Re: [PATCH] C++ Dwarf2 inner scope PR/789

[Jim Blandy <jimb@redhat.com>]

Could you provide a test case for this?

David Edelsohn <dje@watson.ibm.com> writes:

> 	While debugging a C++ application compiled with g++-3.2 and Dwarf2
> debugging information, we discovered that some functions would not have
> any symbols available.  This problem occurs when a method is defined
> inside a class-local function and prevents any symbols from appearing.
> 
> 	We traced this back to gdb/dwarf2read.c:read_func_scope().  That
> function is called recursively for the inner scope, but it currently is
> written to always pop back to file scope instead of the previous scope.
> The appended patch saves the current scope in a local variable on the
> stack and restores that scope after parsing the inner scope.  This allows
> global symbols to be seen, but we still have not been able to fix the
> innermost scope problem.
> 
> Thanks, David
> 
> 
> --- dwarf2read.c.orig	Sun Oct  6 15:00:32 2002
> +++ dwarf2read.c	Sun Oct  6 14:05:39 2002
> @@ -1663,6 +1663,7 @@ read_func_scope (struct die_info *die, s
>    struct die_info *child_die;
>    struct attribute *attr;
>    char *name;
> +  struct pending **prev_list_in_scope;
>  
>    name = dwarf2_linkage_name (die);
>  
> @@ -1704,6 +1705,7 @@ read_func_scope (struct die_info *die, s
>  
>    new = push_context (0, lowpc);
>    new->name = new_symbol (die, die->type, objfile, cu_header);
> +  prev_list_in_scope = list_in_scope;
>    list_in_scope = &local_symbols;
>  
>    if (die->has_children)
> @@ -1720,7 +1722,10 @@ read_func_scope (struct die_info *die, s
>    /* Make a block for the local symbols within.  */
>    finish_block (new->name, &local_symbols, new->old_blocks,
>  		lowpc, highpc, objfile);
> -  list_in_scope = &file_symbols;
> +  
> +  local_symbols = new->locals;
> +  param_symbols = new->params;
> +  list_in_scope = prev_list_in_scope;
>  }
>  
>  /* Process all the DIES contained within a lexical block scope.  Start