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s6.y
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s6.y
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%{
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int yylex(void);
void yyerror(char *);
struct Lsymbol
{
char *name;
int type; //integer-0, 1-boolean
int bind;
struct Lsymbol *next;
};
struct Gsymbol
{
char *name;
int type; //integer-0, 1-boolean
int size;
int *bind;
//struct ArgStruct *arglist;
struct Gsymbol *next;
};
struct tree
{
char *name;
int nval;
char nop;
char type[20];
int sttype;
struct tree *left;
struct tree *right;
struct tree *middle;
struct Gsymbol *Gentry;
struct Lsymbol *Lentry;
};
struct values
{
int type;
int value;
}ret;
int sym[26]={0};
void displayinorder(struct tree*);
struct values evaluation (struct tree*);
void neweval(struct tree*);
struct tree *dummyalloc();
int is_left(struct tree*);
int is_right(struct tree*);
int is_dummy(struct tree*);
void printGivenLevel(struct tree* root, int level);
int height(struct tree* node);
void printLevelOrder(struct tree* hi);
void display(struct tree *node);
void sv(struct tree *node);
int state=1;
extern FILE *yyin;
void checkexists(char *str);
void checkb(struct tree *node);
void checki(struct tree *node);
struct Gsymbol * Glookup(char * NAME);
void Ginstall(char* NAME,int TYPE,int SIZE);
void display_s_table();
struct Gsymbol *lookup(char* name);
struct Gsymbol *Gtable=NULL;
int k=-1;
%}
%token VAL ';' ID READ WRITE IF ELSE EQ LT GT LTE GTE THEN ENDIF END DO ENDWHILE WHILE INT BOOL FALSE TRUE AND NOT OR DECLS DECLE BEGINP
%type<node> expr VAL '+' '*' '=' '-' '/' '%' ID Stmt IF READ WRITE EQ LT GT LTE GTE Slist WHILE FALSE TRUE AND NOT OR
%nonassoc '='
%left OR
%left AND
%left GT LT GTE LTE EQ
%left '+' '-'
%left '*' '/' '%'
%left NOT
%union
{
struct tree *node;
}
%%
Program: DECLS Decllist DECLE BEGINP Slist {//printf("test");
}
;
Decllist: Decllist Decl
|
;
Decl: Type IDlist ';'
;
Type: INT {k=0;}
|BOOL {k=1;}
;
IDlist: IDlist ',' ID { // printf("hello");
checkexists($3->name);
Ginstall($3->name,k,1);
//$$=dummyalloc();
//printf("symbol table\n");
//display_s_table();
}
| ID {
checkexists($1->name);
Ginstall($1->name,k,1);
//$$=dummyalloc();
//printf("symbol table\n");
//display_s_table();
}
| ID '[' VAL ']' { checkexists($1->name);
Ginstall($1->name,k,$3->nval);
//display_s_table();
}
;
Slist: Slist Stmt {$$=dummyalloc();
$$->left=$1;
$$->right=$2;
}
|Slist END {$$=NULL;
//root=treemod(root);
//printLevelOrder(root);
//displayinorder(root);
//sv($1);
printf("\n");
neweval($1);
exit(0);
}
| {$$=NULL;
}
;
Stmt: IF '(' expr ')' THEN Slist ENDIF {
checkb($3);
$$=$1;
$$->left=$3;
$$->right=$6;
$$->sttype=0;
}
| IF '(' expr ')' THEN Slist ELSE Slist ENDIF {
checkb($3);
$$=$1;
$$->left=$3;
$$->right=$6;
$$->middle=$8;
$$->sttype=0;
}
| WHILE '(' expr ')' DO Slist ENDWHILE { checkb($3);
$$=$1;
$$->left=$3;
$$->right=$6;
$$->sttype=0;
}
|ID '=' expr ';' {
struct Gsymbol *gtemp;
