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builtin: Fix undefined behaviour when allocating empty structs (#4088)

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radare 2020-03-21 12:24:34 +01:00 committed by GitHub
parent 7b1b647832
commit cc75fe4fe5
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2 changed files with 14 additions and 2 deletions

View File

@ -177,6 +177,9 @@ pub fn free(ptr voidptr) {
} }
pub fn memdup(src voidptr, sz int) voidptr { pub fn memdup(src voidptr, sz int) voidptr {
if sz == 0 {
return vcalloc(1)
}
mem := malloc(sz) mem := malloc(sz)
return C.memcpy(mem, src, sz) return C.memcpy(mem, src, sz)
} }

View File

@ -26,6 +26,9 @@ struct Foo {
@type string @type string
} }
struct Empty {
}
//We need to make sure that this compiles with all the reserved names. //We need to make sure that this compiles with all the reserved names.
struct ReservedKeywords { struct ReservedKeywords {
delete int delete int
@ -55,6 +58,12 @@ struct ReservedKeywords {
while int while int
} }
fn test_empty_struct() {
d := &Empty{}
println(d) // != voidptr(0)
println(sizeof(Empty)) // == 0
}
fn test_struct_levels() { fn test_struct_levels() {
mut c := C{} mut c := C{}
assert c.nums.len == 0 assert c.nums.len == 0