gdbsupport: rename source files to .cc

This patch renames the .c source files in gdbsupport to .cc.

In the gdb directory, there is an argument against renaming the source
files, which is that it makes using some git commands more difficult to
do archeology.  Some commands have some kind of "follow" option that
makes git try to follow renames, but it doesn't work in all situations.

Given that we have just moved the gdbsupport directory, that argument
doesn't hold for source files in that directory.  I therefore suggest
renaming them to .cc, so that they are automatically recognized as C++
by various tools and editors.

The original motivation behind this is that when building gdbsupport
with clang, I get:

      CC       agent.o
    clang: error: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Werror,-Wdeprecated]

In the gdb/ directory, we make clang happy by passing "-x c++".  We
could do this in gdbsupport too, but I think that renaming the files is
a better long-term solution.

gdbserver still does its own build of gdbsupport, so a few changes in
its Makefile are necessary.

gdbsupport/ChangeLog:

	* Makefile.am: Rename source files from .c to .cc.
	(CC, CFLAGS): Don't override.
	(AM_CFLAGS): Rename to ...
	(AM_CXXFLAGS): ... this.
	* Makefile.in: Re-generate.
	* %.c: Rename to %.cc.

gdbserver/ChangeLog:

	* Makefile.in: Rename gdbsupport source files from .c to .cc.

