X-Git-Url: http://deadsoftware.ru/gitweb?p=dsw-obn.git;a=blobdiff_plain;f=src%2Foberon.c;h=cf1a570f8084f96c21234f7de51ad5e1c4406676;hp=f2310db26de0ab2b1bffb82efee2a4b346bf7052;hb=bc1691627adee054210acf7e801361fa574f8086;hpb=86c0ca1aafd465a3e0d4a9d6b1af661eba483ae1

diff --git a/src/oberon.c b/src/oberon.c
index f2310db..cf1a570 100644
--- a/src/oberon.c
+++ b/src/oberon.c
@@ -5,6 +5,7 @@
 #include <string.h>
 #include <assert.h>
 #include <stdbool.h>
+#include <math.h>
 
 #include "../include/oberon.h"
 
@@ -23,8 +24,6 @@ enum {
 	BEGIN,
 	ASSIGN,
 	INTEGER,
-	TRUE,
-	FALSE,
 	LPAREN,
 	RPAREN,
 	EQUAL,
@@ -51,8 +50,8 @@ enum {
 	TYPE,
 	ARRAY,
 	OF,
-	LBRACE,
-	RBRACE,
+	LBRACK,
+	RBRACK,
 	RECORD,
 	POINTER,
 	TO,
@@ -61,7 +60,25 @@ enum {
 	IMPORT,
 	REAL,
 	CHAR,
-	STRING
+	STRING,
+	IF,
+	THEN,
+	ELSE,
+	ELSIF,
+	WHILE,
+	DO,
+	REPEAT,
+	UNTIL,
+	FOR,
+	BY,
+	LOOP,
+	EXIT,
+	LBRACE,
+	RBRACE,
+	DOTDOT,
+	CASE,
+	BAR,
+	WITH
 };
 
 // =======================================================================
@@ -136,6 +153,15 @@ oberon_new_type_string(int size)
 	return x;
 }
 
+static oberon_type_t *
+oberon_new_type_set(int size)
+{
+	oberon_type_t * x;
+	x = oberon_new_type_ptr(OBERON_TYPE_SET);
+	x -> size = size;
+	return x;
+}
+
 // =======================================================================
 //   TABLE
 // ======================================================================= 
@@ -155,6 +181,7 @@ oberon_open_scope(oberon_context_t * ctx)
 		scope -> local = scope -> up -> local;
 		scope -> parent = scope -> up -> parent;
 		scope -> parent_type = scope -> up -> parent_type;
+		scope -> exit_label = scope -> up -> exit_label;
 	}
 
 	ctx -> decl = scope;
@@ -199,6 +226,22 @@ oberon_find_object(oberon_scope_t * scope, char * name, bool check_it)
 	return result;
 }
 
+static oberon_object_t *
+oberon_create_object(oberon_scope_t * scope, char * name, int class, bool export, bool read_only)
+{
+	oberon_object_t * newvar = malloc(sizeof *newvar);
+	memset(newvar, 0, sizeof *newvar);
+	newvar -> name = name;
+	newvar -> class = class;
+	newvar -> export = export;
+	newvar -> read_only = read_only;
+	newvar -> local = scope -> local;
+	newvar -> parent = scope -> parent;
+	newvar -> parent_type = scope -> parent_type;
+	newvar -> module = scope -> ctx -> mod;
+	return newvar;
+}
+
 static oberon_object_t *
 oberon_define_object(oberon_scope_t * scope, char * name, int class, bool export, bool read_only, bool check_upscope)
 {
@@ -221,17 +264,8 @@ oberon_define_object(oberon_scope_t * scope, char * name, int class, bool export
 		oberon_error(scope -> ctx, "already defined");
 	}
 
-	oberon_object_t * newvar = malloc(sizeof *newvar);
-	memset(newvar, 0, sizeof *newvar);
-	newvar -> name = name;
-	newvar -> class = class;
-	newvar -> export = export;
-	newvar -> read_only = read_only;
-	newvar -> local = scope -> local;
-	newvar -> parent = scope -> parent;
-	newvar -> parent_type = scope -> parent_type;
-	newvar -> module = scope -> ctx -> mod;
-
+	oberon_object_t * newvar;
+	newvar = oberon_create_object(scope, name, class, export, read_only);
 	x -> next = newvar;
 
 	return newvar;
@@ -308,14 +342,6 @@ oberon_read_ident(oberon_context_t * ctx)
 	{
 		ctx -> token = BEGIN;
 	}
-	else if(strcmp(ident, "TRUE") == 0)
-	{
-		ctx -> token = TRUE;
-	}
-	else if(strcmp(ident, "FALSE") == 0)
-	{
-		ctx -> token = FALSE;
-	}
 	else if(strcmp(ident, "OR") == 0)
 	{
 		ctx -> token = OR;
@@ -380,8 +406,67 @@ oberon_read_ident(oberon_context_t * ctx)
 	{
 		ctx -> token = IS;
 	}
+	else if(strcmp(ident, "IF") == 0)
+	{
+		ctx -> token = IF;
+	}
+	else if(strcmp(ident, "THEN") == 0)
+	{
+		ctx -> token = THEN;
+	}
+	else if(strcmp(ident, "ELSE") == 0)
+	{
+		ctx -> token = ELSE;
+	}
+	else if(strcmp(ident, "ELSIF") == 0)
+	{
+		ctx -> token = ELSIF;
+	}
+	else if(strcmp(ident, "WHILE") == 0)
+	{
+		ctx -> token = WHILE;
+	}
+	else if(strcmp(ident, "DO") == 0)
+	{
+		ctx -> token = DO;
+	}
+	else if(strcmp(ident, "REPEAT") == 0)
+	{
+		ctx -> token = REPEAT;
+	}
+	else if(strcmp(ident, "UNTIL") == 0)
+	{
+		ctx -> token = UNTIL;
+	}
+	else if(strcmp(ident, "FOR") == 0)
+	{
+		ctx -> token = FOR;
+	}
+	else if(strcmp(ident, "BY") == 0)
+	{
+		ctx -> token = BY;
+	}
+	else if(strcmp(ident, "LOOP") == 0)
+	{
+		ctx -> token = LOOP;
+	}
+	else if(strcmp(ident, "EXIT") == 0)
+	{
+		ctx -> token = EXIT;
+	}
+	else if(strcmp(ident, "CASE") == 0)
+	{
+		ctx -> token = CASE;
+	}
+	else if(strcmp(ident, "WITH") == 0)
+	{
+		ctx -> token = WITH;
+	}
 }
 
+#define ISHEXDIGIT(x) \
+	(((x) >= '0' && (x) <= '9') || ((x) >= 'A' && (x) <= 'F'))
+
 static void
 oberon_read_number(oberon_context_t * ctx)
 {
@@ -409,10 +494,10 @@ oberon_read_number(oberon_context_t * ctx)
 
 	end_i = ctx -> code_index;
 
