globals.h

词法分析

/****************************************************/
/* File: globals.h                                  */
/* Global types and vars for C_Minus compiler       */
/* must come before other include files             */
/****************************************************/

#ifndef _GLOBALS_H_
#define _GLOBALS_H_

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

#ifndef FALSE
#define FALSE 0
#endif

#ifndef TRUE
#define TRUE 1
#endif

#define MAXRESERVED 6
 /* MAXTOKENLEN is the maximum size of a token */

#define BUFLEN 256

extern FILE* source;
extern FILE*  scan;//词法分析结果
extern FILE*  stree;//分析树
extern FILE*  parse;//语法分析结果
extern lineno;
extern int EchoSource;
extern int TraceScan;
extern int ParseError;
extern int Error;

 
static char lineBuf[BUFLEN]; /* holds the current line */
static int linepos = 0; /* current position in LineBuf */
static int bufsize = 0; /* current size of buffer string */
static int EOF_flag = FALSE; /* corrects ungetNextChar behavior on EOF */
static int tokenno=0; 
#define NontmlTypeNum (arg_list_+1)//一共为39+1=40个~一定要注意括号！
#define GrammarNum 73
#define GrammarMaxLength 9
#define TmlTypeNum EMPTY-arg_list_//70-39=31个
#define GrammarTokenNum  EMPTY//70+1=71个
typedef enum
{ 
     	program ,//0
		declaration_list,
		declaration_list_ ,  
		declaration,
		declaration_  ,//
		var_declaration,
		//var_declaration_ ,
		//type_specifier,
		fun_declaration,
		fun_declaration_ ,//
		params,
		param_list,
		param_list_ ,
		param,
		param_,
		compound_stmt,
		local_declarations,
		statement_list,
		statement,
		expression_stmt,
		selection_stmt,
		selection_stmt_,
		iteration_stmt, 
		return_stmt,
		return_stmt_,
		expression,
		var,
		var_,
		simple_expression,
		simple_expression_,
		relop,
		additive_expression,
		additive_expression_, 
		addop,
		term,
		term_,
		mulop,
		factor,
		call,
		args,
		arg_list,
		arg_list_//39
		
}  NontmlType;//非终结符 
typedef enum 
/* book-keeping tokens */
{ENDFILE=NontmlTypeNum,ERROR, 
/* reserved words */
IF,ELSE,INT,RETURN,VOID,WHILE,
/* multicharacter tokens */
ID,NUM,
/* special symbols */
ASSIGN,EQ,LT,GT,PLUS,MINUS,TIMES,OVER,LPAREN,RPAREN,SEMI,COMMA,LINDEX,RINDEX,LE,GE,LBRACE,RBRACE,NOEQ//
,EMPTY/*parsing tokens*/
} TokenType; 
/*所有终极符，取自单词的TokenType的枚举定义，可参考globals.h头文件*/
typedef TokenType  TmlType;
#endif