path: root/gnu/egcs/gcc/java/decl.c

/* Process declarations and variables for the GNU compiler for the
   Java(TM) language.

   Copyright (C) 1996, 97-98, 1999 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC 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, or (at your option)
any later version.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

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 "tree.h"
#include "java-tree.h"
#include "jcf.h"
#include "toplev.h"
#include "except.h"

static tree push_jvm_slot PROTO ((int, tree));
static tree builtin_function PROTO ((const char *, tree,
				     enum built_in_function, const char *));
static tree lookup_name_current_level PROTO ((tree));

#ifndef INT_TYPE_SIZE
#define INT_TYPE_SIZE BITS_PER_WORD
#endif

/* 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. */

tree decl_map;

/* 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. */

tree pending_local_decls = NULL_TREE;

/* Push a local variable or stack slot into the decl_map,
   and assign it an rtl. */

static tree
push_jvm_slot (index, decl)
     int index;
     tree decl;
{
  struct rtx_def *rtl = NULL;
  tree type = TREE_TYPE (decl);
  tree tmp;

  DECL_CONTEXT (decl) = current_function_decl;
  layout_decl (decl, 0);

  /* See if we have an appropriate rtl (i.e. same mode) at this index.
     If so, we must use it. */ 
  tmp = TREE_VEC_ELT (decl_map, index);
  while (tmp != NULL_TREE)
    {
      if (TYPE_MODE (type) == TYPE_MODE (TREE_TYPE (tmp)))
	rtl = DECL_RTL (tmp);
      if (rtl != NULL)
	break;
     tmp = DECL_LOCAL_SLOT_CHAIN (tmp);
    }
  if (rtl != NULL)
    DECL_RTL (decl) = rtl;
  else
    {
      if (index >= DECL_MAX_LOCALS (current_function_decl))
	DECL_REGISTER (decl) = 1;
      expand_decl (decl);
    }

  /* Now link the decl into the decl_map. */
  if (DECL_LANG_SPECIFIC (decl) == NULL)
    {
      DECL_LANG_SPECIFIC (decl)
	= (struct lang_decl *) permalloc (sizeof (struct lang_decl_var));
      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 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.
   If we find a decl with matching modes but different types,
   we re-use the rtl, but create a new decl. */

tree
find_local_variable (index, type, pc)
     int index;
     tree type;
     int pc;
{
  tree decl = TREE_VEC_ELT (decl_map, index);
  tree best = NULL_TREE;
  while (decl != NULL_TREE)
    {
      int in_range;
      in_range = pc < 0
	|| (pc >= DECL_LOCAL_START_PC (decl)
	    && pc < DECL_LOCAL_END_PC (decl));

      if ((TREE_TYPE (decl) == type
	   || (TREE_CODE (TREE_TYPE (decl)) == POINTER_TYPE
	       && type == ptr_type_node))
	   && in_range)
	{
	  if (best == NULL_TREE
	      || (TREE_TYPE (decl) == type && TREE_TYPE (best) != type)
	      || DECL_LOCAL_START_PC (decl) > DECL_LOCAL_START_PC (best)
	      || DECL_LOCAL_END_PC (decl) < DECL_LOCAL_START_PC (decl))
	    best = decl;
	}
      decl = DECL_LOCAL_SLOT_CHAIN (decl);
    }
  if (best != NULL_TREE)
    return best;
  return push_jvm_slot (index, build_decl (VAR_DECL, NULL_TREE, type));
}


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

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

struct 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 BLOCK node for this level, if one has been preallocated.
       If 0, the BLOCK is allocated (if needed) when the level is popped.  */
    tree this_block;

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

    /* 1 means make a BLOCK for this level regardless of all else.
       2 for temporary binding contours created by the compiler.  */
    char keep;

    /* Nonzero means make a BLOCK if this level has any subblocks.  */
    char keep_if_subblocks;

    /* Nonzero if this level can safely have additional
       cleanup-needing variables added to it.  */
    char more_cleanups_ok;
    char have_cleanups;

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

#define NULL_BINDING_LEVEL (struct binding_level *) NULL

/* The binding level currently in effect.  */

static struct binding_level *current_binding_level;

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

static 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 struct binding_level *global_binding_level;

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

static struct binding_level clear_binding_level
  = {NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE,
       NULL_BINDING_LEVEL, 0, 0, 0, 0, 1000000000};

#if 0
/* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
   that have names.  Here so we can clear out their names' definitions
   at the end of the function.  */

static tree named_labels;

/* A list of LABEL_DECLs from outer contexts that are currently shadowed.  */

static tree shadowed_labels;
#endif

int flag_traditional;

/* Nonzero means unconditionally make a BLOCK for the next level pushed.  */

static int keep_next_level_flag;

/* Nonzero means make a BLOCK for the next level pushed
   if it has subblocks.  */

static int keep_next_if_subblocks;
  
/* The FUNCTION_DECL for the function currently being compiled,
   or 0 if between functions.  */
tree current_function_decl;