-	if(isxdigit(ctx -> c))
+	if(ISHEXDIGIT(ctx -> c))
 	{
 		mode = 1;
-		while(isxdigit(ctx -> c))
+		while(ISHEXDIGIT(ctx -> c))
 		{
 			oberon_get_char(ctx);
 		}
@@ -436,37 +521,43 @@ oberon_read_number(oberon_context_t * ctx)
 	}
 	else if(ctx -> c == '.')
 	{
-		mode = 2;
 		oberon_get_char(ctx);
-
-		while(isdigit(ctx -> c))
+		if(ctx -> c == '.')
 		{
-			oberon_get_char(ctx);
+			/* Чит: избегаем конфликта с DOTDOT */
+			ctx -> code_index -= 1;
 		}
-
-		if(ctx -> c == 'E' || ctx -> c == 'D')
+		else
 		{
-			exp_i = ctx -> code_index;
-
-			if(ctx -> c == 'D')
-			{
-				mode = 3;
-			}
-
-			oberon_get_char(ctx);
+			mode = 2;
 
-			if(ctx -> c == '+' || ctx -> c == '-')
+			while(isdigit(ctx -> c))
 			{
 				oberon_get_char(ctx);
 			}
 
-			while(isdigit(ctx -> c))
+			if(ctx -> c == 'E' || ctx -> c == 'D')
 			{
+				exp_i = ctx -> code_index;
+
+				if(ctx -> c == 'D')
+				{
+					mode = 3;
+				}
+
 				oberon_get_char(ctx);
-			}
 
-		}
+				if(ctx -> c == '+' || ctx -> c == '-')
+				{
+					oberon_get_char(ctx);
+				}
 
+				while(isdigit(ctx -> c))
+				{
+					oberon_get_char(ctx);
+				}	
+			}
+		}
 		end_i = ctx -> code_index;
 	}
 
@@ -599,8 +690,6 @@ static void oberon_read_string(oberon_context_t * ctx)
 
 	ctx -> token = STRING;
 	ctx -> string = string;
-
-	printf("oberon_read_string: string ((%s))\n", string);
 }
 
 static void oberon_read_token(oberon_context_t * ctx);
@@ -630,6 +719,11 @@ oberon_read_symbol(oberon_context_t * ctx)
 		case '.':
 			ctx -> token = DOT;
 			oberon_get_char(ctx);
+			if(ctx -> c == '.')
+			{
+				ctx -> token = DOTDOT;
+				oberon_get_char(ctx);
+			}
 			break;
 		case '(':
 			ctx -> token = LPAREN;
@@ -705,11 +799,11 @@ oberon_read_symbol(oberon_context_t * ctx)
 			oberon_get_char(ctx);
 			break;
 		case '[':
-			ctx -> token = LBRACE;
+			ctx -> token = LBRACK;
 			oberon_get_char(ctx);
 			break;
 		case ']':
-			ctx -> token = RBRACE;
+			ctx -> token = RBRACK;
 			oberon_get_char(ctx);
 			break;
 		case '^':
@@ -722,6 +816,18 @@ oberon_read_symbol(oberon_context_t * ctx)
 		case '\'':
 			oberon_read_string(ctx);
 			break;			
+		case '{':
+			ctx -> token = LBRACE;
+			oberon_get_char(ctx);
+			break;
+		case '}':
+			ctx -> token = RBRACE;
+			oberon_get_char(ctx);
+			break;
+		case '|':
+			ctx -> token = BAR;
+			oberon_get_char(ctx);
+			break;
 		default:
 			oberon_error(ctx, "invalid char %c", ctx -> c);
 			break;
@@ -802,12 +908,18 @@ oberon_make_unary_op(oberon_context_t * ctx, int token, oberon_expr_t * a)
 
 	if(token == MINUS)
 	{
-		if(result -> class != OBERON_TYPE_INTEGER)
+		if(result -> class == OBERON_TYPE_SET)
+		{
+			expr = oberon_new_operator(OP_COMPLEMENTATION, result, a, NULL);
+		}
+		else if(result -> class == OBERON_TYPE_INTEGER)
+		{
+			expr = oberon_new_operator(OP_UNARY_MINUS, result, a, NULL);
+		}
+		else
 		{
 			oberon_error(ctx, "incompatible operator type");
 		}
-
-		expr = oberon_new_operator(OP_UNARY_MINUS, result, a, NULL);
 	}
 	else if(token == NOT)
 	{
@@ -872,11 +984,8 @@ oberno_make_record_cast(oberon_context_t * ctx, oberon_expr_t * expr, oberon_typ
 	oberon_type_t * from = expr -> result;
 	oberon_type_t * to = rec;
 
-	printf("oberno_make_record_cast: from class %i to class %i\n", from -> class, to -> class);
-
 	if(from -> class == OBERON_TYPE_POINTER && to -> class == OBERON_TYPE_POINTER)
 	{
-		printf("oberno_make_record_cast: pointers\n");
 		from = from -> base;
 		to = to -> base;
 	}
@@ -943,23 +1052,73 @@ oberon_check_record_compatibility(oberon_context_t * ctx, oberon_type_t * from,
 	}
 }
 
+static void
+oberon_check_dst(oberon_context_t * ctx, oberon_expr_t * dst)
+{
+	if(dst -> is_item == false)
+	{
+		oberon_error(ctx, "not variable");
+	}
+
+	switch(dst -> item.mode)
+	{
+		case MODE_VAR:
+		case MODE_CALL:
+		case MODE_INDEX:
+		case MODE_FIELD:
+		case MODE_DEREF:
+		case MODE_NEW:
+			/* accept */
+			break;
+		default:
+			oberon_error(ctx, "not variable");
+			break;
+	}
+}
+
+static void
+oberon_check_src(oberon_context_t * ctx, oberon_expr_t * src)
+{
+	if(src -> is_item)
+	{
+		if(src -> item.mode == MODE_TYPE)
+		{
+			oberon_error(ctx, "not variable");
+		}
+	}
+}
+
 static oberon_expr_t *
 oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t * pref)
 {
 	// Допускается:
 	//  Если классы типов равны
 	//  Если INTEGER переводится в REAL
+	//  Есди STRING переводится в CHAR
 	//  Есди STRING переводится в ARRAY OF CHAR
 