1 files changed, 653 insertions, 0 deletions

diff --git a/gdbsupport/signals.cc b/gdbsupport/signals.cc
new file mode 100644
index 00000000000..485e0f01903
--- /dev/null
+++ b/gdbsupport/signals.cc
@@ -0,0 +1,653 @@
+/* Target signal translation functions for GDB.
+   Copyright (C) 1990-2020 Free Software Foundation, Inc.
+   Contributed by Cygnus Support.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "common-defs.h"
+
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+
+#include "gdb_signals.h"
+
+struct gdbarch;
+
+/* Always use __SIGRTMIN if it's available.  SIGRTMIN is the lowest
+   _available_ realtime signal, not the lowest supported; glibc takes
+   several for its own use.  */
+
+#ifndef REALTIME_LO
+# if defined(__SIGRTMIN)
+#  define REALTIME_LO __SIGRTMIN
+#  define REALTIME_HI (__SIGRTMAX + 1)
+# elif defined(SIGRTMIN)
+#  define REALTIME_LO SIGRTMIN
+#  define REALTIME_HI (SIGRTMAX + 1)
+# endif
+#endif
+
+/* This table must match in order and size the signals in enum
+   gdb_signal.  */
+
+static const struct {
+  const char *symbol;
+  const char *name;
+  const char *string;
+  } signals [] =
+{
+#define SET(symbol, constant, name, string) { #symbol, name, string },
+#include "gdb/signals.def"
+#undef SET
+};
+
+const char *
+gdb_signal_to_symbol_string (enum gdb_signal sig)
+{
+  gdb_assert ((int) sig >= GDB_SIGNAL_FIRST && (int) sig <= GDB_SIGNAL_LAST);
+
+  return signals[sig].symbol;
+}
+
+/* Return the string for a signal.  */
+const char *
+gdb_signal_to_string (enum gdb_signal sig)
+{
+  if ((int) sig >= GDB_SIGNAL_FIRST && (int) sig <= GDB_SIGNAL_LAST)
+    return signals[sig].string;
+  else
+    return signals[GDB_SIGNAL_UNKNOWN].string;
+}
+
+/* Return the name for a signal.  */
+const char *
+gdb_signal_to_name (enum gdb_signal sig)
+{
+  if ((int) sig >= GDB_SIGNAL_FIRST && (int) sig <= GDB_SIGNAL_LAST
+      && signals[sig].name != NULL)
+    return signals[sig].name;
+  else
+    /* I think the code which prints this will always print it along
+       with the string, so no need to be verbose (very old comment).  */
+    return "?";
+}
+
+/* Given a name, return its signal.  */
+enum gdb_signal
+gdb_signal_from_name (const char *name)
+{
+  enum gdb_signal sig;
+
+  /* It's possible we also should allow "SIGCLD" as well as "SIGCHLD"
+     for GDB_SIGNAL_SIGCHLD.  SIGIOT, on the other hand, is more
+     questionable; seems like by now people should call it SIGABRT
+     instead.  */
+
+  /* This ugly cast brought to you by the native VAX compiler.  */
+  for (sig = GDB_SIGNAL_HUP;
+       sig < GDB_SIGNAL_LAST;
+       sig = (enum gdb_signal) ((int) sig + 1))
+    if (signals[sig].name != NULL
+	&& strcmp (name, signals[sig].name) == 0)
+      return sig;
+  return GDB_SIGNAL_UNKNOWN;
+}
+
+/* The following functions are to help certain targets deal
+   with the signal/waitstatus stuff.  They could just as well be in
+   a file called native-utils.c or unixwaitstatus-utils.c or whatever.  */
+
+/* Convert host signal to our signals.  */
+enum gdb_signal
+gdb_signal_from_host (int hostsig)
+{
+  /* A switch statement would make sense but would require special
+     kludges to deal with the cases where more than one signal has the