/* The type node for the ordinary character type.  */
tree char_type_node;

tree object_type_node;
tree unqualified_object_id_node;
tree object_ptr_type_node;
tree string_type_node;
tree string_ptr_type_node;
tree throwable_type_node;
tree runtime_exception_type_node;
tree error_exception_type_node;
tree *predef_filenames;
int  predef_filenames_size;

tree boolean_type_node;

tree float_type_node;
tree double_type_node;

/* a VOID_TYPE node.  */

tree void_type_node;
tree ptr_type_node;
tree return_address_type_node;

tree integer_type_node;

tree byte_type_node;
tree short_type_node;
tree int_type_node;
tree long_type_node;

tree promoted_byte_type_node;
tree promoted_short_type_node;
tree promoted_char_type_node;
tree promoted_boolean_type_node;

tree unsigned_byte_type_node;
tree unsigned_short_type_node;
tree unsigned_int_type_node;
tree unsigned_long_type_node;

/* The type for struct methodtable. */
tree methodtable_type;
tree methodtable_ptr_type;

tree utf8const_type;
tree utf8const_ptr_type;
tree class_type_node;
tree class_ptr_type;
tree field_type_node;
tree field_ptr_type_node;
tree field_info_union_node;
tree jexception_type;
tree jexception_ptr_type;
tree lineNumberEntry_type;
tree lineNumbers_type;
tree constants_type_node;
tree dtable_type;
tree dtable_ptr_type;
tree method_type_node;
tree method_ptr_type_node;
tree nativecode_ptr_array_type_node;
tree one_elt_array_domain_type;
tree access_flags_type_node;
tree class_dtable_decl;

/* a node which has tree code ERROR_MARK, and whose type is itself.
   All erroneous expressions are replaced with this node.  All functions
   that accept nodes as arguments should avoid generating error messages
   if this node is one of the arguments, since it is undesirable to get
   multiple error messages from one error in the input.  */

tree error_mark_node;

/* Two expressions that are constants with value zero.
   The first is of type `int', the second of type `void *'.
   Other of type `long', `float' and `double' follow.  */
tree integer_zero_node;
tree null_pointer_node;
tree long_zero_node;
tree float_zero_node;
tree double_zero_node;

tree empty_stmt_node;

/* Nodes for boolean constants TRUE and FALSE. */
tree boolean_true_node, boolean_false_node;

tree TYPE_identifier_node;
tree init_identifier_node;
tree clinit_identifier_node;
tree finit_identifier_node;
tree void_signature_node;
tree length_identifier_node;
tree this_identifier_node;
tree super_identifier_node;
tree continue_identifier_node;

tree end_params_node;

/* References to internal libjava functions we use. */
tree alloc_object_node;
tree soft_instanceof_node;
tree soft_checkcast_node;
tree soft_initclass_node;
tree soft_newarray_node;
tree soft_anewarray_node;
tree soft_multianewarray_node;
tree soft_badarrayindex_node;
tree throw_node;
tree soft_checkarraystore_node;
tree soft_monitorenter_node;
tree soft_monitorexit_node;
tree soft_lookupinterfacemethod_node;
tree soft_fmod_node;
tree soft_exceptioninfo_call_node;

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

static tree
push_promoted_type (name, actual_type)
     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) = build_int_2 (TREE_INT_CST_LOW (in_min),
				       TREE_INT_CST_HIGH (in_min));
  TREE_TYPE (TYPE_MIN_VALUE (type)) = type;
  TYPE_MAX_VALUE (type) = build_int_2 (TREE_INT_CST_LOW (in_max),
				       TREE_INT_CST_HIGH (in_max));
  TREE_TYPE (TYPE_MAX_VALUE (type)) = type;
  TYPE_PRECISION (type) = TYPE_PRECISION (int_type_node);
  layout_type (type);
  pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
  return type;
}

/* Nodes for integer constants.  */
tree integer_one_node, integer_two_node, integer_four_node;
tree integer_negative_one_node;

/* Return a definition for a builtin function named NAME and whose data type
   is TYPE.  TYPE should be a function type with argument types.
   FUNCTION_CODE tells later passes how to compile calls to this function.
   See tree.h for its possible values.

   If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
   the name to be called if we can't opencode the function.  */

static tree
builtin_function (name, type, function_code, library_name)
     const char *name;
     tree type;
     enum built_in_function function_code;
     const char *library_name;
{
  tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
  DECL_EXTERNAL (decl) = 1;
  TREE_PUBLIC (decl) = 1;
  if (library_name)
    DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
  make_decl_rtl (decl, NULL_PTR, 1);
  pushdecl (decl);
  if (function_code != NOT_BUILT_IN)
    {
      DECL_BUILT_IN (decl) = 1;
      DECL_FUNCTION_CODE (decl) = function_code;
    }
  return decl;
}

void
init_decl_processing ()
{
  register tree endlink;
  tree field = NULL_TREE;
  tree t;

  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;

  error_mark_node = make_node (ERROR_MARK);
  TREE_TYPE (error_mark_node) = error_mark_node;

