[Bug default/31593] New: field labels are not acknowledged in struct constructors

[jose.marchesi at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31593

            Bug ID: 31593
           Summary: field labels are not acknowledged in struct
                    constructors
           Product: poke
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: unassigned at sourceware dot org
          Reporter: jose.marchesi at oracle dot com
                CC: poke-devel at gnu dot org
  Target Milestone: ---

At this point struct constructors work this way:

  1. An empty struct is created.
  2. Fields are created for the new struct
     2.1. if a value is provided for the field, use it
          and check integrity.  This takes into account
          optional fields.
     2.2. otherwise, construct the field.
  3. Return the new struct.

In order to take field labels into account, the process should be changed to
something like:

  1. An empty struct is created.
  2. Fields are created for the new struct
     2.1. if a value is provided for the field, use it
     2.2. otherwise, construct the field
  3. Open a temporary mem IO space
  4. Write the resulting struct using the type's writer into the
     temporary IO space.
  5. Map back the struct.  This may raise E_constraint
  6. Return the resulting struct

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