Using the built-in functions described below, you can record the arguments a function received, and call another function with the same arguments, without knowing the number or types of the arguments.
You can also record the return value of that function call, and later return that value, without knowing what data type the function tried to return (as long as your caller expects that data type).
|void * __builtin_apply_args ()||Built-in Function|
This built-in function returns a pointer to data
describing how to perform a call with the same arguments as were passed
to the current function.
The function saves the arg pointer register, structure value address, and all registers that might be used to pass arguments to a function into a block of memory allocated on the stack. Then it returns the address of that block.
|void * __builtin_apply (void (*function)(), void *arguments, size_t size)||Built-in Function|
This built-in function invokes function
with a copy of the parameters described by arguments
The value of arguments should be the value returned by
This function returns a pointer to data describing how to return whatever value was returned by function. The data is saved in a block of memory allocated on the stack.
It is not always simple to compute the proper value for size. The
value is used by
|void __builtin_return (void *result)||Built-in Function|
This built-in function returns the value described by result from
the containing function. You should specify, for result, a value
returned by |