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builtin: Fix undefined behaviour when allocating empty structs (#4088)
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@ -177,6 +177,9 @@ pub fn free(ptr voidptr) {
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}
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pub fn memdup(src voidptr, sz int) voidptr {
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if sz == 0 {
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return vcalloc(1)
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}
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mem := malloc(sz)
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return C.memcpy(mem, src, sz)
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}
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@ -26,6 +26,9 @@ struct Foo {
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@type string
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}
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struct Empty {
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}
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//We need to make sure that this compiles with all the reserved names.
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struct ReservedKeywords {
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delete int
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@ -55,6 +58,12 @@ struct ReservedKeywords {
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while int
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}
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fn test_empty_struct() {
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d := &Empty{}
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println(d) // != voidptr(0)
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println(sizeof(Empty)) // == 0
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}
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fn test_struct_levels() {
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mut c := C{}
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assert c.nums.len == 0
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