mirror of
https://github.com/pjh456/OxideJS.git
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246 lines
12 KiB
Rust
246 lines
12 KiB
Rust
//! 解构绑定/赋值 emit：数组与对象 pattern 的绑定初始化、rest 收集与解构赋值。
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//! 函数：`emit_bind_target`、`emit_binding_pattern`、`emit_array_binding`、
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//! `emit_object_binding`、`emit_assign_target` 等。
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use crate::{CompileCtx, Emitter};
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use oxide_ir::inst::Inst;
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use oxide_ir::operand::Operand;
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use oxide_bytecode::module::Constant;
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use oxide_bytecode::opcode::OpCode;
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use oxide_parser::{
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ArrayAssignmentTarget, ArrayPattern, AssignmentTarget, AssignmentTargetMaybeDefault, AssignmentTargetProperty,
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BindingPattern, Expression, ObjectAssignmentTarget, ObjectPattern, VariableDeclarationKind,
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};
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impl Emitter {
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fn emit_default_if_undefined(
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&self, val_reg: u8, default_expr: &Expression, ctx: &mut CompileCtx,
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) -> Result<u8, String> {
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let undef_reg = self.emit_undefined(ctx);
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let eq_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::STRICT_EQ, Operand::Reg(eq_reg as u32), Operand::Reg(val_reg as u32), Operand::Reg(undef_reg as u32)));
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// val != undefined（eq 为 false）→ 跳过默认值
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let end_label = ctx.next_label_id();
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ctx.inst(Inst::jmp_if_false(eq_reg, end_label));
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let default_reg = self.emit_expression(default_expr, ctx)?;
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ctx.inst(Inst::new(OpCode::LOAD_VAR, Operand::Reg(val_reg as u32), Operand::Reg(default_reg as u32), Operand::None));
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ctx.labels.set_label_pos(end_label, ctx.insts.len());
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Ok(val_reg)
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}
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fn emit_bind_target(
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&self, name: &str, src_reg: u8, kind: VariableDeclarationKind, is_const: bool, ctx: &mut CompileCtx,
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) -> Result<(), String> {
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let target_reg = if matches!(kind, VariableDeclarationKind::Var) {
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// `var` names are pre-declared (hoisting); reuse the pre-registered slot
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// instead of allocating a new one so n_registers matches let/const.
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if let Some(reg) = ctx.scopes.symbols.lookup_any(name) {
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reg
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} else {
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let var_reg = ctx.alloc_reg();
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ctx.declare(name, var_reg, kind, is_const)?;
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var_reg
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}
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} else {
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let var_reg = ctx.alloc_reg();
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ctx.declare(name, var_reg, kind, is_const)?;
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var_reg
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};
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if let Some(&cell_idx) = ctx.captured_bindings.get(name) {
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ctx.inst(Inst::new(OpCode::MAKE_CELL, Operand::Reg(src_reg as u32), Operand::Imm(cell_idx as u16), Operand::None));
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} else {
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ctx.inst(Inst::new(OpCode::STORE_VAR, Operand::Reg(target_reg as u32), Operand::Reg(src_reg as u32), Operand::Imm(if is_const { 1 } else { 0 })));
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}
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ctx.init_var(name);
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Ok(())
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}
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pub(crate) fn emit_assign_target(
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&self, target: &AssignmentTarget, src_reg: u8, ctx: &mut CompileCtx,
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) -> Result<(), String> {
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match target {
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AssignmentTarget::AssignmentTargetIdentifier(id) => {
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let name = id.name.as_str();
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let var_reg = ctx.lookup_or_global(name);
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ctx.inst(Inst::new(
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OpCode::STORE_VAR,
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Operand::Reg(var_reg as u32),
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Operand::Reg(src_reg as u32),
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Operand::Imm(if ctx.lookup_const_flag(name) { 1 } else { 0 }),
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));
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Ok(())
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}
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AssignmentTarget::ArrayAssignmentTarget(ap) => self.emit_array_assignment(ap, src_reg, ctx),
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AssignmentTarget::ObjectAssignmentTarget(op) => self.emit_object_assignment(op, src_reg, ctx),
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_ => Err("assignment target not supported".into()),
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}
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}
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pub(crate) fn emit_binding_pattern(
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&self, pattern: &BindingPattern, src_reg: u8, kind: VariableDeclarationKind, is_const: bool,
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ctx: &mut CompileCtx,
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) -> Result<(), String> {
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match pattern {
