code.c

来自「C语言高级编程及实例部析 by Johnzhang0921」· C语言 代码 · 共 62 行

#include "globals.h"
#include "code.h"


static int emitLoc = 0 ;

static int highEmitLoc = 0;


void emitComment( char * c )
{ if (TraceCode) fprintf(code,"* %s\n",c);}


void emitRO( char *op, int r, int s, int t, char *c)
{ fprintf(code,"%3d:  %5s  %d,%d,%d ",emitLoc++,op,r,s,t);
  if (TraceCode) fprintf(code,"\t%s",c) ;
  fprintf(code,"\n") ;
  if (highEmitLoc < emitLoc) highEmitLoc = emitLoc ;
} 


void emitRM( char * op, int r, int d, int s, char *c)
{ fprintf(code,"%3d:  %5s  %d,%d(%d) ",emitLoc++,op,r,d,s);
  if (TraceCode) fprintf(code,"\t%s",c) ;
  fprintf(code,"\n") ;
  if (highEmitLoc < emitLoc)  highEmitLoc = emitLoc ;
} 

int emitSkip( int howMany)
{  int i = emitLoc;
   emitLoc += howMany ;
   if (highEmitLoc < emitLoc)  highEmitLoc = emitLoc ;
   return i;
} 

void emitBackup( int loc)
{ if (loc > highEmitLoc) emitComment("BUG in emitBackup");
  emitLoc = loc ;
} 


void emitRestore(void)
{ emitLoc = highEmitLoc;}


void emitRM_Abs( char *op, int r, int a, char * c)
{ fprintf(code,"%3d:  %5s  %d,%d(%d) ",
               emitLoc,op,r,a-(emitLoc+1),pc);
  ++emitLoc ;
  if (TraceCode) fprintf(code,"\t%s",c) ;
  fprintf(code,"\n") ;
  if (highEmitLoc < emitLoc) highEmitLoc = emitLoc ;
}