gtemp=lookup($1->name);
if(gtemp==NULL)
{
printf("Identifier %s not declared",$1->name);
exit(1);
}
else
{
if(gtemp->type==1)
checkb($3);
else
checki($3);
}
$$=$2;
$$->left=$1;
$$->right=$3;
$1->middle=NULL;
$$->sttype=0;
}
|ID '[' expr ']' '=' expr ';' { struct Gsymbol *gtemp;
gtemp=lookup($1->name);
if(gtemp==NULL)
{
printf("Identifier %s not declared",$1->name);
exit(1);
}
else
{
if(gtemp->type==1)
checkb($6);
else
checki($6);
}
checki($3);
$$=$5;
$1->middle=$3;
$$->left=$1;
$$->right=$6;
$$->sttype=0;
}
|READ '(' ID ')'';' { struct Gsymbol *gtemp;
gtemp=lookup($3->name);
if(gtemp==NULL)
{
printf("Identifier %s not declared",$3->name);
exit(1);
}
else
{
if(gtemp->type==1)
{printf("IO operations not");
printf(" allowed on Boolean variables");
exit(1);}
}
$$=$1;
$$->right=$3;
$3->middle=NULL;
$$->sttype=0;
}
|READ '(' ID '[' expr ']' ')'';' { struct Gsymbol *gtemp;
gtemp=lookup($3->name);
if(gtemp==NULL)
{
printf("Identifier %s not declared",$3->name);
exit(1);
}
else
{
if(gtemp->type==1)
{printf("IO operations not");
printf(" allowed on Boolean variables");
exit(1);}
}
checki($5);
$$=$1;
$$->right=$3;
$3->middle=$5;
$$->sttype=0;
//printf(" ANSS!!!! %d",$$->nval);
}
|WRITE '(' expr ')'';' {
checki($3);
$$=$1;
$$->left=$3;
$$->sttype=0;
}
;
expr: ID { struct Gsymbol *gtemp;
gtemp=lookup($1->name);
if(gtemp==NULL)
{
printf("Identifier %s not declared",$1->name);
exit(1);
}
$$=$1;$$->middle=NULL;
if(gtemp->type==1)
$$->sttype=1;
else
$$->sttype=2;
}
|ID '[' expr ']' {
struct Gsymbol *gtemp;
gtemp=lookup($1->name);
if(gtemp==NULL)
{
printf("Identifier %s not declared",$1->name);
exit(1);
}
checki($3);
$$=$1; $$->middle=$3;
if(gtemp->type==1)
$$->sttype=1;
else
$$->sttype=2;
}
| expr '+' expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=2;}
| expr '-' expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=2;}
| expr '*' expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=2;}
| expr '/' expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=2;}
| expr '%' expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=2;}
| '(' expr ')' {$$=$2;}
|VAL {$$=$1;$$->sttype=2;}
|expr EQ expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=1;}
|expr LT expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=1;}
|expr GT expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=1;}
|expr LTE expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=1;}
|expr GTE expr {checki($1);checki($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=1;}
|expr AND expr {checkb($1);checkb($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=1;}
|expr OR expr {checkb($1);checkb($3);$$=$2;$$->left=$1;$$->right=$3;$$->sttype=1;}
|NOT expr {checkb($2);$$=$1;$$->left=$2;$$->sttype=1;}
|TRUE {$$=$1;$$->sttype=1;}
|FALSE {$$=$1;$$->sttype=1;}
;
%%
void yyerror(char *s) {
fprintf(stderr, "%s\n", s);
}
void checkb(struct tree *node)
{
if(node->sttype==2)
{
printf("Type mismatch ,boolean expected ,integer given");
exit(1);
}
