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-rw-r--r--serde_v8/magic/buffer.rs119
-rw-r--r--serde_v8/magic/bytestring.rs122
-rw-r--r--serde_v8/magic/mod.rs9
-rw-r--r--serde_v8/magic/string_or_buffer.rs45
-rw-r--r--serde_v8/magic/transl8.rs143
-rw-r--r--serde_v8/magic/u16string.rs83
-rw-r--r--serde_v8/magic/value.rs48
-rw-r--r--serde_v8/magic/zero_copy_buf.rs136
8 files changed, 705 insertions, 0 deletions
diff --git a/serde_v8/magic/buffer.rs b/serde_v8/magic/buffer.rs
new file mode 100644
index 000000000..484984ac5
--- /dev/null
+++ b/serde_v8/magic/buffer.rs
@@ -0,0 +1,119 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use std::ops::Deref;
+use std::ops::DerefMut;
+use std::sync::Mutex;
+
+use super::transl8::FromV8;
+use super::transl8::ToV8;
+use super::zero_copy_buf::ZeroCopyBuf;
+use crate::magic::transl8::impl_magic;
+
+// An asymmetric wrapper around ZeroCopyBuf,
+// allowing us to use a single type for familiarity
+pub enum MagicBuffer {
+ FromV8(ZeroCopyBuf),
+ ToV8(Mutex<Option<Box<[u8]>>>),
+}
+impl_magic!(MagicBuffer);
+
+impl MagicBuffer {
+ pub fn empty() -> Self {
+ MagicBuffer::ToV8(Mutex::new(Some(vec![0_u8; 0].into_boxed_slice())))
+ }
+}
+
+impl Clone for MagicBuffer {
+ fn clone(&self) -> Self {
+ match self {
+ Self::FromV8(zbuf) => Self::FromV8(zbuf.clone()),
+ Self::ToV8(_) => panic!("Don't Clone a MagicBuffer sent to v8"),
+ }
+ }
+}
+
+impl AsRef<[u8]> for MagicBuffer {
+ fn as_ref(&self) -> &[u8] {
+ &*self
+ }
+}
+
+impl AsMut<[u8]> for MagicBuffer {
+ fn as_mut(&mut self) -> &mut [u8] {
+ &mut *self
+ }
+}
+
+impl Deref for MagicBuffer {
+ type Target = [u8];
+ fn deref(&self) -> &[u8] {
+ match self {
+ Self::FromV8(buf) => &*buf,
+ Self::ToV8(_) => panic!("Don't Deref a MagicBuffer sent to v8"),
+ }
+ }
+}
+
+impl DerefMut for MagicBuffer {
+ fn deref_mut(&mut self) -> &mut [u8] {
+ match self {
+ Self::FromV8(buf) => &mut *buf,
+ Self::ToV8(_) => panic!("Don't Deref a MagicBuffer sent to v8"),
+ }
+ }
+}
+
+impl From<Box<[u8]>> for MagicBuffer {
+ fn from(buf: Box<[u8]>) -> Self {
+ MagicBuffer::ToV8(Mutex::new(Some(buf)))
+ }
+}
+
+impl From<Vec<u8>> for MagicBuffer {
+ fn from(vec: Vec<u8>) -> Self {
+ vec.into_boxed_slice().into()
+ }
+}
+
+impl ToV8 for MagicBuffer {
+ fn to_v8<'a>(
+ &self,
+ scope: &mut v8::HandleScope<'a>,
+ ) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
+ let buf: Box<[u8]> = match self {
+ Self::FromV8(buf) => {
+ let value: &[u8] = buf;
+ value.into()
+ }
+ Self::ToV8(x) => x.lock().unwrap().take().expect("MagicBuffer was empty"),
+ };
+
+ if buf.is_empty() {
+ let ab = v8::ArrayBuffer::new(scope, 0);
+ return Ok(
+ v8::Uint8Array::new(scope, ab, 0, 0)
+ .expect("Failed to create Uint8Array")
+ .into(),
+ );
+ }
+ let buf_len = buf.len();
+ let backing_store =
+ v8::ArrayBuffer::new_backing_store_from_boxed_slice(buf);
+ let backing_store_shared = backing_store.make_shared();
+ let ab = v8::ArrayBuffer::with_backing_store(scope, &backing_store_shared);
+ Ok(
+ v8::Uint8Array::new(scope, ab, 0, buf_len)
+ .expect("Failed to create Uint8Array")
+ .into(),
+ )
+ }
+}
+
+impl FromV8 for MagicBuffer {
+ fn from_v8(
+ scope: &mut v8::HandleScope,
+ value: v8::Local<v8::Value>,
+ ) -> Result<Self, crate::Error> {
+ Ok(Self::FromV8(ZeroCopyBuf::from_v8(scope, value)?))
