natThrowable.cc: New file.

2000-01-14  Andrew Haley  <aph@cygnus.com>

	* java/lang/natThrowable.cc: New file.

	* java/lang/Throwable.java (fillInStackTrace): Make native.
	(printStackTrace): Call native method to do this.
	(Throwable): Call fillInStackTrace.
	(stackTrace): New variable.

	* include/jvm.h: Add _Jv_ThisExecutable functions.

	* prims.cc: (_Jv_execName): New variable.
	(catch_segv): Call fillInStackTrace.
	(catch_fpe): Ditto.
	(_Jv_ThisExecutable): New functions.
	(JvRunMain): Set the name of this executable.

	* Makefile.am: Add java/lang/natThrowable.cc.
	Add name-finder.cc.
	* Makefile.in: Rebuilt.

	* acconfig.h: Add HAVE_PROC_SELF_EXE.

	* configure.in: Force link with __frame_state_for in
	FORCELIBGCCSPEC.  Add new checks for backtrace.
	* include/config.h.in: Rebuilt.

	* name-finder.cc: New file.
	* include/name-finder.h: New file.

From-SVN: r31460

13 files changed, 731 insertions, 161 deletions

diff --git a/libjava/ChangeLog b/libjava/ChangeLog
index 8db6f2f..53f7788 100644
--- a/libjava/ChangeLog
+++ b/libjava/ChangeLog
@@ -1,3 +1,33 @@
+2000-01-14  Andrew Haley  <aph@cygnus.com>
+
+	* java/lang/natThrowable.cc: New file.
+
+	* java/lang/Throwable.java (fillInStackTrace): Make native.
+	(printStackTrace): Call native method to do this.
+	(Throwable): Call fillInStackTrace.
+	(stackTrace): New variable.
+	
+	* include/jvm.h: Add _Jv_ThisExecutable functions.
+	
+	* prims.cc: (_Jv_execName): New variable.
+	(catch_segv): Call fillInStackTrace.
+	(catch_fpe): Ditto.
+	(_Jv_ThisExecutable): New functions.
+	(JvRunMain): Set the name of this executable.
+
+	* Makefile.am: Add java/lang/natThrowable.cc.
+	Add name-finder.cc.
+	* Makefile.in: Rebuilt.
+
+	* acconfig.h: Add HAVE_PROC_SELF_EXE.
+
+	* configure.in: Force link with __frame_state_for in
+	FORCELIBGCCSPEC.  Add new checks for backtrace.
+	* include/config.h.in: Rebuilt.
+
+	* name-finder.cc: New file.
+	* include/name-finder.h: New file.
+	
 2000-01-16  Anthony Green  <green@cygnus.com>
 
 	* java/lang/StringBuffer.java (StringBuffer): Don't special case
diff --git a/libjava/Makefile.am b/libjava/Makefile.am
index d15784d..bc828ce 100644
--- a/libjava/Makefile.am
+++ b/libjava/Makefile.am
@@ -112,7 +112,7 @@ javao_files = $(java_source_files:.java=.lo) \
 libffi_files = `$(AR) t ../libffi/.libs/libffi.a 2>/dev/null | sed 's/\.o/\.lo/g' | sed 's/^/..\/libffi\//g'`
 
 libgcj_la_SOURCES = prims.cc jni.cc exception.cc \
-	resolve.cc defineclass.cc interpret.cc
+	resolve.cc defineclass.cc interpret.cc name-finder.cc
 EXTRA_libgcj_la_SOURCES = boehm.cc nogc.cc posix-threads.cc no-threads.cc \
 	$(c_source_files) $(java_source_files) $(built_java_source_files)
 libgcj_la_DEPENDENCIES = libgcj.zip $(javao_files) $(nat_files) \
@@ -804,6 +804,7 @@ java/lang/natRuntime.cc	\
 java/lang/natString.cc \
 java/lang/natSystem.cc \
 java/lang/natThread.cc \
+java/lang/natThrowable.cc \
 java/lang/reflect/natArray.cc \
 java/lang/reflect/natConstructor.cc \
 java/lang/reflect/natField.cc \
diff --git a/libjava/Makefile.in b/libjava/Makefile.in
index feb516d..26ee2e3 100644
--- a/libjava/Makefile.in
+++ b/libjava/Makefile.in
@@ -184,7 +184,7 @@ javao_files = $(java_source_files:.java=.lo) \
 libffi_files = `$(AR) t ../libffi/.libs/libffi.a 2>/dev/null | sed 's/\.o/\.lo/g' | sed 's/^/..\/libffi\//g'`
 
 libgcj_la_SOURCES = prims.cc jni.cc exception.cc \
-	resolve.cc defineclass.cc interpret.cc
+	resolve.cc defineclass.cc interpret.cc name-finder.cc
 
 EXTRA_libgcj_la_SOURCES = boehm.cc nogc.cc posix-threads.cc no-threads.cc \
 	$(c_source_files) $(java_source_files) $(built_java_source_files)
@@ -618,6 +618,7 @@ java/lang/natRuntime.cc	\
 java/lang/natString.cc \
 java/lang/natSystem.cc \
 java/lang/natThread.cc \
+java/lang/natThrowable.cc \
 java/lang/reflect/natArray.cc \
 java/lang/reflect/natConstructor.cc \
 java/lang/reflect/natField.cc \
@@ -699,7 +700,7 @@ libgcjdata_a_LIBADD =
 LTLIBRARIES =  $(toolexeclib_LTLIBRARIES)
 
