[perl5.git] / regen / opcode.pl

#!/usr/bin/perl -w
# 
# Regenerate (overwriting only if changed):
#
#    opcode.h
#    opnames.h
#    pp_proto.h
#
# from information stored in regen/opcodes, plus the
# values hardcoded into this script in @raw_alias.
#
# Accepts the standard regen_lib -q and -v args.
#
# This script is normally invoked from regen.pl.

use strict;

BEGIN {
    # Get function prototypes
    require 'regen/regen_lib.pl';
}

my $oc = safer_open('opcode.h-new', 'opcode.h');
my $on = safer_open('opnames.h-new', 'opnames.h');

# Read data.

my %seen;
my (@ops, %desc, %check, %ckname, %flags, %args, %opnum);

open OPS, 'regen/opcodes' or die $!;

while (<OPS>) {
    chop;
    next unless $_;
    next if /^#/;
    my ($key, $desc, $check, $flags, $args) = split(/\t+/, $_, 5);
    $args = '' unless defined $args;

    warn qq[Description "$desc" duplicates $seen{$desc}\n]
     if $seen{$desc} and $key ne "transr";
    die qq[Opcode "$key" duplicates $seen{$key}\n] if $seen{$key};
    $seen{$desc} = qq[description of opcode "$key"];
    $seen{$key} = qq[opcode "$key"];

    push(@ops, $key);
    $opnum{$key} = $#ops;
    $desc{$key} = $desc;
    $check{$key} = $check;
    $ckname{$check}++;
    $flags{$key} = $flags;
    $args{$key} = $args;
}

# Set up aliases

my %alias;

# Format is "this function" => "does these op names"
my @raw_alias = (
		 Perl_do_kv => [qw( keys values )],
		 Perl_unimplemented_op => [qw(padany mapstart custom)],
		 # All the ops with a body of { return NORMAL; }
		 Perl_pp_null => [qw(scalar regcmaybe lineseq scope)],

		 Perl_pp_goto => ['dump'],
		 Perl_pp_require => ['dofile'],
		 Perl_pp_untie => ['dbmclose'],
		 Perl_pp_sysread => {read => '', recv => '#ifdef HAS_SOCKET'},
		 Perl_pp_sysseek => ['seek'],
		 Perl_pp_ioctl => ['fcntl'],
		 Perl_pp_ssockopt => {gsockopt => '#ifdef HAS_SOCKET'},
		 Perl_pp_getpeername => {getsockname => '#ifdef HAS_SOCKET'},
		 Perl_pp_stat => ['lstat'],
		 Perl_pp_ftrowned => [qw(fteowned ftzero ftsock ftchr ftblk
					 ftfile ftdir ftpipe ftsuid ftsgid
 					 ftsvtx)],
		 Perl_pp_fttext => ['ftbinary'],
		 Perl_pp_gmtime => ['localtime'],
		 Perl_pp_semget => [qw(shmget msgget)],
		 Perl_pp_semctl => [qw(shmctl msgctl)],
		 Perl_pp_ghostent => [qw(ghbyname ghbyaddr)],
		 Perl_pp_gnetent => [qw(gnbyname gnbyaddr)],
		 Perl_pp_gprotoent => [qw(gpbyname gpbynumber)],
		 Perl_pp_gservent => [qw(gsbyname gsbyport)],
		 Perl_pp_gpwent => [qw(gpwnam gpwuid)],
		 Perl_pp_ggrent => [qw(ggrnam ggrgid)],
		 Perl_pp_ftis => [qw(ftsize ftmtime ftatime ftctime)],
		 Perl_pp_chown => [qw(unlink chmod utime kill)],
		 Perl_pp_link => ['symlink'],
		 Perl_pp_ftrread => [qw(ftrwrite ftrexec fteread ftewrite
 					fteexec)],
		 Perl_pp_shmwrite => [qw(shmread msgsnd msgrcv semop)],
		 Perl_pp_syswrite => {send => '#ifdef HAS_SOCKET'},
		 Perl_pp_defined => [qw(dor dorassign)],
                 Perl_pp_and => ['andassign'],
		 Perl_pp_or => ['orassign'],
		 Perl_pp_ucfirst => ['lcfirst'],
		 Perl_pp_sle => [qw(slt sgt sge)],
		 Perl_pp_print => ['say'],
		 Perl_pp_index => ['rindex'],
		 Perl_pp_oct => ['hex'],
		 Perl_pp_shift => ['pop'],
		 Perl_pp_sin => [qw(cos exp log sqrt)],
		 Perl_pp_bit_or => ['bit_xor'],
		 Perl_pp_rv2av => ['rv2hv'],
		 Perl_pp_akeys => ['avalues'],
		 Perl_pp_rkeys => [qw(rvalues reach)],
		 Perl_pp_trans => [qw(trans transr)],
		 Perl_pp_chop => [qw(chop chomp)],
		 Perl_pp_schop => [qw(schop schomp)],
		 Perl_pp_bind => {connect => '#ifdef HAS_SOCKET'},
		 Perl_pp_preinc => ['i_preinc'],
		 Perl_pp_predec => ['i_predec'],
		 Perl_pp_postinc => ['i_postinc'],
		 Perl_pp_postdec => ['i_postdec'],
		 Perl_pp_ehostent => [qw(enetent eprotoent eservent
					 spwent epwent sgrent egrent)],
		 Perl_pp_shostent => [qw(snetent sprotoent sservent)],
		);

while (my ($func, $names) = splice @raw_alias, 0, 2) {
    if (ref $names eq 'ARRAY') {
	foreach (@$names) {
	    $alias{$_} = [$func, ''];
	}
    } else {
	while (my ($opname, $cond) = each %$names) {
	    $alias{$opname} = [$func, $cond];
	}
    }
}

foreach my $sock_func (qw(socket bind listen accept shutdown
			  ssockopt getpeername)) {
    $alias{$sock_func} = ["Perl_pp_$sock_func", '#ifdef HAS_SOCKET'],
}

