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PL286/system/tools/aidl/generate_cpp.cpp

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/*
* Copyright (C) 2015, 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 "generate_cpp.h"
#include <cctype>
#include <cstring>
#include <memory>
#include <random>
#include <set>
#include <string>
#include <android-base/stringprintf.h>
#include "aidl_language.h"
#include "ast_cpp.h"
#include "code_writer.h"
#include "logging.h"
#include "os.h"
using android::base::StringPrintf;
using std::string;
using std::unique_ptr;
using std::vector;
using std::set;
namespace android {
namespace aidl {
namespace cpp {
namespace internals {
namespace {
const char kAndroidStatusVarName[] = "_aidl_ret_status";
const char kCodeVarName[] = "_aidl_code";
const char kFlagsVarName[] = "_aidl_flags";
const char kDataVarName[] = "_aidl_data";
const char kErrorLabel[] = "_aidl_error";
const char kImplVarName[] = "_aidl_impl";
const char kReplyVarName[] = "_aidl_reply";
const char kReturnVarName[] = "_aidl_return";
const char kStatusVarName[] = "_aidl_status";
const char kAndroidParcelLiteral[] = "::android::Parcel";
const char kAndroidStatusLiteral[] = "::android::status_t";
const char kAndroidStatusOk[] = "::android::OK";
const char kBinderStatusLiteral[] = "::android::binder::Status";
const char kIBinderHeader[] = "binder/IBinder.h";
const char kIInterfaceHeader[] = "binder/IInterface.h";
const char kParcelHeader[] = "binder/Parcel.h";
const char kStatusHeader[] = "binder/Status.h";
const char kString16Header[] = "utils/String16.h";
const char kStrongPointerHeader[] = "utils/StrongPointer.h";
unique_ptr<AstNode> BreakOnStatusNotOk() {
IfStatement* ret = new IfStatement(new Comparison(
new LiteralExpression(kAndroidStatusVarName), "!=",
new LiteralExpression(kAndroidStatusOk)));
ret->OnTrue()->AddLiteral("break");
return unique_ptr<AstNode>(ret);
}
unique_ptr<AstNode> GotoErrorOnBadStatus() {
IfStatement* ret = new IfStatement(new Comparison(
new LiteralExpression(kAndroidStatusVarName), "!=",
new LiteralExpression(kAndroidStatusOk)));
ret->OnTrue()->AddLiteral(StringPrintf("goto %s", kErrorLabel));
return unique_ptr<AstNode>(ret);
}
unique_ptr<AstNode> ReturnOnStatusNotOk() {
IfStatement* ret = new IfStatement(new Comparison(
new LiteralExpression(kAndroidStatusVarName), "!=",
new LiteralExpression(kAndroidStatusOk)));
ret->OnTrue()->AddLiteral(StringPrintf("return %s", kAndroidStatusVarName));
return unique_ptr<AstNode>(ret);
}
string UpperCase(const std::string& s) {
string result = s;
for (char& c : result)
c = toupper(c);
return result;
}
string BuildVarName(const AidlArgument& a) {
string prefix = "out_";
if (a.GetDirection() & AidlArgument::IN_DIR) {
prefix = "in_";
}
return prefix + a.GetName();
}
ArgList BuildArgList(const TypeNamespace& types,
const AidlMethod& method,
bool for_declaration) {
// Build up the argument list for the server method call.
vector<string> method_arguments;
for (const unique_ptr<AidlArgument>& a : method.GetArguments()) {
string literal;
if (for_declaration) {
// Method declarations need types, pointers to out params, and variable
// names that match the .aidl specification.
const Type* type = a->GetType().GetLanguageType<Type>();
literal = type->CppType();
if (a->IsOut()) {
literal = literal + "*";
} else {
// We pass in parameters that are not primitives by const reference.
