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ce770dda2c
This looks ridiculous but SmallVector's realloc tricks really help with large vectors of PODs, such as our virtreg IndexedMap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230866 91177308-0d34-0410-b5e6-96231b3b80d8
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
//===- llvm/ADT/IndexedMap.h - An index map implementation ------*- 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 an indexed map. The index map template takes two
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// types. The first is the mapped type and the second is a functor
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// that maps its argument to a size_t. On instantiation a "null" value
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// can be provided to be used as a "does not exist" indicator in the
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// map. A member function grow() is provided that given the value of
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// the maximally indexed key (the argument of the functor) makes sure
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// the map has enough space for it.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_INDEXEDMAP_H
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#define LLVM_ADT_INDEXEDMAP_H
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.h"
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#include <cassert>
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#include <functional>
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namespace llvm {
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template <typename T, typename ToIndexT = llvm::identity<unsigned> >
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class IndexedMap {
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typedef typename ToIndexT::argument_type IndexT;
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typedef SmallVector<T, 0> StorageT;
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StorageT storage_;
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T nullVal_;
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ToIndexT toIndex_;
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public:
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IndexedMap() : nullVal_(T()) { }
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explicit IndexedMap(const T& val) : nullVal_(val) { }
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typename StorageT::reference operator[](IndexT n) {
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assert(toIndex_(n) < storage_.size() && "index out of bounds!");
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return storage_[toIndex_(n)];
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}
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typename StorageT::const_reference operator[](IndexT n) const {
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assert(toIndex_(n) < storage_.size() && "index out of bounds!");
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return storage_[toIndex_(n)];
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}
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void reserve(typename StorageT::size_type s) {
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storage_.reserve(s);
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}
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void resize(typename StorageT::size_type s) {
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storage_.resize(s, nullVal_);
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}
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void clear() {
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storage_.clear();
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}
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void grow(IndexT n) {
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unsigned NewSize = toIndex_(n) + 1;
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if (NewSize > storage_.size())
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resize(NewSize);
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}
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bool inBounds(IndexT n) const {
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return toIndex_(n) < storage_.size();
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}
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typename StorageT::size_type size() const {
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return storage_.size();
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}
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};
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} // End llvm namespace
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#endif
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