爱特每羊队
1379 lines
57 KiB
Rust
1379 lines
57 KiB
Rust
//! emit：AST → IR 代码生成（parse → IR → bytecode 中段）。
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//!
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//! `Emitter` 提供各语法域的 emit_* 方法；核心状态集中在 `CompileCtx`：
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//! 执行流字段（insts/registers/constants/labels）平铺其上，标识符绑定与
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//! 闭包捕获分别下沉到 `SymbolTable` / `captured_bindings`。产出分域组合的
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//! `IRFunction`，由 `oxide_ir::lower` 降为 bytecode。
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use std::collections::{BTreeMap, HashMap, HashSet};
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use oxide_bytecode::module::UpvalueCapture;
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use oxide_bytecode::opcode::OpCode;
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use oxide_ir::inst::Inst;
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use oxide_ir::operand::{LabelId, Operand};
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use oxide_ir::IRFunction;
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/// 是否为匿名函数定义（剥括号）：函数/箭头/class 表达式。
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pub fn is_anonymous_function_definition(expr: &oxide_parser::Expression) -> bool {
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match expr {
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oxide_parser::Expression::ArrowFunctionExpression(_)
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| oxide_parser::Expression::FunctionExpression(_)
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| oxide_parser::Expression::ClassExpression(_) => true,
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oxide_parser::Expression::ParenthesizedExpression(p) => is_anonymous_function_definition(&p.expression),
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_ => false,
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}
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}
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use crate::emit_ctx::{LabelCtx, ScopeCtx};
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use crate::symbol_table::{Binding, ScopeKind, SymbolTable};
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/// 常量池项（bytecode module 类型）re-export，供调用方构造常量。
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pub use oxide_bytecode::module::Constant;
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/// 变量声明种类（var/let/const），re-export 自 parser。
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pub use oxide_parser::VariableDeclarationKind;
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/// AST 语法树节点与运算符类型，re-export 自 parser。
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pub use oxide_parser::{AssignmentOperator, BinaryOperator, Expression, Statement, UnaryOperator};
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/// 编译入口（marker 类型）。方法按语法域组织在 `impl Emitter` 中。
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pub struct Emitter;
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/// 判断 f64 是否为整数值且在 i32 范围内（整数常量编码用）。
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pub fn is_int_literal(value: f64) -> bool {
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value.fract() == 0.0 && value >= i32::MIN as f64 && value <= i32::MAX as f64
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}
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/// 判断表达式是否无副作用（字面量/标识符/纯二元运算等）。
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/// 用于可丢弃值的优化路径。
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/// 逻辑运算符快速路径的"无副作用"判定：仅字面量/标识符/this 读取安全。
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/// 算术表达式（`1 / a` 等）不得判为无副作用——对象操作数强转（ToNumber 触发
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/// valueOf/toString/getter）可能在运行期抛错，急切求值会破坏 `||`/`&&` 短路。
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pub fn is_side_effect_free(expr: &Expression) -> bool {
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let mut stack = vec![expr];
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while let Some(expr) = stack.pop() {
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match expr {
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Expression::NumericLiteral(_)
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| Expression::StringLiteral(_)
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| Expression::BooleanLiteral(_)
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| Expression::NullLiteral(_)
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| Expression::Identifier(_)
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| Expression::RegExpLiteral(_)
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| Expression::ThisExpression(_) => {}
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Expression::ParenthesizedExpression(p) => stack.push(&p.expression),
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_ => return false,
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}
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}
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true
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}
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const BUILTIN_GLOBALS: &[&str] = &[
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"NaN",
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"undefined",
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"Infinity",
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"globalThis",
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"Object",
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"Array",
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"String",
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"Number",
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"Boolean",
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"Function",
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"Error",
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"TypeError",
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"ReferenceError",
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"RangeError",
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"SyntaxError",
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"URIError",
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"EvalError",
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"Math",
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"JSON",
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"Promise",
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"AggregateError",
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"Date",
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"Set",
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"Map",
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"RegExp",
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"Symbol",
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"parseInt",
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"parseFloat",
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"isNaN",
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"isFinite",
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"Proxy",
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"WeakMap",
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"WeakSet",
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"WeakRef",
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"FinalizationRegistry",
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"Atomics",
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"SharedArrayBuffer",
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"ArrayBuffer",
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"DataView",