// Arrays of primitives are not primitives.
if (!type->IsCppPrimitive() || a->GetType().IsArray()) {
literal = "const " + literal + "&";
}
}
literal += " " + a->GetName();
} else {
if (a->IsOut()) { literal = "&"; }
literal += BuildVarName(*a);
}
method_arguments.push_back(literal);
}
const Type* return_type = method.GetType().GetLanguageType<Type>();
if (return_type != types.VoidType()) {
string literal;
if (for_declaration) {
literal = StringPrintf(
"%s* %s", return_type->CppType().c_str(),
kReturnVarName);
} else {
literal = string{"&"} + kReturnVarName;
}
method_arguments.push_back(literal);
}
return ArgList(method_arguments);
}
unique_ptr<Declaration> BuildMethodDecl(const AidlMethod& method,
const TypeNamespace& types,
bool for_interface) {
uint32_t modifiers = 0;
if (for_interface) {
modifiers |= MethodDecl::IS_VIRTUAL;
modifiers |= MethodDecl::IS_PURE_VIRTUAL;
} else {
modifiers |= MethodDecl::IS_OVERRIDE;
}
return unique_ptr<Declaration>{
new MethodDecl{kBinderStatusLiteral,
method.GetName(),
BuildArgList(types, method, true /* for method decl */),
modifiers}};
}
unique_ptr<CppNamespace> NestInNamespaces(
vector<unique_ptr<Declaration>> decls,
const vector<string>& package) {
if (package.empty()) {
// We should also be checking this before we get this far, but do it again
// for the sake of unit tests and meaningful errors.
LOG(FATAL) << "C++ generation requires a package declaration "
"for namespacing";
}
auto it = package.crbegin(); // Iterate over the namespaces inner to outer
unique_ptr<CppNamespace> inner{new CppNamespace{*it, std::move(decls)}};
++it;
for (; it != package.crend(); ++it) {
inner.reset(new CppNamespace{*it, std::move(inner)});
}
return inner;
}
unique_ptr<CppNamespace> NestInNamespaces(unique_ptr<Declaration> decl,
const vector<string>& package) {
vector<unique_ptr<Declaration>> decls;
decls.push_back(std::move(decl));
return NestInNamespaces(std::move(decls), package);
}
bool DeclareLocalVariable(const TypeNamespace& types, const AidlArgument& a,
StatementBlock* b) {
const Type* cpp_type = a.GetType().GetLanguageType<Type>();
if (!cpp_type) { return false; }
string type = cpp_type->CppType();
b->AddLiteral(type + " " + BuildVarName(a));
return true;
}
string ClassName(const AidlInterface& interface, ClassNames type) {
string c_name = interface.GetName();
if (c_name.length() >= 2 && c_name[0] == 'I' && isupper(c_name[1]))
c_name = c_name.substr(1);
switch (type) {
case ClassNames::CLIENT:
c_name = "Bp" + c_name;
break;
case ClassNames::SERVER:
c_name = "Bn" + c_name;
break;
case ClassNames::INTERFACE:
c_name = "I" + c_name;
break;
case ClassNames::BASE:
break;
}
return c_name;
}
string BuildHeaderGuard(const AidlInterface& interface,
ClassNames header_type) {
string class_name = ClassName(interface, header_type);
for (size_t i = 1; i < class_name.size(); ++i) {
if (isupper(class_name[i])) {
class_name.insert(i, "_");
++i;
}
}
string ret = StringPrintf("AIDL_GENERATED_%s_%s_H_",
interface.GetPackage().c_str(),
class_name.c_str());
for (char& c : ret) {
if (c == '.') {
c = '_';
}
c = toupper(c);
}
return ret;
}
unique_ptr<Declaration> DefineClientTransaction(const TypeNamespace& types,
const AidlInterface& interface,
const AidlMethod& method) {
const string i_name = ClassName(interface, ClassNames::INTERFACE);
const string bp_name = ClassName(interface, ClassNames::CLIENT);
unique_ptr<MethodImpl> ret{new MethodImpl{
kBinderStatusLiteral, bp_name, method.GetName(),
ArgList{BuildArgList(types, method, true /* for method decl */)}}};
StatementBlock* b = ret->GetStatementBlock();
// Declare parcels to hold our query and the response.
