refactor(compiler): 拆分 oxide_emit 为独立 emit pass crate（依赖倒置）

crates/oxide_emit/src/expr/object/array.rs

@@ -0,0 +1,27 @@
+use crate::{CompileCtx, Emitter};
+use oxide_ir::inst::Inst;
+use oxide_ir::operand::Operand;
+use oxide_bytecode::module::Constant;
+use oxide_bytecode::opcode::OpCode;
+impl Emitter {
+    pub(crate) fn emit_array_expression(
+        &self, arr: &oxide_parser::ArrayExpression, ctx: &mut CompileCtx,
+    ) -> Result<u8, String> {
+        let arr_reg = ctx.alloc_reg();
+        let n = arr.elements.len() as u16;
+        ctx.inst(Inst::new(OpCode::NEW_ARRAY, Operand::Reg(arr_reg as u32), Operand::Imm(n), Operand::None));
+        let elem_checkpoint = ctx.reg_checkpoint();
+        for (i, elem) in arr.elements.iter().enumerate() {
+            let Some(e) = elem.as_expression() else {
+                return Err("spread not supported".into());
+            };
+            let val_reg = self.emit_expression(e, ctx)?;
+            let idx_reg = ctx.alloc_reg();
+            let idx = ctx.add_constant(Constant::Int(i as i32));
+            ctx.inst(Inst::load_const(Operand::Reg(idx_reg as u32), idx));
+            ctx.inst(Inst::new(OpCode::SET_ELEM, Operand::Reg(arr_reg as u32), Operand::Reg(idx_reg as u32), Operand::Reg(val_reg as u32)));
+            ctx.restore_reg_checkpoint(elem_checkpoint);
+        }
+        Ok(arr_reg)
+    }
+}

crates/oxide_emit/src/expr/object/mod.rs

@@ -0,0 +1,15 @@
+use crate::{CompileCtx, Emitter};
+use oxide_parser::Expression;
+
+mod array;
+mod object_literal;
+
+impl Emitter {
+    pub(crate) fn emit_object_domain(&self, expr: &Expression, ctx: &mut CompileCtx) -> Result<u8, String> {
+        match expr {
+            Expression::ObjectExpression(obj) => self.emit_object_expression(obj, ctx),
+            Expression::ArrayExpression(arr) => self.emit_array_expression(arr, ctx),
+            _ => self.emit_unsupported_expression(expr, ctx),
+        }
+    }
+}

crates/oxide_emit/src/expr/object/object_literal.rs

@@ -0,0 +1,62 @@
+use crate::{CompileCtx, Emitter};
+use oxide_ir::inst::Inst;
+use oxide_ir::operand::Operand;
+use oxide_bytecode::module::Constant;
+use oxide_bytecode::opcode::OpCode;
+use oxide_parser::{Expression, ObjectPropertyKind, PropertyKey, PropertyKind};
+
+impl Emitter {
+    pub(crate) fn emit_object_expression(
+        &self, obj: &oxide_parser::ObjectExpression, ctx: &mut CompileCtx,
+    ) -> Result<u8, String> {
+        let obj_reg = ctx.alloc_reg();
+        ctx.inst(Inst::new(OpCode::NEW_OBJECT, Operand::Reg(obj_reg as u32), Operand::None, Operand::None));
+        let prop_checkpoint = ctx.reg_checkpoint();
+        for prop in &obj.properties {
+            let ObjectPropertyKind::ObjectProperty(p) = prop else {
+                return Err("spread properties not yet supported".into());
+            };
+            let prop_name = match &p.key {
+                PropertyKey::StaticIdentifier(ident) => ident.name.as_str().to_string(),
+                PropertyKey::StringLiteral(s) => s.value.to_string(),
+                _ => return Err("unsupported object property key type".into()),
+            };
+            match p.kind {
+                PropertyKind::Get | PropertyKind::Set => {
+                    let accessor_reg = self.emit_expression(&p.value, ctx)?;
+                    if let Some(sub_mod) = ctx.nested.last_mut() {
+                        sub_mod.function_name = Some(prop_name.to_string());
+                    }
+                    let undef_reg = self.emit_undefined(ctx);
+                    let (get_reg, set_reg) = if p.kind == PropertyKind::Get {
+                        (accessor_reg, undef_reg)
+                    } else {
+                        (undef_reg, accessor_reg)
+                    };
+                    let idx = ctx.add_constant(Constant::String(prop_name.to_string()));
+                    ctx.inst(Inst::define_accessor(
+                        Operand::Reg(obj_reg as u32),
+                        Operand::Reg(get_reg as u32),
+                        Operand::Reg(set_reg as u32),
+                        idx as u32,
+                    ));
+                    ctx.restore_reg_checkpoint(prop_checkpoint);
+                }
+                _ => {
+                    let idx = ctx.add_constant(Constant::String(prop_name.to_string()));
+                    let key_reg = ctx.alloc_reg();
+                    ctx.inst(Inst::load_const(Operand::Reg(key_reg as u32), idx));
+                    let val_reg = self.emit_expression(&p.value, ctx)?;
+                    if matches!(&p.value, Expression::ArrowFunctionExpression(_)) {
+                        if let Some(sub_mod) = ctx.nested.last_mut() {
+                            sub_mod.function_name = Some(prop_name.to_string());
+                        }
+                    }
+                    ctx.inst(Inst::new(OpCode::SET_PROP, Operand::Reg(obj_reg as u32), Operand::Reg(val_reg as u32), Operand::Reg(key_reg as u32)));
+                    ctx.restore_reg_checkpoint(prop_checkpoint);
+                }
+            }
+        }
+        Ok(obj_reg)
+    }
+}