#!/bin/sh -e

gofrontendrepo=https://code.google.com/p/gofrontend
gofrontendrev=0fde0b6a7eb2

gccrepo=svn://gcc.gnu.org/svn/gcc/trunk
gccrev=216268

gotoolsrepo=https://go.googlesource.com/tools
gotoolsrev=47f2109c640e97025f36c98610bd9782e815012e

tempdir=$(mktemp -d /tmp/update_third_party.XXXXXX)
gofrontenddir=$tempdir/gofrontend
gotoolsdir=$tempdir/go.tools

rm -rf third_party
mkdir -p third_party/gofrontend third_party/gotools

# --------------------- gofrontend ---------------------

hg clone -r $gofrontendrev $gofrontendrepo $gofrontenddir

cp -r $gofrontenddir/LICENSE $gofrontenddir/libgo third_party/gofrontend

# Apply a diff that eliminates use of the unnamed struct extension beyond what
# -fms-extensions supports.
(cd third_party/gofrontend && patch -p1) < libgo-noext.diff
find third_party/gofrontend -name '*.orig' -exec rm \{\} \;

# Remove GPL licensed files.
rm \
  third_party/gofrontend/libgo/testsuite/libgo.testmain/testmain.exp \
  third_party/gofrontend/libgo/testsuite/lib/libgo.exp \
  third_party/gofrontend/libgo/testsuite/config/default.exp

# --------------------- gcc ---------------------

# Some dependencies are stored in the gcc repository.
# TODO(pcc): Ask iant about mirroring these dependencies into gofrontend.

for f in config-ml.in depcomp install-sh ltmain.sh missing ; do
  svn cat -r $gccrev $gccrepo/$f > third_party/gofrontend/$f
done

mkdir -p third_party/gofrontend/include third_party/gofrontend/libgcc

# Copy in our versions of GCC files.
cp include/dwarf2.h third_party/gofrontend/include/
cp include/filenames.h third_party/gofrontend/include/
cp include/unwind-pe.h third_party/gofrontend/libgcc/

cp ../../autoconf/config.guess third_party/gofrontend/
cp ../../autoconf/config.sub third_party/gofrontend/

for d in libbacktrace libffi ; do
  svn export -r $gccrev $gccrepo/$d third_party/gofrontend/$d
done

# Remove GPL licensed files, and files that confuse our license check.
rm \
  third_party/gofrontend/libffi/ChangeLog \
  third_party/gofrontend/libffi/doc/libffi.texi \
  third_party/gofrontend/libffi/msvcc.sh \
  third_party/gofrontend/libffi/testsuite/lib/libffi.exp \
  third_party/gofrontend/libffi/testsuite/libffi.call/call.exp \
  third_party/gofrontend/libffi/testsuite/libffi.special/special.exp \
  third_party/gofrontend/libffi/testsuite/config/default.exp

# The build requires these files to exist.
touch \
  third_party/gofrontend/include/dwarf2.def \
  third_party/gofrontend/libffi/doc/libffi.texi

# --------------------- go.tools ---------------------

git clone $gotoolsrepo $gotoolsdir
(cd $gotoolsdir && git checkout $gotoolsrev)

cp -r $gotoolsdir/LICENSE $gotoolsdir/go third_party/gotools

# Vendor the go.tools repository.
find third_party/gotools -name '*.go' | xargs sed -i -e \
  's,"golang.org/x/tools/,"llvm.org/llgo/third_party/gotools/,g'

# Until the version skew between the "go" tool and the compiler is resolved,
# we patch out Go 1.4 specific code in go.tools.
sed -i -e '/go1\.4/ d' third_party/gotools/go/exact/go13.go
rm third_party/gotools/go/exact/go14.go

# --------------------- license check ---------------------

# We don't want any GPL licensed code without an autoconf/libtool
# exception, or any GPLv3 licensed code.

for i in `grep -lr 'General Public License' third_party` ; do
  if grep -q 'configuration script generated by Autoconf, you may include it under' $i || \
     grep -q 'is built using GNU Libtool, you may include this file under the' $i ; then
    :
  else
    echo "$i: license check failed"
    exit 1
  fi
done

if grep -qr GPLv3 third_party ; then
  echo "`grep -lr GPLv3 third_party`: license check failed"
  exit 1
fi

rm -rf $tempdir