mirror of
https://github.com/pjh456/OxideJS.git
synced 2026-10-23 18:21:13 +08:00
752 lines
36 KiB
Rust
752 lines
36 KiB
Rust
//! emit 前置 pass：builtin 引用预扫描 + 声明预登记。
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//!
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//! 在生成临时寄存器前遍历 AST，把内置全局标识符预先登记到固定寄存器槽
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//! （builtin_reg_map），避免与临时寄存器池冲突；同时预声明函数/var 声明，
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//! 支持提升语义。
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use crate::{CompileCtx, Emitter};
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use oxide_parser::{
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BindingPattern, Declaration, ExportDefaultDeclarationKind, Expression, Statement, VariableDeclarationKind,
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};
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/// 脚本顶层 lexical 声明（let/const/class）禁止使用的受限全局名：3 名静态集。
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/// 受限判定走规范自有属性臂：全局对象上 {configurable:false} 自有属性名（声明
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/// 实例化无法建立遮蔽绑定）——现行规范下恰为三常量；eval 与各 builtin 属性皆
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/// 可配置（合法遮蔽），不在此列。名基静态集（编译期不可查运行时描述符）。与
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/// BUILTIN_GLOBALS 语义不同（后者是 put 写拦截/双写名单），不互相派生，交叠
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/// 名由漂移守卫单测断言恒同步。
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pub(crate) const RESTRICTED_GLOBAL_LEXICAL_NAMES: &[&str] = &["undefined", "NaN", "Infinity"];
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/// 脚本顶层 lexical 声明撞受限全局名 → SyntaxError（声明实例化期拒绝，整程序
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/// 编译失败）。错误消息与既有重复声明错同形；非顶层或名不在受限集 → Ok。
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fn check_restricted_global_lexical(name: &str, global_lexical: bool) -> Result<(), String> {
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if global_lexical && RESTRICTED_GLOBAL_LEXICAL_NAMES.contains(&name) {
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return Err(format!("Identifier '{name}' has already been declared"));
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}
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Ok(())
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}
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impl Emitter {
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/// 在临时寄存器池之前分配 builtin 槽位。
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pub(crate) fn pre_register_builtin_references(&self, stmts: &[Statement], ctx: &mut CompileCtx) {
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for stmt in stmts {
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self.pre_scan_builtin_stmt(stmt, ctx);
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}
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}
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fn pre_scan_builtin_stmt(&self, stmt: &Statement, ctx: &mut CompileCtx) {
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match stmt {
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Statement::ExpressionStatement(es) => self.pre_scan_builtin_expr(&es.expression, ctx),
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Statement::VariableDeclaration(vd) => {
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for d in &vd.declarations {
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self.pre_scan_builtin_pattern(&d.id, ctx);
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if let Some(init) = &d.init {
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self.pre_scan_builtin_expr(init, ctx);
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}
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}
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}
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Statement::ReturnStatement(rs) => {
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if let Some(a) = &rs.argument {
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self.pre_scan_builtin_expr(a, ctx);
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}
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}
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Statement::IfStatement(is) => {
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self.pre_scan_builtin_expr(&is.test, ctx);
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self.pre_scan_builtin_stmt(&is.consequent, ctx);
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if let Some(alt) = &is.alternate {
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self.pre_scan_builtin_stmt(alt, ctx);
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}
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}
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Statement::WhileStatement(wh) => {
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self.pre_scan_builtin_expr(&wh.test, ctx);
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self.pre_scan_builtin_stmt(&wh.body, ctx);
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}
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Statement::DoWhileStatement(dw) => {
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self.pre_scan_builtin_stmt(&dw.body, ctx);
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self.pre_scan_builtin_expr(&dw.test, ctx);
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}
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Statement::ForStatement(fs) => {
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if let Some(init) = &fs.init {
