2015-05-22 Pascal Obry <obry@adacore.com>

[official-gcc.git] / gcc / java / decl.c

/* Process declarations and variables for the GNU compiler for the
   Java(TM) language.
   Copyright (C) 1996-2015 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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, or (at your option)
any later version.

GCC 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 GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.

Java and all Java-based marks are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries.
The Free Software Foundation is independent of Sun Microsystems, Inc.  */

/* Hacked by Per Bothner <bothner@cygnus.com> February 1996. */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "hash-set.h"
#include "machmode.h"
#include "vec.h"
#include "double-int.h"
#include "input.h"
#include "alias.h"
#include "symtab.h"
#include "options.h"
#include "real.h"
#include "wide-int.h"
#include "inchash.h"
#include "tree.h"
#include "stor-layout.h"
#include "stringpool.h"
#include "varasm.h"
#include "diagnostic-core.h"
#include "toplev.h"
#include "flags.h"
#include "java-tree.h"
#include "jcf.h"
#include "java-except.h"
#include "ggc.h"
#include "hash-map.h"
#include "is-a.h"
#include "plugin-api.h"
#include "tm.h"
#include "hard-reg-set.h"
#include "input.h"
#include "function.h"
#include "ipa-ref.h"
#include "cgraph.h"
#include "tree-inline.h"
#include "target.h"
#include "version.h"
#include "tree-iterator.h"
#include "langhooks.h"

#if defined (DEBUG_JAVA_BINDING_LEVELS)
extern void indent (void);
#endif

static tree push_jvm_slot (int, tree);
static tree lookup_name_current_level (tree);
static tree push_promoted_type (const char *, tree);
static struct binding_level *make_binding_level (void);
static tree create_primitive_vtable (const char *);
static tree check_local_unnamed_variable (tree, tree, tree);
static void parse_version (void);


/* The following ABI flags are used in the high-order bits of the version
   ID field. The version ID number itself should never be larger than 
   0xfffff, so it should be safe to use top 12 bits for these flags. */

#define FLAG_BINARYCOMPAT_ABI (1<<31)  /* Class is built with the BC-ABI. */

#define FLAG_BOOTSTRAP_LOADER (1<<30)  /* Used when defining a class that 
                                          should be loaded by the bootstrap
                                          loader.  */

/* If an ABI change is made within a GCC release series, rendering current
   binaries incompatible with the old runtimes, this number must be set to
   enforce the compatibility rules. */
#define MINOR_BINARYCOMPAT_ABI_VERSION 1

/* The runtime may recognize a variety of BC ABIs (objects generated by 
   different version of gcj), but will probably always require strict 
   matching for the ordinary (C++) ABI.  */

/* The version ID of the BC ABI that we generate.  This must be kept in
   sync with parse_version(), libgcj, and reality (if the BC format changes, 
   this must change).  */
#define GCJ_CURRENT_BC_ABI_VERSION \
  (4 * 100000 + 0 * 1000 + MINOR_BINARYCOMPAT_ABI_VERSION)

/* The ABI version number.  */
tree gcj_abi_version;

/* Name of the Cloneable class.  */
tree java_lang_cloneable_identifier_node;

/* Name of the Serializable class.  */
tree java_io_serializable_identifier_node;

/* The DECL_MAP is a mapping from (index, type) to a decl node.
   If index < max_locals, it is the index of a local variable.
   if index >= max_locals, then index-max_locals is a stack slot.
   The DECL_MAP mapping is represented as a TREE_VEC whose elements
   are a list of decls (VAR_DECL or PARM_DECL) chained by
   DECL_LOCAL_SLOT_CHAIN; the index finds the TREE_VEC element, and then
   we search the chain for a decl with a matching TREE_TYPE. */

static GTY(()) tree decl_map;

/* The base_decl_map is contains one variable of ptr_type: this is
   used to contain every variable of reference type that is ever
   stored in a local variable slot.  */

static GTY(()) tree base_decl_map;

/* An index used to make temporary identifiers unique.  */
static int uniq;

/* A list of local variables VAR_DECLs for this method that we have seen
   debug information, but we have not reached their starting (byte) PC yet. */

static GTY(()) tree pending_local_decls;

/* The decl for "_Jv_ResolvePoolEntry".  */
tree soft_resolvepoolentry_node;

/* The decl for the .constants field of an instance of Class.  */
tree constants_field_decl_node;

/* The decl for the .data field of an instance of Class.  */
tree constants_data_field_decl_node;

#if defined(DEBUG_JAVA_BINDING_LEVELS)
int binding_depth = 0;
int is_class_level = 0;
int current_pc;

void
indent (void)
{
  int i;

  for (i = 0; i < binding_depth*2; i++)
    putc (' ', stderr);
}
#endif /* defined(DEBUG_JAVA_BINDING_LEVELS) */

/* True if decl is a named local variable, i.e. if it is an alias
   that's used only for debugging purposes.  */

static bool
debug_variable_p (tree decl)
{
  if (TREE_CODE (decl) == PARM_DECL)
    return false;

  if (LOCAL_SLOT_P (decl))
    return false;

  return true;
}
 
static tree
push_jvm_slot (int index, tree decl)
{
  DECL_CONTEXT (decl) = current_function_decl;
  layout_decl (decl, 0);

  /* Now link the decl into the decl_map. */
  if (DECL_LANG_SPECIFIC (decl) == NULL)
    {
      MAYBE_CREATE_VAR_LANG_DECL_SPECIFIC (decl);
      DECL_LOCAL_START_PC (decl) = 0;
      DECL_LOCAL_END_PC (decl) = DECL_CODE_LENGTH (current_function_decl);
      DECL_LOCAL_SLOT_NUMBER (decl) = index;
    }
  DECL_LOCAL_SLOT_CHAIN (decl) = TREE_VEC_ELT (decl_map, index);
  TREE_VEC_ELT (decl_map, index) = decl;

  return decl;
}

/* Find the best declaration based upon type.  If 'decl' fits 'type' better
   than 'best', return 'decl'.  Otherwise return 'best'.  */

static tree
check_local_unnamed_variable (tree best, tree decl, tree type)
{
  tree decl_type = TREE_TYPE (decl);
  
  gcc_assert (! LOCAL_VAR_OUT_OF_SCOPE_P (decl));

  /* Use the same decl for all integer types <= 32 bits.  This is
     necessary because sometimes a value is stored as (for example)
     boolean but loaded as int.  */
  if (decl_type == type
      || (INTEGRAL_TYPE_P (decl_type)
          && INTEGRAL_TYPE_P (type)
          && TYPE_PRECISION (decl_type) <= 32
          && TYPE_PRECISION (type) <= 32
          && TYPE_PRECISION (decl_type) >= TYPE_PRECISION (type))      
      /*  ptr_type_node is used for null pointers, which are
          assignment compatible with everything.  */
      || (TREE_CODE (decl_type) == POINTER_TYPE
          && type == ptr_type_node)
      /* Whenever anyone wants to use a slot that is initially
         occupied by a PARM_DECL of pointer type they must get that
         decl, even if they asked for a pointer to a different type.
         However, if someone wants a scalar variable in a slot that
         initially held a pointer arg -- or vice versa -- we create a
         new VAR_DECL.  

         ???: As long as verification is correct, this will be a
         compatible type.  But maybe we should create a dummy variable
         and replace all references to it with the DECL and a
         NOP_EXPR.  
      */
      || (TREE_CODE (decl_type) == POINTER_TYPE
          && TREE_CODE (decl) == PARM_DECL
          && TREE_CODE (type) == POINTER_TYPE))
    {
      if (best == NULL_TREE
          || (decl_type == type && TREE_TYPE (best) != type))
        return decl;
    }

  return best;
}


/* Find a VAR_DECL (or PARM_DECL) at local index INDEX that has type TYPE,
   that is valid at PC (or -1 if any pc).
   If there is no existing matching decl, allocate one.  */

tree
find_local_variable (int index, tree type, int pc ATTRIBUTE_UNUSED)
{
  tree tmp = TREE_VEC_ELT (decl_map, index);
  tree decl = NULL_TREE;

  /* Scan through every declaration that has been created in this
     slot.  We're only looking for variables that correspond to local
     index declarations and PARM_DECLs, not named variables: such
     local variables are used only for debugging information.  */
  while (tmp != NULL_TREE)
    {
      if (! debug_variable_p (tmp))
        decl = check_local_unnamed_variable (decl, tmp, type);
      tmp = DECL_LOCAL_SLOT_CHAIN (tmp);
    }

  /* gcj has a function called promote_type(), which is used by both
     the bytecode compiler and the source compiler.  Unfortunately,
     the type systems for the Java VM and the Java language are not
     the same: a boolean in the VM promotes to an int, not to a wide
     boolean.  If our caller wants something to hold a boolean, that
     had better be an int, because that slot might be re-used
     later in integer context.  */
  if (TREE_CODE (type) == BOOLEAN_TYPE)
    type = integer_type_node;

  /* If we don't find a match, create one with the type passed in.
     The name of the variable is #n#m, which n is the variable index
     in the local variable area and m is a dummy identifier for
     uniqueness -- multiple variables may share the same local
     variable index.  We don't call pushdecl() to push pointer types
     into a binding expr because they'll all be replaced by a single
     variable that is used for every reference in that local variable
     slot.  */
  if (! decl)
    {
      char buf[64];
      tree name;
      sprintf (buf, "#slot#%d#%d", index, uniq++);
      name = get_identifier (buf);
      decl = build_decl (input_location, VAR_DECL, name, type);
      DECL_IGNORED_P (decl) = 1;
      DECL_ARTIFICIAL (decl) = 1;
      decl = push_jvm_slot (index, decl);
      LOCAL_SLOT_P (decl) = 1;

      if (TREE_CODE (type) != POINTER_TYPE)
        pushdecl_function_level (decl);
    }

  /* As well as creating a local variable that matches the type, we
     also create a base variable (of ptr_type) that will hold all its
     aliases.  */
  if (TREE_CODE (type) == POINTER_TYPE
      && ! TREE_VEC_ELT (base_decl_map, index))
    {
      char buf[64];
      tree name;
      tree base_decl;
      sprintf (buf, "#ref#%d#%d", index, uniq++);
      name = get_identifier (buf);
      base_decl
        = TREE_VEC_ELT (base_decl_map, index)
        = build_decl (input_location, VAR_DECL, name, ptr_type_node);
      pushdecl_function_level (base_decl);
      DECL_IGNORED_P (base_decl) = 1;
      DECL_ARTIFICIAL (base_decl) = 1;
    }

  return decl;
}

/* Called during genericization for every variable.  If the variable
   is a temporary of pointer type, replace it with a common variable
   thath is used to hold all pointer types that are ever stored in
   that slot.  Set WANT_LVALUE if you want a variable that is to be
   written to.  */

static tree 
java_replace_reference (tree var_decl, bool want_lvalue)
{
  tree decl_type;

  if (! base_decl_map)
    return var_decl;

  decl_type = TREE_TYPE (var_decl);

  if (TREE_CODE (decl_type) == POINTER_TYPE)
    {
      if (DECL_LANG_SPECIFIC (var_decl)
          && LOCAL_SLOT_P (var_decl))
        {
          int index = DECL_LOCAL_SLOT_NUMBER (var_decl);
          tree base_decl = TREE_VEC_ELT (base_decl_map, index); 

          gcc_assert (base_decl);
          if (! want_lvalue)
            base_decl = build1 (NOP_EXPR, decl_type, base_decl);

          return base_decl;
        }
    }

  return var_decl;
}

/* Helper for java_genericize.  */

tree
java_replace_references (tree *tp, int *walk_subtrees,
                         void *data ATTRIBUTE_UNUSED)
{
  if (TREE_CODE (*tp) == MODIFY_EXPR)
    {
      source_location loc = EXPR_LOCATION (*tp);
      tree lhs = TREE_OPERAND (*tp, 0);
      /* This is specific to the bytecode compiler.  If a variable has
         LOCAL_SLOT_P set, replace an assignment to it with an assignment
         to the corresponding variable that holds all its aliases.  */
      if (TREE_CODE (lhs) == VAR_DECL
          && DECL_LANG_SPECIFIC (lhs)
          && LOCAL_SLOT_P (lhs)
          && TREE_CODE (TREE_TYPE (lhs)) == POINTER_TYPE)
        {
          tree new_lhs = java_replace_reference (lhs, /* want_lvalue */ true);
          tree new_rhs = build1 (NOP_EXPR, TREE_TYPE (new_lhs),
                                 TREE_OPERAND (*tp, 1));
          tree tem = build2 (MODIFY_EXPR, TREE_TYPE (new_lhs),
                             new_lhs, new_rhs);
          *tp = build1 (NOP_EXPR, TREE_TYPE (lhs), tem);
          SET_EXPR_LOCATION (tem, loc);
          SET_EXPR_LOCATION (new_rhs, loc);
          SET_EXPR_LOCATION (*tp, loc);
        }
    }
  if (TREE_CODE (*tp) == VAR_DECL)
    {
      *tp = java_replace_reference (*tp, /* want_lvalue */ false);
      *walk_subtrees = 0;
    }

  return NULL_TREE;
}

/* Same as find_local_index, except that INDEX is a stack index. */

tree
find_stack_slot (int index, tree type)
{
  return find_local_variable (index + DECL_MAX_LOCALS (current_function_decl),
                              type, -1);
}

struct GTY(())
  binding_level {
    /* A chain of _DECL nodes for all variables, constants, functions,
     * and typedef types.  These are in the reverse of the order supplied.
     */
    tree names;

    /* For each level, a list of shadowed outer-level local definitions
       to be restored when this level is popped.
       Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
       whose TREE_VALUE is its old definition (a kind of ..._DECL node).  */
    tree shadowed;

    /* For each level (except not the global one),
       a chain of BLOCK nodes for all the levels
       that were entered and exited one level down.  */
    tree blocks;

    /* The binding level which this one is contained in (inherits from).  */
    struct binding_level *level_chain;

    /* The bytecode PC that marks the end of this level. */
    int end_pc;
    /* The bytecode PC that marks the start of this level. */
    int start_pc;

    /* The statements in this binding level.  */
    tree stmts;

    /* An exception range associated with this binding level.  */
    struct eh_range * GTY((skip (""))) exception_range;

    /* Binding depth at which this level began.  Used only for debugging.  */
    unsigned binding_depth;

    /* The location at which this level began.  */
    source_location loc;
  };

#define NULL_BINDING_LEVEL (struct binding_level *) NULL

/* The binding level currently in effect.  */

static GTY(()) struct binding_level *current_binding_level;

/* A chain of binding_level structures awaiting reuse.  */

static GTY(()) struct binding_level *free_binding_level;

/* The outermost binding level, for names of file scope.
   This is created when the compiler is started and exists
   through the entire run.  */

static GTY(()) struct binding_level *global_binding_level;

/* The binding level that holds variables declared at the outermost
   level within a function body.  */

static struct binding_level *function_binding_level;

/* A PC value bigger than any PC value we may ever may encounter. */

#define LARGEST_PC (( (unsigned int)1 << (HOST_BITS_PER_INT - 1)) - 1)

/* Binding level structures are initialized by copying this one.  */

static const struct binding_level clear_binding_level
= {
    NULL_TREE, /* names */
    NULL_TREE, /* shadowed */
    NULL_TREE, /* blocks */
    NULL_BINDING_LEVEL, /* level_chain */
    LARGEST_PC, /* end_pc */
    0, /* start_pc */
    NULL, /* stmts */
    NULL, /* exception_range */
    0, /* binding_depth */
    0, /* loc */
  };

tree java_global_trees[JTI_MAX];

/* Build (and pushdecl) a "promoted type" for all standard
   types shorter than int.  */

static tree
push_promoted_type (const char *name, tree actual_type)
{
  tree type = make_node (TREE_CODE (actual_type));
#if 1
  tree in_min = TYPE_MIN_VALUE (int_type_node);
  tree in_max = TYPE_MAX_VALUE (int_type_node);
#else
  tree in_min = TYPE_MIN_VALUE (actual_type);
  tree in_max = TYPE_MAX_VALUE (actual_type);
#endif
  TYPE_MIN_VALUE (type) = copy_node (in_min);
  TREE_TYPE (TYPE_MIN_VALUE (type)) = type;
  TYPE_MAX_VALUE (type) = copy_node (in_max);
  TREE_TYPE (TYPE_MAX_VALUE (type)) = type;
  TYPE_PRECISION (type) = TYPE_PRECISION (int_type_node);
  TYPE_STRING_FLAG (type) = TYPE_STRING_FLAG (actual_type);
  layout_type (type);
  pushdecl (build_decl (input_location,
                        TYPE_DECL, get_identifier (name), type));
  return type;
}

/* Return tree that represents a vtable for a primitive array.  */
static tree
create_primitive_vtable (const char *name)
{
  tree r;
  char buf[50];

  sprintf (buf, "_Jv_%sVTable", name);
  r = build_decl (input_location,
                  VAR_DECL, get_identifier (buf), ptr_type_node);
  DECL_EXTERNAL (r) = 1;
  return r;
}

/* Parse the version string and compute the ABI version number.  */
static void
parse_version (void)
{
  const char *p = version_string;
  unsigned int major = 0, minor = 0;
  unsigned int abi_version;

  /* Skip leading junk.  */
  while (*p && !ISDIGIT (*p))
    ++p;
  gcc_assert (*p);

  /* Extract major version.  */
  while (ISDIGIT (*p))
    {
      major = major * 10 + *p - '0';
      ++p;
    }

  gcc_assert (*p == '.' && ISDIGIT (p[1]));
  ++p;

  /* Extract minor version.  */
  while (ISDIGIT (*p))
    {
      minor = minor * 10 + *p - '0';
      ++p;
    }

  if (flag_indirect_dispatch)
    {
      abi_version = GCJ_CURRENT_BC_ABI_VERSION;
      abi_version |= FLAG_BINARYCOMPAT_ABI;
    }
  else /* C++ ABI */
    {
      /* Implicit in this computation is the idea that we won't break the
         old-style binary ABI in a sub-minor release (e.g., from 4.0.0 to
         4.0.1).  */
      abi_version = 100000 * major + 1000 * minor;
    }
  if (flag_bootstrap_classes)
    abi_version |= FLAG_BOOTSTRAP_LOADER;

  gcj_abi_version = build_int_cstu (ptr_type_node, abi_version);
}

void
java_init_decl_processing (void)
{
  tree field = NULL_TREE;
  tree t;

  init_class_processing ();

  current_function_decl = NULL;
  current_binding_level = NULL_BINDING_LEVEL;
  free_binding_level = NULL_BINDING_LEVEL;
  pushlevel (0);        /* make the binding_level structure for global names */
  global_binding_level = current_binding_level;

  /* Build common tree nodes, Java has an unsigned char.  */
  build_common_tree_nodes (false, false);

  /* ???  Now we continue and override some of the built types again
     with Java specific types.  As the above generated types are
     supposed to match the targets C ABI this isn't really the way
     to go and any Java specifics should _not_ use those global types
     if the Java ABI does not match the C one.  */

  byte_type_node = make_signed_type (8);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("byte"), byte_type_node));
  short_type_node = make_signed_type (16);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("short"), short_type_node));
  int_type_node = make_signed_type (32);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("int"), int_type_node));
  long_type_node = make_signed_type (64);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("long"), long_type_node));

  unsigned_byte_type_node = make_unsigned_type (8);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("unsigned byte"),
                        unsigned_byte_type_node));
  unsigned_short_type_node = make_unsigned_type (16);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("unsigned short"),
                        unsigned_short_type_node));
  unsigned_int_type_node = make_unsigned_type (32);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("unsigned int"),
                        unsigned_int_type_node));
  unsigned_long_type_node = make_unsigned_type (64);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("unsigned long"),
                        unsigned_long_type_node));

  /* Define these next since types below may used them.  */
  integer_type_node = java_type_for_size (INT_TYPE_SIZE, 0);
  integer_zero_node = build_int_cst (NULL_TREE, 0);
  integer_one_node = build_int_cst (NULL_TREE, 1);
  integer_two_node = build_int_cst (NULL_TREE, 2);
  integer_three_node = build_int_cst (NULL_TREE, 3);
  integer_four_node = build_int_cst (NULL_TREE, 4);
  integer_minus_one_node = build_int_cst (NULL_TREE, -1);

  /* A few values used for range checking in the lexer.  */
  decimal_int_max = build_int_cstu (unsigned_int_type_node, 0x80000000);
  decimal_long_max
    = double_int_to_tree (unsigned_long_type_node,
                          double_int_zero.set_bit (64));

  long_zero_node = build_int_cst (long_type_node, 0);

  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("void"), void_type_node));

  t = make_node (VOID_TYPE);
  layout_type (t); /* Uses size_zero_node */
  return_address_type_node = build_pointer_type (t);

  char_type_node = make_unsigned_type (16);
  TYPE_STRING_FLAG (char_type_node) = 1;
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("char"), char_type_node));

  boolean_type_node = make_unsigned_type (1);
  TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("boolean"),
                        boolean_type_node));
  boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
  boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);

  promoted_byte_type_node
    = push_promoted_type ("promoted_byte", byte_type_node);
  promoted_short_type_node
    = push_promoted_type ("promoted_short", short_type_node);
  promoted_char_type_node
    = push_promoted_type ("promoted_char", char_type_node);
  promoted_boolean_type_node
    = push_promoted_type ("promoted_boolean", boolean_type_node);

  float_type_node = make_node (REAL_TYPE);
  TYPE_PRECISION (float_type_node) = 32;
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("float"),
                        float_type_node));
  layout_type (float_type_node);

  double_type_node = make_node (REAL_TYPE);
  TYPE_PRECISION (double_type_node) = 64;
  pushdecl (build_decl (BUILTINS_LOCATION,
                        TYPE_DECL, get_identifier ("double"),
                        double_type_node));
  layout_type (double_type_node);

  float_zero_node = build_real (float_type_node, dconst0);
  double_zero_node = build_real (double_type_node, dconst0);

  /* These are the vtables for arrays of primitives.  */
  boolean_array_vtable = create_primitive_vtable ("boolean");
  byte_array_vtable = create_primitive_vtable ("byte");
  char_array_vtable = create_primitive_vtable ("char");
  short_array_vtable = create_primitive_vtable ("short");
  int_array_vtable = create_primitive_vtable ("int");
  long_array_vtable = create_primitive_vtable ("long");
  float_array_vtable = create_primitive_vtable ("float");
  double_array_vtable = create_primitive_vtable ("double");

  one_elt_array_domain_type = build_index_type (integer_one_node);
  utf8const_type = make_node (RECORD_TYPE);
  PUSH_FIELD (input_location,
              utf8const_type, field, "hash", unsigned_short_type_node);
  PUSH_FIELD (input_location,
              utf8const_type, field, "length", unsigned_short_type_node);
  FINISH_RECORD (utf8const_type);
  utf8const_ptr_type = build_pointer_type (utf8const_type);

  atable_type = build_array_type (ptr_type_node, 
                                  one_elt_array_domain_type);
  TYPE_NONALIASED_COMPONENT (atable_type) = 1;
  atable_ptr_type = build_pointer_type (atable_type);

  itable_type = build_array_type (ptr_type_node, 
                                  one_elt_array_domain_type);
  TYPE_NONALIASED_COMPONENT (itable_type) = 1;
  itable_ptr_type = build_pointer_type (itable_type);

  symbol_type = make_node (RECORD_TYPE);
  PUSH_FIELD (input_location,
              symbol_type, field, "clname", utf8const_ptr_type);
  PUSH_FIELD (input_location, symbol_type, field, "name", utf8const_ptr_type);
  PUSH_FIELD (input_location,
              symbol_type, field, "signature", utf8const_ptr_type);
  FINISH_RECORD (symbol_type);

  symbols_array_type = build_array_type (symbol_type, 
                                         one_elt_array_domain_type);
  symbols_array_ptr_type = build_pointer_type (symbols_array_type);

  assertion_entry_type = make_node (RECORD_TYPE);
  PUSH_FIELD (input_location,
              assertion_entry_type, field, "assertion_code", integer_type_node);
  PUSH_FIELD (input_location,
              assertion_entry_type, field, "op1", utf8const_ptr_type);
  PUSH_FIELD (input_location,
              assertion_entry_type, field, "op2", utf8const_ptr_type);
  FINISH_RECORD (assertion_entry_type);
  
  assertion_table_type = build_array_type (assertion_entry_type,
                                           one_elt_array_domain_type);

  /* As you're adding items here, please update the code right after
     this section, so that the filename containing the source code of
     the pre-defined class gets registered correctly. */
  unqualified_object_id_node = get_identifier ("Object");
  object_type_node = lookup_class (get_identifier ("java.lang.Object"));
  object_ptr_type_node = promote_type (object_type_node);
  string_type_node = lookup_class (get_identifier ("java.lang.String"));
  string_ptr_type_node = promote_type (string_type_node);
  class_type_node = lookup_class (get_identifier ("java.lang.Class"));
  throwable_type_node = lookup_class (get_identifier ("java.lang.Throwable"));
  exception_type_node = lookup_class (get_identifier ("java.lang.Exception"));
  runtime_exception_type_node = 
    lookup_class (get_identifier ("java.lang.RuntimeException"));
  error_exception_type_node = 
    lookup_class (get_identifier ("java.lang.Error"));

  rawdata_ptr_type_node
    = promote_type (lookup_class (get_identifier ("gnu.gcj.RawData")));

  add_predefined_file (get_identifier ("java/lang/Class.java"));
  add_predefined_file (get_identifier ("java/lang/Error.java"));
  add_predefined_file (get_identifier ("java/lang/Object.java"));
  add_predefined_file (get_identifier ("java/lang/RuntimeException.java"));
  add_predefined_file (get_identifier ("java/lang/String.java"));
  add_predefined_file (get_identifier ("java/lang/Throwable.java"));
  add_predefined_file (get_identifier ("gnu/gcj/RawData.java"));
  add_predefined_file (get_identifier ("java/lang/Exception.java"));
  add_predefined_file (get_identifier ("java/lang/ClassNotFoundException.java"));
  add_predefined_file (get_identifier ("java/lang/NoClassDefFoundError.java"));

  methodtable_type = make_node (RECORD_TYPE);
  layout_type (methodtable_type);
  build_decl (BUILTINS_LOCATION,
              TYPE_DECL, get_identifier ("methodtable"), methodtable_type);
  methodtable_ptr_type = build_pointer_type (methodtable_type);

