226 lines
9.3 KiB
C++
226 lines
9.3 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dex_layout_compiler.h"
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#include "layout_validation.h"
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#include "android-base/stringprintf.h"
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namespace startop {
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using android::base::StringPrintf;
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void LayoutValidationVisitor::VisitStartTag(const std::u16string& name) {
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if (0 == name.compare(u"merge")) {
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message_ = "Merge tags are not supported";
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can_compile_ = false;
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}
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if (0 == name.compare(u"include")) {
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message_ = "Include tags are not supported";
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can_compile_ = false;
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}
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if (0 == name.compare(u"view")) {
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message_ = "View tags are not supported";
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can_compile_ = false;
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}
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if (0 == name.compare(u"fragment")) {
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message_ = "Fragment tags are not supported";
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can_compile_ = false;
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}
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}
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DexViewBuilder::DexViewBuilder(dex::MethodBuilder* method)
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: method_{method},
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context_{dex::Value::Parameter(0)},
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resid_{dex::Value::Parameter(1)},
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inflater_{method->MakeRegister()},
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xml_{method->MakeRegister()},
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attrs_{method->MakeRegister()},
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classname_tmp_{method->MakeRegister()},
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xml_next_{method->dex_file()->GetOrDeclareMethod(
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dex::TypeDescriptor::FromClassname("android.content.res.XmlResourceParser"), "next",
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dex::Prototype{dex::TypeDescriptor::Int()})},
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try_create_view_{method->dex_file()->GetOrDeclareMethod(
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dex::TypeDescriptor::FromClassname("android.view.LayoutInflater"), "tryCreateView",
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dex::Prototype{dex::TypeDescriptor::FromClassname("android.view.View"),
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dex::TypeDescriptor::FromClassname("android.view.View"),
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dex::TypeDescriptor::FromClassname("java.lang.String"),
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dex::TypeDescriptor::FromClassname("android.content.Context"),
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dex::TypeDescriptor::FromClassname("android.util.AttributeSet")})},
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generate_layout_params_{method->dex_file()->GetOrDeclareMethod(
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dex::TypeDescriptor::FromClassname("android.view.ViewGroup"), "generateLayoutParams",
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dex::Prototype{dex::TypeDescriptor::FromClassname("android.view.ViewGroup$LayoutParams"),
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dex::TypeDescriptor::FromClassname("android.util.AttributeSet")})},
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add_view_{method->dex_file()->GetOrDeclareMethod(
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dex::TypeDescriptor::FromClassname("android.view.ViewGroup"), "addView",
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dex::Prototype{
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dex::TypeDescriptor::Void(),
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dex::TypeDescriptor::FromClassname("android.view.View"),
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dex::TypeDescriptor::FromClassname("android.view.ViewGroup$LayoutParams")})},
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// The register stack starts with one register, which will be null for the root view.
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register_stack_{{method->MakeRegister()}} {}
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void DexViewBuilder::Start() {
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dex::DexBuilder* const dex = method_->dex_file();
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// LayoutInflater inflater = LayoutInflater.from(context);
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auto layout_inflater_from = dex->GetOrDeclareMethod(
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dex::TypeDescriptor::FromClassname("android.view.LayoutInflater"),
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"from",
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dex::Prototype{dex::TypeDescriptor::FromClassname("android.view.LayoutInflater"),
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dex::TypeDescriptor::FromClassname("android.content.Context")});
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method_->AddInstruction(
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dex::Instruction::InvokeStaticObject(layout_inflater_from.id, /*dest=*/inflater_, context_));
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// Resources res = context.getResources();
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auto context_type = dex::TypeDescriptor::FromClassname("android.content.Context");
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auto resources_type = dex::TypeDescriptor::FromClassname("android.content.res.Resources");
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auto get_resources =
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dex->GetOrDeclareMethod(context_type, "getResources", dex::Prototype{resources_type});
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method_->AddInstruction(dex::Instruction::InvokeVirtualObject(get_resources.id, xml_, context_));
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// XmlResourceParser xml = res.getLayout(resid);
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auto xml_resource_parser_type =
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dex::TypeDescriptor::FromClassname("android.content.res.XmlResourceParser");
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auto get_layout =
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dex->GetOrDeclareMethod(resources_type,
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"getLayout",
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dex::Prototype{xml_resource_parser_type, dex::TypeDescriptor::Int()});
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method_->AddInstruction(dex::Instruction::InvokeVirtualObject(get_layout.id, xml_, xml_, resid_));
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// AttributeSet attrs = Xml.asAttributeSet(xml);
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auto as_attribute_set = dex->GetOrDeclareMethod(
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dex::TypeDescriptor::FromClassname("android.util.Xml"),
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"asAttributeSet",
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dex::Prototype{dex::TypeDescriptor::FromClassname("android.util.AttributeSet"),
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dex::TypeDescriptor::FromClassname("org.xmlpull.v1.XmlPullParser")});
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method_->AddInstruction(dex::Instruction::InvokeStaticObject(as_attribute_set.id, attrs_, xml_));
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// xml.next(); // start document
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method_->AddInstruction(dex::Instruction::InvokeInterface(xml_next_.id, {}, xml_));
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}
