txr - TXR: A data munging language.

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*	ffi: malloc-free variants for str, dstr and buf.	Kaz Kylheku	2017-04-29	1	-1/+3
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	The FFI types str-d, wstr-d and buf-d are like their unsuffixed counterparts, but indicate that ownership of a dynamically allocated object is being passed which the receiver is responsible for freeing. If we pass a str, wstr or buf into a foreign function, we are generally only guaranteeing the lifetime of the buffer over the function call. If we pass a str-d or buf-d, then the callee keeps the pointer indefinitely, and must free it. If we get str or buf return value from a function, it is assumed that the pointer is static or something borrowed with some limited lifetime. A copy of it is made. If we get a str-d, wstr-d or buf-d, it is assumed that the pointer has been malloc-ed for us. The object is either duplicated, and the original one immediately freed, or else the pointer is retained directly in the Lisp object and freed if that object becomes garbage. * ffi.c (str_d_s, wstr_d_s, buf_d_s): New symbol variables. (ffi_str_get): Coalesce assignment with declaration. (ffi_str_d_get, ffi_str_d_put): New static functions. (ffi_buf_d_get, ffi_buf_d_put): New static functions. (ffi_type_compile): Handle buf_d_s, str_d_s and wstr_d_s. (ffi_init): Initialize str_d_s, wstr_d_s and buf_d_s. * ffi.c (str_d_s, wstr_d_s, buf_d_s): Declared.
*	ffi: fix problems caught by g++.	Kaz Kylheku	2017-04-27	1	-1/+1
\| \| \| \| \| \| \| \| \| \| \| \| \| \|	* ffi.c (float_s): Variable removed. This is a duplicate definition; we already have this symbol in lib.c. (ffi_type_s): Duplicate definition removed; it is repeated two lines below. (ffi_str_put): Remove pointless const qualifier on u8s variable. (ffi_call_wrap): Cast return value of alloca. Also, rc pointer needs to be cast to mem_t . (ffi_init): Remove initialization of float_s. ffi.h (float_s): Declaration removed.
*	ffi: array support.	Kaz Kylheku	2017-04-26	1	-0/+2
\| \| \| \| \| \| \| \| \| \| \|	* ffi.c (array_s): New symbol variable. (ffi_array_put, ffi_array_get, ffi_array_fill, make_ffi_type_array): New static functions. (ffi_type_compile): Support (array <dim> <type>) syntax. (ffi_init): Initialize array_s. * ffi.h (array_s): Declared.
*	Start of FFI implementation based on libffi.	Kaz Kylheku	2017-04-24	1	-0/+51
	* Makefile (OBJS): Add ffi.o. * configure (have_libffi): New variable. (gen_config_make): Generate have_libffi make variable. New check for availability of libffi. * ffi.c, ffi.h: New files. * lib.c (init): Call ffi_init.