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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,
* limitations under the License.
*/
#include "aidl_to_ndk.h"
#include "aidl_language.h"
#include "aidl_to_cpp_common.h"
#include "logging.h"
#include <android-base/strings.h>
#include <functional>
using ::android::base::Join;
using ::android::base::Split;
namespace android {
namespace aidl {
namespace ndk {
struct TypeInfo {
// name of the type in C++ output
std::string cpp_name;
// whether to prefer 'value type' over 'const&'
bool value_is_cheap;
std::function<void(const CodeGeneratorContext& c)> readParcelFunction;
std::function<void(const CodeGeneratorContext& c)> writeParcelFunction;
};
static std::function<void(const CodeGeneratorContext& c)> standardRead(const std::string& name) {
return [name](const CodeGeneratorContext& c) {
c.writer << "AParcel_read" << name << "(" << c.parcel << ", " << c.var << ")";
};
}
static std::function<void(const CodeGeneratorContext& c)> standardWrite(const std::string& name) {
return [name](const CodeGeneratorContext& c) {
c.writer << "AParcel_write" << name << "(" << c.parcel << ", " << c.var << ")";
};
}
// map from AIDL built-in type name to the corresponding Ndk type name
static map<std::string, TypeInfo> kNdkTypeInfoMap = {
{"void", {"void", true, nullptr, nullptr}},
{"boolean", {"bool", true, standardRead("Bool"), standardWrite("Bool")}},
{"byte", {"int8_t", true, standardRead("Byte"), standardWrite("Byte")}},
{"char", {"char16_t", true, standardRead("Char"), standardWrite("Char")}},
{"int", {"int32_t", true, standardRead("Int32"), standardWrite("Int32")}},
{"long", {"int64_t", true, standardRead("Int64"), standardWrite("Int64")}},
{"float", {"float", true, standardRead("Float"), standardWrite("Float")}},
{"double", {"double", true, standardRead("Double"), standardWrite("Double")}},
{"String",
{"std::string", false,
[](const CodeGeneratorContext& c) {
c.writer << "::ndk::AParcel_readString(" << c.parcel << ", " << c.var << ")";
},
[](const CodeGeneratorContext& c) {
c.writer << "::ndk::AParcel_writeString(" << c.parcel << ", " << c.var << ")";
}}},
// TODO(b/111445392) {"List", ""},
// TODO(b/111445392) {"Map", ""},
{"IBinder",
{"::ndk::SpAIBinder", false,
[](const CodeGeneratorContext& c) {
c.writer << "AParcel_readNullableStrongBinder(" << c.parcel << ", (" << c.var
<< ")->getR())";
},
[](const CodeGeneratorContext& c) {
c.writer << "AParcel_writeStrongBinder(" << c.parcel << ", " << c.var << ".get())";
}}},
// TODO(b/111445392) {"FileDescriptor", ""},
// TODO(b/111445392) {"CharSequence", ""},
};
std::string NdkFullClassName(const AidlDefinedType& type, cpp::ClassNames name) {
std::vector<std::string> pieces = {"::aidl"};
std::vector<std::string> package = type.GetSplitPackage();
pieces.insert(pieces.end(), package.begin(), package.end());
pieces.push_back(cpp::ClassName(type, name));
return Join(pieces, "::");
}
std::string NdkNameOf(const AidlTypenames& types, const AidlTypeSpecifier& aidl, StorageMode mode) {
CHECK(aidl.IsResolved()) << aidl.ToString();
// TODO(112664205): this is okay for some types
CHECK(!aidl.IsGeneric()) << aidl.ToString();
// TODO(112664205): need to support array types
CHECK(!aidl.IsArray()) << aidl.ToString();
const string aidl_name = aidl.GetName();
TypeInfo info;
if (AidlTypenames::IsBuiltinTypename(aidl_name)) {
auto it = kNdkTypeInfoMap.find(aidl_name);
CHECK(it != kNdkTypeInfoMap.end());
info = it->second;
} else {
const AidlDefinedType* type = types.TryGetDefinedType(aidl_name);
AIDL_FATAL_IF(type == nullptr, aidl_name) << "Unrecognized type.";
if (type->AsInterface() != nullptr) {
