{"id":54359,"date":"2025-08-13T03:00:33","date_gmt":"2025-08-12T19:00:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54359.html"},"modified":"2025-08-13T03:00:33","modified_gmt":"2025-08-12T19:00:33","slug":"%e6%89%8b%e5%86%99%e7%bc%96%e8%af%91%e5%99%a8%ef%bc%9a%e4%bb%8e%e8%af%8d%e6%b3%95%e5%88%b0%e4%bb%a3%e7%a0%81%e7%94%9f%e6%88%90%e7%9a%84%e6%8a%80%e6%9c%af%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54359.html","title":{"rendered":"\u624b\u5199\u7f16\u8bd1\u5668\uff1a\u4ece\u8bcd\u6cd5\u5230\u4ee3\u7801\u751f\u6210\u7684\u6280\u672f\u6df1\u5ea6\u89e3\u6790"},"content":{"rendered":"<p>\u624b\u5199\u7f16\u8bd1\u5668&#xff08;Handwritten Compiler&#xff09;\u6307\u4e0d\u4f9d\u8d56 Lex\/Yacc\u3001ANTLR \u7b49\u751f\u6210\u5de5\u5177&#xff0c;\u5b8c\u5168\u7531\u7a0b\u5e8f\u5458\u4f7f\u7528\u901a\u7528\u7f16\u7a0b\u8bed\u8a00&#xff08;\u5982 C&#043;&#043;\u3001Rust\u3001Go&#xff09;\u5b9e\u73b0\u7f16\u8bd1\u5668\u524d\u7aef&#xff08;Frontend&#xff09;\u4e43\u81f3\u540e\u7aef&#xff08;Backend&#xff09;\u7684\u5168\u8fc7\u7a0b\u3002\u5176\u6838\u5fc3\u4ef7\u503c\u5728\u4e8e\u7ec6\u7c92\u5ea6\u63a7\u5236\u3001\u6781\u81f4\u4f18\u5316\u3001\u6559\u5b66\u7814\u7a76\u3001DSL \u9ad8\u5ea6\u5b9a\u5236\u5316\u3002<\/p>\n<hr \/>\n<h3>1. \u8bcd\u6cd5\u5206\u6790&#xff08;Lexical Analysis&#xff09;<\/h3>\n<h4>\u76ee\u6807<\/h4>\n<p>\u5c06\u5b57\u7b26\u6d41&#xff08;char* \u6216 std::string_view&#xff09;\u8f6c\u6362\u4e3a\u6807\u8bb0\u6d41&#xff08;Token Stream&#xff09;&#xff0c;\u6bcf\u4e2a Token \u5305\u542b&#xff1a;<\/p>\n<ul>\n<li>\u7c7b\u578b&#xff08;TokenType&#xff0c;\u5982 TK_IDENTIFIER, TK_PLUS, KW_IF&#xff09;<\/li>\n<li>\u539f\u59cb\u6587\u672c&#xff08;std::string_view&#xff0c;\u907f\u514d\u62f7\u8d1d&#xff09;<\/li>\n<li>\u4f4d\u7f6e\u4fe1\u606f&#xff08;Location&#xff1a;\u884c\u3001\u5217\u3001\u6587\u4ef6 ID&#xff09;<\/li>\n<\/ul>\n<h4>\u5b9e\u73b0\u6280\u672f&#xff1a;\u786e\u5b9a\u6027\u6709\u9650\u81ea\u52a8\u673a&#xff08;DFA&#xff09;\u9a71\u52a8<\/h4>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">TokenType<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    TK_EOF<span class=\"token punctuation\">,<\/span><br \/>\n    TK_IDENTIFIER<span class=\"token punctuation\">,<\/span><br \/>\n    TK_NUMBER<span class=\"token punctuation\">,<\/span><br \/>\n    TK_PLUS<span class=\"token punctuation\">,<\/span> TK_MINUS<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span><br \/>\n    KW_IF<span class=\"token punctuation\">,<\/span> KW_WHILE<span class=\"token punctuation\">,<\/span>    <span class=\"token comment\">\/* &#8230; *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Token<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    TokenType type<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string_view text<span class=\"token punctuation\">;<\/span><br \/>\n    Location loc<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Lexer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> input<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u8f93\u5165\u6307\u9488<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> ptr<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u5f53\u524d\u626b\u63cf\u4f4d\u7f6e<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> line<span class=\"token punctuation\">,<\/span> column<span class=\"token punctuation\">;<\/span><br \/>\n    Token next_token<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u9884\u8bfb Token&#xff08;\u7528\u4e8e lookahead&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> has_next<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">Lexer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> input<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">input<\/span><span class=\"token punctuation\">(<\/span>input<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ptr<\/span><span class=\"token punctuation\">(<\/span>input<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">line<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">column<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">has_next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>    Token <span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u4e3b\u63a5\u53e3<\/span><br \/>\n    Token <span class=\"token function\">scan<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u6838\u5fc3\u626b\u63cf\u903b\u8f91<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">skip_whitespace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8df3\u8fc7\u7a7a\u767d\u4e0e\u6ce8\u91ca<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u626b\u63cf\u6838\u5fc3&#xff1a;\u72b6\u6001\u673a &#043; \u67e5\u8868\u4f18\u5316<\/h4>\n<p>Token <span class=\"token class-name\">Lexer<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">scan<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">skip_whitespace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> start <span class=\"token operator\">&#061;<\/span> ptr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>ptr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span>TK_EOF<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span>line<span class=\"token punctuation\">,<\/span> column<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;&#043;&#039;<\/span><span class=\"token operator\">:<\/span>  <span class=\"token function\">advance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span>TK_PLUS<span class=\"token punctuation\">,<\/span>  <span class=\"token string\">&#034;&#043;&#034;<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token function\">loc<\/span><span class=\"token punctuation\">(<\/span>start<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;-&#039;<\/span><span class=\"token operator\">:<\/span>  <span class=\"token function\">advance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span>TK_MINUS<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;-&#034;<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token function\">loc<\/span><span class=\"token punctuation\">(<\/span>start<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;0&#039;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token number\">.&#039;9&#039;<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token function\">scan_number<\/span><span class=\"token punctuation\">(<\/span>start<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token number\">.&#039;<\/span>z<span class=\"token number\">&#039;<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;A&#039;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token number\">.&#039;<\/span>Z<span class=\"token number\">&#039;<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;_&#039;<\/span><span class=\"token operator\">:<\/span>        <span class=\"token keyword\">return<\/span> <span class=\"token function\">scan_identifier<\/span><span class=\"token punctuation\">(<\/span>start<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ &#8230; \u5176\u4ed6\u5b57\u7b26<\/span><br \/>\n        <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n            <span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Unexpected character: &#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>ptr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u5173\u952e\u4f18\u5316\u70b9&#xff1a;<\/h5>\n<ul>\n<li>\u96f6\u62f7\u8d1d&#xff1a;\u4f7f\u7528 std::string_view \u6307\u5411\u6e90\u7801\u5b50\u4e32&#xff0c;\u907f\u514d\u9891\u7e41 std::string \u6784\u9020\u3002<\/li>\n<li>\u5173\u952e\u5b57\u54c8\u5e0c\u8868&#xff1a;\u6807\u8bc6\u7b26\u8bc6\u522b\u540e&#xff0c;\u67e5\u9759\u6001\u54c8\u5e0c\u8868\u5224\u65ad\u662f\u5426\u4e3a\u5173\u952e\u5b57\u3002<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>unordered_map<span class=\"token operator\">&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string_view<span class=\"token punctuation\">,<\/span> TokenType<span class=\"token operator\">&gt;<\/span> keyword_map <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;if&#034;<\/span><span class=\"token punctuation\">,<\/span> KW_IF<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;while&#034;<\/span><span class=\"token punctuation\">,<\/span> KW_WHILE<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<\/li>\n<li>DFA \u8868\u9a71\u52a8&#xff08;\u9ad8\u7ea7&#xff09;&#xff1a;\u5c06\u72b6\u6001\u8f6c\u79fb\u7f16\u7801\u4e3a\u4e8c\u7ef4\u8868&#xff0c;\u7528 state &#061; table[state][char_class] \u52a0\u901f\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>2. \u8bed\u6cd5\u5206\u6790&#xff08;Syntax Analysis&#xff09;<\/h3>\n<h4>\u4e3b\u6d41\u9009\u62e9&#xff1a;\u9012\u5f52\u4e0b\u964d\u89e3\u6790&#xff08;Recursive Descent Parsing, RDP&#xff09;<\/h4>\n<p>\u9002\u7528\u4e8e LL(k) \u6587\u6cd5&#xff0c;\u624b\u5199\u9996\u9009&#xff0c;\u56e0\u5176&#xff1a;<\/p>\n<ul>\n<li>\u63a7\u5236\u6d41\u6e05\u6670<\/li>\n<li>\u6613\u4e8e\u63d2\u5165\u8bed\u4e49\u52a8\u4f5c&#xff08;\u5982 AST \u6784\u9020&#xff09;<\/li>\n<li>\u9519\u8bef\u6062\u590d\u7075\u6d3b<\/li>\n<\/ul>\n<h4>\u6d88\u9664\u5de6\u9012\u5f52&#xff08;Left Recursion Elimination&#xff09;<\/h4>\n<p>\u539f\u59cb\u8868\u8fbe\u5f0f\u6587\u6cd5&#xff08;\u5de6\u9012\u5f52&#xff09;&#xff1a;<\/p>\n<p>Expr \u2192 Expr &#039;&#043;&#039; Term | Term<\/p>\n<p>\u8f6c\u6362\u4e3a\u53f3\u9012\u5f52&#xff1a;<\/p>\n<p>Expr  \u2192 Term Expr&#039;<br \/>\nExpr&#039; \u2192 &#039;&#043;&#039; Term Expr&#039; | \u03b5<\/p>\n<p>\u5bf9\u5e94 C&#043;&#043; \u5b9e\u73b0&#xff1a;<\/p>\n<p>std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>ExprAST<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">parse_expr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">auto<\/span> LHS <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">parse_term<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">parse_expr_rhs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>LHS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>ExprAST<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">parse_expr_rhs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> min_precedence<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>ExprAST<span class=\"token operator\">&gt;<\/span> LHS<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> tok_prec <span class=\"token operator\">&#061;<\/span> get <span class=\"token function\">precedence<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">peek<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>type<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tok_prec <span class=\"token operator\">&lt;<\/span> min_precedence<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        Token op <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">consume<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ consume &#039;&#043;&#039;\/&#039;-&#039;<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> RHS <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">parse_term<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> next_prec <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">get_precedence<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">peek<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>type<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tok_prec <span class=\"token operator\">&lt;<\/span> next_prec<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            RHS <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">parse_expr_rhs<\/span><span class=\"token punctuation\">(<\/span>tok_prec <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>RHS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        LHS <span class=\"token operator\">&#061;<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">make_unique<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>BinaryExprAST<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>LHS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> op<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>RHS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> LHS<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6280\u5de7&#xff1a;\u4f7f\u7528\u201c\u4f18\u5148\u7ea7\u9a71\u52a8\u89e3\u6790\u201d&#xff08;Pratt Parsing&#xff09;\u9ad8\u6548\u5904\u7406\u8868\u8fbe\u5f0f&#xff0c;\u65f6\u95f4\u590d\u6742\u5ea6 O(n)\u3002<\/p>\n<hr \/>\n<h3>3. \u62bd\u8c61\u8bed\u6cd5\u6811&#xff08;AST&#xff09;\u8bbe\u8ba1<\/h3>\n<h4>\u8bbe\u8ba1\u539f\u5219<\/h4>\n<ul>\n<li>\u4e0d\u53ef\u53d8\u6027&#xff08;Immutable&#xff09;&#xff1a;AST \u8282\u70b9\u6784\u9020\u540e\u4e0d\u5e94\u4fee\u6539\u3002<\/li>\n<li>\u591a\u6001\u6027&#xff1a;\u4f7f\u7528\u865a\u51fd\u6570\u6216\u6807\u7b7e\u8054\u5408&#xff08;Tagged Union&#xff09;\u3002<\/li>\n<li>\u4f4d\u7f6e\u4fe1\u606f\u5d4c\u5165&#xff1a;\u6bcf\u4e2a\u8282\u70b9\u643a\u5e26 Location \u7528\u4e8e\u9519\u8bef\u62a5\u544a\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Location<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">int<\/span> line<span class=\"token punctuation\">,<\/span> col<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ASTNode<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">virtual<\/span> <span class=\"token operator\">~<\/span><span class=\"token function\">ASTNode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">default<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">virtual<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>ASTVisitor<span class=\"token operator\">*<\/span> v<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Location loc<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ExprAST<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ASTNode<\/span><\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">BinaryExprAST<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ExprAST<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>ExprAST<span class=\"token operator\">&gt;<\/span> lhs<span class=\"token punctuation\">,<\/span> rhs<span class=\"token punctuation\">;<\/span><br \/>\n    Token op<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>ASTVisitor<span class=\"token operator\">*<\/span> v<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span> <span class=\"token punctuation\">{<\/span> v<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>4. \u8bed\u4e49\u5206\u6790&#xff08;Semantic Analysis&#xff09;<\/h3>\n<h4>\u6838\u5fc3&#xff1a;\u7b26\u53f7\u8868&#xff08;Symbol Table&#xff09;\u4e0e\u7c7b\u578b\u7cfb\u7edf<\/h4>\n<h5>\u7b26\u53f7\u8868\u7ed3\u6784&#xff1a;\u4f5c\u7528\u57df\u6808&#xff08;Scope Stack&#xff09;<\/h5>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Symbol<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>string name<span class=\"token punctuation\">;<\/span><br \/>\n    Type<span class=\"token operator\">*<\/span> type<span class=\"token punctuation\">;<\/span><br \/>\n    StorageKind storage<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ local, global, param<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> offset<span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ frame offset<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Scope<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>unordered_map<span class=\"token operator\">&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>Symbol<span class=\"token operator\">&gt;&gt;<\/span> symbols<span class=\"token punctuation\">;<\/span><br \/>\n    Scope<span class=\"token operator\">*<\/span> parent<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">insert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span> name<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>Symbol<span class=\"token operator\">&gt;<\/span> sym<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Symbol<span class=\"token operator\">*<\/span> <span class=\"token function\">lookup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span> name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5411\u4e0a\u67e5\u627e<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SemanticAnalyzer<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ASTVisitor<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>stack<span class=\"token operator\">&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>Scope<span class=\"token operator\">&gt;&gt;<\/span> scope_stack<span class=\"token punctuation\">;<\/span><br \/>\n    Type<span class=\"token operator\">*<\/span> current_function_return_type<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span>BinaryExprAST<span class=\"token operator\">&amp;<\/span> expr<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span>VarDeclAST<span