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/**
* Copyright (C) 2022-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/exec/sbe/values/arith_common.h"
/**
These common operations - Addition, Subtraction and Multiplication - are used in both the VM and
constant folding in the optimizer. These methods are extensible for any computation with SBE values.
*/
namespace mongo::sbe::value {
/**
* The addition operation used by genericArithmeticOp.
*/
struct Addition {
/**
* Returns true if the operation failed (overflow).
*/
template <typename T>
static bool doOperation(const T& lhs, const T& rhs, T& result) {
if constexpr (std::is_same_v<T, Decimal128>) {
result = lhs.add(rhs);
// We do not check overflows with Decimal128.
return false;
} else if constexpr (std::is_same_v<T, double>) {
result = lhs + rhs;
// We do not check overflows with double.
return false;
} else {
return overflow::add(lhs, rhs, &result);
}
}
};
/**
* The subtraction operation used by genericArithmeticOp.
*/
struct Subtraction {
/**
* Returns true if the operation failed (overflow).
*/
template <typename T>
static bool doOperation(const T& lhs, const T& rhs, T& result) {
if constexpr (std::is_same_v<T, Decimal128>) {
result = lhs.subtract(rhs);
// We do not check overflows with Decimal128.
return false;
} else if constexpr (std::is_same_v<T, double>) {
result = lhs - rhs;
// We do not check overflows with double.
return false;
} else {
return overflow::sub(lhs, rhs, &result);
}
}
};
/**
* The multiplication operation used by genericArithmeticOp.
*/
struct Multiplication {
/**
* Returns true if the operation failed (overflow).
*/
template <typename T>
static bool doOperation(const T& lhs, const T& rhs, T& result) {
if constexpr (std::is_same_v<T, Decimal128>) {
result = lhs.multiply(rhs);
// We do not check overflows with Decimal128.
return false;
} else if constexpr (std::is_same_v<T, double>) {
result = lhs * rhs;
// We do not check overflows with double.
return false;
} else {
return overflow::mul(lhs, rhs, &result);
}
}
};
/**
* This is a simple arithmetic operation templated by the Op parameter. It supports operations on
* standard numeric types and also operations on the Date type.
*/
template <typename Op>
std::tuple<bool, value::TypeTags, value::Value> genericArithmeticOp(value::TypeTags lhsTag,
value::Value lhsValue,
value::TypeTags rhsTag,
value::Value rhsValue) {
if (value::isNumber(lhsTag) && value::isNumber(rhsTag)) {
switch (getWidestNumericalType(lhsTag, rhsTag)) {
case value::TypeTags::NumberInt32: {
int32_t result;
if (!Op::doOperation(numericCast<int32_t>(lhsTag, lhsValue),
numericCast<int32_t>(rhsTag, rhsValue),
result)) {
return {
false, value::TypeTags::NumberInt32, value::bitcastFrom<int32_t>(result)};
}
// The result does not fit into int32_t so fallthru to the wider type.
[[fallthrough]];
}
case value::TypeTags::NumberInt64: {
int64_t result;
if (!Op::doOperation(numericCast<int64_t>(lhsTag, lhsValue),
numericCast<int64_t>(rhsTag, rhsValue),
result)) {
return {
false, value::TypeTags::NumberInt64, value::bitcastFrom<int64_t>(result)};
}
// The result does not fit into int64_t so fallthru to the wider type.
[[fallthrough]];
}
case value::TypeTags::NumberDecimal: {
Decimal128 result;
Op::doOperation(numericCast<Decimal128>(lhsTag, lhsValue),
numericCast<Decimal128>(rhsTag, rhsValue),
result);
auto [tag, val] = value::makeCopyDecimal(result);
return {true, tag, val};
}
case value::TypeTags::NumberDouble: {
double result;
Op::doOperation(numericCast<double>(lhsTag, lhsValue),
numericCast<double>(rhsTag, rhsValue),
result);
return {false, value::TypeTags::NumberDouble, value::bitcastFrom<double>(result)};
}
default:
MONGO_UNREACHABLE;
}
} else if (lhsTag == TypeTags::Date || rhsTag == TypeTags::Date) {
if (isNumber(lhsTag)) {
int64_t result;
switch (lhsTag) {
case TypeTags::NumberDouble: {
using limits = std::numeric_limits<int64_t>;
double doubleLhs = numericCast<double>(lhsTag, lhsValue);
// The upper bound is exclusive because it rounds up when it is cast to a
// double.