b->AddLiteral(StringPrintf("%s %s", kAndroidParcelLiteral, kDataVarName));
// Even if we're oneway, the transact method still takes a parcel.
b->AddLiteral(StringPrintf("%s %s", kAndroidParcelLiteral, kReplyVarName));
// Declare the status_t variable we need for error handling.
b->AddLiteral(StringPrintf("%s %s = %s", kAndroidStatusLiteral,
kAndroidStatusVarName,
kAndroidStatusOk));
// We unconditionally return a Status object.
b->AddLiteral(StringPrintf("%s %s", kBinderStatusLiteral, kStatusVarName));
// Add the name of the interface we're hoping to call.
b->AddStatement(new Assignment(
kAndroidStatusVarName,
new MethodCall(StringPrintf("%s.writeInterfaceToken",
kDataVarName),
"getInterfaceDescriptor()")));
b->AddStatement(GotoErrorOnBadStatus());
for (const auto& a: method.GetArguments()) {
const Type* type = a->GetType().GetLanguageType<Type>();
string var_name = ((a->IsOut()) ? "*" : "") + a->GetName();
var_name = type->WriteCast(var_name);
if (a->IsIn()) {
// Serialization looks roughly like:
// _aidl_ret_status = _aidl_data.WriteInt32(in_param_name);
// if (_aidl_ret_status != ::android::OK) { goto error; }
const string& method = type->WriteToParcelMethod();
b->AddStatement(new Assignment(
kAndroidStatusVarName,
new MethodCall(StringPrintf("%s.%s", kDataVarName, method.c_str()),
ArgList(var_name))));
b->AddStatement(GotoErrorOnBadStatus());
} else if (a->IsOut() && a->GetType().IsArray()) {
// Special case, the length of the out array is written into the parcel.
// _aidl_ret_status = _aidl_data.writeVectorSize(&out_param_name);
// if (_aidl_ret_status != ::android::OK) { goto error; }
b->AddStatement(new Assignment(
kAndroidStatusVarName,
new MethodCall(StringPrintf("%s.writeVectorSize", kDataVarName),
ArgList(var_name))));
b->AddStatement(GotoErrorOnBadStatus());
}
}
// Invoke the transaction on the remote binder and confirm status.
string transaction_code = StringPrintf(
"%s::%s", i_name.c_str(), UpperCase(method.GetName()).c_str());
vector<string> args = {transaction_code, kDataVarName,
StringPrintf("&%s", kReplyVarName)};
if (interface.IsOneway() || method.IsOneway()) {
args.push_back("::android::IBinder::FLAG_ONEWAY");
}
b->AddStatement(new Assignment(
kAndroidStatusVarName,
new MethodCall("remote()->transact",
ArgList(args))));
b->AddStatement(GotoErrorOnBadStatus());
if (!interface.IsOneway() && !method.IsOneway()) {
// Strip off the exception header and fail if we see a remote exception.
// _aidl_ret_status = _aidl_status.readFromParcel(_aidl_reply);
// if (_aidl_ret_status != ::android::OK) { goto error; }
// if (!_aidl_status.isOk()) { return _aidl_ret_status; }
b->AddStatement(new Assignment(
kAndroidStatusVarName,
StringPrintf("%s.readFromParcel(%s)", kStatusVarName, kReplyVarName)));
b->AddStatement(GotoErrorOnBadStatus());
IfStatement* exception_check = new IfStatement(
new LiteralExpression(StringPrintf("!%s.isOk()", kStatusVarName)));
b->AddStatement(exception_check);
exception_check->OnTrue()->AddLiteral(
StringPrintf("return %s", kStatusVarName));
}
// Type checking should guarantee that nothing below emits code until "return
// status" if we are a oneway method, so no more fear of accessing reply.
