 } // End llvm namespace