 libgcj_la_OBJECTS =  prims.lo jni.lo exception.lo resolve.lo \
-defineclass.lo interpret.lo
+defineclass.lo interpret.lo name-finder.lo
 @NATIVE_TRUE@bin_PROGRAMS =  jv-convert$(EXEEXT) gij$(EXEEXT)
 @NATIVE_TRUE@@MAINTAINER_MODE_TRUE@noinst_PROGRAMS =  \
 @NATIVE_TRUE@@MAINTAINER_MODE_TRUE@gen-from-JIS$(EXEEXT)
@@ -923,8 +924,8 @@ DEP_FILES =  .deps/$(srcdir)/$(CONVERT_DIR)/gen-from-JIS.P \
 .deps/java/util/zip/ZipException.P .deps/java/util/zip/ZipFile.P \
 .deps/java/util/zip/ZipInputStream.P \
 .deps/java/util/zip/ZipOutputStream.P .deps/jni.P .deps/libgcjdata.P \
-.deps/no-threads.P .deps/nogc.P .deps/posix-threads.P .deps/prims.P \
-.deps/resolve.P
+.deps/name-finder.P .deps/no-threads.P .deps/nogc.P \
+.deps/posix-threads.P .deps/prims.P .deps/resolve.P
 SOURCES = $(libgcjdata_a_SOURCES) $(libgcj_la_SOURCES) $(EXTRA_libgcj_la_SOURCES) $(jv_convert_SOURCES) $(EXTRA_jv_convert_SOURCES) $(gij_SOURCES) $(EXTRA_gij_SOURCES) $(gen_from_JIS_SOURCES) $(EXTRA_gen_from_JIS_SOURCES)
 OBJECTS = $(libgcjdata_a_OBJECTS) $(libgcj_la_OBJECTS) $(jv_convert_OBJECTS) $(gij_OBJECTS) $(gen_from_JIS_OBJECTS)
 
diff --git a/libjava/acconfig.h b/libjava/acconfig.h
index ef2c513..75931b7 100644
--- a/libjava/acconfig.h
+++ b/libjava/acconfig.h
@@ -120,5 +120,8 @@
 /* Define if using setjmp/longjmp exceptions.  */
 #undef SJLJ_EXCEPTIONS
 
+/* Define if you have /proc/self/exe */
+#undef HAVE_PROC_SELF_EXE
+ 
 /* Define if getuid() and friends are missing.  */
 #undef NO_GETUID
diff --git a/libjava/configure b/libjava/configure
index 602829b..56183b8 100755
--- a/libjava/configure
+++ b/libjava/configure
@@ -2456,7 +2456,7 @@ fi
 
 FORCELIBGCCSPEC=
 if test "$ac_cv_prog_gnu_ld" = yes; then
-   FORCELIBGCCSPEC="-u __rethrow -lgcc"
+   FORCELIBGCCSPEC="-u __rethrow -u __frame_state_for -lgcc"
 fi   
 
 echo $ac_n "checking for data_start""... $ac_c" 1>&6
@@ -3224,16 +3224,147 @@ else
 fi
 done
 
+   for ac_func in backtrace fork execvp pipe
+do
+echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
+echo "configure:3231: checking for $ac_func" >&5
+if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 3236 "configure"
+#include "confdefs.h"
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $ac_func(); below.  */
+#include <assert.h>
+/* Override any gcc2 internal prototype to avoid an error.  */
+/* We use char because int might match the return type of a gcc2
+    builtin and then its argument prototype would still apply.  */
+char $ac_func();
+
+int main() {
+
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
+choke me
+#else
+$ac_func();
+#endif
+
+; return 0; }
+EOF
+if { (eval echo configure:3259: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+  rm -rf conftest*
+  eval "ac_cv_func_$ac_func=yes"
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_func_$ac_func=no"
+fi
+rm -f conftest*
+fi
+
+if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_func 1
+EOF
+ 
+else
+  echo "$ac_t""no" 1>&6
+fi
+done
+
+   for ac_hdr in execinfo.h unistd.h dlfcn.h
+do
+ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
+echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
+echo "configure:3287: checking for $ac_hdr" >&5
+if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 3292 "configure"
+#include "confdefs.h"
+#include <$ac_hdr>
+EOF
+ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
+{ (eval echo configure:3297: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
+if test -z "$ac_err"; then
+  rm -rf conftest*
+  eval "ac_cv_header_$ac_safe=yes"
+else
+  echo "$ac_err" >&5
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_header_$ac_safe=no"
+fi
+rm -f conftest*
+fi
+if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_hdr=HAVE_`echo $ac_hdr | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_hdr 1
+EOF
+ 
+else
+  echo "$ac_t""no" 1>&6
+fi
+done
+ 
+   for ac_file in /proc/self/exe
+do
+
+ac_safe=`echo "$ac_file" | sed 'y%./+-%__p_%'`
+echo $ac_n "checking for $ac_file""... $ac_c" 1>&6
+echo "configure:3328: checking for $ac_file" >&5
+if eval "test \"`echo '$''{'ac_cv_file_$ac_safe'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test "$cross_compiling" = yes; then
+    { echo "configure: error: Cannot check for file existence when cross compiling" 1>&2; exit 1; }
+else
+  if test -r $ac_file; then
+    eval "ac_cv_file_$ac_safe=yes"
+  else
+    eval "ac_cv_file_$ac_safe=no"
+  fi
+fi
+fi
+if eval "test \"`echo '$ac_cv_file_'$ac_safe`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_file=HAVE_`echo $ac_file | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_file 1
+EOF
+ 
+     cat >> confdefs.h <<\EOF
+#define HAVE_PROC_SELF_EXE 1
+EOF
+
+else
+  echo "$ac_t""no" 1>&6
+
+fi
+done
+
 
    for ac_func in gethostbyname_r
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3232: checking for $ac_func" >&5
+echo "configure:3363: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3237 "configure"
+#line 3368 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3256,7 +3387,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3260: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3391: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3283,7 +3414,7 @@ EOF
      # We look for the one that returns `int'.
      # Hopefully this check is robust enough.
      cat > conftest.$ac_ext <<EOF
-#line 3287 "configure"
+#line 3418 "configure"
 #include "confdefs.h"
 #include <netdb.h>
 EOF
@@ -3303,7 +3434,7 @@ rm -f conftest*
      *" -D_REENTRANT "*) ;;
      *)
 		echo $ac_n "checking whether gethostbyname_r declaration requires -D_REENTRANT""... $ac_c" 1>&6
-echo "configure:3307: checking whether gethostbyname_r declaration requires -D_REENTRANT" >&5
+echo "configure:3438: checking whether gethostbyname_r declaration requires -D_REENTRANT" >&5
 if eval "test \"`echo '$''{'libjava_cv_gethostbyname_r_needs_reentrant'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3316,14 +3447,14 @@ ac_link='${CXX-g++} -o conftest${ac_exeext} $CXXFLAGS $CPPFLAGS $LDFLAGS conftes
 cross_compiling=$ac_cv_prog_cxx_cross
 
