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127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 1996-2009 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* sync.c the Netwide Disassembler synchronisation processing module
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*/
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#include "compiler.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <inttypes.h>
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#include "nasmlib.h"
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#include "sync.h"
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#define SYNC_MAX 4096 /* max # of sync points (initial) */
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/*
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* This lot manages the current set of sync points by means of a
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* heap (priority queue) structure.
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*/
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static struct Sync {
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uint32_t pos;
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uint32_t length;
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} *synx;
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static int max_synx, nsynx;
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static inline void swap_sync(uint32_t dst, uint32_t src)
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{
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struct Sync t = synx[dst];
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synx[dst] = synx[src];
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synx[src] = t;
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}
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void init_sync(void)
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{
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max_synx = SYNC_MAX-1;
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synx = nasm_malloc(SYNC_MAX * sizeof(*synx));
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nsynx = 0;
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}
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void add_sync(uint32_t pos, uint32_t length)
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{
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int i;
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if (nsynx >= max_synx) {
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max_synx = (max_synx << 1)+1;
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synx = nasm_realloc(synx, (max_synx+1) * sizeof(*synx));
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}
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nsynx++;
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synx[nsynx].pos = pos;
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synx[nsynx].length = length;
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for (i = nsynx; i > 1; i /= 2) {
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if (synx[i / 2].pos > synx[i].pos)
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swap_sync(i / 2, i);
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}
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}
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uint32_t next_sync(uint32_t position, uint32_t *length)
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{
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while (nsynx > 0 && synx[1].pos + synx[1].length <= position) {
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int i, j;
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swap_sync(nsynx, 1);
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nsynx--;
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i = 1;
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while (i * 2 <= nsynx) {
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j = i * 2;
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if (synx[j].pos < synx[i].pos &&
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(j + 1 > nsynx || synx[j + 1].pos > synx[j].pos)) {
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swap_sync(j, i);
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i = j;
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} else if (j + 1 <= nsynx && synx[j + 1].pos < synx[i].pos) {
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swap_sync(j + 1, i);
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i = j + 1;
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} else
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break;
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}
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}
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if (nsynx > 0) {
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if (length)
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*length = synx[1].length;
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return synx[1].pos;
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} else {
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if (length)
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*length = 0L;
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return 0;
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}
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}
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