  TYPE_identifier_node = get_identifier ("TYPE");
  init_identifier_node = get_identifier ("<init>");
  clinit_identifier_node = get_identifier ("<clinit>");
  void_signature_node = get_identifier ("()V");
  finalize_identifier_node = get_identifier ("finalize");
  this_identifier_node = get_identifier ("this");

  java_lang_cloneable_identifier_node = get_identifier ("java.lang.Cloneable");
  java_io_serializable_identifier_node =
    get_identifier ("java.io.Serializable");

  /* for lack of a better place to put this stub call */
  init_expr_processing();

  constants_type_node = make_node (RECORD_TYPE);
  PUSH_FIELD (input_location,
              constants_type_node, field, "size", unsigned_int_type_node);
  PUSH_FIELD (input_location,
              constants_type_node, field, "tags", ptr_type_node);
  PUSH_FIELD (input_location,
              constants_type_node, field, "data", ptr_type_node);
  constants_data_field_decl_node = field;
  FINISH_RECORD (constants_type_node);
  build_decl (BUILTINS_LOCATION,
              TYPE_DECL, get_identifier ("constants"), constants_type_node);

  access_flags_type_node = unsigned_short_type_node;

  dtable_type = make_node (RECORD_TYPE);
  dtable_ptr_type = build_pointer_type (dtable_type);

  otable_type = build_array_type (integer_type_node, 
                                  one_elt_array_domain_type);
  TYPE_NONALIASED_COMPONENT (otable_type) = 1;
  otable_ptr_type = build_pointer_type (otable_type);

  PUSH_FIELD (input_location,
              object_type_node, field, "vtable", dtable_ptr_type);
  DECL_FCONTEXT (field) = object_type_node;
  TYPE_VFIELD (object_type_node) = field;

  /* This isn't exactly true, but it is what we have in the source.
     There is an unresolved issue here, which is whether the vtable
     should be marked by the GC.  */
  if (! flag_hash_synchronization)
    PUSH_FIELD (input_location, object_type_node, field, "sync_info",
                build_pointer_type (object_type_node));
  for (t = TYPE_FIELDS (object_type_node); t != NULL_TREE; t = DECL_CHAIN (t))
    FIELD_PRIVATE (t) = 1;
  FINISH_RECORD (object_type_node);

  field_type_node = make_node (RECORD_TYPE);
  field_ptr_type_node = build_pointer_type (field_type_node);
  method_type_node = make_node (RECORD_TYPE);
  method_ptr_type_node = build_pointer_type (method_type_node);

  set_super_info (0, class_type_node, object_type_node, 0);
  set_super_info (0, string_type_node, object_type_node, 0);
  class_ptr_type = build_pointer_type (class_type_node);

  PUSH_FIELD (input_location,
              class_type_node, field, "next_or_version", class_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "name", utf8const_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "accflags", access_flags_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "superclass", class_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "constants", constants_type_node);
  constants_field_decl_node = field;
  PUSH_FIELD (input_location,
              class_type_node, field, "methods", method_ptr_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "method_count", short_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "vtable_method_count", short_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "fields", field_ptr_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "size_in_bytes", int_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "field_count", short_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "static_field_count", short_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "vtable", dtable_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "otable", otable_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "otable_syms", 
              symbols_array_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "atable", atable_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "atable_syms", 
              symbols_array_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "itable", itable_ptr_type);
  PUSH_FIELD (input_location, class_type_node, field, "itable_syms", 
              symbols_array_ptr_type);
  PUSH_FIELD (input_location,
              class_type_node, field, "catch_classes", ptr_type_node);
  PUSH_FIELD (input_location, class_type_node, field, "interfaces",
              build_pointer_type (class_ptr_type));
  PUSH_FIELD (input_location, class_type_node, field, "loader", ptr_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "interface_count", short_type_node);
  PUSH_FIELD (input_location, class_type_node, field, "state", byte_type_node);
  PUSH_FIELD (input_location, class_type_node, field, "thread", ptr_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "depth", short_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "ancestors", ptr_type_node);
  PUSH_FIELD (input_location, class_type_node, field, "idt", ptr_type_node);  
  PUSH_FIELD (input_location,
              class_type_node, field, "arrayclass", ptr_type_node);  
  PUSH_FIELD (input_location,
              class_type_node, field, "protectionDomain", ptr_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "assertion_table", ptr_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "hack_signers", ptr_type_node);
  PUSH_FIELD (input_location, class_type_node, field, "chain", ptr_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "aux_info", ptr_type_node);
  PUSH_FIELD (input_location, class_type_node, field, "engine", ptr_type_node);
  PUSH_FIELD (input_location,
              class_type_node, field, "reflection_data", ptr_type_node);
  for (t = TYPE_FIELDS (class_type_node);  t != NULL_TREE;  t = DECL_CHAIN (t))
    FIELD_PRIVATE (t) = 1;
  push_super_field (class_type_node, object_type_node);

  FINISH_RECORD (class_type_node);
  build_decl (BUILTINS_LOCATION,
              TYPE_DECL, get_identifier ("Class"), class_type_node);

  field_info_union_node = make_node (UNION_TYPE);
  PUSH_FIELD (input_location,
              field_info_union_node, field, "boffset", int_type_node);
  PUSH_FIELD (input_location,
              field_info_union_node, field, "addr", ptr_type_node);
  layout_type (field_info_union_node);

  PUSH_FIELD (input_location,
              field_type_node, field, "name", utf8const_ptr_type);
  PUSH_FIELD (input_location, field_type_node, field, "type", class_ptr_type);
  PUSH_FIELD (input_location,
              field_type_node, field, "accflags", access_flags_type_node);
  PUSH_FIELD (input_location,
              field_type_node, field, "bsize", unsigned_short_type_node);
  PUSH_FIELD (input_location,
              field_type_node, field, "info", field_info_union_node);
  FINISH_RECORD (field_type_node);
  build_decl (BUILTINS_LOCATION,
              TYPE_DECL, get_identifier ("Field"), field_type_node);

  nativecode_ptr_array_type_node
    = build_array_type (nativecode_ptr_type_node, one_elt_array_domain_type);

  PUSH_FIELD (input_location,
              dtable_type, field, "class", class_ptr_type);
  PUSH_FIELD (input_location,
              dtable_type, field, "methods", nativecode_ptr_array_type_node);
  FINISH_RECORD (dtable_type);
  build_decl (BUILTINS_LOCATION,
              TYPE_DECL, get_identifier ("dispatchTable"), dtable_type);

  jexception_type = make_node (RECORD_TYPE);
  PUSH_FIELD (input_location,
              jexception_type, field, "start_pc", ptr_type_node);
  PUSH_FIELD (input_location, jexception_type, field, "end_pc", ptr_type_node);
  PUSH_FIELD (input_location,
              jexception_type, field, "handler_pc", ptr_type_node);
  PUSH_FIELD (input_location,
              jexception_type, field, "catch_type", class_ptr_type);
  FINISH_RECORD (jexception_type);
  build_decl (BUILTINS_LOCATION,
              TYPE_DECL, get_identifier ("jexception"), field_type_node);
  jexception_ptr_type = build_pointer_type (jexception_type);

  lineNumberEntry_type = make_node (RECORD_TYPE);
  PUSH_FIELD (input_location,
              lineNumberEntry_type, field, "line_nr", unsigned_short_type_node);
  PUSH_FIELD (input_location,
              lineNumberEntry_type, field, "start_pc", ptr_type_node);
  FINISH_RECORD (lineNumberEntry_type);

  lineNumbers_type = make_node (RECORD_TYPE);
  PUSH_FIELD (input_location,
              lineNumbers_type, field, "length", unsigned_int_type_node);
  FINISH_RECORD (lineNumbers_type);

  PUSH_FIELD (input_location,
              method_type_node, field, "name", utf8const_ptr_type);
  PUSH_FIELD (input_location,
              method_type_node, field, "signature", utf8const_ptr_type);
  PUSH_FIELD (input_location,
              method_type_node, field, "accflags", access_flags_type_node);
  PUSH_FIELD (input_location,
              method_type_node, field, "index", unsigned_short_type_node);
  PUSH_FIELD (input_location,
              method_type_node, field, "ncode", nativecode_ptr_type_node);
  PUSH_FIELD (input_location,
              method_type_node, field, "throws", ptr_type_node);
  FINISH_RECORD (method_type_node);
  build_decl (BUILTINS_LOCATION,
              TYPE_DECL, get_identifier ("Method"), method_type_node);

  end_params_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);

  t = build_function_type_list (ptr_type_node, class_ptr_type, NULL_TREE);
  alloc_object_node = add_builtin_function ("_Jv_AllocObject", t,
                                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  DECL_IS_MALLOC (alloc_object_node) = 1;
  alloc_no_finalizer_node =
    add_builtin_function ("_Jv_AllocObjectNoFinalizer", t,
                          0, NOT_BUILT_IN, NULL, NULL_TREE);
  DECL_IS_MALLOC (alloc_no_finalizer_node) = 1;

