X-Git-Url: http://deadsoftware.ru/gitweb?a=blobdiff_plain;f=oberon.c;h=b0bb6aa6fa3ba13a60fe7f956fc8dc820d683501;hb=d3438ae51da4c98b47441911495f10e686191abd;hp=ac695d384bd17567d76620269a3ad02ac3929d57;hpb=2d029d2c2b27639e3a2b6c43e63788b00110818e;p=dsw-obn.git

diff --git a/oberon.c b/oberon.c
index ac695d3..b0bb6aa 100644
--- a/oberon.c
+++ b/oberon.c
@@ -286,6 +286,7 @@ oberon_find_var(oberon_scope_t * scope, char * name)
 }
 */
 
+/*
 static oberon_object_t *
 oberon_define_proc(oberon_scope_t * scope, char * name, oberon_type_t * signature)
 {
@@ -294,6 +295,7 @@ oberon_define_proc(oberon_scope_t * scope, char * name, oberon_type_t * signatur
 	proc -> type = signature;
 	return proc;
 }
+*/
 
 // =======================================================================
 //   SCANER
@@ -729,7 +731,7 @@ oberon_autocast_call(oberon_context_t * ctx, oberon_expr_t * desig)
 		oberon_error(ctx, "expected mode CALL");
 	}
 
-	if(desig -> item.var -> class != OBERON_CLASS_PROC)
+	if(desig -> item.var -> type -> class != OBERON_TYPE_PROCEDURE)
 	{
 		oberon_error(ctx, "only procedures can be called");
 	}
@@ -775,6 +777,108 @@ oberon_autocast_call(oberon_context_t * ctx, oberon_expr_t * desig)
 	}
 }
 
+static oberon_expr_t *
+oberon_make_call_func(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;
+	}
+
+	oberon_expr_t * call;
+
+	if(proc -> sysproc)
+	{
+		if(proc -> genfunc == NULL)
+		{
+			oberon_error(ctx, "not a function-procedure");
+		}
+
+		call = proc -> genfunc(ctx, num_args, list_args);
+	}
+	else
+	{
+		if(proc -> type -> base -> class == OBERON_TYPE_VOID)
+		{
+			oberon_error(ctx, "attempt to call procedure in expression");
+		}
+
+		call = oberon_new_item(MODE_CALL, proc -> type -> base);
+		call -> item.var = proc;
+		call -> item.num_args = num_args;
+		call -> item.args = list_args;
+		oberon_autocast_call(ctx, call);
+	}
+
+	return call;
+}
+
+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);
+		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) \
@@ -900,10 +1004,8 @@ 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);
-			break;
 		case OBERON_CLASS_PROC:
-			expr = oberon_new_item(MODE_CALL, var -> type);
+			expr = oberon_new_item(MODE_VAR, var -> type);
 			break;
 		default:
 			oberon_error(ctx, "invalid designator");
@@ -946,17 +1048,13 @@ oberon_designator(oberon_context_t * ctx)
 }
 
 static oberon_expr_t *
-oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
+oberon_opt_func_parens(oberon_context_t * ctx, oberon_expr_t * expr)
 {
 	assert(expr -> is_item == 1);
 
+	/* Если есть скобки - значит вызов. Если нет, то передаём указатель. */
 	if(ctx -> token == LPAREN)
 	{
-		if(expr -> result -> class != OBERON_TYPE_PROCEDURE)
-		{
-			oberon_error(ctx, "not a procedure");
-		}
-
 		oberon_assert_token(ctx, LPAREN);
 
 		int num_args = 0;
@@ -967,18 +1065,38 @@ oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
 			oberon_expr_list(ctx, &num_args, &arguments, 0);
 		}
 
-		expr -> result = expr -> item.var -> type -> base;
-		expr -> item.mode = MODE_CALL;
-		expr -> item.num_args = num_args;
-		expr -> item.args = arguments;
-		oberon_assert_token(ctx, RPAREN);
+		expr = oberon_make_call_func(ctx, expr -> item.var, num_args, arguments);
 
