/
hash.t
1527 lines (1243 loc) · 34 KB
/
hash.t
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#!./parrot
# Copyright (C) 2001-2010, Parrot Foundation.
=head1 NAME
t/pmc/hash.t - Test the Hash PMC
=head1 SYNOPSIS
% prove t/pmc/hash.t
=head1 DESCRIPTION
Tests the C<Hash> PMC. Checks key access with various types of
normal and potentially hazardous keys. Does a bit of stress testing as
well.
=cut
.include 'except_types.pasm'
.include 'datatypes.pasm'
.include 'hash_key_type.pasm'
.sub main :main
.include 'test_more.pir'
initial_hash_tests()
more_than_one_hash()
hash_key_type()
hash_value_type()
null_key()
hash_keys_with_nulls_in_them()
nearly_the_same_hash_keys()
the_same_hash_keys()
key_that_hashes_to_zero()
size_of_the_hash()
stress_test_loop_set_check()
stress_test_lots_of_keys()
stress_test_loop_set_loop_check()
testing_two_hash_indices_with_integers_at_a_time()
testing_two_hash_indices_with_numbers_at_a_time()
testing_two_hash_indices_with_strings_at_a_time()
setting_and_getting_scalar_pmcs()
setting_scalar_pmcs_and_getting_scalar_values()
getting_values_from_undefined_keys()
setting_and_getting_non_scalar_pmcs()
testing_clone()
clone_doesnt_crash_on_deleted_keys()
clone_preserves_order()
freeze_thaw_preserves_order()
compound_keys()
getting_pmcs_from_compound_keys()
getting_pmcs_from_string_int_compound_keys()
if_hash()
unless_hash()
defined_hash()
exists_hash_key()
delete_hash_key()
cloning_keys()
cloning_pmc_vals()
delete_and_free_list()
exists_with_constant_string_key()
hash_in_pir()
setting_with_compound_keys()
mutating_the_lookup_string()
check_whether_interface_is_done()
iter_over_hash()
broken_delete()
unicode_keys_register_rt_39249()
unicode_keys_literal_rt_39249()
integer_keys()
value_types_convertion()
elements_in_hash()
equality_tests()
pmc_keys()
'done_testing'()
.end
.sub initial_hash_tests
new $P0, 'Hash'
set $P0["foo"], -7
set $P0["bar"], 3.5
set $P0["baz"], "value"
set $I0, $P0["foo"]
set $N0, $P0["bar"]
set $S0, $P0["baz"]
is( $I0, -7, 'lookup Int in hash' )
is( $N0, 3.500000, 'lookup Num in hash' )
is( $S0, "value", 'lookup Str in hash' )
set $S1, "oof"
set $S2, "rab"
set $S3, "zab"
set $P0[$S1], 7
set $P0[$S2], -3.5
set $P0[$S3], "VALUE"
set $I0, $P0[$S1]
set $N0, $P0[$S2]
set $S0, $P0[$S3]
is( $I0, 7, 'lookup Int in hash via Str' )
is( $N0, -3.500000, 'lookup Num in hash via Str' )
is( $S0, "VALUE", 'lookup Str in hash via Str' )
.end
.sub more_than_one_hash
new $P0, ['Hash']
set $S0, "key"
set $P0[$S0], 1
new $P1, ['Hash']
set $S1, "another_key"
set $P1[$S1], 2
set $I0, $P0[$S0]
set $I1, $P1[$S1]
is( $I0, 1, 'two hashes: lookup Int from hash via Str' )
is( $I1, 2, 'two hashes: lookup Int from hash via Str in second' )
.end
.sub hash_key_type
.local pmc h
.local int i
h = new ['Hash']
h = .Hash_key_type_int
h['01'] = 42
i = h[1]
is(i, 42, 'key type int')
