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flat assembler > Compiler Internals > Unhandled exception at 0x004028CB in fasmg.exe: 0xC0000005

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zhak



Joined: 12 Apr 2005
Posts: 489
Location: Belarus
The below code causes Unhandled exception at 0x004028CB in fasmg.exe: 0xC0000005: Access violation reading location 0x002DA7FD.

The problem is in calling store from store
Code:
true  := 1
false := 0

struct MY
  a rw 1
end struct

_my MY a: 'a'

macro struct? name

  struc rb? n
    label .
    rb n
    .__length = $ - .
    .__size = 1
  end struc

  struc rw? n
    label .
    rw n
    .__length = $ - .
    .__size = 2
  end struc

  macro store name, value, i
    virtual at 0
      dbx .name.__length: value
      len = $ - i * .name.__size
    end virtual
    store value:len at .name + i * .name.__size
  end macro

  macro end?.struct?!
      end namespace
      irp def, args
        local param, value, i, len, is_seq
        value equ
        i = 0
        len = 0
        is_seq = false
        match name:value, def
          store name, value, i
        end match
      end irp
    end struc
    virtual at 0
      name name
      sizeof.name = $
    end virtual
    purge end?.struct?
  end macro

    struc name args&
      label .:sizeof.name
      namespace .
end macro
    
Post 11 Feb 2017, 01:03
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6901
Location: Kraków, Poland
Thank you for the report, it is fixed now.

You have an infinite recursion there and it helped uncover a rarely occurring bug. To avoid the recursion you should either define the STORE macro as case-insensitive symbol ("macro store?") or call the original store macro with "store?" identifier to choose the original case-insensitive over the case-sensitive one.
Post 11 Feb 2017, 12:52
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