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Fix edge cases when recording string.byte/sub.

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Thanks to Sergey Kaplun. #1443
This commit is contained in:
Mike Pall
2026-03-04 11:18:28 +01:00
parent 02e2999558
commit 89f268b3f7
1 changed files with 3 additions and 3 deletions
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6
src/lj_ffrecord.c
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@@ -703,7 +703,7 @@ static void LJ_FASTCALL recff_string_range(jit_State *J, RecordFFData *rd)
} }
} }
if (rd->data) { /* Return string.sub result. */ if (rd->data) { /* Return string.sub result. */
if (end - start >= 0) { if (start <= end) {
/* Also handle empty range here, to avoid extra traces. */ /* Also handle empty range here, to avoid extra traces. */
TRef trptr, trslen = emitir(IRTGI(IR_SUBOV), trend, trstart); TRef trptr, trslen = emitir(IRTGI(IR_SUBOV), trend, trstart);
emitir(IRTGI(IR_GE), trslen, tr0); emitir(IRTGI(IR_GE), trslen, tr0);
@@ -714,8 +714,8 @@ static void LJ_FASTCALL recff_string_range(jit_State *J, RecordFFData *rd)
J->base[0] = lj_ir_kstr(J, lj_str_new(J->L, strdata(str), 0)); J->base[0] = lj_ir_kstr(J, lj_str_new(J->L, strdata(str), 0));
} }
} else { /* Return string.byte result(s). */ } else { /* Return string.byte result(s). */
ptrdiff_t i, len = end - start; if (start < end) {
if (len > 0) { ptrdiff_t i, len = end - start;
TRef trslen = emitir(IRTGI(IR_SUBOV), trend, trstart); TRef trslen = emitir(IRTGI(IR_SUBOV), trend, trstart);
emitir(IRTGI(IR_EQ), trslen, lj_ir_kint(J, (int32_t)len)); emitir(IRTGI(IR_EQ), trslen, lj_ir_kint(J, (int32_t)len));
if (J->baseslot + len > LJ_MAX_JSLOTS) if (J->baseslot + len > LJ_MAX_JSLOTS)