@ -18,8 +18,7 @@ use crate::{
environments ::{ EnvironmentStack , PrivateEnvironment } ,
error ::JsNativeError ,
js_string ,
native_function ::NativeFunction ,
object ::{ internal_methods ::get_prototype_from_constructor , JsObject , Object , ObjectData } ,
object ::{ internal_methods ::get_prototype_from_constructor , JsObject , ObjectData } ,
object ::{ JsFunction , PrivateElement , PrivateName } ,
property ::{ Attribute , PropertyDescriptor , PropertyKey } ,
realm ::Realm ,
@ -146,107 +145,31 @@ unsafe impl Trace for ClassFieldDefinition {
#[ derive(Finalize) ]
pub ( crate ) enum FunctionKind {
/// A rust function.
Native {
/// The rust function.
function : NativeFunction ,
/// The kind of the function constructor if it is a constructor.
constructor : Option < ConstructorKind > ,
} ,
/// A bytecode function.
Ordinary {
/// The code block containing the compiled function.
code : Gc < CodeBlock > ,
/// The `[[Environment]]` internal slot.
environments : EnvironmentStack ,
/// The `[[ConstructorKind]]` internal slot.
constructor_kind : ConstructorKind ,
/// The `[[HomeObject]]` internal slot.
home_object : Option < JsObject > ,
/// The `[[Fields]]` internal slot.
fields : ThinVec < ClassFieldDefinition > ,
/// The `[[PrivateMethods]]` internal slot.
private_methods : ThinVec < ( PrivateName , PrivateElement ) > ,
/// The class object that this function is associated with.
class_object : Option < JsObject > ,
/// The `[[ScriptOrModule]]` internal slot.
script_or_module : Option < ActiveRunnable > ,
} ,
/// A bytecode async function.
Async {
/// The code block containing the compiled function.
code : Gc < CodeBlock > ,
/// The `[[Environment]]` internal slot.
environments : EnvironmentStack ,
/// The `[[HomeObject]]` internal slot.
home_object : Option < JsObject > ,
/// The class object that this function is associated with.
class_object : Option < JsObject > ,
/// The `[[ScriptOrModule]]` internal slot.
script_or_module : Option < ActiveRunnable > ,
} ,
Async ,
/// A bytecode generator function.
Generator {
/// The code block containing the compiled function.
code : Gc < CodeBlock > ,
/// The `[[Environment]]` internal slot.
environments : EnvironmentStack ,
/// The `[[HomeObject]]` internal slot.
home_object : Option < JsObject > ,
/// The class object that this function is associated with.
class_object : Option < JsObject > ,
/// The `[[ScriptOrModule]]` internal slot.
script_or_module : Option < ActiveRunnable > ,
} ,
Generator ,
/// A bytecode async generator function.
AsyncGenerator {
/// The code block containing the compiled function.
code : Gc < CodeBlock > ,
/// The `[[Environment]]` internal slot.
environments : EnvironmentStack ,
/// The `[[HomeObject]]` internal slot.
home_object : Option < JsObject > ,
/// The class object that this function is associated with.
class_object : Option < JsObject > ,
/// The `[[ScriptOrModule]]` internal slot.
script_or_module : Option < ActiveRunnable > ,
} ,
AsyncGenerator ,
}
impl fmt ::Debug for FunctionKind {
fn fmt ( & self , f : & mut fmt ::Formatter < ' _ > ) -> fmt ::Result {
match self {
Self ::Native {
function ,
constructor ,
} = > f
. debug_struct ( "FunctionKind::Native" )
. field ( "function" , & function )
. field ( "constructor" , & constructor )
. finish ( ) ,
Self ::Ordinary { .. } = > f
. debug_struct ( "FunctionKind::Ordinary" )
. finish_non_exhaustive ( ) ,
@ -266,77 +189,65 @@ impl fmt::Debug for FunctionKind {
unsafe impl Trace for FunctionKind {
custom_trace ! { this , {
match this {
Self ::Native { function , .. } = > { mark ( function ) }
Self ::Ordinary {
code ,
environments ,
home_object ,
fields ,
private_methods ,
class_object ,
script_or_module ,
..
