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

   1 #!/usr/bin/perl -w
   2
   3 # This script generates C code which emits assembler code for the
   4 # assembler ir nodes. It takes a "emit" key from the node specification
   5 # and substitutes lines starting with . with a corresponding fprintf().
   6 # Creation: 2005/11/14
   7 # $Id$
   8
   9 use strict;
  10 use Data::Dumper;
  11
  12 my $specfile   = $ARGV[0];
  13 my $target_dir = $ARGV[1];
  14
  15 our $arch;
  16 our %reg_classes;
  17 our %nodes;
  18
  19 # include spec file
  20
  21 my $return;
  22
  23 no strict "subs";
  24 unless ($return = do $specfile) {
  25         warn "couldn't parse $specfile: $@" if $@;
  26         warn "couldn't do $specfile: $!"    unless defined $return;
  27         warn "couldn't run $specfile"       unless $return;
  28 }
  29 use strict "subs";
  30
  31 my $target_c   = $target_dir."/gen_".$arch."_regalloc_if.c";
  32 my $target_h   = $target_dir."/gen_".$arch."_regalloc_if.h";
  33 my $target_h_t = $target_dir."/gen_".$arch."_regalloc_if_t.h";
  34
  35 # helper function
  36 sub translate_reg_type {
  37         my $t = shift;
  38
  39         if ($t == 0) {
  40                 return "arch_register_type_none";
  41         }
  42         else {
  43                 my @types;
  44
  45                 if ($t & 1) {
  46                         push(@types, "arch_register_type_caller_save");
  47                 }
  48
  49                 if ($t & 2) {
  50                         push(@types, "arch_register_type_callee_save");
  51                 }
  52
  53                 if ($t & 4) {
  54                         push(@types, "arch_register_type_ignore");
  55                 }
  56
  57                 if ($t & 8) {
  58                         push(@types, "arch_register_type_joker");
  59                 }
  60
  61                 if ($t & 16) {
  62                         push(@types, "arch_register_type_virtual");
  63                 }
  64
  65                 return join(" | ", @types);
  66         }
  67 }
  68
  69 # stacks for output
  70 my @obst_regtypes_def; # stack for the register type variables definitions
  71 my @obst_regtypes_decl;# stack for the register type variables declarations
  72 my @obst_regclasses;   # stack for the register class variables
  73 my @obst_classdef;     # stack to define a name for a class index
  74 my @obst_regdef;       # stack to define a name for a register index
  75 my @obst_reginit;      # stack for the register type inits
  76 my @obst_req;          # stack for the register requirements
  77 my @obst_limit_func;   # stack for functions to return a subset of a register class
  78 my @obst_defreq_head;  # stack for prototypes of default requirement function
  79 my @obst_header_all;   # stack for some extern struct defs needed for bearch_$arch include
  80 my @obst_requirement_def;  # stack for requirement name defines
  81
  82 my $numregs;
  83 my $class_ptr;
  84 my $class_idx = 0;
  85
  86 my $tmp;
  87
  88 my %reg2class;
  89
  90 # there is a default NONE requirement
  91 $tmp = "/* Default NONE register requirements */\n";
  92 $tmp .= "const $arch\_register_req_t $arch\_default_req_none = {\n";
  93 $tmp .= "  {\n";
  94 $tmp .= "    arch_register_req_type_none,  /* register type  */\n";
  95 $tmp .= "    NULL,                         /* register class */\n";
