Move gdbsupport to the top level

This patch moves the gdbsupport directory to the top level.  This is
the next step in the ongoing project to move gdbserver to the top
level.

The bulk of this patch was created by "git mv gdb/gdbsupport gdbsupport".

This patch then adds a build system to gdbsupport and wires it into
the top level.  Then it changes gdb to use the top-level build.

gdbserver, on the other hand, is not yet changed.  It still does its
own build of gdbsupport.

ChangeLog
2020-01-14  Tom Tromey  <tom@tromey.com>

	* src-release.sh (GDB_SUPPORT_DIRS): Add gdbsupport.
	* MAINTAINERS: Add gdbsupport.
	* configure: Rebuild.
	* configure.ac (configdirs): Add gdbsupport.
	* gdbsupport: New directory, move from gdb/gdbsupport.
	* Makefile.def (host_modules, dependencies): Add gnulib.
	* Makefile.in: Rebuild.

gdb/ChangeLog
2020-01-14  Tom Tromey  <tom@tromey.com>

	* nat/x86-linux-dregs.c: Include configh.h.
	* nat/linux-ptrace.c: Include configh.h.
	* nat/linux-btrace.c: Include configh.h.
	* defs.h: Include config.h, bfd.h.
	* configure.ac: Don't source common.host.
	(CONFIG_OBS, CONFIG_SRCS): Remove gdbsupport files.
	* configure: Rebuild.
	* acinclude.m4: Update path.
	* Makefile.in (SUPPORT, LIBSUPPORT, INCSUPPORT): New variables.
	(CONFIG_SRC_SUBDIR): Remove gdbsupport.
	(INTERNAL_CFLAGS_BASE): Add INCSUPPORT.
	(CLIBS): Add LIBSUPPORT.
	(CDEPS): Likewise.
	(COMMON_SFILES): Remove gdbsupport files.
	(HFILES_NO_SRCDIR): Likewise.
	(stamp-version): Update path to create-version.sh.
	(ALLDEPFILES): Remove gdbsupport files.

gdb/gdbserver/ChangeLog
2020-01-14  Tom Tromey  <tom@tromey.com>

	* server.h: Include config.h.
	* gdbreplay.c: Include config.h.
	* configure: Rebuild.
	* configure.ac: Don't source common.host.
	* acinclude.m4: Update path.
	* Makefile.in (INCSUPPORT): New variable.
	(INCLUDE_CFLAGS): Add INCSUPPORT.
	(SFILES): Update paths.
	(version-generated.c): Update path to create-version.sh.
	(gdbsupport/%-ipa.o, gdbsupport/%.o): Update paths.

gdbsupport/ChangeLog
2020-01-14  Tom Tromey  <tom@tromey.com>

	* common-defs.h: Add GDBSERVER case.  Update includes.
	* acinclude.m4, aclocal.m4, config.in, configure, configure.ac,
	Makefile.am, Makefile.in, README: New files.
	* Moved from ../gdb/gdbsupport/

