nsz Git - libfirm/blob - ir/be/scripts/generate_new_opcodes.pl

   1 #!/usr/bin/perl -w
   2
   3 # This script generates the C code which creates the irop's and
   4 # their coresponding node constructors for all operations in a given spec
   5 # so they can be used as normal firm nodes.
   6 # Creation: 2005/10/19
   7 # $Id$
   8
   9 use strict;
  10 use Data::Dumper;
  11
  12 my $specfile   = $ARGV[0];
  13 my $target_dir = $ARGV[1];
  14 my $state      = 1;
  15 my $cur_op     = "";
  16 my $line_nr    = 0;
  17
  18 our $arch;
  19 our $additional_opcodes;
  20 our %nodes;
  21 our %cpu;
  22 our $default_cmp_attr;
  23
  24 # include spec file
  25
  26 my $return;
  27
  28 no strict "subs";
  29 unless ($return = do $specfile) {
  30         warn "couldn't parse $specfile: $@" if $@;
  31         warn "couldn't do $specfile: $!"    unless defined $return;
  32         warn "couldn't run $specfile"       unless $return;
  33 }
  34 use strict "subs";
  35
  36 my $target_c = $target_dir."/gen_".$arch."_new_nodes.c.inl";
  37 my $target_h = $target_dir."/gen_".$arch."_new_nodes.h";
  38
  39 #print Dumper(%nodes);
  40 #print Dumper(%operands);
  41
  42 # create c code file from specs
  43
  44 my @obst_opvar;       # stack for the "ir_op *op_<arch>_<op-name> = NULL;" statements
  45 my @obst_get_opvar;   # stack for the get_op_<arch>_<op-name>() functions
  46 my @obst_constructor; # stack for node constructor functions
  47 my @obst_new_irop;    # stack for the new_ir_op calls
  48 my @obst_enum_op;     # stack for creating the <arch>_opcode enum
  49 my @obst_header;      # stack for function prototypes
  50 my @obst_is_archirn;  # stack for the is_$arch_irn() function
  51 my @obst_cmp_attr;    # stack for the compare attribute functions
  52 my @obst_proj;        # stack for the pn_ numbers
  53 my $orig_op;
  54 my $arity;
  55 my $cmp_attr_func;
  56 my $temp;
  57 my $n_opcodes = 0;    # number of opcodes
  58
  59 # for registering additional opcodes
  60 $n_opcodes += $additional_opcodes if (defined($additional_opcodes));
  61
  62 push(@obst_header, "void ".$arch."_create_opcodes(void);\n");
  63
  64 push(@obst_enum_op, "typedef enum _$arch\_opcodes {\n");
  65 foreach my $op (keys(%nodes)) {
  66         my %n        = %{ $nodes{"$op"} };
  67         my $known_mode;
  68         my $n_res    = 0;
  69         my $num_outs = 0;
  70         my @out_flags;
  71
  72         # determine arity from in requirements
  73         $arity = exists($n{"arity"}) ? $n{"arity"} : 0;
  74         if (exists($n{"reg_req"}) && exists($n{"reg_req"}{"in"})) {
  75                 $arity = scalar(@{ $n{"reg_req"}{"in"} });
  76         }
  77
  78         $orig_op = $op;
  79         $op      = $arch."_".$op;
  80         $temp    = "";
  81
  82         # define some proj numbers
  83         if (exists($n{"outs"})) {
  84                 undef my @outs;
  85
  86                 @outs     = @{ $n{"outs"} };
  87                 $num_outs = $#outs + 1;
  88
  89                 push(@obst_proj, "\nenum pn_$op {\n");
  90
  91                 for (my $idx = 0; $idx <= $#outs; $idx++) {
  92                         # check, if we have additional flags annotated to out
  93                         if ($outs[$idx] =~ /:(S|I(\|(S|I))*)/) {
  94                                 push(@out_flags, $1);
  95                                 $outs[$idx] =~ s/:(S|I(\|(S|I))*)//;
  96                         }
  97                         push(@obst_proj, "  pn_$op\_".$outs[$idx]." = $idx,\n");
  98                 }
  99
 100                 push(@obst_proj, "};\n");
 101                 $known_mode = "mode_T";
 102         }
 103         if (exists($n{"mode"})) {
 104                 $known_mode = $n{"mode"};
 105         }
 106
 107         push(@obst_opvar, "ir_op *op_$op = NULL;\n");
 108         push(@obst_get_opvar, "ir_op *get_op_$op(void)         { return op_$op; }\n");
 109         push(@obst_get_opvar, "int    is_$op(const ir_node *n) { return get_$arch\_irn_opcode(n) == iro_$op; }\n\n");
 110
 111         push(@obst_is_archirn, "is_$op(node)");
 112
 113         push(@obst_header, "extern ir_op *op_$op;\n");
 114         push(@obst_header, "ir_op *get_op_$op(void);\n");
 115         push(@obst_header, "int is_$op(const ir_node *n);\n");
 116
 117         $cmp_attr_func = 0;
 118         # create compare attribute function if needed
 119         if (exists($n{"cmp_attr"}) || defined($default_cmp_attr)) {
