refactor: 拆分 counter expression 计数分发

crates/oxide_compiler/src/counter/expr/literal.rs

@@ -0,0 +1,29 @@
+use super::*;
+
+impl Compiler {
+    pub(in crate::counter) fn count_this_expression(&self, ctx: &mut CompileCtx) {
+        ctx.alloc_reg();
+        ctx.projected_pc += 1; // LOAD_VAR from reg 254
+    }
+
+    pub(in crate::counter) fn count_identifier_expression(&self, expr: &Expression, ctx: &mut CompileCtx) {
+        let Expression::Identifier(ident) = expr else {
+            return;
+        };
+        if CompileCtx::is_known_builtin(ident.name.as_str()) {
+            let _ = ctx.lookup_or_builtin(ident.name.as_str());
+        }
+        ctx.alloc_reg();
+        ctx.projected_pc += 1; // LOAD_VAR
+    }
+
+    pub(in crate::counter) fn count_regexp_literal(&self, ctx: &mut CompileCtx) {
+        ctx.alloc_reg();
+        ctx.projected_pc += 1;
+    }
+
+    pub(in crate::counter) fn count_default_expression(&self, ctx: &mut CompileCtx) {
+        ctx.alloc_reg();
+        ctx.projected_pc += 1; // LOAD_CONST or LOAD_VAR
+    }
+}