+     same number.  Signals are ordered ANSI-standard signals first,
+     other signals second, with signals in each block ordered by their
+     numerical values on a typical POSIX platform.  */
+
+  if (hostsig == 0)
+    return GDB_SIGNAL_0;
+
+  /* SIGINT, SIGILL, SIGABRT, SIGFPE, SIGSEGV and SIGTERM
+     are ANSI-standard signals and are always available.  */
+  if (hostsig == SIGINT)
+    return GDB_SIGNAL_INT;
+  if (hostsig == SIGILL)
+    return GDB_SIGNAL_ILL;
+  if (hostsig == SIGABRT)
+    return GDB_SIGNAL_ABRT;
+  if (hostsig == SIGFPE)
+    return GDB_SIGNAL_FPE;
+  if (hostsig == SIGSEGV)
+    return GDB_SIGNAL_SEGV;
+  if (hostsig == SIGTERM)
+    return GDB_SIGNAL_TERM;
+
+  /* All other signals need preprocessor conditionals.  */
+#if defined (SIGHUP)
+  if (hostsig == SIGHUP)
+    return GDB_SIGNAL_HUP;
+#endif
+#if defined (SIGQUIT)
+  if (hostsig == SIGQUIT)
+    return GDB_SIGNAL_QUIT;
+#endif
+#if defined (SIGTRAP)
+  if (hostsig == SIGTRAP)
+    return GDB_SIGNAL_TRAP;
+#endif
+#if defined (SIGEMT)
+  if (hostsig == SIGEMT)
+    return GDB_SIGNAL_EMT;
+#endif
+#if defined (SIGKILL)
+  if (hostsig == SIGKILL)
+    return GDB_SIGNAL_KILL;
+#endif
+#if defined (SIGBUS)
+  if (hostsig == SIGBUS)
+    return GDB_SIGNAL_BUS;
+#endif
+#if defined (SIGSYS)
+  if (hostsig == SIGSYS)
+    return GDB_SIGNAL_SYS;
+#endif
+#if defined (SIGPIPE)
+  if (hostsig == SIGPIPE)
+    return GDB_SIGNAL_PIPE;
+#endif
+#if defined (SIGALRM)
+  if (hostsig == SIGALRM)
+    return GDB_SIGNAL_ALRM;
+#endif
+#if defined (SIGUSR1)
+  if (hostsig == SIGUSR1)
+    return GDB_SIGNAL_USR1;
+#endif
+#if defined (SIGUSR2)
+  if (hostsig == SIGUSR2)
+    return GDB_SIGNAL_USR2;
+#endif
+#if defined (SIGCLD)
+  if (hostsig == SIGCLD)
+    return GDB_SIGNAL_CHLD;
+#endif
+#if defined (SIGCHLD)
+  if (hostsig == SIGCHLD)
+    return GDB_SIGNAL_CHLD;
+#endif
+#if defined (SIGPWR)
+  if (hostsig == SIGPWR)
+    return GDB_SIGNAL_PWR;
+#endif
+#if defined (SIGWINCH)
+  if (hostsig == SIGWINCH)
+    return GDB_SIGNAL_WINCH;
+#endif
+#if defined (SIGURG)
+  if (hostsig == SIGURG)
+    return GDB_SIGNAL_URG;
+#endif
+#if defined (SIGIO)
+  if (hostsig == SIGIO)
+    return GDB_SIGNAL_IO;
+#endif
+#if defined (SIGPOLL)
+  if (hostsig == SIGPOLL)
+    return GDB_SIGNAL_POLL;
+#endif
+#if defined (SIGSTOP)
+  if (hostsig == SIGSTOP)
+    return GDB_SIGNAL_STOP;
+#endif
+#if defined (SIGTSTP)
+  if (hostsig == SIGTSTP)
+    return GDB_SIGNAL_TSTP;
+#endif
+#if defined (SIGCONT)
+  if (hostsig == SIGCONT)
+    return GDB_SIGNAL_CONT;
+#endif
+#if defined (SIGTTIN)
+  if (hostsig == SIGTTIN)
+    return GDB_SIGNAL_TTIN;
+#endif
+#if defined (SIGTTOU)
+  if (hostsig == SIGTTOU)
+    return GDB_SIGNAL_TTOU;
+#endif
+#if defined (SIGVTALRM)
+  if (hostsig == SIGVTALRM)
+    return GDB_SIGNAL_VTALRM;
+#endif
+#if defined (SIGPROF)
+  if (hostsig == SIGPROF)
+    return GDB_SIGNAL_PROF;
+#endif
+#if defined (SIGXCPU)
+  if (hostsig == SIGXCPU)
+    return GDB_SIGNAL_XCPU;
+#endif
+#if defined (SIGXFSZ)
+  if (hostsig == SIGXFSZ)
+    return GDB_SIGNAL_XFSZ;
+#endif
+#if defined (SIGWIND)
+  if (hostsig == SIGWIND)
+    return GDB_SIGNAL_WIND;
+#endif
+#if defined (SIGPHONE)
+  if (hostsig == SIGPHONE)
