mirror of
https://github.com/lua/lua
synced 2024-12-05 02:41:56 +03:00
776 lines
24 KiB
C
776 lines
24 KiB
C
/*
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** $Id: lvm.c,v 1.275 2003/02/11 10:46:24 roberto Exp roberto $
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** Lua virtual machine
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** See Copyright Notice in lua.h
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*/
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#define lvm_c
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#include "lua.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lfunc.h"
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#include "lgc.h"
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#include "lobject.h"
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#include "lopcodes.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "ltable.h"
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#include "ltm.h"
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#include "lvm.h"
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/* function to convert a lua_Number to a string */
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#ifndef lua_number2str
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#include <stdio.h>
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#define lua_number2str(s,n) sprintf((s), LUA_NUMBER_FMT, (n))
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#endif
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/* limit for table tag-method chains (to avoid loops) */
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#define MAXTAGLOOP 100
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const TObject *luaV_tonumber (const TObject *obj, TObject *n) {
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lua_Number num;
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if (ttisnumber(obj)) return obj;
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if (ttisstring(obj) && luaO_str2d(svalue(obj), &num)) {
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setnvalue(n, num);
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return n;
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}
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else
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return NULL;
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}
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int luaV_tostring (lua_State *L, StkId obj) {
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if (!ttisnumber(obj))
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return 0;
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else {
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char s[32]; /* 16 digits, sign, point and \0 (+ some extra...) */
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lua_number2str(s, nvalue(obj));
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setsvalue2s(obj, luaS_new(L, s));
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return 1;
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}
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}
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static void traceexec (lua_State *L) {
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lu_byte mask = L->hookmask;
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if (mask > LUA_MASKLINE) { /* instruction-hook set? */
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if (L->hookcount == 0) {
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resethookcount(L);
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luaD_callhook(L, LUA_HOOKCOUNT, -1);
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return;
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}
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}
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if (mask & LUA_MASKLINE) {
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CallInfo *ci = L->ci;
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Proto *p = ci_func(ci)->l.p;
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int newline = getline(p, pcRel(*ci->u.l.pc, p));
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if (!L->hookinit) {
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luaG_inithooks(L);
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return;
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}
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lua_assert(ci->state & CI_HASFRAME);
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if (pcRel(*ci->u.l.pc, p) == 0) /* tracing may be starting now? */
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ci->u.l.savedpc = *ci->u.l.pc; /* initialize `savedpc' */
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/* calls linehook when enters a new line or jumps back (loop) */
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if (*ci->u.l.pc <= ci->u.l.savedpc ||
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newline != getline(p, pcRel(ci->u.l.savedpc, p))) {
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luaD_callhook(L, LUA_HOOKLINE, newline);
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ci = L->ci; /* previous call may reallocate `ci' */
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}
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ci->u.l.savedpc = *ci->u.l.pc;
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}
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}
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static void callTMres (lua_State *L, const TObject *f,
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const TObject *p1, const TObject *p2) {
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setobj2s(L->top, f); /* push function */
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setobj2s(L->top+1, p1); /* 1st argument */
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setobj2s(L->top+2, p2); /* 2nd argument */
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luaD_checkstack(L, 3); /* cannot check before (could invalidate p1, p2) */
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L->top += 3;
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luaD_call(L, L->top - 3, 1);
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L->top--; /* result will be in L->top */
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}
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static void callTM (lua_State *L, const TObject *f,
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const TObject *p1, const TObject *p2, const TObject *p3) {
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setobj2s(L->top, f); /* push function */
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setobj2s(L->top+1, p1); /* 1st argument */
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setobj2s(L->top+2, p2); /* 2nd argument */
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setobj2s(L->top+3, p3); /* 3th argument */
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luaD_checkstack(L, 4); /* cannot check before (could invalidate p1...p3) */
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L->top += 4;
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luaD_call(L, L->top - 4, 0);
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}
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static const TObject *luaV_index (lua_State *L, const TObject *t,
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TObject *key, int loop) {
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const TObject *tm = fasttm(L, hvalue(t)->metatable, TM_INDEX);
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if (tm == NULL) return &luaO_nilobject; /* no TM */
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if (ttisfunction(tm)) {
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callTMres(L, tm, t, key);
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return L->top;
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}
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else return luaV_gettable(L, tm, key, loop);
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}
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static const TObject *luaV_getnotable (lua_State *L, const TObject *t,
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TObject *key, int loop) {
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const TObject *tm = luaT_gettmbyobj(L, t, TM_INDEX);
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if (ttisnil(tm))
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luaG_typeerror(L, t, "index");
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if (ttisfunction(tm)) {
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callTMres(L, tm, t, key);
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return L->top;
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}
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else return luaV_gettable(L, tm, key, loop);
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}
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/*
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** Function to index a table.
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** Receives the table at `t' and the key at `key'.
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** leaves the result at `res'.
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*/
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const TObject *luaV_gettable (lua_State *L, const TObject *t, TObject *key,
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int loop) {
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if (loop > MAXTAGLOOP)
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luaG_runerror(L, "loop in gettable");
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if (ttistable(t)) { /* `t' is a table? */
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Table *h = hvalue(t);
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const TObject *v = luaH_get(h, key); /* do a primitive get */
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if (!ttisnil(v)) return v;
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else return luaV_index(L, t, key, loop+1);
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}
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else return luaV_getnotable(L, t, key, loop+1);
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}
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/*
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** Receives table at `t', key at `key' and value at `val'.
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*/
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void luaV_settable (lua_State *L, const TObject *t, TObject *key, StkId val) {
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const TObject *tm;
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int loop = 0;
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do {
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if (ttistable(t)) { /* `t' is a table? */
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Table *h = hvalue(t);
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TObject *oldval = luaH_set(L, h, key); /* do a primitive set */
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if (!ttisnil(oldval) || /* result is no nil? */
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(tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
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setobj2t(oldval, val); /* write barrier */
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return;
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}
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/* else will try the tag method */
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}
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else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
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luaG_typeerror(L, t, "index");
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if (ttisfunction(tm)) {
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callTM(L, tm, t, key, val);
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return;
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}
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t = tm; /* else repeat with `tm' */
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} while (++loop <= MAXTAGLOOP);
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luaG_runerror(L, "loop in settable");
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}
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static int call_binTM (lua_State *L, const TObject *p1, const TObject *p2,
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StkId res, TMS event) {
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ptrdiff_t result = savestack(L, res);
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const TObject *tm = luaT_gettmbyobj(L, p1, event); /* try first operand */
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if (ttisnil(tm))
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tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
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if (!ttisfunction(tm)) return 0;
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callTMres(L, tm, p1, p2);
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res = restorestack(L, result); /* previous call may change stack */
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setobjs2s(res, L->top);
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return 1;
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}
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static const TObject *get_compTM (lua_State *L, Table *mt1, Table *mt2,
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TMS event) {
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const TObject *tm1 = fasttm(L, mt1, event);
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const TObject *tm2;
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if (tm1 == NULL) return NULL; /* no metamethod */
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if (mt1 == mt2) return tm1; /* same metatables => same metamethods */
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tm2 = fasttm(L, mt2, event);
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if (tm2 == NULL) return NULL; /* no metamethod */
