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42 lines
1.1 KiB
42 lines
1.1 KiB
// 符号表：记录局部变量/常量/参数定义。
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#pragma once
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#include <optional>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include "SysYParser.h"
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enum class BaseTypeKind { Int, Float, Void };
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struct TypeDesc {
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BaseTypeKind base = BaseTypeKind::Int;
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std::vector<int> dims; // 为空表示标量；数组维度允许首维为 -1 表示形参不定长
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bool is_const = false;
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};
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enum class SymbolKind { Var, Const, Param };
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struct SymbolEntry {
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SymbolKind kind = SymbolKind::Var;
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SysYParser::VarDefContext* var_decl = nullptr;
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SysYParser::ConstDefContext* const_decl = nullptr;
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SysYParser::FuncFParamContext* param_decl = nullptr;
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TypeDesc type; // 记录类型信息
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bool is_const = false;
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std::optional<int> const_value;
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};
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class SymbolTable {
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public:
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void EnterScope();
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void ExitScope();
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bool ContainsInCurrentScope(const std::string& name) const;
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void Add(const std::string& name, const SymbolEntry& entry);
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const SymbolEntry* Lookup(const std::string& name) const;
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private:
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std::vector<std::unordered_map<std::string, SymbolEntry>> scopes_;
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}; |