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gdb/mi/mi-cmd-stack.c

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/* Language-independent node constructors for parse phase of GNU compiler.
   Copyright (C) 1987-2015 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/>.  */

/* This file contains the low level primitives for operating on tree nodes,
   including allocation, list operations, interning of identifiers,
   construction of data type nodes and statement nodes,
   and construction of type conversion nodes.  It also contains
   tables index by tree code that describe how to take apart
   nodes of that code.

   It is intended to be language-independent but can occasionally
   calls language-dependent routines.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "tree.h"
#include "gimple.h"
#include "rtl.h"
#include "ssa.h"
#include "flags.h"
#include "alias.h"
#include "fold-const.h"
#include "stor-layout.h"
#include "calls.h"
#include "attribs.h"
#include "varasm.h"
#include "tm_p.h"
#include "toplev.h" /* get_random_seed */
#include "filenames.h"
#include "output.h"
#include "target.h"
#include "common/common-target.h"
#include "langhooks.h"
#include "tree-inline.h"
#include "tree-iterator.h"
#include "internal-fn.h"
#include "gimple-iterator.h"
#include "gimplify.h"
#include "cgraph.h"
#include "insn-config.h"
#include "expmed.h"
#include "dojump.h"
#include "explow.h"
#include "emit-rtl.h"
#include "stmt.h"
#include "expr.h"
#include "tree-dfa.h"
#include "params.h"
#include "tree-pass.h"
#include "langhooks-def.h"
#include "diagnostic.h"
#include "tree-diagnostic.h"
#include "tree-pretty-print.h"
#include "except.h"
#include "debug.h"
#include "intl.h"
#include "builtins.h"
#include "print-tree.h"
#include "ipa-utils.h"

/* Tree code classes.  */

#define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
#define END_OF_BASE_TREE_CODES tcc_exceptional,

const enum tree_code_class tree_code_type[] = {
#include "all-tree.def"
};

#undef DEFTREECODE
#undef END_OF_BASE_TREE_CODES

/* Table indexed by tree code giving number of expression
   operands beyond the fixed part of the node structure.
   Not used for types or decls.  */

#define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
#define END_OF_BASE_TREE_CODES 0,

const unsigned char tree_code_length[] = {
#include "all-tree.def"
};

#undef DEFTREECODE
#undef END_OF_BASE_TREE_CODES

/* Names of tree components.
   Used for printing out the tree and error messages.  */
#define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
#define END_OF_BASE_TREE_CODES "@dummy",

static const char *const tree_code_name[] = {
#include "all-tree.def"
};

#undef DEFTREECODE
#undef END_OF_BASE_TREE_CODES

/* Each tree code class has an associated string representation.
   These must correspond to the tree_code_class entries.  */

const char *const tree_code_class_strings[] =
{
  "exceptional",
  "constant",
  "type",
  "declaration",
  "reference",
  "comparison",
  "unary",
  "binary",
  "statement",
  "vl_exp",
  "expression"
};

/* obstack.[ch] explicitly declined to prototype this.  */
extern int _obstack_allocated_p (struct obstack *h, void *obj);

/* Statistics-gathering stuff.  */

static int tree_code_counts[MAX_TREE_CODES];
int tree_node_counts[(int) all_kinds];
int tree_node_sizes[(int) all_kinds];

/* Keep in sync with tree.h:enum tree_node_kind.  */
static const char * const tree_node_kind_names[] = {
  "decls",
  "types",
  "blocks",
  "stmts",
  "refs",
  "exprs",
  "constants",
  "identifiers",
  "vecs",
  "binfos",
  "ssa names",
  "constructors",
  "random kinds",
  "lang_decl kinds",
  "lang_type kinds",
  "omp clauses",
};

/* Unique id for next decl created.  */
static GTY(()) int next_decl_uid;
/* Unique id for next type created.  */
static GTY(()) int next_type_uid = 1;
/* Unique id for next debug decl created.  Use negative numbers,
   to catch erroneous uses.  */
static GTY(()) int next_debug_decl_uid;

/* Since we cannot rehash a type after it is in the table, we have to
   keep the hash code.  */

struct GTY((for_user)) type_hash {
  unsigned long hash;
  tree type;
};

/* Initial size of the hash table (rounded to next prime).  */
#define TYPE_HASH_INITIAL_SIZE 1000

struct type_cache_hasher : ggc_cache_ptr_hash<type_hash>
{
  static hashval_t hash (type_hash *t) { return t->hash; }
  static bool equal (type_hash *a, type_hash *b);

  static int
  keep_cache_entry (type_hash *&t)
  {
    return ggc_marked_p (t->type);
  }
};

/* Now here is the hash table.  When recording a type, it is added to
   the slot whose index is the hash code.  Note that the hash table is
   used for several kinds of types (function types, array types and
   array index range types, for now).  While all these live in the
   same table, they are completely independent, and the hash code is
   computed differently for each of these.  */

static GTY ((cache)) hash_table<type_cache_hasher> *type_hash_table;

/* Hash table and temporary node for larger integer const values.  */
static GTY (()) tree int_cst_node;

struct int_cst_hasher : ggc_cache_ptr_hash<tree_node>
{
  static hashval_t hash (tree t);
  static bool equal (tree x, tree y);
};

static GTY ((cache)) hash_table<int_cst_hasher> *int_cst_hash_table;

/* Hash table for optimization flags and target option flags.  Use the same
   hash table for both sets of options.  Nodes for building the current
   optimization and target option nodes.  The assumption is most of the time
   the options created will already be in the hash table, so we avoid
   allocating and freeing up a node repeatably.  */
static GTY (()) tree cl_optimization_node;
static GTY (()) tree cl_target_option_node;

struct cl_option_hasher : ggc_cache_ptr_hash<tree_node>
{
  static hashval_t hash (tree t);
  static bool equal (tree x, tree y);
};

static GTY ((cache)) hash_table<cl_option_hasher> *cl_option_hash_table;

/* General tree->tree mapping  structure for use in hash tables.  */


static GTY ((cache))
     hash_table<tree_decl_map_cache_hasher> *debug_expr_for_decl;

static GTY ((cache))
     hash_table<tree_decl_map_cache_hasher> *value_expr_for_decl;

struct tree_vec_map_cache_hasher : ggc_cache_ptr_hash<tree_vec_map>
{
  static hashval_t hash (tree_vec_map *m) { return DECL_UID (m->base.from); }

  static bool
  equal (tree_vec_map *a, tree_vec_map *b)
  {
    return a->base.from == b->base.from;
  }

  static int
  keep_cache_entry (tree_vec_map *&m)
  {
    return ggc_marked_p (m->base.from);
  }
};

static GTY ((cache))
     hash_table<tree_vec_map_cache_hasher> *debug_args_for_decl;

static void set_type_quals (tree, int);
static void print_type_hash_statistics (void);
static void print_debug_expr_statistics (void);
static void print_value_expr_statistics (void);
static void type_hash_list (const_tree, inchash::hash &);
static void attribute_hash_list (const_tree, inchash::hash &);

tree global_trees[TI_MAX];
tree integer_types[itk_none];

bool int_n_enabled_p[NUM_INT_N_ENTS];
struct int_n_trees_t int_n_trees [NUM_INT_N_ENTS];

unsigned char tree_contains_struct[MAX_TREE_CODES][64];

/* Number of operands for each OpenMP clause.  */
unsigned const char omp_clause_num_ops[] =
{
  0, /* OMP_CLAUSE_ERROR  */
  1, /* OMP_CLAUSE_PRIVATE  */
  1, /* OMP_CLAUSE_SHARED  */
  1, /* OMP_CLAUSE_FIRSTPRIVATE  */
  2, /* OMP_CLAUSE_LASTPRIVATE  */
  4, /* OMP_CLAUSE_REDUCTION  */
  1, /* OMP_CLAUSE_COPYIN  */
  1, /* OMP_CLAUSE_COPYPRIVATE  */
  3, /* OMP_CLAUSE_LINEAR  */
  2, /* OMP_CLAUSE_ALIGNED  */
  1, /* OMP_CLAUSE_DEPEND  */
  1, /* OMP_CLAUSE_UNIFORM  */
  2, /* OMP_CLAUSE_FROM  */
  2, /* OMP_CLAUSE_TO  */
  2, /* OMP_CLAUSE_MAP  */
  2, /* OMP_CLAUSE__CACHE_  */
  1, /* OMP_CLAUSE_DEVICE_RESIDENT  */
  1, /* OMP_CLAUSE_USE_DEVICE  */
  2, /* OMP_CLAUSE_GANG  */
  1, /* OMP_CLAUSE_ASYNC  */
  1, /* OMP_CLAUSE_WAIT  */
  0, /* OMP_CLAUSE_AUTO  */
  0, /* OMP_CLAUSE_SEQ  */
  1, /* OMP_CLAUSE__LOOPTEMP_  */
  1, /* OMP_CLAUSE_IF  */
  1, /* OMP_CLAUSE_NUM_THREADS  */
  1, /* OMP_CLAUSE_SCHEDULE  */
  0, /* OMP_CLAUSE_NOWAIT  */
  0, /* OMP_CLAUSE_ORDERED  */
  0, /* OMP_CLAUSE_DEFAULT  */
  3, /* OMP_CLAUSE_COLLAPSE  */
  0, /* OMP_CLAUSE_UNTIED   */
  1, /* OMP_CLAUSE_FINAL  */
  0, /* OMP_CLAUSE_MERGEABLE  */
  1, /* OMP_CLAUSE_DEVICE  */
  1, /* OMP_CLAUSE_DIST_SCHEDULE  */
  0, /* OMP_CLAUSE_INBRANCH  */
  0, /* OMP_CLAUSE_NOTINBRANCH  */
  1, /* OMP_CLAUSE_NUM_TEAMS  */
  1, /* OMP_CLAUSE_THREAD_LIMIT  */
  0, /* OMP_CLAUSE_PROC_BIND  */
  1, /* OMP_CLAUSE_SAFELEN  */
  1, /* OMP_CLAUSE_SIMDLEN  */
  0, /* OMP_CLAUSE_FOR  */
  0, /* OMP_CLAUSE_PARALLEL  */
  0, /* OMP_CLAUSE_SECTIONS  */
  0, /* OMP_CLAUSE_TASKGROUP  */
  1, /* OMP_CLAUSE__SIMDUID_  */
  1, /* OMP_CLAUSE__CILK_FOR_COUNT_  */
  0, /* OMP_CLAUSE_INDEPENDENT  */
  1, /* OMP_CLAUSE_WORKER  */
  1, /* OMP_CLAUSE_VECTOR  */
  1, /* OMP_CLAUSE_NUM_GANGS  */
  1, /* OMP_CLAUSE_NUM_WORKERS  */
  1, /* OMP_CLAUSE_VECTOR_LENGTH  */
};

const char * const omp_clause_code_name[] =
{
  "error_clause",
  "private",
  "shared",
  "firstprivate",
  "lastprivate",
  "reduction",
  "copyin",
  "copyprivate",
  "linear",
  "aligned",
  "depend",
  "uniform",
  "from",
  "to",
  "map",
  "_cache_",
  "device_resident",
  "use_device",
  "gang",
  "async",
  "wait",
  "auto",
  "seq",
  "_looptemp_",
  "if",
  "num_threads",
  "schedule",
  "nowait",
  "ordered",
  "default",
  "collapse",
  "untied",
  "final",
  "mergeable",
  "device",
  "dist_schedule",
  "inbranch",
  "notinbranch",
  "num_teams",
  "thread_limit",
  "proc_bind",
  "safelen",
  "simdlen",
  "for",
  "parallel",
  "sections",
  "taskgroup",
  "_simduid_",
  "_Cilk_for_count_",
  "independent",
  "worker",
  "vector",
  "num_gangs",
  "num_workers",
  "vector_length"
};


/* Return the tree node structure used by tree code CODE.  */

static inline enum tree_node_structure_enum
tree_node_structure_for_code (enum tree_code code)
{
  switch (TREE_CODE_CLASS (code))
    {
    case tcc_declaration:
      {
	switch (code)
	  {
	  case FIELD_DECL:
	    return TS_FIELD_DECL;
	  case PARM_DECL:
	    return TS_PARM_DECL;
	  case VAR_DECL:
	    return TS_VAR_DECL;
	  case LABEL_DECL:
	    return TS_LABEL_DECL;
	  case RESULT_DECL:
	    return TS_RESULT_DECL;
	  case DEBUG_EXPR_DECL:
	    return TS_DECL_WRTL;
	  case CONST_DECL:
	    return TS_CONST_DECL;
	  case TYPE_DECL:
	    return TS_TYPE_DECL;
	  case FUNCTION_DECL:
	    return TS_FUNCTION_DECL;
	  case TRANSLATION_UNIT_DECL:
	    return TS_TRANSLATION_UNIT_DECL;
	  default:
	    return TS_DECL_NON_COMMON;
	  }
      }
    case tcc_type:
      return TS_TYPE_NON_COMMON;
    case tcc_reference:
    case tcc_comparison:
    case tcc_unary:
    case tcc_binary:
    case tcc_expression:
    case tcc_statement:
    case tcc_vl_exp:
      return TS_EXP;
    default:  /* tcc_constant and tcc_exceptional */
      break;
    }
  switch (code)
    {
      /* tcc_constant cases.  */
    case VOID_CST:		return TS_TYPED;
    case INTEGER_CST:		return TS_INT_CST;
    case REAL_CST:		return TS_REAL_CST;
    case FIXED_CST:		return TS_FIXED_CST;
    case COMPLEX_CST:		return TS_COMPLEX;
    case VECTOR_CST:		return TS_VECTOR;
    case STRING_CST:		return TS_STRING;
      /* tcc_exceptional cases.  */
    case ERROR_MARK:		return TS_COMMON;
    case IDENTIFIER_NODE:	return TS_IDENTIFIER;
    case TREE_LIST:		return TS_LIST;
    case TREE_VEC:		return TS_VEC;
    case SSA_NAME:		return TS_SSA_NAME;
    case PLACEHOLDER_EXPR:	return TS_COMMON;
    case STATEMENT_LIST:	return TS_STATEMENT_LIST;
    case BLOCK:			return TS_BLOCK;
    case CONSTRUCTOR:		return TS_CONSTRUCTOR;
    case TREE_BINFO:		return TS_BINFO;
    case OMP_CLAUSE:		return TS_OMP_CLAUSE;
    case OPTIMIZATION_NODE:	return TS_OPTIMIZATION;
    case TARGET_OPTION_NODE:	return TS_TARGET_OPTION;

    default:
      gcc_unreachable ();
    }
}


/* Initialize tree_contains_struct to describe the hierarchy of tree
   nodes.  */

static void
initialize_tree_contains_struct (void)
{
  unsigned i;

  for (i = ERROR_MARK; i < LAST_AND_UNUSED_TREE_CODE; i++)
    {
      enum tree_code code;
      enum tree_node_structure_enum ts_code;

      code = (enum tree_code) i;
      ts_code = tree_node_structure_for_code (code);

      /* Mark the TS structure itself.  */
      tree_contains_struct[code][ts_code] = 1;

      /* Mark all the structures that TS is derived from.  */
      switch (ts_code)
	{
	case TS_TYPED:
	case TS_BLOCK:
	  MARK_TS_BASE (code);
	  break;

	case TS_COMMON:
	case TS_INT_CST:
	case TS_REAL_CST:
	case TS_FIXED_CST:
	case TS_VECTOR:
	case TS_STRING:
	case TS_COMPLEX:
	case TS_SSA_NAME:
	case TS_CONSTRUCTOR:
	case TS_EXP:
	case TS_STATEMENT_LIST:
	  MARK_TS_TYPED (code);
	  break;

	case TS_IDENTIFIER:
	case TS_DECL_MINIMAL:
	case TS_TYPE_COMMON:
	case TS_LIST:
	case TS_VEC:
	case TS_BINFO:
	case TS_OMP_CLAUSE:
	case TS_OPTIMIZATION:
	case TS_TARGET_OPTION:
	  MARK_TS_COMMON (code);
	  break;

	case TS_TYPE_WITH_LANG_SPECIFIC:
	  MARK_TS_TYPE_COMMON (code);
	  break;

	case TS_TYPE_NON_COMMON:
	  MARK_TS_TYPE_WITH_LANG_SPECIFIC (code);
	  break;

	case TS_DECL_COMMON:
	  MARK_TS_DECL_MINIMAL (code);
	  break;

	case TS_DECL_WRTL:
	case TS_CONST_DECL:
	  MARK_TS_DECL_COMMON (code);
	  break;

	case TS_DECL_NON_COMMON:
	  MARK_TS_DECL_WITH_VIS (code);
	  break;

	case TS_DECL_WITH_VIS:
	case TS_PARM_DECL:
	case TS_LABEL_DECL:
	case TS_RESULT_DECL:
	  MARK_TS_DECL_WRTL (code);
	  break;

	case TS_FIELD_DECL:
	  MARK_TS_DECL_COMMON (code);
	  break;

	case TS_VAR_DECL:
	  MARK_TS_DECL_WITH_VIS (code);
	  break;

	case TS_TYPE_DECL:
	case TS_FUNCTION_DECL:
	  MARK_TS_DECL_NON_COMMON (code);
	  break;

	case TS_TRANSLATION_UNIT_DECL:
	  MARK_TS_DECL_COMMON (code);
	  break;

	default:
	  gcc_unreachable ();
	}
    }

  /* Basic consistency checks for attributes used in fold.  */
  gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_NON_COMMON]);
  gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_NON_COMMON]);
  gcc_assert (tree_contains_struct[CONST_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[FIELD_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_WRTL]);
  gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_WRTL]);
  gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_WRTL]);
  gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_WRTL]);
  gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_WRTL]);
  gcc_assert (tree_contains_struct[CONST_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[FIELD_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_WITH_VIS]);
  gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_WITH_VIS]);
  gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_WITH_VIS]);
  gcc_assert (tree_contains_struct[VAR_DECL][TS_VAR_DECL]);
  gcc_assert (tree_contains_struct[FIELD_DECL][TS_FIELD_DECL]);
  gcc_assert (tree_contains_struct[PARM_DECL][TS_PARM_DECL]);
  gcc_assert (tree_contains_struct[LABEL_DECL][TS_LABEL_DECL]);
  gcc_assert (tree_contains_struct[RESULT_DECL][TS_RESULT_DECL]);
  gcc_assert (tree_contains_struct[CONST_DECL][TS_CONST_DECL]);
  gcc_assert (tree_contains_struct[TYPE_DECL][TS_TYPE_DECL]);
  gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_FUNCTION_DECL]);
  gcc_assert (tree_contains_struct[IMPORTED_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[IMPORTED_DECL][TS_DECL_COMMON]);
  gcc_assert (tree_contains_struct[NAMELIST_DECL][TS_DECL_MINIMAL]);
  gcc_assert (tree_contains_struct[NAMELIST_DECL][TS_DECL_COMMON]);
}


/* Init tree.c.  */

void
init_ttree (void)
{
  /* Initialize the hash table of types.  */
  type_hash_table
    = hash_table<type_cache_hasher>::create_ggc (TYPE_HASH_INITIAL_SIZE);

  debug_expr_for_decl
    = hash_table<tree_decl_map_cache_hasher>::create_ggc (512);

  value_expr_for_decl
    = hash_table<tree_decl_map_cache_hasher>::create_ggc (512);

  int_cst_hash_table = hash_table<int_cst_hasher>::create_ggc (1024);

  int_cst_node = make_int_cst (1, 1);

  cl_option_hash_table = hash_table<cl_option_hasher>::create_ggc (64);

  cl_optimization_node = make_node (OPTIMIZATION_NODE);
  cl_target_option_node = make_node (TARGET_OPTION_NODE);

  /* Initialize the tree_contains_struct array.  */
  initialize_tree_contains_struct ();
  lang_hooks.init_ts ();
}


/* The name of the object as the assembler will see it (but before any
   translations made by ASM_OUTPUT_LABELREF).  Often this is the same
   as DECL_NAME.  It is an IDENTIFIER_NODE.  */
tree
decl_assembler_name (tree decl)
{
  if (!DECL_ASSEMBLER_NAME_SET_P (decl))
    lang_hooks.set_decl_assembler_name (decl);
  return DECL_WITH_VIS_CHECK (decl)->decl_with_vis.assembler_name;
}

/* When the target supports COMDAT groups, this indicates which group the
   DECL is associated with.  This can be either an IDENTIFIER_NODE or a
   decl, in which case its DECL_ASSEMBLER_NAME identifies the group.  */
tree
decl_comdat_group (const_tree node)
{
  struct symtab_node *snode = symtab_node::get (node);
  if (!snode)
    return NULL;
  return snode->get_comdat_group ();
}

/* Likewise, but make sure it's been reduced to an IDENTIFIER_NODE.  */
tree
decl_comdat_group_id (const_tree node)
{
  struct symtab_node *snode = symtab_node::get (node);
  if (!snode)
    return NULL;
  return snode->get_comdat_group_id ();
}

/* When the target supports named section, return its name as IDENTIFIER_NODE
   or NULL if it is in no section.  */
const char *
decl_section_name (const_tree node)
{
  struct symtab_node *snode = symtab_node::get (node);
  if (!snode)
    return NULL;
  return snode->get_section ();
}

/* Set section name of NODE to VALUE (that is expected to be
   identifier node) */
void
set_decl_section_name (tree node, const char *value)
{
  struct symtab_node *snode;

  if (value == NULL)
    {
      snode = symtab_node::get (node);
      if (!snode)
	return;
    }
  else if (TREE_CODE (node) == VAR_DECL)
    snode = varpool_node::get_create (node);
  else
    snode = cgraph_node::get_create (node);
  snode->set_section (value);
}

/* Return TLS model of a variable NODE.  */
enum tls_model
decl_tls_model (const_tree node)
{
  struct varpool_node *snode = varpool_node::get (node);
  if (!snode)
    return TLS_MODEL_NONE;
  return snode->tls_model;
}

/* Set TLS model of variable NODE to MODEL.  */
void
set_decl_tls_model (tree node, enum tls_model model)
{
  struct varpool_node *vnode;

  if (model == TLS_MODEL_NONE)
    {
      vnode = varpool_node::get (node);
      if (!vnode)
	return;
    }
  else
    vnode = varpool_node::get_create (node);
  vnode->tls_model = model;
}

/* Compute the number of bytes occupied by a tree with code CODE.
   This function cannot be used for nodes that have variable sizes,
   including TREE_VEC, INTEGER_CST, STRING_CST, and CALL_EXPR.  */
size_t
tree_code_size (enum tree_code code)
{
  switch (TREE_CODE_CLASS (code))
    {
    case tcc_declaration:  /* A decl node */
      {
	switch (code)
	  {
	  case FIELD_DECL:
	    return sizeof (struct tree_field_decl);
	  case PARM_DECL:
	    return sizeof (struct tree_parm_decl);
	  case VAR_DECL:
	    return sizeof (struct tree_var_decl);
	  case LABEL_DECL:
	    return sizeof (struct tree_label_decl);
	  case RESULT_DECL:
	    return sizeof (struct tree_result_decl);
	  case CONST_DECL:
	    return sizeof (struct tree_const_decl);
	  case TYPE_DECL:
	    return sizeof (struct tree_type_decl);
	  case FUNCTION_DECL:
	    return sizeof (struct tree_function_decl);
	  case DEBUG_EXPR_DECL:
	    return sizeof (struct tree_decl_with_rtl);
	  case TRANSLATION_UNIT_DECL:
	    return sizeof (struct tree_translation_unit_decl);
	  case NAMESPACE_DECL:
	  case IMPORTED_DECL:
	  case NAMELIST_DECL:
	    return sizeof (struct tree_decl_non_common);
	  default:
	    return lang_hooks.tree_size (code);
	  }
      }

    case tcc_type:  /* a type node */
      return sizeof (struct tree_type_non_common);

    case tcc_reference:   /* a reference */
    case tcc_expression:  /* an expression */
    case tcc_statement:   /* an expression with side effects */
    case tcc_comparison:  /* a comparison expression */
    case tcc_unary:       /* a unary arithmetic expression */
    case tcc_binary:      /* a binary arithmetic expression */
      return (sizeof (struct tree_exp)
	      + (TREE_CODE_LENGTH (code) - 1) * sizeof (tree));

    case tcc_constant:  /* a constant */
      switch (code)
	{
	case VOID_CST:		return sizeof (struct tree_typed);
	case INTEGER_CST:	gcc_unreachable ();
	case REAL_CST:		return sizeof (struct tree_real_cst);
	case FIXED_CST:		return sizeof (struct tree_fixed_cst);
	case COMPLEX_CST:	return sizeof (struct tree_complex);
	case VECTOR_CST:	return sizeof (struct tree_vector);
	case STRING_CST:	gcc_unreachable ();
	default:
	  return lang_hooks.tree_size (code);
	}

    case tcc_exceptional:  /* something random, like an identifier.  */
      switch (code)
	{
	case IDENTIFIER_NODE:	return lang_hooks.identifier_size;
	case TREE_LIST:		return sizeof (struct tree_list);

	case ERROR_MARK:
	case PLACEHOLDER_EXPR:	return sizeof (struct tree_common);

	case TREE_VEC:
	case OMP_CLAUSE:	gcc_unreachable ();

	case SSA_NAME:		return sizeof (struct tree_ssa_name);

	case STATEMENT_LIST:	return sizeof (struct tree_statement_list);
	case BLOCK:		return sizeof (struct tree_block);
	case CONSTRUCTOR:	return sizeof (struct tree_constructor);
	case OPTIMIZATION_NODE: return sizeof (struct tree_optimization_option);
	case TARGET_OPTION_NODE: return sizeof (struct tree_target_option);

	default:
	  return lang_hooks.tree_size (code);
	}

    default:
      gcc_unreachable ();
    }
}

/* Compute the number of bytes occupied by NODE.  This routine only
   looks at TREE_CODE, except for those nodes that have variable sizes.  */
size_t
tree_size (const_tree node)
{
  const enum tree_code code = TREE_CODE (node);
  switch (code)
    {
    case INTEGER_CST:
      return (sizeof (struct tree_int_cst)
	      + (TREE_INT_CST_EXT_NUNITS (node) - 1) * sizeof (HOST_WIDE_INT));

    case TREE_BINFO:
      return (offsetof (struct tree_binfo, base_binfos)
	      + vec<tree, va_gc>
		  ::embedded_size (BINFO_N_BASE_BINFOS (node)));

    case TREE_VEC:
      return (sizeof (struct tree_vec)
	      + (TREE_VEC_LENGTH (node) - 1) * sizeof (tree));

    case VECTOR_CST:
      return (sizeof (struct tree_vector)
	      + (TYPE_VECTOR_SUBPARTS (TREE_TYPE (node)) - 1) * sizeof (tree));

    case STRING_CST:
      return TREE_STRING_LENGTH (node) + offsetof (struct tree_string, str) + 1;

    case OMP_CLAUSE:
      return (sizeof (struct tree_omp_clause)
	      + (omp_clause_num_ops[OMP_CLAUSE_CODE (node)] - 1)
	        * sizeof (tree));

    default:
      if (TREE_CODE_CLASS (code) == tcc_vl_exp)
	return (sizeof (struct tree_exp)
		+ (VL_EXP_OPERAND_LENGTH (node) - 1) * sizeof (tree));
      else
	return tree_code_size (code);
    }
}

/* Record interesting allocation statistics for a tree node with CODE
   and LENGTH.  */

static void
record_node_allocation_statistics (enum tree_code code ATTRIBUTE_UNUSED,
				   size_t length ATTRIBUTE_UNUSED)
{
  enum tree_code_class type = TREE_CODE_CLASS (code);
  tree_node_kind kind;

  if (!GATHER_STATISTICS)
    return;

  switch (type)
    {
    case tcc_declaration:  /* A decl node */
      kind = d_kind;
      break;

    case tcc_type:  /* a type node */
      kind = t_kind;
      break;

    case tcc_statement:  /* an expression with side effects */
      kind = s_kind;
      break;

    case tcc_reference:  /* a reference */
      kind = r_kind;
      break;

    case tcc_expression:  /* an expression */
    case tcc_comparison:  /* a comparison expression */
    case tcc_unary:  /* a unary arithmetic expression */
    case tcc_binary:  /* a binary arithmetic expression */
      kind = e_kind;
      break;

    case tcc_constant:  /* a constant */
      kind = c_kind;
      break;

    case tcc_exceptional:  /* something random, like an identifier.  */
      switch (code)
	{
	case IDENTIFIER_NODE:
	  kind = id_kind;
	  break;

	case TREE_VEC:
	  kind = vec_kind;
	  break;

	case TREE_BINFO:
	  kind = binfo_kind;
	  break;

	case SSA_NAME:
	  kind = ssa_name_kind;
	  break;

	case BLOCK:
	  kind = b_kind;
	  break;

	case CONSTRUCTOR:
	  kind = constr_kind;
	  break;

	case OMP_CLAUSE:
	  kind = omp_clause_kind;
	  break;

	default:
	  kind = x_kind;
	  break;
	}
      break;

    case tcc_vl_exp:
      kind = e_kind;
      break;

    default:
      gcc_unreachable ();
    }

  tree_code_counts[(int) code]++;
  tree_node_counts[(int) kind]++;
  tree_node_sizes[(int) kind] += length;
}

/* Allocate and return a new UID from the DECL_UID namespace.  */

int
allocate_decl_uid (void)
{
  return next_decl_uid++;
}

/* Return a newly allocated node of code CODE.  For decl and type
   nodes, some other fields are initialized.  The rest of the node is
   initialized to zero.  This function cannot be used for TREE_VEC,
   INTEGER_CST or OMP_CLAUSE nodes, which is enforced by asserts in
   tree_code_size.

   Achoo!  I got a code in the node.  */

tree
make_node_stat (enum tree_code code MEM_STAT_DECL)
{
  tree t;
  enum tree_code_class type = TREE_CODE_CLASS (code);
  size_t length = tree_code_size (code);

  record_node_allocation_statistics (code, length);

  t = ggc_alloc_cleared_tree_node_stat (length PASS_MEM_STAT);
  TREE_SET_CODE (t, code);

  switch (type)
    {
    case tcc_statement:
      TREE_SIDE_EFFECTS (t) = 1;
      break;

    case tcc_declaration:
      if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
	{
	  if (code == FUNCTION_DECL)
	    {
	      DECL_ALIGN (t) = FUNCTION_BOUNDARY;
	      DECL_MODE (t) = FUNCTION_MODE;
	    }
	  else
	    DECL_ALIGN (t) = 1;
	}
      DECL_SOURCE_LOCATION (t) = input_location;
      if (TREE_CODE (t) == DEBUG_EXPR_DECL)
	DECL_UID (t) = --next_debug_decl_uid;
      else
	{
	  DECL_UID (t) = allocate_decl_uid ();
	  SET_DECL_PT_UID (t, -1);
	}
      if (TREE_CODE (t) == LABEL_DECL)
	LABEL_DECL_UID (t) = -1;

      break;

    case tcc_type:
      TYPE_UID (t) = next_type_uid++;
      TYPE_ALIGN (t) = BITS_PER_UNIT;
      TYPE_USER_ALIGN (t) = 0;
      TYPE_MAIN_VARIANT (t) = t;
      TYPE_CANONICAL (t) = t;

      /* Default to no attributes for type, but let target change that.  */
      TYPE_ATTRIBUTES (t) = NULL_TREE;
      targetm.set_default_type_attributes (t);

      /* We have not yet computed the alias set for this type.  */
      TYPE_ALIAS_SET (t) = -1;
      break;

    case tcc_constant:
      TREE_CONSTANT (t) = 1;
      break;

    case tcc_expression:
      switch (code)
	{
	case INIT_EXPR:
	case MODIFY_EXPR:
	case VA_ARG_EXPR:
	case PREDECREMENT_EXPR:
	case PREINCREMENT_EXPR:
	case POSTDECREMENT_EXPR:
	case POSTINCREMENT_EXPR:
	  /* All of these have side-effects, no matter what their
	     operands are.  */
	  TREE_SIDE_EFFECTS (t) = 1;
	  break;

	default:
	  break;
	}
      break;

    case tcc_exceptional:
      switch (code)
        {
	case TARGET_OPTION_NODE:
	  TREE_TARGET_OPTION(t)
			    = ggc_cleared_alloc<struct cl_target_option> ();
	  break;

	case OPTIMIZATION_NODE:
	  TREE_OPTIMIZATION (t)
			    = ggc_cleared_alloc<struct cl_optimization> ();
	  break;

	default:
	  break;
	}
      break;

    default:
      /* Other classes need no special treatment.  */
      break;
    }

  return t;
}

/* Return a new node with the same contents as NODE except that its
   TREE_CHAIN, if it has one, is zero and it has a fresh uid.  */

tree
copy_node_stat (tree node MEM_STAT_DECL)
{
  tree t;
  enum tree_code code = TREE_CODE (node);
  size_t length;

  gcc_assert (code != STATEMENT_LIST);

  length = tree_size (node);
  record_node_allocation_statistics (code, length);
  t = ggc_alloc_tree_node_stat (length PASS_MEM_STAT);
  memcpy (t, node, length);

  if (CODE_CONTAINS_STRUCT (code, TS_COMMON))
    TREE_CHAIN (t) = 0;
  TREE_ASM_WRITTEN (t) = 0;
  TREE_VISITED (t) = 0;

  if (TREE_CODE_CLASS (code) == tcc_declaration)
    {
      if (code == DEBUG_EXPR_DECL)
	DECL_UID (t) = --next_debug_decl_uid;
      else
	{
	  DECL_UID (t) = allocate_decl_uid ();
	  if (DECL_PT_UID_SET_P (node))
	    SET_DECL_PT_UID (t, DECL_PT_UID (node));
	}
      if ((TREE_CODE (node) == PARM_DECL || TREE_CODE (node) == VAR_DECL)
	  && DECL_HAS_VALUE_EXPR_P (node))
	{
	  SET_DECL_VALUE_EXPR (t, DECL_VALUE_EXPR (node));
	  DECL_HAS_VALUE_EXPR_P (t) = 1;
	}
      /* DECL_DEBUG_EXPR is copied explicitely by callers.  */
      if (TREE_CODE (node) == VAR_DECL)
	{
	  DECL_HAS_DEBUG_EXPR_P (t) = 0;
	  t->decl_with_vis.symtab_node = NULL;
	}
      if (TREE_CODE (node) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (node))
	{
	  SET_DECL_INIT_PRIORITY (t, DECL_INIT_PRIORITY (node));
	  DECL_HAS_INIT_PRIORITY_P (t) = 1;
	}
      if (TREE_CODE (node) == FUNCTION_DECL)
	{
	  DECL_STRUCT_FUNCTION (t) = NULL;
	  t->decl_with_vis.symtab_node = NULL;
	}
    }
  else if (TREE_CODE_CLASS (code) == tcc_type)
    {
      TYPE_UID (t) = next_type_uid++;
      /* The following is so that the debug code for
	 the copy is different from the original type.
	 The two statements usually duplicate each other
	 (because they clear fields of the same union),
	 but the optimizer should catch that.  */
      TYPE_SYMTAB_POINTER (t) = 0;
      TYPE_SYMTAB_ADDRESS (t) = 0;

      /* Do not copy the values cache.  */
      if (TYPE_CACHED_VALUES_P (t))
	{
	  TYPE_CACHED_VALUES_P (t) = 0;
	  TYPE_CACHED_VALUES (t) = NULL_TREE;
	}
    }
    else if (code == TARGET_OPTION_NODE)
      {
	TREE_TARGET_OPTION (t) = ggc_alloc<struct cl_target_option>();
	memcpy (TREE_TARGET_OPTION (t), TREE_TARGET_OPTION (node),
		sizeof (struct cl_target_option));
      }
    else if (code == OPTIMIZATION_NODE)
      {
	TREE_OPTIMIZATION (t) = ggc_alloc<struct cl_optimization>();
	memcpy (TREE_OPTIMIZATION (t), TREE_OPTIMIZATION (node),
		sizeof (struct cl_optimization));
      }

  return t;
}

/* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
   For example, this can copy a list made of TREE_LIST nodes.  */

tree
copy_list (tree list)
{
  tree head;
  tree prev, next;

  if (list == 0)
    return 0;

  head = prev = copy_node (list);
  next = TREE_CHAIN (list);
  while (next)
    {
      TREE_CHAIN (prev) = copy_node (next);
      prev = TREE_CHAIN (prev);
      next = TREE_CHAIN (next);
    }
  return head;
}


