Microsoft KB Archive/148608

= BUG: Derived-Type with Pointer Expands Incorrectly in Debugger =

PSS ID Number: 148608

Article Last Modified on 11/3/1999

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The information in this article applies to:


 * Microsoft Fortran PowerStation for Windows 95 and Windows NT 4.0

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This article was previously published under Q148608



SYMPTOMS
When you debug a derived-type variable that contains a pointer to another derived-type object and you try to view the members of the pointed to object in a watch window, it fails. This causes the pointer to member structure to be incorrectly expanded out.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.



Steps to Reproduce Problem
Build the following sample code in Developer Studio with the /Zi compiler option, and then perform the following steps:


 * 1) Begin a debugging session; On the Developer Studio Debug menu, click Build, and then click Step Into.
 * 2) Step through the main program beyond the allocate statement.
 * 3) In a watch window, type the variable name root, and press the ENTER key.
 * 4) View the members of root. Click each of the (+) nesting symbols to expand each level of the derived-type object root.

Expanding root yields root%B%L%B%L%B%L instead of the correct pointer to member structure of root%B%l%i. Typing in the correct pointer to member structure in a watch window yields the following message in the corresponding value column:

Invalid structure member

Sample Code
C Compile options needed: /Zi

module types type t_leaf integer i       end type t_leaf

type t_branch type (t_leaf), pointer :: l       end type

type t_root type (t_branch) b       end type end module types

program main use types implicit none

type (t_root) root allocate( root%b%l )

root%b%l%i = 5 end program main

Additional query words: 4.00

Keywords: kbLangFortran KB148608

Technology: kbAudDeveloper kbFORTRANPower400NT kbFortranSearch kbZNotKeyword8

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