8309880: Add support for linking libffi on Windows and Mac

Co-authored-by: Aleksey Shipilev <shade@openjdk.org>
Co-authored-by: Jorn Vernee <jvernee@openjdk.org>
Reviewed-by: erikj

make/autoconf/lib-ffi.m4

@@ -57,7 +57,11 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBFFI],
 
     if test "x${with_libffi}" != x; then
       LIBFFI_LIB_PATH="${with_libffi}/lib"
+      if test "x${OPENJDK_TARGET_OS}" != "xwindows"; then
         LIBFFI_LIBS="-L${with_libffi}/lib -lffi"
+      else
+        LIBFFI_LIBS="${with_libffi}/lib/libffi.lib"
+      fi
       LIBFFI_CFLAGS="-I${with_libffi}/include"
       LIBFFI_FOUND=yes
     fi
@@ -67,7 +71,11 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBFFI],
     fi
     if test "x${with_libffi_lib}" != x; then
       LIBFFI_LIB_PATH="${with_libffi_lib}"
+      if test "x${OPENJDK_TARGET_OS}" != "xwindows"; then
         LIBFFI_LIBS="-L${with_libffi_lib} -lffi"
+      else
+        LIBFFI_LIBS="${with_libffi_lib}/libffi.lib"
+      fi
       LIBFFI_FOUND=yes
     fi
     # Do not try pkg-config if we have a sysroot set.
@@ -106,12 +114,13 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBFFI],
       AC_MSG_ERROR([Could not find libffi! $HELP_MSG])
     fi
 
-    AC_MSG_CHECKING([if libffi works])
     AC_LANG_PUSH(C)
     OLD_CFLAGS="$CFLAGS"
     CFLAGS="$CFLAGS $LIBFFI_CFLAGS"
     OLD_LIBS="$LIBS"
     LIBS="$LIBS $LIBFFI_LIBS"
+
+    AC_MSG_CHECKING([if libffi works])
     AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <ffi.h>],
         [
           ffi_call(NULL, NULL, NULL, NULL);
@@ -120,9 +129,6 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBFFI],
         [LIBFFI_WORKS=yes],
         [LIBFFI_WORKS=no]
     )
-    CFLAGS="$OLD_CFLAGS"
-    LIBS="$OLD_LIBS"
-    AC_LANG_POP(C)
     AC_MSG_RESULT([$LIBFFI_WORKS])
 
     if test "x$LIBFFI_WORKS" = xno; then
@@ -130,39 +136,71 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBFFI],
       AC_MSG_ERROR([Found libffi but could not link and compile with it. $HELP_MSG])
     fi
 
