# Tests that the stack size is big enough for the application. # # This file contains a collection of tests for one or more of the Tcl # built-in commands. Sourcing this file into Tcl runs the tests and # generates output for errors. No output means no errors were found. # # Copyright (c) 1998-2000 Ajuba Solutions. # # See the file "license.terms" for information on usage and redistribution # of this file, and for a DISCLAIMER OF ALL WARRANTIES. # # RCS: @(#) $Id: stack.test,v 1.22.2.1 2010/01/06 21:35:25 nijtmans Exp $ if {[lsearch [namespace children] ::tcltest] == -1} { package require tcltest 2 namespace import -force ::tcltest::* } # Note that a failure in this test results in a crash of the executable. # In order to avoid that, we do a basic check of the current stacksize. # This size can be changed with ulimit (ksh/bash/sh) or limit (csh/tcsh). # This doesn't catch all cases, for example threads of lower stacksize # can still squeak through. A core check is really needed. -- JH testConstraint minStack2034 1 if {[testConstraint unix]} { set stackSize [exec /bin/sh -c "ulimit -s"] if {[string is integer $stackSize] && ($stackSize < 2034)} { puts stderr "WARNING: the default application stacksize of $stackSize\ may cause Tcl to\ncrash due to stack overflow before the\ recursion limit is reached.\nA minimum stacksize of 2034\ kbytes is recommended.\nSkipping infinite recursion test." testConstraint minStack2034 0 } } # # Custom match to detect a stack overflow independently of the mechanism that # triggered the error. # customMatch stackOverflow StackOverflow proc StackOverflow {- res} { set msgList [list \ "too many nested evaluations (infinite loop?)"\ "out of stack space (infinite loop?)"] expr {$res in $msgList} } test stack-1.1 {maxNestingDepth reached on infinite recursion} -constraints { minStack2034 } -body { # do this in a sub process in case it segfaults exec [interpreter] << { proc recurse {} { recurse } catch { recurse } rv puts $rv } } -match stackOverflow test stack-2.1 {maxNestingDepth reached on infinite recursion} -constraints { minStack2034 } -body { # do this in a sub process in case it segfaults exec [interpreter] << { interp alias {} unknown {} notaknownproc catch { unknown } msg puts $msg } } -match stackOverflow # Make sure that there is enough stack to run regexp even if we're # close to the recursion limit. [Bug 947070] [Patch 746378] test stack-3.1 {enough room for regexp near recursion limit} -body { # do this in a sub process in case it segfaults exec [interpreter] << { interp recursionlimit {} 10000 set depth 0 proc a { max } { if { [info level] < $max } { set ::depth [info level] a $max } else { regexp {^ ?} x } } catch { a 10001 } set depth2 $depth puts [list [a $depth] [expr { $depth2 - $depth }]] } } -result {1 1} # cleanup ::tcltest::cleanupTests return # Local Variables: # mode: tcl # End: