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140 lines
4.3 KiB
C++
140 lines
4.3 KiB
C++
//===- llvm/ValueSymbolTable.h - Implement a Value Symtab -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the name/Value symbol table for LLVM.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_VALUESYMBOLTABLE_H
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#define LLVM_IR_VALUESYMBOLTABLE_H
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/Value.h"
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#include <cstdint>
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namespace llvm {
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class Argument;
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class BasicBlock;
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class Function;
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class GlobalAlias;
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class GlobalIFunc;
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class GlobalVariable;
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class Instruction;
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template <unsigned InternalLen> class SmallString;
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template <typename ValueSubClass> class SymbolTableListTraits;
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/// This class provides a symbol table of name/value pairs. It is essentially
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/// a std::map<std::string,Value*> but has a controlled interface provided by
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/// LLVM as well as ensuring uniqueness of names.
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///
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class ValueSymbolTable {
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friend class SymbolTableListTraits<Argument>;
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friend class SymbolTableListTraits<BasicBlock>;
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friend class SymbolTableListTraits<Function>;
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friend class SymbolTableListTraits<GlobalAlias>;
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friend class SymbolTableListTraits<GlobalIFunc>;
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friend class SymbolTableListTraits<GlobalVariable>;
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friend class SymbolTableListTraits<Instruction>;
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friend class Value;
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/// @name Types
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/// @{
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public:
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/// @brief A mapping of names to values.
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using ValueMap = StringMap<Value*>;
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/// @brief An iterator over a ValueMap.
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using iterator = ValueMap::iterator;
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/// @brief A const_iterator over a ValueMap.
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using const_iterator = ValueMap::const_iterator;
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/// @}
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/// @name Constructors
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/// @{
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ValueSymbolTable() : vmap(0) {}
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~ValueSymbolTable();
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/// @}
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/// @name Accessors
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/// @{
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/// This method finds the value with the given \p Name in the
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/// the symbol table.
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/// @returns the value associated with the \p Name
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/// @brief Lookup a named Value.
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Value *lookup(StringRef Name) const { return vmap.lookup(Name); }
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/// @returns true iff the symbol table is empty
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/// @brief Determine if the symbol table is empty
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inline bool empty() const { return vmap.empty(); }
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/// @brief The number of name/type pairs is returned.
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inline unsigned size() const { return unsigned(vmap.size()); }
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/// This function can be used from the debugger to display the
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/// content of the symbol table while debugging.
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/// @brief Print out symbol table on stderr
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void dump() const;
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/// @}
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/// @name Iteration
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/// @{
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/// @brief Get an iterator that from the beginning of the symbol table.
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inline iterator begin() { return vmap.begin(); }
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/// @brief Get a const_iterator that from the beginning of the symbol table.
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inline const_iterator begin() const { return vmap.begin(); }
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/// @brief Get an iterator to the end of the symbol table.
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inline iterator end() { return vmap.end(); }
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/// @brief Get a const_iterator to the end of the symbol table.
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inline const_iterator end() const { return vmap.end(); }
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/// @}
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/// @name Mutators
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/// @{
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private:
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ValueName *makeUniqueName(Value *V, SmallString<256> &UniqueName);
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/// This method adds the provided value \p N to the symbol table. The Value
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/// must have a name which is used to place the value in the symbol table.
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/// If the inserted name conflicts, this renames the value.
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/// @brief Add a named value to the symbol table
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void reinsertValue(Value *V);
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/// createValueName - This method attempts to create a value name and insert
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/// it into the symbol table with the specified name. If it conflicts, it
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/// auto-renames the name and returns that instead.
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ValueName *createValueName(StringRef Name, Value *V);
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/// This method removes a value from the symbol table. It leaves the
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/// ValueName attached to the value, but it is no longer inserted in the
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/// symtab.
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void removeValueName(ValueName *V);
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/// @}
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/// @name Internal Data
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/// @{
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ValueMap vmap; ///< The map that holds the symbol table.
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mutable uint32_t LastUnique = 0; ///< Counter for tracking unique names
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/// @}
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};
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} // end namespace llvm
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#endif // LLVM_IR_VALUESYMBOLTABLE_H
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