Hi, I wrote the following piece of code : 
open(VHD,"$vhd_file") || die "Can't open $vhd_file $!\n";
while(<VHD>){

  # find all the entities in the current file
  if (/entity\s+(\w+)\s+is/i) {
    $1{'name'} = $1;
    $1{'fname'} = $vhd_file;
    push @entities, \%1;
  }
 if (/architecture (\w+) of (\w+) is/i ... /end $1\;/i) {
    # we are in the architecture of the entity.
    my $arch_entity = $2;
    # match  instance_name : entity
    if (/^\s*(\w+)\s*:\s*(\w+)$/) {
      print STDOUT "$1\t$2\t$arch_entity\n";
      # find the entity and add the deps to it
      foreach my $ent (@entities) {
        if ($$ent{'name'} eq $arch_entity) {
          $$ent{'deps'}{$2}++;
        }
      }
    }
  }
}
close VHD;
}
foreach my $ent (@entities) {
  print "$$ent{'fname'}\t$$ent{'name'}\n";
  foreach my $dep (keys %{ $$ent{'deps'} } ) { 
    print "DEP: $dep $$ent{'deps'}{$dep} ";
    print "\n";
  }
}

[download]
However when I run the script only the last entity is printed from the last foreach loop. The problem seems to be that the %1 hash is overwritten by each successive match or something like that. I'm not sure. I thought what I did was ok output : 
/proj/dice/external/adelante/24July2002/PowerBteFPGA/PBTE_FPGA/ref/coo
+lrisc/status_816.vhd      status_816
DEP: latchs_reg 34 
DEP: pc_stack_816 11 
DEP: latchr 367 
DEP: latchr_reg 426 
DEP: cr816lu 10 
/proj/dice/external/adelante/24July2002/PowerBteFPGA/PBTE_FPGA/ref/coo
+lrisc/status_816.vhd      status_816
DEP: latchs_reg 34 
DEP: pc_stack_816 11 
DEP: latchr 367 
DEP: latchr_reg 426 
DEP: cr816lu 10 
etc....

[download]

In reply to refs and hashes by diarmuid

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