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BindingPattern::BindingIdentifier(bi) => {
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self.emit_bind_target(bi.name.as_str(), src_reg, kind, is_const, ctx)
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}
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BindingPattern::ArrayPattern(ap) => self.emit_array_binding(ap, src_reg, kind, is_const, ctx),
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BindingPattern::ObjectPattern(op) => self.emit_object_binding(op, src_reg, kind, is_const, ctx),
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BindingPattern::AssignmentPattern(ap) => {
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let val_reg = self.emit_default_if_undefined(src_reg, &ap.right, ctx)?;
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self.emit_binding_pattern(&ap.left, val_reg, kind, is_const, ctx)
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}
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}
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}
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fn emit_array_binding(
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&self, ap: &ArrayPattern, src_reg: u8, kind: VariableDeclarationKind, is_const: bool, ctx: &mut CompileCtx,
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) -> Result<(), String> {
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ctx.inst(Inst::new(OpCode::FOR_OF_INIT, Operand::None, Operand::Reg(src_reg as u32), Operand::None));
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for elem in &ap.elements {
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let has_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::FOR_OF_DONE, Operand::Reg(has_reg as u32), Operand::None, Operand::None));
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let val_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::FOR_OF_NEXT, Operand::Reg(val_reg as u32), Operand::None, Operand::None));
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if let Some(pattern) = elem {
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self.emit_binding_pattern(pattern, val_reg, kind, is_const, ctx)?;
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}
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}
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if let Some(rest) = &ap.rest {
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let rest_reg = self.emit_collect_rest_array(ctx)?;
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self.emit_binding_pattern(&rest.argument, rest_reg, kind, is_const, ctx)?;
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}
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ctx.inst(Inst::new(OpCode::FOR_OF_CLOSE, Operand::None, Operand::None, Operand::None));
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Ok(())
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}
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fn emit_collect_rest_array(&self, ctx: &mut CompileCtx) -> Result<u8, String> {
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let rest_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::NEW_ARRAY, Operand::Reg(rest_reg as u32), Operand::None, Operand::None));
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let idx_reg = ctx.alloc_reg();
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let zero_idx = ctx.add_constant(Constant::Int(0));
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ctx.inst(Inst::load_const(Operand::Reg(idx_reg as u32), zero_idx));
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let loop_start = ctx.next_label_id();
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let loop_end = ctx.next_label_id();
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ctx.labels.set_label_pos(loop_start, ctx.insts.len());
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let has_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::FOR_OF_DONE, Operand::Reg(has_reg as u32), Operand::None, Operand::None));
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ctx.inst(Inst::jmp_if_false(has_reg, loop_end));
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let val_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::FOR_OF_NEXT, Operand::Reg(val_reg as u32), Operand::None, Operand::None));
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ctx.inst(Inst::new(OpCode::SET_ELEM, Operand::Reg(rest_reg as u32), Operand::Reg(idx_reg as u32), Operand::Reg(val_reg as u32)));
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let tmp_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::INC_PRE, Operand::Reg(idx_reg as u32), Operand::Reg(tmp_reg as u32), Operand::Reg(tmp_reg as u32)));
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ctx.inst(Inst::jmp(loop_start));
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ctx.labels.set_label_pos(loop_end, ctx.insts.len());
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Ok(rest_reg)
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}
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fn emit_object_binding(
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&self, op: &ObjectPattern, src_reg: u8, kind: VariableDeclarationKind, is_const: bool, ctx: &mut CompileCtx,
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) -> Result<(), String> {
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let mut excluded = Vec::new();
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for prop in &op.properties {
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let (prop_reg, static_key) = self.emit_object_property_read_key(src_reg, &prop.key, prop.computed, ctx)?;
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if let Some(key) = static_key {
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excluded.push(key);
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}
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self.emit_binding_pattern(&prop.value, prop_reg, kind, is_const, ctx)?;
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}
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if let Some(rest) = &op.rest {
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let rest_reg = ctx.alloc_reg();
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let excluded_idx = ctx.add_constant(Constant::String(excluded.join("\0")));
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ctx.inst(Inst::rest_object(Operand::Reg(rest_reg as u32), Operand::Reg(src_reg as u32), excluded_idx as u32));
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self.emit_binding_pattern(&rest.argument, rest_reg, kind, is_const, ctx)?;
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}
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Ok(())
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}
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fn emit_assignment_maybe_default(
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&self, target: &AssignmentTargetMaybeDefault, src_reg: u8, ctx: &mut CompileCtx,
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) -> Result<(), String> {
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match target {
