checker/gen: add unchecked exprs & small fixes

vlib/os/os.v

@@ -235,14 +235,14 @@ fn vfopen(path, mode string) &C.FILE {
 // read_lines reads the file in `path` into an array of lines.
 pub fn read_lines(path string) ?[]string {
 	buf := read_file(path) or {
-		return err
+		return error(err)
 	}
 	return buf.split_into_lines()
 }
 
 fn read_ulines(path string) ?[]ustring {
 	lines := read_lines(path) or {
-		return err
+		return error(err)
 	}
 	// mut ulines := new_array(0, lines.len, sizeof(ustring))
 	mut ulines := []ustring

vlib/v/checker/checker.v

@@ -82,7 +82,8 @@ pub fn (c mut Checker) check_struct_init(struct_init ast.StructInit) table.Type
 		.placeholder {
 			c.error('unknown struct: $typ_sym.name', struct_init.pos)
 		}
-		.struct_ {
+		// string & array are also structs but .kind of string/array
+		.struct_, .string, .array {
 			info := typ_sym.info as table.Struct
 			if struct_init.fields.len == 0 {
 				// Short syntax TODO check
@@ -154,17 +155,15 @@ pub fn (c mut Checker) infix_expr(infix_expr mut ast.InfixExpr) table.Type {
 }
 
 fn (c mut Checker) assign_expr(assign_expr mut ast.AssignExpr) {
-	if ast.expr_is_blank_ident(assign_expr.left) {
-		return
-	}
 	left_type := c.expr(assign_expr.left)
 	c.expected_type = left_type
 	assign_expr.left_type = left_type
-	// assign_expr.left_type = left_type
-	// t := c.table.get_type_symbol(left_type)
 	// println('setting exp type to $c.expected_type $t.name')
 	right_type := c.expr(assign_expr.val)
 	assign_expr.right_type = right_type
+	if ast.expr_is_blank_ident(assign_expr.left) {
+		return
+	}
 	if !c.table.check(right_type, left_type) {
 		left_type_sym := c.table.get_type_symbol(left_type)
 		right_type_sym := c.table.get_type_symbol(right_type)
@@ -174,18 +173,19 @@ fn (c mut Checker) assign_expr(assign_expr mut ast.AssignExpr) {
 
 pub fn (c mut Checker) call_expr(call_expr mut ast.CallExpr) table.Type {
 	fn_name := call_expr.name
+	c.stmts(call_expr.or_block.stmts)
 	// TODO: impl typeof properly (probably not going to be a fn call)
 	if fn_name == 'typeof' {
 		return table.string_type
 	}
 	// start hack: until v1 is fixed and c definitions are added for these
+	if fn_name in ['C.calloc', 'C.exit', 'C.free'] {
+		for arg in call_expr.args {
+			c.expr(arg.expr)
+		}
 		if fn_name == 'C.calloc' {
 			return table.byteptr_type
 		}
-	else if fn_name == 'C.exit' {
-		return table.void_type
-	}
-	else if fn_name == 'C.free' {
 		return table.void_type
 	}
 	// end hack
@@ -224,6 +224,7 @@ pub fn (c mut Checker) call_expr(call_expr mut ast.CallExpr) table.Type {
 	}
 	if !found {
 		c.error('unknown fn: $fn_name', call_expr.pos)
+		return table.void_type
 	}
 	call_expr.return_type = f.return_type
 	if f.is_c || call_expr.is_c {
@@ -275,6 +276,7 @@ pub fn (c mut Checker) method_call_expr(method_call_expr mut ast.MethodCallExpr)
 	method_call_expr.expr_type = typ
 	typ_sym := c.table.get_type_symbol(typ)
 	name := method_call_expr.name
+	c.stmts(method_call_expr.or_block.stmts)
 	// println('method call $name $method_call_expr.pos.line_nr')
 	if typ_sym.kind == .array && name in ['filter', 'clone', 'repeat'] {
 		if name == 'filter' {
@@ -285,12 +287,11 @@ pub fn (c mut Checker) method_call_expr(method_call_expr mut ast.MethodCallExpr)
 				typ: array_info.elem_type
 			})
 		}
-		else if name == 'repeat' {
+		for i, arg in method_call_expr.args {
-			c.expr(method_call_expr.args[0].expr)
+			c.expr(arg.expr)
 		}
 		// need to return `array_xxx` instead of `array`
 		method_call_expr.return_type = typ
-		// method_call_expr.receiver_type = typ
 		return typ
 	}
 	else if typ_sym.kind == .array && name in ['first', 'last'] {
@@ -466,7 +467,6 @@ pub fn (c mut Checker) array_init(array_init mut ast.ArrayInit) table.Type {
 	// [1,2,3]
 	if array_init.exprs.len > 0 && array_init.elem_type == table.void_type {
 		for i, expr in array_init.exprs {
-			c.expr(expr)
 			typ := c.expr(expr)
 			// The first element's type
 			if i == 0 {

