[perl5.git] / t / porting / libperl.t

#!/usr/bin/perl -w

# Try opening libperl.a with nm, and verifying it has the kind of symbols
# we expected.  Fail softly, expect things only on known platforms.
#
# Also, if the rarely-used builds options -DPERL_GLOBAL_STRUCT or
# -DPERL_GLOBAL_STRUCT_PRIVATE are used, verify that they did what
# they were meant to do, hide the global variables (see perlguts for
# the details).

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
    require "./test.pl";
}

use strict;

use Config;

if ($Config{cc} =~ /g\+\+/) {
    # XXX Could use c++filt, maybe.
    skip_all "on g++";
}

my $libperl_a;

for my $f (qw(../libperl.a libperl.a)) {
  if (-f $f) {
    $libperl_a = $f;
    last;
  }
}

unless (defined $libperl_a) {
  skip_all "no libperl.a";
}

print "# libperl = $libperl_a\n";

my $nm;
my $nm_opt = '';
my $nm_style;

if ($^O eq 'linux') {
    $nm = '/usr/bin/nm';
    $nm_style = 'gnu';
} elsif ($^O eq 'darwin') {
    $nm = '/usr/bin/nm';
    $nm_style = 'darwin';
    # With the -m option we get better information than the BSD-like
    # default: with the default, a lot of symbols get dumped into 'S'
    # or 's', for example one cannot tell the difference between const
    # and non-const symbols.
    $nm_opt = '-m';
}

unless (defined $nm) {
  skip_all "no nm";
}

unless (defined $nm_style) {
  skip_all "no nm style";
}

print "# nm = $nm\n";
print "# nm_style = $nm_style\n";
print "# nm_opt = $nm_opt\n";

unless (-x $nm) {
    skip_all "no executable nm $nm";
}

if ($nm_style eq 'gnu') {
    open(my $nm_fh, "$nm --version|") or
        skip_all "nm failed: $!";
    my $gnu_verified;
    while (<$nm_fh>) {
        if (/^GNU nm/) {
            $gnu_verified = 1;
            last;
        }
    }
    unless ($gnu_verified) {
        plan skil_all => "no GNU nm";
    }
}

open(my $nm_fh, "$nm $nm_opt $libperl_a |") or
    skip_all "$nm $nm_opt $libperl_a failed: $!";

sub nm_parse_gnu {
    my $symbols = shift;
    if (m{^(\w+\.o):$}) {
        $symbols->{obj}{$1}++;
        $symbols->{o} = $1;
    } else {
        die "$0: undefined current object: $_" unless defined $symbols->{o};
	if (/^[0-9a-f]{16} [Rr] (\w+)$/) {
	    $symbols->{data}{const}{$1}{$symbols->{o}}++;
	} elsif (/^[0-9a-f]{16} r .+$/) {
	    # Skip local const.
	} elsif (/^[0-9a-f]{16} [Tti] (\w+)(\..+)?$/) {
	    $symbols->{text}{$1}{$symbols->{o}}++;
	} elsif (/^[0-9a-f]{16} C (\w+)$/) {
	    $symbols->{data}{common}{$1}{$symbols->{o}}++;
	} elsif (/^[0-9a-f]{16} [BbSs] (\w+)(\.\d+)?$/) {
	    $symbols->{data}{bss}{$1}{$symbols->{o}}++;
	} elsif (/^0{16} D _LIB_VERSION$/) {
	    # Skip the _LIB_VERSION (not ours).
	} elsif (/^[0-9a-f]{16} [DdGg] (\w+)$/) {
	    $symbols->{data}{data}{$1}{$symbols->{o}}++;
	} elsif (/^ {16} U (\w+)$/) {
	    # Skip the undefined.
	} elsif (/^[0-9a-f]{16} . \.?(\w+)$/) {
	    # Skip the unknown types.
            print "# Unknown type: $_ ($symbols->{o})\n";
	} else {
            print "# Unexpected nm output '$_' ($symbols->{o})\n";
	}
    }
}

