#!/usr/bin/perl -w
-# This script generates C code which emits assembler code for the
-# assembler ir nodes. It takes a "emit" key from the node specification
-# and substitutes lines starting with . with a corresponding fprintf().
+#
+# Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
+#
+# This file is part of libFirm.
+#
+# This file may be distributed and/or modified under the terms of the
+# GNU General Public License version 2 as published by the Free Software
+# Foundation and appearing in the file LICENSE.GPL included in the
+# packaging of this file.
+#
+# Licensees holding valid libFirm Professional Edition licenses may use
+# this file in accordance with the libFirm Commercial License.
+# Agreement provided with the Software.
+#
+# This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+# WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE.
+#
+
+# This script generates C code which creates ands sets up functions and
+# data structures for the register allocator.
# Creation: 2005/11/14
-# $Id$
use strict;
use Data::Dumper;
+use integer;
my $specfile = $ARGV[0];
my $target_dir = $ARGV[1];
our $arch;
our %reg_classes;
-our %nodes;
+our %cpu;
# include spec file
my $return;
-no strict "subs";
+use strict "subs";
unless ($return = do $specfile) {
- warn "couldn't parse $specfile: $@" if $@;
- warn "couldn't do $specfile: $!" unless defined $return;
- warn "couldn't run $specfile" unless $return;
+ die "Fatal error: couldn't parse $specfile: $@" if $@;
+ die "Fatal error: couldn't do $specfile: $!" unless defined $return;
+ die "Fatal error: couldn't run $specfile" unless $return;
}
use strict "subs";
my $target_c = $target_dir."/gen_".$arch."_regalloc_if.c";
my $target_h = $target_dir."/gen_".$arch."_regalloc_if.h";
-my $target_h_t = $target_dir."/gen_".$arch."_regalloc_if_t.h";
# helper function
-my @rt = ("arch_register_type_none",
- "arch_register_type_write_invariant",
- "arch_register_type_caller_saved",
- "arch_register_type_callee_saved",
- "arch_register_type_ignore");
+sub map_flags {
+ my $prefix = shift;
+ my $flags = shift || "none";
+ return join(" | ", map { "$prefix$_" } split(/\s*\|\s*/, $flags));
+}
# stacks for output
-my @obst_regtypes; # stack for the register type variables
-my @obst_regclasses; # stack for the register class variables
-my @obst_classdef; # stack to define a name for a class index
-my @obst_regdef; # stack to define a name for a register index
-my @obst_reginit; # stack for the register type inits
-my @obst_req; # stack for the register requirements
-my @obst_limit_func; # stack for functions to return a subset of a register class
-my @obst_defreq_head; # stack for prototypes of default requirement function
-my @obst_header_all; # stack for some extern struct defs needed for bearch_$arch include
-my @obst_projnum_map; # stack for mapping register projnums to requirements
-
-my $numregs;
+my $regtypes_def; # stack for the register type variables definitions
+my $regtypes_decl;# stack for the register type variables declarations
+my @regclasses; # stack for the register class variables
+my $classdef; # stack to define a name for a class index
+my $regdef; # stack to define a name for a register index
+my $regdef2;
+my $regcounts;
+my $reginit; # stack for the register type inits
+my $single_constraints_decls;
+my $single_constraints;
+
my $class_ptr;
my $class_idx = 0;
-my $tmp;
+my %regclass2len = ();
+my %reg2class = ();
-my %reg2class;
+$classdef .= "enum reg_classes {\n";
-# there is a default NONE requirement
-$tmp = "/* Default NONE register requirements */\n";
-$tmp .= "const $arch\_register_req_t $arch\_default_req_none = {\n";
-$tmp .= " {\n";
-$tmp .= " arch_register_req_type_none,\n";
-$tmp .= " NULL,\n";
-$tmp .= " NULL,\n";
-$tmp .= " NULL\n";
-$tmp .= " },\n";
-$tmp .= " 0\n";
-$tmp .= "};\n\n";
-push(@obst_req, $tmp);
+my $class_mode;
-push(@obst_header_all, "extern arch_register_class_t $arch\_reg_classes[N_CLASSES];\n\n");
-push(@obst_header_all, "extern const $arch\_register_req_t $arch\_default_req_none;\n");
+foreach my $class_name (keys(%reg_classes)) {
+ my @class = @{ $reg_classes{"$class_name"} };
+
+ my $idx = 0;
+ foreach (@class) {
+ if (defined($_->{name})) {
+ $reg2class{$_->{name}} = {
+ "class" => $class_name,
+ "index" => $idx
+ };
+ }
+ $idx++;
+ }
+ $regclass2len{$class_name} = $idx;
+}
-push(@obst_classdef, "#define N_CLASSES ".scalar(keys(%reg_classes))."\n");
+sub get_limited_array {
+ my $reg = shift;
+ my $regclass = $reg2class{"$reg"}{"class"};
+ my $ucname = uc($reg);
+ my $result = "{ ";
+
+ my $limitedbitsetlen = $regclass2len{$regclass};
+ my $arraylen = ($limitedbitsetlen+31) / 32;
+ my $firstreg = uc($reg_classes{$regclass}[0]->{"name"});
+ my $classuc = uc($regclass);
+ my $first = 1;
+ for (my $i = 0; $i < $arraylen; ++$i) {
+ if ($first) {
+ $first = 0;
+ } else {
+ $result .= ", ";
+ }
-my $global_projnum_idx = 0;
+ my $index = $reg2class{"$reg"}{"index"};
+ if ($index >= $i*32 && $index < ($i+1)*32) {
+ if ($i > 0) {
+ $result .= "(1 << (REG_${classuc}_${ucname} % 32))";
+ } else {
+ $result .= "(1 << REG_${classuc}_${ucname})";
+ }
+ } else {
+ $result .= "0";
+ }
+ }
+ $result .= " }";
+}
# generate register type and class variable, init function and default requirements
foreach my $class_name (keys(%reg_classes)) {
my $old_classname = $class_name;
$class_name = $arch."_".$class_name;
- $numregs = "N_".$class_name."_REGS";
$class_ptr = "&".$arch."_reg_classes[CLASS_".$class_name."]";
+ my $flags = pop(@class);
+ $class_mode = $flags->{"mode"};
+ my $flags_prepared = map_flags("arch_register_class_flag_", $flags->{"flags"});
+
+ $single_constraints .= <<EOF;
+static const arch_register_req_t ${arch}_class_reg_req_${old_classname} = {
+ arch_register_req_type_normal,
+ &${arch}_reg_classes[CLASS_${arch}_${old_classname}],
+ NULL,
+ 0,
+ 0,
+ 1
+};
+EOF
- push(@obst_regtypes, "#define $numregs ".($#class + 1)."\n");
- push(@obst_regtypes, "arch_register_t ".$class_name."_regs[$numregs];\n\n");
-
- push(@obst_classdef, "#define CLASS_$class_name $class_idx\n");
- push(@obst_regclasses, "{ \"$class_name\", $numregs, ".$class_name."_regs }");
-
- # there is a default NORMAL requirement for each class
- $tmp = "/* Default NORMAL register requirements for class $class_name */\n";
- $tmp .= "const $arch\_register_req_t $arch\_default_req_$class_name = {\n";
- $tmp .= " {\n";
- $tmp .= " arch_register_req_type_normal,\n";
- $tmp .= " $class_ptr,\n";
- $tmp .= " NULL,\n";
- $tmp .= " NULL\n";
- $tmp .= " },\n";
- $tmp .= " 0\n";
- $tmp .= "};\n\n";
- push(@obst_req, $tmp);
-
- push(@obst_header_all, "\nextern const $arch\_register_req_t $arch\_default_req_$class_name;\n");
+ $classdef .= "\tCLASS_$class_name = $class_idx,\n";
+ my $numregs = @class;
+ my $first_reg = "&${arch}_registers[REG_". uc($class[0]->{"name"}) . "]";
+ push(@regclasses, "{ $class_idx, \"$class_name\", $numregs, NULL, $first_reg, $flags_prepared, &${arch}_class_reg_req_${old_classname} }");
my $idx = 0;
- push(@obst_reginit, " /* Init of all registers in class '$class_name' */\n\n");
+ $reginit .= "\t$arch\_reg_classes[CLASS_".$class_name."].mode = $class_mode;\n";
+ my $lastreg;
foreach (@class) {
- # For each class we build for each of it's member registers a limit function
- # which limits the class to this particular register. We also build the
- # corresponding requirement structs.
