| /* |
| * 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 kTraceVarName[] = "_aidl_trace"; |
| 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 kTraceHeader[] = "utils/Trace.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)); |
| |
| if (interface.ShouldGenerateTraces()) { |
| b->AddLiteral( |
| StringPrintf("ScopedTrace %s(ATRACE_TAG_AIDL, \"%s::%s::cppClient\")", |
| kTraceVarName, interface.GetName().c_str(), method.GetName().c_str())); |
| } |
| |
| // 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 AidlInterface& interface, |
| 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()); |
| } |
| } |
| |
| if (interface.ShouldGenerateTraces()) { |
| b->AddStatement(new Statement(new MethodCall("atrace_begin", |
| ArgList{{"ATRACE_TAG_AIDL", |
| StringPrintf("\"%s::%s::cppServer\"", |
| interface.GetName().c_str(), |
| method.GetName().c_str())}}))); |
| } |
| |
| // 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))))); |
| |
| if (interface.ShouldGenerateTraces()) { |
| b->AddStatement(new Statement(new MethodCall("atrace_end", |
| "ATRACE_TAG_AIDL"))); |
| } |
| |
| // 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, interface, *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); |
| } |
| |
| if (interface.ShouldGenerateTraces()) { |
| includes.insert(kTraceHeader); |
| } |
| |
| 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 |
