add ax88772_rst

hc

2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29

 kernel/scripts/generate_initcall_order.pl
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..
@@ -8,22 +8,22 @@
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 use strict;
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 use warnings;
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 use IO::Handle;
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+use IO::Select;
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+use POSIX ":sys_wait_h";
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13
 
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-my $nm = $ENV{'LLVM_NM'} || "llvm-nm";
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-my $ar = $ENV{'AR'}	 || "llvm-ar";
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-my $objtree = $ENV{'objtree'} || ".";
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+my $nm = $ENV{'NM'} || die "$0: ERROR: NM not set?";
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+my $objtree = $ENV{'objtree'} || '.';
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16
 
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-## list of all object files to process, in link order
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-my @objects;
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 ## currently active child processes
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 my $jobs = {};		# child process pid -> file handle
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19
 ## results from child processes
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-my $results = {};	# object index -> { level, function }
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+my $results = {};	# object index -> [ { level, secname }, ... ]
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21
 
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-## reads _NPROCESSORS_ONLN to determine the number of processes to start
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+## reads _NPROCESSORS_ONLN to determine the maximum number of processes to
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+## start
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 sub get_online_processors {
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 	open(my $fh, "getconf _NPROCESSORS_ONLN 2>/dev/null |")
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-		or die "$0: failed to execute getconf: $!";
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+		or die "$0: ERROR: failed to execute getconf: $!";
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 	my $procs = <$fh>;
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 	close($fh);
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29
 
..
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@@ -34,217 +34,237 @@
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 	return int($procs);
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 }
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-## finds initcalls defined in an object file, parses level and function name,
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-## and prints it out to the parent process
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+## writes results to the parent process
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+## format: <file index> <initcall level> <base initcall section name>
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+sub write_results {
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+	my ($index, $initcalls) = @_;
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+
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+	# sort by the counter value to ensure the order of initcalls within
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+	# each object file is correct
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+	foreach my $counter (sort { $a <=> $b } keys(%{$initcalls})) {
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+		my $level = $initcalls->{$counter}->{'level'};
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+
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+		# section name for the initcall function
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+		my $secname = $initcalls->{$counter}->{'module'} . '__' .
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+			      $counter . '_' .
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+			      $initcalls->{$counter}->{'line'} . '_' .
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+			      $initcalls->{$counter}->{'function'};
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+
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+		print "$index $level $secname\n";
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+	}
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+}
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+
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+## reads a result line from a child process and adds it to the $results array
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+sub read_results{
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+	my ($fh) = @_;
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+
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+	# each child prints out a full line w/ autoflush and exits after the
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+	# last line, so even if buffered I/O blocks here, it shouldn't block
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+	# very long
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+	my $data = <$fh>;
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+
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+	if (!defined($data)) {
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+		return 0;
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+	}
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+
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+	chomp($data);
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+
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+	my ($index, $level, $secname) = $data =~
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+		/^(\d+)\ ([^\ ]+)\ (.*)$/;
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+
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+	if (!defined($index) ||
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+		!defined($level) ||
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+		!defined($secname)) {
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+		die "$0: ERROR: child process returned invalid data: $data\n";
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+	}
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+
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+	$index = int($index);
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+
83
+	if (!exists($results->{$index})) {
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+		$results->{$index} = [];
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+	}
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+
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+	push (@{$results->{$index}}, {
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+		'level'   => $level,
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+		'secname' => $secname
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+	});
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+
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+	return 1;
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+}
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+
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+## finds initcalls from an object file or all object files in an archive, and
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+## writes results back to the parent process
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 sub find_initcalls {
40
-	my ($object) = @_;
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+	my ($index, $file) = @_;
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99
 
42
-	die "$0: object file $object doesn't exist?" if (! -f $object);
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+	die "$0: ERROR: file $file doesn't exist?" if (! -f $file);
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101
 
44
-	open(my $fh, "\"$nm\" --just-symbol-name --defined-only \"$object\" 2>/dev/null |")
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-		or die "$0: failed to execute \"$nm\": $!";
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+	open(my $fh, "\"$nm\" --defined-only \"$file\" 2>/dev/null |")
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+		or die "$0: ERROR: failed to execute \"$nm\": $!";
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104
 
47
105
 	my $initcalls = {};
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106
 
49
107
 	while (<$fh>) {
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 		chomp;
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109
 
52
-		my ($counter, $line, $symbol) = $_ =~ /^__initcall_(\d+)_(\d+)_(.*)$/;
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+		# check for the start of a new object file (if processing an
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+		# archive)
112
+		my ($path)= $_ =~ /^(.+)\:$/;
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113
 
54
-		if (!defined($counter) || !defined($line) || !defined($symbol)) {
114
+		if (defined($path)) {
115
+			write_results($index, $initcalls);
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+			$initcalls = {};
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117
 			next;
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118
 		}
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119
 
