Target specific memory attributes from RTL

[Balaji S]

Reference(s):
1. Mail: James E Wilson <[EMAIL PROTECTED]>, "Re: How to get m/c dependent 
attributes from RTL (expressions, not a variable)?", 10-Feb-2005.

2. Mail: James E Wilson <[EMAIL PROTECTED]>, "Re: How to get m/c dependent 
attributes from RTL (expressions, not a variable)?", 12-Feb-2005.

Hi all,
As suggested in references, i'm able to get the target specific attributes from 
RTL in the following cases:
1. Through SYMBOL_REF_FLAGS and if it is a SYMBOL_REF RTL (symbol_ref: ...), 
direct variable
2. Through MEM_EXPR of MEM if its operand is not a SYMBOL_REF and a REG (mem:HI 
(reg:...)), indirect variable access
3. Through REG_EXPR of REG of a MEM and memory access is a first level pointer 
reference (mem:HI (reg:...)), indirect memory access

But, i'm not able to access target specific attribute from second level of 
indirection onwards.

For example,
int **gpi ;

variable_decl of 'gpi' is available during access of 'gpi' and '*gpi' and not 
during '**gpi'.

I have looked at existing ports for similar implementation of memory attributes 
but failed to find one.

Please point me a good resource for handling memory attributes.

Thanks in advance,
Balaji Sivan