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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef V8_BASE_COMPILER_SPECIFIC_H_ |
| 6 #define V8_BASE_COMPILER_SPECIFIC_H_ |
| 7 |
| 8 #include "include/v8config.h" |
| 9 |
| 10 // Annotate a variable indicating it's ok if the variable is not used. |
| 11 // (Typically used to silence a compiler warning when the assignment |
| 12 // is important for some other reason.) |
| 13 // Use like: |
| 14 // int x ALLOW_UNUSED = ...; |
| 15 #if V8_HAS_ATTRIBUTE_UNUSED |
| 16 #define ALLOW_UNUSED __attribute__((unused)) |
| 17 #else |
| 18 #define ALLOW_UNUSED |
| 19 #endif |
| 20 |
| 21 |
| 22 // Annotate a virtual method indicating it must be overriding a virtual |
| 23 // method in the parent class. |
| 24 // Use like: |
| 25 // virtual void bar() OVERRIDE; |
| 26 #if V8_HAS_CXX11_OVERRIDE |
| 27 #define OVERRIDE override |
| 28 #else |
| 29 #define OVERRIDE /* NOT SUPPORTED */ |
| 30 #endif |
| 31 |
| 32 |
| 33 // Annotate a virtual method indicating that subclasses must not override it, |
| 34 // or annotate a class to indicate that it cannot be subclassed. |
| 35 // Use like: |
| 36 // class B FINAL : public A {}; |
| 37 // virtual void bar() FINAL; |
| 38 #if V8_HAS_CXX11_FINAL |
| 39 #define FINAL final |
| 40 #elif V8_HAS___FINAL |
| 41 #define FINAL __final |
| 42 #elif V8_HAS_SEALED |
| 43 #define FINAL sealed |
| 44 #else |
| 45 #define FINAL /* NOT SUPPORTED */ |
| 46 #endif |
| 47 |
| 48 |
| 49 // Annotate a function indicating the caller must examine the return value. |
| 50 // Use like: |
| 51 // int foo() WARN_UNUSED_RESULT; |
| 52 #if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT |
| 53 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) |
| 54 #else |
| 55 #define WARN_UNUSED_RESULT /* NOT SUPPORTED */ |
| 56 #endif |
| 57 |
| 58 #endif // V8_BASE_COMPILER_SPECIFIC_H_ |
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