+    # Check if FFI_GO_CLOSURES is properly defined. On some distributions, notably MacOS AArch64,
+    # ffitarget.h (included from ffi.h) does not explicitly define FFI_GO_CLOSURES. This makes the
+    # further include of ffi.h trigger the "FFI_GO_CLOSURES is undefined" warning, which fails
+    # the build when warnings are fatal.
+    AC_MSG_CHECKING([for FFI_GO_CLOSURES definition])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+      #include <ffi.h>
+      #ifndef FFI_GO_CLOSURES
+      #error "FFI_GO_CLOSURES is not defined"
+      #endif
+      ][])],
+      [
+        AC_MSG_RESULT([yes])
+      ],
+      [
+        AC_MSG_RESULT([no, defining])
+        LIBFFI_CFLAGS="$LIBFFI_CFLAGS -DFFI_GO_CLOSURES=0"
+      ]
+    )
+
+    CFLAGS="$OLD_CFLAGS"
+    LIBS="$OLD_LIBS"
+    AC_LANG_POP(C)
+
     # Find the libffi.so.X to bundle
     if test "x${ENABLE_LIBFFI_BUNDLING}" = "xtrue"; then
+      if test "x${OPENJDK_TARGET_OS}" = "xmacosx"; then
+        LIBFFI_LIB_FILE_NAME=libffi.?.dylib
+      elif test "x${OPENJDK_TARGET_OS}" = "xwindows"; then
+        LIBFFI_LIB_FILE_NAME=libffi.dll
+      else
+        LIBFFI_LIB_FILE_NAME=libffi.so.?
+      fi
+
       AC_MSG_CHECKING([for libffi lib file location])
       if test "x${LIBFFI_LIB_PATH}" != x; then
-        if test -e ${LIBFFI_LIB_PATH}/libffi.so.?; then
+        if test -e ${LIBFFI_LIB_PATH}/${LIBFFI_LIB_FILE_NAME}; then
-          LIBFFI_LIB_FILE="${LIBFFI_LIB_PATH}/libffi.so.?"
+          LIBFFI_LIB_FILE="${LIBFFI_LIB_PATH}/${LIBFFI_LIB_FILE_NAME}"
         else
-          AC_MSG_ERROR([Could not locate libffi.so.? for bundling in ${LIBFFI_LIB_PATH}])
+          AC_MSG_ERROR([Could not locate ${LIBFFI_LIB_FILE_NAME} for bundling in ${LIBFFI_LIB_PATH}])
         fi
       else
         # If we don't have an explicit path, look in a few obvious places
         if test "x${OPENJDK_TARGET_CPU}" = "xx86"; then
-          if test -e ${SYSROOT}/usr/lib/libffi.so.? ; then
+          if test -e ${SYSROOT}/usr/lib/${LIBFFI_LIB_FILE_NAME} ; then
-            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib/libffi.so.?"
+            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib/${LIBFFI_LIB_FILE_NAME}"
-          elif test -e ${SYSROOT}/usr/lib/i386-linux-gnu/libffi.so.? ; then
+          elif test -e ${SYSROOT}/usr/lib/i386-linux-gnu/${LIBFFI_LIB_FILE_NAME} ; then
-            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib/i386-linux-gnu/libffi.so.?"
+            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib/i386-linux-gnu/${LIBFFI_LIB_FILE_NAME}"
           else
-            AC_MSG_ERROR([Could not locate libffi.so.? for bundling])
+            AC_MSG_ERROR([Could not locate ${LIBFFI_LIB_FILE_NAME} for bundling])
           fi
         elif test "x${OPENJDK_TARGET_CPU}" = "xx86_64" || test "x${OPENJDK_TARGET_CPU}" = "xaarch64"; then
-          if test -e ${SYSROOT}/usr/lib64/libffi.so.? ; then
+          if test -e ${SYSROOT}/usr/lib64/${LIBFFI_LIB_FILE_NAME} ; then
-            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib64/libffi.so.?"
+            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib64/${LIBFFI_LIB_FILE_NAME}"
-          elif test -e ${SYSROOT}/usr/lib/x86_64-linux-gnu/libffi.so.? ; then
+          elif test -e ${SYSROOT}/usr/lib/x86_64-linux-gnu/${LIBFFI_LIB_FILE_NAME} ; then
-            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib/x86_64-linux-gnu/libffi.so.?"
+            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib/x86_64-linux-gnu/${LIBFFI_LIB_FILE_NAME}"
           else
-            AC_MSG_ERROR([Could not locate libffi.so.? for bundling])
+            AC_MSG_ERROR([Could not locate ${LIBFFI_LIB_FILE_NAME} for bundling])
           fi
         else
           # Fallback on the default /usr/lib dir
-          if test -e ${SYSROOT}/usr/lib/libffi.so.? ; then
+          if test -e ${SYSROOT}/usr/lib/${LIBFFI_LIB_FILE_NAME} ; then
-            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib/libffi.so.?"
+            LIBFFI_LIB_FILE="${SYSROOT}/usr/lib/${LIBFFI_LIB_FILE_NAME}"
           else
-            AC_MSG_ERROR([Could not locate libffi.so.? for bundling])
+            AC_MSG_ERROR([Could not locate ${LIBFFI_LIB_FILE_NAME} for bundling])
           fi
         fi
       fi

make/devkit/createLibffiBundle.sh

@@ -38,6 +38,38 @@
 # Note that the libtool and texinfo packages are needed to build libffi
 # $ sudo apt install libtool texinfo
 
+# Note that while the build system supports linking against libffi on Windows (x64),
+# I couldn't get this script working with a Windows devkit, and instead had to manually create
+# a libffi bundle for Windows. The steps I took were as follows:
+#
+# 1. run 'x64 Native Tools Command Prompt for VS 2022'. After that, cl.exe and link.exe should be on path
+#
+# 2. in the same shell, run `ucrt64` (this is one of the shell environments that comes with MSYS2).
+#    This should carry over the environment set up by the VS dev prompt into the ucrt64 prompt.
+#
+# 3. then, in the libffi repo root folder:
+#   3.a run `autogen.sh`
+#   3.b run:
+# ```
+# bash configure \
+#   CC="/path/to/libffi/msvcc.sh -m64" \
+#   CXX="/path/to/libffi/msvcc.sh -m64" \
+#   CPPFLAGS="-DFFI_BUILDING_DLL" \
+#   --disable-docs \
+#   --prefix=<install dest>
+# ```
+# (`<install dest>` can be whatever you like. That's what you point `--with-libffi` to).
+#
+# 4. run `make install`. This should create the `<install dest>` directory with the files:
+#    `include/ffi.h`, `include/ffitarget.h`, `lib/libffi.dll`. It also creates a `lib/libffi.lib` file,
+#    but it is of the wrong file type, `DLL` rather than `LIBRARY`.
+#
+# 5. Manually create a working `.lib` file (in the <install dest>/lib dir):
+#   5.a use `dumpbin /exports libffi.dll` to get a list of exported symbols
+#   5.b put them in a `libffi.def` file: `EXPORTS` on the first line, then a symbol on each line following
+#   5.c run `lib /def:libffi.def /machine:x64 /out:libffi.lib` to create the right `.lib` file (`lib` is a visual studio tool)
+#
+
 LIBFFI_VERSION=3.4.2
 
 BUNDLE_NAME=libffi-$LIBFFI_VERSION.tar.gz
@@ -49,6 +81,7 @@ SRC_DIR="$OUTPUT_DIR/src"
 DOWNLOAD_DIR="$OUTPUT_DIR/download"
 INSTALL_DIR="$OUTPUT_DIR/install"
 IMAGE_DIR="$OUTPUT_DIR/image"
+OS_NAME=$(uname -s)
 
