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Fix bytecode JMP slot range after const + and/or optimization.

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Mike Pall 2012-04-11 15:17:11 +02:00
parent 44876ec99f
commit 39112fd6fb
1 changed files with 15 additions and 12 deletions
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25
src/lj_parse.c
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@ -269,20 +269,23 @@ static int jmp_novalue(FuncState *fs, BCPos list)
/* Patch register of test instructions. */ /* Patch register of test instructions. */
static int jmp_patchtestreg(FuncState *fs, BCPos pc, BCReg reg) static int jmp_patchtestreg(FuncState *fs, BCPos pc, BCReg reg)
{ {
BCIns *ip = &fs->bcbase[pc >= 1 ? pc-1 : pc].ins; BCInsLine *ilp = &fs->bcbase[pc >= 1 ? pc-1 : pc];
BCOp op = bc_op(*ip); BCOp op = bc_op(ilp->ins);
if (op == BC_ISTC || op == BC_ISFC) { if (op == BC_ISTC || op == BC_ISFC) {
if (reg != NO_REG && reg != bc_d(*ip)) { if (reg != NO_REG && reg != bc_d(ilp->ins)) {
setbc_a(ip, reg); setbc_a(&ilp->ins, reg);
} else { /* Nothing to store or already in the right register. */ } else { /* Nothing to store or already in the right register. */
setbc_op(ip, op+(BC_IST-BC_ISTC)); setbc_op(&ilp->ins, op+(BC_IST-BC_ISTC));
setbc_a(ip, 0); setbc_a(&ilp->ins, 0);
}
} else if (bc_a(ilp->ins) == NO_REG) {
if (reg == NO_REG) {
ilp->ins = BCINS_AJ(BC_JMP, bc_a(fs->bcbase[pc].ins), 0);
} else {
setbc_a(&ilp->ins, reg);
if (reg >= bc_a(ilp[1].ins))
setbc_a(&ilp[1].ins, reg+1);
} }
} else if (bc_a(*ip) == NO_REG) {
if (reg == NO_REG)
*ip = BCINS_AJ(BC_JMP, bc_a(fs->bcbase[pc].ins), 0);
else
setbc_a(ip, reg);
} else { } else {
return 0; /* Cannot patch other instructions. */ return 0; /* Cannot patch other instructions. */
} }