# Emit defines.

print $oc read_only_top(lang => 'C', by => 'regen/opcode.pl', from => 'its data',
			file => 'opcode.h', style => '*',
			copyright => [1993 .. 2007]),
    "#ifndef PERL_GLOBAL_STRUCT_INIT\n\n";

{
    my $last_cond = '';
    my @unimplemented;

    sub unimplemented {
	if (@unimplemented) {
	    print $oc "#else\n";
	    foreach (@unimplemented) {
		print $oc "#define $_ Perl_unimplemented_op\n";
	    }
	    print $oc "#endif\n";
	    @unimplemented = ();
	}

    }

    for (@ops) {
	my ($impl, $cond) = @{$alias{$_} || ["Perl_pp_$_", '']};
	my $op_func = "Perl_pp_$_";

	if ($cond ne $last_cond) {
	    # A change in condition. (including to or from no condition)
	    unimplemented();
	    $last_cond = $cond;
	    if ($last_cond) {
		print $oc "$last_cond\n";
	    }
	}
	push @unimplemented, $op_func if $last_cond;
	print $oc "#define $op_func $impl\n" if $impl ne $op_func;
    }
    # If the last op was conditional, we need to close it out:
    unimplemented();
}

print $on read_only_top(lang => 'C', by => 'regen/opcode.pl',
			from => 'its data', style => '*',
			file => 'opnames.h', copyright => [1999 .. 2008]),
    "typedef enum opcode {\n";

my $i = 0;
for (@ops) {
      print $on "\t", tab(3,"OP_\U$_"), " = ", $i++, ",\n";
}
print $on "\t", tab(3,"OP_max"), "\n";
print $on "} opcode;\n";
print $on "\n#define MAXO ", scalar @ops, "\n";

# Emit op names and descriptions.

print $oc <<'END';
START_EXTERN_C

#ifndef DOINIT
EXTCONST char* const PL_op_name[];
#else
EXTCONST char* const PL_op_name[] = {
END

for (@ops) {
    print $oc qq(\t"$_",\n);
}

print $oc <<'END';
};
#endif

#ifndef DOINIT
EXTCONST char* const PL_op_desc[];
#else
EXTCONST char* const PL_op_desc[] = {
END

for (@ops) {
    my($safe_desc) = $desc{$_};

    # Have to escape double quotes and escape characters.
    $safe_desc =~ s/([\\"])/\\$1/g;

    print $oc qq(\t"$safe_desc",\n);
}

print $oc <<'END';
};
#endif

END_EXTERN_C

#endif /* !PERL_GLOBAL_STRUCT_INIT */
END

# Emit ppcode switch array.

print $oc <<'END';

START_EXTERN_C

#ifdef PERL_GLOBAL_STRUCT_INIT
#  define PERL_PPADDR_INITED
static const Perl_ppaddr_t Gppaddr[]
#else
#  ifndef PERL_GLOBAL_STRUCT
#    define PERL_PPADDR_INITED
EXT Perl_ppaddr_t PL_ppaddr[] /* or perlvars.h */
#  endif
#endif /* PERL_GLOBAL_STRUCT */
#if (defined(DOINIT) && !defined(PERL_GLOBAL_STRUCT)) || defined(PERL_GLOBAL_STRUCT_INIT)
#  define PERL_PPADDR_INITED
= {
END

for (@ops) {
    my $op_func = "Perl_pp_$_";
    my $name = $alias{$_};
    if ($name && $name->[0] ne $op_func) {
	print $oc "\t$op_func,\t/* implemented by $name->[0] */\n";
    }
    else {
	print $oc "\t$op_func,\n";
    }
}

print $oc <<'END';
}
#endif
#ifdef PERL_PPADDR_INITED
;
#endif

#ifdef PERL_GLOBAL_STRUCT_INIT
#  define PERL_CHECK_INITED
static const Perl_check_t Gcheck[]
#else
#  ifndef PERL_GLOBAL_STRUCT
#    define PERL_CHECK_INITED
EXT Perl_check_t PL_check[] /* or perlvars.h */
#  endif
#endif
#if (defined(DOINIT) && !defined(PERL_GLOBAL_STRUCT)) || defined(PERL_GLOBAL_STRUCT_INIT)
#  define PERL_CHECK_INITED
= {
END

for (@ops) {
    print $oc "\t", tab(3, "Perl_$check{$_},"), "\t/* $_ */\n";
}

print $oc <<'END';
}
#endif
#ifdef PERL_CHECK_INITED
;
#endif /* #ifdef PERL_CHECK_INITED */

