Sync libiberty with upstream GCC.

include/ChangeLog
	* libiberty.h (PEX_STDOUT_APPEND): New flag.
	(PEX_STDERR_APPEND): Likewise.

	* demangle.h (DMGL_DLANG): New macro.
	(DMGL_STYLE_MASK): Add DMGL_DLANG.
	(demangling_styles): Add dlang_demangling.
	(DLANG_DEMANGLING_STYLE_STRING): New macro.
	(DLANG_DEMANGLING): New macro.
	(dlang_demangle): New prototype.

	* longlong.h: Add __udiv_w_sdiv prototype.

libiberty/ChangeLog
	* cp-demangle.c (d_substitution): Handle abi tags on abbreviation.

	* pex-common.h (struct pex_funcs): Add new parameter for open_write field.
	* pex-unix.c (pex_unix_open_write): Add support for new parameter.
	* pex-djgpp.c (pex_djgpp_open_write): Likewise.
	* pex-win32.c (pex_win32_open_write): Likewise.
	* pex-common.c (pex_run_in_environment): Likewise.

	* Makefile.in (CFILES): Add d-demangle.c.
	(REQUIRED_OFILES): Add d-demangle.o.
	* cplus-dem.c (libiberty_demanglers): Add dlang_demangling case.
	(cplus_demangle): Likewise.
	* d-demangle.c: New file.
	* testsuite/Makefile.in (really-check): Add check-d-demangle.
	* testsuite/d-demangle-expected: New file.

	* simple-object-elf.c (simple_object_elf_write_ehdr): Correctly
	handle objects with more than SHN_LORESERVE sections.
	(simple_object_elf_write_shdr): Add sh_link parameter.
	(simple_object_elf_write_to_file): Correctly handle objects with
	more than SHN_LORESERVE sections.

	* cp-demangle.c (d_dump): Only access field from s_fixed part of
	the union for DEMANGLE_COMPONENT_FIXED_TYPE.
	(d_count_templates_scopes): Likewise.

	* testsuite/demangler-fuzzer.c: New file.
	* testsuite/Makefile.in (fuzz-demangler): New rule.
	(demangler-fuzzer): Likewise.
	(mostlyclean): Clean up demangler fuzzer.

1 files changed, 1338 insertions, 0 deletions

diff --git a/libiberty/d-demangle.c b/libiberty/d-demangle.c
new file mode 100644
index 0000000..d31bf94
--- /dev/null
+++ b/libiberty/d-demangle.c
@@ -0,0 +1,1338 @@
+/* Demangler for the D programming language
+   Copyright 2014 Free Software Foundation, Inc.
+   Written by Iain Buclaw (ibuclaw@gdcproject.org)
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+In addition to the permissions in the GNU Library General Public
+License, the Free Software Foundation gives you unlimited permission
+to link the compiled version of this file into combinations with other
+programs, and to distribute those combinations without any restriction
+coming from the use of this file.  (The Library Public License
+restrictions do apply in other respects; for example, they cover
+modification of the file, and distribution when not linked into a
+combined executable.)
+
+Libiberty 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB.
+If not, see <http://www.gnu.org/licenses/>.  */
+
+/* This file exports one function; dlang_demangle.
+
+   This file imports strtol and strtold for decoding mangled literals.  */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "safe-ctype.h"
+
+#include <sys/types.h>
+#include <string.h>
+#include <stdio.h>
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#else
+extern long strtol (const char *nptr, char **endptr, int base);
+extern long double strtold (const char *nptr, char **endptr);
+#endif
+
+#include <demangle.h>
+#include "libiberty.h"
+
+/* A mini string-handling package */
+
+typedef struct string		/* Beware: these aren't required to be */
+{				/*  '\0' terminated.  */
+  char *b;			/* pointer to start of string */
+  char *p;			/* pointer after last character */
+  char *e;			/* pointer after end of allocated space */
+} string;
+
+static void
+string_need (string *s, int n)
+{
+  int tem;
+
+  if (s->b == NULL)
+    {
+      if (n < 32)
+	{
+	  n = 32;
+	}
+      s->p = s->b = XNEWVEC (char, n);
+      s->e = s->b + n;
+    }
+  else if (s->e - s->p < n)
+    {
+      tem = s->p - s->b;
+      n += tem;
+      n *= 2;
+      s->b = XRESIZEVEC (char, s->b, n);
+      s->p = s->b + tem;
+      s->e = s->b + n;
+    }
+}
+
+static void
+string_delete (string *s)
+{
+  if (s->b != NULL)
+    {
+      XDELETEVEC (s->b);
+      s->b = s->e = s->p = NULL;
+    }
+}
+
+static void
+string_init (string *s)
+{
+  s->b = s->p = s->e = NULL;
+}
+
+static int
+string_length (string *s)
+{
+  if (s->p == s->b)
+    {
+      return 0;
+    }
+  return s->p - s->b;
+}
+
+static void
+string_setlength (string *s, int n)
+{
+  if (n - string_length (s) < 0)
+    {
+      s->p = s->b + n;
+    }
+}
+
+static void
+string_append (string *p, const char *s)
+{
+  int n = strlen (s);
+  string_need (p, n);
+  memcpy (p->p, s, n);
+  p->p += n;
+}
+
+static void
+string_appendn (string *p, const char *s, int n)
+{
+  if (n != 0)
+    {
+      string_need (p, n);
+      memcpy (p->p, s, n);
+      p->p += n;
+    }
+}
+
+static void
+string_prependn (string *p, const char *s, int n)
+{
+  char *q;
+
+  if (n != 0)
+    {
+      string_need (p, n);
+      for (q = p->p - 1; q >= p->b; q--)
+	{
+	  q[n] = q[0];
+	}
+      memcpy (p->b, s, n);
+      p->p += n;
+    }
+}
+
+static void
+string_prepend (string *p, const char *s)
+{
+  if (s != NULL && *s != '\0')
+    {
+      string_prependn (p, s, strlen (s));
+    }
+}
+
+/* Prototypes for forward referenced functions */
+static const char *dlang_function_args (string *, const char *);
+
+static const char *dlang_type (string *, const char *);
+
+static const char *dlang_value (string *, const char *, const char *, char);
+
+static const char *dlang_parse_symbol (string *, const char *);
+
+static const char *dlang_parse_tuple (string *, const char *);
+
+static const char *dlang_parse_template (string *, const char *, long);
+
+
+/* Demangle the calling convention from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_call_convention (string *decl, const char *mangled)
+{
+  if (mangled == NULL || *mangled == '\0')
+    return mangled;
+
+  switch (*mangled)
+    {
+    case 'F': /* (D) */
+      mangled++;
+      break;
+    case 'U': /* (C) */
+      mangled++;
+      string_append (decl, "extern(C) ");
+      break;
+    case 'W': /* (Windows) */
+      mangled++;
+      string_append (decl, "extern(Windows) ");
+      break;
+    case 'V': /* (Pascal) */
+      mangled++;
+      string_append (decl, "extern(Pascal) ");
+      break;
+    case 'R': /* (C++) */
+      mangled++;
+      string_append (decl, "extern(C++) ");
+      break;
+    default:
+      return NULL;
+    }
+
+  return mangled;
+}
+
+/* Demangle the D function attributes from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_attributes (string *decl, const char *mangled)
+{
+  if (mangled == NULL || *mangled == '\0')
+    return mangled;
+
+  while (*mangled == 'N')
+    {
+      mangled++;
+      switch (*mangled)
+	{
+	case 'a': /* pure */
+	  mangled++;
+	  string_append (decl, "pure ");
+	  continue;
+	case 'b': /* nothrow */
+	  mangled++;
+	  string_append (decl, "nothrow ");
+	  continue;
+	case 'c': /* ref */
+	  mangled++;
+	  string_append (decl, "ref ");
+	  continue;
+	case 'd': /* @property */
+	  mangled++;
+	  string_append (decl, "@property ");
+	  continue;
+	case 'e': /* @trusted */
+	  mangled++;
+	  string_append (decl, "@trusted ");
+	  continue;
+	case 'f': /* @safe */
+	  mangled++;
+	  string_append (decl, "@safe ");
+	  continue;
+	case 'g':
+	case 'h':
+	  /* inout parameter is represented as 'Ng'.
+	     vector parameter is represented as 'Nh'.