sub nm_parse_darwin {
    my $symbols = shift;
    if (m{^(?:\.\./)?libperl\.a\((\w+\.o)\):$}) {
        $symbols->{obj}{$1}++;
        $symbols->{o} = $1;
    } else {
        die "$0: undefined current object: $_" unless defined $symbols->{o};
        if (/^[0-9a-f]{16} \(__TEXT,__(?:eh_frame|cstring)\) /) {
            # Skip the eh_frame and cstring.
        } elsif (/^[0-9a-f]{16} \(__TEXT,__(?:const|literal\d+)\) (?:non-)?external _?(\w+)(\.\w+)?$/) {
            my ($symbol, $suffix) = ($1, $2);
            # Ignore function-local constants like
            # _Perl_av_extend_guts.oom_array_extend
            return if defined $suffix && /__TEXT,__const/;
            $symbols->{data}{const}{$symbol}{$symbols->{o}}++;
        } elsif (/^[0-9a-f]{16} \(__TEXT,__text\) (?:non-)?external _(\w+)$/) {
            $symbols->{text}{$1}{$symbols->{o}}++;
        } elsif (/^[0-9a-f]{16} \(__DATA,__(const|data|bss|common)\) (?:non-)?external _(\w+)(\.\w+)?$/) {
            my ($dtype, $symbol, $suffix) = ($1, $2, $3);
            # Ignore function-local constants like
            # _Perl_pp_gmtime.dayname
            return if defined $suffix;
            $symbols->{data}{$dtype}{$symbol}{$symbols->{o}}++;
        } elsif (/^[0-9a-f]{16} \(__DATA,__const\) non-external _\.memset_pattern\d*$/) {
            # Skip this, whatever it is (some inlined leakage from darwin libc?)
        } elsif (/^ {16} \(undefined\) /) {
            # Skip the undefined.
        } elsif (/^[0-9a-f]{16} \(__\w+,__\w+\) /) {
            # Skip the unknown types.
            print "# Unknown type: $_ ($symbols->{o})\n";
        } else {
            print "# Unexpected nm output '$_' ($symbols->{o})\n";
        }
    }
}

my $nm_parse;

if ($nm_style eq 'gnu') {
    $nm_parse = \&nm_parse_gnu;
} elsif ($nm_style eq 'darwin') {
    $nm_parse = \&nm_parse_darwin;
}

unless (defined $nm_parse) {
    skip_all "no nm parser";
}

my %symbols;

while (<$nm_fh>) {
    next if /^$/;
    chomp;
    $nm_parse->(\%symbols);
}

# use Data::Dumper; print Dumper(\%symbols);

if (keys %symbols == 0) {
    skip_all "no symbols\n";
}

# These should always be true for everyone.

ok($symbols{obj}{'pp.o'}, "has object pp.o");
ok($symbols{text}{'Perl_peep'}, "has text Perl_peep");
ok($symbols{text}{'Perl_pp_uc'}{'pp.o'}, "has text Perl_pp_uc in pp.o");
ok(exists $symbols{data}{const}, "has data const symbols");
ok($symbols{data}{const}{PL_no_mem}{'globals.o'}, "has PL_no_mem");

my $DEBUGGING = $Config{ccflags} =~ /-DDEBUGGING/ ? 1 : 0;

my $GS  = $Config{ccflags} =~ /-DPERL_GLOBAL_STRUCT\b/ ? 1 : 0;
my $GSP = $Config{ccflags} =~ /-DPERL_GLOBAL_STRUCT_PRIVATE/ ? 1 : 0;

print "# GS  = $GS\n";
print "# GSP = $GSP\n";

my %data_symbols;

for my $dtype (sort keys %{$symbols{data}}) {
    for my $symbol (sort keys %{$symbols{data}{$dtype}}) {
        $data_symbols{$symbol}++;
    }
}

# Since we are deprived of Test::More.
sub is_deeply {
    my ($a, $b) = @_;
    if (ref $a eq 'ARRAY' && ref $b eq 'ARRAY') {
	if (@$a == @$b) {
	    for my $i (0..$#$a) {
		unless ($a->[$i] eq $b->[$i]) {
                    printf("# LHS elem #%d '%s' ne RHS elem #%d '%s'\n",
                           $a->[$i], $b->[$i]);
		    return 0;
		}
	    }
	    return 1;
	} else {
            printf("# LHS length %d, RHS length %d\n",
                   @$a, @$b);
	    return 0;
	}
    } else {
	die "$0: Unexpcted: is_deeply $a $b\n";
    }
}