#ifndef PERL_GLOBAL_STRUCT_INIT

#ifndef DOINIT
EXTCONST U32 PL_opargs[];
#else
EXTCONST U32 PL_opargs[] = {
END

# Emit allowed argument types.

my $ARGBITS = 32;

my %argnum = (
    'S',  1,		# scalar
    'L',  2,		# list
    'A',  3,		# array value
    'H',  4,		# hash value
    'C',  5,		# code value
    'F',  6,		# file value
    'R',  7,		# scalar reference
);

my %opclass = (
    '0',  0,		# baseop
    '1',  1,		# unop
    '2',  2,		# binop
    '|',  3,		# logop
    '@',  4,		# listop
    '/',  5,		# pmop
    '$',  6,		# svop_or_padop
    '#',  7,		# padop
    '"',  8,		# pvop_or_svop
    '{',  9,		# loop
    ';',  10,		# cop
    '%',  11,		# baseop_or_unop
    '-',  12,		# filestatop
    '}',  13,		# loopexop
);

my %opflags = (
    'm' =>   1,		# needs stack mark
    'f' =>   2,		# fold constants
    's' =>   4,		# always produces scalar
    't' =>   8,		# needs target scalar
    'T' =>   8 | 16,	# ... which may be lexical
    'i' =>   0,		# always produces integer (unused since e7311069)
    'I' =>  32,		# has corresponding int op
    'd' =>  64,		# danger, unknown side effects
    'u' => 128,		# defaults to $_
);

my %OP_IS_SOCKET;
my %OP_IS_FILETEST;
my %OP_IS_FT_ACCESS;
my $OCSHIFT = 8;
my $OASHIFT = 12;

for my $op (@ops) {
    my $argsum = 0;
    my $flags = $flags{$op};
    for my $flag (keys %opflags) {
	if ($flags =~ s/$flag//) {
	    die "Flag collision for '$op' ($flags{$op}, $flag)\n"
		if $argsum & $opflags{$flag};
	    $argsum |= $opflags{$flag};
	}
    }
    die qq[Opcode '$op' has no class indicator ($flags{$op} => $flags)\n]
	unless exists $opclass{$flags};
    $argsum |= $opclass{$flags} << $OCSHIFT;
    my $argshift = $OASHIFT;
    for my $arg (split(' ',$args{$op})) {
	if ($arg =~ /^F/) {
	    # record opnums of these opnames
	    $OP_IS_SOCKET{$op}   = $opnum{$op} if $arg =~ s/s//;
	    $OP_IS_FILETEST{$op} = $opnum{$op} if $arg =~ s/-//;
	    $OP_IS_FT_ACCESS{$op} = $opnum{$op} if $arg =~ s/\+//;
        }
	my $argnum = ($arg =~ s/\?//) ? 8 : 0;
        die "op = $op, arg = $arg\n"
	    unless exists $argnum{$arg};
	$argnum += $argnum{$arg};
	die "Argument overflow for '$op'\n"
	    if $argshift >= $ARGBITS ||
	       $argnum > ((1 << ($ARGBITS - $argshift)) - 1);
	$argsum += $argnum << $argshift;
	$argshift += 4;
    }
    $argsum = sprintf("0x%08x", $argsum);
    print $oc "\t", tab(3, "$argsum,"), "/* $op */\n";
}

print $oc <<'END';
};
#endif

#endif /* !PERL_GLOBAL_STRUCT_INIT */

END_EXTERN_C
END

# Emit OP_IS_* macros

print $on <<'EO_OP_IS_COMMENT';

/* the OP_IS_(SOCKET|FILETEST) macros are optimized to a simple range
    check because all the member OPs are contiguous in opcode.pl
    <OPS> table.  opcode.pl verifies the range contiguity.  */
EO_OP_IS_COMMENT

gen_op_is_macro( \%OP_IS_SOCKET, 'OP_IS_SOCKET');
gen_op_is_macro( \%OP_IS_FILETEST, 'OP_IS_FILETEST');
gen_op_is_macro( \%OP_IS_FT_ACCESS, 'OP_IS_FILETEST_ACCESS');

sub gen_op_is_macro {
    my ($op_is, $macname) = @_;
    if (keys %$op_is) {
	
	# get opnames whose numbers are lowest and highest
	my ($first, @rest) = sort {
	    $op_is->{$a} <=> $op_is->{$b}
	} keys %$op_is;
	
	my $last = pop @rest;	# @rest slurped, get its last
	die "Invalid range of ops: $first .. $last\n" unless $last;

	print $on "\n#define $macname(op)	\\\n\t(";

	# verify that op-ct matches 1st..last range (and fencepost)
	# (we know there are no dups)
	if ( $op_is->{$last} - $op_is->{$first} == scalar @rest + 1) {
	    
	    # contiguous ops -> optimized version
	    print $on "(op) >= OP_" . uc($first) . " && (op) <= OP_" . uc($last);
	    print $on ")\n";
	}
	else {
	    print $on join(" || \\\n\t ",
			  map { "(op) == OP_" . uc() } sort keys %$op_is);
	    print $on ")\n";
	}
    }
}

my $pp = safer_open('pp_proto.h-new', 'pp_proto.h');

print $pp read_only_top(lang => 'C', by => 'opcode.pl', from => 'its data');

{
    my %funcs;
    for (@ops) {
	my $name = $alias{$_} ? $alias{$_}[0] : "Perl_pp_$_";
	++$funcs{$name};
    }
    print $pp "PERL_CALLCONV OP *$_(pTHX);\n" foreach sort keys %funcs;
}
foreach ($oc, $on, $pp) {
    read_only_bottom_close_and_rename($_);
}

# Some comments about 'T' opcode classifier:

# Safe to set if the ppcode uses:
#	tryAMAGICbin, tryAMAGICun, SETn, SETi, SETu, PUSHn, PUSHTARG, SETTARG,
#	SETs(TARG), XPUSHn, XPUSHu,

# Unsafe to set if the ppcode uses dTARG or [X]RETPUSH[YES|NO|UNDEF]

# lt and friends do SETs (including ncmp, but not scmp)

# Additional mode of failure: the opcode can modify TARG before it "used"
# all the arguments (or may call an external function which does the same).
# If the target coincides with one of the arguments ==> kaboom.

