mutable deftype fields: (set! field val) in a method

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deftype fields tagged ^:unsynchronized-mutable / ^:volatile-mutable can now be
reassigned in place from a method, as on the JVM. A jrec stores fields as cons
cells, so a new jolt-set-field! mutates the pair with set-cdr!. The deftype macro
rewrites (set! mutable-field v) in a method body to (set! (.-field inst) v), and
the analyzer compiles a (set! (.-field obj) v) target to jolt-set-field! — so
both the rewritten symbol form and an explicit interop (set! (.-root this) v) go
through one path. Field reads remain a snapshot at method entry, which is correct
for the universal read-then-set pattern (a repeated set! of the same field in one
call would read the entry value).

Closes the set!-of-local SCI failures: SCI load 202 -> 205/218.

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This commit is contained in:

Yogthos 2026-06-22 01:19:03 -04:00

parent b9ab750983

commit 424ce75cf6

9 changed files with 416 additions and 371 deletions

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