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new API for weak mode

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This commit is contained in:
Roberto Ierusalimschy 2002-08-06 14:06:56 -03:00
parent a2fa48a570
commit 634344d61f
9 changed files with 88 additions and 65 deletions
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27
lapi.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 1.206 2002/08/05 14:43:38 roberto Exp roberto $
** $Id: lapi.c,v 1.207 2002/08/06 15:32:22 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -464,6 +464,20 @@ LUA_API void lua_newtable (lua_State *L) {
}
LUA_API const char *lua_getmode (lua_State *L, int index) {
static const char *const modes[] = {"", "k", "v", "kv"};
int mode = 0;
TObject *t;
lua_lock(L);
t = luaA_index(L, index);
api_check(L, ttistable(t));
if (hvalue(t)->mode & WEAKKEY) mode += 1;
if (hvalue(t)->mode & WEAKVALUE) mode += 2;
lua_unlock(L);
return modes[mode];
}
LUA_API int lua_getmetatable (lua_State *L, int objindex) {
StkId obj;
Table *mt;
@ -555,6 +569,17 @@ LUA_API void lua_rawseti (lua_State *L, int index, int n) {
}
LUA_API void lua_setmode (lua_State *L, int index, const char *mode) {
TObject *t;
lua_lock(L);
t = luaA_index(L, index);
api_check(L, ttistable(t));
hvalue(t)->mode &= ~(WEAKKEY | WEAKVALUE); /* clear bits */
if (strchr(mode, 'k')) hvalue(t)->mode |= WEAKKEY;
if (strchr(mode, 'v')) hvalue(t)->mode |= WEAKVALUE;
lua_unlock(L);
}
LUA_API int lua_setmetatable (lua_State *L, int objindex) {
TObject *obj, *mt;
int res = 1;

25
lbaselib.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lbaselib.c,v 1.92 2002/08/05 14:46:02 roberto Exp roberto $
** $Id: lbaselib.c,v 1.93 2002/08/06 15:32:22 roberto Exp roberto $
** Basic library
** See Copyright Notice in lua.h
*/
@ -81,6 +81,21 @@ static int luaB_error (lua_State *L) {
}
static int luaB_getmode (lua_State *L) {
luaL_check_type(L, 1, LUA_TTABLE);
lua_pushstring(L, lua_getmode(L, 1));
return 1;
}
static int luaB_setmode (lua_State *L) {
luaL_check_type(L, 1, LUA_TTABLE);
lua_setmode(L, 1, luaL_check_string(L, 2));
lua_settop(L, 1);
return 1;
}
static int luaB_getmetatable (lua_State *L) {
luaL_check_any(L, 1);
if (!lua_getmetatable(L, 1)) {
@ -460,6 +475,8 @@ static const luaL_reg base_funcs[] = {
{"setmetatable", luaB_setmetatable},
{"getglobals", luaB_getglobals},
{"setglobals", luaB_setglobals},
{"getmode", luaB_getmode},
{"setmode", luaB_setmode},
{"next", luaB_next},
{"ipairs", luaB_ipairs},
{"pairs", luaB_pairs},
@ -572,11 +589,7 @@ static void base_open (lua_State *L) {
/* `newproxy' needs a weaktable as upvalue */
lua_pushliteral(L, "newproxy");
lua_newtable(L); /* new table `w' */
lua_pushvalue(L, -1); /* `w' will be its own metatable */
lua_setmetatable(L, -2);
lua_pushliteral(L, "__mode");
lua_pushliteral(L, "k");
lua_rawset(L, -3); /* metatable(w).__mode = "k" */
lua_setmode(L, -1, "k");
lua_pushcclosure(L, luaB_newproxy, 1);
lua_rawset(L, -3); /* set global `newproxy' */
lua_rawset(L, -1); /* set global _G */