# The following tests differ between vanilla vs $GSP or $GS.
#
# Some terminology:
# - "text" symbols are code
# - "data" symbols are data (duh), with subdivisions:
#   - "bss": (Block-Started-by-Symbol: originally from IBM assembler...),
#     uninitialized data, which often even doesn't exist in the object
#     file as such, only its size does, which is then created on demand
#     by the loader
#  - "const": initialized read-only data, like string literals
#  - "common": uninitialized data unless initialized...
#    (the full story is too long for here, see "man nm")
#  - "data": initialized read-write data
#    (somewhat confusingly below: "data data", but it makes code simpler)

if ($GSP) {
    print "# -DPERL_GLOBAL_STRUCT_PRIVATE\n";
    ok(!exists $data_symbols{PL_hash_seed}, "has no PL_hash_seed");
    ok(!exists $data_symbols{PL_ppaddr}, "has no PL_ppaddr");

    ok(! exists $symbols{data}{bss}, "has no data bss symbols");
    ok(! exists $symbols{data}{data}, "has no data data symbols");
    ok(! exists $symbols{data}{common}, "has no data common symbols");

    # -DPERL_GLOBAL_STRUCT_PRIVATE should NOT have
    # the extra text symbol for accessing the vars
    # (as opposed to "just" -DPERL_GLOBAL_STRUCT)
    ok(! exists $symbols{text}{Perl_GetVars}, "has no Perl_GetVars");
} elsif ($GS) {
    print "# -DPERL_GLOBAL_STRUCT\n";
    ok(!exists $data_symbols{PL_hash_seed}, "has no PL_hash_seed");
    ok(!exists $data_symbols{PL_ppaddr}, "has no PL_ppaddr");

    ok(! exists $symbols{data}{bss}, "has no data bss symbols");

    # These PerlIO data symbols are left visible with
    # -DPERL_GLOBAL_STRUCT (as opposed to -DPERL_GLOBAL_STRUCT_PRIVATE)
    my @PerlIO =
        qw(
           PerlIO_byte
           PerlIO_crlf
           PerlIO_pending
           PerlIO_perlio
           PerlIO_raw
           PerlIO_remove
           PerlIO_stdio
           PerlIO_unix
           PerlIO_utf8
          );

    # PL_magic_vtables is const with -DPERL_GLOBAL_STRUCT_PRIVATE but
    # otherwise not const -- because of SWIG which wants to modify
    # the table.  Evil SWIG, eeevil.

    # my_cxt_index is used with PERL_IMPLICIT_CONTEXT, which
    # -DPERL_GLOBAL_STRUCT has turned on.
    is_deeply([sort keys %{$symbols{data}{data}}],
              [sort('PL_VarsPtr',
                    @PerlIO,
                    'PL_magic_vtables',
                    'my_cxt_index')],
              "data data symbols");

    # Only one data common symbol, our "supervariable".
    is_deeply([sort keys %{$symbols{data}{common}}],
              ['PL_Vars'],
              "data common symbols");

    ok($symbols{data}{data}{PL_VarsPtr}{'globals.o'}, "has PL_VarsPtr");
    ok($symbols{data}{common}{PL_Vars}{'globals.o'}, "has PL_Vars");

    # -DPERL_GLOBAL_STRUCT has extra text symbol for accessing the vars.
    ok($symbols{text}{Perl_GetVars}{'util.o'}, "has Perl_GetVars");
} else {
    print "# neither -DPERL_GLOBAL_STRUCT nor -DPERL_GLOBAL_STRUCT_PRIVATE\n";

    ok($symbols{data}{common}{PL_hash_seed}{'globals.o'}, "has PL_hash_seed");
    ok($symbols{data}{data}{PL_ppaddr}{'globals.o'}, "has PL_ppaddr");

    # None of the GLOBAL_STRUCT* business here.
    ok(! exists $symbols{data}{data}{PL_VarsPtr}, "has no PL_VarsPtr");
    ok(! exists $symbols{data}{common}{PL_Vars}, "has no PL_Vars");
    ok(! exists $symbols{text}{Perl_GetVars}, "has no Perl_GetVars");
}

