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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime
import (
"runtime/internal/math"
"unsafe"
)
func unsafestring(ptr unsafe.Pointer, len int) {
if len < 0 {
panicunsafestringlen()
}
if uintptr(len) > -uintptr(ptr) {
if ptr == nil {
panicunsafestringnilptr()
}
panicunsafestringlen()
}
}
// Keep this code in sync with cmd/compile/internal/walk/builtin.go:walkUnsafeString
func unsafestring64(ptr unsafe.Pointer, len64 int64) {
len := int(len64)
if int64(len) != len64 {
panicunsafestringlen()
}
unsafestring(ptr, len)
}
func unsafestringcheckptr(ptr unsafe.Pointer, len64 int64) {
unsafestring64(ptr, len64)
// Check that underlying array doesn't straddle multiple heap objects.
// unsafestring64 has already checked for overflow.
if checkptrStraddles(ptr, uintptr(len64)) {
throw("checkptr: unsafe.String result straddles multiple allocations")
}
}
func panicunsafestringlen() {
panic(errorString("unsafe.String: len out of range"))
}
func panicunsafestringnilptr() {
panic(errorString("unsafe.String: ptr is nil and len is not zero"))
}
// Keep this code in sync with cmd/compile/internal/walk/builtin.go:walkUnsafeSlice
func unsafeslice(et *_type, ptr unsafe.Pointer, len int) {
if len < 0 {
panicunsafeslicelen()
}
if et.size == 0 {
if ptr == nil && len > 0 {
panicunsafeslicenilptr()
}
}
mem, overflow := math.MulUintptr(et.size, uintptr(len))
if overflow || mem > -uintptr(ptr) {
if ptr == nil {
panicunsafeslicenilptr()
}
panicunsafeslicelen()
}
}
// Keep this code in sync with cmd/compile/internal/walk/builtin.go:walkUnsafeSlice
func unsafeslice64(et *_type, ptr unsafe.Pointer, len64 int64) {
len := int(len64)
if int64(len) != len64 {
panicunsafeslicelen()
}
unsafeslice(et, ptr, len)
}
func unsafeslicecheckptr(et *_type, ptr unsafe.Pointer, len64 int64) {
unsafeslice64(et, ptr, len64)
// Check that underlying array doesn't straddle multiple heap objects.
// unsafeslice64 has already checked for overflow.
if checkptrStraddles(ptr, uintptr(len64)*et.size) {
throw("checkptr: unsafe.Slice result straddles multiple allocations")
}
}
func panicunsafeslicelen() {
panic(errorString("unsafe.Slice: len out of range"))
}
func panicunsafeslicenilptr() {
panic(errorString("unsafe.Slice: ptr is nil and len is not zero"))
}
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