{"id":2840,"date":"2022-08-28T03:00:46","date_gmt":"2022-08-27T19:00:46","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=2840"},"modified":"2022-08-28T03:00:47","modified_gmt":"2022-08-27T19:00:47","slug":"c%e6%8c%87%e9%92%88%ef%bc%8c%e5%b7%a6%e5%80%bc%e5%bc%95%e7%94%a8%ef%bc%8c%e5%8f%b3%e5%80%bc%e5%bc%95%e7%94%a8%e8%af%a6%e8%a7%a32","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=2840","title":{"rendered":"C++\u6307\u9488\uff0c\u5de6\u503c\u5f15\u7528\uff0c\u53f3\u503c\u5f15\u7528\u8be6\u89e32"},"content":{"rendered":"\n<p>C++ \u91cc\u9762\u6709\u4e00\u4e2a\u975e\u5e38\u72ec\u7279\u7684\u529f\u80fd\uff0c\u53eb <strong>\"\u53f3\u503c\u5f15\u7528\"<\/strong>\uff0c\u521a\u5b66 C++ \u7684\u4eba\u90fd\u4f1a\u89c9\u5f97\u8fd9\u4e2a\u4e1c\u897f\u975e\u5e38\u53cd\u4eba\u7c7b\uff0c\u6211\u4e5f\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n<p>\u6211\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u8981\u7406\u89e3 \u53f3\u503c\u5f15\u7528 \u8fd9\u73a9\u610f\uff0c\u9700\u8981\u5148\u5b66\u4e60\u6c47\u7f16\uff0c\u5982\u679c\u6ca1\u5b66 \u6c47\u7f16\uff0c\u76f4\u63a5\u5b66 C++ \u7684\u53f3\u503c\u5f15\u7528\u5c31\u4f1a\u89c9\u5f97\u5b83\u53cd\u4eba\u7c7b\uff0c\u4e0d\u6613\u7406\u89e3\u3002<\/p>\n\n\n\n<p>C++ \u91cc\u9762\u7684 \u5de6\u503c\uff0c\u53f3\u503c\uff0c\u5bf9\u5e94\u7684\u82f1\u6587\u7f29\u5199\u662f <code class=\"prettyprint\" >lvalue<\/code> \u8ddf <code>rvalue<\/code>\uff0c\u4f46\u662f\u76ee\u524d\uff0c\u5e02\u9762\u4e0a\uff0c\u8fd9\u4e24\u79cd\u6982\u5ff5\u6709\u4e0d\u540c\u7684\u7ffb\u8bd1\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\u6709\u4e9b\u4eba\u8bf4 <code class=\"prettyprint\" >lvalue<\/code> \u7684\u5168\u79f0\u662f <code>loactor value<\/code>\uff0c\u53ef\u5b9a\u4f4d\u7684\u503c\uff0c\u8fd9\u4e2a\u5b9e\u9645\u4e0a\u662f\u6307\u4f60\u5728 C\/C++ \u4ee3\u7801\u91cc\u9762\u80fd\u7528<strong>\u6807\u8bc6\u7b26<\/strong> \u5b9a\u4f4d\u5230\u7684\u503c\uff0c\u4f8b\u5982 <strong>int a = 1<\/strong>\uff0c\u8fd9\u91cc\u7684 a \u5c31\u662f\u4e00\u4e2a\u6807\u8bc6\u7b26\uff0c<code>a<\/code> \u5c31\u662f <code>loactor value<\/code>\u3002<\/p>\n\n\n\n<p>\u800c <code class=\"prettyprint\" >rvalue<\/code> \u7684\u5168\u79f0\u662f read value\uff0c\u53ea\u53ef\u8bfb\u53d6\u7684\u503c\u3002\u6211\u4e2a\u4eba\u89c9\u5f97\u8fd9\u4e2a\u7ffb\u8bd1\u89e3\u91ca\u4e5f\u4e0d\u592a\u5bf9\uff0c\u5e76\u4e0d\u662f\u53ea\u8bfb\u7684\u503c\uff0c\u800c\u662f <code>rvalue<\/code> \u662f\u6307\u4e00\u4e2a\u4e34\u65f6\u53d8\u91cf\uff0c\u6216\u8005\u8bf4\u662f\u533f\u540d\u53d8\u91cf\uff0c\u8fd9\u4e2a\u53d8\u91cf\u662f\u6ca1\u6709<strong>\u6807\u8bc6\u7b26<\/strong>\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u6240\u4ee5\u6211\u4e2a\u4eba\u503e\u5411\u4e8e\uff0c<code class=\"prettyprint\" >rvalue<\/code> \u7684\u6b63\u786e\u7ffb\u8bd1\u662f <strong>\u53f3\u503c<\/strong> \uff08\u4e34\u65f6\u53d8\u91cf\uff09\uff0c <code>lvalue<\/code> \u7684\u6b63\u786e\u7ffb\u8bd1\u662f <code>loactor value<\/code> \uff08\u53ef\u5b9a\u4f4d\u503c\uff09\uff0c\u800c\u4e0d\u5e94\u8be5\u7ffb\u8bd1\u6210\u5de6\u503c\u3002<\/p>\n\n\n\n<p><strong>\u5de6\u503c\u8ddf\u53f3\u503c\uff0c\u4e0d\u662f\u8bf4\u53d8\u91cf\u5728\u5de6\u8fb9\u4ed6\u5c31\u662f\u5de6\u503c\uff0c\u5728\u53f3\u8fb9\u4ed6\u5c31\u662f\u53f3\u503c\uff0c\u4e0d\u662f\u8fd9\u4e2a\u610f\u601d\uff0c\u4e0d\u8981\u88ab\u8fd9\u4e2a\u672f\u8bed\u8bef\u5bfc\u3002<\/strong>\u4f8b\u5982\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int&amp;&amp; b = 10;<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684 <code class=\"prettyprint\" >b<\/code> \u5c31\u662f\u5bf9\u53f3\u503c\u7684\u5f15\u7528\u3002\u4f46\u662f\u4ed6\u5728\u5de6\u8fb9\u3002<\/p>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u79cd\u4ee3\u7801\u5199\u6cd5\u662f\u6ca1\u6709\u610f\u4e49\u7684\uff0c\u8ddf\u76f4\u63a5 <code class=\"prettyprint\" >int b=10<\/code> \u51e0\u4e4e\u4e00\u6837\uff0c\u800c\u4e14\u4e0a\u9762\u8fd9\u6837\u5199 <code>&amp;&amp;<\/code> \u8fd8\u4f1a\u635f\u5931\u6027\u80fd\uff0c\u591a\u6267\u884c\u4e24\u6761\u6c47\u7f16\uff0c\u6709\u5174\u8da3\u53ef\u4ee5\u81ea\u884c\u53cd\u6c47\u7f16\u3002<\/p>\n\n\n\n<p>\u6211\u4e2a\u4eba\u7279\u522b\u4e0d\u559c\u6b22\u7528 <code class=\"prettyprint\" >int&amp;&amp; b = 10;<\/code> \u6765\u8bb2\u89e3\u53f3\u503c\uff0c\u56e0\u4e3a\u73b0\u5b9e\u5de5\u7a0b\u4ee3\u7801\u6839\u672c\u4e0d\u4f1a\u8fd9\u6837\u5199\uff0c\u80fd\u8fd9\u4e48\u5199\u4ee3\u7801\uff0c\u53ea\u662f\u6070\u597d\u7f16\u8bd1\u5668\u80fd\u8ba9\u4f60\u8fd9\u4e48\u5199\u3002\u4f46\u662f\u8fd9\u6837\u5199\u4ee3\u7801\u53c8\u6709\u4ec0\u4e48\u610f\u4e49\uff0c\u6211\u559c\u6b22\u4e3e\u5b9e\u9645\u6709\u7528\u7684\u4f8b\u5b50\u6765\u8bb2\u89e3\u53f3\u503c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u8bb2\u5230\u8fd9\u91cc\uff0c\u53ef\u80fd\u8bfb\u8005\u4f1a\u6709\u7591\u95ee\uff0c\u6240