binutils-gdb/gdb/jv-lang.c

/* Java language support routines for GDB, the GNU debugger.

   Copyright (C) 1997, 1998, 1999, 2000, 2003, 2004, 2005, 2007
   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 "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "gdbtypes.h"
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdb_string.h"
#include "value.h"
#include "c-lang.h"
#include "jv-lang.h"
#include "gdbcore.h"
#include "block.h"
#include "demangle.h"
#include "dictionary.h"
#include <ctype.h>
#include "gdb_assert.h"

struct type *java_int_type;
struct type *java_byte_type;
struct type *java_short_type;
struct type *java_long_type;
struct type *java_boolean_type;
struct type *java_char_type;
struct type *java_float_type;
struct type *java_double_type;
struct type *java_void_type;

/* Local functions */

extern void _initialize_java_language (void);

static int java_demangled_signature_length (char *);
static void java_demangled_signature_copy (char *, char *);

static struct symtab *get_java_class_symtab (void);
static char *get_java_utf8_name (struct obstack *obstack, struct value *name);
static int java_class_is_primitive (struct value *clas);
static struct value *java_value_string (char *ptr, int len);

static void java_emit_char (int c, struct ui_file * stream, int quoter);

static char *java_class_name_from_physname (const char *physname);

/* This objfile contains symtabs that have been dynamically created
   to record dynamically loaded Java classes and dynamically
   compiled java methods. */

static struct objfile *dynamics_objfile = NULL;

static struct type *java_link_class_type (struct type *, struct value *);

/* FIXME: carlton/2003-02-04: This is the main or only caller of
   allocate_objfile with first argument NULL; as a result, this code
   breaks every so often.  Somebody should write a test case that
   exercises GDB in various ways (e.g. something involving loading a
   dynamic library) after this code has been called.  */

static struct objfile *
get_dynamics_objfile (void)
{
  if (dynamics_objfile == NULL)
    {
      dynamics_objfile = allocate_objfile (NULL, 0);
    }
  return dynamics_objfile;
}

#if 1
/* symtab contains classes read from the inferior. */

static struct symtab *class_symtab = NULL;

static void free_class_block (struct symtab *symtab);

static struct symtab *
get_java_class_symtab (void)
{
  if (class_symtab == NULL)
    {
      struct objfile *objfile = get_dynamics_objfile ();
      struct blockvector *bv;
      struct block *bl;
      class_symtab = allocate_symtab ("<java-classes>", objfile);
      class_symtab->language = language_java;
      bv = (struct blockvector *)
	obstack_alloc (&objfile->objfile_obstack,
		       sizeof (struct blockvector) + sizeof (struct block *));
      BLOCKVECTOR_NBLOCKS (bv) = 1;
      BLOCKVECTOR (class_symtab) = bv;

      /* Allocate dummy STATIC_BLOCK. */
      bl = allocate_block (&objfile->objfile_obstack);
      BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack,
					    NULL);
      BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl;

      /* Allocate GLOBAL_BLOCK.  */
      bl = allocate_block (&objfile->objfile_obstack);
      BLOCK_DICT (bl) = dict_create_hashed_expandable ();
      BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl;
      class_symtab->free_func = free_class_block;
    }
  return class_symtab;
}

static void
add_class_symtab_symbol (struct symbol *sym)
{
  struct symtab *symtab = get_java_class_symtab ();
  struct blockvector *bv = BLOCKVECTOR (symtab);
  dict_add_symbol (BLOCK_DICT (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK)), sym);
}

static struct symbol *add_class_symbol (struct type *type, CORE_ADDR addr);

static struct symbol *
add_class_symbol (struct type *type, CORE_ADDR addr)
{
  struct symbol *sym;
  sym = (struct symbol *)
    obstack_alloc (&dynamics_objfile->objfile_obstack, sizeof (struct symbol));
  memset (sym, 0, sizeof (struct symbol));
  SYMBOL_LANGUAGE (sym) = language_java;
  DEPRECATED_SYMBOL_NAME (sym) = TYPE_TAG_NAME (type);
  SYMBOL_CLASS (sym) = LOC_TYPEDEF;
  /*  SYMBOL_VALUE (sym) = valu; */
  SYMBOL_TYPE (sym) = type;
  SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
  SYMBOL_VALUE_ADDRESS (sym) = addr;
  return sym;
}

