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tools: bpftool: generate .dot graph from CFG information

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This patch let bpftool print .dot graph file into stdout.

This graph is generated by the following steps:

  - iterate through the function list.
  - generate basic-block(BB) definition for each BB in the function.
  - draw out edges to connect BBs.

This patch is the initial support, the layout and decoration of the .dot
graph could be improved.

Also, it will be useful if we could visualize some performance data from
static analysis.

Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiong Wang
2018-03-01 18:01:21 -08:00
committed by Alexei Starovoitov
parent 6e9eb7e3f8
commit efcef17a6d
3 changed files with 147 additions and 0 deletions
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52
tools/bpf/bpftool/xlated_dumper.c
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@@ -123,6 +123,37 @@ static void print_insn(struct bpf_verifier_env *env, const char *fmt, ...)
va_end(args);
}
static void
print_insn_for_graph(struct bpf_verifier_env *env, const char *fmt, ...)
{
char buf[64], *p;
va_list args;
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
p = buf;
while (*p != '\0') {
if (*p == '\n') {
memmove(p + 3, p, strlen(buf) + 1 - (p - buf));
/* Align each instruction dump row left. */
*p++ = '\\';
*p++ = 'l';
/* Output multiline concatenation. */
*p++ = '\\';
} else if (*p == '<' || *p == '>' || *p == '|' || *p == '&') {
memmove(p + 1, p, strlen(buf) + 1 - (p - buf));
/* Escape special character. */
*p++ = '\\';
}
p++;
}
printf("%s", buf);
}
static void print_insn_json(struct bpf_verifier_env *env, const char *fmt, ...)
{
unsigned int l = strlen(fmt);
@@ -284,3 +315,24 @@ void dump_xlated_plain(struct dump_data *dd, void *buf, unsigned int len,
}
}
}
void dump_xlated_for_graph(struct dump_data *dd, void *buf_start, void *buf_end,
unsigned int start_idx)
{
const struct bpf_insn_cbs cbs = {
.cb_print = print_insn_for_graph,
.cb_call = print_call,
.cb_imm = print_imm,
.private_data = dd,
};
struct bpf_insn *insn_start = buf_start;
struct bpf_insn *insn_end = buf_end;
struct bpf_insn *cur = insn_start;
for (; cur <= insn_end; cur++) {
printf("% 4d: ", (int)(cur - insn_start + start_idx));
print_bpf_insn(&cbs, NULL, cur, true);
if (cur != insn_end)
printf(" | ");
}
}