1 files changed, 104 insertions, 0 deletions
diff --git a/utils/llvm-targets/gen-data-layout.sh b/utils/llvm-targets/gen-data-layout.sh
new file mode 100755
index 0000000000..3d9ded1a51
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+++ b/utils/llvm-targets/gen-data-layout.sh
@@ -0,0 +1,104 @@
+#!/usr/bin/env bash
+#
+# llvm-target generator
+#
+# Author: Moritz Angermann <moritz.angermann@gmail.com>
+#
+# This file generates the `llvm-targets` file, which contains the
+# data-layout, cpu and attributes for the target.  This is done by
+# querying `clang` for the data-layout, cpu and attributes based
+# on a given target.
+#
+# To utilize it run it as
+#
+#  $ ./gen-data-layout.sh > llvm-targets
+#
+# Add missing targets to the list below to have them included in
+# llvm-targets file.
+
+# Target sets for which to generate the llvm-targets file
+TARGETS=(
+    # Windows x86
+    "i386-unknown-windows" "i686-unknown-windows" "x86_64-unknown-windows"
+
+    # Linux ARM
+    "arm-unknown-linux-gnueabihf" "armv6-unknown-linux-gnueabihf" "armv6l-unknown-linux-gnueabihf"
+    "armv7-unknown-linux-gnueabihf" "armv7a-unknown-linux-gnueabi" "armv7l-unknown-linux-gnueabihf"
+    "aarch64-unknown-linux-gnu" "aarch64-unknown-linux"
+    # Linux x86
+    "i386-unknown-linux-gnu" "i386-unknown-linux" "x86_64-unknown-linux-gnu" "x86_64-unknown-linux"
+    # Linux Android
+    "armv7-unknown-linux-androideabi" "aarch64-unknown-linux-android"
+
+    # QNX
+    "arm-unknown-nto-qnx-eabi"
+
+    # macOS
+    "i386-apple-darwin" "x86_64-apple-darwin"
+    # iOS
+    "armv7-apple-ios arm64-apple-ios" "i386-apple-ios x86_64-apple-ios"
+)
+
+# given the call to clang -c11 that clang --target -v generates,
+# parse the -target-cpu <CPU> and -target-feature <feature> from
+# the output.
+function get_cpu_and_attr() {
+    # echo $@
+    while [ "$#" -gt 0 ]; do
+        case "$1" in
+            -target-cpu) CPU=$2; shift 2;;
+            -target-feature)
+                # translate clang to opt/llc target features
+                case "$2" in
+                    # we don't have support in GHC for proper soft-float.
+                    # if we extend the `llvm-target` file to contain two
+                    # additional columns for opt and llc flags, we could
+                    # pass -float-abi=soft; However ghc will use float
+                    # registers unconditionally on arm, and as such true
+                    # soft float with the registerised llvm backend is
+                    # currently not possible.
+                    +soft-float-abi) shift 2;;
+                    *) ATTR+=("$2"); shift 2;;
+                esac
+                ;;
+            *) shift 1;;
+        esac
+    done
+}
+
+# first marker to discrimiate the first line being outputted.
+FST=1
+# a dummy file to use for the clang invocation.
+FILE=_____dummy.c
+touch $FILE
+
+for target in "${TARGETS[@]}"; do
+    # find the cpu and attributes emitte by clang for the given $target
+    CPU=""
+    ATTR=()
+    args=$(clang --target=$target -S $FILE -o /dev/null -v 2>&1 |grep $FILE)
+    get_cpu_and_attr $args
+
+    # find the data-layout from the llvm code emitted by clang.
+    dl=$(clang --target=$target -S $FILE -emit-llvm -o -|grep datalayout |awk -F\  '{ print $4 }')
+    # GNU and Apple/LLVM can't agree on the aarch64 target.
+    # aarch64-apple-ios, is understood by autotools but not by LLVM.
+    # arm64-apple-ios, is understood by LLVM, but not by autotools.
+    #
+    # therefore, while we query clang with arm64-apple-ios, we put
+    # aarch64-apple-ios into the llvm-target list, as that is what
+    # we have to configure ghc with --target with anyway.  Also we
+    # want to retain the GNU naming for compatibility with libraries
+    # that use autotools.
+    if [ "$target" == "arm64-apple-ios" ]; then
+       target="aarch64-apple-ios"
+    fi
+    if [ $FST -eq 1 ]; then
+        echo "[(\"${target}\", ($dl, \"$CPU\", \"${ATTR[*]}\"))"
+        FST=0
+    else
+        echo ",(\"${target}\", ($dl, \"$CPU\", \"${ATTR[*]}\"))"
+    fi
+done
+rm $FILE
+echo "]"