listing.c

开源的nasm编译器源码,研究编译器原理很有帮且

/* listing.c    listing file generator for the Netwide Assembler
 *
 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
 * Julian Hall. All rights reserved. The software is
 * redistributable under the licence given in the file "Licence"
 * distributed in the NASM archive.
 *
 * initial version 2/vii/97 by Simon Tatham
 */

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <ctype.h>

#include "nasm.h"
#include "nasmlib.h"
#include "listing.h"

#define LIST_MAX_LEN 216	       /* something sensible */
#define LIST_INDENT  40
#define LIST_HEXBIT  18

typedef struct MacroInhibit MacroInhibit;

static struct MacroInhibit {
    MacroInhibit *next;
    int level;
    int inhibiting;
} *mistack;

static char xdigit[] = "0123456789ABCDEF";

#define HEX(a,b) (*(a)=xdigit[((b)>>4)&15],(a)[1]=xdigit[(b)&15]);

static char listline[LIST_MAX_LEN];
static int listlinep;

static char listdata[2*LIST_INDENT];   /* we need less than that actually */
static long listoffset;

static long listlineno;

static long listp;

static int suppress;		       /* for INCBIN & TIMES special cases */

static int listlevel, listlevel_e;

static FILE *listfp;

static void list_emit (void) 
{
    if (!listlinep && !listdata[0])
	return;

    fprintf(listfp, "%6ld ", ++listlineno);

    if (listdata[0])
	fprintf(listfp, "%08lX %-*s", listoffset, LIST_HEXBIT+1, listdata);
    else
	fprintf(listfp, "%*s", LIST_HEXBIT+10, "");

    if (listlevel_e)
	fprintf(listfp, "%s<%d>", (listlevel < 10 ? " " : ""), listlevel_e);
    else if (listlinep)
	fprintf(listfp, "    ");

    if (listlinep)
	fprintf(listfp, " %s", listline);

    fputc('\n', listfp);
    listlinep = FALSE;
    listdata[0] = '\0';
}

static void list_init (char *fname, efunc error) 
{
    listfp = fopen (fname, "w");
    if (!listfp) {
	error (ERR_NONFATAL, "unable to open listing file `%s'", fname);
	return;
    }

    *listline = '\0';
    listlineno = 0;
    listp = TRUE;
    listlevel = 0;
    suppress = 0;
    mistack = nasm_malloc(sizeof(MacroInhibit));
    mistack->next = NULL;
    mistack->level = 0;
    mistack->inhibiting = TRUE;
}

static void list_cleanup (void) 
{
    if (!listp)
	return;

    while (mistack) {
	MacroInhibit *temp = mistack;
	mistack = temp->next;
	nasm_free (temp);
    }

    list_emit();
    fclose (listfp);
}

static void list_out (long offset, char *str) 
{
    if (strlen(listdata) + strlen(str) > LIST_HEXBIT) {
	strcat(listdata, "-");
	list_emit();
    }
    if (!listdata[0])
	listoffset = offset;
    strcat(listdata, str);
}

static void list_output (long offset, const void *data, unsigned long type) 
{
    unsigned long typ, size;

    if (!listp || suppress || user_nolist)    /* fbk - 9/2/00 */
	return;

    typ = type & OUT_TYPMASK;
    size = type & OUT_SIZMASK;

    if (typ == OUT_RAWDATA) 
    {
	unsigned char const *p = data;
	char q[3];
	while (size--) 
	{
	    HEX (q, *p);
	    q[2] = '\0';
	    list_out (offset++, q);
	    p++;
	}
    } 
    else if (typ == OUT_ADDRESS) 
    {
	unsigned long d = *(long *)data;
	char q[11];
	unsigned char p[4], *r = p;
	if (size == 4) 
	{
	    q[0] = '['; q[9] = ']'; q[10] = '\0';
	    WRITELONG (r, d);
	    HEX (q+1, p[0]);
	    HEX (q+3, p[1]);
	    HEX (q+5, p[2]);
	    HEX (q+7, p[3]);
	    list_out (offset, q);
	} 
	else {
	    q[0] = '['; q[5] = ']'; q[6] = '\0';
	    WRITESHORT (r, d);
	    HEX (q+1, p[0]);
	    HEX (q+3, p[1]);
	    list_out (offset, q);
	}
    } 
    else if (typ == OUT_REL2ADR) 
    {
	unsigned long d = *(long *)data;
	char q[11];
	unsigned char p[4], *r = p;
	q[0] = '('; q[5] = ')'; q[6] = '\0';
	WRITESHORT (r, d);
	HEX (q+1, p[0]);
	HEX (q+3, p[1]);
	list_out (offset, q);
    } 
    else if (typ == OUT_REL4ADR) 
    {
	unsigned long d = *(long *)data;
	char q[11];
	unsigned char p[4], *r = p;
	q[0] = '('; q[9] = ')'; q[10] = '\0';
	WRITELONG (r, d);
	HEX (q+1, p[0]);
	HEX (q+3, p[1]);
	HEX (q+5, p[2]);
	HEX (q+7, p[3]);
	list_out (offset, q);
    } 
    else if (typ == OUT_RESERVE) 
    {
	char q[20];
	sprintf(q, "<res %08lX>", size);
	list_out (offset, q);
    }
}

static void list_line (int type, char *line) 
{
    if (!listp)
	return;
    if (user_nolist){        /* fbk - 9/2/00 */
        listlineno++;
        return;
    }

    if (mistack && mistack->inhibiting) 
    {
	if (type == LIST_MACRO)
	    return;
	else {			       /* pop the m i stack */
	    MacroInhibit *temp = mistack;
	    mistack = temp->next;
	    nasm_free (temp);
	}
    }
    list_emit();
    listlinep = TRUE;
    strncpy (listline, line, LIST_MAX_LEN-1);
    listline[LIST_MAX_LEN-1] = '\0';
    listlevel_e = listlevel;
}

static void list_uplevel (int type) 
{
    if (!listp)
	return;
    if (type == LIST_INCBIN || type == LIST_TIMES) 
    {
	suppress |= (type == LIST_INCBIN ? 1 : 2);
	list_out (listoffset, type == LIST_INCBIN ? "<incbin>" : "<rept>");
	return;
    }

    listlevel++;

    if (mistack && mistack->inhibiting && type == LIST_INCLUDE) 
    {
	MacroInhibit *temp = nasm_malloc(sizeof(MacroInhibit));
	temp->next = mistack;
	temp->level = listlevel;
	temp->inhibiting = FALSE;
	mistack = temp;
    } 
    else if (type == LIST_MACRO_NOLIST) 
    {
	MacroInhibit *temp = nasm_malloc(sizeof(MacroInhibit));
	temp->next = mistack;
	temp->level = listlevel;
	temp->inhibiting = TRUE;
	mistack = temp;
    }
}

static void list_downlevel (int type) 
{
    if (!listp)
	return;

    if (type == LIST_INCBIN || type == LIST_TIMES) 
    {
	suppress &= ~(type == LIST_INCBIN ? 1 : 2);
	return;
    }

    listlevel--;
    while (mistack && mistack->level > listlevel) 
    {
	MacroInhibit *temp = mistack;
	mistack = temp->next;
	nasm_free (temp);
    }
}

ListGen nasmlist = {
    list_init,
    list_cleanup,
    list_output,
    list_line,
    list_uplevel,
    list_downlevel
};