X-Git-Url: http://deadsoftware.ru/gitweb?a=blobdiff_plain;f=src%2Foberon.c;h=6a74f92c0aad16f6a3b13a6053e3e5b58e145fcc;hb=b224b07b1d47fd3ae165d652be4a9a3a10d52181;hp=09a6b8850c988e64986859aa3f2a73e3cd17d2ae;hpb=351f950548241d4c4bd799acabbcd98a39b096cc;p=dsw-obn.git

diff --git a/src/oberon.c b/src/oberon.c
index 09a6b88..6a74f92 100644
--- a/src/oberon.c
+++ b/src/oberon.c
@@ -64,7 +64,7 @@ enum {
 //   UTILS
 // ======================================================================= 
 
-void
+static void
 oberon_error(oberon_context_t * ctx, const char * fmt, ...)
 {
 	va_list ptr;
@@ -98,11 +98,10 @@ oberon_new_type_integer(int size)
 }
 
 static oberon_type_t *
-oberon_new_type_boolean(int size)
+oberon_new_type_boolean()
 {
 	oberon_type_t * x;
 	x = oberon_new_type_ptr(OBERON_TYPE_BOOLEAN);
-	x -> size = size;
 	return x;
 }
 
@@ -446,10 +445,12 @@ oberon_read_number(oberon_context_t * ctx)
 	memcpy(ident, &ctx -> code[start_i], len);
 	ident[len] = 0;
 
+	ctx -> longmode = false;
 	if(mode == 3)
 	{
 		int i = exp_i - start_i;
 		ident[i] = 'E';
+		ctx -> longmode = true;
 	}
 
 	switch(mode)
@@ -766,26 +767,87 @@ oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first,
 	}
 }
 
+static oberon_expr_t *
+oberon_cast_expr(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t * pref)
+{
+	oberon_expr_t * cast;
+	cast = oberon_new_item(MODE_CAST, pref, expr -> read_only);
+	cast -> item.parent = expr;
+	cast -> next = expr -> next;
+	return cast;
+}
+
+static oberon_type_t *
+oberon_get_equal_expr_type(oberon_context_t * ctx, oberon_type_t * a, oberon_type_t * b)
+{
+	oberon_type_t * result;
+	if(a -> class == OBERON_TYPE_REAL && b -> class == OBERON_TYPE_INTEGER)
+	{
+		result = a;
+	}
+	else if(b -> class == OBERON_TYPE_REAL && a -> class == OBERON_TYPE_INTEGER)
+	{
+		result = b;
+	}
+	else if(a -> class != b -> class)
+	{
+		oberon_error(ctx, "oberon_get_equal_expr_type: incompatible types");
+	}
+	else if(a -> size > b -> size)
+	{
+		result = a;
+	}
+	else
+	{
+		result = b;
+	}
+
+	return result;
+}
+
 static oberon_expr_t *
 oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t * pref)
 {
 	if(pref -> class != expr -> result -> class)
 	{
-		if(pref -> class != OBERON_TYPE_PROCEDURE)
+		if(pref -> class == OBERON_TYPE_POINTER)
 		{
-			if(expr -> result -> class != OBERON_TYPE_POINTER)
+			if(expr -> result -> class == OBERON_TYPE_POINTER)
+			{
+				// accept
+			}
+			else
 			{
 				oberon_error(ctx, "incompatible types");
 			}
 		}
+		else if(pref -> class == OBERON_TYPE_REAL)
+		{
+			if(expr -> result -> class == OBERON_TYPE_INTEGER)
+			{
+				// accept
+			}
+			else
+			{
+				oberon_error(ctx, "incompatible types");
+			}
+		}
+		else
+		{
+			oberon_error(ctx, "incompatible types");
+		}
 	}
 