  96 $tmp .= "    NULL,                         /* limit function */\n";
  97 $tmp .= "    NULL,                         /* limit environment */\n";
  98 $tmp .= "    NULL,                         /* node for same */\n";
  99 $tmp .= "    NULL                          /* node for different */\n";
 100 $tmp .= "  },\n";
 101 $tmp .= "  0,                              /* same pos */\n";
 102 $tmp .= "  0                               /* different pos */\n";
 103 $tmp .= "};\n\n";
 104 push(@obst_req, $tmp);
 105 push(@obst_header_all, "extern const $arch\_register_req_t $arch\_default_req_none;\n");
 106
 107 push(@obst_classdef, "enum reg_classes {\n");
 108
 109 my $class_mode;
 110
 111 # generate register type and class variable, init function and default requirements
 112 foreach my $class_name (keys(%reg_classes)) {
 113         my @class         = @{ $reg_classes{"$class_name"} };
 114         my $old_classname = $class_name;
 115
 116         $class_name = $arch."_".$class_name;
 117         $numregs    = "N_".$class_name."_REGS";
 118         $class_ptr  = "&".$arch."_reg_classes[CLASS_".$class_name."]";
 119         $class_mode = pop(@class)->{"mode"};
 120
 121         push(@obst_regtypes_decl, "extern arch_register_t ".$class_name."_regs[$numregs];\n");
 122         push(@obst_regtypes_def, "arch_register_t ".$class_name."_regs[$numregs];\n");
 123
 124         push(@obst_classdef, "  CLASS_$class_name = $class_idx,\n");
 125         push(@obst_regclasses, "{ \"$class_name\", $numregs, NULL, ".$class_name."_regs }");
 126
 127         # there is a default NORMAL requirement for each class
 128         $tmp  = "/* Default NORMAL register requirements for class $class_name */\n";
 129         $tmp .= "const $arch\_register_req_t $arch\_default_req_$class_name = {\n";
 130         $tmp .= "  {\n";
 131         $tmp .= "    arch_register_req_type_normal,\n";
 132         $tmp .= "    $class_ptr,\n";
 133         $tmp .= "    NULL,                    /* limit function */ \n";
 134         $tmp .= "    NULL,                    /* limit environment */\n";
 135         $tmp .= "    NULL,                    /* node for same */\n";
 136         $tmp .= "    NULL                     /* node for different */\n";
 137         $tmp .= "  },\n";
 138         $tmp .= "  0,                         /* same pos */\n";
 139         $tmp .= "  0                          /* different pos */\n";
 140         $tmp .= "};\n\n";
 141         push(@obst_req, $tmp);
 142         push(@obst_header_all, "extern const $arch\_register_req_t $arch\_default_req_$class_name;\n");
 143
 144         my $idx = 0;
 145         push(@obst_reginit, "  /* Init of all registers in class '$class_name' */\n\n");
 146         push(@obst_reginit, "  /* set largest possible mode for '$class_name' */\n");
 147         push(@obst_reginit, "  $arch\_reg_classes[CLASS_".$class_name."].mode = $class_mode;\n\n");
 148         push(@obst_regdef, "enum reg_".$class_name."_values {\n");
 149         foreach (@class) {
 150                 # For each class we build for each of it's member registers a limit function
 151                 # which limits the class to this particular register. We also build the
 152                 # corresponding requirement structs.
 153                 # We need those functions to set register requirements on demand in transformation
 154                 # esp. for Call and RegParams where we can mix int and float parameters.
