code.h

#ifndef code_h
#define code_h

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

/* accumulator */
#define  ac 0
#define  ac1 1
#define fp 2 // stack bottom
#define sp 3 // stack top
#define cp 4// const area
#define  mp 6// point to temp memory
#define gp 5 // global address

/* the float accumulator*/
#define fac 9
#define fac1 10

/* code emitting utilities */
/* Procedure emitComment prints a comment line
 * with comment c in the code file
 */

extern char labelTable[211][6];


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);

/*
    the section 8.4 talked about how to use lab to control code
    we can pass the label as the parameter in function gencode
    in addition, we need to store the lab in labeltabl, a struct to store relevant information,with it's instruction localtion
    when we execute the code, we need labeltable.
 */

void emitSYS(char *op, int r, int a, char * c);

// emit LDC code specifically
void emitLDCF(char * op, int r, float d, int s, char *c);

#endif /* code_h */