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-rw-r--r--js/rust/src/rust.rs1312
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diff --git a/js/rust/src/rust.rs b/js/rust/src/rust.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! Rust wrappers around the raw JS apis
+
+use ar::AutoRealm;
+use glue::{
+ AppendToRootedObjectVector, CreateCallArgsFromVp, CreateRootedObjectVector,
+ DeleteRootedObjectVector, IsDebugBuild,
+};
+use glue::{
+ CreateRootedIdVector, DestroyRootedIdVector, GetMutableHandleIdVector, SliceRootedIdVector,
+};
+use glue::{DeleteCompileOptions, NewCompileOptions};
+use jsapi::root::*;
+use jsval::{self, UndefinedValue};
+use libc::c_uint;
+use panic;
+use std::cell::{Cell, UnsafeCell};
+use std::char;
+use std::default::Default;
+use std::ffi;
+use std::marker;
+use std::mem;
+use std::ops::{Deref, DerefMut};
+use std::ptr;
+use std::slice;
+use std::sync::atomic::{AtomicBool, AtomicPtr, AtomicUsize, Ordering};
+use std::sync::mpsc::{sync_channel, SyncSender};
+use std::sync::{Arc, Mutex, Once, ONCE_INIT};
+use std::thread;
+use std::u32;
+
+const DEFAULT_HEAPSIZE: u32 = 32_u32 * 1024_u32 * 1024_u32;
+
+// From Gecko:
+// Our "default" stack is what we use in configurations where we don't have a compelling reason to
+// do things differently. This is effectively 1MB on 64-bit platforms.
+const STACK_QUOTA: usize = 128 * 8 * 1024;
+
+// From Gecko:
+// (See js/xpconnect/src/XPCJSContext.cpp)
+// We tune the trusted/untrusted quotas for each configuration to achieve our
+// invariants while attempting to minimize overhead. In contrast, our buffer
+// between system code and trusted script is a very unscientific 10k.
+const SYSTEM_CODE_BUFFER: usize = 10 * 1024;
+
+// Gecko's value on 64-bit.
+const TRUSTED_SCRIPT_BUFFER: usize = 8 * 12800;
+
+trait ToResult {
+ fn to_result(self) -> Result<(), ()>;
+}
+
+impl ToResult for bool {
+ fn to_result(self) -> Result<(), ()> {
+ if self {
+ Ok(())
+ } else {
+ Err(())
+ }
+ }
+}
+
+// ___________________________________________________________________________
+// friendly Rustic API to runtimes
+
+thread_local!(static CONTEXT: Cell<*mut JSContext> = Cell::new(ptr::null_mut()));
+
+lazy_static! {
+ static ref OUTSTANDING_RUNTIMES: AtomicUsize = AtomicUsize::new(0);
+ static ref SHUT_DOWN: AtomicBool = AtomicBool::new(false);
+ static ref SHUT_DOWN_SIGNAL: Arc<Mutex<Option<SyncSender<()>>>> = Arc::new(Mutex::new(None));
+}
+
+/// A wrapper for the `JSContext` structure in SpiderMonkey.
+pub struct Runtime {
+ cx: *mut JSContext,
+}
+
+impl Runtime {
+ /// Get the `JSContext` for this thread.
+ pub fn get() -> *mut JSContext {
+ let cx = CONTEXT.with(|context| context.get());
+ assert!(!cx.is_null());
+ cx
+ }
+
+ /// Creates a new `JSContext`.
+ ///
+ /// * `use_internal_job_queue`: If `true`, then SpiderMonkey's internal
+ /// micro-task job queue is used. If `false`, then it is up to you to
+ /// implement micro-tasks yourself.
+ pub fn new(use_internal_job_queue: bool) -> Result<Runtime, ()> {
+ if SHUT_DOWN.load(Ordering::SeqCst) {
+ return Err(());
+ }
+
+ OUTSTANDING_RUNTIMES.fetch_add(1, Ordering::SeqCst);
+
+ unsafe {
+ #[derive(Debug)]
+ struct Parent(UnsafeCell<*mut JSContext>);
+ unsafe impl ::std::marker::Sync for Parent {}
+
+ impl Parent {
+ fn set(&self, val: *mut JSContext) {
+ self.as_atomic().store(val, Ordering::SeqCst);
+ assert_eq!(self.get(), val);
+ }
+
+ fn get(&self) -> *mut JSContext {
+ self.as_atomic().load(Ordering::SeqCst)
+ }
+
+ fn as_atomic(&self) -> &AtomicPtr<JSContext> {
+ unsafe { mem::transmute(&self.0) }
+ }
+ }
+
+ lazy_static! {
+ static ref PARENT: Parent = Parent(UnsafeCell::new(0 as *mut _));
+ }
+ static ONCE: Once = ONCE_INIT;
+
+ ONCE.call_once(|| {
+ // There is a 1:1 relationship between threads and JSContexts,
+ // so we must spawn a new thread for the parent context.
+ let (tx, rx) = sync_channel(0);
+ *SHUT_DOWN_SIGNAL.lock().unwrap() = Some(tx);
+ let _ = thread::spawn(move || {
+ let is_debug_mozjs = cfg!(feature = "debugmozjs");
+ let diagnostic = JS::detail::InitWithFailureDiagnostic(is_debug_mozjs);
+ if !diagnostic.is_null() {
+ panic!(
+ "JS::detail::InitWithFailureDiagnostic failed: {}",
+ ffi::CStr::from_ptr(diagnostic).to_string_lossy()
+ );
+ }
+
+ let context = JS_NewContext(DEFAULT_HEAPSIZE, ptr::null_mut());
+ assert!(!context.is_null());
+ JS::InitSelfHostedCode(context);
+ PARENT.set(context);
+
+ // The last JSRuntime child died, resume the execution by destroying the parent.
+ rx.recv().unwrap();
+ let cx = PARENT.get();
+ JS_DestroyContext(cx);
+ JS_ShutDown();
+ PARENT.set(0 as *mut _);
+ // Unblock the last child thread, waiting for the JS_ShutDown.
+ rx.recv().unwrap();
+ });
+
+ while PARENT.get().is_null() {
+ thread::yield_now();
+ }
+ });
+
+ assert_eq!(IsDebugBuild(), cfg!(feature = "debugmozjs"));
+
+ let js_context = JS_NewContext(DEFAULT_HEAPSIZE, JS_GetParentRuntime(PARENT.get()));
+ assert!(!js_context.is_null());
+
+ // Unconstrain the runtime's threshold on nominal heap size, to avoid
+ // triggering GC too often if operating continuously near an arbitrary
+ // finite threshold. This leaves the maximum-JS_malloc-bytes threshold
+ // still in effect to cause periodical, and we hope hygienic,
+ // last-ditch GCs from within the GC's allocator.
+ JS_SetGCParameter(js_context, JSGCParamKey::JSGC_MAX_BYTES, u32::MAX);
+
+ JS_SetNativeStackQuota(
+ js_context,
+ STACK_QUOTA,
+ STACK_QUOTA - SYSTEM_CODE_BUFFER,
+ STACK_QUOTA - SYSTEM_CODE_BUFFER - TRUSTED_SCRIPT_BUFFER,
+ );
+
+ CONTEXT.with(|context| {
+ assert!(context.get().is_null());
+ context.set(js_context);
+ });
+
+ if use_internal_job_queue {
+ assert!(js::UseInternalJobQueues(js_context));
+ }
+
+ JS::InitSelfHostedCode(js_context);
+
+ JS::SetWarningReporter(js_context, Some(report_warning));
+
+ Ok(Runtime { cx: js_context })
+ }
+ }
+
+ /// Returns the underlying `JSContext` object.
+ pub fn cx(&self) -> *mut JSContext {
+ self.cx
+ }
+
+ /// Returns the underlying `JSContext`'s `JSRuntime`.
+ pub fn rt(&self) -> *mut JSRuntime {
+ unsafe { JS_GetRuntime(self.cx) }
+ }
+
+ pub fn evaluate_script(
+ &self,
+ glob: JS::HandleObject,
+ script: &str,
+ filename: &str,
+ line_num: u32,
+ rval: JS::MutableHandleValue,
+ ) -> Result<(), ()> {
+ let script_utf16: Vec<u16> = script.encode_utf16().collect();
+ let filename_cstr = ffi::CString::new(filename.as_bytes()).unwrap();
+ debug!(
+ "Evaluating script from {} with content {}",
+ filename, script
+ );
+ // SpiderMonkey does not approve of null pointers.
+ let (ptr, len) = if script_utf16.len() == 0 {
+ static empty: &'static [u16] = &[];
+ (empty.as_ptr(), 0)
+ } else {
+ (script_utf16.as_ptr(), script_utf16.len() as c_uint)
+ };
+ assert!(!ptr.is_null());
+ unsafe {
+ let _ar = AutoRealm::with_obj(self.cx(), glob.get());
+ let options = CompileOptionsWrapper::new(self.cx(), filename_cstr.as_ptr(), line_num);
+
+ let mut srcBuf = JS::SourceText {
+ units_: ptr,
+ length_: len as _,
+ ownsUnits_: false,
+ _phantom_0: marker::PhantomData,
+ };
+ if !JS::Evaluate(self.cx(), options.ptr, &mut srcBuf, rval) {
+ debug!("...err!");
+ panic::maybe_resume_unwind();
+ Err(())
+ } else {
+ // we could return the script result but then we'd have
+ // to root it and so forth and, really, who cares?
+ debug!("...ok!");
+ Ok(())
+ }
+ }
+ }
+}
+
+impl Drop for Runtime {
+ fn drop(&mut self) {
+ unsafe {
+ JS_DestroyContext(self.cx);
+
+ CONTEXT.with(|context| {
+ assert_eq!(context.get(), self.cx);
+ context.set(ptr::null_mut());
+ });
+
+ if OUTSTANDING_RUNTIMES.fetch_sub(1, Ordering::SeqCst) == 1 {
+ SHUT_DOWN.store(true, Ordering::SeqCst);
+ let signal = &SHUT_DOWN_SIGNAL.lock().unwrap();
+ let signal = signal.as_ref().unwrap();
+ // Send a signal to shutdown the Parent runtime.
+ signal.send(()).unwrap();
+ // Wait for it to be destroyed before resuming the execution
+ // of static variable destructors.