+	oberon_check_src(ctx, expr);
+
 	bool error = false;
 	if(pref -> class != expr -> result -> class)
 	{
-		printf("expr class %i\n", expr -> result -> class);
-		printf("pref class %i\n", pref -> class);
-
 		if(expr -> result -> class == OBERON_TYPE_STRING)
 		{
-			if(pref -> class == OBERON_TYPE_ARRAY)
+			if(pref -> class == OBERON_TYPE_CHAR)
+			{
+				if(expr -> is_item && expr -> item.mode == MODE_STRING)
+				{
+					if(strlen(expr -> item.string) != 1)
+					{
+						error = true;
+					}
+				}
+				else
+				{
+					error = true;
+				}
+			}
+			else if(pref -> class == OBERON_TYPE_ARRAY)
 			{
 				if(pref -> base -> class != OBERON_TYPE_CHAR)
 				{
@@ -989,7 +1148,16 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
 		oberon_error(ctx, "oberon_autocast_to: incompatible types");
 	}
 
-	if(pref -> class == OBERON_TYPE_INTEGER || pref -> class == OBERON_TYPE_REAL)
+	if(pref -> class == OBERON_TYPE_CHAR)
+	{
+		if(expr -> result -> class == OBERON_TYPE_STRING)
+		{
+			int c = expr -> item.string[0];
+			expr = oberon_new_item(MODE_CHAR, ctx -> char_type, true);
+			expr -> item.integer = c;
+		}
+	}
+	else if(pref -> class == OBERON_TYPE_INTEGER || pref -> class == OBERON_TYPE_REAL)
 	{
 		if(expr -> result -> size > pref -> size)
 		{
@@ -1064,13 +1232,21 @@ oberon_autocast_call(oberon_context_t * ctx, oberon_item_t * desig)
 	{
 		if(param -> class == OBERON_CLASS_VAR_PARAM)
 		{
+			if(arg -> result != param -> type)
+			{
+				oberon_error(ctx, "incompatible type");
+			}
 			if(arg -> read_only)
 			{
 				oberon_error(ctx, "assign to read-only var");
 			}
+			casted[i] = arg;
+		}
+		else
+		{
+			casted[i] = oberon_autocast_to(ctx, arg, param -> type);
 		}
 
-		casted[i] = oberon_autocast_to(ctx, arg, param -> type);
 		arg = arg -> next;
 		param = param -> next;
 	}
@@ -1160,58 +1336,6 @@ oberon_make_call_proc(oberon_context_t * ctx, oberon_item_t * item, int num_args
 	}
 }
 
-/*
-static void
-oberon_make_call_proc(oberon_context_t * ctx, oberon_object_t * proc, int num_args, oberon_expr_t * list_args)
-{
-	switch(proc -> class)
-	{
-		case OBERON_CLASS_PROC:
-			if(proc -> class != OBERON_CLASS_PROC)
-			{
-				oberon_error(ctx, "not a procedure");
-			}
-			break;
-		case OBERON_CLASS_VAR:
-		case OBERON_CLASS_VAR_PARAM:
-		case OBERON_CLASS_PARAM:
-			if(proc -> type -> class != OBERON_TYPE_PROCEDURE)
-			{
-				oberon_error(ctx, "not a procedure");
-			}
-			break;
-		default:
-			oberon_error(ctx, "not a procedure");
-			break;
-	}
-
-	if(proc -> sysproc)
-	{
-		if(proc -> genproc == NULL)
-		{
-			oberon_error(ctx, "requres non-typed procedure");
-		}
-
-		proc -> genproc(ctx, num_args, list_args);
-	}
-	else
-	{
-		if(proc -> type -> base -> class != OBERON_TYPE_VOID)
-		{
-			oberon_error(ctx, "attempt to call function as non-typed procedure");
-		}
-
-		oberon_expr_t * call;
-		call = oberon_new_item(MODE_CALL, proc -> type -> base, 1);
-		call -> item.var = proc;
-		call -> item.num_args = num_args;
-		call -> item.args = list_args;
-		oberon_autocast_call(ctx, call);
-		oberon_generate_call_proc(ctx, call);
-	}
-}
-*/
-
 #define ISEXPR(x) \
 	(((x) == PLUS) \
 	|| ((x) == MINUS) \
@@ -1222,14 +1346,11 @@ oberon_make_call_proc(oberon_context_t * ctx, oberon_object_t * proc, int num_ar
 	|| ((x) == STRING) \
 	|| ((x) == NIL) \
 	|| ((x) == LPAREN) \
-	|| ((x) == NOT) \
-	|| ((x) == TRUE) \
-	|| ((x) == FALSE)) 
+	|| ((x) == NOT))
 
 static oberon_expr_t *
 oberno_make_dereferencing(oberon_context_t * ctx, oberon_expr_t * expr)
 {
-	printf("oberno_make_dereferencing\n");
 	if(expr -> result -> class != OBERON_TYPE_POINTER)
 	{
 		oberon_error(ctx, "not a pointer");
@@ -1339,7 +1460,7 @@ oberon_make_record_selector(oberon_context_t * ctx, oberon_expr_t * expr, char *
 }
 
 #define ISSELECTOR(x) \
-	(((x) == LBRACE) \
+	(((x) == LBRACK) \
 	|| ((x) == DOT) \
 	|| ((x) == UPARROW) \
 	|| ((x) == LPAREN))
@@ -1378,9 +1499,28 @@ oberon_qualident(oberon_context_t * ctx, char ** xname, int check)
 }
 
 static oberon_expr_t *
-oberon_designator(oberon_context_t * ctx)
+oberon_ident_item(oberon_context_t * ctx, char * name)
+{
+	bool read_only;
+	oberon_object_t * x;
+	oberon_expr_t * expr;
+
+	x = oberon_find_object(ctx -> decl, name, true);
+
+	read_only = false;
+	if(x -> class == OBERON_CLASS_CONST || x -> class == OBERON_CLASS_PROC)
+	{
+		read_only = true;
+	}
+
+	expr = oberon_new_item(MODE_VAR, x -> type, read_only);
+	expr -> item.var = x;
+	return expr;
+}
+
+static oberon_expr_t *
+oberon_qualident_expr(oberon_context_t * ctx)
 {
-	char * name;
 	oberon_object_t * var;
 	oberon_expr_t * expr;
 
@@ -1401,20 +1541,35 @@ oberon_designator(oberon_context_t * ctx)
 			// TODO copy value
 			expr = (oberon_expr_t *) var -> value;
 			break;
+		case OBERON_CLASS_TYPE:
+			expr = oberon_new_item(MODE_TYPE, var -> type, read_only);
+			break;
 		case OBERON_CLASS_VAR:
 		case OBERON_CLASS_VAR_PARAM:
 		case OBERON_CLASS_PARAM:
 			expr = oberon_new_item(MODE_VAR, var -> type, read_only);
 			break;
 		case OBERON_CLASS_PROC:
-			expr = oberon_new_item(MODE_VAR, var -> type, 1);
+			expr = oberon_new_item(MODE_VAR, var -> type, true);
 			break;
 		default:
 			oberon_error(ctx, "invalid designator");
 			break;
 	}
+
 	expr -> item.var = var;
 
+	return expr;
+}
+
+static oberon_expr_t *
+oberon_designator(oberon_context_t * ctx)
+{
+	char * name;
+	oberon_expr_t * expr;
+
+	expr = oberon_qualident_expr(ctx);
+
 	while(expr -> result -> class != OBERON_TYPE_PROCEDURE && ISSELECTOR(ctx -> token))
 	{
 		switch(ctx -> token)
@@ -1424,12 +1579,12 @@ oberon_designator(oberon_context_t * ctx)
 				name = oberon_assert_ident(ctx);
 				expr = oberon_make_record_selector(ctx, expr, name);
 				break;
-			case LBRACE:
-				oberon_assert_token(ctx, LBRACE);
+			case LBRACK:
+				oberon_assert_token(ctx, LBRACK);
 				int num_indexes = 0;
 				oberon_expr_t * indexes = NULL;
 				oberon_expr_list(ctx, &num_indexes, &indexes, 0);
-				oberon_assert_token(ctx, RBRACE);
+				oberon_assert_token(ctx, RBRACK);
 
 				for(int i = 0; i < num_indexes; i++)
 				{
@@ -1530,6 +1685,79 @@ oberon_get_type_of_int_value(oberon_context_t * ctx, int64_t i)
 	}
 }
 
+static oberon_expr_t *
+oberon_integer_item(oberon_context_t * ctx, int64_t i)
+{
+	oberon_expr_t * expr;
+	oberon_type_t * result;
+	result = oberon_get_type_of_int_value(ctx, i);
+	expr = oberon_new_item(MODE_INTEGER, result, true);
+	expr -> item.integer = i;
+	return expr;
+}
+
+static oberon_expr_t *
+oberon_element(oberon_context_t * ctx)
+{
+	oberon_expr_t * e1;
+	oberon_expr_t * e2;
+
+	e1 = oberon_expr(ctx);
+	if(e1 -> result -> class != OBERON_TYPE_INTEGER)
+	{
+		oberon_error(ctx, "expected integer");
+	}
+
+	e2 = NULL;
+	if(ctx -> token == DOTDOT)
+	{
+		oberon_assert_token(ctx, DOTDOT);
+		e2 = oberon_expr(ctx);
+		if(e2 -> result -> class != OBERON_TYPE_INTEGER)
+		{
+			oberon_error(ctx, "expected integer");
+		}
+	}
+
+	oberon_expr_t * set;
+	set = oberon_new_operator(OP_RANGE, ctx -> set_type, e1, e2);
+	return set;
+}
+
+static oberon_expr_t *
+oberon_set(oberon_context_t * ctx)
+{
+	oberon_expr_t * set;
+	oberon_expr_t * elements;
+	set = oberon_new_item(MODE_SET, ctx -> set_type, true);
+	set -> item.integer = 0;
+
+	oberon_assert_token(ctx, LBRACE);
+	if(ISEXPR(ctx -> token))
+	{
+		elements = oberon_element(ctx);
+		set = oberon_new_operator(OP_UNION, ctx -> set_type, set, elements);
+		while(ctx -> token == COMMA)
+		{
+			oberon_assert_token(ctx, COMMA);
+			elements = oberon_element(ctx);
+			set = oberon_new_operator(OP_UNION, ctx -> set_type, set, elements);
+		}
+	}
+	oberon_assert_token(ctx, RBRACE);
+
+	return set;
+}
+
+static oberon_expr_t *
+oberon_make_boolean(oberon_context_t * ctx, bool cond)
+{
+	oberon_expr_t * expr;
+	expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, true);
+	expr -> item.integer = cond;
+	return expr;
+}
+
 static oberon_expr_t *
 oberon_factor(oberon_context_t * ctx)
 {
@@ -1543,9 +1771,7 @@ oberon_factor(oberon_context_t * ctx)
 			expr = oberon_opt_func_parens(ctx, expr);
 			break;
 		case INTEGER:
-			result = oberon_get_type_of_int_value(ctx, ctx -> integer);
-			expr = oberon_new_item(MODE_INTEGER, result, true);
-			expr -> item.integer = ctx -> integer;
+			expr = oberon_integer_item(ctx, ctx -> integer);
 			oberon_assert_token(ctx, INTEGER);
 			break;
 		case CHAR:
@@ -1566,15 +1792,8 @@ oberon_factor(oberon_context_t * ctx)
 			expr -> item.real = ctx -> real;
 			oberon_assert_token(ctx, REAL);
 			break;
-		case TRUE:
-			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, true);
-			expr -> item.boolean = true;
-			oberon_assert_token(ctx, TRUE);
-			break;
-		case FALSE:
-			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, true);
-			expr -> item.boolean = false;
-			oberon_assert_token(ctx, FALSE);
+		case LBRACE:
+			expr = oberon_set(ctx);
 			break;
 		case LPAREN:
 			oberon_assert_token(ctx, LPAREN);
@@ -1633,14 +1852,72 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
 	oberon_expr_t * expr;
 	oberon_type_t * result;
 
