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 70