 120                 push(@obst_cmp_attr, "static int cmp_attr_$op(ir_node *a, ir_node *b) {\n");
 121                 push(@obst_cmp_attr, "\t$arch\_attr_t *attr_a = get_$arch\_attr(a);\n");
 122                 push(@obst_cmp_attr, "\t$arch\_attr_t *attr_b = get_$arch\_attr(b);\n");
 123                 push(@obst_cmp_attr, "\t(void) attr_a;\n");
 124                 push(@obst_cmp_attr, "\t(void) attr_b;\n");
 125                 if(exists($n{"cmp_attr"})) {
 126                         push(@obst_cmp_attr, "\t".$n{"cmp_attr"}."\n");
 127                 } else {
 128                         push(@obst_cmp_attr, "\t$default_cmp_attr\n");
 129                 }
 130                 push(@obst_cmp_attr, "}\n\n");
 131
 132                 $cmp_attr_func = 1;
 133         }
 134
 135         if (exists($n{"rd_constructor"}) && $n{"rd_constructor"} =~ /^NONE$/i) {
 136                 # we explicitly skip the constructor if the specification entry says NONE
 137         }
 138         else {
 139                 $n{"comment"} = "construct $op" if(!exists($n{"comment"}));
 140                 $n{"comment"} =~ s/^"|"$//g;    # remove "
 141                 $n{"comment"} = "/* ".$n{"comment"}." */\n";
 142                 push(@obst_constructor, $n{"comment"});
 143
 144                 # create constructor head
 145                 my $complete_args = "";
 146                 my $arg_names     = "";
 147                 $temp             = "";
 148
 149                 $temp = "ir_node *new_rd_$op(dbg_info *db, ir_graph *irg, ir_node *block";
 150                 if (!exists($n{"args"}) || $n{"args"} =~ /^DEFAULT$/i) { # default args
 151                         if ($arity !~ /^\d+$/) {
 152                                 print "DEFAULT args require numeric arity (0, 1, 2, ...)! Ignoring op $orig_op!\n";
 153                                 next;
 154                         }
 155                         for (my $i = 1; $i <= $arity; $i++) {
 156                                 $complete_args .= ", ir_node *op".$i;
 157                                 $arg_names     .= ", op".$i;
 158                         }
 159                         if (!defined($known_mode)) {
 160                                 $complete_args .= ", ir_mode *mode";
 161                                 $arg_names     .= ", mode";
 162                         }
 163                 }
 164                 else { # user defined args
 165                         for my $href (@{ $n{"args"} }) {
 166                                 $href->{"type"} .= " " if ($href->{"type"} !~ / [*]?$/); # put a space between name and type if there is none at the end
 167                                 $complete_args  .= ", ".$href->{"type"}.$href->{"name"};
 168                                 $arg_names      .= ", ".$href->{"name"};
 169                         }
 170                 }
 171
 172                 # we have additional attribute arguements
 173                 if (exists($n{"attr"})) {
 174                         $complete_args .= ", ".$n{"attr"};
 175                 }
 176
 177                 # $complete_args = substr($complete_args, 2);
 178                 $temp .= "$complete_args)";
 179                 push(@obst_constructor, $temp." {\n");
 180                 push(@obst_header, $n{"comment"});
 181                 push(@obst_header, $temp.";\n");
 182
 183                 # emit constructor code
 184                 if (!exists($n{"rd_constructor"}) || $n{"rd_constructor"} =~ /^DEFAULT$/i) { # default constructor
 185                         if ($arity !~ /^\d+$/) {
 186                                 print "DEFAULT rd_constructor requires numeric arity! Ignoring op $orig_op!\n";
 187                                 next;
 188                         }
 189
 190                         $temp  = "\tir_node *res;\n";
 191                         $temp .= "\tir_node *in[$arity];\n" if ($arity > 0);
 192                         $temp .= "\tint flags = 0;\n";
 193                         $temp .= "\t$arch\_attr_t *attr;\n" if (exists($n{"init_attr"}));
 194
 195                         my $exec_units = "NULL";
 196                         # set up static variables for cpu execution unit assigments
 197                         if (exists($n{"units"})) {
 198                                 $temp .= gen_execunit_list_initializer($n{"units"});
 199                                 $exec_units = "_exec_units";
