Initial revision
This commit is contained in:
Akinori Ito
621
gc/cord/cordxtra.c
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621
gc/cord/cordxtra.c
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@@ -0,0 +1,621 @@
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/*
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* Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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* Author: Hans-J. Boehm (boehm@parc.xerox.com)
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*/
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/*
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* These are functions on cords that do not need to understand their
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* implementation. They serve also serve as example client code for
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* cord_basics.
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*/
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/* Boehm, December 8, 1995 1:53 pm PST */
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# include <stdio.h>
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# include <string.h>
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# include <stdlib.h>
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# include <stdarg.h>
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# include "cord.h"
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# include "ec.h"
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# define I_HIDE_POINTERS /* So we get access to allocation lock. */
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/* We use this for lazy file reading, */
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/* so that we remain independent */
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/* of the threads primitives. */
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# include "gc.h"
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/* For now we assume that pointer reads and writes are atomic, */
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/* i.e. another thread always sees the state before or after */
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/* a write. This might be false on a Motorola M68K with */
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/* pointers that are not 32-bit aligned. But there probably */
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/* aren't too many threads packages running on those. */
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# define ATOMIC_WRITE(x,y) (x) = (y)
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# define ATOMIC_READ(x) (*(x))
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/* The standard says these are in stdio.h, but they aren't always: */
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# ifndef SEEK_SET
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# define SEEK_SET 0
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# endif
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# ifndef SEEK_END
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# define SEEK_END 2
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# endif
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# define BUFSZ 2048 /* Size of stack allocated buffers when */
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/* we want large buffers. */
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typedef void (* oom_fn)(void);
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# define OUT_OF_MEMORY { if (CORD_oom_fn != (oom_fn) 0) (*CORD_oom_fn)(); \
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ABORT("Out of memory\n"); }
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# define ABORT(msg) { fprintf(stderr, "%s\n", msg); abort(); }
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CORD CORD_cat_char(CORD x, char c)
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{
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register char * string;
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if (c == '\0') return(CORD_cat(x, CORD_nul(1)));
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string = GC_MALLOC_ATOMIC(2);
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if (string == 0) OUT_OF_MEMORY;
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string[0] = c;
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string[1] = '\0';
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return(CORD_cat_char_star(x, string, 1));
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}
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CORD CORD_catn(int nargs, ...)
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{
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register CORD result = CORD_EMPTY;
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va_list args;
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register int i;
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va_start(args, nargs);
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for (i = 0; i < nargs; i++) {
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register CORD next = va_arg(args, CORD);
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result = CORD_cat(result, next);
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}
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va_end(args);
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return(result);
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}
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typedef struct {
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size_t len;
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size_t count;
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char * buf;
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} CORD_fill_data;
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int CORD_fill_proc(char c, void * client_data)
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{
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register CORD_fill_data * d = (CORD_fill_data *)client_data;
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register size_t count = d -> count;
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(d -> buf)[count] = c;
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d -> count = ++count;
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if (count >= d -> len) {
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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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}
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int CORD_batched_fill_proc(const char * s, void * client_data)
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{
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register CORD_fill_data * d = (CORD_fill_data *)client_data;
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register size_t count = d -> count;
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register size_t max = d -> len;
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register char * buf = d -> buf;
