checker: check C args

vlib/builtin/array.v

@@ -311,18 +311,20 @@ fn (a mut array) push(val voidptr) {
 
 // `val` is array.data
 // TODO make private, right now it's used by strings.Builder
-pub fn (a mut array) push_many(val voidptr, size int) {
-	// handle `arr << arr`
-	if a.data == val {
-		copy := a.clone()
-		a.ensure_cap(a.len + size)
+pub fn (a3 mut array) push_many(val voidptr, size int) {
+	if a3.data == val {
+		// handle `arr << arr`
+		copy := a3.clone()
+		a3.ensure_cap(a3.len + size)
+		C.printf("%d", a3.len*2)
+		println(a3.len*2)
 		//C.memcpy(a.data, copy.data, copy.element_size * copy.len)
-		C.memcpy(a.data + a.element_size * a.len, copy.data, a.element_size * size)
+		C.memcpy(a3.data + a3.element_size * a3.len, copy.data, a3.element_size * size)
 	} else {
-		a.ensure_cap(a.len + size)
-		C.memcpy(a.data + a.element_size * a.len, val, a.element_size * size)
+		a3.ensure_cap(a3.len + size)
+		C.memcpy(a3.data + a3.element_size * a3.len, val, a3.element_size * size)
 	}
-	a.len += size
+	a3.len += size
 }
 
 // array.reverse returns a new array with the elements of
@@ -578,7 +580,7 @@ pub fn compare_f32(a, b &f32) int {
 	return 0
 }
 
-// a.pointers() returns a new array, where each element 
+// a.pointers() returns a new array, where each element
 // is the address of the corresponding element in a.
 pub fn (a array) pointers() []voidptr {
 	mut res := []voidptr

vlib/v/checker/checker.v

@@ -207,6 +207,9 @@ pub fn (c mut Checker) call_expr(call_expr mut ast.CallExpr) table.Type {
 		c.error('unknown fn: $fn_name', call_expr.pos)
 	}
 	if f.is_c || call_expr.is_c {
+		for expr in call_expr.args {
+			c.expr(expr)
+		}
 		return f.return_type
 	}
 	if call_expr.args.len < f.args.len {
@@ -303,6 +306,7 @@ pub fn (c mut Checker) method_call_expr(method_call_expr mut ast.MethodCallExpr)
 pub fn (c mut Checker) selector_expr(selector_expr mut ast.SelectorExpr) table.Type {
 	typ := c.expr(selector_expr.expr)
 	selector_expr.expr_type = typ
+	// println('sel expr line_nr=$selector_expr.pos.line_nr typ=$selector_expr.expr_type')
 	typ_sym := c.table.get_type_symbol(typ)
 	field_name := selector_expr.field
 	if field := typ_sym.find_field(field_name) {
@@ -322,10 +326,6 @@ pub fn (c mut Checker) selector_expr(selector_expr mut ast.SelectorExpr) table.T
 		}
 	}
 	if typ_sym.kind != .struct_ {
-		if field_name == 'default_mode' {
-			// TODO
-			return table.bool_type
-		}
 		c.error('`$typ_sym.name` is not a struct', selector_expr.pos)
 	}
 	else {
@@ -632,7 +632,7 @@ pub fn (c mut Checker) expr(node ast.Expr) table.Type {
 }
 
 pub fn (c mut Checker) ident(ident mut ast.Ident) table.Type {
-	// println('IDENT: $it.name - $it.pos.pos')
+	// println('IDENT: $ident.name - $ident.pos.pos')
 	if ident.kind == .variable {
 		// println('===========================')
 		// c.scope.print_vars(0)
@@ -656,7 +656,7 @@ pub fn (c mut Checker) ident(ident mut ast.Ident) table.Type {
 			// update the variable
 			// we need to do this here instead of var_decl since some
 			// vars are registered manually for things like for loops etc
-			// NOTE: or consider making those declerations part of those ast nodes
+			// NOTE: or consider making those declarations part of those ast nodes
 			mut typ := var.typ
 			// set var type on first use
 			if typ == 0 {

vlib/v/gen/cgen.v

@@ -622,6 +622,8 @@ fn (g mut Gen) expr(node ast.Expr) {
 			g.write('sizeof($it.type_name)')
 		}
 		ast.StringLiteral {
+			// In C calls we have to generate C strings
+			// `C.printf("hi")` => `printf("hi");`
 			if g.is_c_call {
 				g.write('"$it.val"')
 			}

vlib/v/gen/tests/1.c

@@ -94,6 +94,7 @@ i < 10; i++) {
 }
 
 void User_inc_age(User* u, int n) {
+	printf("%d", u->age);
 	u->age += n;
 }
 

vlib/v/gen/tests/1.vv

@@ -91,7 +91,10 @@ fn foo(a int) {
 
 }
 
+fn C.printf()
+
 fn (u mut User) inc_age(n int) {
+	C.printf("%d", u.age)
 	u.age += n
 }