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c_ICG.y
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c_ICG.y
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%{
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <stdarg.h>
#include <ctype.h>
void yyerror(const char*);
int yylex();
int scope[100];
int scope_ctr;
int scope_ind;
int flag1 =1;
extern int yylineno;
int t=0;
int lab=0;
char stack[100][100];
int top=0;
int num_iter[10];
int iter_init[10];
int iter_top=0;
int number_of_iterations=0;
int return_flag=0;
typedef struct AST{
char lexeme[100];
int NumChild;
struct AST **child;
}AST_node;
char typ[10]="nothing";
extern FILE *yyin;
/*
struct attributes{
char* code;
struct attributes* true;
struct attributes* false;
struct attributes* next;
char addr[20];
}; */
char* code_gen(int arg_count,...);
char* gen_addr(char* string);
char* new_temp();
char* code_concatenate(int arg_count,...);
char* new_label();
int is_int(char *,int);
void remove_rest(char *, char *);
char break_lab[20];
char switch_id[10];
%}
%token DOT SINGLE SC COMMA LETTER OPBRACE CLBRACE CONTINUE BREAK IF ELSE FOR WHILE POW OPEN CLOSE COMMENT SQ_OPEN SQ_CLOSE
%union {char* var_type; char* text; struct AST *node; struct attributes{
char* code;
char* optimized_code;
char* true;
char* false;
char* next_lab;
char* next;
char* addr;
float val;
int is_dig;
}A;}
%token <var_type> INT FLOAT CHAR
%token <text> ID NUM PLUS MINUS MULT DIV AND OR LESS GREAT LESEQ GRTEQ NOTEQ EQEQ ASSIGN SPLUS SMINUS SMULT SDIV INC DEC SWITCH
%token <A> MAIN RETURN DEFAULT CASE COLON
%type <var_type> Type
%type <text> relOp logOp s_op
%type <A> F T E assign_expr1 assign_expr relexp logexp cond decl s_operation unary_expr iter_stat stat comp_stat start jump_stat select_stat ST C B D Varlist
%%
start:INT MAIN OPEN CLOSE comp_stat { //printf("Here\n");
$$=$5; print_sym_tab();
if(return_flag)
{ $$.code = code_concatenate(2,$$.code,"end: ");
$$.optimized_code = code_concatenate(2,$$.optimized_code,"end: ");
}
char* code1 = (char*)malloc(strlen($$.code));
char* code2 = (char*)malloc(strlen($$.optimized_code));
int a = remove_blank($$.code,code1);
a = remove_blank($$.optimized_code,code2);
printf("\n IC: \n%s",code1);
printf("\n OC: \n%s",code2);
char* code3 = (char*)malloc(strlen(code1));
char* code4 = (char*)malloc(strlen(code2));
remove_rest(code1,code3);
remove_rest(code2,code4);
//printf("\n IC: \n%s",$$.code);
//printf("\n IC: \n%s",code1);
//printf("\n OC: \n%s",code2);
//printf("\n\nOC: %s\n\n",$$.optimized_code);
printf("\n\nIC\n\n");
print_IC(code3);
printf("\n\nOC\n\n");
print_IC(code4);
YYACCEPT;
}
;
comp_stat: OPBRACE {scope_ctr++;scope[scope_ind++]=scope_ctr;} stat CLBRACE {$$=$3; scope[scope_ind++]=0; $$.optimized_code = $3.optimized_code;}
;
stat:E SC stat {$$.code = code_concatenate(2,$1.code,$3.code); $$.optimized_code = code_concatenate(2,$1.optimized_code, $3.optimized_code);}