\u6709\u53d8\u91cf\u90fd\u5e94\u8be5\u6709<strong>\u6807\u8bc6\u7b26<\/strong>\u7684\uff0c\u6ca1\u6709<strong>\u6807\u8bc6\u7b26<\/strong>\u600e\u4e48\u80fd\u53eb\u505a\u53d8\u91cf\u5462\uff1f<\/p>\n\n\n\n<p>\u6211\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\uff0c\u6f14\u793a\u4e00\u4e0b\uff0c\u5927\u5bb6\u5c31\u660e\u767d\u4e86\u3002<\/p>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\r\n\u200b\r\nint main() {\r\n    int a = 2;\r\n    int b = a * 5;\r\n    return 0;\r\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u7ffb\u8bd1\u6210\u6c47\u7f16\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-1.png\" alt=\"1-1\"\/><\/figure>\n\n\n\n<p>\u6211\u4e0a\u56fe\u5708\u51fa\u6765\u7684 <code class=\"prettyprint\" >eax<\/code> \uff0c<strong>\u4ed6\u5c31\u662f\u53f3\u503c<\/strong>\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u4f1a\u4ea7\u751f\u53f3\u503c\uff0c\u662f\u56e0\u4e3a \u6c47\u7f16\uff0cCPU \u6307\u4ee4\u65e0\u6cd5 \u76f4\u63a5\u628a\u7ed3\u679c\u76f4\u63a5\u5b58\u8fdb\u53bb\u53e6\u4e00\u5757\u5185\u5b58\uff0c\u7ed3\u679c\u9700\u8981\u5b58\u5728 <code class=\"prettyprint\" >eax<\/code> \u91cc\u9762\uff0c\u7136\u540e\u518d\u590d\u5236\u5230\u53e6\u4e00\u5757\u5185\u5b58\u3002\u53d8\u91cf\u90fd\u662f\u653e\u5728\u5185\u5b58\u91cc\u9762\u7684\u3002<\/p>\n\n\n\n<p>x86 \u6307\u4ee4\u7684\u5185\u5b58\u5bfb\u5740\u6bd4\u8f83\u5f3a\u5927\uff0c\u6240\u4ee5\u4ea7\u751f\u7684\u53f3\u503c\u6bd4\u8f83\u5c11\uff0c\u800c ARM \u6307\u4ee4\u6ca1\u90a3\u4e48\u5f3a\u5927\uff0c\u4f1a\u4ea7\u751f\u66f4\u591a\u7684\u53f3\u503c\u3002<\/p>\n\n\n\n<p>CPU \u6307\u4ee4\uff0c\u9700\u8981\u4e00\u4e2a\u7f13\u5b58\uff0c\u4e00\u4e2a\u4e2d\u95f4\u7684\u5904\u7406\u3002\u56e0\u6b64\u5c31\u8bde\u751f\u4e86\u53f3\u503c\u8fd9\u4e2a\u6982\u5ff5\uff0c\u53f3\u503c\u8fd9\u4e2a\u6982\u5ff5\uff0c\u4ed6\u4e0d\u662f C++ \u72ec\u6709\u7684\uff0c\u800c\u662f\u5728 C \u8bed\u8a00\u91cc\u9762\u7f16\u7a0b\u5c31\u4f1a\u9047\u5230 \u53f3\u503c\u7684\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u8bf4 \u53f3\u503c \u662f\u4e00\u4e2a\u4e34\u65f6\u503c\uff0c\u662f\u56e0\u4e3a <code class=\"prettyprint\" >eax<\/code> \u5bc4\u5b58\u5668\u5c31\u662f\u4e00\u4e2a\u4e34\u65f6\u503c\u3002<\/p>\n\n\n\n<p>\u4e0a\u9762\u7684 <code class=\"prettyprint\" >a * 5<\/code> \u6267\u884c\u5b8c\u4e4b\u540e\uff0c\u53f3\u503c <code>eax<\/code> \u662f 