[Bug gdb/26050] New: GDB prints types that are unusable as inputs

[Bug gdb/26050] New: GDB prints types that are unusable as inputs

[douglasyung.llvm at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26050

            Bug ID: 26050
           Summary: GDB prints types that are unusable as inputs
           Product: gdb
           Version: 9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: douglasyung.llvm at gmail dot com
  Target Milestone: ---

I initially filed a related bug with clang, but it was pointed out that the
behavior shown was probably also a bug in gdb. Thanks to David Blaikie for the
following information.

Consider the following code:

template <class T>
struct t1 {
  void f1() { }
  ~t1() { }
};

typedef t1<t1<int>> t2;

int main() {
  t2 v1;
  v1.f1();
}

Some commands that do 'interesting' things with the no-space '>>' debug info:

(gdb) print t2::~t1
There is no field named ~t1 // this is buggy - works fine for f1 below, works
with
                            //GCC's '> >' debug info
(gdb) print t2::f1 
$1 = {void (t1<t1<int>> * const)} 0x401180 <t1<t1<int> >::f1()>

But also some quirks around this parsing in general, that happen with GCC or
Clang's debug info:

(gdb) ptype t1<t1<int> >
type = struct t1<t1<int>> [with T = t1<int>] {
  public:
    void f1(void);
    ~t1(void);
}
(gdb) ptype t1<t1<int>>
No symbol "t1<int>" in current context.

So GDB prints out a name ("t1<t1<int>>") you can't use as input to that ptype
command... - that's /probably/ not what the GDB developers intended/wanted to
happen here.

If it helps, the related clang but is
https://bugs.llvm.org/show_bug.cgi?id=46052.

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[Bug gdb/26050] GDB prints types that are unusable as inputs

[dblaikie at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26050

David Blaikie <dblaikie at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dblaikie at gmail dot com

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