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if let Some(e) = init.as_expression() {
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self.pre_scan_builtin_expr(e, ctx);
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} else if let oxide_parser::ForStatementInit::VariableDeclaration(decl) = init {
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for d in &decl.declarations {
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self.pre_scan_builtin_pattern(&d.id, ctx);
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if let Some(init_expr) = &d.init {
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self.pre_scan_builtin_expr(init_expr, ctx);
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}
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}
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}
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}
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if let Some(t) = &fs.test {
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self.pre_scan_builtin_expr(t, ctx);
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}
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if let Some(u) = &fs.update {
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self.pre_scan_builtin_expr(u, ctx);
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}
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self.pre_scan_builtin_stmt(&fs.body, ctx);
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}
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Statement::ForInStatement(fi) => {
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if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = &fi.left {
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for d in &vd.declarations {
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self.pre_scan_builtin_pattern(&d.id, ctx);
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}
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}
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self.pre_scan_builtin_expr(&fi.right, ctx);
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self.pre_scan_builtin_stmt(&fi.body, ctx);
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}
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Statement::ForOfStatement(fo) => {
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if let oxide_parser::ForStatementLeft::VariableDeclaration(vd) = &fo.left {
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for d in &vd.declarations {
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self.pre_scan_builtin_pattern(&d.id, ctx);
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}
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}
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self.pre_scan_builtin_expr(&fo.right, ctx);
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self.pre_scan_builtin_stmt(&fo.body, ctx);
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}
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Statement::SwitchStatement(sw) => {
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self.pre_scan_builtin_expr(&sw.discriminant, ctx);
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for case in &sw.cases {
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if let Some(test) = &case.test {
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self.pre_scan_builtin_expr(test, ctx);
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}
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for s in &case.consequent {
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self.pre_scan_builtin_stmt(s, ctx);
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}
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}
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}
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Statement::ThrowStatement(ts) => {
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self.pre_scan_builtin_expr(&ts.argument, ctx);
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}
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Statement::TryStatement(ts) => {
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for s in &ts.block.body {
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self.pre_scan_builtin_stmt(s, ctx);
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}
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if let Some(handler) = &ts.handler {
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if let Some(param) = &handler.param {
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self.pre_scan_builtin_pattern(¶m.pattern, ctx);
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}
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for s in &handler.body.body {
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self.pre_scan_builtin_stmt(s, ctx);
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}
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}
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if let Some(finalizer) = &ts.finalizer {
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for s in &finalizer.body {
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self.pre_scan_builtin_stmt(s, ctx);
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}
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}
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}
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Statement::BlockStatement(bs) => {
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for s in &bs.body {
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self.pre_scan_builtin_stmt(s, ctx);
