1//===-- llvm/ValueSymbolTable.h - Implement a Value Symtab ------*- 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 file implements the name/Value symbol table for LLVM.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_IR_VALUESYMBOLTABLE_H
15#define LLVM_IR_VALUESYMBOLTABLE_H
16
17#include "llvm/ADT/SmallString.h"
18#include "llvm/ADT/StringMap.h"
19#include "llvm/IR/Value.h"
20#include "llvm/Support/DataTypes.h"
21
22namespace llvm {
23  template <typename ValueSubClass> class SymbolTableListTraits;
24  class BasicBlock;
25  class Function;
26  class NamedMDNode;
27  class Module;
28  class StringRef;
29
30/// This class provides a symbol table of name/value pairs. It is essentially
31/// a std::map<std::string,Value*> but has a controlled interface provided by
32/// LLVM as well as ensuring uniqueness of names.
33///
34class ValueSymbolTable {
35  friend class Value;
36  friend class SymbolTableListTraits<Argument>;
37  friend class SymbolTableListTraits<BasicBlock>;
38  friend class SymbolTableListTraits<Instruction>;
39  friend class SymbolTableListTraits<Function>;
40  friend class SymbolTableListTraits<GlobalVariable>;
41  friend class SymbolTableListTraits<GlobalAlias>;
42/// @name Types
43/// @{
44public:
45  /// @brief A mapping of names to values.
46  typedef StringMap<Value*> ValueMap;
47
48  /// @brief An iterator over a ValueMap.
49  typedef ValueMap::iterator iterator;
50
51  /// @brief A const_iterator over a ValueMap.
52  typedef ValueMap::const_iterator const_iterator;
53
54/// @}
55/// @name Constructors
56/// @{
57public:
58  ValueSymbolTable() : vmap(0), LastUnique(0) {}
59  ~ValueSymbolTable();
60
61/// @}
62/// @name Accessors
63/// @{
64public:
65  /// This method finds the value with the given \p Name in the
66  /// the symbol table.
67  /// @returns the value associated with the \p Name
68  /// @brief Lookup a named Value.
69  Value *lookup(StringRef Name) const { return vmap.lookup(Name); }
70
71  /// @returns true iff the symbol table is empty
72  /// @brief Determine if the symbol table is empty
73  inline bool empty() const { return vmap.empty(); }
74
75  /// @brief The number of name/type pairs is returned.
76  inline unsigned size() const { return unsigned(vmap.size()); }
77
78  /// This function can be used from the debugger to display the
79  /// content of the symbol table while debugging.
80  /// @brief Print out symbol table on stderr
81  void dump() const;
82
83/// @}
84/// @name Iteration
85/// @{
86public:
87  /// @brief Get an iterator that from the beginning of the symbol table.
88  inline iterator begin() { return vmap.begin(); }
89
90  /// @brief Get a const_iterator that from the beginning of the symbol table.
91  inline const_iterator begin() const { return vmap.begin(); }
92
93  /// @brief Get an iterator to the end of the symbol table.
94  inline iterator end() { return vmap.end(); }
95
96  /// @brief Get a const_iterator to the end of the symbol table.
97  inline const_iterator end() const { return vmap.end(); }
98
99  /// @}
100  /// @name Mutators
101  /// @{
102private:
103  ValueName *makeUniqueName(Value *V, SmallString<256> &UniqueName);
104
105  /// This method adds the provided value \p N to the symbol table.  The Value
106  /// must have a name which is used to place the value in the symbol table.
107  /// If the inserted name conflicts, this renames the value.
108  /// @brief Add a named value to the symbol table
109  void reinsertValue(Value *V);
110
111  /// createValueName - This method attempts to create a value name and insert
112  /// it into the symbol table with the specified name.  If it conflicts, it
113  /// auto-renames the name and returns that instead.
114  ValueName *createValueName(StringRef Name, Value *V);
115
116  /// This method removes a value from the symbol table.  It leaves the
117  /// ValueName attached to the value, but it is no longer inserted in the
118  /// symtab.
119  void removeValueName(ValueName *V);
120
121  /// @}
122  /// @name Internal Data
123  /// @{
124private:
125  ValueMap vmap;                    ///< The map that holds the symbol table.
126  mutable uint32_t LastUnique; ///< Counter for tracking unique names
127
128/// @}
129};
130
131} // End llvm namespace
132
133#endif
134