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first implementation of `for' over tables

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This commit is contained in:
Roberto Ierusalimschy 2000-05-15 16:48:04 -03:00
parent 9e1f94fc1c
commit 93d93a0bfb
5 changed files with 118 additions and 35 deletions
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14
lcode.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lcode.c,v 1.28 2000/04/19 13:41:37 roberto Exp roberto $
** $Id: lcode.c,v 1.29 2000/05/08 19:32:53 roberto Exp roberto $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
@ -475,6 +475,18 @@ int luaK_code2 (FuncState *fs, OpCode o, int arg1, int arg2) {
mode = iS;
break;
case OP_LFORPREP:
delta = 3;
arg1 = NO_JUMP;
mode = iS;
break;
case OP_LFORLOOP:
delta = -4;
arg1 = NO_JUMP;
mode = iS;
break;
case OP_END:
case OP_PUSHNILJMP:
case OP_NOT:

5
lopcodes.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lopcodes.h,v 1.59 2000/04/14 17:45:25 roberto Exp roberto $
** $Id: lopcodes.h,v 1.60 2000/04/27 17:39:15 roberto Exp roberto $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -143,6 +143,9 @@ OP_PUSHNILJMP,/* - - nil PC++; */
OP_FORPREP,/* J */
OP_FORLOOP,/* J */
OP_LFORPREP,/* J */
OP_LFORLOOP,/* J */
OP_CLOSURE,/* A B v_b-v_1 closure(KPROTO[a], v_1-v_b) */
OP_SETLINE/* U - - LINE=u */

89
lparser.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lparser.c,v 1.85 2000/05/10 16:33:20 roberto Exp roberto $
** $Id: lparser.c,v 1.86 2000/05/12 18:12:04 roberto Exp roberto $
** LL(1) Parser and code generator for Lua
** See Copyright Notice in lua.h
*/
@ -205,7 +205,8 @@ static void store_localvar (LexState *ls, TString *name, int n) {
}
static void adjustlocalvars (LexState *ls, int nvars, int line) {
static void adjustlocalvars (LexState *ls, int nvars) {
int line = ls->fs->lastsetline;
FuncState *fs = ls->fs;
int i;
fs->nlocalvar += nvars;
@ -214,7 +215,8 @@ static void adjustlocalvars (LexState *ls, int nvars, int line) {
}
static void removelocalvars (LexState *ls, int nvars, int line) {
static void removelocalvars (LexState *ls, int nvars) {
int line = ls->fs->lastsetline;
ls->fs->nlocalvar -= nvars;
while (nvars--)
luaI_unregisterlocalvar(ls, line);
@ -223,7 +225,7 @@ static void removelocalvars (LexState *ls, int nvars, int line) {
static void add_localvar (LexState *ls, const char *name) {
store_localvar(ls, luaS_newfixed(ls->L, name), 0);
adjustlocalvars(ls, 1, 0);
adjustlocalvars(ls, 1);
}
@ -303,7 +305,7 @@ static void adjust_mult_assign (LexState *ls, int nvars, int nexps) {
static void code_args (LexState *ls, int nparams, int dots) {
FuncState *fs = ls->fs;
adjustlocalvars(ls, nparams, 0);
adjustlocalvars(ls, nparams);
checklimit(ls, fs->nlocalvar, MAXPARAMS, "parameters");
nparams = fs->nlocalvar; /* `self' could be there already */
fs->f->numparams = nparams;
@ -838,7 +840,7 @@ static void block (LexState *ls) {
int nlocalvar = fs->nlocalvar;
chunk(ls);
luaK_adjuststack(fs, fs->nlocalvar - nlocalvar); /* remove local variables */
removelocalvars(ls, fs->nlocalvar - nlocalvar, fs->lastsetline);
removelocalvars(ls, fs->nlocalvar - nlocalvar);
}
@ -907,15 +909,20 @@ static void repeatstat (LexState *ls, int line) {
}
static void forstat (LexState *ls, int line) {
/* forstat -> FOR NAME '=' expr1 ',' expr1 [',' expr1] DO block END */
static void forbody (LexState *ls, OpCode prepfor, OpCode loopfor) {
FuncState *fs = ls->fs;
int prep;
int blockinit;
Breaklabel bl;
enterbreak(fs, &bl);
setline_and_next(ls); /* skip for */
store_localvar(ls, str_checkname(ls), 0); /* control variable */
int prep = luaK_code0(fs, prepfor);
int blockinit = luaK_getlabel(fs);
check(ls, TK_DO);
block(ls);
luaK_patchlist(fs, prep, luaK_getlabel(fs));
luaK_patchlist(fs, luaK_code0(fs, loopfor), blockinit);
}
static void fornum (LexState *ls, TString *varname) {
FuncState *fs = ls->fs;
store_localvar(ls, varname, 0);
check(ls, '=');
exp1(ls); /* initial value */
check(ls, ',');
@ -924,18 +931,49 @@ static void forstat (LexState *ls, int line) {
exp1(ls); /* optional step */
else
luaK_code1(fs, OP_PUSHINT, 1); /* default step */
adjustlocalvars(ls, 1, 0); /* init scope for control variable */
add_localvar(ls, " limit ");
add_localvar(ls, " step ");
prep = luaK_code0(fs, OP_FORPREP);
blockinit = luaK_getlabel(fs);
check(ls, TK_DO);
block(ls);
luaK_patchlist(fs, prep, luaK_getlabel(fs));
luaK_patchlist(fs, luaK_code0(fs, OP_FORLOOP), blockinit);
adjustlocalvars(ls, 1); /* scope for control variables */
add_localvar(ls, "*limit*");
add_localvar(ls, "*step*");
forbody(ls, OP_FORPREP, OP_FORLOOP);
removelocalvars(ls, 3);
}
static void forlist (LexState *ls, TString *indexname) {
TString *valname;
check(ls, ',');
valname = str_checkname(ls);
/* next test is dirty, but avoids `in' being a reserved word */
if (ls->token != TK_NAME || ls->seminfo.ts != luaS_new(ls->L, "in"))
luaK_error(ls, "`in' expected");
next(ls); /* skip `in' */
exp1(ls); /* table */
add_localvar(ls, "*table*");
add_localvar(ls, "*counter*");
store_localvar(ls, indexname, 0);
store_localvar(ls, valname, 1);
adjustlocalvars(ls, 2); /* scope for control variable */
forbody(ls, OP_LFORPREP, OP_LFORLOOP);
removelocalvars(ls, 4);
}
static void forstat (LexState *ls, int line) {
/* forstat -> FOR NAME '=' expr1 ',' expr1 [',' expr1] DO block END */
/* forstat -> FOR NAME1, NAME2 IN expr1 DO block END */
FuncState *fs = ls->fs;
TString *varname;
Breaklabel bl;
enterbreak(fs, &bl);
setline_and_next(ls); /* skip `for' */
varname = str_checkname(ls); /* first variable name */
switch (ls->token) {
case '=': fornum(ls, varname); break;
case ',': forlist(ls, varname); break;
default: luaK_error(ls, "`=' or `,' expected");
}
check_END(ls, TK_FOR, line);
leavebreak(fs, &bl);
removelocalvars(ls, 3, fs->lastsetline);
}
@ -999,13 +1037,12 @@ static int decinit (LexState *ls) {
static void localstat (LexState *ls) {
/* stat -> LOCAL localnamelist decinit */
FuncState *fs = ls->fs;
int nvars;
int nexps;
setline_and_next(ls); /* skip LOCAL */
nvars = localnamelist(ls);
nexps = decinit(ls);
adjustlocalvars(ls, nvars, fs->lastsetline);
adjustlocalvars(ls, nvars);
adjust_mult_assign(ls, nvars, nexps);
}

