1#!/usr/bin/env perl
2
3no strict 'refs';
4use warnings;
5use Getopt::Long;
6Getopt::Long::Configure("auto_help");
7
8my %ALL_FUNCS = ();
9my @ALL_ARCHS;
10my @ALL_FORWARD_DECLS;
11my @REQUIRES;
12
13my %opts = ();
14my %disabled = ();
15my %required = ();
16
17my @argv;
18foreach (@ARGV) {
19  $disabled{$1} = 1, next if /--disable-(.*)/;
20  $required{$1} = 1, next if /--require-(.*)/;
21  push @argv, $_;
22}
23
24# NB: use GetOptions() instead of GetOptionsFromArray() for compatibility.
25@ARGV = @argv;
26GetOptions(
27  \%opts,
28  'arch=s',
29  'sym=s',
30  'config=s',
31);
32
33foreach my $opt (qw/arch config/) {
34  if (!defined($opts{$opt})) {
35    warn "--$opt is required!\n";
36    Getopt::Long::HelpMessage('-exit' => 1);
37  }
38}
39
40foreach my $defs_file (@ARGV) {
41  if (!-f $defs_file) {
42    warn "$defs_file: $!\n";
43    Getopt::Long::HelpMessage('-exit' => 1);
44  }
45}
46
47open CONFIG_FILE, $opts{config} or
48  die "Error opening config file '$opts{config}': $!\n";
49
50my %config = ();
51while (<CONFIG_FILE>) {
52  next if !/^CONFIG_/;
53  chomp;
54  my @pair = split /=/;
55  $config{$pair[0]} = $pair[1];
56}
57close CONFIG_FILE;
58
59#
60# Routines for the RTCD DSL to call
61#
62sub vpx_config($) {
63  return (defined $config{$_[0]}) ? $config{$_[0]} : "";
64}
65
66sub specialize {
67  my $fn=$_[0];
68  shift;
69  foreach my $opt (@_) {
70    eval "\$${fn}_${opt}=${fn}_${opt}";
71  }
72}
73
74sub add_proto {
75  my $fn = splice(@_, -2, 1);
76  $ALL_FUNCS{$fn} = \@_;
77  specialize $fn, "c";
78}
79
80sub require {
81  foreach my $fn (keys %ALL_FUNCS) {
82    foreach my $opt (@_) {
83      my $ofn = eval "\$${fn}_${opt}";
84      next if !$ofn;
85
86      # if we already have a default, then we can disable it, as we know
87      # we can do better.
88      my $best = eval "\$${fn}_default";
89      if ($best) {
90        my $best_ofn = eval "\$${best}";
91        if ($best_ofn && "$best_ofn" ne "$ofn") {
92          eval "\$${best}_link = 'false'";
93        }
94      }
95      eval "\$${fn}_default=${fn}_${opt}";
96      eval "\$${fn}_${opt}_link='true'";
97    }
98  }
99}
100
101sub forward_decls {
102  push @ALL_FORWARD_DECLS, @_;
103}
104
105#
106# Include the user's directives
107#
108foreach my $f (@ARGV) {
109  open FILE, "<", $f or die "cannot open $f: $!\n";
110  my $contents = join('', <FILE>);
111  close FILE;
112  eval $contents or warn "eval failed: $@\n";
113}
114
115#
116# Process the directives according to the command line
117#
118sub process_forward_decls() {
119  foreach (@ALL_FORWARD_DECLS) {
120    $_->();
121  }
122}
123
124sub determine_indirection {
125  vpx_config("CONFIG_RUNTIME_CPU_DETECT") eq "yes" or &require(@ALL_ARCHS);
126  foreach my $fn (keys %ALL_FUNCS) {
127    my $n = "";
128    my @val = @{$ALL_FUNCS{$fn}};
129    my $args = pop @val;
130    my $rtyp = "@val";
131    my $dfn = eval "\$${fn}_default";
132    $dfn = eval "\$${dfn}";
133    foreach my $opt (@_) {
134      my $ofn = eval "\$${fn}_${opt}";
135      next if !$ofn;
