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Refactor binding handling APIs (#2870) 

We have currently some bugs related to binding assignments on arithmetic operations (`+=`, `++`, `?=`, etc.), but fixing those was getting a bit complex with our current bindings APIs.

This PR refactors our binding handling APIs to be a bit easier to use.
pull/2872/head
José Julián Espina 2 years ago
parent
1f4ff6d379
commit
e7c689c0d5
7 changed files with 185 additions and 492 deletions
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  1. 2
      boa_engine/src/builtins/eval/mod.rs
  2. 407
      boa_engine/src/environments/runtime.rs
  3. 14
      boa_engine/src/vm/code_block.rs
  4. 36
      boa_engine/src/vm/opcode/define/mod.rs
  5. 44
      boa_engine/src/vm/opcode/delete/mod.rs
  6. 91
      boa_engine/src/vm/opcode/get/name.rs
  7. 55
      boa_engine/src/vm/opcode/set/name.rs

2
boa_engine/src/builtins/eval/mod.rs
Unescape View File

@ -213,7 +213,7 @@ impl Eval {
// Poison the last parent function environment, because it may contain new declarations after/during eval.
if !strict {
context.vm.environments.poison_last_function();
context.vm.environments.poison_until_last_function();
}
// Set the compile time environment to the current running environment and save the number of current environments.

