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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_COMPILER_SPECIFIC_H_ | 5 #ifndef V8_BASE_COMPILER_SPECIFIC_H_ |
| 6 #define V8_BASE_COMPILER_SPECIFIC_H_ | 6 #define V8_BASE_COMPILER_SPECIFIC_H_ |
| 7 | 7 |
| 8 #include "include/v8config.h" | 8 #include "include/v8config.h" |
| 9 | 9 |
| 10 // Annotate a typedef or function indicating it's ok if it's not used. | 10 // Annotate a typedef or function indicating it's ok if it's not used. |
| 11 // Use like: | 11 // Use like: |
| 12 // typedef Foo Bar ALLOW_UNUSED_TYPE; | 12 // typedef Foo Bar ALLOW_UNUSED_TYPE; |
| 13 #if V8_HAS_ATTRIBUTE_UNUSED | 13 #if V8_HAS_ATTRIBUTE_UNUSED |
| 14 #define ALLOW_UNUSED_TYPE __attribute__((unused)) | 14 #define ALLOW_UNUSED_TYPE __attribute__((unused)) |
| 15 #else | 15 #else |
| 16 #define ALLOW_UNUSED_TYPE | 16 #define ALLOW_UNUSED_TYPE |
| 17 #endif | 17 #endif |
| 18 | 18 |
| 19 | 19 |
| 20 // Annotate a function indicating the caller must examine the return value. | 20 // Annotate a function indicating the caller must examine the return value. |
| 21 // Use like: | 21 // Use like: |
| 22 // int foo() WARN_UNUSED_RESULT; | 22 // int foo() WARN_UNUSED_RESULT; |
| 23 #if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT | 23 #if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT |
| 24 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) | 24 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) |
| 25 #else | 25 #else |
| 26 #define WARN_UNUSED_RESULT /* NOT SUPPORTED */ | 26 #define WARN_UNUSED_RESULT /* NOT SUPPORTED */ |
| 27 #endif | 27 #endif |
| 28 | 28 |
| 29 // Tell the compiler a function is using a printf-style format string. | |
| 30 // |format_param| is the one-based index of the format string parameter; | |
| 31 // |dots_param| is the one-based index of the "..." parameter. | |
| 32 // For v*printf functions (which take a va_list), pass 0 for dots_param. | |
| 33 // (This is undocumented but matches what the system C headers do.) | |
| 34 #if defined(__GNUC__) | |
| 35 #define PRINTF_FORMAT(format_param, dots_param) \ | |
| 36 __attribute__((format(printf, format_param, dots_param))) | |
| 37 #else | |
| 38 #define PRINTF_FORMAT(format_param, dots_param) | |
| 39 #endif | |
| 40 | 29 |
| 41 // The C++ standard requires that static const members have an out-of-class | 30 // The C++ standard requires that static const members have an out-of-class |
| 42 // definition (in a single compilation unit), but MSVC chokes on this (when | 31 // definition (in a single compilation unit), but MSVC chokes on this (when |
| 43 // language extensions, which are required, are enabled). (You're only likely to | 32 // language extensions, which are required, are enabled). (You're only likely to |
| 44 // notice the need for a definition if you take the address of the member or, | 33 // notice the need for a definition if you take the address of the member or, |
| 45 // more commonly, pass it to a function that takes it as a reference argument -- | 34 // more commonly, pass it to a function that takes it as a reference argument -- |
| 46 // probably an STL function.) This macro makes MSVC do the right thing. See | 35 // probably an STL function.) This macro makes MSVC do the right thing. See |
| 47 // http://msdn.microsoft.com/en-us/library/34h23df8(v=vs.100).aspx for more | 36 // http://msdn.microsoft.com/en-us/library/34h23df8(v=vs.100).aspx for more |
| 48 // information. Use like: | 37 // information. Use like: |
| 49 // | 38 // |
| 50 // In .h file: | 39 // In .h file: |
| 51 // struct Foo { | 40 // struct Foo { |
| 52 // static const int kBar = 5; | 41 // static const int kBar = 5; |
| 53 // }; | 42 // }; |
| 54 // | 43 // |
| 55 // In .cc file: | 44 // In .cc file: |
| 56 // STATIC_CONST_MEMBER_DEFINITION const int Foo::kBar; | 45 // STATIC_CONST_MEMBER_DEFINITION const int Foo::kBar; |
| 57 #if V8_HAS_DECLSPEC_SELECTANY | 46 #if V8_HAS_DECLSPEC_SELECTANY |
| 58 #define STATIC_CONST_MEMBER_DEFINITION __declspec(selectany) | 47 #define STATIC_CONST_MEMBER_DEFINITION __declspec(selectany) |
| 59 #else | 48 #else |
| 60 #define STATIC_CONST_MEMBER_DEFINITION | 49 #define STATIC_CONST_MEMBER_DEFINITION |
| 61 #endif | 50 #endif |
| 62 | 51 |
| 63 #endif // V8_BASE_COMPILER_SPECIFIC_H_ | 52 #endif // V8_BASE_COMPILER_SPECIFIC_H_ |
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