symbol_table.h

#ifndef PROJECT_SYMBOL_TABLE_H
#define PROJECT_SYMBOL_TABLE_H

#include "decls.h"
#include <unordered_map>  // hash table

struct symbol_info {
	type_t type;
	size_t addr;

	symbol_info(type_t type, size_t addr);
};
typedef unordered_map<std::string, symbol_info> symbol_table_t;

struct Scope {
	vector<Scope *> child;
	std::string name;
	Scope *parent;
	symbol_table_t symbol_table;
	size_t level;

	Scope();

	explicit Scope(Scope *parent_);

	Scope(Scope *parent_, const std::string &name_);

	~Scope();
};

extern Scope *GLOBAL;
extern Scope *current_scope;

void enter_scope();

void exit_scope();

void enter_scope(const std::string &scope_name);

int insert_symbol(const std::string &name, symbol_info type);

/* Lookups Return NONE if there is no such symbol. */
symbol_info local_lookup(const std::string &name);

symbol_info lookup(const std::string &name);

void print_symbol_table(char *file_name);

#endif //PROJECT_SYMBOL_TABLE_H