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Diffstat (limited to 'bin/find-unused-defines.sh')
-rwxr-xr-x | bin/find-unused-defines.sh | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/bin/find-unused-defines.sh b/bin/find-unused-defines.sh new file mode 100755 index 000000000000..6c07de4aeea5 --- /dev/null +++ b/bin/find-unused-defines.sh @@ -0,0 +1,27 @@ +# +# This is a pretty brute-force approach. It takes several hours to run on a top-spec MacbookAir. +# It also produces some false positives, so it requires careful examination and testing of the results. +# +# Algorithm Summary: +# First we find all #defines, +# then we search for each of them in turn, +# and if we find only one instance of a #define, we print it out. +# +# Algorithm Detail: +# (1) find #defines, excluding the externals folder +# (2) extract just the constant name from the search results +# (3) trim blank lines +# (4) sort the results, mostly so I have an idea how far along the process is +# (5) for each result: +# (6) grep for the constant +# (7) use awk to to check if only one match for a given constant was found +# (8) if so, generate a sed command to remove the #define +# +git grep -P '^#define\s+\w+\s+\w' -- "[!e][!x][!t]*" \ + | cut -s -d ' ' -f 2 \ + | sed '/^$/d' \ + | sort \ + | xargs -Ixxx sh -c \ + "git grep -w 'xxx' | awk -f bin/find-unused-defines.awk -v p1=xxx && echo \"xxx\" 1>&2" + + |