symtable.h

一个c语言的编译器的源代码

#ifndef SYMTABLE_H_
#define SYMTABLE_H_

#define BUCKET_SIZE 211     // Size of the hash symbol table

#include <string>
#include "global.h"
#include "parse.h"

using namespace std;

// For recording symbols
typedef struct symbolrecord{
	symbolrecord * pNext;
	string name;
	Type type;
	SymbolType symboltype;

	//used only in function declaration
	TreeNode * pParamList;
	int paramAlloc; //memory params take up
	int localAlloc; //memory local-vars take up

	int nestlevel;
	int location;
	int lineno;
} SymbolRecord;

// Symbol table(hash table)
typedef struct bucketlist{
	bucketlist * pNext;
	SymbolRecord * pRecord[BUCKET_SIZE];
} BucketList;

extern int nestlevel;

extern BucketList GlobalBucket;

extern BucketList * pSymbolTable;

extern BucketList * pCurrentST;

void st_addon(BucketList *p);

void st_takeoff();

BucketList * st_new();

SymbolRecord * st_insert(const string &name, const Type type,
               const SymbolType symboltype,
			   int location,int lineno);

SymbolRecord * st_lookup(const string &name);

#endif