136      my $link = eval "\$${fn}_${opt}_link";
137      next if $link && $link eq "false";
138      $n .= "x";
139    }
140    if ($n eq "x") {
141      eval "\$${fn}_indirect = 'false'";
142    } else {
143      eval "\$${fn}_indirect = 'true'";
144    }
145  }
146}
147
148sub declare_function_pointers {
149  foreach my $fn (sort keys %ALL_FUNCS) {
150    my @val = @{$ALL_FUNCS{$fn}};
151    my $args = pop @val;
152    my $rtyp = "@val";
153    my $dfn = eval "\$${fn}_default";
154    $dfn = eval "\$${dfn}";
155    foreach my $opt (@_) {
156      my $ofn = eval "\$${fn}_${opt}";
157      next if !$ofn;
158      print "$rtyp ${ofn}($args);\n";
159    }
160    if (eval "\$${fn}_indirect" eq "false") {
161      print "#define ${fn} ${dfn}\n";
162    } else {
163      print "RTCD_EXTERN $rtyp (*${fn})($args);\n";
164    }
165    print "\n";
166  }
167}
168
169sub set_function_pointers {
170  foreach my $fn (sort keys %ALL_FUNCS) {
171    my @val = @{$ALL_FUNCS{$fn}};
172    my $args = pop @val;
173    my $rtyp = "@val";
174    my $dfn = eval "\$${fn}_default";
175    $dfn = eval "\$${dfn}";
176    if (eval "\$${fn}_indirect" eq "true") {
177      print "    $fn = $dfn;\n";
178      foreach my $opt (@_) {
179        my $ofn = eval "\$${fn}_${opt}";
180        next if !$ofn;
181        next if "$ofn" eq "$dfn";
182        my $link = eval "\$${fn}_${opt}_link";
183        next if $link && $link eq "false";
184        my $cond = eval "\$have_${opt}";
185        print "    if (${cond}) $fn = $ofn;\n"
186      }
187    }
188  }
189}
190
191sub filter {
192  my @filtered;
193  foreach (@_) { push @filtered, $_ unless $disabled{$_}; }
194  return @filtered;
195}
196
197#
198# Helper functions for generating the arch specific RTCD files
199#
200sub common_top() {
201  my $include_guard = uc($opts{sym})."_H_";
202  print <<EOF;
203#ifndef ${include_guard}
204#define ${include_guard}
205
206#ifdef RTCD_C
207#define RTCD_EXTERN
208#else
209#define RTCD_EXTERN extern
210#endif
211
212#ifdef __cplusplus
213extern "C" {
214#endif
215
216EOF
217
218process_forward_decls();
219print "\n";
220declare_function_pointers("c", @ALL_ARCHS);
221
222print <<EOF;
223void $opts{sym}(void);
224
225EOF
226}
227
228sub common_bottom() {
229  print <<EOF;
230
231#ifdef __cplusplus
232}  // extern "C"
233#endif
234
235#endif
236EOF
237}
238
239sub x86() {
240  determine_indirection("c", @ALL_ARCHS);
241
242  # Assign the helper variable for each enabled extension
243  foreach my $opt (@ALL_ARCHS) {
244    my $opt_uc = uc $opt;
245    eval "\$have_${opt}=\"flags & HAS_${opt_uc}\"";
246  }
247
248  common_top;
249  print <<EOF;
250#ifdef RTCD_C
251#include "vpx_ports/x86.h"
252static void setup_rtcd_internal(void)
253{
254    int flags = x86_simd_caps();
255
256    (void)flags;
257
258EOF
259
260  set_function_pointers("c", @ALL_ARCHS);
261
262  print <<EOF;
263}
264#endif
265EOF
266  common_bottom;
267}
268
269sub arm() {
270  determine_indirection("c", @ALL_ARCHS);
271
272  # Assign the helper variable for each enabled extension