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"Iterator",
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"BigInt",
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"TypedArray",
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"Int8Array",
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"Uint8Array",
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"Uint8ClampedArray",
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"Int16Array",
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"Uint16Array",
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"Int32Array",
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"Uint32Array",
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"Float32Array",
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"Float64Array",
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"BigInt64Array",
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"BigUint64Array",
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"Reflect",
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"escape",
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"unescape",
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"encodeURI",
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"decodeURI",
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"encodeURIComponent",
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"decodeURIComponent",
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];
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pub(crate) struct FieldBuffer {
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pub(crate) insts: Vec<Inst>,
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pub(crate) labels: Vec<(LabelId, usize)>,
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}
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/// 标签语句作用域：编译期内登记 `break label` / `continue label` 的跳转目标。
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/// `continue_label` 仅在标签直接包裹迭代语句时存在。
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#[derive(Debug, Clone)]
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pub struct LabelScope {
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pub(crate) name: String,
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pub(crate) break_label: LabelId,
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pub(crate) continue_label: Option<LabelId>,
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/// 标签打开时嵌套的 finally 域数：break/continue 跨越 finally 的计数依据。
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pub(crate) finally_depth_at_open: usize,
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}
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/// 单函数编译上下文：执行流 + 作用域 + 闭包捕获的聚合状态。
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/// 指令、常量池、寄存器分配平铺于此，作用域/绑定见 `ScopeCtx`，跳转见 `LabelCtx`。
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pub struct CompileCtx {
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pub(crate) insts: Vec<Inst>,
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pub(crate) constants: Vec<Constant>,
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constant_map: HashMap<ConstantKey, u16>,
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next_reg: u32,
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pub(crate) max_regs: u32,
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reserved_reg_start: u32,
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pub(crate) labels: LabelCtx,
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pub(crate) scopes: ScopeCtx,
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pub(crate) nested: Vec<IRFunction>,
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/// 外层函数上下文中持有 `this` 的寄存器。
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/// 箭头函数用它捕获词法 `this`；顶层初始化为 254（约定 this 寄存器）。
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pub(crate) enclosing_this_reg: u8,
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pub(crate) in_derived_constructor: bool,
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pub(crate) in_instance_method: bool,
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pub(crate) in_static_method: bool,
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/// 本函数是否为生成器函数体（`function*`），`assemble_ir` 回写到 IR。
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pub(crate) is_generator: bool,
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/// 本函数是否为异步函数体（`async function` / async 箭头），`assemble_ir` 回写到 IR。
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pub(crate) is_async: bool,
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/// 是否为脚本顶层模块（emit_program 的根上下文）。顶层 var/function 声明需
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/// 同步写全局对象属性（脚本环境记录的 var 可经 globalThis 反射）；函数体为 false。
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pub(crate) is_global_scope: bool,
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pub(crate) static_block_this_reg: Option<u8>,
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pub(crate) field_buffer: Option<FieldBuffer>,
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/// 类构造器模块中 `@@field_keys` upvalue 下标（实例字段 computed key 数组）。
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/// 类定义期求值一次存入 cell，构造器经此 upvalue 读取。
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pub(crate) field_keys_uv: Option<u8>,
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/// 类定义期全部 computed key 数组寄存器（方法/静态字段阶段按 slot 读取）。
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pub(crate) class_keys_reg: Option<u32>,
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pub(crate) current_upvalue_captures: Vec<UpvalueCapture>,
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/// 本函数作用域声明的绑定名（参数 + 变量/函数声明，AST 收集，emit 前确定）。
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pub(crate) own_bindings: HashSet<String>,
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/// 本函数被嵌套函数捕获的绑定名 → cell_idx（名字排序分配，稳定跨 run）。
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/// 捕获判断（MAKE_CELL / CELL_GET / CELL_SET）与子函数 upvalue cell_idx 统一查此映射，
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/// 消除符号表时序依赖与 cell 索引错位。
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pub(crate) captured_bindings: BTreeMap<String, u8>,
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/// 函数 `length` 属性值：首个带默认值形参之前的形参数（rest 不计）。
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/// emit_params_prologue 前由编译入口从 param_specs 计算。
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pub(crate) function_length: u32,
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pub(crate) const_overflow: bool,
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/// with 语句作用域栈：元素为 (with 对象寄存器, 打开时的作用域深度)。
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/// 非空时 with 体内的自由标识符需动态解析（先查对象属性，回退外层）。
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pub(crate) with_stack: Vec<(u32, usize)>,
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/// 打开中（尚未 emit 对应 END）的 try handler 栈，自底向上镜像运行时
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/// try_stack 组成。每项标记是否为纯 catch handler（TRY_BEGIN，由 TRY_END
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/// 弹出）：return 逃出 try 域时据此弹出栈顶连续纯 catch，防 handler 泄漏。
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pub(crate) open_try_handlers: Vec<bool>,
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/// 循环 update 段中应走寄存器（而非 cell）的被捕获绑定名：C 风格 for 的
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/// let/const 循环变量每迭代 fresh cell，update 写寄存器（不污染本迭代闭包
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/// 捕获的 cell），下一迭代 fresh 从寄存器拷入新 cell。
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pub(crate) register_update_names: Vec<String>,
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}