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}
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}
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Statement::LabeledStatement(ls) => self.pre_scan_builtin_stmt(&ls.body, ctx),
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Statement::WithStatement(ws) => {
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self.pre_scan_builtin_expr(&ws.object, ctx);
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self.pre_scan_builtin_stmt(&ws.body, ctx);
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}
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Statement::ClassDeclaration(cd) => {
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if let Some(super_class) = &cd.super_class {
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self.pre_scan_builtin_expr(super_class, ctx);
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}
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}
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Statement::ExportNamedDeclaration(exp) => {
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if let Some(Declaration::VariableDeclaration(vd)) = &exp.declaration {
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for d in &vd.declarations {
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self.pre_scan_builtin_pattern(&d.id, ctx);
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if let Some(init) = &d.init {
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self.pre_scan_builtin_expr(init, ctx);
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}
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}
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}
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}
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Statement::ExportDefaultDeclaration(exp) => {
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if let Some(e) = exp.declaration.as_expression() {
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self.pre_scan_builtin_expr(e, ctx);
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}
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}
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Statement::FunctionDeclaration(_) | Statement::BreakStatement(_) | Statement::ContinueStatement(_) => {}
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_ => {}
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}
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}
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fn pre_scan_builtin_expr(&self, expr: &Expression, ctx: &mut CompileCtx) {
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match expr {
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Expression::Identifier(ident) => {
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if CompileCtx::is_known_builtin(ident.name.as_str()) {
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let _ = ctx.lookup_or_builtin(ident.name.as_str());
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}
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}
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Expression::BinaryExpression(bin) => {
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self.pre_scan_builtin_expr(&bin.left, ctx);
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self.pre_scan_builtin_expr(&bin.right, ctx);
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}
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Expression::UnaryExpression(un) => {
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self.pre_scan_builtin_expr(&un.argument, ctx);
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}
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Expression::CallExpression(call) => {
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self.pre_scan_builtin_expr(&call.callee, ctx);
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for arg in &call.arguments {
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self.pre_scan_builtin_arg(arg, ctx);
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}
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}
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Expression::NewExpression(ne) => {
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self.pre_scan_builtin_expr(&ne.callee, ctx);
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for arg in &ne.arguments {
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self.pre_scan_builtin_arg(arg, ctx);
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}
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}
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Expression::LogicalExpression(log) => {
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self.pre_scan_builtin_expr(&log.left, ctx);
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self.pre_scan_builtin_expr(&log.right, ctx);
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}
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Expression::ConditionalExpression(cond) => {
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self.pre_scan_builtin_expr(&cond.test, ctx);
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self.pre_scan_builtin_expr(&cond.consequent, ctx);
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self.pre_scan_builtin_expr(&cond.alternate, ctx);
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}
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Expression::PrivateInExpression(pin) => {
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self.pre_scan_builtin_expr(&pin.right, ctx);
