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cmd/compile: disallow converting string to notinheap slice
Unlikely to happen in practice, but easy enough to prevent and might as well do so for completeness. Fixes #28243. Change-Id: I848c3af49cb923f088e9490c6a79373e182fad08 Reviewed-on: https://go-review.googlesource.com/c/142719 Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Austin Clements <austin@google.com>
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@ -696,14 +696,22 @@ func convertop(src *types.Type, dst *types.Type, why *string) Op {
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}
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// Conversions from regular to go:notinheap are not allowed
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// (unless it's unsafe.Pointer). This is a runtime-specific
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// rule.
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// (unless it's unsafe.Pointer). These are runtime-specific
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// rules.
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// (a) Disallow (*T) to (*U) where T is go:notinheap but U isn't.
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if src.IsPtr() && dst.IsPtr() && dst.Elem().NotInHeap() && !src.Elem().NotInHeap() {
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if why != nil {
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*why = fmt.Sprintf(":\n\t%v is go:notinheap, but %v is not", dst.Elem(), src.Elem())
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}
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return 0
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}
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// (b) Disallow string to []T where T is go:notinheap.
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if src.IsString() && dst.IsSlice() && dst.Elem().NotInHeap() && (dst.Elem().Etype == types.Bytetype.Etype || dst.Elem().Etype == types.Runetype.Etype) {
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if why != nil {
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*why = fmt.Sprintf(":\n\t%v is go:notinheap", dst.Elem())
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}
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return 0
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}
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// 1. src can be assigned to dst.
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op := assignop(src, dst, why)
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@ -46,10 +46,18 @@ type t1 struct{ x int }
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//go:notinheap
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type t2 t1
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//go:notinheap
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type t3 byte
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//go:notinheap
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type t4 rune
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var sink interface{}
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func i() {
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sink = new(t1) // no error
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sink = (*t2)(new(t1)) // ERROR "cannot convert(.|\n)*t2 is go:notinheap"
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sink = (*t2)(new(struct{ x int })) // ERROR "cannot convert(.|\n)*t2 is go:notinheap"
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sink = []t3("foo") // ERROR "cannot convert(.|\n)*t3 is go:notinheap"
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sink = []t4("bar") // ERROR "cannot convert(.|\n)*t4 is go:notinheap"
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}
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