X-Git-Url: https://deadsoftware.ru/gitweb?a=blobdiff_plain;f=src%2Foberon.c;h=f50f4d300246b4beed4fd6e58afaf21cb307cf3a;hb=99fa357db44a4c30957bd0810e14a20456c58347;hp=e755b6cf625c2984edd3ef2dd8655810426fd44e;hpb=e6a70a3b694efa5600cfcd0d8110f8d9e8866342;p=dsw-obn.git

diff --git a/src/oberon.c b/src/oberon.c
index e755b6c..f50f4d3 100644
--- a/src/oberon.c
+++ b/src/oberon.c
@@ -59,7 +59,19 @@ enum {
 	UPARROW,
 	NIL,
 	IMPORT,
-	REAL
+	REAL,
+	CHAR,
+	STRING,
+	IF,
+	THEN,
+	ELSE,
+	ELSIF,
+	WHILE,
+	DO,
+	REPEAT,
+	UNTIL,
+	FOR,
+	BY
 };
 
 // =======================================================================
@@ -116,6 +128,24 @@ oberon_new_type_real(int size)
 	return x;
 }
 
+static oberon_type_t *
+oberon_new_type_char(int size)
+{
+	oberon_type_t * x;
+	x = oberon_new_type_ptr(OBERON_TYPE_CHAR);
+	x -> size = size;
+	return x;
+}
+
+static oberon_type_t *
+oberon_new_type_string(int size)
+{
+	oberon_type_t * x;
+	x = oberon_new_type_ptr(OBERON_TYPE_STRING);
+	x -> size = size;
+	return x;
+}
+
 // =======================================================================
 //   TABLE
 // ======================================================================= 
@@ -179,6 +209,22 @@ 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)
 {
@@ -201,17 +247,8 @@ 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;
@@ -360,6 +397,46 @@ 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;
+	}
 }
 
 static void
@@ -377,6 +454,7 @@ oberon_read_number(oberon_context_t * ctx)
 	 * mode = 1 == HEX
 	 * mode = 2 == REAL
 	 * mode = 3 == LONGREAL
+	 * mode = 4 == CHAR
 	 */
 	int mode = 0;
 	start_i = ctx -> code_index;
@@ -398,11 +476,20 @@ oberon_read_number(oberon_context_t * ctx)
 
 		end_i = ctx -> code_index;
 
-		if(ctx -> c != 'H')
+		if(ctx -> c == 'H')
+		{
+			mode = 1;
+			oberon_get_char(ctx);
+		}
+		else if(ctx -> c == 'X')
+		{
+			mode = 4;
+			oberon_get_char(ctx);
+		}
+		else
 		{
 			oberon_error(ctx, "invalid hex number");
 		}
-		oberon_get_char(ctx);
 	}
 	else if(ctx -> c == '.')
 	{
@@ -440,6 +527,20 @@ oberon_read_number(oberon_context_t * ctx)
 		end_i = ctx -> code_index;
 	}
 
+	if(mode == 0)
+	{
+		if(ctx -> c == 'H')
+		{
+			mode = 1;
+			oberon_get_char(ctx);
+		}
+		else if(ctx -> c == 'X')
+		{
+			mode = 4;
+			oberon_get_char(ctx);
+		}
+	}
+
 	int len = end_i - start_i;
 	ident = malloc(len + 1);
 	memcpy(ident, &ctx -> code[start_i], len);
@@ -470,6 +571,11 @@ oberon_read_number(oberon_context_t * ctx)
 			sscanf(ident, "%lf", &real);
 			ctx -> token = REAL;
 			break;
+		case 4:
+			sscanf(ident, "%lx", &integer);
+			real = integer;
+			ctx -> token = CHAR;
+			break;
 		default:
 			oberon_error(ctx, "oberon_read_number: wat");
 			break;
@@ -524,6 +630,36 @@ oberon_read_comment(oberon_context_t * ctx)
 	}
 }
 