  /* Create sizetype first - needed for other types. */
  sizetype = make_unsigned_type (POINTER_SIZE);
  size_zero_node = build_int_2 (0, 0);
  TREE_TYPE (size_zero_node) = sizetype;
  size_one_node = build_int_2 (1, 0);
  TREE_TYPE (size_one_node) = sizetype;

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

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

  integer_type_node = type_for_size (INT_TYPE_SIZE, 0);

  integer_zero_node = build_int_2 (0, 0);
  integer_one_node = build_int_2 (1, 0);
  integer_two_node = build_int_2 (2, 0);
  integer_four_node = build_int_2 (4, 0);
  integer_negative_one_node = build_int_2 (-1, 0);

  long_zero_node = build_int_2 (0, 0);
  TREE_TYPE (long_zero_node) = long_type_node;

  void_type_node = make_node (VOID_TYPE);
  pushdecl (build_decl (TYPE_DECL, get_identifier ("void"), void_type_node));
  layout_type (void_type_node);	/* Uses size_zero_node */
  ptr_type_node = build_pointer_type (void_type_node);
  t = make_node (VOID_TYPE);
  layout_type (t); /* Uses size_zero_node */
  return_address_type_node = build_pointer_type (t);

  null_pointer_node = build_int_2 (0, 0);
  TREE_TYPE (null_pointer_node) = ptr_type_node;

  /* Used by the parser to represent empty statements and blocks. */
  empty_stmt_node = build1 (NOP_EXPR, void_type_node, size_zero_node);
  CAN_COMPLETE_NORMALLY (empty_stmt_node) = 1;

#if 0
  /* Make a type to be the domain of a few array types
     whose domains don't really matter.
     200 is small enough that it always fits in size_t
     and large enough that it can hold most function names for the
     initializations of __FUNCTION__ and __PRETTY_FUNCTION__.  */
  short_array_type_node = build_prim_array_type (short_type_node, 200);
#endif
  char_type_node = make_node (CHAR_TYPE);
  TYPE_PRECISION (char_type_node) = 16;
  fixup_unsigned_type (char_type_node);
  pushdecl (build_decl (TYPE_DECL, get_identifier ("char"), char_type_node));

  boolean_type_node = make_node (BOOLEAN_TYPE);
  TYPE_PRECISION (boolean_type_node) = 1;
  fixup_unsigned_type (boolean_type_node);
  pushdecl (build_decl (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 (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 (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);

  /* As your 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"));
  runtime_exception_type_node = 
    lookup_class (get_identifier ("java.lang.RuntimeException"));
  error_exception_type_node = 
    lookup_class (get_identifier ("java.lang.Error"));

  /* This section has to be updated as items are added to the previous
     section. */
  predef_filenames_size = 6;
  predef_filenames = (tree *)xmalloc (predef_filenames_size * sizeof (tree));
  predef_filenames [0] = get_identifier ("java/lang/Class.java");
  predef_filenames [1] = get_identifier ("java/lang/Error.java");
  predef_filenames [2] = get_identifier ("java/lang/Object.java");
  predef_filenames [3] = get_identifier ("java/lang/RuntimeException.java");
  predef_filenames [4] = get_identifier ("java/lang/String.java");
  predef_filenames [5] = get_identifier ("java/lang/Throwable.java");

  methodtable_type = make_node (RECORD_TYPE);
  layout_type (methodtable_type);
  build_decl (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>");
  finit_identifier_node = get_identifier ("$finit$");
  void_signature_node = get_identifier ("()V");
  length_identifier_node = get_identifier ("length");
  this_identifier_node = get_identifier ("this");
  super_identifier_node = get_identifier ("super");
  continue_identifier_node = get_identifier ("continue");

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

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

  constants_type_node = make_node (RECORD_TYPE);
  PUSH_FIELD (constants_type_node, field, "size", unsigned_int_type_node);
  PUSH_FIELD (constants_type_node, field, "tags", ptr_type_node);
  PUSH_FIELD (constants_type_node, field, "data", ptr_type_node);
  FINISH_RECORD (constants_type_node);
  build_decl (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);

  PUSH_FIELD (object_type_node, field, "vtable", dtable_ptr_type);
  PUSH_FIELD (object_type_node, field, "sync_info", ptr_type_node);
  for (t = TYPE_FIELDS (object_type_node); t != NULL_TREE; t = TREE_CHAIN (t))
    FIELD_PRIVATE (t) = 1;
  FINISH_RECORD (object_type_node);

  class_dtable_decl = build_dtable_decl (class_type_node);
  TREE_STATIC (class_dtable_decl) = 1;
  DECL_ARTIFICIAL (class_dtable_decl) = 1;
  DECL_IGNORED_P (class_dtable_decl) = 1;
  rest_of_decl_compilation (class_dtable_decl, (char*) 0, 1, 0);