407
boa_engine/src/environments/runtime.rs
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@ -266,6 +266,7 @@ impl Environment {
}
/// Returns the declarative environment and panic if it is not one.
#[track_caller]
pub(crate) fn declarative_expect(&self) -> &Gc<DeclarativeEnvironment> {
self.as_declarative()
.expect("environment must be declarative")
@ -418,8 +419,8 @@ impl DeclarativeEnvironmentStack {
let environment = self
.stack
.iter()
.filter_map(Environment::as_declarative)
.last()
.rev()
.find_map(Environment::as_declarative)
.expect("global environment must always exist");
(environment.poisoned.get(), with || environment.with.get())
};
@ -464,8 +465,8 @@ impl DeclarativeEnvironmentStack {
let environment = self
.stack
.iter()
.filter_map(Environment::as_declarative)
.last()
.rev()
.find_map(Environment::as_declarative)
.expect("global environment must always exist");
(environment.poisoned.get(), with || environment.with.get())
};
@ -523,9 +524,8 @@ impl DeclarativeEnvironmentStack {
let environment = self
.stack
.iter()
.filter_map(Environment::as_declarative)
.filter(|e| e.slots().is_some())
.last()
.rev()
.find_map(|env| env.as_declarative().filter(|decl| decl.slots().is_some()))
.expect("global environment must always exist");
(
environment.poisoned.get(),
@ -545,6 +545,7 @@ impl DeclarativeEnvironmentStack {
}
/// Pop environment from the environments stack.
#[track_caller]
pub(crate) fn pop(&mut self) -> Environment {
debug_assert!(self.stack.len() > 1);
self.stack
@ -557,11 +558,11 @@ impl DeclarativeEnvironmentStack {
/// # Panics
///
/// Panics if no environment exists on the stack.
pub(crate) fn current(&mut self) -> Gc<DeclarativeEnvironment> {
#[track_caller]
pub(crate) fn current(&mut self) -> Environment {
self.stack
.last()
.expect("global environment must always exist")
.declarative_expect()
.clone()
}
@ -582,68 +583,27 @@ impl DeclarativeEnvironmentStack {
/// Mark that there may be added bindings from the current environment to the next function
/// environment.
pub(crate) fn poison_last_function(&mut self) {
for env in self.stack.iter_mut().rev() {
if let Some(env) = env.as_declarative() {
if env.compile_env().borrow().is_function() {
pub(crate) fn poison_until_last_function(&mut self) {
for env in self
.stack
.iter()
.rev()
.filter_map(Environment::as_declarative)
{
env.poisoned.set(true);
if env.compile_env().borrow().is_function() {
return;
}
}
}
}
/// Get the value of a binding. Ignores object environments.
///
/// # Panics
///
/// Panics if the environment or binding index are out of range.
pub(crate) fn get_value_optional(
&self,
mut environment_index: usize,
mut binding_index: usize,
name: Identifier,
) -> Option<JsValue> {
if environment_index != self.stack.len() - 1 {
for env_index in (environment_index + 1..self.stack.len()).rev() {
let Environment::Declarative(env) = self
.stack
.get(env_index)
.expect("environment index must be in range") else {
continue;
};
if !env.poisoned.get() {
break;
}
let compile = env.compile.borrow();
if compile.is_function() {
if let Some(b) = compile.get_binding(name) {
environment_index = b.environment_index;
binding_index = b.binding_index;
break;
}
}
}
}
self.stack
.get(environment_index)
.expect("environment index must be in range")
.declarative_expect()
.bindings
.borrow()
.get(binding_index)
.expect("binding index must be in range")
.clone()
}
/// Set the value of a binding.
/// Set the value of a declarative binding.
///
/// # Panics
///
/// Panics if the environment or binding index are out of range.
#[track_caller]
pub(crate) fn put_value(
pub(crate) fn put_declarative_value(
&mut self,
environment_index: usize,
binding_index: usize,
@ -688,37 +648,6 @@ impl DeclarativeEnvironmentStack {
*binding = Some(value);
}
}
/// Check if a binding name does exist in a poisoned environment.
///
/// A binding could be marked as `global`, and at the same time, exist in a deeper environment
/// context; if the global context is poisoned, an `eval` call could have added a binding that is
/// not global with the same name as the global binding. This double checks that the binding name
/// is truly a global property.
///
/// # Panics
///
/// Panics if the global environment does not exist.
pub(crate) fn binding_in_poisoned_environment(&mut self, name: Identifier) -> bool {
for env in self
.stack
.split_first()
.expect("global environment must exist")
.1
.iter()
.filter_map(Environment::as_declarative)
.rev()
{
if !env.poisoned.get() {
return false;
}
let compile = env.compile.borrow();
if compile.is_function() && compile.get_binding(name).is_some() {
return true;
}
}
false
}
}
/// A binding locator contains all information about a binding that is needed to resolve it at runtime.
@ -736,7 +665,7 @@ pub(crate) struct BindingLocator {
impl BindingLocator {
/// Creates a new declarative binding locator that has knows indices.
pub(in crate::environments) const fn declarative(