/* Free the dynamic symbols block.  */
static void
free_class_block (struct symtab *symtab)
{
  struct blockvector *bv = BLOCKVECTOR (symtab);
  struct block *bl = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);

  dict_free (BLOCK_DICT (bl));
}
#endif

struct type *
java_lookup_class (char *name)
{
  struct symbol *sym;
  sym = lookup_symbol (name, expression_context_block, STRUCT_DOMAIN,
		       (int *) 0, (struct symtab **) NULL);
  if (sym != NULL)
    return SYMBOL_TYPE (sym);
#if 0
  CORE_ADDR addr;
  if (called from parser)
    {
      call lookup_class (or similar) in inferior;
      if not
      found:
	return NULL;
      addr = found in inferior;
    }
  else
    addr = 0;
  struct type *type;
  type = alloc_type (objfile);
  TYPE_CODE (type) = TYPE_CODE_STRUCT;
  INIT_CPLUS_SPECIFIC (type);
  TYPE_TAG_NAME (type) = obsavestring (name, strlen (name), &objfile->objfile_obstack);
  TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
  TYPE ? = addr;
  return type;
#else
  /* FIXME - should search inferior's symbol table. */
  return NULL;
#endif
}

/* Return a nul-terminated string (allocated on OBSTACK) for
   a name given by NAME (which has type Utf8Const*). */

char *
get_java_utf8_name (struct obstack *obstack, struct value *name)
{
  char *chrs;
  struct value *temp = name;
  int name_length;
  CORE_ADDR data_addr;
  temp = value_struct_elt (&temp, NULL, "length", NULL, "structure");
  name_length = (int) value_as_long (temp);
  data_addr = VALUE_ADDRESS (temp) + value_offset (temp)
    + TYPE_LENGTH (value_type (temp));
  chrs = obstack_alloc (obstack, name_length + 1);
  chrs[name_length] = '\0';
  read_memory (data_addr, (gdb_byte *) chrs, name_length);
  return chrs;
}

struct value *
java_class_from_object (struct value *obj_val)
{
  /* This is all rather inefficient, since the offsets of vtable and
     class are fixed.  FIXME */
  struct value *vtable_val;

  if (TYPE_CODE (value_type (obj_val)) == TYPE_CODE_PTR
      && TYPE_LENGTH (TYPE_TARGET_TYPE (value_type (obj_val))) == 0)
    obj_val = value_at (get_java_object_type (),
			value_as_address (obj_val));

  vtable_val = value_struct_elt (&obj_val, NULL, "vtable", NULL, "structure");
  return value_struct_elt (&vtable_val, NULL, "class", NULL, "structure");
}

/* Check if CLASS_IS_PRIMITIVE(value of clas): */
static int
java_class_is_primitive (struct value *clas)
{
  struct value *vtable = value_struct_elt (&clas, NULL, "vtable", NULL, "struct");
  CORE_ADDR i = value_as_address (vtable);
  return (int) (i & 0x7fffffff) == (int) 0x7fffffff;
}

/* Read a GCJ Class object, and generated a gdb (TYPE_CODE_STRUCT) type. */

struct type *
type_from_class (struct value *clas)
{
  struct type *type;
  char *name;
  struct value *temp;
  struct objfile *objfile;
  struct value *utf8_name;
  char *nptr;
  CORE_ADDR addr;
  struct block *bl;
  struct dict_iterator iter;
  int is_array = 0;

  type = check_typedef (value_type (clas));
  if (TYPE_CODE (type) == TYPE_CODE_PTR)
    {
      if (value_logical_not (clas))
	return NULL;
      clas = value_ind (clas);
    }
  addr = VALUE_ADDRESS (clas) + value_offset (clas);

#if 0
  get_java_class_symtab ();
  bl = BLOCKVECTOR_BLOCK (BLOCKVECTOR (class_symtab), GLOBAL_BLOCK);
  ALL_BLOCK_SYMBOLS (block, iter, sym)
    {
      if (SYMBOL_VALUE_ADDRESS (sym) == addr)
	return SYMBOL_TYPE (sym);
    }
#endif

  objfile = get_dynamics_objfile ();
  if (java_class_is_primitive (clas))
    {
      struct value *sig;
      temp = clas;
      sig = value_struct_elt (&temp, NULL, "method_count", NULL, "structure");
      return java_primitive_type (value_as_long (sig));
    }