+ }
+}
diff --git a/serde_v8/magic/bytestring.rs b/serde_v8/magic/bytestring.rs
new file mode 100644
index 000000000..43ac54b97
--- /dev/null
+++ b/serde_v8/magic/bytestring.rs
@@ -0,0 +1,122 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use std::ops::{Deref, DerefMut};
+
+use super::transl8::{FromV8, ToV8};
+use crate::magic::transl8::impl_magic;
+use crate::Error;
+
+#[derive(PartialEq, Eq, Clone, Debug)]
+pub struct ByteString(pub Vec<u8>);
+impl_magic!(ByteString);
+
+impl ByteString {
+ pub fn new() -> ByteString {
+ ByteString(Vec::new())
+ }
+
+ pub fn with_capacity(capacity: usize) -> ByteString {
+ ByteString(Vec::with_capacity(capacity))
+ }
+
+ pub fn capacity(&self) -> usize {
+ self.0.capacity()
+ }
+
+ pub fn reserve(&mut self, additional: usize) {
+ self.0.reserve(additional)
+ }
+
+ pub fn reserve_exact(&mut self, additional: usize) {
+ self.0.reserve_exact(additional)
+ }
+
+ pub fn shrink_to_fit(&mut self) {
+ self.0.shrink_to_fit()
+ }
+
+ pub fn truncate(&mut self, len: usize) {
+ self.0.truncate(len)
+ }
+
+ pub fn push(&mut self, value: u8) {
+ self.0.push(value)
+ }
+
+ pub fn pop(&mut self) -> Option<u8> {
+ self.0.pop()
+ }
+}
+
+impl Default for ByteString {
+ fn default() -> Self {
+ ByteString::new()
+ }
+}
+
+impl Deref for ByteString {
+ type Target = [u8];
+
+ fn deref(&self) -> &[u8] {
+ self.0.deref()
+ }
+}
+
+impl DerefMut for ByteString {
+ fn deref_mut(&mut self) -> &mut [u8] {
+ self.0.deref_mut()
+ }
+}
+
+impl AsRef<[u8]> for ByteString {
+ fn as_ref(&self) -> &[u8] {
+ self.0.as_ref()
+ }
+}
+
+impl AsMut<[u8]> for ByteString {
+ fn as_mut(&mut self) -> &mut [u8] {
+ self.0.as_mut()
+ }
+}
+
+impl ToV8 for ByteString {
+ fn to_v8<'a>(
+ &self,
+ scope: &mut v8::HandleScope<'a>,
+ ) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
+ let v =
+ v8::String::new_from_one_byte(scope, self, v8::NewStringType::Normal)
+ .unwrap();
+ Ok(v.into())
+ }
+}
+
+impl FromV8 for ByteString {
+ fn from_v8(
+ scope: &mut v8::HandleScope,
+ value: v8::Local<v8::Value>,
+ ) -> Result<Self, crate::Error> {
+ let v8str = v8::Local::<v8::String>::try_from(value)
+ .map_err(|_| Error::ExpectedString)?;
+ if !v8str.contains_only_onebyte() {
+ return Err(Error::ExpectedLatin1);
+ }
+ let len = v8str.length();
+ let mut buffer = Vec::with_capacity(len);
+ // SAFETY: we set length == capacity (see previous line),
+ // before immediately writing into that buffer and sanity check with an assert
+ #[allow(clippy::uninit_vec)]
+ unsafe {
+ buffer.set_len(len);
+ let written = v8str.write_one_byte(
+ scope,
+ &mut buffer,
+ 0,
+ v8::WriteOptions::NO_NULL_TERMINATION,
+ );
+ assert!(written == len);
+ }
+ Ok(ByteString(buffer))
+ }
+}
diff --git a/serde_v8/magic/mod.rs b/serde_v8/magic/mod.rs
new file mode 100644
index 000000000..bc86c6a7c
--- /dev/null
+++ b/serde_v8/magic/mod.rs
@@ -0,0 +1,9 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+pub mod buffer;
+pub mod bytestring;
+pub mod string_or_buffer;
+pub mod transl8;
+pub mod u16string;
+mod value;
+pub mod zero_copy_buf;
