/*
   * Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>
   * Copyright (C) 2015, Huawei Inc.
   */
  #ifndef __LLVM_UTILS_H
  #define __LLVM_UTILS_H
  
  #include "debug.h"
  
  struct llvm_param {
  	/* Path of clang executable */
  	const char *clang_path;
  	/*
  	 * Template of clang bpf compiling. 5 env variables
  	 * can be used:
  	 *   $CLANG_EXEC:		Path to clang.
  	 *   $CLANG_OPTIONS:		Extra options to clang.
  	 *   $KERNEL_INC_OPTIONS:	Kernel include directories.
  	 *   $WORKING_DIR:		Kernel source directory.
  	 *   $CLANG_SOURCE:		Source file to be compiled.
  	 */
  	const char *clang_bpf_cmd_template;
  	/* Will be filled in $CLANG_OPTIONS */
  	const char *clang_opt;
  	/* Where to find kbuild system */
  	const char *kbuild_dir;
  	/*
  	 * Arguments passed to make, like 'ARCH=arm' if doing cross
  	 * compiling. Should not be used for dynamic compiling.
  	 */
  	const char *kbuild_opts;

  	/*

  	 * Default is false. If set to true, write compiling result
  	 * to object file.
  	 */
  	bool dump_obj;
  	/*

  	 * Default is false. If one of the above fields is set by user
  	 * explicitly then user_set_llvm is set to true. This is used
  	 * for perf test. If user doesn't set anything in .perfconfig
  	 * and clang is not found, don't trigger llvm test.
  	 */
  	bool user_set_param;

  };
  
  extern struct llvm_param llvm_param;

  int perf_llvm_config(const char *var, const char *value);

  int llvm__compile_bpf(const char *path, void **p_obj_buf, size_t *p_obj_buf_sz);

  
  /* This function is for test__llvm() use only */

  int llvm__search_clang(void);

  
  /* Following functions are reused by builtin clang support */
  void llvm__get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts);
  int llvm__get_nr_cpus(void);
  
  void llvm__dump_obj(const char *path, void *obj_buf, size_t size);

  #endif