| assign_expr stat {$$.code = code_concatenate(2,$1.code,$2.code);
//printf("$2 optimized code: %s\n\n", $2.optimized_code);
$$.optimized_code = code_concatenate(2,$1.optimized_code, $2.optimized_code);
$$.is_dig=$1.is_dig;
//printf("ABC\n");
}
|comp_stat stat {$$.code = code_concatenate(2,$1.code,$2.code); $$.optimized_code = code_concatenate(2,$1.optimized_code, $2.optimized_code);}
|{char * lab = new_label(); push(lab);} select_stat {pop();} stat {$$.code = code_concatenate(2,$2.code,$4.code);
$$.optimized_code = code_concatenate(2,$2.optimized_code, $4.optimized_code);
}
| {char * lab = new_label(); push(lab);} iter_stat {pop();} stat {$$.code = code_concatenate(2,$2.code,$4.code);
$$.optimized_code = code_concatenate(2,$2.optimized_code, $4.optimized_code);
}
| jump_stat stat {$$.code = code_concatenate(2,$1.code,$2.code); $$.optimized_code = code_concatenate(2,$1.optimized_code, $2.optimized_code);}
|decl stat {$$.code = code_concatenate(2,$1.code,$2.code); $$.optimized_code = code_concatenate(2,$1.optimized_code, $2.optimized_code);}
|%empty {$$.code = " "; $$.optimized_code = $$.code;}
;
ST : SWITCH OPEN ID CLOSE OPBRACE {scope_ctr++;scope[scope_ind++]=scope_ctr;} B CLBRACE
{
scope[scope_ind++]=0;
if(!look_up_sym_tab($3)){printf("Undeclared variable %s\n", $3); YYERROR;}
$$.code = code_concatenate(2, $7.code, code_gen(2,stack[top],": "));
$$.optimized_code = code_concatenate(2, $7.optimized_code, code_gen(2,stack[top],": "));
}
;
B : C {$$=$1;}
| C D {$$.code = code_concatenate(2,$1.code, $2.code); $$.optimized_code = code_concatenate(2,$1.optimized_code, $2.optimized_code);}
| C B {$$.code = code_concatenate(2,$1.code, $2.code); $$.optimized_code = code_concatenate(2,$1.optimized_code, $2.optimized_code);}
;
C : CASE NUM COLON stat {char* lab1 = new_label();
//printf("in switch\n");
char* lab2 = new_label();
//printf("in switch\n");
$$.code = code_concatenate(6,code_gen(4,"if ",$<text>-2," == ",$2," goto ", lab1), " goto ",lab2, code_gen(2,lab1,": "),$4.code, code_gen(2,lab2,": "));
//printf("in switch\n");
$$.optimized_code =code_concatenate(6,code_gen(6,"if ",$<text>-2," == ",$2," goto ", lab1), " goto ",lab2, code_gen(2, lab1,": "),$4.optimized_code, code_gen(2,lab2,": "));
//printf("%s\n",$4.optimized_code);
}
;
D : DEFAULT COLON stat {char* lab = new_label(); $$.code = code_concatenate(1,$3.code); $$.optimized_code = $3.optimized_code;}
;
select_stat: ST {$$=$1;}
;
iter_stat:FOR OPEN decl cond SC E CLOSE comp_stat {char* begin = new_label();
$3.next = begin;
$4.true = new_label();
$8.next = stack[top];
//push($8.next);
$4.false = $8.next;
//printf("here %s",break_lab);
strcpy(break_lab,$8.next);
//printf("here2 %s",break_lab);
//$8.next = new_label();
$6.next = begin;
$$.code = code_concatenate(8,$3.code, code_gen(2,begin,": "),code_gen(4,"if ", $4.code, "goto ", $4.true),