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AssignmentTargetMaybeDefault::AssignmentTargetWithDefault(default) => {
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let val_reg = self.emit_default_if_undefined(src_reg, &default.init, ctx)?;
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self.emit_assign_target(&default.binding, val_reg, ctx)
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}
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AssignmentTargetMaybeDefault::ArrayAssignmentTarget(ap) => self.emit_array_assignment(ap, src_reg, ctx),
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AssignmentTargetMaybeDefault::ObjectAssignmentTarget(op) => self.emit_object_assignment(op, src_reg, ctx),
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AssignmentTargetMaybeDefault::AssignmentTargetIdentifier(id) => {
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let name = id.name.as_str();
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let var_reg = ctx.lookup_or_global(name);
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ctx.inst(Inst::new(
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OpCode::STORE_VAR,
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Operand::Reg(var_reg as u32),
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Operand::Reg(src_reg as u32),
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Operand::Imm(if ctx.lookup_const_flag(name) { 1 } else { 0 }),
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));
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Ok(())
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}
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_ => Err("assignment target not supported".into()),
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}
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}
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pub(crate) fn emit_array_assignment(
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&self, ap: &ArrayAssignmentTarget, src_reg: u8, ctx: &mut CompileCtx,
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) -> Result<(), String> {
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ctx.inst(Inst::new(OpCode::FOR_OF_INIT, Operand::None, Operand::Reg(src_reg as u32), Operand::None));
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for elem in &ap.elements {
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let has_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::FOR_OF_DONE, Operand::Reg(has_reg as u32), Operand::None, Operand::None));
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let val_reg = ctx.alloc_reg();
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ctx.inst(Inst::new(OpCode::FOR_OF_NEXT, Operand::Reg(val_reg as u32), Operand::None, Operand::None));
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if let Some(target) = elem {
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self.emit_assignment_maybe_default(target, val_reg, ctx)?;
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}
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}
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if let Some(rest) = &ap.rest {
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let rest_reg = self.emit_collect_rest_array(ctx)?;
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self.emit_assign_target(&rest.target, rest_reg, ctx)?;
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}
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ctx.inst(Inst::new(OpCode::FOR_OF_CLOSE, Operand::None, Operand::None, Operand::None));
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Ok(())
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}
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pub(crate) fn emit_object_assignment(
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&self, op: &ObjectAssignmentTarget, src_reg: u8, ctx: &mut CompileCtx,
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) -> Result<(), String> {
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let mut excluded = Vec::new();
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for prop in &op.properties {
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match prop {
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AssignmentTargetProperty::AssignmentTargetPropertyIdentifier(id) => {
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let key = id.binding.name.as_str().to_string();
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excluded.push(key.clone());
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let mut prop_reg = self.emit_object_property_read(src_reg, &key, ctx);
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if let Some(default_expr) = &id.init {
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prop_reg = self.emit_default_if_undefined(prop_reg, default_expr, ctx)?;
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}
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let name = id.binding.name.as_str();
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let var_reg = ctx.lookup_or_global(name);
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ctx.inst(Inst::new(
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OpCode::STORE_VAR,
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Operand::Reg(var_reg as u32),
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Operand::Reg(prop_reg as u32),
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Operand::Imm(if ctx.lookup_const_flag(name) { 1 } else { 0 }),
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));
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}
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AssignmentTargetProperty::AssignmentTargetPropertyProperty(prop) => {
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let (prop_reg, static_key) =
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self.emit_object_property_read_key(src_reg, &prop.name, prop.computed, ctx)?;
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if let Some(key) = static_key {
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excluded.push(key);
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}
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self.emit_assignment_maybe_default(&prop.binding, prop_reg, ctx)?;
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}
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}
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}
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if let Some(rest) = &op.rest {
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let rest_reg = ctx.alloc_reg();
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let excluded_idx = ctx.add_constant(Constant::String(excluded.join("\0")));
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ctx.inst(Inst::rest_object(Operand::Reg(rest_reg as u32), Operand::Reg(src_reg as u32), excluded_idx as u32));
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self.emit_assign_target(&rest.target, rest_reg, ctx)?;
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}
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Ok(())
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}
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}
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