1// Flags: --expose-gc
2'use strict';
3
4const common = require('../../common');
5const skipMessage = 'intensive toString tests due to memory confinements';
6if (!common.enoughTestMem)
7  common.skip(skipMessage);
8
9const binding = require(`./build/${common.buildType}/binding`);
10const assert = require('assert');
11
12// v8 fails silently if string length > v8::String::kMaxLength
13// v8::String::kMaxLength defined in v8.h
14const kStringMaxLength = require('buffer').constants.MAX_STRING_LENGTH;
15
16let buf;
17try {
18  buf = Buffer.allocUnsafe(kStringMaxLength + 1);
19} catch (e) {
20  // If the exception is not due to memory confinement then rethrow it.
21  if (e.message !== 'Array buffer allocation failed') throw (e);
22  common.skip(skipMessage);
23}
24
25// Ensure we have enough memory available for future allocations to succeed.
26if (!binding.ensureAllocation(2 * kStringMaxLength))
27  common.skip(skipMessage);
28
29const stringLengthHex = kStringMaxLength.toString(16);
30assert.throws(() => {
31  buf.toString('latin1');
32}, {
33  message: `Cannot create a string longer than 0x${stringLengthHex} ` +
34           'characters',
35  code: 'ERR_STRING_TOO_LONG',
36  name: 'Error',
37});
38
39// FIXME: Free the memory early to avoid OOM.
40// REF: https://github.com/nodejs/reliability/issues/12#issuecomment-412619655
41global.gc();
42let maxString = buf.toString('latin1', 1);
43assert.strictEqual(maxString.length, kStringMaxLength);
44maxString = undefined;
45global.gc();
46
47maxString = buf.toString('latin1', 0, kStringMaxLength);
48assert.strictEqual(maxString.length, kStringMaxLength);
49