- # We need those functions to set register requirements on demand in transformation
- # esp. for Call and RegParams where we can mix int and float parameters.
-
- my $limit_func_name = $arch."_limit_".$class_name."_".$_->{"name"};
-
- # push the function prototype
- $tmp = "void $limit_func_name(const ir_node *irn, int pos, bitset_t *bs)";
- push(@obst_defreq_head, $tmp.";\n");
-
- # push the function definition
- $tmp .= " {\n";
- $tmp .= " bs = bitset_clear_all(bs);\n";
- $tmp .= " bitset_set(bs, REG_".uc($_->{"name"}).");\n"; # REGISTER to index assignment is done some lines down
- $tmp .= "}\n\n";
- push(@obst_limit_func, $tmp);
-
- # push the default requirement struct
- $tmp = "const $arch\_register_req_t $arch\_default_req_$class_name\_".$_->{"name"}." = {\n";
- $tmp .= " {\n";
- $tmp .= " arch_register_req_type_limited,\n";
- $tmp .= " $class_ptr,\n";
- $tmp .= " $limit_func_name,\n";
- $tmp .= " NULL\n";
- $tmp .= " },\n";
- $tmp .= " 0\n";
- $tmp .= "};\n\n";
- push(@obst_req, $tmp);
-
- push(@obst_header_all, "extern const $arch\_register_req_t $arch\_default_req_$class_name\_".$_->{"name"}.";\n");
-
- $reg2class{$_->{"name"}} = { "class" => $old_classname, "index" => $idx }; # remember reg to class for later use
- push(@obst_regdef, "#define REG_".uc($_->{"name"})." $idx\n");
- push(@obst_reginit, " ".$class_name."_regs[$idx].name = \"".$_->{"name"}."\";\n");
- push(@obst_reginit, " ".$class_name."_regs[$idx].reg_class = $class_ptr;\n");
- push(@obst_reginit, " ".$class_name."_regs[$idx].index = $idx;\n");
- push(@obst_reginit, " ".$class_name."_regs[$idx].type = ".$rt[$_->{"type"}].";\n");
- if ($_->{"type"} == 2) {
- # this is a caller saved register
- push(@obst_reginit, " ia32_set_reg_projnum(&".$class_name."_regs[$idx], $global_projnum_idx, isa->reg_projnum_map);\n");
- push(@obst_projnum_map, "&$arch\_default_req_$class_name\_".$_->{"name"});
- $global_projnum_idx++;
+ my $name = $_->{"name"};
+ my $ucname = uc($name);
+ my $type = map_flags("arch_register_type_", $_->{"type"});
+ # realname is name if not set by user
+ $_->{"realname"} = $_->{"name"} if (! exists($_->{"realname"}));
+ my $realname = $_->{realname};
+ my $classuc = uc($old_classname);
+
+ $regdef .= "\tREG_${ucname},\n";
+ $regdef2 .= "\tREG_${classuc}_${ucname} = $idx,\n";
+ my $dwarf_number = 0;
+ if (defined($_->{dwarf})) {
+ $dwarf_number = $_->{dwarf};
}
- push(@obst_reginit, "\n");