class=\"token operator\">&amp;<\/span> decl<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span>IdentifierExprAST<span class=\"token operator\">&amp;<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u7c7b\u578b\u68c0\u67e5\u7b97\u6cd5&#xff08;\u4ee5 BinaryExpr \u4e3a\u4f8b&#xff09;<\/h5>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token class-name\">SemanticAnalyzer<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span>BinaryExprAST<span class=\"token operator\">&amp;<\/span> expr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    expr<span class=\"token punctuation\">.<\/span>lhs<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    expr<span class=\"token punctuation\">.<\/span>rhs<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    Type<span class=\"token operator\">*<\/span> lhs_type <span class=\"token operator\">&#061;<\/span> expr<span class=\"token punctuation\">.<\/span>lhs<span class=\"token operator\">-&gt;<\/span>type<span class=\"token punctuation\">;<\/span><br \/>\n    Type<span class=\"token operator\">*<\/span> rhs_type <span class=\"token operator\">&#061;<\/span> expr<span class=\"token punctuation\">.<\/span>rhs<span class=\"token operator\">-&gt;<\/span>type<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>expr<span class=\"token punctuation\">.<\/span>op<span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">&#061;&#061;<\/span> TK_PLUS<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>lhs_type<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">is_numeric<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> rhs_type<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">is_numeric<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            expr<span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">unify_numeric<\/span><span class=\"token punctuation\">(<\/span>lhs_type<span class=\"token punctuation\">,<\/span> rhs_type<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7c7b\u578b\u63d0\u5347<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>lhs_type<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">is_pointer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> rhs_type<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">is_integral<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            expr<span class=\"token punctuation\">.<\/span>type <span class=\"token operator\">&#061;<\/span> lhs_type<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6307\u9488\u7b97\u672f<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Invalid operand types for &#043;&#034;<\/span><span class=\"token punctuation\">,<\/span> expr<span class=\"token punctuation\">.<\/span>loc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230; \u5176\u4ed6\u64cd\u4f5c\u7b26<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>5. \u4e2d\u95f4\u8868\u793a&#xff08;Intermediate Representation, IR&#xff09;<\/h3>\n<h4>\u9009\u62e9&#xff1a;\u4e09\u5730\u5740\u7801&#xff08;Three-Address Code, TAC&#xff09;\u6216 SSA \u5f62\u5f0f<\/h4>\n<h5>TAC \u793a\u4f8b&#xff1a;<\/h5>\n<p><span class=\"token comment\">\/\/ a &#061; b &#043; c * d<\/span><br \/>\nt1 <span class=\"token operator\">&#061;<\/span> c <span class=\"token operator\">*<\/span> d<br \/>\nt2 <span class=\"token operator\">&#061;<\/span> b <span class=\"token operator\">&#043;<\/span> t1<br \/>\na <span class=\"token operator\">&#061;<\/span> t2<\/p>\n<h5>\u5b9e\u73b0 IR \u6307\u4ee4&#xff1a;<\/h5>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Opcode<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    OP_ADD<span class=\"token punctuation\">,<\/span> OP_SUB<span class=\"token punctuation\">,<\/span> OP_MUL<span class=\"token punctuation\">,<\/span> OP_DIV<span class=\"token punctuation\">,<\/span><br \/>\n    OP_LOAD<span class=\"token punctuation\">,<\/span> OP_STORE<span class=\"token punctuation\">,<\/span> OP_CALL<span class=\"token punctuation\">,<\/span><br \/>\n    OP_JMP<span class=\"token punctuation\">,<\/span> OP_JZ<span class=\"token