michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:  *
michael@0:  * Date:    09 November 2002
michael@0:  * SUMMARY: Test that interpreter can handle string literals exceeding 64K
michael@0:  * See http://bugzilla.mozilla.org/show_bug.cgi?id=179068
michael@0:  *
michael@0:  * Test that the interpreter can handle string literals exceeding 64K limit.
michael@0:  * For that the script passes to eval() "str ='LONG_STRING_LITERAL';" where
michael@0:  * LONG_STRING_LITERAL is a string with 200K chars.
michael@0:  *
michael@0:  *   Igor Bukanov explains the technique used below:
michael@0:  *
michael@0:  * > Philip Schwartau wrote:
michael@0:  * >...
michael@0:  * > Here is the heart of the testcase:
michael@0:  * >
michael@0:  * >   // Generate 200K long string
michael@0:  * >   var long_str = duplicate(LONG_STR_SEED, N);
michael@0:  * >   var str = "";
michael@0:  * >   eval("str='".concat(long_str, "';"));
michael@0:  * >   var test_is_ok = (str.length == LONG_STR_SEED.length * N);
michael@0:  * >
michael@0:  * >
michael@0:  * > The testcase creates two identical strings, |long_str| and |str|. It
michael@0:  * > uses eval() simply to assign the value of |long_str| to |str|. Why is
michael@0:  * > it necessary to have the variable |str|, then? Why not just create
michael@0:  * > |long_str| and test it? Wouldn't this be enough:
michael@0:  * >
michael@0:  * >   // Generate 200K long string
michael@0:  * >   var long_str = duplicate(LONG_STR_SEED, N);
michael@0:  * >   var test_is_ok = (long_str.length == LONG_STR_SEED.length * N);
michael@0:  * >
michael@0:  * > Or do we specifically need to test eval() to exercise the interpreter?
michael@0:  *
michael@0:  * The reason for eval is to test string literals like in 'a string literal
michael@0:  * with 100 000 characters...', Rhino deals fine with strings generated at
michael@0:  * run time where lengths > 64K. Without eval it would be necessary to have
michael@0:  * a test file excedding 64K which is not that polite for CVS and then a
michael@0:  * special treatment for the compiled mode in Rhino should be added.
michael@0:  *
michael@0:  *
michael@0:  * >
michael@0:  * > If so, is it important to use the concat() method in the assignment, as
michael@0:  * > you have done: |eval("str='".concat(long_str, "';"))|, or can we simply
michael@0:  * > do |eval("str = long_str;")| ?
michael@0:  *
michael@0:  * The concat is a replacement for eval("str='"+long_str+"';"), but as
michael@0:  * long_str is huge, this leads to constructing first a new string via
michael@0:  * "str='"+long_str and then another one via ("str='"+long_str) + "';"
michael@0:  * which takes time under JDK 1.1 on a something like StrongArm 200MHz.
michael@0:  * Calling concat makes less copies, that is why it is used in the
michael@0:  * duplicate function and this is faster then doing recursion like in the
michael@0:  * test case to test that 64K different string literals can be handled.
michael@0:  *
michael@0:  */
michael@0: //-----------------------------------------------------------------------------
michael@0: var UBound = 0;
michael@0: var BUGNUMBER = 179068;
michael@0: var summary = 'Test that interpreter can handle string literals exceeding 64K';
michael@0: var status = '';
michael@0: var statusitems = [];
michael@0: var actual = '';
michael@0: var actualvalues = [];
michael@0: var expect= '';
michael@0: var expectedvalues = [];
michael@0: var LONG_STR_SEED = "0123456789";
michael@0: var N = 20 * 1024;
michael@0: var str = "";
michael@0: 
michael@0: 
michael@0: // Generate 200K long string and assign it to |str| via eval()
michael@0: var long_str = duplicate(LONG_STR_SEED, N);
michael@0: eval("str='".concat(long_str, "';"));
michael@0: 
michael@0: status = inSection(1);
michael@0: actual = str.length == LONG_STR_SEED.length * N
michael@0:   expect = true;
michael@0: addThis();
michael@0: 
michael@0: 
michael@0: 
michael@0: //-----------------------------------------------------------------------------
michael@0: test();
michael@0: //-----------------------------------------------------------------------------
michael@0: 
michael@0: 
michael@0: 
michael@0: function duplicate(str, count)
michael@0: {
michael@0:   var tmp = new Array(count);
michael@0: 
michael@0:   while (count != 0)
michael@0:     tmp[--count] = str;
michael@0: 
michael@0:   return String.prototype.concat.apply("", tmp);
michael@0: }
michael@0: 
michael@0: 
michael@0: function addThis()
michael@0: {
michael@0:   statusitems[UBound] = status;
michael@0:   actualvalues[UBound] = actual;
michael@0:   expectedvalues[UBound] = expect;
michael@0:   UBound++;
michael@0: }
michael@0: 
michael@0: 
michael@0: function test()
michael@0: {
michael@0:   enterFunc('test');
michael@0:   printBugNumber(BUGNUMBER);
michael@0:   printStatus(summary);
michael@0: 
michael@0:   for (var i=0; i<UBound; i++)
michael@0:   {
michael@0:     reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
michael@0:   }
michael@0: 
michael@0:   exitFunc ('test');
michael@0: }