pub(crate) const fn declarative(
name: Identifier,
environment_index: usize,
binding_index: usize,
@ -830,26 +759,33 @@ impl BindingLocator {
}
impl Context<'_> {
/// Get the value of a binding.
/// Gets the corresponding runtime binding of the provided `BindingLocator`, modifying
/// its indexes in place.
///
/// # Panics
/// This readjusts a `BindingLocator` to the correct binding if a `with` environment or
/// `eval` call modified the compile-time bindings.
///
/// Panics if the environment or binding index are out of range.
pub(crate) fn get_value_optional(
&mut self,
mut environment_index: usize,
mut binding_index: usize,
name: Identifier,
) -> JsResult<Option<JsValue>> {
for env_index in (environment_index + 1..self.vm.environments.stack.len()).rev() {
/// Only use if the binding origin is unknown or comes from a `var` declaration. Lexical bindings
/// are completely removed of runtime checks because the specification guarantees that runtime
/// semantics cannot add or remove lexical bindings.
pub(crate) fn find_runtime_binding(&mut self, locator: &mut BindingLocator) -> JsResult<()> {
let current = self.vm.environments.current();
if let Some(env) = current.as_declarative() {
if !env.with.get() && !env.poisoned.get() {
return Ok(());
}
}
for env_index in (locator.environment_index..self.vm.environments.stack.len()).rev() {
match self.environment_expect(env_index) {
Environment::Declarative(env) => {
if env.poisoned.get() {
let compile = env.compile.borrow();
if compile.is_function() {
if let Some(b) = compile.get_binding(name) {
environment_index = b.environment_index;
binding_index = b.binding_index;
if let Some(b) = compile.get_binding(locator.name) {
locator.environment_index = b.environment_index;
locator.binding_index = b.binding_index;
locator.global = false;
break;
}
}
@ -861,7 +797,7 @@ impl Context<'_> {
let o = o.clone();
let key: JsString = self
.interner()
.resolve_expect(name.sym())
.resolve_expect(locator.name.sym())
.into_common(false);
if o.has_property(key.clone(), self)? {
if let Some(unscopables) = o.get(JsSymbol::unscopables(), self)?.as_object()
@ -870,239 +806,140 @@ impl Context<'_> {
continue;
}
}
return o.get(key, self).map(Some);
locator.environment_index = env_index;
locator.global = false;
break;
}
}
}
}
Ok(self
.environment_expect(environment_index)
.declarative_expect()
.bindings
.borrow()
.get(binding_index)
.expect("binding index must be in range")
.clone())
Ok(())
}
/// Get the value of a binding by it's name.
/// Checks if the binding pointed by `locator` is initialized.
///
/// This only considers function environments that are poisoned.
/// All other bindings are accessed via indices.
pub(crate) fn get_value_if_global_poisoned(
&mut self,
name: Identifier,
) -> JsResult<Option<JsValue>> {
for env_index in (0..self.vm.environments.stack.len()).rev() {
let env = self.environment_expect(env_index);
match env {
Environment::Declarative(env) => {
if env.poisoned.get() {
let compile = env.compile.borrow();
if compile.is_function() {
if let Some(b) = compile.get_binding(name) {
return Ok(self
.environment_expect(b.environment_index)
.declarative_expect()
.bindings
.borrow()
.get(b.binding_index)
.expect("binding index must be in range")
.clone());
}
} else if !env.with.get() {
return Ok(None);
}
}
}
Environment::Object(o) => {
let o = o.clone();
/// # Panics
///
/// Panics if the environment or binding index are out of range.
pub(crate) fn is_initialized_binding(&mut self, locator: &BindingLocator) -> JsResult<bool> {
if locator.global {
let key: JsString = self
.interner()
.resolve_expect(name.sym())
.resolve_expect(locator.name.sym())
.into_common(false);
if o.has_property(key.clone(), self)? {
if let Some(unscopables) = o.get(JsSymbol::unscopables(), self)?.as_object()
{
if unscopables.get(key.clone(), self)?.to_boolean() {
continue;
}
}
return o.get(key, self).map(Some);
}
self.global_object().has_property(key, self)
} else {
match self.environment_expect(locator.environment_index) {
Environment::Declarative(env) => {
Ok(env.bindings.borrow()[locator.binding_index].is_some())
}
Environment::Object(_) => Ok(true),
}
}
Ok(None)
}
/// Set the value of a binding if it is initialized.
/// Return `true` if the value has been set.
/// Get the value of a binding.
///
/// # Panics
///
/// Panics if the environment or binding index are out of range.
pub(crate) fn put_value_if_initialized(
&mut self,
mut environment_index: usize,
mut binding_index: usize,
name: Identifier,
value: JsValue,
strict: bool,
) -> JsResult<bool> {
for env_index in (environment_index + 1..self.vm.environments.stack.len()).rev() {
let env = self.environment_expect(env_index);
match env {
Environment::Declarative(env) => {
if env.poisoned.get() {
let compile = env.compile.borrow();
if compile.is_function() {
if let Some(b) = compile.get_binding(name) {
environment_index = b.environment_index;
