new way to call functions, plus several small changes. This is

a temporary version!
This commit is contained in:
Roberto Ierusalimschy
1994-11-02 18:30:53 -02:00
parent ae77864844
commit fbf887ec2b
4 changed files with 779 additions and 783 deletions

190
lua.stx
View File

@@ -1,6 +1,6 @@
%{
char *rcs_luastx = "$Id: lua.stx,v 2.11 1994/10/21 19:00:12 roberto Exp roberto $";
char *rcs_luastx = "$Id: lua.stx,v 2.12 1994/11/01 18:25:20 roberto Exp roberto $";
#include <stdio.h>
#include <stdlib.h>
@@ -37,7 +37,6 @@ static int nlocalvar=0; /* number of local variables */
#define MAXFIELDS FIELDS_PER_FLUSH*2
static Word fields[MAXFIELDS]; /* fieldnames to be flushed */
static int nfields=0;
static int ntemp; /* number of temporary var into stack */
static int err; /* flag to indicate error */
/* Internal functions */
@@ -112,7 +111,6 @@ static void flush_record (int n)
code_byte(n);
for (i=0; i<n; i++)
code_word(fields[--nfields]);
ntemp -= n;
}
static void flush_list (int m, int n)
@@ -132,27 +130,15 @@ static void flush_list (int m, int n)
err = 1;
}
code_byte(n);
ntemp-=n;
}
static void incr_ntemp (void)
{
if (ntemp+nlocalvar+MAXVAR+1 < STACKGAP)
ntemp++;
else
{
lua_error ("stack overflow");
err = 1;
}
}
static void add_nlocalvar (int n)
{
if (ntemp+nlocalvar+MAXVAR+n < STACKGAP)
if (MAX_TEMPS+nlocalvar+MAXVAR+n < STACKGAP)
nlocalvar += n;
else
{
lua_error ("too many local variables or expression too complicate");
lua_error ("too many local variables");
err = 1;
}
}
@@ -190,7 +176,6 @@ static void code_number (float f)
code_byte(PUSHFLOAT);
code_float(f);
}
incr_ntemp();
}
static void init_function (void)
@@ -235,8 +220,8 @@ static void init_function (void)
%token <vInt> DEBUG
%type <vLong> PrepJump
%type <vInt> expr, exprlist, exprlist1, varlist1, funcvalue
%type <vInt> fieldlist, localdeclist
%type <vInt> expr, exprlist, exprlist1, varlist1, funcParams, funcvalue
%type <vInt> fieldlist, localdeclist, decinit
%type <vInt> ffieldlist1
%type <vInt> lfieldlist1
%type <vLong> var, singlevar
@@ -290,8 +275,8 @@ function : FUNCTION NAME
END
{
if (lua_debug) code_byte(RESET);
code_byte(RETCODE); code_byte(nlocalvar);
s_tag($<vWord>3) = T_FUNCTION;
codereturn();
s_tag($<vWord>3) = LUA_T_FUNCTION;
s_bvalue($<vWord>3) = calloc (pc, sizeof(Byte));
if (s_bvalue($<vWord>3) == NULL)
{
@@ -330,7 +315,7 @@ method : FUNCTION NAME { $<vWord>$ = lua_findsymbol($2); } ':' NAME
{
Byte *b;
if (lua_debug) code_byte(RESET);
code_byte(RETCODE); code_byte(nlocalvar);
codereturn();
b = calloc (pc, sizeof(Byte));
if (b == NULL)
{
@@ -362,7 +347,6 @@ statlist : /* empty */
;
stat : {
ntemp = 0;
if (lua_debug)
{
code_byte(SETLINE); code_word(lua_linenumber);
@@ -414,16 +398,18 @@ stat1 : IF expr1 THEN PrepJump block PrepJump elsepart END
{
{
int i;
if ($3 == 0 || nvarbuffer != ntemp - $1 * 2)