// If the method is expected to return something, read it first by convention.
const Type* return_type = method.GetType().GetLanguageType<Type>();
if (return_type != types.VoidType()) {
const string& method_call = return_type->ReadFromParcelMethod();
b->AddStatement(new Assignment(
kAndroidStatusVarName,
new MethodCall(StringPrintf("%s.%s", kReplyVarName,
method_call.c_str()),
ArgList(kReturnVarName))));
b->AddStatement(GotoErrorOnBadStatus());
}
for (const AidlArgument* a : method.GetOutArguments()) {
// Deserialization looks roughly like:
// _aidl_ret_status = _aidl_reply.ReadInt32(out_param_name);
// if (_aidl_status != ::android::OK) { goto _aidl_error; }
string method =
a->GetType().GetLanguageType<Type>()->ReadFromParcelMethod();
b->AddStatement(new Assignment(
kAndroidStatusVarName,
new MethodCall(StringPrintf("%s.%s", kReplyVarName,
method.c_str()),
ArgList(a->GetName()))));
b->AddStatement(GotoErrorOnBadStatus());
}
// If we've gotten to here, one of two things is true:
// 1) We've read some bad status_t
// 2) We've only read status_t == OK and there was no exception in the
// response.
// In both cases, we're free to set Status from the status_t and return.
b->AddLiteral(StringPrintf("%s:\n", kErrorLabel), false /* no semicolon */);
b->AddLiteral(
StringPrintf("%s.setFromStatusT(%s)", kStatusVarName,
kAndroidStatusVarName));
b->AddLiteral(StringPrintf("return %s", kStatusVarName));
return unique_ptr<Declaration>(ret.release());
}
} // namespace
unique_ptr<Document> BuildClientSource(const TypeNamespace& types,
const AidlInterface& interface) {
vector<string> include_list = {
HeaderFile(interface, ClassNames::CLIENT, false),
kParcelHeader
};
vector<unique_ptr<Declaration>> file_decls;
// The constructor just passes the IBinder instance up to the super
// class.
const string i_name = ClassName(interface, ClassNames::INTERFACE);
file_decls.push_back(unique_ptr<Declaration>{new ConstructorImpl{
ClassName(interface, ClassNames::CLIENT),
ArgList{StringPrintf("const ::android::sp<::android::IBinder>& %s",
kImplVarName)},
{ "BpInterface<" + i_name + ">(" + kImplVarName + ")" }}});
// Clients define a method per transaction.
for (const auto& method : interface.GetMethods()) {
unique_ptr<Declaration> m = DefineClientTransaction(
types, interface, *method);
if (!m) { return nullptr; }
file_decls.push_back(std::move(m));
}
return unique_ptr<Document>{new CppSource{
include_list,
NestInNamespaces(std::move(file_decls), interface.GetSplitPackage())}};
}
namespace {
bool HandleServerTransaction(const TypeNamespace& types,
const AidlMethod& method,
StatementBlock* b) {
// Declare all the parameters now. In the common case, we expect no errors
// in serialization.
for (const unique_ptr<AidlArgument>& a : method.GetArguments()) {
if (!DeclareLocalVariable(types, *a, b)) { return false; }
}
// Declare a variable to hold the return value.
const Type* return_type = method.GetType().GetLanguageType<Type>();
if (return_type != types.VoidType()) {
b->AddLiteral(StringPrintf(
"%s %s", return_type->CppType().c_str(),
kReturnVarName));
}
// Check that the client is calling the correct interface.
