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#include "sem_check.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "y.tab.h"
#include "pc.h"
void check_id(s, n)
scope *s;
char *n;
{
char buf[100];
if (scope_search(s, n)) {
snprintf(buf, 100, "\"%s\" already defined in scope...\n", n);
yyerror(buf);
}
}
node* check_exists(s, n)
scope *s;
char *n;
{
node *tmp;
char buf[100];
if(!(tmp = scope_safe_search(s,n))) {
snprintf(buf, 100, "Cannot find \"%s\"\n", n);
yyerror(buf);
}
return tmp;
}
int check_ret_type(t)
ptree *t;
{
char buf[100];
int type;
if (!t)
fprintf(stderr, "TYPE: %d\n", t->type);
switch (t->type) {
case ID:
if (!(t->attr.nval))
yyerror("Missing ID\n");
return t->attr.nval->var_type;
case ADDOP :
case MULOP :
if (!(t->r && t->l))
yyerror("Missing nodes\n");
if (t->attr.opval == AND || t->attr.opval == OR) {
if(t->l->ret_type == BOOL && t->r->ret_type ==BOOL)
return BOOL;
else {
type = t->l->ret_type == BOOL ?
t->r->ret_type : t->l->ret_type;
snprintf(buf, 100, "Mismached types:"
"Cannot use boolean "
"operator on type %s\n",
pretty_type(type));
break;
}
}
if (t->r->ret_type == t->l->ret_type)
return t->r->ret_type;
else
snprintf(buf, 100, "Mismached types: "
"Type %s "
"cannot be used with type %s\n",
pretty_type(t->r->ret_type),
pretty_type(t->l->ret_type));
break;
case RELOP :
if (!(t->r && t->l))
yyerror("Missing nodes\n");
if (t->r->ret_type == t->l->ret_type)
return BOOL;
else
snprintf(buf, 100, "Mismached types: "
"Type %s "
"cannot be compared to type %s\n",
pretty_type(t->r->ret_type),
pretty_type(t->l->ret_type));
break;
case NOT:
if (t->l && t->l->ret_type == BOOL)
return BOOL;
yyerror("NOT needs bool input\n");
break;
case INUM:
return INT;
case RNUM:
return REAL;
case ASSIGNOP:
if (!(t->r && t->l))
yyerror("Incomplete parse tree\n");
if (t->l->ret_type == t->r->ret_type)
return 1;
else
snprintf(buf, 100, "Mismached types: "
"Cannot assign type %s "
"to variable \"%s\" of type %s\n",
pretty_type(t->r->ret_type),
t->l->attr.nval->name,
pretty_type(t->l->attr.nval->var_type));
break;
case ARRAY_ACCESS:
if (!(t->r && t->l && t->l->attr.nval))
yyerror("Incorrect Array Access\n");
if (t->r->ret_type != INT) {
snprintf(buf, 100, "Cannot access array"
"with type %s\n",
pretty_type(t->r->ret_type));
break;
}
type = t->l->attr.nval -> var_type;
if (type == ARRAY - INT || type == ARRAY - REAL)
return ARRAY - type;
break;
case IF:
case WHILE:
if (!(t->r && t->l))
yyerror("Incomplete parse tree\n");
if (t->l->ret_type != BOOL)
yyerror("If condition must be of type BOOL\n");
return 1;
case FOR:
/*
FOR (0)
/ \
TD(0) STATEMENT(0)
/ \
ASSIGNOP(0) INUM(INT)
*/
if (!(t->r && t->l))
yyerror("Missing nodes\n");
if (t->l->ret_type == 1 && t->r->ret_type == 1)
return 1;
snprintf(buf, 100, "Incorrect types in for statement...\n");
break;
case TO:
case DT:
if (!(t->r && t->l))
yyerror("Missing nodes\n");
if (t->l->ret_type == 1 && t->r->ret_type == INT)
return 1;
snprintf(buf, 100, "Incorrect types HERE...\n");
case SUB:
return t->l->ret_type;
break;
case PCALL:
case FCALL:
if (t->l && t->l->attr.nval)
return t->l->attr.nval->var_type;
default:
return -200;
snprintf(buf, 100, "Unknown tree node: %d...\n", t->type);
}
yyerror(buf);
return -1;
}
void check_call(t)
ptree *t;
{
int argc, *argv;
if (!(t && (t->type == FCALL || t->type == PCALL)))
yyerror("Tree is not a function call\n");
if (!(t->l && t->l->attr.nval && t->l->attr.nval->func_info))
yyerror("Incorrect Call Tree\n");
if (!(strcmp(t->l->attr.nval->name, "write") && strcmp(t->l->attr.nval->name, "read")))
return;
argc = t->l->attr.nval->func_info->argc;
if (t->l->attr.nval->func_info->argc != count_args(t->r))
/*TODO add info about expected argument count*/
yyerror("Incorrect argument count");
assert(argv = malloc(sizeof(int) * argc));
get_call_types(t->r, argv, argc);
if (memcmp(argv, t->l->attr.nval->func_info->argv, argc * sizeof(int)))
/*TODO add info on which argument causes error*/
yyerror("Incorrect types in fuction arguments");
free(argv);
argv = NULL;
}
int func_ret(t, name)
ptree *t;
char *name;
{
if (!t)
return 0;
if (t->type == ASSIGNOP && t->l)
if (t->l->type == ID && !strcmp(t->l->attr.nval->name, name))
return 1;
return func_ret(t->l, name) || func_ret(t->r, name);
}
void check_func_return(t,name)
ptree *t;
char *name;
{
char buf[100];
if (!func_ret(t,name)) {
snprintf(buf, 100, "Function %s does not return a value\n",
name);
yyerror(buf);
}
}
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