binding_index = b.binding_index;
break;
}
}
} else if !env.with.get() {
break;
}
}
Environment::Object(o) => {
let o = o.clone();
pub(crate) fn get_binding(&mut self, locator: BindingLocator) -> JsResult<Option<JsValue>> {
if locator.global {
let global = self.global_object();
let key: JsString = self
.interner()
.resolve_expect(name.sym())
.resolve_expect(locator.name.sym())
.into_common(false);
if o.has_property(key.clone(), self)? {
if let Some(unscopables) = o.get(JsSymbol::unscopables(), self)?.as_object()
{
if unscopables.get(key.clone(), self)?.to_boolean() {
continue;
if global.has_property(key.clone(), self)? {
global.get(key, self).map(Some)
} else {
Ok(None)
}
} else {
match self.environment_expect(locator.environment_index) {
Environment::Declarative(env) => {
Ok(env.bindings.borrow()[locator.binding_index].clone())
}
return o.set(key, value, strict, self);
Environment::Object(obj) => {
let obj = obj.clone();
let key: JsString = self
.interner()
.resolve_expect(locator.name.sym())
.into_common(false);
obj.get(key, self).map(Some)
}
}
}
}
let mut bindings = self
.environment_expect(environment_index)
.declarative_expect()
.bindings
.borrow_mut();
let binding = bindings
.get_mut(binding_index)
.expect("binding index must be in range");
if binding.is_none() {
Ok(false)
} else {
*binding = Some(value);
Ok(true)
}
}
/// Set the value of a binding by it's name.
///
/// This only considers function environments that are poisoned.
/// All other bindings are set via indices.
/// Sets the value of a binding.
///
/// # Panics
///
/// Panics if the environment or binding index are out of range.
pub(crate) fn put_value_if_global_poisoned(
#[track_caller]
pub(crate) fn set_binding(
&mut self,
name: Identifier,
value: &JsValue,
locator: BindingLocator,
value: JsValue,
strict: bool,
) -> JsResult<bool> {
for env_index in (0..self.vm.environments.stack.len()).rev() {
let env = self.environment_expect(env_index);
) -> JsResult<()> {
if locator.global {
let key = self
.interner()
.resolve_expect(locator.name().sym())
.into_common::<JsString>(false);
match env {
Environment::Declarative(env) => {
if env.poisoned.get() {
let compile = env.compile.borrow();
if compile.is_function() {
if let Some(b) = compile.get_binding(name) {
let mut bindings = self
.environment_expect(b.environment_index)
.declarative_expect()
.bindings
.borrow_mut();
let binding = bindings
.get_mut(b.binding_index)
.expect("binding index must be in range");
*binding = Some(value.clone());
return Ok(true);
}
}
} else if !env.with.get() {
return Ok(false);
}
self.global_object().set(key, value, strict, self)?;
} else {
match self.environment_expect(locator.environment_index) {
Environment::Declarative(decl) => {
decl.bindings.borrow_mut()[locator.binding_index] = Some(value);
}
Environment::Object(o) => {
let o = o.clone();
Environment::Object(obj) => {
let obj = obj.clone();
let key: JsString = self
.interner()
.resolve_expect(name.sym())
.resolve_expect(locator.name.sym())
.into_common(false);
if o.has_property(key.clone(), self)? {
if let Some(unscopables) = o.get(JsSymbol::unscopables(), self)?.as_object()
{
if unscopables.get(key.clone(), self)?.to_boolean() {
continue;
}
}
return o.set(key, value.clone(), strict, self);
}
obj.set(key, value, strict, self)?;
}
}
}
Ok(false)
Ok(())
}
/// Delete a binding form an object environment if it exists.
/// Deletes a binding if it exists.
///
/// Returns a tuple of `(found, deleted)`.
pub(crate) fn delete_binding_from_object_environment(
&mut self,
name: Identifier,
) -> JsResult<(bool, bool)> {
for env_index in (0..self.vm.environments.stack.len()).rev() {
let env = self.environment_expect(env_index);
match env {
Environment::Object(o) => {
let o = o.clone();
/// Returns `true` if the binding was deleted.
///
/// # Panics
///
/// Panics if the environment or binding index are out of range.
pub(crate) fn delete_binding(&mut self, locator: BindingLocator) -> JsResult<bool> {
if locator.is_global() {
let key: JsString = self
.interner()
.resolve_expect(locator.name().sym())
.into_common::<JsString>(false);
self.global_object().__delete__(&key.into(), self)
} else {
match self.environment_expect(locator.environment_index) {
Environment::Declarative(_) => Ok(false),
Environment::Object(obj) => {
let obj = obj.clone();
let key: JsString = self
.interner()
.resolve_expect(name.sym())
.resolve_expect(locator.name.sym())
.into_common(false);
if o.has_property(key.clone(), self)? {
if let Some(unscopables) = o.get(JsSymbol::unscopables(), self)?.as_object()
{
if unscopables.get(key.clone(), self)?.to_boolean() {
continue;
}
}
return Ok((true, o.__delete__(&key.into(), self)?));
}
}
Environment::Declarative(env) => {
if !env.with.get() {
return Ok((false, false));
}
obj.__delete__(&key.into(), self)
}
}
}
Ok((false, false))
}
/// Return the environment at the given index. Panics if the index is out of range.