IfStatement* interface_check = new IfStatement(
new MethodCall(StringPrintf("%s.checkInterface",
kDataVarName), "this"),
true /* invert the check */);
b->AddStatement(interface_check);
interface_check->OnTrue()->AddStatement(
new Assignment(kAndroidStatusVarName, "::android::BAD_TYPE"));
interface_check->OnTrue()->AddLiteral("break");
// Deserialize each "in" parameter to the transaction.
for (const auto& a: method.GetArguments()) {
// Deserialization looks roughly like:
// _aidl_ret_status = _aidl_data.ReadInt32(&in_param_name);
// if (_aidl_ret_status != ::android::OK) { break; }
const Type* type = a->GetType().GetLanguageType<Type>();
const string& readMethod = type->ReadFromParcelMethod();
if (a->IsIn()) {
b->AddStatement(new Assignment{
kAndroidStatusVarName,
new MethodCall{string(kDataVarName) + "." + readMethod,
"&" + BuildVarName(*a)}});
b->AddStatement(BreakOnStatusNotOk());
} else if (a->IsOut() && a->GetType().IsArray()) {
// Special case, the length of the out array is written into the parcel.
// _aidl_ret_status = _aidl_data.resizeOutVector(&out_param_name);
// if (_aidl_ret_status != ::android::OK) { break; }
b->AddStatement(new Assignment{
kAndroidStatusVarName,
new MethodCall{string(kDataVarName) + ".resizeOutVector",
"&" + BuildVarName(*a)}});
b->AddStatement(BreakOnStatusNotOk());
}
}
// Call the actual method. This is implemented by the subclass.
vector<unique_ptr<AstNode>> status_args;
status_args.emplace_back(new MethodCall(
method.GetName(),
BuildArgList(types, method, false /* not for method decl */)));
b->AddStatement(new Statement(new MethodCall(
StringPrintf("%s %s", kBinderStatusLiteral, kStatusVarName),
ArgList(std::move(status_args)))));
// Write exceptions during transaction handling to parcel.
if (!method.IsOneway()) {
b->AddStatement(new Assignment(
kAndroidStatusVarName,
StringPrintf("%s.writeToParcel(%s)", kStatusVarName, kReplyVarName)));
b->AddStatement(BreakOnStatusNotOk());
IfStatement* exception_check = new IfStatement(
new LiteralExpression(StringPrintf("!%s.isOk()", kStatusVarName)));
b->AddStatement(exception_check);
exception_check->OnTrue()->AddLiteral("break");
}
// If we have a return value, write it first.
if (return_type != types.VoidType()) {
string writeMethod =
string(kReplyVarName) + "->" +
return_type->WriteToParcelMethod();
b->AddStatement(new Assignment{
kAndroidStatusVarName, new MethodCall{writeMethod,
ArgList{return_type->WriteCast(kReturnVarName)}}});
b->AddStatement(BreakOnStatusNotOk());
}
// Write each out parameter to the reply parcel.
for (const AidlArgument* a : method.GetOutArguments()) {
// Serialization looks roughly like:
// _aidl_ret_status = data.WriteInt32(out_param_name);
// if (_aidl_ret_status != ::android::OK) { break; }
const Type* type = a->GetType().GetLanguageType<Type>();
const string& writeMethod = type->WriteToParcelMethod();
b->AddStatement(new Assignment{
kAndroidStatusVarName,
new MethodCall{string(kReplyVarName) + "->" + writeMethod,
type->WriteCast(BuildVarName(*a))}});
b->AddStatement(BreakOnStatusNotOk());
}
return true;
}
} // namespace
unique_ptr<Document> BuildServerSource(const TypeNamespace& types,
const AidlInterface& interface) {
const string bn_name = ClassName(interface, ClassNames::SERVER);
vector<string> include_list{
HeaderFile(interface, ClassNames::SERVER, false),
kParcelHeader
};
unique_ptr<MethodImpl> on_transact{new MethodImpl{
kAndroidStatusLiteral, bn_name, "onTransact",
ArgList{{StringPrintf("uint32_t %s", kCodeVarName),
StringPrintf("const %s& %s", kAndroidParcelLiteral,
kDataVarName),
StringPrintf("%s* %s", kAndroidParcelLiteral, kReplyVarName),
StringPrintf("uint32_t %s", kFlagsVarName)}}
}};
// Declare the status_t variable
on_transact->GetStatementBlock()->AddLiteral(
StringPrintf("%s %s = %s", kAndroidStatusLiteral, kAndroidStatusVarName,
kAndroidStatusOk));
// Add the all important switch statement, but retain a pointer to it.