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}
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Expression::SequenceExpression(seq) => {
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for e in &seq.expressions {
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self.pre_scan_builtin_expr(e, ctx);
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}
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}
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Expression::AssignmentExpression(assign) => {
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if let Some(target) = assign.left.as_simple_assignment_target() {
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self.pre_scan_builtin_target(target, ctx);
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}
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self.pre_scan_builtin_expr(&assign.right, ctx);
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}
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Expression::UpdateExpression(update) => {
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self.pre_scan_builtin_target(&update.argument, ctx);
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}
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Expression::TemplateLiteral(tl) => {
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for e in &tl.expressions {
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self.pre_scan_builtin_expr(e, ctx);
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}
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}
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Expression::TaggedTemplateExpression(tt) => {
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self.pre_scan_builtin_expr(&tt.tag, ctx);
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for e in &tt.quasi.expressions {
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self.pre_scan_builtin_expr(e, ctx);
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}
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}
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Expression::ObjectExpression(obj) => {
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for prop in &obj.properties {
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match prop {
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oxide_parser::ObjectPropertyKind::ObjectProperty(p) => {
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if p.computed {
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self.pre_scan_builtin_expr(p.key.to_expression(), ctx);
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}
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self.pre_scan_builtin_expr(&p.value, ctx);
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}
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oxide_parser::ObjectPropertyKind::SpreadProperty(spread) => {
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self.pre_scan_builtin_expr(&spread.argument, ctx);
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}
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}
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}
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}
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Expression::ArrayExpression(arr) => {
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for e in &arr.elements {
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if let Some(e) = e.as_expression() {
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self.pre_scan_builtin_expr(e, ctx);
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}
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}
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}
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Expression::PrivateFieldExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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}
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Expression::StaticMemberExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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}
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Expression::ComputedMemberExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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self.pre_scan_builtin_expr(&member.expression, ctx);
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}
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Expression::ChainExpression(chain) => {
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self.pre_scan_builtin_chain(&chain.expression, ctx);
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}
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Expression::ParenthesizedExpression(p) => self.pre_scan_builtin_expr(&p.expression, ctx),
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Expression::YieldExpression(ye) => {
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if let Some(a) = &ye.argument {
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self.pre_scan_builtin_expr(a, ctx);
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}
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}
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Expression::AwaitExpression(ae) => self.pre_scan_builtin_expr(&ae.argument, ctx),
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Expression::ArrowFunctionExpression(_)
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| Expression::FunctionExpression(_)
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| Expression::ClassExpression(_) => {}
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_ => {}
