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/*
* 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.
*/
#include "dex_layout_compiler.h"
#include "layout_validation.h"
#include "android-base/stringprintf.h"
namespace startop {
using android::base::StringPrintf;
DexViewBuilder::DexViewBuilder(dex::MethodBuilder* method)
: method_{method},
context_{dex::Value::Parameter(0)},
resid_{dex::Value::Parameter(1)},
inflater_{method->MakeRegister()},
xml_{method->MakeRegister()},
attrs_{method->MakeRegister()},
classname_tmp_{method->MakeRegister()},
xml_next_{method->dex_file()->GetOrDeclareMethod(
dex::TypeDescriptor::FromClassname("android.content.res.XmlResourceParser"), "next",
dex::Prototype{dex::TypeDescriptor::Int()})},
try_create_view_{method->dex_file()->GetOrDeclareMethod(
dex::TypeDescriptor::FromClassname("android.view.LayoutInflater"), "tryCreateView",
dex::Prototype{dex::TypeDescriptor::FromClassname("android.view.View"),
dex::TypeDescriptor::FromClassname("android.view.View"),
dex::TypeDescriptor::FromClassname("java.lang.String"),
dex::TypeDescriptor::FromClassname("android.content.Context"),
dex::TypeDescriptor::FromClassname("android.util.AttributeSet")})},
generate_layout_params_{method->dex_file()->GetOrDeclareMethod(
dex::TypeDescriptor::FromClassname("android.view.ViewGroup"), "generateLayoutParams",
dex::Prototype{dex::TypeDescriptor::FromClassname("android.view.ViewGroup$LayoutParams"),
dex::TypeDescriptor::FromClassname("android.util.AttributeSet")})},
add_view_{method->dex_file()->GetOrDeclareMethod(
dex::TypeDescriptor::FromClassname("android.view.ViewGroup"), "addView",
dex::Prototype{
dex::TypeDescriptor::Void(),
dex::TypeDescriptor::FromClassname("android.view.View"),
dex::TypeDescriptor::FromClassname("android.view.ViewGroup$LayoutParams")})},
// The register stack starts with one register, which will be null for the root view.
register_stack_{{method->MakeRegister()}} {}
void DexViewBuilder::Start() {
dex::DexBuilder* const dex = method_->dex_file();
// LayoutInflater inflater = LayoutInflater.from(context);
auto layout_inflater_from = dex->GetOrDeclareMethod(
dex::TypeDescriptor::FromClassname("android.view.LayoutInflater"),
"from",
dex::Prototype{dex::TypeDescriptor::FromClassname("android.view.LayoutInflater"),
dex::TypeDescriptor::FromClassname("android.content.Context")});
method_->AddInstruction(
dex::Instruction::InvokeStaticObject(layout_inflater_from.id, /*dest=*/inflater_, context_));
// Resources res = context.getResources();
auto context_type = dex::TypeDescriptor::FromClassname("android.content.Context");
auto resources_type = dex::TypeDescriptor::FromClassname("android.content.res.Resources");
auto get_resources =
dex->GetOrDeclareMethod(context_type, "getResources", dex::Prototype{resources_type});
method_->AddInstruction(dex::Instruction::InvokeVirtualObject(get_resources.id, xml_, context_));
// XmlResourceParser xml = res.getLayout(resid);
auto xml_resource_parser_type =
dex::TypeDescriptor::FromClassname("android.content.res.XmlResourceParser");
auto get_layout =
dex->GetOrDeclareMethod(resources_type,
"getLayout",
dex::Prototype{xml_resource_parser_type, dex::TypeDescriptor::Int()});
method_->AddInstruction(dex::Instruction::InvokeVirtualObject(get_layout.id, xml_, xml_, resid_));
// AttributeSet attrs = Xml.asAttributeSet(xml);
auto as_attribute_set = dex->GetOrDeclareMethod(
dex::TypeDescriptor::FromClassname("android.util.Xml"),
"asAttributeSet",
dex::Prototype{dex::TypeDescriptor::FromClassname("android.util.AttributeSet"),
dex::TypeDescriptor::FromClassname("org.xmlpull.v1.XmlPullParser")});
method_->AddInstruction(dex::Instruction::InvokeStaticObject(as_attribute_set.id, attrs_, xml_));
// xml.next(); // start document
method_->AddInstruction(dex::Instruction::InvokeInterface(xml_next_.id, {}, xml_));
