305 lines
7.1 KiB
C
305 lines
7.1 KiB
C
/* Address ranges.
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Copyright (C) 1998, 2007 Free Software Foundation, Inc.
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Contributed by Cygnus Solutions.
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This file is part of the GNU Simulators.
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This program 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 3 of the License, or
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(at your option) any later version.
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This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Tell sim-arange.h it's us. */
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#define SIM_ARANGE_C
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#include "libiberty.h"
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#include "sim-basics.h"
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#include "sim-assert.h"
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#define DEFINE_INLINE_P (! defined (SIM_ARANGE_C_INCLUDED))
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#define DEFINE_NON_INLINE_P defined (SIM_ARANGE_C_INCLUDED)
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#if DEFINE_NON_INLINE_P
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/* Insert a range. */
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static void
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insert_range (ADDR_SUBRANGE **pos, ADDR_SUBRANGE *asr)
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{
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asr->next = *pos;
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*pos = asr;
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}
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/* Delete a range. */
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static void
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delete_range (ADDR_SUBRANGE **thisasrp)
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{
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ADDR_SUBRANGE *thisasr;
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thisasr = *thisasrp;
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*thisasrp = thisasr->next;
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free (thisasr);
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}
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/* Add or delete an address range.
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This code was borrowed from linux's locks.c:posix_lock_file().
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??? Todo: Given our simpler needs this could be simplified
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(split into two fns). */
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static void
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frob_range (ADDR_RANGE *ar, address_word start, address_word end, int delete_p)
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{
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ADDR_SUBRANGE *asr;
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ADDR_SUBRANGE *new_asr, *new_asr2;
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ADDR_SUBRANGE *left = NULL;
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ADDR_SUBRANGE *right = NULL;
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ADDR_SUBRANGE **before;
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ADDR_SUBRANGE init_caller;
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ADDR_SUBRANGE *caller = &init_caller;
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int added_p = 0;
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memset (caller, 0, sizeof (ADDR_SUBRANGE));
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new_asr = ZALLOC (ADDR_SUBRANGE);
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new_asr2 = ZALLOC (ADDR_SUBRANGE);
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caller->start = start;
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caller->end = end;
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before = &ar->ranges;
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while ((asr = *before) != NULL)
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{
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if (! delete_p)
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{
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/* Try next range if current range preceeds new one and not
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adjacent or overlapping. */
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if (asr->end < caller->start - 1)
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goto next_range;
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/* Break out if new range preceeds current one and not
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adjacent or overlapping. */
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if (asr->start > caller->end + 1)
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break;
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/* If we come here, the new and current ranges are adjacent or
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overlapping. Make one range yielding from the lower start address
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of both ranges to the higher end address. */
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if (asr->start > caller->start)
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asr->start = caller->start;
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else
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caller->start = asr->start;
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if (asr->end < caller->end)
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asr->end = caller->end;
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else
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caller->end = asr->end;
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if (added_p)
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{
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delete_range (before);
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continue;
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}
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caller = asr;
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added_p = 1;
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}
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else /* deleting a range */
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{
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/* Try next range if current range preceeds new one. */
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if (asr->end < caller->start)
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goto next_range;
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/* Break out if new range preceeds current one. */
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if (asr->start > caller->end)
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break;
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added_p = 1;
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if (asr->start < caller->start)
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left = asr;
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/* If the next range in the list has a higher end
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address than the new one, insert the new one here. */
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if (asr->end > caller->end)
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{
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right = asr;
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break;
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}
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if (asr->start >= caller->start)
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{
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/* The new range completely replaces an old
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one (This may happen several times). */
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if (added_p)
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{
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delete_range (before);
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continue;
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}
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/* Replace the old range with the new one. */
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asr->start = caller->start;
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asr->end = caller->end;
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caller = asr;
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added_p = 1;
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}
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}
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/* Go on to next range. */
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next_range:
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before = &asr->next;
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}
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if (!added_p)
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{
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if (delete_p)
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goto out;
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new_asr->start = caller->start;
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new_asr->end = caller->end;
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insert_range (before, new_asr);
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new_asr = NULL;
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}
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if (right)
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{
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if (left == right)
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{
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/* The new range breaks the old one in two pieces,
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so we have to use the second new range. */
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new_asr2->start = right->start;
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new_asr2->end = right->end;
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left = new_asr2;
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insert_range (before, left);
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new_asr2 = NULL;
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}
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right->start = caller->end + 1;
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}
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if (left)
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{
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left->end = caller->start - 1;
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}
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out:
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if (new_asr)
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free(new_asr);
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if (new_asr2)
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free(new_asr2);
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}
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/* Free T and all subtrees. */
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static void
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free_search_tree (ADDR_RANGE_TREE *t)
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{
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if (t != NULL)
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{
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free_search_tree (t->lower);
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free_search_tree (t->higher);
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free (t);
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}
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}
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/* Subroutine of build_search_tree to recursively build a balanced tree.
