lib/AST/ByteCode/InitMap.cpp

//===----------------------- InitMap.cpp ------------------------*- 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
//
//===----------------------------------------------------------------------===//
#include "InitMap.h"

using namespace clang;
using namespace clang::interp;

InitMap::InitMap(unsigned N)
    : UninitFields(N), Data(std::make_unique<T[]>(numFields(N))) {}

bool InitMap::initializeElement(unsigned I) {
  unsigned Bucket = I / PER_FIELD;
  T Mask = T(1) << (I % PER_FIELD);
  if (!(data()[Bucket] & Mask)) {
    data()[Bucket] |= Mask;
    UninitFields -= 1;
  }
  return UninitFields == 0;
}

bool InitMap::isElementInitialized(unsigned I) const {
  if (UninitFields == 0)
    return true;
  unsigned Bucket = I / PER_FIELD;
  return data()[Bucket] & (T(1) << (I % PER_FIELD));
}