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if (luaO_rawequalObj(tm1, tm2)) /* same metamethods? */
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return tm1;
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return NULL;
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}
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static int call_orderTM (lua_State *L, const TObject *p1, const TObject *p2,
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TMS event) {
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const TObject *tm1 = luaT_gettmbyobj(L, p1, event);
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const TObject *tm2;
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if (ttisnil(tm1)) return -1; /* no metamethod? */
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tm2 = luaT_gettmbyobj(L, p2, event);
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if (!luaO_rawequalObj(tm1, tm2)) /* different metamethods? */
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return -1;
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callTMres(L, tm1, p1, p2);
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return !l_isfalse(L->top);
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}
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static int luaV_strcmp (const TString *ls, const TString *rs) {
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const char *l = getstr(ls);
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size_t ll = ls->tsv.len;
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const char *r = getstr(rs);
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size_t lr = rs->tsv.len;
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for (;;) {
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int temp = strcoll(l, r);
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if (temp != 0) return temp;
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else { /* strings are equal up to a `\0' */
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size_t len = strlen(l); /* index of first `\0' in both strings */
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if (len == lr) /* r is finished? */
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return (len == ll) ? 0 : 1;
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else if (len == ll) /* l is finished? */
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return -1; /* l is smaller than r (because r is not finished) */
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/* both strings longer than `len'; go on comparing (after the `\0') */
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len++;
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l += len; ll -= len; r += len; lr -= len;
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}
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}
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}
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int luaV_lessthan (lua_State *L, const TObject *l, const TObject *r) {
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int res;
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if (ttype(l) != ttype(r))
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return luaG_ordererror(L, l, r);
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else if (ttisnumber(l))
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return nvalue(l) < nvalue(r);
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else if (ttisstring(l))
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return luaV_strcmp(tsvalue(l), tsvalue(r)) < 0;
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else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
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return res;
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return luaG_ordererror(L, l, r);
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}
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static int luaV_lessequal (lua_State *L, const TObject *l, const TObject *r) {
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int res;
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if (ttype(l) != ttype(r))
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return luaG_ordererror(L, l, r);
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else if (ttisnumber(l))
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return nvalue(l) <= nvalue(r);
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else if (ttisstring(l))
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return luaV_strcmp(tsvalue(l), tsvalue(r)) <= 0;
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else if ((res = call_orderTM(L, l, r, TM_LE)) != -1) /* first try `le' */
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return res;
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else if ((res = call_orderTM(L, r, l, TM_LT)) != -1) /* else try `lt' */
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return !res;
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return luaG_ordererror(L, l, r);
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}
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int luaV_equalval (lua_State *L, const TObject *t1, const TObject *t2) {
