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

   Copyright 1997, 1998, 1999-2000 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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#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 <ctype.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 PARAMS ((void));

static int java_demangled_signature_length PARAMS ((char *));

static void java_demangled_signature_copy PARAMS ((char *, char *));

static struct symtab *get_java_class_symtab PARAMS ((void));

static char *get_java_utf8_name PARAMS ((struct obstack * obstack, value_ptr name));

static int java_class_is_primitive PARAMS ((value_ptr clas));

static struct type *java_lookup_type PARAMS ((char *signature));

static value_ptr java_value_string PARAMS ((char *ptr, int len));

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

/* 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 PARAMS ((struct type *, value_ptr));

static struct objfile *

get_dynamics_objfile ()

{

  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;

/* Maximum number of class in class_symtab before relocation is needed. */

static int class_symtab_space;

static struct symtab *

get_java_class_symtab ()

{

  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->symbol_obstack, sizeof (struct blockvector));

      BLOCKVECTOR_NBLOCKS (bv) = 1;

      BLOCKVECTOR (class_symtab) = bv;

      /* Allocate dummy STATIC_BLOCK. */

      bl = (struct block *)

        obstack_alloc (&objfile->symbol_obstack, sizeof (struct block));

      BLOCK_NSYMS (bl) = 0;

      BLOCK_START (bl) = 0;

      BLOCK_END (bl) = 0;

      BLOCK_FUNCTION (bl) = NULL;

      BLOCK_SUPERBLOCK (bl) = NULL;

      BLOCK_GCC_COMPILED (bl) = 0;

      BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl;

      /* Allocate GLOBAL_BLOCK.  This has to be relocatable. */

      class_symtab_space = 128;

      bl = (struct block *)

        mmalloc (objfile->md,

                 sizeof (struct block)

                 + ((class_symtab_space - 1) * sizeof (struct symbol *)));

      *bl = *BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK);

      BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl;

      class_symtab->free_ptr = (char *) bl;

    }

  return class_symtab;

}

static void

add_class_symtab_symbol (sym)

     struct symbol *sym;

{

  struct symtab *symtab = get_java_class_symtab ();

  struct blockvector *bv = BLOCKVECTOR (symtab);

  struct block *bl = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);

  if (BLOCK_NSYMS (bl) >= class_symtab_space)

    {

      /* Need to re-allocate. */

      class_symtab_space *= 2;

      bl = (struct block *)

        mrealloc (symtab->objfile->md, bl,

                  sizeof (struct block)

                  + ((class_symtab_space - 1) * sizeof (struct symbol *)));

      class_symtab->free_ptr = (char *) bl;

      BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl;

    }

  BLOCK_SYM (bl, BLOCK_NSYMS (bl)) = sym;

  BLOCK_NSYMS (bl) = BLOCK_NSYMS (bl) + 1;

}

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

static struct symbol *

add_class_symbol (type, addr)

     struct type *type;

     CORE_ADDR addr;

{

  struct symbol *sym;

  sym = (struct symbol *)

    obstack_alloc (&dynamics_objfile->symbol_obstack, sizeof (struct symbol));

  memset (sym, 0, sizeof (struct symbol));

  SYMBOL_LANGUAGE (sym) = language_java;

  SYMBOL_NAME (sym) = TYPE_TAG_NAME (type);

  SYMBOL_CLASS (sym) = LOC_TYPEDEF;

  /*  SYMBOL_VALUE (sym) = valu; */

  SYMBOL_TYPE (sym) = type;

  SYMBOL_NAMESPACE (sym) = STRUCT_NAMESPACE;

  SYMBOL_VALUE_ADDRESS (sym) = addr;

  return sym;

}

#endif

struct type *

java_lookup_class (name)

     char *name;

{

  struct symbol *sym;

  sym = lookup_symbol (name, expression_context_block, STRUCT_NAMESPACE,

                       (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->type_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 (obstack, name)

     struct obstack *obstack;

     value_ptr name;

{

  char *chrs;

  value_ptr 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_section (data_addr, chrs, name_length, NULL);

  return chrs;

}

value_ptr

java_class_from_object (obj_val)

     value_ptr obj_val;

{

  /* This is all rather inefficient, since the offsets of vtable and

     class are fixed.  FIXME */

  value_ptr 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_pointer (obj_val), NULL);

  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 (clas)

     value_ptr clas;

{

  value_ptr vtable = value_struct_elt (&clas, NULL, "vtable", NULL, "struct");

  CORE_ADDR i = value_as_pointer (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 (clas)

     value_ptr clas;

{

  struct type *type;

  char *name;

  value_ptr temp;

  struct objfile *objfile;

  value_ptr utf8_name;

  char *nptr;

  CORE_ADDR addr;

  struct block *bl;

  int i;

  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);

  for (i = BLOCK_NSYMS (bl); --i >= 0;)

    {

      struct symbol *sym = BLOCK_SYM (bl, i);

      if (SYMBOL_VALUE_ADDRESS (sym) == addr)

        return SYMBOL_TYPE (sym);

    }

#endif

  objfile = get_dynamics_objfile ();

  if (java_class_is_primitive (clas))

    {

      value_ptr 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->type_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->type_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");

      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 (type, clas)

     struct type *type;

     value_ptr clas;

{

  value_ptr 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;

  value_ptr fields, field, method, methods;

  int i, j;

  struct objfile *objfile = get_dynamics_objfile ();

  struct type *tsuper;

  unqualified_name = strrchr (name, '.');

  if (unqualified_name == NULL)

    unqualified_name = name;

  temp = clas;

  temp = value_struct_elt (&temp, NULL, "superclass", NULL, "structure");

  if (name != NULL && 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));

          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->type_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->symbol_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));

          VALUE_LAZY (method) = 1;

        }

      /* Get method name. */

      temp = method;

      temp = value_struct_elt (&temp, NULL, "name", NULL, "structure");

      mname = get_java_utf8_name (&objfile->type_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->type_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->symbol_obstack, j);

  memcpy (TYPE_FN_FIELDLISTS (type), fn_fieldlists, j);

  return type;

}

static struct type *java_object_type;

struct type *

get_java_object_type ()

{

  if (java_object_type == NULL)

    {

      struct symbol *sym;

      sym = lookup_symbol ("java.lang.Object", NULL, STRUCT_NAMESPACE,

                           (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 ()

{

  struct type *objtype = get_java_object_type ();

  if (objtype == NULL)

    return (2 * TARGET_PTR_BIT / TARGET_CHAR_BIT);

  else

    return TYPE_LENGTH (objtype);

}

int

is_object_type (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);