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/// 函数体编译上下文：决定 `this`/`super` 绑定与参数前导（prologue）形态。
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#[derive(Clone, Copy)]
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pub enum FunctionBodyContext {
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/// 普通函数：自身 `this`、独立作用域。
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Ordinary,
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/// 箭头函数：词法捕获外层 `this`，不生成参数前导。
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Arrow,
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/// 类元素方法：按类语义处理 `super` 与 home object。
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ClassElement,
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}
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/// 参数规格：普通形参为标识符（可带默认值 initializer），解构形参用合成名 + 原始 pattern，
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/// rest 形参为数组（无默认值，只能是最末形参）。
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pub enum ParamSpec<'a> {
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Identifier {
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name: String,
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initializer: Option<&'a Expression<'a>>,
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},
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Pattern {
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synthetic_name: String,
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pattern: &'a oxide_parser::BindingPattern<'a>,
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initializer: Option<&'a Expression<'a>>,
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},
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Rest {
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name: String,
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},
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}
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impl ParamSpec<'_> {
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pub(crate) fn register_name(&self) -> &str {
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match self {
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Self::Identifier { name, .. } => name,
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Self::Pattern { synthetic_name, .. } => synthetic_name,
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Self::Rest { name } => name,
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}
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}
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}
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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enum ConstantKey {
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Number(u64),
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Int(i32),
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BigInt(i128),
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String(String),
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Boolean(bool),
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Null,
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Undefined,
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}
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impl CompileCtx {
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pub(crate) fn new() -> Self {
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Self {
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insts: Vec::new(),
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constants: Vec::new(),
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constant_map: HashMap::new(),
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next_reg: 1,
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max_regs: 1,
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reserved_reg_start: 1,
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labels: LabelCtx {
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label_pos: Vec::new(),
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loop_stack: Vec::new(),
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switch_stack: Vec::new(),
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label_scopes: Vec::new(),
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pending_loop_labels: Vec::new(),
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finally_depth: 0,
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label_counter: 0,
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},
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scopes: ScopeCtx {
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symbols: SymbolTable::new(),
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builtin_reg_map: Vec::new(),
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private_name_map: Vec::new(),
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private_element_kinds: Vec::new(),
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private_brand_id: None,
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next_private_name_id: 1,
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},
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nested: Vec::new(),
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enclosing_this_reg: 254, // conventional this register at top level
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in_derived_constructor: false,
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in_instance_method: false,
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in_static_method: false,
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is_generator: false,
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is_async: false,
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is_global_scope: false,
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static_block_this_reg: None,
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field_buffer: None,
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field_keys_uv: None,
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class_keys_reg: None,
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current_upvalue_captures: Vec::new(),
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own_bindings: HashSet::new(),
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captured_bindings: BTreeMap::new(),
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function_length: 0,
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const_overflow: false,
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with_stack: Vec::new(),
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open_try_handlers: Vec::new(),
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register_update_names: Vec::new(),
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}
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}
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pub(crate) fn inst(&mut self, inst: Inst) {
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self.insts.push(inst);
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}
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pub(crate) fn alloc_reg(&mut self) -> u32 {
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let r = self.next_reg;
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// vreg 化：寄存器号无上限，RegAlloc 阶段负责压缩到物理域（≤253）。
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// 254/255 是 VM 保留的 this/new.target，vreg 世界允许虚拟号越过它们，
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// 只有 RegAlloc 完成映射后 lower 的物理域检查才相关。
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self.next_reg += 1;
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if self.next_reg > self.max_regs {
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self.max_regs = self.next_reg;