done_testing();
Commit	Line	Data
d92f47ae JH	1	#!/usr/bin/perl -w
	2
	3	# Try opening libperl.a with nm, and verifying it has the kind of symbols
	4	# we expected. Fail softly, expect things only on known platforms.
	5	#
	6	# Also, if the rarely-used builds options -DPERL_GLOBAL_STRUCT or
	7	# -DPERL_GLOBAL_STRUCT_PRIVATE are used, verify that they did what
	8	# they were meant to do, hide the global variables (see perlguts for
	9	# the details).
	10
	11	BEGIN {
	12	chdir 't' if -d 't';
	13	@INC = '../lib';
	14	require "./test.pl";
	15	}
	16
	17	use strict;
	18
	19	use Config;
	20
	21	if ($Config{cc} =~ /g\+\+/) {
	22	# XXX Could use c++filt, maybe.
	23	skip_all "on g++";
	24	}
	25
	26	my $libperl_a;
	27
	28	for my $f (qw(../libperl.a libperl.a)) {
	29	if (-f $f) {
	30	$libperl_a = $f;
	31	last;
	32	}
	33	}
	34
	35	unless (defined $libperl_a) {
	36	skip_all "no libperl.a";
	37	}
	38
	39	print "# libperl = $libperl_a\n";
	40
	41	my $nm;
	42	my $nm_opt = '';
	43	my $nm_style;
	44
	45	if ($^O eq 'linux') {
	46	$nm = '/usr/bin/nm';
	47	$nm_style = 'gnu';
	48	} elsif ($^O eq 'darwin') {
	49	$nm = '/usr/bin/nm';
	50	$nm_style = 'darwin';
	51	# With the -m option we get better information than the BSD-like
	52	# default: with the default, a lot of symbols get dumped into 'S'
	53	# or 's', for example one cannot tell the difference between const
	54	# and non-const symbols.
	55	$nm_opt = '-m';
	56	}
	57
	58	unless (defined $nm) {
	59	skip_all "no nm";
	60	}
	61
	62	unless (defined $nm_style) {
	63	skip_all "no nm style";
	64	}
65
66	print "# nm = $nm\n";
67	print "# nm_style = $nm_style\n";
68	print "# nm_opt = $nm_opt\n";
69
70	unless (-x $nm) {
71	skip_all "no executable nm $nm";
72	}
73
74	if ($nm_style eq 'gnu') {
75	open(my $nm_fh, "$nm --version\|") or
76	skip_all "nm failed: $!";
77	my $gnu_verified;
78	while (<$nm_fh>) {
79	if (/^GNU nm/) {
80	$gnu_verified = 1;
81	last;
82	}
83	}
84	unless ($gnu_verified) {
85	plan skil_all => "no GNU nm";
86	}
87	}
88
89	open(my $nm_fh, "$nm $nm_opt $libperl_a \|") or
90	skip_all "$nm $nm_opt $libperl_a failed: $!";
91
92	sub nm_parse_gnu {
93	my $symbols = shift;
94	if (m{^(\w+\.o):$}) {
95	$symbols->{obj}{$1}++;
96	$symbols->{o} = $1;
97	} else {
98	die "$0: undefined current object: $_" unless defined $symbols->{o};
99	if (/^[0-9a-f]{16} [Rr] (\w+)$/) {
100	$symbols->{data}{const}{$1}{$symbols->{o}}++;
101	} elsif (/^[0-9a-f]{16} r .+$/) {
102	# Skip local const.
103	} elsif (/^[0-9a-f]{16} [Tti] (\w+)(\..+)?$/) {
104	$symbols->{text}{$1}{$symbols->{o}}++;
105	} elsif (/^[0-9a-f]{16} C (\w+)$/) {
106	$symbols->{data}{common}{$1}{$symbols->{o}}++;
107	} elsif (/^[0-9a-f]{16} [BbSs] (\w+)(\.\d+)?$/) {
108	$symbols->{data}{bss}{$1}{$symbols->{o}}++;
109	} elsif (/^0{16} D _LIB_VERSION$/) {
110	# Skip the _LIB_VERSION (not ours).
111	} elsif (/^[0-9a-f]{16} [DdGg] (\w+)$/) {
112	$symbols->{data}{data}{$1}{$symbols->{o}}++;
113	} elsif (/^ {16} U (\w+)$/) {
114	# Skip the undefined.
115	} elsif (/^[0-9a-f]{16} . \.?(\w+)$/) {
116	# Skip the unknown types.
117	print "# Unknown type: $_ ($symbols->{o})\n";
118	} else {
119	print "# Unexpected nm output '$_' ($symbols->{o})\n";
120	}
121	}
122	}
123
124	sub nm_parse_darwin {
125	my $symbols = shift;
126	if (m{^(?:\.\./)?libperl\.a\((\w+\.o)\):$}) {