 200                         }
 201
 202                         undef my $in_req_var;
 203                         undef my $out_req_var;
 204
 205                         # set up static variables for requirements and registers
 206                         if (exists($n{"reg_req"})) {
 207                                 my %req = %{ $n{"reg_req"} };
 208                                 my $idx;
 209
 210                                 undef my @in;
 211                                 @in = @{ $req{"in"} } if (exists($req{"in"}));
 212                                 undef my @out;
 213                                 @out = @{ $req{"out"} } if exists(($req{"out"}));
 214
 215                                 if (@in) {
 216                                         $in_req_var = "_in_req_$op";
 217                                         $temp .= "\tstatic const $arch\_register_req_t *".$in_req_var."[] =\n";
 218                                         $temp .= "\t{\n";
 219                                         for ($idx = 0; $idx <= $#in; $idx++) {
 220                                                 $temp .= "\t\t".$op."_reg_req_in_".$idx.",\n";
 221                                         }
 222                                         $temp .= "\t};\n";
 223                                 }
 224
 225                                 if (@out) {
 226                                         $out_req_var = "_out_req_$op";
 227
 228                                         $temp .= "\tstatic const $arch\_register_req_t *".$out_req_var."[] =\n";
 229                                         $temp .= "\t{\n";
 230                                         for ($idx = 0; $idx <= $#out; $idx++) {
 231                                                 $temp .= "\t\t".$op."_reg_req_out_".$idx.",\n";
 232                                         }
 233                                         $temp .= "\t};\n";
 234                                 }
 235                         }
 236
 237                         $temp .= "\n";
 238                         $temp .= "\tif (!op_$op) {\n";
 239                         $temp .= "\t\tassert(0);\n";
 240                         $temp .= "\t\treturn NULL;\n";
 241                         $temp .= "\t}\n\n";
 242                         for (my $i = 1; $i <= $arity; $i++) {
 243                                 $temp .= "\tin[".($i - 1)."] = op".$i.";\n";
 244                         }
 245
 246                         # set flags
 247                         if (exists($n{"irn_flags"})) {
 248                                 foreach my $flag (split(/\|/, $n{"irn_flags"})) {
 249                                         if ($flag eq "R") {
 250                                                 $temp .= "\tflags |= arch_irn_flags_rematerializable;   /* op can be easily recalculated */\n";
 251                                         }
 252                                         elsif ($flag eq "N") {
 253                                                 $temp .= "\tflags |= arch_irn_flags_dont_spill;         /* op is NOT spillable */\n";
 254                                         }
 255                                         elsif ($flag eq "I") {
 256                                                 $temp .= "\tflags |= arch_irn_flags_ignore;             /* ignore op for register allocation */\n";
 257                                         }
 258                                         elsif ($flag eq "S") {
 259                                                 $temp .= "\tflags |= arch_irn_flags_modify_sp;          /* op modifies stack pointer */\n";
 260                                         }
 261                                 }
 262                         }
 263
 264                         my $in_param;
 265                         my $out_param;
 266                         # allocate memory and set pointer to register requirements
 267                         if (exists($n{"reg_req"})) {
 268                                 my %req = %{ $n{"reg_req"} };
 269
 270                                 undef my @in;
 271                                 @in = @{ $req{"in"} } if (exists($req{"in"}));
 272                                 undef my @out;
 273                                 @out = @{ $req{"out"} } if exists(($req{"out"}));
 274
 275                                 if (@in) {
