flan/test/programs/dev-globals.flan

40 lines
1.4 KiB
Plaintext

;;;; A program that stops with state worth looking at *outside* the frame.
;;;;
;;;; dev-locals.flan is about what one frame holds. This is about what the
;;;; whole stopped stack is reading, which in this language is most of the
;;;; program: a game keeps its state in top-level defonces, and sand.flan holds
;;;; its entire grid that way.
;;;;
;;;; The globals are declared in an order the answer must *not* come back in.
;;;; [label] is written first and is touched only by [main], the outer frame,
;;;; so ordering by the innermost frame that touches it has to put it last;
;;;; [grid] and [pressure] are both innermost-touched and must keep the order
;;;; they are declared in. [untouched] is read by no frame on the stack and
;;;; must not appear at all — that is the whole claim of scoping the section to
;;;; the stack rather than listing everything the program has.
(import agent "vendor:agent")
(defstruct Boom [why i32])
(defonce label str)
(defonce grid [4 i32])
(defonce pressure i64)
(defonce untouched i64 99)
;; The inner frame. It writes two globals and then errors with nothing
;; handling the condition, so the program stops here with [main] under it.
(defn inner [] i64
(set pressure 12)
(set (at grid 0) 7)
(error (Boom {.why 3}))
0)
(defn main [] i32
(agent/start "/tmp/flan-dev-globals-fallback.sock")
(set label "running")
(set (at grid 1) 5)
(print (inner)) (println "")
(dotimes [i 4000]
(agent/wait 5))
0)