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// 将语法树翻译为 IR。
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// 实现拆分在 IRGenFunc/IRGenStmt/IRGenExp/IRGenDecl。
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#pragma once
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#include <any>
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include "SysYBaseVisitor.h"
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#include "SysYParser.h"
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#include "ir/IR.h"
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#include "sem/Sema.h"
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namespace ir {
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class Module;
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class Function;
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class IRBuilder;
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class Value;
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}
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class IRGenImpl final : public SysYBaseVisitor {
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public:
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IRGenImpl(ir::Module& module, IRGenContext& sema);
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std::any visitCompUnit(SysYParser::CompUnitContext* ctx) override;
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std::any visitFuncDef(SysYParser::FuncDefContext* ctx) override;
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std::any visitBlock(SysYParser::BlockContext* ctx) override;
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std::any visitBlockItem(SysYParser::BlockItemContext* ctx) override;
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std::any visitDecl(SysYParser::DeclContext* ctx) override;
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std::any visitStmt(SysYParser::StmtContext* ctx) override;
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std::any visitVarDef(SysYParser::VarDefContext* ctx) override;
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std::any visitPrimaryExp(SysYParser::PrimaryExpContext* ctx) override;
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std::any visitNumber(SysYParser::NumberContext* ctx) override;
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std::any visitLVal(SysYParser::LValContext* ctx) override;
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std::any visitAddExp(SysYParser::AddExpContext* ctx) override;
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std::any visitUnaryExp(SysYParser::UnaryExpContext* ctx) override;
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std::any visitMulExp(SysYParser::MulExpContext* ctx) override;
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std::any visitRelExp(SysYParser::RelExpContext* ctx) override;
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std::any visitEqExp(SysYParser::EqExpContext* ctx) override;
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std::any visitLAndExp(SysYParser::LAndExpContext* ctx) override;
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std::any visitLOrExp(SysYParser::LOrExpContext* ctx) override;
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std::any visitConstDef(SysYParser::ConstDefContext* ctx) override;
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private:
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enum class BlockFlow {
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Continue,
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Terminated,
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};
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BlockFlow VisitBlockItemResult(SysYParser::BlockItemContext& item);
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ir::Value* EvalExpr(SysYParser::ExpContext& expr);
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ir::Module& module_;
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IRGenContext& sema_;
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ir::Function* func_;
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ir::IRBuilder builder_;
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// 名称绑定由 Sema 负责；IRGen 只维护“声明 -> 存储槽位”的代码生成状态。
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std::unordered_map<antlr4::ParserRuleContext*, ir::Value*> storage_map_;
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// 额外增加按名称的快速映射，以防有时无法直接通过声明节点指针匹配。
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std::unordered_map<std::string, ir::Value*> name_map_;
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// 常量名称到整数值的快速映射（供数组维度解析使用）
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std::unordered_map<std::string, long> const_values_;
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// 当前正在处理的声明基础类型（由 visitDecl 设置，visitVarDef/visitConstDef 使用）
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std::string current_btype_;
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std::vector<ir::BasicBlock*> break_targets_;
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std::vector<ir::BasicBlock*> continue_targets_;
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};
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std::unique_ptr<ir::Module> GenerateIR(SysYParser::CompUnitContext& tree,
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IRGenContext& sema);
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