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void DexViewBuilder::Finish() {}
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namespace {
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std::string ResolveName(const std::string& name) {
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if (name == "View") return "android.view.View";
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if (name == "ViewGroup") return "android.view.ViewGroup";
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if (name.find(".") == std::string::npos) {
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return StringPrintf("android.widget.%s", name.c_str());
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}
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return name;
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}
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} // namespace
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void DexViewBuilder::StartView(const std::string& name, bool is_viewgroup) {
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bool const is_root_view = view_stack_.empty();
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// xml.next(); // start tag
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method_->AddInstruction(dex::Instruction::InvokeInterface(xml_next_.id, {}, xml_));
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dex::Value view = AcquireRegister();
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// try to create the view using the factories
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method_->BuildConstString(classname_tmp_,
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name); // TODO: the need to fully qualify the classname
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if (is_root_view) {
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dex::Value null = AcquireRegister();
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method_->BuildConst4(null, 0);
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method_->AddInstruction(dex::Instruction::InvokeVirtualObject(
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try_create_view_.id, view, inflater_, null, classname_tmp_, context_, attrs_));
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ReleaseRegister();
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} else {
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method_->AddInstruction(dex::Instruction::InvokeVirtualObject(
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try_create_view_.id, view, inflater_, GetCurrentView(), classname_tmp_, context_, attrs_));
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}
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auto label = method_->MakeLabel();
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// branch if not null
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method_->AddInstruction(
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dex::Instruction::OpWithArgs(dex::Instruction::Op::kBranchNEqz, /*dest=*/{}, view, label));
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// If null, create the class directly.
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method_->BuildNew(view,
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dex::TypeDescriptor::FromClassname(ResolveName(name)),
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dex::Prototype{dex::TypeDescriptor::Void(),
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dex::TypeDescriptor::FromClassname("android.content.Context"),
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dex::TypeDescriptor::FromClassname("android.util.AttributeSet")},
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context_,
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attrs_);
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method_->AddInstruction(
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dex::Instruction::OpWithArgs(dex::Instruction::Op::kBindLabel, /*dest=*/{}, label));
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if (is_viewgroup) {
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// Cast to a ViewGroup so we can add children later.
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const ir::Type* view_group_def = method_->dex_file()->GetOrAddType(
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dex::TypeDescriptor::FromClassname("android.view.ViewGroup").descriptor());
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method_->AddInstruction(dex::Instruction::Cast(view, dex::Value::Type(view_group_def->orig_index)));
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}
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if (!is_root_view) {
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// layout_params = parent.generateLayoutParams(attrs);
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dex::Value layout_params{AcquireRegister()};
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method_->AddInstruction(dex::Instruction::InvokeVirtualObject(
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generate_layout_params_.id, layout_params, GetCurrentView(), attrs_));
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view_stack_.push_back({view, layout_params});
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} else {
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view_stack_.push_back({view, {}});
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}
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}
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void DexViewBuilder::FinishView() {
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if (view_stack_.size() == 1) {
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method_->BuildReturn(GetCurrentView(), /*is_object=*/true);
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} else {
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// parent.add(view, layout_params)
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method_->AddInstruction(dex::Instruction::InvokeVirtual(
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add_view_.id, /*dest=*/{}, GetParentView(), GetCurrentView(), GetCurrentLayoutParams()));
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// xml.next(); // end tag
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method_->AddInstruction(dex::Instruction::InvokeInterface(xml_next_.id, {}, xml_));
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}
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PopViewStack();
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}
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dex::Value DexViewBuilder::AcquireRegister() {
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top_register_++;
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if (register_stack_.size() == top_register_) {
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register_stack_.push_back(method_->MakeRegister());
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}
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return register_stack_[top_register_];
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}
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void DexViewBuilder::ReleaseRegister() { top_register_--; }
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dex::Value DexViewBuilder::GetCurrentView() const { return view_stack_.back().view; }
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dex::Value DexViewBuilder::GetCurrentLayoutParams() const {
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return view_stack_.back().layout_params.value();
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}
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dex::Value DexViewBuilder::GetParentView() const {
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return view_stack_[view_stack_.size() - 2].view;
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}
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void DexViewBuilder::PopViewStack() {
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const auto& top = view_stack_.back();
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// release the layout params if we have them
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if (top.layout_params.has_value()) {
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ReleaseRegister();
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}
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// Unconditionally release the view register.
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ReleaseRegister();
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view_stack_.pop_back();
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}
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} // namespace startop
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