  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 (class_type_node, field, "next", class_ptr_type);
  PUSH_FIELD (class_type_node, field, "name", utf8const_ptr_type);
  PUSH_FIELD (class_type_node, field, "accflags", access_flags_type_node);
  PUSH_FIELD (class_type_node, field, "superclass", class_ptr_type);
  PUSH_FIELD (class_type_node, field, "constants", constants_type_node);
  PUSH_FIELD (class_type_node, field, "methods", method_ptr_type_node);
  PUSH_FIELD (class_type_node, field, "method_count", short_type_node);
  PUSH_FIELD (class_type_node, field, "vtable_method_count", short_type_node);
  PUSH_FIELD (class_type_node, field, "fields", field_ptr_type_node);
  PUSH_FIELD (class_type_node, field, "size_in_bytes", int_type_node);
  PUSH_FIELD (class_type_node, field, "field_count", short_type_node);
  PUSH_FIELD (class_type_node, field, "static_field_count", short_type_node);
  PUSH_FIELD (class_type_node, field, "vtable", dtable_ptr_type);
  PUSH_FIELD (class_type_node, field, "interfaces",
	      build_pointer_type (class_ptr_type));
  PUSH_FIELD (class_type_node, field, "loader", ptr_type_node);
  PUSH_FIELD (class_type_node, field, "interface_count", short_type_node);
  PUSH_FIELD (class_type_node, field, "state", byte_type_node);
  PUSH_FIELD (class_type_node, field, "thread", ptr_type_node);
  for (t = TYPE_FIELDS (class_type_node);  t != NULL_TREE;  t = TREE_CHAIN (t))
    FIELD_PRIVATE (t) = 1;
  push_super_field (class_type_node, object_type_node);
  FINISH_RECORD (class_type_node);
  build_decl (TYPE_DECL, get_identifier ("Class"), class_type_node);

  field_info_union_node = make_node (UNION_TYPE);
  PUSH_FIELD (field_info_union_node, field, "boffset", int_type_node);
  PUSH_FIELD (field_info_union_node, field, "addr", ptr_type_node);
#if 0
  PUSH_FIELD (field_info_union_node, field, "idx", unsigned_short_type_node);
#endif
  layout_type (field_info_union_node);

  PUSH_FIELD (field_type_node, field, "name", utf8const_ptr_type);
  PUSH_FIELD (field_type_node, field, "type", class_ptr_type);
  PUSH_FIELD (field_type_node, field, "accflags", access_flags_type_node);
  PUSH_FIELD (field_type_node, field, "bsize", unsigned_short_type_node);
  PUSH_FIELD (field_type_node, field, "info", field_info_union_node);
  FINISH_RECORD (field_type_node);
  CLASS_LOADED_P (field_type_node) = 1;
  build_decl (TYPE_DECL, get_identifier ("Field"), field_type_node);

  one_elt_array_domain_type = build_index_type (integer_one_node);
  nativecode_ptr_array_type_node
    = build_array_type (nativecode_ptr_type_node, one_elt_array_domain_type);

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

#define jint_type int_type_node
#define jint_ptr_type ptr_type_node

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

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

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

#define instn_ptr_type_node ptr_type_node	/* XXX JH */

#define lineNumbers_ptr_type_node build_pointer_type(lineNumbers_type)

  PUSH_FIELD (method_type_node, field, "name", utf8const_ptr_type);
  PUSH_FIELD (method_type_node, field, "signature", utf8const_ptr_type);
  PUSH_FIELD (method_type_node, field, "accflags", access_flags_type_node);
  PUSH_FIELD (method_type_node, field, "ncode", nativecode_ptr_type_node);
  FINISH_RECORD (method_type_node);
  CLASS_LOADED_P (method_type_node) = 1;
  build_decl (TYPE_DECL, get_identifier ("Method"), method_type_node);

  endlink = end_params_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);

  t = tree_cons (NULL_TREE, class_ptr_type,
		 tree_cons (NULL_TREE, int_type_node, endlink));
  alloc_object_node = builtin_function ("_Jv_AllocObject",
					build_function_type (ptr_type_node, t),
					NOT_BUILT_IN, NULL_PTR);
  soft_initclass_node = builtin_function ("_Jv_InitClass",
					  build_function_type (void_type_node,
							       t),
					  NOT_BUILT_IN, NULL_PTR);
  t = tree_cons (NULL_TREE, ptr_type_node, endlink);
  throw_node = builtin_function ("_Jv_Throw",
				 build_function_type (ptr_type_node, t),
				 NOT_BUILT_IN, NULL_PTR);
  t = build_function_type (int_type_node, endlink);
  soft_monitorenter_node 
      = builtin_function ("_Jv_MonitorEnter", t, NOT_BUILT_IN, NULL_PTR);
  soft_monitorexit_node 
      = builtin_function ("_Jv_MonitorExit", t, NOT_BUILT_IN, NULL_PTR);
  
  t = tree_cons (NULL_TREE, int_type_node, 
		 tree_cons (NULL_TREE, int_type_node, endlink));
  soft_newarray_node
      = builtin_function ("_Jv_NewArray",
			  build_function_type(ptr_type_node, t),
			  NOT_BUILT_IN, NULL_PTR );