14
boa_engine/src/vm/code_block.rs
Unescape View File

@ -952,7 +952,7 @@ impl JsObject {
context
.vm
.environments
.put_value(index, 0, class_object.into());
.put_declarative_value(index, 0, class_object.into());
last_env -= 1;
}
@ -964,7 +964,7 @@ impl JsObject {
context
.vm
.environments
.put_value(index, 0, self.clone().into());
.put_declarative_value(index, 0, self.clone().into());
last_env -= 1;
}
@ -994,11 +994,11 @@ impl JsObject {
&this_function_object,
&code.params,
args,
&env,
env.declarative_expect(),
context,
)
};
context.vm.environments.put_value(
context.vm.environments.put_declarative_value(
binding.environment_index(),
binding.binding_index(),
arguments_obj.into(),
@ -1202,7 +1202,7 @@ impl JsObject {
context
.vm
.environments
.put_value(index, 0, self.clone().into());
.put_declarative_value(index, 0, self.clone().into());
last_env -= 1;
}
@ -1231,11 +1231,11 @@ impl JsObject {
&this_function_object,
&code.params,
args,
&env,
env.declarative_expect(),
context,
)
};
context.vm.environments.put_value(
context.vm.environments.put_declarative_value(
binding.environment_index(),
binding.binding_index(),
arguments_obj.into(),

36
boa_engine/src/vm/opcode/define/mod.rs
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@ -1,6 +1,6 @@
use crate::{
vm::{opcode::Operation, CompletionType},
Context, JsResult, JsString, JsValue,
Context, JsResult, JsValue,
};
pub(crate) mod class;
@ -52,36 +52,16 @@ impl Operation for DefInitVar {
fn execute(context: &mut Context<'_>) -> JsResult<CompletionType> {
let index = context.vm.read::<u32>();
let value = context.vm.pop();
let binding_locator = context.vm.frame().code_block.bindings[index as usize];
let mut binding_locator = context.vm.frame().code_block.bindings[index as usize];
if binding_locator.is_silent() {
return Ok(CompletionType::Normal);
}
binding_locator.throw_mutate_immutable(context)?;
if binding_locator.is_global() {
if !context.put_value_if_global_poisoned(
binding_locator.name(),
&value,
context.vm.frame().code_block.strict,
)? {
let key = context
.interner()
.resolve_expect(binding_locator.name().sym())
.into_common::<JsString>(false);
context.global_object().set(
key,
value,
context.vm.frame().code_block.strict,
context,
)?;
}
} else {
context.vm.environments.put_value(
binding_locator.environment_index(),
binding_locator.binding_index(),
value,
);
}
context.find_runtime_binding(&mut binding_locator)?;
context.set_binding(binding_locator, value, context.vm.frame().code_block.strict)?;
Ok(CompletionType::Normal)
}
}
@ -100,7 +80,7 @@ impl Operation for DefLet {
fn execute(context: &mut Context<'_>) -> JsResult<CompletionType> {
let index = context.vm.read::<u32>();
let binding_locator = context.vm.frame().code_block.bindings[index as usize];
context.vm.environments.put_value(
context.vm.environments.put_declarative_value(
binding_locator.environment_index(),
binding_locator.binding_index(),
JsValue::Undefined,
@ -126,7 +106,7 @@ macro_rules! implement_declaratives {
let index = context.vm.read::<u32>();
let value = context.vm.pop();
let binding_locator = context.vm.frame().code_block.bindings[index as usize];
context.vm.environments.put_value(
context.vm.environments.put_declarative_value(
binding_locator.environment_index(),
binding_locator.binding_index(),
value,

