dwarf2-signal.h: New file.

2001-05-18  Andrew Haley  <aph@cambridge.redhat.com>

        * include/dwarf2-signal.h: New file.
        * configure.in (SYSDEP_SOURCES): Add dwarf2-signal.h for PPC.
        * configure.host (EXCEPTIONSPEC): Don't use sjlj on PPC.
        * configure: Rebuilt.

From-SVN: r42400

1 files changed, 72 insertions, 0 deletions

diff --git a/libjava/include/dwarf2-signal.h b/libjava/include/dwarf2-signal.h
new file mode 100644
index 0000000..ec32a7b
--- /dev/null
+++ b/libjava/include/dwarf2-signal.h
@@ -0,0 +1,72 @@
+// dwarf2-signal.h - Catch runtime signals and turn them into exceptions.
+
+/* Copyright (C) 2000, 2001  Free Software Foundation
+
+   This file is part of libgcj.
+
+   Use this file for every target for which the dwarf2 unwinder in
+   libgcc can unwind through signal handlers and no special actions
+   are needed.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+#ifndef JAVA_SIGNAL_H
+#define JAVA_SIGNAL_H 1
+
+#include <signal.h>
+#include <sys/syscall.h>
+
+#define HANDLE_SEGV 1
+#undef HANDLE_FPE
+
+#define SIGNAL_HANDLER(_name)	\
+static void _Jv_##_name (int)
+
+class java::lang::Throwable;
+
+// Unwind the stack to the point at which the signal was generated and
+// then throw an exception.  With the dwarf2 unwinder we don't need to
+// do anything.
+
+#define MAKE_THROW_FRAME(_exception)		\
+do						\
+{						\
+}						\
+while (0)
+
+
+#define INIT_SEGV						\
+do								\
+  {								\
+    nullp = new java::lang::NullPointerException ();    	\
+    struct sigaction act;					\
+    act.sa_handler = _Jv_catch_segv;				\
+    sigemptyset (&act.sa_mask);					\
+    act.sa_flags = 0;						\
+    syscall (SYS_sigaction, SIGSEGV, &act, NULL);		\
+  }								\
+while (0)  
+
+#define INIT_FPE						\
+do								\
+  { 								\
+    arithexception = new java::lang::ArithmeticException 	\
+      (JvNewStringLatin1 ("/ by zero"));			\
+    struct sigaction act;					\
+    act.sa_handler = _Jv_catch_fpe;				\
+    sigemptyset (&act.sa_mask);					\
+    act.sa_flags = 0;						\
+    syscall (SYS_sigaction, SIGFPE, &act, NULL);		\
+  }								\
+while (0)  
+
+/* We use syscall(SYS_sigaction) in INIT_SEGV and INIT_FPE instead of
+ * sigaction() because on some systems the pthreads wrappers for
+ * signal handlers are not compiled with unwind information, so it's
+ * not possible to unwind through them.  This is a problem that will
+ * go away once all systems have pthreads libraries that are
+ * compiled with full unwind info.  */
+
+#endif /* JAVA_SIGNAL_H */