code_gen(2,"goto ", $4.false), code_gen(2,$4.true,": "),$8.code, code_gen(2,"goto ",begin),code_gen(2,$8.next,": \n"));
if(num_iter)
{
//printf("HERE\n");
$$.optimized_code = " ";
$$.optimized_code = code_concatenate(2,$$.optimized_code,$3.optimized_code);
//printf("number of iterations %d\n",number_of_iterations);
int i;
for(i=0;i<number_of_iterations;i++)
{
$$.optimized_code = code_concatenate(2,$$.optimized_code,$8.optimized_code);
}
//printf("FOR OC%s\n",$$.optimized_code);
}
else
{
$$.optimized_code = $$.code;
}
}
;
jump_stat: BREAK SC {$$.code = code_gen(2,"goto ",stack[top]); $$.optimized_code = $$.code;}
|RETURN E SC {$$.code = code_gen(3,"return ",$2.addr,"\ngoto end\n"); $$.optimized_code = $$.code; return_flag=1;}
;
cond:relexp {$$=$1;}
|logexp {$$=$1;}
|E {$$=$1;}
;
relexp:E relOp E {$$.code = code_gen(3,$1.code,$3.code,code_gen(3,$1.addr,$2,$3.addr));
if(strcmp($2,"<")==0)
{
num_iter[iter_top++]=atoi($3.addr);
//printf("TOP: %d\n",iter_top);
number_of_iterations = num_iter[--iter_top]-iter_init[iter_top];
//num_iter = atoi($3.addr);
//printf("Number of iterations: %d\n",num_iter);
}
if(strcmp($2,"<=")==0)
{
num_iter[iter_top++]=atoi($3.addr);
printf("TOP: %d\n",iter_top);
number_of_iterations = num_iter[--iter_top]-iter_init[iter_top]+1;
}
if(strcmp($2,">")==0)
{
num_iter[iter_top++]=atoi($3.addr);
printf("TOP: %d\n",iter_top);
number_of_iterations = iter_init[--iter_top] - num_iter[iter_top];
}
if(strcmp($2,">=")==0)
{
num_iter[iter_top++]=atoi($3.addr);
printf("TOP: %d\n",iter_top);
number_of_iterations = iter_init[--iter_top] - num_iter[iter_top]+1;
}
}
;
logexp:E logOp E {$$.code = code_gen(3,$1.code,$3.code,code_gen(3,$1.addr,$2,$3.addr)); $$.optimized_code = $$.code;}
;
logOp:AND {$$=$1;}
|OR {$$=$1;}
;
relOp:LESEQ {$$=$1;}
|GRTEQ {$$=$1;}
|NOTEQ {$$=$1;}
|EQEQ {$$=$1;}
|LESS {$$=$1;}
|GREAT {$$=$1;}
;
decl:Type Varlist SC {$$.code = code_gen(3,$1," ",$2.code); $$.optimized_code = $$.code;}
|Type assign_expr1 {$$.code = code_gen(1,$2.code); $$.optimized_code = $2.optimized_code; }
;
Type:INT { $$=$1; strcpy(typ,$1);}
|FLOAT {$$=$1;strcpy(typ,$1);}
;
Varlist:Varlist COMMA ID {if(look_up_sym_tab_dec($3,scope[scope_ind-1])){ yyerror("Redeclaration\n"); YYERROR; }
if(scope[scope_ind-1]>0){update_sym_tab($<var_type>0,$3,yylineno,scope[scope_ind-1]);}else{int scop=get_scope();update_sym_tab($<var_type>0,$3,yylineno,scop);}
$$.code = code_gen(3,$1.code,", ",$3); $$.optimized_code = code_gen(3,$1.optimized_code,", ",$3);
}
|ID {$$.addr=gen_addr($1);
if(look_up_sym_tab_dec($1,scope[scope_ind-1])){ yyerror("Redeclaration\n"); YYERROR; }
if(scope[scope_ind-1]>0){update_sym_tab($<var_type>0,$1,yylineno,scope[scope_ind-1]);}else{int scop=get_scope();update_sym_tab($<var_type>0,$1,yylineno,scop);}
$$.code = $1; $$.optimized_code = $1;
//printf("%s ID\n",$1);
