cgen: fix for_in map of fixed_array (#9133)

vlib/v/gen/c/cgen.v

@@ -1467,20 +1467,30 @@ fn (mut g Gen) for_in_stmt(node ast.ForInStmt) {
 	} else if node.kind == .map {
 		// `for key, val in map {
 		g.writeln('// FOR IN map')
-		idx := g.new_tmp_var()
-		atmp := g.new_tmp_var()
+		mut cond_var := ''
+		if node.cond is ast.Ident {
+			pos := g.out.len
+			g.expr(node.cond)
+			cond_var = g.out.after(pos)
+			g.out.go_back(cond_var.len)
+			cond_var = cond_var.trim_space()
+		} else {
+			cond_var = g.new_tmp_var()
+			g.write(g.typ(node.cond_type))
+			g.write(' $cond_var = ')
+			g.expr(node.cond)
+			g.writeln(';')
+		}
 		arw_or_pt := if node.cond_type.is_ptr() { '->' } else { '.' }
-		g.write(g.typ(node.cond_type))
-		g.write(' $atmp = ')
-		g.expr(node.cond)
-		g.writeln(';')
-		g.writeln('for (int $idx = 0; $idx < $atmp${arw_or_pt}key_values.len; ++$idx) {')
+		idx := g.new_tmp_var()
+		g.empty_line = true
+		g.writeln('for (int $idx = 0; $idx < $cond_var${arw_or_pt}key_values.len; ++$idx) {')
 		// TODO: don't have this check when the map has no deleted elements
-		g.writeln('\tif (!DenseArray_has_index(&$atmp${arw_or_pt}key_values, $idx)) {continue;}')
+		g.writeln('\tif (!DenseArray_has_index(&$cond_var${arw_or_pt}key_values, $idx)) {continue;}')
 		if node.key_var != '_' {
 			key_styp := g.typ(node.key_type)
 			key := c_name(node.key_var)
-			g.writeln('\t$key_styp $key = /*key*/ *($key_styp*)DenseArray_key(&$atmp${arw_or_pt}key_values, $idx);')
+			g.writeln('\t$key_styp $key = /*key*/ *($key_styp*)DenseArray_key(&$cond_var${arw_or_pt}key_values, $idx);')
 			// TODO: analyze whether node.key_type has a .clone() method and call .clone() for all types:
 			if node.key_type == table.string_type {
 				g.writeln('\t$key = string_clone($key);')
@@ -1492,6 +1502,11 @@ fn (mut g Gen) for_in_stmt(node ast.ForInStmt) {
 				g.write('\t')
 				g.write_fn_ptr_decl(val_sym.info as table.FnType, c_name(node.val_var))
 				g.write(' = (*(voidptr*)')
+				g.writeln('DenseArray_value(&$cond_var${arw_or_pt}key_values, $idx));')
+			} else if val_sym.kind == .array_fixed && !node.val_is_mut {
+				val_styp := g.typ(node.val_type)
+				g.writeln('\t$val_styp ${c_name(node.val_var)};')
+				g.writeln('\tmemcpy(*($val_styp*)${c_name(node.val_var)}, (byte*)DenseArray_value(&$cond_var${arw_or_pt}key_values, $idx), sizeof($val_styp));')
 			} else {
 				val_styp := g.typ(node.val_type)
 				if node.val_type.is_ptr() {
@@ -1499,21 +1514,9 @@ fn (mut g Gen) for_in_stmt(node ast.ForInStmt) {
 				} else {
 					g.write('\t$val_styp ${c_name(node.val_var)} = (*($val_styp*)')
 				}
+				g.writeln('DenseArray_value(&$cond_var${arw_or_pt}key_values, $idx));')
 			}
-			g.writeln('DenseArray_value(&$atmp${arw_or_pt}key_values, $idx));')
 		}
-		g.stmts(node.stmts)
-		if node.key_type == table.string_type && !g.is_builtin_mod {
-			// g.writeln('string_free(&$key);')
-		}
-		if node.label.len > 0 {
-			g.writeln('\t${node.label}__continue: {}')
-		}
-		g.writeln('}')
-		if node.label.len > 0 {
-			g.writeln('\t${node.label}__break: {}')
-		}
-		return
 	} else if node.kind == .string {
 		i := if node.key_var in ['', '_'] { g.new_tmp_var() } else { node.key_var }
 		g.write('for (int $i = 0; $i < ')

vlib/v/tests/for_in_containers_of_fixed_array_test.v

@@ -49,3 +49,29 @@ fn test_for_mut_in_fixed_array_of_fixed_array() {
 	assert rets[1] == '[3, 4]'
 	assert rets[2] == '[5, 6]'
 }
+
+fn test_for_in_map_of_fixed_array() {
+	mut rets := []string{}
+	m := map{'aa': [1, 2]!, 'bb': [3, 4]!, 'cc': [5, 6]!}
+
+	for k, v in m {
+		println('$k, $v')
+		rets << '$k, $v'
+	}
+	assert rets[0] == 'aa, [1, 2]'
+	assert rets[1] == 'bb, [3, 4]'
+	assert rets[2] == 'cc, [5, 6]'
+}
+
+fn test_for_mut_in_map_of_fixed_array() {
+	mut rets := []string{}
+	mut m := map{'aa': [1, 2]!, 'bb': [3, 4]!, 'cc': [5, 6]!}
+
+	for k, mut v in m {
+		println('$k, $v')
+		rets << '$k, $v'
+	}
+	assert rets[0] == 'aa, [1, 2]'
+	assert rets[1] == 'bb, [3, 4]'
+	assert rets[2] == 'cc, [5, 6]'
+}