  t = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
  soft_initclass_node = add_builtin_function ("_Jv_InitClass", t,
                                              0, NOT_BUILT_IN, NULL, NULL_TREE);
  t = build_function_type_list (ptr_type_node,
                                class_ptr_type, int_type_node, NULL_TREE);
  soft_resolvepoolentry_node
    = add_builtin_function ("_Jv_ResolvePoolEntry", t,
                            0,NOT_BUILT_IN, NULL, NULL_TREE);
  DECL_PURE_P (soft_resolvepoolentry_node) = 1;
  t = build_function_type_list (void_type_node,
                                class_ptr_type, int_type_node, NULL_TREE);
  throw_node = add_builtin_function ("_Jv_Throw", t,
                                     0, NOT_BUILT_IN, NULL, NULL_TREE);
  /* Mark throw_nodes as `noreturn' functions with side effects.  */
  TREE_THIS_VOLATILE (throw_node) = 1;
  TREE_SIDE_EFFECTS (throw_node) = 1;

  t = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
  soft_monitorenter_node
    = add_builtin_function ("_Jv_MonitorEnter", t, 0, NOT_BUILT_IN,
                            NULL, NULL_TREE);
  soft_monitorexit_node
    = add_builtin_function ("_Jv_MonitorExit", t, 0, NOT_BUILT_IN,
                            NULL, NULL_TREE);

  t = build_function_type_list (ptr_type_node,
                                ptr_type_node, int_type_node, NULL_TREE);
  soft_newarray_node
      = add_builtin_function ("_Jv_NewPrimArray", t,
                              0, NOT_BUILT_IN, NULL, NULL_TREE);
  DECL_IS_MALLOC (soft_newarray_node) = 1;

  t = build_function_type_list (ptr_type_node,
                                int_type_node, class_ptr_type,
                                object_ptr_type_node, NULL_TREE);
  soft_anewarray_node
      = add_builtin_function ("_Jv_NewObjectArray", t,
                              0, NOT_BUILT_IN, NULL, NULL_TREE);
  DECL_IS_MALLOC (soft_anewarray_node) = 1;

  t = build_varargs_function_type_list (ptr_type_node,
                                        ptr_type_node, int_type_node,
                                        NULL_TREE);
  soft_multianewarray_node
      = add_builtin_function ("_Jv_NewMultiArray", t,
                              0, NOT_BUILT_IN, NULL, NULL_TREE);
  DECL_IS_MALLOC (soft_multianewarray_node) = 1;

  t = build_function_type_list (void_type_node, int_type_node, NULL_TREE);
  soft_badarrayindex_node
      = add_builtin_function ("_Jv_ThrowBadArrayIndex", t,
                              0, NOT_BUILT_IN, NULL, NULL_TREE);
  /* Mark soft_badarrayindex_node as a `noreturn' function with side
     effects.  */
  TREE_THIS_VOLATILE (soft_badarrayindex_node) = 1;
  TREE_SIDE_EFFECTS (soft_badarrayindex_node) = 1;

  t = build_function_type_list (void_type_node, NULL_TREE);
  soft_nullpointer_node
    = add_builtin_function ("_Jv_ThrowNullPointerException", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  /* Mark soft_nullpointer_node as a `noreturn' function with side
     effects.  */
  TREE_THIS_VOLATILE (soft_nullpointer_node) = 1;
  TREE_SIDE_EFFECTS (soft_nullpointer_node) = 1;

  soft_abstractmethod_node
    = add_builtin_function ("_Jv_ThrowAbstractMethodError", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  /* Mark soft_abstractmethod_node as a `noreturn' function with side
     effects.  */
  TREE_THIS_VOLATILE (soft_abstractmethod_node) = 1;
  TREE_SIDE_EFFECTS (soft_abstractmethod_node) = 1;

  soft_nosuchfield_node
    = add_builtin_function ("_Jv_ThrowNoSuchFieldError", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  /* Mark soft_nosuchfield_node as a `noreturn' function with side
     effects.  */
  TREE_THIS_VOLATILE (soft_nosuchfield_node) = 1;
  TREE_SIDE_EFFECTS (soft_nosuchfield_node) = 1;

  t = build_function_type_list (ptr_type_node,
                                class_ptr_type, object_ptr_type_node,
                                NULL_TREE);
  soft_checkcast_node
    = add_builtin_function ("_Jv_CheckCast", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  t = build_function_type_list (boolean_type_node,
                                object_ptr_type_node, class_ptr_type,
                                NULL_TREE);
  soft_instanceof_node
    = add_builtin_function ("_Jv_IsInstanceOf", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  DECL_PURE_P (soft_instanceof_node) = 1;
  t = build_function_type_list (void_type_node,
                                object_ptr_type_node, object_ptr_type_node,
                                NULL_TREE);
  soft_checkarraystore_node
    = add_builtin_function ("_Jv_CheckArrayStore", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  t = build_function_type_list (ptr_type_node,
                                ptr_type_node, ptr_type_node, int_type_node,
                                NULL_TREE);
  soft_lookupinterfacemethod_node
    = add_builtin_function ("_Jv_LookupInterfaceMethodIdx", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  DECL_PURE_P (soft_lookupinterfacemethod_node) = 1;

  t = build_function_type_list (ptr_type_node,
                                ptr_type_node, ptr_type_node, ptr_type_node,
                                NULL_TREE);
  soft_lookupinterfacemethodbyname_node
    = add_builtin_function ("_Jv_LookupInterfaceMethod", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  t = build_function_type_list (ptr_type_node,
                                object_ptr_type_node, ptr_type_node,
                                ptr_type_node, int_type_node, NULL_TREE);
  soft_lookupjnimethod_node
    = add_builtin_function ("_Jv_LookupJNIMethod", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  t = build_function_type_list (ptr_type_node, ptr_type_node, NULL_TREE);
  soft_getjnienvnewframe_node
    = add_builtin_function ("_Jv_GetJNIEnvNewFrame", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);
  t = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
  soft_jnipopsystemframe_node
    = add_builtin_function ("_Jv_JNI_PopSystemFrame", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);

  t = build_function_type_list (object_ptr_type_node,
                                object_ptr_type_node, NULL_TREE);
  soft_unwrapjni_node
    = add_builtin_function ("_Jv_UnwrapJNIweakReference", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);

  t = build_function_type_list (int_type_node,
                                int_type_node, int_type_node, NULL_TREE);
  soft_idiv_node
    = add_builtin_function ("_Jv_divI", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);

  soft_irem_node
    = add_builtin_function ("_Jv_remI", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);

  t = build_function_type_list (long_type_node,
                                long_type_node, long_type_node, NULL_TREE);
  soft_ldiv_node
    = add_builtin_function ("_Jv_divJ", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);

  soft_lrem_node
    = add_builtin_function ("_Jv_remJ", t,
                            0, NOT_BUILT_IN, NULL, NULL_TREE);

  initialize_builtins ();

  soft_fmod_node = builtin_decl_explicit (BUILT_IN_FMOD);

  parse_version ();
}


/* Look up NAME in the current binding level and its superiors
   in the namespace of variables, functions and typedefs.
   Return a ..._DECL node of some kind representing its definition,
   or return 0 if it is undefined.  */

tree
lookup_name (tree name)
{
  tree val;
  if (current_binding_level != global_binding_level
      && IDENTIFIER_LOCAL_VALUE (name))
    val = IDENTIFIER_LOCAL_VALUE (name);
  else
    val = IDENTIFIER_GLOBAL_VALUE (name);
  return val;
}

/* Similar to `lookup_name' but look only at current binding level and
   the previous one if it's the parameter level.  */

static tree
lookup_name_current_level (tree name)
{
  tree t;

  if (current_binding_level == global_binding_level)
    return IDENTIFIER_GLOBAL_VALUE (name);

  if (IDENTIFIER_LOCAL_VALUE (name) == 0)
    return 0;

  for (t = current_binding_level->names; t; t = DECL_CHAIN (t))
    if (DECL_NAME (t) == name)
      break;

  return t;
}

/* Record a decl-node X as belonging to the current lexical scope.
   Check for errors (such as an incompatible declaration for the same
   name already seen in the same scope).