+    return GDB_SIGNAL_PHONE;
+#endif
+#if defined (SIGLOST)
+  if (hostsig == SIGLOST)
+    return GDB_SIGNAL_LOST;
+#endif
+#if defined (SIGWAITING)
+  if (hostsig == SIGWAITING)
+    return GDB_SIGNAL_WAITING;
+#endif
+#if defined (SIGCANCEL)
+  if (hostsig == SIGCANCEL)
+    return GDB_SIGNAL_CANCEL;
+#endif
+#if defined (SIGLWP)
+  if (hostsig == SIGLWP)
+    return GDB_SIGNAL_LWP;
+#endif
+#if defined (SIGDANGER)
+  if (hostsig == SIGDANGER)
+    return GDB_SIGNAL_DANGER;
+#endif
+#if defined (SIGGRANT)
+  if (hostsig == SIGGRANT)
+    return GDB_SIGNAL_GRANT;
+#endif
+#if defined (SIGRETRACT)
+  if (hostsig == SIGRETRACT)
+    return GDB_SIGNAL_RETRACT;
+#endif
+#if defined (SIGMSG)
+  if (hostsig == SIGMSG)
+    return GDB_SIGNAL_MSG;
+#endif
+#if defined (SIGSOUND)
+  if (hostsig == SIGSOUND)
+    return GDB_SIGNAL_SOUND;
+#endif
+#if defined (SIGSAK)
+  if (hostsig == SIGSAK)
+    return GDB_SIGNAL_SAK;
+#endif
+#if defined (SIGPRIO)
+  if (hostsig == SIGPRIO)
+    return GDB_SIGNAL_PRIO;
+#endif
+
+  /* Mach exceptions.  Assumes that the values for EXC_ are positive! */
+#if defined (EXC_BAD_ACCESS) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BAD_ACCESS)
+    return GDB_EXC_BAD_ACCESS;
+#endif
+#if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BAD_INSTRUCTION)
+    return GDB_EXC_BAD_INSTRUCTION;
+#endif
+#if defined (EXC_ARITHMETIC) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_ARITHMETIC)
+    return GDB_EXC_ARITHMETIC;
+#endif
+#if defined (EXC_EMULATION) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_EMULATION)
+    return GDB_EXC_EMULATION;
+#endif
+#if defined (EXC_SOFTWARE) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_SOFTWARE)
+    return GDB_EXC_SOFTWARE;
+#endif
+#if defined (EXC_BREAKPOINT) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BREAKPOINT)
+    return GDB_EXC_BREAKPOINT;
+#endif
+
+#if defined (SIGINFO)
+  if (hostsig == SIGINFO)
+    return GDB_SIGNAL_INFO;
+#endif
+#if defined (SIGLIBRT)
+  if (hostsig == SIGLIBRT)
+    return GDB_SIGNAL_LIBRT;
+#endif
+
+#if defined (REALTIME_LO)
+  if (hostsig >= REALTIME_LO && hostsig < REALTIME_HI)
+    {
+      /* This block of GDB_SIGNAL_REALTIME value is in order.  */
+      if (33 <= hostsig && hostsig <= 63)
+	return (enum gdb_signal)
+	  (hostsig - 33 + (int) GDB_SIGNAL_REALTIME_33);
+      else if (hostsig == 32)
+	return GDB_SIGNAL_REALTIME_32;
+      else if (64 <= hostsig && hostsig <= 127)
+	return (enum gdb_signal)
+	  (hostsig - 64 + (int) GDB_SIGNAL_REALTIME_64);
+      else
+	error (_("GDB bug: target.c (gdb_signal_from_host): "
+	       "unrecognized real-time signal"));
+    }
+#endif
+
+  return GDB_SIGNAL_UNKNOWN;
+}
+
+/* Convert a OURSIG (an enum gdb_signal) to the form used by the
+   target operating system (refered to as the ``host'') or zero if the
+   equivalent host signal is not available.  Set/clear OURSIG_OK
+   accordingly. */
+
+static int
+do_gdb_signal_to_host (enum gdb_signal oursig,
+			  int *oursig_ok)
+{
+  int retsig;
+  /* Silence the 'not used' warning, for targets that
+     do not support signals.  */
+  (void) retsig;
+
+  /* Signals are ordered ANSI-standard signals first, other signals