+	     If we see this, then we know we're really in the
+	     parameter list.  Rewind and break.  */
+	  mangled--;
+	  break;
+	case 'i': /* @nogc */
+	  mangled++;
+	  string_append (decl, "@nogc ");
+	  continue;
+	}
+      break;
+    }
+
+  return mangled;
+}
+
+/* Demangle the function type from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_function_type (string *decl, const char *mangled)
+{
+  string attr, args, type;
+  size_t szattr, szargs, sztype;
+
+  if (mangled == NULL || *mangled == '\0')
+    return mangled;
+
+  /* The order of the mangled string is:
+	CallConvention FuncAttrs Arguments ArgClose Type
+
+     The demangled string is re-ordered as:
+	CallConvention Type Arguments FuncAttrs
+   */
+  string_init (&attr);
+  string_init (&args);
+  string_init (&type);
+
+  /* Function call convention.  */
+  mangled = dlang_call_convention (decl, mangled);
+
+  /* Function attributes.  */
+  mangled = dlang_attributes (&attr, mangled);
+  szattr = string_length (&attr);
+
+  /* Function arguments.  */
+  mangled = dlang_function_args (&args, mangled);
+  szargs = string_length (&args);
+
+  /* Function return type.  */
+  mangled = dlang_type (&type, mangled);
+  sztype = string_length (&type);
+
+  /* Append to decl in order. */
+  string_appendn (decl, type.b, sztype);
+  string_append (decl, "(");
+  string_appendn (decl, args.b, szargs);
+  string_append (decl, ") ");
+  string_appendn (decl, attr.b, szattr);
+
+  string_delete (&attr);
+  string_delete (&args);
+  string_delete (&type);
+  return mangled;
+}
+
+/* Demangle the argument list from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_function_args (string *decl, const char *mangled)
+{
+  size_t n = 0;
+
+  while (mangled && *mangled != '\0')
+    {
+      switch (*mangled)
+	{
+	case 'X': /* (variadic T t...) style.  */
+	  mangled++;
+	  string_append (decl, "...");
+	  return mangled;
+	case 'Y': /* (variadic T t, ...) style.  */
+	  mangled++;
+	  string_append (decl, ", ...");
+	  return mangled;
+	case 'Z': /* Normal function.  */
+	  mangled++;
+	  return mangled;
+	}
+
+      if (n++)
+	string_append (decl, ", ");
+
+      if (*mangled == 'M') /* scope(T) */
+	{
+	  mangled++;
+	  string_append (decl, "scope ");
+	}
+
+      switch (*mangled)
+	{
+	case 'J': /* out(T) */
+	  mangled++;
+	  string_append (decl, "out ");
+	  break;
+	case 'K': /* ref(T) */
+	  mangled++;
+	  string_append (decl, "ref ");
+	  break;
+	case 'L': /* lazy(T) */
+	  mangled++;
+	  string_append (decl, "lazy ");
+	  break;
+	}
+      mangled = dlang_type (decl, mangled);
+    }
+
+  return mangled;
+}
+
+/* Demangle the type from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_type (string *decl, const char *mangled)
+{
+  if (mangled == NULL || *mangled == '\0')
+    return mangled;
+
+  switch (*mangled)
+    {
+    case 'O': /* shared(T) */
+      mangled++;
+      string_append (decl, "shared(");
+      mangled = dlang_type (decl, mangled);
+      string_append (decl, ")");
+      return mangled;
+    case 'x': /* const(T) */
+      mangled++;
+      string_append (decl, "const(");
+      mangled = dlang_type (decl, mangled);
+      string_append (decl, ")");
+      return mangled;
+    case 'y': /* immutable(T) */
+      mangled++;
+      string_append (decl, "immutable(");
+      mangled = dlang_type (decl, mangled);
+      string_append (decl, ")");
+      return mangled;
+    case 'N':
+      mangled++;
+      if (*mangled == 'g') /* wild(T) */
+	{
+	  mangled++;
+	  string_append (decl, "inout(");
+	  mangled = dlang_type (decl, mangled);
+	  string_append (decl, ")");
+	  return mangled;
+	}
+      else if (*mangled == 'h') /* vector(T) */
+	{
+	  mangled++;
+	  string_append (decl, "__vector(");
+	  mangled = dlang_type (decl, mangled);
+	  string_append (decl, ")");
+	  return mangled;
+	}
+      else
+	return NULL;
+    case 'A': /* dynamic array (T[]) */
+      mangled++;
+      mangled = dlang_type (decl, mangled);
+      string_append (decl, "[]");
+      return mangled;
+    case 'G': /* static array (T[N]) */
+    {
+      const char *numptr;
+      size_t num = 0;
+      mangled++;
+
+      numptr = mangled;
+      while (ISDIGIT (*mangled))
+	{
+	  num++;
+	  mangled++;
+	}
+      mangled = dlang_type (decl, mangled);
+      string_append (decl, "[");
+      string_appendn (decl, numptr, num);
+      string_append (decl, "]");
+      return mangled;
+    }
+    case 'H': /* associative array (T[T]) */
+    {
+      string type;
+      size_t sztype;
+      mangled++;
+
+      string_init (&type);
+      mangled = dlang_type (&type, mangled);
+      sztype = string_length (&type);
+
+      mangled = dlang_type (decl, mangled);
+      string_append (decl, "[");
+      string_appendn (decl, type.b, sztype);
+      string_append (decl, "]");
+
+      string_delete (&type);
+      return mangled;
+    }
+    case 'P': /* pointer (T*) */
+      mangled++;
+      mangled = dlang_type (decl, mangled);
+      string_append (decl, "*");
+      return mangled;
+    case 'I': /* ident T */
+    case 'C': /* class T */
+    case 'S': /* struct T */
+    case 'E': /* enum T */
+    case 'T': /* typedef T */
+      mangled++;
+      return dlang_parse_symbol (decl, mangled);
+    case 'D': /* delegate T */
+      mangled++;
+      mangled = dlang_function_type (decl, mangled);
+      string_append (decl, "delegate");
+      return mangled;
+    case 'B': /* tuple T */
+      mangled++;
+      return dlang_parse_tuple (decl, mangled);
+
+    /* Function types */
+    case 'F': case 'U': case 'W':
+    case 'V': case 'R':
+      mangled = dlang_function_type (decl, mangled);
+      string_append (decl, "function");
+      return mangled;
+
+    /* Basic types */
+    case 'n':
+      mangled++;
+      string_append (decl, "none");
+      return mangled;
+    case 'v':
+      mangled++;
+      string_append (decl, "void");
+      return mangled;
+    case 'g':
+      mangled++;
+      string_append (decl, "byte");
+      return mangled;
+    case 'h':
+      mangled++;
+      string_append (decl, "ubyte");
+      return mangled;
+    case 's':
+      mangled++;
+      string_append (decl, "short");
+      return mangled;
+    case 't':
+      mangled++;
+      string_append (decl, "ushort");
+      return mangled;
+    case 'i':
+      mangled++;
+      string_append (decl, "int");
+      return mangled;
+    case 'k':
+      mangled++;
+      string_append (decl, "uint");
+      return mangled;
+    case 'l':
+      mangled++;
+      string_append (decl, "long");
+      return mangled;
+    case 'm':
+      mangled++;
+      string_append (decl, "ulong");
+      return mangled;
+    case 'f':
+      mangled++;
+      string_append (decl, "float");
+      return mangled;
+    case 'd':
+      mangled++;
+      string_append (decl, "double");
+      return mangled;
+    case 'e':
+      mangled++;
+      string_append (decl, "real");
+      return mangled;
+
+    /* Imaginary and Complex types */
+    case 'o':
+      mangled++;
+      string_append (decl, "ifloat");
+      return mangled;
+    case 'p':
+      mangled++;
+      string_append (decl, "idouble");
+      return mangled;
+    case 'j':
+      mangled++;
+      string_append (decl, "ireal");
+      return mangled;
+    case 'q':
+      mangled++;
+      string_append (decl, "cfloat");
+      return mangled;
+    case 'r':
+      mangled++;
+      string_append (decl, "cdouble");
+      return mangled;
+    case 'c':
+      mangled++;
+      string_append (decl, "creal");
+      return mangled;
+
+    /* Other types */
+    case 'b':
+      mangled++;
+      string_append (decl, "bool");
+      return mangled;
+    case 'a':
+      mangled++;
+      string_append (decl, "char");
+      return mangled;
+    case 'u':
+      mangled++;
+      string_append (decl, "wchar");
+      return mangled;
+    case 'w':
+      mangled++;
+      string_append (decl, "dchar");
+      return mangled;
+