- $idx++;
- }
-
- $class_idx++;
-}
-
-push(@obst_regdef, "\n#define N_CALLER_SAVE_REGS ".scalar(@obst_projnum_map)."\n");
-
-push(@obst_header_all, "\nextern const $arch\_register_req_t *$arch\_projnum_reg_req_map[N_CALLER_SAVE_REGS];\n\n");
-push(@obst_header_all, "\n/* node specific requirements */\n");
-
-# generate node-register constraints
-foreach my $op (keys(%nodes)) {
- my %n = %{ $nodes{"$op"} };
- next if (!exists($n{"reg_req"}));
+ $regtypes_def .= <<EOF;
+ {
+ "${realname}",
+ ${class_ptr},
+ REG_${classuc}_${ucname},
+ REG_${ucname},
+ ${type},
+ &${arch}_single_reg_req_${old_classname}_${name},
+ ${dwarf_number}
+ },
+EOF
- $op = $arch."_".$op;
+ my $limitedarray = get_limited_array($name);
+ $single_constraints .= <<EOF;
+static const unsigned ${arch}_limited_${old_classname}_${name} [] = ${limitedarray};
+static const arch_register_req_t ${arch}_single_reg_req_${old_classname}_${name} = {
+ arch_register_req_type_limited,
+ ${class_ptr},
+ ${arch}_limited_${old_classname}_${name},
+ 0,
+ 0,
+ 1
+};
+EOF
- push(@obst_req, "/* IN requirements for '$op' */\n");
- # check for argument requirements
- if (exists($n{"reg_req"}{"in"})) {
- generate_requirements(\%n, $op, "in");
+ $lastreg = $ucname;
+ $idx++;
}
+ $regcounts .= "\tN_${class_name}_REGS = $numregs,\n";
- push(@obst_req, "/* OUT requirements for '$op' */\n");
- # check for result requirements
- if (exists($n{"reg_req"}{"out"})) {
- generate_requirements(\%n, $op, "out");
- }
+ $class_idx++;
}
+my $archuc = uc($arch);
+$classdef .= "\tN_${archuc}_CLASSES = ".scalar(keys(%reg_classes))."\n";
+$classdef .= "};\n\n";
-# generate header _t (internal usage) file
-open(OUT, ">$target_h_t") || die("Could not open $target_h_t, reason: $!\n");
+# generate header (external usage) file
+open(OUT, ">$target_h") || die("Fatal error: Could not open $target_h, reason: $!\n");
my $creation_time = localtime(time());
-$tmp = uc($arch);
-
print OUT<<EOF;
-#ifndef _GEN_$tmp\_REGALLOC_IF_T_H_
-#define _GEN_$tmp\_REGALLOC_IF_T_H_
-
/**
- * Generated register classes from spec.
- *
- * DO NOT EDIT THIS FILE, your changes will be lost.
- * Edit $specfile instead.
- * created by: $0 $specfile $target_dir
- * date: $creation_time
+ * \@file
+ * \@brief Contains additional external requirements defs for external includes.
+ * \@note DO NOT EDIT THIS FILE, your changes will be lost.
+ * Edit $specfile instead.
