JS_ALWAYS_INLINE
December 4th, 2012
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在SpiderMonkey的代码库中经常可以看到一个函数名前面定义了一个宏 JS_ALWAYS_INLINE，这个宏定义在js/src/jstypes.h中：
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#define JS_ALWAYS_INLINE MOZ_ALWAYS_INLINE |
而 MOZ_ALWAYS_INLINE 定义在mfbt/Attributes.h中：
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/* * MOZ_ALWAYS_INLINE is a macro which expands to tell the compiler that the * method decorated with it must be inlined, even if the compiler thinks * otherwise. This is only a (much) stronger version of the MOZ_INLINE hint: * compilers are not guaranteed to respect it (although they're much more likely * to do so). */ #if defined(DEBUG) # define MOZ_ALWAYS_INLINE MOZ_INLINE #elif defined(_MSC_VER) # define MOZ_ALWAYS_INLINE __forceinline #elif defined(__GNUC__) # define MOZ_ALWAYS_INLINE __attribute__((always_inline)) MOZ_INLINE #else # define MOZ_ALWAYS_INLINE MOZ_INLINE #endif |
而这里的 MOZ_INLINE 也定义在mfbt/Attributes.h中：
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/* * MOZ_INLINE is a macro which expands to tell the compiler that the method * decorated with it should be inlined. This macro is usable from C and C++ * code, even though C89 does not support the |inline| keyword. The compiler * may ignore this directive if it chooses. */ #if defined(__cplusplus) # define MOZ_INLINE inline #elif defined(_MSC_VER) # define MOZ_INLINE __inline #elif defined(__GNUC__) # define MOZ_INLINE __inline__ #else # define MOZ_INLINE inline #endif |
这个定义文件放在mfbt目录下，这个目录的全称是“Mozilla Framework Based on Templates (MFBT)”，作用在[1]中有解释：
The Mozilla Framework Based on Templates (“mfbt”) is the central repository for macros, functions, and data structures used throughout Mozilla code, including in the JavaScript engine.
[1]: https://developer.mozilla.org/en-US/docs/Mozilla/MFBT
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