[OpenSPARC-T2-DV] / tools / perl-5.8.0 / lib / 5.8.0 / sun4-solaris / B / Assembler.pm

#      Assembler.pm
#
#      Copyright (c) 1996 Malcolm Beattie
#
#      You may distribute under the terms of either the GNU General Public
#      License or the Artistic License, as specified in the README file.

package B::Assembler;
use Exporter;
use B qw(ppname);
use B::Asmdata qw(%insn_data @insn_name);
use Config qw(%Config);
require ByteLoader;		# we just need its $VERSIOM

@ISA = qw(Exporter);
@EXPORT_OK = qw(assemble_fh newasm endasm assemble);
$VERSION = 0.04;

use strict;
my %opnumber;
my ($i, $opname);
for ($i = 0; defined($opname = ppname($i)); $i++) {
    $opnumber{$opname} = $i;
}

my($linenum, $errors, $out); #	global state, set up by newasm

sub error {
    my $str = shift;
    warn "$linenum: $str\n";
    $errors++;
}

my $debug = 0;
sub debug { $debug = shift }

sub limcheck($$$$){
    my( $val, $lo, $hi, $loc ) = @_;
    if( $val < $lo || $hi < $val ){
        error "argument for $loc outside [$lo, $hi]: $val";
        $val = $hi;
    }
    return $val;
}

#
# First define all the data conversion subs to which Asmdata will refer
#

sub B::Asmdata::PUT_U8 {
    my $arg = shift;
    my $c = uncstring($arg);
    if (defined($c)) {
	if (length($c) != 1) {
	    error "argument for U8 is too long: $c";
	    $c = substr($c, 0, 1);
	}
    } else {
        $arg = limcheck( $arg, 0, 0xff, 'U8' );
	$c = chr($arg);
    }
    return $c;
}

sub B::Asmdata::PUT_U16 {
    my $arg = limcheck( $_[0], 0, 0xffff, 'U16' );
    pack("S", $arg);
}
sub B::Asmdata::PUT_U32 {
    my $arg = limcheck( $_[0], 0, 0xffffffff, 'U32' );
    pack("L", $arg);
}
sub B::Asmdata::PUT_I32 {
    my $arg = limcheck( $_[0], -0x80000000, 0x7fffffff, 'I32' );
    pack("l", $arg);
}
sub B::Asmdata::PUT_NV  { sprintf("%s\0", $_[0]) } # "%lf" looses precision and pack('d',...)
						   # may not even be portable between compilers
sub B::Asmdata::PUT_objindex { # could allow names here
    my $arg = limcheck( $_[0], 0, 0xffffffff, '*index' );
    pack("L", $arg);
} 
sub B::Asmdata::PUT_svindex { &B::Asmdata::PUT_objindex }
sub B::Asmdata::PUT_opindex { &B::Asmdata::PUT_objindex }
sub B::Asmdata::PUT_pvindex { &B::Asmdata::PUT_objindex }

sub B::Asmdata::PUT_strconst {
    my $arg = shift;
    my $str = uncstring($arg);
    if (!defined($str)) {
	error "bad string constant: $arg";
	$str = '';
    }
    if ($str =~ s/\0//g) {
	error "string constant argument contains NUL: $arg";
        $str = '';
    }
    return $str . "\0";
}

sub B::Asmdata::PUT_pvcontents {
    my $arg = shift;
    error "extraneous argument: $arg" if defined $arg;
    return "";
}
sub B::Asmdata::PUT_PV {
    my $arg = shift;
    my $str = uncstring($arg);
    if( ! defined($str) ){
        error "bad string argument: $arg";
        $str = '';
    }
    return pack("L", length($str)) . $str;
}
sub B::Asmdata::PUT_comment_t {
    my $arg = shift;
    $arg = uncstring($arg);
    error "bad string argument: $arg" unless defined($arg);
    if ($arg =~ s/\n//g) {
	error "comment argument contains linefeed: $arg";
    }
    return $arg . "\n";
}
sub B::Asmdata::PUT_double { sprintf("%s\0", $_[0]) } # see PUT_NV above
sub B::Asmdata::PUT_none {
    my $arg = shift;
    error "extraneous argument: $arg" if defined $arg;
    return "";
}
sub B::Asmdata::PUT_op_tr_array {
    my $arg = shift;
    my @ary = split(/\s*,\s*/, $arg);
    if (@ary != 256) {
	error "wrong number of arguments to op_tr_array";
	@ary = (0) x 256;
    }
    return pack("S256", @ary);
}
# XXX Check this works
# Note: $arg >> 32 is a no-op on 32-bit systems
sub B::Asmdata::PUT_IV64 {
    my $arg = shift;
    return pack("LL", ($arg >> 16) >>16 , $arg & 0xffffffff);
}