+ signal.send(()).unwrap();
+ }
+ }
+ }
+}
+
+// ___________________________________________________________________________
+// Rooting API for standard JS things
+
+pub trait RootKind {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind;
+}
+
+impl RootKind for *mut JSObject {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::Object
+ }
+}
+
+impl RootKind for *mut JSLinearString {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::String
+ }
+}
+
+impl RootKind for *mut JSFunction {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::Object
+ }
+}
+
+impl RootKind for *mut JSString {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::String
+ }
+}
+
+impl RootKind for *mut JS::Symbol {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::Symbol
+ }
+}
+
+#[cfg(feature = "bigint")]
+impl RootKind for *mut JS::BigInt {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::BigInt
+ }
+}
+
+impl RootKind for *mut JSScript {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::Script
+ }
+}
+
+impl RootKind for jsid {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::Id
+ }
+}
+
+impl RootKind for JS::Value {
+ #[inline(always)]
+ fn rootKind() -> JS::RootKind {
+ JS::RootKind::Value
+ }
+}
+
+impl<T> JS::Rooted<T> {
+ pub fn new_unrooted() -> JS::Rooted<T>
+ where
+ T: GCMethods,
+ {
+ JS::Rooted {
+ stack: ptr::null_mut(),
+ prev: ptr::null_mut(),
+ ptr: unsafe { T::initial() },
+ _phantom_0: marker::PhantomData,
+ }
+ }
+
+ unsafe fn get_rooting_context(cx: *mut JSContext) -> *mut JS::RootingContext {
+ mem::transmute(cx)
+ }
+
+ unsafe fn get_root_stack(
+ cx: *mut JSContext,
+ ) -> *mut *mut JS::Rooted<*mut JS::detail::RootListEntry>
+ where
+ T: RootKind,
+ {
+ let kind = T::rootKind() as usize;
+ let rooting_cx = Self::get_rooting_context(cx);
+ &mut rooting_cx.as_mut().unwrap().stackRoots_[kind] as *mut _ as *mut _
+ }
+
+ pub unsafe fn register_with_root_lists(&mut self, cx: *mut JSContext)
+ where
+ T: RootKind,
+ {
+ self.stack = Self::get_root_stack(cx);
+ let stack = self.stack.as_mut().unwrap();
+ self.prev = *stack as *mut _;
+
+ *stack = self as *mut _ as usize as _;
+ }
+
+ pub unsafe fn remove_from_root_stack(&mut self) {
+ assert!(*self.stack == self as *mut _ as usize as _);
+ *self.stack = self.prev;
+ }
+}
+
+/// Rust API for keeping a JS::Rooted value in the context's root stack.
+/// Example usage: `rooted!(in(cx) let x = UndefinedValue());`.
+/// `RootedGuard::new` also works, but the macro is preferred.
+pub struct RootedGuard<'a, T: 'a + RootKind + GCMethods> {
+ root: &'a mut JS::Rooted<T>,
+}
+
+impl<'a, T: 'a + RootKind + GCMethods> RootedGuard<'a, T> {
+ pub fn new(cx: *mut JSContext, root: &'a mut JS::Rooted<T>, initial: T) -> Self {
+ root.ptr = initial;
+ unsafe {
+ root.register_with_root_lists(cx);
+ }
+ RootedGuard { root: root }
+ }
+
+ pub fn handle(&self) -> JS::Handle<T> {
+ unsafe { JS::Handle::from_marked_location(&self.root.ptr) }
+ }
+
+ pub fn handle_mut(&mut self) -> JS::MutableHandle<T> {
+ unsafe { JS::MutableHandle::from_marked_location(&mut self.root.ptr) }
+ }
+
+ pub fn get(&self) -> T
+ where
+ T: Copy,
+ {
+ self.root.ptr
+ }
+
+ pub fn set(&mut self, v: T) {
+ self.root.ptr = v;
+ }
+}
+
+impl<'a, T: 'a + RootKind + GCMethods> Deref for RootedGuard<'a, T> {
+ type Target = T;
+ fn deref(&self) -> &T {
+ &self.root.ptr
+ }
+}
+
+impl<'a, T: 'a + RootKind + GCMethods> DerefMut for RootedGuard<'a, T> {
+ fn deref_mut(&mut self) -> &mut T {
+ &mut self.root.ptr
+ }
+}
+
+impl<'a, T: 'a + RootKind + GCMethods> Drop for RootedGuard<'a, T> {
+ fn drop(&mut self) {
+ unsafe {
+ self.root.ptr = T::initial();
+ self.root.remove_from_root_stack();
+ }
+ }
+}
+
+#[macro_export]
+macro_rules! rooted {
+ (in($cx:expr) let $name:ident = $init:expr) => {
+ let mut __root = $crate::jsapi::JS::Rooted::new_unrooted();
+ let $name = $crate::rust::RootedGuard::new($cx, &mut __root, $init);
+ };
+ (in($cx:expr) let mut $name:ident = $init:expr) => {
+ let mut __root = $crate::jsapi::JS::Rooted::new_unrooted();
+ let mut $name = $crate::rust::RootedGuard::new($cx, &mut __root, $init);
