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1 //===-- llvm/ADT/APSInt.cpp - Arbitrary Precision Signed Int ---*- C++ -*--===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements the APSInt class, which is a simple class that
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10 // represents an arbitrary sized integer that knows its signedness.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/ADT/APSInt.h"
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15 #include "llvm/ADT/FoldingSet.h"
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16 #include "llvm/ADT/StringRef.h"
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173
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17 #include <cassert>
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150
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18
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19 using namespace llvm;
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20
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21 APSInt::APSInt(StringRef Str) {
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22 assert(!Str.empty() && "Invalid string length");
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23
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24 // (Over-)estimate the required number of bits.
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25 unsigned NumBits = ((Str.size() * 64) / 19) + 2;
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26 APInt Tmp(NumBits, Str, /*radix=*/10);
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27 if (Str[0] == '-') {
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28 unsigned MinBits = Tmp.getMinSignedBits();
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29 if (MinBits > 0 && MinBits < NumBits)
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30 Tmp = Tmp.trunc(MinBits);
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31 *this = APSInt(Tmp, /*isUnsigned=*/false);
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32 return;
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33 }
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34 unsigned ActiveBits = Tmp.getActiveBits();
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35 if (ActiveBits > 0 && ActiveBits < NumBits)
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36 Tmp = Tmp.trunc(ActiveBits);
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37 *this = APSInt(Tmp, /*isUnsigned=*/true);
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38 }
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39
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40 void APSInt::Profile(FoldingSetNodeID& ID) const {
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41 ID.AddInteger((unsigned) (IsUnsigned ? 1 : 0));
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42 APInt::Profile(ID);
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43 }
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