# Use the method here to check it at the same time.
h.'set_key_type'(.Hash_key_type_STRING)
h[1] = 42
i = h['01']
isnt(i, 42, 'key type STRING')
i = h.'get_key_type'()
is(i, .Hash_key_type_STRING, 'method get_key_type return type STRING')
push_eh invalid_type
h = -973 # Let's hope it will never become a valid type
pop_eh
ok(0, "Setting invalid type should throw")
goto end
invalid_type:
pop_eh
ok(1, 'Setting invalid type throws')
end:
.end
.sub hash_value_type
.local pmc h, eh
.local int r
h = new ['Hash']
h.'set_value_type'(.DATATYPE_INTVAL)
r = h.'get_value_type'()
is(r, .DATATYPE_INTVAL, 'get/set _value_type')
r = 1
eh = new ['ExceptionHandler']
eh.'handle_types'(.EXCEPTION_UNIMPLEMENTED)
set_label eh, catch
push_eh eh
h.'set_value_type'(999999)
r = 0
catch:
is(r, 1, 'set_value_type with invalid type throws')
.end
.sub null_key
new $P0, ['Hash']
$P0['yum'] = 5
null $S0
$I0 = 0
$P2 = new ['ExceptionHandler']
$P2.'handle_types'(.EXCEPTION_UNEXPECTED_NULL)
set_label $P2, null_ex_eh
push_eh $P2
$P1 = $P0[$S0]
goto check
null_ex_eh:
$I0 = 1
check:
pop_eh
is( $I0, 1, 'using null string as key throws' )
.end
.sub hash_keys_with_nulls_in_them
new $P0, ['Hash']
set $S0, "parp\0me"
set $S1, "parp\0you"
set $P0[$S0], 1 # $P0{parp\0me} = 1
set $P0[$S1], 2 # $P0{parp\0you} = 2
set $I0, $P0[$S0]
set $I1, $P0[$S1]
is( $I0, 1, 'hash key with null 1' )
is( $I1, 2, 'hash key will null 2' )
.end
.sub nearly_the_same_hash_keys
new $P0, ['Hash']
set $S0, "a\0"
set $S1, "\0a"
set $P0[$S0], 1
set $P0[$S1], 2
set $I0, $P0[$S0]
set $I1, $P0[$S1]
is( $I0, 1, 'hash key with null' )
is( $I1, 2, 'almost identical hash key with null' )
.end
.sub the_same_hash_keys
new $P0, ['Hash']
set $S0, "Happy"
set $S1, "Happy"
set $P0[$S0], 1
set $I0, $P0[$S0]
is( $I0, 1, 'lookup by $S0' )
set $P0[$S1], 2
set $I1, $P0[$S1]
is( $I1, 2, 'set and lookup by $S1 (identical to $S0)' )
.end
# NB Next test depends on "key2" hashing to zero, which it does with
# the current algorithm; if the algorithm changes, change the test!
# XXX - really?
.sub key_that_hashes_to_zero
new $P0, ['Hash']
set $S0, "key2"
set $P0[$S0], 1
set $I0, $P0[$S0]
is( $I0, 1, 'key that hashes to zero XXX' )
.end
.sub size_of_the_hash
new $P0, ['Hash']
set $P0["0"], 1
set $I0, $P0
is( $I0, 1, 'hash size of 1' )
set $P0["1"], 1
set $I0, $P0
is( $I0, 2, 'hash size of 2' )
set $P0["0"], 1
set $I0, $P0
is( $I0, 2, 'hash size of 2' )
$I1 = elements $P0
is( $I1, $I0, "'elements' gives the same result" )
.end
.sub stress_test_loop_set_check
new $P0, 'Hash'
set $I0, 200
set $S0, "mikey"
set $P0[$S0], "base"
concat $S1, $S0, "s"
set $P0[$S1], "bases"
set $S2, $I0
concat $S1, $S0, $S2
set $P0[$S1], "start"
set $S3, $P0["mikey"]
is( $S3, 'base', 'setup: lookup mikey' )
set $S3, $P0["mikeys"]
is( $S3, 'bases', 'setup: lookup mikeys' )
set $S3, $P0["mikey200"]
is( $S3, 'start', 'setup: lookup mikey200' )
LOOP:
eq $I0, 0, DONE
sub $I0, $I0, 1
set $S2, $I0
concat $S1, $S0, $S2
concat $S4, $S0, $S2
eq $S1, $S4, L1
## this should be fail(), but it is not implemented yet
ok( 0, 'concat mismatch' )
L1:
set $P0[$S1], $I0
set $I1, $P0[$S1]
eq $I0, $I1, L2
## this should be fail(), but it is not implemented yet
ok( 0, 'lookup mismatch' )
L2:
branch LOOP
DONE:
set $I0, $P0["mikey199"]
is( $I0, 199, 'lookup: mikey199' )
set $I0, $P0["mikey117"]
is( $I0, 117, 'lookup: mikey117' )
set $I0, $P0["mikey1"]
is( $I0, 1, 'lookup: mikey1' )
set $I0, $P0["mikey23"]
is( $I0, 23, 'lookup: miky23' )
set $I0, $P0["mikey832"]
is( $I0, 0, 'lookup: mikey832 (never set)' )