273  foreach my $opt (@ALL_ARCHS) {
274    my $opt_uc = uc $opt;
275    eval "\$have_${opt}=\"flags & HAS_${opt_uc}\"";
276  }
277
278  common_top;
279  print <<EOF;
280#include "vpx_config.h"
281
282#ifdef RTCD_C
283#include "vpx_ports/arm.h"
284static void setup_rtcd_internal(void)
285{
286    int flags = arm_cpu_caps();
287
288    (void)flags;
289
290EOF
291
292  set_function_pointers("c", @ALL_ARCHS);
293
294  print <<EOF;
295}
296#endif
297EOF
298  common_bottom;
299}
300
301sub mips() {
302  determine_indirection("c", @ALL_ARCHS);
303  common_top;
304
305  print <<EOF;
306#include "vpx_config.h"
307
308#ifdef RTCD_C
309static void setup_rtcd_internal(void)
310{
311EOF
312
313  set_function_pointers("c", @ALL_ARCHS);
314
315  print <<EOF;
316#if HAVE_DSPR2
317#if CONFIG_VP8
318void dsputil_static_init();
319dsputil_static_init();
320#endif
321#if CONFIG_VP9
322void vp9_dsputil_static_init();
323vp9_dsputil_static_init();
324#endif
325#endif
326}
327#endif
328EOF
329  common_bottom;
330}
331
332sub unoptimized() {
333  determine_indirection "c";
334  common_top;
335  print <<EOF;
336#include "vpx_config.h"
337
338#ifdef RTCD_C
339static void setup_rtcd_internal(void)
340{
341EOF
342
343  set_function_pointers "c";
344
345  print <<EOF;
346}
347#endif
348EOF
349  common_bottom;
350}
351
352#
353# Main Driver
354#
355
356&require("c");
357if ($opts{arch} eq 'x86') {
358  @ALL_ARCHS = filter(qw/mmx sse sse2 sse3 ssse3 sse4_1 avx avx2/);
359  x86;
360} elsif ($opts{arch} eq 'x86_64') {
361  @ALL_ARCHS = filter(qw/mmx sse sse2 sse3 ssse3 sse4_1 avx avx2/);
362  @REQUIRES = filter(keys %required ? keys %required : qw/mmx sse sse2/);
363  &require(@REQUIRES);
364  x86;
365} elsif ($opts{arch} eq 'mips32') {
366  @ALL_ARCHS = filter(qw/mips32/);
367  open CONFIG_FILE, $opts{config} or
368    die "Error opening config file '$opts{config}': $!\n";
369  while (<CONFIG_FILE>) {
370    if (/HAVE_DSPR2=yes/) {
371      @ALL_ARCHS = filter(qw/mips32 dspr2/);
372      last;
373    }
374  }
375  close CONFIG_FILE;
376  mips;
377} elsif ($opts{arch} eq 'armv5te') {
378  @ALL_ARCHS = filter(qw/edsp/);
379  arm;
380} elsif ($opts{arch} eq 'armv6') {
381  @ALL_ARCHS = filter(qw/edsp media/);
382  arm;
383} elsif ($opts{arch} eq 'armv7') {
384  @ALL_ARCHS = filter(qw/edsp media neon/);
385  arm;
386} else {
387  unoptimized;
388}
389
390__END__
391
392=head1 NAME
393
394rtcd -
395
396=head1 SYNOPSIS
397
398Usage: rtcd.pl [options] FILE
399
400See 'perldoc rtcd.pl' for more details.
401
402=head1 DESCRIPTION
403
404Reads the Run Time CPU Detections definitions from FILE and generates a
405C header file on stdout.
406
407=head1 OPTIONS
408
409Options:
410  --arch=ARCH       Architecture to generate defs for (required)
411  --disable-EXT     Disable support for EXT extensions
412  --require-EXT     Require support for EXT extensions
413  --sym=SYMBOL      Unique symbol to use for RTCD initialization function
414  --config=FILE     File with CONFIG_FOO=yes lines to parse
415