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bug: Wrong error message in some short-cut expressions

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Roberto Ierusalimschy 2013-07-10 17:32:36 -03:00
parent 2f8c51a552
commit 98d76cdcae
1 changed files with 19 additions and 11 deletions
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30
ldebug.c
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@ -1,5 +1,5 @@
/*
** $Id: ldebug.c,v 2.94 2013/04/29 16:58:10 roberto Exp roberto $
** $Id: ldebug.c,v 2.95 2013/05/06 17:21:59 roberto Exp $
** Debug Interface
** See Copyright Notice in lua.h
*/
@ -327,12 +327,20 @@ static void kname (Proto *p, int pc, int c, const char **name) {
}
static int filterpc (int pc, int jmptarget) {
if (pc < jmptarget) /* is code conditional (inside a jump)? */
return -1; /* cannot know who sets that register */
else return pc; /* current position sets that register */
}
/*
** try to find last instruction before 'lastpc' that modified register 'reg'
*/
static int findsetreg (Proto *p, int lastpc, int reg) {
int pc;
int setreg = -1; /* keep last instruction that changed 'reg' */
int jmptarget = 0; /* any code before this address is conditional */
for (pc = 0; pc < lastpc; pc++) {
Instruction i = p->code[pc];
OpCode op = GET_OPCODE(i);
@ -341,33 +349,33 @@ static int findsetreg (Proto *p, int lastpc, int reg) {
case OP_LOADNIL: {
int b = GETARG_B(i);
if (a <= reg && reg <= a + b) /* set registers from 'a' to 'a+b' */
setreg = pc;
setreg = filterpc(pc, jmptarget);
break;
}
case OP_TFORCALL: {
if (reg >= a + 2) setreg = pc; /* affect all regs above its base */
if (reg >= a + 2) /* affect all regs above its base */
setreg = filterpc(pc, jmptarget);
break;
}
case OP_CALL:
case OP_TAILCALL: {
if (reg >= a) setreg = pc; /* affect all registers above base */
if (reg >= a) /* affect all registers above base */
setreg = filterpc(pc, jmptarget);
break;
}
case OP_JMP: {
int b = GETARG_sBx(i);
int dest = pc + 1 + b;
/* jump is forward and do not skip `lastpc'? */
if (pc < dest && dest <= lastpc)
pc += b; /* do the jump */
break;
}
case OP_TEST: {
if (reg == a) setreg = pc; /* jumped code can change 'a' */
if (pc < dest && dest <= lastpc) {
if (dest > jmptarget)
jmptarget = dest; /* update 'jmptarget' */
}
break;
}
default:
if (testAMode(op) && reg == a) /* any instruction that set A */
setreg = pc;
setreg = filterpc(pc, jmptarget);
break;
}
}