X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FMachineConstantPool.h;h=ba491ce2556cdefe28eb368db4ea4a22d83a54d0;hb=5eca075b74d62c621b160aa216b4cd50829a2cc7;hp=bccb1467a4408df34c600c456018429d036281d6;hpb=a69571c7991813c93cba64e88eced6899ce93d81;p=oota-llvm.git

diff --git a/include/llvm/CodeGen/MachineConstantPool.h b/include/llvm/CodeGen/MachineConstantPool.h
index bccb1467a44..ba491ce2556 100644
--- a/include/llvm/CodeGen/MachineConstantPool.h
+++ b/include/llvm/CodeGen/MachineConstantPool.h
@@ -2,51 +2,122 @@
 //
 //                     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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
-// The MachineConstantPool class keeps track of constants referenced by a
-// function which must be spilled to memory.  This is used for constants which
-// are unable to be used directly as operands to instructions, which typically
-// include floating point and large integer constants.
-//
-// Instructions reference the address of these constant pool constants through
-// the use of MO_ConstantPoolIndex values.  When emitting assembly or machine
-// code, these virtual address references are converted to refer to the
-// address of the function constant pool values.
+/// @file This file declares the MachineConstantPool class which is an abstract
+/// constant pool to keep track of constants referenced by a function.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CODEGEN_MACHINECONSTANTPOOL_H
 #define LLVM_CODEGEN_MACHINECONSTANTPOOL_H
 
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/Support/Streams.h"
+#include <cassert>
 #include <vector>
 #include <iosfwd>
 
 namespace llvm {
 
+class AsmPrinter;
 class Constant;
 class TargetData;
+class TargetMachine;
+class Type;
+class MachineConstantPool;
 
-/// MachineConstantPoolEntry - One entry in the constant pool.
+/// Abstract base class for all machine specific constantpool value subclasses.
 ///
-struct MachineConstantPoolEntry {
-  /// Val - The constant itself.
-  Constant *Val;
-  /// Offset - The offset of the constant from the start of the constant pool.
+class MachineConstantPoolValue {
+  const Type *Ty;
+
+public:
+  explicit MachineConstantPoolValue(const Type *ty) : Ty(ty) {}
+  virtual ~MachineConstantPoolValue() {}
+
+  /// getType - get type of this MachineConstantPoolValue.
+  ///
+  inline const Type *getType() const { return Ty; }
+
+  virtual int getExistingMachineCPValue(MachineConstantPool *CP,
+                                        unsigned Alignment) = 0;
+
+  virtual void AddSelectionDAGCSEId(FoldingSetNodeID &ID) = 0;
+
+  /// print - Implement operator<<...
+  ///
+  virtual void print(std::ostream &O) const = 0;
+  void print(std::ostream *O) const { if (O) print(*O); }
+};
+
+inline std::ostream &operator<<(std::ostream &OS,
+                                const MachineConstantPoolValue &V) {
+  V.print(OS);
+  return OS;
+}
+
+/// This class is a data container for one entry in a MachineConstantPool.
+/// It contains a pointer to the value and an offset from the start of
+/// the constant pool.
+/// @brief An entry in a MachineConstantPool
+class MachineConstantPoolEntry {
+public:
+  /// The constant itself.
+  union {
+    Constant *ConstVal;
+    MachineConstantPoolValue *MachineCPVal;
+  } Val;
+
+  /// The offset of the constant from the start of the pool. The top bit is set
+  /// when Val is a MachineConstantPoolValue.
   unsigned Offset;
-  
-  MachineConstantPoolEntry(Constant *V, unsigned O) : Val(V), Offset(O) {}
+
+  MachineConstantPoolEntry(Constant *V, unsigned O)
+    : Offset(O) {
+    assert((int)Offset >= 0 && "Offset is too large");
+    Val.ConstVal = V;
+  }
+  MachineConstantPoolEntry(MachineConstantPoolValue *V, unsigned O)
+    : Offset(O){
+    assert((int)Offset >= 0 && "Offset is too large");
+    Val.MachineCPVal = V; 
+    Offset |= 1 << (sizeof(unsigned)*8-1);
+  }
+
+  bool isMachineConstantPoolEntry() const {
+    return (int)Offset < 0;
+  }
+
+  int getOffset() const { 
+    return Offset & ~(1 << (sizeof(unsigned)*8-1));
+  }
+
+  const Type *getType() const;
 };
   
+/// The MachineConstantPool class keeps track of constants referenced by a
+/// function which must be spilled to memory.  This is used for constants which
+/// are unable to be used directly as operands to instructions, which typically
+/// include floating point and large integer constants.
+///
+/// Instructions reference the address of these constant pool constants through
+/// the use of MO_ConstantPoolIndex values.  When emitting assembly or machine
+/// code, these virtual address references are converted to refer to the
+/// address of the function constant pool values.
+/// @brief The machine constant pool.
 class MachineConstantPool {
-  const TargetData *TD;
-  unsigned PoolAlignment;
-  std::vector<MachineConstantPoolEntry> Constants;
+  const TargetData *TD;   ///< The machine's TargetData.
+  unsigned PoolAlignment; ///< The alignment for the pool.
+  std::vector<MachineConstantPoolEntry> Constants; ///< The pool of constants.
 public:
-  MachineConstantPool(const TargetData *td) : TD(td), PoolAlignment(1) {}
+  /// @brief The only constructor.
+  explicit MachineConstantPool(const TargetData *td)
+    : TD(td), PoolAlignment(1) {}
+  ~MachineConstantPool();
     
   /// getConstantPoolAlignment - Return the log2 of the alignment required by
   /// the whole constant pool, of which the first element must be aligned.
@@ -54,11 +125,10 @@ public:
   
   /// getConstantPoolIndex - Create a new entry in the constant pool or return
   /// an existing one.  User must specify an alignment in bytes for the object.
-  ///
   unsigned getConstantPoolIndex(Constant *C, unsigned Alignment);
+  unsigned getConstantPoolIndex(MachineConstantPoolValue *V,unsigned Alignment);
   
   /// isEmpty - Return true if this constant pool contains no constants.
-  ///
   bool isEmpty() const { return Constants.empty(); }
 
   const std::vector<MachineConstantPoolEntry> &getConstants() const {
@@ -69,6 +139,7 @@ public:
   /// constant pool objects.  Implemented in MachineFunction.cpp
   ///
   void print(std::ostream &OS) const;
+  void print(std::ostream *OS) const { if (OS) print(*OS); }
 
   /// dump - Call print(std::cerr) to be called from the debugger.
   ///