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const TObject *tm = NULL;
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lua_assert(ttype(t1) == ttype(t2));
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switch (ttype(t1)) {
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case LUA_TNIL: return 1;
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case LUA_TNUMBER: return nvalue(t1) == nvalue(t2);
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case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2); /* true must be 1 !! */
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case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
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case LUA_TUSERDATA: {
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if (uvalue(t1) == uvalue(t2)) return 1;
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tm = get_compTM(L, uvalue(t1)->uv.metatable, uvalue(t2)->uv.metatable,
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TM_EQ);
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break; /* will try TM */
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}
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case LUA_TTABLE: {
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if (hvalue(t1) == hvalue(t2)) return 1;
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tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
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break; /* will try TM */
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}
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default: return gcvalue(t1) == gcvalue(t2);
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}
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if (tm == NULL) return 0; /* no TM? */
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callTMres(L, tm, t1, t2); /* call TM */
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return !l_isfalse(L->top);
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}
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void luaV_concat (lua_State *L, int total, int last) {
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do {
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StkId top = L->base + last + 1;
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int n = 2; /* number of elements handled in this pass (at least 2) */
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if (!tostring(L, top-2) || !tostring(L, top-1)) {
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if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
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luaG_concaterror(L, top-2, top-1);
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} else if (tsvalue(top-1)->tsv.len > 0) { /* if len=0, do nothing */
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/* at least two string values; get as many as possible */
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lu_mem tl = cast(lu_mem, tsvalue(top-1)->tsv.len) +
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cast(lu_mem, tsvalue(top-2)->tsv.len);
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char *buffer;
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int i;
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while (n < total && tostring(L, top-n-1)) { /* collect total length */
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tl += tsvalue(top-n-1)->tsv.len;
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n++;
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}
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if (tl > MAX_SIZET) luaG_runerror(L, "string size overflow");
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buffer = luaZ_openspace(L, &G(L)->buff, tl);
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tl = 0;
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for (i=n; i>0; i--) { /* concat all strings */
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size_t l = tsvalue(top-i)->tsv.len;
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memcpy(buffer+tl, svalue(top-i), l);
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tl += l;
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}
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setsvalue2s(top-n, luaS_newlstr(L, buffer, tl));
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}
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total -= n-1; /* got `n' strings to create 1 new */
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last -= n-1;
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} while (total > 1); /* repeat until only 1 result left */
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}
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static void Arith (lua_State *L, StkId ra,
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const TObject *rb, const TObject *rc, TMS op) {
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TObject tempb, tempc;
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const TObject *b, *c;
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if ((b = luaV_tonumber(rb, &tempb)) != NULL &&
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(c = luaV_tonumber(rc, &tempc)) != NULL) {
