[Bug python/25936] New: Sizeof value for arrays reported wrongly as zero

["andre.poenitz at qt dot io" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25936

            Bug ID: 25936
           Summary: Sizeof value for arrays reported wrongly as zero
           Product: gdb
           Version: 9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: andre.poenitz at qt dot io
  Target Milestone: ---

In the code below, the array data member reported to have a size zero.

The behavior depends on the actual types in the array, std::fstream and
std::strings are only examples, possibly it works for types that are completely
inlined.



#include <fstream>
#include <string>

struct S
{
    std::fstream items[5];  // Does not work. Same for QObject, ...
    // std::string items[5];  // Works. Same for int, ...
};

int main()
{
    S s;

    // Break here.
    // py print(gdb.parse_and_eval('s').type.sizeof) yields 2640       // Good
    // py print(gdb.parse_and_eval('s.items').type.sizeof)  yields 0   // Bad
    // py print(gdb.parse_and_eval('s').type.fields()[0].type.sizeof)  yields 0
// Bad
    return s.items[0].is_open();
//    return int(s.items[0].size());
}

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