 	  cat > conftest.$ac_ext <<EOF
-#line 3320 "configure"
+#line 3451 "configure"
 #include "confdefs.h"
 #include <netdb.h>
 int main() {
 gethostbyname_r("", 0, 0);
 ; return 0; }
 EOF
-if { (eval echo configure:3327: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3458: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   libjava_cv_gethostbyname_r_needs_reentrant=no
 else
@@ -3333,14 +3464,14 @@ else
   		CPPFLAGS_SAVE="$CPPFLAGS"
 		CPPFLAGS="$CPPFLAGS -D_REENTRANT"
 		cat > conftest.$ac_ext <<EOF
-#line 3337 "configure"
+#line 3468 "configure"
 #include "confdefs.h"
 #include <netdb.h>
 int main() {
 gethostbyname_r("", 0, 0);
 ; return 0; }
 EOF
-if { (eval echo configure:3344: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3475: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   libjava_cv_gethostbyname_r_needs_reentrant=yes
 else
@@ -3375,12 +3506,12 @@ EOF
      esac
 
      echo $ac_n "checking for struct hostent_data""... $ac_c" 1>&6
-echo "configure:3379: checking for struct hostent_data" >&5
+echo "configure:3510: checking for struct hostent_data" >&5
 if eval "test \"`echo '$''{'libjava_cv_struct_hostent_data'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   	cat > conftest.$ac_ext <<EOF
-#line 3384 "configure"
+#line 3515 "configure"
 #include "confdefs.h"
 
 #if GETHOSTBYNAME_R_NEEDS_REENTRANT && !defined(_REENTRANT)
@@ -3391,7 +3522,7 @@ int main() {
 struct hostent_data data;
 ; return 0; }
 EOF
-if { (eval echo configure:3395: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3526: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   libjava_cv_struct_hostent_data=yes
 else
@@ -3420,12 +3551,12 @@ done
    for ac_func in gethostbyaddr_r
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3424: checking for $ac_func" >&5
+echo "configure:3555: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3429 "configure"
+#line 3560 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3448,7 +3579,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3452: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3583: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3475,7 +3606,7 @@ EOF
      # We look for the one that returns `int'.
      # Hopefully this check is robust enough.
      cat > conftest.$ac_ext <<EOF
-#line 3479 "configure"
+#line 3610 "configure"
 #include "confdefs.h"
 #include <netdb.h>
 EOF
@@ -3499,12 +3630,12 @@ done
    for ac_func in gethostname
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3503: checking for $ac_func" >&5
+echo "configure:3634: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3508 "configure"
+#line 3639 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3527,7 +3658,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3531: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3662: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3551,7 +3682,7 @@ EOF
 EOF
 
      cat > conftest.$ac_ext <<EOF
-#line 3555 "configure"
+#line 3686 "configure"
 #include "confdefs.h"
 #include <unistd.h>
 EOF
@@ -3582,12 +3713,12 @@ done
       for ac_func in pthread_mutexattr_settype pthread_mutexattr_setkind_np
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3586: checking for $ac_func" >&5
+echo "configure:3717: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3591 "configure"
+#line 3722 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3610,7 +3741,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3614: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3745: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3640,12 +3771,12 @@ done
       for ac_func in sched_yield
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3644: checking for $ac_func" >&5
+echo "configure:3775: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3649 "configure"
+#line 3780 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3668,7 +3799,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3672: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3803: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3690,7 +3821,7 @@ EOF
 else
   echo "$ac_t""no" 1>&6
 echo $ac_n "checking for sched_yield in -lrt""... $ac_c" 1>&6
-echo "configure:3694: checking for sched_yield in -lrt" >&5
+echo "configure:3825: checking for sched_yield in -lrt" >&5
 ac_lib_var=`echo rt'_'sched_yield | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3698,7 +3829,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lrt  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3702 "configure"
+#line 3833 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3709,7 +3840,7 @@ int main() {
 sched_yield()
 ; return 0; }
 EOF
-if { (eval echo configure:3713: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3844: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3735,7 +3866,7 @@ else
   echo "$ac_t""no" 1>&6
 
 	  echo $ac_n "checking for sched_yield in -lposix4""... $ac_c" 1>&6
-echo "configure:3739: checking for sched_yield in -lposix4" >&5
+echo "configure:3870: checking for sched_yield in -lposix4" >&5
 ac_lib_var=`echo posix4'_'sched_yield | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3743,7 +3874,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lposix4  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3747 "configure"
+#line 3878 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3754,7 +3885,7 @@ int main() {
 sched_yield()
 ; return 0; }
 EOF
-if { (eval echo configure:3758: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3889: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3790,7 +3921,7 @@ done
       # We can save a little space at runtime if the mutex has m_count
       # or __m_count.  This is a nice hack for Linux.
       cat > conftest.$ac_ext <<EOF
-#line 3794 "configure"
+#line 3925 "configure"
 #include "confdefs.h"
 #include <pthread.h>
 int main() {
@@ -3799,7 +3930,7 @@ int main() {
         
 ; return 0; }
 EOF
-if { (eval echo configure:3803: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3934: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define PTHREAD_MUTEX_HAVE_M_COUNT 1
@@ -3811,7 +3942,7 @@ else
   rm -rf conftest*
   
 	cat > conftest.$ac_ext <<EOF
-#line 3815 "configure"
+#line 3946 "configure"
 #include "confdefs.h"
 #include <pthread.h>
 int main() {
@@ -3820,7 +3951,7 @@ int main() {
 	  
 ; return 0; }
 EOF
-if { (eval echo configure:3824: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3955: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define PTHREAD_MUTEX_HAVE___M_COUNT 1
@@ -3840,12 +3971,12 @@ rm -f conftest*
    for ac_func in gettimeofday time ftime
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3844: checking for $ac_func" >&5
+echo "configure:3975: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3849 "configure"
+#line 3980 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3868,7 +3999,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3872: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4003: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3899,12 +4030,12 @@ done
    for ac_func in memmove
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3903: checking for $ac_func" >&5
+echo "configure:4034: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3908 "configure"
+#line 4039 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3927,7 +4058,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3931: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4062: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3957,12 +4088,12 @@ done
    for ac_func in memcpy
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3961: checking for $ac_func" >&5
+echo "configure:4092: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3966 "configure"
+#line 4097 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3985,7 +4116,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3989: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4120: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -4033,7 +4164,7 @@ done
    #--------------------------------------------------------------------
 