info = {"std::shared_ptr<" + NdkFullClassName(*type, cpp::ClassNames::INTERFACE) + ">", false,
nullptr, nullptr};
} else if (type->AsParcelable() != nullptr) {
info = {NdkFullClassName(*type, cpp::ClassNames::BASE), false, nullptr, nullptr};
} else {
AIDL_FATAL(aidl_name) << "Unrecognized type";
}
}
switch (mode) {
case StorageMode::STACK:
return info.cpp_name;
case StorageMode::ARGUMENT:
if (info.value_is_cheap) {
return info.cpp_name;
} else {
return "const " + info.cpp_name + "&";
}
case StorageMode::OUT_ARGUMENT:
return info.cpp_name + "*";
default:
AIDL_FATAL(aidl.GetName()) << "Unrecognized mode type: " << static_cast<int>(mode);
}
}
void WriteToParcelFor(const CodeGeneratorContext& c) {
const string aidl_name = c.type.GetName();
if (AidlTypenames::IsBuiltinTypename(aidl_name)) {
auto it = kNdkTypeInfoMap.find(aidl_name);
CHECK(it != kNdkTypeInfoMap.end());
const TypeInfo& info = it->second;
info.writeParcelFunction(c);
} else {
const AidlDefinedType* type = c.types.TryGetDefinedType(aidl_name);
AIDL_FATAL_IF(type == nullptr, "Unrecognized type: " + aidl_name);
if (type->AsInterface() != nullptr) {
c.writer << NdkFullClassName(*type, cpp::ClassNames::INTERFACE) << "::writeToParcel("
<< c.parcel << ", " << c.var << ")";
} else if (type->AsParcelable() != nullptr) {
c.writer << "(" << c.var << ").writeToParcel(" << c.parcel << ")";
} else {
AIDL_FATAL(aidl_name) << "Unrecognized type";
}
}
}
void ReadFromParcelFor(const CodeGeneratorContext& c) {
const string aidl_name = c.type.GetName();
if (AidlTypenames::IsBuiltinTypename(aidl_name)) {
auto it = kNdkTypeInfoMap.find(aidl_name);
CHECK(it != kNdkTypeInfoMap.end());
const TypeInfo& info = it->second;
info.readParcelFunction(c);
} else {
const AidlDefinedType* type = c.types.TryGetDefinedType(aidl_name);
AIDL_FATAL_IF(type == nullptr, "Unrecognized type: " + aidl_name);
const AidlInterface* interface = type->AsInterface();
if (interface != nullptr) {
c.writer << NdkFullClassName(*type, cpp::ClassNames::INTERFACE) << "::readFromParcel("
<< c.parcel << ", " << c.var << ")";
} else if (type->AsParcelable() != nullptr) {
c.writer << "(" << c.var << ")->readFromParcel(" << c.parcel << ")";
} else {
AIDL_FATAL(aidl_name) << "Unrecognized type";
}
}
}
std::string NdkArgListOf(const AidlTypenames& types, const AidlMethod& method) {
std::vector<std::string> method_arguments;
for (const auto& a : method.GetArguments()) {
StorageMode mode = a->IsOut() ? StorageMode::OUT_ARGUMENT : StorageMode::ARGUMENT;
std::string type = NdkNameOf(types, a->GetType(), mode);
std::string name = cpp::BuildVarName(*a);
method_arguments.emplace_back(type + " " + name);
}
if (method.GetType().GetName() != "void") {
std::string return_type = NdkNameOf(types, method.GetType(), StorageMode::OUT_ARGUMENT);
method_arguments.emplace_back(return_type + " _aidl_return");
}
return Join(method_arguments, ", ");
}
std::string NdkCallListFor(const AidlMethod& method) {
std::vector<std::string> method_arguments;
for (const auto& a : method.GetArguments()) {
std::string reference_prefix = a->IsOut() ? "&" : "";
std::string name = cpp::BuildVarName(*a);
method_arguments.emplace_back(reference_prefix + name);
}
if (method.GetType().GetName() != "void") {
method_arguments.emplace_back("&_aidl_return");
}
return Join(method_arguments, ", ");
}
std::string NdkMethodDecl(const AidlTypenames& types, const AidlMethod& method,
const std::string& clazz) {
std::string class_prefix = clazz.empty() ? "" : (clazz + "::");
return "::ndk::ScopedAStatus " + class_prefix + method.GetName() + "(" +
NdkArgListOf(types, method) + ")";
}
} // namespace ndk
} // namespace aidl
} // namespace android
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