/* Return the value that TREE_INT_CST_EXT_NUNITS should have for an
   INTEGER_CST with value CST and type TYPE.   */

static unsigned int
get_int_cst_ext_nunits (tree type, const wide_int &cst)
{
  gcc_checking_assert (cst.get_precision () == TYPE_PRECISION (type));
  /* We need an extra zero HWI if CST is an unsigned integer with its
     upper bit set, and if CST occupies a whole number of HWIs.  */
  if (TYPE_UNSIGNED (type)
      && wi::neg_p (cst)
      && (cst.get_precision () % HOST_BITS_PER_WIDE_INT) == 0)
    return cst.get_precision () / HOST_BITS_PER_WIDE_INT + 1;
  return cst.get_len ();
}

/* Return a new INTEGER_CST with value CST and type TYPE.  */

static tree
build_new_int_cst (tree type, const wide_int &cst)
{
  unsigned int len = cst.get_len ();
  unsigned int ext_len = get_int_cst_ext_nunits (type, cst);
  tree nt = make_int_cst (len, ext_len);

  if (len < ext_len)
    {
      --ext_len;
      TREE_INT_CST_ELT (nt, ext_len) = 0;
      for (unsigned int i = len; i < ext_len; ++i)
	TREE_INT_CST_ELT (nt, i) = -1;
    }
  else if (TYPE_UNSIGNED (type)
	   && cst.get_precision () < len * HOST_BITS_PER_WIDE_INT)
    {
      len--;
      TREE_INT_CST_ELT (nt, len)
	= zext_hwi (cst.elt (len),
		    cst.get_precision () % HOST_BITS_PER_WIDE_INT);
    }

  for (unsigned int i = 0; i < len; i++)
    TREE_INT_CST_ELT (nt, i) = cst.elt (i);
  TREE_TYPE (nt) = type;
  return nt;
}

/* Create an INT_CST node with a LOW value sign extended to TYPE.  */

tree
build_int_cst (tree type, HOST_WIDE_INT low)
{
  /* Support legacy code.  */
  if (!type)
    type = integer_type_node;

  return wide_int_to_tree (type, wi::shwi (low, TYPE_PRECISION (type)));
}

tree
build_int_cstu (tree type, unsigned HOST_WIDE_INT cst)
{
  return wide_int_to_tree (type, wi::uhwi (cst, TYPE_PRECISION (type)));
}

/* Create an INT_CST node with a LOW value sign extended to TYPE.  */

tree
build_int_cst_type (tree type, HOST_WIDE_INT low)
{
  gcc_assert (type);
  return wide_int_to_tree (type, wi::shwi (low, TYPE_PRECISION (type)));
}

/* Constructs tree in type TYPE from with value given by CST.  Signedness
   of CST is assumed to be the same as the signedness of TYPE.  */

tree
double_int_to_tree (tree type, double_int cst)
{
  return wide_int_to_tree (type, widest_int::from (cst, TYPE_SIGN (type)));
}

/* We force the wide_int CST to the range of the type TYPE by sign or
   zero extending it.  OVERFLOWABLE indicates if we are interested in
   overflow of the value, when >0 we are only interested in signed
   overflow, for <0 we are interested in any overflow.  OVERFLOWED
   indicates whether overflow has already occurred.  CONST_OVERFLOWED
   indicates whether constant overflow has already occurred.  We force
   T's value to be within range of T's type (by setting to 0 or 1 all
   the bits outside the type's range).  We set TREE_OVERFLOWED if,
        OVERFLOWED is nonzero,
        or OVERFLOWABLE is >0 and signed overflow occurs
        or OVERFLOWABLE is <0 and any overflow occurs
   We return a new tree node for the extended wide_int.  The node
   is shared if no overflow flags are set.  */


tree
force_fit_type (tree type, const wide_int_ref &cst,
		int overflowable, bool overflowed)
{
  signop sign = TYPE_SIGN (type);

  /* If we need to set overflow flags, return a new unshared node.  */
  if (overflowed || !wi::fits_to_tree_p (cst, type))
    {
      if (overflowed
	  || overflowable < 0
	  || (overflowable > 0 && sign == SIGNED))
	{
	  wide_int tmp = wide_int::from (cst, TYPE_PRECISION (type), sign);
	  tree t = build_new_int_cst (type, tmp);
	  TREE_OVERFLOW (t) = 1;
	  return t;
	}
    }

  /* Else build a shared node.  */
  return wide_int_to_tree (type, cst);
}

/* These are the hash table functions for the hash table of INTEGER_CST
   nodes of a sizetype.  */

/* Return the hash code X, an INTEGER_CST.  */

hashval_t
int_cst_hasher::hash (tree x)
{
  const_tree const t = x;
  hashval_t code = TYPE_UID (TREE_TYPE (t));
  int i;

  for (i = 0; i < TREE_INT_CST_NUNITS (t); i++)
    code ^= TREE_INT_CST_ELT (t, i);

  return code;
}

/* Return nonzero if the value represented by *X (an INTEGER_CST tree node)
   is the same as that given by *Y, which is the same.  */

bool
int_cst_hasher::equal (tree x, tree y)
{
  const_tree const xt = x;
  const_tree const yt = y;

  if (TREE_TYPE (xt) != TREE_TYPE (yt)
      || TREE_INT_CST_NUNITS (xt) != TREE_INT_CST_NUNITS (yt)
      || TREE_INT_CST_EXT_NUNITS (xt) != TREE_INT_CST_EXT_NUNITS (yt))
    return false;

  for (int i = 0; i < TREE_INT_CST_NUNITS (xt); i++)
    if (TREE_INT_CST_ELT (xt, i) != TREE_INT_CST_ELT (yt, i))
      return false;

  return true;
}

/* Create an INT_CST node of TYPE and value CST.
   The returned node is always shared.  For small integers we use a
   per-type vector cache, for larger ones we use a single hash table.
   The value is extended from its precision according to the sign of
   the type to be a multiple of HOST_BITS_PER_WIDE_INT.  This defines
   the upper bits and ensures that hashing and value equality based
   upon the underlying HOST_WIDE_INTs works without masking.  */

tree
wide_int_to_tree (tree type, const wide_int_ref &pcst)
{
  tree t;
  int ix = -1;
  int limit = 0;

  gcc_assert (type);
  unsigned int prec = TYPE_PRECISION (type);
  signop sgn = TYPE_SIGN (type);

  /* Verify that everything is canonical.  */
  int l = pcst.get_len ();
  if (l > 1)
    {
      if (pcst.elt (l - 1) == 0)
	gcc_checking_assert (pcst.elt (l - 2) < 0);
      if (pcst.elt (l - 1) == (HOST_WIDE_INT) -1)
	gcc_checking_assert (pcst.elt (l - 2) >= 0);
    }

  wide_int cst = wide_int::from (pcst, prec, sgn);
  unsigned int ext_len = get_int_cst_ext_nunits (type, cst);

  if (ext_len == 1)
    {
      /* We just need to store a single HOST_WIDE_INT.  */
      HOST_WIDE_INT hwi;
      if (TYPE_UNSIGNED (type))
	hwi = cst.to_uhwi ();
      else
	hwi = cst.to_shwi ();

      switch (TREE_CODE (type))
	{
	case NULLPTR_TYPE:
	  gcc_assert (hwi == 0);
	  /* Fallthru.  */

	case POINTER_TYPE:
	case REFERENCE_TYPE:
	case POINTER_BOUNDS_TYPE:
	  /* Cache NULL pointer and zero bounds.  */
	  if (hwi == 0)
	    {
	      limit = 1;
	      ix = 0;
	    }
	  break;

	case BOOLEAN_TYPE:
	  /* Cache false or true.  */
	  limit = 2;
	  if (hwi < 2)
	    ix = hwi;
	  break;

	case INTEGER_TYPE:
	case OFFSET_TYPE:
	  if (TYPE_SIGN (type) == UNSIGNED)
	    {
	      /* Cache [0, N).  */
	      limit = INTEGER_SHARE_LIMIT;
	      if (IN_RANGE (hwi, 0, INTEGER_SHARE_LIMIT - 1))
		ix = hwi;
	    }
	  else
	    {
	      /* Cache [-1, N).  */
	      limit = INTEGER_SHARE_LIMIT + 1;
	      if (IN_RANGE (hwi, -1, INTEGER_SHARE_LIMIT - 1))
		ix = hwi + 1;
	    }
	  break;

	case ENUMERAL_TYPE:
	  break;

	default:
	  gcc_unreachable ();
	}

      if (ix >= 0)
	{
	  /* Look for it in the type's vector of small shared ints.  */
	  if (!TYPE_CACHED_VALUES_P (type))
	    {
	      TYPE_CACHED_VALUES_P (type) = 1;
	      TYPE_CACHED_VALUES (type) = make_tree_vec (limit);
	    }

	  t = TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix);
	  if (t)
	    /* Make sure no one is clobbering the shared constant.  */
	    gcc_checking_assert (TREE_TYPE (t) == type
				 && TREE_INT_CST_NUNITS (t) == 1
				 && TREE_INT_CST_OFFSET_NUNITS (t) == 1
				 && TREE_INT_CST_EXT_NUNITS (t) == 1
				 && TREE_INT_CST_ELT (t, 0) == hwi);
	  else
	    {
	      /* Create a new shared int.  */
	      t = build_new_int_cst (type, cst);
	      TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix) = t;
	    }
	}
      else
	{
	  /* Use the cache of larger shared ints, using int_cst_node as
	     a temporary.  */

	  TREE_INT_CST_ELT (int_cst_node, 0) = hwi;
	  TREE_TYPE (int_cst_node) = type;

	  tree *slot = int_cst_hash_table->find_slot (int_cst_node, INSERT);
	  t = *slot;
	  if (!t)
	    {
	      /* Insert this one into the hash table.  */
	      t = int_cst_node;
	      *slot = t;
	      /* Make a new node for next time round.  */
	      int_cst_node = make_int_cst (1, 1);
	    }
	}
    }
  else
    {
      /* The value either hashes properly or we drop it on the floor
	 for the gc to take care of.  There will not be enough of them
	 to worry about.  */

      tree nt = build_new_int_cst (type, cst);
      tree *slot = int_cst_hash_table->find_slot (nt, INSERT);
      t = *slot;
      if (!t)
	{
	  /* Insert this one into the hash table.  */
	  t = nt;
	  *slot = t;
	}
    }

  return t;
}

void
cache_integer_cst (tree t)
{
  tree type = TREE_TYPE (t);
  int ix = -1;
  int limit = 0;
  int prec = TYPE_PRECISION (type);

  gcc_assert (!TREE_OVERFLOW (t));

  switch (TREE_CODE (type))
    {
    case NULLPTR_TYPE:
      gcc_assert (integer_zerop (t));
      /* Fallthru.  */

    case POINTER_TYPE:
    case REFERENCE_TYPE:
      /* Cache NULL pointer.  */
      if (integer_zerop (t))
	{
	  limit = 1;
	  ix = 0;
	}
      break;

    case BOOLEAN_TYPE:
      /* Cache false or true.  */
      limit = 2;
      if (wi::ltu_p (t, 2))
	ix = TREE_INT_CST_ELT (t, 0);
      break;

    case INTEGER_TYPE:
    case OFFSET_TYPE:
      if (TYPE_UNSIGNED (type))
	{
	  /* Cache 0..N */
	  limit = INTEGER_SHARE_LIMIT;

	  /* This is a little hokie, but if the prec is smaller than
	     what is necessary to hold INTEGER_SHARE_LIMIT, then the
	     obvious test will not get the correct answer.  */
	  if (prec < HOST_BITS_PER_WIDE_INT)
	    {
	      if (tree_to_uhwi (t) < (unsigned HOST_WIDE_INT) INTEGER_SHARE_LIMIT)
		ix = tree_to_uhwi (t);
	    }
	  else if (wi::ltu_p (t, INTEGER_SHARE_LIMIT))
	    ix = tree_to_uhwi (t);
	}
      else
	{
	  /* Cache -1..N */
	  limit = INTEGER_SHARE_LIMIT + 1;

	  if (integer_minus_onep (t))
	    ix = 0;
	  else if (!wi::neg_p (t))
	    {
	      if (prec < HOST_BITS_PER_WIDE_INT)
		{
		  if (tree_to_shwi (t) < INTEGER_SHARE_LIMIT)
		    ix = tree_to_shwi (t) + 1;
		}
	      else if (wi::ltu_p (t, INTEGER_SHARE_LIMIT))
		ix = tree_to_shwi (t) + 1;
	    }
	}
      break;

    case ENUMERAL_TYPE:
      break;

    default:
      gcc_unreachable ();
    }

  if (ix >= 0)
    {
      /* Look for it in the type's vector of small shared ints.  */
      if (!TYPE_CACHED_VALUES_P (type))
	{
	  TYPE_CACHED_VALUES_P (type) = 1;
	  TYPE_CACHED_VALUES (type) = make_tree_vec (limit);
	}

      gcc_assert (TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix) == NULL_TREE);
      TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix) = t;
    }
  else
    {
      /* Use the cache of larger shared ints.  */
      tree *slot = int_cst_hash_table->find_slot (t, INSERT);
      /* If there is already an entry for the number verify it's the
         same.  */
      if (*slot)
	gcc_assert (wi::eq_p (tree (*slot), t));
      else
	/* Otherwise insert this one into the hash table.  */
	*slot = t;
    }
}


/* Builds an integer constant in TYPE such that lowest BITS bits are ones
   and the rest are zeros.  */

tree
build_low_bits_mask (tree type, unsigned bits)
{
  gcc_assert (bits <= TYPE_PRECISION (type));

  return wide_int_to_tree (type, wi::mask (bits, false,
					   TYPE_PRECISION (type)));
}

/* Checks that X is integer constant that can be expressed in (unsigned)
   HOST_WIDE_INT without loss of precision.  */

bool
cst_and_fits_in_hwi (const_tree x)
{
  if (TREE_CODE (x) != INTEGER_CST)
    return false;

  if (TYPE_PRECISION (TREE_TYPE (x)) > HOST_BITS_PER_WIDE_INT)
    return false;

  return TREE_INT_CST_NUNITS (x) == 1;
}

/* Build a newly constructed VECTOR_CST node of length LEN.  */

tree
make_vector_stat (unsigned len MEM_STAT_DECL)
{
  tree t;
  unsigned length = (len - 1) * sizeof (tree) + sizeof (struct tree_vector);

  record_node_allocation_statistics (VECTOR_CST, length);

  t = ggc_alloc_cleared_tree_node_stat (length PASS_MEM_STAT);

  TREE_SET_CODE (t, VECTOR_CST);
  TREE_CONSTANT (t) = 1;

  return t;
}

/* Return a new VECTOR_CST node whose type is TYPE and whose values
   are in a list pointed to by VALS.  */

tree
build_vector_stat (tree type, tree *vals MEM_STAT_DECL)
{
  int over = 0;
  unsigned cnt = 0;
  tree v = make_vector (TYPE_VECTOR_SUBPARTS (type));
  TREE_TYPE (v) = type;

  /* Iterate through elements and check for overflow.  */
  for (cnt = 0; cnt < TYPE_VECTOR_SUBPARTS (type); ++cnt)
    {
      tree value = vals[cnt];

      VECTOR_CST_ELT (v, cnt) = value;

      /* Don't crash if we get an address constant.  */
      if (!CONSTANT_CLASS_P (value))
	continue;

      over |= TREE_OVERFLOW (value);
    }

  TREE_OVERFLOW (v) = over;
  return v;
}

/* Return a new VECTOR_CST node whose type is TYPE and whose values
   are extracted from V, a vector of CONSTRUCTOR_ELT.  */

tree
build_vector_from_ctor (tree type, vec<constructor_elt, va_gc> *v)
{
  tree *vec = XALLOCAVEC (tree, TYPE_VECTOR_SUBPARTS (type));
  unsigned HOST_WIDE_INT idx;
  tree value;

  FOR_EACH_CONSTRUCTOR_VALUE (v, idx, value)
    vec[idx] = value;
  for (; idx < TYPE_VECTOR_SUBPARTS (type); ++idx)
    vec[idx] = build_zero_cst (TREE_TYPE (type));

  return build_vector (type, vec);
}

/* Build a vector of type VECTYPE where all the elements are SCs.  */
tree
build_vector_from_val (tree vectype, tree sc) 
{
  int i, nunits = TYPE_VECTOR_SUBPARTS (vectype);

  if (sc == error_mark_node)
    return sc;

  /* Verify that the vector type is suitable for SC.  Note that there
     is some inconsistency in the type-system with respect to restrict
     qualifications of pointers.  Vector types always have a main-variant
     element type and the qualification is applied to the vector-type.
     So TREE_TYPE (vector-type) does not return a properly qualified
     vector element-type.  */
  gcc_checking_assert (types_compatible_p (TYPE_MAIN_VARIANT (TREE_TYPE (sc)),
					   TREE_TYPE (vectype)));

  if (CONSTANT_CLASS_P (sc))
    {
      tree *v = XALLOCAVEC (tree, nunits);
      for (i = 0; i < nunits; ++i)
	v[i] = sc;
      return build_vector (vectype, v);
    }
  else
    {
      vec<constructor_elt, va_gc> *v;
      vec_alloc (v, nunits);
      for (i = 0; i < nunits; ++i)
	CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, sc);
      return build_constructor (vectype, v);
    }
}

/* Return a new CONSTRUCTOR node whose type is TYPE and whose values
   are in the vec pointed to by VALS.  */
tree
build_constructor (tree type, vec<constructor_elt, va_gc> *vals)
{
  tree c = make_node (CONSTRUCTOR);
  unsigned int i;
  constructor_elt *elt;
  bool constant_p = true;
  bool side_effects_p = false;

  TREE_TYPE (c) = type;
  CONSTRUCTOR_ELTS (c) = vals;

  FOR_EACH_VEC_SAFE_ELT (vals, i, elt)
    {
      /* Mostly ctors will have elts that don't have side-effects, so
	 the usual case is to scan all the elements.  Hence a single
	 loop for both const and side effects, rather than one loop
	 each (with early outs).  */
      if (!TREE_CONSTANT (elt->value))
	constant_p = false;
      if (TREE_SIDE_EFFECTS (elt->value))
	side_effects_p = true;
    }

  TREE_SIDE_EFFECTS (c) = side_effects_p;
  TREE_CONSTANT (c) = constant_p;

  return c;
}

/* Build a CONSTRUCTOR node made of a single initializer, with the specified
   INDEX and VALUE.  */
tree
build_constructor_single (tree type, tree index, tree value)
{
  vec<constructor_elt, va_gc> *v;
  constructor_elt elt = {index, value};

  vec_alloc (v, 1);
  v->quick_push (elt);

  return build_constructor (type, v);
}


/* Return a new CONSTRUCTOR node whose type is TYPE and whose values
   are in a list pointed to by VALS.  */
tree
build_constructor_from_list (tree type, tree vals)
{
  tree t;
  vec<constructor_elt, va_gc> *v = NULL;

  if (vals)
    {
      vec_alloc (v, list_length (vals));
      for (t = vals; t; t = TREE_CHAIN (t))
	CONSTRUCTOR_APPEND_ELT (v, TREE_PURPOSE (t), TREE_VALUE (t));
    }

  return build_constructor (type, v);
}

/* Return a new CONSTRUCTOR node whose type is TYPE.  NELTS is the number
   of elements, provided as index/value pairs.  */

tree
build_constructor_va (tree type, int nelts, ...)
{
  vec<constructor_elt, va_gc> *v = NULL;
  va_list p;

  va_start (p, nelts);
  vec_alloc (v, nelts);
  while (nelts--)
    {
      tree index = va_arg (p, tree);
      tree value = va_arg (p, tree);
      CONSTRUCTOR_APPEND_ELT (v, index, value);
    }
  va_end (p);
  return build_constructor (type, v);
}

/* Return a new FIXED_CST node whose type is TYPE and value is F.  */

tree
build_fixed (tree type, FIXED_VALUE_TYPE f)
{
  tree v;
  FIXED_VALUE_TYPE *fp;

  v = make_node (FIXED_CST);
  fp = ggc_alloc<fixed_value> ();
  memcpy (fp, &f, sizeof (FIXED_VALUE_TYPE));

  TREE_TYPE (v) = type;
  TREE_FIXED_CST_PTR (v) = fp;
  return v;
}

/* Return a new REAL_CST node whose type is TYPE and value is D.  */

tree
build_real (tree type, REAL_VALUE_TYPE d)
{
  tree v;
  REAL_VALUE_TYPE *dp;
  int overflow = 0;

  /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
     Consider doing it via real_convert now.  */

  v = make_node (REAL_CST);
  dp = ggc_alloc<real_value> ();
  memcpy (dp, &d, sizeof (REAL_VALUE_TYPE));

  TREE_TYPE (v) = type;
  TREE_REAL_CST_PTR (v) = dp;
  TREE_OVERFLOW (v) = overflow;
  return v;
}

/* Return a new REAL_CST node whose type is TYPE
   and whose value is the integer value of the INTEGER_CST node I.  */

REAL_VALUE_TYPE
real_value_from_int_cst (const_tree type, const_tree i)
{
  REAL_VALUE_TYPE d;

  /* Clear all bits of the real value type so that we can later do
     bitwise comparisons to see if two values are the same.  */
  memset (&d, 0, sizeof d);

  real_from_integer (&d, type ? TYPE_MODE (type) : VOIDmode, i,
		     TYPE_SIGN (TREE_TYPE (i)));
  return d;
}

/* Given a tree representing an integer constant I, return a tree
   representing the same value as a floating-point constant of type TYPE.  */

tree
build_real_from_int_cst (tree type, const_tree i)
{
  tree v;
  int overflow = TREE_OVERFLOW (i);

  v = build_real (type, real_value_from_int_cst (type, i));

  TREE_OVERFLOW (v) |= overflow;
  return v;
}

/* Return a newly constructed STRING_CST node whose value is
   the LEN characters at STR.
   Note that for a C string literal, LEN should include the trailing NUL.
   The TREE_TYPE is not initialized.  */

tree
build_string (int len, const char *str)
{
  tree s;
  size_t length;

  /* Do not waste bytes provided by padding of struct tree_string.  */
  length = len + offsetof (struct tree_string, str) + 1;

  record_node_allocation_statistics (STRING_CST, length);

  s = (tree) ggc_internal_alloc (length);

  memset (s, 0, sizeof (struct tree_typed));
  TREE_SET_CODE (s, STRING_CST);
  TREE_CONSTANT (s) = 1;
  TREE_STRING_LENGTH (s) = len;
  memcpy (s->string.str, str, len);
  s->string.str[len] = '\0';

  return s;
}

/* Return a newly constructed COMPLEX_CST node whose value is
   specified by the real and imaginary parts REAL and IMAG.
   Both REAL and IMAG should be constant nodes.  TYPE, if specified,
   will be the type of the COMPLEX_CST; otherwise a new type will be made.  */

tree
build_complex (tree type, tree real, tree imag)
{
  tree t = make_node (COMPLEX_CST);

  TREE_REALPART (t) = real;
  TREE_IMAGPART (t) = imag;
  TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
  TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
  return t;
}

/* Return the constant 1 in type TYPE.  If TYPE has several elements, each
   element is set to 1.  In particular, this is 1 + i for complex types.  */

tree
build_each_one_cst (tree type)
{
  if (TREE_CODE (type) == COMPLEX_TYPE)
    {
      tree scalar = build_one_cst (TREE_TYPE (type));
      return build_complex (type, scalar, scalar);
    }
  else
    return build_one_cst (type);
}

/* Return a constant of arithmetic type TYPE which is the
   multiplicative identity of the set TYPE.  */

tree
build_one_cst (tree type)
{
  switch (TREE_CODE (type))
    {
    case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE:
    case POINTER_TYPE: case REFERENCE_TYPE:
    case OFFSET_TYPE:
      return build_int_cst (type, 1);

    case REAL_TYPE:
      return build_real (type, dconst1);

    case FIXED_POINT_TYPE:
      /* We can only generate 1 for accum types.  */
      gcc_assert (ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type)));
      return build_fixed (type, FCONST1 (TYPE_MODE (type)));

    case VECTOR_TYPE:
      {
	tree scalar = build_one_cst (TREE_TYPE (type));

	return build_vector_from_val (type, scalar);
      }

    case COMPLEX_TYPE:
      return build_complex (type,
			    build_one_cst (TREE_TYPE (type)),
			    build_zero_cst (TREE_TYPE (type)));

    default:
      gcc_unreachable ();
    }
}

/* Return an integer of type TYPE containing all 1's in as much precision as
   it contains, or a complex or vector whose subparts are such integers.  */

tree
build_all_ones_cst (tree type)
{
  if (TREE_CODE (type) == COMPLEX_TYPE)
    {
      tree scalar = build_all_ones_cst (TREE_TYPE (type));
      return build_complex (type, scalar, scalar);
    }
  else
    return build_minus_one_cst (type);
}

/* Return a constant of arithmetic type TYPE which is the
   opposite of the multiplicative identity of the set TYPE.  */

tree
build_minus_one_cst (tree type)
{
  switch (TREE_CODE (type))
    {
    case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE:
    case POINTER_TYPE: case REFERENCE_TYPE:
    case OFFSET_TYPE:
      return build_int_cst (type, -1);

    case REAL_TYPE:
      return build_real (type, dconstm1);

    case FIXED_POINT_TYPE:
      /* We can only generate 1 for accum types.  */
      gcc_assert (ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type)));
      return build_fixed (type, fixed_from_double_int (double_int_minus_one,
						       TYPE_MODE (type)));

    case VECTOR_TYPE:
      {
	tree scalar = build_minus_one_cst (TREE_TYPE (type));

	return build_vector_from_val (type, scalar);
      }

    case COMPLEX_TYPE:
      return build_complex (type,
			    build_minus_one_cst (TREE_TYPE (type)),
			    build_zero_cst (TREE_TYPE (type)));

    default:
      gcc_unreachable ();
    }
}

/* Build 0 constant of type TYPE.  This is used by constructor folding
   and thus the constant should be represented in memory by
   zero(es).  */

tree
build_zero_cst (tree type)
{
  switch (TREE_CODE (type))
    {
    case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE:
    case POINTER_TYPE: case REFERENCE_TYPE:
    case OFFSET_TYPE: case NULLPTR_TYPE:
      return build_int_cst (type, 0);

    case REAL_TYPE:
      return build_real (type, dconst0);

    case FIXED_POINT_TYPE:
      return build_fixed (type, FCONST0 (TYPE_MODE (type)));

    case VECTOR_TYPE:
      {
	tree scalar = build_zero_cst (TREE_TYPE (type));

	return build_vector_from_val (type, scalar);
      }

    case COMPLEX_TYPE:
      {
	tree zero = build_zero_cst (TREE_TYPE (type));

	return build_complex (type, zero, zero);
      }

    default:
      if (!AGGREGATE_TYPE_P (type))
	return fold_convert (type, integer_zero_node);
      return build_constructor (type, NULL);
    }
}


/* Build a BINFO with LEN language slots.  */

tree
make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL)
{
  tree t;
  size_t length = (offsetof (struct tree_binfo, base_binfos)
		   + vec<tree, va_gc>::embedded_size (base_binfos));

  record_node_allocation_statistics (TREE_BINFO, length);

  t = ggc_alloc_tree_node_stat (length PASS_MEM_STAT);

  memset (t, 0, offsetof (struct tree_binfo, base_binfos));

  TREE_SET_CODE (t, TREE_BINFO);

  BINFO_BASE_BINFOS (t)->embedded_init (base_binfos);

  return t;
}

/* Create a CASE_LABEL_EXPR tree node and return it.  */

tree
build_case_label (tree low_value, tree high_value, tree label_decl)
{
  tree t = make_node (CASE_LABEL_EXPR);

  TREE_TYPE (t) = void_type_node;
  SET_EXPR_LOCATION (t, DECL_SOURCE_LOCATION (label_decl));

  CASE_LOW (t) = low_value;
  CASE_HIGH (t) = high_value;
  CASE_LABEL (t) = label_decl;
  CASE_CHAIN (t) = NULL_TREE;

  return t;
}

/* Build a newly constructed INTEGER_CST node.  LEN and EXT_LEN are the
   values of TREE_INT_CST_NUNITS and TREE_INT_CST_EXT_NUNITS respectively.
   The latter determines the length of the HOST_WIDE_INT vector.  */

tree
make_int_cst_stat (int len, int ext_len MEM_STAT_DECL)
{
  tree t;
  int length = ((ext_len - 1) * sizeof (HOST_WIDE_INT)
		+ sizeof (struct tree_int_cst));

  gcc_assert (len);
  record_node_allocation_statistics (INTEGER_CST, length);

  t = ggc_alloc_cleared_tree_node_stat (length PASS_MEM_STAT);

  TREE_SET_CODE (t, INTEGER_CST);
  TREE_INT_CST_NUNITS (t) = len;
  TREE_INT_CST_EXT_NUNITS (t) = ext_len;
  /* to_offset can only be applied to trees that are offset_int-sized
     or smaller.  EXT_LEN is correct if it fits, otherwise the constant
     must be exactly the precision of offset_int and so LEN is correct.  */
  if (ext_len <= OFFSET_INT_ELTS)
    TREE_INT_CST_OFFSET_NUNITS (t) = ext_len;
  else
    TREE_INT_CST_OFFSET_NUNITS (t) = len;

  TREE_CONSTANT (t) = 1;

  return t;
}

/* Build a newly constructed TREE_VEC node of length LEN.  */

tree
make_tree_vec_stat (int len MEM_STAT_DECL)
{
  tree t;
  int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);

  record_node_allocation_statistics (TREE_VEC, length);

  t = ggc_alloc_cleared_tree_node_stat (length PASS_MEM_STAT);

  TREE_SET_CODE (t, TREE_VEC);
  TREE_VEC_LENGTH (t) = len;

  return t;
}

/* Grow a TREE_VEC node to new length LEN.  */

tree
grow_tree_vec_stat (tree v, int len MEM_STAT_DECL)
{
  gcc_assert (TREE_CODE (v) == TREE_VEC);

  int oldlen = TREE_VEC_LENGTH (v);
  gcc_assert (len > oldlen);

  int oldlength = (oldlen - 1) * sizeof (tree) + sizeof (struct tree_vec);
  int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);

  record_node_allocation_statistics (TREE_VEC, length - oldlength);

  v = (tree) ggc_realloc (v, length PASS_MEM_STAT);

  TREE_VEC_LENGTH (v) = len;

  return v;
}

/* Return 1 if EXPR is the integer constant zero or a complex constant
   of zero.  */

int
integer_zerop (const_tree expr)
{
  STRIP_NOPS (expr);

  switch (TREE_CODE (expr))
    {
    case INTEGER_CST:
      return wi::eq_p (expr, 0);
    case COMPLEX_CST:
      return (integer_zerop (TREE_REALPART (expr))
	      && integer_zerop (TREE_IMAGPART (expr)));
    case VECTOR_CST:
      {
	unsigned i;
	for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
	  if (!integer_zerop (VECTOR_CST_ELT (expr, i)))
	    return false;
	return true;
      }
    default:
      return false;
    }
}

/* Return 1 if EXPR is the integer constant one or the corresponding
   complex constant.  */

int
integer_onep (const_tree expr)
{
  STRIP_NOPS (expr);

  switch (TREE_CODE (expr))
    {
    case INTEGER_CST:
      return wi::eq_p (wi::to_widest (expr), 1);
    case COMPLEX_CST:
      return (integer_onep (TREE_REALPART (expr))
	      && integer_zerop (TREE_IMAGPART (expr)));
    case VECTOR_CST:
      {
	unsigned i;
	for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
	  if (!integer_onep (VECTOR_CST_ELT (expr, i)))
	    return false;
	return true;
      }
    default:
      return false;
    }
}

/* Return 1 if EXPR is the integer constant one.  For complex and vector,
   return 1 if every piece is the integer constant one.  */

int
integer_each_onep (const_tree expr)
{
  STRIP_NOPS (expr);

  if (TREE_CODE (expr) == COMPLEX_CST)
    return (integer_onep (TREE_REALPART (expr))
	    && integer_onep (TREE_IMAGPART (expr)));
  else
    return integer_onep (expr);
}

/* Return 1 if EXPR is an integer containing all 1's in as much precision as
   it contains, or a complex or vector whose subparts are such integers.  */

int
integer_all_onesp (const_tree expr)
{
  STRIP_NOPS (expr);

  if (TREE_CODE (expr) == COMPLEX_CST
      && integer_all_onesp (TREE_REALPART (expr))
      && integer_all_onesp (TREE_IMAGPART (expr)))
    return 1;

  else if (TREE_CODE (expr) == VECTOR_CST)
    {
      unsigned i;
      for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
	if (!integer_all_onesp (VECTOR_CST_ELT (expr, i)))
	  return 0;
      return 1;
    }

  else if (TREE_CODE (expr) != INTEGER_CST)
    return 0;

  return wi::max_value (TYPE_PRECISION (TREE_TYPE (expr)), UNSIGNED) == expr;
}

/* Return 1 if EXPR is the integer constant minus one.  */

int
integer_minus_onep (const_tree expr)
{
  STRIP_NOPS (expr);

  if (TREE_CODE (expr) == COMPLEX_CST)
    return (integer_all_onesp (TREE_REALPART (expr))
	    && integer_zerop (TREE_IMAGPART (expr)));
  else
    return integer_all_onesp (expr);
}

/* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
   one bit on).  */

int
integer_pow2p (const_tree expr)
{
  STRIP_NOPS (expr);

  if (TREE_CODE (expr) == COMPLEX_CST
      && integer_pow2p (TREE_REALPART (expr))
      && integer_zerop (TREE_IMAGPART (expr)))
    return 1;

  if (TREE_CODE (expr) != INTEGER_CST)
    return 0;

  return wi::popcount (expr) == 1;
}

/* Return 1 if EXPR is an integer constant other than zero or a
   complex constant other than zero.  */

int
integer_nonzerop (const_tree expr)
{
  STRIP_NOPS (expr);

  return ((TREE_CODE (expr) == INTEGER_CST
	   && !wi::eq_p (expr, 0))
	  || (TREE_CODE (expr) == COMPLEX_CST
	      && (integer_nonzerop (TREE_REALPART (expr))
		  || integer_nonzerop (TREE_IMAGPART (expr)))));
}

/* Return 1 if EXPR is the integer constant one.  For vector,
   return 1 if every piece is the integer constant minus one
   (representing the value TRUE).  */

int
integer_truep (const_tree expr)
{
  STRIP_NOPS (expr);

  if (TREE_CODE (expr) == VECTOR_CST)
    return integer_all_onesp (expr);
  return integer_onep (expr);
}

/* Return 1 if EXPR is the fixed-point constant zero.  */

int
fixed_zerop (const_tree expr)
{
  return (TREE_CODE (expr) == FIXED_CST
	  && TREE_FIXED_CST (expr).data.is_zero ());
}