.end
## stuff them in, and check periodically that we can pull selected ones out.
## *_multiple_keys are used by stress_test_lots_of_keys
.sub set_multiple_keys
.param pmc hash
.param int key_index
.param int step
.param int count
again:
if count <= 0 goto ret
$S0 = key_index
$S1 = concat "key", $S0
$S2 = concat "value", $S0
hash[$S1] = $S2
key_index = key_index + step
count = count - 1
goto again
ret:
.end
.sub delete_multiple_keys
.param pmc hash
.param int key_index
.param int step
.param int count
again:
if count <= 0 goto ret
$S0 = key_index
$S1 = concat "key", $S0
delete hash[$S1]
key_index = key_index + step
count = count - 1
goto again
ret:
.end
.sub check_key
.param pmc hash
.param int index
$S10 = index
$S0 = concat "key", $S10
$S1 = concat "value", $S10
$S2 = hash[$S0]
$S3 = concat "correct value for key ", $S10
is( $S2, $S1, $S3 )
.end
.sub stress_test_lots_of_keys
new $P30, 'Hash'
$I29 = 1
$I30 = 1000
$I31 = 1000
# round 1
set_multiple_keys($P30, $I29, $I30, $I31)
check_key( $P30, 1 )
check_key( $P30, 1001 )
check_key( $P30, 2001 )
# round 2
$I21 = 100000
set_multiple_keys($P30, $I21, $I30, $I31)
check_key( $P30, 1 )
check_key( $P30, 1001 )
check_key( $P30, 2001 )
check_key( $P30, 100000 )
check_key( $P30, 101000 )
check_key( $P30, 102000 )
# round 3
$I22 = 50000
set_multiple_keys($P30, $I22, $I29, $I22)
check_key( $P30, 1 )
check_key( $P30, 1001 )
check_key( $P30, 2001 )
check_key( $P30, 500000 )
check_key( $P30, 510000 )
check_key( $P30, 520000 )
# round 4
delete_multiple_keys($P30, $I22, $I29, $I22)
check_key( $P30, 1001 )
check_key( $P30, 2001 )
$I50 = exists $P30['key50000']
$I51 = exists $P30['key51000']
$I52 = exists $P30['key52000']
is( $I50, 0, 'key50000 does not exist after delete' )
is( $I51, 0, 'key51000 does not exist after delete' )
is( $I52, 0, 'key52000 does not exist after delete' )
.end
# Check all values after setting all of them
.sub stress_test_loop_set_loop_check
new $P0, 'Hash'
set $I0, 200
set $S0, "mikey"
SETLOOP:
eq $I0, 0, DONE
sub $I0, $I0, 1
set $S2, $I0
concat $S1, $S0, $S2
set $P0[$S1], $I0
branch SETLOOP
set $I0, 200
GETLOOP:
eq $I0, 0, DONE
sub $I0, $I0, 1
set $S2, $I0
concat $S1, $S0, $S2
set $I1, $P0[$S1]
eq $I0, $I1, L2
is( $I0, $I1, 'lookup mismatch in stress test loop' )
.return()
L2:
branch GETLOOP
DONE:
ok( 1, 'stress test: loop set with loop check' )
.end
.sub testing_two_hash_indices_with_integers_at_a_time
new $P0, ['Hash']
set $P0["foo"],37
set $P0["bar"],-15
set $I0,$P0["foo"]
is( $I0, 37, 'lookup int in foo' )
set $I0,$P0["bar"]
is( $I0, -15, 'lookup int in bar' )
set $S1,"foo"
set $I0,$P0[$S1]
is( $I0,37, 'lookup int in foo via var' )
set $S1,"bar"
set $I0,$P0[$S1]
is( $I0,-15, 'lookup int in bar via var' )
.end
.sub testing_two_hash_indices_with_numbers_at_a_time
new $P0, ['Hash']
set $P0["foo"],37.100000
set $P0["bar"],-15.100000
set $N0,$P0["foo"]
is( $N0,37.100000, 'lookup num in foo' )
set $N0,$P0["bar"]
is( $N0,-15.100000, 'lookup num in bar' )
set $S1,"foo"
set $N0,$P0[$S1]
is( $N0,37.100000, 'lookup num in foo via var' )
set $S1,"bar"
set $N0,$P0[$S1]
is( $N0,-15.100000, 'lookup num in bar via var' )
.end
.sub testing_two_hash_indices_with_strings_at_a_time
new $P0, ['Hash']
set $P0["foo"],"baz"
set $P0["bar"],"qux"
set $S0,$P0["foo"]
is( $S0,"baz", 'lookup str in foo' )
set $S0,$P0["bar"]
is( $S0,"qux", 'lookup str in bar' )
set $S1,"foo"
set $S0,$P0[$S1]
is( $S0,"baz", 'lookup str in foo via var' )
set $S1,"bar"
set $S0,$P0[$S1]
is( $S0,"qux", 'lookup str in bar via var' )
