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
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
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28 #ifndef V8_V8CONVERSIONS_H_
29 #define V8_V8CONVERSIONS_H_
31 #include "conversions.h"
37 static inline bool IsMinusZero(double value) {
38 static const DoubleRepresentation minus_zero(-0.0);
39 return DoubleRepresentation(value) == minus_zero;
43 // Integer32 is an integer that can be represented as a signed 32-bit
44 // integer. It has to be in the range [-2^31, 2^31 - 1].
45 // We also have to check for negative 0 as it is not an Integer32.
46 static inline bool IsInt32Double(double value) {
47 return !IsMinusZero(value) &&
50 value == FastI2D(FastD2I(value));
54 // Convert from Number object to C integer.
55 inline int32_t NumberToInt32(Object* number) {
56 if (number->IsSmi()) return Smi::cast(number)->value();
57 return DoubleToInt32(number->Number());
61 inline uint32_t NumberToUint32(Object* number) {
62 if (number->IsSmi()) return Smi::cast(number)->value();
63 return DoubleToUint32(number->Number());
67 // Converts a string into a double value according to ECMA-262 9.3.1
68 double StringToDouble(UnicodeCache* unicode_cache,
71 double empty_string_val = 0);
73 // Converts a string into an integer.
74 double StringToInt(UnicodeCache* unicode_cache, String* str, int radix);
76 inline bool TryNumberToSize(Isolate* isolate,
77 Object* number, size_t* result) {
78 SealHandleScope shs(isolate);
79 if (number->IsSmi()) {
80 int value = Smi::cast(number)->value();
82 static_cast<unsigned>(Smi::kMaxValue)
83 <= std::numeric_limits<size_t>::max());
85 *result = static_cast<size_t>(value);
90 ASSERT(number->IsHeapNumber());
91 double value = HeapNumber::cast(number)->value();
93 value <= std::numeric_limits<size_t>::max()) {
94 *result = static_cast<size_t>(value);
102 // Converts a number into size_t.
103 inline size_t NumberToSize(Isolate* isolate,
106 bool is_valid = TryNumberToSize(isolate, number, &result);
111 } } // namespace v8::internal
113 #endif // V8_V8CONVERSIONS_H_