89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/* Memory ranges
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Copyright (C) 2010, 2011 Free Software Foundation, Inc.
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This file is part of GDB.
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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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#include "defs.h"
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#include "memrange.h"
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int
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mem_ranges_overlap (CORE_ADDR start1, int len1,
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CORE_ADDR start2, int len2)
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{
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ULONGEST h, l;
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l = max (start1, start2);
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h = min (start1 + len1, start2 + len2);
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return (l < h);
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}
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/* qsort comparison function, that compares mem_ranges. Ranges are
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sorted in ascending START order. */
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static int
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compare_mem_ranges (const void *ap, const void *bp)
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{
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const struct mem_range *r1 = ap;
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const struct mem_range *r2 = bp;
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if (r1->start > r2->start)
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return 1;
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else if (r1->start < r2->start)
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return -1;
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else
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return 0;
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}
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void
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normalize_mem_ranges (VEC(mem_range_s) *ranges)
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{
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/* This function must not use any VEC operation on RANGES that
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reallocates the memory block as that invalidates the RANGES
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pointer, which callers expect to remain valid. */
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if (!VEC_empty (mem_range_s, ranges))
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{
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struct mem_range *ra, *rb;
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int a, b;
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qsort (VEC_address (mem_range_s, ranges),
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VEC_length (mem_range_s, ranges),
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sizeof (mem_range_s),
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compare_mem_ranges);
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a = 0;
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ra = VEC_index (mem_range_s, ranges, a);
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for (b = 1; VEC_iterate (mem_range_s, ranges, b, rb); b++)
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{
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/* If mem_range B overlaps or is adjacent to mem_range A,
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merge them. */
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if (rb->start <= ra->start + ra->length)
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{
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ra->length = max (ra->length,
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(rb->start - ra->start) + rb->length);
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continue; /* next b, same a */
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}
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a++; /* next a */
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ra = VEC_index (mem_range_s, ranges, a);
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if (a != b)
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*ra = *rb;
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}
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VEC_truncate (mem_range_s, ranges, a + 1);
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}
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}
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