    echo $ac_n "checking for socket libraries""... $ac_c" 1>&6
-echo "configure:4037: checking for socket libraries" >&5
+echo "configure:4168: checking for socket libraries" >&5
 if eval "test \"`echo '$''{'gcj_cv_lib_sockets'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4041,12 +4172,12 @@ else
      gcj_checkBoth=0
      unset ac_cv_func_connect
      echo $ac_n "checking for connect""... $ac_c" 1>&6
-echo "configure:4045: checking for connect" >&5
+echo "configure:4176: checking for connect" >&5
 if eval "test \"`echo '$''{'ac_cv_func_connect'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4050 "configure"
+#line 4181 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char connect(); below.  */
@@ -4069,7 +4200,7 @@ connect();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4073: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4204: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_connect=yes"
 else
@@ -4092,7 +4223,7 @@ fi
      if test "$gcj_checkSocket" = 1; then
 	 unset ac_cv_func_connect
 	 echo $ac_n "checking for main in -lsocket""... $ac_c" 1>&6
-echo "configure:4096: checking for main in -lsocket" >&5
+echo "configure:4227: checking for main in -lsocket" >&5
 ac_lib_var=`echo socket'_'main | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4100,14 +4231,14 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lsocket  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4104 "configure"
+#line 4235 "configure"
 #include "confdefs.h"
 
 int main() {
 main()
 ; return 0; }
 EOF
-if { (eval echo configure:4111: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4242: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4134,12 +4265,12 @@ fi
 	 LIBS="$LIBS -lsocket -lnsl"
 	 unset ac_cv_func_accept
 	 echo $ac_n "checking for accept""... $ac_c" 1>&6
-echo "configure:4138: checking for accept" >&5
+echo "configure:4269: checking for accept" >&5
 if eval "test \"`echo '$''{'ac_cv_func_accept'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4143 "configure"
+#line 4274 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char accept(); below.  */
@@ -4162,7 +4293,7 @@ accept();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4166: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4297: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_accept=yes"
 else
@@ -4189,12 +4320,12 @@ fi
      gcj_oldLibs=$LIBS
      LIBS="$LIBS $gcj_cv_lib_sockets"
      echo $ac_n "checking for gethostbyname""... $ac_c" 1>&6
-echo "configure:4193: checking for gethostbyname" >&5
+echo "configure:4324: checking for gethostbyname" >&5
 if eval "test \"`echo '$''{'ac_cv_func_gethostbyname'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4198 "configure"
+#line 4329 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char gethostbyname(); below.  */
@@ -4217,7 +4348,7 @@ gethostbyname();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4221: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4352: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_gethostbyname=yes"
 else
@@ -4235,7 +4366,7 @@ if eval "test \"`echo '$ac_cv_func_'gethostbyname`\" = yes"; then
 else
   echo "$ac_t""no" 1>&6
 echo $ac_n "checking for main in -lnsl""... $ac_c" 1>&6
-echo "configure:4239: checking for main in -lnsl" >&5
+echo "configure:4370: checking for main in -lnsl" >&5
 ac_lib_var=`echo nsl'_'main | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4243,14 +4374,14 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lnsl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4247 "configure"
+#line 4378 "configure"
 #include "confdefs.h"
 
 int main() {
 main()
 ; return 0; }
 EOF
-if { (eval echo configure:4254: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4385: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4282,7 +4413,7 @@ echo "$ac_t""$gcj_cv_lib_sockets" 1>&6
 
    if test "$with_system_zlib" = yes; then
       echo $ac_n "checking for deflate in -lz""... $ac_c" 1>&6
-echo "configure:4286: checking for deflate in -lz" >&5
+echo "configure:4417: checking for deflate in -lz" >&5
 ac_lib_var=`echo z'_'deflate | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4290,7 +4421,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lz  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4294 "configure"
+#line 4425 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4301,7 +4432,7 @@ int main() {
 deflate()
 ; return 0; }
 EOF
-if { (eval echo configure:4305: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4436: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4330,7 +4461,7 @@ fi
    # requires -ldl.
    if test "$GC" = boehm; then
       echo $ac_n "checking for main in -ldl""... $ac_c" 1>&6
-echo "configure:4334: checking for main in -ldl" >&5
+echo "configure:4465: checking for main in -ldl" >&5
 ac_lib_var=`echo dl'_'main | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4338,14 +4469,14 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-ldl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4342 "configure"
+#line 4473 "configure"
 #include "confdefs.h"
 
 int main() {
 main()
 ; return 0; }
 EOF
-if { (eval echo configure:4349: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4480: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4465,7 +4596,7 @@ EOF
 # See if gcj supports -fuse-divide-subroutine.  gcc 2.95 does not, and
 # we want to continue to support that version.
 echo $ac_n "checking whether gcj supports -fuse-divide-subroutine""... $ac_c" 1>&6
-echo "configure:4469: checking whether gcj supports -fuse-divide-subroutine" >&5
+echo "configure:4600: checking whether gcj supports -fuse-divide-subroutine" >&5
 cat > conftest.java << 'END'
 public class conftest { }
 END
@@ -4485,17 +4616,17 @@ for ac_hdr in unistd.h bstring.h sys/time.h sys/types.h fcntl.h sys/ioctl.h sys/
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:4489: checking for $ac_hdr" >&5
+echo "configure:4620: checking for $ac_hdr" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4494 "configure"
+#line 4625 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4499: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4630: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4525,17 +4656,17 @@ for ac_hdr in dirent.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:4529: checking for $ac_hdr" >&5
+echo "configure:4660: checking for $ac_hdr" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4534 "configure"
+#line 4665 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4539: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4670: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4563,12 +4694,12 @@ done
 
 
 echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&6
-echo "configure:4567: checking for ANSI C header files" >&5
+echo "configure:4698: checking for ANSI C header files" >&5
 if eval "test \"`echo '$''{'ac_cv_header_stdc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4572 "configure"
+#line 4703 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 #include <stdarg.h>
@@ -4576,7 +4707,7 @@ else
 #include <float.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4580: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4711: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4593,7 +4724,7 @@ rm -f conftest*
 if test $ac_cv_header_stdc = yes; then
   # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 4597 "configure"
+#line 4728 "configure"
 #include "confdefs.h"
 #include <string.h>
 EOF
@@ -4611,7 +4742,7 @@ fi
 if test $ac_cv_header_stdc = yes; then
   # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 4615 "configure"
+#line 4746 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 EOF
@@ -4632,7 +4763,7 @@ if test "$cross_compiling" = yes; then
   :
 else
   cat > conftest.$ac_ext <<EOF
-#line 4636 "configure"
+#line 4767 "configure"
 #include "confdefs.h"
 #include <ctype.h>
 #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
@@ -4643,7 +4774,7 @@ if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
 exit (0); }
 
