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first_pass.c
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first_pass.c
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#include "assembler.h"
/* Macros for common errors: */
#define MISSING_COMMA(ch) \
if (ch != ',') {\
fprintf(stderr,"Line %d: missing comma\n",*current_line);\
*error_flag=1;\
break;\
}
#define MULTIPLE_CONSECUTIVE_COMMAS(ch) \
if (ch == ',') {\
fprintf(stderr,"Line %d: Multiple consecutive commas\n",*current_line);\
*error_flag=1;\
break;\
}
#define MISSING_DOLLAR(ch) \
if (ch != '$') {\
fprintf(stderr,"Line %d: missing '$'\n",*current_line);\
*error_flag=1;\
break;\
}
#define MISSING_PARAMETER(ch) \
if (!ch) {\
fprintf(stderr,"Line %d: missing parameter\n",*current_line);\
*error_flag=1;\
break;\
}
#define EXTRANEOUS_TEXT(ch) \
if (ch) {\
fprintf(stderr,"Line %d: extraneous text after end of command\n",*current_line);\
*error_flag=1;\
break;\
}
#define IS_DIGIT(ch) \
if (!isdigit(ch)) {\
fprintf(stderr,"Line %d: not a digit\n",*current_line);\
*error_flag=1;\
break;\
}
#define IS_CHAR(ch) \
if (!isalpha(ch)) {\
fprintf(stderr,"Line %d: not a char\n",*current_line);\
*error_flag=1;\
break;\
}
#define PROPER_REGISTER(ch) \
if (ch<0 || ch>32) {\
fprintf(stderr,"Line %d: register is not in the range 0-32\n",*current_line);\
*error_flag=1;\
break;\
}
/*
* first_pass: this function receive 5 parameters and return nothing
* the first parameter is an array of the line given by the input file
* the second parameter (named head) is pointer to the symbols list
* the third parameter is int pointer to Instruction Counter, its increas each time a word is added to words_array
* the fourth parameter is int pointer to Data Counter, its increas each time a word is added to DC_array
* the fifth parameter is int pointer error_flag, its change to 1 if the program found an error
* this function represent the first pass to initialize all the encode words in words_array
* if this function found an error then there will not be a call to the second pass
*/
void first_pass(char line[],symbol_pointer *head,int *IC, int *DC,int *error_flag, int *current_line)
{
int i; /* counter, and symbolize the command */
int j=0; /* counter */
char *p; /* pointer for the line */
char label[SIZE_OF_LINE]; /* char array that saves the label name */
int state; /* int that saves what case to jump*/
int labelFlag = 0; /*flag that saves if we have label or not */
long val; /* for atol */
p = line;
p = skipSpacesAndTabs(p); /* if there are spaces or tabs at the beginning we ignore them */
if (p[0] == '\n') { /* check if the line is only with spaces */
(*current_line)++;
return;
}
if (p[0] == ';') { /* check if the line note */
(*current_line)++;
return;
}
/* ********************************** */
/* stage 1: check if there is a label */
while(p[j]!='\n')
{
if(p[j]==' ')
break;
if (p[j]==':')
{
labelFlag = 1;
break;
}
j++;
}
if (labelFlag)
{ /*check if the label is terminated correcly. */
if (j>MAX_SIZE_LABEL)
{
fprintf(stderr,"Line %d: label is too long\n",*current_line);
(*current_line)++;
*error_flag=1;
return;
}
for(i=0;i<j;i++)
{
if(!isalpha(p[i]))
{
fprintf(stderr,"Line %d: char '%c' is not valid\n",*current_line,p[i]);
(*current_line)++;
*error_flag=1;
return;
}
}
memset(label, '\0', sizeof(label));
