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_ 59