58
-		my ($function, $level) = $symbol =~
59
-			/^(.*)((early|rootfs|con|security|[0-9])s?)$/;
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+		# look for an initcall
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+		my ($module, $counter, $line, $symbol) = $_ =~
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+			/[a-z]\s+__initcall__(\S*)__(\d+)_(\d+)_(.*)$/;
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123
 
61
-		die "$0: duplicate initcall counter value in object $object: $_"
62
-			if exists($initcalls->{$counter});
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+		if (!defined($module)) {
125
+			$module = ''
126
+		}
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+
128
+		if (!defined($counter) ||
129
+			!defined($line) ||
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+			!defined($symbol)) {
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+			next;
132
+		}
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+
134
+		# parse initcall level
135
+		my ($function, $level) = $symbol =~
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+			/^(.*)((early|rootfs|con|[0-9])s?)$/;
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+
138
+		die "$0: ERROR: invalid initcall name $symbol in $file($path)"
139
+			if (!defined($function) || !defined($level));
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140
 
64
141
 		$initcalls->{$counter} = {
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-			'level'    => $level,
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+			'module'   => $module,
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143
 			'line'     => $line,
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-			'function' => $function
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+			'function' => $function,
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+			'level'    => $level,
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146
 		};
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147
 	}
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148
 
71
149
 	close($fh);
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-
73
-	# sort initcalls in each object file numerically by the counter value
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-	# to ensure they are in the order they were defined
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-	foreach my $counter (sort { $a <=> $b } keys(%{$initcalls})) {
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-		print $initcalls->{$counter}->{"level"} . " " .
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-		      $counter . " " .
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-		      $initcalls->{$counter}->{"line"} . " " .
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-		      $initcalls->{$counter}->{"function"} . "\n";
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-	}
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+	write_results($index, $initcalls);
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151
 }
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152
 
83
153
 ## waits for any child process to complete, reads the results, and adds them to
84
154
 ## the $results array for later processing
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 sub wait_for_results {
86
-	my $pid = wait();
87
-	if ($pid > 0) {
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-		my $fh = $jobs->{$pid};
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+	my ($select) = @_;
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157
 
90
-		# the child process prints out results in the following format:
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-		#  line 1:    <object file index>
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-		#  line 2..n: <level> <counter> <line> <function>
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-
94
-		my $index = <$fh>;
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-		chomp($index);
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-
97
-		if (!($index =~ /^\d+$/)) {
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-			die "$0: child $pid returned an invalid index: $index";
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-		}
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-		$index = int($index);
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-
102
-		while (<$fh>) {
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-			chomp;
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-			my ($level, $counter, $line, $function) = $_ =~
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-				/^([^\ ]+)\ (\d+)\ (\d+)\ (.*)$/;
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-
107
-			if (!defined($level) ||
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-				!defined($counter) ||
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-				!defined($line) ||
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-				!defined($function)) {
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-				die "$0: child $pid returned invalid data";
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-			}
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-
114
-			if (!exists($results->{$index})) {
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-				$results->{$index} = [];
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-			}
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-
118
-			push (@{$results->{$index}}, {
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-				'level'    => $level,
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-				'counter'  => $counter,
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-				'line'     => $line,
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-				'function' => $function
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-			});
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+	my $pid = 0;
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+	do {
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+		# unblock children that may have a full write buffer
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+		foreach my $fh ($select->can_read(0)) {
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+			read_results($fh);
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163
 		}
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164
 
126
-		close($fh);
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-		delete($jobs->{$pid});
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-	}
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+		# check for children that have exited, read the remaining data
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+		# from them, and clean up
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+		$pid = waitpid(-1, WNOHANG);
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+		if ($pid > 0) {
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+			if (!exists($jobs->{$pid})) {
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+				next;
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+			}
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+
173
+			my $fh = $jobs->{$pid};
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+			$select->remove($fh);
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+
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+			while (read_results($fh)) {
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+				# until eof
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+			}
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+
180
+			close($fh);
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+			delete($jobs->{$pid});
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+		}
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+	} while ($pid > 0);
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184
 }
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185
 
131
-## launches child processes to find initcalls from the object files, waits for
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-## each process to complete and collects the results
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-sub process_objects {
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-	my $index = 0;	# link order index of the object file
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-	my $njobs = get_online_processors();
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+## forks a child to process each file passed in the command line and collects
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+## the results
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+sub process_files {
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+	my $index = 0;
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+	my $njobs = $ENV{'PARALLELISM'} || get_online_processors();
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+	my $select = IO::Select->new();
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192
 
137
-	while (scalar(@objects) > 0) {
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-		my $object = shift(@objects);
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-
193
+	while (my $file = shift(@ARGV)) {
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 		# fork a child process and read it's stdout
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195
 		my $pid = open(my $fh, '-|');
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196
 