} = > {
mark ( code ) ;
mark ( environments ) ;
mark ( home_object ) ;
for elem in fields {
mark ( elem ) ;
}
for ( _ , elem ) in private_methods {
mark ( elem ) ;
}
mark ( class_object ) ;
mark ( script_or_module ) ;
}
Self ::Async { code , environments , home_object , class_object , script_or_module }
| Self ::Generator { code , environments , home_object , class_object , script_or_module }
| Self ::AsyncGenerator { code , environments , home_object , class_object , script_or_module } = > {
mark ( code ) ;
mark ( environments ) ;
mark ( home_object ) ;
mark ( class_object ) ;
mark ( script_or_module ) ;
}
Self ::Async
| Self ::Generator
| Self ::AsyncGenerator = > { }
}
} }
}
/// Boa representation of a Function Object.
/// Boa representation of a JavaScript Function Object.
///
/// `FunctionBody` is specific to this interpreter, it will either be Rust code or JavaScript code
/// (AST Node).
///
/// <https://tc39.es/ecma262/#sec-ecmascript-function-objects>
#[ derive(Debug, Trace, Finalize) ]
pub struct Function {
kind : FunctionKind ,
realm : Realm ,
pub struct OrdinaryFunction {
/// The code block containing the compiled function.
pub ( crate ) code : Gc < CodeBlock > ,
/// The `[[Environment]]` internal slot.
pub ( crate ) environments : EnvironmentStack ,
/// The `[[HomeObject]]` internal slot.
pub ( crate ) home_object : Option < JsObject > ,
/// The class object that this function is associated with.
pub ( crate ) class_object : Option < JsObject > ,
/// The `[[ScriptOrModule]]` internal slot.
pub ( crate ) script_or_module : Option < ActiveRunnable > ,
/// The [`Realm`] the function is defined in.
pub ( crate ) realm : Realm ,
/// The kind of ordinary function.
pub ( crate ) kind : FunctionKind ,
}
impl Function {
/// Returns the codeblock of the function, or `None` if the function is a [`NativeFunction`].
impl Ordinary Function {
/// Returns the codeblock of the function.
#[ must_use ]
pub fn codeblock ( & self ) -> Option < & CodeBlock > {
match & self . kind {
FunctionKind ::Native { .. } = > None ,
FunctionKind ::Ordinary { code , .. }
| FunctionKind ::Async { code , .. }
| FunctionKind ::Generator { code , .. }
| FunctionKind ::AsyncGenerator { code , .. } = > Some ( code ) ,
}
}
/// Creates a new `Function`.
pub ( crate ) fn new ( kind : FunctionKind , realm : Realm ) -> Self {
Self { kind , realm }
pub fn codeblock ( & self ) -> & CodeBlock {
& self . code
}
/// Push a private environment to the function.
pub ( crate ) fn push_private_environment ( & mut self , environment : Gc < PrivateEnvironment > ) {
if let FunctionKind ::Ordinary { environments , .. } = & mut self . kind {
environments . push_private ( environment ) ;
}
self . environments . push_private ( environment ) ;
}
/// Returns true if the function object is a derived constructor.
@ -353,33 +264,17 @@ impl Function {
/// Does this function have the `[[ClassFieldInitializerName]]` internal slot set to non-empty value.
pub ( crate ) fn in_class_field_initializer ( & self ) -> bool {
if let FunctionKind ::Ordinary { code , .. } = & self . kind {
code . in_class_field_initializer ( )
} else {
false
}
self . code . in_class_field_initializer ( )
}
/// Returns a reference to the function `[[HomeObject]]` slot if present.
pub ( crate ) const fn get_home_object ( & self ) -> Option < & JsObject > {
match & self . kind {
FunctionKind ::Ordinary { home_object , .. }
| FunctionKind ::Async { home_object , .. }
| FunctionKind ::Generator { home_object , .. }
| FunctionKind ::AsyncGenerator { home_object , .. } = > home_object . as_ref ( ) ,
FunctionKind ::Native { .. } = > None ,
}
self . home_object . as_ref ( )
}
/// Sets the `[[HomeObject]]` slot if present.
pub ( crate ) fn set_home_object ( & mut self , object : JsObject ) {
match & mut self . kind {
FunctionKind ::Ordinary { home_object , .. }
| FunctionKind ::Async { home_object , .. }
| FunctionKind ::Generator { home_object , .. }
| FunctionKind ::AsyncGenerator { home_object , .. } = > * home_object = Some ( object ) ,
FunctionKind ::Native { .. } = > { }
}
self . home_object = Some ( object ) ;
}
/// Returns the values of the `[[Fields]]` internal slot.