}
;
assign_expr:ID ASSIGN E COMMA assign_expr {$$.addr = gen_addr($1);
$$.code = code_concatenate(3,$3.code,code_gen(3,$$.addr," = ",$3.addr),$5.code);
char buf[10];
int scop=get_scope();
int ret=is_int($1,scop);
if(ret)
{
if(is_digit($3.addr))
{
float val=atof($3.addr);
int val1=(int)val;
char buf1[10];
gcvt(val1, 6, buf1);
$$.code = code_concatenate(3,$3.code,code_gen(3,$$.addr," = ",buf1),$5.code);
}
else
$$.code = code_concatenate(3,$3.code,code_gen(3,$$.addr," = ",$3.addr),$5.code);
}
else
$$.code = code_concatenate(3,$3.code,code_gen(3,$$.addr," = ",$3.addr),$5.code);
//printf("%s\n",$1);
if(ret)
{
int val=(int)$3.val;
float f = val;
gcvt(val, 6, buf);
}
else
gcvt($3.val, 6, buf);
if($3.is_dig)
$$.optimized_code = code_concatenate(2,code_gen(3,$$.addr," = ",buf),$5.optimized_code);
else
$$.optimized_code = code_concatenate(3,$3.optimized_code,code_gen(3,$$.addr," = ",$3.addr),$5.optimized_code);
if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;}flag1=1;
}
|ID ASSIGN E SC {
$$.addr = gen_addr($1);
int scop=get_scope();
int ret=is_int($1,scop);
if(ret)
{
if(is_digit($3.addr))
{
float val=atof($3.addr);
int val1=(int)val;
char buf1[10];
gcvt(val1, 6, buf1);
$$.code = code_concatenate(2,$3.code,code_gen(3,$$.addr," = ",buf1));
}
else
$$.code = code_concatenate(2,$3.code,code_gen(3,$$.addr," = ",$3.addr));
}
else
$$.code = code_concatenate(2,$3.code,code_gen(3,$$.addr," = ",$3.addr));
char buf[10];
if(ret)
{
int val=(int)$3.val;
float f = val;
gcvt(val, 6, buf);
}
else
gcvt($3.val, 6, buf);
//printf("flag %d",flag1);
if($3.is_dig)
{
//printf("Assign Here\n");
$$.optimized_code = code_concatenate(1,code_gen(3,$$.addr," = ",buf));
//printf("%s\n",$$.optimized_code);
}
else
{
$$.optimized_code = code_concatenate(2,$3.optimized_code,code_gen(3,$$.addr," = ",$3.addr));
//flag1=1;
}
//printf("OC: %s\n",$$.optimized_code);
if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;}
flag1=1;
}
;
assign_expr1:ID ASSIGN E COMMA assign_expr1 {$$.addr = gen_addr($1);
if(strcmp(typ,"int")==0)
{
if(is_digit($3.addr))
{
float val=atof($3.addr);
int val1=(int)val;
char buf1[10];
gcvt(val1, 6, buf1);
$$.code = code_concatenate(3,$3.code,code_gen(5,typ," ",$$.addr," = ",buf1),$5.code);
}
else
$$.code = code_concatenate(3,$3.code,code_gen(5,typ," ",$$.addr," = ",$3.addr),$5.code);
}
else
$$.code = code_concatenate(3,$3.code,code_gen(5,typ," ",$$.addr," = ",$3.addr),$5.code);
char buf[10];
if(strcmp(typ,"int")==0)
{
int val=(int)$3.val;
float f = val;
gcvt(val, 6, buf);
}
else
gcvt($3.val, 6, buf);
if($3.is_dig)
$$.optimized_code = code_concatenate(2,code_gen(3,$$.addr," = ",buf),$5.optimized_code);
else
$$.optimized_code = code_concatenate(3,$3.optimized_code,code_gen(3,$$.addr," = ",$3.addr),$5.optimized_code);
//$$.optimized_code = code_concatenate(2,code_gen(5,typ," ",$$.addr," = ",buf),$5.optimized_code);
