parser, cgen: fix static and volatile var deref (fix #24778) (fix #24779) (#24807)

Author: felipensp

cmd/tools/vast/vast.v

@@ -956,6 +956,8 @@ fn (t Tree) var(node ast.Var) &Node {
 	obj.add_terse('expr', t.expr(node.expr))
 	obj.add_terse('is_arg', t.bool_node(node.is_arg))
 	obj.add_terse('is_mut', t.bool_node(node.is_mut))
+	obj.add_terse('is_static', t.bool_node(node.is_static))
+	obj.add_terse('is_volatile', t.bool_node(node.is_volatile))
 	obj.add('is_used', t.bool_node(node.is_used))
 	obj.add('is_changed', t.bool_node(node.is_changed))
 	obj.add_terse('ct_type_var', t.enum_node(node.ct_type_var))

vlib/v/ast/ast.v

@@ -904,6 +904,8 @@ pub:
 	name            string
 	share           ShareType
 	is_mut          bool
+	is_static       bool
+	is_volatile     bool
 	is_autofree_tmp bool
 	is_inherited    bool
 	has_inherited   bool

vlib/v/gen/c/assign.v

@@ -179,9 +179,15 @@ fn (mut g Gen) expr_with_opt(expr ast.Expr, expr_typ ast.Type, ret_typ ast.Type)
 fn (mut g Gen) assign_stmt(node_ ast.AssignStmt) {
 	mut node := unsafe { node_ }
 	if node.is_static {
-		g.write('static ')
+		is_defer_var := node.left[0] is ast.Ident && node.left[0].name in g.defer_vars
+		if is_defer_var && node.op == .decl_assign {
+			return
+		}
+		if !is_defer_var {
+			g.write('static ')
+		}
 	}
-	if node.is_volatile {
+	if node.is_volatile && node.left[0] is ast.Ident && node.left[0].name !in g.defer_vars {
 		g.write('volatile ')
 	}
 	mut return_type := ast.void_type

vlib/v/gen/c/fn.v

@@ -444,6 +444,12 @@ fn (mut g Gen) gen_fn_decl(node &ast.FnDecl, skip bool) {
 					}
 					info := var.obj as ast.Var
 					if g.table.sym(info.typ).kind != .function {
+						if info.is_static {
+							g.write('static ')
+						}
+						if info.is_volatile {
+							g.write('volatile ')
+						}
 						g.writeln('${g.styp(info.typ)}${deref} ${c_name(var.name)};')
 					}
 				}

vlib/v/parser/assign.v

@@ -224,6 +224,8 @@ fn (mut p Parser) partial_assign_stmt(left []ast.Expr) ast.Stmt {
 						expr:         if left.len == right.len { right[i] } else { ast.empty_expr }
 						share:        share
 						is_mut:       lx.is_mut || p.inside_for
+						is_static:    is_static
+						is_volatile:  is_volatile
 						pos:          lx.pos
 						is_stack_obj: p.inside_for
 					}

vlib/v/tests/defer/defer_static_test.v

@@ -0,0 +1,35 @@
+@[unsafe]
+fn g() {
+	mut static levels := 0
+	levels++
+	defer { levels-- }
+}
+
+fn f(depth int) {
+	if depth == 0 {
+		return
+	}
+	unsafe {
+		mut static levels := 0
+		levels++
+		defer { levels-- }
+		if depth == 3 {
+			assert levels == 1
+		}
+		if depth == 2 {
+			assert levels == 2
+		}
+		if depth == 1 {
+			assert levels == 3
+		}
+		println('levels: ${levels} | depth: ${depth}')
+	}
+	f(depth - 1)
+}
+
+fn test_main() {
+	f(3)
+	f(3)
+
+	unsafe { g() }
+}