   Returns either X or an old decl for the same name.
   If an old decl is returned, it may have been smashed
   to agree with what X says.  */

tree
pushdecl (tree x)
{
  tree t;
  tree name = DECL_NAME (x);
  struct binding_level *b = current_binding_level;
  
  if (TREE_CODE (x) != TYPE_DECL)
    DECL_CONTEXT (x) = current_function_decl;
  if (name)
    {
      t = lookup_name_current_level (name);
      if (t != 0 && t == error_mark_node)
        /* error_mark_node is 0 for a while during initialization!  */
        {
          t = 0;
          error ("%q+D used prior to declaration", x);
        }

      /* If we're naming a hitherto-unnamed type, set its TYPE_NAME
         to point to the TYPE_DECL.
         Since Java does not have typedefs, a type can only have
         one (true) name, given by a class, interface, or builtin. */
      if (TREE_CODE (x) == TYPE_DECL
          && TYPE_NAME (TREE_TYPE (x)) == 0
          && TREE_TYPE (x) != error_mark_node)
        {
          TYPE_NAME (TREE_TYPE (x)) = x;
          TYPE_STUB_DECL (TREE_TYPE (x)) = x;
        }

      /* This name is new in its binding level.
         Install the new declaration and return it.  */
      if (b == global_binding_level)
        {
          /* Install a global value.  */
          
          IDENTIFIER_GLOBAL_VALUE (name) = x;
        }
      else
        {
          /* Here to install a non-global value.  */
          tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
          IDENTIFIER_LOCAL_VALUE (name) = x;

          /* If storing a local value, there may already be one (inherited).
             If so, record it for restoration when this binding level ends.  */
          if (oldlocal != 0)
            b->shadowed = tree_cons (name, oldlocal, b->shadowed);
        }
    }

  /* Put decls on list in reverse order.
     We will reverse them later if necessary.  */
  DECL_CHAIN (x) = b->names;
  b->names = x;

  return x;
}

void
pushdecl_force_head (tree x)
{
  current_binding_level->names = x;
}

/* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate.  */

tree
pushdecl_top_level (tree x)
{
  tree t;
  struct binding_level *b = current_binding_level;

  current_binding_level = global_binding_level;
  t = pushdecl (x);
  current_binding_level = b;
  return t;
}

/* Like pushdecl, only it places X in FUNCTION_BINDING_LEVEL, if appropriate.  */

tree
pushdecl_function_level (tree x)
{
  tree t;
  struct binding_level *b = current_binding_level;

  current_binding_level = function_binding_level;
  t = pushdecl (x);
  current_binding_level = b;
  return t;
}

/* Return true if we are in the global binding level.  */

bool
global_bindings_p (void)
{
  return current_binding_level == global_binding_level;
}

/* Return the list of declarations of the current level.
   Note that this list is in reverse order unless/until
   you nreverse it; and when you do nreverse it, you must
   store the result back using `storedecls' or you will lose.  */

tree
getdecls (void)
{
  return current_binding_level->names;
}

/* Create a new `struct binding_level'.  */

static struct binding_level *
make_binding_level (void)
{
  /* NOSTRICT */
  return ggc_cleared_alloc<binding_level> ();
}

void
pushlevel (int unused ATTRIBUTE_UNUSED)
{
  struct binding_level *newlevel = NULL_BINDING_LEVEL;

  /* Reuse or create a struct for this binding level.  */

  if (free_binding_level)
    {
      newlevel = free_binding_level;
      free_binding_level = free_binding_level->level_chain;
    }
  else
    {
      newlevel = make_binding_level ();
    }

  /* Add this level to the front of the chain (stack) of levels that
     are active.  */

  *newlevel = clear_binding_level;
  newlevel->level_chain = current_binding_level;
  newlevel->loc = input_location;
  current_binding_level = newlevel;  
#if defined(DEBUG_JAVA_BINDING_LEVELS)
  newlevel->binding_depth = binding_depth;
  indent ();
  fprintf (stderr, "push %s level %p pc %d\n",
           (is_class_level) ? "class" : "block", newlevel, current_pc);
  is_class_level = 0;
  binding_depth++;
#endif /* defined(DEBUG_JAVA_BINDING_LEVELS) */
}

/* Exit a binding level.
   Pop the level off, and restore the state of the identifier-decl mappings
   that were in effect when this level was entered.

   If KEEP is nonzero, this level had explicit declarations, so
   and create a "block" (a BLOCK node) for the level
   to record its declarations and subblocks for symbol table output.

   If FUNCTIONBODY is nonzero, this level is the body of a function,
   so create a block as if KEEP were set and also clear out all
   label names.

   If REVERSE is nonzero, reverse the order of decls before putting
   them into the BLOCK.  */

tree
poplevel (int keep, int reverse, int functionbody)
{
  tree link;
  /* The chain of decls was accumulated in reverse order.
     Put it into forward order, just for cleanliness.  */
  tree decls;
  tree subblocks = current_binding_level->blocks;
  tree block = 0;
  tree decl;
  tree bind = 0;

#if defined(DEBUG_JAVA_BINDING_LEVELS)
  binding_depth--;
  indent ();
  if (current_binding_level->end_pc != LARGEST_PC)
    fprintf (stderr, "pop  %s level %p pc %d (end pc %d)\n",
             (is_class_level) ? "class" : "block", current_binding_level, current_pc,
             current_binding_level->end_pc);
  else
    fprintf (stderr, "pop  %s level %p pc %d\n",
             (is_class_level) ? "class" : "block", current_binding_level, current_pc);
#endif /* defined(DEBUG_JAVA_BINDING_LEVELS) */

  /* Get the decls in the order they were written.
     Usually current_binding_level->names is in reverse order.
     But parameter decls were previously put in forward order.  */

  if (reverse)
    current_binding_level->names
      = decls = nreverse (current_binding_level->names);
  else
    decls = current_binding_level->names;

  for (decl = decls; decl; decl = DECL_CHAIN (decl))
    if (TREE_CODE (decl) == VAR_DECL
        && DECL_LANG_SPECIFIC (decl) != NULL
        && DECL_LOCAL_SLOT_NUMBER (decl))
      LOCAL_VAR_OUT_OF_SCOPE_P (decl) = 1;

  /* If there were any declarations in that level,
     or if this level is a function body,
     create a BLOCK to record them for the life of this function.  */

  block = 0;
  if (keep || functionbody)
    block = make_node (BLOCK);

  if (current_binding_level->exception_range)
    expand_end_java_handler (current_binding_level->exception_range);

  if (block != 0)
    {
      /* If any statements have been generated at this level, create a
         BIND_EXPR to hold them and copy the variables to it.  This
         only applies to the bytecode compiler.  */
      if (current_binding_level->stmts)
        {
          tree decl = decls;
          tree *var = &BLOCK_VARS (block);

          /* Copy decls from names list, ignoring labels.  */
          while (decl)
            {
              tree next = DECL_CHAIN (decl);
              if (TREE_CODE (decl) != LABEL_DECL)
                {
                  *var = decl;
                  var = &DECL_CHAIN (decl);
                }
              decl = next;
            }
          *var = NULL;
            
          bind = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (block), 
                         BLOCK_EXPR_BODY (block), block);
          BIND_EXPR_BODY (bind) = current_binding_level->stmts;
          
          if (BIND_EXPR_BODY (bind)
              && TREE_SIDE_EFFECTS (BIND_EXPR_BODY (bind)))
            TREE_SIDE_EFFECTS (bind) = 1;
          
          /* FIXME: gimplifier brain damage.  */
          if (BIND_EXPR_BODY (bind) == NULL)
            BIND_EXPR_BODY (bind) = build_java_empty_stmt ();

          SET_EXPR_LOCATION (bind, current_binding_level->loc);

          current_binding_level->stmts = NULL;
        }
      else
        {
          BLOCK_VARS (block) = decls;
        }
      BLOCK_SUBBLOCKS (block) = subblocks;
    }   

  /* In each subblock, record that this is its superior.  */

  for (link = subblocks; link; link = BLOCK_CHAIN (link))
    BLOCK_SUPERCONTEXT (link) = block;

  /* Clear out the meanings of the local variables of this level.  */

  for (link = decls; link; link = DECL_CHAIN (link))
    {
      tree name = DECL_NAME (link);
      if (name != 0 && IDENTIFIER_LOCAL_VALUE (name) == link)
        {
          /* If the ident. was used or addressed via a local extern decl,
             don't forget that fact.  */
          if (DECL_EXTERNAL (link))
            {
              if (TREE_USED (link))
                TREE_USED (name) = 1;
              if (TREE_ADDRESSABLE (link))
                TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
            }
          IDENTIFIER_LOCAL_VALUE (name) = 0;
        }
    }

  /* Restore all name-meanings of the outer levels
     that were shadowed by this level.  */

  for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
    IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);

  /* If the level being exited is the top level of a function,
     check over all the labels, and clear out the current
     (function local) meanings of their names.  */

  if (functionbody)
    {
      /* If this is the top level block of a function,
         the vars are the function's parameters.
         Don't leave them in the BLOCK because they are
         found in the FUNCTION_DECL instead.  */

      BLOCK_VARS (block) = 0;
    }

  /* Pop the current level, and free the structure for reuse.  */

  {
    struct binding_level *level = current_binding_level;
    current_binding_level = current_binding_level->level_chain;

    level->level_chain = free_binding_level;
    free_binding_level = level;
  }

  /* Dispose of the block that we just made inside some higher level.  */
  if (functionbody)
    {
      DECL_INITIAL (current_function_decl) = block;
      DECL_SAVED_TREE (current_function_decl) = bind;
    }
  else 
    {
      if (block)
        {
          current_binding_level->blocks
            = block_chainon (current_binding_level->blocks, block);
        }
      /* If we did not make a block for the level just exited,
         any blocks made for inner levels
         (since they cannot be recorded as subblocks in that level)
         must be carried forward so they will later become subblocks
         of something else.  */
      else if (subblocks)
        current_binding_level->blocks
          = block_chainon (current_binding_level->blocks, subblocks);

      if (bind)
        java_add_stmt (bind);
    }

  if (block)
    TREE_USED (block) = 1;
  return block;
}

void
maybe_pushlevels (int pc)
{
#if defined(DEBUG_JAVA_BINDING_LEVELS)
  current_pc = pc;
#endif

  while (pending_local_decls != NULL_TREE &&
         DECL_LOCAL_START_PC (pending_local_decls) <= pc)
    {
      tree *ptr = &pending_local_decls;
      tree decl = *ptr, next;
      int end_pc = DECL_LOCAL_END_PC (decl);

      while (*ptr != NULL_TREE
             && DECL_LOCAL_START_PC (*ptr) <= pc
             && DECL_LOCAL_END_PC (*ptr) == end_pc)
        ptr = &DECL_CHAIN (*ptr);
      pending_local_decls = *ptr;
      *ptr = NULL_TREE;