+static void oberon_read_string(oberon_context_t * ctx)
+{
+	int c = ctx -> c;
+	oberon_get_char(ctx);
+
+	int start = ctx -> code_index;
+
+	while(ctx -> c != 0 && ctx -> c != c)
+	{
+		oberon_get_char(ctx);
+	}
+
+	if(ctx -> c == 0)
+	{
+		oberon_error(ctx, "unterminated string");
+	}
+
+	int end = ctx -> code_index;
+
+	oberon_get_char(ctx);
+
+	char * string = calloc(1, end - start + 1);
+	strncpy(string, &ctx -> code[start], end - start);
+
+	ctx -> token = STRING;
+	ctx -> string = string;
+
+	printf("oberon_read_string: string ((%s))\n", string);
+}
+
 static void oberon_read_token(oberon_context_t * ctx);
 
 static void
@@ -637,6 +773,12 @@ oberon_read_symbol(oberon_context_t * ctx)
 			ctx -> token = UPARROW;
 			oberon_get_char(ctx);
 			break;
+		case '"':
+			oberon_read_string(ctx);
+			break;
+		case '\'':
+			oberon_read_string(ctx);
+			break;			
 		default:
 			oberon_error(ctx, "invalid char %c", ctx -> c);
 			break;
@@ -747,7 +889,14 @@ oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first,
 	oberon_expr_t * last;
 
 	*num_expr = 1;
-	*first = last = oberon_expr(ctx);
+	if(const_expr)
+	{
+		*first = last = (oberon_expr_t *) oberon_const_expr(ctx);
+	}
+	else
+	{
+		*first = last = oberon_expr(ctx);
+	}
 	while(ctx -> token == COMMA)
 	{
 		oberon_assert_token(ctx, COMMA);
@@ -857,11 +1006,29 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
 	// Допускается:
 	//  Если классы типов равны
 	//  Если INTEGER переводится в REAL
+	//  Есди STRING переводится в ARRAY OF CHAR
 
 	bool error = false;
 	if(pref -> class != expr -> result -> class)
 	{
-		if(expr -> result -> class == OBERON_TYPE_INTEGER)
+		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 -> base -> class != OBERON_TYPE_CHAR)
+				{
+					error = true;
+				}
+			}
+			else
+			{
+				error = true;
+			}
+		}
+		else if(expr -> result -> class == OBERON_TYPE_INTEGER)
 		{
 			if(pref -> class != OBERON_TYPE_REAL)
 			{
@@ -876,7 +1043,7 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
 
 	if(error)
 	{
-		oberon_error(ctx, "incompatible types");
+		oberon_error(ctx, "oberon_autocast_to: incompatible types");
 	}
 
 	if(pref -> class == OBERON_TYPE_INTEGER || pref -> class == OBERON_TYPE_REAL)
@@ -893,6 +1060,7 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
 	else if(pref -> class == OBERON_TYPE_RECORD)
 	{
 		oberon_check_record_compatibility(ctx, expr -> result, pref);
+		expr = oberno_make_record_cast(ctx, expr, pref);
 	}
 	else if(pref -> class == OBERON_TYPE_POINTER)
 	{
@@ -1106,10 +1274,14 @@ oberon_make_call_proc(oberon_context_t * ctx, oberon_object_t * proc, int num_ar
 	|| ((x) == MINUS) \
 	|| ((x) == IDENT) \
 	|| ((x) == INTEGER) \
+	|| ((x) == REAL) \
+	|| ((x) == CHAR) \
+	|| ((x) == STRING) \
+	|| ((x) == NIL) \
 	|| ((x) == LPAREN) \
 	|| ((x) == NOT) \
 	|| ((x) == TRUE) \
-	|| ((x) == FALSE))
+	|| ((x) == FALSE)) 
 
 static oberon_expr_t *
 oberno_make_dereferencing(oberon_context_t * ctx, oberon_expr_t * expr)
@@ -1262,6 +1434,26 @@ oberon_qualident(oberon_context_t * ctx, char ** xname, int check)
 	return x;
 }
 