 276                                         $in_param = $in_req_var;
 277                                 }
 278                                 else {
 279                                         $in_param = "NULL";
 280                                 }
 281
 282                                 if (@out) {
 283                                         $n_res     = $#out + 1;
 284                                         $out_param = "$out_req_var, $exec_units, $n_res";
 285                                 }
 286                                 else {
 287                                         $out_param = "NULL, $exec_units, 0";
 288                                 }
 289                         }
 290                         else {
 291                                 $in_param  = "NULL";
 292                                 $out_param = "NULL, $exec_units, 0";
 293                         }
 294                         $temp .= "\n\t/* create node */\n";
 295
 296                         my $latency = 1;
 297                         if (exists($n{"latency"})) {
 298                                 $latency = $n{"latency"};
 299                         }
 300
 301                         my $mode = "mode";
 302                         if (defined($known_mode)) {
 303                                 $mode = $known_mode;
 304                         }
 305                         $temp .= "\tres = new_ir_node(db, irg, block, op_$op, $mode, $arity, ".($arity > 0 ? "in" : "NULL").");\n";
 306
 307                         $temp .= "\n\t/* init node attributes */\n";
 308                         $temp .= "\tinit_$arch\_attributes(res, flags, $in_param, $out_param, $latency);\n";
 309
 310                         # set flags for outs
 311                         if ($#out_flags >= 0) {
 312                                 $temp .= "\n\t/* set flags for outs */\n";
 313                                 for (my $idx = 0; $idx <= $#out_flags; $idx++) {
 314                                         my $flags  = "";
 315                                         my $prefix = "";
 316
 317                                         foreach my $flag (split(/\|/, $out_flags[$idx])) {
 318                                                 if ($flag eq "I") {
 319                                                         $flags .= $prefix."arch_irn_flags_ignore";
 320                                                         $prefix = " | ";
 321                                                 }
 322                                                 elsif ($flag eq "S") {
 323                                                         $flags .= $prefix."arch_irn_flags_modify_sp";
 324                                                         $prefix = " | ";
 325                                                 }
 326                                         }
 327
 328                                         $temp .= "\tset_$arch\_out_flags(res, $flags, $idx);\n";
 329                                 }
 330                         }
 331
 332
 333                         if (exists($n{"init_attr"})) {
 334                                 $temp .= "\tattr = get_$arch\_attr(res);\n";
 335                                 $temp .= $n{"init_attr"}."\n";
 336                         }
 337
 338                         $temp .= "\n\t/* optimize node */\n";
 339                         $temp .= "\tres = optimize_node(res);\n";
 340                         $temp .= "\tirn_vrfy_irg(res, irg);\n\n";
 341
 342                         $temp .= "\n\treturn res;\n";
 343
 344                         push(@obst_constructor, $temp);
 345                 }
 346                 else { # user defined constructor
 347                         push(@obst_constructor, $n{"rd_constructor"});
 348                 }
 349
 350                 # close constructor function
 351                 push(@obst_constructor, "}\n\n");
 352         } # constructor creation
 353
 354         # set default values for state and flags if not given
 355         $n{"state"}    = "floats" if (! exists($n{"state"}));
 356         $n{"op_flags"} = "N"      if (! exists($n{"op_flags"}));
 357
 358
 359         push(@obst_new_irop, "\n\tmemset(&ops, 0, sizeof(ops));\n");
 360         push(@obst_new_irop, "\tops.dump_node     = $arch\_dump_node;\n");
 361
 362         if ($cmp_attr_func) {
 363                 push(@obst_new_irop, "\tops.node_cmp_attr = cmp_attr_$op;\n");
 364         }
 365