44
boa_engine/src/vm/opcode/delete/mod.rs
Unescape View File

@ -76,50 +76,12 @@ impl Operation for DeleteName {
fn execute(context: &mut Context<'_>) -> JsResult<CompletionType> {
let index = context.vm.read::<u32>();
let binding_locator = context.vm.frame().code_block.bindings[index as usize];
let mut binding_locator = context.vm.frame().code_block.bindings[index as usize];
binding_locator.throw_mutate_immutable(context)?;
let deleted = if binding_locator.is_global()
&& !context
.vm
.environments
.binding_in_poisoned_environment(binding_locator.name())
{
let (found, deleted) =
context.delete_binding_from_object_environment(binding_locator.name())?;
if found {
context.vm.push(deleted);
return Ok(CompletionType::Normal);
}
let key: JsString = context
.interner()
.resolve_expect(binding_locator.name().sym())
.into_common::<JsString>(false);
let deleted = context
.global_object()
.__delete__(&key.clone().into(), context)?;
context.find_runtime_binding(&mut binding_locator)?;
if !deleted && context.vm.frame().code_block.strict {
return Err(JsNativeError::typ()
.with_message(format!(
"property `{}` is non-configurable and cannot be deleted",
key.to_std_string_escaped()
))
.into());
}
deleted
} else {
context
.vm
.environments
.get_value_optional(
binding_locator.environment_index(),
binding_locator.binding_index(),
binding_locator.name(),
)
.is_none()
};
let deleted = context.delete_binding(binding_locator)?;
context.vm.push(deleted);
Ok(CompletionType::Normal)

91
boa_engine/src/vm/opcode/get/name.rs
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@ -1,8 +1,7 @@
use crate::{
error::JsNativeError,
property::DescriptorKind,
vm::{opcode::Operation, CompletionType},
Context, JsResult, JsString, JsValue,
Context, JsResult,
};
/// `GetName` implements the Opcode Operation for `Opcode::GetName`
@ -18,57 +17,16 @@ impl Operation for GetName {
fn execute(context: &mut Context<'_>) -> JsResult<CompletionType> {
let index = context.vm.read::<u32>();
let binding_locator = context.vm.frame().code_block.bindings[index as usize];
let mut binding_locator = context.vm.frame().code_block.bindings[index as usize];
binding_locator.throw_mutate_immutable(context)?;
let value = if binding_locator.is_global() {
if let Some(value) = context.get_value_if_global_poisoned(binding_locator.name())? {
value
} else {
let key: JsString = context
.interner()
.resolve_expect(binding_locator.name().sym())
.into_common(false);
match context.global_object().get_property(&key.clone().into()) {
Some(desc) => match desc.kind() {
DescriptorKind::Data {
value: Some(value), ..
} => value.clone(),
DescriptorKind::Accessor { get: Some(get), .. } if !get.is_undefined() => {
let get = get.clone();
get.call(&context.global_object().into(), &[], context)?
}
_ => {
return Err(JsNativeError::reference()
.with_message(format!(
"{} is not defined",
key.to_std_string_escaped()
))
.into())
}
},
_ => {
return Err(JsNativeError::reference()
.with_message(format!("{} is not defined", key.to_std_string_escaped()))
.into())
}
}
}
} else if let Some(value) = context.get_value_optional(
binding_locator.environment_index(),
binding_locator.binding_index(),
binding_locator.name(),
)? {
value
} else {
context.find_runtime_binding(&mut binding_locator)?;
let value = context.get_binding(binding_locator)?.ok_or_else(|| {
let name = context
.interner()
.resolve_expect(binding_locator.name().sym())
.to_string();
return Err(JsNativeError::reference()
.with_message(format!("{name} is not initialized"))
.into());
};
JsNativeError::reference().with_message(format!("{name} is not defined"))
})?;
context.vm.push(value);
Ok(CompletionType::Normal)
@ -88,39 +46,12 @@ impl Operation for GetNameOrUndefined {
fn execute(context: &mut Context<'_>) -> JsResult<CompletionType> {
let index = context.vm.read::<u32>();
let binding_locator = context.vm.frame().code_block.bindings[index as usize];
let mut binding_locator = context.vm.frame().code_block.bindings[index as usize];
binding_locator.throw_mutate_immutable(context)?;
let value = if binding_locator.is_global() {
if let Some(value) = context.get_value_if_global_poisoned(binding_locator.name())? {
value
} else {
let key: JsString = context
.interner()
.resolve_expect(binding_locator.name().sym())
.into_common(false);
match context.global_object().get_property(&key.into()) {
Some(desc) => match desc.kind() {
DescriptorKind::Data {
value: Some(value), ..
} => value.clone(),
DescriptorKind::Accessor { get: Some(get), .. } if !get.is_undefined() => {
let get = get.clone();
get.call(&context.global_object().into(), &[], context)?
}
_ => JsValue::undefined(),
},
_ => JsValue::undefined(),
}
}
} else if let Some(value) = context.get_value_optional(
binding_locator.environment_index(),
binding_locator.binding_index(),
binding_locator.name(),
)? {
value
} else {
JsValue::undefined()
};
context.find_runtime_binding(&mut binding_locator)?;
let value = context.get_binding(binding_locator)?.unwrap_or_default();
context.vm.push(value);
Ok(CompletionType::Normal)