-	if(ITMAKESBOOLEAN(token))
+	bool error = false;
+	if(token == IN)
 	{
-		if(ITUSEONLYINTEGER(token))
+		if(a -> result -> class != OBERON_TYPE_INTEGER)
 		{
-			if(a -> result -> class == OBERON_TYPE_INTEGER
+			oberon_error(ctx, "must be integer");
+		}
+
+		if(b -> result -> class != OBERON_TYPE_SET)
+		{
+			oberon_error(ctx, "must be set");
+		}
+
+		result = ctx -> bool_type;
+		expr = oberon_new_operator(OP_IN, result, a, b);
+	}
+	else if(token == IS)
+	{
+		oberon_type_t * v = a -> result;
+		if(v -> class == OBERON_TYPE_POINTER)
+		{
+			v = v -> base;
+			if(v -> class != OBERON_TYPE_RECORD)
+			{
+				oberon_error(ctx, "must be record");
+			}
+		}
+		else if(v -> class != OBERON_TYPE_RECORD)
+		{
+			oberon_error(ctx, "must be record");
+		}		
+
+		if(b -> is_item == false || b -> item.mode != MODE_TYPE)
+		{
+			oberon_error(ctx, "requires type");
+		}
+
+		oberon_type_t * t = b -> result;
+		if(t -> class == OBERON_TYPE_POINTER)
+		{
+			t = t -> base;
+			if(t -> class != OBERON_TYPE_RECORD)
+			{
+				oberon_error(ctx, "must be record");
+			}
+		}
+		else if(t -> class != OBERON_TYPE_RECORD)
+		{
+			oberon_error(ctx, "must be record");
+		}
+
+		result = ctx -> bool_type;
+		expr = oberon_new_operator(OP_IS, result, a, b);
+	}
+	else if(ITMAKESBOOLEAN(token))
+	{
+		if(ITUSEONLYINTEGER(token))
+		{
+			if(a -> result -> class == OBERON_TYPE_INTEGER
 				|| b -> result -> class == OBERON_TYPE_INTEGER
 				|| a -> result -> class == OBERON_TYPE_REAL
 				|| b -> result -> class == OBERON_TYPE_REAL)
+			{
+				// accept
+			}
+			else
 			{
 				oberon_error(ctx, "used only with numeric types");
 			}
@@ -1696,10 +1973,21 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
 	}
 	else if(token == SLASH)
 	{
-		oberon_autocast_to_real(ctx, &a);
-		oberon_autocast_to_real(ctx, &b);
-		oberon_autocast_binary_op(ctx, &a, &b);
-		expr = oberon_new_operator(OP_DIV, a -> result, a, b);
+		if(a -> result -> class == OBERON_TYPE_SET
+			|| b -> result -> class == OBERON_TYPE_SET)
+		{
+			oberon_autocast_binary_op(ctx, &a, &b);
+			result = a -> result;
+			expr = oberon_new_operator(OP_SYM_DIFFERENCE, result, a, b);
+		}
+		else
+		{
+			oberon_autocast_to_real(ctx, &a);
+			oberon_autocast_to_real(ctx, &b);
+			oberon_autocast_binary_op(ctx, &a, &b);
+			result = a -> result;
+			expr = oberon_new_operator(OP_DIV, result, a, b);
+		}
 	}
 	else if(token == DIV)
 	{
@@ -1715,29 +2003,58 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
 	else
 	{
 		oberon_autocast_binary_op(ctx, &a, &b);
-
-		if(token == PLUS)
-		{
-			expr = oberon_new_operator(OP_ADD, a -> result, a, b);
-		}
-		else if(token == MINUS)
-		{
-			expr = oberon_new_operator(OP_SUB, a -> result, a, b);
-		}
-		else if(token == STAR)
+		result = a -> result;
+		if(result -> class == OBERON_TYPE_SET)
 		{
-			expr = oberon_new_operator(OP_MUL, a -> result, a, b);
+			switch(token)
+			{
+				case PLUS:
+					expr = oberon_new_operator(OP_UNION, result, a, b);
+					break;
+				case MINUS:
+					expr = oberon_new_operator(OP_DIFFERENCE, result, a, b);
+					break;
+				case STAR:
+					expr = oberon_new_operator(OP_INTERSECTION, result, a, b);
+					break;
+				default:
+					error = true;
+					break;
+			}
 		}
-		else if(token == MOD)
+		else if(result -> class == OBERON_TYPE_INTEGER
+			|| result -> class == OBERON_TYPE_REAL)
 		{
-			expr = oberon_new_operator(OP_MOD, a -> result, a, b);
+			switch(token)
+			{
+				case PLUS:
+					expr = oberon_new_operator(OP_ADD, result, a, b);
+					break;
+				case MINUS:
+					expr = oberon_new_operator(OP_SUB, result, a, b);
+					break;
+				case STAR:
+					expr = oberon_new_operator(OP_MUL, result, a, b);
+					break;
+				case MOD:
+					expr = oberon_new_operator(OP_MOD, result, a, b);
+					break;
+				default:
+					error = true;
+					break;
+			}
 		}
 		else
 		{
-			oberon_error(ctx, "oberon_make_bin_op: bin wat");
+			error = true;
 		}
 	}
 
+	if(error)
+	{
+		oberon_error(ctx, "invalid operation");
+	}
+
 	return expr;
 }
 
@@ -1822,17 +2139,37 @@ oberon_expr(oberon_context_t * ctx)
 	return expr;
 }
 
-static oberon_item_t *
-oberon_const_expr(oberon_context_t * ctx)
+static void
+oberon_check_const(oberon_context_t * ctx, oberon_expr_t * expr)
 {
-	oberon_expr_t * expr;
-	expr = oberon_expr(ctx);
-
 	if(expr -> is_item == 0)
 	{
 		oberon_error(ctx, "const expression are required");
 	}
 
+	switch(expr -> item.mode)
+	{
+		case MODE_INTEGER:
+		case MODE_BOOLEAN:
+		case MODE_NIL:
+		case MODE_REAL:
+		case MODE_CHAR:
+		case MODE_STRING:
+		case MODE_TYPE:
+			/* accept */
+			break;
+		default:
+			oberon_error(ctx, "const expression are required");
+			break;
+	}
+}
+
+static oberon_item_t *
+oberon_const_expr(oberon_context_t * ctx)
+{
+	oberon_expr_t * expr;
+	expr = oberon_expr(ctx);
+	oberon_check_const(ctx, expr);
 	return (oberon_item_t *) expr;
 }
 
@@ -2141,13 +2478,20 @@ oberon_proc_decl(oberon_context_t * ctx)
 	signature = oberon_new_type_ptr(OBERON_TYPE_VOID);
 	oberon_opt_formal_pars(ctx, &signature);	
 
-	oberon_initialize_decl(ctx);
+	//oberon_initialize_decl(ctx);
 	oberon_generator_init_type(ctx, signature);
 	oberon_close_scope(ctx -> decl);
 
 	oberon_object_t * proc;
 	proc = oberon_find_object(ctx -> decl, name, 0);
-	if(proc != NULL)
+	if(proc == NULL)
+	{
+		proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC, export, read_only, false);
+		proc -> type = signature;
+		proc -> scope = proc_scope;
+		oberon_generator_init_proc(ctx, proc);
+	}
+	else
 	{
 		if(proc -> class != OBERON_CLASS_PROC)
 		{
@@ -2169,16 +2513,15 @@ oberon_proc_decl(oberon_context_t * ctx)
 
 		oberon_compare_signatures(ctx, proc -> type, signature);
 	}
-	else
+
+	proc_scope -> parent = proc;
+	oberon_object_t * param = proc_scope -> list -> next;
+	while(param)
 	{
-		proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC, export, read_only, false);
-		proc -> type = signature;
-		proc -> scope = proc_scope;
-		oberon_generator_init_proc(ctx, proc);
+		param -> parent = proc;
+		param = param -> next;
 	}
 
-	proc -> scope -> parent = proc;
-
 	if(forward == 0)
 	{
 		proc -> linked = 1;
@@ -2531,6 +2874,11 @@ oberon_prevent_recursive_record(oberon_context_t * ctx, oberon_type_t * type)
 
 	type -> recursive = 1;
 
+	if(type -> base)
+	{
+		oberon_prevent_recursive_record(ctx, type -> base);
+	}
+
 	int num_fields = type -> num_decl;
 	oberon_object_t * field = type -> decl;
 	for(int i = 0; i < num_fields; i++)
@@ -2845,6 +3193,25 @@ oberon_decl_seq(oberon_context_t * ctx)
 	oberon_prevent_undeclarated_procedures(ctx);
 }
 
