[Libjit] RFC: type safety

[Alexey Galakhov]

Hi,

Ok, there have been issues in cache memory manager due to unsafe
typecasts. The worst one was _jit_cache_extend which was declared
returning void but used as returning int. Fortunately its return value
was unused.

I removed virtually all unsafe type handling in cache manager. The patch
is attached. Now there are no more untyped pointers so that the compiler
is able to generate warnings/errors.

I used the following technique:

typedef struct _interface_fake *interface_t;

typedef struct _implementation *implementation_t;
struct _implementation {
   // ...
};

static inline interface_t to_interface(implementation_t x);
static inline implementation_t to_implementation(interface_t x);

Regards,
Alex

0001-Ensure-type-safety-in-memory-manager.patch
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