  /* Get Class name. */
  /* if clasloader non-null, prepend loader address. FIXME */
  temp = clas;
  utf8_name = value_struct_elt (&temp, NULL, "name", NULL, "structure");
  name = get_java_utf8_name (&objfile->objfile_obstack, utf8_name);
  for (nptr = name; *nptr != 0; nptr++)
    {
      if (*nptr == '/')
	*nptr = '.';
    }

  type = java_lookup_class (name);
  if (type != NULL)
    return type;

  type = alloc_type (objfile);
  TYPE_CODE (type) = TYPE_CODE_STRUCT;
  INIT_CPLUS_SPECIFIC (type);

  if (name[0] == '[')
    {
      char *signature = name;
      int namelen = java_demangled_signature_length (signature);
      if (namelen > strlen (name))
	name = obstack_alloc (&objfile->objfile_obstack, namelen + 1);
      java_demangled_signature_copy (name, signature);
      name[namelen] = '\0';
      is_array = 1;
      temp = clas;
      /* Set array element type. */
      temp = value_struct_elt (&temp, NULL, "methods", NULL, "structure");
      deprecated_set_value_type (temp, lookup_pointer_type (value_type (clas)));
      TYPE_TARGET_TYPE (type) = type_from_class (temp);
    }

  ALLOCATE_CPLUS_STRUCT_TYPE (type);
  TYPE_TAG_NAME (type) = name;

  add_class_symtab_symbol (add_class_symbol (type, addr));
  return java_link_class_type (type, clas);
}

/* Fill in class TYPE with data from the CLAS value. */

struct type *
java_link_class_type (struct type *type, struct value *clas)
{
  struct value *temp;
  char *unqualified_name;
  char *name = TYPE_TAG_NAME (type);
  int ninterfaces, nfields, nmethods;
  int type_is_object = 0;
  struct fn_field *fn_fields;
  struct fn_fieldlist *fn_fieldlists;
  struct value *fields;
  struct value *methods;
  struct value *method = NULL;
  struct value *field = NULL;
  int i, j;
  struct objfile *objfile = get_dynamics_objfile ();
  struct type *tsuper;

  gdb_assert (name != NULL);
  unqualified_name = strrchr (name, '.');
  if (unqualified_name == NULL)
    unqualified_name = name;

  temp = clas;
  temp = value_struct_elt (&temp, NULL, "superclass", NULL, "structure");
  if (strcmp (name, "java.lang.Object") == 0)
    {
      tsuper = get_java_object_type ();
      if (tsuper && TYPE_CODE (tsuper) == TYPE_CODE_PTR)
	tsuper = TYPE_TARGET_TYPE (tsuper);
      type_is_object = 1;
    }
  else
    tsuper = type_from_class (temp);

#if 1
  ninterfaces = 0;
#else
  temp = clas;
  ninterfaces = value_as_long (value_struct_elt (&temp, NULL, "interface_len", NULL, "structure"));
#endif
  TYPE_N_BASECLASSES (type) = (tsuper == NULL ? 0 : 1) + ninterfaces;
  temp = clas;
  nfields = value_as_long (value_struct_elt (&temp, NULL, "field_count", NULL, "structure"));
  nfields += TYPE_N_BASECLASSES (type);
  nfields++;			/* Add one for dummy "class" field. */
  TYPE_NFIELDS (type) = nfields;
  TYPE_FIELDS (type) = (struct field *)
    TYPE_ALLOC (type, sizeof (struct field) * nfields);

  memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);

  TYPE_FIELD_PRIVATE_BITS (type) =
    (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
  B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);

  TYPE_FIELD_PROTECTED_BITS (type) =
    (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
  B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);

  TYPE_FIELD_IGNORE_BITS (type) =
    (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
  B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);

  TYPE_FIELD_VIRTUAL_BITS (type) = (B_TYPE *)
    TYPE_ALLOC (type, B_BYTES (TYPE_N_BASECLASSES (type)));
  B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), TYPE_N_BASECLASSES (type));

  if (tsuper != NULL)
    {
      TYPE_BASECLASS (type, 0) = tsuper;
      if (type_is_object)
	SET_TYPE_FIELD_PRIVATE (type, 0);
    }

  i = strlen (name);
  if (i > 2 && name[i - 1] == ']' && tsuper != NULL)
    {
      /* FIXME */
      TYPE_LENGTH (type) = TYPE_LENGTH (tsuper) + 4;	/* size with "length" */
    }
  else
    {
      temp = clas;
      temp = value_struct_elt (&temp, NULL, "size_in_bytes", NULL, "structure");
      TYPE_LENGTH (type) = value_as_long (temp);
    }

