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

crates/oxide_emit/src/expr/call.rs

@@ -0,0 +1,123 @@
+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;
+
+impl Emitter {
+    fn emit_call_expression(&self, call: &oxide_parser::CallExpression, ctx: &mut CompileCtx) -> Result<u8, String> {
+        if matches!(&call.callee, Expression::Super(_)) {
+            if !ctx.in_derived_constructor {
+                return Err("super() only supported in derived constructors".into());
+            }
+            let mut arg_regs = Vec::new();
+            for arg in &call.arguments {
+                if let Some(expr) = arg.as_expression() {
+                    arg_regs.push(self.emit_expression(expr, ctx)?);
+                }
+            }
+            let first_arg_reg = if arg_regs.is_empty() { 0u8 } else { arg_regs[0] };
+            let result_reg = ctx.alloc_reg();
+            ctx.inst(Inst::super_call(
+                Operand::Reg(result_reg as u32),
+                Operand::Reg(first_arg_reg as u32),
+                arg_regs.len() as u8,
+            ));
+            if let Some(mut field_buffer) = ctx.field_buffer.take() {
+                let insert_inst = ctx.insts.len();
+                ctx.insts.append(&mut field_buffer.insts);
+                for (label, relative) in field_buffer.labels {
+                    ctx.labels.set_label_pos(label, insert_inst + relative);
+                }
+            }
+            return Ok(result_reg);
+        }
+        let (callee_reg, this_reg) = match &call.callee {
+            Expression::PrivateFieldExpression(member) => {
+                let obj_reg = self.emit_expression(&member.object, ctx)?;
+                let key_reg = self.emit_private_id_reg(member.field.name.as_str(), ctx)?;
+                let callee_reg = ctx.alloc_reg();
+                ctx.inst(Inst::new(OpCode::GET_PRIVATE, Operand::Reg(callee_reg as u32), Operand::Reg(obj_reg as u32), Operand::Reg(key_reg as u32)));
+                (callee_reg, obj_reg)
+            }
+            Expression::StaticMemberExpression(member) => {
+                let is_super_member = matches!(&member.object, Expression::Super(_));
+                let obj_reg = if is_super_member {
+                    let this_reg = ctx.alloc_reg();
+                    ctx.inst(Inst::new(OpCode::LOAD_VAR, Operand::Reg(this_reg as u32), Operand::This, Operand::None));
+                    this_reg
+                } else {
+                    self.emit_expression(&member.object, ctx)?
+                };
+                let prop_name = member.property.name.as_str();
+                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 callee_reg = ctx.alloc_reg();
+                if is_super_member {
+                    if !ctx.in_instance_method && !ctx.in_static_method && !ctx.in_derived_constructor {
+                        return Err("super property only supported in class methods".into());
+                    }
+                    let op = if ctx.in_static_method {
+                        OpCode::SUPER_STATIC_GET_PROP
+                    } else {
+                        OpCode::SUPER_GET_PROP
+                    };
+                    ctx.inst(Inst::new(op, Operand::Reg(callee_reg as u32), Operand::Reg(obj_reg as u32), Operand::Reg(key_reg as u32)));
+                } else {
+                    ctx.inst(Inst::new(OpCode::LOAD_VAR, Operand::Reg(callee_reg as u32), Operand::Reg(obj_reg as u32), Operand::None));
+                    ctx.inst(Inst::ic_get(Operand::Reg(callee_reg as u32), Operand::Reg(key_reg as u32)));
+                }
+                (callee_reg, obj_reg)
+            }
+            _ => {
+                let callee_reg = self.emit_expression(&call.callee, ctx)?;
+                let this_idx = ctx.add_constant(Constant::Undefined);
+                let this_reg = ctx.alloc_reg();
+                ctx.inst(Inst::load_const(Operand::Reg(this_reg as u32), this_idx));
+                (callee_reg, this_reg)
+            }
+        };
+        let mut arg_regs = Vec::new();
+        for arg in &call.arguments {
+            if let Some(expr) = arg.as_expression() {
+                arg_regs.push(self.emit_expression(expr, ctx)?);
+            }
+        }
+        let first_arg_reg = if arg_regs.is_empty() { 0u8 } else { arg_regs[0] };
+        let op = match &call.callee {
+            Expression::Identifier(ident) if ctx.is_builtin(ident.name.as_str()) => OpCode::CALL_NATIVE,
+            _ => OpCode::CALL,
+        };
+        match op {
+            OpCode::CALL => {
+                ctx.inst(Inst::call(
+                    Operand::Reg(callee_reg as u32),
+                    Operand::Reg(this_reg as u32),
+                    Operand::Reg(first_arg_reg as u32),
+                    arg_regs.len() as u8,
+                ));
+            }
+            OpCode::CALL_NATIVE => {
+                ctx.inst(Inst::call_native(
+                    Operand::Reg(callee_reg as u32),
+                    Operand::Reg(this_reg as u32),
+                    Operand::Reg(first_arg_reg as u32),
+                    arg_regs.len() as u8,
+                ));
+            }
+            _ => unreachable!(),
+        }
+        let result_reg = ctx.alloc_reg();
+        ctx.inst(Inst::new(OpCode::LOAD_VAR, Operand::Reg(result_reg as u32), Operand::None, Operand::None));
+        Ok(result_reg)
+    }
+
+    pub(crate) fn emit_call_domain(&self, expr: &Expression, ctx: &mut CompileCtx) -> Result<u8, String> {
+        match expr {
+            Expression::CallExpression(call) => self.emit_call_expression(call, ctx),
+            _ => self.emit_unsupported_expression(expr, ctx),
+        }
+    }
+}