+    default: /* unhandled */
+      return NULL;
+    }
+}
+
+/* Extract the identifier from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_identifier (string *decl, const char *mangled)
+{
+  if (mangled == NULL || *mangled == '\0')
+    return mangled;
+
+  if (ISDIGIT (*mangled))
+    {
+      char *endptr;
+      long i = strtol (mangled, &endptr, 10);
+
+      if (endptr == NULL || i <= 0 || strlen (endptr) < (size_t) i)
+	return NULL;
+
+      mangled = endptr;
+
+      /* May be a template instance.  */
+      if (i >= 5 && strncmp (mangled, "__T", 3) == 0)
+	{
+	  /* Template symbol.  */
+	  if (ISDIGIT (mangled[3]) && mangled[3] != '0')
+	    return dlang_parse_template (decl, mangled, i);
+
+	  return NULL;
+	}
+
+      if (strncmp (mangled, "__ctor", i) == 0)
+	{
+	  /* Constructor symbol for a class/struct.  */
+	  string_append (decl, "this");
+	  mangled += i;
+	  return mangled;
+	}
+      else if (strncmp (mangled, "__dtor", i) == 0)
+	{
+	  /* Destructor symbol for a class/struct.  */
+	  string_append (decl, "~this");
+	  mangled += i;
+	  return mangled;
+	}
+      else if (strncmp (mangled, "__postblit", i) == 0)
+	{
+	  /* Postblit symbol for a struct.  */
+	  string_append (decl, "this(this)");
+	  mangled += i;
+	  return mangled;
+	}
+      else if (strncmp (mangled, "__initZ", i+1) == 0)
+	{
+	  /* The static initialiser for a given symbol.  */
+	  string_append (decl, "init$");
+	  mangled += i + 1;
+	  return mangled;
+	}
+      else if (strncmp (mangled, "__ClassZ", i+1) == 0)
+	{
+	  /* The classinfo symbol for a given class.  */
+	  string_prepend (decl, "ClassInfo for ");
+	  string_setlength (decl, string_length (decl) - 1);
+	  mangled += i + 1;
+	  return mangled;
+	}
+      else if (strncmp (mangled, "__vtblZ", i+1) == 0)
+	{
+	  /* The vtable symbol for a given class.  */
+	  string_prepend (decl, "vtable for ");
+	  string_setlength (decl, string_length (decl) - 1);
+	  mangled += i + 1;
+	  return mangled;
+	}
+      else if (strncmp (mangled, "__InterfaceZ", i+1) == 0)
+	{
+	  /* The interface symbol for a given class.  */
+	  string_prepend (decl, "Interface for ");
+	  string_setlength (decl, string_length (decl) - 1);
+	  mangled += i + 1;
+	  return mangled;
+	}
+      else if (strncmp (mangled, "__ModuleInfoZ", i+1) == 0)
+	{
+	  /* The ModuleInfo symbol for a given module.  */
+	  string_prepend (decl, "ModuleInfo for ");
+	  string_setlength (decl, string_length (decl) - 1);
+	  mangled += i + 1;
+	  return mangled;
+	}
+
+      string_appendn (decl, mangled, i);
+      mangled += i;
+    }
+  else
+    return NULL;
+
+  return mangled;
+}
+
+/* Extract the integer value from MANGLED and append it to DECL,
+   where TYPE is the type it should be represented as.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_parse_integer (string *decl, const char *mangled, char type)
+{
+  if (type == 'a' || type == 'u' || type == 'w')
+    {
+      /* Parse character value.  */
+      char value[10];
+      int pos = 10;
+      int width = 0;
+      char *endptr;
+      long val = strtol (mangled, &endptr, 10);
+
+      if (endptr == NULL || val < 0)
+	return NULL;
+
+      string_append (decl, "'");
+
+      if (type == 'a' && val >= 0x20 && val < 0x7F)
+	{
+	  /* Represent as a character literal.  */
+	  char c = (char) val;
+	  string_appendn (decl, &c, 1);
+	}
+      else
+	{
+	  /* Represent as a hexadecimal value.  */
+	  switch (type)
+	    {
+	    case 'a': /* char */
+	      string_append (decl, "\\x");
+	      width = 2;
+	      break;
+	    case 'u': /* wchar */
+	      string_append (decl, "\\u");
+	      width = 4;
+	      break;
+	    case 'w': /* dchar */
+	      string_append (decl, "\\U");
+	      width = 8;
+	      break;
+	    }
+
+	  while (val > 0)
+	    {
+	      int digit = val % 16;
+
+	      if (digit < 10)
+		value[--pos] = (char)(digit + '0');
+	      else
+		value[--pos] = (char)((digit - 10) + 'a');
+
+	      val /= 16;
+	      width--;
+	    }
+
+	  for (; width > 0; width--)
