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ld-wrapper: Optimize expanding rpath
The time to expand rpath was proportional to the number of -L flags times the number of -l flags. Now it is proportional to their sum (assuming constant number of files in each directory in an -L flag). Issue reported by @nh2 at https://github.com/NixOS/nixpkgs/issues/27609#issuecomment-317916623
This commit is contained in:
Orivej Desh
parent
34c0ba498c
commit
4964b104b9
@ -1,4 +1,5 @@
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#! @shell@ -e
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shopt -s nullglob
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path_backup="$PATH"
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if [ -n "@coreutils_bin@" ]; then
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PATH="@coreutils_bin@/bin"
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@ -20,18 +21,19 @@ expandResponseParams "$@"
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if [ "$NIX_ENFORCE_PURITY" = 1 -a -n "$NIX_STORE" \
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-a \( -z "$NIX_IGNORE_LD_THROUGH_GCC" -o -z "$NIX_LDFLAGS_SET" \) ]; then
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rest=()
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n=0
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while [ $n -lt ${#params[*]} ]; do
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nParams=${#params[@]}
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declare -i n=0
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while [ $n -lt $nParams ]; do
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p=${params[n]}
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p2=${params[$((n+1))]}
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if [ "${p:0:3}" = -L/ ] && badPath "${p:2}"; then
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skip $p
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skip "${p:2}"
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elif [ "$p" = -L ] && badPath "$p2"; then
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n=$((n + 1)); skip $p2
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n+=1; skip "$p2"
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elif [ "$p" = -rpath ] && badPath "$p2"; then
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n=$((n + 1)); skip $p2
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n+=1; skip "$p2"
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elif [ "$p" = -dynamic-linker ] && badPath "$p2"; then
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n=$((n + 1)); skip $p2
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n+=1; skip "$p2"
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elif [ "${p:0:1}" = / ] && badPath "$p"; then
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# We cannot skip this; barf.
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echo "impure path \`$p' used in link" >&2
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@ -40,9 +42,9 @@ if [ "$NIX_ENFORCE_PURITY" = 1 -a -n "$NIX_STORE" \
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# Our ld is not built with sysroot support (Can we fix that?)
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:
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else
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rest=("${rest[@]}" "$p")
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rest+=("$p")
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fi
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n=$((n + 1))
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n+=1
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done
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params=("${rest[@]}")
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fi
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@ -50,7 +52,7 @@ fi
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LD=@prog@
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source @out@/nix-support/add-hardening.sh
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extra=(${hardeningLDFlags[@]})
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extra=("${hardeningLDFlags[@]}")
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extraBefore=()
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if [ -z "$NIX_LDFLAGS_SET" ]; then
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@ -60,122 +62,97 @@ fi
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extra+=($NIX_LDFLAGS_AFTER $NIX_LDFLAGS_HARDEN)
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declare -A rpaths
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declare -a libDirs
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declare -A libs
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relocatable=
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# Find all -L... switches for rpath, and relocatable flags for build id.
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if [ "$NIX_DONT_SET_RPATH" != 1 ] || [ "$NIX_SET_BUILD_ID" = 1 ]; then
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prev=
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for p in "${params[@]}" "${extra[@]}"; do
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case "$prev" in
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-L)
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libDirs+=("$p")
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;;
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-l)
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libs["lib${p}.so"]=1
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;;
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-dynamic-linker)
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# Ignore the dynamic linker argument, or it
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# will match *.so and be added to rpath.
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;;
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*)
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case "$p" in
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-L/*)
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libDirs+=("${p:2}")
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;;
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-l?*)
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libs["lib${p:2}.so"]=1
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;;
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"$NIX_STORE"/*.so | "$NIX_STORE"/*.so.*)
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# This is a direct reference to a shared library, so add
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# its directory to the rpath.
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dir="${p%/*}"
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if [ ! "${rpaths[$dir]}" ]; then
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rpaths["$dir"]=1
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extra+=(-rpath "$dir")
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fi
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;;
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-r | --relocatable | -i)
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relocatable=1
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esac
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;;
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esac
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prev="$p"
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done
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fi
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# Add all used dynamic libraries to the rpath.
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if [ "$NIX_DONT_SET_RPATH" != 1 ]; then
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declare -A libDirsSeen
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declare -a libDirs
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addToLibPath() {
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local path="$1"
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if [ "${path:0:1}" != / ]; then return 0; fi
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case "$path" in
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*..*|*./*|*/.*|*//*)
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local path2
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if path2=$(readlink -f "$path"); then
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path="$path2"
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fi
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;;
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esac
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if [[ -z ${libDirsSeen[$path]} ]]; then
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libDirs+=("$path")
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libDirsSeen[$path]=1
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fi
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}
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declare -A rpathsSeen
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declare -a rpaths
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addToRPath() {
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# If the path is not in the store, don't add it to the rpath.