  fields = NULL;
  nfields--;			/* First set up dummy "class" field. */
  SET_FIELD_PHYSADDR (TYPE_FIELD (type, nfields),
		      VALUE_ADDRESS (clas) + value_offset (clas));
  TYPE_FIELD_NAME (type, nfields) = "class";
  TYPE_FIELD_TYPE (type, nfields) = value_type (clas);
  SET_TYPE_FIELD_PRIVATE (type, nfields);

  for (i = TYPE_N_BASECLASSES (type); i < nfields; i++)
    {
      int accflags;
      int boffset;
      if (fields == NULL)
	{
	  temp = clas;
	  fields = value_struct_elt (&temp, NULL, "fields", NULL, "structure");
	  field = value_ind (fields);
	}
      else
	{			/* Re-use field value for next field. */
	  VALUE_ADDRESS (field) += TYPE_LENGTH (value_type (field));
	  set_value_lazy (field, 1);
	}
      temp = field;
      temp = value_struct_elt (&temp, NULL, "name", NULL, "structure");
      TYPE_FIELD_NAME (type, i) =
	get_java_utf8_name (&objfile->objfile_obstack, temp);
      temp = field;
      accflags = value_as_long (value_struct_elt (&temp, NULL, "accflags",
						  NULL, "structure"));
      temp = field;
      temp = value_struct_elt (&temp, NULL, "info", NULL, "structure");
      boffset = value_as_long (value_struct_elt (&temp, NULL, "boffset",
						 NULL, "structure"));
      if (accflags & 0x0001)	/* public access */
	{
	  /* ??? */
	}
      if (accflags & 0x0002)	/* private access */
	{
	  SET_TYPE_FIELD_PRIVATE (type, i);
	}
      if (accflags & 0x0004)	/* protected access */
	{
	  SET_TYPE_FIELD_PROTECTED (type, i);
	}
      if (accflags & 0x0008)	/* ACC_STATIC */
	SET_FIELD_PHYSADDR (TYPE_FIELD (type, i), boffset);
      else
	TYPE_FIELD_BITPOS (type, i) = 8 * boffset;
      if (accflags & 0x8000)	/* FIELD_UNRESOLVED_FLAG */
	{
	  TYPE_FIELD_TYPE (type, i) = get_java_object_type ();	/* FIXME */
	}
      else
	{
	  struct type *ftype;
	  temp = field;
	  temp = value_struct_elt (&temp, NULL, "type", NULL, "structure");
	  ftype = type_from_class (temp);
	  if (TYPE_CODE (ftype) == TYPE_CODE_STRUCT)
	    ftype = lookup_pointer_type (ftype);
	  TYPE_FIELD_TYPE (type, i) = ftype;
	}
    }

  temp = clas;
  nmethods = value_as_long (value_struct_elt (&temp, NULL, "method_count",
					      NULL, "structure"));
  TYPE_NFN_FIELDS_TOTAL (type) = nmethods;
  j = nmethods * sizeof (struct fn_field);
  fn_fields = (struct fn_field *)
    obstack_alloc (&dynamics_objfile->objfile_obstack, j);
  memset (fn_fields, 0, j);
  fn_fieldlists = (struct fn_fieldlist *)
    alloca (nmethods * sizeof (struct fn_fieldlist));

  methods = NULL;
  for (i = 0; i < nmethods; i++)
    {
      char *mname;
      int k;
      if (methods == NULL)
	{
	  temp = clas;
	  methods = value_struct_elt (&temp, NULL, "methods", NULL, "structure");
	  method = value_ind (methods);
	}
      else
	{			/* Re-use method value for next method. */
	  VALUE_ADDRESS (method) += TYPE_LENGTH (value_type (method));
	  set_value_lazy (method, 1);
	}

      /* Get method name. */
      temp = method;
      temp = value_struct_elt (&temp, NULL, "name", NULL, "structure");
      mname = get_java_utf8_name (&objfile->objfile_obstack, temp);
      if (strcmp (mname, "<init>") == 0)
	mname = unqualified_name;