# pp.c	pos substr each not OK (RETPUSHUNDEF)
#	substr vec also not OK due to LV to target (are they???)
#	ref not OK (RETPUSHNO)
#	trans not OK (dTARG; TARG = sv_newmortal();)
#	ucfirst etc not OK: TMP arg processed inplace
#	quotemeta not OK (unsafe when TARG == arg)
#	each repeat not OK too due to list context
#	pack split - unknown whether they are safe
#	sprintf: is calling do_sprintf(TARG,...) which can act on TARG
#	  before other args are processed.

#	Suspicious wrt "additional mode of failure" (and only it):
#	schop, chop, postinc/dec, bit_and etc, negate, complement.

#	Also suspicious: 4-arg substr, sprintf, uc/lc (POK_only), reverse, pack.

#	substr/vec: doing TAINT_off()???

# pp_hot.c
#	readline - unknown whether it is safe
#	match subst not OK (dTARG)
#	grepwhile not OK (not always setting)
#	join not OK (unsafe when TARG == arg)

#	Suspicious wrt "additional mode of failure": concat (dealt with
#	in ck_sassign()), join (same).

# pp_ctl.c
#	mapwhile flip caller not OK (not always setting)

# pp_sys.c
#	backtick glob warn die not OK (not always setting)
#	warn not OK (RETPUSHYES)
#	open fileno getc sysread syswrite ioctl accept shutdown
#	 ftsize(etc) readlink telldir fork alarm getlogin not OK (RETPUSHUNDEF)
#	umask select not OK (XPUSHs(&PL_sv_undef);)
#	fileno getc sysread syswrite tell not OK (meth("FILENO" "GETC"))
#	sselect shm* sem* msg* syscall - unknown whether they are safe
#	gmtime not OK (list context)