 EOF
-if { (eval echo configure:4647: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:4778: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   :
 else
@@ -4667,12 +4798,12 @@ EOF
 fi
 
 echo $ac_n "checking for ssize_t""... $ac_c" 1>&6
-echo "configure:4671: checking for ssize_t" >&5
+echo "configure:4802: checking for ssize_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_ssize_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4676 "configure"
+#line 4807 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -4701,9 +4832,9 @@ fi
 
 
 echo $ac_n "checking for in_addr_t""... $ac_c" 1>&6
-echo "configure:4705: checking for in_addr_t" >&5
+echo "configure:4836: checking for in_addr_t" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4707 "configure"
+#line 4838 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -4717,7 +4848,7 @@ int main() {
 in_addr_t foo;
 ; return 0; }
 EOF
-if { (eval echo configure:4721: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4852: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_IN_ADDR_T 1
@@ -4733,16 +4864,16 @@ fi
 rm -f conftest*
 
 echo $ac_n "checking whether struct ip_mreq is in netinet/in.h""... $ac_c" 1>&6
-echo "configure:4737: checking whether struct ip_mreq is in netinet/in.h" >&5
+echo "configure:4868: checking whether struct ip_mreq is in netinet/in.h" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4739 "configure"
+#line 4870 "configure"
 #include "confdefs.h"
 #include <netinet/in.h>
 int main() {
 struct ip_mreq mreq;
 ; return 0; }
 EOF
-if { (eval echo configure:4746: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4877: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_STRUCT_IP_MREQ 1
@@ -4758,16 +4889,16 @@ fi
 rm -f conftest*
 
 echo $ac_n "checking whether struct sockaddr_in6 is in netinet/in.h""... $ac_c" 1>&6
-echo "configure:4762: checking whether struct sockaddr_in6 is in netinet/in.h" >&5
+echo "configure:4893: checking whether struct sockaddr_in6 is in netinet/in.h" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4764 "configure"
+#line 4895 "configure"
 #include "confdefs.h"
 #include <netinet/in.h>
 int main() {
 struct sockaddr_in6 addr6;
 ; return 0; }
 EOF
-if { (eval echo configure:4771: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4902: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_INET6 1
@@ -4783,16 +4914,16 @@ fi
 rm -f conftest*
 
 echo $ac_n "checking for socklen_t in sys/socket.h""... $ac_c" 1>&6
-echo "configure:4787: checking for socklen_t in sys/socket.h" >&5
+echo "configure:4918: checking for socklen_t in sys/socket.h" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4789 "configure"
+#line 4920 "configure"
 #include "confdefs.h"
 #include <sys/socket.h>
 int main() {
 socklen_t x = 5;
 ; return 0; }
 EOF
-if { (eval echo configure:4796: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4927: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_SOCKLEN_T 1
@@ -4808,16 +4939,16 @@ fi
 rm -f conftest*
 
 echo $ac_n "checking for tm_gmtoff in struct tm""... $ac_c" 1>&6
-echo "configure:4812: checking for tm_gmtoff in struct tm" >&5
+echo "configure:4943: checking for tm_gmtoff in struct tm" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4814 "configure"
+#line 4945 "configure"
 #include "confdefs.h"
 #include <time.h>
 int main() {
 struct tm tim; tim.tm_gmtoff = 0;
 ; return 0; }
 EOF
-if { (eval echo configure:4821: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4952: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define STRUCT_TM_HAS_GMTOFF 1
@@ -4830,16 +4961,16 @@ else
   rm -rf conftest*
   echo "$ac_t""no" 1>&6
    echo $ac_n "checking for global timezone variable""... $ac_c" 1>&6
-echo "configure:4834: checking for global timezone variable" >&5
+echo "configure:4965: checking for global timezone variable" >&5
             cat > conftest.$ac_ext <<EOF
-#line 4836 "configure"
+#line 4967 "configure"
 #include "confdefs.h"
 #include <time.h>
 int main() {
 long z2 = timezone;
 ; return 0; }
 EOF
-if { (eval echo configure:4843: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4974: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_TIMEZONE 1
@@ -4859,19 +4990,19 @@ rm -f conftest*
 # The Ultrix 4.2 mips builtin alloca declared by alloca.h only works
 # for constant arguments.  Useless!
 echo $ac_n "checking for working alloca.h""... $ac_c" 1>&6
-echo "configure:4863: checking for working alloca.h" >&5
+echo "configure:4994: checking for working alloca.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_alloca_h'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4868 "configure"
+#line 4999 "configure"
 #include "confdefs.h"
 #include <alloca.h>
 int main() {
 char *p = alloca(2 * sizeof(int));
 ; return 0; }
 EOF
-if { (eval echo configure:4875: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5006: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   ac_cv_header_alloca_h=yes
 else
@@ -4892,12 +5023,12 @@ EOF
 fi
 
 echo $ac_n "checking for alloca""... $ac_c" 1>&6
-echo "configure:4896: checking for alloca" >&5
+echo "configure:5027: checking for alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_func_alloca_works'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4901 "configure"
+#line 5032 "configure"
 #include "confdefs.h"
 