Change-Id: I07632e7798635c1bab389bf885971e584fb4bb78

1 files changed, 417 insertions, 0 deletions

diff --git a/gdbsupport/common-utils.c b/gdbsupport/common-utils.c
new file mode 100644
index 0000000..ed05d61
--- /dev/null
+++ b/gdbsupport/common-utils.c
@@ -0,0 +1,417 @@
+/* Shared general utility routines for GDB, the GNU debugger.
+
+   Copyright (C) 1986-2020 Free Software Foundation, Inc.
+
+   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"
+#include "common-utils.h"
+#include "host-defs.h"
+#include <ctype.h>
+
+void *
+xzalloc (size_t size)
+{
+  return xcalloc (1, size);
+}
+
+/* Like asprintf/vasprintf but get an internal_error if the call
+   fails. */
+
+char *
+xstrprintf (const char *format, ...)
+{
+  char *ret;
+  va_list args;
+
+  va_start (args, format);
+  ret = xstrvprintf (format, args);
+  va_end (args);
+  return ret;
+}
+
+char *
+xstrvprintf (const char *format, va_list ap)
+{
+  char *ret = NULL;
+  int status = vasprintf (&ret, format, ap);
+
+  /* NULL is returned when there was a memory allocation problem, or
+     any other error (for instance, a bad format string).  A negative
+     status (the printed length) with a non-NULL buffer should never
+     happen, but just to be sure.  */
+  if (ret == NULL || status < 0)
+    internal_error (__FILE__, __LINE__, _("vasprintf call failed"));
+  return ret;
+}
+
+int
+xsnprintf (char *str, size_t size, const char *format, ...)
+{
+  va_list args;
+  int ret;
+
+  va_start (args, format);
+  ret = vsnprintf (str, size, format, args);
+  gdb_assert (ret < size);
+  va_end (args);
+
+  return ret;
+}
+
+/* See documentation in common-utils.h.  */
+
+std::string
+string_printf (const char* fmt, ...)
+{
+  va_list vp;
+  int size;
+
+  va_start (vp, fmt);
+  size = vsnprintf (NULL, 0, fmt, vp);
+  va_end (vp);
+
+  std::string str (size, '\0');
+
+  /* C++11 and later guarantee std::string uses contiguous memory and
+     always includes the terminating '\0'.  */
+  va_start (vp, fmt);
+  vsprintf (&str[0], fmt, vp);	/* ARI: vsprintf */
+  va_end (vp);
+
+  return str;
+}
+
+/* See documentation in common-utils.h.  */
+
+std::string
+string_vprintf (const char* fmt, va_list args)
+{
+  va_list vp;
+  size_t size;
+
+  va_copy (vp, args);
+  size = vsnprintf (NULL, 0, fmt, vp);
+  va_end (vp);
+
+  std::string str (size, '\0');
+
+  /* C++11 and later guarantee std::string uses contiguous memory and
+     always includes the terminating '\0'.  */
+  vsprintf (&str[0], fmt, args); /* ARI: vsprintf */
+
+  return str;
+}
+
+
+/* See documentation in common-utils.h.  */
+
+void
+string_appendf (std::string &str, const char *fmt, ...)
+{
+  va_list vp;
+
+  va_start (vp, fmt);
+  string_vappendf (str, fmt, vp);
+  va_end (vp);
+}
+
+
+/* See documentation in common-utils.h.  */
+
+void
+string_vappendf (std::string &str, const char *fmt, va_list args)
+{
+  va_list vp;
+  int grow_size;
+
+  va_copy (vp, args);
+  grow_size = vsnprintf (NULL, 0, fmt, vp);
+  va_end (vp);
+
+  size_t curr_size = str.size ();
+  str.resize (curr_size + grow_size);
+
+  /* C++11 and later guarantee std::string uses contiguous memory and
+     always includes the terminating '\0'.  */
+  vsprintf (&str[curr_size], fmt, args); /* ARI: vsprintf */
+}
+
+char *
+savestring (const char *ptr, size_t len)
+{
+  char *p = (char *) xmalloc (len + 1);
+
+  memcpy (p, ptr, len);
+  p[len] = 0;
+  return p;
+}
+
+/* See documentation in common-utils.h.  */
+
+std::string
+extract_string_maybe_quoted (const char **arg)
+{
+  bool squote = false;
+  bool dquote = false;
+  bool bsquote = false;
+  std::string result;
+  const char *p = *arg;
+
+  /* Find the start of the argument.  */
+  p = skip_spaces (p);
+
+  /* Parse p similarly to gdb_argv buildargv function.  */
+  while (*p != '\0')
+    {
+      if (isspace (*p) && !squote && !dquote && !bsquote)
+	break;
+      else
+	{
+	  if (bsquote)
+	    {
+	      bsquote = false;
+	      result += *p;
+	    }
+	  else if (*p == '\\')
+	    bsquote = true;
+	  else if (squote)
+	    {