+     second, with signals in each block ordered by their numerical
+     values on a typical POSIX platform.  */
+
+  *oursig_ok = 1;
+  switch (oursig)
+    {
+    case GDB_SIGNAL_0:
+      return 0;
+
+      /* SIGINT, SIGILL, SIGABRT, SIGFPE, SIGSEGV and SIGTERM
+	 are ANSI-standard signals and are always available.  */
+    case GDB_SIGNAL_INT:
+      return SIGINT;
+    case GDB_SIGNAL_ILL:
+      return SIGILL;
+    case GDB_SIGNAL_ABRT:
+      return SIGABRT;
+    case GDB_SIGNAL_FPE:
+      return SIGFPE;
+    case GDB_SIGNAL_SEGV:
+      return SIGSEGV;
+    case GDB_SIGNAL_TERM:
+      return SIGTERM;
+
+      /* All other signals need preprocessor conditionals.  */
+#if defined (SIGHUP)
+    case GDB_SIGNAL_HUP:
+      return SIGHUP;
+#endif
+#if defined (SIGQUIT)
+    case GDB_SIGNAL_QUIT:
+      return SIGQUIT;
+#endif
+#if defined (SIGTRAP)
+    case GDB_SIGNAL_TRAP:
+      return SIGTRAP;
+#endif
+#if defined (SIGEMT)
+    case GDB_SIGNAL_EMT:
+      return SIGEMT;
+#endif
+#if defined (SIGKILL)
+    case GDB_SIGNAL_KILL:
+      return SIGKILL;
+#endif
+#if defined (SIGBUS)
+    case GDB_SIGNAL_BUS:
+      return SIGBUS;
+#endif
+#if defined (SIGSYS)
+    case GDB_SIGNAL_SYS:
+      return SIGSYS;
+#endif
+#if defined (SIGPIPE)
+    case GDB_SIGNAL_PIPE:
+      return SIGPIPE;
+#endif
+#if defined (SIGALRM)
+    case GDB_SIGNAL_ALRM:
+      return SIGALRM;
+#endif
+#if defined (SIGUSR1)
+    case GDB_SIGNAL_USR1:
+      return SIGUSR1;
+#endif
+#if defined (SIGUSR2)
+    case GDB_SIGNAL_USR2:
+      return SIGUSR2;
+#endif
+#if defined (SIGCHLD) || defined (SIGCLD)
+    case GDB_SIGNAL_CHLD:
+#if defined (SIGCHLD)
+      return SIGCHLD;
+#else
+      return SIGCLD;
+#endif
+#endif /* SIGCLD or SIGCHLD */
+#if defined (SIGPWR)
+    case GDB_SIGNAL_PWR:
+      return SIGPWR;
+#endif
+#if defined (SIGWINCH)
+    case GDB_SIGNAL_WINCH:
+      return SIGWINCH;
+#endif
+#if defined (SIGURG)
+    case GDB_SIGNAL_URG:
+      return SIGURG;
+#endif
+#if defined (SIGIO)
+    case GDB_SIGNAL_IO:
+      return SIGIO;
+#endif
+#if defined (SIGPOLL)
+    case GDB_SIGNAL_POLL:
+      return SIGPOLL;
+#endif
+#if defined (SIGSTOP)
+    case GDB_SIGNAL_STOP:
+      return SIGSTOP;
+#endif
+#if defined (SIGTSTP)
+    case GDB_SIGNAL_TSTP:
+      return SIGTSTP;
+#endif
+#if defined (SIGCONT)
+    case GDB_SIGNAL_CONT:
+      return SIGCONT;
+#endif
+#if defined (SIGTTIN)
+    case GDB_SIGNAL_TTIN:
+      return SIGTTIN;
+#endif
+#if defined (SIGTTOU)
+    case GDB_SIGNAL_TTOU:
+      return SIGTTOU;
+#endif
+#if defined (SIGVTALRM)
+    case GDB_SIGNAL_VTALRM:
+      return SIGVTALRM;
+#endif
+#if defined (SIGPROF)
+    case GDB_SIGNAL_PROF:
+      return SIGPROF;
+#endif
+#if defined (SIGXCPU)
+    case GDB_SIGNAL_XCPU:
+      return SIGXCPU;
+#endif
+#if defined (SIGXFSZ)
+    case GDB_SIGNAL_XFSZ:
+      return SIGXFSZ;
+#endif
+#if defined (SIGWIND)
+    case GDB_SIGNAL_WIND:
+      return SIGWIND;
+#endif
+#if defined (SIGPHONE)
+    case GDB_SIGNAL_PHONE:
+      return SIGPHONE;
+#endif
+#if defined (SIGLOST)
+    case GDB_SIGNAL_LOST:
+      return SIGLOST;
+#endif
+#if defined (SIGWAITING)
+    case GDB_SIGNAL_WAITING:
+      return SIGWAITING;
+#endif
+#if defined (SIGCANCEL)