+	    value[--pos] = '0';
+
+	  string_appendn (decl, &(value[pos]), 10 - pos);
+	}
+      string_append (decl, "'");
+      mangled = endptr;
+    }
+  else if (type == 'b')
+    {
+      /* Parse boolean value.  */
+      char *endptr;
+      long val = strtol (mangled, &endptr, 10);
+
+      if (endptr == NULL || val < 0)
+	return NULL;
+
+      string_append (decl, val ? "true" : "false");
+      mangled = endptr;
+    }
+  else
+    {
+      /* Parse integer value.  */
+      const char *numptr = mangled;
+      size_t num = 0;
+
+      while (ISDIGIT (*mangled))
+	{
+	  num++;
+	  mangled++;
+	}
+      string_appendn (decl, numptr, num);
+
+      /* Append suffix.  */
+      switch (type)
+	{
+	case 'h': /* ubyte */
+	case 't': /* ushort */
+	case 'k': /* uint */
+	  string_append (decl, "u");
+	  break;
+	case 'l': /* long */
+	  string_append (decl, "L");
+	  break;
+	case 'm': /* ulong */
+	  string_append (decl, "uL");
+	  break;
+	}
+    }
+
+  return mangled;
+}
+
+/* Extract the floating-point value from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_parse_real (string *decl, const char *mangled)
+{
+  char buffer[64];
+  int len = 0;
+  long double value;
+  char *endptr;
+
+  /* Handle NAN and +-INF.  */
+  if (strncmp (mangled, "NAN", 3) == 0)
+    {
+      string_append (decl, "NaN");
+      mangled += 3;
+      return mangled;
+    }
+  else if (strncmp (mangled, "INF", 3) == 0)
+    {
+      string_append (decl, "Inf");
+      mangled += 3;
+      return mangled;
+    }
+  else if (strncmp (mangled, "NINF", 4) == 0)
+    {
+      string_append (decl, "-Inf");
+      mangled += 4;
+      return mangled;
+    }
+
+  /* Hexadecimal prefix and leading bit.  */
+  if (*mangled == 'N')
+    {
+      buffer[len++] = '-';
+      mangled++;
+    }
+
+  if (!ISXDIGIT (*mangled))
+    return NULL;
+
+  buffer[len++] = '0';
+  buffer[len++] = 'x';
+  buffer[len++] = *mangled;
+  buffer[len++] = '.';
+  mangled++;
+
+  /* Significand.  */
+  while (ISXDIGIT (*mangled))
+    {
+      buffer[len++] = *mangled;
+      mangled++;
+    }
+
+  /* Exponent.  */
+  if (*mangled != 'P')
+    return NULL;
+
+  buffer[len++] = 'p';
+  mangled++;
+
+  if (*mangled == 'N')
+    {
+      buffer[len++] = '-';
+      mangled++;
+    }
+
+  while (ISDIGIT (*mangled))
+    {
+      buffer[len++] = *mangled;
+      mangled++;
+    }
+
+  /* Convert buffer from hexadecimal to floating-point.  */
+  buffer[len] = '\0';
+  value = strtold (buffer, &endptr);
+
+  if (endptr == NULL || endptr != (buffer + len))
+    return NULL;
+
+  len = snprintf (buffer, sizeof(buffer), "%#Lg", value);
+  string_appendn (decl, buffer, len);
+  return mangled;
+}
+
+/* Convert VAL from an ascii hexdigit to value.  */
+static char
+ascii2hex (char val)
+{
+  if (val >= 'a' && val <= 'f')
+    return (val - 'a' + 10);
+
+  if (val >= 'A' && val <= 'F')
+    return (val - 'A' + 10);
+
+  if (val >= '0' && val <= '9')
+    return (val - '0');
+
+  return 0;
+}
+
+/* Extract the string value from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_parse_string (string *decl, const char *mangled)
+{
+  char type = *mangled;
+  char *endptr;
+  long len;
+
+  mangled++;
+  len = strtol (mangled, &endptr, 10);
+
+  if (endptr == NULL || len < 0)
+    return NULL;
+
+  mangled = endptr;
+  if (*mangled != '_')
+    return NULL;
+
+  mangled++;
+  string_append (decl, "\"");
+  while (len--)
+    {
+      if (ISXDIGIT (mangled[0]) && ISXDIGIT (mangled[1]))
+	{
+	  char a = ascii2hex (mangled[0]);
+	  char b = ascii2hex (mangled[1]);
+	  char val = (a << 4) | b;
+	  string_appendn (decl, &val, 1);
+	}
+      else
+	return NULL;
+
+      mangled += 2;
+    }
+  string_append (decl, "\"");
+
+  if (type != 'a')
+    string_appendn (decl, &type, 1);
+
+  return mangled;
+}
+
+/* Extract the static array value from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_parse_arrayliteral (string *decl, const char *mangled)
+{
+  char *endptr;
