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@ -8,7 +8,7 @@ use crate::{
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object::{JsObject, ObjectData, PROTOTYPE}, |
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property::PropertyDescriptor, |
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string::utf16, |
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Context, JsString, JsValue, |
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Context, JsBigInt, JsString, JsValue, |
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}; |
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use bitflags::bitflags; |
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use boa_ast::function::FormalParameterList; |
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@ -108,6 +108,21 @@ impl Handler {
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} |
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} |
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#[derive(Clone, Debug, Trace, Finalize)] |
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pub(crate) enum Constant { |
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/// Property field names and private names `[[description]]`s.
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String(JsString), |
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Function(Gc<CodeBlock>), |
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BigInt(#[unsafe_ignore_trace] JsBigInt), |
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/// Compile time environments in this function.
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///
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// Safety: Nothing in CompileTimeEnvironment needs tracing, so this is safe.
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//
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// TODO(#3034): Maybe changing this to Gc after garbage collection would be better than Rc.
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CompileTimeEnvironment(#[unsafe_ignore_trace] Rc<CompileTimeEnvironment>), |
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} |
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/// The internal representation of a JavaScript function.
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///
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/// A `CodeBlock` is generated for each function compiled by the
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@ -135,29 +150,15 @@ pub struct CodeBlock {
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/// Bytecode
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pub(crate) bytecode: Box<[u8]>, |
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/// Literals
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pub(crate) literals: Box<[JsValue]>, |
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/// Property field names and private names `[[description]]`s.
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pub(crate) names: Box<[JsString]>, |
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pub(crate) constants: ThinVec<Constant>, |
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/// Locators for all bindings in the codeblock.
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#[unsafe_ignore_trace] |
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pub(crate) bindings: Box<[BindingLocator]>, |
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/// Functions inside this function
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pub(crate) functions: Box<[Gc<Self>]>, |
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/// Exception [`Handler`]s.
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#[unsafe_ignore_trace] |
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pub(crate) handlers: ThinVec<Handler>, |
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/// Compile time environments in this function.
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// Safety: Nothing in CompileTimeEnvironment needs tracing, so this is safe.
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//
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// TODO(#3034): Maybe changing this to Gc after garbage collection would be better than Rc.
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#[unsafe_ignore_trace] |
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pub(crate) compile_environments: Box<[Rc<CompileTimeEnvironment>]>, |
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} |
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/// ---- `CodeBlock` public API ----
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@ -169,17 +170,14 @@ impl CodeBlock {
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flags.set(CodeBlockFlags::STRICT, strict); |
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Self { |
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bytecode: Box::default(), |
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literals: Box::default(), |
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names: Box::default(), |
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constants: ThinVec::default(), |
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bindings: Box::default(), |
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functions: Box::default(), |
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name, |
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flags: Cell::new(flags), |
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length, |
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this_mode: ThisMode::Global, |
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params: FormalParameterList::default(), |
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handlers: ThinVec::default(), |
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compile_environments: Box::default(), |
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} |
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} |
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@ -252,6 +250,51 @@ impl CodeBlock {
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.rev() |
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.find(|(_, handler)| handler.contains(pc)) |
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} |
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/// Get the [`JsString`] constant from the [`CodeBlock`].
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///
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/// # Panics
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///
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/// If the type of the [`Constant`] is not [`Constant::String`].
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/// Or `index` is greater or equal to length of `constants`.
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pub(crate) fn constant_string(&self, index: usize) -> JsString { |
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if let Some(Constant::String(value)) = self.constants.get(index) { |
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return value.clone(); |
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} |
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panic!("expected string constant at index {index}") |
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} |
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/// Get the function ([`Gc<CodeBlock>`]) constant from the [`CodeBlock`].
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///
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/// # Panics
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///
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/// If the type of the [`Constant`] is not [`Constant::Function`].
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/// Or `index` is greater or equal to length of `constants`.
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pub(crate) fn constant_function(&self, index: usize) -> Gc<Self> { |
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if let Some(Constant::Function(value)) = self.constants.get(index) { |
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return value.clone(); |
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} |
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panic!("expected function constant at index {index}") |
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} |
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/// Get the [`CompileTimeEnvironment`] constant from the [`CodeBlock`].
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///
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/// # Panics
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///
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/// If the type of the [`Constant`] is not [`Constant::CompileTimeEnvironment`].