sub B::Asmdata::PUT_IV {
    $Config{ivsize} == 4 ? &B::Asmdata::PUT_I32 : &B::Asmdata::PUT_IV64;
}

my %unesc = (n => "\n", r => "\r", t => "\t", a => "\a",
	     b => "\b", f => "\f", v => "\013");

sub uncstring {
    my $s = shift;
    $s =~ s/^"// and $s =~ s/"$// or return undef;
    $s =~ s/\\(\d\d\d|.)/length($1) == 3 ? chr(oct($1)) : ($unesc{$1}||$1)/eg;
    return $s;
}

sub strip_comments {
    my $stmt = shift;
    # Comments only allowed in instructions which don't take string arguments
    # Treat string as a single line so .* eats \n characters.
    $stmt =~ s{
	^\s*	# Ignore leading whitespace
	(
	  [^"]*	# A double quote '"' indicates a string argument. If we
		# find a double quote, the match fails and we strip nothing.
	)
	\s*\#	# Any amount of whitespace plus the comment marker...
	.*$	# ...which carries on to end-of-string.
    }{$1}sx;	# Keep only the instruction and optional argument.
    return $stmt;
}

# create the ByteCode header: magic, archname, ByteLoader $VERSION, ivsize,
# 	ptrsize, byteorder
# nvtype is irrelevant (floats are stored as strings)
# byteorder is strconst not U32 because of varying size issues

sub gen_header {
    my $header = "";

    $header .= B::Asmdata::PUT_U32(0x43424c50);	# 'PLBC'
    $header .= B::Asmdata::PUT_strconst('"' . $Config{archname}. '"');
    $header .= B::Asmdata::PUT_strconst(qq["$ByteLoader::VERSION"]);
    $header .= B::Asmdata::PUT_U32($Config{ivsize});
    $header .= B::Asmdata::PUT_U32($Config{ptrsize});
    $header .= B::Asmdata::PUT_strconst(sprintf(qq["0x%s"], $Config{byteorder}));

    $header;
}

sub parse_statement {
    my $stmt = shift;
    my ($insn, $arg) = $stmt =~ m{
	^\s*	# allow (but ignore) leading whitespace
	(.*?)	# Instruction continues up until...
	(?:	# ...an optional whitespace+argument group
	    \s+		# first whitespace.
	    (.*)	# The argument is all the rest (newlines included).
	)?$	# anchor at end-of-line
    }sx;
    if (defined($arg)) {
	if ($arg =~ s/^0x(?=[0-9a-fA-F]+$)//) {
	    $arg = hex($arg);
	} elsif ($arg =~ s/^0(?=[0-7]+$)//) {
	    $arg = oct($arg);
	} elsif ($arg =~ /^pp_/) {
	    $arg =~ s/\s*$//; # strip trailing whitespace
	    my $opnum = $opnumber{$arg};
	    if (defined($opnum)) {
		$arg = $opnum;
	    } else {
		error qq(No such op type "$arg");
		$arg = 0;
	    }
	}
    }
    return ($insn, $arg);
}

sub assemble_insn {
    my ($insn, $arg) = @_;
    my $data = $insn_data{$insn};
    if (defined($data)) {
	my ($bytecode, $putsub) = @{$data}[0, 1];
	my $argcode = &$putsub($arg);
	return chr($bytecode).$argcode;
    } else {
	error qq(no such instruction "$insn");
	return "";
    }
}

sub assemble_fh {
    my ($fh, $out) = @_;
    my $line;
    my $asm = newasm($out);
    while ($line = <$fh>) {
	assemble($line);
    }
    endasm();
}

sub newasm {
    my($outsub) = @_;

    die "Invalid printing routine for B::Assembler\n" unless ref $outsub eq 'CODE';
    die <<EOD if ref $out;
Can't have multiple byteassembly sessions at once!
	(perhaps you forgot an endasm()?)
EOD