+pub use value::Value;
diff --git a/serde_v8/magic/string_or_buffer.rs b/serde_v8/magic/string_or_buffer.rs
new file mode 100644
index 000000000..edde2adcd
--- /dev/null
+++ b/serde_v8/magic/string_or_buffer.rs
@@ -0,0 +1,45 @@
+use std::ops::Deref;
+
+#[derive(Debug)]
+pub struct StringOrBuffer(Vec<u8>);
+
+impl Deref for StringOrBuffer {
+ type Target = Vec<u8>;
+ fn deref(&self) -> &Vec<u8> {
+ &self.0
+ }
+}
+
+impl StringOrBuffer {
+ pub fn into_bytes(self) -> Vec<u8> {
+ self.0
+ }
+}
+
+impl<'de> serde::Deserialize<'de> for StringOrBuffer {
+ fn deserialize<D>(deserializer: D) -> Result<StringOrBuffer, D::Error>
+ where
+ D: serde::Deserializer<'de>,
+ {
+ StringOrBufferInner::deserialize(deserializer)
+ .map(|x| StringOrBuffer(x.into_bytes()))
+ }
+}
+
+// TODO(@AaronO): explore if we can make this work with ZeroCopyBuf
+#[derive(serde::Deserialize)]
+#[serde(untagged)]
+enum StringOrBufferInner {
+ #[serde(with = "serde_bytes")]
+ Buffer(Vec<u8>),
+ String(String),
+}
+
+impl StringOrBufferInner {
+ fn into_bytes(self) -> Vec<u8> {
+ match self {
+ Self::String(s) => s.into_bytes(),
+ Self::Buffer(b) => b,
+ }
+ }
+}
diff --git a/serde_v8/magic/transl8.rs b/serde_v8/magic/transl8.rs
new file mode 100644
index 000000000..458b82129
--- /dev/null
+++ b/serde_v8/magic/transl8.rs
@@ -0,0 +1,143 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+//! Transerialization extends the set of serde-compatible types (for given de/serializers).
+//! By "hackishly" transmuting references across serde boundaries as u64s.
+//! Type-safety is enforced using special struct names for each "magic type".
+//! Memory-safety relies on transerialized values being "pinned" during de/serialization.
+
+pub(crate) const MAGIC_FIELD: &str = "$__v8_magic_field";
+
+pub(crate) trait MagicType {
+ const NAME: &'static str;
+ const MAGIC_NAME: &'static str;
+}
+
+pub(crate) trait ToV8 {
+ fn to_v8<'a>(
+ &self,
+ scope: &mut v8::HandleScope<'a>,
+ ) -> Result<v8::Local<'a, v8::Value>, crate::Error>;
+}
+
+pub(crate) trait FromV8: Sized {
+ fn from_v8(
+ scope: &mut v8::HandleScope,
+ value: v8::Local<v8::Value>,
+ ) -> Result<Self, crate::Error>;
+}
+
+pub(crate) fn magic_serialize<T, S>(
+ serializer: S,
+ x: &T,
+) -> Result<S::Ok, S::Error>
+where
+ S: serde::Serializer,
+ T: MagicType,
+{
+ use serde::ser::SerializeStruct;
+
+ let mut s = serializer.serialize_struct(T::MAGIC_NAME, 1)?;
+ let ptr = opaque_send(x);
+ s.serialize_field(MAGIC_FIELD, &ptr)?;
+ s.end()
+}
+
+pub(crate) fn magic_deserialize<'de, T, D>(
+ deserializer: D,
+) -> Result<T, D::Error>
+where
+ D: serde::Deserializer<'de>,
+ T: MagicType,
+{
+ struct ValueVisitor<T> {
+ p1: std::marker::PhantomData<T>,
+ }
+
+ impl<'de, T: MagicType> serde::de::Visitor<'de> for ValueVisitor<T> {
+ type Value = T;
+
+ fn expecting(
+ &self,
+ formatter: &mut std::fmt::Formatter,
+ ) -> std::fmt::Result {
+ formatter.write_str("a ")?;
+ formatter.write_str(T::NAME)
+ }
+
+ fn visit_u64<E>(self, ptr: u64) -> Result<Self::Value, E>
+ where
+ E: serde::de::Error,
+ {