else if(node->sttype==0)
{
printf("Type mismatch ,boolean expected ,void given");
exit(1);
}
}
void checki(struct tree *node)
{
if(node->sttype==1)
{
printf("Type mismatch ,integer expected ,boolean given");
exit(1);
}
else if(node->sttype==0)
{
printf("Type mismatch ,integer expected ,void given");
exit(1);
}
}
void checkexists(char *str)
{
struct Gsymbol *gtemp;
gtemp=lookup(str);
if(gtemp!=NULL)
{ printf("Identifier with name %s exists",str);
exit(0);
}
}
void display(struct tree *node)
{
if(node!=NULL)
printf("name%s val%d nop%c type%s \t",node->name,node->nval,node->nop,node->type);
}
int height(struct tree* node)
{
if (node==NULL)
return 0;
else
{
/* compute the height of each subtree */
int lheight = height(node->left);
int rheight = height(node->right);
/* use the larger one */
if (lheight > rheight)
return(lheight+1);
else return(rheight+1);
}
}
void printGivenLevel(struct tree* hi, int level)
{
if(hi == NULL)
return;
if(level == 1)
display(hi);
else if (level > 1)
{
printGivenLevel(hi->left, level-1);
printGivenLevel(hi->right, level-1);
}
}
void printLevelOrder(struct tree* hi)
{
int h = height(hi);
int i;
for(i=1; i<=h; i++)
{ printGivenLevel(hi, i);
printf("\n");
}
}
void sv(struct tree *node)
{
if (node!=NULL)
{
printf("node");display(node);
if(node->left!=NULL)
{printf("leftchild");display(node->left);}
if(node->right!=NULL)
{printf("rightchild");display(node->right);}
if(node->left!=NULL)
{sv(node->left);
printf("\n");
}
else
{printf("emptyleeftchild ");
printf("\n");
}
if(node->right!=NULL)
{sv(node->right);
printf("\n");
}
else
{printf("emptyrighttchild ");
printf("\n");
}
}
}
void displayinorder(struct tree *root)
{
if (root!=NULL)
{
displayinorder(root->left);
if (root->nval !=-1)
printf("%d ",root->nval);
else if (root->nop !='\0')
printf("%c ",root->nop);
else if(!strcmp(root->type,"dummy"))
printf("dummy ");
else if(!strcmp(root->type,"if"))
{printf("if ");displayinorder(root->middle);}
else if(!strcmp(root->type,"=="))
printf("== ");
else if(!strcmp(root->type,"<="))
printf("<= ");
else if(!strcmp(root->type,">="))
printf(">= ");
else if(!strcmp(root->type,"<"))
printf("< ");
else if(!strcmp(root->type,">"))
printf("> ");
else if(!strcmp(root->type,"variable"))
printf("%s",root->name);
else if(!strcmp(root->type,"read"))
printf("read");
else if(!strcmp(root->type,"write"))
printf("write");
displayinorder(root->right);
}
}
struct values evaluation(struct tree *hi)
{if(hi!=NULL)
{
if(strcmp(hi->type,"dummy")==0)
{
neweval(hi);
}
else if(hi->nop=='=')
{
struct Gsymbol *addr=lookup((hi->left)->name);
if(addr!=NULL)
{
int *p=addr->bind;
if((hi->left)->middle==NULL)
{
// printf("nval=-1 %s ",hi->left->name);
*p=evaluation(hi->right).value;
//display_s_table();
//printf("in = %d",*p);
}
else
{
int ans=evaluation((hi->left)->middle).value;
//printf("nval=%d %s ",hi->left->nval,hi->left->name);
*(p+ans)=evaluation(hi->right).value;
}
//display_s_table();
//return evaluation(hi->right);
//sv(hi);
}
}