  t = tree_cons (NULL_TREE, int_type_node,
		 tree_cons (NULL_TREE, class_ptr_type,
			    tree_cons (NULL_TREE, object_ptr_type_node, endlink)));
  soft_anewarray_node
      = builtin_function ("_Jv_NewObjectArray",
			  build_function_type (ptr_type_node, t),
			  NOT_BUILT_IN, NULL_PTR );

  t = tree_cons (NULL_TREE, ptr_type_node,
		 tree_cons (NULL_TREE, int_type_node, endlink));
  soft_multianewarray_node
      = builtin_function ("_Jv_NewMultiArray",
			  build_function_type (ptr_type_node, t),
			  NOT_BUILT_IN, NULL_PTR );

  t = build_function_type (void_type_node, 
			   tree_cons (NULL_TREE, int_type_node, endlink));
  soft_badarrayindex_node
      = builtin_function ("_Jv_ThrowBadArrayIndex", t, 
			  NOT_BUILT_IN, NULL_PTR);
  TREE_THIS_VOLATILE (soft_badarrayindex_node) = 1;
  TREE_SIDE_EFFECTS (soft_badarrayindex_node) = 1;

  t = tree_cons (NULL_TREE, class_ptr_type,
		 tree_cons (NULL_TREE, object_ptr_type_node, endlink));
  soft_checkcast_node
    = builtin_function ("_Jv_CheckCast",
			build_function_type (ptr_type_node, t),
			NOT_BUILT_IN, NULL_PTR);
  t = tree_cons (NULL_TREE, object_ptr_type_node,
		 tree_cons (NULL_TREE, class_ptr_type, endlink));
  soft_instanceof_node
    = builtin_function ("_Jv_IsInstanceOf",
			build_function_type (promoted_boolean_type_node, t),
			NOT_BUILT_IN, NULL_PTR);
  t = tree_cons (NULL_TREE, object_ptr_type_node,
		 tree_cons (NULL_TREE, object_ptr_type_node, endlink));
  soft_checkarraystore_node
    = builtin_function ("_Jv_CheckArrayStore",
			build_function_type (void_type_node, t),
			NOT_BUILT_IN, NULL_PTR);
  t = tree_cons (NULL_TREE, ptr_type_node,
		 tree_cons (NULL_TREE, ptr_type_node,
			    tree_cons (NULL_TREE, ptr_type_node, endlink)));
  soft_lookupinterfacemethod_node 
    = builtin_function ("_Jv_LookupInterfaceMethod",
			build_function_type (ptr_type_node, t),
			NOT_BUILT_IN, NULL_PTR);
  t = tree_cons (NULL_TREE, double_type_node,
		 tree_cons (NULL_TREE, double_type_node, endlink));
  soft_fmod_node
    = builtin_function ("__builtin_fmod",
			build_function_type (double_type_node, t),
			BUILT_IN_FMOD, "fmod");

  soft_exceptioninfo_call_node
    = build (CALL_EXPR, 
	     ptr_type_node,
	     build_address_of 
	       (builtin_function ("_Jv_exception_info", 
				  build_function_type (ptr_type_node, endlink),
				  NOT_BUILT_IN, NULL_PTR)),
	     NULL_TREE, NULL_TREE);
  TREE_SIDE_EFFECTS (soft_exceptioninfo_call_node) = 1;
#if 0
  t = tree_cons (NULL_TREE, float_type_node,
		 tree_cons (NULL_TREE, float_type_node, endlink));
  soft_fmodf_node
    = builtin_function ("__builtin_fmodf",
			build_function_type (float_type_node, t),
			BUILT_IN_FMOD, "fmodf");
#endif
    
  init_class_processing ();
}


/* 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 (name)
     tree name;
{
  register 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 its the parameter level.  */

static tree
lookup_name_current_level (name)
     tree name;
{
  register 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 = TREE_CHAIN (t))
    if (DECL_NAME (t) == name)
      break;

  return t;
}

/* Use a binding level to record a labeled block declaration */

void
push_labeled_block (lb)
    tree lb;
{
  register tree name = DECL_NAME (LABELED_BLOCK_LABEL (lb));
  register struct binding_level *b = current_binding_level;
  tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
  if (oldlocal != 0)
      b->shadowed = tree_cons (name, oldlocal, b->shadowed);
  TREE_CHAIN (lb) = b->names;
  b->names = lb;
  IDENTIFIER_LOCAL_VALUE (name) = lb;
}

/* Pop the current binding level, reinstalling values for the previous
   labeled block */

void
pop_labeled_block ()
{
  struct binding_level *b = current_binding_level;
  tree label =  b->names;
  IDENTIFIER_LOCAL_VALUE (DECL_NAME (LABELED_BLOCK_LABEL (label))) = 
    NULL_TREE;
  if (b->shadowed)
    IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (b->shadowed)) = 
      TREE_VALUE (b->shadowed);

  /* Pop the current level, and free the structure for reuse.  */
  current_binding_level = current_binding_level->level_chain;
  b->level_chain = free_binding_level;
  free_binding_level = b;
}

