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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 <vector>
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#include <unordered_map>
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#include "antlr4/SysYBaseVisitor.h"
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#include "antlr4/SysYParser.h"
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#include "ir/IR.h"
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#include "sem/Sema.h"
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// 前向声明：语义层可能在未来提供更明确的符号类型，用于把符号唯一标识映射到 IR 对象。
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struct SemanticVarSymbol;
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struct SemanticFuncSymbol;
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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, const SemanticContext& 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 visitBlockStmt(SysYParser::BlockStmtContext* 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 visitVarDecl(SysYParser::VarDeclContext* 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 visitReturnStmt(SysYParser::ReturnStmtContext* ctx) override;
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std::any visitExp(SysYParser::ExpContext* ctx) override;
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std::any visitCond(SysYParser::CondContext* 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 visitLValue(SysYParser::LValueContext* 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 visitAddExp(SysYParser::AddExpContext* 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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// 辅助接口：数组下标地址计算与全局变量生成
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ir::Value* EmitArrayIndex(ir::Value* base_ptr, SysYParser::ExpContext* idx_expr);
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void EmitGlobalVariable(SysYParser::VarDefContext* ctx);
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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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struct LoopTargets {
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ir::BasicBlock* continue_target;
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ir::BasicBlock* break_target;
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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::Value* EvalCond(SysYParser::CondContext& cond);
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ir::Value* ToBoolValue(ir::Value* v);
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ir::Value* FindInScope(const std::string& name);
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std::string NextBlockName();
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ir::Function* FindFunctionByName(const std::string& name);
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ir::Value* ResolveLValueAddress(SysYParser::LValueContext* ctx);
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ir::Module& module_;
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const SemanticContext& sema_;
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ir::Function* func_;
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ir::IRBuilder builder_;
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bool in_function_ = false;
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// 当前函数的参数对应的栈槽位（在函数入口处为每个形参分配的 alloca）
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std::vector<ir::Value*> param_slots_;
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// 将 Sema 提供的变量符号映射到对应的存储槽位（避免仅按名字查找）
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std::unordered_map<const SemanticVarSymbol*, ir::Value*> symbol_storage_map_;
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// 将 Sema 提供的函数符号映射到已创建的 IR 函数对象
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std::unordered_map<const SemanticFuncSymbol*, ir::Function*> func_symbol_map_;
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// 作用域栈：每个作用域维护一个从名称到存储槽位的映射
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std::vector<std::unordered_map<std::string, ir::Value*>> scope_storage_;
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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<SysYParser::VarDefContext*, ir::Value*> storage_map_;
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// 保留按名字的映射以兼容现有代码路径，但优先使用 symbol_storage_map_
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std::unordered_map<std::string, ir::Value*> named_storage_;
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std::vector<LoopTargets> loop_stack_;
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};
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std::unique_ptr<ir::Module> GenerateIR(SysYParser::CompUnitContext& tree,
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const SemanticContext& sema);
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