/* Return the power of two represented by a tree node known to be a
   power of two.  */

int
tree_log2 (const_tree expr)
{
  STRIP_NOPS (expr);

  if (TREE_CODE (expr) == COMPLEX_CST)
    return tree_log2 (TREE_REALPART (expr));

  return wi::exact_log2 (expr);
}

/* Similar, but return the largest integer Y such that 2 ** Y is less
   than or equal to EXPR.  */

int
tree_floor_log2 (const_tree expr)
{
  STRIP_NOPS (expr);

  if (TREE_CODE (expr) == COMPLEX_CST)
    return tree_log2 (TREE_REALPART (expr));

  return wi::floor_log2 (expr);
}

/* Return number of known trailing zero bits in EXPR, or, if the value of
   EXPR is known to be zero, the precision of it's type.  */

unsigned int
tree_ctz (const_tree expr)
{
  if (!INTEGRAL_TYPE_P (TREE_TYPE (expr))
      && !POINTER_TYPE_P (TREE_TYPE (expr)))
    return 0;

  unsigned int ret1, ret2, prec = TYPE_PRECISION (TREE_TYPE (expr));
  switch (TREE_CODE (expr))
    {
    case INTEGER_CST:
      ret1 = wi::ctz (expr);
      return MIN (ret1, prec);
    case SSA_NAME:
      ret1 = wi::ctz (get_nonzero_bits (expr));
      return MIN (ret1, prec);
    case PLUS_EXPR:
    case MINUS_EXPR:
    case BIT_IOR_EXPR:
    case BIT_XOR_EXPR:
    case MIN_EXPR:
    case MAX_EXPR:
      ret1 = tree_ctz (TREE_OPERAND (expr, 0));
      if (ret1 == 0)
	return ret1;
      ret2 = tree_ctz (TREE_OPERAND (expr, 1));
      return MIN (ret1, ret2);
    case POINTER_PLUS_EXPR:
      ret1 = tree_ctz (TREE_OPERAND (expr, 0));
      ret2 = tree_ctz (TREE_OPERAND (expr, 1));
      /* Second operand is sizetype, which could be in theory
	 wider than pointer's precision.  Make sure we never
	 return more than prec.  */
      ret2 = MIN (ret2, prec);
      return MIN (ret1, ret2);
    case BIT_AND_EXPR:
      ret1 = tree_ctz (TREE_OPERAND (expr, 0));
      ret2 = tree_ctz (TREE_OPERAND (expr, 1));
      return MAX (ret1, ret2);
    case MULT_EXPR:
      ret1 = tree_ctz (TREE_OPERAND (expr, 0));
      ret2 = tree_ctz (TREE_OPERAND (expr, 1));
      return MIN (ret1 + ret2, prec);
    case LSHIFT_EXPR:
      ret1 = tree_ctz (TREE_OPERAND (expr, 0));
      if (tree_fits_uhwi_p (TREE_OPERAND (expr, 1))
	  && (tree_to_uhwi (TREE_OPERAND (expr, 1)) < prec))
	{
	  ret2 = tree_to_uhwi (TREE_OPERAND (expr, 1));
	  return MIN (ret1 + ret2, prec);
	}
      return ret1;
    case RSHIFT_EXPR:
      if (tree_fits_uhwi_p (TREE_OPERAND (expr, 1))
	  && (tree_to_uhwi (TREE_OPERAND (expr, 1)) < prec))
	{
	  ret1 = tree_ctz (TREE_OPERAND (expr, 0));
	  ret2 = tree_to_uhwi (TREE_OPERAND (expr, 1));
	  if (ret1 > ret2)
	    return ret1 - ret2;
	}
      return 0;
    case TRUNC_DIV_EXPR:
    case CEIL_DIV_EXPR:
    case FLOOR_DIV_EXPR:
    case ROUND_DIV_EXPR:
    case EXACT_DIV_EXPR:
      if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST
	  && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) == 1)
	{
	  int l = tree_log2 (TREE_OPERAND (expr, 1));
	  if (l >= 0)
	    {
	      ret1 = tree_ctz (TREE_OPERAND (expr, 0));
	      ret2 = l;
	      if (ret1 > ret2)
		return ret1 - ret2;
	    }
	}
      return 0;
    CASE_CONVERT:
      ret1 = tree_ctz (TREE_OPERAND (expr, 0));
      if (ret1 && ret1 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
	ret1 = prec;
      return MIN (ret1, prec);
    case SAVE_EXPR:
      return tree_ctz (TREE_OPERAND (expr, 0));
    case COND_EXPR:
      ret1 = tree_ctz (TREE_OPERAND (expr, 1));
      if (ret1 == 0)
	return 0;
      ret2 = tree_ctz (TREE_OPERAND (expr, 2));
      return MIN (ret1, ret2);
    case COMPOUND_EXPR:
      return tree_ctz (TREE_OPERAND (expr, 1));
    case ADDR_EXPR:
      ret1 = get_pointer_alignment (CONST_CAST_TREE (expr));
      if (ret1 > BITS_PER_UNIT)
	{
	  ret1 = ctz_hwi (ret1 / BITS_PER_UNIT);
	  return MIN (ret1, prec);
	}
      return 0;
    default:
      return 0;
    }
}

/* Return 1 if EXPR is the real constant zero.  Trailing zeroes matter for
   decimal float constants, so don't return 1 for them.  */

int
real_zerop (const_tree expr)
{
  STRIP_NOPS (expr);

  switch (TREE_CODE (expr))
    {
    case REAL_CST:
      return REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0)
	     && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr))));
    case COMPLEX_CST:
      return real_zerop (TREE_REALPART (expr))
	     && real_zerop (TREE_IMAGPART (expr));
    case VECTOR_CST:
      {
	unsigned i;
	for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
	  if (!real_zerop (VECTOR_CST_ELT (expr, i)))
	    return false;
	return true;
      }
    default:
      return false;
    }
}

/* Return 1 if EXPR is the real constant one in real or complex form.
   Trailing zeroes matter for decimal float constants, so don't return
   1 for them.  */

int
real_onep (const_tree expr)
{
  STRIP_NOPS (expr);

  switch (TREE_CODE (expr))
    {
    case REAL_CST:
      return REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1)
	     && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr))));
    case COMPLEX_CST:
      return real_onep (TREE_REALPART (expr))
	     && real_zerop (TREE_IMAGPART (expr));
    case VECTOR_CST:
      {
	unsigned i;
	for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
	  if (!real_onep (VECTOR_CST_ELT (expr, i)))
	    return false;
	return true;
      }
    default:
      return false;
    }
}

/* Return 1 if EXPR is the real constant minus one.  Trailing zeroes
   matter for decimal float constants, so don't return 1 for them.  */

int
real_minus_onep (const_tree expr)
{
  STRIP_NOPS (expr);

  switch (TREE_CODE (expr))
    {
    case REAL_CST:
      return REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconstm1)
	     && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr))));
    case COMPLEX_CST:
      return real_minus_onep (TREE_REALPART (expr))
	     && real_zerop (TREE_IMAGPART (expr));
    case VECTOR_CST:
      {
	unsigned i;
	for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
	  if (!real_minus_onep (VECTOR_CST_ELT (expr, i)))
	    return false;
	return true;
      }
    default:
      return false;
    }
}

/* Nonzero if EXP is a constant or a cast of a constant.  */

int
really_constant_p (const_tree exp)
{
  /* This is not quite the same as STRIP_NOPS.  It does more.  */
  while (CONVERT_EXPR_P (exp)
	 || TREE_CODE (exp) == NON_LVALUE_EXPR)
    exp = TREE_OPERAND (exp, 0);
  return TREE_CONSTANT (exp);
}

/* Return first list element whose TREE_VALUE is ELEM.
   Return 0 if ELEM is not in LIST.  */

tree
value_member (tree elem, tree list)
{
  while (list)
    {
      if (elem == TREE_VALUE (list))
	return list;
      list = TREE_CHAIN (list);
    }
  return NULL_TREE;
}

/* Return first list element whose TREE_PURPOSE is ELEM.
   Return 0 if ELEM is not in LIST.  */

tree
purpose_member (const_tree elem, tree list)
{
  while (list)
    {
      if (elem == TREE_PURPOSE (list))
	return list;
      list = TREE_CHAIN (list);
    }
  return NULL_TREE;
}

/* Return true if ELEM is in V.  */

bool
vec_member (const_tree elem, vec<tree, va_gc> *v)
{
  unsigned ix;
  tree t;
  FOR_EACH_VEC_SAFE_ELT (v, ix, t)
    if (elem == t)
      return true;
  return false;
}

/* Returns element number IDX (zero-origin) of chain CHAIN, or
   NULL_TREE.  */

tree
chain_index (int idx, tree chain)
{
  for (; chain && idx > 0; --idx)
    chain = TREE_CHAIN (chain);
  return chain;
}

/* Return nonzero if ELEM is part of the chain CHAIN.  */

int
chain_member (const_tree elem, const_tree chain)
{
  while (chain)
    {
      if (elem == chain)
	return 1;
      chain = DECL_CHAIN (chain);
    }

  return 0;
}

/* Return the length of a chain of nodes chained through TREE_CHAIN.
   We expect a null pointer to mark the end of the chain.
   This is the Lisp primitive `length'.  */

int
list_length (const_tree t)
{
  const_tree p = t;
#ifdef ENABLE_TREE_CHECKING
  const_tree q = t;
#endif
  int len = 0;

  while (p)
    {
      p = TREE_CHAIN (p);
#ifdef ENABLE_TREE_CHECKING
      if (len % 2)
	q = TREE_CHAIN (q);
      gcc_assert (p != q);
#endif
      len++;
    }

  return len;
}

/* Returns the first FIELD_DECL in the TYPE_FIELDS of the RECORD_TYPE or
   UNION_TYPE TYPE, or NULL_TREE if none.  */

tree
first_field (const_tree type)
{
  tree t = TYPE_FIELDS (type);
  while (t && TREE_CODE (t) != FIELD_DECL)
    t = TREE_CHAIN (t);
  return t;
}

/* Concatenate two chains of nodes (chained through TREE_CHAIN)
   by modifying the last node in chain 1 to point to chain 2.
   This is the Lisp primitive `nconc'.  */

tree
chainon (tree op1, tree op2)
{
  tree t1;

  if (!op1)
    return op2;
  if (!op2)
    return op1;

  for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
    continue;
  TREE_CHAIN (t1) = op2;

#ifdef ENABLE_TREE_CHECKING
  {
    tree t2;
    for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
      gcc_assert (t2 != t1);
  }
#endif

  return op1;
}

/* Return the last node in a chain of nodes (chained through TREE_CHAIN).  */

tree
tree_last (tree chain)
{
  tree next;
  if (chain)
    while ((next = TREE_CHAIN (chain)))
      chain = next;
  return chain;
}

/* Reverse the order of elements in the chain T,
   and return the new head of the chain (old last element).  */

tree
nreverse (tree t)
{
  tree prev = 0, decl, next;
  for (decl = t; decl; decl = next)
    {
      /* We shouldn't be using this function to reverse BLOCK chains; we
	 have blocks_nreverse for that.  */
      gcc_checking_assert (TREE_CODE (decl) != BLOCK);
      next = TREE_CHAIN (decl);
      TREE_CHAIN (decl) = prev;
      prev = decl;
    }
  return prev;
}

/* Return a newly created TREE_LIST node whose
   purpose and value fields are PARM and VALUE.  */

tree
build_tree_list_stat (tree parm, tree value MEM_STAT_DECL)
{
  tree t = make_node_stat (TREE_LIST PASS_MEM_STAT);
  TREE_PURPOSE (t) = parm;
  TREE_VALUE (t) = value;
  return t;
}

/* Build a chain of TREE_LIST nodes from a vector.  */

tree
build_tree_list_vec_stat (const vec<tree, va_gc> *vec MEM_STAT_DECL)
{
  tree ret = NULL_TREE;
  tree *pp = &ret;
  unsigned int i;
  tree t;
  FOR_EACH_VEC_SAFE_ELT (vec, i, t)
    {
      *pp = build_tree_list_stat (NULL, t PASS_MEM_STAT);
      pp = &TREE_CHAIN (*pp);
    }
  return ret;
}

/* Return a newly created TREE_LIST node whose
   purpose and value fields are PURPOSE and VALUE
   and whose TREE_CHAIN is CHAIN.  */

tree 
tree_cons_stat (tree purpose, tree value, tree chain MEM_STAT_DECL)
{
  tree node;

  node = ggc_alloc_tree_node_stat (sizeof (struct tree_list) PASS_MEM_STAT);
  memset (node, 0, sizeof (struct tree_common));

  record_node_allocation_statistics (TREE_LIST, sizeof (struct tree_list));

  TREE_SET_CODE (node, TREE_LIST);
  TREE_CHAIN (node) = chain;
  TREE_PURPOSE (node) = purpose;
  TREE_VALUE (node) = value;
  return node;
}

/* Return the values of the elements of a CONSTRUCTOR as a vector of
   trees.  */

vec<tree, va_gc> *
ctor_to_vec (tree ctor)
{
  vec<tree, va_gc> *vec;
  vec_alloc (vec, CONSTRUCTOR_NELTS (ctor));
  unsigned int ix;
  tree val;

  FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (ctor), ix, val)
    vec->quick_push (val);

  return vec;
}

/* Return the size nominally occupied by an object of type TYPE
   when it resides in memory.  The value is measured in units of bytes,
   and its data type is that normally used for type sizes
   (which is the first type created by make_signed_type or
   make_unsigned_type).  */

tree
size_in_bytes (const_tree type)
{
  tree t;

  if (type == error_mark_node)
    return integer_zero_node;

  type = TYPE_MAIN_VARIANT (type);
  t = TYPE_SIZE_UNIT (type);

  if (t == 0)
    {
      lang_hooks.types.incomplete_type_error (NULL_TREE, type);
      return size_zero_node;
    }

  return t;
}

/* Return the size of TYPE (in bytes) as a wide integer
   or return -1 if the size can vary or is larger than an integer.  */

HOST_WIDE_INT
int_size_in_bytes (const_tree type)
{
  tree t;

  if (type == error_mark_node)
    return 0;

  type = TYPE_MAIN_VARIANT (type);
  t = TYPE_SIZE_UNIT (type);

  if (t && tree_fits_uhwi_p (t))
    return TREE_INT_CST_LOW (t);
  else
    return -1;
}

/* Return the maximum size of TYPE (in bytes) as a wide integer
   or return -1 if the size can vary or is larger than an integer.  */

HOST_WIDE_INT
max_int_size_in_bytes (const_tree type)
{
  HOST_WIDE_INT size = -1;
  tree size_tree;

  /* If this is an array type, check for a possible MAX_SIZE attached.  */

  if (TREE_CODE (type) == ARRAY_TYPE)
    {
      size_tree = TYPE_ARRAY_MAX_SIZE (type);

      if (size_tree && tree_fits_uhwi_p (size_tree))
	size = tree_to_uhwi (size_tree);
    }

  /* If we still haven't been able to get a size, see if the language
     can compute a maximum size.  */

  if (size == -1)
    {
      size_tree = lang_hooks.types.max_size (type);

      if (size_tree && tree_fits_uhwi_p (size_tree))
	size = tree_to_uhwi (size_tree);
    }

  return size;
}

/* Return the bit position of FIELD, in bits from the start of the record.
   This is a tree of type bitsizetype.  */

tree
bit_position (const_tree field)
{
  return bit_from_pos (DECL_FIELD_OFFSET (field),
		       DECL_FIELD_BIT_OFFSET (field));
}

/* Return the byte position of FIELD, in bytes from the start of the record.
   This is a tree of type sizetype.  */

tree
byte_position (const_tree field)
{
  return byte_from_pos (DECL_FIELD_OFFSET (field),
			DECL_FIELD_BIT_OFFSET (field));
}

/* Likewise, but return as an integer.  It must be representable in
   that way (since it could be a signed value, we don't have the
   option of returning -1 like int_size_in_byte can.  */

HOST_WIDE_INT
int_byte_position (const_tree field)
{
  return tree_to_shwi (byte_position (field));
}

/* Return the strictest alignment, in bits, that T is known to have.  */

unsigned int
expr_align (const_tree t)
{
  unsigned int align0, align1;

  switch (TREE_CODE (t))
    {
    CASE_CONVERT:  case NON_LVALUE_EXPR:
      /* If we have conversions, we know that the alignment of the
	 object must meet each of the alignments of the types.  */
      align0 = expr_align (TREE_OPERAND (t, 0));
      align1 = TYPE_ALIGN (TREE_TYPE (t));
      return MAX (align0, align1);

    case SAVE_EXPR:         case COMPOUND_EXPR:       case MODIFY_EXPR:
    case INIT_EXPR:         case TARGET_EXPR:         case WITH_CLEANUP_EXPR:
    case CLEANUP_POINT_EXPR:
      /* These don't change the alignment of an object.  */
      return expr_align (TREE_OPERAND (t, 0));

    case COND_EXPR:
      /* The best we can do is say that the alignment is the least aligned
	 of the two arms.  */
      align0 = expr_align (TREE_OPERAND (t, 1));
      align1 = expr_align (TREE_OPERAND (t, 2));
      return MIN (align0, align1);

      /* FIXME: LABEL_DECL and CONST_DECL never have DECL_ALIGN set
	 meaningfully, it's always 1.  */
    case LABEL_DECL:     case CONST_DECL:
    case VAR_DECL:       case PARM_DECL:   case RESULT_DECL:
    case FUNCTION_DECL:
      gcc_assert (DECL_ALIGN (t) != 0);
      return DECL_ALIGN (t);

    default:
      break;
    }

  /* Otherwise take the alignment from that of the type.  */
  return TYPE_ALIGN (TREE_TYPE (t));
}

/* Return, as a tree node, the number of elements for TYPE (which is an
   ARRAY_TYPE) minus one. This counts only elements of the top array.  */

tree
array_type_nelts (const_tree type)
{
  tree index_type, min, max;

  /* If they did it with unspecified bounds, then we should have already
     given an error about it before we got here.  */
  if (! TYPE_DOMAIN (type))
    return error_mark_node;

  index_type = TYPE_DOMAIN (type);
  min = TYPE_MIN_VALUE (index_type);
  max = TYPE_MAX_VALUE (index_type);

  /* TYPE_MAX_VALUE may not be set if the array has unknown length.  */
  if (!max)
    return error_mark_node;

  return (integer_zerop (min)
	  ? max
	  : fold_build2 (MINUS_EXPR, TREE_TYPE (max), max, min));
}

/* If arg is static -- a reference to an object in static storage -- then
   return the object.  This is not the same as the C meaning of `static'.
   If arg isn't static, return NULL.  */

tree
staticp (tree arg)
{
  switch (TREE_CODE (arg))
    {
    case FUNCTION_DECL:
      /* Nested functions are static, even though taking their address will
	 involve a trampoline as we unnest the nested function and create
	 the trampoline on the tree level.  */
      return arg;

    case VAR_DECL:
      return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
	      && ! DECL_THREAD_LOCAL_P (arg)
	      && ! DECL_DLLIMPORT_P (arg)
	      ? arg : NULL);

    case CONST_DECL:
      return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
	      ? arg : NULL);

    case CONSTRUCTOR:
      return TREE_STATIC (arg) ? arg : NULL;

    case LABEL_DECL:
    case STRING_CST:
      return arg;

    case COMPONENT_REF:
      /* If the thing being referenced is not a field, then it is
	 something language specific.  */
      gcc_assert (TREE_CODE (TREE_OPERAND (arg, 1)) == FIELD_DECL);

      /* If we are referencing a bitfield, we can't evaluate an
	 ADDR_EXPR at compile time and so it isn't a constant.  */
      if (DECL_BIT_FIELD (TREE_OPERAND (arg, 1)))
	return NULL;

      return staticp (TREE_OPERAND (arg, 0));

    case BIT_FIELD_REF:
      return NULL;

    case INDIRECT_REF:
      return TREE_CONSTANT (TREE_OPERAND (arg, 0)) ? arg : NULL;

    case ARRAY_REF:
    case ARRAY_RANGE_REF:
      if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
	  && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
	return staticp (TREE_OPERAND (arg, 0));
      else
	return NULL;

    case COMPOUND_LITERAL_EXPR:
      return TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (arg)) ? arg : NULL;

    default:
      return NULL;
    }
}




/* Return whether OP is a DECL whose address is function-invariant.  */

bool
decl_address_invariant_p (const_tree op)
{
  /* The conditions below are slightly less strict than the one in
     staticp.  */

  switch (TREE_CODE (op))
    {
    case PARM_DECL:
    case RESULT_DECL:
    case LABEL_DECL:
    case FUNCTION_DECL:
      return true;

    case VAR_DECL:
      if ((TREE_STATIC (op) || DECL_EXTERNAL (op))
          || DECL_THREAD_LOCAL_P (op)
          || DECL_CONTEXT (op) == current_function_decl
          || decl_function_context (op) == current_function_decl)
        return true;
      break;

    case CONST_DECL:
      if ((TREE_STATIC (op) || DECL_EXTERNAL (op))
          || decl_function_context (op) == current_function_decl)
        return true;
      break;

    default:
      break;
    }

  return false;
}

/* Return whether OP is a DECL whose address is interprocedural-invariant.  */

bool
decl_address_ip_invariant_p (const_tree op)
{
  /* The conditions below are slightly less strict than the one in
     staticp.  */

  switch (TREE_CODE (op))
    {
    case LABEL_DECL:
    case FUNCTION_DECL:
    case STRING_CST:
      return true;

    case VAR_DECL:
      if (((TREE_STATIC (op) || DECL_EXTERNAL (op))
           && !DECL_DLLIMPORT_P (op))
          || DECL_THREAD_LOCAL_P (op))
        return true;
      break;

    case CONST_DECL:
      if ((TREE_STATIC (op) || DECL_EXTERNAL (op)))
        return true;
      break;

    default:
      break;
    }

  return false;
}


/* Return true if T is function-invariant (internal function, does
   not handle arithmetic; that's handled in skip_simple_arithmetic and
   tree_invariant_p).  */

static bool tree_invariant_p (tree t);

static bool
tree_invariant_p_1 (tree t)
{
  tree op;

  if (TREE_CONSTANT (t)
      || (TREE_READONLY (t) && !TREE_SIDE_EFFECTS (t)))
    return true;

  switch (TREE_CODE (t))
    {
    case SAVE_EXPR:
      return true;

    case ADDR_EXPR:
      op = TREE_OPERAND (t, 0);
      while (handled_component_p (op))
	{
	  switch (TREE_CODE (op))
	    {
	    case ARRAY_REF:
	    case ARRAY_RANGE_REF:
	      if (!tree_invariant_p (TREE_OPERAND (op, 1))
		  || TREE_OPERAND (op, 2) != NULL_TREE
		  || TREE_OPERAND (op, 3) != NULL_TREE)
		return false;
	      break;

	    case COMPONENT_REF:
	      if (TREE_OPERAND (op, 2) != NULL_TREE)
		return false;
	      break;

	    default:;
	    }
	  op = TREE_OPERAND (op, 0);
	}

      return CONSTANT_CLASS_P (op) || decl_address_invariant_p (op);

    default:
      break;
    }

  return false;
}

/* Return true if T is function-invariant.  */

static bool
tree_invariant_p (tree t)
{
  tree inner = skip_simple_arithmetic (t);
  return tree_invariant_p_1 (inner);
}

/* Wrap a SAVE_EXPR around EXPR, if appropriate.
   Do this to any expression which may be used in more than one place,
   but must be evaluated only once.

   Normally, expand_expr would reevaluate the expression each time.
   Calling save_expr produces something that is evaluated and recorded
   the first time expand_expr is called on it.  Subsequent calls to
   expand_expr just reuse the recorded value.

   The call to expand_expr that generates code that actually computes
   the value is the first call *at compile time*.  Subsequent calls
   *at compile time* generate code to use the saved value.
   This produces correct result provided that *at run time* control
   always flows through the insns made by the first expand_expr
   before reaching the other places where the save_expr was evaluated.
   You, the caller of save_expr, must make sure this is so.

   Constants, and certain read-only nodes, are returned with no
   SAVE_EXPR because that is safe.  Expressions containing placeholders
   are not touched; see tree.def for an explanation of what these
   are used for.  */

tree
save_expr (tree expr)
{
  tree t = fold (expr);
  tree inner;

  /* If the tree evaluates to a constant, then we don't want to hide that
     fact (i.e. this allows further folding, and direct checks for constants).
     However, a read-only object that has side effects cannot be bypassed.
     Since it is no problem to reevaluate literals, we just return the
     literal node.  */
  inner = skip_simple_arithmetic (t);
  if (TREE_CODE (inner) == ERROR_MARK)
    return inner;

  if (tree_invariant_p_1 (inner))
    return t;

  /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
     it means that the size or offset of some field of an object depends on
     the value within another field.

     Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
     and some variable since it would then need to be both evaluated once and
     evaluated more than once.  Front-ends must assure this case cannot
     happen by surrounding any such subexpressions in their own SAVE_EXPR
     and forcing evaluation at the proper time.  */
  if (contains_placeholder_p (inner))
    return t;

  t = build1 (SAVE_EXPR, TREE_TYPE (expr), t);
  SET_EXPR_LOCATION (t, EXPR_LOCATION (expr));

  /* This expression might be placed ahead of a jump to ensure that the
     value was computed on both sides of the jump.  So make sure it isn't
     eliminated as dead.  */
  TREE_SIDE_EFFECTS (t) = 1;
  return t;
}

/* Look inside EXPR into any simple arithmetic operations.  Return the
   outermost non-arithmetic or non-invariant node.  */

tree
skip_simple_arithmetic (tree expr)
{
  /* We don't care about whether this can be used as an lvalue in this
     context.  */
  while (TREE_CODE (expr) == NON_LVALUE_EXPR)
    expr = TREE_OPERAND (expr, 0);

  /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
     a constant, it will be more efficient to not make another SAVE_EXPR since
     it will allow better simplification and GCSE will be able to merge the
     computations if they actually occur.  */
  while (true)
    {
      if (UNARY_CLASS_P (expr))
	expr = TREE_OPERAND (expr, 0);
      else if (BINARY_CLASS_P (expr))
	{
	  if (tree_invariant_p (TREE_OPERAND (expr, 1)))
	    expr = TREE_OPERAND (expr, 0);
	  else if (tree_invariant_p (TREE_OPERAND (expr, 0)))
	    expr = TREE_OPERAND (expr, 1);
	  else
	    break;
	}
      else
	break;
    }

  return expr;
}

/* Look inside EXPR into simple arithmetic operations involving constants.
   Return the outermost non-arithmetic or non-constant node.  */

tree
skip_simple_constant_arithmetic (tree expr)
{
  while (TREE_CODE (expr) == NON_LVALUE_EXPR)
    expr = TREE_OPERAND (expr, 0);

  while (true)
    {
      if (UNARY_CLASS_P (expr))
	expr = TREE_OPERAND (expr, 0);
      else if (BINARY_CLASS_P (expr))
	{
	  if (TREE_CONSTANT (TREE_OPERAND (expr, 1)))
	    expr = TREE_OPERAND (expr, 0);
	  else if (TREE_CONSTANT (TREE_OPERAND (expr, 0)))
	    expr = TREE_OPERAND (expr, 1);
	  else
	    break;
	}
      else
	break;
    }

  return expr;
}

/* Return which tree structure is used by T.  */

enum tree_node_structure_enum
tree_node_structure (const_tree t)
{
  const enum tree_code code = TREE_CODE (t);
  return tree_node_structure_for_code (code);
}

/* Set various status flags when building a CALL_EXPR object T.  */

static void
process_call_operands (tree t)
{
  bool side_effects = TREE_SIDE_EFFECTS (t);
  bool read_only = false;
  int i = call_expr_flags (t);

  /* Calls have side-effects, except those to const or pure functions.  */
  if ((i & ECF_LOOPING_CONST_OR_PURE) || !(i & (ECF_CONST | ECF_PURE)))
    side_effects = true;
  /* Propagate TREE_READONLY of arguments for const functions.  */
  if (i & ECF_CONST)
    read_only = true;

  if (!side_effects || read_only)
    for (i = 1; i < TREE_OPERAND_LENGTH (t); i++)
      {
	tree op = TREE_OPERAND (t, i);
	if (op && TREE_SIDE_EFFECTS (op))
	  side_effects = true;
	if (op && !TREE_READONLY (op) && !CONSTANT_CLASS_P (op))
	  read_only = false;
      }

  TREE_SIDE_EFFECTS (t) = side_effects;
  TREE_READONLY (t) = read_only;
}

/* Return true if EXP contains a PLACEHOLDER_EXPR, i.e. if it represents a
   size or offset that depends on a field within a record.  */

bool
contains_placeholder_p (const_tree exp)
{
  enum tree_code code;

  if (!exp)
    return 0;

  code = TREE_CODE (exp);
  if (code == PLACEHOLDER_EXPR)
    return 1;

  switch (TREE_CODE_CLASS (code))
    {
    case tcc_reference:
      /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
	 position computations since they will be converted into a
	 WITH_RECORD_EXPR involving the reference, which will assume
	 here will be valid.  */
      return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));

    case tcc_exceptional:
      if (code == TREE_LIST)
	return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp))
		|| CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp)));
      break;

    case tcc_unary:
    case tcc_binary:
    case tcc_comparison:
    case tcc_expression:
      switch (code)
	{
	case COMPOUND_EXPR:
	  /* Ignoring the first operand isn't quite right, but works best.  */
	  return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1));

	case COND_EXPR:
	  return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
		  || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1))
		  || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 2)));

	case SAVE_EXPR:
	  /* The save_expr function never wraps anything containing
	     a PLACEHOLDER_EXPR. */
	  return 0;

	default:
	  break;
	}

      switch (TREE_CODE_LENGTH (code))
	{
	case 1:
	  return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
	case 2:
	  return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
		  || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1)));
	default:
	  return 0;
	}

    case tcc_vl_exp:
      switch (code)
	{
	case CALL_EXPR:
	  {
	    const_tree arg;
	    const_call_expr_arg_iterator iter;
	    FOR_EACH_CONST_CALL_EXPR_ARG (arg, iter, exp)
	      if (CONTAINS_PLACEHOLDER_P (arg))
		return 1;
	    return 0;
	  }
	default:
	  return 0;
	}

    default:
      return 0;
    }
  return 0;
}

/* Return true if any part of the structure of TYPE involves a PLACEHOLDER_EXPR
   directly.  This includes size, bounds, qualifiers (for QUAL_UNION_TYPE) and
   field positions.  */

static bool
type_contains_placeholder_1 (const_tree type)
{
  /* If the size contains a placeholder or the parent type (component type in
     the case of arrays) type involves a placeholder, this type does.  */
  if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type))
      || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type))
      || (!POINTER_TYPE_P (type)
	  && TREE_TYPE (type)
	  && type_contains_placeholder_p (TREE_TYPE (type))))
    return true;

  /* Now do type-specific checks.  Note that the last part of the check above
     greatly limits what we have to do below.  */
  switch (TREE_CODE (type))
    {
    case VOID_TYPE:
    case POINTER_BOUNDS_TYPE:
    case COMPLEX_TYPE:
    case ENUMERAL_TYPE:
    case BOOLEAN_TYPE:
    case POINTER_TYPE:
    case OFFSET_TYPE:
    case REFERENCE_TYPE:
    case METHOD_TYPE:
    case FUNCTION_TYPE:
    case VECTOR_TYPE:
    case NULLPTR_TYPE:
      return false;

    case INTEGER_TYPE:
    case REAL_TYPE:
    case FIXED_POINT_TYPE:
      /* Here we just check the bounds.  */
      return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type))
	      || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type)));

    case ARRAY_TYPE:
      /* We have already checked the component type above, so just check the
	 domain type.  */
      return type_contains_placeholder_p (TYPE_DOMAIN (type));

    case RECORD_TYPE:
    case UNION_TYPE:
    case QUAL_UNION_TYPE:
      {
	tree field;

	for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
	  if (TREE_CODE (field) == FIELD_DECL
	      && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field))
		  || (TREE_CODE (type) == QUAL_UNION_TYPE
		      && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field)))
		  || type_contains_placeholder_p (TREE_TYPE (field))))
	    return true;

	return false;
      }

    default:
      gcc_unreachable ();
    }
}

/* Wrapper around above function used to cache its result.  */

bool
type_contains_placeholder_p (tree type)
{
  bool result;

  /* If the contains_placeholder_bits field has been initialized,
     then we know the answer.  */
  if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) > 0)
    return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) - 1;

  /* Indicate that we've seen this type node, and the answer is false.
     This is what we want to return if we run into recursion via fields.  */
  TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) = 1;

  /* Compute the real value.  */
  result = type_contains_placeholder_1 (type);

  /* Store the real value.  */
  TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) = result + 1;

  return result;
}

/* Push tree EXP onto vector QUEUE if it is not already present.  */

static void
push_without_duplicates (tree exp, vec<tree> *queue)
{
  unsigned int i;
  tree iter;

  FOR_EACH_VEC_ELT (*queue, i, iter)
    if (simple_cst_equal (iter, exp) == 1)
      break;

  if (!iter)
    queue->safe_push (exp);
}

/* Given a tree EXP, find all occurrences of references to fields
   in a PLACEHOLDER_EXPR and place them in vector REFS without
   duplicates.  Also record VAR_DECLs and CONST_DECLs.  Note that
   we assume here that EXP contains only arithmetic expressions
   or CALL_EXPRs with PLACEHOLDER_EXPRs occurring only in their
   argument list.  */

void
find_placeholder_in_expr (tree exp, vec<tree> *refs)
{
  enum tree_code code = TREE_CODE (exp);
  tree inner;
  int i;

  /* We handle TREE_LIST and COMPONENT_REF separately.  */
  if (code == TREE_LIST)
    {
      FIND_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), refs);
      FIND_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), refs);
    }
  else if (code == COMPONENT_REF)
    {
      for (inner = TREE_OPERAND (exp, 0);
	   REFERENCE_CLASS_P (inner);
	   inner = TREE_OPERAND (inner, 0))
	;

      if (TREE_CODE (inner) == PLACEHOLDER_EXPR)
	push_without_duplicates (exp, refs);
      else
	FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), refs);
   }
  else
    switch (TREE_CODE_CLASS (code))
      {
      case tcc_constant:
	break;

      case tcc_declaration:
	/* Variables allocated to static storage can stay.  */
        if (!TREE_STATIC (exp))
	  push_without_duplicates (exp, refs);
	break;

      case tcc_expression:
	/* This is the pattern built in ada/make_aligning_type.  */
	if (code == ADDR_EXPR
	    && TREE_CODE (TREE_OPERAND (exp, 0)) == PLACEHOLDER_EXPR)
	  {
	    push_without_duplicates (exp, refs);
	    break;
	  }

        /* Fall through...  */

      case tcc_exceptional:
      case tcc_unary:
      case tcc_binary:
      case tcc_comparison:
      case tcc_reference:
	for (i = 0; i < TREE_CODE_LENGTH (code); i++)
	  FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, i), refs);
	break;

      case tcc_vl_exp:
	for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
	  FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, i), refs);
	break;

      default:
	gcc_unreachable ();
      }
}

/* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
   return a tree with all occurrences of references to F in a
   PLACEHOLDER_EXPR replaced by R.  Also handle VAR_DECLs and
   CONST_DECLs.  Note that we assume here that EXP contains only
   arithmetic expressions or CALL_EXPRs with PLACEHOLDER_EXPRs
   occurring only in their argument list.  */

tree
substitute_in_expr (tree exp, tree f, tree r)
{
  enum tree_code code = TREE_CODE (exp);
  tree op0, op1, op2, op3;
  tree new_tree;

  /* We handle TREE_LIST and COMPONENT_REF separately.  */
  if (code == TREE_LIST)
    {
      op0 = SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp), f, r);
      op1 = SUBSTITUTE_IN_EXPR (TREE_VALUE (exp), f, r);
      if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
	return exp;

      return tree_cons (TREE_PURPOSE (exp), op1, op0);
    }
  else if (code == COMPONENT_REF)
    {
      tree inner;

      /* If this expression is getting a value from a PLACEHOLDER_EXPR
	 and it is the right field, replace it with R.  */
      for (inner = TREE_OPERAND (exp, 0);
	   REFERENCE_CLASS_P (inner);
	   inner = TREE_OPERAND (inner, 0))
	;

      /* The field.  */
      op1 = TREE_OPERAND (exp, 1);

      if (TREE_CODE (inner) == PLACEHOLDER_EXPR && op1 == f)
	return r;

      /* If this expression hasn't been completed let, leave it alone.  */
      if (TREE_CODE (inner) == PLACEHOLDER_EXPR && !TREE_TYPE (inner))
	return exp;

      op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
      if (op0 == TREE_OPERAND (exp, 0))
	return exp;

      new_tree
	= fold_build3 (COMPONENT_REF, TREE_TYPE (exp), op0, op1, NULL_TREE);
   }
  else
    switch (TREE_CODE_CLASS (code))
      {
      case tcc_constant:
	return exp;

      case tcc_declaration:
	if (exp == f)
	  return r;
	else
	  return exp;

      case tcc_expression:
	if (exp == f)
	  return r;

        /* Fall through...  */

      case tcc_exceptional:
      case tcc_unary:
      case tcc_binary:
      case tcc_comparison:
      case tcc_reference:
	switch (TREE_CODE_LENGTH (code))
	  {
	  case 0:
	    return exp;

	  case 1:
	    op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
	    if (op0 == TREE_OPERAND (exp, 0))
	      return exp;

	    new_tree = fold_build1 (code, TREE_TYPE (exp), op0);
	    break;

	  case 2:
	    op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
	    op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);

	    if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
	      return exp;

	    new_tree = fold_build2 (code, TREE_TYPE (exp), op0, op1);
	    break;

	  case 3:
	    op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
	    op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
	    op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);

	    if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
		&& op2 == TREE_OPERAND (exp, 2))
	      return exp;

	    new_tree = fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
	    break;

	  case 4:
	    op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
	    op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
	    op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
	    op3 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 3), f, r);

	    if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
		&& op2 == TREE_OPERAND (exp, 2)
		&& op3 == TREE_OPERAND (exp, 3))
	      return exp;

	    new_tree
	      = fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
	    break;

	  default:
	    gcc_unreachable ();
	  }
	break;

      case tcc_vl_exp:
	{
	  int i;

	  new_tree = NULL_TREE;