    $linenum = $errors = 0;
    $out = $outsub;

    $out->(gen_header());
}

sub endasm {
    if ($errors) {
	die "There were $errors assembly errors\n";
    }
    $linenum = $errors = $out = 0;
}

sub assemble {
    my($line) = @_;
    my ($insn, $arg);
    $linenum++;
    chomp $line;
    if ($debug) {
	my $quotedline = $line;
	$quotedline =~ s/\\/\\\\/g;
	$quotedline =~ s/"/\\"/g;
	$out->(assemble_insn("comment", qq("$quotedline")));
    }
    if( $line = strip_comments($line) ){
        ($insn, $arg) = parse_statement($line);
        $out->(assemble_insn($insn, $arg));
        if ($debug) {
	    $out->(assemble_insn("nop", undef));
        }
    }
}

1;

__END__

=head1 NAME

B::Assembler - Assemble Perl bytecode

=head1 SYNOPSIS

	use B::Assembler qw(newasm endasm assemble);
	newasm(\&printsub);	# sets up for assembly
	assemble($buf); 	# assembles one line
	endasm();		# closes down

	use B::Assembler qw(assemble_fh);
	assemble_fh($fh, \&printsub);	# assemble everything in $fh

=head1 DESCRIPTION

See F<ext/B/B/Assembler.pm>.

=head1 AUTHORS

Malcolm Beattie, C<mbeattie@sable.ox.ac.uk>
Per-statement interface by Benjamin Stuhl, C<sho_pi@hotmail.com>

