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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
#!perl -w
use strict;
use Pod::Usage;
use Getopt::Std;
$Getopt::Std::STANDARD_HELP_VERSION = 1;
my $trysource = "try.c";
my $tryout = "try.i";
getopts('fF:ekvI:', \my %opt) or pod2usage();
my($expr, @headers) = @ARGV ? splice @ARGV : "-";
pod2usage "-f and -F <tool> are exclusive\n" if $opt{f} and $opt{F};
foreach($trysource, $tryout) {
unlink $_ if $opt{e};
die "You already have a $_" if -e $_;
}
if ($expr eq '-') {
warn "reading from stdin...\n";
$expr = do { local $/; <> };
}
my($macro, $args) = $expr =~ /^\s*(\w+)((?:\s*\(.*\))?)\s*;?\s*$/s
or pod2usage "$expr doesn't look like a macro-name or macro-expression to me";
if (!(@ARGV = @headers)) {
open my $fh, '<', 'MANIFEST' or die "Can't open MANIFEST: $!";
while (<$fh>) {
push @ARGV, $1 if m!^([^/]+\.h)\t!;
}
push @ARGV, 'config.h' if -f 'config.h';
}
my $header;
while (<>) {
next unless /^#\s*define\s+$macro\b/;
my ($def_args) = /^#\s*define\s+$macro\(([^)]*)\)/;
if (defined $def_args && !$args) {
my @args = split ',', $def_args;
print "# macro: $macro args: @args in $_\n" if $opt{v};
my $argname = "A0";
$args = '(' . join (', ', map {$argname++} 1..@args) . ')';
}
$header = $ARGV;
last;
}
die "$macro not found\n" unless defined $header;
open my $out, '>', $trysource or die "Can't open $trysource: $!";
my $sentinel = "$macro expands to";
print $out <<"EOF";
#include "EXTERN.h"
#include "perl.h"
EOF
print qq{#include "$header"\n}
unless $header eq 'perl.h' or $header eq 'EXTERN.h';
print $out <<"EOF";
#line 4 "$sentinel"
$macro$args
EOF
close $out or die "Can't close $trysource: $!";
print "doing: make $tryout\n" if $opt{v};
system "make $tryout" and die;
# if user wants 'indent' formatting ..
my $out_fh;
if ($opt{f} || $opt{F}) {
# a: indent is a well behaved filter when given 0 arguments, reading from
# stdin and writing to stdout
# b: all our braces should be balanced, indented back to column 0, in the
# headers, hence everything before our #line directive can be ignored
#
# We can take advantage of this to reduce the work to indent.
my $indent_command = $opt{f} ? 'indent' : $opt{F};
if (defined $opt{I}) {
$indent_command .= " $opt{I}";
}
open $out_fh, '|-', $indent_command or die $?;
} else {
$out_fh = \*STDOUT;
}
open my $fh, '<', $tryout or die "Can't open $tryout: $!";
while (<$fh>) {
print $out_fh $_ if /$sentinel/o .. 1;
}
unless ($opt{k}) {
foreach($trysource, $tryout) {
die "Can't unlink $_" unless unlink $_;
}
}
__END__
=head1 NAME
expand-macro.pl - expand C macros using the C preprocessor
=head1 SYNOPSIS
expand-macro.pl [options] [ < macro-name | macro-expression | - > [headers] ]
options:
-f use 'indent' to format output
-F <tool> use <tool> to format output (instead of -f)
-e erase try.[ic] instead of failing when they're present (errdetect)
-k keep them after generating (for handy inspection)
-v verbose
-I <indent-opts> passed into indent
=cut
|