SwitchStatement* s = new SwitchStatement{kCodeVarName};
on_transact->GetStatementBlock()->AddStatement(s);
// The switch statement has a case statement for each transaction code.
for (const auto& method : interface.GetMethods()) {
StatementBlock* b = s->AddCase("Call::" + UpperCase(method->GetName()));
if (!b) { return nullptr; }
if (!HandleServerTransaction(types, *method, b)) { return nullptr; }
}
// The switch statement has a default case which defers to the super class.
// The superclass handles a few pre-defined transactions.
StatementBlock* b = s->AddCase("");
b->AddLiteral(StringPrintf(
"%s = ::android::BBinder::onTransact(%s, %s, "
"%s, %s)", kAndroidStatusVarName, kCodeVarName,
kDataVarName, kReplyVarName, kFlagsVarName));
// If we saw a null reference, we can map that to an appropriate exception.
IfStatement* null_check = new IfStatement(
new LiteralExpression(string(kAndroidStatusVarName) +
" == ::android::UNEXPECTED_NULL"));
on_transact->GetStatementBlock()->AddStatement(null_check);
null_check->OnTrue()->AddStatement(new Assignment(
kAndroidStatusVarName,
StringPrintf("%s::fromExceptionCode(%s::EX_NULL_POINTER)"
".writeToParcel(%s)",
kBinderStatusLiteral, kBinderStatusLiteral,
kReplyVarName)));
// Finally, the server's onTransact method just returns a status code.
on_transact->GetStatementBlock()->AddLiteral(
StringPrintf("return %s", kAndroidStatusVarName));
return unique_ptr<Document>{new CppSource{
include_list,
NestInNamespaces(std::move(on_transact), interface.GetSplitPackage())}};
}
unique_ptr<Document> BuildInterfaceSource(const TypeNamespace& /* types */,
const AidlInterface& interface) {
vector<string> include_list{
HeaderFile(interface, ClassNames::INTERFACE, false),
HeaderFile(interface, ClassNames::CLIENT, false),
};
string fq_name = ClassName(interface, ClassNames::INTERFACE);
if (!interface.GetPackage().empty()) {
fq_name = interface.GetPackage() + "." + fq_name;
}
vector<unique_ptr<Declaration>> decls;
unique_ptr<MacroDecl> meta_if{new MacroDecl{
"IMPLEMENT_META_INTERFACE",
ArgList{vector<string>{ClassName(interface, ClassNames::BASE),
'"' + fq_name + '"'}}}};
decls.push_back(std::move(meta_if));
for (const auto& constant: interface.GetStringConstants()) {
unique_ptr<MethodImpl> getter(new MethodImpl(
"const ::android::String16&",
ClassName(interface, ClassNames::INTERFACE),
constant->GetName(),
{}));
getter->GetStatementBlock()->AddLiteral(
StringPrintf("static const ::android::String16 value(%s)",
constant->GetValue().c_str()));
getter->GetStatementBlock()->AddLiteral("return value");
decls.push_back(std::move(getter));
}
return unique_ptr<Document>{new CppSource{
include_list,
NestInNamespaces(std::move(decls), interface.GetSplitPackage())}};
}
unique_ptr<Document> BuildClientHeader(const TypeNamespace& types,
const AidlInterface& interface) {
const string i_name = ClassName(interface, ClassNames::INTERFACE);
const string bp_name = ClassName(interface, ClassNames::CLIENT);
unique_ptr<ConstructorDecl> constructor{new ConstructorDecl{
bp_name,
ArgList{StringPrintf("const ::android::sp<::android::IBinder>& %s",
kImplVarName)},
ConstructorDecl::IS_EXPLICIT
}};
unique_ptr<ConstructorDecl> destructor{new ConstructorDecl{
"~" + bp_name,
ArgList{},
ConstructorDecl::IS_VIRTUAL | ConstructorDecl::IS_DEFAULT}};