}
void DexViewBuilder::Finish() {}
namespace {
std::string ResolveName(const std::string& name) {
if (name == "View") return "android.view.View";
if (name == "ViewGroup") return "android.view.ViewGroup";
if (name.find(".") == std::string::npos) {
return StringPrintf("android.widget.%s", name.c_str());
}
return name;
}
} // namespace
void DexViewBuilder::StartView(const std::string& name, bool is_viewgroup) {
bool const is_root_view = view_stack_.empty();
// xml.next(); // start tag
method_->AddInstruction(dex::Instruction::InvokeInterface(xml_next_.id, {}, xml_));
dex::Value view = AcquireRegister();
// try to create the view using the factories
method_->BuildConstString(classname_tmp_,
name); // TODO: the need to fully qualify the classname
if (is_root_view) {
dex::Value null = AcquireRegister();
method_->BuildConst4(null, 0);
method_->AddInstruction(dex::Instruction::InvokeVirtualObject(
try_create_view_.id, view, inflater_, null, classname_tmp_, context_, attrs_));
ReleaseRegister();
} else {
method_->AddInstruction(dex::Instruction::InvokeVirtualObject(
try_create_view_.id, view, inflater_, GetCurrentView(), classname_tmp_, context_, attrs_));
}
auto label = method_->MakeLabel();
// branch if not null
method_->AddInstruction(
dex::Instruction::OpWithArgs(dex::Instruction::Op::kBranchNEqz, /*dest=*/{}, view, label));
// If null, create the class directly.
method_->BuildNew(view,
dex::TypeDescriptor::FromClassname(ResolveName(name)),
dex::Prototype{dex::TypeDescriptor::Void(),
dex::TypeDescriptor::FromClassname("android.content.Context"),
dex::TypeDescriptor::FromClassname("android.util.AttributeSet")},
context_,
attrs_);
method_->AddInstruction(
dex::Instruction::OpWithArgs(dex::Instruction::Op::kBindLabel, /*dest=*/{}, label));
if (is_viewgroup) {
// Cast to a ViewGroup so we can add children later.
const ir::Type* view_group_def = method_->dex_file()->GetOrAddType(
dex::TypeDescriptor::FromClassname("android.view.ViewGroup").descriptor());
method_->AddInstruction(dex::Instruction::Cast(view, dex::Value::Type(view_group_def->orig_index)));
}
if (!is_root_view) {
// layout_params = parent.generateLayoutParams(attrs);
dex::Value layout_params{AcquireRegister()};
method_->AddInstruction(dex::Instruction::InvokeVirtualObject(
generate_layout_params_.id, layout_params, GetCurrentView(), attrs_));
view_stack_.push_back({view, layout_params});
} else {
view_stack_.push_back({view, {}});
}
}
void DexViewBuilder::FinishView() {
if (view_stack_.size() == 1) {
method_->BuildReturn(GetCurrentView(), /*is_object=*/true);
} else {
// parent.add(view, layout_params)
method_->AddInstruction(dex::Instruction::InvokeVirtual(
add_view_.id, /*dest=*/{}, GetParentView(), GetCurrentView(), GetCurrentLayoutParams()));
// xml.next(); // end tag
method_->AddInstruction(dex::Instruction::InvokeInterface(xml_next_.id, {}, xml_));
}
PopViewStack();
}
dex::Value DexViewBuilder::AcquireRegister() {
top_register_++;
if (register_stack_.size() == top_register_) {
register_stack_.push_back(method_->MakeRegister());
}
return register_stack_[top_register_];
}
void DexViewBuilder::ReleaseRegister() { top_register_--; }
dex::Value DexViewBuilder::GetCurrentView() const { return view_stack_.back().view; }
dex::Value DexViewBuilder::GetCurrentLayoutParams() const {
return view_stack_.back().layout_params.value();
}
dex::Value DexViewBuilder::GetParentView() const {
return view_stack_[view_stack_.size() - 2].view;
}
void DexViewBuilder::PopViewStack() {
const auto& top = view_stack_.back();
// release the layout params if we have them
if (top.layout_params.has_value()) {
ReleaseRegister();
}
// Unconditionally release the view register.
ReleaseRegister();
view_stack_.pop_back();
}
} // namespace startop
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