364 lines
8.2 KiB
C
364 lines
8.2 KiB
C
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/* Iterator routines for manipulating GENERIC and GIMPLE tree statements.
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Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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Contributed by Andrew MacLeod <amacleod@redhat.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tree.h"
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#include "tree-gimple.h"
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#include "tree-iterator.h"
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#include "ggc.h"
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/* This is a cache of STATEMENT_LIST nodes. We create and destroy them
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fairly often during gimplification. */
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static GTY ((deletable (""))) tree stmt_list_cache;
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tree
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alloc_stmt_list (void)
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{
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tree list = stmt_list_cache;
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if (list)
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{
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stmt_list_cache = TREE_CHAIN (list);
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gcc_assert (stmt_list_cache != list);
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memset (list, 0, sizeof(struct tree_common));
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TREE_SET_CODE (list, STATEMENT_LIST);
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}
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else
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list = make_node (STATEMENT_LIST);
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TREE_TYPE (list) = void_type_node;
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return list;
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}
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void
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free_stmt_list (tree t)
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{
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gcc_assert (!STATEMENT_LIST_HEAD (t));
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gcc_assert (!STATEMENT_LIST_TAIL (t));
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/* If this triggers, it's a sign that the same list is being freed
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twice. */
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gcc_assert (t != stmt_list_cache || stmt_list_cache == NULL);
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TREE_CHAIN (t) = stmt_list_cache;
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stmt_list_cache = t;
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}
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/* Links a statement, or a chain of statements, before the current stmt. */
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void
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tsi_link_before (tree_stmt_iterator *i, tree t, enum tsi_iterator_update mode)
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{
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struct tree_statement_list_node *head, *tail, *cur;
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/* Die on looping. */
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gcc_assert (t != i->container);
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if (TREE_CODE (t) == STATEMENT_LIST)
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{
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head = STATEMENT_LIST_HEAD (t);
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tail = STATEMENT_LIST_TAIL (t);
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STATEMENT_LIST_HEAD (t) = NULL;
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STATEMENT_LIST_TAIL (t) = NULL;
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free_stmt_list (t);
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/* Empty statement lists need no work. */
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if (!head || !tail)
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{
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gcc_assert (head == tail);
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return;
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}
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}
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else
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{
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head = ggc_alloc (sizeof (*head));
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head->prev = NULL;
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head->next = NULL;
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head->stmt = t;
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tail = head;
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}
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TREE_SIDE_EFFECTS (i->container) = 1;
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cur = i->ptr;
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/* Link it into the list. */
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if (cur)
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{
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head->prev = cur->prev;
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if (head->prev)
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head->prev->next = head;
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else
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STATEMENT_LIST_HEAD (i->container) = head;
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tail->next = cur;
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cur->prev = tail;
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}
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else
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{
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head->prev = STATEMENT_LIST_TAIL (i->container);
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if (head->prev)
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head->prev->next = head;
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else
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STATEMENT_LIST_HEAD (i->container) = head;
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STATEMENT_LIST_TAIL (i->container) = tail;
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}
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/* Update the iterator, if requested. */
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switch (mode)
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{
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case TSI_NEW_STMT:
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case TSI_CONTINUE_LINKING:
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case TSI_CHAIN_START:
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i->ptr = head;
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break;
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case TSI_CHAIN_END:
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i->ptr = tail;
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break;
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case TSI_SAME_STMT:
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break;
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}
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}
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/* Links a statement, or a chain of statements, after the current stmt. */
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void
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tsi_link_after (tree_stmt_iterator *i, tree t, enum tsi_iterator_update mode)
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{
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struct tree_statement_list_node *head, *tail, *cur;
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/* Die on looping. */
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gcc_assert (t != i->container);
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if (TREE_CODE (t) == STATEMENT_LIST)
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{
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head = STATEMENT_LIST_HEAD (t);
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tail = STATEMENT_LIST_TAIL (t);
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STATEMENT_LIST_HEAD (t) = NULL;
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STATEMENT_LIST_TAIL (t) = NULL;
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free_stmt_list (t);
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/* Empty statement lists need no work. */
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if (!head || !tail)
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{
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gcc_assert (head == tail);
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return;
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}
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}
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else
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{
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head = ggc_alloc (sizeof (*head));
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head->prev = NULL;
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head->next = NULL;
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head->stmt = t;
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tail = head;
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}
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TREE_SIDE_EFFECTS (i->container) = 1;
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cur = i->ptr;
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/* Link it into the list. */
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if (cur)
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{
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tail->next = cur->next;
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if (tail->next)
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tail->next->prev = tail;
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else
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STATEMENT_LIST_TAIL (i->container) = tail;
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head->prev = cur;
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cur->next = head;
