1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
package CType::Structural;
# Common functions for all structural types
use 5.6.0;
use strict;
use warnings;
use CType::Fundamental qw/compare_ord/;
sub alignment_exprs
{
my $self = shift;
return @{$self->{alignment_exprs}};
}
sub compute_alignment
{
my $self = shift;
my $alignment = 1;
foreach my $a ($self->alignment_exprs)
{
my $n = $a->compute;
if (not defined $alignment or $alignment < $n)
{
$alignment = $n;
}
}
return $alignment;
}
sub add_alignment
{
my $self = shift;
my $new = shift;
my @alignment;
# We special-case the handling of explicit integer alignment
if ($new->isa('CExpr::Integer'))
{
foreach my $a ($self->alignment_exprs)
{
if ($a->isa('CExpr::Integer'))
{
# Integer values are compared numerically
if ($new->compute > $a->compute)
{
# Discard the current value in favour of the new one
next;
}
else
{
# Discard the new value in favour of the current one
return;
}
}
else
{
# Integer values ignore non-integer ones
push @alignment, $a;
}
}
unshift @alignment, $new;
$self->{alignment_exprs} = \@alignment;
return;
}
foreach my $a ($self->alignment_exprs)
{
if ($new->isa('CExpr::Integer') and $a->isa('CExpr::Integer'))
{
# Integer values are compared numerically
if ($new->compute > $a->compute)
{
# Discard the current value in favour of the new one
next;
}
else
{
# Discard the new value in favour of the current one
return;
}
}
my $c = compare_ord($a, $new);
if (defined $c and ($c == 1 or $c == 0))
{
# There is already an alignment listed which is ordinally
# greater or equal, so we don't need to add this one
return;
}
if (defined $c and ($c == -1))
{
# This alignment is ordinally greater than one which is
# currently listed, so we dump the current one in favour
# of this one
next;
}
push @alignment, $a;
}
push @alignment, $new;
$self->{alignment_exprs} = \@alignment;
}
1;
|