lua_codeadjust ($1 * 2 + nvarbuffer);
adjust_mult_assign(nvarbuffer, $3, $1 * 2 + nvarbuffer);
for (i=nvarbuffer-1; i>=0; i--)
lua_codestore (i);
if ($1 > 1 || ($1 == 1 && varbuffer[0] != 0))
lua_codeadjust (0);
}
}
| functioncall { lua_codeadjust (0); }
| LOCAL localdeclist decinit { add_nlocalvar($2); lua_codeadjust (0); }
| functioncall { code_byte(0); }
| LOCAL localdeclist decinit
{ add_nlocalvar($2);
adjust_mult_assign($2, $3, 0);
}
;
elsepart : /* empty */
@@ -448,7 +434,7 @@ elsepart : /* empty */
}
;
block : {$<vInt>$ = nlocalvar;} statlist {ntemp = 0;} ret
block : {$<vInt>$ = nlocalvar;} statlist ret
{
if (nlocalvar != $<vInt>1)
{
@@ -462,8 +448,9 @@ ret : /* empty */
| { if (lua_debug){code_byte(SETLINE);code_word(lua_linenumber);}}
RETURN exprlist sc
{
if ($3 < 0) code_byte(MULT_RET);
if (lua_debug) code_byte(RESET);
code_byte(RETCODE); code_byte(nlocalvar);
codereturn();
}
;
@@ -474,22 +461,22 @@ PrepJump : /* empty */
code_word (0);
}
expr1 : expr { if ($1 == 0) {lua_codeadjust (ntemp+1); incr_ntemp();}}
expr1 : expr { if ($1 == 0) code_byte(1); }
;
expr : '(' expr ')' { $$ = $2; }
| expr1 EQ expr1 { code_byte(EQOP); $$ = 1; ntemp--;}
| expr1 '<' expr1 { code_byte(LTOP); $$ = 1; ntemp--;}
| expr1 '>' expr1 { code_byte(LEOP); code_byte(NOTOP); $$ = 1; ntemp--;}
| expr1 NE expr1 { code_byte(EQOP); code_byte(NOTOP); $$ = 1; ntemp--;}
| expr1 LE expr1 { code_byte(LEOP); $$ = 1; ntemp--;}
| expr1 GE expr1 { code_byte(LTOP); code_byte(NOTOP); $$ = 1; ntemp--;}
| expr1 '+' expr1 { code_byte(ADDOP); $$ = 1; ntemp--;}
| expr1 '-' expr1 { code_byte(SUBOP); $$ = 1; ntemp--;}
| expr1 '*' expr1 { code_byte(MULTOP); $$ = 1; ntemp--;}
| expr1 '/' expr1 { code_byte(DIVOP); $$ = 1; ntemp--;}
| expr1 '^' expr1 { code_byte(POWOP); $$ = 1; ntemp--;}
| expr1 CONC expr1 { code_byte(CONCOP); $$ = 1; ntemp--;}
| expr1 EQ expr1 { code_byte(EQOP); $$ = 1; }
| expr1 '<' expr1 { code_byte(LTOP); $$ = 1; }
| expr1 '>' expr1 { code_byte(LEOP); code_byte(NOTOP); $$ = 1; }
| expr1 NE expr1 { code_byte(EQOP); code_byte(NOTOP); $$ = 1; }
| expr1 LE expr1 { code_byte(LEOP); $$ = 1; }
| expr1 GE expr1 { code_byte(LTOP); code_byte(NOTOP); $$ = 1; }
| expr1 '+' expr1 { code_byte(ADDOP); $$ = 1; }
| expr1 '-' expr1 { code_byte(SUBOP); $$ = 1; }
| expr1 '*' expr1 { code_byte(MULTOP); $$ = 1; }
| expr1 '/' expr1 { code_byte(DIVOP); $$ = 1; }
| expr1 '^' expr1 { code_byte(POWOP); $$ = 1; }
| expr1 CONC expr1 { code_byte(CONCOP); $$ = 1; }
| '+' expr1 %prec UNARY { $$ = 1; }
| '-' expr1 %prec UNARY { code_byte(MINUSOP); $$ = 1;}
| table { $$ = 1; }
@@ -500,9 +487,8 @@ expr : '(' expr ')' { $$ = $2; }
code_byte(PUSHSTRING);
code_word(lua_findconstant($1));
$$ = 1;
incr_ntemp();
}
| NIL {code_byte(PUSHNIL); $$ = 1; incr_ntemp();}
| NIL {code_byte(PUSHNIL); $$ = 1; }
| functioncall
{
$$ = 0;
