cmd/compile: add support for unsafe.{String,StringData,SliceData}

For #53003

Change-Id: I13a761daca8b433b271a1feb711c103d9820772d
Reviewed-on: https://go-review.googlesource.com/c/go/+/423774
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: hopehook <hopehook@golangcn.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/runtime/testdata/testprog/checkptr.go b/src/runtime/testdata/testprog/checkptr.go
index b27e5f74f8..60e71e66d7 100644
--- a/src/runtime/testdata/testprog/checkptr.go
+++ b/src/runtime/testdata/testprog/checkptr.go
@@ -20,6 +20,8 @@ func init() {
 	register("CheckPtrSmall", CheckPtrSmall)
 	register("CheckPtrSliceOK", CheckPtrSliceOK)
 	register("CheckPtrSliceFail", CheckPtrSliceFail)
+	register("CheckPtrStringOK", CheckPtrStringOK)
+	register("CheckPtrStringFail", CheckPtrStringFail)
 	register("CheckPtrAlignmentNested", CheckPtrAlignmentNested)
 }
 
@@ -98,6 +100,17 @@ func CheckPtrSliceFail() {
 	sink2 = unsafe.Slice(p, 100)
 }
 
+func CheckPtrStringOK() {
+	p := new([4]byte)
+	sink2 = unsafe.String(&p[1], 3)
+}
+
+func CheckPtrStringFail() {
+	p := new(byte)
+	sink2 = p
+	sink2 = unsafe.String(p, 100)
+}
+
 func CheckPtrAlignmentNested() {
 	s := make([]int8, 100)
 	p := unsafe.Pointer(&s[0])