 155
 156                 my $limit_func_name = $arch."_limit_".$class_name."_".$_->{"name"};
 157
 158                 # push the function prototype
 159                 $tmp = "void $limit_func_name(void *_unused, bitset_t *bs)";
 160                 push(@obst_defreq_head, $tmp.";\n");
 161
 162                 # push the function definition
 163                 $tmp .= " {\n";
 164                 $tmp .= "    bs = bitset_clear_all(bs);\n";
 165                 $tmp .= "    bitset_set(bs, REG_".uc($_->{"name"}).");\n";  # REGISTER to index assignment is done some lines down
 166                 $tmp .= "}\n\n";
 167                 push(@obst_limit_func, $tmp);
 168
 169                 # push the default requirement struct
 170                 $tmp  = "const $arch\_register_req_t $arch\_default_req_$class_name\_".$_->{"name"}." = {\n";
 171                 $tmp .= "  {\n";
 172                 $tmp .= "    arch_register_req_type_limited,\n";
 173                 $tmp .= "    $class_ptr,\n";
 174                 $tmp .= "    $limit_func_name,\n";
 175                 $tmp .= "    NULL,                     /* limit environment */\n";
 176                 $tmp .= "    NULL,                     /* node for same */\n";
 177                 $tmp .= "    NULL                      /* node for different */\n";
 178                 $tmp .= "  },\n";
 179                 $tmp .= "  0,                          /* same pos */\n";
 180                 $tmp .= "  0                           /* different pos */\n";
 181                 $tmp .= "};\n\n";
 182                 push(@obst_req, $tmp);
 183                 push(@obst_header_all,"extern const $arch\_register_req_t $arch\_default_req_$class_name\_".$_->{"name"}.";\n");
 184
 185                 $reg2class{$_->{"name"}} = { "class" => $old_classname, "index" => $idx }; # remember reg to class for later use
 186                 push(@obst_regdef, "  REG_".uc($_->{"name"})." = $idx,\n");
 187                 push(@obst_reginit, "  ".$class_name."_regs[$idx].name      = \"".$_->{"name"}."\";\n");
 188                 push(@obst_reginit, "  ".$class_name."_regs[$idx].reg_class = $class_ptr;\n");
 189                 push(@obst_reginit, "  ".$class_name."_regs[$idx].index     = $idx;\n");
 190                 push(@obst_reginit, "  ".$class_name."_regs[$idx].type      = ".translate_reg_type($_->{"type"}).";\n");
 191                 push(@obst_reginit, "\n");
 192                 $idx++;
 193         }
 194         push(@obst_regdef, "  $numregs = $idx\n");
 195         push(@obst_regdef, "};\n\n");
 196
 197         $class_idx++;
 198 }
 199
 200 push(@obst_classdef, "  N_CLASSES = ".scalar(keys(%reg_classes))."\n");
 201 push(@obst_classdef, "};\n\n");
 202
 203 # generate node-register constraints
 204 foreach my $op (keys(%nodes)) {
 205         my %n = %{ $nodes{"$op"} };
 206
 207         next if (!exists($n{"reg_req"}));
 208
 209         $op = $arch."_".$op;
 210
 211         push(@obst_req, "/* IN requirements for '$op' */\n");
 212         # check for argument requirements
 213         if (exists($n{"reg_req"}{"in"})) {
 214                 generate_requirements(\%n, $op, "in");
 215         }
 216
 217         push(@obst_req, "/* OUT requirements for '$op' */\n");
 218         # check for result requirements
 219         if (exists($n{"reg_req"}{"out"})) {
 220                 generate_requirements(\%n, $op, "out");
 221         }
 222 }
 223
 224
 225
 226 # generate header _t (internal usage) file
 227 open(OUT, ">$target_h_t") || die("Could not open $target_h_t, reason: $!\n");
 228
 229 my $creation_time = localtime(time());
 230
 231 $tmp = uc($arch);
 232
 233 print OUT<<EOF;
 234 #ifndef _GEN_$tmp\_REGALLOC_IF_T_H_
 235 #define _GEN_$tmp\_REGALLOC_IF_T_H_
 236
 237 /**
 238  * Generated register classes from spec.
 239  *
 240  * DO NOT EDIT THIS FILE, your changes will be lost.
 241  * Edit $specfile instead.
 242  * created by: $0 $specfile $target_dir
 243  * date:       $creation_time
 244  */
 245
 246 EOF
 247
 248 print OUT @obst_requirement_def;
 249
 250 print OUT "\n#endif /* _GEN_$tmp\_REGALLOC_IF_T_H_ */\n";
 251
 252
 253
 254 # generate header (external usage) file
 255 open(OUT, ">$target_h") || die("Could not open $target_h, reason: $!\n");
 256
 257 $creation_time = localtime(time());
 258
 259 print OUT<<EOF;
 260 #ifndef _GEN_$tmp\_REGALLOC_IF_H_
 261 #define _GEN_$tmp\_REGALLOC_IF_H_
 262
 263 /**
 264  * Contains additional external requirements defs for external includes.
