[view compiler] Add XML to DEX compilation
Test: atest
Bug: 111895153
Change-Id: I91c01ff4474e080c87b902ae963b5d655346f859
diff --git a/startop/view_compiler/dex_layout_compiler.h b/startop/view_compiler/dex_layout_compiler.h
new file mode 100644
index 0000000..170a1a6
--- /dev/null
+++ b/startop/view_compiler/dex_layout_compiler.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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 DEX_LAYOUT_COMPILER_H_
+#define DEX_LAYOUT_COMPILER_H_
+
+#include "dex_builder.h"
+
+#include <codecvt>
+#include <locale>
+#include <string>
+#include <vector>
+
+namespace startop {
+
+// This visitor does the actual view compilation, using a supplied builder.
+template <typename Builder>
+class LayoutCompilerVisitor {
+ public:
+ explicit LayoutCompilerVisitor(Builder* builder) : builder_{builder} {}
+
+ void VisitStartDocument() { builder_->Start(); }
+ void VisitEndDocument() { builder_->Finish(); }
+ void VisitStartTag(const std::u16string& name) {
+ parent_stack_.push_back(ViewEntry{
+ std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.to_bytes(name), {}});
+ }
+ void VisitEndTag() {
+ auto entry = parent_stack_.back();
+ parent_stack_.pop_back();
+
+ if (parent_stack_.empty()) {
+ GenerateCode(entry);
+ } else {
+ parent_stack_.back().children.push_back(entry);
+ }
+ }
+
+ private:
+ struct ViewEntry {
+ std::string name;
+ std::vector<ViewEntry> children;
+ };
+
+ void GenerateCode(const ViewEntry& view) {
+ builder_->StartView(view.name, !view.children.empty());
+ for (const auto& child : view.children) {
+ GenerateCode(child);
+ }
+ builder_->FinishView();
+ }
+
+ Builder* builder_;
+
+ std::vector<ViewEntry> parent_stack_;
+};
+
+class DexViewBuilder {
+ public:
+ DexViewBuilder(dex::MethodBuilder* method);
+
+ void Start();
+ void Finish();
+ void StartView(const std::string& name, bool is_viewgroup);
+ void FinishView();
+
+ private:
+ // Accessors for the stack of views that are under construction.
+ dex::Value AcquireRegister();
+ void ReleaseRegister();
+ dex::Value GetCurrentView() const;
+ dex::Value GetCurrentLayoutParams() const;
+ dex::Value GetParentView() const;
+ void PopViewStack();
+
+ dex::MethodBuilder* method_;
+
+ // Registers used for code generation
+ dex::Value const context_;
+ dex::Value const resid_;
+ const dex::Value inflater_;
+ const dex::Value xml_;
+ const dex::Value attrs_;
+ const dex::Value classname_tmp_;
+
+ const dex::MethodDeclData xml_next_;
+ const dex::MethodDeclData try_create_view_;
+ const dex::MethodDeclData generate_layout_params_;
+ const dex::MethodDeclData add_view_;
+
+ // used for keeping track of which registers are in use
+ size_t top_register_{0};
+ std::vector<dex::Value> register_stack_;
+
+ // Keep track of the views currently in progress.
+ struct ViewEntry {
+ dex::Value view;
+ std::optional<dex::Value> layout_params;
+ };
+ std::vector<ViewEntry> view_stack_;
+};
+
+} // namespace startop
+
+#endif // DEX_LAYOUT_COMPILER_H_