+static oberon_expr_t *
+oberon_make_temp_var_item(oberon_context_t * ctx, oberon_type_t * type)
+{
+	oberon_object_t * x;
+	oberon_expr_t * expr;
+
+	x = oberon_create_object(ctx -> decl, "TEMP", OBERON_CLASS_VAR, false, false);
+	x -> local = true;
+	x -> type = type;
+	oberon_generator_init_temp_var(ctx, x);
+
+	expr = oberon_new_item(MODE_VAR, type, false);
+	expr -> item.var = x;
+	return expr;
+}
+
+static void
+oberon_statement_seq(oberon_context_t * ctx);
+
 static void
 oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
 {
@@ -2853,10 +3220,172 @@ oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
 		oberon_error(ctx, "read-only destination");
 	}
 
+	oberon_check_dst(ctx, dst);
 	src = oberon_autocast_to(ctx, src, dst -> result);
 	oberon_generate_assign(ctx, src, dst);
 }
 
+static oberon_expr_t *
+oberon_case_labels(oberon_context_t * ctx, oberon_expr_t * val)
+{
+	oberon_expr_t * e1;
+	oberon_expr_t * e2;
+	oberon_expr_t * cond;
+	oberon_expr_t * cond2;
+
+	e1 = (oberon_expr_t *) oberon_const_expr(ctx);
+	oberon_autocast_to(ctx, e1, val -> result);
+	
+	e2 = NULL;
+	if(ctx -> token == DOTDOT)
+	{
+		oberon_assert_token(ctx, DOTDOT);
+		e2 = (oberon_expr_t *) oberon_const_expr(ctx);
+		oberon_autocast_to(ctx, e2, val -> result);
+	}
+
+	if(e2 == NULL)
+	{
+		/* val == e1 */
+		cond = oberon_make_bin_op(ctx, EQUAL, val, e1);
+	}
+	else
+	{
+		/* val >= e1 && val <= e2 */
+		cond = oberon_make_bin_op(ctx, GEQ, val, e1);
+		cond2 = oberon_make_bin_op(ctx, LEQ, val, e2);
+		cond = oberon_make_bin_op(ctx, AND, cond, cond2);
+	}
+
+	return cond;
+}
+
+static void
+oberon_case(oberon_context_t * ctx, oberon_expr_t * val, gen_label_t * end)
+{
+	oberon_expr_t * cond;
+	oberon_expr_t * cond2;
+	gen_label_t * this_end;
+
+	if(ISEXPR(ctx -> token))
+	{
+		this_end = oberon_generator_reserve_label(ctx);
+
+		cond = oberon_case_labels(ctx, val);
+		while(ctx -> token == COMMA)
+		{
+			oberon_assert_token(ctx, COMMA);
+			/* cond || cond2 */
+			cond2 = oberon_case_labels(ctx, val);
+			cond = oberon_make_bin_op(ctx, OR, cond, cond2);
+		}
+		oberon_assert_token(ctx, COLON);
+
+		oberon_generate_branch(ctx, cond, false, this_end);
+		oberon_statement_seq(ctx);
+		oberon_generate_goto(ctx, end);
+
+		oberon_generate_label(ctx, this_end);
+	}
+}
+
+static void
+oberon_case_statement(oberon_context_t * ctx)
+{
+	oberon_expr_t * val;
+	oberon_expr_t * expr;
+	gen_label_t * end;
+
+	end = oberon_generator_reserve_label(ctx);
+
+	oberon_assert_token(ctx, CASE);
+	expr = oberon_expr(ctx);
+	val = oberon_make_temp_var_item(ctx, expr -> result);
+	oberon_assign(ctx, expr, val);
+	oberon_assert_token(ctx, OF);
+	oberon_case(ctx, val, end);
+	while(ctx -> token == BAR)
+	{
+		oberon_assert_token(ctx, BAR);
+		oberon_case(ctx, val, end);
+	}
+
+	if(ctx -> token == ELSE)
+	{
+		oberon_assert_token(ctx, ELSE);
+		oberon_statement_seq(ctx);
+	}
+
+	oberon_generate_label(ctx, end);
+	oberon_assert_token(ctx, END);
+}
+
+static void
+oberon_with_guard_do(oberon_context_t * ctx, gen_label_t * end)
+{
+	oberon_expr_t * val;
+	oberon_expr_t * var;
+	oberon_expr_t * type;
+	oberon_expr_t * cond;
+	oberon_expr_t * cast;
+	oberon_type_t * old_type;
+	gen_var_t * old_var;
+	gen_label_t * this_end;
+
+	this_end = oberon_generator_reserve_label(ctx);
+
+	var = oberon_qualident_expr(ctx);
+	oberon_assert_token(ctx, COLON);
+	type = oberon_qualident_expr(ctx);
+	cond = oberon_make_bin_op(ctx, IS, var, type);
+
+	oberon_assert_token(ctx, DO);
+	oberon_generate_branch(ctx, cond, false, this_end);
+
+	/* Сохраняем ссылку во временной переменной */
+	val = oberon_make_temp_var_item(ctx, type -> result);
+	cast = oberno_make_record_cast(ctx, var, type -> result);
+	oberon_assign(ctx, cast, val);
+	/* Подменяем тип у оригинальной переменной */
+	old_type = var -> item.var -> type;
+	var -> item.var -> type = type -> result;
+	/* Подменяем ссылку на переменную */
+	old_var = var -> item.var -> gen_var;
+	var -> item.var -> gen_var = val -> item.var -> gen_var;
+
+	oberon_statement_seq(ctx);
+	oberon_generate_goto(ctx, end);
+	oberon_generate_label(ctx, this_end);
+
+	/* Возвращаем исходное состояние */
+	var -> item.var -> gen_var = old_var;
+	var -> item.var -> type = old_type;
+}
+
+static void
+oberon_with_statement(oberon_context_t * ctx)
+{
+	gen_label_t * end;
+	end = oberon_generator_reserve_label(ctx);
+
+	oberon_assert_token(ctx, WITH);
+	oberon_with_guard_do(ctx, end);
+	while(ctx -> token == BAR)
+	{
+		oberon_assert_token(ctx, BAR);
+		oberon_with_guard_do(ctx, end);
+	}
+
+	if(ctx -> token == ELSE)
+	{
+		oberon_assert_token(ctx, ELSE);
+		oberon_statement_seq(ctx);
+	}
+
+	oberon_generate_label(ctx, end);
+	oberon_assert_token(ctx, END);
+}
+
 static void
 oberon_statement(oberon_context_t * ctx)
 {
@@ -2877,6 +3406,200 @@ oberon_statement(oberon_context_t * ctx)
 			oberon_opt_proc_parens(ctx, item1);
 		}
 	}
+	else if(ctx -> token == IF)
+	{
+		gen_label_t * end;
+		gen_label_t * els;
+		oberon_expr_t * cond;
+
+		els = oberon_generator_reserve_label(ctx);
+		end = oberon_generator_reserve_label(ctx);
+
+		oberon_assert_token(ctx, IF);
+		cond = oberon_expr(ctx);
+		if(cond -> result -> class != OBERON_TYPE_BOOLEAN)
+		{
+			oberon_error(ctx, "condition must be boolean");