      /* Check for an existing method with the same name.
       * This makes building the fn_fieldslists an O(nmethods**2)
       * operation.  That could be using hashing, but I doubt it
       * is worth it.  Note that we do maintain the order of methods
       * in the inferior's Method table (as long as that is grouped
       * by method name), which I think is desirable.  --PB */
      for (k = 0, j = TYPE_NFN_FIELDS (type);;)
	{
	  if (--j < 0)
	    {			/* No match - new method name. */
	      j = TYPE_NFN_FIELDS (type)++;
	      fn_fieldlists[j].name = mname;
	      fn_fieldlists[j].length = 1;
	      fn_fieldlists[j].fn_fields = &fn_fields[i];
	      k = i;
	      break;
	    }
	  if (strcmp (mname, fn_fieldlists[j].name) == 0)
	    {			/* Found an existing method with the same name. */
	      int l;
	      if (mname != unqualified_name)
		obstack_free (&objfile->objfile_obstack, mname);
	      mname = fn_fieldlists[j].name;
	      fn_fieldlists[j].length++;
	      k = i - k;	/* Index of new slot. */
	      /* Shift intervening fn_fields (between k and i) down. */
	      for (l = i; l > k; l--)
		fn_fields[l] = fn_fields[l - 1];
	      for (l = TYPE_NFN_FIELDS (type); --l > j;)
		fn_fieldlists[l].fn_fields++;
	      break;
	    }
	  k += fn_fieldlists[j].length;
	}
      fn_fields[k].physname = "";
      fn_fields[k].is_stub = 1;
      fn_fields[k].type = make_function_type (java_void_type, NULL);	/* FIXME */
      TYPE_CODE (fn_fields[k].type) = TYPE_CODE_METHOD;
    }

  j = TYPE_NFN_FIELDS (type) * sizeof (struct fn_fieldlist);
  TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
    obstack_alloc (&dynamics_objfile->objfile_obstack, j);
  memcpy (TYPE_FN_FIELDLISTS (type), fn_fieldlists, j);

  return type;
}

static struct type *java_object_type;

struct type *
get_java_object_type (void)
{
  if (java_object_type == NULL)
    {
      struct symbol *sym;
      sym = lookup_symbol ("java.lang.Object", NULL, STRUCT_DOMAIN,
			   (int *) 0, (struct symtab **) NULL);
      if (sym == NULL)
	error (_("cannot find java.lang.Object"));
      java_object_type = SYMBOL_TYPE (sym);
    }
  return java_object_type;
}

int
get_java_object_header_size (void)
{
  struct type *objtype = get_java_object_type ();
  if (objtype == NULL)
    return (2 * gdbarch_ptr_bit (current_gdbarch) / TARGET_CHAR_BIT);
  else
    return TYPE_LENGTH (objtype);
}

int
is_object_type (struct type *type)
{
  CHECK_TYPEDEF (type);
  if (TYPE_CODE (type) == TYPE_CODE_PTR)
    {
      struct type *ttype = check_typedef (TYPE_TARGET_TYPE (type));
      char *name;
      if (TYPE_CODE (ttype) != TYPE_CODE_STRUCT)
	return 0;
      while (TYPE_N_BASECLASSES (ttype) > 0)
	ttype = TYPE_BASECLASS (ttype, 0);
      name = TYPE_TAG_NAME (ttype);
      if (name != NULL && strcmp (name, "java.lang.Object") == 0)
	return 1;
      name = TYPE_NFIELDS (ttype) > 0 ? TYPE_FIELD_NAME (ttype, 0) : (char *) 0;
      if (name != NULL && strcmp (name, "vtable") == 0)
	{
	  if (java_object_type == NULL)
	    java_object_type = type;
	  return 1;
	}
    }
  return 0;
}

struct type *
java_primitive_type (int signature)
{
  switch (signature)
    {
    case 'B':
      return java_byte_type;
    case 'S':
      return java_short_type;
    case 'I':
      return java_int_type;
    case 'J':
      return java_long_type;
    case 'Z':
      return java_boolean_type;
    case 'C':
      return java_char_type;
    case 'F':
      return java_float_type;
    case 'D':
      return java_double_type;
    case 'V':
      return java_void_type;
    }
  error (_("unknown signature '%c' for primitive type"), (char) signature);
}