if(look_up_sym_tab_dec($1,scope[scope_ind-1])){ yyerror("Redeclaration\n"); YYERROR;flag1=1; }
if(scope[scope_ind-1]>0){update_sym_tab(typ,$1,yylineno,scope[scope_ind-1]);}else{int scop=get_scope();update_sym_tab(typ,$1,yylineno,scop);}
}
|ID ASSIGN E SC { $$.addr = gen_addr($1);
if(strcmp(typ,"int")==0)
{
if(is_digit($3.addr))
{
float val=atof($3.addr);
int val1=(int)val;
char buf1[10];
gcvt(val1, 6, buf1);
$$.code = code_concatenate(2,$3.code,code_gen(5,typ," ",$$.addr," = ",buf1));
}
else
$$.code = code_concatenate(2,$3.code,code_gen(5,typ," ",$$.addr," = ",$3.addr));
}
else
$$.code = code_concatenate(2,$3.code,code_gen(5,typ," ",$$.addr," = ",$3.addr));
char buf[10];
if(strcmp(typ,"int")==0)
{
int val=(int)$3.val;
float f = val;
gcvt(val, 6, buf);
}
else
gcvt($3.val, 6, buf);
if($3.is_dig)
{
//printf("Here\n");
$$.optimized_code = code_concatenate(1,code_gen(3,$$.addr," = ",buf));
}
else
{
$$.optimized_code = code_concatenate(2,$3.optimized_code,code_gen(3,$$.addr," = ",$3.addr));
//flag1=1;
}
//$$.optimized_code = code_concatenate(1,code_gen(5,typ," ",$$.addr," = ",buf));
//printf("OC: %s\n",$$.optimized_code);
if(look_up_sym_tab_dec($1,scope[scope_ind-1])){ yyerror("Redeclaration\n"); YYERROR; } if(scope[scope_ind-1]>0){update_sym_tab(typ,$1,yylineno,scope[scope_ind-1]);}else{int scop=get_scope();update_sym_tab(typ,$1,yylineno,scop);}
iter_init[iter_top]=atoi($3.addr);
//printf("TOP: %d",iter_top);flag1=1;
}
;
E:E PLUS T {$$.addr = new_temp(); $$.code = code_concatenate(3,$1.code,$3.code,code_gen(5,$$.addr," = ",$1.addr," + ",$3.addr));
if(($1.is_dig) && ($3.is_dig))
{
$$.is_dig=1;
//printf("HERE\n");
//printf("Constant folding\n");
//float temp = atof($1.addr) + atof($3.addr);
float temp = $1.val+$3.val;
char buf[10];
gcvt(temp, 6, buf);
$$.optimized_code = code_concatenate(3,$1.optimized_code,$3.optimized_code,code_gen(3,$$.addr," = ",buf));
//printf("%s\n",$$.optimized_code);
$$.val = temp;
flag1 &= 1;
}
else
{
$$.is_dig=0;
//printf("HERE\n");
$$.optimized_code = $$.code;
flag1=0;
}
}
|E MINUS T {$$.addr = new_temp(); $$.code = code_concatenate(3,$1.code,$3.code,code_gen(5,$$.addr," = ",$1.addr," - ",$3.addr));
if(($1.is_dig) && ($3.is_dig))
{
$$.is_dig=1;
//printf("Constant folding\n");
//float temp = atof($1.addr) - atof($3.addr);
float temp = $1.val-$3.val;
char buf[10];
gcvt(temp, 6, buf);
$$.optimized_code = code_concatenate(3,$1.optimized_code,$3.optimized_code,code_gen(3,$$.addr," = ",buf));
//printf("%s\n",$$.optimized_code);
$$.val = temp;
flag1 &=1;
}
else
{
$$.is_dig=0;
$$.optimized_code = $$.code;
flag1=0;
}
}
|T {$$=$1;}
;
T:T MULT F {$$.addr = new_temp(); $$.code = code_concatenate(3,$1.code,$3.code,code_gen(5,$$.addr," = ",$1.addr," * ",$3.addr));
if(($1.is_dig) && ($3.is_dig))
{
$$.is_dig=1;
//printf("HERE MULT\n");
//printf("Constant folding\n");