+ * created by: $0 $specfile $target_dir
+ * \@date $creation_time
*/
+#ifndef FIRM_BE_${archuc}_GEN_${archuc}_REGALLOC_IF_H
+#define FIRM_BE_${archuc}_GEN_${archuc}_REGALLOC_IF_H
-#include "../bearch.h"
-#include "$arch\_nodes_attr.h"
-
-EOF
-
-print OUT @obst_regdef, "\n";
+#include "bearch.h"
+#include "${arch}_nodes_attr.h"
-print OUT @obst_classdef, "\n";
+/** global register indices for ${arch} registers */
+enum reg_indices {
+${regdef}
+ N_${archuc}_REGISTERS
+};
+/** local register indices for ${arch} registers */
+enum {
+${regdef2}
+};
-print OUT @obst_regtypes, "\n";
+/** number of registers in ${arch} register classes. */
+enum {
+${regcounts}
+};
+${classdef}
-print OUT @obst_defreq_head, "\n";
+extern const arch_register_t ${arch}_registers[N_${archuc}_REGISTERS];
-print OUT "void ".$arch."_register_init(void *isa_ptr);\n\n";
+extern arch_register_class_t ${arch}_reg_classes[N_${archuc}_CLASSES];
-print OUT "\n#endif /* _GEN_$tmp\_REGALLOC_IF_T_H_ */\n";
+void ${arch}_register_init(void);
+#endif
+EOF
+close(OUT);
-# generate header (external usage) file
-open(OUT, ">$target_h") || die("Could not open $target_h, reason: $!\n");
+# generate c file
+open(OUT, ">$target_c") || die("Fatal error: Could not open $target_c, reason: $!\n");
$creation_time = localtime(time());
print OUT<<EOF;
-#ifndef _GEN_$tmp\_REGALLOC_IF_H_
-#define _GEN_$tmp\_REGALLOC_IF_H_
-
/**
- * Contains additional external requirements defs for external includes.
- *
- * DO NOT EDIT THIS FILE, your changes will be lost.
- * Edit $specfile instead.
- * created by: $0 $specfile $target_dir
- * date: $creation_time
+ * \@file
+ * \@brief The generated interface for the register allocator.
+ * Contains register classes and types and register constraints
+ * for all nodes where constraints were given in spec.
+ * \@note DO NOT EDIT THIS FILE, your changes will be lost.
+ * Edit $specfile instead.
+ * created by: $0 $specfile $target_dir
+ * \$date $creation_time
*/
+#include "config.h"
-#include "gen_$arch\_regalloc_if_t.h"
+#include "gen_${arch}_regalloc_if.h"
+#include "bearch_${arch}_t.h"
+#include "irmode.h"
+${single_constraints}
EOF
-print OUT @obst_header_all;
-
-print OUT "\n#endif /* _GEN_$tmp\_REGALLOC_IF_H_ */\n";
-
-close(OUT);
+print OUT "arch_register_class_t ${arch}_reg_classes[] = {\n\t".join(",\n\t", @regclasses)."\n};\n\n";
+print OUT<<EOF;
+/** The array of all registers in the ${arch} architecture, sorted by its global index.*/
+const arch_register_t ${arch}_registers[] = {
+${regtypes_def}
+};
-# generate c inline file
-open(OUT, ">$target_c") || die("Could not open $target_c, reason: $!\n");
-
-$creation_time = localtime(time());
-
-print OUT<<EOF;
/**
- * The generated interface for the register allocator.
- * Contains register classes and types and register constraints
- * for all nodes where constraints were given in spec.
- *
- * DO NOT EDIT THIS FILE, your changes will be lost.
- * Edit $specfile instead.
- * created by: $0 $specfile $target_dir
- * date: $creation_time
+ * Initializes ${arch} register classes.
*/
-
-#include "gen_$arch\_regalloc_if.h"
-#include "bearch_ia32_t.h" /* we need this to put the caller saved registers into the isa set */
-#include "ia32_map_regs.h"
-
+void ${arch}_register_init(void)
+{
+${reginit}
+}
EOF
-
-print OUT "arch_register_class_t $arch\_reg_classes[] = {\n ".join(",\n ", @obst_regclasses)."\n};\n\n";
-
-print OUT "const $arch\_register_req_t *$arch\_projnum_reg_req_map[] = {\n ".join(",\n ", @obst_projnum_map)."\n};\n\n";
-
-print OUT "void ".$arch."_register_init(void *isa_ptr) {\n";
-print OUT " ia32_isa_t *isa = (ia32_isa_t *)isa_ptr;\n\n";
-print OUT @obst_reginit;
-print OUT "}\n\n";
-
-print OUT @obst_limit_func;
-print OUT @obst_req;
-
close(OUT);
-
-###
-# Remember the register class for each index in the given requirements.
