fe501957c0
Concentrate compiler dependencies to compiler.h; make sure compiler.h is included first in every .c file (since some prototypes may depend on the presence of feature request macros.) Actually use the conditional inclusion of various functions (totally broken in previous releases.)
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* sync.c the Netwide Disassembler synchronisation processing module
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*
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* The Netwide Assembler is copyright (C) 1996 Simon Tatham and
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* Julian Hall. All rights reserved. The software is
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* redistributable under the licence given in the file "Licence"
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* distributed in the NASM archive.
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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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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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struct Sync t;
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t = synx[i / 2]; /* structure copy */
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synx[i / 2] = synx[i]; /* structure copy again */
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synx[i] = t; /* another structure copy */
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}
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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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struct Sync t;
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t = synx[nsynx]; /* structure copy */
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synx[nsynx] = synx[1]; /* structure copy */
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synx[1] = t; /* ditto */
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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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t = synx[j]; /* structure copy */
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synx[j] = synx[i]; /* lots of these... */
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synx[i] = t; /* ...aren't there? */
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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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t = synx[j + 1]; /* structure copy */
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synx[j + 1] = synx[i]; /* structure <yawn> copy */
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synx[i] = t; /* structure copy <zzzz....> */
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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 UINT32_MAX;
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}
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}
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