prosody
4d5549de27e6
util-src/table.c

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util-src/table.c @ 12777:4d5549de27e6

util.jsonpointer: Improve tests Result of mutation testing Remaining mutants are mostly relating to the math.type() fallback. Another case being that array[#array+1] == array[#array+2] and thus doesn't matter.
author Kim Alvefur <zash@zash.se>
date Wed, 19 Oct 2022 14:21:13 +0200
parent 12591:494577d883ff
child 12976:a187600ec7d6
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7c4cf87f4dff util.table, Makefile: New C module that allows pre-allocation of tables to improve performance and decrease memory fragmentation
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1 #include <lua.h>
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2 #include <lauxlib.h>
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3
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4 #ifndef LUA_MAXINTEGER
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5 #include <stdint.h>
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6 #define LUA_MAXINTEGER PTRDIFF_MAX
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7 #endif
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8
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9 static int Lcreate_table(lua_State *L) {
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10 lua_createtable(L, luaL_checkinteger(L, 1), luaL_checkinteger(L, 2));
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11 return 1;
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12 }
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13
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14 /* COMPAT: w/ Lua pre-5.2 */
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15 static int Lpack(lua_State *L) {
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16 unsigned int n_args = lua_gettop(L);
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17 lua_createtable(L, n_args, 1);
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18 lua_insert(L, 1);
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19
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20 for(int arg = n_args; arg >= 1; arg--) {
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21 lua_rawseti(L, 1, arg);
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22 }
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23
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24 lua_pushinteger(L, n_args);
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25 lua_setfield(L, -2, "n");
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26 return 1;
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27 }
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28
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29 /* COMPAT: w/ Lua pre-5.4 */
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30 static int Lmove (lua_State *L) {
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31 lua_Integer f = luaL_checkinteger(L, 2);
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32 lua_Integer e = luaL_checkinteger(L, 3);
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33 lua_Integer t = luaL_checkinteger(L, 4);
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34
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35 int tt = !lua_isnoneornil(L, 5) ? 5 : 1; /* destination table */
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36 luaL_checktype(L, 1, LUA_TTABLE);
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37 luaL_checktype(L, tt, LUA_TTABLE);
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38
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39 if (e >= f) { /* otherwise, nothing to move */
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40 lua_Integer n, i;
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41 luaL_argcheck(L, f > 0 || e < LUA_MAXINTEGER + f, 3,
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42 "too many elements to move");
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43 n = e - f + 1; /* number of elements to move */
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44 luaL_argcheck(L, t <= LUA_MAXINTEGER - n + 1, 4,
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45 "destination wrap around");
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46 if (t > e || t <= f || (tt != 1 && !lua_compare(L, 1, tt, LUA_OPEQ))) {
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47 for (i = 0; i < n; i++) {
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48 lua_rawgeti(L, 1, f + i);
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49 lua_rawseti(L, tt, t + i);
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50 }
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51 } else {
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52 for (i = n - 1; i >= 0; i--) {
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53 lua_rawgeti(L, 1, f + i);
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54 lua_rawseti(L, tt, t + i);
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55 }
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56 }
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57 }
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58
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59 lua_pushvalue(L, tt); /* return destination table */
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60 return 1;
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61 }
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62
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63 int luaopen_util_table(lua_State *L) {
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64 luaL_checkversion(L);
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65 lua_createtable(L, 0, 2);
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66 lua_pushcfunction(L, Lcreate_table);
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67 lua_setfield(L, -2, "create");
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68 lua_pushcfunction(L, Lpack);
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69 lua_setfield(L, -2, "pack");
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70 lua_pushcfunction(L, Lmove);
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71 lua_setfield(L, -2, "move");
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72 return 1;
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73 }