punctuation\">,<\/span> OP_RET<br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">IRInstruction<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Opcode op<span class=\"token punctuation\">;<\/span><br \/>\n    Operand dest<span class=\"token punctuation\">,<\/span> src1<span class=\"token punctuation\">,<\/span> src2<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>optional<span class=\"token operator\">&lt;<\/span>Label<span class=\"token operator\">&gt;<\/span> label<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u4ece AST \u751f\u6210 TAC&#xff08;\u4f7f\u7528 Visitor \u6a21\u5f0f&#xff09;<\/h5>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">IRGenerator<\/span> <span class=\"token operator\">:<\/span> <span class=\"token base-clause\"><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ASTVisitor<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>vector<span class=\"token operator\">&lt;<\/span>std<span class=\"token double-colon punctuation\">::<\/span>unique_ptr<span class=\"token operator\">&lt;<\/span>IRInstruction<span class=\"token operator\">&gt;&gt;<\/span> instructions<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> temp_counter <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    Temp <span class=\"token function\">new_temp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> Temp<span class=\"token punctuation\">{<\/span>temp_counter<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    Temp <span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span>BinaryExprAST<span class=\"token operator\">&amp;<\/span> expr<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">override<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        Temp lhs <span class=\"token operator\">&#061;<\/span> expr<span class=\"token punctuation\">.<\/span>lhs<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        Temp rhs <span class=\"token operator\">&#061;<\/span> expr<span class=\"token punctuation\">.<\/span>rhs<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        Temp result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">new_temp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        Opcode op <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">get_opcode<\/span><span class=\"token punctuation\">(<\/span>expr<span class=\"token punctuation\">.<\/span>op<span class=\"token punctuation\">.<\/span>type<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        instructions<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>std<span class=\"token double-colon punctuation\">::<\/span><span class=\"token generic-function\"><span class=\"token function\">make_unique<\/span><span class=\"token generic class-name\"><span class=\"token operator\">&lt;<\/span>IRInst<span class=\"token operator\">&gt;<\/span><\/span><\/span><span class=\"token punctuation\">(<\/span>op<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">,<\/span> lhs<span class=\"token punctuation\">,<\/span> rhs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>6. \u4ee3\u7801\u751f\u6210&#xff08;Code Generation&#xff09;<\/h3>\n<h4>\u76ee\u6807&#xff1a;x86-64 \u6c47\u7f16&#xff08;AT&amp;T \u8bed\u6cd5&#xff09;<\/h4>\n<h5>\u5bc4\u5b58\u5668\u5206\u914d&#xff1a;\u7ebf\u6027\u626b\u63cf&#xff08;Linear Scan&#xff09;\u6216\u56fe\u7740\u8272&#xff08;Graph Coloring&#xff09;<\/h5>\n<p>\u4ee5\u7ebf\u6027\u626b\u63cf\u4e3a\u4f8b&#xff1a;<\/p>\n<li>\u8ba1\u7b97\u6bcf\u4e2a\u53d8\u91cf\u7684\u6d3b\u8dc3\u533a\u95f4&#xff08;Live Range&#xff09;<\/li>\n<li>\u7ef4\u62a4\u6d3b\u8dc3\u53d8\u91cf\u96c6\u5408&#xff0c;\u6309\u533a\u95f4\u8d77\u59cb\u6392\u5e8f<\/li>\n<li>\u5206\u914d\u7269\u7406\u5bc4\u5b58\u5668\u6216\u6ea2\u51fa\u5230\u6808<\/li>\n<h5>\u6307\u4ee4\u9009\u62e9&#xff1a;\u6a21\u5f0f\u5339\u914d &#043; \u6a21\u677f<\/h5>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token class-name\">CodeGenerator<\/span><span class=\"token double-colon punctuation\">::<\/span><span class=\"token function\">visit<\/span><span class=\"token punctuation\">(<\/span>BinaryExprAST<span class=\"token operator\">&amp;<\/span> expr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Reg lhs <span class=\"token operator\">&#061;<\/span> expr<span class=\"token punctuation\">.