+ };
+}
+
+impl<T> JS::Handle<T> {
+ pub fn get(&self) -> T
+ where
+ T: Copy,
+ {
+ unsafe { *self.ptr }
+ }
+
+ pub unsafe fn from_marked_location(ptr: *const T) -> JS::Handle<T> {
+ JS::Handle {
+ ptr: mem::transmute(ptr),
+ _phantom_0: marker::PhantomData,
+ }
+ }
+}
+
+impl<T> Deref for JS::Handle<T> {
+ type Target = T;
+
+ fn deref<'a>(&'a self) -> &'a T {
+ unsafe { &*self.ptr }
+ }
+}
+
+impl<T> JS::MutableHandle<T> {
+ pub unsafe fn from_marked_location(ptr: *mut T) -> JS::MutableHandle<T> {
+ JS::MutableHandle {
+ ptr: ptr,
+ _phantom_0: marker::PhantomData,
+ }
+ }
+
+ pub fn handle(&self) -> JS::Handle<T> {
+ unsafe { JS::Handle::from_marked_location(self.ptr as *const _) }
+ }
+
+ pub fn get(&self) -> T
+ where
+ T: Copy,
+ {
+ unsafe { *self.ptr }
+ }
+
+ pub fn set(&self, v: T)
+ where
+ T: Copy,
+ {
+ unsafe { *self.ptr = v }
+ }
+}
+
+impl<T> Deref for JS::MutableHandle<T> {
+ type Target = T;
+
+ fn deref<'a>(&'a self) -> &'a T {
+ unsafe { &*self.ptr }
+ }
+}
+
+impl<T> DerefMut for JS::MutableHandle<T> {
+ fn deref_mut<'a>(&'a mut self) -> &'a mut T {
+ unsafe { &mut *self.ptr }
+ }
+}
+
+impl JS::HandleValue {
+ pub fn null() -> JS::HandleValue {
+ unsafe { JS::NullHandleValue }
+ }
+
+ pub fn undefined() -> JS::HandleValue {
+ unsafe { JS::UndefinedHandleValue }
+ }
+}
+
+impl JS::HandleValueArray {
+ pub fn new() -> JS::HandleValueArray {
+ JS::HandleValueArray {
+ length_: 0,
+ elements_: ptr::null(),
+ }
+ }
+
+ pub unsafe fn from_rooted_slice(values: &[JS::Value]) -> JS::HandleValueArray {
+ JS::HandleValueArray {
+ length_: values.len(),
+ elements_: values.as_ptr(),
+ }
+ }
+}
+
+const ConstNullValue: *mut JSObject = 0 as *mut JSObject;
+
+impl JS::HandleObject {
+ pub fn null() -> JS::HandleObject {
+ unsafe { JS::HandleObject::from_marked_location(&ConstNullValue) }
+ }
+}
+
+impl Default for jsid {
+ fn default() -> jsid {
+ jsid {
+ asBits: JSID_TYPE_VOID as usize,
+ }
+ }
+}
+
+impl Default for JS::Value {
+ fn default() -> JS::Value {
+ jsval::UndefinedValue()
+ }
+}
+
+impl Default for JS::RealmOptions {
+ fn default() -> Self {
+ unsafe { ::std::mem::zeroed() }
+ }
+}
+
+pub trait GCMethods {
+ unsafe fn initial() -> Self;
+ unsafe fn write_barriers(v: *mut Self, prev: Self, next: Self);
+}
+
+impl GCMethods for jsid {
+ unsafe fn initial() -> jsid {
+ Default::default()
+ }
+ unsafe fn write_barriers(_: *mut jsid, _: jsid, _: jsid) {}
+}
+
+#[cfg(feature = "bigint")]
+impl GCMethods for *mut JS::BigInt {
+ unsafe fn initial() -> *mut JS::BigInt {
+ ptr::null_mut()
+ }
+ unsafe fn write_barriers(
+ v: *mut *mut JS::BigInt,
+ prev: *mut JS::BigInt,
+ next: *mut JS::BigInt,
+ ) {
+ JS::HeapBigIntWriteBarriers(v, prev, next);
+ }
+}
+
+impl GCMethods for *mut JSObject {
+ unsafe fn initial() -> *mut JSObject {
+ ptr::null_mut()
+ }
+ unsafe fn write_barriers(v: *mut *mut JSObject, prev: *mut JSObject, next: *mut JSObject) {
+ JS::HeapObjectWriteBarriers(v, prev, next);
+ }
+}
+
+impl GCMethods for *mut JSString {
+ unsafe fn initial() -> *mut JSString {
+ ptr::null_mut()
+ }
+ unsafe fn write_barriers(v: *mut *mut JSString, prev: *mut JSString, next: *mut JSString) {
+ JS::HeapStringWriteBarriers(v, prev, next);
+ }
+}
+
+impl GCMethods for *mut JSScript {
+ unsafe fn initial() -> *mut JSScript {
+ ptr::null_mut()
+ }
+ unsafe fn write_barriers(v: *mut *mut JSScript, prev: *mut JSScript, next: *mut JSScript) {
+ JS::HeapScriptWriteBarriers(v, prev, next);
+ }
+}
+
+impl GCMethods for *mut JSFunction {
+ unsafe fn initial() -> *mut JSFunction {
+ ptr::null_mut()
+ }
+ unsafe fn write_barriers(
+ v: *mut *mut JSFunction,
+ prev: *mut JSFunction,
+ next: *mut JSFunction,
+ ) {
+ JS::HeapObjectWriteBarriers(
+ mem::transmute(v),
+ mem::transmute(prev),
+ mem::transmute(next),
+ );
+ }
+}
+
+impl GCMethods for JS::Value {
+ unsafe fn initial() -> JS::Value {
+ UndefinedValue()
+ }
+ unsafe fn write_barriers(v: *mut JS::Value, prev: JS::Value, next: JS::Value) {
+ JS::HeapValueWriteBarriers(v, &prev, &next);
+ }
+}
+