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}
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}
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fn pre_scan_builtin_target(&self, target: &oxide_parser::SimpleAssignmentTarget, ctx: &mut CompileCtx) {
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match target {
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oxide_parser::SimpleAssignmentTarget::AssignmentTargetIdentifier(id) => {
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// 标识符目标与表达式位置标识符引用同口径预登记：目标为某内置名的
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// 唯一出现处（无读侧引用）时缺预登记会解析成隐式全局新槽，旧值读
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// 与短路判定拿到未预载值。
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if CompileCtx::is_known_builtin(id.name.as_str()) {
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let _ = ctx.lookup_or_builtin(id.name.as_str());
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}
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}
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oxide_parser::SimpleAssignmentTarget::StaticMemberExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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}
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oxide_parser::SimpleAssignmentTarget::ComputedMemberExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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self.pre_scan_builtin_expr(&member.expression, ctx);
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}
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oxide_parser::SimpleAssignmentTarget::PrivateFieldExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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}
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_ => {}
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}
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}
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fn pre_scan_builtin_chain(&self, element: &oxide_parser::ChainElement, ctx: &mut CompileCtx) {
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match element {
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oxide_parser::ChainElement::StaticMemberExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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}
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oxide_parser::ChainElement::ComputedMemberExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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self.pre_scan_builtin_expr(&member.expression, ctx);
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}
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oxide_parser::ChainElement::PrivateFieldExpression(member) => {
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self.pre_scan_builtin_expr(&member.object, ctx);
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}
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oxide_parser::ChainElement::CallExpression(call) => {
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self.pre_scan_builtin_expr(&call.callee, ctx);
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for arg in &call.arguments {
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self.pre_scan_builtin_arg(arg, ctx);
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}
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}
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_ => {}
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}
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}
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/// 遍历调用实参：spread 内部表达式也纳入 builtin 预扫描。
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fn pre_scan_builtin_arg(&self, arg: &oxide_parser::Argument, ctx: &mut CompileCtx) {
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if let Some(e) = arg.as_expression() {
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self.pre_scan_builtin_expr(e, ctx);
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} else if let oxide_parser::Argument::SpreadElement(sp) = arg {
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self.pre_scan_builtin_expr(&sp.argument, ctx);
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}
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}
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/// 遍历绑定 pattern 的计算键表达式（`{[k]: a}` 的键）里的 builtin 引用：
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/// 模式键是运行时求值表达式，键内 builtin 标识符须预先登记固定槽位
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/// （与对象字面量计算键预扫描同口径）。
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fn pre_scan_builtin_pattern(&self, pattern: &BindingPattern, ctx: &mut CompileCtx) {
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match pattern {
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BindingPattern::BindingIdentifier(_) => {}
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BindingPattern::ArrayPattern(ap) => {
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for e in ap.elements.iter().flatten() {
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self.pre_scan_builtin_pattern(e, ctx);
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}
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if let Some(rest) = &ap.rest {
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self.pre_scan_builtin_pattern(&rest.argument, ctx);
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}
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}
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BindingPattern::ObjectPattern(op) => {