+		}
+		oberon_assert_token(ctx, THEN);
+		oberon_generate_branch(ctx, cond, false, els);
+		oberon_statement_seq(ctx);
+		oberon_generate_goto(ctx, end);
+		oberon_generate_label(ctx, els);
+
+		while(ctx -> token == ELSIF)
+		{
+			els = oberon_generator_reserve_label(ctx);
+
+			oberon_assert_token(ctx, ELSIF);
+			cond = oberon_expr(ctx);
+			if(cond -> result -> class != OBERON_TYPE_BOOLEAN)
+			{
+				oberon_error(ctx, "condition must be boolean");
+			}
+			oberon_assert_token(ctx, THEN);
+			oberon_generate_branch(ctx, cond, false, els);
+			oberon_statement_seq(ctx);
+			oberon_generate_goto(ctx, end);
+			oberon_generate_label(ctx, els);
+		}
+
+		if(ctx -> token == ELSE)
+		{
+			oberon_assert_token(ctx, ELSE);
+			oberon_statement_seq(ctx);
+		}
+
+		oberon_generate_label(ctx, end);
+		oberon_assert_token(ctx, END);		
+	}
+	else if(ctx -> token == WHILE)
+	{
+		gen_label_t * begin;
+		gen_label_t * end;
+		oberon_expr_t * cond;
+
+		begin = oberon_generator_reserve_label(ctx);
+		end = oberon_generator_reserve_label(ctx);
+
+		oberon_assert_token(ctx, WHILE);
+		oberon_generate_label(ctx, begin);
+		cond = oberon_expr(ctx);
+		if(cond -> result -> class != OBERON_TYPE_BOOLEAN)
+		{
+			oberon_error(ctx, "condition must be boolean");
+		}
+		oberon_generate_branch(ctx, cond, false, end);
+
+		oberon_assert_token(ctx, DO);
+		oberon_statement_seq(ctx);
+		oberon_generate_goto(ctx, begin);
+
+		oberon_assert_token(ctx, END);
+		oberon_generate_label(ctx, end);
+	}
+	else if(ctx -> token == REPEAT)
+	{
+		gen_label_t * begin;
+		oberon_expr_t * cond;
+
+		begin = oberon_generator_reserve_label(ctx);
+		oberon_generate_label(ctx, begin);
+		oberon_assert_token(ctx, REPEAT);
+
+		oberon_statement_seq(ctx);
+
+		oberon_assert_token(ctx, UNTIL);
+
+		cond = oberon_expr(ctx);
+		if(cond -> result -> class != OBERON_TYPE_BOOLEAN)
+		{
+			oberon_error(ctx, "condition must be boolean");
+		}
+
+		oberon_generate_branch(ctx, cond, true, begin);
+	}
+	else if(ctx -> token == FOR)
+	{
+		oberon_expr_t * from;
+		oberon_expr_t * index;
+		oberon_expr_t * to;
+		oberon_expr_t * bound;
+		oberon_expr_t * by;
+		oberon_expr_t * cond;
+		oberon_expr_t * count;
+		gen_label_t * begin;
+		gen_label_t * end;
+		char * iname;
+		int op;
+
+		begin = oberon_generator_reserve_label(ctx);
+		end = oberon_generator_reserve_label(ctx);
+
+		oberon_assert_token(ctx, FOR);
+		iname = oberon_assert_ident(ctx);
+		index = oberon_ident_item(ctx, iname);
+		oberon_assert_token(ctx, ASSIGN);
+		from = oberon_expr(ctx);
+		oberon_assign(ctx, from, index);
+		oberon_assert_token(ctx, TO);
+		bound = oberon_make_temp_var_item(ctx, index -> result);
+		to = oberon_expr(ctx);
+		oberon_assign(ctx, to, bound);
+		if(ctx -> token == BY)
+		{
+			oberon_assert_token(ctx, BY);
+			by = (oberon_expr_t *) oberon_const_expr(ctx);
+		}
+		else
+		{
+			by = oberon_integer_item(ctx, 1);
+		}
+
+		if(by -> result -> class != OBERON_TYPE_INTEGER)
+		{
+			oberon_error(ctx, "must be integer");
+		}
+
+		if(by -> item.integer > 0)
+		{
+			op = LEQ;
+		}
+		else if(by -> item.integer < 0)
+		{
+			op = GEQ;
+		}
+		else
+		{
+			oberon_error(ctx, "zero step not allowed");
+		}
+
+		oberon_assert_token(ctx, DO);
+		oberon_generate_label(ctx, begin);
+		cond = oberon_make_bin_op(ctx, op, index, bound);
+		oberon_generate_branch(ctx, cond, false, end);
+		oberon_statement_seq(ctx);
+		count = oberon_make_bin_op(ctx, PLUS, index, by);
+		oberon_assign(ctx, count, index);
+		oberon_generate_goto(ctx, begin);
+		oberon_generate_label(ctx, end);
+		oberon_assert_token(ctx, END);
+	}
+	else if(ctx -> token == LOOP)
+	{
+		gen_label_t * begin;
+		gen_label_t * end;
+
+		begin = oberon_generator_reserve_label(ctx);
+		end = oberon_generator_reserve_label(ctx);
+
+		oberon_open_scope(ctx);
+		oberon_assert_token(ctx, LOOP);
+		oberon_generate_label(ctx, begin);
+		ctx -> decl -> exit_label = end;
+		oberon_statement_seq(ctx);
+		oberon_generate_goto(ctx, begin);
+		oberon_generate_label(ctx, end);
+		oberon_assert_token(ctx, END);
+		oberon_close_scope(ctx -> decl);
+	}
+	else if(ctx -> token == EXIT)
+	{
+		oberon_assert_token(ctx, EXIT);
+		if(ctx -> decl -> exit_label == NULL)
+		{
+			oberon_error(ctx, "not in LOOP-END");
+		}
+		oberon_generate_goto(ctx, ctx -> decl -> exit_label);
+	}
+	else if(ctx -> token == CASE)
+	{
+		oberon_case_statement(ctx);
+	}
+	else if(ctx -> token == WITH)
+	{
+		oberon_with_statement(ctx);
+	}
 	else if(ctx -> token == RETURN)
 	{
 		oberon_assert_token(ctx, RETURN);
@@ -2998,7 +3721,7 @@ oberon_parse_module(oberon_context_t * ctx)
 
 	oberon_assert_token(ctx, END);
 	name2 = oberon_assert_ident(ctx);
-	oberon_assert_token(ctx, DOT);
+	oberon_expect_token(ctx, DOT);
 
 	if(strcmp(name1, name2) != 0)
 	{
@@ -3048,6 +3771,9 @@ register_default_types(oberon_context_t * ctx)
 
 	ctx -> char_type = oberon_new_type_char(1);
 	oberon_define_type(ctx -> world_scope, "CHAR", ctx -> char_type, 1);
+
+	ctx -> set_type = oberon_new_type_set(4);
+	oberon_define_type(ctx -> world_scope, "SET", ctx -> set_type, 1);
 }
 
 static void
@@ -3061,6 +3787,126 @@ oberon_new_intrinsic(oberon_context_t * ctx, char * name, GenerateFuncCallback f
 	proc -> type -> genproc = p;
 }
 