10\u3002\u6211\u518d\u52a0\u4e00\u4e9b\u4ee3\u7801\u5728\u540e\u9762\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-2.png\" alt=\"1-2\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u540e\u9762\u7684\u4ee3\u7801\uff0c\u4f1a\u8986\u76d6 <code class=\"prettyprint\" >eax<\/code> \u7684\u503c\u3002\u53ea\u8981\u540e\u9762\u7684\u4ee3\u7801\u6267\u884c\uff0c\u4f60\u5c31\u65e0\u6cd5\u627e\u5230\u90a3\u4e2a\u66fe\u7ecf \u7b49\u4e8e 10 \u7684\u53f3\u503c\u53d8\u91cf\u3002\u800c a \uff0cb \u8fd9\u4e9b\u662f <strong>\u5de6\u503c\u53d8\u91cf<\/strong>\uff0c\u4e5f\u53eb \u53ef\u5b9a\u4f4d\u53d8\u91cf\uff0c\u65e0\u8bba\u4ee3\u7801\u600e\u4e48\u8dd1\uff0c\u4f60\u90fd\u80fd\u901a\u8fc7 a \u8fd9\u4e2a\u6807\u8bc6\u7b26\uff0c\u627e\u5230\u90a3\u4e2a\u7b49\u4e8e 2 \u7684\u53d8\u91cf\u3002<\/p>\n\n\n\n<p><strong>\u505a\u4e2a\u5c0f\u603b\u7ed3\uff0c\u53f3\u503c\u662f\u4e34\u65f6\u7684\uff0c\u800c \u5de6\u503c\u662f\u6c38\u4e45\u7684\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4e0b\u9762\u6211\u4eec\u6765\u8bb2\u4e00\u4e2a \u51fd\u6570\u8c03\u7528\uff0c\u503c\u62f7\u8d1d\u7684\u4f8b\u5b50\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;iostream&gt;\r\nusing namespace std;\r\n\u200b\r\nstruct Box {\r\n    int length;   \/\/ \u76d2\u5b50\u7684\u957f\u5ea6\r\n    int breadth;  \/\/ \u76d2\u5b50\u7684\u5bbd\u5ea6\r\n    int height;\r\n};\r\n\u200b\r\nstruct Box getBox() {\r\n    struct Box b1;\r\n    b1.length = 1;\r\n    b1.breadth = 2;\r\n    b1.height = 3;\r\n    return b1;\r\n}\r\n\u200b\r\nint main() {\r\n    struct Box my_box = getBox();\r\n    return 0;\r\n}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-3.png\" alt=\"1-3\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c \u5c40\u90e8\u53d8\u91cf <code class=\"prettyprint\" >b1<\/code> \u7684\u5185\u5b58\u8d77\u59cb\u5730\u5740\u662f <code>ebp-10h<\/code> \uff0c\u4e5f\u5c31\u662f <code>0x00FAFAE0<\/code>\uff0c\u4e00\u76f4\u5230 <code>ebp-8h<\/code>\uff0c\u4e5f\u5c31\u662f <code>b1<\/code> \u53d8\u91cf\u7684\u6570\u636e\u5728 <code>0x00FAFAE0<\/code> ~ <code>0x00FAFAEC<\/code>\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e b1 \u662f\u5c40\u90e8\u53d8\u91cf\uff0c\u6240\u4ee5\u5b83\u7684\u5185\u5b58\u662f\u5728 \u6808\u4e0a\u9762\u7684\uff0c<code class=\"prettyprint\" >0x00FAFAE0<\/code> \u662f\u5c5e\u4e8e\u6808\u5185\u5b58\u7684\u5730\u5740\uff0c\u5f53\u51fd\u6570\u8fd4\u56de\u7684\u65f6\u5019\uff0c<code>ebp<\/code> \u5bc4\u5b58\u5668\u5c31\u4f1a\u6062\u590d\u3002\u540e\u9762\u7684\u4ee3\u7801\u6781\u6709\u53ef\u80fd\u4f1a\u518d\u6b21\u538b\u6808\uff0c\u6240\u4ee5\u51fd\u6570\u8fd4\u56de\u4e4b\u540e <code>0x004FFC18<\/code> \u5730\u5740\u7684\u5185\u5b58\u6570\u636e\u540e\u9762\u6781\u6709\u53ef\u80fd\u4f1a\u88ab\u4fee\u6539\u3002<\/p>\n\n\n\n<p><strong>\u8fd9\u5c31\u662f \u5c40\u90e8\u53d8\u91cf\u4e3a\u4ec0\u4e48\u5728\u51fd\u6570\u8fd4\u56de\u4e4b\u540e\uff0c\u5c31\u6709\u53ef\u80fd\u5931\u6548\u7684\u539f\u56e0<\/strong>\u3002\u6240\u4ee5\u53d8\u91cf\u90fd\u662f\u5728\u5185\u5b58\u91cc\u9762\u7684\uff0c<strong>\u53ea\u662f\u6709\u4e9b\u53d8\u91cf\u5728\u6808\u91cc\uff0c\u6709\u4e9b\u5728\u5806\u91cc\u9762<\/strong>\u3002\u5806\u53d8\u91cf\u4e0d\u4f1a\u88ab<strong>\u9690\u6027\u4fee\u6539<\/strong>\uff0c\u6240\u4ee5\u9700\u8981\u624b\u52a8\u91ca\u653e\u5185\u5b58\u3002\u800c\u6808\u53d8\u91cf\u7684\u5185\u5b58\u4f1a\u968f\u7740\u5404\u4e2a\u51fd\u6570\u8c03\u7528\u88ab\u4fee\u6539\uff0c\u4e0d\u9700\u8981\u4f60\u624b\u52a8\u91ca\u653e\u5185\u5b58\u3002<\/p>\n\n\n\n<p>\u800c\u6211\u4eec\u4e0a\u9762\u7684\u4ee3\u7801\uff0c<code class=\"prettyprint\" >return<\/code> \u8fd4\u56de\u7684\u4e0d\u662f <code>b1<\/code> \u7684\u6307\u9488\uff0c\u800c\u662f <code>b1<\/code> \u7684\u503c\u3002\u6240\u4ee5 b1 \u7684\u503c\u4f1a\u88ab\u62f7\u8d1d\u5230\u4e00\u4e2a\u4e34\u65f6\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c<strong>\u8fd9\u4e2a\u4e34\u65f6\u7684\u5b58\u50a8\u7a7a\u95f4\u5c31\u662f\u53f3\u503c<\/strong>\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-4.png\" alt=\"1-4\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >return b1<\/code> \u88ab\u7ffb\u8bd1\u6210 8 \u53e5\u6c47\u7f16\u4ee3\u7801\u3002\u73b0\u5728\u6765\u4ed4\u7ec6\u8bb2\u89e3\u4e00\u4e0b \u8fd9 8 \u53e5\u6c47\u7f16\u5728\u5e72\u4ec0\u4e48\u3002<\/p>\n\n\n\n<p>1\uff0c<code class=\"prettyprint\" >mov eax,dword ptr [ebp+8]<\/code><\/p>\n\n\n\n<p>\u6211\u4eec\u77e5\u9053\uff0c\u51fd\u6570\u5185\u90e8\u521b\u5efa\u5c40\u57df\u53d8\u91cf\u7684\u65f6\u5019\uff0c <code class=\"prettyprint\" >ebp<\/code> \u662f\u51cf\u7684\uff0c\u4e5f\u5c31\u662f\u53d8\u5f97\u8d8a\u6765\u8d8a\u5c0f\u3002\u800c <code>ebp + 8<\/code> \u4ee3\u8868\u4ec0\u4e48\u610f\u601d\uff1f\u5f80\u4e0a\u52a0\uff0c<strong>\u4ee3\u8868\u8df3\u56de\u5230\u4e0a\u5c42\u8c03\u7528\u8005\u7684\u6808\u5185\u5b58\u91cc\u9762\u3002<\/strong><\/p>\n\n\n\n<p>\u6240\u4ee5\u73b0\u5728 <code class=\"prettyprint\" >eax<\/code> \u5b58\u7684\u662f\u8c03\u7528\u8005\u7684\u6808\u5730\u5740\u3002<\/p>\n\n\n\n<p>\u8865\u5145\uff1a\u4e5f\u53ef\u80fd\u4e0d\u662f\u8c03\u56de\u5230 \u4e0a\u5c42\u8c03\u7528\u8005\u7684\u6808\u5185\u5b58\uff0c\u800c\u662f\u51fd\u6570\u672c\u8eab\u4f1a\u4fdd\u7559\u4e00\u5757\u5185\u5b58\u6765\u653e\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n<p>\u540e\u9762\u7684 7 \u53e5\u6c47\u7f16\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u628a \u5185\u90e8\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u5168\u90e8\u62f7\u8d1d\u5230 \u8c03\u7528\u8005\u7684\u6808\u91cc\u9762\uff0c\u8fd9\u6837\uff0c\u8c03\u7528\u8005\u5c31\u80fd\u62ff\u5230\u8fd9\u4e2a\u8fd4\u56de\u503c\u3002\u4e0b\u9762\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u8c03\u7528\u8005\u662f\u5982\u4f55\u62ff\u8fd9\u4e2a\u8fd4\u56de\u503c\u7684\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-5.png\" alt=\"1-5\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u4ece <code class=\"prettyprint\" >getBox<\/code> \u8fd4\u56de\u4e4b\u540e\uff0c\u8fd8\u4f1a\u8fdb\u884c\u4e00\u6b21\u62f7\u8d1d\uff0c\u9996\u5148 <code>eax<\/code> \u5b58\u50a8\u7684\u5c31\u662f \u8fd4\u56de\u503c\u7684\u8d77\u59cb\u5730\u5740\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u603b\u7ed3\u4e00\u4e0b\u6574\u4e2a \u62f7\u8d1d\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<p>1\uff0creturn b1 \uff0c\u9700\u8981\u628a b1 \u7684\u503c \u590d\u5236\u5230 \u5185\u5b58 A\u3002<\/p>\n\n\n\n<p>2\uff0c\u4ece b1 \u8fd4\u56de\u4e4b\u540e\uff0c<code class=\"prettyprint\" >eax<\/code> \u5c31\u4f1a\u6307\u5411 \u5185\u5b58 A\uff0c\u7136\u540e\u628a \u5185\u5b58 A \u590d\u5236\u5230 \u533f\u540d\u53d8\u91cf\u5185\u5b58B\u3002<\/p>\n\n\n\n<p>3\uff0c\u628a\u533f\u540d\u53d8\u91cf \u8d4b\u503c\u5230 my_box\u3002<\/p>\n\n\n\n<p>\u6d41\u7a0b\u5982\u56fe\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u5c40\u90e8\u53d8\u91cf b1 -&gt; \u5185\u5b58A -&gt; \u533f\u540d\u5185\u5b58B -&gt; \u53d8\u91cf my_box\u3002<\/pre>\n\n\n\n<p>\u503c\u4f20\u9012\uff0c\u7ecf\u5386\u4e86 3 \u6b21 \u5185\u5b58\u62f7\u8d1d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u73b0\u5728\u6211\u7528\u4e00\u4e9b hack \u7684\u65b9\u6cd5\u6765\u4f18\u5316\u4e00\u4e0b\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >struct Box {\r\n    int length;   \/\/ \u76d2\u5b50\u7684\u957f\u5ea6\r\n    