 USAGE="$0 <devkit dir>"
 
@@ -81,8 +114,33 @@ cd $LIBFFI_DIR
 if [ ! -e $LIBFFI_DIR/configure ]; then
   bash ./autogen.sh
 fi
+
+case $OS_NAME in
+  Linux)
+    CC=$DEVKIT_DIR/bin/gcc
+    CXX=$DEVKIT_DIR/bin/g++
+    # For Linux/x86 it's under /lib/ instead of /lib64/
+    LIB_FOLDER=lib64
+    LIB_NAME=libffi.so*
+    ;;
+  Darwin)
+    CC=$DEVKIT_DIR/Xcode/Contents/Developer/usr/bin/gcc
+    CXX=$DEVKIT_DIR/Xcode/Contents/Developer/usr/bin/gcc
+    LIB_FOLDER=lib
+    LIB_NAME=libffi.*.dylib
+    ;;
+  *)
+    echo " Unsupported OS: $OS_NAME"
+    exit 1
+    ;;
+esac
+
 # For Linux/x86, add --build=i686-pc-linux-gnu CFLAGS=-m32 CXXFLAGS=-m32 LDFLAGS=-m32
-bash ./configure --prefix=$INSTALL_DIR CC=$DEVKIT_DIR/bin/gcc CXX=$DEVKIT_DIR/bin/g++
+bash ./configure \
+  --disable-docs \
+  --prefix=$INSTALL_DIR \
+  CC=$CC \
+  CXX=$CXX
 
 # Run with nice to keep system usable during build.
 nice make $MAKE_ARGS install
@@ -90,10 +148,9 @@ nice make $MAKE_ARGS install
 mkdir -p $IMAGE_DIR
 # Extract what we need into an image
 if [ ! -e $IMAGE_DIR/lib/libffi.so ]; then
-  echo "Copying libffi.so* to image"
+  echo "Copying ${LIB_NAME} to image"
   mkdir -p $IMAGE_DIR/lib
-  # For Linux/x86 it's under /lib/ instead of /lib64/
+  cp -a $INSTALL_DIR/${LIB_FOLDER}/${LIB_NAME} $IMAGE_DIR/lib/
-  cp -a $INSTALL_DIR/lib64/libffi.so* $IMAGE_DIR/lib/
 fi
 if [ ! -e $IMAGE_DIR/include/ ]; then
   echo "Copying include to image"

make/modules/java.base/Lib.gmk

@@ -228,6 +228,7 @@ ifeq ($(ENABLE_FALLBACK_LINKER), true)
       LDFLAGS := $(LDFLAGS_JDKLIB) \
                  $(call SET_SHARED_LIBRARY_ORIGIN), \
       LIBS := $(LIBFFI_LIBS), \
+      LIBS_windows := $(LIBFFI_LIBS) ws2_32.lib, \
   ))
 
   TARGETS += $(BUILD_LIBFALLBACKLINKER)

src/hotspot/cpu/zero/globalDefinitions_zero.hpp

@@ -32,10 +32,6 @@
 
 #define SUPPORT_MONITOR_COUNT
 
-#ifdef __APPLE__
-#define FFI_GO_CLOSURES 0
-#endif
-
 #include <ffi.h>
 
 // Indicates whether the C calling conventions require that

src/java.base/share/native/libfallbackLinker/fallbackLinker.c

@@ -28,6 +28,7 @@
 #include <ffi.h>
 
 #include <errno.h>
+#include <stdint.h>
 #ifdef _WIN64
 #include <Windows.h>
 #include <Winsock2.h>

test/jdk/java/foreign/TestUpcallStack.java

@@ -25,6 +25,7 @@
  * @test
  * @enablePreview
  * @requires jdk.foreign.linker != "UNSUPPORTED"
+ * @requires (!(os.name == "Mac OS X" & os.arch == "aarch64") | jdk.foreign.linker != "FALLBACK")
  * @modules java.base/jdk.internal.foreign
  * @build NativeTestHelper CallGeneratorHelper TestUpcallBase
  *

test/jdk/java/foreign/arraystructs/TestArrayStructs.java

@@ -26,6 +26,7 @@
  * @enablePreview
  * @library ../
  * @requires jdk.foreign.linker != "UNSUPPORTED"
+ * @requires (!(os.name == "Mac OS X" & os.arch == "aarch64") | jdk.foreign.linker != "FALLBACK")
  * @modules java.base/jdk.internal.foreign
  * @run testng/othervm
  *   --enable-native-access=ALL-UNNAMED
@@ -39,6 +40,7 @@
  * @enablePreview
  * @library ../
  * @requires jdk.foreign.linker != "UNSUPPORTED"
+ * @requires (!(os.name == "Mac OS X" & os.arch == "aarch64") | jdk.foreign.linker != "FALLBACK")
  * @modules java.base/jdk.internal.foreign
  * @run testng/othervm
  *   --enable-native-access=ALL-UNNAMED