 #ifdef __GNUC__
@@ -4925,7 +5056,7 @@ int main() {
 char *p = (char *) alloca(1);
 ; return 0; }
 EOF
-if { (eval echo configure:4929: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5060: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   ac_cv_func_alloca_works=yes
 else
@@ -4957,12 +5088,12 @@ EOF
 
 
 echo $ac_n "checking whether alloca needs Cray hooks""... $ac_c" 1>&6
-echo "configure:4961: checking whether alloca needs Cray hooks" >&5
+echo "configure:5092: checking whether alloca needs Cray hooks" >&5
 if eval "test \"`echo '$''{'ac_cv_os_cray'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4966 "configure"
+#line 5097 "configure"
 #include "confdefs.h"
 #if defined(CRAY) && ! defined(CRAY2)
 webecray
@@ -4987,12 +5118,12 @@ echo "$ac_t""$ac_cv_os_cray" 1>&6
 if test $ac_cv_os_cray = yes; then
 for ac_func in _getb67 GETB67 getb67; do
   echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:4991: checking for $ac_func" >&5
+echo "configure:5122: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4996 "configure"
+#line 5127 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5015,7 +5146,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5019: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5150: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5042,7 +5173,7 @@ done
 fi
 
 echo $ac_n "checking stack direction for C alloca""... $ac_c" 1>&6
-echo "configure:5046: checking stack direction for C alloca" >&5
+echo "configure:5177: checking stack direction for C alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_c_stack_direction'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -5050,7 +5181,7 @@ else
   ac_cv_c_stack_direction=0
 else
   cat > conftest.$ac_ext <<EOF
-#line 5054 "configure"
+#line 5185 "configure"
 #include "confdefs.h"
 find_stack_direction ()
 {
@@ -5069,7 +5200,7 @@ main ()
   exit (find_stack_direction() < 0);
 }
 EOF
-if { (eval echo configure:5073: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:5204: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_c_stack_direction=1
 else
@@ -5096,7 +5227,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:5100: checking for $ac_word" >&5
+echo "configure:5231: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_PERL'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
diff --git a/libjava/configure.in b/libjava/configure.in
index 080146a..612b30f 100644
--- a/libjava/configure.in
+++ b/libjava/configure.in
@@ -86,7 +86,7 @@ fi
 FORCELIBGCCSPEC=
 dnl Work around libgcc design flaw.
 if test "$ac_cv_prog_gnu_ld" = yes; then
-   FORCELIBGCCSPEC="-u __rethrow -lgcc"
+   FORCELIBGCCSPEC="-u __rethrow -u __frame_state_for -lgcc"
 fi   
 
 AC_MSG_CHECKING([for data_start])
@@ -360,6 +360,10 @@ else
    AC_CHECK_FUNCS(access stat mkdir rename rmdir unlink realpath)
    AC_CHECK_FUNCS(inet_aton inet_addr, break)
    AC_CHECK_FUNCS(inet_pton uname inet_ntoa)
+   AC_CHECK_FUNCS(backtrace fork execvp pipe)
+   AC_CHECK_HEADERS(execinfo.h unistd.h dlfcn.h) 
+   AC_CHECK_FILES(/proc/self/exe, [
+     AC_DEFINE(HAVE_PROC_SELF_EXE)])
 
    AC_CHECK_FUNCS(gethostbyname_r, [
      AC_DEFINE(HAVE_GETHOSTBYNAME_R)
diff --git a/libjava/include/config.h.in b/libjava/include/config.h.in
index 8dbdc5d..c636c93 100644
--- a/libjava/include/config.h.in
+++ b/libjava/include/config.h.in
@@ -135,12 +135,25 @@
 /* Define if using setjmp/longjmp exceptions.  */
 #undef SJLJ_EXCEPTIONS
 
+/* Define if you have /proc/self/exe */
+#undef HAVE_PROC_SELF_EXE
+
+ 
 /* Define if getuid() and friends are missing.  */
 #undef NO_GETUID
 
 /* Define if you have the access function.  */
 #undef HAVE_ACCESS
 
+/* Define if you have the backtrace function.  */
+#undef HAVE_BACKTRACE
+
+/* Define if you have the execvp function.  */
+#undef HAVE_EXECVP
+
+/* Define if you have the fork function.  */
+#undef HAVE_FORK
+
 /* Define if you have the fstat function.  */
 #undef HAVE_FSTAT
 
@@ -201,6 +214,9 @@
 /* Define if you have the open function.  */
 #undef HAVE_OPEN
 
+/* Define if you have the pipe function.  */
+#undef HAVE_PIPE
+
 /* Define if you have the pthread_mutexattr_setkind_np function.  */
 #undef HAVE_PTHREAD_MUTEXATTR_SETKIND_NP
 
@@ -252,6 +268,12 @@
 /* Define if you have the <dirent.h> header file.  */
 #undef HAVE_DIRENT_H
 
+/* Define if you have the <dlfcn.h> header file.  */
+#undef HAVE_DLFCN_H
+
+/* Define if you have the <execinfo.h> header file.  */
+#undef HAVE_EXECINFO_H
+
 /* Define if you have the <fcntl.h> header file.  */
 #undef HAVE_FCNTL_H
 
diff --git a/libjava/include/jvm.h b/libjava/include/jvm.h
index 3b59b8d..49fc47b 100644
--- a/libjava/include/jvm.h
+++ b/libjava/include/jvm.h
@@ -182,4 +182,8 @@ extern "C"
   jlong _Jv_remJ (jlong, jlong);
 }
 
+/* get/set the name of the running executable. */
+extern char *_Jv_ThisExecutable (void);
+extern void _Jv_ThisExecutable (const char *);
+
 #endif /* __JAVA_JVM_H__ */
diff --git a/libjava/include/name-finder.h b/libjava/include/name-finder.h
new file mode 100644
index 0000000..9a1d7df
--- /dev/null
+++ b/libjava/include/name-finder.h
@@ -0,0 +1,69 @@
+// name-finder.h - Convert addresses to names
+
+/* Copyright (C) 2000  Red Hat Inc
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+/**
+ * @author Andrew Haley <aph@cygnus.com>
+ * @date Jan 6  2000
+ */
+
+#include <gcj/cni.h>
+#include <jvm.h>
+
+#include <sys/types.h>
+
+#include <string.h>
+#include <stdio.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+/* _Jv_name_finder is a class wrapper around a mechanism that can
+   convert addresses of methods to their names and the names of files
+   in which they appear. */
+
+class _Jv_name_finder
+{
+public:  
+  _Jv_name_finder (char *executable);
+  ~_Jv_name_finder ()
+    {
+#if defined (HAVE_PIPE) && defined (HAVE_FORK)
+      close (f_pipe[1]);
+      fclose (b_pipe_fd);
+#endif
+    }  
+
+/* Given a pointer to a function or method, try to convert it into a
+   name and the appropriate line and source file.  The caller passes
+   the code pointer in p.
+
+   Returns false if the lookup fails.  Even if this happens, the field
+   hex will have been correctly filled in with the pointer. 
+
+   The other fields are method_name and file_name, which lookup will
+   attempt to fill appropriately.  If the lookup has failed, these
+   fields contain garbage.*/
+  bool lookup (void *p);
+
+  char method_name[1024];
+  char file_name[1024];
+  char hex[sizeof (void *) * 2 + 5];
+
+private:
+  void toHex (void *p);
+#if defined (HAVE_PIPE) && defined (HAVE_FORK)
+  int pid;
+  int f_pipe[2], b_pipe[2];
+  FILE *b_pipe_fd;
+  int error;
+#endif
+};
+
diff --git a/libjava/java/lang/Throwable.java b/libjava/java/lang/Throwable.java
index 5ae39ae..faba2be 100644
--- a/libjava/java/lang/Throwable.java
+++ b/libjava/java/lang/Throwable.java
@@ -12,6 +12,7 @@ package java.lang;
 import java.io.PrintStream;
 import java.io.PrintWriter;
 import java.io.Serializable;
+import java.io.OutputStreamWriter;
 