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# This typically happens for libraries in /tmp that are later
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# copied to $out/lib. If not, we're screwed.
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if [ "${1:0:${#NIX_STORE}}" != "$NIX_STORE" ]; then return 0; fi
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if [[ -z ${rpathsSeen[$1]} ]]; then
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rpaths+=("$1")
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rpathsSeen[$1]=1
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fi
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}
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declare -a libs
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# First, find all -L... switches.
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allParams=("${params[@]}" ${extra[@]})
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n=0
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while [ $n -lt ${#allParams[*]} ]; do
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p=${allParams[n]}
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p2=${allParams[$((n+1))]}
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if [ "${p:0:3}" = -L/ ]; then
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addToLibPath ${p:2}
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elif [ "$p" = -L ]; then
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addToLibPath ${p2}
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n=$((n + 1))
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elif [ "$p" = -l ]; then
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libs+=(${p2})
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n=$((n + 1))
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elif [ "${p:0:2}" = -l ]; then
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libs+=(${p:2})
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elif [ "$p" = -dynamic-linker ]; then
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# Ignore the dynamic linker argument, or it
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# will get into the next 'elif'. We don't want
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# the dynamic linker path rpath to go always first.
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n=$((n + 1))
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elif [[ "$p" =~ ^[^-].*\.so($|\.) ]]; then
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# This is a direct reference to a shared library, so add
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# its directory to the rpath.
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path="$(dirname "$p")";
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addToRPath "${path}"
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fi
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n=$((n + 1))
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done
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# Second, for each directory in the library search path (-L...),
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# For each directory in the library search path (-L...),
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# see if it contains a dynamic library used by a -l... flag. If
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# so, add the directory to the rpath.
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# It's important to add the rpath in the order of -L..., so
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# the link time chosen objects will be those of runtime linking.
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for i in ${libDirs[@]}; do
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for j in ${libs[@]}; do
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if [ -f "$i/lib$j.so" ]; then
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addToRPath $i
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break
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for dir in "${libDirs[@]}"; do
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if [[ "$dir" =~ [/.][/.] ]] && dir2=$(readlink -f "$dir"); then
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dir="$dir2"
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fi
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if [ "${rpaths[$dir]}" ] || [[ "$dir" != "$NIX_STORE"/* ]]; then
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# If the path is not in the store, don't add it to the rpath.
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# This typically happens for libraries in /tmp that are later
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# copied to $out/lib. If not, we're screwed.
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continue
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fi
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for path in "$dir"/lib*.so; do
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file="${path##*/}"
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if [ "${libs[$file]}" ]; then
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libs["$file"]=
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if [ ! "${rpaths[$dir]}" ]; then
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rpaths["$dir"]=1
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extra+=(-rpath "$dir")
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fi
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fi
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done
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done
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# Finally, add `-rpath' switches.
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for i in ${rpaths[@]}; do
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extra+=(-rpath "$i")
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done
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fi
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# Only add --build-id if this is a final link. FIXME: should build gcc
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# with --enable-linker-build-id instead?
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if [ "$NIX_SET_BUILD_ID" = 1 ]; then
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for p in "${params[@]}"; do
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if [ "$p" = "-r" -o "$p" = "--relocatable" -o "$p" = "-i" ]; then
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relocatable=1
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break
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fi
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done
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if [ -z "$relocatable" ]; then
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extra+=(--build-id)
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fi
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if [ "$NIX_SET_BUILD_ID" = 1 ] && [ ! "$relocatable" ]; then
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extra+=(--build-id)
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fi
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# Optionally print debug info.
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if [ -n "$NIX_DEBUG" ]; then
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echo "original flags to @prog@:" >&2
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for i in "${params[@]}"; do
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echo " $i" >&2
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done
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echo "extra flags to @prog@:" >&2
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for i in ${extra[@]}; do
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echo " $i" >&2
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done
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echo "original flags to @prog@:" >&2
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printf " %q\n" "${params[@]}" >&2
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echo "extra flags to @prog@:" >&2
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printf " %q\n" "${extraBefore[@]}" "${extra[@]}" >&2
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fi
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if [ -n "$NIX_LD_WRAPPER_EXEC_HOOK" ]; then
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@ -183,4 +160,4 @@ if [ -n "$NIX_LD_WRAPPER_EXEC_HOOK" ]; then
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fi
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PATH="$path_backup"
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exec @prog@ ${extraBefore[@]} "${params[@]}" ${extra[@]}
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exec @prog@ "${extraBefore[@]}" "${params[@]}" "${extra[@]}"
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