@@ -512,13 +498,13 @@ expr : '(' expr ')' { $$ = $2; }
}
}
| NOT expr1 { code_byte(NOTOP); $$ = 1;}
| expr1 AND PrepJump {code_byte(POP); ntemp--;} expr1
| expr1 AND PrepJump {code_byte(POP); } expr1
{
basepc[$3] = ONFJMP;
code_word_at(basepc+$3+1, pc - ($3 + sizeof(Word)+1));
$$ = 1;
}
| expr1 OR PrepJump {code_byte(POP); ntemp--;} expr1
| expr1 OR PrepJump {code_byte(POP); } expr1
{
basepc[$3] = ONTJMP;
code_word_at(basepc+$3+1, pc - ($3 + sizeof(Word)+1));
@@ -537,33 +523,35 @@ table :
}
;
functioncall : funcvalue funcParams { code_byte(CALLFUNC); ntemp = $1-1; }
functioncall : funcvalue funcParams
{ code_byte(CALLFUNC); code_byte($1+$2); }
;
funcvalue : varexp
{
$$ = ntemp; code_byte(PUSHMARK); incr_ntemp();
}
funcvalue : varexp { $$ = 0; }
| varexp ':' NAME
{
code_byte(PUSHSTRING);
code_word(lua_findconstant($3));
incr_ntemp();
$$ = ntemp-1;
code_byte(PUSHMARKMET);
incr_ntemp();
code_byte(PUSHSELF);
$$ = 1;
}
;
funcParams : '(' exprlist ')'
| table
{ if ($2<0) { code_byte(1); $$ = -$2; } else $$ = $2; }
| table { $$ = 1; }
;
exprlist : /* empty */ { $$ = 1; }
exprlist : /* empty */ { $$ = 0; }
| exprlist1 { $$ = $1; }
;
exprlist1 : expr { $$ = $1; }
| exprlist1 ',' {if (!$1){lua_codeadjust (ntemp+1); incr_ntemp();}}
expr {$$ = $4;}
exprlist1 : expr { if ($1 == 0) $$ = -1; else $$ = 1; }
| exprlist1 ',' { if ($1 < 0) code_byte(1); } expr
{
int r = $1 < 0 ? -$1 : $1;
$$ = ($4 == 0) ? -(r+1) : r+1;
}
;
parlist : /* empty */
@@ -641,7 +629,7 @@ var : singlevar { $$ = $1; }
| varexp '.' NAME
{
code_byte(PUSHSTRING);
code_word(lua_findconstant($3)); incr_ntemp();
code_word(lua_findconstant($3));
$$ = 0; /* indexed variable */
}
;
@@ -668,8 +656,8 @@ localdeclist : NAME {localvar[nlocalvar]=lua_findsymbol($1); $$ = 1;}
}
;
decinit : /* empty */
| '=' exprlist1
decinit : /* empty */ { $$ = 0; }
| '=' exprlist1 { $$ = $2; }
;
setdebug : DEBUG {lua_debug = $1;}
@@ -698,7 +686,6 @@ static void lua_pushvar (long number)
{
code_byte(PUSHGLOBAL);
code_word(number-1);
incr_ntemp();
}
else if (number < 0) /* local var */
{
@@ -709,19 +696,50 @@ static void lua_pushvar (long number)
code_byte(PUSHLOCAL);
code_byte(number);
}
incr_ntemp();
}
else
{
code_byte(PUSHINDEXED);
ntemp--;
}
}
static void lua_codeadjust (int n)
{
code_byte(ADJUST);
code_byte(n + nlocalvar);
if (n+nlocalvar == 0)
code_byte(ADJUST0);
else
{
code_byte(ADJUST);
code_byte(n+nlocalvar);
}
}
static void codereturn (void)
{
if (nlocalvar == 0)
code_byte(RETCODE0);
else
{
code_byte(RETCODE);
code_byte(nlocalvar);
}
}
static void adjust_mult_assign (int vars, int exps, int temps)
{
if (exps < 0)
{
int r = vars - (-exps-1);
if (r >= 0)
code_byte(r);
else
{
code_byte(0);
lua_codeadjust(temps);
}
}
else if (vars != exps)
lua_codeadjust(temps);
}
static void lua_codestore (int i)
@@ -775,10 +793,9 @@ int yywrap (void)
