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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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48 | 48 |
49 // Converts a string into a double value according to ECMA-262 9.3.1 | 49 // Converts a string into a double value according to ECMA-262 9.3.1 |
50 double StringToDouble(UnicodeCache* unicode_cache, | 50 double StringToDouble(UnicodeCache* unicode_cache, |
51 String* str, | 51 String* str, |
52 int flags, | 52 int flags, |
53 double empty_string_val = 0); | 53 double empty_string_val = 0); |
54 | 54 |
55 // Converts a string into an integer. | 55 // Converts a string into an integer. |
56 double StringToInt(UnicodeCache* unicode_cache, String* str, int radix); | 56 double StringToInt(UnicodeCache* unicode_cache, String* str, int radix); |
57 | 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(Smi::kMaxValue <= std::numeric_limits<size_t>::max()); | |
64 if (value >= 0) { | |
65 *result = static_cast<size_t>(value); | |
66 return true; | |
67 } | |
68 return false; | |
69 } else { | |
70 ASSERT(number->IsHeapNumber()); | |
71 double value = HeapNumber::cast(number)->value(); | |
72 if (value >= 0 && | |
73 value <= std::numeric_limits<size_t>::max()) { | |
74 *result = static_cast<size_t>(value); | |
75 return true; | |
76 } else { | |
77 return false; | |
78 } | |
79 } | |
80 } | |
81 | |
82 // Converts a number into size_t. | 58 // Converts a number into size_t. |
83 inline size_t NumberToSize(Isolate* isolate, | 59 inline size_t NumberToSize(Isolate* isolate, |
84 Object* number) { | 60 Object* number) { |
85 size_t result; | 61 SealHandleScope shs(isolate); |
86 bool is_valid = TryNumberToSize(isolate, number, &result); | 62 if (number->IsSmi()) { |
87 CHECK(is_valid); | 63 int value = Smi::cast(number)->value(); |
88 return result; | 64 CHECK_GE(value, 0); |
| 65 ASSERT( |
| 66 static_cast<unsigned>(Smi::kMaxValue) |
| 67 <= std::numeric_limits<size_t>::max()); |
| 68 return static_cast<size_t>(value); |
| 69 } else { |
| 70 ASSERT(number->IsHeapNumber()); |
| 71 double value = HeapNumber::cast(number)->value(); |
| 72 CHECK(value >= 0 && |
| 73 value <= std::numeric_limits<size_t>::max()); |
| 74 return static_cast<size_t>(value); |
| 75 } |
89 } | 76 } |
90 | 77 |
91 } } // namespace v8::internal | 78 } } // namespace v8::internal |
92 | 79 |
93 #endif // V8_V8CONVERSIONS_H_ | 80 #endif // V8_V8CONVERSIONS_H_ |
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