1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef ECMASCRIPT_BASE_NUMBER_HELPER_H 17 #define ECMASCRIPT_BASE_NUMBER_HELPER_H 18 19 #include <cstdint> 20 21 #include "ecmascript/ecma_string.h" 22 #include "ecmascript/js_tagged_value.h" 23 24 namespace panda::ecmascript::base { 25 constexpr double MIN_RADIX = 2; 26 constexpr double MAX_RADIX = 36; 27 constexpr double MIN_FRACTION = 0; 28 constexpr double MAX_FRACTION = 100; 29 30 // Coversion flags 31 static constexpr uint32_t NO_FLAGS = 0U; 32 static constexpr uint32_t ALLOW_BINARY = 1U << 0U; 33 static constexpr uint32_t ALLOW_OCTAL = 1U << 1U; 34 static constexpr uint32_t ALLOW_HEX = 1U << 2U; 35 static constexpr uint32_t IGNORE_TRAILING = 1U << 3U; 36 37 static constexpr uint32_t MAX_PRECISION = 16; 38 static constexpr uint8_t BINARY = 2; 39 static constexpr uint8_t OCTAL = 8; 40 static constexpr uint8_t DECIMAL = 10; 41 static constexpr uint8_t HEXADECIMAL = 16; 42 static constexpr double HALF = 0.5; 43 static constexpr double EPSILON = std::numeric_limits<double>::epsilon(); 44 static constexpr int64_t MAX_SAFE_INTEGER = 9007199254740991; 45 static constexpr double MAX_VALUE = std::numeric_limits<double>::max(); 46 static constexpr double MIN_VALUE = std::numeric_limits<double>::min(); 47 static constexpr double POSITIVE_INFINITY = std::numeric_limits<double>::infinity(); 48 static constexpr double NAN_VALUE = std::numeric_limits<double>::quiet_NaN(); 49 50 // Helper defines for double 51 static constexpr int DOUBLE_MAX_PRECISION = 17; 52 static constexpr int DOUBLE_EXPONENT_BIAS = 0x3FF; 53 static constexpr size_t DOUBLE_SIGNIFICAND_SIZE = 52; 54 static constexpr uint64_t DOUBLE_SIGN_MASK = 0x8000000000000000ULL; 55 static constexpr uint64_t DOUBLE_EXPONENT_MASK = 0x7FFULL << DOUBLE_SIGNIFICAND_SIZE; 56 static constexpr uint64_t DOUBLE_SIGNIFICAND_MASK = 0x000FFFFFFFFFFFFFULL; 57 static constexpr uint64_t DOUBLE_HIDDEN_BIT = 1ULL << DOUBLE_SIGNIFICAND_SIZE; 58 static constexpr int32_t MINUS_ZERO_LOBITS = static_cast<int32_t>(0); 59 static constexpr int32_t MINUS_ZERO_HIBITS = static_cast<int32_t>(1) << 31; 60 static constexpr int64_t MINUS_ZERO_BITS = (static_cast<uint64_t>(MINUS_ZERO_HIBITS) << 32) | MINUS_ZERO_LOBITS; 61 62 static constexpr size_t INT64_BITS = 64; 63 static constexpr size_t INT32_BITS = 32; 64 static constexpr size_t INT16_BITS = 16; 65 static constexpr size_t INT8_BITS = 8; 66 static constexpr size_t JS_DTOA_BUF_SIZE = 128; 67 68 // help defines for random 69 static constexpr int LEFT52 = 52 ; 70 static constexpr int RIGHT12 = 12; 71 static constexpr uint32_t USE_LEFT = 0x3ff; 72 static constexpr int SECONDS_TO_SUBTLE = 1000000; 73 static constexpr int RIGHT27 = 27; 74 static constexpr int LEFT25 = 25; 75 static constexpr uint64_t GET_MULTIPLY = 0x2545F4914F6CDD1D; 76 77 class NumberHelper { 78 public: GetNaN()79 static inline JSTaggedType GetNaN() 80 { 81 return JSTaggedValue(NAN_VALUE).GetRawData(); 82 } 83 GetPositiveInfinity()84 static inline JSTaggedType GetPositiveInfinity() 85 { 86 return JSTaggedValue(POSITIVE_INFINITY).GetRawData(); 87 } 88 IsFinite(JSTaggedValue number)89 static bool IsFinite(JSTaggedValue number) 90 { 91 return number.IsInt() || (number.IsDouble() && std::isfinite(number.GetDouble())); 92 } IsNaN(JSTaggedValue number)93 static bool IsNaN(JSTaggedValue number) 94 { 95 return number.IsDouble() && std::isnan(number.GetDouble()); 96 } 97 static JSTaggedValue DoubleToString(JSThread *thread, double number, int radix); 98 static bool IsEmptyString(const uint8_t *start, const uint8_t *end); 99 static JSHandle<EcmaString> NumberToString(const JSThread *thread, JSTaggedValue number); 100 static double TruncateDouble(double d); 101 static int64_t DoubleToInt64(double d); 102 static double StringToDouble(const uint8_t *start, const uint8_t *end, uint8_t radix, uint32_t flags = NO_FLAGS); 103 static int32_t DoubleToInt(double d, size_t bits); 104 static int32_t DoubleInRangeInt32(double d); 105 static JSTaggedValue DoubleToExponential(JSThread *thread, double number, int digit); 106 static JSTaggedValue DoubleToFixed(JSThread *thread, double number, int digit); 107 static JSTaggedValue DoubleToPrecision(JSThread *thread, double number, int digit); 108 static JSTaggedValue StringToDoubleWithRadix(const uint8_t *start, const uint8_t *end, int radix); 109 static CString IntToString(int number); 110 static CString IntegerToString(int64_t number, int radix); 111 static JSTaggedValue StringToBigInt(JSThread *thread, JSHandle<JSTaggedValue> strVal); 112 113 private: 114 static char Carry(char current, int radix); 115 static double Strtod(const char *str, int exponent, uint8_t radix); 116 static CString DecimalsToString(int64_t *numberInteger, double fraction, int radix, double delta); 117 static bool GotoNonspace(uint8_t **ptr, const uint8_t *end); 118 static void GetBase(double d, int digits, int *decpt, char *buf, char *bufTmp, int size); 119 static int GetMinmumDigits(double d, int *decpt, char *buf); 120 }; 121 class RandomGenerator { 122 public: 123 static uint64_t& GetRandomState(); 124 static uint64_t XorShift64(uint64_t *pVal); 125 static void InitRandom(); 126 private: 127 static thread_local uint64_t randomState; 128 }; 129 } // namespace panda::ecmascript::base 130 #endif // ECMASCRIPT_BASE_NUMBER_HELPER_H 131