2093d2eea1
As mentioned a few times in the past, the previous handling using a `optional<pair<bool, std::shared_ptr<>>>` was confusing and nobody ever remembered what the optional being unset meant or what the bool stood for. Add an `InitMapPtr` struct that wraps a `uintptr_t` that either holds a pointer to a valid `InitMap` instance _or_ one of two special values. The struct has meaningful accessors for the various special cases that were confusing before.
32 lines
968 B
C++
32 lines
968 B
C++
//===----------------------- InitMap.cpp ------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "InitMap.h"
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using namespace clang;
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using namespace clang::interp;
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InitMap::InitMap(unsigned N)
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: UninitFields(N), Data(std::make_unique<T[]>(numFields(N))) {}
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bool InitMap::initializeElement(unsigned I) {
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unsigned Bucket = I / PER_FIELD;
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T Mask = T(1) << (I % PER_FIELD);
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if (!(data()[Bucket] & Mask)) {
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data()[Bucket] |= Mask;
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UninitFields -= 1;
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}
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return UninitFields == 0;
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}
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bool InitMap::isElementInitialized(unsigned I) const {
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if (UninitFields == 0)
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return true;
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unsigned Bucket = I / PER_FIELD;
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return data()[Bucket] & (T(1) << (I % PER_FIELD));
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}
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