+static oberon_expr_t *
+oberon_make_min_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_args)
+{
+	if(num_args < 1)
+	{
+		oberon_error(ctx, "too few arguments");
+	}
+
+	if(num_args > 1)
+	{
+		oberon_error(ctx, "too mach arguments");
+	}
+
+	oberon_expr_t * arg;
+	arg = list_args;
+
+	if(!arg -> is_item || arg -> item.mode != MODE_TYPE)
+	{
+		oberon_error(ctx, "MIN accept only type");
+	}
+
+	oberon_expr_t * expr;
+	int bits = arg -> result -> size * 8;
+	switch(arg -> result -> class)
+	{
+		case OBERON_TYPE_INTEGER:
+			expr = oberon_integer_item(ctx, -powl(2, bits - 1));
+			break;
+		case OBERON_TYPE_SET:
+			expr = oberon_integer_item(ctx, 0);
+			break;
+		default:
+			oberon_error(ctx, "allowed only basic types");
+			break;
+	}
+
+	return expr;
+}
+
+static oberon_expr_t *
+oberon_make_max_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_args)
+{
+	if(num_args < 1)
+	{
+		oberon_error(ctx, "too few arguments");
+	}
+
+	if(num_args > 1)
+	{
+		oberon_error(ctx, "too mach arguments");
+	}
+
+	oberon_expr_t * arg;
+	arg = list_args;
+
+	if(!arg -> is_item || arg -> item.mode != MODE_TYPE)
+	{
+		oberon_error(ctx, "MAX accept only type");
+	}
+
+	oberon_expr_t * expr;
+	int bits = arg -> result -> size * 8;
+	switch(arg -> result -> class)
+	{
+		case OBERON_TYPE_INTEGER:
+			expr = oberon_integer_item(ctx, powl(2, bits - 1) - 1);
+			break;
+		case OBERON_TYPE_SET:
+			expr = oberon_integer_item(ctx, bits);
+			break;
+		default:
+			oberon_error(ctx, "allowed only basic types");
+			break;
+	}
+
+	return expr;
+}
+
+static oberon_expr_t *
+oberon_make_size_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_args)
+{
+	if(num_args < 1)
+	{
+		oberon_error(ctx, "too few arguments");
+	}
+
+	if(num_args > 1)
+	{
+		oberon_error(ctx, "too mach arguments");
+	}
+
+	oberon_expr_t * arg;
+	arg = list_args;
+
+	if(!arg -> is_item || arg -> item.mode != MODE_TYPE)
+	{
+		oberon_error(ctx, "SIZE accept only type");
+	}
+
+	int size;
+	oberon_expr_t * expr;
+	oberon_type_t * type = arg -> result;
+	switch(type -> class)
+	{
+		case OBERON_TYPE_INTEGER:
+		case OBERON_TYPE_BOOLEAN:
+		case OBERON_TYPE_REAL:
+		case OBERON_TYPE_CHAR:
+		case OBERON_TYPE_SET:
+			size = type -> size;
+			break;
+		default:
+			oberon_error(ctx, "TODO SIZE");
+			break;
+	}
+
+	expr = oberon_integer_item(ctx, size);
+	return expr;
+}
+
 static oberon_expr_t *
 oberon_make_abs_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_args)
 {
@@ -3076,6 +3922,7 @@ oberon_make_abs_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_
 
 	oberon_expr_t * arg;
 	arg = list_args;
+	oberon_check_src(ctx, arg);
 
 	oberon_type_t * result_type;
 	result_type = arg -> result;
@@ -3085,7 +3932,6 @@ oberon_make_abs_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_
 		oberon_error(ctx, "ABS accepts only integers");
 	}
 
-
 	oberon_expr_t * expr;
 	expr = oberon_new_operator(OP_ABS, result_type, arg, NULL);
 	return expr;
@@ -3099,8 +3945,10 @@ oberon_make_new_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_
 		oberon_error(ctx, "too few arguments");
 	}
 
+
 	oberon_expr_t * dst;
 	dst = list_args;
+	oberon_check_dst(ctx, dst);
 
 	oberon_type_t * type;
 	type = dst -> result;
@@ -3149,6 +3997,7 @@ oberon_make_new_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_
 		oberon_expr_t * arg = size_list;
 		for(int i = 0; i < max_args - 1; i++)
 		{
+			oberon_check_src(ctx, arg);
 			if(arg -> result -> class != OBERON_TYPE_INTEGER)
 			{
 				oberon_error(ctx, "size must be integer");
@@ -3172,6 +4021,15 @@ oberon_make_new_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_
 	oberon_assign(ctx, src, dst);
 }
 
+static void
+oberon_new_const(oberon_context_t * ctx, char * name, oberon_expr_t * expr)
+{
+	oberon_object_t * constant;
+	constant = oberon_define_object(ctx -> decl, name, OBERON_CLASS_CONST, true, false, false);
+	oberon_check_const(ctx, expr);
+	constant -> value = (oberon_item_t *) expr;
+}
+
 oberon_context_t *
 oberon_create_context(ModuleImportCallback import_module)
 {
@@ -3186,7 +4044,18 @@ oberon_create_context(ModuleImportCallback import_module)
 	oberon_generator_init_context(ctx);
 
 	register_default_types(ctx);
+
+	/* Constants */
+	oberon_new_const(ctx, "TRUE", oberon_make_boolean(ctx, true));
+	oberon_new_const(ctx, "FALSE", oberon_make_boolean(ctx, false));
+
+	/* Functions */
 	oberon_new_intrinsic(ctx, "ABS", oberon_make_abs_call, NULL);
+	oberon_new_intrinsic(ctx, "MIN", oberon_make_min_call, NULL);
+	oberon_new_intrinsic(ctx, "MAX", oberon_make_max_call, NULL);
+	oberon_new_intrinsic(ctx, "SIZE", oberon_make_size_call, NULL);
+
+	/* Procedures */
 	oberon_new_intrinsic(ctx, "NEW", NULL, oberon_make_new_call);
 
 	return ctx;