/* If name[0 .. namelen-1] is the name of a primitive Java type,
   return that type.  Otherwise, return NULL. */

struct type *
java_primitive_type_from_name (char *name, int namelen)
{
  switch (name[0])
    {
    case 'b':
      if (namelen == 4 && memcmp (name, "byte", 4) == 0)
	return java_byte_type;
      if (namelen == 7 && memcmp (name, "boolean", 7) == 0)
	return java_boolean_type;
      break;
    case 'c':
      if (namelen == 4 && memcmp (name, "char", 4) == 0)
	return java_char_type;
    case 'd':
      if (namelen == 6 && memcmp (name, "double", 6) == 0)
	return java_double_type;
      break;
    case 'f':
      if (namelen == 5 && memcmp (name, "float", 5) == 0)
	return java_float_type;
      break;
    case 'i':
      if (namelen == 3 && memcmp (name, "int", 3) == 0)
	return java_int_type;
      break;
    case 'l':
      if (namelen == 4 && memcmp (name, "long", 4) == 0)
	return java_long_type;
      break;
    case 's':
      if (namelen == 5 && memcmp (name, "short", 5) == 0)
	return java_short_type;
      break;
    case 'v':
      if (namelen == 4 && memcmp (name, "void", 4) == 0)
	return java_void_type;
      break;
    }
  return NULL;
}

/* Return the length (in bytes) of demangled name of the Java type
   signature string SIGNATURE. */

static int
java_demangled_signature_length (char *signature)
{
  int array = 0;
  for (; *signature == '['; signature++)
    array += 2;			/* Two chars for "[]". */
  switch (signature[0])
    {
    case 'L':
      /* Subtract 2 for 'L' and ';'. */
      return strlen (signature) - 2 + array;
    default:
      return strlen (TYPE_NAME (java_primitive_type (signature[0]))) + array;
    }
}

/* Demangle the Java type signature SIGNATURE, leaving the result in RESULT. */

static void
java_demangled_signature_copy (char *result, char *signature)
{
  int array = 0;
  char *ptr;
  int i;
  while (*signature == '[')
    {
      array++;
      signature++;
    }
  switch (signature[0])
    {
    case 'L':
      /* Subtract 2 for 'L' and ';', but add 1 for final nul. */
      signature++;
      ptr = result;
      for (; *signature != ';' && *signature != '\0'; signature++)
	{
	  if (*signature == '/')
	    *ptr++ = '.';
	  else
	    *ptr++ = *signature;
	}
      break;
    default:
      ptr = TYPE_NAME (java_primitive_type (signature[0]));
      i = strlen (ptr);
      strcpy (result, ptr);
      ptr = result + i;
      break;
    }
  while (--array >= 0)
    {
      *ptr++ = '[';
      *ptr++ = ']';
    }
}

/* Return the demangled name of the Java type signature string SIGNATURE,
   as a freshly allocated copy. */

char *
java_demangle_type_signature (char *signature)
{
  int length = java_demangled_signature_length (signature);
  char *result = xmalloc (length + 1);
  java_demangled_signature_copy (result, signature);
  result[length] = '\0';
  return result;
}

/* Return the type of TYPE followed by DIMS pairs of [ ].
   If DIMS == 0, TYPE is returned. */

struct type *
java_array_type (struct type *type, int dims)
{
  struct type *range_type;

  while (dims-- > 0)
    {
      range_type = create_range_type (NULL, builtin_type_int, 0, 0);
      /* FIXME  This is bogus!  Java arrays are not gdb arrays! */
      type = create_array_type (NULL, type, range_type);
    }

  return type;
}

/* Create a Java string in the inferior from a (Utf8) literal. */

static struct value *
java_value_string (char *ptr, int len)
{
  error (_("not implemented - java_value_string"));	/* FIXME */
}

/* Print the character C on STREAM as part of the contents of a literal
   string whose delimiter is QUOTER.  Note that that format for printing
   characters and strings is language specific. */

static void
java_emit_char (int c, struct ui_file *stream, int quoter)
{
  switch (c)
    {
    case '\\':
    case '\'':
      fprintf_filtered (stream, "\\%c", c);
      break;
    case '\b':
      fputs_filtered ("\\b", stream);
      break;
    case '\t':
      fputs_filtered ("\\t", stream);
      break;
    case '\n':
      fputs_filtered ("\\n", stream);
      break;
    case '\f':
      fputs_filtered ("\\f", stream);
      break;
    case '\r':
      fputs_filtered ("\\r", stream);
      break;
    default:
      if (isprint (c))
	fputc_filtered (c, stream);
      else
	fprintf_filtered (stream, "\\u%.4x", (unsigned int) c);
      break;
    }
}

static struct value *
evaluate_subexp_java (struct type *expect_type, struct expression *exp,
		      int *pos, enum noside noside)
{
  int pc = *pos;
  int i;
  char *name;
  enum exp_opcode op = exp->elts[*pos].opcode;
  struct value *arg1;
  struct value *arg2;
  struct type *type;
  switch (op)
    {
    case UNOP_IND:
      if (noside == EVAL_SKIP)
	goto standard;
      (*pos)++;
      arg1 = evaluate_subexp_java (NULL_TYPE, exp, pos, EVAL_NORMAL);
      if (is_object_type (value_type (arg1)))
	{
	  struct type *type;