143
197
 		if (!defined($pid)) {
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-			die "$0: failed to fork: $!";
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+			die "$0: ERROR: failed to fork: $!";
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199
 		} elsif ($pid) {
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200
 			# save the child process pid and the file handle
201
+			$select->add($fh);
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 			$jobs->{$pid} = $fh;
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203
 		} else {
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+			# in the child process
149
205
 			STDOUT->autoflush(1);
150
-			print "$index\n";
151
-			find_initcalls("$objtree/$object");
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+			find_initcalls($index, "$objtree/$file");
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207
 			exit;
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208
 		}
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209
 
155
210
 		$index++;
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211
 
157
-		# if we reached the maximum number of processes, wait for one
158
-		# to complete before launching new ones
159
-		if (scalar(keys(%{$jobs})) >= $njobs && scalar(@objects) > 0) {
160
-			wait_for_results();
212
+		# limit the number of children to $njobs
213
+		if (scalar(keys(%{$jobs})) >= $njobs) {
214
+			wait_for_results($select);
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215
 		}
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216
 	}
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217
 
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218
 	# wait for the remaining children to complete
165
219
 	while (scalar(keys(%{$jobs})) > 0) {
166
-		wait_for_results();
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+		wait_for_results($select);
167
221
 	}
168
222
 }
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223
 
170
-## gets a list of actual object files from thin archives, and adds them to
171
-## @objects in link order
172
-sub find_objects {
173
-	while (my $file = shift(@ARGV)) {
174
-		my $pid = open (my $fh, "\"$ar\" t \"$file\" 2>/dev/null |")
175
-			or die "$0: failed to execute $ar: $!";
224
+sub generate_initcall_lds() {
225
+	process_files();
176
226
 
177
-		my @output;
227
+	my $sections = {};	# level -> [ secname, ...]
178
228
 
179
-		while (<$fh>) {
180
-			chomp;
181
-			push(@output, $_);
182
-		}
229
+	# sort results to retain link order and split to sections per
230
+	# initcall level
231
+	foreach my $index (sort { $a <=> $b } keys(%{$results})) {
232
+		foreach my $result (@{$results->{$index}}) {
233
+			my $level = $result->{'level'};
183
234
 
184
-		close($fh);
235
+			if (!exists($sections->{$level})) {
236
+				$sections->{$level} = [];
237
+			}
185
238
 
186
-		# if $ar failed, assume we have an object file
187
-		if ($? != 0) {
188
-			push(@objects, $file);
189
-			next;
190
-		}
191
-
192
-		# if $ar succeeded, read the list of object files
193
-		foreach (@output) {
194
-			push(@objects, $_);
239
+			push(@{$sections->{$level}}, $result->{'secname'});
195
240
 		}
196
241
 	}
197
-}
198
242
 
199
-## START
200
-find_objects();
201
-process_objects();
243
+	die "$0: ERROR: no initcalls?" if (!keys(%{$sections}));
202
244
 
203
-## process results and add them to $sections in the correct order
204
-my $sections = {};
245
+	# print out a linker script that defines the order of initcalls for
246
+	# each level
247
+	print "SECTIONS {\n";
205
248
 
206
-foreach my $index (sort { $a <=> $b } keys(%{$results})) {
207
-	foreach my $result (@{$results->{$index}}) {
208
-		my $level = $result->{'level'};
249
+	foreach my $level (sort(keys(%{$sections}))) {
250
+		my $section;
209
251
 
210
-		if (!exists($sections->{$level})) {
211
-			$sections->{$level} = [];
252
+		if ($level eq 'con') {
253
+			$section = '.con_initcall.init';
254
+		} else {
255
+			$section = ".initcall${level}.init";
212
256
 		}
213
257
 
214
-		my $fsname = $result->{'counter'} . '_' .
215
-			     $result->{'line'}    . '_' .
216
-			     $result->{'function'};
258
+		print "\t${section} : {\n";
217
259
 
218
-		push(@{$sections->{$level}}, $fsname);
219
-	}
220
-}
260
+		foreach my $secname (@{$sections->{$level}}) {
261
+			print "\t\t*(${section}..${secname}) ;\n";
262
+		}
221
263
 
222
-if (!keys(%{$sections})) {
223
-	exit(0); # no initcalls...?
224
-}
225
-
226
-## print out a linker script that defines the order of initcalls for each
227
-## level
228
-print "SECTIONS {\n";
229
-
230
-foreach my $level (sort(keys(%{$sections}))) {
231
-	my $section;
232
-
233
-	if ($level eq 'con') {
234
-		$section = '.con_initcall.init';
235
-	} elsif ($level eq 'security') {
236
-		$section = '.security_initcall.init';
237
-	} else {
238
-		$section = ".initcall${level}.init";
264
+		print "\t}\n";
239
265
 	}
240
266
 
241
-	print "\t${section} : {\n";
242
-
243
-	foreach my $fsname (@{$sections->{$level}}) {
244
-		print "\t\t*(${section}..${fsname}) ;\n"
245
-	}
246
-
247
-	print "\t}\n";
267
+	print "}\n";
248
268
 }
249
269
 
250
-print "}\n";
270
+generate_initcall_lds();