-	if(pref -> class == OBERON_TYPE_INTEGER)
+	if(pref -> class == OBERON_TYPE_INTEGER || pref -> class == OBERON_TYPE_REAL)
 	{
-		if(expr -> result -> class > pref -> class)
+		if(expr -> result -> size > pref -> size)
 		{
 			oberon_error(ctx, "incompatible size");
 		}
+		else
+		{
+			expr = oberon_cast_expr(ctx, expr, pref);
+		}
 	}
 	else if(pref -> class == OBERON_TYPE_RECORD)
 	{
@@ -806,11 +868,19 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
 		}
 	}
 
-	// TODO cast
-
 	return expr;
 }
 
+static void
+oberon_autocast_binary_op(oberon_context_t * ctx, oberon_expr_t ** ea, oberon_expr_t ** eb)
+{
+	oberon_type_t * a = (*ea) -> result;
+	oberon_type_t * b = (*eb) -> result;
+	oberon_type_t * preq = oberon_get_equal_expr_type(ctx, a, b);
+	*ea = oberon_autocast_to(ctx, *ea, preq);
+	*eb = oberon_autocast_to(ctx, *eb, preq);
+}
+
 static void
 oberon_autocast_call(oberon_context_t * ctx, oberon_expr_t * desig)
 {
@@ -842,6 +912,8 @@ oberon_autocast_call(oberon_context_t * ctx, oberon_expr_t * desig)
 		oberon_error(ctx, "too many arguments");
 	}
 
+	/* Делаем проверку на запись и делаем автокаст */
+	oberon_expr_t * casted[num_args];
 	oberon_expr_t * arg = desig -> item.args;
 	oberon_object_t * param = fn -> decl;
 	for(int i = 0; i < num_args; i++)
@@ -852,27 +924,23 @@ oberon_autocast_call(oberon_context_t * ctx, oberon_expr_t * desig)
 			{
 				oberon_error(ctx, "assign to read-only var");
 			}
+		}
 
-			//if(arg -> is_item)
-			//{
-			//	switch(arg -> item.mode)
-			//	{
-			//		case MODE_VAR:
-			//		case MODE_INDEX:
-			//		case MODE_FIELD:
-			//		// Допустимо разыменование?
-			//		//case MODE_DEREF:
-			//			break;
-			//		default:
-			//			oberon_error(ctx, "var-parameter accept only variables");
-			//			break;
-			//	}
-			//}
-		}
-		oberon_autocast_to(ctx, arg, param -> type);
+		casted[i] = oberon_autocast_to(ctx, arg, param -> type);
 		arg = arg -> next;
 		param = param -> next;
 	}
+
+	/* Создаём новый список выражений */
+	if(num_args > 0)
+	{
+		arg = casted[0];
+		for(int i = 0; i < num_args - 1; i++)
+		{
+			casted[i] -> next = casted[i + 1];
+		}
+		desig -> item.args = arg;
+	}
 }
 
 static oberon_expr_t *
@@ -999,7 +1067,7 @@ oberno_make_dereferencing(oberon_context_t * ctx, oberon_expr_t * expr)
 
 	oberon_expr_t * selector;
 	selector = oberon_new_item(MODE_DEREF, expr -> result -> base, expr -> read_only);
-	selector -> item.parent = (oberon_item_t *) expr;
+	selector -> item.parent = expr;
 
 	return selector;
 }
@@ -1046,7 +1114,7 @@ oberon_make_array_selector(oberon_context_t * ctx, oberon_expr_t * desig, oberon
 
 	oberon_expr_t * selector;
 	selector = oberon_new_item(MODE_INDEX, base, desig -> read_only);
-	selector -> item.parent = (oberon_item_t *) desig;
+	selector -> item.parent = desig;
 	selector -> item.num_args = 1;
 	selector -> item.args = index;
 
@@ -1093,7 +1161,7 @@ oberon_make_record_selector(oberon_context_t * ctx, oberon_expr_t * expr, char *
 	oberon_expr_t * selector;
 	selector = oberon_new_item(MODE_FIELD, field -> type, read_only);
 	selector -> item.var = field;
-	selector -> item.parent = (oberon_item_t *) expr;
+	selector -> item.parent = expr;
 
 	return selector;
 }
@@ -1258,10 +1326,32 @@ oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
 	oberon_make_call_proc(ctx, expr -> item.var, num_args, arguments);
 }
 
+static oberon_type_t *
+oberon_get_type_of_int_value(oberon_context_t * ctx, int64_t i)
+{
+	if(i >= -128 && i <= 127)
+	{
+		return ctx -> byte_type;
+	}
+	else if(i >= -32768 && i <= 32767)
+	{
+		return ctx -> shortint_type;
+	}
+	else if(i >= -2147483648 && i <= 2147483647)
+	{
+		 return ctx -> int_type;
+	}
+	else
+	{
+		return ctx -> longint_type;
+	}
+}
+
 static oberon_expr_t *
 oberon_factor(oberon_context_t * ctx)
 {
 	oberon_expr_t * expr;
+	oberon_type_t * result;
 
 	switch(ctx -> token)
 	{
@@ -1270,23 +1360,25 @@ 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, 1);
+			result = oberon_get_type_of_int_value(ctx, ctx -> integer);
+			expr = oberon_new_item(MODE_INTEGER, result, 1);
 			expr -> item.integer = ctx -> integer;
 			oberon_assert_token(ctx, INTEGER);
 			break;
 		case REAL:
-			expr = oberon_new_item(MODE_REAL, ctx -> real_type, 1);
+			result = (ctx -> longmode) ? (ctx -> longreal_type) : (ctx -> real_type);
+			expr = oberon_new_item(MODE_REAL, result, 1);
 			expr -> item.real = ctx -> real;
 			oberon_assert_token(ctx, REAL);
 			break;
 		case TRUE:
 			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, 1);
-			expr -> item.boolean = 1;
+			expr -> item.boolean = true;
 			oberon_assert_token(ctx, TRUE);
 			break;
 		case FALSE:
 			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, 1);
-			expr -> item.boolean = 0;
+			expr -> item.boolean = false;
 			oberon_assert_token(ctx, FALSE);
 			break;
 		case LPAREN:
@@ -1310,41 +1402,6 @@ oberon_factor(oberon_context_t * ctx)
 	return expr;
 }
 
-/*
- * oberon_autocast_binary_op автоматически переобразовывеат тип по след. правилам:
- *   1. Классы обоих типов должны быть одинаковы
- *   2. В качестве результата должен быть выбран больший тип.
- *   3. Если размер результат не должен быть меньше чем базовый int
- */
-
-static void
-oberon_autocast_binary_op(oberon_context_t * ctx, oberon_type_t * a, oberon_type_t * b, oberon_type_t ** result)
-{
-	if((a -> class) != (b -> class))
-	{
-		oberon_error(ctx, "incompatible types");
-	}
-
-	if((a -> size) > (b -> size))
-	{
-		*result = a;
-	}
-	else
-	{
-		*result = b;
-	}
-
-	if(((*result) -> class) == OBERON_TYPE_INTEGER)
-	{
-		if(((*result) -> size) < (ctx -> int_type -> size))
-		{
-			*result = ctx -> int_type;
-		}
-	}
-
-	/* TODO: cast types */
-}
-
 #define ITMAKESBOOLEAN(x) \
 	(((x) >= EQUAL && (x) <= GEQ) || ((x) == OR) || ((x) == AND))
 
@@ -1354,6 +1411,27 @@ oberon_autocast_binary_op(oberon_context_t * ctx, oberon_type_t * a, oberon_type
 #define ITUSEONLYBOOLEAN(x) \
 	(((x) == OR) || ((x) == AND))
 
+static void
+oberon_autocast_to_real(oberon_context_t * ctx, oberon_expr_t ** e)
+{
+	oberon_expr_t * expr = *e;
+	if(expr -> result -> class == OBERON_TYPE_INTEGER)
+	{
+		if(expr -> result -> size <= ctx -> real_type -> size)
+		{
+			*e = oberon_cast_expr(ctx, expr, ctx -> real_type);
+		}
+		else
+		{
+			*e = oberon_cast_expr(ctx, expr, ctx -> longreal_type);
+		}
+	}
+	else if(expr -> result -> class != OBERON_TYPE_REAL)
+	{
+		oberon_error(ctx, "required numeric type");
+	}
+}
+
 static oberon_expr_t *
 oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_expr_t * b)
 {
@@ -1364,10 +1442,12 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
 	{
 		if(ITUSEONLYINTEGER(token))
 		{
-			if(a -> result -> class != OBERON_TYPE_INTEGER
-				|| b -> result -> class != OBERON_TYPE_INTEGER)
+			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)
 			{
-				oberon_error(ctx, "used only with integer types");
+				oberon_error(ctx, "used only with numeric types");
 			}
 		}
 		else if(ITUSEONLYBOOLEAN(token))
@@ -1379,6 +1459,7 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
 			}
 		}
 
+		oberon_autocast_binary_op(ctx, &a, &b);
 		result = ctx -> bool_type;
 
 		if(token == EQUAL)
@@ -1420,32 +1501,10 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
 	}
 	else if(token == SLASH)
 	{
-		if(a -> result -> class != OBERON_TYPE_REAL)
-		{
-			if(a -> result -> class == OBERON_TYPE_INTEGER)
-			{
-				oberon_error(ctx, "TODO cast int -> real");
-			}
-			else
-			{
-				oberon_error(ctx, "operator / requires numeric type");
-			}
-		}
-
-		if(b -> result -> class != OBERON_TYPE_REAL)
-		{
-			if(b -> result -> class == OBERON_TYPE_INTEGER)
-			{
-				oberon_error(ctx, "TODO cast int -> real");
-			}
-			else
-			{
-				oberon_error(ctx, "operator / requires numeric type");
-			}
-		}
-
-		oberon_autocast_binary_op(ctx, a -> result, b -> result, &result);
-		expr = oberon_new_operator(OP_DIV, result, a, b);
+		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);
 	}
 	else if(token == DIV)
 	{
@@ -1455,28 +1514,28 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
 			oberon_error(ctx, "operator DIV requires integer type");
 		}
 
-		oberon_autocast_binary_op(ctx, a -> result, b -> result, &result);
-		expr = oberon_new_operator(OP_DIV, result, a, b);
+		oberon_autocast_binary_op(ctx, &a, &b);
+		expr = oberon_new_operator(OP_DIV, a -> result, a, b);
 	}
 	else
 	{
-		oberon_autocast_binary_op(ctx, a -> result, b -> result, &result);
+		oberon_autocast_binary_op(ctx, &a, &b);
 
 		if(token == PLUS)
 		{
-			expr = oberon_new_operator(OP_ADD, result, a, b);
+			expr = oberon_new_operator(OP_ADD, a -> result, a, b);
 		}
 		else if(token == MINUS)
 		{
-			expr = oberon_new_operator(OP_SUB, result, a, b);
+			expr = oberon_new_operator(OP_SUB, a -> result, a, b);
 		}
 		else if(token == STAR)
 		{
-			expr = oberon_new_operator(OP_MUL, result, a, b);
+			expr = oberon_new_operator(OP_MUL, a -> result, a, b);
 		}
 		else if(token == MOD)
 		{
-			expr = oberon_new_operator(OP_MOD, result, a, b);
+			expr = oberon_new_operator(OP_MOD, a -> result, a, b);
 		}
 		else
 		{
@@ -1814,7 +1873,7 @@ oberon_make_return(oberon_context_t * ctx, oberon_expr_t * expr)
 			oberon_error(ctx, "procedure requires expression on result");
 		}
 
-		oberon_autocast_to(ctx, expr, result_type);
+		expr = oberon_autocast_to(ctx, expr, result_type);
 	}
 
 	proc -> has_return = 1;
@@ -2201,7 +2260,8 @@ oberon_prevent_recursive_pointer(oberon_context_t * ctx, oberon_type_t * type)
 		oberon_error(ctx, "recursive pointer declaration");
 	}
 
-	if(type -> base -> class == OBERON_TYPE_POINTER)
+	if(type -> class == OBERON_TYPE_POINTER
+		&& type -> base -> class == OBERON_TYPE_POINTER)
 	{
 		oberon_error(ctx, "attempt to make pointer to pointer");
 	}
@@ -2550,7 +2610,7 @@ oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
 		oberon_error(ctx, "read-only destination");
 	}
 
-	oberon_autocast_to(ctx, src, dst -> result);
+	src = oberon_autocast_to(ctx, src, dst -> result);
 	oberon_generate_assign(ctx, src, dst);
 }
 
@@ -2701,6 +2761,8 @@ oberon_parse_module(oberon_context_t * ctx)
 	{
 		oberon_error(ctx, "module name not matched");
 	}
+
+	oberon_generator_fini_module(ctx -> mod);
 }
 
 // =======================================================================
@@ -2717,14 +2779,26 @@ register_default_types(oberon_context_t * ctx)
 	ctx -> void_ptr_type -> base = ctx -> void_type;
 	oberon_generator_init_type(ctx, ctx -> void_ptr_type);
 
-	ctx -> int_type = oberon_new_type_integer(sizeof(int));
+	ctx -> bool_type = oberon_new_type_boolean();
+	oberon_define_type(ctx -> world_scope, "BOOLEAN", ctx -> bool_type, 1);
+
+	ctx -> byte_type = oberon_new_type_integer(1);
+	oberon_define_type(ctx -> world_scope, "BYTE", ctx -> byte_type, 1);
+
+	ctx -> shortint_type = oberon_new_type_integer(2);
+	oberon_define_type(ctx -> world_scope, "SHORTINT", ctx -> shortint_type, 1);
+
+	ctx -> int_type = oberon_new_type_integer(4);
 	oberon_define_type(ctx -> world_scope, "INTEGER", ctx -> int_type, 1);
 
-	ctx -> bool_type = oberon_new_type_boolean(sizeof(bool));
-	oberon_define_type(ctx -> world_scope, "BOOLEAN", ctx -> bool_type, 1);
+	ctx -> longint_type = oberon_new_type_integer(8);
+	oberon_define_type(ctx -> world_scope, "LONGINT", ctx -> longint_type, 1);
 
-	ctx -> real_type = oberon_new_type_real(sizeof(float));
+	ctx -> real_type = oberon_new_type_real(4);
 	oberon_define_type(ctx -> world_scope, "REAL", ctx -> real_type, 1);
+
+	ctx -> longreal_type = oberon_new_type_real(8);
+	oberon_define_type(ctx -> world_scope, "LONGREAL", ctx -> longreal_type, 1);
 }
 
 static void
@@ -2885,6 +2959,8 @@ oberon_compile_module(oberon_context_t * ctx, const char * newcode)
 	int token = ctx -> token;
 	char * string = ctx -> string;
 	int integer = ctx -> integer;
+	int real = ctx -> real;
+	bool longmode = ctx -> longmode;
 	oberon_scope_t * decl = ctx -> decl;
 	oberon_module_t * mod = ctx -> mod;
 
@@ -2910,6 +2986,8 @@ oberon_compile_module(oberon_context_t * ctx, const char * newcode)
 	ctx -> token = token;
 	ctx -> string = string;
 	ctx -> integer = integer;
+	ctx -> real = real;
+	ctx -> longmode = longmode;
 	ctx -> decl = decl;
 	ctx -> mod = mod;