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??? It's not an optimum tree though. */
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static ADDR_RANGE_TREE *
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build_tree_1 (ADDR_SUBRANGE **asrtab, unsigned int n)
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{
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unsigned int mid = n / 2;
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ADDR_RANGE_TREE *t;
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if (n == 0)
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return NULL;
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t = (ADDR_RANGE_TREE *) xmalloc (sizeof (ADDR_RANGE_TREE));
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t->start = asrtab[mid]->start;
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t->end = asrtab[mid]->end;
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if (mid != 0)
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t->lower = build_tree_1 (asrtab, mid);
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else
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t->lower = NULL;
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if (n > mid + 1)
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t->higher = build_tree_1 (asrtab + mid + 1, n - mid - 1);
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else
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t->higher = NULL;
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return t;
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}
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/* Build a search tree for address range AR. */
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static void
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build_search_tree (ADDR_RANGE *ar)
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{
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/* ??? Simple version for now. */
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ADDR_SUBRANGE *asr,**asrtab;
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unsigned int i, n;
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for (n = 0, asr = ar->ranges; asr != NULL; ++n, asr = asr->next)
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continue;
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asrtab = (ADDR_SUBRANGE **) xmalloc (n * sizeof (ADDR_SUBRANGE *));
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for (i = 0, asr = ar->ranges; i < n; ++i, asr = asr->next)
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asrtab[i] = asr;
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ar->range_tree = build_tree_1 (asrtab, n);
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free (asrtab);
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}
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void
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sim_addr_range_add (ADDR_RANGE *ar, address_word start, address_word end)
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{
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frob_range (ar, start, end, 0);
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/* Rebuild the search tree. */
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/* ??? Instead of rebuilding it here it could be done in a module resume
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handler, say by first checking for a `changed' flag, assuming of course
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this would never be done while the simulation is running. */
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free_search_tree (ar->range_tree);
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build_search_tree (ar);
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}
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void
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sim_addr_range_delete (ADDR_RANGE *ar, address_word start, address_word end)
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{
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frob_range (ar, start, end, 1);
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/* Rebuild the search tree. */
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/* ??? Instead of rebuilding it here it could be done in a module resume
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handler, say by first checking for a `changed' flag, assuming of course
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this would never be done while the simulation is running. */
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free_search_tree (ar->range_tree);
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build_search_tree (ar);
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}
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#endif /* DEFINE_NON_INLINE_P */
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#if DEFINE_INLINE_P
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SIM_ARANGE_INLINE int
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sim_addr_range_hit_p (ADDR_RANGE *ar, address_word addr)
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{
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ADDR_RANGE_TREE *t = ar->range_tree;
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while (t != NULL)
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{
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if (addr < t->start)
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t = t->lower;
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else if (addr > t->end)
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t = t->higher;
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else
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return 1;
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}
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return 0;
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}
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#endif /* DEFINE_INLINE_P */
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