libjava/sysdep/descriptor-y.h - gcc - Git at Google

 // Given a function pointer, return the code address.

 // The function descriptor is actually multiple words,
 // but we don't care about anything except the first.
 #define UNWRAP_FUNCTION_DESCRIPTOR(X)  (*(void **)(X))
	// Given a function pointer, return the code address.

	// The function descriptor is actually multiple words,
	// but we don't care about anything except the first.
	#define UNWRAP_FUNCTION_DESCRIPTOR(X) ((void *)(X))