#	Suspicious wrt "additional mode of failure": warn, die, select.
Commit	Line	Data
d6480c9d	1	#!/usr/bin/perl -w
6294c161 DM	2	#
	3	# Regenerate (overwriting only if changed):
	4	#
	5	# opcode.h
	6	# opnames.h
897d3989	7	# pp_proto.h
6294c161	8	#
f8a58b02	9	# from information stored in regen/opcodes, plus the
6294c161 DM	10	# values hardcoded into this script in @raw_alias.
	11	#
	12	# Accepts the standard regen_lib -q and -v args.
	13	#
	14	# This script is normally invoked from regen.pl.
	15
d6480c9d NC	16	use strict;
d6480c9d NC	17
36bb303b NC	18	BEGIN {
36bb303b NC	19	# Get function prototypes
af001346	20	require 'regen/regen_lib.pl';
36bb303b	21	}
79072805	22
f038801a NC	23	my $oc = safer_open('opcode.h-new', 'opcode.h');
f038801a NC	24	my $on = safer_open('opnames.h-new', 'opnames.h');
79072805 LW	25
	26	# Read data.
	27
d6480c9d	28	my %seen;
e71197e2	29	my (@ops, %desc, %check, %ckname, %flags, %args, %opnum);
d6480c9d	30
f8a58b02 NC	31	open OPS, 'regen/opcodes' or die $!;
	32
	33	while (<OPS>) {
79072805 LW	34	chop;
	35	next unless $_;
	36	next if /^#/;
d6480c9d NC	37	my ($key, $desc, $check, $flags, $args) = split(/\t+/, $_, 5);
d6480c9d NC	38	$args = '' unless defined $args;
c07a80fd	39
6342d5c5 FC	40	warn qq[Description "$desc" duplicates $seen{$desc}\n]
6342d5c5 FC	41	if $seen{$desc} and $key ne "transr";
c07a80fd	42	die qq[Opcode "$key" duplicates $seen{$key}\n] if $seen{$key};
	43	$seen{$desc} = qq[description of opcode "$key"];
	44	$seen{$key} = qq[opcode "$key"];
	45
79072805	46	push(@ops, $key);
e71197e2	47	$opnum{$key} = $#ops;
c07a80fd	48	$desc{$key} = $desc;
79072805 LW	49	$check{$key} = $check;
	50	$ckname{$check}++;
	51	$flags{$key} = $flags;
	52	$args{$key} = $args;
	53	}
	54
1d5774de NC	55	# Set up aliases
	56
	57	my %alias;
	58
	59	# Format is "this function" => "does these op names"
	60	my @raw_alias = (
6faeeb49	61	Perl_do_kv => [qw( keys values )],
d83386fa	62	Perl_unimplemented_op => [qw(padany mapstart custom)],
0b612f93 NC	63	# All the ops with a body of { return NORMAL; }
	64	Perl_pp_null => [qw(scalar regcmaybe lineseq scope)],
	65
	66	Perl_pp_goto => ['dump'],
	67	Perl_pp_require => ['dofile'],
	68	Perl_pp_untie => ['dbmclose'],
7627e6d0	69	Perl_pp_sysread => {read => '', recv => '#ifdef HAS_SOCKET'},
0b612f93 NC	70	Perl_pp_sysseek => ['seek'],
0b612f93 NC	71	Perl_pp_ioctl => ['fcntl'],
7627e6d0 NC	72	Perl_pp_ssockopt => {gsockopt => '#ifdef HAS_SOCKET'},
7627e6d0 NC	73	Perl_pp_getpeername => {getsockname => '#ifdef HAS_SOCKET'},
0b612f93	74	Perl_pp_stat => ['lstat'],
f1cb2d48	75	Perl_pp_ftrowned => [qw(fteowned ftzero ftsock ftchr ftblk
17ad201a NC	76	ftfile ftdir ftpipe ftsuid ftsgid
17ad201a NC	77	ftsvtx)],
0b612f93 NC	78	Perl_pp_fttext => ['ftbinary'],
	79	Perl_pp_gmtime => ['localtime'],
	80	Perl_pp_semget => [qw(shmget msgget)],
	81	Perl_pp_semctl => [qw(shmctl msgctl)],
0b612f93 NC	82	Perl_pp_ghostent => [qw(ghbyname ghbyaddr)],
	83	Perl_pp_gnetent => [qw(gnbyname gnbyaddr)],
	84	Perl_pp_gprotoent => [qw(gpbyname gpbynumber)],
	85	Perl_pp_gservent => [qw(gsbyname gsbyport)],
	86	Perl_pp_gpwent => [qw(gpwnam gpwuid)],
	87	Perl_pp_ggrent => [qw(ggrnam ggrgid)],
957b0e1d	88	Perl_pp_ftis => [qw(ftsize ftmtime ftatime ftctime)],
605b9385	89	Perl_pp_chown => [qw(unlink chmod utime kill)],
ce6987d0	90	Perl_pp_link => ['symlink'],
af9e49b4 NC	91	Perl_pp_ftrread => [qw(ftrwrite ftrexec fteread ftewrite
af9e49b4 NC	92	fteexec)],
ca563b4e	93	Perl_pp_shmwrite => [qw(shmread msgsnd msgrcv semop)],
7627e6d0	94	Perl_pp_syswrite => {send => '#ifdef HAS_SOCKET'},
c960fc3b	95	Perl_pp_defined => [qw(dor dorassign)],
62726f23 SP	96	Perl_pp_and => ['andassign'],
62726f23 SP	97	Perl_pp_or => ['orassign'],
12e9c124	98	Perl_pp_ucfirst => ['lcfirst'],
afd9910b	99	Perl_pp_sle => [qw(slt sgt sge)],
0d863452	100	Perl_pp_print => ['say'],
2723d216	101	Perl_pp_index => ['rindex'],
daa2adfd	102	Perl_pp_oct => ['hex'],
789b4bc9	103	Perl_pp_shift => ['pop'],
71302fe3	104	Perl_pp_sin => [qw(cos exp log sqrt)],
3658c1f1	105	Perl_pp_bit_or => ['bit_xor'],
17ab7946	106	Perl_pp_rv2av => ['rv2hv'],
878d132a	107	Perl_pp_akeys => ['avalues'],
cba5a3b0	108	Perl_pp_rkeys => [qw(rvalues reach)],
7627e6d0 NC	109	Perl_pp_trans => [qw(trans transr)],
	110	Perl_pp_chop => [qw(chop chomp)],
	111	Perl_pp_schop => [qw(schop schomp)],
	112	Perl_pp_bind => {connect => '#ifdef HAS_SOCKET'},
9561d06f NC	113	Perl_pp_preinc => ['i_preinc'],
	114	Perl_pp_predec => ['i_predec'],
	115	Perl_pp_postinc => ['i_postinc'],
	116	Perl_pp_postdec => ['i_postdec'],