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}
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r
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}
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pub(crate) fn reset_regs(&mut self) {
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self.next_reg = self.builtin_reg_floor().max(self.reserved_reg_start);
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self.labels.label_counter = 0;
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}
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pub(crate) fn reserve_reg(&mut self, reg: u32) {
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let next = reg.wrapping_add(1);
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if self.next_reg <= reg {
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self.next_reg = next;
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}
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if self.max_regs < next {
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self.max_regs = next;
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}
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}
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pub(crate) fn add_constant(&mut self, c: Constant) -> u16 {
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if let Some(key) = ConstantKey::from_constant(&c) {
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if let Some(&idx) = self.constant_map.get(&key) {
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return idx;
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}
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|
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if self.constants.len() >= u16::MAX as usize {
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self.const_overflow = true;
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return u16::MAX;
|
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}
|
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let idx = self.constants.len() as u16;
|
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self.constants.push(c);
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self.constant_map.insert(key, idx);
|
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return idx;
|
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}
|
||
|
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let idx = self.constants.len();
|
||
if idx >= u16::MAX as usize {
|
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self.const_overflow = true;
|
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return u16::MAX;
|
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}
|
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self.constants.push(c);
|
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idx as u16
|
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}
|
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|
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pub(crate) fn push_scope(&mut self) {
|
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self.scopes.symbols.push_scope();
|
||
}
|
||
|
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pub(crate) fn pop_scope(&mut self) {
|
||
self.scopes.symbols.pop_scope();
|
||
}
|
||
|
||
pub(crate) fn declare(
|
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&mut self, name: &str, reg: u32, kind: VariableDeclarationKind, is_const: bool,
|
||
) -> Result<(), String> {
|
||
self.scopes.symbols.declare(name, reg, kind, is_const)
|
||
}
|
||
|
||
pub(crate) fn declare_initialized(
|
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&mut self, name: &str, reg: u32, kind: VariableDeclarationKind, is_const: bool,
|
||
) -> Result<(), String> {
|
||
self.scopes.symbols.declare_initialized(name, reg, kind, is_const)
|
||
}
|
||
|
||
pub(crate) fn declare_predeclared(
|
||
&mut self, name: &str, reg: u32, kind: VariableDeclarationKind, is_const: bool,
|
||
) -> Result<(), String> {
|
||
self.scopes.symbols.declare_predeclared(name, reg, kind, is_const)
|
||
}
|
||
|
||
pub(crate) fn push_scope_with_kind(&mut self, kind: ScopeKind) {
|
||
self.scopes.symbols.push_scope_with_kind(kind);
|
||
}
|
||
|
||
pub(crate) fn lookup(&self, name: &str) -> Result<u32, String> {
|
||
self.scopes.symbols.lookup(name)
|
||
}
|
||
|
||
pub(crate) fn lookup_or_builtin(&mut self, name: &str) -> Result<u32, String> {
|
||
match self.scopes.symbols.lookup(name) {
|
||
Ok(reg) => Ok(reg),
|
||
// 未声明标识符按全局处理：`typeof X` 守卫等合法 JS 应在运行期判定
|
||
// 未定义（读取未定义全局返回 undefined），而非编译期报错。
|
||
Err(err) if err.contains("is not defined") => {
|
||
let reg = self.alloc_reg();
|
||
self.scopes.symbols.pre_register_global(name, reg);
|
||
self.scopes.builtin_reg_map.push((name.to_string(), reg));
|
||
Ok(reg)
|
||
}
|
||
Err(err) => Err(err),
|
||
}
|
||
}
|
||
|
||
pub(crate) fn lookup_or_global(&mut self, name: &str) -> u32 {
|
||
if let Some(reg) = self.scopes.symbols.lookup_any(name) {
|
||
return reg;
|
||
}
|
||
let reg = self.alloc_reg();
|
||
self.scopes.symbols.lookup_or_global(name, reg)
|
||
}
|
||
|
||
pub(crate) fn lookup_const_flag(&self, name: &str) -> bool {
|
||
self.scopes.symbols.lookup_is_const(name)
|
||
}
|
||
|
||
pub(crate) fn init_var(&mut self, name: &str) {
|
||
self.scopes.symbols.init_var(name);
|
||
}
|
||
|
||
pub(crate) fn next_label_id(&mut self) -> u32 {
|
||
let id = self.labels.label_counter;
|
||
self.labels.label_counter += 1;
|
||
id
|
||
}
|
||
|
||
pub(crate) fn push_loop(&mut self, break_label: LabelId, continue_label: LabelId) {
|
||
let fd = self.labels.finally_depth;
|
||
self.labels.loop_stack.push((break_label, continue_label, fd));
|
||
}
|
||
|
||
pub(crate) fn pop_loop(&mut self) {
|
||
self.labels.loop_stack.pop();
|
||
}
|
||
|
||
pub(crate) fn current_loop(&self) -> Option<&(LabelId, LabelId, usize)> {
|
||
self.labels.loop_stack.last()
|
||
}
|
||
|
||
pub(crate) fn push_switch(&mut self, break_label: LabelId) {
|
||
let fd = self.labels.finally_depth;
|
||
self.labels.switch_stack.push((break_label, fd));
|
||
}
|
||
|
||
pub(crate) fn pop_switch(&mut self) {
|
||
self.labels.switch_stack.pop();
|
||
}
|
||
|
||
pub(crate) fn current_switch(&self) -> Option<&(LabelId, usize)> {
|
||
self.labels.switch_stack.last()
|
||
}
|
||
|
||
/// 进入/离开一个 try/finally 域：break/continue 跨越 finally 计数用。
|
||
pub(crate) fn push_finally_domain(&mut self) {
|
||
self.labels.finally_depth += 1;
|
||
}
|
||
|
||
pub(crate) fn pop_finally_domain(&mut self) {
|
||
self.labels.finally_depth -= 1;
|
||
}
|
||
|
||
/// 记录一个纯 catch handler 打开（对应 emit try_begin 后的运行时 TRY_BEGIN）。
|
||
pub(crate) fn push_open_catch_handler(&mut self) {
|
||
self.open_try_handlers.push(true);
|
||
}
|
||
|
||
/// 记录一个 finally handler 打开（对应 emit try_finally_begin 后的运行时
|
||
/// TRY_FINALLY_BEGIN）。
|
||
pub(crate) fn push_open_finally_handler(&mut self) {
|
||
self.open_try_handlers.push(false);
|
||
}
|
||
|
||
/// 弹出最近打开的 handler（对应 emit 的 TRY_END / TRY_FINALLY_END）。
|
||
pub(crate) fn pop_open_try_handler(&mut self) {
|
||
self.open_try_handlers.pop();
|
||
}
|
||
|
||
/// 栈顶连续打开的纯 catch handler 数（遇 finally handler 即停）。
|
||
/// return 逃出本函数时，这些 handler 可由 TRY_END 直接从栈顶弹出；
|
||
/// finally 之下的 catch 无法经 TRY_END 弹出，交给运行时统一清理。
|
||
pub(crate) fn top_open_catch_handlers(&self) -> usize {
|
||
self.open_try_handlers.iter().rev().take_while(|&&is_catch| is_catch).count()
|
||
}
|
||
|
||
pub(crate) fn push_label_scope(
|
||
&mut self, name: &str, break_label: LabelId, continue_label: Option<LabelId>,
|
||
) -> Result<(), String> {
|
||
if self.labels.label_scopes.iter().any(|s| s.name == name) {
|
||
return Err(format!("SyntaxError: Label '{name}' has already been declared"));
|
||
}
|
||
let fd = self.labels.finally_depth;
|
||
self.labels.label_scopes.push(LabelScope {
|
||
name: name.to_string(),