<\/span>lhs<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Reg rhs <span class=\"token operator\">&#061;<\/span> expr<span class=\"token punctuation\">.<\/span>rhs<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Reg result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">alloc_reg<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5206\u914d\u5bc4\u5b58\u5668<\/span><\/p>\n<p>    <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>expr<span class=\"token punctuation\">.<\/span>op<span class=\"token punctuation\">.<\/span>type<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> TK_PLUS<span class=\"token operator\">:<\/span><br \/>\n            <span class=\"token function\">emit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;addq %s, %s&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">reg_name<\/span><span class=\"token punctuation\">(<\/span>rhs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">reg_name<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> TK_MUL<span class=\"token operator\">:<\/span><br \/>\n            <span class=\"token function\">emit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;imulq %s, %s&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">reg_name<\/span><span class=\"token punctuation\">(<\/span>rhs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">reg_name<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u8c03\u7528\u7ea6\u5b9a&#xff08;x86-64 System V ABI&#xff09;<\/h5>\n<ul>\n<li>\u524d 6 \u4e2a\u6574\u6570\u53c2\u6570&#xff1a;%rdi, %rsi, %rdx, %rcx, %r8, %r9<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;%rax<\/li>\n<li>\u88ab\u8c03\u7528\u8005\u4fdd\u5b58&#xff1a;%rbx, %rbp, %r12-%r15<\/li>\n<\/ul>\n<hr \/>\n<h3>7. \u4f18\u5316\u6280\u672f&#xff08;\u624b\u5199\u5b9e\u73b0&#xff09;<\/h3>\n<h4>\u5e38\u89c1\u4f18\u5316 Pass&#xff08;\u904d\u5386 IR \u6216 AST&#xff09;<\/h4>\n<table>\n<tr>\u4f18\u5316\u63cf\u8ff0\u5b9e\u73b0\u6280\u672f<\/tr>\n<tbody>\n<tr>\n<td>\u5e38\u91cf\u6298\u53e0<\/td>\n<td>3 &#043; 4 \u2192 7<\/td>\n<td>\u5728 IR \u751f\u6210\u65f6\u8fdb\u884c\u5e38\u91cf\u4f20\u64ad<\/td>\n<\/tr>\n<tr>\n<td>\u6b7b\u4ee3\u7801\u6d88\u9664<\/td>\n<td>\u79fb\u9664\u4e0d\u53ef\u8fbe\u57fa\u672c\u5757<\/td>\n<td>\u6784\u5efa CFG&#xff0c;\u8fdb\u884c\u53ef\u8fbe\u6027\u5206\u6790<\/td>\n<\/tr>\n<tr>\n<td>\u516c\u5171\u5b50\u8868\u8fbe\u5f0f\u6d88\u9664<\/td>\n<td>a&#061;b&#043;c; d&#061;b&#043;c \u2192 t&#061;b&#043;c; a&#061;t; d&#061;t<\/td>\n<td>\u54c8\u5e0c\u8868\u8fbe\u5f0f&#xff0c;\u67e5\u627e\u91cd\u590d\u8ba1\u7b97<\/td>\n<\/tr>\n<tr>\n<td>\u5faa\u73af\u4e0d\u53d8\u91cf\u5916\u63d0<\/td>\n<td>\u5c06\u5faa\u73af\u5185\u4e0d\u53d8\u8ba1\u7b97\u79fb\u51fa<\/td>\n<td>\u68c0\u6d4b\u5faa\u73af\u5185\u8868\u8fbe\u5f0f\u662f\u5426\u4f9d\u8d56\u5faa\u73af\u53d8\u91cf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>8. \u9519\u8bef\u5904\u7406\u4e0e\u8bca\u65ad<\/h3>\n<h4>\u7cbe\u51c6\u9519\u8bef\u62a5\u544a<\/h4>\n<ul>\n<li>\u4f7f\u7528 Location \u5b9a\u4f4d\u6e90\u7801\u884c\u3002<\/li>\n<li>\u63d0\u4f9b\u4e0a\u4e0b\u6587&#xff08;\u5982\u6253\u5370\u51fa\u9519\u884c&#xff09;\u3002<\/li>\n<li>\u652f\u6301\u591a\u9519\u8bef\u6536\u96c6&#xff08;\u4e0d\u56e0\u4e00\u4e2a\u9519\u8bef\u7ec8\u6b62&#xff09;\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Diagnostics<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>vector<span class=\"token operator\">&lt;<\/span>Diagnostic<span class=\"token operator\">&gt;<\/span> errors<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token double-colon punctuation\">::<\/span>string<span class=\"token operator\">&amp;<\/span> msg<span class=\"token punctuation\">,<\/span> Location loc<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>ERROR<span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">,<\/span> loc<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">print_source_context<\/span><span class=\"token punctuation\">(<\/span>loc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>9. \u6027\u80fd\u8003\u91cf<\/h3>\n<ul>\n<li>\u5185\u5b58\u7ba1\u7406&#xff1a;\u4f7f\u7528\u5bf9\u8c61\u6c60&#xff08;Object