720d5dbf NC	117	Perl_pp_ehostent => [qw(enetent eprotoent eservent
720d5dbf NC	118	spwent epwent sgrent egrent)],
396166e1	119	Perl_pp_shostent => [qw(snetent sprotoent sservent)],
605b9385	120	);
1d5774de NC	121
1d5774de NC	122	while (my ($func, $names) = splice @raw_alias, 0, 2) {
7627e6d0 NC	123	if (ref $names eq 'ARRAY') {
	124	foreach (@$names) {
	125	$alias{$_} = [$func, ''];
	126	}
	127	} else {
	128	while (my ($opname, $cond) = each %$names) {
	129	$alias{$opname} = [$func, $cond];
	130	}
916e4025	131	}
1d5774de NC	132	}
1d5774de NC	133
7627e6d0 NC	134	foreach my $sock_func (qw(socket bind listen accept shutdown
	135	ssockopt getpeername)) {
	136	$alias{$sock_func} = ["Perl_pp_$sock_func", '#ifdef HAS_SOCKET'],
	137	}
	138
79072805 LW	139	# Emit defines.
79072805 LW	140
2d6469fe NC	141	print $oc read_only_top(lang => 'C', by => 'regen/opcode.pl', from => 'its data',
	142	file => 'opcode.h', style => '*',
	143	copyright => [1993 .. 2007]),
78102347	144	"#ifndef PERL_GLOBAL_STRUCT_INIT\n\n";
9561d06f	145
7627e6d0 NC	146	{
	147	my $last_cond = '';
	148	my @unimplemented;
	149
	150	sub unimplemented {
	151	if (@unimplemented) {
2d6469fe	152	print $oc "#else\n";
7627e6d0	153	foreach (@unimplemented) {
2d6469fe	154	print $oc "#define $_ Perl_unimplemented_op\n";
7627e6d0	155	}
2d6469fe	156	print $oc "#endif\n";
7627e6d0 NC	157	@unimplemented = ();
	158	}
	159
	160	}
	161
	162	for (@ops) {
	163	my ($impl, $cond) = @{$alias{$_} \|\| ["Perl_pp_$_", '']};
	164	my $op_func = "Perl_pp_$_";
	165
	166	if ($cond ne $last_cond) {
	167	# A change in condition. (including to or from no condition)
	168	unimplemented();
	169	$last_cond = $cond;
	170	if ($last_cond) {
2d6469fe	171	print $oc "$last_cond\n";
7627e6d0 NC	172	}
	173	}
	174	push @unimplemented, $op_func if $last_cond;
2d6469fe	175	print $oc "#define $op_func $impl\n" if $impl ne $op_func;
7627e6d0 NC	176	}
	177	# If the last op was conditional, we need to close it out:
	178	unimplemented();
9561d06f NC	179	}
9561d06f NC	180
78102347 NC	181	print $on read_only_top(lang => 'C', by => 'regen/opcode.pl',
	182	from => 'its data', style => '*',
	183	file => 'opnames.h', copyright => [1999 .. 2008]),
	184	"typedef enum opcode {\n";
abdd5c84	185
d6480c9d	186	my $i = 0;
79072805	187	for (@ops) {
2d6469fe	188	print $on "\t", tab(3,"OP_\U$_"), " = ", $i++, ",\n";
79072805	189	}
2d6469fe	190	print $on "\t", tab(3,"OP_max"), "\n";
424a4936 NC	191	print $on "} opcode;\n";
424a4936 NC	192	print $on "\n#define MAXO ", scalar @ops, "\n";
79072805	193
c07a80fd	194	# Emit op names and descriptions.
79072805	195
2d6469fe	196	print $oc <<'END';
73c4f7a1 GS	197	START_EXTERN_C
73c4f7a1 GS	198
79072805	199	#ifndef DOINIT
27da23d5	200	EXTCONST char* const PL_op_name[];
79072805	201	#else
27da23d5	202	EXTCONST char* const PL_op_name[] = {
79072805 LW	203	END
	204
	205	for (@ops) {
2d6469fe	206	print $oc qq(\t"$_",\n);
c07a80fd	207	}
c07a80fd	208
2d6469fe	209	print $oc <<'END';
c07a80fd	210	};
	211	#endif
	212
c07a80fd	213	#ifndef DOINIT
27da23d5	214	EXTCONST char* const PL_op_desc[];
c07a80fd	215	#else
27da23d5	216	EXTCONST char* const PL_op_desc[] = {
c07a80fd	217	END
	218
	219	for (@ops) {
42d38218 MS	220	my($safe_desc) = $desc{$_};
42d38218 MS	221
a567e93b	222	# Have to escape double quotes and escape characters.
b0c6325e	223	$safe_desc =~ s/([\\"])/\\$1/g;
42d38218	224
2d6469fe	225	print $oc qq(\t"$safe_desc",\n);
79072805 LW	226	}
79072805 LW	227
2d6469fe	228	print $oc <<'END';
79072805 LW	229	};
	230	#endif
	231
73c4f7a1 GS	232	END_EXTERN_C
73c4f7a1 GS	233
27da23d5	234	#endif /* !PERL_GLOBAL_STRUCT_INIT */
22c35a8c	235	END
79072805	236
79072805 LW	237	# Emit ppcode switch array.
79072805 LW	238
2d6469fe	239	print $oc <<'END';
79072805	240
73c4f7a1 GS	241	START_EXTERN_C
73c4f7a1 GS	242
27da23d5	243	#ifdef PERL_GLOBAL_STRUCT_INIT
97aff369	244	# define PERL_PPADDR_INITED
27da23d5	245	static const Perl_ppaddr_t Gppaddr[]
79072805	246	#else
27da23d5	247	# ifndef PERL_GLOBAL_STRUCT
97aff369	248	# define PERL_PPADDR_INITED
27da23d5 JH	249	EXT Perl_ppaddr_t PL_ppaddr[] /* or perlvars.h */
	250	# endif
	251	#endif /* PERL_GLOBAL_STRUCT */
	252	#if (defined(DOINIT) && !defined(PERL_GLOBAL_STRUCT)) \|\| defined(PERL_GLOBAL_STRUCT_INIT)
97aff369	253	# define PERL_PPADDR_INITED
27da23d5	254	= {
79072805 LW	255	END
	256
	257	for (@ops) {
7627e6d0 NC	258	my $op_func = "Perl_pp_$_";
	259	my $name = $alias{$_};
	260	if ($name && $name->[0] ne $op_func) {
2d6469fe	261	print $oc "\t$op_func,\t/* implemented by $name->[0] */\n";
