Value type struct inputs, for PowerPC

library/alien/structs.factor

@@ -36,6 +36,7 @@ sequences strings words ;
         bootstrap-cell "align" set
         [ swap <displaced-alien> ] "getter" set
         "width" get [ %unbox-struct ] curry "unboxer" set
+        "width" get [ %box-struct ] curry "boxer" set
         "struct" on
     ] "struct-name" get define-c-type
     "struct-name" get in get init-c-type ;

library/compiler/ppc/alien.factor

@@ -36,14 +36,18 @@ M: %unbox generate-node ( vop -- )
     ! Store the return value on the C stack
     0 input 1 input [ return-reg ] keep freg>stack ;
 
-M: %unbox-struct generate-node ( vop -- )
-    drop
+: struct-ptr/size ( func -- )
     ! Load destination address
     3 1 0 input stack@ ADDI
     ! Load struct size
     2 input 4 LI
-    ! Copy the struct to the stack
-    "unbox_value_struct" f compile-c-call ;
+    f compile-c-call ;
+
+M: %unbox-struct generate-node ( vop -- )
+    drop "unbox_value_struct" struct-ptr/size ;
+
+M: %box-struct generate-node ( vop -- )
+    drop "box_value_struct" struct-ptr/size ;
 
 : (%move) 0 input 1 input 2 input [ fastcall-regs nth ] keep ;
 

library/compiler/vops.factor

@@ -375,6 +375,11 @@ TUPLE: %box ;
 C: %box make-vop ;
 : %box ( n reg-class func -- vop ) 3-in-vop <%box> ;
 
+TUPLE: %box-struct ;
+C: %box-struct make-vop ;
+: %box-struct ( n reg-class size -- vop )
+    3-in-vop <%box-struct> ;
+
 TUPLE: %alien-invoke ;
 C: %alien-invoke make-vop ;
 : %alien-invoke ( func lib -- vop ) 2-in-vop <%alien-invoke> ;

library/test/compiler/callbacks.factor

@@ -109,3 +109,20 @@ FUNCTION: void callback_test_4 void* callback int a1 int a2 int a3 int a4 int a5
         "stack" get
     ] with-scope
 ] unit-test
+
+BEGIN-STRUCT: foo
+    FIELD: int x
+    FIELD: int y
+END-STRUCT
+
+: make-foo ( x y -- foo )
+    "foo" <c-object> [ set-foo-y ] keep [ set-foo-x ] keep ;
+
+: callback-10
+    "int"
+    { "foo" }
+    [ dup foo-x swap foo-y / ] alien-callback ; compiled
+
+FUNCTION: int callback_test_8 void* callback foo x ;
+
+[ 5 ] [ callback-10 10 2 make-foo callback_test_8 ] unit-test

native/alien.c

@@ -151,3 +151,13 @@ void unbox_value_struct(void *dest, CELL size)
 {
 	memcpy(dest,unbox_alien(),size);
 }
+
+/* for FFI callbacks receiving structs by value */
+void box_value_struct(void *src, CELL size)
+{
+	F_ARRAY *array;
+	maybe_gc(0);
+	array = byte_array(size);
+	memcpy(array + 1,src,size);
+	dpush(tag_object(array));
+}

native/alien.h

@@ -53,3 +53,4 @@ void primitive_alien_double(void);
 void primitive_set_alien_double(void);
 
 DLLEXPORT void unbox_value_struct(void *dest, CELL size);
+DLLEXPORT void box_value_struct(void *src, CELL size);

native/array.c

@@ -1,8 +1,8 @@
 #include "factor.h"
 
 /* the array is full of undefined data, and must be correctly filled before the
-next GC. */
-F_ARRAY* allot_array(CELL type, F_FIXNUM capacity)
+next GC. size is in cells */
+F_ARRAY *allot_array(CELL type, F_FIXNUM capacity)
 {
 	F_ARRAY *array;
 
@@ -24,6 +24,13 @@ F_ARRAY* array(CELL type, F_FIXNUM capacity, CELL fill)
 	return array;
 }
 
+/* size is in bytes this time */
+F_ARRAY *byte_array(F_FIXNUM size)
+{
+	F_FIXNUM byte_size = (size + sizeof(CELL) - 1) / sizeof(CELL);
+	return array(BYTE_ARRAY_TYPE,byte_size,0);
+}
+
 /* push a new array on the stack */
 void primitive_array(void)
 {
@@ -47,9 +54,8 @@ void primitive_tuple(void)
 void primitive_byte_array(void)
 {
 	F_FIXNUM size = to_fixnum(dpop());
-	maybe_gc(array_size(size));
-	F_FIXNUM byte_size = (size + sizeof(CELL) - 1) / sizeof(CELL);
-	dpush(tag_object(array(BYTE_ARRAY_TYPE,byte_size,0)));
+	maybe_gc(0);
+	dpush(tag_object(byte_array(size)));
 }
 
 F_ARRAY* resize_array(F_ARRAY* array, F_FIXNUM capacity, CELL fill)

native/array.h

@@ -25,8 +25,9 @@ INLINE CELL array_size(CELL size)
 	return align8(sizeof(F_ARRAY) + size * CELLS);
 }
 
-F_ARRAY* allot_array(CELL type, F_FIXNUM capacity);
-F_ARRAY* array(CELL type, F_FIXNUM capacity, CELL fill);
+F_ARRAY *allot_array(CELL type, F_FIXNUM capacity);
+F_ARRAY *array(CELL type, F_FIXNUM capacity, CELL fill);
+F_ARRAY *byte_array(F_FIXNUM size);
 
 void primitive_array(void);
 void primitive_tuple(void);

native/ffi_test.c

@@ -150,3 +150,12 @@ double callback_test_7(double (*callback)(void))
 	printf("callback_test_7 exit\n");
 	return x;
 }
+
+int callback_test_8(int (*callback)(struct foo x), struct foo x)
+{
+	int x;
+	printf("callback_test_8 entry\n");
+	x = callback(x);
+	printf("callback_test_8 exit\n");
+	return x;
+}

native/ffi_test.h

@@ -21,3 +21,4 @@ DLLEXPORT void callback_test_4(void (*callback)(int a1, int a2, int a3, int a4,
 DLLEXPORT int callback_test_5(int (*callback)(void));
 DLLEXPORT float callback_test_6(float (*callback)(void));
 DLLEXPORT double callback_test_7(double (*callback)(void));
+DLLEXPORT int callback_test_8(int (*callback)(struct foo x), struct foo x);