{"id":504,"date":"2022-01-01T21:22:21","date_gmt":"2022-01-01T13:22:21","guid":{"rendered":"https:\/\/www.ccagml.com\/?p=504"},"modified":"2022-07-06T10:23:01","modified_gmt":"2022-07-06T02:23:01","slug":"lua%e4%bb%8emain%e5%bc%80%e5%a7%8b2%e4%b9%8btable%e6%93%8d%e4%bd%9cinsert%e5%92%8c%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/www.ccagml.com\/?p=504","title":{"rendered":"lua\u4ecemain\u5f00\u59cb2\u4e4btable\u64cd\u4f5cinsert\u548c#\u533a\u522b"},"content":{"rendered":"<h1>1.\u5728table\u4e2d\u7684\u672b\u5c3e\u63d2\u5165\u4e00\u4e2a\u503c\u6709\u4e24\u79cd\u65b9\u5f0f,\u6211\u4eec\u6765\u770b\u6709\u4ec0\u4e48\u4e0d\u540c<\/h1>\n<pre><code class=\"line-numbers\">a = {}\ntable.insert(a, 1)\na[#a + 1] = 1\n\n<\/code><\/pre>\n<h1>2.\u5c06\u4ee3\u7801\u89e3\u6790\u6210token<\/h1>\n<pre><code class=\"line-numbers\">285(TK_NAME) -&gt; 61(=) -&gt; 123({) -&gt; 125(})\n285(TK_NAME) -&gt; 46(.) -&gt; 285(TK_NAME) -&gt; 40(() -&gt; 285(TK_NAME) -&gt; 44(,) -&gt;284(TK_NUMBER)  -&gt; 41())\n285(TK_NAME) -&gt; 91([) -&gt; 35(#)-&gt; 285(TK_NAME)-&gt; 43(+)-&gt; 284(TK_NUMBER)-&gt; 93(])-&gt; 61(=)-&gt; 284(TK_NUMBER)\n<\/code><\/pre>\n<h1>3.\u5b9e\u9645\u6267\u884c\u7684\u6307\u4ee4<\/h1>\n<pre><code class=\"line-numbers\">OP_NEWTABLE\nOP_SETGLOBAL\n\nOP_GETGLOBAL\nOP_GETTABLE\nOP_GETGLOBAL\nOP_LOADK\nOP_CALL\n\nOP_GETGLOBAL\nOP_GETGLOBAL\nOP_LEN\nOP_ADD\nOP_SETTABLE\n\nOP_RETURN\n\n<\/code><\/pre>\n<h1>4.\u6307\u4ee4\u5206\u6790<\/h1>\n<p>\u6307\u4ee4\u5206\u56db\u90e8\u5206\u770b:<br \/>\n\u7b2c\u4e00\u90e8\u5206OP_NEWTABLE\u3001OP_SETGLOBAL \u6267\u884c\u4e86 a = {}\u7684\u64cd\u4f5c<br \/>\n\u7b2c\u4e8c\u90e8\u5206 OP_GETGLOBAL\u3001OP_GETTABLE\u3001OP_GETGLOBAL\u3001OP_LOADK\u3001OP_CALL \u6267\u884c\u4e86 table.insert(a, 1)\u7684\u64cd\u4f5c<\/p>\n<pre><code class=\"line-numbers\">        case OP_GETGLOBAL:\n        {\n            TValue g;\n            TValue *rb = KBx(i); \/\/ \u53d6\u51fa\u503c \"table\"  (char *)(&amp;(rb)-&gt;value.gc-&gt;ts + 1)\n            sethvalue(L, &amp;g, cl-&gt;env);\n            gafq_assert(ttisstring(rb));\n            Protect(gafqV_gettable(L, &amp;g, rb, ra)); \/\/ \u53d6\u51fa g(\u662f\u4e00\u4e2atable) \u4e2drb\u7684\u503c key \u4e3a \"table\"\u5f97\u5185\u5bb9 \u653e\u5165 ra\u5bc4\u5b58\u5668\u4e2d\n            continue;\n        }\n        case OP_GETTABLE:\n        {\n            Protect(gafqV_gettable(L, RB(i), RKC(i), ra));  \/\/ \u4e0a\u4e00\u6b65\u6211\u4eec\u53d6\u51fa\u7684table, \u8fd9\u65f6\u5019\u7684RB(i) \u5c31\u662f\u4e0a\u4e2a\u6307\u4ee4\u5b58\u53d6ra\u7684\u503c,\n                                                            \/\/ \u8fd9\u65f6\u5019 \u6211\u4eec\u4eceRKC(i)\u7684\u503c\u4e3ainsert, \u90a3\u4e48\u8fd9\u91cc\u5c31\u662f \u5bb9table\u4e2d\u53d6\u51fainsert \u653e\u5165ra\u5bc4\u5b58\u5668\u4e2d\n            continue;\n        }\n        case OP_GETGLOBAL:\n        {\n            TValue g;\n            TValue *rb = KBx(i); \/\/ \u53d6\u51fa\u503c \"a\"  (char *)(&amp;(rb)-&gt;value.gc-&gt;ts + 1)\n            