 366         $n_opcodes++;
 367         $temp  = "\top_$op = new_ir_op(cur_opcode + iro_$op, \"$op\", op_pin_state_".$n{"state"}.", ".$n{"op_flags"};
 368         $temp .= "|M, ".translate_arity($arity).", 0, sizeof($arch\_attr_t) + $n_res * sizeof(arch_register_t *), &ops);\n";
 369         push(@obst_new_irop, $temp);
 370         push(@obst_new_irop, "\tset_op_tag(op_$op, &$arch\_op_tag);\n");
 371         push(@obst_enum_op, "\tiro_$op,\n");
 372
 373         push(@obst_header, "\n");
 374 }
 375 push(@obst_enum_op, "\tiro_$arch\_last_generated,\n");
 376 push(@obst_enum_op, "\tiro_$arch\_last = iro_$arch\_last_generated");
 377 push(@obst_enum_op, " + $additional_opcodes") if (defined($additional_opcodes));
 378 push(@obst_enum_op, "\n} $arch\_opcodes;\n\n");
 379
 380 # emit the code
 381
 382 open(OUT, ">$target_c") || die("Could not open $target_c, reason: $!\n");
 383
 384 print OUT "#include \"gen_$arch\_regalloc_if_t.h\"\n\n";
 385 print OUT @obst_cmp_attr;
 386 print OUT "\n";
 387 print OUT @obst_opvar;
 388 print OUT "\n";
 389 print OUT @obst_get_opvar;
 390 print OUT "\n";
 391
 392 print OUT<<EOF;
 393
 394 static int $arch\_opcode_start = -1;
 395 static int $arch\_opcode_end   = -1;
 396
 397 EOF
 398
 399 # build the FOURCC arguments from $arch
 400
 401 my ($a, $b, $c, $d) = ('\0', '\0', '\0', '\0');
 402
 403 if (length($arch) >= 1) {
 404         $a = uc(substr($arch, 0, 1));
 405 }
 406
 407 if (length($arch) >= 2) {
 408         $b = uc(substr($arch, 1, 1));
 409 }
 410
 411 if (length($arch) >= 3) {
 412         $c = uc(substr($arch, 2, 1));
 413 }
 414
 415 if (length($arch) >= 4) {
 416         $d = uc(substr($arch, 3, 1));
 417 }
 418
 419 print OUT "static unsigned $arch\_op_tag = FOURCC('$a', '$b', '$c', '$d');\n";
 420
 421 print OUT<<ENDOFISIRN;
 422
 423 /** Return the opcode number of the first $arch opcode. */
 424 int get_$arch\_opcode_first(void) {
 425         return $arch\_opcode_start;
 426 }
 427
 428 /** Return the opcode number of the last $arch opcode + 1. */
 429 int get_$arch\_opcode_last(void) {
 430         return $arch\_opcode_end;
 431 }
 432
 433 /** Return 1 if the given node is a $arch machine node, 0 otherwise */
 434 int is_$arch\_irn(const ir_node *node) {
 435         return get_op_tag(get_irn_op(node)) == &$arch\_op_tag;
 436 }
 437
 438 int get_$arch\_irn_opcode(const ir_node *node) {
 439         if (is_$arch\_irn(node))
 440                 return get_irn_opcode(node) - $arch\_opcode_start;
 441         return -1;
 442 }
 443
 444 ENDOFISIRN
 445
 446 print OUT @obst_constructor;
 447
 448 print OUT<<ENDOFMAIN;
 449 /**
 450  * Creates the $arch specific Firm machine operations
 451  * needed for the assembler irgs.
 452  */
 453 void $arch\_create_opcodes(void) {
 454 #define N   irop_flag_none
 455 #define L   irop_flag_labeled
 456 #define C   irop_flag_commutative
 457 #define X   irop_flag_cfopcode
 458 #define I   irop_flag_ip_cfopcode
 459 #define F   irop_flag_fragile
 460 #define Y   irop_flag_forking
 461 #define H   irop_flag_highlevel
 462 #define c   irop_flag_constlike
 463 #define K   irop_flag_keep
 464 #define M   irop_flag_machine
 465 #define O   irop_flag_machine_op
 466 #define R   (irop_flag_user << 0)
 467
 468         ir_op_ops ops;
 469         int cur_opcode = get_next_ir_opcodes(iro_$arch\_last);
 470
 471         $arch\_opcode_start = cur_opcode;
 472 ENDOFMAIN
 473
 474 print OUT @obst_new_irop;
 475 print OUT "\n";
 476 print OUT "\t$arch\_register_additional_opcodes(cur_opcode);\n" if (defined($additional_opcodes));
 477 print OUT "\t$arch\_opcode_end = cur_opcode + iro_$arch\_last";
 478 print OUT " + $additional_opcodes" if (defined($additional_opcodes));
 479 print OUT ";\n";
 480 print OUT "}\n";
 481
 482 close(OUT);
 483
 484 open(OUT, ">$target_h") || die("Could not open $target_h, reason: $!\n");
 485
 486 print OUT "#ifndef __GEN_$arch\_NEW_NODES_H__\n";
 487 print OUT "#define __GEN_$arch\_NEW_NODES_H__\n\n";
 488 print OUT @obst_enum_op;
 489 print OUT "int is_$arch\_irn(const ir_node *node);\n\n";
 490 print OUT "int get_$arch\_opcode_first(void);\n";
 491 print OUT "int get_$arch\_opcode_last(void);\n";
 492 print OUT "int get_$arch\_irn_opcode(const ir_node *node);\n";
 493 print OUT @obst_header;
 494 print OUT @obst_proj;
 495 print OUT "\n#endif /* __GEN_$arch\_NEW_NODES_H__ */\n";
 496
 497 close(OUT);
 498
 499 ###
 500 # Translates numeric arity into string constant.
