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https://github.com/lua/lua
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better identification of types which are tags
This commit is contained in:
Roberto Ierusalimschy
parent
19c178fa14
commit
52d5e8032c
@ -1,5 +1,5 @@
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/*
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** $Id: lobject.c,v 1.1 1997/09/16 19:25:59 roberto Exp roberto $
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** $Id: lobject.c,v 1.2 1997/09/26 16:46:20 roberto Exp roberto $
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** Some generic functions over Lua objects
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** See Copyright Notice in lua.h
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*/
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@ -12,9 +12,8 @@
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char *luaO_typenames[] = { /* ORDER LUA_T */
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"userdata", "line", "cmark", "mark", "function", "function",
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"prototype", "table", "string", "number", "nil",
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NULL
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"userdata", "number", "string", "table", "function", "function",
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"nil", "prototype", "mark", "cmark", "line", NULL
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};
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25
lobject.h
25
lobject.h
@ -1,5 +1,5 @@
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/*
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** $Id: lobject.h,v 1.3 1997/09/26 16:46:20 roberto Exp roberto $
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** $Id: lobject.h,v 1.4 1997/10/16 10:59:34 roberto Exp roberto $
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** Type definitions for Lua objects
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** See Copyright Notice in lua.h
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*/
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@ -35,20 +35,21 @@ typedef unsigned int IntPoint; /* unsigned with same size as a pointer (for hash
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** grep "ORDER LUA_T"
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*/
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typedef enum {
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LUA_T_NIL = -10,
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LUA_T_NUMBER = -9,
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LUA_T_STRING = -8,
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LUA_T_ARRAY = -7, /* array==table */
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LUA_T_PROTO = -6,
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LUA_T_FUNCTION = -5,
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LUA_T_CFUNCTION= -4,
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LUA_T_MARK = -3,
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LUA_T_CMARK = -2,
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LUA_T_LINE = -1,
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LUA_T_USERDATA = 0
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LUA_T_USERDATA = 0, /* tag default for userdata */
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LUA_T_NUMBER = -1, /* fixed tag for numbers */
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LUA_T_STRING = -2, /* fixed tag for strings */
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LUA_T_ARRAY = -3, /* tag default for tables (or arrays) */
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LUA_T_FUNCTION = -4, /* fixed tag for functions */
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LUA_T_CFUNCTION= -5, /* fixed tag for Cfunctions */
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LUA_T_NIL = -6, /* last "pre-defined" tag */
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LUA_T_PROTO = -7,
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LUA_T_MARK = -8,
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LUA_T_CMARK = -9,
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LUA_T_LINE = -10
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} lua_Type;
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#define NUM_TYPES 11
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#define NUM_TAGS 7
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typedef union {
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59
ltm.c
59
ltm.c
@ -1,5 +1,5 @@
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/*
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** $Id: ltm.c,v 1.1 1997/09/16 19:25:59 roberto Exp roberto $
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** $Id: ltm.c,v 1.2 1997/09/26 15:02:26 roberto Exp roberto $
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** Tag methods
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** See Copyright Notice in lua.h
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*/
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@ -14,31 +14,7 @@
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#include "lobject.h"
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#include "ltm.h"
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static struct IM init_IM[NUM_TYPES] = {
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{{{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}}},
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{{{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}}},
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{{{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}}},
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{{{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}}},
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static struct IM init_IM[NUM_TAGS] = {
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{{{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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{LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}}, {LUA_T_NIL, {NULL}},
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@ -89,8 +65,7 @@ static struct IM init_IM[NUM_TYPES] = {
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char *luaT_eventname[] = { /* ORDER IM */
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"gettable", "settable", "index", "getglobal", "setglobal", "add",
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"sub", "mul", "div", "pow", "unm", "lt", "le", "gt", "ge",
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"concat", "gc", "function",
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NULL
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"concat", "gc", "function", NULL
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};
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@ -105,26 +80,22 @@ static int luaI_checkevent (char *name, char *list[])
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struct IM *luaT_IMtable = init_IM;
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static int IMtable_size = NUM_TYPES;
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static int IMtable_size = NUM_TAGS;
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static int last_tag = -(NUM_TYPES-1);
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static int last_tag = -(NUM_TAGS-1);
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/* events in LUA_T_LINE are all allowed, since this is used as a
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/* events in LUA_T_NIL are all allowed, since this is used as a
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* 'placeholder' for "default" fallbacks
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*/
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static char validevents[NUM_TYPES][IM_N] = { /* ORDER LUA_T, ORDER IM */
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static char validevents[NUM_TAGS][IM_N] = { /* ORDER LUA_T, ORDER IM */
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{1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_T_USERDATA */
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{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_T_LINE */
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, /* LUA_T_CMARK */
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, /* LUA_T_MARK */
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{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}, /* LUA_T_CFUNCTION */
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{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}, /* LUA_T_FUNCTION */
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, /* LUA_T_PROTO */
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{0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_T_ARRAY */
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{1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_STRING */
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{1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_NUMBER */
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{1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} /* LUA_T_NIL */
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{1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_STRING */
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{0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_T_ARRAY */
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{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}, /* LUA_T_FUNCTION */
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{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0}, /* LUA_T_CFUNCTION */
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{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} /* LUA_T_NIL */
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};
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static int validevent (lua_Type t, int e)
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@ -159,7 +130,7 @@ int lua_newtag (void)
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static void checktag (int tag)
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{ /* ORDER LUA_T */
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{
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if (!(last_tag <= tag && tag <= 0))
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luaL_verror("%d is not a valid tag", tag);
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}
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@ -289,7 +260,7 @@ void luaT_setfallback (void)
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}
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case 3: { /* old order fallback */
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int i;
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oldfunc = *luaT_getim(LUA_T_LINE, IM_LT);
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oldfunc = *luaT_getim(LUA_T_NIL, IM_LT);
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for (i=IM_LT; i<=IM_GE; i++) /* ORDER IM */
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fillvalids(i, luaA_Address(func));
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replace = typeFB;
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@ -298,7 +269,7 @@ void luaT_setfallback (void)
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default: {
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int e;
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if ((e = luaO_findstring(name, luaT_eventname)) >= 0) {
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oldfunc = *luaT_getim(LUA_T_LINE, e);
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oldfunc = *luaT_getim(LUA_T_NIL, e);
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fillvalids(e, luaA_Address(func));
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replace = (e == IM_GC || e == IM_INDEX) ? nilFB : typeFB;
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}
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