sethvalue(L, &amp;g, cl-&gt;env);\n            gafq_assert(ttisstring(rb));\n            Protect(gafqV_gettable(L, &amp;g, rb, ra)); \/\/ \u4eceg\u4e2d\u53d6\u51fa\u503c\u662fa\u7684\u6570\u636e\u653e\u5165ra\u4e2d\n            continue;\n        }\n        case OP_LOADK:\n        {\n            setobj2s(L, ra, KBx(i)); \/\/ \u4ece\u5e38\u91cf\u4e2dKBx(i) \u53d6\u51fa\u6570\u503c 1 \u653e\u5165ra\u4e2d\n            continue;\n        }\n        case OP_CALL:\n        {\n            \/\/\u51fd\u6570\u8c03\u7528\n            int b = GETARG_B(i);\n            int nresults = GETARG_C(i) - 1;\n            if (b != 0)\n                L-&gt;top = ra + b;\n            L-&gt;savedpc = pc;\n            switch (gafqD_precall(L, ra, nresults))\n            {\n            case PCRC:\n            {\n                if (nresults &gt;= 0)\n                    L-&gt;top = L-&gt;ci-&gt;top;\n                base = L-&gt;base;\n                continue;\n            }\n            default:\n            {\n                return; \/* yield *\/\n            }\n            }\n        }\n        \/\/ \u6267\u884cgtablib.c\u4e2d\u7684tinsert\u65b9\u6cd5\n\n        static int tinsert(gafq_State *L)\n        {\n            int e = aux_getn(L, 1) + 1; \/* first empty element *\/\n            int pos;                    \/* where to insert new element *\/\n            switch (gafq_gettop(L))\n            {\n            case 2:\n            {            \n                pos = e;\n                break;\n            }\n            }\n            gafqL_setn(L, 1, e);     \/* new size *\/\n            gafq_rawseti(L, 1, pos); \/* t[pos] = v *\/\n            return 0;\n        }\n        GAFQ_API void gafq_rawseti(gafq_State *L, int idx, int n)\n        {\n            '''\n            setobj2t(L, gafqH_setnum(L, hvalue(o), n), L-&gt;top - 1);\n            '''\n        }\n        \/\/ table\u83b7\u53d6\u503c\n        TValue *gafqH_setnum(gafq_State *L, Table *t, int key)\n        {\n                TValue k;\n                setnvalue(&amp;k, cast_num(key));\n                return newkey(L, t, &amp;k);\n        }\n\n<\/code><\/pre>\n<p>\u7b2c\u4e09\u90e8\u5206 OP_GETGLOBAL\u3001OP_GETGLOBAL\u3001OP_LEN\u3001OP_ADD\u3001OP_SETTABLE \u6267\u884c\u4e86 a[#a + 1] = 1 \u7684\u64cd\u4f5c<\/p>\n<pre><code class=\"line-numbers\">        case OP_GETGLOBAL:\n        {\n            \/\/\u83b7\u53d6\u5168\u5c40\n            TValue g;\n            TValue *rb = KBx(i); \/\/ \u53d6\u51fa\u503ca\n            sethvalue(L, &amp;g, cl-&gt;env);\n            gafq_assert(ttisstring(rb));\n            Protect(gafqV_gettable(L, &amp;g, rb, ra)); \/\/ \u628ag\u4e2d\u7684a\u7684\u8868 \u653e\u5165\u5bc4\u5b58\u5668ra\u4e2d\n            continue;\n        }\n        case OP_GETGLOBAL:\n        {\n            \/\/\u83b7\u53d6\u5168\u5c40\n            TValue g;\n            TValue *rb = KBx(i); \/\/ \u53d6\u51fa\u503ca \u4e5f\u5c31\u662f a[#a + 1] = 2 \u4e2d\u7684\u7b2c\u4e8c\u4e2aa\n            sethvalue(L, &amp;g, cl-&gt;env);\n            gafq_assert(ttisstring(rb));\n            