/* 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 (x)
     tree x;
{
  register tree t;
  register tree name = DECL_NAME (x);
  register struct binding_level *b = current_binding_level;

  DECL_CONTEXT (x) = current_function_decl;
  if (name)
    {
      char *file;
      int line;

      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_with_decl (x, "`%s' used prior to declaration");
	}

      if (t != 0)
	{
	  file = DECL_SOURCE_FILE (t);
	  line = DECL_SOURCE_LINE (t);
	}

      /* 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 0
	  /* Warn if shadowing an argument at the top level of the body.  */
	  if (oldlocal != 0 && !DECL_EXTERNAL (x)
	      /* This warning doesn't apply to the parms of a nested fcn.  */
	      && ! current_binding_level->parm_flag
	      /* Check that this is one level down from the parms.  */
	      && current_binding_level->level_chain->parm_flag
	      /* Check that the decl being shadowed
		 comes from the parm level, one level up.  */
	      && chain_member (oldlocal, current_binding_level->level_chain->names))
	    {
	      if (TREE_CODE (oldlocal) == PARM_DECL)
		pedwarn ("declaration of `%s' shadows a parameter",
			 IDENTIFIER_POINTER (name));
	      else
		pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
			 IDENTIFIER_POINTER (name));
	    }

	  /* Maybe warn if shadowing something else.  */
	  else if (warn_shadow && !DECL_EXTERNAL (x)
		   /* No shadow warnings for internally generated vars.  */
		   && DECL_SOURCE_LINE (x) != 0
		   /* No shadow warnings for vars made for inlining.  */
		   && ! DECL_FROM_INLINE (x))
	    {
	      char *warnstring = 0;

	      if (TREE_CODE (x) == PARM_DECL
		  && current_binding_level->level_chain->parm_flag)
		/* Don't warn about the parm names in function declarator
		   within a function declarator.
		   It would be nice to avoid warning in any function
		   declarator in a declaration, as opposed to a definition,
		   but there is no way to tell it's not a definition.  */
		;
	      else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
		warnstring = "declaration of `%s' shadows a parameter";
	      else if (oldlocal != 0)
		warnstring = "declaration of `%s' shadows previous local";
	      else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
		       && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
		warnstring = "declaration of `%s' shadows global declaration";

	      if (warnstring)
		warning (warnstring, IDENTIFIER_POINTER (name));
	    }
#endif

	  /* 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.  */
  TREE_CHAIN (x) = b->names;
  b->names = x;

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

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

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

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

/* Nonzero if we are currently in the global binding level.  */

int
global_bindings_p ()
{
  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 ()
{
  return current_binding_level->names;
}

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

static
struct binding_level *
make_binding_level ()
{
  /* NOSTRICT */
  return (struct binding_level *) xmalloc (sizeof (struct binding_level));
}

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

#if 0
  /* If this is the top level of a function,
     just make sure that NAMED_LABELS is 0.  */

  if (current_binding_level == global_binding_level)
    named_labels = 0;
#endif

  /* 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;
  current_binding_level = newlevel;
  newlevel->keep = keep_next_level_flag;
  keep_next_level_flag = 0;
  newlevel->keep_if_subblocks = keep_next_if_subblocks;
  keep_next_if_subblocks = 0;
}

/* 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 (keep, reverse, functionbody)
     int keep;
     int reverse;
     int functionbody;
{
  register 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;
  int block_previously_created;

  keep |= current_binding_level->keep;

  /* 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;

  /* Output any nested inline functions within this block
     if they weren't already output.  */

  for (decl = decls; decl; decl = TREE_CHAIN (decl))
    if (TREE_CODE (decl) == FUNCTION_DECL
	&& ! TREE_ASM_WRITTEN (decl)
	&& DECL_INITIAL (decl) != 0
	&& TREE_ADDRESSABLE (decl))
      {
	/* If this decl was copied from a file-scope decl
	   on account of a block-scope extern decl,
	   propagate TREE_ADDRESSABLE to the file-scope decl.

	   DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
	   true, since then the decl goes through save_for_inline_copying.  */
	if (DECL_ABSTRACT_ORIGIN (decl) != 0
	    && DECL_ABSTRACT_ORIGIN (decl) != decl)
	  TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
	else
	  {
	    push_function_context ();
	    output_inline_function (decl);
	    pop_function_context ();
	  }
      }

  /* 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;
  block_previously_created = (current_binding_level->this_block != 0);
  if (block_previously_created)
    block = current_binding_level->this_block;
  else if (keep || functionbody
	   || (current_binding_level->keep_if_subblocks && subblocks != 0))
    block = make_node (BLOCK);
  if (block != 0)
    {
      BLOCK_VARS (block) = decls;
      BLOCK_TYPE_TAGS (block) = NULL_TREE;
      BLOCK_SUBBLOCKS (block) = subblocks;
      remember_end_note (block);
    }

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

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

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

  for (link = decls; link; link = TREE_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;

      /* Clear out the definitions of all label names,
	 since their scopes end here,
	 and add them to BLOCK_VARS.  */