      /* Force non-nested range to be nested in current range by
         truncating variable lifetimes. */
      if (end_pc > current_binding_level->end_pc)
        {
          tree t;
          end_pc = current_binding_level->end_pc;
          for (t = decl; t != NULL_TREE; t = DECL_CHAIN (t))
            DECL_LOCAL_END_PC (t) = end_pc;
        }

      maybe_start_try (pc, end_pc);
      
      pushlevel (1);

      current_binding_level->end_pc = end_pc;
      current_binding_level->start_pc = pc;      
      current_binding_level->names = NULL;
      for ( ; decl != NULL_TREE; decl = next)
        {
          int index = DECL_LOCAL_SLOT_NUMBER (decl);
          tree base_decl;
          next = DECL_CHAIN (decl);
          push_jvm_slot (index, decl);
          pushdecl (decl);
          base_decl
            = find_local_variable (index, TREE_TYPE (decl), pc);
          if (TREE_CODE (TREE_TYPE (base_decl)) == POINTER_TYPE)
            base_decl = TREE_VEC_ELT (base_decl_map, index);
          SET_DECL_VALUE_EXPR (decl, base_decl);
          DECL_HAS_VALUE_EXPR_P (decl) = 1;
        }
    }      

  maybe_start_try (pc, 0);
}

void
maybe_poplevels (int pc)
{
#if defined(DEBUG_JAVA_BINDING_LEVELS)
  current_pc = pc;
#endif

  /* FIXME: I'm pretty sure that this is wrong.  Variable scopes are
     inclusive, so a variable is live if pc == end_pc.  Here, we
     terminate a range if the current pc is equal to the end of the
     range, and this is *before* we have generated code for the
     instruction at end_pc.  We're closing a binding level one
     instruction too early.*/
  while (current_binding_level->end_pc <= pc)
    poplevel (1, 0, 0);
}

/* Terminate any binding which began during the range beginning at
   start_pc.  This tidies up improperly nested local variable ranges
   and exception handlers; a variable declared within an exception
   range is forcibly terminated when that exception ends. */

void
force_poplevels (int start_pc)
{
  while (current_binding_level->start_pc > start_pc)
    {
      if (pedantic && current_binding_level->start_pc > start_pc)
        warning (0, "In %+D: overlapped variable and exception ranges at %d",
                 current_function_decl,
                 current_binding_level->start_pc);
      poplevel (1, 0, 0);
    }
}

/* integrate_decl_tree calls this function. */

void
java_dup_lang_specific_decl (tree node)
{
  int lang_decl_size;
  struct lang_decl *x;

  if (!DECL_LANG_SPECIFIC (node))
    return;

  lang_decl_size = sizeof (struct lang_decl);
  x = ggc_alloc<struct lang_decl> ();
  memcpy (x, DECL_LANG_SPECIFIC (node), lang_decl_size);
  DECL_LANG_SPECIFIC (node) = x;
}

void
give_name_to_locals (JCF *jcf)
{
  int i, n = DECL_LOCALVARIABLES_OFFSET (current_function_decl);
  int code_offset = DECL_CODE_OFFSET (current_function_decl);
  tree parm;
  pending_local_decls = NULL_TREE;
  if (n == 0)
    return;
  JCF_SEEK (jcf, n);
  n = JCF_readu2 (jcf);
  for (i = 0; i < n; i++)
    {
      int start_pc = JCF_readu2 (jcf);
      int length = JCF_readu2 (jcf);
      int name_index = JCF_readu2 (jcf);
      int signature_index = JCF_readu2 (jcf);
      int slot = JCF_readu2 (jcf);
      tree name = get_name_constant (jcf, name_index);
      tree type = parse_signature (jcf, signature_index);
      if (slot < DECL_ARG_SLOT_COUNT (current_function_decl)
          && start_pc == 0
          && length == DECL_CODE_LENGTH (current_function_decl))
        {
          tree decl = TREE_VEC_ELT (decl_map, slot);
          DECL_NAME (decl) = name;
          if (TREE_CODE (decl) != PARM_DECL || TREE_TYPE (decl) != type)
            warning (0, "bad type in parameter debug info");
        }
      else
        {
          tree *ptr;
          int end_pc = start_pc + length;
          tree decl = build_decl (input_location, VAR_DECL, name, type);
          if (end_pc > DECL_CODE_LENGTH (current_function_decl))
            {
              warning (0, "bad PC range for debug info for local %q+D",
                       decl);
              end_pc = DECL_CODE_LENGTH (current_function_decl);
            }

          /* Adjust start_pc if necessary so that the local's first
             store operation will use the relevant DECL as a
             destination. Fore more information, read the leading
             comments for expr.c:maybe_adjust_start_pc. */
          start_pc = maybe_adjust_start_pc (jcf, code_offset, start_pc, slot);

          MAYBE_CREATE_VAR_LANG_DECL_SPECIFIC (decl);
          DECL_LOCAL_SLOT_NUMBER (decl) = slot;
          DECL_LOCAL_START_PC (decl) = start_pc;
          DECL_LOCAL_END_PC (decl) = end_pc;

          /* Now insert the new decl in the proper place in
             pending_local_decls.  We are essentially doing an insertion sort,
             which works fine, since the list input will normally already
             be sorted. */
          ptr = &pending_local_decls;
          while (*ptr != NULL_TREE
                 && (DECL_LOCAL_START_PC (*ptr) > start_pc
                     || (DECL_LOCAL_START_PC (*ptr) == start_pc
                         && DECL_LOCAL_END_PC (*ptr) < end_pc)))
            ptr = &DECL_CHAIN (*ptr);
          DECL_CHAIN (decl) = *ptr;
          *ptr = decl;
        }
    }

  pending_local_decls = nreverse (pending_local_decls);

  /* Fill in default names for the parameters. */ 
  for (parm = DECL_ARGUMENTS (current_function_decl), i = 0;
       parm != NULL_TREE;  parm = DECL_CHAIN (parm), i++)
    {
      if (DECL_NAME (parm) == NULL_TREE)
        {
          int arg_i = METHOD_STATIC (current_function_decl) ? i+1 : i;
          if (arg_i == 0)
            DECL_NAME (parm) = get_identifier ("this");
          else
            {
              char buffer[12];
              sprintf (buffer, "ARG_%d", arg_i);
              DECL_NAME (parm) = get_identifier (buffer);
            }
        }
    }
}

tree
build_result_decl (tree fndecl)
{
  tree restype = TREE_TYPE (TREE_TYPE (fndecl));
  tree result = DECL_RESULT (fndecl);
  if (! result)
    {
      result = build_decl (DECL_SOURCE_LOCATION (fndecl),
                           RESULT_DECL, NULL_TREE, restype);
      DECL_ARTIFICIAL (result) = 1;
      DECL_IGNORED_P (result) = 1;
      DECL_CONTEXT (result) = fndecl;
      DECL_RESULT (fndecl) = result;
    }
  return result;
}

void
start_java_method (tree fndecl)
{
  tree tem, *ptr;
  int i;

  uniq = 0;

  current_function_decl = fndecl;
  announce_function (fndecl);

  i = DECL_MAX_LOCALS(fndecl) + DECL_MAX_STACK(fndecl);
  decl_map = make_tree_vec (i);
  base_decl_map = make_tree_vec (i);
  type_map = XRESIZEVEC (tree, type_map, i);

#if defined(DEBUG_JAVA_BINDING_LEVELS)
  fprintf (stderr, "%s:\n", lang_printable_name (fndecl, 2));
  current_pc = 0;
#endif /* defined(DEBUG_JAVA_BINDING_LEVELS) */
  pushlevel (1);  /* Push parameters. */

  ptr = &DECL_ARGUMENTS (fndecl);
  for (tem = TYPE_ARG_TYPES (TREE_TYPE (fndecl)), i = 0;
       tem != end_params_node; tem = TREE_CHAIN (tem), i++)
    {
      tree parm_name = NULL_TREE, parm_decl;
      tree parm_type = TREE_VALUE (tem);
      gcc_assert (i < DECL_MAX_LOCALS (fndecl));

      parm_decl = build_decl (input_location, PARM_DECL, parm_name, parm_type);
      DECL_CONTEXT (parm_decl) = fndecl;
      if (targetm.calls.promote_prototypes (parm_type)
          && TYPE_PRECISION (parm_type) < TYPE_PRECISION (integer_type_node)
          && INTEGRAL_TYPE_P (parm_type))
        parm_type = integer_type_node;
      DECL_ARG_TYPE (parm_decl) = parm_type;