+  long elements = strtol (mangled, &endptr, 10);
+
+  if (endptr == NULL || elements < 0)
+    return NULL;
+
+  mangled = endptr;
+  string_append (decl, "[");
+  while (elements--)
+    {
+      mangled = dlang_value (decl, mangled, NULL, '\0');
+      if (elements != 0)
+	string_append (decl, ", ");
+    }
+
+  string_append (decl, "]");
+  return mangled;
+}
+
+/* Extract the associative array value from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_parse_assocarray (string *decl, const char *mangled)
+{
+  char *endptr;
+  long elements = strtol (mangled, &endptr, 10);
+
+  if (endptr == NULL || elements < 0)
+    return NULL;
+
+  mangled = endptr;
+  string_append (decl, "[");
+  while (elements--)
+    {
+      mangled = dlang_value (decl, mangled, NULL, '\0');
+      string_append (decl, ":");
+      mangled = dlang_value (decl, mangled, NULL, '\0');
+
+      if (elements != 0)
+	string_append (decl, ", ");
+    }
+
+  string_append (decl, "]");
+  return mangled;
+}
+
+/* Extract the struct literal value for NAME from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_parse_structlit (string *decl, const char *mangled, const char *name)
+{
+  char *endptr;
+  long args = strtol (mangled, &endptr, 10);
+
+  if (endptr == NULL || args < 0)
+    return NULL;
+
+  mangled = endptr;
+  if (name != NULL)
+    string_append (decl, name);
+
+  string_append (decl, "(");
+  while (args--)
+    {
+      mangled = dlang_value (decl, mangled, NULL, '\0');
+      if (args != 0)
+	string_append (decl, ", ");
+    }
+
+  string_append (decl, ")");
+  return mangled;
+}
+
+/* Extract the value from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_value (string *decl, const char *mangled, const char *name, char type)
+{
+  if (mangled == NULL || *mangled == '\0')
+    return mangled;
+
+  switch (*mangled)
+    {
+      /* Null value.  */
+    case 'n':
+      mangled++;
+      string_append (decl, "null");
+      break;
+
+      /* Integral values.  */
+    case 'N':
+      mangled++;
+      string_append (decl, "-");
+      mangled = dlang_parse_integer (decl, mangled, type);
+      break;
+
+    case 'i':
+      mangled++;
+      if (*mangled < '0' || *mangled > '9')
+	return NULL;
+      /* Fall through */
+    case '0': case '1': case '2': case '3': case '4':
+    case '5': case '6': case '7': case '8': case '9':
+      mangled = dlang_parse_integer (decl, mangled, type);
+      break;
+
+      /* Real value.  */
+    case 'e':
+      mangled++;
+      mangled = dlang_parse_real (decl, mangled);
+      break;
+
+      /* Complex value.  */
+    case 'c':
+      mangled++;
+      mangled = dlang_parse_real (decl, mangled);
+      string_append (decl, "+");
+      if (mangled == NULL || *mangled != 'c')
+	return NULL;
+      mangled++;
+      mangled = dlang_parse_real (decl, mangled);
+      string_append (decl, "i");
+      break;
+
+      /* String values.  */
+    case 'a': /* UTF8 */
+    case 'w': /* UTF16 */
+    case 'd': /* UTF32 */
+      mangled = dlang_parse_string (decl, mangled);
+      break;
+
+      /* Array values.  */
+    case 'A':
+      mangled++;
+      if (type == 'H')
+	mangled = dlang_parse_assocarray (decl, mangled);
+      else
+	mangled = dlang_parse_arrayliteral (decl, mangled);
+      break;
+
+      /* Struct values.  */
+    case 'S':
+      mangled++;
+      mangled = dlang_parse_structlit (decl, mangled, name);
+      break;
+
+    default:
+      return NULL;
+    }
+
+  return mangled;
+}
+
+static int
+dlang_call_convention_p (const char *mangled)
+{
+  size_t i;
+
+  switch (*mangled)
+    {
+    case 'F': case 'U': case 'V':
+    case 'W': case 'R':
+      return 1;
+
+    case 'M': /* Prefix for functions needing 'this' */
+      i = 1;
+      if (mangled[i] == 'x')
+	i++;
+
+      switch (mangled[i])
+	{
+	case 'F': case 'U': case 'V':
+	case 'W': case 'R':
+	  return 1;
+	}
+
+    default:
+      return 0;
+    }
+}
+
+/* Extract and demangle the symbol in MANGLED and append it to DECL.
