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# 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 1.19 2006/03/21 11:12:29 dkf 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 minStack2400 1
if {[testConstraint unix]} {
    set stackSize [exec /bin/sh -c "ulimit -s"]
    if {[string is integer $stackSize] && ($stackSize < 2400)} {
        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 2400\
                kbytes is recommended.\nSkipping infinite recursion test."
        testConstraint minStack2400 0
    }
}

test stack-1.1 {maxNestingDepth reached on infinite recursion} {minStack2400} {
    proc recurse {} { return [recurse] }
    catch {recurse} rv
    rename recurse {}
    set rv
} {too many nested evaluations (infinite loop?)}

test stack-2.1 {maxNestingDepth reached on infinite recursion} {minStack2400} {
    # do this in a slave to not mess with parent
    set slave stack-2.1
    interp create $slave
    $slave eval { interp alias {} unknown {} notaknownproc }
    set msg [$slave eval { catch {foo} msg ; set msg }]
    interp delete $slave
    set msg
} {too many nested evaluations (infinite loop?)}

# 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} -setup {
    set limit [interp recursionlimit {} 10000]
    set depth 0
    proc a { max } {
	if { [info level] < $max } {
	    set ::depth [info level]
	    a $max
	} else {
	    regexp {^ ?} x
	}
    }
} -body {
    catch { a 10001 }
    set depth2 $depth
    list [a $depth] [expr { $depth2 - $depth }]
} -cleanup {
    interp recursionlimit {} $limit
    rename a {}
} -result {1 1}

# cleanup
::tcltest::cleanupTests
return

# Local Variables:
# mode: tcl
# End: