X-Git-Url: http://deadsoftware.ru/gitweb?a=blobdiff_plain;f=oberon.c;h=e857b1d1ec6f93e454b5439cdcf81f96c150d167;hb=92fc7033b874920acf1b2f6e21bde51dcd0197f1;hp=5b4c4ea84efada1e388a0c775f4d363e16df49d8;hpb=3818049ca3679e8fcc432345d41a2d930f7874e4;p=dsw-obn.git

diff --git a/oberon.c b/oberon.c
index 5b4c4ea..e857b1d 100644
--- a/oberon.c
+++ b/oberon.c
@@ -155,42 +155,13 @@ oberon_define_object(oberon_scope_t * scope, char * name, int class, int export,
 	newvar -> read_only = read_only;
 	newvar -> local = scope -> local;
 	newvar -> parent = scope -> parent;
+	newvar -> module = scope -> ctx -> mod;
 
 	x -> next = newvar;
 
 	return newvar;
 }
 
-/*
-static void
-oberon_define_field(oberon_context_t * ctx, oberon_type_t * rec, char *  name, oberon_type_t * type)
-{
-	// TODO check base fields
-
-	oberon_object_t * x = rec -> decl;
-	while(x -> next && strcmp(x -> next -> name, name) != 0)
-	{
-		x = x -> next;
-	}
-
-	if(x -> next)
-	{
-		oberon_error(ctx, "multiple definition");
-	}
-
-	oberon_object_t * field = malloc(sizeof *field);
-	memset(field, 0, sizeof *field);
-	field -> name = name;
-	field -> class = OBERON_CLASS_FIELD;
-	field -> type = type;
-	field -> local = 1;
-	field -> parent = NULL;
-
-	rec -> num_decl += 1;
-	x -> next = field;
-}
-*/
-
 static oberon_object_t *
 oberon_find_object_in_list(oberon_object_t * list, char * name)
 {
@@ -257,8 +228,11 @@ oberon_define_type(oberon_scope_t * scope, char * name, oberon_type_t * type, in
 static void
 oberon_get_char(oberon_context_t * ctx)
 {
-	ctx -> code_index += 1;
-	ctx -> c = ctx -> code[ctx -> code_index];
+	if(ctx -> code[ctx -> code_index])
+	{
+		ctx -> code_index += 1;
+		ctx -> c = ctx -> code[ctx -> code_index];
+	}
 }
 
 static void
@@ -408,6 +382,43 @@ oberon_skip_space(oberon_context_t * ctx)
 	}
 }
 
+static void
+oberon_read_comment(oberon_context_t * ctx)
+{
+	int nesting = 1;
+	while(nesting >= 1)
+	{
+		if(ctx -> c == '(')
+		{
+			oberon_get_char(ctx);
+			if(ctx -> c == '*')
+			{
+				oberon_get_char(ctx);
+				nesting += 1;
+			}
+		}
+		else if(ctx -> c == '*')
+		{
+			oberon_get_char(ctx);
+			if(ctx -> c == ')')
+			{
+				oberon_get_char(ctx);
+				nesting -= 1;
+			}
+		}
+		else if(ctx -> c == 0)
+		{
+			oberon_error(ctx, "unterminated comment");
+		}
+		else
+		{
+			oberon_get_char(ctx);
+		}
+	}
+}
+
+static void oberon_read_token(oberon_context_t * ctx);
+
 static void
 oberon_read_symbol(oberon_context_t * ctx)
 {
@@ -437,6 +448,12 @@ oberon_read_symbol(oberon_context_t * ctx)
 		case '(':
 			ctx -> token = LPAREN;
 			oberon_get_char(ctx);
+			if(ctx -> c == '*')
+			{
+				oberon_get_char(ctx);
+				oberon_read_comment(ctx);
+				oberon_read_token(ctx);
+			}
 			break;
 		case ')':
 			ctx -> token = RPAREN;
@@ -479,6 +496,11 @@ oberon_read_symbol(oberon_context_t * ctx)
 		case '*':
 			ctx -> token = STAR;
 			oberon_get_char(ctx);
+			if(ctx -> c == ')')
+			{
+				oberon_get_char(ctx);
+				oberon_error(ctx, "unstarted comment");
+			}
 			break;
 		case '/':
 			ctx -> token = SLASH;
@@ -509,7 +531,7 @@ oberon_read_symbol(oberon_context_t * ctx)
 			oberon_get_char(ctx);
 			break;
 		default:
-			oberon_error(ctx, "invalid char");
+			oberon_error(ctx, "invalid char %c", ctx -> c);
 			break;
 	}
 }
@@ -554,6 +576,7 @@ oberon_new_operator(int op, oberon_type_t * result, oberon_expr_t * left, oberon
 
 	operator -> is_item = 0;
 	operator -> result = result;
+	operator -> read_only = 1;
 	operator -> op = op;
 	operator -> left = left;
 	operator -> right = right;
@@ -562,7 +585,7 @@ oberon_new_operator(int op, oberon_type_t * result, oberon_expr_t * left, oberon
 }
 
 static oberon_expr_t *
-oberon_new_item(int mode, oberon_type_t * result)
+oberon_new_item(int mode, oberon_type_t * result, int read_only)
 {
 	oberon_item_t * item;
         item = malloc(sizeof *item);
@@ -570,6 +593,7 @@ oberon_new_item(int mode, oberon_type_t * result)
 
 	item -> is_item = 1;
 	item -> result = result;
+	item -> read_only = read_only;
 	item -> mode = mode;
 
 	return (oberon_expr_t *)item;
@@ -776,7 +800,7 @@ oberon_make_call_func(oberon_context_t * ctx, oberon_object_t * proc, int num_ar
 			oberon_error(ctx, "attempt to call procedure in expression");
 		}
 
-		call = oberon_new_item(MODE_CALL, proc -> type -> base);
+		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;
@@ -827,7 +851,7 @@ oberon_make_call_proc(oberon_context_t * ctx, oberon_object_t * proc, int num_ar
 		}
 
 		oberon_expr_t * call;
-		call = oberon_new_item(MODE_CALL, proc -> type -> base);
+		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;
@@ -857,7 +881,7 @@ oberno_make_dereferencing(oberon_context_t * ctx, oberon_expr_t * expr)
 	assert(expr -> is_item);
 
 	oberon_expr_t * selector;
-	selector = oberon_new_item(MODE_DEREF, expr -> result -> base);
+	selector = oberon_new_item(MODE_DEREF, expr -> result -> base, expr -> read_only);
 	selector -> item.parent = (oberon_item_t *) expr;
 
 	return selector;
@@ -901,7 +925,7 @@ oberon_make_array_selector(oberon_context_t * ctx, oberon_expr_t * desig, oberon
 	}
 
 	oberon_expr_t * selector;
-	selector = oberon_new_item(MODE_INDEX, base);
+	selector = oberon_new_item(MODE_INDEX, base, desig -> read_only);
 	selector -> item.parent = (oberon_item_t *) desig;
 	selector -> item.num_args = 1;
 	selector -> item.args = index;
@@ -929,8 +953,25 @@ oberon_make_record_selector(oberon_context_t * ctx, oberon_expr_t * expr, char *
 	oberon_object_t * field;
 	field = oberon_find_field(ctx, rec, name);
 
+	if(field -> export == 0)
+	{
+		if(field -> module != ctx -> mod)
+		{
+			oberon_error(ctx, "field not exported");
+		}
+	}
+
+	int read_only = 0;
+	if(field -> read_only)
+	{
+		if(field -> module != ctx -> mod)
+		{
+			read_only = 1;
+		}
+	}
+
 	oberon_expr_t * selector;
-	selector = oberon_new_item(MODE_FIELD, field -> type);
+	selector = oberon_new_item(MODE_FIELD, field -> type, read_only);
 	selector -> item.var = field;
 	selector -> item.parent = (oberon_item_t *) expr;
 
@@ -984,6 +1025,15 @@ oberon_designator(oberon_context_t * ctx)
 
 	var = oberon_qualident(ctx, NULL, 1);
 
+	int read_only = 0;
+	if(var -> read_only)
+	{
+		if(var -> module != ctx -> mod)
+		{
+			read_only = 1;
+		}
+	}
+
 	switch(var -> class)
 	{
 		case OBERON_CLASS_CONST:
@@ -993,8 +1043,10 @@ oberon_designator(oberon_context_t * ctx)
 		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);
+			expr = oberon_new_item(MODE_VAR, var -> type, 1);
 			break;
 		default:
 			oberon_error(ctx, "invalid designator");
@@ -1098,17 +1150,17 @@ oberon_factor(oberon_context_t * ctx)
 			expr = oberon_opt_func_parens(ctx, expr);
 			break;
 		case INTEGER:
-			expr = oberon_new_item(MODE_INTEGER, ctx -> int_type);
+			expr = oberon_new_item(MODE_INTEGER, ctx -> int_type, 1);
 			expr -> item.integer = ctx -> integer;
 			oberon_assert_token(ctx, INTEGER);
 			break;
 		case TRUE:
-			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type);
+			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, 1);
 			expr -> item.boolean = 1;
 			oberon_assert_token(ctx, TRUE);
 			break;
 		case FALSE:
-			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type);
+			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, 1);
 			expr -> item.boolean = 0;
 			oberon_assert_token(ctx, FALSE);
 			break;
@@ -1124,7 +1176,7 @@ oberon_factor(oberon_context_t * ctx)
 			break;
 		case NIL:
 			oberon_assert_token(ctx, NIL);
-			expr = oberon_new_item(MODE_NIL, ctx -> void_ptr_type);
+			expr = oberon_new_item(MODE_NIL, ctx -> void_ptr_type, 1);
 			break;
 		default:
 			oberon_error(ctx, "invalid expression");
@@ -2294,6 +2346,11 @@ oberon_decl_seq(oberon_context_t * ctx)
 static void
 oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
 {
+	if(dst -> read_only)
+	{
+		oberon_error(ctx, "read-only destination");
+	}
+
 	oberon_autocast_to(ctx, src, dst -> result);
 	oberon_generate_assign(ctx, src, dst);
 }
@@ -2420,17 +2477,11 @@ oberon_parse_module(oberon_context_t * ctx)
 	oberon_assert_token(ctx, SEMICOLON);
 	ctx -> mod -> name = name1;
 
-	oberon_object_t * this_module;
-	this_module = oberon_define_object(ctx -> decl, name1, OBERON_CLASS_MODULE, 0, 0);
-	this_module -> module = ctx -> mod;
-
 	if(ctx -> token == IMPORT)
 	{
 		oberon_import_list(ctx);
 	}
 
-	ctx -> decl -> parent = this_module;
-
 	oberon_decl_seq(ctx);
 
 	oberon_generate_begin_module(ctx);