166 lines
3.4 KiB
C
166 lines
3.4 KiB
C
/*
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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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* Author: Ceriel J.H. Jacobs
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*/
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/* D E F I N I T I O N M O D U L E S */
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/* $Header$ */
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#include "debug.h"
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#include <assert.h>
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#include <em_arith.h>
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#include <em_label.h>
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#include <alloc.h>
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#include "idf.h"
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#include "input.h"
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#include "scope.h"
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#include "LLlex.h"
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#include "def.h"
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#include "Lpars.h"
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#include "f_info.h"
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#include "main.h"
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#include "node.h"
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#include "type.h"
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#include "misc.h"
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#ifdef DEBUG
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long sys_filesize();
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#endif
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t_idf *DefId;
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char *
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getwdir(fn)
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register char *fn;
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{
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register char *p;
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char *strrindex();
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p = strrindex(fn, '/');
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while (p && *(p + 1) == '\0') { /* remove trailing /'s */
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*p = '\0';
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p = strrindex(fn, '/');
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}
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if (p) {
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*p = '\0';
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fn = Salloc(fn, (unsigned) (p - &fn[0] + 1));
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*p = '/';
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return fn;
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}
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else return ".";
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}
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STATIC
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GetFile(name)
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char *name;
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{
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/* Try to find a file with basename "name" and extension ".def",
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in the directories mentioned in "DEFPATH".
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*/
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char buf[15];
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char *strncpy(), *strcat();
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strncpy(buf, name, 10);
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buf[10] = '\0'; /* maximum length */
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strcat(buf, ".def");
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DEFPATH[0] = WorkingDir;
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if (! InsertFile(buf, DEFPATH, &(FileName))) {
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error("could not find a DEFINITION MODULE for \"%s\"", name);
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return 0;
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}
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WorkingDir = getwdir(FileName);
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LineNumber = 1;
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DO_DEBUG(options['F'], debug("File %s : %ld characters", FileName, sys_filesize(FileName)));
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return 1;
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}
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t_def *
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GetDefinitionModule(id, incr)
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register t_idf *id;
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{
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/* Return a pointer to the "def" structure of the definition
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module indicated by "id".
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We may have to read the definition module itself.
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Also increment level by "incr".
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*/
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register t_def *df;
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static int level;
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t_scopelist *vis;
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char *fn = FileName;
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int ln = LineNumber;
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t_scope *newsc = CurrentScope;
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level += incr;
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df = lookup(id, GlobalScope, 1, 0);
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if (!df) {
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/* Read definition module. Make an exception for SYSTEM.
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*/
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DefId = id;
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if (!strcmp(id->id_text, "SYSTEM")) {
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do_SYSTEM();
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df = lookup(id, GlobalScope, 1, 0);
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}
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else {
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extern int ForeignFlag;
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ForeignFlag = 0;
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open_scope(CLOSEDSCOPE);
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newsc = CurrentScope;
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if (!is_anon_idf(id) && GetFile(id->id_text)) {
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DefModule();
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df = lookup(id, GlobalScope, 1, 0);
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if (level == 1 &&
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(!df || !(df->df_flags & D_FOREIGN))) {
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/* The module is directly imported by
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the currently defined module, and
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is not foreign, so we have to
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remember its name because we have
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to call its initialization routine
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*/
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static t_node *nd_end;
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register t_node *n;
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extern t_node *Modules;
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n = dot2leaf(Name);
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n->nd_IDF = id;
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n->nd_symb = IDENT;
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if (nd_end) nd_end->nd_left = n;
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else Modules = n;
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nd_end = n;
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}
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}
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else {
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df = lookup(id, GlobalScope, 1, 0);
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newsc->sc_name = id->id_text;
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}
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vis = CurrVis;
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close_scope(SC_CHKFORW);
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}
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if (! df) {
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df = MkDef(id, GlobalScope, D_ERROR);
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df->mod_vis = vis;
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newsc->sc_definedby = df;
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}
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}
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else if (df->df_flags & D_BUSY) {
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error("definition module \"%s\" depends on itself",
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id->id_text);
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}
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else if (df == Defined && level == 1) {
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error("cannot import from current module \"%s\"", id->id_text);
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df->df_kind = D_ERROR;
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}
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FileName = fn;
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LineNumber = ln;
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assert(df);
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level -= incr;
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return df;
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}
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