lib/Bitcode/Writer/ValueEnumerator.h

   1 //===-- Bitcode/Writer/ValueEnumerator.h - Number values --------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This class gives values and types Unique ID's.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef VALUE_ENUMERATOR_H
  15 #define VALUE_ENUMERATOR_H
  16
  17 #include "llvm/ADT/DenseMap.h"
  18 #include "llvm/Attributes.h"
  19 #include <vector>
  20
  21 namespace llvm {
  22
  23 class Type;
  24 class Value;
  25 class BasicBlock;
  26 class Function;
  27 class Module;
  28 class AttrListPtr;
  29 class TypeSymbolTable;
  30 class ValueSymbolTable;
  31
  32 class ValueEnumerator {
  33 public:
  34   // For each type, we remember its Type* and occurrence frequency.
  35   typedef std::vector<std::pair<const Type*, unsigned> > TypeList;
  36
  37   // For each value, we remember its Value* and occurrence frequency.
  38   typedef std::vector<std::pair<const Value*, unsigned> > ValueList;
  39 private:
  40   typedef DenseMap<const Type*, unsigned> TypeMapType;
  41   TypeMapType TypeMap;
  42   TypeList Types;
  43
  44   typedef DenseMap<const Value*, unsigned> ValueMapType;
  45   ValueMapType ValueMap;
  46   ValueList Values;
  47
  48   typedef DenseMap<void*, unsigned> AttributeMapType;
  49   AttributeMapType AttributeMap;
  50   std::vector<AttrListPtr> Attributes;
  51
  52   /// BasicBlocks - This contains all the basic blocks for the currently
  53   /// incorporated function.  Their reverse mapping is stored in ValueMap.
  54   std::vector<const BasicBlock*> BasicBlocks;
  55
  56   /// When a function is incorporated, this is the size of the Values list
  57   /// before incorporation.
  58   unsigned NumModuleValues;
  59   unsigned FirstFuncConstantID;
  60   unsigned FirstInstID;
  61
  62   ValueEnumerator(const ValueEnumerator &);  // DO NOT IMPLEMENT
  63   void operator=(const ValueEnumerator &);   // DO NOT IMPLEMENT
  64 public:
  65   ValueEnumerator(const Module *M);
  66
  67   unsigned getValueID(const Value *V) const {
  68     ValueMapType::const_iterator I = ValueMap.find(V);
  69     assert(I != ValueMap.end() && "Value not in slotcalculator!");
  70     return I->second-1;
  71   }
  72
  73   unsigned getTypeID(const Type *T) const {
  74     TypeMapType::const_iterator I = TypeMap.find(T);
  75     assert(I != TypeMap.end() && "Type not in ValueEnumerator!");
  76     return I->second-1;
  77   }
  78
  79   unsigned getAttributeID(const AttrListPtr &PAL) const {
  80     if (PAL.isEmpty()) return 0;  // Null maps to zero.
  81     AttributeMapType::const_iterator I = AttributeMap.find(PAL.getRawPointer());
  82     assert(I != AttributeMap.end() && "Attribute not in ValueEnumerator!");
  83     return I->second;
  84   }
  85
  86   /// getFunctionConstantRange - Return the range of values that corresponds to
  87   /// function-local constants.
  88   void getFunctionConstantRange(unsigned &Start, unsigned &End) const {
  89     Start = FirstFuncConstantID;
  90     End = FirstInstID;
  91   }
  92
  93   const ValueList &getValues() const { return Values; }
  94   const TypeList &getTypes() const { return Types; }
  95   const std::vector<const BasicBlock*> &getBasicBlocks() const {
  96     return BasicBlocks;
  97   }
  98   const std::vector<AttrListPtr> &getAttributes() const {
  99     return Attributes;
 100   }
 101
 102   /// PurgeAggregateValues - If there are any aggregate values at the end of the
 103   /// value list, remove them and return the count of the remaining values.  If
 104   /// there are none, return -1.
 105   int PurgeAggregateValues();
 106
 107   /// incorporateFunction/purgeFunction - If you'd like to deal with a function,
 108   /// use these two methods to get its data into the ValueEnumerator!
 109   ///
 110   void incorporateFunction(const Function &F);
 111   void purgeFunction();
 112
 113 private:
 114   void OptimizeConstants(unsigned CstStart, unsigned CstEnd);
 115
 116   void EnumerateValue(const Value *V);
 117   void EnumerateType(const Type *T);
 118   void EnumerateOperandType(const Value *V);
 119   void EnumerateAttributes(const AttrListPtr &PAL);
 120
 121   void EnumerateTypeSymbolTable(const TypeSymbolTable &ST);
 122   void EnumerateValueSymbolTable(const ValueSymbolTable &ST);
 123 };
 124
 125 } // End llvm namespace
 126
 127 #endif