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0030720: Coding - fix HashCode() function problems that are not resolved with 30550

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Undefined behavior caused by left shift operations in TopLoc_Location::HashCode() function is fixed.
HashCode() function overload for Standard_Size type is made available only if Standard_Size and "unsigned int" are different types (it is usually true for 64-bit platforms). The overload for "unsigned int" is made simple non-templated function (so it behaves the same on 32-bit and 64-bit platforms).
HashCode() function overload for Standard_Utf32Char type is made available only if Standard_Utf32Char and "unsigned int" are different types (it is needed for some old compilers).
This commit is contained in:
tiv 2019-09-24 16:42:21 +03:00 committed by bugmaster
parent 0a5ec5f380
commit 467e864adf
3 changed files with 26 additions and 18 deletions
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26
src/Standard/Standard_Integer.hxx
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@ -130,18 +130,12 @@ inline Standard_Boolean IsEqual (const Standard_Integer theOne,
}
//! Computes a hash value for the given unsigned integer, in range [1, theUpperBound]
//! @tparam TheUnsignedInteger the type of the given value (it is "unsigned int",
//! and must not be the same as Standard_Size, because the overload of the HashCode function
//! for Standard_Size type is already presented in Standard_Size.hxx)
//! @param theValue the unsigned integer which hash code is to be computed
//! @param theUpperBound the upper bound of the range a computing hash code must be within
//! @return a hash value computed for the given unsigned integer, in range [1, theUpperBound]
template <typename TheUnsignedInteger>
typename opencascade::std::enable_if<!opencascade::std::is_same<Standard_Size, unsigned int>::value
&& opencascade::std::is_same<TheUnsignedInteger, unsigned int>::value,
Standard_Integer>::type
HashCode (const TheUnsignedInteger theValue, const Standard_Integer theUpperBound)
inline Standard_Integer HashCode (const unsigned int theValue, const Standard_Integer theUpperBound)
{
return HashCode (static_cast<Standard_Integer> (theValue), theUpperBound);
return ::HashCode (static_cast<Standard_Integer> (theValue), theUpperBound);
}
//! Computes a hash code for the given value of the "long long int" type, in range [1, theUpperBound]
@ -155,12 +149,18 @@ inline Standard_Integer HashCode (const long long int theValue, const Standard_I
#if (defined(_LP64) || defined(__LP64__) || defined(_WIN64)) || defined(__APPLE__)
//! Computes a hash code for the given value of the Standard_Utf32Char type, in range [1, theUpperBound]
//! Computes a hash code for the given value of the Standard_Utf32Char type, in the range [1, theUpperBound]
//! @tparam TheUtf32Char the type of the given value (it is Standard_Utf32Char,
//! and must not be the same as "unsigned int", because the overload of the HashCode function
//! for "unsigned int" type is already presented in Standard_Integer.hxx)
//! @param theValue the value of the Standard_Utf32Char type which hash code is to be computed
//! @param theUpperBound the upper bound of the range a computing hash code must be within
//! @return a computed hash code, in range [1, theUpperBound]
inline Standard_Integer HashCode (const Standard_Utf32Char theValue,
const Standard_Integer theUpperBound)
//! @return a computed hash code, in the range [1, theUpperBound]
template <typename TheUtf32Char>
typename opencascade::std::enable_if<!opencascade::std::is_same<Standard_Utf32Char, unsigned int>::value
&& opencascade::std::is_same<TheUtf32Char, Standard_Utf32Char>::value,
Standard_Integer>::type
HashCode (const TheUtf32Char theValue, const Standard_Integer theUpperBound)
{
return IntegerHashCode (theValue, IntegerLast(), theUpperBound);
}

9
src/Standard/Standard_Size.hxx
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@ -21,10 +21,17 @@
// msv 26.05.2009: add HashCode and IsEqual functions
//! Computes a hash code for the given value of the Standard_Size type, in the range [1, theUpperBound]
//! @tparam TheSize the type of the given value (it is Standard_Size,
//! and must not be the same as "unsigned int", because the overload of the HashCode function
//! for "unsigned int" type is already presented in Standard_Integer.hxx)
//! @param theValue the value of the Standard_Size type which hash code is to be computed
//! @param theUpperBound the upper bound of the range a computing hash code must be within
//! @return a computed hash code, in the range [1, theUpperBound]
inline Standard_Integer HashCode (const Standard_Size theValue, const Standard_Integer theUpperBound)
template <typename TheSize>
typename opencascade::std::enable_if<!opencascade::std::is_same<Standard_Size, unsigned int>::value
&& opencascade::std::is_same<TheSize, Standard_Size>::value,
Standard_Integer>::type
HashCode (const TheSize theValue, const Standard_Integer theUpperBound)
{
Standard_Size aKey = ~theValue + (theValue << 18);
aKey ^= (aKey >> 31);

5
src/TopLoc/TopLoc_Location.cxx
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@ -193,8 +193,9 @@ Standard_Integer TopLoc_Location::HashCode (const Standard_Integer theUpperBound
{
depth += 3;
unsigned int i = ::HashCode (items.Value().myDatum, theUpperBound);
unsigned int j = ((i + items.Value().myPower) << depth);
j = j >> (32 - depth) | j << depth;
const Standard_Integer aClampedDepth = depth % 32;
unsigned int j = ((i + items.Value().myPower) << aClampedDepth);
j = j >> (32 - aClampedDepth) | j << aClampedDepth;
h ^= j;
items.Next ();
}