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cmd/compile: implement slice-to-array conversions

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The conversion T(x) is implemented as *(*T)(x). Accordingly, runtime
panic messages for (*T)(x) are made more general.

Fixes #46505.

Change-Id: I76317c0878b6a5908299506d392eed50d7ef6523
Reviewed-on: https://go-review.googlesource.com/c/go/+/430415
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Jenny Rakoczy <jenny@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Matthew Dempsky 2022-09-12 13:01:57 -07:00
parent 29153be757
commit ceffdc8545
15 changed files with 210 additions and 148 deletions
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4
src/runtime/panic.go
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@ -197,9 +197,9 @@ func goPanicSlice3CU(x uint, y int) {
panic(boundsError{x: int64(x), signed: false, y: y, code: boundsSlice3C})
}
// failures in the conversion (*[x]T)s, 0 <= x <= y, x == cap(s)
// failures in the conversion ([x]T)(s) or (*[x]T)(s), 0 <= x <= y, y == len(s)
func goPanicSliceConvert(x int, y int) {
panicCheck1(getcallerpc(), "slice length too short to convert to pointer to array")
panicCheck1(getcallerpc(), "slice length too short to convert to array or pointer to array")
panic(boundsError{x: int64(x), signed: true, y: y, code: boundsConvert})
}