=cut
Commit	Line	Data
86530b38 AT	1	# Assembler.pm
	2	#
	3	# Copyright (c) 1996 Malcolm Beattie
	4	#
	5	# You may distribute under the terms of either the GNU General Public
	6	# License or the Artistic License, as specified in the README file.
	7
	8	package B::Assembler;
	9	use Exporter;
	10	use B qw(ppname);
	11	use B::Asmdata qw(%insn_data @insn_name);
	12	use Config qw(%Config);
	13	require ByteLoader; # we just need its $VERSIOM
	14
	15	@ISA = qw(Exporter);
	16	@EXPORT_OK = qw(assemble_fh newasm endasm assemble);
	17	$VERSION = 0.04;
	18
	19	use strict;
	20	my %opnumber;
	21	my ($i, $opname);
	22	for ($i = 0; defined($opname = ppname($i)); $i++) {
	23	$opnumber{$opname} = $i;
	24	}
	25
	26	my($linenum, $errors, $out); # global state, set up by newasm
	27
	28	sub error {
	29	my $str = shift;
	30	warn "$linenum: $str\n";
	31	$errors++;
	32	}
	33
	34	my $debug = 0;
	35	sub debug { $debug = shift }
	36
	37	sub limcheck($$$$){
	38	my( $val, $lo, $hi, $loc ) = @_;
	39	if( $val < $lo \|\| $hi < $val ){
	40	error "argument for $loc outside [$lo, $hi]: $val";
	41	$val = $hi;
	42	}
	43	return $val;
	44	}
	45
	46	#
	47	# First define all the data conversion subs to which Asmdata will refer
	48	#
	49
	50	sub B::Asmdata::PUT_U8 {
	51	my $arg = shift;
	52	my $c = uncstring($arg);
	53	if (defined($c)) {
	54	if (length($c) != 1) {
	55	error "argument for U8 is too long: $c";
	56	$c = substr($c, 0, 1);
	57	}
	58	} else {
	59	$arg = limcheck( $arg, 0, 0xff, 'U8' );
	60	$c = chr($arg);
	61	}
	62	return $c;
	63	}
	64
65	sub B::Asmdata::PUT_U16 {
66	my $arg = limcheck( $_[0], 0, 0xffff, 'U16' );
67	pack("S", $arg);
68	}
69	sub B::Asmdata::PUT_U32 {
70	my $arg = limcheck( $_[0], 0, 0xffffffff, 'U32' );
71	pack("L", $arg);
72	}
73	sub B::Asmdata::PUT_I32 {
74	my $arg = limcheck( $_[0], -0x80000000, 0x7fffffff, 'I32' );
75	pack("l", $arg);
76	}
77	sub B::Asmdata::PUT_NV { sprintf("%s\0", $_[0]) } # "%lf" looses precision and pack('d',...)
78	# may not even be portable between compilers
79	sub B::Asmdata::PUT_objindex { # could allow names here
80	my $arg = limcheck( $_[0], 0, 0xffffffff, '*index' );
81	pack("L", $arg);
82	}
83	sub B::Asmdata::PUT_svindex { &B::Asmdata::PUT_objindex }
84	sub B::Asmdata::PUT_opindex { &B::Asmdata::PUT_objindex }
85	sub B::Asmdata::PUT_pvindex { &B::Asmdata::PUT_objindex }
86
87	sub B::Asmdata::PUT_strconst {
88	my $arg = shift;
89	my $str = uncstring($arg);
90	if (!defined($str)) {
91	error "bad string constant: $arg";
92	$str = '';
93	}
94	if ($str =~ s/\0//g) {
95	error "string constant argument contains NUL: $arg";
96	$str = '';
97	}
98	return $str . "\0";
99	}
100
101	sub B::Asmdata::PUT_pvcontents {
102	my $arg = shift;
103	error "extraneous argument: $arg" if defined $arg;
104	return "";
105	}
106	sub B::Asmdata::PUT_PV {
107	my $arg = shift;
108	my $str = uncstring($arg);
109	if( ! defined($str) ){
110	error "bad string argument: $arg";
111	$str = '';
112	}
113	return pack("L", length($str)) . $str;
114	}
115	sub B::Asmdata::PUT_comment_t {
116	my $arg = shift;
117	$arg = uncstring($arg);
118	error "bad string argument: $arg" unless defined($arg);
119	if ($arg =~ s/\n//g) {
120	error "comment argument contains linefeed: $arg";
121	}
122	return $arg . "\n";
123	}
124	sub B::Asmdata::PUT_double { sprintf("%s\0", $_[0]) } # see PUT_NV above
125	sub B::Asmdata::PUT_none {
126	my $arg = shift;
127	error "extraneous argument: $arg" if defined $arg;
128	return "";
129	}
130	sub B::Asmdata::PUT_op_tr_array {
131	my $arg = shift;
132	my @ary = split(/\s,\s/, $arg);
133	if (@ary != 256) {
134	error "wrong number of arguments to op_tr_array";
135	@ary = (0) x 256;
136	}
137	return pack("S256", @ary);
138	}
139	# XXX Check this works
140	# Note: $arg >> 32 is a no-op on 32-bit systems
141	sub B::Asmdata::PUT_IV64 {
142	my $arg = shift;
143	return pack("LL", ($arg >> 16) >>16 , $arg & 0xffffffff);
144	}
145
146	sub B::Asmdata::PUT_IV {
147	$Config{ivsize} == 4 ? &B::Asmdata::PUT_I32 : &B::Asmdata::PUT_IV64;
148	}
149
150	my %unesc = (n => "\n", r => "\r", t => "\t", a => "\a",
151	b => "\b", f => "\f", v => "\013");
152
153	sub uncstring {
154	my $s = shift;
155	$s =~ s/^"// and $s =~ s/"$// or return undef;