Protect(gafqV_gettable(L, &amp;g, rb, ra)); \/\/ \u628ag\u4e2d\u7684a\u7684\u8868 \u653e\u5165\u5bc4\u5b58\u5668ra\u4e2d\n            continue;\n        }\n        case OP_LEN:\n        {\n            \/\/ \u83b7\u53d6\u957f\u5ea6\n            const TValue *rb = RB(i);\n            switch (ttype(rb))\n            {\n            case GAFQ_TTABLE:\n            {\n                setnvalue(ra, cast_num(gafqH_getn(hvalue(rb)))); \/\/ \u8fd9\u91cc\u5927\u6982\u662f\u4e00\u4e2a\u4e8c\u5206\u53d6\u957f\u5ea6 \u4e0e\u7b2c\u4e8c\u90e8\u5206\u4e2d\u7684aux_getn\u662f\u4e00\u6837\u7684\n                break;\n            }\n            }\n            continue;\n        }\n        case OP_ADD:\n        {\n            arith_op(gafqi_numadd, TM_ADD);\n            continue;\n        }\n        case OP_SETTABLE:\n        {\n            Protect(gafqV_settable(L, ra, RKB(i), RKC(i))); \/\/ \u8bbe\u7f6e\u503c\n            continue;\n        }\n        void gafqV_settable(gafq_State *L, const TValue *t, TValue *key, StkId val)\n        {\n\n            TValue *oldval = gafqH_set(L, h, key); \/* do a primitive set *\/\n\n        }\n\n        TValue *gafqH_set(gafq_State *L, Table *t, const TValue *key)\n        {\n            return newkey(L, t, key);\n        }\n<\/code><\/pre>\n<p>\u7b2c\u56db\u90e8\u5206 OP_RETURN \u8fd4\u56de\u7ed3\u679c<\/p>\n<h1>5. \u7ed3\u8bba<\/h1>\n<pre><code>\u4ece4\u7684\u5206\u6790\u770b\u6765,\u4e24\u8005\u7684\u5dee\u522b \u662f\u6700\u540e\u521b\u5efanewkey\u7684\u65f6\u5019\u7684key\u662f\u600e\u4e48\u5f97\u6765\u7684\ntable.insert(a, 1) \u4e2d \u662f\u8c03\u7528\u4e86gtablib.c\u4e2d\u7684tinsert\u7684c\u51fd\u6570\u7b97\u6765\u7684\na[#a + 1] = 1\u5219\u662f\u4f7f\u7528OP_ADD\u8ba1\u7b97\u5f97\u6765\u7684, \u4e24\u8005\u5728\u8ba1\u7b97\u5f53\u524da\u7684\u957f\u5ea6 \u662f\u4f7f\u7528\u4e86\u76f8\u540c\u7684\u65b9\u6cd5\n\u524d\u8005\u53ea\u7528c\u51fd\u6570 \u8ba1\u7b97 \u957f\u5ea6 \u8bbe\u7f6e newkey\n\u540e\u8005 \u5219\u4f7f\u7528\u4e24\u4e2a\u6307\u4ee4 OP_ADD\u3001OP_SETTABLE \u5b8c\u6210\u76f8\u540c\u7684\u64cd\u4f5c\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1.\u5728table\u4e2d\u7684\u672b\u5c3e\u63d2\u5165\u4e00\u4e2a\u503c\u6709\u4e24\u79cd\u65b9\u5f0f,\u6211\u4eec\u6765\u770b\u6709\u4ec0\u4e48\u4e0d\u540c a = {} table.insert(a,<a href=\"https:\/\/www.ccagml.com\/?p=504\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">lua\u4ecemain\u5f00\u59cb2\u4e4btable\u64cd\u4f5cinsert\u548c#\u533a\u522b<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[32],"tags":[],"_links":{"self":[{"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/posts\/504"}],"collection":[{"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=504"}],"version-history":[{"count":1,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/posts\/504\/revisions"}],"predecessor-version":[{"id":505,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/posts\/504\/revisions\/505"}],"wp:attachment":[{"href":"https:\/\/www.ccagml.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}