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//===-- llvm/ValueSymbolTable.h - Implement a Value Symtab ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the name/Value symbol table for LLVM.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_VALUE_SYMBOL_TABLE_H
#define LLVM_VALUE_SYMBOL_TABLE_H
#include "llvm/ADT/StringMap.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {
template<typename ValueSubClass, typename ItemParentClass>
class SymbolTableListTraits;
class BasicBlock;
class Function;
class NamedMDNode;
class Module;
class StringRef;
/// This class provides a symbol table of name/value pairs. It is essentially
/// a std::map<std::string,Value*> but has a controlled interface provided by
/// LLVM as well as ensuring uniqueness of names.
///
class ValueSymbolTable {
friend class Value;
friend class SymbolTableListTraits<Argument, Function>;
friend class SymbolTableListTraits<BasicBlock, Function>;
friend class SymbolTableListTraits<Instruction, BasicBlock>;
friend class SymbolTableListTraits<Function, Module>;
friend class SymbolTableListTraits<GlobalVariable, Module>;
friend class SymbolTableListTraits<GlobalAlias, Module>;
/// @name Types
/// @{
public:
/// @brief A mapping of names to values.
typedef StringMap<Value*> ValueMap;
/// @brief An iterator over a ValueMap.
typedef ValueMap::iterator iterator;
/// @brief A const_iterator over a ValueMap.
typedef ValueMap::const_iterator const_iterator;
/// @}
/// @name Constructors
/// @{
public:
ValueSymbolTable() : vmap(0), LastUnique(0) {}
~ValueSymbolTable();
/// @}
/// @name Accessors
/// @{
public:
/// This method finds the value with the given \p Name in the
/// the symbol table.
/// @returns the value associated with the \p Name
/// @brief Lookup a named Value.
Value *lookup(StringRef Name) const { return vmap.lookup(Name); }
/// @returns true iff the symbol table is empty
/// @brief Determine if the symbol table is empty
inline bool empty() const { return vmap.empty(); }
/// @brief The number of name/type pairs is returned.
inline unsigned size() const { return unsigned(vmap.size()); }
/// This function can be used from the debugger to display the
/// content of the symbol table while debugging.
/// @brief Print out symbol table on stderr
void dump() const;
/// @}
/// @name Iteration
/// @{
public:
/// @brief Get an iterator that from the beginning of the symbol table.
inline iterator begin() { return vmap.begin(); }
/// @brief Get a const_iterator that from the beginning of the symbol table.
inline const_iterator begin() const { return vmap.begin(); }
/// @brief Get an iterator to the end of the symbol table.
inline iterator end() { return vmap.end(); }
/// @brief Get a const_iterator to the end of the symbol table.
inline const_iterator end() const { return vmap.end(); }
/// @}
/// @name Mutators
/// @{
private:
/// This method adds the provided value \p N to the symbol table. The Value
/// must have a name which is used to place the value in the symbol table.
/// If the inserted name conflicts, this renames the value.
/// @brief Add a named value to the symbol table
void reinsertValue(Value *V);
/// createValueName - This method attempts to create a value name and insert
/// it into the symbol table with the specified name. If it conflicts, it
/// auto-renames the name and returns that instead.
ValueName *createValueName(StringRef Name, Value *V);
/// This method removes a value from the symbol table. It leaves the
/// ValueName attached to the value, but it is no longer inserted in the
/// symtab.
void removeValueName(ValueName *V);
/// @}
/// @name Internal Data
/// @{
private:
ValueMap vmap; ///< The map that holds the symbol table.
mutable uint32_t LastUnique; ///< Counter for tracking unique names
/// @}
};
} // End llvm namespace
#endif
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