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for prop in &op.properties {
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if prop.computed {
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self.pre_scan_builtin_expr(prop.key.to_expression(), ctx);
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}
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self.pre_scan_builtin_pattern(&prop.value, ctx);
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}
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if let Some(rest) = &op.rest {
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self.pre_scan_builtin_pattern(&rest.argument, ctx);
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}
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}
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BindingPattern::AssignmentPattern(ap) => {
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self.pre_scan_builtin_pattern(&ap.left, ctx);
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}
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}
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}
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pub(crate) fn predeclare_function_declarations(&self, statements: &[Statement], ctx: &mut CompileCtx) {
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for statement in statements {
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let function = match statement {
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Statement::FunctionDeclaration(f) => f,
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Statement::ExportNamedDeclaration(exp) => match &exp.declaration {
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Some(Declaration::FunctionDeclaration(f)) => f,
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_ => continue,
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},
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// export default function foo(){}：foo 绑定由 lexical predeclare 以
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// Const 预声明（emit 侧 emit_bind_target(Const) 消费预登记槽）。
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_ => continue,
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};
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let Some(identifier) = &function.id else {
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continue;
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};
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let reg = ctx.alloc_reg();
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let _ = ctx.declare_initialized(identifier.name.as_str(), reg, VariableDeclarationKind::Var, false);
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}
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}
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/// 预声明单个 `var` 名：仅顶层（全局作用域）的 builtin 名落 builtin 镜像槽
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/// （run 起点预载全局属性值），使 GDI 序言与声明点同步都用入口原值而非
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/// fresh undefined 槽，现存值（NaN 等）不被抹；函数体内 builtin 名仍是局部
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/// var 遮蔽（fresh 槽，不命中只读内置拦截）；其余名 fresh var 槽。
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fn predeclare_var_name(&self, name: &str, ctx: &mut CompileCtx) {
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if ctx.is_global_scope && CompileCtx::is_known_builtin(name) {
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let _ = ctx.lookup_or_builtin(name);
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} else {
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let reg = ctx.alloc_reg();
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let _ = ctx.declare_initialized(name, reg, VariableDeclarationKind::Var, false);
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}
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}
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/// 预声明语句列表中的全部 `var` 绑定，使先发的提升函数声明能解析它们。
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/// 顶层 `var` 名在编译闭包捕获它的函数体时必须可见。
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pub(crate) fn predeclare_var_declarations(&self, statements: &[Statement], ctx: &mut CompileCtx) {
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for statement in statements {
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match statement {
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Statement::VariableDeclaration(decl) => {
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if !matches!(decl.kind, VariableDeclarationKind::Var) {
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continue;
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}
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for d in &decl.declarations {
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if let oxide_parser::BindingPattern::BindingIdentifier(bi) = &d.id {
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self.predeclare_var_name(bi.name.as_str(), ctx);
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}
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}
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}
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Statement::BlockStatement(bs) => self.predeclare_var_declarations(&bs.body, ctx),
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||
Statement::IfStatement(is) => {
|
||
self.predeclare_var_declarations(std::slice::from_ref(&is.consequent), ctx);
|
||
if let Some(alt) = &is.alternate {
|
||
self.predeclare_var_declarations(std::slice::from_ref(alt), ctx);
|
||
}
|
||
}
|
||
Statement::WhileStatement(wh) => {
|
||
