Code runs in a strict sandbox where the only allowed operations are calling functions provided by the host. If the host doesn’t provide a file reading function, the WASM module simply cannot read files. The failure mode here requires a vulnerability in the WASM runtime itself, like an out-of-bounds memory read that bypasses the linear memory checks.
use a PAGESZ that is the LCM of the operating system page size and
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// 1. 统计当前位每个数字出现次数