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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef PLATFORM_UTILS_H_ | 5 #ifndef PLATFORM_UTILS_H_ |
6 #define PLATFORM_UTILS_H_ | 6 #define PLATFORM_UTILS_H_ |
7 | 7 |
8 #include "platform/assert.h" | 8 #include "platform/assert.h" |
9 #include "platform/globals.h" | 9 #include "platform/globals.h" |
10 | 10 |
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164 // without the risk of integer overflow. | 164 // without the risk of integer overflow. |
165 static inline bool RangeCheck(intptr_t offset, | 165 static inline bool RangeCheck(intptr_t offset, |
166 intptr_t count, | 166 intptr_t count, |
167 intptr_t length) { | 167 intptr_t length) { |
168 return offset >= 0 && | 168 return offset >= 0 && |
169 count >= 0 && | 169 count >= 0 && |
170 length >= 0 && | 170 length >= 0 && |
171 count <= (length - offset); | 171 count <= (length - offset); |
172 } | 172 } |
173 | 173 |
| 174 static inline bool WillAddOverflow(int64_t a, int64_t b) { |
| 175 return ((b > 0) && (a > (kMaxInt64 - b))) || |
| 176 ((b < 0) && (a < (kMinInt64 - b))); |
| 177 } |
| 178 |
| 179 static inline bool WillSubOverflow(int64_t a, int64_t b) { |
| 180 return ((b > 0) && (a < (kMinInt64 + b))) || |
| 181 ((b < 0) && (a > (kMaxInt64 + b))); |
| 182 } |
| 183 |
| 184 |
174 // Utility functions for converting values from host endianess to | 185 // Utility functions for converting values from host endianess to |
175 // big or little endian values. | 186 // big or little endian values. |
176 static uint16_t HostToBigEndian16(uint16_t host_value); | 187 static uint16_t HostToBigEndian16(uint16_t host_value); |
177 static uint32_t HostToBigEndian32(uint32_t host_value); | 188 static uint32_t HostToBigEndian32(uint32_t host_value); |
178 static uint64_t HostToBigEndian64(uint64_t host_value); | 189 static uint64_t HostToBigEndian64(uint64_t host_value); |
179 static uint16_t HostToLittleEndian16(uint16_t host_value); | 190 static uint16_t HostToLittleEndian16(uint16_t host_value); |
180 static uint32_t HostToLittleEndian32(uint32_t host_value); | 191 static uint32_t HostToLittleEndian32(uint32_t host_value); |
181 static uint64_t HostToLittleEndian64(uint64_t host_value); | 192 static uint64_t HostToLittleEndian64(uint64_t host_value); |
182 | 193 |
183 static bool DoublesBitEqual(const double a, const double b) { | 194 static bool DoublesBitEqual(const double a, const double b) { |
184 return bit_cast<int64_t, double>(a) == bit_cast<int64_t, double>(b); | 195 return bit_cast<int64_t, double>(a) == bit_cast<int64_t, double>(b); |
185 } | 196 } |
186 }; | 197 }; |
187 | 198 |
188 } // namespace dart | 199 } // namespace dart |
189 | 200 |
190 #if defined(TARGET_OS_ANDROID) | 201 #if defined(TARGET_OS_ANDROID) |
191 #include "platform/utils_android.h" | 202 #include "platform/utils_android.h" |
192 #elif defined(TARGET_OS_LINUX) | 203 #elif defined(TARGET_OS_LINUX) |
193 #include "platform/utils_linux.h" | 204 #include "platform/utils_linux.h" |
194 #elif defined(TARGET_OS_MACOS) | 205 #elif defined(TARGET_OS_MACOS) |
195 #include "platform/utils_macos.h" | 206 #include "platform/utils_macos.h" |
196 #elif defined(TARGET_OS_WINDOWS) | 207 #elif defined(TARGET_OS_WINDOWS) |
197 #include "platform/utils_win.h" | 208 #include "platform/utils_win.h" |
198 #else | 209 #else |
199 #error Unknown target os. | 210 #error Unknown target os. |
200 #endif | 211 #endif |
201 | 212 |
202 #endif // PLATFORM_UTILS_H_ | 213 #endif // PLATFORM_UTILS_H_ |
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