1 // Copyright 2016 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/builtins/builtins-utils.h"
6 #include "src/builtins/builtins.h"
7 #include "src/code-factory.h"
8 #include "src/conversions.h"
9 #include "src/counters.h"
10 #include "src/objects-inl.h"
11
12 namespace v8 {
13 namespace internal {
14
15 // -----------------------------------------------------------------------------
16 // ES6 section 20.1 Number Objects
17
18 // ES6 section 20.1.3.2 Number.prototype.toExponential ( fractionDigits )
BUILTIN(NumberPrototypeToExponential)19 BUILTIN(NumberPrototypeToExponential) {
20 HandleScope scope(isolate);
21 Handle<Object> value = args.at(0);
22 Handle<Object> fraction_digits = args.atOrUndefined(isolate, 1);
23
24 // Unwrap the receiver {value}.
25 if (value->IsJSValue()) {
26 value = handle(Handle<JSValue>::cast(value)->value(), isolate);
27 }
28 if (!value->IsNumber()) {
29 THROW_NEW_ERROR_RETURN_FAILURE(
30 isolate, NewTypeError(MessageTemplate::kNotGeneric,
31 isolate->factory()->NewStringFromAsciiChecked(
32 "Number.prototype.toExponential"),
33 isolate->factory()->Number_string()));
34 }
35 double const value_number = value->Number();
36
37 // Convert the {fraction_digits} to an integer first.
38 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
39 isolate, fraction_digits, Object::ToInteger(isolate, fraction_digits));
40 double const fraction_digits_number = fraction_digits->Number();
41
42 if (std::isnan(value_number)) return isolate->heap()->NaN_string();
43 if (std::isinf(value_number)) {
44 return (value_number < 0.0) ? isolate->heap()->minus_Infinity_string()
45 : isolate->heap()->Infinity_string();
46 }
47 if (fraction_digits_number < 0.0 ||
48 fraction_digits_number > kMaxFractionDigits) {
49 THROW_NEW_ERROR_RETURN_FAILURE(
50 isolate, NewRangeError(MessageTemplate::kNumberFormatRange,
51 isolate->factory()->NewStringFromAsciiChecked(
52 "toExponential()")));
53 }
54 int const f = args.atOrUndefined(isolate, 1)->IsUndefined(isolate)
55 ? -1
56 : static_cast<int>(fraction_digits_number);
57 char* const str = DoubleToExponentialCString(value_number, f);
58 Handle<String> result = isolate->factory()->NewStringFromAsciiChecked(str);
59 DeleteArray(str);
60 return *result;
61 }
62
63 // ES6 section 20.1.3.3 Number.prototype.toFixed ( fractionDigits )
BUILTIN(NumberPrototypeToFixed)64 BUILTIN(NumberPrototypeToFixed) {
65 HandleScope scope(isolate);
66 Handle<Object> value = args.at(0);
67 Handle<Object> fraction_digits = args.atOrUndefined(isolate, 1);
68
69 // Unwrap the receiver {value}.
70 if (value->IsJSValue()) {
71 value = handle(Handle<JSValue>::cast(value)->value(), isolate);
72 }
73 if (!value->IsNumber()) {
74 THROW_NEW_ERROR_RETURN_FAILURE(
75 isolate, NewTypeError(MessageTemplate::kNotGeneric,
76 isolate->factory()->NewStringFromAsciiChecked(
77 "Number.prototype.toFixed"),
78 isolate->factory()->Number_string()));
79 }
80 double const value_number = value->Number();
81
82 // Convert the {fraction_digits} to an integer first.
83 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
84 isolate, fraction_digits, Object::ToInteger(isolate, fraction_digits));
85 double const fraction_digits_number = fraction_digits->Number();
86
87 // Check if the {fraction_digits} are in the supported range.
88 if (fraction_digits_number < 0.0 ||
89 fraction_digits_number > kMaxFractionDigits) {
90 THROW_NEW_ERROR_RETURN_FAILURE(
91 isolate, NewRangeError(MessageTemplate::kNumberFormatRange,
92 isolate->factory()->NewStringFromAsciiChecked(
93 "toFixed() digits")));
94 }
95
96 if (std::isnan(value_number)) return isolate->heap()->NaN_string();
97 if (std::isinf(value_number)) {
98 return (value_number < 0.0) ? isolate->heap()->minus_Infinity_string()
99 : isolate->heap()->Infinity_string();
100 }
101 char* const str = DoubleToFixedCString(
102 value_number, static_cast<int>(fraction_digits_number));
103 Handle<String> result = isolate->factory()->NewStringFromAsciiChecked(str);
104 DeleteArray(str);
105 return *result;
106 }
107
108 // ES6 section 20.1.3.4 Number.prototype.toLocaleString ( [ r1 [ , r2 ] ] )
BUILTIN(NumberPrototypeToLocaleString)109 BUILTIN(NumberPrototypeToLocaleString) {
110 HandleScope scope(isolate);
111 Handle<Object> value = args.at(0);
112
113 // Unwrap the receiver {value}.
