1 files changed, 46 insertions, 0 deletions
diff --git a/binary_search_tool/ndk/switch_to_good.sh b/binary_search_tool/ndk/switch_to_good.sh
new file mode 100755
index 00000000..cb8d5fd9
--- /dev/null
+++ b/binary_search_tool/ndk/switch_to_good.sh
@@ -0,0 +1,46 @@
+#!/bin/bash -u
+#
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# This script is intended to be used by binary_search_state.py, as
+# part of the binary search triage on Android NDK apps. This script simply
+# deletes all given objects, signaling gradle to execute a recompilation of said
+# object files.
+#
+
+# Input is a file, with newline seperated list of files we will be switching
+OBJ_LIST_FILE=$1
+
+# Check that number of arguments == 1
+if [ $# -ne 1 ] ; then
+  echo "ERROR:"
+  echo "Got multiple inputs to switch script!"
+  echo "Run binary_search_state.py with --file_args"
+  exit 1
+fi
+
+# Remove any file that's being switched. This is because Gradle only recompiles
+# if:
+#   1. The resultant object file doesn't exist
+#   2. The hash of the source file has changed
+#
+# Because we have no reliable way to edit the source file, we instead remove the
+# object file and have the compiler wrapper insert the file from the appropriate
+# cache (good or bad).
+#
+# Not entirely relevant to the Teapot example, but something to consider:
+# This removing strategy has the side effect that all switched items cause the
+# invocation of the compiler wrapper, which can add up and slow the build
+# process. With Android's source tree, Make checks the timestamp of the object
+# file. So we symlink in the appropriate file and touch it to tell Make it needs
+# to be relinked. This avoids having to call the compiler wrapper in the
+# majority of cases.
+#
+# However, a similar construct doesn't seem to exist in Gradle. It may be better
+# to add a build target to Gradle that will always relink all given object
+# files. This way we can avoid calling the compiler wrapper while Triaging and
+# save some time. Not really necessary
+
+cat $OBJ_LIST_FILE | xargs rm
+exit 0
+