127	$symbols->{obj}{$1}++;
128	$symbols->{o} = $1;
129	} else {
130	die "$0: undefined current object: $_" unless defined $symbols->{o};
131	if (/^[0-9a-f]{16} \(__TEXT,__(?:eh_frame\|cstring)\) /) {
132	# Skip the eh_frame and cstring.
133	} elsif (/^[0-9a-f]{16} \(__TEXT,__(?:const\|literal\d+)\) (?:non-)?external _?(\w+)(\.\w+)?$/) {
134	my ($symbol, $suffix) = ($1, $2);
135	# Ignore function-local constants like
136	# _Perl_av_extend_guts.oom_array_extend
137	return if defined $suffix && /__TEXT,__const/;
138	$symbols->{data}{const}{$symbol}{$symbols->{o}}++;
139	} elsif (/^[0-9a-f]{16} \(__TEXT,__text\) (?:non-)?external _(\w+)$/) {
140	$symbols->{text}{$1}{$symbols->{o}}++;
141	} elsif (/^[0-9a-f]{16} \(__DATA,__(const\|data\|bss\|common)\) (?:non-)?external _(\w+)(\.\w+)?$/) {
142	my ($dtype, $symbol, $suffix) = ($1, $2, $3);
143	# Ignore function-local constants like
144	# _Perl_pp_gmtime.dayname
145	return if defined $suffix;
146	$symbols->{data}{$dtype}{$symbol}{$symbols->{o}}++;
147	} elsif (/^[0-9a-f]{16} \(__DATA,__const\) non-external _\.memset_pattern\d*$/) {
148	# Skip this, whatever it is (some inlined leakage from darwin libc?)
149	} elsif (/^ {16} \(undefined\) /) {
150	# Skip the undefined.
151	} elsif (/^[0-9a-f]{16} \(__\w+,__\w+\) /) {
152	# Skip the unknown types.
153	print "# Unknown type: $_ ($symbols->{o})\n";
154	} else {
155	print "# Unexpected nm output '$_' ($symbols->{o})\n";
156	}
157	}
158	}
159
160	my $nm_parse;
161
162	if ($nm_style eq 'gnu') {
163	$nm_parse = \&nm_parse_gnu;
164	} elsif ($nm_style eq 'darwin') {
165	$nm_parse = \&nm_parse_darwin;
166	}
167
168	unless (defined $nm_parse) {
169	skip_all "no nm parser";
170	}
171
172	my %symbols;
173
174	while (<$nm_fh>) {
175	next if /^$/;
176	chomp;
177	$nm_parse->(\%symbols);
178	}
179
180	# use Data::Dumper; print Dumper(\%symbols);
181
182	if (keys %symbols == 0) {
183	skip_all "no symbols\n";
184	}
185
186	# These should always be true for everyone.
187
188	ok($symbols{obj}{'pp.o'}, "has object pp.o");
189	ok($symbols{text}{'Perl_peep'}, "has text Perl_peep");
190	ok($symbols{text}{'Perl_pp_uc'}{'pp.o'}, "has text Perl_pp_uc in pp.o");
191	ok(exists $symbols{data}{const}, "has data const symbols");
192	ok($symbols{data}{const}{PL_no_mem}{'globals.o'}, "has PL_no_mem");
193
194	my $DEBUGGING = $Config{ccflags} =~ /-DDEBUGGING/ ? 1 : 0;
195
196	my $GS = $Config{ccflags} =~ /-DPERL_GLOBAL_STRUCT\b/ ? 1 : 0;
197	my $GSP = $Config{ccflags} =~ /-DPERL_GLOBAL_STRUCT_PRIVATE/ ? 1 : 0;
198
199	print "# GS = $GS\n";
200	print "# GSP = $GSP\n";
201
202	my %data_symbols;
203
204	for my $dtype (sort keys %{$symbols{data}}) {
205	for my $symbol (sort keys %{$symbols{data}{$dtype}}) {
206	$data_symbols{$symbol}++;
207	}
208	}
209
210	# Since we are deprived of Test::More.
211	sub is_deeply {
212	my ($a, $b) = @_;
213	if (ref $a eq 'ARRAY' && ref $b eq 'ARRAY') {
214	if (@$a == @$b) {
215	for my $i (0..$#$a) {
216	unless ($a->[$i] eq $b->[$i]) {
217	printf("# LHS elem #%d '%s' ne RHS elem #%d '%s'\n",
218	$a->[$i], $b->[$i]);
219	return 0;
220	}
221	}
222	return 1;
223	} else {
224	printf("# LHS length %d, RHS length %d\n",
225	@$a, @$b);
226	return 0;
227	}
228	} else {
229	die "$0: Unexpcted: is_deeply $a $b\n";
230	}
231	}
232
233	# The following tests differ between vanilla vs $GSP or $GS.
