static inline int lua_get_funcdata()

in profiler/profile.bpf.c [69:103]

• 35 lines of code
• 8 McCabe index (conditional complexity)

static inline int lua_get_funcdata(struct bpf_perf_event_data *ctx, cTValue *frame, struct lua_stack_event *eventp, int level)
{
	if (!frame)
		return -1;
	GCfunc *fn = frame_func(frame);
	if (!fn)
		return -1;
	if (isluafunc(fn))
	{
		eventp->type = FUNC_TYPE_LUA;
		GCproto *pt = funcproto(fn);
		if (!pt)
			return -1;
		eventp->ffid = BPF_PROBE_READ_USER(pt, firstline);
		GCstr *name = proto_chunkname(pt); /* GCstr *name */
		const char *src = strdata(name);
		if (!src)
			return -1;
		bpf_probe_read_user_str(eventp->name, sizeof(eventp->name), src);
		bpf_printk("level= %d, fn_name=%s\n", level, eventp->name);
	}
	else if (iscfunc(fn))
	{
		eventp->type = FUNC_TYPE_C;
		eventp->funcp = BPF_PROBE_READ_USER(fn, c.f);
	}
	else if (isffunc(fn))
	{
		eventp->type = FUNC_TYPE_F;
		eventp->ffid = BPF_PROBE_READ_USER(fn, c.ffid);
	}
	eventp->level = level;
	bpf_perf_event_output(ctx, &lua_event_output, BPF_F_CURRENT_CPU, eventp, sizeof(*eventp));
	return 0;
}