//float temp = atof($1.addr) * atof($3.addr);
float temp = $1.val*$3.val;
char buf[10];
gcvt(temp, 6, buf);
$$.optimized_code = code_concatenate(3,$1.optimized_code,$3.optimized_code,code_gen(3,$$.addr," = ",buf));
//printf("%s\n",$$.optimized_code);
$$.val = temp;
flag1 &=1;
}
else
{
$$.is_dig=0;
$$.optimized_code = $$.code;
flag1=0;
}
}
|T DIV F {$$.addr = new_temp(); $$.code = code_concatenate(3,$1.code,$3.code,code_gen(5,$$.addr," = ",$1.addr," / ",$3.addr));
if(($1.is_dig) && ($3.is_dig))
{
$$.is_dig=1;
//printf("Constant folding\n");
//float temp = atof($1.addr) / atof($3.addr);
float temp = $1.val/$3.val;
char buf[10];
gcvt(temp, 6, buf);
$$.optimized_code = code_concatenate(3,$1.optimized_code,$3.optimized_code,code_gen(3,$$.addr," = ",buf));
//printf("%s\n",$$.optimized_code);
$$.val = temp;
flag1 &=1;
}
else
{
$$.is_dig=0;
$$.optimized_code = $$.code;
flag1=0;
}
}
|F {$$.addr = $1.addr; $$.code = $1.code; $$.optimized_code = $1.optimized_code; $$.val = $1.val;$$.is_dig=$1.is_dig;}
;
F:ID {$$.addr = gen_addr($1); $$.code = code_gen(1," ");if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;} $$.optimized_code = $$.code;$$.is_dig=0;}
|NUM {$$.addr = gen_addr($1); $$.code = code_gen(1," ");$$.optimized_code = $$.code; $$.val = atof($1);$$.is_dig=1;}
|OPEN E CLOSE {$$= $2;}
|unary_expr {$$=$1;}
|s_operation {$$=$1;}
;
s_operation: ID s_op ID {$$.addr = new_temp();
$$.code = code_concatenate(2,code_gen(5,$$.addr,"=",$1,$2,$3), code_gen(3,$1,"=",$$.addr));
if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;}
if(!look_up_sym_tab($3)){printf("Undeclared variable %s\n", $3); YYERROR;}
$$.optimized_code = $$.code;
$$.is_dig=0;
}
| ID s_op NUM {$$.addr = new_temp();
$$.code = code_concatenate(2,code_gen(5,$$.addr,"=",$1,$2,$3), code_gen(3,$1,"=",$$.addr));
if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;}
$$.optimized_code = $$.code;
$$.is_dig=0;
}
| ID s_op OPEN E CLOSE {$$.addr = new_temp();
$$.code = code_concatenate(3,$4.code,code_gen(5,$$.addr,"=",$1,$2,$4.addr), code_gen(3,$1,"=",$$.addr));
if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;}
$$.optimized_code = $$.code;
$$.is_dig=0;
}
;
s_op:SPLUS {$$="+";}
|SMINUS {$$="-";}
|SMULT {$$="*";}
|SDIV {$$="/";}
;
unary_expr:INC ID { $$.addr = new_temp();
$$.code = code_concatenate(2,code_gen(4,$$.addr,"=",$2,"+ 1"),code_gen(3,$2,"=",$$.addr));
if(!look_up_sym_tab($2)){printf("Undeclared variable %s\n", $2); YYERROR;}
$$.optimized_code = $$.code;
$$.is_dig=0;
}
|ID INC { $$.addr = new_temp();
$$.code = code_concatenate(2,code_gen(4,$$.addr,"=",$1,"+ 1"),code_gen(3,$1,"=",$$.addr));
if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;}
$$.optimized_code = $$.code;
$$.is_dig=0;
}
|DEC ID { $$.addr = new_temp();
$$.code = code_concatenate(2,code_gen(4,$$.addr,"=",$2,"- 1"),code_gen(3,$2,"=",$$.addr));