 /**
  * @author Tom Tromey <tromey@cygnus.com>
@@ -26,55 +27,51 @@ import java.io.Serializable;
 
 public class Throwable implements Serializable
 {
-  public Throwable fillInStackTrace ()
-    {
-      return this;
-    }
+  public native Throwable fillInStackTrace ();
 
   public String getLocalizedMessage ()
-    {
-      return getMessage ();
-    }
+  {
+    return getMessage ();
+  }
 
   public String getMessage ()
-    {
-      return detailMessage;
-    }
+  {
+    return detailMessage;
+  }
 
   public void printStackTrace ()
-    {
-      printStackTrace (System.err);
-    }
-
-  public void printStackTrace (PrintStream s)
-    {
-      // No stack trace, but we can still print this object.
-      s.println(toString ());
-    }
-
-  public void printStackTrace (PrintWriter wr)
-    {
-      // No stack trace, but we can still print this object.
-      wr.println(toString ());
-    }
-
+  {
+    printStackTrace (System.err);
+  }
+
+  public void printStackTrace (PrintStream ps)
+  {
+    printStackTrace (new PrintWriter(new OutputStreamWriter(ps)));
+  }
+  
+  public native void printStackTrace (PrintWriter wr);
+  
   public Throwable ()
-    {
-      detailMessage = null;
-    }
+  {
+    detailMessage = null;
+    fillInStackTrace ();
+  }
 
   public Throwable (String message)
-    {
-      detailMessage = message;
-    }
+  {
+    detailMessage = message;
+    fillInStackTrace ();
+  }
 
   public String toString ()
-    {
-      return ((detailMessage == null)
-	      ? getClass().getName()
-	      : getClass().getName() + ": " + getMessage ());
-    }
+  {
+    return ((detailMessage == null)
+	    ? getClass().getName()
+	    : getClass().getName() + ": " + getMessage ());
+  }
 