+// ___________________________________________________________________________
+// Implementations for various things in jsapi.rs
+
+impl Drop for JSAutoRealm {
+ fn drop(&mut self) {
+ unsafe {
+ JS::LeaveRealm(self.cx_, self.oldRealm_);
+ }
+ }
+}
+
+impl JSJitMethodCallArgs {
+ #[inline]
+ pub fn get(&self, i: u32) -> JS::HandleValue {
+ unsafe {
+ if i < self._base.argc_ {
+ JS::HandleValue::from_marked_location(self._base.argv_.offset(i as isize))
+ } else {
+ JS::UndefinedHandleValue
+ }
+ }
+ }
+
+ #[inline]
+ pub fn index(&self, i: u32) -> JS::HandleValue {
+ assert!(i < self._base.argc_);
+ unsafe { JS::HandleValue::from_marked_location(self._base.argv_.offset(i as isize)) }
+ }
+
+ #[inline]
+ pub fn index_mut(&self, i: u32) -> JS::MutableHandleValue {
+ assert!(i < self._base.argc_);
+ unsafe { JS::MutableHandleValue::from_marked_location(self._base.argv_.offset(i as isize)) }
+ }
+
+ #[inline]
+ pub fn rval(&self) -> JS::MutableHandleValue {
+ unsafe { JS::MutableHandleValue::from_marked_location(self._base.argv_.offset(-2)) }
+ }
+}
+
+// XXX need to hack up bindgen to convert this better so we don't have
+// to duplicate so much code here
+impl JS::CallArgs {
+ #[inline]
+ pub unsafe fn from_vp(vp: *mut JS::Value, argc: u32) -> JS::CallArgs {
+ CreateCallArgsFromVp(argc, vp)
+ }
+
+ #[inline]
+ pub fn index(&self, i: u32) -> JS::HandleValue {
+ assert!(i < self._base.argc_);
+ unsafe { JS::HandleValue::from_marked_location(self._base.argv_.offset(i as isize)) }
+ }
+
+ #[inline]
+ pub fn index_mut(&self, i: u32) -> JS::MutableHandleValue {
+ assert!(i < self._base.argc_);
+ unsafe { JS::MutableHandleValue::from_marked_location(self._base.argv_.offset(i as isize)) }
+ }
+
+ #[inline]
+ pub fn get(&self, i: u32) -> JS::HandleValue {
+ unsafe {
+ if i < self._base.argc_ {
+ JS::HandleValue::from_marked_location(self._base.argv_.offset(i as isize))
+ } else {
+ JS::UndefinedHandleValue
+ }
+ }
+ }
+
+ #[inline]
+ pub fn rval(&self) -> JS::MutableHandleValue {
+ unsafe { JS::MutableHandleValue::from_marked_location(self._base.argv_.offset(-2)) }
+ }
+
+ #[inline]
+ pub fn thisv(&self) -> JS::HandleValue {
+ unsafe { JS::HandleValue::from_marked_location(self._base.argv_.offset(-1)) }
+ }
+
+ #[inline]
+ pub fn calleev(&self) -> JS::HandleValue {
+ unsafe { JS::HandleValue::from_marked_location(self._base.argv_.offset(-2)) }
+ }
+
+ #[inline]
+ pub fn callee(&self) -> *mut JSObject {
+ self.calleev().to_object()
+ }
+
+ #[inline]
+ pub fn new_target(&self) -> JS::MutableHandleValue {
+ assert!(self._base.constructing_());
+ unsafe {
+ JS::MutableHandleValue::from_marked_location(
+ self._base.argv_.offset(self._base.argc_ as isize),
+ )
+ }
+ }
+}
+
+impl JSJitGetterCallArgs {
+ #[inline]
+ pub fn rval(&self) -> JS::MutableHandleValue {
+ self._base
+ }
+}
+
+impl JSJitSetterCallArgs {
+ #[inline]
+ pub fn get(&self, i: u32) -> JS::HandleValue {
+ assert!(i == 0);
+ self._base.handle()
+ }
+}
+
+// ___________________________________________________________________________
+// Wrappers around things in jsglue.cpp
+
+pub struct RootedObjectVectorWrapper {
+ pub ptr: *mut JS::PersistentRootedObjectVector,
+}
+
+impl RootedObjectVectorWrapper {
+ pub fn new(cx: *mut JSContext) -> RootedObjectVectorWrapper {
+ RootedObjectVectorWrapper {
+ ptr: unsafe { CreateRootedObjectVector(cx) },
+ }
+ }
+
+ pub fn append(&self, obj: *mut JSObject) -> bool {
+ unsafe { AppendToRootedObjectVector(self.ptr, obj) }
+ }
+}
+
+impl Drop for RootedObjectVectorWrapper {
+ fn drop(&mut self) {
+ unsafe { DeleteRootedObjectVector(self.ptr) }
+ }
+}
+
+pub struct CompileOptionsWrapper {
+ pub ptr: *mut JS::ReadOnlyCompileOptions,
+}
+
+impl CompileOptionsWrapper {
+ pub fn new(
+ cx: *mut JSContext,
+ file: *const ::libc::c_char,
+ line: c_uint,
+ ) -> CompileOptionsWrapper {
+ CompileOptionsWrapper {
+ ptr: unsafe { NewCompileOptions(cx, file, line) },
+ }
+ }
+}
+
+impl Drop for CompileOptionsWrapper {
+ fn drop(&mut self) {
+ unsafe { DeleteCompileOptions(self.ptr) }
+ }
+}
+
+// ___________________________________________________________________________
