/****************************************************/
/* File: code.h */
/* Code emitting utilities for the TINY compiler */
/* and interface to the TM machine */
/* Compiler Construction: Principles and Practice */
/* Kenneth C. Louden */
/****************************************************/
#ifndef _CODE_H_
#define _CODE_H_
/* pc = program counter */
#define pc 7
/* mp = "memory pointer" points
* to top of memory (for temp storage)
*/
#define mp 6
/* gp = "global pointer" points
* to bottom of memory for (global)
* variable storage
*/
#define gp 5
/* accumulator */
#define ac 0
/* 2nd accumulator */
#define ac1 1
/* code emitting utilities */
/* Procedure emitComment prints a comment line
* with comment c in the code file
*/
void emitComment( char * c );
/* 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
* returns 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 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
