1//===--- APSIntType.cpp - Simple record of the type of APSInts ------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "clang/StaticAnalyzer/Core/PathSensitive/APSIntType.h"
10
11using namespace clang;
12using namespace ento;
13
14APSIntType::RangeTestResultKind
15APSIntType::testInRange(const llvm::APSInt &Value,
16 bool AllowSignConversions) const {
17
18 // Negative numbers cannot be losslessly converted to unsigned type.
19 if (IsUnsigned && !AllowSignConversions &&
20 Value.isSigned() && Value.isNegative())
21 return RTR_Below;
22
23 unsigned MinBits;
24 if (AllowSignConversions) {
25 if (Value.isSigned() && !IsUnsigned)
26 MinBits = Value.getMinSignedBits();
27 else
28 MinBits = Value.getActiveBits();
29
30 } else {
31 // Signed integers can be converted to signed integers of the same width
32 // or (if positive) unsigned integers with one fewer bit.
33 // Unsigned integers can be converted to unsigned integers of the same width
34 // or signed integers with one more bit.
35 if (Value.isSigned())
36 MinBits = Value.getMinSignedBits() - IsUnsigned;
37 else
38 MinBits = Value.getActiveBits() + !IsUnsigned;
39 }
40
41 if (MinBits <= BitWidth)
42 return RTR_Within;
43
44 if (Value.isSigned() && Value.isNegative())
45 return RTR_Below;
46 else
47 return RTR_Above;
48}
49

source code of clang/lib/StaticAnalyzer/Core/APSIntType.cpp