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register const char * t = s;
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while((buf[count] = *t++) != '\0') {
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count++;
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if (count >= max) {
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d -> count = count;
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return(1);
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}
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}
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d -> count = count;
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return(0);
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}
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/* Fill buf with len characters starting at i. */
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/* Assumes len characters are available. */
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void CORD_fill_buf(CORD x, size_t i, size_t len, char * buf)
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{
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CORD_fill_data fd;
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fd.len = len;
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fd.buf = buf;
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fd.count = 0;
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(void)CORD_iter5(x, i, CORD_fill_proc, CORD_batched_fill_proc, &fd);
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}
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int CORD_cmp(CORD x, CORD y)
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{
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CORD_pos xpos;
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CORD_pos ypos;
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register size_t avail, yavail;
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if (y == CORD_EMPTY) return(x != CORD_EMPTY);
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if (x == CORD_EMPTY) return(-1);
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if (CORD_IS_STRING(y) && CORD_IS_STRING(x)) return(strcmp(x,y));
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CORD_set_pos(xpos, x, 0);
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CORD_set_pos(ypos, y, 0);
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for(;;) {
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if (!CORD_pos_valid(xpos)) {
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if (CORD_pos_valid(ypos)) {
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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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}
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if (!CORD_pos_valid(ypos)) {
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return(1);
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}
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if ((avail = CORD_pos_chars_left(xpos)) <= 0
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|| (yavail = CORD_pos_chars_left(ypos)) <= 0) {
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register char xcurrent = CORD_pos_fetch(xpos);
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register char ycurrent = CORD_pos_fetch(ypos);
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if (xcurrent != ycurrent) return(xcurrent - ycurrent);
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CORD_next(xpos);
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CORD_next(ypos);
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} else {
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/* process as many characters as we can */
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register int result;
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if (avail > yavail) avail = yavail;
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result = strncmp(CORD_pos_cur_char_addr(xpos),
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CORD_pos_cur_char_addr(ypos), avail);
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if (result != 0) return(result);
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CORD_pos_advance(xpos, avail);
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CORD_pos_advance(ypos, avail);
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}
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}
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}
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int CORD_ncmp(CORD x, size_t x_start, CORD y, size_t y_start, size_t len)
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{
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CORD_pos xpos;
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CORD_pos ypos;
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register size_t count;
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register long avail, yavail;
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CORD_set_pos(xpos, x, x_start);
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CORD_set_pos(ypos, y, y_start);
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for(count = 0; count < len;) {
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if (!CORD_pos_valid(xpos)) {
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if (CORD_pos_valid(ypos)) {
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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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}
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if (!CORD_pos_valid(ypos)) {
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return(1);
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}
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if ((avail = CORD_pos_chars_left(xpos)) <= 0
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|| (yavail = CORD_pos_chars_left(ypos)) <= 0) {
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register char xcurrent = CORD_pos_fetch(xpos);
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register char ycurrent = CORD_pos_fetch(ypos);
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if (xcurrent != ycurrent) return(xcurrent - ycurrent);
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CORD_next(xpos);
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CORD_next(ypos);
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count++;
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} else {
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/* process as many characters as we can */
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register int result;
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if (avail > yavail) avail = yavail;
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count += avail;
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if (count > len) avail -= (count - len);
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result = strncmp(CORD_pos_cur_char_addr(xpos),
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CORD_pos_cur_char_addr(ypos), (size_t)avail);
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if (result != 0) return(result);
