cordxtra.c

linux下建立JAVA虚拟机的源码KAFFE

/*
 * Copyright (c) 1993-1994 by Xerox Corporation.  All rights reserved.
 *
 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
 *
 * Permission is hereby granted to use or copy this program
 * for any purpose,  provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 *
 * Author: Hans-J. Boehm ([e-mail])
 */
/*
 * These are functions on cords that do not need to understand their
 * implementation.  They serve also serve as example client code for
 * cord_basics.
 */
/* Boehm, December 8, 1995 1:53 pm PST */
# include <stdio.h>
# include <string.h>
# include <stdlib.h>
# include <stdarg.h>
# include "cord.h"
# include "ec.h"
# define I_HIDE_POINTERS	/* So we get access to allocation lock.	*/
				/* We use this for lazy file reading, 	*/
				/* so that we remain independent 	*/
				/* of the threads primitives.		*/
# include "gc.h"

/* For now we assume that pointer reads and writes are atomic, 	*/
/* i.e. another thread always sees the state before or after	*/
/* a write.  This might be false on a Motorola M68K with	*/
/* pointers that are not 32-bit aligned.  But there probably	*/
/* aren't too many threads packages running on those.		*/
# define ATOMIC_WRITE(x,y) (x) = (y)
# define ATOMIC_READ(x) (*(x))

/* The standard says these are in stdio.h, but they aren't always: */
# ifndef SEEK_SET
#   define SEEK_SET 0
# endif
# ifndef SEEK_END
#   define SEEK_END 2
# endif

# define BUFSZ 2048	/* Size of stack allocated buffers when		*/
			/* we want large buffers.			*/

typedef void (* oom_fn)(void);

# define OUT_OF_MEMORY {  if (CORD_oom_fn != (oom_fn) 0) (*CORD_oom_fn)(); \
			  ABORT("Out of memory\n"); }
# define ABORT(msg) { fprintf(stderr, "%s\n", msg); abort(); }

CORD CORD_cat_char(CORD x, char c)
{
    register char * string;
    
    if (c == '\0') return(CORD_cat(x, CORD_nul(1)));
    string = GC_MALLOC_ATOMIC(2);
    if (string == 0) OUT_OF_MEMORY;
    string[0] = c;
    string[1] = '\0';
    return(CORD_cat_char_star(x, string, 1));
}

CORD CORD_catn(int nargs, ...)
{
    register CORD result = CORD_EMPTY;
    va_list args;
    register int i;

    va_start(args, nargs);
    for (i = 0; i < nargs; i++) {
        register CORD next = va_arg(args, CORD);
        result = CORD_cat(result, next);
    }
    va_end(args);
    return(result);
}

typedef struct {
	size_t len;
	size_t count;
	char * buf;
} CORD_fill_data;

int CORD_fill_proc(char c, void * client_data)
{
    register CORD_fill_data * d = (CORD_fill_data *)client_data;
    register size_t count = d -> count;
    
    (d -> buf)[count] = c;
    d -> count = ++count;
    if (count >= d -> len) {
    	return(1);
    } else {
    	return(0);
    }
}

int CORD_batched_fill_proc(const char * s, void * client_data)
{
    register CORD_fill_data * d = (CORD_fill_data *)client_data;
    register size_t count = d -> count;
    register size_t max = d -> len;
    register char * buf = d -> buf;
    register const char * t = s;
    
    while((buf[count] = *t++) != '\0') {
        count++;
        if (count >= max) {
            d -> count = count;
            return(1);
        }
    }
    d -> count = count;
    return(0);
}

/* Fill buf with len characters starting at i.  			*/
/* Assumes len characters are available.				*/ 
void CORD_fill_buf(CORD x, size_t i, size_t len, char * buf)
{
    CORD_fill_data fd;
    
    fd.len = len;
    fd.buf = buf;
    fd.count = 0;
    (void)CORD_iter5(x, i, CORD_fill_proc, CORD_batched_fill_proc, &fd);
}

int CORD_cmp(CORD x, CORD y)
{
    CORD_pos xpos;
    CORD_pos ypos;
    register size_t avail, yavail;
    
    if (y == CORD_EMPTY) return(x != CORD_EMPTY);
    if (x == CORD_EMPTY) return(-1);
    if (CORD_IS_STRING(y) && CORD_IS_STRING(x)) return(strcmp(x,y));
    CORD_set_pos(xpos, x, 0);
    CORD_set_pos(ypos, y, 0);
    for(;;) {
        if (!CORD_pos_valid(xpos)) {
            if (CORD_pos_valid(ypos)) {
            	return(-1);
            } else {
                return(0);
            }
        }
        if (!CORD_pos_valid(ypos)) {
            return(1);
        }
        if ((avail = CORD_pos_chars_left(xpos)) <= 0
            || (yavail = CORD_pos_chars_left(ypos)) <= 0) {
            register char xcurrent = CORD_pos_fetch(xpos);
            register char ycurrent = CORD_pos_fetch(ypos);
            if (xcurrent != ycurrent) return(xcurrent - ycurrent);
            CORD_next(xpos);
            CORD_next(ypos);
        } else {
            /* process as many characters as we can	*/
            register int result;
            
