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23 lines
768 B
23 lines
768 B
5 years ago
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--- a/src/lapi.c
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+++ b/src/lapi.c
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@@ -1285,14 +1285,14 @@ LUA_API void *lua_upvalueid (lua_State *
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LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
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int fidx2, int n2) {
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- LClosure *f1;
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- UpVal **up1 = getupvalref(L, fidx1, n1, &f1);
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+ UpVal **up1 = getupvalref(L, fidx1, n1, NULL); /* the last parameter not needed */
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UpVal **up2 = getupvalref(L, fidx2, n2, NULL);
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+ if (*up1 == *up2) return; /* Already joined */
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+ (*up2)->refcount++;
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+ if (upisopen(*up2)) (*up2)->u.open.touched = 1;
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+ luaC_upvalbarrier(L, *up2);
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luaC_upvdeccount(L, *up1);
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*up1 = *up2;
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- (*up1)->refcount++;
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- if (upisopen(*up1)) (*up1)->u.open.touched = 1;
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- luaC_upvalbarrier(L, *up1);
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}
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