if (doubleLhs >= static_cast<double>(limits::min()) &&
doubleLhs < static_cast<double>(limits::max()) &&
!Op::template doOperation<int64_t>(
llround(doubleLhs), bitcastTo<int64_t>(rhsValue), result)) {
return {false, value::TypeTags::Date, value::bitcastFrom<int64_t>(result)};
}
break;
}
case TypeTags::NumberDecimal: {
using limits = std::numeric_limits<int64_t>;
auto decimalLhs = numericCast<Decimal128>(lhsTag, lhsValue);
if (decimalLhs.isGreaterEqual(Decimal128{limits::min()}) &&
decimalLhs.isLess(Decimal128{limits::max()}) &&
!Op::doOperation(
decimalLhs.toLong(), bitcastTo<int64_t>(rhsValue), result)) {
return {false, value::TypeTags::Date, value::bitcastFrom<int64_t>(result)};
}
break;
}
default: {
if (!Op::doOperation(numericCast<int64_t>(lhsTag, lhsValue),
bitcastTo<int64_t>(rhsValue),
result)) {
return {false, value::TypeTags::Date, value::bitcastFrom<int64_t>(result)};
}
}
}
} else if (isNumber(rhsTag)) {
int64_t result;
switch (rhsTag) {
case TypeTags::NumberDouble: {
using limits = std::numeric_limits<int64_t>;
double doubleRhs = numericCast<double>(rhsTag, rhsValue);
// The upper bound is exclusive because it rounds up when it is cast to a
// double.
if (doubleRhs >= static_cast<double>(limits::min()) &&
doubleRhs < static_cast<double>(limits::max()) &&
!Op::template doOperation<int64_t>(
bitcastTo<int64_t>(lhsValue), llround(doubleRhs), result)) {
return {false, value::TypeTags::Date, value::bitcastFrom<int64_t>(result)};
}
break;
}
case TypeTags::NumberDecimal: {
auto decimalRhs = numericCast<Decimal128>(rhsTag, rhsValue);
std::uint32_t signalingFlags = Decimal128::SignalingFlag::kNoFlag;
std::int64_t longRhs = decimalRhs.toLong(&signalingFlags);
if (signalingFlags == Decimal128::SignalingFlag::kNoFlag &&
!Op::doOperation(bitcastTo<int64_t>(lhsValue), longRhs, result)) {
return {false, value::TypeTags::Date, value::bitcastFrom<int64_t>(result)};
}
break;
}
default: {
if (!Op::doOperation(bitcastTo<int64_t>(lhsValue),
numericCast<int64_t>(rhsTag, rhsValue),
result)) {
return {false, value::TypeTags::Date, value::bitcastFrom<int64_t>(result)};
}
}
}
} else {
int64_t result;
if (!Op::doOperation(
bitcastTo<int64_t>(lhsValue), bitcastTo<int64_t>(lhsValue), result)) {
return {false, value::TypeTags::NumberInt64, value::bitcastFrom<int64_t>(result)};
}
}
// We got here if the Date operation overflowed.
uasserted(ErrorCodes::Overflow, "date overflow");
}
return {false, value::TypeTags::Nothing, 0};
}
std::tuple<bool, value::TypeTags, value::Value> genericAdd(value::TypeTags lhsTag,
value::Value lhsValue,
value::TypeTags rhsTag,
value::Value rhsValue) {
return genericArithmeticOp<Addition>(lhsTag, lhsValue, rhsTag, rhsValue);
}
std::tuple<bool, value::TypeTags, value::Value> genericSub(value::TypeTags lhsTag,
value::Value lhsValue,
value::TypeTags rhsTag,
value::Value rhsValue) {
return genericArithmeticOp<Subtraction>(lhsTag, lhsValue, rhsTag, rhsValue);
}
std::tuple<bool, value::TypeTags, value::Value> genericMul(value::TypeTags lhsTag,
value::Value lhsValue,
value::TypeTags rhsTag,
value::Value rhsValue) {
return genericArithmeticOp<Multiplication>(lhsTag, lhsValue, rhsTag, rhsValue);
}
} // namespace mongo::sbe::value
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