31 lines
1.2 KiB
Plaintext
31 lines
1.2 KiB
Plaintext
;;;; The program the source-level debugging case runs under lldb.
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;;;;
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;;;; Every field holds a distinct known value of a distinct shape, so a DWARF
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;;;; member offset that is wrong prints something obviously wrong rather than
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;;;; something plausible — which is the failure mode this whole case exists
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;;;; for. debug-permuted.flan is the same program with the fields declared in
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;;;; a different order and every value unchanged: the two must print the same
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;;;; field/value pairs from different offsets.
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;;;;
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;;;; alive at 0 (a byte), 7 of padding, heat at 8, id at 16, 4 of padding,
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;;;; name at 24 — the slice is the member that moves if the alignment rule is
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;;;; wrong, because it is the only one whose own alignment exceeds its first
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;;;; member's size.
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(defstruct Cell [alive bool heat f64 id i32 name str])
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(defn tick [c (Ptr Cell) n i32] i32
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(let [bump (+ n 1)]
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(set (.heat c) (+ (.heat c) 1.5))
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(set (.id c) bump)
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bump))
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(defn main [] i32
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(let [c (Cell {.alive true .heat 3.25 .id 7 .name "grain"})]
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(let [r (tick (addr c) 41)]
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(print r) (println "")
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(print (.heat c)) (println "")
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(print (.id c)) (println "")
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(print (.name c)) (println "")
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0)))
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