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Proof step 18 from proof prepost-read-log (previous step)

# buf = EB_PAGE_SIZE, LEB_SIZE = n1 + logoff0, avol[m5] = mapped(buf1), buf0 = buf, m = logoff0, m0 = m5, n = EB_PAGE_SIZE, n0 = 0, logoff0 < LEB_SIZE, m5 < # avol, ebm-vol-inv(avol), is-aligned(logoff0, EB_PAGE_SIZE), is-encoded(log, subarray(buf1, 0, logoff0)), is-encoded(log0, buf1), logoff0 ≤ # buf1 ⊦ ⟪if m0 < # avol ∧ avol[m0].mapped? ∧ n0 + n ≤ # buf0 ∧ m + n ≤ LEB_SIZE then {fail_or_success#(; ; err); if err = ESUCCESS then buf0 := copy(avol[m0].data + mkempbuf(LEB_SIZE - # avol[m0].data), m, buf0, n0, n) else choose buf with # buf = # buf0 ∧ range=(buf0, 0, buf, 0, n0) ∧ range=(buf0, n0 + n, buf, n0 + n, # buf0 - n0 + n) in buf0 := buf} else abort; m0 := EB_PAGE_SIZE; buf := buf0; if err = ESUCCESS then if buf = mkempbuf(# buf) then err := ENOENT else let rnd = ? in {decode_ref_node#(m0, buf; rnd; err); if err = ESUCCESS then log := log + rnd.leb '}; logoff := logoff0 + m0⟫ ( logoff ≤ LEB_SIZE ∧ # buf = m0 ∧ is-aligned(logoff, # buf) ∧ (err = ESUCCESS ∨ err = ENOENT ∨ ⌊err⌋ ) ∧ avol[m5].mapped? ∧ (err = ESUCCESS → logoff ≤ # avol[m5].data ∧ is-encoded(log, subarray(avol[m5].data, 0, logoff))) ∧ (err = ENOENT → is-encoded(log, avol[m5].data)) ∧ LEB_SIZE < n1 + logoff), n1 = 0

Heuristic conditional right split applied rule if right

And obtained the following new goals

Rule argument

pos: right 1

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