From f4d98d609e09ae172dbcccff742cc654d8b51a52 Mon Sep 17 00:00:00 2001
From: Tucker Evans <tuckerevans24@gmail.com>
Date: Sat, 27 Jul 2019 21:09:10 -0400
Subject: Add initial scope checking

---
 pc.y    | 56 +++++++++++++++++++++++++++++++++++++++++++++++---------
 scope.c |  4 ++--
 tree.c  |  8 ++++----
 tree.h  |  3 +--
 4 files changed, 54 insertions(+), 17 deletions(-)

diff --git a/pc.y b/pc.y
index e7cb06e..dc6a05b 100644
--- a/pc.y
+++ b/pc.y
@@ -73,6 +73,8 @@ extern scope *cur_scope;
 %type <tval> simple_expr
 
 %type <tval> id_list
+%type <tval> param_list
+%type <tval> arguments
 %type <tval> expr_list
 
 %type <tval> statement
@@ -100,11 +102,15 @@ program
 id_list
 	:ID
 	{
-		$$ = mkid($1);
+		check_id(cur_scope, $1);
+
+		$$ = scope_insert(cur_scope, $1);
 	}
 	|id_list ',' ID
 	{
-		$$ = mktree(LIST, $1, mkid($3));
+		check_id(cur_scope, $3);
+
+		$$ = mktree(LIST, $1, scope_insert(cur_scope, $3));
 	}
 ;
 
@@ -156,18 +162,28 @@ sub_prog_declaration
 	}
 ;
 
+/*push_scope called in pc.l*/
 sub_prog_head
 	:FUNC ID arguments ':' standard_type ';'
 	{
+		check_id(cur_scope->prev, $2);
+		scope_insert(cur_scope->prev, $2);
+
+		cur_scope->ret_var = scope_insert(cur_scope, $2);
+		cur_scope->ret_var->var_type = $5;
+
 	}
 	|PROC ID arguments ';'
 	{
+		check_id(cur_scope->prev, $2);
+		scope_insert(cur_scope->prev, $2);
 	}
 ;
 
 arguments
 	:'(' param_list ')'
 	{
+		$$ = $2;
 	}
 	|/*empty*/
 ;
@@ -175,9 +191,11 @@ arguments
 param_list
 	:id_list ':' type
 	{
+		$$ = $1;
 	}
 	|param_list ';' id_list ':' type
 	{
+		$$ = mktree(LIST, $1, $3);
 	}
 ;
 
@@ -243,22 +261,33 @@ TD: TO | DT;
 var
 	:ID
 	{
-		$$ = mkid($1);
+		check_id(cur_scope, $1);
+		$$ = mkid(scope_insert(cur_scope,$1));
 	}
 	|ID '[' expr ']'
 	{
-		$$ = mktree(ARRAY_ACCESS, mkid($1), $3);
+		node* tmp;
+		check_id(cur_scope, $1);
+		tmp = scope_insert(cur_scope, $1);
+
+		$$ = mktree(ARRAY_ACCESS, mkid(tmp), $3);
 	}
 ;
 
 proc_statement
 	:ID
 	{
-		$$ = mkid($1);
+		node *tmp;
+
+		tmp = check_exists(cur_scope, $1);
+		$$ = mktree(PCALL, mkid(tmp), NULL);
 	}
 	|ID '(' expr_list ')'
 	{
-		$$ = mktree(PCALL, mkid($1), $3);
+		node *tmp;
+
+		tmp = check_exists(cur_scope, $1);
+		$$ = mktree(PCALL, mkid(tmp), $3);
 	}
 ;
 
@@ -309,15 +338,24 @@ term
 factor
 	:ID
 	{
-		$$ = mkid($1);
+		node *tmp;
+
+		tmp = check_exists(cur_scope, $1);
+		$$ = mkid(tmp);
 	}
 	|ID '[' expr ']'
 	{
-		$$ = mktree(ARRAY_ACCESS, mkid($1), $3);
+		node *tmp;
+
+		tmp = check_exists(cur_scope, $1);
+		$$ = mktree(ARRAY_ACCESS, mkid(tmp), $3);
 	}
 	|ID '(' expr_list ')'
 	{
-		$$ = mktree(FCALL, mkid($1), $3);
+		node *tmp;
+
+		tmp = check_exists(cur_scope, $1);
+		$$ = mktree(FCALL, mkid(tmp), $3);
 	}
 	|INUM
 	{
diff --git a/scope.c b/scope.c
index 379be97..11a9c5b 100644
--- a/scope.c
+++ b/scope.c
@@ -16,8 +16,8 @@ scope* mkscope()
 	for (i = 0; i < HASH_SIZE; i++)
 		p->table[i] = NULL;
 
-	p->next = NULL;
-	p->function_boundry = 0;
+	p->prev = NULL;
+	p->ret_var= NULL;
 
 	return p;
 }
diff --git a/tree.c b/tree.c
index 0301ec3..a1518f0 100644
--- a/tree.c
+++ b/tree.c
@@ -23,11 +23,11 @@ ptree *l, *r;
 	return t;
 }
 
-ptree* mkid(str)
-char *str;
+ptree* mkid(n)
+node *n;
 {
 	ptree *p = mktree(ID, NULL, NULL);
-	p->attr.sval = strdup(str); /* memory leak? double strdup*/
+	p->attr.nval = n; /* memory leak? double strdup*/
 	return p;
 }
 
@@ -94,7 +94,7 @@ int spaces;
 				fprintf(stderr, "[LIST]");
 				break;
 			case ID:
-				fprintf(stderr, "[ID: %s]", t->attr.sval);
+				fprintf(stderr, "[ID: %s]", t->attr.nval->name);
 				break;
 			case INUM:
 				fprintf(stderr, "[INUM: %d]", t->attr.ival);
diff --git a/tree.h b/tree.h
index b17c276..fffca94 100644
--- a/tree.h
+++ b/tree.h
@@ -6,7 +6,6 @@ typedef struct parse_tree {
 	union {
 		int ival; /* NUM */
 		float rval; /* RNUM */
-		char *sval; /* ID */
 		node *nval;
 		int opval; /* RELOP: LT LE GT GE EQ NE
 			      ADDOP: PLUS MINUS OR
@@ -20,7 +19,7 @@ void aux_tree_print(ptree*, int);
 void print_tree(ptree*);
 
 ptree* mktree(int, ptree*, ptree*);
-ptree* mkid(char*);
+ptree* mkid(node*);
 ptree* mkinum(int);
 ptree* mkrnum(float);
 ptree* mkop(int, int, ptree*, ptree*);
-- 
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