/*
** Parse LUA code and execute global statement.
** Return 0 on success or 1 on error.
** Parse LUA code and returns global statements.
*/
int lua_parse (void)
Byte *lua_parse (void)
{
Byte *init = initcode = (Byte *) calloc(CODE_BLOCK, sizeof(Byte));
maincode = 0;
@@ -786,18 +803,17 @@ int lua_parse (void)
if (init == NULL)
{
lua_error("not enough memory");
return 1;
return NULL;
}
err = 0;
if (yyparse () || (err==1)) return 1;
initcode[maincode++] = HALT;
if (yyparse () || (err==1)) return NULL;
initcode[maincode++] = RETCODE0;
init = initcode;
#if LISTING
PrintCode(init,init+maincode);
{ static void PrintCode (Byte *code, Byte *end);
PrintCode(init,init+maincode); }
#endif
if (lua_execute (init)) return 1;
free(init);
return 0;
return init;
}
@@ -876,7 +892,6 @@ static void PrintCode (Byte *code, Byte *end)
}
break;
case PUSHINDEXED: printf ("%d PUSHINDEXED\n", (p++)-code); break;
case PUSHMARK: printf ("%d PUSHMARK\n", (p++)-code); break;
case STORELOCAL0: case STORELOCAL1: case STORELOCAL2: case STORELOCAL3:
case STORELOCAL4: case STORELOCAL5: case STORELOCAL6: case STORELOCAL7:
case STORELOCAL8: case STORELOCAL9:
@@ -896,6 +911,7 @@ static void PrintCode (Byte *code, Byte *end)
printf ("%d STOREGLOBAL %d\n", n, c.w);
}
break;
case PUSHSELF: printf ("%d PUSHSELF\n", (p++)-code); break;
case STOREINDEXED0: printf ("%d STOREINDEXED0\n", (p++)-code); break;
case STOREINDEXED: printf ("%d STOREINDEXED %d\n", p-code, *(++p));
p++;
@@ -912,6 +928,7 @@ static void PrintCode (Byte *code, Byte *end)
printf("%d STORERECORD %d\n", p-code, *(++p));
p += *p*sizeof(Word) + 1;
break;
case ADJUST0: printf ("%d ADJUST0\n", (p++)-code); break;
case ADJUST:
printf ("%d ADJUST %d\n", p-code, *(++p));
p++;
@@ -922,7 +939,7 @@ static void PrintCode (Byte *code, Byte *end)
int n = p-code;
p++;
get_word(c,p);
printf ("%d CREATEARRAY\n", n, c.w);
printf ("%d CREATEARRAY %d\n", n, c.w);
break;
}
case EQOP: printf ("%d EQOP\n", (p++)-code); break;
@@ -990,16 +1007,19 @@ static void PrintCode (Byte *code, Byte *end)
}
break;
case POP: printf ("%d POP\n", (p++)-code); break;
case CALLFUNC: printf ("%d CALLFUNC\n", (p++)-code); break;
case CALLFUNC:
printf ("%d CALLFUNC %d %d\n", p-code, *(p+1), *(p+2));
p+=3;
break;
case RETCODE0: printf ("%d RETCODE0\n", (p++)-code); break;
case RETCODE:
printf ("%d RETCODE %d\n", p-code, *(++p));
p++;
break;
case HALT: printf ("%d HALT\n", (p++)-code); break;
case SETFUNCTION:
{
CodeCode c1;
CodeWord c1;
CodeWord c2;
int n = p-code;
p++;
get_code(c1,p);