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/// Or `index` is greater or equal to length of `constants`.
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pub(crate) fn constant_compile_time_environment( |
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&self, |
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index: usize, |
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) -> Rc<CompileTimeEnvironment> { |
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if let Some(Constant::CompileTimeEnvironment(value)) = self.constants.get(index) { |
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return value.clone(); |
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} |
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panic!("expected compile time environment constant at index {index}") |
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} |
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} |
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/// ---- `CodeBlock` private API ----
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@ -325,11 +368,11 @@ impl CodeBlock {
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pattern_index: source_index, |
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flags_index: flag_index, |
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} => { |
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let pattern = self.names[source_index.value() as usize] |
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.clone() |
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let pattern = self |
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.constant_string(source_index.value() as usize) |
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.to_std_string_escaped(); |
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let flags = self.names[flag_index.value() as usize] |
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.clone() |
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let flags = self |
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.constant_string(flag_index.value() as usize) |
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.to_std_string_escaped(); |
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format!("/{pattern}/{flags}") |
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} |
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@ -383,8 +426,8 @@ impl CodeBlock {
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let index = index.value() as usize; |
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format!( |
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"{index:04}: '{}' (length: {}), method: {method}", |
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self.functions[index].name().to_std_string_escaped(), |
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self.functions[index].length |
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self.constant_function(index).name().to_std_string_escaped(), |
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self.constant_function(index).length |
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) |
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} |
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Instruction::GetArrowFunction { index } |
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@ -394,8 +437,8 @@ impl CodeBlock {
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let index = index.value() as usize; |
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format!( |
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"{index:04}: '{}' (length: {})", |
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self.functions[index].name().to_std_string_escaped(), |
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self.functions[index].length |
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self.constant_function(index).name().to_std_string_escaped(), |
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self.constant_function(index).length |
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) |
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} |
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Instruction::DefVar { index } |
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@ -440,7 +483,8 @@ impl CodeBlock {
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format!( |
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"{:04}: '{}'", |
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index.value(), |
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self.names[index.value() as usize].to_std_string_escaped(), |
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self.constant_string(index.value() as usize) |
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.to_std_string_escaped(), |
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) |
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} |
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Instruction::PushPrivateEnvironment { name_indices } => { |
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@ -693,17 +737,34 @@ impl ToInternedString for CodeBlock {
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count += 1; |
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} |
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f.push_str("\nLiterals:\n"); |
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f.push_str("\nConstants:"); |
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if self.literals.is_empty() { |
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if self.constants.is_empty() { |
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f.push_str(" <empty>\n"); |
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} else { |
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for (i, value) in self.literals.iter().enumerate() { |
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f.push_str(&format!( |
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" {i:04}: <{}> {}\n", |
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value.type_of(), |
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value.display() |
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)); |
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f.push('\n'); |
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for (i, value) in self.constants.iter().enumerate() { |
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f.push_str(&format!(" {i:04}: ")); |
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let value = match value { |
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Constant::String(v) => { |
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format!("[STRING] \"{}\"", v.to_std_string_escaped().escape_debug()) |
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} |
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Constant::BigInt(v) => format!("[BIGINT] {v}n"), |
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Constant::Function(code) => format!( |
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"[FUNCTION] name: '{}' (length: {})\n", |
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code.name().to_std_string_escaped(), |
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code.length |
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), |
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Constant::CompileTimeEnvironment(v) => { |
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format!( |
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"[ENVIRONMENT] index: {}, bindings: {}", |
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v.environment_index(), |
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v.num_bindings() |
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) |
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} |
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}; |
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f.push_str(&value); |
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f.push('\n'); |
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} |
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} |
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@ -719,19 +780,6 @@ impl ToInternedString for CodeBlock {
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} |
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} |
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f.push_str("\nFunctions:\n"); |
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if self.functions.is_empty() { |
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f.push_str(" <empty>\n"); |
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} else { |
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for (i, code) in self.functions.iter().enumerate() { |
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f.push_str(&format!( |
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" {i:04}: name: '{}' (length: {})\n", |
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code.name().to_std_string_escaped(), |
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code.length |
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)); |
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} |
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} |
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f.push_str("\nHandlers:\n"); |
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if self.handlers.is_empty() { |
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f.push_str(" <empty>\n"); |
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Haled Odat
1 year ago
committed by
GitHub