|
||
break_label,
|
||
continue_label,
|
||
finally_depth_at_open: fd,
|
||
});
|
||
Ok(())
|
||
}
|
||
|
||
pub(crate) fn pop_label_scope(&mut self) {
|
||
self.labels.label_scopes.pop();
|
||
}
|
||
|
||
pub(crate) fn find_label(&self, name: &str) -> Option<&LabelScope> {
|
||
self.labels.label_scopes.iter().rev().find(|s| s.name == name)
|
||
}
|
||
|
||
/// 登记一个待绑定标签名：该标签将作为下一个 emit 的循环（标签语句体）的
|
||
/// continue 目标。活动集合与待绑定集合中出现重名报错。
|
||
pub(crate) fn queue_loop_label(&mut self, name: &str) -> Result<(), String> {
|
||
if self.labels.label_scopes.iter().any(|s| s.name == name)
|
||
|| self.labels.pending_loop_labels.iter().any(|n| n == name)
|
||
{
|
||
return Err(format!("SyntaxError: Label '{name}' has already been declared"));
|
||
}
|
||
self.labels.pending_loop_labels.push(name.to_string());
|
||
Ok(())
|
||
}
|
||
|
||
/// 把待绑定标签名落地为活动标签作用域，绑定到本次循环的 break/continue 目标。
|
||
/// 返回压入的作用域个数（供事后对称弹出）。
|
||
pub(crate) fn take_pending_loop_labels(&mut self, break_label: LabelId, continue_label: LabelId) -> usize {
|
||
let names = std::mem::take(&mut self.labels.pending_loop_labels);
|
||
let count = names.len();
|
||
let fd = self.labels.finally_depth;
|
||
for name in names {
|
||
self.labels.label_scopes.push(LabelScope {
|
||
name,
|
||
break_label,
|
||
continue_label: Some(continue_label),
|
||
finally_depth_at_open: fd,
|
||
});
|
||
}
|
||
count
|
||
}
|
||
|
||
pub(crate) fn pop_label_scopes(&mut self, n: usize) {
|
||
for _ in 0..n {
|
||
self.labels.label_scopes.pop();
|
||
}
|
||
}
|
||
|
||
pub(crate) fn is_builtin(&self, name: &str) -> bool {
|
||
self.scopes.builtin_reg_map.iter().any(|(n, _)| n == name)
|
||
}
|
||
|
||
/// 内置名是否被局部声明遮蔽（`var parseInt = ...` 等）。
|
||
/// builtin_reg_map 记录的是全局内置槽；若该名在静态作用域另有绑定，则调用应解析局部。
|
||
pub(crate) fn is_local_shadowing_builtin(&self, name: &str) -> bool {
|
||
if let Some(reg) = self.scopes.symbols.lookup_any(name) {
|
||
let is_builtin_slot = self.scopes.builtin_reg_map.iter().any(|(n, r)| n == name && *r == reg);
|
||
return !is_builtin_slot;
|
||
}
|
||
false
|
||
}
|
||
|
||
pub(crate) fn is_known_builtin(name: &str) -> bool {
|
||
BUILTIN_GLOBALS.contains(&name)
|
||
}
|
||
|
||
/// 进入 with 语句体：记录对象寄存器与当前作用域深度，供动态标识符解析。
|
||
pub(crate) fn push_with(&mut self, obj_reg: u32) {
|
||
let depth = self.scopes.symbols.scopes.len();
|
||
self.with_stack.push((obj_reg, depth));
|
||
}
|
||
|
||
/// 离开 with 语句体。
|
||
pub(crate) fn pop_with(&mut self) {
|
||
self.with_stack.pop();
|
||
}
|
||
|
||
/// 最内层 with 对象寄存器；无 with 时为 None。
|
||
pub(crate) fn innermost_with_obj(&self) -> Option<u32> {
|
||
self.with_stack.last().map(|&(reg, _)| reg)
|
||
}
|
||
|
||
/// 指定名字是否在 with 语句体**内**（with 打开之后的块作用域）声明。
|
||
/// with 内声明优先于对象属性；with 之前的外层声明被对象遮蔽。
|
||
pub(crate) fn is_with_internal_binding(&self, name: &str) -> bool {
|
||
let Some(&(_, depth)) = self.with_stack.last() else {
|
||
return false;
|
||
};
|
||
matches!(self.scopes.symbols.lookup_any_binding(name), Some((_, idx)) if idx >= depth)
|
||
}
|
||
|
||
fn builtin_reg_floor(&self) -> u32 {
|
||
self.scopes
|
||
.builtin_reg_map
|
||
.iter()
|
||
.map(|(_, reg)| reg.saturating_add(1))
|
||
.max()
|
||
.unwrap_or(0)
|
||
}
|
||
|
||
/// 组装 IRFunction（两出口共用），take 走编译产物状态。
|
||
/// `parent_ctx` 用于补全 upvalue_captures 的 enclosing_reg（父符号表在父 emit 完成后完整）。
|
||
fn assemble_ir(&mut self, param_layout: oxide_ir::ParamLayout, parent_ctx: Option<&CompileCtx>) -> IRFunction {
|
||
let upvalue_captures = self
|
||
.current_upvalue_captures
|
||
.iter()
|
||
.map(|u| {
|
||
let enclosing_reg = parent_ctx
|
||
.and_then(|p| p.scopes.symbols.lookup_any(u.name.as_str()))
|
||
.unwrap_or(0);
|
||
UpvalueCapture {
|
||
name: u.name.clone(),
|
||
enclosing_reg,
|
||
cell_idx: u.cell_idx,
|
||
parent_uv_idx: u.parent_uv_idx,
|
||
}
|
||
})
|
||
.collect();
|
||
IRFunction {
|
||
insts: std::mem::take(&mut self.insts),
|
||
label_pos: std::mem::take(&mut self.labels.label_pos),
|
||
label_count: self.labels.label_counter,
|
||
constants: std::mem::take(&mut self.constants),
|
||
param_layout,
|
||
builtin_reg_map: std::mem::take(&mut self.scopes.builtin_reg_map),
|
||
upvalue_captures,
|
||
cells_needed: self.captured_bindings.len() as u8,
|
||
n_registers: self.max_regs,
|
||
is_arrow: false,
|
||
is_class_constructor: false,
|
||
is_derived_constructor: false,
|
||
needs_home_object: false,
|
||
is_generator: self.is_generator,
|
||
is_async: self.is_async,
|
||
captured_this_const_idx: 0,
|
||
function_name: None,
|
||
function_length: self.function_length,
|
||
is_top_level: parent_ctx.is_none(),
|
||
const_overflow: self.const_overflow,
|
||
nested: std::mem::take(&mut self.nested),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl ConstantKey {
|
||
fn from_constant(value: &Constant) -> Option<Self> {
|
||
match value {
|
||
Constant::Number(v) => Some(Self::Number(v.to_bits())),
|
||
Constant::Int(v) => Some(Self::Int(*v)),
|
||
Constant::BigInt(v) => Some(Self::BigInt(*v)),
|
||
Constant::String(v) => Some(Self::String(v.clone())),
|
||
Constant::Boolean(v) => Some(Self::Boolean(*v)),
|
||
Constant::Null => Some(Self::Null),
|
||
Constant::Undefined => Some(Self::Undefined),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Emitter {
|
||
/// 构造空 `Emitter`（无内部状态，所有状态在 `CompileCtx` 中）。
|
||
pub fn new() -> Self {
|
||
Self
|
||
}
|
||
|
||
/// 生成运行时抛 ReferenceError 的指令序列，返回一个未定义 dummy 寄存器
|
||
/// 保证 THROW 后不可达控制流的寄存器良定义。
|
||
///
|
||
/// # 步骤
|
||
/// 1. 取全局 ReferenceError 构造器并 LOAD。
|
||
/// 2. 加载错误消息常量，`new ReferenceError(msg)` 构造错误对象。
|
||
/// 3. THROW 抛出；尾接 dummy 值保持后续读引用有确定寄存器。
|
||
pub(crate) fn emit_tdz_throw(&self, msg: &str, ctx: &mut CompileCtx) -> Result<u32, String> {
|
||
let ctor_reg = ctx.lookup_or_builtin("ReferenceError")?;
|
||
let ctor = ctx.alloc_reg();
|
||
ctx.inst(Inst::new(OpCode::LOAD_VAR, Operand::Reg(ctor), Operand::Reg(ctor_reg), Operand::None));
|
||
let msg_reg = ctx.alloc_reg();
|
||
let msg_idx = ctx.add_constant(Constant::String(msg.to_string()));
|
||
ctx.inst(Inst::load_const(Operand::Reg(msg_reg), msg_idx));
|
||
let exc_reg = ctx.alloc_reg();
|
||
ctx.inst(Inst::new_expression(
|
||
Operand::Reg(exc_reg),
|
||
Operand::Reg(ctor),
|
||
Operand::Reg(msg_reg),
|
||
1,
|
||
));
|
||
ctx.inst(Inst::new(OpCode::THROW, Operand::Reg(exc_reg), Operand::None, Operand::None));
|
||
let dummy = ctx.alloc_reg();
|
||
let undef_idx = ctx.add_constant(Constant::Undefined);
|
||
ctx.inst(Inst::load_const(Operand::Reg(dummy), undef_idx));
|
||
Ok(dummy)
|
||
}
|
||
|
||
/// 遍历解构 pattern 收集内嵌默认值表达式（AssignmentPattern.right）。
|
||
fn collect_pattern_default_exprs<'a>(
|
||
&self, pattern: &'a oxide_parser::BindingPattern<'a>, out: &mut Vec<&'a oxide_parser::Expression<'a>>,
|
||
) {
|
||
use oxide_parser::BindingPattern;
|
||
match pattern {
|
||
BindingPattern::AssignmentPattern(ap) => {
|
||
out.push(&ap.right);
|
||
self.collect_pattern_default_exprs(&ap.left, out);
|
||
}
|
||
BindingPattern::ArrayPattern(ap) => {
|
||
for elem in &ap.elements {
|
||
if let Some(p) = elem {
|
||
self.collect_pattern_default_exprs(p, out);
|
||
}
|
||
}
|
||
if let Some(rest) = &ap.rest {
|
||
self.collect_pattern_default_exprs(&rest.argument, out);
|
||
}
|
||
}
|
||
BindingPattern::ObjectPattern(op) => {
|
||
for prop in &op.properties {
|
||
self.collect_pattern_default_exprs(&prop.value, out);
|
||
}
|
||
if let Some(rest) = &op.rest {
|
||
self.collect_pattern_default_exprs(&rest.argument, out);
|
||
}
|
||
}
|
||
_ => {}
|
||
}
|
||
}
|
||
|
||
// ── 闭包捕获分析（AST 级，时序无关）──
|
||
|
||
/// 把 rest 形参的绑定模式追加为 `ParamSpec::Rest`：仅支持标识符形态（解构 rest 未支持）。
|
||
pub(crate) fn push_rest_param<'a>(
|
||
&self, argument: &'a oxide_parser::BindingPattern<'a>, out: &mut Vec<ParamSpec<'a>>,
|
||
) -> Result<(), String> {
|
||
match argument {
|
||
oxide_parser::BindingPattern::BindingIdentifier(bi) => {
|
||
out.push(ParamSpec::Rest { name: bi.name.to_string() });