6faeeb49 MB	262	}
6faeeb49 MB	263	else {
2d6469fe	264	print $oc "\t$op_func,\n";
6faeeb49	265	}
79072805 LW	266	}
79072805 LW	267
2d6469fe	268	print $oc <<'END';
27da23d5	269	}
79072805	270	#endif
97aff369	271	#ifdef PERL_PPADDR_INITED
27da23d5	272	;
97aff369	273	#endif
79072805	274
27da23d5	275	#ifdef PERL_GLOBAL_STRUCT_INIT
97aff369	276	# define PERL_CHECK_INITED
27da23d5	277	static const Perl_check_t Gcheck[]
79072805	278	#else
27da23d5	279	# ifndef PERL_GLOBAL_STRUCT
97aff369	280	# define PERL_CHECK_INITED
27da23d5 JH	281	EXT Perl_check_t PL_check[] /* or perlvars.h */
	282	# endif
	283	#endif
	284	#if (defined(DOINIT) && !defined(PERL_GLOBAL_STRUCT)) \|\| defined(PERL_GLOBAL_STRUCT_INIT)
97aff369	285	# define PERL_CHECK_INITED
27da23d5	286	= {
79072805 LW	287	END
	288
	289	for (@ops) {
2d6469fe	290	print $oc "\t", tab(3, "Perl_$check{$_},"), "\t/* $_ */\n";
79072805 LW	291	}
79072805 LW	292
2d6469fe	293	print $oc <<'END';
27da23d5	294	}
79072805	295	#endif
97aff369	296	#ifdef PERL_CHECK_INITED
27da23d5	297	;
97aff369	298	#endif /* #ifdef PERL_CHECK_INITED */
79072805	299
27da23d5 JH	300	#ifndef PERL_GLOBAL_STRUCT_INIT
27da23d5 JH	301
79072805	302	#ifndef DOINIT
1ccb7c8d	303	EXTCONST U32 PL_opargs[];
79072805	304	#else
1ccb7c8d	305	EXTCONST U32 PL_opargs[] = {
79072805 LW	306	END
79072805 LW	307
2d6469fe NC	308	# Emit allowed argument types.
	309
	310	my $ARGBITS = 32;
	311
d6480c9d NC	312	my %argnum = (
	313	'S', 1, # scalar
	314	'L', 2, # list
	315	'A', 3, # array value
	316	'H', 4, # hash value
	317	'C', 5, # code value
	318	'F', 6, # file value
	319	'R', 7, # scalar reference
79072805 LW	320	);
79072805 LW	321
d6480c9d	322	my %opclass = (
db173bac MB	323	'0', 0, # baseop
	324	'1', 1, # unop
	325	'2', 2, # binop
	326	'\|', 3, # logop
1a67a97c SM	327	'@', 4, # listop
1a67a97c SM	328	'/', 5, # pmop
350de78d	329	'$', 6, # svop_or_padop
7934575e	330	'#', 7, # padop
1a67a97c SM	331	'"', 8, # pvop_or_svop
	332	'{', 9, # loop
	333	';', 10, # cop
	334	'%', 11, # baseop_or_unop
	335	'-', 12, # filestatop
	336	'}', 13, # loopexop
db173bac MB	337	);
db173bac MB	338
c2dedb93 MHM	339	my %opflags = (
	340	'm' => 1, # needs stack mark
	341	'f' => 2, # fold constants
	342	's' => 4, # always produces scalar
	343	't' => 8, # needs target scalar
903fd87c NC	344	'T' => 8 \| 16, # ... which may be lexical
903fd87c NC	345	'i' => 0, # always produces integer (unused since e7311069)
c2dedb93 MHM	346	'I' => 32, # has corresponding int op
	347	'd' => 64, # danger, unknown side effects
	348	'u' => 128, # defaults to $_
	349	);
	350
a85d93d9 JH	351	my %OP_IS_SOCKET;
a85d93d9 JH	352	my %OP_IS_FILETEST;
6ecf81d6	353	my %OP_IS_FT_ACCESS;
903fd87c NC	354	my $OCSHIFT = 8;
903fd87c NC	355	my $OASHIFT = 12;
a85d93d9	356
c2dedb93	357	for my $op (@ops) {
d6480c9d	358	my $argsum = 0;
c2dedb93 MHM	359	my $flags = $flags{$op};
	360	for my $flag (keys %opflags) {
	361	if ($flags =~ s/$flag//) {
cb7b5e07	362	die "Flag collision for '$op' ($flags{$op}, $flag)\n"
c2dedb93 MHM	363	if $argsum & $opflags{$flag};
	364	$argsum \|= $opflags{$flag};
	365	}
	366	}
cb7b5e07	367	die qq[Opcode '$op' has no class indicator ($flags{$op} => $flags)\n]
c2dedb93 MHM	368	unless exists $opclass{$flags};
	369	$argsum \|= $opclass{$flags} << $OCSHIFT;
	370	my $argshift = $OASHIFT;
	371	for my $arg (split(' ',$args{$op})) {
a85d93d9	372	if ($arg =~ /^F/) {
e71197e2 JC	373	# record opnums of these opnames
	374	$OP_IS_SOCKET{$op} = $opnum{$op} if $arg =~ s/s//;
	375	$OP_IS_FILETEST{$op} = $opnum{$op} if $arg =~ s/-//;
6ecf81d6	376	$OP_IS_FT_ACCESS{$op} = $opnum{$op} if $arg =~ s/\+//;
a85d93d9	377	}
d6480c9d	378	my $argnum = ($arg =~ s/\?//) ? 8 : 0;
c2dedb93 MHM	379	die "op = $op, arg = $arg\n"
c2dedb93 MHM	380	unless exists $argnum{$arg};
79072805	381	$argnum += $argnum{$arg};
c2dedb93 MHM	382	die "Argument overflow for '$op'\n"
	383	if $argshift >= $ARGBITS \|\|
	384	$argnum > ((1 << ($ARGBITS - $argshift)) - 1);
	385	$argsum += $argnum << $argshift;
	386	$argshift += 4;
79072805 LW	387	}
79072805 LW	388	$argsum = sprintf("0x%08x", $argsum);
2d6469fe	389	print $oc "\t", tab(3, "$argsum,"), "/* $op */\n";
79072805 LW	390	}
79072805 LW	391
2d6469fe	392	print $oc <<'END';
79072805 LW	393	};
79072805 LW	394	#endif
73c4f7a1	395
bae1192d JH	396	#endif /* !PERL_GLOBAL_STRUCT_INIT */
bae1192d JH	397
73c4f7a1	398	END_EXTERN_C
79072805 LW	399	END
79072805 LW	400
e71197e2 JC	401	# Emit OP_IS_* macros
e71197e2 JC	402
2d6469fe	403	print $on <<'EO_OP_IS_COMMENT';
