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small bug in symbolic execution

This commit is contained in:
Roberto Ierusalimschy 2000-08-14 14:46:27 -03:00
parent f555e493f0
commit 58453dc1e1
3 changed files with 28 additions and 19 deletions
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5
lcode.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lcode.c,v 1.46 2000/08/09 19:16:57 roberto Exp roberto $
** $Id: lcode.c,v 1.47 2000/08/10 19:50:47 roberto Exp roberto $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
@ -330,7 +330,8 @@ void luaK_tostack (LexState *ls, expdesc *v, int onlyone) {
luaK_concat(fs, &v->u.l.t, fs->pc-1); /* put `previous' in t. list */
else {
j = code_label(fs, OP_JMP, NO_JUMP); /* to jump over both pushes */
luaK_deltastack(fs, -1); /* next PUSHes may be skipped */
/* correct stack for compiler and simbolic execution */
luaK_adjuststack(fs, 1);
}
p_nil = code_label(fs, OP_PUSHNILJMP, 0);
p_1 = code_label(fs, OP_PUSHINT, 1);

37
ldebug.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ldebug.c,v 1.32 2000/08/10 19:50:47 roberto Exp roberto $
** $Id: ldebug.c,v 1.33 2000/08/11 16:17:28 roberto Exp roberto $
** Debug Interface
** See Copyright Notice in lua.h
*/
@ -296,11 +296,15 @@ static Instruction luaG_symbexec (const Proto *pt, int lastpc, int stackpos) {
const Instruction i = code[pc++];
LUA_ASSERT(0 <= top && top <= pt->maxstacksize, "wrong stack");
switch (GET_OPCODE(i)) {
case OP_RETURN:
case OP_TAILCALL:
case OP_END: {
LUA_INTERNALERROR("invalid symbolic run");
return CREATE_0(OP_END); /* stop execution */
case OP_RETURN: {
LUA_ASSERT(top >= GETARG_U(i), "wrong stack");
top = GETARG_U(i);
break;
}
case OP_TAILCALL: {
LUA_ASSERT(top >= GETARG_A(i), "wrong stack");
top = GETARG_B(i);
break;
}
case OP_CALL: {
int nresults = GETARG_B(i);
@ -336,6 +340,18 @@ static Instruction luaG_symbexec (const Proto *pt, int lastpc, int stackpos) {
stack[top++] = pc-1;
break;
}
case OP_JMPONT:
case OP_JMPONF: {
int newpc = pc + GETARG_S(i);
/* jump is forward and do not skip `lastpc'? */
if (pc < newpc && newpc <= lastpc) {
stack[top-1] = pc-1; /* value comes from `and'/`or' */
pc = newpc; /* do the jump */
}
else
top--; /* do not jump; pop value */
break;
}
default: {
OpCode op = GET_OPCODE(i);
LUA_ASSERT(luaK_opproperties[op].push != VD,
@ -343,15 +359,6 @@ static Instruction luaG_symbexec (const Proto *pt, int lastpc, int stackpos) {
top -= luaK_opproperties[op].pop;
LUA_ASSERT(top >= 0, "wrong stack");
top = pushpc(stack, pc, top, luaK_opproperties[op].push);
if (ISJUMP(op)) {
int newpc = pc + GETARG_S(i);
/* jump is forward and do not skip `lastpc'? */
if (pc < newpc && newpc <= lastpc) {
if (op == OP_JMPONT || op == OP_JMPONF)
stack[top++] = pc-1; /* do not pop when jumping */
pc = newpc; /* do the jump */
}
}
}
}
}

5
lparser.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lparser.c,v 1.106 2000/08/09 14:49:13 roberto Exp roberto $
** $Id: lparser.c,v 1.107 2000/08/09 19:16:57 roberto Exp roberto $
** LL(1) Parser and code generator for Lua
** See Copyright Notice in lua.h
*/
@ -1024,7 +1024,8 @@ static void breakstat (LexState *ls) {
next(ls); /* skip BREAK */
luaK_adjuststack(fs, currentlevel - bl->stacklevel);
luaK_concat(fs, &bl->breaklist, luaK_jump(fs));
fs->stacklevel = currentlevel;
/* correct stack for compiler and simbolic execution */
luaK_adjuststack(fs, bl->stacklevel - currentlevel);
}