55
boa_engine/src/vm/opcode/set/name.rs
Unescape View File

@ -1,7 +1,6 @@
use crate::{
error::JsNativeError,
vm::{opcode::Operation, CompletionType},
Context, JsResult, JsString,
Context, JsNativeError, JsResult,
};
/// `SetName` implements the Opcode Operation for `Opcode::SetName`
@ -17,59 +16,43 @@ impl Operation for SetName {
fn execute(context: &mut Context<'_>) -> JsResult<CompletionType> {
let index = context.vm.read::<u32>();
let binding_locator = context.vm.frame().code_block.bindings[index as usize];
let mut binding_locator = context.vm.frame().code_block.bindings[index as usize];
let value = context.vm.pop();
if binding_locator.is_silent() {
return Ok(CompletionType::Normal);
}
binding_locator.throw_mutate_immutable(context)?;
if binding_locator.is_global() {
if !context.put_value_if_global_poisoned(
binding_locator.name(),
&value,
context.vm.frame().code_block.strict,
)? {
let key: JsString = context
context.find_runtime_binding(&mut binding_locator)?;
if !context.is_initialized_binding(&binding_locator)? {
if binding_locator.is_global() && context.vm.frame().code_block.strict {
let key = context
.interner()
.resolve_expect(binding_locator.name().sym())
.into_common(false);
let exists = context
.global_object()
.has_own_property(key.clone(), context)?;
.to_string();
if !exists && context.vm.frame().code_block.strict {
return Err(JsNativeError::reference()
.with_message(format!(
"assignment to undeclared variable {}",
key.to_std_string_escaped()
"cannot assign to uninitialized global property `{key}`"
))
.into());
}
context.global_object().set(
key,
value,
context.vm.frame().code_block.strict,
context,
)?;
}
} else if !context.put_value_if_initialized(
binding_locator.environment_index(),
binding_locator.binding_index(),
binding_locator.name(),
value,
context.vm.frame().code_block.strict,
)? {
return Err(JsNativeError::reference()
.with_message(format!(
"cannot access '{}' before initialization",
context
if !binding_locator.is_global() {
let key = context
.interner()
.resolve_expect(binding_locator.name().sym())
))
.to_string();
return Err(JsNativeError::reference()
.with_message(format!("cannot assign to uninitialized binding `{key}`"))
.into());
}
}
context.set_binding(binding_locator, value, context.vm.frame().code_block.strict)?;
Ok(CompletionType::Normal)
}
}

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