if(!look_up_sym_tab($2)){printf("Undeclared variable %s\n", $2); YYERROR;}
$$.optimized_code = $$.code;
$$.is_dig=0;
}
|ID DEC { $$.addr = new_temp();
$$.code = code_concatenate(2,code_gen(4,$$.addr,"=",$1,"- 1"),code_gen(3,$1,"=",$$.addr));
if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;}
$$.optimized_code = $$.code;
$$.is_dig=0;
}
| MINUS ID { $$.addr = new_temp();
$$.code = code_gen(4,$$.addr,"=",$1,$2);
if(!look_up_sym_tab($1)){printf("Undeclared variable %s\n", $1); YYERROR;}
$$.optimized_code = $$.code;
$$.is_dig=0;
}
| MINUS NUM { $$.addr = new_temp();
$$.code = code_gen(4,$$.addr,"=",$1,$2);
$$.optimized_code = $$.code;
$$.is_dig=1;
}
;
%%
void yyerror(const char* arg)
{
printf("%s\n",arg);
}
struct entry
{
char name[30];
char type[10];
int width;
int line_num;
int scope;
};
struct entry sym_tab[100];
int ctr = 0;
void update_sym_tab(char* typ, char* nam, int line, int scope)
{
strcpy(sym_tab[ctr].name,nam);
if(strcmp(typ,"int")==0)
{
strcpy(sym_tab[ctr].type,typ);
sym_tab[ctr].width=4;
}
else if(strcmp(typ,"float")==0)
{
strcpy(sym_tab[ctr].type,typ);
sym_tab[ctr].width=8;
}
else if(strcmp(typ,"char")==0)
{
strcpy(sym_tab[ctr].type,typ);
sym_tab[ctr].width=1;
}
sym_tab[ctr].line_num=line;
sym_tab[ctr].scope=scope;
ctr++;
//printf("%d\n",ctr);
}
void print_sym_tab()
{
int i;
printf("\n\nSymbol Table: \n");
for(i=0;i<ctr;i++)
{
printf("<%s,%s,%d,%d, %d> \n",sym_tab[i].name, sym_tab[i].type, sym_tab[i].width,sym_tab[i].line_num,sym_tab[i].scope);
}
}
int look_up_sym_tab(char* nam)
{
int i;
for(i=0;i<ctr;i++)
{
if(strcmp(sym_tab[i].name,nam)==0)
{
int scop=sym_tab[i].scope;
int flag=0;
int zero_ctr=0;
int j=scope_ind-1;
while(j>=0)
{
if(scope[j]==0)
zero_ctr++;
else if(scope[j]!=0 && zero_ctr>0)
zero_ctr--;
else if(scope[j]!=0 && zero_ctr==0)
{
if(scope[j]==scop)
{
flag=1;
return 1;
}
}
j--;
}
}
}
return 0;
}
int is_int (char *nam, int scop)
{
int i;
for(i=0;i<ctr;i++)
{
if(strcmp(sym_tab[i].name,nam)==0 && scop==sym_tab[i].scope)
{
if(strcmp(sym_tab[i].type,"int")==0)
return 1;
else
return 0;
}
}
return 1;
}
int look_up_sym_tab_dec(char* nam, int scop)
{
int i;
for(i=0;i<ctr;i++)
{
if(strcmp(sym_tab[i].name,nam)==0 && sym_tab[i].scope==scop)
{
return 1;
}
}
return 0;
}
int get_scope()
{
//printf("ind :%d\n",scope_ind);
int i=scope_ind-1;
int zero_ctr=0;
int flag=1;
while(flag && i>0)
{
if(scope[i]!=0)
zero_ctr--;
else
zero_ctr++;
if(zero_ctr==0)
{
i--;
flag=0;
break;
}
i--;
}
return scope[i];
}
void push(char* string)
{
strcpy(stack[++top],string);
//printf("top: %s %d\n",stack[top],top);
}
void pop()
{
//printf("top: %d",top);
top--;
}
/*
struct entry sym_tab[100];
int ctr = 0;
void update_sym_tab(char* typ, char* nam)
{
strcpy(sym_tab[ctr].name,nam);
if(strcmp(typ,"int")==0)
{
strcpy(sym_tab[ctr].type,typ);
sym_tab[ctr].width=4;
}
else if(strcmp(typ,"float")==0)
{
strcpy(sym_tab[ctr].type,typ);
sym_tab[ctr].width=8;
