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//===--- APSIntType.cpp - Simple record of the type of APSInts ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/StaticAnalyzer/Core/PathSensitive/APSIntType.h"
using namespace clang;
using namespace ento;
APSIntType::RangeTestResultKind
APSIntType::testInRange(const llvm::APSInt &Value,
bool AllowSignConversions) const {
// Negative numbers cannot be losslessly converted to unsigned type.
if (IsUnsigned && !AllowSignConversions &&
Value.isSigned() && Value.isNegative())
return RTR_Below;
unsigned MinBits;
if (AllowSignConversions) {
if (Value.isSigned() && !IsUnsigned)
MinBits = Value.getMinSignedBits();
else
MinBits = Value.getActiveBits();
} else {
// Signed integers can be converted to signed integers of the same width
// or (if positive) unsigned integers with one fewer bit.
// Unsigned integers can be converted to unsigned integers of the same width
// or signed integers with one more bit.
if (Value.isSigned())
MinBits = Value.getMinSignedBits() - IsUnsigned;
else
MinBits = Value.getActiveBits() + !IsUnsigned;
}
if (MinBits <= BitWidth)
return RTR_Within;
if (Value.isSigned() && Value.isNegative())
return RTR_Below;
else
return RTR_Above;
}
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