#if 0
      for (link = named_labels; link; link = TREE_CHAIN (link))
	{
	  register tree label = TREE_VALUE (link);

	  if (DECL_INITIAL (label) == 0)
	    {
	      error_with_decl (label, "label `%s' used but not defined");
	      /* Avoid crashing later.  */
	      define_label (input_filename, lineno,
			    DECL_NAME (label));
	    }
	  else if (warn_unused && !TREE_USED (label))
	    warning_with_decl (label, "label `%s' defined but not used");
	  IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;

	  /* Put the labels into the "variables" of the
	     top-level block, so debugger can see them.  */
	  TREE_CHAIN (label) = BLOCK_VARS (block);
	  BLOCK_VARS (block) = label;
	}
#endif
    }

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

  {
    register 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;
  else if (block)
    {
      if (!block_previously_created)
        current_binding_level->blocks
          = 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
      = chainon (current_binding_level->blocks, subblocks);

  /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
     binding contour so that they point to the appropriate construct, i.e.
     either to the current FUNCTION_DECL node, or else to the BLOCK node
     we just constructed.

     Note that for tagged types whose scope is just the formal parameter
     list for some function type specification, we can't properly set
     their TYPE_CONTEXTs here, because we don't have a pointer to the
     appropriate FUNCTION_TYPE node readily available to us.  For those
     cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
     in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
     node which will represent the "scope" for these "parameter list local"
     tagged types.
  */

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

void
maybe_pushlevels (pc)
     int pc;
{
  while (pending_local_decls != NULL_TREE &&
	 DECL_LOCAL_START_PC (pending_local_decls) <= pc)
    {
      tree *ptr = &pending_local_decls;
      tree decl = *ptr;
      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 = &TREE_CHAIN (*ptr);
      pending_local_decls = *ptr;
      *ptr = NULL_TREE;

      /* Force non-nested range to be nested in current range. */
      if (end_pc > current_binding_level->end_pc)
	end_pc = current_binding_level->end_pc;

      pushlevel (1);
      expand_start_bindings (0);
      current_binding_level->end_pc = end_pc;
      
      current_binding_level->names = decl;
      for ( ; decl != NULL_TREE;  decl = TREE_CHAIN (decl))
	{
	  push_jvm_slot (DECL_LOCAL_SLOT_NUMBER (decl), decl);
	}
    }
}

void
maybe_poplevels (pc)
     int pc;
{
  while (current_binding_level->end_pc <= pc)
    {
      expand_end_bindings (getdecls (), 1, 0);
      poplevel (1, 0, 0);
    }
}

/* Insert BLOCK at the end of the list of subblocks of the
   current binding level.  This is used when a BIND_EXPR is expanded,
   to handle the BLOCK node inside the BIND_EXPR.  */

void
insert_block (block)
     tree block;
{
  TREE_USED (block) = 1;
  abort ();
  current_binding_level->blocks
    = chainon (current_binding_level->blocks, block);
}

/* Set the BLOCK node for the innermost scope
   (the one we are currently in).  */

void
set_block (block)
     register tree block;
{
  current_binding_level->this_block = block;
}

/* integrate_decl_tree calls this function. */

void
copy_lang_decl (node)
     tree node;
{
  int lang_decl_size
    = TREE_CODE (node) == VAR_DECL ? sizeof (struct lang_decl_var)
    : sizeof (struct lang_decl);
  struct lang_decl *x = (struct lang_decl *) oballoc (lang_decl_size);
  bcopy ((PTR) DECL_LANG_SPECIFIC (node), (PTR) x, lang_decl_size);
  DECL_LANG_SPECIFIC (node) = x;
}

/* If DECL has a cleanup, build and return that cleanup here.
   This is a callback called by expand_expr.  */

tree
maybe_build_cleanup (decl)
  tree decl ATTRIBUTE_UNUSED;
{
  /* There are no cleanups in Java (I think).  */
  return NULL_TREE;
}

void
give_name_to_locals (jcf)
     JCF *jcf;
{
  int i, n = DECL_LOCALVARIABLES_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;
	  DECL_ASSEMBLER_NAME (decl) = name;
	  if (TREE_CODE (decl) != PARM_DECL || TREE_TYPE (decl) != type)
	    warning ("bad type in parameter debug info");
	}
      else
	{
	  tree *ptr;
	  int end_pc = start_pc + length;
	  tree decl = build_decl (VAR_DECL, name, type);
	  if (end_pc > DECL_CODE_LENGTH (current_function_decl))
	    {
	      warning_with_decl (decl,
			 "bad PC range for debug info for local `%s'");
	      end_pc = DECL_CODE_LENGTH (current_function_decl);
	    }
	  DECL_LANG_SPECIFIC (decl)
	    = (struct lang_decl *) permalloc (sizeof (struct lang_decl_var));
	  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 = &TREE_CHAIN (*ptr);
	  TREE_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 = TREE_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);
	    }
	  DECL_ASSEMBLER_NAME (parm) = DECL_NAME (parm);
	}
    }
}