 265  *
 266  * DO NOT EDIT THIS FILE, your changes will be lost.
 267  * Edit $specfile instead.
 268  * created by: $0 $specfile $target_dir
 269  * date:       $creation_time
 270  */
 271
 272 #include "../bearch.h"
 273 #include "$arch\_nodes_attr.h"
 274
 275 EOF
 276
 277 print OUT @obst_regdef, "\n";
 278
 279 print OUT @obst_classdef, "\n";
 280
 281 print OUT @obst_regtypes_decl, "\n";
 282
 283 print OUT "extern arch_register_class_t $arch\_reg_classes[N_CLASSES];\n\n";
 284
 285 print OUT "void ".$arch."_register_init(void *isa_ptr);\n\n";
 286
 287 print OUT @obst_header_all, "\n";
 288
 289 print OUT @obst_defreq_head, "\n";
 290
 291 print OUT "\n#endif /* _GEN_$tmp\_REGALLOC_IF_H_ */\n";
 292
 293 close(OUT);
 294
 295
 296
 297 # generate c inline file
 298 open(OUT, ">$target_c") || die("Could not open $target_c, reason: $!\n");
 299
 300 $creation_time = localtime(time());
 301
 302 print OUT<<EOF;
 303 /**
 304  * The generated interface for the register allocator.
 305  * Contains register classes and types and register constraints
 306  * for all nodes where constraints were given in spec.
 307  *
 308  * DO NOT EDIT THIS FILE, your changes will be lost.
 309  * Edit $specfile instead.
 310  * created by: $0 $specfile $target_dir
 311  * date:       $creation_time
 312  */
 313
 314 #include "gen_$arch\_regalloc_if.h"
 315 #include "bearch_$arch\_t.h"   /* we need this to put the caller saved registers into the isa set */
 316 #include "$arch\_map_regs.h"
 317 #include "irmode.h"
 318
 319 EOF
 320
 321 print OUT "arch_register_class_t $arch\_reg_classes[] = {\n  ".join(",\n  ", @obst_regclasses)."\n};\n\n";
 322
 323 print OUT @obst_regtypes_def, "\n";
 324
 325 print OUT "void ".$arch."_register_init(void *isa_ptr) {\n";
 326 print OUT @obst_reginit;
 327 print OUT "}\n\n";
 328
 329 print OUT @obst_limit_func;
 330
 331 print OUT @obst_req;
 332
 333 close(OUT);
 334
 335 ###
 336 # Remember the register class for each index in the given requirements.
 337 # We need this information for requirements like "in_sX" or "out_dX"
 338 # @return array of classes corresponding to the requirement for each index
 339 ###
 340 sub build_inout_idx_class {
 341         my $n     = shift;
 342         my $op    = shift;
 343         my $inout = shift;
 344         my @idx_class;
 345
 346         if (exists($n->{"reg_req"}{"$inout"})) {
 347                 my @reqs = @{ $n->{"reg_req"}{"$inout"} };
 348
 349                 for (my $idx = 0; $idx <= $#reqs; $idx++) {
 350                         my $class = undef;
 351
 352                         if ($reqs[$idx] eq "none") {
 353                                 $class = "none";
 354                         }
 355                         elsif (is_reg_class($reqs[$idx])) {
 356                                 $class = $reqs[$idx];
 357                         }
 358                         else {
 359                                 my @regs = split(/ /, $reqs[$idx]);
 360 GET_CLASS:              foreach my $reg (@regs) {
 361                                         if ($reg =~ /!?(in|out)\_r\d+/ || $reg =~ /!in/) {
 362                                                 $class = "UNKNOWN_CLASS";
 363                                         }
 364                                         else {
 365                                                 $class = get_reg_class($reg);
 366                                                 if (!defined $class) {
 367                                                         die("Could not get ".uc($inout)." register class for '$op' pos $idx (reg $reg) ... exiting.\n");
 368                                                 }
 369                                                 else {
 370                                                         last GET_CLASS;
 371                                                 } # !defined class
 372                                         } # if (reg =~ ...
