Add Go frontend, libgo library, and Go testsuite.

gcc/:
	* gcc.c (default_compilers): Add entry for ".go".
	* common.opt: Add -static-libgo as a driver option.
	* doc/install.texi (Configuration): Mention libgo as an option for
	--enable-shared.  Mention go as an option for --enable-languages.
	* doc/invoke.texi (Overall Options): Mention .go as a file name
	suffix.  Mention go as a -x option.
	* doc/frontends.texi (G++ and GCC): Mention Go as a supported
	language.
	* doc/sourcebuild.texi (Top Level): Mention libgo.
	* doc/standards.texi (Standards): Add section on Go language.
	Move references for other languages into their own section.
	* doc/contrib.texi (Contributors): Mention that I contributed the
	Go frontend.
gcc/testsuite/:
	* lib/go.exp: New file.
	* lib/go-dg.exp: New file.
	* lib/go-torture.exp: New file.
	* lib/target-supports.exp (check_compile): Match // Go.

From-SVN: r167407

1 files changed, 194 insertions, 0 deletions

diff --git a/libgo/runtime/go-signal.c b/libgo/runtime/go-signal.c
new file mode 100644
index 0000000..8f44970
--- /dev/null
+++ b/libgo/runtime/go-signal.c
@@ -0,0 +1,194 @@
+/* go-signal.c -- signal handling for Go.
+
+   Copyright 2009 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#include <signal.h>
+#include <stdlib.h>
+
+#include "go-assert.h"
+#include "go-panic.h"
+#include "go-signal.h"
+
+#include "runtime.h"
+
+#undef int 
+
+#ifndef SA_ONSTACK
+#define SA_ONSTACK 0
+#endif
+
+/* What to do for a signal.  */
+
+struct sigtab
+{
+  /* Signal number.  */
+  int sig;
+  /* Nonzero if the signal should be ignored.  */
+  _Bool ignore;
+};
+
+/* What to do for signals.  */
+
+static struct sigtab signals[] =
+{
+  { SIGHUP, 0 },
+  { SIGINT, 0 },
+  { SIGALRM, 1 },
+  { SIGTERM, 0 },
+#ifdef SIGBUS
+  { SIGBUS, 0 },
+#endif
+#ifdef SIGFPE
+  { SIGFPE, 0 },
+#endif
+#ifdef SIGUSR1
+  { SIGUSR1, 1 },
+#endif
+#ifdef SIGSEGV
+  { SIGSEGV, 0 },
+#endif
+#ifdef SIGUSR2
+  { SIGUSR2, 1 },
+#endif
+#ifdef SIGPIPE
+  { SIGPIPE, 1 },
+#endif
+#ifdef SIGCHLD
+  { SIGCHLD, 1 },
+#endif
+#ifdef SIGTSTP
+  { SIGTSTP, 1 },
+#endif
+#ifdef SIGTTIN
+  { SIGTTIN, 1 },
+#endif
+#ifdef SIGTTOU
+  { SIGTTOU, 1 },
+#endif
+#ifdef SIGURG
+  { SIGURG, 1 },
+#endif
+#ifdef SIGXCPU
+  { SIGXCPU, 1 },
+#endif
+#ifdef SIGXFSZ
+  { SIGXFSZ, 1 },
+#endif
+#ifdef SIGVTARLM
+  { SIGVTALRM, 1 },
+#endif
+#ifdef SIGPROF
+  { SIGPROF, 1 },
+#endif
+#ifdef SIGWINCH
+  { SIGWINCH, 1 },
+#endif
+#ifdef SIGIO
+  { SIGIO, 1 },
+#endif
+#ifdef SIGPWR
+  { SIGPWR, 1 },
+#endif
+  { -1, 0 }
+};
+
+/* The Go signal handler.  */
+
+static void
+sighandler (int sig)
+{
+  const char *msg;
+  int i;
+
+  /* FIXME: Should check siginfo for more information when
+     available.  */
+  msg = NULL;
+  switch (sig)
+    {
+#ifdef SIGBUS
+    case SIGBUS:
+      msg = "invalid memory address or nil pointer dereference";
+      break;
+#endif
+
+#ifdef SIGFPE
+    case SIGFPE:
+      msg = "integer divide by zero or floating point error";
+      break;
+#endif
+
+#ifdef SIGSEGV
+    case SIGSEGV:
+      msg = "invalid memory address or nil pointer dereference";
+      break;
+#endif
+
+    default:
+      break;
+    }
+
+  if (msg != NULL)
+    {
+      sigset_t clear;
+
+      /* The signal handler blocked signals; unblock them.  */
+      i = sigfillset (&clear);
+      __go_assert (i == 0);
+      i = sigprocmask (SIG_UNBLOCK, &clear, NULL);
+      __go_assert (i == 0);
+
+      __go_panic_msg (msg);
+    }
+
+  if (__go_sigsend (sig))
+    return;
+  for (i = 0; signals[i].sig != -1; ++i)
+    {
+      if (signals[i].sig == sig)
+	{
+	  struct sigaction sa;
+
+	  if (signals[i].ignore)
+	    return;
+
+	  memset (&sa, 0, sizeof sa);
+
+	  sa.sa_handler = SIG_DFL;
+
+	  i = sigemptyset (&sa.sa_mask);
+	  __go_assert (i == 0);
+
+	  if (sigaction (sig, &sa, NULL) != 0)
+	    abort ();
+
+	  raise (sig);
+	  exit (2);
+	}
+    }
+  abort ();
+}
+
+/* Initialize signal handling for Go.  This is called when the program
+   starts.  */
+
+void
+__initsig ()
+{
+  struct sigaction sa;
+  int i;
+
+  siginit ();
+
+  memset (&sa, 0, sizeof sa);
+
+  sa.sa_handler = sighandler;
+
+  i = sigfillset (&sa.sa_mask);
+  __go_assert (i == 0);
+
+  for (i = 0; signals[i].sig != -1; ++i)
+    if (sigaction (signals[i].sig, &sa, NULL) != 0)
+      __go_assert (0);
+}