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cmd/compile: allow conversion from slice to array ptr

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Panic if the slice is too short.

Updates #395

Change-Id: I90f4bff2da5d8f3148ba06d2482084f32b25c29a
Reviewed-on: https://go-review.googlesource.com/c/go/+/301650
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Josh Bleecher Snyder 2021-03-14 14:24:47 -07:00
parent 1c268431f4
commit faa4fa1a6e
33 changed files with 380 additions and 141 deletions
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7
src/runtime/panic.go
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@ -160,6 +160,12 @@ 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)
func goPanicSliceConvert(x int, y int) {
panicCheck1(getcallerpc(), "slice length too short to convert to pointer to array")
panic(boundsError{x: int64(x), signed: true, y: y, code: boundsConvert})
}
// Implemented in assembly, as they take arguments in registers.
// Declared here to mark them as ABIInternal.
func panicIndex(x int, y int)
@ -178,6 +184,7 @@ func panicSlice3B(x int, y int)
func panicSlice3BU(x uint, y int)
func panicSlice3C(x int, y int)
func panicSlice3CU(x uint, y int)
func panicSliceConvert(x int, y int)
var shiftError = error(errorString("negative shift amount"))