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/ADT/SmallVector.h"
  19 #include "llvm/Attributes.h"
  20 #include <vector>
  21
  22 namespace llvm {
  23
  24 class Type;
  25 class Value;
  26 class Instruction;
  27 class BasicBlock;
  28 class Function;
  29 class Module;
  30 class MDNode;
  31 class NamedMDNode;
  32 class AttrListPtr;
  33 class TypeSymbolTable;
  34 class ValueSymbolTable;
  35 class MDSymbolTable;
  36
  37 class ValueEnumerator {
  38 public:
  39   // For each type, we remember its Type* and occurrence frequency.
  40   typedef std::vector<std::pair<const Type*, unsigned> > TypeList;
  41
  42   // For each value, we remember its Value* and occurrence frequency.
  43   typedef std::vector<std::pair<const Value*, unsigned> > ValueList;
  44 private:
  45   typedef DenseMap<const Type*, unsigned> TypeMapType;
  46   TypeMapType TypeMap;
  47   TypeList Types;
  48
  49   typedef DenseMap<const Value*, unsigned> ValueMapType;
  50   ValueMapType ValueMap;
  51   ValueList Values;
  52   ValueList MDValues;
  53   SmallVector<const MDNode *, 8> FunctionLocalMDs;
  54   ValueMapType MDValueMap;
  55
  56   typedef DenseMap<void*, unsigned> AttributeMapType;
  57   AttributeMapType AttributeMap;
  58   std::vector<AttrListPtr> Attributes;
  59
  60   /// GlobalBasicBlockIDs - This map memoizes the basic block ID's referenced by
  61   /// the "getGlobalBasicBlockID" method.
  62   mutable DenseMap<const BasicBlock*, unsigned> GlobalBasicBlockIDs;
  63
  64   typedef DenseMap<const Instruction*, unsigned> InstructionMapType;
  65   InstructionMapType InstructionMap;
  66   unsigned InstructionCount;
  67
  68   /// BasicBlocks - This contains all the basic blocks for the currently
  69   /// incorporated function.  Their reverse mapping is stored in ValueMap.
  70   std::vector<const BasicBlock*> BasicBlocks;
  71
  72   /// When a function is incorporated, this is the size of the Values list
  73   /// before incorporation.
  74   unsigned NumModuleValues;
  75
  76   /// When a function is incorporated, this is the size of the MDValues list
  77   /// before incorporation.
  78   unsigned NumModuleMDValues;
  79
  80   unsigned FirstFuncConstantID;
  81   unsigned FirstInstID;
  82
  83   ValueEnumerator(const ValueEnumerator &);  // DO NOT IMPLEMENT
  84   void operator=(const ValueEnumerator &);   // DO NOT IMPLEMENT
  85 public:
  86   ValueEnumerator(const Module *M);
  87
  88   unsigned getValueID(const Value *V) const;
  89
  90   unsigned getTypeID(const Type *T) const {
  91     TypeMapType::const_iterator I = TypeMap.find(T);
  92     assert(I != TypeMap.end() && "Type not in ValueEnumerator!");
  93     return I->second-1;
  94   }
  95
  96   unsigned getInstructionID(const Instruction *I) const;
  97   void setInstructionID(const Instruction *I);
  98
  99   unsigned getAttributeID(const AttrListPtr &PAL) const {
 100     if (PAL.isEmpty()) return 0;  // Null maps to zero.
 101     AttributeMapType::const_iterator I = AttributeMap.find(PAL.getRawPointer());
 102     assert(I != AttributeMap.end() && "Attribute not in ValueEnumerator!");
 103     return I->second;
 104   }
 105
 106   /// getFunctionConstantRange - Return the range of values that corresponds to
 107   /// function-local constants.
 108   void getFunctionConstantRange(unsigned &Start, unsigned &End) const {
 109     Start = FirstFuncConstantID;
 110     End = FirstInstID;
 111   }
 112
 113   const ValueList &getValues() const { return Values; }
 114   const ValueList &getMDValues() const { return MDValues; }
 115   const SmallVector<const MDNode *, 8> &getFunctionLocalMDValues() const {
 116     return FunctionLocalMDs;
 117   }
 118   const TypeList &getTypes() const { return Types; }
 119   const std::vector<const BasicBlock*> &getBasicBlocks() const {
 120     return BasicBlocks;
 121   }
 122   const std::vector<AttrListPtr> &getAttributes() const {
 123     return Attributes;
 124   }
 125
 126   /// getGlobalBasicBlockID - This returns the function-specific ID for the
 127   /// specified basic block.  This is relatively expensive information, so it
 128   /// should only be used by rare constructs such as address-of-label.
 129   unsigned getGlobalBasicBlockID(const BasicBlock *BB) const;
 130
 131   /// incorporateFunction/purgeFunction - If you'd like to deal with a function,
 132   /// use these two methods to get its data into the ValueEnumerator!
 133   ///
 134   void incorporateFunction(const Function &F);
 135   void purgeFunction();
 136
 137 private:
 138   void OptimizeConstants(unsigned CstStart, unsigned CstEnd);
 139
 140   void EnumerateMDNodeOperands(const MDNode *N);
 141   void EnumerateMetadata(const Value *MD);
 142   void EnumerateFunctionLocalMetadata(const MDNode *N);
 143   void EnumerateNamedMDNode(const NamedMDNode *NMD);
 144   void EnumerateValue(const Value *V);
 145   void EnumerateType(const Type *T);
 146   void EnumerateOperandType(const Value *V);
 147   void EnumerateAttributes(const AttrListPtr &PAL);
 148
 149   void EnumerateTypeSymbolTable(const TypeSymbolTable &ST);
 150   void EnumerateValueSymbolTable(const ValueSymbolTable &ST);
 151   void EnumerateNamedMetadata(const Module *M);
 152 };
 153
 154 } // End llvm namespace
 155
 156 #endif