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switch (op) {
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case TM_ADD: setnvalue(ra, nvalue(b) + nvalue(c)); break;
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case TM_SUB: setnvalue(ra, nvalue(b) - nvalue(c)); break;
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case TM_MUL: setnvalue(ra, nvalue(b) * nvalue(c)); break;
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case TM_DIV: setnvalue(ra, nvalue(b) / nvalue(c)); break;
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case TM_POW: {
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const TObject *f = luaH_getstr(hvalue(registry(L)),
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G(L)->tmname[TM_POW]);
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ptrdiff_t res = savestack(L, ra);
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if (!ttisfunction(f))
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luaG_runerror(L, "`pow' (for `^' operator) is not a function");
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callTMres(L, f, b, c);
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ra = restorestack(L, res); /* previous call may change stack */
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setobjs2s(ra, L->top);
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break;
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}
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default: lua_assert(0); break;
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}
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}
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else if (!call_binTM(L, rb, rc, ra, op))
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luaG_aritherror(L, rb, rc);
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}
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/*
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** some macros for common tasks in `luaV_execute'
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*/
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#define runtime_check(L, c) { if (!(c)) return 0; }
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#define RA(i) (base+GETARG_A(i))
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/* to be used after possible stack reallocation */
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#define XRA(i) (L->base+GETARG_A(i))
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#define RB(i) (base+GETARG_B(i))
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#define RKB(i) ((GETARG_B(i) < MAXSTACK) ? RB(i) : k+GETARG_B(i)-MAXSTACK)
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#define RC(i) (base+GETARG_C(i))
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#define RKC(i) ((GETARG_C(i) < MAXSTACK) ? RC(i) : k+GETARG_C(i)-MAXSTACK)
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#define KBx(i) (k+GETARG_Bx(i))
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#define dojump(pc, i) ((pc) += (i))
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StkId luaV_execute (lua_State *L) {
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LClosure *cl;
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TObject *k;
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const Instruction *pc;
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callentry: /* entry point when calling new functions */
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L->ci->u.l.pc = &pc;
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if (L->hookmask & LUA_MASKCALL)
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luaD_callhook(L, LUA_HOOKCALL, -1);
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retentry: /* entry point when returning to old functions */
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lua_assert(L->ci->state == CI_SAVEDPC ||
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L->ci->state == (CI_SAVEDPC | CI_CALLING));
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L->ci->state = CI_HASFRAME; /* activate frame */
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pc = L->ci->u.l.savedpc;
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cl = &clvalue(L->base - 1)->l;
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k = cl->p->k;
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/* main loop of interpreter */
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for (;;) {
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const Instruction i = *pc++;
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StkId base, ra;
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if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
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(--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
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traceexec(L);
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if (L->ci->state & CI_YIELD) { /* did hook yield? */
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L->ci->u.l.savedpc = pc - 1;
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L->ci->state = CI_YIELD | CI_SAVEDPC;
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return NULL;
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}
