tools/perf/util/llvm-utils.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>
   4  * Copyright (C) 2015, Huawei Inc.
   5  */
   6 #ifndef __LLVM_UTILS_H
   7 #define __LLVM_UTILS_H
   8
   9 #include <stdbool.h>
  10
  11 struct llvm_param {
  12         /* Path of clang executable */
  13         const char *clang_path;
  14         /* Path of llc executable */
  15         const char *llc_path;
  16         /*
  17          * Template of clang bpf compiling. 5 env variables
  18          * can be used:
  19          *   $CLANG_EXEC:               Path to clang.
  20          *   $CLANG_OPTIONS:            Extra options to clang.
  21          *   $KERNEL_INC_OPTIONS:       Kernel include directories.
  22          *   $WORKING_DIR:              Kernel source directory.
  23          *   $CLANG_SOURCE:             Source file to be compiled.
  24          */
  25         const char *clang_bpf_cmd_template;
  26         /* Will be filled in $CLANG_OPTIONS */
  27         const char *clang_opt;
  28         /*
  29          * If present it'll add -emit-llvm to $CLANG_OPTIONS to pipe
  30          * the clang output to llc, useful for new llvm options not
  31          * yet selectable via 'clang -mllvm option', such as -mattr=dwarfris
  32          * in clang 6.0/llvm 7
  33          */
  34         const char *opts;
  35         /* Where to find kbuild system */
  36         const char *kbuild_dir;
  37         /*
  38          * Arguments passed to make, like 'ARCH=arm' if doing cross
  39          * compiling. Should not be used for dynamic compiling.
  40          */
  41         const char *kbuild_opts;
  42         /*
  43          * Default is false. If set to true, write compiling result
  44          * to object file.
  45          */
  46         bool dump_obj;
  47         /*
  48          * Default is false. If one of the above fields is set by user
  49          * explicitly then user_set_llvm is set to true. This is used
  50          * for perf test. If user doesn't set anything in .perfconfig
  51          * and clang is not found, don't trigger llvm test.
  52          */
  53         bool user_set_param;
  54 };
  55
  56 extern struct llvm_param llvm_param;
  57 int perf_llvm_config(const char *var, const char *value);
  58
  59 int llvm__compile_bpf(const char *path, void **p_obj_buf, size_t *p_obj_buf_sz);
  60
  61 /* This function is for test__llvm() use only */
  62 int llvm__search_clang(void);
  63
  64 /* Following functions are reused by builtin clang support */
  65 void llvm__get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts);
  66 int llvm__get_nr_cpus(void);
  67
  68 void llvm__dump_obj(const char *path, void *obj_buf, size_t size);
  69 #endif