+ // SAFETY: opaque ptr originates from visit_magic, which forgets ownership so we can take it
+ Ok(unsafe { opaque_take(ptr) })
+ }
+ }
+
+ deserializer.deserialize_struct(
+ T::MAGIC_NAME,
+ &[MAGIC_FIELD],
+ ValueVisitor::<T> {
+ p1: std::marker::PhantomData,
+ },
+ )
+}
+
+pub(crate) fn visit_magic<'de, T, V, E>(visitor: V, x: T) -> Result<V::Value, E>
+where
+ V: serde::de::Visitor<'de>,
+ E: serde::de::Error,
+{
+ let y = visitor.visit_u64::<E>(opaque_send(&x));
+ std::mem::forget(x);
+ y
+}
+
+/// Constructs an "opaque" ptr from a reference to transerialize
+pub(crate) fn opaque_send<T: Sized>(x: &T) -> u64 {
+ (x as *const T) as u64
+}
+
+/// Copies an "opaque" ptr from a reference to an opaque ptr (transerialized)
+/// NOTE: ptr-to-ptr, extra indirection
+pub(crate) unsafe fn opaque_recv<T: ?Sized>(ptr: &T) -> u64 {
+ *(ptr as *const T as *const u64)
+}
+
+/// Transmutes an "opaque" ptr back into a reference
+pub(crate) unsafe fn opaque_deref<'a, T>(ptr: u64) -> &'a T {
+ std::mem::transmute(ptr)
+}
+
+/// Transmutes & copies the value from the "opaque" ptr
+/// NOTE: takes ownership & requires other end to forget its ownership
+pub(crate) unsafe fn opaque_take<T>(ptr: u64) -> T {
+ std::mem::transmute_copy::<T, T>(std::mem::transmute(ptr))
+}
+
+macro_rules! impl_magic {
+ ($t:ty) => {
+ impl crate::magic::transl8::MagicType for $t {
+ const NAME: &'static str = stringify!($t);
+ const MAGIC_NAME: &'static str = concat!("$__v8_magic_", stringify!($t));
+ }
+
+ impl serde::Serialize for $t {
+ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+ where
+ S: serde::Serializer,
+ {
+ crate::magic::transl8::magic_serialize(serializer, self)
+ }
+ }
+
+ impl<'de> serde::Deserialize<'de> for $t {
+ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+ where
+ D: serde::Deserializer<'de>,
+ {
+ crate::magic::transl8::magic_deserialize(deserializer)
+ }
+ }
+ };
+}
+pub(crate) use impl_magic;
diff --git a/serde_v8/magic/u16string.rs b/serde_v8/magic/u16string.rs
new file mode 100644
index 000000000..39ebf88d9
--- /dev/null
+++ b/serde_v8/magic/u16string.rs
@@ -0,0 +1,83 @@
+use crate::magic::transl8::impl_magic;
+use crate::Error;
+use std::ops::{Deref, DerefMut};
+
+use super::transl8::{FromV8, ToV8};
+
+#[derive(Default, PartialEq, Eq, Debug)]
+pub struct U16String(pub Vec<u16>);
+impl_magic!(U16String);
+
+impl U16String {
+ pub fn with_zeroes(length: usize) -> U16String {
+ U16String(vec![0u16; length])
+ }
+
+ pub fn truncate(&mut self, new_length: usize) {
+ self.0.truncate(new_length);
+ self.0.shrink_to_fit()
+ }
+}
+
+impl Deref for U16String {
+ type Target = [u16];
+ fn deref(&self) -> &[u16] {
+ self.0.deref()
+ }
+}
+
+impl DerefMut for U16String {
+ fn deref_mut(&mut self) -> &mut [u16] {
+ self.0.deref_mut()
+ }
+}
+
+impl AsRef<[u16]> for U16String {
+ fn as_ref(&self) -> &[u16] {
+ self.0.as_ref()
+ }
+}
+
+impl AsMut<[u16]> for U16String {
+ fn as_mut(&mut self) -> &mut [u16] {
+ self.0.as_mut()
+ }
+}
+
+impl ToV8 for U16String {
+ fn to_v8<'a>(
+ &self,
+ scope: &mut v8::HandleScope<'a>,
+ ) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
+ let v =
+ v8::String::new_from_two_byte(scope, self, v8::NewStringType::Normal)
+ .unwrap();
+ Ok(v.into())
+ }
+}
+
+impl FromV8 for U16String {
+ fn from_v8(
+ scope: &mut v8::HandleScope,
+ value: v8::Local<v8::Value>,
+ ) -> Result<Self, crate::Error> {
+ let v8str = v8::Local::<v8::String>::try_from(value)
+ .map_err(|_| Error::ExpectedString)?;
+ let len = v8str.length();
+ let mut buffer = Vec::with_capacity(len);
+ // SAFETY: we set length == capacity (see previous line),
+ // before immediately writing into that buffer and sanity check with an assert
+ #[allow(clippy::uninit_vec)]
+ unsafe {
+ buffer.set_len(len);
+ let written = v8str.write(
+ scope,
+ &mut buffer,
+ 0,
+ v8::WriteOptions::NO_NULL_TERMINATION,
+ );
+ assert!(written == len);
+ }
+ Ok(U16String(buffer))
+ }
+}
diff --git a/serde_v8/magic/value.rs b/serde_v8/magic/value.rs
new file mode 100644
index 000000000..5d844fbda
--- /dev/null
+++ b/serde_v8/magic/value.rs
@@ -0,0 +1,48 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use crate::magic::transl8::impl_magic;
+use crate::magic::transl8::FromV8;
+use crate::magic::transl8::ToV8;
+use std::mem::transmute;
+
+/// serde_v8::Value allows passing through `v8::Value`s untouched
+/// when de/serializing & allows mixing rust & v8 values in structs, tuples...
+//
+// SAFETY: caveat emptor, the rust-compiler can no longer link lifetimes to their
+// original scope, you must take special care in ensuring your handles don't outlive their scope
+pub struct Value<'s> {
+ pub v8_value: v8::Local<'s, v8::Value>,
+}
+impl_magic!(Value<'_>);
+
+impl<'s> From<v8::Local<'s, v8::Value>> for Value<'s> {
+ fn from(v8_value: v8::Local<'s, v8::Value>) -> Self {
+ Self { v8_value }
+ }
+}
+
+impl<'s> From<Value<'s>> for v8::Local<'s, v8::Value> {
+ fn from(v: Value<'s>) -> Self {
+ v.v8_value
+ }
+}
+
+impl ToV8 for Value<'_> {
+ fn to_v8<'a>(
+ &self,
+ _scope: &mut v8::HandleScope<'a>,
+ ) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
+ // SAFETY: not fully safe, since lifetimes are detached from original scope
+ Ok(unsafe { transmute(self.v8_value) })
+ }
+}
+
+impl FromV8 for Value<'_> {
+ fn from_v8(
+ _scope: &mut v8::HandleScope,
+ value: v8::Local<v8::Value>,
+ ) -> Result<Self, crate::Error> {
+ // SAFETY: not fully safe, since lifetimes are detached from original scope
+ Ok(unsafe { transmute::<Value, Value>(value.into()) })
+ }
+}
diff --git a/serde_v8/magic/zero_copy_buf.rs b/serde_v8/magic/zero_copy_buf.rs
new file mode 100644
index 000000000..c63d4ba66
--- /dev/null
+++ b/serde_v8/magic/zero_copy_buf.rs
@@ -0,0 +1,136 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use std::cell::Cell;
+use std::ops::Deref;
+use std::ops::DerefMut;
+
+use super::transl8::FromV8;
+
+/// A ZeroCopyBuf encapsulates a slice that's been borrowed from a JavaScript
+/// ArrayBuffer object. JavaScript objects can normally be garbage collected,
+/// but the existence of a ZeroCopyBuf inhibits this until it is dropped. It
+/// behaves much like an Arc<[u8]>.