vlib/v/gen/cgen.v

@@ -412,7 +412,7 @@ fn (g mut Gen) gen_assign_stmt(assign_stmt ast.AssignStmt) {
 				else {
 					g.write('{$styp _ = ')
 					g.expr(val)
-					g.writeln('}')
+					g.writeln(';}')
 				}
 			}
 			else {
@@ -575,7 +575,7 @@ fn (g mut Gen) expr(node ast.Expr) {
 				else {
 					g.write('{${g.typ(it.left_type)} _ = ')
 					g.expr(it.val)
-					g.writeln('}')
+					g.writeln(';}')
 				}
 			}
 			else {
@@ -732,12 +732,13 @@ fn (g mut Gen) expr(node ast.Expr) {
 			}
 		}
 		ast.MethodCallExpr {
-			mut receiver_name := 'TODO'
 			// TODO: there are still due to unchecked exprs (opt/some fn arg)
-			if it.expr_type != 0 {
+			if it.expr_type == 0 {
+				verror('method receiver type is 0, this means there are some uchecked exprs')
+			}
 			typ_sym := g.table.get_type_symbol(it.expr_type)
 			// rec_sym := g.table.get_type_symbol(it.receiver_type)
-				receiver_name = typ_sym.name
+			mut receiver_name := typ_sym.name
 			if typ_sym.kind == .array && it.name in
 			// TODO performance, detect `array` method differently
 			['repeat', 'sort_with_compare', 'free', 'push_many', 'trim', 'first', 'clone'] {
@@ -746,7 +747,6 @@ fn (g mut Gen) expr(node ast.Expr) {
 				// `array_byte_clone` => `array_clone`
 				receiver_name = 'array'
 			}
-			}
 			name := '${receiver_name}_$it.name'.replace('.', '__')
 			// if it.receiver_type != 0 {
 			// g.write('/*${g.typ(it.receiver_type)}*/')

vlib/v/parser/fn.v

@@ -17,12 +17,19 @@ pub fn (p mut Parser) call_expr(is_c bool, mod string) ast.CallExpr {
 	mut or_stmts := []ast.Stmt
 	if p.tok.kind == .key_orelse {
 		p.next()
-		or_stmts = p.parse_block()
+		p.open_scope()
+		p.scope.register_var(ast.Var{
+			name: 'err'
+			typ: table.type_to_optional(table.string_type)
+		})
+		or_stmts = p.parse_block_no_scope()
+		p.close_scope()
 	}
 	node := ast.CallExpr{
 		name: fn_name
 		args: args
 		// tok: tok
+		
 		pos: tok.position()
 		is_c: is_c
 		or_block: ast.OrExpr{

vlib/v/parser/parser.v

@@ -193,6 +193,14 @@ pub fn (p mut Parser) close_scope() {
 
 pub fn (p mut Parser) parse_block() []ast.Stmt {
 	p.open_scope()
+	// println('parse block')
+	stmts := p.parse_block_no_scope()
+	p.close_scope()
+	// println('nr exprs in block = $exprs.len')
+	return stmts
+}
+
+pub fn (p mut Parser) parse_block_no_scope() []ast.Stmt {
 	p.check(.lcbr)
 	mut stmts := []ast.Stmt
 	if p.tok.kind != .rcbr {
@@ -205,9 +213,6 @@ pub fn (p mut Parser) parse_block() []ast.Stmt {
 		}
 	}
 	p.check(.rcbr)
-	// println('parse block')
-	p.close_scope()
-	// println('nr exprs in block = $exprs.len')
 	return stmts
 }
 
@@ -945,15 +950,21 @@ fn (p mut Parser) dot_expr(left ast.Expr) ast.Expr {
 		// p.close_scope()
 		// }
 	}
-	// Method call
 	pos := p.tok.position()
+	// Method call
 	if p.tok.kind == .lpar {
 		p.next()
 		args := p.call_args()
 		mut or_stmts := []ast.Stmt
 		if p.tok.kind == .key_orelse {
 			p.next()
-			or_stmts = p.parse_block()
+			p.open_scope()
+			p.scope.register_var(ast.Var{
+				name: 'err'
+				typ: table.type_to_optional(table.string_type)
+			})
+			or_stmts = p.parse_block_no_scope()
+			p.close_scope()
 		}
 		mcall_expr := ast.MethodCallExpr{
 			expr: left