else if(strcmp(hi->type,"boolean")==0)
{
struct values ptr;
ptr.type=1;
ptr.value=hi->nval;
return ptr;
}
else if(strcmp(hi->type,"variable")==0)
{
struct Gsymbol *addr=lookup(hi->name);
if(addr!=NULL)
{
int *p=addr->bind;
struct values ptr;
ptr.type=(addr->type);
if (hi->middle == NULL)
{
// printf("in var %d",*p);
ptr.value=*p;
return ptr;
}
else
{
int ans=evaluation(hi->middle).value;
//printf("in var %d",*(p+(hi->nval)));
ptr.value=*(p+ans);
return ptr;
}
}
}
else if(strcmp(hi->type,"digit")==0)
{
struct values ptr;
ptr.type=0;
ptr.value=hi->nval;
return ptr;
}
else if(hi->nop=='+')
{ struct values a,b,ptr;
a=evaluation(hi->left);
b=evaluation(hi->right);
if (a.type==0 && b.type==0)
{
ptr.value=evaluation(hi->left).value + evaluation(hi->right).value;
ptr.type=0;
return ptr;
}
else
{printf("TYPE MISMATCH");}
}
else if(hi->nop=='-')
{ struct values a,b,ptr;
a=evaluation(hi->left);
b=evaluation(hi->right);
if (a.type==0 && b.type==0)
{
ptr.value=evaluation(hi->left).value - evaluation(hi->right).value;
ptr.type=0;
return ptr;
}
else
{printf("TYPE MISMATCH");}
}
else if(hi->nop=='/')
{ struct values a,b,ptr;
a=evaluation(hi->left);
b=evaluation(hi->right);
if (a.type==0 && b.type==0)
{
ptr.value=evaluation(hi->left).value / evaluation(hi->right).value;
ptr.type=0;
return ptr;
}
else
{printf("TYPE MISMATCH");}
}
else if(hi->nop=='%')
{ struct values a,b,ptr;
a=evaluation(hi->left);
b=evaluation(hi->right);
if (a.type==0 && b.type==0)
{
ptr.value=evaluation(hi->left).value % evaluation(hi->right).value;
ptr.type=0;
return ptr;
}
else
{printf("TYPE MISMATCH");}
}
else if (hi->nop=='*')
{ struct values a,b,ptr;
a=evaluation(hi->left);
b=evaluation(hi->right);
if (a.type==0 && b.type==0)
{
ptr.value=evaluation(hi->left).value * evaluation(hi->right).value;
ptr.type=0;
return ptr;
}
else
{printf("TYPE MISMATCH");exit(0);}
}
else if(strcmp(hi->type,"read")==0)
{
struct Gsymbol *addr=lookup(hi->right->name);
if(addr!=NULL)
{
int *p=addr->bind;
if (addr->type==0)
{
if (hi->right->middle==NULL)
scanf("%d",p);
else
{int ans=evaluation(hi->right->middle).value;
scanf("%d",p+ans);
}
}
else
{
printf("TYPE MISMATCH");
exit(0);
}
}
}
else if(strcmp(hi->type,"write")==0)
{
struct values a=evaluation(hi->left);
if (a.type==0)
{
printf("%d ",a.value);
}
else
{
printf("TYPE MISMATCH");
exit(0);
}
}
else if(strcmp(hi->type,"if")==0)
{
if(evaluation(hi->left).value==1 && evaluation(hi->left).type==1)
{
evaluation(hi->right);
}
else if(hi->middle!=NULL)
evaluation(hi->middle);
}
else if(strcmp(hi->type,"while")==0)
{
//sv(hi->right);
while(evaluation(hi->left).value==1 && evaluation(hi->left).type==1)
{
//display_s_table();
evaluation(hi->right);
}
}
else if((strcmp(hi->type,"not")==0))
{
struct values a=evaluation(hi->left);
struct values p;
p.type=1;
if(a.value==0)
p.value=1;
else
p.value=0;
return p;
}
else
{
struct values a=evaluation(hi->left);
struct values b=evaluation(hi->right);
if(strcmp(hi->type,"or")==0)
{struct values p;
p.type=1;