      *ptr = parm_decl;
      ptr = &DECL_CHAIN (parm_decl);

      /* Add parm_decl to the decl_map. */
      push_jvm_slot (i, parm_decl);

      /* The this parameter of methods is artificial.  */
      if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE && i == 0)
        DECL_ARTIFICIAL (parm_decl) = 1;

      type_map[i] = TREE_TYPE (parm_decl);
      if (TYPE_IS_WIDE (TREE_TYPE (parm_decl)))
        {
          i++;
          type_map[i] = void_type_node;
        }
    }
  *ptr = NULL_TREE;
  DECL_ARG_SLOT_COUNT (current_function_decl) = i;

  while (i < DECL_MAX_LOCALS(fndecl))
    type_map[i++] = NULL_TREE;

  build_result_decl (fndecl);
  DECL_SOURCE_LOCATION (fndecl) = input_location;

  /* Push local variables.  */
  pushlevel (2);

  function_binding_level = current_binding_level;
}

void
end_java_method (void)
{
  tree fndecl = current_function_decl;

  /* pop out of function */
  poplevel (1, 1, 0);

  /* pop out of its parameters */
  poplevel (1, 0, 1);

  BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
  
  if (DECL_SAVED_TREE (fndecl))
    {
      tree fbody, block_body;
      /* Before we check initialization, attached all class initialization
         variable to the block_body */
      fbody = DECL_SAVED_TREE (fndecl);
      block_body = BIND_EXPR_BODY (fbody);
      hash_table<treetreehasher> *ht = DECL_FUNCTION_INIT_TEST_TABLE (fndecl);
      ht->traverse<tree, attach_init_test_initialization_flags> (block_body);
    }

  finish_method (fndecl);

  current_function_decl = NULL_TREE;
  base_decl_map = NULL_TREE;
}

/* Prepare a method for expansion.  */

void
finish_method (tree fndecl)
{
  tree *tp = &DECL_SAVED_TREE (fndecl);

  /* Wrap body of synchronized methods in a monitorenter,
     plus monitorexit cleanup.  */
  if (METHOD_SYNCHRONIZED (fndecl))
    {
      tree enter, exit, lock;
      if (METHOD_STATIC (fndecl))
        lock = build_class_ref (DECL_CONTEXT (fndecl));
      else
        lock = DECL_ARGUMENTS (fndecl);
      BUILD_MONITOR_ENTER (enter, lock);
      BUILD_MONITOR_EXIT (exit, lock);
      *tp = build2 (COMPOUND_EXPR, void_type_node, enter,
                    build2 (TRY_FINALLY_EXPR, void_type_node, *tp, exit));
    }

  /* Convert function tree to GENERIC prior to inlining.  */
  java_genericize (fndecl);

  /* Store the end of the function, so that we get good line number
     info for the epilogue.  */
  if (DECL_STRUCT_FUNCTION (fndecl))
    set_cfun (DECL_STRUCT_FUNCTION (fndecl));
  else
    allocate_struct_function (fndecl, false);
  cfun->function_end_locus = DECL_FUNCTION_LAST_LINE (fndecl);

  /* Defer inlining and expansion to the cgraph optimizers.  */
  cgraph_node::finalize_function (fndecl, false);
}

/* We pessimistically marked all methods and fields external until we
   knew what set of classes we were planning to compile.  Now mark those
   associated with CLASS to be generated locally as not external.  */

static void
java_mark_decl_local (tree decl)
{
  DECL_EXTERNAL (decl) = 0;

#ifdef ENABLE_CHECKING
  /* Double check that we didn't pass the function to the callgraph early.  */
  if (TREE_CODE (decl) == FUNCTION_DECL)
    {
      struct cgraph_node *node = cgraph_node::get (decl);
      gcc_assert (!node || !node->definition);
    }
#endif
  gcc_assert (!DECL_RTL_SET_P (decl));
}

/* Given appropriate target support, G++ will emit hidden aliases for native
   methods.  Using this hidden name is required for proper operation of
   _Jv_Method::ncode, but it doesn't hurt to use it everywhere.  Look for
   proper target support, then mark the method for aliasing.  */

static void
java_mark_cni_decl_local (tree decl)
{
#if !defined(HAVE_GAS_HIDDEN) || !defined(ASM_OUTPUT_DEF)
  return;
#endif

  DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
  DECL_LOCAL_CNI_METHOD_P (decl) = 1;

  /* Setting DECL_LOCAL_CNI_METHOD_P changes the behavior of the
     mangler.  We might have already referenced this native method and
     therefore created its name, but even if we have it won't hurt.
     We'll just go via its externally visible name, rather than its
     hidden alias.  However, we must force things so that the correct
     mangling is done.  */

  if (DECL_ASSEMBLER_NAME_SET_P (decl))
    java_mangle_decl (decl);
  if (DECL_RTL_SET_P (decl))
    {
      SET_DECL_RTL (decl, 0);
      make_decl_rtl (decl);
    }
}

/* Use the preceding two functions and mark all members of the class.  */

void
java_mark_class_local (tree klass)
{
  tree t;

  for (t = TYPE_FIELDS (klass); t ; t = DECL_CHAIN (t))
    if (FIELD_STATIC (t))
      {
        if (DECL_EXTERNAL (t))
          vec_safe_push (pending_static_fields, t);
        java_mark_decl_local (t);
      }

  for (t = TYPE_METHODS (klass); t ; t = DECL_CHAIN (t))
    if (!METHOD_ABSTRACT (t))
      {
        if (METHOD_NATIVE (t) && !flag_jni)
          java_mark_cni_decl_local (t);
        else
          java_mark_decl_local (t);
      }
}

/* Add a statement to a compound_expr.  */

tree
add_stmt_to_compound (tree existing, tree type, tree stmt)
{
  if (!stmt)
    return existing;
  else if (existing)
    {
      tree expr = build2 (COMPOUND_EXPR, type, existing, stmt);
      TREE_SIDE_EFFECTS (expr) = TREE_SIDE_EFFECTS (existing)
                                 | TREE_SIDE_EFFECTS (stmt);
      return expr;
    }
  else
    return stmt;
}

/* If this node is an expr, mark its input location.  Called from
   walk_tree().  */

static tree
set_input_location (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
                    void *data ATTRIBUTE_UNUSED)
{
  tree t = *tp;

  if (CAN_HAVE_LOCATION_P (t))
    {
      if (EXPR_HAS_LOCATION(t))
        return t;  /* Don't walk any further into this expr.   */
      else
        SET_EXPR_LOCATION (t, input_location);
    }

  return NULL_TREE;  /* Continue walking this expr.   */
}

/* Add a statement to the statement_list currently being constructed.
   If the statement_list is null, we don't create a singleton list.
   This is necessary because poplevel() assumes that adding a
   statement to a null statement_list returns the statement.  */

tree
java_add_stmt (tree new_stmt)
{
  tree stmts = current_binding_level->stmts;
  tree_stmt_iterator i;

  if (LOCATION_FILE (input_location))
    walk_tree (&new_stmt, set_input_location, NULL, NULL);

  if (stmts == NULL)
    return current_binding_level->stmts = new_stmt;

  /* Force STMTS to be a statement_list.  */
  if (TREE_CODE (stmts) != STATEMENT_LIST)
    {
      tree t = make_node (STATEMENT_LIST);
      i = tsi_last (t);
      tsi_link_after (&i, stmts, TSI_CONTINUE_LINKING);
      stmts = t;
    }  
      
  i = tsi_last (stmts);
  tsi_link_after (&i, new_stmt, TSI_CONTINUE_LINKING);
  TREE_TYPE (stmts) = void_type_node;

  return current_binding_level->stmts = stmts;
}

/* Add a variable to the current scope.  */

tree
java_add_local_var (tree decl)
{
  tree *vars = &current_binding_level->names;
  tree next = *vars;
  DECL_CHAIN (decl) = next;
  *vars = decl;
  DECL_CONTEXT (decl) = current_function_decl;
  MAYBE_CREATE_VAR_LANG_DECL_SPECIFIC (decl);
  return decl;
}

/* Return a pointer to the compound_expr currently being
   constructed.  */

tree *
get_stmts (void)
{
  return &current_binding_level->stmts;
}

/* Register an exception range as belonging to the current binding
   level.  There may only be one: if there are more, we'll create more
   binding levels.  However, each range can have multiple handlers,
   and these are expanded when we call expand_end_java_handler().  */

void
register_exception_range (struct eh_range *range, int pc, int end_pc)
{
  gcc_assert (! current_binding_level->exception_range);
  current_binding_level->exception_range = range;
  current_binding_level->end_pc = end_pc;
  current_binding_level->start_pc = pc;      
}

#include "gt-java-decl.h"