/****************************************************//* File: globals.h                                  *//* Global types and vars for TINY compiler          *//* must come before other include files             *//* Compiler Construction: Principles and Practice   *//* Kenneth C. Louden                                *//****************************************************/#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/* MAXRESERVED = the number of reserved words */#define MAXRESERVED 8typedef enum     /* book-keeping tokens */   {ENDFILE,ERROR,    /* reserved words */    IF,THEN,ELSE,END,REPEAT,UNTIL,READ,WRITE,    /* multicharacter tokens */    ID,NUM,    /* special symbols */    ASSIGN,EQ,LT,PLUS,MINUS,TIMES,OVER,LPAREN,RPAREN,SEMI   } TokenType;extern FILE* source; /* source code text file */extern FILE* listing; /* listing output text file */extern FILE* code; /* code text file for TM simulator */extern int lineno; /* source line number for listing *//**************************************************//***********   Syntax tree for parsing ************//**************************************************/typedef enum {StmtK,ExpK} NodeKind;typedef enum {IfK,RepeatK,AssignK,ReadK,WriteK} StmtKind;typedef enum {OpK,ConstK,IdK} ExpKind;/* ExpType is used for type checking */typedef enum {Void,Integer,Boolean} ExpType;#define MAXCHILDREN 3typedef struct treeNode   { struct treeNode * child[MAXCHILDREN];     struct treeNode * sibling;     int lineno;     NodeKind nodekind;     union { StmtKind stmt; ExpKind exp;} kind;     union { TokenType op;             int val;             char * name; } attr;     ExpType type; /* for type checking of exps */   } TreeNode;/**************************************************//***********   Flags for tracing       ************//**************************************************//* EchoSource = TRUE causes the source program to * be echoed to the listing file with line numbers * during parsing */extern int EchoSource;/* TraceScan = TRUE causes token information to be * printed to the listing file as each token is * recognized by the scanner */extern int TraceScan;/* TraceParse = TRUE causes the syntax tree to be * printed to the listing file in linearized form * (using indents for children) */extern int TraceParse;/* TraceAnalyze = TRUE causes symbol table inserts * and lookups to be reported to the listing file */extern int TraceAnalyze;/* TraceCode = TRUE causes comments to be written * to the TM code file as code is generated */extern int TraceCode;/* Error = TRUE prevents further passes if an error occurs */extern int Error; #endif