31 lines
619 B
Go
31 lines
619 B
Go
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//go:build !go1.18
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// +build !go1.18
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package json
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import (
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"reflect"
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"unsafe"
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)
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//go:linkname unsafe_NewArray reflect.unsafe_NewArray
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func unsafe_NewArray(rtype unsafe.Pointer, length int) unsafe.Pointer
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//go:linkname typedslicecopy reflect.typedslicecopy
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//go:noescape
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func typedslicecopy(elemType unsafe.Pointer, dst, src slice) int
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func extendSlice(t reflect.Type, s *slice, n int) slice {
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elemTypeRef := t.Elem()
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elemTypePtr := ((*iface)(unsafe.Pointer(&elemTypeRef))).ptr
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d := slice{
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data: unsafe_NewArray(elemTypePtr, n),
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len: s.len,
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cap: n,
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}
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typedslicecopy(elemTypePtr, d, *s)
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return d
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}
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