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CORD_pos_advance(xpos, (size_t)avail);
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CORD_pos_advance(ypos, (size_t)avail);
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}
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}
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return(0);
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}
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char * CORD_to_char_star(CORD x)
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{
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register size_t len = CORD_len(x);
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char * result = GC_MALLOC_ATOMIC(len + 1);
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if (result == 0) OUT_OF_MEMORY;
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CORD_fill_buf(x, 0, len, result);
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result[len] = '\0';
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return(result);
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}
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CORD CORD_from_char_star(const char *s)
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{
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char * result;
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size_t len = strlen(s);
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if (0 == len) return(CORD_EMPTY);
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result = GC_MALLOC_ATOMIC(len + 1);
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if (result == 0) OUT_OF_MEMORY;
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memcpy(result, s, len+1);
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return(result);
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}
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const char * CORD_to_const_char_star(CORD x)
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{
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if (x == 0) return("");
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if (CORD_IS_STRING(x)) return((const char *)x);
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return(CORD_to_char_star(x));
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}
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char CORD_fetch(CORD x, size_t i)
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{
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CORD_pos xpos;
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CORD_set_pos(xpos, x, i);
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if (!CORD_pos_valid(xpos)) ABORT("bad index?");
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return(CORD_pos_fetch(xpos));
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}
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int CORD_put_proc(char c, void * client_data)
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{
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register FILE * f = (FILE *)client_data;
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return(putc(c, f) == EOF);
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}
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int CORD_batched_put_proc(const char * s, void * client_data)
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{
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register FILE * f = (FILE *)client_data;
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return(fputs(s, f) == EOF);
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}
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int CORD_put(CORD x, FILE * f)
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{
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if (CORD_iter5(x, 0, CORD_put_proc, CORD_batched_put_proc, f)) {
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return(EOF);
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} else {
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return(1);
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}
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}
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typedef struct {
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size_t pos; /* Current position in the cord */
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char target; /* Character we're looking for */
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} chr_data;
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int CORD_chr_proc(char c, void * client_data)
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{
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register chr_data * d = (chr_data *)client_data;
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if (c == d -> target) return(1);
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(d -> pos) ++;
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return(0);
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}
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int CORD_rchr_proc(char c, void * client_data)
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{
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register chr_data * d = (chr_data *)client_data;
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if (c == d -> target) return(1);
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(d -> pos) --;
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return(0);
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}
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int CORD_batched_chr_proc(const char *s, void * client_data)
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{
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register chr_data * d = (chr_data *)client_data;
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register char * occ = strchr(s, d -> target);
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if (occ == 0) {
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d -> pos += strlen(s);
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return(0);
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} else {
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d -> pos += occ - s;
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return(1);
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}
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}
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size_t CORD_chr(CORD x, size_t i, int c)
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{
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chr_data d;
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d.pos = i;
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d.target = c;
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if (CORD_iter5(x, i, CORD_chr_proc, CORD_batched_chr_proc, &d)) {
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return(d.pos);
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} else {
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return(CORD_NOT_FOUND);
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}
