fix(ast): 删掉ast结构

src/frontend/AstBuilder.cpp

@@ -1,114 +0,0 @@
-// 将 parse tree 转换为 AST。
-#include "frontend/AstBuilder.h"
-
-#include <any>
-#include <stdexcept>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "SysYBaseVisitor.h"
-#include "SysYParser.h"
-#include "ast/AstNodes.h"
-#include "antlr4-runtime.h"
-
-namespace {
-
-using ast::BinaryExpr;
-using ast::BinaryOp;
-using ast::Block;
-using ast::CompUnit;
-using ast::FuncDef;
-using ast::NumberExpr;
-using ast::ReturnStmt;
-using ast::VarDecl;
-using ast::VarExpr;
-
-template <typename T>
-T Take(std::any&& value) {
-  if (auto* ptr = std::any_cast<T>(&value)) {
-    return std::move(*ptr);
-  }
-  throw std::runtime_error("AST 构建失败：类型不匹配");
-}
-
-class Builder : public SysYBaseVisitor {
- public:
-  std::any visitCompUnit(SysYParser::CompUnitContext* ctx) override {
-    auto func = Take<std::shared_ptr<FuncDef>>(visit(ctx->funcDef()));
-    return std::make_shared<CompUnit>(std::move(func));
-  }
-
-  std::any visitFuncDef(SysYParser::FuncDefContext* ctx) override {
-    auto body = Take<std::shared_ptr<Block>>(visit(ctx->block()));
-    return std::make_shared<FuncDef>("main", std::move(body));
-  }
-
-  std::any visitBlock(SysYParser::BlockContext* ctx) override {
-    auto block = std::make_shared<Block>();
-    for (auto stmtCtx : ctx->stmt()) {
-      if (stmtCtx->varDecl()) {
-        block->varDecls.emplace_back(
-            Take<std::shared_ptr<VarDecl>>(visit(stmtCtx->varDecl())));
-      } else if (stmtCtx->returnStmt()) {
-        block->stmts.emplace_back(
-            Take<std::shared_ptr<ReturnStmt>>(visit(stmtCtx->returnStmt())));
-      }
-    }
-    return block;
-  }
-
-  std::any visitVarDecl(SysYParser::VarDeclContext* ctx) override {
-    std::shared_ptr<ast::Expr> init;
-    if (ctx->exp()) {
-      init = Take<std::shared_ptr<ast::Expr>>(visit(ctx->exp()));
-    }
-    return std::make_shared<VarDecl>(ctx->Ident()->getText(), std::move(init));
-  }
-
-  std::any visitReturnStmt(SysYParser::ReturnStmtContext* ctx) override {
-    auto expr = Take<std::shared_ptr<ast::Expr>>(visit(ctx->exp()));
-    return std::make_shared<ReturnStmt>(std::move(expr));
-  }
-
-  std::any visitExp(SysYParser::ExpContext* ctx) override {
-    return visit(ctx->addExp());
-  }
-
-  std::any visitAddExp(SysYParser::AddExpContext* ctx) override {
-    auto node = Take<std::shared_ptr<ast::Expr>>(visit(ctx->primary(0)));
-    for (size_t i = 1; i < ctx->primary().size(); ++i) {
-      auto rhs = Take<std::shared_ptr<ast::Expr>>(visit(ctx->primary(i)));
-      auto opToken = ctx->AddOp(i - 1);
-      BinaryOp op = BinaryOp::Add;
-      if (opToken->getText() == "-") op = BinaryOp::Sub;
-      node = std::make_shared<BinaryExpr>(op, std::move(node), std::move(rhs));
-    }
-    return node;
-  }
-
-  std::any visitPrimary(SysYParser::PrimaryContext* ctx) override {
-    if (ctx->Number()) {
-      std::shared_ptr<ast::Expr> expr =
-          std::make_shared<NumberExpr>(std::stoi(ctx->Number()->getText()));
-      return expr;
-    }
-    if (ctx->Ident()) {
-      std::shared_ptr<ast::Expr> expr =
-          std::make_shared<VarExpr>(ctx->Ident()->getText());
-      return expr;
-    }
-    return visit(ctx->exp());
-  }
-};
-
-}  // namespace
-
-std::shared_ptr<ast::CompUnit> BuildAst(antlr4::tree::ParseTree* tree) {
-  if (!tree) {
-    throw std::runtime_error("parse tree 为空");
-  }
-  Builder visitor;
-  auto result = visitor.visit(tree);
-  return Take<std::shared_ptr<ast::CompUnit>>(std::move(result));
-}

src/frontend/AstBuilder.h

@@ -1,16 +0,0 @@
-// 将 ANTLR parse tree 转换为内部 AST。
-#pragma once
-
-#include <memory>
-
-namespace antlr4 {
-namespace tree {
-class ParseTree;
-}
-}  // namespace antlr4
-
-namespace ast {
-struct CompUnit;
-}
-
-std::shared_ptr<ast::CompUnit> BuildAst(antlr4::tree::ParseTree* tree);

src/frontend/CMakeLists.txt

@@ -1,11 +1,9 @@
 add_library(frontend STATIC
   AntlrDriver.cpp
-  AstBuilder.cpp
 )
 
 target_link_libraries(frontend PUBLIC
   build_options
-  ast
   "${ANTLR4_RUNTIME_TARGET}"
 )