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// Licensed to the Apache Software Foundation (ASF) under one // or more contributor license agreements. See the NOTICE file // distributed with this work for additional information // regarding copyright ownership. The ASF licenses this file // to you under the Apache License, Version 2.0 (the // "License"); you may not use this file except in compliance // with the License. You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, // software distributed under the License is distributed on an // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY // KIND, either express or implied. See the License for the // specific language governing permissions and limitations // under the License. #pragma once #include #include #include #include #include #include "arrow/status.h" #include "arrow/util/macros.h" #include "arrow/util/visibility.h" #include "arrow/vendored/safeint/safe_math.h" namespace arrow { namespace internal { // Define functions AddWithOverflow, SubtractWithOverflow, MultiplyWithOverflow // with the signature `bool(T u, T v, T* out)` where T is an integer type. // On overflow, these functions return true. Otherwise, false is returned // and `out` is updated with the result of the operation. #define SAFE_INT_OP_WITH_OVERFLOW(_func_name, _op_name, _c_type, _type) \ [[nodiscard]] static inline bool _func_name(_c_type u, _c_type v, _c_type* out) { \ return !check_##_op_name##_##_type##_##_type(u, v, out); \ } #define SAFE_INT_OPS_WITH_OVERFLOW(_func_name, _op_name) \ SAFE_INT_OP_WITH_OVERFLOW(_func_name, _op_name, int32_t, int32) \ SAFE_INT_OP_WITH_OVERFLOW(_func_name, _op_name, int64_t, int64) \ SAFE_INT_OP_WITH_OVERFLOW(_func_name, _op_name, uint32_t, uint32) \ SAFE_INT_OP_WITH_OVERFLOW(_func_name, _op_name, uint64_t, uint64) SAFE_INT_OPS_WITH_OVERFLOW(SafeIntAddWithOverflow, add) SAFE_INT_OPS_WITH_OVERFLOW(SafeIntSubtractWithOverflow, sub) SAFE_INT_OPS_WITH_OVERFLOW(SafeIntMultiplyWithOverflow, mul) #undef SAFE_INT_OP_WITH_OVERFLOW #undef SAFE_INT_OPS_WITH_OVERFLOW template using transformed_int_t = std::conditional_t, SignedRet, UnsignedRet>; template using upscaled_int32_t = transformed_int_t; // Use GCC/CLang builtins for checked arithmetic, promising better performance // than SafeInt's hand-written implementations. #if defined __has_builtin # if __has_builtin(__builtin_object_size) # define USE_CHECKED_ARITHMETIC_BUILTINS 1 # else # define USE_CHECKED_ARITHMETIC_BUILTINS 0 # endif #endif template [[nodiscard]] bool AddWithOverflowGeneric(Int u, Int v, Int* out) { #if USE_CHECKED_ARITHMETIC_BUILTINS return __builtin_add_overflow(u, v, out); #else if constexpr (sizeof(Int) < 4) { using UpscaledInt = upscaled_int32_t; auto r = static_cast(u) + static_cast(v); *out = static_cast(r); return r != *out; } else { return SafeIntAddWithOverflow(u, v, out); } #endif } template [[nodiscard]] bool SubtractWithOverflowGeneric(Int u, Int v, Int* out) { #if USE_CHECKED_ARITHMETIC_BUILTINS return __builtin_sub_overflow(u, v, out); #else if constexpr (sizeof(Int) < 4) { using UpscaledInt = upscaled_int32_t; auto r = static_cast(u) - static_cast(v); *out = static_cast(r); return r != *out; } else { return SafeIntSubtractWithOverflow(u, v, out); } #endif } template [[nodiscard]] bool MultiplyWithOverflowGeneric(Int u, Int v, Int* out) { #if USE_CHECKED_ARITHMETIC_BUILTINS return __builtin_mul_overflow(u, v, out); #else if constexpr (sizeof(Int) < 4) { using UpscaledInt = upscaled_int32_t; auto r = static_cast(u) * static_cast(v); *out = static_cast(r); return r != *out; } else { return SafeIntMultiplyWithOverflow(u, v, out); } #endif } template [[nodiscard]] bool DivideWithOverflowGeneric(Int u, Int v, Int* out) { if (v == 0) { *out = Int{}; return true; } if constexpr (std::is_signed_v) { constexpr auto kMin = std::numeric_limits::min(); if (u == kMin && v == -1) { *out = kMin; return true; } } *out = u / v; return false; } // Define non-generic versions of the above so as to benefit from automatic // integer conversion, to allow for mixed-type calls such as // AddWithOverflow(int32_t, int64_t, int64_t*). #define NON_GENERIC_OP_WITH_OVERFLOW(_func_name, _c_type) \ [[nodiscard]] inline bool _func_name(_c_type u, _c_type v, _c_type* out) { \ return ARROW_PREDICT_FALSE(_func_name##Generic(u, v, out)); \ } #define NON_GENERIC_OPS_WITH_OVERFLOW(_func_name) \ NON_GENERIC_OP_WITH_OVERFLOW(_func_name, int8_t) \ NON_GENERIC_OP_WITH_OVERFLOW(_func_name, uint8_t) \ NON_GENERIC_OP_WITH_OVERFLOW(_func_name, int16_t) \ NON_GENERIC_OP_WITH_OVERFLOW(_func_name, uint16_t) \ NON_GENERIC_OP_WITH_OVERFLOW(_func_name, int32_t) \ NON_GENERIC_OP_WITH_OVERFLOW(_func_name, uint32_t) \ NON_GENERIC_OP_WITH_OVERFLOW(_func_name, int64_t) \ NON_GENERIC_OP_WITH_OVERFLOW(_func_name, uint64_t) NON_GENERIC_OPS_WITH_OVERFLOW(AddWithOverflow) NON_GENERIC_OPS_WITH_OVERFLOW(SubtractWithOverflow) NON_GENERIC_OPS_WITH_OVERFLOW(MultiplyWithOverflow) NON_GENERIC_OPS_WITH_OVERFLOW(DivideWithOverflow) #undef NON_GENERIC_OPS_WITH_OVERFLOW #undef NON_GENERIC_OP_WITH_OVERFLOW // Convenience functions over an arbitrary number of arguments template std::optional AddWithOverflow(std::initializer_list vs) { if (vs.size() == 0) { return {}; } auto it = vs.begin(); Int v = *it++; while (it != vs.end()) { if (ARROW_PREDICT_FALSE(AddWithOverflowGeneric(v, *it++, &v))) { return {}; } } return v; } template std::optional MultiplyWithOverflow(std::initializer_list vs) { if (vs.size() == 0) { return {}; } auto it = vs.begin(); Int v = *it++; while (it != vs.end()) { if (ARROW_PREDICT_FALSE(MultiplyWithOverflowGeneric(v, *it++, &v))) { return {}; } } return v; } // Define function NegateWithOverflow with the signature `bool(T u, T* out)` // where T is a signed integer type. On overflow, these functions return true. // Otherwise, false is returned and `out` is updated with the result of the // operation. template [[nodiscard]] bool NegateWithOverflow(Int v, Int* out) { return SubtractWithOverflow(Int{}, v, out); } /// Signed addition with well-defined behaviour on overflow (as unsigned) template SignedInt SafeSignedAdd(SignedInt u, SignedInt v) { using UnsignedInt = typename std::make_unsigned::type; return static_cast(static_cast(u) + static_cast(v)); } /// Signed subtraction with well-defined behaviour on overflow (as unsigned) template SignedInt SafeSignedSubtract(SignedInt u, SignedInt v) { using UnsignedInt = typename std::make_unsigned::type; return static_cast(static_cast(u) - static_cast(v)); } /// Signed negation with well-defined behaviour on overflow (as unsigned) template SignedInt SafeSignedNegate(SignedInt u) { using UnsignedInt = typename std::make_unsigned::type; return static_cast(~static_cast(u) + 1); } /// Signed left shift with well-defined behaviour on negative numbers or overflow template SignedInt SafeLeftShift(SignedInt u, Shift shift) { using UnsignedInt = typename std::make_unsigned::type; return static_cast(static_cast(u) << shift); } } // namespace internal } // namespace arrow