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}
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size_t CORD_rchr(CORD x, size_t i, int c)
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{
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chr_data d;
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d.pos = i;
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d.target = c;
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if (CORD_riter4(x, i, CORD_rchr_proc, &d)) {
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return(d.pos);
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} else {
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return(CORD_NOT_FOUND);
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}
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}
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/* Find the first occurrence of s in x at position start or later. */
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/* This uses an asymptotically poor algorithm, which should typically */
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/* perform acceptably. We compare the first few characters directly, */
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/* and call CORD_ncmp whenever there is a partial match. */
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/* This has the advantage that we allocate very little, or not at all. */
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/* It's very fast if there are few close misses. */
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size_t CORD_str(CORD x, size_t start, CORD s)
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{
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CORD_pos xpos;
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size_t xlen = CORD_len(x);
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size_t slen;
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register size_t start_len;
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const char * s_start;
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unsigned long s_buf = 0; /* The first few characters of s */
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unsigned long x_buf = 0; /* Start of candidate substring. */
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/* Initialized only to make compilers */
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/* happy. */
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unsigned long mask = 0;
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register size_t i;
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register size_t match_pos;
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if (s == CORD_EMPTY) return(start);
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if (CORD_IS_STRING(s)) {
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s_start = s;
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slen = strlen(s);
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} else {
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s_start = CORD_to_char_star(CORD_substr(s, 0, sizeof(unsigned long)));
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slen = CORD_len(s);
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}
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if (xlen < start || xlen - start < slen) return(CORD_NOT_FOUND);
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start_len = slen;
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if (start_len > sizeof(unsigned long)) start_len = sizeof(unsigned long);
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CORD_set_pos(xpos, x, start);
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for (i = 0; i < start_len; i++) {
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mask <<= 8;
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mask |= 0xff;
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s_buf <<= 8;
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s_buf |= s_start[i];
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x_buf <<= 8;
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x_buf |= CORD_pos_fetch(xpos);
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CORD_next(xpos);
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}
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for (match_pos = start; ; match_pos++) {
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if ((x_buf & mask) == s_buf) {
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if (slen == start_len ||
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CORD_ncmp(x, match_pos + start_len,
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s, start_len, slen - start_len) == 0) {
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return(match_pos);
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}
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}
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if ( match_pos == xlen - slen ) {
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return(CORD_NOT_FOUND);
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}
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x_buf <<= 8;
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x_buf |= CORD_pos_fetch(xpos);
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CORD_next(xpos);
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}
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}
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void CORD_ec_flush_buf(CORD_ec x)
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{
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register size_t len = x[0].ec_bufptr - x[0].ec_buf;
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char * s;
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if (len == 0) return;
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s = GC_MALLOC_ATOMIC(len+1);
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memcpy(s, x[0].ec_buf, len);
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s[len] = '\0';
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x[0].ec_cord = CORD_cat_char_star(x[0].ec_cord, s, len);
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x[0].ec_bufptr = x[0].ec_buf;
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}
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void CORD_ec_append_cord(CORD_ec x, CORD s)
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{
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CORD_ec_flush_buf(x);
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x[0].ec_cord = CORD_cat(x[0].ec_cord, s);
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}
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/*ARGSUSED*/
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char CORD_nul_func(size_t i, void * client_data)
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{
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return((char)(unsigned long)client_data);
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}
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CORD CORD_chars(char c, size_t i)
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{