self.predeclare_var_declarations(std::slice::from_ref(&wh.body), ctx);
|
||
}
|
||
Statement::DoWhileStatement(dw) => {
|
||
self.predeclare_var_declarations(std::slice::from_ref(&dw.body), ctx);
|
||
}
|
||
Statement::ForStatement(fs) => {
|
||
if let Some(oxide_parser::ForStatementInit::VariableDeclaration(decl)) = &fs.init {
|
||
if matches!(decl.kind, VariableDeclarationKind::Var) {
|
||
for d in &decl.declarations {
|
||
if let oxide_parser::BindingPattern::BindingIdentifier(bi) = &d.id {
|
||
self.predeclare_var_name(bi.name.as_str(), ctx);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
self.predeclare_var_declarations(std::slice::from_ref(&fs.body), ctx);
|
||
}
|
||
Statement::ForInStatement(fi) => {
|
||
// var 头名提升到函数/全局作用域（与 For 臂同规则），先于提升
|
||
// 函数声明发射预声明，使函数体按既有 var 绑定解析头名；
|
||
// let/const 头是迭代级绑定，不入提升面。
|
||
if let oxide_parser::ForStatementLeft::VariableDeclaration(decl) = &fi.left {
|
||
if matches!(decl.kind, VariableDeclarationKind::Var) {
|
||
for d in &decl.declarations {
|
||
if let oxide_parser::BindingPattern::BindingIdentifier(bi) = &d.id {
|
||
self.predeclare_var_name(bi.name.as_str(), ctx);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
self.predeclare_var_declarations(std::slice::from_ref(&fi.body), ctx);
|
||
}
|
||
Statement::ForOfStatement(fo) => {
|
||
if let oxide_parser::ForStatementLeft::VariableDeclaration(decl) = &fo.left {
|
||
if matches!(decl.kind, VariableDeclarationKind::Var) {
|
||
for d in &decl.declarations {
|
||
if let oxide_parser::BindingPattern::BindingIdentifier(bi) = &d.id {
|
||
self.predeclare_var_name(bi.name.as_str(), ctx);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
self.predeclare_var_declarations(std::slice::from_ref(&fo.body), ctx);
|
||
}
|
||
Statement::SwitchStatement(sw) => {
|
||
for case in &sw.cases {
|
||
self.predeclare_var_declarations(&case.consequent, ctx);
|
||
}
|
||
}
|
||
Statement::TryStatement(ts) => {
|
||
self.predeclare_var_declarations(&ts.block.body, ctx);
|
||
if let Some(handler) = &ts.handler {
|
||
self.predeclare_var_declarations(&handler.body.body, ctx);
|
||
}
|
||
if let Some(finalizer) = &ts.finalizer {
|
||
self.predeclare_var_declarations(&finalizer.body, ctx);
|
||
}
|
||
}
|
||
Statement::LabeledStatement(ls) => {
|
||
self.predeclare_var_declarations(std::slice::from_ref(&ls.body), ctx);
|
||
}
|
||
Statement::WithStatement(ws) => {
|
||
self.predeclare_var_declarations(std::slice::from_ref(&ws.body), ctx);
|
||
}
|
||
Statement::ExportNamedDeclaration(exp) => {
|
||
if let Some(Declaration::VariableDeclaration(decl)) = &exp.declaration {
|
||
if !matches!(decl.kind, VariableDeclarationKind::Var) {
|
||
continue;
|
||
}
|
||
for d in &decl.declarations {
|
||
if let oxide_parser::BindingPattern::BindingIdentifier(bi) = &d.id {
|
||
self.predeclare_var_name(bi.name.as_str(), ctx);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
_ => {}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// 预声明当前块直接子树中的函数声明（ES2015 块级绑定，kind=Let 落当前块），
|
||
/// 使块内声明点之前的引用在编译期可见。递归进入嵌套块时压/弹作用域，
|
||
/// 与 emit 阶段嵌套块 push_scope 的时机对齐。
|
||
///
|
||
/// # 边界与前提
|
||
/// - 只处理块内函数声明；switch 不推 scope（其 case 内函数声明随 switch
|
||
/// 作用域修复一并处理）；export 声明不可能出现在块内。
|
||
/// - 与 lexical 预声明的顺序：本函数在前，`{ let g; function g(){} }` 时
|
||
/// lexical 的 `declare_predeclared` 命中已存在的函数绑定自然报重复声明错，
|
||
/// 避免函数预声明被 lexical 占位静默覆盖而破坏 let 的 TDZ。
|
||
/// - var 与函数同名（`{ var g; function g(){} }`）：var 落函数作用域、
|
||
/// 函数落当前块，不同 scope 互不冲突。
|
||
pub(crate) fn predeclare_block_function_declarations(&self, statements: &[Statement], ctx: &mut CompileCtx) {
|
||
for statement in statements {
|
||
match statement {
|
||
Statement::FunctionDeclaration(f) => {
|
||
let Some(identifier) = &f.id else {
|
||
continue;
|
||
};
|
||
let reg = ctx.alloc_reg();
|
||
let _ = ctx.declare_initialized(identifier.name.as_str(), reg, VariableDeclarationKind::Let, false);
|
||
}
|
||
Statement::BlockStatement(bs) => {
|
||
ctx.push_scope();
|
||
self.predeclare_block_function_declarations(&bs.body, ctx);
|
||
ctx.pop_scope();
|
||
}
|
||
Statement::IfStatement(is) => {
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(&is.consequent), ctx);
|
||
if let Some(alt) = &is.alternate {
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(alt), ctx);
|
||
}
|
||
}
|
||
Statement::WhileStatement(wh) => {
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(&wh.body), ctx);
|
||
}
|
||
Statement::DoWhileStatement(dw) => {
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(&dw.body), ctx);
|
||
}
|
||
Statement::ForStatement(fs) => {
|
||
// 循环推独立作用域（头声明所在），函数声明落该作用域与 emit 对齐。
|
||
ctx.push_scope();
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(&fs.body), ctx);
|
||
ctx.pop_scope();
|
||
}
|
||
Statement::ForInStatement(fi) => {
|
||
ctx.push_scope();
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(&fi.body), ctx);
|
||
ctx.pop_scope();
|
||
}
|
||
Statement::ForOfStatement(fo) => {
|
||
ctx.push_scope();
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(&fo.body), ctx);
|
||
ctx.pop_scope();
|
||
}
|
||
Statement::TryStatement(ts) => {
|
||
ctx.push_scope();
|
||
self.predeclare_block_function_declarations(&ts.block.body, ctx);
|
||
ctx.pop_scope();
|
||
if let Some(handler) = &ts.handler {
|
||
ctx.push_scope();
|
||
self.predeclare_block_function_declarations(&handler.body.body, ctx);
|
||
ctx.pop_scope();
|
||
}
|
||
if let Some(finalizer) = &ts.finalizer {
|
||
ctx.push_scope();
|
||
self.predeclare_block_function_declarations(&finalizer.body, ctx);
|
||
ctx.pop_scope();
|
||
}
|
||
}
|
||
Statement::LabeledStatement(ls) => {
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(&ls.body), ctx);
