Thank you richard for the inputs .
~Umesh
On Wed, Mar 4, 2015 at 3:29 AM, Richard Sandiford
<rdsandif...@googlemail.com> wrote:
> Umesh Kalappa <umesh.kalap...@gmail.com> writes:
>> Hi All,
>>
>> I'm trying to fetch the string constant from the constant pool entry
>> for the symbol_ref rtx like
>>
>> c sample
>>
>> int i;
>> int main()
>> {
>> printf("%d",i);
>> }
>>
>> rtl is
>>
>> (gdb) p debug_rtx(val)
>> (symbol_ref/f:SI ("*.LC0") [flags 0x2] <var_decl 0xb7c293f4 *.LC0>)
>
> The SYMBOL_REF_DECL is a VAR_DECL whose DECL_INITIAL is the constant. So:
>
>> corresponding asm
>>
>> .section .rodata,code
>> .align 2
>> .LC0:
>> .ascii "%d\000"
>>
>>
>> sample code to fetch the string "%d"
>>
>> tree sym = SYMBOL_REF_DECL(rtx);
>>
>> if (!(sym && (TREE_CODE(sym)==STRING_CST) && STRING_CST_CHECK(sym)))
>> sym = 0;
>
> ...I think you want:
>
> if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
> {
> tree str = DECL_INITIAL (SYMBOL_REF_DECL (symbol));
> if (TREE_CODE (str) == STRING_CST)
> ...
> }
>
> (STRING_CST_CHECK is really local to the tree.h macros, it shouldn't
> be used elsewhere.)
>
> Thanks,
> Richard