-# We need this information for requirements like "in_sX" or "out_dX"
-# @return array of classes corresponding to the requirement for each index
-###
-sub build_inout_idx_class {
- my $n = shift;
- my $op = shift;
- my $inout = shift;
- my @idx_class;
-
- if (exists($n->{"reg_req"}{"$inout"})) {
- my @reqs = @{ $n->{"reg_req"}{"$inout"} };
-
- for (my $idx = 0; $idx <= $#reqs; $idx++) {
- my $class = undef;
-
- if ($reqs[$idx] eq "none") {
- $class = "none";
- }
- elsif (is_reg_class($reqs[$idx])) {
- $class = $reqs[$idx];
- }
- else {
- my @regs = split(/ /, $reqs[$idx]);
-GET_CLASS: foreach my $reg (@regs) {
- if ($reg =~ /!?(in|out)\_r\d+/) {
- $class = "UNKNOWN_CLASS";
- }
- else {
- $class = get_reg_class($reg);
- if (!defined $class) {
- die("Could not get ".uc($inout)." register class for '$op' pos $idx (reg $reg) ... exiting.\n");
- }
- else {
- last GET_CLASS;
- } # !defined class
- } # if (reg =~ ...
- } # foreach
- } # if
-
- push(@idx_class, $class);
- } # for
- } # if
-
- return @idx_class;
-}
-
-###
-# Generates the requirements for the given description
-###
-sub generate_requirements {
- my $n = shift;
- my $op = shift;
- my $inout = shift;
-
- # get classes for the complementary direction
- my $outin = ($inout eq "in") ? "out" : "in";
-
- my @reqs = @{ $n->{"reg_req"}{"$inout"} };
-
- for (my $idx = 0; $idx <= $#reqs; $idx++) {
- my $class = undef;
-
- my $tmp2 = "const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx = ";
- my $tmp = "const $arch\_register_req_t *".$op."_reg_req_$inout\_$idx = ";
-
- push(@obst_header_all, "extern const $arch\_register_req_t *".$op."_reg_req_$inout\_$idx;\n");
-
- if ($reqs[$idx] eq "none") {
- $tmp .= "&$arch\_default_req_none;\n";
- }
- elsif (is_reg_class($reqs[$idx])) {
- $tmp .= "&$arch\_default_req_".$arch."_".$reqs[$idx].";\n";
- }
- else {
- my @req_type_mask;
- my ($class, $has_limit, $pos, $same) = build_subset_class_func($n, $op, $idx, (($inout eq "in") ? 1 : 0), $reqs[$idx]);
- if (!defined($class)) {
- die("Could not build subset for ".uc($inout)." requirements '$op' pos $idx ... exiting.\n");
- }
- if ($has_limit) {
- push(@req_type_mask, "arch_register_req_type_limited");
- }
- if (defined($pos)) {
- push(@req_type_mask, "arch_register_req_type_should_be_".($same ? "same" : "different"));
- }
- $tmp .= "&_".$op."_reg_req_$inout\_$idx;\n";
- $tmp2 .= " {\n";
- $tmp2 .= " {\n";
- $tmp2 .= " ".join(" | ", @req_type_mask).",\n";
- $tmp2 .= " &$arch\_reg_classes[CLASS_$arch\_".$class."],\n";
- $tmp2 .= " ".($has_limit ? "limit_reg_".$op."_$inout\_".$idx : "NULL").",\n";
- $tmp2 .= " NULL\n";
- $tmp2 .= " },\n";
- $tmp2 .= " ".(defined($pos) ? $pos : "0")."\n};\n";
-
- $tmp = $tmp2.$tmp;
- }
-
- push(@obst_req, $tmp."\n");
- }
-
-}
-
-###
-# Determines whether $name is a specified register class or not.
-# @return 1 if name is register class, 0 otherwise
-###
-sub is_reg_class {
- my $name = shift;
- return 1 if exists($reg_classes{"$name"});
- return 0;
-}
-
-###
-# Returns the register class for a given register.