.end
# So far, we have only used INTVALs, FLOATVALs and STRINGs as values
# and/or keys. Now we try PMCs.
.sub setting_and_getting_scalar_pmcs
new $P0, ['Hash']
new $P1, ['Integer']
new $P2, ['Integer']
set $S0, "non-PMC key"
set $P1, 10
set $P0[$S0], $P1
set $P2, $P0[$S0]
is( $P2, $P1, 'lookup PMC Integer' )
set $P1, -1234.000000
set $P0[$S0], $P1
set $P2, $P0[$S0]
is( $P2, $P1, 'lookup num after PMC Integer in slot' )
set $P1, "abcdefghijklmnopq"
set $P0[$S0], $P1
set $P2, $P0[$S0]
is( $P2, $P1, 'lookup string' )
new $P1, ['Undef']
set $P0[$S0], $P1
set $P2, $P0[$S0]
typeof $S1, $P2
is( $S1, "Undef", 'lookup Undef PMC' )
.end
.sub setting_scalar_pmcs_and_getting_scalar_values
new $P0, ['Hash']
new $P1, ['Integer']
set $S0, "A rather large key"
set $I0, 10
set $P1, $I0
set $P0[$S0], $P1
set $I1, $P0[$S0]
is( $I1, $I0, 'lookup PMC and get scalar Int' )
set $N0, -1234.000000
set $P1, $N0
set $P0[$S0], $P1
set $N1, $P0[$S0]
is( $N1, $N0, 'lookup PMC and get scalar Num' )
set $S1, "abcdefghijklmnopq"
set $P1, $S1
set $P0[$S0], $P1
set $S2, $P0[$S0]
is( $S2, $S1, 'lookup PMC and get scalar Str' )
.end
.sub getting_values_from_undefined_keys
new $P2, ['Hash']
set $I0, $P2["qwerty"]
set $N0, $P2["asdfgh"]
set $S0, $P2["zxcvbn"]
set $P0, $P2["123456"]
is( $I0, 0, 'undefined key returns Int 0' )
is( $N0, 0.0, 'undefined key returns Num 0.0' )
is( $S0, "", 'undefined key returns Str ""' )
$I1 = 1
if_null $P0, P0_is_null
$I1 = 0
P0_is_null:
ok( $I1, 'undefined key returns null PMC' )
.end
.sub setting_and_getting_non_scalar_pmcs
new $P0, ['Hash']
new $P1, ['ResizablePMCArray']
new $P2, ['ResizablePMCArray']
set $P1[4],"string"
set $P0["one"],$P1
set $P2,$P0["one"]
set $S0,$P2[4]
is( $S0, 'string', 'set and get non-scalar PMCs' )
.end
.sub testing_clone
new $P0, ['Hash']
set $S0, "a"
set $P0[$S0], $S0
new $P2, ['ResizablePMCArray']
set $P2, 2
set $P0["b"], $P2
# $P0 = { a => "a", b => [undef, undef] }
clone $P1, $P0
set $P0["c"], 4
set $P3, $P0["b"]
set $P3, 3
set $P0["b"], $P3
set $P1["a"], "A"
# $P0 = { a => "a", b => [undef, undef, undef], c => 4 }
# $P1 = { a => "A", b => [undef, undef] }
set $S0, $P0["a"]
is( $S0, "a", 'original hash lookup pre-clone value' )
set $P5, $P0["b"]
set $I0, $P5
is( $I0, 3, 'original hash lookup post-clone value' )
set $I0, $P0["c"]
is( $I0, 4, 'original hash lookup post-clone value in new slot' )
set $S0, $P1["a"]
is( $S0, "A", 'cloned hash lookup post-clone value' )
set $P5, $P1["b"]
set $I0, $P5
is( $I0, 2, 'cloned hash lookup pre-clone complex value' )
