sloc_purge

来自「A MP3 Player Source Code, Enjoy it!」· 代码 · 共 54 行

#! /usr/bin/perl

# remove the DSEG memory allocation for "sloc" variables
# created by SDCC that were completely removed by the
# custom peephole definitions in peephole.def.


# first, read in all the asm code
while (<>) {
	chop;
	$line[$lineno++] = $_;
}

for ($i=0; $i<$lineno; $i++) {
	next unless $line[$i] =~ /^(_[A-Za-z0-9_]+sloc[0-9]+_[0-9]+_[0-9]+)::/;
	$sloc = $1;
	next unless $i < $lineno - 1;
	next unless $line[$i+1] =~ /^[ \t]*\.ds[ \t]+([0-9]+)$/;
	$sloc_alloc = $1;
	#print "; $sloc\n";
	$sloc_removable = 1;
	$sloc_size = 1;
	for ($j=$i+1; $j<$lineno; $j++) {
		$_ = $line[$j];
		$_ = $` if /;/;
		if (/$sloc/) {
			$sloc_removable = 0;
			if (/\(${sloc} \+ ([0-9]+)\)/) {
				$size = $1 + 1;
				$sloc_size = $size if $size > $sloc_size;
			}
			#print "; $_\n";
		}
	}
	
	if ($sloc_removable) {
		#print "; purging $sloc\n";
		$line[$i] = ';(sloc optimized away) ' . $line[$i];
		$line[$i+1] = ';(sloc optimized away) ' . $line[$i+1];
	} else {
		if ($sloc_size < $sloc_alloc) {
			$line[$i+1] = "\t.ds\t$sloc_size\t";
			$line[$i+1] .= "; allocation changed to $sloc_size";
			$line[$i+1] .= " (was $sloc_alloc)";
		}
	}
}

for ($i=0; $i<$lineno; $i++) {
	print $line[$i], "\n";
}