107 lines
3.6 KiB
Tcl
107 lines
3.6 KiB
Tcl
#/bin/sh
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# \
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exec `which tclsh` $0 "$@"
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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######################################################################
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set doco "
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This script is a tool to help track down memory leaks in the sqlite
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library. The library must be compiled with the preprocessor symbol
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SQLITE_DEBUG set to at least 2. It must be set to 3 to enable stack traces.
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To use, run the leaky application and save the standard error output.
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Then, execute this program with the first argument the name of the
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application binary (or interpreter) and the second argument the name of the
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text file that contains the collected stderr output.
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If all goes well a summary of unfreed allocations is printed out. If the
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GNU C library is in use and SQLITE_DEBUG is 3 or greater a stack trace is
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printed out for each unmatched allocation.
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Example:
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$ ./testfixture ../sqlite/test/select1.test 2> memtrace.out
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$ tclsh $argv0 ./testfixture memtrace.out
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"
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# If stack traces are enabled, the 'addr2line' program is called to
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# translate a binary stack address into a human-readable form.
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set addr2line addr2line
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if { [llength $argv]!=2 } {
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puts "Usage: $argv0 <binary file> <mem trace file>"
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puts ""
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puts [string trim $doco]
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exit -1
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}
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proc process_input {input_file array_name} {
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upvar $array_name mem
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set input [open $input_file]
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set MALLOC {([[:digit:]]+) malloc ([[:digit:]]+) bytes at 0x([[:xdigit:]]+)}
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set STACK {^STACK: (.*)$}
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set FREE {[[:digit:]]+ free ([[:digit:]]+) bytes at 0x([[:xdigit:]]+)}
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set REALLOC {([[:digit:]]+) realloc ([[:digit:]]+) to ([[:digit:]]+)}
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append REALLOC { bytes at 0x([[:xdigit:]]+) to 0x([[:xdigit:]]+)}
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set stack ""
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while { ![eof $input] } {
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set line [gets $input]
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if {[regexp $STACK $line dummy stack]} {
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# Do nothing. The variable $stack now stores the hexadecimal stack dump
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# for the next malloc() or realloc().
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} elseif { [regexp $MALLOC $line dummy mallocid bytes addr] } {
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# If this is a 'malloc' line, set an entry in the mem array. Each entry
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# is a list of length three, the number of bytes allocated , the malloc
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# number and the stack dump when it was allocated.
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set mem($addr) [list $bytes "malloc $mallocid" $stack]
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set stack ""
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} elseif { [regexp $FREE $line dummy bytes addr] } {
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# If this is a 'free' line, remove the entry from the mem array. If the
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# entry does not exist, or is the wrong number of bytes, announce a
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# problem. This is more likely a bug in the regular expressions for
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# this script than an SQLite defect.
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if { [lindex $mem($addr) 0] != $bytes } {
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error "byte count mismatch"
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}
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unset mem($addr)
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} elseif { [regexp $REALLOC $line dummy mallocid ob b oa a] } {
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# If it is a realloc line, remove the old mem entry and add a new one.
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unset mem($oa);
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set mem($a) [list $b "realloc $mallocid" $stack]
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set stack ""
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} else {
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# puts "REJECT: $line"
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}
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}
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close $input
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}
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process_input [lindex $argv 1] mem
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set exe [lindex $argv 0]
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foreach key [array names mem] {
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set bytes [lindex $mem($key) 0]
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set mallocid [lindex $mem($key) 1]
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set stack [lindex $mem($key) 2]
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puts "Leaked $bytes bytes at 0x$key: $mallocid"
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foreach frame [lrange $stack 1 10] {
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foreach {f l} [split [exec $addr2line -f --exe=$exe $frame] \n] {}
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puts [format "%-30s %s" $f $l]
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}
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if {[llength $stack]>0 } {puts ""}
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}
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