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#!/usr/bin/perl
#
# Reads a log file, containing lines of the four types
# <file> <line> malloc(<number>) returns <pointer>
# <file> <line> strdup(<number>) returns <pointer>
# <file> <line> calloc(<number>*<number>) returns <pointer>
# <file> <line> realloc(<pointer>,<number>) returns <pointer>
# <file> <line> free(<pointer>)
#
# with optional line on the front saying
# null pointer is <pointer>
#
# and produces a list of free()s and realloc()s of wrong pointers,
# and also of malloc()s, calloc()s and realloc()s that never get free()d.
$errors=0;
while (<<>>) {
$in=$out="";
($file, $line, $call, $in, $out)=($1,$2,$3,"",$4)
if /^(\S+) (\S+) (malloc|strdup)\(\S+\) returns (\S+)$/;
($file, $line, $call, $in, $out)=($1,$2,"calloc","",$5)
if /^(\S+) (\S+) calloc\(\S+\*\S+\) returns (\S+)$/;
($file, $line, $call, $in, $out)=($1,$2,"realloc",$3,$4)
if /^(\S+) (\S+) realloc\((\S+),\S+\) returns (\S+)$/;
($file, $line, $call, $in, $out)=($1,$2,"free",$3,"")
if /^(\S+) (\S+) free\((\S+)\)$/;
$null = $1, next if /^null pointer is (\S+)$/;
if ($in ne "") {
if (&null($in)) {
$bad = "null pointer";
} elsif (defined $lastalloc{$in}) {
$bad = "already-freed pointer (last alloc $lastalloc{$in}, last free $lastfree{$in})";
} else {
$bad = "bad pointer";
}
$errors=1, print "($.) $file:$line: $call() $bad\n"
if $record{$in} eq "";
$lastfree{$in}="($.) $file:$line";
$record{$in}="";
}
if ($out ne "" && !&null($out)) {
$errors=1, print "($.) $file:$line: $call() returned already ".
"allocated pointer\n" if $record{$out} ne "";
$record{$out}="($.) $file:$line: $call()";
$lastalloc{$out}="($.) $file:$line";
}
}
foreach $i (keys %record) {
$errors=1, print "$record{$i} never got freed\n"
if $record{$i} ne "";
}
print "no problems\n" if !$errors;
# determine if a string refers to a null pointer
sub null {
local ($_) = @_;
$null ? $_ eq $null : /^((0x)?0+|\(nil\))$/;
}
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