}
else if(strcmp(typ,"char")==0)
{
strcpy(sym_tab[ctr].type,typ);
sym_tab[ctr].width=1;
}
ctr++;
//printf("%d\n",ctr);
}
*/
int remove_spaces(char* text, char* blank)
{
int p;
FILE *fp = fopen("temp.txt", "w");
if (fp != NULL)
{
fputs(text, fp);
fclose(fp);
}
//printf("Here\n");
fp=fopen("temp.txt","r");
FILE* fp2=fopen("newfile.txt","w"); //all the content gets copied to this filename and blank lines are also removed from your file
while((p=getc(fp))!=EOF)
{
//printf("Here2\n");
fputc(p,fp2);
if (p==10)
{
fputc(p,fp2);
while((p=getc(fp))==10)
{
printf("%c\n",p);
}
fputc(p,fp2);
}
}
printf("Here 3\n");
fclose(fp);
printf("Here 4\n");
fclose(fp2);
printf("Here 5\n");
fp=fopen("newfile.txt", "r");
printf("Here 6\n");
//struct stat buf;
//stat("speed",&buf);
//char *str = malloc(buf.st_size);
while(!feof(fp))
{
char *s=malloc(1024);
fgets(s,1024,fp);
s[strlen(s)-1]='\0';
strcat(blank,s);
}
printf("File content:%s\n",blank);
return 1;
}
int remove_blank(char *text, char* blank)
{
int c=0; int d=0;
while (text[c] != '\0') {
if (text[c] == ' ') {
int temp = c + 1;
if (text[temp] != '\0') {
while (text[temp] == ' ' && text[temp] != '\0') {
if (text[temp] == ' ') {
c++;
}
temp++;
}
}
}
blank[d] = text[c];
c++;
d++;
}
blank[d] = '\0';
//printf("Text after removing blanks\n%s\n", blank);
return 0;
}
void remove_rest(char *text, char* blank)
{
char *tok=strtok(text,"\n");
while(tok!=NULL)
{
if(strlen(tok)>1)
{
/*
if(strcmp(tok[0],"L")==0)
{
strcat(blank,tok);
strcat(blank," ");
tok=strtok(NULL,"\n");
strcat(blank,tok);
strcat(blank,"\n");
}
*/
if(strcmp(tok," goto ")==0)
{
strcat(blank,"goto");
strcat(blank," ");
tok=strtok(NULL,"\n");
strcat(blank,tok);
strcat(blank,"\n");
}
//char tmp[100];
//strcpy(tmp,tok);
/*
if(tmp[0]=='L')
{
strcat(blank,tok);
strcat(blank," ");
tok=strtok(NULL,"\n");
char temp1[10];
strcpy(temp1,tok);
if(temp1[0]!='L')
{
strcat(blank,tok);
strcat(blank,"\n");
}
else
{
strcat(blank,"\n");
strcat(blank,tok);
strcat(blank,"\n");
}
}*/
else
{
strcat(blank,tok);
strcat(blank,"\n");
}
}
tok=strtok(NULL,"\n");
}
/*
char *temp=malloc(strlen(blank));
strcpy(temp,blank);
printf("-----------------------------------\n");
printf("%s\n",temp);
printf("-----------------------------------\n");
strcpy(blank,"");
char *tok1=strtok(temp,"\n");
while(tok1!=NULL)
{
char tmp[100];
strcpy(tmp,tok1);
if(tmp[0]=='L')
{
strcat(blank,tok1);
//strcat(blank," ");
tok1=strtok(NULL,"\n");
//strcat(blank,tok1);
if(strcmp(tok1,": ")==0)
{
strcat(blank,tok1);
//tok1=strtok(NULL,"\n");
//strcat(blank," ");
//strcat(blank,tok1);
}
strcat(blank,"\n");
}
else
{
//strcat(blank,tok1);
//strcat(blank,"\n");
strcat(blank,tok1);
strcat(blank,"\n");
}
tok1=strtok(NULL,"\n");
}
*/
}
int is_digit(char* tmp)
{
int j=0;
int isDigit = 1;
while(j<strlen(tmp))
{
if(isdigit(tmp[j])|| tmp[j]=='.')
{
j++;
continue;
}
else
{