 373                                 } # foreach
 374                         } # if
 375
 376                         push(@idx_class, $class);
 377                 } # for
 378         } # if
 379
 380         return @idx_class;
 381 }
 382
 383 ###
 384 # Generates the requirements for the given description
 385 ###
 386 sub generate_requirements {
 387         my $n     = shift;
 388         my $op    = shift;
 389         my $inout = shift;
 390
 391         # get classes for the complementary direction
 392         my $outin     = ($inout eq "in") ? "out" : "in";
 393
 394         my @reqs = @{ $n->{"reg_req"}{"$inout"} };
 395
 396         for (my $idx = 0; $idx <= $#reqs; $idx++) {
 397                 my $class = undef;
 398
 399                 my $tmp2 = "const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx = ";
 400                 my $tmp  = "#define ".$op."_reg_req_$inout\_$idx ";
 401
 402                 if ($reqs[$idx] eq "none") {
 403                         $tmp .= "&$arch\_default_req_none\n";
 404                 }
 405                 elsif ($reqs[$idx] =~ /^new_reg_(.*)$/) {
 406                         if (is_reg_class($1)) {
 407                                 $tmp  .=  "&_".$op."_reg_req_$inout\_$idx\n";
 408                                 $tmp2 .= "{\n";
 409                                 $tmp2 .= "  {\n";
 410                                 $tmp2 .= "    arch_register_req_type_should_be_different_from_all,\n";
 411                                 $tmp2 .= "    &$arch\_reg_classes[CLASS_$arch\_".$1."],\n";
 412                                 $tmp2 .= "    NULL,        /* limit function */\n";
 413                                 $tmp2 .= "    NULL,        /* limit environment */\n";
 414                                 $tmp2 .= "    NULL,        /* same node */\n";
 415                                 $tmp2 .= "    NULL         /* different node */\n";
 416                                 $tmp2 .= "  },\n";
 417                                 $tmp2 .= "  0,\n";
 418                                 $tmp2 .= "  0\n";
 419                                 $tmp2 .= "};\n";
 420
 421                                 push(@obst_req, $tmp2."\n");
 422                                 push(@obst_header_all, "extern const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx;\n");
 423                         }
 424                         else {
 425                                 print STDERR "Invalid register class '$1' given in OUT requirement $idx for '$op'.\n";
 426                         }
 427                 }
 428                 elsif (is_reg_class($reqs[$idx])) {
 429                         $tmp .= "&$arch\_default_req_".$arch."_".$reqs[$idx]."\n";
 430                 }
 431                 else {
 432                         my @req_type_mask;
 433                         my ($class, $has_limit, $same_pos, $different_pos) = build_subset_class_func($n, $op, $idx, (($inout eq "in") ? 1 : 0), $reqs[$idx]);
 434
 435                         if (!defined($class)) {
 436                                 die("Could not build subset for ".uc($inout)." requirements '$op' pos $idx ... exiting.\n");
 437                         }
 438
 439                         if ($has_limit) {
 440                                 push(@req_type_mask, "arch_register_req_type_limited");
 441                         }
 442                         if (defined($same_pos)) {
 443                                 push(@req_type_mask, "arch_register_req_type_should_be_same");
 444                         }
 445                         if (defined($different_pos)) {
 446                                 if ($different_pos == 666) {
 447                                         push(@req_type_mask, "arch_register_req_type_should_be_different_from_all");
 448                                         undef $different_pos;
 449                                 }
 450                                 else {
 451                                         push(@req_type_mask, "arch_register_req_type_should_be_different");
 452                                 }
 453                         }
 454
 455                         $tmp  .= "&_".$op."_reg_req_$inout\_$idx\n";
 456                         $tmp2 .= "{\n";
 457                         $tmp2 .= "  {\n";
 458                         $tmp2 .= "    ".join(" | ", @req_type_mask).",\n";
 459                         $tmp2 .= "    &$arch\_reg_classes[CLASS_$arch\_".$class."],\n";
 460                         $tmp2 .= "    ".($has_limit ? "limit_reg_".$op."_$inout\_".$idx : "NULL").",\n";