int breadth;  \/\/ \u76d2\u5b50\u7684\u5bbd\u5ea6\r\n    int height;\r\n};\r\n\u200b\r\nstruct Box* getBox() {\r\n    struct Box b1;\r\n    b1.length = 1;\r\n    b1.breadth = 2;\r\n    b1.height = 3;\r\n    return &amp;b1;\r\n}\r\n\u200b\r\nint main() {\r\n    struct Box my_box;\r\n    my_box = *(getBox());\r\n    return 0;\r\n}<\/code><\/pre>\n\n\n\n<p>\u6211\u76f4\u63a5\u8fd4\u56de\u5c40\u90e8\u53d8\u91cf\u7684\u5185\u5b58\u6307\u9488\uff0c<strong>\u8fd9\u662f\u4e00\u79cd\u4e0d\u6b63\u89c4\u7684\u505a\u6cd5<\/strong>\uff0c\u4f46\u662f\u56e0\u4e3a\u8fd9\u4e2a\u6307\u9488\u7684\u5185\u5b58\u8fd4\u56de\u4e4b\u540e\u5c31\u88ab\u7acb\u5373\u53d6\u503c\u4e86\uff0c\u6240\u4ee5\u83b7\u53d6\u5230\u7684\u662f\u6b63\u786e\u7684\u6570\u636e\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-6.png\" alt=\"1-6\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >getBox()<\/code> \u51fd\u6570\u7684\u6c47\u7f16\u4ee3\u7801\u5c11\u4e86\u51e0\u884c\u3002\u5728\u770b\u4e00\u4e0b main \u51fd\u6570\u7684\u6c47\u7f16\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-7.png\" alt=\"1-7\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u53ea\u8fdb\u884c\u4e86\u4e00\u6b21\u5185\u5b58\u62f7\u8d1d\u3002<strong>\u76f4\u63a5\u628a\u5c40\u90e8\u53d8\u91cf\u7684\u5185\u5b58\u62f7\u8d1d\u5230\u4e0a\u5c42\u8c03\u7528\u8005\u7684 <code class=\"prettyprint\" >my_box<\/code> \u91cc\u9762<\/strong>\uff0c\u56e0\u4e3a <code>getBox<\/code> \u51fd\u6570\u8c03\u7528\u4e4b\u540e\uff0c\u5c31\u7acb\u5373\u53d6\u4ed6\u7684\u5185\u5b58\uff0c\u6240\u4ee5\u4ed6\u7684\u5185\u5b58\u8fd8\u6ca1\u6709\u635f\u574f\u3002\u53ef\u4ee5\u770b\u5230 <code>my_box<\/code> \u7684\u503c\u5982\u4e0b\uff0c\u6b63\u5e38\u88ab\u8d4b\u503c\u4e3a 1,2,3\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-8.png\" alt=\"1-8\"\/><\/figure>\n\n\n\n<p>\u8fd9\u79cd hack \u7684\u505a\u6cd5\uff0c\u51cf\u5c11\u4e86 \u4e24\u6b21 \u5185\u5b58\u62f7\u8d1d\uff0c\u5927\u5927\u63d0\u5347\u4e86\u6027\u80fd\uff0c\u4f46\u6bd5\u7adf\u8fd9\u4e0d\u662f\u4e00\u79cd\u6b63\u89c4\u7684\u5199\u6cd5\uff0c\u7a0d\u4e0d\u6ce8\u610f\u5c31\u4f1a\u5bfc\u81f4\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a\u5c40\u90e8\u53d8\u91cf\u7684\u5185\u5b58\u4e5f\u662f\u5185\u5b58\uff0c\u90fd\u662f\u6211\u4eec\u53ef\u4ee5\u63a7\u5236\u7684\uff0c\u65e2\u7136\u77e5\u9053\u4e86\u6570\u636e\u5728\u54ea\u91cc\uff0c\u76f4\u63a5 copy \u4e00\u6b21\u7ed9\u53d8\u91cf\u4e0d\u5c31\u884c\u4e86\u3002\u7531\u6b64\u53ef\u89c1\uff0c\u503c\u4f20\u9012\u662f\u6bd4\u8f83\u6d88\u8017\u6027\u80fd\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u800c\u53f3\u503c\u5f15\u7528\uff0c\u4e5f\u662f\u4e3a\u4e86\u51cf\u5c11\u5185\u5b58\u62f7\u8d1d\uff0c\u4e0b\u9762\u5c31\u6765\u6f14\u793a\u4e00\u4e0b C++ \u91cc\u9762\u7684\u53f3\u503c\u5f15\u7528\u662f\u5982\u4f55\u51cf\u5c11\u5185\u5b58\u62f7\u8d1d\u7684\u3002<\/p>\n\n\n\n<p>\u5148\u6765\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int getNum() {\r\n    int num = 5;\r\n    return num;\r\n}\r\n\u200b\r\nint main() {\r\n    int&amp;&amp; my_box = getNum();\r\n    return 0;\r\n}<\/code><\/pre>\n\n\n\n<p>\u53cd\u6c47\u7f16\u540e\u5982\u4e0b\uff1b<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/08\/rvalue-b-1-9.png\" alt=\"1-9\"\/><\/figure>\n\n\n\n<p>\u4e0a\u56fe\u4e2d\uff0c<code class=\"prettyprint\" >my_box<\/code> \u662f <code>0x010FFA64<\/code>\uff0c\u5e76\u6ca1\u6709\u51cf\u5c11\u4ec0\u4e48\u5185\u5b58\u62f7\u8d1d\uff0c\u53cd\u800c\u6bd4 \u4e0d\u7528 <code>&amp;&amp;<\/code> \u591a\u4e86\u4e24\u53e5\u6c47\u7f16\uff0c\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cmy_box \u7c7b\u4f3c\u4e8e\u4e00\u7ea7\u6307\u9488\uff0c\u4ed6\u6307\u5411\u7684\u5185\u5b58\u624d\u662f 5 \u3002my_box \u672c\u8eab\u4e0d\u662f 5\uff0c\u8fd9\u5c31\u662f\u90a3\u4e24\u53e5\u6c47\u7f16\u5e72\u7684\u6d3b\u3002<\/p>\n\n\n\n<p>\u628a <code class=\"prettyprint\" >eax<\/code> \u7684\u503c\u590d\u5236\u5230 <code>ebp-18h<\/code> \uff0c\u8ba9\u53f3\u503c\u7684\u751f\u547d\u5468\u671f\u5ef6\u957f\u3002\u7136\u540e\u628a my_box \u6307\u5411 <code>ebp-18h<\/code> \uff0c\u8fd9\u6837 my_box \u5c31\u7c7b\u4f3c\u4e00\u7ea7\u6307\u9488\u4e86\u3002<\/p>\n\n\n\n<p>\u7531\u6b64\u53ef\u5c06\uff0c<strong>\u4e0a\u9762\u8fd9\u6837\u4f7f\u7528\u53f3\u503c\u5f15\u7528 \u5e76\u6ca1\u6709\u4ec0\u4e48\u5375\u7528<\/strong>\uff0c\u8fd8\u4f1a\u591a\u6267\u884c\u4e24\u53e5\u6c47\u7f16\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4e0b\u9762\u5c31\u6765\u8bb2\u4e00\u4e2a \u53f3\u503c\u5f15\u7528\u771f\u6b63\u53d1\u6325\u4ed6\u7684\u4f5c\u7528\u7684\u573a\u666f\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>\u5f85\u5199.....<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C++ \u91cc\u9762\u6709\u4e00\u4e2a\u975e\u5e38\u72ec\u7279\u7684\u529f\u80fd\uff0c\u53eb 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