            if (avail > yavail) avail = yavail;
            result = strncmp(CORD_pos_cur_char_addr(xpos),
            		     CORD_pos_cur_char_addr(ypos), avail);
            if (result != 0) return(result);
            CORD_pos_advance(xpos, avail);
            CORD_pos_advance(ypos, avail);
        }
    }
}

int CORD_ncmp(CORD x, size_t x_start, CORD y, size_t y_start, size_t len)
{
    CORD_pos xpos;
    CORD_pos ypos;
    register size_t count;
    register long avail, yavail;
    
    CORD_set_pos(xpos, x, x_start);
    CORD_set_pos(ypos, y, y_start);
    for(count = 0; count < len;) {
        if (!CORD_pos_valid(xpos)) {
            if (CORD_pos_valid(ypos)) {
            	return(-1);
            } else {
                return(0);
            }
        }
        if (!CORD_pos_valid(ypos)) {
            return(1);
        }
        if ((avail = CORD_pos_chars_left(xpos)) <= 0
            || (yavail = CORD_pos_chars_left(ypos)) <= 0) {
            register char xcurrent = CORD_pos_fetch(xpos);
            register char ycurrent = CORD_pos_fetch(ypos);
            if (xcurrent != ycurrent) return(xcurrent - ycurrent);
            CORD_next(xpos);
            CORD_next(ypos);
            count++;
        } else {
            /* process as many characters as we can	*/
            register int result;
            
            if (avail > yavail) avail = yavail;
            count += avail;
            if (count > len) avail -= (count - len);
            result = strncmp(CORD_pos_cur_char_addr(xpos),
            		     CORD_pos_cur_char_addr(ypos), (size_t)avail);
            if (result != 0) return(result);
            CORD_pos_advance(xpos, (size_t)avail);
            CORD_pos_advance(ypos, (size_t)avail);
        }
    }
    return(0);
}

char * CORD_to_char_star(CORD x)
{
    register size_t len = CORD_len(x);
    char * result = GC_MALLOC_ATOMIC(len + 1);
    
    if (result == 0) OUT_OF_MEMORY;
    CORD_fill_buf(x, 0, len, result);
    result[len] = '\0';
    return(result);
}

CORD CORD_from_char_star(const char *s)
{
    char * result;
    size_t len = strlen(s);

    if (0 == len) return(CORD_EMPTY);
    result = GC_MALLOC_ATOMIC(len + 1);
    if (result == 0) OUT_OF_MEMORY;
    memcpy(result, s, len+1);
    return(result);
}

const char * CORD_to_const_char_star(CORD x)
{
    if (x == 0) return("");
    if (CORD_IS_STRING(x)) return((const char *)x);
    return(CORD_to_char_star(x));
}

char CORD_fetch(CORD x, size_t i)
{
    CORD_pos xpos;
    
    CORD_set_pos(xpos, x, i);
    if (!CORD_pos_valid(xpos)) ABORT("bad index?");
    return(CORD_pos_fetch(xpos));
}


int CORD_put_proc(char c, void * client_data)
{
    register FILE * f = (FILE *)client_data;
    
    return(putc(c, f) == EOF);
}

int CORD_batched_put_proc(const char * s, void * client_data)
{
    register FILE * f = (FILE *)client_data;
    
    return(fputs(s, f) == EOF);
}
    

int CORD_put(CORD x, FILE * f)
{
    if (CORD_iter5(x, 0, CORD_put_proc, CORD_batched_put_proc, f)) {
        return(EOF);
    } else {
    	return(1);
    }
}

typedef struct {
    size_t pos;		/* Current position in the cord */
    char target;	/* Character we're looking for	*/
} chr_data;

int CORD_chr_proc(char c, void * client_data)
{
    register chr_data * d = (chr_data *)client_data;
    
    if (c == d -> target) return(1);
    (d -> pos) ++;
    return(0);
}

int CORD_rchr_proc(char c, void * client_data)
{
    register chr_data * d = (chr_data *)client_data;
    
    if (c == d -> target) return(1);
    (d -> pos) --;
    return(0);
}

int CORD_batched_chr_proc(const char *s, void * client_data)