1 #!/bin/bash -u 2 # 3 # Copyright 2016 Google Inc. All Rights Reserved. 4 # 5 # This script is intended to be used by binary_search_state.py, as 6 # part of the binary search triage on Android NDK apps. This script simply 7 # deletes all given objects, signaling gradle to execute a recompilation of said 8 # object files. 9 # 10 11 # Input is a file, with newline seperated list of files we will be switching 12 OBJ_LIST_FILE=$1 13 14 # Check that number of arguments == 1 15 if [ $# -ne 1 ] ; then 16 echo "ERROR:" 17 echo "Got multiple inputs to switch script!" 18 echo "Run binary_search_state.py with --file_args" 19 exit 1 20 fi 21 22 # Remove any file that's being switched. This is because Gradle only recompiles 23 # if: 24 # 1. The resultant object file doesn't exist 25 # 2. The hash of the source file has changed 26 # 27 # Because we have no reliable way to edit the source file, we instead remove the 28 # object file and have the compiler wrapper insert the file from the appropriate 29 # cache (good or bad). 30 # 31 # Not entirely relevant to the Teapot example, but something to consider: 32 # This removing strategy has the side effect that all switched items cause the 33 # invocation of the compiler wrapper, which can add up and slow the build 34 # process. With Android's source tree, Make checks the timestamp of the object 35 # file. So we symlink in the appropriate file and touch it to tell Make it needs 36 # to be relinked. This avoids having to call the compiler wrapper in the 37 # majority of cases. 38 # 39 # However, a similar construct doesn't seem to exist in Gradle. It may be better 40 # to add a build target to Gradle that will always relink all given object 41 # files. This way we can avoid calling the compiler wrapper while Triaging and 42 # save some time. Not really necessary 43 44 cat $OBJ_LIST_FILE | xargs rm 45 exit 0 46 47
