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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_BASE_MACROS_H_ | 5 #ifndef V8_BASE_MACROS_H_ |
6 #define V8_BASE_MACROS_H_ | 6 #define V8_BASE_MACROS_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 #include <stdint.h> | 9 #include <stdint.h> |
10 | 10 |
11 #include <cstring> | 11 #include <cstring> |
12 | 12 |
13 #include "src/base/build_config.h" | 13 #include "src/base/build_config.h" |
14 #include "src/base/compiler-specific.h" | 14 #include "src/base/compiler-specific.h" |
15 #include "src/base/logging.h" | 15 #include "src/base/logging.h" |
16 | 16 |
17 | 17 |
18 // The expression OFFSET_OF(type, field) computes the byte-offset | 18 // The expression OFFSET_OF(type, field) computes the byte-offset |
19 // of the specified field relative to the containing type. This | 19 // of the specified field relative to the containing type. This |
20 // corresponds to 'offsetof' (in stddef.h), except that it doesn't | 20 // corresponds to 'offsetof' (in stddef.h), except that it doesn't |
21 // use 0 or NULL, which causes a problem with the compiler warnings | 21 // use 0 or NULL, which causes a problem with the compiler warnings |
22 // we have enabled (which is also why 'offsetof' doesn't seem to work). | 22 // we have enabled (which is also why 'offsetof' doesn't seem to work). |
23 // Here we simply use the non-zero value 4, which seems to work. | 23 // Here we simply use the aligned, non-zero value 16. |
24 #define OFFSET_OF(type, field) \ | 24 #define OFFSET_OF(type, field) \ |
25 (reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(4)->field)) - 4) | 25 (reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(16)->field)) - 16) |
26 | 26 |
27 | 27 |
28 #if V8_OS_NACL | 28 #if V8_OS_NACL |
29 | 29 |
30 // ARRAYSIZE_UNSAFE performs essentially the same calculation as arraysize, | 30 // ARRAYSIZE_UNSAFE performs essentially the same calculation as arraysize, |
31 // but can be used on anonymous types or types defined inside | 31 // but can be used on anonymous types or types defined inside |
32 // functions. It's less safe than arraysize as it accepts some | 32 // functions. It's less safe than arraysize as it accepts some |
33 // (although not all) pointers. Therefore, you should use arraysize | 33 // (although not all) pointers. Therefore, you should use arraysize |
34 // whenever possible. | 34 // whenever possible. |
35 // | 35 // |
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409 } | 409 } |
410 | 410 |
411 template <> | 411 template <> |
412 inline bool is_fundamental<uint8_t>() { | 412 inline bool is_fundamental<uint8_t>() { |
413 return true; | 413 return true; |
414 } | 414 } |
415 } | 415 } |
416 } // namespace v8::base | 416 } // namespace v8::base |
417 | 417 |
418 #endif // V8_BASE_MACROS_H_ | 418 #endif // V8_BASE_MACROS_H_ |
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