if(a.value || b.value)
p.value=1;
else
p.value=0;
return p;
}
else if(strcmp(hi->type,"and")==0)
{struct values p;
p.type=1;
if(a.value && b.value)
p.value=1;
else
p.value=0;
return p;
}
else if(strcmp(hi->type,"==")==0)
{struct values p;
p.type=1;
if(a.value==b.value)
p.value=1;
else
p.value=0;
return p;
}
else if(strcmp(hi->type,"<")==0)
{struct values p;
p.type=1;
if(a.value<b.value)
p.value=1;
else
p.value=0;
return p;
}
else if(strcmp(hi->type,"<=")==0)
{struct values p;
p.type=1;
if(a.value<=b.value)
p.value=1;
else
p.value=0;
return p;
}
else if(strcmp(hi->type,">")==0)
{struct values p;
p.type=1;
if(a.value>b.value)
p.value=1;
else
p.value=0;
return p;
}
else if(strcmp(hi->type,">=")==0)
{struct values p;
p.type=1;
if(a.value>=b.value)
p.value=1;
else
p.value=0;
return p;
}
}
}
else
{printf("NULL");
}
}
int is_left(struct tree* node)
{
if (node->left!=NULL)
return 1;
else
return 0;
}
int is_right(struct tree* node)
{
if (node->right!=NULL)
return 1;
else
return 0;
}
int is_dummy(struct tree* node)
{
if(strcmp(node->type,"dummy")==0)
return 1;
else
return 0;
}
struct tree* node_creat(char *n,int val,char op,char tp[20])
{
struct tree *ptr= (struct tree*) malloc(sizeof(struct tree));
ptr->name=n;
ptr->nval=val;
ptr->nop=op;
strcpy(ptr->type,tp);
ptr->left=NULL;
ptr->middle=NULL;
ptr->right=NULL;
}
struct tree* dummyalloc()
{
struct tree *hi=(struct tree*) malloc(sizeof(struct tree));
strcpy(hi->type,"dummy");
hi->name="\0";
hi->nval=-1;
hi->nop='\0';
hi->left=NULL;
hi->right=NULL;
hi->middle=NULL;
return hi;
}
void neweval(struct tree *node)
{if(node!=NULL)
{
if(is_dummy(node))
{
neweval(node->left);
//printf("%d ",evaluation(node->left));
neweval(node->right);
//printf("neweval!!!");
}
else
{
evaluation(node);
//printf("%d ",evaluation(node));
}
}
}
void Ginstall(char *NAME,int TYPE,int SIZE)
{
//struct Gsymbol *ptr=Gtable;
if (Gtable==NULL)
{
struct Gsymbol *ptr=(struct Gsymbol*) malloc(sizeof(struct Gsymbol));
ptr->name=NAME;
ptr->type=TYPE;
ptr->size=SIZE;
int *p=(int *) malloc(SIZE*sizeof(int));
ptr->bind=p;
ptr->next=NULL;
Gtable=ptr;
//printf("hahah");
}
else
{
struct Gsymbol *ptr=(struct Gsymbol*) malloc(sizeof(struct Gsymbol));
ptr->name=NAME;
ptr->type=TYPE;
ptr->size=SIZE;
int *p=(int *) malloc(SIZE*sizeof(int));
ptr->bind=p;
ptr->next=Gtable;
Gtable=ptr;
//printf("problem");
}
}
void display_s_table()
{
int i;
struct Gsymbol *ptr=Gtable;
printf("currpointer\tname\ttype\tsize\tnext\tbind\n");
while(ptr!=NULL)
{
printf("%p\t%s\t%d\t%d\t%p\t%d\n",ptr,ptr->name,ptr->type,ptr->size,ptr->next,*ptr->bind);
if (ptr->size >1)
{
printf("array");
for (i=0;i<ptr->size;i++)
printf("%d ",*(ptr->bind+i));
}
ptr=ptr->next;
}
}
struct Gsymbol * lookup(char * name)
{
struct Gsymbol *temp=Gtable;
while(temp!=NULL)
{
if(strcmp(name, temp->name)==0)
return temp;
temp=temp->next;
}
return NULL;
}
int main(int argc,char* argv[])
{
if(argc>1)
{
FILE *fp = fopen(argv[1],"r");
if(fp)
yyin = fp;
}
yyparse();
return 0;
}