[transform] Add a simple transform manager.
This CL holds a simpler manager to hold and execute multiple transforms.
Bug: tint:206
Change-Id: I45f6b55134f871167704f3549c4e4c72ef806c3a
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/29121
Reviewed-by: David Neto <dneto@google.com>
Commit-Queue: dan sinclair <dsinclair@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index 0f40dd4..26bc221 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -375,6 +375,8 @@
"src/source.h",
"src/transform/bound_array_accessors_transform.cc",
"src/transform/bound_array_accessors_transform.h",
+ "src/transform/manager.cc",
+ "src/transform/manager.h",
"src/transform/transformer.cc",
"src/transform/transformer.h",
"src/transform/vertex_pulling_transform.cc",
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c7730d6..f5c76c5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -196,6 +196,8 @@
source.h
transform/bound_array_accessors_transform.cc
transform/bound_array_accessors_transform.h
+ transform/manager.cc
+ transform/manager.h
transform/transformer.cc
transform/transformer.h
transform/vertex_pulling_transform.cc
diff --git a/src/transform/manager.cc b/src/transform/manager.cc
new file mode 100644
index 0000000..a7b3364
--- /dev/null
+++ b/src/transform/manager.cc
@@ -0,0 +1,35 @@
+// 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/transform/manager.h"
+
+namespace tint {
+namespace transform {
+
+Manager::Manager() = default;
+
+Manager::~Manager() = default;
+
+bool Manager::Run() {
+ for (auto& transform : transforms_) {
+ if (!transform->Run()) {
+ error_ = transform->error();
+ return false;
+ }
+ }
+ return true;
+}
+
+} // namespace transform
+} // namespace tint
diff --git a/src/transform/manager.h b/src/transform/manager.h
new file mode 100644
index 0000000..538e4cf
--- /dev/null
+++ b/src/transform/manager.h
@@ -0,0 +1,57 @@
+// 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.
+
+#ifndef SRC_TRANSFORM_MANAGER_H_
+#define SRC_TRANSFORM_MANAGER_H_
+
+#include <memory>
+#include <string>
+
+#include "src/transform/transformer.h"
+
+namespace tint {
+namespace transform {
+
+/// Manager for the provided passes. The passes will be execute in the
+/// appended order. If any pass fails the manager will return immediately and
+/// the error can be retrieved with the |error| method.
+class Manager {
+ public:
+ /// Constructor
+ Manager();
+ ~Manager();
+
+ /// Add pass to the manager
+ /// @param transform the transform to append
+ void append(std::unique_ptr<Transformer> transform) {
+ transforms_.push_back(std::move(transform));
+ }
+
+ /// Runs the transforms
+ /// @returns true on success; false otherwise
+ bool Run();
+
+ /// @returns the error, or blank if none set
+ std::string error() const { return error_; }
+
+ private:
+ std::vector<std::unique_ptr<Transformer>> transforms_;
+
+ std::string error_;
+};
+
+} // namespace transform
+} // namespace tint
+
+#endif // SRC_TRANSFORM_MANAGER_H_
