sandboxed-api/sandboxed_api/tools/clang_generator/generator.h

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// Copyright 2020 Google LLC
//
// 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
//
// https://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.
#ifndef SANDBOXED_API_TOOLS_CLANG_GENERATOR_GENERATOR_H_
#define SANDBOXED_API_TOOLS_CLANG_GENERATOR_GENERATOR_H_
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/container/flat_hash_set.h"
#include "absl/strings/string_view.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/Decl.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendAction.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Tooling/Tooling.h"
#include "sandboxed_api/tools/clang_generator/emitter.h"
#include "sandboxed_api/tools/clang_generator/types.h"
namespace sapi {
struct GeneratorOptions {
template <typename ContainerT>
GeneratorOptions& set_function_names(const ContainerT& value) {
function_names.clear();
function_names.insert(std::begin(value), std::end(value));
return *this;
}
template <typename ContainerT>
GeneratorOptions& set_in_files(const ContainerT& value) {
in_files.clear();
in_files.insert(std::begin(value), std::end(value));
return *this;
}
GeneratorOptions& set_limit_scan_depth(bool value) {
limit_scan_depth = value;
return *this;
}
bool has_namespace() const { return !namespace_name.empty(); }
absl::flat_hash_set<std::string> function_names;
absl::flat_hash_set<std::string> in_files;
bool limit_scan_depth = false;
// Output options
std::string work_dir;
std::string name; // Name of the Sandboxed API
std::string namespace_name; // Namespace to wrap the SAPI in
// Output path of the generated header. Used to build the header include
// guard.
std::string out_file = "out_file.cc";
std::string embed_dir; // Directory with embedded includes
std::string embed_name; // Identifier of the embed object
};
class GeneratorASTVisitor
: public clang::RecursiveASTVisitor<GeneratorASTVisitor> {
public:
explicit GeneratorASTVisitor(const GeneratorOptions& options)
: options_(options) {}
bool VisitTypeDecl(clang::TypeDecl* decl);
bool VisitFunctionDecl(clang::FunctionDecl* decl);
TypeCollector& collector() { return collector_; }
const std::vector<clang::FunctionDecl*>& functions() const {
return functions_;
}
private:
TypeCollector collector_;
std::vector<clang::FunctionDecl*> functions_;
const GeneratorOptions& options_;
};
class GeneratorASTConsumer : public clang::ASTConsumer {
public:
GeneratorASTConsumer(std::string in_file, Emitter& emitter,
const GeneratorOptions& options)
: in_file_(std::move(in_file)), visitor_(options), emitter_(emitter) {}
private:
void HandleTranslationUnit(clang::ASTContext& context) override;
std::string in_file_;
GeneratorASTVisitor visitor_;
Emitter& emitter_;
};
class GeneratorAction : public clang::ASTFrontendAction {
public:
GeneratorAction(Emitter& emitter, const GeneratorOptions& options)
: emitter_(emitter), options_(options) {}
private:
std::unique_ptr<clang::ASTConsumer> CreateASTConsumer(
clang::CompilerInstance&, llvm::StringRef in_file) override {
return std::make_unique<GeneratorASTConsumer>(std::string(in_file),
emitter_, options_);
}
bool BeginSourceFileAction(clang::CompilerInstance& ci) override {
ci.getPreprocessor().enableIncrementalProcessing();
return true;
}
bool hasCodeCompletionSupport() const override { return false; }
Emitter& emitter_;
const GeneratorOptions& options_;
};
class GeneratorFactory : public clang::tooling::FrontendActionFactory {
public:
// Does not take ownership
GeneratorFactory(Emitter& emitter, const GeneratorOptions& options)
: emitter_(emitter), options_(options) {}
private:
#if LLVM_VERSION_MAJOR >= 10
std::unique_ptr<clang::FrontendAction> create() override {
return std::make_unique<GeneratorAction>(emitter_, options_);
}
#else
clang::FrontendAction* create() override {
return new GeneratorAction(emitter_, options_);
}
#endif
bool runInvocation(
std::shared_ptr<clang::CompilerInvocation> invocation,
clang::FileManager* files,
std::shared_ptr<clang::PCHContainerOperations> pch_container_ops,
clang::DiagnosticConsumer* diag_consumer) override;
Emitter& emitter_;
const GeneratorOptions& options_;
};
std::string GetOutputFilename(absl::string_view source_file);
inline absl::string_view ToStringView(llvm::StringRef ref) {
return absl::string_view(ref.data(), ref.size());
}
} // namespace sapi
#endif // SANDBOXED_API_TOOLS_CLANG_GENERATOR_GENERATOR_H_