+    case GDB_SIGNAL_CANCEL:
+      return SIGCANCEL;
+#endif
+#if defined (SIGLWP)
+    case GDB_SIGNAL_LWP:
+      return SIGLWP;
+#endif
+#if defined (SIGDANGER)
+    case GDB_SIGNAL_DANGER:
+      return SIGDANGER;
+#endif
+#if defined (SIGGRANT)
+    case GDB_SIGNAL_GRANT:
+      return SIGGRANT;
+#endif
+#if defined (SIGRETRACT)
+    case GDB_SIGNAL_RETRACT:
+      return SIGRETRACT;
+#endif
+#if defined (SIGMSG)
+    case GDB_SIGNAL_MSG:
+      return SIGMSG;
+#endif
+#if defined (SIGSOUND)
+    case GDB_SIGNAL_SOUND:
+      return SIGSOUND;
+#endif
+#if defined (SIGSAK)
+    case GDB_SIGNAL_SAK:
+      return SIGSAK;
+#endif
+#if defined (SIGPRIO)
+    case GDB_SIGNAL_PRIO:
+      return SIGPRIO;
+#endif
+
+      /* Mach exceptions.  Assumes that the values for EXC_ are positive! */
+#if defined (EXC_BAD_ACCESS) && defined (_NSIG)
+    case GDB_EXC_BAD_ACCESS:
+      return _NSIG + EXC_BAD_ACCESS;
+#endif
+#if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
+    case GDB_EXC_BAD_INSTRUCTION:
+      return _NSIG + EXC_BAD_INSTRUCTION;
+#endif
+#if defined (EXC_ARITHMETIC) && defined (_NSIG)
+    case GDB_EXC_ARITHMETIC:
+      return _NSIG + EXC_ARITHMETIC;
+#endif
+#if defined (EXC_EMULATION) && defined (_NSIG)
+    case GDB_EXC_EMULATION:
+      return _NSIG + EXC_EMULATION;
+#endif
+#if defined (EXC_SOFTWARE) && defined (_NSIG)
+    case GDB_EXC_SOFTWARE:
+      return _NSIG + EXC_SOFTWARE;
+#endif
+#if defined (EXC_BREAKPOINT) && defined (_NSIG)
+    case GDB_EXC_BREAKPOINT:
+      return _NSIG + EXC_BREAKPOINT;
+#endif
+
+#if defined (SIGINFO)
+    case GDB_SIGNAL_INFO:
+      return SIGINFO;
+#endif
+#if defined (SIGLIBRT)
+    case GDB_SIGNAL_LIBRT:
+      return SIGLIBRT;
+#endif
+
+    default:
+#if defined (REALTIME_LO)
+      retsig = 0;
+
+      if (oursig >= GDB_SIGNAL_REALTIME_33
+	  && oursig <= GDB_SIGNAL_REALTIME_63)
+	{
+	  /* This block of signals is continuous, and
+             GDB_SIGNAL_REALTIME_33 is 33 by definition.  */
+	  retsig = (int) oursig - (int) GDB_SIGNAL_REALTIME_33 + 33;
+	}
+      else if (oursig == GDB_SIGNAL_REALTIME_32)
+	{
+	  /* GDB_SIGNAL_REALTIME_32 isn't contiguous with
+             GDB_SIGNAL_REALTIME_33.  It is 32 by definition.  */
+	  retsig = 32;
+	}
+      else if (oursig >= GDB_SIGNAL_REALTIME_64
+	  && oursig <= GDB_SIGNAL_REALTIME_127)
+	{
+	  /* This block of signals is continuous, and
+             GDB_SIGNAL_REALTIME_64 is 64 by definition.  */
+	  retsig = (int) oursig - (int) GDB_SIGNAL_REALTIME_64 + 64;
+	}
+
+      if (retsig >= REALTIME_LO && retsig < REALTIME_HI)
+	return retsig;
+#endif
+
+      *oursig_ok = 0;
+      return 0;
+    }
+}
+
+int
+gdb_signal_to_host_p (enum gdb_signal oursig)
+{
+  int oursig_ok;
+  do_gdb_signal_to_host (oursig, &oursig_ok);
+  return oursig_ok;
+}
+
+int
+gdb_signal_to_host (enum gdb_signal oursig)
+{
+  int oursig_ok;
+  int targ_signo = do_gdb_signal_to_host (oursig, &oursig_ok);
+  if (!oursig_ok)
+    {
+      /* The user might be trying to do "signal SIGSAK" where this system
+         doesn't have SIGSAK.  */
+      warning (_("Signal %s does not exist on this system."),
+	       gdb_signal_to_name (oursig));
+      return 0;
+    }
+  else
+    return targ_signo;
+}