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}
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/* warning!! several calls may realloc the stack and invalidate `ra' */
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base = L->base;
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ra = RA(i);
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lua_assert(L->ci->state & CI_HASFRAME);
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lua_assert(base == L->ci->base);
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lua_assert(L->top <= L->stack + L->stacksize && L->top >= base);
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lua_assert(L->top == L->ci->top ||
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GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL ||
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GET_OPCODE(i) == OP_RETURN || GET_OPCODE(i) == OP_SETLISTO);
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switch (GET_OPCODE(i)) {
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case OP_MOVE: {
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setobjs2s(ra, RB(i));
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break;
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}
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case OP_LOADK: {
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setobj2s(ra, KBx(i));
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break;
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}
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case OP_LOADBOOL: {
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setbvalue(ra, GETARG_B(i));
|
|
if (GETARG_C(i)) pc++; /* skip next instruction (if C) */
|
|
break;
|
|
}
|
|
case OP_LOADNIL: {
|
|
TObject *rb = RB(i);
|
|
do {
|
|
setnilvalue(rb--);
|
|
} while (rb >= ra);
|
|
break;
|
|
}
|
|
case OP_GETUPVAL: {
|
|
int b = GETARG_B(i);
|
|
setobj2s(ra, cl->upvals[b]->v);
|
|
break;
|
|
}
|
|
case OP_GETGLOBAL: {
|
|
TObject *rb = KBx(i);
|
|
const TObject *v;
|
|
lua_assert(ttisstring(rb) && ttistable(&cl->g));
|
|
v = luaH_getstr(hvalue(&cl->g), tsvalue(rb));
|
|
if (!ttisnil(v)) { setobj2s(ra, v); }
|
|
else
|
|
setobj2s(XRA(i), luaV_index(L, &cl->g, rb, 0));
|
|
break;
|
|
}
|
|
case OP_GETTABLE: {
|
|
StkId rb = RB(i);
|
|
TObject *rc = RKC(i);
|
|
if (ttistable(rb)) {
|
|
const TObject *v = luaH_get(hvalue(rb), rc);
|
|
if (!ttisnil(v)) { setobj2s(ra, v); }
|
|
else
|
|
setobj2s(XRA(i), luaV_index(L, rb, rc, 0));
|
|
}
|
|
else
|
|
setobj2s(XRA(i), luaV_getnotable(L, rb, rc, 0));
|
|
break;
|
|
}
|
|
case OP_SETGLOBAL: {
|
|
lua_assert(ttisstring(KBx(i)) && ttistable(&cl->g));
|
|
luaV_settable(L, &cl->g, KBx(i), ra);
|
|
break;
|
|
}
|
|
case OP_SETUPVAL: {
|
|
int b = GETARG_B(i);
|
|
setobj(cl->upvals[b]->v, ra); /* write barrier */
|
|
break;
|
|
}
|
|
case OP_SETTABLE: {
|
|
luaV_settable(L, ra, RKB(i), RKC(i));
|
|
break;
|
|
}
|
|
case OP_NEWTABLE: {
|
|
int b = GETARG_B(i);
|
|
b = fb2int(b);
|
|
sethvalue(ra, luaH_new(L, b, GETARG_C(i)));
|
|
luaC_checkGC(L);
|
|
break;
|
|
}
|
|
case OP_SELF: {
|
|
StkId rb = RB(i);
|
|
TObject *rc = RKC(i);
|
|
runtime_check(L, ttisstring(rc));
|
|
setobjs2s(ra+1, rb);
|
|
if (ttistable(rb)) {
|
|
const TObject *v = luaH_getstr(hvalue(rb), tsvalue(rc));
|
|
if (!ttisnil(v)) { setobj2s(ra, v); }
|
|
else
|
|
setobj2s(XRA(i), luaV_index(L, rb, rc, 0));
|
|
}
|
|
else
|
|
setobj2s(XRA(i), luaV_getnotable(L, rb, rc, 0));
|
|
break;
|
|
}
|
|
case OP_ADD: {
|
|
TObject *rb = RKB(i);
|
|
TObject *rc = RKC(i);
|
|
if (ttisnumber(rb) && ttisnumber(rc)) {
|
|
setnvalue(ra, nvalue(rb) + nvalue(rc));
|
|
}
|
|
else
|
|
Arith(L, ra, rb, rc, TM_ADD);
|
|
break;
|
|
}
|
|
case OP_SUB: {
|
|
TObject *rb = RKB(i);
|
|
TObject *rc = RKC(i);
|
|
if (ttisnumber(rb) && ttisnumber(rc)) {
|
|
setnvalue(ra, nvalue(rb) - nvalue(rc));
|
|
}
|
|
else
|
|
Arith(L, ra, rb, rc, TM_SUB);
|
|
break;
|
|
}
|
|
case OP_MUL: {
|
|
TObject *rb = RKB(i);
|
|
TObject *rc = RKC(i);
|
|
if (ttisnumber(rb) && ttisnumber(rc)) {
|
|
setnvalue(ra, nvalue(rb) * nvalue(rc));
|
|
}
|
|
else
|
|
Arith(L, ra, rb, rc, TM_MUL);
|
|
break;
|
|
}
|
|
case OP_DIV: {
|
|
TObject *rb = RKB(i);
|
|
TObject *rc = RKC(i);
|
|
if (ttisnumber(rb) && ttisnumber(rc)) {
|
|
setnvalue(ra, nvalue(rb) / nvalue(rc));
|
|
}
|
|
else
|
|
Arith(L, ra, rb, rc, TM_DIV);
|
|
break;
|
|
}
|
|
case OP_POW: {
|
|
Arith(L, ra, RKB(i), RKC(i), TM_POW);
|
|
break;
|
|
}
|
|
case OP_UNM: {
|
|
const TObject *rb = RB(i);
|
|
TObject temp;
|
|
if (tonumber(rb, &temp)) {
|
|
setnvalue(ra, -nvalue(rb));
|
|
}
|
|
else {
|
|
setnilvalue(&temp);
|
|
if (!call_binTM(L, RB(i), &temp, ra, TM_UNM))
|
|
luaG_aritherror(L, RB(i), &temp);
|
|
}
|
|
break;
|
|
}
|
|
case OP_NOT: {
|
|
int res = l_isfalse(RB(i)); /* next assignment may change this value */
|
|
setbvalue(ra, res);
|
|
break;
|
|
}
|
|
case OP_CONCAT: {
|
|
int b = GETARG_B(i);
|
|
int c = GETARG_C(i);
|
|
luaV_concat(L, c-b+1, c); /* may change `base' (and `ra') */
|
|
base = L->base;
|
|
setobjs2s(RA(i), base+b);
|
|
luaC_checkGC(L);
|
|
break;
|
|
}
|
|
case OP_JMP: {
|
|
dojump(pc, GETARG_sBx(i));
|
|
break;
|
|
}
|
|
case OP_EQ: {
|
|
if (equalobj(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
|
|
else dojump(pc, GETARG_sBx(*pc) + 1);
