[ast] Add DiscardStatement AST node.
This CL adds DiscardStatement to the AST.
Bug: tint:162
Change-Id: I1905023eb8297d9a983884e77c6a2267fd43a076
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/25601
Reviewed-by: David Neto <dneto@google.com>
diff --git a/src/ast/discard_statement.cc b/src/ast/discard_statement.cc
new file mode 100644
index 0000000..6864aa0
--- /dev/null
+++ b/src/ast/discard_statement.cc
@@ -0,0 +1,40 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/ast/discard_statement.h"
+
+namespace tint {
+namespace ast {
+
+DiscardStatement::DiscardStatement() : Statement() {}
+
+DiscardStatement::DiscardStatement(const Source& source) : Statement(source) {}
+
+DiscardStatement::~DiscardStatement() = default;
+
+bool DiscardStatement::IsDiscard() const {
+ return true;
+}
+
+bool DiscardStatement::IsValid() const {
+ return true;
+}
+
+void DiscardStatement::to_str(std::ostream& out, size_t indent) const {
+ make_indent(out, indent);
+ out << "Discard{}" << std::endl;
+}
+
+} // namespace ast
+} // namespace tint
