globals.h

小型编译系统的源代码

#ifndef GLOBALS_H
#define GLOBALS_H

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

#define FALSE 0
#define TRUE  1

#define INT 257
#define CHAR 258
#define FLOAT 259
#define VOID 260
#define IF 261
#define ELSE 262
#define WHILE 263
#define FOR 264
#define RETURN 265
#define ID 266
#define NUM 267
#define FLOATNUM 268
#define CONSTCHAR 269
#define AND 270
#define OR 271
#define NOT 272
#define ASSIGN 273
#define EQ 274
#define LT 275
#define LE 276
#define GT 277
#define GE 278
#define NE 279
#define PLUS 280
#define MINUS 281
#define TIMES 282
#define OVER 283
#define LPAREN 284
#define RPAREN 285
#define SEMICOLON 286
#define COMMA 287
#define LBRACKET 288
#define RBRACKET 289
#define LBRACE 290
#define RBRACE 291
#define ERROR 292
#define ENDFILE 293

typedef int TokenType; 

extern FILE *source;	/* source code text file */
extern FILE* listing;	/* listing output text file */
extern FILE* code;		/* P-code text file */

extern FILE* yyin;
extern FILE* yyout;

/**************************************************/
/***********   Syntax tree for parsing ************/
/**************************************************/

enum NodeKind {StmtK,ExpK,DeclK};
enum StmtKind {IfK,WhileK,ForK,ReturnK,CompoundK};
enum ExpKind  {TypeK,OpK,NotK,ArrayK,ConstK,IdK,CallK};
enum DeclKind {VarDeclK,FuncDeclK,FuncDefK,ParamK};

/* ExpType is used for type checking */
enum ExpType {Void,Integer,Boolean,Char,Float};
enum VarKind {Func,Array,Norm};

#define MAXCHILDREN 4

struct TreeNode
{
  struct TreeNode * child[MAXCHILDREN];
  struct TreeNode * sibling;
  int lineno;
  NodeKind nodekind;
  union
  {
		StmtKind stmt; 
		ExpKind exp;
		DeclKind decl;
  } kind;
  struct
  { 
    TokenType op;
    int vali;
		float valf;
		char valch;
    char *name;
		ExpType vartype;
  } attr;
  ExpType type; /* for type checking of exps */
	VarKind varK;
};

extern int lineno;	/* source line number for listing */

/**************************************************/
/***********   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 //GLOBAL_H