63
lgc.c
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@ -1,5 +1,5 @@
/*
** $Id: lgc.c,v 1.143 2002/07/17 16:25:13 roberto Exp $
** $Id: lgc.c,v 1.144 2002/08/05 14:50:39 roberto Exp roberto $
** Garbage Collector
** See Copyright Notice in lua.h
*/
@ -35,12 +35,6 @@ typedef struct GCState {
#define ismarked(x) ((x)->mark != (x))
/* `Table.flag' bits to indicate whether table is key-weak and/or value-weak */
#define KEYWEAKBIT (TM_MODE+1) /* ORDER TM */
#define VALUEWEAKBIT (TM_MODE+2)
#define KEYWEAK (1<<KEYWEAKBIT)
#define VALUEWEAK (1<<VALUEWEAKBIT)
/* mark tricks for userdata */
#define isudmarked(u) (u->uv.len & 1)
@ -221,19 +215,15 @@ static void removekey (Node *n) {
static void traversetable (GCState *st, Table *h) {
int i;
const TObject *mode;
int weakkey = 0;
int weakvalue = 0;
marktable(st, h->metatable);
lua_assert(h->lsizenode || h->node == G(st->L)->dummynode);
mode = fasttm(st->L, h->metatable, TM_MODE);
if (mode && ttisstring(mode)) { /* weak table? */
if (h->mode & (WEAKKEY | WEAKVALUE)) { /* weak table? */
weakkey = h->mode & WEAKKEY;
weakvalue = h->mode & WEAKVALUE;
h->mark = st->toclear; /* must be cleared after GC, ... */
st->toclear = h; /* ...put in the appropriate list */
weakkey = (strchr(svalue(mode), 'k') != NULL);
weakvalue = (strchr(svalue(mode), 'v') != NULL);
h->flags &= ~(KEYWEAK | VALUEWEAK); /* clear bits */
h->flags |= (weakkey << KEYWEAKBIT) | (weakvalue << VALUEWEAKBIT);
st->toclear = h; /* ... so put in the appropriate list */
}
if (!weakvalue) {
i = sizearray(h);
@ -284,14 +274,14 @@ static int hasmark (const TObject *o) {
static void cleartablekeys (GCState *st) {
Table *h;
for (h = st->toclear; h; h = h->mark) {
int i;
if (!(h->flags & KEYWEAK)) continue;
lua_assert(strchr(svalue(fasttm(st->L, h->metatable, TM_MODE)), 'k'));
i = sizenode(h);
while (i--) {
Node *n = node(h, i);
if (!hasmark(key(n)))
removekey(n); /* ... and key */
lua_assert(h->mode & (WEAKKEY | WEAKVALUE));
if ((h->mode & WEAKKEY)) { /* table may have collected keys? */
int i = sizenode(h);
while (i--) {
Node *n = node(h, i);
if (!hasmark(key(n))) /* key was collected? */
removekey(n); /* remove entry from table */
}
}
}
}
@ -303,20 +293,19 @@ static void cleartablekeys (GCState *st) {
static void cleartablevalues (GCState *st) {
Table *h;
for (h = st->toclear; h; h = h->mark) {
int i;
if (!(h->flags & VALUEWEAK)) continue;
lua_assert(strchr(svalue(fasttm(st->L, h->metatable, TM_MODE)), 'v'));
i = sizearray(h);
while (i--) {
TObject *o = &h->array[i];
if (!hasmark(o))
setnilvalue(o); /* remove value */
}
i = sizenode(h);
while (i--) {
Node *n = node(h, i);
if (!hasmark(val(n)))
removekey(n); /* ... and key */
if ((h->mode & WEAKVALUE)) { /* table may have collected values? */
int i = sizearray(h);
while (i--) {
TObject *o = &h->array[i];
if (!hasmark(o)) /* value was collected? */
setnilvalue(o); /* remove value */
}
i = sizenode(h);
while (i--) {
Node *n = node(h, i);
if (!hasmark(val(n))) /* value was collected? */
removekey(n); /* remove entry from table */
}
}
}
}

6
lobject.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lobject.h,v 1.140 2002/07/17 16:25:13 roberto Exp $
** $Id: lobject.h,v 1.141 2002/08/05 14:08:02 roberto Exp roberto $
** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/
@ -223,8 +223,12 @@ typedef struct Table {
int sizearray; /* size of `array' array */
lu_byte flags; /* 1<<p means tagmethod(p) is not present */
lu_byte lsizenode; /* log2 of size of `node' array */
lu_byte mode;
} Table;
/* bit masks for `mode' */
#define WEAKKEY 1
#define WEAKVALUE 2
/*

3
ltable.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ltable.c,v 1.114 2002/07/17 16:25:13 roberto Exp $
** $Id: ltable.c,v 1.115 2002/08/05 14:45:32 roberto Exp roberto $
** Lua tables (hash)
** See Copyright Notice in lua.h
*/
@ -309,6 +309,7 @@ Table *luaH_new (lua_State *L, int narray, int lnhash) {
G(L)->roottable = t;
t->mark = t;
t->flags = cast(lu_byte, ~0);
t->mode = 0;
/* temporary values (kept only if some malloc fails) */
t->array = NULL;
t->sizearray = 0;

