| // This code is compiled directly on many platforms, including client |
| // platforms like Windows, Mac, and embedded systems. Before making |
| // any changes here, make sure that you're not breaking any platforms. |
| // |
| |
| #ifndef DYNAMIC_DEPTH_INTERNAL_BASE_MACROS_H_ // NOLINT |
| #define DYNAMIC_DEPTH_INTERNAL_BASE_MACROS_H_ // NOLINT |
| |
| #include <stddef.h> // For size_t |
| #include "base/port.h" |
| |
| // The FALLTHROUGH_INTENDED macro can be used to annotate implicit fall-through |
| // between switch labels: |
| // switch (x) { |
| // case 40: |
| // case 41: |
| // if (truth_is_out_there) { |
| // ++x; |
| // FALLTHROUGH_INTENDED; // Use instead of/along with annotations in |
| // // comments. |
| // } else { |
| // return x; |
| // } |
| // case 42: |
| // ... |
| // |
| // As shown in the example above, the FALLTHROUGH_INTENDED macro should be |
| // followed by a semicolon. It is designed to mimic control-flow statements |
| // like 'break;', so it can be placed in most places where 'break;' can, but |
| // only if there are no statements on the execution path between it and the |
| // next switch label. |
| // |
| // When compiled with clang in C++11 mode, the FALLTHROUGH_INTENDED macro is |
| // expanded to [[clang::fallthrough]] attribute, which is analysed when |
| // performing switch labels fall-through diagnostic ('-Wimplicit-fallthrough'). |
| // See clang documentation on language extensions for details: |
| // http://clang.llvm.org/docs/AttributeReference.html#fallthrough-clang-fallthrough |
| // |
| // When used with unsupported compilers, the FALLTHROUGH_INTENDED macro has no |
| // effect on diagnostics. |
| // |
| // In either case this macro has no effect on runtime behavior and performance |
| // of code. |
| #if defined(__clang__) && defined(LANG_CXX11) && defined(__has_warning) |
| #if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough") |
| #define FALLTHROUGH_INTENDED [[clang::fallthrough]] // NOLINT |
| #endif |
| #endif |
| |
| #ifndef FALLTHROUGH_INTENDED // NOLINT |
| #define FALLTHROUGH_INTENDED \ |
| do { \ |
| } while (0) |
| #endif |
| |
| #endif // DYNAMIC_DEPTH_INTERNAL_BASE_MACROS_H_ // NOLINT |