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4cea3a9cb3
This is the core patch for supporting eBPF on-the-fly compiling, does
the following work:
1. Search clang compiler using search_program().
2. Run command template defined in llvm-bpf-cmd-template option in
[llvm] config section using read_from_pipe(). Patch of clang and
source code path is injected into shell command using environment
variable using force_set_env().
Commiter notice:
When building with DEBUG=1 we get a compiler error that gets fixed with
the same approach described in commit b236512280:
perf kmem: Fix compiler warning about may be accessing uninitialized variable
The last argument to strtok_r doesn't need to be initialized, its
just a placeholder to make this routine reentrant, but gcc doesn't know
about that and complains, breaking the build, fix it by setting it to
NULL.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/n/1436445342-1402-14-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/*
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* Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2015, Huawei Inc.
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*/
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#ifndef __LLVM_UTILS_H
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#define __LLVM_UTILS_H
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#include "debug.h"
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struct llvm_param {
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/* Path of clang executable */
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const char *clang_path;
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/*
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* Template of clang bpf compiling. 5 env variables
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* can be used:
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* $CLANG_EXEC: Path to clang.
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* $CLANG_OPTIONS: Extra options to clang.
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* $KERNEL_INC_OPTIONS: Kernel include directories.
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* $WORKING_DIR: Kernel source directory.
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* $CLANG_SOURCE: Source file to be compiled.
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*/
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const char *clang_bpf_cmd_template;
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/* Will be filled in $CLANG_OPTIONS */
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const char *clang_opt;
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/* Where to find kbuild system */
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const char *kbuild_dir;
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/*
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* Arguments passed to make, like 'ARCH=arm' if doing cross
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* compiling. Should not be used for dynamic compiling.
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*/
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const char *kbuild_opts;
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};
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extern struct llvm_param llvm_param;
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extern int perf_llvm_config(const char *var, const char *value);
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extern int llvm__compile_bpf(const char *path, void **p_obj_buf,
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size_t *p_obj_buf_sz);
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#endif
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