8
ltests.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ltests.c,v 1.17 2000/05/08 19:32:53 roberto Exp roberto $
** $Id: ltests.c,v 1.18 2000/05/10 16:33:20 roberto Exp roberto $
** Internal Module for Debugging of the Lua Implementation
** See Copyright Notice in lua.h
*/
@ -103,8 +103,10 @@ static int pushop (lua_State *L, Instruction i) {
case OP_JMPONF: S("JMPONF"); break;
case OP_JMP: S("JMP"); break;
case OP_PUSHNILJMP: O("PUSHNILJMP"); break;
case OP_FORPREP: S("OP_FORPREP"); break;
case OP_FORLOOP: S("OP_FORLOOP"); break;
case OP_FORPREP: S("FORPREP"); break;
case OP_FORLOOP: S("FORLOOP"); break;
case OP_LFORPREP: S("LFORPREP"); break;
case OP_LFORLOOP: S("LFORLOOP"); break;
case OP_CLOSURE: AB("CLOSURE"); break;
case OP_SETLINE: U("SETLINE"); break;
}

37
lvm.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lvm.c,v 1.104 2000/04/19 13:36:25 roberto Exp roberto $
** $Id: lvm.c,v 1.105 2000/05/08 19:32:53 roberto Exp roberto $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -11,6 +11,7 @@
#define LUA_REENTRANT
#include "lapi.h"
#include "lauxlib.h"
#include "ldebug.h"
#include "ldo.h"
@ -634,12 +635,40 @@ StkId luaV_execute (lua_State *L, const Closure *cl, StkId base) {
if (ttype(top-3) != TAG_NUMBER)
lua_error(L, "`for' index must be a number");
index = nvalue(top-3)+step;
if ((step>0) ? index<=limit : index>=limit) {
if ((step>0) ? index>limit : index<limit)
top -= 3; /* end loop: remove control variables */
else {
nvalue(top-3) = index;
pc += GETARG_S(i);
}
else /* end of `for': remove control variables */
top -= 3;
break;
}
case OP_LFORPREP: {
if (ttype(top-1) != TAG_TABLE)
lua_error(L, "`for' table must be a table");
top += 3; /* counter + index,value */
ttype(top-3) = TAG_NUMBER;
nvalue(top-3) = 0.0; /* counter */
ttype(top-2) = ttype(top-1) = TAG_NIL;
pc += GETARG_S(i);
break;
}
case OP_LFORLOOP: {
int n;
top -= 2; /* remove old index,value */
LUA_ASSERT(L, ttype(top-2) == TAG_TABLE, "invalid table");
LUA_ASSERT(L, ttype(top-1) == TAG_NUMBER, "invalid counter");
L->top = top;
n = luaA_next(L, avalue(top-2), (int)nvalue(top-1));
if (n == 0) /* end loop? */
top -= 2; /* remove table and counter */
else {
nvalue(top-1) = (Number)n;
top += 2; /* new index,value */
pc += GETARG_S(i); /* repeat loop */
}
break;
}