234	#
235	# Some terminology:
236	# - "text" symbols are code
237	# - "data" symbols are data (duh), with subdivisions:
238	# - "bss": (Block-Started-by-Symbol: originally from IBM assembler...),
239	# uninitialized data, which often even doesn't exist in the object
240	# file as such, only its size does, which is then created on demand
241	# by the loader
242	# - "const": initialized read-only data, like string literals
243	# - "common": uninitialized data unless initialized...
244	# (the full story is too long for here, see "man nm")
245	# - "data": initialized read-write data
246	# (somewhat confusingly below: "data data", but it makes code simpler)
247
248	if ($GSP) {
249	print "# -DPERL_GLOBAL_STRUCT_PRIVATE\n";
250	ok(!exists $data_symbols{PL_hash_seed}, "has no PL_hash_seed");
251	ok(!exists $data_symbols{PL_ppaddr}, "has no PL_ppaddr");
252
253	ok(! exists $symbols{data}{bss}, "has no data bss symbols");
254	ok(! exists $symbols{data}{data}, "has no data data symbols");
255	ok(! exists $symbols{data}{common}, "has no data common symbols");
256
257	# -DPERL_GLOBAL_STRUCT_PRIVATE should NOT have
258	# the extra text symbol for accessing the vars
259	# (as opposed to "just" -DPERL_GLOBAL_STRUCT)
260	ok(! exists $symbols{text}{Perl_GetVars}, "has no Perl_GetVars");
261	} elsif ($GS) {
262	print "# -DPERL_GLOBAL_STRUCT\n";
263	ok(!exists $data_symbols{PL_hash_seed}, "has no PL_hash_seed");
264	ok(!exists $data_symbols{PL_ppaddr}, "has no PL_ppaddr");
265
266	ok(! exists $symbols{data}{bss}, "has no data bss symbols");
267
268	# These PerlIO data symbols are left visible with
269	# -DPERL_GLOBAL_STRUCT (as opposed to -DPERL_GLOBAL_STRUCT_PRIVATE)
270	my @PerlIO =
271	qw(
272	PerlIO_byte
273	PerlIO_crlf
274	PerlIO_pending
275	PerlIO_perlio
276	PerlIO_raw
277	PerlIO_remove
278	PerlIO_stdio
279	PerlIO_unix
280	PerlIO_utf8
281	);
282
283	# PL_magic_vtables is const with -DPERL_GLOBAL_STRUCT_PRIVATE but
284	# otherwise not const -- because of SWIG which wants to modify
285	# the table. Evil SWIG, eeevil.
286
287	# my_cxt_index is used with PERL_IMPLICIT_CONTEXT, which
288	# -DPERL_GLOBAL_STRUCT has turned on.
289	is_deeply([sort keys %{$symbols{data}{data}}],
290	[sort('PL_VarsPtr',
291	@PerlIO,
292	'PL_magic_vtables',
293	'my_cxt_index')],
294	"data data symbols");
295
296	# Only one data common symbol, our "supervariable".
297	is_deeply([sort keys %{$symbols{data}{common}}],
298	['PL_Vars'],
299	"data common symbols");
300
301	ok($symbols{data}{data}{PL_VarsPtr}{'globals.o'}, "has PL_VarsPtr");
302	ok($symbols{data}{common}{PL_Vars}{'globals.o'}, "has PL_Vars");
303
304	# -DPERL_GLOBAL_STRUCT has extra text symbol for accessing the vars.
305	ok($symbols{text}{Perl_GetVars}{'util.o'}, "has Perl_GetVars");
306	} else {
307	print "# neither -DPERL_GLOBAL_STRUCT nor -DPERL_GLOBAL_STRUCT_PRIVATE\n";
308
309	ok($symbols{data}{common}{PL_hash_seed}{'globals.o'}, "has PL_hash_seed");
310	ok($symbols{data}{data}{PL_ppaddr}{'globals.o'}, "has PL_ppaddr");
311
312	# None of the GLOBAL_STRUCT* business here.
313	ok(! exists $symbols{data}{data}{PL_VarsPtr}, "has no PL_VarsPtr");
314	ok(! exists $symbols{data}{common}{PL_Vars}, "has no PL_Vars");
315	ok(! exists $symbols{text}{Perl_GetVars}, "has no Perl_GetVars");
316	}
317
318	done_testing();