|
||
}
|
||
_ => return Err("rest parameters with destructuring patterns not yet supported".into()),
|
||
}
|
||
Ok(())
|
||
}
|
||
|
||
/// 收集函数参数的绑定名（BindingIdentifier 形态）。
|
||
pub(crate) fn extract_function_parts<'a>(
|
||
&self, function: &'a oxide_parser::Function<'a>,
|
||
) -> Result<(Vec<ParamSpec<'a>>, &'a [Statement<'a>]), String> {
|
||
let mut param_specs = Vec::new();
|
||
for (idx, param) in function.params.items.iter().enumerate() {
|
||
match ¶m.pattern {
|
||
oxide_parser::BindingPattern::BindingIdentifier(bi) => {
|
||
param_specs.push(ParamSpec::Identifier {
|
||
name: bi.name.to_string(),
|
||
initializer: param.initializer.as_deref(),
|
||
});
|
||
}
|
||
pattern => {
|
||
param_specs.push(ParamSpec::Pattern {
|
||
synthetic_name: format!("@@param_{idx}"),
|
||
pattern,
|
||
initializer: param.initializer.as_deref(),
|
||
});
|
||
}
|
||
}
|
||
}
|
||
if let Some(rest) = &function.params.rest {
|
||
self.push_rest_param(&rest.rest.argument, &mut param_specs)?;
|
||
}
|
||
let body_stmts: &[Statement] = if let Some(body) = &function.body { &body.statements } else { &[] };
|
||
Ok((param_specs, body_stmts))
|
||
}
|
||
|
||
/// 编译函数体（函数声明/函数表达式/箭头函数共用），单 pass 完成发码。
|
||
///
|
||
/// `is_expression_body` 为 true（箭头表达式体）时返回最后一个表达式的值，
|
||
/// 否则返回 undefined。`is_arrow` 控制 super 相关标志的继承：箭头函数词法
|
||
/// 继承外层 super，普通函数重置 super 作用域。
|
||
pub(crate) fn compile_function_body<'a>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
is_expression_body: bool, is_arrow: bool,
|
||
) -> Result<IRFunction, String> {
|
||
self.compile_function_body_with_flags(
|
||
param_specs,
|
||
body_stmts,
|
||
parent_ctx,
|
||
is_expression_body,
|
||
is_arrow,
|
||
false,
|
||
false,
|
||
)
|
||
}
|
||
|
||
/// 编译函数体并显式指定生成器标志（`function*` 走此入口）。
|
||
pub(crate) fn compile_generator_body<'a>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
) -> Result<IRFunction, String> {
|
||
self.compile_function_body_with_flags(param_specs, body_stmts, parent_ctx, false, false, true, false)
|
||
}
|
||
|
||
/// 编译异步生成器函数体（`async function*` / async 生成器表达式走此入口）：
|
||
/// 同时标记 `is_generator` 与 `is_async`，VM 调用时按异步生成器协议执行
|
||
/// （next 返回 Promise，yield 挂起与 await 挂起共存）。
|
||
pub(crate) fn compile_async_generator_body<'a>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
) -> Result<IRFunction, String> {
|
||
self.compile_function_body_with_flags(param_specs, body_stmts, parent_ctx, false, false, true, true)
|
||
}
|
||
|
||
/// 编译异步函数体（`async function` / async 箭头走此入口）：`is_async` 使
|
||
/// `assemble_ir` 标记模块，VM 调用时按异步函数协议执行。
|
||
pub(crate) fn compile_async_body<'a>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
is_expression_body: bool, is_arrow: bool,
|
||
) -> Result<IRFunction, String> {
|
||
self.compile_function_body_with_flags(
|
||
param_specs,
|
||
body_stmts,
|
||
parent_ctx,
|
||
is_expression_body,
|
||
is_arrow,
|
||
false,
|
||
true,
|
||
)
|
||
}
|
||
|
||
fn compile_function_body_with_flags<'a>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
is_expression_body: bool, is_arrow: bool, is_generator: bool, is_async: bool,
|
||
) -> Result<IRFunction, String> {
|
||
let body_context = if is_arrow {
|
||
FunctionBodyContext::Arrow
|
||
} else {
|
||
FunctionBodyContext::Ordinary
|
||
};
|
||
self.compile_function_body_with_bindings_gen(
|
||
param_specs,
|
||
body_stmts,
|
||
parent_ctx,
|
||
is_expression_body,
|
||
&[],
|
||
body_context,
|
||
is_generator,
|
||
is_async,
|
||
)
|
||
}
|
||
|
||
#[allow(clippy::too_many_arguments)]
|
||
pub(crate) fn compile_function_body_with_bindings_gen<'a>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
is_expression_body: bool, extra_bindings: &[(&str, u32)], body_context: FunctionBodyContext,
|
||
is_generator: bool, is_async: bool,
|
||
) -> Result<IRFunction, String> {
|
||
self.compile_function_body_with_field_hooks_gen(
|
||
param_specs,
|
||
body_stmts,
|
||
parent_ctx,
|
||
is_expression_body,
|
||
extra_bindings,
|
||
body_context,
|
||
None::<fn(&Emitter, &mut CompileCtx) -> Result<(), String>>,
|
||
false,
|
||
&[],
|
||
&[],
|
||
is_generator,
|
||
is_async,
|
||
)
|
||
}
|
||
|
||
/// 预注册 builtin 引用并编译函数体（普通/箭头/类元素方法共用入口）。
|
||
///
|
||
/// 本函数体内任意位置（表达式、成员对象、调用实参、类字段等）引用的内置全局
|
||
/// 标识符，其寄存器槽都先于任何临时寄存器登记。
|
||
///
|
||
/// vreg 化后临时值不复用（独立 vreg），但 builtin 槽预注册仍保证分配序稳定：
|
||
/// builtin 槽先于临时值池，嵌套函数继承边界不受扰。
|
||
#[allow(clippy::too_many_arguments)]
|
||
pub(crate) fn compile_function_body_with_field_hooks<'a, E>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
is_expression_body: bool, extra_bindings: &[(&str, u32)], body_context: FunctionBodyContext,
|
||
emit_fields: Option<E>, fields_after_super: bool, extra_capture_exprs: &[&'a Expression<'a>],
|
||
extra_upvalue_names: &[(&str, u8)],
|
||
) -> Result<IRFunction, String>
|
||
where
|
||
E: FnMut(&Emitter, &mut CompileCtx) -> Result<(), String>,
|
||
{
|
||
self.compile_function_body_with_field_hooks_gen(
|
||
param_specs,
|
||
body_stmts,
|
||
parent_ctx,
|
||
is_expression_body,
|
||
extra_bindings,
|
||
body_context,
|
||
emit_fields,
|
||
fields_after_super,
|
||
extra_capture_exprs,
|
||
extra_upvalue_names,
|
||
false,
|
||
false,
|
||
)
|
||
}
|
||
|
||
#[allow(clippy::too_many_arguments)]
|
||
pub(crate) fn compile_function_body_with_field_hooks_gen<'a, E>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
is_expression_body: bool, extra_bindings: &[(&str, u32)], body_context: FunctionBodyContext,
|
||
mut emit_fields: Option<E>, fields_after_super: bool, extra_capture_exprs: &[&'a Expression<'a>],
|
||
extra_upvalue_names: &[(&str, u8)], is_generator: bool, is_async: bool,
|
||
) -> Result<IRFunction, String>
|
||
where
|
||
E: FnMut(&Emitter, &mut CompileCtx) -> Result<(), String>,
|
||
{
|
||
let mut ctx = CompileCtx::new();
|
||
ctx.is_generator = is_generator;
|
||
ctx.is_async = is_async;
|
||
|
||
// length = 第一个带默认值形参之前的形参数（解构默认与标识符默认同规则）；
|
||
// rest 参数不计入 length（以 0 结尾即止）。
|
||
ctx.function_length = param_specs
|
||
.iter()
|
||
.take_while(|spec| match spec {
|
||
ParamSpec::Identifier { initializer, .. } => initializer.is_none(),
|
||
ParamSpec::Pattern { initializer, .. } => initializer.is_none(),
|
||
ParamSpec::Rest { .. } => false,
|
||
})
|
||
.count() as u32;
|
||
|
||
// 继承父内置寄存器映射：子模块寄存器文件中，内置标识符（Math、Object 等）
|
||
// 解析到父预先分配的槽位。
|
||
ctx.scopes.builtin_reg_map = parent_ctx.scopes.builtin_reg_map.clone();
|
||
ctx.scopes.private_name_map = parent_ctx.scopes.private_name_map.clone();
|
||
ctx.scopes.private_element_kinds = parent_ctx.scopes.private_element_kinds.clone();
|
||
ctx.scopes.private_brand_id = parent_ctx.scopes.private_brand_id;
|
||
ctx.scopes.next_private_name_id = parent_ctx.scopes.next_private_name_id;
|
||
|
||
// 传递 enclosing_this_reg：嵌套箭头函数捕获正确的 `this`。
|
||
ctx.enclosing_this_reg = parent_ctx.enclosing_this_reg;
|
||
|
||
// 箭头函数词法继承 super；类方法体顶层编译也需要类提供的 super 上下文。
|
||
if matches!(body_context, FunctionBodyContext::Arrow | FunctionBodyContext::ClassElement) {
|
||
ctx.in_derived_constructor = parent_ctx.in_derived_constructor;
|
||
ctx.in_instance_method = parent_ctx.in_instance_method;
|
||
ctx.in_static_method = parent_ctx.in_static_method;
|
||
} else {
|
||
ctx.in_derived_constructor = false;
|
||
ctx.in_instance_method = false;
|
||
ctx.in_static_method = false;
|
||
}
|
||
|
||
// 继承父全局作用域条目：先前声明的函数名在函数体内可见。
|
||
let mut inherited_reg_start = 1u32.max(ctx.builtin_reg_floor());
|
||
for (name, binding) in &parent_ctx.scopes.symbols.scopes[0].bindings {
|
||
ctx.scopes.symbols.scopes[0].bindings.insert(
|
||
name.clone(),
|
||
Binding {
|
||
reg: binding.reg,
|
||
initialized: binding.initialized,
|
||
is_const: binding.is_const,
|
||
predeclared: false,
|
||
},
|
||
);
|
||
inherited_reg_start = inherited_reg_start.max(binding.reg.saturating_add(1));
|
||
}
|
||
for (name, reg) in extra_bindings {
|
||
ctx.scopes.symbols.scopes[0].bindings.insert(
