1 // Copyright 2011 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #ifndef V8_V8CONVERSIONS_H_ 29 #define V8_V8CONVERSIONS_H_ 30 31 #include "conversions.h" 32 33 namespace v8 { 34 namespace internal { 35 36 // Convert from Number object to C integer. 37 inline int32_t NumberToInt32(Object* number) { 38 if (number->IsSmi()) return Smi::cast(number)->value(); 39 return DoubleToInt32(number->Number()); 40 } 41 42 43 inline uint32_t NumberToUint32(Object* number) { 44 if (number->IsSmi()) return Smi::cast(number)->value(); 45 return DoubleToUint32(number->Number()); 46 } 47 48 49 // Converts a string into a double value according to ECMA-262 9.3.1 50 double StringToDouble(UnicodeCache* unicode_cache, 51 String* str, 52 int flags, 53 double empty_string_val = 0); 54 55 // Converts a string into an integer. 56 double StringToInt(UnicodeCache* unicode_cache, String* str, int radix); 57 58 inline bool TryNumberToSize(Isolate* isolate, 59 Object* number, size_t* result) { 60 SealHandleScope shs(isolate); 61 if (number->IsSmi()) { 62 int value = Smi::cast(number)->value(); 63 ASSERT( 64 static_cast<unsigned>(Smi::kMaxValue) 65 <= std::numeric_limits<size_t>::max()); 66 if (value >= 0) { 67 *result = static_cast<size_t>(value); 68 return true; 69 } 70 return false; 71 } else { 72 ASSERT(number->IsHeapNumber()); 73 double value = HeapNumber::cast(number)->value(); 74 if (value >= 0 && 75 value <= std::numeric_limits<size_t>::max()) { 76 *result = static_cast<size_t>(value); 77 return true; 78 } else { 79 return false; 80 } 81 } 82 } 83 84 // Converts a number into size_t. 85 inline size_t NumberToSize(Isolate* isolate, 86 Object* number) { 87 size_t result = 0; 88 bool is_valid = TryNumberToSize(isolate, number, &result); 89 CHECK(is_valid); 90 return result; 91 } 92 93 } } // namespace v8::internal 94 95 #endif // V8_V8CONVERSIONS_H_ 96
