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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 RUNTIME_PLATFORM_UTILS_H_ | 5 #ifndef RUNTIME_PLATFORM_UTILS_H_ |
| 6 #define RUNTIME_PLATFORM_UTILS_H_ | 6 #define RUNTIME_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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| 176 static inline bool WillAddOverflow(int64_t a, int64_t b) { | 176 static inline bool WillAddOverflow(int64_t a, int64_t b) { |
| 177 return ((b > 0) && (a > (kMaxInt64 - b))) || | 177 return ((b > 0) && (a > (kMaxInt64 - b))) || |
| 178 ((b < 0) && (a < (kMinInt64 - b))); | 178 ((b < 0) && (a < (kMinInt64 - b))); |
| 179 } | 179 } |
| 180 | 180 |
| 181 static inline bool WillSubOverflow(int64_t a, int64_t b) { | 181 static inline bool WillSubOverflow(int64_t a, int64_t b) { |
| 182 return ((b > 0) && (a < (kMinInt64 + b))) || | 182 return ((b > 0) && (a < (kMinInt64 + b))) || |
| 183 ((b < 0) && (a > (kMaxInt64 + b))); | 183 ((b < 0) && (a > (kMaxInt64 + b))); |
| 184 } | 184 } |
| 185 | 185 |
| 186 | |
| 187 // Adds two int64_t values with wrapping around | 186 // Adds two int64_t values with wrapping around |
| 188 // (two's complement arithmetic). | 187 // (two's complement arithmetic). |
| 189 static inline int64_t AddWithWrapAround(int64_t a, int64_t b) { | 188 static inline int64_t AddWithWrapAround(int64_t a, int64_t b) { |
| 190 // Avoid undefined behavior by doing arithmetic in the unsigned type. | 189 // Avoid undefined behavior by doing arithmetic in the unsigned type. |
| 191 return static_cast<int64_t>(static_cast<uint64_t>(a) + | 190 return static_cast<int64_t>(static_cast<uint64_t>(a) + |
| 192 static_cast<uint64_t>(b)); | 191 static_cast<uint64_t>(b)); |
| 193 } | 192 } |
| 194 | 193 |
| 195 | |
| 196 // Subtracts two int64_t values with wrapping around | 194 // Subtracts two int64_t values with wrapping around |
| 197 // (two's complement arithmetic). | 195 // (two's complement arithmetic). |
| 198 static inline int64_t SubWithWrapAround(int64_t a, int64_t b) { | 196 static inline int64_t SubWithWrapAround(int64_t a, int64_t b) { |
| 199 // Avoid undefined behavior by doing arithmetic in the unsigned type. | 197 // Avoid undefined behavior by doing arithmetic in the unsigned type. |
| 200 return static_cast<int64_t>(static_cast<uint64_t>(a) - | 198 return static_cast<int64_t>(static_cast<uint64_t>(a) - |
| 201 static_cast<uint64_t>(b)); | 199 static_cast<uint64_t>(b)); |
| 202 } | 200 } |
| 203 | 201 |
| 204 | |
| 205 // Multiplies two int64_t values with wrapping around | 202 // Multiplies two int64_t values with wrapping around |
| 206 // (two's complement arithmetic). | 203 // (two's complement arithmetic). |
| 207 static inline int64_t MulWithWrapAround(int64_t a, int64_t b) { | 204 static inline int64_t MulWithWrapAround(int64_t a, int64_t b) { |
| 208 // Avoid undefined behavior by doing arithmetic in the unsigned type. | 205 // Avoid undefined behavior by doing arithmetic in the unsigned type. |
| 209 return static_cast<int64_t>(static_cast<uint64_t>(a) * | 206 return static_cast<int64_t>(static_cast<uint64_t>(a) * |
| 210 static_cast<uint64_t>(b)); | 207 static_cast<uint64_t>(b)); |
| 211 } | 208 } |
| 212 | 209 |
| 213 | |
| 214 // Shifts int64_t value left. Supports any non-negative number of bits and | 210 // Shifts int64_t value left. Supports any non-negative number of bits and |
| 215 // silently discards shifted out bits. | 211 // silently discards shifted out bits. |
| 216 static inline int64_t ShiftLeftWithTruncation(int64_t a, int64_t b) { | 212 static inline int64_t ShiftLeftWithTruncation(int64_t a, int64_t b) { |
| 217 ASSERT(b >= 0); | 213 ASSERT(b >= 0); |
| 218 if (b >= kBitsPerInt64) { | 214 if (b >= kBitsPerInt64) { |
| 219 return 0; | 215 return 0; |
| 220 } | 216 } |
| 221 // Avoid undefined behavior by doing arithmetic in the unsigned type. | 217 // Avoid undefined behavior by doing arithmetic in the unsigned type. |
| 222 return static_cast<int64_t>(static_cast<uint64_t>(a) << b); | 218 return static_cast<int64_t>(static_cast<uint64_t>(a) << b); |
| 223 } | 219 } |
| 224 | 220 |
| 225 | |
| 226 // Utility functions for converting values from host endianness to | 221 // Utility functions for converting values from host endianness to |
| 227 // big or little endian values. | 222 // big or little endian values. |
| 228 static uint16_t HostToBigEndian16(uint16_t host_value); | 223 static uint16_t HostToBigEndian16(uint16_t host_value); |
| 229 static uint32_t HostToBigEndian32(uint32_t host_value); | 224 static uint32_t HostToBigEndian32(uint32_t host_value); |
| 230 static uint64_t HostToBigEndian64(uint64_t host_value); | 225 static uint64_t HostToBigEndian64(uint64_t host_value); |
| 231 static uint16_t HostToLittleEndian16(uint16_t host_value); | 226 static uint16_t HostToLittleEndian16(uint16_t host_value); |
| 232 static uint32_t HostToLittleEndian32(uint32_t host_value); | 227 static uint32_t HostToLittleEndian32(uint32_t host_value); |
| 233 static uint64_t HostToLittleEndian64(uint64_t host_value); | 228 static uint64_t HostToLittleEndian64(uint64_t host_value); |
| 234 | 229 |
| 235 static bool DoublesBitEqual(const double a, const double b) { | 230 static bool DoublesBitEqual(const double a, const double b) { |
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| 255 #include "platform/utils_linux.h" | 250 #include "platform/utils_linux.h" |
| 256 #elif defined(HOST_OS_MACOS) | 251 #elif defined(HOST_OS_MACOS) |
| 257 #include "platform/utils_macos.h" | 252 #include "platform/utils_macos.h" |
| 258 #elif defined(HOST_OS_WINDOWS) | 253 #elif defined(HOST_OS_WINDOWS) |
| 259 #include "platform/utils_win.h" | 254 #include "platform/utils_win.h" |
| 260 #else | 255 #else |
| 261 #error Unknown target os. | 256 #error Unknown target os. |
| 262 #endif | 257 #endif |
| 263 | 258 |
| 264 #endif // RUNTIME_PLATFORM_UTILS_H_ | 259 #endif // RUNTIME_PLATFORM_UTILS_H_ |
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