# XXX: this should return undef or something, but it dies instead.
# set $P3, $P0["c"]
# unless $P3, ok6
# print "not "
# ok6:
# print "ok 6\n"
.end
.sub clone_doesnt_crash_on_deleted_keys
.local pmc hash1, hash2
.local string key1, key2
hash1 = new 'Hash'
key1 = 'foo'
key2 = 'bar'
hash1[key1] = 1
hash1[key2] = 2
delete hash1[key1]
hash2 = clone hash1
ok( 1, "clone doesn't crash on deleted keys" )
.end
# TT #116
# This test failure depends on the value if the hash seed, which is randomized.
# To try to ensure that the test fails reliably if there's a regression, it's
# run 3 times with different hash keys.
.sub clone_preserves_order
.local pmc h, cloned
.local string s1, s2
.local int all_ok
all_ok = 1
h = new ['Hash']
h['a'] = 1
h['b'] = 2
h['c'] = 3
h['d'] = 4
h['e'] = 5
h['f'] = 6
h['g'] = 7
h['h'] = 8
h['i'] = 9
h['j'] = 10
h['k'] = 11
h['l'] = 12
cloned = clone h
#If the bug is present, the order of elements in the get_repr string will
#be different.
s1 = get_repr h
s2 = get_repr cloned
if s1 != s2 goto fail
h = new ['Hash']
h['aa'] = 1
h['bb'] = 2
h['cc'] = 3
h['dd'] = 4
h['ee'] = 5
h['ff'] = 6
h['gg'] = 7
h['hh'] = 8
h['ii'] = 9
h['jj'] = 10
h['kk'] = 11
h['ll'] = 12
cloned = clone h
s1 = get_repr h
s2 = get_repr cloned
if s1 != s2 goto fail
h = new ['Hash']
h['one'] = 1
h['two'] = 2
h['three'] = 3
h['four'] = 4
h['five'] = 5
h['six'] = 6
h['seven'] = 7
h['eight'] = 8
h['nine'] = 9
h['ten'] = 10
h['eleven'] = 11
h['twelve'] = 12
cloned = clone h
s1 = get_repr h
s2 = get_repr cloned
if s1 != s2 goto fail
goto end
fail:
all_ok = 0
end:
ok(all_ok, "clone preserves hash internal order")
.end
.sub freeze_thaw_preserves_order
.local pmc h, cloned
.local string s1, s2
.local int all_ok
all_ok = 1
h = new ['Hash']
h['a'] = 1
h['b'] = 2
h['c'] = 3
h['d'] = 4
h['e'] = 5
h['f'] = 6
h['g'] = 7
h['h'] = 8
h['i'] = 9
h['j'] = 10
h['k'] = 11
h['l'] = 12
$S0 = freeze h
cloned = thaw $S0
s1 = get_repr h
s2 = get_repr cloned
if s1 != s2 goto fail
h = new ['Hash']
h['aa'] = 1
h['bb'] = 2
h['cc'] = 3
h['dd'] = 4
h['ee'] = 5
h['ff'] = 6
h['gg'] = 7
h['hh'] = 8
h['ii'] = 9
h['jj'] = 10
h['kk'] = 11
h['ll'] = 12
$S0 = freeze h
cloned = thaw $S0
s1 = get_repr h
s2 = get_repr cloned
if s1 != s2 goto fail
h = new ['Hash']
h['one'] = 1
h['two'] = 2
h['three'] = 3
h['four'] = 4
h['five'] = 5
h['six'] = 6
h['seven'] = 7
h['eight'] = 8
h['nine'] = 9
h['ten'] = 10
h['eleven'] = 11
h['twelve'] = 12
$S0 = freeze h
cloned = thaw $S0
s1 = get_repr h
s2 = get_repr cloned
if s1 != s2 goto fail
goto end
fail:
all_ok = 0
end:
ok(all_ok, "freeze/thaw preserves hash internal order")
.end
.sub compound_keys
new $P0, ['Hash']
new $P1, ['Hash']
new $P2, ['ResizablePMCArray']
set $P1["b"], "ab"
set $P0["a"], $P1
set $S0, $P0["a";"b"]
is( $S0, "ab", 'Str from compound key' )
set $P2[20], 77
set $P1["n"], $P2
set $I0, $P0["a";"n";20]
is( $I0, 77, 'Int from compound key^2' )
