Python: gdb.Type.template_argument method issue

Python: gdb.Type.template_argument method issue

[Paul_Koning]

The template_argument method assumes that all template arguments are types.  While that's the most common, other things are also found in the wild.  My C++ book says that the arguments can be integers, enums, pointers, references, or pointer-to-member constant values.  (GCC doesn't want to accept pointers and references, perhaps because it thinks they are relocatable.)

Looking at the code, it appears that the template_argument method will be looking at the demangled type string.  It seems that that's insufficient to sort out exactly what a given template argument is.  For example, if it's an enum, the method will simply see the enum value name, but I don't see how it would know which enum type that is so that doesn't allow it to nail down exactly what we have.

I figure that the thing to do would be to have the method return either a gdb.Type or a gdb.Value, depending on what the template argument is.  But it looks like it needs more detailed knowledge about the template arguments than it has in the current logic, and I don't know enough GDB to know where to look for that. 

Any hints on where to look?

                paul

Re: Python: gdb.Type.template_argument method issue

[Phil Muldoon]

<Paul_Koning@Dell.com> writes:

> The template_argument method assumes that all template arguments are types.  While that's the most common, other things are also found in the wild.  My C++ book says that the arguments can be integers, enums, pointers, references, or pointer-to-member constant values.  (GCC doesn't want to accept pointers and references, perhaps because it thinks they are relocatable.)

http://sourceware.org/bugzilla/show_bug.cgi?id=11060

> Any hints on where to look?

If that is the issue you are encountering, it looks like it has been
fixed in GDB, but you need a newer GCC to take advantage of it.

Cheers

Phil

RE: Python: gdb.Type.template_argument method issue

[Paul_Koning]

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>> The template_argument method assumes that all template arguments are 
>> types.  ...
>
>http://sourceware.org/bugzilla/show_bug.cgi?id=11060
>
>If that is the issue you are encountering, it looks like it has been fixed in GDB, but you need a newer GCC to take advantage of it.

Yes, that's it.  Thanks, so all I have to do is update to the latest.

	paul
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