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//===- llvm/ValueSymbolTable.h - Implement a Value Symtab -------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the name/Value symbol table for LLVM.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_VALUESYMBOLTABLE_H
#define LLVM_IR_VALUESYMBOLTABLE_H
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/Value.h"
#include <cstdint>
namespace llvm {
class Argument;
class BasicBlock;
class Function;
class GlobalAlias;
class GlobalIFunc;
class GlobalVariable;
class Instruction;
template <bool ExtraIteratorBits> struct ilist_iterator_bits;
template <class ParentTy> struct ilist_parent;
template <unsigned InternalLen> class SmallString;
template <typename ValueSubClass, typename ... Args> class SymbolTableListTraits;
/// 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 SymbolTableListTraits<Argument>;
friend class SymbolTableListTraits<BasicBlock>;
friend class SymbolTableListTraits<Function>;
friend class SymbolTableListTraits<GlobalAlias>;
friend class SymbolTableListTraits<GlobalIFunc>;
friend class SymbolTableListTraits<GlobalVariable>;
friend class SymbolTableListTraits<Instruction, ilist_iterator_bits<true>,
ilist_parent<BasicBlock>>;
friend class Value;
/// @name Types
/// @{
public:
/// A mapping of names to values.
using ValueMap = StringMap<Value*>;
/// An iterator over a ValueMap.
using iterator = ValueMap::iterator;
/// A const_iterator over a ValueMap.
using const_iterator = ValueMap::const_iterator;
/// @}
/// @name Constructors
/// @{
ValueSymbolTable(int MaxNameSize = -1) : vmap(0), MaxNameSize(MaxNameSize) {}
~ValueSymbolTable();
/// @}
/// @name Accessors
/// @{
/// This method finds the value with the given \p Name in the
/// the symbol table.
/// @returns the value associated with the \p Name
/// Lookup a named Value.
Value *lookup(StringRef Name) const {
if (MaxNameSize > -1 && Name.size() > (unsigned)MaxNameSize)
Name = Name.substr(0, std::max(1u, (unsigned)MaxNameSize));
return vmap.lookup(Name);
}
/// @returns true iff the symbol table is empty
/// Determine if the symbol table is empty
inline bool empty() const { return vmap.empty(); }
/// 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.
/// Print out symbol table on stderr
void dump() const;
/// @}
/// @name Iteration
/// @{
/// Get an iterator that from the beginning of the symbol table.
inline iterator begin() { return vmap.begin(); }
/// Get a const_iterator that from the beginning of the symbol table.
inline const_iterator begin() const { return vmap.begin(); }
/// Get an iterator to the end of the symbol table.
inline iterator end() { return vmap.end(); }
/// Get a const_iterator to the end of the symbol table.
inline const_iterator end() const { return vmap.end(); }
/// @}
/// @name Mutators
/// @{
private:
ValueName *makeUniqueName(Value *V, SmallString<256> &UniqueName);
/// 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.
/// 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
/// @{
ValueMap vmap; ///< The map that holds the symbol table.
int MaxNameSize; ///< The maximum size for each name. If the limit is
///< exceeded, the name is capped.
mutable uint32_t LastUnique = 0; ///< Counter for tracking unique names
/// @}
};
} // end namespace llvm
#endif // LLVM_IR_VALUESYMBOLTABLE_H
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