-		oberon_autocast_call(ctx, expr);
+		oberon_assert_token(ctx, RPAREN);
 	}
 
 	return expr;
 }
 
+static void
+oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
+{
+	assert(expr -> is_item == 1);
+
+	int num_args = 0;
+	oberon_expr_t * arguments = NULL;
+
+	if(ctx -> token == LPAREN)
+	{
+		oberon_assert_token(ctx, LPAREN);
+
+		if(ISEXPR(ctx -> token))
+		{
+			oberon_expr_list(ctx, &num_args, &arguments, 0);
+		}
+
+		oberon_assert_token(ctx, RPAREN);
+	}
+
+	/* Вызов происходит даже без скобок */
+	oberon_make_call_proc(ctx, expr -> item.var, num_args, arguments);
+}
+
 static oberon_expr_t *
 oberon_factor(oberon_context_t * ctx)
 {
@@ -988,7 +1106,7 @@ oberon_factor(oberon_context_t * ctx)
 	{
 		case IDENT:
 			expr = oberon_designator(ctx);
-			expr = oberon_opt_proc_parens(ctx, expr);
+			expr = oberon_opt_func_parens(ctx, expr);
 			break;
 		case INTEGER:
 			expr = oberon_new_item(MODE_INTEGER, ctx -> int_type);
@@ -1401,6 +1519,34 @@ oberon_opt_formal_pars(oberon_context_t * ctx, oberon_type_t ** type)
 	}
 }
 
+static void
+oberon_compare_signatures(oberon_context_t * ctx, oberon_type_t * a, oberon_type_t * b)
+{
+	if(a -> num_decl != b -> num_decl)
+	{
+		oberon_error(ctx, "number parameters not matched");
+	}
+
+	int num_param = a -> num_decl;
+	oberon_object_t * param_a = a -> decl;
+	oberon_object_t * param_b = b -> decl;
+	for(int i = 0; i < num_param; i++)
+	{
+		if(strcmp(param_a -> name, param_b -> name) != 0)
+		{
+			oberon_error(ctx, "param %i name not matched", i + 1);
+		}
+
+		if(param_a -> type != param_b -> type)
+		{
+			oberon_error(ctx, "param %i type not matched", i + 1);
+		}
+
+		param_a = param_a -> next;
+		param_b = param_b -> next;
+	}
+}
+
 static void
 oberon_make_return(oberon_context_t * ctx, oberon_expr_t * expr)
 {
@@ -1430,34 +1576,13 @@ oberon_make_return(oberon_context_t * ctx, oberon_expr_t * expr)
 }
 
 static void
-oberon_proc_decl(oberon_context_t * ctx)
+oberon_proc_decl_body(oberon_context_t * ctx, oberon_object_t * proc)
 {
-	oberon_assert_token(ctx, PROCEDURE);
-
-	char * name;
-	name = oberon_assert_ident(ctx);
-
-	oberon_scope_t * this_proc_def_scope = ctx -> decl;
-	oberon_open_scope(ctx);
-	ctx -> decl -> local = 1;
-
-	oberon_type_t * signature;
-	signature = oberon_new_type_ptr(OBERON_TYPE_VOID);
-	oberon_opt_formal_pars(ctx, &signature);
-
-	oberon_object_t * proc;
-	proc = oberon_define_proc(this_proc_def_scope, name, signature);
-
-	// процедура как новый родительский объект
-	ctx -> decl -> parent = proc;
-
-	oberon_initialize_decl(ctx);
-	oberon_generator_init_proc(ctx, proc);
-
 	oberon_assert_token(ctx, SEMICOLON);
 
+	ctx -> decl = proc -> scope;
+
 	oberon_decl_seq(ctx);
-	oberon_generator_init_type(ctx, signature);
 
 	oberon_generate_begin_proc(ctx, proc);
 
@@ -1468,13 +1593,14 @@ oberon_proc_decl(oberon_context_t * ctx)
 	}
 
 	oberon_assert_token(ctx, END);
-	char * name2 = oberon_assert_ident(ctx);
-	if(strcmp(name2, name) != 0)
+	char * name = oberon_assert_ident(ctx);
+	if(strcmp(name, proc -> name) != 0)
 	{
 		oberon_error(ctx, "procedure name not matched");
 	}
 
-	if(signature -> base -> class == OBERON_TYPE_VOID)
+	if(proc -> type -> base -> class == OBERON_TYPE_VOID
+		&& proc -> has_return == 0)
 	{
 		oberon_make_return(ctx, NULL);
 	}
@@ -1488,6 +1614,69 @@ oberon_proc_decl(oberon_context_t * ctx)
 	oberon_close_scope(ctx -> decl);
 }
 
+static void
+oberon_proc_decl(oberon_context_t * ctx)
+{
+	oberon_assert_token(ctx, PROCEDURE);
+
+	int forward = 0;
+	if(ctx -> token == UPARROW)
+	{
+		oberon_assert_token(ctx, UPARROW);
+		forward = 1;
+	}
+
+	char * name;
+	name = oberon_assert_ident(ctx);
+
+	oberon_scope_t * proc_scope;
+	proc_scope = oberon_open_scope(ctx);
+	ctx -> decl -> local = 1;
+
+	oberon_type_t * signature;
+	signature = oberon_new_type_ptr(OBERON_TYPE_VOID);
+	oberon_opt_formal_pars(ctx, &signature);	
+
+	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 -> class != OBERON_CLASS_PROC)
+		{
+			oberon_error(ctx, "mult definition");
+		}
+
+		if(forward == 0)
+		{
+			if(proc -> linked)
+			{
+				oberon_error(ctx, "mult procedure definition");
+			}
+		}
+
+		oberon_compare_signatures(ctx, proc -> type, signature);
+	}
+	else
+	{
+		proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC);
+		proc -> type = signature;
+		proc -> scope = proc_scope;
+		oberon_generator_init_proc(ctx, proc);
+	}
+
+	proc -> scope -> parent = proc;
+
+	if(forward == 0)
+	{
+		proc -> linked = 1;
+		oberon_proc_decl_body(ctx, proc);
+	}
+}
+
 static void
 oberon_const_decl(oberon_context_t * ctx)
 {
@@ -1975,6 +2164,24 @@ oberon_initialize_decl(oberon_context_t * ctx)
 	}	
 }
 
+static void
+oberon_prevent_undeclarated_procedures(oberon_context_t * ctx)
+{
+	oberon_object_t * x = ctx -> decl -> list;
+
+	while(x -> next)
+	{
+		if(x -> next -> class == OBERON_CLASS_PROC)
+		{
+			if(x -> next -> linked == 0)
+			{
+				oberon_error(ctx, "unresolved forward declaration");
+			}
+		}
+		x = x -> next;
+	}	
+}
+
 static void
 oberon_decl_seq(oberon_context_t * ctx)
 {
@@ -2016,6 +2223,8 @@ oberon_decl_seq(oberon_context_t * ctx)
 		oberon_proc_decl(ctx);
 		oberon_assert_token(ctx, SEMICOLON);
 	}
+
+	oberon_prevent_undeclarated_procedures(ctx);
 }
 
 static void
@@ -2025,21 +2234,6 @@ oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
 	oberon_generate_assign(ctx, src, dst);
 }
 
-static void
-oberon_make_call(oberon_context_t * ctx, oberon_expr_t * desig)
-{
-	if(desig -> result -> class != OBERON_TYPE_VOID)
-	{
-		if(desig -> result -> class != OBERON_TYPE_PROCEDURE)
-		{
-			oberon_error(ctx, "procedure with result");
-		}
-	}
-
-	oberon_autocast_call(ctx, desig);
-	oberon_generate_call_proc(ctx, desig);
-}
-
 static void
 oberon_statement(oberon_context_t * ctx)
 {
@@ -2057,8 +2251,7 @@ oberon_statement(oberon_context_t * ctx)
 		}
 		else
 		{
-			item1 = oberon_opt_proc_parens(ctx, item1);
-			oberon_make_call(ctx, item1);
+			oberon_opt_proc_parens(ctx, item1);
 		}
 	}
 	else if(ctx -> token == RETURN)
@@ -2140,6 +2333,58 @@ register_default_types(oberon_context_t * ctx)
 	oberon_define_type(ctx -> world_scope, "BOOLEAN", ctx -> bool_type);
 }
 
+static void
+oberon_new_intrinsic_function(oberon_context_t * ctx, char * name, GenerateFuncCallback generate)
+{
+	oberon_object_t * proc;
+	proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC);
+	proc -> sysproc = 1;
+	proc -> genfunc = generate;
+	proc -> type = oberon_new_type_ptr(OBERON_TYPE_PROCEDURE);
+}
+
+/*
+static void
+oberon_new_intrinsic_procedure(oberon_context_t * ctx, char * name, GenerateProcCallback generate)
+{
+	oberon_object_t * proc;
+	proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC);
+	proc -> sysproc = 1;
+	proc -> genproc = generate;
+	proc -> type = oberon_new_type_ptr(OBERON_TYPE_PROCEDURE);
+}
+*/
+
+static oberon_expr_t *
+oberon_make_abs_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;
+
+	oberon_type_t * result_type;
+	result_type = arg -> result;
+	
+	if(result_type -> class != OBERON_TYPE_INTEGER)
+	{
+		oberon_error(ctx, "ABS accepts only integers");
+	}
+
+
+	oberon_expr_t * expr;
+	expr = oberon_new_operator(OP_ABS, result_type, arg, NULL);
+	return expr;
+}
+
 oberon_context_t *
 oberon_create_context()
 {
@@ -2152,7 +2397,8 @@ oberon_create_context()
 
 	oberon_generator_init_context(ctx);
 
-	register_default_types(ctx);	
+	register_default_types(ctx);
+	oberon_new_intrinsic_function(ctx, "ABS", oberon_make_abs_call);
 
 	return ctx;
 }