Pool&#xff09;\u6216 Arena Allocator \u51cf\u5c11 new\/delete \u5f00\u9500\u3002<\/li>\n<li>\u5b57\u7b26\u4e32\u5904\u7406&#xff1a;string_view &#043; \u5b57\u7b26\u4e32\u9a7b\u7559&#xff08;String Interning&#xff09;\u907f\u514d\u91cd\u590d\u3002<\/li>\n<li>\u7f13\u5b58\u53cb\u597d&#xff1a;IR \u6307\u4ee4\u8fde\u7eed\u5b58\u50a8&#xff0c;\u7b26\u53f7\u8868\u4f7f\u7528\u54c8\u5e0c\u8868\u3002<\/li>\n<li>\u5e76\u884c\u7f16\u8bd1&#xff1a;\u73b0\u4ee3\u7f16\u8bd1\u5668\u652f\u6301\u591a\u6587\u4ef6\u5e76\u884c\u7f16\u8bd1&#xff08;\u9700\u72ec\u7acb\u4e0a\u4e0b\u6587&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>10. \u5de5\u4e1a\u7ea7\u5b9e\u8df5\u53c2\u8003<\/h3>\n<ul>\n<li>Clang&#xff1a;C&#043;&#043; \u524d\u7aef&#xff0c;\u624b\u5199\u9012\u5f52\u4e0b\u964d\u89e3\u6790\u5668 &#043; AST\u3002<\/li>\n<li>Rustc&#xff1a;\u4f7f\u7528 librustc_parse \u624b\u5199 LL(1) \u89e3\u6790\u5668\u3002<\/li>\n<li>V8 Ignition&#xff1a;JavaScript \u5b57\u8282\u7801\u751f\u6210\u5668\u624b\u5199\u3002<\/li>\n<li>LuaJIT&#xff1a;\u9ad8\u5ea6\u4f18\u5316\u7684\u624b\u5199\u6c47\u7f16\u751f\u6210\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u603b\u7ed3&#xff1a;\u624b\u5199 vs \u5de5\u5177\u751f\u6210<\/h3>\n<table>\n<tr>\u7ef4\u5ea6\u624b\u5199\u7f16\u8bd1\u5668\u5de5\u5177\u751f\u6210&#xff08;Yacc\/ANTLR&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u6027\u80fd<\/td>\n<td>\u9ad8&#xff08;\u53ef\u4f18\u5316&#xff09;<\/td>\n<td>\u4e2d\u7b49<\/td>\n<\/tr>\n<tr>\n<td>\u5f00\u53d1\u901f\u5ea6<\/td>\n<td>\u6162<\/td>\n<td>\u5feb<\/td>\n<\/tr>\n<tr>\n<td>\u8c03\u8bd5\u96be\u5ea6<\/td>\n<td>\u9ad8&#xff08;\u9700\u7406\u89e3\u72b6\u6001\u673a&#xff09;<\/td>\n<td>\u4e2d\u7b49&#xff08;\u8bed\u6cd5\u51b2\u7a81\u96be\u8c03&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u7075\u6d3b\u6027<\/td>\n<td>\u6781\u9ad8&#xff08;\u53ef\u5d4c\u5165\u8bed\u4e49&#xff09;<\/td>\n<td>\u6709\u9650<\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/td>\n<td>\u6559\u5b66\u3001DSL\u3001\u6781\u81f4\u4f18\u5316<\/td>\n<td>\u901a\u7528\u8bed\u8a00\u3001\u5feb\u901f\u539f\u578b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<p>\u7ed3\u8bba&#xff1a;\u624b\u5199\u7f16\u8bd1\u5668\u662f\u7cfb\u7edf\u7f16\u7a0b\u7684\u201c\u9ed1\u5e26\u201d\u6280\u80fd\u3002\u5b83\u8981\u6c42\u5bf9\u5f62\u5f0f\u8bed\u8a00\u3001\u81ea\u52a8\u673a\u3001\u6570\u636e\u6d41\u5206\u6790\u3001\u76ee\u6807\u67b6\u6784\u6709\u6df1\u523b\u7406\u89e3\u3002<\/p>\n<p>\u5efa\u8bae\u8def\u5f84&#xff1a;\u4ece\u5b9e\u73b0\u4e00\u4e2a\u652f\u6301 int\u3001&#043; &#8211; * \/\u3001if\u3001while\u3001\u51fd\u6570\u8c03\u7528\u7684\u5b50\u96c6\u8bed\u8a00\u7f16\u8bd1\u5668\u5f00\u59cb&#xff0c;\u76ee\u6807\u8f93\u51fa x86-64 \u6c47\u7f16&#xff0c;\u9010\u6b65\u52a0\u5165\u7c7b\u578b\u7cfb\u7edf\u3001\u4f18\u5316\u4e0e\u9519\u8bef\u6062\u590d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb489\u6b21\uff0c\u70b9\u8d5e7\u6b21\uff0c\u6536\u85cf7\u6b21\u3002\u672c\u6587\u6df1\u5ea6\u89e3\u6790\u624b\u5199\u7f16\u8bd1\u5668\u6280\u672f\uff0c\u6db5\u76d6\u8bcd\u6cd5\/\u8bed\u6cd5\u5206\u6790\u3001AST\u3001\u8bed\u4e49\u5206\u6790\u3001IR\u3001\u4ee3\u7801\u751f\u6210\u4e0e\u4f18\u5316\uff0c\u805a\u7126\u5b9e\u73b0\u7ec6\u8282\u4e0e\u5de5\u7a0b\u6311\u6218\uff0c\u63ed\u793a\u5176\u5728\u7cfb\u7edf\u7f16\u7a0b\u4e2d\u7684\u6838\u5fc3\u4ef7\u503c\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,190,1917,427,5531],"topic":[],"class_list":["post-54359","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-190","tag-1917","tag-427","tag-5531"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u624b\u5199\u7f16\u8bd1\u5668\uff1a\u4ece\u8bcd\u6cd5\u5230\u4ee3\u7801\u751f\u6210\u7684\u6280\u672f\u6df1\u5ea6\u89e3\u6790 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/54359.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u624b\u5199\u7f16\u8bd1\u5668\uff1a\u4ece\u8bcd\u6cd5\u5230\u4ee3\u7801\u751f\u6210\u7684\u6280\u672f\u6df1\u5ea6\u89e3\u6790 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" 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