Joseph Ferano
a4c6b996ff
The trio the author decided on 2026-09-20 is now all built: def is CL's defparameter — its initialiser runs on every daemon re-run, unguarded, so an edited initialiser repaints the same storage on C-c C-c plus re-run — defonce (Clojure's name for CL's defvar, per the author) initialises once behind the .init~once. flag, and defconst stays the image. One parse arm reads both forms; the difference is Ast.reinit, carried to Tast.global's grerun. Emit.startup_plan gives a def no guard flag, and Check.check_global lifts every def initialiser — zero and literal included — into global/<n>, so the host's startup reaches it through the function cell and a re-evaluated def swaps it (Session's def_inits; Emit.redefinition declares the cell for a non-sibling target). The old defvar spelling is refused with the rename and both compiling spellings, and every program, test, doc and editor list is swept — except sand.flan, the author's live WIP, whose seven defvar lines are flagged in FIX.org and keep its three dependent tests red on this branch.
25 lines
1.1 KiB
Plaintext
25 lines
1.1 KiB
Plaintext
;;;; A dyn global that outlives the run that filled it.
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;;;;
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;;;; The park is not a quiet state: the daemon services evaluated thunks on
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;;;; the parked thread, a thunk allocates, and an allocation collects. So the
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;;;; question this program is built to ask is whether the roots the emitted
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;;;; main pushed for its dyn globals are still on the collector's stack after
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;;;; the run that pushed them has finished — because the park cuts that stack
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;;;; back, and cutting it back to empty took the globals with the frames.
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;;;;
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;;;; [config] is a map rather than a number on purpose: a dyn number is an
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;;;; immediate word and survives an unrooted heap by not being on it, so it
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;;;; would answer the same whether or not the root was there. What is stored
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;;;; is a heap object, and reading it back is a read of heap memory.
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;;;;
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;;;; main returns immediately: the run has nothing to do but fill the global,
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;;;; and everything this fixture is for happens after it.
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(import agent "vendor:agent")
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(defonce config dyn)
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(defn main [] i32
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(agent/start "/tmp/flan-dev-dyn-global-fallback.sock")
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(set config {:s "kept" :n 1})
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0)
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