Hi everyone,
After recently changing to a threadsafe malloc, I'd like to use it
for all C++ allocations in WebCore/JavaScriptCore. Darin suggested a
neat trick for doing this, where we can do a private declaration of
operator new, so it won't affect outside C++ code:
#if __GNUC__
#define PRIVATE_INLINE __private_extern__ inline __attribute__
((always_inline))
#else
#define PRIVATE_INLINE inline
#endif
PRIVATE_INLINE void* operator new(size_t s) { return fastMalloc(s); }
PRIVATE_INLINE void operator delete(void* p) { fastFree(p); }
PRIVATE_INLINE void* operator new[](size_t s) { return fastMalloc(s); }
PRIVATE_INLINE void operator delete[](void* p) { fastFree(p); }
Note that the operator declarations are inline, so the header that
contains this must be included in every C++ implementation file (or
you could get new/delete mismatches which would lead to crashes or
random memory trashing).
On Mac OS X, the easiest way to do this is to make sure these
definitions are included in the per-project prefix header. The Xcode
build system will tell gcc to make a precompiled header out of this,
and then automatically pass it as a prefix header to all gcc
invocations. I don't know if other build systems have anything
analogous. Another possible alternative is to make sure these
declarations go in config.h, and then force every source file to
include it. But that's a little ugly and furthermore hard to
maintain, since forgetting a config.h include will not lead to a
build failure but will cause incorrect code to be generated.
So does anyone have any experience here? I'd like the solution to
work at least on Linux, Windows and Symbian Series 60.
Regards,
Maciej
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