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39 * Date: 09 November 2002
40 * SUMMARY: Test that interpreter can handle string literals exceeding 64K
41 * See http://bugzilla.mozilla.org/show_bug.cgi?id=179068
43 * Test that the interpreter can handle string literals exceeding 64K limit.
44 * For that the script passes to eval() "str ='LONG_STRING_LITERAL';" where
45 * LONG_STRING_LITERAL is a string with 200K chars.
47 * Igor Bukanov explains the technique used below:
49 * > Philip Schwartau wrote:
51 * > Here is the heart of the testcase:
53 * > // Generate 200K long string
54 * > var long_str = duplicate(LONG_STR_SEED, N);
56 * > eval("str='".concat(long_str, "';"));
57 * > var test_is_ok = (str.length == LONG_STR_SEED.length * N);
60 * > The testcase creates two identical strings, |long_str| and |str|. It
61 * > uses eval() simply to assign the value of |long_str| to |str|. Why is
62 * > it necessary to have the variable |str|, then? Why not just create
63 * > |long_str| and test it? Wouldn't this be enough:
65 * > // Generate 200K long string
66 * > var long_str = duplicate(LONG_STR_SEED, N);
67 * > var test_is_ok = (long_str.length == LONG_STR_SEED.length * N);
69 * > Or do we specifically need to test eval() to exercise the interpreter?
71 * The reason for eval is to test string literals like in 'a string literal
72 * with 100 000 characters...', Rhino deals fine with strings generated at
73 * run time where lengths > 64K. Without eval it would be necessary to have
74 * a test file excedding 64K which is not that polite for CVS and then a
75 * special treatment for the compiled mode in Rhino should be added.
79 * > If so, is it important to use the concat() method in the assignment, as
80 * > you have done: |eval("str='".concat(long_str, "';"))|, or can we simply
81 * > do |eval("str = long_str;")| ?
83 * The concat is a replacement for eval("str='"+long_str+"';"), but as
84 * long_str is huge, this leads to constructing first a new string via
85 * "str='"+long_str and then another one via ("str='"+long_str) + "';"
86 * which takes time under JDK 1.1 on a something like StrongArm 200MHz.
87 * Calling concat makes less copies, that is why it is used in the
88 * duplicate function and this is faster then doing recursion like in the
89 * test case to test that 64K different string literals can be handled.
92 //-----------------------------------------------------------------------------
95 var summary = 'Test that interpreter can handle string literals exceeding 64K';
99 var actualvalues = [];
101 var expectedvalues = [];
102 var LONG_STR_SEED = "0123456789";
107 // Generate 200K long string and assign it to |str| via eval()
108 var long_str = duplicate(LONG_STR_SEED, N);
109 eval("str='".concat(long_str, "';"));
111 status = inSection(1);
112 actual = str.length == LONG_STR_SEED.length * N
118 //-----------------------------------------------------------------------------
120 //-----------------------------------------------------------------------------
124 function duplicate(str, count)
126 var tmp = new Array(count);
131 return String.prototype.concat.apply("", tmp);
137 statusitems[UBound] = status;
138 actualvalues[UBound] = actual;
139 expectedvalues[UBound] = expect;
148 printStatus(summary);
150 for (var i=0; i<UBound; i++)
152 reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);