tree
build_result_decl (fndecl)
  tree fndecl;
{
  tree restype = TREE_TYPE (TREE_TYPE (fndecl));
  /* To be compatible with C_PROMOTING_INTEGER_TYPE_P in cc1/cc1plus. */
  if (INTEGRAL_TYPE_P (restype)
      && TYPE_PRECISION (restype) < TYPE_PRECISION (integer_type_node))
    restype = integer_type_node;
  return (DECL_RESULT (fndecl) = build_decl (RESULT_DECL, NULL_TREE, restype));
}

void
complete_start_java_method (fndecl)
  tree fndecl;
{
  if (! flag_emit_class_files)
    {
      /* Initialize the RTL code for the function.  */
      init_function_start (fndecl, input_filename, lineno);

      /* Set up parameters and prepare for return, for the function.  */
      expand_function_start (fndecl, 0);
    }

  /* Allocate further tree nodes temporarily during compilation
     of this function only.  */
  temporary_allocation ();

#if 0
      /* If this fcn was already referenced via a block-scope `extern' decl (or
         an implicit decl), propagate certain information about the usage. */
      if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
        TREE_ADDRESSABLE (current_function_decl) = 1;

#endif

  if (METHOD_STATIC (fndecl) && ! METHOD_PRIVATE (fndecl)
      && ! flag_emit_class_files
      && ! CLASS_INTERFACE (TYPE_NAME (current_class)))
    {
      tree clas = DECL_CONTEXT (fndecl);
      tree init = build (CALL_EXPR, void_type_node,
			 build_address_of (soft_initclass_node),
			 build_tree_list (NULL_TREE, build_class_ref (clas)),
			 NULL_TREE);
      TREE_SIDE_EFFECTS (init) = 1;
      expand_expr_stmt (init);
    }

  /* Push local variables. Function compiled from source code are
     using a different local variables management, and for them,
     pushlevel shouldn't be called from here.  */
  if (!CLASS_FROM_SOURCE_P (DECL_CONTEXT (fndecl)))
    {
      pushlevel (2);
      if (! flag_emit_class_files)
	expand_start_bindings (1);
    }

  if (METHOD_SYNCHRONIZED (fndecl) && ! flag_emit_class_files)
    {
      /* Warp function body with a monitorenter plus monitorexit cleanup. */
      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);
      if (!CLASS_FROM_SOURCE_P (DECL_CONTEXT (fndecl)))
	{
	  expand_expr_stmt (enter);
	  expand_decl_cleanup (NULL_TREE, exit);
	}
      else
	{
	  tree function_body = DECL_FUNCTION_BODY (fndecl);
	  tree body = BLOCK_EXPR_BODY (function_body);
	  lock = build (WITH_CLEANUP_EXPR, void_type_node,
			enter,  NULL_TREE, exit);
	  TREE_SIDE_EFFECTS (lock) = 1;
	  lock = build (COMPOUND_EXPR, TREE_TYPE (body), lock, body);
	  TREE_SIDE_EFFECTS (lock) = 1;
	  lock = build1 (CLEANUP_POINT_EXPR, TREE_TYPE (body), lock);
	  TREE_SIDE_EFFECTS (lock) = 1;
	  BLOCK_EXPR_BODY (function_body) = lock;
	}
    }
}

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

  current_function_decl = fndecl;
  announce_function (fndecl);

  i = DECL_MAX_LOCALS(fndecl) + DECL_MAX_STACK(fndecl);
  decl_map = make_tree_vec (i);
  type_map = (tree *) oballoc (i * sizeof (tree));

  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);
      if (i >= DECL_MAX_LOCALS(fndecl))
	fatal ("function has more parameters than local slots");

      parm_decl = build_decl (PARM_DECL, parm_name, parm_type);
      DECL_CONTEXT (parm_decl) = fndecl;
#ifdef PROMOTE_PROTOTYPES
      if (TYPE_PRECISION (parm_type) < TYPE_PRECISION (integer_type_node)
	  && INTEGRAL_TYPE_P (parm_type))
	parm_type = integer_type_node;
#endif
      DECL_ARG_TYPE (parm_decl) = parm_type;

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

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

      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);
  complete_start_java_method (fndecl);
}

void
end_java_method ()
{
  tree fndecl = current_function_decl;
  int flag_asynchronous_exceptions = asynchronous_exceptions;

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

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

  BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;

  emit_handlers ();

  /* Generate rtl for function exit.  */
  expand_function_end (input_filename, lineno, 0);

  /* FIXME: If the current method contains any exception handlers,
     force asynchronous_exceptions: this is necessary because signal
     handlers in libjava may throw exceptions.  This is far from being
     a perfect solution, but it's better than doing nothing at all.*/
  if (catch_clauses)
    asynchronous_exceptions = 1;

  /* Run the optimizers and output assembler code for this function. */
  rest_of_compilation (fndecl);

  current_function_decl = NULL_TREE;
  permanent_allocation (1);
  asynchronous_exceptions = flag_asynchronous_exceptions;
}