+static oberon_expr_t *
+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_designator(oberon_context_t * ctx)
 {
@@ -1292,7 +1484,7 @@ oberon_designator(oberon_context_t * ctx)
 			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");
@@ -1373,7 +1565,7 @@ oberon_opt_func_parens(oberon_context_t * ctx, oberon_expr_t * expr)
 static void
 oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
 {
-	assert(expr -> is_item == 1);
+	assert(expr -> is_item);
 
 	int num_args = 0;
 	oberon_expr_t * arguments = NULL;
@@ -1415,6 +1607,17 @@ 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_factor(oberon_context_t * ctx)
 {
@@ -1428,11 +1631,21 @@ 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, 1);
-			expr -> item.integer = ctx -> integer;
+			expr = oberon_integer_item(ctx, ctx -> integer);
 			oberon_assert_token(ctx, INTEGER);
 			break;
+		case CHAR:
+			result = ctx -> char_type;
+			expr = oberon_new_item(MODE_CHAR, result, true);
+			expr -> item.integer = ctx -> integer;
+			oberon_assert_token(ctx, CHAR);
+			break;
+		case STRING:
+			result = ctx -> string_type;
+			expr = oberon_new_item(MODE_STRING, result, true);
+			expr -> item.string = ctx -> string;
+			oberon_assert_token(ctx, STRING);
+			break;
 		case REAL:
 			result = (ctx -> longmode) ? (ctx -> longreal_type) : (ctx -> real_type);
 			expr = oberon_new_item(MODE_REAL, result, 1);
@@ -1440,12 +1653,12 @@ oberon_factor(oberon_context_t * ctx)
 			oberon_assert_token(ctx, REAL);
 			break;
 		case TRUE:
-			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, 1);
+			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, 1);
+			expr = oberon_new_item(MODE_BOOLEAN, ctx -> bool_type, true);
 			expr -> item.boolean = false;
 			oberon_assert_token(ctx, FALSE);
 			break;
@@ -1461,7 +1674,7 @@ oberon_factor(oberon_context_t * ctx)
 			break;
 		case NIL:
 			oberon_assert_token(ctx, NIL);
-			expr = oberon_new_item(MODE_NIL, ctx -> void_ptr_type, 1);
+			expr = oberon_new_item(MODE_NIL, ctx -> void_ptr_type, true);
 			break;
 		default:
 			oberon_error(ctx, "invalid expression");
@@ -1514,6 +1727,10 @@ oberon_make_bin_op(oberon_context_t * ctx, int token, oberon_expr_t * a, oberon_
 				|| 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");
 			}
@@ -1706,6 +1923,21 @@ oberon_const_expr(oberon_context_t * ctx)
 		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:
+			/* accept */
+			break;
+		default:
+			oberon_error(ctx, "const expression are required");
+			break;
+	}
+
 	return (oberon_item_t *) expr;
 }
 
@@ -2718,6 +2950,25 @@ 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)
 {
@@ -2750,6 +3001,165 @@ 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 == RETURN)
 	{
 		oberon_assert_token(ctx, RETURN);
@@ -2895,6 +3305,9 @@ 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 -> string_type = oberon_new_type_string(1);
+	oberon_generator_init_type(ctx, ctx -> string_type);
+
 	ctx -> bool_type = oberon_new_type_boolean();
 	oberon_define_type(ctx -> world_scope, "BOOLEAN", ctx -> bool_type, 1);
 
@@ -2915,6 +3328,9 @@ register_default_types(oberon_context_t * ctx)
 
 	ctx -> longreal_type = oberon_new_type_real(8);
 	oberon_define_type(ctx -> world_scope, "LONGREAL", ctx -> longreal_type, 1);
+
+	ctx -> char_type = oberon_new_type_char(1);
+	oberon_define_type(ctx -> world_scope, "CHAR", ctx -> char_type, 1);
 }
 
 static void