	  /* If we are trying to replace F with a constant, inline back
	     functions which do nothing else than computing a value from
	     the arguments they are passed.  This makes it possible to
	     fold partially or entirely the replacement expression.  */
	  if (CONSTANT_CLASS_P (r) && code == CALL_EXPR)
	    {
	      tree t = maybe_inline_call_in_expr (exp);
	      if (t)
		return SUBSTITUTE_IN_EXPR (t, f, r);
	    }

	  for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
	    {
	      tree op = TREE_OPERAND (exp, i);
	      tree new_op = SUBSTITUTE_IN_EXPR (op, f, r);
	      if (new_op != op)
		{
		  if (!new_tree)
		    new_tree = copy_node (exp);
		  TREE_OPERAND (new_tree, i) = new_op;
		}
	    }

	  if (new_tree)
	    {
	      new_tree = fold (new_tree);
	      if (TREE_CODE (new_tree) == CALL_EXPR)
		process_call_operands (new_tree);
	    }
	  else
	    return exp;
	}
	break;

      default:
	gcc_unreachable ();
      }

  TREE_READONLY (new_tree) |= TREE_READONLY (exp);

  if (code == INDIRECT_REF || code == ARRAY_REF || code == ARRAY_RANGE_REF)
    TREE_THIS_NOTRAP (new_tree) |= TREE_THIS_NOTRAP (exp);

  return new_tree;
}

/* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
   for it within OBJ, a tree that is an object or a chain of references.  */

tree
substitute_placeholder_in_expr (tree exp, tree obj)
{
  enum tree_code code = TREE_CODE (exp);
  tree op0, op1, op2, op3;
  tree new_tree;

  /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
     in the chain of OBJ.  */
  if (code == PLACEHOLDER_EXPR)
    {
      tree need_type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
      tree elt;

      for (elt = obj; elt != 0;
	   elt = ((TREE_CODE (elt) == COMPOUND_EXPR
		   || TREE_CODE (elt) == COND_EXPR)
		  ? TREE_OPERAND (elt, 1)
		  : (REFERENCE_CLASS_P (elt)
		     || UNARY_CLASS_P (elt)
		     || BINARY_CLASS_P (elt)
		     || VL_EXP_CLASS_P (elt)
		     || EXPRESSION_CLASS_P (elt))
		  ? TREE_OPERAND (elt, 0) : 0))
	if (TYPE_MAIN_VARIANT (TREE_TYPE (elt)) == need_type)
	  return elt;

      for (elt = obj; elt != 0;
	   elt = ((TREE_CODE (elt) == COMPOUND_EXPR
		   || TREE_CODE (elt) == COND_EXPR)
		  ? TREE_OPERAND (elt, 1)
		  : (REFERENCE_CLASS_P (elt)
		     || UNARY_CLASS_P (elt)
		     || BINARY_CLASS_P (elt)
		     || VL_EXP_CLASS_P (elt)
		     || EXPRESSION_CLASS_P (elt))
		  ? TREE_OPERAND (elt, 0) : 0))
	if (POINTER_TYPE_P (TREE_TYPE (elt))
	    && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt)))
		== need_type))
	  return fold_build1 (INDIRECT_REF, need_type, elt);

      /* If we didn't find it, return the original PLACEHOLDER_EXPR.  If it
	 survives until RTL generation, there will be an error.  */
      return exp;
    }

  /* TREE_LIST is special because we need to look at TREE_VALUE
     and TREE_CHAIN, not TREE_OPERANDS.  */
  else if (code == TREE_LIST)
    {
      op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), obj);
      op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), obj);
      if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
	return exp;

      return tree_cons (TREE_PURPOSE (exp), op1, op0);
    }
  else
    switch (TREE_CODE_CLASS (code))
      {
      case tcc_constant:
      case tcc_declaration:
	return exp;

      case tcc_exceptional:
      case tcc_unary:
      case tcc_binary:
      case tcc_comparison:
      case tcc_expression:
      case tcc_reference:
      case tcc_statement:
	switch (TREE_CODE_LENGTH (code))
	  {
	  case 0:
	    return exp;

	  case 1:
	    op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
	    if (op0 == TREE_OPERAND (exp, 0))
	      return exp;

	    new_tree = fold_build1 (code, TREE_TYPE (exp), op0);
	    break;

	  case 2:
	    op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
	    op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);

	    if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
	      return exp;

	    new_tree = fold_build2 (code, TREE_TYPE (exp), op0, op1);
	    break;

	  case 3:
	    op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
	    op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
	    op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);

	    if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
		&& op2 == TREE_OPERAND (exp, 2))
	      return exp;

	    new_tree = fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
	    break;

	  case 4:
	    op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
	    op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
	    op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
	    op3 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 3), obj);

	    if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
		&& op2 == TREE_OPERAND (exp, 2)
		&& op3 == TREE_OPERAND (exp, 3))
	      return exp;

	    new_tree
	      = fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
	    break;

	  default:
	    gcc_unreachable ();
	  }
	break;

      case tcc_vl_exp:
	{
	  int i;

	  new_tree = NULL_TREE;

	  for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
	    {
	      tree op = TREE_OPERAND (exp, i);
	      tree new_op = SUBSTITUTE_PLACEHOLDER_IN_EXPR (op, obj);
	      if (new_op != op)
		{
		  if (!new_tree)
		    new_tree = copy_node (exp);
		  TREE_OPERAND (new_tree, i) = new_op;
		}
	    }

	  if (new_tree)
	    {
	      new_tree = fold (new_tree);
	      if (TREE_CODE (new_tree) == CALL_EXPR)
		process_call_operands (new_tree);
	    }
	  else
	    return exp;
	}
	break;

      default:
	gcc_unreachable ();
      }

  TREE_READONLY (new_tree) |= TREE_READONLY (exp);

  if (code == INDIRECT_REF || code == ARRAY_REF || code == ARRAY_RANGE_REF)
    TREE_THIS_NOTRAP (new_tree) |= TREE_THIS_NOTRAP (exp);

  return new_tree;
}


/* Subroutine of stabilize_reference; this is called for subtrees of
   references.  Any expression with side-effects must be put in a SAVE_EXPR
   to ensure that it is only evaluated once.

   We don't put SAVE_EXPR nodes around everything, because assigning very
   simple expressions to temporaries causes us to miss good opportunities
   for optimizations.  Among other things, the opportunity to fold in the
   addition of a constant into an addressing mode often gets lost, e.g.
   "y[i+1] += x;".  In general, we take the approach that we should not make
   an assignment unless we are forced into it - i.e., that any non-side effect
   operator should be allowed, and that cse should take care of coalescing
   multiple utterances of the same expression should that prove fruitful.  */

static tree
stabilize_reference_1 (tree e)
{
  tree result;
  enum tree_code code = TREE_CODE (e);

  /* We cannot ignore const expressions because it might be a reference
     to a const array but whose index contains side-effects.  But we can
     ignore things that are actual constant or that already have been
     handled by this function.  */

  if (tree_invariant_p (e))
    return e;

  switch (TREE_CODE_CLASS (code))
    {
    case tcc_exceptional:
    case tcc_type:
    case tcc_declaration:
    case tcc_comparison:
    case tcc_statement:
    case tcc_expression:
    case tcc_reference:
    case tcc_vl_exp:
      /* If the expression has side-effects, then encase it in a SAVE_EXPR
	 so that it will only be evaluated once.  */
      /* The reference (r) and comparison (<) classes could be handled as
	 below, but it is generally faster to only evaluate them once.  */
      if (TREE_SIDE_EFFECTS (e))
	return save_expr (e);
      return e;

    case tcc_constant:
      /* Constants need no processing.  In fact, we should never reach
	 here.  */
      return e;

    case tcc_binary:
      /* Division is slow and tends to be compiled with jumps,
	 especially the division by powers of 2 that is often
	 found inside of an array reference.  So do it just once.  */
      if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
	  || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
	  || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
	  || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
	return save_expr (e);
      /* Recursively stabilize each operand.  */
      result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
			 stabilize_reference_1 (TREE_OPERAND (e, 1)));
      break;

    case tcc_unary:
      /* Recursively stabilize each operand.  */
      result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
      break;

    default:
      gcc_unreachable ();
    }

  TREE_TYPE (result) = TREE_TYPE (e);
  TREE_READONLY (result) = TREE_READONLY (e);
  TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
  TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);

  return result;
}

/* Stabilize a reference so that we can use it any number of times
   without causing its operands to be evaluated more than once.
   Returns the stabilized reference.  This works by means of save_expr,
   so see the caveats in the comments about save_expr.

   Also allows conversion expressions whose operands are references.
   Any other kind of expression is returned unchanged.  */

tree
stabilize_reference (tree ref)
{
  tree result;
  enum tree_code code = TREE_CODE (ref);

  switch (code)
    {
    case VAR_DECL:
    case PARM_DECL:
    case RESULT_DECL:
      /* No action is needed in this case.  */
      return ref;

    CASE_CONVERT:
    case FLOAT_EXPR:
    case FIX_TRUNC_EXPR:
      result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
      break;

    case INDIRECT_REF:
      result = build_nt (INDIRECT_REF,
			 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
      break;

    case COMPONENT_REF:
      result = build_nt (COMPONENT_REF,
			 stabilize_reference (TREE_OPERAND (ref, 0)),
			 TREE_OPERAND (ref, 1), NULL_TREE);
      break;

    case BIT_FIELD_REF:
      result = build_nt (BIT_FIELD_REF,
			 stabilize_reference (TREE_OPERAND (ref, 0)),
			 TREE_OPERAND (ref, 1), TREE_OPERAND (ref, 2));
      break;

    case ARRAY_REF:
      result = build_nt (ARRAY_REF,
			 stabilize_reference (TREE_OPERAND (ref, 0)),
			 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
			 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
      break;

    case ARRAY_RANGE_REF:
      result = build_nt (ARRAY_RANGE_REF,
			 stabilize_reference (TREE_OPERAND (ref, 0)),
			 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
			 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
      break;

    case COMPOUND_EXPR:
      /* We cannot wrap the first expression in a SAVE_EXPR, as then
	 it wouldn't be ignored.  This matters when dealing with
	 volatiles.  */
      return stabilize_reference_1 (ref);

      /* If arg isn't a kind of lvalue we recognize, make no change.
	 Caller should recognize the error for an invalid lvalue.  */
    default:
      return ref;

    case ERROR_MARK:
      return error_mark_node;
    }

  TREE_TYPE (result) = TREE_TYPE (ref);
  TREE_READONLY (result) = TREE_READONLY (ref);
  TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
  TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);

  return result;
}

/* Low-level constructors for expressions.  */

/* A helper function for build1 and constant folders.  Set TREE_CONSTANT,
   and TREE_SIDE_EFFECTS for an ADDR_EXPR.  */

void
recompute_tree_invariant_for_addr_expr (tree t)
{
  tree node;
  bool tc = true, se = false;

  /* We started out assuming this address is both invariant and constant, but
     does not have side effects.  Now go down any handled components and see if
     any of them involve offsets that are either non-constant or non-invariant.
     Also check for side-effects.

     ??? Note that this code makes no attempt to deal with the case where
     taking the address of something causes a copy due to misalignment.  */

#define UPDATE_FLAGS(NODE)  \
do { tree _node = (NODE); \
     if (_node && !TREE_CONSTANT (_node)) tc = false; \
     if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)

  for (node = TREE_OPERAND (t, 0); handled_component_p (node);
       node = TREE_OPERAND (node, 0))
    {
      /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
	 array reference (probably made temporarily by the G++ front end),
	 so ignore all the operands.  */
      if ((TREE_CODE (node) == ARRAY_REF
	   || TREE_CODE (node) == ARRAY_RANGE_REF)
	  && TREE_CODE (TREE_TYPE (TREE_OPERAND (node, 0))) == ARRAY_TYPE)
	{
	  UPDATE_FLAGS (TREE_OPERAND (node, 1));
	  if (TREE_OPERAND (node, 2))
	    UPDATE_FLAGS (TREE_OPERAND (node, 2));
	  if (TREE_OPERAND (node, 3))
	    UPDATE_FLAGS (TREE_OPERAND (node, 3));
	}
      /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
	 FIELD_DECL, apparently.  The G++ front end can put something else
	 there, at least temporarily.  */
      else if (TREE_CODE (node) == COMPONENT_REF
	       && TREE_CODE (TREE_OPERAND (node, 1)) == FIELD_DECL)
	{
	  if (TREE_OPERAND (node, 2))
	    UPDATE_FLAGS (TREE_OPERAND (node, 2));
	}
    }

  node = lang_hooks.expr_to_decl (node, &tc, &se);

  /* Now see what's inside.  If it's an INDIRECT_REF, copy our properties from
     the address, since &(*a)->b is a form of addition.  If it's a constant, the
     address is constant too.  If it's a decl, its address is constant if the
     decl is static.  Everything else is not constant and, furthermore,
     taking the address of a volatile variable is not volatile.  */
  if (TREE_CODE (node) == INDIRECT_REF
      || TREE_CODE (node) == MEM_REF)
    UPDATE_FLAGS (TREE_OPERAND (node, 0));
  else if (CONSTANT_CLASS_P (node))
    ;
  else if (DECL_P (node))
    tc &= (staticp (node) != NULL_TREE);
  else
    {
      tc = false;
      se |= TREE_SIDE_EFFECTS (node);
    }


  TREE_CONSTANT (t) = tc;
  TREE_SIDE_EFFECTS (t) = se;
#undef UPDATE_FLAGS
}

/* Build an expression of code CODE, data type TYPE, and operands as
   specified.  Expressions and reference nodes can be created this way.
   Constants, decls, types and misc nodes cannot be.

   We define 5 non-variadic functions, from 0 to 4 arguments.  This is
   enough for all extant tree codes.  */

tree
build0_stat (enum tree_code code, tree tt MEM_STAT_DECL)
{
  tree t;

  gcc_assert (TREE_CODE_LENGTH (code) == 0);

  t = make_node_stat (code PASS_MEM_STAT);
  TREE_TYPE (t) = tt;

  return t;
}

tree
build1_stat (enum tree_code code, tree type, tree node MEM_STAT_DECL)
{
  int length = sizeof (struct tree_exp);
  tree t;

  record_node_allocation_statistics (code, length);

  gcc_assert (TREE_CODE_LENGTH (code) == 1);

  t = ggc_alloc_tree_node_stat (length PASS_MEM_STAT);

  memset (t, 0, sizeof (struct tree_common));

  TREE_SET_CODE (t, code);

  TREE_TYPE (t) = type;
  SET_EXPR_LOCATION (t, UNKNOWN_LOCATION);
  TREE_OPERAND (t, 0) = node;
  if (node && !TYPE_P (node))
    {
      TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (node);
      TREE_READONLY (t) = TREE_READONLY (node);
    }

  if (TREE_CODE_CLASS (code) == tcc_statement)
    TREE_SIDE_EFFECTS (t) = 1;
  else switch (code)
    {
    case VA_ARG_EXPR:
      /* All of these have side-effects, no matter what their
	 operands are.  */
      TREE_SIDE_EFFECTS (t) = 1;
      TREE_READONLY (t) = 0;
      break;

    case INDIRECT_REF:
      /* Whether a dereference is readonly has nothing to do with whether
	 its operand is readonly.  */
      TREE_READONLY (t) = 0;
      break;

    case ADDR_EXPR:
      if (node)
	recompute_tree_invariant_for_addr_expr (t);
      break;

    default:
      if ((TREE_CODE_CLASS (code) == tcc_unary || code == VIEW_CONVERT_EXPR)
	  && node && !TYPE_P (node)
	  && TREE_CONSTANT (node))
	TREE_CONSTANT (t) = 1;
      if (TREE_CODE_CLASS (code) == tcc_reference
	  && node && TREE_THIS_VOLATILE (node))
	TREE_THIS_VOLATILE (t) = 1;
      break;
    }

  return t;
}

#define PROCESS_ARG(N)				\
  do {						\
    TREE_OPERAND (t, N) = arg##N;		\
    if (arg##N &&!TYPE_P (arg##N))		\
      {						\
        if (TREE_SIDE_EFFECTS (arg##N))		\
	  side_effects = 1;			\
        if (!TREE_READONLY (arg##N)		\
	    && !CONSTANT_CLASS_P (arg##N))	\
	  (void) (read_only = 0);		\
        if (!TREE_CONSTANT (arg##N))		\
	  (void) (constant = 0);		\
      }						\
  } while (0)

tree
build2_stat (enum tree_code code, tree tt, tree arg0, tree arg1 MEM_STAT_DECL)
{
  bool constant, read_only, side_effects;
  tree t;

  gcc_assert (TREE_CODE_LENGTH (code) == 2);

  if ((code == MINUS_EXPR || code == PLUS_EXPR || code == MULT_EXPR)
      && arg0 && arg1 && tt && POINTER_TYPE_P (tt)
      /* When sizetype precision doesn't match that of pointers
         we need to be able to build explicit extensions or truncations
	 of the offset argument.  */
      && TYPE_PRECISION (sizetype) == TYPE_PRECISION (tt))
    gcc_assert (TREE_CODE (arg0) == INTEGER_CST
		&& TREE_CODE (arg1) == INTEGER_CST);

  if (code == POINTER_PLUS_EXPR && arg0 && arg1 && tt)
    gcc_assert (POINTER_TYPE_P (tt) && POINTER_TYPE_P (TREE_TYPE (arg0))
		&& ptrofftype_p (TREE_TYPE (arg1)));

  t = make_node_stat (code PASS_MEM_STAT);
  TREE_TYPE (t) = tt;

  /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
     result based on those same flags for the arguments.  But if the
     arguments aren't really even `tree' expressions, we shouldn't be trying
     to do this.  */

  /* Expressions without side effects may be constant if their
     arguments are as well.  */
  constant = (TREE_CODE_CLASS (code) == tcc_comparison
	      || TREE_CODE_CLASS (code) == tcc_binary);
  read_only = 1;
  side_effects = TREE_SIDE_EFFECTS (t);

  PROCESS_ARG (0);
  PROCESS_ARG (1);

  TREE_SIDE_EFFECTS (t) = side_effects;
  if (code == MEM_REF)
    {
      if (arg0 && TREE_CODE (arg0) == ADDR_EXPR)
	{
	  tree o = TREE_OPERAND (arg0, 0);
	  TREE_READONLY (t) = TREE_READONLY (o);
	  TREE_THIS_VOLATILE (t) = TREE_THIS_VOLATILE (o);
	}
    }
  else
    {
      TREE_READONLY (t) = read_only;
      TREE_CONSTANT (t) = constant;
      TREE_THIS_VOLATILE (t)
	= (TREE_CODE_CLASS (code) == tcc_reference
	   && arg0 && TREE_THIS_VOLATILE (arg0));
    }

  return t;
}


tree
build3_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
	     tree arg2 MEM_STAT_DECL)
{
  bool constant, read_only, side_effects;
  tree t;

  gcc_assert (TREE_CODE_LENGTH (code) == 3);
  gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);

  t = make_node_stat (code PASS_MEM_STAT);
  TREE_TYPE (t) = tt;

  read_only = 1;

  /* As a special exception, if COND_EXPR has NULL branches, we
     assume that it is a gimple statement and always consider
     it to have side effects.  */
  if (code == COND_EXPR
      && tt == void_type_node
      && arg1 == NULL_TREE
      && arg2 == NULL_TREE)
    side_effects = true;
  else
    side_effects = TREE_SIDE_EFFECTS (t);

  PROCESS_ARG (0);
  PROCESS_ARG (1);
  PROCESS_ARG (2);

  if (code == COND_EXPR)
    TREE_READONLY (t) = read_only;

  TREE_SIDE_EFFECTS (t) = side_effects;
  TREE_THIS_VOLATILE (t)
    = (TREE_CODE_CLASS (code) == tcc_reference
       && arg0 && TREE_THIS_VOLATILE (arg0));

  return t;
}

tree
build4_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
	     tree arg2, tree arg3 MEM_STAT_DECL)
{
  bool constant, read_only, side_effects;
  tree t;

  gcc_assert (TREE_CODE_LENGTH (code) == 4);

  t = make_node_stat (code PASS_MEM_STAT);
  TREE_TYPE (t) = tt;

  side_effects = TREE_SIDE_EFFECTS (t);

  PROCESS_ARG (0);
  PROCESS_ARG (1);
  PROCESS_ARG (2);
  PROCESS_ARG (3);

  TREE_SIDE_EFFECTS (t) = side_effects;
  TREE_THIS_VOLATILE (t)
    = (TREE_CODE_CLASS (code) == tcc_reference
       && arg0 && TREE_THIS_VOLATILE (arg0));

  return t;
}

tree
build5_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
	     tree arg2, tree arg3, tree arg4 MEM_STAT_DECL)
{
  bool constant, read_only, side_effects;
  tree t;

  gcc_assert (TREE_CODE_LENGTH (code) == 5);

  t = make_node_stat (code PASS_MEM_STAT);
  TREE_TYPE (t) = tt;

  side_effects = TREE_SIDE_EFFECTS (t);

  PROCESS_ARG (0);
  PROCESS_ARG (1);
  PROCESS_ARG (2);
  PROCESS_ARG (3);
  PROCESS_ARG (4);

  TREE_SIDE_EFFECTS (t) = side_effects;
  if (code == TARGET_MEM_REF)
    {
      if (arg0 && TREE_CODE (arg0) == ADDR_EXPR)
	{
	  tree o = TREE_OPERAND (arg0, 0);
	  TREE_READONLY (t) = TREE_READONLY (o);
	  TREE_THIS_VOLATILE (t) = TREE_THIS_VOLATILE (o);
	}
    }
  else
    TREE_THIS_VOLATILE (t)
      = (TREE_CODE_CLASS (code) == tcc_reference
	 && arg0 && TREE_THIS_VOLATILE (arg0));

  return t;
}

/* Build a simple MEM_REF tree with the sematics of a plain INDIRECT_REF
   on the pointer PTR.  */

tree
build_simple_mem_ref_loc (location_t loc, tree ptr)
{
  HOST_WIDE_INT offset = 0;
  tree ptype = TREE_TYPE (ptr);
  tree tem;
  /* For convenience allow addresses that collapse to a simple base
     and offset.  */
  if (TREE_CODE (ptr) == ADDR_EXPR
      && (handled_component_p (TREE_OPERAND (ptr, 0))
	  || TREE_CODE (TREE_OPERAND (ptr, 0)) == MEM_REF))
    {
      ptr = get_addr_base_and_unit_offset (TREE_OPERAND (ptr, 0), &offset);
      gcc_assert (ptr);
      ptr = build_fold_addr_expr (ptr);
      gcc_assert (is_gimple_reg (ptr) || is_gimple_min_invariant (ptr));
    }
  tem = build2 (MEM_REF, TREE_TYPE (ptype),
		ptr, build_int_cst (ptype, offset));
  SET_EXPR_LOCATION (tem, loc);
  return tem;
}

/* Return the constant offset of a MEM_REF or TARGET_MEM_REF tree T.  */

offset_int
mem_ref_offset (const_tree t)
{
  return offset_int::from (TREE_OPERAND (t, 1), SIGNED);
}

/* Return an invariant ADDR_EXPR of type TYPE taking the address of BASE
   offsetted by OFFSET units.  */

tree
build_invariant_address (tree type, tree base, HOST_WIDE_INT offset)
{
  tree ref = fold_build2 (MEM_REF, TREE_TYPE (type),
			  build_fold_addr_expr (base),
			  build_int_cst (ptr_type_node, offset));
  tree addr = build1 (ADDR_EXPR, type, ref);
  recompute_tree_invariant_for_addr_expr (addr);
  return addr;
}

/* Similar except don't specify the TREE_TYPE
   and leave the TREE_SIDE_EFFECTS as 0.
   It is permissible for arguments to be null,
   or even garbage if their values do not matter.  */

tree
build_nt (enum tree_code code, ...)
{
  tree t;
  int length;
  int i;
  va_list p;

  gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);

  va_start (p, code);

  t = make_node (code);
  length = TREE_CODE_LENGTH (code);

  for (i = 0; i < length; i++)
    TREE_OPERAND (t, i) = va_arg (p, tree);

  va_end (p);
  return t;
}

/* Similar to build_nt, but for creating a CALL_EXPR object with a
   tree vec.  */

tree
build_nt_call_vec (tree fn, vec<tree, va_gc> *args)
{
  tree ret, t;
  unsigned int ix;

  ret = build_vl_exp (CALL_EXPR, vec_safe_length (args) + 3);
  CALL_EXPR_FN (ret) = fn;
  CALL_EXPR_STATIC_CHAIN (ret) = NULL_TREE;
  FOR_EACH_VEC_SAFE_ELT (args, ix, t)
    CALL_EXPR_ARG (ret, ix) = t;
  return ret;
}

/* Create a DECL_... node of code CODE, name NAME and data type TYPE.
   We do NOT enter this node in any sort of symbol table.

   LOC is the location of the decl.

   layout_decl is used to set up the decl's storage layout.
   Other slots are initialized to 0 or null pointers.  */

tree
build_decl_stat (location_t loc, enum tree_code code, tree name,
    		 tree type MEM_STAT_DECL)
{
  tree t;

  t = make_node_stat (code PASS_MEM_STAT);
  DECL_SOURCE_LOCATION (t) = loc;

/*  if (type == error_mark_node)
    type = integer_type_node; */
/* That is not done, deliberately, so that having error_mark_node
   as the type can suppress useless errors in the use of this variable.  */

  DECL_NAME (t) = name;
  TREE_TYPE (t) = type;

  if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
    layout_decl (t, 0);

  return t;
}

/* Builds and returns function declaration with NAME and TYPE.  */

tree
build_fn_decl (const char *name, tree type)
{
  tree id = get_identifier (name);
  tree decl = build_decl (input_location, FUNCTION_DECL, id, type);

  DECL_EXTERNAL (decl) = 1;
  TREE_PUBLIC (decl) = 1;
  DECL_ARTIFICIAL (decl) = 1;
  TREE_NOTHROW (decl) = 1;

  return decl;
}

vec<tree, va_gc> *all_translation_units;

/* Builds a new translation-unit decl with name NAME, queues it in the
   global list of translation-unit decls and returns it.   */

tree
build_translation_unit_decl (tree name)
{
  tree tu = build_decl (UNKNOWN_LOCATION, TRANSLATION_UNIT_DECL,
			name, NULL_TREE);
  TRANSLATION_UNIT_LANGUAGE (tu) = lang_hooks.name;
  vec_safe_push (all_translation_units, tu);
  return tu;
}


/* BLOCK nodes are used to represent the structure of binding contours
   and declarations, once those contours have been exited and their contents
   compiled.  This information is used for outputting debugging info.  */

tree
build_block (tree vars, tree subblocks, tree supercontext, tree chain)
{
  tree block = make_node (BLOCK);

  BLOCK_VARS (block) = vars;
  BLOCK_SUBBLOCKS (block) = subblocks;
  BLOCK_SUPERCONTEXT (block) = supercontext;
  BLOCK_CHAIN (block) = chain;
  return block;
}


/* Like SET_EXPR_LOCATION, but make sure the tree can have a location.

   LOC is the location to use in tree T.  */

void
protected_set_expr_location (tree t, location_t loc)
{
  if (CAN_HAVE_LOCATION_P (t))
    SET_EXPR_LOCATION (t, loc);
}

/* Return a declaration like DDECL except that its DECL_ATTRIBUTES
   is ATTRIBUTE.  */

tree
build_decl_attribute_variant (tree ddecl, tree attribute)
{
  DECL_ATTRIBUTES (ddecl) = attribute;
  return ddecl;
}

/* Return a type like TTYPE except that its TYPE_ATTRIBUTE
   is ATTRIBUTE and its qualifiers are QUALS.

   Record such modified types already made so we don't make duplicates.  */

tree
build_type_attribute_qual_variant (tree ttype, tree attribute, int quals)
{
  if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
    {
      inchash::hash hstate;
      tree ntype;
      int i;
      tree t;
      enum tree_code code = TREE_CODE (ttype);

      /* Building a distinct copy of a tagged type is inappropriate; it
	 causes breakage in code that expects there to be a one-to-one
	 relationship between a struct and its fields.
	 build_duplicate_type is another solution (as used in
	 handle_transparent_union_attribute), but that doesn't play well
	 with the stronger C++ type identity model.  */
      if (TREE_CODE (ttype) == RECORD_TYPE
	  || TREE_CODE (ttype) == UNION_TYPE
	  || TREE_CODE (ttype) == QUAL_UNION_TYPE
	  || TREE_CODE (ttype) == ENUMERAL_TYPE)
	{
	  warning (OPT_Wattributes,
		   "ignoring attributes applied to %qT after definition",
		   TYPE_MAIN_VARIANT (ttype));
	  return build_qualified_type (ttype, quals);
	}

      ttype = build_qualified_type (ttype, TYPE_UNQUALIFIED);
      ntype = build_distinct_type_copy (ttype);

      TYPE_ATTRIBUTES (ntype) = attribute;

      hstate.add_int (code);
      if (TREE_TYPE (ntype))
	hstate.add_object (TYPE_HASH (TREE_TYPE (ntype)));
      attribute_hash_list (attribute, hstate);

      switch (TREE_CODE (ntype))
	{
	case FUNCTION_TYPE:
	  type_hash_list (TYPE_ARG_TYPES (ntype), hstate);
	  break;
	case ARRAY_TYPE:
	  if (TYPE_DOMAIN (ntype))
	    hstate.add_object (TYPE_HASH (TYPE_DOMAIN (ntype)));
	  break;
	case INTEGER_TYPE:
	  t = TYPE_MAX_VALUE (ntype);
	  for (i = 0; i < TREE_INT_CST_NUNITS (t); i++)
	    hstate.add_object (TREE_INT_CST_ELT (t, i));
	  break;
	case REAL_TYPE:
	case FIXED_POINT_TYPE:
	  {
	    unsigned int precision = TYPE_PRECISION (ntype);
	    hstate.add_object (precision);
	  }
	  break;
	default:
	  break;
	}

      ntype = type_hash_canon (hstate.end(), ntype);

      /* If the target-dependent attributes make NTYPE different from
	 its canonical type, we will need to use structural equality
	 checks for this type. */
      if (TYPE_STRUCTURAL_EQUALITY_P (ttype)
          || !comp_type_attributes (ntype, ttype))
	SET_TYPE_STRUCTURAL_EQUALITY (ntype);
      else if (TYPE_CANONICAL (ntype) == ntype)
	TYPE_CANONICAL (ntype) = TYPE_CANONICAL (ttype);

      ttype = build_qualified_type (ntype, quals);
    }
  else if (TYPE_QUALS (ttype) != quals)
    ttype = build_qualified_type (ttype, quals);

  return ttype;
}

/* Check if "omp declare simd" attribute arguments, CLAUSES1 and CLAUSES2, are
   the same.  */

static bool
omp_declare_simd_clauses_equal (tree clauses1, tree clauses2)
{
  tree cl1, cl2;
  for (cl1 = clauses1, cl2 = clauses2;
       cl1 && cl2;
       cl1 = OMP_CLAUSE_CHAIN (cl1), cl2 = OMP_CLAUSE_CHAIN (cl2))
    {
      if (OMP_CLAUSE_CODE (cl1) != OMP_CLAUSE_CODE (cl2))
	return false;
      if (OMP_CLAUSE_CODE (cl1) != OMP_CLAUSE_SIMDLEN)
	{
	  if (simple_cst_equal (OMP_CLAUSE_DECL (cl1),
				OMP_CLAUSE_DECL (cl2)) != 1)
	    return false;
	}
      switch (OMP_CLAUSE_CODE (cl1))
	{
	case OMP_CLAUSE_ALIGNED:
	  if (simple_cst_equal (OMP_CLAUSE_ALIGNED_ALIGNMENT (cl1),
				OMP_CLAUSE_ALIGNED_ALIGNMENT (cl2)) != 1)
	    return false;
	  break;
	case OMP_CLAUSE_LINEAR:
	  if (simple_cst_equal (OMP_CLAUSE_LINEAR_STEP (cl1),
				OMP_CLAUSE_LINEAR_STEP (cl2)) != 1)
	    return false;
	  break;
	case OMP_CLAUSE_SIMDLEN:
	  if (simple_cst_equal (OMP_CLAUSE_SIMDLEN_EXPR (cl1),
				OMP_CLAUSE_SIMDLEN_EXPR (cl2)) != 1)
	    return false;
	default:
	  break;
	}
    }
  return true;
}

/* Compare two constructor-element-type constants.  Return 1 if the lists
   are known to be equal; otherwise return 0.  */

static bool
simple_cst_list_equal (const_tree l1, const_tree l2)
{
  while (l1 != NULL_TREE && l2 != NULL_TREE)
    {
      if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
	return false;

      l1 = TREE_CHAIN (l1);
      l2 = TREE_CHAIN (l2);
    }

  return l1 == l2;
}

/* Compare two identifier nodes representing attributes.  Either one may
   be in wrapped __ATTR__ form.  Return true if they are the same, false
   otherwise.  */

static bool
cmp_attrib_identifiers (const_tree attr1, const_tree attr2)
{
  /* Make sure we're dealing with IDENTIFIER_NODEs.  */
  gcc_checking_assert (TREE_CODE (attr1) == IDENTIFIER_NODE
		       && TREE_CODE (attr2) == IDENTIFIER_NODE);

  /* Identifiers can be compared directly for equality.  */
  if (attr1 == attr2)
    return true;

  /* If they are not equal, they may still be one in the form
     'text' while the other one is in the form '__text__'.  TODO:
     If we were storing attributes in normalized 'text' form, then
     this could all go away and we could take full advantage of
     the fact that we're comparing identifiers. :-)  */
  const size_t attr1_len = IDENTIFIER_LENGTH (attr1);
  const size_t attr2_len = IDENTIFIER_LENGTH (attr2);

  if (attr2_len == attr1_len + 4)
    {
      const char *p = IDENTIFIER_POINTER (attr2);
      const char *q = IDENTIFIER_POINTER (attr1);
      if (p[0] == '_' && p[1] == '_'
	  && p[attr2_len - 2] == '_' && p[attr2_len - 1] == '_'
	  && strncmp (q, p + 2, attr1_len) == 0)
	return true;;
    }
  else if (attr2_len + 4 == attr1_len)
    {
      const char *p = IDENTIFIER_POINTER (attr2);
      const char *q = IDENTIFIER_POINTER (attr1);
      if (q[0] == '_' && q[1] == '_'
	  && q[attr1_len - 2] == '_' && q[attr1_len - 1] == '_'
	  && strncmp (q + 2, p, attr2_len) == 0)
	return true;
    }

  return false;
}

/* Compare two attributes for their value identity.  Return true if the
   attribute values are known to be equal; otherwise return false.  */

bool
attribute_value_equal (const_tree attr1, const_tree attr2)
{
  if (TREE_VALUE (attr1) == TREE_VALUE (attr2))
    return true;

  if (TREE_VALUE (attr1) != NULL_TREE
      && TREE_CODE (TREE_VALUE (attr1)) == TREE_LIST
      && TREE_VALUE (attr2) != NULL_TREE
      && TREE_CODE (TREE_VALUE (attr2)) == TREE_LIST)
    {
      /* Handle attribute format.  */
      if (is_attribute_p ("format", TREE_PURPOSE (attr1)))
	{
	  attr1 = TREE_VALUE (attr1);
	  attr2 = TREE_VALUE (attr2);
	  /* Compare the archetypes (printf/scanf/strftime/...).  */
	  if (!cmp_attrib_identifiers (TREE_VALUE (attr1),
				       TREE_VALUE (attr2)))
	    return false;
	  /* Archetypes are the same.  Compare the rest.  */
	  return (simple_cst_list_equal (TREE_CHAIN (attr1),
					 TREE_CHAIN (attr2)) == 1);
	}
      return (simple_cst_list_equal (TREE_VALUE (attr1),
				     TREE_VALUE (attr2)) == 1);
    }

  if ((flag_openmp || flag_openmp_simd)
      && TREE_VALUE (attr1) && TREE_VALUE (attr2)
      && TREE_CODE (TREE_VALUE (attr1)) == OMP_CLAUSE
      && TREE_CODE (TREE_VALUE (attr2)) == OMP_CLAUSE)
    return omp_declare_simd_clauses_equal (TREE_VALUE (attr1),
					   TREE_VALUE (attr2));

  return (simple_cst_equal (TREE_VALUE (attr1), TREE_VALUE (attr2)) == 1);
}

/* Return 0 if the attributes for two types are incompatible, 1 if they
   are compatible, and 2 if they are nearly compatible (which causes a
   warning to be generated).  */
int
comp_type_attributes (const_tree type1, const_tree type2)
{
  const_tree a1 = TYPE_ATTRIBUTES (type1);
  const_tree a2 = TYPE_ATTRIBUTES (type2);
  const_tree a;

  if (a1 == a2)
    return 1;
  for (a = a1; a != NULL_TREE; a = TREE_CHAIN (a))
    {
      const struct attribute_spec *as;
      const_tree attr;

      as = lookup_attribute_spec (get_attribute_name (a));
      if (!as || as->affects_type_identity == false)
        continue;

      attr = lookup_attribute (as->name, CONST_CAST_TREE (a2));
      if (!attr || !attribute_value_equal (a, attr))
        break;
    }
  if (!a)
    {
      for (a = a2; a != NULL_TREE; a = TREE_CHAIN (a))
	{
	  const struct attribute_spec *as;

	  as = lookup_attribute_spec (get_attribute_name (a));
	  if (!as || as->affects_type_identity == false)
	    continue;

	  if (!lookup_attribute (as->name, CONST_CAST_TREE (a1)))
	    break;
	  /* We don't need to compare trees again, as we did this
	     already in first loop.  */
	}
      /* All types - affecting identity - are equal, so
         there is no need to call target hook for comparison.  */
      if (!a)
        return 1;
    }
  /* As some type combinations - like default calling-convention - might
     be compatible, we have to call the target hook to get the final result.  */
  return targetm.comp_type_attributes (type1, type2);
}

/* Return a type like TTYPE except that its TYPE_ATTRIBUTE
   is ATTRIBUTE.

   Record such modified types already made so we don't make duplicates.  */

tree
build_type_attribute_variant (tree ttype, tree attribute)
{
  return build_type_attribute_qual_variant (ttype, attribute,
					    TYPE_QUALS (ttype));
}


/* Reset the expression *EXPR_P, a size or position.

   ??? We could reset all non-constant sizes or positions.  But it's cheap
   enough to not do so and refrain from adding workarounds to dwarf2out.c.

   We need to reset self-referential sizes or positions because they cannot
   be gimplified and thus can contain a CALL_EXPR after the gimplification
   is finished, which will run afoul of LTO streaming.  And they need to be
   reset to something essentially dummy but not constant, so as to preserve
   the properties of the object they are attached to.  */

static inline void
free_lang_data_in_one_sizepos (tree *expr_p)
{
  tree expr = *expr_p;
  if (CONTAINS_PLACEHOLDER_P (expr))
    *expr_p = build0 (PLACEHOLDER_EXPR, TREE_TYPE (expr));
}


/* Reset all the fields in a binfo node BINFO.  We only keep
   BINFO_VTABLE, which is used by gimple_fold_obj_type_ref.  */

static void
free_lang_data_in_binfo (tree binfo)
{
  unsigned i;
  tree t;

  gcc_assert (TREE_CODE (binfo) == TREE_BINFO);

  BINFO_VIRTUALS (binfo) = NULL_TREE;
  BINFO_BASE_ACCESSES (binfo) = NULL;
  BINFO_INHERITANCE_CHAIN (binfo) = NULL_TREE;
  BINFO_SUBVTT_INDEX (binfo) = NULL_TREE;

  FOR_EACH_VEC_ELT (*BINFO_BASE_BINFOS (binfo), i, t)
    free_lang_data_in_binfo (t);
}


/* Reset all language specific information still present in TYPE.  */

static void
free_lang_data_in_type (tree type)
{
  gcc_assert (TYPE_P (type));

  /* Give the FE a chance to remove its own data first.  */
  lang_hooks.free_lang_data (type);

  TREE_LANG_FLAG_0 (type) = 0;
  TREE_LANG_FLAG_1 (type) = 0;
  TREE_LANG_FLAG_2 (type) = 0;
  TREE_LANG_FLAG_3 (type) = 0;
  TREE_LANG_FLAG_4 (type) = 0;
  TREE_LANG_FLAG_5 (type) = 0;
  TREE_LANG_FLAG_6 (type) = 0;

  if (TREE_CODE (type) == FUNCTION_TYPE)
    {
      /* Remove the const and volatile qualifiers from arguments.  The
	 C++ front end removes them, but the C front end does not,
	 leading to false ODR violation errors when merging two
	 instances of the same function signature compiled by
	 different front ends.  */
      tree p;

      for (p = TYPE_ARG_TYPES (type); p; p = TREE_CHAIN (p))
	{
	  tree arg_type = TREE_VALUE (p);

	  if (TYPE_READONLY (arg_type) || TYPE_VOLATILE (arg_type))
	    {
	      int quals = TYPE_QUALS (arg_type)
			  & ~TYPE_QUAL_CONST
			  & ~TYPE_QUAL_VOLATILE;
	      TREE_VALUE (p) = build_qualified_type (arg_type, quals);
	      free_lang_data_in_type (TREE_VALUE (p));
	    }
	  /* C++ FE uses TREE_PURPOSE to store initial values.  */
	  TREE_PURPOSE (p) = NULL;
	}
      /* Java uses TYPE_MINVAL for TYPE_ARGUMENT_SIGNATURE.  */
      TYPE_MINVAL (type) = NULL;
    }
  if (TREE_CODE (type) == METHOD_TYPE)
    {
      tree p;

      for (p = TYPE_ARG_TYPES (type); p; p = TREE_CHAIN (p))
	{
	  /* C++ FE uses TREE_PURPOSE to store initial values.  */
	  TREE_PURPOSE (p) = NULL;
	}
      /* Java uses TYPE_MINVAL for TYPE_ARGUMENT_SIGNATURE.  */
      TYPE_MINVAL (type) = NULL;
    }

  /* Remove members that are not actually FIELD_DECLs from the field
     list of an aggregate.  These occur in C++.  */
  if (RECORD_OR_UNION_TYPE_P (type))
    {
      tree prev, member;

      /* Note that TYPE_FIELDS can be shared across distinct
	 TREE_TYPEs.  Therefore, if the first field of TYPE_FIELDS is
	 to be removed, we cannot set its TREE_CHAIN to NULL.
	 Otherwise, we would not be able to find all the other fields
	 in the other instances of this TREE_TYPE.

	 This was causing an ICE in testsuite/g++.dg/lto/20080915.C.  */
      prev = NULL_TREE;
      member = TYPE_FIELDS (type);
      while (member)
	{
	  if (TREE_CODE (member) == FIELD_DECL
	      || TREE_CODE (member) == TYPE_DECL)
	    {
	      if (prev)
		TREE_CHAIN (prev) = member;
	      else
		TYPE_FIELDS (type) = member;
	      prev = member;
	    }

	  member = TREE_CHAIN (member);
	}

      if (prev)
	TREE_CHAIN (prev) = NULL_TREE;
      else
	TYPE_FIELDS (type) = NULL_TREE;

      /* FIXME: C FE uses TYPE_VFIELD to record C_TYPE_INCOMPLETE_VARS
 	 and danagle the pointer from time to time.  */
      if (TYPE_VFIELD (type) && TREE_CODE (TYPE_VFIELD (type)) != FIELD_DECL)
        TYPE_VFIELD (type) = NULL_TREE;

      /* Remove TYPE_METHODS list.  While it would be nice to keep it
 	 to enable ODR warnings about different method lists, doing so
	 seems to impractically increase size of LTO data streamed.
	 Keep the infrmation if TYPE_METHODS was non-NULL. This is used
	 by function.c and pretty printers.  */
      if (TYPE_METHODS (type))
        TYPE_METHODS (type) = error_mark_node;
      if (TYPE_BINFO (type))
	{
	  free_lang_data_in_binfo (TYPE_BINFO (type));
	  /* We need to preserve link to bases and virtual table for all
	     polymorphic types to make devirtualization machinery working.
	     Debug output cares only about bases, but output also
	     virtual table pointers so merging of -fdevirtualize and
	     -fno-devirtualize units is easier.  */
	  if ((!BINFO_VTABLE (TYPE_BINFO (type))
	       || !flag_devirtualize)
	      && ((!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))
		   && !BINFO_VTABLE (TYPE_BINFO (type)))
		  || debug_info_level != DINFO_LEVEL_NONE))
	    TYPE_BINFO (type) = NULL;
	}
    }
  else
    {
      /* For non-aggregate types, clear out the language slot (which
	 overloads TYPE_BINFO).  */
      TYPE_LANG_SLOT_1 (type) = NULL_TREE;

      if (INTEGRAL_TYPE_P (type)
	  || SCALAR_FLOAT_TYPE_P (type)
	  || FIXED_POINT_TYPE_P (type))
	{
	  free_lang_data_in_one_sizepos (&TYPE_MIN_VALUE (type));
	  free_lang_data_in_one_sizepos (&TYPE_MAX_VALUE (type));
	}
    }

  free_lang_data_in_one_sizepos (&TYPE_SIZE (type));
  free_lang_data_in_one_sizepos (&TYPE_SIZE_UNIT (type));

  if (TYPE_CONTEXT (type)
      && TREE_CODE (TYPE_CONTEXT (type)) == BLOCK)
    {
      tree ctx = TYPE_CONTEXT (type);
      do
	{
	  ctx = BLOCK_SUPERCONTEXT (ctx);
	}
      while (ctx && TREE_CODE (ctx) == BLOCK);
      TYPE_CONTEXT (type) = ctx;
    }
}


/* Return true if DECL may need an assembler name to be set.  */

static inline bool
need_assembler_name_p (tree decl)
{
  /* We use DECL_ASSEMBLER_NAME to hold mangled type names for One Definition
     Rule merging.  This makes type_odr_p to return true on those types during
     LTO and by comparing the mangled name, we can say what types are intended
     to be equivalent across compilation unit.

     We do not store names of type_in_anonymous_namespace_p.

     Record, union and enumeration type have linkage that allows use
     to check type_in_anonymous_namespace_p. We do not mangle compound types
     that always can be compared structurally.

     Similarly for builtin types, we compare properties of their main variant.
     A special case are integer types where mangling do make differences
     between char/signed char/unsigned char etc.  Storing name for these makes
     e.g.  -fno-signed-char/-fsigned-char mismatches to be handled well.
     See cp/mangle.c:write_builtin_type for details.  */

  if (flag_lto_odr_type_mering
      && TREE_CODE (decl) == TYPE_DECL
      && DECL_NAME (decl)
      && decl == TYPE_NAME (TREE_TYPE (decl))
      && !TYPE_ARTIFICIAL (TREE_TYPE (decl))
      && (type_with_linkage_p (TREE_TYPE (decl))
	  || TREE_CODE (TREE_TYPE (decl)) == INTEGER_TYPE)
      && !variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
    return !DECL_ASSEMBLER_NAME_SET_P (decl);
  /* Only FUNCTION_DECLs and VAR_DECLs are considered.  */
  if (TREE_CODE (decl) != FUNCTION_DECL
      && TREE_CODE (decl) != VAR_DECL)
    return false;

  /* If DECL already has its assembler name set, it does not need a
     new one.  */
  if (!HAS_DECL_ASSEMBLER_NAME_P (decl)
      || DECL_ASSEMBLER_NAME_SET_P (decl))
    return false;

  /* Abstract decls do not need an assembler name.  */
  if (DECL_ABSTRACT_P (decl))
    return false;

  /* For VAR_DECLs, only static, public and external symbols need an
     assembler name.  */
  if (TREE_CODE (decl) == VAR_DECL
      && !TREE_STATIC (decl)
      && !TREE_PUBLIC (decl)
      && !DECL_EXTERNAL (decl))
    return false;

  if (TREE_CODE (decl) == FUNCTION_DECL)
    {
      /* Do not set assembler name on builtins.  Allow RTL expansion to
	 decide whether to expand inline or via a regular call.  */
      if (DECL_BUILT_IN (decl)
	  && DECL_BUILT_IN_CLASS (decl) != BUILT_IN_FRONTEND)
	return false;

      /* Functions represented in the callgraph need an assembler name.  */
      if (cgraph_node::get (decl) != NULL)
	return true;

      /* Unused and not public functions don't need an assembler name.  */
      if (!TREE_USED (decl) && !TREE_PUBLIC (decl))
	return false;
    }

  return true;
}


/* Reset all language specific information still present in symbol
   DECL.  */

static void
free_lang_data_in_decl (tree decl)
{
  gcc_assert (DECL_P (decl));

  /* Give the FE a chance to remove its own data first.  */
  lang_hooks.free_lang_data (decl);

  TREE_LANG_FLAG_0 (decl) = 0;
  TREE_LANG_FLAG_1 (decl) = 0;
  TREE_LANG_FLAG_2 (decl) = 0;
  TREE_LANG_FLAG_3 (decl) = 0;
  TREE_LANG_FLAG_4 (decl) = 0;
  TREE_LANG_FLAG_5 (decl) = 0;
  TREE_LANG_FLAG_6 (decl) = 0;

  free_lang_data_in_one_sizepos (&DECL_SIZE (decl));
  free_lang_data_in_one_sizepos (&DECL_SIZE_UNIT (decl));
  if (TREE_CODE (decl) == FIELD_DECL)
    {
      free_lang_data_in_one_sizepos (&DECL_FIELD_OFFSET (decl));
      if (TREE_CODE (DECL_CONTEXT (decl)) == QUAL_UNION_TYPE)
	DECL_QUALIFIER (decl) = NULL_TREE;
    }

 if (TREE_CODE (decl) == FUNCTION_DECL)
    {
      struct cgraph_node *node;
      if (!(node = cgraph_node::get (decl))
	  || (!node->definition && !node->clones))
	{
	  if (node)
	    node->release_body ();
	  else
	    {
	      release_function_body (decl);
	      DECL_ARGUMENTS (decl) = NULL;
	      DECL_RESULT (decl) = NULL;
	      DECL_INITIAL (decl) = error_mark_node;
	    }
	}
      if (gimple_has_body_p (decl))
	{
	  tree t;

	  /* If DECL has a gimple body, then the context for its
	     arguments must be DECL.  Otherwise, it doesn't really
	     matter, as we will not be emitting any code for DECL.  In
	     general, there may be other instances of DECL created by
	     the front end and since PARM_DECLs are generally shared,
	     their DECL_CONTEXT changes as the replicas of DECL are
	     created.  The only time where DECL_CONTEXT is important
	     is for the FUNCTION_DECLs that have a gimple body (since
	     the PARM_DECL will be used in the function's body).  */
	  for (t = DECL_ARGUMENTS (decl); t; t = TREE_CHAIN (t))
	    DECL_CONTEXT (t) = decl;
	  if (!DECL_FUNCTION_SPECIFIC_TARGET (decl))
	    DECL_FUNCTION_SPECIFIC_TARGET (decl)
	      = target_option_default_node;
	  if (!DECL_FUNCTION_SPECIFIC_OPTIMIZATION (decl))
	    DECL_FUNCTION_SPECIFIC_OPTIMIZATION (decl)
	      = optimization_default_node;
	}

      /* DECL_SAVED_TREE holds the GENERIC representation for DECL.
	 At this point, it is not needed anymore.  */
      DECL_SAVED_TREE (decl) = NULL_TREE;

      /* Clear the abstract origin if it refers to a method.  Otherwise
         dwarf2out.c will ICE as we clear TYPE_METHODS and thus the
	 origin will not be output correctly.  */
      if (DECL_ABSTRACT_ORIGIN (decl)
	  && DECL_CONTEXT (DECL_ABSTRACT_ORIGIN (decl))
	  && RECORD_OR_UNION_TYPE_P
	       (DECL_CONTEXT (DECL_ABSTRACT_ORIGIN (decl))))
	DECL_ABSTRACT_ORIGIN (decl) = NULL_TREE;

      /* Sometimes the C++ frontend doesn't manage to transform a temporary
         DECL_VINDEX referring to itself into a vtable slot number as it
	 should.  Happens with functions that are copied and then forgotten
	 about.  Just clear it, it won't matter anymore.  */
      if (DECL_VINDEX (decl) && !tree_fits_shwi_p (DECL_VINDEX (decl)))
	DECL_VINDEX (decl) = NULL_TREE;
    }
  else if (TREE_CODE (decl) == VAR_DECL)
    {
      if ((DECL_EXTERNAL (decl)
	   && (!TREE_STATIC (decl) || !TREE_READONLY (decl)))
	  || (decl_function_context (decl) && !TREE_STATIC (decl)))
	DECL_INITIAL (decl) = NULL_TREE;
    }
  else if (TREE_CODE (decl) == TYPE_DECL
	   || TREE_CODE (decl) == FIELD_DECL)
    DECL_INITIAL (decl) = NULL_TREE;
  else if (TREE_CODE (decl) == TRANSLATION_UNIT_DECL
           && DECL_INITIAL (decl)
           && TREE_CODE (DECL_INITIAL (decl)) == BLOCK)
    {
      /* Strip builtins from the translation-unit BLOCK.  We still have targets
	 without builtin_decl_explicit support and also builtins are shared
	 nodes and thus we can't use TREE_CHAIN in multiple lists.  */
      tree *nextp = &BLOCK_VARS (DECL_INITIAL (decl));
      while (*nextp)
        {
          tree var = *nextp;
          if (TREE_CODE (var) == FUNCTION_DECL
              && DECL_BUILT_IN (var))
	    *nextp = TREE_CHAIN (var);
	  else
	    nextp = &TREE_CHAIN (var);
        }
    }
}


/* Data used when collecting DECLs and TYPEs for language data removal.  */

struct free_lang_data_d
{
  /* Worklist to avoid excessive recursion.  */
  vec<tree> worklist;

  /* Set of traversed objects.  Used to avoid duplicate visits.  */
  hash_set<tree> *pset;

  /* Array of symbols to process with free_lang_data_in_decl.  */
  vec<tree> decls;

  /* Array of types to process with free_lang_data_in_type.  */
  vec<tree> types;
};


/* Save all language fields needed to generate proper debug information
   for DECL.  This saves most fields cleared out by free_lang_data_in_decl.  */

static void
save_debug_info_for_decl (tree t)
{
  /*struct saved_debug_info_d *sdi;*/

  gcc_assert (debug_info_level > DINFO_LEVEL_TERSE && t && DECL_P (t));

  /* FIXME.  Partial implementation for saving debug info removed.  */
}


/* Save all language fields needed to generate proper debug information
   for TYPE.  This saves most fields cleared out by free_lang_data_in_type.  */

static void
save_debug_info_for_type (tree t)
{
  /*struct saved_debug_info_d *sdi;*/

  gcc_assert (debug_info_level > DINFO_LEVEL_TERSE && t && TYPE_P (t));

  /* FIXME.  Partial implementation for saving debug info removed.  */
}


/* Add type or decl T to one of the list of tree nodes that need their
   language data removed.  The lists are held inside FLD.  */

static void
add_tree_to_fld_list (tree t, struct free_lang_data_d *fld)
{
  if (DECL_P (t))
    {
      fld->decls.safe_push (t);
      if (debug_info_level > DINFO_LEVEL_TERSE)
	save_debug_info_for_decl (t);
    }
  else if (TYPE_P (t))
    {
      fld->types.safe_push (t);
      if (debug_info_level > DINFO_LEVEL_TERSE)
	save_debug_info_for_type (t);
    }
  else
    gcc_unreachable ();
}

/* Push tree node T into FLD->WORKLIST.  */

static inline void
fld_worklist_push (tree t, struct free_lang_data_d *fld)
{
  if (t && !is_lang_specific (t) && !fld->pset->contains (t))
    fld->worklist.safe_push ((t));
}


/* Operand callback helper for free_lang_data_in_node.  *TP is the
   subtree operand being considered.  */

static tree
find_decls_types_r (tree *tp, int *ws, void *data)
{
  tree t = *tp;
  struct free_lang_data_d *fld = (struct free_lang_data_d *) data;

  if (TREE_CODE (t) == TREE_LIST)
    return NULL_TREE;

  /* Language specific nodes will be removed, so there is no need
     to gather anything under them.  */
  if (is_lang_specific (t))
    {
      *ws = 0;
      return NULL_TREE;
    }

  if (DECL_P (t))
    {
      /* Note that walk_tree does not traverse every possible field in
	 decls, so we have to do our own traversals here.  */
      add_tree_to_fld_list (t, fld);

      fld_worklist_push (DECL_NAME (t), fld);
      fld_worklist_push (DECL_CONTEXT (t), fld);
      fld_worklist_push (DECL_SIZE (t), fld);
      fld_worklist_push (DECL_SIZE_UNIT (t), fld);

      /* We are going to remove everything under DECL_INITIAL for
	 TYPE_DECLs.  No point walking them.  */
      if (TREE_CODE (t) != TYPE_DECL)
	fld_worklist_push (DECL_INITIAL (t), fld);

      fld_worklist_push (DECL_ATTRIBUTES (t), fld);
      fld_worklist_push (DECL_ABSTRACT_ORIGIN (t), fld);

      if (TREE_CODE (t) == FUNCTION_DECL)
	{
	  fld_worklist_push (DECL_ARGUMENTS (t), fld);
	  fld_worklist_push (DECL_RESULT (t), fld);
	}
      else if (TREE_CODE (t) == TYPE_DECL)
	{
	  fld_worklist_push (DECL_ORIGINAL_TYPE (t), fld);
	}
      else if (TREE_CODE (t) == FIELD_DECL)
	{
	  fld_worklist_push (DECL_FIELD_OFFSET (t), fld);
	  fld_worklist_push (DECL_BIT_FIELD_TYPE (t), fld);
	  fld_worklist_push (DECL_FIELD_BIT_OFFSET (t), fld);
	  fld_worklist_push (DECL_FCONTEXT (t), fld);
	}

      if ((TREE_CODE (t) == VAR_DECL || TREE_CODE (t) == PARM_DECL)
	  && DECL_HAS_VALUE_EXPR_P (t))
	fld_worklist_push (DECL_VALUE_EXPR (t), fld);

      if (TREE_CODE (t) != FIELD_DECL
	  && TREE_CODE (t) != TYPE_DECL)
	fld_worklist_push (TREE_CHAIN (t), fld);
      *ws = 0;
    }
  else if (TYPE_P (t))
    {
      /* Note that walk_tree does not traverse every possible field in
	 types, so we have to do our own traversals here.  */
      add_tree_to_fld_list (t, fld);

      if (!RECORD_OR_UNION_TYPE_P (t))
	fld_worklist_push (TYPE_CACHED_VALUES (t), fld);
      fld_worklist_push (TYPE_SIZE (t), fld);
      fld_worklist_push (TYPE_SIZE_UNIT (t), fld);
      fld_worklist_push (TYPE_ATTRIBUTES (t), fld);
      fld_worklist_push (TYPE_POINTER_TO (t), fld);
      fld_worklist_push (TYPE_REFERENCE_TO (t), fld);
      fld_worklist_push (TYPE_NAME (t), fld);
      /* Do not walk TYPE_NEXT_PTR_TO or TYPE_NEXT_REF_TO.  We do not stream
	 them and thus do not and want not to reach unused pointer types
	 this way.  */
      if (!POINTER_TYPE_P (t))
	fld_worklist_push (TYPE_MINVAL (t), fld);
      if (!RECORD_OR_UNION_TYPE_P (t))
	fld_worklist_push (TYPE_MAXVAL (t), fld);
      fld_worklist_push (TYPE_MAIN_VARIANT (t), fld);
      /* Do not walk TYPE_NEXT_VARIANT.  We do not stream it and thus
         do not and want not to reach unused variants this way.  */
      if (TYPE_CONTEXT (t))
	{
	  tree ctx = TYPE_CONTEXT (t);
	  /* We adjust BLOCK TYPE_CONTEXTs to the innermost non-BLOCK one.
	     So push that instead.  */
	  while (ctx && TREE_CODE (ctx) == BLOCK)
	    ctx = BLOCK_SUPERCONTEXT (ctx);
	  fld_worklist_push (ctx, fld);
	}
      /* Do not walk TYPE_CANONICAL.  We do not stream it and thus do not
	 and want not to reach unused types this way.  */

      if (RECORD_OR_UNION_TYPE_P (t) && TYPE_BINFO (t))
	{
	  unsigned i;
	  tree tem;
	  FOR_EACH_VEC_ELT (*BINFO_BASE_BINFOS (TYPE_BINFO (t)), i, tem)
	    fld_worklist_push (TREE_TYPE (tem), fld);
	  tem = BINFO_VIRTUALS (TYPE_BINFO (t));
	  if (tem
	      /* The Java FE overloads BINFO_VIRTUALS for its own purpose.  */
	      && TREE_CODE (tem) == TREE_LIST)
	    do
	      {
		fld_worklist_push (TREE_VALUE (tem), fld);
		tem = TREE_CHAIN (tem);
	      }
	    while (tem);
	}
      if (RECORD_OR_UNION_TYPE_P (t))
	{
	  tree tem;
	  /* Push all TYPE_FIELDS - there can be interleaving interesting
	     and non-interesting things.  */
	  tem = TYPE_FIELDS (t);
	  while (tem)
	    {
	      if (TREE_CODE (tem) == FIELD_DECL
		  || TREE_CODE (tem) == TYPE_DECL)
		fld_worklist_push (tem, fld);
	      tem = TREE_CHAIN (tem);
	    }
	}

      fld_worklist_push (TYPE_STUB_DECL (t), fld);
      *ws = 0;
    }
  else if (TREE_CODE (t) == BLOCK)
    {
      tree tem;
      for (tem = BLOCK_VARS (t); tem; tem = TREE_CHAIN (tem))
	fld_worklist_push (tem, fld);
      for (tem = BLOCK_SUBBLOCKS (t); tem; tem = BLOCK_CHAIN (tem))
	fld_worklist_push (tem, fld);
      fld_worklist_push (BLOCK_ABSTRACT_ORIGIN (t), fld);
    }

  if (TREE_CODE (t) != IDENTIFIER_NODE
      && CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPED))
    fld_worklist_push (TREE_TYPE (t), fld);

  return NULL_TREE;
}


/* Find decls and types in T.  */

static void
find_decls_types (tree t, struct free_lang_data_d *fld)
{
  while (1)
    {
      if (!fld->pset->contains (t))
	walk_tree (&t, find_decls_types_r, fld, fld->pset);
      if (fld->worklist.is_empty ())
	break;
      t = fld->worklist.pop ();
    }
}

/* Translate all the types in LIST with the corresponding runtime
   types.  */

static tree
get_eh_types_for_runtime (tree list)
{
  tree head, prev;

  if (list == NULL_TREE)
    return NULL_TREE;

  head = build_tree_list (0, lookup_type_for_runtime (TREE_VALUE (list)));
  prev = head;
  list = TREE_CHAIN (list);
  while (list)
    {
      tree n = build_tree_list (0, lookup_type_for_runtime (TREE_VALUE (list)));
      TREE_CHAIN (prev) = n;
      prev = TREE_CHAIN (prev);
      list = TREE_CHAIN (list);
    }

  return head;
}


/* Find decls and types referenced in EH region R and store them in
   FLD->DECLS and FLD->TYPES.  */

static void
find_decls_types_in_eh_region (eh_region r, struct free_lang_data_d *fld)
{
  switch (r->type)
    {
    case ERT_CLEANUP:
      break;

    case ERT_TRY:
      {
	eh_catch c;

	/* The types referenced in each catch must first be changed to the
	   EH types used at runtime.  This removes references to FE types
	   in the region.  */
	for (c = r->u.eh_try.first_catch; c ; c = c->next_catch)
	  {
	    c->type_list = get_eh_types_for_runtime (c->type_list);
	    walk_tree (&c->type_list, find_decls_types_r, fld, fld->pset);
	  }
      }
      break;

    case ERT_ALLOWED_EXCEPTIONS:
      r->u.allowed.type_list
	= get_eh_types_for_runtime (r->u.allowed.type_list);
      walk_tree (&r->u.allowed.type_list, find_decls_types_r, fld, fld->pset);
      break;

    case ERT_MUST_NOT_THROW:
      walk_tree (&r->u.must_not_throw.failure_decl,
		 find_decls_types_r, fld, fld->pset);
      break;
    }
}


/* Find decls and types referenced in cgraph node N and store them in
   FLD->DECLS and FLD->TYPES.  Unlike pass_referenced_vars, this will
   look for *every* kind of DECL and TYPE node reachable from N,
   including those embedded inside types and decls (i.e,, TYPE_DECLs,
   NAMESPACE_DECLs, etc).  */

static void
find_decls_types_in_node (struct cgraph_node *n, struct free_lang_data_d *fld)
{
  basic_block bb;
  struct function *fn;
  unsigned ix;
  tree t;

  find_decls_types (n->decl, fld);

  if (!gimple_has_body_p (n->decl))
    return;

  gcc_assert (current_function_decl == NULL_TREE && cfun == NULL);

  fn = DECL_STRUCT_FUNCTION (n->decl);

  /* Traverse locals. */
  FOR_EACH_LOCAL_DECL (fn, ix, t)
    find_decls_types (t, fld);

  /* Traverse EH regions in FN.  */
  {
    eh_region r;
    FOR_ALL_EH_REGION_FN (r, fn)
      find_decls_types_in_eh_region (r, fld);
  }

  /* Traverse every statement in FN.  */
  FOR_EACH_BB_FN (bb, fn)
    {
      gphi_iterator psi;
      gimple_stmt_iterator si;
      unsigned i;

      for (psi = gsi_start_phis (bb); !gsi_end_p (psi); gsi_next (&psi))
	{
	  gphi *phi = psi.phi ();

	  for (i = 0; i < gimple_phi_num_args (phi); i++)
	    {
	      tree *arg_p = gimple_phi_arg_def_ptr (phi, i);
	      find_decls_types (*arg_p, fld);
	    }
	}

      for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
	{
	  gimple stmt = gsi_stmt (si);

	  if (is_gimple_call (stmt))
	    find_decls_types (gimple_call_fntype (stmt), fld);

	  for (i = 0; i < gimple_num_ops (stmt); i++)
	    {
	      tree arg = gimple_op (stmt, i);
	      find_decls_types (arg, fld);
	    }
	}
    }
}


/* Find decls and types referenced in varpool node N and store them in
   FLD->DECLS and FLD->TYPES.  Unlike pass_referenced_vars, this will
   look for *every* kind of DECL and TYPE node reachable from N,
   including those embedded inside types and decls (i.e,, TYPE_DECLs,
   NAMESPACE_DECLs, etc).  */

static void
find_decls_types_in_var (varpool_node *v, struct free_lang_data_d *fld)
{
  find_decls_types (v->decl, fld);
}

/* If T needs an assembler name, have one created for it.  */

void
assign_assembler_name_if_neeeded (tree t)
{
  if (need_assembler_name_p (t))
    {
      /* When setting DECL_ASSEMBLER_NAME, the C++ mangler may emit
	 diagnostics that use input_location to show locus
	 information.  The problem here is that, at this point,
	 input_location is generally anchored to the end of the file
	 (since the parser is long gone), so we don't have a good
	 position to pin it to.

	 To alleviate this problem, this uses the location of T's
	 declaration.  Examples of this are
	 testsuite/g++.dg/template/cond2.C and
	 testsuite/g++.dg/template/pr35240.C.  */
      location_t saved_location = input_location;
      input_location = DECL_SOURCE_LOCATION (t);

      decl_assembler_name (t);

      input_location = saved_location;
    }
}


/* Free language specific information for every operand and expression
   in every node of the call graph.  This process operates in three stages:

   1- Every callgraph node and varpool node is traversed looking for
      decls and types embedded in them.  This is a more exhaustive
      search than that done by find_referenced_vars, because it will
      also collect individual fields, decls embedded in types, etc.

   2- All the decls found are sent to free_lang_data_in_decl.

   3- All the types found are sent to free_lang_data_in_type.

   The ordering between decls and types is important because
   free_lang_data_in_decl sets assembler names, which includes
   mangling.  So types cannot be freed up until assembler names have
   been set up.  */

static void
free_lang_data_in_cgraph (void)
{
  struct cgraph_node *n;
  varpool_node *v;
  struct free_lang_data_d fld;
  tree t;
  unsigned i;
  alias_pair *p;

  /* Initialize sets and arrays to store referenced decls and types.  */
  fld.pset = new hash_set<tree>;
  fld.worklist.create (0);
  fld.decls.create (100);
  fld.types.create (100);

  /* Find decls and types in the body of every function in the callgraph.  */
  FOR_EACH_FUNCTION (n)
    find_decls_types_in_node (n, &fld);

  FOR_EACH_VEC_SAFE_ELT (alias_pairs, i, p)
    find_decls_types (p->decl, &fld);

  /* Find decls and types in every varpool symbol.  */
  FOR_EACH_VARIABLE (v)
    find_decls_types_in_var (v, &fld);

  /* Set the assembler name on every decl found.  We need to do this
     now because free_lang_data_in_decl will invalidate data needed
     for mangling.  This breaks mangling on interdependent decls.  */
  FOR_EACH_VEC_ELT (fld.decls, i, t)
    assign_assembler_name_if_neeeded (t);

  /* Traverse every decl found freeing its language data.  */
  FOR_EACH_VEC_ELT (fld.decls, i, t)
    free_lang_data_in_decl (t);

  /* Traverse every type found freeing its language data.  */
  FOR_EACH_VEC_ELT (fld.types, i, t)
    free_lang_data_in_type (t);
#ifdef ENABLE_CHECKING
  FOR_EACH_VEC_ELT (fld.types, i, t)
    verify_type (t);
#endif

  delete fld.pset;
  fld.worklist.release ();
  fld.decls.release ();
  fld.types.release ();
}


/* Free resources that are used by FE but are not needed once they are done. */

static unsigned
free_lang_data (void)
{
  unsigned i;

  /* If we are the LTO frontend we have freed lang-specific data already.  */
  if (in_lto_p
      || (!flag_generate_lto && !flag_generate_offload))
    return 0;

  /* Allocate and assign alias sets to the standard integer types
     while the slots are still in the way the frontends generated them.  */
  for (i = 0; i < itk_none; ++i)
    if (integer_types[i])
      TYPE_ALIAS_SET (integer_types[i]) = get_alias_set (integer_types[i]);

  /* Traverse the IL resetting language specific information for
     operands, expressions, etc.  */
  free_lang_data_in_cgraph ();

  /* Create gimple variants for common types.  */
  ptrdiff_type_node = integer_type_node;
  fileptr_type_node = ptr_type_node;

  /* Reset some langhooks.  Do not reset types_compatible_p, it may
     still be used indirectly via the get_alias_set langhook.  */
  lang_hooks.dwarf_name = lhd_dwarf_name;
  lang_hooks.decl_printable_name = gimple_decl_printable_name;
  lang_hooks.gimplify_expr = lhd_gimplify_expr;

  /* We do not want the default decl_assembler_name implementation,
     rather if we have fixed everything we want a wrapper around it
     asserting that all non-local symbols already got their assembler
     name and only produce assembler names for local symbols.  Or rather
     make sure we never call decl_assembler_name on local symbols and
     devise a separate, middle-end private scheme for it.  */

  /* Reset diagnostic machinery.  */
  tree_diagnostics_defaults (global_dc);

  return 0;
}


namespace {

const pass_data pass_data_ipa_free_lang_data =
{
  SIMPLE_IPA_PASS, /* type */
  "*free_lang_data", /* name */
  OPTGROUP_NONE, /* optinfo_flags */
  TV_IPA_FREE_LANG_DATA, /* tv_id */
  0, /* properties_required */
  0, /* properties_provided */
  0, /* properties_destroyed */
  0, /* todo_flags_start */
  0, /* todo_flags_finish */
};

class pass_ipa_free_lang_data : public simple_ipa_opt_pass
{
public:
  pass_ipa_free_lang_data (gcc::context *ctxt)
    : simple_ipa_opt_pass (pass_data_ipa_free_lang_data, ctxt)
  {}

  /* opt_pass methods: */
  virtual unsigned int execute (function *) { return free_lang_data (); }

}; // class pass_ipa_free_lang_data

} // anon namespace

simple_ipa_opt_pass *
make_pass_ipa_free_lang_data (gcc::context *ctxt)
{
  return new pass_ipa_free_lang_data (ctxt);
}

/* The backbone of is_attribute_p().  ATTR_LEN is the string length of
   ATTR_NAME.  Also used internally by remove_attribute().  */
bool
private_is_attribute_p (const char *attr_name, size_t attr_len, const_tree ident)
{
  size_t ident_len = IDENTIFIER_LENGTH (ident);

  if (ident_len == attr_len)
    {
      if (strcmp (attr_name, IDENTIFIER_POINTER (ident)) == 0)
	return true;
    }
  else if (ident_len == attr_len + 4)
    {
      /* There is the possibility that ATTR is 'text' and IDENT is
	 '__text__'.  */
      const char *p = IDENTIFIER_POINTER (ident);      
      if (p[0] == '_' && p[1] == '_'
	  && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
	  && strncmp (attr_name, p + 2, attr_len) == 0)
	return true;
    }

  return false;
}

/* The backbone of lookup_attribute().  ATTR_LEN is the string length
   of ATTR_NAME, and LIST is not NULL_TREE.  */
tree
private_lookup_attribute (const char *attr_name, size_t attr_len, tree list)
{
  while (list)
    {
      size_t ident_len = IDENTIFIER_LENGTH (get_attribute_name (list));

      if (ident_len == attr_len)
	{
	  if (!strcmp (attr_name,
		       IDENTIFIER_POINTER (get_attribute_name (list))))
	    break;
	}
      /* TODO: If we made sure that attributes were stored in the
	 canonical form without '__...__' (ie, as in 'text' as opposed
	 to '__text__') then we could avoid the following case.  */
      else if (ident_len == attr_len + 4)
	{
	  const char *p = IDENTIFIER_POINTER (get_attribute_name (list));
	  if (p[0] == '_' && p[1] == '_'
	      && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
	      && strncmp (attr_name, p + 2, attr_len) == 0)
	    break;
	}
      list = TREE_CHAIN (list);
    }

  return list;
}

/* Given an attribute name ATTR_NAME and a list of attributes LIST,
   return a pointer to the attribute's list first element if the attribute
   starts with ATTR_NAME. ATTR_NAME must be in the form 'text' (not
   '__text__').  */

tree
private_lookup_attribute_by_prefix (const char *attr_name, size_t attr_len,
				    tree list)
{
  while (list)
    {
      size_t ident_len = IDENTIFIER_LENGTH (get_attribute_name (list));

      if (attr_len > ident_len)
	{
	  list = TREE_CHAIN (list);
	  continue;
	}

      const char *p = IDENTIFIER_POINTER (get_attribute_name (list));

      if (strncmp (attr_name, p, attr_len) == 0)
	break;

      /* TODO: If we made sure that attributes were stored in the
	 canonical form without '__...__' (ie, as in 'text' as opposed
	 to '__text__') then we could avoid the following case.  */
      if (p[0] == '_' && p[1] == '_' &&
	  strncmp (attr_name, p + 2, attr_len) == 0)
	break;

      list = TREE_CHAIN (list);
    }

  return list;
}


/* A variant of lookup_attribute() that can be used with an identifier
   as the first argument, and where the identifier can be either
   'text' or '__text__'.