+	      if (*p == '\'')
+		squote = false;
+	      else
+		result += *p;
+	    }
+	  else if (dquote)
+	    {
+	      if (*p == '"')
+		dquote = false;
+	      else
+		result += *p;
+	    }
+	  else
+	    {
+	      if (*p == '\'')
+		squote = true;
+	      else if (*p == '"')
+		dquote = true;
+	      else
+		result += *p;
+	    }
+	  p++;
+	}
+    }
+
+  *arg = p;
+  return result;
+}
+
+/* The bit offset of the highest byte in a ULONGEST, for overflow
+   checking.  */
+
+#define HIGH_BYTE_POSN ((sizeof (ULONGEST) - 1) * HOST_CHAR_BIT)
+
+/* True (non-zero) iff DIGIT is a valid digit in radix BASE,
+   where 2 <= BASE <= 36.  */
+
+static int
+is_digit_in_base (unsigned char digit, int base)
+{
+  if (!isalnum (digit))
+    return 0;
+  if (base <= 10)
+    return (isdigit (digit) && digit < base + '0');
+  else
+    return (isdigit (digit) || tolower (digit) < base - 10 + 'a');
+}
+
+static int
+digit_to_int (unsigned char c)
+{
+  if (isdigit (c))
+    return c - '0';
+  else
+    return tolower (c) - 'a' + 10;
+}
+
+/* As for strtoul, but for ULONGEST results.  */
+
+ULONGEST
+strtoulst (const char *num, const char **trailer, int base)
+{
+  unsigned int high_part;
+  ULONGEST result;
+  int minus = 0;
+  int i = 0;
+
+  /* Skip leading whitespace.  */
+  while (isspace (num[i]))
+    i++;
+
+  /* Handle prefixes.  */
+  if (num[i] == '+')
+    i++;
+  else if (num[i] == '-')
+    {
+      minus = 1;
+      i++;
+    }
+
+  if (base == 0 || base == 16)
+    {
+      if (num[i] == '0' && (num[i + 1] == 'x' || num[i + 1] == 'X'))
+	{
+	  i += 2;
+	  if (base == 0)
+	    base = 16;
+	}
+    }
+
+  if (base == 0 && num[i] == '0')
+    base = 8;
+
+  if (base == 0)
+    base = 10;
+
+  if (base < 2 || base > 36)
+    {
+      errno = EINVAL;
+      return 0;
+    }
+
+  result = high_part = 0;
+  for (; is_digit_in_base (num[i], base); i += 1)
+    {
+      result = result * base + digit_to_int (num[i]);
+      high_part = high_part * base + (unsigned int) (result >> HIGH_BYTE_POSN);
+      result &= ((ULONGEST) 1 << HIGH_BYTE_POSN) - 1;
+      if (high_part > 0xff)
+	{
+	  errno = ERANGE;
+	  result = ~ (ULONGEST) 0;
+	  high_part = 0;
+	  minus = 0;
+	  break;
+	}
+    }
+
+  if (trailer != NULL)
+    *trailer = &num[i];
+
+  result = result + ((ULONGEST) high_part << HIGH_BYTE_POSN);
+  if (minus)
+    return -result;
+  else
+    return result;
+}
+
+/* See documentation in common-utils.h.  */
+
+char *
+skip_spaces (char *chp)
+{
+  if (chp == NULL)
+    return NULL;
+  while (*chp && isspace (*chp))
+    chp++;
+  return chp;
+}
+
+/* A const-correct version of the above.  */
+
+const char *
+skip_spaces (const char *chp)
+{
+  if (chp == NULL)
+    return NULL;
+  while (*chp && isspace (*chp))
+    chp++;
+  return chp;
+}
+
+/* See documentation in common-utils.h.  */
+
+const char *
+skip_to_space (const char *chp)
+{
+  if (chp == NULL)
+    return NULL;
+  while (*chp && !isspace (*chp))
+    chp++;
+  return chp;
+}
+
+/* See documentation in common-utils.h.  */
+
+char *
+skip_to_space (char *chp)
+{
+  return (char *) skip_to_space ((const char *) chp);
+}
+
+/* See gdbsupport/common-utils.h.  */
+
+void
+free_vector_argv (std::vector<char *> &v)
+{
+  for (char *el : v)
+    xfree (el);
+
+  v.clear ();
+}
+
+/* See gdbsupport/common-utils.h.  */
+
+std::string
+stringify_argv (const std::vector<char *> &args)
+{
+  std::string ret;
+
+  if (!args.empty () && args[0] != NULL)
+    {
+      for (auto s : args)
+	if (s != NULL)
+	  {
+	    ret += s;
+	    ret += ' ';
+	  }
+
+      /* Erase the last whitespace.  */
+      ret.erase (ret.end () - 1);
+    }
+
+  return ret;
+}
+
+/* See gdbsupport/common-utils.h.  */
+
+ULONGEST
+align_up (ULONGEST v, int n)
+{
+  /* Check that N is really a power of two.  */
+  gdb_assert (n && (n & (n-1)) == 0);
+  return (v + n - 1) & -n;
+}
+
+/* See gdbsupport/common-utils.h.  */
+
+ULONGEST
+align_down (ULONGEST v, int n)
+{
+  /* Check that N is really a power of two.  */
+  gdb_assert (n && (n & (n-1)) == 0);
+  return (v & -n);
+}