1*387f9dfdSAndroid Build Coastguard Worker#!/usr/bin/env bcc-lua 2*387f9dfdSAndroid Build Coastguard Worker--[[ 3*387f9dfdSAndroid Build Coastguard WorkerCopyright 2016 GitHub, Inc 4*387f9dfdSAndroid Build Coastguard Worker 5*387f9dfdSAndroid Build Coastguard WorkerLicensed under the Apache License, Version 2.0 (the "License"); 6*387f9dfdSAndroid Build Coastguard Workeryou may not use this file except in compliance with the License. 7*387f9dfdSAndroid Build Coastguard WorkerYou may obtain a copy of the License at 8*387f9dfdSAndroid Build Coastguard Worker 9*387f9dfdSAndroid Build Coastguard Workerhttp://www.apache.org/licenses/LICENSE-2.0 10*387f9dfdSAndroid Build Coastguard Worker 11*387f9dfdSAndroid Build Coastguard WorkerUnless required by applicable law or agreed to in writing, software 12*387f9dfdSAndroid Build Coastguard Workerdistributed under the License is distributed on an "AS IS" BASIS, 13*387f9dfdSAndroid Build Coastguard WorkerWITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14*387f9dfdSAndroid Build Coastguard WorkerSee the License for the specific language governing permissions and 15*387f9dfdSAndroid Build Coastguard Workerlimitations under the License. 16*387f9dfdSAndroid Build Coastguard Worker]] 17*387f9dfdSAndroid Build Coastguard Worker 18*387f9dfdSAndroid Build Coastguard Workerlocal program = [[ 19*387f9dfdSAndroid Build Coastguard Worker#include <uapi/linux/ptrace.h> 20*387f9dfdSAndroid Build Coastguard Workerint trace_method(struct pt_regs *ctx) { 21*387f9dfdSAndroid Build Coastguard Worker uint64_t addr; 22*387f9dfdSAndroid Build Coastguard Worker bpf_usdt_readarg(2, ctx, &addr); 23*387f9dfdSAndroid Build Coastguard Worker 24*387f9dfdSAndroid Build Coastguard Worker char fn_name[128] = {}; 25*387f9dfdSAndroid Build Coastguard Worker bpf_probe_read_user(&fn_name, sizeof(fn_name), (void *)addr); 26*387f9dfdSAndroid Build Coastguard Worker 27*387f9dfdSAndroid Build Coastguard Worker bpf_trace_printk("%s(...)\n", fn_name); 28*387f9dfdSAndroid Build Coastguard Worker return 0; 29*387f9dfdSAndroid Build Coastguard Worker}; 30*387f9dfdSAndroid Build Coastguard Worker]] 31*387f9dfdSAndroid Build Coastguard Worker 32*387f9dfdSAndroid Build Coastguard Workerreturn function(BPF, util) 33*387f9dfdSAndroid Build Coastguard Worker if not arg[1] then 34*387f9dfdSAndroid Build Coastguard Worker print("usage: rubysyms.lua PID") 35*387f9dfdSAndroid Build Coastguard Worker return 36*387f9dfdSAndroid Build Coastguard Worker end 37*387f9dfdSAndroid Build Coastguard Worker 38*387f9dfdSAndroid Build Coastguard Worker local u = util.USDT:new{pid=tonumber(arg[1])} 39*387f9dfdSAndroid Build Coastguard Worker u:enable_probe{probe="method__entry", fn_name="trace_method"} 40*387f9dfdSAndroid Build Coastguard Worker 41*387f9dfdSAndroid Build Coastguard Worker local b = BPF:new{text=program, usdt=u} 42*387f9dfdSAndroid Build Coastguard Worker local pipe = b:pipe() 43*387f9dfdSAndroid Build Coastguard Worker while true do 44*387f9dfdSAndroid Build Coastguard Worker print(pipe:trace_fields()) 45*387f9dfdSAndroid Build Coastguard Worker end 46*387f9dfdSAndroid Build Coastguard Workerend 47