+: continuation->pstack-list
+ drop pair-type car ;
+
+: continuation->rstack-list
+ drop pair-type cdr ;
+
+: stack-list-len ( stack-list -- n )
+ car drop
+;
+
+: restore-param-stack ( continuation -- obj_stack )
+ continuation->pstack-list
+ 2dup >R >R
+
+ ( Allocate stack space first using psp!,
+ then copy objects from list. )
+
+ car drop 2*
+ object-stack-base @ psp0 + + psp!
+
+ R> R> 2dup cdr
+ 2swap
+ stack-list-len 1- 0 swap do
+
+ 2dup car
+ PSP0 object-stack-base @ + i 2* + 2 + !
+ PSP0 object-stack-base @ + i 2* + 1 + !
+ cdr
+
+ -1 +loop
+
+ 2drop
+;
+
+: restore-return-stack ( continuation -- )
+
+ continuation->rstack-list
+
+ 2dup cdr 2swap stack-list-len ( list n )
+
+ dup RSP0 + RSP! \ expand return stack to accommodate entries
+
+ ( list n )
+
+ 1- \ initial offset n-1
+ 0 \ final offset 0
+ swap
+ do
+ 2dup cdr 2swap car drop
+ RSP0 i 1+ + !
+ -1 +loop
+
+ 2drop
+;
+
+: restore-continuation-with-arg ( continuation obj -- )
+
+ >R >R \ Store obj on return stack
+
+ 2dup >R >R \ Store copy of continuation on return stack
+
+ restore-param-stack
+
+ R> R> \ Pop continuation from return stack
+
+ R> R> \ Pop obj from return stack
+
+ 2swap
+
+ restore-return-stack