+// Fast inline converters
+
+#[inline]
+pub unsafe fn ToBoolean(v: JS::HandleValue) -> bool {
+ let val = *v.ptr;
+
+ if val.is_boolean() {
+ return val.to_boolean();
+ }
+
+ if val.is_int32() {
+ return val.to_int32() != 0;
+ }
+
+ if val.is_null_or_undefined() {
+ return false;
+ }
+
+ if val.is_double() {
+ let d = val.to_double();
+ return !d.is_nan() && d != 0f64;
+ }
+
+ if val.is_symbol() {
+ return true;
+ }
+
+ js::ToBooleanSlow(v)
+}
+
+#[inline]
+pub unsafe fn ToNumber(cx: *mut JSContext, v: JS::HandleValue) -> Result<f64, ()> {
+ let val = *v.ptr;
+ if val.is_number() {
+ return Ok(val.to_number());
+ }
+
+ let mut out = Default::default();
+ if js::ToNumberSlow(cx, v, &mut out) {
+ Ok(out)
+ } else {
+ Err(())
+ }
+}
+
+#[inline]
+unsafe fn convert_from_int32<T: Default + Copy>(
+ cx: *mut JSContext,
+ v: JS::HandleValue,
+ conv_fn: unsafe extern "C" fn(*mut JSContext, JS::HandleValue, *mut T) -> bool,
+) -> Result<T, ()> {
+ let val = *v.ptr;
+ if val.is_int32() {
+ let intval: i64 = val.to_int32() as i64;
+ // TODO: do something better here that works on big endian
+ let intval = *(&intval as *const i64 as *const T);
+ return Ok(intval);
+ }
+
+ let mut out = Default::default();
+ if conv_fn(cx, v, &mut out) {
+ Ok(out)
+ } else {
+ Err(())
+ }
+}
+
+#[inline]
+pub unsafe fn ToInt32(cx: *mut JSContext, v: JS::HandleValue) -> Result<i32, ()> {
+ convert_from_int32::<i32>(cx, v, js::ToInt32Slow)
+}
+
+#[inline]
+pub unsafe fn ToUint32(cx: *mut JSContext, v: JS::HandleValue) -> Result<u32, ()> {
+ convert_from_int32::<u32>(cx, v, js::ToUint32Slow)
+}
+
+#[inline]
+pub unsafe fn ToUint16(cx: *mut JSContext, v: JS::HandleValue) -> Result<u16, ()> {
+ convert_from_int32::<u16>(cx, v, js::ToUint16Slow)
+}
+
+#[inline]
+pub unsafe fn ToInt64(cx: *mut JSContext, v: JS::HandleValue) -> Result<i64, ()> {
+ convert_from_int32::<i64>(cx, v, js::ToInt64Slow)
+}
+
+#[inline]
+pub unsafe fn ToUint64(cx: *mut JSContext, v: JS::HandleValue) -> Result<u64, ()> {
+ convert_from_int32::<u64>(cx, v, js::ToUint64Slow)
+}
+
+#[inline]
+pub unsafe fn ToString(cx: *mut JSContext, v: JS::HandleValue) -> *mut JSString {
+ let val = *v.ptr;
+ if val.is_string() {
+ return val.to_string();
+ }
+
+ js::ToStringSlow(cx, v)
+}
+
+pub unsafe extern "C" fn report_warning(_cx: *mut JSContext, report: *mut JSErrorReport) {
+ fn latin1_to_string(bytes: &[u8]) -> String {
+ bytes
+ .iter()
+ .map(|c| char::from_u32(*c as u32).unwrap())
+ .collect()
+ }
+
+ let fnptr = (*report)._base.filename;
+ let fname = if !fnptr.is_null() {
+ let c_str = ffi::CStr::from_ptr(fnptr);
+ latin1_to_string(c_str.to_bytes())
+ } else {
+ "none".to_string()
+ };
+
+ let lineno = (*report)._base.lineno;
+ let column = (*report)._base.column;
+
+ let msg_ptr = (*report)._base.message_.data_ as *const u16;
+ let msg_len = (0usize..)
+ .find(|&i| *msg_ptr.offset(i as isize) == 0)
+ .unwrap();
+ let msg_slice = slice::from_raw_parts(msg_ptr, msg_len);
+ let msg = String::from_utf16_lossy(msg_slice);
+
+ warn!("Warning at {}:{}:{}: {}\n", fname, lineno, column, msg);
+}
+
+impl JSNativeWrapper {
+ fn is_zeroed(&self) -> bool {
+ let JSNativeWrapper { op, info } = *self;
+ op.is_none() && info.is_null()
+ }
+}
+
+pub struct RootedIdVectorWrapper {
+ pub ptr: *mut JS::PersistentRootedIdVector,
+}
+
+impl RootedIdVectorWrapper {
+ pub fn new(cx: *mut JSContext) -> RootedIdVectorWrapper {
+ RootedIdVectorWrapper {
+ ptr: unsafe { CreateRootedIdVector(cx) },
+ }
+ }
+
+ pub fn handle_mut(&self) -> JS::MutableHandleIdVector {
+ unsafe { GetMutableHandleIdVector(self.ptr) }
+ }
+}
+
+impl Drop for RootedIdVectorWrapper {
+ fn drop(&mut self) {
+ unsafe { DestroyRootedIdVector(self.ptr) }
+ }
+}
+
+impl Deref for RootedIdVectorWrapper {
+ type Target = [jsid];
+
+ fn deref(&self) -> &[jsid] {
+ unsafe {
+ let mut length = 0;
+ let pointer = SliceRootedIdVector(self.ptr as *const _, &mut length);
+ slice::from_raw_parts(pointer, length)
+ }
+ }
+}
+
+/// Defines methods on `obj`. The last entry of `methods` must contain zeroed
+/// memory.