@ -429,13 +324,7 @@ impl Function {
/// Sets the class object.
pub ( crate ) fn set_class_object ( & mut self , object : JsObject ) {
match & mut self . kind {
FunctionKind ::Ordinary { class_object , .. }
| FunctionKind ::Async { class_object , .. }
| FunctionKind ::Generator { class_object , .. }
| FunctionKind ::AsyncGenerator { class_object , .. } = > * class_object = Some ( object ) ,
FunctionKind ::Native { .. } = > { }
}
self . class_object = Some ( object ) ;
}
/// Gets the `Realm` from where this function originates.
@ -961,12 +850,25 @@ impl BuiltInFunctionObject {
#[ allow(clippy::wrong_self_convention) ]
fn to_string ( this : & JsValue , _ : & [ JsValue ] , context : & mut Context < ' _ > ) -> JsResult < JsValue > {
let object = this . as_object ( ) . map ( JsObject ::borrow ) ;
let function = objec t
. as_deref ( )
. and_then ( Object ::as_function )
. ok_or_else ( | | JsNativeError ::typ ( ) . with_message ( "Not a function" ) ) ? ;
// 1. Let func be the this value.
let func = this ;
// 2. If func is an Object, func has a [[SourceText]] internal slot, func.[[SourceText]] is a sequence of Unicode code points,and HostHasSourceTextAvailable(func) is true, then
// a. Return CodePointsToString(func.[[SourceText]]).
// 3. If func is a built-in function object, return an implementation-defined String source code representation of func.
// The representation must have the syntax of a NativeFunction. Additionally, if func has an [[InitialName]] internal slot and
// func.[[InitialName]] is a String, the portion of the returned String that would be matched by
// NativeFunctionAccessor_opt PropertyName must be the value of func.[[InitialName]].
// 4. If func is an Object and IsCallable(func) is true, return an implementation-defined String source code representation of func.
// The representation must have the syntax of a NativeFunction.
// 5. Throw a TypeError exception.
let Some ( object ) = func . as_object ( ) else {
return Err ( JsNativeError ::typ ( ) . with_message ( "not a function" ) . into ( ) ) ;
} ;
if object . borrow ( ) . is_native_function ( ) {
let name = {
// Is there a case here where if there is no name field on a value
// name should default to None? Do all functions have names set?
@ -975,30 +877,37 @@ impl BuiltInFunctionObject {
. expect ( "checked that `this` was an object above" )
. get ( utf16 ! ( "name" ) , & mut * context ) ? ;
if value . is_null_or_undefined ( ) {
None
js_string ! ( )
} else {
Some ( value . to_string ( context ) ? )
value . to_string ( context ) ?
}
} ;
return Ok (
js_string ! ( utf16 ! ( "function " ) , & name , utf16 ! ( "() { [native code] }" ) ) . into ( ) ,
) ;
}
let object = object . borrow ( ) ;
let function = object
. as_function ( )
. ok_or_else ( | | JsNativeError ::typ ( ) . with_message ( "not a function" ) ) ? ;
let name = name
. filter ( | n | ! n . is_empty ( ) )
. unwrap_or_else ( | | "anonymous" . into ( ) ) ;
let code = function . codeblock ( ) ;
match function . kind {
FunctionKind ::Native { .. } | FunctionKind ::Ordinary { .. } = > {
Ok ( js_string ! ( utf16 ! ( "[Function: " ) , & name , utf16 ! ( "]" ) ) . into ( ) )
let prefix = match function . kind {
FunctionKind ::Ordinary { .. } = > {
utf16 ! ( "function " )
}
FunctionKind ::Async { .. } = > {
Ok ( js_string ! ( utf16 ! ( "[AsyncFunction: " ) , & name , utf16 ! ( "]" ) ) . into ( ) )
utf16 ! ( "async function " )
}
FunctionKind ::Generator { .. } = > {
Ok ( js_string ! ( utf16 ! ( "[GeneratorFunction: " ) , & name , utf16 ! ( "]" ) ) . into ( ) )
}
FunctionKind ::AsyncGenerator { .. } = > {
Ok ( js_string ! ( utf16 ! ( "[AsyncGeneratorFunction: " ) , & name , utf16 ! ( "]" ) ) . into ( ) )
}
utf16 ! ( "function* " )
}
FunctionKind ::AsyncGenerator { .. } = > utf16 ! ( "async function* " ) ,
} ;
Ok ( js_string ! ( prefix , code . name ( ) , utf16 ! ( "() { [native code] }" ) ) . into ( ) )
}
/// `Function.prototype [ @@hasInstance ] ( V )`
Haled Odat
12 months ago
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