src/cc/bpf_module.h

/*
 * Copyright (c) 2015 PLUMgrid, Inc.
 *
 * 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.
 */

#pragma once

#include <stdint.h>
#include <map>
#include <memory>
#include <string>
#include <vector>

namespace llvm {
class ExecutionEngine;
class LLVMContext;
class Module;
}

namespace ebpf {
class BPFTable;

namespace cc {
class CodegenLLVM;
class Parser;
}

class BPFModule {
 private:
  int init_engine();
  int parse();
  int finalize();
  void dump_ir();
  int load_file_module(std::unique_ptr<llvm::Module> *mod, const std::string &file, bool in_memory);
  int load_includes(const std::string &tmpfile);
  int load_cfile(const std::string &file, bool in_memory);
  int kbuild_flags(const char *uname_release, std::vector<std::string> *cflags);
 public:
  BPFModule(unsigned flags);
  ~BPFModule();
  int load(const std::string &filename, const std::string &proto_filename);
  int load_string(const std::string &text);
  uint8_t * start(const std::string &name) const;
  size_t size(const std::string &name) const;
  int table_fd(const std::string &name) const;
  char * license() const;
  unsigned kern_version() const;
 private:
  unsigned flags_;  // 0x1 for printing
  std::string filename_;
  std::string proto_filename_;
  std::unique_ptr<llvm::LLVMContext> ctx_;
  std::unique_ptr<llvm::ExecutionEngine> engine_;
  llvm::Module *mod_;
  std::unique_ptr<ebpf::cc::Parser> parser_;
  std::unique_ptr<ebpf::cc::Parser> proto_parser_;
  std::unique_ptr<ebpf::cc::CodegenLLVM> codegen_;
  std::map<std::string, std::tuple<uint8_t *, uintptr_t>> sections_;
  std::unique_ptr<std::map<std::string, BPFTable>> tables_;
};

}  // namespace ebpf