ARM64: Followup fix for exit branch patching.

Mike Pall · Mike Pall · commit e67e2040be69 · 2020-09-28T18:17:58.000+02:00
diff --git a/src/lj_asm_arm64.h b/src/lj_asm_arm64.h
@@ -2021,7 +2021,7 @@ void lj_asm_patchexit(jit_State *J, GCtrace *T, ExitNo exitno, MCode *target)
     *px = A64I_B | A64F_S26(delta);
     if (!cstart) cstart = px;
   }
-  lj_mcode_sync(cstart, px+1);
+  if (cstart) lj_mcode_sync(cstart, px+1);
   lj_mcode_patch(J, mcarea, 1);
 }
 

Original file line number	Diff line number	Diff line change
`@@ -2021,7 +2021,7 @@ void lj_asm_patchexit(jit_State J, GCtrace T, ExitNo exitno, MCode *target)`
`2021`	`2021`	`*px = A64I_B \| A64F_S26(delta);`
`2022`	`2022`	`if (!cstart) cstart = px;`
`2023`	`2023`	`}`
`2024`		`- lj_mcode_sync(cstart, px+1);`
	`2024`	`+ if (cstart) lj_mcode_sync(cstart, px+1);`
`2025`	`2025`	`lj_mcode_patch(J, mcarea, 1);`
`2026`	`2026`	`}`
`2027`	`2027`