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return(CORD_from_fn(CORD_nul_func, (void *)(unsigned long)c, i));
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}
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CORD CORD_from_file_eager(FILE * f)
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{
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register int c;
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CORD_ec ecord;
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CORD_ec_init(ecord);
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for(;;) {
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c = getc(f);
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if (c == 0) {
|
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/* Append the right number of NULs */
|
||||
/* Note that any string of NULs is rpresented in 4 words, */
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||||
/* independent of its length. */
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register size_t count = 1;
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CORD_ec_flush_buf(ecord);
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while ((c = getc(f)) == 0) count++;
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ecord[0].ec_cord = CORD_cat(ecord[0].ec_cord, CORD_nul(count));
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}
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if (c == EOF) break;
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CORD_ec_append(ecord, c);
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}
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(void) fclose(f);
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return(CORD_balance(CORD_ec_to_cord(ecord)));
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||||
}
|
||||
|
||||
/* The state maintained for a lazily read file consists primarily */
|
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/* of a large direct-mapped cache of previously read values. */
|
||||
/* We could rely more on stdio buffering. That would have 2 */
|
||||
/* disadvantages: */
|
||||
/* 1) Empirically, not all fseek implementations preserve the */
|
||||
/* buffer whenever they could. */
|
||||
/* 2) It would fail if 2 different sections of a long cord */
|
||||
/* were being read alternately. */
|
||||
/* We do use the stdio buffer for read ahead. */
|
||||
/* To guarantee thread safety in the presence of atomic pointer */
|
||||
/* writes, cache lines are always replaced, and never modified in */
|
||||
/* place. */
|
||||
|
||||
# define LOG_CACHE_SZ 14
|
||||
# define CACHE_SZ (1 << LOG_CACHE_SZ)
|
||||
# define LOG_LINE_SZ 9
|
||||
# define LINE_SZ (1 << LOG_LINE_SZ)
|
||||
|
||||
typedef struct {
|
||||
size_t tag;
|
||||
char data[LINE_SZ];
|
||||
/* data[i%LINE_SZ] = ith char in file if tag = i/LINE_SZ */
|
||||
} cache_line;
|
||||
|
||||
typedef struct {
|
||||
FILE * lf_file;
|
||||
size_t lf_current; /* Current file pointer value */
|
||||
cache_line * volatile lf_cache[CACHE_SZ/LINE_SZ];
|
||||
} lf_state;
|
||||
|
||||
# define MOD_CACHE_SZ(n) ((n) & (CACHE_SZ - 1))
|
||||
# define DIV_CACHE_SZ(n) ((n) >> LOG_CACHE_SZ)
|
||||
# define MOD_LINE_SZ(n) ((n) & (LINE_SZ - 1))
|
||||
# define DIV_LINE_SZ(n) ((n) >> LOG_LINE_SZ)
|
||||
# define LINE_START(n) ((n) & ~(LINE_SZ - 1))
|
||||
|
||||
typedef struct {
|
||||
lf_state * state;
|
||||
size_t file_pos; /* Position of needed character. */
|
||||
cache_line * new_cache;
|
||||
} refill_data;
|
||||
|
||||
/* Executed with allocation lock. */
|
||||
static char refill_cache(client_data)
|
||||
refill_data * client_data;
|
||||
{
|
||||
register lf_state * state = client_data -> state;
|
||||
register size_t file_pos = client_data -> file_pos;
|
||||
FILE *f = state -> lf_file;
|
||||
size_t line_start = LINE_START(file_pos);
|
||||
size_t line_no = DIV_LINE_SZ(MOD_CACHE_SZ(file_pos));
|
||||
cache_line * new_cache = client_data -> new_cache;
|
||||
|
||||
if (line_start != state -> lf_current
|
||||
&& fseek(f, line_start, SEEK_SET) != 0) {
|
||||
ABORT("fseek failed");
|
||||
}
|
||||
if (fread(new_cache -> data, sizeof(char), LINE_SZ, f)
|
||||
<= file_pos - line_start) {
|
||||
ABORT("fread failed");
|
||||
}
|
||||
new_cache -> tag = DIV_LINE_SZ(file_pos);
|
||||
/* Store barrier goes here. */
|
||||
ATOMIC_WRITE(state -> lf_cache[line_no], new_cache);
|
||||
state -> lf_current = line_start + LINE_SZ;
|
||||
return(new_cache->data[MOD_LINE_SZ(file_pos)]);
|
||||
}
|
||||
|
||||
char CORD_lf_func(size_t i, void * client_data)
|
||||
{
|
||||
register lf_state * state = (lf_state *)client_data;
|
||||
register cache_line * volatile * cl_addr =
|
||||
&(state -> lf_cache[DIV_LINE_SZ(MOD_CACHE_SZ(i))]);
|
||||
register cache_line * cl = (cache_line *)ATOMIC_READ(cl_addr);
|
||||
|
||||
if (cl == 0 || cl -> tag != DIV_LINE_SZ(i)) {
|
||||
/* Cache miss */
|
||||
refill_data rd;
|
||||
|
||||
rd.state = state;
|
||||
rd.file_pos = i;
|
||||
rd.new_cache = GC_NEW_ATOMIC(cache_line);
|
||||
if (rd.new_cache == 0) OUT_OF_MEMORY;
|
||||
return((char)(GC_word)
|
||||
GC_call_with_alloc_lock((GC_fn_type) refill_cache, &rd));
|
||||
}
|
||||
return(cl -> data[MOD_LINE_SZ(i)]);
|
||||
}
|
||||
|
||||
/*ARGSUSED*/
|
||||
void CORD_lf_close_proc(void * obj, void * client_data)
|
||||
{
|
||||
if (fclose(((lf_state *)obj) -> lf_file) != 0) {
|
||||
ABORT("CORD_lf_close_proc: fclose failed");
|
||||
}
|
||||
}
|
||||
|
||||
CORD CORD_from_file_lazy_inner(FILE * f, size_t len)
|
||||
{
|
||||
register lf_state * state = GC_NEW(lf_state);
|
||||
register int i;
|
||||
|
||||
if (state == 0) OUT_OF_MEMORY;
|
||||
if (len != 0) {
|
||||
/* Dummy read to force buffer allocation. */
|
||||
/* This greatly increases the probability */
|
||||
/* of avoiding deadlock if buffer allocation */
|
||||
/* is redirected to GC_malloc and the */
|
||||
/* world is multithreaded. */
|
||||
char buf[1];
|
||||
|
||||
(void) fread(buf, 1, 1, f);
|
||||
rewind(f);
|
||||
}
|
||||
state -> lf_file = f;
|
||||
for (i = 0; i < CACHE_SZ/LINE_SZ; i++) {
|
||||
state -> lf_cache[i] = 0;
|
||||
}
|
||||
state -> lf_current = 0;
|
||||
GC_REGISTER_FINALIZER(state, CORD_lf_close_proc, 0, 0, 0);
|
||||
return(CORD_from_fn(CORD_lf_func, state, len));
|
||||
}
|
||||
|
||||
CORD CORD_from_file_lazy(FILE * f)
|
||||
{
|
||||
register long len;
|
||||
|
||||
if (fseek(f, 0l, SEEK_END) != 0) {
|
||||
ABORT("Bad fd argument - fseek failed");
|
||||
}
|
||||
if ((len = ftell(f)) < 0) {
|
||||
ABORT("Bad fd argument - ftell failed");
|
||||
}
|
||||
rewind(f);
|
||||
return(CORD_from_file_lazy_inner(f, (size_t)len));
|
||||
}
|
||||
|
||||
# define LAZY_THRESHOLD (128*1024 + 1)
|
||||
|
||||
CORD CORD_from_file(FILE * f)
|
||||
{
|
||||
register long len;
|
||||
|
||||
if (fseek(f, 0l, SEEK_END) != 0) {
|
||||
ABORT("Bad fd argument - fseek failed");
|
||||
}
|
||||
if ((len = ftell(f)) < 0) {
|
||||
ABORT("Bad fd argument - ftell failed");
|
||||
}
|
||||
rewind(f);
|
||||
if (len < LAZY_THRESHOLD) {
|
||||
return(CORD_from_file_eager(f));
|
||||
} else {
|
||||
return(CORD_from_file_lazy_inner(f, (size_t)len));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user