vector<unique_ptr<Declaration>> publics;
publics.push_back(std::move(constructor));
publics.push_back(std::move(destructor));
for (const auto& method: interface.GetMethods()) {
publics.push_back(BuildMethodDecl(*method, types, false));
}
unique_ptr<ClassDecl> bp_class{
new ClassDecl{bp_name,
"::android::BpInterface<" + i_name + ">",
std::move(publics),
{}
}};
return unique_ptr<Document>{new CppHeader{
BuildHeaderGuard(interface, ClassNames::CLIENT),
{kIBinderHeader,
kIInterfaceHeader,
"utils/Errors.h",
HeaderFile(interface, ClassNames::INTERFACE, false)},
NestInNamespaces(std::move(bp_class), interface.GetSplitPackage())}};
}
unique_ptr<Document> BuildServerHeader(const TypeNamespace& /* types */,
const AidlInterface& interface) {
const string i_name = ClassName(interface, ClassNames::INTERFACE);
const string bn_name = ClassName(interface, ClassNames::SERVER);
unique_ptr<Declaration> on_transact{new MethodDecl{
kAndroidStatusLiteral, "onTransact",
ArgList{{StringPrintf("uint32_t %s", kCodeVarName),
StringPrintf("const %s& %s", kAndroidParcelLiteral,
kDataVarName),
StringPrintf("%s* %s", kAndroidParcelLiteral, kReplyVarName),
StringPrintf("uint32_t %s = 0", kFlagsVarName)}},
MethodDecl::IS_OVERRIDE
}};
std::vector<unique_ptr<Declaration>> publics;
publics.push_back(std::move(on_transact));
unique_ptr<ClassDecl> bn_class{
new ClassDecl{bn_name,
"::android::BnInterface<" + i_name + ">",
std::move(publics),
{}
}};
return unique_ptr<Document>{new CppHeader{
BuildHeaderGuard(interface, ClassNames::SERVER),
{"binder/IInterface.h",
HeaderFile(interface, ClassNames::INTERFACE, false)},
NestInNamespaces(std::move(bn_class), interface.GetSplitPackage())}};
}
unique_ptr<Document> BuildInterfaceHeader(const TypeNamespace& types,
const AidlInterface& interface) {
set<string> includes = { kIBinderHeader, kIInterfaceHeader,
kStatusHeader, kStrongPointerHeader };
for (const auto& method : interface.GetMethods()) {
for (const auto& argument : method->GetArguments()) {
const Type* type = argument->GetType().GetLanguageType<Type>();
type->GetHeaders(&includes);
}
const Type* return_type = method->GetType().GetLanguageType<Type>();
return_type->GetHeaders(&includes);
}
unique_ptr<ClassDecl> if_class{
new ClassDecl{ClassName(interface, ClassNames::INTERFACE),
"::android::IInterface"}};
if_class->AddPublic(unique_ptr<Declaration>{new MacroDecl{
"DECLARE_META_INTERFACE",
ArgList{vector<string>{ClassName(interface, ClassNames::BASE)}}}});
unique_ptr<Enum> constant_enum{new Enum{"", "int32_t"}};
for (const auto& constant : interface.GetIntConstants()) {
constant_enum->AddValue(
constant->GetName(), std::to_string(constant->GetValue()));
}
if (constant_enum->HasValues()) {
if_class->AddPublic(std::move(constant_enum));
}
if (!interface.GetStringConstants().empty()) {
includes.insert(kString16Header);
}
for (const auto& constant : interface.GetStringConstants()) {
unique_ptr<MethodDecl> getter(new MethodDecl(
"const ::android::String16&", constant->GetName(),
{}, MethodDecl::IS_STATIC));
if_class->AddPublic(std::move(getter));
}
if (!interface.GetMethods().empty()) {
unique_ptr<Enum> call_enum{new Enum{"Call"}};
for (const auto& method : interface.GetMethods()) {
// Each method gets an enum entry and pure virtual declaration.