set $S0, "a"
set $S1, "n"
set $I0, 20
set $I0, $P0[$S0;$S1;$I0]
is( $I0, 77, 'Int from indirect compound key^2' )
set $P0["c"], $P2
set $P2[33], $P1
set $S0, $P0["c";33;"b"]
is( $S0, "ab", 'Str from indirect/direct compound key^2' )
set $S0, "c"
set $I1, 33
set $S2, "b"
set $S0, $P0[$S0;$I1;$S2]
is( $S0, "ab", 'Str from indirect compound key^2' )
set $P1["b"], 47.11
set $N0, $P0["c";$I1;$S2]
is( $N0, 47.11, 'Num from indirect compound key^2' )
.end
.sub getting_pmcs_from_compound_keys
new $P0, ['Hash']
new $P1, ['Hash']
new $P2, ['Integer']
set $P2, 12
set $P1["b"], $P2
set $P0["a"], $P1
set $P3, $P0["a";"b"]
set $S0, $P3
is( $S0, "12", "lookup PMC from compound key" )
.end
# 12
.sub getting_pmcs_from_string_int_compound_keys
new $P0, ['Hash']
new $P1, ['Hash']
new $P2, ['Integer']
set $P2, 4
set $P1[9], $P2
set $I0, $P1[9]
is( $I0, 4, 'lookup Int PMC from hash' )
set $P0["a"], $P1
set $I0, $P0["a";9]
is( $I0, 4, 'lookup Inc PMC from compound hash' )
.end
# A hash is only false if it has size 0
.sub if_hash
new $P0, ['Hash']
## Could just use Test::More tests directly, but then we are really
## checking casting to Int then testing value (I think)
## ie. ok( $P0, '...' )
$I1 = 0
if $P0, L1
$I1 = 1
L1:
ok( $I1, 'Empty hash is false' )
set $P0["key"], "value"
$I1 = 1
if $P0, L2
$I1 = 0
L2:
ok( $I1, 'Hash with one slot is true' )
set $P0["key"], ""
$I1 = 1
if $P0, L3
$I1 = 0
L3:
ok( $I1, 'Hash with one value ("") is true' )
new $P1, ['Undef']
set $P0["key"], $P1
$I1 = 1
if $P0, L4
$I1 = 0
L4:
ok( $P0, 'Hash with one value (Undef PMC) is true' )
.end
.sub unless_hash
new $P0, ['Hash']
$I0 = 1
unless $P0, L1
$I0 = 0
L1:
ok( $I0, 'Empty hash is false in unless' )
$I0 = 0
set $P0["key"], "value"
unless $P0, L2
$I0 = 1
L2:
ok( $I0, 'Hash with one value is true' )
$I0 = 0
set $P0["key"], "\0"
unless $P0, L3
$I0 = 1
L3:
ok( $I0, 'Hash with one value ("\0") is true' )
$I0 = 0
new $P1, ['Undef']
set $P0["key"], $P1
unless $P0, L4
$I0 = 1
L4:
ok( $I0, 'Hash with one value (Undef PMC) is true' )
.end
.sub defined_hash
new $P0, ['Hash']
defined $I0, $P0
ok( $I0, 'Empty has is defined' )
## nok() had not been (correctly) implemented when this test was written
defined $I0, $P1
$I0 = not $I0
ok( $I0, 'Unassigned var is undefined' )
set $P0["a"], 1
defined $I0, $P0["a"]
ok( $I0, 'Int in hash value is defined' )
defined $I0, $P0["b"]
$I0 = not $I0
ok( $I0, 'Unassigned hash slot is undefined' )
new $P1, ['Undef']
set $P0["c"], $P1
defined $I0, $P0["c"]
$I0 = not $I0
ok( $I0, 'Undef PMC in hash slot is undefined' )
.end
.sub exists_hash_key
new $P0, ['Hash']
set $P0["a"], 1
exists $I0, $P0["a"]
ok( $I0, 'assigned hash key exists' )
exists $I0, $P0["b"]
$I0 = not $I0
ok( $I0, 'unassigned hash key does not exist' )
new $P1, ['Undef']
set $P0["c"], $P1
exists $I0, $P0["c"]
ok( $I0, 'hash key assigned Undef PMC exists' )
.end
.sub delete_hash_key
new $P0, ['Hash']