8
ltablib.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ltablib.c,v 1.9 2002/07/01 19:25:28 roberto Exp roberto $
** $Id: ltablib.c,v 1.10 2002/07/08 16:51:20 roberto Exp roberto $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
@ -288,11 +288,7 @@ static const luaL_reg tab_funcs[] = {
LUALIB_API int lua_tablibopen (lua_State *L) {
lua_newtable(L); /* create N (table to store num. elements in tables) */
lua_pushvalue(L, -1);
lua_setmetatable(L, -2); /* make it its own metatable */
lua_pushliteral(L, "__mode");
lua_pushliteral(L, "k");
lua_rawset(L, -3); /* make it a weak table */
lua_setmode(L, -1, "k"); /* make it a weak table */
luaL_opennamedlib(L, LUA_TABLIBNAME, tab_funcs, 1);
return 0;
}

6
ltm.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ltm.c,v 1.98 2002/07/17 16:25:13 roberto Exp $
** $Id: ltm.c,v 1.99 2002/08/05 14:09:06 roberto Exp roberto $
** Tag methods
** See Copyright Notice in lua.h
*/
@ -26,7 +26,7 @@ const char *const luaT_typenames[] = {
void luaT_init (lua_State *L) {
static const char *const luaT_eventname[] = { /* ORDER TM */
"__index", "__newindex",
"__gc", "__eq", "__mode",
"__gc", "__eq",
"__gettable", "__settable",
"__add", "__sub", "__mul", "__div",
"__pow", "__unm", "__lt", "__le",
@ -46,7 +46,7 @@ void luaT_init (lua_State *L) {
*/
const TObject *luaT_gettm (Table *events, TMS event, TString *ename) {
const TObject *tm = luaH_getstr(events, ename);
lua_assert(event <= TM_MODE);
lua_assert(event <= TM_EQ);
if (ttisnil(tm)) { /* no tag method? */
events->flags |= (1u<<event); /* cache this fact */
return NULL;

11
ltm.h
View File

@ -1,5 +1,5 @@
/*
** $Id: ltm.h,v 1.37 2002/06/25 19:17:22 roberto Exp roberto $
** $Id: ltm.h,v 1.38 2002/07/01 17:06:58 roberto Exp roberto $
** Tag methods
** See Copyright Notice in lua.h
*/
@ -11,12 +11,6 @@
#include "lobject.h"
/*
** Important: garbage collection uses two extra bits of `Table.flags'
** (after TM_MODE), so the maximum number of `fast tag methods' is six
** (at least while `flags' is a byte).
*/
/*
* WARNING: if you change the order of this enumeration,
* grep "ORDER TM"
@ -25,8 +19,7 @@ typedef enum {
TM_INDEX,
TM_NEWINDEX,
TM_GC,
TM_EQ,
TM_MODE, /* last tag method with `fast' access */
TM_EQ, /* last tag method with `fast' access */
TM_GETTABLE,
TM_SETTABLE,
TM_ADD,

4
lua.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lua.h,v 1.148 2002/08/05 14:51:47 roberto Exp roberto $
** $Id: lua.h,v 1.149 2002/08/06 15:32:22 roberto Exp roberto $
** Lua - An Extensible Extension Language
** Tecgraf: Computer Graphics Technology Group, PUC-Rio, Brazil
** http://www.lua.org mailto:info@lua.org
@ -166,6 +166,7 @@ LUA_API void lua_rawget (lua_State *L, int index);
LUA_API void lua_rawgeti (lua_State *L, int index, int n);
LUA_API void lua_newtable (lua_State *L);
LUA_API int lua_getmetatable (lua_State *L, int objindex);
LUA_API const char *lua_getmode (lua_State *L, int index);
LUA_API void lua_getglobals (lua_State *L, int level);
@ -175,6 +176,7 @@ LUA_API void lua_getglobals (lua_State *L, int level);
LUA_API void lua_settable (lua_State *L, int index);
LUA_API void lua_rawset (lua_State *L, int index);
LUA_API void lua_rawseti (lua_State *L, int index, int n);
LUA_API void lua_setmode (lua_State *L, int index, const char *mode);
LUA_API int lua_setmetatable (lua_State *L, int objindex);
LUA_API int lua_setglobals (lua_State *L, int level);