156	$s =~ s/\\(\d\d\d\|.)/length($1) == 3 ? chr(oct($1)) : ($unesc{$1}\|\|$1)/eg;
157	return $s;
158	}
159
160	sub strip_comments {
161	my $stmt = shift;
162	# Comments only allowed in instructions which don't take string arguments
163	# Treat string as a single line so .* eats \n characters.
164	$stmt =~ s{
165	^\s* # Ignore leading whitespace
166	(
167	[^"]* # A double quote '"' indicates a string argument. If we
168	# find a double quote, the match fails and we strip nothing.
169	)
170	\s*\# # Any amount of whitespace plus the comment marker...
171	.*$ # ...which carries on to end-of-string.
172	}{$1}sx; # Keep only the instruction and optional argument.
173	return $stmt;
174	}
175
176	# create the ByteCode header: magic, archname, ByteLoader $VERSION, ivsize,
177	# ptrsize, byteorder
178	# nvtype is irrelevant (floats are stored as strings)
179	# byteorder is strconst not U32 because of varying size issues
180
181	sub gen_header {
182	my $header = "";
183
184	$header .= B::Asmdata::PUT_U32(0x43424c50); # 'PLBC'
185	$header .= B::Asmdata::PUT_strconst('"' . $Config{archname}. '"');
186	$header .= B::Asmdata::PUT_strconst(qq["$ByteLoader::VERSION"]);
187	$header .= B::Asmdata::PUT_U32($Config{ivsize});
188	$header .= B::Asmdata::PUT_U32($Config{ptrsize});
189	$header .= B::Asmdata::PUT_strconst(sprintf(qq["0x%s"], $Config{byteorder}));
190
191	$header;
192	}
193
194	sub parse_statement {
195	my $stmt = shift;
196	my ($insn, $arg) = $stmt =~ m{
197	^\s* # allow (but ignore) leading whitespace
198	(.*?) # Instruction continues up until...
199	(?: # ...an optional whitespace+argument group
200	\s+ # first whitespace.
201	(.*) # The argument is all the rest (newlines included).
202	)?$ # anchor at end-of-line
203	}sx;
204	if (defined($arg)) {
205	if ($arg =~ s/^0x(?=[0-9a-fA-F]+$)//) {
206	$arg = hex($arg);
207	} elsif ($arg =~ s/^0(?=[0-7]+$)//) {
208	$arg = oct($arg);
209	} elsif ($arg =~ /^pp_/) {
210	$arg =~ s/\s*$//; # strip trailing whitespace
211	my $opnum = $opnumber{$arg};
212	if (defined($opnum)) {
213	$arg = $opnum;
214	} else {
215	error qq(No such op type "$arg");
216	$arg = 0;
217	}
218	}
219	}
220	return ($insn, $arg);
221	}
222
223	sub assemble_insn {
224	my ($insn, $arg) = @_;
225	my $data = $insn_data{$insn};
226	if (defined($data)) {
227	my ($bytecode, $putsub) = @{$data}[0, 1];
228	my $argcode = &$putsub($arg);
229	return chr($bytecode).$argcode;
230	} else {
231	error qq(no such instruction "$insn");
232	return "";
233	}
234	}
235
236	sub assemble_fh {
237	my ($fh, $out) = @_;
238	my $line;
239	my $asm = newasm($out);
240	while ($line = <$fh>) {
241	assemble($line);
242	}
243	endasm();
244	}
245
246	sub newasm {
247	my($outsub) = @_;
248
249	die "Invalid printing routine for B::Assembler\n" unless ref $outsub eq 'CODE';
250	die <<EOD if ref $out;
251	Can't have multiple byteassembly sessions at once!
252	(perhaps you forgot an endasm()?)
253	EOD
254
255	$linenum = $errors = 0;
256	$out = $outsub;
257
258	$out->(gen_header());
259	}
260
261	sub endasm {
262	if ($errors) {
263	die "There were $errors assembly errors\n";
264	}
265	$linenum = $errors = $out = 0;
266	}
267
268	sub assemble {
269	my($line) = @_;
270	my ($insn, $arg);
271	$linenum++;
272	chomp $line;
273	if ($debug) {
274	my $quotedline = $line;
275	$quotedline =~ s/\\/\\\\/g;
276	$quotedline =~ s/"/\\"/g;
277	$out->(assemble_insn("comment", qq("$quotedline")));
278	}
279	if( $line = strip_comments($line) ){
280	($insn, $arg) = parse_statement($line);
281	$out->(assemble_insn($insn, $arg));
282	if ($debug) {
283	$out->(assemble_insn("nop", undef));
284	}
285	}
286	}
287
288	1;
289
290	__END__
291
292	=head1 NAME
293
294	B::Assembler - Assemble Perl bytecode
295
296	=head1 SYNOPSIS
297
298	use B::Assembler qw(newasm endasm assemble);
299	newasm(\&printsub); # sets up for assembly
300	assemble($buf); # assembles one line
301	endasm(); # closes down
302
303	use B::Assembler qw(assemble_fh);
304	assemble_fh($fh, \&printsub); # assemble everything in $fh
305
306	=head1 DESCRIPTION
307
308	See F<ext/B/B/Assembler.pm>.
309
310	=head1 AUTHORS
311
312	Malcolm Beattie, C<mbeattie@sable.ox.ac.uk>
313	Per-statement interface by Benjamin Stuhl, C<sho_pi@hotmail.com>
314
315	=cut