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Avoid assertion in case of stack overflow from stitched trace.

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Reported by Sergey Bronnikov. Fixed by Sergey Kaplun.
This commit is contained in:
Mike Pall 2022-11-27 15:25:32 +01:00
parent 46aa45dcbd
commit 1d75cd4d7b
1 changed files with 6 additions and 3 deletions
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9
src/lj_debug.c
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@ -101,9 +101,12 @@ static BCPos debug_framepc(lua_State *L, GCfunc *fn, cTValue *nextframe)
pos = proto_bcpos(pt, ins) - 1; pos = proto_bcpos(pt, ins) - 1;
#if LJ_HASJIT #if LJ_HASJIT
if (pos > pt->sizebc) { /* Undo the effects of lj_trace_exit for JLOOP. */ if (pos > pt->sizebc) { /* Undo the effects of lj_trace_exit for JLOOP. */
GCtrace *T = (GCtrace *)((char *)(ins-1) - offsetof(GCtrace, startins)); if (bc_isret(bc_op(ins[-1]))) {
lj_assertL(bc_isret(bc_op(ins[-1])), "return bytecode expected"); GCtrace *T = (GCtrace *)((char *)(ins-1) - offsetof(GCtrace, startins));
pos = proto_bcpos(pt, mref(T->startpc, const BCIns)); pos = proto_bcpos(pt, mref(T->startpc, const BCIns));
} else {
pos = NO_BCPOS; /* Punt in case of stack overflow for stitched trace. */
}
} }
#endif #endif
return pos; return pos;