 501 ###
 502 sub translate_arity {
 503         my $arity = shift;
 504
 505         if ($arity =~ /^\d+$/) {
 506                 if    ($arity == 0) {
 507                         return "oparity_zero";
 508                 }
 509                 elsif ($arity == 1) {
 510                         return "oparity_unary";
 511                 }
 512                 elsif ($arity == 2) {
 513                         return "oparity_binary";
 514                 }
 515                 elsif ($arity == 3) {
 516                         return "oparity_trinary";
 517                 }
 518                 else {
 519                         return "oparity_any";
 520                 }
 521         }
 522         else {
 523                 return "oparity_".$arity;
 524         }
 525 }
 526
 527 ###
 528 # Return the list of pointers for the given execution units.
 529 ###
 530 sub gen_execunit_list_initializer {
 531         my $units   = shift;
 532         my $uc_arch = uc($arch);
 533         my $ret     = "";
 534         my $ret2    = "";
 535         my %init;
 536
 537         foreach my $unit (@{ $units }) {
 538                 if ($unit eq "DUMMY") {
 539                         push(@{ $init{"DUMMY"} }, "\t\t&be_machine_execution_units_DUMMY[0]");
 540                 }
 541                 elsif (exists($cpu{"$unit"})) {
 542                         # operation can be executed on all units of this type
 543                         # -> add them all
 544                         my $tp_name = "$arch\_execution_units_$unit";
 545                         my $idx     = 0;
 546                         foreach (@{ $cpu{"$unit"} }) {
 547                                 next if ($idx++ == 0);  # skip first element (it's not a unit)
 548                                 my $unit_name = "$uc_arch\_EXECUNIT_TP_$unit\_$_";
 549                                 push(@{ $init{"$unit"} }, "\t\t&".$tp_name."[".$unit_name."]");
 550                         }
 551                 }
 552                 else {
 553                         # operation can be executed only a certain unit
 554                         # -> find corresponding unit type
 555                         my $found = 0;
 556 TP_SEARCH:      foreach my $cur_type (keys(%cpu)) {
 557                                 foreach my $cur_unit (@{ $cpu{"$cur_type"} }) {
 558                                         if ($unit eq $cur_unit) {
 559                                                 my $tp_name   = "$arch\_execution_units_$cur_type";
 560                                                 my $unit_name = "$uc_arch\_EXECUNIT_TP_$cur_type\_$unit";
 561                                                 push(@{ $init{"$unit"} }, "\t\t&".$tp_name."[".$unit_name."]");
 562                                                 $found = 1;
 563                                                 last TP_SEARCH;
 564                                         }
 565                                 }
 566                         }
 567
 568                         if (! $found) {
 569                                 print STDERR "Invalid execution unit $unit specified!\n";
 570                         }
 571                 }
 572         }
 573
 574         # prepare the 2-dim array init
 575         foreach my $key (keys(%init)) {
 576                 $ret .= "\tstatic const be_execution_unit_t *_allowed_units_".$key."[] =\n";
 577                 $ret .= "\t{\n";
 578                 foreach (@{ $init{"$key"} }) {
 579                         $ret .= "$_,\n";
 580                 }
 581                 $ret .= "\t\tNULL\n";
 582                 $ret .= "\t};\n";
 583                 $ret2 .= "\t\t_allowed_units_$key,\n";
 584         }
 585         $ret2 .= "\t\tNULL\n";
 586
 587         $ret .= "\tstatic const be_execution_unit_t **_exec_units[] =\n";
 588         $ret .= "\t{\n";
 589         $ret .= $ret2;
 590         $ret .= "\t};\n";
 591
 592         return $ret;
 593 }