 461                         $tmp2 .= "    NULL,        /* limit environment */\n";
 462                         $tmp2 .= "    NULL,        /* same node */\n";
 463                         $tmp2 .= "    NULL         /* different node */\n";
 464                         $tmp2 .= "  },\n";
 465                         $tmp2 .= "  ".(defined($same_pos) ? $same_pos : "0").",\n";
 466                         $tmp2 .= "  ".(defined($different_pos) ? $different_pos : "0")."\n";
 467                         $tmp2 .= "};\n";
 468
 469                         push(@obst_req, $tmp2."\n");
 470                         push(@obst_header_all, "extern const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx;\n");
 471                 }
 472
 473                 push(@obst_requirement_def, $tmp);
 474         }
 475
 476 }
 477
 478 ###
 479 # Determines whether $name is a specified register class or not.
 480 # @return 1 if name is register class, 0 otherwise
 481 ###
 482 sub is_reg_class {
 483         my $name = shift;
 484         return 1 if exists($reg_classes{"$name"});
 485         return 0;
 486 }
 487
 488 ###
 489 # Returns the register class for a given register.
 490 # @return class or undef
 491 ###
 492 sub get_reg_class {
 493         my $reg = shift;
 494         $reg = substr($reg, 1) if ($reg =~ /!.*/);
 495         return $reg2class{"$reg"}{"class"} if (exists($reg2class{"$reg"}));
 496         return undef;
 497 }
 498
 499 ###
 500 # Returns the index of a given register within it's register class.
 501 # @return index or undef
 502 ###
 503 sub get_reg_index {
 504         my $reg = shift;
 505         return $reg2class{"$reg"}{"index"} if (exists($reg2class{"$reg"}));
 506         return undef;
 507 }
 508
 509 ###
 510 # Generates the function for a given $op and a given IN-index
 511 # which returns a subset of possible register from a register class
 512 # @return classname from which the subset is derived or undef and
 513 #         pos which corresponds to in/out reference position or undef
 514 ###
 515 sub build_subset_class_func {
 516         my $neg           = undef;
 517         my $class         = undef;
 518         my $has_limit     = 0;
 519         my $same_pos      = undef;
 520         my $different_pos = undef;
 521         my $temp;
 522         my @obst_init;
 523         my @obst_limits;
 524         my @obst_ignore;
 525
 526
 527         # build function header
 528         my $n   = shift;
 529         my $op  = shift;
 530         my $idx = shift;
 531         my $in  = shift;
 532
 533         my $outin = $in ? "out" : "in";
 534         my @regs  = split(/ /, shift);
 535
 536         my @idx_class = build_inout_idx_class($n, $op, $outin);
 537
 538         # set/unset registers
 539 CHECK_REQS: foreach (@regs) {
 540                 if (/(!)?$outin\_r(\d+)/) {
 541                         if (($1 && defined($different_pos)) || (!$1 && defined($same_pos))) {
 542                                 print STDERR "Multiple in/out references of same type in one requirement not allowed.\n";
 543                                 return (undef, undef, undef, undef);
 544                         }
 545
 546                         if ($1) {
 547                                 $different_pos = $in ? -$2 : $2 - 1;
 548                         }
 549                         else {
 550                                 $same_pos = $in ? -$2 : $2 - 1;
 551                         }
 552
 553                         $class = $idx_class[$2 - 1];
 554                         next CHECK_REQS;
 555                 }
 556                 elsif (/!in/) {
 557                         $class = $idx_class[0];
 558                         return ($class, 0, undef, 666);
 559                 }
 560
 561                 # check for negate
 562                 if (substr($_, 0, 1) eq "!") {
 563                         if (defined($neg) && $neg == 0) {
 564                                 # we have seen a positiv constraint as first one but this one is negative
 565                                 # this doesn't make sense
 566                                 print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n";
 567                                 return (undef, undef, undef, undef);
 568                         }
 569
 570                         if (!defined($neg)) {
 571                                 $has_limit = 1;
 572                                 push(@obst_init, "  bs = bitset_set_all(bs);     /* allow all register (negative constraints given) */\n");
 573                         }
 574
 575                         $_   = substr($_, 1); # skip '!'