	  type = type_from_class (java_class_from_object (arg1));
	  arg1 = value_cast (lookup_pointer_type (type), arg1);
	}
      if (noside == EVAL_SKIP)
	goto nosideret;
      return value_ind (arg1);

    case BINOP_SUBSCRIPT:
      (*pos)++;
      arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
      arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
      if (noside == EVAL_SKIP)
	goto nosideret;
      /* If the user attempts to subscript something that is not an
         array or pointer type (like a plain int variable for example),
         then report this as an error. */

      arg1 = coerce_ref (arg1);
      type = check_typedef (value_type (arg1));
      if (TYPE_CODE (type) == TYPE_CODE_PTR)
	type = check_typedef (TYPE_TARGET_TYPE (type));
      name = TYPE_NAME (type);
      if (name == NULL)
	name = TYPE_TAG_NAME (type);
      i = name == NULL ? 0 : strlen (name);
      if (TYPE_CODE (type) == TYPE_CODE_STRUCT
	  && i > 2 && name[i - 1] == ']')
	{
	  CORE_ADDR address;
	  long length, index;
	  struct type *el_type;
	  gdb_byte buf4[4];

	  struct value *clas = java_class_from_object (arg1);
	  struct value *temp = clas;
	  /* Get CLASS_ELEMENT_TYPE of the array type. */
	  temp = value_struct_elt (&temp, NULL, "methods",
				   NULL, "structure");
	  deprecated_set_value_type (temp, value_type (clas));
	  el_type = type_from_class (temp);
	  if (TYPE_CODE (el_type) == TYPE_CODE_STRUCT)
	    el_type = lookup_pointer_type (el_type);

	  if (noside == EVAL_AVOID_SIDE_EFFECTS)
	    return value_zero (el_type, VALUE_LVAL (arg1));
	  address = value_as_address (arg1);
	  address += JAVA_OBJECT_SIZE;
	  read_memory (address, buf4, 4);
	  length = (long) extract_signed_integer (buf4, 4);
	  index = (long) value_as_long (arg2);
	  if (index >= length || index < 0)
	    error (_("array index (%ld) out of bounds (length: %ld)"),
		   index, length);
	  address = (address + 4) + index * TYPE_LENGTH (el_type);
	  return value_at (el_type, address);
	}
      else if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
	{
	  if (noside == EVAL_AVOID_SIDE_EFFECTS)
	    return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
	  else
	    return value_subscript (arg1, arg2);
	}
      if (name)
	error (_("cannot subscript something of type `%s'"), name);
      else
	error (_("cannot subscript requested type"));

    case OP_STRING:
      (*pos)++;
      i = longest_to_int (exp->elts[pc + 1].longconst);
      (*pos) += 3 + BYTES_TO_EXP_ELEM (i + 1);
      if (noside == EVAL_SKIP)
	goto nosideret;
      return java_value_string (&exp->elts[pc + 2].string, i);

    case STRUCTOP_PTR:
      arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside);
      /* Convert object field (such as TYPE.class) to reference. */
      if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_STRUCT)
	arg1 = value_addr (arg1);
      return arg1;
    default:
      break;
    }
standard:
  return evaluate_subexp_standard (expect_type, exp, pos, noside);
nosideret:
  return value_from_longest (builtin_type_long, (LONGEST) 1);
}

static char *java_demangle (const char *mangled, int options)
{
  return cplus_demangle (mangled, options | DMGL_JAVA);
}

/* Find the member function name of the demangled name NAME.  NAME
   must be a method name including arguments, in order to correctly
   locate the last component.

