318 lines
6.3 KiB
C
318 lines
6.3 KiB
C
/* $Id$ */
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/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* I N T E R M E D I A T E C O D E
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*
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* I C _ L I B . C
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*/
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#include <stdio.h>
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#include <em_spec.h>
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#include <em_pseu.h>
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#include <em_mes.h>
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#include <arch.h>
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#include "../share/types.h"
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#include "../share/debug.h"
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#include "ic.h"
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#include "ic_lookup.h"
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#include "ic_io.h"
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#include "../share/global.h"
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#include "../share/files.h"
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#include "ic_lib.h"
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STATIC skip_string(n)
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offset n;
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{
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/* Read a string of length n and void it */
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while (n--)
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{
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readchar();
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}
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}
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STATIC void skip_arguments()
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{
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/* Skip the arguments of a MES pseudo. The argument
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* list is terminated by a sp_cend byte.
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*/
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for (;;)
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{
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switch (table2())
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{
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case sp_scon:
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get_off(); /* void */
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/* fall through !!! */
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case sp_icon:
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case sp_ucon:
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case sp_fcon:
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get_int(); /* void */
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skip_string(get_off());
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break;
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case sp_cend:
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return;
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default:
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break;
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}
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}
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}
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STATIC bool proc_wanted(name) char* name;
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{
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/* See if 'name' is the name of an external procedure
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* that has been used before, but for which no body
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* has been given so far.
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*/
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proc_p p;
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if ((p = proclookup(name, IMPORTING)) != (proc_p)0 && !(p->p_flags1 & PF_BODYSEEN))
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{
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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STATIC bool data_wanted(name) char* name;
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{
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/* See if 'name' is the name of an externally visible
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* data block that has been used before, but for which
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* no defining occurrence has been given yet.
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*/
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dblock_p db;
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if ((db = symlookup(name, IMPORTING)) != (dblock_p)0 && db->d_pseudo == DUNKNOWN)
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{
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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STATIC bool wanted_names()
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{
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/* Read the names of procedures and data labels,
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* appearing in a 'MES ms_ext' pseudo. Those are
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* the names of entities that are imported by
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* a library module.
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* If any of them is wanted, return TRUE.
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* A name is wanted if it is the name of a procedure
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* or data block for which applied occurrences but
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* no defining occurrence has been met.
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*/
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for (;;)
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{
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switch (table2())
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{
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case DLBX:
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if (data_wanted(string))
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{
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return TRUE;
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}
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/* A data entity with the name
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* string is available.
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*/
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break;
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case sp_pnam:
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if (proc_wanted(string))
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{
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return TRUE;
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}
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break;
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case sp_cend:
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return FALSE;
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default:
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error("wrong argument of MES %d", ms_ext);
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}
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}
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}
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STATIC FILE* curfile = NULL;
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STATIC bool useful()
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{
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/* Determine if any entity imported by the current
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* compact EM assembly file (which will usually be
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* part of an archive file) is useful to us.
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* The file must contain (before any other non-MES line)
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* a 'MES ms_ext' pseudo that has as arguments the names
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* of the entities imported.
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*/
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for (;;)
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{
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if (table1() != PSEU || tabval != ps_mes)
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{
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error("cannot find MES %d in library file", ms_ext);
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}
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if (table2() != CSTX1)
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{
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error("message number expected");
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}
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if (tabval == ms_ext)
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{
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/* This is the one we searched */
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return wanted_names();
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/* Read the names of the imported entities
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* and check if any of them is wanted.
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*/
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}
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else
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{
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skip_arguments(); /* skip remainder of this MES */
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}
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}
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}
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STATIC bool is_archive(name) char* name;
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{
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/* See if 'name' is the name of an archive file, i.e. it
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* should end on ".ma" and should at least be four characters
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* long (i.e. the name ".ma" is not accepted as an archive name!).
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*/
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register char* p;
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for (p = name; *p; p++)
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;
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return (p > name + 3) && (*--p == 'a') && (*--p == 'm') && (*--p == '.');
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}
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STATIC struct ar_hdr hdr;
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STATIC bool read_hdr()
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{
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/* Read the header of an archive module */
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char buf[AR_TOTAL];
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register char* c = buf;
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register char* p = hdr.ar_name;
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register int i;
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fread(c, AR_TOTAL, 1, curfile);
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if (feof(curfile))
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return 0;
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i = 14;
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while (i--)
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{
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*p++ = *c++;
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}
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#define get2(c) (((c)[0] & 0377) | ((unsigned)((c)[1] & 0377) << 8))
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hdr.ar_date = ((long)get2(c)) << 16;
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c += 2;
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hdr.ar_date |= ((long)get2(c)) & 0xffff;
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c += 2;
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hdr.ar_uid = *c++;
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hdr.ar_gid = *c++;
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hdr.ar_mode = get2(c);
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c += 2;
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hdr.ar_size = (long)get2(c) << 16;
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c += 2;
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hdr.ar_size |= (long)get2(c) & 0xffff;
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return 1;
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}
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STATIC int argcnt = 0;
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STATIC short arstate = NO_ARCHIVE;
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FILE* next_file(argc, argv) int argc;
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char* argv[];
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{
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/* See if there are more EM input files. The file names
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* are given via argv. If a file is an archive file
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* it is supposed to be a library of EM compact assembly
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* files. A module (file) contained in this archive file
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* is only used if it imports at least one procedure or
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* datalabel for which we have not yet seen a defining
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* occurrence, although we have seen a used occurrence.
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*/
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long ptr;
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for (;;)
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{
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/* This loop is only exited via a return */
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if (arstate == ARCHIVE)
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{
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/* We were reading an archive file */
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if (ftell(curfile) & 1)
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{
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/* modules in an archive file always
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* begin on a word boundary, i.e. at
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* an even address.
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*/
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fseek(curfile, 1L, 1);
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}
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if (read_hdr())
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{ /* read header of next module */
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ptr = ftell(curfile); /* file position */
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file_init(curfile, ARCHIVE, hdr.ar_size);
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/* tell i/o package that we're reading
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* an archive module of given length.
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*/
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if (useful())
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{
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/* re-initialize file, because 'useful'
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* has read some bytes too.
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*/
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fseek(curfile, ptr, 0); /* start module */
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file_init(curfile, ARCHIVE, hdr.ar_size);
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return curfile;
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}
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else
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{
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/* skip this module */
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fseek(curfile,
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ptr + hdr.ar_size, 0);
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}
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}
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else
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{
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/* done with this archive */
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arstate = NO_ARCHIVE;
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}
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}
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else
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{
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/* open next file, close old */
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if (curfile != NULL)
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{
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fclose(curfile);
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}
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argcnt++;
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if (argcnt >= argc)
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{
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/* done with all arguments */
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return NULL;
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}
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filename = argv[argcnt];
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if ((curfile = fopen(filename, "r")) == NULL)
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{
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error("cannot open %s", filename);
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}
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if (is_archive(filename))
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{
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/* ends on '.ma' */
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arstate = ARCHIVE;
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arch_init(curfile); /* read magic ar number */
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}
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else
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{
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file_init(curfile, NO_ARCHIVE, 0L);
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return curfile;
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}
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}
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}
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}
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