|
||
}
|
||
Statement::WithStatement(ws) => {
|
||
self.predeclare_block_function_declarations(std::slice::from_ref(&ws.body), ctx);
|
||
}
|
||
_ => {}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// 预声明当前作用域直接子语句中的 `let`/`const`/`class` 绑定（未初始化，
|
||
/// 建立 TDZ 占位）。使声明点之前的读取在编译期可分辨为 TDZ 而非隐式全局，
|
||
/// 声明点复用预登记槽位。
|
||
///
|
||
/// # 边界与前提
|
||
/// - 只扫描直接子语句 + 递归 switch case（switch 不推 scope，case 内 lexical
|
||
/// 声明属于外层作用域）；不递归块/if/for/while body（嵌套块自预声明；
|
||
/// 单语句 body 不接受 lexical 声明——lexical 属 Declaration、非 Statement
|
||
/// 子产生式，parser 按语法错误直接拒绝，这些形状不会进入 emit）。
|
||
/// - 跳过 for 头声明（循环作用域由 for 分支内联 declare）。
|
||
/// - `global_lexical` 为 true 时（仅脚本顶层调用点传 `!is_eval_script`）：
|
||
/// lexical 声明撞受限全局名报 SyntaxError（脚本声明实例化对全局对象受限
|
||
/// 自有属性名做检查，eval 代码声明实例化无此检查）；函数体/块/try/模块
|
||
/// 调用点传 false，lexical 声明是局部绑定不查。
|
||
pub(crate) fn predeclare_lexical_declarations(
|
||
&self, statements: &[Statement], ctx: &mut CompileCtx, global_lexical: bool,
|
||
) -> Result<(), String> {
|
||
for statement in statements {
|
||
match statement {
|
||
Statement::VariableDeclaration(decl) => {
|
||
if matches!(decl.kind, VariableDeclarationKind::Var) {
|
||
continue;
|
||
}
|
||
let is_const = matches!(decl.kind, VariableDeclarationKind::Const);
|
||
for d in &decl.declarations {
|
||
self.predeclare_lexical_pattern(&d.id, is_const, ctx, global_lexical)?;
|
||
}
|
||
}
|
||
Statement::ClassDeclaration(cd) => {
|
||
if let Some(id) = &cd.id {
|
||
check_restricted_global_lexical(id.name.as_str(), global_lexical)?;
|
||
let reg = ctx.alloc_reg();
|
||
let _ = ctx.declare_predeclared(id.name.as_str(), reg, VariableDeclarationKind::Const, true);
|
||
}
|
||
}
|
||
Statement::SwitchStatement(sw) => {
|
||
for case in &sw.cases {
|
||
for s in &case.consequent {
|
||
self.predeclare_lexical_stmt(s, ctx, global_lexical)?;
|
||
}
|
||
}
|
||
}
|
||
Statement::ExportNamedDeclaration(exp) => {
|
||
if let Some(decl) = &exp.declaration {
|
||
match decl {
|
||
Declaration::VariableDeclaration(vd) => {
|
||
if matches!(vd.kind, VariableDeclarationKind::Var) {
|
||
continue;
|
||
}
|
||
let is_const = matches!(vd.kind, VariableDeclarationKind::Const);
|
||
for d in &vd.declarations {
|
||
self.predeclare_lexical_pattern(&d.id, is_const, ctx, global_lexical)?;
|
||
}
|
||
}
|
||
Declaration::ClassDeclaration(cd) => {
|
||
if let Some(id) = &cd.id {
|
||
check_restricted_global_lexical(id.name.as_str(), global_lexical)?;
|
||
let reg = ctx.alloc_reg();
|
||
let _ = ctx.declare_predeclared(
|
||
id.name.as_str(),
|
||
reg,
|
||
VariableDeclarationKind::Const,
|
||
true,
|
||
);
|
||
}
|
||
}
|
||
_ => {}
|
||
}
|
||
}
|
||
}
|
||
Statement::ExportDefaultDeclaration(exp) => match &exp.declaration {
|
||
ExportDefaultDeclarationKind::ClassDeclaration(cd) => {
|
||
if let Some(id) = &cd.id {
|
||
check_restricted_global_lexical(id.name.as_str(), global_lexical)?;
|
||
let reg = ctx.alloc_reg();
|
||
let _ =
|
||
ctx.declare_predeclared(id.name.as_str(), reg, VariableDeclarationKind::Const, true);
|
||
}
|
||
}
|
||
ExportDefaultDeclarationKind::FunctionDeclaration(fd) => {
|
||
if let Some(id) = &fd.id {
|
||
let reg = ctx.alloc_reg();
|
||
let _ =
|
||
ctx.declare_predeclared(id.name.as_str(), reg, VariableDeclarationKind::Const, true);
|
||
}
|
||
}
|
||
_ => {}
|
||
},
|
||
_ => {}
|
||
}
|
||
}
|
||
Ok(())
|
||
}
|
||
|
||
/// 预声明单个语句中的 lexical 声明（供 switch case 递归；`let`/`const`/`class` 分支）。
|
||
fn predeclare_lexical_stmt(
|
||
&self, stmt: &Statement, ctx: &mut CompileCtx, global_lexical: bool,
|
||
) -> Result<(), String> {
|
||
match stmt {
|
||
Statement::VariableDeclaration(decl) => {
|
||
if matches!(decl.kind, VariableDeclarationKind::Var) {
|
||
return Ok(());
|
||
}
|
||
let is_const = matches!(decl.kind, VariableDeclarationKind::Const);
|
||
for d in &decl.declarations {
|
||
self.predeclare_lexical_pattern(&d.id, is_const, ctx, global_lexical)?;
|
||
}
|
||
}
|
||
Statement::ClassDeclaration(cd) => {
|
||
if let Some(id) = &cd.id {
|
||
check_restricted_global_lexical(id.name.as_str(), global_lexical)?;
|
||
let reg = ctx.alloc_reg();
|
||
let _ = ctx.declare_predeclared(id.name.as_str(), reg, VariableDeclarationKind::Const, true);
|
||
}
|
||
}
|
||
_ => {}
|
||
}
|
||
Ok(())
|
||
}
|
||
|
||
/// 递归预声明绑定 pattern 内的全部标识符（含数组/对象/默认值解构）。
|
||
fn predeclare_lexical_pattern(
|
||
&self, pattern: &BindingPattern, is_const: bool, ctx: &mut CompileCtx, global_lexical: bool,
|
||
) -> Result<(), String> {
|
||
match pattern {
|
||
BindingPattern::BindingIdentifier(bi) => {
|
||
check_restricted_global_lexical(bi.name.as_str(), global_lexical)?;
|
||
let reg = ctx.alloc_reg();
|
||
let _ = ctx.declare_predeclared(
|
||
bi.name.as_str(),
|
||
reg,
|
||
if is_const {
|
||
VariableDeclarationKind::Const
|
||
} else {
|
||
VariableDeclarationKind::Let
|
||
},
|
||
is_const,
|
||
);
|
||
}
|
||
BindingPattern::ArrayPattern(ap) => {
|
||
for e in ap.elements.iter().flatten() {
|
||
self.predeclare_lexical_pattern(e, is_const, ctx, global_lexical)?;
|
||
}
|
||
if let Some(rest) = &ap.rest {
|
||
self.predeclare_lexical_pattern(&rest.argument, is_const, ctx, global_lexical)?;
|
||
}
|
||
}
|
||
BindingPattern::ObjectPattern(op) => {
|
||
for prop in &op.properties {
|
||
self.predeclare_lexical_pattern(&prop.value, is_const, ctx, global_lexical)?;
|
||
}
|
||
if let Some(rest) = &op.rest {
|
||
self.predeclare_lexical_pattern(&rest.argument, is_const, ctx, global_lexical)?;
|
||
}
|
||
}
|
||
BindingPattern::AssignmentPattern(ap) => {
|
||
self.predeclare_lexical_pattern(&ap.left, is_const, ctx, global_lexical)?;
|
||
}
|
||
}
|
||
Ok(())
|
||
}
|
||
}
|