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}
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else
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{
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gcc_assert (!STATEMENT_LIST_TAIL (i->container));
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STATEMENT_LIST_HEAD (i->container) = head;
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STATEMENT_LIST_TAIL (i->container) = tail;
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}
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/* Update the iterator, if requested. */
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switch (mode)
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{
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case TSI_NEW_STMT:
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case TSI_CHAIN_START:
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i->ptr = head;
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break;
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case TSI_CONTINUE_LINKING:
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case TSI_CHAIN_END:
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i->ptr = tail;
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break;
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case TSI_SAME_STMT:
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gcc_assert (cur);
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break;
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}
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}
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/* Remove a stmt from the tree list. The iterator is updated to point to
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the next stmt. */
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void
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tsi_delink (tree_stmt_iterator *i)
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{
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struct tree_statement_list_node *cur, *next, *prev;
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cur = i->ptr;
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next = cur->next;
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prev = cur->prev;
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if (prev)
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prev->next = next;
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else
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STATEMENT_LIST_HEAD (i->container) = next;
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if (next)
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next->prev = prev;
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else
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STATEMENT_LIST_TAIL (i->container) = prev;
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if (!next && !prev)
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TREE_SIDE_EFFECTS (i->container) = 0;
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i->ptr = next;
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}
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/* Move all statements in the statement list after I to a new
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statement list. I itself is unchanged. */
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tree
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tsi_split_statement_list_after (const tree_stmt_iterator *i)
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{
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struct tree_statement_list_node *cur, *next;
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tree old_sl, new_sl;
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cur = i->ptr;
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/* How can we possibly split after the end, or before the beginning? */
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gcc_assert (cur);
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next = cur->next;
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old_sl = i->container;
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new_sl = alloc_stmt_list ();
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TREE_SIDE_EFFECTS (new_sl) = 1;
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STATEMENT_LIST_HEAD (new_sl) = next;
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STATEMENT_LIST_TAIL (new_sl) = STATEMENT_LIST_TAIL (old_sl);
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STATEMENT_LIST_TAIL (old_sl) = cur;
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cur->next = NULL;
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next->prev = NULL;
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return new_sl;
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}
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/* Move all statements in the statement list before I to a new
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statement list. I is set to the head of the new list. */
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tree
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tsi_split_statement_list_before (tree_stmt_iterator *i)
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{
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struct tree_statement_list_node *cur, *prev;
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tree old_sl, new_sl;
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cur = i->ptr;
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/* How can we possibly split after the end, or before the beginning? */
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gcc_assert (cur);
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prev = cur->prev;
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old_sl = i->container;
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new_sl = alloc_stmt_list ();
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TREE_SIDE_EFFECTS (new_sl) = 1;
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i->container = new_sl;
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STATEMENT_LIST_HEAD (new_sl) = cur;
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STATEMENT_LIST_TAIL (new_sl) = STATEMENT_LIST_TAIL (old_sl);
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STATEMENT_LIST_TAIL (old_sl) = prev;
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cur->prev = NULL;
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if (prev)
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prev->next = NULL;
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return new_sl;
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}
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/* Return the first expression in a sequence of COMPOUND_EXPRs,
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or in a STATEMENT_LIST. */
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tree
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expr_first (tree expr)
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{
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if (expr == NULL_TREE)
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return expr;
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if (TREE_CODE (expr) == STATEMENT_LIST)
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{
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struct tree_statement_list_node *n = STATEMENT_LIST_HEAD (expr);
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return n ? n->stmt : NULL_TREE;
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}
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while (TREE_CODE (expr) == COMPOUND_EXPR)
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expr = TREE_OPERAND (expr, 0);
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return expr;
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}
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/* Return the last expression in a sequence of COMPOUND_EXPRs,
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or in a STATEMENT_LIST. */
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tree
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expr_last (tree expr)
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{
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if (expr == NULL_TREE)
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return expr;
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if (TREE_CODE (expr) == STATEMENT_LIST)
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{
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struct tree_statement_list_node *n = STATEMENT_LIST_TAIL (expr);
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return n ? n->stmt : NULL_TREE;
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}
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while (TREE_CODE (expr) == COMPOUND_EXPR)
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expr = TREE_OPERAND (expr, 1);
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return expr;
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}
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/* If EXPR is a single statement return it. If EXPR is a
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STATEMENT_LIST containing exactly one statement S, return S.
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Otherwise, return NULL. */
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tree
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expr_only (tree expr)
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{
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if (expr == NULL_TREE)
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return NULL_TREE;
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if (TREE_CODE (expr) == STATEMENT_LIST)
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{
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struct tree_statement_list_node *n = STATEMENT_LIST_TAIL (expr);
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if (n && STATEMENT_LIST_HEAD (expr) == n)
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return n->stmt;
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else
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return NULL_TREE;
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}
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if (TREE_CODE (expr) == COMPOUND_EXPR)
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return NULL_TREE;
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return expr;
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}
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#include "gt-tree-iterator.h"
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