1*795d594fSAndroid Build Coastguard WorkerBisection Bug Search 2*795d594fSAndroid Build Coastguard Worker==================== 3*795d594fSAndroid Build Coastguard Worker 4*795d594fSAndroid Build Coastguard WorkerBisection Bug Search is a tool for finding compiler optimizations bugs. It 5*795d594fSAndroid Build Coastguard Workeraccepts a program which exposes a bug by producing incorrect output and expected 6*795d594fSAndroid Build Coastguard Workeroutput for the program. It then attempts to narrow down the issue to a single 7*795d594fSAndroid Build Coastguard Workermethod and optimization pass under the assumption that interpreter is correct. 8*795d594fSAndroid Build Coastguard Worker 9*795d594fSAndroid Build Coastguard WorkerGiven methods in order M0..Mn finds smallest i such that compiling Mi and 10*795d594fSAndroid Build Coastguard Workerinterpreting all other methods produces incorrect output. Then, given ordered 11*795d594fSAndroid Build Coastguard Workeroptimization passes P0..Pl, finds smallest j such that compiling Mi with passes 12*795d594fSAndroid Build Coastguard WorkerP0..Pj-1 produces expected output and compiling Mi with passes P0..Pj produces 13*795d594fSAndroid Build Coastguard Workerincorrect output. Prints Mi and Pj. 14*795d594fSAndroid Build Coastguard Worker 15*795d594fSAndroid Build Coastguard WorkerHow to run Bisection Bug Search 16*795d594fSAndroid Build Coastguard Worker=============================== 17*795d594fSAndroid Build Coastguard Worker 18*795d594fSAndroid Build Coastguard WorkerThere are two supported invocation modes: 19*795d594fSAndroid Build Coastguard Worker 20*795d594fSAndroid Build Coastguard Worker1. Regular invocation, dalvikvm command is constructed internally: 21*795d594fSAndroid Build Coastguard Worker 22*795d594fSAndroid Build Coastguard Worker ./bisection_search.py -cp classes.dex --expected-output out_int --class Test 23*795d594fSAndroid Build Coastguard Worker 24*795d594fSAndroid Build Coastguard Worker2. Raw-cmd invocation, dalvikvm command is accepted as an argument. 25*795d594fSAndroid Build Coastguard Worker 26*795d594fSAndroid Build Coastguard Worker Extra dalvikvm arguments will be placed on second position in the command 27*795d594fSAndroid Build Coastguard Worker by default. {ARGS} tag can be used to specify a custom position. 28*795d594fSAndroid Build Coastguard Worker 29*795d594fSAndroid Build Coastguard Worker If used in device mode, the command has to exec a dalvikvm instance. Bisection 30*795d594fSAndroid Build Coastguard Worker will fail if pid of the process started by raw-cmd is different than pid of runtime. 31*795d594fSAndroid Build Coastguard Worker 32*795d594fSAndroid Build Coastguard Worker ./bisection_search.py --raw-cmd='run.sh -cp classes.dex Test' --expected-retcode SUCCESS 33*795d594fSAndroid Build Coastguard Worker ./bisection_search.py --raw-cmd='/bin/sh art {ARGS} -cp classes.dex Test' --expected-retcode SUCCESS 34*795d594fSAndroid Build Coastguard Worker 35*795d594fSAndroid Build Coastguard WorkerHelp: 36*795d594fSAndroid Build Coastguard Worker 37*795d594fSAndroid Build Coastguard Worker bisection_search.py [-h] [-cp CLASSPATH] [--class CLASSNAME] [--lib LIB] 38*795d594fSAndroid Build Coastguard Worker [--dalvikvm-option [OPT [OPT ...]]] [--arg [ARG [ARG ...]]] 39*795d594fSAndroid Build Coastguard Worker [--image IMAGE] [--raw-cmd RAW_CMD] 40*795d594fSAndroid Build Coastguard Worker [--64] [--device] [--device-serial DEVICE_SERIAL] 41*795d594fSAndroid Build Coastguard Worker [--expected-output EXPECTED_OUTPUT] 42*795d594fSAndroid Build Coastguard Worker [--expected-retcode {SUCCESS,TIMEOUT,ERROR}] 43*795d594fSAndroid Build Coastguard Worker [--check-script CHECK_SCRIPT] [--logfile LOGFILE] [--cleanup] 44*795d594fSAndroid Build Coastguard Worker [--timeout TIMEOUT] [--verbose] 45*795d594fSAndroid Build Coastguard Worker 46*795d594fSAndroid Build Coastguard Worker Tool for finding compiler bugs. Either --raw-cmd or both -cp and --class are required. 47*795d594fSAndroid Build Coastguard Worker 48*795d594fSAndroid Build Coastguard Worker optional arguments: 49*795d594fSAndroid Build Coastguard Worker -h, --help show this help message and exit 50*795d594fSAndroid Build Coastguard Worker 51*795d594fSAndroid Build Coastguard Worker dalvikvm command options: 52*795d594fSAndroid Build Coastguard Worker -cp CLASSPATH, --classpath CLASSPATH classpath 53*795d594fSAndroid Build Coastguard Worker --class CLASSNAME name of main class 54*795d594fSAndroid Build Coastguard Worker --lib LIB lib to use, default: libart.so 55*795d594fSAndroid Build Coastguard Worker --dalvikvm-option [OPT [OPT ...]] additional dalvikvm option 56*795d594fSAndroid Build Coastguard Worker --arg [ARG [ARG ...]] argument passed to test 57*795d594fSAndroid Build Coastguard Worker --image IMAGE path to image 58*795d594fSAndroid Build Coastguard Worker --raw-cmd RAW_CMD bisect with this command, ignore other command options 59*795d594fSAndroid Build Coastguard Worker 60*795d594fSAndroid Build Coastguard Worker bisection options: 61*795d594fSAndroid Build Coastguard Worker --64 x64 mode 62*795d594fSAndroid Build Coastguard Worker --device run on device 63*795d594fSAndroid Build Coastguard Worker --device-serial DEVICE_SERIAL device serial number, implies --device 64*795d594fSAndroid Build Coastguard Worker --expected-output EXPECTED_OUTPUT file containing expected output 65*795d594fSAndroid Build Coastguard Worker --expected-retcode {SUCCESS,TIMEOUT,ERROR} expected normalized return code 66*795d594fSAndroid Build Coastguard Worker --check-script CHECK_SCRIPT script comparing output and expected output 67*795d594fSAndroid Build Coastguard Worker --logfile LOGFILE custom logfile location 68*795d594fSAndroid Build Coastguard Worker --cleanup clean up after bisecting 69*795d594fSAndroid Build Coastguard Worker --timeout TIMEOUT if timeout seconds pass assume test failed 70*795d594fSAndroid Build Coastguard Worker --verbose enable verbose output 71