lua

commit ad6c7b0dd4b31965ccf6f1c02448f4c306cc316b
parent 8b2d97d1871147c730a986656907837458b601f8
Author: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date:   Tue,  9 Feb 1999 13:58:48 -0200

small corrections in opcodes.

Diffstat:
M
lopcodes.h
 | 
18
++++++++++--------
M
lparser.c
 | 
13
++++++++-----
M
lvm.c
 | 
16
++++++++++++----

3 files changed, 30 insertions(+), 17 deletions(-)
diff --git a/lopcodes.h b/lopcodes.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.h,v 1.22 1999/02/08 17:07:59 roberto Exp roberto $
+** $Id: lopcodes.h,v 1.23 1999/02/08 18:54:19 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -21,11 +21,14 @@ ENDCODE,/*	-	-		-  */
 RETCODE,/*	b	-		-  */
 
 PUSHNIL,/*	b	-		nil_0...nil_b  */
-POP,/*		b	-		-		TOP-=(b+1)  */
-POPDUP,/*	b	v		v		TOP-=(b+1)  */
+POP,/*		b	-		-		TOP-=b  */
+POPDUP,/*	b	v		v		TOP-=b  */
 
-PUSHNUMBERW,/*	w	-		(float)(w-NUMOFFSET)  */
-PUSHNUMBER,/*	b	-		(float)(b-NUMOFFSET)  */
+PUSHNUMBERW,/*	w	-		(float)w */
+PUSHNUMBER,/*	b	-		(float)b */
+
+PUSHNEGW,/*	w	-		(float)-w */
+PUSHNEG,/*	b	-		(float)-b */
 
 PUSHCONSTANTW,/*w	-		CNST[w] */
 PUSHCONSTANT,/*	b	-		CNST[b] */
@@ -57,7 +60,7 @@ SETGLOBALDUPW,/*w	x		x		VAR[CNST[w]]=x  */
 SETGLOBALDUP,/*	b	x		x		VAR[CNST[b]]=x  */
 
 SETTABLEPOP,/*	-	v i t		-		t[i]=v  */
-SETTABPPDUP,/*	-	v i t		v		t[i]=v  */
+SETTABLEPOPDUP,/* -	v i t		v		t[i]=v  */
 
 SETTABLE,/*	b	v a_b...a_1 i t	a_b...a_1 i t	t[i]=v  */
 SETTABLEDUP,/*	b	v a_b...a_1 i t	v a_b...a_1 i t	t[i]=v  */
@@ -95,6 +98,7 @@ IFTUPJMP,/*	b	x		-		(x!=nil)? PC-=b  */
 IFFUPJMPW,/*	w	x		-		(x==nil)? PC-=w  */
 IFFUPJMP,/*	b	x		-		(x==nil)? PC-=b  */
 
+CLOSUREW,/*	w c	v_c...v_1	closure(CNST[w], v_c...v_1) */
 CLOSURE,/*	b c	v_c...v_1	closure(CNST[b], v_c...v_1) */
 
 CALLFUNC,/*	b c	v_c...v_1 f	r_b...r_1	f(v1,...,v_c)  */
@@ -107,8 +111,6 @@ LONGARG /*	b	(add b*(1<<16) to arg of next instruction) */
 } OpCode;
 
 
-#define NUMOFFSET	100	/* offset for immediate numbers */
-
 #define RFIELDS_PER_FLUSH 32	/* records (SETMAP) */
 #define LFIELDS_PER_FLUSH 64    /* FPF - lists (SETLIST) */
 
diff --git a/lparser.c b/lparser.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 1.17 1999/02/08 17:07:59 roberto Exp roberto $
+** $Id: lparser.c,v 1.18 1999/02/08 18:54:19 roberto Exp roberto $
 ** LL(1) Parser and code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -267,9 +267,11 @@ static int real_constant (FuncState *fs, real r) {
 
 
 static void code_number (LexState *ls, real f) {
-  if (-NUMOFFSET <= f && f <= (real)(MAX_WORD-NUMOFFSET) &&
-      (int)f == f)  /* f+NUMOFFSET has a short integer value? */
-    code_oparg(ls, PUSHNUMBER, (int)f+NUMOFFSET, 1);
+  real af = (f<0) ? -f : f;
+  if (0 <= af && af <= (real)MAX_WORD && (int)af == af) {
+    /* abs(f) has a short integer value */
+    code_oparg(ls, (f<0) ? PUSHNEG : PUSHNUMBER, (int)af, 1);
+  }
   else
     code_constant(ls, real_constant(ls->fs, f));
 }
@@ -474,7 +476,7 @@ static void lua_pushvar (LexState *ls, vardesc *var) {
 
 /* to be used by "storevar" and assignment */
 static OpCode set_pop[] = {SETLOCAL, SETGLOBAL, SETTABLEPOP, SETTABLE};
-static OpCode set_dup[] = {SETLOCALDUP, SETGLOBALDUP, SETTABPPDUP,
+static OpCode set_dup[] = {SETLOCALDUP, SETGLOBALDUP, SETTABLEPOPDUP,
                            SETTABLEDUP};
 
 
@@ -563,6 +565,7 @@ static void init_state (LexState *ls, FuncState *fs, TaggedString *filename) {
   incr_top;
 }
 
+
 static void close_func (LexState *ls) {
   FuncState *fs = ls->fs;
   TProtoFunc *f = fs->f;
diff --git a/lvm.c b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 1.46 1999/02/08 17:07:59 roberto Exp roberto $
+** $Id: lvm.c,v 1.47 1999/02/08 18:54:19 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -355,7 +355,14 @@ StkId luaV_execute (Closure *cl, TProtoFunc *tf, StkId base) {
       case PUSHNUMBERW: aux += highbyte(*pc++);
       case PUSHNUMBER:  aux += *pc++;
         ttype(S->top) = LUA_T_NUMBER;
-        nvalue(S->top) = aux-NUMOFFSET;
+        nvalue(S->top) = aux;
+        S->top++;
+        break;
+
+      case PUSHNEGW: aux += highbyte(*pc++);
+      case PUSHNEG:  aux += *pc++;
+        ttype(S->top) = LUA_T_NUMBER;
+        nvalue(S->top) = -aux;
         S->top++;
         break;
 
@@ -429,7 +436,7 @@ StkId luaV_execute (Closure *cl, TProtoFunc *tf, StkId base) {
         S->top -= 2;  /* pop table and index */
         break;
 
-      case SETTABPPDUP: {
+      case SETTABLEPOPDUP: {
         TObject temp = *(S->top-1);
         luaV_settable(S->top-3);
         S->top--;  /* pop index (temp goes into "table" position) */
@@ -605,7 +612,8 @@ StkId luaV_execute (Closure *cl, TProtoFunc *tf, StkId base) {
         if (ttype(--S->top) == LUA_T_NIL) pc -= aux;
         break;
 
-      case CLOSURE:  aux = *pc++;
+      case CLOSUREW: aux += highbyte(*pc++);
+      case CLOSURE:  aux += *pc++;
         *S->top++ = consts[aux];
         luaV_closure(*pc++);
         luaC_checkGC();