code.h

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/* code.h
 * TM code emitting utilities for the TINY compiler
 * and interface to the TM machine
 *
 * Compiler Construction: Principles and Practice
 * Kenneth C. Louden
 * 编译原理及实践
 * (美) Kenneth C. Louden 著
 * 冯博琴 冯岚 等译
 * 机械工业出版社 IBSN 7-111-07703-2
 * 源代码：zwf编辑并修订
 * Code Modify: 
 */

#ifndef _CODE_H_
#define _CODE_H_

/* pc = program counter */
#define pc 7

/* mp = "memory poniter" points
 * to top of memory (for temp storage)
 */
#define mp 6

/* gp = "global pointer" points
 * to bottom of memory for (global)
 * variabl storage
 */
#define gp 5

/* accumulator */
#define ac 0

/* 2nd accumulator */
#define ac1 1

/* code emitting utilities */

/* Procedure emitRO emits a register-only
 * TM instruction
 * op = the opcode
 * r = target register
 * s = 1st source register
 * t = 2nd source register
 * c = a comment to be printed if TraceCode is TRUE
 */
void emitRO(char *op, int r, int s, int t, char *c);

/* Procedure emitRM emits a register-to-memory
 * TM instruction
 * op = the opcode
 * r = target register
 * d = the offset
 * s = the base register
 * c = a comment to be printed if TraceCode is TRUE
 */
void emitRM(char *op, int r, int d, int s, char *c);

/* Function emitSkip skips "howMany" code
 * locations for later backpatch, It also
 * return the current code position
 */
int emitSkip(int howMany);

/* Procedure emitBackup backs up to
 * loc = a previously skipped location
 */
void emitBackup(int loc);

/* Procedure emitRestore restores the current
 * code position to the highest previously
 * unemitted position
 */
void emitRestore(void);

/* Procedure emitComment prints a comment line
 * with comment c in the code file
 */
void emitComment(char *c);

/* Procedure emitRM_Abs converts an absolute reference
 * to a pc-relative reference when emitting a
 * register-to-memory TM instruction
 * op = the opcode
 * r = target register
 * a = the absolute location in memory
 * c = a comment to be printed if TraceCode is TRUE
 */
void emitRM_Abs(char *op, int r, int a, char *c);

#endif							/* _CODE_H_ */