Eric Holk | 4273457 | 2018-12-17 15:46:18 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef DEX_LAYOUT_COMPILER_H_ |
| 18 | #define DEX_LAYOUT_COMPILER_H_ |
| 19 | |
| 20 | #include "dex_builder.h" |
| 21 | |
| 22 | #include <codecvt> |
| 23 | #include <locale> |
| 24 | #include <string> |
| 25 | #include <vector> |
| 26 | |
| 27 | namespace startop { |
| 28 | |
| 29 | // This visitor does the actual view compilation, using a supplied builder. |
| 30 | template <typename Builder> |
| 31 | class LayoutCompilerVisitor { |
| 32 | public: |
| 33 | explicit LayoutCompilerVisitor(Builder* builder) : builder_{builder} {} |
| 34 | |
| 35 | void VisitStartDocument() { builder_->Start(); } |
| 36 | void VisitEndDocument() { builder_->Finish(); } |
| 37 | void VisitStartTag(const std::u16string& name) { |
| 38 | parent_stack_.push_back(ViewEntry{ |
| 39 | std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.to_bytes(name), {}}); |
| 40 | } |
| 41 | void VisitEndTag() { |
| 42 | auto entry = parent_stack_.back(); |
| 43 | parent_stack_.pop_back(); |
| 44 | |
| 45 | if (parent_stack_.empty()) { |
| 46 | GenerateCode(entry); |
| 47 | } else { |
| 48 | parent_stack_.back().children.push_back(entry); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | private: |
| 53 | struct ViewEntry { |
| 54 | std::string name; |
| 55 | std::vector<ViewEntry> children; |
| 56 | }; |
| 57 | |
| 58 | void GenerateCode(const ViewEntry& view) { |
| 59 | builder_->StartView(view.name, !view.children.empty()); |
| 60 | for (const auto& child : view.children) { |
| 61 | GenerateCode(child); |
| 62 | } |
| 63 | builder_->FinishView(); |
| 64 | } |
| 65 | |
| 66 | Builder* builder_; |
| 67 | |
| 68 | std::vector<ViewEntry> parent_stack_; |
| 69 | }; |
| 70 | |
| 71 | class DexViewBuilder { |
| 72 | public: |
| 73 | DexViewBuilder(dex::MethodBuilder* method); |
| 74 | |
| 75 | void Start(); |
| 76 | void Finish(); |
| 77 | void StartView(const std::string& name, bool is_viewgroup); |
| 78 | void FinishView(); |
| 79 | |
| 80 | private: |
| 81 | // Accessors for the stack of views that are under construction. |
Eric Holk | 5c6a1a5 | 2019-09-17 13:28:34 -0700 | [diff] [blame] | 82 | dex::LiveRegister AcquireRegister(); |
Eric Holk | 4273457 | 2018-12-17 15:46:18 -0800 | [diff] [blame] | 83 | dex::Value GetCurrentView() const; |
| 84 | dex::Value GetCurrentLayoutParams() const; |
| 85 | dex::Value GetParentView() const; |
| 86 | void PopViewStack(); |
| 87 | |
Eric Holk | 5c6a1a5 | 2019-09-17 13:28:34 -0700 | [diff] [blame] | 88 | // Methods to simplify building different code fragments. |
| 89 | void BuildGetLayoutInflater(dex::Value dest); |
| 90 | void BuildGetResources(dex::Value dest); |
| 91 | void BuildGetLayoutResource(dex::Value dest, dex::Value resources, dex::Value resid); |
| 92 | void BuildLayoutResourceToAttributeSet(dex::Value dest, dex::Value layout_resource); |
| 93 | void BuildXmlNext(); |
| 94 | void BuildTryCreateView(dex::Value dest, dex::Value parent, dex::Value classname); |
| 95 | |
Eric Holk | 4273457 | 2018-12-17 15:46:18 -0800 | [diff] [blame] | 96 | dex::MethodBuilder* method_; |
| 97 | |
Eric Holk | 5c6a1a5 | 2019-09-17 13:28:34 -0700 | [diff] [blame] | 98 | // Parameters to the generated method |
Eric Holk | 4273457 | 2018-12-17 15:46:18 -0800 | [diff] [blame] | 99 | dex::Value const context_; |
| 100 | dex::Value const resid_; |
Eric Holk | 5c6a1a5 | 2019-09-17 13:28:34 -0700 | [diff] [blame] | 101 | |
| 102 | // Registers used for code generation |
| 103 | const dex::LiveRegister inflater_; |
| 104 | const dex::LiveRegister xml_; |
| 105 | const dex::LiveRegister attrs_; |
| 106 | const dex::LiveRegister classname_tmp_; |
Eric Holk | 4273457 | 2018-12-17 15:46:18 -0800 | [diff] [blame] | 107 | |
| 108 | const dex::MethodDeclData xml_next_; |
| 109 | const dex::MethodDeclData try_create_view_; |
| 110 | const dex::MethodDeclData generate_layout_params_; |
| 111 | const dex::MethodDeclData add_view_; |
| 112 | |
Eric Holk | 4273457 | 2018-12-17 15:46:18 -0800 | [diff] [blame] | 113 | // Keep track of the views currently in progress. |
| 114 | struct ViewEntry { |
Eric Holk | 5c6a1a5 | 2019-09-17 13:28:34 -0700 | [diff] [blame] | 115 | dex::LiveRegister view; |
| 116 | std::optional<dex::LiveRegister> layout_params; |
Eric Holk | 4273457 | 2018-12-17 15:46:18 -0800 | [diff] [blame] | 117 | }; |
| 118 | std::vector<ViewEntry> view_stack_; |
| 119 | }; |
| 120 | |
| 121 | } // namespace startop |
| 122 | |
| 123 | #endif // DEX_LAYOUT_COMPILER_H_ |