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(module
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  ;;声明需要提供内存
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  (import "env" "memory" (memory 1 2)) ;; 初始 1 页，最大 2 页
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  ;; 写入 i32 到内存[offset]
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  (func (export "writeToMemory") (param i32) (param i32)
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    (i32.store
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      (local.get 0)
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      (local.get 1)
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    )
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  )
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  ;; 从内存[offset] 读取 i32
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  (func (export "readFromMemory") (param i32) (result i32)
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    (i32.load
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      (local.get 0)
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    )
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  )
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)

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const fs = require('fs');
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(async () => {
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  const memory = new WebAssembly.Memory({ initial: 1, maximum: 2 });
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  const importObject = {
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    env: {
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      memory: memory
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    }
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  };
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  // 读取wasm，分配内存
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  const wasmBuffer = fs.readFileSync('./memory_test.wasm');
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  const wasmModule = await WebAssembly.instantiate(wasmBuffer, importObject);
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  const { writeToMemory, readFromMemory} = wasmModule.instance.exports;
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  const inBoundsOffset = 65532; // 正常偏移
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  const outOfBoundsOffset = 70000; // 越界偏移
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  // 测试正常写入和读取
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  writeToMemory(inBoundsOffset, 123456);
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  console.log("读取数据:", readFromMemory(inBoundsOffset));
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  try {
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    // 👇 试图越界写入
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    console.log("尝试越界写数据");
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    writeToMemory(outOfBoundsOffset, 999);
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  } catch (err) {
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    console.error("越界写错误:", err.message);
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    console.log(err);
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  }
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  try {
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    // 👇 试图越界读取
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    console.log("尝试越界读数据");
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    console.log(readFromMemory(outOfBoundsOffset));
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  } catch (err) {
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    console.error("越界读错误:", err.message);
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    console.log(err);
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  }
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})();