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author | Matthew Dempsky <mdempsky@google.com> | 2021-04-21 02:11:15 -0700 |
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committer | Matthew Dempsky <mdempsky@google.com> | 2021-05-02 20:38:13 +0000 |
commit | fadad851a3222867b374e901ede9c4919594837f (patch) | |
tree | 7b4efe046ea2da139b27ce5091d0cbd058bdf331 /src/runtime/slice.go | |
parent | 0d32d9e8a8784cf3ef39c471b73e502c51085b6d (diff) | |
download | go-fadad851a3222867b374e901ede9c4919594837f.tar.gz go-fadad851a3222867b374e901ede9c4919594837f.zip |
cmd/compile: implement unsafe.Add and unsafe.Slice
Updates #19367.
Updates #40481.
Change-Id: Iabd2afdd0d520e5d68fd9e6dedd013335a4b3886
Reviewed-on: https://go-review.googlesource.com/c/go/+/312214
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/runtime/slice.go')
-rw-r--r-- | src/runtime/slice.go | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/runtime/slice.go b/src/runtime/slice.go index c0647d95a0..f9d4154acf 100644 --- a/src/runtime/slice.go +++ b/src/runtime/slice.go @@ -112,6 +112,25 @@ func makeslice64(et *_type, len64, cap64 int64) unsafe.Pointer { return makeslice(et, len, cap) } +func unsafeslice(et *_type, len int) { + mem, overflow := math.MulUintptr(et.size, uintptr(len)) + if overflow || mem > maxAlloc || len < 0 { + panicunsafeslicelen() + } +} + +func unsafeslice64(et *_type, len64 int64) { + len := int(len64) + if int64(len) != len64 { + panicunsafeslicelen() + } + unsafeslice(et, len) +} + +func panicunsafeslicelen() { + panic(errorString("unsafe.Slice: len out of range")) +} + // growslice handles slice growth during append. // It is passed the slice element type, the old slice, and the desired new minimum capacity, // and it returns a new slice with at least that capacity, with the old data |