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bpftool: Support printing opcodes and source file references in CFG

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Add support for displaying opcodes or/and file references (filepath,
line and column numbers) when dumping the control flow graphs of loaded
BPF programs with bpftool.

The filepaths in the records are absolute. To avoid blocks on the graph
to get too wide, we truncate them when they get too long (but we always
keep the entire file name). In the unlikely case where the resulting
file name is ambiguous, it remains possible to get the full path with a
regular dump (no CFG).

Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/r/20230405132120.59886-7-quentin@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Quentin Monnet
2023-04-05 14:21:19 +01:00
committed by Alexei Starovoitov
parent 9b79f02722
commit 7483a7a70a
7 changed files with 83 additions and 15 deletions
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2
tools/bpf/bpftool/main.h
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@@ -230,7 +230,7 @@ void btf_dump_linfo_plain(const struct btf *btf,
void btf_dump_linfo_json(const struct btf *btf,
const struct bpf_line_info *linfo, bool linum);
void btf_dump_linfo_dotlabel(const struct btf *btf,
const struct bpf_line_info *linfo);
const struct bpf_line_info *linfo, bool linum);
struct nlattr;
struct ifinfomsg;