114 if (value->IsJSValue()) {
115 value = handle(Handle<JSValue>::cast(value)->value(), isolate);
116 }
117 if (!value->IsNumber()) {
118 THROW_NEW_ERROR_RETURN_FAILURE(
119 isolate, NewTypeError(MessageTemplate::kNotGeneric,
120 isolate->factory()->NewStringFromAsciiChecked(
121 "Number.prototype.toLocaleString"),
122 isolate->factory()->Number_string()));
123 }
124
125 // Turn the {value} into a String.
126 return *isolate->factory()->NumberToString(value);
127 }
128
129 // ES6 section 20.1.3.5 Number.prototype.toPrecision ( precision )
BUILTIN(NumberPrototypeToPrecision)130 BUILTIN(NumberPrototypeToPrecision) {
131 HandleScope scope(isolate);
132 Handle<Object> value = args.at(0);
133 Handle<Object> precision = args.atOrUndefined(isolate, 1);
134
135 // Unwrap the receiver {value}.
136 if (value->IsJSValue()) {
137 value = handle(Handle<JSValue>::cast(value)->value(), isolate);
138 }
139 if (!value->IsNumber()) {
140 THROW_NEW_ERROR_RETURN_FAILURE(
141 isolate, NewTypeError(MessageTemplate::kNotGeneric,
142 isolate->factory()->NewStringFromAsciiChecked(
143 "Number.prototype.toPrecision"),
144 isolate->factory()->Number_string()));
145 }
146 double const value_number = value->Number();
147
148 // If no {precision} was specified, just return ToString of {value}.
149 if (precision->IsUndefined(isolate)) {
150 return *isolate->factory()->NumberToString(value);
151 }
152
153 // Convert the {precision} to an integer first.
154 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, precision,
155 Object::ToInteger(isolate, precision));
156 double const precision_number = precision->Number();
157
158 if (std::isnan(value_number)) return isolate->heap()->NaN_string();
159 if (std::isinf(value_number)) {
160 return (value_number < 0.0) ? isolate->heap()->minus_Infinity_string()
161 : isolate->heap()->Infinity_string();
162 }
163 if (precision_number < 1.0 || precision_number > kMaxFractionDigits) {
164 THROW_NEW_ERROR_RETURN_FAILURE(
165 isolate, NewRangeError(MessageTemplate::kToPrecisionFormatRange));
166 }
167 char* const str = DoubleToPrecisionCString(
168 value_number, static_cast<int>(precision_number));
169 Handle<String> result = isolate->factory()->NewStringFromAsciiChecked(str);
170 DeleteArray(str);
171 return *result;
172 }
173
174 // ES6 section 20.1.3.6 Number.prototype.toString ( [ radix ] )
BUILTIN(NumberPrototypeToString)175 BUILTIN(NumberPrototypeToString) {
176 HandleScope scope(isolate);
177 Handle<Object> value = args.at(0);
178 Handle<Object> radix = args.atOrUndefined(isolate, 1);
179
180 // Unwrap the receiver {value}.
181 if (value->IsJSValue()) {
182 value = handle(Handle<JSValue>::cast(value)->value(), isolate);
183 }
184 if (!value->IsNumber()) {
185 THROW_NEW_ERROR_RETURN_FAILURE(
186 isolate, NewTypeError(MessageTemplate::kNotGeneric,
187 isolate->factory()->NewStringFromAsciiChecked(
188 "Number.prototype.toString"),
189 isolate->factory()->Number_string()));
190 }
191 double const value_number = value->Number();
192
193 // If no {radix} was specified, just return ToString of {value}.
194 if (radix->IsUndefined(isolate)) {
195 return *isolate->factory()->NumberToString(value);
196 }
197
198 // Convert the {radix} to an integer first.
199 ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, radix,
200 Object::ToInteger(isolate, radix));
201 double const radix_number = radix->Number();
202
203 // If {radix} is 10, just return ToString of {value}.
204 if (radix_number == 10.0) return *isolate->factory()->NumberToString(value);
205
206 // Make sure the {radix} is within the valid range.
207 if (radix_number < 2.0 || radix_number > 36.0) {
208 THROW_NEW_ERROR_RETURN_FAILURE(
209 isolate, NewRangeError(MessageTemplate::kToRadixFormatRange));
210 }
211
212 // Fast case where the result is a one character string.
213 if ((IsUint32Double(value_number) && value_number < radix_number) ||
214 value_number == -0.0) {
215 // Character array used for conversion.
216 static const char kCharTable[] = "0123456789abcdefghijklmnopqrstuvwxyz";
217 return *isolate->factory()->LookupSingleCharacterStringFromCode(
218 kCharTable[static_cast<uint32_t>(value_number)]);
219 }
220
221 // Slow case.
222 if (std::isnan(value_number)) return isolate->heap()->NaN_string();
223 if (std::isinf(value_number)) {
224 return (value_number < 0.0) ? isolate->heap()->minus_Infinity_string()
225 : isolate->heap()->Infinity_string();
226 }
227 char* const str =
228 DoubleToRadixCString(value_number, static_cast<int>(radix_number));
229 Handle<String> result = isolate->factory()->NewStringFromAsciiChecked(str);
230 DeleteArray(str);
231 return *result;
232 }
233
234 } // namespace internal
235 } // namespace v8
236