+///
+/// # Failures
+///
+/// Returns `Err` on JSAPI failure.
+///
+/// # Panics
+///
+/// Panics if the last entry of `methods` does not contain zeroed memory.
+///
+/// # Safety
+///
+/// - `cx` must be valid.
+/// - This function calls into unaudited C++ code.
+pub unsafe fn define_methods(
+ cx: *mut JSContext,
+ obj: JS::HandleObject,
+ methods: &'static [JSFunctionSpec],
+) -> Result<(), ()> {
+ assert!({
+ match methods.last() {
+ Some(&JSFunctionSpec {
+ name: JSFunctionSpec_Name { string_: name },
+ call,
+ nargs,
+ flags,
+ selfHostedName,
+ }) => {
+ name.is_null()
+ && call.is_zeroed()
+ && nargs == 0
+ && flags == 0
+ && selfHostedName.is_null()
+ }
+ None => false,
+ }
+ });
+
+ JS_DefineFunctions(cx, obj, methods.as_ptr()).to_result()
+}
+
+/// Defines attributes on `obj`. The last entry of `properties` must contain
+/// zeroed memory.
+///
+/// # Failures
+///
+/// Returns `Err` on JSAPI failure.
+///
+/// # Panics
+///
+/// Panics if the last entry of `properties` does not contain zeroed memory.
+///
+/// # Safety
+///
+/// - `cx` must be valid.
+/// - This function calls into unaudited C++ code.
+pub unsafe fn define_properties(
+ cx: *mut JSContext,
+ obj: JS::HandleObject,
+ properties: &'static [JSPropertySpec],
+) -> Result<(), ()> {
+ assert!(!properties.is_empty());
+ assert!({
+ let spec = properties.last().unwrap();
+ let slice = slice::from_raw_parts(
+ spec as *const _ as *const u8,
+ mem::size_of::<JSPropertySpec>(),
+ );
+ slice.iter().all(|byte| *byte == 0)
+ });
+
+ JS_DefineProperties(cx, obj, properties.as_ptr()).to_result()
+}
+
+static SIMPLE_GLOBAL_CLASS_OPS: JSClassOps = JSClassOps {
+ addProperty: None,
+ delProperty: None,
+ enumerate: Some(JS_EnumerateStandardClasses),
+ newEnumerate: None,
+ resolve: Some(JS_ResolveStandardClass),
+ mayResolve: Some(JS_MayResolveStandardClass),
+ finalize: None,
+ call: None,
+ hasInstance: None,
+ construct: None,
+ trace: Some(JS_GlobalObjectTraceHook),
+};
+
+/// This is a simple `JSClass` for global objects, primarily intended for tests.
+pub static SIMPLE_GLOBAL_CLASS: JSClass = JSClass {
+ name: b"Global\0" as *const u8 as *const _,
+ flags: (JSCLASS_IS_GLOBAL
+ | ((JSCLASS_GLOBAL_SLOT_COUNT & JSCLASS_RESERVED_SLOTS_MASK)
+ << JSCLASS_RESERVED_SLOTS_SHIFT)) as u32,
+ cOps: &SIMPLE_GLOBAL_CLASS_OPS as *const JSClassOps,
+ spec: 0 as *mut _,
+ ext: 0 as *mut _,
+ oOps: 0 as *mut _,
+};
+
+#[inline]
+unsafe fn get_object_group(obj: *mut JSObject) -> *mut JS::shadow::ObjectGroup {
+ assert!(!obj.is_null());
+ let obj = obj as *mut JS::shadow::Object;
+ (*obj).group
+}
+
+#[inline]
+pub unsafe fn get_object_class(obj: *mut JSObject) -> *const JSClass {
+ (*get_object_group(obj)).clasp as *const _
+}
+
+#[inline]
+pub unsafe fn get_object_compartment(obj: *mut JSObject) -> *mut JS::Compartment {
+ let realm = (*get_object_group(obj)).realm as *const JS::shadow::Realm;
+ (*realm).compartment_
+}
+
+#[inline]
+pub fn is_dom_class(class: &JSClass) -> bool {
+ class.flags & JSCLASS_IS_DOMJSCLASS != 0
+}
+
+#[inline]
+pub unsafe fn is_dom_object(obj: *mut JSObject) -> bool {
+ is_dom_class(&*get_object_class(obj))
+}
+
+#[inline]
+pub unsafe fn is_global(obj: *mut JSObject) -> bool {
+ (*get_object_class(obj)).flags & JSCLASS_IS_GLOBAL != 0
+}
+
+#[inline]
+pub unsafe fn is_window(obj: *mut JSObject) -> bool {
+ is_global(obj) && js::detail::IsWindowSlow(obj)
+}
+
+#[inline]
+pub unsafe fn try_to_outerize(rval: JS::MutableHandleValue) {
+ let obj = rval.to_object();
+ if is_window(obj) {
+ let obj = js::detail::ToWindowProxyIfWindowSlow(obj);
+ assert!(!obj.is_null());
+ rval.set(jsval::ObjectValue(&mut *obj));
+ }
+}
+
+#[inline]
+pub unsafe fn maybe_wrap_object_value(cx: *mut JSContext, rval: JS::MutableHandleValue) {
+ assert!(rval.is_object());
+
+ // There used to be inline checks if this out of line call was necessary or
+ // not here, but JSAPI no longer exposes a way to get a JSContext's
+ // compartment, and additionally JSContext is under a bunch of churn in
+ // JSAPI in general right now.