 576                         $neg = 1;
 577                 }
 578                 else {
 579                         if (defined($neg) && $neg == 1) {
 580                                 # we have seen a negative constraint as first one but this one is positive
 581                                 # this doesn't make sense
 582                                 print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n";
 583                                 return (undef, undef, undef, undef);
 584                         }
 585
 586                         if (!defined($neg)) {
 587                                 $has_limit = 1;
 588                                 push(@obst_init, "  bs = bitset_clear_all(bs);   /* disallow all register (positive constraints given) */\n");
 589                         }
 590                         $neg = 0;
 591                 }
 592
 593                 # check if register belongs to one of the given classes
 594                 $temp = get_reg_class($_);
 595                 if (!defined($temp)) {
 596                         print STDERR "Unknown register '$_'!\n";
 597                         return (undef, undef, undef, undef);
 598                 }
 599
 600                 # set class
 601                 if (!defined($class)) {
 602                         $class = $temp;
 603                 }
 604                 elsif ($class ne $temp) {
 605                         # all registers must belong to the same class
 606                         print STDERR "Registerclass mismatch. '$_' is not member of class '$class'.\n";
 607                         return (undef, undef, undef, undef);
 608                 }
 609
 610                 if ($neg == 1) {
 611                         $has_limit = 1;
 612                         push(@obst_limits, "  bitset_clear(bs, ".get_reg_index($_).");         /* disallow $_ */\n");
 613                 }
 614                 else {
 615                         $has_limit = 1;
 616                         push(@obst_limits, "  bitset_set(bs, ".get_reg_index($_).");           /* allow $_ */\n");
 617                 }
 618         }
 619
 620         my @cur_class = @{ $reg_classes{"$class"} };
 621         for (my $idx = 0; $idx <= $#cur_class; $idx++) {
 622                 if (defined($cur_class[$idx]{"type"}) && ($cur_class[$idx]{"type"} & 4)) {
 623                         push(@obst_ignore, "  bitset_clear(bs, ".get_reg_index($cur_class[$idx]{"name"}).");");
 624                         push(@obst_ignore, "         /* disallow ignore reg ".$cur_class[$idx]{"name"}." */\n");
 625                 }
 626         }
 627
 628         if ($has_limit == 1) {
 629                 push(@obst_header_all, "void limit_reg_".$op."_".($in ? "in" : "out")."_".$idx."(void *_unused, bitset_t *bs);\n");
 630
 631                 push(@obst_limit_func, "/* limit the possible registers for ".($in ? "IN" : "OUT")." $idx at op $op */\n");
 632                 push(@obst_limit_func, "void limit_reg_".$op."_".($in ? "in" : "out")."_".$idx."(void *_unused, bitset_t *bs) {\n");
 633                 push(@obst_limit_func, @obst_init);
 634                 push(@obst_limit_func, @obst_ignore);
 635                 push(@obst_limit_func, @obst_limits);
 636                 push(@obst_limit_func, "}\n\n");
 637         }
 638
 639         return ($class, $has_limit, $same_pos, $different_pos);
 640 }