if_class->AddPublic(BuildMethodDecl(*method, types, true));
call_enum->AddValue(
UpperCase(method->GetName()),
StringPrintf("::android::IBinder::FIRST_CALL_TRANSACTION + %d",
method->GetId()));
}
if_class->AddPublic(std::move(call_enum));
}
return unique_ptr<Document>{new CppHeader{
BuildHeaderGuard(interface, ClassNames::INTERFACE),
vector<string>(includes.begin(), includes.end()),
NestInNamespaces(std::move(if_class), interface.GetSplitPackage())}};
}
bool WriteHeader(const CppOptions& options,
const TypeNamespace& types,
const AidlInterface& interface,
const IoDelegate& io_delegate,
ClassNames header_type) {
unique_ptr<Document> header;
switch (header_type) {
case ClassNames::INTERFACE:
header = BuildInterfaceHeader(types, interface);
break;
case ClassNames::CLIENT:
header = BuildClientHeader(types, interface);
break;
case ClassNames::SERVER:
header = BuildServerHeader(types, interface);
break;
default:
LOG(FATAL) << "aidl internal error";
}
if (!header) {
LOG(ERROR) << "aidl internal error: Failed to generate header.";
return false;
}
const string header_path = options.OutputHeaderDir() + OS_PATH_SEPARATOR +
HeaderFile(interface, header_type);
unique_ptr<CodeWriter> code_writer(io_delegate.GetCodeWriter(header_path));
header->Write(code_writer.get());
const bool success = code_writer->Close();
if (!success) {
io_delegate.RemovePath(header_path);
}
return success;
}
} // namespace internals
using namespace internals;
string HeaderFile(const AidlInterface& interface,
ClassNames class_type,
bool use_os_sep) {
string file_path = interface.GetPackage();
for (char& c: file_path) {
if (c == '.') {
c = (use_os_sep) ? OS_PATH_SEPARATOR : '/';
}
}
if (!file_path.empty()) {
file_path += (use_os_sep) ? OS_PATH_SEPARATOR : '/';
}
file_path += ClassName(interface, class_type);
file_path += ".h";
return file_path;
}
bool GenerateCpp(const CppOptions& options,
const TypeNamespace& types,
const AidlInterface& interface,
const IoDelegate& io_delegate) {
auto interface_src = BuildInterfaceSource(types, interface);
auto client_src = BuildClientSource(types, interface);
auto server_src = BuildServerSource(types, interface);
if (!interface_src || !client_src || !server_src) {
return false;
}
if (!io_delegate.CreatedNestedDirs(options.OutputHeaderDir(),
interface.GetSplitPackage())) {
LOG(ERROR) << "Failed to create directory structure for headers.";
return false;
}
if (!WriteHeader(options, types, interface, io_delegate,
ClassNames::INTERFACE) ||
!WriteHeader(options, types, interface, io_delegate,
ClassNames::CLIENT) ||
!WriteHeader(options, types, interface, io_delegate,
ClassNames::SERVER)) {
return false;
}
unique_ptr<CodeWriter> writer = io_delegate.GetCodeWriter(
options.OutputCppFilePath());
interface_src->Write(writer.get());
client_src->Write(writer.get());
server_src->Write(writer.get());
const bool success = writer->Close();
if (!success) {
io_delegate.RemovePath(options.OutputCppFilePath());
}
return success;
}
} // namespace cpp
} // namespace aidl
} // namespace android