fix(ast): 删掉ast结构

src/irgen/IRGenDecl.cpp

@@ -1,39 +1,36 @@
-// 声明翻译模块：
-// - 处理全局变量与局部变量声明
-// - 处理数组初始化、空间分配与初值生成等
-
 #include "irgen/IRGen.h"
 
-#include <memory>
 #include <stdexcept>
 
-#include "ast/AstNodes.h"
+#include "SysYParser.h"
 #include "ir/IR.h"
 
-void IRGenImpl::GenBlock(const ast::Block& block) {
-  // 先为所有局部变量创建栈槽，使 alloca 聚集在入口块前部。
-  for (const auto& decl : block.varDecls) {
-    auto* slot = builder_.CreateAllocaI32(ir::DefaultContext().NextTemp());
-    locals_[decl->name] = slot;
+void IRGenImpl::GenBlock(SysYParser::BlockContext& block) {
+  for (auto* stmt : block.stmt()) {
+    if (stmt && stmt->varDecl()) {
+      const std::string name = stmt->varDecl()->Ident()->getText();
+      auto* slot = builder_.CreateAllocaI32(ir::DefaultContext().NextTemp());
+      locals_[name] = slot;
+    }
   }
 
-  for (const auto& decl : block.varDecls) {
-    GenVarDecl(*decl);
-  }
-  for (const auto& stmt : block.stmts) {
-    GenStmt(*stmt);
+  for (auto* stmt : block.stmt()) {
+    if (stmt) {
+      GenStmt(*stmt);
+    }
   }
 }
 
-void IRGenImpl::GenVarDecl(const ast::VarDecl& decl) {
-  auto it = locals_.find(decl.name);
+void IRGenImpl::GenVarDecl(SysYParser::VarDeclContext& decl) {
+  const std::string name = decl.Ident()->getText();
+  auto it = locals_.find(name);
   if (it == locals_.end()) {
-    throw std::runtime_error("[irgen] 变量栈槽未创建: " + decl.name);
+    throw std::runtime_error("[irgen] 变量栈槽未创建: " + name);
   }
 
   ir::Value* init = nullptr;
-  if (decl.init) {
-    init = GenExpr(*decl.init);
+  if (decl.exp()) {
+    init = GenExpr(*decl.exp());
   } else {
     init = ir::DefaultContext().GetConstInt(0);
   }