   // Name of this field comes from serialization spec.
   private String detailMessage;
+
+  private byte stackTrace[];
 }
diff --git a/libjava/java/lang/natThrowable.cc b/libjava/java/lang/natThrowable.cc
new file mode 100644
index 0000000..2227e7d
--- /dev/null
+++ b/libjava/java/lang/natThrowable.cc
@@ -0,0 +1,95 @@
+// natThrowable.cc - Superclass for all exceptions.
+
+/* Copyright (C) 2000  Red Hat Inc
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+/**
+ * @author Andrew Haley <aph@cygnus.com>
+ * @date Jan 6  2000
+ */
+
+#include <config.h>
+
+#include <string.h>
+
+#pragma implementation "Throwable.h"
+
+#include <gcj/cni.h>
+#include <jvm.h>
+#include <java/lang/Object.h>
+#include <java-threads.h>
+#include <java/lang/Throwable.h>
+#include <java/io/PrintStream.h>
+#include <java/io/PrintWriter.h>
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <unistd.h>
+
+#ifdef HAVE_EXECINFO_H
+#include <execinfo.h>
+#endif
+
+#include <name-finder.h>
+
+/* FIXME: size of the stack trace is limited to 128 elements.  It's
+   undoubtedly sensible to limit the stack trace, but 128 is rather
+   arbitrary.  It may be better to configure this.  */
+
+java::lang::Throwable *
+java::lang::Throwable::fillInStackTrace (void)
+{
+#ifdef HAVE_BACKTRACE
+  void *p[128];
+  
+  // We subtract 1 from the number of elements because we don't want
+  // to include the call to fillInStackTrace in the trace.
+  int n = backtrace (p, 128) - 1;  
+
+  // ???  Might this cause a problem if the byte array isn't aligned?
+  stackTrace = JvNewByteArray (n * sizeof p[0]);
+  memcpy (elements (stackTrace), p+1, (n * sizeof p[0]));
+
+  return this;
+#endif
+}
+
+void 
+java::lang::Throwable::printStackTrace (java::io::PrintWriter *wr)
+{
+  wr->println (toString ());
+#ifdef HAVE_BACKTRACE
+  if (!stackTrace)
+    return;
+
+  void **p = (void **)elements (stackTrace);
+  int depth = stackTrace->length / sizeof p[0];
+
+  _Jv_name_finder finder (_Jv_ThisExecutable ());
+
+  for (int i = 0; i < depth; i++)
+    {
+      bool found = finder.lookup (p[i]);
+      wr->print (JvNewStringLatin1 ("   at "));
+      wr->print (JvNewStringLatin1 (finder.hex));
+      if (found)
+	{
+	  wr->print (JvNewStringLatin1 (": "));
+	  wr->print (JvNewStringLatin1 (finder.method_name));
+	  wr->print (JvNewStringLatin1 (" ("));
+	  wr->print (JvNewStringLatin1 (finder.file_name));
+	  wr->print (JvNewStringLatin1 (")"));
+	}
+      wr->println ();
+    }
+#endif /* HAVE_BACKTRACE */
+}
+
diff --git a/libjava/name-finder.cc b/libjava/name-finder.cc
new file mode 100644
index 0000000..ba8a5ae
--- /dev/null
+++ b/libjava/name-finder.cc
@@ -0,0 +1,180 @@
+// name-finder.cc - Convert addresses to names
+
+/* Copyright (C) 2000  Red Hat Inc
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+/**
+ * @author Andrew Haley <aph@cygnus.com>
+ * @date Jan 6  2000
+ */
+
+/* _Jv_name_finder is a class wrapper around a mechanism that can
+   convert address of methods to their names and the names of files in
+   which they appear.
+
+   Right now, the only implementation of this involves running a copy
+   of addr2line, but at some point it is worth building this
+   functionality into libgcj, if only for embedded systems.  */
+
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#include <config.h>
+
+#include <string.h>
+
+#include <gcj/cni.h>
+#include <jvm.h>
+#include <java/lang/Object.h>
+#include <java-threads.h>
+#include <java/lang/Throwable.h>
+#include <java/io/PrintStream.h>
+#include <java/io/PrintWriter.h>
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
+
+#include <name-finder.h>
+
+/* Create a new name finder which will perform address lookups on an
+   executable. */
+
+_Jv_name_finder::_Jv_name_finder (char *executable)
+{
+#if defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP)
+  error = 0;
+
+  char *argv[6];
+  {
+    int arg = 0;
+    argv[arg++] = "addr2line";
+    argv[arg++] = "-C";
+    argv[arg++] = "-f";
+    argv[arg++] = "-e";
+    argv[arg++] = executable;
+    argv[arg] = NULL;
+  }
+
+  error |= pipe (f_pipe) < 0;
+  error |= pipe (b_pipe) < 0;
+      
+  if (error)
+    return;
+
+  pid = fork ();
+  if (pid == 0)
+    {
+      close (f_pipe[1]);
+      close (b_pipe[0]);
+      dup2 (f_pipe[0], fileno (stdin));
+      dup2 (b_pipe[1], fileno (stdout));
+      execvp (argv[0], argv);
+      _exit (127);
+    }
+      
+  close (f_pipe [0]);
+  close (b_pipe [1]);
+      
+  if (pid < 0)
+    {
+      error |= 1; 
+      return;
+    }
+      
+  b_pipe_fd = fdopen (b_pipe[0], "r");
+  error |= !b_pipe_fd;
+#endif
+}
+
+/* Convert a pointer to hex. */
+
+void
+_Jv_name_finder::toHex (void *p)
+{
+  unsigned long long n = (unsigned long long)p;
+  int digits = sizeof (void *) * 2;
+
+  strcpy (hex, "0x");
+  for (int i = digits - 1; i >= 0; i--)
+    {
+      int digit = n % 16;
+      
+      n /= 16;
+      hex[i+2] = digit > 9 ? 'a' + digit - 10 : '0' + digit; 
+    }
+  hex [digits+2] = 0;
+}   
+
+/* Given a pointer to a function or method, try to convert it into a
+   name and the appropriate line and source file.  The caller passes
+   the code pointer in p.
+
+   Returns false if the lookup fails.  Even if this happens, the field
+   he will have been correctly filled in with the pointer.  */
+
+bool
+_Jv_name_finder::lookup (void *p)
+{
+  toHex (p);
+      
+#ifdef HAVE_DLFCN_H
+  {
+    Dl_info dl_info;
+    
+    if (dladdr (p, &dl_info))
+      {
+	strncpy (file_name, dl_info.dli_fname, sizeof file_name);
+	strncpy (method_name, dl_info.dli_sname, sizeof method_name);
+	return true;
+      }
+  }
+#endif
+
+#if defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP)
+  if (error)
+    return false;
+
+  error |= write (f_pipe[1], hex, strlen (hex)) < 0;
+  if (error)
+    return false;
+  error |= write (f_pipe[1], "\n", 1) < 0;
+  if (error)
+    return false;
+
+  error |= (fgets (method_name, sizeof method_name, b_pipe_fd) == NULL);
+  if (error)
+    return false;
+  error |= (fgets (file_name, sizeof file_name, b_pipe_fd) == NULL);
+  if (error)
+    return false;
+
+  char *newline = strchr (method_name, '\n');
+  if (newline)
+    *newline = 0;
+  newline = strchr (file_name, '\n');
+  if (newline)
+    *newline = 0;
+
+  return true;
+
+#else
+  return false;
+#endif /* defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP) */
+}
diff --git a/libjava/prims.cc b/libjava/prims.cc
index 2a413ae..f427a5a 100644
--- a/libjava/prims.cc
+++ b/libjava/prims.cc
@@ -16,6 +16,10 @@ details.  */
 #include <string.h>
 #include <signal.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #include <gcj/cni.h>
 #include <jvm.h>
 #include <java-signal.h>
@@ -68,6 +72,10 @@ const char **_Jv_Compiler_Properties;
 // Property key/value pairs.
 property_pair *_Jv_Environment_Properties;
 #endif
+
+// The name of this executable.
+static char * _Jv_execName;
+
 
 
 #ifdef HANDLE_SEGV
@@ -75,6 +83,7 @@ static java::lang::NullPointerException *nullp;
 SIGNAL_HANDLER (catch_segv)
 {
   MAKE_THROW_FRAME;
+  nullp->fillInStackTrace ();
   _Jv_Throw (nullp);
 }
 #endif
@@ -89,6 +98,7 @@ SIGNAL_HANDLER (catch_fpe)
 #else
   MAKE_THROW_FRAME;
 #endif
+  arithexception->fillInStackTrace ();
   _Jv_Throw (arithexception);
 }
 #endif
@@ -638,8 +648,24 @@ static java::lang::ThreadGroup *main_group;
 // The primary thread.
 static java::lang::Thread *main_thread;
 
+char *
+_Jv_ThisExecutable (void)
+{
+  return _Jv_execName;
+}
+
+void
+_Jv_ThisExecutable (const char *name)
+{
+  if (name)
+    {
+      _Jv_execName = new char[strlen (name) + 1];
+      strcpy (_Jv_execName, name);
+    }
+}
+
 static void
-main_init (void)
+main_init ()
 {
   INIT_SEGV;
 #ifdef HANDLE_FPE
@@ -812,6 +838,13 @@ JvRunMain (jclass klass, int argc, const char **argv)
   PROCESS_GCJ_PROPERTIES;
 
   main_init ();
+#ifdef HAVE_PROC_SELF_EXE
+  char exec_name[20];
+  sprintf (exec_name, "/proc/%d/exe", getpid ());
+  _Jv_ThisExecutable (exec_name);
+#else
+  _Jv_ThisExecutable (argv[0]);
+#endif
 
   arg_vec = JvConvertArgv (argc - 1, argv + 1);
   main_group = new java::lang::ThreadGroup (23);