   This function return a pointer to the first dot before the
   member function name, or NULL if the name was not of the
   expected form.  */

static const char *
java_find_last_component (const char *name)
{
  const char *p;

  /* Find argument list.  */
  p = strchr (name, '(');

  if (p == NULL)
    return NULL;

  /* Back up and find first dot prior to argument list.  */
  while (p > name && *p != '.')
    p--;

  if (p == name)
    return NULL;

  return p;
}

/* Return the name of the class containing method PHYSNAME.  */

static char *
java_class_name_from_physname (const char *physname) 
{
  char *ret = NULL;
  const char *end;
  int depth = 0;
  char *demangled_name = java_demangle (physname, DMGL_PARAMS | DMGL_ANSI);

  if (demangled_name == NULL)
    return NULL;

  end = java_find_last_component (demangled_name);
  if (end != NULL)
    {
      ret = xmalloc (end - demangled_name + 1);
      memcpy (ret, demangled_name, end - demangled_name);
      ret[end - demangled_name] = '\0';
    }

  xfree (demangled_name);
  return ret;
}

/* Table mapping opcodes into strings for printing operators
   and precedences of the operators.  */

const struct op_print java_op_print_tab[] =
{
  {",", BINOP_COMMA, PREC_COMMA, 0},
  {"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
  {"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
  {"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
  {"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
  {"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
  {"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
  {"==", BINOP_EQUAL, PREC_EQUAL, 0},
  {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0},
  {"<=", BINOP_LEQ, PREC_ORDER, 0},
  {">=", BINOP_GEQ, PREC_ORDER, 0},
  {">", BINOP_GTR, PREC_ORDER, 0},
  {"<", BINOP_LESS, PREC_ORDER, 0},
  {">>", BINOP_RSH, PREC_SHIFT, 0},
  {"<<", BINOP_LSH, PREC_SHIFT, 0},
#if 0
  {">>>", BINOP_ ? ? ?, PREC_SHIFT, 0},
#endif
  {"+", BINOP_ADD, PREC_ADD, 0},
  {"-", BINOP_SUB, PREC_ADD, 0},
  {"*", BINOP_MUL, PREC_MUL, 0},
  {"/", BINOP_DIV, PREC_MUL, 0},
  {"%", BINOP_REM, PREC_MUL, 0},
  {"-", UNOP_NEG, PREC_PREFIX, 0},
  {"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
  {"~", UNOP_COMPLEMENT, PREC_PREFIX, 0},
  {"*", UNOP_IND, PREC_PREFIX, 0},
#if 0
  {"instanceof", ? ? ?, ? ? ?, 0},
#endif
  {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0},
  {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0},
  {NULL, 0, 0, 0}
};

const struct exp_descriptor exp_descriptor_java = 
{
  print_subexp_standard,
  operator_length_standard,
  op_name_standard,
  dump_subexp_body_standard,
  evaluate_subexp_java
};

const struct language_defn java_language_defn =
{
  "java",			/* Language name */
  language_java,
  range_check_off,
  type_check_off,
  case_sensitive_on,
  array_row_major,
  &exp_descriptor_java,
  java_parse,
  java_error,
  null_post_parser,
  c_printchar,			/* Print a character constant */
  c_printstr,			/* Function to print string constant */
  java_emit_char,		/* Function to print a single character */
  java_print_type,		/* Print a type using appropriate syntax */
  java_val_print,		/* Print a value using appropriate syntax */
  java_value_print,		/* Print a top-level value */
  NULL,				/* Language specific skip_trampoline */
  value_of_this,		/* value_of_this */
  basic_lookup_symbol_nonlocal,	/* lookup_symbol_nonlocal */
  basic_lookup_transparent_type,/* lookup_transparent_type */
  java_demangle,		/* Language specific symbol demangler */
  java_class_name_from_physname,/* Language specific class name */
  java_op_print_tab,		/* expression operators for printing */
  0,				/* not c-style arrays */
  0,				/* String lower bound */
  default_word_break_characters,
  c_language_arch_info,
  default_print_array_index,
  default_pass_by_reference,
  LANG_MAGIC
};

void
_initialize_java_language (void)
{

  java_int_type = init_type (TYPE_CODE_INT, 4, 0, "int", NULL);
  java_short_type = init_type (TYPE_CODE_INT, 2, 0, "short", NULL);
  java_long_type = init_type (TYPE_CODE_INT, 8, 0, "long", NULL);
  java_byte_type = init_type (TYPE_CODE_INT, 1, 0, "byte", NULL);
  java_boolean_type = init_type (TYPE_CODE_BOOL, 1, 0, "boolean", NULL);
  java_char_type = init_type (TYPE_CODE_CHAR, 2, TYPE_FLAG_UNSIGNED, "char", NULL);
  java_float_type = init_type (TYPE_CODE_FLT, 4, 0, "float", NULL);
  java_double_type = init_type (TYPE_CODE_FLT, 8, 0, "double", NULL);
  java_void_type = init_type (TYPE_CODE_VOID, 1, 0, "void", NULL);

  add_language (&java_language_defn);
}