v.ast: add .free() methods, so vls can be more decoupled

vlib/v/ast/ast.v

@@ -564,6 +564,24 @@ pub mut:
 	global_labels    []string // from `asm { .globl labelname }`
 }
 
+[unsafe]
+pub fn (f &File) free() {
+	unsafe {
+		f.path.free()
+		f.path_base.free()
+		f.scope.free()
+		f.stmts.free()
+		f.imports.free()
+		f.auto_imports.free()
+		f.embedded_files.free()
+		f.imported_symbols.free()
+		f.errors.free()
+		f.warnings.free()
+		f.notices.free()
+		f.global_labels.free()
+	}
+}
+
 pub struct IdentFn {
 pub mut:
 	typ Type

vlib/v/ast/scope.v

@@ -15,6 +15,18 @@ pub mut:
 	end_pos              int
 }
 
+[unsafe]
+pub fn (s &Scope) free() {
+	unsafe {
+		s.objects.free()
+		s.struct_fields.free()
+		for child in s.children {
+			child.free()
+		}
+		s.children.free()
+	}
+}
+
 pub fn new_scope(parent &Scope, start_pos int) &Scope {
 	return &Scope{
 		parent: parent

vlib/v/ast/table.v

@@ -24,6 +24,24 @@ pub mut:
 	used_consts      map[string]bool // filled in by the checker, when pref.skip_unused = true;
 }
 
+[unsafe]
+pub fn (t &Table) free() {
+	unsafe {
+		t.type_symbols.free()
+		t.type_idxs.free()
+		t.fns.free()
+		t.dumps.free()
+		t.imports.free()
+		t.modules.free()
+		t.cflags.free()
+		t.redefined_fns.free()
+		t.fn_generic_types.free()
+		t.cmod_prefix.free()
+		t.used_fns.free()
+		t.used_consts.free()
+	}
+}
+
 pub struct Fn {
 pub:
 	params         []Param