   Given an attribute ATTR_IDENTIFIER, and a list of attributes LIST,
   return a pointer to the attribute's list element if the attribute
   is part of the list, or NULL_TREE if not found.  If the attribute
   appears more than once, this only returns the first occurrence; the
   TREE_CHAIN of the return value should be passed back in if further
   occurrences are wanted.  ATTR_IDENTIFIER must be an identifier but
   can be in the form 'text' or '__text__'.  */
static tree
lookup_ident_attribute (tree attr_identifier, tree list)
{
  gcc_checking_assert (TREE_CODE (attr_identifier) == IDENTIFIER_NODE);

  while (list)
    {
      gcc_checking_assert (TREE_CODE (get_attribute_name (list))
			   == IDENTIFIER_NODE);

      if (cmp_attrib_identifiers (attr_identifier,
				  get_attribute_name (list)))
	/* Found it.  */
	break;
      list = TREE_CHAIN (list);
    }

  return list;
}

/* Remove any instances of attribute ATTR_NAME in LIST and return the
   modified list.  */

tree
remove_attribute (const char *attr_name, tree list)
{
  tree *p;
  size_t attr_len = strlen (attr_name);

  gcc_checking_assert (attr_name[0] != '_');

  for (p = &list; *p; )
    {
      tree l = *p;
      /* TODO: If we were storing attributes in normalized form, here
	 we could use a simple strcmp().  */
      if (private_is_attribute_p (attr_name, attr_len, get_attribute_name (l)))
	*p = TREE_CHAIN (l);
      else
	p = &TREE_CHAIN (l);
    }

  return list;
}

/* Return an attribute list that is the union of a1 and a2.  */

tree
merge_attributes (tree a1, tree a2)
{
  tree attributes;

  /* Either one unset?  Take the set one.  */

  if ((attributes = a1) == 0)
    attributes = a2;

  /* One that completely contains the other?  Take it.  */

  else if (a2 != 0 && ! attribute_list_contained (a1, a2))
    {
      if (attribute_list_contained (a2, a1))
	attributes = a2;
      else
	{
	  /* Pick the longest list, and hang on the other list.  */

	  if (list_length (a1) < list_length (a2))
	    attributes = a2, a2 = a1;

	  for (; a2 != 0; a2 = TREE_CHAIN (a2))
	    {
	      tree a;
	      for (a = lookup_ident_attribute (get_attribute_name (a2),
					       attributes);
		   a != NULL_TREE && !attribute_value_equal (a, a2);
		   a = lookup_ident_attribute (get_attribute_name (a2),
					       TREE_CHAIN (a)))
		;
	      if (a == NULL_TREE)
		{
		  a1 = copy_node (a2);
		  TREE_CHAIN (a1) = attributes;
		  attributes = a1;
		}
	    }
	}
    }
  return attributes;
}

/* Given types T1 and T2, merge their attributes and return
  the result.  */

tree
merge_type_attributes (tree t1, tree t2)
{
  return merge_attributes (TYPE_ATTRIBUTES (t1),
			   TYPE_ATTRIBUTES (t2));
}

/* Given decls OLDDECL and NEWDECL, merge their attributes and return
   the result.  */

tree
merge_decl_attributes (tree olddecl, tree newdecl)
{
  return merge_attributes (DECL_ATTRIBUTES (olddecl),
			   DECL_ATTRIBUTES (newdecl));
}

#if TARGET_DLLIMPORT_DECL_ATTRIBUTES

/* Specialization of merge_decl_attributes for various Windows targets.

   This handles the following situation:

     __declspec (dllimport) int foo;
     int foo;

   The second instance of `foo' nullifies the dllimport.  */

tree
merge_dllimport_decl_attributes (tree old, tree new_tree)
{
  tree a;
  int delete_dllimport_p = 1;

  /* What we need to do here is remove from `old' dllimport if it doesn't
     appear in `new'.  dllimport behaves like extern: if a declaration is
     marked dllimport and a definition appears later, then the object
     is not dllimport'd.  We also remove a `new' dllimport if the old list
     contains dllexport:  dllexport always overrides dllimport, regardless
     of the order of declaration.  */
  if (!VAR_OR_FUNCTION_DECL_P (new_tree))
    delete_dllimport_p = 0;
  else if (DECL_DLLIMPORT_P (new_tree)
     	   && lookup_attribute ("dllexport", DECL_ATTRIBUTES (old)))
    {
      DECL_DLLIMPORT_P (new_tree) = 0;
      warning (OPT_Wattributes, "%q+D already declared with dllexport attribute: "
	      "dllimport ignored", new_tree);
    }
  else if (DECL_DLLIMPORT_P (old) && !DECL_DLLIMPORT_P (new_tree))
    {
      /* Warn about overriding a symbol that has already been used, e.g.:
           extern int __attribute__ ((dllimport)) foo;
	   int* bar () {return &foo;}
	   int foo;
      */
      if (TREE_USED (old))
	{
	  warning (0, "%q+D redeclared without dllimport attribute "
		   "after being referenced with dll linkage", new_tree);
	  /* If we have used a variable's address with dllimport linkage,
	      keep the old DECL_DLLIMPORT_P flag: the ADDR_EXPR using the
	      decl may already have had TREE_CONSTANT computed.
	      We still remove the attribute so that assembler code refers
	      to '&foo rather than '_imp__foo'.  */
	  if (TREE_CODE (old) == VAR_DECL && TREE_ADDRESSABLE (old))
	    DECL_DLLIMPORT_P (new_tree) = 1;
	}

      /* Let an inline definition silently override the external reference,
	 but otherwise warn about attribute inconsistency.  */
      else if (TREE_CODE (new_tree) == VAR_DECL
	       || !DECL_DECLARED_INLINE_P (new_tree))
	warning (OPT_Wattributes, "%q+D redeclared without dllimport attribute: "
		  "previous dllimport ignored", new_tree);
    }
  else
    delete_dllimport_p = 0;

  a = merge_attributes (DECL_ATTRIBUTES (old), DECL_ATTRIBUTES (new_tree));

  if (delete_dllimport_p)
    a = remove_attribute ("dllimport", a);

  return a;
}

/* Handle a "dllimport" or "dllexport" attribute; arguments as in
   struct attribute_spec.handler.  */

tree
handle_dll_attribute (tree * pnode, tree name, tree args, int flags,
		      bool *no_add_attrs)
{
  tree node = *pnode;
  bool is_dllimport;

  /* These attributes may apply to structure and union types being created,
     but otherwise should pass to the declaration involved.  */
  if (!DECL_P (node))
    {
      if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT
		   | (int) ATTR_FLAG_ARRAY_NEXT))
	{
	  *no_add_attrs = true;
	  return tree_cons (name, args, NULL_TREE);
	}
      if (TREE_CODE (node) == RECORD_TYPE
	  || TREE_CODE (node) == UNION_TYPE)
	{
	  node = TYPE_NAME (node);
	  if (!node)
	    return NULL_TREE;
	}
      else
	{
	  warning (OPT_Wattributes, "%qE attribute ignored",
		   name);
	  *no_add_attrs = true;
	  return NULL_TREE;
	}
    }

  if (TREE_CODE (node) != FUNCTION_DECL
      && TREE_CODE (node) != VAR_DECL
      && TREE_CODE (node) != TYPE_DECL)
    {
      *no_add_attrs = true;
      warning (OPT_Wattributes, "%qE attribute ignored",
	       name);
      return NULL_TREE;
    }

  if (TREE_CODE (node) == TYPE_DECL
      && TREE_CODE (TREE_TYPE (node)) != RECORD_TYPE
      && TREE_CODE (TREE_TYPE (node)) != UNION_TYPE)
    {
      *no_add_attrs = true;
      warning (OPT_Wattributes, "%qE attribute ignored",
	       name);
      return NULL_TREE;
    }

  is_dllimport = is_attribute_p ("dllimport", name);

  /* Report error on dllimport ambiguities seen now before they cause
     any damage.  */
  if (is_dllimport)
    {
      /* Honor any target-specific overrides. */
      if (!targetm.valid_dllimport_attribute_p (node))
	*no_add_attrs = true;

     else if (TREE_CODE (node) == FUNCTION_DECL
	        && DECL_DECLARED_INLINE_P (node))
	{
	  warning (OPT_Wattributes, "inline function %q+D declared as "
		  " dllimport: attribute ignored", node);
	  *no_add_attrs = true;
	}
      /* Like MS, treat definition of dllimported variables and
	 non-inlined functions on declaration as syntax errors. */
     else if (TREE_CODE (node) == FUNCTION_DECL && DECL_INITIAL (node))
	{
	  error ("function %q+D definition is marked dllimport", node);
	  *no_add_attrs = true;
	}

     else if (TREE_CODE (node) == VAR_DECL)
	{
	  if (DECL_INITIAL (node))
	    {
	      error ("variable %q+D definition is marked dllimport",
		     node);
	      *no_add_attrs = true;
	    }

	  /* `extern' needn't be specified with dllimport.
	     Specify `extern' now and hope for the best.  Sigh.  */
	  DECL_EXTERNAL (node) = 1;
	  /* Also, implicitly give dllimport'd variables declared within
	     a function global scope, unless declared static.  */
	  if (current_function_decl != NULL_TREE && !TREE_STATIC (node))
	    TREE_PUBLIC (node) = 1;
	}

      if (*no_add_attrs == false)
        DECL_DLLIMPORT_P (node) = 1;
    }
  else if (TREE_CODE (node) == FUNCTION_DECL
	   && DECL_DECLARED_INLINE_P (node)
	   && flag_keep_inline_dllexport)
    /* An exported function, even if inline, must be emitted.  */
    DECL_EXTERNAL (node) = 0;

  /*  Report error if symbol is not accessible at global scope.  */
  if (!TREE_PUBLIC (node)
      && (TREE_CODE (node) == VAR_DECL
	  || TREE_CODE (node) == FUNCTION_DECL))
    {
      error ("external linkage required for symbol %q+D because of "
	     "%qE attribute", node, name);
      *no_add_attrs = true;
    }

  /* A dllexport'd entity must have default visibility so that other
     program units (shared libraries or the main executable) can see
     it.  A dllimport'd entity must have default visibility so that
     the linker knows that undefined references within this program
     unit can be resolved by the dynamic linker.  */
  if (!*no_add_attrs)
    {
      if (DECL_VISIBILITY_SPECIFIED (node)
	  && DECL_VISIBILITY (node) != VISIBILITY_DEFAULT)
	error ("%qE implies default visibility, but %qD has already "
	       "been declared with a different visibility",
	       name, node);
      DECL_VISIBILITY (node) = VISIBILITY_DEFAULT;
      DECL_VISIBILITY_SPECIFIED (node) = 1;
    }

  return NULL_TREE;
}

#endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES  */

/* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
   of the various TYPE_QUAL values.  */

static void
set_type_quals (tree type, int type_quals)
{
  TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0;
  TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
  TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
  TYPE_ATOMIC (type) = (type_quals & TYPE_QUAL_ATOMIC) != 0;
  TYPE_ADDR_SPACE (type) = DECODE_QUAL_ADDR_SPACE (type_quals);
}

/* Returns true iff unqualified CAND and BASE are equivalent.  */

bool
check_base_type (const_tree cand, const_tree base)
{
  return (TYPE_NAME (cand) == TYPE_NAME (base)
	  /* Apparently this is needed for Objective-C.  */
	  && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
	  /* Check alignment.  */
	  && TYPE_ALIGN (cand) == TYPE_ALIGN (base)
	  && attribute_list_equal (TYPE_ATTRIBUTES (cand),
				   TYPE_ATTRIBUTES (base)));
}

/* Returns true iff CAND is equivalent to BASE with TYPE_QUALS.  */

bool
check_qualified_type (const_tree cand, const_tree base, int type_quals)
{
  return (TYPE_QUALS (cand) == type_quals
	  && check_base_type (cand, base));
}

/* Returns true iff CAND is equivalent to BASE with ALIGN.  */

static bool
check_aligned_type (const_tree cand, const_tree base, unsigned int align)
{
  return (TYPE_QUALS (cand) == TYPE_QUALS (base)
	  && TYPE_NAME (cand) == TYPE_NAME (base)
	  /* Apparently this is needed for Objective-C.  */
	  && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
	  /* Check alignment.  */
	  && TYPE_ALIGN (cand) == align
	  && attribute_list_equal (TYPE_ATTRIBUTES (cand),
				   TYPE_ATTRIBUTES (base)));
}

/* This function checks to see if TYPE matches the size one of the built-in 
   atomic types, and returns that core atomic type.  */

static tree
find_atomic_core_type (tree type)
{
  tree base_atomic_type;

  /* Only handle complete types.  */
  if (TYPE_SIZE (type) == NULL_TREE)
    return NULL_TREE;

  HOST_WIDE_INT type_size = tree_to_uhwi (TYPE_SIZE (type));
  switch (type_size)
    {
    case 8:
      base_atomic_type = atomicQI_type_node;
      break;

    case 16:
      base_atomic_type = atomicHI_type_node;
      break;

    case 32:
      base_atomic_type = atomicSI_type_node;
      break;

    case 64:
      base_atomic_type = atomicDI_type_node;
      break;

    case 128:
      base_atomic_type = atomicTI_type_node;
      break;

    default:
      base_atomic_type = NULL_TREE;
    }

  return base_atomic_type;
}

/* Return a version of the TYPE, qualified as indicated by the
   TYPE_QUALS, if one exists.  If no qualified version exists yet,
   return NULL_TREE.  */

tree
get_qualified_type (tree type, int type_quals)
{
  tree t;

  if (TYPE_QUALS (type) == type_quals)
    return type;

  /* Search the chain of variants to see if there is already one there just
     like the one we need to have.  If so, use that existing one.  We must
     preserve the TYPE_NAME, since there is code that depends on this.  */
  for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
    if (check_qualified_type (t, type, type_quals))
      return t;

  return NULL_TREE;
}

/* Like get_qualified_type, but creates the type if it does not
   exist.  This function never returns NULL_TREE.  */

tree
build_qualified_type (tree type, int type_quals)
{
  tree t;

  /* See if we already have the appropriate qualified variant.  */
  t = get_qualified_type (type, type_quals);

  /* If not, build it.  */
  if (!t)
    {
      t = build_variant_type_copy (type);
      set_type_quals (t, type_quals);

      if (((type_quals & TYPE_QUAL_ATOMIC) == TYPE_QUAL_ATOMIC))
	{
	  /* See if this object can map to a basic atomic type.  */
	  tree atomic_type = find_atomic_core_type (type);
	  if (atomic_type)
	    {
	      /* Ensure the alignment of this type is compatible with
		 the required alignment of the atomic type.  */
	      if (TYPE_ALIGN (atomic_type) > TYPE_ALIGN (t))
		TYPE_ALIGN (t) = TYPE_ALIGN (atomic_type);
	    }
	}

      if (TYPE_STRUCTURAL_EQUALITY_P (type))
	/* Propagate structural equality. */
	SET_TYPE_STRUCTURAL_EQUALITY (t);
      else if (TYPE_CANONICAL (type) != type)
	/* Build the underlying canonical type, since it is different
	   from TYPE. */
	{
	  tree c = build_qualified_type (TYPE_CANONICAL (type), type_quals);
	  TYPE_CANONICAL (t) = TYPE_CANONICAL (c);
	}
      else
	/* T is its own canonical type. */
	TYPE_CANONICAL (t) = t;

    }

  return t;
}

/* Create a variant of type T with alignment ALIGN.  */

tree
build_aligned_type (tree type, unsigned int align)
{
  tree t;

  if (TYPE_PACKED (type)
      || TYPE_ALIGN (type) == align)
    return type;

  for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
    if (check_aligned_type (t, type, align))
      return t;

  t = build_variant_type_copy (type);
  TYPE_ALIGN (t) = align;

  return t;
}

/* Create a new distinct copy of TYPE.  The new type is made its own
   MAIN_VARIANT. If TYPE requires structural equality checks, the
   resulting type requires structural equality checks; otherwise, its
   TYPE_CANONICAL points to itself. */

tree
build_distinct_type_copy (tree type)
{
  tree t = copy_node (type);

  TYPE_POINTER_TO (t) = 0;
  TYPE_REFERENCE_TO (t) = 0;

  /* Set the canonical type either to a new equivalence class, or
     propagate the need for structural equality checks. */
  if (TYPE_STRUCTURAL_EQUALITY_P (type))
    SET_TYPE_STRUCTURAL_EQUALITY (t);
  else
    TYPE_CANONICAL (t) = t;

  /* Make it its own variant.  */
  TYPE_MAIN_VARIANT (t) = t;
  TYPE_NEXT_VARIANT (t) = 0;

  /* We do not record methods in type copies nor variants
     so we do not need to keep them up to date when new method
     is inserted.  */
  if (RECORD_OR_UNION_TYPE_P (t))
    TYPE_METHODS (t) = NULL_TREE;

  /* Note that it is now possible for TYPE_MIN_VALUE to be a value
     whose TREE_TYPE is not t.  This can also happen in the Ada
     frontend when using subtypes.  */

  return t;
}

/* Create a new variant of TYPE, equivalent but distinct.  This is so
   the caller can modify it. TYPE_CANONICAL for the return type will
   be equivalent to TYPE_CANONICAL of TYPE, indicating that the types
   are considered equal by the language itself (or that both types
   require structural equality checks). */

tree
build_variant_type_copy (tree type)
{
  tree t, m = TYPE_MAIN_VARIANT (type);

  t = build_distinct_type_copy (type);

  /* Since we're building a variant, assume that it is a non-semantic
     variant. This also propagates TYPE_STRUCTURAL_EQUALITY_P. */
  TYPE_CANONICAL (t) = TYPE_CANONICAL (type);

  /* Add the new type to the chain of variants of TYPE.  */
  TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
  TYPE_NEXT_VARIANT (m) = t;
  TYPE_MAIN_VARIANT (t) = m;

  return t;
}

/* Return true if the from tree in both tree maps are equal.  */

int
tree_map_base_eq (const void *va, const void *vb)
{
  const struct tree_map_base  *const a = (const struct tree_map_base *) va,
    *const b = (const struct tree_map_base *) vb;
  return (a->from == b->from);
}

/* Hash a from tree in a tree_base_map.  */

unsigned int
tree_map_base_hash (const void *item)
{
  return htab_hash_pointer (((const struct tree_map_base *)item)->from);
}

/* Return true if this tree map structure is marked for garbage collection
   purposes.  We simply return true if the from tree is marked, so that this
   structure goes away when the from tree goes away.  */

int
tree_map_base_marked_p (const void *p)
{
  return ggc_marked_p (((const struct tree_map_base *) p)->from);
}

/* Hash a from tree in a tree_map.  */

unsigned int
tree_map_hash (const void *item)
{
  return (((const struct tree_map *) item)->hash);
}

/* Hash a from tree in a tree_decl_map.  */

unsigned int
tree_decl_map_hash (const void *item)
{
  return DECL_UID (((const struct tree_decl_map *) item)->base.from);
}

/* Return the initialization priority for DECL.  */

priority_type
decl_init_priority_lookup (tree decl)
{
  symtab_node *snode = symtab_node::get (decl);

  if (!snode)
    return DEFAULT_INIT_PRIORITY;
  return
    snode->get_init_priority ();
}

/* Return the finalization priority for DECL.  */

priority_type
decl_fini_priority_lookup (tree decl)
{
  cgraph_node *node = cgraph_node::get (decl);

  if (!node)
    return DEFAULT_INIT_PRIORITY;
  return
    node->get_fini_priority ();
}

/* Set the initialization priority for DECL to PRIORITY.  */

void
decl_init_priority_insert (tree decl, priority_type priority)
{
  struct symtab_node *snode;

  if (priority == DEFAULT_INIT_PRIORITY)
    {
      snode = symtab_node::get (decl);
      if (!snode)
	return;
    }
  else if (TREE_CODE (decl) == VAR_DECL)
    snode = varpool_node::get_create (decl);
  else
    snode = cgraph_node::get_create (decl);
  snode->set_init_priority (priority);
}

/* Set the finalization priority for DECL to PRIORITY.  */

void
decl_fini_priority_insert (tree decl, priority_type priority)
{
  struct cgraph_node *node;

  if (priority == DEFAULT_INIT_PRIORITY)
    {
      node = cgraph_node::get (decl);
      if (!node)
	return;
    }
  else
    node = cgraph_node::get_create (decl);
  node->set_fini_priority (priority);
}

/* Print out the statistics for the DECL_DEBUG_EXPR hash table.  */

static void
print_debug_expr_statistics (void)
{
  fprintf (stderr, "DECL_DEBUG_EXPR  hash: size %ld, %ld elements, %f collisions\n",
	   (long) debug_expr_for_decl->size (),
	   (long) debug_expr_for_decl->elements (),
	   debug_expr_for_decl->collisions ());
}

/* Print out the statistics for the DECL_VALUE_EXPR hash table.  */

static void
print_value_expr_statistics (void)
{
  fprintf (stderr, "DECL_VALUE_EXPR  hash: size %ld, %ld elements, %f collisions\n",
	   (long) value_expr_for_decl->size (),
	   (long) value_expr_for_decl->elements (),
	   value_expr_for_decl->collisions ());
}

/* Lookup a debug expression for FROM, and return it if we find one.  */

tree
decl_debug_expr_lookup (tree from)
{
  struct tree_decl_map *h, in;
  in.base.from = from;

  h = debug_expr_for_decl->find_with_hash (&in, DECL_UID (from));
  if (h)
    return h->to;
  return NULL_TREE;
}

/* Insert a mapping FROM->TO in the debug expression hashtable.  */

void
decl_debug_expr_insert (tree from, tree to)
{
  struct tree_decl_map *h;

  h = ggc_alloc<tree_decl_map> ();
  h->base.from = from;
  h->to = to;
  *debug_expr_for_decl->find_slot_with_hash (h, DECL_UID (from), INSERT) = h;
}

/* Lookup a value expression for FROM, and return it if we find one.  */

tree
decl_value_expr_lookup (tree from)
{
  struct tree_decl_map *h, in;
  in.base.from = from;

  h = value_expr_for_decl->find_with_hash (&in, DECL_UID (from));
  if (h)
    return h->to;
  return NULL_TREE;
}

/* Insert a mapping FROM->TO in the value expression hashtable.  */

void
decl_value_expr_insert (tree from, tree to)
{
  struct tree_decl_map *h;

  h = ggc_alloc<tree_decl_map> ();
  h->base.from = from;
  h->to = to;
  *value_expr_for_decl->find_slot_with_hash (h, DECL_UID (from), INSERT) = h;
}

/* Lookup a vector of debug arguments for FROM, and return it if we
   find one.  */

vec<tree, va_gc> **
decl_debug_args_lookup (tree from)
{
  struct tree_vec_map *h, in;

  if (!DECL_HAS_DEBUG_ARGS_P (from))
    return NULL;
  gcc_checking_assert (debug_args_for_decl != NULL);
  in.base.from = from;
  h = debug_args_for_decl->find_with_hash (&in, DECL_UID (from));
  if (h)
    return &h->to;
  return NULL;
}

/* Insert a mapping FROM->empty vector of debug arguments in the value
   expression hashtable.  */

vec<tree, va_gc> **
decl_debug_args_insert (tree from)
{
  struct tree_vec_map *h;
  tree_vec_map **loc;

  if (DECL_HAS_DEBUG_ARGS_P (from))
    return decl_debug_args_lookup (from);
  if (debug_args_for_decl == NULL)
    debug_args_for_decl = hash_table<tree_vec_map_cache_hasher>::create_ggc (64);
  h = ggc_alloc<tree_vec_map> ();
  h->base.from = from;
  h->to = NULL;
  loc = debug_args_for_decl->find_slot_with_hash (h, DECL_UID (from), INSERT);
  *loc = h;
  DECL_HAS_DEBUG_ARGS_P (from) = 1;
  return &h->to;
}

/* Hashing of types so that we don't make duplicates.
   The entry point is `type_hash_canon'.  */

/* Compute a hash code for a list of types (chain of TREE_LIST nodes
   with types in the TREE_VALUE slots), by adding the hash codes
   of the individual types.  */

static void
type_hash_list (const_tree list, inchash::hash &hstate)
{
  const_tree tail;

  for (tail = list; tail; tail = TREE_CHAIN (tail))
    if (TREE_VALUE (tail) != error_mark_node)
      hstate.add_object (TYPE_HASH (TREE_VALUE (tail)));
}

/* These are the Hashtable callback functions.  */

/* Returns true iff the types are equivalent.  */

bool
type_cache_hasher::equal (type_hash *a, type_hash *b)
{
  /* First test the things that are the same for all types.  */
  if (a->hash != b->hash
      || TREE_CODE (a->type) != TREE_CODE (b->type)
      || TREE_TYPE (a->type) != TREE_TYPE (b->type)
      || !attribute_list_equal (TYPE_ATTRIBUTES (a->type),
				 TYPE_ATTRIBUTES (b->type))
      || (TREE_CODE (a->type) != COMPLEX_TYPE
          && TYPE_NAME (a->type) != TYPE_NAME (b->type)))
    return 0;

  /* Be careful about comparing arrays before and after the element type
     has been completed; don't compare TYPE_ALIGN unless both types are
     complete.  */
  if (COMPLETE_TYPE_P (a->type) && COMPLETE_TYPE_P (b->type)
      && (TYPE_ALIGN (a->type) != TYPE_ALIGN (b->type)
	  || TYPE_MODE (a->type) != TYPE_MODE (b->type)))
    return 0;

  switch (TREE_CODE (a->type))
    {
    case VOID_TYPE:
    case COMPLEX_TYPE:
    case POINTER_TYPE:
    case REFERENCE_TYPE:
    case NULLPTR_TYPE:
      return 1;

    case VECTOR_TYPE:
      return TYPE_VECTOR_SUBPARTS (a->type) == TYPE_VECTOR_SUBPARTS (b->type);

    case ENUMERAL_TYPE:
      if (TYPE_VALUES (a->type) != TYPE_VALUES (b->type)
	  && !(TYPE_VALUES (a->type)
	       && TREE_CODE (TYPE_VALUES (a->type)) == TREE_LIST
	       && TYPE_VALUES (b->type)
	       && TREE_CODE (TYPE_VALUES (b->type)) == TREE_LIST
	       && type_list_equal (TYPE_VALUES (a->type),
				   TYPE_VALUES (b->type))))
	return 0;

      /* ... fall through ... */

    case INTEGER_TYPE:
    case REAL_TYPE:
    case BOOLEAN_TYPE:
      if (TYPE_PRECISION (a->type) != TYPE_PRECISION (b->type))
	return false;
      return ((TYPE_MAX_VALUE (a->type) == TYPE_MAX_VALUE (b->type)
	       || tree_int_cst_equal (TYPE_MAX_VALUE (a->type),
				      TYPE_MAX_VALUE (b->type)))
	      && (TYPE_MIN_VALUE (a->type) == TYPE_MIN_VALUE (b->type)
		  || tree_int_cst_equal (TYPE_MIN_VALUE (a->type),
					 TYPE_MIN_VALUE (b->type))));

    case FIXED_POINT_TYPE:
      return TYPE_SATURATING (a->type) == TYPE_SATURATING (b->type);

    case OFFSET_TYPE:
      return TYPE_OFFSET_BASETYPE (a->type) == TYPE_OFFSET_BASETYPE (b->type);

    case METHOD_TYPE:
      if (TYPE_METHOD_BASETYPE (a->type) == TYPE_METHOD_BASETYPE (b->type)
	  && (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
	      || (TYPE_ARG_TYPES (a->type)
		  && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
		  && TYPE_ARG_TYPES (b->type)
		  && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
		  && type_list_equal (TYPE_ARG_TYPES (a->type),
				      TYPE_ARG_TYPES (b->type)))))
        break;
      return 0;
    case ARRAY_TYPE:
      return TYPE_DOMAIN (a->type) == TYPE_DOMAIN (b->type);

    case RECORD_TYPE:
    case UNION_TYPE:
    case QUAL_UNION_TYPE:
      return (TYPE_FIELDS (a->type) == TYPE_FIELDS (b->type)
	      || (TYPE_FIELDS (a->type)
		  && TREE_CODE (TYPE_FIELDS (a->type)) == TREE_LIST
		  && TYPE_FIELDS (b->type)
		  && TREE_CODE (TYPE_FIELDS (b->type)) == TREE_LIST
		  && type_list_equal (TYPE_FIELDS (a->type),
				      TYPE_FIELDS (b->type))));

    case FUNCTION_TYPE:
      if (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
	  || (TYPE_ARG_TYPES (a->type)
	      && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
	      && TYPE_ARG_TYPES (b->type)
	      && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
	      && type_list_equal (TYPE_ARG_TYPES (a->type),
				  TYPE_ARG_TYPES (b->type))))
	break;
      return 0;

    default:
      return 0;
    }

  if (lang_hooks.types.type_hash_eq != NULL)
    return lang_hooks.types.type_hash_eq (a->type, b->type);

  return 1;
}

/* Given TYPE, and HASHCODE its hash code, return the canonical
   object for an identical type if one already exists.
   Otherwise, return TYPE, and record it as the canonical object.