strncpy(label,p,j); /*copy the label name to to char "label" */
p+=j+1; /* skip label name */
}
for(i=0;i<NUM_FUNC;i++) /* check if the label is named after command label names */
{
if(!strcmp(label,commandNames[i]))
{
fprintf(stderr,"Line %d: the label '%s' conflicts with an existing label name\n",*current_line,label);
(*current_line)++;
*error_flag=1;
return;
}
}
/* ********************************** */
/* stage 2: check if the command is extern or data or asciz */
p = skipSpacesAndTabs(p); /* if there are spaces or tabs at the beginning we ignore them */
if(p[0]=='\n')/* check if it is a blank line */
{
fprintf(stderr,"Line %d: missing command\n",*current_line);
(*current_line)++;
*error_flag=1;
return;
}
i = firstWord(p);
if (i==-1) { /* check if the command exist */
fprintf(stderr,"Line %d: undefined command name\n",*current_line);
(*current_line)++;
*error_flag=1;
return;
}
if(labelFlag)
{
if(i>=27 && i<=30)
add_symbol(head,label,IC,DC,DATA,error_flag,current_line); /* adds the symbol to the symbol list as data type */
else
add_symbol(head,label,IC,DC,CODE,error_flag,current_line); /* adds the symbol to the symbol list as instruction type */
}
p += strlen(commandNames[i]); /* We no longer need the command name */
if(i!=30) /* in case of asciz we need backspaces */
removeSpaces(p); /* In other cases we do not need spaces */
/* ********************************** */
/* stage 3: classify the command name ( not data or asciz) */
if (i<=4)
state=1;
else if (i<=7)
state=2;
else if (i<=12)
state=3;
else if(i<=16)
state=4;
else if(i<=22)
state=5;
else if(i<26)
state=6;
else if (i==26)
state=7;
else if(i>=27 && i<=29)
state=8;
else if(i==30)
state=9;
else if(i==31)
state=10;
else if(i==32)
state=11;
switch(state)
{
case 1: /* case add, sub, and, or ,nor*/
MISSING_PARAMETER(p[0])
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[2]))
p++;
MISSING_COMMA(p[2]);
MULTIPLE_CONSECUTIVE_COMMAS(p[3]);
p+=3;
MISSING_DOLLAR(p[0])
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[2]))
p++;
MISSING_COMMA(p[2]);
MULTIPLE_CONSECUTIVE_COMMAS(p[3])
p+=3;
MISSING_DOLLAR(p[0])
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[2]))
p++;
EXTRANEOUS_TEXT(p[2])
break;
case 2: /* case move, mvhi, mvlo*/
MISSING_PARAMETER(p[0])
MISSING_DOLLAR(p[0])
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[2])){
p++;
}
MISSING_COMMA(p[2]);
MULTIPLE_CONSECUTIVE_COMMAS(p[3]);
p+=3;
MISSING_DOLLAR(p[0])
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[2]))
p++;
EXTRANEOUS_TEXT(p[2])
break;
case 3: /* case addi,subi,andi,ori,nori*/
MISSING_PARAMETER(p[0])
MISSING_DOLLAR(p[0])
if((p[0] =='-')||(p[0] =='+'))
p++;
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if(isdigit(p[2]))
p++;
MISSING_COMMA(p[2]);
MULTIPLE_CONSECUTIVE_COMMAS(p[3]);
p+=3;
if((p[0] =='-')||(p[0] =='+'))
p++;
IS_DIGIT(p[0])
while(isdigit(p[0]))
p++;
MISSING_COMMA(p[0]);
MULTIPLE_CONSECUTIVE_COMMAS(p[1]);
MISSING_DOLLAR(p[1])
IS_DIGIT(p[2])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[3]))
p++;
EXTRANEOUS_TEXT(p[3])
break;
case 4: /* case beq, bne, blt, bgt*/
MISSING_PARAMETER(p[0])
MISSING_DOLLAR(p[0])
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[2]))
p++;
MISSING_COMMA(p[2]);
MULTIPLE_CONSECUTIVE_COMMAS(p[3]);
p+=3;
MISSING_DOLLAR(p[0])
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[2]))
