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#!/usr/bin/perl -w
################################################################################
#
# PROGRAM: check_alloc.pl
#
################################################################################
#
# DESCRIPTION: Check for memory leaks and print memory usage statistics
#
################################################################################
#
# Copyright (c) 2002-2024 Marcus Holland-Moritz. All rights reserved.
# This program is free software; you can redistribute it and/or modify
# it under the same terms as Perl itself.
#
################################################################################
use strict;
my(%alloc, %free);
my %info = (
allocs => 0,
frees => 0,
max_blocks => 0,
max_total => 0,
);
my $count = 0;
my $total = 0;
LOOP: while( <> ) {
next unless /^(.*?):(A|F|V|B)=(?:(\d+)\@)?([0-9a-fA-F]{8,})$/;
if( $2 eq 'A' ) {
if( exists $alloc{$4} ) {
print "Previously allocated in $alloc{$4}[0]: 0x$4 in $1\n";
next;
}
my $addr = hex $4;
$alloc{$4} = [$1,$3,$addr,$addr+$3-1];
$count++;
$total += $3;
$info{allocs}++;
$info{min_size} = $info{max_size} = $3 unless exists $info{min_size};
$info{min_size} = $3 if $3 < $info{min_size};
$info{max_size} = $3 if $3 > $info{max_size};
}
elsif( $2 eq 'F' ) {
unless( exists $alloc{$4} ) {
if( $4 eq '00000000' ) {
print "Freeing NULL pointer in $1\n" if $4 eq '00000000';
}
elsif( exists $free{$4} ) {
print "Freeing block more than once: 0x$4 in $1\n";
}
else {
print "Freeing block not previously allocated: 0x$4 in $1\n";
}
next;
}
$count--;
$total -= $alloc{$4}[1];
$info{frees}++;
$free{$4} = delete $alloc{$4};
}
elsif( $2 eq 'V' ) {
unless( exists $alloc{$4} ) {
if( $4 eq '00000000' ) {
print "Trying to validate NULL pointer in $1\n"
}
else {
print "Valid pointer assertion (0x$4) failed in $1\n";
if( exists $free{$4} ) {
print " - pointer references a block that has been freed\n";
}
else {
print " - pointer references memory not previously allocated\n";
}
}
}
next; # nothing needs to be updated
}
else { # $2 eq 'B'
if( $4 eq '00000000' ) {
print "Trying to validate block starting at NULL\n";
next;
}
my($min, $max);
my(@overlaps, @old_blocks, @old_overlaps);
$min = hex $4;
$max = $min + $3 - 1;
# print "[$4,$3] [min] => $min, [max] => $max\n";
# check allocated blocks
for my $key ( keys %alloc ) {
my $info = $alloc{$key};
# print "alloc: [2] => $info->[2], [3] => $info->[3]\n";
my $min_in = $info->[2] <= $min && $min <= $info->[3];
my $max_in = $info->[2] <= $max && $max <= $info->[3];
my $over = $min < $info->[2] && $max > $info->[3];
next unless $min_in || $max_in || $over;
next LOOP if $min_in && $max_in;
push @overlaps, $key;
}
# check freed blocks
for my $key ( keys %free ) {
my $info = $free{$key};
# print "free: [2] => $info->[2], [3] => $info->[3]\n";
my $min_in = $info->[2] <= $min && $min <= $info->[3];
my $max_in = $info->[2] <= $max && $max <= $info->[3];
my $over = $min < $info->[2] && $max > $info->[3];
next unless $min_in || $max_in || $over;
if( $min_in && $max_in ) {
push @old_blocks, $key;
last;
}
push @old_overlaps, $key;
}
print "Block assertion (0x$4, size $3) failed in $1\n";
if( @overlaps || @old_blocks || @old_overlaps ) {
print " - overlaps with allocated block at 0x$_, size $alloc{$_}[1]\n"
for @overlaps;
print " - references memory in old block at 0x$_, size $free{$_}[1]\n"
for @old_blocks;
print " - overlaps with old block at 0x$_, size $free{$_}[1]\n"
for @old_overlaps;
}
else {
print " - references memory not previously allocated\n";
}
next; # nothing needs to be updated
}
$info{max_blocks} = $count if $count > $info{max_blocks};
$info{max_total} = $total if $total > $info{max_total};
}
foreach( sort keys %alloc ) {
print "Not freed: block at 0x$_, size $alloc{$_}[1], allocated in $alloc{$_}[0]\n";
}
print <<ENDSTATS;
Summary Statistics:
Total allocs : $info{allocs}
Total frees : $info{frees}
Max. memory blocks : $info{max_blocks}
Max. memory usage : $info{max_total} bytes
Smallest block : $info{min_size} bytes
Largest block : $info{max_size} bytes
Memory leakage : $total bytes
ENDSTATS
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