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Add testcase for out-of-memory unwind (GH-476)
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svaarala committed Dec 4, 2015
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/*
* https:/svaarala/duktape/issues/476
*
* When running out of memory, a protected call will catch the error and will
* then proceed to unwind the callstack. The callstack unwind process needs
* to copy variable values from value stack to a scope object (for some
* activations). Because the scope object is not preallocated, this process
* requires a memory allocation which may fail. As a result, a protected call
* first correctly catches an out-of-memory error but throws a new error when
* doing the unwind which then makes the protected call unsafe and may cause
* a fatal error.
*
* This testcase demonstrates the issue. You need a command line 'duk'
* executable which has a limited memory pool, e.g. the 'ajduk' example.
* Expect string is for the desktop version with no memory limitations,
* this testcase is intended to be run manually.
*/

/*===
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finished
===*/

function recursive(n) {
/* Large register frame and an inner function ensures that when the
* activation unwinds the lexical scope is copied a lot of variables
* which requires the scope object's property table to grow (if not
* pregrown).
*/
var x00 = 100, x01 = 101, x02 = 102, x03 = 103, x04 = 104, x05 = 105, x06 = 106, x07 = 107, x08 = 108, x09 = 109;
var x11 = 110, x11 = 111, x12 = 112, x13 = 113, x14 = 114, x15 = 115, x16 = 116, x17 = 117, x18 = 118, x19 = 119;
var x20 = 120, x21 = 121, x22 = 122, x23 = 123, x24 = 124, x25 = 125, x26 = 126, x27 = 127, x28 = 128, x29 = 129;
var x30 = 130, x31 = 131, x32 = 132, x33 = 133, x34 = 134, x35 = 135, x36 = 136, x37 = 137, x38 = 138, x39 = 139;
var x40 = 140, x41 = 141, x42 = 142, x43 = 143, x44 = 144, x45 = 145, x46 = 146, x47 = 147, x48 = 148, x49 = 149;
var x50 = 150, x51 = 151, x52 = 152, x53 = 153, x54 = 154, x55 = 155, x56 = 156, x57 = 157, x58 = 158, x59 = 159;
var x60 = 160, x61 = 161, x62 = 162, x63 = 163, x64 = 164, x65 = 165, x66 = 166, x67 = 167, x68 = 168, x69 = 169;
var x70 = 170, x71 = 171, x72 = 172, x73 = 173, x74 = 174, x75 = 175, x76 = 176, x77 = 177, x78 = 178, x79 = 179;
var x80 = 180, x81 = 181, x82 = 182, x83 = 183, x84 = 184, x85 = 185, x86 = 186, x87 = 187, x88 = 188, x89 = 189;
var x90 = 190, x91 = 191, x92 = 192, x93 = 193, x94 = 194, x95 = 195, x96 = 196, x97 = 197, x98 = 198, x99 = 199;

print('outer', n);

// Inner function currently causes Duktape to save the outer scope.
// Reference all the variables so that they will be kept in unwound
// even if the scope copying is optimized (not in Duktape 1.4.0 yet
// but planned).
function inner() {
print('inner', n);
print(x00 + x01 + x02 + x03 + x04 + x05 + x06 + x07 + x08 + x09,
x11 + x11 + x12 + x13 + x14 + x15 + x16 + x17 + x18 + x19,
x20 + x21 + x22 + x23 + x24 + x25 + x26 + x27 + x28 + x29,
x30 + x31 + x32 + x33 + x34 + x35 + x36 + x37 + x38 + x39,
x40 + x41 + x42 + x43 + x44 + x45 + x46 + x47 + x48 + x49,
x50 + x51 + x52 + x53 + x54 + x55 + x56 + x57 + x58 + x59,
x60 + x61 + x62 + x63 + x64 + x65 + x66 + x67 + x68 + x69,
x70 + x71 + x72 + x73 + x74 + x75 + x76 + x77 + x78 + x79,
x80 + x81 + x82 + x83 + x84 + x85 + x86 + x87 + x88 + x89,
x90 + x91 + x92 + x93 + x94 + x95 + x96 + x97 + x98 + x99);
}
inner();

// Recurse until out-of-memory (or out of patience).
if (n > 0) {
recursive(n - 1);
} else {
;
}
}

function test() {
recursive(100);
}

// No try-catch to avoid memory allocations.
test()
print('finished');

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