   To use this function, first create a type of the sort you want.
   Then compute its hash code from the fields of the type that
   make it different from other similar types.
   Then call this function and use the value.  */

tree
type_hash_canon (unsigned int hashcode, tree type)
{
  type_hash in;
  type_hash **loc;

  /* The hash table only contains main variants, so ensure that's what we're
     being passed.  */
  gcc_assert (TYPE_MAIN_VARIANT (type) == type);

  /* The TYPE_ALIGN field of a type is set by layout_type(), so we
     must call that routine before comparing TYPE_ALIGNs.  */
  layout_type (type);

  in.hash = hashcode;
  in.type = type;

  loc = type_hash_table->find_slot_with_hash (&in, hashcode, INSERT);
  if (*loc)
    {
      tree t1 = ((type_hash *) *loc)->type;
      gcc_assert (TYPE_MAIN_VARIANT (t1) == t1);
      if (GATHER_STATISTICS)
	{
	  tree_code_counts[(int) TREE_CODE (type)]--;
	  tree_node_counts[(int) t_kind]--;
	  tree_node_sizes[(int) t_kind] -= sizeof (struct tree_type_non_common);
	}
      return t1;
    }
  else
    {
      struct type_hash *h;

      h = ggc_alloc<type_hash> ();
      h->hash = hashcode;
      h->type = type;
      *loc = h;

      return type;
    }
}

static void
print_type_hash_statistics (void)
{
  fprintf (stderr, "Type hash: size %ld, %ld elements, %f collisions\n",
	   (long) type_hash_table->size (),
	   (long) type_hash_table->elements (),
	   type_hash_table->collisions ());
}

/* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
   with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
   by adding the hash codes of the individual attributes.  */

static void
attribute_hash_list (const_tree list, inchash::hash &hstate)
{
  const_tree tail;

  for (tail = list; tail; tail = TREE_CHAIN (tail))
    /* ??? Do we want to add in TREE_VALUE too? */
    hstate.add_object (IDENTIFIER_HASH_VALUE (get_attribute_name (tail)));
}

/* Given two lists of attributes, return true if list l2 is
   equivalent to l1.  */

int
attribute_list_equal (const_tree l1, const_tree l2)
{
  if (l1 == l2)
    return 1;

  return attribute_list_contained (l1, l2)
	 && attribute_list_contained (l2, l1);
}

/* Given two lists of attributes, return true if list L2 is
   completely contained within L1.  */
/* ??? This would be faster if attribute names were stored in a canonicalized
   form.  Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
   must be used to show these elements are equivalent (which they are).  */
/* ??? It's not clear that attributes with arguments will always be handled
   correctly.  */

int
attribute_list_contained (const_tree l1, const_tree l2)
{
  const_tree t1, t2;

  /* First check the obvious, maybe the lists are identical.  */
  if (l1 == l2)
    return 1;

  /* Maybe the lists are similar.  */
  for (t1 = l1, t2 = l2;
       t1 != 0 && t2 != 0
        && get_attribute_name (t1) == get_attribute_name (t2)
        && TREE_VALUE (t1) == TREE_VALUE (t2);
       t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
    ;

  /* Maybe the lists are equal.  */
  if (t1 == 0 && t2 == 0)
    return 1;

  for (; t2 != 0; t2 = TREE_CHAIN (t2))
    {
      const_tree attr;
      /* This CONST_CAST is okay because lookup_attribute does not
	 modify its argument and the return value is assigned to a
	 const_tree.  */
      for (attr = lookup_ident_attribute (get_attribute_name (t2),
					  CONST_CAST_TREE (l1));
	   attr != NULL_TREE && !attribute_value_equal (t2, attr);
	   attr = lookup_ident_attribute (get_attribute_name (t2),
					  TREE_CHAIN (attr)))
	;

      if (attr == NULL_TREE)
	return 0;
    }

  return 1;
}

/* Given two lists of types
   (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
   return 1 if the lists contain the same types in the same order.
   Also, the TREE_PURPOSEs must match.  */

int
type_list_equal (const_tree l1, const_tree l2)
{
  const_tree t1, t2;

  for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
    if (TREE_VALUE (t1) != TREE_VALUE (t2)
	|| (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
	    && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
		  && (TREE_TYPE (TREE_PURPOSE (t1))
		      == TREE_TYPE (TREE_PURPOSE (t2))))))
      return 0;

  return t1 == t2;
}

/* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
   given by TYPE.  If the argument list accepts variable arguments,
   then this function counts only the ordinary arguments.  */

int
type_num_arguments (const_tree type)
{
  int i = 0;
  tree t;

  for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
    /* If the function does not take a variable number of arguments,
       the last element in the list will have type `void'.  */
    if (VOID_TYPE_P (TREE_VALUE (t)))
      break;
    else
      ++i;

  return i;
}

/* Nonzero if integer constants T1 and T2
   represent the same constant value.  */

int
tree_int_cst_equal (const_tree t1, const_tree t2)
{
  if (t1 == t2)
    return 1;

  if (t1 == 0 || t2 == 0)
    return 0;

  if (TREE_CODE (t1) == INTEGER_CST
      && TREE_CODE (t2) == INTEGER_CST
      && wi::to_widest (t1) == wi::to_widest (t2))
    return 1;

  return 0;
}

/* Return true if T is an INTEGER_CST whose numerical value (extended
   according to TYPE_UNSIGNED) fits in a signed HOST_WIDE_INT.  */

bool
tree_fits_shwi_p (const_tree t)
{
  return (t != NULL_TREE
	  && TREE_CODE (t) == INTEGER_CST
	  && wi::fits_shwi_p (wi::to_widest (t)));
}

/* Return true if T is an INTEGER_CST whose numerical value (extended
   according to TYPE_UNSIGNED) fits in an unsigned HOST_WIDE_INT.  */

bool
tree_fits_uhwi_p (const_tree t)
{
  return (t != NULL_TREE
	  && TREE_CODE (t) == INTEGER_CST
	  && wi::fits_uhwi_p (wi::to_widest (t)));
}

/* T is an INTEGER_CST whose numerical value (extended according to
   TYPE_UNSIGNED) fits in a signed HOST_WIDE_INT.  Return that
   HOST_WIDE_INT.  */

HOST_WIDE_INT
tree_to_shwi (const_tree t)
{
  gcc_assert (tree_fits_shwi_p (t));
  return TREE_INT_CST_LOW (t);
}

/* T is an INTEGER_CST whose numerical value (extended according to
   TYPE_UNSIGNED) fits in an unsigned HOST_WIDE_INT.  Return that
   HOST_WIDE_INT.  */

unsigned HOST_WIDE_INT
tree_to_uhwi (const_tree t)
{
  gcc_assert (tree_fits_uhwi_p (t));
  return TREE_INT_CST_LOW (t);
}

/* Return the most significant (sign) bit of T.  */

int
tree_int_cst_sign_bit (const_tree t)
{
  unsigned bitno = TYPE_PRECISION (TREE_TYPE (t)) - 1;

  return wi::extract_uhwi (t, bitno, 1);
}

/* Return an indication of the sign of the integer constant T.
   The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
   Note that -1 will never be returned if T's type is unsigned.  */

int
tree_int_cst_sgn (const_tree t)
{
  if (wi::eq_p (t, 0))
    return 0;
  else if (TYPE_UNSIGNED (TREE_TYPE (t)))
    return 1;
  else if (wi::neg_p (t))
    return -1;
  else
    return 1;
}

/* Return the minimum number of bits needed to represent VALUE in a
   signed or unsigned type, UNSIGNEDP says which.  */

unsigned int
tree_int_cst_min_precision (tree value, signop sgn)
{
  /* If the value is negative, compute its negative minus 1.  The latter
     adjustment is because the absolute value of the largest negative value
     is one larger than the largest positive value.  This is equivalent to
     a bit-wise negation, so use that operation instead.  */

  if (tree_int_cst_sgn (value) < 0)
    value = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (value), value);

  /* Return the number of bits needed, taking into account the fact
     that we need one more bit for a signed than unsigned type.
     If value is 0 or -1, the minimum precision is 1 no matter
     whether unsignedp is true or false.  */

  if (integer_zerop (value))
    return 1;
  else
    return tree_floor_log2 (value) + 1 + (sgn == SIGNED ? 1 : 0) ;
}

/* Return truthvalue of whether T1 is the same tree structure as T2.
   Return 1 if they are the same.
   Return 0 if they are understandably different.
   Return -1 if either contains tree structure not understood by
   this function.  */

int
simple_cst_equal (const_tree t1, const_tree t2)
{
  enum tree_code code1, code2;
  int cmp;
  int i;

  if (t1 == t2)
    return 1;
  if (t1 == 0 || t2 == 0)
    return 0;

  code1 = TREE_CODE (t1);
  code2 = TREE_CODE (t2);

  if (CONVERT_EXPR_CODE_P (code1) || code1 == NON_LVALUE_EXPR)
    {
      if (CONVERT_EXPR_CODE_P (code2)
	  || code2 == NON_LVALUE_EXPR)
	return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
      else
	return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
    }

  else if (CONVERT_EXPR_CODE_P (code2)
	   || code2 == NON_LVALUE_EXPR)
    return simple_cst_equal (t1, TREE_OPERAND (t2, 0));

  if (code1 != code2)
    return 0;

  switch (code1)
    {
    case INTEGER_CST:
      return wi::to_widest (t1) == wi::to_widest (t2);

    case REAL_CST:
      return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));

    case FIXED_CST:
      return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));

    case STRING_CST:
      return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
	      && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
			 TREE_STRING_LENGTH (t1)));

    case CONSTRUCTOR:
      {
	unsigned HOST_WIDE_INT idx;
	vec<constructor_elt, va_gc> *v1 = CONSTRUCTOR_ELTS (t1);
	vec<constructor_elt, va_gc> *v2 = CONSTRUCTOR_ELTS (t2);

	if (vec_safe_length (v1) != vec_safe_length (v2))
	  return false;

        for (idx = 0; idx < vec_safe_length (v1); ++idx)
	  /* ??? Should we handle also fields here? */
	  if (!simple_cst_equal ((*v1)[idx].value, (*v2)[idx].value))
	    return false;
	return true;
      }

    case SAVE_EXPR:
      return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));

    case CALL_EXPR:
      cmp = simple_cst_equal (CALL_EXPR_FN (t1), CALL_EXPR_FN (t2));
      if (cmp <= 0)
	return cmp;
      if (call_expr_nargs (t1) != call_expr_nargs (t2))
	return 0;
      {
	const_tree arg1, arg2;
	const_call_expr_arg_iterator iter1, iter2;
	for (arg1 = first_const_call_expr_arg (t1, &iter1),
	       arg2 = first_const_call_expr_arg (t2, &iter2);
	     arg1 && arg2;
	     arg1 = next_const_call_expr_arg (&iter1),
	       arg2 = next_const_call_expr_arg (&iter2))
	  {
	    cmp = simple_cst_equal (arg1, arg2);
	    if (cmp <= 0)
	      return cmp;
	  }
	return arg1 == arg2;
      }

    case TARGET_EXPR:
      /* Special case: if either target is an unallocated VAR_DECL,
	 it means that it's going to be unified with whatever the
	 TARGET_EXPR is really supposed to initialize, so treat it
	 as being equivalent to anything.  */
      if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
	   && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
	   && !DECL_RTL_SET_P (TREE_OPERAND (t1, 0)))
	  || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
	      && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
	      && !DECL_RTL_SET_P (TREE_OPERAND (t2, 0))))
	cmp = 1;
      else
	cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));

      if (cmp <= 0)
	return cmp;

      return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));

    case WITH_CLEANUP_EXPR:
      cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
      if (cmp <= 0)
	return cmp;

      return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));

    case COMPONENT_REF:
      if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
	return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));

      return 0;

    case VAR_DECL:
    case PARM_DECL:
    case CONST_DECL:
    case FUNCTION_DECL:
      return 0;

    default:
      break;
    }

  /* This general rule works for most tree codes.  All exceptions should be
     handled above.  If this is a language-specific tree code, we can't
     trust what might be in the operand, so say we don't know
     the situation.  */
  if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE)
    return -1;

  switch (TREE_CODE_CLASS (code1))
    {
    case tcc_unary:
    case tcc_binary:
    case tcc_comparison:
    case tcc_expression:
    case tcc_reference:
    case tcc_statement:
      cmp = 1;
      for (i = 0; i < TREE_CODE_LENGTH (code1); i++)
	{
	  cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
	  if (cmp <= 0)
	    return cmp;
	}

      return cmp;

    default:
      return -1;
    }
}

/* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
   Return -1, 0, or 1 if the value of T is less than, equal to, or greater
   than U, respectively.  */

int
compare_tree_int (const_tree t, unsigned HOST_WIDE_INT u)
{
  if (tree_int_cst_sgn (t) < 0)
    return -1;
  else if (!tree_fits_uhwi_p (t))
    return 1;
  else if (TREE_INT_CST_LOW (t) == u)
    return 0;
  else if (TREE_INT_CST_LOW (t) < u)
    return -1;
  else
    return 1;
}

/* Return true if SIZE represents a constant size that is in bounds of
   what the middle-end and the backend accepts (covering not more than
   half of the address-space).  */

bool
valid_constant_size_p (const_tree size)
{
  if (! tree_fits_uhwi_p (size)
      || TREE_OVERFLOW (size)
      || tree_int_cst_sign_bit (size) != 0)
    return false;
  return true;
}

/* Return the precision of the type, or for a complex or vector type the
   precision of the type of its elements.  */

unsigned int
element_precision (const_tree type)
{
  enum tree_code code = TREE_CODE (type);
  if (code == COMPLEX_TYPE || code == VECTOR_TYPE)
    type = TREE_TYPE (type);

  return TYPE_PRECISION (type);
}

/* Return true if CODE represents an associative tree code.  Otherwise
   return false.  */
bool
associative_tree_code (enum tree_code code)
{
  switch (code)
    {
    case BIT_IOR_EXPR:
    case BIT_AND_EXPR:
    case BIT_XOR_EXPR:
    case PLUS_EXPR:
    case MULT_EXPR:
    case MIN_EXPR:
    case MAX_EXPR:
      return true;

    default:
      break;
    }
  return false;
}

/* Return true if CODE represents a commutative tree code.  Otherwise
   return false.  */
bool
commutative_tree_code (enum tree_code code)
{
  switch (code)
    {
    case PLUS_EXPR:
    case MULT_EXPR:
    case MULT_HIGHPART_EXPR:
    case MIN_EXPR:
    case MAX_EXPR:
    case BIT_IOR_EXPR:
    case BIT_XOR_EXPR:
    case BIT_AND_EXPR:
    case NE_EXPR:
    case EQ_EXPR:
    case UNORDERED_EXPR:
    case ORDERED_EXPR:
    case UNEQ_EXPR:
    case LTGT_EXPR:
    case TRUTH_AND_EXPR:
    case TRUTH_XOR_EXPR:
    case TRUTH_OR_EXPR:
    case WIDEN_MULT_EXPR:
    case VEC_WIDEN_MULT_HI_EXPR:
    case VEC_WIDEN_MULT_LO_EXPR:
    case VEC_WIDEN_MULT_EVEN_EXPR:
    case VEC_WIDEN_MULT_ODD_EXPR:
      return true;

    default:
      break;
    }
  return false;
}

/* Return true if CODE represents a ternary tree code for which the
   first two operands are commutative.  Otherwise return false.  */
bool
commutative_ternary_tree_code (enum tree_code code)
{
  switch (code)
    {
    case WIDEN_MULT_PLUS_EXPR:
    case WIDEN_MULT_MINUS_EXPR:
    case DOT_PROD_EXPR:
    case FMA_EXPR:
      return true;

    default:
      break;
    }
  return false;
}

namespace inchash
{

/* Generate a hash value for an expression.  This can be used iteratively
   by passing a previous result as the HSTATE argument.

   This function is intended to produce the same hash for expressions which
   would compare equal using operand_equal_p.  */
void
add_expr (const_tree t, inchash::hash &hstate)
{
  int i;
  enum tree_code code;
  enum tree_code_class tclass;

  if (t == NULL_TREE)
    {
      hstate.merge_hash (0);
      return;
    }

  code = TREE_CODE (t);

  switch (code)
    {
    /* Alas, constants aren't shared, so we can't rely on pointer
       identity.  */
    case VOID_CST:
      hstate.merge_hash (0);
      return;
    case INTEGER_CST:
      for (i = 0; i < TREE_INT_CST_NUNITS (t); i++)
	hstate.add_wide_int (TREE_INT_CST_ELT (t, i));
      return;
    case REAL_CST:
      {
	unsigned int val2 = real_hash (TREE_REAL_CST_PTR (t));
	hstate.merge_hash (val2);
	return;
      }
    case FIXED_CST:
      {
	unsigned int val2 = fixed_hash (TREE_FIXED_CST_PTR (t));
	hstate.merge_hash (val2);
	return;
      }
    case STRING_CST:
      hstate.add ((const void *) TREE_STRING_POINTER (t), TREE_STRING_LENGTH (t));
      return;
    case COMPLEX_CST:
      inchash::add_expr (TREE_REALPART (t), hstate);
      inchash::add_expr (TREE_IMAGPART (t), hstate);
      return;
    case VECTOR_CST:
      {
	unsigned i;
	for (i = 0; i < VECTOR_CST_NELTS (t); ++i)
	  inchash::add_expr (VECTOR_CST_ELT (t, i), hstate);
	return;
      }
    case SSA_NAME:
      /* We can just compare by pointer.  */
      hstate.add_wide_int (SSA_NAME_VERSION (t));
      return;
    case PLACEHOLDER_EXPR:
      /* The node itself doesn't matter.  */
      return;
    case TREE_LIST:
      /* A list of expressions, for a CALL_EXPR or as the elements of a
	 VECTOR_CST.  */
      for (; t; t = TREE_CHAIN (t))
	inchash::add_expr (TREE_VALUE (t), hstate);
      return;
    case CONSTRUCTOR:
      {
	unsigned HOST_WIDE_INT idx;
	tree field, value;
	FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t), idx, field, value)
	  {
	    inchash::add_expr (field, hstate);
	    inchash::add_expr (value, hstate);
	  }
	return;
      }
    case FUNCTION_DECL:
      /* When referring to a built-in FUNCTION_DECL, use the __builtin__ form.
	 Otherwise nodes that compare equal according to operand_equal_p might
	 get different hash codes.  However, don't do this for machine specific
	 or front end builtins, since the function code is overloaded in those
	 cases.  */
      if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL
	  && builtin_decl_explicit_p (DECL_FUNCTION_CODE (t)))
	{
	  t = builtin_decl_explicit (DECL_FUNCTION_CODE (t));
	  code = TREE_CODE (t);
	}
      /* FALL THROUGH */
    default:
      tclass = TREE_CODE_CLASS (code);

      if (tclass == tcc_declaration)
	{
	  /* DECL's have a unique ID */
	  hstate.add_wide_int (DECL_UID (t));
	}
      else
	{
	  gcc_assert (IS_EXPR_CODE_CLASS (tclass));

	  hstate.add_object (code);

	  /* Don't hash the type, that can lead to having nodes which
	     compare equal according to operand_equal_p, but which
	     have different hash codes.  */
	  if (CONVERT_EXPR_CODE_P (code)
	      || code == NON_LVALUE_EXPR)
	    {
	      /* Make sure to include signness in the hash computation.  */
	      hstate.add_int (TYPE_UNSIGNED (TREE_TYPE (t)));
	      inchash::add_expr (TREE_OPERAND (t, 0), hstate);
	    }

	  else if (commutative_tree_code (code))
	    {
	      /* It's a commutative expression.  We want to hash it the same
		 however it appears.  We do this by first hashing both operands
		 and then rehashing based on the order of their independent
		 hashes.  */
	      inchash::hash one, two;
	      inchash::add_expr (TREE_OPERAND (t, 0), one);
	      inchash::add_expr (TREE_OPERAND (t, 1), two);
	      hstate.add_commutative (one, two);
	    }
	  else
	    for (i = TREE_OPERAND_LENGTH (t) - 1; i >= 0; --i)
	      inchash::add_expr (TREE_OPERAND (t, i), hstate);
	}
      return;
    }
}

}

/* Constructors for pointer, array and function types.
   (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
   constructed by language-dependent code, not here.)  */

/* Construct, lay out and return the type of pointers to TO_TYPE with
   mode MODE.  If CAN_ALIAS_ALL is TRUE, indicate this type can
   reference all of memory. If such a type has already been
   constructed, reuse it.  */

tree
build_pointer_type_for_mode (tree to_type, machine_mode mode,
			     bool can_alias_all)
{
  tree t;
  bool could_alias = can_alias_all;

  if (to_type == error_mark_node)
    return error_mark_node;

  /* If the pointed-to type has the may_alias attribute set, force
     a TYPE_REF_CAN_ALIAS_ALL pointer to be generated.  */
  if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (to_type)))
    can_alias_all = true;

  /* In some cases, languages will have things that aren't a POINTER_TYPE
     (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
     In that case, return that type without regard to the rest of our
     operands.

     ??? This is a kludge, but consistent with the way this function has
     always operated and there doesn't seem to be a good way to avoid this
     at the moment.  */
  if (TYPE_POINTER_TO (to_type) != 0
      && TREE_CODE (TYPE_POINTER_TO (to_type)) != POINTER_TYPE)
    return TYPE_POINTER_TO (to_type);

  /* First, if we already have a type for pointers to TO_TYPE and it's
     the proper mode, use it.  */
  for (t = TYPE_POINTER_TO (to_type); t; t = TYPE_NEXT_PTR_TO (t))
    if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
      return t;

  t = make_node (POINTER_TYPE);

  TREE_TYPE (t) = to_type;
  SET_TYPE_MODE (t, mode);
  TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
  TYPE_NEXT_PTR_TO (t) = TYPE_POINTER_TO (to_type);
  TYPE_POINTER_TO (to_type) = t;

  if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
    SET_TYPE_STRUCTURAL_EQUALITY (t);
  else if (TYPE_CANONICAL (to_type) != to_type || could_alias)
    TYPE_CANONICAL (t)
      = build_pointer_type_for_mode (TYPE_CANONICAL (to_type),
				     mode, false);

  /* Lay out the type.  This function has many callers that are concerned
     with expression-construction, and this simplifies them all.  */
  layout_type (t);

  return t;
}

/* By default build pointers in ptr_mode.  */

tree
build_pointer_type (tree to_type)
{
  addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
					      : TYPE_ADDR_SPACE (to_type);
  machine_mode pointer_mode = targetm.addr_space.pointer_mode (as);
  return build_pointer_type_for_mode (to_type, pointer_mode, false);
}

/* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE.  */

tree
build_reference_type_for_mode (tree to_type, machine_mode mode,
			       bool can_alias_all)
{
  tree t;
  bool could_alias = can_alias_all;

  if (to_type == error_mark_node)
    return error_mark_node;

  /* If the pointed-to type has the may_alias attribute set, force
     a TYPE_REF_CAN_ALIAS_ALL pointer to be generated.  */
  if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (to_type)))
    can_alias_all = true;

  /* In some cases, languages will have things that aren't a REFERENCE_TYPE
     (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
     In that case, return that type without regard to the rest of our
     operands.

     ??? This is a kludge, but consistent with the way this function has
     always operated and there doesn't seem to be a good way to avoid this
     at the moment.  */
  if (TYPE_REFERENCE_TO (to_type) != 0
      && TREE_CODE (TYPE_REFERENCE_TO (to_type)) != REFERENCE_TYPE)
    return TYPE_REFERENCE_TO (to_type);

  /* First, if we already have a type for pointers to TO_TYPE and it's
     the proper mode, use it.  */
  for (t = TYPE_REFERENCE_TO (to_type); t; t = TYPE_NEXT_REF_TO (t))
    if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
      return t;

  t = make_node (REFERENCE_TYPE);

  TREE_TYPE (t) = to_type;
  SET_TYPE_MODE (t, mode);
  TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
  TYPE_NEXT_REF_TO (t) = TYPE_REFERENCE_TO (to_type);
  TYPE_REFERENCE_TO (to_type) = t;

  if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
    SET_TYPE_STRUCTURAL_EQUALITY (t);
  else if (TYPE_CANONICAL (to_type) != to_type || could_alias)
    TYPE_CANONICAL (t)
      = build_reference_type_for_mode (TYPE_CANONICAL (to_type),
				       mode, false);

  layout_type (t);

  return t;
}


/* Build the node for the type of references-to-TO_TYPE by default
   in ptr_mode.  */

tree
build_reference_type (tree to_type)
{
  addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
					      : TYPE_ADDR_SPACE (to_type);
  machine_mode pointer_mode = targetm.addr_space.pointer_mode (as);
  return build_reference_type_for_mode (to_type, pointer_mode, false);
}

#define MAX_INT_CACHED_PREC \
  (HOST_BITS_PER_WIDE_INT > 64 ? HOST_BITS_PER_WIDE_INT : 64)
static GTY(()) tree nonstandard_integer_type_cache[2 * MAX_INT_CACHED_PREC + 2];

/* Builds a signed or unsigned integer type of precision PRECISION.
   Used for C bitfields whose precision does not match that of
   built-in target types.  */
tree
build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision,
				int unsignedp)
{
  tree itype, ret;

  if (unsignedp)
    unsignedp = MAX_INT_CACHED_PREC + 1;
    
  if (precision <= MAX_INT_CACHED_PREC)
    {
      itype = nonstandard_integer_type_cache[precision + unsignedp];
      if (itype)
	return itype;
    }

  itype = make_node (INTEGER_TYPE);
  TYPE_PRECISION (itype) = precision;

  if (unsignedp)
    fixup_unsigned_type (itype);
  else
    fixup_signed_type (itype);

  ret = itype;
  if (tree_fits_uhwi_p (TYPE_MAX_VALUE (itype)))
    ret = type_hash_canon (tree_to_uhwi (TYPE_MAX_VALUE (itype)), itype);
  if (precision <= MAX_INT_CACHED_PREC)
    nonstandard_integer_type_cache[precision + unsignedp] = ret;

  return ret;
}

/* Create a range of some discrete type TYPE (an INTEGER_TYPE, ENUMERAL_TYPE
   or BOOLEAN_TYPE) with low bound LOWVAL and high bound HIGHVAL.  If SHARED
   is true, reuse such a type that has already been constructed.  */

static tree
build_range_type_1 (tree type, tree lowval, tree highval, bool shared)
{
  tree itype = make_node (INTEGER_TYPE);
  inchash::hash hstate;

  TREE_TYPE (itype) = type;

  TYPE_MIN_VALUE (itype) = fold_convert (type, lowval);
  TYPE_MAX_VALUE (itype) = highval ? fold_convert (type, highval) : NULL;

  TYPE_PRECISION (itype) = TYPE_PRECISION (type);
  SET_TYPE_MODE (itype, TYPE_MODE (type));
  TYPE_SIZE (itype) = TYPE_SIZE (type);
  TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (type);
  TYPE_ALIGN (itype) = TYPE_ALIGN (type);
  TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (type);

  if (!shared)
    return itype;

  if ((TYPE_MIN_VALUE (itype)
       && TREE_CODE (TYPE_MIN_VALUE (itype)) != INTEGER_CST)
      || (TYPE_MAX_VALUE (itype)
	  && TREE_CODE (TYPE_MAX_VALUE (itype)) != INTEGER_CST))
    {
      /* Since we cannot reliably merge this type, we need to compare it using
	 structural equality checks.  */
      SET_TYPE_STRUCTURAL_EQUALITY (itype);
      return itype;
    }

  inchash::add_expr (TYPE_MIN_VALUE (itype), hstate);
  inchash::add_expr (TYPE_MAX_VALUE (itype), hstate);
  hstate.merge_hash (TYPE_HASH (type));
  itype = type_hash_canon (hstate.end (), itype);

  return itype;
}

/* Wrapper around build_range_type_1 with SHARED set to true.  */

tree
build_range_type (tree type, tree lowval, tree highval)
{
  return build_range_type_1 (type, lowval, highval, true);
}

/* Wrapper around build_range_type_1 with SHARED set to false.  */

tree
build_nonshared_range_type (tree type, tree lowval, tree highval)
{
  return build_range_type_1 (type, lowval, highval, false);
}

/* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
   MAXVAL should be the maximum value in the domain
   (one less than the length of the array).

   The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
   We don't enforce this limit, that is up to caller (e.g. language front end).
   The limit exists because the result is a signed type and we don't handle
   sizes that use more than one HOST_WIDE_INT.  */

tree
build_index_type (tree maxval)
{
  return build_range_type (sizetype, size_zero_node, maxval);
}

/* Return true if the debug information for TYPE, a subtype, should be emitted
   as a subrange type.  If so, set LOWVAL to the low bound and HIGHVAL to the
   high bound, respectively.  Sometimes doing so unnecessarily obfuscates the
   debug info and doesn't reflect the source code.  */

bool
subrange_type_for_debug_p (const_tree type, tree *lowval, tree *highval)
{
  tree base_type = TREE_TYPE (type), low, high;

  /* Subrange types have a base type which is an integral type.  */
  if (!INTEGRAL_TYPE_P (base_type))
    return false;

  /* Get the real bounds of the subtype.  */
  if (lang_hooks.types.get_subrange_bounds)
    lang_hooks.types.get_subrange_bounds (type, &low, &high);
  else
    {
      low = TYPE_MIN_VALUE (type);
      high = TYPE_MAX_VALUE (type);
    }

  /* If the type and its base type have the same representation and the same
     name, then the type is not a subrange but a copy of the base type.  */
  if ((TREE_CODE (base_type) == INTEGER_TYPE
       || TREE_CODE (base_type) == BOOLEAN_TYPE)
      && int_size_in_bytes (type) == int_size_in_bytes (base_type)
      && tree_int_cst_equal (low, TYPE_MIN_VALUE (base_type))
      && tree_int_cst_equal (high, TYPE_MAX_VALUE (base_type))
      && TYPE_IDENTIFIER (type) == TYPE_IDENTIFIER (base_type))
    return false;

  if (lowval)
    *lowval = low;
  if (highval)
    *highval = high;
  return true;
}

/* Construct, lay out and return the type of arrays of elements with ELT_TYPE
   and number of elements specified by the range of values of INDEX_TYPE.
   If SHARED is true, reuse such a type that has already been constructed.  */

static tree
build_array_type_1 (tree elt_type, tree index_type, bool shared)
{
  tree t;

  if (TREE_CODE (elt_type) == FUNCTION_TYPE)
    {
      error ("arrays of functions are not meaningful");
      elt_type = integer_type_node;
    }

  t = make_node (ARRAY_TYPE);
  TREE_TYPE (t) = elt_type;
  TYPE_DOMAIN (t) = index_type;
  TYPE_ADDR_SPACE (t) = TYPE_ADDR_SPACE (elt_type);
  layout_type (t);

  /* If the element type is incomplete at this point we get marked for
     structural equality.  Do not record these types in the canonical
     type hashtable.  */
  if (TYPE_STRUCTURAL_EQUALITY_P (t))
    return t;

  if (shared)
    {
      inchash::hash hstate;
      hstate.add_object (TYPE_HASH (elt_type));
      if (index_type)
	hstate.add_object (TYPE_HASH (index_type));
      t = type_hash_canon (hstate.end (), t);
    }

  if (TYPE_CANONICAL (t) == t)
    {
      if (TYPE_STRUCTURAL_EQUALITY_P (elt_type)
	  || (index_type && TYPE_STRUCTURAL_EQUALITY_P (index_type)))
	SET_TYPE_STRUCTURAL_EQUALITY (t);
      else if (TYPE_CANONICAL (elt_type) != elt_type
	       || (index_type && TYPE_CANONICAL (index_type) != index_type))
	TYPE_CANONICAL (t)
	  = build_array_type_1 (TYPE_CANONICAL (elt_type),
				index_type
				? TYPE_CANONICAL (index_type) : NULL_TREE,
				shared);
    }

  return t;
}

/* Wrapper around build_array_type_1 with SHARED set to true.  */

tree
build_array_type (tree elt_type, tree index_type)
{
  return build_array_type_1 (elt_type, index_type, true);
}

/* Wrapper around build_array_type_1 with SHARED set to false.  */

tree
build_nonshared_array_type (tree elt_type, tree index_type)
{
  return build_array_type_1 (elt_type, index_type, false);
}

/* Return a representation of ELT_TYPE[NELTS], using indices of type
   sizetype.  */

tree
build_array_type_nelts (tree elt_type, unsigned HOST_WIDE_INT nelts)
{
  return build_array_type (elt_type, build_index_type (size_int (nelts - 1)));
}

/* Recursively examines the array elements of TYPE, until a non-array
   element type is found.  */

tree
strip_array_types (tree type)
{
  while (TREE_CODE (type) == ARRAY_TYPE)
    type = TREE_TYPE (type);

  return type;
}

/* Computes the canonical argument types from the argument type list
   ARGTYPES.

   Upon return, *ANY_STRUCTURAL_P will be true iff either it was true
   on entry to this function, or if any of the ARGTYPES are
   structural.

   Upon return, *ANY_NONCANONICAL_P will be true iff either it was
   true on entry to this function, or if any of the ARGTYPES are
   non-canonical.

   Returns a canonical argument list, which may be ARGTYPES when the
   canonical argument list is unneeded (i.e., *ANY_STRUCTURAL_P is
   true) or would not differ from ARGTYPES.  */

static tree
maybe_canonicalize_argtypes (tree argtypes,
			     bool *any_structural_p,
			     bool *any_noncanonical_p)
{
  tree arg;
  bool any_noncanonical_argtypes_p = false;

  for (arg = argtypes; arg && !(*any_structural_p); arg = TREE_CHAIN (arg))
    {
      if (!TREE_VALUE (arg) || TREE_VALUE (arg) == error_mark_node)
	/* Fail gracefully by stating that the type is structural.  */
	*any_structural_p = true;
      else if (TYPE_STRUCTURAL_EQUALITY_P (TREE_VALUE (arg)))
	*any_structural_p = true;
      else if (TYPE_CANONICAL (TREE_VALUE (arg)) != TREE_VALUE (arg)
	       || TREE_PURPOSE (arg))
	/* If the argument has a default argument, we consider it
	   non-canonical even though the type itself is canonical.
	   That way, different variants of function and method types
	   with default arguments will all point to the variant with
	   no defaults as their canonical type.  */
        any_noncanonical_argtypes_p = true;
    }

  if (*any_structural_p)
    return argtypes;

  if (any_noncanonical_argtypes_p)
    {
      /* Build the canonical list of argument types.  */
      tree canon_argtypes = NULL_TREE;
      bool is_void = false;

      for (arg = argtypes; arg; arg = TREE_CHAIN (arg))
        {
          if (arg == void_list_node)
            is_void = true;
          else
            canon_argtypes = tree_cons (NULL_TREE,
                                        TYPE_CANONICAL (TREE_VALUE (arg)),
                                        canon_argtypes);
        }

      canon_argtypes = nreverse (canon_argtypes);
      if (is_void)
        canon_argtypes = chainon (canon_argtypes, void_list_node);

      /* There is a non-canonical type.  */
      *any_noncanonical_p = true;
      return canon_argtypes;
    }

  /* The canonical argument types are the same as ARGTYPES.  */
  return argtypes;
}

/* Construct, lay out and return
   the type of functions returning type VALUE_TYPE
   given arguments of types ARG_TYPES.
   ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
   are data type nodes for the arguments of the function.
   If such a type has already been constructed, reuse it.  */

tree
build_function_type (tree value_type, tree arg_types)
{
  tree t;
  inchash::hash hstate;
  bool any_structural_p, any_noncanonical_p;
  tree canon_argtypes;

  if (TREE_CODE (value_type) == FUNCTION_TYPE)
    {
      error ("function return type cannot be function");
      value_type = integer_type_node;
    }

  /* Make a node of the sort we want.  */
  t = make_node (FUNCTION_TYPE);
  TREE_TYPE (t) = value_type;
  TYPE_ARG_TYPES (t) = arg_types;

  /* If we already have such a type, use the old one.  */
  hstate.add_object (TYPE_HASH (value_type));
  type_hash_list (arg_types, hstate);
  t = type_hash_canon (hstate.end (), t);

  /* Set up the canonical type. */
  any_structural_p   = TYPE_STRUCTURAL_EQUALITY_P (value_type);
  any_noncanonical_p = TYPE_CANONICAL (value_type) != value_type;
  canon_argtypes = maybe_canonicalize_argtypes (arg_types,
						&any_structural_p,
						&any_noncanonical_p);
  if (any_structural_p)
    SET_TYPE_STRUCTURAL_EQUALITY (t);
  else if (any_noncanonical_p)
    TYPE_CANONICAL (t) = build_function_type (TYPE_CANONICAL (value_type),
					      canon_argtypes);

  if (!COMPLETE_TYPE_P (t))
    layout_type (t);
  return t;
}

/* Build a function type.  The RETURN_TYPE is the type returned by the
   function.  If VAARGS is set, no void_type_node is appended to the
   the list.  ARGP must be always be terminated be a NULL_TREE.  */

static tree
build_function_type_list_1 (bool vaargs, tree return_type, va_list argp)
{
  tree t, args, last;

  t = va_arg (argp, tree);
  for (args = NULL_TREE; t != NULL_TREE; t = va_arg (argp, tree))
    args = tree_cons (NULL_TREE, t, args);

  if (vaargs)
    {
      last = args;
      if (args != NULL_TREE)
	args = nreverse (args);
      gcc_assert (last != void_list_node);
    }
  else if (args == NULL_TREE)
    args = void_list_node;
  else
    {
      last = args;
      args = nreverse (args);
      TREE_CHAIN (last) = void_list_node;
    }
  args = build_function_type (return_type, args);

  return args;
}

/* Build a function type.  The RETURN_TYPE is the type returned by the
   function.  If additional arguments are provided, they are
   additional argument types.  The list of argument types must always
   be terminated by NULL_TREE.  */

tree
build_function_type_list (tree return_type, ...)
{
  tree args;
  va_list p;

  va_start (p, return_type);
  args = build_function_type_list_1 (false, return_type, p);
  va_end (p);
  return args;
}

/* Build a variable argument function type.  The RETURN_TYPE is the
   type returned by the function.  If additional arguments are provided,
   they are additional argument types.  The list of argument types must
   always be terminated by NULL_TREE.  */

tree
build_varargs_function_type_list (tree return_type, ...)
{
  tree args;
  va_list p;

  va_start (p, return_type);
  args = build_function_type_list_1 (true, return_type, p);
  va_end (p);

  return args;
}

/* Build a function type.  RETURN_TYPE is the type returned by the
   function; VAARGS indicates whether the function takes varargs.  The
   function takes N named arguments, the types of which are provided in
   ARG_TYPES.  */

static tree
build_function_type_array_1 (bool vaargs, tree return_type, int n,
			     tree *arg_types)
{
  int i;
  tree t = vaargs ? NULL_TREE : void_list_node;

  for (i = n - 1; i >= 0; i--)
    t = tree_cons (NULL_TREE, arg_types[i], t);

  return build_function_type (return_type, t);
}

/* Build a function type.  RETURN_TYPE is the type returned by the
   function.  The function takes N named arguments, the types of which
   are provided in ARG_TYPES.  */

tree
build_function_type_array (tree return_type, int n, tree *arg_types)
{
  return build_function_type_array_1 (false, return_type, n, arg_types);
}

/* Build a variable argument function type.  RETURN_TYPE is the type
   returned by the function.  The function takes N named arguments, the
   types of which are provided in ARG_TYPES.  */

tree
build_varargs_function_type_array (tree return_type, int n, tree *arg_types)
{
  return build_function_type_array_1 (true, return_type, n, arg_types);
}

/* Build a METHOD_TYPE for a member of BASETYPE.  The RETTYPE (a TYPE)
   and ARGTYPES (a TREE_LIST) are the return type and arguments types
   for the method.  An implicit additional parameter (of type
   pointer-to-BASETYPE) is added to the ARGTYPES.  */

tree
build_method_type_directly (tree basetype,
			    tree rettype,
			    tree argtypes)
{
  tree t;
  tree ptype;
  inchash::hash hstate;
  bool any_structural_p, any_noncanonical_p;
  tree canon_argtypes;

  /* Make a node of the sort we want.  */
  t = make_node (METHOD_TYPE);

  TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
  TREE_TYPE (t) = rettype;
  ptype = build_pointer_type (basetype);

  /* The actual arglist for this function includes a "hidden" argument
     which is "this".  Put it into the list of argument types.  */
  argtypes = tree_cons (NULL_TREE, ptype, argtypes);
  TYPE_ARG_TYPES (t) = argtypes;

  /* If we already have such a type, use the old one.  */
  hstate.add_object (TYPE_HASH (basetype));
  hstate.add_object (TYPE_HASH (rettype));
  type_hash_list (argtypes, hstate);
  t = type_hash_canon (hstate.end (), t);