|
||
(*name).to_string(),
|
||
Binding {
|
||
reg: *reg,
|
||
initialized: true,
|
||
is_const: true,
|
||
predeclared: false,
|
||
},
|
||
);
|
||
inherited_reg_start = inherited_reg_start.max(reg.saturating_add(1));
|
||
}
|
||
ctx.reserved_reg_start = inherited_reg_start.max(1);
|
||
|
||
// 让 next_reg 与 builtin 槽位对齐，参数在 builtin 槽之后分配。
|
||
ctx.reset_regs();
|
||
|
||
let param_base = self.emit_params_prologue(
|
||
param_specs,
|
||
body_stmts,
|
||
parent_ctx,
|
||
&mut ctx,
|
||
body_context,
|
||
extra_capture_exprs,
|
||
extra_upvalue_names,
|
||
)?;
|
||
// 实例字段 computed key 数组所在 upvalue 下标，供字段初始化 emit 定位。
|
||
ctx.field_keys_uv = ctx
|
||
.current_upvalue_captures
|
||
.iter()
|
||
.position(|u| u.name == "@@field_keys")
|
||
.map(|i| i as u8);
|
||
|
||
self.predeclare_function_declarations(body_stmts, &mut ctx);
|
||
|
||
// 预注册 builtin 引用（先于任何临时寄存器），builtin 槽不与被复用的临时值冲突。
|
||
self.pre_register_builtin_references(body_stmts, &mut ctx);
|
||
|
||
// 预声明 `var` 名，使首个 sub-pass 中提升的函数声明能解析其闭包引用的外层 var。
|
||
self.predeclare_var_declarations(body_stmts, &mut ctx);
|
||
|
||
// 预声明 body 级 `let`/`const`/`class`（未初始化 TDZ 占位），
|
||
// 使声明点前读取可编译为运行时 ReferenceError。
|
||
self.predeclare_lexical_declarations(body_stmts, &mut ctx);
|
||
|
||
// 生成器：body 起点标记——调用时参数初始化（emit_params_prologue）结束后挂起于此，
|
||
// 参数副作用/异常在 `g()` 调用时刻生效，首次 next() 从这继续执行 body。
|
||
if is_generator {
|
||
ctx.inst(Inst::suspend_body());
|
||
}
|
||
|
||
if let Some(emit) = emit_fields.as_mut() {
|
||
if fields_after_super {
|
||
let mut parent_insts = Vec::new();
|
||
let mut parent_label_pos = Vec::new();
|
||
std::mem::swap(&mut ctx.insts, &mut parent_insts);
|
||
std::mem::swap(&mut ctx.labels.label_pos, &mut parent_label_pos);
|
||
emit(self, &mut ctx)?;
|
||
let field_buffer = FieldBuffer {
|
||
insts: std::mem::take(&mut ctx.insts),
|
||
labels: std::mem::take(&mut ctx.labels.label_pos)
|
||
.into_iter()
|
||
.enumerate()
|
||
.filter_map(|(id, pos)| pos.map(|p| (id as LabelId, p)))
|
||
.collect(),
|
||
};
|
||
ctx.insts = parent_insts;
|
||
ctx.labels.label_pos = parent_label_pos;
|
||
ctx.field_buffer = Some(field_buffer);
|
||
} else {
|
||
emit(self, &mut ctx)?;
|
||
}
|
||
}
|
||
|
||
// 发 body 语句（先函数声明 hoisting，再其余）。
|
||
let last_result_reg = self.emit_body_stmts(body_stmts, &mut ctx)?;
|
||
|
||
// 隐式 RETURN：表达式体返回最后表达式，语句体返回 undefined。
|
||
if is_expression_body {
|
||
if let Some(reg) = last_result_reg {
|
||
ctx.inst(Inst::new(OpCode::RETURN, Operand::Reg(reg), Operand::None, Operand::None));
|
||
} else {
|
||
let undef_idx = ctx.add_constant(Constant::Undefined);
|
||
let undef_reg = ctx.alloc_reg();
|
||
ctx.inst(Inst::load_const(Operand::Reg(undef_reg), undef_idx));
|
||
ctx.inst(Inst::new(OpCode::RETURN, Operand::Reg(undef_reg), Operand::None, Operand::None));
|
||
}
|
||
} else {
|
||
let undef_idx = ctx.add_constant(Constant::Undefined);
|
||
let undef_reg = ctx.alloc_reg();
|
||
ctx.inst(Inst::load_const(Operand::Reg(undef_reg), undef_idx));
|
||
ctx.inst(Inst::new(OpCode::RETURN, Operand::Reg(undef_reg), Operand::None, Operand::None));
|
||
}
|
||
|
||
// 调用契约参数段只含固定形参：rest 是函数体内普通变量，不在 VM 实参传递区。
|
||
let fixed_count = param_specs
|
||
.iter()
|
||
.filter(|spec| !matches!(spec, ParamSpec::Rest { .. }))
|
||
.count() as u32;
|
||
let ir = ctx.assemble_ir(
|
||
oxide_ir::ParamLayout {
|
||
base: param_base,
|
||
count: fixed_count,
|
||
},
|
||
Some(parent_ctx),
|
||
);
|
||
Ok(ir)
|
||
}
|
||
|
||
/// 参数 prologue：函数作用域 + 参数声明/解构 + 闭包捕获与 upvalue 分析。返回 param_base。
|
||
fn emit_params_prologue<'a>(
|
||
&self, param_specs: &[ParamSpec<'a>], body_stmts: &[Statement<'a>], parent_ctx: &CompileCtx,
|
||
ctx: &mut CompileCtx, body_context: FunctionBodyContext, extra_capture_exprs: &[&'a Expression<'a>],
|
||
extra_upvalue_names: &[(&str, u8)],
|
||
) -> Result<u32, String> {
|
||
ctx.push_scope_with_kind(ScopeKind::FunctionScope);
|
||
let param_base = ctx.next_reg;
|
||
|
||
// 发参数声明（分配寄存器；分析用 register_name 引用）。
|
||
for spec in param_specs {
|
||
let name = spec.register_name();
|
||
let reg = ctx.alloc_reg();
|
||
ctx.declare_initialized(name, reg, VariableDeclarationKind::Var, false)?;
|
||
}
|
||
|
||
// 闭包捕获分析（AST 级，emit 前确定）：须在参数默认值 emit 之前，
|
||
// 否则默认值内嵌套函数（IIFE）编译时父分析为空 → upvalue 捕获丢失。
|
||
let param_names: Vec<&str> = param_specs.iter().map(|s| s.register_name()).collect();
|
||
let mut param_defaults: Vec<&oxide_parser::Expression> = Vec::new();
|
||
for spec in param_specs {
|
||
match spec {
|
||
ParamSpec::Identifier { initializer, .. } => {
|
||
if let Some(init) = initializer {
|
||
param_defaults.push(init);
|
||
}
|
||
}
|
||
ParamSpec::Pattern { pattern, initializer, .. } => {
|
||
if let Some(init) = initializer {
|
||
param_defaults.push(init);
|
||
}
|
||
// 模式内嵌默认值（`[x = expr]` 的 AssignmentPattern.right）也会被
|
||
// 内部闭包引用，需纳入捕获分析。
|
||
self.collect_pattern_default_exprs(pattern, &mut param_defaults);
|
||
}
|
||
ParamSpec::Rest { .. } => {}
|
||
}
|
||
}
|
||
ctx.own_bindings = self.collect_own_binding_names(¶m_names, body_stmts);
|
||
|
||
// 自动声明 arguments 绑定（非箭头函数，且用户未显式声明同名标识符）。
|
||
// 先登记符号并纳入 own_bindings，使嵌套箭头引用 arguments 被识别为本函数
|
||
// 绑定（否则被当自由变量 → 子模块 upvalue 解析错位）。
|
||
let mut arguments_reg = None;
|
||
if !matches!(body_context, FunctionBodyContext::Arrow) && !ctx.own_bindings.contains("arguments") {
|
||
let reg = ctx.alloc_reg();
|
||
ctx.declare_initialized("arguments", reg, VariableDeclarationKind::Var, false)?;
|
||
ctx.own_bindings.insert("arguments".to_string());
|
||
arguments_reg = Some(reg);
|
||
}
|
||
|
||
// 字段初始化表达式（值表达式）与参数默认值一并纳入捕获分析。
|
||
let mut capture_exprs: Vec<&oxide_parser::Expression> = param_defaults.clone();
|
||
capture_exprs.extend_from_slice(extra_capture_exprs);
|
||
ctx.captured_bindings = self.collect_captured_bindings(body_stmts, &capture_exprs, &ctx.own_bindings);
|
||
// 自由变量分析：收集 upvalue 捕获（类方法也是普通函数，可捕获外层变量）。
|
||
if matches!(
|
||
body_context,
|
||
FunctionBodyContext::Ordinary | FunctionBodyContext::Arrow | FunctionBodyContext::ClassElement
|
||
) {
|
||
ctx.current_upvalue_captures = self.collect_upvalue_names(
|
||
body_stmts,
|
||
&capture_exprs,
|
||
&parent_ctx.captured_bindings,
|
||
&parent_ctx.current_upvalue_captures,
|
||
&ctx.own_bindings,
|
||
);
|
||
// 类字段 computed key 数组等合成捕获：直接追加 upvalue（cell_idx 由父分配）。
|
||
for (name, cell_idx) in extra_upvalue_names {
|
||
if !ctx.current_upvalue_captures.iter().any(|u| u.name == *name) {
|
||
ctx.current_upvalue_captures.push(UpvalueCapture {
|
||
name: (*name).to_string(),
|
||
enclosing_reg: 0,
|
||
cell_idx: *cell_idx,
|
||
parent_uv_idx: None,
|
||
});
|
||
}
|
||
}
|
||
}
|
||
|
||
// 创建 arguments 对象：指令须在默认参数求值前发出（默认参数可引用 arguments）。
|
||
if let Some(reg) = arguments_reg {
|
||
ctx.inst(Inst::create_arguments(Operand::Reg(reg)));
|
||
}
|
||
|
||
for spec in param_specs {
|
||
match spec {
|
||
ParamSpec::Pattern {
|
||
synthetic_name,
|
||
pattern,
|
||
initializer,
|
||
} => {
|
||
let src_reg = ctx.lookup(synthetic_name)?;
|
||
let src_reg = if let Some(init) = initializer {
|
||
self.emit_default_if_undefined(src_reg, init, Some(synthetic_name), ctx)?
|
||
} else {
|
||
src_reg
|
||
};
|
||
self.emit_binding_pattern(pattern, src_reg, VariableDeclarationKind::Var, false, false, ctx)?;
|
||
}
|
||
ParamSpec::Identifier { name, initializer } => {
|
||
if let Some(init) = initializer {
|
||
// 默认参数：实参为 undefined 时用默认值。
|
||
let reg = ctx.lookup(name)?;
|
||
self.emit_default_if_undefined(reg, init, Some(name), ctx)?;
|
||
}
|
||
}
|
||
ParamSpec::Rest { name } => {
|
||
// rest 数组：从实参区收集固定形参之后的实参，绑定为普通变量。
|
||
let reg = ctx.lookup(name)?;
|
||
let fixed_count =
|
||
param_specs.iter().filter(|s| !matches!(s, ParamSpec::Rest { .. })).count() as u32;
|
||
ctx.inst(Inst::create_rest_array(Operand::Reg(reg), fixed_count));
|
||
}
|
||
}
|
||
}
|
||
|
||
// 被捕获的参数也必须建 cell（MAKE_CELL）：否则子函数经 lazy upvalue 路径读
