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Side by Side Diff: runtime/platform/utils.h

Issue 2974233002: VM: Re-format to use at most one newline between functions (Closed)
Patch Set: Rebase and merge Created 3 years, 5 months ago
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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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