[Oberon] PO2013 - Show Heap Blocks

[Tomas Kral]

On Wed, 24 Jun 2020 08:45:09 +0100
Paul Reed <paulreed at paddedcell.com> wrote:

> 4. The already-observed corruption can be detected by walking each
> free list and doing a sanity check on the pointers (will fail with
> the data you have shown us)


I am testing this, if not too silly an idea.

  PROCEDURE GetBlock32(VAR p: LONGINT);
    VAR q: LONGINT;
  BEGIN
    IF list3 # 0 THEN p := list3; SYSTEM.GET(list3+4, q); (*mark*)
      IF q = -1 THEN SYSTEM.GET(list3+8, list3) (*next*) ELSE list3 := 0 END
    ELSE GetBlock64(q); SYSTEM.PUT(q+32, 32); SYSTEM.PUT(q+36, -1); SYSTEM.PUT(q+40, list3);
      list3 := q + 32; p := q
    END
  END GetBlock32;

Now list32 proc reports these sort of lines, only one line per call, why not more lines?

000628C0 FFFFFFFF 00000000 <== last free
0006BF60 FFFFFFFF 0006BD60 <== already used
00064BE0 FFFFFFFF 00000000 <== last free

-- 
Tomas Kral <thomas.kral at email.cz>