Re: [PATCH][C++] Fix PR29433, make C++ use a lot less time/memory

[Daniel Jacobowitz <drow at false dot org>]

On Mon, Dec 11, 2006 at 05:03:18PM +0100, Michael Matz wrote:
> Hi,
> 
> On Mon, 11 Dec 2006, Daniel Jacobowitz wrote:
> 
> > On Mon, Dec 11, 2006 at 04:50:41PM +0100, Richard Guenther wrote:
> > > With using mangled names (which would lead to so much smaller debug info)
> > > we'd have to fix gdb of course.  But maybe stage1 of gcc 4.3 is a good
> > > amount ahead of time to let gdb folks sort this out themselves...
> > 
> > Maybe if someone could write up a coherent explanation of what you want
> > to change...
> 
> The change in debug info would be that DW_AT_name would not necessarily 
> contain a nice user printable name anymore (which right now is generated 
> by gcc via the diagnostic machinery) but would sometimes contain a mangled 
> name (i.e. recognizable by being prefixed with "_Z").  If gdb could handle 
> that (i.e. before showing any name try to demangle it and see if that 
> worked) all would be well.  DW_AT_linkage_name would not be touched by 
> that.
> 
> There will be differences between the current user friendly name and the 
> demangled version (for instance some scopes are left out in the current 
> variant), but IMHO that's more consistent.

No way, please don't do this.  DW_AT_name is supposed to be the type
name from the source language.

14 Identifier Names

Any debugging information entry representing a program entity that has
been given a name may have a DW_AT_name attribute, whose value is a
string representing the name as it appears in the source program.

-- 
Daniel Jacobowitz
CodeSourcery