symtab.h

小型编译系统的源代码

#ifndef _SYMTAB_H_
#define _SYMTAB_H_

#define SUCCESS     0   //valid entry found
#define FAIL       -1   //entry unfound
#define UNCONFORM  -2   //for funtion definition, parameter uncomform to former declare
#define INVALID    -3
struct entryType{
		ExpType type;
		VarKind varK;
};
 
struct paramType{
		entryType type;
		paramType * next;
		paramType(){
			next = NULL;
		}
};

struct Result{
	paramType * params;
	ExpType etype;   //Int, Char , Boolean,  Float
	VarKind vark;    //Norm, Array, Func
	int memloc;
	int size;
	bool local;
	Result(){
		etype = Void;
		params = NULL;
	}
};
/* Procedure st_insert inserts line numbers and
 * memory locations into the symbol table
 * loc = memory location is inserted only the
 * first time, otherwise ignored
 */
int st_insert( char * name, int lineno, ExpType type, ExpKind kind, int size = -1);
int st_insert( char * name, int lineno, ExpType type, TreeNode * params); 

/* Function st_lookup returns the memory 
 * location of a variable or -1 if not found
 */
int st_lookup ( char * , Result &);

int st_funclookup(char *, ExpType, TreeNode * params);

int st_funclookup(char *, Result &);

/* Procedure st_setLoc  set a variable's memory location
 *
 */
int st_setLoc(char * ,int );

/* Function st_newBuck notes that the procedure enters
 * a new compoud statement
 */
void st_newBuck();

/* Function st_delBuck notes that the procedure leaves
 * a compoud statement
 */
void st_delBuck();

void st_reset();

// Enters a new Function definition part
void st_inFunc(char * name);

//Leaves a Function definition part
void st_outFunc();

/* Procedure printSymTab prints a formatted 
 * listing of the symbol table contents 
 * to the listing file
 */
void printSymTab(FILE * listing);


#endif