llvm-utils.h

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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