p++;
MISSING_COMMA(p[2]);
MULTIPLE_CONSECUTIVE_COMMAS(p[3]);
p+=3;
IS_CHAR(p[0]);
while (isalpha(p[0]))
p++;
EXTRANEOUS_TEXT(p[0])
break;
case 5: /* case lb,sb,lw,sw,lh,sh*/
MISSING_PARAMETER(p[0])
MISSING_DOLLAR(p[0])
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if (isdigit(p[2]))
p++;
MISSING_COMMA(p[2]);
MULTIPLE_CONSECUTIVE_COMMAS(p[3]);
p+=3;
if(p[0] =='-'||p[0] =='+'){
IS_DIGIT(p[1])
val=atol(p);
p++;
}
else
{
IS_DIGIT(p[0])
val=atol(p);
}
if (val<MIN_SIZE_16_BITS || val>MAX_SIZE_16_BITS){
fprintf(stderr,"Error in line %d, number is not in the range \n",*current_line);
*error_flag=1;
break;
}
while(isdigit(p[0]))
p++;
MISSING_COMMA(p[0]);
MULTIPLE_CONSECUTIVE_COMMAS(p[1]);
MISSING_DOLLAR(p[1])
IS_DIGIT(p[2])
val = atoi(p+2);
PROPER_REGISTER(val);
if (isdigit(p[3]))
p++;
EXTRANEOUS_TEXT(p[3])
break;
case 6: /* case jmp ,la ,call */
MISSING_PARAMETER(p[0])
if (p[0]=='$') /* it's a register */
{
IS_DIGIT(p[1])
val = atoi(p+1);
PROPER_REGISTER(val);
if(isdigit(p[2]))
p++;
EXTRANEOUS_TEXT(p[2])
}
else
{
while(p[0]!='\0') /* checks if the label terminated correctly */
{
if(!isdigit(p[0])&&!isalpha(p[0]))
{
fprintf(stderr,"Error in line %d, label not terminated correctly \n",*current_line);
*error_flag=1;
break;
}
p++;
}
}
break;
case 7: /* case stop */
EXTRANEOUS_TEXT(p[0])
break;
case 8: /* case data */
if(p[0]=='\0') /* checks if missing data */
{
fprintf(stderr,"Line %d: no data was given\n",*current_line);
*error_flag=1;
break;
}
while(1)
{
if((p[0] =='-')||(p[0] =='+'))
{
IS_DIGIT(p[1])
val = atol(p);
p++;
}
else
{
IS_DIGIT(p[0])
val = atol(p);
}
if(i==27) /* .db */
{
if(val<MIN_SIZE_8_BITS || val > MAX_SIZE_8_BITS)
{
fprintf(stderr,"Line %d: given number is out of range\n",*current_line);
*error_flag=1;
break;
}
(*DC)++;
}
if(i==29) /* .dh */
{
if(val<MIN_SIZE_16_BITS || val > MAX_SIZE_16_BITS)
{
fprintf(stderr,"Line %d: given number is out of range\n",*current_line);
*error_flag=1;
break;
}
(*DC)+=2;
}
if(i==28) /* dw */
{
if(val<MIN_SIZE_32_BITS || val > MAX_SIZE_32_BITS)
{
fprintf(stderr,"Line %d: given number is out of range\n",*current_line);
*error_flag=1;
break;
}
(*DC)+=4;
}
while(isdigit(p[0]))
p++;
if(p[0]=='\0')
break;
MISSING_COMMA(p[0]);
MULTIPLE_CONSECUTIVE_COMMAS(p[1]);
p++;
}
break;
case 9: /* case .asciz */
p = skipSpacesAndTabs(p);
if(p[0]!='"'){
fprintf(stderr,"Line %d: command .asciz not teminated correctly\n",*current_line);
*error_flag=1;
break;
}
p++;
while(p[0]!='"'){
if (!isalpha(p[0])&&p[0]!=' ') /*|| p[0]!=' ')*/
{
fprintf(stderr,"Line %d: command .asciz not teminated correctly\n",*current_line);
*error_flag=1;
(*current_line)++;
return;
}
(*DC)++;
p++;
}
(*DC)++;
p++;
removeSpaces(p);
EXTRANEOUS_TEXT(p[0])
break;
case 10: /* case .entry */
fprintf(stderr,".entry warrning\n");
MISSING_PARAMETER(p[0])
memset(label, '\0', sizeof(label));
strncpy(label,p,strlen(p));
add_symbol(head,label,IC,DC,ENTRY,error_flag,current_line);
p+=sizeof(label);
EXTRANEOUS_TEXT(p[0])
break;
case 11: /* case .external */
fprintf(stderr,".external warrning\n");
MISSING_PARAMETER(p[0])
memset(label, '\0', sizeof(label));
strncpy(label,p,strlen(p));
add_symbol(head,label,IC,DC,EXTERNAL,error_flag,current_line);
p+=sizeof(label);
EXTRANEOUS_TEXT(p[0])
break;
} /* end of cases */
(*current_line)++;
if(i<=26)
(*IC)+=4;
return;
}