| // Check JS::ubi::Node::size results for symbols. |
| |
| // We actually hard-code specific sizes into this test, even though they're |
| // implementation details, because in practice there are only two architecture |
| // variants to consider (32-bit and 64-bit), and if these sizes change, that's |
| // something SpiderMonkey hackers really want to know; they're supposed to be |
| // stable. |
| |
| // Run this test only if we're using jemalloc. Other malloc implementations |
| // exhibit surprising behaviors. For example, 32-bit Fedora builds have |
| // non-deterministic allocation sizes. |
| var config = getBuildConfiguration(); |
| if (!config['moz-memory']) |
| quit(0); |
| |
| const SIZE_OF_SYMBOL = config['pointer-byte-size'] == 4 ? 16 : 24; |
| |
| // Without a description. |
| assertEq(byteSize(Symbol()), SIZE_OF_SYMBOL); |
| |
| // With a description. |
| assertEq(byteSize(Symbol("This is a relatively long description to be passed to " |
| + "Symbol() but it doesn't matter because it just gets " |
| + "interned as a JSAtom* anyways.")), |
| SIZE_OF_SYMBOL); |