e71197e2 JC	404
	405	/* the OP_IS_(SOCKET\|FILETEST) macros are optimized to a simple range
	406	check because all the member OPs are contiguous in opcode.pl
f8a58b02	407	<OPS> table. opcode.pl verifies the range contiguity. */
e71197e2 JC	408	EO_OP_IS_COMMENT
	409
	410	gen_op_is_macro( \%OP_IS_SOCKET, 'OP_IS_SOCKET');
	411	gen_op_is_macro( \%OP_IS_FILETEST, 'OP_IS_FILETEST');
6ecf81d6	412	gen_op_is_macro( \%OP_IS_FT_ACCESS, 'OP_IS_FILETEST_ACCESS');
e71197e2 JC	413
	414	sub gen_op_is_macro {
	415	my ($op_is, $macname) = @_;
	416	if (keys %$op_is) {
	417
	418	# get opnames whose numbers are lowest and highest
	419	my ($first, @rest) = sort {
	420	$op_is->{$a} <=> $op_is->{$b}
	421	} keys %$op_is;
	422
	423	my $last = pop @rest; # @rest slurped, get its last
cb7b5e07	424	die "Invalid range of ops: $first .. $last\n" unless $last;
6ecf81d6	425
ce716c52	426	print $on "\n#define $macname(op) \\\n\t(";
6ecf81d6	427
e71197e2 JC	428	# verify that op-ct matches 1st..last range (and fencepost)
	429	# (we know there are no dups)
	430	if ( $op_is->{$last} - $op_is->{$first} == scalar @rest + 1) {
	431
	432	# contiguous ops -> optimized version
424a4936	433	print $on "(op) >= OP_" . uc($first) . " && (op) <= OP_" . uc($last);
ce716c52	434	print $on ")\n";
e71197e2 JC	435	}
e71197e2 JC	436	else {
424a4936	437	print $on join(" \|\| \\\n\t ",
6ecf81d6	438	map { "(op) == OP_" . uc() } sort keys %$op_is);
ce716c52	439	print $on ")\n";
e71197e2 JC	440	}
e71197e2 JC	441	}
a85d93d9 JH	442	}
a85d93d9 JH	443
f038801a	444	my $pp = safer_open('pp_proto.h-new', 'pp_proto.h');
a27f85b3	445
78102347	446	print $pp read_only_top(lang => 'C', by => 'opcode.pl', from => 'its data');
a27f85b3	447
981b7185 NC	448	{
	449	my %funcs;
	450	for (@ops) {
7627e6d0	451	my $name = $alias{$_} ? $alias{$_}[0] : "Perl_pp_$_";
981b7185 NC	452	++$funcs{$name};
	453	}
	454	print $pp "PERL_CALLCONV OP *$_(pTHX);\n" foreach sort keys %funcs;
735e0d5c	455	}
ce716c52 NC	456	foreach ($oc, $on, $pp) {
	457	read_only_bottom_close_and_rename($_);
	458	}
b162f9ea IZ	459
	460	# Some comments about 'T' opcode classifier:
	461
	462	# Safe to set if the ppcode uses:
	463	# tryAMAGICbin, tryAMAGICun, SETn, SETi, SETu, PUSHn, PUSHTARG, SETTARG,
	464	# SETs(TARG), XPUSHn, XPUSHu,
	465
	466	# Unsafe to set if the ppcode uses dTARG or [X]RETPUSH[YES\|NO\|UNDEF]
	467
	468	# lt and friends do SETs (including ncmp, but not scmp)
	469
21f5b33c GS	470	# Additional mode of failure: the opcode can modify TARG before it "used"
	471	# all the arguments (or may call an external function which does the same).
	472	# If the target coincides with one of the arguments ==> kaboom.
	473
b162f9ea IZ	474	# pp.c pos substr each not OK (RETPUSHUNDEF)
	475	# substr vec also not OK due to LV to target (are they???)
	476	# ref not OK (RETPUSHNO)
	477	# trans not OK (dTARG; TARG = sv_newmortal();)
	478	# ucfirst etc not OK: TMP arg processed inplace
69b47968	479	# quotemeta not OK (unsafe when TARG == arg)
91e74348	480	# each repeat not OK too due to list context
b162f9ea	481	# pack split - unknown whether they are safe
dae78bb1 IZ	482	# sprintf: is calling do_sprintf(TARG,...) which can act on TARG
dae78bb1 IZ	483	# before other args are processed.
b162f9ea	484
21f5b33c GS	485	# Suspicious wrt "additional mode of failure" (and only it):
	486	# schop, chop, postinc/dec, bit_and etc, negate, complement.
	487
	488	# Also suspicious: 4-arg substr, sprintf, uc/lc (POK_only), reverse, pack.
	489
	490	# substr/vec: doing TAINT_off()???
	491
b162f9ea IZ	492	# pp_hot.c
	493	# readline - unknown whether it is safe
	494	# match subst not OK (dTARG)
	495	# grepwhile not OK (not always setting)
69b47968	496	# join not OK (unsafe when TARG == arg)
b162f9ea	497
21f5b33c GS	498	# Suspicious wrt "additional mode of failure": concat (dealt with
	499	# in ck_sassign()), join (same).
	500
b162f9ea IZ	501	# pp_ctl.c
	502	# mapwhile flip caller not OK (not always setting)
	503
	504	# pp_sys.c
	505	# backtick glob warn die not OK (not always setting)
	506	# warn not OK (RETPUSHYES)
	507	# open fileno getc sysread syswrite ioctl accept shutdown
	508	# ftsize(etc) readlink telldir fork alarm getlogin not OK (RETPUSHUNDEF)
	509	# umask select not OK (XPUSHs(&PL_sv_undef);)
	510	# fileno getc sysread syswrite tell not OK (meth("FILENO" "GETC"))
	511	# sselect shm* sem* msg* syscall - unknown whether they are safe
	512	# gmtime not OK (list context)
	513
21f5b33c	514	# Suspicious wrt "additional mode of failure": warn, die, select.