+///
+/// # Cloning
+/// Cloning a ZeroCopyBuf does not clone the contents of the buffer,
+/// it creates a new reference to that buffer.
+///
+/// To actually clone the contents of the buffer do
+/// `let copy = Vec::from(&*zero_copy_buf);`
+#[derive(Clone)]
+pub struct ZeroCopyBuf {
+ backing_store: v8::SharedRef<v8::BackingStore>,
+ byte_offset: usize,
+ byte_length: usize,
+}
+
+unsafe impl Send for ZeroCopyBuf {}
+
+impl ZeroCopyBuf {
+ pub fn from_buffer(
+ buffer: v8::Local<v8::ArrayBuffer>,
+ byte_offset: usize,
+ byte_length: usize,
+ ) -> Result<Self, v8::DataError> {
+ let backing_store = buffer.get_backing_store();
+ match backing_store.is_shared() {
+ true => Err(v8::DataError::BadType {
+ actual: "shared ArrayBufferView",
+ expected: "non-shared ArrayBufferView",
+ }),
+ false => Ok(Self {
+ backing_store,
+ byte_offset,
+ byte_length,
+ }),
+ }
+ }
+
+ pub fn from_view(
+ scope: &mut v8::HandleScope,
+ view: v8::Local<v8::ArrayBufferView>,
+ ) -> Result<Self, v8::DataError> {
+ let buffer = view.buffer(scope).ok_or(v8::DataError::NoData {
+ expected: "view to have a buffer",
+ })?;
+ Self::from_buffer(buffer, view.byte_offset(), view.byte_length())
+ }
+}
+
+impl FromV8 for ZeroCopyBuf {
+ fn from_v8(
+ scope: &mut v8::HandleScope,
+ value: v8::Local<v8::Value>,
+ ) -> Result<Self, crate::Error> {
+ if value.is_array_buffer() {
+ value
+ .try_into()
+ .and_then(|b| Self::from_buffer(b, 0, b.byte_length()))
+ } else {
+ value
+ .try_into()
+ .and_then(|view| Self::from_view(scope, view))
+ }
+ .map_err(|_| crate::Error::ExpectedBuffer)
+ }
+}
+
+impl Deref for ZeroCopyBuf {
+ type Target = [u8];
+ fn deref(&self) -> &[u8] {
+ unsafe {
+ get_backing_store_slice(
+ &self.backing_store,
+ self.byte_offset,
+ self.byte_length,
+ )
+ }
+ }
+}
+
+impl DerefMut for ZeroCopyBuf {
+ fn deref_mut(&mut self) -> &mut [u8] {
+ unsafe {
+ get_backing_store_slice_mut(
+ &self.backing_store,
+ self.byte_offset,
+ self.byte_length,
+ )
+ }
+ }
+}
+
+impl AsRef<[u8]> for ZeroCopyBuf {
+ fn as_ref(&self) -> &[u8] {
+ &*self
+ }
+}
+
+impl AsMut<[u8]> for ZeroCopyBuf {
+ fn as_mut(&mut self) -> &mut [u8] {
+ &mut *self
+ }
+}
+
+unsafe fn get_backing_store_slice(
+ backing_store: &v8::SharedRef<v8::BackingStore>,
+ byte_offset: usize,
+ byte_length: usize,
+) -> &[u8] {
+ let cells: *const [Cell<u8>] =
+ &backing_store[byte_offset..byte_offset + byte_length];
+ let bytes = cells as *const [u8];
+ &*bytes
+}
+
+#[allow(clippy::mut_from_ref)]
+unsafe fn get_backing_store_slice_mut(
+ backing_store: &v8::SharedRef<v8::BackingStore>,
+ byte_offset: usize,
+ byte_length: usize,
+) -> &mut [u8] {
+ let cells: *const [Cell<u8>] =
+ &backing_store[byte_offset..byte_offset + byte_length];
+ let bytes = cells as *const _ as *mut [u8];
+ &mut *bytes
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-30 14:32:15 +0000