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Throw any errors before stack changes in trace stitching.

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Thanks to doujiang24.
This commit is contained in:
Mike Pall 2021-06-14 14:56:54 +02:00
parent c1c4c5599c
commit 3f9389edc6
1 changed files with 4 additions and 0 deletions
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4
src/lj_ffrecord.c
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@ -107,6 +107,10 @@ static void recff_stitch(jit_State *J)
const BCIns *pc = frame_pc(base-1); const BCIns *pc = frame_pc(base-1);
TValue *pframe = frame_prevl(base-1); TValue *pframe = frame_prevl(base-1);
/* Check for this now. Throwing in lj_record_stop messes up the stack. */
if (J->cur.nsnap >= (MSize)J->param[JIT_P_maxsnap])
lj_trace_err(J, LJ_TRERR_SNAPOV);
/* Move func + args up in Lua stack and insert continuation. */ /* Move func + args up in Lua stack and insert continuation. */
memmove(&base[1], &base[-1-LJ_FR2], sizeof(TValue)*nslot); memmove(&base[1], &base[-1-LJ_FR2], sizeof(TValue)*nslot);
setframe_ftsz(nframe, ((char *)nframe - (char *)pframe) + FRAME_CONT); setframe_ftsz(nframe, ((char *)nframe - (char *)pframe) + FRAME_CONT);