+
+ assert!(JS_WrapValue(cx, rval));
+}
+
+#[inline]
+pub unsafe fn maybe_wrap_object_or_null_value(cx: *mut JSContext, rval: JS::MutableHandleValue) {
+ assert!(rval.is_object_or_null());
+ if !rval.is_null() {
+ maybe_wrap_object_value(cx, rval);
+ }
+}
+
+#[inline]
+pub unsafe fn maybe_wrap_value(cx: *mut JSContext, rval: JS::MutableHandleValue) {
+ if rval.is_string() {
+ assert!(JS_WrapValue(cx, rval));
+ } else if rval.is_object() {
+ maybe_wrap_object_value(cx, rval);
+ }
+}
+
+/// Equivalents of the JS_FN* macros.
+impl JSFunctionSpec {
+ pub fn js_fs(
+ name: *const ::std::os::raw::c_char,
+ func: JSNative,
+ nargs: u16,
+ flags: u16,
+ ) -> JSFunctionSpec {
+ JSFunctionSpec {
+ name: JSFunctionSpec_Name { string_: name },
+ call: JSNativeWrapper {
+ op: func,
+ info: ptr::null(),
+ },
+ nargs: nargs,
+ flags: flags,
+ selfHostedName: 0 as *const _,
+ }
+ }
+
+ pub fn js_fn(
+ name: *const ::std::os::raw::c_char,
+ func: JSNative,
+ nargs: u16,
+ flags: u16,
+ ) -> JSFunctionSpec {
+ JSFunctionSpec {
+ name: JSFunctionSpec_Name { string_: name },
+ call: JSNativeWrapper {
+ op: func,
+ info: ptr::null(),
+ },
+ nargs: nargs,
+ flags: flags,
+ selfHostedName: 0 as *const _,
+ }
+ }
+
+ pub const NULL: JSFunctionSpec = JSFunctionSpec {
+ name: JSFunctionSpec_Name {
+ string_: 0 as *const _,
+ },
+ call: JSNativeWrapper {
+ op: None,
+ info: 0 as *const _,
+ },
+ nargs: 0,
+ flags: 0,
+ selfHostedName: 0 as *const _,
+ };
+}
+
+/// Equivalents of the JS_PS* macros.
+impl JSPropertySpec {
+ pub fn getter(
+ name: *const ::std::os::raw::c_char,
+ flags: u8,
+ func: JSNative,
+ ) -> JSPropertySpec {
+ debug_assert_eq!(flags & !(JSPROP_ENUMERATE | JSPROP_PERMANENT), 0);
+ JSPropertySpec {
+ name: JSPropertySpec_Name { string_: name },
+ flags_: flags,
+ u: JSPropertySpec_AccessorsOrValue {
+ accessors: JSPropertySpec_AccessorsOrValue_Accessors {
+ getter: JSPropertySpec_Accessor {
+ native: JSNativeWrapper {
+ op: func,
+ info: ptr::null(),
+ },
+ },
+ setter: JSPropertySpec_Accessor {
+ native: JSNativeWrapper {
+ op: None,
+ info: ptr::null(),
+ },
+ },
+ },
+ },
+ }
+ }
+
+ pub fn getter_setter(
+ name: *const ::std::os::raw::c_char,
+ flags: u8,
+ g_f: JSNative,
+ s_f: JSNative,
+ ) -> JSPropertySpec {
+ debug_assert_eq!(flags & !(JSPROP_ENUMERATE | JSPROP_PERMANENT), 0);
+ JSPropertySpec {
+ name: JSPropertySpec_Name { string_: name },
+ flags_: flags,
+ u: JSPropertySpec_AccessorsOrValue {
+ accessors: JSPropertySpec_AccessorsOrValue_Accessors {
+ getter: JSPropertySpec_Accessor {
+ native: JSNativeWrapper {
+ op: g_f,
+ info: ptr::null(),
+ },
+ },
+ setter: JSPropertySpec_Accessor {
+ native: JSNativeWrapper {
+ op: s_f,
+ info: ptr::null(),
+ },
+ },
+ },
+ },
+ }
+ }
+
+ pub const NULL: JSPropertySpec = JSPropertySpec {
+ name: JSPropertySpec_Name {
+ string_: 0 as *const _,
+ },
+ flags_: 0,
+ u: JSPropertySpec_AccessorsOrValue {
+ accessors: JSPropertySpec_AccessorsOrValue_Accessors {
+ getter: JSPropertySpec_Accessor {
+ native: JSNativeWrapper {
+ op: None,
+ info: 0 as *const _,
+ },
+ },
+ setter: JSPropertySpec_Accessor {
+ native: JSNativeWrapper {
+ op: None,
+ info: 0 as *const _,
+ },
+ },
+ },
+ },
+ };
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 22:17:09 +0000