|
|
break;
|
|
}
|
|
case OP_LT: {
|
|
if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
|
|
else dojump(pc, GETARG_sBx(*pc) + 1);
|
|
break;
|
|
}
|
|
case OP_LE: {
|
|
if (luaV_lessequal(L, RKB(i), RKC(i)) != GETARG_A(i)) pc++;
|
|
else dojump(pc, GETARG_sBx(*pc) + 1);
|
|
break;
|
|
}
|
|
case OP_TEST: {
|
|
TObject *rb = RB(i);
|
|
if (l_isfalse(rb) == GETARG_C(i)) pc++;
|
|
else {
|
|
setobjs2s(ra, rb);
|
|
dojump(pc, GETARG_sBx(*pc) + 1);
|
|
}
|
|
break;
|
|
}
|
|
case OP_CALL:
|
|
case OP_TAILCALL: {
|
|
StkId firstResult;
|
|
int b = GETARG_B(i);
|
|
int nresults;
|
|
if (b != 0) L->top = ra+b; /* else previous instruction set top */
|
|
nresults = GETARG_C(i) - 1;
|
|
firstResult = luaD_precall(L, ra);
|
|
if (firstResult) {
|
|
if (firstResult > L->top) { /* yield? */
|
|
lua_assert(L->ci->state == (CI_C | CI_YIELD));
|
|
(L->ci - 1)->u.l.savedpc = pc;
|
|
(L->ci - 1)->state = CI_SAVEDPC;
|
|
return NULL;
|
|
}
|
|
/* it was a C function (`precall' called it); adjust results */
|
|
luaD_poscall(L, nresults, firstResult);
|
|
if (nresults >= 0) L->top = L->ci->top;
|
|
}
|
|
else { /* it is a Lua function */
|
|
if (GET_OPCODE(i) == OP_CALL) { /* regular call? */
|
|
(L->ci-1)->u.l.savedpc = pc; /* save `pc' to return later */
|
|
(L->ci-1)->state = (CI_SAVEDPC | CI_CALLING);
|
|
}
|
|
else { /* tail call: put new frame in place of previous one */
|
|
int aux;
|
|
base = (L->ci - 1)->base; /* `luaD_precall' may change the stack */
|
|
ra = RA(i);
|
|
if (L->openupval) luaF_close(L, base);
|
|
for (aux = 0; ra+aux < L->top; aux++) /* move frame down */
|
|
setobjs2s(base+aux-1, ra+aux);
|
|
(L->ci - 1)->top = L->top = base+aux; /* correct top */
|
|
lua_assert(L->ci->state & CI_SAVEDPC);
|
|
(L->ci - 1)->u.l.savedpc = L->ci->u.l.savedpc;
|
|
(L->ci - 1)->state = CI_SAVEDPC;
|
|
L->ci--; /* remove new frame */
|
|
L->base = L->ci->base;
|
|
}
|
|
goto callentry;
|
|
}
|
|
break;
|
|
}
|
|
case OP_RETURN: {
|
|
CallInfo *ci = L->ci - 1;
|
|
int b = GETARG_B(i);
|
|
if (b != 0) L->top = ra+b-1;
|
|
lua_assert(L->ci->state & CI_HASFRAME);
|
|
if (L->openupval) luaF_close(L, base);
|
|
L->ci->state = CI_SAVEDPC; /* deactivate current function */
|
|
L->ci->u.l.savedpc = pc;
|
|
/* previous function was running `here'? */
|
|
if (!(ci->state & CI_CALLING))
|
|
return ra; /* no: return */
|
|
else { /* yes: continue its execution (go through) */
|
|
int nresults;
|
|
lua_assert(ttisfunction(ci->base - 1));
|
|
lua_assert(ci->state & CI_SAVEDPC);
|
|
lua_assert(GET_OPCODE(*(ci->u.l.savedpc - 1)) == OP_CALL);
|
|
nresults = GETARG_C(*(ci->u.l.savedpc - 1)) - 1;
|
|
luaD_poscall(L, nresults, ra);
|
|
if (nresults >= 0) L->top = L->ci->top;
|
|
goto retentry;
|
|
}
|
|
}
|
|
case OP_FORLOOP: {
|
|
lua_Number step, index, limit;
|
|
const TObject *plimit = ra+1;
|
|
const TObject *pstep = ra+2;
|
|
if (!ttisnumber(ra))
|
|
luaG_runerror(L, "`for' initial value must be a number");
|
|
if (!tonumber(plimit, ra+1))
|
|
luaG_runerror(L, "`for' limit must be a number");
|
|
if (!tonumber(pstep, ra+2))
|
|
luaG_runerror(L, "`for' step must be a number");
|
|
step = nvalue(pstep);
|
|
index = nvalue(ra) + step; /* increment index */
|
|
limit = nvalue(plimit);
|
|
if (step > 0 ? index <= limit : index >= limit) {
|
|
dojump(pc, GETARG_sBx(i)); /* jump back */
|
|
chgnvalue(ra, index); /* update index */
|
|
}
|
|
break;
|
|
}
|
|
case OP_TFORLOOP: {
|
|
int nvar = GETARG_C(i) + 1;
|
|
StkId cb = ra + nvar + 2; /* call base */
|
|
setobjs2s(cb, ra);
|
|
setobjs2s(cb+1, ra+1);
|
|
setobjs2s(cb+2, ra+2);
|
|
L->top = cb+3; /* func. + 2 args (state and index) */
|
|
luaD_call(L, cb, nvar);
|
|
L->top = L->ci->top;
|
|
ra = XRA(i) + 2; /* final position of first result */
|
|
cb = ra + nvar;
|
|
do { /* move results to proper positions */
|
|
nvar--;
|
|
setobjs2s(ra+nvar, cb+nvar);
|
|
} while (nvar > 0);
|
|
if (ttisnil(ra)) /* break loop? */
|
|
pc++; /* skip jump (break loop) */
|
|
else
|
|
dojump(pc, GETARG_sBx(*pc) + 1); /* jump back */
|
|
break;
|
|
}
|
|
case OP_TFORPREP: { /* for compatibility only */
|
|
if (ttistable(ra)) {
|
|
setobjs2s(ra+1, ra);
|
|
setobj2s(ra, luaH_getstr(hvalue(gt(L)), luaS_new(L, "next")));
|
|
}
|
|
dojump(pc, GETARG_sBx(i));
|
|
break;
|
|
}
|
|
case OP_SETLIST:
|
|
case OP_SETLISTO: {
|
|
int bc;
|
|
int n;
|
|
Table *h;
|
|
runtime_check(L, ttistable(ra));
|
|
h = hvalue(ra);
|
|
bc = GETARG_Bx(i);
|
|
if (GET_OPCODE(i) == OP_SETLIST)
|
|
n = (bc&(LFIELDS_PER_FLUSH-1)) + 1;
|
|
else {
|
|
n = L->top - ra - 1;
|
|
L->top = L->ci->top;
|
|
}
|
|
bc &= ~(LFIELDS_PER_FLUSH-1); /* bc = bc - bc%FPF */
|
|
for (; n > 0; n--)
|
|
setobj2t(luaH_setnum(L, h, bc+n), ra+n); /* write barrier */
|
|
break;
|
|
}
|
|
case OP_CLOSE: {
|
|
luaF_close(L, ra);
|
|
break;
|
|
}
|
|
case OP_CLOSURE: {
|
|
Proto *p;
|
|
Closure *ncl;
|
|
int nup, j;
|
|
p = cl->p->p[GETARG_Bx(i)];
|
|
nup = p->nups;
|
|
ncl = luaF_newLclosure(L, nup, &cl->g);
|
|
ncl->l.p = p;
|
|
for (j=0; j<nup; j++, pc++) {
|
|
if (GET_OPCODE(*pc) == OP_GETUPVAL)
|
|
ncl->l.upvals[j] = cl->upvals[GETARG_B(*pc)];
|
|
else {
|
|
lua_assert(GET_OPCODE(*pc) == OP_MOVE);
|
|
ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));
|
|
}
|
|
}
|
|
setclvalue(ra, ncl);
|
|
luaC_checkGC(L);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|