  /* Set up the canonical type. */
  any_structural_p
    = (TYPE_STRUCTURAL_EQUALITY_P (basetype)
       || TYPE_STRUCTURAL_EQUALITY_P (rettype));
  any_noncanonical_p
    = (TYPE_CANONICAL (basetype) != basetype
       || TYPE_CANONICAL (rettype) != rettype);
  canon_argtypes = maybe_canonicalize_argtypes (TREE_CHAIN (argtypes),
						&any_structural_p,
						&any_noncanonical_p);
  if (any_structural_p)
    SET_TYPE_STRUCTURAL_EQUALITY (t);
  else if (any_noncanonical_p)
    TYPE_CANONICAL (t)
      = build_method_type_directly (TYPE_CANONICAL (basetype),
				    TYPE_CANONICAL (rettype),
				    canon_argtypes);
  if (!COMPLETE_TYPE_P (t))
    layout_type (t);

  return t;
}

/* Construct, lay out and return the type of methods belonging to class
   BASETYPE and whose arguments and values are described by TYPE.
   If that type exists already, reuse it.
   TYPE must be a FUNCTION_TYPE node.  */

tree
build_method_type (tree basetype, tree type)
{
  gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);

  return build_method_type_directly (basetype,
				     TREE_TYPE (type),
				     TYPE_ARG_TYPES (type));
}

/* Construct, lay out and return the type of offsets to a value
   of type TYPE, within an object of type BASETYPE.
   If a suitable offset type exists already, reuse it.  */

tree
build_offset_type (tree basetype, tree type)
{
  tree t;
  inchash::hash hstate;

  /* Make a node of the sort we want.  */
  t = make_node (OFFSET_TYPE);

  TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
  TREE_TYPE (t) = type;

  /* If we already have such a type, use the old one.  */
  hstate.add_object (TYPE_HASH (basetype));
  hstate.add_object (TYPE_HASH (type));
  t = type_hash_canon (hstate.end (), t);

  if (!COMPLETE_TYPE_P (t))
    layout_type (t);

  if (TYPE_CANONICAL (t) == t)
    {
      if (TYPE_STRUCTURAL_EQUALITY_P (basetype)
	  || TYPE_STRUCTURAL_EQUALITY_P (type))
	SET_TYPE_STRUCTURAL_EQUALITY (t);
      else if (TYPE_CANONICAL (TYPE_MAIN_VARIANT (basetype)) != basetype
	       || TYPE_CANONICAL (type) != type)
	TYPE_CANONICAL (t)
	  = build_offset_type (TYPE_CANONICAL (TYPE_MAIN_VARIANT (basetype)),
			       TYPE_CANONICAL (type));
    }

  return t;
}

/* Create a complex type whose components are COMPONENT_TYPE.  */

tree
build_complex_type (tree component_type)
{
  tree t;
  inchash::hash hstate;

  gcc_assert (INTEGRAL_TYPE_P (component_type)
	      || SCALAR_FLOAT_TYPE_P (component_type)
	      || FIXED_POINT_TYPE_P (component_type));

  /* Make a node of the sort we want.  */
  t = make_node (COMPLEX_TYPE);

  TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);

  /* If we already have such a type, use the old one.  */
  hstate.add_object (TYPE_HASH (component_type));
  t = type_hash_canon (hstate.end (), t);

  if (!COMPLETE_TYPE_P (t))
    layout_type (t);

  if (TYPE_CANONICAL (t) == t)
    {
      if (TYPE_STRUCTURAL_EQUALITY_P (component_type))
	SET_TYPE_STRUCTURAL_EQUALITY (t);
      else if (TYPE_CANONICAL (component_type) != component_type)
	TYPE_CANONICAL (t)
	  = build_complex_type (TYPE_CANONICAL (component_type));
    }

  /* We need to create a name, since complex is a fundamental type.  */
  if (! TYPE_NAME (t))
    {
      const char *name;
      if (component_type == char_type_node)
	name = "complex char";
      else if (component_type == signed_char_type_node)
	name = "complex signed char";
      else if (component_type == unsigned_char_type_node)
	name = "complex unsigned char";
      else if (component_type == short_integer_type_node)
	name = "complex short int";
      else if (component_type == short_unsigned_type_node)
	name = "complex short unsigned int";
      else if (component_type == integer_type_node)
	name = "complex int";
      else if (component_type == unsigned_type_node)
	name = "complex unsigned int";
      else if (component_type == long_integer_type_node)
	name = "complex long int";
      else if (component_type == long_unsigned_type_node)
	name = "complex long unsigned int";
      else if (component_type == long_long_integer_type_node)
	name = "complex long long int";
      else if (component_type == long_long_unsigned_type_node)
	name = "complex long long unsigned int";
      else
	name = 0;

      if (name != 0)
	TYPE_NAME (t) = build_decl (UNKNOWN_LOCATION, TYPE_DECL,
	    			    get_identifier (name), t);
    }

  return build_qualified_type (t, TYPE_QUALS (component_type));
}

/* If TYPE is a real or complex floating-point type and the target
   does not directly support arithmetic on TYPE then return the wider
   type to be used for arithmetic on TYPE.  Otherwise, return
   NULL_TREE.  */

tree
excess_precision_type (tree type)
{
  if (flag_excess_precision != EXCESS_PRECISION_FAST)
    {
      int flt_eval_method = TARGET_FLT_EVAL_METHOD;
      switch (TREE_CODE (type))
	{
	case REAL_TYPE:
	  switch (flt_eval_method)
	    {
	    case 1:
	      if (TYPE_MODE (type) == TYPE_MODE (float_type_node))
		return double_type_node;
	      break;
	    case 2:
	      if (TYPE_MODE (type) == TYPE_MODE (float_type_node)
		  || TYPE_MODE (type) == TYPE_MODE (double_type_node))
		return long_double_type_node;
	      break;
	    default:
	      gcc_unreachable ();
	    }
	  break;
	case COMPLEX_TYPE:
	  if (TREE_CODE (TREE_TYPE (type)) != REAL_TYPE)
	    return NULL_TREE;
	  switch (flt_eval_method)
	    {
	    case 1:
	      if (TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (float_type_node))
		return complex_double_type_node;
	      break;
	    case 2:
	      if (TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (float_type_node)
		  || (TYPE_MODE (TREE_TYPE (type))
		      == TYPE_MODE (double_type_node)))
		return complex_long_double_type_node;
	      break;
	    default:
	      gcc_unreachable ();
	    }
	  break;
	default:
	  break;
	}
    }
  return NULL_TREE;
}

/* Return OP, stripped of any conversions to wider types as much as is safe.
   Converting the value back to OP's type makes a value equivalent to OP.

   If FOR_TYPE is nonzero, we return a value which, if converted to
   type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.

   OP must have integer, real or enumeral type.  Pointers are not allowed!

   There are some cases where the obvious value we could return
   would regenerate to OP if converted to OP's type,
   but would not extend like OP to wider types.
   If FOR_TYPE indicates such extension is contemplated, we eschew such values.
   For example, if OP is (unsigned short)(signed char)-1,
   we avoid returning (signed char)-1 if FOR_TYPE is int,
   even though extending that to an unsigned short would regenerate OP,
   since the result of extending (signed char)-1 to (int)
   is different from (int) OP.  */

tree
get_unwidened (tree op, tree for_type)
{
  /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension.  */
  tree type = TREE_TYPE (op);
  unsigned final_prec
    = TYPE_PRECISION (for_type != 0 ? for_type : type);
  int uns
    = (for_type != 0 && for_type != type
       && final_prec > TYPE_PRECISION (type)
       && TYPE_UNSIGNED (type));
  tree win = op;

  while (CONVERT_EXPR_P (op))
    {
      int bitschange;

      /* TYPE_PRECISION on vector types has different meaning
	 (TYPE_VECTOR_SUBPARTS) and casts from vectors are view conversions,
	 so avoid them here.  */
      if (TREE_CODE (TREE_TYPE (TREE_OPERAND (op, 0))) == VECTOR_TYPE)
	break;

      bitschange = TYPE_PRECISION (TREE_TYPE (op))
		   - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));

      /* Truncations are many-one so cannot be removed.
	 Unless we are later going to truncate down even farther.  */
      if (bitschange < 0
	  && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
	break;

      /* See what's inside this conversion.  If we decide to strip it,
	 we will set WIN.  */
      op = TREE_OPERAND (op, 0);

      /* If we have not stripped any zero-extensions (uns is 0),
	 we can strip any kind of extension.
	 If we have previously stripped a zero-extension,
	 only zero-extensions can safely be stripped.
	 Any extension can be stripped if the bits it would produce
	 are all going to be discarded later by truncating to FOR_TYPE.  */

      if (bitschange > 0)
	{
	  if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
	    win = op;
	  /* TYPE_UNSIGNED says whether this is a zero-extension.
	     Let's avoid computing it if it does not affect WIN
	     and if UNS will not be needed again.  */
	  if ((uns
	       || CONVERT_EXPR_P (op))
	      && TYPE_UNSIGNED (TREE_TYPE (op)))
	    {
	      uns = 1;
	      win = op;
	    }
	}
    }

  /* If we finally reach a constant see if it fits in for_type and
     in that case convert it.  */
  if (for_type
      && TREE_CODE (win) == INTEGER_CST
      && TREE_TYPE (win) != for_type
      && int_fits_type_p (win, for_type))
    win = fold_convert (for_type, win);

  return win;
}

/* Return OP or a simpler expression for a narrower value
   which can be sign-extended or zero-extended to give back OP.
   Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
   or 0 if the value should be sign-extended.  */

tree
get_narrower (tree op, int *unsignedp_ptr)
{
  int uns = 0;
  int first = 1;
  tree win = op;
  bool integral_p = INTEGRAL_TYPE_P (TREE_TYPE (op));

  while (TREE_CODE (op) == NOP_EXPR)
    {
      int bitschange
	= (TYPE_PRECISION (TREE_TYPE (op))
	   - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))));

      /* Truncations are many-one so cannot be removed.  */
      if (bitschange < 0)
	break;

      /* See what's inside this conversion.  If we decide to strip it,
	 we will set WIN.  */

      if (bitschange > 0)
	{
	  op = TREE_OPERAND (op, 0);
	  /* An extension: the outermost one can be stripped,
	     but remember whether it is zero or sign extension.  */
	  if (first)
	    uns = TYPE_UNSIGNED (TREE_TYPE (op));
	  /* Otherwise, if a sign extension has been stripped,
	     only sign extensions can now be stripped;
	     if a zero extension has been stripped, only zero-extensions.  */
	  else if (uns != TYPE_UNSIGNED (TREE_TYPE (op)))
	    break;
	  first = 0;
	}
      else /* bitschange == 0 */
	{
	  /* A change in nominal type can always be stripped, but we must
	     preserve the unsignedness.  */
	  if (first)
	    uns = TYPE_UNSIGNED (TREE_TYPE (op));
	  first = 0;
	  op = TREE_OPERAND (op, 0);
	  /* Keep trying to narrow, but don't assign op to win if it
	     would turn an integral type into something else.  */
	  if (INTEGRAL_TYPE_P (TREE_TYPE (op)) != integral_p)
	    continue;
	}

      win = op;
    }

  if (TREE_CODE (op) == COMPONENT_REF
      /* Since type_for_size always gives an integer type.  */
      && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE
      && TREE_CODE (TREE_TYPE (op)) != FIXED_POINT_TYPE
      /* Ensure field is laid out already.  */
      && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
      && tree_fits_uhwi_p (DECL_SIZE (TREE_OPERAND (op, 1))))
    {
      unsigned HOST_WIDE_INT innerprec
	= tree_to_uhwi (DECL_SIZE (TREE_OPERAND (op, 1)));
      int unsignedp = (DECL_UNSIGNED (TREE_OPERAND (op, 1))
		       || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
      tree type = lang_hooks.types.type_for_size (innerprec, unsignedp);

      /* We can get this structure field in a narrower type that fits it,
	 but the resulting extension to its nominal type (a fullword type)
	 must satisfy the same conditions as for other extensions.

	 Do this only for fields that are aligned (not bit-fields),
	 because when bit-field insns will be used there is no
	 advantage in doing this.  */

      if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
	  && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
	  && (first || uns == DECL_UNSIGNED (TREE_OPERAND (op, 1)))
	  && type != 0)
	{
	  if (first)
	    uns = DECL_UNSIGNED (TREE_OPERAND (op, 1));
	  win = fold_convert (type, op);
	}
    }

  *unsignedp_ptr = uns;
  return win;
}

/* Returns true if integer constant C has a value that is permissible
   for type TYPE (an INTEGER_TYPE).  */

bool
int_fits_type_p (const_tree c, const_tree type)
{
  tree type_low_bound, type_high_bound;
  bool ok_for_low_bound, ok_for_high_bound;
  signop sgn_c = TYPE_SIGN (TREE_TYPE (c));

retry:
  type_low_bound = TYPE_MIN_VALUE (type);
  type_high_bound = TYPE_MAX_VALUE (type);

  /* If at least one bound of the type is a constant integer, we can check
     ourselves and maybe make a decision. If no such decision is possible, but
     this type is a subtype, try checking against that.  Otherwise, use
     fits_to_tree_p, which checks against the precision.

     Compute the status for each possibly constant bound, and return if we see
     one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
     for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
     for "constant known to fit".  */

  /* Check if c >= type_low_bound.  */
  if (type_low_bound && TREE_CODE (type_low_bound) == INTEGER_CST)
    {
      if (tree_int_cst_lt (c, type_low_bound))
	return false;
      ok_for_low_bound = true;
    }
  else
    ok_for_low_bound = false;

  /* Check if c <= type_high_bound.  */
  if (type_high_bound && TREE_CODE (type_high_bound) == INTEGER_CST)
    {
      if (tree_int_cst_lt (type_high_bound, c))
	return false;
      ok_for_high_bound = true;
    }
  else
    ok_for_high_bound = false;

  /* If the constant fits both bounds, the result is known.  */
  if (ok_for_low_bound && ok_for_high_bound)
    return true;

  /* Perform some generic filtering which may allow making a decision
     even if the bounds are not constant.  First, negative integers
     never fit in unsigned types, */
  if (TYPE_UNSIGNED (type) && sgn_c == SIGNED && wi::neg_p (c))
    return false;

  /* Second, narrower types always fit in wider ones.  */
  if (TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (c)))
    return true;

  /* Third, unsigned integers with top bit set never fit signed types.  */
  if (!TYPE_UNSIGNED (type) && sgn_c == UNSIGNED)
    {
      int prec = GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (c))) - 1;
      if (prec < TYPE_PRECISION (TREE_TYPE (c)))
	{
	  /* When a tree_cst is converted to a wide-int, the precision
	     is taken from the type.  However, if the precision of the
	     mode underneath the type is smaller than that, it is
	     possible that the value will not fit.  The test below
	     fails if any bit is set between the sign bit of the
	     underlying mode and the top bit of the type.  */
	  if (wi::ne_p (wi::zext (c, prec - 1), c))
	    return false;
	}
      else if (wi::neg_p (c))
	return false;
    }

  /* If we haven't been able to decide at this point, there nothing more we
     can check ourselves here.  Look at the base type if we have one and it
     has the same precision.  */
  if (TREE_CODE (type) == INTEGER_TYPE
      && TREE_TYPE (type) != 0
      && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (type)))
    {
      type = TREE_TYPE (type);
      goto retry;
    }

  /* Or to fits_to_tree_p, if nothing else.  */
  return wi::fits_to_tree_p (c, type);
}

/* Stores bounds of an integer TYPE in MIN and MAX.  If TYPE has non-constant
   bounds or is a POINTER_TYPE, the maximum and/or minimum values that can be
   represented (assuming two's-complement arithmetic) within the bit
   precision of the type are returned instead.  */

void
get_type_static_bounds (const_tree type, mpz_t min, mpz_t max)
{
  if (!POINTER_TYPE_P (type) && TYPE_MIN_VALUE (type)
      && TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST)
    wi::to_mpz (TYPE_MIN_VALUE (type), min, TYPE_SIGN (type));
  else
    {
      if (TYPE_UNSIGNED (type))
	mpz_set_ui (min, 0);
      else
	{
	  wide_int mn = wi::min_value (TYPE_PRECISION (type), SIGNED);
	  wi::to_mpz (mn, min, SIGNED);
	}
    }

  if (!POINTER_TYPE_P (type) && TYPE_MAX_VALUE (type)
      && TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST)
    wi::to_mpz (TYPE_MAX_VALUE (type), max, TYPE_SIGN (type));
  else
    {
      wide_int mn = wi::max_value (TYPE_PRECISION (type), TYPE_SIGN (type));
      wi::to_mpz (mn, max, TYPE_SIGN (type));
    }
}

/* Return true if VAR is an automatic variable defined in function FN.  */

bool
auto_var_in_fn_p (const_tree var, const_tree fn)
{
  return (DECL_P (var) && DECL_CONTEXT (var) == fn
	  && ((((TREE_CODE (var) == VAR_DECL && ! DECL_EXTERNAL (var))
		|| TREE_CODE (var) == PARM_DECL)
	       && ! TREE_STATIC (var))
	      || TREE_CODE (var) == LABEL_DECL
	      || TREE_CODE (var) == RESULT_DECL));
}

/* Subprogram of following function.  Called by walk_tree.

   Return *TP if it is an automatic variable or parameter of the
   function passed in as DATA.  */

static tree
find_var_from_fn (tree *tp, int *walk_subtrees, void *data)
{
  tree fn = (tree) data;

  if (TYPE_P (*tp))
    *walk_subtrees = 0;

  else if (DECL_P (*tp)
	   && auto_var_in_fn_p (*tp, fn))
    return *tp;

  return NULL_TREE;
}

/* Returns true if T is, contains, or refers to a type with variable
   size.  For METHOD_TYPEs and FUNCTION_TYPEs we exclude the
   arguments, but not the return type.  If FN is nonzero, only return
   true if a modifier of the type or position of FN is a variable or
   parameter inside FN.

   This concept is more general than that of C99 'variably modified types':
   in C99, a struct type is never variably modified because a VLA may not
   appear as a structure member.  However, in GNU C code like:

     struct S { int i[f()]; };

   is valid, and other languages may define similar constructs.  */

bool
variably_modified_type_p (tree type, tree fn)
{
  tree t;

/* Test if T is either variable (if FN is zero) or an expression containing
   a variable in FN.  If TYPE isn't gimplified, return true also if
   gimplify_one_sizepos would gimplify the expression into a local
   variable.  */
#define RETURN_TRUE_IF_VAR(T)						\
  do { tree _t = (T);							\
    if (_t != NULL_TREE							\
	&& _t != error_mark_node					\
	&& TREE_CODE (_t) != INTEGER_CST				\
	&& TREE_CODE (_t) != PLACEHOLDER_EXPR				\
	&& (!fn								\
	    || (!TYPE_SIZES_GIMPLIFIED (type)				\
		&& !is_gimple_sizepos (_t))				\
	    || walk_tree (&_t, find_var_from_fn, fn, NULL)))		\
      return true;  } while (0)

  if (type == error_mark_node)
    return false;

  /* If TYPE itself has variable size, it is variably modified.  */
  RETURN_TRUE_IF_VAR (TYPE_SIZE (type));
  RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (type));

  switch (TREE_CODE (type))
    {
    case POINTER_TYPE:
    case REFERENCE_TYPE:
    case VECTOR_TYPE:
      if (variably_modified_type_p (TREE_TYPE (type), fn))
	return true;
      break;

    case FUNCTION_TYPE:
    case METHOD_TYPE:
      /* If TYPE is a function type, it is variably modified if the
	 return type is variably modified.  */
      if (variably_modified_type_p (TREE_TYPE (type), fn))
	  return true;
      break;

    case INTEGER_TYPE:
    case REAL_TYPE:
    case FIXED_POINT_TYPE:
    case ENUMERAL_TYPE:
    case BOOLEAN_TYPE:
      /* Scalar types are variably modified if their end points
	 aren't constant.  */
      RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type));
      RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type));
      break;

    case RECORD_TYPE:
    case UNION_TYPE:
    case QUAL_UNION_TYPE:
      /* We can't see if any of the fields are variably-modified by the
	 definition we normally use, since that would produce infinite
	 recursion via pointers.  */
      /* This is variably modified if some field's type is.  */
      for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
	if (TREE_CODE (t) == FIELD_DECL)
	  {
	    RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t));
	    RETURN_TRUE_IF_VAR (DECL_SIZE (t));
	    RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t));

	    if (TREE_CODE (type) == QUAL_UNION_TYPE)
	      RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t));
	  }
      break;

    case ARRAY_TYPE:
      /* Do not call ourselves to avoid infinite recursion.  This is
	 variably modified if the element type is.  */
      RETURN_TRUE_IF_VAR (TYPE_SIZE (TREE_TYPE (type)));
      RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (TREE_TYPE (type)));
      break;

    default:
      break;
    }

  /* The current language may have other cases to check, but in general,
     all other types are not variably modified.  */
  return lang_hooks.tree_inlining.var_mod_type_p (type, fn);

#undef RETURN_TRUE_IF_VAR
}

/* Given a DECL or TYPE, return the scope in which it was declared, or
   NULL_TREE if there is no containing scope.  */

tree
get_containing_scope (const_tree t)
{
  return (TYPE_P (t) ? TYPE_CONTEXT (t) : DECL_CONTEXT (t));
}

/* Return the innermost context enclosing DECL that is
   a FUNCTION_DECL, or zero if none.  */

tree
decl_function_context (const_tree decl)
{
  tree context;

  if (TREE_CODE (decl) == ERROR_MARK)
    return 0;

  /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
     where we look up the function at runtime.  Such functions always take
     a first argument of type 'pointer to real context'.

     C++ should really be fixed to use DECL_CONTEXT for the real context,
     and use something else for the "virtual context".  */
  else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VINDEX (decl))
    context
      = TYPE_MAIN_VARIANT
	(TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
  else
    context = DECL_CONTEXT (decl);

  while (context && TREE_CODE (context) != FUNCTION_DECL)
    {
      if (TREE_CODE (context) == BLOCK)
	context = BLOCK_SUPERCONTEXT (context);
      else
	context = get_containing_scope (context);
    }

  return context;
}

/* Return the innermost context enclosing DECL that is
   a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
   TYPE_DECLs and FUNCTION_DECLs are transparent to this function.  */

tree
decl_type_context (const_tree decl)
{
  tree context = DECL_CONTEXT (decl);

  while (context)
    switch (TREE_CODE (context))
      {
      case NAMESPACE_DECL:
      case TRANSLATION_UNIT_DECL:
	return NULL_TREE;

      case RECORD_TYPE:
      case UNION_TYPE:
      case QUAL_UNION_TYPE:
	return context;

      case TYPE_DECL:
      case FUNCTION_DECL:
	context = DECL_CONTEXT (context);
	break;

      case BLOCK:
	context = BLOCK_SUPERCONTEXT (context);
	break;

      default:
	gcc_unreachable ();
      }

  return NULL_TREE;
}

/* CALL is a CALL_EXPR.  Return the declaration for the function
   called, or NULL_TREE if the called function cannot be
   determined.  */

tree
get_callee_fndecl (const_tree call)
{
  tree addr;

  if (call == error_mark_node)
    return error_mark_node;

  /* It's invalid to call this function with anything but a
     CALL_EXPR.  */
  gcc_assert (TREE_CODE (call) == CALL_EXPR);

  /* The first operand to the CALL is the address of the function
     called.  */
  addr = CALL_EXPR_FN (call);

  /* If there is no function, return early.  */
  if (addr == NULL_TREE)
    return NULL_TREE;

  STRIP_NOPS (addr);

  /* If this is a readonly function pointer, extract its initial value.  */
  if (DECL_P (addr) && TREE_CODE (addr) != FUNCTION_DECL
      && TREE_READONLY (addr) && ! TREE_THIS_VOLATILE (addr)
      && DECL_INITIAL (addr))
    addr = DECL_INITIAL (addr);

  /* If the address is just `&f' for some function `f', then we know
     that `f' is being called.  */
  if (TREE_CODE (addr) == ADDR_EXPR
      && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL)
    return TREE_OPERAND (addr, 0);

  /* We couldn't figure out what was being called.  */
  return NULL_TREE;
}

#define TREE_MEM_USAGE_SPACES 40

/* Print debugging information about tree nodes generated during the compile,
   and any language-specific information.  */

void
dump_tree_statistics (void)
{
  if (GATHER_STATISTICS)
    {
      int i;
      int total_nodes, total_bytes;
      fprintf (stderr, "\nKind                   Nodes      Bytes\n");
      mem_usage::print_dash_line (TREE_MEM_USAGE_SPACES);
      total_nodes = total_bytes = 0;
      for (i = 0; i < (int) all_kinds; i++)
	{
	  fprintf (stderr, "%-20s %7d %10d\n", tree_node_kind_names[i],
		   tree_node_counts[i], tree_node_sizes[i]);
	  total_nodes += tree_node_counts[i];
	  total_bytes += tree_node_sizes[i];
	}
      mem_usage::print_dash_line (TREE_MEM_USAGE_SPACES);
      fprintf (stderr, "%-20s %7d %10d\n", "Total", total_nodes, total_bytes);
      mem_usage::print_dash_line (TREE_MEM_USAGE_SPACES);
      fprintf (stderr, "Code                   Nodes\n");
      mem_usage::print_dash_line (TREE_MEM_USAGE_SPACES);
      for (i = 0; i < (int) MAX_TREE_CODES; i++)
	fprintf (stderr, "%-32s %7d\n", get_tree_code_name ((enum tree_code) i),
                 tree_code_counts[i]);
      mem_usage::print_dash_line (TREE_MEM_USAGE_SPACES);
      fprintf (stderr, "\n");
      ssanames_print_statistics ();
      fprintf (stderr, "\n");
      phinodes_print_statistics ();
      fprintf (stderr, "\n");
    }
  else
    fprintf (stderr, "(No per-node statistics)\n");

  print_type_hash_statistics ();
  print_debug_expr_statistics ();
  print_value_expr_statistics ();
  lang_hooks.print_statistics ();
}

#define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"

/* Generate a crc32 of a byte.  */

static unsigned
crc32_unsigned_bits (unsigned chksum, unsigned value, unsigned bits)
{
  unsigned ix;

  for (ix = bits; ix--; value <<= 1)
    {
      unsigned feedback;
      
      feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
      chksum <<= 1;
      chksum ^= feedback;
    }
  return chksum;
}

/* Generate a crc32 of a 32-bit unsigned.  */

unsigned
crc32_unsigned (unsigned chksum, unsigned value)
{
  return crc32_unsigned_bits (chksum, value, 32);
}

/* Generate a crc32 of a byte.  */

unsigned
crc32_byte (unsigned chksum, char byte)
{
  return crc32_unsigned_bits (chksum, (unsigned) byte << 24, 8);
}

/* Generate a crc32 of a string.  */

unsigned
crc32_string (unsigned chksum, const char *string)
{
  do
    {
      chksum = crc32_byte (chksum, *string);
    }
  while (*string++);
  return chksum;
}

/* P is a string that will be used in a symbol.  Mask out any characters
   that are not valid in that context.  */

void
clean_symbol_name (char *p)
{
  for (; *p; p++)
    if (! (ISALNUM (*p)
#ifndef NO_DOLLAR_IN_LABEL	/* this for `$'; unlikely, but... -- kr */
	    || *p == '$'
#endif
#ifndef NO_DOT_IN_LABEL		/* this for `.'; unlikely, but...  */
	    || *p == '.'
#endif
	   ))
      *p = '_';
}

/* For anonymous aggregate types, we need some sort of name to
   hold on to.  In practice, this should not appear, but it should
   not be harmful if it does.  */
bool 
anon_aggrname_p(const_tree id_node)
{
#ifndef NO_DOT_IN_LABEL
 return (IDENTIFIER_POINTER (id_node)[0] == '.'
	 && IDENTIFIER_POINTER (id_node)[1] == '_');
#else /* NO_DOT_IN_LABEL */
#ifndef NO_DOLLAR_IN_LABEL
  return (IDENTIFIER_POINTER (id_node)[0] == '$' \
	  && IDENTIFIER_POINTER (id_node)[1] == '_');
#else /* NO_DOLLAR_IN_LABEL */
#define ANON_AGGRNAME_PREFIX "__anon_"
  return (!strncmp (IDENTIFIER_POINTER (id_node), ANON_AGGRNAME_PREFIX, 
		    sizeof (ANON_AGGRNAME_PREFIX) - 1));
#endif	/* NO_DOLLAR_IN_LABEL */
#endif	/* NO_DOT_IN_LABEL */
}

/* Return a format for an anonymous aggregate name.  */
const char *
anon_aggrname_format()
{
#ifndef NO_DOT_IN_LABEL
 return "._%d";
#else /* NO_DOT_IN_LABEL */
#ifndef NO_DOLLAR_IN_LABEL
  return "$_%d";
#else /* NO_DOLLAR_IN_LABEL */
  return "__anon_%d";
#endif	/* NO_DOLLAR_IN_LABEL */
#endif	/* NO_DOT_IN_LABEL */
}

/* Generate a name for a special-purpose function.
   The generated name may need to be unique across the whole link.
   Changes to this function may also require corresponding changes to
   xstrdup_mask_random.
   TYPE is some string to identify the purpose of this function to the
   linker or collect2; it must start with an uppercase letter,
   one of:
   I - for constructors
   D - for destructors
   N - for C++ anonymous namespaces
   F - for DWARF unwind frame information.  */

tree
get_file_function_name (const char *type)
{
  char *buf;
  const char *p;
  char *q;

  /* If we already have a name we know to be unique, just use that.  */
  if (first_global_object_name)
    p = q = ASTRDUP (first_global_object_name);
  /* If the target is handling the constructors/destructors, they
     will be local to this file and the name is only necessary for
     debugging purposes. 
     We also assign sub_I and sub_D sufixes to constructors called from
     the global static constructors.  These are always local.  */
  else if (((type[0] == 'I' || type[0] == 'D') && targetm.have_ctors_dtors)
	   || (strncmp (type, "sub_", 4) == 0
	       && (type[4] == 'I' || type[4] == 'D')))
    {
      const char *file = main_input_filename;
      if (! file)
	file = LOCATION_FILE (input_location);
      /* Just use the file's basename, because the full pathname
	 might be quite long.  */
      p = q = ASTRDUP (lbasename (file));
    }
  else
    {
      /* Otherwise, the name must be unique across the entire link.
	 We don't have anything that we know to be unique to this translation
	 unit, so use what we do have and throw in some randomness.  */
      unsigned len;
      const char *name = weak_global_object_name;
      const char *file = main_input_filename;

      if (! name)
	name = "";
      if (! file)
	file = LOCATION_FILE (input_location);

      len = strlen (file);
      q = (char *) alloca (9 + 17 + len + 1);
      memcpy (q, file, len + 1);

      snprintf (q + len, 9 + 17 + 1, "_%08X_" HOST_WIDE_INT_PRINT_HEX, 
		crc32_string (0, name), get_random_seed (false));

      p = q;
    }

  clean_symbol_name (q);
  buf = (char *) alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p)
			 + strlen (type));

  /* Set up the name of the file-level functions we may need.
     Use a global object (which is already required to be unique over
     the program) rather than the file name (which imposes extra
     constraints).  */
  sprintf (buf, FILE_FUNCTION_FORMAT, type, p);

  return get_identifier (buf);
}

#if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)

/* Complain that the tree code of NODE does not match the expected 0
   terminated list of trailing codes. The trailing code list can be
   empty, for a more vague error message.  FILE, LINE, and FUNCTION
   are of the caller.  */

void
tree_check_failed (const_tree node, const char *file,
		   int line, const char *function, ...)
{
  va_list args;
  const char *buffer;
  unsigned length = 0;
  enum tree_code code;

  va_start (args, function);
  while ((code = (enum tree_code) va_arg (args, int)))
    length += 4 + strlen (get_tree_code_name (code));
  va_end (args);
  if (length)
    {
      char *tmp;
      va_start (args, function);
      length += strlen ("expected ");
      buffer = tmp = (char *) alloca (length);
      length = 0;
      while ((code = (enum tree_code) va_arg (args, int)))
	{
	  const char *prefix = length ? " or " : "expected ";

	  strcpy (tmp + length, prefix);
	  length += strlen (prefix);
	  strcpy (tmp + length, get_tree_code_name (code));
	  length += strlen (get_tree_code_name (code));
	}
      va_end (args);
    }
  else
    buffer = "unexpected node";

  internal_error ("tree check: %s, have %s in %s, at %s:%d",
		  buffer, get_tree_code_name (TREE_CODE (node)),
		  function, trim_filename (file), line);
}

/* Complain that the tree code of NODE does match the expected 0
   terminated list of trailing codes. FILE, LINE, and FUNCTION are of
   the caller.  */

void
tree_not_check_failed (const_tree node, const char *file,
		       int line, const char *function, ...)
{
  va_list args;
  char *buffer;
  unsigned length = 0;
  enum tree_code code;

  va_start (args, function);
  while ((code = (enum tree_code) va_arg (args, int)))
    length += 4 + strlen (get_tree_code_name (code));
  va_end (args);
  va_start (args, function);
  buffer = (char *) alloca (length);
  length = 0;
  while ((code = (enum tree_code) va_arg (args, int)))
    {
      if (length)
	{
	  strcpy (buffer + length, " or ");
	  length += 4;
	}
      strcpy (buffer + length, get_tree_code_name (code));
      length += strlen (get_tree_code_name (code));
    }
  va_end (args);

  internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
		  buffer, get_tree_code_name (TREE_CODE (node)),
		  function, trim_filename (file), line);
}

/* Similar to tree_check_failed, except that we check for a class of tree
   code, given in CL.  */

void
tree_class_check_failed (const_tree node, const enum tree_code_class cl,
			 const char *file, int line, const char *function)
{
  internal_error
    ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
     TREE_CODE_CLASS_STRING (cl),
     TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node))),
     get_tree_code_name (TREE_CODE (node)), function, trim_filename (file), line);
}

/* Similar to tree_check_failed, except that instead of specifying a
   dozen codes, use the knowledge that they're all sequential.  */

void
tree_range_check_failed (const_tree node, const char *file, int line,
			 const char *function, enum tree_code c1,
			 enum tree_code c2)
{
  char *buffer;
  unsigned length = 0;
  unsigned int c;

  for (c = c1; c <= c2; ++c)
    length += 4 + strlen (get_tree_code_name ((enum tree_code) c));

  length += strlen ("expected ");
  buffer = (char *) alloca (length);
  length = 0;

  for (c = c1; c <= c2; ++c)
    {
      const char *prefix = length ? " or " : "expected ";

      strcpy (buffer + length, prefix);
      length += strlen (prefix);
      strcpy (buffer + length, get_tree_code_name ((enum tree_code) c));
      length += strlen (get_tree_code_name ((enum tree_code) c));
    }

  internal_error ("tree check: %s, have %s in %s, at %s:%d",
		  buffer, get_tree_code_name (TREE_CODE (node)),
		  function, trim_filename (file), line);
}


/* Similar to tree_check_failed, except that we check that a tree does
   not have the specified code, given in CL.  */

void
tree_not_class_check_failed (const_tree node, const enum tree_code_class cl,
			     const char *file, int line, const char *function)
{
  internal_error
    ("tree check: did not expect class %qs, have %qs (%s) in %s, at %s:%d",
     TREE_CODE_CLASS_STRING (cl),
     TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node))),
     get_tree_code_name (TREE_CODE (node)), function, trim_filename (file), line);
}


/* Similar to tree_check_failed but applied to OMP_CLAUSE codes.  */

void
omp_clause_check_failed (const_tree node, const char *file, int line,
                         const char *function, enum omp_clause_code code)
{
  internal_error ("tree check: expected omp_clause %s, have %s in %s, at %s:%d",
		  omp_clause_code_name[code], get_tree_code_name (TREE_CODE (node)),
		  function, trim_filename (file), line);
}


/* Similar to tree_range_check_failed but applied to OMP_CLAUSE codes.  */

void
omp_clause_range_check_failed (const_tree node, const char *file, int line,
			       const char *function, enum omp_clause_code c1,
			       enum omp_clause_code c2)
{
  char *buffer;
  unsigned length = 0;
  unsigned int c;

  for (c = c1; c <= c2; ++c)
    length += 4 + strlen (omp_clause_code_name[c]);

  length += strlen ("expected ");
  buffer = (char *) alloca (length);
  length = 0;


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