+   Returns the remaining signature on success or NULL on failure.  */
+static const char *
+dlang_parse_symbol (string *decl, const char *mangled)
+{
+  size_t n = 0;
+  do
+    {
+      if (n++)
+	string_append (decl, ".");
+
+      mangled = dlang_identifier (decl, mangled);
+
+      if (mangled && dlang_call_convention_p (mangled))
+	{
+	  int saved;
+
+	  /* Skip over 'this' parameter.  */
+	  if (*mangled == 'M')
+	    mangled += (mangled[1] == 'x') ? 2 : 1;
+
+	  /* Skip over calling convention and attributes in qualified name.  */
+	  saved = string_length (decl);
+	  mangled = dlang_call_convention (decl, mangled);
+	  mangled = dlang_attributes (decl, mangled);
+	  string_setlength (decl, saved);
+
+	  string_append (decl, "(");
+	  mangled = dlang_function_args (decl, mangled);
+	  string_append (decl, ")");
+
+	  /* Demangle the function return type as a kind of sanity test.  */
+	  if (mangled && !ISDIGIT (*mangled))
+	    {
+	      saved = string_length (decl);
+	      mangled = dlang_type (decl, mangled);
+	      string_setlength (decl, saved);
+	    }
+	}
+    }
+  while (mangled && ISDIGIT (*mangled));
+
+  return mangled;
+}
+
+/* Demangle the tuple from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_parse_tuple (string *decl, const char *mangled)
+{
+  char *endptr;
+  long elements = strtol (mangled, &endptr, 10);
+
+  if (endptr == NULL || elements < 0)
+    return NULL;
+
+  mangled = endptr;
+  string_append (decl, "Tuple!(");
+
+  while (elements--)
+    {
+      mangled = dlang_type (decl, mangled);
+      if (elements != 0)
+	string_append (decl, ", ");
+    }
+
+  string_append (decl, ")");
+  return mangled;
+}
+
+/* Demangle the argument list from MANGLED and append it to DECL.
+   Return the remaining string on success or NULL on failure.  */
+static const char *
+dlang_template_args (string *decl, const char *mangled)
+{
+  size_t n = 0;
+
+  while (mangled && *mangled != '\0')
+    {
+      switch (*mangled)
+	{
+	case 'Z': /* End of parameter list.  */
+	  mangled++;
+	  return mangled;
+	}
+
+      if (n++)
+	string_append (decl, ", ");
+
+      switch (*mangled)
+	{
+	case 'S': /* Symbol parameter.  */
+	  mangled++;
+	  mangled = dlang_parse_symbol (decl, mangled);
+	  break;
+	case 'T': /* Type parameter.  */
+	  mangled++;
+	  mangled = dlang_type (decl, mangled);
+	  break;
+	case 'V': /* Value parameter.  */
+	{
+	  string name;
+	  char type;
+
+	  /* Peek at the type.  */
+	  mangled++;
+	  type = *mangled;
+
+	  /* In the few instances where the type is actually desired in
+	     the output, it should precede the value from dlang_value.  */
+	  string_init (&name);
+	  mangled = dlang_type (&name, mangled);
+	  string_need (&name, 1);
+	  *(name.p) = '\0';
+
+	  mangled = dlang_value (decl, mangled, name.b, type);
+	  string_delete (&name);
+	  break;
+	}
+
+	default:
+	  return NULL;
+	}
+    }
+
+  return mangled;
+}
+
+/* Extract and demangle the template symbol in MANGLED, expected to
+   be made up of LEN characters, and append it to DECL.
+   Returns the remaining signature on success or NULL on failure.  */
+static const char *
+dlang_parse_template (string *decl, const char *mangled, long len)
+{
+  const char *start = mangled;
+
+  /* Template instance names have the types and values of its parameters
+     encoded into it.
+
+	TemplateInstanceName:
+	    Number __T LName TemplateArgs Z
+		   ^
+     The start pointer should be at the above location, and LEN should be
+     the value of the decoded number.
+   */
+  if (strncmp (mangled, "__T", 3) != 0)
+    return NULL;
+
+  mangled += 3;
+
+  /* Template identifier.  */
+  mangled = dlang_identifier (decl, mangled);
+
+  /* Template arguments.  */
+  string_append (decl, "!(");
+  mangled = dlang_template_args (decl, mangled);
+  string_append (decl, ")");
+
+  /* Check for template name length mismatch.  */
+  if (mangled && (mangled - start) != len)
+    return NULL;
+
+  return mangled;
+}
+
+/* Extract and demangle the symbol in MANGLED.  Returns the demangled
+   signature on success or NULL on failure.  */
+
+char *
+dlang_demangle (const char *mangled, int option ATTRIBUTE_UNUSED)
+{
+  string decl;
+  char *demangled = NULL;
+
+  if (mangled == NULL || *mangled == '\0')
+    return NULL;
+
+  if (strncmp (mangled, "_D", 2) != 0)
+    return NULL;
+
+  string_init (&decl);
+
+  if (strcmp (mangled, "_Dmain") == 0)
+    {
+      string_append (&decl, "D main");
+    }
+  else
+    {
+      mangled += 2;
+
+      if (dlang_parse_symbol (&decl, mangled) == NULL)
+	string_delete (&decl);
+    }
+
+  if (string_length (&decl) > 0)
+    {
+      string_need (&decl, 1);
+      *(decl.p) = '\0';
+      demangled = decl.b;
+    }
+
+  return demangled;
+}
+