-# @return class or undef
-###
-sub get_reg_class {
- my $reg = shift;
- return $reg2class{"$reg"}{"class"} if (exists($reg2class{"$reg"}));
- return undef;
-}
-
-###
-# Returns the index of a given register within it's register class.
-# @return index or undef
-###
-sub get_reg_index {
- my $reg = shift;
- return $reg2class{"$reg"}{"index"} if (exists($reg2class{"$reg"}));
- return undef;
-}
-
-###
-# Generates the function for a given $op and a given IN-index
-# which returns a subset of possible register from a register class
-# @return classname from which the subset is derived or undef and
-# pos which corresponds to in/out reference position or undef
-###
-sub build_subset_class_func {
- my $neg = undef;
- my $class = undef;
- my $temp;
- my $has_limit = 0;
-
- # build function header
- my $n = shift;
- my $op = shift;
- my $idx = shift;
- my $in = shift;
- my $pos = undef;
- my $same = 1;
-
- my @temp_obst;
-
- my $outin = $in ? "out" : "in";
- my @regs = split(/ /, shift);
-
- my @idx_class = build_inout_idx_class($n, $op, $outin);
-
- # set/unset registers
-CHECK_REQS: foreach (@regs) {
- if (/(!)?$outin\_r(\d+)/) {
- if (defined($pos)) {
- print STDERR "Multiple in/out references in one requirement not allowed.\n";
- return (undef, undef, undef, undef);
- }
- $same = 0 if ($1);
- $class = $idx_class[$2 - 1];
- $pos = $in ? -$2 : $2 - 1;
- next CHECK_REQS;
- }
-
- # check for negate
- if (substr($_, 0, 1) eq "!") {
- if (defined($neg) && $neg == 0) {
- # we have seen a positiv constraint as first one but this one is negative
- # this doesn't make sense
- print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n";
- return (undef, undef, undef, undef);
- }
-
- if (!defined($neg)) {
- $has_limit = 1;
- push(@temp_obst, " bs = bitset_set_all(bs); /* allow all register (negative constraints given) */\n");
- }
-
- $_ = substr($_, 1); # skip '!'
- $neg = 1;
- }
- else {
- if (defined($neg) && $neg == 1) {
- # we have seen a negative constraint as first one but this one is positive
- # this doesn't make sense
- print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n";
- return (undef, undef, undef, undef);
- }
-
- if (!defined($neg)) {
- $has_limit = 1;
- push(@temp_obst, " bs = bitset_clear_all(bs); /* disallow all register (positive constraints given) */\n");
- }
- $neg = 0;
- }
-
- # check if register belongs to one of the given classes
- $temp = get_reg_class($_);
- if (!defined($temp)) {
- print STDERR "Unknown register '$_'!\n";
- return (undef, undef, undef, undef);
- }
-
- # set class
- if (!defined($class)) {
- $class = $temp;
- }
- elsif ($class ne $temp) {
- # all registers must belong to the same class
- print STDERR "Registerclass mismatch. '$_' is not member of class '$class'.\n";
- return (undef, undef, undef, undef);
- }
-
- if ($neg == 1) {
- $has_limit = 1;
- push(@temp_obst, " bitset_clear(bs, ".get_reg_index($_)."); /* disallow $_ */\n");
- }
- else {
- $has_limit = 1;
- push(@temp_obst, " bitset_set(bs, ".get_reg_index($_)."); /* allow $_ */\n");
- }
- }
-
- if ($has_limit == 1) {
- push(@obst_limit_func, "/* limit the possible registers for ".($in ? "IN" : "OUT")." $idx at op $op */\n");
- push(@obst_limit_func, "void limit_reg_".$op."_".($in ? "in" : "out")."_".$idx."(const ir_node *irn, int pos, bitset_t *bs) {\n");
- push(@obst_limit_func, @temp_obst);
- push(@obst_limit_func, "}\n\n");
- }
-
- return ($class, $has_limit, $pos, $same);
-}
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