Re: [sdcc-devel] AST level & block explanation

[Philipp K. K. <pk...@sp...>]

Am 26.10.2017 um 23:52 schrieb Åke Rehnman:
> Hello All!
> 
> If some kind soul could donate some time to explain. Looking at
> generated AST i wonder what levels and blocks are. Specifically why "ni"
> symbol has L2 B3 in (block???) L2 B4 ?
> 
> /Ake

Looking at function_declarator2 in src/SDCC.y it seems, function
parameters go into an extra block? However, I do not know why for your
int dummy(int x)
{
   int n = 0;
   {
   int ni = 10;
   for (;x>=0;x--)
     ni = ni - 2;
   }
   return n;
}

x is in some "hidden" block B3 (by number "in between" the two blocks
B2, B4 for the function body), while for

int dummy2(int j)
{
  for(int i = 0; i  < 3; i++)
    {
      j--;
    }
  return(j);
}

j is in some "hidden" block B1 (by number "above" the two blocks B2, B3
for the function body);

Philipp