global.h

这是我自己实现的一个微小的编译程序,附可执行代码的虚拟机,是理解编译原理的绝好材料.

//Author:谭添升
#define ATTTAB_LEN 1000
#define SYMTAB_LEN 1000
#define NUM_INS	1000
#define NAME_LEN 1000

struct Symtable{
	int idname;
	int type;
	int place;
	int class;			/*identify a id from other token*/
	struct Jmplist * nextlist;
	struct Jmplist * truelist;
	struct Jmplist * falselist;
	double value;
	
};

typedef struct Code
{
	int op;
	union{
		int isrc1;
		double fsrc1;
	}src1;
	int src2;
	int dest;
}Code;

struct Jmplist					/*回填使用的转移指令表*/
{
	int index;
	struct Jmplist * next;
};

enum code_ops{op_cmov,op_fcmov,op_mov,op_add, op_minus, op_mult, op_div, op_mod, op_fadd, op_fminus, op_fmult, op_fdiv, op_a, op_ae, op_b, op_be, op_e, op_ne, op_and, op_or, op_xor ,
	op_neg, op_realtoint, op_inttoreal ,op_read,op_readf,op_write,op_writef,op_jmp,op_zjmp};