Fix two more memory leaks. (CVS 1603)

FossilOrigin-Name: 98b48704a1ce983677cdb269c24f7bca4ed606f7

tool/memleak3.tcl

@@ -0,0 +1,106 @@
+#/bin/sh
+# \
+exec `which tclsh` $0 "$@"
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+######################################################################
+
+set doco "
+This script is a tool to help track down memory leaks in the sqlite
+library. The library must be compiled with the preprocessor symbol
+SQLITE_DEBUG set to at least 2. It must be set to 3 to enable stack traces.
+
+To use, run the leaky application and save the standard error output.
+Then, execute this program with the first argument the name of the
+application binary (or interpreter) and the second argument the name of the
+text file that contains the collected stderr output.
+
+If all goes well a summary of unfreed allocations is printed out. If the
+GNU C library is in use and SQLITE_DEBUG is 3 or greater a stack trace is
+printed out for each unmatched allocation.
+
+Example:
+
+$ ./testfixture ../sqlite/test/select1.test 2> memtrace.out
+$ tclsh $argv0 ./testfixture memtrace.out
+"
+
+# If stack traces are enabled, the 'addr2line' program is called to
+# translate a binary stack address into a human-readable form.
+set addr2line addr2line
+
+if { [llength $argv]!=2 } {
+  puts "Usage: $argv0 <binary file> <mem trace file>"
+  puts ""
+  puts [string trim $doco]
+  exit -1
+}
+
+
+proc process_input {input_file array_name} {
+  upvar $array_name mem 
+  set input [open $input_file]
+
+  set MALLOC {([[:digit:]]+) malloc ([[:digit:]]+) bytes at 0x([[:xdigit:]]+)}
+  set STACK {^STACK: (.*)$}
+  set FREE {[[:digit:]]+ free ([[:digit:]]+) bytes at 0x([[:xdigit:]]+)}
+  set REALLOC {([[:digit:]]+) realloc ([[:digit:]]+) to ([[:digit:]]+)}
+  append REALLOC { bytes at 0x([[:xdigit:]]+) to 0x([[:xdigit:]]+)}
+
+  set stack ""
+  while { ![eof $input] } {
+    set line [gets $input]
+    if {[regexp $STACK $line dummy stack]} {
+      # Do nothing. The variable $stack now stores the hexadecimal stack dump
+      # for the next malloc() or realloc().
+
+    } elseif { [regexp $MALLOC $line dummy mallocid bytes addr]  } {
+      # If this is a 'malloc' line, set an entry in the mem array. Each entry
+      # is a list of length three, the number of bytes allocated , the malloc
+      # number and the stack dump when it was allocated.
+      set mem($addr) [list $bytes "malloc $mallocid" $stack]
+      set stack ""
+
+    } elseif { [regexp $FREE $line dummy bytes addr] } {
+      # If this is a 'free' line, remove the entry from the mem array. If the 
+      # entry does not exist, or is the wrong number of bytes, announce a
+      # problem. This is more likely a bug in the regular expressions for
+      # this script than an SQLite defect.
+      if { [lindex $mem($addr) 0] != $bytes } {
+        error "byte count mismatch"
+      }
+      unset mem($addr) 
+
+    } elseif { [regexp $REALLOC $line dummy mallocid ob b oa a] } {
+      # If it is a realloc line, remove the old mem entry and add a new one.
+      unset mem($oa);
+      set mem($a) [list $b "realloc $mallocid" $stack]
+      set stack ""
+    } else {
+      # puts "REJECT: $line"
+    }
+  }
+
+  close $input
+}
+
+process_input [lindex $argv 1] mem
+set exe [lindex $argv 0]
+
+foreach key [array names mem] {
+  set bytes [lindex $mem($key) 0]
+  set mallocid [lindex $mem($key) 1]
+  set stack [lindex $mem($key) 2]
+  puts "Leaked $bytes bytes at 0x$key: $mallocid"
+  foreach frame [lrange $stack 1 10] {
+    foreach {f l} [split [exec $addr2line -f --exe=$exe $frame] \n] {}
+    puts [format "%-30s %s" $f $l]
+  }
+  if {[llength $stack]>0 } {puts ""}
+}
+