|
||
// 自身寄存器（依赖调用者寄存器残留），vreg 化/RegAlloc 移动寄存器后读到垃圾。
|
||
// 与 var/let/const 的 MAKE_CELL 语义一致（binding.rs:50）。须在默认值之后
|
||
// （默认值 emit 会读参数寄存器）。
|
||
for spec in param_specs {
|
||
let name = spec.register_name();
|
||
if let Some(&cell_idx) = ctx.captured_bindings.get(name) {
|
||
let reg = ctx.lookup(name)?;
|
||
ctx.inst(Inst::new(
|
||
OpCode::MAKE_CELL,
|
||
Operand::Reg(reg),
|
||
Operand::Imm(cell_idx as u16),
|
||
Operand::None,
|
||
));
|
||
}
|
||
}
|
||
|
||
// 被捕获的 arguments 绑定同样建 cell（与参数一致，须在默认值之后）。
|
||
if let (Some(reg), Some(&cell_idx)) = (arguments_reg, ctx.captured_bindings.get("arguments")) {
|
||
ctx.inst(Inst::new(
|
||
OpCode::MAKE_CELL,
|
||
Operand::Reg(reg),
|
||
Operand::Imm(cell_idx as u16),
|
||
Operand::None,
|
||
));
|
||
}
|
||
|
||
Ok(param_base)
|
||
}
|
||
|
||
/// 双 sub-pass emit body：先函数声明（hoisting），再其余语句。返回最后结果寄存器。
|
||
fn emit_body_stmts(&self, body_stmts: &[Statement], ctx: &mut CompileCtx) -> Result<Option<u32>, String> {
|
||
let mut last_result_reg = None;
|
||
for stmt in body_stmts {
|
||
if matches!(stmt, Statement::FunctionDeclaration(_)) {
|
||
if let Some(reg) = self.emit_statement(stmt, ctx)? {
|
||
last_result_reg = Some(reg);
|
||
}
|
||
}
|
||
}
|
||
for stmt in body_stmts {
|
||
if matches!(stmt, Statement::FunctionDeclaration(_)) {
|
||
continue;
|
||
}
|
||
if let Some(reg) = self.emit_statement(stmt, ctx)? {
|
||
last_result_reg = Some(reg);
|
||
}
|
||
}
|
||
Ok(last_result_reg)
|
||
}
|
||
|
||
pub(crate) fn emit_statement(&self, stmt: &Statement, ctx: &mut CompileCtx) -> Result<Option<u32>, String> {
|
||
match stmt {
|
||
Statement::ExpressionStatement(_) | Statement::ReturnStatement(_) | Statement::EmptyStatement(_) => {
|
||
self.emit_basic_domain(stmt, ctx)
|
||
}
|
||
Statement::BlockStatement(_) => self.emit_block_domain(stmt, ctx),
|
||
Statement::VariableDeclaration(_) | Statement::FunctionDeclaration(_) | Statement::ClassDeclaration(_) => {
|
||
self.emit_declaration_domain(stmt, ctx)
|
||
}
|
||
Statement::IfStatement(_) => self.emit_control_domain(stmt, ctx),
|
||
Statement::WhileStatement(_)
|
||
| Statement::DoWhileStatement(_)
|
||
| Statement::ForStatement(_)
|
||
| Statement::ForInStatement(_)
|
||
| Statement::ForOfStatement(_) => self.emit_iteration_domain(stmt, ctx),
|
||
Statement::SwitchStatement(_) => self.emit_switch_domain(stmt, ctx),
|
||
Statement::ThrowStatement(_) | Statement::TryStatement(_) => self.emit_exception_domain(stmt, ctx),
|
||
Statement::BreakStatement(b) => self.emit_break_statement(b, ctx),
|
||
Statement::ContinueStatement(c) => self.emit_continue_statement(c, ctx),
|
||
Statement::LabeledStatement(ls) => self.emit_labeled_statement(ls, ctx),
|
||
Statement::WithStatement(_) => self.emit_with_domain(stmt, ctx),
|
||
_ => Ok(None),
|
||
}
|
||
}
|
||
|
||
pub(crate) fn emit_expression(&self, expr: &Expression, ctx: &mut CompileCtx) -> Result<u32, String> {
|
||
match expr {
|
||
Expression::NumericLiteral(_)
|
||
| Expression::BigIntLiteral(_)
|
||
| Expression::StringLiteral(_)
|
||
| Expression::BooleanLiteral(_)
|
||
| Expression::NullLiteral(_)
|
||
| Expression::RegExpLiteral(_) => self.emit_literal(expr, ctx),
|
||
Expression::BinaryExpression(_)
|
||
| Expression::PrivateInExpression(_)
|
||
| Expression::UnaryExpression(_)
|
||
| Expression::ConditionalExpression(_)
|
||
| Expression::LogicalExpression(_)
|
||
| Expression::UpdateExpression(_) => self.emit_operator(expr, ctx),
|
||
Expression::StaticMemberExpression(_)
|
||
| Expression::ComputedMemberExpression(_)
|
||
| Expression::PrivateFieldExpression(_)
|
||
| Expression::ChainExpression(_) => self.emit_member_domain(expr, ctx),
|
||
Expression::ObjectExpression(_) | Expression::ArrayExpression(_) => self.emit_object_domain(expr, ctx),
|
||
Expression::AssignmentExpression(assign) => self.emit_assignment_expression(assign, ctx),
|
||
Expression::TemplateLiteral(_) | Expression::TaggedTemplateExpression(_) => {
|
||
self.emit_template_domain(expr, ctx)
|
||
}
|
||
Expression::ArrowFunctionExpression(_)
|
||
| Expression::FunctionExpression(_)
|
||
| Expression::ClassExpression(_)
|
||
| Expression::NewExpression(_) => self.emit_function_domain(expr, ctx),
|
||
Expression::Identifier(ident) => self.emit_identifier_expression(ident, ctx),
|
||
Expression::YieldExpression(ye) => self.emit_yield_expression(ye, ctx),
|
||
Expression::AwaitExpression(ae) => self.emit_await_expression(ae, ctx),
|
||
Expression::CallExpression(_) => self.emit_call_domain(expr, ctx),
|
||
Expression::ThisExpression(_) => self.emit_this_expression(ctx),
|
||
Expression::SequenceExpression(seq) => self.emit_sequence_expression(seq, ctx),
|
||
Expression::ParenthesizedExpression(p) => self.emit_parenthesized_expression(p, ctx),
|
||
_ => self.emit_unsupported_expression(expr, ctx),
|
||
}
|
||
}
|
||
|
||
/// 把脚本顶层 var/function 绑定的当前值同步写入全局对象属性，使顶层声明
|
||
/// 可经 `globalThis` 反射（脚本环境记录的 var 绑定全局对象属性）。
|
||
///
|
||
/// # 边界与前提
|
||
/// - 仅顶层模块上下文调用：顶层 `this`（物理寄存器 254）恒为全局对象。
|
||
/// - let/const/class 不落全局对象，不得调用本函数。
|
||
///
|
||
/// # 副作用
|
||
/// - 定义全局对象数据属性（可写/可枚举/不可配置），属性缺失时新建。
|
||
pub(crate) fn emit_global_prop_write(&self, name: &str, val_reg: u32, ctx: &mut CompileCtx) {
|
||
let idx = ctx.add_constant(Constant::String(name.to_string()));
|
||
let key_reg = ctx.alloc_reg();
|
||
ctx.inst(Inst::load_const(Operand::Reg(key_reg), idx));
|
||
ctx.inst(Inst::define_global_prop(Operand::This, Operand::Reg(val_reg), Operand::Reg(key_reg)));
|
||
}
|
||
|
||
/// 把完整程序编译为顶层模块体的 IRFunction。
|
||
///
|
||
/// 调用方为 `oxide_compiler::Compiler::compile`：本函数完成 emit 半程，
|
||
/// 随后由 `oxide_ir::lower::lower` 降为字节码。
|
||
pub fn emit_program(&self, program: &oxide_parser::Program) -> Result<IRFunction, String> {
|
||
crate::emit_debug!("emit_program: {} stmts", program.body.len());
|
||
let mut ctx = CompileCtx::new();
|
||
// 脚本顶层：var/function 声明需落到全局对象，let/const/class 不进全局。
|
||
ctx.is_global_scope = true;
|
||
self.predeclare_function_declarations(&program.body, &mut ctx);
|
||
|
||
// 预注册 builtin 引用（先于任何临时寄存器），builtin 槽不进入临时寄存器池。
|
||
self.pre_register_builtin_references(&program.body, &mut ctx);
|
||
|
||
// 预声明顶层 `var` 名，使首个 sub-pass 中提升的函数声明能解析外层 var。
|
||
self.predeclare_var_declarations(&program.body, &mut ctx);
|
||
|
||
// 预声明顶层 `let`/`const`/`class`（未初始化 TDZ 占位）。
|
||
self.predeclare_lexical_declarations(&program.body, &mut ctx);
|
||
|
||
// 闭包捕获分析（AST 级，emit 前确定）
|
||
ctx.own_bindings = self.collect_own_binding_names(&[], &program.body);
|
||
ctx.captured_bindings = self.collect_captured_bindings(&program.body, &[], &ctx.own_bindings);
|
||
|
||
// 首个 sub-pass：发函数声明（hoisting），保证任何代码运行前函数对象已就绪。
|
||
for stmt in &program.body {
|
||
if matches!(stmt, Statement::FunctionDeclaration(_)) {
|
||
self.emit_statement(stmt, &mut ctx)?;
|
||
}
|
||
}
|
||
|
||
// 第二个 sub-pass：发其余所有语句。
|
||
let mut last_result: Option<u32> = None;
|
||
for stmt in &program.body {
|
||
if matches!(stmt, Statement::FunctionDeclaration(_)) {
|
||
continue; // Already emitted above
|
||
}
|
||
match self.emit_statement(stmt, &mut ctx)? {
|
||
Some(r) => last_result = Some(r),
|
||
None => last_result = None,
|
||
}
|
||
}
|
||
if let Some(r) = last_result {
|
||
ctx.inst(Inst::new(OpCode::LOAD_VAR, Operand::None, Operand::Reg(r), Operand::None));
|
||
} else {
|
||
let undef_idx = ctx.add_constant(Constant::Undefined);
|
||
ctx.inst(Inst::load_const(Operand::None, undef_idx));
|
||
}
|
||
ctx.inst(Inst::new(OpCode::HALT, Operand::None, Operand::None, Operand::None));
|
||
|
||
let ir = ctx.assemble_ir(
|
||
oxide_ir::ParamLayout {
|
||
// 顶层模块无父函数：base 恒 0。曾用 builtin_reg_map.len()，harness 前缀
|
||
// 大时把模块自身低号 vreg 误判为父槽 → 恒等色收缩可分配色集、spill 增多。
|
||
base: 0,
|
||
count: 0,
|
||
},
|
||
None,
|
||
);
|
||
Ok(ir)
|
||
}
|
||
}
|
||
|
||
impl Default for Emitter {
|
||
fn default() -> Self {
|
||
Self::new()
|
||
}
|
||
}
|